Impl. Proposal CM Event Subscription LCM: Delete

References

CPS-1616 - Getting issue details... STATUS

Impl. Proposal CM Event Subscription LCM: Create

CPS-1776 - Getting issue details... STATUS

Out-of-scope

Working with wildcards and subscription update which will be taken care by a separate epic.
Subscription create ( done as part of a different story )
Merging of the ongoing subscriptions.

Assumptions

#	Issue	Notes	Decisions
1	Delete use case works for a valid ongoing subscription only.
2	Works only for the passthrough datastores.

Issues & Decisions

#	Issue	Notes	Decisions
1	Delete the subscription from the database?	When do we actually delete the subscription from CPS DB ? We plan to do it when we receive response from the DMI plugins and the underlying subscriptions from the devices are deleted.
2	What do we need to send to the DMI Plugin so that they are able to decide that how to delete the ongoing subscription.	subscription name + client id + cmhandle ids? + cmhandle properties? + datastore?
3	The subscription delete request should be able to retry and make sure the subscriptions are deleted from the respective DMIs managing the devices.	kieran mccarthy The agenda for the next meeting. We can decide then. More on the "DELETING" stage ( if we want to have it )	kieran mccarthy As discussed on 17 Jul 2023 , The DME should be able to maintain Subscription State and make decision when to retry based on the response outcome we provide to it for create and/or delete use cases.
4	DME to NCMP Event to have targets and datastore-xpath-filter information for the subscription delete use case ?		kieran mccarthy As per the discussion today 25 Jul 2023 we agreed to use targets , datastore-xpath-filters and datastores for the subscription delete use case.

Overview

We receive an event of type : subscriptionDeleted from the client ( DME ) containing the subscription clientId and subscription name along with datastore and dataCategory details ( DMEtoNCMP )
We check in NCMP that we have an ongoing subscription using clientId and subscriptionName.
If we have ongoing subscription , we forward the event to dmi-plugins so that the changes are applied in the devices managed by dmi-plugin as well. ( Impl. Proposal CM Event Subscription LCM: Delete )
Now if the dmi-plugins have applied the request then we get an event back from dmi-plugin and NCMP will process that event and based on that it will delete the ongoing subscription request from the database itself. If the response from DMI plugins is accepted ( i.e it can delete the subscriptions from the underlying devices and no subscription delete request are in PENDING or REJECTED state )Then we delete the subscriptions from the DB as well. ( Impl. Proposal CM Event Subscription LCM: Delete )
After processing the received event from DMI , NCMP will send the final event to the client (DME). ( Impl. Proposal CM Event Subscription LCM: Delete )

Subscription Delete Sequence Diagram

DME to NCMP

Subscription Delete Event

topic subscription

id generated by client
source "SCO-9989752"
specversion  "1.0"
type subscriptionDeleted
time
dataschema org.onap.ncmp.cm.subscription:1.0.0
{
  "data": {
    "subscription": {
      "clientID": "SCO-9989752",
      "name": "cm-subscription-001"
    },
    "dataType": {
      "dataspace": "ALL",
      "dataCategory": "CM",
      "dataProvider": "CM-SERVICE"
    },       "predicates":{   “targets” : [“cmHandle1”, “cmHandle2”, “cmHandle3”]
        "datastore": “passthrough-running",
        "datastore-xpath-filter": "//_3gpp-nr-nrm-gnbdufunction:GNBDUFunction/
             _3gpp-nr-nrm-nrcelldu:NRCellDU/ | //_3gpp-nr-nrm-gnbcuupfunction:GNBCUUPFunction// |
            //_3gpp-nr-nrm-gnbcucpfunction:GNBCUCPFunction/_3gpp-nr-nrm-nrcelldu:NRCellCU// |
            //_3gpp-nr-nrm-nrsectorcarrier:NRSectorCarrier//”

}

}

"javaType": "org.onap.cps.ncmp.events.avcsubscription1_0_0.client_to_ncmp"

NCMP to DMI-Plugins

Produced by NCMP and Consumed by DMI Plugins

topic: ncmp-dmi-cm-avc-subscription-dminame1

id uuid
source "SCO-9989752"
specversion "1.0"
type subscriptionDeleted
time // ncmp will generate
dataschema org.onap.ncmp.dmi.cm.subscription:1.0.0
{
"data":{
      "subscription":{
         "clientID":"SCO-9989752",
         "name":"cm-subscription-001",
         "isTagged":false
      },
      "dataType":{
         "dataspace":"ALL",
         "dataCategory":"CM",
         "dataProvider":"CM-SERVICE"
      },
      "predicates":{
         "targets":[
            {"id" : <cmhandleid>,
             "additional-properties": ["shape":"circle"]},
            {"id" : <cmhandleid>,
             "additional-properties": ["shape":"triangle"]},
            {"id" : <cmhandleid>,
             "additional-properties": ["shape":"square"]}
         ],
         "datastore":"passthrough-running",
         "datastore-xpath-filter":"//_3gpp-nr-nrm-gnbdufunction:GNBDUFunction/_3gpp-nr-nrm-nrcelldu:NRCellDU/ | //_3gpp-nr-nrm-gnbcuupfunction:GNBCUUPFunction// | //_3gpp-nr-nrm-gnbcucpfunction:GNBCUCPFunction/_3gpp-nr-nrm-nrcelldu:NRCellCU// | //_3gpp-nr-nrm-nrsectorcarrier:NRSectorCarrier//"
      }
   }
}

"javaType": "org.onap.cps.ncmp.events.avcsubscription1_0_0.ncmp_to_dmi"

DMI-Plugins to NCMP

Produced by DMI Plugins and Consumed by NCMP

topic: dmi-ncmp-cm-avc-subscription

id uuid - generated by dmi-plugins
source <dmiName>
specversion "1.0"
type subscriptionDeletedStatus
time - generated by dmi
correlationid: clientId:subscriptionName
dataschema org.onap.ncmp.dmi.cm.subscription:1.0.0
data
{
   "clientId":"SCO-9989752",
   "subscriptionName":"cm-subscription-001",
   "dmiName":"<dmiName>",
   "subscriptionStatus":[
      {
        id : <cmhandleid>,
        status : rejected | accepted | pending,
        details : <some message> // only present for rejected
    },
      {...}
   ]
}

"javaType": "org.onap.cps.ncmp.events.avcsubscription1_0_0.dmi_to_ncmp"

Notes

dmiName in Output Schema is populated from application.yml of DMI-plugin.
DMI-plugin subscribes to the topic to consume Input Schema given in application.yml of DMI-plugin.

application.yml of DMI-Plugin

dmi:
    service:
        name: ${DMI_SERVICE_NAME:ncmp-dmi-plugin}
app:
    dmi:
        avc:
            subscription-topic: ${DMI_CM_AVC_SUBSCRIPTION:ncmp-dmi-cm-avc-subscription-${dmi.service.name}}

NCMP to DME

Produced by NCMP to send it to the Client-Apps

topic: subscription-response

id uuid - generated by NCMP
source <NCMP>
specversion "1.0"
type subscriptionDeletedStatus
time // NCMP would generate
correlationid: clientId:subscriptionName
dataschema org.onap.ncmp.cm.subscription:1.0.0
{
  "data": {
       “statusCode” : 207, # Some error code reflecting partial success. **   // To be discussed with the whole team
       “statusMessage” : “Partially Applied Subscription”,
       “additionalInfo” : {
           “rejected” : [{
                “details” : “faulty subscription format for target(s)”, // need to finalize the detailed message for grouping.
                “targets” : [“cmhandle1”, “cmhandle2”, “cmhandle3”]
           },
            {
                “details” : “faulty subscription format for target(s) - xyz”, // need to finalize the detailed message for grouping.
                “targets” : [“cmhandle1”]
           }
],
           “pending” : {
                “details” : “EMS/node connectivity issues, retrying”,
                “targets” : [“cmhandle4”, “cmhandle5”, “cmhandle6”]
       }
  }
}

// we dont have to send the accepted cmhandle details.

** 202 could indicate complete failure –
    "data": {
       “statusCode” : 406, # Some error code reflecting complete rejection of the request
       “statusMessage” : “Subscription rejected : Faulty Subscription Data”,
       “additionalInfo” : {
           “rejected” : {
                “details” : “//NRxxCellDU is not a valid subscription type”
           },

Have another for Pending CMHandles gone to accepted

"javaType": "org.onap.cps.ncmp.events.avcsubscription1_0_0.ncmp_to_client"

DB Logic for subscription delete handling

NCMP receives subscription delete response from DMI Plugins
If all DMIs have responded within 30 seconds:
1. delete subscription from db and send subscription delete accepted response to client
If some DMIs respond within 30 seconds
1. update subscription with pending for the DMIs which have not responded, for the DMIs which have responded, remove those CMHandles from the subscription db
2. send response to clients
3. wait for DMIs to respond, update db according to DMI response and respond to client
If all DMIs respond but some are rejected,
1. remove dmis which have been accepted and mark rest as rejected.
2. send response to clients