Initial commit

Author: iDevelopThings

RedisCache.go

@@ -0,0 +1,44 @@
+package main
+
+import (
+	"encoding/json"
+	"time"
+	
+	"github.com/go-redis/redis"
+)
+
+var Redis *redis.Client
+
+func InitRedis() {
+	Redis = redis.NewClient(&redis.Options{
+		Addr:     "localhost:6379",
+		Password: "",
+		DB:       2,
+	})
+}
+
+func Set(key string, value interface{}) error {
+	p, err := json.Marshal(value)
+	
+	if err != nil {
+		return err
+	}
+	
+	set := Redis.Set(key, p, time.Hour*6)
+	
+	if set.Err() != nil {
+		return err
+	}
+	
+	return nil
+}
+
+func Get(key string, dest interface{}) error {
+	p, err := Redis.Get(key).Result()
+	
+	if err != nil {
+		return err
+	}
+	
+	return json.Unmarshal([]byte(p), dest)
+}

UpdateCurrencyData.go

@@ -0,0 +1,101 @@
+package main
+
+import (
+	"encoding/xml"
+	"io/ioutil"
+	"net/http"
+	
+	"github.com/go-redis/redis"
+)
+
+type ecbCurrencies struct {
+	Currencies []struct {
+		Currency string  `xml:"currency,attr"`
+		Rate     float32 `xml:"rate,attr"`
+	} `xml:"Cube>Cube>Cube"`
+}
+
+type ecbUpdateDate struct {
+	Date struct {
+		Time string `xml:"time,attr"`
+	} `xml:"Cube>Cube"`
+}
+
+type CurrencyData map[string]Currency
+
+type Currency struct {
+	Currency string  `json:"currency"`
+	Rate     float32 `json:"rate"`
+}
+
+func UpdateCurrencyData() (*ecbCurrencies, *ecbUpdateDate, error) {
+	response, err := http.Get("http://www.ecb.europa.eu/stats/eurofxref/eurofxref-daily.xml")
+	if err != nil {
+		return nil, nil, err
+	}
+	
+	defer response.Body.Close()
+	
+	var currencies ecbCurrencies
+	var updateDate ecbUpdateDate
+	
+	data, err := ioutil.ReadAll(response.Body)
+	
+	if err := xml.Unmarshal(data, &currencies); err != nil {
+		return nil, nil, err
+	}
+	if err := xml.Unmarshal(data, &updateDate); err != nil {
+		return nil, nil, err
+	}
+	return &currencies, &updateDate, nil
+}
+
+func StoreCurrencies() (*CurrencyData, error) {
+	currencies, _, err := UpdateCurrencyData()
+	
+	if err != nil {
+		return nil, err
+	}
+	
+	currencyData := make(CurrencyData)
+	
+	for _, currency := range currencies.Currencies {
+		currencyData[currency.Currency] = Currency{
+			Currency: currency.Currency,
+			Rate:     currency.Rate,
+		}
+	}
+	
+	err = Set("currencies", currencyData)
+	
+	if err != nil {
+		return nil, err
+	}
+	
+	currencyData = CurrencyData{}
+	
+	err = Get("currencies", &currencyData)
+	
+	if err != nil {
+		return nil, err
+	}
+	
+	return &currencyData, nil
+}
+
+func GetOrUpdateCurrencies() (*CurrencyData, error) {
+	var currencies CurrencyData
+	
+	key := "currencies"
+	
+	if err := Get(key, &currencies); err != nil {
+		if err == redis.Nil {
+			currencies, err := StoreCurrencies()
+			
+			return currencies, err
+		}
+	}
+	
+	return &currencies, nil
+	
+}

go.mod

@@ -0,0 +1,9 @@
+module Currencies
+
+go 1.16
+
+require (
+	github.com/go-redis/redis v6.15.9+incompatible
+	github.com/gorilla/mux v1.8.0
+	github.com/onsi/gomega v1.13.0 // indirect
+)

go.sum

@@ -0,0 +1,94 @@
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main.go

@@ -0,0 +1,96 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"strings"
+	
+	"github.com/gorilla/mux"
+)
+
+type CurrencyConversion struct {
+	From     string  `json:"from"`
+	To       string  `json:"to"`
+	Rate     float32 `json:"rate"`
+	Currency string  `json:"currency"`
+}
+
+type ConversionsResponse struct {
+	Base       string                        `json:"base"`
+	Currencies map[string]CurrencyConversion `json:"currencies"`
+}
+
+func main() {
+	
+	InitRedis()
+	
+	router := mux.NewRouter()
+	
+	router.HandleFunc("/latest", CORS(Latest))
+	
+	fmt.Println("* Running on http://127.0.0.1:3000/")
+	http.ListenAndServe(":3000", router)
+}
+
+func CORS(fn http.HandlerFunc) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		if origin := r.Header.Get("Origin"); origin != "" {
+			w.Header().Set("Access-Control-Allow-Origin", origin)
+			w.Header().Set("Access-Control-Allow-Methods", "POST, GET, OPTIONS, PUT, DELETE")
+			w.Header().Set("Access-Control-Allow-Headers",
+				"Accept, Content-Type, Content-Length, Accept-Encoding, X-CSRF-Token, Authorization")
+		}
+		// Preflighted OPTIONS request
+		if r.Method == "OPTIONS" {
+			return
+		}
+		fn(w, r)
+	}
+}
+
+func Latest(w http.ResponseWriter, r *http.Request) {
+	baseParam := r.URL.Query().Get("base")
+	
+	if baseParam == "" {
+		baseParam = "EUR"
+	}
+	responseData := &ConversionsResponse{
+		Base:       baseParam,
+		Currencies: make(map[string]CurrencyConversion),
+	}
+	
+	currenciesMap, err := GetOrUpdateCurrencies()
+	
+	if err != nil {
+		http.Error(w, http.StatusText(500), 500)
+		return
+	}
+	
+	currencies := *currenciesMap
+	
+	for _, currency := range currencies {
+		baseCurrency := currencies[strings.ToUpper(baseParam)]
+		
+		if baseParam != "EUR" {
+			currency.Rate = currency.Rate / baseCurrency.Rate
+		}
+		
+		responseData.Currencies[currency.Currency] = CurrencyConversion{
+			From:     baseCurrency.Currency,
+			To:       currency.Currency,
+			Rate:     currency.Rate,
+			Currency: currency.Currency,
+		}
+	}
+	
+	response, err := json.Marshal(responseData)
+	
+	if err != nil {
+		http.Error(w, http.StatusText(500), 500)
+		return
+	}
+	
+	w.Header().Set("Content-Type", "application/json")
+	w.Write(response)
+}