// Copyright 2019-2024 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

//

// https://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 sample demonstrates how to perform basic operations on topics 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: Resume Publish

// description: Demonstrates how to resume publishing on an ordering key if

// publishing fails for a message.

// usage: node resumePublish.js <topic-name-or-id> <data>

// [START pubsub_resume_publish_with_ordering_keys]

/**

* TODO(developer): Uncomment these variables before running the sample.

*/

// const topicNameOrId = 'YOUR_TOPIC_NAME_OR_ID';

// const data = JSON.stringify({foo: 'bar'});

// const orderingKey = 'key1';

// 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 resumePublish(topicNameOrId, data, orderingKey) {

// Publishes the message as a string, e.g. "Hello, world!" or JSON.stringify(someObject)

const dataBuffer = Buffer.from(data);

const publishOptions = {

messageOrdering: true,

};

// Cache topic objects (publishers) and reuse them.

//

// Pub/Sub's ordered delivery guarantee only applies when publishes for an ordering

// key are in the same region. For list of locational endpoints for Pub/Sub, see:

// https://cloud.google.com/pubsub/docs/reference/service_apis_overview#list_of_locational_endpoints

const publisher = pubSubClient.topic(topicNameOrId, publishOptions);

// Publishes the message

try {

const message = {

data: dataBuffer,

orderingKey: orderingKey,

};

const messageId = await publisher.publishMessage(message);

console.log(`Message ${messageId} published.`);

return messageId;

} catch (e) {

console.log(`Could not publish: ${e}`);

publisher.resumePublishing(orderingKey);

return null;

}

}

// [END pubsub_resume_publish_with_ordering_keys]

async function main(

topicNameOrId = 'YOUR_TOPIC_NAME_OR_ID',

data = JSON.stringify({foo: 'bar'}),

orderingKey = 'key1',

) {

return await resumePublish(topicNameOrId, data, orderingKey).catch(err => {

console.error(err.message);

process.exitCode = 1;

});

}

// This needs to be exported directly so that the system tests can find it.

module.exports.resumePublishFunc = resumePublish;

if (require.main === module) {

main(...process.argv.slice(2)).catch(console.error);

}