Pubblicazione di un messaggio Amazon SNS

Pubblicare un messaggio in un argomento.

    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}");
        }
    }

Pubblica un messaggio in un argomento con opzioni di gruppo, duplicazione e attributo.

    /// <summary>
    /// Publish messages using user settings.
    /// </summary>
    /// <returns>Async task.</returns>
    public static async Task PublishMessages()
    {
        Console.WriteLine("Now we can publish messages.");

        var keepSendingMessages = true;
        string? deduplicationId = null;
        string? toneAttribute = null;
        while (keepSendingMessages)
        {
            Console.WriteLine();
            var message = GetUserResponse("Enter a message to publish.", "This is a sample message");

            if (_useFifoTopic)
            {
                Console.WriteLine("Because you are using a FIFO topic, you must set a message group ID." +
                                  "\r\nAll messages within the same group will be received in the order " +
                                  "they were published.");

                Console.WriteLine();
                var messageGroupId = GetUserResponse("Enter a message group ID for this message:", "1");

                if (!_useContentBasedDeduplication)
                {
                    Console.WriteLine("Because you are not using content-based deduplication, " +
                                      "you must enter a deduplication ID.");

                    Console.WriteLine("Enter a deduplication ID for this message.");
                    deduplicationId = GetUserResponse("Enter a deduplication ID for this message.", "1");
                }

                if (GetYesNoResponse("Add an attribute to this message?"))
                {
                    Console.WriteLine("Enter a number for an attribute.");
                    for (int i = 0; i < _tones.Length; i++)
                    {
                        Console.WriteLine($"\t{i + 1}. {_tones[i]}");
                    }

                    var selection = GetUserResponse("", "1");
                    int.TryParse(selection, out var selectionNumber);

                    if (selectionNumber > 0 && selectionNumber < _tones.Length)
                    {
                        toneAttribute = _tones[selectionNumber - 1];
                    }
                }

                var messageID = await SnsWrapper.PublishToTopicWithAttribute(
                    _topicArn, message, "tone", toneAttribute, deduplicationId, messageGroupId);

                Console.WriteLine($"Message published with id {messageID}.");
            }

            keepSendingMessages = GetYesNoResponse("Send another message?", false);
        }
    }

Applica le selezioni dell'utente all'azione di pubblicazione.

    /// <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;
    }

//! 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();
}

Pubblica un messaggio con un attributo.

        static const Aws::String TONE_ATTRIBUTE("tone");
        static const Aws::Vector<Aws::String> TONES = {"cheerful", "funny", "serious",
                                                       "sincere"};

        Aws::Client::ClientConfiguration clientConfig;
        // Optional: Set to the AWS Region (overrides config file).
        // clientConfig.region = "us-east-1";

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

        Aws::SNS::Model::PublishRequest request;
        request.SetTopicArn(topicARN);
        Aws::String message = askQuestion("Enter a message text to publish.  ");
        request.SetMessage(message);

        if (filteringMessages && askYesNoQuestion(
                "Add an attribute to this message? (y/n) ")) {
            for (size_t i = 0; i < TONES.size(); ++i) {
                std::cout << "  " << (i + 1) << ". " << TONES[i] << std::endl;
            }
            int selection = askQuestionForIntRange(
                    "Enter a number for an attribute. ",
                    1, static_cast<int>(TONES.size()));
            Aws::SNS::Model::MessageAttributeValue messageAttributeValue;
            messageAttributeValue.SetDataType("String");
            messageAttributeValue.SetStringValue(TONES[selection - 1]);
            request.AddMessageAttributes(TONE_ATTRIBUTE, messageAttributeValue);
        }

        Aws::SNS::Model::PublishOutcome outcome = snsClient.Publish(request);

        if (outcome.IsSuccess()) {
            std::cout << "Your message was successfully published." << std::endl;
        }
        else {
            std::cerr << "Error with TopicsAndQueues::Publish. "
                      << outcome.GetError().GetMessage()
                      << std::endl;

            cleanUp(topicARN,
                    queueURLS,
                    subscriptionARNS,
                    snsClient,
                    sqsClient);

            return false;
        }

Esempio 1: pubblicazione di un messaggio in un argomento

Nell'esempio publish viene pubblicato il messaggio indicato in un argomento SNS specificato. Il messaggio proviene da un file di testo che consente di includere interruzioni di riga.

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

Contenuto di message.txt.

Hello World
Second Line

Output:

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

Esempio 2: pubblicare un messaggio SMS su un numero di telefono

Nell'esempio publish seguente viene pubblicato il messaggio Hello world! sul numero di telefono+1-555-555-0100.

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

Output:

{
    "MessageId": "123a45b6-7890-12c3-45d6-333322221111"
}

import (
	"context"
	"encoding/json"
	"log"

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

// 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(ctx context.Context, 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(ctx, &publishInput)
	if err != nil {
		log.Printf("Couldn't publish message to topic %v. Here's why: %v", topicArn, err)
	}
	return err
}

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);
        }
    }
}

Creare il client in un modulo separato ed esportarlo.

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({});

Importare l'SDK e i moduli client e chiamare l'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;
};

Pubblica un messaggio in un argomento con opzioni di gruppo, duplicazione e attributo.

  async publishMessages() {
    const message = await this.prompter.input({
      message: MESSAGES.publishMessagePrompt,
    });

    let groupId;
    let deduplicationId;
    let choices;

    if (this.isFifo) {
      await this.logger.log(MESSAGES.groupIdNotice);
      groupId = await this.prompter.input({
        message: MESSAGES.groupIdPrompt,
      });

      if (this.autoDedup === false) {
        await this.logger.log(MESSAGES.deduplicationIdNotice);
        deduplicationId = await this.prompter.input({
          message: MESSAGES.deduplicationIdPrompt,
        });
      }

      choices = await this.prompter.checkbox({
        message: MESSAGES.messageAttributesPrompt,
        choices: toneChoices,
      });
    }

    await this.snsClient.send(
      new PublishCommand({
        TopicArn: this.topicArn,
        Message: message,
        ...(groupId
          ? {
              MessageGroupId: groupId,
            }
          : {}),
        ...(deduplicationId
          ? {
              MessageDeduplicationId: deduplicationId,
            }
          : {}),
        ...(choices
          ? {
              MessageAttributes: {
                tone: {
                  DataType: "String.Array",
                  StringValue: JSON.stringify(choices),
                },
              },
            }
          : {}),
      }),
    );

    const publishAnother = await this.prompter.confirm({
      message: MESSAGES.publishAnother,
    });

    if (publishAnother) {
      await this.publishMessages();
    }
  }

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.")
    }
}

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());
}

Esempio 1: Questo esempio mostra la pubblicazione di un messaggio con una sola riga MessageAttribute dichiarata.

Publish-SNSMessage -TopicArn "arn:aws:sns:us-west-2:123456789012:my-topic" -Message "Hello" -MessageAttribute @{'City'=[Amazon.SimpleNotificationService.Model.MessageAttributeValue]@{DataType='String'; StringValue ='AnyCity'}}

Esempio 2: Questo esempio mostra la pubblicazione di un messaggio con più messaggi MessageAttributes dichiarati in anticipo.

$cityAttributeValue = New-Object Amazon.SimpleNotificationService.Model.MessageAttributeValue
$cityAttributeValue.DataType = "String"
$cityAttributeValue.StringValue = "AnyCity"

$populationAttributeValue = New-Object Amazon.SimpleNotificationService.Model.MessageAttributeValue
$populationAttributeValue.DataType = "Number"
$populationAttributeValue.StringValue = "1250800"

$messageAttributes = New-Object System.Collections.Hashtable
$messageAttributes.Add("City", $cityAttributeValue)
$messageAttributes.Add("Population", $populationAttributeValue)

Publish-SNSMessage -TopicArn "arn:aws:sns:us-west-2:123456789012:my-topic" -Message "Hello" -MessageAttribute $messageAttributes

Pubblicare un messaggio con attributi in modo che una sottoscrizione possa filtrare in base agli attributi.

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

Pubblicare un messaggio che assume forme diverse in base al protocollo del sottoscrittore.

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

# 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

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(())
}

    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.

        let config = try await SNSClient.SNSClientConfiguration(region: region)
        let snsClient = SNSClient(config: config)

        let output = try await snsClient.publish(
            input: PublishInput(
                message: message,
                topicArn: arn
            )
        )

        guard let messageId = output.messageId else {
            print("No message ID received from Amazon SNS.")
            return
        }
        
        print("Published message with ID \(messageId)")