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[Thierry Carrez <thierry.carrez+lp@xxxxxxxxx>]

** Changed in: horizon
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1495191

Title:
  Create subnet from subnetpool fails in stable/liberty

Status in OpenStack Dashboard (Horizon):
  Fix Released

Bug description:
  Horizon message:
  Error: Failed to create subnet "" for network "None": Request Failed: internal server error while processing your request.

  Neutron API message:
  2015-09-13 08:30:19.545 DEBUG neutron.api.v2.base [req-9e0ac82f-7bec-4627-bce4-da79637de47f demo a73d9746878b47e6b3ac4dfd57d212bd] Request body: {u'subnet': {u'name': u'subnet3', u'enable_dhcp': True, u'network_id': u'ad740c45-436a-4c65-ad13-982e034279be', u'tenant_id': u'a73d9746878b47e6b3ac4dfd57d212bd', u'ip_version': 4, u'prefixlen': u'24', u'cidr': None, u'subnetpool_id': u'48806e89-553f-4479-81e2-62120d07f972'}} from (pid=25643) prepare_request_body /opt/stack/neutron/neutron/api/v2/base.py:620
  2015-09-13 08:30:19.600 ERROR neutron.api.v2.resource [req-9e0ac82f-7bec-4627-bce4-da79637de47f demo a73d9746878b47e6b3ac4dfd57d212bd] create failed
  2015-09-13 08:30:19.600 TRACE neutron.api.v2.resource Traceback (most recent call last):
  2015-09-13 08:30:19.600 TRACE neutron.api.v2.resource   File "/opt/stack/neutron/neutron/api/v2/resource.py", line 83, in resource
  2015-09-13 08:30:19.600 TRACE neutron.api.v2.resource     result = method(request=request, **args)
  2015-09-13 08:30:19.600 TRACE neutron.api.v2.resource   File "/usr/local/lib/python2.7/dist-packages/oslo_db/api.py", line 146, in wrapper
  2015-09-13 08:30:19.600 TRACE neutron.api.v2.resource     ectxt.value = e.inner_exc
  2015-09-13 08:30:19.600 TRACE neutron.api.v2.resource   File "/usr/local/lib/python2.7/dist-packages/oslo_utils/excutils.py", line 195, in __exit__
  2015-09-13 08:30:19.600 TRACE neutron.api.v2.resource     six.reraise(self.type_, self.value, self.tb)
  2015-09-13 08:30:19.600 TRACE neutron.api.v2.resource   File "/usr/local/lib/python2.7/dist-packages/oslo_db/api.py", line 136, in wrapper
  2015-09-13 08:30:19.600 TRACE neutron.api.v2.resource     return f(*args, **kwargs)
  2015-09-13 08:30:19.600 TRACE neutron.api.v2.resource   File "/opt/stack/neutron/neutron/api/v2/base.py", line 491, in create
  2015-09-13 08:30:19.600 TRACE neutron.api.v2.resource     obj = obj_creator(request.context, **kwargs)
  2015-09-13 08:30:19.600 TRACE neutron.api.v2.resource   File "/opt/stack/neutron/neutron/plugins/ml2/plugin.py", line 835, in create_subnet
  2015-09-13 08:30:19.600 TRACE neutron.api.v2.resource     result, mech_context = self._create_subnet_db(context, subnet)
  2015-09-13 08:30:19.600 TRACE neutron.api.v2.resource   File "/opt/stack/neutron/neutron/plugins/ml2/plugin.py", line 824, in _create_subnet_db
  2015-09-13 08:30:19.600 TRACE neutron.api.v2.resource     result = super(Ml2Plugin, self).create_subnet(context, subnet)
  2015-09-13 08:30:19.600 TRACE neutron.api.v2.resource   File "/opt/stack/neutron/neutron/db/db_base_plugin_v2.py", line 667, in create_subnet
  2015-09-13 08:30:19.600 TRACE neutron.api.v2.resource     return self._create_subnet(context, subnet, subnetpool_id)
  2015-09-13 08:30:19.600 TRACE neutron.api.v2.resource   File "/opt/stack/neutron/neutron/db/db_base_plugin_v2.py", line 583, in _create_subnet
  2015-09-13 08:30:19.600 TRACE neutron.api.v2.resource     subnetpool_id)
  2015-09-13 08:30:19.600 TRACE neutron.api.v2.resource   File "/opt/stack/neutron/neutron/db/ipam_non_pluggable_backend.py", line 446, in allocate_subnet
  2015-09-13 08:30:19.600 TRACE neutron.api.v2.resource     subnet['cidr'])
  2015-09-13 08:30:19.600 TRACE neutron.api.v2.resource   File "/opt/stack/neutron/neutron/db/ipam_backend_mixin.py", line 52, in _gateway_ip_str
  2015-09-13 08:30:19.600 TRACE neutron.api.v2.resource     return str(netaddr.IPNetwork(cidr_net).network + 1)
  2015-09-13 08:30:19.600 TRACE neutron.api.v2.resource   File "/usr/local/lib/python2.7/dist-packages/netaddr/ip/__init__.py", line 923, in __init__
  2015-09-13 08:30:19.600 TRACE neutron.api.v2.resource     implicit_prefix, flags)
  2015-09-13 08:30:19.600 TRACE neutron.api.v2.resource   File "/usr/local/lib/python2.7/dist-packages/netaddr/ip/__init__.py", line 818, in parse_ip_network
  2015-09-13 08:30:19.600 TRACE neutron.api.v2.resource     raise TypeError('unexpected type %s for addr arg' % type(addr))
  2015-09-13 08:30:19.600 TRACE neutron.api.v2.resource TypeError: unexpected type <type 'NoneType'> for addr arg
  2015-09-13 08:30:19.600 TRACE neutron.api.v2.resource 

  Analysis:
  When we create a subnet with subnetpool cidr is set to None. A recent change in Neutron or netaddr now makes this an error.

  Proposed fix:
  Update Horizon Neutron Client bindings and make cidr and ip_version optional.
  Update Horizon networks workflow to only pass cidr and ip_version fields if they are used instead of passing along "None".

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