Friendlier error message when Tor is closed or network is down

Signed-off-by: Jesús <heckyel@hyperbola.info>

youtube/__init__.py

@@ -108,6 +108,12 @@ def error_page(e):
         if exc_info()[1].ip:
             error_message += '\n\nExit node IP address: ' + exc_info()[1].ip
         return flask.render_template('error.html', error_message=error_message, slim=slim), 502
+    elif exc_info()[0] == util.FetchError and exc_info()[1].error_message:
+        return (flask.render_template(
+                    'error.html',
+                    error_message=exc_info()[1].error_message,
+                    slim=slim
+                ), 502)
     return flask.render_template('error.html', traceback=traceback.format_exc(), slim=slim), 500
 
 

youtube/util.py

@@ -240,6 +240,7 @@ def fetch_url_response(url, headers=(), timeout=15, data=None,
         elif not isinstance(data, bytes):
             data = urllib.parse.urlencode(data).encode('utf-8')
 
+
     if cookiejar_send is not None or cookiejar_receive is not None:     # Use urllib
         req = urllib.request.Request(url, data=data, headers=headers)
 
@@ -263,9 +264,27 @@ def fetch_url_response(url, headers=(), timeout=15, data=None,
         else:
             retries = urllib3.Retry(3)
         pool = get_pool(use_tor and settings.route_tor)
-        response = pool.request(method, url, headers=headers, body=data,
-                                timeout=timeout, preload_content=False,
-                                decode_content=False, retries=retries)
+        try:
+            response = pool.request(method, url, headers=headers, body=data,
+                                    timeout=timeout, preload_content=False,
+                                    decode_content=False, retries=retries)
+        except urllib3.exceptions.MaxRetryError as e:
+            exception_cause = e.__context__.__context__
+            if (isinstance(exception_cause, socks.ProxyConnectionError)
+                    and settings.route_tor):
+                msg = ('Failed to connect to Tor. Check that Tor is open and '
+                       'that your internet connection is working.\n\n'
+                       + str(e))
+                raise FetchError('502', reason='Bad Gateway',
+                                 error_message=msg)
+            elif isinstance(e.__context__,
+                            urllib3.exceptions.NewConnectionError):
+                msg = 'Failed to establish a connection.\n\n' + str(e)
+                raise FetchError(
+                    '502', reason='Bad Gateway',
+                     error_message=msg)
+            else:
+                raise
         cleanup_func = (lambda r: r.release_conn())
 
     return response, cleanup_func