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      *shutdown_list = NULL;
 102 static sdb_llist_t      *log_list = NULL;
 103
 104 /*
 105  * private helper functions
 106  */
 107
 108 static void
 109 sdb_plugin_ctx_destructor(void *ctx)
 110 {
 111         if (! ctx)
 112                 return;
 113         free(ctx);
 114 } /* sdb_plugin_ctx_destructor */
 115
 116 static void
 117 sdb_plugin_ctx_init(void)
 118 {
 119         if (plugin_ctx_key_initialized)
 120                 return;
 121
 122         pthread_key_create(&plugin_ctx_key, sdb_plugin_ctx_destructor);
 123         plugin_ctx_key_initialized = 1;
 124 } /* sdb_plugin_ctx_init */
 125
 126 static sdb_plugin_ctx_t *
 127 sdb_plugin_ctx_create(void)
 128 {
 129         sdb_plugin_ctx_t *ctx;
 130
 131         ctx = malloc(sizeof(*ctx));
 132         if (! ctx)
 133                 return NULL;
 134
 135         *ctx = plugin_default_ctx;
 136
 137         if (! plugin_ctx_key_initialized)
 138                 sdb_plugin_ctx_init();
 139         pthread_setspecific(plugin_ctx_key, ctx);
 140         return ctx;
 141 } /* sdb_plugin_ctx_create */
 142
 143 static int
 144 sdb_plugin_cmp_next_update(const sdb_object_t *a, const sdb_object_t *b)
 145 {
 146         const sdb_plugin_collector_cb_t *ccb1
 147                 = (const sdb_plugin_collector_cb_t *)a;
 148         const sdb_plugin_collector_cb_t *ccb2
 149                 = (const sdb_plugin_collector_cb_t *)b;
 150
 151         assert(ccb1 && ccb2);
 152
 153         return (ccb1->ccb_next_update > ccb2->ccb_next_update)
 154                 ? 1 : (ccb1->ccb_next_update < ccb2->ccb_next_update)
 155                 ? -1 : 0;
 156 } /* sdb_plugin_cmp_next_update */
 157
 158 /*
 159  * private types
 160  */
 161
 162 static int
 163 sdb_plugin_cb_init(sdb_object_t *obj, va_list ap)
 164 {
 165         sdb_llist_t **list = va_arg(ap, sdb_llist_t **);
 166         const char   *type = va_arg(ap, const char *);
 167         void     *callback = va_arg(ap, void *);
 168         sdb_object_t   *ud = va_arg(ap, sdb_object_t *);
 169
 170         assert(list);
 171         assert(type);
 172         assert(obj);
 173
 174         if (sdb_llist_search_by_name(*list, obj->name)) {
 175                 sdb_log(SDB_LOG_WARNING, "plugin: %s callback '%s' "
 176                                 "has already been registered. Ignoring newly "
 177                                 "registered version.", type, obj->name);
 178                 return -1;
 179         }
 180
 181         SDB_PLUGIN_CB(obj)->cb_callback = callback;
 182         SDB_PLUGIN_CB(obj)->cb_ctx      = sdb_plugin_get_ctx();
 183
 184         sdb_object_ref(ud);
 185         SDB_PLUGIN_CB(obj)->cb_user_data = ud;
 186         return 0;
 187 } /* sdb_plugin_cb_init */
 188
 189 static void
 190 sdb_plugin_cb_destroy(sdb_object_t *obj)
 191 {
 192         assert(obj);
 193         sdb_object_deref(SDB_PLUGIN_CB(obj)->cb_user_data);
 194 } /* sdb_plugin_cb_destroy */
 195
 196 static sdb_type_t sdb_plugin_cb_type = {
 197         sizeof(sdb_plugin_cb_t),
 198
 199         sdb_plugin_cb_init,
 200         sdb_plugin_cb_destroy,
 201         /* clone = */ NULL
 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         /* clone = */ NULL
 210 };
 211
 212 static int
 213 sdb_plugin_add_callback(sdb_llist_t **list, const char *type,
 214                 const char *name, void *callback, sdb_object_t *user_data)
 215 {
 216         sdb_object_t *obj;
 217
 218         if ((! name) || (! callback))
 219                 return -1;
 220
 221         assert(list);
 222
 223         if (! *list)
 224                 *list = sdb_llist_create();
 225         if (! *list)
 226                 return -1;
 227
 228         obj = sdb_object_create(name, sdb_plugin_cb_type,
 229                         list, type, callback, user_data);
 230         if (! obj)
 231                 return -1;
 232
 233         if (sdb_llist_append(*list, obj)) {
 234                 sdb_object_deref(obj);
 235                 return -1;
 236         }
 237
 238         /* pass control to the list */
 239         sdb_object_deref(obj);
 240
 241         sdb_log(SDB_LOG_INFO, "plugin: Registered %s callback '%s'.",
 242                         type, name);
 243         return 0;
 244 } /* sdb_plugin_add_callback */
 245
 246 /*
 247  * public API
 248  */
 249
 250 int
 251 sdb_plugin_load(const char *name)
 252 {
 253         char  real_name[strlen(name) > 0 ? strlen(name) : 1];
 254         const char *name_ptr;
 255         char *tmp;
 256
 257         char filename[1024];
 258
 259         lt_dlhandle lh;
 260
 261         int (*mod_init)(sdb_plugin_info_t *);
 262         sdb_plugin_info_t plugin_info = SDB_PLUGIN_INFO_INIT;
 263
 264         int status;
 265
 266         if ((! name) || (! *name))
 267                 return -1;
 268
 269         real_name[0] = '\0';
 270         name_ptr = name;
 271
 272         while ((tmp = strstr(name_ptr, "::"))) {
 273                 strncat(real_name, name_ptr, (size_t)(tmp - name_ptr));
 274                 strcat(real_name, "/");
 275                 name_ptr = tmp + strlen("::");
 276         }
 277         strcat(real_name, name_ptr);
 278
 279         snprintf(filename, sizeof(filename), "%s/%s.so",
 280                         PKGLIBDIR, real_name);
 281         filename[sizeof(filename) - 1] = '\0';
 282
 283         if (access(filename, R_OK)) {
 284                 char errbuf[1024];
 285                 sdb_log(SDB_LOG_ERR, "plugin: Failed to load plugin '%s' (%s): %s",
 286                                 name, filename, sdb_strerror(errno, errbuf, sizeof(errbuf)));
 287                 return -1;
 288         }
 289
 290         lt_dlinit();
 291         lt_dlerror();
 292
 293         lh = lt_dlopen(filename);
 294         if (! lh) {
 295                 sdb_log(SDB_LOG_ERR, "plugin: Failed to load plugin '%s': %s"
 296                                 "The most common cause for this problem are missing "
 297                                 "dependencies.\n", name, lt_dlerror());
 298                 return -1;
 299         }
 300
 301         mod_init = (int (*)(sdb_plugin_info_t *))lt_dlsym(lh, "sdb_module_init");
 302         if (! mod_init) {
 303                 sdb_log(SDB_LOG_ERR, "plugin: Failed to load plugin '%s': "
 304                                 "could not find symbol 'sdb_module_init'", name);
 305                 return -1;
 306         }
 307
 308         status = mod_init(&plugin_info);
 309         if (status) {
 310                 sdb_log(SDB_LOG_ERR, "plugin: Failed to initialize "
 311                                 "plugin '%s'", name);
 312                 return -1;
 313         }
 314
 315         /* compare minor version */
 316         if ((plugin_info.version < 0)
 317                         || ((int)(plugin_info.version / 100) != (int)(SDB_VERSION / 100)))
 318                 sdb_log(SDB_LOG_WARNING, "plugin: WARNING: version of "
 319                                 "plugin '%s' (%i.%i.%i) does not match our version "
 320                                 "(%i.%i.%i); this might cause problems",
 321                                 name, SDB_VERSION_DECODE(plugin_info.version),
 322                                 SDB_VERSION_DECODE(SDB_VERSION));
 323
 324         sdb_log(SDB_LOG_INFO, "plugin: Successfully loaded "
 325                         "plugin '%s' v%i (%s)\n\t%s",
 326                         plugin_info.name, plugin_info.plugin_version,
 327                         plugin_info.description, plugin_info.copyright);
 328         return 0;
 329 } /* sdb_plugin_load */
 330
 331 int
 332 sdb_plugin_set_info(sdb_plugin_info_t *info, int type, ...)
 333 {
 334         va_list ap;
 335
 336         if (! info)
 337                 return -1;
 338
 339         va_start(ap, type);
 340
 341         switch (type) {
 342                 case SDB_PLUGIN_INFO_NAME:
 343                         {
 344                                 char *name = va_arg(ap, char *);
 345                                 info->name = name;
 346                         }
 347                         break;
 348                 case SDB_PLUGIN_INFO_DESC:
 349                         {
 350                                 char *desc = va_arg(ap, char *);
 351                                 info->description = desc;
 352                         }
 353                         break;
 354                 case SDB_PLUGIN_INFO_COPYRIGHT:
 355                         {
 356                                 char *copyright = va_arg(ap, char *);
 357                                 info->copyright = copyright;
 358                         }
 359                         break;
 360                 case SDB_PLUGIN_INFO_LICENSE:
 361                         {
 362                                 char *license = va_arg(ap, char *);
 363                                 info->license = license;
 364                         }
 365                         break;
 366                 case SDB_PLUGIN_INFO_VERSION:
 367                         {
 368                                 int version = va_arg(ap, int);
 369                                 info->version = version;
 370                         }
 371                         break;
 372                 case SDB_PLUGIN_INFO_PLUGIN_VERSION:
 373                         {
 374                                 int version = va_arg(ap, int);
 375                                 info->plugin_version = version;
 376                         }
 377                         break;
 378                 default:
 379                         va_end(ap);
 380                         return -1;
 381         }
 382
 383         va_end(ap);
 384         return 0;
 385 } /* sdb_plugin_set_info */
 386
 387 int
 388 sdb_plugin_register_config(const char *name, sdb_plugin_config_cb callback)
 389 {
 390         return sdb_plugin_add_callback(&config_list, "init", name,
 391                         callback, NULL);
 392 } /* sdb_plugin_register_config */
 393
 394 int
 395 sdb_plugin_register_init(const char *name, sdb_plugin_init_cb callback,
 396                 sdb_object_t *user_data)
 397 {
 398         return sdb_plugin_add_callback(&init_list, "init", name,
 399                         callback, user_data);
 400 } /* sdb_plugin_register_init */
 401
 402 int
 403 sdb_plugin_register_shutdown(const char *name, sdb_plugin_shutdown_cb callback,
 404                 sdb_object_t *user_data)
 405 {
 406         return sdb_plugin_add_callback(&shutdown_list, "shutdown", name,
 407                         callback, user_data);
 408 } /* sdb_plugin_register_shutdown */
 409
 410 int
 411 sdb_plugin_register_log(const char *name, sdb_plugin_log_cb callback,
 412                 sdb_object_t *user_data)
 413 {
 414         return sdb_plugin_add_callback(&log_list, "log", name, callback,
 415                         user_data);
 416 } /* sdb_plugin_register_log */
 417
 418 int
 419 sdb_plugin_register_collector(const char *name, sdb_plugin_collector_cb callback,
 420                 const sdb_time_t *interval, sdb_object_t *user_data)
 421 {
 422         sdb_object_t *obj;
 423
 424         if ((! name) || (! callback))
 425                 return -1;
 426
 427         if (! collector_list)
 428                 collector_list = sdb_llist_create();
 429         if (! collector_list)
 430                 return -1;
 431
 432         obj = sdb_object_create(name, sdb_plugin_collector_cb_type,
 433                         &collector_list, "collector", callback, user_data);
 434         if (! obj)
 435                 return -1;
 436
 437         if (interval)
 438                 SDB_PLUGIN_CCB(obj)->ccb_interval = *interval;
 439         else {
 440                 sdb_time_t tmp = sdb_plugin_get_ctx().interval;
 441
 442                 if (tmp > 0)
 443                         SDB_PLUGIN_CCB(obj)->ccb_interval = tmp;
 444                 else
 445                         SDB_PLUGIN_CCB(obj)->ccb_interval = 0;
 446         }
 447
 448         if (! (SDB_PLUGIN_CCB(obj)->ccb_next_update = sdb_gettime())) {
 449                 char errbuf[1024];
 450                 sdb_log(SDB_LOG_ERR, "plugin: Failed to determine current "
 451                                 "time: %s", sdb_strerror(errno, errbuf, sizeof(errbuf)));
 452                 sdb_object_deref(obj);
 453                 return -1;
 454         }
 455
 456         if (sdb_llist_insert_sorted(collector_list, obj,
 457                                 sdb_plugin_cmp_next_update)) {
 458                 sdb_object_deref(obj);
 459                 return -1;
 460         }
 461
 462         /* pass control to the list */
 463         sdb_object_deref(obj);
 464
 465         sdb_log(SDB_LOG_INFO, "plugin: Registered collector callback '%s' "
 466                         "(interval = %.3fs).", name,
 467                         SDB_TIME_TO_DOUBLE(SDB_PLUGIN_CCB(obj)->ccb_interval));
 468         return 0;
 469 } /* sdb_plugin_register_collector */
 470
 471 sdb_plugin_ctx_t
 472 sdb_plugin_get_ctx(void)
 473 {
 474         sdb_plugin_ctx_t *ctx;
 475
 476         if (! plugin_ctx_key_initialized)
 477                 sdb_plugin_ctx_init();
 478         ctx = pthread_getspecific(plugin_ctx_key);
 479
 480         if (! ctx)
 481                 ctx = sdb_plugin_ctx_create();
 482         if (! ctx)
 483                 return plugin_default_ctx;
 484         return *ctx;
 485 } /* sdb_plugin_get_ctx */
 486
 487 sdb_plugin_ctx_t
 488 sdb_plugin_set_ctx(sdb_plugin_ctx_t ctx)
 489 {
 490         sdb_plugin_ctx_t *tmp;
 491         sdb_plugin_ctx_t old;
 492
 493         if (! plugin_ctx_key_initialized)
 494                 sdb_plugin_ctx_init();
 495         tmp = pthread_getspecific(plugin_ctx_key);
 496
 497         if (! tmp)
 498                 tmp = sdb_plugin_ctx_create();
 499         if (! tmp)
 500                 return plugin_default_ctx;
 501
 502         old = *tmp;
 503         *tmp = ctx;
 504         return old;
 505 } /* sdb_plugin_set_ctx */
 506
 507 int
 508 sdb_plugin_configure(const char *name, oconfig_item_t *ci)
 509 {
 510         sdb_plugin_cb_t *plugin;
 511         sdb_plugin_config_cb callback;
 512
 513         sdb_plugin_ctx_t old_ctx;
 514
 515         int status;
 516
 517         if ((! name) || (! ci))
 518                 return -1;
 519
 520         plugin = SDB_PLUGIN_CB(sdb_llist_search_by_name(config_list, name));
 521         if (! plugin) {
 522                 /* XXX: check if any such plugin has been loaded */
 523                 sdb_log(SDB_LOG_ERR, "plugin: Plugin '%s' did not register "
 524                                 "a config callback.", name);
 525                 errno = ENOENT;
 526                 return -1;
 527         }
 528
 529         old_ctx = sdb_plugin_set_ctx(plugin->cb_ctx);
 530         callback = plugin->cb_callback;
 531         status = callback(ci);
 532         sdb_plugin_set_ctx(old_ctx);
 533         return status;
 534 } /* sdb_plugin_configure */
 535
 536 int
 537 sdb_plugin_init_all(void)
 538 {
 539         sdb_llist_iter_t *iter;
 540
 541         iter = sdb_llist_get_iter(init_list);
 542         while (sdb_llist_iter_has_next(iter)) {
 543                 sdb_plugin_init_cb callback;
 544                 sdb_plugin_ctx_t old_ctx;
 545
 546                 sdb_object_t *obj = sdb_llist_iter_get_next(iter);
 547                 assert(obj);
 548
 549                 callback = SDB_PLUGIN_CB(obj)->cb_callback;
 550
 551                 old_ctx = sdb_plugin_set_ctx(SDB_PLUGIN_CB(obj)->cb_ctx);
 552                 if (callback(SDB_PLUGIN_CB(obj)->cb_user_data)) {
 553                         /* XXX: unload plugin */
 554                 }
 555                 sdb_plugin_set_ctx(old_ctx);
 556         }
 557         sdb_llist_iter_destroy(iter);
 558         return 0;
 559 } /* sdb_plugin_init_all */
 560
 561 int
 562 sdb_plugin_collector_loop(sdb_plugin_loop_t *loop)
 563 {
 564         if (! collector_list) {
 565                 sdb_log(SDB_LOG_WARNING, "plugin: No collectors registered. "
 566                                 "Quiting main loop.");
 567                 return -1;
 568         }
 569
 570         if (! loop)
 571                 return -1;
 572
 573         while (loop->do_loop) {
 574                 sdb_plugin_collector_cb callback;
 575                 sdb_plugin_ctx_t old_ctx;
 576
 577                 sdb_time_t interval, now;
 578
 579                 sdb_object_t *obj = sdb_llist_shift(collector_list);
 580                 if (! obj)
 581                         return -1;
 582
 583                 callback = SDB_PLUGIN_CCB(obj)->ccb_callback;
 584
 585                 if (! (now = sdb_gettime())) {
 586                         char errbuf[1024];
 587                         sdb_log(SDB_LOG_ERR, "plugin: Failed to determine current "
 588                                         "time: %s", sdb_strerror(errno, errbuf, sizeof(errbuf)));
 589                         now = SDB_PLUGIN_CCB(obj)->ccb_next_update;
 590                 }
 591
 592                 if (now < SDB_PLUGIN_CCB(obj)->ccb_next_update) {
 593                         interval = SDB_PLUGIN_CCB(obj)->ccb_next_update - now;
 594
 595                         errno = 0;
 596                         while (loop->do_loop && sdb_sleep(interval, &interval)) {
 597                                 if (errno != EINTR) {
 598                                         char errbuf[1024];
 599                                         sdb_log(SDB_LOG_ERR, "plugin: Failed to sleep: %s",
 600                                                         sdb_strerror(errno, errbuf, sizeof(errbuf)));
 601                                         return -1;
 602                                 }
 603                                 errno = 0;
 604                         }
 605
 606                         if (! loop->do_loop)
 607                                 return 0;
 608                 }
 609
 610                 old_ctx = sdb_plugin_set_ctx(SDB_PLUGIN_CCB(obj)->ccb_ctx);
 611                 if (callback(SDB_PLUGIN_CCB(obj)->ccb_user_data)) {
 612                         /* XXX */
 613                 }
 614                 sdb_plugin_set_ctx(old_ctx);
 615
 616                 interval = SDB_PLUGIN_CCB(obj)->ccb_interval;
 617                 if (! interval)
 618                         interval = loop->default_interval;
 619                 if (! interval) {
 620                         sdb_log(SDB_LOG_WARNING, "plugin: No interval configured "
 621                                         "for plugin '%s'; skipping any further "
 622                                         "iterations.", obj->name);
 623                         sdb_object_deref(obj);
 624                         continue;
 625                 }
 626
 627                 SDB_PLUGIN_CCB(obj)->ccb_next_update += interval;
 628
 629                 if (! (now = sdb_gettime())) {
 630                         char errbuf[1024];
 631                         sdb_log(SDB_LOG_ERR, "plugin: Failed to determine current "
 632                                         "time: %s", sdb_strerror(errno, errbuf, sizeof(errbuf)));
 633                         now = SDB_PLUGIN_CCB(obj)->ccb_next_update;
 634                 }
 635
 636                 if (now > SDB_PLUGIN_CCB(obj)->ccb_next_update) {
 637                         sdb_log(SDB_LOG_WARNING, "plugin: Plugin '%s' took too "
 638                                         "long; skipping iterations to keep up.",
 639                                         obj->name);
 640                         SDB_PLUGIN_CCB(obj)->ccb_next_update = now;
 641                 }
 642
 643                 if (sdb_llist_insert_sorted(collector_list, obj,
 644                                         sdb_plugin_cmp_next_update)) {
 645                         sdb_log(SDB_LOG_ERR, "plugin: Failed to re-insert "
 646                                         "plugin '%s' into collector list. Unable to further "
 647                                         "use the plugin.",
 648                                         obj->name);
 649                         sdb_object_deref(obj);
 650                         return -1;
 651                 }
 652
 653                 /* pass control back to the list */
 654                 sdb_object_deref(obj);
 655         }
 656         return 0;
 657 } /* sdb_plugin_read_loop */
 658
 659 int
 660 sdb_plugin_log(int prio, const char *msg)
 661 {
 662         sdb_llist_iter_t *iter;
 663         int ret = -1;
 664
 665         if (! msg)
 666                 return 0;
 667
 668         if (! log_list)
 669                 return fprintf(stderr, "[%s] %s\n", SDB_LOG_PRIO_TO_STRING(prio), msg);
 670
 671         iter = sdb_llist_get_iter(log_list);
 672         while (sdb_llist_iter_has_next(iter)) {
 673                 sdb_plugin_log_cb callback;
 674                 int tmp;
 675
 676                 sdb_object_t *obj = sdb_llist_iter_get_next(iter);
 677                 assert(obj);
 678
 679                 callback = SDB_PLUGIN_CB(obj)->cb_callback;
 680                 tmp = callback(prio, msg, SDB_PLUGIN_CB(obj)->cb_user_data);
 681                 if (tmp > ret)
 682                         ret = tmp;
 683         }
 684         sdb_llist_iter_destroy(iter);
 685         return ret;
 686 } /* sdb_plugin_log */
 687
 688 int
 689 sdb_plugin_vlogf(int prio, const char *fmt, va_list ap)
 690 {
 691         sdb_strbuf_t *buf;
 692         int ret;
 693
 694         if (! fmt)
 695                 return 0;
 696
 697         buf = sdb_strbuf_create(64);
 698         if (! buf) {
 699                 ret = fprintf(stderr, "[%s] ", SDB_LOG_PRIO_TO_STRING(prio));
 700                 ret += vfprintf(stderr, fmt, ap);
 701                 return ret;
 702         }
 703
 704         if (sdb_strbuf_vsprintf(buf, fmt, ap) < 0) {
 705                 sdb_strbuf_destroy(buf);
 706                 return -1;
 707         }
 708
 709         ret = sdb_plugin_log(prio, sdb_strbuf_string(buf));
 710         sdb_strbuf_destroy(buf);
 711         return ret;
 712 } /* sdb_plugin_vlogf */
 713
 714 int
 715 sdb_plugin_logf(int prio, const char *fmt, ...)
 716 {
 717         va_list ap;
 718         int ret;
 719
 720         if (! fmt)
 721                 return 0;
 722
 723         va_start(ap, fmt);
 724         ret = sdb_plugin_vlogf(prio, fmt, ap);
 725         va_end(ap);
 726         return ret;
 727 } /* sdb_plugin_logf */
 728
 729 /* vim: set tw=78 sw=4 ts=4 noexpandtab : */
 730