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Chapter 20. Has Header Filter Action

Filter based on the presence of one header

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

Expand
PropertyNameDescriptionTypeDefaultExample

name *

Header Name

The header name to evaluate. The header name must be passed by the source Kamelet. For Knative only, if you are using Cloud Events, you must include the CloudEvent (ce-) prefix in the header name.

string

 

"headerName"

Note

Fields marked with an asterisk (*) are mandatory.

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

  • camel:core
  • camel:kamelet

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

20.3.1. Knative Action
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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/v1alpha1
kind: KameletBinding
metadata:
  name: has-header-filter-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: insert-header-action
    properties:
      name: "my-header"
      value: "my-value"
  - ref:
      kind: Kamelet
      apiVersion: camel.apache.org/v1alpha1
      name: has-header-filter-action
    properties:
      name: "my-header"
  sink:
    ref:
      kind: Channel
      apiVersion: messaging.knative.dev/v1
      name: mychannel
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20.3.1.1. Prerequisite
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Make sure you have "Red Hat Integration - Camel K" installed into the OpenShift cluster you’re connected to.

20.3.1.2. Procedure for using the cluster CLI
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  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: 

    oc apply -f has-header-filter-action-binding.yaml
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20.3.1.3. Procedure for using the Kamel CLI
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Configure and run the action by using the following command: 

kamel bind --name has-header-filter-action-binding timer-source?message="Hello" --step insert-header-action -p "step-0.name=my-header" -p "step-0.value=my-value" --step has-header-filter-action -p "step-1.name=my-header" channel:mychannel
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This command creates the KameletBinding in the current namespace on the cluster.

20.3.2. Kafka Action
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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/v1alpha1
kind: KameletBinding
metadata:
  name: has-header-filter-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: insert-header-action
    properties:
      name: "my-header"
      value: "my-value"
  - ref:
      kind: Kamelet
      apiVersion: camel.apache.org/v1alpha1
      name: has-header-filter-action
    properties:
      name: "my-header"
  sink:
    ref:
      kind: KafkaTopic
      apiVersion: kafka.strimzi.io/v1beta1
      name: my-topic
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20.3.2.1. Prerequisites
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Ensure that you’ve installed the AMQ Streams operator in your OpenShift cluster and created a topic named my-topic in the current namespace. Make also sure you have "Red Hat Integration - Camel K" installed into the OpenShift cluster you’re connected to.

20.3.2.2. Procedure for using the cluster CLI
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  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: 

    oc apply -f has-header-filter-action-binding.yaml
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20.3.2.3. Procedure for using the Kamel CLI
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Configure and run the action by using the following command: 

kamel bind --name has-header-filter-action-binding timer-source?message="Hello" --step insert-header-action -p "step-0.name=my-header" -p "step-0.value=my-value" --step has-header-filter-action -p "step-1.name=my-header" kafka.strimzi.io/v1beta1:KafkaTopic:my-topic
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This command creates the KameletBinding in the current namespace on the cluster.

20.4. Kamelet source file
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https://github.com/openshift-integration/kamelet-catalog/blob/kamelet-catalog-1.6/has-header-filter-action.kamelet.yaml

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