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67 lines
1.9 KiB
67 lines
1.9 KiB
import asyncio
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from .log import internal_logger
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class BaseProtocol(asyncio.Protocol):
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__slots__ = ('_loop', '_paused', '_drain_waiter',
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'_connection_lost', 'transport')
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def __init__(self, loop=None):
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if loop is None:
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self._loop = asyncio.get_event_loop()
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else:
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self._loop = loop
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self._paused = False
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self._drain_waiter = None
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self._connection_lost = False
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self.transport = None
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def pause_writing(self):
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assert not self._paused
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self._paused = True
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if self._loop.get_debug():
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internal_logger.debug("%r pauses writing", self)
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def resume_writing(self):
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assert self._paused
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self._paused = False
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if self._loop.get_debug():
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internal_logger.debug("%r resumes writing", self)
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waiter = self._drain_waiter
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if waiter is not None:
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self._drain_waiter = None
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if not waiter.done():
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waiter.set_result(None)
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def connection_made(self, transport):
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self.transport = transport
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def connection_lost(self, exc):
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self._connection_lost = True
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# Wake up the writer if currently paused.
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self.transport = None
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if not self._paused:
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return
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waiter = self._drain_waiter
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if waiter is None:
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return
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self._drain_waiter = None
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if waiter.done():
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return
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if exc is None:
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waiter.set_result(None)
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else:
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waiter.set_exception(exc)
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async def _drain_helper(self):
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if self._connection_lost:
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raise ConnectionResetError('Connection lost')
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if not self._paused:
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return
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waiter = self._drain_waiter
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assert waiter is None or waiter.cancelled()
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waiter = self._loop.create_future()
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self._drain_waiter = waiter
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await waiter
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