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refactor exchange rates data backend, supports multi data source, supports timeout

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MaysWind
2021-01-10 01:07:37 +08:00
parent 170780a631
commit dff54fd174
9 changed files with 211 additions and 85 deletions
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pkg/models/exchange_rate.go
-59
View File
@@ -1,10 +1,5 @@
package models
import "encoding/xml"
const euroCentralBankDataSource = "European Central Bank"
const euroCentralBankBaseCurrency = "EUR"
// LatestExchangeRateResponse returns a view-object which contains latest exchange rate
type LatestExchangeRateResponse struct {
DataSource string `json:"dataSource"`
@@ -18,57 +13,3 @@ type LatestExchangeRate struct {
Currency string `json:"currency"`
Rate string `json:"rate"`
}
// EuroCentralBankExchangeRateData represents the whole data from euro central bank
type EuroCentralBankExchangeRateData struct {
XMLName xml.Name `xml:"Envelope"`
AllExchangeRates []*EuroCentralBankExchangeRates `xml:"Cube>Cube"`
}
// EuroCentralBankExchangeRates represents the exchange rates data from euro central bank
type EuroCentralBankExchangeRates struct {
Date string `xml:"time,attr"`
ExchangeRates []*EuroCentralBankExchangeRate `xml:"Cube"`
}
// EuroCentralBankExchangeRate represents the exchange rate data from euro central bank
type EuroCentralBankExchangeRate struct {
Currency string `xml:"currency,attr"`
Rate string `xml:"rate,attr"`
}
// ToLatestExchangeRateResponse returns a view-object according to original data from euro central bank
func (e EuroCentralBankExchangeRateData) ToLatestExchangeRateResponse() *LatestExchangeRateResponse {
if len(e.AllExchangeRates) < 1 {
return nil
}
latestEuroCentralBankExchangeRate := e.AllExchangeRates[0]
if len(latestEuroCentralBankExchangeRate.ExchangeRates) < 1 {
return nil
}
exchangeRates := make([]*LatestExchangeRate, len(latestEuroCentralBankExchangeRate.ExchangeRates))
for i := 0; i < len(latestEuroCentralBankExchangeRate.ExchangeRates); i++ {
exchangeRates[i] = latestEuroCentralBankExchangeRate.ExchangeRates[i].ToLatestExchangeRate()
}
latestExchangeRateResp := &LatestExchangeRateResponse{
DataSource: euroCentralBankDataSource,
Date: latestEuroCentralBankExchangeRate.Date,
BaseCurrency: euroCentralBankBaseCurrency,
ExchangeRates: exchangeRates,
}
return latestExchangeRateResp
}
// ToLatestExchangeRate returns a data pair according to original data from euro central bank
func (e EuroCentralBankExchangeRate) ToLatestExchangeRate() *LatestExchangeRate {
return &LatestExchangeRate{
Currency: e.Currency,
Rate: e.Rate,
}
}