node-gamedig/protocols/samp.js

const async = require('async');

class Samp extends require('./core') {
	run(state) {
		async.series([
			(c) => {
				this.sendPacket('i',(reader) => {
					state.password = !!reader.uint(1);
					state.raw.numplayers = reader.uint(2);
					state.maxplayers = reader.uint(2);
					state.name = this.readString(reader,4);
					state.raw.gamemode = this.readString(reader,4);
					this.map = this.readString(reader,4);
					c();
				});
			},
			(c) => {
				this.sendPacket('r',(reader) => {
                    const ruleCount = reader.uint(2);
					state.raw.rules = {};
					for(let i = 0; i < ruleCount; i++) {
                        const key = this.readString(reader,1);
                        const value = this.readString(reader,1);
						state.raw.rules[key] = value;
					}
					if('mapname' in state.raw.rules)
						state.map = state.raw.rules.mapname;
					c();
				});
			},
			(c) => {
				this.sendPacket('d',(reader) => {
                    const playerCount = reader.uint(2);
					for(let i = 0; i < playerCount; i++) {
                        const player = {};
						player.id = reader.uint(1);
						player.name = this.readString(reader,1);
						player.score = reader.int(4);
						player.ping = reader.uint(4);
						state.players.push(player);
					}
					c();
				},() => {
					for(let i = 0; i < state.raw.numplayers; i++) {
						state.players.push({});
					}
					c();
				});
			},
			(c) => {
				this.finish(state);
			}
		]);
	}
	readString(reader,lenBytes) {
        const length = reader.uint(lenBytes);
		if(!length) return '';
        const string = reader.string({length:length});
		return string;
	}
	sendPacket(type,onresponse,ontimeout) {
        const outbuffer = Buffer.alloc(11);
		outbuffer.writeUInt32BE(0x53414D50,0);
        const ipSplit = this.options.address.split('.');
		outbuffer.writeUInt8(parseInt(ipSplit[0]),4);
		outbuffer.writeUInt8(parseInt(ipSplit[1]),5);
		outbuffer.writeUInt8(parseInt(ipSplit[2]),6);
		outbuffer.writeUInt8(parseInt(ipSplit[3]),7);
		outbuffer.writeUInt16LE(this.options.port,8);
		outbuffer.writeUInt8(type.charCodeAt(0),10);

		this.udpSend(outbuffer,(buffer) => {
            const reader = this.reader(buffer);
			for(let i = 0; i < outbuffer.length; i++) {
				if(outbuffer.readUInt8(i) !== reader.uint(1)) return;
			}
			onresponse(reader);
			return true;
		},() => {
			if(ontimeout) {
				ontimeout();
				return true;
			}
		});
	}
}

module.exports = Samp;