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logging.go
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logging.go
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// Copyright 2017-2021 Digital Asset Exchange Limited. All rights reserved.
// Use of this source code is governed by BSD-3-Clause "New" or "Revised"
// License (BSD-3-Clause) that can be found in the LICENSE file.
package main
import (
"fmt"
"io"
"os"
"path/filepath"
"sync"
"time"
log "github.com/sirupsen/logrus"
)
var logger = &rotatingLogger{
fileMux: new(sync.RWMutex),
}
type rotatingLogger struct {
prefix string
file *os.File
fileMux *sync.RWMutex
formatter *log.JSONFormatter
masterTimer *time.Timer
}
func newRotatingLogger(prefix string) (*rotatingLogger, error) {
fPath := filepath.Join(prefix, time.Now().Format("2006-01-02")+".log")
f, err := os.OpenFile(fPath, os.O_WRONLY|os.O_APPEND|os.O_CREATE, 0644)
if err != nil {
return nil, err
}
l := &rotatingLogger{
prefix: prefix,
file: f,
fileMux: new(sync.RWMutex),
formatter: new(log.JSONFormatter),
}
l.masterTimer = time.AfterFunc(untilMidnight(), func() {
l.rotate(time.Now())
l.masterTimer.Reset(untilMidnight())
})
return l, nil
}
func untilMidnight() time.Duration {
ts := time.Now()
midnight := time.Date(ts.Year(), ts.Month(), ts.Day(), 0, 0, 0, 0, ts.Location()).AddDate(0, 0, 1)
return midnight.Sub(ts)
}
func (l *rotatingLogger) rotate(now time.Time) {
l.fileMux.Lock()
defer l.fileMux.Unlock()
if l.file == nil {
// closed already
return
}
fPath := filepath.Join(l.prefix, now.Format("2006-01-02")+".log")
if f, err := os.Create(fPath); err == nil {
if err := l.file.Close(); err != nil {
log.Warningf("failed to close previous log file: %v", err)
}
l.file = f
} else {
log.Warningf("failed to open new log file: %v", err)
}
}
func (l *rotatingLogger) Levels() []log.Level {
return []log.Level{
log.WarnLevel,
log.ErrorLevel,
log.FatalLevel,
log.PanicLevel,
}
}
func (l *rotatingLogger) Fire(entry *log.Entry) error {
l.fileMux.Lock()
defer l.fileMux.Unlock()
if l.file == nil {
// closed already
return nil
}
line, err := l.formatter.Format(entry)
if err != nil {
return err
}
_, err = fmt.Fprint(l.file, string(line))
return err
}
func (r *rotatingLogger) Write(p []byte) (n int, err error) {
r.fileMux.Lock()
defer r.fileMux.Unlock()
if r.file == nil {
return 0, io.EOF
}
return r.file.Write(p)
}
func (l *rotatingLogger) Close() error {
l.fileMux.Lock()
defer l.fileMux.Unlock()
if l.file == nil {
// closed already
return nil
}
err := l.file.Close()
l.file = nil
return err
}