util.go

package coinmarketcap

import (
	"fmt"
	"io/ioutil"
	"net/http"
	"strconv"
	"strings"
	"time"
)

// toInt helper for parsing strings to int
func toInt(rawInt string) int {
	parsed, _ := strconv.Atoi(strings.Replace(strings.Replace(rawInt, "$", "", -1), ",", "", -1))
	return parsed
}

// toFloat helper for parsing strings to float
func toFloat(rawFloat string) float64 {
	parsed, _ := strconv.ParseFloat(strings.Replace(strings.Replace(strings.Replace(rawFloat, "$", "", -1), ",", "", -1), "%", "", -1), 64)
	return parsed
}

// doReq HTTP client
func doReq(req *http.Request) ([]byte, error) {
	requestTimeout := time.Duration(5 * time.Second)
	client := &http.Client{
		Timeout: requestTimeout,
	}
	resp, err := client.Do(req)
	if err != nil {
		return nil, err
	}
	defer resp.Body.Close()
	body, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		return nil, err
	}
	if 200 != resp.StatusCode {
		return nil, fmt.Errorf("%s", body)
	}

	return body, nil
}

// makeReq HTTP request helper
func (s *Client) makeReq(url string) ([]byte, error) {
	req, err := http.NewRequest("GET", url, nil)
	if err != nil {
		return nil, err
	}
	req.Header.Add("X-CMC_PRO_API_KEY", s.proAPIKey)
	resp, err := doReq(req)
	if err != nil {
		return nil, err
	}

	return resp, err
}