Set TCP keepalive options

The following configuration options are in the sample config
but are not used:

- tcp_keepalive
- tcp_keepidle
- tcp_keepalive_interval
- tcp_keepalive_count

Use the utility function from oslo_utils to set the socket options.

Change-Id: I38f501202184792f12bf153a800e39a4b1a3fccb
Closes-Bug: #1554022

manila/tests/test_wsgi.py

@@ -24,6 +24,7 @@ import ddt
 import eventlet
 import mock
 from oslo_config import cfg
+from oslo_utils import netutils
 import six
 from six.moves import urllib
 import testtools
@@ -115,6 +116,32 @@ class TestWSGIServer(test.TestCase):
         server.stop()
         server.wait()
 
+    def test_start_with_default_tcp_options(self):
+        server = manila.wsgi.Server("test_tcp_options",
+                                    None,
+                                    host="127.0.0.1")
+        self.mock_object(
+            netutils, 'set_tcp_keepalive')
+        server.start()
+        netutils.set_tcp_keepalive.assert_called_once_with(
+            mock.ANY, tcp_keepalive=True, tcp_keepalive_count=None,
+            tcp_keepalive_interval=None, tcp_keepidle=600)
+
+    def test_start_with_custom_tcp_options(self):
+        CONF.set_default("tcp_keepalive", False)
+        CONF.set_default("tcp_keepalive_count", 33)
+        CONF.set_default("tcp_keepalive_interval", 22)
+        CONF.set_default("tcp_keepidle", 11)
+        server = manila.wsgi.Server("test_tcp_options",
+                                    None,
+                                    host="127.0.0.1")
+        self.mock_object(
+            netutils, 'set_tcp_keepalive')
+        server.start()
+        netutils.set_tcp_keepalive.assert_called_once_with(
+            mock.ANY, tcp_keepalive=False, tcp_keepalive_count=33,
+            tcp_keepalive_interval=22, tcp_keepidle=11)
+
     def test_app(self):
         self.mock_object(
             eventlet, 'spawn', mock.Mock(side_effect=eventlet.spawn))

manila/wsgi.py

@@ -33,6 +33,7 @@ from oslo_config import cfg
 from oslo_log import log
 from oslo_service import service
 from oslo_utils import excutils
+from oslo_utils import netutils
 from paste import deploy
 import routes.middleware
 import webob.dec
@@ -199,6 +200,15 @@ class Server(service.ServiceBase):
         # to keep file descriptor usable.
 
         dup_socket = self._socket.dup()
+
+        netutils.set_tcp_keepalive(
+            dup_socket,
+            tcp_keepalive=CONF.tcp_keepalive,
+            tcp_keepidle=CONF.tcp_keepidle,
+            tcp_keepalive_interval=CONF.tcp_keepalive_interval,
+            tcp_keepalive_count=CONF.tcp_keepalive_count
+        )
+
         if self._use_ssl:
             try:
                 ssl_kwargs = {
@@ -218,10 +228,6 @@ class Server(service.ServiceBase):
                 dup_socket.setsockopt(socket.SOL_SOCKET,
                                       socket.SO_REUSEADDR, 1)
 
-                # sockets can hang around forever without keepalive
-                dup_socket.setsockopt(socket.SOL_SOCKET,
-                                      socket.SO_KEEPALIVE, 1)
-
             except Exception:
                 with excutils.save_and_reraise_exception():
                     LOG.error(