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