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/**
* Copyright (C) 2008 10gen Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects
* for all of the code used other than as permitted herein. If you modify
* file(s) with this exception, you may extend this exception to your
* version of the file(s), but you are not obligated to do so. If you do not
* wish to do so, delete this exception statement from your version. If you
* delete this exception statement from all source files in the program,
* then also delete it in the license file.
*/
#define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kDefault
#include "mongo/pch.h"
#include <boost/thread.hpp>
#include "mongo/base/initializer.h"
#include "mongo/client/dbclientinterface.h"
#include "mongo/db/dbmessage.h"
#include "mongo/tools/mongobridge_options.h"
#include "mongo/util/log.h"
#include "mongo/util/net/listen.h"
#include "mongo/util/net/message.h"
#include "mongo/util/stacktrace.h"
#include "mongo/util/quick_exit.h"
#include "mongo/util/text.h"
#include "mongo/util/timer.h"
using namespace mongo;
using namespace std;
void cleanup( int sig );
class Forwarder {
public:
Forwarder( MessagingPort &mp ) : mp_( mp ) {
}
void operator()() const {
DBClientConnection dest;
string errmsg;
Timer connectTimer;
while (!dest.connect(HostAndPort(mongoBridgeGlobalParams.destUri), errmsg)) {
// If we can't connect for the configured timeout, give up
//
if (connectTimer.seconds() >= mongoBridgeGlobalParams.connectTimeoutSec) {
cout << "Unable to establish connection from " << mp_.psock->remoteString()
<< " to " << mongoBridgeGlobalParams.destUri
<< " after " << connectTimer.seconds() << " seconds. Giving up." << endl;
mp_.shutdown();
return;
}
sleepmillis(500);
}
Message m;
while( 1 ) {
try {
m.reset();
if ( !mp_.recv( m ) ) {
cout << "end connection " << mp_.psock->remoteString() << endl;
mp_.shutdown();
break;
}
sleepmillis(mongoBridgeGlobalParams.delay);
int oldId = m.header().getId();
if ( m.operation() == dbQuery || m.operation() == dbMsg || m.operation() == dbGetMore ) {
bool exhaust = false;
if ( m.operation() == dbQuery ) {
DbMessage d( m );
QueryMessage q( d );
exhaust = q.queryOptions & QueryOption_Exhaust;
}
Message response;
dest.port().call( m, response );
// nothing to reply with?
if ( response.empty() ) cleanup(0);
mp_.reply( m, response, oldId );
while ( exhaust ) {
MsgData::View header = response.header();
QueryResult::View qr = header.view2ptr();
if ( qr.getCursorId() ) {
response.reset();
dest.port().recv( response );
mp_.reply( m, response ); // m argument is ignored anyway
}
else {
exhaust = false;
}
}
}
else {
dest.port().say( m, oldId );
}
}
catch ( ... ) {
log() << "caught exception in Forwarder, continuing" << endl;
}
}
}
private:
MessagingPort &mp_;
};
set<MessagingPort*>& ports ( *(new std::set<MessagingPort*>()) );
class MyListener : public Listener {
public:
MyListener( int port ) : Listener( "bridge" , "", port ) {}
virtual void acceptedMP(MessagingPort *mp) {
ports.insert( mp );
Forwarder f( *mp );
boost::thread t( f );
}
};
auto_ptr< MyListener > listener;
void cleanup( int sig ) {
ListeningSockets::get()->closeAll();
for ( set<MessagingPort*>::iterator i = ports.begin(); i != ports.end(); i++ )
(*i)->shutdown();
quickExit( 0 );
}
#if !defined(_WIN32)
void myterminate() {
printStackTrace(severe().stream() << "bridge terminate() called, printing stack:\n");
::abort();
}
void setupSignals() {
signal( SIGINT , cleanup );
signal( SIGTERM , cleanup );
signal( SIGPIPE , cleanup );
signal( SIGABRT , cleanup );
signal( SIGSEGV , cleanup );
signal( SIGBUS , cleanup );
signal( SIGFPE , cleanup );
set_terminate( myterminate );
}
#else
inline void setupSignals() {}
#endif
int toolMain( int argc, char **argv, char** envp ) {
mongo::runGlobalInitializersOrDie(argc, argv, envp);
static StaticObserver staticObserver;
setupSignals();
listener.reset(new MyListener(mongoBridgeGlobalParams.port));
listener->setupSockets();
listener->initAndListen();
return 0;
}
#if defined(_WIN32)
// In Windows, wmain() is an alternate entry point for main(), and receives the same parameters
// as main() but encoded in Windows Unicode (UTF-16); "wide" 16-bit wchar_t characters. The
// WindowsCommandLine object converts these wide character strings to a UTF-8 coded equivalent
// and makes them available through the argv() and envp() members. This enables toolMain()
// to process UTF-8 encoded arguments and environment variables without regard to platform.
int wmain(int argc, wchar_t* argvW[], wchar_t* envpW[]) {
WindowsCommandLine wcl(argc, argvW, envpW);
int exitCode = toolMain(argc, wcl.argv(), wcl.envp());
quickExit(exitCode);
}
#else
int main(int argc, char* argv[], char** envp) {
int exitCode = toolMain(argc, argv, envp);
quickExit(exitCode);
}
#endif
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