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/*
* bitz-server, An ICAP server implementation in C++
* Copyright (C) 2012 Uditha Atukorala
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "manager.h"
#include "logger.h"
#include "util.h"
#include <cstdlib>
#include <sstream>
#include <csignal>
namespace bitz {
Manager::Manager( unsigned short port, const std::string &address, int backlog ) throw( ManagerException ) {
// initialise manager
_manager.worker = false;
_manager.max_workers = 0;
_manager.workers_count = 0;
_manager.worker_id = 0;
_manager.socket = NULL;
_manager.worker_pool = NULL;
// initialise listening socket
try {
if ( address.empty() ) {
_manager.socket = new socketlibrary::TCPServerSocket( port, backlog );
} else {
_manager.socket = new socketlibrary::TCPServerSocket( address, port, backlog );
}
} catch ( socketlibrary::SocketException &sex ) {
throw ManagerException( "failed to initialise socket" );
}
Logger &logger = Logger::instance();
logger.debug( "manager initialised" );
}
Manager::~Manager() {
Logger &logger = Logger::instance();
if ( _manager.worker ) {
logger.debug( "[worker] cleaning up manager" );
} else {
logger.debug( "[manager] shutting down manager" );
}
delete [] _manager.worker_pool;
delete _manager.socket;
}
void Manager::spawn( unsigned int max_workers, unsigned int max_worker_requests ) throw( ManagerException ) {
_manager.max_workers = max_workers;
_manager.max_worker_requests = max_worker_requests;
_manager.worker_pool = new worker_pool_t[max_workers];
// pre-fork workers
if (! _manager.worker ) {
for ( unsigned int i = 0; i < max_workers; i++ ) {
try {
spawn_worker( i );
} catch ( ManagerException &mex ) {
throw mex;
}
}
}
}
void Manager::spawn_worker( unsigned int worker_id ) throw( ManagerException ) {
Logger &logger = Logger::instance();
pid_t worker_pid;
// create a worker child
worker_pid = fork();
if ( worker_pid == -1 ) {
throw ManagerException( "failed to create worker", true );
}
if ( worker_pid == 0 ) {
/* worker */
_manager.worker = true;
_manager.worker_id = worker_id;
_manager.worker_pool[worker_id].worker = new Worker();
_manager.worker_pool[worker_id].worker_id = worker_id;
_manager.worker_pool[worker_id].worker_pid = worker_pid;
_manager.worker_pool[worker_id].worker->run( _manager.socket, _manager.max_worker_requests );
logger.info( std::string( "end of cycle, worker[" ).append( util::itoa( worker_id ) ).append( "]" ) );
delete _manager.worker_pool[worker_id].worker;
_exit( EXIT_SUCCESS );
} else {
/* manager */
logger.info( std::string( "[manager] worker spawned with pid: " ).append( util::itoa( worker_pid) ) );
_manager.workers_count++;
_manager.worker = false;
_manager.worker_pool[worker_id].worker = NULL;
_manager.worker_pool[worker_id].worker_id = worker_id;
_manager.worker_pool[worker_id].worker_pid = worker_pid;
}
}
void Manager::shutdown( bool graceful ) throw() {
// logger
Logger &logger = Logger::instance();
if ( _manager.worker ) {
logger.info( "[worker] manager shutdown request received" );
/* worker: cleanup */
delete _manager.worker_pool[_manager.worker_id].worker;
} else {
/* manager: stop all child processes */
logger.info( "[manager] shutdown request received" );
for (unsigned int i = 0; i < _manager.max_workers; i++ ) {
if ( _manager.worker_pool[i].worker_pid != 0 ) {
if ( graceful ) {
kill( _manager.worker_pool[i].worker_pid, SIGTERM );
logger.debug( std::string( "[manager] sending SIGTERM to worker[" ).append( util::itoa( i ) )
.append( "], pid: " ).append( util::itoa( _manager.worker_pool[i].worker_pid ) ) );
} else {
kill( _manager.worker_pool[i].worker_pid, SIGKILL );
logger.debug( std::string( "[manager] sending SIGKILL to worker[" ).append( util::itoa( i ) )
.append( "], pid: " ).append( util::itoa( _manager.worker_pool[i].worker_pid ) ) );
}
} else {
logger.debug( std::string( "[manager] worker[" ).append( util::itoa( i ) ).append( "] already closed" ) );
}
}
}
}
void Manager::reap_worker( pid_t worker_pid ) throw() {
// logger
Logger &logger = Logger::instance();
logger.debug( std::string( "reaping worker, pid: " ).append( util::itoa( worker_pid ) ) );
if (! _manager.worker ) {
for (unsigned int i = 0; i < _manager.max_workers; i++ ) {
if ( _manager.worker_pool[i].worker_pid == worker_pid ) {
// reap the dead worker
_manager.worker_pool[i].worker_pid = 0;
_manager.workers_count--;
// break out the loop
break;
}
}
}
}
void Manager::manager_workers() throw() {
if (! _manager.worker ) {
// check the worker count
while ( _manager.workers_count != _manager.max_workers ) {
// we are missing workers, find out who
for (unsigned int i = 0; i < _manager.max_workers; i++ ) {
if ( _manager.worker_pool[i].worker_pid == 0 ) {
// spawn a worker for the missing
spawn_worker( i );
}
}
}
}
}
} /* end of namespace bitz */
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