Add mutex

README.md

@@ -9,12 +9,13 @@ package main
 
 import (
 	"gopkg.in/kolomiichenko/cbr-currency-go.v1"
-	"log"
+	"fmt"
 )
 
 func main() {
 	cbr.updateCurrency() // force update
-	log.Println(cbr.CurrencyRates["USD"])
+	rates := cbr.GetCurrencyRates()
+	fmt.Printf("%+v\n", rates["USD"])
 }
 ```
 

main.go

@@ -6,6 +6,7 @@ import (
 	"net/http"
 	"strconv"
 	"strings"
+	"sync"
 	"time"
 
 	"golang.org/x/net/html/charset"
@@ -35,8 +36,10 @@ type currencyRate struct {
 	Value   float64
 }
 
-// CurrencyRates Global map with rates
-var CurrencyRates map[string]currencyRate
+var (
+	currencyRates map[string]currencyRate
+	mu            sync.Mutex
+)
 
 func init() {
 	UpdateCurrencyRates()
@@ -49,6 +52,11 @@ func doEvery(d time.Duration, f func()) {
 	}
 }
 
+// GetCurrencyRates Get map of rates
+func GetCurrencyRates() map[string]currencyRate {
+	return currencyRates
+}
+
 // UpdateCurrencyRates To sync rates from CBR server
 func UpdateCurrencyRates() {
 	resp, err := http.Get("http://www.cbr.ru/scripts/XML_daily.asp")
@@ -66,17 +74,21 @@ func UpdateCurrencyRates() {
 		return
 	}
 
-	CurrencyRates = make(map[string]currencyRate)
+	mu.Lock()
+
+	currencyRates = make(map[string]currencyRate)
 
 	for _, el := range data.Valute {
 		value, _ := strconv.ParseFloat(strings.Replace(el.Value, ",", ".", -1), 64)
 
-		CurrencyRates[el.CharCode] = currencyRate{
+		currencyRates[el.CharCode] = currencyRate{
 			ID:      el.ID,
 			NumCode: el.NumCode,
 			ISOCode: el.CharCode,
 			Name:    el.Name,
 			Value:   value / el.Nominal,
 		}
 	}
+
+	defer mu.Unlock()
 }