more protocol/service refactor

- removed protocol.Event: CNPeers now send protocol.PacketEvents
- peer uData is held in CNPeer, use SetUserData() and UserData() to
set/read it
- Service.PacketHandler calback has changed, removed uData:
switched calls to peer.SetUserData() and peer.UserData() where appropriate
- service.Service lots of tidying up, removed dependence on old
protocol.Event.
- service.Service && protocol.CNPeer now accept a cancelable context.
hooray graceful shutdowns and unit tests!
- general cleanup

cmd/login.go

@@ -31,7 +31,7 @@ func (s *loginCommand) SetFlags(f *flag.FlagSet) {
 }
 
 func (s *loginCommand) Execute(ctx context.Context, f *flag.FlagSet, _ ...interface{}) subcommands.ExitStatus {
-	loginServer, err := login.NewLoginServer(dbHndlr, redisHndlr, s.port)
+	loginServer, err := login.NewLoginServer(ctx, dbHndlr, redisHndlr, s.port)
 	if err != nil {
 		log.Panicf("failed to create shard server: %v", err)
 	}

cmd/shard.go

@@ -31,7 +31,7 @@ func (s *shardCommand) SetFlags(f *flag.FlagSet) {
 }
 
 func (s *shardCommand) Execute(ctx context.Context, f *flag.FlagSet, _ ...interface{}) subcommands.ExitStatus {
-	shardServer, err := shard.NewShardServer(dbHndlr, redisHndlr, s.port)
+	shardServer, err := shard.NewShardServer(ctx, dbHndlr, redisHndlr, s.port)
 	if err != nil {
 		log.Panicf("failed to create shard server: %v", err)
 	}

internal/protocol/cnpeer.go

@@ -1,10 +1,11 @@
 package protocol
 
 import (
+	"bytes"
+	"context"
 	"encoding/binary"
 	"fmt"
 	"io"
-	"log"
 	"net"
 	"sync/atomic"
 	"time"
@@ -15,9 +16,17 @@ const (
 	USE_FE
 )
 
+type PacketEvent struct {
+	Type  int
+	Pkt   *bytes.Buffer
+	PktID uint32
+}
+
 // CNPeer is a simple wrapper for net.Conn connections to send/recv packets over the Fusionfall packet protocol.
 type CNPeer struct {
+	uData    interface{}
 	conn     net.Conn
+	ctx      context.Context
 	whichKey int
 	alive    *atomic.Bool
 
@@ -32,9 +41,10 @@ func GetTime() uint64 {
 	return uint64(time.Now().UnixMilli())
 }
 
-func NewCNPeer(conn net.Conn) *CNPeer {
+func NewCNPeer(ctx context.Context, conn net.Conn) *CNPeer {
 	p := &CNPeer{
 		conn:     conn,
+		ctx:      ctx,
 		whichKey: USE_E,
 		alive:    &atomic.Bool{},
 
@@ -45,6 +55,14 @@ func NewCNPeer(conn net.Conn) *CNPeer {
 	return p
 }
 
+func (peer *CNPeer) SetUserData(uData interface{}) {
+	peer.uData = uData
+}
+
+func (peer *CNPeer) UserData() interface{} {
+	return peer.uData
+}
+
 func (peer *CNPeer) Send(typeID uint32, data ...interface{}) error {
 	// grab buffer from pool
 	buf := GetBuffer()
@@ -82,7 +100,7 @@ func (peer *CNPeer) Send(typeID uint32, data ...interface{}) error {
 	EncryptData(buf.Bytes()[4:], key)
 
 	// send full packet
-	log.Printf("Sending %#v, sizeof: %d, buffer: %v", data, buf.Len(), buf.Bytes())
+	// log.Printf("Sending %#v, sizeof: %d, buffer: %v", data, buf.Len(), buf.Bytes())
 	if _, err := peer.conn.Write(buf.Bytes()); err != nil {
 		return fmt.Errorf("failed to write packet body! %v", err)
 	}
@@ -99,21 +117,22 @@ func (peer *CNPeer) Kill() {
 		return
 	}
 
-	log.Printf("Killing peer %p", peer)
 	peer.conn.Close()
 }
 
 // meant to be invoked as a goroutine
-func (peer *CNPeer) Handler(eRecv chan<- *Event) error {
+func (peer *CNPeer) Handler(eRecv chan<- *PacketEvent) error {
 	defer func() {
-		eRecv <- &Event{Type: EVENT_CLIENT_DISCONNECT, Peer: peer}
 		close(eRecv)
 		peer.Kill()
 	}()
 
 	peer.alive.Store(true)
-	eRecv <- &Event{Type: EVENT_CLIENT_CONNECT, Peer: peer}
 	for {
+		select {
+		case <-peer.ctx.Done():
+			return nil
+		default:
 			// read packet size, the goroutine spends most of it's time parked here
 			var sz uint32
 			if err := binary.Read(peer.conn, binary.LittleEndian, &sz); err != nil {
@@ -143,6 +162,7 @@ func (peer *CNPeer) Handler(eRecv chan<- *Event) error {
 
 			// dispatch packet
 			// log.Printf("Got packet ID: %x, with a sizeof: %d\n", pktID, sz)
-		eRecv <- &Event{Type: EVENT_CLIENT_PACKET, Peer: peer, Pkt: buf, PktID: pktID}
+			eRecv <- &PacketEvent{Pkt: buf, PktID: pktID}
+		}
 	}
 }

internal/protocol/event.go

@@ -1,16 +0,0 @@
-package protocol
-
-import "bytes"
-
-const (
-	EVENT_CLIENT_DISCONNECT = iota
-	EVENT_CLIENT_CONNECT
-	EVENT_CLIENT_PACKET
-)
-
-type Event struct {
-	Type  int
-	Peer  *CNPeer
-	Pkt   *bytes.Buffer
-	PktID uint32
-}

internal/service/service.go

@@ -1,6 +1,7 @@
 package service
 
 import (
+	"context"
 	"errors"
 	"fmt"
 	"log"
@@ -13,9 +14,9 @@ import (
 	"github.com/CPunch/gopenfusion/internal/protocol"
 )
 
-type PacketHandler func(peer *protocol.CNPeer, uData interface{}, pkt protocol.Packet) error
+type PacketHandler func(peer *protocol.CNPeer, pkt protocol.Packet) error
 
-func StubbedPacket(_ *protocol.CNPeer, _ interface{}, _ protocol.Packet) error {
+func StubbedPacket(_ *protocol.CNPeer, _ protocol.Packet) error {
 	return nil
 }
 
@@ -23,22 +24,22 @@ type Service struct {
 	listener       net.Listener
 	port           int
 	Name           string
-	stop           chan struct{} // tell active handleEvents() to stop
+	ctx            context.Context
-	stopped        chan struct{}
 	started        chan struct{}
+	stopped        chan struct{}
 	packetHandlers map[uint32]PacketHandler
-	peers          map[*protocol.CNPeer]interface{}
+	peers          map[chan *protocol.PacketEvent]*protocol.CNPeer
 	stateLock      sync.Mutex
 
 	// OnDisconnect is called when a peer disconnects from the service.
 	// uData is the stored value of the key/value pair in the peer map.
 	// It may not be set while the service is running. (eg. srvc.Start() has been called)
-	OnDisconnect func(peer *protocol.CNPeer, uData interface{})
+	OnDisconnect func(peer *protocol.CNPeer)
 
 	// OnConnect is called when a peer connects to the service.
 	// return value is used as the value in the peer map.
 	// It may not be set while the service is running. (eg. srvc.Start() has been called)
-	OnConnect func(peer *protocol.CNPeer) (uData interface{})
+	OnConnect func(peer *protocol.CNPeer)
 }
 
 func RandomPort() (int, error) {
@@ -55,44 +56,52 @@ func RandomPort() (int, error) {
 	return strconv.Atoi(port)
 }
 
-func NewService(name string, port int) *Service {
+func NewService(ctx context.Context, name string, port int) *Service {
 	srvc := &Service{
 		port: port,
 		Name: name,
 	}
 
-	srvc.Reset()
+	srvc.Reset(ctx)
 	return srvc
 }
 
-func (service *Service) Reset() {
+func (srvc *Service) Reset(ctx context.Context) {
-	service.packetHandlers = make(map[uint32]PacketHandler)
+	srvc.ctx = ctx
-	service.peers = make(map[*protocol.CNPeer]interface{})
+	srvc.packetHandlers = make(map[uint32]PacketHandler)
-	service.started = make(chan struct{})
+	srvc.peers = make(map[chan *protocol.PacketEvent]*protocol.CNPeer)
+	srvc.started = make(chan struct{})
+	srvc.stopped = make(chan struct{})
 }
 
 // may not be called while the service is running (eg. srvc.Start() has been called)
-func (service *Service) AddPacketHandler(pktID uint32, handler PacketHandler) {
+func (srvc *Service) AddPacketHandler(pktID uint32, handler PacketHandler) {
-	service.packetHandlers[pktID] = handler
+	srvc.packetHandlers[pktID] = handler
 }
 
-func (service *Service) Start() error {
+type newPeerConnection struct {
-	service.stop = make(chan struct{})
+	peer    *protocol.CNPeer
-	service.stopped = make(chan struct{})
+	channel chan *protocol.PacketEvent
-	peerConnections := make(chan chan *protocol.Event)
+}
-	go service.handleEvents(peerConnections)
+
+func (srvc *Service) Start() error {
+	peerConnections := make(chan newPeerConnection)
+	defer close(peerConnections)
+	go srvc.handleEvents(peerConnections)
 
 	// open listener socket
 	var err error
-	service.listener, err = net.Listen("tcp", fmt.Sprintf(":%d", service.port))
+	srvc.listener, err = net.Listen("tcp", fmt.Sprintf(":%d", srvc.port))
 	if err != nil {
 		return err
 	}
+	defer srvc.listener.Close()
 
-	close(service.started) // signal that the service has started
+	log.Printf("%s service hosted on %s:%d\n", srvc.Name, config.GetAnnounceIP(), srvc.port)
-	log.Printf("%s service hosted on %s:%d\n", service.Name, config.GetAnnounceIP(), service.port)
+
+	close(srvc.started) // signal that the service has started
 	for {
-		conn, err := service.listener.Accept()
+		conn, err := srvc.listener.Accept()
 		if err != nil {
 			fmt.Println(err)
 			// we expect this to happen when the service is stopped
@@ -103,143 +112,148 @@ func (service *Service) Start() error {
 		}
 
 		// create a new peer and pass it to the event loop
-		eRecv := make(chan *protocol.Event)
+		peer := protocol.NewCNPeer(srvc.ctx, conn)
-		peer := protocol.NewCNPeer(conn)
+		eRecv := make(chan *protocol.PacketEvent)
-		log.Printf("New peer %p connected to %s\n", peer, service.Name)
+		peerConnections <- newPeerConnection{channel: eRecv, peer: peer}
-		peerConnections <- eRecv
 		go peer.Handler(eRecv)
 	}
 }
 
+func (srvc *Service) getPeer(channel chan *protocol.PacketEvent) *protocol.CNPeer {
+	return srvc.peers[channel]
+}
+
+func (srvc *Service) setPeer(channel chan *protocol.PacketEvent, peer *protocol.CNPeer) {
+	srvc.peers[channel] = peer
+}
+
+func (srvc *Service) removePeer(channel chan *protocol.PacketEvent) {
+	delete(srvc.peers, channel)
+}
+
 // returns a channel that is closed when the service has started.
-// this is useful if you need to do something after the service has started.
+// this is useful if you need to wait until after the service has started.
-func (service *Service) Started() <-chan struct{} {
+func (srvc *Service) Started() <-chan struct{} {
-	return service.started
+	return srvc.started
 }
 
 // returns a channel that is closed when the service has stopped.
-// this is useful if you need to wait until the service has completely stopped.
+// this is useful if you need wait until after the service has stopped.
-func (service *Service) Stopped() <-chan struct{} {
+func (srvc *Service) Stopped() <-chan struct{} {
-	return service.stopped
+	return srvc.stopped
-}
-
-// stops the service and disconnects all peers. OnDisconnect will be called
-// for each peer.
-func (service *Service) Stop() {
-	close(service.stop)
-
-	service.listener.Close()
-}
-
-// returns the stored uData for the peer.
-// if the peer does not exist, nil is returned.
-// NOTE: the peer map is not locked while accessing, if you're calling this
-// outside of the service's event loop, you'll need to lock the peer map yourself.
-func (service *Service) GetPeerData(peer *protocol.CNPeer) interface{} {
-	return service.peers[peer]
-}
-
-// sets the stored uData for the peer.
-// NOTE: the peer map is not locked while accessing, if you're calling this
-// outside of the service's event loop, you'll need to lock the peer map yourself.
-func (service *Service) SetPeerData(peer *protocol.CNPeer, uData interface{}) {
-	service.peers[peer] = uData
 }
 
 // calls f for each peer in the service passing the peer and the stored uData.
 // if f returns false, the iteration is stopped.
 // NOTE: the peer map is not locked while iterating, if you're calling this
 // outside of the service's event loop, you'll need to lock the peer map yourself.
-func (service *Service) RangePeers(f func(peer *protocol.CNPeer, uData interface{}) bool) {
+func (srvc *Service) RangePeers(f func(peer *protocol.CNPeer) bool) {
-	for peer, uData := range service.peers {
+	for _, peer := range srvc.peers {
-		if !f(peer, uData) {
+		if !f(peer) {
 			break
 		}
 	}
 }
 
 // locks the peer map.
-func (service *Service) Lock() {
+func (srvc *Service) Lock() {
-	service.stateLock.Lock()
+	srvc.stateLock.Lock()
 }
 
 // unlocks the peer map.
-func (service *Service) Unlock() {
+func (srvc *Service) Unlock() {
-	service.stateLock.Unlock()
+	srvc.stateLock.Unlock()
+}
+
+func (srvc *Service) stop() {
+	// OnDisconnect handler might need to do something important
+	srvc.RangePeers(func(peer *protocol.CNPeer) bool {
+		peer.Kill()
+		if srvc.OnDisconnect != nil {
+			srvc.OnDisconnect(peer)
+		}
+		return true
+	})
+
+	log.Printf("%s service stopped\n", srvc.Name)
+	close(srvc.stopped)
 }
 
 // handleEvents is the main event loop for the service.
 // it handles all events from the peers and calls the appropriate handlers.
-func (service *Service) handleEvents(eRecv <-chan chan *protocol.Event) {
+func (srvc *Service) handleEvents(peerPipe <-chan newPeerConnection) {
+	defer srvc.stop()
+
 	poll := make([]reflect.SelectCase, 0, 4)
 
 	// add the stop channel and the peer connection channel to our poll queue
 	poll = append(poll, reflect.SelectCase{
 		Dir:  reflect.SelectRecv,
-		Chan: reflect.ValueOf(service.stop),
+		Chan: reflect.ValueOf(srvc.ctx.Done()),
 	})
 	poll = append(poll, reflect.SelectCase{
 		Dir:  reflect.SelectRecv,
-		Chan: reflect.ValueOf(eRecv),
+		Chan: reflect.ValueOf(peerPipe),
 	})
 
+	addPoll := func(channel chan *protocol.PacketEvent) {
+		poll = append(poll, reflect.SelectCase{
+			Dir:  reflect.SelectRecv,
+			Chan: reflect.ValueOf(channel),
+		})
+	}
+
+	removePoll := func(index int) {
+		poll = append(poll[:index], poll[index+1:]...)
+	}
+
 	for {
-		chosen, value, _ := reflect.Select(poll)
+		chosen, value, recvOK := reflect.Select(poll)
-		if chosen == 0 {
+		switch chosen {
-			// stop
+		case 0: // cancel signal received, stop the service
-
+			return
-			// OnDisconnect handler might need to do something important
+		case 1: // new peer, add it to our poll queue
-			service.Lock()
+			if !recvOK {
-			service.RangePeers(func(peer *protocol.CNPeer, uData interface{}) bool {
-				peer.Kill()
-				service.disconnect(peer)
-				return true
-			})
-			service.Unlock()
-
-			// signal we have stopped
-			close(service.stopped)
 				return
-		} else if chosen == 1 {
-			// new peer, add it to our poll queue
-			poll = append(poll, reflect.SelectCase{
-				Dir:  reflect.SelectRecv,
-				Chan: reflect.ValueOf(value.Interface()),
-			})
-		} else {
-			// peer event
-			event, ok := value.Interface().(*protocol.Event)
-			if !ok {
-				panic("invalid event type")
 			}
 
-			service.Lock()
+			evnt := value.Interface().(newPeerConnection)
-			switch event.Type {
+			addPoll(evnt.channel)
-			case protocol.EVENT_CLIENT_DISCONNECT:
+			srvc.connect(evnt.channel, evnt.peer)
-				// strip the peer from our poll queue
+		default: // peer event
-				poll = append(poll[:chosen], poll[chosen+1:]...)
+			channel := poll[chosen].Chan.Interface().(chan *protocol.PacketEvent)
-				service.disconnect(value.Interface().(*protocol.Event).Peer)
+			peer := srvc.getPeer(channel)
-			case protocol.EVENT_CLIENT_CONNECT:
+			if peer == nil {
-				service.connect(event.Peer)
+				log.Printf("Unknown peer event: %v", value)
-			case protocol.EVENT_CLIENT_PACKET:
+				removePoll(chosen)
-				if err := service.handlePacket(event.Peer, event.PktID, protocol.NewPacket(event.Pkt)); err != nil {
+				continue
-					log.Printf("Error handling packet: %v", err)
-					event.Peer.Kill()
 			}
 
+			evnt, ok := value.Interface().(*protocol.PacketEvent)
+			if !recvOK || !ok || evnt == nil {
+				// peer disconnected, remove it from our poll queue
+				removePoll(chosen)
+				srvc.disconnect(channel, peer)
+				continue
+			}
+
+			srvc.Lock()
+			if err := srvc.handlePacket(peer, evnt.PktID, protocol.NewPacket(evnt.Pkt)); err != nil {
+				log.Printf("Error handling packet: %v", err)
+				peer.Kill()
+			}
+			srvc.Unlock()
+
 			// the packet buffer is given to us by the event, so we'll need to make sure to return it to the pool
-				protocol.PutBuffer(event.Pkt)
+			protocol.PutBuffer(evnt.Pkt)
-			}
-			service.Unlock()
 		}
 	}
 }
 
-func (service *Service) handlePacket(peer *protocol.CNPeer, typeID uint32, pkt protocol.Packet) error {
+func (srvc *Service) handlePacket(peer *protocol.CNPeer, typeID uint32, pkt protocol.Packet) error {
-	uData := service.peers[peer]
+	if hndlr, ok := srvc.packetHandlers[typeID]; ok {
-	if hndlr, ok := service.packetHandlers[typeID]; ok {
 		// fmt.Printf("Handling packet %x\n", typeID)
-		if err := hndlr(peer, uData, pkt); err != nil {
+		if err := hndlr(peer, pkt); err != nil {
 			return err
 		}
 	} else {
@@ -249,24 +263,20 @@ func (service *Service) handlePacket(peer *protocol.CNPeer, typeID uint32, pkt p
 	return nil
 }
 
-func (service *Service) disconnect(peer *protocol.CNPeer) {
+func (srvc *Service) disconnect(channel chan *protocol.PacketEvent, peer *protocol.CNPeer) {
-	if service.OnDisconnect != nil {
+	log.Printf("Peer %p disconnected from %s\n", peer, srvc.Name)
-		uData := service.peers[peer]
+	if srvc.OnDisconnect != nil {
-		service.OnDisconnect(peer, uData)
+		srvc.OnDisconnect(peer)
 	}
 
-	log.Printf("Peer %p disconnected from %s\n", peer, service.Name)
+	srvc.removePeer(channel)
-	delete(service.peers, peer)
 }
 
-func (service *Service) connect(peer *protocol.CNPeer) {
+func (srvc *Service) connect(channel chan *protocol.PacketEvent, peer *protocol.CNPeer) {
-	// default uData to nil, but if the service has an OnConnect
+	log.Printf("New peer %p connected to %s\n", peer, srvc.Name)
-	// handler, use the result from that
+	if srvc.OnConnect != nil {
-	uData := interface{}(nil)
+		srvc.OnConnect(peer)
-	if service.OnConnect != nil {
-		uData = service.OnConnect(peer)
 	}
 
-	log.Printf("New peer %p connected to %s\n", peer, service.Name)
+	srvc.setPeer(channel, peer)
-	service.SetPeerData(peer, uData)
 }

internal/service/service_test.go

@@ -1,7 +1,9 @@
 package service_test
 
 import (
+	"context"
 	"fmt"
+	"log"
 	"net"
 	"os"
 	"sync"
@@ -13,12 +15,11 @@ import (
 )
 
 var (
-	srvc     *service.Service
 	srvcPort int
 )
 
 const (
-	timeout       = 5
+	timeout       = 2
 	maxDummyPeers = 5
 )
 
@@ -44,15 +45,18 @@ func TestMain(m *testing.M) {
 		panic(err)
 	}
 
-	srvc = service.NewService("TEST", srvcPort)
 	os.Exit(m.Run())
 }
 
 func TestService(t *testing.T) {
+	ctx, cancel := context.WithCancel(context.Background())
+	srvc := service.NewService(ctx, "TEST", srvcPort)
+
 	// waitgroup to wait for test packet handler to be called
 	wg := sync.WaitGroup{}
 
-	srvc.AddPacketHandler(0x1234, func(peer *protocol.CNPeer, uData interface{}, pkt protocol.Packet) error {
+	srvc.AddPacketHandler(0x1234, func(peer *protocol.CNPeer, pkt protocol.Packet) error {
+		log.Printf("Received packet %#v", pkt)
 		wg.Done()
 		return nil
 	})
@@ -65,7 +69,7 @@ func TestService(t *testing.T) {
 
 	// wait for service to start
 	<-srvc.Started()
-	wg.Add(maxDummyPeers)
+	wg.Add(maxDummyPeers * 3) // 2 wg.Done() calls per dummy peer
 	for i := 0; i < maxDummyPeers; i++ {
 		go func() {
 			// make dummy client
@@ -74,18 +78,28 @@ func TestService(t *testing.T) {
 				t.Error(err)
 			}
 
-			peer := protocol.NewCNPeer(conn)
+			peer := protocol.NewCNPeer(ctx, conn)
+			go func() {
 				defer peer.Kill()
-			// send dummy packet
+
+				// send dummy packets
+				for i := 0; i < 2; i++ {
 					if err := peer.Send(0x1234); err != nil {
 						t.Error(err)
 					}
+				}
+			}()
+
+			// we wait until Handler gracefully exits (peer was killed)
+			peer.Handler(make(chan *protocol.PacketEvent))
+			wg.Done()
 		}()
 	}
 
 	if !waitWithTimeout(&wg, timeout) {
-		t.Error("timeout waiting for packet handler to be called")
+		t.Error("failed to wait for packet handler to be called")
 	}
-	srvc.Stop()
+
+	cancel()
 	<-srvc.Stopped()
 }

login/login.go

@@ -61,7 +61,7 @@ func (server *LoginServer) AcceptLogin(peer *protocol.CNPeer, SzID string, IClie
 	return nil
 }
 
-func (server *LoginServer) Login(peer *protocol.CNPeer, _account interface{}, pkt protocol.Packet) error {
+func (server *LoginServer) Login(peer *protocol.CNPeer, pkt protocol.Packet) error {
 	var loginPkt protocol.SP_CL2LS_REQ_LOGIN
 	pkt.Decode(&loginPkt)
 
@@ -73,9 +73,9 @@ func (server *LoginServer) Login(peer *protocol.CNPeer, _account interface{}, pk
 	}
 
 	// client is resending a login packet??
-	if _account != nil {
+	if peer.UserData() != nil {
 		SendError(LOGIN_ERROR)
-		return fmt.Errorf("out of order P_CL2LS_REQ_LOGIN: %v", _account)
+		return fmt.Errorf("out of order P_CL2LS_REQ_LOGIN: %v", peer.UserData())
 	}
 
 	// attempt login
@@ -98,7 +98,7 @@ func (server *LoginServer) Login(peer *protocol.CNPeer, _account interface{}, pk
 	}
 
 	// grab player data
-	server.service.SetPeerData(peer, account)
+	peer.SetUserData(account)
 	plrs, err := server.dbHndlr.GetPlayers(account.AccountID)
 	if err != nil {
 		SendError(LOGIN_DATABASE_ERROR)
@@ -137,7 +137,7 @@ func (server *LoginServer) Login(peer *protocol.CNPeer, _account interface{}, pk
 	return server.AcceptLogin(peer, loginPkt.SzID, loginPkt.IClientVerC, 1, charInfo[:len(plrs)])
 }
 
-func (server *LoginServer) CheckCharacterName(peer *protocol.CNPeer, account interface{}, pkt protocol.Packet) error {
+func (server *LoginServer) CheckCharacterName(peer *protocol.CNPeer, pkt protocol.Packet) error {
 	var charPkt protocol.SP_CL2LS_REQ_CHECK_CHAR_NAME
 	pkt.Decode(&charPkt)
 
@@ -148,17 +148,18 @@ func (server *LoginServer) CheckCharacterName(peer *protocol.CNPeer, account int
 	})
 }
 
-func (server *LoginServer) SaveCharacterName(peer *protocol.CNPeer, account interface{}, pkt protocol.Packet) error {
+func (server *LoginServer) SaveCharacterName(peer *protocol.CNPeer, pkt protocol.Packet) error {
 	var charPkt protocol.SP_CL2LS_REQ_SAVE_CHAR_NAME
 	pkt.Decode(&charPkt)
 
-	if account == nil {
+	account, ok := peer.UserData().(*db.Account)
+	if !ok || account == nil {
 		peer.Send(protocol.P_LS2CL_REP_SAVE_CHAR_NAME_FAIL, protocol.SP_LS2CL_REP_SAVE_CHAR_NAME_FAIL{})
 		return fmt.Errorf("out of order P_LS2CL_REP_SAVE_CHAR_NAME_FAIL")
 	}
 
 	// TODO: sanity check SzFirstName && SzLastName
-	PlayerID, err := server.dbHndlr.NewPlayer(account.(*db.Account).AccountID, charPkt.SzFirstName, charPkt.SzLastName, int(charPkt.ISlotNum))
+	PlayerID, err := server.dbHndlr.NewPlayer(account.AccountID, charPkt.SzFirstName, charPkt.SzLastName, int(charPkt.ISlotNum))
 	if err != nil {
 		peer.Send(protocol.P_LS2CL_REP_SAVE_CHAR_NAME_FAIL, protocol.SP_LS2CL_REP_SAVE_CHAR_NAME_FAIL{})
 		return err
@@ -210,11 +211,12 @@ func SendFail(peer *protocol.CNPeer) error {
 	return nil
 }
 
-func (server *LoginServer) CharacterCreate(peer *protocol.CNPeer, account interface{}, pkt protocol.Packet) error {
+func (server *LoginServer) CharacterCreate(peer *protocol.CNPeer, pkt protocol.Packet) error {
 	var charPkt protocol.SP_CL2LS_REQ_CHAR_CREATE
 	pkt.Decode(&charPkt)
 
-	if account == nil {
+	account, ok := peer.UserData().(*db.Account)
+	if !ok || account == nil {
 		return SendFail(peer)
 	}
 
@@ -223,7 +225,7 @@ func (server *LoginServer) CharacterCreate(peer *protocol.CNPeer, account interf
 		return SendFail(peer)
 	}
 
-	if err := server.dbHndlr.FinishPlayer(&charPkt, account.(*db.Account).AccountID); err != nil {
+	if err := server.dbHndlr.FinishPlayer(&charPkt, account.AccountID); err != nil {
 		log.Printf("Error finishing player: %v", err)
 		return SendFail(peer)
 	}
@@ -242,15 +244,16 @@ func (server *LoginServer) CharacterCreate(peer *protocol.CNPeer, account interf
 	})
 }
 
-func (server *LoginServer) CharacterDelete(peer *protocol.CNPeer, account interface{}, pkt protocol.Packet) error {
+func (server *LoginServer) CharacterDelete(peer *protocol.CNPeer, pkt protocol.Packet) error {
 	var charPkt protocol.SP_CL2LS_REQ_CHAR_DELETE
 	pkt.Decode(&charPkt)
 
-	if account == nil {
+	account, ok := peer.UserData().(*db.Account)
+	if !ok || account == nil {
 		return SendFail(peer)
 	}
 
-	slot, err := server.dbHndlr.DeletePlayer(int(charPkt.IPC_UID), account.(*db.Account).AccountID)
+	slot, err := server.dbHndlr.DeletePlayer(int(charPkt.IPC_UID), account.AccountID)
 	if err != nil {
 		return SendFail(peer)
 	}
@@ -260,11 +263,12 @@ func (server *LoginServer) CharacterDelete(peer *protocol.CNPeer, account interf
 	})
 }
 
-func (server *LoginServer) ShardSelect(peer *protocol.CNPeer, account interface{}, pkt protocol.Packet) error {
+func (server *LoginServer) ShardSelect(peer *protocol.CNPeer, pkt protocol.Packet) error {
 	var selection protocol.SP_CL2LS_REQ_CHAR_SELECT
 	pkt.Decode(&selection)
 
-	if account == nil {
+	account, ok := peer.UserData().(*db.Account)
+	if !ok || account == nil {
 		return SendFail(peer)
 	}
 
@@ -289,7 +293,7 @@ func (server *LoginServer) ShardSelect(peer *protocol.CNPeer, account interface{
 		log.Printf("Error getting player: %v", err)
 		return SendFail(peer)
 	}
-	accountID := account.(*db.Account).AccountID
+	accountID := account.AccountID
 
 	if plr.AccountID != accountID {
 		log.Printf("HACK: player %d tried to join shard as player %d", accountID, plr.AccountID)
@@ -315,15 +319,16 @@ func (server *LoginServer) ShardSelect(peer *protocol.CNPeer, account interface{
 	return peer.Send(protocol.P_LS2CL_REP_SHARD_SELECT_SUCC, resp)
 }
 
-func (server *LoginServer) FinishTutorial(peer *protocol.CNPeer, account interface{}, pkt protocol.Packet) error {
+func (server *LoginServer) FinishTutorial(peer *protocol.CNPeer, pkt protocol.Packet) error {
 	var charPkt protocol.SP_CL2LS_REQ_SAVE_CHAR_TUTOR
 	pkt.Decode(&charPkt)
 
-	if account == nil {
+	account, ok := peer.UserData().(*db.Account)
+	if !ok || account == nil {
 		return SendFail(peer)
 	}
 
-	if err := server.dbHndlr.FinishTutorial(int(charPkt.IPC_UID), account.(*db.Account).AccountID); err != nil {
+	if err := server.dbHndlr.FinishTutorial(int(charPkt.IPC_UID), account.AccountID); err != nil {
 		return SendFail(peer)
 	}
 

login/loginserver.go

@@ -1,6 +1,8 @@
 package login
 
 import (
+	"context"
+
 	"github.com/CPunch/gopenfusion/internal/db"
 	"github.com/CPunch/gopenfusion/internal/protocol"
 	"github.com/CPunch/gopenfusion/internal/redis"
@@ -13,8 +15,8 @@ type LoginServer struct {
 	redisHndlr *redis.RedisHandler
 }
 
-func NewLoginServer(dbHndlr *db.DBHandler, redisHndlr *redis.RedisHandler, port int) (*LoginServer, error) {
+func NewLoginServer(ctx context.Context, dbHndlr *db.DBHandler, redisHndlr *redis.RedisHandler, port int) (*LoginServer, error) {
-	srvc := service.NewService("LOGIN", port)
+	srvc := service.NewService(ctx, "LOGIN", port)
 
 	server := &LoginServer{
 		service:    srvc,
@@ -37,17 +39,9 @@ func NewLoginServer(dbHndlr *db.DBHandler, redisHndlr *redis.RedisHandler, port
 	srvc.AddPacketHandler(protocol.P_CL2LS_REQ_CHANGE_CHAR_NAME, service.StubbedPacket)
 	srvc.AddPacketHandler(protocol.P_CL2LS_REQ_SERVER_SELECT, service.StubbedPacket)
 
-	srvc.OnConnect = func(peer *protocol.CNPeer) interface{} {
-		return nil
-	}
-
 	return server, nil
 }
 
 func (server *LoginServer) Start() error {
 	return server.service.Start()
 }
-
-func (server *LoginServer) Stop() {
-	server.service.Stop()
-}

shard/chat.go

@@ -7,14 +7,14 @@ import (
 	"github.com/CPunch/gopenfusion/internal/protocol"
 )
 
-func (server *ShardServer) freeChat(peer *protocol.CNPeer, _plr interface{}, pkt protocol.Packet) error {
+func (server *ShardServer) freeChat(peer *protocol.CNPeer, pkt protocol.Packet) error {
 	var chat protocol.SP_CL2FE_REQ_SEND_FREECHAT_MESSAGE
 	pkt.Decode(&chat)
 
-	if _plr == nil {
+	plr, ok := peer.UserData().(*entity.Player)
-		return fmt.Errorf("freeChat: _plr is nil")
+	if !ok || plr == nil {
+		return fmt.Errorf("freeChat: plr is nil")
 	}
-	plr := _plr.(*entity.Player)
 
 	// spread message
 	return server.sendAllPacket(plr, protocol.P_FE2CL_REP_SEND_FREECHAT_MESSAGE_SUCC, protocol.SP_FE2CL_REP_SEND_FREECHAT_MESSAGE_SUCC{
@@ -24,14 +24,14 @@ func (server *ShardServer) freeChat(peer *protocol.CNPeer, _plr interface{}, pkt
 	})
 }
 
-func (server *ShardServer) menuChat(peer *protocol.CNPeer, _plr interface{}, pkt protocol.Packet) error {
+func (server *ShardServer) menuChat(peer *protocol.CNPeer, pkt protocol.Packet) error {
 	var chat protocol.SP_CL2FE_REQ_SEND_MENUCHAT_MESSAGE
 	pkt.Decode(&chat)
 
-	if _plr == nil {
+	plr, ok := peer.UserData().(*entity.Player)
-		return fmt.Errorf("menuChat: _plr is nil")
+	if !ok || plr == nil {
+		return fmt.Errorf("menuChat: plr is nil")
 	}
-	plr := _plr.(*entity.Player)
 
 	// spread message
 	return server.sendAllPacket(plr, protocol.P_FE2CL_REP_SEND_MENUCHAT_MESSAGE_SUCC, protocol.SP_FE2CL_REP_SEND_MENUCHAT_MESSAGE_SUCC{
@@ -41,14 +41,14 @@ func (server *ShardServer) menuChat(peer *protocol.CNPeer, _plr interface{}, pkt
 	})
 }
 
-func (server *ShardServer) emoteChat(peer *protocol.CNPeer, _plr interface{}, pkt protocol.Packet) error {
+func (server *ShardServer) emoteChat(peer *protocol.CNPeer, pkt protocol.Packet) error {
 	var chat protocol.SP_CL2FE_REQ_PC_AVATAR_EMOTES_CHAT
 	pkt.Decode(&chat)
 
-	if _plr == nil {
+	plr, ok := peer.UserData().(*entity.Player)
-		return fmt.Errorf("emoteChat: _plr is nil")
+	if !ok || plr == nil {
+		return fmt.Errorf("emoteChat: plr is nil")
 	}
-	plr := _plr.(*entity.Player)
 
 	// spread message
 	return server.sendAllPacket(plr, protocol.P_FE2CL_REP_PC_AVATAR_EMOTES_CHAT, protocol.SP_FE2CL_REP_PC_AVATAR_EMOTES_CHAT{

shard/join.go

@@ -20,16 +20,17 @@ func (server *ShardServer) attachPlayer(peer *protocol.CNPeer, meta redis.LoginM
 	// server.Start() goroutine. the only functions allowed to access
 	// it are the packet handlers as no other goroutines will be
 	// concurrently accessing it.
-	server.service.SetPeerData(peer, plr)
+	peer.SetUserData(plr)
 	return plr, nil
 }
 
-func (server *ShardServer) RequestEnter(peer *protocol.CNPeer, _plr interface{}, pkt protocol.Packet) error {
+func (server *ShardServer) RequestEnter(peer *protocol.CNPeer, pkt protocol.Packet) error {
 	var enter protocol.SP_CL2FE_REQ_PC_ENTER
 	pkt.Decode(&enter)
 
 	// resending a shard enter packet?
-	if _plr != nil {
+	_plr, ok := peer.UserData().(*entity.Player)
+	if ok && _plr != nil {
 		return fmt.Errorf("resent enter packet")
 	}
 
@@ -64,15 +65,15 @@ func (server *ShardServer) RequestEnter(peer *protocol.CNPeer, _plr interface{},
 	return nil
 }
 
-func (server *ShardServer) LoadingComplete(peer *protocol.CNPeer, _plr interface{}, pkt protocol.Packet) error {
+func (server *ShardServer) LoadingComplete(peer *protocol.CNPeer, pkt protocol.Packet) error {
 	var loadComplete protocol.SP_CL2FE_REQ_PC_LOADING_COMPLETE
 	pkt.Decode(&loadComplete)
 
 	// was the peer attached to a player?
-	if _plr == nil {
+	plr, ok := peer.UserData().(*entity.Player)
+	if !ok || plr == nil {
 		return fmt.Errorf("loadingComplete: plr is nil")
 	}
-	plr := _plr.(*entity.Player)
 
 	err := peer.Send(protocol.P_FE2CL_REP_PC_LOADING_COMPLETE_SUCC, protocol.SP_FE2CL_REP_PC_LOADING_COMPLETE_SUCC{IPC_ID: int32(plr.PlayerID)})
 	if err != nil {

shard/movement.go

@@ -15,14 +15,14 @@ func (server *ShardServer) updatePlayerPosition(plr *entity.Player, X, Y, Z, Ang
 	server.updateEntityChunk(plr, plr.GetChunkPos(), entity.MakeChunkPosition(X, Y))
 }
 
-func (server *ShardServer) playerMove(peer *protocol.CNPeer, _plr interface{}, pkt protocol.Packet) error {
+func (server *ShardServer) playerMove(peer *protocol.CNPeer, pkt protocol.Packet) error {
 	var move protocol.SP_CL2FE_REQ_PC_MOVE
 	pkt.Decode(&move)
 
-	if _plr == nil {
+	plr, ok := peer.UserData().(*entity.Player)
-		return fmt.Errorf("playerMove: _plr is nil")
+	if !ok || plr == nil {
+		return fmt.Errorf("playerMove: plr is nil")
 	}
-	plr := _plr.(*entity.Player)
 
 	// update chunking
 	server.updatePlayerPosition(plr, int(move.IX), int(move.IY), int(move.IZ), int(move.IAngle))
@@ -43,14 +43,14 @@ func (server *ShardServer) playerMove(peer *protocol.CNPeer, _plr interface{}, p
 	})
 }
 
-func (server *ShardServer) playerStop(peer *protocol.CNPeer, _plr interface{}, pkt protocol.Packet) error {
+func (server *ShardServer) playerStop(peer *protocol.CNPeer, pkt protocol.Packet) error {
 	var stop protocol.SP_CL2FE_REQ_PC_STOP
 	pkt.Decode(&stop)
 
-	if _plr == nil {
+	plr, ok := peer.UserData().(*entity.Player)
-		return fmt.Errorf("playerStop: _plr is nil")
+	if !ok || plr == nil {
+		return fmt.Errorf("playerStop: plr is nil")
 	}
-	plr := _plr.(*entity.Player)
 
 	// update chunking
 	server.updatePlayerPosition(plr, int(stop.IX), int(stop.IY), int(stop.IZ), plr.Angle)
@@ -65,14 +65,14 @@ func (server *ShardServer) playerStop(peer *protocol.CNPeer, _plr interface{}, p
 	})
 }
 
-func (server *ShardServer) playerJump(peer *protocol.CNPeer, _plr interface{}, pkt protocol.Packet) error {
+func (server *ShardServer) playerJump(peer *protocol.CNPeer, pkt protocol.Packet) error {
 	var jump protocol.SP_CL2FE_REQ_PC_JUMP
 	pkt.Decode(&jump)
 
-	if _plr == nil {
+	plr, ok := peer.UserData().(*entity.Player)
+	if !ok || plr == nil {
 		return fmt.Errorf("playerJump: _plr is nil")
 	}
-	plr := _plr.(*entity.Player)
 
 	// update chunking
 	server.updatePlayerPosition(plr, int(jump.IX), int(jump.IY), int(jump.IZ), plr.Angle)

shard/shardserver.go

@@ -1,6 +1,8 @@
 package shard
 
 import (
+	"context"
+
 	"github.com/CPunch/gopenfusion/config"
 	"github.com/CPunch/gopenfusion/internal/db"
 	"github.com/CPunch/gopenfusion/internal/entity"
@@ -18,8 +20,8 @@ type ShardServer struct {
 	chunks     map[entity.ChunkPosition]*entity.Chunk
 }
 
-func NewShardServer(dbHndlr *db.DBHandler, redisHndlr *redis.RedisHandler, port int) (*ShardServer, error) {
+func NewShardServer(ctx context.Context, dbHndlr *db.DBHandler, redisHndlr *redis.RedisHandler, port int) (*ShardServer, error) {
-	srvc := service.NewService("SHARD", port)
+	srvc := service.NewService(ctx, "SHARD", port)
 
 	server := &ShardServer{
 		service:    srvc,
@@ -53,13 +55,14 @@ func (server *ShardServer) Start() {
 	server.service.Start()
 }
 
-func (server *ShardServer) onDisconnect(peer *protocol.CNPeer, _plr interface{}) {
+func (server *ShardServer) onDisconnect(peer *protocol.CNPeer) {
 	// remove from chunks
-	if _plr != nil {
+	plr, ok := peer.UserData().(*entity.Player)
-		server.removeEntity(_plr.(*entity.Player))
+	if ok && plr != nil {
+		server.removeEntity(plr)
 	}
 }
 
-func (server *ShardServer) onConnect(peer *protocol.CNPeer) interface{} {
+func (server *ShardServer) onConnect(peer *protocol.CNPeer) {
-	return nil
+
 }