R9 TBDMT Enhancements

TBDMT = Template-Based Data Model Transformer, it is currently part of CPS.

References

1. CPS-TBDMT Service (Honolulu work)
2. CPS APIs (for SON and E2E Network Slicing use cases)
3. Presentation given to ArchCom: cps_tbdmt_20210323_v1.0.pptx

Design & Implementation

This service shall be used to map the erstwhile Config-DB-like REST APIs to appropriate CPS API calls. The purpose of this service is to abstract the details of (possibly multiple, and complex) XPath queries from the users of CPS. It enables CPS-users to continue using simple REST API calls that are intuitive and easy-to-understand and implement. The mapping to appropriate queries to CPS (including mapping of one API call to many Xpath queries) shall be done in a generic way by the CPS-TBDMT service.

1. Architecture

2. API definition guide

Swagger file: CPS-TBDMT-swagger.yaml

Template CRUD operations

Create xpath template

Request Body

Response Codes

List all xpath templates

Response Codes

Response Body

Template Object

Execute template

Request Body

Response Codes

Response Body

3. Definition of templates

Sample xpath query

/NearRTRIC[idNearRTRIC=11]/GNBDUFunction[idGNBDUFunction=1]/NRCellDU[idNRCellDU=15296]/attributes/RRMPolicyRatio[id=123]

Sample xpath template

/NearRTRIC[idNearRTRIC='\''{{nearrtric_id}}'\'']/GNBDUFunction[idGNBDUFunction='\''{{gnbdu_id}}'\'']/NRCellDU[idNRCellDU='\''{{nrcelldu_id}}'\'']/attributes/RRMPolicyRatio[id='\''{{rrmpolicy_id}}'\'']

Sample API for the above template

Response Object

4. Output Transformation Template Example

curl --location --request POST 'http://localhost:8080/templates' --header 'Content-Type: application/json' --data-raw '{
"templateId": "get-ric",
"model": "ns-schemaset",
"requestType": "get",
"xpathTemplate": "/",
"includeDescendants": true,
"transformParam":"NearRTRIC,GNBDUFunction,NRCellDU,idNRCellDU"
}'

5. Multiple query Example

Example test-tree model:

{"branch":[{"name":"Right","nest":{"name":"Big","birds":["Owl","Raven","Crow"]}},{"name":"Left","nest":{"name":"Small","birds":["Robin","Sparrow","Finch"]}}]}

Get-all-data
curl --location --request POST 'http://localhost:8080/templates' --header 'Content-Type: application/json' --data-raw '{
"templateId": "get-all-data",
"model": "CSIT-SchemaSet",
"requestType": "get",
"xpathTemplate": "/test-tree",
"includeDescendants": true,
"transformParam":"branch,name"
}' -i

curl --location --request POST 'http://localhost:8080/execute/CSIT-SchemaSet/get-all-data' --header 'Content-Type: application/json' --data-raw '{
"inputParameters": {
}
}' -i

Response: 

["Left","Right"]

The above response will be inserted ({{name}}) in the below template and will be executed twice(First "/test-tree/branch[@name='Left']/nest"  and then "/test-tree/branch[@name='Right']/nest") to give collective output.

Get-branch
curl --location --request POST 'http://localhost:8080/templates' --header 'Content-Type: application/json' --data-raw '{
"templateId": "get-branch",
"model": "CSIT-SchemaSet",
"requestType": "get",
"xpathTemplate": "/test-tree/branch[@name='\''{{name}}'\'']/nest",
"includeDescendants": true,
"multipleQueryTemplateId":"get-all-data",
"transformParam":"birds"
}' -i

6. Supported requestTypes:

1. get (/anchors/{anchor}/node?xpath=)
2. query (/anchors/{anchor}/nodes/query?xpath)
3. query-cps-path (/anchors/{anchor}/nodes/query?cps-path)
4. post (/anchors/{anchor}/nodes?xpath=)
5. put (/anchors/{anchor}/nodes?xpath=)
6. patch (/anchors/{anchor}/nodes?xpath=)
7. post-list-node (/anchors/{anchor}/list-node?xpath=)
8. delete(/anchors/{anchor}/nodes?xpath=)
9. delete-list-node(/anchors/{anchor}/list-nodes/?xpath=)

7. Deployment aspects

1. git clone "https://gerrit.onap.org/r/cps/cps-tbdmt" 
2. cd cps-tbdmt/
3. mvn clean install
4. cd docker-compose/
5. update cps & ncmp ip-address in application.yml
6. docker-compose up (use the image built using the above steps in the docker-compose file)