Getting Started with Go

This tutorial will teach you how to build a “Hello, World!” chute using Go.


Make sure you have Go installed as well as ParaDrop pdtools (v0.9.2 or newer).

pip install pdtools>=0.9.2

Set up

Make a new directory.

mkdir go-hello-world
cd go-hello-world

Create a chute configuration

Use the pdtools interactive init command to create a paradrop.yaml file for your chute.

python -m pdtools chute init

Use the following values as suggested responses to the prompts. If you have a different version of pdtools installed, the prompts may be slightly different.

name: go-hello-world
description: Hello World chute for ParaDrop using Go.
type: light
image: go
command: app

The end result should be a paradrop.yaml file similar to the following.

command: app
config: {}
description: Hello World chute for ParaDrop using Go.
name: go-hello-world
type: light
use: go
version: 1

Develop the Application

Create a file name main.go with the following code.

package main

import (

func GetIndex(w http.ResponseWriter, r *http.Request) {
    fmt.Fprintf(w, "Hello, World!\n")

func main() {
    fmt.Println("Listening on :8000")
    http.HandleFunc("/", GetIndex)
    http.ListenAndServe(":8000", nil)

Run the application locally with the following command.

go run main.go

Then load http://localhost:8000/ in a web browser to see the result.

Wrap Up

The web server in this application listens on port 8000. We need to include that information in the paradrop.yaml file as well. Use the following command to alter the configuration file.

python -m pdtools chute set config.web.port 8000