PingWatch 网络设备离线监控系统

- FastAPI 后端 + Vue 3 前端
- Docker Compose 一键部署
- Casdoor OAuth 认证集成
- LogHive 集中式日志
- 设备批量 CSV 导入/导出
- WebSocket 实时状态推送
- 企业微信告警通知
- fping 高性能并发 Ping 检测

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

backend/app/api/ws.py

@@ -0,0 +1,70 @@
+"""WebSocket 实时推送"""
+import json
+import asyncio
+import logging
+
+from fastapi import APIRouter, WebSocket, WebSocketDisconnect
+
+logger = logging.getLogger("pingwatch.ws")
+
+router = APIRouter()
+
+
+class ConnectionManager:
+    """WebSocket 连接管理器"""
+
+    def __init__(self):
+        self._connections: set[WebSocket] = set()
+
+    async def connect(self, ws: WebSocket):
+        await ws.accept()
+        self._connections.add(ws)
+
+    def disconnect(self, ws: WebSocket):
+        self._connections.discard(ws)
+
+    async def broadcast(self, message: dict):
+        """向所有客户端广播消息"""
+        dead = set()
+        for ws in self._connections:
+            try:
+                await ws.send_json(message)
+            except Exception:
+                dead.add(ws)
+        self._connections -= dead
+
+    @property
+    def count(self) -> int:
+        return len(self._connections)
+
+
+manager = ConnectionManager()
+
+
+@router.websocket("/ws")
+async def websocket_endpoint(ws: WebSocket):
+    """WebSocket 端点，用于前端实时接收状态更新"""
+    await manager.connect(ws)
+    try:
+        while True:
+            # 保持连接，接收心跳 pong
+            data = await ws.receive_text()
+            if data == "ping":
+                await ws.send_text("pong")
+    except WebSocketDisconnect:
+        pass
+    except Exception as e:
+        logger.error(f"WebSocket 异常: {e}")
+    finally:
+        manager.disconnect(ws)
+
+
+async def broadcast_status_change(device_id: int, status: str, name: str):
+    """广播设备状态变化"""
+    await manager.broadcast({
+        "type": "device_status_change",
+        "device_id": device_id,
+        "status": status,
+        "name": name,
+        "timestamp": asyncio.get_event_loop().time(),
+    })