add the Central Bank of the Republic of Uzbekistan exchange rates data source

pkg/exchangerates/central_bank_of_uzbekistan_datasource.go

@@ -0,0 +1,163 @@
+package exchangerates
+
+import (
+	"encoding/json"
+	"math"
+	"net/http"
+	"time"
+
+	"github.com/mayswind/ezbookkeeping/pkg/core"
+	"github.com/mayswind/ezbookkeeping/pkg/errs"
+	"github.com/mayswind/ezbookkeeping/pkg/log"
+	"github.com/mayswind/ezbookkeeping/pkg/models"
+	"github.com/mayswind/ezbookkeeping/pkg/utils"
+	"github.com/mayswind/ezbookkeeping/pkg/validators"
+)
+
+const centralBankOfUzbekistanExchangeRateUrl = "https://cbu.uz/ru/arkhiv-kursov-valyut/json/"
+const centralBankOfUzbekistanExchangeRateReferenceUrl = "https://cbu.uz/en/arkhiv-kursov-valyut/"
+const centralBankOfUzbekistanDataSource = "O‘zbekiston Respublikasi Markaziy banki"
+const centralBankOfUzbekistanBaseCurrency = "UZS"
+
+const centralBankOfUzbekistanUpdateDateFormat = "02.01.2006"
+const centralBankOfUzbekistanUpdateDateTimezone = "Asia/Samarkand"
+
+// CentralBankOfUzbekistanDataSource defines the structure of exchange rates data source of the central bank of the Republic of Uzbekistan
+type CentralBankOfUzbekistanDataSource struct {
+	ExchangeRatesDataSource
+}
+
+// CentralBankOfUzbekistanExchangeRates represents the exchange rates data from the central bank of the Republic of Uzbekistan
+type CentralBankOfUzbekistanExchangeRates []*CentralBankOfUzbekistanExchangeRate
+
+// CentralBankOfUzbekistanExchangeRate represents the exchange rate data from the central bank of the Republic of Uzbekistan
+type CentralBankOfUzbekistanExchangeRate struct {
+	Currency string `json:"Ccy"`
+	Unit     string `json:"Nominal"`
+	Rate     string `json:"Rate"`
+	Date     string `json:"Date"`
+}
+
+// ToLatestExchangeRateResponse returns a view-object according to original data from the central bank of the Republic of Uzbekistan
+func (e CentralBankOfUzbekistanExchangeRates) ToLatestExchangeRateResponse(c core.Context) *models.LatestExchangeRateResponse {
+	if len(e) < 1 {
+		log.Errorf(c, "[central_bank_of_uzbekistan_datasource.ToLatestExchangeRateResponse] exchange rates is empty")
+		return nil
+	}
+
+	timezone, err := time.LoadLocation(centralBankOfUzbekistanUpdateDateTimezone)
+
+	if err != nil {
+		log.Errorf(c, "[central_bank_of_uzbekistan_datasource.ToLatestExchangeRateResponse] failed to get timezone, timezone name is %s", danmarksNationalbankDataUpdateDateTimezone)
+		return nil
+	}
+
+	exchangeRates := make(models.LatestExchangeRateSlice, 0, len(e))
+	latestUpdateTime := int64(0)
+
+	for i := 0; i < len(e); i++ {
+		exchangeRate := e[i]
+
+		if _, exists := validators.AllCurrencyNames[exchangeRate.Currency]; !exists {
+			continue
+		}
+
+		updateTime, err := time.ParseInLocation(centralBankOfUzbekistanUpdateDateFormat, exchangeRate.Date, timezone)
+
+		if err != nil {
+			log.Errorf(c, "[central_bank_of_uzbekistan_datasource.ToLatestExchangeRateResponse] failed to parse update date, datetime is %s", exchangeRate.Date)
+			return nil
+		}
+
+		if updateTime.Unix() > latestUpdateTime {
+			latestUpdateTime = updateTime.Unix()
+		}
+
+		finalExchangeRate := exchangeRate.ToLatestExchangeRate(c)
+
+		if finalExchangeRate == nil {
+			continue
+		}
+
+		exchangeRates = append(exchangeRates, finalExchangeRate)
+	}
+
+	latestExchangeRateResp := &models.LatestExchangeRateResponse{
+		DataSource:    centralBankOfUzbekistanDataSource,
+		ReferenceUrl:  centralBankOfUzbekistanExchangeRateReferenceUrl,
+		UpdateTime:    latestUpdateTime,
+		BaseCurrency:  centralBankOfUzbekistanBaseCurrency,
+		ExchangeRates: exchangeRates,
+	}
+
+	return latestExchangeRateResp
+}
+
+// ToLatestExchangeRate returns a data pair according to original data from the central bank of the Republic of Uzbekistan
+func (e *CentralBankOfUzbekistanExchangeRate) ToLatestExchangeRate(c core.Context) *models.LatestExchangeRate {
+	rate, err := utils.StringToFloat64(e.Rate)
+
+	if err != nil {
+		log.Warnf(c, "[central_bank_of_uzbekistan_datasource.ToLatestExchangeRate] failed to parse rate, currency is %s, rate is %s", e.Currency, e.Rate)
+		return nil
+	}
+
+	if rate <= 0 {
+		log.Warnf(c, "[central_bank_of_uzbekistan_datasource.ToLatestExchangeRate] rate is invalid, currency is %s, rate is %s", e.Currency, e.Rate)
+		return nil
+	}
+
+	unit, err := utils.StringToFloat64(e.Unit)
+
+	if err != nil {
+		log.Warnf(c, "[central_bank_of_uzbekistan_datasource.ToLatestExchangeRate] failed to parse unit, currency is %s, unit is %s", e.Currency, e.Unit)
+		return nil
+	}
+
+	if unit <= 0 {
+		log.Warnf(c, "[central_bank_of_uzbekistan_datasource.ToLatestExchangeRate] unit is less or equal zero, currency is %s, unit is %s", e.Currency, e.Unit)
+		return nil
+	}
+
+	finalRate := 1000 * unit / rate
+
+	if math.IsInf(finalRate, 0) {
+		return nil
+	}
+
+	return &models.LatestExchangeRate{
+		Currency: e.Currency,
+		Rate:     utils.Float64ToString(finalRate),
+	}
+}
+
+// BuildRequests returns the the central bank of the Republic of Uzbekistan exchange rates http requests
+func (e *CentralBankOfUzbekistanDataSource) BuildRequests() ([]*http.Request, error) {
+	req, err := http.NewRequest("GET", centralBankOfUzbekistanExchangeRateUrl, nil)
+
+	if err != nil {
+		return nil, err
+	}
+
+	return []*http.Request{req}, nil
+}
+
+// Parse returns the common response entity according to the the central bank of the Republic of Uzbekistan data source raw response
+func (e *CentralBankOfUzbekistanDataSource) Parse(c core.Context, content []byte) (*models.LatestExchangeRateResponse, error) {
+	centralBankOfUzbekistanData := &CentralBankOfUzbekistanExchangeRates{}
+	err := json.Unmarshal(content, centralBankOfUzbekistanData)
+
+	if err != nil {
+		log.Errorf(c, "[central_bank_of_uzbekistan_datasource.Parse] failed to parse xml data, content is %s, because %s", string(content), err.Error())
+		return nil, errs.ErrFailedToRequestRemoteApi
+	}
+
+	latestExchangeRateResponse := centralBankOfUzbekistanData.ToLatestExchangeRateResponse(c)
+
+	if latestExchangeRateResponse == nil {
+		log.Errorf(c, "[central_bank_of_uzbekistan_datasource.Parse] failed to parse latest exchange rate data, content is %s", string(content))
+		return nil, errs.ErrFailedToRequestRemoteApi
+	}
+
+	return latestExchangeRateResponse, nil
+}

pkg/exchangerates/central_bank_of_uzbekistan_datasource_test.go

@@ -0,0 +1,145 @@
+package exchangerates
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+
+	"github.com/mayswind/ezbookkeeping/pkg/core"
+	"github.com/mayswind/ezbookkeeping/pkg/models"
+)
+
+const centralBankOfUzbekistanMinimumRequiredContent = "[\n" +
+	"  {\n" +
+	"    \"Ccy\": \"USD\",\n" +
+	"    \"Nominal\": \"1\",\n" +
+	"    \"Rate\": \"12800.13\",\n" +
+	"    \"Date\": \"15.11.2024\"\n" +
+	"  },\n" +
+	"  {\n" +
+	"    \"Ccy\": \"VND\",\n" +
+	"    \"Nominal\": \"10\",\n" +
+	"    \"Rate\": \"5.04\",\n" +
+	"    \"Date\": \"15.11.2024\"\n" +
+	"  }\n" +
+	"]"
+
+func TestCentralBankOfUzbekistanDataSource_StandardDataExtractBaseCurrency(t *testing.T) {
+	dataSource := &CentralBankOfUzbekistanDataSource{}
+	context := core.NewNullContext()
+
+	actualLatestExchangeRateResponse, err := dataSource.Parse(context, []byte(centralBankOfUzbekistanMinimumRequiredContent))
+	assert.Equal(t, nil, err)
+	assert.Equal(t, "UZS", actualLatestExchangeRateResponse.BaseCurrency)
+}
+
+func TestCentralBankOfUzbekistanDataSource_StandardDataExtractUpdateTime(t *testing.T) {
+	dataSource := &CentralBankOfUzbekistanDataSource{}
+	context := core.NewNullContext()
+
+	actualLatestExchangeRateResponse, err := dataSource.Parse(context, []byte(centralBankOfUzbekistanMinimumRequiredContent))
+	assert.Equal(t, nil, err)
+	assert.Equal(t, int64(1731610800), actualLatestExchangeRateResponse.UpdateTime)
+}
+
+func TestCentralBankOfUzbekistanDataSource_StandardDataExtractExchangeRates(t *testing.T) {
+	dataSource := &CentralBankOfUzbekistanDataSource{}
+	context := core.NewNullContext()
+
+	actualLatestExchangeRateResponse, err := dataSource.Parse(context, []byte(centralBankOfUzbekistanMinimumRequiredContent))
+	assert.Equal(t, nil, err)
+	assert.Contains(t, actualLatestExchangeRateResponse.ExchangeRates, &models.LatestExchangeRate{
+		Currency: "USD",
+		Rate:     "0.07812420655102723",
+	})
+	assert.Contains(t, actualLatestExchangeRateResponse.ExchangeRates, &models.LatestExchangeRate{
+		Currency: "VND",
+		Rate:     "1984.126984126984",
+	})
+}
+
+func TestCentralBankOfUzbekistanDataSource_BlankContent(t *testing.T) {
+	dataSource := &CentralBankOfUzbekistanDataSource{}
+	context := core.NewNullContext()
+
+	_, err := dataSource.Parse(context, []byte(""))
+	assert.NotEqual(t, nil, err)
+}
+
+func TestCentralBankOfUzbekistanDataSource_EmptyData(t *testing.T) {
+	dataSource := &CentralBankOfUzbekistanDataSource{}
+	context := core.NewNullContext()
+
+	_, err := dataSource.Parse(context, []byte("[]"))
+	assert.NotEqual(t, nil, err)
+}
+
+func TestCentralBankOfUzbekistanDataSource_InvalidCurrency(t *testing.T) {
+	dataSource := &CentralBankOfUzbekistanDataSource{}
+	context := core.NewNullContext()
+
+	actualLatestExchangeRateResponse, err := dataSource.Parse(context, []byte("[\n"+
+		"  {\n"+
+		"    \"Ccy\": \"XXX\",\n"+
+		"    \"Nominal\": \"1\",\n"+
+		"    \"Rate\": \"1\",\n"+
+		"    \"Date\": \"15.11.2024\"\n"+
+		"  }\n"+
+		"]"))
+	assert.Equal(t, nil, err)
+	assert.Len(t, actualLatestExchangeRateResponse.ExchangeRates, 0)
+}
+
+func TestCentralBankOfUzbekistanDataSource_InvalidNominal(t *testing.T) {
+	dataSource := &CentralBankOfUzbekistanDataSource{}
+	context := core.NewNullContext()
+
+	actualLatestExchangeRateResponse, err := dataSource.Parse(context, []byte("[\n"+
+		"  {\n"+
+		"    \"Ccy\": \"USD\",\n"+
+		"    \"Nominal\": null,\n"+
+		"    \"Rate\": \"12800.13\",\n"+
+		"    \"Date\": \"15.11.2024\"\n"+
+		"  }\n"+
+		"]"))
+	assert.Equal(t, nil, err)
+	assert.Len(t, actualLatestExchangeRateResponse.ExchangeRates, 0)
+
+	actualLatestExchangeRateResponse, err = dataSource.Parse(context, []byte("[\n"+
+		"  {\n"+
+		"    \"Ccy\": \"USD\",\n"+
+		"    \"Nominal\": \"0\",\n"+
+		"    \"Rate\": \"12800.13\",\n"+
+		"    \"Date\": \"15.11.2024\"\n"+
+		"  }\n"+
+		"]"))
+	assert.Equal(t, nil, err)
+	assert.Len(t, actualLatestExchangeRateResponse.ExchangeRates, 0)
+}
+
+func TestCentralBankOfUzbekistanDataSource_InvalidRate(t *testing.T) {
+	dataSource := &CentralBankOfUzbekistanDataSource{}
+	context := core.NewNullContext()
+
+	actualLatestExchangeRateResponse, err := dataSource.Parse(context, []byte("[\n"+
+		"  {\n"+
+		"    \"Ccy\": \"USD\",\n"+
+		"    \"Nominal\": \"1\",\n"+
+		"    \"Rate\": null,\n"+
+		"    \"Date\": \"15.11.2024\"\n"+
+		"  }\n"+
+		"]"))
+	assert.Equal(t, nil, err)
+	assert.Len(t, actualLatestExchangeRateResponse.ExchangeRates, 0)
+
+	actualLatestExchangeRateResponse, err = dataSource.Parse(context, []byte("[\n"+
+		"  {\n"+
+		"    \"Ccy\": \"USD\",\n"+
+		"    \"Nominal\": \"1\",\n"+
+		"    \"Rate\": \"0\",\n"+
+		"    \"Date\": \"15.11.2024\"\n"+
+		"  }\n"+
+		"]"))
+	assert.Equal(t, nil, err)
+	assert.Len(t, actualLatestExchangeRateResponse.ExchangeRates, 0)
+}

pkg/exchangerates/exchange_rates_datasource_container.go

@@ -59,6 +59,9 @@ func InitializeExchangeRatesDataSource(config *settings.Config) error {
 	} else if config.ExchangeRatesDataSource == settings.SwissNationalBankDataSource {
 		Container.Current = &SwissNationalBankDataSource{}
 		return nil
+	} else if config.ExchangeRatesDataSource == settings.CentralBankOfUzbekistanDataSource {
+		Container.Current = &CentralBankOfUzbekistanDataSource{}
+		return nil
 	} else if config.ExchangeRatesDataSource == settings.InternationalMonetaryFundDataSource {
 		Container.Current = &InternationalMonetaryFundDataSource{}
 		return nil