Update Apex PDP Documentation

Updating the Apex PDP documentation to support the new architecture.

Change-Id: Ice4d91080d57504d10db24ada08757ae3d03afd3
Issue-ID: POLICY-1682
Signed-off-by: a.sreekumar <ajith.sreekumar@est.tech>

2 files changed, 412 insertions, 0 deletions

diff --git a/docs/APEX-OnapPf-Guide.rst b/docs/APEX-OnapPf-Guide.rst
new file mode 100644
index 000000000..224df8901
--- /dev/null
+++ b/docs/APEX-OnapPf-Guide.rst
@@ -0,0 +1,411 @@
+.. This work is licensed under a Creative Commons Attribution 4.0 International License.
+.. http://creativecommons.org/licenses/by/4.0
+
+
+APEX-OnapPf Guide
+*****************
+
+.. contents::
+    :depth: 3
+
+Installation
+^^^^^^^^^^^^
+
+Build and Install
+-------------------
+
+   .. container:: paragraph
+
+      Refer `Apex User Manual <https://docs.onap.org/en/casablanca/submodules/policy/apex-pdp.git/docs/APEX-User-Manual.html>`_ to find details on the build and installation of the APEX component. Information on the requirements and system configuration can also be found here.
+
+Installation Layout
+-------------------
+
+   .. container:: paragraph
+
+      A full installation of APEX comes with the following layout.
+
+   .. container:: listingblock
+
+      .. container:: content
+
+         ::
+
+            $APEX_HOME
+                ├───bin             (1)
+                ├───etc             (2)
+                │   ├───editor
+                │   ├───hazelcast
+                │   ├───infinispan
+                │   └───META-INF
+                │   ├───onappf
+                |       └───config      (3)
+                │   └───ssl             (4)
+                ├───examples            (5)
+                │   ├───config          (6)
+                │   ├───docker          (7)
+                │   ├───events          (8)
+                │   ├───html            (9)
+                │   ├───models          (10)
+                │   └───scripts         (11)
+                ├───lib             (12)
+                │   └───applications        (13)
+                └───war             (14)
+
+   .. container:: colist arabic
+
+      +-----------------------------------+-----------------------------------+
+      | **1**                             | binaries, mainly scripts (bash    |
+      |                                   | and bat) to start the APEX engine |
+      |                                   | and applications                  |
+      +-----------------------------------+-----------------------------------+
+      | **2**                             | configuration files, such as      |
+      |                                   | logback (logging) and third party |
+      |                                   | library configurations            |
+      +-----------------------------------+-----------------------------------+
+      | **3**                             | configuration files for           |
+      |                                   | APEXOnapPf, such as               |
+      |                                   | OnapPfConfig.json (initial        |
+      |                                   | configuration for APEXOnapPf) and |
+      |                                   | topic.properties (dmaap topics)   |
+      +-----------------------------------+-----------------------------------+
+      | **4**                             | ssl related files such as         |
+      |                                   | policy-keystore and               |
+      |                                   | policy-truststore                 |
+      +-----------------------------------+-----------------------------------+
+      | **5**                             | example policy models to get      |
+      |                                   | started                           |
+      +-----------------------------------+-----------------------------------+
+      | **6**                             | configurations for the examples   |
+      |                                   | (with sub directories for         |
+      |                                   | individual examples)              |
+      +-----------------------------------+-----------------------------------+
+      | **7**                             | Docker files and additional       |
+      |                                   | Docker instructions for the       |
+      |                                   | examples                          |
+      +-----------------------------------+-----------------------------------+
+      | **8**                             | example events for the examples   |
+      |                                   | (with sub directories for         |
+      |                                   | individual examples)              |
+      +-----------------------------------+-----------------------------------+
+      | **9**                             | HTML files for some examples,     |
+      |                                   | e.g. the Decisionmaker example    |
+      +-----------------------------------+-----------------------------------+
+      | **10**                            | the policy models, generated for  |
+      |                                   | each example (with sub            |
+      |                                   | directories for individual        |
+      |                                   | examples)                         |
+      +-----------------------------------+-----------------------------------+
+      | **11**                            | additional scripts for the        |
+      |                                   | examples (with sub directories    |
+      |                                   | for individual examples)          |
+      +-----------------------------------+-----------------------------------+
+      | **12**                            | the library folder with all Java  |
+      |                                   | JAR files                         |
+      +-----------------------------------+-----------------------------------+
+      | **13**                            | applications, also known as jar   |
+      |                                   | with dependencies (or fat jars),  |
+      |                                   | individually deployable           |
+      +-----------------------------------+-----------------------------------+
+      | **14**                            | WAR files for web applications    |
+      +-----------------------------------+-----------------------------------+
+
+
+Verify the APEXOnapPf Installation
+----------------------------------
+
+   .. container:: paragraph
+
+      When APEX is installed and all settings are realized, the
+      installation can be verified.
+
+Verify Installation - run APEXOnapPf
+####################################
+
+      .. container:: paragraph
+
+         A simple verification of an APEX installation can be done by
+         simply starting the APEXOnapPf without any configuration. On
+         Unix (or Cygwin) start the engine using
+         ``$APEX_HOME/bin/apexOnapPf.sh``. On Windows start the engine
+         using ``%APEX_HOME%\bin\apexOnapPf.bat``. The engine will fail
+         to fully start. However, if the output looks similar to the
+         following line, the APEX installation is realized.
+
+      .. container:: listingblock
+
+         .. container:: content
+
+            .. code::
+               :number-lines:
+
+               Apex [main] INFO o.o.p.a.s.onappf.ApexStarterMain - In ApexStarter with parameters []
+               Apex [main] ERROR o.o.p.a.s.onappf.ApexStarterMain - start of services-onappf failed
+               org.onap.policy.apex.services.onappf.exception.ApexStarterException: apex starter configuration file was not specified as an argument
+               at org.onap.policy.apex.services.onappf.ApexStarterCommandLineArguments.validateReadableFile(ApexStarterCommandLineArguments.java:278)
+                       at org.onap.policy.apex.services.onappf.ApexStarterCommandLineArguments.validate(ApexStarterCommandLineArguments.java:165)
+                       at org.onap.policy.apex.services.onappf.ApexStarterMain.<init>(ApexStarterMain.java:66)
+                       at org.onap.policy.apex.services.onappf.ApexStarterMain.main(ApexStarterMain.java:165)
+
+
+         .. container:: paragraph
+
+            To fully verify the installation, run the ApexOnapPf by providing the configuration files.
+
+         .. container:: paragraph
+
+            OnapPfConfig.json is the file which contains the initial configuration to startup the ApexStarter service. The dmaap topics to be used for sending or receiving messages is specified in the topic.properties file. Provide these two files as arguments while running the ApexOnapPf.
+
+         .. container:: listingblock
+
+            .. container:: content
+
+               .. code::
+                      :number-lines:
+
+                      # $APEX_HOME/bin/apexOnapPf.sh -c $APEX_HOME/etc/onappf/config/OnapPfConfig.json -p $APEX_HOME/etc/onappf/config/topic.properties (1)
+                      # $APEX_HOME/bin/apexOnapPf.sh -c C:/apex/apex-full-2.0.0-SNAPSHOT/etc/onappf/config/OnapPfConfig.json -p C:/apex/apex-full-2.0.0-SNAPSHOT/etc/onappf/config/topic.properties (2)
+                      >%APEX_HOME%\bin\apexOnapPf.bat -c %APEX_HOME%\etc\onappf\config\OnapPfConfig.json -p %APEX_HOME%\etc\onappf\config\topic.properties (3)
+
+         .. container:: colist arabic
+
+            +-------+---------+
+            | **1** | UNIX    |
+            +-------+---------+
+            | **2** | Cygwin  |
+            +-------+---------+
+            | **3** | Windows |
+            +-------+---------+
+
+         .. container:: paragraph
+
+            The APEXOnapPf should start successfully. Assuming the logging levels are
+            not changed (default level is ``info``), the output should look
+            similar to this (last few lines)
+
+         .. container:: listingblock
+
+            .. container:: content
+
+               .. code::
+                  :number-lines:
+
+                  In ApexStarter with parameters [-c, C:/apex/etc/onappf/config/OnapPfConfig.json, -p, C:/apex/etc/onappf/config/topic.properties] . . .
+                  Apex [main] INFO o.o.p.c.u.services.ServiceManager - service manager starting set alive
+                  Apex [main] INFO o.o.p.c.u.services.ServiceManager - service manager starting register pdp status context object
+                  Apex [main] INFO o.o.p.c.u.services.ServiceManager - service manager starting topic sinks
+                  Apex [main] INFO o.o.p.c.u.services.ServiceManager - service manager starting Pdp Status publisher
+                  Apex [main] INFO o.o.p.c.u.services.ServiceManager - service manager starting Register pdp update listener
+                  Apex [main] INFO o.o.p.c.u.services.ServiceManager - service manager starting Register pdp state change request dispatcher
+                  Apex [main] INFO o.o.p.c.u.services.ServiceManager - service manager starting Message Dispatcher . . .
+                  Apex [main] INFO o.o.p.c.u.services.ServiceManager - service manager starting Rest Server . . .
+                  Apex [main] INFO o.o.p.c.u.services.ServiceManager - service manager started
+                  Apex [main] INFO o.o.p.a.s.onappf.ApexStarterMain - Started ApexStarter service
+
+         .. container:: paragraph
+
+            The ApexOnapPf service is now running, sending heartbeat messages to dmaap (which will be received by PAP) and listening for messages from PAP on the dmaap topic specified. Based on instructions from PAP, the ApexOnapPf will deploy or undeploy policies on the ApexEngine.
+
+         .. container:: paragraph
+
+            Terminate APEX by simply using ``CTRL+C`` in the console.
+
+Running APEXOnapPf in Docker
+----------------------------
+
+      .. container:: paragraph
+
+         Running APEX from the ONAP docker repository only requires 2
+         commands:
+
+      .. container:: olist arabic
+
+         1. Log into the ONAP docker repo
+
+         .. container:: listingblock
+
+            .. container:: content
+
+               ::
+
+                  docker login -u docker -p docker nexus3.onap.org:10003
+
+
+         2. Run the APEX docker image
+
+         .. container:: listingblock
+
+            .. container:: content
+
+               ::
+
+                  docker run -p 6969:6969 -p 23324:23324 -it --rm  nexus3.onap.org:10001/onap/policy-apex-pdp:2.1-SNAPSHOT-latest /bin/bash -c "/opt/app/policy/apex-pdp/bin/apexOnapPf.sh -c /opt/app/policy/apex-pdp/etc/onappf/config/OnapPfConfig.json -p /opt/app/policy/apex-pdp/etc/onappf/config/topic.properties"
+
+      .. container:: paragraph
+
+         To run the ApexOnapPf, the startup script apexOnapPf.sh along with the required configuration files are specified. Also, the ports 6969 (healthcheck) and 23324 (deployment port for the ApexEngine) are exposed.
+
+Build a Docker Image
+####################
+
+      .. container:: paragraph
+
+         Alternatively, one can use the Dockerfile defined in the Docker
+         package to build an image.
+
+      .. container:: listingblock
+
+         .. container:: title
+
+            APEX Dockerfile
+
+         .. container:: content
+
+            .. code::
+               :number-lines:
+
+               #
+               # Docker file to build an image that runs APEX on Java 8 in alpine
+               #
+               FROM onap/policy-base-alpine:1.4.0
+
+               LABEL maintainer="Policy Team"
+
+               ARG BUILD_VERSION=${BUILD_VERSION}
+               ARG POLICY_LOGS=/var/log/onap/policy/apex-pdp
+
+               ENV BUILD_VERSION ${BUILD_VERSION}
+               ENV POLICY_HOME=/opt/app/policy
+               ENV POLICY_APEX_PDP_HOME=${POLICY_HOME}/apex-pdp
+               ENV POLICY_LOGS=${POLICY_LOGS}
+
+               RUN apk add --no-cache \
+                   vim \
+                   iproute2 \
+                   iputils
+
+               # Create apex user and group
+               RUN addgroup -S apexuser && adduser -S apexuser -G apexuser
+
+
+               # Add Apex-specific directories and set ownership as the Apex admin user
+               RUN mkdir -p ${POLICY_APEX_PDP_HOME} \
+                   && mkdir -p ${POLICY_LOGS} \
+                   && chown -R apexuser:apexuser ${POLICY_LOGS}
+
+               # Unpack the tarball
+               RUN mkdir /packages
+               COPY apex-pdp-package-full.tar.gz /packages
+               RUN tar xvfz /packages/apex-pdp-package-full.tar.gz --directory ${POLICY_APEX_PDP_HOME} \
+                   && rm /packages/apex-pdp-package-full.tar.gz
+
+               # Ensure everything has the correct permissions
+               RUN find /opt/app -type d -perm 755 \
+                   && find /opt/app -type f -perm 644 \
+                   && chmod a+x ${POLICY_APEX_PDP_HOME}/bin/*
+
+               # Copy examples to Apex user area
+               RUN cp -pr ${POLICY_APEX_PDP_HOME}/examples /home/apexuser \
+                   && chown -R apexuser:apexuser /home/apexuser/*
+
+               USER apexuser
+               ENV PATH ${POLICY_APEX_PDP_HOME}/bin:$PATH
+               WORKDIR /home/apexuser
+
+
+APEXOnapPf Configuration Files Explained
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+         .. container:: paragraph
+
+            The ApexOnapPf is initialized using two files:
+
+         .. container:: ulist
+
+            -  OnapPfConfig.json
+
+            -  topic.properties
+
+Format of the configuration file (OnapPfConfig.json) explained
+--------------------------------------------------------------
+
+         .. container:: paragraph
+
+            The configuration file is a JSON file containing the initial values for configuring the rest server for healthcheck and the pdp itself. A sample can be found below:
+
+         .. container:: listingblock
+
+            .. container:: content
+
+               .. code::
+
+                  {
+                      "name":"ApexStarterParameterGroup",
+                      "restServerParameters": {  (1)
+                          "host": "0.0.0.0",
+                          "port": 6969,
+                          "userName": "...",
+                          "password": "...",
+                          "https": true  (2)
+                      },
+                      "pdpStatusParameters":{
+                          "timeIntervalMs": 120000,  (3)
+                          "pdpType":"apex",  (4)
+                          "description":"Pdp Heartbeat",
+                          "supportedPolicyTypes":[{"name":"onap.policies.controlloop.operational.Apex","version":"1.0.0"}]  (5)
+                      }
+                  }
+
+         .. container:: colist arabic
+
+            +-----------------------------------+-----------------------------------+
+            | **1**                             | parameters for setting up the     |
+            |                                   | rest server such as host, port    |
+            |                                   | userName and password.            |
+            +-----------------------------------+-----------------------------------+
+            | **2**                             | https flag if enabled will enable |
+            |                                   | https support by the rest server. |
+            +-----------------------------------+-----------------------------------+
+            | **3**                             | time interval in which PDP-A      |
+            |                                   | has to send heartbeats to PAP.    |
+            |                                   | Specified in milliseconds.        |
+            +-----------------------------------+-----------------------------------+
+            | **4**                             | Type of the pdp.                  |
+            +-----------------------------------+-----------------------------------+
+            | **5**                             | List of policy types supported by |
+            |                                   | the PDP.                          |
+            +-----------------------------------+-----------------------------------+
+
+
+Format of the properties file (topic.properties) explained
+----------------------------------------------------------
+
+         .. container:: paragraph
+
+            The dmaap topics to be used for sending or receiving messages is specified in the topic.properties file. A sample can be found below:
+
+         .. container:: listingblock
+
+            .. container:: content
+
+               .. code::
+
+                  dmaap.source.topics=POLICY-PDP-PAP  (1)
+                  dmaap.sink.topics=POLICY-PDP-PAP  (2)
+                  dmaap.source.topics.POLICY-PDP-PAP.servers= message-router  (3)
+                  dmaap.sink.topics.POLICY-PDP-PAP.servers= message-router  (4)
+
+         .. container:: colist arabic
+
+            +-----------------------------------+-----------------------------------+
+            | **1**                             | DMaap topic name of the source    |
+            |                                   | to which PDP-A listens to for     |
+            |                                   | messages from PAP.                |
+            +-----------------------------------+-----------------------------------+
+            | **2**                             | DMaap topic name of the sink to   |
+            |                                   | which PDP sends messages to.      |
+            +-----------------------------------+-----------------------------------+
+            | **3**                             | DMaap source server.              |
+            +-----------------------------------+-----------------------------------+
+            | **4**                             | DMaap sink server.                |
+            +-----------------------------------+-----------------------------------+
diff --git a/docs/index.rst b/docs/index.rst
index b891ee9dd..23517eff2 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -12,3 +12,4 @@ APEX PDP
    APEX-Policy-Guide.rst
    APEX-Developer-Guide.rst
    APEX-Install-Guide.rst
+   APEX-OnapPf-Guide.rst