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Get rid of full_sync
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Lonami Exo
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@ -14,31 +14,48 @@ is there to tell you when these important changes happen.
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Compatibility
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*************
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.. important::
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Some decisions when developing will inevitable be proven wrong in the future.
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One of these decisions was using threads. Now that Python 3.4 is reaching EOL
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and using ``asyncio`` is usable as of Python 3.5 it makes sense for a library
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like Telethon to make a good use of it.
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**You should not enable the thread-compatibility mode for new projects.**
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It comes with a cost, and new projects will greatly benefit from using
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``asyncio`` by default such as increased speed and easier reasoning about
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the code flow. You should only enable it for old projects you don't have
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the time to upgrade to ``asyncio``.
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If you have old code, **just use old versions** of the library! There is
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nothing wrong with that other than not getting new updates or fixes, but
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using a fixed version with ``pip install telethon==0.19.1.6`` is easy
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enough to do.
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There exists a fair amount of code online using Telethon before it reached
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its 1.0 version, where it became fully asynchronous by default. Since it was
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necessary to clean some things, compatibility was not kept 100% but the
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changes are simple:
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You might want to consider using `Virtual Environments
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<https://docs.python.org/3/tutorial/venv.html>`_ in your projects.
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There's no point in maintaining a synchronous version because the whole point
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is that people don't have time to upgrade, and there has been several changes
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and clean-ups. Using an older version is the right way to go.
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Sometimes, other small decisions are made. These all will be reflected in the
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:ref:`changelog` which you should read when upgrading.
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If you want to jump the ``asyncio`` boat, here are some of the things you will
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need to start migrating really old code:
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.. code-block:: python
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# 1. The library no longer uses threads.
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# Add this at the **beginning** of your script to work around that.
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from telethon import full_sync
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full_sync.enable()
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# 1. Import the client from telethon.sync
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from telethon.sync import TelegramClient
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# 2. client.connect() no longer returns True.
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# Change this...
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# 2. Change this monster...
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try:
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assert client.connect()
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if not client.is_user_authorized():
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client.send_code_request(phone_number)
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me = client.sign_in(phone_number, input('Enter code: '))
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... # REST OF YOUR CODE
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finally:
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client.disconnect()
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# ...for this:
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client.connect()
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with client:
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... # REST OF YOUR CODE
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# 3. client.idle() no longer exists.
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# Change this...
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@ -52,11 +69,10 @@ changes are simple:
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# ...to this:
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client.add_event_handler(handler)
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# 5. It's good practice to stop the full_sync mode once you're done
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try:
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... # all your code in here
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finally:
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full_sync.stop()
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In addition, all the update handlers must be ``async def``, and you need
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to ``await`` method calls that rely on network requests, such as getting
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the chat or sender. If you don't use updates, you're done!
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Convenience
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@ -75,8 +91,8 @@ Convenience
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This makes the examples shorter and easier to think about.
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For quick scripts that don't need updates, it's a lot more convenient to
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forget about ``full_sync`` or ``asyncio`` and just work with sequential code.
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This can prove to be a powerful hybrid for running under the Python REPL too.
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forget about ``asyncio`` and just work with sequential code. This can prove
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to be a powerful hybrid for running under the Python REPL too.
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.. code-block:: python
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@ -122,7 +138,7 @@ Speed
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When you're ready to micro-optimize your application, or if you simply
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don't need to call any non-basic methods from a synchronous context,
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just get rid of both ``telethon.sync`` and ``telethon.full_sync``:
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just get rid of ``telethon.sync`` and work inside an ``async def``:
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.. code-block:: python
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@ -2,7 +2,7 @@ import logging
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from .client.telegramclient import TelegramClient
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from .network import connection
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from .tl import types, functions, custom
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from . import version, events, utils, errors, full_sync
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from . import version, events, utils, errors
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__version__ = version.__version__
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@ -1,184 +0,0 @@
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"""
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This magical module will rewrite all public methods in the public interface of
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the library so they can delegate the call to an asyncio event loop in another
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thread and wait for the result. This rewrite may not be desirable if the end
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user always uses the methods they way they should be ran, but it's incredibly
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useful for quick scripts and legacy code.
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"""
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import asyncio
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import functools
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import inspect
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import threading
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from concurrent.futures import Future, ThreadPoolExecutor
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from async_generator import isasyncgenfunction
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from . import events
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from .client.telegramclient import TelegramClient
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from .tl.custom import (
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Draft, Dialog, MessageButton, Forward, Message, InlineResult, Conversation
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)
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from .tl.custom.chatgetter import ChatGetter
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from .tl.custom.sendergetter import SenderGetter
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async def _proxy_future(af, cf):
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try:
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res = await af
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cf.set_result(res)
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except Exception as e:
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cf.set_exception(e)
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def _sync_result(loop, x):
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f = Future()
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loop.call_soon_threadsafe(asyncio.ensure_future, _proxy_future(x, f))
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return f.result()
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class _SyncGen:
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def __init__(self, loop, gen):
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self.loop = loop
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self.gen = gen
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def __iter__(self):
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return self
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def __next__(self):
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try:
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return _sync_result(self.loop, self.gen.__anext__())
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except StopAsyncIteration:
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raise StopIteration from None
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def _syncify_wrap(t, method_name, loop, thread_ident,
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syncifier=_sync_result, rename=None):
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method = getattr(t, method_name)
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@functools.wraps(method)
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def syncified(*args, **kwargs):
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coro = method(*args, **kwargs)
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return (
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coro if threading.get_ident() == thread_ident
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else syncifier(loop, coro)
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)
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setattr(t, rename or method_name, syncified)
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def _syncify(*types, loop, thread_ident):
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for t in types:
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# __enter__ and __exit__ need special care (VERY dirty hack).
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#
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# Normally we want them to raise if the loop is running because
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# the user can't await there, and they need the async with variant.
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#
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# However they check if the loop is running to raise, which it is
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# with full_sync enabled, so we patch them with the async variant.
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if hasattr(t, '__aenter__'):
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_syncify_wrap(
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t, '__aenter__', loop, thread_ident, rename='__enter__')
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_syncify_wrap(
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t, '__aexit__', loop, thread_ident, rename='__exit__')
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for name in dir(t):
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if not name.startswith('_') or name == '__call__':
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meth = getattr(t, name)
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meth = getattr(meth, '__tl.sync', meth)
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if inspect.iscoroutinefunction(meth):
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_syncify_wrap(t, name, loop, thread_ident)
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elif isasyncgenfunction(meth):
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_syncify_wrap(t, name, loop, thread_ident, _SyncGen)
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__asyncthread = None
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def enable(*, loop=None, executor=None, max_workers=1):
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"""
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Enables the fully synchronous mode. You should enable this at
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the beginning of your script, right after importing, only once.
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**Please** make sure to call `stop` at the end of your script.
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You can define the event loop to use and executor, otherwise
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the default loop and ``ThreadPoolExecutor`` will be used, in
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which case `max_workers` will be passed to it. If you pass a
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custom executor, `max_workers` will be ignored.
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"""
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global __asyncthread
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if __asyncthread is not None:
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raise RuntimeError("full_sync can only be enabled once")
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if not loop:
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loop = asyncio.get_event_loop()
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if not executor:
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executor = ThreadPoolExecutor(max_workers=max_workers)
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def start():
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asyncio.set_event_loop(loop)
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loop.run_forever()
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__asyncthread = threading.Thread(
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target=start, name="__telethon_async_thread__", daemon=True
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)
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__asyncthread.start()
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__asyncthread.loop = loop
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__asyncthread.executor = executor
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TelegramClient.__init__ = functools.partialmethod(
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TelegramClient.__init__, loop=loop
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)
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event_cls = filter(None, (
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getattr(getattr(events, name), 'Event', None)
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for name in dir(events)
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))
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_syncify(TelegramClient, Draft, Dialog, MessageButton, ChatGetter,
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SenderGetter, Forward, Message, InlineResult, Conversation,
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*event_cls,
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loop=loop, thread_ident=__asyncthread.ident)
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_syncify_wrap(TelegramClient, "start", loop, __asyncthread.ident)
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old_add_event_handler = TelegramClient.add_event_handler
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old_remove_event_handler = TelegramClient.remove_event_handler
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proxied_event_handlers = {}
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@functools.wraps(old_add_event_handler)
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def add_proxied_event_handler(self, callback, *args, **kwargs):
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async def _proxy(*pargs, **pkwargs):
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await loop.run_in_executor(
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executor, functools.partial(callback, *pargs, **pkwargs))
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proxied_event_handlers[callback] = _proxy
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args = (self, _proxy, *args)
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return old_add_event_handler(*args, **kwargs)
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@functools.wraps(old_remove_event_handler)
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def remove_proxied_event_handler(self, callback, *args, **kwargs):
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args = (self, proxied_event_handlers.get(callback, callback), *args)
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return old_remove_event_handler(*args, **kwargs)
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TelegramClient.add_event_handler = add_proxied_event_handler
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TelegramClient.remove_event_handler = remove_proxied_event_handler
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def run_until_disconnected(self):
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return _sync_result(loop, self._run_until_disconnected())
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TelegramClient.run_until_disconnected = run_until_disconnected
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return __asyncthread
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def stop():
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"""
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Stops the fully synchronous code. You
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should call this before your script exits.
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"""
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global __asyncthread
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if not __asyncthread:
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raise RuntimeError("Can't find asyncio thread")
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__asyncthread.loop.call_soon_threadsafe(__asyncthread.loop.stop)
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__asyncthread.executor.shutdown()
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