get coin price usd helper

coinmarketcap.go

@@ -35,6 +35,7 @@ func GetMarketData() (GlobalMarketData, error) {
 
 // GetCoinData get information about a crypto currency
 func GetCoinData(coin string) (Coin, error) {
+	coin = strings.ToLower(coin)
 	url = fmt.Sprintf("%s/ticker/%s", baseURL, coin)
 	resp, err := makeReq(url)
 	if err != nil {
@@ -89,6 +90,15 @@ func GetCoinGraphData(coin string, start int64, end int64) (CoinGraph, error) {
 	return data, nil
 }
 
+// GetCoinPriceUsd get USD price of crypto currency
+func GetCoinPriceUsd(coin string) (float64, error) {
+	data, err := GetCoinData(coin)
+	if err != nil {
+		return float64(0), nil
+	}
+	return data.PriceUsd, nil
+}
+
 // CoinMarkets get market data for a coin name.
 func CoinMarkets(coin string) ([]Market, error) {
 	url := fmt.Sprintf("https://coinmarketcap.com/currencies/%s/#markets", coin)

coinmarketcap_test.go

@@ -1,6 +1,8 @@
 package coinmarketcap
 
-import "testing"
+import (
+	"testing"
+)
 
 func TestGetMarketData(t *testing.T) {
 
@@ -18,6 +20,16 @@ func TestGetCoinGraphData(t *testing.T) {
 
 }
 
+func TestGetCoinPriceUsd(t *testing.T) {
+	price, err := GetCoinPriceUsd("ethereum")
+	if err != nil {
+		t.FailNow()
+	}
+	if price <= 0 {
+		t.FailNow()
+	}
+}
+
 func TestCoinMarkets(t *testing.T) {
 
 }