Hello Amazon SNS

The following code examples show how to get started using Amazon SNS.

.NET

AWS SDK for .NET

Note

There's more on GitHub. Find the complete example and learn how to set up and run in the AWS Code Examples Repository.

using Amazon.SimpleNotificationService;
using Amazon.SimpleNotificationService.Model;

namespace SNSActions;

public static class HelloSNS
{
    static async Task Main(string[] args)
    {
        var snsClient = new AmazonSimpleNotificationServiceClient();

        Console.WriteLine($"Hello Amazon SNS! Following are some of your topics:");
        Console.WriteLine();

        // You can use await and any of the async methods to get a response.
        // Let's get a list of topics.
        var response = await snsClient.ListTopicsAsync(
            new ListTopicsRequest());

        foreach (var topic in response.Topics)
        {
            Console.WriteLine($"\tTopic ARN: {topic.TopicArn}");
            Console.WriteLine();
        }
    }
}

• For API details, see ListTopics in AWS SDK for .NET API Reference.

C++

SDK for C++

Note

There's more on GitHub. Find the complete example and learn how to set up and run in the AWS Code Examples Repository.

Code for the CMakeLists.txt CMake file.

# Set the minimum required version of CMake for this project.
cmake_minimum_required(VERSION 3.13)

# Set the AWS service components used by this project.
set(SERVICE_COMPONENTS sns)

# Set this project's name.
project("hello_sns")

# Set the C++ standard to use to build this target.
# At least C++ 11 is required for the AWS SDK for C++.
set(CMAKE_CXX_STANDARD 11)

# Use the MSVC variable to determine if this is a Windows build.
set(WINDOWS_BUILD ${MSVC})

if (WINDOWS_BUILD) # Set the location where CMake can find the installed libraries for the AWS SDK.
    string(REPLACE ";" "/aws-cpp-sdk-all;" SYSTEM_MODULE_PATH "${CMAKE_SYSTEM_PREFIX_PATH}/aws-cpp-sdk-all")
    list(APPEND CMAKE_PREFIX_PATH ${SYSTEM_MODULE_PATH})
endif ()

# Find the AWS SDK for C++ package.
find_package(AWSSDK REQUIRED COMPONENTS ${SERVICE_COMPONENTS})

if (WINDOWS_BUILD AND AWSSDK_INSTALL_AS_SHARED_LIBS)
    # Copy relevant AWS SDK for C++ libraries into the current binary directory for running and debugging.

    # set(BIN_SUB_DIR "/Debug") # If you are building from the command line you may need to uncomment this
    # and set the proper subdirectory to the executables' location.

    AWSSDK_CPY_DYN_LIBS(SERVICE_COMPONENTS "" ${CMAKE_CURRENT_BINARY_DIR}${BIN_SUB_DIR})
endif ()

add_executable(${PROJECT_NAME}
        hello_sns.cpp)

target_link_libraries(${PROJECT_NAME}
        ${AWSSDK_LINK_LIBRARIES})

Code for the hello_sns.cpp source file.

#include <aws/core/Aws.h>
#include <aws/sns/SNSClient.h>
#include <aws/sns/model/ListTopicsRequest.h>
#include <iostream>

/*
 *  A "Hello SNS" starter application which initializes an Amazon Simple Notification
 *  Service (Amazon SNS) client and lists the SNS topics in the current account.
 *
 *  main function
 *
 *  Usage: 'hello_sns'
 *
 */

int main(int argc, char **argv) {
    Aws::SDKOptions options;
    // Optionally change the log level for debugging.
//   options.loggingOptions.logLevel = Utils::Logging::LogLevel::Debug;
    Aws::InitAPI(options); // Should only be called once.
    {
        Aws::Client::ClientConfiguration clientConfig;
        // Optional: Set to the AWS Region (overrides config file).
        // clientConfig.region = "us-east-1";

        Aws::SNS::SNSClient snsClient(clientConfig);

        Aws::Vector<Aws::SNS::Model::Topic> allTopics;
        Aws::String nextToken; // Next token is used to handle a paginated response.
        do {
            Aws::SNS::Model::ListTopicsRequest request;

            if (!nextToken.empty()) {
                request.SetNextToken(nextToken);
            }

            const Aws::SNS::Model::ListTopicsOutcome outcome = snsClient.ListTopics(
                    request);

            if (outcome.IsSuccess()) {
                const Aws::Vector<Aws::SNS::Model::Topic> &paginatedTopics =
                        outcome.GetResult().GetTopics();
                if (!paginatedTopics.empty()) {
                    allTopics.insert(allTopics.cend(), paginatedTopics.cbegin(),
                                     paginatedTopics.cend());
                }
            }
            else {
                std::cerr << "Error listing topics " << outcome.GetError().GetMessage()
                          << std::endl;
                return 1;
            }

            nextToken = outcome.GetResult().GetNextToken();
        } while (!nextToken.empty());

        std::cout << "Hello Amazon SNS! You have " << allTopics.size() << " topic"
                  << (allTopics.size() == 1 ? "" : "s") << " in your account."
                  << std::endl;

        if (!allTopics.empty()) {
            std::cout << "Here are your topic ARNs." << std::endl;
            for (const Aws::SNS::Model::Topic &topic: allTopics) {
                std::cout << "  * " << topic.GetTopicArn() << std::endl;
            }
        }
    }


    Aws::ShutdownAPI(options); // Should only be called once.
    return 0;
}

• For API details, see ListTopics in AWS SDK for C++ API Reference.

Go

SDK for Go V2

Note

There's more on GitHub. Find the complete example and learn how to set up and run in the AWS Code Examples Repository.

package main

import (
	"context"
	"fmt"
	"log"

	"github.com/aws/aws-sdk-go-v2/config"
	"github.com/aws/aws-sdk-go-v2/service/sns"
	"github.com/aws/aws-sdk-go-v2/service/sns/types"
)

// main uses the AWS SDK for Go V2 to create an Amazon Simple Notification Service
// (Amazon SNS) client and list the topics in your account.
// This example uses the default settings specified in your shared credentials
// and config files.
func main() {
	ctx := context.Background()
	sdkConfig, err := config.LoadDefaultConfig(ctx)
	if err != nil {
		fmt.Println("Couldn't load default configuration. Have you set up your AWS account?")
		fmt.Println(err)
		return
	}
	snsClient := sns.NewFromConfig(sdkConfig)
	fmt.Println("Let's list the topics for your account.")
	var topics []types.Topic
	paginator := sns.NewListTopicsPaginator(snsClient, &sns.ListTopicsInput{})
	for paginator.HasMorePages() {
		output, err := paginator.NextPage(ctx)
		if err != nil {
			log.Printf("Couldn't get topics. Here's why: %v\n", err)
			break
		} else {
			topics = append(topics, output.Topics...)
		}
	}
	if len(topics) == 0 {
		fmt.Println("You don't have any topics!")
	} else {
		for _, topic := range topics {
			fmt.Printf("\t%v\n", *topic.TopicArn)
		}
	}
}

• For API details, see ListTopics in AWS SDK for Go API Reference.

Java

SDK for Java 2.x

Note

There's more on GitHub. Find the complete example and learn how to set up and run in the AWS Code Examples Repository.

package com.example.sns;

import software.amazon.awssdk.regions.Region;
import software.amazon.awssdk.services.sns.SnsClient;
import software.amazon.awssdk.services.sns.model.SnsException;
import software.amazon.awssdk.services.sns.paginators.ListTopicsIterable;

public class HelloSNS {
    public static void main(String[] args) {
        SnsClient snsClient = SnsClient.builder()
                .region(Region.US_EAST_1)
                .build();

        listSNSTopics(snsClient);
        snsClient.close();
    }

    public static void listSNSTopics(SnsClient snsClient) {
        try {
            ListTopicsIterable listTopics = snsClient.listTopicsPaginator();
            listTopics.stream()
                    .flatMap(r -> r.topics().stream())
                    .forEach(content -> System.out.println(" Topic ARN: " + content.topicArn()));

        } catch (SnsException e) {
            System.err.println(e.awsErrorDetails().errorMessage());
            System.exit(1);
        }
    }
}

• For API details, see ListTopics in AWS SDK for Java 2.x API Reference.

JavaScript

SDK for JavaScript (v3)

Note

There's more on GitHub. Find the complete example and learn how to set up and run in the AWS Code Examples Repository.

Initialize an SNS client and and list topics in your account.

import { SNSClient, paginateListTopics } from "@aws-sdk/client-sns";

export const helloSns = async () => {
  // The configuration object (`{}`) is required. If the region and credentials
  // are omitted, the SDK uses your local configuration if it exists.
  const client = new SNSClient({});

  // You can also use `ListTopicsCommand`, but to use that command you must
  // handle the pagination yourself. You can do that by sending the `ListTopicsCommand`
  // with the `NextToken` parameter from the previous request.
  const paginatedTopics = paginateListTopics({ client }, {});
  const topics = [];

  for await (const page of paginatedTopics) {
    if (page.Topics?.length) {
      topics.push(...page.Topics);
    }
  }

  const suffix = topics.length === 1 ? "" : "s";

  console.log(
    `Hello, Amazon SNS! You have ${topics.length} topic${suffix} in your account.`,
  );
  console.log(topics.map((t) => `  * ${t.TopicArn}`).join("\n"));
};

• For API details, see ListTopics in AWS SDK for JavaScript API Reference.

Kotlin

SDK for Kotlin

Note

There's more on GitHub. Find the complete example and learn how to set up and run in the AWS Code Examples Repository.

import aws.sdk.kotlin.services.sns.SnsClient
import aws.sdk.kotlin.services.sns.model.ListTopicsRequest
import aws.sdk.kotlin.services.sns.paginators.listTopicsPaginated
import kotlinx.coroutines.flow.transform

/**
Before running this Kotlin code example, set up your development environment,
including your credentials.

For more information, see the following documentation topic:
https://docs.aws.amazon.com/sdk-for-kotlin/latest/developer-guide/setup.html
 */
suspend fun main() {
    listTopicsPag()
}

suspend fun listTopicsPag() {
    SnsClient { region = "us-east-1" }.use { snsClient ->
        snsClient
            .listTopicsPaginated(ListTopicsRequest { })
            .transform { it.topics?.forEach { topic -> emit(topic) } }
            .collect { topic ->
                println("The topic ARN is ${topic.topicArn}")
            }
    }
}

• For API details, see ListTopics in AWS SDK for Kotlin API reference.