research.m1stereo.tv/gitweb/ - melted/blob - src/miracle/miracle_server.c

   1 /*
   2  * miracle_server.c -- DV Server
   3  * Copyright (C) 2002-2003 Ushodaya Enterprises Limited
   4  * Author: Charles Yates <charles.yates@pandora.be>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software Foundation,
  18  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19  */
  20
  21 /* System header files */
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <string.h>
  25 #include <signal.h>
  26
  27 #include <fcntl.h>
  28 #include <pthread.h>
  29 #include <signal.h>
  30 #include <stdlib.h>
  31 #include <unistd.h>
  32
  33 #include <string.h>
  34 #include <netinet/in.h>
  35 #include <netdb.h>
  36 #include <errno.h>
  37 #include <arpa/inet.h>
  38
  39 /* Application header files */
  40 #include "miracle_server.h"
  41 #include "miracle_connection.h"
  42 #include "miracle_local.h"
  43 #include "miracle_log.h"
  44 #include <valerie/valerie_remote.h>
  45 #include <valerie/valerie_tokeniser.h>
  46
  47 #define VERSION "0.0.1"
  48
  49 static void miracle_command_received( mlt_listener listener, mlt_properties owner, miracle_server this, void **args )
  50 {
  51         if ( listener != NULL )
  52                 listener( owner, this, ( valerie_response ** )args[ 0 ], ( char * )args[ 1 ] );
  53 }
  54
  55 static void miracle_doc_received( mlt_listener listener, mlt_properties owner, miracle_server this, void **args )
  56 {
  57         if ( listener != NULL )
  58                 listener( owner, this, ( valerie_response ** )args[ 0 ], ( char * )args[ 1 ], ( char * )args[ 2 ] );
  59 }
  60
  61 static void miracle_push_received( mlt_listener listener, mlt_properties owner, miracle_server this, void **args )
  62 {
  63         if ( listener != NULL )
  64                 listener( owner, this, ( valerie_response ** )args[ 0 ], ( char * )args[ 1 ], ( mlt_service )args[ 2 ] );
  65 }
  66
  67 /** Initialise a server structure.
  68 */
  69
  70 miracle_server miracle_server_init( char *id )
  71 {
  72         miracle_server server = malloc( sizeof( miracle_server_t ) );
  73         if ( server != NULL )
  74                 memset( server, 0, sizeof( miracle_server_t ) );
  75         if ( server != NULL && mlt_properties_init( &server->parent, server ) == 0 )
  76         {
  77                 server->id = id;
  78                 server->port = DEFAULT_TCP_PORT;
  79                 server->socket = -1;
  80                 server->shutdown = 1;
  81                 mlt_events_init( &server->parent );
  82                 mlt_events_register( &server->parent, "command-received", ( mlt_transmitter )miracle_command_received );
  83                 mlt_events_register( &server->parent, "doc-received", ( mlt_transmitter )miracle_doc_received );
  84                 mlt_events_register( &server->parent, "push-received", ( mlt_transmitter )miracle_push_received );
  85         }
  86         return server;
  87 }
  88
  89 const char *miracle_server_id( miracle_server server )
  90 {
  91         return server != NULL && server->id != NULL ? server->id : "miracle";
  92 }
  93
  94 void miracle_server_set_config( miracle_server server, char *config )
  95 {
  96         if ( server != NULL )
  97         {
  98                 free( server->config );
  99                 server->config = config != NULL ? strdup( config ) : NULL;
 100         }
 101 }
 102
 103 /** Set the port of the server.
 104 */
 105
 106 void miracle_server_set_port( miracle_server server, int port )
 107 {
 108         server->port = port;
 109 }
 110
 111 void miracle_server_set_proxy( miracle_server server, char *proxy )
 112 {
 113         valerie_tokeniser tokeniser = valerie_tokeniser_init( );
 114         server->proxy = 1;
 115         server->remote_port = DEFAULT_TCP_PORT;
 116         valerie_tokeniser_parse_new( tokeniser, proxy, ":" );
 117         strcpy( server->remote_server, valerie_tokeniser_get_string( tokeniser, 0 ) );
 118         if ( valerie_tokeniser_count( tokeniser ) == 2 )
 119                 server->remote_port = atoi( valerie_tokeniser_get_string( tokeniser, 1 ) );
 120         valerie_tokeniser_close( tokeniser );
 121 }
 122
 123 /** Wait for a connection.
 124 */
 125
 126 static int miracle_server_wait_for_connect( miracle_server server )
 127 {
 128     struct timeval tv;
 129     fd_set rfds;
 130
 131     /* Wait for a 1 second. */
 132     tv.tv_sec = 1;
 133     tv.tv_usec = 0;
 134
 135     FD_ZERO( &rfds );
 136     FD_SET( server->socket, &rfds );
 137
 138     return select( server->socket + 1, &rfds, NULL, NULL, &tv);
 139 }
 140
 141 /** Run the server thread.
 142 */
 143
 144 static void *miracle_server_run( void *arg )
 145 {
 146         miracle_server server = arg;
 147         pthread_t cmd_parse_info;
 148         connection_t *tmp = NULL;
 149         pthread_attr_t thread_attributes;
 150         int socksize;
 151
 152         socksize = sizeof( struct sockaddr );
 153
 154         miracle_log( LOG_NOTICE, "%s version %s listening on port %i", server->id, VERSION, server->port );
 155
 156         /* Create the initial thread. We want all threads to be created detached so
 157            their resources get freed automatically. (CY: ... hmmph...) */
 158         pthread_attr_init( &thread_attributes );
 159         pthread_attr_setdetachstate( &thread_attributes, PTHREAD_CREATE_DETACHED );
 160         pthread_attr_init( &thread_attributes );
 161         pthread_attr_setinheritsched( &thread_attributes, PTHREAD_INHERIT_SCHED );
 162         /* pthread_attr_setschedpolicy( &thread_attributes, SCHED_RR ); */
 163
 164         while ( !server->shutdown )
 165         {
 166                 /* Wait for a new connection. */
 167                 if ( miracle_server_wait_for_connect( server ) )
 168                 {
 169                         /* Create a new block of data to hold a copy of the incoming connection for
 170                            our server thread. The thread should free this when it terminates. */
 171
 172                         tmp = (connection_t*) malloc( sizeof(connection_t) );
 173                         tmp->owner = &server->parent;
 174                         tmp->parser = server->parser;
 175                         tmp->fd = accept( server->socket, (struct sockaddr*) &(tmp->sin), &socksize );
 176
 177                         /* Pass the connection to a parser thread :-/ */
 178                         if ( tmp->fd != -1 )
 179                                 pthread_create( &cmd_parse_info, &thread_attributes, parser_thread, tmp );
 180                 }
 181         }
 182
 183         miracle_log( LOG_NOTICE, "%s version %s server terminated.", server->id, VERSION );
 184
 185         return NULL;
 186 }
 187
 188 /** Execute the server thread.
 189 */
 190
 191 int miracle_server_execute( miracle_server server )
 192 {
 193         int error = 0;
 194         valerie_response response = NULL;
 195         int index = 0;
 196         struct sockaddr_in ServerAddr;
 197         int flag = 1;
 198
 199         server->shutdown = 0;
 200
 201         ServerAddr.sin_family = AF_INET;
 202         ServerAddr.sin_port = htons( server->port );
 203         ServerAddr.sin_addr.s_addr = INADDR_ANY;
 204
 205         /* Create socket, and bind to port. Listen there. Backlog = 5
 206            should be sufficient for listen (). */
 207         server->socket = socket( AF_INET, SOCK_STREAM, 0 );
 208
 209         if ( server->socket == -1 )
 210         {
 211                 server->shutdown = 1;
 212                 perror( "socket" );
 213                 miracle_log( LOG_ERR, "%s unable to create socket.", server->id );
 214                 return -1;
 215         }
 216
 217     setsockopt( server->socket, SOL_SOCKET, SO_REUSEADDR, (char *)&flag, sizeof( int ) );
 218
 219         if ( bind( server->socket, (struct sockaddr *) &ServerAddr, sizeof (ServerAddr) ) != 0 )
 220         {
 221                 server->shutdown = 1;
 222                 perror( "bind" );
 223                 miracle_log( LOG_ERR, "%s unable to bind to port %d.", server->id, server->port );
 224                 return -1;
 225         }
 226
 227         if ( listen( server->socket, 5 ) != 0 )
 228         {
 229                 server->shutdown = 1;
 230                 perror( "listen" );
 231                 miracle_log( LOG_ERR, "%s unable to listen on port %d.", server->id, server->port );
 232                 return -1;
 233         }
 234
 235         fcntl( server->socket, F_SETFL, O_NONBLOCK );
 236
 237         if ( !server->proxy )
 238         {
 239                 miracle_log( LOG_NOTICE, "Starting server on %d.", server->port );
 240                 server->parser = miracle_parser_init_local( );
 241         }
 242         else
 243         {
 244                 miracle_log( LOG_NOTICE, "Starting proxy for %s:%d on %d.", server->remote_server, server->remote_port, server->port );
 245                 server->parser = valerie_parser_init_remote( server->remote_server, server->remote_port );
 246         }
 247
 248         response = valerie_parser_connect( server->parser );
 249
 250         if ( response != NULL && valerie_response_get_error_code( response ) == 100 )
 251         {
 252                 /* read configuration file */
 253                 if ( response != NULL && !server->proxy && server->config != NULL )
 254                 {
 255                         valerie_response_close( response );
 256                         response = valerie_parser_run( server->parser, server->config );
 257
 258                         if ( valerie_response_count( response ) > 1 )
 259                         {
 260                                 if ( valerie_response_get_error_code( response ) > 299 )
 261                                         miracle_log( LOG_ERR, "Error evaluating server configuration. Processing stopped." );
 262                                 for ( index = 0; index < valerie_response_count( response ); index ++ )
 263                                         miracle_log( LOG_DEBUG, "%4d: %s", index, valerie_response_get_line( response, index ) );
 264                         }
 265                 }
 266
 267                 if ( response != NULL )
 268                 {
 269                         pthread_attr_t attr;
 270                         int result;
 271                         pthread_attr_init( &attr );
 272                         pthread_attr_setdetachstate( &attr, PTHREAD_CREATE_JOINABLE );
 273                         pthread_attr_setinheritsched( &attr, PTHREAD_EXPLICIT_SCHED );
 274                         pthread_attr_setschedpolicy( &attr, SCHED_FIFO );
 275                         pthread_attr_setscope( &attr, PTHREAD_SCOPE_SYSTEM );
 276                         valerie_response_close( response );
 277                         result = pthread_create( &server->thread, &attr, miracle_server_run, server );
 278                         if ( result )
 279                         {
 280                                 miracle_log( LOG_WARNING, "Failed to schedule realtime (%s)", strerror(errno) );
 281                                 pthread_attr_setschedpolicy( &attr, SCHED_OTHER );
 282                                 result = pthread_create( &server->thread, &attr, miracle_server_run, server );
 283                                 if ( result )
 284                                 {
 285                                         miracle_log( LOG_CRIT, "Failed to launch TCP listener thread" );
 286                                         error = -1;
 287                                 }
 288                         }
 289                 }
 290         }
 291         else
 292         {
 293                 miracle_log( LOG_ERR, "Error connecting to parser. Processing stopped." );
 294                 server->shutdown = 1;
 295                 error = -1;
 296         }
 297
 298         return error;
 299 }
 300
 301 /** Shutdown the server.
 302 */
 303
 304 void miracle_server_shutdown( miracle_server server )
 305 {
 306         if ( server != NULL && !server->shutdown )
 307         {
 308                 server->shutdown = 1;
 309                 pthread_join( server->thread, NULL );
 310                 miracle_server_set_config( server, NULL );
 311                 valerie_parser_close( server->parser );
 312                 server->parser = NULL;
 313                 close( server->socket );
 314         }
 315 }
 316
 317 /** Close the server.
 318 */
 319
 320 void miracle_server_close( miracle_server server )
 321 {
 322         if ( server != NULL && mlt_properties_dec_ref( &server->parent ) <= 0 )
 323         {
 324                 mlt_properties_close( &server->parent );
 325                 miracle_server_shutdown( server );
 326                 free( server );
 327         }
 328 }