Use cloud access URL to generate CPID.

This spec proposes RefStack to add a method to use the cloud access URL
as the base to generate the CPID.

Change-Id: I118a77f4cb328908a528376a038a43684427dbfa

specs/mitaka/approved/use-url-as-cpid.rst

@@ -0,0 +1,149 @@
+=============================================
+Use Cloud URL as the Cloud Provider ID (CPID)
+=============================================
+
+Launchpad blueprint:
+
+This spec proposes RefStack to add a method to use the cloud
+access URL as the base to generate the CPID.
+
+
+Problem description
+===================
+
+As defined in the "Test Submission API should use Target Identity
+Endpoint UUID" specification (refstack-org-api-cloud-uuid.rst).  Currently,
+RefStack uses the cloud's Identity (Keystone) UUID as the CPID.
+
+For Keystone V2 API, this ID can be the ID of any one of the
+three access endpoints, namely admin, public or private endpoints. However,
+for Keystone V3 API, this ID is the ID of the Keystone service. Furthermore,
+when testing a distro product, the Identity ID will be different every time
+a cloud is stood up, regardless that whether this cloud is built by the
+same person, with exactly the same OpenStack code and configuration. In such
+circumstances, multiple CPIDs could represent a single cloud.
+
+We have also encountered some cases that the cloud's Keystone does not even
+returns the identity service ID in the tokens it returns. In addition, there
+is recent request for RefStack to support uploading test results that were
+not collected using refstack-client.  These type of data in subunit format
+won't have CPID created at testing time.  RefStack should provide a method
+to generate CPID without the need of re-connecting to the cloud again.
+
+
+Proposed change
+===============
+
+In addition to the current practice of using the different types of Identity
+ID for CPID, RefStack should add additional support to generate the
+CPID based on the cloud URL. This will also be used as the failover method
+for CPID.
+
+
+Alternatives
+------------
+
+For consistency, RefStack should consider to only use the cloud access URL
+to generate the UUID for CPID. In consequence, RefStack no longer has to keep
+track and adjust to changes in Keystone client and API for retrieving the
+the CPID.
+
+Open to other suggestions.
+
+
+Data model impact
+-----------------
+
+None.
+
+There is no data modal change needed.
+
+
+REST API impact
+---------------
+
+None
+
+
+Security impact
+---------------
+
+None
+
+Notifications impact
+--------------------
+
+None
+
+Other end user impact
+---------------------
+
+With this failover addition, refstack-client should never again fail due to
+CPID retrieval error. This also allows RefStack to provide users with an
+option to upload data in subunit format.
+
+
+Performance Impact
+------------------
+
+None
+
+Other deployer impact
+---------------------
+
+There is possibility of CPIDs being the same for two different clouds.
+This can happen primarily in the private address space, where people may
+have use the same IP address such as 192.168.*.* (or whatever commonly used
+default addresses) for keystone address. Since this likely won't be the case
+with actual production clouds and it is a last resort, we are okay with this
+possibility.
+
+Furthermore, RefStack is no longer completely dependent on whether or not
+the cloud's Keystone even returns the Identity service ID in the tokens it
+returns.
+
+Developer impact
+----------------
+
+None
+
+Implementation
+==============
+
+Assignee(s)
+-----------
+
+Primary assignee:
+  TBD
+
+Other contributors:
+  TBD
+
+Work Items
+----------
+
+* Develop code to generate CPID based on access URL
+
+
+Dependencies
+============
+
+None
+
+
+Testing
+=======
+
+None
+
+
+Documentation Impact
+====================
+
+None
+
+
+References
+==========
+
+None