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using Microsoft.Extensions.Caching.Memory;
using System.Net;
using System.Net.Http;
using System.Threading.Tasks;
using System.Xml.Linq;
namespace RhSolutions.Services;
public class CurrencyClient : ICurrencyClient
{
private readonly HttpClient _httpClient;
private readonly IMemoryCache _memoryCache;
private const string requestAddress = @"https://www.cbr.ru/scripts/XML_daily.asp?date_req=";
public HttpStatusCode StatusCode { get; private set; }
public CurrencyClient(HttpClient httpClient, IMemoryCache memoryCache)
{
_httpClient = httpClient;
_memoryCache = memoryCache;
}
public async Task<decimal?> GetCurrencyCourse(DateTime date)
{
if (!_memoryCache.TryGetValue(date, out decimal? exchangeRate))
{
string request = $"{requestAddress}{date.Date:dd/MM/yyyy}";
HttpResponseMessage response = await _httpClient.GetAsync(request);
try
{
response.EnsureSuccessStatusCode();
string xml = await response.Content.ReadAsStringAsync();
XElement valCourses = XElement.Parse(xml);
exchangeRate = decimal.Parse(valCourses.Elements("Valute")
.Where(e => e.Element("Name").Value == "Евро")
.FirstOrDefault()
.Element("Value").Value);
return exchangeRate;
}
catch
{
StatusCode = response.StatusCode;
exchangeRate = null;
}
var cacheEntryOptions = new MemoryCacheEntryOptions()
.SetSlidingExpiration(TimeSpan.FromHours(1));
_memoryCache.Set(date, exchangeRate, cacheEntryOptions);
}
return exchangeRate;
}
}
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