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482 lines
18 KiB
C#
482 lines
18 KiB
C#
using MediaBrowser.Common.IO;
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using MediaBrowser.Common.Kernel;
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using MediaBrowser.Model.Logging;
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using MediaBrowser.Model.Net;
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using System;
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using System.Collections.Concurrent;
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using System.Collections.Generic;
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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.Net.Http;
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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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namespace MediaBrowser.Common.Net
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{
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/// <summary>
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/// Class HttpManager
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/// </summary>
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public class HttpManager : IDisposable
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{
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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 _kernel
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/// </summary>
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private readonly IKernel _kernel;
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/// <summary>
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/// Initializes a new instance of the <see cref="HttpManager" /> class.
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/// </summary>
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/// <param name="kernel">The kernel.</param>
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/// <param name="logger">The logger.</param>
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public HttpManager(IKernel kernel, ILogger logger)
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{
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if (kernel == null)
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{
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throw new ArgumentNullException("kernel");
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}
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if (logger == null)
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{
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throw new ArgumentNullException("logger");
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}
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_logger = logger;
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_kernel = kernel;
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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, HttpClient> _httpClients = new ConcurrentDictionary<string, HttpClient>();
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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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/// <returns>HttpClient.</returns>
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/// <exception cref="System.ArgumentNullException">host</exception>
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private HttpClient GetHttpClient(string host)
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{
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if (string.IsNullOrEmpty(host))
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{
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throw new ArgumentNullException("host");
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}
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HttpClient client;
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if (!_httpClients.TryGetValue(host, out client))
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{
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var handler = new WebRequestHandler
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{
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AutomaticDecompression = DecompressionMethods.Deflate,
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CachePolicy = new RequestCachePolicy(RequestCacheLevel.Revalidate)
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};
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client = new HttpClient(handler);
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client.DefaultRequestHeaders.Add("Accept", "application/json,image/*");
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client.Timeout = TimeSpan.FromSeconds(15);
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_httpClients.TryAdd(host, client);
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}
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return client;
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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="url">The URL.</param>
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/// <param name="resourcePool">The resource pool.</param>
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/// <param name="cancellationToken">The cancellation token.</param>
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/// <returns>Task{Stream}.</returns>
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/// <exception cref="MediaBrowser.Model.Net.HttpException"></exception>
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public async Task<Stream> Get(string url, SemaphoreSlim resourcePool, CancellationToken cancellationToken)
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{
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ValidateParams(url, resourcePool, cancellationToken);
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cancellationToken.ThrowIfCancellationRequested();
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await resourcePool.WaitAsync(cancellationToken).ConfigureAwait(false);
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_logger.Info("HttpManager.Get url: {0}", url);
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try
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{
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cancellationToken.ThrowIfCancellationRequested();
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var msg = await GetHttpClient(GetHostFromUrl(url)).GetAsync(url, cancellationToken).ConfigureAwait(false);
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EnsureSuccessStatusCode(msg);
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return await msg.Content.ReadAsStreamAsync().ConfigureAwait(false);
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}
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catch (OperationCanceledException ex)
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{
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throw GetCancellationException(url, cancellationToken, ex);
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}
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catch (HttpRequestException ex)
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{
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_logger.ErrorException("Error getting response from " + url, ex);
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throw new HttpException(ex.Message, ex);
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}
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finally
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{
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resourcePool.Release();
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}
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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="url">The URL.</param>
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/// <param name="postData">Params to add to the POST data.</param>
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/// <param name="resourcePool">The resource pool.</param>
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/// <param name="cancellationToken">The cancellation token.</param>
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/// <returns>stream on success, null on failure</returns>
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/// <exception cref="System.ArgumentNullException">postData</exception>
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/// <exception cref="MediaBrowser.Model.Net.HttpException"></exception>
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public async Task<Stream> Post(string url, Dictionary<string, string> postData, SemaphoreSlim resourcePool, CancellationToken cancellationToken)
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{
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ValidateParams(url, resourcePool, cancellationToken);
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if (postData == null)
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{
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throw new ArgumentNullException("postData");
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}
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cancellationToken.ThrowIfCancellationRequested();
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var strings = postData.Keys.Select(key => string.Format("{0}={1}", key, postData[key]));
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var postContent = string.Join("&", strings.ToArray());
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var content = new StringContent(postContent, Encoding.UTF8, "application/x-www-form-urlencoded");
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await resourcePool.WaitAsync(cancellationToken).ConfigureAwait(false);
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_logger.Info("HttpManager.Post url: {0}", url);
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try
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{
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cancellationToken.ThrowIfCancellationRequested();
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var msg = await GetHttpClient(GetHostFromUrl(url)).PostAsync(url, content, cancellationToken).ConfigureAwait(false);
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EnsureSuccessStatusCode(msg);
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return await msg.Content.ReadAsStreamAsync().ConfigureAwait(false);
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}
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catch (OperationCanceledException ex)
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{
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throw GetCancellationException(url, cancellationToken, ex);
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}
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catch (HttpRequestException ex)
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{
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_logger.ErrorException("Error getting response from " + url, ex);
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throw new HttpException(ex.Message, ex);
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}
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finally
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{
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resourcePool.Release();
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}
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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="url">The URL.</param>
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/// <param name="resourcePool">The resource pool.</param>
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/// <param name="cancellationToken">The cancellation token.</param>
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/// <param name="progress">The progress.</param>
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/// <param name="userAgent">The user agent.</param>
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/// <returns>Task{System.String}.</returns>
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/// <exception cref="System.ArgumentNullException">progress</exception>
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/// <exception cref="MediaBrowser.Model.Net.HttpException"></exception>
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public async Task<string> FetchToTempFile(string url, SemaphoreSlim resourcePool, CancellationToken cancellationToken, IProgress<double> progress, string userAgent = null)
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{
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ValidateParams(url, resourcePool, cancellationToken);
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if (progress == null)
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{
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throw new ArgumentNullException("progress");
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}
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cancellationToken.ThrowIfCancellationRequested();
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var tempFile = Path.Combine(_kernel.ApplicationPaths.TempDirectory, Guid.NewGuid() + ".tmp");
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var message = new HttpRequestMessage(HttpMethod.Get, url);
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if (!string.IsNullOrEmpty(userAgent))
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{
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message.Headers.Add("User-Agent", userAgent);
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}
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await resourcePool.WaitAsync(cancellationToken).ConfigureAwait(false);
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_logger.Info("HttpManager.FetchToTempFile url: {0}, temp file: {1}", url, tempFile);
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try
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{
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cancellationToken.ThrowIfCancellationRequested();
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using (var response = await GetHttpClient(GetHostFromUrl(url)).SendAsync(message, HttpCompletionOption.ResponseHeadersRead, cancellationToken).ConfigureAwait(false))
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{
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EnsureSuccessStatusCode(response);
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cancellationToken.ThrowIfCancellationRequested();
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IEnumerable<string> lengthValues;
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if (!response.Headers.TryGetValues("content-length", out lengthValues) &&
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!response.Content.Headers.TryGetValues("content-length", out lengthValues))
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{
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// We're not able to track progress
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using (var stream = await response.Content.ReadAsStreamAsync().ConfigureAwait(false))
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{
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using (var fs = new FileStream(tempFile, FileMode.Create, FileAccess.Write, FileShare.Read, StreamDefaults.DefaultFileStreamBufferSize, FileOptions.Asynchronous))
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{
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await stream.CopyToAsync(fs, StreamDefaults.DefaultCopyToBufferSize, cancellationToken).ConfigureAwait(false);
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}
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}
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}
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else
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{
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var length = long.Parse(string.Join(string.Empty, lengthValues.ToArray()));
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using (var stream = ProgressStream.CreateReadProgressStream(await response.Content.ReadAsStreamAsync().ConfigureAwait(false), progress.Report, length))
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{
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using (var fs = new FileStream(tempFile, FileMode.Create, FileAccess.Write, FileShare.Read, StreamDefaults.DefaultFileStreamBufferSize, FileOptions.Asynchronous))
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{
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await stream.CopyToAsync(fs, StreamDefaults.DefaultCopyToBufferSize, cancellationToken).ConfigureAwait(false);
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}
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}
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}
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progress.Report(100);
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cancellationToken.ThrowIfCancellationRequested();
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}
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return tempFile;
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}
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catch (OperationCanceledException ex)
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{
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// Cleanup
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if (File.Exists(tempFile))
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{
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File.Delete(tempFile);
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}
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throw GetCancellationException(url, cancellationToken, ex);
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}
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catch (HttpRequestException ex)
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{
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_logger.ErrorException("Error getting response from " + url, ex);
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// Cleanup
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if (File.Exists(tempFile))
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{
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File.Delete(tempFile);
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}
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throw new HttpException(ex.Message, ex);
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}
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catch (Exception ex)
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{
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_logger.ErrorException("Error getting response from " + url, ex);
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// Cleanup
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if (File.Exists(tempFile))
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{
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File.Delete(tempFile);
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}
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throw;
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}
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finally
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{
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resourcePool.Release();
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}
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}
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/// <summary>
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/// Downloads the contents of a given url into a MemoryStream
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/// </summary>
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/// <param name="url">The URL.</param>
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/// <param name="resourcePool">The resource pool.</param>
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/// <param name="cancellationToken">The cancellation token.</param>
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/// <returns>Task{MemoryStream}.</returns>
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/// <exception cref="MediaBrowser.Model.Net.HttpException"></exception>
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public async Task<MemoryStream> FetchToMemoryStream(string url, SemaphoreSlim resourcePool, CancellationToken cancellationToken)
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{
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ValidateParams(url, resourcePool, cancellationToken);
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cancellationToken.ThrowIfCancellationRequested();
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var message = new HttpRequestMessage(HttpMethod.Get, url);
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await resourcePool.WaitAsync(cancellationToken).ConfigureAwait(false);
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var ms = new MemoryStream();
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_logger.Info("HttpManager.FetchToMemoryStream url: {0}", url);
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try
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{
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cancellationToken.ThrowIfCancellationRequested();
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using (var response = await GetHttpClient(GetHostFromUrl(url)).SendAsync(message, HttpCompletionOption.ResponseHeadersRead, cancellationToken).ConfigureAwait(false))
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{
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EnsureSuccessStatusCode(response);
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cancellationToken.ThrowIfCancellationRequested();
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using (var stream = await response.Content.ReadAsStreamAsync().ConfigureAwait(false))
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{
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await stream.CopyToAsync(ms, StreamDefaults.DefaultCopyToBufferSize, cancellationToken).ConfigureAwait(false);
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}
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cancellationToken.ThrowIfCancellationRequested();
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}
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ms.Position = 0;
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return ms;
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}
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catch (OperationCanceledException ex)
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{
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ms.Dispose();
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throw GetCancellationException(url, cancellationToken, ex);
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}
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catch (HttpRequestException ex)
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{
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_logger.ErrorException("Error getting response from " + url, ex);
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ms.Dispose();
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throw new HttpException(ex.Message, ex);
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}
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catch (Exception ex)
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{
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_logger.ErrorException("Error getting response from " + url, ex);
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ms.Dispose();
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throw;
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}
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finally
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{
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resourcePool.Release();
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}
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}
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/// <summary>
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/// Validates the params.
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/// </summary>
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/// <param name="url">The URL.</param>
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/// <param name="resourcePool">The resource pool.</param>
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/// <param name="cancellationToken">The cancellation token.</param>
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/// <exception cref="System.ArgumentNullException">url</exception>
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private void ValidateParams(string url, SemaphoreSlim resourcePool, CancellationToken cancellationToken)
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{
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if (string.IsNullOrEmpty(url))
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{
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throw new ArgumentNullException("url");
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}
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if (resourcePool == null)
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{
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throw new ArgumentNullException("resourcePool");
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}
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if (cancellationToken == null)
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{
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throw new ArgumentNullException("cancellationToken");
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}
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}
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/// <summary>
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/// Gets the host from URL.
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/// </summary>
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/// <param name="url">The URL.</param>
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/// <returns>System.String.</returns>
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private string GetHostFromUrl(string url)
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{
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var start = url.IndexOf("://", StringComparison.OrdinalIgnoreCase) + 3;
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var len = url.IndexOf('/', start) - start;
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return url.Substring(start, len);
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}
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/// <summary>
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/// Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.
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/// </summary>
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public void Dispose()
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{
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Dispose(true);
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GC.SuppressFinalize(this);
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}
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/// <summary>
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/// Releases unmanaged and - optionally - managed resources.
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/// </summary>
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/// <param name="dispose"><c>true</c> to release both managed and unmanaged resources; <c>false</c> to release only unmanaged resources.</param>
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protected virtual void Dispose(bool dispose)
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{
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if (dispose)
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{
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foreach (var client in _httpClients.Values.ToList())
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{
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client.Dispose();
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}
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_httpClients.Clear();
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}
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}
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/// <summary>
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/// Throws the cancellation exception.
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/// </summary>
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/// <param name="url">The URL.</param>
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/// <param name="cancellationToken">The cancellation token.</param>
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/// <param name="exception">The exception.</param>
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/// <returns>Exception.</returns>
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private Exception GetCancellationException(string url, CancellationToken cancellationToken, OperationCanceledException exception)
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{
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// If the HttpClient's timeout is reached, it will cancel the Task internally
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if (!cancellationToken.IsCancellationRequested)
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{
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var msg = string.Format("Connection to {0} timed out", url);
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_logger.Error(msg);
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// Throw an HttpException so that the caller doesn't think it was cancelled by user code
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return new HttpException(msg, exception) { IsTimedOut = true };
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}
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return exception;
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}
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/// <summary>
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/// Ensures the success status code.
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/// </summary>
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/// <param name="response">The response.</param>
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/// <exception cref="MediaBrowser.Model.Net.HttpException"></exception>
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private void EnsureSuccessStatusCode(HttpResponseMessage response)
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{
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if (!response.IsSuccessStatusCode)
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{
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throw new HttpException(response.ReasonPhrase) { StatusCode = response.StatusCode };
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}
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}
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}
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}
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