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| -rw-r--r-- | docs/api/api.rst | 85 |
1 files changed, 63 insertions, 22 deletions
diff --git a/docs/api/api.rst b/docs/api/api.rst index 222a2bce..3ba8c43e 100644 --- a/docs/api/api.rst +++ b/docs/api/api.rst @@ -10,27 +10,64 @@ Policy Life Cycle API .. contents:: :depth: 2 -The purpose of this API is to support CRUD of TOSCA *PolicyType* entities. This API is provided by the +The purpose of this API is to support CRUD of TOSCA *PolicyType* and *Policy* entities. This API is provided by the *PolicyDevelopment* component of the Policy Framework, see the :ref:`The ONAP Policy Framework Architecture -<architecture-label>` page. Policy design API backend is running in an independent building block component of policy framework -that provides REST service for aforementioned CRUD behaviors. Policy design API component interacts with a policy database -for storing and fetching new policies or policy types as needed. Apart from CRUD, API is also exposed for clients to retrieve -healthcheck status of this API REST service and statistics report including a variety of counters that reflect the history -of API invocation. +<architecture-label>` page. The Policy design API backend is running in an independent building block component of the +policy framework that provides REST services for the aforementioned CRUD behaviors. The Policy design API component interacts +with a policy database for storing and fetching new policies or policy types as needed. Apart from CRUD, an API is also +exposed for clients to retrieve healthcheck status of the API REST service and statistics report including a variety of +counters that reflect the history of API invocation. We strictly follow `TOSCA Specification <http://docs.oasis-open.org/tosca/TOSCA-Simple-Profile-YAML/v1.1/TOSCA-Simple-Profile-YAML-v1.1.pdf>`_ -to define policy type and policy. A policy type is equivalent to the policy model mentioned by clients before Dublin release. -Both policy type and policy are included in a TOSCA Service Template which is used as the entity passed into API POST call -and the entity returned by API GET and DELETE calls. More details are presented in following sessions. -We encourage clients to compose all kinds of policies and corresponding policy types in well-formed TOSCA Service Template. -One Service Template can contain one or more policies and policy types. Each policy type can have multiple policies created -atop. In other words, different policies can match the same or different policy types. Existence of a policy type is a prerequisite -of creating such type of policies. In the payload body of each policy to create, policy type name and version should be indicated and -the specified policy type should be valid and existing in policy database. +to define policy types and policies. A policy type defines the schema for a policy, expressing the properties, targets, and triggers +that a policy may have. The type (string, int etc) and constraints (such as the range of legal values) of each property is defined +in the Policy Type. Both Policy Type and policy are included in a TOSCA Service Template, which is used as the entity passed into an API +POST call and the entity returned by API GET and DELETE calls. More details are presented in following sections. Policy Types and Policies +can be composed for any given domain of application. All Policy Types and Policies must be composed as well-formed TOSCA Service Templates. +One Service Template can contain multiple policies and policy types. + +Child policy types can inherit from parent policy types, so a hierarchy of policy types can be built up. For example, the HpaPolicy Policy +Type in the table below is a child of a Resource Policy Type, which is a child of an Optimization policy. +See also `the examples in Github <hhttps://github.com/onap/policy-models/tree/master/models-examples/src/main/resources/policytypes>`_. + +:: + + onap.policies.Optimization.yaml + onap.policies.optimization.Resource.yaml + onap.policies.optimization.resource.AffinityPolicy.yaml + onap.policies.optimization.resource.DistancePolicy.yaml + onap.policies.optimization.resource.HpaPolicy.yaml + onap.policies.optimization.resource.OptimizationPolicy.yaml + onap.policies.optimization.resource.PciPolicy.yaml + onap.policies.optimization.resource.Vim_fit.yaml + onap.policies.optimization.resource.VnfPolicy.yaml + onap.policies.optimization.Service.yaml + onap.policies.optimization.service.QueryPolicy.yaml + onap.policies.optimization.service.SubscriberPolicy.yaml + +Custom data types can be defined in TOSCA for properties specified in Policy Types. Data types can also inherit from parents, so a hierarchy of data types can also be built up. + +.. warning:: + When creating a Policy Type, the ancestors of the Policy Type and all its custom Data Type definitions and ancestors MUST either already + exist in the database or MUST also be defined in the incoming TOSCA Service Template. Requests with missing or bad references are rejected + by the API. + +Each Policy Type can have multiple Policy instances created from it. Therefore, many Policy instances of the HpaPolicy Policy Type above can be created. When a policy is created, its Policy Type is specified in the *type* and *type_version* fields of the policy. + +.. warning:: + The Policy Type specified for a Policy MUST exist in the database before the policy can be created. Requests with missing or bad + Policy Type references are rejected by the API. The API allows applications to create, update, delete, and query *PolicyType* entities so that they become available for -use in ONAP by applications such as CLAMP. Some Policy Type entities are preloaded in the Policy Framework. The TOSCA -fields below are valid on API calls: +use in ONAP by applications such as CLAMP. Some Policy Type entities are preloaded in the Policy Framework. + +.. warning:: + If a TOSCA entity (Data Type, Policy Type, or Policy with a certain version) already exists in the database and an attempt is made + to re-create the entity with different fields, the API will reject the request with the error message "entity in incoming fragment + does not equal existing entity". In such cases, delete the Policy or Policy Type and re-create it using the API. + + +The TOSCA fields below are valid on API calls: ============ ======= ======== ========== =============================================================================== **Field** **GET** **POST** **DELETE** **Comment** @@ -38,12 +75,16 @@ fields below are valid on API calls: (name) M M M The definition of the reference to the Policy Type, GET allows ranges to be specified version O M C GET allows ranges to be specified, must be specified if more than one version - of the Policy Type exists + of the Policy Type exists and a specific version is required description R O N/A Desciption of the Policy Type derived_from R C N/A Must be specified when a Policy Type is derived from another Policy Type such - as in the case of derived Monitoring Policy Types + as in the case of derived Monitoring Policy Types. The referenced Policy Type + must either already exist in the database or be defined as another policy type + in the incoming TOSCA service template metadata R O N/A Metadata for the Policy Type -properties R M N/A This field holds the specification of the specific Policy Type in ONAP +properties R M N/A This field holds the specification of the specific Policy Type in ONAP. Any user + defined data types specified on properties must either already exist in the + database or be defined in the incoming TOSCA service template targets R O N/A A list of node types and/or group types to which the Policy Type can be applied triggers R O N/A Specification of policy triggers, not currently supported in ONAP ============ ======= ======== ========== =============================================================================== @@ -57,7 +98,7 @@ triggers R O N/A Specification of policy triggers, not c implementations is disabled. .. note:: - Policy types that are in use (referenced by defined Policies) may not be deleted. + Policy types that are in use (referenced by defined Policies and/or child policy types) may not be deleted. .. note:: The group types of targets in TOSCA are groups of TOSCA nodes, not PDP groups; the *target* concept in TOSCA is @@ -150,7 +191,7 @@ Also, the new APIs support both *http* and *https*. For every API call, client is encouraged to insert an uuid-type requestID as parameter. It is helpful for tracking each http transaction and facilitates debugging. Mostly importantly, it complies with Logging requirements v1.2. -If client does not provider the requestID in API call, one will be randomly generated +If a client does not provide the requestID in API call, one will be randomly generated and attached to response header *x-onap-requestid*. In accordance with `ONAP API Common Versioning Strategy Guidelines <https://wiki.onap.org/display/DW/ONAP+API+Common+Versioning+Strategy+%28CVS%29+Guidelines>`_, @@ -223,7 +264,7 @@ they will need to delete them one by one. Sample API Curl Commands ------------------------- -From API client perspective, using *http* or *https* does not have much difference in curl command. +From an API client perspective, using *http* or *https* does not make much difference to the curl command. Here we list some sample curl commands (using *http*) for POST, GET and DELETE monitoring and operational policies that are used in vFirewall use case. JSON payload for POST calls can be downloaded from policy table above. |