public async Task <IActionResult> AllCurrencies(int?page, [FromQuery] int?count)
{
try
{
GetCurrencyOpts opts = new GetCurrencyOpts(page ?? 1, count ?? 5);
var currencies = await _currencyService.GetCurrenciesAsync(opts);
var viewModels = currencies.Select(x => new CurrencyViewModel(x));
return(Ok(viewModels));
}
catch (Exception e)
{
return(ProcessError(e));
}
}
public async Task <IEnumerable <CurrencyData> > GetCurrenciesAsync(GetCurrencyOpts opts = null)
{
if (!_memCache.TryGetValue(MEMCACHE_CURRENCIES_KEY, out IEnumerable <CurrencyData> currencies))
{
try
{
using var client = _httpFactory.CreateClient();
var data = await client.GetAsync(BANK_GET_CURRENCIES_URL);
var resultStr = await data.Content.ReadAsStringAsync();
currencies = JsonConvert.DeserializeObject <BankDailyResult>(resultStr).Valute.Values;
}
catch (JsonException)
{
throw new Exception("Error while deserialize data, bank maybe change json format");
}
catch (HttpRequestException)
{
throw new BankServiceException("Error while make request to bank, maybe he go offline");
}
DateTime dateForRefresh = new DateTime(
DateTime.Now.Year, DateTime.Now.Month, DateTime.Now.Day, 11, 30, 00
);
if (DateTime.Now.Hour > 11 || (DateTime.Now.Hour == 11 && DateTime.Now.Minute > 30))
{
dateForRefresh = dateForRefresh.AddDays(1);
}
// ЦБ РФ определяет курс в 11:30, так что можем смело кешировать, до этого времени
_memCache.Set(MEMCACHE_CURRENCIES_KEY, currencies, dateForRefresh);
}
if (opts != null)
{
currencies = currencies.Skip((opts.Page - 1) * opts.Count).Take(opts.Count);
}
return(currencies);
}