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log.go
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log.go
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// Copyright 2017 PingCAP, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.
package logutil
import (
"bytes"
"fmt"
"os"
"path"
"runtime"
"runtime/debug"
"strings"
"sync"
"github.com/coreos/pkg/capnslog"
"github.com/juju/errors"
log "github.com/sirupsen/logrus"
lumberjack "gopkg.in/natefinch/lumberjack.v2"
)
const (
defaultLogTimeFormat = "2006/01/02 15:04:05.000"
defaultLogMaxSize = 300 // MB
defaultLogFormat = "text"
defaultLogLevel = log.InfoLevel
)
// FileLogConfig serializes file log related config in toml/json.
type FileLogConfig struct {
// Log filename, leave empty to disable file log.
Filename string `toml:"filename" json:"filename"`
// Is log rotate enabled. TODO.
LogRotate bool `toml:"log-rotate" json:"log-rotate"`
// Max size for a single file, in MB.
MaxSize int `toml:"max-size" json:"max-size"`
// Max log keep days, default is never deleting.
MaxDays int `toml:"max-days" json:"max-days"`
// Maximum number of old log files to retain.
MaxBackups int `toml:"max-backups" json:"max-backups"`
}
// LogConfig serializes log related config in toml/json.
type LogConfig struct {
// Log level.
Level string `toml:"level" json:"level"`
// Log format. one of json, text, or console.
Format string `toml:"format" json:"format"`
// Disable automatic timestamps in output.
DisableTimestamp bool `toml:"disable-timestamp" json:"disable-timestamp"`
// File log config.
File FileLogConfig `toml:"file" json:"file"`
}
// redirectFormatter will redirect etcd logs to logrus logs.
type redirectFormatter struct{}
// Format implements capnslog.Formatter hook.
func (rf *redirectFormatter) Format(pkg string, level capnslog.LogLevel, depth int, entries ...interface{}) {
if pkg != "" {
pkg = fmt.Sprint(pkg, ": ")
}
logStr := fmt.Sprint(pkg, entries)
switch level {
case capnslog.CRITICAL:
log.Fatalf(logStr)
case capnslog.ERROR:
log.Errorf(logStr)
case capnslog.WARNING:
log.Warningf(logStr)
case capnslog.NOTICE:
log.Infof(logStr)
case capnslog.INFO:
log.Infof(logStr)
case capnslog.DEBUG, capnslog.TRACE:
log.Debugf(logStr)
}
}
// Flush only for implementing Formatter.
func (rf *redirectFormatter) Flush() {}
// isSKippedPackageName tests wether path name is on log library calling stack.
func isSkippedPackageName(name string) bool {
return strings.Contains(name, "github.com/sirupsen/logrus") ||
strings.Contains(name, "github.com/coreos/pkg/capnslog")
}
// modifyHook injects file name and line pos into log entry.
type contextHook struct{}
// Fire implements logrus.Hook interface
// https://github.com/sirupsen/logrus/issues/63
func (hook *contextHook) Fire(entry *log.Entry) error {
pc := make([]uintptr, 4)
cnt := runtime.Callers(6, pc)
for i := 0; i < cnt; i++ {
fu := runtime.FuncForPC(pc[i] - 1)
name := fu.Name()
if !isSkippedPackageName(name) {
file, line := fu.FileLine(pc[i] - 1)
entry.Data["file"] = path.Base(file)
entry.Data["line"] = line
break
}
}
return nil
}
// Levels implements logrus.Hook interface.
func (hook *contextHook) Levels() []log.Level {
return log.AllLevels
}
// StringToLogLevel translates log level string to log level.
func StringToLogLevel(level string) log.Level {
switch strings.ToLower(level) {
case "fatal":
return log.FatalLevel
case "error":
return log.ErrorLevel
case "warn", "warning":
return log.WarnLevel
case "debug":
return log.DebugLevel
case "info":
return log.InfoLevel
}
return defaultLogLevel
}
// textFormatter is for compatibility with ngaut/log
type textFormatter struct {
DisableTimestamp bool
}
// Format implements logrus.Formatter
func (f *textFormatter) Format(entry *log.Entry) ([]byte, error) {
var b *bytes.Buffer
if entry.Buffer != nil {
b = entry.Buffer
} else {
b = &bytes.Buffer{}
}
if !f.DisableTimestamp {
fmt.Fprintf(b, "%s ", entry.Time.Format(defaultLogTimeFormat))
}
if file, ok := entry.Data["file"]; ok {
fmt.Fprintf(b, "%s:%v:", file, entry.Data["line"])
}
fmt.Fprintf(b, " [%s] %s", entry.Level.String(), entry.Message)
for k, v := range entry.Data {
if k != "file" && k != "line" {
fmt.Fprintf(b, " %v=%v", k, v)
}
}
b.WriteByte('\n')
return b.Bytes(), nil
}
func stringToLogFormatter(format string, disableTimestamp bool) log.Formatter {
switch strings.ToLower(format) {
case "text":
return &textFormatter{
DisableTimestamp: disableTimestamp,
}
case "json":
return &log.JSONFormatter{
TimestampFormat: defaultLogTimeFormat,
DisableTimestamp: disableTimestamp,
}
case "console":
return &log.TextFormatter{
FullTimestamp: true,
TimestampFormat: defaultLogTimeFormat,
DisableTimestamp: disableTimestamp,
}
default:
return &textFormatter{}
}
}
// InitFileLog initializes file based logging options.
func InitFileLog(cfg *FileLogConfig) error {
if st, err := os.Stat(cfg.Filename); err == nil {
if st.IsDir() {
return errors.New("can't use directory as log file name")
}
}
if cfg.MaxSize == 0 {
cfg.MaxSize = defaultLogMaxSize
}
// use lumberjack to logrotate
output := &lumberjack.Logger{
Filename: cfg.Filename,
MaxSize: cfg.MaxSize,
MaxBackups: cfg.MaxBackups,
MaxAge: cfg.MaxDays,
LocalTime: true,
}
log.SetOutput(output)
return nil
}
var once sync.Once
// InitLogger initializes PD's logger.
func InitLogger(cfg *LogConfig) error {
var err error
once.Do(func() {
log.SetLevel(StringToLogLevel(cfg.Level))
log.AddHook(&contextHook{})
if cfg.Format == "" {
cfg.Format = defaultLogFormat
}
log.SetFormatter(stringToLogFormatter(cfg.Format, cfg.DisableTimestamp))
// etcd log
capnslog.SetFormatter(&redirectFormatter{})
if len(cfg.File.Filename) == 0 {
return
}
err = InitFileLog(&cfg.File)
})
if err != nil {
return errors.Trace(err)
}
return nil
}
// LogPanic logs the panic reason and stack, then exit the process.
// Commonly used with a `defer`.
func LogPanic() {
if e := recover(); e != nil {
log.Fatalf("panic: %v, stack: %s", e, string(debug.Stack()))
}
}