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06-core-services_faas.md

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Show Function as a Service

The goal: show Azure Function is connections with other services

Create Azure components

  1. Login to azure az login and select Subscription az account set -s $SUBSCRIPTION_ID

  2. Change working directory to: cd src/terraform/06-core-services-faas

  3. Create terraform.tfvars file. This file contains your unique properties for the rest of terraform configuration. You can use a sample generator script: ../generate_tfvars.sh

  4. Review proposed terraform configuration:

    • Event Grid
    • Storage Account Table
    • FaaS itself integrated with two above

  5. Provision Azure components via terraform

    terraform init
terraform apply

    Disclaimer: current terraform config cannot complete event-grid subscription, as it will require deployed function. Check "Deploy Function" section and then rerun terraform apply

  6. Parse terraform output to environment variables that will be picked up by azure-function locally:

export AzureWebJobsStorage=$(terraform output -raw azure_web_jobs_storage)
export eventGridTopicEndpoint=$(terraform output -raw events_topic_endpoint)
export eventGridTopicKey=$(terraform output -raw events_topic_key)
export StorageAccountConnectionString=$(terraform output -raw storage_account_connection_string)
export storageAccountTableName=$(terraform output -raw storage_account_tablename)
export FUNCTION_APP_NAME=$(terraform output -raw azure_function_name)

Deploy the function

  1. Change working directory to function sources: cd ../../az_func

  2. Create and activate virtual environment

python3 -m venv .venv
source .venv/bin/activate
pip install -r requirements.txt

  1. Deploy function to Azure: func azure functionapp publish $FUNCTION_APP_NAME --python. Note, it takes some time to finish the process.

  2. Run locally

    1. Run the application: func start --python.

    2. Insert events from another terminal: echo $(date) | xargs -I{} curl -d '{"name":"the first", "time":"{}"}' -X POST http://localhost:7071/api/HttpToEventGrid.

  3. Ingest events

# Get function code
func azure functionapp list-functions $FUNCTION_APP_NAME --show-keys

# Get function URL from previous command or from Code+Test view, for example:
FUNCTION_URL=https://cloud23-huvn-func.azurewebsites.net/api/httptoeventgrid?code=pkyeU6XDc5GH8Ig6EEcPolpkuTP447c8jG7hd8_u3Nc6AzFuiiTtjQ==
echo $(date) | xargs -I{} curl -d '{"name":"the first", "time":"{}"}' -X POST $FUNCTION_URL

  1. Review and Feedback:

    • Review setup process
    • Consider failure strategies
    • Propose mitigations: poison queue, jitter, retries

Clean up

Remove created resources: cd - && terraform destroy