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+..
+ This work is licensed under a Creative Commons Attribution 3.0 Unported
+ License.
+
+ http://creativecommons.org/licenses/by/3.0/legalcode
+
+=========================================
+Create a client module for fuel-devops3.0
+=========================================
+
+https://blueprints.launchpad.net/fuel/+spec/fuel-devops-client-as-a-module
+
+Fuel-devops should have an API class to provide a complete interface for
+interacting with the environment.
+
+
+--------------------
+Problem description
+--------------------
+
+In current implementation there is a list of functions to interact
+with environments:
+
+    * devops/helpers/helpers.py:
+        * get_nodes
+        * get_slave_ip
+        * get_admin_ip
+        * get_node_remote
+        * get_admin_remote
+        * get_private_keys
+    * devops/helpers/ntp.py:
+        * sync_time
+
+These main functions are written in procedural style. It makes it hard to
+extend or add a new one.
+
+Also some of these functions are duplicated in fuel-qa
+fuelweb_test/models/environment.py
+
+----------------
+Proposed changes
+----------------
+
+To reduce dependency issues and allow to re-use management layer of
+virtual/baremetal labs:
+
+- separate all the code that manage environments nodes/networks
+  into a 'devops' module
+- separate all the code that provide a logical layer (ssh manager,
+  filters for specific node roles, accessing to the services
+  that are started on the environment nodes) into a fuel-devops client module.
+
+Fuel-devops client module should provide a complete interface for interacting
+with the environment: manage nodes, mapping devops and nailgun nodes into a
+single object, accessing nodes via SSH, snapshot/revert nodes, bootstrap admin
+node and so on.
+It should encapsulate some of methods from fuel-devops Environment object and
+fuel-qa EnvironmentModel object (then deprecate it later).
+
+
+Schema of DevopsClient usage::
+
+    +---------+                 +----------+
+    |         |                 |          |
+    | fuel-qa |                 | shell.py |
+    |         |                 |          |
+    +-----+---+                 +-----+----+
+          |                           |
+          +--------+     +------------+
+                   |     |
+                   v     v
+              +--------------+
+              |              |
+              | DevopsClient |
+              |              |
+              +----+-----+---+
+                   |     |
+                   |     +----------+------------------+
+                   |                |                  |
+                   v                v                  v
+    +--------------------+    +---------------+   +----------+
+    |                    |    |               |   |          |
+    | devops.Environment |    | NailgunClient |   | NtpGroup |
+    |                    |    |               |   |          |
+    +--------------------+    +---------------+   +----------+
+
+
+NailgunClient should be added to replace get_nodes method.
+NtpGroup should be added to replace sync_time method.
+
+
+
+Web UI
+======
+
+None
+
+Nailgun
+=======
+
+None
+
+Data model
+----------
+
+None
+
+REST API
+--------
+
+No FUEL REST API changes.
+
+Orchestration
+=============
+
+None
+
+RPC Protocol
+------------
+
+None
+
+Fuel Client
+===========
+
+None
+
+Plugins
+=======
+
+None
+
+Fuel Library
+============
+
+None
+
+------------
+Alternatives
+------------
+
+N/A
+
+
+--------------
+Upgrade impact
+--------------
+
+N/A
+
+
+---------------
+Security impact
+---------------
+
+N/A
+
+
+--------------------
+Notifications impact
+--------------------
+
+N/A
+
+
+---------------
+End user impact
+---------------
+
+N/A
+
+
+------------------
+Performance impact
+------------------
+
+N/A
+
+
+-----------------
+Deployment impact
+-----------------
+
+N/A
+
+
+----------------
+Developer impact
+----------------
+
+N/A
+
+
+---------------------
+Infrastructure impact
+---------------------
+
+N/A
+
+
+--------------------
+Documentation impact
+--------------------
+
+* fuel-qa
+
+* fuel-devops
+
+
+--------------
+Implementation
+--------------
+
+Assignee(s)
+===========
+
+Primary assignee:
+  * Anton Studenov (astudenov): astudenov@mirantis.com
+
+Other contributors:
+  * Dennis Dmitriev (ddmitriev): ddmitriev@mirantis.com
+
+Mandatory design review:
+  Anastasiia Urlapova, Denys Dmytriiev
+
+
+Work Items
+==========
+
+* Implement DevopsClient and move get_admin_ip/get_node_remote/etc
+  to this class
+* Change Shell to use DevopsClient instead of direct access to
+  Environment
+* Refactor ntp.py to be independent of get_admin/get_slave_remote functions
+* Deprecate get_admin_ip/get_node_remote/etc functions
+
+
+Dependencies
+============
+
+None
+
+
+------------
+Testing, QA
+------------
+
+None
+
+Acceptance criteria
+===================
+
+DevopsClient provides all necessary methods to interact with devops
+environment.
+
+
+----------
+References
+----------
+
+None