[melted] / src / miracle / miracle_server.c

/*
 * miracle_server.c -- DV Server
 * Copyright (C) 2002-2003 Ushodaya Enterprises Limited
 * Author: Charles Yates <charles.yates@pandora.be>
 *
 * 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 2 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.
 */

/* System header files */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>

#include <fcntl.h>
#include <pthread.h>
#include <signal.h>
#include <stdlib.h>
#include <unistd.h>

#include <string.h>
#include <netinet/in.h>
#include <netdb.h>
#include <errno.h>
#include <arpa/inet.h>

/* Application header files */
#include "miracle_server.h"
#include "miracle_connection.h"
#include "miracle_local.h"
#include "miracle_log.h"
#include <valerie/valerie_remote.h>
#include <valerie/valerie_tokeniser.h>

#define VERSION "0.0.1"

static void miracle_command_received( mlt_listener listener, mlt_properties owner, miracle_server this, void **args )
{
        if ( listener != NULL )
                listener( owner, this, ( valerie_response ** )args[ 0 ], ( char * )args[ 1 ] );
}

static void miracle_doc_received( mlt_listener listener, mlt_properties owner, miracle_server this, void **args )
{
        if ( listener != NULL )
                listener( owner, this, ( valerie_response ** )args[ 0 ], ( char * )args[ 1 ], ( char * )args[ 2 ] );
}

static void miracle_push_received( mlt_listener listener, mlt_properties owner, miracle_server this, void **args )
{
        if ( listener != NULL )
                listener( owner, this, ( valerie_response ** )args[ 0 ], ( char * )args[ 1 ], ( mlt_service )args[ 2 ] );
}

/** Initialise a server structure.
*/

miracle_server miracle_server_init( char *id )
{
        miracle_server server = malloc( sizeof( miracle_server_t ) );
        if ( server != NULL )
                memset( server, 0, sizeof( miracle_server_t ) );
        if ( server != NULL && mlt_properties_init( &server->parent, server ) == 0 )
        {
                server->id = id;
                server->port = DEFAULT_TCP_PORT;
                server->socket = -1;
                server->shutdown = 1;
                mlt_events_init( &server->parent );
                mlt_events_register( &server->parent, "command-received", ( mlt_transmitter )miracle_command_received );
                mlt_events_register( &server->parent, "doc-received", ( mlt_transmitter )miracle_doc_received );
                mlt_events_register( &server->parent, "push-received", ( mlt_transmitter )miracle_push_received );
        }
        return server;
}

void miracle_server_set_config( miracle_server server, char *config )
{
        if ( server != NULL )
        {
                free( server->config );
                server->config = config != NULL ? strdup( config ) : NULL;
        }
}

/** Set the port of the server.
*/

void miracle_server_set_port( miracle_server server, int port )
{
        server->port = port;
}

void miracle_server_set_proxy( miracle_server server, char *proxy )
{
        valerie_tokeniser tokeniser = valerie_tokeniser_init( );
        server->proxy = 1;
        server->remote_port = DEFAULT_TCP_PORT;
        valerie_tokeniser_parse_new( tokeniser, proxy, ":" );
        strcpy( server->remote_server, valerie_tokeniser_get_string( tokeniser, 0 ) );
        if ( valerie_tokeniser_count( tokeniser ) == 2 )
                server->remote_port = atoi( valerie_tokeniser_get_string( tokeniser, 1 ) );
        valerie_tokeniser_close( tokeniser );
}

/** Wait for a connection.
*/

static int miracle_server_wait_for_connect( miracle_server server )
{
    struct timeval tv;
    fd_set rfds;

    /* Wait for a 1 second. */
    tv.tv_sec = 1;
    tv.tv_usec = 0;

    FD_ZERO( &rfds );
    FD_SET( server->socket, &rfds );

    return select( server->socket + 1, &rfds, NULL, NULL, &tv);
}

/** Run the server thread.
*/

static void *miracle_server_run( void *arg )
{
        miracle_server server = arg;
        pthread_t cmd_parse_info;
        connection_t *tmp = NULL;
        pthread_attr_t thread_attributes;
        int socksize;

        socksize = sizeof( struct sockaddr );

        miracle_log( LOG_NOTICE, "%s version %s listening on port %i", server->id, VERSION, server->port );

        /* Create the initial thread. We want all threads to be created detached so
           their resources get freed automatically. (CY: ... hmmph...) */
        pthread_attr_init( &thread_attributes );
        pthread_attr_setdetachstate( &thread_attributes, PTHREAD_CREATE_DETACHED );
        pthread_attr_init( &thread_attributes );
        pthread_attr_setinheritsched( &thread_attributes, PTHREAD_INHERIT_SCHED );
        /* pthread_attr_setschedpolicy( &thread_attributes, SCHED_RR ); */

        while ( !server->shutdown )
        {
                /* Wait for a new connection. */
                if ( miracle_server_wait_for_connect( server ) )
                {
                        /* Create a new block of data to hold a copy of the incoming connection for
                           our server thread. The thread should free this when it terminates. */

                        tmp = (connection_t*) malloc( sizeof(connection_t) );
                        tmp->owner = &server->parent;
                        tmp->parser = server->parser;
                        tmp->fd = accept( server->socket, (struct sockaddr*) &(tmp->sin), &socksize );

                        /* Pass the connection to a parser thread :-/ */
                        if ( tmp->fd != -1 )
                                pthread_create( &cmd_parse_info, &thread_attributes, parser_thread, tmp );
                }
        }

        miracle_log( LOG_NOTICE, "%s version %s server terminated.", server->id, VERSION );

        return NULL;
}

/** Execute the server thread.
*/

int miracle_server_execute( miracle_server server )
{
        int error = 0;
        valerie_response response = NULL;
        int index = 0;
        struct sockaddr_in ServerAddr;
        int flag = 1;

        server->shutdown = 0;

        ServerAddr.sin_family = AF_INET;
        ServerAddr.sin_port = htons( server->port );
        ServerAddr.sin_addr.s_addr = INADDR_ANY;
        
        /* Create socket, and bind to port. Listen there. Backlog = 5
           should be sufficient for listen (). */
        server->socket = socket( AF_INET, SOCK_STREAM, 0 );

        if ( server->socket == -1 )
        {
                server->shutdown = 1;
                perror( "socket" );
                miracle_log( LOG_ERR, "%s unable to create socket.", server->id );
                return -1;
        }

    setsockopt( server->socket, SOL_SOCKET, SO_REUSEADDR, (char *)&flag, sizeof( int ) );

        if ( bind( server->socket, (struct sockaddr *) &ServerAddr, sizeof (ServerAddr) ) != 0 )
        {
                server->shutdown = 1;
                perror( "bind" );
                miracle_log( LOG_ERR, "%s unable to bind to port %d.", server->id, server->port );
                return -1;
        }

        if ( listen( server->socket, 5 ) != 0 )
        {
                server->shutdown = 1;
                perror( "listen" );
                miracle_log( LOG_ERR, "%s unable to listen on port %d.", server->id, server->port );
                return -1;
        }

        fcntl( server->socket, F_SETFL, O_NONBLOCK );

        if ( !server->proxy )
        {
                miracle_log( LOG_NOTICE, "Starting server on %d.", server->port );
                server->parser = miracle_parser_init_local( );
        }
        else
        {
                miracle_log( LOG_NOTICE, "Starting proxy for %s:%d on %d.", server->remote_server, server->remote_port, server->port );
                server->parser = valerie_parser_init_remote( server->remote_server, server->remote_port );
        }

        response = valerie_parser_connect( server->parser );

        if ( response != NULL && valerie_response_get_error_code( response ) == 100 )
        {
                /* read configuration file */
                if ( response != NULL && !server->proxy && server->config != NULL )
                {
                        valerie_response_close( response );
                        response = valerie_parser_run( server->parser, server->config );

                        if ( valerie_response_count( response ) > 1 )
                        {
                                if ( valerie_response_get_error_code( response ) > 299 )
                                        miracle_log( LOG_ERR, "Error evaluating server configuration. Processing stopped." );
                                for ( index = 0; index < valerie_response_count( response ); index ++ )
                                        miracle_log( LOG_DEBUG, "%4d: %s", index, valerie_response_get_line( response, index ) );
                        }
                }

                if ( response != NULL )
                {
                        pthread_attr_t attr;
                        int result;
                        pthread_attr_init( &attr );
                        pthread_attr_setdetachstate( &attr, PTHREAD_CREATE_JOINABLE );
                        pthread_attr_setinheritsched( &attr, PTHREAD_EXPLICIT_SCHED );
                        pthread_attr_setschedpolicy( &attr, SCHED_FIFO );
                        pthread_attr_setscope( &attr, PTHREAD_SCOPE_SYSTEM );
                        valerie_response_close( response );
                        result = pthread_create( &server->thread, &attr, miracle_server_run, server );
                        if ( result )
                        {
                                miracle_log( LOG_WARNING, "Failed to schedule realtime (%s)", strerror(errno) );
                                pthread_attr_setschedpolicy( &attr, SCHED_OTHER );
                                result = pthread_create( &server->thread, &attr, miracle_server_run, server );
                                if ( result )
                                {
                                        miracle_log( LOG_CRIT, "Failed to launch TCP listener thread" );
                                        error = -1;
                                }
                        }
                }
        }
        else
        {
                miracle_log( LOG_ERR, "Error connecting to parser. Processing stopped." );
                server->shutdown = 1;
                error = -1;
        }

        return error;
}

/** Shutdown the server.
*/

void miracle_server_shutdown( miracle_server server )
{
        if ( server != NULL && !server->shutdown )
        {
                server->shutdown = 1;
                pthread_join( server->thread, NULL );
                miracle_server_set_config( server, NULL );
                valerie_parser_close( server->parser );
                server->parser = NULL;
                close( server->socket );
        }
}

/** Close the server.
*/

void miracle_server_close( miracle_server server )
{
        if ( server != NULL && mlt_properties_dec_ref( &server->parent ) <= 0 )
        {
                mlt_properties_close( &server->parent );
                miracle_server_shutdown( server );
                free( server );
        }
}