has header filter action Has Header Filter Action

Provided by: "Apache Software Foundation"

Support Level for this Kamelet is: "Stable"

Filter message based on the presence of one header

Configuration Options

The following table summarizes the configuration options available for the has-header-filter-action Kamelet:

Property Name Description Type Default Example

name

Header Name

Required The header name to evaluate. The header name must be passed by the source Kamelet. For Knative only, the name of the header requires a CloudEvent (ce-) prefix.

string

headerName

value

Header Value

An optional header value to compare the header to.

string

headerValue

Dependencies

At runtime, the has-header-filter-action Kamelet relies upon the presence of the following dependencies:

  • camel:core

  • camel:kamelet

Camel JBang usage

Prerequisites

  • You’ve installed JBang.

  • You have executed the following command:

jbang app install camel@apache/camel

Supposing you have a file named route.yaml with this content:

- route:
    from:
      uri: "kamelet:timer-source"
      parameters:
        period: 10000
        message: 'test'
      steps:
        - to:
            uri: "kamelet:log-sink"

You can now run it directly through the following command

camel run route.yaml

Camel K Environment Usage

This section describes how you can use the has-header-filter-action.

Knative action

You can use the has-header-filter-action Kamelet as an intermediate step in a Knative binding.

has-header-filter-action-binding.yaml
apiVersion: camel.apache.org/v1
kind: KameletBinding
metadata:
  name: has-header-filter-action-binding
spec:
  source:
    ref:
      kind: Kamelet
      apiVersion: camel.apache.org/v1
      name: kafka-source
      properties:
        bootstrapServers: localhost:9092
        topic: mytopic
        user: kafka
        password: kafka123!
  steps:
    - ref:
        kind: Kamelet
        apiVersion: camel.apache.org/v1
        name: has-header-filter-action
      properties:
        name: headerName
  sink:
    ref:
      kind: Channel
      apiVersion: messaging.knative.dev/v1
      name: mychannel

Prerequisite

You have Camel K installed on the cluster.

Procedure for using the cluster CLI

  1. Save the has-header-filter-action-binding.yaml file to your local drive, and then edit it as needed for your configuration.

  2. Run the action by using the following command:

    kubectl apply -f has-header-filter-action-binding.yaml

Procedure for using the Kamel CLI

Configure and run the action by using the following command:

kamel bind channel:mychannel -p "step-0.name=headerName" has-header-filter-action

This command creates the KameletBinding in the current namespace on the cluster.

Kafka action

You can use the has-header-filter-action Kamelet as an intermediate step in a Kafka binding.

has-header-filter-action-binding.yaml
apiVersion: camel.apache.org/v1
kind: KameletBinding
metadata:
  name: has-header-filter-action-binding
spec:
  source:
    ref:
      kind: Kamelet
      apiVersion: camel.apache.org/v1
      name: kafka-source
      properties:
        bootstrapServers: localhost:9092
        topic: mytopic
        user: kafka
        password: kafka123!
  steps:
    - ref:
        kind: Kamelet
        apiVersion: camel.apache.org/v1
        name: has-header-filter-action
      properties:
        name: headerName
  sink:
    ref:
      kind: KafkaTopic
      apiVersion: kafka.strimzi.io/v1beta1
      name: my-topic

Prerequisites

  • You’ve installed Strimzi.

  • You’ve created a topic named my-topic in the current namespace.

  • You have Camel K installed on the cluster.

Procedure for using the cluster CLI

  1. Save the has-header-filter-action-binding.yaml file to your local drive, and then edit it as needed for your configuration.

  2. Run the action by using the following command:

    kubectl apply -f has-header-filter-action-binding.yaml

Procedure for using the Kamel CLI

Configure and run the action by using the following command:

kamel bind kafka.strimzi.io/v1beta1:KafkaTopic:my-topic -p "step-0.name=headerName" has-header-filter-action

This command creates the KameletBinding in the current namespace on the cluster.

Kamelet source file

https://github.com/apache/camel-kamelets/blob/main/kamelets/has-header-filter-action.kamelet.yaml

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