Gather information about configuration from multiple URLs

Patch add functionality for gathering informatio about
configuration and server list from multiple URLs.
URLs prefix is defined via global variables.

Author Dubravko Penezic

speedtest_cli.py

@@ -34,6 +34,13 @@ shutdown_event = None
 # Used for bound_interface
 socket_socket = socket.socket
 
+# Config server URL prefix
+conf_server_urls_prefix = [
+        'http://www.speedtest.net/',
+        'https://www.speedtest.net/',
+        'http://c.speedtest.net/',
+    ] 
+
 try:
     import xml.etree.cElementTree as ET
 except ImportError:
@@ -145,6 +152,12 @@ class SpeedtestCliServerListError(Exception):
 
     """
 
+class SpeedtestConfigDataError(Exception):
+    """Internal Exception class used to indicate to move on to the next
+    URL for retrieving speedtest.net configuration details
+
+    """
+
 
 def bound_socket(*args, **kwargs):
     """Bind socket to a specified source IP address"""
@@ -340,18 +353,22 @@ def getConfig():
     we are interested in
     """
     
-    request = build_request('https://www.speedtest.net/speedtest-config.php')
+    config = {}
+    for url_prefix in conf_server_urls_prefix:
+        url = url_prefix+'speedtest-config.php'
+        try:
+            request = build_request(url)
             uh = catch_request(request)
             if uh is False:
-        print_('Could not retrieve speedtest.net configuration')
-        sys.exit(1)
+                raise SpeedtestConfigDataError
             configxml = []
             while 1:
                 configxml.append(uh.read(10240))
                 if len(configxml[-1]) == 0:
                     break
             if int(uh.code) != 200:
-        return None
+                uh.close
+                raise SpeedtestConfigDataError
             uh.close()
             try:
                 try:
@@ -369,10 +386,21 @@ def getConfig():
                         'download': getAttributesByTagName(root, 'download'),
                         'upload': getAttributesByTagName(root, 'upload')}
             except SyntaxError:
-        print_('Failed to parse speedtest.net configuration')
-        sys.exit(1)
+                raise SpeedtestConfigDataError
             del root
             del configxml
+        except SpeedtestConfigDataError:
+            continue
+
+        # We were able to fetch and parse the list of speedtest.net servers
+        if config:
+            break
+
+    if not config:
+        print_('Could not retrieve speedtest.net configuration')
+        sys.exit(1)
+
+
     return config
 
 
@@ -381,12 +409,9 @@ def closestServers(client, all=False):
     distance
     """
 
-    urls = [
-        'https://www.speedtest.net/speedtest-servers-static.php',
-        'http://c.speedtest.net/speedtest-servers-static.php',
-    ]
     servers = {}
-    for url in urls:
+    for url_prefix in conf_server_urls_prefix:
+        url = url_prefix+'speedtest-servers-static.php'
         try:
             request = build_request(url)
             uh = catch_request(request)