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         // We don't currently keep an extra reference for parent objects to
  92         // avoid circular self-references which are not handled correctly by
  93         // the ref-count base management layer.
  94         //sdb_object_deref(SDB_OBJ(sobj->parent));
  95 } /* store_obj_destroy */
  96
  97 static int
  98 sdb_host_init(sdb_object_t *obj, va_list ap)
  99 {
 100         sdb_host_t *sobj = HOST(obj);
 101         int ret;
 102
 103         /* this will consume the first argument (type) of ap */
 104         ret = store_obj_init(obj, ap);
 105         if (ret)
 106                 return ret;
 107
 108         sobj->services = sdb_avltree_create();
 109         if (! sobj->services)
 110                 return -1;
 111         sobj->metrics = sdb_avltree_create();
 112         if (! sobj->metrics)
 113                 return -1;
 114         sobj->attributes = sdb_avltree_create();
 115         if (! sobj->attributes)
 116                 return -1;
 117         return 0;
 118 } /* sdb_host_init */
 119
 120 static void
 121 sdb_host_destroy(sdb_object_t *obj)
 122 {
 123         sdb_host_t *sobj = HOST(obj);
 124         assert(obj);
 125
 126         store_obj_destroy(obj);
 127
 128         if (sobj->services)
 129                 sdb_avltree_destroy(sobj->services);
 130         if (sobj->metrics)
 131                 sdb_avltree_destroy(sobj->metrics);
 132         if (sobj->attributes)
 133                 sdb_avltree_destroy(sobj->attributes);
 134 } /* sdb_host_destroy */
 135
 136 static int
 137 sdb_service_init(sdb_object_t *obj, va_list ap)
 138 {
 139         sdb_service_t *sobj = SVC(obj);
 140         int ret;
 141
 142         /* this will consume the first argument (type) of ap */
 143         ret = store_obj_init(obj, ap);
 144         if (ret)
 145                 return ret;
 146
 147         sobj->attributes = sdb_avltree_create();
 148         if (! sobj->attributes)
 149                 return -1;
 150         return 0;
 151 } /* sdb_service_init */
 152
 153 static void
 154 sdb_service_destroy(sdb_object_t *obj)
 155 {
 156         sdb_service_t *sobj = SVC(obj);
 157         assert(obj);
 158
 159         store_obj_destroy(obj);
 160
 161         if (sobj->attributes)
 162                 sdb_avltree_destroy(sobj->attributes);
 163 } /* sdb_service_destroy */
 164
 165 static int
 166 sdb_metric_init(sdb_object_t *obj, va_list ap)
 167 {
 168         sdb_metric_t *sobj = METRIC(obj);
 169         int ret;
 170
 171         /* this will consume the first argument (type) of ap */
 172         ret = store_obj_init(obj, ap);
 173         if (ret)
 174                 return ret;
 175
 176         sobj->attributes = sdb_avltree_create();
 177         if (! sobj->attributes)
 178                 return -1;
 179
 180         sobj->store.type = sobj->store.id = NULL;
 181         return 0;
 182 } /* sdb_metric_init */
 183
 184 static void
 185 sdb_metric_destroy(sdb_object_t *obj)
 186 {
 187         sdb_metric_t *sobj = METRIC(obj);
 188         assert(obj);
 189
 190         store_obj_destroy(obj);
 191
 192         if (sobj->attributes)
 193                 sdb_avltree_destroy(sobj->attributes);
 194
 195         if (sobj->store.type)
 196                 free(sobj->store.type);
 197         if (sobj->store.id)
 198                 free(sobj->store.id);
 199 } /* sdb_metric_destroy */
 200
 201 static int
 202 sdb_attr_init(sdb_object_t *obj, va_list ap)
 203 {
 204         const sdb_data_t *value;
 205         int ret;
 206
 207         /* this will consume the first two arguments
 208          * (type and last_update) of ap */
 209         ret = store_obj_init(obj, ap);
 210         if (ret)
 211                 return ret;
 212         value = va_arg(ap, const sdb_data_t *);
 213
 214         if (value)
 215                 if (sdb_data_copy(&ATTR(obj)->value, value))
 216                         return -1;
 217         return 0;
 218 } /* sdb_attr_init */
 219
 220 static void
 221 sdb_attr_destroy(sdb_object_t *obj)
 222 {
 223         assert(obj);
 224
 225         store_obj_destroy(obj);
 226         sdb_data_free_datum(&ATTR(obj)->value);
 227 } /* sdb_attr_destroy */
 228
 229 static sdb_type_t sdb_host_type = {
 230         sizeof(sdb_host_t),
 231         sdb_host_init,
 232         sdb_host_destroy
 233 };
 234
 235 static sdb_type_t sdb_service_type = {
 236         sizeof(sdb_service_t),
 237         sdb_service_init,
 238         sdb_service_destroy
 239 };
 240
 241 static sdb_type_t sdb_metric_type = {
 242         sizeof(sdb_metric_t),
 243         sdb_metric_init,
 244         sdb_metric_destroy
 245 };
 246
 247 static sdb_type_t sdb_attribute_type = {
 248         sizeof(sdb_attribute_t),
 249         sdb_attr_init,
 250         sdb_attr_destroy
 251 };
 252
 253 /*
 254  * private helper functions
 255  */
 256
 257 static sdb_host_t *
 258 lookup_host(const char *name, _Bool canonicalize)
 259 {
 260         sdb_host_t *host;
 261         char *cname;
 262
 263         assert(name);
 264         if (! canonicalize)
 265                 return HOST(sdb_avltree_lookup(hosts, name));
 266
 267         cname = strdup(name);
 268         cname = sdb_plugin_cname(cname);
 269         if (! cname) {
 270                 sdb_log(SDB_LOG_ERR, "store: strdup failed");
 271                 return NULL;
 272         }
 273
 274         host = HOST(sdb_avltree_lookup(hosts, cname));
 275         free(cname);
 276         return host;
 277 } /* lookup_host */
 278
 279 static int
 280 record_backend(sdb_store_obj_t *obj)
 281 {
 282         const sdb_plugin_info_t *info;
 283         char **tmp;
 284         size_t i;
 285
 286         info = sdb_plugin_current();
 287         if (! info)
 288                 return 0;
 289
 290         for (i = 0; i < obj->backends_num; ++i)
 291                 if (!strcasecmp(obj->backends[i], info->plugin_name))
 292                         return 0;
 293
 294         tmp = realloc(obj->backends,
 295                         (obj->backends_num + 1) * sizeof(*obj->backends));
 296         if (! tmp)
 297                 return -1;
 298
 299         obj->backends = tmp;
 300         obj->backends[obj->backends_num] = strdup(info->plugin_name);
 301         if (! obj->backends[obj->backends_num])
 302                 return -1;
 303
 304         ++obj->backends_num;
 305         return 0;
 306 } /* record_backend */
 307
 308 static int
 309 store_obj(sdb_store_obj_t *parent, sdb_avltree_t *parent_tree,
 310                 int type, const char *name, sdb_time_t last_update,
 311                 sdb_store_obj_t **updated_obj)
 312 {
 313         sdb_store_obj_t *old, *new;
 314         int status = 0;
 315
 316         assert(parent_tree);
 317
 318         if (last_update <= 0)
 319                 last_update = sdb_gettime();
 320
 321         old = STORE_OBJ(sdb_avltree_lookup(parent_tree, name));
 322         if (old) {
 323                 if (old->last_update > last_update) {
 324                         sdb_log(SDB_LOG_DEBUG, "store: Cannot update %s '%s' - "
 325                                         "value too old (%"PRIsdbTIME" < %"PRIsdbTIME")",
 326                                         SDB_STORE_TYPE_TO_NAME(type), name,
 327                                         last_update, old->last_update);
 328                         /* don't report an error; the object may be updated by multiple
 329                          * backends */
 330                         status = 1;
 331                 }
 332                 else if (old->last_update == last_update) {
 333                         /* don't report an error and also don't even log this to avoid
 334                          * excessive noise on high sampling frequencies */
 335                         status = 1;
 336                 }
 337                 else {
 338                         sdb_time_t interval = last_update - old->last_update;
 339                         old->last_update = last_update;
 340                         if (interval) {
 341                                 if (old->interval)
 342                                         old->interval = (sdb_time_t)((0.9 * (double)old->interval)
 343                                                         + (0.1 * (double)interval));
 344                                 else
 345                                         old->interval = interval;
 346                         }
 347                 }
 348
 349                 new = old;
 350                 sdb_object_deref(SDB_OBJ(old));
 351         }
 352         else {
 353                 if (type == SDB_ATTRIBUTE) {
 354                         /* the value will be updated by the caller */
 355                         new = STORE_OBJ(sdb_object_create(name, sdb_attribute_type,
 356                                                 type, last_update, NULL));
 357                 }
 358                 else {
 359                         sdb_type_t t;
 360                         t = type == SDB_HOST
 361                                 ? sdb_host_type
 362                                 : type == SDB_SERVICE
 363                                         ? sdb_service_type
 364                                         : sdb_metric_type;
 365                         new = STORE_OBJ(sdb_object_create(name, t, type, last_update));
 366                 }
 367
 368                 if (new) {
 369                         status = sdb_avltree_insert(parent_tree, SDB_OBJ(new));
 370
 371                         /* pass control to the tree or destroy in case of an error */
 372                         sdb_object_deref(SDB_OBJ(new));
 373                 }
 374                 else {
 375                         char errbuf[1024];
 376                         sdb_log(SDB_LOG_ERR, "store: Failed to create %s '%s': %s",
 377                                         SDB_STORE_TYPE_TO_NAME(type), name,
 378                                         sdb_strerror(errno, errbuf, sizeof(errbuf)));
 379                         status = -1;
 380                 }
 381         }
 382
 383         if (status < 0)
 384                 return status;
 385         assert(new);
 386
 387         if (new->parent != parent) {
 388                 // Avoid circular self-references which are not handled
 389                 // correctly by the ref-count based management layer.
 390                 //sdb_object_deref(SDB_OBJ(new->parent));
 391                 //sdb_object_ref(SDB_OBJ(parent));
 392                 new->parent = parent;
 393         }
 394
 395         if (updated_obj)
 396                 *updated_obj = new;
 397
 398         if (record_backend(new))
 399                 return -1;
 400         return status;
 401 } /* store_obj */
 402
 403 static int
 404 store_attr(sdb_store_obj_t *parent, sdb_avltree_t *attributes,
 405                 const char *key, const sdb_data_t *value, sdb_time_t last_update)
 406 {
 407         sdb_store_obj_t *attr = NULL;
 408         int status;
 409
 410         status = store_obj(parent, attributes, SDB_ATTRIBUTE,
 411                         key, last_update, &attr);
 412         if (status)
 413                 return status;
 414
 415         /* don't update unchanged values */
 416         if (! sdb_data_cmp(&ATTR(attr)->value, value))
 417                 return status;
 418
 419         assert(attr);
 420         if (sdb_data_copy(&ATTR(attr)->value, value))
 421                 return -1;
 422         return status;
 423 } /* store_attr */
 424
 425 /* The host_lock has to be acquired before calling this function. */
 426 static sdb_avltree_t *
 427 get_host_children(sdb_host_t *host, int type)
 428 {
 429         if ((type != SDB_SERVICE) && (type != SDB_METRIC)
 430                         && (type != SDB_ATTRIBUTE))
 431                 return NULL;
 432
 433         if (! host)
 434                 return NULL;
 435
 436         if (type == SDB_ATTRIBUTE)
 437                 return host->attributes;
 438         else if (type == SDB_METRIC)
 439                 return host->metrics;
 440         else
 441                 return host->services;
 442 } /* get_host_children */
 443
 444 /*
 445  * ts_tojson serializes a time-series to JSON.
 446  *
 447  * The function never returns an error. Rather, an error message will be part
 448  * of the serialized data.
 449  */
 450 static void
 451 ts_tojson(sdb_timeseries_t *ts, sdb_strbuf_t *buf)
 452 {
 453         char start_str[64];
 454         char end_str[64];
 455
 456         size_t i;
 457
 458         /* TODO: make time format configurable */
 459         if (! sdb_strftime(start_str, sizeof(start_str),
 460                                 "%F %T %z", ts->start))
 461                 snprintf(start_str, sizeof(start_str), "<error>");
 462         start_str[sizeof(start_str) - 1] = '\0';
 463         if (! sdb_strftime(end_str, sizeof(end_str),
 464                                 "%F %T %z", ts->end))
 465                 snprintf(end_str, sizeof(end_str), "<error>");
 466         end_str[sizeof(end_str) - 1] = '\0';
 467
 468         sdb_strbuf_append(buf, "{\"start\": \"%s\", \"end\": \"%s\", \"data\": {",
 469                         start_str, end_str);
 470
 471         for (i = 0; i < ts->data_names_len; ++i) {
 472                 size_t j;
 473                 sdb_strbuf_append(buf, "\"%s\": [", ts->data_names[i]);
 474
 475                 for (j = 0; j < ts->data_len; ++j) {
 476                         char time_str[64];
 477
 478                         if (! sdb_strftime(time_str, sizeof(time_str),
 479                                                 "%F %T %z", ts->data[i][j].timestamp))
 480                                 snprintf(time_str, sizeof(time_str), "<error>");
 481                         time_str[sizeof(time_str) - 1] = '\0';
 482
 483                         sdb_strbuf_append(buf, "{\"timestamp\": \"%s\", "
 484                                         "\"value\": \"%f\"}", time_str, ts->data[i][j].value);
 485
 486                         if (j < ts->data_len - 1)
 487                                 sdb_strbuf_append(buf, ",");
 488                 }
 489
 490                 if (i < ts->data_names_len - 1)
 491                         sdb_strbuf_append(buf, "],");
 492                 else
 493                         sdb_strbuf_append(buf, "]");
 494         }
 495         sdb_strbuf_append(buf, "}}");
 496 } /* ts_tojson */
 497
 498 /*
 499  * public API
 500  */
 501
 502 void
 503 sdb_store_clear(void)
 504 {
 505         sdb_avltree_destroy(hosts);
 506         hosts = NULL;
 507 } /* sdb_store_clear */
 508
 509 int
 510 sdb_store_host(const char *name, sdb_time_t last_update)
 511 {
 512         char *cname = NULL;
 513         int status = 0;
 514
 515         if (! name)
 516                 return -1;
 517
 518         cname = sdb_plugin_cname(strdup(name));
 519         if (! cname) {
 520                 sdb_log(SDB_LOG_ERR, "store: strdup failed");
 521                 return -1;
 522         }
 523
 524         pthread_rwlock_wrlock(&host_lock);
 525         if (! hosts)
 526                 if (! (hosts = sdb_avltree_create()))
 527                         status = -1;
 528
 529         if (! status)
 530                 status = store_obj(NULL, hosts, SDB_HOST, cname, last_update, NULL);
 531         pthread_rwlock_unlock(&host_lock);
 532
 533         free(cname);
 534         return status;
 535 } /* sdb_store_host */
 536
 537 _Bool
 538 sdb_store_has_host(const char *name)
 539 {
 540         sdb_host_t *host;
 541
 542         if (! name)
 543                 return NULL;
 544
 545         host = lookup_host(name, /* canonicalize = */ 0);
 546         sdb_object_deref(SDB_OBJ(host));
 547         return host != NULL;
 548 } /* sdb_store_has_host */
 549
 550 sdb_store_obj_t *
 551 sdb_store_get_host(const char *name)
 552 {
 553         sdb_host_t *host;
 554
 555         if (! name)
 556                 return NULL;
 557
 558         host = lookup_host(name, /* canonicalize = */ 0);
 559         if (! host)
 560                 return NULL;
 561
 562         return STORE_OBJ(host);
 563 } /* sdb_store_get_host */
 564
 565 int
 566 sdb_store_attribute(const char *hostname,
 567                 const char *key, const sdb_data_t *value,
 568                 sdb_time_t last_update)
 569 {
 570         sdb_host_t *host;
 571         sdb_avltree_t *attrs;
 572         int status = 0;
 573
 574         if ((! hostname) || (! key))
 575                 return -1;
 576
 577         pthread_rwlock_wrlock(&host_lock);
 578         host = lookup_host(hostname, /* canonicalize = */ 1);
 579         attrs = get_host_children(host, SDB_ATTRIBUTE);
 580         if (! attrs) {
 581                 sdb_log(SDB_LOG_ERR, "store: Failed to store attribute '%s' - "
 582                                 "host '%s' not found", key, hostname);
 583                 status = -1;
 584         }
 585
 586         if (! status)
 587                 status = store_attr(STORE_OBJ(host), attrs, key, value, last_update);
 588
 589         sdb_object_deref(SDB_OBJ(host));
 590         pthread_rwlock_unlock(&host_lock);
 591         return status;
 592 } /* sdb_store_attribute */
 593
 594 int
 595 sdb_store_service(const char *hostname, const char *name,
 596                 sdb_time_t last_update)
 597 {
 598         sdb_host_t *host;
 599         sdb_avltree_t *services;
 600
 601         int status = 0;
 602
 603         if ((! hostname) || (! name))
 604                 return -1;
 605
 606         pthread_rwlock_wrlock(&host_lock);
 607         host = lookup_host(hostname, /* canonicalize = */ 1);
 608         services = get_host_children(host, SDB_SERVICE);
 609         if (! services) {
 610                 sdb_log(SDB_LOG_ERR, "store: Failed to store service '%s' - "
 611                                 "host '%s' not found", name, hostname);
 612                 status = -1;
 613         }
 614
 615         if (! status)
 616                 status = store_obj(STORE_OBJ(host), services, SDB_SERVICE,
 617                                 name, last_update, NULL);
 618
 619         sdb_object_deref(SDB_OBJ(host));
 620         pthread_rwlock_unlock(&host_lock);
 621         return status;
 622 } /* sdb_store_service */
 623
 624 int
 625 sdb_store_service_attr(const char *hostname, const char *service,
 626                 const char *key, const sdb_data_t *value, sdb_time_t last_update)
 627 {
 628         sdb_host_t *host;
 629         sdb_service_t *svc;
 630         sdb_avltree_t *services;
 631         int status = 0;
 632
 633         if ((! hostname) || (! service) || (! key))
 634                 return -1;
 635
 636         pthread_rwlock_wrlock(&host_lock);
 637         host = lookup_host(hostname, /* canonicalize = */ 1);
 638         services = get_host_children(host, SDB_SERVICE);
 639         sdb_object_deref(SDB_OBJ(host));
 640         if (! services) {
 641                 sdb_log(SDB_LOG_ERR, "store: Failed to store attribute '%s' "
 642                                 "for service '%s' - host '%ss' not found",
 643                                 key, service, hostname);
 644                 pthread_rwlock_unlock(&host_lock);
 645                 return -1;
 646         }
 647
 648         svc = SVC(sdb_avltree_lookup(services, service));
 649         if (! svc) {
 650                 sdb_log(SDB_LOG_ERR, "store: Failed to store attribute '%s' - "
 651                                 "service '%s/%s' not found", key, hostname, service);
 652                 status = -1;
 653         }
 654
 655         if (! status)
 656                 status = store_attr(STORE_OBJ(svc), svc->attributes,
 657                                 key, value, last_update);
 658
 659         sdb_object_deref(SDB_OBJ(svc));
 660         pthread_rwlock_unlock(&host_lock);
 661         return status;
 662 } /* sdb_store_service_attr */
 663
 664 int
 665 sdb_store_metric(const char *hostname, const char *name,
 666                 sdb_metric_store_t *store, sdb_time_t last_update)
 667 {
 668         sdb_store_obj_t *obj = NULL;
 669         sdb_host_t *host;
 670         sdb_metric_t *metric;
 671
 672         sdb_avltree_t *metrics;
 673
 674         int status = 0;
 675
 676         if ((! hostname) || (! name))
 677                 return -1;
 678         if (store && ((! store->type) || (! store->id)))
 679                 return -1;
 680
 681         pthread_rwlock_wrlock(&host_lock);
 682         host = lookup_host(hostname, /* canonicalize = */ 1);
 683         metrics = get_host_children(host, SDB_METRIC);
 684         if (! metrics) {
 685                 sdb_log(SDB_LOG_ERR, "store: Failed to store metric '%s' - "
 686                                 "host '%s' not found", name, hostname);
 687                 status = -1;
 688         }
 689
 690         if (! status)
 691                 status = store_obj(STORE_OBJ(host), metrics, SDB_METRIC,
 692                                 name, last_update, &obj);
 693         sdb_object_deref(SDB_OBJ(host));
 694
 695         if (status || (! store)) {
 696                 pthread_rwlock_unlock(&host_lock);
 697                 return status;
 698         }
 699
 700         assert(obj);
 701         metric = METRIC(obj);
 702
 703         if ((! metric->store.type) || strcasecmp(metric->store.type, store->type)) {
 704                 if (metric->store.type)
 705                         free(metric->store.type);
 706                 metric->store.type = strdup(store->type);
 707         }
 708         if ((! metric->store.id) || strcasecmp(metric->store.id, store->id)) {
 709                 if (metric->store.id)
 710                         free(metric->store.id);
 711                 metric->store.id = strdup(store->id);
 712         }
 713
 714         if ((! metric->store.type) || (! metric->store.id)) {
 715                 if (metric->store.type)
 716                         free(metric->store.type);
 717                 if (metric->store.id)
 718                         free(metric->store.id);
 719                 metric->store.type = metric->store.id = NULL;
 720                 status = -1;
 721         }
 722         pthread_rwlock_unlock(&host_lock);
 723         return status;
 724 } /* sdb_store_metric */
 725
 726 int
 727 sdb_store_metric_attr(const char *hostname, const char *metric,
 728                 const char *key, const sdb_data_t *value, sdb_time_t last_update)
 729 {
 730         sdb_avltree_t *metrics;
 731         sdb_host_t *host;
 732         sdb_metric_t *m;
 733         int status = 0;
 734
 735         if ((! hostname) || (! metric) || (! key))
 736                 return -1;
 737
 738         pthread_rwlock_wrlock(&host_lock);
 739         host = lookup_host(hostname, /* canonicalize = */ 1);
 740         metrics = get_host_children(host, SDB_METRIC);
 741         sdb_object_deref(SDB_OBJ(host));
 742         if (! metrics) {
 743                 sdb_log(SDB_LOG_ERR, "store: Failed to store attribute '%s' "
 744                                 "for metric '%s' - host '%s' not found",
 745                                 key, metric, hostname);
 746                 pthread_rwlock_unlock(&host_lock);
 747                 return -1;
 748         }
 749
 750         m = METRIC(sdb_avltree_lookup(metrics, metric));
 751         if (! m) {
 752                 sdb_log(SDB_LOG_ERR, "store: Failed to store attribute '%s' - "
 753                                 "metric '%s/%s' not found", key, hostname, metric);
 754                 status = -1;
 755         }
 756
 757         if (! status)
 758                 status = store_attr(STORE_OBJ(m), m->attributes,
 759                                 key, value, last_update);
 760
 761         sdb_object_deref(SDB_OBJ(m));
 762         pthread_rwlock_unlock(&host_lock);
 763         return status;
 764 } /* sdb_store_metric_attr */
 765
 766 sdb_store_obj_t *
 767 sdb_store_get_child(sdb_store_obj_t *host, int type, const char *name)
 768 {
 769         sdb_avltree_t *children;
 770
 771         if ((! host) || (host->type != SDB_HOST) || (! name))
 772                 return NULL;
 773
 774         children = get_host_children(HOST(host), type);
 775         if (! children)
 776                 return NULL;
 777         return STORE_OBJ(sdb_avltree_lookup(children, name));
 778 } /* sdb_store_get_child */
 779
 780 int
 781 sdb_store_fetch_timeseries(const char *hostname, const char *metric,
 782                 sdb_timeseries_opts_t *opts, sdb_strbuf_t *buf)
 783 {
 784         sdb_avltree_t *metrics;
 785         sdb_host_t *host;
 786         sdb_metric_t *m;
 787
 788         sdb_timeseries_t *ts;
 789
 790         if ((! hostname) || (! metric) || (! opts) || (! buf))
 791                 return -1;
 792
 793         pthread_rwlock_rdlock(&host_lock);
 794         host = lookup_host(hostname, /* canonicalize = */ 1);
 795         metrics = get_host_children(host, SDB_METRIC);
 796         sdb_object_deref(SDB_OBJ(host));
 797         if (! metrics) {
 798                 sdb_log(SDB_LOG_ERR, "store: Failed to fetch time-series '%s/%s' "
 799                                 "- host '%s' not found", hostname, metric, hostname);
 800                 pthread_rwlock_unlock(&host_lock);
 801                 return -1;
 802         }
 803
 804         m = METRIC(sdb_avltree_lookup(metrics, metric));
 805         if (! m) {
 806                 sdb_log(SDB_LOG_ERR, "store: Failed to fetch time-series '%s/%s' "
 807                                 "- metric '%s' not found", hostname, metric, metric);
 808                 pthread_rwlock_unlock(&host_lock);
 809                 return -1;
 810         }
 811
 812         if ((! m->store.type) || (! m->store.id)) {
 813                 sdb_log(SDB_LOG_ERR, "store: Failed to fetch time-series '%s/%s' "
 814                                 "- no data-store configured for the stored metric",
 815                                 hostname, metric);
 816                 pthread_rwlock_unlock(&host_lock);
 817                 return -1;
 818         }
 819
 820         {
 821                 char type[strlen(m->store.type) + 1];
 822                 char id[strlen(m->store.id) + 1];
 823
 824                 strncpy(type, m->store.type, sizeof(type));
 825                 strncpy(id, m->store.id, sizeof(id));
 826                 pthread_rwlock_unlock(&host_lock);
 827
 828                 ts = sdb_plugin_fetch_timeseries(type, id, opts);
 829                 if (! ts) {
 830                         sdb_log(SDB_LOG_ERR, "store: Failed to fetch time-series '%s/%s' "
 831                                         "- %s fetcher callback returned no data for '%s'",
 832                                         hostname, metric, type, id);
 833                         return -1;
 834                 }
 835         }
 836
 837         ts_tojson(ts, buf);
 838         sdb_timeseries_destroy(ts);
 839         return 0;
 840 } /* sdb_store_fetch_timeseries */
 841
 842 int
 843 sdb_store_get_field(sdb_store_obj_t *obj, int field, sdb_data_t *res)
 844 {
 845         sdb_data_t tmp;
 846
 847         if (! obj)
 848                 return -1;
 849
 850         switch (field) {
 851                 case SDB_FIELD_NAME:
 852                         tmp.type = SDB_TYPE_STRING;
 853                         tmp.data.string = strdup(SDB_OBJ(obj)->name);
 854                         if (! tmp.data.string)
 855                                 return -1;
 856                         break;
 857                 case SDB_FIELD_LAST_UPDATE:
 858                         tmp.type = SDB_TYPE_DATETIME;
 859                         tmp.data.datetime = obj->last_update;
 860                         break;
 861                 case SDB_FIELD_AGE:
 862                         tmp.type = SDB_TYPE_DATETIME;
 863                         tmp.data.datetime = sdb_gettime() - obj->last_update;
 864                         break;
 865                 case SDB_FIELD_INTERVAL:
 866                         tmp.type = SDB_TYPE_DATETIME;
 867                         tmp.data.datetime = obj->interval;
 868                         break;
 869                 case SDB_FIELD_BACKEND:
 870                 {
 871                         tmp.type = SDB_TYPE_ARRAY | SDB_TYPE_STRING;
 872                         tmp.data.array.length = obj->backends_num;
 873                         tmp.data.array.values = obj->backends;
 874                         return sdb_data_copy(res, &tmp);
 875                         break;
 876                 }
 877                 default:
 878                         return -1;
 879         }
 880         if (res)
 881                 *res = tmp;
 882         else
 883                 sdb_data_free_datum(&tmp);
 884         return 0;
 885 } /* sdb_store_get_field */
 886
 887 int
 888 sdb_store_get_attr(sdb_store_obj_t *obj, const char *name, sdb_data_t *res,
 889                 sdb_store_matcher_t *filter)
 890 {
 891         sdb_avltree_t *tree = NULL;
 892         sdb_store_obj_t *attr;
 893
 894         if ((! obj) || (! name))
 895                 return -1;
 896
 897         if (obj->type == SDB_HOST)
 898                 tree = HOST(obj)->attributes;
 899         else if (obj->type == SDB_SERVICE)
 900                 tree = SVC(obj)->attributes;
 901         else if (obj->type == SDB_METRIC)
 902                 tree = METRIC(obj)->attributes;
 903
 904         if (! tree)
 905                 return -1;
 906
 907         attr = STORE_OBJ(sdb_avltree_lookup(tree, name));
 908         if (! attr)
 909                 return -1;
 910         if (filter && (! sdb_store_matcher_matches(filter, attr, NULL))) {
 911                 sdb_object_deref(SDB_OBJ(attr));
 912                 return -1;
 913         }
 914
 915         assert(STORE_OBJ(attr)->type == SDB_ATTRIBUTE);
 916         if (res)
 917                 sdb_data_copy(res, &ATTR(attr)->value);
 918         sdb_object_deref(SDB_OBJ(attr));
 919         return 0;
 920 } /* sdb_store_get_attr */
 921
 922 int
 923 sdb_store_scan(int type, sdb_store_matcher_t *m, sdb_store_matcher_t *filter,
 924                 sdb_store_lookup_cb cb, void *user_data)
 925 {
 926         sdb_avltree_iter_t *host_iter;
 927         int status = 0;
 928
 929         if (! cb)
 930                 return -1;
 931
 932         if ((type != SDB_HOST) && (type != SDB_SERVICE) && (type != SDB_METRIC)) {
 933                 sdb_log(SDB_LOG_ERR, "store: Cannot scan objects of type %d", type);
 934                 return -1;
 935         }
 936
 937         pthread_rwlock_rdlock(&host_lock);
 938
 939         host_iter = sdb_avltree_get_iter(hosts);
 940         if (! host_iter)
 941                 status = -1;
 942
 943         /* has_next returns false if the iterator is NULL */
 944         while (sdb_avltree_iter_has_next(host_iter)) {
 945                 sdb_store_obj_t *host;
 946                 sdb_avltree_iter_t *iter = NULL;
 947
 948                 host = STORE_OBJ(sdb_avltree_iter_get_next(host_iter));
 949                 assert(host);
 950
 951                 if (! sdb_store_matcher_matches(filter, host, NULL))
 952                         continue;
 953
 954                 if (type == SDB_SERVICE)
 955                         iter = sdb_avltree_get_iter(HOST(host)->services);
 956                 else if (type == SDB_METRIC)
 957                         iter = sdb_avltree_get_iter(HOST(host)->metrics);
 958
 959                 if (iter) {
 960                         while (sdb_avltree_iter_has_next(iter)) {
 961                                 sdb_store_obj_t *obj;
 962                                 obj = STORE_OBJ(sdb_avltree_iter_get_next(iter));
 963                                 assert(obj);
 964
 965                                 if (sdb_store_matcher_matches(m, obj, filter)) {
 966                                         if (cb(obj, filter, user_data)) {
 967                                                 sdb_log(SDB_LOG_ERR, "store: Callback returned "
 968                                                                 "an error while scanning");
 969                                                 status = -1;
 970                                                 break;
 971                                         }
 972                                 }
 973                         }
 974                 }
 975                 else if (sdb_store_matcher_matches(m, host, filter)) {
 976                         if (cb(host, filter, user_data)) {
 977                                 sdb_log(SDB_LOG_ERR, "store: Callback returned "
 978                                                 "an error while scanning");
 979                                 status = -1;
 980                         }
 981                 }
 982
 983                 sdb_avltree_iter_destroy(iter);
 984                 if (status)
 985                         break;
 986         }
 987
 988         sdb_avltree_iter_destroy(host_iter);
 989         pthread_rwlock_unlock(&host_lock);
 990         return status;
 991 } /* sdb_store_scan */
 992
 993 /* vim: set tw=78 sw=4 ts=4 noexpandtab : */
 994