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async.go
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async.go
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package logger
import (
"errors"
"io"
"log"
"os"
"time"
)
type asyncWriter struct {
w io.Writer
queue chan []byte
flushCh chan chan<- struct{}
}
func newAsyncWriter(w io.Writer) *asyncWriter {
aw := &asyncWriter{
w: w,
queue: make(chan []byte, 512),
flushCh: make(chan chan<- struct{}),
}
go aw.doWork()
return aw
}
func (w *asyncWriter) Flush() error {
ch := make(chan struct{})
w.flushCh <- ch
<-ch
return nil
}
func (w *asyncWriter) Write(p []byte) (int, error) {
b := make([]byte, len(p))
copy(b, p)
w.queue <- b
return len(p), nil
}
func (w *asyncWriter) doFlush() {
n := len(w.queue)
for i := 0; i < n; i++ {
select {
case p := <-w.queue:
w.w.Write(p)
default:
}
}
}
func (w *asyncWriter) doWork() {
for {
select {
case c := <-w.flushCh:
w.doFlush()
close(c)
case p := <-w.queue:
w.w.Write(p)
}
}
}
type asyncLogger struct {
writer *asyncWriter
log *logger
}
func (l *asyncLogger) Flush() error {
l.writer.Flush()
return nil
}
func (l *asyncLogger) FlushTimeout(d time.Duration) error {
ch := make(chan error, 1)
go func() {
ch <- l.Flush()
}()
select {
case err := <-ch:
return err
case <-time.After(d):
return errors.New("logger: flush timed out after " + d.String())
}
}
func NewAsyncWriterLogger(level LogLevel, ioWriter io.Writer) Logger {
wout := newAsyncWriter(ioWriter)
return &asyncLogger{
writer: wout,
log: &logger{
level: level,
logger: log.New(wout, "", 0),
timestampFormat: legacyTimeFormat,
},
}
}
func (l *asyncLogger) Debug(tag, msg string, args ...interface{}) {
l.log.Debug(tag, msg, args...)
}
func (l *asyncLogger) DebugWithDetails(tag, msg string, args ...interface{}) {
l.log.DebugWithDetails(tag, msg, args...)
}
func (l *asyncLogger) Info(tag, msg string, args ...interface{}) {
l.log.Info(tag, msg, args...)
}
func (l *asyncLogger) Warn(tag, msg string, args ...interface{}) {
l.log.Warn(tag, msg, args...)
}
func (l *asyncLogger) Error(tag, msg string, args ...interface{}) {
l.log.Error(tag, msg, args...)
}
func (l *asyncLogger) ErrorWithDetails(tag, msg string, args ...interface{}) {
l.log.ErrorWithDetails(tag, msg, args...)
}
func (l *asyncLogger) HandlePanic(tag string) {
if l.log.recoverPanic(tag) {
l.FlushTimeout(time.Second * 30)
os.Exit(2)
}
}
func (l *asyncLogger) ToggleForcedDebug() {
l.log.ToggleForcedDebug()
}
func (l *asyncLogger) UseRFC3339Timestamps() {
l.log.UseRFC3339Timestamps()
}