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Integrate with Vision API

Cloud Vision API is another Machine Learning API of Google Cloud. You can use it to derive insight from your images with powerful pre-trained API models or easily train custom vision models with AutoML Vision.

In this lab, we will use a Cloud Storage bucket to store our images. Every time we add an image to the bucket, it will trigger an event to our service where we will use Vision API to analyze the image.

Cloud Storage triggered service

We're assuming that you already went through Cloud Storage triggered service tutorial and have a bucket and a CloudStorageSource already ready.

Enable Vision API

You want to make sure that the Vision API is enabled:

gcloud services enable vision.googleapis.com

Create a Vision Handler

Follow the instructions for your preferred language to create a service to handle cloud storage notifications:

Build and push Docker image

Build and push the Docker image (replace {username} with your actual DockerHub):

docker build -t {username}/vision:v1 .

docker push {username}/vision:v1

Create Vision Service

Create a Knative Vision Service defined in kservice.yaml:

kubectl apply -f kservice.yaml

Create a trigger

We need connect Vision service to the Broker.

Create a trigger.yaml.

Create the trigger:

kubectl apply -f trigger.yaml

Test the service

We can finally test our service by uploading an image to the bucket.

Drop the image to the bucket in Google Cloud Console or use gsutil to copy the file as follows:

gsutil cp ../pictures/beach.jpg gs://${BUCKET}

Wait a little and check that a pod is created:

kubectl get pods

Inspect the logs of the subscriber (replace <podid> with actual pod id):

kubectl logs <podid> -c user-container --follow

You should see something similar to this:

info: vision.Startup[0]
      Received content: {
        "kind": "storage#object",
        "id": "knative-atamel-storage/beach.jpg/1589382953998973",
        "selfLink": "https://www.googleapis.com/storage/v1/b/knative-atamel-storage/o/beach.jpg",
        "name": "beach.jpg",
        "bucket": "knative-atamel-storage",
        "generation": "1589382953998973",
        "metageneration": "1",
        "contentType": "image/jpeg",
        "timeCreated": "2020-05-13T15:15:53.998Z",
        "updated": "2020-05-13T15:15:53.998Z",
        "storageClass": "STANDARD",
        "timeStorageClassUpdated": "2020-05-13T15:15:53.998Z",
        "size": "2318021",
        "md5Hash": "zxMYWYRr3+/KjFZNxbI5dQ==",
        "mediaLink": "https://www.googleapis.com/download/storage/v1/b/knative-atamel-storage/o/beach.jpg?generation=1589382953998973&alt=media",
        "contentLanguage": "en",
        "crc32c": "OBRvYA==",
        "etag": "CP20ivOQsekCEAE="
      }
info: vision.Startup[0]
      Storage url: gs://knative-atamel-storage/beach.jpg
info: vision.Startup[0]
      This picture is labelled: Sky,Body of water,Sea,Nature,Coast,Water,Sunset