node-gamedig/protocols/openttd.js

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const Core = require('./core');
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class OpenTtd extends Core {
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async run(state) {
{
const [reader, version] = await this.query(0, 1, 1, 4);
if (version >= 4) {
const numGrf = reader.uint(1);
state.raw.grfs = [];
for (let i = 0; i < numGrf; i++) {
const grf = {};
grf.id = reader.part(4).toString('hex');
grf.md5 = reader.part(16).toString('hex');
state.raw.grfs.push(grf);
}
}
if (version >= 3) {
state.raw.date_current = this.readDate(reader);
state.raw.date_start = this.readDate(reader);
}
if (version >= 2) {
state.raw.maxcompanies = reader.uint(1);
state.raw.numcompanies = reader.uint(1);
state.raw.maxspectators = reader.uint(1);
}
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state.name = reader.string();
state.raw.version = reader.string();
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state.raw.language = this.decode(
reader.uint(1),
['any', 'en', 'de', 'fr']
);
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state.password = !!reader.uint(1);
state.maxplayers = reader.uint(1);
state.players.setNum(reader.uint(1));
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state.raw.numspectators = reader.uint(1);
state.map = reader.string();
state.raw.map_width = reader.uint(2);
state.raw.map_height = reader.uint(2);
state.raw.landscape = this.decode(
reader.uint(1),
['temperate', 'arctic', 'desert', 'toyland']
);
state.raw.dedicated = !!reader.uint(1);
}
{
const [reader,version] = await this.query(2,3,-1,-1);
// we don't know how to deal with companies outside version 6
if(version === 6) {
state.raw.companies = [];
const numCompanies = reader.uint(1);
for (let iCompany = 0; iCompany < numCompanies; iCompany++) {
const company = {};
company.id = reader.uint(1);
company.name = reader.string();
company.year_start = reader.uint(4);
company.value = reader.uint(8).toString();
company.money = reader.uint(8).toString();
company.income = reader.uint(8).toString();
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company.performance = reader.uint(2);
company.password = !!reader.uint(1);
const vehicle_types = ['train', 'truck', 'bus', 'aircraft', 'ship'];
const station_types = ['station', 'truckbay', 'busstation', 'airport', 'dock'];
company.vehicles = {};
for (const type of vehicle_types) {
company.vehicles[type] = reader.uint(2);
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}
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company.stations = {};
for (const type of station_types) {
company.stations[type] = reader.uint(2);
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}
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company.clients = reader.string();
state.raw.companies.push(company);
}
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}
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}
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}
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async query(type,expected,minver,maxver) {
const b = Buffer.from([0x03,0x00,type]);
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return await this.udpSend(b,(buffer) => {
const reader = this.reader(buffer);
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const packetLen = reader.uint(2);
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if(packetLen !== buffer.length) {
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this.debugLog('Invalid reported packet length: '+packetLen+' '+buffer.length);
return;
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}
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const packetType = reader.uint(1);
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if(packetType !== expected) {
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this.debugLog('Unexpected response packet type: '+packetType);
return;
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}
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const protocolVersion = reader.uint(1);
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if((minver !== -1 && protocolVersion < minver) || (maxver !== -1 && protocolVersion > maxver)) {
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throw new Error('Unknown protocol version: '+protocolVersion+' Expected: '+minver+'-'+maxver);
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}
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return [reader,protocolVersion];
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});
}
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readDate(reader) {
const daysSinceZero = reader.uint(4);
const temp = new Date(0,0,1);
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temp.setFullYear(0);
temp.setDate(daysSinceZero+1);
return temp.toISOString().split('T')[0];
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}
decode(num,arr) {
if(num < 0 || num >= arr.length) {
return num;
}
return arr[num];
}
}
module.exports = OpenTtd;