/
HttpClient.cs
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/
HttpClient.cs
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using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Net;
using NLog;
using NzbDrone.Common.Cache;
using NzbDrone.Common.EnvironmentInfo;
using NzbDrone.Common.Extensions;
using NzbDrone.Common.Http.Dispatchers;
using NzbDrone.Common.TPL;
namespace NzbDrone.Common.Http
{
public interface IHttpClient
{
HttpResponse Execute(HttpRequest request);
void DownloadFile(string url, string fileName);
HttpResponse Get(HttpRequest request);
HttpResponse<T> Get<T>(HttpRequest request)
where T : new();
HttpResponse Head(HttpRequest request);
HttpResponse Post(HttpRequest request);
HttpResponse<T> Post<T>(HttpRequest request)
where T : new();
}
public class HttpClient : IHttpClient
{
private const int MaxRedirects = 5;
private readonly Logger _logger;
private readonly IRateLimitService _rateLimitService;
private readonly ICached<CookieContainer> _cookieContainerCache;
private readonly List<IHttpRequestInterceptor> _requestInterceptors;
private readonly IHttpDispatcher _httpDispatcher;
public HttpClient(IEnumerable<IHttpRequestInterceptor> requestInterceptors,
ICacheManager cacheManager,
IRateLimitService rateLimitService,
IHttpDispatcher httpDispatcher,
Logger logger)
{
_requestInterceptors = requestInterceptors.ToList();
_rateLimitService = rateLimitService;
_httpDispatcher = httpDispatcher;
_logger = logger;
ServicePointManager.DefaultConnectionLimit = 12;
_cookieContainerCache = cacheManager.GetCache<CookieContainer>(typeof(HttpClient));
}
public HttpResponse Execute(HttpRequest request)
{
var cookieContainer = InitializeRequestCookies(request);
var response = ExecuteRequest(request, cookieContainer);
if (request.AllowAutoRedirect && response.HasHttpRedirect)
{
var autoRedirectChain = new List<string>();
autoRedirectChain.Add(request.Url.ToString());
do
{
request.Url += new HttpUri(response.Headers.GetSingleValue("Location"));
autoRedirectChain.Add(request.Url.ToString());
_logger.Trace("Redirected to {0}", request.Url);
if (autoRedirectChain.Count > MaxRedirects)
{
throw new WebException($"Too many automatic redirections were attempted for {autoRedirectChain.Join(" -> ")}", WebExceptionStatus.ProtocolError);
}
response = ExecuteRequest(request, cookieContainer);
}
while (response.HasHttpRedirect);
}
if (response.HasHttpRedirect && !RuntimeInfo.IsProduction)
{
_logger.Error("Server requested a redirect to [{0}] while in developer mode. Update the request URL to avoid this redirect.", response.Headers["Location"]);
}
if (!request.SuppressHttpError && response.HasHttpError && (request.SuppressHttpErrorStatusCodes == null || !request.SuppressHttpErrorStatusCodes.Contains(response.StatusCode)))
{
if (request.LogHttpError)
{
_logger.Warn("HTTP Error - {0}", response);
}
if ((int)response.StatusCode == 429)
{
throw new TooManyRequestsException(request, response);
}
else
{
throw new HttpException(request, response);
}
}
return response;
}
private HttpResponse ExecuteRequest(HttpRequest request, CookieContainer cookieContainer)
{
foreach (var interceptor in _requestInterceptors)
{
request = interceptor.PreRequest(request);
}
if (request.RateLimit != TimeSpan.Zero)
{
_rateLimitService.WaitAndPulse(request.Url.Host, request.RateLimitKey, request.RateLimit);
}
_logger.Trace(request);
var stopWatch = Stopwatch.StartNew();
PrepareRequestCookies(request, cookieContainer);
var response = _httpDispatcher.GetResponse(request, cookieContainer);
HandleResponseCookies(response, cookieContainer);
stopWatch.Stop();
_logger.Trace("{0} ({1} ms)", response, stopWatch.ElapsedMilliseconds);
foreach (var interceptor in _requestInterceptors)
{
response = interceptor.PostResponse(response);
}
if (request.LogResponseContent)
{
_logger.Trace("Response content ({0} bytes): {1}", response.ResponseData.Length, response.Content);
}
return response;
}
private CookieContainer InitializeRequestCookies(HttpRequest request)
{
lock (_cookieContainerCache)
{
var sourceContainer = new CookieContainer();
var presistentContainer = _cookieContainerCache.Get("container", () => new CookieContainer());
var persistentCookies = presistentContainer.GetCookies((Uri)request.Url);
sourceContainer.Add(persistentCookies);
if (request.Cookies.Count != 0)
{
foreach (var pair in request.Cookies)
{
Cookie cookie;
if (pair.Value == null)
{
cookie = new Cookie(pair.Key, "", "/")
{
Expires = DateTime.Now.AddDays(-1)
};
}
else
{
cookie = new Cookie(pair.Key, pair.Value, "/")
{
// Use Now rather than UtcNow to work around Mono cookie expiry bug.
// See https://gist.github.com/ta264/7822b1424f72e5b4c961
Expires = DateTime.Now.AddHours(1)
};
}
sourceContainer.Add((Uri)request.Url, cookie);
if (request.StoreRequestCookie)
{
presistentContainer.Add((Uri)request.Url, cookie);
}
}
}
return sourceContainer;
}
}
private void PrepareRequestCookies(HttpRequest request, CookieContainer cookieContainer)
{
// Don't collect persistnet cookies for intermediate/redirected urls.
/*lock (_cookieContainerCache)
{
var presistentContainer = _cookieContainerCache.Get("container", () => new CookieContainer());
var persistentCookies = presistentContainer.GetCookies((Uri)request.Url);
var existingCookies = cookieContainer.GetCookies((Uri)request.Url);
cookieContainer.Add(persistentCookies);
cookieContainer.Add(existingCookies);
}*/
}
private void HandleResponseCookies(HttpResponse response, CookieContainer cookieContainer)
{
var cookieHeaders = response.GetCookieHeaders();
if (cookieHeaders.Empty())
{
return;
}
if (response.Request.StoreResponseCookie)
{
lock (_cookieContainerCache)
{
var persistentCookieContainer = _cookieContainerCache.Get("container", () => new CookieContainer());
foreach (var cookieHeader in cookieHeaders)
{
try
{
persistentCookieContainer.SetCookies((Uri)response.Request.Url, cookieHeader);
}
catch (Exception ex)
{
_logger.Debug(ex, "Invalid cookie in {0}", response.Request.Url);
}
}
}
}
}
public void DownloadFile(string url, string fileName)
{
_httpDispatcher.DownloadFile(url, fileName);
}
public HttpResponse Get(HttpRequest request)
{
request.Method = HttpMethod.GET;
return Execute(request);
}
public HttpResponse<T> Get<T>(HttpRequest request)
where T : new()
{
var response = Get(request);
CheckResponseContentType(response);
return new HttpResponse<T>(response);
}
public HttpResponse Head(HttpRequest request)
{
request.Method = HttpMethod.HEAD;
return Execute(request);
}
public HttpResponse Post(HttpRequest request)
{
request.Method = HttpMethod.POST;
return Execute(request);
}
public HttpResponse<T> Post<T>(HttpRequest request)
where T : new()
{
var response = Post(request);
CheckResponseContentType(response);
return new HttpResponse<T>(response);
}
private void CheckResponseContentType(HttpResponse response)
{
if (response.Headers.ContentType != null && response.Headers.ContentType.Contains("text/html"))
{
throw new UnexpectedHtmlContentException(response);
}
}
}
}