638 lines
No EOL
26 KiB
Python
638 lines
No EOL
26 KiB
Python
"""
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WebSocket handler module.
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This module manages WebSocket connections, message processing, heartbeat functionality,
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and coordination between stream processing and detection pipelines.
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"""
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import asyncio
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import json
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import logging
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import time
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import traceback
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import uuid
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from typing import Dict, Any, Optional, Callable, List, Set
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from contextlib import asynccontextmanager
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from fastapi import WebSocket
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from fastapi.websockets import WebSocketDisconnect
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from websockets.exceptions import ConnectionClosedError
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from ..core.config import config, subscription_to_camera, latest_frames
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from ..core.constants import HEARTBEAT_INTERVAL
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from ..core.exceptions import WebSocketError, StreamError
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from ..streams.stream_manager import StreamManager
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from ..streams.camera_monitor import CameraMonitor
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from ..detection.detection_result import DetectionResult
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from ..models.model_manager import ModelManager
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from ..pipeline.pipeline_executor import PipelineExecutor
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from ..storage.session_cache import SessionCacheManager
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from ..storage.redis_client import RedisClientManager
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from ..utils.system_monitor import get_system_metrics
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# Setup logging
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logger = logging.getLogger("detector_worker.websocket_handler")
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ws_logger = logging.getLogger("websocket")
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ws_rxtx_logger = logging.getLogger("websocket.rxtx") # Dedicated RX/TX logger
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# Type definitions for callbacks
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MessageHandler = Callable[[Dict[str, Any]], asyncio.coroutine]
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DetectionHandler = Callable[[str, Dict[str, Any], Any, WebSocket, Any, Dict[str, Any]], asyncio.coroutine]
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class WebSocketHandler:
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"""
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Manages WebSocket connections and message processing for the detection worker.
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This class handles:
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- WebSocket lifecycle management
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- Message routing and processing
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- Heartbeat/state reporting
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- Stream subscription management
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- Detection result forwarding
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- Session management
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"""
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def __init__(
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self,
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stream_manager: StreamManager,
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model_manager: ModelManager,
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pipeline_executor: PipelineExecutor,
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session_cache: SessionCacheManager,
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redis_client: Optional[RedisClientManager] = None
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):
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"""
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Initialize the WebSocket handler.
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Args:
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stream_manager: Manager for camera streams
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model_manager: Manager for ML models
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pipeline_executor: Pipeline execution engine
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session_cache: Session state cache
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redis_client: Optional Redis client for pub/sub
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"""
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self.stream_manager = stream_manager
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self.model_manager = model_manager
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self.pipeline_executor = pipeline_executor
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self.session_cache = session_cache
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self.redis_client = redis_client
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# Connection state
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self.websocket: Optional[WebSocket] = None
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self.connected: bool = False
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self.tasks: List[asyncio.Task] = []
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# Message handlers
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self.message_handlers: Dict[str, MessageHandler] = {
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"subscribe": self._handle_subscribe,
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"unsubscribe": self._handle_unsubscribe,
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"requestState": self._handle_request_state,
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"setSessionId": self._handle_set_session,
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"patchSession": self._handle_patch_session,
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"setProgressionStage": self._handle_set_progression_stage
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}
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# Session and display management
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self.session_ids: Dict[str, str] = {} # display_identifier -> session_id
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self.display_identifiers: Set[str] = set()
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# Camera monitor
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self.camera_monitor = CameraMonitor()
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async def handle_connection(self, websocket: WebSocket) -> None:
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"""
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Main entry point for handling a WebSocket connection.
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Args:
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websocket: The WebSocket connection to handle
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"""
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try:
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await websocket.accept()
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self.websocket = websocket
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self.connected = True
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# Log connection details
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client_host = getattr(websocket.client, 'host', 'unknown')
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client_port = getattr(websocket.client, 'port', 'unknown')
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logger.info(f"🔗 WebSocket connection accepted from {client_host}:{client_port}")
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ws_rxtx_logger.info(f"CONNECT -> Client: {client_host}:{client_port}")
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# Create concurrent tasks
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stream_task = asyncio.create_task(self._process_streams())
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heartbeat_task = asyncio.create_task(self._send_heartbeat())
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message_task = asyncio.create_task(self._process_messages())
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self.tasks = [stream_task, heartbeat_task, message_task]
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# Wait for tasks to complete
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await asyncio.gather(heartbeat_task, message_task)
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except Exception as e:
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logger.error(f"Error in WebSocket handler: {e}")
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finally:
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self.connected = False
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client_host = getattr(websocket.client, 'host', 'unknown') if websocket.client else 'unknown'
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client_port = getattr(websocket.client, 'port', 'unknown') if websocket.client else 'unknown'
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ws_rxtx_logger.info(f"DISCONNECT -> Client: {client_host}:{client_port}")
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await self._cleanup()
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async def _cleanup(self) -> None:
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"""Clean up resources when connection closes."""
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logger.info("Cleaning up WebSocket connection")
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# Cancel all tasks
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for task in self.tasks:
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task.cancel()
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try:
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await task
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except asyncio.CancelledError:
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pass
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# Clean up streams
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await self.stream_manager.cleanup_all_streams()
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# Clean up models
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self.model_manager.cleanup_all_models()
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# Clear session state
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self.session_cache.clear_all_sessions()
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self.session_ids.clear()
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self.display_identifiers.clear()
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# Clear camera states
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self.camera_monitor.clear_all_states()
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logger.info("WebSocket cleanup completed")
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async def _send_heartbeat(self) -> None:
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"""Send periodic heartbeat/state reports to maintain connection."""
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while self.connected:
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try:
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# Get system metrics
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metrics = get_system_metrics()
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# Get active streams info
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active_streams = self.stream_manager.get_active_streams()
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active_models = self.model_manager.get_loaded_models()
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state_data = {
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"type": "stateReport",
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"timestamp": time.strftime("%Y-%m-%dT%H:%M:%SZ", time.gmtime()),
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"data": {
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"activeStreams": len(active_streams),
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"loadedModels": len(active_models),
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"cpuUsage": metrics.get("cpu_percent", 0),
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"memoryUsage": metrics.get("memory_percent", 0),
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"gpuUsage": metrics.get("gpu_percent", 0),
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"gpuMemory": metrics.get("gpu_memory_percent", 0),
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"uptime": time.time() - metrics.get("start_time", time.time())
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}
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}
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# Compact JSON for RX/TX logging
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compact_json = json.dumps(state_data, separators=(',', ':'))
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ws_rxtx_logger.info(f"TX -> {compact_json}")
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await self.websocket.send_json(state_data)
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await asyncio.sleep(HEARTBEAT_INTERVAL)
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except (WebSocketDisconnect, ConnectionClosedError):
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logger.info("WebSocket disconnected during heartbeat")
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break
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except Exception as e:
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logger.error(f"Error sending heartbeat: {e}")
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break
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async def _process_messages(self) -> None:
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"""Process incoming WebSocket messages."""
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while self.connected:
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try:
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text_data = await self.websocket.receive_text()
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ws_rxtx_logger.info(f"RX <- {text_data}")
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data = json.loads(text_data)
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msg_type = data.get("type")
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# Log message processing
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logger.debug(f"📥 Processing message type: {msg_type}")
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if msg_type in self.message_handlers:
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handler = self.message_handlers[msg_type]
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await handler(data)
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logger.debug(f"✅ Message {msg_type} processed successfully")
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else:
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logger.error(f"❌ Unknown message type: {msg_type}")
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ws_rxtx_logger.error(f"UNKNOWN_MSG_TYPE -> {msg_type}")
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except json.JSONDecodeError:
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logger.error("Received invalid JSON message")
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except (WebSocketDisconnect, ConnectionClosedError) as e:
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logger.warning(f"WebSocket disconnected: {e}")
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break
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except Exception as e:
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logger.error(f"Error handling message: {e}")
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traceback.print_exc()
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break
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async def _process_streams(self) -> None:
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"""Process active camera streams and run detection pipelines."""
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while self.connected:
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try:
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active_streams = self.stream_manager.get_active_streams()
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if active_streams:
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# Process each active stream
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tasks = []
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for camera_id, stream_info in active_streams.items():
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# Get latest frame
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frame = self.stream_manager.get_latest_frame(camera_id)
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if frame is None:
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continue
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# Get model for this camera
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model_id = stream_info.get("modelId")
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if not model_id:
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continue
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model_tree = self.model_manager.get_model(camera_id, model_id)
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if not model_tree:
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continue
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# Create detection task
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persistent_data = self.session_cache.get_persistent_data(camera_id)
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task = asyncio.create_task(
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self._handle_detection(
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camera_id, stream_info, frame,
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self.websocket, model_tree, persistent_data
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)
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)
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tasks.append(task)
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# Wait for all detection tasks
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if tasks:
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results = await asyncio.gather(*tasks, return_exceptions=True)
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# Update persistent data
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for i, (camera_id, _) in enumerate(active_streams.items()):
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if i < len(results) and isinstance(results[i], dict):
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self.session_cache.update_persistent_data(camera_id, results[i])
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# Polling interval
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poll_interval = config.get("poll_interval_ms", 100) / 1000.0
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await asyncio.sleep(poll_interval)
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except asyncio.CancelledError:
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logger.info("Stream processing cancelled")
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break
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except Exception as e:
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logger.error(f"Error in stream processing: {e}")
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await asyncio.sleep(1)
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async def _handle_detection(
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self,
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camera_id: str,
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stream_info: Dict[str, Any],
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frame: Any,
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websocket: WebSocket,
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model_tree: Any,
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persistent_data: Dict[str, Any]
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) -> Dict[str, Any]:
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"""
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Handle detection for a single camera frame.
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Args:
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camera_id: Camera identifier
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stream_info: Stream configuration
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frame: Video frame to process
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websocket: WebSocket connection
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model_tree: Model pipeline tree
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persistent_data: Persistent data for this camera
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Returns:
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Updated persistent data
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"""
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try:
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# Check camera connection state
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if self.camera_monitor.should_notify_disconnection(camera_id):
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await self._send_disconnection_notification(camera_id, stream_info)
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return persistent_data
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# Apply crop if specified
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cropped_frame = self._apply_crop(frame, stream_info)
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# Get session pipeline state
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pipeline_state = self.session_cache.get_session_pipeline_state(camera_id)
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# Run detection pipeline
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detection_result = await self.pipeline_executor.execute_pipeline(
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camera_id,
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stream_info,
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cropped_frame,
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model_tree,
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persistent_data,
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pipeline_state
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)
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# Send detection result
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if detection_result:
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await self._send_detection_result(
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camera_id, stream_info, detection_result
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)
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# Handle camera reconnection
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if self.camera_monitor.should_notify_reconnection(camera_id):
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self.camera_monitor.mark_reconnection_notified(camera_id)
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logger.info(f"Camera {camera_id} reconnected successfully")
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return persistent_data
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except Exception as e:
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logger.error(f"Error in detection handling for camera {camera_id}: {e}")
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traceback.print_exc()
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return persistent_data
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async def _handle_subscribe(self, data: Dict[str, Any]) -> None:
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"""Handle stream subscription request."""
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payload = data.get("payload", {})
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subscription_id = payload.get("subscriptionIdentifier")
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if not subscription_id:
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logger.error("Missing subscriptionIdentifier in subscribe payload")
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return
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try:
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# Extract display and camera IDs
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parts = subscription_id.split(";")
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if len(parts) >= 2:
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display_id = parts[0]
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camera_id = parts[1]
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self.display_identifiers.add(display_id)
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else:
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camera_id = subscription_id
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# Store subscription mapping
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subscription_to_camera[subscription_id] = camera_id
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# Start camera stream
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await self.stream_manager.start_stream(camera_id, payload)
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# Load model
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model_id = payload.get("modelId")
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model_url = payload.get("modelUrl")
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if model_id and model_url:
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await self.model_manager.load_model(camera_id, model_id, model_url)
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logger.info(f"Subscribed to stream: {subscription_id}")
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except Exception as e:
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logger.error(f"Error handling subscription: {e}")
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traceback.print_exc()
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async def _handle_unsubscribe(self, data: Dict[str, Any]) -> None:
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"""Handle stream unsubscription request."""
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payload = data.get("payload", {})
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subscription_id = payload.get("subscriptionIdentifier")
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if not subscription_id:
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logger.error("Missing subscriptionIdentifier in unsubscribe payload")
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return
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try:
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# Get camera ID from subscription
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camera_id = subscription_to_camera.get(subscription_id)
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if not camera_id:
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logger.warning(f"No camera found for subscription: {subscription_id}")
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return
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# Stop stream
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await self.stream_manager.stop_stream(camera_id)
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# Unload model
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self.model_manager.unload_models(camera_id)
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# Clean up mappings
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subscription_to_camera.pop(subscription_id, None)
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# Clean up session state
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self.session_cache.clear_session(camera_id)
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logger.info(f"Unsubscribed from stream: {subscription_id}")
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except Exception as e:
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logger.error(f"Error handling unsubscription: {e}")
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traceback.print_exc()
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async def _handle_request_state(self, data: Dict[str, Any]) -> None:
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"""Handle state request message."""
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# Send immediate state report
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await self._send_heartbeat()
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async def _handle_set_session(self, data: Dict[str, Any]) -> None:
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"""Handle setSessionId message."""
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payload = data.get("payload", {})
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display_id = payload.get("displayIdentifier")
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session_id = payload.get("sessionId")
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if display_id and session_id:
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self.session_ids[display_id] = session_id
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# Update session for all cameras of this display
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with self.stream_manager.streams_lock:
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for camera_id, stream in self.stream_manager.streams.items():
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if stream["subscriptionIdentifier"].startswith(display_id + ";"):
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self.session_cache.update_session_id(camera_id, session_id)
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# Send acknowledgment
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response = {
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"type": "ack",
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"requestId": data.get("requestId", str(uuid.uuid4())),
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"code": "200",
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"data": {
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"message": f"Session ID set for display {display_id}",
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"sessionId": session_id
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}
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}
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ws_rxtx_logger.info(f"TX -> {json.dumps(response, separators=(',', ':'))}")
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await self.websocket.send_json(response)
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logger.info(f"Set session {session_id} for display {display_id}")
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async def _handle_patch_session(self, data: Dict[str, Any]) -> None:
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"""Handle patchSession message."""
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payload = data.get("payload", {})
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session_id = payload.get("sessionId")
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patch_data = payload.get("data", {})
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if session_id:
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# Store patch data (could be used for session updates)
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logger.info(f"Received patch for session {session_id}: {patch_data}")
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# Send acknowledgment
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response = {
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"type": "ack",
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"requestId": data.get("requestId", str(uuid.uuid4())),
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"code": "200",
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"data": {
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"message": f"Session {session_id} patched successfully",
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"sessionId": session_id,
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"patchData": patch_data
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}
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}
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ws_rxtx_logger.info(f"TX -> {json.dumps(response, separators=(',', ':'))}")
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await self.websocket.send_json(response)
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async def _handle_set_progression_stage(self, data: Dict[str, Any]) -> None:
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"""Handle setProgressionStage message."""
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payload = data.get("payload", {})
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display_id = payload.get("displayIdentifier")
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progression_stage = payload.get("progressionStage")
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logger.info(f"🏁 PROGRESSION STAGE RECEIVED: displayId={display_id}, stage={progression_stage}")
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if not display_id:
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logger.warning("Missing displayIdentifier in setProgressionStage")
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return
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# Find all cameras for this display
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affected_cameras = []
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with self.stream_manager.streams_lock:
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for camera_id, stream in self.stream_manager.streams.items():
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if stream["subscriptionIdentifier"].startswith(display_id + ";"):
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affected_cameras.append(camera_id)
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logger.debug(f"🎯 Found {len(affected_cameras)} cameras for display {display_id}: {affected_cameras}")
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# Update progression stage for each camera
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for camera_id in affected_cameras:
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pipeline_state = self.session_cache.get_or_init_session_pipeline_state(camera_id)
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current_mode = pipeline_state.get("mode", "validation_detecting")
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if progression_stage == "car_fueling":
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# Stop YOLO inference during fueling
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if current_mode == "lightweight":
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pipeline_state["yolo_inference_enabled"] = False
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pipeline_state["progression_stage"] = "car_fueling"
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logger.info(f"⏸️ Camera {camera_id}: YOLO inference DISABLED for car_fueling stage")
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else:
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logger.debug(f"📊 Camera {camera_id}: car_fueling received but not in lightweight mode (mode: {current_mode})")
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elif progression_stage == "car_waitpayment":
|
|
# Resume YOLO inference for absence counter
|
|
pipeline_state["yolo_inference_enabled"] = True
|
|
pipeline_state["progression_stage"] = "car_waitpayment"
|
|
logger.info(f"▶️ Camera {camera_id}: YOLO inference RE-ENABLED for car_waitpayment stage")
|
|
|
|
elif progression_stage == "welcome":
|
|
# Ignore welcome messages during car_waitpayment
|
|
current_progression = pipeline_state.get("progression_stage")
|
|
if current_progression == "car_waitpayment":
|
|
logger.info(f"🚫 Camera {camera_id}: IGNORING welcome stage (currently in car_waitpayment)")
|
|
else:
|
|
pipeline_state["progression_stage"] = "welcome"
|
|
logger.info(f"🎉 Camera {camera_id}: Progression stage set to welcome")
|
|
|
|
elif progression_stage in ["car_wait_staff"]:
|
|
pipeline_state["progression_stage"] = progression_stage
|
|
logger.info(f"📋 Camera {camera_id}: Progression stage set to {progression_stage}")
|
|
|
|
async def _send_detection_result(
|
|
self,
|
|
camera_id: str,
|
|
stream_info: Dict[str, Any],
|
|
detection_result: DetectionResult
|
|
) -> None:
|
|
"""Send detection result over WebSocket."""
|
|
detection_data = {
|
|
"type": "imageDetection",
|
|
"subscriptionIdentifier": stream_info["subscriptionIdentifier"],
|
|
"timestamp": time.strftime("%Y-%m-%dT%H:%M:%SZ", time.gmtime()),
|
|
"data": {
|
|
"detection": detection_result.to_dict(),
|
|
"modelId": stream_info["modelId"],
|
|
"modelName": stream_info["modelName"]
|
|
}
|
|
}
|
|
|
|
try:
|
|
ws_rxtx_logger.info(f"TX -> {json.dumps(detection_data, separators=(',', ':'))}")
|
|
await self.websocket.send_json(detection_data)
|
|
except RuntimeError as e:
|
|
if "websocket.close" in str(e):
|
|
logger.warning(f"WebSocket closed - cannot send detection for camera {camera_id}")
|
|
else:
|
|
raise
|
|
|
|
async def _send_disconnection_notification(
|
|
self,
|
|
camera_id: str,
|
|
stream_info: Dict[str, Any]
|
|
) -> None:
|
|
"""Send camera disconnection notification."""
|
|
logger.error(f"🚨 CAMERA DISCONNECTION DETECTED: {camera_id} - sending immediate detection: null")
|
|
|
|
# Clear cached data
|
|
self.session_cache.clear_session(camera_id)
|
|
|
|
# Send null detection
|
|
detection_data = {
|
|
"type": "imageDetection",
|
|
"subscriptionIdentifier": stream_info["subscriptionIdentifier"],
|
|
"timestamp": time.strftime("%Y-%m-%dT%H:%M:%SZ", time.gmtime()),
|
|
"data": {
|
|
"detection": None,
|
|
"modelId": stream_info["modelId"],
|
|
"modelName": stream_info["modelName"]
|
|
}
|
|
}
|
|
|
|
try:
|
|
ws_rxtx_logger.info(f"TX -> {json.dumps(detection_data, separators=(',', ':'))}")
|
|
await self.websocket.send_json(detection_data)
|
|
except RuntimeError as e:
|
|
if "websocket.close" in str(e):
|
|
logger.warning(f"WebSocket closed - cannot send disconnection signal for camera {camera_id}")
|
|
else:
|
|
raise
|
|
|
|
self.camera_monitor.mark_disconnection_notified(camera_id)
|
|
logger.info(f"📡 SENT DISCONNECTION SIGNAL - detection: null for camera {camera_id}, backend should clear session")
|
|
|
|
def _apply_crop(self, frame: Any, stream_info: Dict[str, Any]) -> Any:
|
|
"""Apply crop to frame if crop coordinates are specified."""
|
|
crop_coords = [
|
|
stream_info.get("cropX1"),
|
|
stream_info.get("cropY1"),
|
|
stream_info.get("cropX2"),
|
|
stream_info.get("cropY2")
|
|
]
|
|
|
|
if all(coord is not None for coord in crop_coords):
|
|
x1, y1, x2, y2 = crop_coords
|
|
return frame[y1:y2, x1:x2]
|
|
|
|
return frame
|
|
|
|
|
|
# Convenience function for backward compatibility
|
|
async def handle_websocket_connection(
|
|
websocket: WebSocket,
|
|
stream_manager: StreamManager,
|
|
model_manager: ModelManager,
|
|
pipeline_executor: PipelineExecutor,
|
|
session_cache: SessionCacheManager,
|
|
redis_client: Optional[RedisClientManager] = None
|
|
) -> None:
|
|
"""
|
|
Handle a WebSocket connection using the WebSocketHandler.
|
|
|
|
This is a convenience function that creates a handler instance
|
|
and processes the connection.
|
|
"""
|
|
handler = WebSocketHandler(
|
|
stream_manager,
|
|
model_manager,
|
|
pipeline_executor,
|
|
session_cache,
|
|
redis_client
|
|
)
|
|
await handler.handle_connection(websocket) |