Display Bitcoin prices of 4 major exchange in BTC/JPY on Bitbar

bitcoin.go

// Display Bitcoin prices of 4 major exchange in BTC/JPY on Bitbar

package main

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

func getJSON(url string) []byte {
	resp, _ := http.Get(url)
	defer resp.Body.Close()
	byteArray, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		log.Print(err)
		return nil
	}
	return byteArray
}

func zaif(ch chan string) {
	byteArray := getJSON("https://api.zaif.jp/api/1/ticker/btc_jpy")
	var j struct {
		Bid float32 `json:"bid"`
		Ask float32 `json:"ask"`
	}
	if err := json.Unmarshal(byteArray, &j); err != nil {
		log.Print(err)
		return
	}
	ch <- fmt.Sprintf("Zaif     bid: %d, ask: %d", int(j.Bid), int(j.Ask))
}

func bitflyer(ch chan string) {
	byteArray := getJSON("https://api.bitflyer.jp/v1/ticker?product_code=BTC_JPY")
	var j struct {
		Bid float32 `json:"best_bid"`
		Ask float32 `json:"best_ask"`
	}

	if err := json.Unmarshal(byteArray, &j); err != nil {
		log.Print(err)
		return
	}
	ch <- fmt.Sprintf("Bitflyer bid: %d, ask: %d", int(j.Bid), int(j.Ask))
}

func btcbox(ch chan string) {
	byteArray := getJSON("https://www.btcbox.co.jp/api/v1/ticker/")
	var j struct {
		Bid float32 `json:"buy"`
		Ask float32 `json:"sell"`
	}
	if err := json.Unmarshal(byteArray, &j); err != nil {
		log.Print(err)
		return
	}
	ch <- fmt.Sprintf("BTCBOX   bid: %d, ask: %d", int(j.Bid), int(j.Ask))
}

func quoine(ch chan string) {
	byteArray := getJSON("https://api.quoine.com/products/5")
	var j struct {
		Bid float32 `json:"market_bid"`
		Ask float32 `json:"market_ask"`
	}
	if err := json.Unmarshal(byteArray, &j); err != nil {
		log.Print(err)
		return
	}
	ch <- fmt.Sprintf("Quoine   bid: %d, ask: %d", int(j.Bid), int(j.Ask))
}

func main() {
	fmt.Println("💲")
	fmt.Println("---")

	ch := make(chan string)
	go bitflyer(ch)
	go zaif(ch)
	go btcbox(ch)
	go quoine(ch)

	for i := 0; i < 4; i++ {
		fmt.Println(<-ch)
	}
}