ApsaraMQ for RocketMQ:Send and receive ordered messages

package main

import (
    "fmt"
    "time"
    "strconv"
    "os"

    "github.com/aliyunmq/mq-http-go-sdk"
)

func main() {
    // HTTP endpoint from the Instance Details page in the ApsaraMQ for RocketMQ console.
    endpoint := "${HTTP_ENDPOINT}"
    // Set the ALIBABA_CLOUD_ACCESS_KEY_ID and ALIBABA_CLOUD_ACCESS_KEY_SECRET
    // environment variables before running this code.
    accessKey := os.Getenv("ALIBABA_CLOUD_ACCESS_KEY_ID")
    secretKey := os.Getenv("ALIBABA_CLOUD_ACCESS_KEY_SECRET")
    // Topic created in the ApsaraMQ for RocketMQ console.
    topic := "${TOPIC}"
    // Instance ID. If the instance has a namespace, specify the ID.
    // If not, set this to an empty string.
    instanceId := "${INSTANCE_ID}"

    client := mq_http_sdk.NewAliyunMQClient(endpoint, accessKey, secretKey, "")

    mqProducer := client.GetProducer(instanceId, topic)
    // Send 8 messages across 2 partitions.
    for i := 0; i < 8; i++ {
        msg := mq_http_sdk.PublishMessageRequest{
            MessageBody: "hello mq!",
            MessageTag:  "",
            Properties:  map[string]string{},
        }
        msg.MessageKey = "MessageKey"
        msg.Properties["a"] = strconv.Itoa(i)
        // Sharding key determines the partition.
        // Messages with the same sharding key are delivered in FIFO order.
        msg.ShardingKey = strconv.Itoa(i % 2)
        ret, err := mqProducer.PublishMessage(msg)

        if err != nil {
            fmt.Println(err)
            return
        } else {
            fmt.Printf("Publish ---->\n\tMessageId:%s, BodyMD5:%s, \n", ret.MessageId, ret.MessageBodyMD5)
        }
        time.Sleep(time.Duration(100) * time.Millisecond)
    }
}

package main

import (
    "fmt"
    "github.com/gogap/errors"
    "strings"
    "time"
    "os"

    "github.com/aliyunmq/mq-http-go-sdk"
)

func main() {
    // HTTP endpoint from the Instance Details page in the ApsaraMQ for RocketMQ console.
    endpoint := "${HTTP_ENDPOINT}"
    // Set the ALIBABA_CLOUD_ACCESS_KEY_ID and ALIBABA_CLOUD_ACCESS_KEY_SECRET
    // environment variables before running this code.
    accessKey := os.Getenv("ALIBABA_CLOUD_ACCESS_KEY_ID")
    secretKey := os.Getenv("ALIBABA_CLOUD_ACCESS_KEY_SECRET")
    // Topic created in the ApsaraMQ for RocketMQ console.
    topic := "${TOPIC}"
    // Instance ID. If the instance has a namespace, specify the ID.
    // If not, set this to an empty string.
    instanceId := "${INSTANCE_ID}"
    // Consumer group created in the ApsaraMQ for RocketMQ console.
    groupId := "${GROUP_ID}"

    client := mq_http_sdk.NewAliyunMQClient(endpoint, accessKey, secretKey, "")

    mqConsumer := client.GetConsumer(instanceId, topic, groupId, "")

    for {
        endChan := make(chan int)
        respChan := make(chan mq_http_sdk.ConsumeMessageResponse)
        errChan := make(chan error)
        go func() {
            select {
            case resp := <-respChan:
                {
                    var handles []string
                    fmt.Printf("Consume %d messages---->\n", len(resp.Messages))
                    for _, v := range resp.Messages {
                        handles = append(handles, v.ReceiptHandle)
                        fmt.Printf("\tMessageID: %s, PublishTime: %d, MessageTag: %s\n"+
                            "\tConsumedTimes: %d, FirstConsumeTime: %d, NextConsumeTime: %d\n"+
                            "\tBody: %s\n"+
                            "\tProps: %s\n"+
                            "\tShardingKey: %s\n",
                            v.MessageId, v.PublishTime, v.MessageTag, v.ConsumedTimes,
                            v.FirstConsumeTime, v.NextConsumeTime, v.MessageBody, v.Properties, v.ShardingKey)
                    }

                    // Acknowledge all messages in this batch.
                    // If the broker does not receive an ACK before NextConsumeTime,
                    // it redelivers the message.
                    ackerr := mqConsumer.AckMessage(handles)
                    if ackerr != nil {
                        fmt.Println(ackerr)
                        if errAckItems, ok := ackerr.(errors.ErrCode).Context()["Detail"].([]mq_http_sdk.ErrAckItem); ok {
                           for _, errAckItem := range errAckItems {
                              fmt.Printf("\tErrorHandle:%s, ErrorCode:%s, ErrorMsg:%s\n",
                                 errAckItem.ErrorHandle, errAckItem.ErrorCode, errAckItem.ErrorMsg)
                           }
                        } else {
                           fmt.Println("ack err =", ackerr)
                        }
                        time.Sleep(time.Duration(3) * time.Second)
                    } else {
                        fmt.Printf("Ack ---->\n\t%s\n", handles)
                    }

                    endChan <- 1
                }
            case err := <-errChan:
                {
                    if strings.Contains(err.(errors.ErrCode).Error(), "MessageNotExist") {
                        fmt.Println("\nNo new message, continue!")
                    } else {
                        fmt.Println(err)
                        time.Sleep(time.Duration(3) * time.Second)
                    }
                    endChan <- 1
                }
            case <-time.After(35 * time.Second):
                {
                    fmt.Println("Timeout of consumer message ??")
                    endChan <- 1
                }
            }
        }()

        // The consumer pulls partitionally ordered messages partition by partition.
        // Within each partition, the next batch is delivered only after all messages
        // in the current batch are acknowledged.
        // Long polling: if no message is available, the request is held on the broker
        // for up to the specified polling duration. The network timeout is 35 seconds.
        mqConsumer.ConsumeMessageOrderly(respChan, errChan,
            3, // Max messages per batch (up to 16).
            3, // Long polling duration in seconds (up to 30).
        )
        <-endChan
    }
}

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