func (l *JSONFileLogger) readLogs(logWatcher *logger.LogWatcher, config logger.ReadConfig) {
defer close(logWatcher.Msg)
pth := l.writer.LogPath()
var files []io.ReadSeeker
for i := l.writer.MaxFiles(); i > 1; i-- {
f, err := os.Open(fmt.Sprintf("%s.%d", pth, i-1))
if err != nil {
if !os.IsNotExist(err) {
logWatcher.Err <- err
break
}
continue
}
files = append(files, f)
}
latestFile, err := os.Open(pth)
if err != nil {
logWatcher.Err <- err
return
}
if config.Tail != 0 {
tailer := ioutils.MultiReadSeeker(append(files, latestFile)...)
tailFile(tailer, logWatcher, config.Tail, config.Since)
}
// close all the rotated files
for _, f := range files {
if err := f.(io.Closer).Close(); err != nil {
logrus.WithField("logger", "json-file").Warnf("error closing tailed log file: %v", err)
}
}
if !config.Follow {
if err := latestFile.Close(); err != nil {
logrus.Errorf("Error closing file: %v", err)
}
return
}
if config.Tail >= 0 {
latestFile.Seek(0, os.SEEK_END)
}
l.mu.Lock()
l.readers[logWatcher] = struct{}{}
l.mu.Unlock()
notifyRotate := l.writer.NotifyRotate()
followLogs(latestFile, logWatcher, notifyRotate, config.Since)
l.mu.Lock()
delete(l.readers, logWatcher)
l.mu.Unlock()
l.writer.NotifyRotateEvict(notifyRotate)
}
func (l *JSONFileLogger) readLogs(logWatcher *logger.LogWatcher, config logger.ReadConfig) {
defer close(logWatcher.Msg)
pth := l.ctx.LogPath
var files []io.ReadSeeker
for i := l.n; i > 1; i-- {
f, err := os.Open(fmt.Sprintf("%s.%d", pth, i-1))
if err != nil {
if !os.IsNotExist(err) {
logWatcher.Err <- err
break
}
continue
}
defer f.Close()
files = append(files, f)
}
latestFile, err := os.Open(pth)
if err != nil {
logWatcher.Err <- err
return
}
defer latestFile.Close()
files = append(files, latestFile)
tailer := ioutils.MultiReadSeeker(files...)
if config.Tail != 0 {
tailFile(tailer, logWatcher, config.Tail, config.Since)
}
if !config.Follow {
return
}
if config.Tail >= 0 {
latestFile.Seek(0, os.SEEK_END)
}
l.mu.Lock()
l.readers[logWatcher] = struct{}{}
l.mu.Unlock()
notifyRotate := l.notifyRotate.Subscribe()
followLogs(latestFile, logWatcher, notifyRotate, config.Since)
l.mu.Lock()
delete(l.readers, logWatcher)
l.mu.Unlock()
l.notifyRotate.Evict(notifyRotate)
}