summaryrefslogtreecommitdiff
path: root/indra/newview/lleventpoll.cpp
blob: cc4e1a186844eecbea764f29df89cd1cb87f50ff (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
/**
 * @file lleventpoll.cpp
 * @brief Implementation of the LLEventPoll class.
 *
 * $LicenseInfo:firstyear=2006&license=viewergpl$
 * 
 * Copyright (c) 2006-2009, 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();
}