Creating a RedisStreamSource

Creating a RedisStreamSource

This topic describes how to create a RedisStreamSource object.

Install the RedisStreamSource add-on

RedisStreamSource is a Knative Eventing add-on.

Install RedisStreamSource by running the command:

kubectl apply -f https://github.com/knative-extensions/eventing-redis/releases/download/knative-v1.15.0/redis-source.yaml

Verify that redis-controller-manageris running:

kubectl get deployments.apps -n knative-sources

Example output:

NAME                           READY   UP-TO-DATE   AVAILABLE   AGE
redis-controller-manager        1/1     1            1           3s

Create a Service

Create the event-display Service as a YAML file:

apiVersion: serving.knative.dev/v1
kind: Service
metadata:
  name: event-display
  namespace: default
spec:
  template:
    spec:
      containers:
        - # This corresponds to
          # https://github.com/knative/eventing/tree/main/cmd/event_display/main.go
          image: gcr.io/knative-releases/knative.dev/eventing/cmd/event_display

Apply the YAML file by running the command:
```
kubectl apply -f <filename>.yaml
```
Where <filename> is the name of the file you created in the previous step.

Example output:
```
service.serving.knative.dev/event-display created
```

Ensure that the Service Pod is running, by running the command:

kubectl get pods

The Pod name is prefixed with event-display:

NAME                                            READY     STATUS    RESTARTS   AGE
event-display-00001-deployment-5d5df6c7-gv2j4   2/2       Running   0          72s

Create a RedisStreamSource object

Create the RedisStreamSource object using the YAML template below:

apiVersion: sources.knative.dev/v1alpha1
kind: RedisStreamSource
metadata:
  name: <redis-stream-source>
spec:
  address: <redis-uri>
  stream: <redis-stream-name>
  group: <consumer-group-name>
  sink: <sink>

Where:

<redis-stream-source> is the name of your source. (required)
<redis-uri> is the Redis URI. See the Redis documentation for more information. (required)
<redis-stream-name> is the name of the Redis stream. (required)
<consumer-group-name> is the name of the Redis consumer group. When left empty a group is automatically created for this source, and deleted when this source is deleted. (optional)
<sink> is where to send events. (required)
Apply the YAML file by running the command:
```
kubectl apply -f <filename>
```
Where <filename> is the name of the file you created in the previous step.

Verify the RedisStreamSource object

View the logs for the event-display event consumer by running the command:

kubectl logs -l app=event-display --tail=100

Sample output:

☁️  cloudevents.Event
Validation: valid
Context Attributes,
  specversion: 1.0
  type: dev.knative.sources.redisstream
  source: /mystream
  id: 1597775814718-0
  time: 2020-08-18T18:36:54.719802342Z
  datacontenttype: application/json
Data,
  [
    "fruit",
    "banana"
    "color",
    "yellow"
  ]

Delete the RedisStreamSource object

Delete the RedisStreamSource object:
```
kubectl delete -f <filename>
```

Additional information

For more information about Redis Stream source, see the eventing-redis Github repository