cFouts c34e3b7d2c Nova Style API Version Support for Client ...

The Manila client needs the following changes to support microversions:

*   Maintain backwards compatibility with Kilo. When the client detects
    that the server doesn't support microversions it will fall back to
    using the v1 API.
*   The --os-share-api-version option supports overriding the version.
*   If 1.0 is specified as the version the client will load the v1
    client and use the server's v1 API.
*   The client will send a request for the server's API version and
    determine if the client's supported versions and the server's
    supported versions overlap. If not the client will display an error
    and quit. See diagram 1 below.
*   The client supports the @wraps annotation. The annotation is used
    with the v2/shell.py commands and any class that inherits from
    the Manager class in manilaclient/base.py.
*   If an appropriate command version isn't found for commands using
    @wraps then the client will display an error and quit.

following commit: ab49d645be.

Diagram 1:
  Client:
         2.5           2.8
          |-------------|

  Server1:
     2.0           2.5
      |-------------|
     Client uses version 2.5

  Server2:
               2.7           2.10
                |-------------|
               Client uses version 2.8

  Server3:
                  2.9           2.12
                   |-------------|
                  Client displays error and quits

  Server4:
     1.0 (Kilo Server)
      |-|
     Client detects pre-microversion server and loads v1 client

Example usage of wraps annotation:
*   Support 2.0 - 2.4: @api_versions.wraps("2.0", "2.4")
*   Support 2.5 - latest: @api_versions.wraps("2.5")

Implements: blueprint manila-client-advanced-microversion-support

Change-Id: I3733fe85424e39566addc070d42609e508259f19

2015-11-16 19:03:55 +00:00

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