make event manager just do initial only once

internal/events/events.go

@@ -5,13 +5,18 @@
 package events
 
 import (
+	"sync"
+
 	"github.com/alimy/tryst/event"
 	"github.com/alimy/tryst/pool"
 	"github.com/rocboss/paopao-ce/internal/conf"
 	"github.com/sirupsen/logrus"
 )
 
-var _defaultEventManager event.EventManager
+var (
+	_defaultEventManager event.EventManager
+	_onceInitial         sync.Once
+)
 
 // OnEvent push event to gorotine pool then handled automatic.
 func OnEvent(event event.Event) {
@@ -19,6 +24,7 @@ func OnEvent(event event.Event) {
 }
 
 func Initial() {
+	_onceInitial.Do(func() {
 		var opts []pool.Option
 		s := conf.EventManagerSetting
 		if s.MinWorker > 5 {
@@ -40,6 +46,7 @@ func Initial() {
 		_defaultEventManager = event.NewEventManager(func(req event.Event, err error) {
 			logrus.Errorf("handle event[%s] occurs error: %s", req.Name(), err)
 		}, opts...)
+	})
 }
 
 func Restart() {