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[Alexey Stupnikov <1747167@xxxxxxxxxxxxxxxxxx>]

Changing bug's status to fix released as recent releases are no longer
affected

** Changed in: nova
       Status: Confirmed => Fix Released

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https://bugs.launchpad.net/bugs/1747167

Title:
  Neutron driver handles incorrectly 404 errors

Status in OpenStack Compute (nova):
  Fix Released

Bug description:
  Neutronclient transforms errors using exception_handler_v20[1].
  In particular, it transforms 404 responses into:
   1) [2] neutronclient.common.exceptions.<type>Client if response body contains a type attribute (with value <type>, type examples: NetworkNotFound, PortNotFound) and <type>Client exists
   2) [3] neutronclient.common.NotFound otherwise

  Nova neutron driver[4] supports mostly 1) but not 2).
  But Neutron in case of 404 returns the following body:

    {"message": "The resource could not be found.<br /><br />\n\n\n",
  "code": "404 Not Found", "title": "Not Found"}

  and we end in 2) and Nova Neutron driver doesn't catch the error
  correctly and raises a 500

  You can reproduce it indirectly using:
   openstack server add fixed ip <vm> <network-name>

  which queries:
   nova-base-url/os-networks/<network-name>

  assuming it would return the network or a 404 but it returns 500.


  This trouble can be solved by catching NotFound instead of
  NetworkNotFoundClient/PortNotFoundClient as there are subclasses of
  NotFound.


  
  [1] https://github.com/openstack/python-neutronclient/blob/6a2112e1824980af1bc9216441fa58a7dfd00988/neutronclient/v2_0/client.py#L47-L93
  [2] https://github.com/openstack/python-neutronclient/blob/6a2112e1824980af1bc9216441fa58a7dfd00988/neutronclient/v2_0/client.py#L71
  [3] https://github.com/openstack/python-neutronclient/blob/6a2112e1824980af1bc9216441fa58a7dfd00988/neutronclient/v2_0/client.py#L85
  [4] nova.network.neutronv2.api

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