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|
package quake
import (
"errors"
"net"
"syscall"
"time"
"github.com/osm/quake/common/sequencer"
"github.com/osm/quake/packet"
"github.com/osm/quake/packet/clc"
"github.com/osm/quake/packet/command"
"github.com/osm/quake/packet/command/connect"
"github.com/osm/quake/packet/command/getchallenge"
"github.com/osm/quake/packet/command/ip"
"github.com/osm/quake/packet/svc"
)
func (c *Client) Connect(addrPort string) error {
addr, err := net.ResolveUDPAddr("udp", addrPort)
if err != nil {
return err
}
conn, err := net.DialUDP("udp", nil, addr)
if err != nil {
return err
}
c.conn = conn
c.sendChallenge()
buf := make([]byte, 1024*64)
for {
var isReadTimeout bool
var incomingSeq uint32
var incomingAck uint32
var packet packet.Packet
var cmds []command.Command
if err := c.conn.SetReadDeadline(
time.Now().Add(time.Millisecond * c.readDeadline),
); err != nil {
c.logger.Printf("unable to set read deadline, %v\n", err)
}
n, _, err := c.conn.ReadFromUDP(buf)
if err != nil {
if errors.Is(err, syscall.ECONNREFUSED) {
c.logger.Printf("lost connection - reconnecting in 5 seqonds")
time.Sleep(time.Second * 5)
c.sendChallenge()
continue
}
if err, ok := err.(net.Error); ok && err.Timeout() {
isReadTimeout = true
goto process
}
c.logger.Printf("unexpected read error, %v", err)
continue
}
packet, err = svc.Parse(c.ctx, buf[:n])
if err != nil {
c.logger.Printf("error when parsing server data, %v", err)
continue
}
switch p := packet.(type) {
case *svc.Connectionless:
cmds = []command.Command{p.Command}
case *svc.GameData:
cmds = p.Commands
incomingSeq = p.Seq
incomingAck = p.Ack
}
for _, h := range c.handlers {
cmds = append(cmds, h(packet)...)
}
process:
c.processCommands(incomingSeq, incomingAck, cmds, isReadTimeout)
}
}
func (c *Client) processCommands(
incomingSeq, incomingAck uint32,
serverCmds []command.Command,
isReadTmeout bool,
) {
var cmds []command.Command
for _, serverCmd := range serverCmds {
for _, cmd := range c.handleServerCommand(serverCmd) {
switch cmd := cmd.(type) {
case *connect.Command, *ip.Command:
if _, err := c.conn.Write(
(&clc.Connectionless{Command: cmd}).Bytes(),
); err != nil {
c.logger.Printf("unable to send connectionless command, %v\n", err)
}
default:
cmds = append(cmds, cmd)
}
}
}
if c.seq.GetState() <= sequencer.Handshake {
return
}
c.cmdsMu.Lock()
outSeq, outAck, outCmds, err := c.seq.Process(incomingSeq, incomingAck, append(c.cmds, cmds...))
c.cmds = []command.Command{}
c.cmdsMu.Unlock()
if err == sequencer.ErrRateLimit {
return
}
if _, err := c.conn.Write((&clc.GameData{
Seq: outSeq,
Ack: outAck,
QPort: c.qPort,
Commands: append(outCmds, c.getMove(outSeq)),
}).Bytes()); err != nil {
c.logger.Printf("unable to send game data, %v\n", err)
}
}
func (c *Client) sendChallenge() {
c.seq.Reset()
c.seq.SetState(sequencer.Handshake)
c.readDeadline = connectReadDeadline
if _, err := c.conn.Write(
(&clc.Connectionless{Command: &getchallenge.Command{}}).Bytes(),
); err != nil {
c.logger.Printf("unable to send challenge, %v\n", err)
}
}
|
