src/core/store.c

   1 /*
   2  * SysDB - src/core/store.c
   3  * Copyright (C) 2012-2013 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/store-private.h"
  34 #include "core/plugin.h"
  35 #include "utils/avltree.h"
  36 #include "utils/error.h"
  37
  38 #include <assert.h>
  39
  40 #include <errno.h>
  41
  42 #include <stdio.h>
  43 #include <stdlib.h>
  44 #include <string.h>
  45
  46 #include <pthread.h>
  47
  48 /*
  49  * private variables
  50  */
  51
  52 static sdb_avltree_t *hosts = NULL;
  53 static pthread_rwlock_t host_lock = PTHREAD_RWLOCK_INITIALIZER;
  54
  55 /*
  56  * private types
  57  */
  58
  59 static sdb_type_t sdb_host_type;
  60 static sdb_type_t sdb_service_type;
  61 static sdb_type_t sdb_metric_type;
  62 static sdb_type_t sdb_attribute_type;
  63
  64 static int
  65 store_obj_init(sdb_object_t *obj, va_list ap)
  66 {
  67         sdb_store_obj_t *sobj = STORE_OBJ(obj);
  68
  69         sobj->type = va_arg(ap, int);
  70
  71         sobj->last_update = va_arg(ap, sdb_time_t);
  72         sobj->interval = 0;
  73         sobj->backends = NULL;
  74         sobj->backends_num = 0;
  75         sobj->parent = NULL;
  76         return 0;
  77 } /* store_obj_init */
  78
  79 static void
  80 store_obj_destroy(sdb_object_t *obj)
  81 {
  82         sdb_store_obj_t *sobj = STORE_OBJ(obj);
  83         size_t i;
  84
  85         for (i = 0; i < sobj->backends_num; ++i)
  86                 free(sobj->backends[i]);
  87         free(sobj->backends);
  88         sobj->backends = NULL;
  89         sobj->backends_num = 0;
  90
  91         if (sobj->parent)
  92                 sdb_object_deref(SDB_OBJ(sobj->parent));
  93 } /* store_obj_destroy */
  94
  95 static int
  96 sdb_host_init(sdb_object_t *obj, va_list ap)
  97 {
  98         sdb_host_t *sobj = HOST(obj);
  99         int ret;
 100
 101         /* this will consume the first argument (type) of ap */
 102         ret = store_obj_init(obj, ap);
 103         if (ret)
 104                 return ret;
 105
 106         sobj->services = sdb_avltree_create();
 107         if (! sobj->services)
 108                 return -1;
 109         sobj->metrics = sdb_avltree_create();
 110         if (! sobj->metrics)
 111                 return -1;
 112         sobj->attributes = sdb_avltree_create();
 113         if (! sobj->attributes)
 114                 return -1;
 115         return 0;
 116 } /* sdb_host_init */
 117
 118 static void
 119 sdb_host_destroy(sdb_object_t *obj)
 120 {
 121         sdb_host_t *sobj = HOST(obj);
 122         assert(obj);
 123
 124         store_obj_destroy(obj);
 125
 126         if (sobj->services)
 127                 sdb_avltree_destroy(sobj->services);
 128         if (sobj->metrics)
 129                 sdb_avltree_destroy(sobj->metrics);
 130         if (sobj->attributes)
 131                 sdb_avltree_destroy(sobj->attributes);
 132 } /* sdb_host_destroy */
 133
 134 static int
 135 sdb_service_init(sdb_object_t *obj, va_list ap)
 136 {
 137         sdb_service_t *sobj = SVC(obj);
 138         int ret;
 139
 140         /* this will consume the first argument (type) of ap */
 141         ret = store_obj_init(obj, ap);
 142         if (ret)
 143                 return ret;
 144
 145         sobj->attributes = sdb_avltree_create();
 146         if (! sobj->attributes)
 147                 return -1;
 148         return 0;
 149 } /* sdb_service_init */
 150
 151 static void
 152 sdb_service_destroy(sdb_object_t *obj)
 153 {
 154         sdb_service_t *sobj = SVC(obj);
 155         assert(obj);
 156
 157         store_obj_destroy(obj);
 158
 159         if (sobj->attributes)
 160                 sdb_avltree_destroy(sobj->attributes);
 161 } /* sdb_service_destroy */
 162
 163 static int
 164 sdb_metric_init(sdb_object_t *obj, va_list ap)
 165 {
 166         sdb_metric_t *sobj = METRIC(obj);
 167         int ret;
 168
 169         /* this will consume the first argument (type) of ap */
 170         ret = store_obj_init(obj, ap);
 171         if (ret)
 172                 return ret;
 173
 174         sobj->attributes = sdb_avltree_create();
 175         if (! sobj->attributes)
 176                 return -1;
 177         return 0;
 178 } /* sdb_metric_init */
 179
 180 static void
 181 sdb_metric_destroy(sdb_object_t *obj)
 182 {
 183         sdb_metric_t *sobj = METRIC(obj);
 184         assert(obj);
 185
 186         store_obj_destroy(obj);
 187
 188         if (sobj->attributes)
 189                 sdb_avltree_destroy(sobj->attributes);
 190 } /* sdb_metric_destroy */
 191
 192 static int
 193 sdb_attr_init(sdb_object_t *obj, va_list ap)
 194 {
 195         const sdb_data_t *value;
 196         int ret;
 197
 198         /* this will consume the first two arguments
 199          * (type and last_update) of ap */
 200         ret = store_obj_init(obj, ap);
 201         if (ret)
 202                 return ret;
 203         value = va_arg(ap, const sdb_data_t *);
 204
 205         if (value)
 206                 if (sdb_data_copy(&ATTR(obj)->value, value))
 207                         return -1;
 208         return 0;
 209 } /* sdb_attr_init */
 210
 211 static void
 212 sdb_attr_destroy(sdb_object_t *obj)
 213 {
 214         assert(obj);
 215
 216         store_obj_destroy(obj);
 217         sdb_data_free_datum(&ATTR(obj)->value);
 218 } /* sdb_attr_destroy */
 219
 220 static sdb_type_t sdb_host_type = {
 221         sizeof(sdb_host_t),
 222         sdb_host_init,
 223         sdb_host_destroy
 224 };
 225
 226 static sdb_type_t sdb_service_type = {
 227         sizeof(sdb_service_t),
 228         sdb_service_init,
 229         sdb_service_destroy
 230 };
 231
 232 static sdb_type_t sdb_metric_type = {
 233         sizeof(sdb_metric_t),
 234         sdb_metric_init,
 235         sdb_metric_destroy
 236 };
 237
 238 static sdb_type_t sdb_attribute_type = {
 239         sizeof(sdb_attribute_t),
 240         sdb_attr_init,
 241         sdb_attr_destroy
 242 };
 243
 244 /*
 245  * private helper functions
 246  */
 247
 248 static sdb_host_t *
 249 lookup_host(const char *name)
 250 {
 251         return HOST(sdb_avltree_lookup(hosts, name));
 252 } /* lookup_host */
 253
 254 static int
 255 record_backend(sdb_store_obj_t *obj)
 256 {
 257         const sdb_plugin_info_t *info;
 258         char **tmp;
 259         size_t i;
 260
 261         info = sdb_plugin_current();
 262         if (! info)
 263                 return 0;
 264
 265         for (i = 0; i < obj->backends_num; ++i)
 266                 if (!strcasecmp(obj->backends[i], info->plugin_name))
 267                         return 0;
 268
 269         tmp = realloc(obj->backends,
 270                         (obj->backends_num + 1) * sizeof(*obj->backends));
 271         if (! tmp)
 272                 return -1;
 273
 274         obj->backends = tmp;
 275         obj->backends[obj->backends_num] = strdup(info->plugin_name);
 276         if (! obj->backends[obj->backends_num])
 277                 return -1;
 278
 279         ++obj->backends_num;
 280         return 0;
 281 } /* record_backend */
 282
 283 static int
 284 store_obj(sdb_avltree_t *parent_tree, int type, const char *name,
 285                 sdb_time_t last_update, sdb_store_obj_t **updated_obj)
 286 {
 287         sdb_store_obj_t *old, *new;
 288         int status = 0;
 289
 290         assert(parent_tree);
 291
 292         if (last_update <= 0)
 293                 last_update = sdb_gettime();
 294
 295         old = STORE_OBJ(sdb_avltree_lookup(parent_tree, name));
 296         if (old) {
 297                 if (old->last_update > last_update) {
 298                         sdb_log(SDB_LOG_DEBUG, "store: Cannot update %s '%s' - "
 299                                         "value too old (%"PRIsdbTIME" < %"PRIsdbTIME")",
 300                                         SDB_STORE_TYPE_TO_NAME(type), name,
 301                                         last_update, old->last_update);
 302                         /* don't report an error; the object may be updated by multiple
 303                          * backends */
 304                         status = 1;
 305                 }
 306                 else if (old->last_update == last_update) {
 307                         /* don't report an error and also don't even log this to avoid
 308                          * excessive noise on high sampling frequencies */
 309                         status = 1;
 310                 }
 311                 else {
 312                         sdb_time_t interval = last_update - old->last_update;
 313                         old->last_update = last_update;
 314                         if (interval) {
 315                                 if (old->interval)
 316                                         old->interval = (sdb_time_t)((0.9 * (double)old->interval)
 317                                                         + (0.1 * (double)interval));
 318                                 else
 319                                         old->interval = interval;
 320                         }
 321                 }
 322
 323                 new = old;
 324                 sdb_object_deref(SDB_OBJ(old));
 325         }
 326         else {
 327                 if (type == SDB_ATTRIBUTE) {
 328                         /* the value will be updated by the caller */
 329                         new = STORE_OBJ(sdb_object_create(name, sdb_attribute_type,
 330                                                 type, last_update, NULL));
 331                 }
 332                 else {
 333                         sdb_type_t t;
 334                         t = type == SDB_HOST
 335                                 ? sdb_host_type
 336                                 : type == SDB_SERVICE
 337                                         ? sdb_service_type
 338                                         : sdb_metric_type;
 339                         new = STORE_OBJ(sdb_object_create(name, t, type, last_update));
 340                 }
 341
 342                 if (new) {
 343                         status = sdb_avltree_insert(parent_tree, SDB_OBJ(new));
 344
 345                         /* pass control to the tree or destroy in case of an error */
 346                         sdb_object_deref(SDB_OBJ(new));
 347                 }
 348                 else {
 349                         char errbuf[1024];
 350                         sdb_log(SDB_LOG_ERR, "store: Failed to create %s '%s': %s",
 351                                         SDB_STORE_TYPE_TO_NAME(type), name,
 352                                         sdb_strerror(errno, errbuf, sizeof(errbuf)));
 353                         status = -1;
 354                 }
 355         }
 356
 357         if (status < 0)
 358                 return status;
 359         assert(new);
 360
 361         if (updated_obj)
 362                 *updated_obj = new;
 363
 364         if (record_backend(new))
 365                 return -1;
 366         return status;
 367 } /* store_obj */
 368
 369 static int
 370 store_attr(sdb_avltree_t *attributes, const char *key, const sdb_data_t *value,
 371                 sdb_time_t last_update)
 372 {
 373         sdb_store_obj_t *attr = NULL;
 374         int status;
 375
 376         status = store_obj(attributes, SDB_ATTRIBUTE, key, last_update, &attr);
 377         if (status)
 378                 return status;
 379
 380         /* don't update unchanged values */
 381         if (! sdb_data_cmp(&ATTR(attr)->value, value))
 382                 return status;
 383
 384         assert(attr);
 385         if (sdb_data_copy(&ATTR(attr)->value, value))
 386                 return -1;
 387         return status;
 388 } /* store_attr */
 389
 390 /* The host_lock has to be acquired before calling this function. */
 391 static sdb_avltree_t *
 392 get_host_children(const char *hostname, int type)
 393 {
 394         char *cname = NULL;
 395         sdb_host_t *host;
 396
 397         assert(hostname);
 398         assert((type == SDB_SERVICE) || (type == SDB_ATTRIBUTE));
 399
 400         if (! hosts)
 401                 return NULL;
 402
 403         cname = sdb_plugin_cname(strdup(hostname));
 404         if (! cname) {
 405                 sdb_log(SDB_LOG_ERR, "store: strdup failed");
 406                 return NULL;
 407         }
 408
 409         host = lookup_host(cname);
 410         free(cname);
 411         if (! host)
 412                 return NULL;
 413
 414         sdb_object_deref(SDB_OBJ(host));
 415         if (type == SDB_ATTRIBUTE)
 416                 return host->attributes;
 417         else if (type == SDB_METRIC)
 418                 return host->metrics;
 419         else
 420                 return host->services;
 421 } /* get_host_children */
 422
 423 /*
 424  * store_common_tojson serializes common object attributes to JSON.
 425  *
 426  * The function never returns an error. Rather, an error message will be part
 427  * of the serialized data.
 428  */
 429 static void
 430 store_common_tojson(sdb_store_obj_t *obj, sdb_strbuf_t *buf)
 431 {
 432         char time_str[64];
 433         char interval_str[64];
 434         size_t i;
 435
 436         if (! sdb_strftime(time_str, sizeof(time_str),
 437                                 "%F %T %z", obj->last_update))
 438                 snprintf(time_str, sizeof(time_str), "<error>");
 439         time_str[sizeof(time_str) - 1] = '\0';
 440
 441         if (! sdb_strfinterval(interval_str, sizeof(interval_str),
 442                                 obj->interval))
 443                 snprintf(interval_str, sizeof(interval_str), "<error>");
 444         interval_str[sizeof(interval_str) - 1] = '\0';
 445
 446         sdb_strbuf_append(buf, "\"last_update\": \"%s\", "
 447                         "\"update_interval\": \"%s\", \"backends\": [",
 448                         time_str, interval_str);
 449
 450         for (i = 0; i < obj->backends_num; ++i) {
 451                 sdb_strbuf_append(buf, "\"%s\"", obj->backends[i]);
 452                 if (i < obj->backends_num - 1)
 453                         sdb_strbuf_append(buf, ",");
 454         }
 455         sdb_strbuf_append(buf, "]");
 456 } /* store_common_tojson */
 457
 458 /*
 459  * store_obj_tojson serializes attribute / service objects to JSON.
 460  *
 461  * The function never returns an error. Rather, an error message will be part
 462  * of the serialized data.
 463  */
 464 static void
 465 store_obj_tojson(sdb_avltree_t *tree, int type, sdb_strbuf_t *buf,
 466                 sdb_store_matcher_t *filter, int flags)
 467 {
 468         sdb_avltree_iter_t *iter;
 469
 470         assert((type == SDB_ATTRIBUTE)
 471                         || (type == SDB_METRIC)
 472                         || (type == SDB_SERVICE));
 473
 474         sdb_strbuf_append(buf, "[");
 475         iter = sdb_avltree_get_iter(tree);
 476         if (! iter) {
 477                 char errbuf[1024];
 478                 sdb_log(SDB_LOG_ERR, "store: Failed to retrieve %ss: %s\n",
 479                                 SDB_STORE_TYPE_TO_NAME(type),
 480                                 sdb_strerror(errno, errbuf, sizeof(errbuf)));
 481                 sdb_strbuf_append(buf, "{\"error\": \"failed to retrieve %ss: %s\"}",
 482                                 SDB_STORE_TYPE_TO_NAME(type), errbuf);
 483         }
 484
 485         /* has_next returns false if the iterator is NULL */
 486         while (sdb_avltree_iter_has_next(iter)) {
 487                 sdb_store_obj_t *sobj = STORE_OBJ(sdb_avltree_iter_get_next(iter));
 488                 assert(sobj);
 489                 assert(sobj->type == type);
 490
 491                 if (filter && (! sdb_store_matcher_matches(filter, sobj, NULL)))
 492                         continue;
 493
 494                 sdb_strbuf_append(buf, "{\"name\": \"%s\", ", SDB_OBJ(sobj)->name);
 495                 if (sobj->type == SDB_ATTRIBUTE) {
 496                         char tmp[sdb_data_strlen(&ATTR(sobj)->value) + 1];
 497                         sdb_data_format(&ATTR(sobj)->value, tmp, sizeof(tmp),
 498                                         SDB_DOUBLE_QUOTED);
 499                         sdb_strbuf_append(buf, "\"value\": %s, ", tmp);
 500                 }
 501                 store_common_tojson(sobj, buf);
 502
 503                 if ((sobj->type == SDB_SERVICE)
 504                                 && (! (flags & SDB_SKIP_ATTRIBUTES))) {
 505                         sdb_strbuf_append(buf, ", \"attributes\": ");
 506                         store_obj_tojson(SVC(sobj)->attributes, SDB_ATTRIBUTE,
 507                                         buf, filter, flags);
 508                 }
 509                 else if ((sobj->type == SDB_METRIC)
 510                                 && (! (flags & SDB_SKIP_ATTRIBUTES))) {
 511                         sdb_strbuf_append(buf, ", \"attributes\": ");
 512                         store_obj_tojson(METRIC(sobj)->attributes, SDB_ATTRIBUTE,
 513                                         buf, filter, flags);
 514                 }
 515                 sdb_strbuf_append(buf, "}");
 516
 517                 if (sdb_avltree_iter_has_next(iter))
 518                         sdb_strbuf_append(buf, ",");
 519         }
 520
 521         sdb_avltree_iter_destroy(iter);
 522         sdb_strbuf_append(buf, "]");
 523 } /* store_obj_tojson */
 524
 525 /*
 526  * public API
 527  */
 528
 529 void
 530 sdb_store_clear(void)
 531 {
 532         sdb_avltree_destroy(hosts);
 533         hosts = NULL;
 534 } /* sdb_store_clear */
 535
 536 int
 537 sdb_store_host(const char *name, sdb_time_t last_update)
 538 {
 539         char *cname = NULL;
 540         int status = 0;
 541
 542         if (! name)
 543                 return -1;
 544
 545         cname = sdb_plugin_cname(strdup(name));
 546         if (! cname) {
 547                 sdb_log(SDB_LOG_ERR, "store: strdup failed");
 548                 return -1;
 549         }
 550
 551         pthread_rwlock_wrlock(&host_lock);
 552         if (! hosts)
 553                 if (! (hosts = sdb_avltree_create()))
 554                         status = -1;
 555
 556         if (! status)
 557                 status = store_obj(hosts, SDB_HOST, cname, last_update, NULL);
 558         pthread_rwlock_unlock(&host_lock);
 559
 560         free(cname);
 561         return status;
 562 } /* sdb_store_host */
 563
 564 _Bool
 565 sdb_store_has_host(const char *name)
 566 {
 567         sdb_host_t *host;
 568
 569         if (! name)
 570                 return NULL;
 571
 572         host = lookup_host(name);
 573         return host != NULL;
 574 } /* sdb_store_has_host */
 575
 576 sdb_store_obj_t *
 577 sdb_store_get_host(const char *name)
 578 {
 579         sdb_host_t *host;
 580
 581         if (! name)
 582                 return NULL;
 583
 584         host = lookup_host(name);
 585         if (! host)
 586                 return NULL;
 587
 588         return STORE_OBJ(host);
 589 } /* sdb_store_get_host */
 590
 591 int
 592 sdb_store_attribute(const char *hostname,
 593                 const char *key, const sdb_data_t *value,
 594                 sdb_time_t last_update)
 595 {
 596         sdb_avltree_t *attrs;
 597         int status = 0;
 598
 599         if ((! hostname) || (! key))
 600                 return -1;
 601
 602         pthread_rwlock_wrlock(&host_lock);
 603         attrs = get_host_children(hostname, SDB_ATTRIBUTE);
 604         if (! attrs) {
 605                 sdb_log(SDB_LOG_ERR, "store: Failed to store attribute '%s' - "
 606                                 "host '%s' not found", key, hostname);
 607                 status = -1;
 608         }
 609
 610         if (! status)
 611                 status = store_attr(attrs, key, value, last_update);
 612
 613         pthread_rwlock_unlock(&host_lock);
 614         return status;
 615 } /* sdb_store_attribute */
 616
 617 int
 618 sdb_store_service(const char *hostname, const char *name,
 619                 sdb_time_t last_update)
 620 {
 621         sdb_avltree_t *services;
 622
 623         int status = 0;
 624
 625         if ((! hostname) || (! name))
 626                 return -1;
 627
 628         pthread_rwlock_wrlock(&host_lock);
 629         services = get_host_children(hostname, SDB_SERVICE);
 630         if (! services) {
 631                 sdb_log(SDB_LOG_ERR, "store: Failed to store service '%s' - "
 632                                 "host '%s' not found", name, hostname);
 633                 status = -1;
 634         }
 635
 636         if (! status)
 637                 status = store_obj(services, SDB_SERVICE, name, last_update, NULL);
 638         pthread_rwlock_unlock(&host_lock);
 639         return status;
 640 } /* sdb_store_service */
 641
 642 int
 643 sdb_store_service_attr(const char *hostname, const char *service,
 644                 const char *key, const sdb_data_t *value, sdb_time_t last_update)
 645 {
 646         sdb_avltree_t *services;
 647         sdb_service_t *svc;
 648         int status = 0;
 649
 650         if ((! hostname) || (! service) || (! key))
 651                 return -1;
 652
 653         pthread_rwlock_wrlock(&host_lock);
 654         services = get_host_children(hostname, SDB_SERVICE);
 655         if (! services) {
 656                 sdb_log(SDB_LOG_ERR, "store: Failed to store attribute '%s' "
 657                                 "for service '%s' - host '%ss' not found",
 658                                 key, service, hostname);
 659                 pthread_rwlock_unlock(&host_lock);
 660                 return -1;
 661         }
 662
 663         svc = SVC(sdb_avltree_lookup(services, service));
 664         if (! svc) {
 665                 sdb_log(SDB_LOG_ERR, "store: Failed to store attribute '%s' - "
 666                                 "service '%s/%s' not found", key, hostname, service);
 667                 status = -1;
 668         }
 669
 670         if (! status)
 671                 status = store_attr(svc->attributes, key, value, last_update);
 672
 673         sdb_object_deref(SDB_OBJ(svc));
 674         pthread_rwlock_unlock(&host_lock);
 675         return status;
 676 } /* sdb_store_service_attr */
 677
 678 int
 679 sdb_store_get_field(sdb_store_obj_t *obj, int field, sdb_data_t *res)
 680 {
 681         if ((! obj) || (! res))
 682                 return -1;
 683
 684         switch (field) {
 685                 case SDB_FIELD_LAST_UPDATE:
 686                         res->type = SDB_TYPE_DATETIME;
 687                         res->data.datetime = obj->last_update;
 688                         break;
 689                 case SDB_FIELD_AGE:
 690                         res->type = SDB_TYPE_DATETIME;
 691                         res->data.datetime = sdb_gettime() - obj->last_update;
 692                         break;
 693                 case SDB_FIELD_INTERVAL:
 694                         res->type = SDB_TYPE_DATETIME;
 695                         res->data.datetime = obj->interval;
 696                         break;
 697                 case SDB_FIELD_BACKEND:
 698                         /* TODO: add support for storing array values in a data object
 699                          * for now, fall thru to the error case */
 700                 default:
 701                         return -1;
 702         }
 703         return 0;
 704 } /* sdb_store_get_field */
 705
 706 int
 707 sdb_store_host_tojson(sdb_store_obj_t *h, sdb_strbuf_t *buf,
 708                 sdb_store_matcher_t *filter, int flags)
 709 {
 710         sdb_host_t *host = HOST(h);
 711
 712         if ((! h) || (h->type != SDB_HOST) || (! buf))
 713                 return -1;
 714
 715         sdb_strbuf_append(buf, "{\"name\": \"%s\", ", SDB_OBJ(host)->name);
 716         store_common_tojson(h, buf);
 717
 718         if (! (flags & SDB_SKIP_ATTRIBUTES)) {
 719                 sdb_strbuf_append(buf, ", \"attributes\": ");
 720                 store_obj_tojson(host->attributes, SDB_ATTRIBUTE, buf, filter, flags);
 721         }
 722
 723         if (! (flags & SDB_SKIP_METRICS)) {
 724                 sdb_strbuf_append(buf, ", \"metrics\": ");
 725                 store_obj_tojson(host->metrics, SDB_METRIC, buf, filter, flags);
 726         }
 727
 728         if (! (flags & SDB_SKIP_SERVICES)) {
 729                 sdb_strbuf_append(buf, ", \"services\": ");
 730                 store_obj_tojson(host->services, SDB_SERVICE, buf, filter, flags);
 731         }
 732
 733         sdb_strbuf_append(buf, "}");
 734         return 0;
 735 } /* sdb_store_host_tojson */
 736
 737 int
 738 sdb_store_tojson(sdb_strbuf_t *buf, sdb_store_matcher_t *filter, int flags)
 739 {
 740         sdb_avltree_iter_t *host_iter;
 741         size_t len;
 742
 743         if (! buf)
 744                 return -1;
 745
 746         pthread_rwlock_rdlock(&host_lock);
 747
 748         host_iter = sdb_avltree_get_iter(hosts);
 749         if (! host_iter) {
 750                 pthread_rwlock_unlock(&host_lock);
 751                 return -1;
 752         }
 753
 754         sdb_strbuf_append(buf, "{\"hosts\":[");
 755
 756         len = sdb_strbuf_len(buf);
 757         while (sdb_avltree_iter_has_next(host_iter)) {
 758                 sdb_store_obj_t *host;
 759
 760                 host = STORE_OBJ(sdb_avltree_iter_get_next(host_iter));
 761                 assert(host);
 762
 763                 if (filter && (! sdb_store_matcher_matches(filter, host, NULL)))
 764                         continue;
 765
 766                 if (sdb_strbuf_len(buf) > len)
 767                         sdb_strbuf_append(buf, ",");
 768                 len = sdb_strbuf_len(buf);
 769
 770                 if (sdb_store_host_tojson(host, buf, filter, flags))
 771                         return -1;
 772         }
 773
 774         sdb_strbuf_append(buf, "]}");
 775
 776         sdb_avltree_iter_destroy(host_iter);
 777         pthread_rwlock_unlock(&host_lock);
 778         return 0;
 779 } /* sdb_store_tojson */
 780
 781 /* TODO: actually support hierarchical data */
 782 int
 783 sdb_store_iterate(sdb_store_iter_cb cb, void *user_data)
 784 {
 785         sdb_avltree_iter_t *host_iter;
 786         int status = 0;
 787
 788         pthread_rwlock_rdlock(&host_lock);
 789
 790         host_iter = sdb_avltree_get_iter(hosts);
 791         if (! host_iter)
 792                 status = -1;
 793
 794         /* has_next returns false if the iterator is NULL */
 795         while (sdb_avltree_iter_has_next(host_iter)) {
 796                 sdb_store_obj_t *host;
 797
 798                 host = STORE_OBJ(sdb_avltree_iter_get_next(host_iter));
 799                 assert(host);
 800
 801                 if (cb(host, user_data)) {
 802                         status = -1;
 803                         break;
 804                 }
 805         }
 806
 807         sdb_avltree_iter_destroy(host_iter);
 808         pthread_rwlock_unlock(&host_lock);
 809         return status;
 810 } /* sdb_store_iterate */
 811
 812 /* vim: set tw=78 sw=4 ts=4 noexpandtab : */
 813