make notification as separate package (#5294)

* Remove old notification files

* Add net package

* Add event package

* Modify minio to take new notification system

cmd/bucket-handlers.go

@@ -1,5 +1,5 @@
 /*
- * Minio Cloud Storage, (C) 2015, 2016, 2017 Minio, Inc.
+ * Minio Cloud Storage, (C) 2015, 2016, 2017, 2018 Minio, Inc.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -33,6 +33,7 @@ import (
 	"github.com/minio/minio-go/pkg/policy"
 	"github.com/minio/minio-go/pkg/set"
 	"github.com/minio/minio/pkg/errors"
+	"github.com/minio/minio/pkg/event"
 	"github.com/minio/minio/pkg/hash"
 )
 
@@ -356,10 +357,10 @@ func (api objectAPIHandlers) DeleteMultipleObjectsHandler(w http.ResponseWriter,
 
 	// Notify deleted event for objects.
 	for _, dobj := range deletedObjects {
-		eventNotify(eventData{
-			Type:   ObjectRemovedDelete,
-			Bucket: bucket,
-			ObjInfo: ObjectInfo{
+		sendEvent(eventArgs{
+			EventName:  event.ObjectRemovedDelete,
+			BucketName: bucket,
+			Object: ObjectInfo{
 				Name: dobj.ObjectName,
 			},
 			ReqParams: extractReqParams(r),
@@ -606,14 +607,14 @@ func (api objectAPIHandlers) PostPolicyBucketHandler(w http.ResponseWriter, r *h
 	}
 
 	// Notify object created event.
-	defer eventNotify(eventData{
-		Type:      ObjectCreatedPost,
-		Bucket:    objInfo.Bucket,
-		ObjInfo:   objInfo,
-		ReqParams: extractReqParams(r),
-		UserAgent: r.UserAgent(),
-		Host:      host,
-		Port:      port,
+	defer sendEvent(eventArgs{
+		EventName:  event.ObjectCreatedPost,
+		BucketName: objInfo.Bucket,
+		Object:     objInfo,
+		ReqParams:  extractReqParams(r),
+		UserAgent:  r.UserAgent(),
+		Host:       host,
+		Port:       port,
 	})
 
 	if successRedirect != "" {
@@ -692,6 +693,16 @@ func (api objectAPIHandlers) DeleteBucketHandler(w http.ResponseWriter, r *http.
 		return
 	}
 
+	// Notify all peers (including self) to update in-memory state
+	for addr, err := range globalNotificationSys.UpdateBucketPolicy(bucket) {
+		errorIf(err, "unable to update policy change in remote peer %v", addr)
+	}
+
+	globalNotificationSys.RemoveNotification(bucket)
+	for addr, err := range globalNotificationSys.DeleteBucket(bucket) {
+		errorIf(err, "unable to delete bucket in remote peer %v", addr)
+	}
+
 	// Write success response.
 	writeSuccessNoContent(w)
 }