Add aliyun MNS queue support. (#19)

* Add aliyun MNS queue support.

* Update mns queue: support credential refresh.

* Add region in option.

* Add examples for MNS queue.

* Fix: do not return err when receive messages in empty queue.

* Update comment.

cloud/common.go

@@ -20,6 +20,24 @@ const (
 	StandaloneRedisProviderV7 Provider = "standalone_redis_v7"
 	ClusterRedisProviderV7    Provider = "cluster_redis_v7"
 	AliCloudStorageProvider   Provider = "alicloud_storage"
+	AliCloudMNSQueueProvider  Provider = "alicloud_mns_queue"
+)
+
+type AliCloudCredentialType string
+
+const (
+	AliCloudAccessKeyCredentialType   AliCloudCredentialType = "access_key"
+	AliCloudECSRamRoleCredentialType  AliCloudCredentialType = "ecs_ram_role"
+	AliCloudOIDCRoleARNCredentialType AliCloudCredentialType = "oidc_role_arn"
+)
+
+const (
+	AliCloudEnvAccessKeyID     = "ALIBABA_CLOUD_ACCESS_KEY_ID"
+	AliCloudEnvAccessKeySecret = "ALIBABA_CLOUD_ACCESS_KEY_SECRET"
+	AliCloudEnvRoleArn         = "ALIBABA_CLOUD_ROLE_ARN"
+	AliCloudEnvOIDCProviderArn = "ALIBABA_CLOUD_OIDC_PROVIDER_ARN"
+	AliCloudEnvOIDCTokenFile   = "ALIBABA_CLOUD_OIDC_TOKEN_FILE"
+	AliCloudEnvRoleSessionName = "ALIBABA_CLOUD_ROLE_SESSION_NAME"
 )
 
 var (

cloud/examples/queue/queue.go

@@ -70,6 +70,24 @@ func main() {
 		},
 	}
 	queue_examples("redis_cluster_queue_v7", clusterRedisQueueOptionV7)
+
+	// alicloud MNS queue: access_key CredentialType
+	mnsQueueOption := queue.AliMNSClientOption{
+		EndPoint:        "http://account-id.mns.region.aliyuncs.com",
+		CredentialType:  cloud.AliCloudAccessKeyCredentialType,
+		AccessKeyId:     "alicloud_access_key_id",
+		AccessKeySecret: "alicloud_access_key_secret",
+		MessagePriority: 10,
+	}
+	queue_examples("mns_queue_name", mnsQueueOption)
+
+	// alicloud MNS queue: ecs_ram_role credentialType
+	mnsQueueOption = queue.AliMNSClientOption{
+		EndPoint:       "http://account-id.mns.region.aliyuncs.com",
+		CredentialType: cloud.AliCloudECSRamRoleCredentialType,
+	}
+	queue_examples("mns_queue_name", mnsQueueOption)
+	alicloud_mns_queue_examples("mns_queue_name", mnsQueueOption)
 }
 
 func queue_examples(queueOrTopicName string, option cloud.Option) {
@@ -125,3 +143,62 @@ func queue_examples(queueOrTopicName string, option cloud.Option) {
 		fmt.Printf("ack message %s\n", message.Body())
 	}
 }
+
+// The following examples show mns queue specific examples: How to set message priority; how to set long polling period seconds.
+func alicloud_mns_queue_examples(queueOrTopicName string, option cloud.Option) {
+	service, err := queue.GetQueueService(queueOrTopicName, option)
+	if err != nil {
+		fmt.Printf("get queue service error %s %+v %s\n", queueOrTopicName, option, err)
+		return
+	}
+	defer service.Close()
+	fmt.Printf("get service %+v\n", service)
+
+	producer, err := service.CreateProducer()
+	if err != nil {
+		fmt.Printf("create producer error %s\n", err)
+		return
+	}
+	defer producer.Close()
+
+	consumer, err := service.CreateConsumer()
+	if err != nil {
+		fmt.Printf("create consumer error %s\n", err)
+		return
+	}
+	defer consumer.Close()
+
+	ts := int(time.Now().Unix())
+	var messages []string
+	for i := 0; i < 3; i++ {
+		messages = append(messages, fmt.Sprintf("message %d", ts+i))
+	}
+	for _, message := range messages {
+		// rewrite message priority
+		ctx := context.WithValue(context.TODO(), queue.ContextKeyAliMNSMessagePriority, 5)
+		err = producer.SendMessage(ctx, message)
+		if err != nil {
+			fmt.Printf("producer send message error %s", err)
+			return
+		}
+		fmt.Printf("producer send message %s\n", message)
+	}
+	// rewrite long polling period
+	ctx := context.WithValue(context.TODO(), queue.ContextKeyAliMNSLongPollingWaitSeconds, 10)
+	receivedMsgs, err := consumer.ReceiveMessages(ctx, 10)
+	if err != nil {
+		fmt.Printf("receive messages error %s", err)
+		return
+	}
+	for _, message := range receivedMsgs {
+		fmt.Printf("received message %s\n", message.Body())
+	}
+	for _, message := range receivedMsgs {
+		err := consumer.AckMessage(context.TODO(), message)
+		if err != nil {
+			fmt.Printf("ack message error %s %s\n", message.Body(), err)
+			return
+		}
+		fmt.Printf("ack message %s\n", message.Body())
+	}
+}