sample_consumer.js

// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you 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.

const Pulsar = require('pulsar-client');

const auth_params = process.env.AUTH_PARAMS;
const service_url = process.env.SERVICE_URL;

(async () => {
    const auth = new Pulsar.AuthenticationToken({
        token: auth_params,
    });

    // Create a client
    const client = new Pulsar.Client({
        serviceUrl: service_url,
        authentication: auth,
        operationTimeoutSeconds: 30,
    });

    // Create a consumer
    const consumer = await client.subscribe({
        topic: 'persistent://public/default/my-topic',
        subscription: 'sub1',
        subscriptionType: 'Shared',
        ackTimeoutMs: 10000,
    });

    // Receive messages
    for (let i = 0; i < 10; i += 1) {
        const msg = await consumer.receive();
        console.log(msg.getData().toString());
        consumer.acknowledge(msg);
    }

    await consumer.close();
    await client.close();
})();