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         /* clone = */ NULL
 203 };
 204
 205 static sdb_type_t sdb_plugin_collector_cb_type = {
 206         sizeof(sdb_plugin_collector_cb_t),
 207
 208         sdb_plugin_cb_init,
 209         sdb_plugin_cb_destroy,
 210         /* clone = */ NULL
 211 };
 212
 213 static int
 214 sdb_plugin_add_callback(sdb_llist_t **list, const char *type,
 215                 const char *name, void *callback, sdb_object_t *user_data)
 216 {
 217         sdb_object_t *obj;
 218
 219         if ((! name) || (! callback))
 220                 return -1;
 221
 222         assert(list);
 223
 224         if (! *list)
 225                 *list = sdb_llist_create();
 226         if (! *list)
 227                 return -1;
 228
 229         obj = sdb_object_create(name, sdb_plugin_cb_type,
 230                         list, type, callback, user_data);
 231         if (! obj)
 232                 return -1;
 233
 234         if (sdb_llist_append(*list, obj)) {
 235                 sdb_object_deref(obj);
 236                 return -1;
 237         }
 238
 239         /* pass control to the list */
 240         sdb_object_deref(obj);
 241
 242         sdb_log(SDB_LOG_INFO, "plugin: Registered %s callback '%s'.",
 243                         type, name);
 244         return 0;
 245 } /* sdb_plugin_add_callback */
 246
 247 /*
 248  * public API
 249  */
 250
 251 int
 252 sdb_plugin_load(const char *name)
 253 {
 254         char  real_name[strlen(name) > 0 ? strlen(name) : 1];
 255         const char *name_ptr;
 256         char *tmp;
 257
 258         char filename[1024];
 259
 260         lt_dlhandle lh;
 261
 262         int (*mod_init)(sdb_plugin_info_t *);
 263         sdb_plugin_info_t plugin_info = SDB_PLUGIN_INFO_INIT;
 264
 265         int status;
 266
 267         if ((! name) || (! *name))
 268                 return -1;
 269
 270         real_name[0] = '\0';
 271         name_ptr = name;
 272
 273         while ((tmp = strstr(name_ptr, "::"))) {
 274                 strncat(real_name, name_ptr, (size_t)(tmp - name_ptr));
 275                 strcat(real_name, "/");
 276                 name_ptr = tmp + strlen("::");
 277         }
 278         strcat(real_name, name_ptr);
 279
 280         snprintf(filename, sizeof(filename), "%s/%s.so",
 281                         PKGLIBDIR, real_name);
 282         filename[sizeof(filename) - 1] = '\0';
 283
 284         if (access(filename, R_OK)) {
 285                 char errbuf[1024];
 286                 sdb_log(SDB_LOG_ERR, "plugin: Failed to load plugin '%s' (%s): %s",
 287                                 name, filename, sdb_strerror(errno, errbuf, sizeof(errbuf)));
 288                 return -1;
 289         }
 290
 291         lt_dlinit();
 292         lt_dlerror();
 293
 294         lh = lt_dlopen(filename);
 295         if (! lh) {
 296                 sdb_log(SDB_LOG_ERR, "plugin: Failed to load plugin '%s': %s"
 297                                 "The most common cause for this problem are missing "
 298                                 "dependencies.\n", name, lt_dlerror());
 299                 return -1;
 300         }
 301
 302         mod_init = (int (*)(sdb_plugin_info_t *))lt_dlsym(lh, "sdb_module_init");
 303         if (! mod_init) {
 304                 sdb_log(SDB_LOG_ERR, "plugin: Failed to load plugin '%s': "
 305                                 "could not find symbol 'sdb_module_init'", name);
 306                 return -1;
 307         }
 308
 309         status = mod_init(&plugin_info);
 310         if (status) {
 311                 sdb_log(SDB_LOG_ERR, "plugin: Failed to initialize "
 312                                 "plugin '%s'", name);
 313                 return -1;
 314         }
 315
 316         /* compare minor version */
 317         if ((plugin_info.version < 0)
 318                         || ((int)(plugin_info.version / 100) != (int)(SDB_VERSION / 100)))
 319                 sdb_log(SDB_LOG_WARNING, "plugin: WARNING: version of "
 320                                 "plugin '%s' (%i.%i.%i) does not match our version "
 321                                 "(%i.%i.%i); this might cause problems",
 322                                 name, SDB_VERSION_DECODE(plugin_info.version),
 323                                 SDB_VERSION_DECODE(SDB_VERSION));
 324
 325         sdb_log(SDB_LOG_INFO, "plugin: Successfully loaded "
 326                         "plugin '%s' v%i (%s)\n\t%s",
 327                         plugin_info.name, plugin_info.plugin_version,
 328                         plugin_info.description, plugin_info.copyright);
 329         return 0;
 330 } /* sdb_plugin_load */
 331
 332 int
 333 sdb_plugin_set_info(sdb_plugin_info_t *info, int type, ...)
 334 {
 335         va_list ap;
 336
 337         if (! info)
 338                 return -1;
 339
 340         va_start(ap, type);
 341
 342         switch (type) {
 343                 case SDB_PLUGIN_INFO_NAME:
 344                         {
 345                                 char *name = va_arg(ap, char *);
 346                                 info->name = name;
 347                         }
 348                         break;
 349                 case SDB_PLUGIN_INFO_DESC:
 350                         {
 351                                 char *desc = va_arg(ap, char *);
 352                                 info->description = desc;
 353                         }
 354                         break;
 355                 case SDB_PLUGIN_INFO_COPYRIGHT:
 356                         {
 357                                 char *copyright = va_arg(ap, char *);
 358                                 info->copyright = copyright;
 359                         }
 360                         break;
 361                 case SDB_PLUGIN_INFO_LICENSE:
 362                         {
 363                                 char *license = va_arg(ap, char *);
 364                                 info->license = license;
 365                         }
 366                         break;
 367                 case SDB_PLUGIN_INFO_VERSION:
 368                         {
 369                                 int version = va_arg(ap, int);
 370                                 info->version = version;
 371                         }
 372                         break;
 373                 case SDB_PLUGIN_INFO_PLUGIN_VERSION:
 374                         {
 375                                 int version = va_arg(ap, int);
 376                                 info->plugin_version = version;
 377                         }
 378                         break;
 379                 default:
 380                         va_end(ap);
 381                         return -1;
 382         }
 383
 384         va_end(ap);
 385         return 0;
 386 } /* sdb_plugin_set_info */
 387
 388 int
 389 sdb_plugin_register_config(const char *name, sdb_plugin_config_cb callback)
 390 {
 391         return sdb_plugin_add_callback(&config_list, "init", name,
 392                         callback, NULL);
 393 } /* sdb_plugin_register_config */
 394
 395 int
 396 sdb_plugin_register_init(const char *name, sdb_plugin_init_cb callback,
 397                 sdb_object_t *user_data)
 398 {
 399         return sdb_plugin_add_callback(&init_list, "init", name,
 400                         callback, user_data);
 401 } /* sdb_plugin_register_init */
 402
 403 int
 404 sdb_plugin_register_shutdown(const char *name, sdb_plugin_shutdown_cb callback,
 405                 sdb_object_t *user_data)
 406 {
 407         return sdb_plugin_add_callback(&shutdown_list, "shutdown", name,
 408                         callback, user_data);
 409 } /* sdb_plugin_register_shutdown */
 410
 411 int
 412 sdb_plugin_register_log(const char *name, sdb_plugin_log_cb callback,
 413                 sdb_object_t *user_data)
 414 {
 415         return sdb_plugin_add_callback(&log_list, "log", name, callback,
 416                         user_data);
 417 } /* sdb_plugin_register_log */
 418
 419 int
 420 sdb_plugin_register_cname(const char *name, sdb_plugin_cname_cb callback,
 421                 sdb_object_t *user_data)
 422 {
 423         return sdb_plugin_add_callback(&cname_list, "cname", name, callback,
 424                         user_data);
 425 } /* sdb_plugin_register_cname */
 426
 427 int
 428 sdb_plugin_register_collector(const char *name, sdb_plugin_collector_cb callback,
 429                 const sdb_time_t *interval, sdb_object_t *user_data)
 430 {
 431         sdb_object_t *obj;
 432
 433         if ((! name) || (! callback))
 434                 return -1;
 435
 436         if (! collector_list)
 437                 collector_list = sdb_llist_create();
 438         if (! collector_list)
 439                 return -1;
 440
 441         obj = sdb_object_create(name, sdb_plugin_collector_cb_type,
 442                         &collector_list, "collector", callback, user_data);
 443         if (! obj)
 444                 return -1;
 445
 446         if (interval)
 447                 SDB_PLUGIN_CCB(obj)->ccb_interval = *interval;
 448         else {
 449                 sdb_time_t tmp = sdb_plugin_get_ctx().interval;
 450
 451                 if (tmp > 0)
 452                         SDB_PLUGIN_CCB(obj)->ccb_interval = tmp;
 453                 else
 454                         SDB_PLUGIN_CCB(obj)->ccb_interval = 0;
 455         }
 456
 457         if (! (SDB_PLUGIN_CCB(obj)->ccb_next_update = sdb_gettime())) {
 458                 char errbuf[1024];
 459                 sdb_log(SDB_LOG_ERR, "plugin: Failed to determine current "
 460                                 "time: %s", sdb_strerror(errno, errbuf, sizeof(errbuf)));
 461                 sdb_object_deref(obj);
 462                 return -1;
 463         }
 464
 465         if (sdb_llist_insert_sorted(collector_list, obj,
 466                                 sdb_plugin_cmp_next_update)) {
 467                 sdb_object_deref(obj);
 468                 return -1;
 469         }
 470
 471         /* pass control to the list */
 472         sdb_object_deref(obj);
 473
 474         sdb_log(SDB_LOG_INFO, "plugin: Registered collector callback '%s' "
 475                         "(interval = %.3fs).", name,
 476                         SDB_TIME_TO_DOUBLE(SDB_PLUGIN_CCB(obj)->ccb_interval));
 477         return 0;
 478 } /* sdb_plugin_register_collector */
 479
 480 sdb_plugin_ctx_t
 481 sdb_plugin_get_ctx(void)
 482 {
 483         sdb_plugin_ctx_t *ctx;
 484
 485         if (! plugin_ctx_key_initialized)
 486                 sdb_plugin_ctx_init();
 487         ctx = pthread_getspecific(plugin_ctx_key);
 488
 489         if (! ctx)
 490                 ctx = sdb_plugin_ctx_create();
 491         if (! ctx)
 492                 return plugin_default_ctx;
 493         return *ctx;
 494 } /* sdb_plugin_get_ctx */
 495
 496 sdb_plugin_ctx_t
 497 sdb_plugin_set_ctx(sdb_plugin_ctx_t ctx)
 498 {
 499         sdb_plugin_ctx_t *tmp;
 500         sdb_plugin_ctx_t old;
 501
 502         if (! plugin_ctx_key_initialized)
 503                 sdb_plugin_ctx_init();
 504         tmp = pthread_getspecific(plugin_ctx_key);
 505
 506         if (! tmp)
 507                 tmp = sdb_plugin_ctx_create();
 508         if (! tmp)
 509                 return plugin_default_ctx;
 510
 511         old = *tmp;
 512         *tmp = ctx;
 513         return old;
 514 } /* sdb_plugin_set_ctx */
 515
 516 int
 517 sdb_plugin_configure(const char *name, oconfig_item_t *ci)
 518 {
 519         sdb_plugin_cb_t *plugin;
 520         sdb_plugin_config_cb callback;
 521
 522         sdb_plugin_ctx_t old_ctx;
 523
 524         int status;
 525
 526         if ((! name) || (! ci))
 527                 return -1;
 528
 529         plugin = SDB_PLUGIN_CB(sdb_llist_search_by_name(config_list, name));
 530         if (! plugin) {
 531                 /* XXX: check if any such plugin has been loaded */
 532                 sdb_log(SDB_LOG_ERR, "plugin: Plugin '%s' did not register "
 533                                 "a config callback.", name);
 534                 errno = ENOENT;
 535                 return -1;
 536         }
 537
 538         old_ctx = sdb_plugin_set_ctx(plugin->cb_ctx);
 539         callback = plugin->cb_callback;
 540         status = callback(ci);
 541         sdb_plugin_set_ctx(old_ctx);
 542         return status;
 543 } /* sdb_plugin_configure */
 544
 545 int
 546 sdb_plugin_init_all(void)
 547 {
 548         sdb_llist_iter_t *iter;
 549
 550         iter = sdb_llist_get_iter(init_list);
 551         while (sdb_llist_iter_has_next(iter)) {
 552                 sdb_plugin_init_cb callback;
 553                 sdb_plugin_ctx_t old_ctx;
 554
 555                 sdb_object_t *obj = sdb_llist_iter_get_next(iter);
 556                 assert(obj);
 557
 558                 callback = SDB_PLUGIN_CB(obj)->cb_callback;
 559
 560                 old_ctx = sdb_plugin_set_ctx(SDB_PLUGIN_CB(obj)->cb_ctx);
 561                 if (callback(SDB_PLUGIN_CB(obj)->cb_user_data)) {
 562                         /* XXX: unload plugin */
 563                 }
 564                 sdb_plugin_set_ctx(old_ctx);
 565         }
 566         sdb_llist_iter_destroy(iter);
 567         return 0;
 568 } /* sdb_plugin_init_all */
 569
 570 int
 571 sdb_plugin_collector_loop(sdb_plugin_loop_t *loop)
 572 {
 573         if (! collector_list) {
 574                 sdb_log(SDB_LOG_WARNING, "plugin: No collectors registered. "
 575                                 "Quiting main loop.");
 576                 return -1;
 577         }
 578
 579         if (! loop)
 580                 return -1;
 581
 582         while (loop->do_loop) {
 583                 sdb_plugin_collector_cb callback;
 584                 sdb_plugin_ctx_t old_ctx;
 585
 586                 sdb_time_t interval, now;
 587
 588                 sdb_object_t *obj = sdb_llist_shift(collector_list);
 589                 if (! obj)
 590                         return -1;
 591
 592                 callback = SDB_PLUGIN_CCB(obj)->ccb_callback;
 593
 594                 if (! (now = sdb_gettime())) {
 595                         char errbuf[1024];
 596                         sdb_log(SDB_LOG_ERR, "plugin: Failed to determine current "
 597                                         "time: %s", sdb_strerror(errno, errbuf, sizeof(errbuf)));
 598                         now = SDB_PLUGIN_CCB(obj)->ccb_next_update;
 599                 }
 600
 601                 if (now < SDB_PLUGIN_CCB(obj)->ccb_next_update) {
 602                         interval = SDB_PLUGIN_CCB(obj)->ccb_next_update - now;
 603
 604                         errno = 0;
 605                         while (loop->do_loop && sdb_sleep(interval, &interval)) {
 606                                 if (errno != EINTR) {
 607                                         char errbuf[1024];
 608                                         sdb_log(SDB_LOG_ERR, "plugin: Failed to sleep: %s",
 609                                                         sdb_strerror(errno, errbuf, sizeof(errbuf)));
 610                                         return -1;
 611                                 }
 612                                 errno = 0;
 613                         }
 614
 615                         if (! loop->do_loop)
 616                                 return 0;
 617                 }
 618
 619                 old_ctx = sdb_plugin_set_ctx(SDB_PLUGIN_CCB(obj)->ccb_ctx);
 620                 if (callback(SDB_PLUGIN_CCB(obj)->ccb_user_data)) {
 621                         /* XXX */
 622                 }
 623                 sdb_plugin_set_ctx(old_ctx);
 624
 625                 interval = SDB_PLUGIN_CCB(obj)->ccb_interval;
 626                 if (! interval)
 627                         interval = loop->default_interval;
 628                 if (! interval) {
 629                         sdb_log(SDB_LOG_WARNING, "plugin: No interval configured "
 630                                         "for plugin '%s'; skipping any further "
 631                                         "iterations.", obj->name);
 632                         sdb_object_deref(obj);
 633                         continue;
 634                 }
 635
 636                 SDB_PLUGIN_CCB(obj)->ccb_next_update += interval;
 637
 638                 if (! (now = sdb_gettime())) {
 639                         char errbuf[1024];
 640                         sdb_log(SDB_LOG_ERR, "plugin: Failed to determine current "
 641                                         "time: %s", sdb_strerror(errno, errbuf, sizeof(errbuf)));
 642                         now = SDB_PLUGIN_CCB(obj)->ccb_next_update;
 643                 }
 644
 645                 if (now > SDB_PLUGIN_CCB(obj)->ccb_next_update) {
 646                         sdb_log(SDB_LOG_WARNING, "plugin: Plugin '%s' took too "
 647                                         "long; skipping iterations to keep up.",
 648                                         obj->name);
 649                         SDB_PLUGIN_CCB(obj)->ccb_next_update = now;
 650                 }
 651
 652                 if (sdb_llist_insert_sorted(collector_list, obj,
 653                                         sdb_plugin_cmp_next_update)) {
 654                         sdb_log(SDB_LOG_ERR, "plugin: Failed to re-insert "
 655                                         "plugin '%s' into collector list. Unable to further "
 656                                         "use the plugin.",
 657                                         obj->name);
 658                         sdb_object_deref(obj);
 659                         return -1;
 660                 }
 661
 662                 /* pass control back to the list */
 663                 sdb_object_deref(obj);
 664         }
 665         return 0;
 666 } /* sdb_plugin_read_loop */
 667
 668 char *
 669 sdb_plugin_cname(char *hostname)
 670 {
 671         sdb_llist_iter_t *iter;
 672
 673         if (! hostname)
 674                 return NULL;
 675
 676         if (! cname_list)
 677                 return hostname;
 678
 679         iter = sdb_llist_get_iter(cname_list);
 680         while (sdb_llist_iter_has_next(iter)) {
 681                 sdb_plugin_cname_cb callback;
 682                 char *cname;
 683
 684                 sdb_object_t *obj = sdb_llist_iter_get_next(iter);
 685                 assert(obj);
 686
 687                 callback = SDB_PLUGIN_CB(obj)->cb_callback;
 688                 cname = callback(hostname, SDB_PLUGIN_CB(obj)->cb_user_data);
 689                 if (cname) {
 690                         free(hostname);
 691                         hostname = cname;
 692                 }
 693                 /* else: don't change hostname */
 694         }
 695         sdb_llist_iter_destroy(iter);
 696         return hostname;
 697 } /* sdb_plugin_cname */
 698
 699 int
 700 sdb_plugin_log(int prio, const char *msg)
 701 {
 702         sdb_llist_iter_t *iter;
 703         int ret = -1;
 704
 705         if (! msg)
 706                 return 0;
 707
 708         if (! log_list)
 709                 return fprintf(stderr, "[%s] %s\n", SDB_LOG_PRIO_TO_STRING(prio), msg);
 710
 711         iter = sdb_llist_get_iter(log_list);
 712         while (sdb_llist_iter_has_next(iter)) {
 713                 sdb_plugin_log_cb callback;
 714                 int tmp;
 715
 716                 sdb_object_t *obj = sdb_llist_iter_get_next(iter);
 717                 assert(obj);
 718
 719                 callback = SDB_PLUGIN_CB(obj)->cb_callback;
 720                 tmp = callback(prio, msg, SDB_PLUGIN_CB(obj)->cb_user_data);
 721                 if (tmp > ret)
 722                         ret = tmp;
 723         }
 724         sdb_llist_iter_destroy(iter);
 725         return ret;
 726 } /* sdb_plugin_log */
 727
 728 int
 729 sdb_plugin_vlogf(int prio, const char *fmt, va_list ap)
 730 {
 731         sdb_strbuf_t *buf;
 732         int ret;
 733
 734         if (! fmt)
 735                 return 0;
 736
 737         buf = sdb_strbuf_create(64);
 738         if (! buf) {
 739                 ret = fprintf(stderr, "[%s] ", SDB_LOG_PRIO_TO_STRING(prio));
 740                 ret += vfprintf(stderr, fmt, ap);
 741                 return ret;
 742         }
 743
 744         if (sdb_strbuf_vsprintf(buf, fmt, ap) < 0) {
 745                 sdb_strbuf_destroy(buf);
 746                 return -1;
 747         }
 748
 749         ret = sdb_plugin_log(prio, sdb_strbuf_string(buf));
 750         sdb_strbuf_destroy(buf);
 751         return ret;
 752 } /* sdb_plugin_vlogf */
 753
 754 int
 755 sdb_plugin_logf(int prio, const char *fmt, ...)
 756 {
 757         va_list ap;
 758         int ret;
 759
 760         if (! fmt)
 761                 return 0;
 762
 763         va_start(ap, fmt);
 764         ret = sdb_plugin_vlogf(prio, fmt, ap);
 765         va_end(ap);
 766         return ret;
 767 } /* sdb_plugin_logf */
 768
 769 /* vim: set tw=78 sw=4 ts=4 noexpandtab : */
 770