Developing PTP events consumer applications with the REST API v2

func server() {
  http.HandleFunc("/event", getEvent)
  http.ListenAndServe(":9043", nil)
}

func getEvent(w http.ResponseWriter, req *http.Request) {
  defer req.Body.Close()
  bodyBytes, err := io.ReadAll(req.Body)
  if err != nil {
    log.Errorf("error reading event %v", err)
  }
  e := string(bodyBytes)
  if e != "" {
    processEvent(bodyBytes)
    log.Infof("received event %s", string(bodyBytes))
  } else {
    w.WriteHeader(http.StatusNoContent)
  }
}

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

// Subscribe to PTP events using v2 REST API
s1,_:=createsubscription("/cluster/node/<node_name>/sync/sync-status/sync-state")
s2,_:=createsubscription("/cluster/node/<node_name>/sync/ptp-status/lock-state")
s3,_:=createsubscription("/cluster/node/<node_name>/sync/gnss-status/gnss-sync-status")
s4,_:=createsubscription("/cluster/node/<node_name>/sync/sync-status/os-clock-sync-state")
s5,_:=createsubscription("/cluster/node/<node_name>/sync/ptp-status/clock-class")

// Create PTP event subscriptions POST
func createSubscription(resourceAddress string) (sub pubsub.PubSub, err error) {
  var status int
  apiPath := "/api/ocloudNotifications/v2/"
  localAPIAddr := "localhost:8989" // vDU service API address
  apiAddr := "ptp-event-publisher-service-<node_name>.openshift-ptp.svc.cluster.local:9043" (1)
  apiVersion := "2.0"

  subURL := &types.URI{URL: url.URL{Scheme: "http",
    Host: apiAddr
    Path: fmt.Sprintf("%s%s", apiPath, "subscriptions")}}
  endpointURL := &types.URI{URL: url.URL{Scheme: "http",
    Host: localAPIAddr,
    Path: "event"}}

  sub = v1pubsub.NewPubSub(endpointURL, resourceAddress, apiVersion)
  var subB []byte

  if subB, err = json.Marshal(&sub); err == nil {
    rc := restclient.New()
    if status, subB = rc.PostWithReturn(subURL, subB); status != http.StatusCreated {
      err = fmt.Errorf("error in subscription creation api at %s, returned status %d", subURL, status)
    } else {
      err = json.Unmarshal(subB, &sub)
    }
  } else {
    err = fmt.Errorf("failed to marshal subscription for %s", resourceAddress)
  }
  return
}

//Get PTP event state for the resource
func getCurrentState(resource string) {
  //Create publisher
  url := &types.URI{URL: url.URL{Scheme: "http",
    Host: "ptp-event-publisher-service-<node_name>.openshift-ptp.svc.cluster.local:9043", (1)
    Path: fmt.SPrintf("/api/ocloudNotifications/v2/%s/CurrentState",resource}}
  rc := restclient.New()
  status, event := rc.Get(url)
  if status != http.StatusOK {
    log.Errorf("CurrentState:error %d from url %s, %s", status, url.String(), event)
  } else {
    log.Debugf("Got CurrentState: %s ", event)
  }
}

apiVersion: v1
kind: Namespace
metadata:
  name: cloud-events
  labels:
    security.openshift.io/scc.podSecurityLabelSync: "false"
    pod-security.kubernetes.io/audit: "privileged"
    pod-security.kubernetes.io/enforce: "privileged"
    pod-security.kubernetes.io/warn: "privileged"
    name: cloud-events
    openshift.io/cluster-monitoring: "true"
  annotations:
    workload.openshift.io/allowed: management

apiVersion: apps/v1
kind: Deployment
metadata:
  name: cloud-consumer-deployment
  namespace: cloud-events
  labels:
    app: consumer
spec:
  replicas: 1
  selector:
    matchLabels:
      app: consumer
  template:
    metadata:
      annotations:
        target.workload.openshift.io/management: '{"effect": "PreferredDuringScheduling"}'
      labels:
        app: consumer
    spec:
      nodeSelector:
        node-role.kubernetes.io/worker: ""
      serviceAccountName: consumer-sa
      containers:
        - name: cloud-event-consumer
          image: cloud-event-consumer
          imagePullPolicy: Always
          args:
            - "--local-api-addr=consumer-events-subscription-service.cloud-events.svc.cluster.local:9043"
            - "--api-path=/api/ocloudNotifications/v2/"
            - "--api-addr=127.0.0.1:8089"
            - "--api-version=2.0"
            - "--http-event-publishers=ptp-event-publisher-service-NODE_NAME.openshift-ptp.svc.cluster.local:9043"
          env:
            - name: NODE_NAME
              valueFrom:
                fieldRef:
                  fieldPath: spec.nodeName
            - name: CONSUMER_TYPE
              value: "PTP"
            - name: ENABLE_STATUS_CHECK
              value: "true"
      volumes:
        - name: pubsubstore
          emptyDir: {}

apiVersion: v1
kind: ServiceAccount
metadata:
  name: consumer-sa
  namespace: cloud-events

apiVersion: v1
kind: Service
metadata:
  annotations:
    prometheus.io/scrape: "true"
  name: consumer-events-subscription-service
  namespace: cloud-events
  labels:
    app: consumer-service
spec:
  ports:
    - name: sub-port
      port: 9043
  selector:
    app: consumer
  sessionAffinity: None
  type: ClusterIP