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cloud-event-proxy

The cloud-event-proxy project provides a mechanism for events from the K8s infrastructure to be delivered to CNFs with low-latency.
The initial event functionality focuses on the operation of the PTP synchronization protocol, but the mechanism can be extended for any infrastructure event that requires low-latency.
The mechanism is an integral part of k8s/OCP RAN deployments where the PTP protocol is used to provide timing synchronization for the RAN software elements

go-doc Go Report Card LICENSE

Contents

Creating Publisher

Publisher JSON Example

Create Publisher Resource: JSON request

{
  "Resource": "/east-edge-10/vdu3/o-ran-sync/sync-group/sync-status/sync-state",
  "UriLocation": "http://localhost:8080/ack/event"
}

Create Publisher Resource: JSON response

{
  "Id": "789be75d-7ac3-472e-bbbc-6d62878aad4a",
  "Resource": "/east-edge-10/vdu3/o-ran-sync/sync-group/sync-status/sync-state",
  "UriLocation": "http://localhost:9090/ack/event" ,
  "EndpointUri ": "http://localhost:8080/api/ocloudNotifications/v1/publishers/{publisherid}"
}

Creating publisher golang example

package main
import (
	v1pubsub "github.com/redhat-cne/sdk-go/v1/pubsub"
    v1amqp "github.com/redhat-cne/sdk-go/v1/amqp"
	"github.com/redhat-cne/sdk-go/pkg/types"
)
func main(){
  //channel for the transport handler subscribed to get and set events  
    eventInCh := make(chan *channel.DataChan, 10)
    pubSubInstance = v1pubsub.GetAPIInstance(".")
    endpointURL := &types.URI{URL: url.URL{Scheme: "http", Host: "localhost:8080", Path: fmt.Sprintf("%s%s", apiPath, "dummy")}}
    // create publisher 
    pub, err := pubSubInstance.CreatePublisher(v1pubsub.NewPubSub(endpointURL, "test/test"))
    // once the publisher response is received, create a transport sender object to send events.
    if err==nil{
        v1amqp.CreateSender(eventInCh, pub.GetResource())
    }
}

Creating Subscriptions

Subscription JSON Example

Create Subscription Resource: JSON request

{
  "Resource": "/east-edge-10/vdu3/o-ran-sync/sync-group/sync-status/sync-state",
  "UriLocation”: “http://localhost:9090/event"
}

Example Create Subscription Resource: JSON response

{
  "Id": "789be75d-7ac3-472e-bbbc-6d62878aad4a",
  "Resource": "/east-edge-10/vdu3/o-ran-sync/sync-group/sync-status/sync-state",
  "UriLocation": "http://localhost:9090/ack/event",
  "EndpointUri": "http://localhost:8080/api/ocloudNotifications/v1/subscriptions/{subscriptionid}"
}

Creating subscription golang example

package main
import (
	v1pubsub "github.com/redhat-cne/sdk-go/v1/pubsub"
    v1amqp "github.com/redhat-cne/sdk-go/v1/amqp"
	"github.com/redhat-cne/sdk-go/pkg/types"
)
func main(){
    //channel for the transport handler subscribed to get and set events  
    eventInCh := make(chan *channel.DataChan, 10)
    
    pubSubInstance = v1pubsub.GetAPIInstance(".")
    endpointURL := &types.URI{URL: url.URL{Scheme: "http", Host: "localhost:8080", Path: fmt.Sprintf("%s%s", apiPath, "dummy")}}
    // create subscription 
    pub, err := pubSubInstance.CreateSubscription(v1pubsub.NewPubSub(endpointURL, "test/test"))
    // once the subscription response is received, create a transport listener object to receive events.
    if err==nil{
        v1amqp.CreateListener(eventInCh, pub.GetResource())
    }
}

Rest-API to create a Publisher and Subscription.

Cloud-Event-Proxy container running with rest api plugin will be running a webservice and exposing following end points.

POST /api/cloudNotifications/v1/subscriptions
POST /api/cloudNotifications/v1/publishers
GET /api/cloudNotifications/v1/subscriptions
GET /api/cloudNotifications/v1/publishers
GET /api/cloudNotifications/v1/subscriptions/$subscriptionid
GET /api/cloudNotifications/v1/publishers/$publisherid
GET /api/cloudNotifications/v1/health
POST /api/cloudNotifications/v1/log
POST /api/cloudNotifications/v1/create/event

Code snippet to create pub/sub

// create publisher
pub, err := pubSubInstance.CreatePublisher(v1pubsub.NewPubSub(endpointURL, "test/test"))

//create subscription
sub, err := pubSubInstance.CreateSubscription(v1pubsub.NewPubSub(endpointURL, "test/test"))

Create Status Listener

// 1.Create Status Listener Fn (onStatusRequestFn is action to be performed on status ping received)
onStatusRequestFn := func(e v2.Event) error {
log.Printf("got status check call,fire events for above publisher")
event, _ := createPTPEvent(pub)
_ = common.PublishEvent(config, event)
return nil
}
// 2. Create Listener object  
v1amqp.CreateNewStatusListener(config.EventInCh, fmt.Sprintf("%s/%s", pub.Resource, "status"), onStatusRequestFn, nil)

AMQP Objects

Create AMQP Sender for Publisher object

package main

import (
  v1pubsub "github.com/redhat-cne/sdk-go/v1/pubsub"
  v1amqp "github.com/redhat-cne/sdk-go/v1/amqp"
)

v1amqp.CreateSender(eventInCh, pub.GetResource())

Create AMQP listener for subscription object

package main

import (
    v1pubsub "github.com/redhat-cne/sdk-go/v1/pubsub"
    v1amqp "github.com/redhat-cne/sdk-go/v1/amqp"
)

v1amqp.CreateListener(eventInCh, sub.GetResource())

PTP Events

The following example shows a Cloud Native Events serialized as JSON: (Following json should be validated with Cloud native events' event_spec.json schema)

{
    "id": "5ce55d17-9234-4fee-a589-d0f10cb32b8e",
    "type": "event.synchronization-state-chang",
    "time": "2021-02-05T17:31:00Z",
    "data": {
    "version": "v1.0",
    "values": [{
        "resource": "/cluster/node/ptp", 
        "data_type": "notification",
        "value_type": "enumeration",
        "value": "ACQUIRING-SYNC"
    }, {

        "resource": "/cluster/node/clock",
        "data_type": "metric",
        "value_type": "decimal64.3",
        "value": 100.3
    }]
    }
}

Event can be created via rest-api or calling sdk methods To produce or consume an event, the producer and consumer should have created publisher and subscription objects and should have access to the id of the publisher/subscription data objects.

import (
   v1event "github.com/redhat-cne/sdk-go/v1/event"
   cneevent "github.com/redhat-cne/sdk-go/pkg/event"
)

// create an event
event := v1event.CloudNativeEvent()
event.SetID(pub.ID)
event.Type = "ptp_status_type"
event.SetTime(types.Timestamp{Time: time.Now().UTC()}.Time)
event.SetDataContentType(cneevent.ApplicationJSON)
data := cneevent.Data{
Version: "v1",
Values: []cneevent.DataValue{
	    {
        Resource:  "/cluster/node/ptp",
        DataType:  cneevent.NOTIFICATION,
        ValueType: cneevent.ENUMERATION,
        Value:     cneevent.GNSS_ACQUIRING_SYNC,
        },
    },
}
data.SetVersion("v1") 
event.SetData(data)

Publisher event create via go-sdk

cloudEvent, _ := v1event.CreateCloudEvents(event, pub)
//send event to AMQP (rest API does this action by default)
v1event.SendNewEventToDataChannel(eventInCh, pub.Resource, cloudEvent)

Publisher event create via rest-api

//POST /api/ocloudNotifications/v1/create/event
if pub,err:=pubSubInstance.GetPublisher(publisherID);err==nil {
    url = fmt.SPrintf("%s%s", server.HostPath, "create/event")
    restClient.PostEvent(pub.EndPointURI.String(), event)
}

Metrics

sdk-go metrics

Cloud native events sdk-go comes with following metrics collectors .

  1. Number of events received by the transport
  2. Number of events published by the transport.
  3. Number of connection resets.
  4. Number of sender created
  5. Number of receiver created

rest-api metrics

Cloud native events rest API comes with following metrics collectors .

  1. Number of events published by the rest api.
  2. Number of active subscriptions.
  3. Number of active publishers.

cloud-event-proxy metrics

  1. Number of events produced.
  2. Number of events received.

Metrics details