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/**
* @file lleventcoro.cpp
* @author Nat Goodspeed
* @date 2009-04-29
* @brief Implementation for lleventcoro.
*
* $LicenseInfo:firstyear=2009&license=viewerlgpl$
* Second Life Viewer Source Code
* Copyright (C) 2010, Linden Research, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License only.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
* $/LicenseInfo$
*/
// Precompiled header
#include "linden_common.h"
// associated header
#include "lleventcoro.h"
// STL headers
#include <map>
// std headers
// external library headers
#include <boost/dcoroutine/coroutine.hpp>
#include <boost/dcoroutine/future.hpp>
// other Linden headers
#include "llsdserialize.h"
#include "llerror.h"
#include "llcoros.h"
std::string LLEventDetail::listenerNameForCoro()
{
// If this coroutine was launched by LLCoros::launch(), find that name.
std::string name(LLCoros::instance().getName());
if (! name.empty())
{
return name;
}
// this is the first time we've been called for this coroutine instance
name = LLEventPump::inventName("coro");
LL_INFOS("LLEventCoro") << "listenerNameForCoro(): inventing coro name '"
<< name << "'" << LL_ENDL;
return name;
}
void LLEventDetail::storeToLLSDPath(LLSD& dest, const LLSD& rawPath, const LLSD& value)
{
if (rawPath.isUndefined())
{
// no-op case
return;
}
// Arrange to treat rawPath uniformly as an array. If it's not already an
// array, store it as the only entry in one.
LLSD path;
if (rawPath.isArray())
{
path = rawPath;
}
else
{
path.append(rawPath);
}
// Need to indicate a current destination -- but that current destination
// needs to change as we step through the path array. Where normally we'd
// use an LLSD& to capture a subscripted LLSD lvalue, this time we must
// instead use a pointer -- since it must be reassigned.
LLSD* pdest = &dest;
// Now loop through that array
for (LLSD::Integer i = 0; i < path.size(); ++i)
{
if (path[i].isString())
{
// *pdest is an LLSD map
pdest = &((*pdest)[path[i].asString()]);
}
else if (path[i].isInteger())
{
// *pdest is an LLSD array
pdest = &((*pdest)[path[i].asInteger()]);
}
else
{
// What do we do with Real or Array or Map or ...?
// As it's a coder error -- not a user error -- rub the coder's
// face in it so it gets fixed.
LL_ERRS("lleventcoro") << "storeToLLSDPath(" << dest << ", " << rawPath << ", " << value
<< "): path[" << i << "] bad type " << path[i].type() << LL_ENDL;
}
}
// Here *pdest is where we should store value.
*pdest = value;
}
LLSD postAndWait(const LLSD& event, const LLEventPumpOrPumpName& requestPump,
const LLEventPumpOrPumpName& replyPump, const LLSD& replyPumpNamePath)
{
// declare the future
boost::dcoroutines::future<LLSD> future(LLCoros::get_self());
// make a callback that will assign a value to the future, and listen on
// the specified LLEventPump with that callback
std::string listenerName(LLEventDetail::listenerNameForCoro());
LLTempBoundListener connection(
replyPump.getPump().listen(listenerName,
voidlistener(boost::dcoroutines::make_callback(future))));
// skip the "post" part if requestPump is default-constructed
if (requestPump)
{
// If replyPumpNamePath is non-empty, store the replyPump name in the
// request event.
LLSD modevent(event);
LLEventDetail::storeToLLSDPath(modevent, replyPumpNamePath, replyPump.getPump().getName());
LL_DEBUGS("lleventcoro") << "postAndWait(): coroutine " << listenerName
<< " posting to " << requestPump.getPump().getName()
<< LL_ENDL;
// *NOTE:Mani - Removed because modevent could contain user's hashed passwd.
// << ": " << modevent << LL_ENDL;
requestPump.getPump().post(modevent);
}
LL_DEBUGS("lleventcoro") << "postAndWait(): coroutine " << listenerName
<< " about to wait on LLEventPump " << replyPump.getPump().getName()
<< LL_ENDL;
// trying to dereference ("resolve") the future makes us wait for it
LLSD value;
{
// instantiate Suspending to manage the "current" coroutine
LLCoros::Suspending suspended;
value = *future;
} // destroy Suspending as soon as we're back
LL_DEBUGS("lleventcoro") << "postAndWait(): coroutine " << listenerName
<< " resuming with " << value << LL_ENDL;
// returning should disconnect the connection
return value;
}
LLEventWithID postAndWait2(const LLSD& event,
const LLEventPumpOrPumpName& requestPump,
const LLEventPumpOrPumpName& replyPump0,
const LLEventPumpOrPumpName& replyPump1,
const LLSD& replyPump0NamePath,
const LLSD& replyPump1NamePath)
{
// declare the future
boost::dcoroutines::future<LLEventWithID> future(LLCoros::get_self());
// either callback will assign a value to this future; listen on
// each specified LLEventPump with a callback
std::string name(LLEventDetail::listenerNameForCoro());
LLTempBoundListener connection0(
replyPump0.getPump().listen(name + "a",
LLEventDetail::wfeoh(boost::dcoroutines::make_callback(future), 0)));
LLTempBoundListener connection1(
replyPump1.getPump().listen(name + "b",
LLEventDetail::wfeoh(boost::dcoroutines::make_callback(future), 1)));
// skip the "post" part if requestPump is default-constructed
if (requestPump)
{
// If either replyPumpNamePath is non-empty, store the corresponding
// replyPump name in the request event.
LLSD modevent(event);
LLEventDetail::storeToLLSDPath(modevent, replyPump0NamePath,
replyPump0.getPump().getName());
LLEventDetail::storeToLLSDPath(modevent, replyPump1NamePath,
replyPump1.getPump().getName());
LL_DEBUGS("lleventcoro") << "postAndWait2(): coroutine " << name
<< " posting to " << requestPump.getPump().getName()
<< ": " << modevent << LL_ENDL;
requestPump.getPump().post(modevent);
}
LL_DEBUGS("lleventcoro") << "postAndWait2(): coroutine " << name
<< " about to wait on LLEventPumps " << replyPump0.getPump().getName()
<< ", " << replyPump1.getPump().getName() << LL_ENDL;
// trying to dereference ("resolve") the future makes us wait for it
LLEventWithID value;
{
// instantiate Suspending to manage "current" coroutine
LLCoros::Suspending suspended;
value = *future;
} // destroy Suspending as soon as we're back
LL_DEBUGS("lleventcoro") << "postAndWait(): coroutine " << name
<< " resuming with (" << value.first << ", " << value.second << ")"
<< LL_ENDL;
// returning should disconnect both connections
return value;
}
LLSD errorException(const LLEventWithID& result, const std::string& desc)
{
// If the result arrived on the error pump (pump 1), instead of
// returning it, deliver it via exception.
if (result.second)
{
throw LLErrorEvent(desc, result.first);
}
// That way, our caller knows a simple return must be from the reply
// pump (pump 0).
return result.first;
}
LLSD errorLog(const LLEventWithID& result, const std::string& desc)
{
// If the result arrived on the error pump (pump 1), log it as a fatal
// error.
if (result.second)
{
LL_ERRS("errorLog") << desc << ":" << std::endl;
LLSDSerialize::toPrettyXML(result.first, LL_CONT);
LL_CONT << LL_ENDL;
}
// A simple return must therefore be from the reply pump (pump 0).
return result.first;
}
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