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55 lines
1.3 KiB
Go
55 lines
1.3 KiB
Go
// Copyright 2009 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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package iotest
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import (
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"io"
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"log"
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)
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type writeLogger struct {
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prefix string
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w io.Writer
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}
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func (l *writeLogger) Write(p []byte) (n int, err error) {
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n, err = l.w.Write(p)
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if err != nil {
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log.Printf("%s %x: %v", l.prefix, p[0:n], err)
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} else {
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log.Printf("%s %x", l.prefix, p[0:n])
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}
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return
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}
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// NewWriteLogger returns a writer that behaves like w except
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// that it logs (using log.Printf) each write to standard error,
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// printing the prefix and the hexadecimal data written.
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func NewWriteLogger(prefix string, w io.Writer) io.Writer {
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return &writeLogger{prefix, w}
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}
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type readLogger struct {
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prefix string
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r io.Reader
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}
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func (l *readLogger) Read(p []byte) (n int, err error) {
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n, err = l.r.Read(p)
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if err != nil {
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log.Printf("%s %x: %v", l.prefix, p[0:n], err)
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} else {
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log.Printf("%s %x", l.prefix, p[0:n])
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}
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return
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}
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// NewReadLogger returns a reader that behaves like r except
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// that it logs (using log.Print) each read to standard error,
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// printing the prefix and the hexadecimal data written.
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func NewReadLogger(prefix string, r io.Reader) io.Reader {
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return &readLogger{prefix, r}
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}
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