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