mirror of
https://github.com/python-telegram-bot/python-telegram-bot.git
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288 lines
8.8 KiB
Python
288 lines
8.8 KiB
Python
#!/usr/bin/env python
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#
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# A library that provides a Python interface to the Telegram Bot API
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# Copyright (C) 2015-2016
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# Leandro Toledo de Souza <devs@python-telegram-bot.org>
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Lesser Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Lesser Public License for more details.
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#
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# You should have received a copy of the GNU Lesser Public License
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# along with this program. If not, see [http://www.gnu.org/licenses/].
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"""This module contains the Dispatcher class."""
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import logging
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from functools import wraps
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from threading import Thread, BoundedSemaphore, Lock, Event, current_thread
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from time import sleep
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from queue import Empty
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from telegram import (TelegramError, NullHandler)
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from telegram.ext.handler import Handler
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logging.getLogger(__name__).addHandler(NullHandler())
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semaphore = None
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async_threads = set()
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""":type: set[Thread]"""
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async_lock = Lock()
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DEFAULT_GROUP = 0
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def run_async(func):
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"""
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Function decorator that will run the function in a new thread.
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Args:
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func (function): The function to run in the thread.
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Returns:
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function:
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"""
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# TODO: handle exception in async threads
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# set a threading.Event to notify caller thread
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@wraps(func)
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def pooled(*pargs, **kwargs):
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"""
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A wrapper to run a thread in a thread pool
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"""
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try:
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result = func(*pargs, **kwargs)
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finally:
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semaphore.release()
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with async_lock:
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async_threads.remove(current_thread())
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return result
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@wraps(func)
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def async_func(*pargs, **kwargs):
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"""
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A wrapper to run a function in a thread
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"""
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thread = Thread(target=pooled, args=pargs, kwargs=kwargs)
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semaphore.acquire()
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with async_lock:
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async_threads.add(thread)
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thread.start()
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return thread
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return async_func
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class Dispatcher(object):
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"""
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This class dispatches all kinds of updates to its registered handlers.
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Args:
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bot (telegram.Bot): The bot object that should be passed to the
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handlers
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update_queue (Queue): The synchronized queue that will contain the
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updates.
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"""
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def __init__(self, bot, update_queue, workers=4, exception_event=None):
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self.bot = bot
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self.update_queue = update_queue
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self.handlers = {}
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""":type: dict[int, list[Handler]"""
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self.groups = []
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""":type: list[int]"""
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self.error_handlers = []
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self.logger = logging.getLogger(__name__)
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self.running = False
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self.__stop_event = Event()
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self.__exception_event = exception_event or Event()
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global semaphore
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if not semaphore:
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semaphore = BoundedSemaphore(value=workers)
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else:
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self.logger.debug('Semaphore already initialized, skipping.')
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def start(self):
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"""
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Thread target of thread 'dispatcher'. Runs in background and processes
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the update queue.
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"""
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if self.running:
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self.logger.warning('already running')
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return
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if self.__exception_event.is_set():
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msg = 'reusing dispatcher after exception event is forbidden'
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self.logger.error(msg)
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raise TelegramError(msg)
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self.running = True
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self.logger.debug('Dispatcher started')
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while True:
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try:
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# Pop update from update queue.
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update = self.update_queue.get(True, 1)
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except Empty:
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if self.__stop_event.is_set():
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self.logger.debug('orderly stopping')
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break
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elif self.__exception_event.is_set():
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self.logger.critical(
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'stopping due to exception in another thread')
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break
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continue
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self.logger.debug('Processing Update: %s' % update)
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self.processUpdate(update)
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self.running = False
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self.logger.debug('Dispatcher thread stopped')
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def stop(self):
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"""
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Stops the thread
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"""
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if self.running:
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self.__stop_event.set()
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while self.running:
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sleep(0.1)
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self.__stop_event.clear()
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def processUpdate(self, update):
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"""
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Processes a single update.
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Args:
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update (object):
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"""
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# An error happened while polling
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if isinstance(update, TelegramError):
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self.dispatchError(None, update)
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else:
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for group in self.groups:
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for handler in self.handlers[group]:
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try:
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if handler.checkUpdate(update):
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handler.handleUpdate(update, self)
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break
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# Dispatch any errors
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except TelegramError as te:
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self.logger.warn(
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'A TelegramError was raised while processing the '
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'Update.')
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try:
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self.dispatchError(update, te)
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except Exception:
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self.logger.exception(
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'An uncaught error was raised while '
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'handling the error')
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finally:
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break
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# Errors should not stop the thread
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except Exception:
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self.logger.exception(
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'An uncaught error was raised while '
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'processing the update')
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break
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def addHandler(self, handler, group=DEFAULT_GROUP):
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"""
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Register a handler.
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TL;DR: Order and priority counts. 0 or 1 handlers per group will be
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used.
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A handler must be an instance of a subclass of
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telegram.ext.Handler. All handlers are organized in groups with a
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numeric value. The default group is 0. All groups will be evaluated for
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handling an update, but only 0 or 1 handler per group will be used.
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The priority/order of handlers is determined as follows:
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* Priority of the group (lower group number == higher priority)
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* The first handler in a group which should handle an update will be
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used. Other handlers from the group will not be used. The order in
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which handlers were added to the group defines the priority.
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Args:
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handler (Handler): A Handler instance
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group (Optional[int]): The group identifier. Default is 0
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"""
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if not isinstance(handler, Handler):
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raise TypeError(
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'handler is not an instance of {0}'.format(Handler.__name__))
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if not isinstance(group, int):
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raise TypeError('group is not int')
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if group not in self.handlers:
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self.handlers[group] = list()
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self.groups.append(group)
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self.groups = sorted(self.groups)
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self.handlers[group].append(handler)
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def removeHandler(self, handler, group=DEFAULT_GROUP):
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"""
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Remove a handler from the specified group
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Args:
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handler (Handler): A Handler instance
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group (optional[object]): The group identifier. Default is 0
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"""
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if handler in self.handlers[group]:
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self.handlers[group].remove(handler)
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if not self.handlers[group]:
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del self.handlers[group]
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self.groups.remove(group)
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def addErrorHandler(self, callback):
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"""
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Registers an error handler in the Dispatcher.
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Args:
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handler (function): A function that takes ``Bot, Update,
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TelegramError`` as arguments.
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"""
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self.error_handlers.append(callback)
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def removeErrorHandler(self, callback):
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"""
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De-registers an error handler.
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Args:
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handler (function):
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"""
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if callback in self.error_handlers:
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self.error_handlers.remove(callback)
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def dispatchError(self, update, error):
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"""
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Dispatches an error.
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Args:
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update (object): The update that caused the error
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error (telegram.TelegramError): The Telegram error that was raised.
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"""
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for callback in self.error_handlers:
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callback(self.bot, update, error)
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