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[lucky <1764372@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

An extra call is made to nova-api for fetching server details to check it's existence. 
Once existence of server is confirmed, after that  "server migration list" call is made to nova-api.
In existing nova cli code flow, if server does not exist and "nova server-migration-list {server-id}" is invoked, it will display error to user and will not execute server migration list API call. 
In contrary, if user directly execute curl command to fetch migration list for server which does not exists, then also same error message is displayed to user.
So, it seems extra call to check existence of server.

Solution:
Code should be improved to eliminate extra nova-api call to check server existence before executing concerned command.
Server migration list can directly be executed through curl to avoid extra call to check server existence before invoking server migration list.
curl -g -i -X GET http://{hostip}:8774/v2.1/{tenant_id}/servers/{server_id}/migrations  -H "Accept: application/json" -H "X-OpenStack-Nova-API-Version: 2.23" -H "X-Auth-Token:{token_id}".

** Affects: nova
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1764372

Title:
  while executing ServerMigrationList use-case an extra call is made to
  nova-api for fetching server details.

Status in OpenStack Compute (nova):
  New

Bug description:
  An extra call is made to nova-api for fetching server details to check it's existence. 
  Once existence of server is confirmed, after that  "server migration list" call is made to nova-api.
  In existing nova cli code flow, if server does not exist and "nova server-migration-list {server-id}" is invoked, it will display error to user and will not execute server migration list API call. 
  In contrary, if user directly execute curl command to fetch migration list for server which does not exists, then also same error message is displayed to user.
  So, it seems extra call to check existence of server.

  Solution:
  Code should be improved to eliminate extra nova-api call to check server existence before executing concerned command.
  Server migration list can directly be executed through curl to avoid extra call to check server existence before invoking server migration list.
  curl -g -i -X GET http://{hostip}:8774/v2.1/{tenant_id}/servers/{server_id}/migrations  -H "Accept: application/json" -H "X-OpenStack-Nova-API-Version: 2.23" -H "X-Auth-Token:{token_id}".

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