coincheck_market_price.10s.go http://hitoriblog.com/?p=50182

coincheck_market_price.10s.go

package main

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

// Rate json struct
type Rate struct {
	Rate string `json:"rate"`
}

var jsonFile = os.Getenv("HOME") + "/coincheck.json"

func init() {
	// os.Setenv("HTTP_PROXY", "http://192.168.0.2:3128")
}

func putsMenu() {
	fmt.Println("---")

	fmt.Println("ビットコイン(Bitcoin)価格チャート 5分足 | href=https://coincheck.com/ja/exchange/charts/coincheck/btc_jpy/300")
	fmt.Println("ビットコイン(Bitcoin)価格チャート 15分足 | href=https://coincheck.com/ja/exchange/charts/coincheck/btc_jpy/900")
	fmt.Println("ビットコイン(Bitcoin)価格チャート 1時間足 | href=https://coincheck.com/ja/exchange/charts/coincheck/btc_jpy/3600")
	fmt.Println("ビットコイン(Bitcoin)価格チャート 4時間足 | href=https://coincheck.com/ja/exchange/charts/coincheck/btc_jpy/14400")
	fmt.Println("ビットコイン(Bitcoin)価格チャート 24時間足 | href=https://coincheck.com/ja/exchange/charts/coincheck/btc_jpy/86400")
}

func main() {
	color := "black"
	diff := "0.0"

	resp, err := http.Get("https://coincheck.com/api/rate/btc_jpy")
	defer resp.Body.Close()
	if err != nil {
		panic(err)
	}

	jsonData, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		panic(err)
	}

	var rate Rate
	if err := json.Unmarshal(jsonData, &rate); err != nil {
		panic(err)
	}
	current, _ := strconv.ParseFloat(rate.Rate, 64)
	if _, err := os.Stat(jsonFile); err == nil {
		var previousRate Rate
		j, err := ioutil.ReadFile(jsonFile)
		if err != nil {
			panic(err)
		}
		if err := json.Unmarshal(j, &previousRate); err != nil {
			panic(err)
		}
		previous, _ := strconv.ParseFloat(previousRate.Rate, 64)
		if d := current - previous; d > 0 {
			color = "green"
			diff = fmt.Sprintf("+%.01f", d)
		} else if d < 0 {
			color = "red"
			diff = fmt.Sprintf("%.01f", d)
		}
	}
	ioutil.WriteFile(jsonFile, jsonData, os.ModePerm)
	fmt.Printf("%.01f (%s) | color=%s\n", current, diff, color)
	putsMenu()
}