jellyfin/MediaBrowser.Common.Implementations/HttpClientManager/HttpClientManager.cs
2014-07-16 23:17:14 -04:00

718 lines
25 KiB
C#

using MediaBrowser.Common.Configuration;
using MediaBrowser.Common.IO;
using MediaBrowser.Common.Net;
using MediaBrowser.Model.Logging;
using MediaBrowser.Model.Net;
using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Globalization;
using System.IO;
using System.Linq;
using System.Net;
using System.Net.Cache;
using System.Net.Http;
using System.Reflection;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
namespace MediaBrowser.Common.Implementations.HttpClientManager
{
/// <summary>
/// Class HttpClientManager
/// </summary>
public class HttpClientManager : IHttpClient
{
/// <summary>
/// When one request to a host times out, we'll ban all other requests for this period of time, to prevent scans from stalling
/// </summary>
private const int TimeoutSeconds = 30;
/// <summary>
/// The _logger
/// </summary>
private readonly ILogger _logger;
/// <summary>
/// The _app paths
/// </summary>
private readonly IApplicationPaths _appPaths;
private readonly IFileSystem _fileSystem;
private readonly IConfigurationManager _config;
/// <summary>
/// Initializes a new instance of the <see cref="HttpClientManager" /> class.
/// </summary>
/// <param name="appPaths">The app paths.</param>
/// <param name="logger">The logger.</param>
/// <param name="fileSystem">The file system.</param>
/// <exception cref="System.ArgumentNullException">appPaths
/// or
/// logger</exception>
public HttpClientManager(IApplicationPaths appPaths, ILogger logger, IFileSystem fileSystem, IConfigurationManager config)
{
if (appPaths == null)
{
throw new ArgumentNullException("appPaths");
}
if (logger == null)
{
throw new ArgumentNullException("logger");
}
_logger = logger;
_fileSystem = fileSystem;
_config = config;
_appPaths = appPaths;
// http://stackoverflow.com/questions/566437/http-post-returns-the-error-417-expectation-failed-c
ServicePointManager.Expect100Continue = false;
}
/// <summary>
/// Holds a dictionary of http clients by host. Use GetHttpClient(host) to retrieve or create a client for web requests.
/// DON'T dispose it after use.
/// </summary>
/// <value>The HTTP clients.</value>
private readonly ConcurrentDictionary<string, HttpClientInfo> _httpClients = new ConcurrentDictionary<string, HttpClientInfo>();
/// <summary>
/// Gets
/// </summary>
/// <param name="host">The host.</param>
/// <param name="enableHttpCompression">if set to <c>true</c> [enable HTTP compression].</param>
/// <returns>HttpClient.</returns>
/// <exception cref="System.ArgumentNullException">host</exception>
private HttpClientInfo GetHttpClient(string host, bool enableHttpCompression)
{
if (string.IsNullOrEmpty(host))
{
throw new ArgumentNullException("host");
}
HttpClientInfo client;
var key = host + enableHttpCompression;
if (!_httpClients.TryGetValue(key, out client))
{
client = new HttpClientInfo();
_httpClients.TryAdd(key, client);
}
return client;
}
private WebRequest GetRequest(HttpRequestOptions options, string method, bool enableHttpCompression)
{
var request = (HttpWebRequest)WebRequest.Create(options.Url);
AddRequestHeaders(request, options);
request.AutomaticDecompression = enableHttpCompression ? DecompressionMethods.Deflate : DecompressionMethods.None;
request.CachePolicy = new RequestCachePolicy(RequestCacheLevel.BypassCache);
if (options.EnableKeepAlive)
{
request.KeepAlive = true;
}
request.Method = method;
request.Pipelined = true;
request.Timeout = 20000;
if (!string.IsNullOrEmpty(options.Host))
{
request.Host = options.Host;
}
if (!string.IsNullOrEmpty(options.Referer))
{
request.Referer = options.Referer;
}
return request;
}
private void AddRequestHeaders(HttpWebRequest request, HttpRequestOptions options)
{
foreach (var header in options.RequestHeaders.ToList())
{
if (string.Equals(header.Key, "Accept", StringComparison.OrdinalIgnoreCase))
{
request.Accept = header.Value;
}
else if (string.Equals(header.Key, "User-Agent", StringComparison.OrdinalIgnoreCase))
{
request.UserAgent = header.Value;
}
else
{
request.Headers.Set(header.Key, header.Value);
}
}
}
/// <summary>
/// Gets the response internal.
/// </summary>
/// <param name="options">The options.</param>
/// <returns>Task{HttpResponseInfo}.</returns>
public Task<HttpResponseInfo> GetResponse(HttpRequestOptions options)
{
return SendAsync(options, "GET");
}
/// <summary>
/// Performs a GET request and returns the resulting stream
/// </summary>
/// <param name="options">The options.</param>
/// <returns>Task{Stream}.</returns>
public async Task<Stream> Get(HttpRequestOptions options)
{
var response = await GetResponse(options).ConfigureAwait(false);
return response.Content;
}
/// <summary>
/// Performs a GET request and returns the resulting stream
/// </summary>
/// <param name="url">The URL.</param>
/// <param name="resourcePool">The resource pool.</param>
/// <param name="cancellationToken">The cancellation token.</param>
/// <returns>Task{Stream}.</returns>
public Task<Stream> Get(string url, SemaphoreSlim resourcePool, CancellationToken cancellationToken)
{
return Get(new HttpRequestOptions
{
Url = url,
ResourcePool = resourcePool,
CancellationToken = cancellationToken,
});
}
/// <summary>
/// Gets the specified URL.
/// </summary>
/// <param name="url">The URL.</param>
/// <param name="cancellationToken">The cancellation token.</param>
/// <returns>Task{Stream}.</returns>
public Task<Stream> Get(string url, CancellationToken cancellationToken)
{
return Get(url, null, cancellationToken);
}
/// <summary>
/// send as an asynchronous operation.
/// </summary>
/// <param name="options">The options.</param>
/// <param name="httpMethod">The HTTP method.</param>
/// <returns>Task{HttpResponseInfo}.</returns>
/// <exception cref="HttpException">
/// </exception>
public async Task<HttpResponseInfo> SendAsync(HttpRequestOptions options, string httpMethod)
{
ValidateParams(options);
options.CancellationToken.ThrowIfCancellationRequested();
var client = GetHttpClient(GetHostFromUrl(options.Url), options.EnableHttpCompression);
if ((DateTime.UtcNow - client.LastTimeout).TotalSeconds < TimeoutSeconds)
{
throw new HttpException(string.Format("Cancelling connection to {0} due to a previous timeout.", options.Url)) { IsTimedOut = true };
}
var httpWebRequest = GetRequest(options, httpMethod, options.EnableHttpCompression);
if (options.RequestContentBytes != null ||
!string.IsNullOrEmpty(options.RequestContent) ||
string.Equals(httpMethod, "post", StringComparison.OrdinalIgnoreCase))
{
var bytes = options.RequestContentBytes ??
Encoding.UTF8.GetBytes(options.RequestContent ?? string.Empty);
httpWebRequest.ContentType = options.RequestContentType ?? "application/x-www-form-urlencoded";
httpWebRequest.ContentLength = bytes.Length;
httpWebRequest.GetRequestStream().Write(bytes, 0, bytes.Length);
}
if (options.ResourcePool != null)
{
await options.ResourcePool.WaitAsync(options.CancellationToken).ConfigureAwait(false);
}
if ((DateTime.UtcNow - client.LastTimeout).TotalSeconds < TimeoutSeconds)
{
if (options.ResourcePool != null)
{
options.ResourcePool.Release();
}
throw new HttpException(string.Format("Connection to {0} timed out", options.Url)) { IsTimedOut = true };
}
if (options.LogRequest)
{
_logger.Info("HttpClientManager {0}: {1}", httpMethod.ToUpper(), options.Url);
}
try
{
options.CancellationToken.ThrowIfCancellationRequested();
if (!options.BufferContent)
{
var response = await httpWebRequest.GetResponseAsync().ConfigureAwait(false);
var httpResponse = (HttpWebResponse)response;
EnsureSuccessStatusCode(httpResponse, options);
options.CancellationToken.ThrowIfCancellationRequested();
return GetResponseInfo(httpResponse, httpResponse.GetResponseStream(), GetContentLength(httpResponse));
}
using (var response = await httpWebRequest.GetResponseAsync().ConfigureAwait(false))
{
var httpResponse = (HttpWebResponse)response;
EnsureSuccessStatusCode(httpResponse, options);
options.CancellationToken.ThrowIfCancellationRequested();
using (var stream = httpResponse.GetResponseStream())
{
var memoryStream = new MemoryStream();
await stream.CopyToAsync(memoryStream).ConfigureAwait(false);
memoryStream.Position = 0;
return GetResponseInfo(httpResponse, memoryStream, memoryStream.Length);
}
}
}
catch (OperationCanceledException ex)
{
var exception = GetCancellationException(options.Url, options.CancellationToken, ex);
var httpException = exception as HttpException;
if (httpException != null && httpException.IsTimedOut)
{
client.LastTimeout = DateTime.UtcNow;
}
throw exception;
}
catch (HttpRequestException ex)
{
_logger.ErrorException("Error getting response from " + options.Url, ex);
throw new HttpException(ex.Message, ex);
}
catch (WebException ex)
{
throw GetException(ex, options);
}
catch (Exception ex)
{
_logger.ErrorException("Error getting response from " + options.Url, ex);
throw;
}
finally
{
if (options.ResourcePool != null)
{
options.ResourcePool.Release();
}
}
}
/// <summary>
/// Gets the exception.
/// </summary>
/// <param name="ex">The ex.</param>
/// <param name="options">The options.</param>
/// <returns>HttpException.</returns>
private HttpException GetException(WebException ex, HttpRequestOptions options)
{
_logger.ErrorException("Error getting response from " + options.Url, ex);
return new HttpException(ex.Message, ex);
}
private HttpResponseInfo GetResponseInfo(HttpWebResponse httpResponse, Stream content, long? contentLength)
{
return new HttpResponseInfo
{
Content = content,
StatusCode = httpResponse.StatusCode,
ContentType = httpResponse.ContentType,
Headers = new NameValueCollection(httpResponse.Headers),
ContentLength = contentLength,
ResponseUrl = httpResponse.ResponseUri.ToString()
};
}
private HttpResponseInfo GetResponseInfo(HttpWebResponse httpResponse, string tempFile, long? contentLength)
{
return new HttpResponseInfo
{
TempFilePath = tempFile,
StatusCode = httpResponse.StatusCode,
ContentType = httpResponse.ContentType,
Headers = httpResponse.Headers,
ContentLength = contentLength
};
}
public Task<HttpResponseInfo> Post(HttpRequestOptions options)
{
return SendAsync(options, "POST");
}
/// <summary>
/// Performs a POST request
/// </summary>
/// <param name="options">The options.</param>
/// <param name="postData">Params to add to the POST data.</param>
/// <returns>stream on success, null on failure</returns>
public async Task<Stream> Post(HttpRequestOptions options, Dictionary<string, string> postData)
{
var strings = postData.Keys.Select(key => string.Format("{0}={1}", key, postData[key]));
var postContent = string.Join("&", strings.ToArray());
options.RequestContent = postContent;
options.RequestContentType = "application/x-www-form-urlencoded";
var response = await Post(options).ConfigureAwait(false);
return response.Content;
}
/// <summary>
/// Performs a POST request
/// </summary>
/// <param name="url">The URL.</param>
/// <param name="postData">Params to add to the POST data.</param>
/// <param name="resourcePool">The resource pool.</param>
/// <param name="cancellationToken">The cancellation token.</param>
/// <returns>stream on success, null on failure</returns>
public Task<Stream> Post(string url, Dictionary<string, string> postData, SemaphoreSlim resourcePool, CancellationToken cancellationToken)
{
return Post(new HttpRequestOptions
{
Url = url,
ResourcePool = resourcePool,
CancellationToken = cancellationToken
}, postData);
}
/// <summary>
/// Downloads the contents of a given url into a temporary location
/// </summary>
/// <param name="options">The options.</param>
/// <returns>Task{System.String}.</returns>
/// <exception cref="System.ArgumentNullException">progress</exception>
public async Task<string> GetTempFile(HttpRequestOptions options)
{
var response = await GetTempFileResponse(options).ConfigureAwait(false);
return response.TempFilePath;
}
public async Task<HttpResponseInfo> GetTempFileResponse(HttpRequestOptions options)
{
ValidateParams(options);
Directory.CreateDirectory(_appPaths.TempDirectory);
var tempFile = Path.Combine(_appPaths.TempDirectory, Guid.NewGuid() + ".tmp");
if (options.Progress == null)
{
throw new ArgumentNullException("progress");
}
options.CancellationToken.ThrowIfCancellationRequested();
var httpWebRequest = GetRequest(options, "GET", options.EnableHttpCompression);
if (options.ResourcePool != null)
{
await options.ResourcePool.WaitAsync(options.CancellationToken).ConfigureAwait(false);
}
options.Progress.Report(0);
if (options.LogRequest)
{
_logger.Info("HttpClientManager.GetTempFileResponse url: {0}", options.Url);
}
try
{
options.CancellationToken.ThrowIfCancellationRequested();
using (var response = await httpWebRequest.GetResponseAsync().ConfigureAwait(false))
{
var httpResponse = (HttpWebResponse)response;
EnsureSuccessStatusCode(httpResponse, options);
options.CancellationToken.ThrowIfCancellationRequested();
var contentLength = GetContentLength(httpResponse);
if (!contentLength.HasValue)
{
// We're not able to track progress
using (var stream = httpResponse.GetResponseStream())
{
using (var fs = _fileSystem.GetFileStream(tempFile, FileMode.Create, FileAccess.Write, FileShare.Read, true))
{
await stream.CopyToAsync(fs, StreamDefaults.DefaultCopyToBufferSize, options.CancellationToken).ConfigureAwait(false);
}
}
}
else
{
using (var stream = ProgressStream.CreateReadProgressStream(httpResponse.GetResponseStream(), options.Progress.Report, contentLength.Value))
{
using (var fs = _fileSystem.GetFileStream(tempFile, FileMode.Create, FileAccess.Write, FileShare.Read, true))
{
await stream.CopyToAsync(fs, StreamDefaults.DefaultCopyToBufferSize, options.CancellationToken).ConfigureAwait(false);
}
}
}
options.Progress.Report(100);
return GetResponseInfo(httpResponse, tempFile, contentLength);
}
}
catch (OperationCanceledException ex)
{
throw GetTempFileException(ex, options, tempFile);
}
catch (HttpRequestException ex)
{
throw GetTempFileException(ex, options, tempFile);
}
catch (WebException ex)
{
throw GetTempFileException(ex, options, tempFile);
}
catch (Exception ex)
{
throw GetTempFileException(ex, options, tempFile);
}
finally
{
if (options.ResourcePool != null)
{
options.ResourcePool.Release();
}
}
}
private long? GetContentLength(HttpWebResponse response)
{
var length = response.ContentLength;
if (length == 0)
{
return null;
}
return length;
}
protected static readonly CultureInfo UsCulture = new CultureInfo("en-US");
/// <summary>
/// Handles the temp file exception.
/// </summary>
/// <param name="ex">The ex.</param>
/// <param name="options">The options.</param>
/// <param name="tempFile">The temp file.</param>
/// <returns>Task.</returns>
/// <exception cref="HttpException"></exception>
private Exception GetTempFileException(Exception ex, HttpRequestOptions options, string tempFile)
{
var operationCanceledException = ex as OperationCanceledException;
if (operationCanceledException != null)
{
// Cleanup
DeleteTempFile(tempFile);
return GetCancellationException(options.Url, options.CancellationToken, operationCanceledException);
}
_logger.ErrorException("Error getting response from " + options.Url, ex);
// Cleanup
DeleteTempFile(tempFile);
var httpRequestException = ex as HttpRequestException;
if (httpRequestException != null)
{
return new HttpException(ex.Message, ex);
}
var webException = ex as WebException;
if (webException != null)
{
throw GetException(webException, options);
}
return ex;
}
private void DeleteTempFile(string file)
{
try
{
File.Delete(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("options");
}
}
/// <summary>
/// Gets the host from URL.
/// </summary>
/// <param name="url">The URL.</param>
/// <returns>System.String.</returns>
private string GetHostFromUrl(string url)
{
var start = url.IndexOf("://", StringComparison.OrdinalIgnoreCase) + 3;
var len = url.IndexOf('/', start) - start;
return url.Substring(start, len);
}
/// <summary>
/// Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.
/// </summary>
public void Dispose()
{
Dispose(true);
GC.SuppressFinalize(this);
}
/// <summary>
/// Releases unmanaged and - optionally - managed resources.
/// </summary>
/// <param name="dispose"><c>true</c> to release both managed and unmanaged resources; <c>false</c> to release only unmanaged resources.</param>
protected virtual void Dispose(bool dispose)
{
if (dispose)
{
_httpClients.Clear();
}
}
/// <summary>
/// Throws the cancellation exception.
/// </summary>
/// <param name="url">The URL.</param>
/// <param name="cancellationToken">The cancellation token.</param>
/// <param name="exception">The exception.</param>
/// <returns>Exception.</returns>
private Exception GetCancellationException(string url, 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", url);
_logger.Error(msg);
// 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(HttpWebResponse response, HttpRequestOptions options)
{
var statusCode = response.StatusCode;
var isSuccessful = statusCode >= HttpStatusCode.OK && statusCode <= (HttpStatusCode)299;
if (!isSuccessful)
{
if (options.LogErrorResponseBody)
{
try
{
using (var stream = response.GetResponseStream())
{
if (stream != null)
{
using (var reader = new StreamReader(stream))
{
var msg = reader.ReadToEnd();
_logger.Error(msg);
}
}
}
}
catch
{
}
}
throw new HttpException(response.StatusDescription) { StatusCode = response.StatusCode };
}
}
/// <summary>
/// Posts the specified URL.
/// </summary>
/// <param name="url">The URL.</param>
/// <param name="postData">The post data.</param>
/// <param name="cancellationToken">The cancellation token.</param>
/// <returns>Task{Stream}.</returns>
public Task<Stream> Post(string url, Dictionary<string, string> postData, CancellationToken cancellationToken)
{
return Post(url, postData, null, cancellationToken);
}
}
}