Better error handling.

Errors now are re-raised in the Thread polling() was called from.
If none_stop is *not* set, ApiExceptions will cause the calling Thread to halt.

telebot/__init__.py

@@ -10,7 +10,9 @@ import six
 import logging
 
 logger = logging.getLogger('TeleBot')
-formatter = logging.Formatter('%(asctime)s (%(filename)s:%(lineno)d) %(levelname)s - %(name)s: "%(message)s"')
+formatter = logging.Formatter(
+    '%(asctime)s (%(filename)s:%(lineno)d %(threadName)s) %(levelname)s - %(name)s: "%(message)s"'
+)
 
 console_output_handler = logging.StreamHandler(sys.stderr)
 console_output_handler.setFormatter(formatter)
@@ -42,20 +44,17 @@ class TeleBot:
         getUpdates
     """
 
-    def __init__(self, token, create_threads=True, num_threads=4):
+    def __init__(self, token):
         """
         :param token: bot API token
-        :param create_threads: Create thread for message handler
-        :param num_threads: Number of worker in thread pool.
         :return: Telebot object.
         """
         self.token = token
         self.update_listener = []
-        self.polling_thread = None
+
         self.__stop_polling = threading.Event()
         self.last_update_id = 0
-        self.num_threads = num_threads
+        self.exc_info = None
-        self.__create_threads = create_threads
 
         self.message_subscribers_messages = []
         self.message_subscribers_callbacks = []
@@ -65,8 +64,7 @@ class TeleBot:
         self.message_subscribers_next_step = {}
 
         self.message_handlers = []
-        if self.__create_threads:
+        self.worker_pool = util.ThreadPool()
-            self.worker_pool = util.ThreadPool(num_threads)
 
     def set_webhook(self, url=None, certificate=None):
         return apihelper.set_webhook(self.token, url, certificate)
@@ -88,12 +86,13 @@ class TeleBot:
             ret.append(types.Update.de_json(ju))
         return ret
 
-    def get_update(self, timeout=20):
+    def __retrieve_updates(self, timeout=20):
         """
         Retrieves any updates from the Telegram API.
         Registered listeners and applicable message handlers will be notified when a new message arrives.
         :raises ApiException when a call has failed.
         """
+        raise apihelper.ApiException("Test2", None, None)
         updates = self.get_updates(offset=(self.last_update_id + 1), timeout=timeout)
         new_messages = []
         for update in updates:
@@ -112,57 +111,52 @@ class TeleBot:
 
     def __notify_update(self, new_messages):
         for listener in self.update_listener:
-            if self.__create_threads:
             self.worker_pool.put(listener, new_messages)
-            else:
-                listener(new_messages)
 
-    def polling(self, none_stop=False, interval=0, block=True, timeout=20):
+    def polling(self, none_stop=False, interval=0, timeout=20):
         """
-        This function creates a new Thread that calls an internal __polling function.
+        This function creates a new Thread that calls an internal __retrieve_updates function.
         This allows the bot to retrieve Updates automagically and notify listeners and message handlers accordingly.
 
-        Do not call this function more than once!
+        Warning: Do not call this function more than once!
 
         Always get updates.
-        :param none_stop: Do not stop polling when Exception occur.
+        :param none_stop: Do not stop polling when an ApiException occurs.
         :param timeout: Timeout in seconds for long polling.
         :return:
         """
-        self.__stop_polling.set()
-        if self.polling_thread:
-            self.polling_thread.join()  # wait thread stop.
-        self.__stop_polling.clear()
-        self.polling_thread = threading.Thread(target=self.__polling, args=([none_stop, interval, timeout]))
-        self.polling_thread.daemon = True
-        self.polling_thread.start()
-
-        if block:
-            while self.polling_thread.is_alive:
-                try:
-                    time.sleep(.1)
-                except KeyboardInterrupt:
-                    logger.info("Received KeyboardInterrupt. Stopping.")
-                    self.stop_polling()
-                    self.polling_thread.join()
-                    break
-
-    def __polling(self, none_stop, interval, timeout):
         logger.info('Started polling.')
 
         error_interval = .25
+
+        polling_thread = util.WorkerThread(name="PollingThread")
+        or_event = util.OrEvent(
+            polling_thread.done_event,
+            polling_thread.exception_event,
+            self.worker_pool.exception_event
+        )
+
         while not self.__stop_polling.wait(interval):
+            or_event.clear()
             try:
-                self.get_update(timeout)
+                polling_thread.put(self.__retrieve_updates, timeout)
+                or_event.wait()
+
+                polling_thread.raise_exceptions()
+                self.worker_pool.raise_exceptions()
+
                 error_interval = .25
             except apihelper.ApiException as e:
+                logger.error(e)
                 if not none_stop:
                     self.__stop_polling.set()
                     logger.info("Exception occurred. Stopping.")
                 else:
+                    polling_thread.clear_exceptions()
+                    self.worker_pool.clear_exceptions()
+                    logger.info("Waiting for {0} seconds until retry".format(error_interval))
                     time.sleep(error_interval)
                     error_interval *= 2
-                logger.error(e)
 
         logger.info('Stopped polling.')
 
@@ -459,10 +453,7 @@ class TeleBot:
         for message in new_messages:
             for message_handler in self.message_handlers:
                 if self._test_message_handler(message_handler, message):
-                    if self.__create_threads:
                     self.worker_pool.put(message_handler['function'], message)
-                    else:
-                        message_handler['function'](message)
                     break
 
 

telebot/util.py

@@ -1,6 +1,7 @@
 # -*- coding: utf-8 -*-
 
 import threading
+import sys
 from six import string_types
 
 # Python3 queue support.
@@ -9,45 +10,97 @@ try:
 except ImportError:
     import queue as Queue
 
-from apihelper import ApiException
 from telebot import logger
 
 
-class ThreadPool:
 class WorkerThread(threading.Thread):
         count = 0
 
-        def __init__(self, queue):
+        def __init__(self, exception_callback=None, queue=Queue.Queue(), name=None):
-            threading.Thread.__init__(self, name="WorkerThread{0}".format(self.__class__.count + 1))
+            if not name:
+                name = "WorkerThread{0}".format(self.__class__.count + 1)
                 self.__class__.count += 1
+
+            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:
+                self.continue_event.clear()
+                self.received_task_event.clear()
+                self.done_event.clear()
+                self.exception_event.clear()
+
                 try:
                     task, args, kwargs = self.queue.get(block=True, timeout=.01)
+                    logger.debug("Received task")
+                    self.received_task_event.set()
+
                     task(*args, **kwargs)
+                    logger.debug("Task complete")
+                    self.done_event.set()
                 except Queue.Empty:
                     pass
-                except ApiException as e:
+                except:
-                    logger.exception(e)
+                    logger.debug("Exception occurred")
+                    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():
+                raise 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
 
-    def __init__(self, num_threads=4):
-        self.tasks = Queue.Queue()
-        self.workers = [self.WorkerThread(self.tasks) for _ in range(num_threads)]
 
+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():
+            raise 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()
@@ -68,15 +121,15 @@ class AsyncTask:
     def _run(self):
         try:
             self.result = self.target(*self.args, **self.kwargs)
-        except Exception as e:
+        except:
-            self.result = e
+            self.result = sys.exc_info()
         self.done = True
 
     def wait(self):
         if not self.done:
             self.thread.join()
-        if isinstance(self.result, Exception):
+        if isinstance(self.result, BaseException):
-            raise self.result
+            raise self.result[0], self.result[1], self.result[2]
         else:
             return self.result
 
@@ -130,3 +183,35 @@ def split_string(text, chars_per_string):
     :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()
+    for e in events:
+        orify(e, changed)
+    changed()
+    return or_event