Thorsten
f37dc9fa76
FastAPI + Postgres backend with fastapi-users auth, games/characters CRUD, and a WebSocket chat endpoint where an x.ai Grok DM narrates play, rolls dice, and maintains character sheets via tool calls. React + Tailwind frontend covers registration/login, game list and creation, participation-code join flow, character viewer, and a real-time chat session view. Docker Compose skeleton (Postgres + backend) included; Caddy/frontend container wiring is deferred to the deploy milestone. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
137 lines
4.9 KiB
Python
137 lines
4.9 KiB
Python
import asyncio
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import logging
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import uuid
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from fastapi import APIRouter, WebSocket, WebSocketDisconnect
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from sqlalchemy import select
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from app.db import async_session_maker
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from app.llm.orchestrator import run_dm_turn
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from app.models.game import GameParticipant
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from app.models.message import Message
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from app.ws_tickets import consume_ticket
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logger = logging.getLogger("app.ws_game")
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router = APIRouter()
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class ConnectionManager:
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def __init__(self) -> None:
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self._rooms: dict[uuid.UUID, set[WebSocket]] = {}
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self._locks: dict[uuid.UUID, asyncio.Lock] = {}
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def connect(self, game_id: uuid.UUID, websocket: WebSocket) -> None:
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self._rooms.setdefault(game_id, set()).add(websocket)
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def disconnect(self, game_id: uuid.UUID, websocket: WebSocket) -> None:
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room = self._rooms.get(game_id)
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if room is not None:
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room.discard(websocket)
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if not room:
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self._rooms.pop(game_id, None)
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async def broadcast(self, game_id: uuid.UUID, payload: dict) -> None:
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for ws in list(self._rooms.get(game_id, ())):
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try:
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await ws.send_json(payload)
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except Exception: # noqa: BLE001 — a dead socket shouldn't break the broadcast
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self.disconnect(game_id, ws)
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def get_lock(self, game_id: uuid.UUID) -> asyncio.Lock:
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return self._locks.setdefault(game_id, asyncio.Lock())
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manager = ConnectionManager()
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async def _serialize_message(session, message: Message) -> dict:
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from app.models.character import Character
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from app.models.user import User
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player_name = None
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character_name = None
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if message.user_id is not None:
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user = await session.get(User, message.user_id)
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player_name = user.name if user else None
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if message.character_id is not None:
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character = await session.get(Character, message.character_id)
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character_name = character.name if character else None
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return {
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"id": message.id,
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"sender_type": message.sender_type,
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"user_id": str(message.user_id) if message.user_id else None,
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"player_name": player_name,
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"character_id": str(message.character_id) if message.character_id else None,
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"character_name": character_name,
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"content": message.content,
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"created_at": message.created_at.isoformat(),
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}
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@router.websocket("/ws/games/{game_id}")
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async def game_websocket(websocket: WebSocket, game_id: uuid.UUID, ticket: str) -> None:
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user_id = consume_ticket(ticket, game_id)
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if user_id is None:
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await websocket.close(code=4401)
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return
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await websocket.accept()
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manager.connect(game_id, websocket)
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try:
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while True:
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data = await websocket.receive_json()
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if data.get("type") != "message":
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continue
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content = (data.get("content") or "").strip()
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if not content:
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continue
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async with manager.get_lock(game_id):
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async with async_session_maker() as session:
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participant = (
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await session.execute(
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select(GameParticipant).where(
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GameParticipant.game_id == game_id,
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GameParticipant.user_id == user_id,
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)
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)
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).scalar_one_or_none()
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if participant is None:
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await websocket.send_json({"type": "error", "detail": "not a participant"})
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continue
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player_message = Message(
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game_id=game_id,
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sender_type="player",
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user_id=user_id,
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character_id=participant.character_id,
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content=content,
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)
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session.add(player_message)
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await session.commit()
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await session.refresh(player_message)
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await manager.broadcast(
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game_id,
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{"type": "message", "message": await _serialize_message(session, player_message)},
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)
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try:
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dm_message = await run_dm_turn(session, game_id)
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except Exception: # noqa: BLE001
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logger.exception("DM turn failed for game %s", game_id)
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await websocket.send_json({"type": "error", "detail": "dm_turn_failed"})
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continue
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await manager.broadcast(
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game_id,
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{"type": "message", "message": await _serialize_message(session, dm_message)},
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)
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except WebSocketDisconnect:
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pass
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finally:
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manager.disconnect(game_id, websocket)
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