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index.js
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index.js
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const EventEmitter = require('events').EventEmitter;
const amqplib = require('amqplib');
const uuid = require('uuid');
class setuReceiverService extends EventEmitter {
constructor(options) {
super();
//check for release mode
if (options.wait == true) {
//if release mode is enable in this case sender service will wait
this._waitConnection(options)
} else {
//if release mode is disable in this case sender service will not wait
this._simpleConnection(options)
}
}
async _waitConnection(options) {
try {
const rabbitConn = await amqplib.connect(options.uri);
let channel = await rabbitConn.createChannel();
// Add event listeners to the channel
channel.on('close', (err) => {
this.emit('close', err);
});
channel.on('error', (err) => {
this.emit('error', err);
});
if (options.durable !== undefined) {
await channel.assertQueue(`wait-${options.serviceName}`, {
durable: options.durable
});
} else {
await channel.assertQueue(`wait-${options.serviceName}`);
}
if (options.prefetch !== undefined) {
channel.prefetch(options.prefetch);
}
this.emit('connect', "connected");
channel.consume(`wait-${options.serviceName}`, async (data) => {
this.emit('start', data.content.toString(), function (responseData = '', queueData = data) {
channel.sendToQueue(queueData.properties.replyTo, Buffer.from(responseData.toString()), {
correlationId: queueData.properties.correlationId
});
channel.ack(queueData);
});
});
} catch (error) {
this.emit('error', error);
}
}
async _simpleConnection(options) {
try {
const rabbitConn = await amqplib.connect(options.uri);
let channel = await rabbitConn.createChannel();
// Add event listeners to the channel
channel.on('close', (err) => {
this.emit('close', err);
});
channel.on('error', (err) => {
this.emit('error', err);
});
if (options.durable !== undefined) {
await channel.assertQueue(options.serviceName, {
durable: options.durable
});
} else {
await channel.assertQueue(options.serviceName);
}
if (options.prefetch !== undefined) {
channel.prefetch(options.prefetch);
}
this.emit('connect', "connected");
channel.consume(options.serviceName, async (data) => {
this.emit('start', data.content.toString(), function (queueData = data) {
channel.ack(data);
});
});
} catch (error) {
this.emit('error', error);
}
}
}
class setuSenderService {
connect(options) {
return new Promise(async (resolve, reject) => {
try {
const rabbitConn = await amqplib.connect(options.uri);
this.channel = await rabbitConn.createChannel();
resolve(this);
} catch (error) {
reject(error);
}
})
}
assertQueue(channel, options) {
return new Promise(async (resolve, reject) => {
try {
await this.channel.assertQueue(channel, options);
resolve(this);
} catch (error) {
reject(error);
}
})
}
sendToQueue(channel, message, option) {
return new Promise(async (resolve, reject) => {
try {
if (option && option.wait && option.wait == true) {
let waitQueue = await this.channel.assertQueue('', {
durable: false
});
let correlationId = uuid.v4();
this.channel.consume(waitQueue.queue, function (msg) {
if (msg.properties.correlationId == correlationId) {
return resolve(msg.content.toString())
}
}, {
noAck: true
});
const sendToQueueOption = {
correlationId: correlationId,
replyTo: waitQueue.queue
};
if (option.persistent !== undefined) {
sendToQueueOption.persistent = option.persistent;
}
this.channel.sendToQueue(`wait-${channel}`, Buffer.from(message.toString()), sendToQueueOption);
} else {
if (option && option.persistent !== undefined) {
this.channel.sendToQueue(channel, Buffer.from(message.toString()), {
persistent: option.persistent
});
} else {
this.channel.sendToQueue(channel, Buffer.from(message.toString()));
}
resolve('sent');
}
} catch (error) {
reject(error)
}
})
}
}
module.exports.setuReceiverService = setuReceiverService
module.exports.setuSenderService = setuSenderService