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"""
FastAPI WebSocket server for the Boids Interactive Demo.
Provides real-time simulation streaming and parameter control.
"""
import asyncio
from contextlib import asynccontextmanager
from typing import Dict
from fastapi import FastAPI, WebSocket, WebSocketDisconnect
from fastapi.middleware.cors import CORSMiddleware
from config import TARGET_FPS, MessageType
from models import (
parse_client_message,
UpdateParamsMessage,
ResetMessage,
PauseMessage,
ResumeMessage,
ParamsSyncMessage,
ErrorMessage,
)
from simulation_manager import SimulationManager
from presets import get_preset_params, is_valid_preset
# =============================================================================
# Application Lifespan
# =============================================================================
@asynccontextmanager
async def lifespan(app: FastAPI):
"""Application startup and shutdown."""
print("Boids Interactive Demo starting...")
yield
print("Boids Interactive Demo shutting down...")
# =============================================================================
# FastAPI Application
# =============================================================================
app = FastAPI(
title="Boids Interactive Demo",
description="Real-time boids simulation with WebSocket streaming",
version="1.0.0",
lifespan=lifespan,
)
# CORS middleware for frontend
app.add_middleware(
CORSMiddleware,
allow_origins=["*"],
allow_credentials=True,
allow_methods=["*"],
allow_headers=["*"],
)
# =============================================================================
# REST Endpoints
# =============================================================================
@app.get("/")
async def root():
"""Health check endpoint."""
return {"status": "ok", "service": "boids-interactive"}
@app.get("/health")
async def health():
"""Health check endpoint."""
return {"status": "healthy"}
# =============================================================================
# WebSocket Connection Manager
# =============================================================================
class ConnectionManager:
"""Manages WebSocket connections and their simulations."""
def __init__(self):
self.active_connections: Dict[WebSocket, SimulationManager] = {}
async def connect(self, websocket: WebSocket) -> SimulationManager:
"""Accept connection and create simulation."""
await websocket.accept()
manager = SimulationManager()
manager.start()
self.active_connections[websocket] = manager
return manager
def disconnect(self, websocket: WebSocket) -> None:
"""Remove connection and stop simulation."""
if websocket in self.active_connections:
manager = self.active_connections[websocket]
manager.stop()
del self.active_connections[websocket]
def get_manager(self, websocket: WebSocket) -> SimulationManager:
"""Get simulation manager for connection."""
return self.active_connections.get(websocket)
connection_manager = ConnectionManager()
# =============================================================================
# Message Handlers
# =============================================================================
async def handle_message(
websocket: WebSocket,
manager: SimulationManager,
data: dict
) -> None:
"""Handle incoming WebSocket message."""
msg_type = data.get("type")
# Handle obstacle messages first
if await handle_obstacle_message(websocket, manager, data):
return
# Handle preset separately to give better error messages
if msg_type == MessageType.PRESET:
preset_name = data.get("name", "")
if is_valid_preset(preset_name):
preset_params = get_preset_params(preset_name)
manager.update_params(preset_params)
sync = ParamsSyncMessage(params=manager.get_params_dict())
await websocket.send_json(sync.model_dump())
else:
error = ErrorMessage(message=f"Invalid preset: {preset_name}")
await websocket.send_json(error.model_dump())
return
message = parse_client_message(data)
if message is None:
error = ErrorMessage(message=f"Unknown message type: {msg_type}")
await websocket.send_json(error.model_dump())
return
if isinstance(message, UpdateParamsMessage):
manager.update_params(message.params)
sync = ParamsSyncMessage(params=manager.get_params_dict())
await websocket.send_json(sync.model_dump())
elif isinstance(message, ResetMessage):
manager.reset()
sync = ParamsSyncMessage(params=manager.get_params_dict())
await websocket.send_json(sync.model_dump())
elif isinstance(message, PauseMessage):
manager.pause()
elif isinstance(message, ResumeMessage):
manager.resume()
async def handle_obstacle_message(
websocket: WebSocket,
manager: SimulationManager,
data: dict
) -> bool:
"""
Handle obstacle-related messages.
Returns True if message was handled, False otherwise.
"""
msg_type = data.get("type")
if msg_type == MessageType.ADD_OBSTACLE:
x = data.get("x", 400)
y = data.get("y", 300)
radius = data.get("radius", 30)
result = manager.add_obstacle(x, y, radius)
await websocket.send_json({
"type": MessageType.OBSTACLE_ADDED,
**result
})
return True
elif msg_type == MessageType.REMOVE_OBSTACLE:
index = data.get("index", -1)
success = manager.remove_obstacle(index)
await websocket.send_json({
"type": MessageType.OBSTACLE_REMOVED,
"index": index,
"success": success
})
return True
elif msg_type == MessageType.CLEAR_OBSTACLES:
count = manager.clear_obstacles()
await websocket.send_json({
"type": MessageType.OBSTACLES_CLEARED,
"count": count
})
return True
return False
# =============================================================================
# WebSocket Endpoint
# =============================================================================
@app.websocket("/ws")
async def websocket_endpoint(websocket: WebSocket):
"""
WebSocket endpoint for simulation streaming.
"""
manager = await connection_manager.connect(websocket)
frame_interval = 1.0 / TARGET_FPS
running = True
async def send_frames():
"""Continuously send frame data."""
nonlocal running
try:
while running:
frame_start = asyncio.get_event_loop().time()
manager.update()
frame_data = manager.get_frame_data()
await websocket.send_json(frame_data.model_dump())
frame_end = asyncio.get_event_loop().time()
elapsed = frame_end - frame_start
sleep_time = frame_interval - elapsed
if sleep_time > 0:
await asyncio.sleep(sleep_time)
except Exception as e:
print(f"Send frames error: {e}")
running = False
async def receive_messages():
"""Receive and handle client messages."""
nonlocal running
try:
while running:
data = await websocket.receive_json()
await handle_message(websocket, manager, data)
except WebSocketDisconnect:
running = False
except Exception as e:
print(f"Receive messages error: {e}")
running = False
try:
# Send initial params sync
sync = ParamsSyncMessage(params=manager.get_params_dict())
await websocket.send_json(sync.model_dump())
# Run send and receive concurrently
send_task = asyncio.create_task(send_frames())
receive_task = asyncio.create_task(receive_messages())
done, pending = await asyncio.wait(
[send_task, receive_task],
return_when=asyncio.FIRST_COMPLETED
)
running = False
for task in pending:
task.cancel()
try:
await task
except asyncio.CancelledError:
pass
except WebSocketDisconnect:
pass
except Exception as e:
print(f"WebSocket error: {e}")
finally:
connection_manager.disconnect(websocket)
# =============================================================================
# Main Entry Point
# =============================================================================
if __name__ == "__main__":
import uvicorn
uvicorn.run(app, host="0.0.0.0", port=8000)
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