kennel/engine/systems/network.py

@@ -1,7 +1,7 @@
 import asyncio
 from abc import abstractmethod
 from enum import Enum
-from typing import List, Optional
+from typing import List, Optional, Dict
 
 from kennel.app import logger
 from kennel.engine.entities.entity import Entity, EntityManager
@@ -55,7 +55,9 @@ class Event:
 
 
 class InitialStateEvent(Event):
-    def __init__(self, world_width: int, world_height: int, entities: List[Entity]):
+    def __init__(
+        self, world_width: int, world_height: int, entities: Dict[str, Entity]
+    ):
         self.world_width = world_width
         self.world_height = world_height
         self.entities = entities
@@ -63,7 +65,7 @@ class InitialStateEvent(Event):
             EventType.INITIAL_STATE,
             {
                 "world": {"width": world_width, "height": world_height},
-                "entities": [entity.to_dict() for entity in entities],
+                "entities": entities,
             },
         )
 
@@ -98,51 +100,66 @@ class EntityDeathEvent(Event):
 
 class Publishable:
     @abstractmethod
-    async def publish(self, event: Event):
+    async def publish(self, event: List[Event]):
         pass
 
 
-class EventProcessor:
+class UpstreamEventProcessor:
     @abstractmethod
     def accept(
-        self, entity_manager: EntityManager, event: Event | tuple[Event, str]
+        self, entity_manager: EntityManager, client_event: tuple[Event, str]
-    ) -> None:
+    ) -> Optional[Event]:
         pass
 
 
 class NetworkSystem(System):
-    def __init__(self, event_processor: EventProcessor):
+    event_processor: UpstreamEventProcessor
-        super().__init__(SystemType.NETWORK)
+    sever_events: List[Event]
-        self.event_processor = event_processor
+    client_upstream_events: List[tuple[Event, str]]
+    clients: Dict[str, tuple[Publishable, List[Event]]]
+
+    def __init__(self, upstream_event_processor: UpstreamEventProcessor):
+        super().__init__(SystemType.NETWORK)
+        self.upstream_event_processor = upstream_event_processor
+
+        self.server_events = []  # events to propogate to the entire network
+        self.client_upstream_events = []  # events that come from the clients
 
-        self.events = []
-        self.client_events = []
         self.clients = {}
 
     async def update(self, entity_manager: EntityManager, delta_time: float) -> None:
-        if len(self.events) + len(self.client_events) == 0:
+        for event in self.client_upstream_events:
-            return
+            produced_event = self.upstream_event_processor.accept(entity_manager, event)
-        for event in self.events + self.client_events:
+            if produced_event is not None:
-            self.event_processor.accept(entity_manager, event)
+                self.server_events.append(produced_event)
-        client_sendable = self.events + [event for event, _ in self.client_events]
+        promises = [
-        await asyncio.gather(
+            client.publish(self.server_events + events)
-            *[
+            for client, events in self.clients.values()
-                client.publish(event)
+            if len(self.server_events + events) > 0
-                for client in self.clients.values()
-                for event in client_sendable
         ]
-        )
+        await asyncio.gather(*promises)
-        self.events = []
-        self.client_events = []
 
-    def client_event(self, client_id: str, event: Event) -> None:
+        self.server_events = []
-        self.client_events.append((event, client_id))
+        self.client_upstream_events = []
+        for client_id in self.clients.keys():
+            (client, _) = self.clients[client_id]
+            self.clients[client_id] = (client, [])
 
-    def add_event(self, event: Event) -> None:
+    def server_global_event(self, event: Event) -> None:
-        self.events.append(event)
+        self.server_events.append(event)
+
+    def client_upstream_event(self, client_id: str, event: Event) -> None:
+        self.client_upstream_events.append((event, client_id))
+
+    def client_downstream_event(self, client_id: str, event: Event) -> None:
+        if client_id not in self.clients:
+            logger.info(f"client {client_id} not found")
+            return
+        (client, events) = self.clients[client_id]
+        self.clients[client_id] = (client, events + [event])
 
     def add_client(self, client_id: str, client: Publishable) -> None:
-        self.clients[client_id] = client
+        self.clients[client_id] = (client, [])
 
     def remove_client(self, client_id: str) -> None:
         del self.clients[client_id]

kennel/kennel.py

@@ -1,5 +1,5 @@
 import uuid
-from typing import List
+from typing import List, Optional
 
 from kennel.config import config
 from kennel.engine.components.component import ComponentType
@@ -9,7 +9,7 @@ from kennel.engine.game import Game
 from kennel.engine.systems.network import (
     EntityPositionUpdateEvent,
     Event,
-    EventProcessor,
+    UpstreamEventProcessor,
     EventType,
     NetworkSystem,
 )
@@ -22,27 +22,22 @@ entity_manager = EntityManager()
 system_manager = SystemManager()
 
 
-class KennelEventProcessor(EventProcessor):
+class KennelEventProcessor(UpstreamEventProcessor):
     def accept(
-        self, entity_manager: EntityManager, event: Event | tuple[Event, str]
+        self, entity_manager: EntityManager, event: tuple[Event, str]
-    ) -> None:
+    ) -> Optional[Event]:
-        if isinstance(event, tuple):
         client_event, client_id = event
-            self._process_client_event(entity_manager, client_event, client_id)
+        if client_event.event_type == EventType.ENTITY_POSITION_UPDATE:
-            return
+            return self._process_entity_position_update(
-
+                entity_manager, client_event, client_id
-    def _process_client_event(
+            )
-        self, entity_manager: EntityManager, event: Event, client_id: str
-    ) -> None:
-        if event.event_type == EventType.ENTITY_POSITION_UPDATE:
-            self._process_entity_position_update(entity_manager, event, client_id)
 
     def _process_entity_position_update(
         self,
         entity_manager: EntityManager,
         event: EntityPositionUpdateEvent,
         client_id: str,
-    ) -> None:
+    ) -> Optional[Event]:
         entity = entity_manager.get_entity(event.data["id"])
         if entity is None:
             logger.error(f"Entity(id={event.data['id']}) does not exist")
@@ -60,6 +55,7 @@ class KennelEventProcessor(EventProcessor):
 
         entity.add_component(position)
         entity_manager.add_entity(entity)
+        return event
 
 
 system_manager.add_system(WorldSystem(config.WORLD_WIDTH, config.WORLD_HEIGHT))

kennel/main.py

@@ -1,6 +1,6 @@
 import asyncio
 import uuid
-from typing import Annotated, Optional
+from typing import Annotated, Optional, List
 
 from fastapi import (
     Cookie,
@@ -82,8 +82,8 @@ class WebSocketClient(Publishable):
     def __init__(self, websocket: WebSocket):
         self.websocket = websocket
 
-    async def publish(self, event: Event):
+    async def publish(self, events: List[Event]):
-        await self.websocket.send_json([event.event_type, event.data])
+        await self.websocket.send_json([event.to_dict() for event in events])
 
 
 @app.websocket("/ws")
@@ -95,27 +95,30 @@ async def websocket_endpoint(
     client = WebSocketClient(websocket)
     logger.info(f"Websocket connection established for session {session}")
 
-    initial_state = InitialStateEvent(
-        config.WORLD_WIDTH, config.WORLD_HEIGHT, kennel.entity_manager.to_dict()
-    )
-    await client.publish(initial_state)
-
     session_entities = create_session_controllable_entities(session)
     logger.info(f"Creating {len(session_entities)} entities for session {session}")
     try:
         network_system = system_manager.get_system(SystemType.NETWORK)
         if network_system is None:
             raise "Network system not found"
+        network_system.add_client(session, WebSocketClient(websocket))
+
+        network_system.client_downstream_event(
+            session,
+            InitialStateEvent(
+                config.WORLD_WIDTH, config.WORLD_HEIGHT, kennel.entity_manager.to_dict()
+            ),
+        )
 
         for entity in session_entities:
             logger.info(f"Adding entity {entity.id} for session {session}")
             entity_manager.add_entity(entity)
-            network_system.add_event(EntityBornEvent(entity))
 
-            set_controllable_event = SetControllableEvent(entity.id, session)
+            network_system.server_global_event(EntityBornEvent(entity))
-            await client.publish(set_controllable_event)
+            network_system.client_downstream_event(
+                session, SetControllableEvent(entity.id, session)
+            )
 
-        network_system.add_client(session, WebSocketClient(websocket))
         while True:
             message = await websocket.receive_json()
             if not isinstance(message, list):
@@ -125,20 +128,20 @@ async def websocket_endpoint(
                 logger.info(f"Invalid events in: {message}"[:100])
                 continue
             for event in events:
-                network_system.client_event(session, event)
+                network_system.client_upstream_event(session, event)
     except WebSocketDisconnect:
         logger.info(f"Websocket connection closed by client: {session}")
     except Exception as e:
         logger.error("Exception occurred", exc_info=e)
     finally:
-        logger.info("Websocket connection closed")
+        network_system.remove_client(session)
         for entity in session_entities:
             logger.info(f"Removing entity {entity.id} for session {session}")
             entity_manager.remove_entity(entity.id)
             network_system.add_event(Event(EventType.ENTITY_DEATH, {"id": entity.id}))
 
-        network_system.remove_client(session)
         await websocket.close()
+        logger.info("Websocket connection closed")
 
 
 @app.get("/healthcheck")

static/src/main.ts

@@ -65,9 +65,11 @@ class KennelClient {
           break;
       }
     }
-
+    if (events.length > 0) {
       console.log(events, dt);
+    }
     this.event_queue.clear();
+    this.event_publisher.publish();
   }
 
   private process_set_controllable_event(event: SetControllableEvent) {

static/src/mouse_controller.ts

@@ -7,7 +7,6 @@ export class MouseController {
   constructor(
     private readonly publisher: (new_movement: Vec2) => void | Promise<void>,
     private readonly debounce_ms = 200,
-    private readonly l2_norm_threshold = 40,
   ) {}
 
   public start() {
@@ -29,20 +28,14 @@ export class MouseController {
   }
 
   public move(x: number, y: number) {
-    const new_movement = new Vec2(x, y);
+    this.last_movement = new Vec2(x, y);
-    if (
-      typeof this.last_movement !== "undefined" &&
-      new_movement.distance_to(this.last_movement) >= this.l2_norm_threshold
-    ) {
     this.publish_movement();
   }
-    this.last_movement = new_movement;
-  }
 
   private publish_movement() {
     if (
-      typeof this.last_movement === "undefined" ||
+      Date.now() - this.last_event_time < this.debounce_ms ||
-      Date.now() - this.last_event_time < this.debounce_ms
+      typeof this.last_movement === "undefined"
     ) {
       return;
     }

static/src/network.ts

@@ -66,8 +66,7 @@ export class WebSocketEventQueue implements EventQueue {
 
   private listen_to(websocket: WebSocket) {
     websocket.onmessage = ({ data }) => {
-      const [event_type, event_data] = JSON.parse(data);
+      this.queue = this.queue.concat(JSON.parse(data));
-      this.queue.push({ event_type, data: event_data } as Event);
     };
   }
 }
@@ -84,6 +83,9 @@ export class WebsocketEventPublisher implements EventPublisher {
   }
 
   public publish() {
+    if (this.queue.length === 0) {
+      return;
+    }
     this.websocket.send(JSON.stringify(this.queue));
     this.queue = [];
   }