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import asyncio
import uuid
from typing import Annotated, List, Optional
from fastapi import (
Cookie,
Depends,
Request,
Response,
WebSocket,
WebSocketDisconnect,
WebSocketException,
status,
)
from fastapi.responses import FileResponse
from fastapi.staticfiles import StaticFiles
from kennel.app import app, logger
from kennel.config import config
from kennel.engine.systems.network import (
EntityBornEvent,
Event,
EventType,
InitialStateEvent,
Publishable,
SetControllableEvent,
)
from kennel.engine.systems.system import SystemType
from kennel.kennel import (
create_session_controllable_entities,
entity_manager,
kennel,
system_manager,
)
app.mount("/static", StaticFiles(directory="static/dist"), name="static")
loop = asyncio.get_event_loop()
@app.on_event("startup")
async def startup_event():
logger.info("Starting Kennel...")
loop.create_task(kennel.run())
@app.on_event("shutdown")
async def shutdown_event():
logger.info("Stopping Kennel...")
kennel.stop()
loop.stop()
logger.info("Kennel stopped")
@app.get("/")
async def index(request: Request):
return FileResponse("static/dist/index.html", media_type="text/html")
@app.get("/assign")
async def assign(
response: Response,
session: Annotated[Optional[str], Cookie()] = None,
):
if session is None:
session = str(uuid.uuid4().hex)
response.set_cookie(key="session", value=session, max_age=config.COOKIE_MAX_AGE)
return {"session": session}
async def get_cookie_or_token(
websocket: WebSocket,
session: Annotated[str | None, Cookie()] = None,
):
if session is None:
raise WebSocketException(code=status.WS_1008_POLICY_VIOLATION)
return session
class WebSocketClient(Publishable):
def __init__(self, websocket: WebSocket):
self.websocket = websocket
async def publish(self, events: List[Event]):
await self.websocket.send_json([event.to_dict() for event in events])
@app.websocket("/ws")
async def websocket_endpoint(
websocket: WebSocket,
session: Annotated[str, Depends(get_cookie_or_token)],
):
await websocket.accept()
logger.info(f"Websocket connection established for session {session}")
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.server_global_event(EntityBornEvent(entity))
network_system.client_downstream_event(
session, SetControllableEvent(entity.id, session)
)
while True:
message = await websocket.receive_json()
if not isinstance(message, list):
message = [message]
events = [Event.from_dict(event) for event in message]
if not all([event is not None for event in events]):
logger.info(f"Invalid events in: {message}"[:100])
continue
for event in events:
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:
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}))
await websocket.close()
logger.info("Websocket connection closed")
@app.get("/healthcheck")
async def healthcheck():
return Response("healthy")
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