ApsaraMQ for RocketMQ:Send and receive transactional messages

const {
  MQClient,
  MessageProperties
} = require('@aliyunmq/mq-http-sdk');

// HTTP endpoint from the Instance Details page in the ApsaraMQ for RocketMQ console.
const endpoint = "${HTTP_ENDPOINT}";
// AccessKey credentials from environment variables.
const accessKeyId = process.env['ALIBABA_CLOUD_ACCESS_KEY_ID'];
const accessKeySecret = process.env['ALIBABA_CLOUD_ACCESS_KEY_SECRET'];

var client = new MQClient(endpoint, accessKeyId, accessKeySecret);

// Topic created in the ApsaraMQ for RocketMQ console.
const topic = "${TOPIC}";
// Consumer group ID created in the ApsaraMQ for RocketMQ console.
const groupId = "${GROUP_ID}";
// Instance ID. Set to null or "" if the instance has no namespace.
const instanceId = "${INSTANCE_ID}";

const mqTransProducer = client.getTransProducer(instanceId, topic, groupId);

async function processTransResult(res, msgId) {
    if (!res) {
        return;
    }
    if (res.code != 204) {
      // Commit or rollback failed. The receipt handle may have expired
      // if TransCheckImmunityTime or the consumeHalfMessage timeout elapsed.
      console.log("Commit/Rollback Message Fail:");
      const failHandles = res.body.map((error) => {
        console.log("\tErrorHandle:%s, Code:%s, Reason:%s\n", error.ReceiptHandle, error.ErrorCode, error.ErrorMessage);
        return error.ReceiptHandle;
      });
    } else {
      console.log("Commit/Rollback Message suc!!! %s", msgId);
    }
}

var halfMessageCount = 0;
var halfMessageConsumeCount = 0;

(async function(){
  try {
    // Send four transactional messages.
    for(var i = 0; i < 4; i++) {
      let res;
      msgProps = new MessageProperties();
      // Custom property used by the half-message polling loop
      // to decide whether to commit or roll back.
      msgProps.putProperty("a", i);
      msgProps.messageKey("MessageKey");
      // First transaction check delay: 10 seconds. Valid values: 10-300.
      // After the first check, the broker rechecks every 10 seconds for up to 24 hours.
      msgProps.transCheckImmunityTime(10);
      res = await mqTransProducer.publishMessage("hello mq.", "tagA", msgProps);
      console.log("Publish message: MessageID:%s,BodyMD5:%s,Handle:%s", res.body.MessageId, res.body.MessageBodyMD5, res.body.ReceiptHandle);
      if (res && i == 0) {
          // Commit the first message immediately using its receipt handle.
          const msgId = res.body.MessageId;
          res = await mqTransProducer.commit(res.body.ReceiptHandle);
          console.log("Commit msg when publish, %s", msgId);
        processTransResult(res, msgId);
      }
    }
  } catch(e) {
    // Add retry or persistence logic for failed messages.
    console.log(e)
  }
})();

// Run a separate loop to poll and resolve uncommitted half messages.
(async function() {
  // Poll for half messages, similar to consuming normal messages.
  while(halfMessageCount < 3 && halfMessageConsumeCount < 15) {
    try {
        halfMessageConsumeCount++;
      res = await mqTransProducer.consumeHalfMessage(3, 3);
      if (res.code == 200) {
        console.log("Consume Messages, requestId:%s", res.requestId);
        res.body.forEach(async (message) => {
          console.log("\tMessageId:%s,Tag:%s,PublishTime:%d,NextConsumeTime:%d,FirstConsumeTime:%d,ConsumedTimes:%d,Body:%s" +
            ",Props:%j,MessageKey:%s,Prop-A:%s",
              message.MessageId, message.MessageTag, message.PublishTime, message.NextConsumeTime, message.FirstConsumeTime, message.ConsumedTimes,
              message.MessageBody,message.Properties,message.MessageKey,message.Properties.a);

          var propA = message.Properties && message.Properties.a ? parseInt(message.Properties.a) : 0;
                  var opResp;
                  if (propA == 1 || (propA == 2 && message.ConsumedTimes > 1)) {
                      opResp = await mqTransProducer.commit(message.ReceiptHandle);
                      console.log("Commit msg when check half, %s", message.MessageId);
                      halfMessageCount++;
                  } else if (propA == 3) {
                      opResp = await mqTransProducer.rollback(message.ReceiptHandle);
                      console.log("Rollback msg when check half, %s", message.MessageId);
                      halfMessageCount++;
                  }
                  processTransResult(opResp, message.MessageId);
        });
      }
    } catch(e) {
      if (e.Code && e.Code.indexOf("MessageNotExist") > -1) {
        // No half messages available. Long polling continues.
        console.log("Consume Transaction Half msg: no new message, RequestId:%s, Code:%s", e.RequestId, e.Code);
      } else {
        console.log(e);
      }
    }
  }
})();

const {
  MQClient
} = require('@aliyunmq/mq-http-sdk');

// HTTP endpoint from the Instance Details page in the ApsaraMQ for RocketMQ console.
const endpoint = "${HTTP_ENDPOINT}";
// AccessKey credentials from environment variables.
const accessKeyId = process.env['ALIBABA_CLOUD_ACCESS_KEY_ID'];
const accessKeySecret = process.env['ALIBABA_CLOUD_ACCESS_KEY_SECRET'];

var client = new MQClient(endpoint, accessKeyId, accessKeySecret);

// Topic created in the ApsaraMQ for RocketMQ console.
const topic = "${TOPIC}";
// Consumer group ID created in the ApsaraMQ for RocketMQ console.
const groupId = "${GROUP_ID}";
// Instance ID. Set to null or "" if the instance has no namespace.
const instanceId = "${INSTANCE_ID}";

const consumer = client.getConsumer(instanceId, topic, groupId);

(async function(){
  // Consume messages in a loop.
  while(true) {
    try {
      // Long polling: if no message is available, the request suspends on the broker
      // until a message arrives or the timeout elapses.
      res = await consumer.consumeMessage(
          3, // Max messages per request (up to 16)
          3  // Long polling timeout in seconds (up to 30)
          );

      if (res.code == 200) {
        console.log("Consume Messages, requestId:%s", res.requestId);
        const handles = res.body.map((message) => {
          console.log("\tMessageId:%s,Tag:%s,PublishTime:%d,NextConsumeTime:%d,FirstConsumeTime:%d,ConsumedTimes:%d,Body:%s" +
            ",Props:%j,MessageKey:%s,Prop-A:%s",
              message.MessageId, message.MessageTag, message.PublishTime, message.NextConsumeTime, message.FirstConsumeTime, message.ConsumedTimes,
              message.MessageBody,message.Properties,message.MessageKey,message.Properties.a);
          return message.ReceiptHandle;
        });

        // ACK all processed messages. If the broker does not receive an ACK
        // before NextConsumeTime, it redelivers the message with a new receipt handle.
        res = await consumer.ackMessage(handles);
        if (res.code != 204) {
          // ACK failed. The receipt handle may have expired.
          console.log("Ack Message Fail:");
          const failHandles = res.body.map((error)=>{
            console.log("\tErrorHandle:%s, Code:%s, Reason:%s\n", error.ReceiptHandle, error.ErrorCode, error.ErrorMessage);
            return error.ReceiptHandle;
          });
          handles.forEach((handle)=>{
            if (failHandles.indexOf(handle) < 0) {
              console.log("\tSucHandle:%s\n", handle);
            }
          });
        } else {
          console.log("Ack Message suc, RequestId:%s\n\t", res.requestId, handles.join(','));
        }
      }
    } catch(e) {
      if (e.Code.indexOf("MessageNotExist") > -1) {
        // No messages available. Long polling continues.
        console.log("Consume Message: no new message, RequestId:%s, Code:%s", e.RequestId, e.Code);
      } else {
        console.log(e);
      }
    }
  }
})();