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authorS. Solomon Darnell2025-03-28 21:52:21 -0500
committerS. Solomon Darnell2025-03-28 21:52:21 -0500
commit4a52a71956a8d46fcb7294ac71734504bb09bcc2 (patch)
treeee3dc5af3b6313e921cd920906356f5d4febc4ed /.venv/lib/python3.12/site-packages/sqlalchemy/dialects/sqlite/aiosqlite.py
parentcc961e04ba734dd72309fb548a2f97d67d578813 (diff)
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two version of R2R are here HEAD master
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+# dialects/sqlite/aiosqlite.py
+# Copyright (C) 2005-2025 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
+# mypy: ignore-errors
+
+
+r"""
+
+.. dialect:: sqlite+aiosqlite
+    :name: aiosqlite
+    :dbapi: aiosqlite
+    :connectstring: sqlite+aiosqlite:///file_path
+    :url: https://pypi.org/project/aiosqlite/
+
+The aiosqlite dialect provides support for the SQLAlchemy asyncio interface
+running on top of pysqlite.
+
+aiosqlite is a wrapper around pysqlite that uses a background thread for
+each connection.   It does not actually use non-blocking IO, as SQLite
+databases are not socket-based.  However it does provide a working asyncio
+interface that's useful for testing and prototyping purposes.
+
+Using a special asyncio mediation layer, the aiosqlite 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("sqlite+aiosqlite:///filename")
+
+The URL passes through all arguments to the ``pysqlite`` driver, so all
+connection arguments are the same as they are for that of :ref:`pysqlite`.
+
+.. _aiosqlite_udfs:
+
+User-Defined Functions
+----------------------
+
+aiosqlite extends pysqlite to support async, so we can create our own user-defined functions (UDFs)
+in Python and use them directly in SQLite queries as described here: :ref:`pysqlite_udfs`.
+
+.. _aiosqlite_serializable:
+
+Serializable isolation / Savepoints / Transactional DDL (asyncio version)
+-------------------------------------------------------------------------
+
+Similarly to pysqlite, aiosqlite does not support SAVEPOINT feature.
+
+The solution is similar to :ref:`pysqlite_serializable`. This is achieved by the event listeners in async::
+
+    from sqlalchemy import create_engine, event
+    from sqlalchemy.ext.asyncio import create_async_engine
+
+    engine = create_async_engine("sqlite+aiosqlite:///myfile.db")
+
+
+    @event.listens_for(engine.sync_engine, "connect")
+    def do_connect(dbapi_connection, connection_record):
+        # disable aiosqlite's emitting of the BEGIN statement entirely.
+        # also stops it from emitting COMMIT before any DDL.
+        dbapi_connection.isolation_level = None
+
+
+    @event.listens_for(engine.sync_engine, "begin")
+    def do_begin(conn):
+        # emit our own BEGIN
+        conn.exec_driver_sql("BEGIN")
+
+.. warning:: When using the above recipe, it is advised to not use the
+   :paramref:`.Connection.execution_options.isolation_level` setting on
+   :class:`_engine.Connection` and :func:`_sa.create_engine`
+   with the SQLite driver,
+   as this function necessarily will also alter the ".isolation_level" setting.
+
+.. _aiosqlite_pooling:
+
+Pooling Behavior
+----------------
+
+The SQLAlchemy ``aiosqlite`` DBAPI establishes the connection pool differently
+based on the kind of SQLite database that's requested:
+
+* When a ``:memory:`` SQLite database is specified, the dialect by default
+  will use :class:`.StaticPool`. This pool maintains a single
+  connection, so that all access to the engine
+  use the same ``:memory:`` database.
+* When a file-based database is specified, the dialect will use
+  :class:`.AsyncAdaptedQueuePool` as the source of connections.
+
+  .. versionchanged:: 2.0.38
+
+    SQLite file database engines now use :class:`.AsyncAdaptedQueuePool` by default.
+    Previously, :class:`.NullPool` were used.  The :class:`.NullPool` class
+    may be used by specifying it via the
+    :paramref:`_sa.create_engine.poolclass` parameter.
+
+"""  # noqa
+
+import asyncio
+from collections import deque
+from functools import partial
+
+from .base import SQLiteExecutionContext
+from .pysqlite import SQLiteDialect_pysqlite
+from ... import pool
+from ... import util
+from ...engine import AdaptedConnection
+from ...util.concurrency import await_fallback
+from ...util.concurrency import await_only
+
+
+class AsyncAdapt_aiosqlite_cursor:
+    # TODO: base on connectors/asyncio.py
+    # see #10415
+
+    __slots__ = (
+        "_adapt_connection",
+        "_connection",
+        "description",
+        "await_",
+        "_rows",
+        "arraysize",
+        "rowcount",
+        "lastrowid",
+    )
+
+    server_side = False
+
+    def __init__(self, adapt_connection):
+        self._adapt_connection = adapt_connection
+        self._connection = adapt_connection._connection
+        self.await_ = adapt_connection.await_
+        self.arraysize = 1
+        self.rowcount = -1
+        self.description = None
+        self._rows = deque()
+
+    def close(self):
+        self._rows.clear()
+
+    def execute(self, operation, parameters=None):
+        try:
+            _cursor = self.await_(self._connection.cursor())
+
+            if parameters is None:
+                self.await_(_cursor.execute(operation))
+            else:
+                self.await_(_cursor.execute(operation, parameters))
+
+            if _cursor.description:
+                self.description = _cursor.description
+                self.lastrowid = self.rowcount = -1
+
+                if not self.server_side:
+                    self._rows = deque(self.await_(_cursor.fetchall()))
+            else:
+                self.description = None
+                self.lastrowid = _cursor.lastrowid
+                self.rowcount = _cursor.rowcount
+
+            if not self.server_side:
+                self.await_(_cursor.close())
+            else:
+                self._cursor = _cursor
+        except Exception as error:
+            self._adapt_connection._handle_exception(error)
+
+    def executemany(self, operation, seq_of_parameters):
+        try:
+            _cursor = self.await_(self._connection.cursor())
+            self.await_(_cursor.executemany(operation, seq_of_parameters))
+            self.description = None
+            self.lastrowid = _cursor.lastrowid
+            self.rowcount = _cursor.rowcount
+            self.await_(_cursor.close())
+        except Exception as error:
+            self._adapt_connection._handle_exception(error)
+
+    def setinputsizes(self, *inputsizes):
+        pass
+
+    def __iter__(self):
+        while self._rows:
+            yield self._rows.popleft()
+
+    def fetchone(self):
+        if self._rows:
+            return self._rows.popleft()
+        else:
+            return None
+
+    def fetchmany(self, size=None):
+        if size is None:
+            size = self.arraysize
+
+        rr = self._rows
+        return [rr.popleft() for _ in range(min(size, len(rr)))]
+
+    def fetchall(self):
+        retval = list(self._rows)
+        self._rows.clear()
+        return retval
+
+
+class AsyncAdapt_aiosqlite_ss_cursor(AsyncAdapt_aiosqlite_cursor):
+    # TODO: base on connectors/asyncio.py
+    # see #10415
+    __slots__ = "_cursor"
+
+    server_side = True
+
+    def __init__(self, *arg, **kw):
+        super().__init__(*arg, **kw)
+        self._cursor = None
+
+    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):
+        if size is None:
+            size = self.arraysize
+        return self.await_(self._cursor.fetchmany(size=size))
+
+    def fetchall(self):
+        return self.await_(self._cursor.fetchall())
+
+
+class AsyncAdapt_aiosqlite_connection(AdaptedConnection):
+    await_ = staticmethod(await_only)
+    __slots__ = ("dbapi",)
+
+    def __init__(self, dbapi, connection):
+        self.dbapi = dbapi
+        self._connection = connection
+
+    @property
+    def isolation_level(self):
+        return self._connection.isolation_level
+
+    @isolation_level.setter
+    def isolation_level(self, value):
+        # aiosqlite's isolation_level setter works outside the Thread
+        # that it's supposed to, necessitating setting check_same_thread=False.
+        # for improved stability, we instead invent our own awaitable version
+        # using aiosqlite's async queue directly.
+
+        def set_iso(connection, value):
+            connection.isolation_level = value
+
+        function = partial(set_iso, self._connection._conn, value)
+        future = asyncio.get_event_loop().create_future()
+
+        self._connection._tx.put_nowait((future, function))
+
+        try:
+            return self.await_(future)
+        except Exception as error:
+            self._handle_exception(error)
+
+    def create_function(self, *args, **kw):
+        try:
+            self.await_(self._connection.create_function(*args, **kw))
+        except Exception as error:
+            self._handle_exception(error)
+
+    def cursor(self, server_side=False):
+        if server_side:
+            return AsyncAdapt_aiosqlite_ss_cursor(self)
+        else:
+            return AsyncAdapt_aiosqlite_cursor(self)
+
+    def execute(self, *args, **kw):
+        return self.await_(self._connection.execute(*args, **kw))
+
+    def rollback(self):
+        try:
+            self.await_(self._connection.rollback())
+        except Exception as error:
+            self._handle_exception(error)
+
+    def commit(self):
+        try:
+            self.await_(self._connection.commit())
+        except Exception as error:
+            self._handle_exception(error)
+
+    def close(self):
+        try:
+            self.await_(self._connection.close())
+        except ValueError:
+            # this is undocumented for aiosqlite, that ValueError
+            # was raised if .close() was called more than once, which is
+            # both not customary for DBAPI and is also not a DBAPI.Error
+            # exception. This is now fixed in aiosqlite via my PR
+            # https://github.com/omnilib/aiosqlite/pull/238, so we can be
+            # assured this will not become some other kind of exception,
+            # since it doesn't raise anymore.
+
+            pass
+        except Exception as error:
+            self._handle_exception(error)
+
+    def _handle_exception(self, error):
+        if (
+            isinstance(error, ValueError)
+            and error.args[0] == "no active connection"
+        ):
+            raise self.dbapi.sqlite.OperationalError(
+                "no active connection"
+            ) from error
+        else:
+            raise error
+
+
+class AsyncAdaptFallback_aiosqlite_connection(AsyncAdapt_aiosqlite_connection):
+    __slots__ = ()
+
+    await_ = staticmethod(await_fallback)
+
+
+class AsyncAdapt_aiosqlite_dbapi:
+    def __init__(self, aiosqlite, sqlite):
+        self.aiosqlite = aiosqlite
+        self.sqlite = sqlite
+        self.paramstyle = "qmark"
+        self._init_dbapi_attributes()
+
+    def _init_dbapi_attributes(self):
+        for name in (
+            "DatabaseError",
+            "Error",
+            "IntegrityError",
+            "NotSupportedError",
+            "OperationalError",
+            "ProgrammingError",
+            "sqlite_version",
+            "sqlite_version_info",
+        ):
+            setattr(self, name, getattr(self.aiosqlite, name))
+
+        for name in ("PARSE_COLNAMES", "PARSE_DECLTYPES"):
+            setattr(self, name, getattr(self.sqlite, name))
+
+        for name in ("Binary",):
+            setattr(self, name, getattr(self.sqlite, name))
+
+    def connect(self, *arg, **kw):
+        async_fallback = kw.pop("async_fallback", False)
+
+        creator_fn = kw.pop("async_creator_fn", None)
+        if creator_fn:
+            connection = creator_fn(*arg, **kw)
+        else:
+            connection = self.aiosqlite.connect(*arg, **kw)
+            # it's a Thread.   you'll thank us later
+            connection.daemon = True
+
+        if util.asbool(async_fallback):
+            return AsyncAdaptFallback_aiosqlite_connection(
+                self,
+                await_fallback(connection),
+            )
+        else:
+            return AsyncAdapt_aiosqlite_connection(
+                self,
+                await_only(connection),
+            )
+
+
+class SQLiteExecutionContext_aiosqlite(SQLiteExecutionContext):
+    def create_server_side_cursor(self):
+        return self._dbapi_connection.cursor(server_side=True)
+
+
+class SQLiteDialect_aiosqlite(SQLiteDialect_pysqlite):
+    driver = "aiosqlite"
+    supports_statement_cache = True
+
+    is_async = True
+
+    supports_server_side_cursors = True
+
+    execution_ctx_cls = SQLiteExecutionContext_aiosqlite
+
+    @classmethod
+    def import_dbapi(cls):
+        return AsyncAdapt_aiosqlite_dbapi(
+            __import__("aiosqlite"), __import__("sqlite3")
+        )
+
+    @classmethod
+    def get_pool_class(cls, url):
+        if cls._is_url_file_db(url):
+            return pool.AsyncAdaptedQueuePool
+        else:
+            return pool.StaticPool
+
+    def is_disconnect(self, e, connection, cursor):
+        if isinstance(
+            e, self.dbapi.OperationalError
+        ) and "no active connection" in str(e):
+            return True
+
+        return super().is_disconnect(e, connection, cursor)
+
+    def get_driver_connection(self, connection):
+        return connection._connection
+
+
+dialect = SQLiteDialect_aiosqlite