149 lines
4.3 KiB
JavaScript
149 lines
4.3 KiB
JavaScript
/*
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* Copyright © 2016-2020 The Thingsboard Authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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'use strict';
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const config = require('config'),
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JsInvokeMessageProcessor = require('../api/jsInvokeMessageProcessor'),
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logger = require('../config/logger')._logger('rabbitmqTemplate');
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const requestTopic = config.get('request_topic');
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const amqp = require('amqplib/callback_api');
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let connection;
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let channel;
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let stopped = false;
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const responseTopics = [];
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function RabbitMqProducer() {
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this.send = async (responseTopic, scriptId, rawResponse, headers) => {
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if (!responseTopics.includes(responseTopic)) {
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await createQueue(responseTopic);
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responseTopics.push(responseTopic);
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}
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let data = JSON.stringify(
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{
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key: scriptId,
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data: [...rawResponse],
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headers: headers
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});
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let dataBuffer = Buffer.from(data);
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channel.sendToQueue(responseTopic, dataBuffer);
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return new Promise((resolve, reject) => {
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channel.waitForConfirms((err) => {
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if (err) {
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reject(err);
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} else {
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resolve();
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}
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});
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});
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}
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}
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(async () => {
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try {
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logger.info('Starting ThingsBoard JavaScript Executor Microservice...');
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amqp.credentials.amqplain('admin', 'password');
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connection = await new Promise((resolve, reject) => {
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amqp.connect('amqp://localhost:5672/', function (err, connection) {
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if (err) {
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reject(err);
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} else {
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resolve(connection);
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}
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});
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});
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channel = await new Promise((resolve, reject) => {
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connection.createConfirmChannel(function (err, channel) {
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if (err) {
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reject(err);
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} else {
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resolve(channel);
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}
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});
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});
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await createQueue(requestTopic);
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const messageProcessor = new JsInvokeMessageProcessor(new RabbitMqProducer());
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while (!stopped) {
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let message = await new Promise((resolve, reject) => {
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channel.get(requestTopic, {}, function (err, msg) {
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if (err) {
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reject(err);
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} else {
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resolve(msg);
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}
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});
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});
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if (message) {
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messageProcessor.onJsInvokeMessage(message.content.toString('utf8'));
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channel.ack(message);
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}
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}
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} catch (e) {
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logger.error('Failed to start ThingsBoard JavaScript Executor Microservice: %s', e.message);
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logger.error(e.stack);
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exit(-1);
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}
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})();
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function createQueue(topic) {
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let params = {durable: false};
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return new Promise((resolve, reject) => {
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channel.assertQueue(topic, params, function (err, data) {
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if (err) {
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reject(err);
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} else {
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resolve();
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}
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});
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});
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}
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process.on('exit', () => {
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exit(0);
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});
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async function exit(status) {
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logger.info('Exiting with status: %d ...', status);
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if (channel) {
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logger.info('Stopping RabbitMq chanel.')
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await channel.close();
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logger.info('RabbitMq chanel is stopped');
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}
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if (connection) {
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logger.info('Stopping RabbitMq connection.')
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try {
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await connection.close();
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logger.info('RabbitMq client is connection.')
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process.exit(status);
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} catch (e) {
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logger.info('RabbitMq connection stop error.');
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process.exit(status);
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}
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} else {
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process.exit(status);
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}
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} |