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 <math.h>
  47 #include <pthread.h>
  48
  49 /*
  50  * private variables
  51  */
  52
  53 static sdb_avltree_t *hosts = NULL;
  54 static pthread_rwlock_t host_lock = PTHREAD_RWLOCK_INITIALIZER;
  55
  56 /*
  57  * private types
  58  */
  59
  60 static sdb_type_t sdb_host_type;
  61 static sdb_type_t sdb_service_type;
  62 static sdb_type_t sdb_metric_type;
  63 static sdb_type_t sdb_attribute_type;
  64
  65 static int
  66 store_obj_init(sdb_object_t *obj, va_list ap)
  67 {
  68         sdb_store_obj_t *sobj = STORE_OBJ(obj);
  69
  70         sobj->type = va_arg(ap, int);
  71
  72         sobj->last_update = va_arg(ap, sdb_time_t);
  73         sobj->interval = 0;
  74         sobj->backends = NULL;
  75         sobj->backends_num = 0;
  76         sobj->parent = NULL;
  77         return 0;
  78 } /* store_obj_init */
  79
  80 static void
  81 store_obj_destroy(sdb_object_t *obj)
  82 {
  83         sdb_store_obj_t *sobj = STORE_OBJ(obj);
  84         size_t i;
  85
  86         for (i = 0; i < sobj->backends_num; ++i)
  87                 free(sobj->backends[i]);
  88         free(sobj->backends);
  89         sobj->backends = NULL;
  90         sobj->backends_num = 0;
  91
  92         // We don't currently keep an extra reference for parent objects to
  93         // avoid circular self-references which are not handled correctly by
  94         // the ref-count base management layer.
  95         //sdb_object_deref(SDB_OBJ(sobj->parent));
  96 } /* store_obj_destroy */
  97
  98 static int
  99 sdb_host_init(sdb_object_t *obj, va_list ap)
 100 {
 101         sdb_host_t *sobj = HOST(obj);
 102         int ret;
 103
 104         /* this will consume the first argument (type) of ap */
 105         ret = store_obj_init(obj, ap);
 106         if (ret)
 107                 return ret;
 108
 109         sobj->services = sdb_avltree_create();
 110         if (! sobj->services)
 111                 return -1;
 112         sobj->metrics = sdb_avltree_create();
 113         if (! sobj->metrics)
 114                 return -1;
 115         sobj->attributes = sdb_avltree_create();
 116         if (! sobj->attributes)
 117                 return -1;
 118         return 0;
 119 } /* sdb_host_init */
 120
 121 static void
 122 sdb_host_destroy(sdb_object_t *obj)
 123 {
 124         sdb_host_t *sobj = HOST(obj);
 125         assert(obj);
 126
 127         store_obj_destroy(obj);
 128
 129         if (sobj->services)
 130                 sdb_avltree_destroy(sobj->services);
 131         if (sobj->metrics)
 132                 sdb_avltree_destroy(sobj->metrics);
 133         if (sobj->attributes)
 134                 sdb_avltree_destroy(sobj->attributes);
 135 } /* sdb_host_destroy */
 136
 137 static int
 138 sdb_service_init(sdb_object_t *obj, va_list ap)
 139 {
 140         sdb_service_t *sobj = SVC(obj);
 141         int ret;
 142
 143         /* this will consume the first argument (type) of ap */
 144         ret = store_obj_init(obj, ap);
 145         if (ret)
 146                 return ret;
 147
 148         sobj->attributes = sdb_avltree_create();
 149         if (! sobj->attributes)
 150                 return -1;
 151         return 0;
 152 } /* sdb_service_init */
 153
 154 static void
 155 sdb_service_destroy(sdb_object_t *obj)
 156 {
 157         sdb_service_t *sobj = SVC(obj);
 158         assert(obj);
 159
 160         store_obj_destroy(obj);
 161
 162         if (sobj->attributes)
 163                 sdb_avltree_destroy(sobj->attributes);
 164 } /* sdb_service_destroy */
 165
 166 static int
 167 sdb_metric_init(sdb_object_t *obj, va_list ap)
 168 {
 169         sdb_metric_t *sobj = METRIC(obj);
 170         int ret;
 171
 172         /* this will consume the first argument (type) of ap */
 173         ret = store_obj_init(obj, ap);
 174         if (ret)
 175                 return ret;
 176
 177         sobj->attributes = sdb_avltree_create();
 178         if (! sobj->attributes)
 179                 return -1;
 180
 181         sobj->store.type = sobj->store.id = NULL;
 182         return 0;
 183 } /* sdb_metric_init */
 184
 185 static void
 186 sdb_metric_destroy(sdb_object_t *obj)
 187 {
 188         sdb_metric_t *sobj = METRIC(obj);
 189         assert(obj);
 190
 191         store_obj_destroy(obj);
 192
 193         if (sobj->attributes)
 194                 sdb_avltree_destroy(sobj->attributes);
 195
 196         if (sobj->store.type)
 197                 free(sobj->store.type);
 198         if (sobj->store.id)
 199                 free(sobj->store.id);
 200 } /* sdb_metric_destroy */
 201
 202 static int
 203 sdb_attr_init(sdb_object_t *obj, va_list ap)
 204 {
 205         const sdb_data_t *value;
 206         int ret;
 207
 208         /* this will consume the first two arguments
 209          * (type and last_update) of ap */
 210         ret = store_obj_init(obj, ap);
 211         if (ret)
 212                 return ret;
 213         value = va_arg(ap, const sdb_data_t *);
 214
 215         if (value)
 216                 if (sdb_data_copy(&ATTR(obj)->value, value))
 217                         return -1;
 218         return 0;
 219 } /* sdb_attr_init */
 220
 221 static void
 222 sdb_attr_destroy(sdb_object_t *obj)
 223 {
 224         assert(obj);
 225
 226         store_obj_destroy(obj);
 227         sdb_data_free_datum(&ATTR(obj)->value);
 228 } /* sdb_attr_destroy */
 229
 230 static sdb_type_t sdb_host_type = {
 231         sizeof(sdb_host_t),
 232         sdb_host_init,
 233         sdb_host_destroy
 234 };
 235
 236 static sdb_type_t sdb_service_type = {
 237         sizeof(sdb_service_t),
 238         sdb_service_init,
 239         sdb_service_destroy
 240 };
 241
 242 static sdb_type_t sdb_metric_type = {
 243         sizeof(sdb_metric_t),
 244         sdb_metric_init,
 245         sdb_metric_destroy
 246 };
 247
 248 static sdb_type_t sdb_attribute_type = {
 249         sizeof(sdb_attribute_t),
 250         sdb_attr_init,
 251         sdb_attr_destroy
 252 };
 253
 254 /*
 255  * private helper functions
 256  */
 257
 258 static sdb_host_t *
 259 lookup_host(const char *name, _Bool canonicalize)
 260 {
 261         sdb_host_t *host;
 262         char *cname;
 263
 264         assert(name);
 265         if (! canonicalize)
 266                 return HOST(sdb_avltree_lookup(hosts, name));
 267
 268         cname = strdup(name);
 269         cname = sdb_plugin_cname(cname);
 270         if (! cname) {
 271                 sdb_log(SDB_LOG_ERR, "store: strdup failed");
 272                 return NULL;
 273         }
 274
 275         host = HOST(sdb_avltree_lookup(hosts, cname));
 276         free(cname);
 277         return host;
 278 } /* lookup_host */
 279
 280 static int
 281 record_backend(sdb_store_obj_t *obj)
 282 {
 283         const sdb_plugin_info_t *info;
 284         char **tmp;
 285         size_t i;
 286
 287         info = sdb_plugin_current();
 288         if (! info)
 289                 return 0;
 290
 291         for (i = 0; i < obj->backends_num; ++i)
 292                 if (!strcasecmp(obj->backends[i], info->plugin_name))
 293                         return 0;
 294
 295         tmp = realloc(obj->backends,
 296                         (obj->backends_num + 1) * sizeof(*obj->backends));
 297         if (! tmp)
 298                 return -1;
 299
 300         obj->backends = tmp;
 301         obj->backends[obj->backends_num] = strdup(info->plugin_name);
 302         if (! obj->backends[obj->backends_num])
 303                 return -1;
 304
 305         ++obj->backends_num;
 306         return 0;
 307 } /* record_backend */
 308
 309 static int
 310 store_obj(sdb_store_obj_t *parent, sdb_avltree_t *parent_tree,
 311                 int type, const char *name, sdb_time_t last_update,
 312                 sdb_store_obj_t **updated_obj)
 313 {
 314         sdb_store_obj_t *old, *new;
 315         int status = 0;
 316
 317         assert(parent_tree);
 318
 319         if (last_update <= 0)
 320                 last_update = sdb_gettime();
 321
 322         old = STORE_OBJ(sdb_avltree_lookup(parent_tree, name));
 323         if (old) {
 324                 if (old->last_update > last_update) {
 325                         sdb_log(SDB_LOG_DEBUG, "store: Cannot update %s '%s' - "
 326                                         "value too old (%"PRIsdbTIME" < %"PRIsdbTIME")",
 327                                         SDB_STORE_TYPE_TO_NAME(type), name,
 328                                         last_update, old->last_update);
 329                         /* don't report an error; the object may be updated by multiple
 330                          * backends */
 331                         status = 1;
 332                 }
 333                 else if (old->last_update == last_update) {
 334                         /* don't report an error and also don't even log this to avoid
 335                          * excessive noise on high sampling frequencies */
 336                         status = 1;
 337                 }
 338                 else {
 339                         sdb_time_t interval = last_update - old->last_update;
 340                         old->last_update = last_update;
 341                         if (interval) {
 342                                 if (old->interval)
 343                                         old->interval = (sdb_time_t)((0.9 * (double)old->interval)
 344                                                         + (0.1 * (double)interval));
 345                                 else
 346                                         old->interval = interval;
 347                         }
 348                 }
 349
 350                 new = old;
 351                 sdb_object_deref(SDB_OBJ(old));
 352         }
 353         else {
 354                 if (type == SDB_ATTRIBUTE) {
 355                         /* the value will be updated by the caller */
 356                         new = STORE_OBJ(sdb_object_create(name, sdb_attribute_type,
 357                                                 type, last_update, NULL));
 358                 }
 359                 else {
 360                         sdb_type_t t;
 361                         t = type == SDB_HOST
 362                                 ? sdb_host_type
 363                                 : type == SDB_SERVICE
 364                                         ? sdb_service_type
 365                                         : sdb_metric_type;
 366                         new = STORE_OBJ(sdb_object_create(name, t, type, last_update));
 367                 }
 368
 369                 if (new) {
 370                         status = sdb_avltree_insert(parent_tree, SDB_OBJ(new));
 371
 372                         /* pass control to the tree or destroy in case of an error */
 373                         sdb_object_deref(SDB_OBJ(new));
 374                 }
 375                 else {
 376                         char errbuf[1024];
 377                         sdb_log(SDB_LOG_ERR, "store: Failed to create %s '%s': %s",
 378                                         SDB_STORE_TYPE_TO_NAME(type), name,
 379                                         sdb_strerror(errno, errbuf, sizeof(errbuf)));
 380                         status = -1;
 381                 }
 382         }
 383
 384         if (status < 0)
 385                 return status;
 386         assert(new);
 387
 388         if (new->parent != parent) {
 389                 // Avoid circular self-references which are not handled
 390                 // correctly by the ref-count based management layer.
 391                 //sdb_object_deref(SDB_OBJ(new->parent));
 392                 //sdb_object_ref(SDB_OBJ(parent));
 393                 new->parent = parent;
 394         }
 395
 396         if (updated_obj)
 397                 *updated_obj = new;
 398
 399         if (record_backend(new))
 400                 return -1;
 401         return status;
 402 } /* store_obj */
 403
 404 static int
 405 store_attr(sdb_store_obj_t *parent, sdb_avltree_t *attributes,
 406                 const char *key, const sdb_data_t *value, sdb_time_t last_update)
 407 {
 408         sdb_store_obj_t *attr = NULL;
 409         int status;
 410
 411         status = store_obj(parent, attributes, SDB_ATTRIBUTE,
 412                         key, last_update, &attr);
 413         if (status)
 414                 return status;
 415
 416         /* don't update unchanged values */
 417         if (! sdb_data_cmp(&ATTR(attr)->value, value))
 418                 return status;
 419
 420         assert(attr);
 421         if (sdb_data_copy(&ATTR(attr)->value, value))
 422                 return -1;
 423         return status;
 424 } /* store_attr */
 425
 426 /* The host_lock has to be acquired before calling this function. */
 427 static sdb_avltree_t *
 428 get_host_children(sdb_host_t *host, int type)
 429 {
 430         if ((type != SDB_SERVICE) && (type != SDB_METRIC)
 431                         && (type != SDB_ATTRIBUTE))
 432                 return NULL;
 433
 434         if (! host)
 435                 return NULL;
 436
 437         if (type == SDB_ATTRIBUTE)
 438                 return host->attributes;
 439         else if (type == SDB_METRIC)
 440                 return host->metrics;
 441         else
 442                 return host->services;
 443 } /* get_host_children */
 444
 445 /*
 446  * ts_tojson serializes a time-series to JSON.
 447  *
 448  * The function never returns an error. Rather, an error message will be part
 449  * of the serialized data.
 450  */
 451 static void
 452 ts_tojson(sdb_timeseries_t *ts, sdb_strbuf_t *buf)
 453 {
 454         char start_str[64];
 455         char end_str[64];
 456
 457         size_t i;
 458
 459         /* TODO: make time format configurable */
 460         if (! sdb_strftime(start_str, sizeof(start_str),
 461                                 "%F %T %z", ts->start))
 462                 snprintf(start_str, sizeof(start_str), "<error>");
 463         start_str[sizeof(start_str) - 1] = '\0';
 464         if (! sdb_strftime(end_str, sizeof(end_str),
 465                                 "%F %T %z", ts->end))
 466                 snprintf(end_str, sizeof(end_str), "<error>");
 467         end_str[sizeof(end_str) - 1] = '\0';
 468
 469         sdb_strbuf_append(buf, "{\"start\": \"%s\", \"end\": \"%s\", \"data\": {",
 470                         start_str, end_str);
 471
 472         for (i = 0; i < ts->data_names_len; ++i) {
 473                 size_t j;
 474                 sdb_strbuf_append(buf, "\"%s\": [", ts->data_names[i]);
 475
 476                 for (j = 0; j < ts->data_len; ++j) {
 477                         char time_str[64];
 478
 479                         if (! sdb_strftime(time_str, sizeof(time_str),
 480                                                 "%F %T %z", ts->data[i][j].timestamp))
 481                                 snprintf(time_str, sizeof(time_str), "<error>");
 482                         time_str[sizeof(time_str) - 1] = '\0';
 483
 484                         /* Some GNU libc versions may print '-nan' which we dont' want */
 485                         if (isnan(ts->data[i][j].value))
 486                                 sdb_strbuf_append(buf, "{\"timestamp\": \"%s\", "
 487                                                 "\"value\": \"nan\"}", time_str);
 488                         else
 489                                 sdb_strbuf_append(buf, "{\"timestamp\": \"%s\", "
 490                                                 "\"value\": \"%f\"}", time_str, ts->data[i][j].value);
 491
 492                         if (j < ts->data_len - 1)
 493                                 sdb_strbuf_append(buf, ",");
 494                 }
 495
 496                 if (i < ts->data_names_len - 1)
 497                         sdb_strbuf_append(buf, "],");
 498                 else
 499                         sdb_strbuf_append(buf, "]");
 500         }
 501         sdb_strbuf_append(buf, "}}");
 502 } /* ts_tojson */
 503
 504 /*
 505  * public API
 506  */
 507
 508 void
 509 sdb_store_clear(void)
 510 {
 511         sdb_avltree_destroy(hosts);
 512         hosts = NULL;
 513 } /* sdb_store_clear */
 514
 515 int
 516 sdb_store_host(const char *name, sdb_time_t last_update)
 517 {
 518         char *cname = NULL;
 519         int status = 0;
 520
 521         if (! name)
 522                 return -1;
 523
 524         cname = sdb_plugin_cname(strdup(name));
 525         if (! cname) {
 526                 sdb_log(SDB_LOG_ERR, "store: strdup failed");
 527                 return -1;
 528         }
 529
 530         pthread_rwlock_wrlock(&host_lock);
 531         if (! hosts)
 532                 if (! (hosts = sdb_avltree_create()))
 533                         status = -1;
 534
 535         if (! status)
 536                 status = store_obj(NULL, hosts, SDB_HOST, cname, last_update, NULL);
 537         pthread_rwlock_unlock(&host_lock);
 538
 539         free(cname);
 540         return status;
 541 } /* sdb_store_host */
 542
 543 _Bool
 544 sdb_store_has_host(const char *name)
 545 {
 546         sdb_host_t *host;
 547
 548         if (! name)
 549                 return NULL;
 550
 551         host = lookup_host(name, /* canonicalize = */ 0);
 552         sdb_object_deref(SDB_OBJ(host));
 553         return host != NULL;
 554 } /* sdb_store_has_host */
 555
 556 sdb_store_obj_t *
 557 sdb_store_get_host(const char *name)
 558 {
 559         sdb_host_t *host;
 560
 561         if (! name)
 562                 return NULL;
 563
 564         host = lookup_host(name, /* canonicalize = */ 0);
 565         if (! host)
 566                 return NULL;
 567
 568         return STORE_OBJ(host);
 569 } /* sdb_store_get_host */
 570
 571 int
 572 sdb_store_attribute(const char *hostname,
 573                 const char *key, const sdb_data_t *value,
 574                 sdb_time_t last_update)
 575 {
 576         sdb_host_t *host;
 577         sdb_avltree_t *attrs;
 578         int status = 0;
 579
 580         if ((! hostname) || (! key))
 581                 return -1;
 582
 583         pthread_rwlock_wrlock(&host_lock);
 584         host = lookup_host(hostname, /* canonicalize = */ 1);
 585         attrs = get_host_children(host, SDB_ATTRIBUTE);
 586         if (! attrs) {
 587                 sdb_log(SDB_LOG_ERR, "store: Failed to store attribute '%s' - "
 588                                 "host '%s' not found", key, hostname);
 589                 status = -1;
 590         }
 591
 592         if (! status)
 593                 status = store_attr(STORE_OBJ(host), attrs, key, value, last_update);
 594
 595         sdb_object_deref(SDB_OBJ(host));
 596         pthread_rwlock_unlock(&host_lock);
 597         return status;
 598 } /* sdb_store_attribute */
 599
 600 int
 601 sdb_store_service(const char *hostname, const char *name,
 602                 sdb_time_t last_update)
 603 {
 604         sdb_host_t *host;
 605         sdb_avltree_t *services;
 606
 607         int status = 0;
 608
 609         if ((! hostname) || (! name))
 610                 return -1;
 611
 612         pthread_rwlock_wrlock(&host_lock);
 613         host = lookup_host(hostname, /* canonicalize = */ 1);
 614         services = get_host_children(host, SDB_SERVICE);
 615         if (! services) {
 616                 sdb_log(SDB_LOG_ERR, "store: Failed to store service '%s' - "
 617                                 "host '%s' not found", name, hostname);
 618                 status = -1;
 619         }
 620
 621         if (! status)
 622                 status = store_obj(STORE_OBJ(host), services, SDB_SERVICE,
 623                                 name, last_update, NULL);
 624
 625         sdb_object_deref(SDB_OBJ(host));
 626         pthread_rwlock_unlock(&host_lock);
 627         return status;
 628 } /* sdb_store_service */
 629
 630 int
 631 sdb_store_service_attr(const char *hostname, const char *service,
 632                 const char *key, const sdb_data_t *value, sdb_time_t last_update)
 633 {
 634         sdb_host_t *host;
 635         sdb_service_t *svc;
 636         sdb_avltree_t *services;
 637         int status = 0;
 638
 639         if ((! hostname) || (! service) || (! key))
 640                 return -1;
 641
 642         pthread_rwlock_wrlock(&host_lock);
 643         host = lookup_host(hostname, /* canonicalize = */ 1);
 644         services = get_host_children(host, SDB_SERVICE);
 645         sdb_object_deref(SDB_OBJ(host));
 646         if (! services) {
 647                 sdb_log(SDB_LOG_ERR, "store: Failed to store attribute '%s' "
 648                                 "for service '%s' - host '%ss' not found",
 649                                 key, service, hostname);
 650                 pthread_rwlock_unlock(&host_lock);
 651                 return -1;
 652         }
 653
 654         svc = SVC(sdb_avltree_lookup(services, service));
 655         if (! svc) {
 656                 sdb_log(SDB_LOG_ERR, "store: Failed to store attribute '%s' - "
 657                                 "service '%s/%s' not found", key, hostname, service);
 658                 status = -1;
 659         }
 660
 661         if (! status)
 662                 status = store_attr(STORE_OBJ(svc), svc->attributes,
 663                                 key, value, last_update);
 664
 665         sdb_object_deref(SDB_OBJ(svc));
 666         pthread_rwlock_unlock(&host_lock);
 667         return status;
 668 } /* sdb_store_service_attr */
 669
 670 int
 671 sdb_store_metric(const char *hostname, const char *name,
 672                 sdb_metric_store_t *store, sdb_time_t last_update)
 673 {
 674         sdb_store_obj_t *obj = NULL;
 675         sdb_host_t *host;
 676         sdb_metric_t *metric;
 677
 678         sdb_avltree_t *metrics;
 679
 680         int status = 0;
 681
 682         if ((! hostname) || (! name))
 683                 return -1;
 684         if (store && ((! store->type) || (! store->id)))
 685                 return -1;
 686
 687         pthread_rwlock_wrlock(&host_lock);
 688         host = lookup_host(hostname, /* canonicalize = */ 1);
 689         metrics = get_host_children(host, SDB_METRIC);
 690         if (! metrics) {
 691                 sdb_log(SDB_LOG_ERR, "store: Failed to store metric '%s' - "
 692                                 "host '%s' not found", name, hostname);
 693                 status = -1;
 694         }
 695
 696         if (! status)
 697                 status = store_obj(STORE_OBJ(host), metrics, SDB_METRIC,
 698                                 name, last_update, &obj);
 699         sdb_object_deref(SDB_OBJ(host));
 700
 701         if (status || (! store)) {
 702                 pthread_rwlock_unlock(&host_lock);
 703                 return status;
 704         }
 705
 706         assert(obj);
 707         metric = METRIC(obj);
 708
 709         if ((! metric->store.type) || strcasecmp(metric->store.type, store->type)) {
 710                 if (metric->store.type)
 711                         free(metric->store.type);
 712                 metric->store.type = strdup(store->type);
 713         }
 714         if ((! metric->store.id) || strcasecmp(metric->store.id, store->id)) {
 715                 if (metric->store.id)
 716                         free(metric->store.id);
 717                 metric->store.id = strdup(store->id);
 718         }
 719
 720         if ((! metric->store.type) || (! metric->store.id)) {
 721                 if (metric->store.type)
 722                         free(metric->store.type);
 723                 if (metric->store.id)
 724                         free(metric->store.id);
 725                 metric->store.type = metric->store.id = NULL;
 726                 status = -1;
 727         }
 728         pthread_rwlock_unlock(&host_lock);
 729         return status;
 730 } /* sdb_store_metric */
 731
 732 int
 733 sdb_store_metric_attr(const char *hostname, const char *metric,
 734                 const char *key, const sdb_data_t *value, sdb_time_t last_update)
 735 {
 736         sdb_avltree_t *metrics;
 737         sdb_host_t *host;
 738         sdb_metric_t *m;
 739         int status = 0;
 740
 741         if ((! hostname) || (! metric) || (! key))
 742                 return -1;
 743
 744         pthread_rwlock_wrlock(&host_lock);
 745         host = lookup_host(hostname, /* canonicalize = */ 1);
 746         metrics = get_host_children(host, SDB_METRIC);
 747         sdb_object_deref(SDB_OBJ(host));
 748         if (! metrics) {
 749                 sdb_log(SDB_LOG_ERR, "store: Failed to store attribute '%s' "
 750                                 "for metric '%s' - host '%s' not found",
 751                                 key, metric, hostname);
 752                 pthread_rwlock_unlock(&host_lock);
 753                 return -1;
 754         }
 755
 756         m = METRIC(sdb_avltree_lookup(metrics, metric));
 757         if (! m) {
 758                 sdb_log(SDB_LOG_ERR, "store: Failed to store attribute '%s' - "
 759                                 "metric '%s/%s' not found", key, hostname, metric);
 760                 status = -1;
 761         }
 762
 763         if (! status)
 764                 status = store_attr(STORE_OBJ(m), m->attributes,
 765                                 key, value, last_update);
 766
 767         sdb_object_deref(SDB_OBJ(m));
 768         pthread_rwlock_unlock(&host_lock);
 769         return status;
 770 } /* sdb_store_metric_attr */
 771
 772 sdb_store_obj_t *
 773 sdb_store_get_child(sdb_store_obj_t *host, int type, const char *name)
 774 {
 775         sdb_avltree_t *children;
 776
 777         if ((! host) || (host->type != SDB_HOST) || (! name))
 778                 return NULL;
 779
 780         children = get_host_children(HOST(host), type);
 781         if (! children)
 782                 return NULL;
 783         return STORE_OBJ(sdb_avltree_lookup(children, name));
 784 } /* sdb_store_get_child */
 785
 786 int
 787 sdb_store_fetch_timeseries(const char *hostname, const char *metric,
 788                 sdb_timeseries_opts_t *opts, sdb_strbuf_t *buf)
 789 {
 790         sdb_avltree_t *metrics;
 791         sdb_host_t *host;
 792         sdb_metric_t *m;
 793
 794         sdb_timeseries_t *ts;
 795
 796         if ((! hostname) || (! metric) || (! opts) || (! buf))
 797                 return -1;
 798
 799         pthread_rwlock_rdlock(&host_lock);
 800         host = lookup_host(hostname, /* canonicalize = */ 1);
 801         metrics = get_host_children(host, SDB_METRIC);
 802         sdb_object_deref(SDB_OBJ(host));
 803         if (! metrics) {
 804                 sdb_log(SDB_LOG_ERR, "store: Failed to fetch time-series '%s/%s' "
 805                                 "- host '%s' not found", hostname, metric, hostname);
 806                 pthread_rwlock_unlock(&host_lock);
 807                 return -1;
 808         }
 809
 810         m = METRIC(sdb_avltree_lookup(metrics, metric));
 811         if (! m) {
 812                 sdb_log(SDB_LOG_ERR, "store: Failed to fetch time-series '%s/%s' "
 813                                 "- metric '%s' not found", hostname, metric, metric);
 814                 pthread_rwlock_unlock(&host_lock);
 815                 return -1;
 816         }
 817
 818         if ((! m->store.type) || (! m->store.id)) {
 819                 sdb_log(SDB_LOG_ERR, "store: Failed to fetch time-series '%s/%s' "
 820                                 "- no data-store configured for the stored metric",
 821                                 hostname, metric);
 822                 pthread_rwlock_unlock(&host_lock);
 823                 return -1;
 824         }
 825
 826         {
 827                 char type[strlen(m->store.type) + 1];
 828                 char id[strlen(m->store.id) + 1];
 829
 830                 strncpy(type, m->store.type, sizeof(type));
 831                 strncpy(id, m->store.id, sizeof(id));
 832                 pthread_rwlock_unlock(&host_lock);
 833
 834                 ts = sdb_plugin_fetch_timeseries(type, id, opts);
 835                 if (! ts) {
 836                         sdb_log(SDB_LOG_ERR, "store: Failed to fetch time-series '%s/%s' "
 837                                         "- %s fetcher callback returned no data for '%s'",
 838                                         hostname, metric, type, id);
 839                         return -1;
 840                 }
 841         }
 842
 843         ts_tojson(ts, buf);
 844         sdb_timeseries_destroy(ts);
 845         return 0;
 846 } /* sdb_store_fetch_timeseries */
 847
 848 int
 849 sdb_store_get_field(sdb_store_obj_t *obj, int field, sdb_data_t *res)
 850 {
 851         sdb_data_t tmp;
 852
 853         if (! obj)
 854                 return -1;
 855
 856         switch (field) {
 857                 case SDB_FIELD_NAME:
 858                         tmp.type = SDB_TYPE_STRING;
 859                         tmp.data.string = strdup(SDB_OBJ(obj)->name);
 860                         if (! tmp.data.string)
 861                                 return -1;
 862                         break;
 863                 case SDB_FIELD_LAST_UPDATE:
 864                         tmp.type = SDB_TYPE_DATETIME;
 865                         tmp.data.datetime = obj->last_update;
 866                         break;
 867                 case SDB_FIELD_AGE:
 868                         tmp.type = SDB_TYPE_DATETIME;
 869                         tmp.data.datetime = sdb_gettime() - obj->last_update;
 870                         break;
 871                 case SDB_FIELD_INTERVAL:
 872                         tmp.type = SDB_TYPE_DATETIME;
 873                         tmp.data.datetime = obj->interval;
 874                         break;
 875                 case SDB_FIELD_BACKEND:
 876                 {
 877                         tmp.type = SDB_TYPE_ARRAY | SDB_TYPE_STRING;
 878                         tmp.data.array.length = obj->backends_num;
 879                         tmp.data.array.values = obj->backends;
 880                         return sdb_data_copy(res, &tmp);
 881                 }
 882                 default:
 883                         return -1;
 884         }
 885         if (res)
 886                 *res = tmp;
 887         else
 888                 sdb_data_free_datum(&tmp);
 889         return 0;
 890 } /* sdb_store_get_field */
 891
 892 int
 893 sdb_store_get_attr(sdb_store_obj_t *obj, const char *name, sdb_data_t *res,
 894                 sdb_store_matcher_t *filter)
 895 {
 896         sdb_avltree_t *tree = NULL;
 897         sdb_store_obj_t *attr;
 898
 899         if ((! obj) || (! name))
 900                 return -1;
 901
 902         if (obj->type == SDB_HOST)
 903                 tree = HOST(obj)->attributes;
 904         else if (obj->type == SDB_SERVICE)
 905                 tree = SVC(obj)->attributes;
 906         else if (obj->type == SDB_METRIC)
 907                 tree = METRIC(obj)->attributes;
 908
 909         if (! tree)
 910                 return -1;
 911
 912         attr = STORE_OBJ(sdb_avltree_lookup(tree, name));
 913         if (! attr)
 914                 return -1;
 915         if (filter && (! sdb_store_matcher_matches(filter, attr, NULL))) {
 916                 sdb_object_deref(SDB_OBJ(attr));
 917                 return -1;
 918         }
 919
 920         assert(STORE_OBJ(attr)->type == SDB_ATTRIBUTE);
 921         if (res)
 922                 sdb_data_copy(res, &ATTR(attr)->value);
 923         sdb_object_deref(SDB_OBJ(attr));
 924         return 0;
 925 } /* sdb_store_get_attr */
 926
 927 int
 928 sdb_store_scan(int type, sdb_store_matcher_t *m, sdb_store_matcher_t *filter,
 929                 sdb_store_lookup_cb cb, void *user_data)
 930 {
 931         sdb_avltree_iter_t *host_iter;
 932         int status = 0;
 933
 934         if (! cb)
 935                 return -1;
 936
 937         if ((type != SDB_HOST) && (type != SDB_SERVICE) && (type != SDB_METRIC)) {
 938                 sdb_log(SDB_LOG_ERR, "store: Cannot scan objects of type %d", type);
 939                 return -1;
 940         }
 941
 942         pthread_rwlock_rdlock(&host_lock);
 943
 944         host_iter = sdb_avltree_get_iter(hosts);
 945         if (! host_iter)
 946                 status = -1;
 947
 948         /* has_next returns false if the iterator is NULL */
 949         while (sdb_avltree_iter_has_next(host_iter)) {
 950                 sdb_store_obj_t *host;
 951                 sdb_avltree_iter_t *iter = NULL;
 952
 953                 host = STORE_OBJ(sdb_avltree_iter_get_next(host_iter));
 954                 assert(host);
 955
 956                 if (! sdb_store_matcher_matches(filter, host, NULL))
 957                         continue;
 958
 959                 if (type == SDB_SERVICE)
 960                         iter = sdb_avltree_get_iter(HOST(host)->services);
 961                 else if (type == SDB_METRIC)
 962                         iter = sdb_avltree_get_iter(HOST(host)->metrics);
 963
 964                 if (iter) {
 965                         while (sdb_avltree_iter_has_next(iter)) {
 966                                 sdb_store_obj_t *obj;
 967                                 obj = STORE_OBJ(sdb_avltree_iter_get_next(iter));
 968                                 assert(obj);
 969
 970                                 if (sdb_store_matcher_matches(m, obj, filter)) {
 971                                         if (cb(obj, filter, user_data)) {
 972                                                 sdb_log(SDB_LOG_ERR, "store: Callback returned "
 973                                                                 "an error while scanning");
 974                                                 status = -1;
 975                                                 break;
 976                                         }
 977                                 }
 978                         }
 979                 }
 980                 else if (sdb_store_matcher_matches(m, host, filter)) {
 981                         if (cb(host, filter, user_data)) {
 982                                 sdb_log(SDB_LOG_ERR, "store: Callback returned "
 983                                                 "an error while scanning");
 984                                 status = -1;
 985                         }
 986                 }
 987
 988                 sdb_avltree_iter_destroy(iter);
 989                 if (status)
 990                         break;
 991         }
 992
 993         sdb_avltree_iter_destroy(host_iter);
 994         pthread_rwlock_unlock(&host_lock);
 995         return status;
 996 } /* sdb_store_scan */
 997
 998 /* vim: set tw=78 sw=4 ts=4 noexpandtab : */
 999