lleventpoll.cpp
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- /**
- * @file lleventpoll.cpp
- * @brief Implementation of the LLEventPoll class.
- *
- * $LicenseInfo:firstyear=2006&license=viewergpl$
- *
- * Copyright (c) 2006-2010, Linden Research, Inc.
- *
- * Second Life Viewer Source Code
- * The source code in this file ("Source Code") is provided by Linden Lab
- * to you under the terms of the GNU General Public License, version 2.0
- * ("GPL"), unless you have obtained a separate licensing agreement
- * ("Other License"), formally executed by you and Linden Lab. Terms of
- * the GPL can be found in doc/GPL-license.txt in this distribution, or
- * online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
- *
- * There are special exceptions to the terms and conditions of the GPL as
- * it is applied to this Source Code. View the full text of the exception
- * in the file doc/FLOSS-exception.txt in this software distribution, or
- * online at
- * http://secondlifegrid.net/programs/open_source/licensing/flossexception
- *
- * By copying, modifying or distributing this software, you acknowledge
- * that you have read and understood your obligations described above,
- * and agree to abide by those obligations.
- *
- * ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
- * WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
- * COMPLETENESS OR PERFORMANCE.
- * $/LicenseInfo$
- */
- #include "llviewerprecompiledheaders.h"
- #include "lleventpoll.h"
- #include "llappviewer.h"
- #include "llagent.h"
- #include "llhttpclient.h"
- #include "llhttpstatuscodes.h"
- #include "llsdserialize.h"
- #include "lleventtimer.h"
- #include "llviewerregion.h"
- #include "message.h"
- #include "lltrans.h"
- namespace
- {
- // We will wait RETRY_SECONDS + (errorCount * RETRY_SECONDS_INC) before retrying after an error.
- // This means we attempt to recover relatively quickly but back off giving more time to recover
- // until we finally give up after MAX_EVENT_POLL_HTTP_ERRORS attempts.
- const F32 EVENT_POLL_ERROR_RETRY_SECONDS = 15.f; // ~ half of a normal timeout.
- const F32 EVENT_POLL_ERROR_RETRY_SECONDS_INC = 5.f; // ~ half of a normal timeout.
- const S32 MAX_EVENT_POLL_HTTP_ERRORS = 10; // ~5 minutes, by the above rules.
- class LLEventPollResponder : public LLHTTPClient::Responder
- {
- public:
-
- static LLHTTPClient::ResponderPtr start(const std::string& pollURL, const LLHost& sender);
- void stop();
-
- void makeRequest();
- private:
- LLEventPollResponder(const std::string& pollURL, const LLHost& sender);
- ~LLEventPollResponder();
-
- void handleMessage(const LLSD& content);
- virtual void error(U32 status, const std::string& reason);
- virtual void result(const LLSD& content);
- virtual void completedRaw(U32 status,
- const std::string& reason,
- const LLChannelDescriptors& channels,
- const LLIOPipe::buffer_ptr_t& buffer);
- private:
- bool mDone;
- std::string mPollURL;
- std::string mSender;
-
- LLSD mAcknowledge;
-
- // these are only here for debugging so we can see which poller is which
- static int sCount;
- int mCount;
- S32 mErrorCount;
- };
- class LLEventPollEventTimer : public LLEventTimer
- {
- typedef boost::intrusive_ptr<LLEventPollResponder> EventPollResponderPtr;
- public:
- LLEventPollEventTimer(F32 period, EventPollResponderPtr responder)
- : LLEventTimer(period), mResponder(responder)
- { }
- virtual BOOL tick()
- {
- mResponder->makeRequest();
- return TRUE; // Causes this instance to be deleted.
- }
- private:
-
- EventPollResponderPtr mResponder;
- };
- //static
- LLHTTPClient::ResponderPtr LLEventPollResponder::start(
- const std::string& pollURL, const LLHost& sender)
- {
- LLHTTPClient::ResponderPtr result = new LLEventPollResponder(pollURL, sender);
- llinfos << "LLEventPollResponder::start <" << sCount << "> "
- << pollURL << llendl;
- return result;
- }
- void LLEventPollResponder::stop()
- {
- llinfos << "LLEventPollResponder::stop <" << mCount << "> "
- << mPollURL << llendl;
- // there should be a way to stop a LLHTTPClient request in progress
- mDone = true;
- }
- int LLEventPollResponder::sCount = 0;
- LLEventPollResponder::LLEventPollResponder(const std::string& pollURL, const LLHost& sender)
- : mDone(false),
- mPollURL(pollURL),
- mCount(++sCount),
- mErrorCount(0)
- {
- //extract host and port of simulator to set as sender
- LLViewerRegion *regionp = gAgent.getRegion();
- if (!regionp)
- {
- llerrs << "LLEventPoll initialized before region is added." << llendl;
- }
- mSender = sender.getIPandPort();
- llinfos << "LLEventPoll initialized with sender " << mSender << llendl;
- makeRequest();
- }
- LLEventPollResponder::~LLEventPollResponder()
- {
- stop();
- lldebugs << "LLEventPollResponder::~Impl <" << mCount << "> "
- << mPollURL << llendl;
- }
- // virtual
- void LLEventPollResponder::completedRaw(U32 status,
- const std::string& reason,
- const LLChannelDescriptors& channels,
- const LLIOPipe::buffer_ptr_t& buffer)
- {
- if (status == HTTP_BAD_GATEWAY)
- {
- // These errors are not parsable as LLSD,
- // which LLHTTPClient::Responder::completedRaw will try to do.
- completed(status, reason, LLSD());
- }
- else
- {
- LLHTTPClient::Responder::completedRaw(status,reason,channels,buffer);
- }
- }
- void LLEventPollResponder::makeRequest()
- {
- LLSD request;
- request["ack"] = mAcknowledge;
- request["done"] = mDone;
-
- lldebugs << "LLEventPollResponder::makeRequest <" << mCount << "> ack = "
- << LLSDXMLStreamer(mAcknowledge) << llendl;
- LLHTTPClient::post(mPollURL, request, this);
- }
- void LLEventPollResponder::handleMessage(const LLSD& content)
- {
- std::string msg_name = content["message"];
- LLSD message;
- message["sender"] = mSender;
- message["body"] = content["body"];
- LLMessageSystem::dispatch(msg_name, message);
- }
- //virtual
- void LLEventPollResponder::error(U32 status, const std::string& reason)
- {
- if (mDone) return;
- // A HTTP_BAD_GATEWAY (502) error is our standard timeout response
- // we get this when there are no events.
- if ( status == HTTP_BAD_GATEWAY )
- {
- mErrorCount = 0;
- makeRequest();
- }
- else if (mErrorCount < MAX_EVENT_POLL_HTTP_ERRORS)
- {
- ++mErrorCount;
-
- // The 'tick' will return TRUE causing the timer to delete this.
- new LLEventPollEventTimer(EVENT_POLL_ERROR_RETRY_SECONDS
- + mErrorCount * EVENT_POLL_ERROR_RETRY_SECONDS_INC
- , this);
- llwarns << "Unexpected HTTP error. status: " << status << ", reason: " << reason << llendl;
- }
- else
- {
- llwarns << "LLEventPollResponder::error: <" << mCount << "> got "
- << status << ": " << reason
- << (mDone ? " -- done" : "") << llendl;
- stop();
- // At this point we have given up and the viewer will not receive HTTP messages from the simulator.
- // IMs, teleports, about land, selecing land, region crossing and more will all fail.
- // They are essentially disconnected from the region even though some things may still work.
- // Since things won't get better until they relog we force a disconnect now.
- // *NOTE:Mani - The following condition check to see if this failing event poll
- // is attached to the Agent's main region. If so we disconnect the viewer.
- // Else... its a child region and we just leave the dead event poll stopped and
- // continue running.
- if(gAgent.getRegion() && gAgent.getRegion()->getHost().getIPandPort() == mSender)
- {
- llwarns << "Forcing disconnect due to stalled main region event poll." << llendl;
- LLAppViewer::instance()->forceDisconnect(LLTrans::getString("AgentLostConnection"));
- }
- }
- }
- //virtual
- void LLEventPollResponder::result(const LLSD& content)
- {
- lldebugs << "LLEventPollResponder::result <" << mCount << ">"
- << (mDone ? " -- done" : "") << llendl;
-
- if (mDone) return;
- mErrorCount = 0;
- if (!content.get("events") ||
- !content.get("id"))
- {
- llwarns << "received event poll with no events or id key" << llendl;
- makeRequest();
- return;
- }
-
- mAcknowledge = content["id"];
- LLSD events = content["events"];
- if(mAcknowledge.isUndefined())
- {
- llwarns << "LLEventPollResponder: id undefined" << llendl;
- }
-
- // was llinfos but now that CoarseRegionUpdate is TCP @ 1/second, it'd be too verbose for viewer logs. -MG
- lldebugs << "LLEventPollResponder::completed <" << mCount << "> " << events.size() << "events (id "
- << LLSDXMLStreamer(mAcknowledge) << ")" << llendl;
-
- LLSD::array_const_iterator i = events.beginArray();
- LLSD::array_const_iterator end = events.endArray();
- for (; i != end; ++i)
- {
- if (i->has("message"))
- {
- handleMessage(*i);
- }
- }
-
- makeRequest();
- }
- }
- LLEventPoll::LLEventPoll(const std::string& poll_url, const LLHost& sender)
- : mImpl(LLEventPollResponder::start(poll_url, sender))
- { }
- LLEventPoll::~LLEventPoll()
- {
- LLHTTPClient::Responder* responderp = mImpl.get();
- LLEventPollResponder* event_poll_responder = dynamic_cast<LLEventPollResponder*>(responderp);
- if (event_poll_responder) event_poll_responder->stop();
- }