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GCP

Detailed documentation on the GCP Pub/Sub component

Create a Dapr component

To set up GCP pub/sub, create a component of type pubsub.gcp.pubsub. See the pub/sub broker component file to learn how ConsumerID is automatically generated. Read the How-to: Publish and Subscribe guide on how to create and apply a pub/sub configuration.

apiVersion: dapr.io/v1alpha1
kind: Component
metadata:
  name: gcp-pubsub
spec:
  type: pubsub.gcp.pubsub
  version: v1
  metadata:
  - name: type
    value: service_account
  - name: projectId
    value: <PROJECT_ID> # replace
  - name: endpoint # Optional. 
    value: "http://localhost:8085"
  - name: consumerID # Optional - defaults to the app's own ID
    value: <CONSUMER_ID> 
  - name: identityProjectId
    value: <IDENTITY_PROJECT_ID> # replace
  - name: privateKeyId
    value: <PRIVATE_KEY_ID> #replace
  - name: clientEmail
    value: <CLIENT_EMAIL> #replace
  - name: clientId
    value: <CLIENT_ID> # replace
  - name: authUri
    value: https://accounts.google.com/o/oauth2/auth
  - name: tokenUri
    value: https://oauth2.googleapis.com/token
  - name: authProviderX509CertUrl
    value: https://www.googleapis.com/oauth2/v1/certs
  - name: clientX509CertUrl
    value: https://www.googleapis.com/robot/v1/metadata/x509/<PROJECT_NAME>.iam.gserviceaccount.com #replace PROJECT_NAME
  - name: privateKey
    value: <PRIVATE_KEY> # replace x509 cert
  - name: disableEntityManagement
    value: "false"
  - name: enableMessageOrdering
    value: "false"  
  - name: orderingKey # Optional
    value: <ORDERING_KEY>
  - name: maxReconnectionAttempts # Optional
    value: 30
  - name: connectionRecoveryInSec # Optional
    value: 2
  - name: deadLetterTopic # Optional
    value: <EXISTING_PUBSUB_TOPIC>
  - name: maxDeliveryAttempts # Optional
    value: 5

Spec metadata fields

Field Required Details Example
projectId Y GCP project id myproject-123
endpoint N GCP endpoint for the component to use. Only used for local development (for example) with GCP Pub/Sub Emulator. The endpoint is unnecessary when running against the GCP production API. "http://localhost:8085"
consumerID N The Consumer ID organizes one or more consumers into a group. Consumers with the same consumer ID work as one virtual consumer; for example, a message is processed only once by one of the consumers in the group. If the consumerID is not provided, the Dapr runtime set it to the Dapr application ID (appID) value. The consumerID, along with the topic provided as part of the request, are used to build the Pub/Sub subscription ID
identityProjectId N If the GCP pubsub project is different from the identity project, specify the identity project using this attribute "myproject-123"
privateKeyId N If using explicit credentials, this field should contain the private_key_id field from the service account json document "my-private-key"
privateKey N If using explicit credentials, this field should contain the private_key field from the service account json -----BEGIN PRIVATE KEY-----MIIBVgIBADANBgkqhkiG9w0B
clientEmail N If using explicit credentials, this field should contain the client_email field from the service account json "myservice@myproject-123.iam.gserviceaccount.com"
clientId N If using explicit credentials, this field should contain the client_id field from the service account json 106234234234
authUri N If using explicit credentials, this field should contain the auth_uri field from the service account json https://accounts.google.com/o/oauth2/auth
tokenUri N If using explicit credentials, this field should contain the token_uri field from the service account json https://oauth2.googleapis.com/token
authProviderX509CertUrl N If using explicit credentials, this field should contain the auth_provider_x509_cert_url field from the service account json https://www.googleapis.com/oauth2/v1/certs
clientX509CertUrl N If using explicit credentials, this field should contain the client_x509_cert_url field from the service account json https://www.googleapis.com/robot/v1/metadata/x509/myserviceaccount%40myproject.iam.gserviceaccount.com
disableEntityManagement N When set to "true", topics and subscriptions do not get created automatically. Default: "false" "true", "false"
enableMessageOrdering N When set to "true", subscribed messages will be received in order, depending on publishing and permissions configuration. "true", "false"
orderingKey N The key provided in the request. It’s used when enableMessageOrdering is set to true to order messages based on such key. “my-orderingkey”
maxReconnectionAttempts N Defines the maximum number of reconnect attempts. Default: 30 30
connectionRecoveryInSec N Time in seconds to wait between connection recovery attempts. Default: 2 2
deadLetterTopic N Name of the GCP Pub/Sub Topic. This topic must exist before using this component. "myapp-dlq"
maxDeliveryAttempts N Maximum number of attempts to deliver the message. If deadLetterTopic is specified, maxDeliveryAttempts is the maximum number of attempts for failed processing of messages. Once that number is reached, the message will be moved to the dead-letter topic. Default: 5 5
type N DEPRECATED GCP credentials type. Only service_account is supported. Defaults to service_account service_account

GCP Credentials

Since the GCP Pub/Sub component uses the GCP Go Client Libraries, by default it authenticates using Application Default Credentials. This is explained further in the Authenticate to GCP Cloud services using client libraries guide.

Create a GCP Pub/Sub


For local development, the GCP Pub/Sub Emulator is used to test the GCP Pub/Sub Component. Follow these instructions to run the GCP Pub/Sub Emulator.

To run the GCP Pub/Sub Emulator locally using Docker, use the following docker-compose.yaml:

version: '3'
services:
  pubsub:
    image: gcr.io/google.com/cloudsdktool/cloud-sdk:422.0.0-emulators
    ports:
      - "8085:8085"
    container_name: gcp-pubsub
    entrypoint: gcloud beta emulators pubsub start --project local-test-prj --host-port 0.0.0.0:8085

In order to use the GCP Pub/Sub Emulator with your pub/sub binding, you need to provide the endpoint configuration in the component metadata. The endpoint is unnecessary when running against the GCP Production API.

The projectId attribute must match the --project used in either the docker-compose.yaml or Docker command.

apiVersion: dapr.io/v1alpha1
kind: Component
metadata:
  name: gcp-pubsub
spec:
  type: pubsub.gcp.pubsub
  version: v1
  metadata:
  - name: projectId
    value: "local-test-prj"
  - name: consumerID
    value: "testConsumer"
  - name: endpoint
    value: "localhost:8085"

You can use either “explicit” or “implicit” credentials to configure access to your GCP pubsub instance. If using explicit, most fields are required. Implicit relies on dapr running under a Kubernetes service account (KSA) mapped to a Google service account (GSA) which has the necessary permissions to access pubsub. In implicit mode, only the projectId attribute is needed, all other are optional.

Follow the instructions here on setting up Google Cloud Pub/Sub system.


Last modified June 14, 2023: updates per mark (fa1cfd5a)