Console ticker for btc china

btccny.go

package main

import (
	"encoding/json"
	"fmt"
	"github.com/kylelemons/godebug/pretty"
	"io/ioutil"
	"net/http"
	"strconv"
	"time"
)

type MarketData struct {
	Ticker struct {
		Ask    f64 `json:"sell"`
		Bid    f64 `json:"buy"`
		Last   f64 `json:"last"`
		Volume f64 `json:"vol"`
		High   f64 `json:"high"`
		Low    f64 `json:"low"`
	}
}

type f64 float64

func (f *f64) UnmarshalJSON(data []byte) (err error) {
	var float float64
	// Trim the qoutes off the supplied data and parse it as a float64
	float, err = strconv.ParseFloat(string(data[1:len(data)-1]), 64)
	if err != nil {
		return
	}

	// Set the field to the float64 value
	*f = f64(float)
	return
}

var url = "https://data.btcchina.com/data/ticker"

func main() {
	tr := &http.Transport{}
	client := &http.Client{Transport: tr}
	req, _ := http.NewRequest("GET", url, nil)
	req.Header.Set("Connection", "Keep-Alive")
	var data MarketData
	var newData MarketData
	var i int64
	i = 0
	for {
		if i%10 == 0 {
			fmt.Println("  LAST  |   BID   |   ASK   ")
		}
		res, err := client.Do(req)
		if err != nil {
			fmt.Println(err)
			return
		}
		jsonData, err := ioutil.ReadAll(res.Body)
		res.Body.Close()
		if err != nil {
			fmt.Println(err)
			return
		}
		err = json.Unmarshal(jsonData, &newData)

		if err != nil {
			fmt.Println(err)
			return
		}
		if newData != data {
			d := newData.Ticker
			fmt.Printf("%5.2f | %5.2f | %5.2f\n", d.Last, d.Bid, d.Ask)
			i++
		}
		data = newData
		time.Sleep(1 * time.Second)
	}
}
func junk() {
	pretty.Print("")
}