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multi.go
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multi.go
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package log
import (
"bytes"
"io"
)
// LeveledWriter is an interface that wraps WriteAtLevel.
type LeveledWriter interface {
// WriteAtLevel decides which writers to use by checking the specified Level.
WriteAtLevel(Level, []byte) (int, error)
}
// MultiWriter is an io.WriteCloser that log to different writers by different levels
type MultiWriter struct {
// InfoWriter specifies the level large than info logs writes to
InfoWriter io.Writer
// WarnWriter specifies the level large than warn logs writes to
WarnWriter io.Writer
// WarnWriter specifies the level large than error logs writes to
ErrorWriter io.Writer
// StderrWriter specifies the stderr writer
StderrWriter io.Writer
// StderrLevel specifies the minimal level logs it will be writes to stderr
StderrLevel Level
}
// Close implements io.Closer, and closes the underlying LeveledWriter.
func (w *MultiWriter) Close() (err error) {
for _, writer := range []io.Writer{
w.InfoWriter,
w.WarnWriter,
w.ErrorWriter,
w.StderrWriter,
} {
if writer == nil {
continue
}
Flush(writer)
if closer, ok := writer.(io.Closer); ok {
if err1 := closer.Close(); err1 != nil {
err = err1
}
}
}
return
}
// WriteAtLevel implements LeveledWriter.
func (w *MultiWriter) WriteAtLevel(level Level, p []byte) (n int, err error) {
var err1 error
switch level {
case noLevel, PanicLevel, FatalLevel, ErrorLevel:
if w.ErrorWriter != nil {
n, err1 = w.ErrorWriter.Write(p)
if err1 != nil && err == nil {
err = err1
}
}
fallthrough
case WarnLevel:
if w.WarnWriter != nil {
n, err1 = w.WarnWriter.Write(p)
if err1 != nil && err == nil {
err = err1
}
}
fallthrough
default:
if w.InfoWriter != nil {
n, err1 = w.InfoWriter.Write(p)
if err1 != nil && err == nil {
err = err1
}
}
}
if w.StderrWriter != nil && level >= w.StderrLevel {
w.StderrWriter.Write(p)
}
return
}
var levelBegin = []byte(`"level":"`)
// Write implements io.Writer.
func (w *MultiWriter) Write(p []byte) (n int, err error) {
var l byte
// guess level by fixed offset
lp := len(p)
if lp > 49 {
_ = p[49]
switch {
case p[32] == 'Z' && p[42] == ':' && p[43] == '"':
l = p[44]
case p[32] == '+' && p[47] == ':' && p[48] == '"':
l = p[49]
}
}
// guess level by "level":" beginning
if l == 0 {
if i := bytes.Index(p, levelBegin); i > 0 && i+len(levelBegin)+1 < lp {
l = p[i+len(levelBegin)]
}
}
// convert byte to Level
var level = noLevel
switch l {
case 't':
level = TraceLevel
case 'd':
level = DebugLevel
case 'i':
level = InfoLevel
case 'w':
level = WarnLevel
case 'e':
level = ErrorLevel
case 'f':
level = FatalLevel
case 'p':
level = PanicLevel
}
return w.WriteAtLevel(level, p)
}
// wrapLeveledWriter wraps a LeveledWriter to implement io.Writer.
type wrapLeveledWriter struct {
Level Level
LeveledWriter LeveledWriter
}
// Write implements io.Writer.
func (w wrapLeveledWriter) Write(p []byte) (int, error) {
return w.LeveledWriter.WriteAtLevel(w.Level, p)
}
var _ io.Writer = wrapLeveledWriter{}