💾 Archived View for ibannieto.info › gemlog › 2022-06-17.gmi captured on 2023-06-16 at 16:20:22. Gemini links have been rewritten to link to archived content

-=-=-=-=-=-=-

ibannieto's capsule

Home

Gemlog

Creating a cgi-bin with golang

Hi ya 👋

I'm going to create a cgi-bin called "iss" with golang, only for fun.

My plan is to get the ISS coordinates and the number of people aboard.

All data is collected from OpenNotify:

OpenNotify

This is the code:

package main

import (
	"encoding/json"
	"fmt"
	"io/ioutil"
	"log"
	"net/http"
)

type Response struct {
	Message     string `json:"message"`
	Timestamp   int    `json:"timestamp"`
	IssPosition struct {
		Latitude  string `json:"latitude"`
		Longitude string `json:"longitude"`
	} `json:"iss_position"`
}

func main() {
	fmt.Println("20 text/gemini")
	fmt.Println("```")

	fmt.Println("ISS Coordinates:")
	res, err := http.Get("http://api.open-notify.org/iss-now.json")
	if err != nil {
		log.Fatal(err)
	}
	defer res.Body.Close()

	body, err := ioutil.ReadAll(res.Body)
	if err != nil {
		log.Fatal(err)
	}

	var result Response
	if err := json.Unmarshal(body, &result); err != nil { // Parse []byte to the go struct pointer
		fmt.Println("Can not unmarshal JSON")
	}

	latitude := result.IssPosition.Latitude
	longitude := result.IssPosition.Longitude

	fmt.Println("Latitude:", latitude)
	fmt.Println("Longitude:", longitude)
}

Yeah, I ken that the code is very simple and stupid but I just want to play with golang and cgi-bin files 😅

Compile and run the source code:

go build -o iss iss.go ; ./iss

In order to move the cgi to production, it's recommended to strip (delete debug info) and compress the compiled file. You'll need the upx packer:

strip ./iss ; upx ./iss

In my case the file was reduced from 4.4Mb to 1.8Mb

Try it!

International Space Station Current Location:
Latitude: -41.1457
Longitude: -22.4292

How Many People Are In Space Right Now: 10

Well, the number of people in space right now is not only aboard in the ISS but in the space 🧐 The API that I'm using returns the current number of people in space. When known it also returns the names and spacecraft those people are on.

Back

ibannieto.info CC BY-SA-4

@ Thu 17 Jun 2022 10:00:00 AM CEST