libreoffice-online/loolwsd/LOOLForKit.cpp

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*/
/*
* A very simple, single threaded helper to efficiently pre-init and
* spawn lots of kits as children.
*/
#include <sys/capability.h>
#include <sys/wait.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <cstdlib>
#include <cstring>
#include <atomic>
#include <iostream>
#include <Poco/Path.h>
#include <Poco/Process.h>
#include <Poco/StringTokenizer.h>
#include <Poco/Thread.h>
#include <Poco/Util/Application.h>
#include "Common.hpp"
#include "IoUtil.hpp"
#include "LOOLKit.hpp"
#include "Util.hpp"
#include "Unit.hpp"
#include "ChildProcessSession.hpp"
using Poco::Path;
using Poco::Process;
using Poco::StringTokenizer;
using Poco::Thread;
using Poco::Timestamp;
using Poco::Util::Application;
static std::string UnitTestLibrary;
static std::atomic<unsigned> ForkCounter( 0 );
static int pipeFd = -1;
class ChildDispatcher
{
public:
ChildDispatcher() :
_wsdPipeReader("wsd_pipe_rd", pipeFd)
{
}
/// Polls WSD commands and dispatches them to the appropriate child.
bool pollAndDispatch()
{
return _wsdPipeReader.processOnce([this](std::string& message) { handleInput(message); return true; },
[]() { return TerminationFlag; });
}
private:
void handleInput(const std::string& message)
{
Log::info("ForKit command: [" + message + "].");
StringTokenizer tokens(message, " ", StringTokenizer::TOK_IGNORE_EMPTY | StringTokenizer::TOK_TRIM);
if (tokens[0] == "spawn" && tokens.count() == 2)
{
const auto count = std::stoi(tokens[1]);
if (count > 0)
{
Log::info("Spawning " + tokens[1] + " children per request.");
ForkCounter = count;
}
else
{
Log::warn("Cannot spawn " + std::to_string(count) + " children as requested.");
}
}
}
private:
IoUtil::PipeReader _wsdPipeReader;
};
static int createLibreOfficeKit(const std::string& childRoot,
const std::string& sysTemplate,
const std::string& loTemplate,
const std::string& loSubPath)
{
Log::debug("Forking a loolkit process.");
Process::PID pid;
if (!(pid = fork()))
{
// quicker than a generic socket closing approach.
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// (but pipeFd is a pipe, not a socket...?)
close(pipeFd);
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UnitKit::get().postFork();
// child
if (std::getenv("SLEEPKITFORDEBUGGER"))
{
std::cerr << "Sleeping " << std::getenv("SLEEPKITFORDEBUGGER")
<< " seconds to give you time to attach debugger to process "
<< Process::id() << std::endl;
Thread::sleep(std::stoul(std::getenv("SLEEPKITFORDEBUGGER")) * 1000);
}
lokit_main(childRoot, sysTemplate, loTemplate, loSubPath);
}
else
{
// parent
if (pid < 0)
Log::syserror("Fork failed.");
else
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Log::info("Forked kit [" + std::to_string(pid) + "].");
}
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return pid;
}
static void printArgumentHelp()
{
std::cout << "Usage: loolforkit [OPTION]..." << std::endl;
std::cout << " Single-threaded process that spawns lok instances" << std::endl;
std::cout << " Note: Running this standalone is not possible. It is spawned by loolwsd" << std::endl;
std::cout << " and is controlled via a pipe." << std::endl;
std::cout << "" << std::endl;
}
int main(int argc, char** argv)
{
if (std::getenv("SLEEPFORDEBUGGER"))
{
std::cerr << "Sleeping " << std::getenv("SLEEPFORDEBUGGER")
<< " seconds to give you time to attach debugger to process "
<< Process::id() << std::endl;
Thread::sleep(std::stoul(std::getenv("SLEEPFORDEBUGGER")) * 1000);
}
// Initialization
Log::initialize("brk");
Util::setTerminationSignals();
Util::setFatalSignals();
// Auto-reap zombies.
if (signal(SIGCHLD, SIG_IGN) == SIG_ERR)
{
Log::syserror("Failed to set SIGCHLD to SIG_IGN.");
return 1;
}
std::string childRoot;
std::string loSubPath;
std::string sysTemplate;
std::string loTemplate;
for (int i = 0; i < argc; ++i)
{
char *cmd = argv[i];
char *eq;
if (std::strstr(cmd, "--losubpath=") == cmd)
{
eq = std::strchr(cmd, '=');
loSubPath = std::string(eq+1);
}
else if (std::strstr(cmd, "--systemplate=") == cmd)
{
eq = std::strchr(cmd, '=');
sysTemplate = std::string(eq+1);
}
else if (std::strstr(cmd, "--lotemplate=") == cmd)
{
eq = std::strchr(cmd, '=');
loTemplate = std::string(eq+1);
}
else if (std::strstr(cmd, "--childroot=") == cmd)
{
eq = std::strchr(cmd, '=');
childRoot = std::string(eq+1);
}
else if (std::strstr(cmd, "--clientport=") == cmd)
{
eq = std::strchr(cmd, '=');
ClientPortNumber = std::stoll(std::string(eq+1));
}
else if (std::strstr(cmd, "--unitlib=") == cmd)
{
eq = std::strchr(cmd, '=');
UnitTestLibrary = std::string(eq+1);
}
}
if (loSubPath.empty() || sysTemplate.empty() ||
loTemplate.empty() || childRoot.empty())
{
printArgumentHelp();
return 1;
}
if (!UnitBase::init(UnitBase::UnitType::TYPE_KIT,
UnitTestLibrary))
{
Log::error("Failed to load kit unit test library");
return Application::EXIT_USAGE;
}
if (!std::getenv("LD_BIND_NOW"))
Log::info("Note: LD_BIND_NOW is not set.");
if (!std::getenv("LOK_VIEW_CALLBACK"))
Log::info("Note: LOK_VIEW_CALLBACK is not set.");
const Path pipePath = Path::forDirectory(childRoot + Path::separator() + FIFO_PATH);
const std::string pipeLoolwsd = Path(pipePath, FIFO_LOOLWSD).toString();
if ( (pipeFd = open(pipeLoolwsd.c_str(), O_RDONLY) ) < 0 )
{
Log::syserror("Failed to open pipe [" + pipeLoolwsd + "] for reading. Exiting.");
std::exit(Application::EXIT_SOFTWARE);
}
// Initialize LoKit
if (!globalPreinit(loTemplate))
std::exit(Application::EXIT_SOFTWARE);
Log::info("Preinit stage OK.");
// We must have at least one child, more are created dynamically.
if (createLibreOfficeKit(childRoot, sysTemplate, loTemplate, loSubPath) < 0)
{
Log::error("Failed to create a kit process.");
std::exit(Application::EXIT_SOFTWARE);
}
ChildDispatcher childDispatcher;
Log::info("ForKit process is ready.");
while (!TerminationFlag)
{
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UnitKit::get().invokeForKitTest();
if (!childDispatcher.pollAndDispatch())
{
Log::info("Child dispatcher flagged for termination.");
break;
}
if (ForkCounter > 0)
{
// Create as many as requested.
int spawn = ForkCounter;
Log::info() << "Creating " << spawn << " new child." << Log::end;
size_t newInstances = 0;
do
{
if (createLibreOfficeKit(childRoot, sysTemplate, loTemplate, loSubPath) < 0)
{
Log::error("Failed to create a kit process.");
}
else
{
++newInstances;
}
}
while (--spawn > 0);
// If we need to spawn more, retry later.
ForkCounter = (newInstances >= ForkCounter ? 0 : ForkCounter - newInstances);
}
}
close(pipeFd);
int returnValue = Application::EXIT_OK;
UnitKit::get().returnValue(returnValue);
Log::info("ForKit process finished.");
return returnValue;
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */