* Adding request time limiting strategy for texture requests, though this isn't useable yet
Justin Clarke Casey
parent
6ef4f1bdae
commit
5fe4a39927
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@ -80,7 +80,7 @@ namespace OpenSim.Framework.Communications.Limit
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/// </summary>
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public bool IsFirstRefusal(TId id)
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{
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if (m_maxRequests + 1 == requestCounts[id])
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if (requestCounts.ContainsKey(id) && m_maxRequests + 1 == requestCounts[id])
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{
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return true;
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}
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@ -0,0 +1,140 @@
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/*
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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 OpenSim 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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namespace OpenSim.Framework.Communications.Limit
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{
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/// <summary>
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/// Limit requests by discarding repeat attempts that occur within a given time period
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///
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/// XXX Don't use this for limiting texture downloading, at least not until we better handle multiple requests
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/// for the same texture at different resolutions.
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/// </summary>
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public class TimeLimitStrategy<TId> : IRequestLimitStrategy<TId>
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{
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/// <summary>
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/// Record the time at which an asset request occurs.
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/// </summary>
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private readonly Dictionary<TId, Request> requests = new Dictionary<TId, Request>();
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/// <summary>
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/// The minimum time period between which requests for the same data will be serviced.
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/// </summary>
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private readonly TimeSpan m_repeatPeriod;
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public TimeSpan RepeatPeriod
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{
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get { return m_repeatPeriod; }
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}
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/// <summary></summary>
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/// <param name="repeatPeriod"></param>
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public TimeLimitStrategy(TimeSpan repeatPeriod)
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{
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m_repeatPeriod = repeatPeriod;
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}
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/// <summary>
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/// <see cref="IRequestLimitStrategy"/>
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/// </summary>
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public bool AllowRequest(TId id)
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{
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if (IsMonitoringRequests(id))
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{
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DateTime now = DateTime.Now;
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TimeSpan elapsed = now - requests[id].Time;
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if (elapsed < RepeatPeriod)
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{
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requests[id].Refusals += 1;
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return false;
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}
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requests[id].Time = now;
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}
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return true;
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}
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/// <summary>
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/// <see cref="IRequestLimitStrategy"/>
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/// </summary>
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public bool IsFirstRefusal(TId id)
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{
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if (IsMonitoringRequests(id))
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{
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if (1 == requests[id].Refusals)
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{
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return true;
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}
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}
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return false;
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}
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/// <summary>
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/// <see cref="IRequestLimitStrategy"/>
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/// </summary>
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public void MonitorRequests(TId id)
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{
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if (!IsMonitoringRequests(id))
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{
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requests.Add(id, new Request(System.DateTime.Now));
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}
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}
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/// <summary>
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/// <see cref="IRequestLimitStrategy"/>
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/// </summary>
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public bool IsMonitoringRequests(TId id)
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{
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return requests.ContainsKey(id);
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}
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}
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/// <summary>
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/// Private request details.
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/// </summary>
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class Request
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{
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/// <summary>
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/// Time of last request
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/// </summary>
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public DateTime Time;
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/// <summary>
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/// Number of refusals associated with this request
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/// </summary>
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public int Refusals;
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public Request(DateTime time)
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{
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Time = time;
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}
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}
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}
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@ -50,12 +50,16 @@ namespace OpenSim.Region.Environment.Modules
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= log4net.LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);
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/// <summary>
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/// We will allow the client to request the same texture n times before dropping further requests
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/// We will allow the client to request the same missing texture n times before dropping further requests
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///
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/// This number includes repeated requests for the same texture at different resolutions (which we don't
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/// currently handle properly as far as I know). However, this situation should be handled in a more
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/// sophisticated way.
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/// </summary>
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private static readonly int MAX_ALLOWED_TEXTURE_REQUESTS = 5;
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/// <summary>
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/// We're going to limit repeated requests for the same missing texture.
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/// We're going to limit requests for the same missing texture.
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/// XXX This is really a temporary solution to deal with the situation where a client continually requests
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/// the same missing textures
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/// </summary>
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@ -63,7 +67,7 @@ namespace OpenSim.Region.Environment.Modules
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= new RepeatLimitStrategy<LLUUID>(MAX_ALLOWED_TEXTURE_REQUESTS);
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/// <summary>
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/// XXX Also going to limit repeated requests for found textures.
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/// XXX Also going to limit requests for found textures.
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/// </summary>
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private readonly IRequestLimitStrategy<LLUUID> foundTextureLimitStrategy
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= new RepeatLimitStrategy<LLUUID>(MAX_ALLOWED_TEXTURE_REQUESTS);
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@ -115,6 +119,10 @@ namespace OpenSim.Region.Environment.Modules
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{
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if (!foundTextureLimitStrategy.AllowRequest(e.RequestedAssetID))
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{
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// m_log.DebugFormat(
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// "[USER TEXTURE DOWNLOAD SERVICE]: Refusing request for {0} from client {1}",
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// e.RequestedAssetID, m_client.AgentId);
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return;
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}
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else if (!missingTextureLimitStrategy.AllowRequest(e.RequestedAssetID))
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