Creating simplest API in GO

Download and Install Go

https://golang.org/dl/

Directory Structure

Create a folder 'go' at your home directory as $HOME/go is the default $GOPATH. Create 'src' and 'bin' directory within 'go' directory. Packages reside inside 'src' directory.

Now, run the follwoing command to get this project with all dependency packages:

go get github.com/shoeb240/first-go-api

OR

Create the following directory structure within $HOME/go directory:

bin/
src/
    github.com/shoeb240/	

cd to src/github.com/shoeb240/ and clone this project from github with the following git command:

git clone http://github.com/shoeb240/first-go-api

To download Gorilla Mux pacjake run the following command:

go get github.com/gorilla/mux

Now, you will have the following directory structure:

bin/
src/
    github.com/gorilla/
	    mux/
    github.com/shoeb240/
	    first-go-api/
	        main.go               # command source
	        route.go               
	        handlers.go               

route.go

Creating api route '/users' and opening port 8081 to listen to request using gorilla mux

package main

import (
    "github.com/gorilla/mux"
    "net/http"
)

func RequestHandle() {
    myRouter := mux.NewRouter()
    myRouter.HandleFunc("/users", getUsers).Methods("GET")

    http.ListenAndServe(":8081", myRouter)
}

handlers.go

Creating getUsers handler method to respond to the route

package main

import (
    "fmt"
    "net/http"
)

func getUsers(w http.ResponseWriter, r *http.Request) {
    fmt.Fprintf(w, "Showing users list")
}

main.go

Calling RequestHandle() from main

package main

import (
    "fmt"
)

func main(){
    fmt.Println("Waiting for request to serve...")
    RequestHandle()
}

Run the following command

go run github.com/shoeb240/first-go-api

It will output

Waiting for request to serve...

Open your browser to open url 'localhost:8081/users'. It will show..

I am responding to your API call