228 lines
7.3 KiB
Python
228 lines
7.3 KiB
Python
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"""
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WebSocket endpoint for real-time data push.
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Provides instant updates to connected clients (BigScreen, dashboards)
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instead of relying solely on polling.
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"""
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import asyncio
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import logging
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from datetime import datetime, timedelta, timezone
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from typing import Optional
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from fastapi import APIRouter, WebSocket, WebSocketDisconnect, Query
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from sqlalchemy import select, func, and_
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from app.core.security import decode_access_token
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from app.core.database import async_session
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from app.models.device import Device
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from app.models.energy import EnergyData
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from app.models.alarm import AlarmEvent
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logger = logging.getLogger("app.websocket")
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router = APIRouter(tags=["WebSocket"])
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class ConnectionManager:
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"""Manages active WebSocket connections."""
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def __init__(self):
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self.active_connections: list[WebSocket] = []
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async def connect(self, websocket: WebSocket):
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await websocket.accept()
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self.active_connections.append(websocket)
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logger.info(f"WebSocket connected. Total: {len(self.active_connections)}")
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def disconnect(self, websocket: WebSocket):
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if websocket in self.active_connections:
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self.active_connections.remove(websocket)
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logger.info(f"WebSocket disconnected. Total: {len(self.active_connections)}")
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async def broadcast(self, message: dict):
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"""Send message to all connected clients, removing dead connections."""
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disconnected = []
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for connection in self.active_connections:
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try:
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await connection.send_json(message)
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except Exception:
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disconnected.append(connection)
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for conn in disconnected:
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self.disconnect(conn)
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manager = ConnectionManager()
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# Background task reference
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_broadcast_task: Optional[asyncio.Task] = None
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async def get_realtime_snapshot() -> dict:
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"""Fetch latest realtime data from the database.
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Mirrors the logic in dashboard.get_realtime_data:
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- Query recent power data points (last 5 min)
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- Aggregate by device type (PV inverters vs heat pumps)
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"""
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try:
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async with async_session() as db:
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now = datetime.now(timezone.utc)
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five_min_ago = now - timedelta(minutes=5)
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# Get recent power data points
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latest_q = await db.execute(
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select(EnergyData).where(
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and_(
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EnergyData.timestamp >= five_min_ago,
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EnergyData.data_type == "power",
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)
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).order_by(EnergyData.timestamp.desc()).limit(50)
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)
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data_points = latest_q.scalars().all()
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# Get PV and heat pump device IDs
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pv_q = await db.execute(
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select(Device.id).where(
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Device.device_type == "pv_inverter",
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Device.is_active == True,
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)
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)
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pv_ids = {r[0] for r in pv_q.fetchall()}
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hp_q = await db.execute(
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select(Device.id).where(
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Device.device_type == "heat_pump",
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Device.is_active == True,
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)
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)
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hp_ids = {r[0] for r in hp_q.fetchall()}
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pv_power = sum(d.value for d in data_points if d.device_id in pv_ids)
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heatpump_power = sum(d.value for d in data_points if d.device_id in hp_ids)
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total_load = pv_power + heatpump_power
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grid_power = max(0, heatpump_power - pv_power)
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# Count active alarms
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alarm_count_q = await db.execute(
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select(func.count(AlarmEvent.id)).where(
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AlarmEvent.status == 'active'
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)
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)
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active_alarms = alarm_count_q.scalar() or 0
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return {
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"pv_power": round(pv_power, 1),
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"heatpump_power": round(heatpump_power, 1),
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"total_load": round(total_load, 1),
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"grid_power": round(grid_power, 1),
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"active_alarms": active_alarms,
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"timestamp": now.isoformat(),
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}
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except Exception as e:
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logger.error(f"Error fetching realtime snapshot: {e}")
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return {
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"pv_power": 0,
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"heatpump_power": 0,
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"total_load": 0,
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"grid_power": 0,
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"active_alarms": 0,
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"timestamp": datetime.now(timezone.utc).isoformat(),
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}
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async def broadcast_loop():
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"""Background task: broadcast realtime data every 15 seconds."""
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while True:
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try:
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await asyncio.sleep(15)
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if manager.active_connections:
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data = await get_realtime_snapshot()
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await manager.broadcast({
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"type": "realtime_update",
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"data": data,
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})
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except asyncio.CancelledError:
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break
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except Exception as e:
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logger.error(f"Broadcast loop error: {e}")
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await asyncio.sleep(5)
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async def broadcast_alarm_event(alarm_data: dict):
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"""Called externally when a new alarm is triggered."""
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if manager.active_connections:
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await manager.broadcast({
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"type": "alarm_event",
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"data": alarm_data,
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})
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def start_broadcast_task():
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"""Start the background broadcast loop. Call during app startup."""
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global _broadcast_task
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if _broadcast_task is None or _broadcast_task.done():
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_broadcast_task = asyncio.create_task(broadcast_loop())
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logger.info("WebSocket broadcast task started")
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def stop_broadcast_task():
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"""Stop the background broadcast loop. Call during app shutdown."""
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global _broadcast_task
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if _broadcast_task and not _broadcast_task.done():
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_broadcast_task.cancel()
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logger.info("WebSocket broadcast task stopped")
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@router.websocket("/ws/realtime")
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async def websocket_realtime(
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websocket: WebSocket,
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token: str = Query(default=""),
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):
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"""
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WebSocket endpoint for real-time energy data.
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Connect with: ws://host/api/v1/ws/realtime?token=<jwt_token>
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Messages sent to clients:
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- type: "realtime_update" - periodic snapshot every 15s
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- type: "alarm_event" - when a new alarm triggers
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"""
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# Authenticate
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if not token:
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await websocket.close(code=4001, reason="Missing token")
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return
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payload = decode_access_token(token)
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if payload is None:
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await websocket.close(code=4001, reason="Invalid token")
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return
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await manager.connect(websocket)
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# Ensure broadcast task is running
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start_broadcast_task()
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# Send initial data immediately
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try:
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initial_data = await get_realtime_snapshot()
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await websocket.send_json({
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"type": "realtime_update",
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"data": initial_data,
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})
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except Exception as e:
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logger.error(f"Error sending initial data: {e}")
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# Keep connection alive and handle incoming messages
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try:
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while True:
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# Wait for any client message (ping/pong, or just keep alive)
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data = await websocket.receive_text()
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# Client can send "ping" to keep alive
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if data == "ping":
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await websocket.send_json({"type": "pong"})
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except WebSocketDisconnect:
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manager.disconnect(websocket)
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except Exception:
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manager.disconnect(websocket)
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