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"""
@@ -339,40 +352,55 @@ def getConfig():
     """Download the speedtest.net configuration and return only the data
     we are interested in
     """
+    
+    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:
+                raise SpeedtestConfigDataError
+            configxml = []
+            while 1:
+                configxml.append(uh.read(10240))
+                if len(configxml[-1]) == 0:
+                    break
+            if int(uh.code) != 200:
+                uh.close
+                raise SpeedtestConfigDataError
+            uh.close()
+            try:
+                try:
+                    root = ET.fromstring(''.encode().join(configxml))
+                    config = {
+                        'client': root.find('client').attrib,
+                        'times': root.find('times').attrib,
+                        'download': root.find('download').attrib,
+                        'upload': root.find('upload').attrib}
+                except AttributeError:  # Python3 branch
+                    root = DOM.parseString(''.join(configxml))
+                    config = {
+                        'client': getAttributesByTagName(root, 'client'),
+                        'times': getAttributesByTagName(root, 'times'),
+                        'download': getAttributesByTagName(root, 'download'),
+                        'upload': getAttributesByTagName(root, 'upload')}
+            except SyntaxError:
+                raise SpeedtestConfigDataError
+            del root
+            del configxml
+        except SpeedtestConfigDataError:
+            continue
 
-    request = build_request('https://www.speedtest.net/speedtest-config.php')
+        # We were able to fetch and parse the list of speedtest.net servers
-    uh = catch_request(request)
+        if config:
-    if uh is False:
+            break
+
+    if not config:
         print_('Could not retrieve speedtest.net configuration')
         sys.exit(1)
-    configxml = []
+
-    while 1:
+
-        configxml.append(uh.read(10240))
-        if len(configxml[-1]) == 0:
-            break
-    if int(uh.code) != 200:
-        return None
-    uh.close()
-    try:
-        try:
-            root = ET.fromstring(''.encode().join(configxml))
-            config = {
-                'client': root.find('client').attrib,
-                'times': root.find('times').attrib,
-                'download': root.find('download').attrib,
-                'upload': root.find('upload').attrib}
-        except AttributeError:  # Python3 branch
-            root = DOM.parseString(''.join(configxml))
-            config = {
-                'client': getAttributesByTagName(root, 'client'),
-                'times': getAttributesByTagName(root, 'times'),
-                'download': getAttributesByTagName(root, 'download'),
-                'upload': getAttributesByTagName(root, 'upload')}
-    except SyntaxError:
-        print_('Failed to parse speedtest.net configuration')
-        sys.exit(1)
-    del root
-    del configxml
     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)