string template action String Template Action

Provided by: "Apache Software Foundation"

Support Level for this Kamelet is: "Preview"

Apply a String Template.

The template property needs to be encoded in base64, so when you pass it as parameter, don’t forget to encode it.

Configuration Options

The following table summarizes the configuration options available for the string-template-action Kamelet:

Property Name Description Type Default Example

template *

Template

The inline template

binary
Fields marked with (*) are mandatory.

Usage

This section summarizes how the string-template-action can be used in various contexts.

Knative Action

The string-template-action Kamelet can be used as intermediate step in a Knative binding.

string-template-action-binding.yaml
apiVersion: camel.apache.org/v1alpha1
kind: KameletBinding
metadata:
  name: string-template-action-binding
spec:
  source:
    ref:
      kind: Kamelet
      apiVersion: camel.apache.org/v1alpha1
      name: timer-source
    properties:
      message: "Hello"
  steps:
  - ref:
      kind: Kamelet
      apiVersion: camel.apache.org/v1alpha1
      name: string-template-action
    properties:
      template: "The Template"
  sink:
    ref:
      kind: Channel
      apiVersion: messaging.knative.dev/v1
      name: mychannel

Make sure you have Camel K installed into the Kubernetes cluster you’re connected to.

Save the string-template-action-binding.yaml file into your hard drive, then configure it according to your needs.

You can run the action using the following command:

kubectl apply -f string-template-action-binding.yaml

Dependencies

The Kamelet needs the following dependencies:

  • camel:stringtemplate

  • camel:kamelet

Binding to Knative using the Kamel CLI:

The procedure described above can be simplified into a single execution of the kamel bind command:

kamel bind timer-source?message=Hello --step string-template-action -p "step-0.template=The Template" channel:mychannel

This will create the KameletBinding under the hood and apply it to the current namespace in the cluster.

Kafka Action

The string-template-action Kamelet can be used as intermediate step in a Kafka binding.

string-template-action-binding.yaml
apiVersion: camel.apache.org/v1alpha1
kind: KameletBinding
metadata:
  name: string-template-action-binding
spec:
  source:
    ref:
      kind: Kamelet
      apiVersion: camel.apache.org/v1alpha1
      name: timer-source
    properties:
      message: "Hello"
  steps:
  - ref:
      kind: Kamelet
      apiVersion: camel.apache.org/v1alpha1
      name: string-template-action
    properties:
      template: "The Template"
  sink:
    ref:
      kind: KafkaTopic
      apiVersion: kafka.strimzi.io/v1beta1
      name: my-topic

Ensure that you’ve installed Strimzi and created a topic named my-topic in the current namespace. Make also sure you have Camel K installed into the Kubernetes cluster you’re connected to.

Save the string-template-action-binding.yaml file into your hard drive, then configure it according to your needs.

You can run the action using the following command:

kubectl apply -f string-template-action-binding.yaml

Binding to Kafka using the Kamel CLI:

The procedure described above can be simplified into a single execution of the kamel bind command:

kamel bind timer-source?message=Hello --step string-template-action -p "step-0.template=The Template" kafka.strimzi.io/v1beta1:KafkaTopic:my-topic

This will create the KameletBinding under the hood and apply it to the current namespace in the cluster.

Kamelet source file

Have a look at the following link:

https://github.com/apache/camel-kamelets/blob/main/string-template-action.kamelet.yaml

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