Updated on 2024-09-06 GMT+08:00

Creating a Topic

Function

This API is used to create a topic. Each user can create up to 3,000 topics. In high-concurrent scenarios, a user may create a few topics more than 3,000.

The API is idempotent. It returns a successful result after creating a topic. If a topic of the same name already exists, the status code is 200. Otherwise, the status code is 201.

Calling Method

For details, see Calling APIs.

URI

POST /v2/{project_id}/notifications/topics

Table 1 Path Parameters

Parameter

Mandatory

Type

Description

project_id

Yes

String

Specifies the project ID.For details about how to obtain the project ID, see Obtaining the Project ID.

Request Parameters

Table 2 Request header parameters

Parameter

Mandatory

Type

Description

X-Auth-Token

Yes

String

Specifies a user token.

It can be obtained by calling an IAM API. The value of X-Subject-Token in the response header is the user token.

Table 3 Request body parameters

Parameter

Mandatory

Type

Description

name

Yes

String

Specifies the topic name. Enter 1 to 255 characters. Only letters, digits, hyphens (-), and underscores (_) are allowed. The topic name must start with a letter or digit.

display_name

Yes

String

Specifies the topic display name, which is presented as the name of the email sender in email messages. The display name cannot exceed 192 bytes. display_name is left blank by default.

enterprise_project_id

No

String

Specifies the enterprise project ID. It is required only when the enterprise project function is enabled.

Response Parameters

Status code: 201

Table 4 Response body parameters

Parameter

Type

Description

request_id

String

Specifies the request ID, which is unique.

topic_urn

String

Specifies the resource identifier of the topic, which is unique. To obtain the resource identifier, see [Querying Topics].

Status code: 400

Table 5 Response body parameters

Parameter

Type

Description

request_id

String

Specifies the request ID, which is unique.

code

String

Specifies the error code.

message

String

Describes the error message.

Status code: 403

Table 6 Response body parameters

Parameter

Type

Description

request_id

String

Specifies the request ID, which is unique.

code

String

Specifies the error code.

message

String

Describes the error message.

Status code: 404

Table 7 Response body parameters

Parameter

Type

Description

request_id

String

Specifies the request ID, which is unique.

code

String

Specifies the error code.

message

String

Describes the error message.

Status code: 500

Table 8 Response body parameters

Parameter

Type

Description

request_id

String

Specifies the request ID, which is unique.

code

String

Specifies the error code.

message

String

Describes the error message.

Example Requests

Creating a topic with the name of test_topic_v2 and display name of testtest

POST https://{SMN_Endpoint}/v2/{project_id}/notifications/topics

{
  "name" : "test_topic_v2",
  "display_name" : "testtest"
}

Example Responses

Status code: 201

OK

{
  "request_id" : "6a63a18b8bab40ffb71ebd9cb80d0085",
  "topic_urn" : "urn:smn:regionId:f96188c7ccaf4ffba0c9aa149ab2bd57:test_topic_v2"
}

SDK Sample Code

The SDK sample code is as follows.

Java

Creating a topic with the name of test_topic_v2 and display name of testtest

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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.smn.v2.region.SmnRegion;
import com.huaweicloud.sdk.smn.v2.*;
import com.huaweicloud.sdk.smn.v2.model.*;


public class CreateTopicSolution {

    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);

        SmnClient client = SmnClient.newBuilder()
                .withCredential(auth)
                .withRegion(SmnRegion.valueOf("<YOUR REGION>"))
                .build();
        CreateTopicRequest request = new CreateTopicRequest();
        CreateTopicRequestBody body = new CreateTopicRequestBody();
        body.withDisplayName("testtest");
        body.withName("test_topic_v2");
        request.withBody(body);
        try {
            CreateTopicResponse response = client.createTopic(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());
        }
    }
}

Python

Creating a topic with the name of test_topic_v2 and display name of testtest

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# coding: utf-8

import os
from huaweicloudsdkcore.auth.credentials import BasicCredentials
from huaweicloudsdksmn.v2.region.smn_region import SmnRegion
from huaweicloudsdkcore.exceptions import exceptions
from huaweicloudsdksmn.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 = SmnClient.new_builder() \
        .with_credentials(credentials) \
        .with_region(SmnRegion.value_of("<YOUR REGION>")) \
        .build()

    try:
        request = CreateTopicRequest()
        request.body = CreateTopicRequestBody(
            display_name="testtest",
            name="test_topic_v2"
        )
        response = client.create_topic(request)
        print(response)
    except exceptions.ClientRequestException as e:
        print(e.status_code)
        print(e.request_id)
        print(e.error_code)
        print(e.error_msg)

Go

Creating a topic with the name of test_topic_v2 and display name of testtest

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package main

import (
	"fmt"
	"github.com/huaweicloud/huaweicloud-sdk-go-v3/core/auth/basic"
    smn "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/smn/v2"
	"github.com/huaweicloud/huaweicloud-sdk-go-v3/services/smn/v2/model"
    region "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/smn/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 := smn.NewSmnClient(
        smn.SmnClientBuilder().
            WithRegion(region.ValueOf("<YOUR REGION>")).
            WithCredential(auth).
            Build())

    request := &model.CreateTopicRequest{}
	request.Body = &model.CreateTopicRequestBody{
		DisplayName: "testtest",
		Name: "test_topic_v2",
	}
	response, err := client.CreateTopic(request)
	if err == nil {
        fmt.Printf("%+v\n", response)
    } else {
        fmt.Println(err)
    }
}

More

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

201

OK

400

Bad Request

403

Unauthorized

404

Not Found

500

Internal Server Error

Error Codes

See Error Codes.