Publish to an Amazon SNS topic using an Amazon SDK - Amazon Simple Notification Service
Services or capabilities described in Amazon Web Services documentation might vary by Region. To see the differences applicable to the China Regions, see Getting Started with Amazon Web Services in China (PDF).

Publish to an Amazon SNS topic using an Amazon SDK

The following code examples show how to publish messages to an Amazon SNS topic.

Action examples are code excerpts from larger programs and must be run in context. You can see this action in context in the following code examples:

.NET
Amazon SDK for .NET
Note

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

Publish a message to a topic.

using System; using System.Threading.Tasks; using Amazon.SimpleNotificationService; using Amazon.SimpleNotificationService.Model; /// <summary> /// This example publishes a message to an Amazon Simple Notification /// Service (Amazon SNS) topic. /// </summary> public class PublishToSNSTopic { public static async Task Main() { string topicArn = "arn:aws:sns:us-east-2:000000000000:ExampleSNSTopic"; string messageText = "This is an example message to publish to the ExampleSNSTopic."; IAmazonSimpleNotificationService client = new AmazonSimpleNotificationServiceClient(); await PublishToTopicAsync(client, topicArn, messageText); } /// <summary> /// Publishes a message to an Amazon SNS topic. /// </summary> /// <param name="client">The initialized client object used to publish /// to the Amazon SNS topic.</param> /// <param name="topicArn">The ARN of the topic.</param> /// <param name="messageText">The text of the message.</param> public static async Task PublishToTopicAsync( IAmazonSimpleNotificationService client, string topicArn, string messageText) { var request = new PublishRequest { TopicArn = topicArn, Message = messageText, }; var response = await client.PublishAsync(request); Console.WriteLine($"Successfully published message ID: {response.MessageId}"); } }

Publish a message to a topic with an attribute and optional deduplication and group IDs.

/// <summary> /// Publish a message to a topic with an attribute and optional deduplication and group IDs. /// </summary> /// <param name="topicArn">The ARN of the topic.</param> /// <param name="message">The message to publish.</param> /// <param name="attributeName">The optional attribute for the message.</param> /// <param name="attributeValue">The optional attribute value for the message.</param> /// <param name="deduplicationId">The optional deduplication ID for the message.</param> /// <param name="groupId">The optional group ID for the message.</param> /// <returns>The ID of the message published.</returns> public async Task<string> PublishToTopicWithAttribute( string topicArn, string message, string? attributeName = null, string? attributeValue = null, string? deduplicationId = null, string? groupId = null) { var publishRequest = new PublishRequest() { TopicArn = topicArn, Message = message, MessageDeduplicationId = deduplicationId, MessageGroupId = groupId }; if (attributeValue != null) { // Add the string attribute if it exists. publishRequest.MessageAttributes = new Dictionary<string, MessageAttributeValue> { { attributeName!, new MessageAttributeValue() { StringValue = attributeValue, DataType = "String"} } }; } var publishResponse = await _amazonSNSClient.PublishAsync(publishRequest); return publishResponse.MessageId; }
  • For API details, see Publish in Amazon 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 Amazon Code Examples Repository.

//! Send a message to an Amazon Simple Notification Service (Amazon SNS) topic. /*! \param message: The message to publish. \param topicARN: The Amazon Resource Name (ARN) for an Amazon SNS topic. \param clientConfiguration: AWS client configuration. \return bool: Function succeeded. */ bool AwsDoc::SNS::publishToTopic(const Aws::String &message, const Aws::String &topicARN, const Aws::Client::ClientConfiguration &clientConfiguration) { Aws::SNS::SNSClient snsClient(clientConfiguration); Aws::SNS::Model::PublishRequest request; request.SetMessage(message); request.SetTopicArn(topicARN); const Aws::SNS::Model::PublishOutcome outcome = snsClient.Publish(request); if (outcome.IsSuccess()) { std::cout << "Message published successfully with id '" << outcome.GetResult().GetMessageId() << "'." << std::endl; } else { std::cerr << "Error while publishing message " << outcome.GetError().GetMessage() << std::endl; } return outcome.IsSuccess(); }
  • For API details, see Publish in Amazon SDK for C++ API Reference.

CLI
Amazon CLI

Example 1: To publish a message to a topic

The following publish example publishes the specified message to the specified SNS topic. The message comes from a text file, which enables you to include line breaks.

aws sns publish \ --topic-arn "arn:aws:sns:us-west-2:123456789012:my-topic" \ --message file://message.txt

Contents of message.txt:

Hello World Second Line

Output:

{ "MessageId": "123a45b6-7890-12c3-45d6-111122223333" }

Example 2: To publish an SMS message to a phone number

The following publish example publishes the message Hello world! to the phone number +1-555-555-0100.

aws sns publish \ --message "Hello world!" \ --phone-number +1-555-555-0100

Output:

{ "MessageId": "123a45b6-7890-12c3-45d6-333322221111" }
  • For API details, see Publish in Amazon CLI Command 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 Amazon Code Examples Repository.

// SnsActions encapsulates the Amazon Simple Notification Service (Amazon SNS) actions // used in the examples. type SnsActions struct { SnsClient *sns.Client } // Publish publishes a message to an Amazon SNS topic. The message is then sent to all // subscribers. When the topic is a FIFO topic, the message must also contain a group ID // and, when ID-based deduplication is used, a deduplication ID. An optional key-value // filter attribute can be specified so that the message can be filtered according to // a filter policy. func (actor SnsActions) Publish(topicArn string, message string, groupId string, dedupId string, filterKey string, filterValue string) error { publishInput := sns.PublishInput{TopicArn: aws.String(topicArn), Message: aws.String(message)} if groupId != "" { publishInput.MessageGroupId = aws.String(groupId) } if dedupId != "" { publishInput.MessageDeduplicationId = aws.String(dedupId) } if filterKey != "" && filterValue != "" { publishInput.MessageAttributes = map[string]types.MessageAttributeValue{ filterKey: {DataType: aws.String("String"), StringValue: aws.String(filterValue)}, } } _, err := actor.SnsClient.Publish(context.TODO(), &publishInput) if err != nil { log.Printf("Couldn't publish message to topic %v. Here's why: %v", topicArn, err) } return err }
  • For API details, see Publish in Amazon 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 Amazon Code Examples Repository.

import software.amazon.awssdk.regions.Region; import software.amazon.awssdk.services.sns.SnsClient; import software.amazon.awssdk.services.sns.model.PublishRequest; import software.amazon.awssdk.services.sns.model.PublishResponse; import software.amazon.awssdk.services.sns.model.SnsException; /** * Before running this Java V2 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-java/latest/developer-guide/get-started.html */ public class PublishTopic { public static void main(String[] args) { final String usage = """ Usage: <message> <topicArn> Where: message - The message text to send. topicArn - The ARN of the topic to publish. """; if (args.length != 2) { System.out.println(usage); System.exit(1); } String message = args[0]; String topicArn = args[1]; SnsClient snsClient = SnsClient.builder() .region(Region.US_EAST_1) .build(); pubTopic(snsClient, message, topicArn); snsClient.close(); } public static void pubTopic(SnsClient snsClient, String message, String topicArn) { try { PublishRequest request = PublishRequest.builder() .message(message) .topicArn(topicArn) .build(); PublishResponse result = snsClient.publish(request); System.out .println(result.messageId() + " Message sent. Status is " + result.sdkHttpResponse().statusCode()); } catch (SnsException e) { System.err.println(e.awsErrorDetails().errorMessage()); System.exit(1); } } }
  • For API details, see Publish in Amazon 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 Amazon Code Examples Repository.

Create the client in a separate module and export it.

import { SNSClient } from "@aws-sdk/client-sns"; // The AWS Region can be provided here using the `region` property. If you leave it blank // the SDK will default to the region set in your AWS config. export const snsClient = new SNSClient({});

Import the SDK and client modules and call the API.

import { PublishCommand } from "@aws-sdk/client-sns"; import { snsClient } from "../libs/snsClient.js"; /** * @param {string | Record<string, any>} message - The message to send. Can be a plain string or an object * if you are using the `json` `MessageStructure`. * @param {string} topicArn - The ARN of the topic to which you would like to publish. */ export const publish = async ( message = "Hello from SNS!", topicArn = "TOPIC_ARN", ) => { const response = await snsClient.send( new PublishCommand({ Message: message, TopicArn: topicArn, }), ); console.log(response); // { // '$metadata': { // httpStatusCode: 200, // requestId: 'e7f77526-e295-5325-9ee4-281a43ad1f05', // extendedRequestId: undefined, // cfId: undefined, // attempts: 1, // totalRetryDelay: 0 // }, // MessageId: 'xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx' // } return response; };
Kotlin
SDK for Kotlin
Note

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

suspend fun pubTopic(topicArnVal: String, messageVal: String) { val request = PublishRequest { message = messageVal topicArn = topicArnVal } SnsClient { region = "us-east-1" }.use { snsClient -> val result = snsClient.publish(request) println("${result.messageId} message sent.") } }
  • For API details, see Publish in Amazon SDK for Kotlin API reference.

PHP
SDK for PHP
Note

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

require 'vendor/autoload.php'; use Aws\Exception\AwsException; use Aws\Sns\SnsClient; /** * Sends a message to an Amazon SNS topic. * * This code expects that you have AWS credentials set up per: * https://docs.aws.amazon.com/sdk-for-php/v3/developer-guide/guide_credentials.html */ $SnSclient = new SnsClient([ 'profile' => 'default', 'region' => 'us-east-1', 'version' => '2010-03-31' ]); $message = 'This message is sent from a Amazon SNS code sample.'; $topic = 'arn:aws:sns:us-east-1:111122223333:MyTopic'; try { $result = $SnSclient->publish([ 'Message' => $message, 'TopicArn' => $topic, ]); var_dump($result); } catch (AwsException $e) { // output error message if fails error_log($e->getMessage()); }
Python
SDK for Python (Boto3)
Note

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

Publish a message with attributes so that a subscription can filter based on attributes.

class SnsWrapper: """Encapsulates Amazon SNS topic and subscription functions.""" def __init__(self, sns_resource): """ :param sns_resource: A Boto3 Amazon SNS resource. """ self.sns_resource = sns_resource @staticmethod def publish_message(topic, message, attributes): """ Publishes a message, with attributes, to a topic. Subscriptions can be filtered based on message attributes so that a subscription receives messages only when specified attributes are present. :param topic: The topic to publish to. :param message: The message to publish. :param attributes: The key-value attributes to attach to the message. Values must be either `str` or `bytes`. :return: The ID of the message. """ try: att_dict = {} for key, value in attributes.items(): if isinstance(value, str): att_dict[key] = {"DataType": "String", "StringValue": value} elif isinstance(value, bytes): att_dict[key] = {"DataType": "Binary", "BinaryValue": value} response = topic.publish(Message=message, MessageAttributes=att_dict) message_id = response["MessageId"] logger.info( "Published message with attributes %s to topic %s.", attributes, topic.arn, ) except ClientError: logger.exception("Couldn't publish message to topic %s.", topic.arn) raise else: return message_id

Publish a message that takes different forms based on the protocol of the subscriber.

class SnsWrapper: """Encapsulates Amazon SNS topic and subscription functions.""" def __init__(self, sns_resource): """ :param sns_resource: A Boto3 Amazon SNS resource. """ self.sns_resource = sns_resource @staticmethod def publish_multi_message( topic, subject, default_message, sms_message, email_message ): """ Publishes a multi-format message to a topic. A multi-format message takes different forms based on the protocol of the subscriber. For example, an SMS subscriber might receive a short version of the message while an email subscriber could receive a longer version. :param topic: The topic to publish to. :param subject: The subject of the message. :param default_message: The default version of the message. This version is sent to subscribers that have protocols that are not otherwise specified in the structured message. :param sms_message: The version of the message sent to SMS subscribers. :param email_message: The version of the message sent to email subscribers. :return: The ID of the message. """ try: message = { "default": default_message, "sms": sms_message, "email": email_message, } response = topic.publish( Message=json.dumps(message), Subject=subject, MessageStructure="json" ) message_id = response["MessageId"] logger.info("Published multi-format message to topic %s.", topic.arn) except ClientError: logger.exception("Couldn't publish message to topic %s.", topic.arn) raise else: return message_id
  • For API details, see Publish in Amazon SDK for Python (Boto3) API Reference.

Ruby
SDK for Ruby
Note

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

# Service class for sending messages using Amazon Simple Notification Service (SNS) class SnsMessageSender # Initializes the SnsMessageSender with an SNS client # # @param sns_client [Aws::SNS::Client] The SNS client def initialize(sns_client) @sns_client = sns_client @logger = Logger.new($stdout) end # Sends a message to a specified SNS topic # # @param topic_arn [String] The ARN of the SNS topic # @param message [String] The message to send # @return [Boolean] true if message was successfully sent, false otherwise def send_message(topic_arn, message) @sns_client.publish(topic_arn: topic_arn, message: message) @logger.info("Message sent successfully to #{topic_arn}.") true rescue Aws::SNS::Errors::ServiceError => e @logger.error("Error while sending the message: #{e.message}") false end end # Example usage: if $PROGRAM_NAME == __FILE__ topic_arn = "SNS_TOPIC_ARN" # Should be replaced with a real topic ARN message = "MESSAGE" # Should be replaced with the actual message content sns_client = Aws::SNS::Client.new message_sender = SnsMessageSender.new(sns_client) @logger.info("Sending message.") unless message_sender.send_message(topic_arn, message) @logger.error("Message sending failed. Stopping program.") exit 1 end end
Rust
SDK for Rust
Note

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

async fn subscribe_and_publish( client: &Client, topic_arn: &str, email_address: &str, ) -> Result<(), Error> { println!("Receiving on topic with ARN: `{}`", topic_arn); let rsp = client .subscribe() .topic_arn(topic_arn) .protocol("email") .endpoint(email_address) .send() .await?; println!("Added a subscription: {:?}", rsp); let rsp = client .publish() .topic_arn(topic_arn) .message("hello sns!") .send() .await?; println!("Published message: {:?}", rsp); Ok(()) }
  • For API details, see Publish in Amazon SDK for Rust API reference.

SAP ABAP
SDK for SAP ABAP
Note

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

TRY. oo_result = lo_sns->publish( " oo_result is returned for testing purposes. " iv_topicarn = iv_topic_arn iv_message = iv_message ). MESSAGE 'Message published to SNS topic.' TYPE 'I'. CATCH /aws1/cx_snsnotfoundexception. MESSAGE 'Topic does not exist.' TYPE 'E'. ENDTRY.
  • For API details, see Publish in Amazon SDK for SAP ABAP API reference.

For a complete list of Amazon SDK developer guides and code examples, see Using Amazon SNS with an Amazon SDK. This topic also includes information about getting started and details about previous SDK versions.