From 831e4c38506140e9ece2db4b96b4f0960a0276a8 Mon Sep 17 00:00:00 2001
From: Justin Clark-Casey (justincc)
Date: Thu, 4 Apr 2013 00:36:15 +0100
Subject: Fix bug where outstanding llHTTPRequests for scripts were not being
 aborted when they were deleted.

This was because AsyncCommandManager was handing an item ID to IHttpRequestModule.StopHttpRequest() rather than the expected request ID.
This commit also makes the http request asynchronous using BeginGetResponse() rather than doing this by launching a new thread
so that we can more safely abort it via HttpWebRequest.Abort() rather than aborting the thread itself.
This also renames StopHttpRequest() to StopHttpRequestsForScript() since any outstanding requests are now aborted and/or removed.
---
 .../Scripting/HttpRequest/ScriptsHttpRequests.cs   | 92 +++++++++++++++-------
 1 file changed, 62 insertions(+), 30 deletions(-)

(limited to 'OpenSim/Region/CoreModules/Scripting')

diff --git a/OpenSim/Region/CoreModules/Scripting/HttpRequest/ScriptsHttpRequests.cs b/OpenSim/Region/CoreModules/Scripting/HttpRequest/ScriptsHttpRequests.cs
index c2e37c4..1c251b8 100644
--- a/OpenSim/Region/CoreModules/Scripting/HttpRequest/ScriptsHttpRequests.cs
+++ b/OpenSim/Region/CoreModules/Scripting/HttpRequest/ScriptsHttpRequests.cs
@@ -28,12 +28,15 @@
 using System;
 using System.Collections.Generic;
 using System.IO;
+using System.Linq;
 using System.Net;
 using System.Net.Mail;
 using System.Net.Security;
+using System.Reflection;
 using System.Text;
 using System.Threading;
 using System.Security.Cryptography.X509Certificates;
+using log4net;
 using Nini.Config;
 using OpenMetaverse;
 using OpenSim.Framework;
@@ -250,18 +253,29 @@ namespace OpenSim.Region.CoreModules.Scripting.HttpRequest
             return reqID;
         }
 
-        public void StopHttpRequest(uint m_localID, UUID m_itemID)
+        public void StopHttpRequestsForScript(UUID id)
         {
             if (m_pendingRequests != null)
             {
+                List<UUID> keysToRemove = null;
+
                 lock (HttpListLock)
                 {
-                    HttpRequestClass tmpReq;
-                    if (m_pendingRequests.TryGetValue(m_itemID, out tmpReq))
+                    foreach (HttpRequestClass req in m_pendingRequests.Values)
                     {
-                        tmpReq.Stop();
-                        m_pendingRequests.Remove(m_itemID);
+                        if (req.ItemID == id)
+                        {
+                            req.Stop();
+
+                            if (keysToRemove == null)
+                                keysToRemove = new List<UUID>();
+
+                            keysToRemove.Add(req.ReqID);
+                        }
                     }
+
+                    if (keysToRemove != null)
+                        keysToRemove.ForEach(keyToRemove => m_pendingRequests.Remove(keyToRemove));
                 }
             }
         }
@@ -362,6 +376,8 @@ namespace OpenSim.Region.CoreModules.Scripting.HttpRequest
 
     public class HttpRequestClass: IServiceRequest
     {
+//        private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
+
         // Constants for parameters
         // public const int HTTP_BODY_MAXLENGTH = 2;
         // public const int HTTP_METHOD = 0;
@@ -419,12 +435,7 @@ namespace OpenSim.Region.CoreModules.Scripting.HttpRequest
 
         public void Process()
         {
-            httpThread = new Thread(SendRequest);
-            httpThread.Name = "HttpRequestThread";
-            httpThread.Priority = ThreadPriority.BelowNormal;
-            httpThread.IsBackground = true;
-            _finished = false;
-            httpThread.Start();
+            SendRequest();
         }
 
         /*
@@ -435,10 +446,6 @@ namespace OpenSim.Region.CoreModules.Scripting.HttpRequest
         public void SendRequest()
         {
             HttpWebResponse response = null;
-            StringBuilder sb = new StringBuilder();
-            byte[] buf = new byte[8192];
-            string tempString = null;
-            int count = 0;
 
             try
             {
@@ -497,11 +504,12 @@ namespace OpenSim.Region.CoreModules.Scripting.HttpRequest
                     bstream.Close();
                 }
 
-                Request.Timeout = HttpTimeout;
                 try
                 {
-                    // execute the request
-                    response = (HttpWebResponse) Request.GetResponse();
+                    IAsyncResult result = (IAsyncResult)Request.BeginGetResponse(ResponseCallback, null);
+
+                    ThreadPool.RegisterWaitForSingleObject(
+                        result.AsyncWaitHandle, new WaitOrTimerCallback(TimeoutCallback), null, HttpTimeout, true);
                 }
                 catch (WebException e)
                 {
@@ -510,11 +518,31 @@ namespace OpenSim.Region.CoreModules.Scripting.HttpRequest
                         throw;
                     }
                     response = (HttpWebResponse)e.Response;
+                    _finished = true;
                 }
+            }
+            catch (Exception e)
+            {
+                Status = (int)OSHttpStatusCode.ClientErrorJoker;
+                ResponseBody = e.Message;
+                _finished = true;
+            }
+        }
 
+        private void ResponseCallback(IAsyncResult ar)
+        {
+            HttpWebResponse response = null;
+
+            try
+            {
+                response = (HttpWebResponse)Request.EndGetResponse(ar);
                 Status = (int)response.StatusCode;
 
                 Stream resStream = response.GetResponseStream();
+                StringBuilder sb = new StringBuilder();
+                byte[] buf = new byte[8192];
+                string tempString = null;
+                int count = 0;
 
                 do
                 {
@@ -530,36 +558,40 @@ namespace OpenSim.Region.CoreModules.Scripting.HttpRequest
                         // continue building the string
                         sb.Append(tempString);
                     }
-                } while (count > 0); // any more data to read?
+                } 
+                while (count > 0); // any more data to read?
 
-                ResponseBody = sb.ToString();
+                ResponseBody = sb.ToString();         
             }
             catch (Exception e)
             {
                 Status = (int)OSHttpStatusCode.ClientErrorJoker;
                 ResponseBody = e.Message;
 
-                _finished = true;
-                return;
+//                m_log.Debug(
+//                    string.Format("[SCRIPTS HTTP REQUESTS]: Exception on response to {0} for {1}  ", Url, ItemID), e);
             }
             finally
             {
                 if (response != null)
                     response.Close();
+
+                _finished = true;
             }
+        }
 
-            _finished = true;
+        private void TimeoutCallback(object state, bool timedOut)
+        {
+            if (timedOut)
+                Request.Abort();
         }
 
         public void Stop()
         {
-            try
-            {
-                httpThread.Abort();
-            }
-            catch (Exception)
-            {
-            }
+//            m_log.DebugFormat("[SCRIPTS HTTP REQUESTS]: Stopping request to {0} for {1}  ", Url, ItemID);
+
+            if (Request != null)
+                Request.Abort();
         }
     }
 }
-- 
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