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pyTelegramBotAPI/telebot/util.py

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# -*- coding: utf-8 -*-
import threading
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import traceback
import re
import sys
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import six
from six import string_types
# Python3 queue support.
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try:
import Queue
except ImportError:
import queue as Queue
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from telebot import logger
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thread_local = threading.local()
class WorkerThread(threading.Thread):
count = 0
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def __init__(self, exception_callback=None, queue=None, name=None):
if not name:
name = "WorkerThread{0}".format(self.__class__.count + 1)
self.__class__.count += 1
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if not queue:
queue = Queue.Queue()
threading.Thread.__init__(self, name=name)
self.queue = queue
self.daemon = True
self.received_task_event = threading.Event()
self.done_event = threading.Event()
self.exception_event = threading.Event()
self.continue_event = threading.Event()
self.exception_callback = exception_callback
self.exc_info = None
self._running = True
self.start()
def run(self):
while self._running:
try:
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task, args, kwargs = self.queue.get(block=True, timeout=.5)
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self.continue_event.clear()
self.received_task_event.clear()
self.done_event.clear()
self.exception_event.clear()
logger.debug("Received task")
self.received_task_event.set()
task(*args, **kwargs)
logger.debug("Task complete")
self.done_event.set()
except Queue.Empty:
pass
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except Exception as e:
logger.error(type(e).__name__ + " occurred, args=" + str(e.args) + "\n" + traceback.format_exc())
self.exc_info = sys.exc_info()
self.exception_event.set()
if self.exception_callback:
self.exception_callback(self, self.exc_info)
self.continue_event.wait()
def put(self, task, *args, **kwargs):
self.queue.put((task, args, kwargs))
def raise_exceptions(self):
if self.exception_event.is_set():
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six.reraise(self.exc_info[0], self.exc_info[1], self.exc_info[2])
def clear_exceptions(self):
self.exception_event.clear()
self.continue_event.set()
def stop(self):
self._running = False
class ThreadPool:
def __init__(self, num_threads=2):
self.tasks = Queue.Queue()
self.workers = [WorkerThread(self.on_exception, self.tasks) for _ in range(num_threads)]
self.num_threads = num_threads
self.exception_event = threading.Event()
self.exc_info = None
def put(self, func, *args, **kwargs):
self.tasks.put((func, args, kwargs))
def on_exception(self, worker_thread, exc_info):
self.exc_info = exc_info
self.exception_event.set()
worker_thread.continue_event.set()
def raise_exceptions(self):
if self.exception_event.is_set():
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six.reraise(self.exc_info[0], self.exc_info[1], self.exc_info[2])
def clear_exceptions(self):
self.exception_event.clear()
def close(self):
for worker in self.workers:
worker.stop()
for worker in self.workers:
worker.join()
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class AsyncTask:
def __init__(self, target, *args, **kwargs):
self.target = target
self.args = args
self.kwargs = kwargs
self.done = False
self.thread = threading.Thread(target=self._run)
self.thread.start()
def _run(self):
try:
self.result = self.target(*self.args, **self.kwargs)
except:
self.result = sys.exc_info()
self.done = True
def wait(self):
if not self.done:
self.thread.join()
if isinstance(self.result, BaseException):
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six.reraise(self.result[0], self.result[1], self.result[2])
else:
return self.result
def async():
def decorator(fn):
def wrapper(*args, **kwargs):
return AsyncTask(fn, *args, **kwargs)
return wrapper
return decorator
def is_string(var):
return isinstance(var, string_types)
def is_command(text):
"""
Checks if `text` is a command. Telegram chat commands start with the '/' character.
:param text: Text to check.
:return: True if `text` is a command, else False.
"""
return text.startswith('/')
def extract_command(text):
"""
Extracts the command from `text` (minus the '/') if `text` is a command (see is_command).
If `text` is not a command, this function returns None.
Examples:
extract_command('/help'): 'help'
extract_command('/help@BotName'): 'help'
extract_command('/search black eyed peas'): 'search'
extract_command('Good day to you'): None
:param text: String to extract the command from
:return: the command if `text` is a command (according to is_command), else None.
"""
return text.split()[0].split('@')[0][1:] if is_command(text) else None
def split_string(text, chars_per_string):
"""
Splits one string into multiple strings, with a maximum amount of `chars_per_string` characters per string.
This is very useful for splitting one giant message into multiples.
:param text: The text to split
:param chars_per_string: The number of characters per line the text is split into.
:return: The splitted text as a list of strings.
"""
return [text[i:i + chars_per_string] for i in range(0, len(text), chars_per_string)]
# CREDITS TO http://stackoverflow.com/questions/12317940#answer-12320352
def or_set(self):
self._set()
self.changed()
def or_clear(self):
self._clear()
self.changed()
def orify(e, changed_callback):
e._set = e.set
e._clear = e.clear
e.changed = changed_callback
e.set = lambda: or_set(e)
e.clear = lambda: or_clear(e)
def OrEvent(*events):
or_event = threading.Event()
def changed():
bools = [e.is_set() for e in events]
if any(bools):
or_event.set()
else:
or_event.clear()
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def busy_wait():
while not or_event.is_set():
or_event._wait(3)
for e in events:
orify(e, changed)
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or_event._wait = or_event.wait
or_event.wait = busy_wait
changed()
return or_event
def extract_arguments(text):
"""
Returns the argument after the command.
Examples:
extract_arguments("/get name"): 'name'
extract_arguments("/get"): ''
extract_arguments("/get@botName name"): 'name'
:param text: String to extract the arguments from a command
:return: the arguments if `text` is a command (according to is_command), else None.
"""
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regexp = re.compile("\/\w*(@\w*)*\s*([\s\S]*)",re.IGNORECASE)
result = regexp.match(text)
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return result.group(2) if is_command(text) else None
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def per_thread(key, construct_value):
try:
return getattr(thread_local, key)
except AttributeError:
value = construct_value()
setattr(thread_local, key, value)
return value