major refactoring :/

tcp-cart-mux-server.go

@@ -0,0 +1,138 @@
+package main
+
+import (
+	"encoding/binary"
+	"io"
+	"log"
+	"net"
+	"sync"
+)
+
+type CartServer struct {
+	*TCPCartServerMux
+}
+
+func CartListen(address string) (*CartServer, error) {
+	listener, err := net.Listen("tcp", address)
+	server := &CartServer{
+		NewCartTCPServerMux(100),
+	}
+
+	if err != nil {
+		return nil, err
+	}
+	go func() {
+		for {
+			conn, err := listener.Accept()
+			if err != nil {
+				log.Printf("Error accepting connection: %v\n", err)
+				continue
+			}
+			go server.HandleConnection(conn)
+		}
+	}()
+	return server, nil
+}
+
+type TCPCartServerMux struct {
+	mu        sync.RWMutex
+	listeners map[uint16]func(CartId, []byte) error
+	functions map[uint16]func(CartId, []byte) (uint16, []byte, error)
+}
+
+func NewCartTCPServerMux(maxClients int) *TCPCartServerMux {
+	m := &TCPCartServerMux{
+		mu:        sync.RWMutex{},
+		listeners: make(map[uint16]func(CartId, []byte) error),
+		functions: make(map[uint16]func(CartId, []byte) (uint16, []byte, error)),
+	}
+
+	return m
+}
+
+func (m *TCPCartServerMux) handleListener(messageType uint16, id CartId, data []byte) (bool, error) {
+	m.mu.RLock()
+	handler, ok := m.listeners[messageType]
+	m.mu.RUnlock()
+	if ok {
+		err := handler(id, data)
+		if err != nil {
+			return true, err
+		}
+	}
+	return false, nil
+}
+
+func (m *TCPCartServerMux) handleFunction(connection net.Conn, messageType uint16, id CartId, data []byte) (bool, error) {
+	m.mu.RLock()
+	function, ok := m.functions[messageType]
+	m.mu.RUnlock()
+	if ok {
+		responseType, responseData, err := function(id, data)
+		if err != nil {
+			return true, err
+		}
+		err = binary.Write(connection, binary.LittleEndian, CartPacket{
+			Version:     1,
+			MessageType: responseType,
+			DataLength:  uint16(len(responseData)),
+			Id:          id,
+		})
+		if err != nil {
+			return true, err
+		}
+		packetsSent.Inc()
+		_, err = connection.Write(responseData)
+		return true, err
+	}
+	return false, nil
+}
+
+func (m *TCPCartServerMux) HandleConnection(connection net.Conn) error {
+	var packet *CartPacket
+	var err error
+	defer connection.Close()
+	for {
+		err = ReadPacket(connection, packet)
+		if err != nil {
+			if err == io.EOF {
+				return nil
+			}
+			log.Printf("Error receiving packet: %v\n", err)
+			return err
+		}
+		if packet == nil {
+			log.Println("Packet is nil")
+			continue
+		}
+		data, err := GetPacketData(connection, int(packet.DataLength))
+		if err != nil {
+			log.Printf("Error getting packet data: %v\n", err)
+		}
+		status, err := m.handleListener(packet.MessageType, packet.Id, data)
+		if err != nil {
+			log.Printf("Error handling listener: %v\n", err)
+		}
+		if !status {
+			status, err = m.handleFunction(connection, packet.MessageType, packet.Id, data)
+			if err != nil {
+				log.Printf("Error handling function: %v\n", err)
+			}
+			if !status {
+				log.Printf("Unknown message type: %d\n", packet.MessageType)
+			}
+		}
+	}
+}
+
+func (m *TCPCartServerMux) ListenFor(messageType uint16, handler func(CartId, []byte) error) {
+	m.mu.Lock()
+	m.listeners[messageType] = handler
+	m.mu.Unlock()
+}
+
+func (m *TCPCartServerMux) HandleCall(messageType uint16, handler func(CartId, []byte) (uint16, []byte, error)) {
+	m.mu.Lock()
+	m.functions[messageType] = handler
+	m.mu.Unlock()
+}