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// mongo/shell/shell_utils_launcher.h
/*
* Copyright 2010 10gen Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include <boost/filesystem/convenience.hpp>
#include <boost/thread/recursive_mutex.hpp>
#include <map>
#include <sstream>
#include <string>
#include <vector>
#include <utility>
#include "mongo/bson/bsonobj.h"
#include "mongo/platform/process_id.h"
namespace mongo {
class Scope;
namespace shell_utils {
// Scoped management of mongo program instances. Simple implementation:
// destructor kills all mongod instances created by the shell.
struct MongoProgramScope {
MongoProgramScope() {} // Avoid 'unused variable' warning.
~MongoProgramScope();
};
void KillMongoProgramInstances();
void goingAwaySoon();
void installShellUtilsLauncher( Scope& scope );
/** Record log lines from concurrent programs. All public members are thread safe. */
class ProgramOutputMultiplexer {
public:
void appendLine( int port, ProcessId pid, const char *line );
/** @return up to 100000 characters of the most recent log output. */
std::string str() const;
void clear();
private:
std::stringstream _buffer;
};
/**
* A registry of spawned programs that are identified by a bound port or else a system pid.
* All public member functions are thread safe.
*
* TODO: Clean this up to make the semantics more consistent between pids and ports
*/
class ProgramRegistry {
public:
bool isPortRegistered( int port ) const;
/** @return pid for a registered port. */
ProcessId pidForPort( int port ) const;
/** @return port (-1 if doesn't exist) for a registered pid. */
int portForPid( ProcessId pid ) const;
/** Register an unregistered port. */
void registerPort( int port, ProcessId pid, int output );
void deletePort( int port );
void getRegisteredPorts( std::vector<int> &ports );
bool isPidRegistered( ProcessId pid ) const;
/** Register an unregistered pid. */
void registerPid( ProcessId pid, int output );
void deletePid( ProcessId pid );
void getRegisteredPids( vector<ProcessId> &pids );
private:
std::map<int,std::pair<ProcessId,int> > _ports;
std::map<ProcessId,int> _pids;
mutable boost::recursive_mutex _mutex;
#ifdef _WIN32
public:
std::map<ProcessId,HANDLE> _handles;
#endif
};
/** Helper class for launching a program and logging its output. */
class ProgramRunner {
public:
/** @param args The program's arguments, including the program name. */
ProgramRunner( const BSONObj &args );
/** Launch the program. */
void start();
/** Continuously read the program's output, generally from a special purpose thread. */
void operator()();
ProcessId pid() const { return _pid; }
int port() const { return _port; }
private:
boost::filesystem::path findProgram( const string &prog );
void launchProcess( int child_stdout );
std::vector<std::string> _argv;
int _port;
int _pipe;
ProcessId _pid;
};
}
}
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