242 lines
8.3 KiB
Python
242 lines
8.3 KiB
Python
from __future__ import annotations
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import asyncio
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import sys
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from typing import Union, Optional
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from ._server import FakeBaseConnectionMixin
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if sys.version_info >= (3, 11):
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from asyncio import timeout as async_timeout
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else:
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from async_timeout import timeout as async_timeout
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import redis.asyncio as redis_async # aioredis was integrated into redis in version 4.2.0 as redis.asyncio
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from redis.asyncio.connection import DefaultParser
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from . import _fakesocket
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from . import _helpers
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from . import _msgs as msgs
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from . import _server
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class AsyncFakeSocket(_fakesocket.FakeSocket):
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_connection_error_class = redis_async.ConnectionError
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def __init__(self, *args, **kwargs):
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super().__init__(*args, **kwargs)
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self.responses = asyncio.Queue() # type:ignore
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def _decode_error(self, error):
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parser = DefaultParser(1)
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return parser.parse_error(error.value)
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def put_response(self, msg) -> None:
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if not self.responses:
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return
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self.responses.put_nowait(msg)
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async def _async_blocking(self, timeout, func, event, callback):
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result = None
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try:
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async with async_timeout(timeout if timeout else None):
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while True:
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await event.wait()
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event.clear()
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# This is a coroutine outside the normal control flow that
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# locks the server, so we have to take our own lock.
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with self._server.lock:
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ret = func(False)
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if ret is not None:
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result = self._decode_result(ret)
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self.put_response(result)
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break
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except asyncio.TimeoutError:
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pass
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finally:
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with self._server.lock:
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self._db.remove_change_callback(callback)
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self.put_response(result)
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self.resume()
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def _blocking(self, timeout, func):
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loop = asyncio.get_event_loop()
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ret = func(True)
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if ret is not None or self._in_transaction:
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return ret
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event = asyncio.Event()
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def callback():
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loop.call_soon_threadsafe(event.set)
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self._db.add_change_callback(callback)
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self.pause()
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loop.create_task(self._async_blocking(timeout, func, event, callback))
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return _helpers.NoResponse()
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class FakeReader:
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def __init__(self, socket: AsyncFakeSocket) -> None:
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self._socket = socket
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async def read(self, _: int) -> bytes:
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return await self._socket.responses.get() # type:ignore
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class FakeWriter:
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def __init__(self, socket: AsyncFakeSocket) -> None:
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self._socket: Optional[AsyncFakeSocket] = socket
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def close(self) -> None:
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self._socket = None
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async def wait_closed(self):
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pass
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async def drain(self):
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pass
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def writelines(self, data) -> None:
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if self._socket is None:
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return
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for chunk in data:
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self._socket.sendall(chunk)
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class FakeConnection(FakeBaseConnectionMixin, redis_async.Connection):
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async def _connect(self):
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if not self._server.connected:
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raise redis_async.ConnectionError(msgs.CONNECTION_ERROR_MSG)
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self._sock = AsyncFakeSocket(self._server, self.db)
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self._reader = FakeReader(self._sock)
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self._writer = FakeWriter(self._sock)
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async def disconnect(self, **kwargs):
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await super().disconnect(**kwargs)
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self._sock = None
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async def can_read(self, timeout: float = 0):
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if not self.is_connected:
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await self.connect()
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if timeout == 0:
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return self._sock is not None and not self._sock.responses.empty()
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# asyncio.Queue doesn't have a way to wait for the queue to be
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# non-empty without consuming an item, so kludge it with a sleep/poll
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# loop.
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loop = asyncio.get_event_loop()
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start = loop.time()
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while True:
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if self._sock and not self._sock.responses.empty():
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return True
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await asyncio.sleep(0.01)
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now = loop.time()
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if timeout is not None and now > start + timeout:
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return False
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def _decode(self, response):
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if isinstance(response, list):
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return [self._decode(item) for item in response]
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elif isinstance(response, bytes):
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return self.encoder.decode(
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response,
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)
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else:
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return response
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async def read_response(self, **kwargs):
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if not self._sock:
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raise redis_async.ConnectionError(msgs.CONNECTION_ERROR_MSG)
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if not self._server.connected:
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try:
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response = self._sock.responses.get_nowait()
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except asyncio.QueueEmpty:
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if kwargs.get("disconnect_on_error", True):
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await self.disconnect()
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raise redis_async.ConnectionError(msgs.CONNECTION_ERROR_MSG)
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else:
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timeout = kwargs.pop("timeout", None)
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can_read = await self.can_read(timeout)
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response = await self._reader.read(0) if can_read else None
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if isinstance(response, redis_async.ResponseError):
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raise response
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return self._decode(response)
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def repr_pieces(self):
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pieces = [("server", self._server), ("db", self.db)]
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if self.client_name:
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pieces.append(("client_name", self.client_name))
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return pieces
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def __str__(self):
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return self.server_key
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class FakeRedis(redis_async.Redis):
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def __init__(
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self,
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*,
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host: str = "localhost",
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port: int = 6379,
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db: Union[str, int] = 0,
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password: Optional[str] = None,
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socket_timeout: Optional[float] = None,
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connection_pool: Optional[redis_async.ConnectionPool] = None,
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encoding: str = "utf-8",
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encoding_errors: str = "strict",
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decode_responses: bool = False,
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retry_on_timeout: bool = False,
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max_connections: Optional[int] = None,
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health_check_interval: int = 0,
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client_name: Optional[str] = None,
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username: Optional[str] = None,
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server: Optional[_server.FakeServer] = None,
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connected: bool = True,
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version=(7,),
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**kwargs,
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):
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if not connection_pool:
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# Adapted from aioredis
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connection_kwargs = dict(
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host=host,
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port=port,
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db=db,
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# Ignoring because AUTH is not implemented
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# 'username',
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# 'password',
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socket_timeout=socket_timeout,
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encoding=encoding,
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encoding_errors=encoding_errors,
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decode_responses=decode_responses,
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retry_on_timeout=retry_on_timeout,
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health_check_interval=health_check_interval,
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client_name=client_name,
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server=server,
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connected=connected,
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connection_class=FakeConnection,
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max_connections=max_connections,
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version=version,
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)
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connection_pool = redis_async.ConnectionPool(**connection_kwargs)
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kwargs.update(dict(db=db,
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password=password,
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socket_timeout=socket_timeout,
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connection_pool=connection_pool,
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encoding=encoding,
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encoding_errors=encoding_errors,
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decode_responses=decode_responses,
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retry_on_timeout=retry_on_timeout,
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max_connections=max_connections,
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health_check_interval=health_check_interval,
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client_name=client_name,
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username=username))
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super().__init__(**kwargs)
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@classmethod
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def from_url(cls, url: str, **kwargs) -> redis_async.Redis:
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self = super().from_url(url, **kwargs)
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pool = self.connection_pool # Now override how it creates connections
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pool.connection_class = FakeConnection
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pool.connection_kwargs.pop("username", None)
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pool.connection_kwargs.pop("password", None)
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return self
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