private async Task <List <Rate> > GetUsdRatesForDateAsync(DateTime date)
{
var dateKey = GetDateKey(date.Year, date.Month, date.Day);
if (_usdRatesCache.ContainsKey(dateKey))
{
return(_usdRatesCache[dateKey]);
}
string dateString = date.ToString("yyyy-MM-dd");
string url = $"{OxrApiRoot.TrimEnd('/')}/historical/{dateString}.json?app_id={ApplicationId}";
var request = new HttpRequestMessage(HttpMethod.Get, url);
HttpResponseMessage response;
try
{
response = await _httpClient.SendAsync(request);
}
catch (Exception e)
{
throw new HttpRequestFailedException(
$"OxrCurrencyRatesProvider: HTTP request failed. {e.Message}",
e);
}
if (response.IsSuccessStatusCode)
{
RatesResponse ratesResponse;
using (var responseStream = await response.Content.ReadAsStreamAsync())
{
JsonReader reader = new JsonTextReader(new StreamReader(responseStream));
ratesResponse = (new JsonSerializer()).Deserialize <RatesResponse>(reader);
}
var rates = ratesResponse.Rates
.Select(x => new Rate {
CurrencyCode = x.Key, Value = x.Value
})
.ToList();
_usdRatesCache[dateKey] = rates;
return(rates);
}
else
{
throw new HttpRequestFailedException(
response.StatusCode,
$"OxrCurrencyRatesProvider: HTTP request failed. {response.ReasonPhrase}");
}
}
private async Task LoadCurrencies()
{
string url = $"{OxrApiRoot.TrimEnd('/')}/currencies.json";
var request = new HttpRequestMessage(HttpMethod.Get, url);
HttpResponseMessage response;
try
{
response = await _httpClient.SendAsync(request);
}
catch (Exception e)
{
throw new HttpRequestFailedException(
$"OxrCurrencyRatesProvider: HTTP request failed. {e.Message}",
e);
}
if (response.IsSuccessStatusCode)
{
Dictionary <string, string> currenciesResponse;
using (var responseStream = await response.Content.ReadAsStreamAsync())
{
JsonReader reader = new JsonTextReader(new StreamReader(responseStream));
currenciesResponse = (new JsonSerializer()).Deserialize <Dictionary <string, string> >(reader);
}
var currencies = currenciesResponse.Keys.ToList();
currencies.Sort();
var curId = 1;
_currencyCache = new Dictionary <int, Currency>();
foreach (var code in currencies)
{
_currencyCache.Add(curId, new Currency
{
Id = curId,
Code = code
});
curId++;
}
}
else
{
throw new HttpRequestFailedException(
response.StatusCode,
$"OxrCurrencyRatesProvider: HTTP request failed. {response.ReasonPhrase}");
}
}
