src/core/plugin.c

   1 /*
   2  * SysDB - src/core/plugin.c
   3  * Copyright (C) 2012 Sebastian 'tokkee' Harl <sh@tokkee.org>
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  16  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  17  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  18  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR
  19  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  20  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  21  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
  22  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  23  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  24  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  25  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26  */
  27
  28 #include "sysdb.h"
  29 #include "core/plugin.h"
  30 #include "core/error.h"
  31 #include "core/time.h"
  32 #include "utils/llist.h"
  33
  34 #include <assert.h>
  35
  36 #include <errno.h>
  37
  38 #include <stdarg.h>
  39 #include <stdio.h>
  40 #include <string.h>
  41 #include <strings.h>
  42 #include <unistd.h>
  43
  44 #include <ltdl.h>
  45
  46 #include <pthread.h>
  47
  48 /*
  49  * private data types
  50  */
  51
  52 struct sdb_plugin_info {
  53         char *name;
  54
  55         char *description;
  56         char *copyright;
  57         char *license;
  58
  59         int   version;
  60         int   plugin_version;
  61 };
  62 #define SDB_PLUGIN_INFO_INIT { "no name set", "no description set", \
  63         /* copyright */ "", /* license */ "", \
  64         /* version */ -1, /* plugin_version */ -1 }
  65
  66 typedef struct {
  67         sdb_object_t super;
  68         char cb_name[64];
  69         void *cb_callback;
  70         sdb_object_t *cb_user_data;
  71         sdb_plugin_ctx_t cb_ctx;
  72 } sdb_plugin_cb_t;
  73 #define SDB_PLUGIN_CB_INIT { SDB_OBJECT_INIT, /* name = */ "", \
  74         /* callback = */ NULL, /* user_data = */ NULL, \
  75         SDB_PLUGIN_CTX_INIT }
  76
  77 typedef struct {
  78         sdb_plugin_cb_t super;
  79 #define ccb_name super.cb_name
  80 #define ccb_callback super.cb_callback
  81 #define ccb_user_data super.cb_user_data
  82 #define ccb_ctx super.cb_ctx
  83         sdb_time_t ccb_interval;
  84         sdb_time_t ccb_next_update;
  85 } sdb_plugin_collector_cb_t;
  86
  87 #define SDB_PLUGIN_CB(obj) ((sdb_plugin_cb_t *)(obj))
  88 #define SDB_PLUGIN_CCB(obj) ((sdb_plugin_collector_cb_t *)(obj))
  89
  90 /*
  91  * private variables
  92  */
  93
  94 static sdb_plugin_ctx_t  plugin_default_ctx = SDB_PLUGIN_CTX_INIT;
  95
  96 static pthread_key_t    plugin_ctx_key;
  97 static _Bool            plugin_ctx_key_initialized = 0;
  98
  99 static sdb_llist_t      *config_list = NULL;
 100 static sdb_llist_t      *init_list = NULL;
 101 static sdb_llist_t      *collector_list = NULL;
 102 static sdb_llist_t      *shutdown_list = NULL;
 103 static sdb_llist_t      *log_list = NULL;
 104
 105 /*
 106  * private helper functions
 107  */
 108
 109 static void
 110 sdb_plugin_ctx_destructor(void *ctx)
 111 {
 112         if (! ctx)
 113                 return;
 114         free(ctx);
 115 } /* sdb_plugin_ctx_destructor */
 116
 117 static void
 118 sdb_plugin_ctx_init(void)
 119 {
 120         if (plugin_ctx_key_initialized)
 121                 return;
 122
 123         pthread_key_create(&plugin_ctx_key, sdb_plugin_ctx_destructor);
 124         plugin_ctx_key_initialized = 1;
 125 } /* sdb_plugin_ctx_init */
 126
 127 static sdb_plugin_ctx_t *
 128 sdb_plugin_ctx_create(void)
 129 {
 130         sdb_plugin_ctx_t *ctx;
 131
 132         ctx = malloc(sizeof(*ctx));
 133         if (! ctx)
 134                 return NULL;
 135
 136         *ctx = plugin_default_ctx;
 137
 138         if (! plugin_ctx_key_initialized)
 139                 sdb_plugin_ctx_init();
 140         pthread_setspecific(plugin_ctx_key, ctx);
 141         return ctx;
 142 } /* sdb_plugin_ctx_create */
 143
 144 static int
 145 sdb_plugin_cmp_name(const sdb_object_t *a, const sdb_object_t *b)
 146 {
 147         const sdb_plugin_cb_t *cb1 = (const sdb_plugin_cb_t *)a;
 148         const sdb_plugin_cb_t *cb2 = (const sdb_plugin_cb_t *)b;
 149
 150         assert(cb1 && cb2);
 151         return strcasecmp(cb1->cb_name, cb2->cb_name);
 152 } /* sdb_plugin_cmp_name */
 153
 154 static int
 155 sdb_plugin_cmp_next_update(const sdb_object_t *a, const sdb_object_t *b)
 156 {
 157         const sdb_plugin_collector_cb_t *ccb1
 158                 = (const sdb_plugin_collector_cb_t *)a;
 159         const sdb_plugin_collector_cb_t *ccb2
 160                 = (const sdb_plugin_collector_cb_t *)b;
 161
 162         assert(ccb1 && ccb2);
 163
 164         return (ccb1->ccb_next_update > ccb2->ccb_next_update)
 165                 ? 1 : (ccb1->ccb_next_update < ccb2->ccb_next_update)
 166                 ? -1 : 0;
 167 } /* sdb_plugin_cmp_next_update */
 168
 169 static sdb_plugin_cb_t *
 170 sdb_plugin_find_by_name(sdb_llist_t *list, const char *name)
 171 {
 172         sdb_plugin_cb_t tmp = SDB_PLUGIN_CB_INIT;
 173
 174         sdb_object_t *obj;
 175         assert(name);
 176
 177         if (! list)
 178                 return NULL;
 179
 180         snprintf(tmp.cb_name, sizeof(tmp.cb_name), "%s", name);
 181         tmp.cb_name[sizeof(tmp.cb_name) - 1] = '\0';
 182         obj = sdb_llist_search(list, SDB_OBJ(&tmp), sdb_plugin_cmp_name);
 183         if (! obj)
 184                 return NULL;
 185         return SDB_PLUGIN_CB(obj);
 186 } /* sdb_plugin_find_by_name */
 187
 188 /*
 189  * private types
 190  */
 191
 192 static int
 193 sdb_plugin_cb_init(sdb_object_t *obj, va_list ap)
 194 {
 195         sdb_llist_t **list = va_arg(ap, sdb_llist_t **);
 196         const char  *type = va_arg(ap, const char *);
 197         const char  *name = va_arg(ap, const char *);
 198         void    *callback = va_arg(ap, void *);
 199         sdb_object_t   *ud = va_arg(ap, sdb_object_t *);
 200
 201         assert(list);
 202         assert(type);
 203         assert(obj);
 204
 205         if (sdb_plugin_find_by_name(*list, name)) {
 206                 sdb_log(SDB_LOG_WARNING, "plugin: %s callback '%s' "
 207                                 "has already been registered. Ignoring newly "
 208                                 "registered version.", type, name);
 209                 return -1;
 210         }
 211
 212         snprintf(SDB_PLUGIN_CB(obj)->cb_name,
 213                         sizeof(SDB_PLUGIN_CB(obj)->cb_name),
 214                         "%s", name);
 215         SDB_PLUGIN_CB(obj)->cb_name[sizeof(SDB_PLUGIN_CB(obj)->cb_name) - 1] = '\0';
 216         SDB_PLUGIN_CB(obj)->cb_callback = callback;
 217         SDB_PLUGIN_CB(obj)->cb_ctx      = sdb_plugin_get_ctx();
 218
 219         sdb_object_ref(ud);
 220         SDB_PLUGIN_CB(obj)->cb_user_data = ud;
 221         return 0;
 222 } /* sdb_plugin_cb_init */
 223
 224 static void
 225 sdb_plugin_cb_destroy(sdb_object_t *obj)
 226 {
 227         assert(obj);
 228         sdb_object_deref(SDB_PLUGIN_CB(obj)->cb_user_data);
 229 } /* sdb_plugin_cb_destroy */
 230
 231 static sdb_type_t sdb_plugin_cb_type = {
 232         sizeof(sdb_plugin_cb_t),
 233
 234         sdb_plugin_cb_init,
 235         sdb_plugin_cb_destroy,
 236         /* clone = */ NULL
 237 };
 238
 239 static sdb_type_t sdb_plugin_collector_cb_type = {
 240         sizeof(sdb_plugin_collector_cb_t),
 241
 242         sdb_plugin_cb_init,
 243         sdb_plugin_cb_destroy,
 244         /* clone = */ NULL
 245 };
 246
 247 static int
 248 sdb_plugin_add_callback(sdb_llist_t **list, const char *type,
 249                 const char *name, void *callback, sdb_object_t *user_data)
 250 {
 251         sdb_object_t *obj;
 252
 253         if ((! name) || (! callback))
 254                 return -1;
 255
 256         assert(list);
 257
 258         if (! *list)
 259                 *list = sdb_llist_create();
 260         if (! *list)
 261                 return -1;
 262
 263         obj = sdb_object_create(sdb_plugin_cb_type,
 264                         list, type, name, callback, user_data);
 265         if (! obj)
 266                 return -1;
 267
 268         if (sdb_llist_append(*list, obj)) {
 269                 sdb_object_deref(obj);
 270                 return -1;
 271         }
 272
 273         /* pass control to the list */
 274         sdb_object_deref(obj);
 275
 276         sdb_log(SDB_LOG_INFO, "plugin: Registered %s callback '%s'.",
 277                         type, name);
 278         return 0;
 279 } /* sdb_plugin_add_callback */
 280
 281 /*
 282  * public API
 283  */
 284
 285 int
 286 sdb_plugin_load(const char *name)
 287 {
 288         char  real_name[strlen(name) > 0 ? strlen(name) : 1];
 289         const char *name_ptr;
 290         char *tmp;
 291
 292         char filename[1024];
 293
 294         lt_dlhandle lh;
 295
 296         int (*mod_init)(sdb_plugin_info_t *);
 297         sdb_plugin_info_t plugin_info = SDB_PLUGIN_INFO_INIT;
 298
 299         int status;
 300
 301         if ((! name) || (! *name))
 302                 return -1;
 303
 304         real_name[0] = '\0';
 305         name_ptr = name;
 306
 307         while ((tmp = strstr(name_ptr, "::"))) {
 308                 strncat(real_name, name_ptr, (size_t)(tmp - name_ptr));
 309                 strcat(real_name, "/");
 310                 name_ptr = tmp + strlen("::");
 311         }
 312         strcat(real_name, name_ptr);
 313
 314         snprintf(filename, sizeof(filename), "%s/%s.so",
 315                         PKGLIBDIR, real_name);
 316         filename[sizeof(filename) - 1] = '\0';
 317
 318         if (access(filename, R_OK)) {
 319                 char errbuf[1024];
 320                 sdb_log(SDB_LOG_ERR, "plugin: Failed to load plugin '%s' (%s): %s",
 321                                 name, filename, sdb_strerror(errno, errbuf, sizeof(errbuf)));
 322                 return -1;
 323         }
 324
 325         lt_dlinit();
 326         lt_dlerror();
 327
 328         lh = lt_dlopen(filename);
 329         if (! lh) {
 330                 sdb_log(SDB_LOG_ERR, "plugin: Failed to load plugin '%s': %s"
 331                                 "The most common cause for this problem are missing "
 332                                 "dependencies.\n", name, lt_dlerror());
 333                 return -1;
 334         }
 335
 336         mod_init = (int (*)(sdb_plugin_info_t *))lt_dlsym(lh, "sdb_module_init");
 337         if (! mod_init) {
 338                 sdb_log(SDB_LOG_ERR, "plugin: Failed to load plugin '%s': "
 339                                 "could not find symbol 'sdb_module_init'", name);
 340                 return -1;
 341         }
 342
 343         status = mod_init(&plugin_info);
 344         if (status) {
 345                 sdb_log(SDB_LOG_ERR, "plugin: Failed to initialize "
 346                                 "plugin '%s'", name);
 347                 return -1;
 348         }
 349
 350         /* compare minor version */
 351         if ((plugin_info.version < 0)
 352                         || ((int)(plugin_info.version / 100) != (int)(SDB_VERSION / 100)))
 353                 sdb_log(SDB_LOG_WARNING, "plugin: WARNING: version of "
 354                                 "plugin '%s' (%i.%i.%i) does not match our version "
 355                                 "(%i.%i.%i); this might cause problems",
 356                                 name, SDB_VERSION_DECODE(plugin_info.version),
 357                                 SDB_VERSION_DECODE(SDB_VERSION));
 358
 359         sdb_log(SDB_LOG_INFO, "plugin: Successfully loaded "
 360                         "plugin '%s' v%i (%s)\n\t%s",
 361                         plugin_info.name, plugin_info.plugin_version,
 362                         plugin_info.description, plugin_info.copyright);
 363         return 0;
 364 } /* sdb_plugin_load */
 365
 366 int
 367 sdb_plugin_set_info(sdb_plugin_info_t *info, int type, ...)
 368 {
 369         va_list ap;
 370
 371         if (! info)
 372                 return -1;
 373
 374         va_start(ap, type);
 375
 376         switch (type) {
 377                 case SDB_PLUGIN_INFO_NAME:
 378                         {
 379                                 char *name = va_arg(ap, char *);
 380                                 info->name = name;
 381                         }
 382                         break;
 383                 case SDB_PLUGIN_INFO_DESC:
 384                         {
 385                                 char *desc = va_arg(ap, char *);
 386                                 info->description = desc;
 387                         }
 388                         break;
 389                 case SDB_PLUGIN_INFO_COPYRIGHT:
 390                         {
 391                                 char *copyright = va_arg(ap, char *);
 392                                 info->copyright = copyright;
 393                         }
 394                         break;
 395                 case SDB_PLUGIN_INFO_LICENSE:
 396                         {
 397                                 char *license = va_arg(ap, char *);
 398                                 info->license = license;
 399                         }
 400                         break;
 401                 case SDB_PLUGIN_INFO_VERSION:
 402                         {
 403                                 int version = va_arg(ap, int);
 404                                 info->version = version;
 405                         }
 406                         break;
 407                 case SDB_PLUGIN_INFO_PLUGIN_VERSION:
 408                         {
 409                                 int version = va_arg(ap, int);
 410                                 info->plugin_version = version;
 411                         }
 412                         break;
 413                 default:
 414                         va_end(ap);
 415                         return -1;
 416         }
 417
 418         va_end(ap);
 419         return 0;
 420 } /* sdb_plugin_set_info */
 421
 422 int
 423 sdb_plugin_register_config(const char *name, sdb_plugin_config_cb callback)
 424 {
 425         return sdb_plugin_add_callback(&config_list, "init", name,
 426                         callback, NULL);
 427 } /* sdb_plugin_register_config */
 428
 429 int
 430 sdb_plugin_register_init(const char *name, sdb_plugin_init_cb callback,
 431                 sdb_object_t *user_data)
 432 {
 433         return sdb_plugin_add_callback(&init_list, "init", name,
 434                         callback, user_data);
 435 } /* sdb_plugin_register_init */
 436
 437 int
 438 sdb_plugin_register_shutdown(const char *name, sdb_plugin_shutdown_cb callback,
 439                 sdb_object_t *user_data)
 440 {
 441         return sdb_plugin_add_callback(&shutdown_list, "shutdown", name,
 442                         callback, user_data);
 443 } /* sdb_plugin_register_shutdown */
 444
 445 int
 446 sdb_plugin_register_log(const char *name, sdb_plugin_log_cb callback,
 447                 sdb_object_t *user_data)
 448 {
 449         return sdb_plugin_add_callback(&log_list, "log", name, callback,
 450                         user_data);
 451 } /* sdb_plugin_register_log */
 452
 453 int
 454 sdb_plugin_register_collector(const char *name, sdb_plugin_collector_cb callback,
 455                 const sdb_time_t *interval, sdb_object_t *user_data)
 456 {
 457         sdb_object_t *obj;
 458
 459         if ((! name) || (! callback))
 460                 return -1;
 461
 462         if (! collector_list)
 463                 collector_list = sdb_llist_create();
 464         if (! collector_list)
 465                 return -1;
 466
 467         obj = sdb_object_create(sdb_plugin_collector_cb_type,
 468                         &collector_list, "collector", name, callback, user_data);
 469         if (! obj)
 470                 return -1;
 471
 472         if (interval)
 473                 SDB_PLUGIN_CCB(obj)->ccb_interval = *interval;
 474         else {
 475                 sdb_time_t tmp = sdb_plugin_get_ctx().interval;
 476
 477                 if (tmp > 0)
 478                         SDB_PLUGIN_CCB(obj)->ccb_interval = tmp;
 479                 else
 480                         SDB_PLUGIN_CCB(obj)->ccb_interval = 0;
 481         }
 482
 483         if (! (SDB_PLUGIN_CCB(obj)->ccb_next_update = sdb_gettime())) {
 484                 char errbuf[1024];
 485                 sdb_log(SDB_LOG_ERR, "plugin: Failed to determine current "
 486                                 "time: %s", sdb_strerror(errno, errbuf, sizeof(errbuf)));
 487                 sdb_object_deref(obj);
 488                 return -1;
 489         }
 490
 491         if (sdb_llist_insert_sorted(collector_list, obj,
 492                                 sdb_plugin_cmp_next_update)) {
 493                 sdb_object_deref(obj);
 494                 return -1;
 495         }
 496
 497         /* pass control to the list */
 498         sdb_object_deref(obj);
 499
 500         sdb_log(SDB_LOG_INFO, "plugin: Registered collector callback '%s' "
 501                         "(interval = %.3fs).", name,
 502                         SDB_TIME_TO_DOUBLE(SDB_PLUGIN_CCB(obj)->ccb_interval));
 503         return 0;
 504 } /* sdb_plugin_register_collector */
 505
 506 sdb_plugin_ctx_t
 507 sdb_plugin_get_ctx(void)
 508 {
 509         sdb_plugin_ctx_t *ctx;
 510
 511         if (! plugin_ctx_key_initialized)
 512                 sdb_plugin_ctx_init();
 513         ctx = pthread_getspecific(plugin_ctx_key);
 514
 515         if (! ctx)
 516                 ctx = sdb_plugin_ctx_create();
 517         if (! ctx)
 518                 return plugin_default_ctx;
 519         return *ctx;
 520 } /* sdb_plugin_get_ctx */
 521
 522 sdb_plugin_ctx_t
 523 sdb_plugin_set_ctx(sdb_plugin_ctx_t ctx)
 524 {
 525         sdb_plugin_ctx_t *tmp;
 526         sdb_plugin_ctx_t old;
 527
 528         if (! plugin_ctx_key_initialized)
 529                 sdb_plugin_ctx_init();
 530         tmp = pthread_getspecific(plugin_ctx_key);
 531
 532         if (! tmp)
 533                 tmp = sdb_plugin_ctx_create();
 534         if (! tmp)
 535                 return plugin_default_ctx;
 536
 537         old = *tmp;
 538         *tmp = ctx;
 539         return old;
 540 } /* sdb_plugin_set_ctx */
 541
 542 int
 543 sdb_plugin_configure(const char *name, oconfig_item_t *ci)
 544 {
 545         sdb_plugin_cb_t *plugin;
 546         sdb_plugin_config_cb callback;
 547
 548         sdb_plugin_ctx_t old_ctx;
 549
 550         int status;
 551
 552         if ((! name) || (! ci))
 553                 return -1;
 554
 555         plugin = sdb_plugin_find_by_name(config_list, name);
 556         if (! plugin) {
 557                 /* XXX: check if any such plugin has been loaded */
 558                 sdb_log(SDB_LOG_ERR, "plugin: Plugin '%s' did not register "
 559                                 "a config callback.", name);
 560                 errno = ENOENT;
 561                 return -1;
 562         }
 563
 564         old_ctx = sdb_plugin_set_ctx(plugin->cb_ctx);
 565         callback = plugin->cb_callback;
 566         status = callback(ci);
 567         sdb_plugin_set_ctx(old_ctx);
 568         return status;
 569 } /* sdb_plugin_configure */
 570
 571 int
 572 sdb_plugin_init_all(void)
 573 {
 574         sdb_llist_iter_t *iter;
 575
 576         iter = sdb_llist_get_iter(init_list);
 577         while (sdb_llist_iter_has_next(iter)) {
 578                 sdb_plugin_init_cb callback;
 579                 sdb_plugin_ctx_t old_ctx;
 580
 581                 sdb_object_t *obj = sdb_llist_iter_get_next(iter);
 582                 assert(obj);
 583
 584                 callback = SDB_PLUGIN_CB(obj)->cb_callback;
 585
 586                 old_ctx = sdb_plugin_set_ctx(SDB_PLUGIN_CB(obj)->cb_ctx);
 587                 if (callback(SDB_PLUGIN_CB(obj)->cb_user_data)) {
 588                         /* XXX: unload plugin */
 589                 }
 590                 sdb_plugin_set_ctx(old_ctx);
 591         }
 592         sdb_llist_iter_destroy(iter);
 593         return 0;
 594 } /* sdb_plugin_init_all */
 595
 596 int
 597 sdb_plugin_collector_loop(sdb_plugin_loop_t *loop)
 598 {
 599         if (! collector_list) {
 600                 sdb_log(SDB_LOG_WARNING, "plugin: No collectors registered. "
 601                                 "Quiting main loop.");
 602                 return -1;
 603         }
 604
 605         if (! loop)
 606                 return -1;
 607
 608         while (loop->do_loop) {
 609                 sdb_plugin_collector_cb callback;
 610                 sdb_plugin_ctx_t old_ctx;
 611
 612                 sdb_time_t interval, now;
 613
 614                 sdb_object_t *obj = sdb_llist_shift(collector_list);
 615                 if (! obj)
 616                         return -1;
 617
 618                 callback = SDB_PLUGIN_CCB(obj)->ccb_callback;
 619
 620                 if (! (now = sdb_gettime())) {
 621                         char errbuf[1024];
 622                         sdb_log(SDB_LOG_ERR, "plugin: Failed to determine current "
 623                                         "time: %s", sdb_strerror(errno, errbuf, sizeof(errbuf)));
 624                         now = SDB_PLUGIN_CCB(obj)->ccb_next_update;
 625                 }
 626
 627                 if (now < SDB_PLUGIN_CCB(obj)->ccb_next_update) {
 628                         interval = SDB_PLUGIN_CCB(obj)->ccb_next_update - now;
 629
 630                         errno = 0;
 631                         while (loop->do_loop && sdb_sleep(interval, &interval)) {
 632                                 if (errno != EINTR) {
 633                                         char errbuf[1024];
 634                                         sdb_log(SDB_LOG_ERR, "plugin: Failed to sleep: %s",
 635                                                         sdb_strerror(errno, errbuf, sizeof(errbuf)));
 636                                         return -1;
 637                                 }
 638                                 errno = 0;
 639                         }
 640
 641                         if (! loop->do_loop)
 642                                 return 0;
 643                 }
 644
 645                 old_ctx = sdb_plugin_set_ctx(SDB_PLUGIN_CCB(obj)->ccb_ctx);
 646                 if (callback(SDB_PLUGIN_CCB(obj)->ccb_user_data)) {
 647                         /* XXX */
 648                 }
 649                 sdb_plugin_set_ctx(old_ctx);
 650
 651                 interval = SDB_PLUGIN_CCB(obj)->ccb_interval;
 652                 if (! interval)
 653                         interval = loop->default_interval;
 654                 if (! interval) {
 655                         sdb_log(SDB_LOG_WARNING, "plugin: No interval configured "
 656                                         "for plugin '%s'; skipping any further "
 657                                         "iterations.", SDB_PLUGIN_CCB(obj)->ccb_name);
 658                         sdb_object_deref(obj);
 659                         continue;
 660                 }
 661
 662                 SDB_PLUGIN_CCB(obj)->ccb_next_update += interval;
 663
 664                 if (! (now = sdb_gettime())) {
 665                         char errbuf[1024];
 666                         sdb_log(SDB_LOG_ERR, "plugin: Failed to determine current "
 667                                         "time: %s", sdb_strerror(errno, errbuf, sizeof(errbuf)));
 668                         now = SDB_PLUGIN_CCB(obj)->ccb_next_update;
 669                 }
 670
 671                 if (now > SDB_PLUGIN_CCB(obj)->ccb_next_update) {
 672                         sdb_log(SDB_LOG_WARNING, "plugin: Plugin '%s' took too "
 673                                         "long; skipping iterations to keep up.",
 674                                         SDB_PLUGIN_CCB(obj)->ccb_name);
 675                         SDB_PLUGIN_CCB(obj)->ccb_next_update = now;
 676                 }
 677
 678                 if (sdb_llist_insert_sorted(collector_list, obj,
 679                                         sdb_plugin_cmp_next_update)) {
 680                         sdb_log(SDB_LOG_ERR, "plugin: Failed to re-insert "
 681                                         "plugin '%s' into collector list. Unable to further "
 682                                         "use the plugin.",
 683                                         SDB_PLUGIN_CCB(obj)->ccb_name);
 684                         sdb_object_deref(obj);
 685                         return -1;
 686                 }
 687
 688                 /* pass control back to the list */
 689                 sdb_object_deref(obj);
 690         }
 691         return 0;
 692 } /* sdb_plugin_read_loop */
 693
 694 int
 695 sdb_plugin_log(int prio, const char *msg)
 696 {
 697         sdb_llist_iter_t *iter;
 698         int ret = -1;
 699
 700         if (! log_list)
 701                 return fprintf(stderr, "[%s] %s\n", SDB_LOG_PRIO_TO_STRING(prio), msg);
 702
 703         iter = sdb_llist_get_iter(log_list);
 704         while (sdb_llist_iter_has_next(iter)) {
 705                 sdb_plugin_log_cb callback;
 706                 int tmp;
 707
 708                 sdb_object_t *obj = sdb_llist_iter_get_next(iter);
 709                 assert(obj);
 710
 711                 callback = SDB_PLUGIN_CB(obj)->cb_callback;
 712                 tmp = callback(prio, msg, SDB_PLUGIN_CB(obj)->cb_user_data);
 713                 if (tmp > ret)
 714                         ret = tmp;
 715         }
 716         sdb_llist_iter_destroy(iter);
 717         return ret;
 718 } /* sdb_plugin_log */
 719
 720 /* vim: set tw=78 sw=4 ts=4 noexpandtab : */
 721