src/libopensrf/osrf_system.c

   1 #include <opensrf/osrf_system.h>
   2 #include <opensrf/osrf_application.h>
   3 #include <opensrf/osrf_prefork.h>
   4 #include <signal.h>
   5
   6 static int _osrfSystemInitCache( void );
   7 static void report_child_status( pid_t pid, int status );
   8 struct child_node;
   9 typedef struct child_node ChildNode;
  10
  11 struct child_node
  12 {
  13         ChildNode* pNext;
  14         ChildNode* pPrev;
  15         pid_t pid;
  16         char* app;
  17         char* libfile;
  18 };
  19
  20 static ChildNode* child_list;
  21
  22 static transport_client* osrfGlobalTransportClient = NULL;
  23
  24 static void add_child( pid_t pid, const char* app, const char* libfile );
  25 static void delete_child( ChildNode* node );
  26 static void delete_all_children( void );
  27 static ChildNode* seek_child( pid_t pid );
  28
  29 transport_client* osrfSystemGetTransportClient( void ) {
  30         return osrfGlobalTransportClient;
  31 }
  32
  33 void osrfSystemIgnoreTransportClient() {
  34         osrfGlobalTransportClient = NULL;
  35 }
  36
  37 int osrf_system_bootstrap_client( char* config_file, char* contextnode ) {
  38         return osrfSystemBootstrapClientResc(config_file, contextnode, NULL);
  39 }
  40
  41 static int _osrfSystemInitCache( void ) {
  42
  43         jsonObject* cacheServers = osrf_settings_host_value_object("/cache/global/servers/server");
  44         char* maxCache = osrf_settings_host_value("/cache/global/max_cache_time");
  45
  46         if( cacheServers && maxCache) {
  47
  48                 if( cacheServers->type == JSON_ARRAY ) {
  49                         int i;
  50                         const char* servers[cacheServers->size];
  51                         for( i = 0; i != cacheServers->size; i++ ) {
  52                                 servers[i] = jsonObjectGetString( jsonObjectGetIndex(cacheServers, i) );
  53                                 osrfLogInfo( OSRF_LOG_MARK, "Adding cache server %s", servers[i]);
  54                         }
  55                         osrfCacheInit( servers, cacheServers->size, atoi(maxCache) );
  56
  57                 } else {
  58                         const char* servers[] = { jsonObjectGetString(cacheServers) };
  59                         osrfLogInfo( OSRF_LOG_MARK, "Adding cache server %s", servers[0]);
  60                         osrfCacheInit( servers, 1, atoi(maxCache) );
  61                 }
  62
  63         } else {
  64                 osrfLogError( OSRF_LOG_MARK,  "Missing config value for /cache/global/servers/server _or_ "
  65                         "/cache/global/max_cache_time");
  66         }
  67
  68         return 0;
  69 }
  70
  71
  72 int osrfSystemBootstrap( char* hostname, char* configfile, char* contextNode ) {
  73         if( !(hostname && configfile && contextNode) ) return -1;
  74
  75         /* first we grab the settings */
  76         if(!osrfSystemBootstrapClientResc(configfile, contextNode, "settings_grabber" )) {
  77                 osrfLogError( OSRF_LOG_MARK,
  78                         "Unable to bootstrap for host %s from configuration file %s",
  79                         hostname, configfile );
  80                 return -1;
  81         }
  82
  83         int retcode = osrf_settings_retrieve(hostname);
  84         osrf_system_disconnect_client();
  85
  86         if( retcode ) {
  87                 osrfLogError( OSRF_LOG_MARK,
  88                         "Unable to retrieve settings for host %s from configuration file %s",
  89                         hostname, configfile );
  90                 return -1;
  91         }
  92
  93         /** daemonize me **/
  94         /* background and let our children do their thing */
  95         /* NOTE: This has been moved from below the 'if (apps)' block below ... move it back if things go crazy */
  96         daemonize();
  97
  98         jsonObject* apps = osrf_settings_host_value_object("/activeapps/appname");
  99         osrfStringArray* arr = osrfNewStringArray(8);
 100
 101         _osrfSystemInitCache();
 102
 103         if(apps) {
 104                 int i = 0;
 105
 106                 if(apps->type == JSON_STRING) {
 107                         osrfStringArrayAdd(arr, jsonObjectGetString(apps));
 108
 109                 } else {
 110                         const jsonObject* app;
 111                         while( (app = jsonObjectGetIndex(apps, i++)) )
 112                                 osrfStringArrayAdd(arr, jsonObjectGetString(app));
 113                 }
 114
 115                 char* appname = NULL;
 116                 i = 0;
 117                 while( (appname = osrfStringArrayGetString(arr, i++)) ) {
 118
 119                         char* lang = osrf_settings_host_value("/apps/%s/language", appname);
 120
 121                         if(lang && !strcasecmp(lang,"c"))  {
 122
 123                                 char* libfile = osrf_settings_host_value("/apps/%s/implementation", appname);
 124
 125                                 if(! (appname && libfile) ) {
 126                                         osrfLogWarning( OSRF_LOG_MARK, "Missing appname / libfile in settings config");
 127                                         continue;
 128                                 }
 129
 130                                 osrfLogInfo( OSRF_LOG_MARK, "Launching application %s with implementation %s", appname, libfile);
 131
 132                                 pid_t pid;
 133
 134                                 if( (pid = fork()) ) {
 135                                         // store pid in local list for re-launching dead children...
 136                                         add_child( pid, appname, libfile );
 137                                         osrfLogInfo( OSRF_LOG_MARK, "Running application child %s: process id %ld",
 138                                                                  appname, (long) pid );
 139
 140                                 } else {
 141
 142                                         osrfLogInfo( OSRF_LOG_MARK, " * Running application %s\n", appname);
 143                                         if( osrfAppRegisterApplication( appname, libfile ) == 0 )
 144                                                 osrf_prefork_run(appname);
 145
 146                                         osrfLogDebug( OSRF_LOG_MARK, "Server exiting for app %s and library %s\n", appname, libfile );
 147                                         exit(0);
 148                                 }
 149                         } // language == c
 150                 }
 151         } // should we do something if there are no apps? does the wait(NULL) below do that for us?
 152
 153         osrfStringArrayFree(arr);
 154
 155         while(1) {
 156                 errno = 0;
 157                 int status;
 158                 pid_t pid = wait( &status );
 159                 if(-1 == pid) {
 160                         if(errno == ECHILD)
 161                                 osrfLogError(OSRF_LOG_MARK, "We have no more live services... exiting");
 162                         else
 163                                 osrfLogError(OSRF_LOG_MARK, "Exiting top-level system loop with error: %s", strerror(errno));
 164                         break;
 165                 } else {
 166                         report_child_status( pid, status );
 167                 }
 168         }
 169
 170         delete_all_children();
 171         return 0;
 172 }
 173
 174
 175 static void report_child_status( pid_t pid, int status )
 176 {
 177         const char* app;
 178         const char* libfile;
 179         ChildNode* node = seek_child( pid );
 180
 181         if( node ) {
 182                 app     = node->app     ? node->app     : "[unknown]";
 183                 libfile = node->libfile ? node->libfile : "[none]";
 184         } else
 185                 app = libfile = NULL;
 186
 187         if( WIFEXITED( status ) )
 188         {
 189                 int rc = WEXITSTATUS( status );  // return code of child process
 190                 if( rc )
 191                         osrfLogError( OSRF_LOG_MARK, "Child process %ld (app %s) exited with return code %d",
 192                                                   (long) pid, app, rc );
 193                 else
 194                         osrfLogInfo( OSRF_LOG_MARK, "Child process %ld (app %s) exited normally",
 195                                                   (long) pid, app );
 196         }
 197         else if( WIFSIGNALED( status ) )
 198         {
 199                 osrfLogError( OSRF_LOG_MARK, "Child process %ld (app %s) killed by signal %d",
 200                                           (long) pid, app, WTERMSIG( status) );
 201         }
 202         else if( WIFSTOPPED( status ) )
 203         {
 204                 osrfLogError( OSRF_LOG_MARK, "Child process %ld (app %s) stopped by signal %d",
 205                                           (long) pid, app, (int) WSTOPSIG( status ) );
 206         }
 207
 208         delete_child( node );
 209 }
 210
 211 /*----------- Routines to manage list of children --*/
 212
 213 static void add_child( pid_t pid, const char* app, const char* libfile )
 214 {
 215         /* Construct new child node */
 216
 217         ChildNode* node = safe_malloc( sizeof( ChildNode ) );
 218
 219         node->pid = pid;
 220
 221         if( app )
 222                 node->app = strdup( app );
 223         else
 224                 node->app = NULL;
 225
 226         if( libfile )
 227                 node->libfile = strdup( libfile );
 228         else
 229                 node->libfile = NULL;
 230
 231         /* Add new child node to the head of the list */
 232
 233         node->pNext = child_list;
 234         node->pPrev = NULL;
 235
 236         if( child_list )
 237                 child_list->pPrev = node;
 238
 239         child_list = node;
 240 }
 241
 242 static void delete_child( ChildNode* node ) {
 243
 244         /* Sanity check */
 245
 246         if( ! node )
 247                 return;
 248
 249         /* Detach the node from the list */
 250
 251         if( node->pPrev )
 252                 node->pPrev->pNext = node->pNext;
 253         else
 254                 child_list = node->pNext;
 255
 256         if( node->pNext )
 257                 node->pNext->pPrev = node->pPrev;
 258
 259         /* Deallocate the node and its payload */
 260
 261         free( node->app );
 262         free( node->libfile );
 263         free( node );
 264 }
 265
 266 static void delete_all_children( void ) {
 267
 268         while( child_list )
 269                 delete_child( child_list );
 270 }
 271
 272 static ChildNode* seek_child( pid_t pid ) {
 273
 274         /* Return a pointer to the child node for the */
 275         /* specified process ID, or NULL if not found */
 276
 277         ChildNode* node = child_list;
 278         while( node ) {
 279                 if( node->pid == pid )
 280                         break;
 281                 else
 282                         node = node->pNext;
 283         }
 284
 285         return node;
 286 }
 287
 288 /*----------- End of routines to manage list of children --*/
 289
 290
 291 int osrfSystemBootstrapClientResc( char* config_file, char* contextnode, char* resource ) {
 292
 293         int failure = 0;
 294
 295         if(osrfSystemGetTransportClient()) {
 296                 osrfLogInfo(OSRF_LOG_MARK, "Client is already bootstrapped");
 297                 return 1; /* we already have a client connection */
 298         }
 299
 300         if( !( config_file && contextnode ) && ! osrfConfigHasDefaultConfig() ) {
 301                 osrfLogError( OSRF_LOG_MARK, "No Config File Specified\n" );
 302                 return -1;
 303         }
 304
 305         if( config_file ) {
 306                 osrfConfig* cfg = osrfConfigInit( config_file, contextnode );
 307                 if(cfg)
 308                         osrfConfigSetDefaultConfig(cfg);
 309                 else
 310                         return 0;   /* Can't load configuration?  Bail out */
 311         }
 312
 313
 314         char* log_file          = osrfConfigGetValue( NULL, "/logfile");
 315         if(!log_file) {
 316                 fprintf(stderr, "No log file specified in configuration file %s\n",
 317                                 config_file);
 318                 return -1;
 319         }
 320
 321         char* log_level         = osrfConfigGetValue( NULL, "/loglevel" );
 322         osrfStringArray* arr    = osrfNewStringArray(8);
 323         osrfConfigGetValueList(NULL, arr, "/domains/domain");
 324
 325         char* username          = osrfConfigGetValue( NULL, "/username" );
 326         char* password          = osrfConfigGetValue( NULL, "/passwd" );
 327         char* port              = osrfConfigGetValue( NULL, "/port" );
 328         char* unixpath          = osrfConfigGetValue( NULL, "/unixpath" );
 329         char* facility          = osrfConfigGetValue( NULL, "/syslog" );
 330         char* actlog            = osrfConfigGetValue( NULL, "/actlog" );
 331
 332         /* if we're a source-client, tell the logger */
 333         char* isclient = osrfConfigGetValue(NULL, "/client");
 334         if( isclient && !strcasecmp(isclient,"true") )
 335                 osrfLogSetIsClient(1);
 336         free(isclient);
 337
 338         int llevel = 0;
 339         int iport = 0;
 340         if(port) iport = atoi(port);
 341         if(log_level) llevel = atoi(log_level);
 342
 343         if(!strcmp(log_file, "syslog")) {
 344                 osrfLogInit( OSRF_LOG_TYPE_SYSLOG, contextnode, llevel );
 345                 osrfLogSetSyslogFacility(osrfLogFacilityToInt(facility));
 346                 if(actlog) osrfLogSetSyslogActFacility(osrfLogFacilityToInt(actlog));
 347
 348         } else {
 349                 osrfLogInit( OSRF_LOG_TYPE_FILE, contextnode, llevel );
 350                 osrfLogSetFile( log_file );
 351         }
 352
 353
 354         /* Get a domain, if one is specified */
 355         const char* domain = osrfStringArrayGetString( arr, 0 ); /* just the first for now */
 356         if(!domain) {
 357                 fprintf(stderr, "No domain specified in configuration file %s\n", config_file);
 358                 osrfLogError( OSRF_LOG_MARK, "No domain specified in configuration file %s\n", config_file);
 359                 failure = 1;
 360         }
 361
 362         if(!username) {
 363                 fprintf(stderr, "No username specified in configuration file %s\n", config_file);
 364                 osrfLogError( OSRF_LOG_MARK, "No username specified in configuration file %s\n", config_file);
 365                 failure = 1;
 366         }
 367
 368         if(!password) {
 369                 fprintf(stderr, "No password specified in configuration file %s\n", config_file);
 370                 osrfLogError( OSRF_LOG_MARK, "No password specified in configuration file %s\n", config_file);
 371                 failure = 1;
 372         }
 373
 374         if((iport <= 0) && !unixpath) {
 375                 fprintf(stderr, "No unixpath or valid port in configuration file %s\n", config_file);
 376                 osrfLogError( OSRF_LOG_MARK, "No unixpath or valid port in configuration file %s\n",
 377                         config_file);
 378                 failure = 1;
 379         }
 380
 381         if (failure) {
 382                 osrfStringArrayFree(arr);
 383                 free(log_level);
 384                 free(username);
 385                 free(password);
 386                 free(port);
 387                 free(unixpath);
 388                 free(facility);
 389                 free(actlog);
 390                 return 0;
 391         }
 392
 393         osrfLogInfo( OSRF_LOG_MARK, "Bootstrapping system with domain %s, port %d, and unixpath %s",
 394                 domain, iport, unixpath ? unixpath : "(none)" );
 395         transport_client* client = client_init( domain, iport, unixpath, 0 );
 396
 397         const char* host;
 398         host = getenv("HOSTNAME");
 399
 400         char tbuf[32];
 401         tbuf[0] = '\0';
 402         snprintf(tbuf, 32, "%f", get_timestamp_millis());
 403
 404         if(!host) host = "";
 405         if(!resource) resource = "";
 406
 407         int len = strlen(resource) + 256;
 408         char buf[len];
 409         buf[0] = '\0';
 410         snprintf(buf, len - 1, "%s_%s_%s_%ld", resource, host, tbuf, (long) getpid() );
 411
 412         if(client_connect( client, username, password, buf, 10, AUTH_DIGEST )) {
 413                 /* child nodes will leak the parents client... but we can't free
 414                         it without disconnecting the parents client :( */
 415                 osrfGlobalTransportClient = client;
 416         }
 417
 418         osrfStringArrayFree(arr);
 419         free(actlog);
 420         free(facility);
 421         free(log_level);
 422         free(log_file);
 423         free(username);
 424         free(password);
 425         free(port);
 426         free(unixpath);
 427
 428         if(osrfGlobalTransportClient)
 429                 return 1;
 430
 431         return 0;
 432 }
 433
 434 int osrf_system_disconnect_client( void ) {
 435         client_disconnect( osrfGlobalTransportClient );
 436         client_free( osrfGlobalTransportClient );
 437         osrfGlobalTransportClient = NULL;
 438         return 0;
 439 }
 440
 441 int osrf_system_shutdown( void ) {
 442         osrfConfigCleanup();
 443     osrfCacheCleanup();
 444         osrf_system_disconnect_client();
 445         osrf_settings_free_host_config(NULL);
 446         osrfAppSessionCleanup();
 447         osrfLogCleanup();
 448         return 1;
 449 }
 450
 451
 452
 453