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854 lines
30 KiB
854 lines
30 KiB
using System;
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using System.Collections.Concurrent;
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using System.Collections.Generic;
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using System.Globalization;
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using System.IO;
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using System.Linq;
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using System.Net;
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using System.Net.Cache;
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using System.Text;
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using System.Threading;
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using System.Threading.Tasks;
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using MediaBrowser.Common.Configuration;
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using MediaBrowser.Common.Extensions;
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using MediaBrowser.Common.Net;
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using MediaBrowser.Model.IO;
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using MediaBrowser.Model.Net;
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using Microsoft.Extensions.Logging;
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namespace Emby.Server.Implementations.HttpClientManager
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{
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/// <summary>
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/// Class HttpClientManager
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/// </summary>
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public class HttpClientManager : IHttpClient
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{
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/// <summary>
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/// When one request to a host times out, we'll ban all other requests for this period of time, to prevent scans from stalling
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/// </summary>
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private const int TimeoutSeconds = 30;
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/// <summary>
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/// The _logger
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/// </summary>
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private readonly ILogger _logger;
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/// <summary>
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/// The _app paths
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/// </summary>
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private readonly IApplicationPaths _appPaths;
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private readonly IFileSystem _fileSystem;
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private readonly Func<string> _defaultUserAgentFn;
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/// <summary>
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/// Initializes a new instance of the <see cref="HttpClientManager" /> class.
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/// </summary>
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public HttpClientManager(IApplicationPaths appPaths, ILogger logger, IFileSystem fileSystem, Func<string> defaultUserAgentFn)
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{
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if (appPaths == null)
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{
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throw new ArgumentNullException(nameof(appPaths));
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}
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if (logger == null)
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{
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throw new ArgumentNullException(nameof(logger));
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}
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_logger = logger;
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_fileSystem = fileSystem;
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_appPaths = appPaths;
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_defaultUserAgentFn = defaultUserAgentFn;
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// http://stackoverflow.com/questions/566437/http-post-returns-the-error-417-expectation-failed-c
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ServicePointManager.Expect100Continue = false;
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#if NET46
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// Trakt requests sometimes fail without this
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ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3 | SecurityProtocolType.Tls;
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#endif
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}
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/// <summary>
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/// Holds a dictionary of http clients by host. Use GetHttpClient(host) to retrieve or create a client for web requests.
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/// DON'T dispose it after use.
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/// </summary>
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/// <value>The HTTP clients.</value>
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private readonly ConcurrentDictionary<string, HttpClientInfo> _httpClients = new ConcurrentDictionary<string, HttpClientInfo>();
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/// <summary>
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/// Gets
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/// </summary>
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/// <param name="host">The host.</param>
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/// <param name="enableHttpCompression">if set to <c>true</c> [enable HTTP compression].</param>
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/// <returns>HttpClient.</returns>
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/// <exception cref="ArgumentNullException">host</exception>
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private HttpClientInfo GetHttpClient(string host, bool enableHttpCompression)
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{
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if (string.IsNullOrEmpty(host))
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{
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throw new ArgumentNullException(nameof(host));
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}
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HttpClientInfo client;
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var key = host + enableHttpCompression;
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if (!_httpClients.TryGetValue(key, out client))
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{
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client = new HttpClientInfo();
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_httpClients.TryAdd(key, client);
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}
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return client;
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}
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private static WebRequest CreateWebRequest(string url)
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{
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try
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{
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return WebRequest.Create(url);
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}
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catch (NotSupportedException)
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{
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//Webrequest creation does fail on MONO randomly when using WebRequest.Create
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//the issue occurs in the GetCreator method here: http://www.oschina.net/code/explore/mono-2.8.1/mcs/class/System/System.Net/WebRequest.cs
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var type = Type.GetType("System.Net.HttpRequestCreator, System, Version=4.0.0.0,Culture=neutral, PublicKeyToken=b77a5c561934e089");
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var creator = Activator.CreateInstance(type, nonPublic: true) as IWebRequestCreate;
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return creator.Create(new Uri(url)) as HttpWebRequest;
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}
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}
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private WebRequest GetRequest(HttpRequestOptions options, string method)
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{
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string url = options.Url;
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var uriAddress = new Uri(url);
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string userInfo = uriAddress.UserInfo;
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if (!string.IsNullOrWhiteSpace(userInfo))
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{
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_logger.LogInformation("Found userInfo in url: {0} ... url: {1}", userInfo, url);
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url = url.Replace(userInfo + "@", string.Empty);
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}
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var request = CreateWebRequest(url);
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if (request is HttpWebRequest httpWebRequest)
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{
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AddRequestHeaders(httpWebRequest, options);
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if (options.EnableHttpCompression)
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{
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httpWebRequest.AutomaticDecompression = DecompressionMethods.Deflate;
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if (options.DecompressionMethod.HasValue
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&& options.DecompressionMethod.Value == CompressionMethod.Gzip)
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{
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httpWebRequest.AutomaticDecompression = DecompressionMethods.GZip;
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}
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}
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else
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{
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httpWebRequest.AutomaticDecompression = DecompressionMethods.None;
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}
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httpWebRequest.KeepAlive = options.EnableKeepAlive;
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if (!string.IsNullOrEmpty(options.Host))
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{
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httpWebRequest.Host = options.Host;
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}
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if (!string.IsNullOrEmpty(options.Referer))
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{
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httpWebRequest.Referer = options.Referer;
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}
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}
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request.CachePolicy = new RequestCachePolicy(RequestCacheLevel.BypassCache);
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request.Method = method;
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request.Timeout = options.TimeoutMs;
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if (!string.IsNullOrWhiteSpace(userInfo))
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{
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var parts = userInfo.Split(':');
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if (parts.Length == 2)
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{
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request.Credentials = GetCredential(url, parts[0], parts[1]);
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// TODO: .net core ??
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request.PreAuthenticate = true;
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}
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}
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return request;
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}
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private static CredentialCache GetCredential(string url, string username, string password)
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{
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//ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3;
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var credentialCache = new CredentialCache();
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credentialCache.Add(new Uri(url), "Basic", new NetworkCredential(username, password));
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return credentialCache;
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}
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private void AddRequestHeaders(HttpWebRequest request, HttpRequestOptions options)
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{
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var hasUserAgent = false;
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foreach (var header in options.RequestHeaders)
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{
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if (string.Equals(header.Key, "Accept", StringComparison.OrdinalIgnoreCase))
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{
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request.Accept = header.Value;
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}
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else if (string.Equals(header.Key, "User-Agent", StringComparison.OrdinalIgnoreCase))
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{
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SetUserAgent(request, header.Value);
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hasUserAgent = true;
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}
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else
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{
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request.Headers.Set(header.Key, header.Value);
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}
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}
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if (!hasUserAgent && options.EnableDefaultUserAgent)
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{
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SetUserAgent(request, _defaultUserAgentFn());
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}
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}
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private static void SetUserAgent(HttpWebRequest request, string userAgent)
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{
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request.UserAgent = userAgent;
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}
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/// <summary>
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/// Gets the response internal.
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/// </summary>
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/// <param name="options">The options.</param>
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/// <returns>Task{HttpResponseInfo}.</returns>
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public Task<HttpResponseInfo> GetResponse(HttpRequestOptions options)
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{
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return SendAsync(options, "GET");
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}
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/// <summary>
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/// Performs a GET request and returns the resulting stream
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/// </summary>
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/// <param name="options">The options.</param>
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/// <returns>Task{Stream}.</returns>
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public async Task<Stream> Get(HttpRequestOptions options)
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{
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var response = await GetResponse(options).ConfigureAwait(false);
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return response.Content;
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}
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/// <summary>
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/// send as an asynchronous operation.
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/// </summary>
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/// <param name="options">The options.</param>
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/// <param name="httpMethod">The HTTP method.</param>
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/// <returns>Task{HttpResponseInfo}.</returns>
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/// <exception cref="HttpException">
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/// </exception>
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public async Task<HttpResponseInfo> SendAsync(HttpRequestOptions options, string httpMethod)
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{
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if (options.CacheMode == CacheMode.None)
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{
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return await SendAsyncInternal(options, httpMethod).ConfigureAwait(false);
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}
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var url = options.Url;
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var urlHash = url.ToLower().GetMD5().ToString("N");
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var responseCachePath = Path.Combine(_appPaths.CachePath, "httpclient", urlHash);
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var response = await GetCachedResponse(responseCachePath, options.CacheLength, url).ConfigureAwait(false);
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if (response != null)
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{
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return response;
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}
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response = await SendAsyncInternal(options, httpMethod).ConfigureAwait(false);
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if (response.StatusCode == HttpStatusCode.OK)
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{
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await CacheResponse(response, responseCachePath).ConfigureAwait(false);
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}
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return response;
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}
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private async Task<HttpResponseInfo> GetCachedResponse(string responseCachePath, TimeSpan cacheLength, string url)
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{
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try
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{
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if (_fileSystem.GetLastWriteTimeUtc(responseCachePath).Add(cacheLength) > DateTime.UtcNow)
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{
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using (var stream = _fileSystem.GetFileStream(responseCachePath, FileOpenMode.Open, FileAccessMode.Read, FileShareMode.Read, true))
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{
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var memoryStream = new MemoryStream();
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await stream.CopyToAsync(memoryStream).ConfigureAwait(false);
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memoryStream.Position = 0;
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return new HttpResponseInfo
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{
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ResponseUrl = url,
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Content = memoryStream,
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StatusCode = HttpStatusCode.OK,
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ContentLength = memoryStream.Length
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};
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}
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}
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}
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catch (FileNotFoundException)
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{
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}
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catch (DirectoryNotFoundException)
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{
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}
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return null;
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}
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private async Task CacheResponse(HttpResponseInfo response, string responseCachePath)
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{
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_fileSystem.CreateDirectory(_fileSystem.GetDirectoryName(responseCachePath));
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using (var responseStream = response.Content)
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{
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var memoryStream = new MemoryStream();
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await responseStream.CopyToAsync(memoryStream).ConfigureAwait(false);
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memoryStream.Position = 0;
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using (var fileStream = _fileSystem.GetFileStream(responseCachePath, FileOpenMode.Create, FileAccessMode.Write, FileShareMode.None, true))
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{
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await memoryStream.CopyToAsync(fileStream).ConfigureAwait(false);
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memoryStream.Position = 0;
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response.Content = memoryStream;
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}
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}
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}
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private async Task<HttpResponseInfo> SendAsyncInternal(HttpRequestOptions options, string httpMethod)
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{
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ValidateParams(options);
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options.CancellationToken.ThrowIfCancellationRequested();
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var client = GetHttpClient(GetHostFromUrl(options.Url), options.EnableHttpCompression);
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if ((DateTime.UtcNow - client.LastTimeout).TotalSeconds < TimeoutSeconds)
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{
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throw new HttpException(string.Format("Cancelling connection to {0} due to a previous timeout.", options.Url))
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{
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IsTimedOut = true
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};
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}
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var httpWebRequest = GetRequest(options, httpMethod);
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if (options.RequestContentBytes != null ||
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!string.IsNullOrEmpty(options.RequestContent) ||
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string.Equals(httpMethod, "post", StringComparison.OrdinalIgnoreCase))
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{
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try
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{
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var bytes = options.RequestContentBytes ?? Encoding.UTF8.GetBytes(options.RequestContent ?? string.Empty);
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var contentType = options.RequestContentType ?? "application/x-www-form-urlencoded";
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if (options.AppendCharsetToMimeType)
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{
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contentType = contentType.TrimEnd(';') + "; charset=\"utf-8\"";
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}
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httpWebRequest.ContentType = contentType;
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httpWebRequest.ContentLength = bytes.Length;
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(await httpWebRequest.GetRequestStreamAsync().ConfigureAwait(false)).Write(bytes, 0, bytes.Length);
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}
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catch (Exception ex)
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{
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throw new HttpException(ex.Message) { IsTimedOut = true };
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}
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}
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if (options.ResourcePool != null)
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{
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await options.ResourcePool.WaitAsync(options.CancellationToken).ConfigureAwait(false);
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}
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if ((DateTime.UtcNow - client.LastTimeout).TotalSeconds < TimeoutSeconds)
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{
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options.ResourcePool?.Release();
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throw new HttpException(string.Format("Connection to {0} timed out", options.Url)) { IsTimedOut = true };
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}
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if (options.LogRequest)
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{
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if (options.LogRequestAsDebug)
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{
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_logger.LogDebug("HttpClientManager {0}: {1}", httpMethod.ToUpper(), options.Url);
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}
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else
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{
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_logger.LogInformation("HttpClientManager {0}: {1}", httpMethod.ToUpper(), options.Url);
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}
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}
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try
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{
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options.CancellationToken.ThrowIfCancellationRequested();
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if (!options.BufferContent)
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{
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var response = await GetResponseAsync(httpWebRequest, TimeSpan.FromMilliseconds(options.TimeoutMs)).ConfigureAwait(false);
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var httpResponse = (HttpWebResponse)response;
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EnsureSuccessStatusCode(client, httpResponse, options);
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options.CancellationToken.ThrowIfCancellationRequested();
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return GetResponseInfo(httpResponse, httpResponse.GetResponseStream(), GetContentLength(httpResponse), httpResponse);
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}
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using (var response = await GetResponseAsync(httpWebRequest, TimeSpan.FromMilliseconds(options.TimeoutMs)).ConfigureAwait(false))
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{
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var httpResponse = (HttpWebResponse)response;
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EnsureSuccessStatusCode(client, httpResponse, options);
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options.CancellationToken.ThrowIfCancellationRequested();
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using (var stream = httpResponse.GetResponseStream())
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{
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var memoryStream = new MemoryStream();
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await stream.CopyToAsync(memoryStream).ConfigureAwait(false);
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memoryStream.Position = 0;
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return GetResponseInfo(httpResponse, memoryStream, memoryStream.Length, null);
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}
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}
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}
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catch (OperationCanceledException ex)
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{
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throw GetCancellationException(options, client, options.CancellationToken, ex);
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}
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catch (Exception ex)
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{
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throw GetException(ex, options, client);
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}
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finally
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{
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options.ResourcePool?.Release();
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}
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}
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private HttpResponseInfo GetResponseInfo(HttpWebResponse httpResponse, Stream content, long? contentLength, IDisposable disposable)
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{
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var responseInfo = new HttpResponseInfo(disposable)
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{
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Content = content,
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StatusCode = httpResponse.StatusCode,
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ContentType = httpResponse.ContentType,
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ContentLength = contentLength,
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ResponseUrl = httpResponse.ResponseUri.ToString()
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};
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if (httpResponse.Headers != null)
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{
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SetHeaders(httpResponse.Headers, responseInfo);
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}
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return responseInfo;
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}
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private HttpResponseInfo GetResponseInfo(HttpWebResponse httpResponse, string tempFile, long? contentLength)
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{
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var responseInfo = new HttpResponseInfo
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{
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TempFilePath = tempFile,
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StatusCode = httpResponse.StatusCode,
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ContentType = httpResponse.ContentType,
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ContentLength = contentLength
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};
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if (httpResponse.Headers != null)
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{
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SetHeaders(httpResponse.Headers, responseInfo);
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}
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return responseInfo;
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}
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private static void SetHeaders(WebHeaderCollection headers, HttpResponseInfo responseInfo)
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{
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foreach (var key in headers.AllKeys)
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{
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responseInfo.Headers[key] = headers[key];
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}
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}
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public Task<HttpResponseInfo> Post(HttpRequestOptions options)
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{
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return SendAsync(options, "POST");
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}
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/// <summary>
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/// Performs a POST request
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/// </summary>
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/// <param name="options">The options.</param>
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/// <param name="postData">Params to add to the POST data.</param>
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/// <returns>stream on success, null on failure</returns>
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public async Task<Stream> Post(HttpRequestOptions options, Dictionary<string, string> postData)
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{
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options.SetPostData(postData);
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var response = await Post(options).ConfigureAwait(false);
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return response.Content;
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}
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/// <summary>
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/// Downloads the contents of a given url into a temporary location
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/// </summary>
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/// <param name="options">The options.</param>
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/// <returns>Task{System.String}.</returns>
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public async Task<string> GetTempFile(HttpRequestOptions options)
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{
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var response = await GetTempFileResponse(options).ConfigureAwait(false);
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return response.TempFilePath;
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}
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public async Task<HttpResponseInfo> GetTempFileResponse(HttpRequestOptions options)
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{
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ValidateParams(options);
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_fileSystem.CreateDirectory(_appPaths.TempDirectory);
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var tempFile = Path.Combine(_appPaths.TempDirectory, Guid.NewGuid() + ".tmp");
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if (options.Progress == null)
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{
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throw new ArgumentException("Options did not have a Progress value.", nameof(options));
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}
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options.CancellationToken.ThrowIfCancellationRequested();
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var httpWebRequest = GetRequest(options, "GET");
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if (options.ResourcePool != null)
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{
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await options.ResourcePool.WaitAsync(options.CancellationToken).ConfigureAwait(false);
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}
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options.Progress.Report(0);
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if (options.LogRequest)
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{
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if (options.LogRequestAsDebug)
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{
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_logger.LogDebug("HttpClientManager.GetTempFileResponse url: {0}", options.Url);
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}
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else
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{
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|
_logger.LogInformation("HttpClientManager.GetTempFileResponse url: {0}", options.Url);
|
|
}
|
|
}
|
|
|
|
var client = GetHttpClient(GetHostFromUrl(options.Url), options.EnableHttpCompression);
|
|
|
|
try
|
|
{
|
|
options.CancellationToken.ThrowIfCancellationRequested();
|
|
|
|
using (var response = await httpWebRequest.GetResponseAsync().ConfigureAwait(false))
|
|
{
|
|
var httpResponse = (HttpWebResponse)response;
|
|
|
|
EnsureSuccessStatusCode(client, httpResponse, options);
|
|
|
|
options.CancellationToken.ThrowIfCancellationRequested();
|
|
|
|
var contentLength = GetContentLength(httpResponse);
|
|
|
|
if (contentLength.HasValue)
|
|
{
|
|
using (var fs = _fileSystem.GetFileStream(tempFile, FileOpenMode.Create, FileAccessMode.Write, FileShareMode.Read, true))
|
|
{
|
|
await httpResponse.GetResponseStream().CopyToAsync(fs, StreamDefaults.DefaultCopyToBufferSize, options.CancellationToken).ConfigureAwait(false);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
// We're not able to track progress
|
|
using (var stream = httpResponse.GetResponseStream())
|
|
using (var fs = _fileSystem.GetFileStream(tempFile, FileOpenMode.Create, FileAccessMode.Write, FileShareMode.Read, true))
|
|
{
|
|
await stream.CopyToAsync(fs, StreamDefaults.DefaultCopyToBufferSize, options.CancellationToken).ConfigureAwait(false);
|
|
}
|
|
}
|
|
|
|
options.Progress.Report(100);
|
|
|
|
return GetResponseInfo(httpResponse, tempFile, contentLength);
|
|
}
|
|
}
|
|
catch (Exception ex)
|
|
{
|
|
DeleteTempFile(tempFile);
|
|
throw GetException(ex, options, client);
|
|
}
|
|
finally
|
|
{
|
|
options.ResourcePool?.Release();
|
|
}
|
|
}
|
|
|
|
private static long? GetContentLength(HttpWebResponse response)
|
|
{
|
|
var length = response.ContentLength;
|
|
|
|
if (length == 0)
|
|
{
|
|
return null;
|
|
}
|
|
|
|
return length;
|
|
}
|
|
|
|
protected static readonly CultureInfo UsCulture = new CultureInfo("en-US");
|
|
|
|
private Exception GetException(Exception ex, HttpRequestOptions options, HttpClientInfo client)
|
|
{
|
|
if (ex is HttpException)
|
|
{
|
|
return ex;
|
|
}
|
|
|
|
var webException = ex as WebException
|
|
?? ex.InnerException as WebException;
|
|
|
|
if (webException != null)
|
|
{
|
|
if (options.LogErrors)
|
|
{
|
|
_logger.LogError(webException, "Error {status} getting response from {url}", webException.Status, options.Url);
|
|
}
|
|
|
|
var exception = new HttpException(webException.Message, webException);
|
|
|
|
var response = webException.Response as HttpWebResponse;
|
|
if (response != null)
|
|
{
|
|
exception.StatusCode = response.StatusCode;
|
|
|
|
if ((int)response.StatusCode == 429)
|
|
{
|
|
client.LastTimeout = DateTime.UtcNow;
|
|
}
|
|
}
|
|
|
|
if (!exception.StatusCode.HasValue)
|
|
{
|
|
if (webException.Status == WebExceptionStatus.NameResolutionFailure ||
|
|
webException.Status == WebExceptionStatus.ConnectFailure)
|
|
{
|
|
exception.IsTimedOut = true;
|
|
}
|
|
}
|
|
|
|
return exception;
|
|
}
|
|
|
|
var operationCanceledException = ex as OperationCanceledException
|
|
?? ex.InnerException as OperationCanceledException;
|
|
|
|
if (operationCanceledException != null)
|
|
{
|
|
return GetCancellationException(options, client, options.CancellationToken, operationCanceledException);
|
|
}
|
|
|
|
if (options.LogErrors)
|
|
{
|
|
_logger.LogError(ex, "Error getting response from {url}", options.Url);
|
|
}
|
|
|
|
return ex;
|
|
}
|
|
|
|
private void DeleteTempFile(string file)
|
|
{
|
|
try
|
|
{
|
|
_fileSystem.DeleteFile(file);
|
|
}
|
|
catch (IOException)
|
|
{
|
|
// Might not have been created at all. No need to worry.
|
|
}
|
|
}
|
|
|
|
private void ValidateParams(HttpRequestOptions options)
|
|
{
|
|
if (string.IsNullOrEmpty(options.Url))
|
|
{
|
|
throw new ArgumentNullException(nameof(options));
|
|
}
|
|
}
|
|
|
|
/// <summary>
|
|
/// Gets the host from URL.
|
|
/// </summary>
|
|
/// <param name="url">The URL.</param>
|
|
/// <returns>System.String.</returns>
|
|
private static string GetHostFromUrl(string url)
|
|
{
|
|
var index = url.IndexOf("://", StringComparison.OrdinalIgnoreCase);
|
|
|
|
if (index != -1)
|
|
{
|
|
url = url.Substring(index + 3);
|
|
var host = url.Split(new[] { '/' }, StringSplitOptions.RemoveEmptyEntries).FirstOrDefault();
|
|
|
|
if (!string.IsNullOrWhiteSpace(host))
|
|
{
|
|
return host;
|
|
}
|
|
}
|
|
|
|
return url;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Throws the cancellation exception.
|
|
/// </summary>
|
|
/// <param name="options">The options.</param>
|
|
/// <param name="client">The client.</param>
|
|
/// <param name="cancellationToken">The cancellation token.</param>
|
|
/// <param name="exception">The exception.</param>
|
|
/// <returns>Exception.</returns>
|
|
private Exception GetCancellationException(HttpRequestOptions options, HttpClientInfo client, CancellationToken cancellationToken, OperationCanceledException exception)
|
|
{
|
|
// If the HttpClient's timeout is reached, it will cancel the Task internally
|
|
if (!cancellationToken.IsCancellationRequested)
|
|
{
|
|
var msg = string.Format("Connection to {0} timed out", options.Url);
|
|
|
|
if (options.LogErrors)
|
|
{
|
|
_logger.LogError(msg);
|
|
}
|
|
|
|
client.LastTimeout = DateTime.UtcNow;
|
|
|
|
// Throw an HttpException so that the caller doesn't think it was cancelled by user code
|
|
return new HttpException(msg, exception)
|
|
{
|
|
IsTimedOut = true
|
|
};
|
|
}
|
|
|
|
return exception;
|
|
}
|
|
|
|
private void EnsureSuccessStatusCode(HttpClientInfo client, HttpWebResponse response, HttpRequestOptions options)
|
|
{
|
|
var statusCode = response.StatusCode;
|
|
|
|
var isSuccessful = statusCode >= HttpStatusCode.OK && statusCode <= (HttpStatusCode)299;
|
|
|
|
if (isSuccessful)
|
|
{
|
|
return;
|
|
}
|
|
|
|
if (options.LogErrorResponseBody)
|
|
{
|
|
try
|
|
{
|
|
using (var stream = response.GetResponseStream())
|
|
{
|
|
if (stream != null)
|
|
{
|
|
using (var reader = new StreamReader(stream))
|
|
{
|
|
var msg = reader.ReadToEnd();
|
|
|
|
_logger.LogError(msg);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
catch
|
|
{
|
|
|
|
}
|
|
}
|
|
|
|
throw new HttpException(response.StatusDescription)
|
|
{
|
|
StatusCode = response.StatusCode
|
|
};
|
|
}
|
|
|
|
private static Task<WebResponse> GetResponseAsync(WebRequest request, TimeSpan timeout)
|
|
{
|
|
var taskCompletion = new TaskCompletionSource<WebResponse>();
|
|
|
|
var asyncTask = Task.Factory.FromAsync(request.BeginGetResponse, request.EndGetResponse, null);
|
|
|
|
ThreadPool.RegisterWaitForSingleObject((asyncTask as IAsyncResult).AsyncWaitHandle, TimeoutCallback, request, timeout, true);
|
|
var callback = new TaskCallback { taskCompletion = taskCompletion };
|
|
asyncTask.ContinueWith(callback.OnSuccess, TaskContinuationOptions.NotOnFaulted);
|
|
|
|
// Handle errors
|
|
asyncTask.ContinueWith(callback.OnError, TaskContinuationOptions.OnlyOnFaulted);
|
|
|
|
return taskCompletion.Task;
|
|
}
|
|
|
|
private static void TimeoutCallback(object state, bool timedOut)
|
|
{
|
|
if (timedOut && state != null)
|
|
{
|
|
var request = (WebRequest)state;
|
|
request.Abort();
|
|
}
|
|
}
|
|
|
|
private class TaskCallback
|
|
{
|
|
public TaskCompletionSource<WebResponse> taskCompletion;
|
|
|
|
public void OnSuccess(Task<WebResponse> task)
|
|
{
|
|
taskCompletion.TrySetResult(task.Result);
|
|
}
|
|
|
|
public void OnError(Task<WebResponse> task)
|
|
{
|
|
if (task.Exception == null)
|
|
{
|
|
taskCompletion.TrySetException(Enumerable.Empty<Exception>());
|
|
}
|
|
else
|
|
{
|
|
taskCompletion.TrySetException(task.Exception);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|