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Client.js
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Client.js
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const net = require('net');
const EventEmitter = require('events').EventEmitter;
const Request = require('./protocol/Request');
const Response = require('./protocol/Response');
const PacketStreamWrapper = require('./PacketStreamWrapper');
class Client extends EventEmitter {
constructor() {
super();
this.socket = null;
this.ps = null;
this.correlationId = 0;
}
connect(options, callback) {
if(callback) this.once('connect', callback);
this.socket = net.createConnection(options, () => {
this.ps = new PacketStreamWrapper(this.socket);
this.ps.on('packet', (buff) => this.onpacket(buff));
this.emit('connect');
});
this.socket.on('error', (err) => this.onerror(err));
this.socket.once('end', () => this.onend());
this.socket.once('close', () => this.onclose());
}
onpacket(buffer) {
this.emit('response', buffer);
}
onerror(err) {
this.emit('error', err);
}
onend() {
this.emit('end');
}
onclose() {
this.socket.removeListener('error', this.onerror);
this.socket.removeListener('end', this.onend);
this.socket = null;
if (this.ps) {
this.ps.removeListener('packet', this.onpacket);
this.ps = null;
}
this.emit('close');
}
write(buffer) {
this.ps.write(buffer);
}
send(apiKey, apiVersion, payload, callback) {
const correlationId = ++this.correlationId;
payload.correlation_id = correlationId;
// const onend = () => {
// callback('Broker disconnected', null);
// }
const onpacket = (buffer) => {
this.ps.removeListener('packet', onpacket);
// this.socket.removeListener('end', onend);
const respCorrelationId = buffer.readInt32BE(0);
if (correlationId === respCorrelationId) {
const response = new Response(buffer, apiKey, apiVersion);
//@TODO see what to do with correlation id in response parser
response.offset = 4;
const data = response.read();
callback(null, data);
}
};
// this.socket.once('end', onend);
this.ps.on('packet', onpacket);
const buffer = Request.createBuffer(apiKey, apiVersion, correlationId, payload);
this.write(buffer);
}
close() {
this.socket.destroy();
}
}
module.exports = Client;