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/*
* Copyright (C) 2012 Intel Corporation
*
* 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; either
* version 2.1 of the License, or (at your option) version 3.
*
* 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
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "session-helper.h"
#include <syncevo/Logging.h>
#include <syncevo/ForkExec.h>
#include <syncevo/SuspendFlags.h>
#include <syncevo/SyncContext.h>
#include <syncevo/LogRedirect.h>
using namespace SyncEvo;
using namespace GDBusCXX;
namespace {
GMainLoop *loop = NULL;
// that one is actually never called. probably a bug in ForkExec - it should
// call m_onFailure instead of throwing an exception
void onFailure(const std::string &error, bool &failed) throw ()
{
SE_LOG_DEBUG(NULL, "failure, quitting now: %s", error.c_str());
failed = true;
}
void onConnect(const DBusConnectionPtr &conn,
const boost::shared_ptr<LogRedirect> &parentLogger,
const boost::shared_ptr<ForkExecChild> &forkexec,
boost::shared_ptr<SessionHelper> &helper)
{
helper.reset(new SessionHelper(loop, conn, forkexec, parentLogger));
helper->activate();
}
void onAbort()
{
g_main_loop_quit(loop);
}
} // anonymous namespace
/**
* This program is a helper of syncevo-dbus-server which provides the
* Connection and Session DBus interfaces and runs individual sync
* sessions. It is only intended to be started by syncevo-dbus-server,
*/
int main(int argc, char **argv, char **envp)
{
// delay the client for debugging purposes
const char *delay = getenv("SYNCEVOLUTION_LOCAL_CHILD_DELAY");
if (delay) {
Sleep(atoi(delay));
}
SyncContext::initMain("syncevo-dbus-helper");
loop = g_main_loop_new(NULL, FALSE);
// Suspend and abort are signaled via SIGINT/SIGTERM
// respectively. SuspendFlags handle that for us.
SuspendFlags &s = SuspendFlags::getSuspendFlags();
s.setLevel(Logger::DEV);
boost::shared_ptr<SuspendFlags::Guard> guard = s.activate();
bool debug = getenv("SYNCEVOLUTION_DEBUG");
// Redirect both stdout and stderr. The only code
// writing to it should be third-party libraries
// which are unaware of the SyncEvolution logging system.
// Redirecting is useful to get such output into our
// sync logfile, once we have one.
boost::shared_ptr<LogRedirect> redirect;
PushLogger<LogRedirect> pushRedirect;
if (!debug) {
redirect.reset(new LogRedirect(LogRedirect::STDERR_AND_STDOUT));
pushRedirect.reset(redirect);
}
setvbuf(stderr, NULL, _IONBF, 0);
setvbuf(stdout, NULL, _IONBF, 0);
try {
if (debug) {
Logger::instance().setLevel(Logger::DEBUG);
Logger::setProcessName(StringPrintf("syncevo-dbus-helper-%ld", (long)getpid()));
}
// syncevo-dbus-helper produces the output which is of most
// interest to users, and therefore it is allowed to print
// [INFO/ERROR/DEBUG] without including a process name in
// the brackets, like the other processes do.
// Logger::setProcessName("syncevo-dbus-helper");
boost::shared_ptr<ForkExecChild> forkexec = ForkExecChild::create();
boost::shared_ptr<SessionHelper> helper;
bool failed = false;
forkexec->m_onConnect.connect(boost::bind(onConnect, _1, redirect,
boost::cref(forkexec),
boost::ref(helper)));
forkexec->m_onFailure.connect(boost::bind(onFailure, _2, boost::ref(failed)));
forkexec->connect();
// Run until we are connected, failed or get interrupted.
boost::signals2::connection c =
s.m_stateChanged.connect(boost::bind(&onAbort));
SE_LOG_DEBUG(NULL, "helper (pid %d) finished setup, waiting for parent connection", getpid());
while (true) {
if (s.getState() != SuspendFlags::NORMAL) {
// not an error, someone wanted us to stop
SE_LOG_DEBUG(NULL, "aborted via signal while starting, terminating");
// tell caller that we aborted by terminating via the SIGTERM signal
return 0;
}
if (failed) {
SE_THROW("parent connection failed");
}
if (helper) {
// done
break;
}
// wait
g_main_loop_run(loop);
}
// Now we no longer care whether the parent connection fails.
// TODO: What if the parent fails to call us and instead closes his
// side of the connection? Will we notice and abort?
c.disconnect();
SE_LOG_DEBUG(NULL, "connected to parent, run helper");
helper->run();
SE_LOG_DEBUG(NULL, "helper operation done");
helper.reset();
SE_LOG_DEBUG(NULL, "helper destroyed");
// Wait for confirmation from parent that we are allowed to
// quit. This is necessary because we might have pending IO
// for the parent, like D-Bus method replies.
while (true) {
if (s.getState() == SuspendFlags::ABORT) {
// not an error, someone wanted us to stop
SE_LOG_DEBUG(NULL, "aborted via signal after completing operation, terminating");
return 0;
}
if (forkexec->getState() != ForkExecChild::CONNECTED) {
// no point running any longer, parent is gone
SE_LOG_DEBUG(NULL, "parent has quit, terminating");
return 1;
}
g_main_context_iteration(NULL, true);
}
} catch ( const std::exception &ex ) {
SE_LOG_ERROR(NULL, "%s", ex.what());
} catch (...) {
SE_LOG_ERROR(NULL, "unknown error");
}
return 1;
}
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