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| 'use strict'; | |
| const debug = require('debug')('network'); | |
| function Networker(socket, handler) { | |
| this.socket = socket; | |
| this._packet = {}; | |
| this._process = false; | |
| this._state = 'HEADER'; | |
| this._payloadLength = 0; | |
| this._bufferedBytes = 0; | |
| this.queue = []; | |
| this.handler = handler; | |
| } | |
| Networker.prototype.init = function () { | |
| this.socket.on('data', (data) => { | |
| this._bufferedBytes += data.length; | |
| this.queue.push(data); | |
| this._process = true; | |
| this._onData(); | |
| }); | |
| this.socket.on('served', this.handler); | |
| }; | |
| Networker.prototype._hasEnough = function (size) { | |
| if (this._bufferedBytes >= size) { | |
| return true; | |
| } | |
| this._process = false; | |
| return false; | |
| } | |
| Networker.prototype._readBytes = function (size) { | |
| let result; | |
| this._bufferedBytes -= size; | |
| if (size === this.queue[0].length) { | |
| return this.queue.shift(); | |
| } | |
| if (size < this.queue[0].length) { | |
| result = this.queue[0].slice(0, size); | |
| this.queue[0] = this.queue[0].slice(size); | |
| return result; | |
| } | |
| result = Buffer.allocUnsafe(size); | |
| let offset = 0; | |
| let length; | |
| while (size > 0) { | |
| length = this.queue[0].length; | |
| if (size >= length) { | |
| this.queue[0].copy(result, offset); | |
| offset += length; | |
| this.queue.shift(); | |
| } else { | |
| this.queue[0].copy(result, offset, 0, size); | |
| this.queue[0] = this.queue[0].slice(size); | |
| } | |
| size -= length; | |
| } | |
| return result; | |
| } | |
| Networker.prototype._getHeader = function () { | |
| if (this._hasEnough(2)) { | |
| this._payloadLength = this._readBytes(2).readUInt16BE(0, true); | |
| this._state = 'PAYLOAD'; | |
| } | |
| } | |
| Networker.prototype._getPayload = function () { | |
| if (this._hasEnough(this._payloadLength)) { | |
| let received = this._readBytes(this._payloadLength); | |
| this.socket.emit('served', received); | |
| this._state = 'HEADER'; | |
| } | |
| } | |
| Networker.prototype._onData = function (data) { | |
| while (this._process) { | |
| switch (this._state) { | |
| case 'HEADER': | |
| this._getHeader(); | |
| break; | |
| case 'PAYLOAD': | |
| this._getPayload(); | |
| break; | |
| } | |
| } | |
| } | |
| Networker.prototype.send = function (message) { | |
| let buffer = Buffer.from(message); | |
| this._header(buffer.length); | |
| this._packet.message = buffer; | |
| this._send(); | |
| } | |
| Networker.prototype._header = function (messageLength) { | |
| this._packet.header = { length: messageLength }; | |
| }; | |
| Networker.prototype._send = function () { | |
| let contentLength = Buffer.allocUnsafe(2); | |
| contentLength.writeUInt16BE(this._packet.header.length); | |
| debug('Attempting to write...', this._packet); | |
| this.socket.write(contentLength); | |
| this.socket.write(this._packet.message); | |
| this._packet = {}; | |
| }; | |
| module.exports = Networker; |
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