blob: a00305298b821e98f57c69977f0ad5ab20c7cde1 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
|
package log
import (
"bytes"
"io"
"sync"
"github.com/go-logfmt/logfmt"
)
type logfmtEncoder struct {
*logfmt.Encoder
buf bytes.Buffer
}
func (l *logfmtEncoder) Reset() {
l.Encoder.Reset()
l.buf.Reset()
}
var logfmtEncoderPool = sync.Pool{
New: func() interface{} {
var enc logfmtEncoder
enc.Encoder = logfmt.NewEncoder(&enc.buf)
return &enc
},
}
type logfmtLogger struct {
w io.Writer
}
// NewLogfmtLogger returns a logger that encodes keyvals to the Writer in
// logfmt format. Each log event produces no more than one call to w.Write.
// The passed Writer must be safe for concurrent use by multiple goroutines if
// the returned Logger will be used concurrently.
func NewLogfmtLogger(w io.Writer) Logger {
return &logfmtLogger{w}
}
func (l logfmtLogger) Log(keyvals ...interface{}) error {
enc := logfmtEncoderPool.Get().(*logfmtEncoder)
enc.Reset()
defer logfmtEncoderPool.Put(enc)
if err := enc.EncodeKeyvals(keyvals...); err != nil {
return err
}
// Add newline to the end of the buffer
if err := enc.EndRecord(); err != nil {
return err
}
// The Logger interface requires implementations to be safe for concurrent
// use by multiple goroutines. For this implementation that means making
// only one call to l.w.Write() for each call to Log.
if _, err := l.w.Write(enc.buf.Bytes()); err != nil {
return err
}
return nil
}
|