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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.
*
* $LicenseInfo:firstyear=2008&license=viewergpl$
*
* Copyright (c) 2008-2009, 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 "linden_common.h"
#include "llplugininstance.h"
#include "llapr.h"
/** 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(std::string &plugin_file)
{
pluginInitFunction init_function = NULL;
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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