Create Drools PDP documentation - features

Create Drools PDP documentation in parent - features

Change-Id: Ie710842a7921fd46ffdef4628d50637093111cc8
Issue-ID: POLICY-1678
Signed-off-by: Saryu Shah <ss3917@att.com>

1 files changed, 117 insertions, 0 deletions

diff --git a/docs/drools/feature_healthcheck.rst b/docs/drools/feature_healthcheck.rst
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+
+.. This work is licensed under a Creative Commons Attribution 4.0 International License.
+.. http://creativecommons.org/licenses/by/4.0
+
+*************************
+Feature: Healthcheck
+*************************
+
+.. contents::
+    :depth: 3
+
+Summary
+^^^^^^^
+The Healthcheck feature provides reports used to verify the health of *PolicyEngine.manager* in addition to the construction, operation, and deconstruction of HTTP server/client objects.
+
+Usage
+^^^^^
+
+When enabled, the feature takes as input a properties file named "*feature-healtcheck.properties*" (example below). This file should contain configuration properties necessary for the construction of HTTP client and server objects.
+
+Upon initialization, the feature first constructs HTTP server and client objects using the properties from its properties file. A healthCheck operation is then triggered. The logic of the healthCheck verifies that *PolicyEngine.manager* is alive, and iteratively tests each HTTP server object by sending HTTP GET requests using its respective client object. If a server returns a "200 OK" message, it is marked as "healthy" in its individual report. Any other return code results in an "unhealthy" report.
+
+After the testing of the server objects has completed, the feature returns a single consolidated report.
+
+
+    .. code-block:: bash
+       :caption: feature-healthcheck.properties
+       :linenos:
+
+        ###
+        # ============LICENSE_START=======================================================
+        # feature-healthcheck
+        # ================================================================================
+        # Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
+        # ================================================================================
+        # Licensed under the Apache License, Version 2.0 (the "License");
+        # you may not use this file except in compliance with the License.
+        # You may obtain a copy of the License at
+        #
+        #      http://www.apache.org/licenses/LICENSE-2.0
+        #
+        # Unless required by applicable law or agreed to in writing, software
+        # distributed under the License is distributed on an "AS IS" BASIS,
+        # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+        # See the License for the specific language governing permissions and
+        # limitations under the License.
+        # ============LICENSE_END=========================================================
+        ###
+        
+        http.server.services=HEALTHCHECK
+        http.server.services.HEALTHCHECK.host=0.0.0.0
+        http.server.services.HEALTHCHECK.port=6969
+        http.server.services.HEALTHCHECK.restClasses=org.onap.policy.drools.healthcheck.RestHealthCheck
+        http.server.services.HEALTHCHECK.managed=false
+        http.server.services.HEALTHCHECK.swagger=true
+        http.server.services.HEALTHCHECK.userName=healthcheck
+        http.server.services.HEALTHCHECK.password=zb!XztG34
+        
+        http.client.services=PAP,PDP
+        
+        http.client.services.PAP.host=pap
+        http.client.services.PAP.port=9091
+        http.client.services.PAP.contextUriPath=pap/test
+        http.client.services.PAP.https=false
+        http.client.services.PAP.userName=testpap
+        http.client.services.PAP.password=alpha123
+        http.client.services.PAP.managed=true
+         
+        http.client.services.PDP.host=pdp
+        http.client.services.PDP.port=8081
+        http.client.services.PDP.contextUriPath=pdp/test
+        http.client.services.PDP.https=false
+        http.client.services.PDP.userName=testpdp
+        http.client.services.PDP.password=alpha123
+        http.client.services.PDP.managed=false
+
+
+To utilize the healthcheck functionality, first stop policy engine and then enable the feature using the "*features*" command.
+
+    .. code-block:: bash
+       :caption: Enabling Healthcheck feature
+
+        policy@hyperion-4:/opt/app/policy$ policy stop
+        [drools-pdp-controllers]
+         L []: Stopping Policy Management... Policy Management (pid=354) is stopping... Policy Management has stopped.
+        policy@hyperion-4:/opt/app/policy$ features enable healthcheck
+        name                      version         status
+        ----                      -------         ------
+        controlloop-utils         1.1.0-SNAPSHOT  disabled
+        healthcheck               1.1.0-SNAPSHOT  enabled
+        test-transaction          1.1.0-SNAPSHOT  disabled
+        eelf                      1.1.0-SNAPSHOT  disabled
+        state-management          1.1.0-SNAPSHOT  disabled
+        active-standby-management 1.1.0-SNAPSHOT  disabled
+        session-persistence       1.1.0-SNAPSHOT  disabled
+
+
+The output of the enable command will indicate whether or not the feature was enabled successfully.
+
+Policy engine can then be started as usual.
+
+The Healthcheck can also be invoked manually as follows:
+
+    .. code-block:: bash
+       :caption: Manual Healthcheck invokation
+
+
+        # Assuming the healthcheck service credentials have not been changed
+        # post-installation within the drools container
+
+        source /opt/app/policy/config/feature-healthcheck.conf.environment
+        curl -k --silent --user "${HEALTHCHECK_USER}:${HEALTHCHECK_PASSWORD}" -X GET https://localhost:6969/healthcheck | python -m json.tool
+
+
+End of Document
+
+.. SSNote: Wiki page ref. https://wiki.onap.org/display/DW/Feature+Healthcheck