public void Test_CronHelper_FindNextUpdateTime_Returns()
{
// Arrange
var baseDateTime = new DateTime(2020, 2, 18, 15, 50, 30);
var expectedDateTime = new DateTime(2020, 2, 18, 16, 00, 00);
var cronEveryWeekdayAt16 = "0 16 * * 1-5";
// Run
var result = CronHelper.FindNextUpdateTime(baseDateTime, cronEveryWeekdayAt16);
// Assert
Assert.Equal(result, expectedDateTime);
}
public async Task <Exchange> ExchangeRatesBySourceAndTarget(string source, string target)
{
source = source?.ToUpper();
target = target?.ToUpper();
// Check source and target currency codes are valid
var currencies = Currencies();
if (!(currencies.Any(x => x.Code.Equals(source)) && currencies.Any(x => x.Code.Equals(target))))
{
_logger.LogError("Source or Target currency invalid!");
throw new ArgumentException("Source or Target currency invalid");
}
var requestUrl = "?base=" + source + "&symbols=" + target;
if (_cache.TryGetValue(requestUrl, out Exchange responseRate))
{
return(responseRate);
}
string cron = "0 16 * * 1-5"; // Every weekday at 16.00 pm
var expiryDate = CronHelper.FindNextUpdateTime(DateTime.Now, cron);
var request = new HttpRequestMessage(HttpMethod.Get, BASE_CURRENCY_EXCHANGE_SERVICE_URL + requestUrl);
using (var client = _clientFactory.CreateClient())
{
var response = await client.SendAsync(request);
if (response.IsSuccessStatusCode)
{
var responseStream = await response.Content.ReadAsStringAsync();
var jo = JObject.Parse(responseStream);
var currencyRate = jo["rates"][target].ToString();
var updateDate = jo["date"].ToString();
var exchange = new Exchange
{
SourceCurrency = source,
TargetCurrency = target,
ExchangeRate = (decimal)double.Parse(currencyRate),
Date = DateTime.Parse(updateDate)
};
_logger.LogInformation("Exchange information read successful!", exchange);
_cache.Set(requestUrl, exchange, expiryDate);
return(exchange);
}
else
{
_logger.LogError("Exchange rates cannot be read!", response.StatusCode);
}
}
return(default);