PingSource

    A PingSource produces events with a fixed payload on a specified cron schedule.

    The PingSource source type is enabled by default when you install Knative Eventing.

    This example shows how to send an event every second to a Event Display Service.

    In this step, you create one event consumer, event-display to verify that PingSource is properly working.

    To deploy the event-display consumer to your cluster, run the following command:

    1. kubectl -n pingsource-example apply -f - << EOF
    2. apiVersion: apps/v1
    3. kind: Deployment
    4. metadata:
    5.   name: event-display
    6. spec:
    7.   replicas: 1
    8.   selector:
    9.     matchLabels: &labels
    10.       app: event-display
    11.     metadata:
    12.       labels: *labels
    13.     spec:
    14.       containers:
    15.         - name: event-display
    18. ---
    20. kind: Service
    21. apiVersion: v1
    22. metadata:
    23.   name: event-display
    24. spec:
    25.   selector:
    26.     app: event-display
    27.   ports:
    28.   - protocol: TCP
    29.     port: 80
    30. EOF

    You can now create the PingSource sending an event containing {"message": "Hello world!"} every second.

    1. kn source ping create test-ping-source \
    2.   --namespace pingsource-example
    4.   --data '{"message": "Hello world!"}' \
    5.   --sink http://event-display.svc.cluster.local

    This returns the Attributes and Data of the events that the PingSource sent to the event-display Service:

    1. ☁️  cloudevents.Event
    2. Validation: valid
    3. Context Attributes,
    4.   specversion: 1.0
    5.   type: dev.knative.sources.ping
    6.   source: /apis/v1/namespaces/default/pingsources/test-ping-source
    7.   id: d8e761eb-30c7-49a3-a421-cd5895239f2d
    8.   time: 2019-12-04T14:24:00.000702251Z
    9.   datacontenttype: application/json
    10. Data,
    11.   {
    12.   }

    Delete the namespace and all of its resources from your cluster by entering the following command:

    See the PingSource specification.