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PacketLogicHandler.go
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PacketLogicHandler.go
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package peer
import (
"context"
"fmt"
"net"
"sync"
"time"
"github.com/Gskartwii/roblox-dissector/datamodel"
"github.com/olebedev/emitter"
"github.com/robloxapi/rbxfile"
)
// PacketLogicHandler is a generic struct for connections which
// should implements DataModelHandlers
// TODO: Add Logger to this struct?
type PacketLogicHandler struct {
*ConnectedPeer
Context *CommunicationContext
RunningContext context.Context
CancelFunc func()
ackTicker *time.Ticker
dataPingTicker *time.Ticker
remoteIndices map[*datamodel.Instance]uint32
remoteLock *sync.Mutex
Connection *net.UDPConn
pingInterval int
DataModel *datamodel.DataModel
Connected bool
GenericEvents *emitter.Emitter
}
func newPacketLogicHandler(ctx context.Context, commContext *CommunicationContext, withClient bool) PacketLogicHandler {
ctx, cancelFunc := context.WithCancel(ctx)
return PacketLogicHandler{
ConnectedPeer: NewConnectedPeer(commContext, withClient),
remoteIndices: make(map[*datamodel.Instance]uint32),
remoteLock: &sync.Mutex{},
Context: commContext,
DataModel: commContext.DataModel,
RunningContext: ctx,
CancelFunc: cancelFunc,
GenericEvents: emitter.New(0),
}
}
// only used by server and Studio? client must use ClientPacketLogic.go
func (logicHandler *PacketLogicHandler) startDataPing() {
// boot up dataping
logicHandler.dataPingTicker = time.NewTicker(time.Duration(logicHandler.pingInterval) * time.Millisecond)
go func() {
for {
select {
case <-logicHandler.dataPingTicker.C:
logicHandler.WritePacket(&Packet83Layer{
[]Packet83Subpacket{&Packet83_05{
Timestamp: uint64(time.Now().UnixNano() / int64(time.Millisecond)),
PacketVersion: 0,
}},
})
case <-logicHandler.RunningContext.Done():
return
}
}
}()
}
func (logicHandler *PacketLogicHandler) startAcker() {
logicHandler.ackTicker = time.NewTicker(500 * time.Millisecond)
go func() {
for {
select {
case <-logicHandler.ackTicker.C:
err := logicHandler.sendACKs()
if err != nil {
println("ACK Error:", err.Error())
}
case <-logicHandler.RunningContext.Done():
return
}
}
}()
}
func (logicHandler *PacketLogicHandler) defaultReliabilityLayerHandler(e *emitter.Event) {
logicHandler.mustACK = append(logicHandler.mustACK, int(e.Args[0].(*PacketLayers).RakNet.DatagramNumber))
}
func (logicHandler *PacketLogicHandler) cleanup() {
// Note: these will NOT close the channel!
if logicHandler.ackTicker != nil {
logicHandler.ackTicker.Stop()
}
if logicHandler.dataPingTicker != nil {
logicHandler.dataPingTicker.Stop()
}
logicHandler.CancelFunc()
}
// DisconnectionSource is a type describing what caused a disconnection
type DisconnectionSource uint
const (
// LocalDisconnection represents a disconnection caused by
// the local peer (i.e. by PacketLogicHandler.Disconnect())
LocalDisconnection DisconnectionSource = iota
// RemoteDisconnection represents a disconnection caused by
// the remote peer
RemoteDisconnection
)
// Disconnect sends a "-1" disconnection reason packet
// to the remote peer. Note that it doesn't close the
// underlying connection
func (logicHandler *PacketLogicHandler) Disconnect() {
if logicHandler.Connected {
logicHandler.WritePacket(&Packet15Layer{
Reason: -1,
})
logicHandler.Connected = false
<-logicHandler.GenericEvents.Emit("disconnected", LocalDisconnection, int32(-1))
logicHandler.Connection.Close()
logicHandler.cleanup()
}
}
func (logicHandler *PacketLogicHandler) sendDataPingBack() {
response := &Packet83_06{
Timestamp: uint64(time.Now().UnixNano() / int64(time.Millisecond)),
IsPingBack: true,
}
err := logicHandler.WriteDataPackets(response)
if err != nil {
println("Failed to send datapingback:", err.Error())
}
}
func (logicHandler *PacketLogicHandler) dataPingHandler(e *emitter.Event) {
logicHandler.sendDataPingBack()
}
func (logicHandler *PacketLogicHandler) disconnectHandler(e *emitter.Event) {
mainLayer := e.Args[0].(*Packet15Layer)
fmt.Printf("Received disconnect with reason %d\n", mainLayer.Reason)
<-logicHandler.GenericEvents.Emit("disconnected", RemoteDisconnection, mainLayer.Reason)
logicHandler.cleanup()
}
func (logicHandler *PacketLogicHandler) sendPing() {
packet := &Packet00Layer{
SendPingTime: uint64(time.Now().UnixNano() / int64(time.Millisecond)),
}
err := logicHandler.WritePacket(packet)
if err != nil {
println("Failed to write ping: ", err.Error())
}
}
func (logicHandler *PacketLogicHandler) sendPong(pingTime uint64) {
response := &Packet03Layer{
SendPingTime: pingTime,
SendPongTime: uint64(time.Now().UnixNano() / int64(time.Millisecond)),
}
err := logicHandler.WritePacket(response)
if err != nil {
println("Failed to write pong: ", err.Error())
}
}
func (logicHandler *PacketLogicHandler) pingHandler(packetType byte, layers *PacketLayers) {
mainLayer := layers.Main.(*Packet00Layer)
logicHandler.sendPong(mainLayer.SendPingTime)
}
func (logicHandler *PacketLogicHandler) bindDefaultHandlers() {
// common to all peers
logicHandler.DefaultPacketReader.LayerEmitter.On("reliability", logicHandler.defaultReliabilityLayerHandler, emitter.Void)
dataHandlers := logicHandler.DataEmitter
dataHandlers.On("ID_REPLIC_PING", logicHandler.dataPingHandler, emitter.Void)
basicHandlers := logicHandler.PacketEmitter
basicHandlers.On("ID_DISCONNECTION_NOTIFICATION", logicHandler.disconnectHandler, emitter.Void)
// do NOT call PacketReader.BindDefaultHandlers() here!
// ServerClients are packet readers which don't want that
}
// WriteDataPackets sends the given Packet83Subpackets to the peer
func (logicHandler *PacketLogicHandler) WriteDataPackets(packets ...Packet83Subpacket) error {
err := logicHandler.WritePacket(&Packet83Layer{
SubPackets: packets,
})
return err
}
// ReplicationInstance creates a new ReplicationInstance for
// the given DataModel instance
func (logicHandler *PacketLogicHandler) ReplicationInstance(inst *datamodel.Instance, deleteOnDisconnect bool) *ReplicationInstance {
repInstance := &ReplicationInstance{}
repInstance.DeleteOnDisconnect = deleteOnDisconnect
repInstance.Instance = inst
repInstance.Parent = inst.Parent()
repInstance.Schema = logicHandler.Context.NetworkSchema.SchemaForClass(inst.ClassName)
inst.PropertiesMutex.RLock()
repInstance.Properties = make(map[string]rbxfile.Value, len(inst.Properties))
for name, value := range inst.Properties {
repInstance.Properties[name] = value
}
inst.PropertiesMutex.RUnlock()
return repInstance
}
// SendEvent sends an event invocation and fires the event locally
func (logicHandler *PacketLogicHandler) SendEvent(instance *datamodel.Instance, name string, arguments ...rbxfile.Value) error {
instance.FireEvent(name, arguments...)
return logicHandler.WriteDataPackets(
&Packet83_07{
Instance: instance,
Schema: logicHandler.Context.NetworkSchema.SchemaForClass(instance.ClassName).SchemaForEvent(name),
Event: &ReplicationEvent{arguments},
},
)
}
// SendHackFlag attempts to fire the StatsAvailable event on the given player
func (logicHandler *PacketLogicHandler) SendHackFlag(player *datamodel.Instance, flag string) error {
return logicHandler.SendEvent(player, "StatsAvailable", rbxfile.ValueString(flag))
}
// ReplicateInstance sends an ID_REPLIC_NEW_INSTANCE to the peer
func (logicHandler *PacketLogicHandler) ReplicateInstance(inst *datamodel.Instance, deleteOnDisconnect bool) error {
return logicHandler.WriteDataPackets(&Packet83_02{logicHandler.ReplicationInstance(inst, deleteOnDisconnect)})
}