""" WebSocket display backend - broadcasts frame buffer to connected web clients. """ import asyncio import json import threading import time from typing import Protocol try: import websockets except ImportError: websockets = None class Display(Protocol): """Protocol for display backends.""" width: int height: int def init(self, width: int, height: int) -> None: """Initialize display with dimensions.""" ... def show(self, buffer: list[str]) -> None: """Show buffer on display.""" ... def clear(self) -> None: """Clear display.""" ... def cleanup(self) -> None: """Shutdown display.""" ... def get_monitor(): """Get the performance monitor.""" try: from engine.effects.performance import get_monitor as _get_monitor return _get_monitor() except Exception: return None class WebSocketDisplay: """WebSocket display backend - broadcasts to HTML Canvas clients.""" width: int = 80 height: int = 24 def __init__( self, host: str = "0.0.0.0", port: int = 8765, http_port: int = 8766, ): self.host = host self.port = port self.http_port = http_port self.width = 80 self.height = 24 self._clients: set = set() self._server_running = False self._http_running = False self._server_thread: threading.Thread | None = None self._http_thread: threading.Thread | None = None self._available = True self._max_clients = 10 self._client_connected_callback = None self._client_disconnected_callback = None self._frame_delay = 0.0 try: import websockets as _ws self._available = _ws is not None except ImportError: self._available = False def is_available(self) -> bool: """Check if WebSocket support is available.""" return self._available def init(self, width: int, height: int, reuse: bool = False) -> None: """Initialize display with dimensions and start server. Args: width: Terminal width in characters height: Terminal height in rows reuse: If True, skip starting servers (assume already running) """ self.width = width self.height = height if not reuse or not self._server_running: self.start_server() self.start_http_server() def show(self, buffer: list[str], border: bool = False) -> None: """Broadcast buffer to all connected clients.""" t0 = time.perf_counter() # Get metrics for border display fps = 0.0 frame_time = 0.0 monitor = get_monitor() if monitor: stats = monitor.get_stats() avg_ms = stats.get("avg_ms", 0) if stats else 0 frame_count = stats.get("frame_count", 0) if stats else 0 if avg_ms and frame_count > 0: fps = 1000.0 / avg_ms frame_time = avg_ms # Apply border if requested if border: from engine.display import render_border buffer = render_border(buffer, self.width, self.height, fps, frame_time) if self._clients: frame_data = { "type": "frame", "width": self.width, "height": self.height, "lines": buffer, } message = json.dumps(frame_data) disconnected = set() for client in list(self._clients): try: asyncio.run(client.send(message)) except Exception: disconnected.add(client) for client in disconnected: self._clients.discard(client) if self._client_disconnected_callback: self._client_disconnected_callback(client) elapsed_ms = (time.perf_counter() - t0) * 1000 monitor = get_monitor() if monitor: chars_in = sum(len(line) for line in buffer) monitor.record_effect("websocket_display", elapsed_ms, chars_in, chars_in) def clear(self) -> None: """Broadcast clear command to all clients.""" if self._clients: clear_data = {"type": "clear"} message = json.dumps(clear_data) for client in list(self._clients): try: asyncio.run(client.send(message)) except Exception: pass def cleanup(self) -> None: """Stop the servers.""" self.stop_server() self.stop_http_server() async def _websocket_handler(self, websocket): """Handle WebSocket connections.""" if len(self._clients) >= self._max_clients: await websocket.close() return self._clients.add(websocket) if self._client_connected_callback: self._client_connected_callback(websocket) try: async for message in websocket: try: data = json.loads(message) if data.get("type") == "resize": self.width = data.get("width", 80) self.height = data.get("height", 24) except json.JSONDecodeError: pass except Exception: pass finally: self._clients.discard(websocket) if self._client_disconnected_callback: self._client_disconnected_callback(websocket) async def _run_websocket_server(self): """Run the WebSocket server.""" async with websockets.serve(self._websocket_handler, self.host, self.port): while self._server_running: await asyncio.sleep(0.1) async def _run_http_server(self): """Run simple HTTP server for the client.""" import os from http.server import HTTPServer, SimpleHTTPRequestHandler client_dir = os.path.join( os.path.dirname(os.path.dirname(os.path.dirname(__file__))), "client" ) class Handler(SimpleHTTPRequestHandler): def __init__(self, *args, **kwargs): super().__init__(*args, directory=client_dir, **kwargs) def log_message(self, format, *args): pass httpd = HTTPServer((self.host, self.http_port), Handler) while self._http_running: httpd.handle_request() def _run_async(self, coro): """Run coroutine in background.""" try: asyncio.run(coro) except Exception as e: print(f"WebSocket async error: {e}") def start_server(self): """Start the WebSocket server in a background thread.""" if not self._available: return if self._server_thread is not None: return self._server_running = True self._server_thread = threading.Thread( target=self._run_async, args=(self._run_websocket_server(),), daemon=True ) self._server_thread.start() def stop_server(self): """Stop the WebSocket server.""" self._server_running = False self._server_thread = None def start_http_server(self): """Start the HTTP server in a background thread.""" if not self._available: return if self._http_thread is not None: return self._http_running = True self._http_running = True self._http_thread = threading.Thread( target=self._run_async, args=(self._run_http_server(),), daemon=True ) self._http_thread.start() def stop_http_server(self): """Stop the HTTP server.""" self._http_running = False self._http_thread = None def client_count(self) -> int: """Return number of connected clients.""" return len(self._clients) def get_ws_port(self) -> int: """Return WebSocket port.""" return self.port def get_http_port(self) -> int: """Return HTTP port.""" return self.http_port def set_frame_delay(self, delay: float) -> None: """Set delay between frames in seconds.""" self._frame_delay = delay def get_frame_delay(self) -> float: """Get delay between frames.""" return self._frame_delay def set_client_connected_callback(self, callback) -> None: """Set callback for client connections.""" self._client_connected_callback = callback def set_client_disconnected_callback(self, callback) -> None: """Set callback for client disconnections.""" self._client_disconnected_callback = callback def get_dimensions(self) -> tuple[int, int]: """Get current dimensions. Returns: (width, height) in character cells """ return (self.width, self.height)