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[Sreekumar S <sreesiv@xxxxxxxxx>]

** Also affects: horizon
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1521868

Title:
  [RFE] API to fetch published configurations

Status in OpenStack Dashboard (Horizon):
  New
Status in neutron:
  New

Bug description:
  Neutron clients like Horizon and CLI depend on redundant settings or
  hard coded values for configurations that are specific to the
  functionality of neutron and its sub-agents. For example Horizon has
  settings for 'supported_provider_types', 'segmentation_id_range' and
  'extra_provider_types' (proposed). There have been requests/bugs to
  neutron team to add APIs to fetch these values, so that the API
  consumers don't have to hard code or add their own configurations and
  keep in them in sync. In the case of multiple configuration settings,
  the admin must also know and keep track to set both configurations in
  his environment.

  This RFE proposes to add a standard identity/role based configuration
  fetching API for accessing the current exposed configuration. Exposed
  keys and their corresponding namespaces should be published by neutron
  and its sub-modules.

  Setting or modifying configuration (static or dynamic) is not
  achievable through the config APIs. For this the client/admin should
  resort to the individual/specific APIs exposed or modify the config
  files themselves.

  Underlying configuration implementation can also be specific to
  neutron, it could be configdb, *.ini/*.conf file or anything else.

  The neutron config API should expose a unified parent/root namespace from which all other namespaces specific to each sub-agent is accessible.
  For example...
  /ml2/ml2_type_gre/tunnel_id_ranges -- for ml2 agent
  /l3/interface_driver -- for l3 agent
  /dhcp/dhcp_driver -- for dhcp agent
  /ml2/* -- for ml2 agent

  This RFE proposes a new section in network API for 'Configuration',
  along with 'Networks', 'Subnets', 'Ports', and 'Service providers'.

  Example:
  GET - /v2.0/config -- List all configuration
  GET - /v2.0/config/l3 -- List l3 specific ones.
  GET - /v2.0/config/ml2/ml2_type_gre -- List everything under /ml2/ml2_type_gre/*
  GET - /v2.0/config/ml2/type_drivers -- Value for 'type_drivers' key inside ml2, returning for eg. "flat,vlan,gre,vxlan"

  Such an interface for configuration fetching could be followed suit by other projects as well, like may be nova, cinder etc which may have their own configuration namespaces to expose.
  It's like an OpenStack equivalent of /proc file system without the set/mod capability.

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