node-gamedig/protocols/openttd.js

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import Core from './core.js'
export default class openttd extends Core {
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)
}
state.name = reader.string()
state.raw.version = reader.string()
state.raw.language = this.decode(
reader.uint(1),
['any', 'en', 'de', 'fr']
)
state.password = !!reader.uint(1)
state.maxplayers = reader.uint(1)
state.numplayers = reader.uint(1)
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()
company.performance = reader.uint(2)
company.password = !!reader.uint(1)
const vehicleTypes = ['train', 'truck', 'bus', 'aircraft', 'ship']
const stationTypes = ['station', 'truckbay', 'busstation', 'airport', 'dock']
company.vehicles = {}
for (const type of vehicleTypes) {
company.vehicles[type] = reader.uint(2)
}
company.stations = {}
for (const type of stationTypes) {
company.stations[type] = reader.uint(2)
}
company.clients = reader.string()
state.raw.companies.push(company)
}
}
}
}
async query (type, expected, minver, maxver) {
const b = Buffer.from([0x03, 0x00, type])
return await this.udpSend(b, (buffer) => {
const reader = this.reader(buffer)
const packetLen = reader.uint(2)
if (packetLen !== buffer.length) {
this.logger.debug('Invalid reported packet length: ' + packetLen + ' ' + buffer.length)
return
}
const packetType = reader.uint(1)
if (packetType !== expected) {
this.logger.debug('Unexpected response packet type: ' + packetType)
return
}
const protocolVersion = reader.uint(1)
if ((minver !== -1 && protocolVersion < minver) || (maxver !== -1 && protocolVersion > maxver)) {
throw new Error('Unknown protocol version: ' + protocolVersion + ' Expected: ' + minver + '-' + maxver)
}
return [reader, protocolVersion]
})
}
readDate (reader) {
const daysSinceZero = reader.uint(4)
const temp = new Date(0, 0, 1)
temp.setFullYear(0)
temp.setDate(daysSinceZero + 1)
return temp.toISOString().split('T')[0]
}
decode (num, arr) {
if (num < 0 || num >= arr.length) {
return num
}
return arr[num]
}
}