mirror of
https://github.com/varun-r-mallya/py-libp2p.git
synced 2025-12-31 20:36:24 +00:00
cdbd80eeba
- Combined yashksaini-coder's flow control improvements with luca's WSS features - Preserved comprehensive WSS support, TLS configuration, and handshake timeout - Added production-ready buffer management and connection limits - Maintained backward compatibility with existing WebSocket functionality - Integrated both approaches for optimal WebSocket transport implementation
199 lines
8.0 KiB
Python
199 lines
8.0 KiB
Python
import logging
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import time
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from typing import Any
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import trio
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from libp2p.io.abc import ReadWriteCloser
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from libp2p.io.exceptions import IOException
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logger = logging.getLogger(__name__)
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class P2PWebSocketConnection(ReadWriteCloser):
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"""
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Wraps a WebSocketConnection to provide the raw stream interface
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that libp2p protocols expect.
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Implements production-ready buffer management and flow control
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as recommended in the libp2p WebSocket specification.
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"""
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def __init__(
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self,
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ws_connection: Any,
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ws_context: Any = None,
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is_secure: bool = False,
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max_buffered_amount: int = 4 * 1024 * 1024,
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) -> None:
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self._ws_connection = ws_connection
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self._ws_context = ws_context
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self._is_secure = is_secure
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self._read_buffer = b""
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self._read_lock = trio.Lock()
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self._connection_start_time = time.time()
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self._bytes_read = 0
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self._bytes_written = 0
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self._closed = False
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self._close_lock = trio.Lock()
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self._max_buffered_amount = max_buffered_amount
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self._write_lock = trio.Lock()
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async def write(self, data: bytes) -> None:
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"""Write data with flow control and buffer management"""
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if self._closed:
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raise IOException("Connection is closed")
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async with self._write_lock:
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try:
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logger.debug(f"WebSocket writing {len(data)} bytes")
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# Check buffer amount for flow control
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if hasattr(self._ws_connection, "bufferedAmount"):
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buffered = self._ws_connection.bufferedAmount
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if buffered > self._max_buffered_amount:
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logger.warning(f"WebSocket buffer full: {buffered} bytes")
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# In production, you might want to
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# wait or implement backpressure
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# For now, we'll continue but log the warning
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# Send as a binary WebSocket message
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await self._ws_connection.send_message(data)
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self._bytes_written += len(data)
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logger.debug(f"WebSocket wrote {len(data)} bytes successfully")
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except Exception as e:
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logger.error(f"WebSocket write failed: {e}")
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self._closed = True
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raise IOException from e
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async def read(self, n: int | None = None) -> bytes:
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"""
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Read up to n bytes (if n is given), else read up to 64KiB.
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This implementation provides byte-level access to WebSocket messages,
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which is required for libp2p protocol compatibility.
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For WebSocket compatibility with libp2p protocols, this method:
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1. Buffers incoming WebSocket messages
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2. Returns exactly the requested number of bytes when n is specified
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3. Accumulates multiple WebSocket messages if needed to satisfy the request
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4. Returns empty bytes (not raises) when connection is closed and no data
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available
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"""
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if self._closed:
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raise IOException("Connection is closed")
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async with self._read_lock:
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try:
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# If n is None, read at least one message and return all buffered data
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if n is None:
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if not self._read_buffer:
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try:
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# Use a short timeout to avoid blocking indefinitely
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with trio.fail_after(1.0): # 1 second timeout
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message = await self._ws_connection.get_message()
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if isinstance(message, str):
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message = message.encode("utf-8")
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self._read_buffer = message
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except trio.TooSlowError:
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# No message available within timeout
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return b""
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except Exception:
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# Return empty bytes if no data available
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# (connection closed)
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return b""
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result = self._read_buffer
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self._read_buffer = b""
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self._bytes_read += len(result)
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return result
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# For specific byte count requests, return UP TO n bytes (not exactly n)
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# This matches TCP semantics where read(1024) returns available data
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# up to 1024 bytes
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# If we don't have any data buffered, try to get at least one message
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if not self._read_buffer:
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try:
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# Use a short timeout to avoid blocking indefinitely
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with trio.fail_after(1.0): # 1 second timeout
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message = await self._ws_connection.get_message()
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if isinstance(message, str):
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message = message.encode("utf-8")
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self._read_buffer = message
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except trio.TooSlowError:
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return b"" # No data available
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except Exception:
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return b""
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# Now return up to n bytes from the buffer (TCP-like semantics)
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if len(self._read_buffer) == 0:
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return b""
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# Return up to n bytes (like TCP read())
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result = self._read_buffer[:n]
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self._read_buffer = self._read_buffer[len(result) :]
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self._bytes_read += len(result)
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return result
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except Exception as e:
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logger.error(f"WebSocket read failed: {e}")
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raise IOException from e
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async def close(self) -> None:
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"""Close the WebSocket connection. This method is idempotent."""
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async with self._close_lock:
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if self._closed:
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return # Already closed
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logger.debug("WebSocket connection closing")
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self._closed = True
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try:
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# Always close the connection directly, avoid context manager issues
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# The context manager may be causing cancel scope corruption
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logger.debug("WebSocket closing connection directly")
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await self._ws_connection.aclose()
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# Exit the context manager if we have one
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if self._ws_context is not None:
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await self._ws_context.__aexit__(None, None, None)
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except Exception as e:
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logger.error(f"WebSocket close error: {e}")
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# Don't raise here, as close() should be idempotent
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finally:
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logger.debug("WebSocket connection closed")
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def is_closed(self) -> bool:
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"""Check if the connection is closed"""
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return self._closed
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def conn_state(self) -> dict[str, Any]:
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"""
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Return connection state information similar to Go's ConnState() method.
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:return: Dictionary containing connection state information
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"""
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current_time = time.time()
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return {
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"transport": "websocket",
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"secure": self._is_secure,
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"connection_duration": current_time - self._connection_start_time,
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"bytes_read": self._bytes_read,
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"bytes_written": self._bytes_written,
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"total_bytes": self._bytes_read + self._bytes_written,
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}
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def get_remote_address(self) -> tuple[str, int] | None:
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# Try to get remote address from the WebSocket connection
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try:
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remote = self._ws_connection.remote
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if hasattr(remote, "address") and hasattr(remote, "port"):
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return str(remote.address), int(remote.port)
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elif isinstance(remote, str):
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# Parse address:port format
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if ":" in remote:
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host, port = remote.rsplit(":", 1)
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return host, int(port)
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except Exception:
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pass
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return None
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