Disable reverse dns lookup

The BaseHTTPServer will do a reverse dns lookup when log message, which
will cause 10 seconds latency in some network environment. This will
significantly slow down the api request when wsgiref.simple_server is
used.

Change-Id: I0c8de84665f9a68290a26874aa555a881e8f1ca2
Closes-Bug: #1291229

cloudpulse/api/app.py

@@ -39,7 +39,13 @@ API_SERVICE_OPTS = [
     cfg.IntOpt('max_limit',
                default=1000,
                help='The maximum number of items returned in a single '
-                    'response from a collection resource.')
+                    'response from a collection resource.'),
+    cfg.BoolOpt('enable_reverse_dns_lookup',
+                default=False,
+                help=('Set it to False if your environment does not need '
+                      'or have dns server, otherwise it will delay the '
+                      'response from api.')
+                )
 ]
 
 CONF = cfg.CONF

cloudpulse/cmd/api.py

@@ -30,6 +30,20 @@ from cloudpulse.openstack.common import log as logging
 LOG = logging.getLogger(__name__)
 
 
+def get_handler_cls():
+    cls = simple_server.WSGIRequestHandler
+
+    class CloudpulseHandler(cls, object):
+
+        def address_string(self):
+            if cfg.CONF.api.enable_reverse_dns_lookup:
+                return super(CloudpulseHandler, self).address_string()
+            else:
+                return self.client_address[0]
+
+    return CloudpulseHandler
+
+
 def main():
     service.prepare_service(sys.argv)
 
@@ -37,7 +51,8 @@ def main():
 
     # Create the WSGI server and start it
     host, port = cfg.CONF.host, cfg.CONF.port
-    srv = simple_server.make_server(host, port, app)
+    srv = simple_server.make_server(
+        host, port, app, handler_class=get_handler_cls())
 
     LOG.info(_LI('Starting server in PID %s') % os.getpid())
     LOG.debug("Configuration:")