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Þ'¯°ÌME[YéïĵÂCå½ Ué©Áû'Ê9%eÔðNU”ë‘ÌsD3/®+UI˜9h.WC”빓$#:pz:YÓ ¿xž* ³$Í +$kñAŠ‹†¢ Uê>¸)_š¬÷©ßAÂÔb9ÇU ¯¾á•9¯ÏÏ÷O÷¼¼Fähal1‰3Ì[Ïr•´UCksNÐ] R‘¸¥H+§Šé†c©vÖÞ0iÓ76s†î!§=ß ¼~Ô'°Ãmäoäš³ªøi1úÉ)³yV8 CLÄØÁ‘WYïi€H6ÖÑiámø^ÈY´°Ñ7¥Û*—Ñ©L«Qƒï—Ùrÿ ›£Ð*š¸ˆL©ˆ$ˆ ÷¾D§9È®«qbqC)–ˆïv´çñsÑVT­Ø, <àïºÀO«Jý·õ àfPìð .wFšir´þ’2_Y *Æ€x\« ì€9š@ Ž|F⇥ˆkZ@hÖÄ0t¿-<“‹qµ¾*ZL¤Ú)&BJpÓF5=$„at*Zš$’ÑtdûÝRI1 2Ž‰$€$I$#‰SÞ’Hë¬ï;Á$¡t$’`<(ñÇt)$‡Ð.Êf¢X’Kt=Éé$‚ˆªè¢oÝëòI%Rgcª÷ŠyI%¡‰ÿ !ñ)´õ $¤ Ô’IIGÿÙ# Copyright (c) 2023, 2026, Oracle and/or its affiliates. # # This program is free software; you can redistribute it and/or modify # it under the terms of the GNU General Public License, version 2.0, as # published by the Free Software Foundation. # # This program is designed to work with certain software (including # but not limited to OpenSSL) that is licensed under separate terms, # as designated in a particular file or component or in included license # documentation. The authors of MySQL hereby grant you an # additional permission to link the program and your derivative works # with the separately licensed software that they have either included with # the program or referenced in the documentation. # # Without limiting anything contained in the foregoing, this file, # which is part of MySQL Connector/Python, is also subject to the # Universal FOSS Exception, version 1.0, a copy of which can be found at # http://oss.oracle.com/licenses/universal-foss-exception. # # This program is distributed in the hope that it will be useful, but # WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. # See the GNU General Public License, version 2.0, for more details. # # You should have received a copy of the GNU General Public License # along with this program; if not, write to the Free Software Foundation, Inc., # 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA # mypy: disable-error-code="attr-defined" # pylint: disable=protected-access """Utilities.""" __all__ = ["to_thread", "open_connection"] import asyncio import contextvars import functools try: import ssl except ImportError: ssl = None from typing import TYPE_CHECKING, Any, Callable, Tuple if TYPE_CHECKING: from mysql.connector.aio.abstracts import MySQLConnectionAbstract __all__.append("StreamWriter") class StreamReaderProtocol(asyncio.StreamReaderProtocol): """Extends asyncio.streams.StreamReaderProtocol for adding start_tls(). The ``start_tls()`` is based on ``asyncio.streams.StreamWriter`` introduced in Python 3.11. It provides the same functionality for older Python versions. """ def _replace_writer(self, writer: asyncio.StreamWriter) -> None: """Replace stream writer. Args: writer: Stream Writer. """ transport = writer.transport self._stream_writer = writer self._transport = transport self._over_ssl = transport.get_extra_info("sslcontext") is not None class StreamWriter(asyncio.streams.StreamWriter): """Extends asyncio.streams.StreamWriter for adding start_tls(). The ``start_tls()`` is based on ``asyncio.streams.StreamWriter`` introduced in Python 3.11. It provides the same functionality for older Python versions. """ async def start_tls( self, ssl_context: ssl.SSLContext, *, server_hostname: str = None, ssl_handshake_timeout: int = None, ) -> None: """Upgrade an existing stream-based connection to TLS. Args: ssl_context: Configured SSL context. server_hostname: Server host name. ssl_handshake_timeout: SSL handshake timeout. """ server_side = self._protocol._client_connected_cb is not None protocol = self._protocol await self.drain() new_transport = await self._loop.start_tls( # pylint: disable=access-member-before-definition self._transport, # type: ignore[has-type] protocol, ssl_context, server_side=server_side, server_hostname=server_hostname, ssl_handshake_timeout=ssl_handshake_timeout, ) self._transport = ( # pylint: disable=attribute-defined-outside-init new_transport ) protocol._replace_writer(self) async def open_connection( host: str = None, port: int = None, *, limit: int = 2**16, **kwds: Any ) -> Tuple[asyncio.StreamReader, StreamWriter]: """A wrapper for create_connection() returning a (reader, writer) pair. This function is based on ``asyncio.streams.open_connection`` and adds a custom stream reader. MySQL expects TLS negotiation to happen in the middle of a TCP connection, not at the start. This function in conjunction with ``_StreamReaderProtocol`` and ``_StreamWriter`` allows the TLS negotiation on an existing connection. Args: host: Server host name. port: Server port. limit: The buffer size limit used by the returned ``StreamReader`` instance. By default the limit is set to 64 KiB. Returns: tuple: Returns a pair of reader and writer objects that are instances of ``StreamReader`` and ``StreamWriter`` classes. """ loop = asyncio.get_running_loop() reader = asyncio.streams.StreamReader(limit=limit, loop=loop) protocol = StreamReaderProtocol(reader, loop=loop) transport, _ = await loop.create_connection(lambda: protocol, host, port, **kwds) writer = StreamWriter(transport, protocol, reader, loop) return reader, writer async def to_thread(func: Callable, *args: Any, **kwargs: Any) -> asyncio.Future: """Asynchronously run function ``func`` in a separate thread. This function is based on ``asyncio.to_thread()`` introduced in Python 3.9, which provides the same functionality for older Python versions. Returns: coroutine: A coroutine that can be awaited to get the eventual result of ``func``. """ loop = asyncio.get_running_loop() ctx = contextvars.copy_context() func_call = functools.partial(ctx.run, func, *args, **kwargs) return await loop.run_in_executor(None, func_call)