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 #include "utils/strbuf.h"
  34
  35 #include <assert.h>
  36
  37 #include <errno.h>
  38
  39 #include <stdarg.h>
  40 #include <stdio.h>
  41 #include <string.h>
  42 #include <strings.h>
  43 #include <unistd.h>
  44
  45 #include <ltdl.h>
  46
  47 #include <pthread.h>
  48
  49 /*
  50  * private data types
  51  */
  52
  53 struct sdb_plugin_info {
  54         char *name;
  55
  56         char *description;
  57         char *copyright;
  58         char *license;
  59
  60         int   version;
  61         int   plugin_version;
  62 };
  63 #define SDB_PLUGIN_INFO_INIT { "no name set", "no description set", \
  64         /* copyright */ "", /* license */ "", \
  65         /* version */ -1, /* plugin_version */ -1 }
  66
  67 typedef struct {
  68         sdb_object_t super;
  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, \
  74         /* callback = */ NULL, /* user_data = */ NULL, \
  75         SDB_PLUGIN_CTX_INIT }
  76
  77 typedef struct {
  78         sdb_plugin_cb_t super;
  79 #define ccb_callback super.cb_callback
  80 #define ccb_user_data super.cb_user_data
  81 #define ccb_ctx super.cb_ctx
  82         sdb_time_t ccb_interval;
  83         sdb_time_t ccb_next_update;
  84 } sdb_plugin_collector_cb_t;
  85
  86 #define SDB_PLUGIN_CB(obj) ((sdb_plugin_cb_t *)(obj))
  87 #define SDB_PLUGIN_CCB(obj) ((sdb_plugin_collector_cb_t *)(obj))
  88
  89 /*
  90  * private variables
  91  */
  92
  93 static sdb_plugin_ctx_t  plugin_default_ctx = SDB_PLUGIN_CTX_INIT;
  94
  95 static pthread_key_t    plugin_ctx_key;
  96 static _Bool            plugin_ctx_key_initialized = 0;
  97
  98 static sdb_llist_t      *config_list = NULL;
  99 static sdb_llist_t      *init_list = NULL;
 100 static sdb_llist_t      *collector_list = NULL;
 101 static sdb_llist_t      *cname_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_next_update(const sdb_object_t *a, const sdb_object_t *b)
 146 {
 147         const sdb_plugin_collector_cb_t *ccb1
 148                 = (const sdb_plugin_collector_cb_t *)a;
 149         const sdb_plugin_collector_cb_t *ccb2
 150                 = (const sdb_plugin_collector_cb_t *)b;
 151
 152         assert(ccb1 && ccb2);
 153
 154         return (ccb1->ccb_next_update > ccb2->ccb_next_update)
 155                 ? 1 : (ccb1->ccb_next_update < ccb2->ccb_next_update)
 156                 ? -1 : 0;
 157 } /* sdb_plugin_cmp_next_update */
 158
 159 /*
 160  * private types
 161  */
 162
 163 static int
 164 sdb_plugin_cb_init(sdb_object_t *obj, va_list ap)
 165 {
 166         sdb_llist_t **list = va_arg(ap, sdb_llist_t **);
 167         const char   *type = va_arg(ap, const char *);
 168         void     *callback = va_arg(ap, void *);
 169         sdb_object_t   *ud = va_arg(ap, sdb_object_t *);
 170
 171         assert(list);
 172         assert(type);
 173         assert(obj);
 174
 175         if (sdb_llist_search_by_name(*list, obj->name)) {
 176                 sdb_log(SDB_LOG_WARNING, "plugin: %s callback '%s' "
 177                                 "has already been registered. Ignoring newly "
 178                                 "registered version.", type, obj->name);
 179                 return -1;
 180         }
 181
 182         SDB_PLUGIN_CB(obj)->cb_callback = callback;
 183         SDB_PLUGIN_CB(obj)->cb_ctx      = sdb_plugin_get_ctx();
 184
 185         sdb_object_ref(ud);
 186         SDB_PLUGIN_CB(obj)->cb_user_data = ud;
 187         return 0;
 188 } /* sdb_plugin_cb_init */
 189
 190 static void
 191 sdb_plugin_cb_destroy(sdb_object_t *obj)
 192 {
 193         assert(obj);
 194         sdb_object_deref(SDB_PLUGIN_CB(obj)->cb_user_data);
 195 } /* sdb_plugin_cb_destroy */
 196
 197 static sdb_type_t sdb_plugin_cb_type = {
 198         sizeof(sdb_plugin_cb_t),
 199
 200         sdb_plugin_cb_init,
 201         sdb_plugin_cb_destroy
 202 };
 203
 204 static sdb_type_t sdb_plugin_collector_cb_type = {
 205         sizeof(sdb_plugin_collector_cb_t),
 206
 207         sdb_plugin_cb_init,
 208         sdb_plugin_cb_destroy
 209 };
 210
 211 static int
 212 sdb_plugin_add_callback(sdb_llist_t **list, const char *type,
 213                 const char *name, void *callback, sdb_object_t *user_data)
 214 {
 215         sdb_object_t *obj;
 216
 217         if ((! name) || (! callback))
 218                 return -1;
 219
 220         assert(list);
 221
 222         if (! *list)
 223                 *list = sdb_llist_create();
 224         if (! *list)
 225                 return -1;
 226
 227         obj = sdb_object_create(name, sdb_plugin_cb_type,
 228                         list, type, callback, user_data);
 229         if (! obj)
 230                 return -1;
 231
 232         if (sdb_llist_append(*list, obj)) {
 233                 sdb_object_deref(obj);
 234                 return -1;
 235         }
 236
 237         /* pass control to the list */
 238         sdb_object_deref(obj);
 239
 240         sdb_log(SDB_LOG_INFO, "plugin: Registered %s callback '%s'.",
 241                         type, name);
 242         return 0;
 243 } /* sdb_plugin_add_callback */
 244
 245 /*
 246  * public API
 247  */
 248
 249 int
 250 sdb_plugin_load(const char *name)
 251 {
 252         char  real_name[strlen(name) > 0 ? strlen(name) : 1];
 253         const char *name_ptr;
 254         char *tmp;
 255
 256         char filename[1024];
 257
 258         lt_dlhandle lh;
 259
 260         int (*mod_init)(sdb_plugin_info_t *);
 261         sdb_plugin_info_t plugin_info = SDB_PLUGIN_INFO_INIT;
 262
 263         int status;
 264
 265         if ((! name) || (! *name))
 266                 return -1;
 267
 268         real_name[0] = '\0';
 269         name_ptr = name;
 270
 271         while ((tmp = strstr(name_ptr, "::"))) {
 272                 strncat(real_name, name_ptr, (size_t)(tmp - name_ptr));
 273                 strcat(real_name, "/");
 274                 name_ptr = tmp + strlen("::");
 275         }
 276         strcat(real_name, name_ptr);
 277
 278         snprintf(filename, sizeof(filename), "%s/%s.so",
 279                         PKGLIBDIR, real_name);
 280         filename[sizeof(filename) - 1] = '\0';
 281
 282         if (access(filename, R_OK)) {
 283                 char errbuf[1024];
 284                 sdb_log(SDB_LOG_ERR, "plugin: Failed to load plugin '%s' (%s): %s",
 285                                 name, filename, sdb_strerror(errno, errbuf, sizeof(errbuf)));
 286                 return -1;
 287         }
 288
 289         lt_dlinit();
 290         lt_dlerror();
 291
 292         lh = lt_dlopen(filename);
 293         if (! lh) {
 294                 sdb_log(SDB_LOG_ERR, "plugin: Failed to load plugin '%s': %s"
 295                                 "The most common cause for this problem are missing "
 296                                 "dependencies.\n", name, lt_dlerror());
 297                 return -1;
 298         }
 299
 300         mod_init = (int (*)(sdb_plugin_info_t *))lt_dlsym(lh, "sdb_module_init");
 301         if (! mod_init) {
 302                 sdb_log(SDB_LOG_ERR, "plugin: Failed to load plugin '%s': "
 303                                 "could not find symbol 'sdb_module_init'", name);
 304                 return -1;
 305         }
 306
 307         status = mod_init(&plugin_info);
 308         if (status) {
 309                 sdb_log(SDB_LOG_ERR, "plugin: Failed to initialize "
 310                                 "plugin '%s'", name);
 311                 return -1;
 312         }
 313
 314         /* compare minor version */
 315         if ((plugin_info.version < 0)
 316                         || ((int)(plugin_info.version / 100) != (int)(SDB_VERSION / 100)))
 317                 sdb_log(SDB_LOG_WARNING, "plugin: WARNING: version of "
 318                                 "plugin '%s' (%i.%i.%i) does not match our version "
 319                                 "(%i.%i.%i); this might cause problems",
 320                                 name, SDB_VERSION_DECODE(plugin_info.version),
 321                                 SDB_VERSION_DECODE(SDB_VERSION));
 322
 323         sdb_log(SDB_LOG_INFO, "plugin: Successfully loaded "
 324                         "plugin '%s' v%i (%s)\n\t%s",
 325                         plugin_info.name, plugin_info.plugin_version,
 326                         plugin_info.description, plugin_info.copyright);
 327         return 0;
 328 } /* sdb_plugin_load */
 329
 330 int
 331 sdb_plugin_set_info(sdb_plugin_info_t *info, int type, ...)
 332 {
 333         va_list ap;
 334
 335         if (! info)
 336                 return -1;
 337
 338         va_start(ap, type);
 339
 340         switch (type) {
 341                 case SDB_PLUGIN_INFO_NAME:
 342                         {
 343                                 char *name = va_arg(ap, char *);
 344                                 info->name = name;
 345                         }
 346                         break;
 347                 case SDB_PLUGIN_INFO_DESC:
 348                         {
 349                                 char *desc = va_arg(ap, char *);
 350                                 info->description = desc;
 351                         }
 352                         break;
 353                 case SDB_PLUGIN_INFO_COPYRIGHT:
 354                         {
 355                                 char *copyright = va_arg(ap, char *);
 356                                 info->copyright = copyright;
 357                         }
 358                         break;
 359                 case SDB_PLUGIN_INFO_LICENSE:
 360                         {
 361                                 char *license = va_arg(ap, char *);
 362                                 info->license = license;
 363                         }
 364                         break;
 365                 case SDB_PLUGIN_INFO_VERSION:
 366                         {
 367                                 int version = va_arg(ap, int);
 368                                 info->version = version;
 369                         }
 370                         break;
 371                 case SDB_PLUGIN_INFO_PLUGIN_VERSION:
 372                         {
 373                                 int version = va_arg(ap, int);
 374                                 info->plugin_version = version;
 375                         }
 376                         break;
 377                 default:
 378                         va_end(ap);
 379                         return -1;
 380         }
 381
 382         va_end(ap);
 383         return 0;
 384 } /* sdb_plugin_set_info */
 385
 386 int
 387 sdb_plugin_register_config(const char *name, sdb_plugin_config_cb callback)
 388 {
 389         return sdb_plugin_add_callback(&config_list, "init", name,
 390                         callback, NULL);
 391 } /* sdb_plugin_register_config */
 392
 393 int
 394 sdb_plugin_register_init(const char *name, sdb_plugin_init_cb callback,
 395                 sdb_object_t *user_data)
 396 {
 397         return sdb_plugin_add_callback(&init_list, "init", name,
 398                         callback, user_data);
 399 } /* sdb_plugin_register_init */
 400
 401 int
 402 sdb_plugin_register_shutdown(const char *name, sdb_plugin_shutdown_cb callback,
 403                 sdb_object_t *user_data)
 404 {
 405         return sdb_plugin_add_callback(&shutdown_list, "shutdown", name,
 406                         callback, user_data);
 407 } /* sdb_plugin_register_shutdown */
 408
 409 int
 410 sdb_plugin_register_log(const char *name, sdb_plugin_log_cb callback,
 411                 sdb_object_t *user_data)
 412 {
 413         return sdb_plugin_add_callback(&log_list, "log", name, callback,
 414                         user_data);
 415 } /* sdb_plugin_register_log */
 416
 417 int
 418 sdb_plugin_register_cname(const char *name, sdb_plugin_cname_cb callback,
 419                 sdb_object_t *user_data)
 420 {
 421         return sdb_plugin_add_callback(&cname_list, "cname", name, callback,
 422                         user_data);
 423 } /* sdb_plugin_register_cname */
 424
 425 int
 426 sdb_plugin_register_collector(const char *name, sdb_plugin_collector_cb callback,
 427                 const sdb_time_t *interval, sdb_object_t *user_data)
 428 {
 429         sdb_object_t *obj;
 430
 431         if ((! name) || (! callback))
 432                 return -1;
 433
 434         if (! collector_list)
 435                 collector_list = sdb_llist_create();
 436         if (! collector_list)
 437                 return -1;
 438
 439         obj = sdb_object_create(name, sdb_plugin_collector_cb_type,
 440                         &collector_list, "collector", callback, user_data);
 441         if (! obj)
 442                 return -1;
 443
 444         if (interval)
 445                 SDB_PLUGIN_CCB(obj)->ccb_interval = *interval;
 446         else {
 447                 sdb_time_t tmp = sdb_plugin_get_ctx().interval;
 448
 449                 if (tmp > 0)
 450                         SDB_PLUGIN_CCB(obj)->ccb_interval = tmp;
 451                 else
 452                         SDB_PLUGIN_CCB(obj)->ccb_interval = 0;
 453         }
 454
 455         if (! (SDB_PLUGIN_CCB(obj)->ccb_next_update = sdb_gettime())) {
 456                 char errbuf[1024];
 457                 sdb_log(SDB_LOG_ERR, "plugin: Failed to determine current "
 458                                 "time: %s", sdb_strerror(errno, errbuf, sizeof(errbuf)));
 459                 sdb_object_deref(obj);
 460                 return -1;
 461         }
 462
 463         if (sdb_llist_insert_sorted(collector_list, obj,
 464                                 sdb_plugin_cmp_next_update)) {
 465                 sdb_object_deref(obj);
 466                 return -1;
 467         }
 468
 469         /* pass control to the list */
 470         sdb_object_deref(obj);
 471
 472         sdb_log(SDB_LOG_INFO, "plugin: Registered collector callback '%s' "
 473                         "(interval = %.3fs).", name,
 474                         SDB_TIME_TO_DOUBLE(SDB_PLUGIN_CCB(obj)->ccb_interval));
 475         return 0;
 476 } /* sdb_plugin_register_collector */
 477
 478 sdb_plugin_ctx_t
 479 sdb_plugin_get_ctx(void)
 480 {
 481         sdb_plugin_ctx_t *ctx;
 482
 483         if (! plugin_ctx_key_initialized)
 484                 sdb_plugin_ctx_init();
 485         ctx = pthread_getspecific(plugin_ctx_key);
 486
 487         if (! ctx)
 488                 ctx = sdb_plugin_ctx_create();
 489         if (! ctx)
 490                 return plugin_default_ctx;
 491         return *ctx;
 492 } /* sdb_plugin_get_ctx */
 493
 494 sdb_plugin_ctx_t
 495 sdb_plugin_set_ctx(sdb_plugin_ctx_t ctx)
 496 {
 497         sdb_plugin_ctx_t *tmp;
 498         sdb_plugin_ctx_t old;
 499
 500         if (! plugin_ctx_key_initialized)
 501                 sdb_plugin_ctx_init();
 502         tmp = pthread_getspecific(plugin_ctx_key);
 503
 504         if (! tmp)
 505                 tmp = sdb_plugin_ctx_create();
 506         if (! tmp)
 507                 return plugin_default_ctx;
 508
 509         old = *tmp;
 510         *tmp = ctx;
 511         return old;
 512 } /* sdb_plugin_set_ctx */
 513
 514 int
 515 sdb_plugin_configure(const char *name, oconfig_item_t *ci)
 516 {
 517         sdb_plugin_cb_t *plugin;
 518         sdb_plugin_config_cb callback;
 519
 520         sdb_plugin_ctx_t old_ctx;
 521
 522         int status;
 523
 524         if ((! name) || (! ci))
 525                 return -1;
 526
 527         plugin = SDB_PLUGIN_CB(sdb_llist_search_by_name(config_list, name));
 528         if (! plugin) {
 529                 /* XXX: check if any such plugin has been loaded */
 530                 sdb_log(SDB_LOG_ERR, "plugin: Plugin '%s' did not register "
 531                                 "a config callback.", name);
 532                 errno = ENOENT;
 533                 return -1;
 534         }
 535
 536         old_ctx = sdb_plugin_set_ctx(plugin->cb_ctx);
 537         callback = plugin->cb_callback;
 538         status = callback(ci);
 539         sdb_plugin_set_ctx(old_ctx);
 540         return status;
 541 } /* sdb_plugin_configure */
 542
 543 int
 544 sdb_plugin_init_all(void)
 545 {
 546         sdb_llist_iter_t *iter;
 547
 548         iter = sdb_llist_get_iter(init_list);
 549         while (sdb_llist_iter_has_next(iter)) {
 550                 sdb_plugin_init_cb callback;
 551                 sdb_plugin_ctx_t old_ctx;
 552
 553                 sdb_object_t *obj = sdb_llist_iter_get_next(iter);
 554                 assert(obj);
 555
 556                 callback = SDB_PLUGIN_CB(obj)->cb_callback;
 557
 558                 old_ctx = sdb_plugin_set_ctx(SDB_PLUGIN_CB(obj)->cb_ctx);
 559                 if (callback(SDB_PLUGIN_CB(obj)->cb_user_data)) {
 560                         /* XXX: unload plugin */
 561                 }
 562                 sdb_plugin_set_ctx(old_ctx);
 563         }
 564         sdb_llist_iter_destroy(iter);
 565         return 0;
 566 } /* sdb_plugin_init_all */
 567
 568 int
 569 sdb_plugin_collector_loop(sdb_plugin_loop_t *loop)
 570 {
 571         if (! collector_list) {
 572                 sdb_log(SDB_LOG_WARNING, "plugin: No collectors registered. "
 573                                 "Quiting main loop.");
 574                 return -1;
 575         }
 576
 577         if (! loop)
 578                 return -1;
 579
 580         while (loop->do_loop) {
 581                 sdb_plugin_collector_cb callback;
 582                 sdb_plugin_ctx_t old_ctx;
 583
 584                 sdb_time_t interval, now;
 585
 586                 sdb_object_t *obj = sdb_llist_shift(collector_list);
 587                 if (! obj)
 588                         return -1;
 589
 590                 callback = SDB_PLUGIN_CCB(obj)->ccb_callback;
 591
 592                 if (! (now = sdb_gettime())) {
 593                         char errbuf[1024];
 594                         sdb_log(SDB_LOG_ERR, "plugin: Failed to determine current "
 595                                         "time: %s", sdb_strerror(errno, errbuf, sizeof(errbuf)));
 596                         now = SDB_PLUGIN_CCB(obj)->ccb_next_update;
 597                 }
 598
 599                 if (now < SDB_PLUGIN_CCB(obj)->ccb_next_update) {
 600                         interval = SDB_PLUGIN_CCB(obj)->ccb_next_update - now;
 601
 602                         errno = 0;
 603                         while (loop->do_loop && sdb_sleep(interval, &interval)) {
 604                                 if (errno != EINTR) {
 605                                         char errbuf[1024];
 606                                         sdb_log(SDB_LOG_ERR, "plugin: Failed to sleep: %s",
 607                                                         sdb_strerror(errno, errbuf, sizeof(errbuf)));
 608                                         return -1;
 609                                 }
 610                                 errno = 0;
 611                         }
 612
 613                         if (! loop->do_loop)
 614                                 return 0;
 615                 }
 616
 617                 old_ctx = sdb_plugin_set_ctx(SDB_PLUGIN_CCB(obj)->ccb_ctx);
 618                 if (callback(SDB_PLUGIN_CCB(obj)->ccb_user_data)) {
 619                         /* XXX */
 620                 }
 621                 sdb_plugin_set_ctx(old_ctx);
 622
 623                 interval = SDB_PLUGIN_CCB(obj)->ccb_interval;
 624                 if (! interval)
 625                         interval = loop->default_interval;
 626                 if (! interval) {
 627                         sdb_log(SDB_LOG_WARNING, "plugin: No interval configured "
 628                                         "for plugin '%s'; skipping any further "
 629                                         "iterations.", obj->name);
 630                         sdb_object_deref(obj);
 631                         continue;
 632                 }
 633
 634                 SDB_PLUGIN_CCB(obj)->ccb_next_update += interval;
 635
 636                 if (! (now = sdb_gettime())) {
 637                         char errbuf[1024];
 638                         sdb_log(SDB_LOG_ERR, "plugin: Failed to determine current "
 639                                         "time: %s", sdb_strerror(errno, errbuf, sizeof(errbuf)));
 640                         now = SDB_PLUGIN_CCB(obj)->ccb_next_update;
 641                 }
 642
 643                 if (now > SDB_PLUGIN_CCB(obj)->ccb_next_update) {
 644                         sdb_log(SDB_LOG_WARNING, "plugin: Plugin '%s' took too "
 645                                         "long; skipping iterations to keep up.",
 646                                         obj->name);
 647                         SDB_PLUGIN_CCB(obj)->ccb_next_update = now;
 648                 }
 649
 650                 if (sdb_llist_insert_sorted(collector_list, obj,
 651                                         sdb_plugin_cmp_next_update)) {
 652                         sdb_log(SDB_LOG_ERR, "plugin: Failed to re-insert "
 653                                         "plugin '%s' into collector list. Unable to further "
 654                                         "use the plugin.",
 655                                         obj->name);
 656                         sdb_object_deref(obj);
 657                         return -1;
 658                 }
 659
 660                 /* pass control back to the list */
 661                 sdb_object_deref(obj);
 662         }
 663         return 0;
 664 } /* sdb_plugin_read_loop */
 665
 666 char *
 667 sdb_plugin_cname(char *hostname)
 668 {
 669         sdb_llist_iter_t *iter;
 670
 671         if (! hostname)
 672                 return NULL;
 673
 674         if (! cname_list)
 675                 return hostname;
 676
 677         iter = sdb_llist_get_iter(cname_list);
 678         while (sdb_llist_iter_has_next(iter)) {
 679                 sdb_plugin_cname_cb callback;
 680                 char *cname;
 681
 682                 sdb_object_t *obj = sdb_llist_iter_get_next(iter);
 683                 assert(obj);
 684
 685                 callback = SDB_PLUGIN_CB(obj)->cb_callback;
 686                 cname = callback(hostname, SDB_PLUGIN_CB(obj)->cb_user_data);
 687                 if (cname) {
 688                         free(hostname);
 689                         hostname = cname;
 690                 }
 691                 /* else: don't change hostname */
 692         }
 693         sdb_llist_iter_destroy(iter);
 694         return hostname;
 695 } /* sdb_plugin_cname */
 696
 697 int
 698 sdb_plugin_log(int prio, const char *msg)
 699 {
 700         sdb_llist_iter_t *iter;
 701         int ret = -1;
 702
 703         if (! msg)
 704                 return 0;
 705
 706         if (! log_list)
 707                 return fprintf(stderr, "[%s] %s\n", SDB_LOG_PRIO_TO_STRING(prio), msg);
 708
 709         iter = sdb_llist_get_iter(log_list);
 710         while (sdb_llist_iter_has_next(iter)) {
 711                 sdb_plugin_log_cb callback;
 712                 int tmp;
 713
 714                 sdb_object_t *obj = sdb_llist_iter_get_next(iter);
 715                 assert(obj);
 716
 717                 callback = SDB_PLUGIN_CB(obj)->cb_callback;
 718                 tmp = callback(prio, msg, SDB_PLUGIN_CB(obj)->cb_user_data);
 719                 if (tmp > ret)
 720                         ret = tmp;
 721         }
 722         sdb_llist_iter_destroy(iter);
 723         return ret;
 724 } /* sdb_plugin_log */
 725
 726 int
 727 sdb_plugin_vlogf(int prio, const char *fmt, va_list ap)
 728 {
 729         sdb_strbuf_t *buf;
 730         int ret;
 731
 732         if (! fmt)
 733                 return 0;
 734
 735         buf = sdb_strbuf_create(64);
 736         if (! buf) {
 737                 ret = fprintf(stderr, "[%s] ", SDB_LOG_PRIO_TO_STRING(prio));
 738                 ret += vfprintf(stderr, fmt, ap);
 739                 return ret;
 740         }
 741
 742         if (sdb_strbuf_vsprintf(buf, fmt, ap) < 0) {
 743                 sdb_strbuf_destroy(buf);
 744                 return -1;
 745         }
 746
 747         ret = sdb_plugin_log(prio, sdb_strbuf_string(buf));
 748         sdb_strbuf_destroy(buf);
 749         return ret;
 750 } /* sdb_plugin_vlogf */
 751
 752 int
 753 sdb_plugin_logf(int prio, const char *fmt, ...)
 754 {
 755         va_list ap;
 756         int ret;
 757
 758         if (! fmt)
 759                 return 0;
 760
 761         va_start(ap, fmt);
 762         ret = sdb_plugin_vlogf(prio, fmt, ap);
 763         va_end(ap);
 764         return ret;
 765 } /* sdb_plugin_logf */
 766
 767 /* vim: set tw=78 sw=4 ts=4 noexpandtab : */
 768