func reloadConfig(filename string, rls ...Reloadable) bool {
log.Infof("Loading configuration file %s", filename)
cfg, err := config.LoadConfig(filename)
if err != nil {
log.Errorf("Failed to load configuration file (-config.file=%s): %v", filename, err)
return false
}
for _, rl := range rls {
rl.ApplyConfig(cfg)
}
return true
}
func (tm *TaskManager) Run() {
log.Info("Starting task manager...")
identities := map[string]struct{}{}
for taskCfg, task := range tm.tasks {
log.Infof("taskCfg = %v", taskCfg)
ch := make(chan *config.UnitConfig)
// Every task has a batch of units.
go tm.handleUnitUpdates(taskCfg, ch)
for _, id := range task.Identity() {
id = fullId(taskCfg, id)
identities[id] = struct{}{}
}
defer func(t Task, c chan *config.UnitConfig) {
go t.Run(c)
}(task, ch)
}
log.Info("before removeUnits")
tm.m.Lock()
defer tm.m.Unlock()
tm.removeUnits(func(id string) bool {
if _, ok := identities[id]; ok {
return false
}
return true
})
tm.running = true
log.Info("Run finished.")
}
func main() {
flag.Parse()
if *versionFlag {
fmt.Println(VERSION)
os.Exit(0)
}
if *logstashFlag {
log.ChangeToLogstashFormater(APP_NAME)
}
log.SetLogFile(LOG_FILE)
if *reloadFlag {
notifyReload()
os.Exit(0)
}
pid := os.Getpid() // This process's pid.
log.Infof("The process id is %d", pid)
// Save the pid into the pid file.
err := utils.WriteFile(PID_FILE, []byte(strconv.Itoa(pid)), 0644)
if err != nil {
log.Fatalln("Error writing this process id:", err)
}
defer os.Remove(PID_FILE)
publisher := outputs.NewPublisherType()
taskManager := fetch.NewTaskManager(publisher)
if !reloadConfig(*cfgFileFlag, publisher, taskManager) {
os.Exit(1)
}
// Wait for receive a singal to reload configuration file.
hupCh := make(chan os.Signal)
hupReady := make(chan bool)
signal.Notify(hupCh, syscall.SIGHUP)
go func() {
<-hupReady
for range hupCh {
reloadConfig(*cfgFileFlag, publisher, taskManager)
}
}()
go taskManager.Run()
defer taskManager.Stop()
defer publisher.StopPublish()
close(hupReady)
// Wait for quit signal to exit this process.
sigCh := make(chan os.Signal)
signal.Notify(sigCh, syscall.SIGINT, syscall.SIGTERM, os.Kill, syscall.SIGKILL)
select {
case s := <-sigCh: // Block until a signal is received.
log.Warnf("Caught Signal: %v, shuting down gracefully...", s)
}
close(hupCh)
log.Info("See you again!")
return
}