Add diagrams to the architecture doc page

Added some data model diagrams, sequence diagrams and state machine
diagrams.
The state machine diagrams and sequence diagrams are built with
PlantUML whereas data model diagrams are built with Dia.
Also added some textual description with the sequence diagrams.

Change-Id: Iffbb47b0f2d12ce63eeaa1531a1bd1a790d69e79
Closes-Bug: #1531802

doc/source/architecture.rst

@@ -34,8 +34,8 @@ Components
 AMQP Bus
 --------
 
-The AMQP message bus handles asynchronous communications between the different
-Watcher components.
+The AMQP message bus handles internal asynchronous communications between the
+different Watcher components.
 
 .. _cluster_history_db_definition:
 
@@ -51,6 +51,14 @@ MongoDB,...) but will probably be more performant when using
 which are optimized for handling time series data, which are arrays of numbers
 indexed by time (a datetime or a datetime range).
 
+.. _cluster_model_db_definition:
+
+Cluster Model Database
+------------------------
+
+This component stores the data related to the
+:ref:`Cluster Data Model <cluster_data_model_definition>`.
+
 .. _archi_watcher_api_definition:
 
 Watcher API
@@ -159,7 +167,7 @@ The :ref:`Strategy <strategy_definition>` is then dynamically loaded (via
 `stevedore <https://github.com/openstack/stevedore/>`_). The
 :ref:`Watcher Decision Engine <watcher_decision_engine_definition>` calls the
 **execute()** method of the :ref:`Strategy <strategy_definition>` class which
-generates a set of :ref:`Actions <action_definition>`.
+generates a solution composed of a set of :ref:`Actions <action_definition>`.
 
 These :ref:`Actions <action_definition>` are scheduled in time by the
 :ref:`Watcher Planner <watcher_planner_definition>` (i.e., it generates an
@@ -179,4 +187,187 @@ Audit, the :ref:`Strategy <strategy_definition>` relies on two sets of data:
 So far, only one :ref:`Strategy <strategy_definition>` can be associated to a
 given :ref:`Goal <goal_definition>` via the main Watcher configuration file.
 
+.. _data_model:
+
+Data model
+==========
+
+The following diagram shows the data model of Watcher, especially the
+functional dependency of objects from the actors (Admin, Customer) point of
+view (Goals, Audits, Action Plans, ...):
+
+.. image:: ./images/functional_data_model.svg
+   :width: 100%
+
+.. _sequence_diagrams:
+
+Sequence diagrams
+=================
+
+The following paragraph shows the messages exchanged between the different
+components of Watcher for the most often used scenarios.
+
+.. _sequence_diagrams_create_audit_template:
+
+Create a new Audit Template
+---------------------------
+
+The :ref:`Administrator <administrator_definition>` first creates an
+:ref:`Audit template <audit_template_definition>` providing at least the
+following parameters:
+
+-   A name
+-   A goal to achieve
+
+.. image:: ./images/sequence_create_audit_template.png
+   :width: 100%
+
+The `Watcher API`_  just makes sure that the goal exists (i.e. it is declared
+in the Watcher configuration file) and stores a new audit template in the
+:ref:`Watcher Database <watcher_database_definition>`.
+
+.. _sequence_diagrams_create_and_launch_audit:
+
+Create and launch a new Audit
+-----------------------------
+
+The :ref:`Administrator <administrator_definition>` can then launch a new
+:ref:`Audit <audit_definition>` by providing at least the unique UUID of the
+previously created :ref:`Audit template <audit_template_definition>`:
+
+.. image:: ./images/sequence_create_and_launch_audit.png
+   :width: 100%
+
+A message is sent on the :ref:`AMQP bus <amqp_bus_definition>` which triggers
+the Audit in the
+:ref:`Watcher Decision Engine <watcher_decision_engine_definition>`:
+
+.. image:: ./images/sequence_trigger_audit_in_decision_engine.png
+   :width: 100%
+
+The :ref:`Watcher Decision Engine <watcher_decision_engine_definition>` reads
+the Audit parameters from the
+:ref:`Watcher Database <watcher_database_definition>`. It instantiates the
+appropriate :ref:`Strategy <strategy_definition>` (using entry points)
+associated to the :ref:`Goal <goal_definition>` of the
+:ref:`Audit <audit_definition>` (it uses the information of the Watcher
+configuration file to find the mapping between the
+:ref:`Goal <goal_definition>` and the :ref:`Strategy <strategy_definition>`
+python class).
+
+The :ref:`Watcher Decision Engine <watcher_decision_engine_definition>` also
+builds the :ref:`Cluster Data Model <cluster_data_model_definition>`. This
+data model is needed by the :ref:`Strategy <strategy_definition>` to know the
+current state and topology of the audited
+:ref:`Openstack cluster <cluster_definition>`.
+
+The :ref:`Watcher Decision Engine <watcher_decision_engine_definition>` calls
+the **execute()** method of the instantiated
+:ref:`Strategy <strategy_definition>` and provides the data model as an input
+parameter. This method computes a :ref:`Solution <strategy_definition>` to
+achieve the goal and returns it to the
+:ref:`Decision Engine <watcher_decision_engine_definition>`. At this point,
+actions are not scheduled yet.
+
+The :ref:`Watcher Decision Engine <watcher_decision_engine_definition>`
+dynamically loads the :ref:`Watcher Planner <watcher_planner_definition>`
+implementation which is configured in Watcher (via entry points) and calls the
+**schedule()** method of this class with the solution as an input parameter.
+This method finds an appropriate scheduling of
+:ref:`Actions <action_definition>` taking into account some scheduling rules
+(such as priorities between actions).
+It generates a new :ref:`Action Plan <action_plan_definition>` with status
+**RECOMMENDED** and saves it into the
+:ref:`Watcher Database <watcher_database_definition>`. The saved action plan is
+now a scheduled flow of actions.
+
+If every step executed successfully, the
+:ref:`Watcher Decision Engine <watcher_decision_engine_definition>` updates
+the current status of the Audit to **SUCCEEDED** in the
+:ref:`Watcher Database <watcher_database_definition>` and sends a notification
+on the bus to inform other components that the :ref:`Audit <audit_definition>`
+was successful.
+
+
+.. _sequence_diagrams_launch_action_plan:
+
+Launch Action Plan
+------------------
+
+The :ref:`Administrator <administrator_definition>` can then launch the
+recommended :ref:`Action Plan <action_plan_definition>`:
+
+.. image:: ./images/sequence_launch_action_plan.png
+   :width: 100%
+
+A message is sent on the :ref:`AMQP bus <amqp_bus_definition>` which triggers
+the :ref:`Action Plan <action_plan_definition>` in the
+:ref:`Watcher Applier <watcher_applier_definition>`:
+
+.. image:: ./images/sequence_launch_action_plan_in_applier.png
+   :width: 100%
+
+The :ref:`Watcher Applier <watcher_applier_definition>` will get the
+description of the flow of :ref:`Actions <action_definition>` from the
+:ref:`Watcher Database <watcher_database_definition>` and for each
+:ref:`Action <action_definition>` it will instantiate a corresponding
+:ref:`Action <action_definition>` handler python class.
+
+The :ref:`Watcher Applier <watcher_applier_definition>` will then call the
+following methods of the :ref:`Action <action_definition>` handler:
+
+-   **validate_parameters()**: this method will make sure that all the
+    provided input parameters are valid:
+
+    -   If all parameters are valid, the Watcher Applier moves on to the next
+        step.
+    -   If it is not, an error is raised and the action is not executed. A
+        notification is sent on the bus informing other components of the
+        failure.
+
+-   **preconditions()**: this method will make sure that all conditions are met
+    before executing the action (for example, it makes sure that an instance
+    still exists before trying to migrate it).
+-   **execute()**: this method is what triggers real commands on other
+    OpenStack services (such as Nova, ...) in order to change target resource
+    state. If the action is successfully executed, a notification message is
+    sent on the bus indicating that the new state of the action is
+    **SUCCEEDED**.
+
+If every action of the action flow has been executed successfully, a
+notification is sent on the bus to indicate that the whole
+:ref:`Action Plan <action_plan_definition>` has **SUCCEEDED**.
+
+
+.. _state_machine_diagrams:
+
+State Machine diagrams
+======================
+
+.. _audit_state_machine:
+
+Audit State Machine
+-------------------
+
+The following diagram shows the different possible states of an
+:ref:`Audit <audit_definition>` and what event makes the state change to a new
+value:
+
+.. image:: ./images/audit_state_machine.png
+   :width: 100%
+
+.. _action_plan_state_machine:
+
+Action Plan State Machine
+-------------------------
+
+The following diagram shows the different possible states of an
+:ref:`Action Plan <action_plan_definition>` and what event makes the state
+change to a new value:
+
+.. image:: ./images/action_plan_state_machine.png
+   :width: 100%
+
+
+
 .. _Watcher API: webapi/v1.html

doc/source/image_src/plantuml/action_plan_state_machine.txt

@@ -0,0 +1,16 @@
+@startuml
+
+[*] --> RECOMMENDED: The Watcher Planner\ncreates the Action Plan
+RECOMMENDED --> TRIGGERED: Administrator launches\nthe Action Plan
+TRIGGERED --> ONGOING: The Watcher Applier receives the request\nto launch the Action Plan
+ONGOING --> FAILED: Something failed while executing\nthe Action Plan in the Watcher Applier
+ONGOING --> SUCCEEDED: The Watcher Applier executed\nthe Action Plan successfully
+FAILED --> DELETED : Administrator removes\nAction Plan
+SUCCEEDED --> DELETED : Administrator removes\nAction Plan
+ONGOING --> CANCELLED : Administrator cancels\nAction Plan
+RECOMMENDED --> CANCELLED : Administrator cancels\nAction Plan
+TRIGGERED --> CANCELLED : Administrator cancels\nAction Plan
+CANCELLED --> DELETED
+DELETED --> [*]
+
+@enduml

doc/source/image_src/plantuml/audit_state_machine.txt

@@ -0,0 +1,14 @@
+@startuml
+
+[*] --> PENDING: Audit requested by Administrator
+PENDING --> ONGOING: Audit request is received\nby the Watcher Decision Engine
+ONGOING --> FAILED: Audit fails\n(no solution found, technical error, ...)
+ONGOING --> SUCCEEDED: The Watcher Decision Engine\ncould find at least one Solution
+FAILED --> DELETED : Administrator wants to\narchive/delete the Audit
+SUCCEEDED --> DELETED : Administrator wants to\narchive/delete the Audit
+PENDING --> CANCELLED : Administrator cancels\nthe Audit
+ONGOING --> CANCELLED : Administrator cancels\nthe Audit
+CANCELLED --> DELETED : Administrator wants to\narchive/delete the Audit
+DELETED --> [*]
+
+@enduml

doc/source/image_src/plantuml/sequence_create_and_launch_audit.txt

@@ -0,0 +1,24 @@
+@startuml
+
+
+actor Administrator
+
+Administrator -> "Watcher CLI" : watcher audit-create -a <audit_template_uuid>
+
+"Watcher CLI" -> "Watcher API" : POST audit(parameters)
+"Watcher API" -> "Watcher Database" : create new audit in database (status=PENDING)
+
+"Watcher API" <-- "Watcher Database" : new audit uuid
+"Watcher CLI" <-- "Watcher API" : return new audit URL
+
+Administrator <-- "Watcher CLI" : new audit uuid
+
+"Watcher API" -> "AMQP Bus" : trigger_audit(new_audit.uuid)
+"AMQP Bus" -> "Watcher Decision Engine" : trigger_audit(new_audit.uuid)
+
+ref over "Watcher Decision Engine"
+  Trigger audit in the
+  Watcher Decision Engine
+end ref
+
+@enduml

doc/source/image_src/plantuml/sequence_create_audit_template.txt

@@ -0,0 +1,16 @@
+@startuml
+
+actor Administrator
+
+Administrator -> "Watcher CLI" : watcher audit-template-create <name> <goal>
+"Watcher CLI" -> "Watcher API" : POST audit_template(parameters)
+
+"Watcher API" -> "Watcher API" : make sure goal exist in configuration
+"Watcher API" -> "Watcher Database" : create new audit_template in database
+
+"Watcher API" <-- "Watcher Database" : new audit template uuid
+"Watcher CLI" <-- "Watcher API" : return new audit template URL in HTTP Location Header
+Administrator <-- "Watcher CLI" : new audit template uuid
+
+@enduml
+

doc/source/image_src/plantuml/sequence_launch_action_plan.txt

@@ -0,0 +1,23 @@
+@startuml
+
+actor Administrator
+
+Administrator -> "Watcher CLI" : watcher action-plan-start <action_plan_uuid>
+
+"Watcher CLI" -> "Watcher API" : PATCH action_plan(state=TRIGGERED)
+"Watcher API" -> "Watcher Database" : action_plan.state=TRIGGERED
+
+"Watcher CLI" <-- "Watcher API" : HTTP 200
+
+Administrator <-- "Watcher CLI" : OK
+
+"Watcher API" -> "AMQP Bus" : launch_action_plan(action_plan.uuid)
+"AMQP Bus" -> "Watcher Applier" : launch_action_plan(action_plan.uuid)
+
+ref over "Watcher Applier"
+  Launch Action Plan in the
+  Watcher Applier
+end ref
+
+@enduml
+

doc/source/image_src/plantuml/sequence_launch_action_plan_in_applier.txt

@@ -0,0 +1,31 @@
+@startuml
+
+"AMQP Bus" -> "Watcher Applier" : launch_action_plan(action_plan.uuid)
+"Watcher Applier" -> "Watcher Database" : action_plan.state=ONGOING
+"Watcher Applier" -[#blue]> "AMQP Bus" : notify action plan state = ONGOING
+"Watcher Applier" -> "Watcher Database" : get_action_list(action_plan.uuid)
+"Watcher Applier" <-- "Watcher Database" : actions
+loop for each action of the action flow
+create Action
+"Watcher Applier" -> Action : instantiate Action object with target resource id\n and input parameters
+"Watcher Applier" -> Action : validate_parameters()
+"Watcher Applier" <-- Action : OK
+"Watcher Applier" -[#blue]> "AMQP Bus" : notify action state = ONGOING
+"Watcher Applier" -> Action : preconditions()
+"Watcher Applier" <-- Action : OK
+"Watcher Applier" -> Action : execute()
+alt action is "migrate instance"
+Action -> "Nova API" : migrate(instance_id, dest_host_id)
+Action <-- "Nova API" : OK
+else action is "disable hypervisor"
+Action -> "Nova API" : host-update(host_id, maintenance=true)
+Action <-- "Nova API" : OK
+end
+"Watcher Applier" <-- Action : OK
+"Watcher Applier" -> "Watcher Database" : action.state=SUCCEEDED
+"Watcher Applier" -[#blue]> "AMQP Bus" : notify action state = SUCCEEDED
+end
+"Watcher Applier" -> "Watcher Database" : action_plan.state=SUCCEEDED
+"Watcher Applier" -[#blue]> "AMQP Bus" : notify action plan state = SUCCEEDED
+
+@enduml

doc/source/image_src/plantuml/sequence_trigger_audit_in_decision_engine.txt

@@ -0,0 +1,31 @@
+@startuml
+
+"AMQP Bus" -> "Watcher Decision Engine"  : trigger_audit(new_audit.uuid)
+"Watcher Decision Engine" -> "Watcher Database" : update audit.state = ONGOING
+"AMQP Bus" <[#blue]- "Watcher Decision Engine" : notify new audit state = ONGOING
+"Watcher Decision Engine" -> "Watcher Database" : get audit parameters(goal, ...)
+"Watcher Decision Engine" <-- "Watcher Database" : audit parameters(goal, ...)
+create Strategy
+"Watcher Decision Engine" -[#red]> "Strategy": select appropriate\noptimization strategy
+loop while enough data to build cluster data model
+  "Watcher Decision Engine" -> "Nova API" : get resource state (host, instance, ...)
+  "Watcher Decision Engine" <-- "Nova API" : resource state
+end
+"Watcher Decision Engine" -[#red]> "Watcher Decision Engine": build cluster_data_model
+"Watcher Decision Engine" -> "Strategy" : execute(cluster_data_model)
+loop while enough history data for the strategy
+"Strategy" -> "Ceilometer API": get_aggregated_metrics\n(resource_id,meter_name,period,aggregate_method)
+"Strategy" <-- "Ceilometer API": aggregated metrics
+end
+"Strategy" -> "Strategy" : compute solution to achieve goal
+"Watcher Decision Engine" <-- "Strategy" : solution = array of actions (i.e. not scheduled yet)
+create "Watcher Planner"
+"Watcher Decision Engine" -[#red]> "Watcher Planner": select appropriate actions scheduler (i.e. Planner implementation)
+"Watcher Decision Engine" -> "Watcher Planner": schedule(audit_id, solution)
+"Watcher Planner" -> "Watcher Planner": schedule actions according to\nscheduling rules/policies
+"Watcher Decision Engine" <-- "Watcher Planner": new action_plan
+"Watcher Decision Engine" -> "Watcher Database" : save new action_plan in database
+"Watcher Decision Engine" -> "Watcher Database" : update audit.state = SUCCEEDED
+"AMQP Bus" <[#blue]- "Watcher Decision Engine" : notify new audit state = SUCCEEDED
+
+@enduml

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