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package server
import (
"context"
"errors"
"fmt"
"log"
"net"
"sync"
"time"
"github.com/kyren223/eko/internal/packet"
"github.com/kyren223/eko/pkg/assert"
)
func handleConnection(conn net.Conn, wg *sync.WaitGroup) {
log.Println("accepted client:", conn.RemoteAddr().String())
defer log.Println("disconnected client:", conn.RemoteAddr().String())
defer conn.Close()
defer wg.Done()
ctx, cancel := context.WithTimeout(context.Background(), 2*time.Second)
defer cancel()
out, outErr := packet.RunFramer(ctx, conn)
log.Printf("client %v: running framer\n", conn.RemoteAddr().String())
outer:
for {
select {
case packet := <-out:
log.Printf("client %v: request packet: %v\n", conn.RemoteAddr().String(), packet)
responsePacket, err := handlePacket(packet)
log.Printf("client %v: response packet: %v\n", conn.RemoteAddr().String(), responsePacket)
if err != nil {
log.Printf("client %v: error processing request: %v\n", conn.RemoteAddr().String(), err)
break outer
}
err = responsePacket.Into(conn)
if err != nil {
log.Printf("client %v: error writing packet: %v\n", conn.RemoteAddr().String(), err)
break outer
}
case err := <-outErr:
if err == packet.PacketUnsupportedEncoding {
err := unsupportedEncodingErrorPacket.Into(conn)
log.Printf("client %v: error writing unsupported encoding packet: %v\n", conn.RemoteAddr().String(), err)
} else if err == packet.PacketUnsupportedType {
err := unsupportedTypeErrorPacket.Into(conn)
log.Printf("client %v: error writing unsupported type packet: %v\n", conn.RemoteAddr().String(), err)
} else {
log.Printf("client %v: internal error: %v\n", conn.RemoteAddr().String(), err)
}
break outer
case <-ctx.Done():
log.Printf("client %v: %v\n", conn.RemoteAddr().String(), ctx.Err())
break outer
}
}
}
func handlePacket(pkt packet.Packet) (packet.Packet, error) {
switch pkt.Type() {
case packet.TypeEko:
var request packet.EkoMessage
if err := pkt.DecodePayload(&request); err != nil {
return packet.Packet{}, fmt.Errorf("decode error: %v", err)
}
response := packet.EkoMessage{Message: "Eko \"" + request.Message + "\""}
encoder, err := packet.NewMsgPackEncoder(&response)
if err != nil {
return packet.Packet{}, fmt.Errorf("encode error: %v", err)
}
return packet.NewPacket(encoder), nil
case packet.TypeError:
return packet.Packet{}, errors.New("TODO: not implemented yet")
default:
assert.Unreachable("type should be checked for validity before handler, packet = %v", pkt.String())
return packet.Packet{}, nil
}
}
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