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.. This work is licensed under a Creative Commons Attribution 4.0 International License.
.. http://creativecommons.org/licenses/by/4.0
.. Copyright (C) 2022 Nordix Foundation.
.. _developer_guide:
Developer Guide
===============
This document provides a quickstart for developers of the CCSDK functions for O-RAN A1 Policies.
Source tree
+++++++++++
This provides CCSDK with "A1 Policy Management Service" and "A1 Adapter" functions.
Each resource is implemented independently in a sub-directory corresponding to its name.
A1 Policy Management Service
++++++++++++++++++++++++++++
The ONAP CCSDK A1 Policy Management Service is a Java 11 web application built using the Spring Framework.
Using Spring Boot dependencies, it runs as a standalone application.
A1 Policy Management Service provides a REST API for management of policies. It provides support for:
* Supervision of clients (R-APPs) to eliminate stray policies in case of failure
* Consistency monitoring of the SMO view of policies and the actual situation in the RICs
* Consistency monitoring of RIC capabilities (policy types)
* Policy configuration. This includes:
* One REST API towards all RICs in the network
* Query functions that can find all policies in a RIC, all policies owned by a service (R-APP), all policies of a type etc.
* Maps O1 resources (ManagedElement) as defined in O1 to the controlling RIC.
The Policy Management Service can be accessed over the REST API. See :ref:`pms_api` for more information about the API.
The configured A1 policies are stored persistently to survive a service restart.
Dependencies
------------
This project uses various frameworks which are managed with Maven
dependency management tool (see *pom.xml* file at root level) :
- Swagger annotations
- `Spring Framework <https://github.com/spring-projects/spring-boot>`_
- `Springfox <https://github.com/springfox/springfox>`_ Automated JSON API documentation for APIs built with Spring
- `Lombok <https://github.com/rzwitserloot/lombok>`_ to generate code, such as getters and setters
- `Awaitility <https://github.com/awaitility/awaitility>`_ to test asynchronous functionality
- `S3 <https://mvnrepository.com/artifact/software.amazon.awssdk/s3>`_ Access of Amazon S3 - Cloud Object Storage
To get a complete list of all dependencies, use command "mvn dependency:tree".
Configuration
-------------
There are two configuration files for A1 Policy Management Service, *config/application_configuration.json* and *config/application.yaml*
The first (*config/application_configuration.json*) contains configuration needed by the application, such as which near-RT-RICs, or controller to use.
The second (*config/application.yaml*) contains logging and security configurations.
For more information about these configuration files can be found as comments in the sample files provided with the source code, or on the `ONAP wiki <https://wiki.onap.org/display/DW/O-RAN+A1+Policies+in+ONAP+Kohn>`_
Static configuration - Settings that cannot be changed at runtime (*application.yaml*)
--------------------------------------------------------------------------------------
The file *./config/application.yaml* is read by the application at startup. It provides the following configurable features:
* server; configuration for the WEB server
* used port for HTTP/HTTPS, this is however not the port numbers visible outside the container
* SSL parameters for setting up using of key store and trust store databases.
* webclient; configuration parameters for a web client used by the component
* SSL parameters for setting up using of key store and trust store databases.
* Usage of HTTP(S) Proxy; if configured, the proxy will be used for southbound access to the NearRT-RICs
* logging; setting for which information is logged.
* auth-token; optional authorization token to use for REST call.
* filepath; the local path to a file used for dynamic configuration (if used). See next chapter.
* persistent storage of runtime information. Configuration of A1 policyinstances is stored persistently. The media for this can be either filesystem (a persistent volume) or Amazon S3 - Cloud Object Storage.
For details about the parameters in this file, see documentation in the file.
Dynamic configuration - Settings that can be changed at runtime (*application_configuration.json* or REST or ConfigMap)
-----------------------------------------------------------------------------------------------------------------------
The component has configuration that can be updated in runtime. This configuration can either be loaded from a file (accessible from the container), or using the Configuration REST API. The configuration is re-read and refreshed at regular intervals.
The configuration includes:
* Optional Controller configuration, e.g. an SDNC instance (with A1-Adapter)
* (If no 'Contoller' is configured, the A1 Policy Management Service will connect direct to near-RT-RICs, bypassing the SDNC controller)
* One entry for each near-RT-RIC, which includes:
* The base URL of the near-RT-RIC
* A optional list of O1 identifiers that near-RT-RIC is controlling. An application can query this service which near-RT-RIC should be addressed for which component (e.g. cells, sectors, locations, etc.) .
* An optional reference to the controller to use, or excluded if the near-RT-RIC should be accessed directly from the A1 Policy Management Service.
For details about the syntax of the file, there is an example in source code repository */config/application_configuration.json*. This file is also included in the docker container */opt/app/policy-agent/data/application_configuration.json_example*.
Configuring certificates
------------------------
The A1 Policy Management Service uses the default keystore and truststore that are built into the container. The paths and
passwords for these stores are located in a yaml file, with an example is provided in the source code repository *a1-policy-management/config/application.yaml*
There is also the A1 Policy Management Service's own cert in the default truststore for mocking purposes and unit-testing
(*ApplicationTest.java*).
The default keystore, truststore, and application.yaml files can be overridden by mounting new files using the the docker "volumes"
command for docker-compose or docker run command. Assuming that the keystore, truststore, and application.yaml files are located in the same directory as docker-compose,
the volumes field should have these entries: ::
`volumes:`
`- ./new_keystore.jks:/opt/app/policy-agent/etc/cert/keystore.jks:ro`
`- ./new_truststore.jks:/opt/app/policy-agent/etc/cert/truststore.jks:ro`
`- ./new_application.yaml:/opt/app/policy-agent/config/application.yaml:ro`
The target paths in the container should not be modified.
Example docker run command for mounting new files (assuming they are located in the current directory): ::
docker run -p 8081:8081 -p 8433:8433 --name=policy-agent-container --network=nonrtric-docker-net --volume "$PWD/new_keystore.jks:/opt/app/policy-agent/etc/cert/keystore.jks" --volume "$PWD/new_truststore.jks:/opt/app/policy-agent/etc/cert/truststore.jks" --volume "$PWD/new_application.yaml:/opt/app/policy-agent/config/application.yaml" onap/ccsdk-oran-a1policymanagementservice:1.4.2-SNAPSHOT
A1 Adapter (Internal)
+++++++++++++++++++++
The O-RAN A1 Adapter provides an **internal** RESTCONF API that is used by the A1 Policy Management System when accessing the A1 Interface. This API is useful for test and verification but should not used otherwise.
See :ref:`a1_adapter_api` for details of this internal API.
Configuration of HTTP Proxy
---------------------------
In order to configure a HTTP Proxy for southbound connections:
* Modify file: *odlsli/src/main/properties/a1-adapter-api-dg.properties*. This file is found in CCSDK/distribution for SDNC.
* In a running container this file is found at */opt/onap/ccsdk/data/properties/a1-adapter-api-dg.properties*
* Variable a1Mediator.proxy.url must contain the full Proxy URL
After this configuration has been changed the A1 adapter needs to be either rebuilt, or restarted if the configuration is changed inside a container, or re-read by the container if externally accessible (e.g. K8s ConfigMap).
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