func (instance *Instance) readFromTail(t *tail.Tail, pub *zmqpubsub.Publisher, name string, stopCh chan bool, filename string, tracker storage.Tracker) {
var err error
FORLOOP:
for {
select {
case line, ok := <-t.Lines:
if !ok {
err = t.Wait()
break FORLOOP
}
currentOffset, err := t.Tell()
if err != nil {
log.Error(err.Error())
}
tracker.Update(instance.getShortDockerId(), filename, currentOffset)
instance.publishLine(pub, name, line)
case <-stopCh:
err = t.Stop()
break FORLOOP
}
}
if err != nil {
log.Warn(err)
instance.SendTimelineEvent("WARN -- Error tailing file (%s); %s", name, err)
}
log.Infof("Completed tailing %v log for %v", name, instance.Identifier())
}
func (s *FileStorage) Load(e interface{}) error {
var err error
if _, err = os.Stat(s.file_path); os.IsNotExist(err) {
log.Infof("Creating %s since it does not exist", s.file_path)
_, err = os.Create(s.file_path)
} else {
n, err := ioutil.ReadFile(s.file_path)
if err != nil {
log.Error(err)
}
p := bytes.NewBuffer(n)
dec := gob.NewDecoder(p)
err = dec.Decode(e)
if err != nil {
log.Error(err)
}
}
return err
}
func main() {
go common.RegisterTailCleanup()
major, minor, patch := gozmq.Version()
log.Infof("Starting systail (zeromq %d.%d.%d)", major, minor, patch)
systail.LoadConfig()
nodeid, err := server.LocalIP()
if err != nil {
common.Fatal("Failed to determine IP addr: %v", err)
}
log.Info("Host IP: ", nodeid)
tailers := []*tail.Tail{}
logFiles := systail.GetConfig().LogFiles
fmt.Printf("%+v\n", logFiles)
if len(logFiles) == 0 {
common.Fatal("No log files exist in configuration.")
}
for name, logfile := range logFiles {
t, err := tailLogFile(name, logfile, nodeid)
if err != nil {
common.Fatal("%v", err)
}
tailers = append(tailers, t)
}
server.MarkRunning("systail")
for _, tail := range tailers {
err := tail.Wait()
if err != nil {
log.Errorf("Cannot tail [%s]: %s", tail.Filename, err)
}
}
// we don't expect any of the tailers to exit with or without
// error.
log.Error("No file left to tail; exiting.")
os.Exit(1)
}