2019-06-02 15:48:37 +00:00
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// Copyright 2018 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Fake networking for js/wasm. It is intended to allow tests of other package to pass.
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2022-10-27 18:55:19 +00:00
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//go:build js && wasm
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2019-06-02 15:48:37 +00:00
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package net
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import (
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"context"
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"internal/poll"
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"io"
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"os"
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"sync"
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"syscall"
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"time"
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)
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var listenersMu sync.Mutex
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var listeners = make(map[string]*netFD)
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var portCounterMu sync.Mutex
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var portCounter = 0
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func nextPort() int {
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portCounterMu.Lock()
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defer portCounterMu.Unlock()
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portCounter++
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return portCounter
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}
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// Network file descriptor.
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type netFD struct {
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r *bufferedPipe
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w *bufferedPipe
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incoming chan *netFD
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closedMu sync.Mutex
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closed bool
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// immutable until Close
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listener bool
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family int
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sotype int
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net string
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laddr Addr
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raddr Addr
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// unused
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pfd poll.FD
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isConnected bool // handshake completed or use of association with peer
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}
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// socket returns a network file descriptor that is ready for
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// asynchronous I/O using the network poller.
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func socket(ctx context.Context, net string, family, sotype, proto int, ipv6only bool, laddr, raddr sockaddr, ctrlFn func(string, string, syscall.RawConn) error) (*netFD, error) {
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fd := &netFD{family: family, sotype: sotype, net: net}
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if laddr != nil && raddr == nil { // listener
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l := laddr.(*TCPAddr)
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fd.laddr = &TCPAddr{
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IP: l.IP,
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Port: nextPort(),
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Zone: l.Zone,
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}
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fd.listener = true
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fd.incoming = make(chan *netFD, 1024)
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listenersMu.Lock()
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listeners[fd.laddr.(*TCPAddr).String()] = fd
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listenersMu.Unlock()
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return fd, nil
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}
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fd.laddr = &TCPAddr{
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IP: IPv4(127, 0, 0, 1),
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Port: nextPort(),
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}
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fd.raddr = raddr
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fd.r = newBufferedPipe(65536)
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fd.w = newBufferedPipe(65536)
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fd2 := &netFD{family: fd.family, sotype: sotype, net: net}
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fd2.laddr = fd.raddr
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fd2.raddr = fd.laddr
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fd2.r = fd.w
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fd2.w = fd.r
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listenersMu.Lock()
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l, ok := listeners[fd.raddr.(*TCPAddr).String()]
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if !ok {
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listenersMu.Unlock()
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return nil, syscall.ECONNREFUSED
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}
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l.incoming <- fd2
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listenersMu.Unlock()
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return fd, nil
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}
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func (fd *netFD) Read(p []byte) (n int, err error) {
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return fd.r.Read(p)
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}
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func (fd *netFD) Write(p []byte) (nn int, err error) {
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return fd.w.Write(p)
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}
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func (fd *netFD) Close() error {
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fd.closedMu.Lock()
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if fd.closed {
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fd.closedMu.Unlock()
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return nil
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}
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fd.closed = true
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fd.closedMu.Unlock()
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if fd.listener {
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listenersMu.Lock()
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delete(listeners, fd.laddr.String())
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close(fd.incoming)
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fd.listener = false
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listenersMu.Unlock()
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return nil
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}
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fd.r.Close()
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fd.w.Close()
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return nil
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}
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func (fd *netFD) closeRead() error {
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fd.r.Close()
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return nil
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}
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func (fd *netFD) closeWrite() error {
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fd.w.Close()
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return nil
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}
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func (fd *netFD) accept() (*netFD, error) {
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c, ok := <-fd.incoming
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if !ok {
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return nil, syscall.EINVAL
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}
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return c, nil
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}
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func (fd *netFD) SetDeadline(t time.Time) error {
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fd.r.SetReadDeadline(t)
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fd.w.SetWriteDeadline(t)
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return nil
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}
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func (fd *netFD) SetReadDeadline(t time.Time) error {
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fd.r.SetReadDeadline(t)
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return nil
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}
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func (fd *netFD) SetWriteDeadline(t time.Time) error {
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fd.w.SetWriteDeadline(t)
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return nil
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}
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func newBufferedPipe(softLimit int) *bufferedPipe {
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p := &bufferedPipe{softLimit: softLimit}
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p.rCond.L = &p.mu
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p.wCond.L = &p.mu
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return p
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}
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type bufferedPipe struct {
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softLimit int
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mu sync.Mutex
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buf []byte
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closed bool
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rCond sync.Cond
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wCond sync.Cond
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rDeadline time.Time
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wDeadline time.Time
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}
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func (p *bufferedPipe) Read(b []byte) (int, error) {
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p.mu.Lock()
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defer p.mu.Unlock()
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for {
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if p.closed && len(p.buf) == 0 {
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return 0, io.EOF
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}
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if !p.rDeadline.IsZero() {
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d := time.Until(p.rDeadline)
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if d <= 0 {
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return 0, syscall.EAGAIN
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}
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time.AfterFunc(d, p.rCond.Broadcast)
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}
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if len(p.buf) > 0 {
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break
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}
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p.rCond.Wait()
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}
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n := copy(b, p.buf)
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p.buf = p.buf[n:]
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p.wCond.Broadcast()
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return n, nil
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}
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func (p *bufferedPipe) Write(b []byte) (int, error) {
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p.mu.Lock()
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defer p.mu.Unlock()
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for {
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if p.closed {
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return 0, syscall.ENOTCONN
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}
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if !p.wDeadline.IsZero() {
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d := time.Until(p.wDeadline)
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if d <= 0 {
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return 0, syscall.EAGAIN
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}
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time.AfterFunc(d, p.wCond.Broadcast)
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}
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if len(p.buf) <= p.softLimit {
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break
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}
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p.wCond.Wait()
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}
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p.buf = append(p.buf, b...)
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p.rCond.Broadcast()
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return len(b), nil
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}
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func (p *bufferedPipe) Close() {
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p.mu.Lock()
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defer p.mu.Unlock()
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p.closed = true
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p.rCond.Broadcast()
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p.wCond.Broadcast()
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}
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func (p *bufferedPipe) SetReadDeadline(t time.Time) {
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p.mu.Lock()
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defer p.mu.Unlock()
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p.rDeadline = t
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p.rCond.Broadcast()
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}
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func (p *bufferedPipe) SetWriteDeadline(t time.Time) {
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p.mu.Lock()
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defer p.mu.Unlock()
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p.wDeadline = t
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p.wCond.Broadcast()
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}
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func sysSocket(family, sotype, proto int) (int, error) {
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return 0, syscall.ENOSYS
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}
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func (fd *netFD) readFrom(p []byte) (n int, sa syscall.Sockaddr, err error) {
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return 0, nil, syscall.ENOSYS
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2022-10-27 18:55:19 +00:00
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}
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func (fd *netFD) readFromInet4(p []byte, sa *syscall.SockaddrInet4) (n int, err error) {
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return 0, syscall.ENOSYS
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}
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func (fd *netFD) readFromInet6(p []byte, sa *syscall.SockaddrInet6) (n int, err error) {
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return 0, syscall.ENOSYS
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2019-06-02 15:48:37 +00:00
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}
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2022-10-27 18:55:19 +00:00
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func (fd *netFD) readMsg(p []byte, oob []byte, flags int) (n, oobn, retflags int, sa syscall.Sockaddr, err error) {
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2019-06-02 15:48:37 +00:00
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return 0, 0, 0, nil, syscall.ENOSYS
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}
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2022-10-27 18:55:19 +00:00
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func (fd *netFD) readMsgInet4(p []byte, oob []byte, flags int, sa *syscall.SockaddrInet4) (n, oobn, retflags int, err error) {
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return 0, 0, 0, syscall.ENOSYS
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}
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func (fd *netFD) readMsgInet6(p []byte, oob []byte, flags int, sa *syscall.SockaddrInet6) (n, oobn, retflags int, err error) {
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return 0, 0, 0, syscall.ENOSYS
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}
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func (fd *netFD) writeMsgInet4(p []byte, oob []byte, sa *syscall.SockaddrInet4) (n int, oobn int, err error) {
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return 0, 0, syscall.ENOSYS
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}
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func (fd *netFD) writeMsgInet6(p []byte, oob []byte, sa *syscall.SockaddrInet6) (n int, oobn int, err error) {
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return 0, 0, syscall.ENOSYS
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}
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2019-06-02 15:48:37 +00:00
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func (fd *netFD) writeTo(p []byte, sa syscall.Sockaddr) (n int, err error) {
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return 0, syscall.ENOSYS
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}
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2022-10-27 18:55:19 +00:00
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func (fd *netFD) writeToInet4(p []byte, sa *syscall.SockaddrInet4) (n int, err error) {
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return 0, syscall.ENOSYS
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}
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func (fd *netFD) writeToInet6(p []byte, sa *syscall.SockaddrInet6) (n int, err error) {
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return 0, syscall.ENOSYS
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}
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2019-06-02 15:48:37 +00:00
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func (fd *netFD) writeMsg(p []byte, oob []byte, sa syscall.Sockaddr) (n int, oobn int, err error) {
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return 0, 0, syscall.ENOSYS
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}
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func (fd *netFD) dup() (f *os.File, err error) {
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return nil, syscall.ENOSYS
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}
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