Community tutorial on golang function development

This tutorial guides you through developing and deploying community Cloud Functions using Go: setting up your project and enabling the Cloud Functions API. Write a Go function and create a file containing the code. Compile and deploy functions. Test functions using cURL. Handle errors and return appropriate response codes.

Community tutorial for Go function development

This tutorial will guide you to understand how to use the Go language to develop functions and deploy them to Community runtime environment. We'll walk through the process step by step and provide a practical case so you can experience it for yourself.

Prerequisites

• Go 1.18 or higher installed
• Google Cloud SDK installed
• Have Google Cloud account with billing enabled

Step 1: Set up a Cloud Functions project

1. Create a new Google Cloud project:

   gcloud projects create my-functions-project

2. Enable Cloud Functions API:

   gcloud services enable cloudfunctions.googleapis.com

Step 2: Write the Go function

Create A file named hello_world.go and enter the following code:

package main

import (
    "context"
    "fmt"
    "log"

    "github.com/cloudevents/sdk-go/v2/event"
)

func HelloFunction(ctx context.Context, e event.Event) error {
    msg := e.Data()
    if msg != nil {
        s := string(msg)
        log.Printf("Function invoked with data: %s", s)
        return fmt.Errorf("function failed with message: %s", s)
    }

    msg = []byte("Hello World!")
    log.Print("Function invoked without data")
    return e.Respond(200, msg, event.ResultOK)
}

Step 3: Compile and deploy the function

1. Compile your function:

   go build hello_world.go

2. Deploy your function:

   gcloud functions deploy hello_world \
   --runtime go113 \
   --entry-point HelloFunction \
   --trigger-http \
   --service-account my-service-account@my-functions-project.iam.gserviceaccount.com

Step 4: Test your function

Test your function using cURL:

curl https://<REGION>-<PROJECT_ID>.cloudfunctions.net/hello_world

You should see the response "Hello World!".

Step 5: Handling Errors

Our earlier example function returned an error when it received invalid data. We can check if the data exists by looking at the type of e.Data():

if e.Data() == nil {
    return e.Respond(400, nil, event.ResultFailedPrecondition)
}

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