🎉 Preview of IntegrationSource, showing SQS notification processing

Signed-off-by: Matthias Wessendorf <[email protected]>

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           - releases/announcing-knative-v0-2-release.md
       - Articles:
+          - articles/consuming_sqs_data_with_integrationsource.md
           - articles/knative-backstage-security.md
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blog/docs/articles/consuming_sqs_data_with_integrationsource.md

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+# Consuming AWS SQS Events with Knative Eventing
+
+**Author: Matthias Weßendorf, Senior Principal Software Engineer @ Red Hat**
+
+_In a [previous post](/blog/articles/consuming_s3_data_with_knative){:target="_blank"} we discussed the consumption of notifications from an AWS S3 bucket using Apache Camel K. While this is a good approach for getting data from cloud providers, like AWS, into Knative, the Knative Eventing team is aiming to integrate this at the core of its offering with a new CRD, the `IntegrationSource`. This post will describe howto receive SQS notifications and forward them to a regular Knative Broker for further processing._
+
+## Installation
+
+The `IntegrationSource` will be part of Knative Eventing in a future release. Currently it is under development but already included in the `main` branch. For installing Knative Eventing from the sources you can follow the [develpoment guide](https://github.com/knative/eventing/blob/main/DEVELOPMENT.md){:target="_blank"}.
+
+!!! note
+
+    Installing Knative Eventing from the source repository is not recommended for production cases. The purpose of this blog post is to give an early introduction to the new `IntegrationSource` CRD..
+
+## Creating a Knative Broker instance
+
+Once the `main` branch of Knative Eventing is installed we are using a Knative Broker as the heart of our system, acting as an [Event Mesh](https://knative.dev/docs/eventing/event-mesh/){:target="_blank"} for both event producers and event consumers:
+
+```yaml
+apiVersion: eventing.knative.dev/v1
+kind: Broker
+metadata:
+  namespace: default
+  name: my-broker
+```
+
+Now event producers can send events to it and event consumers can receive events.
+
+## Using IntegrationSource for AWS SQS
+
+In order to send data from AWS SQS to a Knative component, like the broker we created above, we are using the new `IntegrationSource` CRD. It basically allows to declaratively move data from a system, like AWS SQS, _towards_ a Knative resource, like our above Broker:
+
+```yaml
+apiVersion: sources.knative.dev/v1alpha1
+kind: IntegrationSource
+metadata:
+  name: aws-sqs-source
+spec:
+  aws:
+    sqs:
+      queueNameOrArn: "my-queue"
+      region: "my-queue"
+      visibilityTimeout: 20
+    auth:
+      secret:
+        ref:
+          name: "my-secret"
+  sink:
+    ref:
+      apiVersion: eventing.knative.dev/v1
+      kind: Broker
+      name: my-broker
+```
+
+The `IntegrationSource` has an `aws` field, for defining different Amazon Web Services, such as `s3`, `ddb-streams` or like in this case `sqs`. Underneath the `aws` property is also a reference to a _Kubernetes Secret_, which contains the credentials for connecting to AWS. All SQS notifications are processed by the source and being forwarded as CloudEvents to the provided `sink`
+
+!!! note
+
+    If you compare the `IntegrationSource` to the `Pipe` from Apache Camel on the [previous article](/blog/articles/consuming_s3_data_with_knative){:target="_blank"} you will notice the new resource is less verbose and is directly following established Knative development principles, like any other Knative Event Source.
+
+## Creating the Kubernetes Secret for the IntegrationSource
+
+For connecting to any AWS service the `IntegrationSource` uses regular Kubernetes `Secret`s, present in the namespace of the resource. The `Secret` can be created like:
+
+```
+$ kubectl -n <namespace> create secret generic <secret-name> --from-literal=aws.accessKey=<...> --from-literal=aws.secretKey=<...> 
+```
+
+## Setting up the Consumer application
+
+Now that we have the `Broker` and the `IntegrationSource` connected to it, it is time to define an application that is receiving _and_ processing the SQS notifications:
+
+```yaml
+apiVersion: v1
+kind: Pod
+metadata:
+  name: log-receiver
+  labels:
+    app: log-receiver
+spec:
+  containers:
+  - name: log-receiver
+    image: gcr.io/knative-releases/knative.dev/eventing/cmd/event_display
+    imagePullPolicy: Always
+    ports:
+    - containerPort: 8080
+      protocol: TCP
+      name: log-receiver
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: log-receiver
+spec:
+  selector:
+    app: log-receiver
+  ports:
+    - port: 80
+      protocol: TCP
+      targetPort: log-receiver
+      name: http
+```
+
+Here we define a simple `Pod` and its `Service`, which points to an HTTP-Server, that receives the CloudEvents. As you can see, this is **not** a AWS SQS specific consumer. Basically _any_ HTTP Webserver, in any given language, can be used for processing the CloudEvents coming from a Knative Broker.
+
+## Subscribe the Consumer application to AWS SQS events
+
+In order to be able to receive the SQS event notifications, we need to create a `Trigger` for our _Consumer application_:
+
+```yaml
+apiVersion: eventing.knative.dev/v1
+kind: Trigger
+metadata:
+  name: aws-sqs-trigger
+spec:
+  broker: my-broker
+  subscriber:
+    ref:
+      apiVersion: v1
+      kind: Service
+      name: log-receiver
+```
+
+For debugging purpose we create a `Trigger` without any `filters` so it will forward _all_ CloudEvents to the `log-receiver` application. Once deployed, in the log of the `log-receiver` pod we should be seeing the following for any produced SQS notification on our queue:
+
+```
+☁️  cloudevents.Event
+Context Attributes,
+  specversion: 1.0
+  type: dev.knative.connector.event.aws-sqs
+  source: dev.knative.eventing.aws-sqs-source
+  subject: aws-sqs-source
+  id: 9CC70D09569020C-0000000000000001
+  time: 2024-11-08T07:34:16.413Z
+  datacontenttype: application/json
+Extensions,
+  knativearrivaltime: 2024-11-08T07:34:16.487697262Z
+Data,
+  <test data notification>
+```
+
+## Conclusion and Outlook
+
+With the new `IntegrationSource` we will have a good way to integrate services from public cloud providers like AWS, by leveraging Apache Camel Kamelets behind the scenese. The initial set of services is on AWS, like `s3`, `sqs` or `ddb-streams`. However we are planning to add support for different services and providers. 
+
+Since Apache Camel Kamelets can also act as `Sink`s, the team is working on providing a `IntegrationSink`, following same principles.