Try to handle tcp fragmentation

Reviewed-on: #1

README.md

@@ -0,0 +1,75 @@
+# GoonServer
+
+The server component for GoonScape, handling multiplayer synchronization and chat.
+
+## Features
+
+- Tick-based game state synchronization
+- Player movement validation
+- Global chat system
+- Client connection management
+- Protobuf-based network protocol
+
+## Prerequisites
+
+- Go 1.23 or higher
+- Protocol Buffers compiler (protoc)
+
+## Installation
+
+1. Clone the repository:
+```bash
+git clone https://gitea.boner.be/bdnugget/goonserver.git
+cd goonserver
+```
+
+2. Install dependencies:
+```bash
+go mod tidy
+```
+
+3. Build and run:
+```bash
+go run main.go
+```
+
+## Configuration
+
+Server settings can be modified in `main.go`:
+```go
+const (
+    port     = ":6969"               // Port to listen on
+    tickRate = 600 * time.Millisecond // Server tick rate
+)
+```
+
+## Protocol
+
+The server uses Protocol Buffers for client-server communication. The protocol is defined in `actions/actions.proto`:
+
+- `Action`: Player actions (movement, chat)
+- `ActionBatch`: Grouped actions from a player
+- `ServerMessage`: Game state updates to clients
+- `PlayerState`: Individual player state
+- `ChatMessage`: Player chat messages
+
+## Development
+
+After modifying the protocol (`actions.proto`), regenerate the Go code:
+```bash
+protoc --go_out=. actions/actions.proto
+```
+
+## Deployment
+
+The server is designed to run on a single instance. For production deployment:
+
+1. Build the binary:
+```bash
+go build -o goonserver
+```
+
+2. Run with logging:
+```bash
+./goonserver > server.log 2>&1 &
+```

actions/actions.pb.go

@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.28.1
-// 	protoc        v3.21.12
+// 	protoc-gen-go v1.36.2
+// 	protoc        v5.29.2
 // source: actions.proto
 
 package actions
@@ -24,15 +24,18 @@ type Action_ActionType int32
 
 const (
 	Action_MOVE Action_ActionType = 0
+	Action_CHAT Action_ActionType = 1
 )
 
 // Enum value maps for Action_ActionType.
 var (
 	Action_ActionType_name = map[int32]string{
 		0: "MOVE",
+		1: "CHAT",
 	}
 	Action_ActionType_value = map[string]int32{
 		"MOVE": 0,
+		"CHAT": 1,
 	}
 )
 
@@ -64,23 +67,21 @@ func (Action_ActionType) EnumDescriptor() ([]byte, []int) {
 }
 
 type Action struct {
-	state         protoimpl.MessageState
-	sizeCache     protoimpl.SizeCache
-	unknownFields protoimpl.UnknownFields
-
+	state         protoimpl.MessageState `protogen:"open.v1"`
 	Type          Action_ActionType      `protobuf:"varint,1,opt,name=type,proto3,enum=actions.Action_ActionType" json:"type,omitempty"`
 	X             int32                  `protobuf:"varint,2,opt,name=x,proto3" json:"x,omitempty"`
 	Y             int32                  `protobuf:"varint,3,opt,name=y,proto3" json:"y,omitempty"`
 	PlayerId      int32                  `protobuf:"varint,4,opt,name=player_id,json=playerId,proto3" json:"player_id,omitempty"`
+	ChatMessage   string                 `protobuf:"bytes,5,opt,name=chat_message,json=chatMessage,proto3" json:"chat_message,omitempty"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
 }
 
 func (x *Action) Reset() {
 	*x = Action{}
-	if protoimpl.UnsafeEnabled {
 	mi := &file_actions_proto_msgTypes[0]
 	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 	ms.StoreMessageInfo(mi)
-	}
 }
 
 func (x *Action) String() string {
@@ -91,7 +92,7 @@ func (*Action) ProtoMessage() {}
 
 func (x *Action) ProtoReflect() protoreflect.Message {
 	mi := &file_actions_proto_msgTypes[0]
-	if protoimpl.UnsafeEnabled && x != nil {
+	if x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
 			ms.StoreMessageInfo(mi)
@@ -134,33 +135,38 @@ func (x *Action) GetPlayerId() int32 {
 	return 0
 }
 
-type ServerMessage struct {
-	state         protoimpl.MessageState
-	sizeCache     protoimpl.SizeCache
-	unknownFields protoimpl.UnknownFields
-
-	PlayerId int32          `protobuf:"varint,1,opt,name=player_id,json=playerId,proto3" json:"player_id,omitempty"` // Only used when initially assigning player ID
-	Players  []*PlayerState `protobuf:"bytes,2,rep,name=players,proto3" json:"players,omitempty"`                    // Player state updates
+func (x *Action) GetChatMessage() string {
+	if x != nil {
+		return x.ChatMessage
+	}
+	return ""
 }
 
-func (x *ServerMessage) Reset() {
-	*x = ServerMessage{}
-	if protoimpl.UnsafeEnabled {
+type ActionBatch struct {
+	state         protoimpl.MessageState `protogen:"open.v1"`
+	PlayerId      int32                  `protobuf:"varint,1,opt,name=player_id,json=playerId,proto3" json:"player_id,omitempty"`
+	Actions       []*Action              `protobuf:"bytes,2,rep,name=actions,proto3" json:"actions,omitempty"`
+	Tick          int64                  `protobuf:"varint,3,opt,name=tick,proto3" json:"tick,omitempty"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *ActionBatch) Reset() {
+	*x = ActionBatch{}
 	mi := &file_actions_proto_msgTypes[1]
 	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 	ms.StoreMessageInfo(mi)
-	}
 }
 
-func (x *ServerMessage) String() string {
+func (x *ActionBatch) String() string {
 	return protoimpl.X.MessageStringOf(x)
 }
 
-func (*ServerMessage) ProtoMessage() {}
+func (*ActionBatch) ProtoMessage() {}
 
-func (x *ServerMessage) ProtoReflect() protoreflect.Message {
+func (x *ActionBatch) ProtoReflect() protoreflect.Message {
 	mi := &file_actions_proto_msgTypes[1]
-	if protoimpl.UnsafeEnabled && x != nil {
+	if x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
 			ms.StoreMessageInfo(mi)
@@ -170,42 +176,46 @@ func (x *ServerMessage) ProtoReflect() protoreflect.Message {
 	return mi.MessageOf(x)
 }
 
-// Deprecated: Use ServerMessage.ProtoReflect.Descriptor instead.
-func (*ServerMessage) Descriptor() ([]byte, []int) {
+// Deprecated: Use ActionBatch.ProtoReflect.Descriptor instead.
+func (*ActionBatch) Descriptor() ([]byte, []int) {
 	return file_actions_proto_rawDescGZIP(), []int{1}
 }
 
-func (x *ServerMessage) GetPlayerId() int32 {
+func (x *ActionBatch) GetPlayerId() int32 {
 	if x != nil {
 		return x.PlayerId
 	}
 	return 0
 }
 
-func (x *ServerMessage) GetPlayers() []*PlayerState {
+func (x *ActionBatch) GetActions() []*Action {
 	if x != nil {
-		return x.Players
+		return x.Actions
 	}
 	return nil
 }
 
-type PlayerState struct {
-	state         protoimpl.MessageState
-	sizeCache     protoimpl.SizeCache
-	unknownFields protoimpl.UnknownFields
+func (x *ActionBatch) GetTick() int64 {
+	if x != nil {
+		return x.Tick
+	}
+	return 0
+}
 
+type PlayerState struct {
+	state         protoimpl.MessageState `protogen:"open.v1"`
 	PlayerId      int32                  `protobuf:"varint,1,opt,name=player_id,json=playerId,proto3" json:"player_id,omitempty"`
 	X             int32                  `protobuf:"varint,2,opt,name=x,proto3" json:"x,omitempty"`
 	Y             int32                  `protobuf:"varint,3,opt,name=y,proto3" json:"y,omitempty"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
 }
 
 func (x *PlayerState) Reset() {
 	*x = PlayerState{}
-	if protoimpl.UnsafeEnabled {
 	mi := &file_actions_proto_msgTypes[2]
 	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 	ms.StoreMessageInfo(mi)
-	}
 }
 
 func (x *PlayerState) String() string {
@@ -216,7 +226,7 @@ func (*PlayerState) ProtoMessage() {}
 
 func (x *PlayerState) ProtoReflect() protoreflect.Message {
 	mi := &file_actions_proto_msgTypes[2]
-	if protoimpl.UnsafeEnabled && x != nil {
+	if x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
 			ms.StoreMessageInfo(mi)
@@ -252,33 +262,183 @@ func (x *PlayerState) GetY() int32 {
 	return 0
 }
 
+type ChatMessage struct {
+	state         protoimpl.MessageState `protogen:"open.v1"`
+	PlayerId      int32                  `protobuf:"varint,1,opt,name=player_id,json=playerId,proto3" json:"player_id,omitempty"`
+	Content       string                 `protobuf:"bytes,2,opt,name=content,proto3" json:"content,omitempty"`
+	Timestamp     int64                  `protobuf:"varint,3,opt,name=timestamp,proto3" json:"timestamp,omitempty"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *ChatMessage) Reset() {
+	*x = ChatMessage{}
+	mi := &file_actions_proto_msgTypes[3]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *ChatMessage) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*ChatMessage) ProtoMessage() {}
+
+func (x *ChatMessage) ProtoReflect() protoreflect.Message {
+	mi := &file_actions_proto_msgTypes[3]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use ChatMessage.ProtoReflect.Descriptor instead.
+func (*ChatMessage) Descriptor() ([]byte, []int) {
+	return file_actions_proto_rawDescGZIP(), []int{3}
+}
+
+func (x *ChatMessage) GetPlayerId() int32 {
+	if x != nil {
+		return x.PlayerId
+	}
+	return 0
+}
+
+func (x *ChatMessage) GetContent() string {
+	if x != nil {
+		return x.Content
+	}
+	return ""
+}
+
+func (x *ChatMessage) GetTimestamp() int64 {
+	if x != nil {
+		return x.Timestamp
+	}
+	return 0
+}
+
+type ServerMessage struct {
+	state         protoimpl.MessageState `protogen:"open.v1"`
+	PlayerId      int32                  `protobuf:"varint,1,opt,name=player_id,json=playerId,proto3" json:"player_id,omitempty"`
+	Players       []*PlayerState         `protobuf:"bytes,2,rep,name=players,proto3" json:"players,omitempty"`
+	CurrentTick   int64                  `protobuf:"varint,3,opt,name=current_tick,json=currentTick,proto3" json:"current_tick,omitempty"`
+	ChatMessages  []*ChatMessage         `protobuf:"bytes,4,rep,name=chat_messages,json=chatMessages,proto3" json:"chat_messages,omitempty"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *ServerMessage) Reset() {
+	*x = ServerMessage{}
+	mi := &file_actions_proto_msgTypes[4]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *ServerMessage) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*ServerMessage) ProtoMessage() {}
+
+func (x *ServerMessage) ProtoReflect() protoreflect.Message {
+	mi := &file_actions_proto_msgTypes[4]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use ServerMessage.ProtoReflect.Descriptor instead.
+func (*ServerMessage) Descriptor() ([]byte, []int) {
+	return file_actions_proto_rawDescGZIP(), []int{4}
+}
+
+func (x *ServerMessage) GetPlayerId() int32 {
+	if x != nil {
+		return x.PlayerId
+	}
+	return 0
+}
+
+func (x *ServerMessage) GetPlayers() []*PlayerState {
+	if x != nil {
+		return x.Players
+	}
+	return nil
+}
+
+func (x *ServerMessage) GetCurrentTick() int64 {
+	if x != nil {
+		return x.CurrentTick
+	}
+	return 0
+}
+
+func (x *ServerMessage) GetChatMessages() []*ChatMessage {
+	if x != nil {
+		return x.ChatMessages
+	}
+	return nil
+}
+
 var File_actions_proto protoreflect.FileDescriptor
 
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+	0x70, 0x6c, 0x61, 0x79, 0x65, 0x72, 0x73, 0x12, 0x21, 0x0a, 0x0c, 0x63, 0x75, 0x72, 0x72, 0x65,
+	0x6e, 0x74, 0x5f, 0x74, 0x69, 0x63, 0x6b, 0x18, 0x03, 0x20, 0x01, 0x28, 0x03, 0x52, 0x0b, 0x63,
+	0x75, 0x72, 0x72, 0x65, 0x6e, 0x74, 0x54, 0x69, 0x63, 0x6b, 0x12, 0x39, 0x0a, 0x0d, 0x63, 0x68,
+	0x61, 0x74, 0x5f, 0x6d, 0x65, 0x73, 0x73, 0x61, 0x67, 0x65, 0x73, 0x18, 0x04, 0x20, 0x03, 0x28,
+	0x0b, 0x32, 0x14, 0x2e, 0x61, 0x63, 0x74, 0x69, 0x6f, 0x6e, 0x73, 0x2e, 0x43, 0x68, 0x61, 0x74,
+	0x4d, 0x65, 0x73, 0x73, 0x61, 0x67, 0x65, 0x52, 0x0c, 0x63, 0x68, 0x61, 0x74, 0x4d, 0x65, 0x73,
+	0x73, 0x61, 0x67, 0x65, 0x73, 0x42, 0x2c, 0x5a, 0x2a, 0x67, 0x69, 0x74, 0x65, 0x61, 0x2e, 0x62,
+	0x6f, 0x6e, 0x65, 0x72, 0x2e, 0x62, 0x65, 0x2f, 0x62, 0x64, 0x6e, 0x75, 0x67, 0x67, 0x65, 0x74,
+	0x2f, 0x67, 0x6f, 0x6f, 0x6e, 0x73, 0x65, 0x72, 0x76, 0x65, 0x72, 0x2f, 0x61, 0x63, 0x74, 0x69,
+	0x6f, 0x6e, 0x73, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
@@ -294,21 +454,25 @@ func file_actions_proto_rawDescGZIP() []byte {
 }
 
 var file_actions_proto_enumTypes = make([]protoimpl.EnumInfo, 1)
-var file_actions_proto_msgTypes = make([]protoimpl.MessageInfo, 3)
-var file_actions_proto_goTypes = []interface{}{
+var file_actions_proto_msgTypes = make([]protoimpl.MessageInfo, 5)
+var file_actions_proto_goTypes = []any{
 	(Action_ActionType)(0), // 0: actions.Action.ActionType
 	(*Action)(nil),         // 1: actions.Action
-	(*ServerMessage)(nil),  // 2: actions.ServerMessage
+	(*ActionBatch)(nil),    // 2: actions.ActionBatch
 	(*PlayerState)(nil),    // 3: actions.PlayerState
+	(*ChatMessage)(nil),    // 4: actions.ChatMessage
+	(*ServerMessage)(nil),  // 5: actions.ServerMessage
 }
 var file_actions_proto_depIdxs = []int32{
 	0, // 0: actions.Action.type:type_name -> actions.Action.ActionType
-	3, // 1: actions.ServerMessage.players:type_name -> actions.PlayerState
-	2, // [2:2] is the sub-list for method output_type
-	2, // [2:2] is the sub-list for method input_type
-	2, // [2:2] is the sub-list for extension type_name
-	2, // [2:2] is the sub-list for extension extendee
-	0, // [0:2] is the sub-list for field type_name
+	1, // 1: actions.ActionBatch.actions:type_name -> actions.Action
+	3, // 2: actions.ServerMessage.players:type_name -> actions.PlayerState
+	4, // 3: actions.ServerMessage.chat_messages:type_name -> actions.ChatMessage
+	4, // [4:4] is the sub-list for method output_type
+	4, // [4:4] is the sub-list for method input_type
+	4, // [4:4] is the sub-list for extension type_name
+	4, // [4:4] is the sub-list for extension extendee
+	0, // [0:4] is the sub-list for field type_name
 }
 
 func init() { file_actions_proto_init() }
@@ -316,51 +480,13 @@ func file_actions_proto_init() {
 	if File_actions_proto != nil {
 		return
 	}
-	if !protoimpl.UnsafeEnabled {
-		file_actions_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*Action); i {
-			case 0:
-				return &v.state
-			case 1:
-				return &v.sizeCache
-			case 2:
-				return &v.unknownFields
-			default:
-				return nil
-			}
-		}
-		file_actions_proto_msgTypes[1].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*ServerMessage); i {
-			case 0:
-				return &v.state
-			case 1:
-				return &v.sizeCache
-			case 2:
-				return &v.unknownFields
-			default:
-				return nil
-			}
-		}
-		file_actions_proto_msgTypes[2].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*PlayerState); i {
-			case 0:
-				return &v.state
-			case 1:
-				return &v.sizeCache
-			case 2:
-				return &v.unknownFields
-			default:
-				return nil
-			}
-		}
-	}
 	type x struct{}
 	out := protoimpl.TypeBuilder{
 		File: protoimpl.DescBuilder{
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_actions_proto_rawDesc,
 			NumEnums:      1,
-			NumMessages:   3,
+			NumMessages:   5,
 			NumExtensions: 0,
 			NumServices:   0,
 		},

actions/actions.proto

@@ -7,17 +7,20 @@ option go_package = "gitea.boner.be/bdnugget/goonserver/actions";
 message Action {
     enum ActionType {
         MOVE = 0;
+        CHAT = 1;
     }
 
     ActionType type = 1;
     int32 x = 2;
     int32 y = 3;
     int32 player_id = 4;
+    string chat_message = 5;
 }
 
-message ServerMessage {
-    int32 player_id = 1; // Only used when initially assigning player ID
-    repeated PlayerState players = 2; // Player state updates
+message ActionBatch {
+    int32 player_id = 1;
+    repeated Action actions = 2;
+    int64 tick = 3;
 }
 
 message PlayerState {
@@ -25,3 +28,16 @@ message PlayerState {
     int32 x = 2;
     int32 y = 3;
 }
+
+message ChatMessage {
+    int32 player_id = 1;
+    string content = 2;
+    int64 timestamp = 3;
+}
+
+message ServerMessage {
+    int32 player_id = 1;
+    repeated PlayerState players = 2;
+    int64 current_tick = 3;
+    repeated ChatMessage chat_messages = 4;
+}

main.go

@@ -1,9 +1,13 @@
 package main
 
 import (
+	"bufio"
+	"encoding/binary"
 	"fmt"
+	"io"
 	"log"
 	"net"
+	"sync"
 	"time"
 
 	pb "gitea.boner.be/bdnugget/goonserver/actions"
@@ -17,12 +21,19 @@ const (
 )
 
 type Player struct {
+	sync.Mutex
 	ID   int
 	X, Y int // Position on the game grid
 }
 
-var players = make(map[int]*Player)
-var actionQueue = make(map[int][]*pb.Action) // Queue to store actions for each player
+var (
+	players     = make(map[int]*Player)
+	actionQueue = make(map[int][]*pb.Action) // Queue to store actions for each player
+	playerConns = make(map[int]net.Conn)     // Map to store player connections
+	mu          sync.RWMutex                 // Add mutex for protecting shared maps
+	chatHistory = make([]*pb.ChatMessage, 0, 100)
+	chatMutex   sync.RWMutex
+)
 
 func main() {
 	ln, err := net.Listen("tcp", port)
@@ -47,7 +58,6 @@ func main() {
 	for {
 		if time.Since(lastTick) >= tickRate {
 			lastTick = time.Now()
-			// log.Printf("Last tick: %s", lastTick)
 			processActions()
 		}
 	}
@@ -56,56 +66,146 @@ func main() {
 func handleConnection(conn net.Conn) {
 	defer conn.Close()
 
-	// Assign a new player ID and add the player to the game state
+	mu.Lock()
 	playerID := len(players) + 1
-	players[playerID] = &Player{ID: playerID, X: 5, Y: 5} // Start at default position
+	newPlayer := &Player{ID: playerID, X: 5, Y: 5}
+	players[playerID] = newPlayer
+	playerConns[playerID] = conn
+	mu.Unlock()
 	fmt.Printf("Player %d connected\n", playerID)
 
 	// Send player ID to the client
 	serverMsg := &pb.ServerMessage{
 		PlayerId:    int32(playerID),
+		CurrentTick: 0,
 	}
-	data, err := proto.Marshal(serverMsg)
-	if err != nil {
-		log.Printf("Failed to marshal ServerMessage for player %d: %v", playerID, err)
-		return
-	}
-	if _, err := conn.Write(data); err != nil {
+	if err := writeMessage(conn, serverMsg); err != nil {
 		log.Printf("Failed to send player ID to player %d: %v", playerID, err)
 		return
 	}
 
 	// Listen for incoming actions from this player
-	buf := make([]byte, 4096)
+	reader := bufio.NewReader(conn)
 	for {
-		n, err := conn.Read(buf)
-		if err != nil {
-			log.Printf("Error reading from player %d: %v", playerID, err)
+		// Read message length
+		lengthBuf := make([]byte, 4)
+		if _, err := io.ReadFull(reader, lengthBuf); err != nil {
+			log.Printf("Error reading message length from player %d: %v", playerID, err)
 			delete(players, playerID)
+			delete(playerConns, playerID)
+			delete(actionQueue, playerID)
+			return
+		}
+		messageLength := binary.BigEndian.Uint32(lengthBuf)
+
+		// Read message body
+		messageBuf := make([]byte, messageLength)
+		if _, err := io.ReadFull(reader, messageBuf); err != nil {
+			log.Printf("Error reading message from player %d: %v", playerID, err)
+			delete(players, playerID)
+			delete(playerConns, playerID)
+			delete(actionQueue, playerID)
 			return
 		}
 
-		action := &pb.Action{}
-		if err := proto.Unmarshal(buf[:n], action); err != nil {
-			log.Printf("Failed to unmarshal action for player %d: %v", playerID, err)
+		batch := &pb.ActionBatch{}
+		if err := proto.Unmarshal(messageBuf, batch); err != nil {
+			log.Printf("Failed to unmarshal action batch for player %d: %v", playerID, err)
 			continue
 		}
 
-		// Queue the action for processing in the game loop
-		actionQueue[playerID] = append(actionQueue[playerID], action)
+		// Queue the actions for processing
+		if batch.PlayerId == int32(playerID) {
+			actionQueue[playerID] = append(actionQueue[playerID], batch.Actions...)
+		}
 	}
 }
 
+func addChatMessage(playerID int32, content string) {
+	chatMutex.Lock()
+	defer chatMutex.Unlock()
+
+	msg := &pb.ChatMessage{
+		PlayerId:  playerID,
+		Content:   content,
+		Timestamp: time.Now().UnixNano(),
+	}
+
+	if len(chatHistory) >= 100 {
+		chatHistory = chatHistory[1:]
+	}
+	chatHistory = append(chatHistory, msg)
+}
+
 func processActions() {
+	mu.Lock()
+	defer mu.Unlock()
+
+	// Update players based on queued actions
 	for playerID, actions := range actionQueue {
 		player := players[playerID]
+		player.Lock()
 		for _, action := range actions {
-			if action.Type == pb.Action_MOVE {
+			switch action.Type {
+			case pb.Action_MOVE:
 				player.X = int(action.X)
 				player.Y = int(action.Y)
 				fmt.Printf("Player %d moved to (%d, %d)\n", playerID, player.X, player.Y)
+			case pb.Action_CHAT:
+				addChatMessage(int32(playerID), action.ChatMessage)
+				fmt.Printf("Player %d says: %s\n", playerID, action.ChatMessage)
 			}
 		}
-		actionQueue[playerID] = nil // Clear the queue after processing
+		player.Unlock()
+		actionQueue[playerID] = nil // Clear the action queue after processing
+	}
+
+	// Prepare and broadcast the current game state
+	currentTick := time.Now().UnixNano() / int64(tickRate)
+	state := &pb.ServerMessage{
+		CurrentTick: currentTick,
+		Players:     make([]*pb.PlayerState, 0, len(players)),
+	}
+
+	// Convert players to PlayerState
+	for id, p := range players {
+		p.Lock()
+		state.Players = append(state.Players, &pb.PlayerState{
+			PlayerId: int32(id),
+			X:        int32(p.X),
+			Y:        int32(p.Y),
+		})
+		p.Unlock()
+	}
+
+	// Add new chat messages to the state
+	chatMutex.RLock()
+	state.ChatMessages = chatHistory[max(0, len(chatHistory)-5):] // Only send last 5 messages
+	chatMutex.RUnlock()
+
+	// Send to each connected player
+	for _, conn := range playerConns {
+		if err := writeMessage(conn, state); err != nil {
+			log.Printf("Failed to send update: %v", err)
+		}
 	}
 }
+
+// Helper function to write length-prefixed messages
+func writeMessage(conn net.Conn, msg proto.Message) error {
+	data, err := proto.Marshal(msg)
+	if err != nil {
+		return err
+	}
+
+	// Write length prefix
+	lengthBuf := make([]byte, 4)
+	binary.BigEndian.PutUint32(lengthBuf, uint32(len(data)))
+	if _, err := conn.Write(lengthBuf); err != nil {
+		return err
+	}
+
+	// Write message body
+	_, err = conn.Write(data)
+	return err
+}