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 #if HAVE_CONFIG_H
  29 #       include "config.h"
  30 #endif /* HAVE_CONFIG_H */
  31
  32 #include "sysdb.h"
  33 #include "core/plugin.h"
  34 #include "core/time.h"
  35 #include "utils/error.h"
  36 #include "utils/llist.h"
  37 #include "utils/strbuf.h"
  38
  39 #include <assert.h>
  40
  41 #include <errno.h>
  42
  43 #include <stdarg.h>
  44 #include <stdio.h>
  45 #include <string.h>
  46 #include <strings.h>
  47 #include <unistd.h>
  48
  49 #include <ltdl.h>
  50
  51 #include <pthread.h>
  52
  53 /* helper to access info attributes */
  54 #define INFO_GET(i, attr) \
  55         ((i)->attr ? (i)->attr : #attr" not set")
  56
  57 /*
  58  * private data types
  59  */
  60
  61 typedef struct {
  62         sdb_object_t super;
  63         sdb_plugin_ctx_t public;
  64
  65         sdb_plugin_info_t info;
  66         lt_dlhandle handle;
  67
  68         /* The usage count differs from the object's ref count
  69          * in that it provides higher level information about how
  70          * the plugin is in use. */
  71         size_t use_cnt;
  72 } ctx_t;
  73 #define CTX_INIT { SDB_OBJECT_INIT, \
  74         SDB_PLUGIN_CTX_INIT, SDB_PLUGIN_INFO_INIT, NULL, 0 }
  75
  76 #define CTX(obj) ((ctx_t *)(obj))
  77
  78 typedef struct {
  79         sdb_object_t super;
  80         void *cb_callback;
  81         sdb_object_t *cb_user_data;
  82         ctx_t *cb_ctx;
  83 } callback_t;
  84 #define CB_INIT { SDB_OBJECT_INIT, \
  85         /* callback = */ NULL, /* user_data = */ NULL, \
  86         SDB_PLUGIN_CTX_INIT }
  87 #define CB(obj) ((callback_t *)(obj))
  88 #define CONST_CB(obj) ((const callback_t *)(obj))
  89
  90 typedef struct {
  91         callback_t super;
  92 #define ccb_callback super.cb_callback
  93 #define ccb_user_data super.cb_user_data
  94 #define ccb_ctx super.cb_ctx
  95         sdb_time_t ccb_interval;
  96         sdb_time_t ccb_next_update;
  97 } collector_t;
  98 #define CCB(obj) ((collector_t *)(obj))
  99 #define CONST_CCB(obj) ((const collector_t *)(obj))
 100
 101 typedef struct {
 102         callback_t super; /* cb_callback will always be NULL */
 103 #define w_user_data super.cb_user_data
 104 #define w_ctx super.cb_ctx
 105         sdb_store_writer_t impl;
 106 } writer_t;
 107 #define WRITER(obj) ((writer_t *)(obj))
 108
 109 /*
 110  * private variables
 111  */
 112
 113 static sdb_plugin_ctx_t  plugin_default_ctx  = SDB_PLUGIN_CTX_INIT;
 114 static sdb_plugin_info_t plugin_default_info = SDB_PLUGIN_INFO_INIT;
 115
 116 static pthread_key_t     plugin_ctx_key;
 117 static bool              plugin_ctx_key_initialized = 0;
 118
 119 /* a list of the plugin contexts of all registered plugins */
 120 static sdb_llist_t      *all_plugins = NULL;
 121
 122 static sdb_llist_t      *config_list = NULL;
 123 static sdb_llist_t      *init_list = NULL;
 124 static sdb_llist_t      *collector_list = NULL;
 125 static sdb_llist_t      *cname_list = NULL;
 126 static sdb_llist_t      *shutdown_list = NULL;
 127 static sdb_llist_t      *log_list = NULL;
 128 static sdb_llist_t      *ts_fetcher_list = NULL;
 129 static sdb_llist_t      *writer_list = NULL;
 130
 131 static struct {
 132         const char   *type;
 133         sdb_llist_t **list;
 134 } all_lists[] = {
 135         { "config",             &config_list },
 136         { "init",               &init_list },
 137         { "collector",          &collector_list },
 138         { "cname",              &cname_list },
 139         { "shutdown",           &shutdown_list },
 140         { "log",                &log_list },
 141         { "timeseries fetcher", &ts_fetcher_list },
 142         { "store writer",       &writer_list },
 143 };
 144
 145 /*
 146  * private helper functions
 147  */
 148
 149 static void
 150 plugin_info_clear(sdb_plugin_info_t *info)
 151 {
 152         sdb_plugin_info_t empty_info = SDB_PLUGIN_INFO_INIT;
 153         if (! info)
 154                 return;
 155
 156         if (info->plugin_name)
 157                 free(info->plugin_name);
 158         if (info->filename)
 159                 free(info->filename);
 160
 161         if (info->description)
 162                 free(info->description);
 163         if (info->copyright)
 164                 free(info->copyright);
 165         if (info->license)
 166                 free(info->license);
 167
 168         *info = empty_info;
 169 } /* plugin_info_clear */
 170
 171 static void
 172 ctx_key_init(void)
 173 {
 174         if (plugin_ctx_key_initialized)
 175                 return;
 176
 177         pthread_key_create(&plugin_ctx_key, /* destructor */ NULL);
 178         plugin_ctx_key_initialized = 1;
 179 } /* ctx_key_init */
 180
 181 static int
 182 plugin_cmp_next_update(const sdb_object_t *a, const sdb_object_t *b)
 183 {
 184         const collector_t *ccb1 = (const collector_t *)a;
 185         const collector_t *ccb2 = (const collector_t *)b;
 186
 187         assert(ccb1 && ccb2);
 188
 189         return (ccb1->ccb_next_update > ccb2->ccb_next_update)
 190                 ? 1 : (ccb1->ccb_next_update < ccb2->ccb_next_update)
 191                 ? -1 : 0;
 192 } /* plugin_cmp_next_update */
 193
 194 static int
 195 plugin_lookup_by_name(const sdb_object_t *obj, const void *id)
 196 {
 197         const callback_t *cb = CONST_CB(obj);
 198         const char *name = id;
 199
 200         assert(cb && id);
 201
 202         /* when a plugin was registered from outside a plugin (e.g. the core),
 203          * we don't have a plugin context */
 204         if (! cb->cb_ctx)
 205                 return 1;
 206
 207         if (!strcasecmp(cb->cb_ctx->info.plugin_name, name))
 208                 return 0;
 209         return 1;
 210 } /* plugin_lookup_by_name */
 211
 212 /* since this function is called from sdb_plugin_reconfigure_finish()
 213  * when iterating through all_plugins, we may not do any additional
 214  * modifications to all_plugins except for the optional removal */
 215 static void
 216 plugin_unregister_by_name(const char *plugin_name)
 217 {
 218         sdb_object_t *obj;
 219         size_t i;
 220
 221         for (i = 0; i < SDB_STATIC_ARRAY_LEN(all_lists); ++i) {
 222                 const char  *type =  all_lists[i].type;
 223                 sdb_llist_t *list = *all_lists[i].list;
 224
 225                 while (1) {
 226                         callback_t *cb;
 227
 228                         cb = CB(sdb_llist_remove(list,
 229                                                 plugin_lookup_by_name, plugin_name));
 230                         if (! cb)
 231                                 break;
 232
 233                         assert(cb->cb_ctx);
 234
 235                         sdb_log(SDB_LOG_INFO, "core: Unregistering "
 236                                         "%s callback '%s' (module %s)", type, cb->super.name,
 237                                         cb->cb_ctx->info.plugin_name);
 238                         sdb_object_deref(SDB_OBJ(cb));
 239                 }
 240         }
 241
 242         obj = sdb_llist_search_by_name(all_plugins, plugin_name);
 243         /* when called from sdb_plugin_reconfigure_finish, the object has already
 244          * been removed from the list */
 245         if (obj && (obj->ref_cnt <= 1)) {
 246                 sdb_llist_remove_by_name(all_plugins, plugin_name);
 247                 sdb_object_deref(obj);
 248         }
 249         /* else: other callbacks still reference it */
 250 } /* plugin_unregister_by_name */
 251
 252 /*
 253  * private types
 254  */
 255
 256 static int
 257 ctx_init(sdb_object_t *obj, va_list __attribute__((unused)) ap)
 258 {
 259         ctx_t *ctx = CTX(obj);
 260
 261         assert(ctx);
 262
 263         ctx->public = plugin_default_ctx;
 264         ctx->info = plugin_default_info;
 265         ctx->handle = NULL;
 266         ctx->use_cnt = 1;
 267         return 0;
 268 } /* ctx_init */
 269
 270 static void
 271 ctx_destroy(sdb_object_t *obj)
 272 {
 273         ctx_t *ctx = CTX(obj);
 274
 275         if (ctx->handle) {
 276                 const char *err;
 277
 278                 sdb_log(SDB_LOG_INFO, "core: Unloading module %s",
 279                                 ctx->info.plugin_name);
 280
 281                 lt_dlerror();
 282                 lt_dlclose(ctx->handle);
 283                 if ((err = lt_dlerror()))
 284                         sdb_log(SDB_LOG_WARNING, "core: Failed to unload module %s: %s",
 285                                         ctx->info.plugin_name, err);
 286         }
 287
 288         plugin_info_clear(&ctx->info);
 289 } /* ctx_destroy */
 290
 291 static sdb_type_t ctx_type = {
 292         sizeof(ctx_t),
 293
 294         ctx_init,
 295         ctx_destroy
 296 };
 297
 298 static ctx_t *
 299 ctx_get(void)
 300 {
 301         if (! plugin_ctx_key_initialized)
 302                 ctx_key_init();
 303         return pthread_getspecific(plugin_ctx_key);
 304 } /* ctx_get */
 305
 306 static ctx_t *
 307 ctx_set(ctx_t *new)
 308 {
 309         ctx_t *old;
 310
 311         if (! plugin_ctx_key_initialized)
 312                 ctx_key_init();
 313
 314         old = pthread_getspecific(plugin_ctx_key);
 315         if (old)
 316                 sdb_object_deref(SDB_OBJ(old));
 317         if (new)
 318                 sdb_object_ref(SDB_OBJ(new));
 319         pthread_setspecific(plugin_ctx_key, new);
 320         return old;
 321 } /* ctx_set */
 322
 323 static ctx_t *
 324 ctx_create(const char *name)
 325 {
 326         ctx_t *ctx;
 327
 328         ctx = CTX(sdb_object_create(name, ctx_type));
 329         if (! ctx)
 330                 return NULL;
 331
 332         if (! plugin_ctx_key_initialized)
 333                 ctx_key_init();
 334         ctx_set(ctx);
 335         return ctx;
 336 } /* ctx_create */
 337
 338 static int
 339 plugin_cb_init(sdb_object_t *obj, va_list ap)
 340 {
 341         sdb_llist_t **list = va_arg(ap, sdb_llist_t **);
 342         const char   *type = va_arg(ap, const char *);
 343         void     *callback = va_arg(ap, void *);
 344         sdb_object_t   *ud = va_arg(ap, sdb_object_t *);
 345
 346         assert(list);
 347         assert(type);
 348         assert(obj);
 349
 350         if (sdb_llist_search_by_name(*list, obj->name)) {
 351                 sdb_log(SDB_LOG_WARNING, "core: %s callback '%s' "
 352                                 "has already been registered. Ignoring newly "
 353                                 "registered version.", type, obj->name);
 354                 return -1;
 355         }
 356
 357         /* cb_ctx may be NULL if the plugin was not registered by a plugin */
 358
 359         CB(obj)->cb_callback = callback;
 360         CB(obj)->cb_ctx      = ctx_get();
 361         sdb_object_ref(SDB_OBJ(CB(obj)->cb_ctx));
 362
 363         sdb_object_ref(ud);
 364         CB(obj)->cb_user_data = ud;
 365         return 0;
 366 } /* plugin_cb_init */
 367
 368 static void
 369 plugin_cb_destroy(sdb_object_t *obj)
 370 {
 371         assert(obj);
 372         sdb_object_deref(CB(obj)->cb_user_data);
 373         sdb_object_deref(SDB_OBJ(CB(obj)->cb_ctx));
 374 } /* plugin_cb_destroy */
 375
 376 static sdb_type_t callback_type = {
 377         sizeof(callback_t),
 378
 379         plugin_cb_init,
 380         plugin_cb_destroy
 381 };
 382
 383 static sdb_type_t collector_type = {
 384         sizeof(collector_t),
 385
 386         plugin_cb_init,
 387         plugin_cb_destroy
 388 };
 389
 390 static int
 391 plugin_writer_init(sdb_object_t *obj, va_list ap)
 392 {
 393         sdb_store_writer_t *impl = va_arg(ap, sdb_store_writer_t *);
 394         sdb_object_t       *ud   = va_arg(ap, sdb_object_t *);
 395
 396         assert(impl);
 397
 398         if ((! impl->store_host) || (! impl->store_service)
 399                         || (! impl->store_metric) || (! impl->store_attribute)
 400                         || (! impl->store_service_attr) || (! impl->store_metric_attr)) {
 401                 sdb_log(SDB_LOG_ERR, "core: store writer callback '%s' "
 402                                 "does not fully implement the writer interface.",
 403                                 obj->name);
 404                 return -1;
 405         }
 406         if (sdb_llist_search_by_name(writer_list, obj->name)) {
 407                 sdb_log(SDB_LOG_WARNING, "core: store writer callback '%s' "
 408                                 "has already been registered. Ignoring newly "
 409                                 "registered version.", obj->name);
 410                 return -1;
 411         }
 412
 413         /* ctx may be NULL if the callback was not registered by a plugin */
 414
 415         WRITER(obj)->impl = *impl;
 416         WRITER(obj)->w_ctx  = ctx_get();
 417         sdb_object_ref(SDB_OBJ(WRITER(obj)->w_ctx));
 418
 419         sdb_object_ref(ud);
 420         WRITER(obj)->w_user_data = ud;
 421         return 0;
 422 } /* plugin_writer_init */
 423
 424 static void
 425 plugin_writer_destroy(sdb_object_t *obj)
 426 {
 427         assert(obj);
 428         sdb_object_deref(WRITER(obj)->w_user_data);
 429         sdb_object_deref(SDB_OBJ(WRITER(obj)->w_ctx));
 430 } /* plugin_writer_destroy */
 431
 432 static sdb_type_t writer_type = {
 433         sizeof(writer_t),
 434
 435         plugin_writer_init,
 436         plugin_writer_destroy
 437 };
 438
 439 static int
 440 module_init(const char *name, lt_dlhandle lh, sdb_plugin_info_t *info)
 441 {
 442         int (*mod_init)(sdb_plugin_info_t *);
 443         int status;
 444
 445         mod_init = (int (*)(sdb_plugin_info_t *))lt_dlsym(lh, "sdb_module_init");
 446         if (! mod_init) {
 447                 sdb_log(SDB_LOG_ERR, "core: Failed to load plugin '%s': "
 448                                 "could not find symbol 'sdb_module_init'", name);
 449                 return -1;
 450         }
 451
 452         status = mod_init(info);
 453         if (status) {
 454                 sdb_log(SDB_LOG_ERR, "core: Failed to initialize "
 455                                 "module '%s'", name);
 456                 plugin_unregister_by_name(name);
 457                 return -1;
 458         }
 459         return 0;
 460 } /* module_init */
 461
 462 static int
 463 module_load(const char *basedir, const char *name,
 464                 const sdb_plugin_ctx_t *plugin_ctx)
 465 {
 466         char  base_name[name ? strlen(name) + 1 : 1];
 467         const char *name_ptr;
 468         char *tmp;
 469
 470         char filename[1024];
 471         lt_dlhandle lh;
 472
 473         ctx_t *ctx;
 474
 475         int status;
 476
 477         assert(name);
 478
 479         base_name[0] = '\0';
 480         name_ptr = name;
 481
 482         while ((tmp = strstr(name_ptr, "::"))) {
 483                 strncat(base_name, name_ptr, (size_t)(tmp - name_ptr));
 484                 strcat(base_name, "/");
 485                 name_ptr = tmp + strlen("::");
 486         }
 487         strcat(base_name, name_ptr);
 488
 489         if (! basedir)
 490                 basedir = PKGLIBDIR;
 491
 492         snprintf(filename, sizeof(filename), "%s/%s.so", basedir, base_name);
 493         filename[sizeof(filename) - 1] = '\0';
 494
 495         if (access(filename, R_OK)) {
 496                 char errbuf[1024];
 497                 sdb_log(SDB_LOG_ERR, "core: Failed to load plugin '%s' (%s): %s",
 498                                 name, filename, sdb_strerror(errno, errbuf, sizeof(errbuf)));
 499                 return -1;
 500         }
 501
 502         lt_dlinit();
 503         lt_dlerror();
 504
 505         lh = lt_dlopen(filename);
 506         if (! lh) {
 507                 sdb_log(SDB_LOG_ERR, "core: Failed to load plugin '%s': %s"
 508                                 "The most common cause for this problem are missing "
 509                                 "dependencies.\n", name, lt_dlerror());
 510                 return -1;
 511         }
 512
 513         if (ctx_get())
 514                 sdb_log(SDB_LOG_WARNING, "core: Discarding old plugin context");
 515
 516         ctx = ctx_create(name);
 517         if (! ctx) {
 518                 sdb_log(SDB_LOG_ERR, "core: Failed to initialize plugin context");
 519                 return -1;
 520         }
 521
 522         ctx->info.plugin_name = strdup(name);
 523         ctx->info.filename = strdup(filename);
 524         ctx->handle = lh;
 525
 526         if (plugin_ctx)
 527                 ctx->public = *plugin_ctx;
 528
 529         if ((status = module_init(name, lh, &ctx->info))) {
 530                 sdb_object_deref(SDB_OBJ(ctx));
 531                 return status;
 532         }
 533
 534         /* compare minor version */
 535         if ((ctx->info.version < 0)
 536                         || ((int)(ctx->info.version / 100) != (int)(SDB_VERSION / 100)))
 537                 sdb_log(SDB_LOG_WARNING, "core: WARNING: version of "
 538                                 "plugin '%s' (%i.%i.%i) does not match our version "
 539                                 "(%i.%i.%i); this might cause problems",
 540                                 name, SDB_VERSION_DECODE(ctx->info.version),
 541                                 SDB_VERSION_DECODE(SDB_VERSION));
 542
 543         sdb_llist_append(all_plugins, SDB_OBJ(ctx));
 544
 545         sdb_log(SDB_LOG_INFO, "core: Successfully loaded "
 546                         "plugin %s v%i (%s)", ctx->info.plugin_name,
 547                         ctx->info.plugin_version,
 548                         INFO_GET(&ctx->info, description));
 549         sdb_log(SDB_LOG_INFO, "core: Plugin %s: %s, License: %s",
 550                         ctx->info.plugin_name,
 551                         INFO_GET(&ctx->info, copyright),
 552                         INFO_GET(&ctx->info, license));
 553
 554         /* any registered callbacks took ownership of the context */
 555         sdb_object_deref(SDB_OBJ(ctx));
 556
 557         /* reset */
 558         ctx_set(NULL);
 559         return 0;
 560 } /* module_load */
 561
 562 static char *
 563 plugin_get_name(const char *name, char *buf, size_t bufsize)
 564 {
 565         ctx_t *ctx = ctx_get();
 566
 567         if (ctx)
 568                 snprintf(buf, bufsize, "%s::%s", ctx->info.plugin_name, name);
 569         else
 570                 snprintf(buf, bufsize, "core::%s", name);
 571         return buf;
 572 } /* plugin_get_name */
 573
 574 static int
 575 plugin_add_callback(sdb_llist_t **list, const char *type,
 576                 const char *name, void *callback, sdb_object_t *user_data)
 577 {
 578         sdb_object_t *obj;
 579
 580         if ((! name) || (! callback))
 581                 return -1;
 582
 583         assert(list);
 584
 585         if (! *list)
 586                 *list = sdb_llist_create();
 587         if (! *list)
 588                 return -1;
 589
 590         obj = sdb_object_create(name, callback_type,
 591                         list, type, callback, user_data);
 592         if (! obj)
 593                 return -1;
 594
 595         if (sdb_llist_append(*list, obj)) {
 596                 sdb_object_deref(obj);
 597                 return -1;
 598         }
 599
 600         /* pass control to the list */
 601         sdb_object_deref(obj);
 602
 603         sdb_log(SDB_LOG_INFO, "core: Registered %s callback '%s'.",
 604                         type, name);
 605         return 0;
 606 } /* plugin_add_callback */
 607
 608 /*
 609  * public API
 610  */
 611
 612 int
 613 sdb_plugin_load(const char *basedir, const char *name,
 614                 const sdb_plugin_ctx_t *plugin_ctx)
 615 {
 616         ctx_t *ctx;
 617
 618         int status;
 619
 620         if ((! name) || (! *name))
 621                 return -1;
 622
 623         if (! all_plugins) {
 624                 if (! (all_plugins = sdb_llist_create())) {
 625                         sdb_log(SDB_LOG_ERR, "core: Failed to load plugin '%s': "
 626                                         "internal error while creating linked list", name);
 627                         return -1;
 628                 }
 629         }
 630
 631         ctx = CTX(sdb_llist_search_by_name(all_plugins, name));
 632         if (ctx) {
 633                 /* plugin already loaded */
 634                 if (! ctx->use_cnt) {
 635                         /* reloading plugin */
 636                         ctx_t *old_ctx = ctx_set(ctx);
 637
 638                         status = module_init(ctx->info.plugin_name, ctx->handle, NULL);
 639                         if (status)
 640                                 return status;
 641
 642                         sdb_log(SDB_LOG_INFO, "core: Successfully reloaded plugin "
 643                                         "'%s' (%s)", ctx->info.plugin_name,
 644                                         INFO_GET(&ctx->info, description));
 645                         ctx_set(old_ctx);
 646                 }
 647                 ++ctx->use_cnt;
 648                 return 0;
 649         }
 650
 651         return module_load(basedir, name, plugin_ctx);
 652 } /* sdb_plugin_load */
 653
 654 int
 655 sdb_plugin_set_info(sdb_plugin_info_t *info, int type, ...)
 656 {
 657         va_list ap;
 658
 659         if (! info)
 660                 return -1;
 661
 662         va_start(ap, type);
 663
 664         switch (type) {
 665                 case SDB_PLUGIN_INFO_DESC:
 666                         {
 667                                 char *desc = va_arg(ap, char *);
 668                                 if (desc) {
 669                                         if (info->description)
 670                                                 free(info->description);
 671                                         info->description = strdup(desc);
 672                                 }
 673                         }
 674                         break;
 675                 case SDB_PLUGIN_INFO_COPYRIGHT:
 676                         {
 677                                 char *copyright = va_arg(ap, char *);
 678                                 if (copyright)
 679                                         info->copyright = strdup(copyright);
 680                         }
 681                         break;
 682                 case SDB_PLUGIN_INFO_LICENSE:
 683                         {
 684                                 char *license = va_arg(ap, char *);
 685                                 if (license) {
 686                                         if (info->license)
 687                                                 free(info->license);
 688                                         info->license = strdup(license);
 689                                 }
 690                         }
 691                         break;
 692                 case SDB_PLUGIN_INFO_VERSION:
 693                         {
 694                                 int version = va_arg(ap, int);
 695                                 info->version = version;
 696                         }
 697                         break;
 698                 case SDB_PLUGIN_INFO_PLUGIN_VERSION:
 699                         {
 700                                 int version = va_arg(ap, int);
 701                                 info->plugin_version = version;
 702                         }
 703                         break;
 704                 default:
 705                         va_end(ap);
 706                         return -1;
 707         }
 708
 709         va_end(ap);
 710         return 0;
 711 } /* sdb_plugin_set_info */
 712
 713 int
 714 sdb_plugin_register_config(sdb_plugin_config_cb callback)
 715 {
 716         ctx_t *ctx = ctx_get();
 717
 718         if (! ctx) {
 719                 sdb_log(SDB_LOG_ERR, "core: Invalid attempt to register a "
 720                                 "config callback from outside a plugin");
 721                 return -1;
 722         }
 723         return plugin_add_callback(&config_list, "config", ctx->info.plugin_name,
 724                         (void *)callback, NULL);
 725 } /* sdb_plugin_register_config */
 726
 727 int
 728 sdb_plugin_register_init(const char *name, sdb_plugin_init_cb callback,
 729                 sdb_object_t *user_data)
 730 {
 731         char cb_name[1024];
 732         return plugin_add_callback(&init_list, "init",
 733                         plugin_get_name(name, cb_name, sizeof(cb_name)),
 734                         (void *)callback, user_data);
 735 } /* sdb_plugin_register_init */
 736
 737 int
 738 sdb_plugin_register_shutdown(const char *name, sdb_plugin_shutdown_cb callback,
 739                 sdb_object_t *user_data)
 740 {
 741         char cb_name[1024];
 742         return plugin_add_callback(&shutdown_list, "shutdown",
 743                         plugin_get_name(name, cb_name, sizeof(cb_name)),
 744                         (void *)callback, user_data);
 745 } /* sdb_plugin_register_shutdown */
 746
 747 int
 748 sdb_plugin_register_log(const char *name, sdb_plugin_log_cb callback,
 749                 sdb_object_t *user_data)
 750 {
 751         char cb_name[1024];
 752         return plugin_add_callback(&log_list, "log",
 753                         plugin_get_name(name, cb_name, sizeof(cb_name)),
 754                         callback, user_data);
 755 } /* sdb_plugin_register_log */
 756
 757 int
 758 sdb_plugin_register_cname(const char *name, sdb_plugin_cname_cb callback,
 759                 sdb_object_t *user_data)
 760 {
 761         char cb_name[1024];
 762         return plugin_add_callback(&cname_list, "cname",
 763                         plugin_get_name(name, cb_name, sizeof(cb_name)),
 764                         callback, user_data);
 765 } /* sdb_plugin_register_cname */
 766
 767 int
 768 sdb_plugin_register_collector(const char *name, sdb_plugin_collector_cb callback,
 769                 const sdb_time_t *interval, sdb_object_t *user_data)
 770 {
 771         char cb_name[1024];
 772         sdb_object_t *obj;
 773
 774         if ((! name) || (! callback))
 775                 return -1;
 776
 777         if (! collector_list)
 778                 collector_list = sdb_llist_create();
 779         if (! collector_list)
 780                 return -1;
 781
 782         plugin_get_name(name, cb_name, sizeof(cb_name));
 783
 784         obj = sdb_object_create(cb_name, collector_type,
 785                         &collector_list, "collector", callback, user_data);
 786         if (! obj)
 787                 return -1;
 788
 789         if (interval)
 790                 CCB(obj)->ccb_interval = *interval;
 791         else {
 792                 ctx_t *ctx = ctx_get();
 793
 794                 if (! ctx) {
 795                         sdb_log(SDB_LOG_ERR, "core: Cannot determine interval "
 796                                         "for collector %s; none specified and no plugin "
 797                                         "context found", cb_name);
 798                         return -1;
 799                 }
 800
 801                 CCB(obj)->ccb_interval = ctx->public.interval;
 802         }
 803
 804         if (! (CCB(obj)->ccb_next_update = sdb_gettime())) {
 805                 char errbuf[1024];
 806                 sdb_log(SDB_LOG_ERR, "core: Failed to determine current "
 807                                 "time: %s", sdb_strerror(errno, errbuf, sizeof(errbuf)));
 808                 sdb_object_deref(obj);
 809                 return -1;
 810         }
 811
 812         if (sdb_llist_insert_sorted(collector_list, obj,
 813                                 plugin_cmp_next_update)) {
 814                 sdb_object_deref(obj);
 815                 return -1;
 816         }
 817
 818         /* pass control to the list */
 819         sdb_object_deref(obj);
 820
 821         sdb_log(SDB_LOG_INFO, "core: Registered collector callback '%s' "
 822                         "(interval = %.3fs).", cb_name,
 823                         SDB_TIME_TO_DOUBLE(CCB(obj)->ccb_interval));
 824         return 0;
 825 } /* sdb_plugin_register_collector */
 826
 827 int
 828 sdb_plugin_register_ts_fetcher(const char *name,
 829                 sdb_plugin_fetch_ts_cb callback, sdb_object_t *user_data)
 830 {
 831         return plugin_add_callback(&ts_fetcher_list, "time-series fetcher",
 832                         name, callback, user_data);
 833 } /* sdb_plugin_register_ts_fetcher */
 834
 835 int
 836 sdb_plugin_register_writer(const char *name,
 837                 sdb_store_writer_t *writer, sdb_object_t *user_data)
 838 {
 839         char cb_name[1024];
 840         sdb_object_t *obj;
 841
 842         if ((! name) || (! writer))
 843                 return -1;
 844
 845         if (! writer_list)
 846                 writer_list = sdb_llist_create();
 847         if (! writer_list)
 848                 return -1;
 849
 850         plugin_get_name(name, cb_name, sizeof(cb_name));
 851
 852         obj = sdb_object_create(cb_name, writer_type,
 853                         writer, user_data);
 854         if (! obj)
 855                 return -1;
 856
 857         if (sdb_llist_append(writer_list, obj)) {
 858                 sdb_object_deref(obj);
 859                 return -1;
 860         }
 861
 862         /* pass control to the list */
 863         sdb_object_deref(obj);
 864
 865         sdb_log(SDB_LOG_INFO, "core: Registered store writer callback '%s'.",
 866                         cb_name);
 867         return 0;
 868 } /* sdb_store_register_writer */
 869
 870 void
 871 sdb_plugin_unregister_all(void)
 872 {
 873         size_t i;
 874
 875         for (i = 0; i < SDB_STATIC_ARRAY_LEN(all_lists); ++i) {
 876                 const char  *type =  all_lists[i].type;
 877                 sdb_llist_t *list = *all_lists[i].list;
 878
 879                 size_t len = sdb_llist_len(list);
 880
 881                 if (! len)
 882                         continue;
 883
 884                 sdb_llist_clear(list);
 885                 sdb_log(SDB_LOG_INFO, "core: Unregistered %zu %s callback%s",
 886                                 len, type, len == 1 ? "" : "s");
 887         }
 888 } /* sdb_plugin_unregister_all */
 889
 890 sdb_plugin_ctx_t
 891 sdb_plugin_get_ctx(void)
 892 {
 893         ctx_t *c;
 894
 895         c = ctx_get();
 896         if (! c) {
 897                 sdb_plugin_log(SDB_LOG_ERR, "core: Invalid read access to plugin "
 898                                 "context outside a plugin");
 899                 return plugin_default_ctx;
 900         }
 901         return c->public;
 902 } /* sdb_plugin_get_ctx */
 903
 904 int
 905 sdb_plugin_set_ctx(sdb_plugin_ctx_t ctx, sdb_plugin_ctx_t *old)
 906 {
 907         ctx_t *c;
 908
 909         c = ctx_get();
 910         if (! c) {
 911                 sdb_plugin_log(SDB_LOG_ERR, "core: Invalid write access to plugin "
 912                                 "context outside a plugin");
 913                 return -1;
 914         }
 915
 916         if (old)
 917                 *old = c->public;
 918         c->public = ctx;
 919         return 0;
 920 } /* sdb_plugin_set_ctx */
 921
 922 const sdb_plugin_info_t *
 923 sdb_plugin_current(void)
 924 {
 925         ctx_t *ctx = ctx_get();
 926
 927         if (! ctx)
 928                 return NULL;
 929         return &ctx->info;
 930 } /* sdb_plugin_current */
 931
 932 int
 933 sdb_plugin_configure(const char *name, oconfig_item_t *ci)
 934 {
 935         callback_t *plugin;
 936         sdb_plugin_config_cb callback;
 937
 938         ctx_t *old_ctx;
 939
 940         int status;
 941
 942         if ((! name) || (! ci))
 943                 return -1;
 944
 945         plugin = CB(sdb_llist_search_by_name(config_list, name));
 946         if (! plugin) {
 947                 ctx_t *ctx = CTX(sdb_llist_search_by_name(all_plugins, name));
 948                 if (! ctx)
 949                         sdb_log(SDB_LOG_ERR, "core: Cannot configure unknown "
 950                                         "plugin '%s'. Missing 'LoadPlugin \"%s\"'?",
 951                                         name, name);
 952                 else
 953                         sdb_log(SDB_LOG_ERR, "core: Plugin '%s' did not register "
 954                                         "a config callback.", name);
 955                 errno = ENOENT;
 956                 return -1;
 957         }
 958
 959         old_ctx = ctx_set(plugin->cb_ctx);
 960         callback = (sdb_plugin_config_cb)plugin->cb_callback;
 961         status = callback(ci);
 962         ctx_set(old_ctx);
 963         return status;
 964 } /* sdb_plugin_configure */
 965
 966 int
 967 sdb_plugin_reconfigure_init(void)
 968 {
 969         sdb_llist_iter_t *iter;
 970
 971         iter = sdb_llist_get_iter(config_list);
 972         if (config_list && (! iter))
 973                 return -1;
 974
 975         /* deconfigure all plugins */
 976         while (sdb_llist_iter_has_next(iter)) {
 977                 callback_t *plugin;
 978                 sdb_plugin_config_cb callback;
 979                 ctx_t *old_ctx;
 980
 981                 plugin = CB(sdb_llist_iter_get_next(iter));
 982                 old_ctx = ctx_set(plugin->cb_ctx);
 983                 callback = (sdb_plugin_config_cb)plugin->cb_callback;
 984                 callback(NULL);
 985                 ctx_set(old_ctx);
 986         }
 987         sdb_llist_iter_destroy(iter);
 988
 989         iter = sdb_llist_get_iter(all_plugins);
 990         if (all_plugins && (! iter))
 991                 return -1;
 992
 993         /* record all plugins as being unused */
 994         while (sdb_llist_iter_has_next(iter))
 995                 CTX(sdb_llist_iter_get_next(iter))->use_cnt = 0;
 996         sdb_llist_iter_destroy(iter);
 997
 998         sdb_plugin_unregister_all();
 999         return 0;
1000 } /* sdb_plugin_reconfigure_init */
1001
1002 int
1003 sdb_plugin_reconfigure_finish(void)
1004 {
1005         sdb_llist_iter_t *iter;
1006
1007         iter = sdb_llist_get_iter(all_plugins);
1008         if (all_plugins && (! iter))
1009                 return -1;
1010
1011         while (sdb_llist_iter_has_next(iter)) {
1012                 ctx_t *ctx = CTX(sdb_llist_iter_get_next(iter));
1013                 if (ctx->use_cnt)
1014                         continue;
1015
1016                 sdb_log(SDB_LOG_INFO, "core: Module %s no longer in use",
1017                                 ctx->info.plugin_name);
1018                 sdb_llist_iter_remove_current(iter);
1019                 plugin_unregister_by_name(ctx->info.plugin_name);
1020                 sdb_object_deref(SDB_OBJ(ctx));
1021         }
1022         sdb_llist_iter_destroy(iter);
1023         return 0;
1024 } /* sdb_plugin_reconfigure_finish */
1025
1026 int
1027 sdb_plugin_init_all(void)
1028 {
1029         sdb_llist_iter_t *iter;
1030         int ret = 0;
1031
1032         iter = sdb_llist_get_iter(init_list);
1033         while (sdb_llist_iter_has_next(iter)) {
1034                 callback_t *cb;
1035                 sdb_plugin_init_cb callback;
1036                 ctx_t *old_ctx;
1037
1038                 sdb_object_t *obj = sdb_llist_iter_get_next(iter);
1039                 assert(obj);
1040                 cb = CB(obj);
1041
1042                 callback = (sdb_plugin_init_cb)cb->cb_callback;
1043
1044                 old_ctx = ctx_set(cb->cb_ctx);
1045                 if (callback(cb->cb_user_data)) {
1046                         sdb_log(SDB_LOG_ERR, "core: Failed to initialize plugin "
1047                                         "'%s'. Unregistering all callbacks.", obj->name);
1048                         ctx_set(old_ctx);
1049                         plugin_unregister_by_name(cb->cb_ctx->info.plugin_name);
1050                         ++ret;
1051                 }
1052                 else
1053                         ctx_set(old_ctx);
1054         }
1055         sdb_llist_iter_destroy(iter);
1056         return ret;
1057 } /* sdb_plugin_init_all */
1058
1059 int
1060 sdb_plugin_shutdown_all(void)
1061 {
1062         sdb_llist_iter_t *iter;
1063         int ret = 0;
1064
1065         iter = sdb_llist_get_iter(shutdown_list);
1066         while (sdb_llist_iter_has_next(iter)) {
1067                 callback_t *cb;
1068                 sdb_plugin_shutdown_cb callback;
1069                 ctx_t *old_ctx;
1070
1071                 sdb_object_t *obj = sdb_llist_iter_get_next(iter);
1072                 assert(obj);
1073                 cb = CB(obj);
1074
1075                 callback = (sdb_plugin_shutdown_cb)cb->cb_callback;
1076
1077                 old_ctx = ctx_set(cb->cb_ctx);
1078                 if (callback(cb->cb_user_data)) {
1079                         sdb_log(SDB_LOG_ERR, "core: Failed to shutdown plugin '%s'.",
1080                                         obj->name);
1081                         ++ret;
1082                 }
1083                 ctx_set(old_ctx);
1084         }
1085         sdb_llist_iter_destroy(iter);
1086         return ret;
1087 } /* sdb_plugin_shutdown_all */
1088
1089 int
1090 sdb_plugin_collector_loop(sdb_plugin_loop_t *loop)
1091 {
1092         if (! collector_list) {
1093                 sdb_log(SDB_LOG_WARNING, "core: No collectors registered. "
1094                                 "Quiting main loop.");
1095                 return -1;
1096         }
1097
1098         if (! loop)
1099                 return -1;
1100
1101         while (loop->do_loop) {
1102                 sdb_plugin_collector_cb callback;
1103                 ctx_t *old_ctx;
1104
1105                 sdb_time_t interval, now;
1106
1107                 sdb_object_t *obj = sdb_llist_shift(collector_list);
1108                 if (! obj)
1109                         return -1;
1110
1111                 callback = (sdb_plugin_collector_cb)CCB(obj)->ccb_callback;
1112
1113                 if (! (now = sdb_gettime())) {
1114                         char errbuf[1024];
1115                         sdb_log(SDB_LOG_ERR, "core: Failed to determine current "
1116                                         "time in collector main loop: %s",
1117                                         sdb_strerror(errno, errbuf, sizeof(errbuf)));
1118                         now = CCB(obj)->ccb_next_update;
1119                 }
1120
1121                 if (now < CCB(obj)->ccb_next_update) {
1122                         interval = CCB(obj)->ccb_next_update - now;
1123
1124                         errno = 0;
1125                         while (loop->do_loop && sdb_sleep(interval, &interval)) {
1126                                 if (errno != EINTR) {
1127                                         char errbuf[1024];
1128                                         sdb_log(SDB_LOG_ERR, "core: Failed to sleep "
1129                                                         "in collector main loop: %s",
1130                                                         sdb_strerror(errno, errbuf, sizeof(errbuf)));
1131                                         sdb_llist_insert_sorted(collector_list, obj,
1132                                                         plugin_cmp_next_update);
1133                                         sdb_object_deref(obj);
1134                                         return -1;
1135                                 }
1136                                 errno = 0;
1137                         }
1138
1139                         if (! loop->do_loop) {
1140                                 /* put back; don't worry about errors */
1141                                 sdb_llist_insert_sorted(collector_list, obj,
1142                                                 plugin_cmp_next_update);
1143                                 sdb_object_deref(obj);
1144                                 return 0;
1145                         }
1146                 }
1147
1148                 old_ctx = ctx_set(CCB(obj)->ccb_ctx);
1149                 if (callback(CCB(obj)->ccb_user_data)) {
1150                         /* XXX */
1151                 }
1152                 ctx_set(old_ctx);
1153
1154                 interval = CCB(obj)->ccb_interval;
1155                 if (! interval)
1156                         interval = loop->default_interval;
1157                 if (! interval) {
1158                         sdb_log(SDB_LOG_WARNING, "core: No interval configured "
1159                                         "for plugin '%s'; skipping any further "
1160                                         "iterations.", obj->name);
1161                         sdb_object_deref(obj);
1162                         continue;
1163                 }
1164
1165                 CCB(obj)->ccb_next_update += interval;
1166
1167                 if (! (now = sdb_gettime())) {
1168                         char errbuf[1024];
1169                         sdb_log(SDB_LOG_ERR, "core: Failed to determine current "
1170                                         "time in collector main loop: %s",
1171                                         sdb_strerror(errno, errbuf, sizeof(errbuf)));
1172                         now = CCB(obj)->ccb_next_update;
1173                 }
1174
1175                 if (now > CCB(obj)->ccb_next_update) {
1176                         sdb_log(SDB_LOG_WARNING, "core: Plugin '%s' took too "
1177                                         "long; skipping iterations to keep up.",
1178                                         obj->name);
1179                         CCB(obj)->ccb_next_update = now;
1180                 }
1181
1182                 if (sdb_llist_insert_sorted(collector_list, obj,
1183                                         plugin_cmp_next_update)) {
1184                         sdb_log(SDB_LOG_ERR, "core: Failed to re-insert "
1185                                         "plugin '%s' into collector list. Unable to further "
1186                                         "use the plugin.",
1187                                         obj->name);
1188                         sdb_object_deref(obj);
1189                         return -1;
1190                 }
1191
1192                 /* pass control back to the list */
1193                 sdb_object_deref(obj);
1194         }
1195         return 0;
1196 } /* sdb_plugin_read_loop */
1197
1198 char *
1199 sdb_plugin_cname(char *hostname)
1200 {
1201         sdb_llist_iter_t *iter;
1202
1203         if (! hostname)
1204                 return NULL;
1205
1206         if (! cname_list)
1207                 return hostname;
1208
1209         iter = sdb_llist_get_iter(cname_list);
1210         while (sdb_llist_iter_has_next(iter)) {
1211                 sdb_plugin_cname_cb callback;
1212                 char *cname;
1213
1214                 sdb_object_t *obj = sdb_llist_iter_get_next(iter);
1215                 assert(obj);
1216
1217                 callback = (sdb_plugin_cname_cb)CB(obj)->cb_callback;
1218                 cname = callback(hostname, CB(obj)->cb_user_data);
1219                 if (cname) {
1220                         free(hostname);
1221                         hostname = cname;
1222                 }
1223                 /* else: don't change hostname */
1224         }
1225         sdb_llist_iter_destroy(iter);
1226         return hostname;
1227 } /* sdb_plugin_cname */
1228
1229 int
1230 sdb_plugin_log(int prio, const char *msg)
1231 {
1232         sdb_llist_iter_t *iter;
1233         int ret = -1;
1234
1235         bool logged = 0;
1236
1237         if (! msg)
1238                 return 0;
1239
1240         iter = sdb_llist_get_iter(log_list);
1241         while (sdb_llist_iter_has_next(iter)) {
1242                 sdb_plugin_log_cb callback;
1243                 int tmp;
1244
1245                 sdb_object_t *obj = sdb_llist_iter_get_next(iter);
1246                 assert(obj);
1247
1248                 callback = (sdb_plugin_log_cb)CB(obj)->cb_callback;
1249                 tmp = callback(prio, msg, CB(obj)->cb_user_data);
1250                 if (tmp > ret)
1251                         ret = tmp;
1252
1253                 if (CB(obj)->cb_ctx)
1254                         logged = 1;
1255                 /* else: this is an internally registered callback */
1256         }
1257         sdb_llist_iter_destroy(iter);
1258
1259         if (! logged)
1260                 return fprintf(stderr, "[%s] %s\n", SDB_LOG_PRIO_TO_STRING(prio), msg);
1261         return ret;
1262 } /* sdb_plugin_log */
1263
1264 int
1265 sdb_plugin_vlogf(int prio, const char *fmt, va_list ap)
1266 {
1267         sdb_strbuf_t *buf;
1268         int ret;
1269
1270         if (! fmt)
1271                 return 0;
1272
1273         buf = sdb_strbuf_create(64);
1274         if (! buf) {
1275                 ret = fprintf(stderr, "[%s] ", SDB_LOG_PRIO_TO_STRING(prio));
1276                 ret += vfprintf(stderr, fmt, ap);
1277                 return ret;
1278         }
1279
1280         if (sdb_strbuf_vsprintf(buf, fmt, ap) < 0) {
1281                 sdb_strbuf_destroy(buf);
1282                 return -1;
1283         }
1284
1285         ret = sdb_plugin_log(prio, sdb_strbuf_string(buf));
1286         sdb_strbuf_destroy(buf);
1287         return ret;
1288 } /* sdb_plugin_vlogf */
1289
1290 int
1291 sdb_plugin_logf(int prio, const char *fmt, ...)
1292 {
1293         va_list ap;
1294         int ret;
1295
1296         if (! fmt)
1297                 return 0;
1298
1299         va_start(ap, fmt);
1300         ret = sdb_plugin_vlogf(prio, fmt, ap);
1301         va_end(ap);
1302         return ret;
1303 } /* sdb_plugin_logf */
1304
1305 sdb_timeseries_t *
1306 sdb_plugin_fetch_timeseries(const char *type, const char *id,
1307                 sdb_timeseries_opts_t *opts)
1308 {
1309         callback_t *plugin;
1310         sdb_plugin_fetch_ts_cb callback;
1311         sdb_timeseries_t *ts;
1312
1313         ctx_t *old_ctx;
1314
1315         if ((! type) || (! id) || (! opts))
1316                 return NULL;
1317
1318         plugin = CB(sdb_llist_search_by_name(ts_fetcher_list, type));
1319         if (! plugin) {
1320                 sdb_log(SDB_LOG_ERR, "core: Cannot fetch time-series of type %s: "
1321                                 "no such plugin loaded", type);
1322                 errno = ENOENT;
1323                 return NULL;
1324         }
1325
1326         old_ctx = ctx_set(plugin->cb_ctx);
1327         callback = (sdb_plugin_fetch_ts_cb)plugin->cb_callback;
1328         ts = callback(id, opts, plugin->cb_user_data);
1329         ctx_set(old_ctx);
1330         return ts;
1331 } /* sdb_plugin_fetch_timeseries */
1332
1333 int
1334 sdb_plugin_store_host(const char *name, sdb_time_t last_update)
1335 {
1336         sdb_llist_iter_t *iter;
1337         int status = 0;
1338
1339         if (! name)
1340                 return -1;
1341
1342         iter = sdb_llist_get_iter(writer_list);
1343         while (sdb_llist_iter_has_next(iter)) {
1344                 writer_t *writer = WRITER(sdb_llist_iter_get_next(iter));
1345                 int s;
1346                 assert(writer);
1347                 s = writer->impl.store_host(name, last_update, writer->w_user_data);
1348                 if (((s > 0) && (status >= 0)) || (s < 0))
1349                         status = s;
1350         }
1351         sdb_llist_iter_destroy(iter);
1352         return status;
1353 } /* sdb_plugin_store_host */
1354
1355 int
1356 sdb_plugin_store_service(const char *hostname, const char *name,
1357                 sdb_time_t last_update)
1358 {
1359         sdb_llist_iter_t *iter;
1360         int status = 0;
1361
1362         if ((! hostname) || (! name))
1363                 return -1;
1364
1365         iter = sdb_llist_get_iter(writer_list);
1366         while (sdb_llist_iter_has_next(iter)) {
1367                 writer_t *writer = WRITER(sdb_llist_iter_get_next(iter));
1368                 int s;
1369                 assert(writer);
1370                 s = writer->impl.store_service(hostname, name, last_update,
1371                                 writer->w_user_data);
1372                 if (((s > 0) && (status >= 0)) || (s < 0))
1373                         status = s;
1374         }
1375         sdb_llist_iter_destroy(iter);
1376         return status;
1377 } /* sdb_plugin_store_service */
1378
1379 int
1380 sdb_plugin_store_metric(const char *hostname, const char *name,
1381                 sdb_metric_store_t *store, sdb_time_t last_update)
1382 {
1383         sdb_llist_iter_t *iter;
1384         int status = 0;
1385
1386         if ((! hostname) || (! name))
1387                 return -1;
1388
1389         if (store && ((! store->type) || (! store->id)))
1390                 store = NULL;
1391
1392         iter = sdb_llist_get_iter(writer_list);
1393         while (sdb_llist_iter_has_next(iter)) {
1394                 writer_t *writer = WRITER(sdb_llist_iter_get_next(iter));
1395                 int s;
1396                 assert(writer);
1397                 s = writer->impl.store_metric(hostname, name, store, last_update,
1398                                 writer->w_user_data);
1399                 if (((s > 0) && (status >= 0)) || (s < 0))
1400                         status = s;
1401         }
1402         sdb_llist_iter_destroy(iter);
1403         return status;
1404 } /* sdb_plugin_store_metric */
1405
1406 int
1407 sdb_plugin_store_attribute(const char *hostname, const char *key,
1408                 const sdb_data_t *value, sdb_time_t last_update)
1409 {
1410         sdb_llist_iter_t *iter;
1411         int status = 0;
1412
1413         if ((! hostname) || (! key) || (! value))
1414                 return -1;
1415
1416         iter = sdb_llist_get_iter(writer_list);
1417         while (sdb_llist_iter_has_next(iter)) {
1418                 writer_t *writer = WRITER(sdb_llist_iter_get_next(iter));
1419                 int s;
1420                 assert(writer);
1421                 s = writer->impl.store_attribute(hostname, key, value, last_update,
1422                                 writer->w_user_data);
1423                 if (((s > 0) && (status >= 0)) || (s < 0))
1424                         status = s;
1425         }
1426         sdb_llist_iter_destroy(iter);
1427         return status;
1428 } /* sdb_plugin_store_attribute */
1429
1430 int
1431 sdb_plugin_store_service_attribute(const char *hostname, const char *service,
1432                 const char *key, const sdb_data_t *value, sdb_time_t last_update)
1433 {
1434         sdb_llist_iter_t *iter;
1435         int status = 0;
1436
1437         if ((! hostname) || (! service) || (! key) || (! value))
1438                 return -1;
1439
1440         iter = sdb_llist_get_iter(writer_list);
1441         while (sdb_llist_iter_has_next(iter)) {
1442                 writer_t *writer = WRITER(sdb_llist_iter_get_next(iter));
1443                 int s;
1444                 assert(writer);
1445                 s = writer->impl.store_service_attr(hostname, service,
1446                                 key, value, last_update, writer->w_user_data);
1447                 if (((s > 0) && (status >= 0)) || (s < 0))
1448                         status = s;
1449         }
1450         sdb_llist_iter_destroy(iter);
1451         return status;
1452 } /* sdb_plugin_store_service_attribute */
1453
1454 int
1455 sdb_plugin_store_metric_attribute(const char *hostname, const char *metric,
1456                 const char *key, const sdb_data_t *value, sdb_time_t last_update)
1457 {
1458         sdb_llist_iter_t *iter;
1459         int status = 0;
1460
1461         if ((! hostname) || (! metric) || (! key) || (! value))
1462                 return -1;
1463
1464         iter = sdb_llist_get_iter(writer_list);
1465         while (sdb_llist_iter_has_next(iter)) {
1466                 writer_t *writer = WRITER(sdb_llist_iter_get_next(iter));
1467                 int s;
1468                 assert(writer);
1469                 s = writer->impl.store_metric_attr(hostname, metric,
1470                                 key, value, last_update, writer->w_user_data);
1471                 if (((s > 0) && (status >= 0)) || (s < 0))
1472                         status = s;
1473         }
1474         sdb_llist_iter_destroy(iter);
1475         return status;
1476 } /* sdb_plugin_store_metric_attribute */
1477
1478 /* vim: set tw=78 sw=4 ts=4 noexpandtab : */
1479