google pubsub source Google Pubsub Source

Provided by: "Apache Software Foundation"

Support Level for this Kamelet is: "Preview"

Consume messages from Google Pubsub.

The serviceAccountKey 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 google-pubsub-source Kamelet:

Property Name Description Type Default Example

projectId *

Project Id

The Google Cloud PubSub Project Id

string

serviceAccountKey *

Service Account Key

The Service account key that can be used as credentials for the PubSub publisher/subscriber

binary

subscriptionName *

Subscription Name

The Subscription Name

string

concurrentConsumers

Concurrent Consumers

The number of parallel streams consuming from the subscription

integer

1

maxMessagesPerPoll

Max Messages Per Poll

The max number of messages to receive from the server in a single API call

integer

1

synchronousPull

Synchronous Pull

If Synchronously pull batches of messages is enabled or not

boolean

false

Fields marked with an asterisk (*) are mandatory.

Dependencies

At runtime, the google-pubsub-source Kamelet relies upon the presence of the following dependencies:

  • camel:kamelet

  • camel:google-pubsub

  • camel:jackson

Usage

This section describes how you can use the google-pubsub-source.

Knative Source

You can use the google-pubsub-source Kamelet as a Knative source by binding it to a Knative object.

google-pubsub-source-binding.yaml
apiVersion: camel.apache.org/v1alpha1
kind: KameletBinding
metadata:
  name: google-pubsub-source-binding
spec:
  source:
    ref:
      kind: Kamelet
      apiVersion: camel.apache.org/v1alpha1
      name: google-pubsub-source
    properties:
      projectId: "The Project Id"
      serviceAccountKey: "The Service Account Key"
      subscriptionName: "The Subscription Name"
  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 google-pubsub-source-binding.yaml file to your local drive, and then edit it as needed for your configuration.

  2. Run the source by using the following command:

    kubectl apply -f google-pubsub-source-binding.yaml

Procedure for using the Kamel CLI

Configure and run the source by using the following command:

kamel bind google-pubsub-source -p "source.projectId=The Project Id" -p "source.serviceAccountKey=The Service Account Key" -p "source.subscriptionName=The Subscription Name" channel:mychannel

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

Kafka Source

You can use the google-pubsub-source Kamelet as a Kafka source by binding it to a Kafka topic.

google-pubsub-source-binding.yaml
apiVersion: camel.apache.org/v1alpha1
kind: KameletBinding
metadata:
  name: google-pubsub-source-binding
spec:
  source:
    ref:
      kind: Kamelet
      apiVersion: camel.apache.org/v1alpha1
      name: google-pubsub-source
    properties:
      projectId: "The Project Id"
      serviceAccountKey: "The Service Account Key"
      subscriptionName: "The Subscription Name"
  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 google-pubsub-source-binding.yaml file to your local drive, and then edit it as needed for your configuration.

  2. Run the source by using the following command:

    kubectl apply -f google-pubsub-source-binding.yaml

Procedure for using the Kamel CLI

Configure and run the source by using the following command:

kamel bind google-pubsub-source -p "source.projectId=The Project Id" -p "source.serviceAccountKey=The Service Account Key" -p "source.subscriptionName=The Subscription Name" kafka.strimzi.io/v1beta1:KafkaTopic:my-topic

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