Initial commit, what works:
* Servers update * Profile creation/edit/deletion * Game launching * Checks server version <> profile version.
This commit is contained in:
236
requester/requester_object.go
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236
requester/requester_object.go
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// URTator - Urban Terror server browser and game launcher, written in
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// Go.
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//
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// Copyright (c) 2016, Stanslav N. a.k.a pztrn (or p0z1tr0n)
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// All rights reserved.
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//
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// Licensed under Terms and Conditions of GNU General Public License
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// version 3 or any higher.
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// ToDo: put full text of license here.
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package requester
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import (
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// stdlib
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"bytes"
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"fmt"
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"net"
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"strconv"
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"strings"
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"sync"
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"time"
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// local
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"github.com/pztrn/urtrator/datamodels"
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)
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type Requester struct {
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// Master server address
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master_server string
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// Master server port
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master_server_port string
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// Packet prefix.
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pp string
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// Showstopper for delimiting IP addresses.
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// As we are receiving bytes, we will put bytes representation of "\"
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// character.
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ip_delimiter int
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}
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// Requester's initialization.
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func (r *Requester) Initialize() {
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fmt.Println("Initializing Requester...")
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r.master_server = "master.urbanterror.info"
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r.master_server_port = "27900"
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r.pp = "\377\377\377\377"
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r.ip_delimiter = 92
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}
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// Gets all available servers from master server.
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func (r *Requester) getServers(callback chan [][]string) {
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// IP addresses we will compose to return.
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var received_ips [][]string
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conn, err1 := net.Dial("udp", r.master_server + ":" + r.master_server_port)
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if err1 != nil {
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fmt.Println("Error dialing to master server!")
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}
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defer conn.Close()
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// Set deadline, so we won't wait forever.
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ddl := time.Now()
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// This should be enough. Maybe, you should'n run URTrator on modem
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// connections? :)
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ddl = ddl.Add(time.Second * 2)
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conn.SetDeadline(ddl)
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fmt.Println("Master server connection deadline set: " + ddl.String())
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// Request.
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// 68 - protocol version for 4.3
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// 70 - protocol version for 4.2.x
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msg := []byte(r.pp + "getservers 68 full empty")
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conn.Write(msg)
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// UDP Buffer.
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var received_buf []byte = make([]byte, 4096)
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// Received buffer.
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var raw_received []byte
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// Received IP addresses.
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//var received []string
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fmt.Println("Receiving servers list...")
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for {
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_, err := conn.Read(received_buf)
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if err != nil {
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break
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}
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raw_received = append(raw_received, received_buf...)
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fmt.Println("Received " + strconv.Itoa(len(raw_received)) + " bytes")
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}
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// Obtaining list of slices.
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var raw_received_slices [][]byte = bytes.Split(raw_received, []byte("\\"))
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// Every ip-port pair contains:
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// 1. IP as first 4 bytes
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// 2. Port as last 2 bytes.
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// Every package is a 7-bytes sequence, which starts with "\"
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// (code 92), which we used before to obtain list of slices.
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for _, slice := range raw_received_slices {
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// We need only 6-bytes slices. All other aren't represent
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// server's address.
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if len(slice) != 6 {
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continue
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}
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// Generate IP.
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ip := strconv.Itoa(int(slice[0])) + "." + strconv.Itoa(int(slice[1])) + "." + strconv.Itoa(int(slice[2])) + "." + strconv.Itoa(int(slice[3]))
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// Generate port from last two bytes.
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// This is a very shitty thing. Don't do this in real world.
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// Maybe bitshifting will help here, but I can't get it to work :(
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// Get first byte as integer and multiply it on 256 and summing with
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// second byte.
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p1 := int(slice[4]) * 256
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port := strconv.Itoa(p1 + int(slice[5]))
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// Create a slice with IP and port.
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ip_and_port := []string{ip, port}
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// Add it to received_ips.
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received_ips = append(received_ips, ip_and_port)
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}
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fmt.Println("Parsed " + strconv.Itoa(len(received_ips)) + " addresses")
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callback <- received_ips
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}
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// Updates information about all available servers from master server and
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// parses it to usable format.
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func (r *Requester) UpdateAllServers(done_chan chan map[string]*datamodels.Server, error_chan chan bool) {
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fmt.Println("Starting all servers updating procedure...")
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callback := make(chan [][]string)
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go r.getServers(callback)
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servers := make(map[string]*datamodels.Server)
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select {
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case data := <- callback:
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// Yay, we got data! :)
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fmt.Println("Received " + strconv.Itoa(len(data)) + " servers")
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servers = r.updateServerGoroutineDispatcher(data)
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break
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case <- time.After(time.Second * 10):
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// Timeouted? Okay, push error back.
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error_chan <- true
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}
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done_chan <- servers
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}
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func (r *Requester) updateServerGoroutineDispatcher(data [][]string) map[string]*datamodels.Server {
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var wait sync.WaitGroup
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var lock = sync.RWMutex{}
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done_updating := 0
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servers := make(map[string]*datamodels.Server)
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for _, s := range data {
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s := datamodels.Server{
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Ip: s[0],
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Port: s[1],
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}
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go func(s *datamodels.Server, servers map[string]*datamodels.Server) {
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wait.Add(1)
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defer wait.Done()
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r.UpdateServer(s)
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done_updating = done_updating + 1
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lock.Lock()
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servers[s.Ip + ":" + s.Port] = s
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lock.Unlock()
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}(&s, servers)
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}
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wait.Wait()
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return servers
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}
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// Updates information about specific server.
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func (r *Requester) UpdateServer(server *datamodels.Server) {
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srv := server.Ip + ":" + server.Port
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fmt.Println("Updating server: " + srv)
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// Dial to server.
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conn, err1 := net.Dial("udp", srv)
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if err1 != nil {
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fmt.Println("Error dialing to server " + srv + "!")
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}
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defer conn.Close()
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// Set deadline, so we won't wait forever.
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ddl := time.Now()
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// This should be enough. Maybe, you should'n run URTrator on modem
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// connections? :)
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ddl = ddl.Add(time.Second * 2)
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conn.SetDeadline(ddl)
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msg := []byte(r.pp + "getinfo")
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conn.Write(msg)
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// UDP Buffer.
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var received_buf []byte = make([]byte, 4096)
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// Received buffer.
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var raw_received []byte
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for {
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_, err := conn.Read(received_buf)
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if err != nil {
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break
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}
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raw_received = append(raw_received, received_buf...)
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}
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// First line is "infoResponse" string, which we should skip by
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// splitting response by "\n".
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received_lines := strings.Split(string(raw_received), "\n")
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// We have server's data!
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if len(received_lines) > 1 {
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srv_config := strings.Split(received_lines[1], "\\")
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// Parse server configuration into passed server's datamodel.
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for i := 0; i < len(srv_config); i = i + 1 {
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if srv_config[i] == "modversion" {
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server.Version = srv_config[i + 1]
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}
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if srv_config[i] == "gametype" {
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server.Gamemode = srv_config[i + 1]
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}
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if srv_config[i] == "sv_maxclients" {
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server.Maxplayers = srv_config[i + 1]
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}
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if srv_config[i] == "clients" {
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server.Players = srv_config[i + 1]
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}
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if srv_config[i] == "mapname" {
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server.Map = srv_config[i + 1]
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}
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if srv_config[i] == "hostname" {
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server.Name = srv_config[i + 1]
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}
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}
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}
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// ToDo: Calculate ping. 0 for now.
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server.Ping = "0"
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}
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