GitLab source

    You will need:

    1. An internet-accessible Kubernetes cluster with Knative Serving installed. Follow the installation instructions if you need to create one.
    2. Ensure Knative Serving is that allows GitLab to call into the cluster.
    3. If you’re using GKE, you’ll also want to assign a static IP address.
    4. Install .

    Install GitLab Event Source

    GitLab Event source lives in the . Head to the releases page, find the latest release with artifact and replace the <RELEASE> with version tag:

    Check that the manager is running:

    1. kubectl -n knative-sources get pods --selector control-plane=gitlab-controller-manager

    With the controller running you can now move on to a user persona and setup a GitLab webhook as well as a function that will consume GitLab events.

    Using the GitLab Event Source

    You are now ready to use the Event Source and trigger functions based on GitLab projects events.

    We will:

    • Create a Knative service which will receive the events. To keep things simple this service will simply dump the events to stdout, this is the so-called: event_display
    • Create a GitLab access token and a random secret token used to secure the webhooks
    • Create the event source by posting a GitLab source object manifest to Kubernetes
    1. apiVersion: serving.knative.dev/v1
    2. kind: Service
    3. metadata:
    4.   name: gitlab-event-display
    5. spec:
    6.   template:
    7.     spec:
    8.       containers:

    Create the service:

    1. kubectl -n default apply -f event-display.yaml

    Create GitLab Tokens

    1. Create a personal access token which the GitLab source will use to register webhooks with the GitLab API. The token must have an “api” access scope in order to create repository webhooks. Also decide on a secret token that your source will use to authenticate the incoming webhooks from GitLab.

    2. Update a secret values in secret.yaml defined below:

      accessToken is the personal access token created in step 1 and secretToken is any token of your choosing.

      Hint: you can generate a random secretToken with:

      secret.yaml:

      1. apiVersion: v1
      2. kind: Secret
      3. metadata:
      4.   name: gitlabsecret
      5. type: Opaque
      7.   accessToken: <personal_access_token_value>
      8.   secretToken: <random_string>
      1. kubectl -n default apply -f secret.yaml

    1. In order to receive GitLab events, you have to create a concrete Event Source for a specific namespace. Replace the projectUrl value in the gitlabsource.yaml file with your GitLab project URL, for example https://gitlab.com/knative-examples/functions.

      gitlabsource.yaml:

      1. apiVersion: sources.knative.dev/v1alpha1
      2. kind: GitLabSource
      3. metadata:
      4.   name: gitlabsource-sample
      5. spec:
      6.   eventTypes:
      7.     - push_events
      8.     - issues_events
      9.   projectUrl: <project url>
      10.   accessToken:
      11.     secretKeyRef:
      12.       key: accessToken
      13.   secretToken:
      14.     secretKeyRef:
      16.       key: secretToken
      17.   sink:
      18.     ref:
      19.       apiVersion: serving.knative.dev/v1
      20.       kind: Service
      21.       name: gitlab-event-display

    2. Apply the yaml file using kubectl:

    Verify

    Verify that GitLab webhook was created by looking at the list of webhooks under Settings » Integrations in your GitLab project. A hook should be listed that points to your Knative cluster.

    Create a push event and check the logs of the Pod backing the gitlab-event-display knative service. You will see the event:

    1. ☁️  cloudevents.Event
    2. Validation: valid
    3. Context Attributes,
    4.   specversion: 0.3
    5.   type: dev.knative.sources.gitlabsource.Push Hook
    6.   source: https://gitlab.com/<user>/<project>
    7.   id: f83c080f-c2af-48ff-8d8b-fd5b21c5938e
    8.   time: 2020-03-12T11:08:41.414572482Z
    9.   datacontenttype: application/json
    10. Data,
    11.   {
    12.    <Event payload>
    13.   }

    You can remove the GitLab webhook by deleting the GitLab source:

    1. kubectl --namespace default delete --filename gitlabsource.yaml