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log.go
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log.go
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package frontman
import (
"bytes"
"encoding/json"
"fmt"
"io/ioutil"
"os"
"path/filepath"
"time"
"github.com/cloudradar-monitoring/frontman/pkg/stats"
"github.com/sirupsen/logrus"
)
type LogLevel string
const (
LogLevelDebug LogLevel = "debug"
LogLevelInfo LogLevel = "info"
LogLevelError LogLevel = "error"
)
func (lvl LogLevel) LogrusLevel() logrus.Level {
switch lvl {
case LogLevelDebug:
return logrus.DebugLevel
case LogLevelError:
return logrus.ErrorLevel
default:
return logrus.InfoLevel
}
}
type logrusFileHook struct {
file *os.File
flag int
chmod os.FileMode
formatter *logrus.TextFormatter
}
func addLogFileHook(file string, flag int, chmod os.FileMode) error {
dir := filepath.Dir(file)
err := os.MkdirAll(dir, 0755)
if err != nil {
logrus.WithError(err).Errorf("Failed to create the logs dir: '%s'", dir)
}
plainFormatter := &logrus.TextFormatter{FullTimestamp: true, DisableColors: true}
logFile, err := os.OpenFile(file, flag, chmod)
if err != nil {
return fmt.Errorf("unable to write log file: %s", err.Error())
}
hook := &logrusFileHook{logFile, flag, chmod, plainFormatter}
logrus.AddHook(hook)
return nil
}
func (fm *Frontman) addErrorHook() {
hook := &LogrusErrorHook{
fm: fm,
}
logrus.AddHook(hook)
}
// Fire event
func (hook *logrusFileHook) Fire(entry *logrus.Entry) error {
plainformat, err := hook.formatter.Format(entry)
if err != nil {
return err
}
line := string(plainformat)
_, err = hook.file.WriteString(line)
if err != nil {
fmt.Fprintf(os.Stderr, "unable to write file on filehook(entry.String)%v", err)
return err
}
return nil
}
func (hook *logrusFileHook) Levels() []logrus.Level {
return []logrus.Level{
logrus.PanicLevel,
logrus.FatalLevel,
logrus.ErrorLevel,
logrus.WarnLevel,
logrus.InfoLevel,
logrus.DebugLevel,
}
}
// startWritingStats writes fm.Stats every minute to Config.StatsFile
// This method should only be called once
func (fm *Frontman) startWritingStats() {
// Only start writing out stats if there is a StatsFile configued
if fm.Config.StatsFile == "" {
return
}
fm.stats.StartedAt = time.Now()
logrus.Debugf("Start writing stats file: %s", fm.Config.StatsFile)
var buff bytes.Buffer
var err error
// Make the output indented
encoder := json.NewEncoder(&buff)
encoder.SetIndent("", " ")
for {
buff.Reset()
time.Sleep(time.Second * 30)
stats := fm.statsSnapshot()
stats.Uptime = uint64(time.Since(stats.StartedAt).Seconds())
err = encoder.Encode(stats)
if err != nil {
logrus.Errorf("Could not encode stats file: %s", err)
continue
}
err = ioutil.WriteFile(fm.Config.StatsFile, buff.Bytes(), 0755)
if err != nil {
logrus.Errorf("Could not write stats file: %s", err)
return
}
}
}
// Get snapshot from current stats
func (fm *Frontman) statsSnapshot() stats.FrontmanStats {
fm.statsLock.Lock()
defer fm.statsLock.Unlock()
return *fm.stats
}
// SetLogLevel sets Log level and corresponding logrus level
func (fm *Frontman) SetLogLevel(lvl LogLevel) {
fm.Config.LogLevel = lvl
logrus.SetLevel(lvl.LogrusLevel())
}
type LogrusErrorHook struct {
fm *Frontman
}
func (h *LogrusErrorHook) Fire(entry *logrus.Entry) error {
h.fm.statsLock.Lock()
h.fm.stats.InternalErrorsTotal++
h.fm.stats.InternalLastErrorMessage = entry.Message
h.fm.stats.InternalLastErrorTimestamp = uint64(time.Now().Unix())
h.fm.statsLock.Unlock()
return nil
}
func (h *LogrusErrorHook) Levels() []logrus.Level {
return []logrus.Level{
logrus.ErrorLevel,
}
}
func (fm *Frontman) configureLogger() {
tfmt := logrus.TextFormatter{FullTimestamp: true, DisableColors: true}
logrus.SetFormatter(&tfmt)
fm.SetLogLevel(fm.Config.LogLevel)
if fm.Config.LogFile != "" {
err := addLogFileHook(fm.Config.LogFile, os.O_WRONLY|os.O_APPEND|os.O_CREATE, 0644)
if err != nil {
logrus.Error("Can't write logs to file: ", err.Error())
}
}
if fm.Config.LogSyslog != "" {
err := addSyslogHook(fm.Config.LogSyslog)
if err != nil {
logrus.Error("Can't set up syslog: ", err.Error())
}
}
if fm.Config.Node.ForwardLog != "" {
var err error
fm.forwardLog, err = os.OpenFile(fm.Config.Node.ForwardLog, os.O_WRONLY|os.O_CREATE|os.O_APPEND, 0666)
if err != nil {
logrus.Error("Can't set up forward_log: ", err.Error())
}
}
// Add hook to logrus that updates our LastInternalError statistics
// whenever an error log is done
fm.addErrorHook()
// sets standard logging to /dev/null
devNull, err := os.OpenFile(os.DevNull, os.O_APPEND|os.O_WRONLY, os.ModeAppend)
if err != nil {
logrus.Error("err", err)
}
logrus.SetOutput(devNull)
}