func (handler *Handler) OnStart(container *docker.Container, exit *chan string) error {
configCenter := appconfig.AppConfigCenter()
app, appErr := configCenter.GetDaemonApp(container)
if appErr != nil {
return appErr
}
count := 1
var interval time.Duration
if app.StartAwait != 0 {
count = 3
interval = time.Duration(app.StartAwait/count) * time.Second
}
log.Printf("Start await: total %ds, retry %d, interval %ds", app.StartAwait, count, interval/time.Second)
var valiErr error
for i := 0; i < count; i++ {
time.Sleep(interval)
valiErr = app.Validate()
if valiErr == nil {
break
}
}
if valiErr != nil {
return valiErr
}
client := backends.ZKClient()
if err := client.NewNode(app.NodePath(), app.Node); err != nil {
return err
}
go app.WatchTillDie(exit)
return nil
}
func (app *DaemonApplication) WatchTillDie(exit *chan string) {
client := backends.ZKClient()
interval := time.Duration(app.HealthCheckInterval()) * time.Second
retry := 0
for {
select {
case <-*exit:
log.Printf("Container %s dead.", app.IpAddress)
if err := client.RemoveNode(app.NodePath()); err != nil {
log.Println("Error on quit:", err)
continue
}
return
case <-time.After(interval):
if err := app.Validate(); err != nil && retry >= app.HealthCheckRetry() {
if err := client.RemoveNode(app.NodePath()); err != nil {
log.Println("Error on quit:", err)
continue
}
return
} else if err != nil {
retry += 1
log.Printf("Retried %d on %s", retry, app.IpAddress)
}
}
}
}
func main() {
wg := sync.WaitGroup{}
client := backends.ZKClient()
quitChan := make(map[string]*chan string)
for _, appId := range config.Applications {
quit := make(chan string)
wg.Add(1)
go func(appId string) {
defer wg.Done()
client.Watch(appId, &Handler{}, &quit)
}(appId)
quitChan[appId] = &quit
}
c := make(chan os.Signal, 1)
signal.Notify(c, os.Interrupt, os.Kill, syscall.SIGHUP)
s := <-c
if s != syscall.SIGHUP {
for _, quit := range quitChan {
*quit <- "quit"
}
signal.Stop(c)
wg.Wait()
os.Exit(0)
} else {
warden.ReloadGuardianSettings()
}
}
func main() {
daemonWatcher, daemonError := watcher.NewDaemonWatcher(config.DockerSocket)
if daemonError != nil {
log.Fatal(daemonError)
}
watcherExit := make(chan string)
wg := sync.WaitGroup{}
c := make(chan os.Signal, 1)
signal.Notify(c, os.Interrupt, os.Kill, syscall.SIGHUP)
client := backends.ZKClient()
inited := false
for {
select {
case s := <-c:
if s != syscall.SIGHUP {
watcherExit <- "quit"
signal.Stop(c)
wg.Wait()
os.Exit(0)
} else {
warden.ReloadAgentSettings()
}
case event := <-client.EventChan:
if event.State == zk.StateHasSession {
log.Println("Load for new zk session")
if inited {
watcherExit <- "quit"
}
syncErr := daemonWatcher.SyncContainers(&Handler{})
if syncErr != nil {
log.Fatal(syncErr)
}
wg.Add(1)
go func() {
defer wg.Done()
daemonWatcher.Watch(&Handler{}, &watcherExit)
}()
inited = true
}
default:
}
}
}
