pztrn
f37dd3adfd
Now we have pooler which will pool connections (like pinging), so there will be no timeouts due to "we have launched 100000 goroutines". Reworked all code to use events (see Eventer). Still more work about this to go. Maybe more fixes I forgot.
136 lines
4.2 KiB
Go
136 lines
4.2 KiB
Go
// 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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"time"
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)
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type Requester struct {
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// Pooler.
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pooler *Pooler
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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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r.pooler = &Pooler{}
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r.pooler.Initialize()
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}
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// Gets all available servers from master server.
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// This isn't in pooler, because it have no need to be pooled.
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func (r *Requester) getServers() {
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// IP addresses we will compose to return.
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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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addr := ip + ":" + port
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// Check if we already have this server added previously. If so - do nothing.
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_, ok := Cache.Servers[addr]
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if !ok {
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// Create cached server.
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Cache.CreateServer(addr)
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Cache.Servers[addr].Server.Ip = ip
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Cache.Servers[addr].Server.Port = port
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}
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}
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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() {
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fmt.Println("Starting all servers updating procedure...")
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r.getServers()
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r.pooler.UpdateServers("all")
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}
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func (r *Requester) UpdateFavoriteServers() {
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fmt.Println("Updating favorites servers...")
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r.pooler.UpdateServers("favorites")
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}
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