mirror of
https://github.com/opensim/opensim.git
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e5367d822b
This integrates the OpenSim refactoring to make physics, etc into modules. AVN physics hasn't been moved to new location. Does not compile yet. Merge branch 'osmaster' into mbworknew1
682 lines
23 KiB
C#
682 lines
23 KiB
C#
/*
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* Copyright (c) Contributors, http://opensimulator.org/
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* See CONTRIBUTORS.TXT for a full list of copyright holders.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of the OpenSimulator Project nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Net;
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using System.Reflection;
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using System.Text;
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using System.Threading;
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using System.Web;
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using log4net;
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using OpenSim.Framework.ServiceAuth;
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namespace OpenSim.Framework
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{
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/// <summary>
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/// Implementation of a generic REST client
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/// </summary>
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/// <remarks>
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/// This class is a generic implementation of a REST (Representational State Transfer) web service. This
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/// class is designed to execute both synchronously and asynchronously.
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///
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/// Internally the implementation works as a two stage asynchronous web-client.
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/// When the request is initiated, RestClient will query asynchronously for for a web-response,
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/// sleeping until the initial response is returned by the server. Once the initial response is retrieved
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/// the second stage of asynchronous requests will be triggered, in an attempt to read of the response
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/// object into a memorystream as a sequence of asynchronous reads.
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///
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/// The asynchronisity of RestClient is designed to move as much processing into the back-ground, allowing
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/// other threads to execute, while it waits for a response from the web-service. RestClient itself can be
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/// invoked by the caller in either synchronous mode or asynchronous modes.
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/// </remarks>
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public class RestClient : IDisposable
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{
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private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
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// private string realuri;
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#region member variables
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/// <summary>
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/// The base Uri of the web-service e.g. http://www.google.com
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/// </summary>
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private string _url;
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/// <summary>
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/// Path elements of the query
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/// </summary>
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private List<string> _pathElements = new List<string>();
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/// <summary>
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/// Parameter elements of the query, e.g. min=34
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/// </summary>
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private Dictionary<string, string> _parameterElements = new Dictionary<string, string>();
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/// <summary>
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/// Request method. E.g. GET, POST, PUT or DELETE
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/// </summary>
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private string _method;
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/// <summary>
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/// Temporary buffer used to store bytes temporarily as they come in from the server
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/// </summary>
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private byte[] _readbuf;
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/// <summary>
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/// MemoryStream representing the resulting resource
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/// </summary>
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private Stream _resource;
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/// <summary>
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/// WebRequest object, held as a member variable
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/// </summary>
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private HttpWebRequest _request;
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/// <summary>
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/// WebResponse object, held as a member variable, so we can close it
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/// </summary>
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private HttpWebResponse _response;
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/// <summary>
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/// This flag will help block the main synchroneous method, in case we run in synchroneous mode
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/// </summary>
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//public static ManualResetEvent _allDone = new ManualResetEvent(false);
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/// <summary>
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/// Default time out period
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/// </summary>
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//private const int DefaultTimeout = 10*1000; // 10 seconds timeout
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/// <summary>
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/// Default Buffer size of a block requested from the web-server
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/// </summary>
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private const int BufferSize = 4096; // Read blocks of 4 KB.
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/// <summary>
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/// if an exception occours during async processing, we need to save it, so it can be
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/// rethrown on the primary thread;
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/// </summary>
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private Exception _asyncException;
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#endregion member variables
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#region constructors
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/// <summary>
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/// Instantiate a new RestClient
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/// </summary>
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/// <param name="url">Web-service to query, e.g. http://osgrid.org:8003</param>
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public RestClient(string url)
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{
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_url = url;
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_readbuf = new byte[BufferSize];
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_resource = new MemoryStream();
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_request = null;
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_response = null;
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_lock = new object();
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}
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private object _lock;
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#endregion constructors
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#region Dispose
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private bool disposed = false;
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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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protected virtual void Dispose(bool disposing)
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{
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if (disposed)
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return;
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if (disposing)
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{
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_resource.Dispose();
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}
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disposed = true;
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}
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#endregion Dispose
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/// <summary>
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/// Add a path element to the query, e.g. assets
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/// </summary>
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/// <param name="element">path entry</param>
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public void AddResourcePath(string element)
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{
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if (isSlashed(element))
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_pathElements.Add(element.Substring(0, element.Length - 1));
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else
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_pathElements.Add(element);
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}
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/// <summary>
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/// Add a query parameter to the Url
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/// </summary>
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/// <param name="name">Name of the parameter, e.g. min</param>
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/// <param name="value">Value of the parameter, e.g. 42</param>
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public void AddQueryParameter(string name, string value)
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{
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try
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{
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_parameterElements.Add(HttpUtility.UrlEncode(name), HttpUtility.UrlEncode(value));
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}
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catch (ArgumentException)
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{
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m_log.Error("[REST]: Query parameter " + name + " is already added.");
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}
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catch (Exception e)
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{
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m_log.Error("[REST]: An exception was raised adding query parameter to dictionary. Exception: {0}",e);
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}
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}
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/// <summary>
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/// Add a query parameter to the Url
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/// </summary>
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/// <param name="name">Name of the parameter, e.g. min</param>
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public void AddQueryParameter(string name)
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{
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try
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{
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_parameterElements.Add(HttpUtility.UrlEncode(name), null);
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}
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catch (ArgumentException)
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{
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m_log.Error("[REST]: Query parameter " + name + " is already added.");
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}
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catch (Exception e)
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{
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m_log.Error("[REST]: An exception was raised adding query parameter to dictionary. Exception: {0}",e);
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}
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}
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/// <summary>
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/// Web-Request method, e.g. GET, PUT, POST, DELETE
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/// </summary>
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public string RequestMethod
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{
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get { return _method; }
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set { _method = value; }
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}
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/// <summary>
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/// True if string contains a trailing slash '/'
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/// </summary>
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/// <param name="s">string to be examined</param>
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/// <returns>true if slash is present</returns>
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private static bool isSlashed(string s)
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{
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return s.Substring(s.Length - 1, 1) == "/";
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}
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/// <summary>
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/// Build a Uri based on the initial Url, path elements and parameters
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/// </summary>
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/// <returns>fully constructed Uri</returns>
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private Uri buildUri()
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{
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StringBuilder sb = new StringBuilder();
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sb.Append(_url);
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foreach (string e in _pathElements)
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{
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sb.Append("/");
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sb.Append(e);
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}
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bool firstElement = true;
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foreach (KeyValuePair<string, string> kv in _parameterElements)
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{
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if (firstElement)
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{
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sb.Append("?");
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firstElement = false;
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}
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else
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sb.Append("&");
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sb.Append(kv.Key);
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if (!string.IsNullOrEmpty(kv.Value))
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{
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sb.Append("=");
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sb.Append(kv.Value);
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}
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}
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// realuri = sb.ToString();
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//m_log.InfoFormat("[REST CLIENT]: RestURL: {0}", realuri);
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return new Uri(sb.ToString());
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}
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#region Async communications with server
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/// <summary>
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/// Async method, invoked when a block of data has been received from the service
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/// </summary>
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/// <param name="ar"></param>
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private void StreamIsReadyDelegate(IAsyncResult ar)
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{
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try
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{
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Stream s = (Stream) ar.AsyncState;
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int read = s.EndRead(ar);
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if (read > 0)
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{
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_resource.Write(_readbuf, 0, read);
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// IAsyncResult asynchronousResult =
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// s.BeginRead(_readbuf, 0, BufferSize, new AsyncCallback(StreamIsReadyDelegate), s);
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s.BeginRead(_readbuf, 0, BufferSize, new AsyncCallback(StreamIsReadyDelegate), s);
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// TODO! Implement timeout, without killing the server
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//ThreadPool.RegisterWaitForSingleObject(asynchronousResult.AsyncWaitHandle, new WaitOrTimerCallback(TimeoutCallback), _request, DefaultTimeout, true);
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}
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else
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{
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s.Close();
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//_allDone.Set();
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}
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}
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catch (Exception e)
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{
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//_allDone.Set();
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_asyncException = e;
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}
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}
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#endregion Async communications with server
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/// <summary>
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/// Perform a synchronous request
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/// </summary>
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public Stream Request()
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{
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return Request(null);
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}
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/// <summary>
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/// Perform a synchronous request
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/// </summary>
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public Stream Request(IServiceAuth auth)
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{
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lock (_lock)
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{
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_request = (HttpWebRequest) WebRequest.Create(buildUri());
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_request.KeepAlive = false;
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_request.ContentType = "application/xml";
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_request.Timeout = 200000;
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_request.Method = RequestMethod;
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_asyncException = null;
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if (auth != null)
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auth.AddAuthorization(_request.Headers);
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int reqnum = WebUtil.RequestNumber++;
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if (WebUtil.DebugLevel >= 3)
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m_log.DebugFormat("[LOGHTTP]: HTTP OUT {0} REST {1} to {2}", reqnum, _request.Method, _request.RequestUri);
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// IAsyncResult responseAsyncResult = _request.BeginGetResponse(new AsyncCallback(ResponseIsReadyDelegate), _request);
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try
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{
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using (_response = (HttpWebResponse) _request.GetResponse())
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{
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using (Stream src = _response.GetResponseStream())
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{
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int length = src.Read(_readbuf, 0, BufferSize);
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while (length > 0)
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{
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_resource.Write(_readbuf, 0, length);
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length = src.Read(_readbuf, 0, BufferSize);
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}
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// TODO! Implement timeout, without killing the server
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// this line implements the timeout, if there is a timeout, the callback fires and the request becomes aborted
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//ThreadPool.RegisterWaitForSingleObject(responseAsyncResult.AsyncWaitHandle, new WaitOrTimerCallback(TimeoutCallback), _request, DefaultTimeout, true);
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// _allDone.WaitOne();
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}
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}
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}
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catch (WebException e)
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{
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using (HttpWebResponse errorResponse = e.Response as HttpWebResponse)
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{
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if (null != errorResponse && HttpStatusCode.NotFound == errorResponse.StatusCode)
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{
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// This is often benign. E.g., requesting a missing asset will return 404.
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m_log.DebugFormat("[REST CLIENT] Resource not found (404): {0}", _request.Address.ToString());
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}
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else
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{
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m_log.Error(string.Format("[REST CLIENT] Error fetching resource from server: {0} ", _request.Address.ToString()), e);
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}
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}
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return null;
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}
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if (_asyncException != null)
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throw _asyncException;
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if (_resource != null)
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{
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_resource.Flush();
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_resource.Seek(0, SeekOrigin.Begin);
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}
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if (WebUtil.DebugLevel >= 5)
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WebUtil.LogResponseDetail(reqnum, _resource);
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return _resource;
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}
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}
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public Stream Request(Stream src, IServiceAuth auth)
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{
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_request = (HttpWebRequest) WebRequest.Create(buildUri());
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_request.KeepAlive = false;
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_request.ContentType = "application/xml";
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_request.Timeout = 90000;
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_request.Method = RequestMethod;
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_asyncException = null;
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_request.ContentLength = src.Length;
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if (auth != null)
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auth.AddAuthorization(_request.Headers);
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src.Seek(0, SeekOrigin.Begin);
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int reqnum = WebUtil.RequestNumber++;
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if (WebUtil.DebugLevel >= 3)
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m_log.DebugFormat("[LOGHTTP]: HTTP OUT {0} REST {1} to {2}", reqnum, _request.Method, _request.RequestUri);
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if (WebUtil.DebugLevel >= 5)
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WebUtil.LogOutgoingDetail(string.Format("SEND {0}: ", reqnum), src);
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using (Stream dst = _request.GetRequestStream())
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{
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m_log.Info("[REST]: GetRequestStream is ok");
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byte[] buf = new byte[1024];
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int length = src.Read(buf, 0, 1024);
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m_log.Info("[REST]: First Read is ok");
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while (length > 0)
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{
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dst.Write(buf, 0, length);
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length = src.Read(buf, 0, 1024);
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}
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}
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try
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{
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_response = (HttpWebResponse)_request.GetResponse();
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}
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catch (WebException e)
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{
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m_log.WarnFormat("[REST]: Request {0} {1} failed with status {2} and message {3}",
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RequestMethod, _request.RequestUri, e.Status, e.Message);
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return null;
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}
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catch (Exception e)
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{
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m_log.WarnFormat(
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"[REST]: Request {0} {1} failed with exception {2} {3}",
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RequestMethod, _request.RequestUri, e.Message, e.StackTrace);
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return null;
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}
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if (WebUtil.DebugLevel >= 5)
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{
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using (Stream responseStream = _response.GetResponseStream())
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{
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using (StreamReader reader = new StreamReader(responseStream))
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{
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string responseStr = reader.ReadToEnd();
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WebUtil.LogResponseDetail(reqnum, responseStr);
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}
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}
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}
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if (_response != null)
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_response.Close();
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// IAsyncResult responseAsyncResult = _request.BeginGetResponse(new AsyncCallback(ResponseIsReadyDelegate), _request);
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// TODO! Implement timeout, without killing the server
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// this line implements the timeout, if there is a timeout, the callback fires and the request becomes aborted
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//ThreadPool.RegisterWaitForSingleObject(responseAsyncResult.AsyncWaitHandle, new WaitOrTimerCallback(TimeoutCallback), _request, DefaultTimeout, true);
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return null;
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}
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#region Async Invocation
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public IAsyncResult BeginRequest(AsyncCallback callback, object state)
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{
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/// <summary>
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/// In case, we are invoked asynchroneously this object will keep track of the state
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/// </summary>
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AsyncResult<Stream> ar = new AsyncResult<Stream>(callback, state);
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Util.FireAndForget(RequestHelper, ar, "RestClient.BeginRequest");
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return ar;
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}
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public Stream EndRequest(IAsyncResult asyncResult)
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{
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AsyncResult<Stream> ar = (AsyncResult<Stream>) asyncResult;
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// Wait for operation to complete, then return result or
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// throw exception
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return ar.EndInvoke();
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}
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private void RequestHelper(Object asyncResult)
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{
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// We know that it's really an AsyncResult<DateTime> object
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AsyncResult<Stream> ar = (AsyncResult<Stream>) asyncResult;
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try
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{
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// Perform the operation; if sucessful set the result
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Stream s = Request(null);
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ar.SetAsCompleted(s, false);
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}
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catch (Exception e)
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{
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// If operation fails, set the exception
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ar.HandleException(e, false);
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}
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}
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#endregion Async Invocation
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}
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internal class SimpleAsyncResult : IAsyncResult
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{
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private readonly AsyncCallback m_callback;
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/// <summary>
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/// Is process completed?
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/// </summary>
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/// <remarks>Should really be boolean, but VolatileRead has no boolean method</remarks>
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private byte m_completed;
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/// <summary>
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/// Did process complete synchronously?
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/// </summary>
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/// <remarks>I have a hard time imagining a scenario where this is the case, again, same issue about
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/// booleans and VolatileRead as m_completed
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/// </remarks>
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private byte m_completedSynchronously;
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private readonly object m_asyncState;
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private ManualResetEvent m_waitHandle;
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private Exception m_exception;
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internal SimpleAsyncResult(AsyncCallback cb, object state)
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{
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m_callback = cb;
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m_asyncState = state;
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m_completed = 0;
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m_completedSynchronously = 1;
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}
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#region IAsyncResult Members
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public object AsyncState
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{
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|
get { return m_asyncState; }
|
|
}
|
|
|
|
public WaitHandle AsyncWaitHandle
|
|
{
|
|
get
|
|
{
|
|
if (m_waitHandle == null)
|
|
{
|
|
bool done = IsCompleted;
|
|
ManualResetEvent mre = new ManualResetEvent(done);
|
|
if (Interlocked.CompareExchange(ref m_waitHandle, mre, null) != null)
|
|
{
|
|
mre.Close();
|
|
}
|
|
else
|
|
{
|
|
if (!done && IsCompleted)
|
|
{
|
|
m_waitHandle.Set();
|
|
}
|
|
}
|
|
}
|
|
|
|
return m_waitHandle;
|
|
}
|
|
}
|
|
|
|
|
|
public bool CompletedSynchronously
|
|
{
|
|
get { return Thread.VolatileRead(ref m_completedSynchronously) == 1; }
|
|
}
|
|
|
|
|
|
public bool IsCompleted
|
|
{
|
|
get { return Thread.VolatileRead(ref m_completed) == 1; }
|
|
}
|
|
|
|
#endregion
|
|
|
|
#region class Methods
|
|
|
|
internal void SetAsCompleted(bool completedSynchronously)
|
|
{
|
|
m_completed = 1;
|
|
if (completedSynchronously)
|
|
m_completedSynchronously = 1;
|
|
else
|
|
m_completedSynchronously = 0;
|
|
|
|
SignalCompletion();
|
|
}
|
|
|
|
internal void HandleException(Exception e, bool completedSynchronously)
|
|
{
|
|
m_completed = 1;
|
|
if (completedSynchronously)
|
|
m_completedSynchronously = 1;
|
|
else
|
|
m_completedSynchronously = 0;
|
|
m_exception = e;
|
|
|
|
SignalCompletion();
|
|
}
|
|
|
|
private void SignalCompletion()
|
|
{
|
|
if (m_waitHandle != null) m_waitHandle.Set();
|
|
|
|
if (m_callback != null) m_callback(this);
|
|
}
|
|
|
|
public void EndInvoke()
|
|
{
|
|
// This method assumes that only 1 thread calls EndInvoke
|
|
if (!IsCompleted)
|
|
{
|
|
// If the operation isn't done, wait for it
|
|
AsyncWaitHandle.WaitOne();
|
|
AsyncWaitHandle.Close();
|
|
m_waitHandle.Close();
|
|
m_waitHandle = null; // Allow early GC
|
|
}
|
|
|
|
// Operation is done: if an exception occured, throw it
|
|
if (m_exception != null) throw m_exception;
|
|
}
|
|
|
|
#endregion
|
|
}
|
|
|
|
internal class AsyncResult<T> : SimpleAsyncResult
|
|
{
|
|
private T m_result = default(T);
|
|
|
|
public AsyncResult(AsyncCallback asyncCallback, Object state) :
|
|
base(asyncCallback, state)
|
|
{
|
|
}
|
|
|
|
public void SetAsCompleted(T result, bool completedSynchronously)
|
|
{
|
|
// Save the asynchronous operation's result
|
|
m_result = result;
|
|
|
|
// Tell the base class that the operation completed
|
|
// sucessfully (no exception)
|
|
base.SetAsCompleted(completedSynchronously);
|
|
}
|
|
|
|
public new T EndInvoke()
|
|
{
|
|
base.EndInvoke();
|
|
return m_result;
|
|
}
|
|
}
|
|
|
|
}
|