service-chaining

Service chaining

In this sample, you will orchestrate multiple Cloud Functions, Cloud Run and external services in a workflow.

Cloud Function - Random number

Inside randomgen folder, deploy a function that generates a random number:

gcloud functions deploy randomgen \
    --gen2 \
    --runtime python39 \
    --trigger-http \
    --entry-point randomgen \
    --source . \
    --allow-unauthenticated

Test:

curl https://us-central1-workflows-atamel.cloudfunctions.net/randomgen

Cloud Function - Multiply

Inside multiply folder, deploy a function that multiplies a given number:

gcloud functions deploy multiply \
    --gen2 \
    --runtime python39 \
    --trigger-http \
    --entry-point multiply \
    --source . \
    --allow-unauthenticated

Test:

curl -X POST https://us-central1-workflows-atamel.cloudfunctions.net/multiply \
    -H "content-type: application/json" \
    -d '{"input":5}'

External Function - MathJS

For an external function, use MathJS.

Test:

curl https://api.mathjs.org/v4/?expr=log(56)

Cloud Run - Floor

Inside floor folder, deploy an authenticated Cloud Run service that floors a number.

Build the container:

export SERVICE_NAME=floor
gcloud builds submit --tag gcr.io/${PROJECT_ID}/${SERVICE_NAME}

Deploy:

gcloud run deploy ${SERVICE_NAME} \
  --image gcr.io/${PROJECT_ID}/${${SERVICE_NAME}} \
  --platform managed \
  --no-allow-unauthenticated

Test:

curl -X POST https://floor-wvdg6hhtla-ew.a.run.app \
    -H "content-type: application/json" \
    -d '{"input": "6.86"}'

Service account for Workflows

Create a service account for Workflows:

export SERVICE_ACCOUNT=workflows-sa
gcloud iam service-accounts create ${SERVICE_ACCOUNT}

Grant run.invoker role to the service account:

export PROJECT_ID=$(gcloud config get-value project)
gcloud projects add-iam-policy-binding ${PROJECT_ID} \
    --member "serviceAccount:${SERVICE_ACCOUNT}@${PROJECT_ID}.iam.gserviceaccount.com" \
    --role "roles/run.invoker"

Workflow

Deploy workflow:

gcloud workflows deploy workflow \
    --source=workflow.yaml \
    --service-account=${SERVICE_ACCOUNT}@${PROJECT_ID}.iam.gserviceaccount.com

Execute workflow:

gcloud workflows execute workflow

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