createSubscriptionWithExactlyOnceDelivery.js

// Copyright 2022 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

// This is a generated sample, using the typeless sample bot. Please
// look for the source TypeScript sample (.ts) for modifications.
'use strict';

/**
 * This application demonstrates how to perform basic operations on
 * schemas with the Google Cloud Pub/Sub API.
 *
 * For more information, see the README.md under /pubsub and the documentation
 * at https://cloud.google.com/pubsub/docs.
 */

// sample-metadata:
//   title: Create an exactly-once delivery subscription
//   description: Demonstrates how to create a subscription for exactly-once delivery.
//   usage: node createSubscriptionWithExactlyOnceDelivery.js <topic-name-or-id> <subscription-name-or-id>

// [START pubsub_create_subscription_with_exactly_once_delivery]
/**
 * TODO(developer): Uncomment these variables before running the sample.
 */
// const topicNameOrId = 'YOUR_TOPIC_NAME_OR_ID';
// const subscriptionNameOrId = 'YOUR_SUBSCRIPTION_NAME_OR_ID';

// Imports the Google Cloud client library
const {PubSub} = require('@google-cloud/pubsub');

// Creates a client; cache this for further use
const pubSubClient = new PubSub();

async function createSubscriptionWithExactlyOnceDelivery(
  topicNameOrId,
  subscriptionNameOrId
) {
  // Creates a new subscription
  await pubSubClient
    .topic(topicNameOrId)
    .createSubscription(subscriptionNameOrId, {
      enableExactlyOnceDelivery: true,
    });
  console.log(
    `Created subscription ${subscriptionNameOrId} with exactly-once delivery.`
  );
  console.log(
    'To process messages, remember to check the return value of ackWithResponse().'
  );
}
// [END pubsub_create_subscription_with_exactly_once_delivery]

function main(
  topicNameOrId = 'YOUR_TOPIC_NAME_OR_ID',
  subscriptionNameOrId = 'YOUR_SUBSCRIPTION_NAME_OR_ID'
) {
  createSubscriptionWithExactlyOnceDelivery(
    topicNameOrId,
    subscriptionNameOrId
  ).catch(err => {
    console.error(err.message);
    process.exitCode = 1;
  });
}

main(...process.argv.slice(2));