crude golang gitcoin miner for https://github.com/worace/git-coin

miner.go

package main

import (
	"bytes"
	"crypto/sha1"
	"encoding/hex"
	"fmt"
	"io/ioutil"
	"math/rand"
	"net/http"
	"net/url"
)

const baseUrl string = "http://git-coin.herokuapp.com"

func gcUrl(path string) string {
	return fmt.Sprintf("%s%s", baseUrl, path)
}

func newMessage() string {
	return fmt.Sprintf("%d", rand.Int())
}

func submit(message string) {
}

func digest(input string) []byte {
	h := sha1.New()
	h.Write([]byte(input))
	return h.Sum(nil)
}

func fetchTarget() []byte {
	resp, err := http.Get(gcUrl("/target"))
	if err != nil {
		panic("Couldn't fetch target")
	}

	target, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		panic("error reading response body")
	}
	defer resp.Body.Close()
	return target
}

func submitMessage(message string) (resp *http.Response, err error) {
	return http.PostForm(gcUrl("/hash"), url.Values{"owner": {"worace"}, "message": {message}})
}

func main() {
	currentTarget := fetchTarget()
	for {
		input := newMessage()
		output := digest(input)

		targetBytes, _ := hex.DecodeString(string(currentTarget))

		//targetString := fmt.Sprintf("%x", currentTarget)
		//outputString := fmt.Sprintf("%x", hex.EncodeToString(output))

		//fmt.Println(targetBytes)
		//fmt.Println(output)
		if bytes.Compare(output, targetBytes) < 0 {
			fmt.Println("congrats got a hash!")
			resp, err := submitMessage(input)
			if err != nil {
				panic("failed to submit guess")
			}

			defer resp.Body.Close()
			body, err := ioutil.ReadAll(resp.Body)
			if err != nil {
				panic("error reading response body")
			}
			fmt.Println(string(body))
			currentTarget = fetchTarget()
		} else {
			fmt.Println("target still smaller, keep searching")
		}
	}

}