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329 lines
9.7 KiB
329 lines
9.7 KiB
3 years ago
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# mysql/asyncmy.py
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# Copyright (C) 2005-2022 the SQLAlchemy authors and contributors <see AUTHORS
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# file>
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#
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# This module is part of SQLAlchemy and is released under
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# the MIT License: https://www.opensource.org/licenses/mit-license.php
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r"""
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.. dialect:: mysql+asyncmy
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:name: asyncmy
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:dbapi: asyncmy
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:connectstring: mysql+asyncmy://user:password@host:port/dbname[?key=value&key=value...]
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:url: https://github.com/long2ice/asyncmy
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.. note:: The asyncmy dialect as of September, 2021 was added to provide
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MySQL/MariaDB asyncio compatibility given that the :ref:`aiomysql` database
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driver has become unmaintained, however asyncmy is itself very new.
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Using a special asyncio mediation layer, the asyncmy dialect is usable
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as the backend for the :ref:`SQLAlchemy asyncio <asyncio_toplevel>`
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extension package.
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This dialect should normally be used only with the
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:func:`_asyncio.create_async_engine` engine creation function::
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from sqlalchemy.ext.asyncio import create_async_engine
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engine = create_async_engine("mysql+asyncmy://user:pass@hostname/dbname?charset=utf8mb4")
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""" # noqa
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from .pymysql import MySQLDialect_pymysql
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from ... import pool
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from ... import util
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from ...engine import AdaptedConnection
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from ...util.concurrency import asynccontextmanager
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from ...util.concurrency import asyncio
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from ...util.concurrency import await_fallback
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from ...util.concurrency import await_only
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class AsyncAdapt_asyncmy_cursor:
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server_side = False
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__slots__ = (
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"_adapt_connection",
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"_connection",
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"await_",
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"_cursor",
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"_rows",
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)
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def __init__(self, adapt_connection):
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self._adapt_connection = adapt_connection
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self._connection = adapt_connection._connection
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self.await_ = adapt_connection.await_
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cursor = self._connection.cursor()
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self._cursor = self.await_(cursor.__aenter__())
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self._rows = []
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@property
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def description(self):
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return self._cursor.description
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@property
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def rowcount(self):
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return self._cursor.rowcount
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@property
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def arraysize(self):
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return self._cursor.arraysize
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@arraysize.setter
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def arraysize(self, value):
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self._cursor.arraysize = value
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@property
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def lastrowid(self):
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return self._cursor.lastrowid
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def close(self):
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# note we aren't actually closing the cursor here,
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# we are just letting GC do it. to allow this to be async
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# we would need the Result to change how it does "Safe close cursor".
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# MySQL "cursors" don't actually have state to be "closed" besides
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# exhausting rows, which we already have done for sync cursor.
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# another option would be to emulate aiosqlite dialect and assign
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# cursor only if we are doing server side cursor operation.
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self._rows[:] = []
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def execute(self, operation, parameters=None):
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return self.await_(self._execute_async(operation, parameters))
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def executemany(self, operation, seq_of_parameters):
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return self.await_(
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self._executemany_async(operation, seq_of_parameters)
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)
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async def _execute_async(self, operation, parameters):
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async with self._adapt_connection._mutex_and_adapt_errors():
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if parameters is None:
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result = await self._cursor.execute(operation)
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else:
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result = await self._cursor.execute(operation, parameters)
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if not self.server_side:
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# asyncmy has a "fake" async result, so we have to pull it out
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# of that here since our default result is not async.
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# we could just as easily grab "_rows" here and be done with it
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# but this is safer.
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self._rows = list(await self._cursor.fetchall())
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return result
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async def _executemany_async(self, operation, seq_of_parameters):
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async with self._adapt_connection._mutex_and_adapt_errors():
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return await self._cursor.executemany(operation, seq_of_parameters)
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def setinputsizes(self, *inputsizes):
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pass
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def __iter__(self):
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while self._rows:
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yield self._rows.pop(0)
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def fetchone(self):
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if self._rows:
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return self._rows.pop(0)
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else:
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return None
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def fetchmany(self, size=None):
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if size is None:
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size = self.arraysize
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retval = self._rows[0:size]
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self._rows[:] = self._rows[size:]
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return retval
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def fetchall(self):
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retval = self._rows[:]
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self._rows[:] = []
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return retval
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class AsyncAdapt_asyncmy_ss_cursor(AsyncAdapt_asyncmy_cursor):
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__slots__ = ()
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server_side = True
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def __init__(self, adapt_connection):
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self._adapt_connection = adapt_connection
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self._connection = adapt_connection._connection
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self.await_ = adapt_connection.await_
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cursor = self._connection.cursor(
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adapt_connection.dbapi.asyncmy.cursors.SSCursor
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)
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self._cursor = self.await_(cursor.__aenter__())
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def close(self):
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if self._cursor is not None:
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self.await_(self._cursor.close())
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self._cursor = None
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def fetchone(self):
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return self.await_(self._cursor.fetchone())
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def fetchmany(self, size=None):
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return self.await_(self._cursor.fetchmany(size=size))
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def fetchall(self):
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return self.await_(self._cursor.fetchall())
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class AsyncAdapt_asyncmy_connection(AdaptedConnection):
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await_ = staticmethod(await_only)
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__slots__ = ("dbapi", "_connection", "_execute_mutex")
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def __init__(self, dbapi, connection):
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self.dbapi = dbapi
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self._connection = connection
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self._execute_mutex = asyncio.Lock()
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@asynccontextmanager
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async def _mutex_and_adapt_errors(self):
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async with self._execute_mutex:
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try:
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yield
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except AttributeError:
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raise self.dbapi.InternalError(
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"network operation failed due to asyncmy attribute error"
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)
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def ping(self, reconnect):
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assert not reconnect
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return self.await_(self._do_ping())
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async def _do_ping(self):
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async with self._mutex_and_adapt_errors():
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return await self._connection.ping(False)
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def character_set_name(self):
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return self._connection.character_set_name()
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def autocommit(self, value):
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self.await_(self._connection.autocommit(value))
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def cursor(self, server_side=False):
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if server_side:
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return AsyncAdapt_asyncmy_ss_cursor(self)
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else:
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return AsyncAdapt_asyncmy_cursor(self)
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def rollback(self):
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self.await_(self._connection.rollback())
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def commit(self):
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self.await_(self._connection.commit())
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def close(self):
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# it's not awaitable.
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self._connection.close()
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class AsyncAdaptFallback_asyncmy_connection(AsyncAdapt_asyncmy_connection):
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__slots__ = ()
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await_ = staticmethod(await_fallback)
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def _Binary(x):
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"""Return x as a binary type."""
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return bytes(x)
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class AsyncAdapt_asyncmy_dbapi:
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def __init__(self, asyncmy):
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self.asyncmy = asyncmy
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self.paramstyle = "format"
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self._init_dbapi_attributes()
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def _init_dbapi_attributes(self):
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for name in (
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"Warning",
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"Error",
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"InterfaceError",
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"DataError",
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"DatabaseError",
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"OperationalError",
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"InterfaceError",
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"IntegrityError",
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"ProgrammingError",
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"InternalError",
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"NotSupportedError",
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):
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setattr(self, name, getattr(self.asyncmy.errors, name))
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STRING = util.symbol("STRING")
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NUMBER = util.symbol("NUMBER")
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BINARY = util.symbol("BINARY")
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DATETIME = util.symbol("DATETIME")
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TIMESTAMP = util.symbol("TIMESTAMP")
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Binary = staticmethod(_Binary)
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def connect(self, *arg, **kw):
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async_fallback = kw.pop("async_fallback", False)
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if util.asbool(async_fallback):
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return AsyncAdaptFallback_asyncmy_connection(
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self,
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await_fallback(self.asyncmy.connect(*arg, **kw)),
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)
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else:
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return AsyncAdapt_asyncmy_connection(
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self,
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await_only(self.asyncmy.connect(*arg, **kw)),
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)
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class MySQLDialect_asyncmy(MySQLDialect_pymysql):
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driver = "asyncmy"
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supports_statement_cache = True
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supports_server_side_cursors = True
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_sscursor = AsyncAdapt_asyncmy_ss_cursor
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is_async = True
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@classmethod
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def dbapi(cls):
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return AsyncAdapt_asyncmy_dbapi(__import__("asyncmy"))
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@classmethod
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def get_pool_class(cls, url):
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async_fallback = url.query.get("async_fallback", False)
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if util.asbool(async_fallback):
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return pool.FallbackAsyncAdaptedQueuePool
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else:
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return pool.AsyncAdaptedQueuePool
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def create_connect_args(self, url):
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return super(MySQLDialect_asyncmy, self).create_connect_args(
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url, _translate_args=dict(username="user", database="db")
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)
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def is_disconnect(self, e, connection, cursor):
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if super(MySQLDialect_asyncmy, self).is_disconnect(
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e, connection, cursor
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):
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return True
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else:
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str_e = str(e).lower()
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return (
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"not connected" in str_e or "network operation failed" in str_e
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)
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def _found_rows_client_flag(self):
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from asyncmy.constants import CLIENT
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return CLIENT.FOUND_ROWS
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def get_driver_connection(self, connection):
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return connection._connection
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dialect = MySQLDialect_asyncmy
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