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