WebhookServer: Lock serve_forever() and shutdown()

telegram/utils/webhookhandler.py

@@ -2,6 +2,7 @@
 
 from telegram import Update, NullHandler
 from future.utils import bytes_to_native_str as n
+from threading import Lock
 import json
 try:
     import BaseHTTPServer
@@ -22,24 +23,29 @@ def __init__(self, server_address, RequestHandlerClass, update_queue,
         self.update_queue = update_queue
         self.webhook_path = webhook_path
         self.is_running = False
+        self.server_lock = Lock()
+        self.shutdown_lock = Lock()
 
     def serve_forever(self, poll_interval=0.5):
-        self.is_running = True
-        self.logger.info("Webhook Server started.")
-        super(WebhookServer, self).serve_forever(poll_interval)
-        self.logger.info("Webhook Server stopped.")
+        with self.server_lock:
+            self.is_running = True
+            self.logger.info("Webhook Server started.")
+            super(WebhookServer, self).serve_forever(poll_interval)
+            self.logger.info("Webhook Server stopped.")
 
     def shutdown(self):
-        if not self.is_running:
-            return
-        else:
-            super(WebhookServer, self).shutdown()
+        with self.shutdown_lock:
+            if not self.is_running:
+                return
+            else:
+                super(WebhookServer, self).shutdown()
+                self.is_running = False
 
 
 # WebhookHandler, process webhook calls
 # Based on: https://github.com/eternnoir/pyTelegramBotAPI/blob/master/
 # examples/webhook_examples/webhook_cpython_echo_bot.py
-class WebhookHandler(BaseHTTPServer.BaseHTTPRequestHandler, object):
+class WebhookHandler(BaseHTTPServer.BaseHTTPRequestHandler,    object):
     server_version = "WebhookHandler/1.0"
 
     def __init__(self, request, client_address, server):