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stomp.js
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stomp.js
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module.exports = function (RED) {
'use strict';
const stompit = require('stompit');
const { pipeline: originalPipeline, Writable } = require('stream');
const { promisify } = require('util');
const pipeline = promisify(originalPipeline);
// Stomp Server Node
//
function StompServerNode(n) {
RED.nodes.createNode(this, n);
this.server = n.server;
this.port = n.port;
this.vhost = n.vhost || '/';
this.heartbeat = n.heartbeat;
this.name = n.name;
this.username = this.credentials.user;
this.password = this.credentials.password;
}
RED.nodes.registerType('emu-stomp-server', StompServerNode, {
credentials: {
user: { type: 'text' },
password: { type: 'password' },
},
});
// Stomp IN Node
//
function StompInNode(n) {
RED.nodes.createNode(this, n);
const node = this;
const topic = n.topic;
const encoding = n.encoding;
const serverConfig = RED.nodes.getNode(n.server);
connectClient(this, serverConfig, (client) => {
const subscribeHeaders = {
destination: topic,
ack: 'client-individual',
};
// Subscribe to topic
client.subscribe(subscribeHeaders, (error, message) => {
if (error) {
node.status({ fill: 'red', shape: 'dot', text: 'error' });
node.warn(error);
return;
}
// Create chunkCollector writeable to collect chunks
const chunks = [];
const chunkCollector = new Writable({
write(chunk, encoding, cb) {
chunks.push(chunk);
cb();
},
});
// Create msg processing pipeline
const msgPipeline = pipeline(message, chunkCollector);
// Start pipeline to process message stream and collect chunks
msgPipeline
.then(() => {
// Success - concat msg content and send onwards
let msgContent = Buffer.concat(chunks);
switch (encoding) {
case 'string':
msgContent = msgContent.toString('utf8');
break;
case 'json':
try {
msgContent = JSON.parse(msgContent.toString('utf8'));
} catch (e) {
node.warn('Non-JSON data received');
}
break;
default:
// buffer
break;
}
node.send({ topic, headers: message.headers, payload: msgContent });
client.ack(message);
})
.catch((error) => {
// Pipeline failed
node.status({ fill: 'red', shape: 'dot', text: 'error' });
node.warn(error);
client.ack(message);
});
});
// Disconnect client on node close
node.on('close', function () {
node.log('Disconnecting STOMP client');
client.disconnect();
});
});
}
RED.nodes.registerType('emu-stomp-in', StompInNode);
// Stomp OUT Node
//
function StompOutNode(n) {
RED.nodes.createNode(this, n);
const node = this;
const topic = n.topic;
const encoding = n.encoging;
const serverConfig = RED.nodes.getNode(n.server);
const contentType = encoding === 'json' ? 'application/json' : 'text/plain';
connectClient(this, serverConfig, (client) => {
// Attach input handler after client has connected
node.on('input', function (msg, send, done) {
let payload = msg.payload;
if (typeof payload !== 'string') {
payload = JSON.stringify(payload);
}
const sendHeaders = {
...msg.headers,
destination: topic || msg.topic,
'content-length': payload.length,
};
const frame = client.send(sendHeaders, {
onError: function (error) {
node.status({ fill: 'red', shape: 'dot', text: 'error' });
node.warn(error);
},
});
frame.write(payload);
frame.end();
done && done();
});
// Disconnect client on node close
node.on('close', function (done) {
node.log('Disconnecting STOMP client');
client.disconnect();
done();
});
});
}
RED.nodes.registerType('emu-stomp-out', StompOutNode);
/**
* Connect StompIt client to server
*
* @param {*} node Node-Red node
* @param {*} serverConfig Server configuration node
* @param {*} connectCallback Callback on successful connect
*/
function connectClient(node, serverConfig, connectCallback) {
const connectOptions = {
host: serverConfig.server,
port: +serverConfig.port,
connectHeaders: {
host: serverConfig.vhost,
login: serverConfig.username,
passcode: serverConfig.password,
'heart-beat': serverConfig.heartbeat,
},
};
return stompit.connect(connectOptions, (error, client) => {
if (error) {
node.status({ fill: 'red', shape: 'dot', text: 'error' });
node.warn(error);
} else {
node.status({ fill: 'green', shape: 'dot', text: 'connected' });
node.log('Stomp client connected');
connectCallback(client);
}
});
}
};