Replace netaddr dependency with stdlib ipaddress

netaddr is quite a big library, and all we need is covered by
the built-in ipaddress module (available in python 3).

Also add a safeguard for invalid 'ip route' output.

Change-Id: I9d76a8d1c1b6b1585e301a9c63b37fab3b98746f

ironic_python_agent/agent.py

@@ -13,6 +13,7 @@
 # limitations under the License.
 
 import collections
+import ipaddress
 import os
 import random
 import select
@@ -23,7 +24,6 @@ from wsgiref import simple_server
 
 from ironic_lib import exception as lib_exc
 from ironic_lib import mdns
-import netaddr
 from oslo_concurrency import processutils
 from oslo_config import cfg
 from oslo_log import log
@@ -238,14 +238,22 @@ class IronicPythonAgent(base.ExecuteCommandMixin):
 
         try:
             source = out.strip().split('\n')[0].split('src')[1].split()[0]
-            if netaddr.IPAddress(source).is_link_local():
-                LOG.info('Ignoring link-local source to %(dest)s: %(rec)s',
-                         {'dest': dest, 'rec': out})
-                return
-            return source
         except IndexError:
             LOG.warning('No route to host %(dest)s, route record: %(rec)s',
                         {'dest': dest, 'rec': out})
+            return
+
+        try:
+            if ipaddress.ip_address(source).is_link_local:
+                LOG.info('Ignoring link-local source to %(dest)s: %(rec)s',
+                         {'dest': dest, 'rec': out})
+                return
+        except ValueError as exc:
+            LOG.warning('Invalid IP address %(addr)s returned as a route '
+                        'to host %(dest)s: %(err)s',
+                        {'dest': dest, 'addr': source, 'err': exc})
+
+        return source
 
     def set_agent_advertise_addr(self):
         """Set advertised IP address for the agent, if not already set.

ironic_python_agent/hardware.py

@@ -15,6 +15,7 @@
 import abc
 import binascii
 import functools
+import ipaddress
 import json
 from multiprocessing.pool import ThreadPool
 import os
@@ -24,7 +25,6 @@ import time
 
 from ironic_lib import disk_utils
 from ironic_lib import utils as il_utils
-import netaddr
 from oslo_concurrency import processutils
 from oslo_config import cfg
 from oslo_log import log
@@ -1320,9 +1320,9 @@ class GenericHardwareManager(HardwareManager):
                 out = out.strip()
 
                 try:
-                    netaddr.IPAddress(out)
-                except netaddr.AddrFormatError:
-                    LOG.warning('Invalid IP address: %s', out)
+                    ipaddress.ip_address(out)
+                except ValueError as exc:
+                    LOG.warning('Invalid IP address %s: %s', out, exc)
                     continue
 
                 # In case we get 0.0.0.0 on a valid channel, we need to keep
@@ -1397,9 +1397,9 @@ class GenericHardwareManager(HardwareManager):
                     continue
 
                 try:
-                    return str(netaddr.IPNetwork(address).ip)
-                except netaddr.AddrFormatError:
-                    LOG.warning('Invalid IP address: %s', address)
+                    return str(ipaddress.ip_interface(address).ip)
+                except ValueError as exc:
+                    LOG.warning('Invalid IP address %s: %s', address, exc)
                     continue
         except (processutils.ProcessExecutionError, OSError) as e:
             # Not error, because it's normal in virtual environment

lower-constraints.txt

@@ -37,7 +37,6 @@ mock==2.0.0
 monotonic==1.4
 mox3==0.25.0
 msgpack==0.5.6
-netaddr==0.7.18
 netifaces==0.10.4
 openstackdocstheme==1.20.0
 os-client-config==1.29.0

requirements.txt

@@ -3,7 +3,6 @@
 # process, which may cause wedges in the gate later.
 pbr!=2.1.0,>=2.0.0 # Apache-2.0
 eventlet!=0.18.3,!=0.20.1,>=0.18.2 # MIT
-netaddr>=0.7.18 # BSD
 netifaces>=0.10.4 # MIT
 oslo.config>=5.2.0 # Apache-2.0
 oslo.concurrency>=3.26.0 # Apache-2.0