Offered APIs

Introduction

NBI stands for NorthBound Interface. It brings to ONAP a set of API that can be used by external systems as BSS for example. These API are based on TMF API.

Global NBI architecture for Dublin release

Following illustration provides a global view about NBI architecture, integration with other ONAP components and API resource/operation provided.

../../../../../_images/onap_nbi_dublin1.jpg

API Version

APIs are described with a state version with “v” following the API Name, e.g.: nbi/api/v4/productOrder. The schema associated with a REST API must have its version number aligned with that of the REST API.

The version number has major, minor and revision numbers. E.g. v1.0.0 The version number (without the revision number) is held in the URI.

The major version number is incremented for an incompatible change. The minor version number is incremented for a compatible change. For minor modifications of the API, version numbering must not be updated, provided the following backward compatibility rules are respected:

  • New elements in a data type must be optional (minOccurs=0)
  • Changes in the cardinality of an attribute in a data type must be from mandatory to optional or from lower to greater
  • New attributes defined in an element must be optional (absence of use=”required”).
  • If new enumerated values are included, the former ones and its meaning must be kept.
  • If new operations are added, the existing operations must be kept
  • New parameters added to existing operations must be optional and existing parameters must be kept

For major modifications of the API, not backward compatible and forcing client implementations to be changed, the version number must be updated.

API Table

API swagger-icon swagger-icon plantuml-icon xml-icon
  json file yaml file plant UML file xml schemas
hub link link link link
serviceCatalog link link link link
serviceInventory link link link link
serviceOrder link link link link
status link link link link

API Description

serviceCatalog

This API is based from TMF633 serviceCatalog. Only high level information is provided - Swagger is documented.

Only serviceSpecification resource is provided. Information are retrieved in SDC (and in TOSCA file) - Only GET operation is provided - this API does not update SDC.

Only characteristics at service level will be retrieved in ONAP TOSCA file. For example if an ONAP service is composed of VNF and the VF module, the serviceSpecification resource will only feature characteristic described in the ONAP service TOSCA model and not attributes in the TOSCA files for VNF or VF module.

Only basic service characteristics will be managed in this release. By basic we mean string, boolean, integer parameter type and we do not manage map or list parameter type.

GET serviceSpecification(list)

Example: GET /nbi/api/v4/serviceSpecification/ ?category=NetworkService&distributionStatus=DISTRIBUTED

It is possible to retrieve a list of serviceSpecification (get by list).

Only attributes category and distributionStatus are available for serviceSpecification filtering. It is possible to select retrieved attributes using fields attribute.

If no serviceSpecification matches, an empty list is send back.

GET service Specification (id)

Example: GET /nbi/api/v4/serviceSpecification/{uuid}

It is use to retrieve one serviceSpecification - all available information are retieved (see Swagger for description)

GET service Specification Schema (id)

Example: GET /nbi/api/v4/serviceSpecification/{uuid}/specificationInputSchema

It is use to retrieve one input schema from the tosca file stored in NBI - all available information are retieved (see Swagger for description)

serviceInventory

This API is based from TMF638 serviceInventory. Only high level information is provided - Swagger is documented.

This API retrieves service(s) in the A&AI inventory. Only following attributes will be retrieve in service inventory: id, name, state and type

GET Service Inventory (list)

Example: GET /nbi/api/v4/service/?relatedParty.id=Pontus

GET (by list) allows to request with following criteria (all optional) :

  • id (id of the service instance) - id of the service instance (inventory)
  • serviceSpecification.id - id of the service specification (catalog)
  • serviceSpecification.name - name of the service specification (catalog)
  • relatedParty.id - id of the (A&AI) customer - if not filled we use generic customer

if no service matches, an empty list is send back.

  1. If a request is send without any parameter, we’ll retrieve the list of service-instance for the generic customer
  2. If only customer parameter is filled (relatedParty.id + role= relatedParty’ONAPcustomer’) we’ll retrieve the list of service-instance for this customer
  3. If serviceSpecification.id or name is filled we’ll retrieve the list of Service instance (from this service specification) – We’ll use the customer id if provided (with Role=’ONAPcustomer) or generic if no customer id provided

GET Service Inventory (id)

Example: GET /nbi/api/v4/service/{id} When querying for a specific service instance id, no additional filters are required.

The Service Inventory API will retrieve the service instance data from A&AI using the nodes query with the service instance id as the key. relatedParty.id + serviceSpecification.name are added to the response based on the A&AI service instance url.

serviceOrder

This API is based from TMF641 serviceOrder. Only high level information is provided - Swagger is documented.

It is possible to use POST operation to create new serviceOrder in NBI and triggers service provisioning. GET operation is also available to retrieve one service order by providing id or a list of service order. For this release, only a subset of criteria is available:

  • externalId
  • state
  • description
  • orderDate.gt (orderDate must be greater – after -than)
  • orderDate.lt (orderDate must be lower-before - than)
  • fields – attribute used to filter retrieved attributes (if needed) and also for sorted SO
  • offset and limit are used for pagination purpose

ServiceOrder will manage following actionItem action:

  • add - a new service will be created
  • delete - an existing service will be deleted
  • change - an existing service will be deleted and then created with new attribute value

Prerequisites & assumptions

  • Cloud & tenant information MUST BE defined in the external API property file
  • Management of ONAP customer for add service action

With the current version of APIs used from SO and A&AI we need to manage a customer. This customer concept is confusing with Customer BSS concept. We took the following rules to manage the customer information:

  • It could be provided through a serviceOrder in the service Order a relatedParty with role ONAPcustomer should be provided in the serviceOrder header (we will not consider in this release the party at item level). External API component will check if this customer exists and create it in A&AI if not.
  • If no relatedParty is provided, the service will be affected to generic customer (dummy customer) – we assume this generic customer always exists.
  • Additionally NBI will create in A&AI the service-type if it did not exists for the customer

ServiceOrder management in NBI will support 2 modes:

  • E2E integration - NBI calls SO API to perform an End-To-end integration
  • Service-level only integration - NBI will trigger only SO request at serviceInstance level. SO prerequisite: SO must be able to find a BPMN to process service fulfillment (integrate VNF, VNF activation in SDNC, VF module

The choice of the mode is done in NBI depending on information retrieved in SDC. If the serviceSpecification is within a Category “E2E Service” , NBI will use E2E SO API, if not only API at service instance level will be used.

There is no difference or specific expectation in the service order API used by NBI user.

ServiceOrder tracking

State management: States are only managed by ServiceOrder component and could not be updated from north side via API. Accordingly to service order item fulfillment progress, order item state are updated. Order state is automatically updated based on item state. Additionnally to this state, NBI provided a completion percent progress to have detailled information about order progress. Order Message are retrieved in the GET serviceOrder to provide NBI used addtionnal information about serviceOrder management.

Notification:

It is possible for an external system to subscribe to service order notifications. 3 events are managed:

  • A new service order is created in NBI
  • A service order state changes
  • A service order item state changes

It is also possible to subscribe to AAI and SDC notifications via NBI. 4 events are managed:

  • A new service is created in AAI*
  • A service attribute value is changed in AAI
  • A service is removed in AAI
  • A service specification is distributed in SDC

These 7 events have distinct notification allowing any system to subscribe to one, two or all notification types.

The implementation will be split in 2 components:

  • A HUB resource must be managed within the NBI/serviceOrder API. This HUB resource allows system to subscribe to NBI notification
  • An Event API must be available at listener side in order to be able to receive Listener (when event occurs). NBI will be upgraded to use this API as client – NBI will shoot POST listener/

The following diagram illustrates such notification flow:

../../../../../_images/notification.jpg

East-west interaction of ONAP instances through External API

Operator’s SO component will talk to service provider’s external API component through its own external API component.

External API support two methods of posting a Service Order or registering for Hub.

  1. If the incoming request is per current implementation (no additional headers) then no changes will be made. The request will be serviced per BAU flow.
  2. If the incoming request has additional Target header parameters, External API will identify that the request has to be relayed to another ONAP instance and route the request accordingly.

Target parameter: The public endpoint url for target ONAP instance’s External API, for instance http://externalDomain/nbi/api/vX

  • For posting service order and getting service order status, the request will be relayed to target (service provider’s External API) as-is. These are synchronous requests and operator’s External API will wait for response from the target and relay it back to original calling system (operator’s SO).
  • For Hub API, there is an additional step required. The listener from calling system (operator’s SO) will be replaced with External APIs own listener. A mapping of registered subscriber and its original listener will be maintained in External API’s DB. Operator’s External API will relay the Hub API call to service provider’s External API. The service provider’s External API will register operator’s External API as a listener.
  • After SO processing in service provider’s ONAP is completed (irrespective of status – reject, success, fail etc), service provider’s External API will notify the operator’s External API about request completion. Operator’s External API will look-up for registered subscriber and its original listener (operator’s SO) and relay the message.

Operator’s Service Orchestrator will invoke its own External API component and add SP Partner URL in the header. After receiving an acknowledgement for Service Order request, the SO component will register with External API’s hub and provide its listener for processing callback events.

Technical information about East-west interaction exercise design specification and API Flow illustration (with example messages) could be found here:

https://wiki.onap.org/download/attachments/8227019/CCVPN%20Phase%202%20HLD.docx?api=v2

Developer Guide

Technical information about NBI (dependencies, configuration, running & testing) could be found here: NBI_Developer_Guide

API Flow illustration (with example messages) is described in this document: nbicallflow.pdf