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simple logging shim reader and writers

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R=r
DELTA=53  (52 added, 0 deleted, 1 changed)
OCL=29295
CL=29298
This commit is contained in:
Russ Cox 2009-05-22 22:40:08 -07:00
parent 99128fc7ab
commit da59dd41c2
2 changed files with 57 additions and 1 deletions
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3
src/lib/testing/iotest/Makefile
View File

@ -40,6 +40,7 @@ coverage: packages
$(AS) $*.s
O1=\
logger.$O\
reader.$O\
@ -47,7 +48,7 @@ phases: a1
_obj$D/iotest.a: phases
a1: $(O1)
$(AR) grc _obj$D/iotest.a reader.$O
$(AR) grc _obj$D/iotest.a logger.$O reader.$O
rm -f $(O1)

55
src/lib/testing/iotest/logger.go Normal file
View File

@ -0,0 +1,55 @@
// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package iotest
import (
"io";
"log";
"os";
)
type writeLogger struct {
prefix string;
w io.Writer;
}
func (l *writeLogger) Write(p []byte) (n int, err os.Error) {
n, err = l.w.Write(p);
if err != nil {
log.Stdoutf("%s %x: %v", l.prefix, p[0:n], err);
} else {
log.Stdoutf("%s %x", l.prefix, p[0:n]);
}
return;
}
// NewWriteLogger returns a writer that behaves like w except
// that it logs (using log.Stdout) each write to standard output,
// printing the prefix and the hexadecimal data written.
func NewWriteLogger(prefix string, w io.Writer) io.Writer {
return &writeLogger{prefix, w}
}
type readLogger struct {
prefix string;
r io.Reader;
}
func (l *readLogger) Read(p []byte) (n int, err os.Error) {
n, err = l.r.Read(p);
if err != nil {
log.Stdoutf("%s %x: %v", l.prefix, p[0:n], err);
} else {
log.Stdoutf("%s %x", l.prefix, p[0:n]);
}
return;
}
// NewReadLogger returns a writer that behaves like w except
// that it logs (using log.Stdout) each write to standard output,
// printing the prefix and the hexadecimal data written.
func NewReadLogger(prefix string, r io.Reader) io.Reader {
return &readLogger{prefix, r}
}