mirror of
https://github.com/varun-r-mallya/py-libp2p.git
synced 2025-12-31 20:36:24 +00:00
136 lines
3.7 KiB
Python
136 lines
3.7 KiB
Python
"""
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QUIC Stream implementation
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"""
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from types import (
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TracebackType,
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)
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from typing import TYPE_CHECKING, cast
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import trio
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if TYPE_CHECKING:
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from libp2p.abc import IMuxedStream
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from .connection import QUICConnection
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else:
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IMuxedStream = cast(type, object)
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from .exceptions import (
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QUICStreamError,
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)
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class QUICStream(IMuxedStream):
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"""
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Basic QUIC stream implementation for Module 1.
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This is a minimal implementation to make Module 1 self-contained.
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Will be moved to a separate stream.py module in Module 3.
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"""
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def __init__(
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self, connection: "QUICConnection", stream_id: int, is_initiator: bool
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):
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self._connection = connection
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self._stream_id = stream_id
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self._is_initiator = is_initiator
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self._closed = False
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# Trio synchronization
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self._receive_buffer = bytearray()
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self._receive_event = trio.Event()
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self._close_event = trio.Event()
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async def read(self, n: int | None = -1) -> bytes:
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"""Read data from the stream."""
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if self._closed:
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raise QUICStreamError("Stream is closed")
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# Wait for data if buffer is empty
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while not self._receive_buffer and not self._closed:
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await self._receive_event.wait()
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self._receive_event = trio.Event() # Reset for next read
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if n == -1:
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data = bytes(self._receive_buffer)
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self._receive_buffer.clear()
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else:
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data = bytes(self._receive_buffer[:n])
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self._receive_buffer = self._receive_buffer[n:]
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return data
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async def write(self, data: bytes) -> None:
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"""Write data to the stream."""
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if self._closed:
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raise QUICStreamError("Stream is closed")
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# Send data using the underlying QUIC connection
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self._connection._quic.send_stream_data(self._stream_id, data)
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await self._connection._transmit()
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async def close(self, error_code: int = 0) -> None:
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"""Close the stream."""
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if self._closed:
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return
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self._closed = True
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# Close the QUIC stream
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self._connection._quic.reset_stream(self._stream_id, error_code)
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await self._connection._transmit()
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# Remove from connection's stream list
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self._connection._streams.pop(self._stream_id, None)
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self._close_event.set()
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def is_closed(self) -> bool:
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"""Check if stream is closed."""
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return self._closed
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async def handle_data_received(self, data: bytes, end_stream: bool) -> None:
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"""Handle data received from the QUIC connection."""
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if self._closed:
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return
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self._receive_buffer.extend(data)
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self._receive_event.set()
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if end_stream:
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await self.close()
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async def handle_reset(self, error_code: int) -> None:
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"""Handle stream reset."""
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self._closed = True
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self._close_event.set()
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def set_deadline(self, ttl: int) -> bool:
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"""
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Set the deadline
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"""
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raise NotImplementedError("Yamux does not support setting read deadlines")
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async def reset(self) -> None:
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"""
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Reset the stream
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"""
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self.handle_reset(0)
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def get_remote_address(self) -> tuple[str, int] | None:
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return self._connection._remote_addr
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async def __aenter__(self) -> "QUICStream":
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"""Enter the async context manager."""
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return self
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async def __aexit__(
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self,
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exc_type: type[BaseException] | None,
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exc_val: BaseException | None,
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exc_tb: TracebackType | None,
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) -> None:
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"""Exit the async context manager and close the stream."""
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await self.close()
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