Allow configure the number of http retries

Allow setting the maximum number of times we want to retry to
http_connect when communicating with the Identity service.

Closes-Bug: 1209194
Change-Id: I56bff55dc808a1188d42f1643a8018a8d49012c6

keystoneclient/middleware/auth_token.py

@@ -228,6 +228,10 @@ opts = [
                 default=None,
                 help='Request timeout value for communicating with Identity'
                 ' API server.'),
+    cfg.IntOpt('http_request_max_retries',
+               default=3,
+               help='How many times are we trying to reconnect when'
+               ' communicating with Identity API Server.'),
     cfg.StrOpt('http_handler',
                default=None,
                help='Allows to pass in the name of a fake http_handler'
@@ -428,7 +432,8 @@ class AuthProtocol(object):
         self.http_connect_timeout = (http_connect_timeout_cfg and
                                      int(http_connect_timeout_cfg))
         self.auth_version = None
-        self.http_request_max_retries = 3
+        self.http_request_max_retries = \
+            self._conf_get('http_request_max_retries')
 
     def _assert_valid_memcache_protection_config(self):
         if self._memcache_security_strategy:

tests/test_auth_token_middleware.py

@@ -26,6 +26,7 @@ import testtools
 import uuid
 
 import fixtures
+import mock
 import webob
 
 from keystoneclient.common import cms
@@ -1282,6 +1283,21 @@ class AuthTokenMiddlewareTest(BaseAuthTokenMiddlewareTest):
         self.middleware(req.environ, self.start_fake_response)
         self.assertEqual(self._get_cached_token(token), None)
 
+    def test_http_request_max_retries(self):
+        times_retry = 10
+
+        req = webob.Request.blank('/')
+        token = self.token_dict['uuid_token_default']
+        req.headers['X-Auth-Token'] = token
+
+        self.set_middleware(conf=dict(http_request_max_retries=times_retry))
+
+        with mock.patch('time.sleep') as mock_obj:
+            self.set_fake_http(RaisingHTTPNetworkError)
+            self.middleware(req.environ, self.start_fake_response)
+
+        self.assertEqual(mock_obj.call_count, times_retry)
+
 
 class CertDownloadMiddlewareTest(BaseAuthTokenMiddlewareTest):
     def setUp(self):