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Resolve various race conditions between accessing and removing external script URLs by more consistently locking on m_UrlMap

0.7.4.1
Justin Clark-Casey (justincc) 2012-06-22 23:49:52 +01:00
parent dca04c7b61
commit 78143769bf
1 changed files with 148 additions and 132 deletions
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100
OpenSim/Region/CoreModules/Scripting/LSLHttp/UrlModule.cs
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@ -41,13 +41,39 @@ using OpenSim.Region.Framework.Scenes;
namespace OpenSim.Region.CoreModules.Scripting.LSLHttp
{
/// <summary>
/// Data describing an external URL set up by a script.
/// </summary>
public class UrlData
{
/// <summary>
/// Scene object part hosting the script
/// </summary>
public UUID hostID;
/// <summary>
/// The item ID of the script that requested the URL.
/// </summary>
public UUID itemID;
/// <summary>
/// The script engine that runs the script.
/// </summary>
public IScriptModule engine;
/// <summary>
/// The generated URL.
/// </summary>
public string url;
/// <summary>
/// The random UUID component of the generated URL.
/// </summary>
public UUID urlcode;
/// <summary>
/// The external requests currently being processed or awaiting retrieval for this URL.
/// </summary>
public Dictionary<UUID, RequestData> requests;
}
@ -77,6 +103,10 @@ namespace OpenSim.Region.CoreModules.Scripting.LSLHttp
/// Indexs the URL request metadata (which script requested it, outstanding requests, etc.) by the request ID
/// randomly generated when a request is received for this URL.
/// </summary>
/// <remarks>
/// Manipulation or retrieval from this dictionary must be locked on m_UrlMap to preserve consistency with
/// m_UrlMap
/// </remarks>
private Dictionary<UUID, UrlData> m_RequestMap = new Dictionary<UUID, UrlData>();
/// <summary>
@ -113,10 +143,9 @@ namespace OpenSim.Region.CoreModules.Scripting.LSLHttp
{
m_ExternalHostNameForLSL = config.Configs["Network"].GetString("ExternalHostNameForLSL", System.Environment.MachineName);
bool ssl_enabled = config.Configs["Network"].GetBoolean("https_listener",false);
if (ssl_enabled)
{
https_port = (uint) config.Configs["Network"].GetInt("https_port",0);
}
IConfig llFunctionsConfig = config.Configs["LL-Functions"];
@ -274,6 +303,8 @@ namespace OpenSim.Region.CoreModules.Scripting.LSLHttp
}
public void HttpResponse(UUID request, int status, string body)
{
lock (m_UrlMap)
{
if (m_RequestMap.ContainsKey(request))
{
@ -288,26 +319,31 @@ namespace OpenSim.Region.CoreModules.Scripting.LSLHttp
m_log.Info("[HttpRequestHandler] There is no http-in request with id " + request.ToString());
}
}
}
public string GetHttpHeader(UUID requestId, string header)
{
lock (m_UrlMap)
{
if (m_RequestMap.ContainsKey(requestId))
{
UrlData urlData = m_RequestMap[requestId];
string value;
if (urlData.requests[requestId].headers.TryGetValue(header,out value))
if (urlData.requests[requestId].headers.TryGetValue(header, out value))
return value;
}
else
{
m_log.Warn("[HttpRequestHandler] There was no http-in request with id " + requestId);
}
}
return String.Empty;
}
public int GetFreeUrls()
{
lock (m_UrlMap)
return m_TotalUrls - m_UrlMap.Count;
}
@ -366,9 +402,9 @@ namespace OpenSim.Region.CoreModules.Scripting.LSLHttp
private Hashtable NoEvents(UUID requestID, UUID sessionID)
{
Hashtable response = new Hashtable();
UrlData url;
UrlData urlData;
lock (m_RequestMap)
lock (m_UrlMap)
{
// We need to return a 404 here in case the request URL was removed at exactly the same time that a
// request was made. In this case, the request thread can outrace llRemoveURL() and still be polling
@ -383,10 +419,9 @@ namespace OpenSim.Region.CoreModules.Scripting.LSLHttp
return response;
}
url = m_RequestMap[requestID];
}
urlData = m_RequestMap[requestID];
if (System.Environment.TickCount - url.requests[requestID].startTime > 25000)
if (System.Environment.TickCount - urlData.requests[requestID].startTime > 25000)
{
response["int_response_code"] = 500;
response["str_response_string"] = "Script timeout";
@ -395,23 +430,19 @@ namespace OpenSim.Region.CoreModules.Scripting.LSLHttp
response["reusecontext"] = false;
//remove from map
lock (url)
{
url.requests.Remove(requestID);
urlData.requests.Remove(requestID);
m_RequestMap.Remove(requestID);
}
return response;
}
}
return response;
}
private bool HasEvents(UUID requestID, UUID sessionID)
{
UrlData url = null;
lock (m_RequestMap)
lock (m_UrlMap)
{
// We return true here because an external URL request that happened at the same time as an llRemoveURL()
// can still make it through to HttpRequestHandler(). That will return without setting up a request
@ -423,40 +454,42 @@ namespace OpenSim.Region.CoreModules.Scripting.LSLHttp
return true;
}
url = m_RequestMap[requestID];
if (!url.requests.ContainsKey(requestID))
UrlData urlData = m_RequestMap[requestID];
if (!urlData.requests.ContainsKey(requestID))
{
return true;
}
}
// Trigger return of timeout response.
if (System.Environment.TickCount - url.requests[requestID].startTime > 25000)
if (System.Environment.TickCount - urlData.requests[requestID].startTime > 25000)
{
return true;
}
return url.requests[requestID].requestDone;
return urlData.requests[requestID].requestDone;
}
}
private Hashtable GetEvents(UUID requestID, UUID sessionID, string request)
{
Hashtable response;
lock (m_UrlMap)
{
UrlData url = null;
RequestData requestData = null;
lock (m_RequestMap)
{
if (!m_RequestMap.ContainsKey(requestID))
return NoEvents(requestID, sessionID);
url = m_RequestMap[requestID];
requestData = url.requests[requestID];
}
if (!requestData.requestDone)
return NoEvents(requestID, sessionID);
Hashtable response = new Hashtable();
response = new Hashtable();
if (System.Environment.TickCount - requestData.startTime > 25000)
{
@ -476,8 +509,6 @@ namespace OpenSim.Region.CoreModules.Scripting.LSLHttp
response["reusecontext"] = false;
//remove from map
lock (url)
{
url.requests.Remove(requestID);
m_RequestMap.Remove(requestID);
}
@ -486,8 +517,6 @@ namespace OpenSim.Region.CoreModules.Scripting.LSLHttp
}
public void HttpRequestHandler(UUID requestID, Hashtable request)
{
lock (request)
{
string uri = request["uri"].ToString();
bool is_ssl = uri.Contains("lslhttps");
@ -524,7 +553,6 @@ namespace OpenSim.Region.CoreModules.Scripting.LSLHttp
// request was being processed.
if (!m_UrlMap.TryGetValue(url, out urlData))
return;
}
//for llGetHttpHeader support we need to store original URI here
//to make x-path-info / x-query-string / x-script-url / x-remote-ip headers
@ -544,6 +572,7 @@ namespace OpenSim.Region.CoreModules.Scripting.LSLHttp
string value = (string)header.Value;
requestData.headers.Add(key, value);
}
foreach (DictionaryEntry de in request)
{
if (de.Key.ToString() == "querystringkeys")
@ -570,14 +599,7 @@ namespace OpenSim.Region.CoreModules.Scripting.LSLHttp
requestData.headers["x-query-string"] = queryString;
requestData.headers["x-script-url"] = urlData.url;
//requestData.ev = new ManualResetEvent(false);
lock (urlData.requests)
{
urlData.requests.Add(requestID, requestData);
}
lock (m_RequestMap)
{
m_RequestMap.Add(requestID, urlData);
}
@ -585,11 +607,6 @@ namespace OpenSim.Region.CoreModules.Scripting.LSLHttp
urlData.itemID,
"http_request",
new Object[] { requestID.ToString(), request["http-method"].ToString(), request["body"].ToString() });
//send initial response?
// Hashtable response = new Hashtable();
return;
}
catch (Exception we)
{
@ -599,7 +616,6 @@ namespace OpenSim.Region.CoreModules.Scripting.LSLHttp
m_log.Warn(we.StackTrace);
}
}
}
private void OnScriptReset(uint localID, UUID itemID)
{