MaysWind
104 lines
3.7 KiB
Go
104 lines
3.7 KiB
Go
package exchangerates
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import (
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"encoding/xml"
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"github.com/mayswind/lab/pkg/core"
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"github.com/mayswind/lab/pkg/errs"
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"github.com/mayswind/lab/pkg/log"
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"github.com/mayswind/lab/pkg/models"
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)
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const euroCentralBankExchangeRateUrl = "https://www.ecb.europa.eu/stats/eurofxref/eurofxref-daily.xml"
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const euroCentralBankDataSource = "European Central Bank"
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const euroCentralBankBaseCurrency = "EUR"
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// EuroCentralBankDataSource defines the structure of exchange rates data source of euro central bank
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type EuroCentralBankDataSource struct {
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ExchangeRatesDataSource
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}
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// EuroCentralBankExchangeRateData represents the whole data from euro central bank
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type EuroCentralBankExchangeRateData struct {
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XMLName xml.Name `xml:"Envelope"`
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AllExchangeRates []*EuroCentralBankExchangeRates `xml:"Cube>Cube"`
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}
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// EuroCentralBankExchangeRates represents the exchange rates data from euro central bank
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type EuroCentralBankExchangeRates struct {
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Date string `xml:"time,attr"`
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ExchangeRates []*EuroCentralBankExchangeRate `xml:"Cube"`
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}
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// EuroCentralBankExchangeRate represents the exchange rate data from euro central bank
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type EuroCentralBankExchangeRate struct {
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Currency string `xml:"currency,attr"`
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Rate string `xml:"rate,attr"`
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}
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// ToLatestExchangeRateResponse returns a view-object according to original data from euro central bank
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func (e *EuroCentralBankExchangeRateData) ToLatestExchangeRateResponse() *models.LatestExchangeRateResponse {
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if len(e.AllExchangeRates) < 1 {
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return nil
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}
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latestEuroCentralBankExchangeRate := e.AllExchangeRates[0]
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if len(latestEuroCentralBankExchangeRate.ExchangeRates) < 1 {
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return nil
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}
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exchangeRates := make([]*models.LatestExchangeRate, len(latestEuroCentralBankExchangeRate.ExchangeRates))
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for i := 0; i < len(latestEuroCentralBankExchangeRate.ExchangeRates); i++ {
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exchangeRates[i] = latestEuroCentralBankExchangeRate.ExchangeRates[i].ToLatestExchangeRate()
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}
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latestExchangeRateResp := &models.LatestExchangeRateResponse{
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DataSource: euroCentralBankDataSource,
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Date: latestEuroCentralBankExchangeRate.Date,
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BaseCurrency: euroCentralBankBaseCurrency,
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ExchangeRates: exchangeRates,
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}
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return latestExchangeRateResp
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}
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// ToLatestExchangeRate returns a data pair according to original data from euro central bank
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func (e *EuroCentralBankExchangeRate) ToLatestExchangeRate() *models.LatestExchangeRate {
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return &models.LatestExchangeRate{
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Currency: e.Currency,
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Rate: e.Rate,
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}
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}
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// GetRequestUrl returns the euro central bank data source url
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func (e *EuroCentralBankDataSource) GetRequestUrl() string {
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return euroCentralBankExchangeRateUrl
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}
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// Parse returns the common response entity according to the euro central bank data source raw response
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func (e *EuroCentralBankDataSource) Parse(c *core.Context, content []byte) (*models.LatestExchangeRateResponse, error) {
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euroCentralBankData := &EuroCentralBankExchangeRateData{}
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err := xml.Unmarshal(content, euroCentralBankData)
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if err != nil {
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log.ErrorfWithRequestId(c, "[euro_central_bank_datasource.Parse] failed to parse xml data, content is %s, because %s", string(content), err.Error())
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return nil, errs.ErrFailedToRequestRemoteApi
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}
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latestExchangeRateResponse := euroCentralBankData.ToLatestExchangeRateResponse()
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if latestExchangeRateResponse == nil {
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log.ErrorfWithRequestId(c, "[euro_central_bank_datasource.Parse] failed to parse latest exchange rate data, content is %s", string(content))
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return nil, errs.ErrFailedToRequestRemoteApi
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}
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latestExchangeRateResponse.ExchangeRates = append(latestExchangeRateResponse.ExchangeRates, &models.LatestExchangeRate{
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Currency: euroCentralBankBaseCurrency,
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Rate: "1",
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})
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return latestExchangeRateResponse, nil
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}
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