Building a Serverless Function with AWS Lambda (Go Runtime)

AWS Lambda in Go

This lesson explains the main concept clearly with beginner-friendly examples and background so you can learn why the code works.

Add the AWS SDK:

$ go get github.com/aws/aws-lambda-go/lambda

package main

import (
    "context"
    "github.com/aws/aws-lambda-go/events"
    "github.com/aws/aws-lambda-go/lambda"
    "encoding/json"
)

type Response struct { Message string `json:"message"` }

func handler(ctx context.Context, req events.APIGatewayProxyRequest) (events.APIGatewayProxyResponse, error) {
    var payload map[string]string
    json.Unmarshal([]byte(req.Body), &payload)
    resp := Response{Message: "Hello, " + payload["name"]}
    body, _ := json.Marshal(resp)
    return events.APIGatewayProxyResponse{StatusCode:200, Body:string(body)}, nil
}

func main() { lambda.Start(handler) }

Build for Linux (GOOS=linux):

$ env GOOS=linux GOARCH=amd64 go build -o main main.go

Zip and upload to AWS, or use the Serverless Framework.