Merge "[LLDP] Skip NICs that say they are ready but are unreadable."

ironic_python_agent/netutils.py

@@ -182,10 +182,17 @@ def _get_lldp_info(interfaces):
             # Create a copy of interfaces to avoid deleting while iterating.
             for index, interface in enumerate(list(interfaces)):
                 if s == interface[1]:
-                    LOG.info('Found LLDP info for interface: %s',
-                             interface[0])
-                    lldp_info[interface[0]] = (
-                        _receive_lldp_packets(s))
+                    try:
+                        lldp_info[interface[0]] = _receive_lldp_packets(s)
+                    except socket.error:
+                        LOG.exception('Socket for network interface %s said '
+                                      'that it was ready to read we were '
+                                      'unable to read from the socket while '
+                                      'trying to get LLDP packet. Skipping '
+                                      'this network interface.', interface[0])
+                    else:
+                        LOG.info('Found LLDP info for interface: %s',
+                                 interface[0])
                     # Remove interface from the list, only need one packet
                     del interfaces[index]
 

ironic_python_agent/tests/unit/test_netutils.py

@@ -13,6 +13,7 @@
 # limitations under the License.
 
 import binascii
+import socket
 
 import mock
 from oslo_config import cfg
@@ -89,6 +90,50 @@ class TestNetutils(base.IronicAgentTest):
         # 2 interfaces, 2 calls to enter promiscuous mode, 1 to leave
         self.assertEqual(6, fcntl_mock.call_count)
 
+    @mock.patch('fcntl.ioctl', autospec=True)
+    @mock.patch('select.select', autospec=True)
+    @mock.patch('socket.socket', autospec=socket_socket_sig)
+    def test_get_lldp_info_socket_recv_error(self, sock_mock, select_mock,
+                                             fcntl_mock):
+        expected_lldp = {
+            'eth1': [
+                (0, b''),
+                (1, b'\x04\x88Z\x92\xecTY'),
+                (2, b'\x05Ethernet1/18'),
+                (3, b'\x00x')]
+        }
+
+        interface_names = ['eth0', 'eth1']
+
+        sock1 = mock.Mock()
+        sock1.recv.side_effect = socket.error("BOOM")
+
+        sock2 = mock.Mock()
+        sock2.recv.return_value = FAKE_LLDP_PACKET
+        sock2.fileno.return_value = 5
+
+        sock_mock.side_effect = [sock1, sock2]
+
+        select_mock.side_effect = [
+            ([sock1], [], []),
+            ([sock2], [], [])
+        ]
+
+        lldp_info = netutils.get_lldp_info(interface_names)
+        self.assertEqual(expected_lldp, lldp_info)
+
+        sock1.bind.assert_called_with(('eth0', netutils.LLDP_ETHERTYPE))
+        sock2.bind.assert_called_with(('eth1', netutils.LLDP_ETHERTYPE))
+
+        sock1.recv.assert_called_with(1600)
+        sock2.recv.assert_called_with(1600)
+
+        self.assertEqual(1, sock1.close.call_count)
+        self.assertEqual(1, sock2.close.call_count)
+
+        # 2 interfaces, 2 calls to enter promiscuous mode, 1 to leave
+        self.assertEqual(6, fcntl_mock.call_count)
+
     @mock.patch('fcntl.ioctl', autospec=True)
     @mock.patch('select.select', autospec=True)
     @mock.patch('socket.socket', autospec=socket_socket_sig)

releasenotes/notes/LLDP-ignore-NICs-that-are-not-plugged-in-29213f0a701a72e4.yaml

@@ -0,0 +1,7 @@
+---
+fixes:
+  - |
+    Fixes bug in LLDP discovery code which lead to no LLDP information being
+    discovered for any network interface if one network interface raised an
+    exception, for example if the network interface incorrectly indicates its
+    ready to read. `<https://bugs.launchpad.net/ironic-python-agent/+bug/1665025>`_