130 lines
2.7 KiB
Go
130 lines
2.7 KiB
Go
package main
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import (
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"encoding/binary"
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"io"
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"log"
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"net"
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"sync"
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)
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type Server struct {
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*TCPServerMux
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}
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func Listen(address string) (*Server, error) {
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listener, err := net.Listen("tcp", address)
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server := &Server{
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NewTCPServerMux(100),
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}
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if err != nil {
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return nil, err
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}
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go func() {
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for {
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conn, err := listener.Accept()
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if err != nil {
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log.Printf("Error accepting connection: %v\n", err)
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continue
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}
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go server.HandleConnection(conn)
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}
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}()
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return server, nil
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}
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type TCPServerMux struct {
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mu sync.RWMutex
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listeners map[uint16]func(data []byte) error
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functions map[uint16]func(data []byte) (uint16, []byte, error)
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}
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func NewTCPServerMux(maxClients int) *TCPServerMux {
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m := &TCPServerMux{
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mu: sync.RWMutex{},
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listeners: make(map[uint16]func(data []byte) error),
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functions: make(map[uint16]func(data []byte) (uint16, []byte, error)),
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}
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return m
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}
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func (m *TCPServerMux) handleListener(messageType uint16, data []byte) (bool, error) {
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m.mu.RLock()
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handler, ok := m.listeners[messageType]
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m.mu.RUnlock()
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if ok {
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err := handler(data)
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if err != nil {
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return true, err
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}
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}
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return false, nil
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}
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func (m *TCPServerMux) handleFunction(connection net.Conn, messageType uint16, data []byte) (bool, error) {
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m.mu.RLock()
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function, ok := m.functions[messageType]
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m.mu.RUnlock()
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if ok {
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responseType, responseData, err := function(data)
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if err != nil {
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return true, err
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}
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err = binary.Write(connection, binary.LittleEndian, Packet{
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Version: 1,
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MessageType: responseType,
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DataLength: uint16(len(responseData)),
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})
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if err != nil {
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return true, err
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}
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packetsSent.Inc()
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_, err = connection.Write(responseData)
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return true, err
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}
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return false, nil
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}
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func (m *TCPServerMux) HandleConnection(connection net.Conn) error {
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defer connection.Close()
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for {
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messageType, data, err := ReceivePacket(connection)
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if err != nil {
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if err == io.EOF {
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return nil
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}
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log.Printf("Error receiving packet: %v\n", err)
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return err
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}
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status, err := m.handleListener(messageType, data)
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if err != nil {
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log.Printf("Error handling listener: %v\n", err)
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}
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if !status {
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status, err = m.handleFunction(connection, messageType, data)
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if err != nil {
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log.Printf("Error handling function: %v\n", err)
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}
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if !status {
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log.Printf("Unknown message type: %d\n", messageType)
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}
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}
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}
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}
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func (m *TCPServerMux) ListenFor(messageType uint16, handler func(data []byte) error) {
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m.mu.Lock()
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m.listeners[messageType] = handler
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m.mu.Unlock()
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}
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func (m *TCPServerMux) HandleCall(messageType uint16, handler func(data []byte) (uint16, []byte, error)) {
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m.mu.Lock()
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m.functions[messageType] = handler
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m.mu.Unlock()
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}
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