// timestamped adds a timestamp to the beginning of log lines
func timestamped(orig io.Writer) io.Writer {
return wfilter.SimplePrepender(orig, func(w io.Writer) (int, error) {
ts := time.Now()
runningSecs := ts.Sub(processStart).Seconds()
secs := int(math.Mod(runningSecs, 60))
mins := int(runningSecs / 60)
return fmt.Fprintf(w, "%s - %dm%ds ", ts.In(time.UTC).Format(logTimestampFormat), mins, secs)
})
}
func Init() error {
logdir := appdir.Logs("Lantern")
log.Debugf("Placing logs in %v", logdir)
if _, err := os.Stat(logdir); err != nil {
if os.IsNotExist(err) {
// Create log dir
if err := os.MkdirAll(logdir, 0755); err != nil {
return fmt.Errorf("Unable to create logdir at %s: %s", logdir, err)
}
}
}
logFile = rotator.NewSizeRotator(filepath.Join(logdir, "lantern.log"))
// Set log files to 4 MB
logFile.RotationSize = 4 * 1024 * 1024
// Keep up to 5 log files
logFile.MaxRotation = 5
// Loggly has its own timestamp so don't bother adding it in message,
// moreover, golog always write each line in whole, so we need not to care about line breaks.
// timestamped adds a timestamp to the beginning of log lines
timestamped := func(orig io.Writer) io.Writer {
return wfilter.SimplePrepender(orig, func(w io.Writer) (int, error) {
ts := time.Now()
runningSecs := ts.Sub(processStart).Seconds()
secs := int(math.Mod(runningSecs, 60))
mins := int(runningSecs / 60)
return fmt.Fprintf(w, "%s - %dm%ds ", ts.In(time.UTC).Format(logTimestampFormat), mins, secs)
})
}
errorOut = timestamped(NonStopWriter(os.Stderr, logFile))
debugOut = timestamped(NonStopWriter(os.Stdout, logFile))
golog.SetOutputs(errorOut, debugOut)
return nil
}