mirror of
https://github.com/autc04/Retro68.git
synced 2024-11-28 21:49:33 +00:00
6672 lines
174 KiB
Go
6672 lines
174 KiB
Go
// Code generated by golang.org/x/tools/cmd/bundle.
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//go:generate bundle -o h2_bundle.go -prefix http2 -import golang.org/x/net/http2/hpack=internal/golang.org/x/net/http2/hpack golang.org/x/net/http2
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// Package http2 implements the HTTP/2 protocol.
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//
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// This package is low-level and intended to be used directly by very
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// few people. Most users will use it indirectly through the automatic
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// use by the net/http package (from Go 1.6 and later).
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// For use in earlier Go versions see ConfigureServer. (Transport support
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// requires Go 1.6 or later)
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//
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// See https://http2.github.io/ for more information on HTTP/2.
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//
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// See https://http2.golang.org/ for a test server running this code.
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//
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package http
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import (
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"bufio"
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"bytes"
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"compress/gzip"
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"crypto/tls"
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"encoding/binary"
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"errors"
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"fmt"
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"internal/golang.org/x/net/http2/hpack"
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"io"
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"io/ioutil"
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"log"
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"net"
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"net/textproto"
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"net/url"
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"os"
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"reflect"
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"runtime"
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"sort"
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"strconv"
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"strings"
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"sync"
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"time"
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)
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// ClientConnPool manages a pool of HTTP/2 client connections.
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type http2ClientConnPool interface {
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GetClientConn(req *Request, addr string) (*http2ClientConn, error)
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MarkDead(*http2ClientConn)
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}
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// TODO: use singleflight for dialing and addConnCalls?
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type http2clientConnPool struct {
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t *http2Transport
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mu sync.Mutex // TODO: maybe switch to RWMutex
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// TODO: add support for sharing conns based on cert names
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// (e.g. share conn for googleapis.com and appspot.com)
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conns map[string][]*http2ClientConn // key is host:port
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dialing map[string]*http2dialCall // currently in-flight dials
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keys map[*http2ClientConn][]string
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addConnCalls map[string]*http2addConnCall // in-flight addConnIfNeede calls
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}
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func (p *http2clientConnPool) GetClientConn(req *Request, addr string) (*http2ClientConn, error) {
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return p.getClientConn(req, addr, http2dialOnMiss)
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}
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const (
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http2dialOnMiss = true
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http2noDialOnMiss = false
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)
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func (p *http2clientConnPool) getClientConn(_ *Request, addr string, dialOnMiss bool) (*http2ClientConn, error) {
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p.mu.Lock()
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for _, cc := range p.conns[addr] {
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if cc.CanTakeNewRequest() {
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p.mu.Unlock()
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return cc, nil
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}
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}
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if !dialOnMiss {
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p.mu.Unlock()
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return nil, http2ErrNoCachedConn
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}
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call := p.getStartDialLocked(addr)
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p.mu.Unlock()
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<-call.done
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return call.res, call.err
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}
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// dialCall is an in-flight Transport dial call to a host.
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type http2dialCall struct {
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p *http2clientConnPool
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done chan struct{} // closed when done
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res *http2ClientConn // valid after done is closed
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err error // valid after done is closed
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}
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// requires p.mu is held.
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func (p *http2clientConnPool) getStartDialLocked(addr string) *http2dialCall {
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if call, ok := p.dialing[addr]; ok {
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return call
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}
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call := &http2dialCall{p: p, done: make(chan struct{})}
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if p.dialing == nil {
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p.dialing = make(map[string]*http2dialCall)
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}
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p.dialing[addr] = call
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go call.dial(addr)
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return call
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}
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// run in its own goroutine.
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func (c *http2dialCall) dial(addr string) {
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c.res, c.err = c.p.t.dialClientConn(addr)
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close(c.done)
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c.p.mu.Lock()
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delete(c.p.dialing, addr)
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if c.err == nil {
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c.p.addConnLocked(addr, c.res)
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}
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c.p.mu.Unlock()
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}
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// addConnIfNeeded makes a NewClientConn out of c if a connection for key doesn't
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// already exist. It coalesces concurrent calls with the same key.
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// This is used by the http1 Transport code when it creates a new connection. Because
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// the http1 Transport doesn't de-dup TCP dials to outbound hosts (because it doesn't know
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// the protocol), it can get into a situation where it has multiple TLS connections.
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// This code decides which ones live or die.
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// The return value used is whether c was used.
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// c is never closed.
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func (p *http2clientConnPool) addConnIfNeeded(key string, t *http2Transport, c *tls.Conn) (used bool, err error) {
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p.mu.Lock()
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for _, cc := range p.conns[key] {
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if cc.CanTakeNewRequest() {
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p.mu.Unlock()
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return false, nil
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}
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}
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call, dup := p.addConnCalls[key]
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if !dup {
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if p.addConnCalls == nil {
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p.addConnCalls = make(map[string]*http2addConnCall)
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}
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call = &http2addConnCall{
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p: p,
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done: make(chan struct{}),
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}
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p.addConnCalls[key] = call
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go call.run(t, key, c)
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}
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p.mu.Unlock()
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<-call.done
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if call.err != nil {
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return false, call.err
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}
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return !dup, nil
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}
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type http2addConnCall struct {
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p *http2clientConnPool
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done chan struct{} // closed when done
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err error
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}
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func (c *http2addConnCall) run(t *http2Transport, key string, tc *tls.Conn) {
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cc, err := t.NewClientConn(tc)
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p := c.p
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p.mu.Lock()
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if err != nil {
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c.err = err
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} else {
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p.addConnLocked(key, cc)
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}
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delete(p.addConnCalls, key)
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p.mu.Unlock()
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close(c.done)
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}
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func (p *http2clientConnPool) addConn(key string, cc *http2ClientConn) {
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p.mu.Lock()
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p.addConnLocked(key, cc)
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p.mu.Unlock()
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}
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// p.mu must be held
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func (p *http2clientConnPool) addConnLocked(key string, cc *http2ClientConn) {
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for _, v := range p.conns[key] {
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if v == cc {
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return
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}
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}
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if p.conns == nil {
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p.conns = make(map[string][]*http2ClientConn)
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}
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if p.keys == nil {
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p.keys = make(map[*http2ClientConn][]string)
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}
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p.conns[key] = append(p.conns[key], cc)
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p.keys[cc] = append(p.keys[cc], key)
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}
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func (p *http2clientConnPool) MarkDead(cc *http2ClientConn) {
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p.mu.Lock()
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defer p.mu.Unlock()
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for _, key := range p.keys[cc] {
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vv, ok := p.conns[key]
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if !ok {
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continue
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}
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newList := http2filterOutClientConn(vv, cc)
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if len(newList) > 0 {
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p.conns[key] = newList
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} else {
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delete(p.conns, key)
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}
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}
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delete(p.keys, cc)
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}
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func (p *http2clientConnPool) closeIdleConnections() {
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p.mu.Lock()
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defer p.mu.Unlock()
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for _, vv := range p.conns {
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for _, cc := range vv {
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cc.closeIfIdle()
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}
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}
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}
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func http2filterOutClientConn(in []*http2ClientConn, exclude *http2ClientConn) []*http2ClientConn {
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out := in[:0]
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for _, v := range in {
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if v != exclude {
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out = append(out, v)
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}
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}
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if len(in) != len(out) {
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in[len(in)-1] = nil
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}
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return out
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}
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func http2configureTransport(t1 *Transport) (*http2Transport, error) {
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connPool := new(http2clientConnPool)
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t2 := &http2Transport{
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ConnPool: http2noDialClientConnPool{connPool},
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t1: t1,
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}
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connPool.t = t2
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if err := http2registerHTTPSProtocol(t1, http2noDialH2RoundTripper{t2}); err != nil {
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return nil, err
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}
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if t1.TLSClientConfig == nil {
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t1.TLSClientConfig = new(tls.Config)
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}
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if !http2strSliceContains(t1.TLSClientConfig.NextProtos, "h2") {
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t1.TLSClientConfig.NextProtos = append([]string{"h2"}, t1.TLSClientConfig.NextProtos...)
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}
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if !http2strSliceContains(t1.TLSClientConfig.NextProtos, "http/1.1") {
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t1.TLSClientConfig.NextProtos = append(t1.TLSClientConfig.NextProtos, "http/1.1")
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}
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upgradeFn := func(authority string, c *tls.Conn) RoundTripper {
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addr := http2authorityAddr(authority)
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if used, err := connPool.addConnIfNeeded(addr, t2, c); err != nil {
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go c.Close()
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return http2erringRoundTripper{err}
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} else if !used {
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go c.Close()
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}
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return t2
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}
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if m := t1.TLSNextProto; len(m) == 0 {
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t1.TLSNextProto = map[string]func(string, *tls.Conn) RoundTripper{
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"h2": upgradeFn,
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}
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} else {
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m["h2"] = upgradeFn
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}
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return t2, nil
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}
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// registerHTTPSProtocol calls Transport.RegisterProtocol but
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// convering panics into errors.
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func http2registerHTTPSProtocol(t *Transport, rt RoundTripper) (err error) {
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defer func() {
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if e := recover(); e != nil {
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err = fmt.Errorf("%v", e)
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}
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}()
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t.RegisterProtocol("https", rt)
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return nil
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}
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// noDialClientConnPool is an implementation of http2.ClientConnPool
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// which never dials. We let the HTTP/1.1 client dial and use its TLS
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// connection instead.
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type http2noDialClientConnPool struct{ *http2clientConnPool }
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func (p http2noDialClientConnPool) GetClientConn(req *Request, addr string) (*http2ClientConn, error) {
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return p.getClientConn(req, addr, http2noDialOnMiss)
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}
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// noDialH2RoundTripper is a RoundTripper which only tries to complete the request
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// if there's already has a cached connection to the host.
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type http2noDialH2RoundTripper struct{ t *http2Transport }
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func (rt http2noDialH2RoundTripper) RoundTrip(req *Request) (*Response, error) {
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res, err := rt.t.RoundTrip(req)
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if err == http2ErrNoCachedConn {
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return nil, ErrSkipAltProtocol
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}
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return res, err
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}
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// An ErrCode is an unsigned 32-bit error code as defined in the HTTP/2 spec.
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type http2ErrCode uint32
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const (
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http2ErrCodeNo http2ErrCode = 0x0
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http2ErrCodeProtocol http2ErrCode = 0x1
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http2ErrCodeInternal http2ErrCode = 0x2
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http2ErrCodeFlowControl http2ErrCode = 0x3
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http2ErrCodeSettingsTimeout http2ErrCode = 0x4
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http2ErrCodeStreamClosed http2ErrCode = 0x5
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http2ErrCodeFrameSize http2ErrCode = 0x6
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http2ErrCodeRefusedStream http2ErrCode = 0x7
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http2ErrCodeCancel http2ErrCode = 0x8
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http2ErrCodeCompression http2ErrCode = 0x9
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http2ErrCodeConnect http2ErrCode = 0xa
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http2ErrCodeEnhanceYourCalm http2ErrCode = 0xb
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http2ErrCodeInadequateSecurity http2ErrCode = 0xc
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http2ErrCodeHTTP11Required http2ErrCode = 0xd
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)
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var http2errCodeName = map[http2ErrCode]string{
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http2ErrCodeNo: "NO_ERROR",
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http2ErrCodeProtocol: "PROTOCOL_ERROR",
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http2ErrCodeInternal: "INTERNAL_ERROR",
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http2ErrCodeFlowControl: "FLOW_CONTROL_ERROR",
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http2ErrCodeSettingsTimeout: "SETTINGS_TIMEOUT",
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http2ErrCodeStreamClosed: "STREAM_CLOSED",
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http2ErrCodeFrameSize: "FRAME_SIZE_ERROR",
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http2ErrCodeRefusedStream: "REFUSED_STREAM",
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http2ErrCodeCancel: "CANCEL",
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http2ErrCodeCompression: "COMPRESSION_ERROR",
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http2ErrCodeConnect: "CONNECT_ERROR",
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http2ErrCodeEnhanceYourCalm: "ENHANCE_YOUR_CALM",
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http2ErrCodeInadequateSecurity: "INADEQUATE_SECURITY",
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http2ErrCodeHTTP11Required: "HTTP_1_1_REQUIRED",
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}
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func (e http2ErrCode) String() string {
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if s, ok := http2errCodeName[e]; ok {
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return s
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}
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return fmt.Sprintf("unknown error code 0x%x", uint32(e))
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}
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// ConnectionError is an error that results in the termination of the
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// entire connection.
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type http2ConnectionError http2ErrCode
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func (e http2ConnectionError) Error() string {
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return fmt.Sprintf("connection error: %s", http2ErrCode(e))
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}
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// StreamError is an error that only affects one stream within an
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// HTTP/2 connection.
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type http2StreamError struct {
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StreamID uint32
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Code http2ErrCode
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}
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func (e http2StreamError) Error() string {
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return fmt.Sprintf("stream error: stream ID %d; %v", e.StreamID, e.Code)
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}
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// 6.9.1 The Flow Control Window
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// "If a sender receives a WINDOW_UPDATE that causes a flow control
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// window to exceed this maximum it MUST terminate either the stream
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// or the connection, as appropriate. For streams, [...]; for the
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// connection, a GOAWAY frame with a FLOW_CONTROL_ERROR code."
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type http2goAwayFlowError struct{}
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func (http2goAwayFlowError) Error() string { return "connection exceeded flow control window size" }
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// Errors of this type are only returned by the frame parser functions
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// and converted into ConnectionError(ErrCodeProtocol).
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type http2connError struct {
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Code http2ErrCode
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Reason string
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}
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func (e http2connError) Error() string {
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return fmt.Sprintf("http2: connection error: %v: %v", e.Code, e.Reason)
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}
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// fixedBuffer is an io.ReadWriter backed by a fixed size buffer.
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// It never allocates, but moves old data as new data is written.
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type http2fixedBuffer struct {
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buf []byte
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r, w int
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}
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var (
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http2errReadEmpty = errors.New("read from empty fixedBuffer")
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http2errWriteFull = errors.New("write on full fixedBuffer")
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)
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// Read copies bytes from the buffer into p.
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// It is an error to read when no data is available.
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func (b *http2fixedBuffer) Read(p []byte) (n int, err error) {
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if b.r == b.w {
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return 0, http2errReadEmpty
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}
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n = copy(p, b.buf[b.r:b.w])
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b.r += n
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if b.r == b.w {
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b.r = 0
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b.w = 0
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}
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return n, nil
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}
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// Len returns the number of bytes of the unread portion of the buffer.
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func (b *http2fixedBuffer) Len() int {
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return b.w - b.r
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}
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// Write copies bytes from p into the buffer.
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// It is an error to write more data than the buffer can hold.
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func (b *http2fixedBuffer) Write(p []byte) (n int, err error) {
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if b.r > 0 && len(p) > len(b.buf)-b.w {
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copy(b.buf, b.buf[b.r:b.w])
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b.w -= b.r
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b.r = 0
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}
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n = copy(b.buf[b.w:], p)
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b.w += n
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if n < len(p) {
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err = http2errWriteFull
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}
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return n, err
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}
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// flow is the flow control window's size.
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type http2flow struct {
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// n is the number of DATA bytes we're allowed to send.
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// A flow is kept both on a conn and a per-stream.
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n int32
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// conn points to the shared connection-level flow that is
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// shared by all streams on that conn. It is nil for the flow
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// that's on the conn directly.
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conn *http2flow
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}
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func (f *http2flow) setConnFlow(cf *http2flow) { f.conn = cf }
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func (f *http2flow) available() int32 {
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n := f.n
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if f.conn != nil && f.conn.n < n {
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n = f.conn.n
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}
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return n
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}
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func (f *http2flow) take(n int32) {
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if n > f.available() {
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panic("internal error: took too much")
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}
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f.n -= n
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if f.conn != nil {
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f.conn.n -= n
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}
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}
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|
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// add adds n bytes (positive or negative) to the flow control window.
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// It returns false if the sum would exceed 2^31-1.
|
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func (f *http2flow) add(n int32) bool {
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remain := (1<<31 - 1) - f.n
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if n > remain {
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return false
|
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}
|
|
f.n += n
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return true
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}
|
|
|
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const http2frameHeaderLen = 9
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|
|
var http2padZeros = make([]byte, 255) // zeros for padding
|
|
|
|
// A FrameType is a registered frame type as defined in
|
|
// http://http2.github.io/http2-spec/#rfc.section.11.2
|
|
type http2FrameType uint8
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|
|
|
const (
|
|
http2FrameData http2FrameType = 0x0
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|
http2FrameHeaders http2FrameType = 0x1
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|
http2FramePriority http2FrameType = 0x2
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|
http2FrameRSTStream http2FrameType = 0x3
|
|
http2FrameSettings http2FrameType = 0x4
|
|
http2FramePushPromise http2FrameType = 0x5
|
|
http2FramePing http2FrameType = 0x6
|
|
http2FrameGoAway http2FrameType = 0x7
|
|
http2FrameWindowUpdate http2FrameType = 0x8
|
|
http2FrameContinuation http2FrameType = 0x9
|
|
)
|
|
|
|
var http2frameName = map[http2FrameType]string{
|
|
http2FrameData: "DATA",
|
|
http2FrameHeaders: "HEADERS",
|
|
http2FramePriority: "PRIORITY",
|
|
http2FrameRSTStream: "RST_STREAM",
|
|
http2FrameSettings: "SETTINGS",
|
|
http2FramePushPromise: "PUSH_PROMISE",
|
|
http2FramePing: "PING",
|
|
http2FrameGoAway: "GOAWAY",
|
|
http2FrameWindowUpdate: "WINDOW_UPDATE",
|
|
http2FrameContinuation: "CONTINUATION",
|
|
}
|
|
|
|
func (t http2FrameType) String() string {
|
|
if s, ok := http2frameName[t]; ok {
|
|
return s
|
|
}
|
|
return fmt.Sprintf("UNKNOWN_FRAME_TYPE_%d", uint8(t))
|
|
}
|
|
|
|
// Flags is a bitmask of HTTP/2 flags.
|
|
// The meaning of flags varies depending on the frame type.
|
|
type http2Flags uint8
|
|
|
|
// Has reports whether f contains all (0 or more) flags in v.
|
|
func (f http2Flags) Has(v http2Flags) bool {
|
|
return (f & v) == v
|
|
}
|
|
|
|
// Frame-specific FrameHeader flag bits.
|
|
const (
|
|
// Data Frame
|
|
http2FlagDataEndStream http2Flags = 0x1
|
|
http2FlagDataPadded http2Flags = 0x8
|
|
|
|
// Headers Frame
|
|
http2FlagHeadersEndStream http2Flags = 0x1
|
|
http2FlagHeadersEndHeaders http2Flags = 0x4
|
|
http2FlagHeadersPadded http2Flags = 0x8
|
|
http2FlagHeadersPriority http2Flags = 0x20
|
|
|
|
// Settings Frame
|
|
http2FlagSettingsAck http2Flags = 0x1
|
|
|
|
// Ping Frame
|
|
http2FlagPingAck http2Flags = 0x1
|
|
|
|
// Continuation Frame
|
|
http2FlagContinuationEndHeaders http2Flags = 0x4
|
|
|
|
http2FlagPushPromiseEndHeaders http2Flags = 0x4
|
|
http2FlagPushPromisePadded http2Flags = 0x8
|
|
)
|
|
|
|
var http2flagName = map[http2FrameType]map[http2Flags]string{
|
|
http2FrameData: {
|
|
http2FlagDataEndStream: "END_STREAM",
|
|
http2FlagDataPadded: "PADDED",
|
|
},
|
|
http2FrameHeaders: {
|
|
http2FlagHeadersEndStream: "END_STREAM",
|
|
http2FlagHeadersEndHeaders: "END_HEADERS",
|
|
http2FlagHeadersPadded: "PADDED",
|
|
http2FlagHeadersPriority: "PRIORITY",
|
|
},
|
|
http2FrameSettings: {
|
|
http2FlagSettingsAck: "ACK",
|
|
},
|
|
http2FramePing: {
|
|
http2FlagPingAck: "ACK",
|
|
},
|
|
http2FrameContinuation: {
|
|
http2FlagContinuationEndHeaders: "END_HEADERS",
|
|
},
|
|
http2FramePushPromise: {
|
|
http2FlagPushPromiseEndHeaders: "END_HEADERS",
|
|
http2FlagPushPromisePadded: "PADDED",
|
|
},
|
|
}
|
|
|
|
// a frameParser parses a frame given its FrameHeader and payload
|
|
// bytes. The length of payload will always equal fh.Length (which
|
|
// might be 0).
|
|
type http2frameParser func(fh http2FrameHeader, payload []byte) (http2Frame, error)
|
|
|
|
var http2frameParsers = map[http2FrameType]http2frameParser{
|
|
http2FrameData: http2parseDataFrame,
|
|
http2FrameHeaders: http2parseHeadersFrame,
|
|
http2FramePriority: http2parsePriorityFrame,
|
|
http2FrameRSTStream: http2parseRSTStreamFrame,
|
|
http2FrameSettings: http2parseSettingsFrame,
|
|
http2FramePushPromise: http2parsePushPromise,
|
|
http2FramePing: http2parsePingFrame,
|
|
http2FrameGoAway: http2parseGoAwayFrame,
|
|
http2FrameWindowUpdate: http2parseWindowUpdateFrame,
|
|
http2FrameContinuation: http2parseContinuationFrame,
|
|
}
|
|
|
|
func http2typeFrameParser(t http2FrameType) http2frameParser {
|
|
if f := http2frameParsers[t]; f != nil {
|
|
return f
|
|
}
|
|
return http2parseUnknownFrame
|
|
}
|
|
|
|
// A FrameHeader is the 9 byte header of all HTTP/2 frames.
|
|
//
|
|
// See http://http2.github.io/http2-spec/#FrameHeader
|
|
type http2FrameHeader struct {
|
|
valid bool // caller can access []byte fields in the Frame
|
|
|
|
// Type is the 1 byte frame type. There are ten standard frame
|
|
// types, but extension frame types may be written by WriteRawFrame
|
|
// and will be returned by ReadFrame (as UnknownFrame).
|
|
Type http2FrameType
|
|
|
|
// Flags are the 1 byte of 8 potential bit flags per frame.
|
|
// They are specific to the frame type.
|
|
Flags http2Flags
|
|
|
|
// Length is the length of the frame, not including the 9 byte header.
|
|
// The maximum size is one byte less than 16MB (uint24), but only
|
|
// frames up to 16KB are allowed without peer agreement.
|
|
Length uint32
|
|
|
|
// StreamID is which stream this frame is for. Certain frames
|
|
// are not stream-specific, in which case this field is 0.
|
|
StreamID uint32
|
|
}
|
|
|
|
// Header returns h. It exists so FrameHeaders can be embedded in other
|
|
// specific frame types and implement the Frame interface.
|
|
func (h http2FrameHeader) Header() http2FrameHeader { return h }
|
|
|
|
func (h http2FrameHeader) String() string {
|
|
var buf bytes.Buffer
|
|
buf.WriteString("[FrameHeader ")
|
|
h.writeDebug(&buf)
|
|
buf.WriteByte(']')
|
|
return buf.String()
|
|
}
|
|
|
|
func (h http2FrameHeader) writeDebug(buf *bytes.Buffer) {
|
|
buf.WriteString(h.Type.String())
|
|
if h.Flags != 0 {
|
|
buf.WriteString(" flags=")
|
|
set := 0
|
|
for i := uint8(0); i < 8; i++ {
|
|
if h.Flags&(1<<i) == 0 {
|
|
continue
|
|
}
|
|
set++
|
|
if set > 1 {
|
|
buf.WriteByte('|')
|
|
}
|
|
name := http2flagName[h.Type][http2Flags(1<<i)]
|
|
if name != "" {
|
|
buf.WriteString(name)
|
|
} else {
|
|
fmt.Fprintf(buf, "0x%x", 1<<i)
|
|
}
|
|
}
|
|
}
|
|
if h.StreamID != 0 {
|
|
fmt.Fprintf(buf, " stream=%d", h.StreamID)
|
|
}
|
|
fmt.Fprintf(buf, " len=%d", h.Length)
|
|
}
|
|
|
|
func (h *http2FrameHeader) checkValid() {
|
|
if !h.valid {
|
|
panic("Frame accessor called on non-owned Frame")
|
|
}
|
|
}
|
|
|
|
func (h *http2FrameHeader) invalidate() { h.valid = false }
|
|
|
|
// frame header bytes.
|
|
// Used only by ReadFrameHeader.
|
|
var http2fhBytes = sync.Pool{
|
|
New: func() interface{} {
|
|
buf := make([]byte, http2frameHeaderLen)
|
|
return &buf
|
|
},
|
|
}
|
|
|
|
// ReadFrameHeader reads 9 bytes from r and returns a FrameHeader.
|
|
// Most users should use Framer.ReadFrame instead.
|
|
func http2ReadFrameHeader(r io.Reader) (http2FrameHeader, error) {
|
|
bufp := http2fhBytes.Get().(*[]byte)
|
|
defer http2fhBytes.Put(bufp)
|
|
return http2readFrameHeader(*bufp, r)
|
|
}
|
|
|
|
func http2readFrameHeader(buf []byte, r io.Reader) (http2FrameHeader, error) {
|
|
_, err := io.ReadFull(r, buf[:http2frameHeaderLen])
|
|
if err != nil {
|
|
return http2FrameHeader{}, err
|
|
}
|
|
return http2FrameHeader{
|
|
Length: (uint32(buf[0])<<16 | uint32(buf[1])<<8 | uint32(buf[2])),
|
|
Type: http2FrameType(buf[3]),
|
|
Flags: http2Flags(buf[4]),
|
|
StreamID: binary.BigEndian.Uint32(buf[5:]) & (1<<31 - 1),
|
|
valid: true,
|
|
}, nil
|
|
}
|
|
|
|
// A Frame is the base interface implemented by all frame types.
|
|
// Callers will generally type-assert the specific frame type:
|
|
// *HeadersFrame, *SettingsFrame, *WindowUpdateFrame, etc.
|
|
//
|
|
// Frames are only valid until the next call to Framer.ReadFrame.
|
|
type http2Frame interface {
|
|
Header() http2FrameHeader
|
|
|
|
// invalidate is called by Framer.ReadFrame to make this
|
|
// frame's buffers as being invalid, since the subsequent
|
|
// frame will reuse them.
|
|
invalidate()
|
|
}
|
|
|
|
// A Framer reads and writes Frames.
|
|
type http2Framer struct {
|
|
r io.Reader
|
|
lastFrame http2Frame
|
|
errReason string
|
|
|
|
// lastHeaderStream is non-zero if the last frame was an
|
|
// unfinished HEADERS/CONTINUATION.
|
|
lastHeaderStream uint32
|
|
|
|
maxReadSize uint32
|
|
headerBuf [http2frameHeaderLen]byte
|
|
|
|
// TODO: let getReadBuf be configurable, and use a less memory-pinning
|
|
// allocator in server.go to minimize memory pinned for many idle conns.
|
|
// Will probably also need to make frame invalidation have a hook too.
|
|
getReadBuf func(size uint32) []byte
|
|
readBuf []byte // cache for default getReadBuf
|
|
|
|
maxWriteSize uint32 // zero means unlimited; TODO: implement
|
|
|
|
w io.Writer
|
|
wbuf []byte
|
|
|
|
// AllowIllegalWrites permits the Framer's Write methods to
|
|
// write frames that do not conform to the HTTP/2 spec. This
|
|
// permits using the Framer to test other HTTP/2
|
|
// implementations' conformance to the spec.
|
|
// If false, the Write methods will prefer to return an error
|
|
// rather than comply.
|
|
AllowIllegalWrites bool
|
|
|
|
// AllowIllegalReads permits the Framer's ReadFrame method
|
|
// to return non-compliant frames or frame orders.
|
|
// This is for testing and permits using the Framer to test
|
|
// other HTTP/2 implementations' conformance to the spec.
|
|
AllowIllegalReads bool
|
|
|
|
logReads bool
|
|
|
|
debugFramer *http2Framer // only use for logging written writes
|
|
debugFramerBuf *bytes.Buffer
|
|
}
|
|
|
|
func (f *http2Framer) startWrite(ftype http2FrameType, flags http2Flags, streamID uint32) {
|
|
|
|
f.wbuf = append(f.wbuf[:0],
|
|
0,
|
|
0,
|
|
0,
|
|
byte(ftype),
|
|
byte(flags),
|
|
byte(streamID>>24),
|
|
byte(streamID>>16),
|
|
byte(streamID>>8),
|
|
byte(streamID))
|
|
}
|
|
|
|
func (f *http2Framer) endWrite() error {
|
|
|
|
length := len(f.wbuf) - http2frameHeaderLen
|
|
if length >= (1 << 24) {
|
|
return http2ErrFrameTooLarge
|
|
}
|
|
_ = append(f.wbuf[:0],
|
|
byte(length>>16),
|
|
byte(length>>8),
|
|
byte(length))
|
|
if http2logFrameWrites {
|
|
f.logWrite()
|
|
}
|
|
|
|
n, err := f.w.Write(f.wbuf)
|
|
if err == nil && n != len(f.wbuf) {
|
|
err = io.ErrShortWrite
|
|
}
|
|
return err
|
|
}
|
|
|
|
func (f *http2Framer) logWrite() {
|
|
if f.debugFramer == nil {
|
|
f.debugFramerBuf = new(bytes.Buffer)
|
|
f.debugFramer = http2NewFramer(nil, f.debugFramerBuf)
|
|
f.debugFramer.logReads = false
|
|
|
|
f.debugFramer.AllowIllegalReads = true
|
|
}
|
|
f.debugFramerBuf.Write(f.wbuf)
|
|
fr, err := f.debugFramer.ReadFrame()
|
|
if err != nil {
|
|
log.Printf("http2: Framer %p: failed to decode just-written frame", f)
|
|
return
|
|
}
|
|
log.Printf("http2: Framer %p: wrote %v", f, http2summarizeFrame(fr))
|
|
}
|
|
|
|
func (f *http2Framer) writeByte(v byte) { f.wbuf = append(f.wbuf, v) }
|
|
|
|
func (f *http2Framer) writeBytes(v []byte) { f.wbuf = append(f.wbuf, v...) }
|
|
|
|
func (f *http2Framer) writeUint16(v uint16) { f.wbuf = append(f.wbuf, byte(v>>8), byte(v)) }
|
|
|
|
func (f *http2Framer) writeUint32(v uint32) {
|
|
f.wbuf = append(f.wbuf, byte(v>>24), byte(v>>16), byte(v>>8), byte(v))
|
|
}
|
|
|
|
const (
|
|
http2minMaxFrameSize = 1 << 14
|
|
http2maxFrameSize = 1<<24 - 1
|
|
)
|
|
|
|
// NewFramer returns a Framer that writes frames to w and reads them from r.
|
|
func http2NewFramer(w io.Writer, r io.Reader) *http2Framer {
|
|
fr := &http2Framer{
|
|
w: w,
|
|
r: r,
|
|
logReads: http2logFrameReads,
|
|
}
|
|
fr.getReadBuf = func(size uint32) []byte {
|
|
if cap(fr.readBuf) >= int(size) {
|
|
return fr.readBuf[:size]
|
|
}
|
|
fr.readBuf = make([]byte, size)
|
|
return fr.readBuf
|
|
}
|
|
fr.SetMaxReadFrameSize(http2maxFrameSize)
|
|
return fr
|
|
}
|
|
|
|
// SetMaxReadFrameSize sets the maximum size of a frame
|
|
// that will be read by a subsequent call to ReadFrame.
|
|
// It is the caller's responsibility to advertise this
|
|
// limit with a SETTINGS frame.
|
|
func (fr *http2Framer) SetMaxReadFrameSize(v uint32) {
|
|
if v > http2maxFrameSize {
|
|
v = http2maxFrameSize
|
|
}
|
|
fr.maxReadSize = v
|
|
}
|
|
|
|
// ErrFrameTooLarge is returned from Framer.ReadFrame when the peer
|
|
// sends a frame that is larger than declared with SetMaxReadFrameSize.
|
|
var http2ErrFrameTooLarge = errors.New("http2: frame too large")
|
|
|
|
// terminalReadFrameError reports whether err is an unrecoverable
|
|
// error from ReadFrame and no other frames should be read.
|
|
func http2terminalReadFrameError(err error) bool {
|
|
if _, ok := err.(http2StreamError); ok {
|
|
return false
|
|
}
|
|
return err != nil
|
|
}
|
|
|
|
// ReadFrame reads a single frame. The returned Frame is only valid
|
|
// until the next call to ReadFrame.
|
|
//
|
|
// If the frame is larger than previously set with SetMaxReadFrameSize, the
|
|
// returned error is ErrFrameTooLarge. Other errors may be of type
|
|
// ConnectionError, StreamError, or anything else from from the underlying
|
|
// reader.
|
|
func (fr *http2Framer) ReadFrame() (http2Frame, error) {
|
|
if fr.lastFrame != nil {
|
|
fr.lastFrame.invalidate()
|
|
}
|
|
fh, err := http2readFrameHeader(fr.headerBuf[:], fr.r)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
if fh.Length > fr.maxReadSize {
|
|
return nil, http2ErrFrameTooLarge
|
|
}
|
|
payload := fr.getReadBuf(fh.Length)
|
|
if _, err := io.ReadFull(fr.r, payload); err != nil {
|
|
return nil, err
|
|
}
|
|
f, err := http2typeFrameParser(fh.Type)(fh, payload)
|
|
if err != nil {
|
|
if ce, ok := err.(http2connError); ok {
|
|
return nil, fr.connError(ce.Code, ce.Reason)
|
|
}
|
|
return nil, err
|
|
}
|
|
if err := fr.checkFrameOrder(f); err != nil {
|
|
return nil, err
|
|
}
|
|
if fr.logReads {
|
|
log.Printf("http2: Framer %p: read %v", fr, http2summarizeFrame(f))
|
|
}
|
|
return f, nil
|
|
}
|
|
|
|
// connError returns ConnectionError(code) but first
|
|
// stashes away a public reason to the caller can optionally relay it
|
|
// to the peer before hanging up on them. This might help others debug
|
|
// their implementations.
|
|
func (fr *http2Framer) connError(code http2ErrCode, reason string) error {
|
|
fr.errReason = reason
|
|
return http2ConnectionError(code)
|
|
}
|
|
|
|
// checkFrameOrder reports an error if f is an invalid frame to return
|
|
// next from ReadFrame. Mostly it checks whether HEADERS and
|
|
// CONTINUATION frames are contiguous.
|
|
func (fr *http2Framer) checkFrameOrder(f http2Frame) error {
|
|
last := fr.lastFrame
|
|
fr.lastFrame = f
|
|
if fr.AllowIllegalReads {
|
|
return nil
|
|
}
|
|
|
|
fh := f.Header()
|
|
if fr.lastHeaderStream != 0 {
|
|
if fh.Type != http2FrameContinuation {
|
|
return fr.connError(http2ErrCodeProtocol,
|
|
fmt.Sprintf("got %s for stream %d; expected CONTINUATION following %s for stream %d",
|
|
fh.Type, fh.StreamID,
|
|
last.Header().Type, fr.lastHeaderStream))
|
|
}
|
|
if fh.StreamID != fr.lastHeaderStream {
|
|
return fr.connError(http2ErrCodeProtocol,
|
|
fmt.Sprintf("got CONTINUATION for stream %d; expected stream %d",
|
|
fh.StreamID, fr.lastHeaderStream))
|
|
}
|
|
} else if fh.Type == http2FrameContinuation {
|
|
return fr.connError(http2ErrCodeProtocol, fmt.Sprintf("unexpected CONTINUATION for stream %d", fh.StreamID))
|
|
}
|
|
|
|
switch fh.Type {
|
|
case http2FrameHeaders, http2FrameContinuation:
|
|
if fh.Flags.Has(http2FlagHeadersEndHeaders) {
|
|
fr.lastHeaderStream = 0
|
|
} else {
|
|
fr.lastHeaderStream = fh.StreamID
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// A DataFrame conveys arbitrary, variable-length sequences of octets
|
|
// associated with a stream.
|
|
// See http://http2.github.io/http2-spec/#rfc.section.6.1
|
|
type http2DataFrame struct {
|
|
http2FrameHeader
|
|
data []byte
|
|
}
|
|
|
|
func (f *http2DataFrame) StreamEnded() bool {
|
|
return f.http2FrameHeader.Flags.Has(http2FlagDataEndStream)
|
|
}
|
|
|
|
// Data returns the frame's data octets, not including any padding
|
|
// size byte or padding suffix bytes.
|
|
// The caller must not retain the returned memory past the next
|
|
// call to ReadFrame.
|
|
func (f *http2DataFrame) Data() []byte {
|
|
f.checkValid()
|
|
return f.data
|
|
}
|
|
|
|
func http2parseDataFrame(fh http2FrameHeader, payload []byte) (http2Frame, error) {
|
|
if fh.StreamID == 0 {
|
|
|
|
return nil, http2connError{http2ErrCodeProtocol, "DATA frame with stream ID 0"}
|
|
}
|
|
f := &http2DataFrame{
|
|
http2FrameHeader: fh,
|
|
}
|
|
var padSize byte
|
|
if fh.Flags.Has(http2FlagDataPadded) {
|
|
var err error
|
|
payload, padSize, err = http2readByte(payload)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
if int(padSize) > len(payload) {
|
|
|
|
return nil, http2connError{http2ErrCodeProtocol, "pad size larger than data payload"}
|
|
}
|
|
f.data = payload[:len(payload)-int(padSize)]
|
|
return f, nil
|
|
}
|
|
|
|
var http2errStreamID = errors.New("invalid streamid")
|
|
|
|
func http2validStreamID(streamID uint32) bool {
|
|
return streamID != 0 && streamID&(1<<31) == 0
|
|
}
|
|
|
|
// WriteData writes a DATA frame.
|
|
//
|
|
// It will perform exactly one Write to the underlying Writer.
|
|
// It is the caller's responsibility to not call other Write methods concurrently.
|
|
func (f *http2Framer) WriteData(streamID uint32, endStream bool, data []byte) error {
|
|
|
|
if !http2validStreamID(streamID) && !f.AllowIllegalWrites {
|
|
return http2errStreamID
|
|
}
|
|
var flags http2Flags
|
|
if endStream {
|
|
flags |= http2FlagDataEndStream
|
|
}
|
|
f.startWrite(http2FrameData, flags, streamID)
|
|
f.wbuf = append(f.wbuf, data...)
|
|
return f.endWrite()
|
|
}
|
|
|
|
// A SettingsFrame conveys configuration parameters that affect how
|
|
// endpoints communicate, such as preferences and constraints on peer
|
|
// behavior.
|
|
//
|
|
// See http://http2.github.io/http2-spec/#SETTINGS
|
|
type http2SettingsFrame struct {
|
|
http2FrameHeader
|
|
p []byte
|
|
}
|
|
|
|
func http2parseSettingsFrame(fh http2FrameHeader, p []byte) (http2Frame, error) {
|
|
if fh.Flags.Has(http2FlagSettingsAck) && fh.Length > 0 {
|
|
|
|
return nil, http2ConnectionError(http2ErrCodeFrameSize)
|
|
}
|
|
if fh.StreamID != 0 {
|
|
|
|
return nil, http2ConnectionError(http2ErrCodeProtocol)
|
|
}
|
|
if len(p)%6 != 0 {
|
|
|
|
return nil, http2ConnectionError(http2ErrCodeFrameSize)
|
|
}
|
|
f := &http2SettingsFrame{http2FrameHeader: fh, p: p}
|
|
if v, ok := f.Value(http2SettingInitialWindowSize); ok && v > (1<<31)-1 {
|
|
|
|
return nil, http2ConnectionError(http2ErrCodeFlowControl)
|
|
}
|
|
return f, nil
|
|
}
|
|
|
|
func (f *http2SettingsFrame) IsAck() bool {
|
|
return f.http2FrameHeader.Flags.Has(http2FlagSettingsAck)
|
|
}
|
|
|
|
func (f *http2SettingsFrame) Value(s http2SettingID) (v uint32, ok bool) {
|
|
f.checkValid()
|
|
buf := f.p
|
|
for len(buf) > 0 {
|
|
settingID := http2SettingID(binary.BigEndian.Uint16(buf[:2]))
|
|
if settingID == s {
|
|
return binary.BigEndian.Uint32(buf[2:6]), true
|
|
}
|
|
buf = buf[6:]
|
|
}
|
|
return 0, false
|
|
}
|
|
|
|
// ForeachSetting runs fn for each setting.
|
|
// It stops and returns the first error.
|
|
func (f *http2SettingsFrame) ForeachSetting(fn func(http2Setting) error) error {
|
|
f.checkValid()
|
|
buf := f.p
|
|
for len(buf) > 0 {
|
|
if err := fn(http2Setting{
|
|
http2SettingID(binary.BigEndian.Uint16(buf[:2])),
|
|
binary.BigEndian.Uint32(buf[2:6]),
|
|
}); err != nil {
|
|
return err
|
|
}
|
|
buf = buf[6:]
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// WriteSettings writes a SETTINGS frame with zero or more settings
|
|
// specified and the ACK bit not set.
|
|
//
|
|
// It will perform exactly one Write to the underlying Writer.
|
|
// It is the caller's responsibility to not call other Write methods concurrently.
|
|
func (f *http2Framer) WriteSettings(settings ...http2Setting) error {
|
|
f.startWrite(http2FrameSettings, 0, 0)
|
|
for _, s := range settings {
|
|
f.writeUint16(uint16(s.ID))
|
|
f.writeUint32(s.Val)
|
|
}
|
|
return f.endWrite()
|
|
}
|
|
|
|
// WriteSettings writes an empty SETTINGS frame with the ACK bit set.
|
|
//
|
|
// It will perform exactly one Write to the underlying Writer.
|
|
// It is the caller's responsibility to not call other Write methods concurrently.
|
|
func (f *http2Framer) WriteSettingsAck() error {
|
|
f.startWrite(http2FrameSettings, http2FlagSettingsAck, 0)
|
|
return f.endWrite()
|
|
}
|
|
|
|
// A PingFrame is a mechanism for measuring a minimal round trip time
|
|
// from the sender, as well as determining whether an idle connection
|
|
// is still functional.
|
|
// See http://http2.github.io/http2-spec/#rfc.section.6.7
|
|
type http2PingFrame struct {
|
|
http2FrameHeader
|
|
Data [8]byte
|
|
}
|
|
|
|
func (f *http2PingFrame) IsAck() bool { return f.Flags.Has(http2FlagPingAck) }
|
|
|
|
func http2parsePingFrame(fh http2FrameHeader, payload []byte) (http2Frame, error) {
|
|
if len(payload) != 8 {
|
|
return nil, http2ConnectionError(http2ErrCodeFrameSize)
|
|
}
|
|
if fh.StreamID != 0 {
|
|
return nil, http2ConnectionError(http2ErrCodeProtocol)
|
|
}
|
|
f := &http2PingFrame{http2FrameHeader: fh}
|
|
copy(f.Data[:], payload)
|
|
return f, nil
|
|
}
|
|
|
|
func (f *http2Framer) WritePing(ack bool, data [8]byte) error {
|
|
var flags http2Flags
|
|
if ack {
|
|
flags = http2FlagPingAck
|
|
}
|
|
f.startWrite(http2FramePing, flags, 0)
|
|
f.writeBytes(data[:])
|
|
return f.endWrite()
|
|
}
|
|
|
|
// A GoAwayFrame informs the remote peer to stop creating streams on this connection.
|
|
// See http://http2.github.io/http2-spec/#rfc.section.6.8
|
|
type http2GoAwayFrame struct {
|
|
http2FrameHeader
|
|
LastStreamID uint32
|
|
ErrCode http2ErrCode
|
|
debugData []byte
|
|
}
|
|
|
|
// DebugData returns any debug data in the GOAWAY frame. Its contents
|
|
// are not defined.
|
|
// The caller must not retain the returned memory past the next
|
|
// call to ReadFrame.
|
|
func (f *http2GoAwayFrame) DebugData() []byte {
|
|
f.checkValid()
|
|
return f.debugData
|
|
}
|
|
|
|
func http2parseGoAwayFrame(fh http2FrameHeader, p []byte) (http2Frame, error) {
|
|
if fh.StreamID != 0 {
|
|
return nil, http2ConnectionError(http2ErrCodeProtocol)
|
|
}
|
|
if len(p) < 8 {
|
|
return nil, http2ConnectionError(http2ErrCodeFrameSize)
|
|
}
|
|
return &http2GoAwayFrame{
|
|
http2FrameHeader: fh,
|
|
LastStreamID: binary.BigEndian.Uint32(p[:4]) & (1<<31 - 1),
|
|
ErrCode: http2ErrCode(binary.BigEndian.Uint32(p[4:8])),
|
|
debugData: p[8:],
|
|
}, nil
|
|
}
|
|
|
|
func (f *http2Framer) WriteGoAway(maxStreamID uint32, code http2ErrCode, debugData []byte) error {
|
|
f.startWrite(http2FrameGoAway, 0, 0)
|
|
f.writeUint32(maxStreamID & (1<<31 - 1))
|
|
f.writeUint32(uint32(code))
|
|
f.writeBytes(debugData)
|
|
return f.endWrite()
|
|
}
|
|
|
|
// An UnknownFrame is the frame type returned when the frame type is unknown
|
|
// or no specific frame type parser exists.
|
|
type http2UnknownFrame struct {
|
|
http2FrameHeader
|
|
p []byte
|
|
}
|
|
|
|
// Payload returns the frame's payload (after the header). It is not
|
|
// valid to call this method after a subsequent call to
|
|
// Framer.ReadFrame, nor is it valid to retain the returned slice.
|
|
// The memory is owned by the Framer and is invalidated when the next
|
|
// frame is read.
|
|
func (f *http2UnknownFrame) Payload() []byte {
|
|
f.checkValid()
|
|
return f.p
|
|
}
|
|
|
|
func http2parseUnknownFrame(fh http2FrameHeader, p []byte) (http2Frame, error) {
|
|
return &http2UnknownFrame{fh, p}, nil
|
|
}
|
|
|
|
// A WindowUpdateFrame is used to implement flow control.
|
|
// See http://http2.github.io/http2-spec/#rfc.section.6.9
|
|
type http2WindowUpdateFrame struct {
|
|
http2FrameHeader
|
|
Increment uint32 // never read with high bit set
|
|
}
|
|
|
|
func http2parseWindowUpdateFrame(fh http2FrameHeader, p []byte) (http2Frame, error) {
|
|
if len(p) != 4 {
|
|
return nil, http2ConnectionError(http2ErrCodeFrameSize)
|
|
}
|
|
inc := binary.BigEndian.Uint32(p[:4]) & 0x7fffffff
|
|
if inc == 0 {
|
|
|
|
if fh.StreamID == 0 {
|
|
return nil, http2ConnectionError(http2ErrCodeProtocol)
|
|
}
|
|
return nil, http2StreamError{fh.StreamID, http2ErrCodeProtocol}
|
|
}
|
|
return &http2WindowUpdateFrame{
|
|
http2FrameHeader: fh,
|
|
Increment: inc,
|
|
}, nil
|
|
}
|
|
|
|
// WriteWindowUpdate writes a WINDOW_UPDATE frame.
|
|
// The increment value must be between 1 and 2,147,483,647, inclusive.
|
|
// If the Stream ID is zero, the window update applies to the
|
|
// connection as a whole.
|
|
func (f *http2Framer) WriteWindowUpdate(streamID, incr uint32) error {
|
|
|
|
if (incr < 1 || incr > 2147483647) && !f.AllowIllegalWrites {
|
|
return errors.New("illegal window increment value")
|
|
}
|
|
f.startWrite(http2FrameWindowUpdate, 0, streamID)
|
|
f.writeUint32(incr)
|
|
return f.endWrite()
|
|
}
|
|
|
|
// A HeadersFrame is used to open a stream and additionally carries a
|
|
// header block fragment.
|
|
type http2HeadersFrame struct {
|
|
http2FrameHeader
|
|
|
|
// Priority is set if FlagHeadersPriority is set in the FrameHeader.
|
|
Priority http2PriorityParam
|
|
|
|
headerFragBuf []byte // not owned
|
|
}
|
|
|
|
func (f *http2HeadersFrame) HeaderBlockFragment() []byte {
|
|
f.checkValid()
|
|
return f.headerFragBuf
|
|
}
|
|
|
|
func (f *http2HeadersFrame) HeadersEnded() bool {
|
|
return f.http2FrameHeader.Flags.Has(http2FlagHeadersEndHeaders)
|
|
}
|
|
|
|
func (f *http2HeadersFrame) StreamEnded() bool {
|
|
return f.http2FrameHeader.Flags.Has(http2FlagHeadersEndStream)
|
|
}
|
|
|
|
func (f *http2HeadersFrame) HasPriority() bool {
|
|
return f.http2FrameHeader.Flags.Has(http2FlagHeadersPriority)
|
|
}
|
|
|
|
func http2parseHeadersFrame(fh http2FrameHeader, p []byte) (_ http2Frame, err error) {
|
|
hf := &http2HeadersFrame{
|
|
http2FrameHeader: fh,
|
|
}
|
|
if fh.StreamID == 0 {
|
|
|
|
return nil, http2connError{http2ErrCodeProtocol, "HEADERS frame with stream ID 0"}
|
|
}
|
|
var padLength uint8
|
|
if fh.Flags.Has(http2FlagHeadersPadded) {
|
|
if p, padLength, err = http2readByte(p); err != nil {
|
|
return
|
|
}
|
|
}
|
|
if fh.Flags.Has(http2FlagHeadersPriority) {
|
|
var v uint32
|
|
p, v, err = http2readUint32(p)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
hf.Priority.StreamDep = v & 0x7fffffff
|
|
hf.Priority.Exclusive = (v != hf.Priority.StreamDep)
|
|
p, hf.Priority.Weight, err = http2readByte(p)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
if len(p)-int(padLength) <= 0 {
|
|
return nil, http2StreamError{fh.StreamID, http2ErrCodeProtocol}
|
|
}
|
|
hf.headerFragBuf = p[:len(p)-int(padLength)]
|
|
return hf, nil
|
|
}
|
|
|
|
// HeadersFrameParam are the parameters for writing a HEADERS frame.
|
|
type http2HeadersFrameParam struct {
|
|
// StreamID is the required Stream ID to initiate.
|
|
StreamID uint32
|
|
// BlockFragment is part (or all) of a Header Block.
|
|
BlockFragment []byte
|
|
|
|
// EndStream indicates that the header block is the last that
|
|
// the endpoint will send for the identified stream. Setting
|
|
// this flag causes the stream to enter one of "half closed"
|
|
// states.
|
|
EndStream bool
|
|
|
|
// EndHeaders indicates that this frame contains an entire
|
|
// header block and is not followed by any
|
|
// CONTINUATION frames.
|
|
EndHeaders bool
|
|
|
|
// PadLength is the optional number of bytes of zeros to add
|
|
// to this frame.
|
|
PadLength uint8
|
|
|
|
// Priority, if non-zero, includes stream priority information
|
|
// in the HEADER frame.
|
|
Priority http2PriorityParam
|
|
}
|
|
|
|
// WriteHeaders writes a single HEADERS frame.
|
|
//
|
|
// This is a low-level header writing method. Encoding headers and
|
|
// splitting them into any necessary CONTINUATION frames is handled
|
|
// elsewhere.
|
|
//
|
|
// It will perform exactly one Write to the underlying Writer.
|
|
// It is the caller's responsibility to not call other Write methods concurrently.
|
|
func (f *http2Framer) WriteHeaders(p http2HeadersFrameParam) error {
|
|
if !http2validStreamID(p.StreamID) && !f.AllowIllegalWrites {
|
|
return http2errStreamID
|
|
}
|
|
var flags http2Flags
|
|
if p.PadLength != 0 {
|
|
flags |= http2FlagHeadersPadded
|
|
}
|
|
if p.EndStream {
|
|
flags |= http2FlagHeadersEndStream
|
|
}
|
|
if p.EndHeaders {
|
|
flags |= http2FlagHeadersEndHeaders
|
|
}
|
|
if !p.Priority.IsZero() {
|
|
flags |= http2FlagHeadersPriority
|
|
}
|
|
f.startWrite(http2FrameHeaders, flags, p.StreamID)
|
|
if p.PadLength != 0 {
|
|
f.writeByte(p.PadLength)
|
|
}
|
|
if !p.Priority.IsZero() {
|
|
v := p.Priority.StreamDep
|
|
if !http2validStreamID(v) && !f.AllowIllegalWrites {
|
|
return errors.New("invalid dependent stream id")
|
|
}
|
|
if p.Priority.Exclusive {
|
|
v |= 1 << 31
|
|
}
|
|
f.writeUint32(v)
|
|
f.writeByte(p.Priority.Weight)
|
|
}
|
|
f.wbuf = append(f.wbuf, p.BlockFragment...)
|
|
f.wbuf = append(f.wbuf, http2padZeros[:p.PadLength]...)
|
|
return f.endWrite()
|
|
}
|
|
|
|
// A PriorityFrame specifies the sender-advised priority of a stream.
|
|
// See http://http2.github.io/http2-spec/#rfc.section.6.3
|
|
type http2PriorityFrame struct {
|
|
http2FrameHeader
|
|
http2PriorityParam
|
|
}
|
|
|
|
// PriorityParam are the stream prioritzation parameters.
|
|
type http2PriorityParam struct {
|
|
// StreamDep is a 31-bit stream identifier for the
|
|
// stream that this stream depends on. Zero means no
|
|
// dependency.
|
|
StreamDep uint32
|
|
|
|
// Exclusive is whether the dependency is exclusive.
|
|
Exclusive bool
|
|
|
|
// Weight is the stream's zero-indexed weight. It should be
|
|
// set together with StreamDep, or neither should be set. Per
|
|
// the spec, "Add one to the value to obtain a weight between
|
|
// 1 and 256."
|
|
Weight uint8
|
|
}
|
|
|
|
func (p http2PriorityParam) IsZero() bool {
|
|
return p == http2PriorityParam{}
|
|
}
|
|
|
|
func http2parsePriorityFrame(fh http2FrameHeader, payload []byte) (http2Frame, error) {
|
|
if fh.StreamID == 0 {
|
|
return nil, http2connError{http2ErrCodeProtocol, "PRIORITY frame with stream ID 0"}
|
|
}
|
|
if len(payload) != 5 {
|
|
return nil, http2connError{http2ErrCodeFrameSize, fmt.Sprintf("PRIORITY frame payload size was %d; want 5", len(payload))}
|
|
}
|
|
v := binary.BigEndian.Uint32(payload[:4])
|
|
streamID := v & 0x7fffffff
|
|
return &http2PriorityFrame{
|
|
http2FrameHeader: fh,
|
|
http2PriorityParam: http2PriorityParam{
|
|
Weight: payload[4],
|
|
StreamDep: streamID,
|
|
Exclusive: streamID != v,
|
|
},
|
|
}, nil
|
|
}
|
|
|
|
// WritePriority writes a PRIORITY frame.
|
|
//
|
|
// It will perform exactly one Write to the underlying Writer.
|
|
// It is the caller's responsibility to not call other Write methods concurrently.
|
|
func (f *http2Framer) WritePriority(streamID uint32, p http2PriorityParam) error {
|
|
if !http2validStreamID(streamID) && !f.AllowIllegalWrites {
|
|
return http2errStreamID
|
|
}
|
|
f.startWrite(http2FramePriority, 0, streamID)
|
|
v := p.StreamDep
|
|
if p.Exclusive {
|
|
v |= 1 << 31
|
|
}
|
|
f.writeUint32(v)
|
|
f.writeByte(p.Weight)
|
|
return f.endWrite()
|
|
}
|
|
|
|
// A RSTStreamFrame allows for abnormal termination of a stream.
|
|
// See http://http2.github.io/http2-spec/#rfc.section.6.4
|
|
type http2RSTStreamFrame struct {
|
|
http2FrameHeader
|
|
ErrCode http2ErrCode
|
|
}
|
|
|
|
func http2parseRSTStreamFrame(fh http2FrameHeader, p []byte) (http2Frame, error) {
|
|
if len(p) != 4 {
|
|
return nil, http2ConnectionError(http2ErrCodeFrameSize)
|
|
}
|
|
if fh.StreamID == 0 {
|
|
return nil, http2ConnectionError(http2ErrCodeProtocol)
|
|
}
|
|
return &http2RSTStreamFrame{fh, http2ErrCode(binary.BigEndian.Uint32(p[:4]))}, nil
|
|
}
|
|
|
|
// WriteRSTStream writes a RST_STREAM frame.
|
|
//
|
|
// It will perform exactly one Write to the underlying Writer.
|
|
// It is the caller's responsibility to not call other Write methods concurrently.
|
|
func (f *http2Framer) WriteRSTStream(streamID uint32, code http2ErrCode) error {
|
|
if !http2validStreamID(streamID) && !f.AllowIllegalWrites {
|
|
return http2errStreamID
|
|
}
|
|
f.startWrite(http2FrameRSTStream, 0, streamID)
|
|
f.writeUint32(uint32(code))
|
|
return f.endWrite()
|
|
}
|
|
|
|
// A ContinuationFrame is used to continue a sequence of header block fragments.
|
|
// See http://http2.github.io/http2-spec/#rfc.section.6.10
|
|
type http2ContinuationFrame struct {
|
|
http2FrameHeader
|
|
headerFragBuf []byte
|
|
}
|
|
|
|
func http2parseContinuationFrame(fh http2FrameHeader, p []byte) (http2Frame, error) {
|
|
if fh.StreamID == 0 {
|
|
return nil, http2connError{http2ErrCodeProtocol, "CONTINUATION frame with stream ID 0"}
|
|
}
|
|
return &http2ContinuationFrame{fh, p}, nil
|
|
}
|
|
|
|
func (f *http2ContinuationFrame) HeaderBlockFragment() []byte {
|
|
f.checkValid()
|
|
return f.headerFragBuf
|
|
}
|
|
|
|
func (f *http2ContinuationFrame) HeadersEnded() bool {
|
|
return f.http2FrameHeader.Flags.Has(http2FlagContinuationEndHeaders)
|
|
}
|
|
|
|
// WriteContinuation writes a CONTINUATION frame.
|
|
//
|
|
// It will perform exactly one Write to the underlying Writer.
|
|
// It is the caller's responsibility to not call other Write methods concurrently.
|
|
func (f *http2Framer) WriteContinuation(streamID uint32, endHeaders bool, headerBlockFragment []byte) error {
|
|
if !http2validStreamID(streamID) && !f.AllowIllegalWrites {
|
|
return http2errStreamID
|
|
}
|
|
var flags http2Flags
|
|
if endHeaders {
|
|
flags |= http2FlagContinuationEndHeaders
|
|
}
|
|
f.startWrite(http2FrameContinuation, flags, streamID)
|
|
f.wbuf = append(f.wbuf, headerBlockFragment...)
|
|
return f.endWrite()
|
|
}
|
|
|
|
// A PushPromiseFrame is used to initiate a server stream.
|
|
// See http://http2.github.io/http2-spec/#rfc.section.6.6
|
|
type http2PushPromiseFrame struct {
|
|
http2FrameHeader
|
|
PromiseID uint32
|
|
headerFragBuf []byte // not owned
|
|
}
|
|
|
|
func (f *http2PushPromiseFrame) HeaderBlockFragment() []byte {
|
|
f.checkValid()
|
|
return f.headerFragBuf
|
|
}
|
|
|
|
func (f *http2PushPromiseFrame) HeadersEnded() bool {
|
|
return f.http2FrameHeader.Flags.Has(http2FlagPushPromiseEndHeaders)
|
|
}
|
|
|
|
func http2parsePushPromise(fh http2FrameHeader, p []byte) (_ http2Frame, err error) {
|
|
pp := &http2PushPromiseFrame{
|
|
http2FrameHeader: fh,
|
|
}
|
|
if pp.StreamID == 0 {
|
|
|
|
return nil, http2ConnectionError(http2ErrCodeProtocol)
|
|
}
|
|
// The PUSH_PROMISE frame includes optional padding.
|
|
// Padding fields and flags are identical to those defined for DATA frames
|
|
var padLength uint8
|
|
if fh.Flags.Has(http2FlagPushPromisePadded) {
|
|
if p, padLength, err = http2readByte(p); err != nil {
|
|
return
|
|
}
|
|
}
|
|
|
|
p, pp.PromiseID, err = http2readUint32(p)
|
|
if err != nil {
|
|
return
|
|
}
|
|
pp.PromiseID = pp.PromiseID & (1<<31 - 1)
|
|
|
|
if int(padLength) > len(p) {
|
|
|
|
return nil, http2ConnectionError(http2ErrCodeProtocol)
|
|
}
|
|
pp.headerFragBuf = p[:len(p)-int(padLength)]
|
|
return pp, nil
|
|
}
|
|
|
|
// PushPromiseParam are the parameters for writing a PUSH_PROMISE frame.
|
|
type http2PushPromiseParam struct {
|
|
// StreamID is the required Stream ID to initiate.
|
|
StreamID uint32
|
|
|
|
// PromiseID is the required Stream ID which this
|
|
// Push Promises
|
|
PromiseID uint32
|
|
|
|
// BlockFragment is part (or all) of a Header Block.
|
|
BlockFragment []byte
|
|
|
|
// EndHeaders indicates that this frame contains an entire
|
|
// header block and is not followed by any
|
|
// CONTINUATION frames.
|
|
EndHeaders bool
|
|
|
|
// PadLength is the optional number of bytes of zeros to add
|
|
// to this frame.
|
|
PadLength uint8
|
|
}
|
|
|
|
// WritePushPromise writes a single PushPromise Frame.
|
|
//
|
|
// As with Header Frames, This is the low level call for writing
|
|
// individual frames. Continuation frames are handled elsewhere.
|
|
//
|
|
// It will perform exactly one Write to the underlying Writer.
|
|
// It is the caller's responsibility to not call other Write methods concurrently.
|
|
func (f *http2Framer) WritePushPromise(p http2PushPromiseParam) error {
|
|
if !http2validStreamID(p.StreamID) && !f.AllowIllegalWrites {
|
|
return http2errStreamID
|
|
}
|
|
var flags http2Flags
|
|
if p.PadLength != 0 {
|
|
flags |= http2FlagPushPromisePadded
|
|
}
|
|
if p.EndHeaders {
|
|
flags |= http2FlagPushPromiseEndHeaders
|
|
}
|
|
f.startWrite(http2FramePushPromise, flags, p.StreamID)
|
|
if p.PadLength != 0 {
|
|
f.writeByte(p.PadLength)
|
|
}
|
|
if !http2validStreamID(p.PromiseID) && !f.AllowIllegalWrites {
|
|
return http2errStreamID
|
|
}
|
|
f.writeUint32(p.PromiseID)
|
|
f.wbuf = append(f.wbuf, p.BlockFragment...)
|
|
f.wbuf = append(f.wbuf, http2padZeros[:p.PadLength]...)
|
|
return f.endWrite()
|
|
}
|
|
|
|
// WriteRawFrame writes a raw frame. This can be used to write
|
|
// extension frames unknown to this package.
|
|
func (f *http2Framer) WriteRawFrame(t http2FrameType, flags http2Flags, streamID uint32, payload []byte) error {
|
|
f.startWrite(t, flags, streamID)
|
|
f.writeBytes(payload)
|
|
return f.endWrite()
|
|
}
|
|
|
|
func http2readByte(p []byte) (remain []byte, b byte, err error) {
|
|
if len(p) == 0 {
|
|
return nil, 0, io.ErrUnexpectedEOF
|
|
}
|
|
return p[1:], p[0], nil
|
|
}
|
|
|
|
func http2readUint32(p []byte) (remain []byte, v uint32, err error) {
|
|
if len(p) < 4 {
|
|
return nil, 0, io.ErrUnexpectedEOF
|
|
}
|
|
return p[4:], binary.BigEndian.Uint32(p[:4]), nil
|
|
}
|
|
|
|
type http2streamEnder interface {
|
|
StreamEnded() bool
|
|
}
|
|
|
|
type http2headersEnder interface {
|
|
HeadersEnded() bool
|
|
}
|
|
|
|
func http2summarizeFrame(f http2Frame) string {
|
|
var buf bytes.Buffer
|
|
f.Header().writeDebug(&buf)
|
|
switch f := f.(type) {
|
|
case *http2SettingsFrame:
|
|
n := 0
|
|
f.ForeachSetting(func(s http2Setting) error {
|
|
n++
|
|
if n == 1 {
|
|
buf.WriteString(", settings:")
|
|
}
|
|
fmt.Fprintf(&buf, " %v=%v,", s.ID, s.Val)
|
|
return nil
|
|
})
|
|
if n > 0 {
|
|
buf.Truncate(buf.Len() - 1)
|
|
}
|
|
case *http2DataFrame:
|
|
data := f.Data()
|
|
const max = 256
|
|
if len(data) > max {
|
|
data = data[:max]
|
|
}
|
|
fmt.Fprintf(&buf, " data=%q", data)
|
|
if len(f.Data()) > max {
|
|
fmt.Fprintf(&buf, " (%d bytes omitted)", len(f.Data())-max)
|
|
}
|
|
case *http2WindowUpdateFrame:
|
|
if f.StreamID == 0 {
|
|
buf.WriteString(" (conn)")
|
|
}
|
|
fmt.Fprintf(&buf, " incr=%v", f.Increment)
|
|
case *http2PingFrame:
|
|
fmt.Fprintf(&buf, " ping=%q", f.Data[:])
|
|
case *http2GoAwayFrame:
|
|
fmt.Fprintf(&buf, " LastStreamID=%v ErrCode=%v Debug=%q",
|
|
f.LastStreamID, f.ErrCode, f.debugData)
|
|
case *http2RSTStreamFrame:
|
|
fmt.Fprintf(&buf, " ErrCode=%v", f.ErrCode)
|
|
}
|
|
return buf.String()
|
|
}
|
|
|
|
func http2requestCancel(req *Request) <-chan struct{} { return req.Cancel }
|
|
|
|
var http2DebugGoroutines = os.Getenv("DEBUG_HTTP2_GOROUTINES") == "1"
|
|
|
|
type http2goroutineLock uint64
|
|
|
|
func http2newGoroutineLock() http2goroutineLock {
|
|
if !http2DebugGoroutines {
|
|
return 0
|
|
}
|
|
return http2goroutineLock(http2curGoroutineID())
|
|
}
|
|
|
|
func (g http2goroutineLock) check() {
|
|
if !http2DebugGoroutines {
|
|
return
|
|
}
|
|
if http2curGoroutineID() != uint64(g) {
|
|
panic("running on the wrong goroutine")
|
|
}
|
|
}
|
|
|
|
func (g http2goroutineLock) checkNotOn() {
|
|
if !http2DebugGoroutines {
|
|
return
|
|
}
|
|
if http2curGoroutineID() == uint64(g) {
|
|
panic("running on the wrong goroutine")
|
|
}
|
|
}
|
|
|
|
var http2goroutineSpace = []byte("goroutine ")
|
|
|
|
func http2curGoroutineID() uint64 {
|
|
bp := http2littleBuf.Get().(*[]byte)
|
|
defer http2littleBuf.Put(bp)
|
|
b := *bp
|
|
b = b[:runtime.Stack(b, false)]
|
|
|
|
b = bytes.TrimPrefix(b, http2goroutineSpace)
|
|
i := bytes.IndexByte(b, ' ')
|
|
if i < 0 {
|
|
panic(fmt.Sprintf("No space found in %q", b))
|
|
}
|
|
b = b[:i]
|
|
n, err := http2parseUintBytes(b, 10, 64)
|
|
if err != nil {
|
|
panic(fmt.Sprintf("Failed to parse goroutine ID out of %q: %v", b, err))
|
|
}
|
|
return n
|
|
}
|
|
|
|
var http2littleBuf = sync.Pool{
|
|
New: func() interface{} {
|
|
buf := make([]byte, 64)
|
|
return &buf
|
|
},
|
|
}
|
|
|
|
// parseUintBytes is like strconv.ParseUint, but using a []byte.
|
|
func http2parseUintBytes(s []byte, base int, bitSize int) (n uint64, err error) {
|
|
var cutoff, maxVal uint64
|
|
|
|
if bitSize == 0 {
|
|
bitSize = int(strconv.IntSize)
|
|
}
|
|
|
|
s0 := s
|
|
switch {
|
|
case len(s) < 1:
|
|
err = strconv.ErrSyntax
|
|
goto Error
|
|
|
|
case 2 <= base && base <= 36:
|
|
|
|
case base == 0:
|
|
|
|
switch {
|
|
case s[0] == '0' && len(s) > 1 && (s[1] == 'x' || s[1] == 'X'):
|
|
base = 16
|
|
s = s[2:]
|
|
if len(s) < 1 {
|
|
err = strconv.ErrSyntax
|
|
goto Error
|
|
}
|
|
case s[0] == '0':
|
|
base = 8
|
|
default:
|
|
base = 10
|
|
}
|
|
|
|
default:
|
|
err = errors.New("invalid base " + strconv.Itoa(base))
|
|
goto Error
|
|
}
|
|
|
|
n = 0
|
|
cutoff = http2cutoff64(base)
|
|
maxVal = 1<<uint(bitSize) - 1
|
|
|
|
for i := 0; i < len(s); i++ {
|
|
var v byte
|
|
d := s[i]
|
|
switch {
|
|
case '0' <= d && d <= '9':
|
|
v = d - '0'
|
|
case 'a' <= d && d <= 'z':
|
|
v = d - 'a' + 10
|
|
case 'A' <= d && d <= 'Z':
|
|
v = d - 'A' + 10
|
|
default:
|
|
n = 0
|
|
err = strconv.ErrSyntax
|
|
goto Error
|
|
}
|
|
if int(v) >= base {
|
|
n = 0
|
|
err = strconv.ErrSyntax
|
|
goto Error
|
|
}
|
|
|
|
if n >= cutoff {
|
|
|
|
n = 1<<64 - 1
|
|
err = strconv.ErrRange
|
|
goto Error
|
|
}
|
|
n *= uint64(base)
|
|
|
|
n1 := n + uint64(v)
|
|
if n1 < n || n1 > maxVal {
|
|
|
|
n = 1<<64 - 1
|
|
err = strconv.ErrRange
|
|
goto Error
|
|
}
|
|
n = n1
|
|
}
|
|
|
|
return n, nil
|
|
|
|
Error:
|
|
return n, &strconv.NumError{Func: "ParseUint", Num: string(s0), Err: err}
|
|
}
|
|
|
|
// Return the first number n such that n*base >= 1<<64.
|
|
func http2cutoff64(base int) uint64 {
|
|
if base < 2 {
|
|
return 0
|
|
}
|
|
return (1<<64-1)/uint64(base) + 1
|
|
}
|
|
|
|
var (
|
|
http2commonLowerHeader = map[string]string{} // Go-Canonical-Case -> lower-case
|
|
http2commonCanonHeader = map[string]string{} // lower-case -> Go-Canonical-Case
|
|
)
|
|
|
|
func init() {
|
|
for _, v := range []string{
|
|
"accept",
|
|
"accept-charset",
|
|
"accept-encoding",
|
|
"accept-language",
|
|
"accept-ranges",
|
|
"age",
|
|
"access-control-allow-origin",
|
|
"allow",
|
|
"authorization",
|
|
"cache-control",
|
|
"content-disposition",
|
|
"content-encoding",
|
|
"content-language",
|
|
"content-length",
|
|
"content-location",
|
|
"content-range",
|
|
"content-type",
|
|
"cookie",
|
|
"date",
|
|
"etag",
|
|
"expect",
|
|
"expires",
|
|
"from",
|
|
"host",
|
|
"if-match",
|
|
"if-modified-since",
|
|
"if-none-match",
|
|
"if-unmodified-since",
|
|
"last-modified",
|
|
"link",
|
|
"location",
|
|
"max-forwards",
|
|
"proxy-authenticate",
|
|
"proxy-authorization",
|
|
"range",
|
|
"referer",
|
|
"refresh",
|
|
"retry-after",
|
|
"server",
|
|
"set-cookie",
|
|
"strict-transport-security",
|
|
"trailer",
|
|
"transfer-encoding",
|
|
"user-agent",
|
|
"vary",
|
|
"via",
|
|
"www-authenticate",
|
|
} {
|
|
chk := CanonicalHeaderKey(v)
|
|
http2commonLowerHeader[chk] = v
|
|
http2commonCanonHeader[v] = chk
|
|
}
|
|
}
|
|
|
|
func http2lowerHeader(v string) string {
|
|
if s, ok := http2commonLowerHeader[v]; ok {
|
|
return s
|
|
}
|
|
return strings.ToLower(v)
|
|
}
|
|
|
|
var (
|
|
http2VerboseLogs bool
|
|
http2logFrameWrites bool
|
|
http2logFrameReads bool
|
|
)
|
|
|
|
func init() {
|
|
e := os.Getenv("GODEBUG")
|
|
if strings.Contains(e, "http2debug=1") {
|
|
http2VerboseLogs = true
|
|
}
|
|
if strings.Contains(e, "http2debug=2") {
|
|
http2VerboseLogs = true
|
|
http2logFrameWrites = true
|
|
http2logFrameReads = true
|
|
}
|
|
}
|
|
|
|
const (
|
|
// ClientPreface is the string that must be sent by new
|
|
// connections from clients.
|
|
http2ClientPreface = "PRI * HTTP/2.0\r\n\r\nSM\r\n\r\n"
|
|
|
|
// SETTINGS_MAX_FRAME_SIZE default
|
|
// http://http2.github.io/http2-spec/#rfc.section.6.5.2
|
|
http2initialMaxFrameSize = 16384
|
|
|
|
// NextProtoTLS is the NPN/ALPN protocol negotiated during
|
|
// HTTP/2's TLS setup.
|
|
http2NextProtoTLS = "h2"
|
|
|
|
// http://http2.github.io/http2-spec/#SettingValues
|
|
http2initialHeaderTableSize = 4096
|
|
|
|
http2initialWindowSize = 65535 // 6.9.2 Initial Flow Control Window Size
|
|
|
|
http2defaultMaxReadFrameSize = 1 << 20
|
|
)
|
|
|
|
var (
|
|
http2clientPreface = []byte(http2ClientPreface)
|
|
)
|
|
|
|
type http2streamState int
|
|
|
|
const (
|
|
http2stateIdle http2streamState = iota
|
|
http2stateOpen
|
|
http2stateHalfClosedLocal
|
|
http2stateHalfClosedRemote
|
|
http2stateResvLocal
|
|
http2stateResvRemote
|
|
http2stateClosed
|
|
)
|
|
|
|
var http2stateName = [...]string{
|
|
http2stateIdle: "Idle",
|
|
http2stateOpen: "Open",
|
|
http2stateHalfClosedLocal: "HalfClosedLocal",
|
|
http2stateHalfClosedRemote: "HalfClosedRemote",
|
|
http2stateResvLocal: "ResvLocal",
|
|
http2stateResvRemote: "ResvRemote",
|
|
http2stateClosed: "Closed",
|
|
}
|
|
|
|
func (st http2streamState) String() string {
|
|
return http2stateName[st]
|
|
}
|
|
|
|
// Setting is a setting parameter: which setting it is, and its value.
|
|
type http2Setting struct {
|
|
// ID is which setting is being set.
|
|
// See http://http2.github.io/http2-spec/#SettingValues
|
|
ID http2SettingID
|
|
|
|
// Val is the value.
|
|
Val uint32
|
|
}
|
|
|
|
func (s http2Setting) String() string {
|
|
return fmt.Sprintf("[%v = %d]", s.ID, s.Val)
|
|
}
|
|
|
|
// Valid reports whether the setting is valid.
|
|
func (s http2Setting) Valid() error {
|
|
|
|
switch s.ID {
|
|
case http2SettingEnablePush:
|
|
if s.Val != 1 && s.Val != 0 {
|
|
return http2ConnectionError(http2ErrCodeProtocol)
|
|
}
|
|
case http2SettingInitialWindowSize:
|
|
if s.Val > 1<<31-1 {
|
|
return http2ConnectionError(http2ErrCodeFlowControl)
|
|
}
|
|
case http2SettingMaxFrameSize:
|
|
if s.Val < 16384 || s.Val > 1<<24-1 {
|
|
return http2ConnectionError(http2ErrCodeProtocol)
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// A SettingID is an HTTP/2 setting as defined in
|
|
// http://http2.github.io/http2-spec/#iana-settings
|
|
type http2SettingID uint16
|
|
|
|
const (
|
|
http2SettingHeaderTableSize http2SettingID = 0x1
|
|
http2SettingEnablePush http2SettingID = 0x2
|
|
http2SettingMaxConcurrentStreams http2SettingID = 0x3
|
|
http2SettingInitialWindowSize http2SettingID = 0x4
|
|
http2SettingMaxFrameSize http2SettingID = 0x5
|
|
http2SettingMaxHeaderListSize http2SettingID = 0x6
|
|
)
|
|
|
|
var http2settingName = map[http2SettingID]string{
|
|
http2SettingHeaderTableSize: "HEADER_TABLE_SIZE",
|
|
http2SettingEnablePush: "ENABLE_PUSH",
|
|
http2SettingMaxConcurrentStreams: "MAX_CONCURRENT_STREAMS",
|
|
http2SettingInitialWindowSize: "INITIAL_WINDOW_SIZE",
|
|
http2SettingMaxFrameSize: "MAX_FRAME_SIZE",
|
|
http2SettingMaxHeaderListSize: "MAX_HEADER_LIST_SIZE",
|
|
}
|
|
|
|
func (s http2SettingID) String() string {
|
|
if v, ok := http2settingName[s]; ok {
|
|
return v
|
|
}
|
|
return fmt.Sprintf("UNKNOWN_SETTING_%d", uint16(s))
|
|
}
|
|
|
|
var (
|
|
http2errInvalidHeaderFieldName = errors.New("http2: invalid header field name")
|
|
http2errInvalidHeaderFieldValue = errors.New("http2: invalid header field value")
|
|
)
|
|
|
|
// validHeaderFieldName reports whether v is a valid header field name (key).
|
|
// RFC 7230 says:
|
|
// header-field = field-name ":" OWS field-value OWS
|
|
// field-name = token
|
|
// tchar = "!" / "#" / "$" / "%" / "&" / "'" / "*" / "+" / "-" / "." /
|
|
// "^" / "_" / "
|
|
// Further, http2 says:
|
|
// "Just as in HTTP/1.x, header field names are strings of ASCII
|
|
// characters that are compared in a case-insensitive
|
|
// fashion. However, header field names MUST be converted to
|
|
// lowercase prior to their encoding in HTTP/2. "
|
|
func http2validHeaderFieldName(v string) bool {
|
|
if len(v) == 0 {
|
|
return false
|
|
}
|
|
for _, r := range v {
|
|
if int(r) >= len(http2isTokenTable) || ('A' <= r && r <= 'Z') {
|
|
return false
|
|
}
|
|
if !http2isTokenTable[byte(r)] {
|
|
return false
|
|
}
|
|
}
|
|
return true
|
|
}
|
|
|
|
// validHeaderFieldValue reports whether v is a valid header field value.
|
|
//
|
|
// RFC 7230 says:
|
|
// field-value = *( field-content / obs-fold )
|
|
// obj-fold = N/A to http2, and deprecated
|
|
// field-content = field-vchar [ 1*( SP / HTAB ) field-vchar ]
|
|
// field-vchar = VCHAR / obs-text
|
|
// obs-text = %x80-FF
|
|
// VCHAR = "any visible [USASCII] character"
|
|
//
|
|
// http2 further says: "Similarly, HTTP/2 allows header field values
|
|
// that are not valid. While most of the values that can be encoded
|
|
// will not alter header field parsing, carriage return (CR, ASCII
|
|
// 0xd), line feed (LF, ASCII 0xa), and the zero character (NUL, ASCII
|
|
// 0x0) might be exploited by an attacker if they are translated
|
|
// verbatim. Any request or response that contains a character not
|
|
// permitted in a header field value MUST be treated as malformed
|
|
// (Section 8.1.2.6). Valid characters are defined by the
|
|
// field-content ABNF rule in Section 3.2 of [RFC7230]."
|
|
//
|
|
// This function does not (yet?) properly handle the rejection of
|
|
// strings that begin or end with SP or HTAB.
|
|
func http2validHeaderFieldValue(v string) bool {
|
|
for i := 0; i < len(v); i++ {
|
|
if b := v[i]; b < ' ' && b != '\t' || b == 0x7f {
|
|
return false
|
|
}
|
|
}
|
|
return true
|
|
}
|
|
|
|
var http2httpCodeStringCommon = map[int]string{} // n -> strconv.Itoa(n)
|
|
|
|
func init() {
|
|
for i := 100; i <= 999; i++ {
|
|
if v := StatusText(i); v != "" {
|
|
http2httpCodeStringCommon[i] = strconv.Itoa(i)
|
|
}
|
|
}
|
|
}
|
|
|
|
func http2httpCodeString(code int) string {
|
|
if s, ok := http2httpCodeStringCommon[code]; ok {
|
|
return s
|
|
}
|
|
return strconv.Itoa(code)
|
|
}
|
|
|
|
// from pkg io
|
|
type http2stringWriter interface {
|
|
WriteString(s string) (n int, err error)
|
|
}
|
|
|
|
// A gate lets two goroutines coordinate their activities.
|
|
type http2gate chan struct{}
|
|
|
|
func (g http2gate) Done() { g <- struct{}{} }
|
|
|
|
func (g http2gate) Wait() { <-g }
|
|
|
|
// A closeWaiter is like a sync.WaitGroup but only goes 1 to 0 (open to closed).
|
|
type http2closeWaiter chan struct{}
|
|
|
|
// Init makes a closeWaiter usable.
|
|
// It exists because so a closeWaiter value can be placed inside a
|
|
// larger struct and have the Mutex and Cond's memory in the same
|
|
// allocation.
|
|
func (cw *http2closeWaiter) Init() {
|
|
*cw = make(chan struct{})
|
|
}
|
|
|
|
// Close marks the closeWaiter as closed and unblocks any waiters.
|
|
func (cw http2closeWaiter) Close() {
|
|
close(cw)
|
|
}
|
|
|
|
// Wait waits for the closeWaiter to become closed.
|
|
func (cw http2closeWaiter) Wait() {
|
|
<-cw
|
|
}
|
|
|
|
// bufferedWriter is a buffered writer that writes to w.
|
|
// Its buffered writer is lazily allocated as needed, to minimize
|
|
// idle memory usage with many connections.
|
|
type http2bufferedWriter struct {
|
|
w io.Writer // immutable
|
|
bw *bufio.Writer // non-nil when data is buffered
|
|
}
|
|
|
|
func http2newBufferedWriter(w io.Writer) *http2bufferedWriter {
|
|
return &http2bufferedWriter{w: w}
|
|
}
|
|
|
|
var http2bufWriterPool = sync.Pool{
|
|
New: func() interface{} {
|
|
|
|
return bufio.NewWriterSize(nil, 4<<10)
|
|
},
|
|
}
|
|
|
|
func (w *http2bufferedWriter) Write(p []byte) (n int, err error) {
|
|
if w.bw == nil {
|
|
bw := http2bufWriterPool.Get().(*bufio.Writer)
|
|
bw.Reset(w.w)
|
|
w.bw = bw
|
|
}
|
|
return w.bw.Write(p)
|
|
}
|
|
|
|
func (w *http2bufferedWriter) Flush() error {
|
|
bw := w.bw
|
|
if bw == nil {
|
|
return nil
|
|
}
|
|
err := bw.Flush()
|
|
bw.Reset(nil)
|
|
http2bufWriterPool.Put(bw)
|
|
w.bw = nil
|
|
return err
|
|
}
|
|
|
|
func http2mustUint31(v int32) uint32 {
|
|
if v < 0 || v > 2147483647 {
|
|
panic("out of range")
|
|
}
|
|
return uint32(v)
|
|
}
|
|
|
|
// bodyAllowedForStatus reports whether a given response status code
|
|
// permits a body. See RFC2616, section 4.4.
|
|
func http2bodyAllowedForStatus(status int) bool {
|
|
switch {
|
|
case status >= 100 && status <= 199:
|
|
return false
|
|
case status == 204:
|
|
return false
|
|
case status == 304:
|
|
return false
|
|
}
|
|
return true
|
|
}
|
|
|
|
type http2httpError struct {
|
|
msg string
|
|
timeout bool
|
|
}
|
|
|
|
func (e *http2httpError) Error() string { return e.msg }
|
|
|
|
func (e *http2httpError) Timeout() bool { return e.timeout }
|
|
|
|
func (e *http2httpError) Temporary() bool { return true }
|
|
|
|
var http2errTimeout error = &http2httpError{msg: "http2: timeout awaiting response headers", timeout: true}
|
|
|
|
var http2isTokenTable = [127]bool{
|
|
'!': true,
|
|
'#': true,
|
|
'$': true,
|
|
'%': true,
|
|
'&': true,
|
|
'\'': true,
|
|
'*': true,
|
|
'+': true,
|
|
'-': true,
|
|
'.': true,
|
|
'0': true,
|
|
'1': true,
|
|
'2': true,
|
|
'3': true,
|
|
'4': true,
|
|
'5': true,
|
|
'6': true,
|
|
'7': true,
|
|
'8': true,
|
|
'9': true,
|
|
'A': true,
|
|
'B': true,
|
|
'C': true,
|
|
'D': true,
|
|
'E': true,
|
|
'F': true,
|
|
'G': true,
|
|
'H': true,
|
|
'I': true,
|
|
'J': true,
|
|
'K': true,
|
|
'L': true,
|
|
'M': true,
|
|
'N': true,
|
|
'O': true,
|
|
'P': true,
|
|
'Q': true,
|
|
'R': true,
|
|
'S': true,
|
|
'T': true,
|
|
'U': true,
|
|
'W': true,
|
|
'V': true,
|
|
'X': true,
|
|
'Y': true,
|
|
'Z': true,
|
|
'^': true,
|
|
'_': true,
|
|
'`': true,
|
|
'a': true,
|
|
'b': true,
|
|
'c': true,
|
|
'd': true,
|
|
'e': true,
|
|
'f': true,
|
|
'g': true,
|
|
'h': true,
|
|
'i': true,
|
|
'j': true,
|
|
'k': true,
|
|
'l': true,
|
|
'm': true,
|
|
'n': true,
|
|
'o': true,
|
|
'p': true,
|
|
'q': true,
|
|
'r': true,
|
|
's': true,
|
|
't': true,
|
|
'u': true,
|
|
'v': true,
|
|
'w': true,
|
|
'x': true,
|
|
'y': true,
|
|
'z': true,
|
|
'|': true,
|
|
'~': true,
|
|
}
|
|
|
|
type http2connectionStater interface {
|
|
ConnectionState() tls.ConnectionState
|
|
}
|
|
|
|
// pipe is a goroutine-safe io.Reader/io.Writer pair. It's like
|
|
// io.Pipe except there are no PipeReader/PipeWriter halves, and the
|
|
// underlying buffer is an interface. (io.Pipe is always unbuffered)
|
|
type http2pipe struct {
|
|
mu sync.Mutex
|
|
c sync.Cond // c.L lazily initialized to &p.mu
|
|
b http2pipeBuffer
|
|
err error // read error once empty. non-nil means closed.
|
|
breakErr error // immediate read error (caller doesn't see rest of b)
|
|
donec chan struct{} // closed on error
|
|
readFn func() // optional code to run in Read before error
|
|
}
|
|
|
|
type http2pipeBuffer interface {
|
|
Len() int
|
|
io.Writer
|
|
io.Reader
|
|
}
|
|
|
|
// Read waits until data is available and copies bytes
|
|
// from the buffer into p.
|
|
func (p *http2pipe) Read(d []byte) (n int, err error) {
|
|
p.mu.Lock()
|
|
defer p.mu.Unlock()
|
|
if p.c.L == nil {
|
|
p.c.L = &p.mu
|
|
}
|
|
for {
|
|
if p.breakErr != nil {
|
|
return 0, p.breakErr
|
|
}
|
|
if p.b.Len() > 0 {
|
|
return p.b.Read(d)
|
|
}
|
|
if p.err != nil {
|
|
if p.readFn != nil {
|
|
p.readFn()
|
|
p.readFn = nil
|
|
}
|
|
return 0, p.err
|
|
}
|
|
p.c.Wait()
|
|
}
|
|
}
|
|
|
|
var http2errClosedPipeWrite = errors.New("write on closed buffer")
|
|
|
|
// Write copies bytes from p into the buffer and wakes a reader.
|
|
// It is an error to write more data than the buffer can hold.
|
|
func (p *http2pipe) Write(d []byte) (n int, err error) {
|
|
p.mu.Lock()
|
|
defer p.mu.Unlock()
|
|
if p.c.L == nil {
|
|
p.c.L = &p.mu
|
|
}
|
|
defer p.c.Signal()
|
|
if p.err != nil {
|
|
return 0, http2errClosedPipeWrite
|
|
}
|
|
return p.b.Write(d)
|
|
}
|
|
|
|
// CloseWithError causes the next Read (waking up a current blocked
|
|
// Read if needed) to return the provided err after all data has been
|
|
// read.
|
|
//
|
|
// The error must be non-nil.
|
|
func (p *http2pipe) CloseWithError(err error) { p.closeWithError(&p.err, err, nil) }
|
|
|
|
// BreakWithError causes the next Read (waking up a current blocked
|
|
// Read if needed) to return the provided err immediately, without
|
|
// waiting for unread data.
|
|
func (p *http2pipe) BreakWithError(err error) { p.closeWithError(&p.breakErr, err, nil) }
|
|
|
|
// closeWithErrorAndCode is like CloseWithError but also sets some code to run
|
|
// in the caller's goroutine before returning the error.
|
|
func (p *http2pipe) closeWithErrorAndCode(err error, fn func()) { p.closeWithError(&p.err, err, fn) }
|
|
|
|
func (p *http2pipe) closeWithError(dst *error, err error, fn func()) {
|
|
if err == nil {
|
|
panic("err must be non-nil")
|
|
}
|
|
p.mu.Lock()
|
|
defer p.mu.Unlock()
|
|
if p.c.L == nil {
|
|
p.c.L = &p.mu
|
|
}
|
|
defer p.c.Signal()
|
|
if *dst != nil {
|
|
|
|
return
|
|
}
|
|
p.readFn = fn
|
|
*dst = err
|
|
p.closeDoneLocked()
|
|
}
|
|
|
|
// requires p.mu be held.
|
|
func (p *http2pipe) closeDoneLocked() {
|
|
if p.donec == nil {
|
|
return
|
|
}
|
|
|
|
select {
|
|
case <-p.donec:
|
|
default:
|
|
close(p.donec)
|
|
}
|
|
}
|
|
|
|
// Err returns the error (if any) first set by BreakWithError or CloseWithError.
|
|
func (p *http2pipe) Err() error {
|
|
p.mu.Lock()
|
|
defer p.mu.Unlock()
|
|
if p.breakErr != nil {
|
|
return p.breakErr
|
|
}
|
|
return p.err
|
|
}
|
|
|
|
// Done returns a channel which is closed if and when this pipe is closed
|
|
// with CloseWithError.
|
|
func (p *http2pipe) Done() <-chan struct{} {
|
|
p.mu.Lock()
|
|
defer p.mu.Unlock()
|
|
if p.donec == nil {
|
|
p.donec = make(chan struct{})
|
|
if p.err != nil || p.breakErr != nil {
|
|
|
|
p.closeDoneLocked()
|
|
}
|
|
}
|
|
return p.donec
|
|
}
|
|
|
|
const (
|
|
http2prefaceTimeout = 10 * time.Second
|
|
http2firstSettingsTimeout = 2 * time.Second // should be in-flight with preface anyway
|
|
http2handlerChunkWriteSize = 4 << 10
|
|
http2defaultMaxStreams = 250 // TODO: make this 100 as the GFE seems to?
|
|
)
|
|
|
|
var (
|
|
http2errClientDisconnected = errors.New("client disconnected")
|
|
http2errClosedBody = errors.New("body closed by handler")
|
|
http2errHandlerComplete = errors.New("http2: request body closed due to handler exiting")
|
|
http2errStreamClosed = errors.New("http2: stream closed")
|
|
)
|
|
|
|
var http2responseWriterStatePool = sync.Pool{
|
|
New: func() interface{} {
|
|
rws := &http2responseWriterState{}
|
|
rws.bw = bufio.NewWriterSize(http2chunkWriter{rws}, http2handlerChunkWriteSize)
|
|
return rws
|
|
},
|
|
}
|
|
|
|
// Test hooks.
|
|
var (
|
|
http2testHookOnConn func()
|
|
http2testHookGetServerConn func(*http2serverConn)
|
|
http2testHookOnPanicMu *sync.Mutex // nil except in tests
|
|
http2testHookOnPanic func(sc *http2serverConn, panicVal interface{}) (rePanic bool)
|
|
)
|
|
|
|
// Server is an HTTP/2 server.
|
|
type http2Server struct {
|
|
// MaxHandlers limits the number of http.Handler ServeHTTP goroutines
|
|
// which may run at a time over all connections.
|
|
// Negative or zero no limit.
|
|
// TODO: implement
|
|
MaxHandlers int
|
|
|
|
// MaxConcurrentStreams optionally specifies the number of
|
|
// concurrent streams that each client may have open at a
|
|
// time. This is unrelated to the number of http.Handler goroutines
|
|
// which may be active globally, which is MaxHandlers.
|
|
// If zero, MaxConcurrentStreams defaults to at least 100, per
|
|
// the HTTP/2 spec's recommendations.
|
|
MaxConcurrentStreams uint32
|
|
|
|
// MaxReadFrameSize optionally specifies the largest frame
|
|
// this server is willing to read. A valid value is between
|
|
// 16k and 16M, inclusive. If zero or otherwise invalid, a
|
|
// default value is used.
|
|
MaxReadFrameSize uint32
|
|
|
|
// PermitProhibitedCipherSuites, if true, permits the use of
|
|
// cipher suites prohibited by the HTTP/2 spec.
|
|
PermitProhibitedCipherSuites bool
|
|
}
|
|
|
|
func (s *http2Server) maxReadFrameSize() uint32 {
|
|
if v := s.MaxReadFrameSize; v >= http2minMaxFrameSize && v <= http2maxFrameSize {
|
|
return v
|
|
}
|
|
return http2defaultMaxReadFrameSize
|
|
}
|
|
|
|
func (s *http2Server) maxConcurrentStreams() uint32 {
|
|
if v := s.MaxConcurrentStreams; v > 0 {
|
|
return v
|
|
}
|
|
return http2defaultMaxStreams
|
|
}
|
|
|
|
// ConfigureServer adds HTTP/2 support to a net/http Server.
|
|
//
|
|
// The configuration conf may be nil.
|
|
//
|
|
// ConfigureServer must be called before s begins serving.
|
|
func http2ConfigureServer(s *Server, conf *http2Server) error {
|
|
if conf == nil {
|
|
conf = new(http2Server)
|
|
}
|
|
|
|
if s.TLSConfig == nil {
|
|
s.TLSConfig = new(tls.Config)
|
|
} else if s.TLSConfig.CipherSuites != nil {
|
|
// If they already provided a CipherSuite list, return
|
|
// an error if it has a bad order or is missing
|
|
// ECDHE_RSA_WITH_AES_128_GCM_SHA256.
|
|
const requiredCipher = tls.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
|
|
haveRequired := false
|
|
sawBad := false
|
|
for i, cs := range s.TLSConfig.CipherSuites {
|
|
if cs == requiredCipher {
|
|
haveRequired = true
|
|
}
|
|
if http2isBadCipher(cs) {
|
|
sawBad = true
|
|
} else if sawBad {
|
|
return fmt.Errorf("http2: TLSConfig.CipherSuites index %d contains an HTTP/2-approved cipher suite (%#04x), but it comes after unapproved cipher suites. With this configuration, clients that don't support previous, approved cipher suites may be given an unapproved one and reject the connection.", i, cs)
|
|
}
|
|
}
|
|
if !haveRequired {
|
|
return fmt.Errorf("http2: TLSConfig.CipherSuites is missing HTTP/2-required TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256")
|
|
}
|
|
}
|
|
|
|
s.TLSConfig.PreferServerCipherSuites = true
|
|
|
|
haveNPN := false
|
|
for _, p := range s.TLSConfig.NextProtos {
|
|
if p == http2NextProtoTLS {
|
|
haveNPN = true
|
|
break
|
|
}
|
|
}
|
|
if !haveNPN {
|
|
s.TLSConfig.NextProtos = append(s.TLSConfig.NextProtos, http2NextProtoTLS)
|
|
}
|
|
|
|
s.TLSConfig.NextProtos = append(s.TLSConfig.NextProtos, "h2-14")
|
|
|
|
if s.TLSNextProto == nil {
|
|
s.TLSNextProto = map[string]func(*Server, *tls.Conn, Handler){}
|
|
}
|
|
protoHandler := func(hs *Server, c *tls.Conn, h Handler) {
|
|
if http2testHookOnConn != nil {
|
|
http2testHookOnConn()
|
|
}
|
|
conf.ServeConn(c, &http2ServeConnOpts{
|
|
Handler: h,
|
|
BaseConfig: hs,
|
|
})
|
|
}
|
|
s.TLSNextProto[http2NextProtoTLS] = protoHandler
|
|
s.TLSNextProto["h2-14"] = protoHandler
|
|
return nil
|
|
}
|
|
|
|
// ServeConnOpts are options for the Server.ServeConn method.
|
|
type http2ServeConnOpts struct {
|
|
// BaseConfig optionally sets the base configuration
|
|
// for values. If nil, defaults are used.
|
|
BaseConfig *Server
|
|
|
|
// Handler specifies which handler to use for processing
|
|
// requests. If nil, BaseConfig.Handler is used. If BaseConfig
|
|
// or BaseConfig.Handler is nil, http.DefaultServeMux is used.
|
|
Handler Handler
|
|
}
|
|
|
|
func (o *http2ServeConnOpts) baseConfig() *Server {
|
|
if o != nil && o.BaseConfig != nil {
|
|
return o.BaseConfig
|
|
}
|
|
return new(Server)
|
|
}
|
|
|
|
func (o *http2ServeConnOpts) handler() Handler {
|
|
if o != nil {
|
|
if o.Handler != nil {
|
|
return o.Handler
|
|
}
|
|
if o.BaseConfig != nil && o.BaseConfig.Handler != nil {
|
|
return o.BaseConfig.Handler
|
|
}
|
|
}
|
|
return DefaultServeMux
|
|
}
|
|
|
|
// ServeConn serves HTTP/2 requests on the provided connection and
|
|
// blocks until the connection is no longer readable.
|
|
//
|
|
// ServeConn starts speaking HTTP/2 assuming that c has not had any
|
|
// reads or writes. It writes its initial settings frame and expects
|
|
// to be able to read the preface and settings frame from the
|
|
// client. If c has a ConnectionState method like a *tls.Conn, the
|
|
// ConnectionState is used to verify the TLS ciphersuite and to set
|
|
// the Request.TLS field in Handlers.
|
|
//
|
|
// ServeConn does not support h2c by itself. Any h2c support must be
|
|
// implemented in terms of providing a suitably-behaving net.Conn.
|
|
//
|
|
// The opts parameter is optional. If nil, default values are used.
|
|
func (s *http2Server) ServeConn(c net.Conn, opts *http2ServeConnOpts) {
|
|
sc := &http2serverConn{
|
|
srv: s,
|
|
hs: opts.baseConfig(),
|
|
conn: c,
|
|
remoteAddrStr: c.RemoteAddr().String(),
|
|
bw: http2newBufferedWriter(c),
|
|
handler: opts.handler(),
|
|
streams: make(map[uint32]*http2stream),
|
|
readFrameCh: make(chan http2readFrameResult),
|
|
wantWriteFrameCh: make(chan http2frameWriteMsg, 8),
|
|
wroteFrameCh: make(chan http2frameWriteResult, 1),
|
|
bodyReadCh: make(chan http2bodyReadMsg),
|
|
doneServing: make(chan struct{}),
|
|
advMaxStreams: s.maxConcurrentStreams(),
|
|
writeSched: http2writeScheduler{
|
|
maxFrameSize: http2initialMaxFrameSize,
|
|
},
|
|
initialWindowSize: http2initialWindowSize,
|
|
headerTableSize: http2initialHeaderTableSize,
|
|
serveG: http2newGoroutineLock(),
|
|
pushEnabled: true,
|
|
}
|
|
sc.flow.add(http2initialWindowSize)
|
|
sc.inflow.add(http2initialWindowSize)
|
|
sc.hpackEncoder = hpack.NewEncoder(&sc.headerWriteBuf)
|
|
sc.hpackDecoder = hpack.NewDecoder(http2initialHeaderTableSize, nil)
|
|
sc.hpackDecoder.SetMaxStringLength(sc.maxHeaderStringLen())
|
|
|
|
fr := http2NewFramer(sc.bw, c)
|
|
fr.SetMaxReadFrameSize(s.maxReadFrameSize())
|
|
sc.framer = fr
|
|
|
|
if tc, ok := c.(http2connectionStater); ok {
|
|
sc.tlsState = new(tls.ConnectionState)
|
|
*sc.tlsState = tc.ConnectionState()
|
|
|
|
if sc.tlsState.Version < tls.VersionTLS12 {
|
|
sc.rejectConn(http2ErrCodeInadequateSecurity, "TLS version too low")
|
|
return
|
|
}
|
|
|
|
if sc.tlsState.ServerName == "" {
|
|
|
|
}
|
|
|
|
if !s.PermitProhibitedCipherSuites && http2isBadCipher(sc.tlsState.CipherSuite) {
|
|
|
|
sc.rejectConn(http2ErrCodeInadequateSecurity, fmt.Sprintf("Prohibited TLS 1.2 Cipher Suite: %x", sc.tlsState.CipherSuite))
|
|
return
|
|
}
|
|
}
|
|
|
|
if hook := http2testHookGetServerConn; hook != nil {
|
|
hook(sc)
|
|
}
|
|
sc.serve()
|
|
}
|
|
|
|
// isBadCipher reports whether the cipher is blacklisted by the HTTP/2 spec.
|
|
func http2isBadCipher(cipher uint16) bool {
|
|
switch cipher {
|
|
case tls.TLS_RSA_WITH_RC4_128_SHA,
|
|
tls.TLS_RSA_WITH_3DES_EDE_CBC_SHA,
|
|
tls.TLS_RSA_WITH_AES_128_CBC_SHA,
|
|
tls.TLS_RSA_WITH_AES_256_CBC_SHA,
|
|
tls.TLS_ECDHE_ECDSA_WITH_RC4_128_SHA,
|
|
tls.TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA,
|
|
tls.TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA,
|
|
tls.TLS_ECDHE_RSA_WITH_RC4_128_SHA,
|
|
tls.TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA,
|
|
tls.TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,
|
|
tls.TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA:
|
|
|
|
return true
|
|
default:
|
|
return false
|
|
}
|
|
}
|
|
|
|
func (sc *http2serverConn) rejectConn(err http2ErrCode, debug string) {
|
|
sc.vlogf("http2: server rejecting conn: %v, %s", err, debug)
|
|
|
|
sc.framer.WriteGoAway(0, err, []byte(debug))
|
|
sc.bw.Flush()
|
|
sc.conn.Close()
|
|
}
|
|
|
|
type http2serverConn struct {
|
|
// Immutable:
|
|
srv *http2Server
|
|
hs *Server
|
|
conn net.Conn
|
|
bw *http2bufferedWriter // writing to conn
|
|
handler Handler
|
|
framer *http2Framer
|
|
hpackDecoder *hpack.Decoder
|
|
doneServing chan struct{} // closed when serverConn.serve ends
|
|
readFrameCh chan http2readFrameResult // written by serverConn.readFrames
|
|
wantWriteFrameCh chan http2frameWriteMsg // from handlers -> serve
|
|
wroteFrameCh chan http2frameWriteResult // from writeFrameAsync -> serve, tickles more frame writes
|
|
bodyReadCh chan http2bodyReadMsg // from handlers -> serve
|
|
testHookCh chan func(int) // code to run on the serve loop
|
|
flow http2flow // conn-wide (not stream-specific) outbound flow control
|
|
inflow http2flow // conn-wide inbound flow control
|
|
tlsState *tls.ConnectionState // shared by all handlers, like net/http
|
|
remoteAddrStr string
|
|
|
|
// Everything following is owned by the serve loop; use serveG.check():
|
|
serveG http2goroutineLock // used to verify funcs are on serve()
|
|
pushEnabled bool
|
|
sawFirstSettings bool // got the initial SETTINGS frame after the preface
|
|
needToSendSettingsAck bool
|
|
unackedSettings int // how many SETTINGS have we sent without ACKs?
|
|
clientMaxStreams uint32 // SETTINGS_MAX_CONCURRENT_STREAMS from client (our PUSH_PROMISE limit)
|
|
advMaxStreams uint32 // our SETTINGS_MAX_CONCURRENT_STREAMS advertised the client
|
|
curOpenStreams uint32 // client's number of open streams
|
|
maxStreamID uint32 // max ever seen
|
|
streams map[uint32]*http2stream
|
|
initialWindowSize int32
|
|
headerTableSize uint32
|
|
peerMaxHeaderListSize uint32 // zero means unknown (default)
|
|
canonHeader map[string]string // http2-lower-case -> Go-Canonical-Case
|
|
req http2requestParam // non-zero while reading request headers
|
|
writingFrame bool // started write goroutine but haven't heard back on wroteFrameCh
|
|
needsFrameFlush bool // last frame write wasn't a flush
|
|
writeSched http2writeScheduler
|
|
inGoAway bool // we've started to or sent GOAWAY
|
|
needToSendGoAway bool // we need to schedule a GOAWAY frame write
|
|
goAwayCode http2ErrCode
|
|
shutdownTimerCh <-chan time.Time // nil until used
|
|
shutdownTimer *time.Timer // nil until used
|
|
|
|
// Owned by the writeFrameAsync goroutine:
|
|
headerWriteBuf bytes.Buffer
|
|
hpackEncoder *hpack.Encoder
|
|
}
|
|
|
|
func (sc *http2serverConn) maxHeaderStringLen() int {
|
|
v := sc.maxHeaderListSize()
|
|
if uint32(int(v)) == v {
|
|
return int(v)
|
|
}
|
|
|
|
return 0
|
|
}
|
|
|
|
func (sc *http2serverConn) maxHeaderListSize() uint32 {
|
|
n := sc.hs.MaxHeaderBytes
|
|
if n <= 0 {
|
|
n = DefaultMaxHeaderBytes
|
|
}
|
|
// http2's count is in a slightly different unit and includes 32 bytes per pair.
|
|
// So, take the net/http.Server value and pad it up a bit, assuming 10 headers.
|
|
const perFieldOverhead = 32 // per http2 spec
|
|
const typicalHeaders = 10 // conservative
|
|
return uint32(n + typicalHeaders*perFieldOverhead)
|
|
}
|
|
|
|
// requestParam is the state of the next request, initialized over
|
|
// potentially several frames HEADERS + zero or more CONTINUATION
|
|
// frames.
|
|
type http2requestParam struct {
|
|
// stream is non-nil if we're reading (HEADER or CONTINUATION)
|
|
// frames for a request (but not DATA).
|
|
stream *http2stream
|
|
header Header
|
|
method, path string
|
|
scheme, authority string
|
|
sawRegularHeader bool // saw a non-pseudo header already
|
|
invalidHeader bool // an invalid header was seen
|
|
headerListSize int64 // actually uint32, but easier math this way
|
|
}
|
|
|
|
// stream represents a stream. This is the minimal metadata needed by
|
|
// the serve goroutine. Most of the actual stream state is owned by
|
|
// the http.Handler's goroutine in the responseWriter. Because the
|
|
// responseWriter's responseWriterState is recycled at the end of a
|
|
// handler, this struct intentionally has no pointer to the
|
|
// *responseWriter{,State} itself, as the Handler ending nils out the
|
|
// responseWriter's state field.
|
|
type http2stream struct {
|
|
// immutable:
|
|
sc *http2serverConn
|
|
id uint32
|
|
body *http2pipe // non-nil if expecting DATA frames
|
|
cw http2closeWaiter // closed wait stream transitions to closed state
|
|
|
|
// owned by serverConn's serve loop:
|
|
bodyBytes int64 // body bytes seen so far
|
|
declBodyBytes int64 // or -1 if undeclared
|
|
flow http2flow // limits writing from Handler to client
|
|
inflow http2flow // what the client is allowed to POST/etc to us
|
|
parent *http2stream // or nil
|
|
numTrailerValues int64
|
|
weight uint8
|
|
state http2streamState
|
|
sentReset bool // only true once detached from streams map
|
|
gotReset bool // only true once detacted from streams map
|
|
gotTrailerHeader bool // HEADER frame for trailers was seen
|
|
|
|
trailer Header // accumulated trailers
|
|
reqTrailer Header // handler's Request.Trailer
|
|
}
|
|
|
|
func (sc *http2serverConn) Framer() *http2Framer { return sc.framer }
|
|
|
|
func (sc *http2serverConn) CloseConn() error { return sc.conn.Close() }
|
|
|
|
func (sc *http2serverConn) Flush() error { return sc.bw.Flush() }
|
|
|
|
func (sc *http2serverConn) HeaderEncoder() (*hpack.Encoder, *bytes.Buffer) {
|
|
return sc.hpackEncoder, &sc.headerWriteBuf
|
|
}
|
|
|
|
func (sc *http2serverConn) state(streamID uint32) (http2streamState, *http2stream) {
|
|
sc.serveG.check()
|
|
|
|
if st, ok := sc.streams[streamID]; ok {
|
|
return st.state, st
|
|
}
|
|
|
|
if streamID <= sc.maxStreamID {
|
|
return http2stateClosed, nil
|
|
}
|
|
return http2stateIdle, nil
|
|
}
|
|
|
|
// setConnState calls the net/http ConnState hook for this connection, if configured.
|
|
// Note that the net/http package does StateNew and StateClosed for us.
|
|
// There is currently no plan for StateHijacked or hijacking HTTP/2 connections.
|
|
func (sc *http2serverConn) setConnState(state ConnState) {
|
|
if sc.hs.ConnState != nil {
|
|
sc.hs.ConnState(sc.conn, state)
|
|
}
|
|
}
|
|
|
|
func (sc *http2serverConn) vlogf(format string, args ...interface{}) {
|
|
if http2VerboseLogs {
|
|
sc.logf(format, args...)
|
|
}
|
|
}
|
|
|
|
func (sc *http2serverConn) logf(format string, args ...interface{}) {
|
|
if lg := sc.hs.ErrorLog; lg != nil {
|
|
lg.Printf(format, args...)
|
|
} else {
|
|
log.Printf(format, args...)
|
|
}
|
|
}
|
|
|
|
// errno returns v's underlying uintptr, else 0.
|
|
//
|
|
// TODO: remove this helper function once http2 can use build
|
|
// tags. See comment in isClosedConnError.
|
|
func http2errno(v error) uintptr {
|
|
if rv := reflect.ValueOf(v); rv.Kind() == reflect.Uintptr {
|
|
return uintptr(rv.Uint())
|
|
}
|
|
return 0
|
|
}
|
|
|
|
// isClosedConnError reports whether err is an error from use of a closed
|
|
// network connection.
|
|
func http2isClosedConnError(err error) bool {
|
|
if err == nil {
|
|
return false
|
|
}
|
|
|
|
str := err.Error()
|
|
if strings.Contains(str, "use of closed network connection") {
|
|
return true
|
|
}
|
|
|
|
if runtime.GOOS == "windows" {
|
|
if oe, ok := err.(*net.OpError); ok && oe.Op == "read" {
|
|
if se, ok := oe.Err.(*os.SyscallError); ok && se.Syscall == "wsarecv" {
|
|
const WSAECONNABORTED = 10053
|
|
const WSAECONNRESET = 10054
|
|
if n := http2errno(se.Err); n == WSAECONNRESET || n == WSAECONNABORTED {
|
|
return true
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return false
|
|
}
|
|
|
|
func (sc *http2serverConn) condlogf(err error, format string, args ...interface{}) {
|
|
if err == nil {
|
|
return
|
|
}
|
|
if err == io.EOF || err == io.ErrUnexpectedEOF || http2isClosedConnError(err) {
|
|
|
|
sc.vlogf(format, args...)
|
|
} else {
|
|
sc.logf(format, args...)
|
|
}
|
|
}
|
|
|
|
func (sc *http2serverConn) onNewHeaderField(f hpack.HeaderField) {
|
|
sc.serveG.check()
|
|
if http2VerboseLogs {
|
|
sc.vlogf("http2: server decoded %v", f)
|
|
}
|
|
switch {
|
|
case !http2validHeaderFieldValue(f.Value):
|
|
sc.req.invalidHeader = true
|
|
case strings.HasPrefix(f.Name, ":"):
|
|
if sc.req.sawRegularHeader {
|
|
sc.logf("pseudo-header after regular header")
|
|
sc.req.invalidHeader = true
|
|
return
|
|
}
|
|
var dst *string
|
|
switch f.Name {
|
|
case ":method":
|
|
dst = &sc.req.method
|
|
case ":path":
|
|
dst = &sc.req.path
|
|
case ":scheme":
|
|
dst = &sc.req.scheme
|
|
case ":authority":
|
|
dst = &sc.req.authority
|
|
default:
|
|
|
|
sc.logf("invalid pseudo-header %q", f.Name)
|
|
sc.req.invalidHeader = true
|
|
return
|
|
}
|
|
if *dst != "" {
|
|
sc.logf("duplicate pseudo-header %q sent", f.Name)
|
|
sc.req.invalidHeader = true
|
|
return
|
|
}
|
|
*dst = f.Value
|
|
case !http2validHeaderFieldName(f.Name):
|
|
sc.req.invalidHeader = true
|
|
default:
|
|
sc.req.sawRegularHeader = true
|
|
sc.req.header.Add(sc.canonicalHeader(f.Name), f.Value)
|
|
const headerFieldOverhead = 32 // per spec
|
|
sc.req.headerListSize += int64(len(f.Name)) + int64(len(f.Value)) + headerFieldOverhead
|
|
if sc.req.headerListSize > int64(sc.maxHeaderListSize()) {
|
|
sc.hpackDecoder.SetEmitEnabled(false)
|
|
}
|
|
}
|
|
}
|
|
|
|
func (st *http2stream) onNewTrailerField(f hpack.HeaderField) {
|
|
sc := st.sc
|
|
sc.serveG.check()
|
|
if http2VerboseLogs {
|
|
sc.vlogf("http2: server decoded trailer %v", f)
|
|
}
|
|
switch {
|
|
case strings.HasPrefix(f.Name, ":"):
|
|
sc.req.invalidHeader = true
|
|
return
|
|
case !http2validHeaderFieldName(f.Name) || !http2validHeaderFieldValue(f.Value):
|
|
sc.req.invalidHeader = true
|
|
return
|
|
default:
|
|
key := sc.canonicalHeader(f.Name)
|
|
if st.trailer != nil {
|
|
vv := append(st.trailer[key], f.Value)
|
|
st.trailer[key] = vv
|
|
|
|
// arbitrary; TODO: read spec about header list size limits wrt trailers
|
|
const tooBig = 1000
|
|
if len(vv) >= tooBig {
|
|
sc.hpackDecoder.SetEmitEnabled(false)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
func (sc *http2serverConn) canonicalHeader(v string) string {
|
|
sc.serveG.check()
|
|
cv, ok := http2commonCanonHeader[v]
|
|
if ok {
|
|
return cv
|
|
}
|
|
cv, ok = sc.canonHeader[v]
|
|
if ok {
|
|
return cv
|
|
}
|
|
if sc.canonHeader == nil {
|
|
sc.canonHeader = make(map[string]string)
|
|
}
|
|
cv = CanonicalHeaderKey(v)
|
|
sc.canonHeader[v] = cv
|
|
return cv
|
|
}
|
|
|
|
type http2readFrameResult struct {
|
|
f http2Frame // valid until readMore is called
|
|
err error
|
|
|
|
// readMore should be called once the consumer no longer needs or
|
|
// retains f. After readMore, f is invalid and more frames can be
|
|
// read.
|
|
readMore func()
|
|
}
|
|
|
|
// readFrames is the loop that reads incoming frames.
|
|
// It takes care to only read one frame at a time, blocking until the
|
|
// consumer is done with the frame.
|
|
// It's run on its own goroutine.
|
|
func (sc *http2serverConn) readFrames() {
|
|
gate := make(http2gate)
|
|
for {
|
|
f, err := sc.framer.ReadFrame()
|
|
select {
|
|
case sc.readFrameCh <- http2readFrameResult{f, err, gate.Done}:
|
|
case <-sc.doneServing:
|
|
return
|
|
}
|
|
select {
|
|
case <-gate:
|
|
case <-sc.doneServing:
|
|
return
|
|
}
|
|
if http2terminalReadFrameError(err) {
|
|
return
|
|
}
|
|
}
|
|
}
|
|
|
|
// frameWriteResult is the message passed from writeFrameAsync to the serve goroutine.
|
|
type http2frameWriteResult struct {
|
|
wm http2frameWriteMsg // what was written (or attempted)
|
|
err error // result of the writeFrame call
|
|
}
|
|
|
|
// writeFrameAsync runs in its own goroutine and writes a single frame
|
|
// and then reports when it's done.
|
|
// At most one goroutine can be running writeFrameAsync at a time per
|
|
// serverConn.
|
|
func (sc *http2serverConn) writeFrameAsync(wm http2frameWriteMsg) {
|
|
err := wm.write.writeFrame(sc)
|
|
sc.wroteFrameCh <- http2frameWriteResult{wm, err}
|
|
}
|
|
|
|
func (sc *http2serverConn) closeAllStreamsOnConnClose() {
|
|
sc.serveG.check()
|
|
for _, st := range sc.streams {
|
|
sc.closeStream(st, http2errClientDisconnected)
|
|
}
|
|
}
|
|
|
|
func (sc *http2serverConn) stopShutdownTimer() {
|
|
sc.serveG.check()
|
|
if t := sc.shutdownTimer; t != nil {
|
|
t.Stop()
|
|
}
|
|
}
|
|
|
|
func (sc *http2serverConn) notePanic() {
|
|
|
|
if http2testHookOnPanicMu != nil {
|
|
http2testHookOnPanicMu.Lock()
|
|
defer http2testHookOnPanicMu.Unlock()
|
|
}
|
|
if http2testHookOnPanic != nil {
|
|
if e := recover(); e != nil {
|
|
if http2testHookOnPanic(sc, e) {
|
|
panic(e)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
func (sc *http2serverConn) serve() {
|
|
sc.serveG.check()
|
|
defer sc.notePanic()
|
|
defer sc.conn.Close()
|
|
defer sc.closeAllStreamsOnConnClose()
|
|
defer sc.stopShutdownTimer()
|
|
defer close(sc.doneServing)
|
|
|
|
if http2VerboseLogs {
|
|
sc.vlogf("http2: server connection from %v on %p", sc.conn.RemoteAddr(), sc.hs)
|
|
}
|
|
|
|
sc.writeFrame(http2frameWriteMsg{
|
|
write: http2writeSettings{
|
|
{http2SettingMaxFrameSize, sc.srv.maxReadFrameSize()},
|
|
{http2SettingMaxConcurrentStreams, sc.advMaxStreams},
|
|
{http2SettingMaxHeaderListSize, sc.maxHeaderListSize()},
|
|
},
|
|
})
|
|
sc.unackedSettings++
|
|
|
|
if err := sc.readPreface(); err != nil {
|
|
sc.condlogf(err, "http2: server: error reading preface from client %v: %v", sc.conn.RemoteAddr(), err)
|
|
return
|
|
}
|
|
|
|
sc.setConnState(StateActive)
|
|
sc.setConnState(StateIdle)
|
|
|
|
go sc.readFrames()
|
|
|
|
settingsTimer := time.NewTimer(http2firstSettingsTimeout)
|
|
loopNum := 0
|
|
for {
|
|
loopNum++
|
|
select {
|
|
case wm := <-sc.wantWriteFrameCh:
|
|
sc.writeFrame(wm)
|
|
case res := <-sc.wroteFrameCh:
|
|
sc.wroteFrame(res)
|
|
case res := <-sc.readFrameCh:
|
|
if !sc.processFrameFromReader(res) {
|
|
return
|
|
}
|
|
res.readMore()
|
|
if settingsTimer.C != nil {
|
|
settingsTimer.Stop()
|
|
settingsTimer.C = nil
|
|
}
|
|
case m := <-sc.bodyReadCh:
|
|
sc.noteBodyRead(m.st, m.n)
|
|
case <-settingsTimer.C:
|
|
sc.logf("timeout waiting for SETTINGS frames from %v", sc.conn.RemoteAddr())
|
|
return
|
|
case <-sc.shutdownTimerCh:
|
|
sc.vlogf("GOAWAY close timer fired; closing conn from %v", sc.conn.RemoteAddr())
|
|
return
|
|
case fn := <-sc.testHookCh:
|
|
fn(loopNum)
|
|
}
|
|
}
|
|
}
|
|
|
|
// readPreface reads the ClientPreface greeting from the peer
|
|
// or returns an error on timeout or an invalid greeting.
|
|
func (sc *http2serverConn) readPreface() error {
|
|
errc := make(chan error, 1)
|
|
go func() {
|
|
|
|
buf := make([]byte, len(http2ClientPreface))
|
|
if _, err := io.ReadFull(sc.conn, buf); err != nil {
|
|
errc <- err
|
|
} else if !bytes.Equal(buf, http2clientPreface) {
|
|
errc <- fmt.Errorf("bogus greeting %q", buf)
|
|
} else {
|
|
errc <- nil
|
|
}
|
|
}()
|
|
timer := time.NewTimer(http2prefaceTimeout)
|
|
defer timer.Stop()
|
|
select {
|
|
case <-timer.C:
|
|
return errors.New("timeout waiting for client preface")
|
|
case err := <-errc:
|
|
if err == nil {
|
|
if http2VerboseLogs {
|
|
sc.vlogf("http2: server: client %v said hello", sc.conn.RemoteAddr())
|
|
}
|
|
}
|
|
return err
|
|
}
|
|
}
|
|
|
|
var http2errChanPool = sync.Pool{
|
|
New: func() interface{} { return make(chan error, 1) },
|
|
}
|
|
|
|
var http2writeDataPool = sync.Pool{
|
|
New: func() interface{} { return new(http2writeData) },
|
|
}
|
|
|
|
// writeDataFromHandler writes DATA response frames from a handler on
|
|
// the given stream.
|
|
func (sc *http2serverConn) writeDataFromHandler(stream *http2stream, data []byte, endStream bool) error {
|
|
ch := http2errChanPool.Get().(chan error)
|
|
writeArg := http2writeDataPool.Get().(*http2writeData)
|
|
*writeArg = http2writeData{stream.id, data, endStream}
|
|
err := sc.writeFrameFromHandler(http2frameWriteMsg{
|
|
write: writeArg,
|
|
stream: stream,
|
|
done: ch,
|
|
})
|
|
if err != nil {
|
|
return err
|
|
}
|
|
var frameWriteDone bool // the frame write is done (successfully or not)
|
|
select {
|
|
case err = <-ch:
|
|
frameWriteDone = true
|
|
case <-sc.doneServing:
|
|
return http2errClientDisconnected
|
|
case <-stream.cw:
|
|
|
|
select {
|
|
case err = <-ch:
|
|
frameWriteDone = true
|
|
default:
|
|
return http2errStreamClosed
|
|
}
|
|
}
|
|
http2errChanPool.Put(ch)
|
|
if frameWriteDone {
|
|
http2writeDataPool.Put(writeArg)
|
|
}
|
|
return err
|
|
}
|
|
|
|
// writeFrameFromHandler sends wm to sc.wantWriteFrameCh, but aborts
|
|
// if the connection has gone away.
|
|
//
|
|
// This must not be run from the serve goroutine itself, else it might
|
|
// deadlock writing to sc.wantWriteFrameCh (which is only mildly
|
|
// buffered and is read by serve itself). If you're on the serve
|
|
// goroutine, call writeFrame instead.
|
|
func (sc *http2serverConn) writeFrameFromHandler(wm http2frameWriteMsg) error {
|
|
sc.serveG.checkNotOn()
|
|
select {
|
|
case sc.wantWriteFrameCh <- wm:
|
|
return nil
|
|
case <-sc.doneServing:
|
|
|
|
return http2errClientDisconnected
|
|
}
|
|
}
|
|
|
|
// writeFrame schedules a frame to write and sends it if there's nothing
|
|
// already being written.
|
|
//
|
|
// There is no pushback here (the serve goroutine never blocks). It's
|
|
// the http.Handlers that block, waiting for their previous frames to
|
|
// make it onto the wire
|
|
//
|
|
// If you're not on the serve goroutine, use writeFrameFromHandler instead.
|
|
func (sc *http2serverConn) writeFrame(wm http2frameWriteMsg) {
|
|
sc.serveG.check()
|
|
sc.writeSched.add(wm)
|
|
sc.scheduleFrameWrite()
|
|
}
|
|
|
|
// startFrameWrite starts a goroutine to write wm (in a separate
|
|
// goroutine since that might block on the network), and updates the
|
|
// serve goroutine's state about the world, updated from info in wm.
|
|
func (sc *http2serverConn) startFrameWrite(wm http2frameWriteMsg) {
|
|
sc.serveG.check()
|
|
if sc.writingFrame {
|
|
panic("internal error: can only be writing one frame at a time")
|
|
}
|
|
|
|
st := wm.stream
|
|
if st != nil {
|
|
switch st.state {
|
|
case http2stateHalfClosedLocal:
|
|
panic("internal error: attempt to send frame on half-closed-local stream")
|
|
case http2stateClosed:
|
|
if st.sentReset || st.gotReset {
|
|
|
|
sc.scheduleFrameWrite()
|
|
return
|
|
}
|
|
panic(fmt.Sprintf("internal error: attempt to send a write %v on a closed stream", wm))
|
|
}
|
|
}
|
|
|
|
sc.writingFrame = true
|
|
sc.needsFrameFlush = true
|
|
go sc.writeFrameAsync(wm)
|
|
}
|
|
|
|
// errHandlerPanicked is the error given to any callers blocked in a read from
|
|
// Request.Body when the main goroutine panics. Since most handlers read in the
|
|
// the main ServeHTTP goroutine, this will show up rarely.
|
|
var http2errHandlerPanicked = errors.New("http2: handler panicked")
|
|
|
|
// wroteFrame is called on the serve goroutine with the result of
|
|
// whatever happened on writeFrameAsync.
|
|
func (sc *http2serverConn) wroteFrame(res http2frameWriteResult) {
|
|
sc.serveG.check()
|
|
if !sc.writingFrame {
|
|
panic("internal error: expected to be already writing a frame")
|
|
}
|
|
sc.writingFrame = false
|
|
|
|
wm := res.wm
|
|
st := wm.stream
|
|
|
|
closeStream := http2endsStream(wm.write)
|
|
|
|
if _, ok := wm.write.(http2handlerPanicRST); ok {
|
|
sc.closeStream(st, http2errHandlerPanicked)
|
|
}
|
|
|
|
if ch := wm.done; ch != nil {
|
|
select {
|
|
case ch <- res.err:
|
|
default:
|
|
panic(fmt.Sprintf("unbuffered done channel passed in for type %T", wm.write))
|
|
}
|
|
}
|
|
wm.write = nil
|
|
|
|
if closeStream {
|
|
if st == nil {
|
|
panic("internal error: expecting non-nil stream")
|
|
}
|
|
switch st.state {
|
|
case http2stateOpen:
|
|
|
|
st.state = http2stateHalfClosedLocal
|
|
errCancel := http2StreamError{st.id, http2ErrCodeCancel}
|
|
sc.resetStream(errCancel)
|
|
case http2stateHalfClosedRemote:
|
|
sc.closeStream(st, http2errHandlerComplete)
|
|
}
|
|
}
|
|
|
|
sc.scheduleFrameWrite()
|
|
}
|
|
|
|
// scheduleFrameWrite tickles the frame writing scheduler.
|
|
//
|
|
// If a frame is already being written, nothing happens. This will be called again
|
|
// when the frame is done being written.
|
|
//
|
|
// If a frame isn't being written we need to send one, the best frame
|
|
// to send is selected, preferring first things that aren't
|
|
// stream-specific (e.g. ACKing settings), and then finding the
|
|
// highest priority stream.
|
|
//
|
|
// If a frame isn't being written and there's nothing else to send, we
|
|
// flush the write buffer.
|
|
func (sc *http2serverConn) scheduleFrameWrite() {
|
|
sc.serveG.check()
|
|
if sc.writingFrame {
|
|
return
|
|
}
|
|
if sc.needToSendGoAway {
|
|
sc.needToSendGoAway = false
|
|
sc.startFrameWrite(http2frameWriteMsg{
|
|
write: &http2writeGoAway{
|
|
maxStreamID: sc.maxStreamID,
|
|
code: sc.goAwayCode,
|
|
},
|
|
})
|
|
return
|
|
}
|
|
if sc.needToSendSettingsAck {
|
|
sc.needToSendSettingsAck = false
|
|
sc.startFrameWrite(http2frameWriteMsg{write: http2writeSettingsAck{}})
|
|
return
|
|
}
|
|
if !sc.inGoAway {
|
|
if wm, ok := sc.writeSched.take(); ok {
|
|
sc.startFrameWrite(wm)
|
|
return
|
|
}
|
|
}
|
|
if sc.needsFrameFlush {
|
|
sc.startFrameWrite(http2frameWriteMsg{write: http2flushFrameWriter{}})
|
|
sc.needsFrameFlush = false
|
|
return
|
|
}
|
|
}
|
|
|
|
func (sc *http2serverConn) goAway(code http2ErrCode) {
|
|
sc.serveG.check()
|
|
if sc.inGoAway {
|
|
return
|
|
}
|
|
if code != http2ErrCodeNo {
|
|
sc.shutDownIn(250 * time.Millisecond)
|
|
} else {
|
|
|
|
sc.shutDownIn(1 * time.Second)
|
|
}
|
|
sc.inGoAway = true
|
|
sc.needToSendGoAway = true
|
|
sc.goAwayCode = code
|
|
sc.scheduleFrameWrite()
|
|
}
|
|
|
|
func (sc *http2serverConn) shutDownIn(d time.Duration) {
|
|
sc.serveG.check()
|
|
sc.shutdownTimer = time.NewTimer(d)
|
|
sc.shutdownTimerCh = sc.shutdownTimer.C
|
|
}
|
|
|
|
func (sc *http2serverConn) resetStream(se http2StreamError) {
|
|
sc.serveG.check()
|
|
sc.writeFrame(http2frameWriteMsg{write: se})
|
|
if st, ok := sc.streams[se.StreamID]; ok {
|
|
st.sentReset = true
|
|
sc.closeStream(st, se)
|
|
}
|
|
}
|
|
|
|
// processFrameFromReader processes the serve loop's read from readFrameCh from the
|
|
// frame-reading goroutine.
|
|
// processFrameFromReader returns whether the connection should be kept open.
|
|
func (sc *http2serverConn) processFrameFromReader(res http2readFrameResult) bool {
|
|
sc.serveG.check()
|
|
err := res.err
|
|
if err != nil {
|
|
if err == http2ErrFrameTooLarge {
|
|
sc.goAway(http2ErrCodeFrameSize)
|
|
return true
|
|
}
|
|
clientGone := err == io.EOF || err == io.ErrUnexpectedEOF || http2isClosedConnError(err)
|
|
if clientGone {
|
|
|
|
return false
|
|
}
|
|
} else {
|
|
f := res.f
|
|
if http2VerboseLogs {
|
|
sc.vlogf("http2: server read frame %v", http2summarizeFrame(f))
|
|
}
|
|
err = sc.processFrame(f)
|
|
if err == nil {
|
|
return true
|
|
}
|
|
}
|
|
|
|
switch ev := err.(type) {
|
|
case http2StreamError:
|
|
sc.resetStream(ev)
|
|
return true
|
|
case http2goAwayFlowError:
|
|
sc.goAway(http2ErrCodeFlowControl)
|
|
return true
|
|
case http2ConnectionError:
|
|
sc.logf("http2: server connection error from %v: %v", sc.conn.RemoteAddr(), ev)
|
|
sc.goAway(http2ErrCode(ev))
|
|
return true
|
|
default:
|
|
if res.err != nil {
|
|
sc.vlogf("http2: server closing client connection; error reading frame from client %s: %v", sc.conn.RemoteAddr(), err)
|
|
} else {
|
|
sc.logf("http2: server closing client connection: %v", err)
|
|
}
|
|
return false
|
|
}
|
|
}
|
|
|
|
func (sc *http2serverConn) processFrame(f http2Frame) error {
|
|
sc.serveG.check()
|
|
|
|
if !sc.sawFirstSettings {
|
|
if _, ok := f.(*http2SettingsFrame); !ok {
|
|
return http2ConnectionError(http2ErrCodeProtocol)
|
|
}
|
|
sc.sawFirstSettings = true
|
|
}
|
|
|
|
switch f := f.(type) {
|
|
case *http2SettingsFrame:
|
|
return sc.processSettings(f)
|
|
case *http2HeadersFrame:
|
|
return sc.processHeaders(f)
|
|
case *http2ContinuationFrame:
|
|
return sc.processContinuation(f)
|
|
case *http2WindowUpdateFrame:
|
|
return sc.processWindowUpdate(f)
|
|
case *http2PingFrame:
|
|
return sc.processPing(f)
|
|
case *http2DataFrame:
|
|
return sc.processData(f)
|
|
case *http2RSTStreamFrame:
|
|
return sc.processResetStream(f)
|
|
case *http2PriorityFrame:
|
|
return sc.processPriority(f)
|
|
case *http2PushPromiseFrame:
|
|
|
|
return http2ConnectionError(http2ErrCodeProtocol)
|
|
default:
|
|
sc.vlogf("http2: server ignoring frame: %v", f.Header())
|
|
return nil
|
|
}
|
|
}
|
|
|
|
func (sc *http2serverConn) processPing(f *http2PingFrame) error {
|
|
sc.serveG.check()
|
|
if f.IsAck() {
|
|
|
|
return nil
|
|
}
|
|
if f.StreamID != 0 {
|
|
|
|
return http2ConnectionError(http2ErrCodeProtocol)
|
|
}
|
|
sc.writeFrame(http2frameWriteMsg{write: http2writePingAck{f}})
|
|
return nil
|
|
}
|
|
|
|
func (sc *http2serverConn) processWindowUpdate(f *http2WindowUpdateFrame) error {
|
|
sc.serveG.check()
|
|
switch {
|
|
case f.StreamID != 0:
|
|
st := sc.streams[f.StreamID]
|
|
if st == nil {
|
|
|
|
return nil
|
|
}
|
|
if !st.flow.add(int32(f.Increment)) {
|
|
return http2StreamError{f.StreamID, http2ErrCodeFlowControl}
|
|
}
|
|
default:
|
|
if !sc.flow.add(int32(f.Increment)) {
|
|
return http2goAwayFlowError{}
|
|
}
|
|
}
|
|
sc.scheduleFrameWrite()
|
|
return nil
|
|
}
|
|
|
|
func (sc *http2serverConn) processResetStream(f *http2RSTStreamFrame) error {
|
|
sc.serveG.check()
|
|
|
|
state, st := sc.state(f.StreamID)
|
|
if state == http2stateIdle {
|
|
|
|
return http2ConnectionError(http2ErrCodeProtocol)
|
|
}
|
|
if st != nil {
|
|
st.gotReset = true
|
|
sc.closeStream(st, http2StreamError{f.StreamID, f.ErrCode})
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (sc *http2serverConn) closeStream(st *http2stream, err error) {
|
|
sc.serveG.check()
|
|
if st.state == http2stateIdle || st.state == http2stateClosed {
|
|
panic(fmt.Sprintf("invariant; can't close stream in state %v", st.state))
|
|
}
|
|
st.state = http2stateClosed
|
|
sc.curOpenStreams--
|
|
if sc.curOpenStreams == 0 {
|
|
sc.setConnState(StateIdle)
|
|
}
|
|
delete(sc.streams, st.id)
|
|
if p := st.body; p != nil {
|
|
p.CloseWithError(err)
|
|
}
|
|
st.cw.Close()
|
|
sc.writeSched.forgetStream(st.id)
|
|
}
|
|
|
|
func (sc *http2serverConn) processSettings(f *http2SettingsFrame) error {
|
|
sc.serveG.check()
|
|
if f.IsAck() {
|
|
sc.unackedSettings--
|
|
if sc.unackedSettings < 0 {
|
|
|
|
return http2ConnectionError(http2ErrCodeProtocol)
|
|
}
|
|
return nil
|
|
}
|
|
if err := f.ForeachSetting(sc.processSetting); err != nil {
|
|
return err
|
|
}
|
|
sc.needToSendSettingsAck = true
|
|
sc.scheduleFrameWrite()
|
|
return nil
|
|
}
|
|
|
|
func (sc *http2serverConn) processSetting(s http2Setting) error {
|
|
sc.serveG.check()
|
|
if err := s.Valid(); err != nil {
|
|
return err
|
|
}
|
|
if http2VerboseLogs {
|
|
sc.vlogf("http2: server processing setting %v", s)
|
|
}
|
|
switch s.ID {
|
|
case http2SettingHeaderTableSize:
|
|
sc.headerTableSize = s.Val
|
|
sc.hpackEncoder.SetMaxDynamicTableSize(s.Val)
|
|
case http2SettingEnablePush:
|
|
sc.pushEnabled = s.Val != 0
|
|
case http2SettingMaxConcurrentStreams:
|
|
sc.clientMaxStreams = s.Val
|
|
case http2SettingInitialWindowSize:
|
|
return sc.processSettingInitialWindowSize(s.Val)
|
|
case http2SettingMaxFrameSize:
|
|
sc.writeSched.maxFrameSize = s.Val
|
|
case http2SettingMaxHeaderListSize:
|
|
sc.peerMaxHeaderListSize = s.Val
|
|
default:
|
|
|
|
if http2VerboseLogs {
|
|
sc.vlogf("http2: server ignoring unknown setting %v", s)
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (sc *http2serverConn) processSettingInitialWindowSize(val uint32) error {
|
|
sc.serveG.check()
|
|
|
|
old := sc.initialWindowSize
|
|
sc.initialWindowSize = int32(val)
|
|
growth := sc.initialWindowSize - old
|
|
for _, st := range sc.streams {
|
|
if !st.flow.add(growth) {
|
|
|
|
return http2ConnectionError(http2ErrCodeFlowControl)
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (sc *http2serverConn) processData(f *http2DataFrame) error {
|
|
sc.serveG.check()
|
|
|
|
id := f.Header().StreamID
|
|
st, ok := sc.streams[id]
|
|
if !ok || st.state != http2stateOpen || st.gotTrailerHeader {
|
|
|
|
return http2StreamError{id, http2ErrCodeStreamClosed}
|
|
}
|
|
if st.body == nil {
|
|
panic("internal error: should have a body in this state")
|
|
}
|
|
data := f.Data()
|
|
|
|
if st.declBodyBytes != -1 && st.bodyBytes+int64(len(data)) > st.declBodyBytes {
|
|
st.body.CloseWithError(fmt.Errorf("sender tried to send more than declared Content-Length of %d bytes", st.declBodyBytes))
|
|
return http2StreamError{id, http2ErrCodeStreamClosed}
|
|
}
|
|
if len(data) > 0 {
|
|
|
|
if int(st.inflow.available()) < len(data) {
|
|
return http2StreamError{id, http2ErrCodeFlowControl}
|
|
}
|
|
st.inflow.take(int32(len(data)))
|
|
wrote, err := st.body.Write(data)
|
|
if err != nil {
|
|
return http2StreamError{id, http2ErrCodeStreamClosed}
|
|
}
|
|
if wrote != len(data) {
|
|
panic("internal error: bad Writer")
|
|
}
|
|
st.bodyBytes += int64(len(data))
|
|
}
|
|
if f.StreamEnded() {
|
|
st.endStream()
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// endStream closes a Request.Body's pipe. It is called when a DATA
|
|
// frame says a request body is over (or after trailers).
|
|
func (st *http2stream) endStream() {
|
|
sc := st.sc
|
|
sc.serveG.check()
|
|
|
|
if st.declBodyBytes != -1 && st.declBodyBytes != st.bodyBytes {
|
|
st.body.CloseWithError(fmt.Errorf("request declared a Content-Length of %d but only wrote %d bytes",
|
|
st.declBodyBytes, st.bodyBytes))
|
|
} else {
|
|
st.body.closeWithErrorAndCode(io.EOF, st.copyTrailersToHandlerRequest)
|
|
st.body.CloseWithError(io.EOF)
|
|
}
|
|
st.state = http2stateHalfClosedRemote
|
|
}
|
|
|
|
// copyTrailersToHandlerRequest is run in the Handler's goroutine in
|
|
// its Request.Body.Read just before it gets io.EOF.
|
|
func (st *http2stream) copyTrailersToHandlerRequest() {
|
|
for k, vv := range st.trailer {
|
|
if _, ok := st.reqTrailer[k]; ok {
|
|
|
|
st.reqTrailer[k] = vv
|
|
}
|
|
}
|
|
}
|
|
|
|
func (sc *http2serverConn) processHeaders(f *http2HeadersFrame) error {
|
|
sc.serveG.check()
|
|
id := f.Header().StreamID
|
|
if sc.inGoAway {
|
|
|
|
return nil
|
|
}
|
|
|
|
if id%2 != 1 {
|
|
return http2ConnectionError(http2ErrCodeProtocol)
|
|
}
|
|
|
|
st := sc.streams[f.Header().StreamID]
|
|
if st != nil {
|
|
return st.processTrailerHeaders(f)
|
|
}
|
|
|
|
if id <= sc.maxStreamID || sc.req.stream != nil {
|
|
return http2ConnectionError(http2ErrCodeProtocol)
|
|
}
|
|
|
|
if id > sc.maxStreamID {
|
|
sc.maxStreamID = id
|
|
}
|
|
st = &http2stream{
|
|
sc: sc,
|
|
id: id,
|
|
state: http2stateOpen,
|
|
}
|
|
if f.StreamEnded() {
|
|
st.state = http2stateHalfClosedRemote
|
|
}
|
|
st.cw.Init()
|
|
|
|
st.flow.conn = &sc.flow
|
|
st.flow.add(sc.initialWindowSize)
|
|
st.inflow.conn = &sc.inflow
|
|
st.inflow.add(http2initialWindowSize)
|
|
|
|
sc.streams[id] = st
|
|
if f.HasPriority() {
|
|
http2adjustStreamPriority(sc.streams, st.id, f.Priority)
|
|
}
|
|
sc.curOpenStreams++
|
|
if sc.curOpenStreams == 1 {
|
|
sc.setConnState(StateActive)
|
|
}
|
|
sc.req = http2requestParam{
|
|
stream: st,
|
|
header: make(Header),
|
|
}
|
|
sc.hpackDecoder.SetEmitFunc(sc.onNewHeaderField)
|
|
sc.hpackDecoder.SetEmitEnabled(true)
|
|
return sc.processHeaderBlockFragment(st, f.HeaderBlockFragment(), f.HeadersEnded())
|
|
}
|
|
|
|
func (st *http2stream) processTrailerHeaders(f *http2HeadersFrame) error {
|
|
sc := st.sc
|
|
sc.serveG.check()
|
|
if st.gotTrailerHeader {
|
|
return http2ConnectionError(http2ErrCodeProtocol)
|
|
}
|
|
st.gotTrailerHeader = true
|
|
if !f.StreamEnded() {
|
|
return http2StreamError{st.id, http2ErrCodeProtocol}
|
|
}
|
|
sc.resetPendingRequest()
|
|
return st.processTrailerHeaderBlockFragment(f.HeaderBlockFragment(), f.HeadersEnded())
|
|
}
|
|
|
|
func (sc *http2serverConn) processContinuation(f *http2ContinuationFrame) error {
|
|
sc.serveG.check()
|
|
st := sc.streams[f.Header().StreamID]
|
|
if st.gotTrailerHeader {
|
|
return st.processTrailerHeaderBlockFragment(f.HeaderBlockFragment(), f.HeadersEnded())
|
|
}
|
|
return sc.processHeaderBlockFragment(st, f.HeaderBlockFragment(), f.HeadersEnded())
|
|
}
|
|
|
|
func (sc *http2serverConn) processHeaderBlockFragment(st *http2stream, frag []byte, end bool) error {
|
|
sc.serveG.check()
|
|
if _, err := sc.hpackDecoder.Write(frag); err != nil {
|
|
return http2ConnectionError(http2ErrCodeCompression)
|
|
}
|
|
if !end {
|
|
return nil
|
|
}
|
|
if err := sc.hpackDecoder.Close(); err != nil {
|
|
return http2ConnectionError(http2ErrCodeCompression)
|
|
}
|
|
defer sc.resetPendingRequest()
|
|
if sc.curOpenStreams > sc.advMaxStreams {
|
|
|
|
if sc.unackedSettings == 0 {
|
|
|
|
return http2StreamError{st.id, http2ErrCodeProtocol}
|
|
}
|
|
|
|
return http2StreamError{st.id, http2ErrCodeRefusedStream}
|
|
}
|
|
|
|
rw, req, err := sc.newWriterAndRequest()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
st.reqTrailer = req.Trailer
|
|
if st.reqTrailer != nil {
|
|
st.trailer = make(Header)
|
|
}
|
|
st.body = req.Body.(*http2requestBody).pipe
|
|
st.declBodyBytes = req.ContentLength
|
|
|
|
handler := sc.handler.ServeHTTP
|
|
if !sc.hpackDecoder.EmitEnabled() {
|
|
|
|
handler = http2handleHeaderListTooLong
|
|
}
|
|
|
|
go sc.runHandler(rw, req, handler)
|
|
return nil
|
|
}
|
|
|
|
func (st *http2stream) processTrailerHeaderBlockFragment(frag []byte, end bool) error {
|
|
sc := st.sc
|
|
sc.serveG.check()
|
|
sc.hpackDecoder.SetEmitFunc(st.onNewTrailerField)
|
|
if _, err := sc.hpackDecoder.Write(frag); err != nil {
|
|
return http2ConnectionError(http2ErrCodeCompression)
|
|
}
|
|
if !end {
|
|
return nil
|
|
}
|
|
|
|
rp := &sc.req
|
|
if rp.invalidHeader {
|
|
return http2StreamError{rp.stream.id, http2ErrCodeProtocol}
|
|
}
|
|
|
|
err := sc.hpackDecoder.Close()
|
|
st.endStream()
|
|
if err != nil {
|
|
return http2ConnectionError(http2ErrCodeCompression)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (sc *http2serverConn) processPriority(f *http2PriorityFrame) error {
|
|
http2adjustStreamPriority(sc.streams, f.StreamID, f.http2PriorityParam)
|
|
return nil
|
|
}
|
|
|
|
func http2adjustStreamPriority(streams map[uint32]*http2stream, streamID uint32, priority http2PriorityParam) {
|
|
st, ok := streams[streamID]
|
|
if !ok {
|
|
|
|
return
|
|
}
|
|
st.weight = priority.Weight
|
|
parent := streams[priority.StreamDep]
|
|
if parent == st {
|
|
|
|
return
|
|
}
|
|
|
|
for piter := parent; piter != nil; piter = piter.parent {
|
|
if piter == st {
|
|
parent.parent = st.parent
|
|
break
|
|
}
|
|
}
|
|
st.parent = parent
|
|
if priority.Exclusive && (st.parent != nil || priority.StreamDep == 0) {
|
|
for _, openStream := range streams {
|
|
if openStream != st && openStream.parent == st.parent {
|
|
openStream.parent = st
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// resetPendingRequest zeros out all state related to a HEADERS frame
|
|
// and its zero or more CONTINUATION frames sent to start a new
|
|
// request.
|
|
func (sc *http2serverConn) resetPendingRequest() {
|
|
sc.serveG.check()
|
|
sc.req = http2requestParam{}
|
|
}
|
|
|
|
func (sc *http2serverConn) newWriterAndRequest() (*http2responseWriter, *Request, error) {
|
|
sc.serveG.check()
|
|
rp := &sc.req
|
|
|
|
if rp.invalidHeader {
|
|
return nil, nil, http2StreamError{rp.stream.id, http2ErrCodeProtocol}
|
|
}
|
|
|
|
isConnect := rp.method == "CONNECT"
|
|
if isConnect {
|
|
if rp.path != "" || rp.scheme != "" || rp.authority == "" {
|
|
return nil, nil, http2StreamError{rp.stream.id, http2ErrCodeProtocol}
|
|
}
|
|
} else if rp.method == "" || rp.path == "" ||
|
|
(rp.scheme != "https" && rp.scheme != "http") {
|
|
|
|
return nil, nil, http2StreamError{rp.stream.id, http2ErrCodeProtocol}
|
|
}
|
|
|
|
bodyOpen := rp.stream.state == http2stateOpen
|
|
if rp.method == "HEAD" && bodyOpen {
|
|
|
|
return nil, nil, http2StreamError{rp.stream.id, http2ErrCodeProtocol}
|
|
}
|
|
var tlsState *tls.ConnectionState // nil if not scheme https
|
|
|
|
if rp.scheme == "https" {
|
|
tlsState = sc.tlsState
|
|
}
|
|
authority := rp.authority
|
|
if authority == "" {
|
|
authority = rp.header.Get("Host")
|
|
}
|
|
needsContinue := rp.header.Get("Expect") == "100-continue"
|
|
if needsContinue {
|
|
rp.header.Del("Expect")
|
|
}
|
|
|
|
if cookies := rp.header["Cookie"]; len(cookies) > 1 {
|
|
rp.header.Set("Cookie", strings.Join(cookies, "; "))
|
|
}
|
|
|
|
// Setup Trailers
|
|
var trailer Header
|
|
for _, v := range rp.header["Trailer"] {
|
|
for _, key := range strings.Split(v, ",") {
|
|
key = CanonicalHeaderKey(strings.TrimSpace(key))
|
|
switch key {
|
|
case "Transfer-Encoding", "Trailer", "Content-Length":
|
|
|
|
default:
|
|
if trailer == nil {
|
|
trailer = make(Header)
|
|
}
|
|
trailer[key] = nil
|
|
}
|
|
}
|
|
}
|
|
delete(rp.header, "Trailer")
|
|
|
|
body := &http2requestBody{
|
|
conn: sc,
|
|
stream: rp.stream,
|
|
needsContinue: needsContinue,
|
|
}
|
|
var url_ *url.URL
|
|
var requestURI string
|
|
if isConnect {
|
|
url_ = &url.URL{Host: rp.authority}
|
|
requestURI = rp.authority
|
|
} else {
|
|
var err error
|
|
url_, err = url.ParseRequestURI(rp.path)
|
|
if err != nil {
|
|
return nil, nil, http2StreamError{rp.stream.id, http2ErrCodeProtocol}
|
|
}
|
|
requestURI = rp.path
|
|
}
|
|
req := &Request{
|
|
Method: rp.method,
|
|
URL: url_,
|
|
RemoteAddr: sc.remoteAddrStr,
|
|
Header: rp.header,
|
|
RequestURI: requestURI,
|
|
Proto: "HTTP/2.0",
|
|
ProtoMajor: 2,
|
|
ProtoMinor: 0,
|
|
TLS: tlsState,
|
|
Host: authority,
|
|
Body: body,
|
|
Trailer: trailer,
|
|
}
|
|
if bodyOpen {
|
|
body.pipe = &http2pipe{
|
|
b: &http2fixedBuffer{buf: make([]byte, http2initialWindowSize)},
|
|
}
|
|
|
|
if vv, ok := rp.header["Content-Length"]; ok {
|
|
req.ContentLength, _ = strconv.ParseInt(vv[0], 10, 64)
|
|
} else {
|
|
req.ContentLength = -1
|
|
}
|
|
}
|
|
|
|
rws := http2responseWriterStatePool.Get().(*http2responseWriterState)
|
|
bwSave := rws.bw
|
|
*rws = http2responseWriterState{}
|
|
rws.conn = sc
|
|
rws.bw = bwSave
|
|
rws.bw.Reset(http2chunkWriter{rws})
|
|
rws.stream = rp.stream
|
|
rws.req = req
|
|
rws.body = body
|
|
|
|
rw := &http2responseWriter{rws: rws}
|
|
return rw, req, nil
|
|
}
|
|
|
|
// Run on its own goroutine.
|
|
func (sc *http2serverConn) runHandler(rw *http2responseWriter, req *Request, handler func(ResponseWriter, *Request)) {
|
|
didPanic := true
|
|
defer func() {
|
|
if didPanic {
|
|
e := recover()
|
|
// Same as net/http:
|
|
const size = 64 << 10
|
|
buf := make([]byte, size)
|
|
buf = buf[:runtime.Stack(buf, false)]
|
|
sc.writeFrameFromHandler(http2frameWriteMsg{
|
|
write: http2handlerPanicRST{rw.rws.stream.id},
|
|
stream: rw.rws.stream,
|
|
})
|
|
sc.logf("http2: panic serving %v: %v\n%s", sc.conn.RemoteAddr(), e, buf)
|
|
return
|
|
}
|
|
rw.handlerDone()
|
|
}()
|
|
handler(rw, req)
|
|
didPanic = false
|
|
}
|
|
|
|
func http2handleHeaderListTooLong(w ResponseWriter, r *Request) {
|
|
// 10.5.1 Limits on Header Block Size:
|
|
// .. "A server that receives a larger header block than it is
|
|
// willing to handle can send an HTTP 431 (Request Header Fields Too
|
|
// Large) status code"
|
|
const statusRequestHeaderFieldsTooLarge = 431 // only in Go 1.6+
|
|
w.WriteHeader(statusRequestHeaderFieldsTooLarge)
|
|
io.WriteString(w, "<h1>HTTP Error 431</h1><p>Request Header Field(s) Too Large</p>")
|
|
}
|
|
|
|
// called from handler goroutines.
|
|
// h may be nil.
|
|
func (sc *http2serverConn) writeHeaders(st *http2stream, headerData *http2writeResHeaders) error {
|
|
sc.serveG.checkNotOn()
|
|
var errc chan error
|
|
if headerData.h != nil {
|
|
|
|
errc = http2errChanPool.Get().(chan error)
|
|
}
|
|
if err := sc.writeFrameFromHandler(http2frameWriteMsg{
|
|
write: headerData,
|
|
stream: st,
|
|
done: errc,
|
|
}); err != nil {
|
|
return err
|
|
}
|
|
if errc != nil {
|
|
select {
|
|
case err := <-errc:
|
|
http2errChanPool.Put(errc)
|
|
return err
|
|
case <-sc.doneServing:
|
|
return http2errClientDisconnected
|
|
case <-st.cw:
|
|
return http2errStreamClosed
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// called from handler goroutines.
|
|
func (sc *http2serverConn) write100ContinueHeaders(st *http2stream) {
|
|
sc.writeFrameFromHandler(http2frameWriteMsg{
|
|
write: http2write100ContinueHeadersFrame{st.id},
|
|
stream: st,
|
|
})
|
|
}
|
|
|
|
// A bodyReadMsg tells the server loop that the http.Handler read n
|
|
// bytes of the DATA from the client on the given stream.
|
|
type http2bodyReadMsg struct {
|
|
st *http2stream
|
|
n int
|
|
}
|
|
|
|
// called from handler goroutines.
|
|
// Notes that the handler for the given stream ID read n bytes of its body
|
|
// and schedules flow control tokens to be sent.
|
|
func (sc *http2serverConn) noteBodyReadFromHandler(st *http2stream, n int) {
|
|
sc.serveG.checkNotOn()
|
|
select {
|
|
case sc.bodyReadCh <- http2bodyReadMsg{st, n}:
|
|
case <-sc.doneServing:
|
|
}
|
|
}
|
|
|
|
func (sc *http2serverConn) noteBodyRead(st *http2stream, n int) {
|
|
sc.serveG.check()
|
|
sc.sendWindowUpdate(nil, n)
|
|
if st.state != http2stateHalfClosedRemote && st.state != http2stateClosed {
|
|
|
|
sc.sendWindowUpdate(st, n)
|
|
}
|
|
}
|
|
|
|
// st may be nil for conn-level
|
|
func (sc *http2serverConn) sendWindowUpdate(st *http2stream, n int) {
|
|
sc.serveG.check()
|
|
// "The legal range for the increment to the flow control
|
|
// window is 1 to 2^31-1 (2,147,483,647) octets."
|
|
// A Go Read call on 64-bit machines could in theory read
|
|
// a larger Read than this. Very unlikely, but we handle it here
|
|
// rather than elsewhere for now.
|
|
const maxUint31 = 1<<31 - 1
|
|
for n >= maxUint31 {
|
|
sc.sendWindowUpdate32(st, maxUint31)
|
|
n -= maxUint31
|
|
}
|
|
sc.sendWindowUpdate32(st, int32(n))
|
|
}
|
|
|
|
// st may be nil for conn-level
|
|
func (sc *http2serverConn) sendWindowUpdate32(st *http2stream, n int32) {
|
|
sc.serveG.check()
|
|
if n == 0 {
|
|
return
|
|
}
|
|
if n < 0 {
|
|
panic("negative update")
|
|
}
|
|
var streamID uint32
|
|
if st != nil {
|
|
streamID = st.id
|
|
}
|
|
sc.writeFrame(http2frameWriteMsg{
|
|
write: http2writeWindowUpdate{streamID: streamID, n: uint32(n)},
|
|
stream: st,
|
|
})
|
|
var ok bool
|
|
if st == nil {
|
|
ok = sc.inflow.add(n)
|
|
} else {
|
|
ok = st.inflow.add(n)
|
|
}
|
|
if !ok {
|
|
panic("internal error; sent too many window updates without decrements?")
|
|
}
|
|
}
|
|
|
|
type http2requestBody struct {
|
|
stream *http2stream
|
|
conn *http2serverConn
|
|
closed bool
|
|
pipe *http2pipe // non-nil if we have a HTTP entity message body
|
|
needsContinue bool // need to send a 100-continue
|
|
}
|
|
|
|
func (b *http2requestBody) Close() error {
|
|
if b.pipe != nil {
|
|
b.pipe.CloseWithError(http2errClosedBody)
|
|
}
|
|
b.closed = true
|
|
return nil
|
|
}
|
|
|
|
func (b *http2requestBody) Read(p []byte) (n int, err error) {
|
|
if b.needsContinue {
|
|
b.needsContinue = false
|
|
b.conn.write100ContinueHeaders(b.stream)
|
|
}
|
|
if b.pipe == nil {
|
|
return 0, io.EOF
|
|
}
|
|
n, err = b.pipe.Read(p)
|
|
if n > 0 {
|
|
b.conn.noteBodyReadFromHandler(b.stream, n)
|
|
}
|
|
return
|
|
}
|
|
|
|
// responseWriter is the http.ResponseWriter implementation. It's
|
|
// intentionally small (1 pointer wide) to minimize garbage. The
|
|
// responseWriterState pointer inside is zeroed at the end of a
|
|
// request (in handlerDone) and calls on the responseWriter thereafter
|
|
// simply crash (caller's mistake), but the much larger responseWriterState
|
|
// and buffers are reused between multiple requests.
|
|
type http2responseWriter struct {
|
|
rws *http2responseWriterState
|
|
}
|
|
|
|
// Optional http.ResponseWriter interfaces implemented.
|
|
var (
|
|
_ CloseNotifier = (*http2responseWriter)(nil)
|
|
_ Flusher = (*http2responseWriter)(nil)
|
|
_ http2stringWriter = (*http2responseWriter)(nil)
|
|
)
|
|
|
|
type http2responseWriterState struct {
|
|
// immutable within a request:
|
|
stream *http2stream
|
|
req *Request
|
|
body *http2requestBody // to close at end of request, if DATA frames didn't
|
|
conn *http2serverConn
|
|
|
|
// TODO: adjust buffer writing sizes based on server config, frame size updates from peer, etc
|
|
bw *bufio.Writer // writing to a chunkWriter{this *responseWriterState}
|
|
|
|
// mutated by http.Handler goroutine:
|
|
handlerHeader Header // nil until called
|
|
snapHeader Header // snapshot of handlerHeader at WriteHeader time
|
|
trailers []string // set in writeChunk
|
|
status int // status code passed to WriteHeader
|
|
wroteHeader bool // WriteHeader called (explicitly or implicitly). Not necessarily sent to user yet.
|
|
sentHeader bool // have we sent the header frame?
|
|
handlerDone bool // handler has finished
|
|
|
|
sentContentLen int64 // non-zero if handler set a Content-Length header
|
|
wroteBytes int64
|
|
|
|
closeNotifierMu sync.Mutex // guards closeNotifierCh
|
|
closeNotifierCh chan bool // nil until first used
|
|
}
|
|
|
|
type http2chunkWriter struct{ rws *http2responseWriterState }
|
|
|
|
func (cw http2chunkWriter) Write(p []byte) (n int, err error) { return cw.rws.writeChunk(p) }
|
|
|
|
func (rws *http2responseWriterState) hasTrailers() bool { return len(rws.trailers) != 0 }
|
|
|
|
// declareTrailer is called for each Trailer header when the
|
|
// response header is written. It notes that a header will need to be
|
|
// written in the trailers at the end of the response.
|
|
func (rws *http2responseWriterState) declareTrailer(k string) {
|
|
k = CanonicalHeaderKey(k)
|
|
switch k {
|
|
case "Transfer-Encoding", "Content-Length", "Trailer":
|
|
|
|
return
|
|
}
|
|
if !http2strSliceContains(rws.trailers, k) {
|
|
rws.trailers = append(rws.trailers, k)
|
|
}
|
|
}
|
|
|
|
// writeChunk writes chunks from the bufio.Writer. But because
|
|
// bufio.Writer may bypass its chunking, sometimes p may be
|
|
// arbitrarily large.
|
|
//
|
|
// writeChunk is also responsible (on the first chunk) for sending the
|
|
// HEADER response.
|
|
func (rws *http2responseWriterState) writeChunk(p []byte) (n int, err error) {
|
|
if !rws.wroteHeader {
|
|
rws.writeHeader(200)
|
|
}
|
|
|
|
isHeadResp := rws.req.Method == "HEAD"
|
|
if !rws.sentHeader {
|
|
rws.sentHeader = true
|
|
var ctype, clen string
|
|
if clen = rws.snapHeader.Get("Content-Length"); clen != "" {
|
|
rws.snapHeader.Del("Content-Length")
|
|
clen64, err := strconv.ParseInt(clen, 10, 64)
|
|
if err == nil && clen64 >= 0 {
|
|
rws.sentContentLen = clen64
|
|
} else {
|
|
clen = ""
|
|
}
|
|
}
|
|
if clen == "" && rws.handlerDone && http2bodyAllowedForStatus(rws.status) && (len(p) > 0 || !isHeadResp) {
|
|
clen = strconv.Itoa(len(p))
|
|
}
|
|
_, hasContentType := rws.snapHeader["Content-Type"]
|
|
if !hasContentType && http2bodyAllowedForStatus(rws.status) {
|
|
ctype = DetectContentType(p)
|
|
}
|
|
var date string
|
|
if _, ok := rws.snapHeader["Date"]; !ok {
|
|
|
|
date = time.Now().UTC().Format(TimeFormat)
|
|
}
|
|
|
|
for _, v := range rws.snapHeader["Trailer"] {
|
|
http2foreachHeaderElement(v, rws.declareTrailer)
|
|
}
|
|
|
|
endStream := (rws.handlerDone && !rws.hasTrailers() && len(p) == 0) || isHeadResp
|
|
err = rws.conn.writeHeaders(rws.stream, &http2writeResHeaders{
|
|
streamID: rws.stream.id,
|
|
httpResCode: rws.status,
|
|
h: rws.snapHeader,
|
|
endStream: endStream,
|
|
contentType: ctype,
|
|
contentLength: clen,
|
|
date: date,
|
|
})
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
if endStream {
|
|
return 0, nil
|
|
}
|
|
}
|
|
if isHeadResp {
|
|
return len(p), nil
|
|
}
|
|
if len(p) == 0 && !rws.handlerDone {
|
|
return 0, nil
|
|
}
|
|
|
|
if rws.handlerDone {
|
|
rws.promoteUndeclaredTrailers()
|
|
}
|
|
|
|
endStream := rws.handlerDone && !rws.hasTrailers()
|
|
if len(p) > 0 || endStream {
|
|
|
|
if err := rws.conn.writeDataFromHandler(rws.stream, p, endStream); err != nil {
|
|
return 0, err
|
|
}
|
|
}
|
|
|
|
if rws.handlerDone && rws.hasTrailers() {
|
|
err = rws.conn.writeHeaders(rws.stream, &http2writeResHeaders{
|
|
streamID: rws.stream.id,
|
|
h: rws.handlerHeader,
|
|
trailers: rws.trailers,
|
|
endStream: true,
|
|
})
|
|
return len(p), err
|
|
}
|
|
return len(p), nil
|
|
}
|
|
|
|
// TrailerPrefix is a magic prefix for ResponseWriter.Header map keys
|
|
// that, if present, signals that the map entry is actually for
|
|
// the response trailers, and not the response headers. The prefix
|
|
// is stripped after the ServeHTTP call finishes and the values are
|
|
// sent in the trailers.
|
|
//
|
|
// This mechanism is intended only for trailers that are not known
|
|
// prior to the headers being written. If the set of trailers is fixed
|
|
// or known before the header is written, the normal Go trailers mechanism
|
|
// is preferred:
|
|
// https://golang.org/pkg/net/http/#ResponseWriter
|
|
// https://golang.org/pkg/net/http/#example_ResponseWriter_trailers
|
|
const http2TrailerPrefix = "Trailer:"
|
|
|
|
// promoteUndeclaredTrailers permits http.Handlers to set trailers
|
|
// after the header has already been flushed. Because the Go
|
|
// ResponseWriter interface has no way to set Trailers (only the
|
|
// Header), and because we didn't want to expand the ResponseWriter
|
|
// interface, and because nobody used trailers, and because RFC 2616
|
|
// says you SHOULD (but not must) predeclare any trailers in the
|
|
// header, the official ResponseWriter rules said trailers in Go must
|
|
// be predeclared, and then we reuse the same ResponseWriter.Header()
|
|
// map to mean both Headers and Trailers. When it's time to write the
|
|
// Trailers, we pick out the fields of Headers that were declared as
|
|
// trailers. That worked for a while, until we found the first major
|
|
// user of Trailers in the wild: gRPC (using them only over http2),
|
|
// and gRPC libraries permit setting trailers mid-stream without
|
|
// predeclarnig them. So: change of plans. We still permit the old
|
|
// way, but we also permit this hack: if a Header() key begins with
|
|
// "Trailer:", the suffix of that key is a Trailer. Because ':' is an
|
|
// invalid token byte anyway, there is no ambiguity. (And it's already
|
|
// filtered out) It's mildly hacky, but not terrible.
|
|
//
|
|
// This method runs after the Handler is done and promotes any Header
|
|
// fields to be trailers.
|
|
func (rws *http2responseWriterState) promoteUndeclaredTrailers() {
|
|
for k, vv := range rws.handlerHeader {
|
|
if !strings.HasPrefix(k, http2TrailerPrefix) {
|
|
continue
|
|
}
|
|
trailerKey := strings.TrimPrefix(k, http2TrailerPrefix)
|
|
rws.declareTrailer(trailerKey)
|
|
rws.handlerHeader[CanonicalHeaderKey(trailerKey)] = vv
|
|
}
|
|
sort.Strings(rws.trailers)
|
|
}
|
|
|
|
func (w *http2responseWriter) Flush() {
|
|
rws := w.rws
|
|
if rws == nil {
|
|
panic("Header called after Handler finished")
|
|
}
|
|
if rws.bw.Buffered() > 0 {
|
|
if err := rws.bw.Flush(); err != nil {
|
|
|
|
return
|
|
}
|
|
} else {
|
|
|
|
rws.writeChunk(nil)
|
|
}
|
|
}
|
|
|
|
func (w *http2responseWriter) CloseNotify() <-chan bool {
|
|
rws := w.rws
|
|
if rws == nil {
|
|
panic("CloseNotify called after Handler finished")
|
|
}
|
|
rws.closeNotifierMu.Lock()
|
|
ch := rws.closeNotifierCh
|
|
if ch == nil {
|
|
ch = make(chan bool, 1)
|
|
rws.closeNotifierCh = ch
|
|
go func() {
|
|
rws.stream.cw.Wait()
|
|
ch <- true
|
|
}()
|
|
}
|
|
rws.closeNotifierMu.Unlock()
|
|
return ch
|
|
}
|
|
|
|
func (w *http2responseWriter) Header() Header {
|
|
rws := w.rws
|
|
if rws == nil {
|
|
panic("Header called after Handler finished")
|
|
}
|
|
if rws.handlerHeader == nil {
|
|
rws.handlerHeader = make(Header)
|
|
}
|
|
return rws.handlerHeader
|
|
}
|
|
|
|
func (w *http2responseWriter) WriteHeader(code int) {
|
|
rws := w.rws
|
|
if rws == nil {
|
|
panic("WriteHeader called after Handler finished")
|
|
}
|
|
rws.writeHeader(code)
|
|
}
|
|
|
|
func (rws *http2responseWriterState) writeHeader(code int) {
|
|
if !rws.wroteHeader {
|
|
rws.wroteHeader = true
|
|
rws.status = code
|
|
if len(rws.handlerHeader) > 0 {
|
|
rws.snapHeader = http2cloneHeader(rws.handlerHeader)
|
|
}
|
|
}
|
|
}
|
|
|
|
func http2cloneHeader(h Header) Header {
|
|
h2 := make(Header, len(h))
|
|
for k, vv := range h {
|
|
vv2 := make([]string, len(vv))
|
|
copy(vv2, vv)
|
|
h2[k] = vv2
|
|
}
|
|
return h2
|
|
}
|
|
|
|
// The Life Of A Write is like this:
|
|
//
|
|
// * Handler calls w.Write or w.WriteString ->
|
|
// * -> rws.bw (*bufio.Writer) ->
|
|
// * (Handler migth call Flush)
|
|
// * -> chunkWriter{rws}
|
|
// * -> responseWriterState.writeChunk(p []byte)
|
|
// * -> responseWriterState.writeChunk (most of the magic; see comment there)
|
|
func (w *http2responseWriter) Write(p []byte) (n int, err error) {
|
|
return w.write(len(p), p, "")
|
|
}
|
|
|
|
func (w *http2responseWriter) WriteString(s string) (n int, err error) {
|
|
return w.write(len(s), nil, s)
|
|
}
|
|
|
|
// either dataB or dataS is non-zero.
|
|
func (w *http2responseWriter) write(lenData int, dataB []byte, dataS string) (n int, err error) {
|
|
rws := w.rws
|
|
if rws == nil {
|
|
panic("Write called after Handler finished")
|
|
}
|
|
if !rws.wroteHeader {
|
|
w.WriteHeader(200)
|
|
}
|
|
if !http2bodyAllowedForStatus(rws.status) {
|
|
return 0, ErrBodyNotAllowed
|
|
}
|
|
rws.wroteBytes += int64(len(dataB)) + int64(len(dataS))
|
|
if rws.sentContentLen != 0 && rws.wroteBytes > rws.sentContentLen {
|
|
|
|
return 0, errors.New("http2: handler wrote more than declared Content-Length")
|
|
}
|
|
|
|
if dataB != nil {
|
|
return rws.bw.Write(dataB)
|
|
} else {
|
|
return rws.bw.WriteString(dataS)
|
|
}
|
|
}
|
|
|
|
func (w *http2responseWriter) handlerDone() {
|
|
rws := w.rws
|
|
rws.handlerDone = true
|
|
w.Flush()
|
|
w.rws = nil
|
|
http2responseWriterStatePool.Put(rws)
|
|
}
|
|
|
|
// foreachHeaderElement splits v according to the "#rule" construction
|
|
// in RFC 2616 section 2.1 and calls fn for each non-empty element.
|
|
func http2foreachHeaderElement(v string, fn func(string)) {
|
|
v = textproto.TrimString(v)
|
|
if v == "" {
|
|
return
|
|
}
|
|
if !strings.Contains(v, ",") {
|
|
fn(v)
|
|
return
|
|
}
|
|
for _, f := range strings.Split(v, ",") {
|
|
if f = textproto.TrimString(f); f != "" {
|
|
fn(f)
|
|
}
|
|
}
|
|
}
|
|
|
|
const (
|
|
// transportDefaultConnFlow is how many connection-level flow control
|
|
// tokens we give the server at start-up, past the default 64k.
|
|
http2transportDefaultConnFlow = 1 << 30
|
|
|
|
// transportDefaultStreamFlow is how many stream-level flow
|
|
// control tokens we announce to the peer, and how many bytes
|
|
// we buffer per stream.
|
|
http2transportDefaultStreamFlow = 4 << 20
|
|
|
|
// transportDefaultStreamMinRefresh is the minimum number of bytes we'll send
|
|
// a stream-level WINDOW_UPDATE for at a time.
|
|
http2transportDefaultStreamMinRefresh = 4 << 10
|
|
|
|
http2defaultUserAgent = "Go-http-client/2.0"
|
|
)
|
|
|
|
// Transport is an HTTP/2 Transport.
|
|
//
|
|
// A Transport internally caches connections to servers. It is safe
|
|
// for concurrent use by multiple goroutines.
|
|
type http2Transport struct {
|
|
// DialTLS specifies an optional dial function for creating
|
|
// TLS connections for requests.
|
|
//
|
|
// If DialTLS is nil, tls.Dial is used.
|
|
//
|
|
// If the returned net.Conn has a ConnectionState method like tls.Conn,
|
|
// it will be used to set http.Response.TLS.
|
|
DialTLS func(network, addr string, cfg *tls.Config) (net.Conn, error)
|
|
|
|
// TLSClientConfig specifies the TLS configuration to use with
|
|
// tls.Client. If nil, the default configuration is used.
|
|
TLSClientConfig *tls.Config
|
|
|
|
// ConnPool optionally specifies an alternate connection pool to use.
|
|
// If nil, the default is used.
|
|
ConnPool http2ClientConnPool
|
|
|
|
// DisableCompression, if true, prevents the Transport from
|
|
// requesting compression with an "Accept-Encoding: gzip"
|
|
// request header when the Request contains no existing
|
|
// Accept-Encoding value. If the Transport requests gzip on
|
|
// its own and gets a gzipped response, it's transparently
|
|
// decoded in the Response.Body. However, if the user
|
|
// explicitly requested gzip it is not automatically
|
|
// uncompressed.
|
|
DisableCompression bool
|
|
|
|
// MaxHeaderListSize is the http2 SETTINGS_MAX_HEADER_LIST_SIZE to
|
|
// send in the initial settings frame. It is how many bytes
|
|
// of response headers are allow. Unlike the http2 spec, zero here
|
|
// means to use a default limit (currently 10MB). If you actually
|
|
// want to advertise an ulimited value to the peer, Transport
|
|
// interprets the highest possible value here (0xffffffff or 1<<32-1)
|
|
// to mean no limit.
|
|
MaxHeaderListSize uint32
|
|
|
|
// t1, if non-nil, is the standard library Transport using
|
|
// this transport. Its settings are used (but not its
|
|
// RoundTrip method, etc).
|
|
t1 *Transport
|
|
|
|
connPoolOnce sync.Once
|
|
connPoolOrDef http2ClientConnPool // non-nil version of ConnPool
|
|
}
|
|
|
|
func (t *http2Transport) maxHeaderListSize() uint32 {
|
|
if t.MaxHeaderListSize == 0 {
|
|
return 10 << 20
|
|
}
|
|
if t.MaxHeaderListSize == 0xffffffff {
|
|
return 0
|
|
}
|
|
return t.MaxHeaderListSize
|
|
}
|
|
|
|
func (t *http2Transport) disableCompression() bool {
|
|
return t.DisableCompression || (t.t1 != nil && t.t1.DisableCompression)
|
|
}
|
|
|
|
var http2errTransportVersion = errors.New("http2: ConfigureTransport is only supported starting at Go 1.6")
|
|
|
|
// ConfigureTransport configures a net/http HTTP/1 Transport to use HTTP/2.
|
|
// It requires Go 1.6 or later and returns an error if the net/http package is too old
|
|
// or if t1 has already been HTTP/2-enabled.
|
|
func http2ConfigureTransport(t1 *Transport) error {
|
|
_, err := http2configureTransport(t1)
|
|
return err
|
|
}
|
|
|
|
func (t *http2Transport) connPool() http2ClientConnPool {
|
|
t.connPoolOnce.Do(t.initConnPool)
|
|
return t.connPoolOrDef
|
|
}
|
|
|
|
func (t *http2Transport) initConnPool() {
|
|
if t.ConnPool != nil {
|
|
t.connPoolOrDef = t.ConnPool
|
|
} else {
|
|
t.connPoolOrDef = &http2clientConnPool{t: t}
|
|
}
|
|
}
|
|
|
|
// ClientConn is the state of a single HTTP/2 client connection to an
|
|
// HTTP/2 server.
|
|
type http2ClientConn struct {
|
|
t *http2Transport
|
|
tconn net.Conn // usually *tls.Conn, except specialized impls
|
|
tlsState *tls.ConnectionState // nil only for specialized impls
|
|
|
|
// readLoop goroutine fields:
|
|
readerDone chan struct{} // closed on error
|
|
readerErr error // set before readerDone is closed
|
|
|
|
mu sync.Mutex // guards following
|
|
cond *sync.Cond // hold mu; broadcast on flow/closed changes
|
|
flow http2flow // our conn-level flow control quota (cs.flow is per stream)
|
|
inflow http2flow // peer's conn-level flow control
|
|
closed bool
|
|
goAway *http2GoAwayFrame // if non-nil, the GoAwayFrame we received
|
|
streams map[uint32]*http2clientStream // client-initiated
|
|
nextStreamID uint32
|
|
bw *bufio.Writer
|
|
br *bufio.Reader
|
|
fr *http2Framer
|
|
// Settings from peer:
|
|
maxFrameSize uint32
|
|
maxConcurrentStreams uint32
|
|
initialWindowSize uint32
|
|
hbuf bytes.Buffer // HPACK encoder writes into this
|
|
henc *hpack.Encoder
|
|
freeBuf [][]byte
|
|
|
|
wmu sync.Mutex // held while writing; acquire AFTER mu if holding both
|
|
werr error // first write error that has occurred
|
|
}
|
|
|
|
// clientStream is the state for a single HTTP/2 stream. One of these
|
|
// is created for each Transport.RoundTrip call.
|
|
type http2clientStream struct {
|
|
cc *http2ClientConn
|
|
req *Request
|
|
ID uint32
|
|
resc chan http2resAndError
|
|
bufPipe http2pipe // buffered pipe with the flow-controlled response payload
|
|
requestedGzip bool
|
|
|
|
flow http2flow // guarded by cc.mu
|
|
inflow http2flow // guarded by cc.mu
|
|
bytesRemain int64 // -1 means unknown; owned by transportResponseBody.Read
|
|
readErr error // sticky read error; owned by transportResponseBody.Read
|
|
stopReqBody error // if non-nil, stop writing req body; guarded by cc.mu
|
|
|
|
peerReset chan struct{} // closed on peer reset
|
|
resetErr error // populated before peerReset is closed
|
|
|
|
done chan struct{} // closed when stream remove from cc.streams map; close calls guarded by cc.mu
|
|
|
|
// owned by clientConnReadLoop:
|
|
pastHeaders bool // got HEADERS w/ END_HEADERS
|
|
pastTrailers bool // got second HEADERS frame w/ END_HEADERS
|
|
|
|
trailer Header // accumulated trailers
|
|
resTrailer *Header // client's Response.Trailer
|
|
}
|
|
|
|
// awaitRequestCancel runs in its own goroutine and waits for the user
|
|
// to either cancel a RoundTrip request (using the provided
|
|
// Request.Cancel channel), or for the request to be done (any way it
|
|
// might be removed from the cc.streams map: peer reset, successful
|
|
// completion, TCP connection breakage, etc)
|
|
func (cs *http2clientStream) awaitRequestCancel(cancel <-chan struct{}) {
|
|
if cancel == nil {
|
|
return
|
|
}
|
|
select {
|
|
case <-cancel:
|
|
cs.bufPipe.CloseWithError(http2errRequestCanceled)
|
|
cs.cc.writeStreamReset(cs.ID, http2ErrCodeCancel, nil)
|
|
case <-cs.done:
|
|
}
|
|
}
|
|
|
|
// checkReset reports any error sent in a RST_STREAM frame by the
|
|
// server.
|
|
func (cs *http2clientStream) checkReset() error {
|
|
select {
|
|
case <-cs.peerReset:
|
|
return cs.resetErr
|
|
default:
|
|
return nil
|
|
}
|
|
}
|
|
|
|
func (cs *http2clientStream) abortRequestBodyWrite(err error) {
|
|
if err == nil {
|
|
panic("nil error")
|
|
}
|
|
cc := cs.cc
|
|
cc.mu.Lock()
|
|
cs.stopReqBody = err
|
|
cc.cond.Broadcast()
|
|
cc.mu.Unlock()
|
|
}
|
|
|
|
type http2stickyErrWriter struct {
|
|
w io.Writer
|
|
err *error
|
|
}
|
|
|
|
func (sew http2stickyErrWriter) Write(p []byte) (n int, err error) {
|
|
if *sew.err != nil {
|
|
return 0, *sew.err
|
|
}
|
|
n, err = sew.w.Write(p)
|
|
*sew.err = err
|
|
return
|
|
}
|
|
|
|
var http2ErrNoCachedConn = errors.New("http2: no cached connection was available")
|
|
|
|
// RoundTripOpt are options for the Transport.RoundTripOpt method.
|
|
type http2RoundTripOpt struct {
|
|
// OnlyCachedConn controls whether RoundTripOpt may
|
|
// create a new TCP connection. If set true and
|
|
// no cached connection is available, RoundTripOpt
|
|
// will return ErrNoCachedConn.
|
|
OnlyCachedConn bool
|
|
}
|
|
|
|
func (t *http2Transport) RoundTrip(req *Request) (*Response, error) {
|
|
return t.RoundTripOpt(req, http2RoundTripOpt{})
|
|
}
|
|
|
|
// authorityAddr returns a given authority (a host/IP, or host:port / ip:port)
|
|
// and returns a host:port. The port 443 is added if needed.
|
|
func http2authorityAddr(authority string) (addr string) {
|
|
if _, _, err := net.SplitHostPort(authority); err == nil {
|
|
return authority
|
|
}
|
|
return net.JoinHostPort(authority, "443")
|
|
}
|
|
|
|
// RoundTripOpt is like RoundTrip, but takes options.
|
|
func (t *http2Transport) RoundTripOpt(req *Request, opt http2RoundTripOpt) (*Response, error) {
|
|
if req.URL.Scheme != "https" {
|
|
return nil, errors.New("http2: unsupported scheme")
|
|
}
|
|
|
|
addr := http2authorityAddr(req.URL.Host)
|
|
for {
|
|
cc, err := t.connPool().GetClientConn(req, addr)
|
|
if err != nil {
|
|
t.vlogf("http2: Transport failed to get client conn for %s: %v", addr, err)
|
|
return nil, err
|
|
}
|
|
res, err := cc.RoundTrip(req)
|
|
if http2shouldRetryRequest(req, err) {
|
|
continue
|
|
}
|
|
if err != nil {
|
|
t.vlogf("RoundTrip failure: %v", err)
|
|
return nil, err
|
|
}
|
|
return res, nil
|
|
}
|
|
}
|
|
|
|
// CloseIdleConnections closes any connections which were previously
|
|
// connected from previous requests but are now sitting idle.
|
|
// It does not interrupt any connections currently in use.
|
|
func (t *http2Transport) CloseIdleConnections() {
|
|
if cp, ok := t.connPool().(*http2clientConnPool); ok {
|
|
cp.closeIdleConnections()
|
|
}
|
|
}
|
|
|
|
var (
|
|
http2errClientConnClosed = errors.New("http2: client conn is closed")
|
|
http2errClientConnUnusable = errors.New("http2: client conn not usable")
|
|
)
|
|
|
|
func http2shouldRetryRequest(req *Request, err error) bool {
|
|
|
|
return err == http2errClientConnUnusable
|
|
}
|
|
|
|
func (t *http2Transport) dialClientConn(addr string) (*http2ClientConn, error) {
|
|
host, _, err := net.SplitHostPort(addr)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
tconn, err := t.dialTLS()("tcp", addr, t.newTLSConfig(host))
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return t.NewClientConn(tconn)
|
|
}
|
|
|
|
func (t *http2Transport) newTLSConfig(host string) *tls.Config {
|
|
cfg := new(tls.Config)
|
|
if t.TLSClientConfig != nil {
|
|
*cfg = *t.TLSClientConfig
|
|
}
|
|
cfg.NextProtos = []string{http2NextProtoTLS}
|
|
cfg.ServerName = host
|
|
return cfg
|
|
}
|
|
|
|
func (t *http2Transport) dialTLS() func(string, string, *tls.Config) (net.Conn, error) {
|
|
if t.DialTLS != nil {
|
|
return t.DialTLS
|
|
}
|
|
return t.dialTLSDefault
|
|
}
|
|
|
|
func (t *http2Transport) dialTLSDefault(network, addr string, cfg *tls.Config) (net.Conn, error) {
|
|
cn, err := tls.Dial(network, addr, cfg)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
if err := cn.Handshake(); err != nil {
|
|
return nil, err
|
|
}
|
|
if !cfg.InsecureSkipVerify {
|
|
if err := cn.VerifyHostname(cfg.ServerName); err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
state := cn.ConnectionState()
|
|
if p := state.NegotiatedProtocol; p != http2NextProtoTLS {
|
|
return nil, fmt.Errorf("http2: unexpected ALPN protocol %q; want %q", p, http2NextProtoTLS)
|
|
}
|
|
if !state.NegotiatedProtocolIsMutual {
|
|
return nil, errors.New("http2: could not negotiate protocol mutually")
|
|
}
|
|
return cn, nil
|
|
}
|
|
|
|
// disableKeepAlives reports whether connections should be closed as
|
|
// soon as possible after handling the first request.
|
|
func (t *http2Transport) disableKeepAlives() bool {
|
|
return t.t1 != nil && t.t1.DisableKeepAlives
|
|
}
|
|
|
|
func (t *http2Transport) NewClientConn(c net.Conn) (*http2ClientConn, error) {
|
|
if http2VerboseLogs {
|
|
t.vlogf("http2: Transport creating client conn to %v", c.RemoteAddr())
|
|
}
|
|
if _, err := c.Write(http2clientPreface); err != nil {
|
|
t.vlogf("client preface write error: %v", err)
|
|
return nil, err
|
|
}
|
|
|
|
cc := &http2ClientConn{
|
|
t: t,
|
|
tconn: c,
|
|
readerDone: make(chan struct{}),
|
|
nextStreamID: 1,
|
|
maxFrameSize: 16 << 10,
|
|
initialWindowSize: 65535,
|
|
maxConcurrentStreams: 1000,
|
|
streams: make(map[uint32]*http2clientStream),
|
|
}
|
|
cc.cond = sync.NewCond(&cc.mu)
|
|
cc.flow.add(int32(http2initialWindowSize))
|
|
|
|
cc.bw = bufio.NewWriter(http2stickyErrWriter{c, &cc.werr})
|
|
cc.br = bufio.NewReader(c)
|
|
cc.fr = http2NewFramer(cc.bw, cc.br)
|
|
|
|
cc.henc = hpack.NewEncoder(&cc.hbuf)
|
|
|
|
if cs, ok := c.(http2connectionStater); ok {
|
|
state := cs.ConnectionState()
|
|
cc.tlsState = &state
|
|
}
|
|
|
|
initialSettings := []http2Setting{
|
|
http2Setting{ID: http2SettingEnablePush, Val: 0},
|
|
http2Setting{ID: http2SettingInitialWindowSize, Val: http2transportDefaultStreamFlow},
|
|
}
|
|
if max := t.maxHeaderListSize(); max != 0 {
|
|
initialSettings = append(initialSettings, http2Setting{ID: http2SettingMaxHeaderListSize, Val: max})
|
|
}
|
|
cc.fr.WriteSettings(initialSettings...)
|
|
cc.fr.WriteWindowUpdate(0, http2transportDefaultConnFlow)
|
|
cc.inflow.add(http2transportDefaultConnFlow + http2initialWindowSize)
|
|
cc.bw.Flush()
|
|
if cc.werr != nil {
|
|
return nil, cc.werr
|
|
}
|
|
|
|
f, err := cc.fr.ReadFrame()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
sf, ok := f.(*http2SettingsFrame)
|
|
if !ok {
|
|
return nil, fmt.Errorf("expected settings frame, got: %T", f)
|
|
}
|
|
cc.fr.WriteSettingsAck()
|
|
cc.bw.Flush()
|
|
|
|
sf.ForeachSetting(func(s http2Setting) error {
|
|
switch s.ID {
|
|
case http2SettingMaxFrameSize:
|
|
cc.maxFrameSize = s.Val
|
|
case http2SettingMaxConcurrentStreams:
|
|
cc.maxConcurrentStreams = s.Val
|
|
case http2SettingInitialWindowSize:
|
|
cc.initialWindowSize = s.Val
|
|
default:
|
|
|
|
t.vlogf("Unhandled Setting: %v", s)
|
|
}
|
|
return nil
|
|
})
|
|
|
|
go cc.readLoop()
|
|
return cc, nil
|
|
}
|
|
|
|
func (cc *http2ClientConn) setGoAway(f *http2GoAwayFrame) {
|
|
cc.mu.Lock()
|
|
defer cc.mu.Unlock()
|
|
cc.goAway = f
|
|
}
|
|
|
|
func (cc *http2ClientConn) CanTakeNewRequest() bool {
|
|
cc.mu.Lock()
|
|
defer cc.mu.Unlock()
|
|
return cc.canTakeNewRequestLocked()
|
|
}
|
|
|
|
func (cc *http2ClientConn) canTakeNewRequestLocked() bool {
|
|
return cc.goAway == nil && !cc.closed &&
|
|
int64(len(cc.streams)+1) < int64(cc.maxConcurrentStreams) &&
|
|
cc.nextStreamID < 2147483647
|
|
}
|
|
|
|
func (cc *http2ClientConn) closeIfIdle() {
|
|
cc.mu.Lock()
|
|
if len(cc.streams) > 0 {
|
|
cc.mu.Unlock()
|
|
return
|
|
}
|
|
cc.closed = true
|
|
|
|
cc.mu.Unlock()
|
|
|
|
cc.tconn.Close()
|
|
}
|
|
|
|
const http2maxAllocFrameSize = 512 << 10
|
|
|
|
// frameBuffer returns a scratch buffer suitable for writing DATA frames.
|
|
// They're capped at the min of the peer's max frame size or 512KB
|
|
// (kinda arbitrarily), but definitely capped so we don't allocate 4GB
|
|
// bufers.
|
|
func (cc *http2ClientConn) frameScratchBuffer() []byte {
|
|
cc.mu.Lock()
|
|
size := cc.maxFrameSize
|
|
if size > http2maxAllocFrameSize {
|
|
size = http2maxAllocFrameSize
|
|
}
|
|
for i, buf := range cc.freeBuf {
|
|
if len(buf) >= int(size) {
|
|
cc.freeBuf[i] = nil
|
|
cc.mu.Unlock()
|
|
return buf[:size]
|
|
}
|
|
}
|
|
cc.mu.Unlock()
|
|
return make([]byte, size)
|
|
}
|
|
|
|
func (cc *http2ClientConn) putFrameScratchBuffer(buf []byte) {
|
|
cc.mu.Lock()
|
|
defer cc.mu.Unlock()
|
|
const maxBufs = 4 // arbitrary; 4 concurrent requests per conn? investigate.
|
|
if len(cc.freeBuf) < maxBufs {
|
|
cc.freeBuf = append(cc.freeBuf, buf)
|
|
return
|
|
}
|
|
for i, old := range cc.freeBuf {
|
|
if old == nil {
|
|
cc.freeBuf[i] = buf
|
|
return
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
// errRequestCanceled is a copy of net/http's errRequestCanceled because it's not
|
|
// exported. At least they'll be DeepEqual for h1-vs-h2 comparisons tests.
|
|
var http2errRequestCanceled = errors.New("net/http: request canceled")
|
|
|
|
func http2commaSeparatedTrailers(req *Request) (string, error) {
|
|
keys := make([]string, 0, len(req.Trailer))
|
|
for k := range req.Trailer {
|
|
k = CanonicalHeaderKey(k)
|
|
switch k {
|
|
case "Transfer-Encoding", "Trailer", "Content-Length":
|
|
return "", &http2badStringError{"invalid Trailer key", k}
|
|
}
|
|
keys = append(keys, k)
|
|
}
|
|
if len(keys) > 0 {
|
|
sort.Strings(keys)
|
|
|
|
return strings.Join(keys, ","), nil
|
|
}
|
|
return "", nil
|
|
}
|
|
|
|
func (cc *http2ClientConn) responseHeaderTimeout() time.Duration {
|
|
if cc.t.t1 != nil {
|
|
return cc.t.t1.ResponseHeaderTimeout
|
|
}
|
|
|
|
return 0
|
|
}
|
|
|
|
// checkConnHeaders checks whether req has any invalid connection-level headers.
|
|
// per RFC 7540 section 8.1.2.2: Connection-Specific Header Fields.
|
|
// Certain headers are special-cased as okay but not transmitted later.
|
|
func http2checkConnHeaders(req *Request) error {
|
|
if v := req.Header.Get("Upgrade"); v != "" {
|
|
return errors.New("http2: invalid Upgrade request header")
|
|
}
|
|
if v := req.Header.Get("Transfer-Encoding"); (v != "" && v != "chunked") || len(req.Header["Transfer-Encoding"]) > 1 {
|
|
return errors.New("http2: invalid Transfer-Encoding request header")
|
|
}
|
|
if v := req.Header.Get("Connection"); (v != "" && v != "close" && v != "keep-alive") || len(req.Header["Connection"]) > 1 {
|
|
return errors.New("http2: invalid Connection request header")
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (cc *http2ClientConn) RoundTrip(req *Request) (*Response, error) {
|
|
if err := http2checkConnHeaders(req); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
trailers, err := http2commaSeparatedTrailers(req)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
hasTrailers := trailers != ""
|
|
|
|
var body io.Reader = req.Body
|
|
contentLen := req.ContentLength
|
|
if req.Body != nil && contentLen == 0 {
|
|
// Test to see if it's actually zero or just unset.
|
|
var buf [1]byte
|
|
n, rerr := io.ReadFull(body, buf[:])
|
|
if rerr != nil && rerr != io.EOF {
|
|
contentLen = -1
|
|
body = http2errorReader{rerr}
|
|
} else if n == 1 {
|
|
|
|
contentLen = -1
|
|
body = io.MultiReader(bytes.NewReader(buf[:]), body)
|
|
} else {
|
|
|
|
body = nil
|
|
}
|
|
}
|
|
|
|
cc.mu.Lock()
|
|
if cc.closed || !cc.canTakeNewRequestLocked() {
|
|
cc.mu.Unlock()
|
|
return nil, http2errClientConnUnusable
|
|
}
|
|
|
|
cs := cc.newStream()
|
|
cs.req = req
|
|
hasBody := body != nil
|
|
|
|
if !cc.t.disableCompression() &&
|
|
req.Header.Get("Accept-Encoding") == "" &&
|
|
req.Header.Get("Range") == "" &&
|
|
req.Method != "HEAD" {
|
|
|
|
cs.requestedGzip = true
|
|
}
|
|
|
|
hdrs := cc.encodeHeaders(req, cs.requestedGzip, trailers, contentLen)
|
|
cc.wmu.Lock()
|
|
endStream := !hasBody && !hasTrailers
|
|
werr := cc.writeHeaders(cs.ID, endStream, hdrs)
|
|
cc.wmu.Unlock()
|
|
cc.mu.Unlock()
|
|
|
|
if werr != nil {
|
|
if hasBody {
|
|
req.Body.Close()
|
|
}
|
|
cc.forgetStreamID(cs.ID)
|
|
|
|
return nil, werr
|
|
}
|
|
|
|
var respHeaderTimer <-chan time.Time
|
|
var bodyCopyErrc chan error // result of body copy
|
|
if hasBody {
|
|
bodyCopyErrc = make(chan error, 1)
|
|
go func() {
|
|
bodyCopyErrc <- cs.writeRequestBody(body, req.Body)
|
|
}()
|
|
} else {
|
|
if d := cc.responseHeaderTimeout(); d != 0 {
|
|
timer := time.NewTimer(d)
|
|
defer timer.Stop()
|
|
respHeaderTimer = timer.C
|
|
}
|
|
}
|
|
|
|
readLoopResCh := cs.resc
|
|
requestCanceledCh := http2requestCancel(req)
|
|
bodyWritten := false
|
|
|
|
for {
|
|
select {
|
|
case re := <-readLoopResCh:
|
|
res := re.res
|
|
if re.err != nil || res.StatusCode > 299 {
|
|
|
|
cs.abortRequestBodyWrite(http2errStopReqBodyWrite)
|
|
}
|
|
if re.err != nil {
|
|
cc.forgetStreamID(cs.ID)
|
|
return nil, re.err
|
|
}
|
|
res.Request = req
|
|
res.TLS = cc.tlsState
|
|
return res, nil
|
|
case <-respHeaderTimer:
|
|
cc.forgetStreamID(cs.ID)
|
|
if !hasBody || bodyWritten {
|
|
cc.writeStreamReset(cs.ID, http2ErrCodeCancel, nil)
|
|
} else {
|
|
cs.abortRequestBodyWrite(http2errStopReqBodyWriteAndCancel)
|
|
}
|
|
return nil, http2errTimeout
|
|
case <-requestCanceledCh:
|
|
cc.forgetStreamID(cs.ID)
|
|
if !hasBody || bodyWritten {
|
|
cc.writeStreamReset(cs.ID, http2ErrCodeCancel, nil)
|
|
} else {
|
|
cs.abortRequestBodyWrite(http2errStopReqBodyWriteAndCancel)
|
|
}
|
|
return nil, http2errRequestCanceled
|
|
case <-cs.peerReset:
|
|
|
|
return nil, cs.resetErr
|
|
case err := <-bodyCopyErrc:
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
bodyWritten = true
|
|
if d := cc.responseHeaderTimeout(); d != 0 {
|
|
timer := time.NewTimer(d)
|
|
defer timer.Stop()
|
|
respHeaderTimer = timer.C
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// requires cc.wmu be held
|
|
func (cc *http2ClientConn) writeHeaders(streamID uint32, endStream bool, hdrs []byte) error {
|
|
first := true
|
|
frameSize := int(cc.maxFrameSize)
|
|
for len(hdrs) > 0 && cc.werr == nil {
|
|
chunk := hdrs
|
|
if len(chunk) > frameSize {
|
|
chunk = chunk[:frameSize]
|
|
}
|
|
hdrs = hdrs[len(chunk):]
|
|
endHeaders := len(hdrs) == 0
|
|
if first {
|
|
cc.fr.WriteHeaders(http2HeadersFrameParam{
|
|
StreamID: streamID,
|
|
BlockFragment: chunk,
|
|
EndStream: endStream,
|
|
EndHeaders: endHeaders,
|
|
})
|
|
first = false
|
|
} else {
|
|
cc.fr.WriteContinuation(streamID, endHeaders, chunk)
|
|
}
|
|
}
|
|
|
|
cc.bw.Flush()
|
|
return cc.werr
|
|
}
|
|
|
|
// internal error values; they don't escape to callers
|
|
var (
|
|
// abort request body write; don't send cancel
|
|
http2errStopReqBodyWrite = errors.New("http2: aborting request body write")
|
|
|
|
// abort request body write, but send stream reset of cancel.
|
|
http2errStopReqBodyWriteAndCancel = errors.New("http2: canceling request")
|
|
)
|
|
|
|
func (cs *http2clientStream) writeRequestBody(body io.Reader, bodyCloser io.Closer) (err error) {
|
|
cc := cs.cc
|
|
sentEnd := false
|
|
buf := cc.frameScratchBuffer()
|
|
defer cc.putFrameScratchBuffer(buf)
|
|
|
|
defer func() {
|
|
|
|
cerr := bodyCloser.Close()
|
|
if err == nil {
|
|
err = cerr
|
|
}
|
|
}()
|
|
|
|
req := cs.req
|
|
hasTrailers := req.Trailer != nil
|
|
|
|
var sawEOF bool
|
|
for !sawEOF {
|
|
n, err := body.Read(buf)
|
|
if err == io.EOF {
|
|
sawEOF = true
|
|
err = nil
|
|
} else if err != nil {
|
|
return err
|
|
}
|
|
|
|
remain := buf[:n]
|
|
for len(remain) > 0 && err == nil {
|
|
var allowed int32
|
|
allowed, err = cs.awaitFlowControl(len(remain))
|
|
switch {
|
|
case err == http2errStopReqBodyWrite:
|
|
return err
|
|
case err == http2errStopReqBodyWriteAndCancel:
|
|
cc.writeStreamReset(cs.ID, http2ErrCodeCancel, nil)
|
|
return err
|
|
case err != nil:
|
|
return err
|
|
}
|
|
cc.wmu.Lock()
|
|
data := remain[:allowed]
|
|
remain = remain[allowed:]
|
|
sentEnd = sawEOF && len(remain) == 0 && !hasTrailers
|
|
err = cc.fr.WriteData(cs.ID, sentEnd, data)
|
|
if err == nil {
|
|
|
|
err = cc.bw.Flush()
|
|
}
|
|
cc.wmu.Unlock()
|
|
}
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
cc.wmu.Lock()
|
|
if !sentEnd {
|
|
var trls []byte
|
|
if hasTrailers {
|
|
cc.mu.Lock()
|
|
trls = cc.encodeTrailers(req)
|
|
cc.mu.Unlock()
|
|
}
|
|
|
|
if len(trls) > 0 {
|
|
err = cc.writeHeaders(cs.ID, true, trls)
|
|
} else {
|
|
err = cc.fr.WriteData(cs.ID, true, nil)
|
|
}
|
|
}
|
|
if ferr := cc.bw.Flush(); ferr != nil && err == nil {
|
|
err = ferr
|
|
}
|
|
cc.wmu.Unlock()
|
|
|
|
return err
|
|
}
|
|
|
|
// awaitFlowControl waits for [1, min(maxBytes, cc.cs.maxFrameSize)] flow
|
|
// control tokens from the server.
|
|
// It returns either the non-zero number of tokens taken or an error
|
|
// if the stream is dead.
|
|
func (cs *http2clientStream) awaitFlowControl(maxBytes int) (taken int32, err error) {
|
|
cc := cs.cc
|
|
cc.mu.Lock()
|
|
defer cc.mu.Unlock()
|
|
for {
|
|
if cc.closed {
|
|
return 0, http2errClientConnClosed
|
|
}
|
|
if cs.stopReqBody != nil {
|
|
return 0, cs.stopReqBody
|
|
}
|
|
if err := cs.checkReset(); err != nil {
|
|
return 0, err
|
|
}
|
|
if a := cs.flow.available(); a > 0 {
|
|
take := a
|
|
if int(take) > maxBytes {
|
|
|
|
take = int32(maxBytes)
|
|
}
|
|
if take > int32(cc.maxFrameSize) {
|
|
take = int32(cc.maxFrameSize)
|
|
}
|
|
cs.flow.take(take)
|
|
return take, nil
|
|
}
|
|
cc.cond.Wait()
|
|
}
|
|
}
|
|
|
|
type http2badStringError struct {
|
|
what string
|
|
str string
|
|
}
|
|
|
|
func (e *http2badStringError) Error() string { return fmt.Sprintf("%s %q", e.what, e.str) }
|
|
|
|
// requires cc.mu be held.
|
|
func (cc *http2ClientConn) encodeHeaders(req *Request, addGzipHeader bool, trailers string, contentLength int64) []byte {
|
|
cc.hbuf.Reset()
|
|
|
|
host := req.Host
|
|
if host == "" {
|
|
host = req.URL.Host
|
|
}
|
|
|
|
cc.writeHeader(":authority", host)
|
|
cc.writeHeader(":method", req.Method)
|
|
if req.Method != "CONNECT" {
|
|
cc.writeHeader(":path", req.URL.RequestURI())
|
|
cc.writeHeader(":scheme", "https")
|
|
}
|
|
if trailers != "" {
|
|
cc.writeHeader("trailer", trailers)
|
|
}
|
|
|
|
var didUA bool
|
|
for k, vv := range req.Header {
|
|
lowKey := strings.ToLower(k)
|
|
switch lowKey {
|
|
case "host", "content-length":
|
|
|
|
continue
|
|
case "connection", "proxy-connection", "transfer-encoding", "upgrade":
|
|
|
|
continue
|
|
case "user-agent":
|
|
|
|
didUA = true
|
|
if len(vv) < 1 {
|
|
continue
|
|
}
|
|
vv = vv[:1]
|
|
if vv[0] == "" {
|
|
continue
|
|
}
|
|
}
|
|
for _, v := range vv {
|
|
cc.writeHeader(lowKey, v)
|
|
}
|
|
}
|
|
if http2shouldSendReqContentLength(req.Method, contentLength) {
|
|
cc.writeHeader("content-length", strconv.FormatInt(contentLength, 10))
|
|
}
|
|
if addGzipHeader {
|
|
cc.writeHeader("accept-encoding", "gzip")
|
|
}
|
|
if !didUA {
|
|
cc.writeHeader("user-agent", http2defaultUserAgent)
|
|
}
|
|
return cc.hbuf.Bytes()
|
|
}
|
|
|
|
// shouldSendReqContentLength reports whether the http2.Transport should send
|
|
// a "content-length" request header. This logic is basically a copy of the net/http
|
|
// transferWriter.shouldSendContentLength.
|
|
// The contentLength is the corrected contentLength (so 0 means actually 0, not unknown).
|
|
// -1 means unknown.
|
|
func http2shouldSendReqContentLength(method string, contentLength int64) bool {
|
|
if contentLength > 0 {
|
|
return true
|
|
}
|
|
if contentLength < 0 {
|
|
return false
|
|
}
|
|
|
|
switch method {
|
|
case "POST", "PUT", "PATCH":
|
|
return true
|
|
default:
|
|
return false
|
|
}
|
|
}
|
|
|
|
// requires cc.mu be held.
|
|
func (cc *http2ClientConn) encodeTrailers(req *Request) []byte {
|
|
cc.hbuf.Reset()
|
|
for k, vv := range req.Trailer {
|
|
|
|
lowKey := strings.ToLower(k)
|
|
for _, v := range vv {
|
|
cc.writeHeader(lowKey, v)
|
|
}
|
|
}
|
|
return cc.hbuf.Bytes()
|
|
}
|
|
|
|
func (cc *http2ClientConn) writeHeader(name, value string) {
|
|
if http2VerboseLogs {
|
|
log.Printf("http2: Transport encoding header %q = %q", name, value)
|
|
}
|
|
cc.henc.WriteField(hpack.HeaderField{Name: name, Value: value})
|
|
}
|
|
|
|
type http2resAndError struct {
|
|
res *Response
|
|
err error
|
|
}
|
|
|
|
// requires cc.mu be held.
|
|
func (cc *http2ClientConn) newStream() *http2clientStream {
|
|
cs := &http2clientStream{
|
|
cc: cc,
|
|
ID: cc.nextStreamID,
|
|
resc: make(chan http2resAndError, 1),
|
|
peerReset: make(chan struct{}),
|
|
done: make(chan struct{}),
|
|
}
|
|
cs.flow.add(int32(cc.initialWindowSize))
|
|
cs.flow.setConnFlow(&cc.flow)
|
|
cs.inflow.add(http2transportDefaultStreamFlow)
|
|
cs.inflow.setConnFlow(&cc.inflow)
|
|
cc.nextStreamID += 2
|
|
cc.streams[cs.ID] = cs
|
|
return cs
|
|
}
|
|
|
|
func (cc *http2ClientConn) forgetStreamID(id uint32) {
|
|
cc.streamByID(id, true)
|
|
}
|
|
|
|
func (cc *http2ClientConn) streamByID(id uint32, andRemove bool) *http2clientStream {
|
|
cc.mu.Lock()
|
|
defer cc.mu.Unlock()
|
|
cs := cc.streams[id]
|
|
if andRemove && cs != nil && !cc.closed {
|
|
delete(cc.streams, id)
|
|
close(cs.done)
|
|
}
|
|
return cs
|
|
}
|
|
|
|
// clientConnReadLoop is the state owned by the clientConn's frame-reading readLoop.
|
|
type http2clientConnReadLoop struct {
|
|
cc *http2ClientConn
|
|
activeRes map[uint32]*http2clientStream // keyed by streamID
|
|
closeWhenIdle bool
|
|
|
|
hdec *hpack.Decoder
|
|
|
|
// Fields reset on each HEADERS:
|
|
nextRes *Response
|
|
sawRegHeader bool // saw non-pseudo header
|
|
reqMalformed error // non-nil once known to be malformed
|
|
lastHeaderEndsStream bool
|
|
headerListSize int64 // actually uint32, but easier math this way
|
|
}
|
|
|
|
// readLoop runs in its own goroutine and reads and dispatches frames.
|
|
func (cc *http2ClientConn) readLoop() {
|
|
rl := &http2clientConnReadLoop{
|
|
cc: cc,
|
|
activeRes: make(map[uint32]*http2clientStream),
|
|
}
|
|
rl.hdec = hpack.NewDecoder(http2initialHeaderTableSize, rl.onNewHeaderField)
|
|
|
|
defer rl.cleanup()
|
|
cc.readerErr = rl.run()
|
|
if ce, ok := cc.readerErr.(http2ConnectionError); ok {
|
|
cc.wmu.Lock()
|
|
cc.fr.WriteGoAway(0, http2ErrCode(ce), nil)
|
|
cc.wmu.Unlock()
|
|
}
|
|
}
|
|
|
|
func (rl *http2clientConnReadLoop) cleanup() {
|
|
cc := rl.cc
|
|
defer cc.tconn.Close()
|
|
defer cc.t.connPool().MarkDead(cc)
|
|
defer close(cc.readerDone)
|
|
|
|
err := cc.readerErr
|
|
if err == io.EOF {
|
|
err = io.ErrUnexpectedEOF
|
|
}
|
|
cc.mu.Lock()
|
|
for _, cs := range rl.activeRes {
|
|
cs.bufPipe.CloseWithError(err)
|
|
}
|
|
for _, cs := range cc.streams {
|
|
select {
|
|
case cs.resc <- http2resAndError{err: err}:
|
|
default:
|
|
}
|
|
close(cs.done)
|
|
}
|
|
cc.closed = true
|
|
cc.cond.Broadcast()
|
|
cc.mu.Unlock()
|
|
}
|
|
|
|
func (rl *http2clientConnReadLoop) run() error {
|
|
cc := rl.cc
|
|
rl.closeWhenIdle = cc.t.disableKeepAlives()
|
|
gotReply := false
|
|
for {
|
|
f, err := cc.fr.ReadFrame()
|
|
if err != nil {
|
|
cc.vlogf("Transport readFrame error: (%T) %v", err, err)
|
|
}
|
|
if se, ok := err.(http2StreamError); ok {
|
|
|
|
return se
|
|
} else if err != nil {
|
|
return err
|
|
}
|
|
if http2VerboseLogs {
|
|
cc.vlogf("http2: Transport received %s", http2summarizeFrame(f))
|
|
}
|
|
maybeIdle := false
|
|
|
|
switch f := f.(type) {
|
|
case *http2HeadersFrame:
|
|
err = rl.processHeaders(f)
|
|
maybeIdle = true
|
|
gotReply = true
|
|
case *http2ContinuationFrame:
|
|
err = rl.processContinuation(f)
|
|
maybeIdle = true
|
|
case *http2DataFrame:
|
|
err = rl.processData(f)
|
|
maybeIdle = true
|
|
case *http2GoAwayFrame:
|
|
err = rl.processGoAway(f)
|
|
maybeIdle = true
|
|
case *http2RSTStreamFrame:
|
|
err = rl.processResetStream(f)
|
|
maybeIdle = true
|
|
case *http2SettingsFrame:
|
|
err = rl.processSettings(f)
|
|
case *http2PushPromiseFrame:
|
|
err = rl.processPushPromise(f)
|
|
case *http2WindowUpdateFrame:
|
|
err = rl.processWindowUpdate(f)
|
|
case *http2PingFrame:
|
|
err = rl.processPing(f)
|
|
default:
|
|
cc.logf("Transport: unhandled response frame type %T", f)
|
|
}
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if rl.closeWhenIdle && gotReply && maybeIdle && len(rl.activeRes) == 0 {
|
|
cc.closeIfIdle()
|
|
}
|
|
}
|
|
}
|
|
|
|
func (rl *http2clientConnReadLoop) processHeaders(f *http2HeadersFrame) error {
|
|
rl.sawRegHeader = false
|
|
rl.reqMalformed = nil
|
|
rl.lastHeaderEndsStream = f.StreamEnded()
|
|
rl.headerListSize = 0
|
|
rl.nextRes = &Response{
|
|
Proto: "HTTP/2.0",
|
|
ProtoMajor: 2,
|
|
Header: make(Header),
|
|
}
|
|
rl.hdec.SetEmitEnabled(true)
|
|
return rl.processHeaderBlockFragment(f.HeaderBlockFragment(), f.StreamID, f.HeadersEnded())
|
|
}
|
|
|
|
func (rl *http2clientConnReadLoop) processContinuation(f *http2ContinuationFrame) error {
|
|
return rl.processHeaderBlockFragment(f.HeaderBlockFragment(), f.StreamID, f.HeadersEnded())
|
|
}
|
|
|
|
func (rl *http2clientConnReadLoop) processHeaderBlockFragment(frag []byte, streamID uint32, finalFrag bool) error {
|
|
cc := rl.cc
|
|
streamEnded := rl.lastHeaderEndsStream
|
|
cs := cc.streamByID(streamID, streamEnded && finalFrag)
|
|
if cs == nil {
|
|
|
|
return nil
|
|
}
|
|
if cs.pastHeaders {
|
|
rl.hdec.SetEmitFunc(func(f hpack.HeaderField) { rl.onNewTrailerField(cs, f) })
|
|
} else {
|
|
rl.hdec.SetEmitFunc(rl.onNewHeaderField)
|
|
}
|
|
_, err := rl.hdec.Write(frag)
|
|
if err != nil {
|
|
return http2ConnectionError(http2ErrCodeCompression)
|
|
}
|
|
if finalFrag {
|
|
if err := rl.hdec.Close(); err != nil {
|
|
return http2ConnectionError(http2ErrCodeCompression)
|
|
}
|
|
}
|
|
|
|
if !finalFrag {
|
|
return nil
|
|
}
|
|
|
|
if !cs.pastHeaders {
|
|
cs.pastHeaders = true
|
|
} else {
|
|
|
|
if cs.pastTrailers {
|
|
|
|
return http2ConnectionError(http2ErrCodeProtocol)
|
|
}
|
|
cs.pastTrailers = true
|
|
if !streamEnded {
|
|
|
|
return http2ConnectionError(http2ErrCodeProtocol)
|
|
}
|
|
rl.endStream(cs)
|
|
return nil
|
|
}
|
|
|
|
if rl.reqMalformed != nil {
|
|
cs.resc <- http2resAndError{err: rl.reqMalformed}
|
|
rl.cc.writeStreamReset(cs.ID, http2ErrCodeProtocol, rl.reqMalformed)
|
|
return nil
|
|
}
|
|
|
|
res := rl.nextRes
|
|
|
|
if res.StatusCode == 100 {
|
|
|
|
cs.pastHeaders = false
|
|
return nil
|
|
}
|
|
|
|
if !streamEnded || cs.req.Method == "HEAD" {
|
|
res.ContentLength = -1
|
|
if clens := res.Header["Content-Length"]; len(clens) == 1 {
|
|
if clen64, err := strconv.ParseInt(clens[0], 10, 64); err == nil {
|
|
res.ContentLength = clen64
|
|
} else {
|
|
|
|
}
|
|
} else if len(clens) > 1 {
|
|
|
|
}
|
|
}
|
|
|
|
if streamEnded {
|
|
res.Body = http2noBody
|
|
} else {
|
|
buf := new(bytes.Buffer)
|
|
cs.bufPipe = http2pipe{b: buf}
|
|
cs.bytesRemain = res.ContentLength
|
|
res.Body = http2transportResponseBody{cs}
|
|
go cs.awaitRequestCancel(http2requestCancel(cs.req))
|
|
|
|
if cs.requestedGzip && res.Header.Get("Content-Encoding") == "gzip" {
|
|
res.Header.Del("Content-Encoding")
|
|
res.Header.Del("Content-Length")
|
|
res.ContentLength = -1
|
|
res.Body = &http2gzipReader{body: res.Body}
|
|
}
|
|
rl.activeRes[cs.ID] = cs
|
|
}
|
|
|
|
cs.resTrailer = &res.Trailer
|
|
cs.resc <- http2resAndError{res: res}
|
|
rl.nextRes = nil
|
|
return nil
|
|
}
|
|
|
|
// transportResponseBody is the concrete type of Transport.RoundTrip's
|
|
// Response.Body. It is an io.ReadCloser. On Read, it reads from cs.body.
|
|
// On Close it sends RST_STREAM if EOF wasn't already seen.
|
|
type http2transportResponseBody struct {
|
|
cs *http2clientStream
|
|
}
|
|
|
|
func (b http2transportResponseBody) Read(p []byte) (n int, err error) {
|
|
cs := b.cs
|
|
cc := cs.cc
|
|
|
|
if cs.readErr != nil {
|
|
return 0, cs.readErr
|
|
}
|
|
n, err = b.cs.bufPipe.Read(p)
|
|
if cs.bytesRemain != -1 {
|
|
if int64(n) > cs.bytesRemain {
|
|
n = int(cs.bytesRemain)
|
|
if err == nil {
|
|
err = errors.New("net/http: server replied with more than declared Content-Length; truncated")
|
|
cc.writeStreamReset(cs.ID, http2ErrCodeProtocol, err)
|
|
}
|
|
cs.readErr = err
|
|
return int(cs.bytesRemain), err
|
|
}
|
|
cs.bytesRemain -= int64(n)
|
|
if err == io.EOF && cs.bytesRemain > 0 {
|
|
err = io.ErrUnexpectedEOF
|
|
cs.readErr = err
|
|
return n, err
|
|
}
|
|
}
|
|
if n == 0 {
|
|
|
|
return
|
|
}
|
|
|
|
cc.mu.Lock()
|
|
defer cc.mu.Unlock()
|
|
|
|
var connAdd, streamAdd int32
|
|
|
|
if v := cc.inflow.available(); v < http2transportDefaultConnFlow/2 {
|
|
connAdd = http2transportDefaultConnFlow - v
|
|
cc.inflow.add(connAdd)
|
|
}
|
|
if err == nil {
|
|
if v := cs.inflow.available(); v < http2transportDefaultStreamFlow-http2transportDefaultStreamMinRefresh {
|
|
streamAdd = http2transportDefaultStreamFlow - v
|
|
cs.inflow.add(streamAdd)
|
|
}
|
|
}
|
|
if connAdd != 0 || streamAdd != 0 {
|
|
cc.wmu.Lock()
|
|
defer cc.wmu.Unlock()
|
|
if connAdd != 0 {
|
|
cc.fr.WriteWindowUpdate(0, http2mustUint31(connAdd))
|
|
}
|
|
if streamAdd != 0 {
|
|
cc.fr.WriteWindowUpdate(cs.ID, http2mustUint31(streamAdd))
|
|
}
|
|
cc.bw.Flush()
|
|
}
|
|
return
|
|
}
|
|
|
|
var http2errClosedResponseBody = errors.New("http2: response body closed")
|
|
|
|
func (b http2transportResponseBody) Close() error {
|
|
cs := b.cs
|
|
if cs.bufPipe.Err() != io.EOF {
|
|
|
|
cs.cc.writeStreamReset(cs.ID, http2ErrCodeCancel, nil)
|
|
}
|
|
cs.bufPipe.BreakWithError(http2errClosedResponseBody)
|
|
return nil
|
|
}
|
|
|
|
func (rl *http2clientConnReadLoop) processData(f *http2DataFrame) error {
|
|
cc := rl.cc
|
|
cs := cc.streamByID(f.StreamID, f.StreamEnded())
|
|
if cs == nil {
|
|
cc.mu.Lock()
|
|
neverSent := cc.nextStreamID
|
|
cc.mu.Unlock()
|
|
if f.StreamID >= neverSent {
|
|
|
|
cc.logf("http2: Transport received unsolicited DATA frame; closing connection")
|
|
return http2ConnectionError(http2ErrCodeProtocol)
|
|
}
|
|
|
|
return nil
|
|
}
|
|
if data := f.Data(); len(data) > 0 {
|
|
if cs.bufPipe.b == nil {
|
|
|
|
cc.logf("http2: Transport received DATA frame for closed stream; closing connection")
|
|
return http2ConnectionError(http2ErrCodeProtocol)
|
|
}
|
|
|
|
cc.mu.Lock()
|
|
if cs.inflow.available() >= int32(len(data)) {
|
|
cs.inflow.take(int32(len(data)))
|
|
} else {
|
|
cc.mu.Unlock()
|
|
return http2ConnectionError(http2ErrCodeFlowControl)
|
|
}
|
|
cc.mu.Unlock()
|
|
|
|
if _, err := cs.bufPipe.Write(data); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
if f.StreamEnded() {
|
|
rl.endStream(cs)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
var http2errInvalidTrailers = errors.New("http2: invalid trailers")
|
|
|
|
func (rl *http2clientConnReadLoop) endStream(cs *http2clientStream) {
|
|
|
|
err := io.EOF
|
|
code := cs.copyTrailers
|
|
if rl.reqMalformed != nil {
|
|
err = rl.reqMalformed
|
|
code = nil
|
|
}
|
|
cs.bufPipe.closeWithErrorAndCode(err, code)
|
|
delete(rl.activeRes, cs.ID)
|
|
if cs.req.Close || cs.req.Header.Get("Connection") == "close" {
|
|
rl.closeWhenIdle = true
|
|
}
|
|
}
|
|
|
|
func (cs *http2clientStream) copyTrailers() {
|
|
for k, vv := range cs.trailer {
|
|
t := cs.resTrailer
|
|
if *t == nil {
|
|
*t = make(Header)
|
|
}
|
|
(*t)[k] = vv
|
|
}
|
|
}
|
|
|
|
func (rl *http2clientConnReadLoop) processGoAway(f *http2GoAwayFrame) error {
|
|
cc := rl.cc
|
|
cc.t.connPool().MarkDead(cc)
|
|
if f.ErrCode != 0 {
|
|
|
|
cc.vlogf("transport got GOAWAY with error code = %v", f.ErrCode)
|
|
}
|
|
cc.setGoAway(f)
|
|
return nil
|
|
}
|
|
|
|
func (rl *http2clientConnReadLoop) processSettings(f *http2SettingsFrame) error {
|
|
cc := rl.cc
|
|
cc.mu.Lock()
|
|
defer cc.mu.Unlock()
|
|
return f.ForeachSetting(func(s http2Setting) error {
|
|
switch s.ID {
|
|
case http2SettingMaxFrameSize:
|
|
cc.maxFrameSize = s.Val
|
|
case http2SettingMaxConcurrentStreams:
|
|
cc.maxConcurrentStreams = s.Val
|
|
case http2SettingInitialWindowSize:
|
|
|
|
cc.initialWindowSize = s.Val
|
|
default:
|
|
|
|
cc.vlogf("Unhandled Setting: %v", s)
|
|
}
|
|
return nil
|
|
})
|
|
}
|
|
|
|
func (rl *http2clientConnReadLoop) processWindowUpdate(f *http2WindowUpdateFrame) error {
|
|
cc := rl.cc
|
|
cs := cc.streamByID(f.StreamID, false)
|
|
if f.StreamID != 0 && cs == nil {
|
|
return nil
|
|
}
|
|
|
|
cc.mu.Lock()
|
|
defer cc.mu.Unlock()
|
|
|
|
fl := &cc.flow
|
|
if cs != nil {
|
|
fl = &cs.flow
|
|
}
|
|
if !fl.add(int32(f.Increment)) {
|
|
return http2ConnectionError(http2ErrCodeFlowControl)
|
|
}
|
|
cc.cond.Broadcast()
|
|
return nil
|
|
}
|
|
|
|
func (rl *http2clientConnReadLoop) processResetStream(f *http2RSTStreamFrame) error {
|
|
cs := rl.cc.streamByID(f.StreamID, true)
|
|
if cs == nil {
|
|
|
|
return nil
|
|
}
|
|
select {
|
|
case <-cs.peerReset:
|
|
|
|
default:
|
|
err := http2StreamError{cs.ID, f.ErrCode}
|
|
cs.resetErr = err
|
|
close(cs.peerReset)
|
|
cs.bufPipe.CloseWithError(err)
|
|
cs.cc.cond.Broadcast()
|
|
}
|
|
delete(rl.activeRes, cs.ID)
|
|
return nil
|
|
}
|
|
|
|
func (rl *http2clientConnReadLoop) processPing(f *http2PingFrame) error {
|
|
if f.IsAck() {
|
|
|
|
return nil
|
|
}
|
|
cc := rl.cc
|
|
cc.wmu.Lock()
|
|
defer cc.wmu.Unlock()
|
|
if err := cc.fr.WritePing(true, f.Data); err != nil {
|
|
return err
|
|
}
|
|
return cc.bw.Flush()
|
|
}
|
|
|
|
func (rl *http2clientConnReadLoop) processPushPromise(f *http2PushPromiseFrame) error {
|
|
|
|
return http2ConnectionError(http2ErrCodeProtocol)
|
|
}
|
|
|
|
func (cc *http2ClientConn) writeStreamReset(streamID uint32, code http2ErrCode, err error) {
|
|
|
|
cc.wmu.Lock()
|
|
cc.fr.WriteRSTStream(streamID, code)
|
|
cc.bw.Flush()
|
|
cc.wmu.Unlock()
|
|
}
|
|
|
|
var (
|
|
http2errResponseHeaderListSize = errors.New("http2: response header list larger than advertised limit")
|
|
http2errPseudoTrailers = errors.New("http2: invalid pseudo header in trailers")
|
|
)
|
|
|
|
func (rl *http2clientConnReadLoop) checkHeaderField(f hpack.HeaderField) bool {
|
|
if rl.reqMalformed != nil {
|
|
return false
|
|
}
|
|
|
|
const headerFieldOverhead = 32 // per spec
|
|
rl.headerListSize += int64(len(f.Name)) + int64(len(f.Value)) + headerFieldOverhead
|
|
if max := rl.cc.t.maxHeaderListSize(); max != 0 && rl.headerListSize > int64(max) {
|
|
rl.hdec.SetEmitEnabled(false)
|
|
rl.reqMalformed = http2errResponseHeaderListSize
|
|
return false
|
|
}
|
|
|
|
if !http2validHeaderFieldValue(f.Value) {
|
|
rl.reqMalformed = http2errInvalidHeaderFieldValue
|
|
return false
|
|
}
|
|
|
|
isPseudo := strings.HasPrefix(f.Name, ":")
|
|
if isPseudo {
|
|
if rl.sawRegHeader {
|
|
rl.reqMalformed = errors.New("http2: invalid pseudo header after regular header")
|
|
return false
|
|
}
|
|
} else {
|
|
if !http2validHeaderFieldName(f.Name) {
|
|
rl.reqMalformed = http2errInvalidHeaderFieldName
|
|
return false
|
|
}
|
|
rl.sawRegHeader = true
|
|
}
|
|
|
|
return true
|
|
}
|
|
|
|
// onNewHeaderField runs on the readLoop goroutine whenever a new
|
|
// hpack header field is decoded.
|
|
func (rl *http2clientConnReadLoop) onNewHeaderField(f hpack.HeaderField) {
|
|
cc := rl.cc
|
|
if http2VerboseLogs {
|
|
cc.logf("http2: Transport decoded %v", f)
|
|
}
|
|
|
|
if !rl.checkHeaderField(f) {
|
|
return
|
|
}
|
|
|
|
isPseudo := strings.HasPrefix(f.Name, ":")
|
|
if isPseudo {
|
|
switch f.Name {
|
|
case ":status":
|
|
code, err := strconv.Atoi(f.Value)
|
|
if err != nil {
|
|
rl.reqMalformed = errors.New("http2: invalid :status")
|
|
return
|
|
}
|
|
rl.nextRes.Status = f.Value + " " + StatusText(code)
|
|
rl.nextRes.StatusCode = code
|
|
default:
|
|
|
|
rl.reqMalformed = fmt.Errorf("http2: unknown response pseudo header %q", f.Name)
|
|
}
|
|
return
|
|
}
|
|
|
|
key := CanonicalHeaderKey(f.Name)
|
|
if key == "Trailer" {
|
|
t := rl.nextRes.Trailer
|
|
if t == nil {
|
|
t = make(Header)
|
|
rl.nextRes.Trailer = t
|
|
}
|
|
http2foreachHeaderElement(f.Value, func(v string) {
|
|
t[CanonicalHeaderKey(v)] = nil
|
|
})
|
|
} else {
|
|
rl.nextRes.Header.Add(key, f.Value)
|
|
}
|
|
}
|
|
|
|
func (rl *http2clientConnReadLoop) onNewTrailerField(cs *http2clientStream, f hpack.HeaderField) {
|
|
if http2VerboseLogs {
|
|
rl.cc.logf("http2: Transport decoded trailer %v", f)
|
|
}
|
|
if !rl.checkHeaderField(f) {
|
|
return
|
|
}
|
|
if strings.HasPrefix(f.Name, ":") {
|
|
|
|
rl.reqMalformed = http2errPseudoTrailers
|
|
return
|
|
}
|
|
|
|
key := CanonicalHeaderKey(f.Name)
|
|
|
|
// The spec says one must predeclare their trailers but in practice
|
|
// popular users (which is to say the only user we found) do not so we
|
|
// violate the spec and accept all of them.
|
|
const acceptAllTrailers = true
|
|
if _, ok := (*cs.resTrailer)[key]; ok || acceptAllTrailers {
|
|
if cs.trailer == nil {
|
|
cs.trailer = make(Header)
|
|
}
|
|
cs.trailer[key] = append(cs.trailer[key], f.Value)
|
|
}
|
|
}
|
|
|
|
func (cc *http2ClientConn) logf(format string, args ...interface{}) {
|
|
cc.t.logf(format, args...)
|
|
}
|
|
|
|
func (cc *http2ClientConn) vlogf(format string, args ...interface{}) {
|
|
cc.t.vlogf(format, args...)
|
|
}
|
|
|
|
func (t *http2Transport) vlogf(format string, args ...interface{}) {
|
|
if http2VerboseLogs {
|
|
t.logf(format, args...)
|
|
}
|
|
}
|
|
|
|
func (t *http2Transport) logf(format string, args ...interface{}) {
|
|
log.Printf(format, args...)
|
|
}
|
|
|
|
var http2noBody io.ReadCloser = ioutil.NopCloser(bytes.NewReader(nil))
|
|
|
|
func http2strSliceContains(ss []string, s string) bool {
|
|
for _, v := range ss {
|
|
if v == s {
|
|
return true
|
|
}
|
|
}
|
|
return false
|
|
}
|
|
|
|
type http2erringRoundTripper struct{ err error }
|
|
|
|
func (rt http2erringRoundTripper) RoundTrip(*Request) (*Response, error) { return nil, rt.err }
|
|
|
|
// gzipReader wraps a response body so it can lazily
|
|
// call gzip.NewReader on the first call to Read
|
|
type http2gzipReader struct {
|
|
body io.ReadCloser // underlying Response.Body
|
|
zr *gzip.Reader // lazily-initialized gzip reader
|
|
zerr error // sticky error
|
|
}
|
|
|
|
func (gz *http2gzipReader) Read(p []byte) (n int, err error) {
|
|
if gz.zerr != nil {
|
|
return 0, gz.zerr
|
|
}
|
|
if gz.zr == nil {
|
|
gz.zr, err = gzip.NewReader(gz.body)
|
|
if err != nil {
|
|
gz.zerr = err
|
|
return 0, err
|
|
}
|
|
}
|
|
return gz.zr.Read(p)
|
|
}
|
|
|
|
func (gz *http2gzipReader) Close() error {
|
|
return gz.body.Close()
|
|
}
|
|
|
|
type http2errorReader struct{ err error }
|
|
|
|
func (r http2errorReader) Read(p []byte) (int, error) { return 0, r.err }
|
|
|
|
// writeFramer is implemented by any type that is used to write frames.
|
|
type http2writeFramer interface {
|
|
writeFrame(http2writeContext) error
|
|
}
|
|
|
|
// writeContext is the interface needed by the various frame writer
|
|
// types below. All the writeFrame methods below are scheduled via the
|
|
// frame writing scheduler (see writeScheduler in writesched.go).
|
|
//
|
|
// This interface is implemented by *serverConn.
|
|
//
|
|
// TODO: decide whether to a) use this in the client code (which didn't
|
|
// end up using this yet, because it has a simpler design, not
|
|
// currently implementing priorities), or b) delete this and
|
|
// make the server code a bit more concrete.
|
|
type http2writeContext interface {
|
|
Framer() *http2Framer
|
|
Flush() error
|
|
CloseConn() error
|
|
// HeaderEncoder returns an HPACK encoder that writes to the
|
|
// returned buffer.
|
|
HeaderEncoder() (*hpack.Encoder, *bytes.Buffer)
|
|
}
|
|
|
|
// endsStream reports whether the given frame writer w will locally
|
|
// close the stream.
|
|
func http2endsStream(w http2writeFramer) bool {
|
|
switch v := w.(type) {
|
|
case *http2writeData:
|
|
return v.endStream
|
|
case *http2writeResHeaders:
|
|
return v.endStream
|
|
case nil:
|
|
|
|
panic("endsStream called on nil writeFramer")
|
|
}
|
|
return false
|
|
}
|
|
|
|
type http2flushFrameWriter struct{}
|
|
|
|
func (http2flushFrameWriter) writeFrame(ctx http2writeContext) error {
|
|
return ctx.Flush()
|
|
}
|
|
|
|
type http2writeSettings []http2Setting
|
|
|
|
func (s http2writeSettings) writeFrame(ctx http2writeContext) error {
|
|
return ctx.Framer().WriteSettings([]http2Setting(s)...)
|
|
}
|
|
|
|
type http2writeGoAway struct {
|
|
maxStreamID uint32
|
|
code http2ErrCode
|
|
}
|
|
|
|
func (p *http2writeGoAway) writeFrame(ctx http2writeContext) error {
|
|
err := ctx.Framer().WriteGoAway(p.maxStreamID, p.code, nil)
|
|
if p.code != 0 {
|
|
ctx.Flush()
|
|
time.Sleep(50 * time.Millisecond)
|
|
ctx.CloseConn()
|
|
}
|
|
return err
|
|
}
|
|
|
|
type http2writeData struct {
|
|
streamID uint32
|
|
p []byte
|
|
endStream bool
|
|
}
|
|
|
|
func (w *http2writeData) String() string {
|
|
return fmt.Sprintf("writeData(stream=%d, p=%d, endStream=%v)", w.streamID, len(w.p), w.endStream)
|
|
}
|
|
|
|
func (w *http2writeData) writeFrame(ctx http2writeContext) error {
|
|
return ctx.Framer().WriteData(w.streamID, w.endStream, w.p)
|
|
}
|
|
|
|
// handlerPanicRST is the message sent from handler goroutines when
|
|
// the handler panics.
|
|
type http2handlerPanicRST struct {
|
|
StreamID uint32
|
|
}
|
|
|
|
func (hp http2handlerPanicRST) writeFrame(ctx http2writeContext) error {
|
|
return ctx.Framer().WriteRSTStream(hp.StreamID, http2ErrCodeInternal)
|
|
}
|
|
|
|
func (se http2StreamError) writeFrame(ctx http2writeContext) error {
|
|
return ctx.Framer().WriteRSTStream(se.StreamID, se.Code)
|
|
}
|
|
|
|
type http2writePingAck struct{ pf *http2PingFrame }
|
|
|
|
func (w http2writePingAck) writeFrame(ctx http2writeContext) error {
|
|
return ctx.Framer().WritePing(true, w.pf.Data)
|
|
}
|
|
|
|
type http2writeSettingsAck struct{}
|
|
|
|
func (http2writeSettingsAck) writeFrame(ctx http2writeContext) error {
|
|
return ctx.Framer().WriteSettingsAck()
|
|
}
|
|
|
|
// writeResHeaders is a request to write a HEADERS and 0+ CONTINUATION frames
|
|
// for HTTP response headers or trailers from a server handler.
|
|
type http2writeResHeaders struct {
|
|
streamID uint32
|
|
httpResCode int // 0 means no ":status" line
|
|
h Header // may be nil
|
|
trailers []string // if non-nil, which keys of h to write. nil means all.
|
|
endStream bool
|
|
|
|
date string
|
|
contentType string
|
|
contentLength string
|
|
}
|
|
|
|
func http2encKV(enc *hpack.Encoder, k, v string) {
|
|
if http2VerboseLogs {
|
|
log.Printf("http2: server encoding header %q = %q", k, v)
|
|
}
|
|
enc.WriteField(hpack.HeaderField{Name: k, Value: v})
|
|
}
|
|
|
|
func (w *http2writeResHeaders) writeFrame(ctx http2writeContext) error {
|
|
enc, buf := ctx.HeaderEncoder()
|
|
buf.Reset()
|
|
|
|
if w.httpResCode != 0 {
|
|
http2encKV(enc, ":status", http2httpCodeString(w.httpResCode))
|
|
}
|
|
|
|
http2encodeHeaders(enc, w.h, w.trailers)
|
|
|
|
if w.contentType != "" {
|
|
http2encKV(enc, "content-type", w.contentType)
|
|
}
|
|
if w.contentLength != "" {
|
|
http2encKV(enc, "content-length", w.contentLength)
|
|
}
|
|
if w.date != "" {
|
|
http2encKV(enc, "date", w.date)
|
|
}
|
|
|
|
headerBlock := buf.Bytes()
|
|
if len(headerBlock) == 0 && w.trailers == nil {
|
|
panic("unexpected empty hpack")
|
|
}
|
|
|
|
// For now we're lazy and just pick the minimum MAX_FRAME_SIZE
|
|
// that all peers must support (16KB). Later we could care
|
|
// more and send larger frames if the peer advertised it, but
|
|
// there's little point. Most headers are small anyway (so we
|
|
// generally won't have CONTINUATION frames), and extra frames
|
|
// only waste 9 bytes anyway.
|
|
const maxFrameSize = 16384
|
|
|
|
first := true
|
|
for len(headerBlock) > 0 {
|
|
frag := headerBlock
|
|
if len(frag) > maxFrameSize {
|
|
frag = frag[:maxFrameSize]
|
|
}
|
|
headerBlock = headerBlock[len(frag):]
|
|
endHeaders := len(headerBlock) == 0
|
|
var err error
|
|
if first {
|
|
first = false
|
|
err = ctx.Framer().WriteHeaders(http2HeadersFrameParam{
|
|
StreamID: w.streamID,
|
|
BlockFragment: frag,
|
|
EndStream: w.endStream,
|
|
EndHeaders: endHeaders,
|
|
})
|
|
} else {
|
|
err = ctx.Framer().WriteContinuation(w.streamID, endHeaders, frag)
|
|
}
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
type http2write100ContinueHeadersFrame struct {
|
|
streamID uint32
|
|
}
|
|
|
|
func (w http2write100ContinueHeadersFrame) writeFrame(ctx http2writeContext) error {
|
|
enc, buf := ctx.HeaderEncoder()
|
|
buf.Reset()
|
|
http2encKV(enc, ":status", "100")
|
|
return ctx.Framer().WriteHeaders(http2HeadersFrameParam{
|
|
StreamID: w.streamID,
|
|
BlockFragment: buf.Bytes(),
|
|
EndStream: false,
|
|
EndHeaders: true,
|
|
})
|
|
}
|
|
|
|
type http2writeWindowUpdate struct {
|
|
streamID uint32 // or 0 for conn-level
|
|
n uint32
|
|
}
|
|
|
|
func (wu http2writeWindowUpdate) writeFrame(ctx http2writeContext) error {
|
|
return ctx.Framer().WriteWindowUpdate(wu.streamID, wu.n)
|
|
}
|
|
|
|
func http2encodeHeaders(enc *hpack.Encoder, h Header, keys []string) {
|
|
|
|
if keys == nil {
|
|
keys = make([]string, 0, len(h))
|
|
for k := range h {
|
|
keys = append(keys, k)
|
|
}
|
|
sort.Strings(keys)
|
|
}
|
|
for _, k := range keys {
|
|
vv := h[k]
|
|
k = http2lowerHeader(k)
|
|
if !http2validHeaderFieldName(k) {
|
|
|
|
continue
|
|
}
|
|
isTE := k == "transfer-encoding"
|
|
for _, v := range vv {
|
|
if !http2validHeaderFieldValue(v) {
|
|
|
|
continue
|
|
}
|
|
|
|
if isTE && v != "trailers" {
|
|
continue
|
|
}
|
|
http2encKV(enc, k, v)
|
|
}
|
|
}
|
|
}
|
|
|
|
// frameWriteMsg is a request to write a frame.
|
|
type http2frameWriteMsg struct {
|
|
// write is the interface value that does the writing, once the
|
|
// writeScheduler (below) has decided to select this frame
|
|
// to write. The write functions are all defined in write.go.
|
|
write http2writeFramer
|
|
|
|
stream *http2stream // used for prioritization. nil for non-stream frames.
|
|
|
|
// done, if non-nil, must be a buffered channel with space for
|
|
// 1 message and is sent the return value from write (or an
|
|
// earlier error) when the frame has been written.
|
|
done chan error
|
|
}
|
|
|
|
// for debugging only:
|
|
func (wm http2frameWriteMsg) String() string {
|
|
var streamID uint32
|
|
if wm.stream != nil {
|
|
streamID = wm.stream.id
|
|
}
|
|
var des string
|
|
if s, ok := wm.write.(fmt.Stringer); ok {
|
|
des = s.String()
|
|
} else {
|
|
des = fmt.Sprintf("%T", wm.write)
|
|
}
|
|
return fmt.Sprintf("[frameWriteMsg stream=%d, ch=%v, type: %v]", streamID, wm.done != nil, des)
|
|
}
|
|
|
|
// writeScheduler tracks pending frames to write, priorities, and decides
|
|
// the next one to use. It is not thread-safe.
|
|
type http2writeScheduler struct {
|
|
// zero are frames not associated with a specific stream.
|
|
// They're sent before any stream-specific freams.
|
|
zero http2writeQueue
|
|
|
|
// maxFrameSize is the maximum size of a DATA frame
|
|
// we'll write. Must be non-zero and between 16K-16M.
|
|
maxFrameSize uint32
|
|
|
|
// sq contains the stream-specific queues, keyed by stream ID.
|
|
// when a stream is idle, it's deleted from the map.
|
|
sq map[uint32]*http2writeQueue
|
|
|
|
// canSend is a slice of memory that's reused between frame
|
|
// scheduling decisions to hold the list of writeQueues (from sq)
|
|
// which have enough flow control data to send. After canSend is
|
|
// built, the best is selected.
|
|
canSend []*http2writeQueue
|
|
|
|
// pool of empty queues for reuse.
|
|
queuePool []*http2writeQueue
|
|
}
|
|
|
|
func (ws *http2writeScheduler) putEmptyQueue(q *http2writeQueue) {
|
|
if len(q.s) != 0 {
|
|
panic("queue must be empty")
|
|
}
|
|
ws.queuePool = append(ws.queuePool, q)
|
|
}
|
|
|
|
func (ws *http2writeScheduler) getEmptyQueue() *http2writeQueue {
|
|
ln := len(ws.queuePool)
|
|
if ln == 0 {
|
|
return new(http2writeQueue)
|
|
}
|
|
q := ws.queuePool[ln-1]
|
|
ws.queuePool = ws.queuePool[:ln-1]
|
|
return q
|
|
}
|
|
|
|
func (ws *http2writeScheduler) empty() bool { return ws.zero.empty() && len(ws.sq) == 0 }
|
|
|
|
func (ws *http2writeScheduler) add(wm http2frameWriteMsg) {
|
|
st := wm.stream
|
|
if st == nil {
|
|
ws.zero.push(wm)
|
|
} else {
|
|
ws.streamQueue(st.id).push(wm)
|
|
}
|
|
}
|
|
|
|
func (ws *http2writeScheduler) streamQueue(streamID uint32) *http2writeQueue {
|
|
if q, ok := ws.sq[streamID]; ok {
|
|
return q
|
|
}
|
|
if ws.sq == nil {
|
|
ws.sq = make(map[uint32]*http2writeQueue)
|
|
}
|
|
q := ws.getEmptyQueue()
|
|
ws.sq[streamID] = q
|
|
return q
|
|
}
|
|
|
|
// take returns the most important frame to write and removes it from the scheduler.
|
|
// It is illegal to call this if the scheduler is empty or if there are no connection-level
|
|
// flow control bytes available.
|
|
func (ws *http2writeScheduler) take() (wm http2frameWriteMsg, ok bool) {
|
|
if ws.maxFrameSize == 0 {
|
|
panic("internal error: ws.maxFrameSize not initialized or invalid")
|
|
}
|
|
|
|
if !ws.zero.empty() {
|
|
return ws.zero.shift(), true
|
|
}
|
|
if len(ws.sq) == 0 {
|
|
return
|
|
}
|
|
|
|
for id, q := range ws.sq {
|
|
if q.firstIsNoCost() {
|
|
return ws.takeFrom(id, q)
|
|
}
|
|
}
|
|
|
|
if len(ws.canSend) != 0 {
|
|
panic("should be empty")
|
|
}
|
|
for _, q := range ws.sq {
|
|
if n := ws.streamWritableBytes(q); n > 0 {
|
|
ws.canSend = append(ws.canSend, q)
|
|
}
|
|
}
|
|
if len(ws.canSend) == 0 {
|
|
return
|
|
}
|
|
defer ws.zeroCanSend()
|
|
|
|
q := ws.canSend[0]
|
|
|
|
return ws.takeFrom(q.streamID(), q)
|
|
}
|
|
|
|
// zeroCanSend is defered from take.
|
|
func (ws *http2writeScheduler) zeroCanSend() {
|
|
for i := range ws.canSend {
|
|
ws.canSend[i] = nil
|
|
}
|
|
ws.canSend = ws.canSend[:0]
|
|
}
|
|
|
|
// streamWritableBytes returns the number of DATA bytes we could write
|
|
// from the given queue's stream, if this stream/queue were
|
|
// selected. It is an error to call this if q's head isn't a
|
|
// *writeData.
|
|
func (ws *http2writeScheduler) streamWritableBytes(q *http2writeQueue) int32 {
|
|
wm := q.head()
|
|
ret := wm.stream.flow.available()
|
|
if ret == 0 {
|
|
return 0
|
|
}
|
|
if int32(ws.maxFrameSize) < ret {
|
|
ret = int32(ws.maxFrameSize)
|
|
}
|
|
if ret == 0 {
|
|
panic("internal error: ws.maxFrameSize not initialized or invalid")
|
|
}
|
|
wd := wm.write.(*http2writeData)
|
|
if len(wd.p) < int(ret) {
|
|
ret = int32(len(wd.p))
|
|
}
|
|
return ret
|
|
}
|
|
|
|
func (ws *http2writeScheduler) takeFrom(id uint32, q *http2writeQueue) (wm http2frameWriteMsg, ok bool) {
|
|
wm = q.head()
|
|
|
|
if wd, ok := wm.write.(*http2writeData); ok && len(wd.p) > 0 {
|
|
allowed := wm.stream.flow.available()
|
|
if allowed == 0 {
|
|
|
|
return http2frameWriteMsg{}, false
|
|
}
|
|
if int32(ws.maxFrameSize) < allowed {
|
|
allowed = int32(ws.maxFrameSize)
|
|
}
|
|
|
|
if len(wd.p) > int(allowed) {
|
|
wm.stream.flow.take(allowed)
|
|
chunk := wd.p[:allowed]
|
|
wd.p = wd.p[allowed:]
|
|
|
|
return http2frameWriteMsg{
|
|
stream: wm.stream,
|
|
write: &http2writeData{
|
|
streamID: wd.streamID,
|
|
p: chunk,
|
|
|
|
endStream: false,
|
|
},
|
|
|
|
done: nil,
|
|
}, true
|
|
}
|
|
wm.stream.flow.take(int32(len(wd.p)))
|
|
}
|
|
|
|
q.shift()
|
|
if q.empty() {
|
|
ws.putEmptyQueue(q)
|
|
delete(ws.sq, id)
|
|
}
|
|
return wm, true
|
|
}
|
|
|
|
func (ws *http2writeScheduler) forgetStream(id uint32) {
|
|
q, ok := ws.sq[id]
|
|
if !ok {
|
|
return
|
|
}
|
|
delete(ws.sq, id)
|
|
|
|
for i := range q.s {
|
|
q.s[i] = http2frameWriteMsg{}
|
|
}
|
|
q.s = q.s[:0]
|
|
ws.putEmptyQueue(q)
|
|
}
|
|
|
|
type http2writeQueue struct {
|
|
s []http2frameWriteMsg
|
|
}
|
|
|
|
// streamID returns the stream ID for a non-empty stream-specific queue.
|
|
func (q *http2writeQueue) streamID() uint32 { return q.s[0].stream.id }
|
|
|
|
func (q *http2writeQueue) empty() bool { return len(q.s) == 0 }
|
|
|
|
func (q *http2writeQueue) push(wm http2frameWriteMsg) {
|
|
q.s = append(q.s, wm)
|
|
}
|
|
|
|
// head returns the next item that would be removed by shift.
|
|
func (q *http2writeQueue) head() http2frameWriteMsg {
|
|
if len(q.s) == 0 {
|
|
panic("invalid use of queue")
|
|
}
|
|
return q.s[0]
|
|
}
|
|
|
|
func (q *http2writeQueue) shift() http2frameWriteMsg {
|
|
if len(q.s) == 0 {
|
|
panic("invalid use of queue")
|
|
}
|
|
wm := q.s[0]
|
|
|
|
copy(q.s, q.s[1:])
|
|
q.s[len(q.s)-1] = http2frameWriteMsg{}
|
|
q.s = q.s[:len(q.s)-1]
|
|
return wm
|
|
}
|
|
|
|
func (q *http2writeQueue) firstIsNoCost() bool {
|
|
if df, ok := q.s[0].write.(*http2writeData); ok {
|
|
return len(df.p) == 0
|
|
}
|
|
return true
|
|
}
|