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)
}
func tailLogFile(
name string, filepath string, nodeid string) (*tail.Tail, error) {
if filepath == "" {
filepath = fmt.Sprintf("/s/logs/%s.log", name)
}
log.Info("Tailing... ", filepath)
t, err := tail.TailFile(filepath, tail.Config{
MaxLineSize: systail.GetConfig().MaxRecordSize,
MustExist: false,
Follow: true,
// ignore existing content, to support subsequent re-runs of systail
Location: &tail.SeekInfo{0, os.SEEK_END},
ReOpen: true,
Poll: false})
if err != nil {
return nil, err
}
go func(name string, tail *tail.Tail) {
pub := logyard.Broker.NewPublisherMust()
defer pub.Stop()
for line := range tail.Lines {
// JSON must be a valid UTF-8 string
if !utf8.ValidString(line.Text) {
line.Text = string([]rune(line.Text))
}
data, err := json.Marshal(systail.Message{
name,
common.NewMessageCommon(line.Text, line.Time, nodeid),
})
if err != nil {
tail.Killf("Failed to encode to JSON: %v", err)
break
}
pub.MustPublish("systail."+name+"."+nodeid, string(data))
}
}(name, t)
return t, nil
}
