106 lines
1.8 KiB
Go
106 lines
1.8 KiB
Go
package udp
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import (
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"fmt"
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"net"
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"sync"
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"time"
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)
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type Server struct {
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conn *net.UDPConn
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connections map[string]*Connection
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mutex sync.RWMutex
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handler PacketHandler
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running bool
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}
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type PacketHandler interface {
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HandlePacket(conn *Connection, packet *ApplicationPacket)
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}
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func NewServer(addr string, handler PacketHandler) (*Server, error) {
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udpAddr, err := net.ResolveUDPAddr("udp", addr)
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if err != nil {
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return nil, err
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}
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conn, err := net.ListenUDP("udp", udpAddr)
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if err != nil {
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return nil, err
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}
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return &Server{
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conn: conn,
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connections: make(map[string]*Connection),
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handler: handler,
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}, nil
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}
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func (s *Server) Start() error {
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s.running = true
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// Start connection timeout checker
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go s.timeoutChecker()
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// Main packet receive loop
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buffer := make([]byte, 2048)
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for s.running {
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n, addr, err := s.conn.ReadFromUDP(buffer)
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if err != nil {
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if s.running {
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fmt.Printf("UDP read error: %v\n", err)
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}
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continue
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}
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go s.handlePacket(buffer[:n], addr)
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}
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return nil
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}
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func (s *Server) Stop() {
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s.running = false
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s.conn.Close()
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}
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func (s *Server) handlePacket(data []byte, addr *net.UDPAddr) {
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if len(data) < 2 {
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return
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}
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connKey := addr.String()
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s.mutex.Lock()
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conn, exists := s.connections[connKey]
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if !exists {
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conn = NewConnection(addr, s.conn, s.handler)
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s.connections[connKey] = conn
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}
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s.mutex.Unlock()
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conn.ProcessPacket(data)
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}
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func (s *Server) timeoutChecker() {
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ticker := time.NewTicker(5 * time.Second)
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defer ticker.Stop()
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for range ticker.C {
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if !s.running {
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return
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}
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now := time.Now()
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s.mutex.Lock()
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for key, conn := range s.connections {
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if now.Sub(conn.lastPacketTime) > 45*time.Second {
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conn.Close()
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delete(s.connections, key)
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}
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}
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s.mutex.Unlock()
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}
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}
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