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/**
* @file llplugininstance.cpp
* @brief LLPluginInstance handles loading the dynamic library of a plugin and setting up its entry points for message passing.
*
* @cond
* $LicenseInfo:firstyear=2008&license=viewerlgpl$
* 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
* $/LicenseInfo$
* @endcond
*/
#include "linden_common.h"
#include "llplugininstance.h"
#include "llapr.h"
#if LL_WINDOWS
#include "direct.h" // needed for _chdir()
#endif
/** Virtual destructor. */
LLPluginInstanceMessageListener::~LLPluginInstanceMessageListener()
{
}
/**
* TODO:DOC describe how it's used
*/
const char *LLPluginInstance::PLUGIN_INIT_FUNCTION_NAME = "LLPluginInitEntryPoint";
/**
* Constructor.
*
* @param[in] owner Plugin instance. TODO:DOC is this a good description of what "owner" is?
*/
LLPluginInstance::LLPluginInstance(LLPluginInstanceMessageListener *owner) :
mDSOHandle(NULL),
mPluginUserData(NULL),
mPluginSendMessageFunction(NULL)
{
mOwner = owner;
}
/**
* Destructor.
*/
LLPluginInstance::~LLPluginInstance()
{
if(mDSOHandle != NULL)
{
apr_dso_unload(mDSOHandle);
mDSOHandle = NULL;
}
}
/**
* Dynamically loads the plugin and runs the plugin's init function.
*
* @param[in] plugin_file Name of plugin dll/dylib/so. TODO:DOC is this correct? see .h
* @return 0 if successful, APR error code or error code from the plugin's init function on failure.
*/
int LLPluginInstance::load(const std::string& plugin_dir, std::string &plugin_file)
{
pluginInitFunction init_function = NULL;
if ( plugin_dir.length() )
{
#if LL_WINDOWS
// VWR-21275:
// *SOME* Windows systems fail to load the Qt plugins if the current working
// directory is not the same as the directory with the Qt DLLs in.
// This should not cause any run time issues since we are changing the cwd for the
// plugin shell process and not the viewer.
// Changing back to the previous directory is not necessary since the plugin shell
// quits once the plugin exits.
_chdir( plugin_dir.c_str() );
#endif
};
int result = apr_dso_load(&mDSOHandle,
plugin_file.c_str(),
gAPRPoolp);
if(result != APR_SUCCESS)
{
char buf[1024];
apr_dso_error(mDSOHandle, buf, sizeof(buf));
LL_WARNS("Plugin") << "apr_dso_load of " << plugin_file << " failed with error " << result << " , additional info string: " << buf << LL_ENDL;
}
if(result == APR_SUCCESS)
{
result = apr_dso_sym((apr_dso_handle_sym_t*)&init_function,
mDSOHandle,
PLUGIN_INIT_FUNCTION_NAME);
if(result != APR_SUCCESS)
{
LL_WARNS("Plugin") << "apr_dso_sym failed with error " << result << LL_ENDL;
}
}
if(result == APR_SUCCESS)
{
result = init_function(staticReceiveMessage, (void*)this, &mPluginSendMessageFunction, &mPluginUserData);
if(result != APR_SUCCESS)
{
LL_WARNS("Plugin") << "call to init function failed with error " << result << LL_ENDL;
}
}
return (int)result;
}
/**
* Sends a message to the plugin.
*
* @param[in] message Message
*/
void LLPluginInstance::sendMessage(const std::string &message)
{
if(mPluginSendMessageFunction)
{
LL_DEBUGS("Plugin") << "sending message to plugin: \"" << message << "\"" << LL_ENDL;
mPluginSendMessageFunction(message.c_str(), &mPluginUserData);
}
else
{
LL_WARNS("Plugin") << "dropping message: \"" << message << "\"" << LL_ENDL;
}
}
/**
* Idle. TODO:DOC what's the purpose of this?
*
*/
void LLPluginInstance::idle(void)
{
}
// static
void LLPluginInstance::staticReceiveMessage(const char *message_string, void **user_data)
{
// TODO: validate that the user_data argument is still a valid LLPluginInstance pointer
// we could also use a key that's looked up in a map (instead of a direct pointer) for safety, but that's probably overkill
LLPluginInstance *self = (LLPluginInstance*)*user_data;
self->receiveMessage(message_string);
}
/**
* Plugin receives message from plugin loader shell.
*
* @param[in] message_string Message
*/
void LLPluginInstance::receiveMessage(const char *message_string)
{
if(mOwner)
{
LL_DEBUGS("Plugin") << "processing incoming message: \"" << message_string << "\"" << LL_ENDL;
mOwner->receivePluginMessage(message_string);
}
else
{
LL_WARNS("Plugin") << "dropping incoming message: \"" << message_string << "\"" << LL_ENDL;
}
}
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