1 // Copyright 2009 The Go Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style
3 // license that can be found in the LICENSE file.
12 type writeLogger struct {
17 func (l *writeLogger) Write(p []byte) (n int, err error) {
20 log.Printf("%s %x: %v", l.prefix, p[0:n], err)
22 log.Printf("%s %x", l.prefix, p[0:n])
27 // NewWriteLogger returns a writer that behaves like w except
28 // that it logs (using log.Printf) each write to standard error,
29 // printing the prefix and the hexadecimal data written.
30 func NewWriteLogger(prefix string, w io.Writer) io.Writer {
31 return &writeLogger{prefix, w}
34 type readLogger struct {
39 func (l *readLogger) Read(p []byte) (n int, err error) {
42 log.Printf("%s %x: %v", l.prefix, p[0:n], err)
44 log.Printf("%s %x", l.prefix, p[0:n])
49 // NewReadLogger returns a reader that behaves like r except
50 // that it logs (using log.Printf) each read to standard error,
51 // printing the prefix and the hexadecimal data read.
52 func NewReadLogger(prefix string, r io.Reader) io.Reader {
53 return &readLogger{prefix, r}