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Add memory cache to currency client

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This commit is contained in:
Serghei Cebotari 2024-01-18 23:16:27 +03:00
parent 822398e286
commit fe58c854ea
1 changed files with 28 additions and 19 deletions
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47
RhSolutions.AddIn/Services/CurrencyClient.cs
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@ -1,4 +1,5 @@
using System.Net;
using Microsoft.Extensions.Caching.Memory;
using System.Net;
using System.Net.Http;
using System.Threading.Tasks;
using System.Xml.Linq;
@ -8,34 +9,42 @@ 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)
public CurrencyClient(HttpClient httpClient, IMemoryCache memoryCache)
{
_httpClient = httpClient;
_memoryCache = memoryCache;
}
public async Task<decimal?> GetExchangeRate(DateTime date)
{
string request = $"{_requestAddress}{date.Date:dd/MM/yyyy}";
HttpResponseMessage response = await _httpClient.GetAsync(request);
try
if (!_memoryCache.TryGetValue(date, out decimal exchangeRate))
{
response.EnsureSuccessStatusCode();
string xml = await response.Content.ReadAsStringAsync();
XElement valCourses = XElement.Parse(xml);
decimal? exchangeRate = decimal.Parse(valCourses.Elements("Valute")
.Where(e => e.Element("Name").Value == "Евро")
.FirstOrDefault()
.Element("Value").Value);
return exchangeRate;
}
catch
{
StatusCode = response.StatusCode;
return null;
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);
var cacheEntryOptions = new MemoryCacheEntryOptions()
.SetSlidingExpiration(TimeSpan.FromHours(1));
_memoryCache.Set(date, exchangeRate, cacheEntryOptions);
return exchangeRate;
}
catch
{
StatusCode = response.StatusCode;
return null;
}
}
return exchangeRate;
}
}