Trigger with events

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You can create an Eventarc trigger so that your Cloud Run service receives notifications of a specified event or set of events. By specifying filters for the trigger, you can configure the routing of the event, including the event source and the target Cloud Run service.

Events sent to your Cloud Run service are received in the form of HTTP requests.

The following event types trigger requests to your service:

This page shows you how to create a trigger through the Cloud Run console page.

You can also create an Eventarc trigger using the Google Cloud CLI or through the Eventarc console page.

Prepare to create a trigger

Before you create a trigger, complete these prerequisites:

  1. Eventarc uses a customer-provided service account as the identity of the trigger. Ensure that you grant the required roles and permissions to the trigger's service account.

    For example, to send events to a Cloud Run service that requires authentication, the service account for the Eventarc trigger must have the Cloud Run Invoker Identity and Access Management (IAM) role.

  2. If you are creating a trigger for a direct event from Cloud Storage, grant the pubsub.publisher role to the Cloud Storage service account:

    SERVICE_ACCOUNT="$(gsutil kms serviceaccount -p PROJECT_ID)"
    
    gcloud projects add-iam-policy-binding PROJECT_ID \
        --member="serviceAccount:${SERVICE_ACCOUNT}" \
        --role='roles/pubsub.publisher'
    

    Replace PROJECT_ID with your Google Cloud project ID. You can find your project ID on the Dashboard page of the Google Cloud console.

Create a trigger through the console

You can use the Cloud Run console page to create an Eventarc trigger.

  1. If necessary, enable the Eventarc API.

    Enable the API

  2. In the Google Cloud console, go to Cloud Run.

    Go to Cloud Run

  3. From the list of services, click an existing service, or create a new service.

  4. On the Service details page, click the Triggers tab.

  5. Click Add Eventarc trigger.

    The Eventarc trigger pane opens. To determine how best to route events, see Event routing options.

  6. Type a Trigger name.

    This is the ID of the trigger and it must start with a letter. It can contain up to 63 lowercase letters, numbers, or hyphens.

  7. Select an Event provider.

    This is the Google or partner service that is the source of events. For example, select BigQuery.

  8. Select an Event.

    • Custom events—Applies to a Cloud Pub/Sub event provider
    • Direct events—Applies to some event providers only
    • via Cloud Audit Logs events—Applies to all event providers

    Custom

    Requests to your service are triggered when a message is published to a Pub/Sub topic. This applies to a Cloud Pub/Sub event provider.

    1. From the events listed under Custom, select Cloud Pub/Sub topic.

    2. Select an existing topic or accept the default of None so that a new topic is created for the trigger.

      The existing Pub/Sub topic must be in the same project as the trigger.

      By default, Pub/Sub subscriptions created for Eventarc persist regardless of activity and do not expire. To change the inactivity duration, see Manage subscriptions.

      As a best practice, we recommend not to reuse the Pub/Sub topic created by a trigger because deleting an Eventarc trigger also deletes any Pub/Sub topics that were created by the trigger.

    3. Select a Region.

      Pub/Sub triggers for Eventarc are only available in single-region locations, and you cannot create a global Eventarc trigger.

    Direct

    Cloud Storage

    Requests to your service are triggered in response to an event inside a Cloud Storage bucket—object creation, deletion, archiving, and metadata updates. This applies to a Cloud Storage event provider.

    1. From the events listed under Direct, select one of the following:

      • google.cloud.storage.object.v1.archived: Event is sent when a live version of an object is archived or deleted. This event is only sent for versioning buckets.
      • google.cloud.storage.object.v1.delete: Event is sent when an object is permanently deleted. Depending on the object versioning setting for a bucket this means:
        • For versioning buckets, this is only sent when a version is permanently deleted (but not when an object is archived).
        • For non-versioning buckets, this is sent when an object is deleted or overwritten.
      • google.cloud.storage.object.v1.finalized: Event is sent when a new object is created (or an existing object is overwritten, and a new generation of that object is created) in the bucket
      • google.cloud.storage.object.v1.metadataUpdated: Event is sent when the metadata of an existing object changes.
    2. Specify or browse for the globally unique identifier of the Cloud Storage Bucket.

      The Cloud Storage bucket must reside in the same Google Cloud project and region or multi-region as the Eventarc trigger.

    3. Select a Region.

      Cloud Storage triggers for Eventarc are available in single-region, dual-region, and multi-region locations. Note that the Cloud Storage bucket must reside in the same Google Cloud project and region or multi-region as the Eventarc trigger.

    Events are delivered using Pub/Sub notifications from Cloud Storage. Setting up too many notifications registered against the same bucket might exhaust the notification limit for the bucket as indicated by the error Cloud Storage bucket ...: Pub/Sub notification limit reached. The bucket can have up to 10 notification configurations set to trigger for a specific event. See more quotas and limitations in the Cloud Storage quotas and limits page.

    Firebase Alerts

    Requests to your service are triggered in response to an event when a Firebase alert is published by a Firebase service.

    1. From the events listed under Direct, select google.firebase.firebasealerts.alerts.v1.published.

    2. In the Region list, select global (Global).

      For more information, see Eventarc locations.

    3. In the Filters section, for the alerttype attribute, select one of the following as the operator:

    4. In the Attribute value 1 field, select one of the following:

      • appDistribution.inAppFeedback: event is sent when a tester submits in-app feedback for a given app
      • appDistribution.newTesterIosDevice: event is sent when a new iOS tester device is registered for a given app
      • billing.planAutomatedUpdate: event is sent when the billing plan for a Firebase project is automatically updated; for example, when a plan is downgraded due to payment issues
      • billing.planUpdate: event is sent when the billing plan for a Firebase project is modified by a user; for example, when a billing account is attached to or detached from a project
      • crashlytics.newAnrIssue: event is sent when an app experiences a new application not responding (ANR) error (not for any subsequent, identical events)
      • crashlytics.newFatalIssue: event is sent when an app experiences a new fatal crash (not for any subsequent, identical events)
      • crashlytics.newNonfatalIssue: event is sent when an app experiences a new non-fatal error (not for any subsequent, identical events)
      • crashlytics.regression: event is sent when an app experiences a crash for an issue marked as closed for a previous app version
      • crashlytics.stabilityDigest: event is sent when there is a notification of the top trending issues in Crashlytics
      • crashlytics.velocity: event is sent when a single issue is responsible for causing a significant number of app sessions to crash
      • performance.threshold: event is sent when the performance of a metric crosses the set threshold

    5. Optionally, you can filter events for a specific Firebase App ID. Click Add filter and specify the appid.

      It must be an exact match.

    Firebase Realtime Database

    Requests to your service are triggered in response to an event when data is created, updated, or deleted in the Firebase Realtime Database.

    1. From the events listed under Direct, select one of the following:

      • google.firebase.database.ref.v1.created: event is sent when data is created in the database
      • google.firebase.database.ref.v1.updated: event is sent when data is updated in the database
      • google.firebase.database.ref.v1.deleted: event is sent when data is deleted in the database
      • google.firebase.database.ref.v1.written: event is sent when data is created, updated, or deleted in the database
    2. In the Region list, select a region.

      Note that this region should match the region of the Firebase Realtime Database instance. For more information, see Eventarc locations.

    3. In the Filters section, select the following:

      1. For the database instance attribute, select one of the following as the operator:
      2. In the Attribute value 1 field, type the name of the database instance to receive events from. Depending on the operator that you chose in the previous step, the attribute value should be the database instance name exactly as is or in a path pattern format.
      3. For the ref attribute, select the operator as Path pattern.
      4. In the Attribute value 2 field, type the path in the database instance to receive events from if data is created, updated, or deleted in that path or any of its children.

    Firebase Remote Config

    Requests to your service are triggered in response to an event when a Remote Config template is updated.

    1. From the events listed under Direct, select google.firebase.remoteconfig.remoteConfig.v1.updated.

    2. In the Region list, select global (Global).

      For more information, see Eventarc locations.

    Firebase Test Lab

    Requests to your service are triggered in response to an event when a TestMatrix has completed.

    1. From the events listed under Direct, select google.firebase.testlab.testMatrix.v1.completed.

    2. In the Region list, select global (Global).

      For more information, see Eventarc locations.

    via Cloud Audit Logs

    Requests to your service are triggered when an audit log is created that matches the trigger's filter criteria. This type of event applies to all event providers.

    1. From the events listed under via Cloud Audit Logs, select one.

    2. Select one of the following:

      • Any resource—This is the default and includes dynamically created resources that have identifiers generated at creation time.

      • Specific resource—You must provide the full resource name.

      • Path pattern—You can filter for resources using a path pattern. For example, type projects/_/buckets/eventarc-bucket/objects/random.txt or type projects/_/buckets/**/r*.txt.

    3. Select a Region.

      Cloud Audit Logs triggers for Eventarc are available in specific regions and in the global region, but are not available in dual-region and multi-region locations. To avoid any performance and data residency issues caused by a global trigger, we recommend that the location match that of the Google Cloud service that is generating events.

      If you specify the global location, you will receive events from all locations for which the event filters match. For example, by creating a global Eventarc trigger, you can receive events from resources in the EU and US multi-regions.

    For more information about capturing events that are triggered when an audit log is created that matches the trigger's filter criteria, see Determine event filters for Cloud Audit Logs.

  9. Select the Service account that invokes your Cloud Run service.

    Or, create a new service account.

    This specifies the IAM service account email associated with the trigger. For Cloud Run destinations, this service account is used to generate identity tokens when invoking the service.

  10. Optionally, specify the Service URL path to send the incoming request to.

    This is the relative path on the destination service to which the events for the trigger should be sent. For example: /, /route, route, route/subroute.

  11. After creating the trigger, verify its health by ensuring that there is a checkmark on the Triggers tab.

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