llpluginprocessparent.cpp
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- /**
- * @file llpluginprocessparent.cpp
- * @brief LLPluginProcessParent handles the parent side of the external-process plugin API.
- *
- * @cond
- * $LicenseInfo:firstyear=2008&license=viewergpl$
- *
- * Copyright (c) 2008-2010, 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.
- * $/LicenseInfo$
- * @endcond
- */
- #include "linden_common.h"
- #include "llpluginprocessparent.h"
- #include "llpluginmessagepipe.h"
- #include "llpluginmessageclasses.h"
- #include "llapr.h"
- //virtual
- LLPluginProcessParentOwner::~LLPluginProcessParentOwner()
- {
- }
- LLPluginProcessParent::LLPluginProcessParent(LLPluginProcessParentOwner *owner)
- {
- mOwner = owner;
- mBoundPort = 0;
- mState = STATE_UNINITIALIZED;
- mSleepTime = 0.0;
- mCPUUsage = 0.0;
- mDisableTimeout = false;
- mDebug = false;
- mPluginLaunchTimeout = 60.0f;
- mPluginLockupTimeout = 15.0f;
- // Don't start the timer here -- start it when we actually launch the plugin process.
- mHeartbeat.stop();
- }
- LLPluginProcessParent::~LLPluginProcessParent()
- {
- LL_DEBUGS("Plugin") << "destructor" << LL_ENDL;
- // Destroy any remaining shared memory regions
- sharedMemoryRegionsType::iterator iter;
- while((iter = mSharedMemoryRegions.begin()) != mSharedMemoryRegions.end())
- {
- // destroy the shared memory region
- iter->second->destroy();
- // and remove it from our map
- mSharedMemoryRegions.erase(iter);
- }
- // orphaning the process means it won't be killed when the LLProcessLauncher is destructed.
- // This is what we want -- it should exit cleanly once it notices the sockets have been closed.
- mProcess.orphan();
- killSockets();
- }
- void LLPluginProcessParent::killSockets(void)
- {
- killMessagePipe();
- mListenSocket.reset();
- mSocket.reset();
- }
- void LLPluginProcessParent::errorState(void)
- {
- if(mState < STATE_RUNNING)
- setState(STATE_LAUNCH_FAILURE);
- else
- setState(STATE_ERROR);
- }
- void LLPluginProcessParent::init(const std::string &launcher_filename, const std::string &plugin_filename, bool debug, const std::string &user_data_path)
- {
- mProcess.setExecutable(launcher_filename);
- mPluginFile = plugin_filename;
- mCPUUsage = 0.0f;
- mDebug = debug;
- mUserDataPath = user_data_path;
- setState(STATE_INITIALIZED);
- }
- bool LLPluginProcessParent::accept()
- {
- bool result = false;
- apr_status_t status = APR_EGENERAL;
- apr_socket_t *new_socket = NULL;
- status = apr_socket_accept(
- &new_socket,
- mListenSocket->getSocket(),
- gAPRPoolp);
- if(status == APR_SUCCESS)
- {
- // llinfos << "SUCCESS" << llendl;
- // Success. Create a message pipe on the new socket
- // we MUST create a new pool for the LLSocket, since it will take ownership of it and delete it in its destructor!
- apr_pool_t* new_pool = NULL;
- status = apr_pool_create(&new_pool, gAPRPoolp);
- mSocket = LLSocket::create(new_socket, new_pool);
- new LLPluginMessagePipe(this, mSocket);
- result = true;
- }
- else if(APR_STATUS_IS_EAGAIN(status))
- {
- // llinfos << "EAGAIN" << llendl;
- // No incoming connections. This is not an error.
- status = APR_SUCCESS;
- }
- else
- {
- // llinfos << "Error:" << llendl;
- ll_apr_warn_status(status);
- // Some other error.
- errorState();
- }
- return result;
- }
- void LLPluginProcessParent::idle(void)
- {
- bool idle_again;
- do
- {
- // Give time to network processing
- if(mMessagePipe)
- {
- if(!mMessagePipe->pump())
- {
- // LL_WARNS("Plugin") << "Message pipe hit an error state" << LL_ENDL;
- errorState();
- }
- }
- if((mSocketError != APR_SUCCESS) && (mState <= STATE_RUNNING))
- {
- // The socket is in an error state -- the plugin is gone.
- LL_WARNS("Plugin") << "Socket hit an error state (" << mSocketError << ")" << LL_ENDL;
- errorState();
- }
- // If a state needs to go directly to another state (as a performance enhancement), it can set idle_again to true after calling setState().
- // USE THIS CAREFULLY, since it can starve other code. Specifically make sure there's no way to get into a closed cycle and never return.
- // When in doubt, don't do it.
- idle_again = false;
- switch(mState)
- {
- case STATE_UNINITIALIZED:
- break;
- case STATE_INITIALIZED:
- {
- apr_status_t status = APR_SUCCESS;
- apr_sockaddr_t* addr = NULL;
- mListenSocket = LLSocket::create(gAPRPoolp, LLSocket::STREAM_TCP);
- mBoundPort = 0;
- // This code is based on parts of LLSocket::create() in lliosocket.cpp.
- status = apr_sockaddr_info_get(
- &addr,
- "127.0.0.1",
- APR_INET,
- 0, // port 0 = ephemeral ("find me a port")
- 0,
- gAPRPoolp);
- if(ll_apr_warn_status(status))
- {
- killSockets();
- errorState();
- break;
- }
- // This allows us to reuse the address on quick down/up. This is unlikely to create problems.
- ll_apr_warn_status(apr_socket_opt_set(mListenSocket->getSocket(), APR_SO_REUSEADDR, 1));
- status = apr_socket_bind(mListenSocket->getSocket(), addr);
- if(ll_apr_warn_status(status))
- {
- killSockets();
- errorState();
- break;
- }
- // Get the actual port the socket was bound to
- {
- apr_sockaddr_t* bound_addr = NULL;
- if(ll_apr_warn_status(apr_socket_addr_get(&bound_addr, APR_LOCAL, mListenSocket->getSocket())))
- {
- killSockets();
- errorState();
- break;
- }
- mBoundPort = bound_addr->port;
- if(mBoundPort == 0)
- {
- LL_WARNS("Plugin") << "Bound port number unknown, bailing out." << LL_ENDL;
- killSockets();
- errorState();
- break;
- }
- }
- LL_DEBUGS("Plugin") << "Bound tcp socket to port: " << addr->port << LL_ENDL;
- // Make the listen socket non-blocking
- status = apr_socket_opt_set(mListenSocket->getSocket(), APR_SO_NONBLOCK, 1);
- if(ll_apr_warn_status(status))
- {
- killSockets();
- errorState();
- break;
- }
- apr_socket_timeout_set(mListenSocket->getSocket(), 0);
- if(ll_apr_warn_status(status))
- {
- killSockets();
- errorState();
- break;
- }
- // If it's a stream based socket, we need to tell the OS
- // to keep a queue of incoming connections for ACCEPT.
- status = apr_socket_listen(
- mListenSocket->getSocket(),
- 10); // FIXME: Magic number for queue size
- if(ll_apr_warn_status(status))
- {
- killSockets();
- errorState();
- break;
- }
- // If we got here, we're listening.
- setState(STATE_LISTENING);
- }
- break;
- case STATE_LISTENING:
- {
- // Launch the plugin process.
- // Only argument to the launcher is the port number we're listening on
- std::stringstream stream;
- stream << mBoundPort;
- mProcess.addArgument(stream.str());
- if(mProcess.launch() != 0)
- {
- errorState();
- }
- else
- {
- if(mDebug)
- {
- #if LL_DARWIN
- // If we're set to debug, start up a gdb instance in a new terminal window and have it attach to the plugin process and continue.
- // The command we're constructing would look like this on the command line:
- // osascript -e 'tell application "Terminal"' -e 'set win to do script "gdb -pid 12345"' -e 'do script "continue" in win' -e 'end tell'
- std::stringstream cmd;
- mDebugger.setExecutable("/usr/bin/osascript");
- mDebugger.addArgument("-e");
- mDebugger.addArgument("tell application "Terminal"");
- mDebugger.addArgument("-e");
- cmd << "set win to do script "gdb -pid " << mProcess.getProcessID() << """;
- mDebugger.addArgument(cmd.str());
- mDebugger.addArgument("-e");
- mDebugger.addArgument("do script "continue" in win");
- mDebugger.addArgument("-e");
- mDebugger.addArgument("end tell");
- mDebugger.launch();
- #endif
- }
- // This will allow us to time out if the process never starts.
- mHeartbeat.start();
- mHeartbeat.setTimerExpirySec(mPluginLaunchTimeout);
- setState(STATE_LAUNCHED);
- }
- }
- break;
- case STATE_LAUNCHED:
- // waiting for the plugin to connect
- if(pluginLockedUpOrQuit())
- {
- errorState();
- }
- else
- {
- // Check for the incoming connection.
- if(accept())
- {
- // Stop listening on the server port
- mListenSocket.reset();
- setState(STATE_CONNECTED);
- }
- }
- break;
- case STATE_CONNECTED:
- // waiting for hello message from the plugin
- if(pluginLockedUpOrQuit())
- {
- errorState();
- }
- break;
- case STATE_HELLO:
- LL_DEBUGS("Plugin") << "received hello message" << llendl;
- // Send the message to load the plugin
- {
- LLPluginMessage message(LLPLUGIN_MESSAGE_CLASS_INTERNAL, "load_plugin");
- message.setValue("file", mPluginFile);
- message.setValue("user_data_path", mUserDataPath);
- sendMessage(message);
- }
- setState(STATE_LOADING);
- break;
- case STATE_LOADING:
- // The load_plugin_response message will kick us from here into STATE_RUNNING
- if(pluginLockedUpOrQuit())
- {
- errorState();
- }
- break;
- case STATE_RUNNING:
- if(pluginLockedUpOrQuit())
- {
- errorState();
- }
- break;
- case STATE_EXITING:
- if(!mProcess.isRunning())
- {
- setState(STATE_CLEANUP);
- }
- else if(pluginLockedUp())
- {
- LL_WARNS("Plugin") << "timeout in exiting state, bailing out" << llendl;
- errorState();
- }
- break;
- case STATE_LAUNCH_FAILURE:
- if(mOwner != NULL)
- {
- mOwner->pluginLaunchFailed();
- }
- setState(STATE_CLEANUP);
- break;
- case STATE_ERROR:
- if(mOwner != NULL)
- {
- mOwner->pluginDied();
- }
- setState(STATE_CLEANUP);
- break;
- case STATE_CLEANUP:
- // Don't do a kill here anymore -- closing the sockets is the new 'kill'.
- mProcess.orphan();
- killSockets();
- setState(STATE_DONE);
- break;
- case STATE_DONE:
- // just sit here.
- break;
- }
- } while (idle_again);
- }
- bool LLPluginProcessParent::isLoading(void)
- {
- bool result = false;
- if(mState <= STATE_LOADING)
- result = true;
- return result;
- }
- bool LLPluginProcessParent::isRunning(void)
- {
- bool result = false;
- if(mState == STATE_RUNNING)
- result = true;
- return result;
- }
- bool LLPluginProcessParent::isDone(void)
- {
- bool result = false;
- if(mState == STATE_DONE)
- result = true;
- return result;
- }
- void LLPluginProcessParent::setSleepTime(F64 sleep_time, bool force_send)
- {
- if(force_send || (sleep_time != mSleepTime))
- {
- // Cache the time locally
- mSleepTime = sleep_time;
- if(canSendMessage())
- {
- // and send to the plugin.
- LLPluginMessage message(LLPLUGIN_MESSAGE_CLASS_INTERNAL, "sleep_time");
- message.setValueReal("time", mSleepTime);
- sendMessage(message);
- }
- else
- {
- // Too early to send -- the load_plugin_response message will trigger us to send mSleepTime later.
- }
- }
- }
- void LLPluginProcessParent::sendMessage(const LLPluginMessage &message)
- {
- std::string buffer = message.generate();
- LL_DEBUGS("Plugin") << "Sending: " << buffer << LL_ENDL;
- writeMessageRaw(buffer);
- }
- void LLPluginProcessParent::receiveMessageRaw(const std::string &message)
- {
- LL_DEBUGS("Plugin") << "Received: " << message << LL_ENDL;
- // FIXME: should this go into a queue instead?
- LLPluginMessage parsed;
- if(parsed.parse(message) != -1)
- {
- receiveMessage(parsed);
- }
- }
- void LLPluginProcessParent::receiveMessage(const LLPluginMessage &message)
- {
- std::string message_class = message.getClass();
- if(message_class == LLPLUGIN_MESSAGE_CLASS_INTERNAL)
- {
- // internal messages should be handled here
- std::string message_name = message.getName();
- if(message_name == "hello")
- {
- if(mState == STATE_CONNECTED)
- {
- // Plugin host has launched. Tell it which plugin to load.
- setState(STATE_HELLO);
- }
- else
- {
- LL_WARNS("Plugin") << "received hello message in wrong state -- bailing out" << LL_ENDL;
- errorState();
- }
- }
- else if(message_name == "load_plugin_response")
- {
- if(mState == STATE_LOADING)
- {
- // Plugin has been loaded.
- mPluginVersionString = message.getValue("plugin_version");
- LL_INFOS("Plugin") << "plugin version string: " << mPluginVersionString << LL_ENDL;
- // Check which message classes/versions the plugin supports.
- // TODO: check against current versions
- // TODO: kill plugin on major mismatches?
- mMessageClassVersions = message.getValueLLSD("versions");
- LLSD::map_iterator iter;
- for(iter = mMessageClassVersions.beginMap(); iter != mMessageClassVersions.endMap(); iter++)
- {
- LL_INFOS("Plugin") << "message class: " << iter->first << " -> version: " << iter->second.asString() << LL_ENDL;
- }
- // Send initial sleep time
- setSleepTime(mSleepTime, true);
- setState(STATE_RUNNING);
- }
- else
- {
- LL_WARNS("Plugin") << "received load_plugin_response message in wrong state -- bailing out" << LL_ENDL;
- errorState();
- }
- }
- else if(message_name == "heartbeat")
- {
- // this resets our timer.
- mHeartbeat.setTimerExpirySec(mPluginLockupTimeout);
- mCPUUsage = message.getValueReal("cpu_usage");
- LL_DEBUGS("Plugin") << "cpu usage reported as " << mCPUUsage << LL_ENDL;
- }
- else if(message_name == "shm_add_response")
- {
- // Nothing to do here.
- }
- else if(message_name == "shm_remove_response")
- {
- std::string name = message.getValue("name");
- sharedMemoryRegionsType::iterator iter = mSharedMemoryRegions.find(name);
- if(iter != mSharedMemoryRegions.end())
- {
- // destroy the shared memory region
- iter->second->destroy();
- // and remove it from our map
- mSharedMemoryRegions.erase(iter);
- }
- }
- else
- {
- LL_WARNS("Plugin") << "Unknown internal message from child: " << message_name << LL_ENDL;
- }
- }
- else
- {
- if(mOwner != NULL)
- {
- mOwner->receivePluginMessage(message);
- }
- }
- }
- std::string LLPluginProcessParent::addSharedMemory(size_t size)
- {
- std::string name;
- LLPluginSharedMemory *region = new LLPluginSharedMemory;
- // This is a new region
- if(region->create(size))
- {
- name = region->getName();
- mSharedMemoryRegions.insert(sharedMemoryRegionsType::value_type(name, region));
- LLPluginMessage message(LLPLUGIN_MESSAGE_CLASS_INTERNAL, "shm_add");
- message.setValue("name", name);
- message.setValueS32("size", (S32)size);
- sendMessage(message);
- }
- else
- {
- LL_WARNS("Plugin") << "Couldn't create a shared memory segment!" << LL_ENDL;
- // Don't leak
- delete region;
- }
- return name;
- }
- void LLPluginProcessParent::removeSharedMemory(const std::string &name)
- {
- sharedMemoryRegionsType::iterator iter = mSharedMemoryRegions.find(name);
- if(iter != mSharedMemoryRegions.end())
- {
- // This segment exists. Send the message to the child to unmap it. The response will cause the parent to unmap our end.
- LLPluginMessage message(LLPLUGIN_MESSAGE_CLASS_INTERNAL, "shm_remove");
- message.setValue("name", name);
- sendMessage(message);
- }
- else
- {
- LL_WARNS("Plugin") << "Request to remove an unknown shared memory segment." << LL_ENDL;
- }
- }
- size_t LLPluginProcessParent::getSharedMemorySize(const std::string &name)
- {
- size_t result = 0;
- sharedMemoryRegionsType::iterator iter = mSharedMemoryRegions.find(name);
- if(iter != mSharedMemoryRegions.end())
- {
- result = iter->second->getSize();
- }
- return result;
- }
- void *LLPluginProcessParent::getSharedMemoryAddress(const std::string &name)
- {
- void *result = NULL;
- sharedMemoryRegionsType::iterator iter = mSharedMemoryRegions.find(name);
- if(iter != mSharedMemoryRegions.end())
- {
- result = iter->second->getMappedAddress();
- }
- return result;
- }
- std::string LLPluginProcessParent::getMessageClassVersion(const std::string &message_class)
- {
- std::string result;
- if(mMessageClassVersions.has(message_class))
- {
- result = mMessageClassVersions[message_class].asString();
- }
- return result;
- }
- std::string LLPluginProcessParent::getPluginVersion(void)
- {
- return mPluginVersionString;
- }
- void LLPluginProcessParent::setState(EState state)
- {
- LL_DEBUGS("Plugin") << "setting state to " << state << LL_ENDL;
- mState = state;
- };
- bool LLPluginProcessParent::pluginLockedUpOrQuit()
- {
- bool result = false;
- if(!mDisableTimeout && !mDebug)
- {
- if(!mProcess.isRunning())
- {
- LL_WARNS("Plugin") << "child exited" << llendl;
- result = true;
- }
- else if(pluginLockedUp())
- {
- LL_WARNS("Plugin") << "timeout" << llendl;
- result = true;
- }
- }
- return result;
- }
- bool LLPluginProcessParent::pluginLockedUp()
- {
- // If the timer is running and has expired, the plugin has locked up.
- return (mHeartbeat.getStarted() && mHeartbeat.hasExpired());
- }