jellyfin-server/MediaBrowser.Common.Implementations/HttpClientManager/HttpClientManager.cs
2013-09-19 20:53:18 -04:00

647 lines
24 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.Globalization;
using System.IO;
using System.Linq;
using System.Net.Http;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
namespace MediaBrowser.Common.Implementations.HttpClientManager
{
/// <summary>
/// Class HttpClientManager
/// </summary>
public class HttpClientManager : IHttpClient
{
/// <summary>
/// The _logger
/// </summary>
private readonly ILogger _logger;
/// <summary>
/// The _app paths
/// </summary>
private readonly IApplicationPaths _appPaths;
public delegate HttpMessageHandler GetHttpMessageHandler(bool enableHttpCompression);
private readonly GetHttpMessageHandler _getHttpMessageHandler;
/// <summary>
/// Initializes a new instance of the <see cref="HttpClientManager" /> class.
/// </summary>
/// <param name="appPaths">The kernel.</param>
/// <param name="logger">The logger.</param>
/// <exception cref="System.ArgumentNullException">
/// appPaths
/// or
/// logger
/// </exception>
public HttpClientManager(IApplicationPaths appPaths, ILogger logger, GetHttpMessageHandler getHttpMessageHandler)
{
if (appPaths == null)
{
throw new ArgumentNullException("appPaths");
}
if (logger == null)
{
throw new ArgumentNullException("logger");
}
_logger = logger;
_getHttpMessageHandler = getHttpMessageHandler;
_appPaths = appPaths;
}
/// <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
{
HttpClient = new HttpClient(_getHttpMessageHandler(enableHttpCompression))
{
Timeout = TimeSpan.FromSeconds(20)
}
};
_httpClients.TryAdd(key, client);
}
return client;
}
public async Task<HttpResponseInfo> GetResponse(HttpRequestOptions options)
{
ValidateParams(options.Url, options.CancellationToken);
options.CancellationToken.ThrowIfCancellationRequested();
var client = GetHttpClient(GetHostFromUrl(options.Url), options.EnableHttpCompression);
if ((DateTime.UtcNow - client.LastTimeout).TotalSeconds < 30)
{
throw new HttpException(string.Format("Cancelling connection to {0} due to a previous timeout.", options.Url)) { IsTimedOut = true };
}
using (var message = GetHttpRequestMessage(options))
{
if (options.ResourcePool != null)
{
await options.ResourcePool.WaitAsync(options.CancellationToken).ConfigureAwait(false);
}
if ((DateTime.UtcNow - client.LastTimeout).TotalSeconds < 30)
{
if (options.ResourcePool != null)
{
options.ResourcePool.Release();
}
throw new HttpException(string.Format("Connection to {0} timed out", options.Url)) { IsTimedOut = true };
}
_logger.Info("HttpClientManager.Get url: {0}", options.Url);
try
{
options.CancellationToken.ThrowIfCancellationRequested();
var response = await client.HttpClient.SendAsync(message, HttpCompletionOption.ResponseContentRead, options.CancellationToken).ConfigureAwait(false);
EnsureSuccessStatusCode(response);
options.CancellationToken.ThrowIfCancellationRequested();
return new HttpResponseInfo
{
Content = await response.Content.ReadAsStreamAsync().ConfigureAwait(false),
StatusCode = response.StatusCode,
ContentType = response.Content.Headers.ContentType.MediaType
};
}
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 (Exception ex)
{
_logger.ErrorException("Error getting response from " + options.Url, ex);
throw;
}
finally
{
if (options.ResourcePool != null)
{
options.ResourcePool.Release();
}
}
}
}
/// <summary>
/// Performs a GET request and returns the resulting stream
/// </summary>
/// <param name="options">The options.</param>
/// <returns>Task{Stream}.</returns>
/// <exception cref="HttpException"></exception>
/// <exception cref="MediaBrowser.Model.Net.HttpException"></exception>
public async Task<Stream> Get(HttpRequestOptions options)
{
ValidateParams(options.Url, options.CancellationToken);
options.CancellationToken.ThrowIfCancellationRequested();
var client = GetHttpClient(GetHostFromUrl(options.Url), options.EnableHttpCompression);
if ((DateTime.UtcNow - client.LastTimeout).TotalSeconds < 30)
{
throw new HttpException(string.Format("Cancelling connection to {0} due to a previous timeout.", options.Url)) { IsTimedOut = true };
}
using (var message = GetHttpRequestMessage(options))
{
if (options.ResourcePool != null)
{
await options.ResourcePool.WaitAsync(options.CancellationToken).ConfigureAwait(false);
}
if ((DateTime.UtcNow - client.LastTimeout).TotalSeconds < 30)
{
if (options.ResourcePool != null)
{
options.ResourcePool.Release();
}
throw new HttpException(string.Format("Connection to {0} timed out", options.Url)) { IsTimedOut = true };
}
_logger.Info("HttpClientManager.Get url: {0}", options.Url);
try
{
options.CancellationToken.ThrowIfCancellationRequested();
var response = await client.HttpClient.SendAsync(message, HttpCompletionOption.ResponseContentRead, options.CancellationToken).ConfigureAwait(false);
EnsureSuccessStatusCode(response);
options.CancellationToken.ThrowIfCancellationRequested();
return await response.Content.ReadAsStreamAsync().ConfigureAwait(false);
}
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 (Exception ex)
{
_logger.ErrorException("Error getting response from " + options.Url, ex);
throw;
}
finally
{
if (options.ResourcePool != null)
{
options.ResourcePool.Release();
}
}
}
}
/// <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>
/// 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>
/// <exception cref="System.ArgumentNullException">postData</exception>
/// <exception cref="MediaBrowser.Model.Net.HttpException"></exception>
public async Task<Stream> Post(string url, Dictionary<string, string> postData, SemaphoreSlim resourcePool, CancellationToken cancellationToken)
{
ValidateParams(url, cancellationToken);
if (postData == null)
{
throw new ArgumentNullException("postData");
}
cancellationToken.ThrowIfCancellationRequested();
var strings = postData.Keys.Select(key => string.Format("{0}={1}", key, postData[key]));
var postContent = string.Join("&", strings.ToArray());
var content = new StringContent(postContent, Encoding.UTF8, "application/x-www-form-urlencoded");
if (resourcePool != null)
{
await resourcePool.WaitAsync(cancellationToken).ConfigureAwait(false);
}
_logger.Info("HttpClientManager.Post url: {0}", url);
try
{
cancellationToken.ThrowIfCancellationRequested();
var msg = await GetHttpClient(GetHostFromUrl(url), true).HttpClient.PostAsync(url, content, cancellationToken).ConfigureAwait(false);
EnsureSuccessStatusCode(msg);
return await msg.Content.ReadAsStreamAsync().ConfigureAwait(false);
}
catch (OperationCanceledException ex)
{
throw GetCancellationException(url, cancellationToken, ex);
}
catch (HttpRequestException ex)
{
_logger.ErrorException("Error getting response from " + url, ex);
throw new HttpException(ex.Message, ex);
}
finally
{
if (resourcePool != null)
{
resourcePool.Release();
}
}
}
/// <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>
/// <exception cref="HttpException"></exception>
/// <exception cref="MediaBrowser.Model.Net.HttpException"></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.Url, options.CancellationToken);
var tempFile = Path.Combine(_appPaths.TempDirectory, Guid.NewGuid() + ".tmp");
if (options.Progress == null)
{
throw new ArgumentNullException("progress");
}
options.CancellationToken.ThrowIfCancellationRequested();
if (options.ResourcePool != null)
{
await options.ResourcePool.WaitAsync(options.CancellationToken).ConfigureAwait(false);
}
options.Progress.Report(0);
_logger.Info("HttpClientManager.GetTempFile url: {0}, temp file: {1}", options.Url, tempFile);
try
{
options.CancellationToken.ThrowIfCancellationRequested();
using (var message = GetHttpRequestMessage(options))
{
using (var response = await GetHttpClient(GetHostFromUrl(options.Url), options.EnableHttpCompression).HttpClient.SendAsync(message, HttpCompletionOption.ResponseHeadersRead, options.CancellationToken).ConfigureAwait(false))
{
EnsureSuccessStatusCode(response);
options.CancellationToken.ThrowIfCancellationRequested();
var contentLength = GetContentLength(response);
if (!contentLength.HasValue)
{
// We're not able to track progress
using (var stream = await response.Content.ReadAsStreamAsync().ConfigureAwait(false))
{
using (var fs = new FileStream(tempFile, FileMode.Create, FileAccess.Write, FileShare.Read, StreamDefaults.DefaultFileStreamBufferSize, FileOptions.Asynchronous))
{
await stream.CopyToAsync(fs, StreamDefaults.DefaultCopyToBufferSize, options.CancellationToken).ConfigureAwait(false);
}
}
}
else
{
using (var stream = ProgressStream.CreateReadProgressStream(await response.Content.ReadAsStreamAsync().ConfigureAwait(false), options.Progress.Report, contentLength.Value))
{
using (var fs = new FileStream(tempFile, FileMode.Create, FileAccess.Write, FileShare.Read, StreamDefaults.DefaultFileStreamBufferSize, FileOptions.Asynchronous))
{
await stream.CopyToAsync(fs, StreamDefaults.DefaultCopyToBufferSize, options.CancellationToken).ConfigureAwait(false);
}
}
}
options.Progress.Report(100);
return new HttpResponseInfo
{
TempFilePath = tempFile,
StatusCode = response.StatusCode,
ContentType = response.Content.Headers.ContentType.MediaType
};
}
}
}
catch (Exception ex)
{
throw GetTempFileException(ex, options, tempFile);
}
finally
{
if (options.ResourcePool != null)
{
options.ResourcePool.Release();
}
}
}
/// <summary>
/// Gets the message.
/// </summary>
/// <param name="options">The options.</param>
/// <returns>HttpResponseMessage.</returns>
private HttpRequestMessage GetHttpRequestMessage(HttpRequestOptions options)
{
var message = new HttpRequestMessage(HttpMethod.Get, options.Url);
foreach (var pair in options.RequestHeaders.ToList())
{
message.Headers.Add(pair.Key, pair.Value);
}
return message;
}
/// <summary>
/// Gets the length of the content.
/// </summary>
/// <param name="response">The response.</param>
/// <returns>System.Nullable{System.Int64}.</returns>
private long? GetContentLength(HttpResponseMessage response)
{
IEnumerable<string> lengthValues;
if (!response.Headers.TryGetValues("content-length", out lengthValues) && !response.Content.Headers.TryGetValues("content-length", out lengthValues))
{
return null;
}
return long.Parse(string.Join(string.Empty, lengthValues.ToArray()), UsCulture);
}
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
if (File.Exists(tempFile))
{
File.Delete(tempFile);
}
return GetCancellationException(options.Url, options.CancellationToken, operationCanceledException);
}
_logger.ErrorException("Error getting response from " + options.Url, ex);
var httpRequestException = ex as HttpRequestException;
// Cleanup
if (File.Exists(tempFile))
{
File.Delete(tempFile);
}
if (httpRequestException != null)
{
return new HttpException(ex.Message, ex);
}
return ex;
}
/// <summary>
/// Validates the params.
/// </summary>
/// <param name="url">The URL.</param>
/// <param name="cancellationToken">The cancellation token.</param>
/// <exception cref="System.ArgumentNullException">url</exception>
private void ValidateParams(string url, CancellationToken cancellationToken)
{
if (string.IsNullOrEmpty(url))
{
throw new ArgumentNullException("url");
}
if (cancellationToken == null)
{
throw new ArgumentNullException("cancellationToken");
}
}
/// <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)
{
foreach (var client in _httpClients.Values.ToList())
{
client.HttpClient.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;
}
/// <summary>
/// Ensures the success status code.
/// </summary>
/// <param name="response">The response.</param>
/// <exception cref="MediaBrowser.Model.Net.HttpException"></exception>
private void EnsureSuccessStatusCode(HttpResponseMessage response)
{
if (!response.IsSuccessStatusCode)
{
throw new HttpException(response.ReasonPhrase) { 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);
}
}
}