Written by Edd Turtle on gophercoding.com
on
(Updated: )

Example Netlify Function in Go

Netlify, the hosting and web platform, allows you to create "functions" along with their CDN. These functions are hosted on AWS’ Lambda and can be accessible via a URL. So you can create static sites, with extra ability and dynamism (like we use on this site).

We wanted to share a post giving an example how to write one of these functions in Go. The aim of the code (below) is to return the version of golang.

Setup

  1. We installed the Netlify cli to make our lives a little easier.

  2. Create our new function, we called it go-version

    1

    netlify functions:create

  3. Update the code (see below for file path and code)

  4. You can test it

    1

    netlify functions:serve

    1

    curl localhost:9999/.netlify/functions/go-version/

Example

⚡ Latest Go Version = GOVERSION

(Called dynamically through our function)

Code

In the code we setup a handler to listen for incoming requests using lambda.Start(). We’ve added the getLatestVer() to then get the data to return.

.netlify/functions/go-version/main.go

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42

package main

import (
    "context"
    "io/ioutil"
    "net/http"
    "strconv"

    "github.com/aws/aws-lambda-go/events"
    "github.com/aws/aws-lambda-go/lambda"
)

func handler(ctx context.Context, request events.APIGatewayProxyRequest) (*events.APIGatewayProxyResponse, error) {
    version := getLatestVer()
    return &events.APIGatewayProxyResponse{
        StatusCode: 200,
        Headers: map[string]string{
            "Content-Type":   "text/plain",
            "Content-Length": strconv.FormatInt(int64(len(version)), 10),
            "Cache-Control":  "public, max-age=86400",
        },
        Body:            version,
        IsBase64Encoded: false,
    }, nil
}

func getLatestVer() string {
    version := "?"
    resp, err := http.Get("https://go.dev/VERSION?m=text")
    if err != nil {
        return version
    }
    resBody, err := ioutil.ReadAll(resp.Body)
    if err != nil {
        return version
    }
    return string(resBody)
}

func main() {
    lambda.Start(handler)
}
#netlify#function#aws#lambda#cli#serverless#gateway#static
Author Edd Turtle

Edd is a PHP and Go developer who enjoys blogging about his experiences, mostly about creating and coding new things he's working on and is a big beliver in open-source and Linux.

Tweet me! ☕   Buy me a Coffee