Updated on 2024-07-05 GMT+08:00

Exporting Dead Letter Messages

Function

This API is used to export dead letter messages.

Calling Method

For details, see Calling APIs.

URI

POST /v2/{project_id}/instances/{instance_id}/messages/export

Table 1 Path Parameters

Parameter

Mandatory

Type

Description

project_id

Yes

String

Project ID. For details, see Obtaining a Project ID.

instance_id

Yes

String

Instance ID.

Request Parameters

Table 2 Request body parameters

Parameter

Mandatory

Type

Description

topic

No

String

Topic name.

msg_id_list

No

Array of strings

Message ID list.

uniq_key_list

No

Array of strings

Unique key list.

Response Parameters

Status code: 200

Table 3 Response body parameters

Parameter

Type

Description

[items]

Array of Message objects

Message.

Table 4 Message

Parameter

Type

Description

msg_id

String

Message ID.

instance_id

String

Instance ID.

topic

String

Topic name.

store_timestamp

Number

Time when the message is stored.

born_timestamp

Number

Time when the message is generated.

reconsume_times

Integer

Number of retry times.

body

String

Message body.

body_crc

Number

Message body checksum.

store_size

Number

Storage size.

property_list

Array of property_list objects

Message attribute list.

born_host

String

IP address of the host that generates the message.

store_host

String

IP address of the host that stores the message.

queue_id

Integer

Queue ID.

queue_offset

Integer

Offset in the queue.

Table 5 property_list

Parameter

Type

Description

name

String

Attribute name.

value

String

Attribute value.

Example Requests

Exporting dead letter messages with the specified message IDs and keys in the topic

POST https://{endpoint}/v2/{project_id}/instances/{instance_id}/messages/export

{
  "topic" : "%DLQ%group1",
  "msg_id_list" : [ "C0A8011700002774000000000013B19D", "C0A8011700002774000000000013B30F" ],
  "uniq_key_list" : [ "7F000001001C18B4AAC26B8AED170010", "7F000001001C18B4AAC26B8AEE030015" ]
}

Example Responses

Status code: 200

Dead letter messages exported successfully.

{
  "topic" : "topic_01",
  "body" : "Hello world",
  "property_list" : {
    "name" : "ORIGIN_MESSAGE_ID",
    "value" : "C0A8005B00002775000000000000EBAE"
  },
  "msg_id" : "C0A8005B0000277500000000000133A2",
  "instance_id" : "56055acb-3c3b-4481-aeab-10464086c2b4",
  "store_timestamp" : 1662690563020,
  "born_timestamp" : 1662690324415,
  "reconsume_times" : 5,
  "body_crc" : 198614610,
  "store_size" : 317,
  "born_host" : "10.58.233.224:63529",
  "store_host" : "192.168.0.91:10101",
  "queue_id" : 0,
  "queue_offset" : 0
}

SDK Sample Code

The SDK sample code is as follows.

Exporting dead letter messages with the specified message IDs and keys in the topic

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package com.huaweicloud.sdk.test;

import com.huaweicloud.sdk.core.auth.ICredential;
import com.huaweicloud.sdk.core.auth.BasicCredentials;
import com.huaweicloud.sdk.core.exception.ConnectionException;
import com.huaweicloud.sdk.core.exception.RequestTimeoutException;
import com.huaweicloud.sdk.core.exception.ServiceResponseException;
import com.huaweicloud.sdk.rocketmq.v2.region.RocketMQRegion;
import com.huaweicloud.sdk.rocketmq.v2.*;
import com.huaweicloud.sdk.rocketmq.v2.model.*;

import java.util.List;
import java.util.ArrayList;

public class ExportDlqMessageSolution {

    public static void main(String[] args) {
        // The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security.
        // In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment
        String ak = System.getenv("CLOUD_SDK_AK");
        String sk = System.getenv("CLOUD_SDK_SK");
        String projectId = "{project_id}";

        ICredential auth = new BasicCredentials()
                .withProjectId(projectId)
                .withAk(ak)
                .withSk(sk);

        RocketMQClient client = RocketMQClient.newBuilder()
                .withCredential(auth)
                .withRegion(RocketMQRegion.valueOf("<YOUR REGION>"))
                .build();
        ExportDlqMessageRequest request = new ExportDlqMessageRequest();
        request.withInstanceId("{instance_id}");
        ExportDlqMessageReq body = new ExportDlqMessageReq();
        List<String> listbodyUniqKeyList = new ArrayList<>();
        listbodyUniqKeyList.add("7F000001001C18B4AAC26B8AED170010");
        listbodyUniqKeyList.add("7F000001001C18B4AAC26B8AEE030015");
        List<String> listbodyMsgIdList = new ArrayList<>();
        listbodyMsgIdList.add("C0A8011700002774000000000013B19D");
        listbodyMsgIdList.add("C0A8011700002774000000000013B30F");
        body.withUniqKeyList(listbodyUniqKeyList);
        body.withMsgIdList(listbodyMsgIdList);
        body.withTopic("%DLQ%group1");
        request.withBody(body);
        try {
            ExportDlqMessageResponse response = client.exportDlqMessage(request);
            System.out.println(response.toString());
        } catch (ConnectionException e) {
            e.printStackTrace();
        } catch (RequestTimeoutException e) {
            e.printStackTrace();
        } catch (ServiceResponseException e) {
            e.printStackTrace();
            System.out.println(e.getHttpStatusCode());
            System.out.println(e.getRequestId());
            System.out.println(e.getErrorCode());
            System.out.println(e.getErrorMsg());
        }
    }
}

Exporting dead letter messages with the specified message IDs and keys in the topic

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# coding: utf-8

import os
from huaweicloudsdkcore.auth.credentials import BasicCredentials
from huaweicloudsdkrocketmq.v2.region.rocketmq_region import RocketMQRegion
from huaweicloudsdkcore.exceptions import exceptions
from huaweicloudsdkrocketmq.v2 import *

if __name__ == "__main__":
    # The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security.
    # In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment
    ak = os.environ["CLOUD_SDK_AK"]
    sk = os.environ["CLOUD_SDK_SK"]
    projectId = "{project_id}"

    credentials = BasicCredentials(ak, sk, projectId)

    client = RocketMQClient.new_builder() \
        .with_credentials(credentials) \
        .with_region(RocketMQRegion.value_of("<YOUR REGION>")) \
        .build()

    try:
        request = ExportDlqMessageRequest()
        request.instance_id = "{instance_id}"
        listUniqKeyListbody = [
            "7F000001001C18B4AAC26B8AED170010",
            "7F000001001C18B4AAC26B8AEE030015"
        ]
        listMsgIdListbody = [
            "C0A8011700002774000000000013B19D",
            "C0A8011700002774000000000013B30F"
        ]
        request.body = ExportDlqMessageReq(
            uniq_key_list=listUniqKeyListbody,
            msg_id_list=listMsgIdListbody,
            topic="%DLQ%group1"
        )
        response = client.export_dlq_message(request)
        print(response)
    except exceptions.ClientRequestException as e:
        print(e.status_code)
        print(e.request_id)
        print(e.error_code)
        print(e.error_msg)

Exporting dead letter messages with the specified message IDs and keys in the topic

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package main

import (
	"fmt"
	"github.com/huaweicloud/huaweicloud-sdk-go-v3/core/auth/basic"
    rocketmq "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/rocketmq/v2"
	"github.com/huaweicloud/huaweicloud-sdk-go-v3/services/rocketmq/v2/model"
    region "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/rocketmq/v2/region"
)

func main() {
    // The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security.
    // In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment
    ak := os.Getenv("CLOUD_SDK_AK")
    sk := os.Getenv("CLOUD_SDK_SK")
    projectId := "{project_id}"

    auth := basic.NewCredentialsBuilder().
        WithAk(ak).
        WithSk(sk).
        WithProjectId(projectId).
        Build()

    client := rocketmq.NewRocketMQClient(
        rocketmq.RocketMQClientBuilder().
            WithRegion(region.ValueOf("<YOUR REGION>")).
            WithCredential(auth).
            Build())

    request := &model.ExportDlqMessageRequest{}
	request.InstanceId = "{instance_id}"
	var listUniqKeyListbody = []string{
        "7F000001001C18B4AAC26B8AED170010",
	    "7F000001001C18B4AAC26B8AEE030015",
    }
	var listMsgIdListbody = []string{
        "C0A8011700002774000000000013B19D",
	    "C0A8011700002774000000000013B30F",
    }
	topicExportDlqMessageReq:= "%DLQ%group1"
	request.Body = &model.ExportDlqMessageReq{
		UniqKeyList: &listUniqKeyListbody,
		MsgIdList: &listMsgIdListbody,
		Topic: &topicExportDlqMessageReq,
	}
	response, err := client.ExportDlqMessage(request)
	if err == nil {
        fmt.Printf("%+v\n", response)
    } else {
        fmt.Println(err)
    }
}

For SDK sample code of more programming languages, see the Sample Code tab in API Explorer. SDK sample code can be automatically generated.

Status Codes

Status Code

Description

200

Dead letter messages exported successfully.

Error Codes

See Error Codes.