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 struct sdb_store {
  54         sdb_object_t super;
  55
  56         /* hosts are the top-level entries and
  57          * reference everything else */
  58         sdb_avltree_t *hosts;
  59         pthread_rwlock_t host_lock;
  60 };
  61
  62 /*
  63  * private types
  64  */
  65
  66 static sdb_type_t host_type;
  67 static sdb_type_t service_type;
  68 static sdb_type_t metric_type;
  69 static sdb_type_t attribute_type;
  70
  71 static int
  72 store_init(sdb_object_t *obj, va_list __attribute__((unused)) ap)
  73 {
  74         int err;
  75         if (! (SDB_STORE(obj)->hosts = sdb_avltree_create()))
  76                 return -1;
  77         if ((err = pthread_rwlock_init(&SDB_STORE(obj)->host_lock,
  78                                         /* attr = */ NULL))) {
  79                 char errbuf[128];
  80                 sdb_log(SDB_LOG_ERR, "store: Failed to initialize lock: %s",
  81                                 sdb_strerror(err, errbuf, sizeof(errbuf)));
  82                 return -1;
  83         }
  84         return 0;
  85 } /* store_init */
  86
  87 static void
  88 store_destroy(sdb_object_t *obj)
  89 {
  90         int err;
  91         if ((err = pthread_rwlock_destroy(&SDB_STORE(obj)->host_lock))) {
  92                 char errbuf[128];
  93                 sdb_log(SDB_LOG_ERR, "store: Failed to destroy lock: %s",
  94                                 sdb_strerror(err, errbuf, sizeof(errbuf)));
  95                 return;
  96         }
  97         sdb_avltree_destroy(SDB_STORE(obj)->hosts);
  98         SDB_STORE(obj)->hosts = NULL;
  99 } /* store_destroy */
 100
 101 static int
 102 store_obj_init(sdb_object_t *obj, va_list ap)
 103 {
 104         sdb_store_obj_t *sobj = STORE_OBJ(obj);
 105
 106         sobj->type = va_arg(ap, int);
 107
 108         sobj->last_update = va_arg(ap, sdb_time_t);
 109         sobj->interval = 0;
 110         sobj->backends = NULL;
 111         sobj->backends_num = 0;
 112         sobj->parent = NULL;
 113         return 0;
 114 } /* store_obj_init */
 115
 116 static void
 117 store_obj_destroy(sdb_object_t *obj)
 118 {
 119         sdb_store_obj_t *sobj = STORE_OBJ(obj);
 120         size_t i;
 121
 122         for (i = 0; i < sobj->backends_num; ++i)
 123                 free(sobj->backends[i]);
 124         free(sobj->backends);
 125         sobj->backends = NULL;
 126         sobj->backends_num = 0;
 127
 128         // We don't currently keep an extra reference for parent objects to
 129         // avoid circular self-references which are not handled correctly by
 130         // the ref-count base management layer.
 131         //sdb_object_deref(SDB_OBJ(sobj->parent));
 132 } /* store_obj_destroy */
 133
 134 static int
 135 host_init(sdb_object_t *obj, va_list ap)
 136 {
 137         sdb_host_t *sobj = HOST(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->services = sdb_avltree_create();
 146         if (! sobj->services)
 147                 return -1;
 148         sobj->metrics = sdb_avltree_create();
 149         if (! sobj->metrics)
 150                 return -1;
 151         sobj->attributes = sdb_avltree_create();
 152         if (! sobj->attributes)
 153                 return -1;
 154         return 0;
 155 } /* host_init */
 156
 157 static void
 158 host_destroy(sdb_object_t *obj)
 159 {
 160         sdb_host_t *sobj = HOST(obj);
 161         assert(obj);
 162
 163         store_obj_destroy(obj);
 164
 165         if (sobj->services)
 166                 sdb_avltree_destroy(sobj->services);
 167         if (sobj->metrics)
 168                 sdb_avltree_destroy(sobj->metrics);
 169         if (sobj->attributes)
 170                 sdb_avltree_destroy(sobj->attributes);
 171 } /* host_destroy */
 172
 173 static int
 174 service_init(sdb_object_t *obj, va_list ap)
 175 {
 176         sdb_service_t *sobj = SVC(obj);
 177         int ret;
 178
 179         /* this will consume the first argument (type) of ap */
 180         ret = store_obj_init(obj, ap);
 181         if (ret)
 182                 return ret;
 183
 184         sobj->attributes = sdb_avltree_create();
 185         if (! sobj->attributes)
 186                 return -1;
 187         return 0;
 188 } /* service_init */
 189
 190 static void
 191 service_destroy(sdb_object_t *obj)
 192 {
 193         sdb_service_t *sobj = SVC(obj);
 194         assert(obj);
 195
 196         store_obj_destroy(obj);
 197
 198         if (sobj->attributes)
 199                 sdb_avltree_destroy(sobj->attributes);
 200 } /* service_destroy */
 201
 202 static int
 203 metric_init(sdb_object_t *obj, va_list ap)
 204 {
 205         sdb_metric_t *sobj = METRIC(obj);
 206         int ret;
 207
 208         /* this will consume the first argument (type) of ap */
 209         ret = store_obj_init(obj, ap);
 210         if (ret)
 211                 return ret;
 212
 213         sobj->attributes = sdb_avltree_create();
 214         if (! sobj->attributes)
 215                 return -1;
 216
 217         sobj->store.type = sobj->store.id = NULL;
 218         return 0;
 219 } /* metric_init */
 220
 221 static void
 222 metric_destroy(sdb_object_t *obj)
 223 {
 224         sdb_metric_t *sobj = METRIC(obj);
 225         assert(obj);
 226
 227         store_obj_destroy(obj);
 228
 229         if (sobj->attributes)
 230                 sdb_avltree_destroy(sobj->attributes);
 231
 232         if (sobj->store.type)
 233                 free(sobj->store.type);
 234         if (sobj->store.id)
 235                 free(sobj->store.id);
 236 } /* metric_destroy */
 237
 238 static int
 239 attr_init(sdb_object_t *obj, va_list ap)
 240 {
 241         const sdb_data_t *value;
 242         int ret;
 243
 244         /* this will consume the first two arguments
 245          * (type and last_update) of ap */
 246         ret = store_obj_init(obj, ap);
 247         if (ret)
 248                 return ret;
 249         value = va_arg(ap, const sdb_data_t *);
 250
 251         if (value)
 252                 if (sdb_data_copy(&ATTR(obj)->value, value))
 253                         return -1;
 254         return 0;
 255 } /* attr_init */
 256
 257 static void
 258 attr_destroy(sdb_object_t *obj)
 259 {
 260         assert(obj);
 261
 262         store_obj_destroy(obj);
 263         sdb_data_free_datum(&ATTR(obj)->value);
 264 } /* attr_destroy */
 265
 266 static sdb_type_t store_type = {
 267         /* size = */ sizeof(sdb_store_t),
 268         /* init = */ store_init,
 269         /* destroy = */ store_destroy,
 270 };
 271
 272 static sdb_type_t host_type = {
 273         /* size = */ sizeof(sdb_host_t),
 274         /* init = */ host_init,
 275         /* destroy = */ host_destroy
 276 };
 277
 278 static sdb_type_t service_type = {
 279         /* size = */ sizeof(sdb_service_t),
 280         /* init = */ service_init,
 281         /* destroy = */ service_destroy
 282 };
 283
 284 static sdb_type_t metric_type = {
 285         /* size = */ sizeof(sdb_metric_t),
 286         /* init = */ metric_init,
 287         /* destroy = */ metric_destroy
 288 };
 289
 290 static sdb_type_t attribute_type = {
 291         /* size = */ sizeof(sdb_attribute_t),
 292         /* init = */ attr_init,
 293         /* destroy = */ attr_destroy
 294 };
 295
 296 /*
 297  * private helper functions
 298  */
 299
 300 static int
 301 record_backend(sdb_store_obj_t *obj)
 302 {
 303         const sdb_plugin_info_t *info;
 304         char **tmp;
 305         size_t i;
 306
 307         info = sdb_plugin_current();
 308         if (! info)
 309                 return 0;
 310
 311         for (i = 0; i < obj->backends_num; ++i)
 312                 if (!strcasecmp(obj->backends[i], info->plugin_name))
 313                         return 0;
 314
 315         tmp = realloc(obj->backends,
 316                         (obj->backends_num + 1) * sizeof(*obj->backends));
 317         if (! tmp)
 318                 return -1;
 319
 320         obj->backends = tmp;
 321         obj->backends[obj->backends_num] = strdup(info->plugin_name);
 322         if (! obj->backends[obj->backends_num])
 323                 return -1;
 324
 325         ++obj->backends_num;
 326         return 0;
 327 } /* record_backend */
 328
 329 static int
 330 store_obj(sdb_store_obj_t *parent, sdb_avltree_t *parent_tree,
 331                 int type, const char *name, sdb_time_t last_update,
 332                 sdb_store_obj_t **updated_obj)
 333 {
 334         sdb_store_obj_t *old, *new;
 335         int status = 0;
 336
 337         assert(parent_tree);
 338
 339         if (last_update <= 0)
 340                 last_update = sdb_gettime();
 341
 342         old = STORE_OBJ(sdb_avltree_lookup(parent_tree, name));
 343         if (old) {
 344                 if (old->last_update > last_update) {
 345                         sdb_log(SDB_LOG_DEBUG, "store: Cannot update %s '%s' - "
 346                                         "value too old (%"PRIsdbTIME" < %"PRIsdbTIME")",
 347                                         SDB_STORE_TYPE_TO_NAME(type), name,
 348                                         last_update, old->last_update);
 349                         /* don't report an error; the object may be updated by multiple
 350                          * backends */
 351                         status = 1;
 352                 }
 353                 else if (old->last_update == last_update) {
 354                         /* don't report an error and also don't even log this to avoid
 355                          * excessive noise on high sampling frequencies */
 356                         status = 1;
 357                 }
 358                 else {
 359                         sdb_time_t interval = last_update - old->last_update;
 360                         old->last_update = last_update;
 361                         if (interval) {
 362                                 if (old->interval)
 363                                         old->interval = (sdb_time_t)((0.9 * (double)old->interval)
 364                                                         + (0.1 * (double)interval));
 365                                 else
 366                                         old->interval = interval;
 367                         }
 368                 }
 369
 370                 new = old;
 371                 sdb_object_deref(SDB_OBJ(old));
 372         }
 373         else {
 374                 if (type == SDB_ATTRIBUTE) {
 375                         /* the value will be updated by the caller */
 376                         new = STORE_OBJ(sdb_object_create(name, attribute_type,
 377                                                 type, last_update, NULL));
 378                 }
 379                 else {
 380                         sdb_type_t t;
 381                         t = type == SDB_HOST
 382                                 ? host_type
 383                                 : type == SDB_SERVICE
 384                                         ? service_type
 385                                         : metric_type;
 386                         new = STORE_OBJ(sdb_object_create(name, t, type, last_update));
 387                 }
 388
 389                 if (new) {
 390                         status = sdb_avltree_insert(parent_tree, SDB_OBJ(new));
 391
 392                         /* pass control to the tree or destroy in case of an error */
 393                         sdb_object_deref(SDB_OBJ(new));
 394                 }
 395                 else {
 396                         char errbuf[1024];
 397                         sdb_log(SDB_LOG_ERR, "store: Failed to create %s '%s': %s",
 398                                         SDB_STORE_TYPE_TO_NAME(type), name,
 399                                         sdb_strerror(errno, errbuf, sizeof(errbuf)));
 400                         status = -1;
 401                 }
 402         }
 403
 404         if (status < 0)
 405                 return status;
 406         assert(new);
 407
 408         if (new->parent != parent) {
 409                 // Avoid circular self-references which are not handled
 410                 // correctly by the ref-count based management layer.
 411                 //sdb_object_deref(SDB_OBJ(new->parent));
 412                 //sdb_object_ref(SDB_OBJ(parent));
 413                 new->parent = parent;
 414         }
 415
 416         if (updated_obj)
 417                 *updated_obj = new;
 418
 419         if (record_backend(new))
 420                 return -1;
 421         return status;
 422 } /* store_obj */
 423
 424 static int
 425 store_attr(sdb_store_obj_t *parent, sdb_avltree_t *attributes,
 426                 const char *key, const sdb_data_t *value, sdb_time_t last_update)
 427 {
 428         sdb_store_obj_t *attr = NULL;
 429         int status;
 430
 431         status = store_obj(parent, attributes, SDB_ATTRIBUTE,
 432                         key, last_update, &attr);
 433         if (status)
 434                 return status;
 435
 436         /* don't update unchanged values */
 437         if (! sdb_data_cmp(&ATTR(attr)->value, value))
 438                 return status;
 439
 440         assert(attr);
 441         if (sdb_data_copy(&ATTR(attr)->value, value))
 442                 return -1;
 443         return status;
 444 } /* store_attr */
 445
 446 static int
 447 store_metric_store(sdb_metric_t *metric, sdb_metric_store_t *store)
 448 {
 449         char *type = metric->store.type;
 450         char *id = metric->store.id;
 451
 452         if ((! metric->store.type) || strcasecmp(metric->store.type, store->type)) {
 453                 if (! (type = strdup(store->type)))
 454                         return -1;
 455         }
 456         if ((! metric->store.id) || strcasecmp(metric->store.id, store->id)) {
 457                 if (! (id = strdup(store->id))) {
 458                         if (type != metric->store.type)
 459                                 free(type);
 460                         return -1;
 461                 }
 462         }
 463
 464         if (type != metric->store.type) {
 465                 if (metric->store.type)
 466                         free(metric->store.type);
 467                 metric->store.type = type;
 468         }
 469         if (id != metric->store.id) {
 470                 if (metric->store.id)
 471                         free(metric->store.id);
 472                 metric->store.id = id;
 473         }
 474         return 0;
 475 } /* store_metric_store */
 476
 477 /* The store's host_lock has to be acquired before calling this function. */
 478 static sdb_avltree_t *
 479 get_host_children(sdb_host_t *host, int type)
 480 {
 481         if ((type != SDB_SERVICE) && (type != SDB_METRIC)
 482                         && (type != SDB_ATTRIBUTE))
 483                 return NULL;
 484
 485         if (! host)
 486                 return NULL;
 487
 488         if (type == SDB_ATTRIBUTE)
 489                 return host->attributes;
 490         else if (type == SDB_METRIC)
 491                 return host->metrics;
 492         else
 493                 return host->services;
 494 } /* get_host_children */
 495
 496 /*
 497  * ts_tojson serializes a time-series to JSON.
 498  *
 499  * The function never returns an error. Rather, an error message will be part
 500  * of the serialized data.
 501  */
 502 static void
 503 ts_tojson(sdb_timeseries_t *ts, sdb_strbuf_t *buf)
 504 {
 505         char start_str[64];
 506         char end_str[64];
 507
 508         size_t i;
 509
 510         /* TODO: make time format configurable */
 511         if (! sdb_strftime(start_str, sizeof(start_str), ts->start))
 512                 snprintf(start_str, sizeof(start_str), "<error>");
 513         start_str[sizeof(start_str) - 1] = '\0';
 514         if (! sdb_strftime(end_str, sizeof(end_str), ts->end))
 515                 snprintf(end_str, sizeof(end_str), "<error>");
 516         end_str[sizeof(end_str) - 1] = '\0';
 517
 518         sdb_strbuf_append(buf, "{\"start\": \"%s\", \"end\": \"%s\", \"data\": {",
 519                         start_str, end_str);
 520
 521         for (i = 0; i < ts->data_names_len; ++i) {
 522                 size_t j;
 523                 sdb_strbuf_append(buf, "\"%s\": [", ts->data_names[i]);
 524
 525                 for (j = 0; j < ts->data_len; ++j) {
 526                         char time_str[64];
 527
 528                         if (! sdb_strftime(time_str, sizeof(time_str), ts->data[i][j].timestamp))
 529                                 snprintf(time_str, sizeof(time_str), "<error>");
 530                         time_str[sizeof(time_str) - 1] = '\0';
 531
 532                         /* Some GNU libc versions may print '-nan' which we dont' want */
 533                         if (isnan(ts->data[i][j].value))
 534                                 sdb_strbuf_append(buf, "{\"timestamp\": \"%s\", "
 535                                                 "\"value\": \"nan\"}", time_str);
 536                         else
 537                                 sdb_strbuf_append(buf, "{\"timestamp\": \"%s\", "
 538                                                 "\"value\": \"%f\"}", time_str, ts->data[i][j].value);
 539
 540                         if (j < ts->data_len - 1)
 541                                 sdb_strbuf_append(buf, ",");
 542                 }
 543
 544                 if (i < ts->data_names_len - 1)
 545                         sdb_strbuf_append(buf, "],");
 546                 else
 547                         sdb_strbuf_append(buf, "]");
 548         }
 549         sdb_strbuf_append(buf, "}}");
 550 } /* ts_tojson */
 551
 552 /*
 553  * store writer API
 554  */
 555
 556 static int
 557 store_attribute(const char *hostname,
 558                 const char *key, const sdb_data_t *value,
 559                 sdb_time_t last_update, sdb_object_t *user_data)
 560 {
 561         sdb_store_t *st = SDB_STORE(user_data);
 562
 563         sdb_host_t *host;
 564         sdb_avltree_t *attrs;
 565         int status = 0;
 566
 567         if ((! hostname) || (! key))
 568                 return -1;
 569
 570         pthread_rwlock_wrlock(&st->host_lock);
 571         host = HOST(sdb_avltree_lookup(st->hosts, hostname));
 572         attrs = get_host_children(host, SDB_ATTRIBUTE);
 573         if (! attrs) {
 574                 sdb_log(SDB_LOG_ERR, "store: Failed to store attribute '%s' - "
 575                                 "host '%s' not found", key, hostname);
 576                 status = -1;
 577         }
 578
 579         if (! status)
 580                 status = store_attr(STORE_OBJ(host), attrs, key, value, last_update);
 581
 582         sdb_object_deref(SDB_OBJ(host));
 583         pthread_rwlock_unlock(&st->host_lock);
 584
 585         return status;
 586 } /* store_attribute */
 587
 588 static int
 589 store_host(const char *name, sdb_time_t last_update, sdb_object_t *user_data)
 590 {
 591         sdb_store_t *st = SDB_STORE(user_data);
 592         int status = 0;
 593
 594         if (! name)
 595                 return -1;
 596
 597         pthread_rwlock_wrlock(&st->host_lock);
 598         status = store_obj(NULL, st->hosts,
 599                         SDB_HOST, name, last_update, NULL);
 600         pthread_rwlock_unlock(&st->host_lock);
 601
 602         return status;
 603 } /* store_host */
 604
 605 static int
 606 store_service_attr(const char *hostname, const char *service,
 607                 const char *key, const sdb_data_t *value, sdb_time_t last_update,
 608                 sdb_object_t *user_data)
 609 {
 610         sdb_store_t *st = SDB_STORE(user_data);
 611
 612         sdb_host_t *host;
 613         sdb_service_t *svc;
 614         sdb_avltree_t *services;
 615         int status = 0;
 616
 617         if ((! hostname) || (! service) || (! key))
 618                 return -1;
 619
 620         pthread_rwlock_wrlock(&st->host_lock);
 621         host = HOST(sdb_avltree_lookup(st->hosts, hostname));
 622         services = get_host_children(host, SDB_SERVICE);
 623         sdb_object_deref(SDB_OBJ(host));
 624         if (! services) {
 625                 sdb_log(SDB_LOG_ERR, "store: Failed to store attribute '%s' "
 626                                 "for service '%s' - host '%ss' not found",
 627                                 key, service, hostname);
 628                 pthread_rwlock_unlock(&st->host_lock);
 629                 return -1;
 630         }
 631
 632         svc = SVC(sdb_avltree_lookup(services, service));
 633         if (! svc) {
 634                 sdb_log(SDB_LOG_ERR, "store: Failed to store attribute '%s' - "
 635                                 "service '%s/%s' not found", key, hostname, service);
 636                 status = -1;
 637         }
 638
 639         if (! status)
 640                 status = store_attr(STORE_OBJ(svc), svc->attributes,
 641                                 key, value, last_update);
 642
 643         sdb_object_deref(SDB_OBJ(svc));
 644         pthread_rwlock_unlock(&st->host_lock);
 645
 646         return status;
 647 } /* store_service_attr */
 648
 649 static int
 650 store_service(const char *hostname, const char *name,
 651                 sdb_time_t last_update, sdb_object_t *user_data)
 652 {
 653         sdb_store_t *st = SDB_STORE(user_data);
 654
 655         sdb_host_t *host;
 656         sdb_avltree_t *services;
 657         sdb_data_t d;
 658
 659         int status = 0;
 660
 661         if ((! hostname) || (! name))
 662                 return -1;
 663
 664         pthread_rwlock_wrlock(&st->host_lock);
 665         host = HOST(sdb_avltree_lookup(st->hosts, hostname));
 666         services = get_host_children(host, SDB_SERVICE);
 667         if (! services) {
 668                 sdb_log(SDB_LOG_ERR, "store: Failed to store service '%s' - "
 669                                 "host '%s' not found", name, hostname);
 670                 status = -1;
 671         }
 672
 673         if (! status)
 674                 status = store_obj(STORE_OBJ(host), services, SDB_SERVICE,
 675                                 name, last_update, NULL);
 676
 677         sdb_object_deref(SDB_OBJ(host));
 678         pthread_rwlock_unlock(&st->host_lock);
 679
 680         if (status)
 681                 return status;
 682
 683         /* record the hostname as an attribute */
 684         d.type = SDB_TYPE_STRING;
 685         d.data.string = SDB_OBJ(host)->name;
 686         if (store_service_attr(hostname, name, "hostname", &d, last_update, user_data))
 687                 status = -1;
 688         return status;
 689 } /* store_service */
 690
 691 static int
 692 store_metric_attr(const char *hostname, const char *metric,
 693                 const char *key, const sdb_data_t *value, sdb_time_t last_update,
 694                 sdb_object_t *user_data)
 695 {
 696         sdb_store_t *st = SDB_STORE(user_data);
 697
 698         sdb_avltree_t *metrics;
 699         sdb_host_t *host;
 700         sdb_metric_t *m;
 701         int status = 0;
 702
 703         if ((! hostname) || (! metric) || (! key))
 704                 return -1;
 705
 706         pthread_rwlock_wrlock(&st->host_lock);
 707         host = HOST(sdb_avltree_lookup(st->hosts, hostname));
 708         metrics = get_host_children(host, SDB_METRIC);
 709         sdb_object_deref(SDB_OBJ(host));
 710         if (! metrics) {
 711                 sdb_log(SDB_LOG_ERR, "store: Failed to store attribute '%s' "
 712                                 "for metric '%s' - host '%s' not found",
 713                                 key, metric, hostname);
 714                 pthread_rwlock_unlock(&st->host_lock);
 715                 return -1;
 716         }
 717
 718         m = METRIC(sdb_avltree_lookup(metrics, metric));
 719         if (! m) {
 720                 sdb_log(SDB_LOG_ERR, "store: Failed to store attribute '%s' - "
 721                                 "metric '%s/%s' not found", key, hostname, metric);
 722                 status = -1;
 723         }
 724
 725         if (! status)
 726                 status = store_attr(STORE_OBJ(m), m->attributes,
 727                                 key, value, last_update);
 728
 729         sdb_object_deref(SDB_OBJ(m));
 730         pthread_rwlock_unlock(&st->host_lock);
 731
 732         return status;
 733 } /* store_metric_attr */
 734
 735 static int
 736 store_metric(const char *hostname, const char *name,
 737                 sdb_metric_store_t *store, sdb_time_t last_update,
 738                 sdb_object_t *user_data)
 739 {
 740         sdb_store_t *st = SDB_STORE(user_data);
 741
 742         sdb_store_obj_t *obj = NULL;
 743         sdb_host_t *host;
 744         sdb_metric_t *metric;
 745         sdb_data_t d;
 746
 747         sdb_avltree_t *metrics;
 748
 749         int status = 0;
 750
 751         if ((! hostname) || (! name))
 752                 return -1;
 753
 754         if (store) {
 755                 if ((store->type != NULL) != (store->id != NULL))
 756                         return -1;
 757                 else if (! store->type)
 758                         store = NULL;
 759         }
 760
 761         pthread_rwlock_wrlock(&st->host_lock);
 762         host = HOST(sdb_avltree_lookup(st->hosts, hostname));
 763         metrics = get_host_children(host, SDB_METRIC);
 764         if (! metrics) {
 765                 sdb_log(SDB_LOG_ERR, "store: Failed to store metric '%s' - "
 766                                 "host '%s' not found", name, hostname);
 767                 status = -1;
 768         }
 769
 770         if (! status)
 771                 status = store_obj(STORE_OBJ(host), metrics, SDB_METRIC,
 772                                 name, last_update, &obj);
 773         sdb_object_deref(SDB_OBJ(host));
 774
 775         if (status) {
 776                 pthread_rwlock_unlock(&st->host_lock);
 777                 return status;
 778         }
 779
 780         assert(obj);
 781         metric = METRIC(obj);
 782
 783         if (store)
 784                 if (store_metric_store(metric, store))
 785                         status = -1;
 786         pthread_rwlock_unlock(&st->host_lock);
 787
 788         /* record the hostname as an attribute */
 789         d.type = SDB_TYPE_STRING;
 790         d.data.string = SDB_OBJ(host)->name;
 791         if (store_metric_attr(hostname, name, "hostname", &d, last_update, user_data))
 792                 status = -1;
 793         return status;
 794 } /* store_metric */
 795
 796 sdb_store_writer_t sdb_store_writer = {
 797         store_host, store_service, store_metric,
 798         store_attribute, store_service_attr, store_metric_attr,
 799 };
 800
 801 static sdb_object_t *
 802 prepare_query(sdb_ast_node_t *ast,
 803                 sdb_strbuf_t __attribute__((unused)) *errbuf,
 804                 sdb_object_t __attribute__((unused)) *user_data)
 805 {
 806         return SDB_OBJ(sdb_store_query_prepare(ast));
 807 } /* prepare_query */
 808
 809 static int
 810 execute_query(sdb_object_t *q,
 811                 sdb_strbuf_t *buf, sdb_strbuf_t *errbuf,
 812                 sdb_object_t *user_data)
 813 {
 814         return sdb_store_query_execute(SDB_STORE(user_data),
 815                         QUERY(q), buf, errbuf);
 816 } /* execute_query */
 817
 818 sdb_store_reader_t sdb_store_reader = {
 819         prepare_query, execute_query,
 820 };
 821
 822 /*
 823  * public API
 824  */
 825
 826 sdb_store_t *
 827 sdb_store_create(void)
 828 {
 829         return SDB_STORE(sdb_object_create("store", store_type));
 830 } /* sdb_store_create */
 831
 832 int
 833 sdb_store_host(sdb_store_t *store, const char *name, sdb_time_t last_update)
 834 {
 835         return store_host(name, last_update, SDB_OBJ(store));
 836 } /* sdb_store_host */
 837
 838 int
 839 sdb_store_service(sdb_store_t *store, const char *hostname, const char *name,
 840                 sdb_time_t last_update)
 841 {
 842         return store_service(hostname, name, last_update, SDB_OBJ(store));
 843 } /* sdb_store_service */
 844
 845 int
 846 sdb_store_metric(sdb_store_t *store, const char *hostname, const char *name,
 847                 sdb_metric_store_t *metric_store, sdb_time_t last_update)
 848 {
 849         return store_metric(hostname, name, metric_store, last_update, SDB_OBJ(store));
 850 } /* sdb_store_metric */
 851
 852 int
 853 sdb_store_attribute(sdb_store_t *store, const char *hostname,
 854                 const char *key, const sdb_data_t *value, sdb_time_t last_update)
 855 {
 856         return store_attribute(hostname, key, value, last_update, SDB_OBJ(store));
 857 } /* sdb_store_attribute */
 858
 859 int
 860 sdb_store_service_attr(sdb_store_t *store, const char *hostname,
 861                 const char *service, const char *key, const sdb_data_t *value,
 862                 sdb_time_t last_update)
 863 {
 864         return store_service_attr(hostname, service, key, value,
 865                         last_update, SDB_OBJ(store));
 866 } /* sdb_store_service_attr */
 867
 868 int
 869 sdb_store_metric_attr(sdb_store_t *store, const char *hostname,
 870                 const char *metric, const char *key, const sdb_data_t *value,
 871                 sdb_time_t last_update)
 872 {
 873         return store_metric_attr(hostname, metric, key, value,
 874                         last_update, SDB_OBJ(store));
 875 } /* sdb_store_metric_attr */
 876
 877 sdb_store_obj_t *
 878 sdb_store_get_host(sdb_store_t *store, const char *name)
 879 {
 880         sdb_host_t *host;
 881
 882         if ((! store) || (! name))
 883                 return NULL;
 884
 885         host = HOST(sdb_avltree_lookup(store->hosts, name));
 886         if (! host)
 887                 return NULL;
 888
 889         return STORE_OBJ(host);
 890 } /* sdb_store_get_host */
 891
 892 sdb_store_obj_t *
 893 sdb_store_get_child(sdb_store_obj_t *host, int type, const char *name)
 894 {
 895         sdb_avltree_t *children;
 896
 897         if ((! host) || (host->type != SDB_HOST) || (! name))
 898                 return NULL;
 899
 900         children = get_host_children(HOST(host), type);
 901         if (! children)
 902                 return NULL;
 903         return STORE_OBJ(sdb_avltree_lookup(children, name));
 904 } /* sdb_store_get_child */
 905
 906 int
 907 sdb_store_get_field(sdb_store_obj_t *obj, int field, sdb_data_t *res)
 908 {
 909         sdb_data_t tmp;
 910
 911         if (! obj)
 912                 return -1;
 913
 914         switch (field) {
 915                 case SDB_FIELD_NAME:
 916                         tmp.type = SDB_TYPE_STRING;
 917                         tmp.data.string = strdup(SDB_OBJ(obj)->name);
 918                         if (! tmp.data.string)
 919                                 return -1;
 920                         break;
 921                 case SDB_FIELD_LAST_UPDATE:
 922                         tmp.type = SDB_TYPE_DATETIME;
 923                         tmp.data.datetime = obj->last_update;
 924                         break;
 925                 case SDB_FIELD_AGE:
 926                         tmp.type = SDB_TYPE_DATETIME;
 927                         tmp.data.datetime = sdb_gettime() - obj->last_update;
 928                         break;
 929                 case SDB_FIELD_INTERVAL:
 930                         tmp.type = SDB_TYPE_DATETIME;
 931                         tmp.data.datetime = obj->interval;
 932                         break;
 933                 case SDB_FIELD_BACKEND:
 934                         if (! res)
 935                                 return 0;
 936                         tmp.type = SDB_TYPE_ARRAY | SDB_TYPE_STRING;
 937                         tmp.data.array.length = obj->backends_num;
 938                         tmp.data.array.values = obj->backends;
 939                         return sdb_data_copy(res, &tmp);
 940                 case SDB_FIELD_VALUE:
 941                         if (obj->type != SDB_ATTRIBUTE)
 942                                 return -1;
 943                         if (! res)
 944                                 return 0;
 945                         return sdb_data_copy(res, &ATTR(obj)->value);
 946                 case SDB_FIELD_TIMESERIES:
 947                         if (obj->type != SDB_METRIC)
 948                                 return -1;
 949                         tmp.type = SDB_TYPE_BOOLEAN;
 950                         tmp.data.boolean = METRIC(obj)->store.type != NULL;
 951                 default:
 952                         return -1;
 953         }
 954         if (res)
 955                 *res = tmp;
 956         else
 957                 sdb_data_free_datum(&tmp);
 958         return 0;
 959 } /* sdb_store_get_field */
 960
 961 int
 962 sdb_store_get_attr(sdb_store_obj_t *obj, const char *name, sdb_data_t *res,
 963                 sdb_store_matcher_t *filter)
 964 {
 965         sdb_avltree_t *tree = NULL;
 966         sdb_store_obj_t *attr;
 967
 968         if ((! obj) || (! name))
 969                 return -1;
 970
 971         if (obj->type == SDB_HOST)
 972                 tree = HOST(obj)->attributes;
 973         else if (obj->type == SDB_SERVICE)
 974                 tree = SVC(obj)->attributes;
 975         else if (obj->type == SDB_METRIC)
 976                 tree = METRIC(obj)->attributes;
 977
 978         if (! tree)
 979                 return -1;
 980
 981         attr = STORE_OBJ(sdb_avltree_lookup(tree, name));
 982         if (! attr)
 983                 return -1;
 984         if (filter && (! sdb_store_matcher_matches(filter, attr, NULL))) {
 985                 sdb_object_deref(SDB_OBJ(attr));
 986                 return -1;
 987         }
 988
 989         assert(STORE_OBJ(attr)->type == SDB_ATTRIBUTE);
 990         if (res)
 991                 sdb_data_copy(res, &ATTR(attr)->value);
 992         sdb_object_deref(SDB_OBJ(attr));
 993         return 0;
 994 } /* sdb_store_get_attr */
 995
 996 /* TODO: sdb_store_fetch_timeseries should move into the plugin module */
 997
 998 int
 999 sdb_store_fetch_timeseries(sdb_store_t *store,
1000                 const char *hostname, const char *metric,
1001                 sdb_timeseries_opts_t *opts, sdb_strbuf_t *buf)
1002 {
1003         sdb_avltree_t *metrics;
1004         sdb_host_t *host;
1005         sdb_metric_t *m;
1006
1007         sdb_timeseries_t *ts;
1008
1009         int status = 0;
1010
1011         if ((! store) || (! hostname) || (! metric) || (! opts) || (! buf))
1012                 return -1;
1013
1014         pthread_rwlock_rdlock(&store->host_lock);
1015         host = HOST(sdb_avltree_lookup(store->hosts, hostname));
1016         metrics = get_host_children(host, SDB_METRIC);
1017         sdb_object_deref(SDB_OBJ(host));
1018         if (! metrics) {
1019                 sdb_log(SDB_LOG_ERR, "store: Failed to fetch time-series '%s/%s' "
1020                                 "- host '%s' not found", hostname, metric, hostname);
1021                 pthread_rwlock_unlock(&store->host_lock);
1022                 return -1;
1023         }
1024
1025         m = METRIC(sdb_avltree_lookup(metrics, metric));
1026         if (! m) {
1027                 sdb_log(SDB_LOG_ERR, "store: Failed to fetch time-series '%s/%s' "
1028                                 "- metric '%s' not found", hostname, metric, metric);
1029                 pthread_rwlock_unlock(&store->host_lock);
1030                 return -1;
1031         }
1032
1033         if ((! m->store.type) || (! m->store.id)) {
1034                 sdb_log(SDB_LOG_ERR, "store: Failed to fetch time-series '%s/%s' "
1035                                 "- no data-store configured for the stored metric",
1036                                 hostname, metric);
1037                 sdb_object_deref(SDB_OBJ(m));
1038                 pthread_rwlock_unlock(&store->host_lock);
1039                 return -1;
1040         }
1041
1042         {
1043                 char type[strlen(m->store.type) + 1];
1044                 char id[strlen(m->store.id) + 1];
1045
1046                 strncpy(type, m->store.type, sizeof(type));
1047                 strncpy(id, m->store.id, sizeof(id));
1048                 pthread_rwlock_unlock(&store->host_lock);
1049
1050                 ts = sdb_plugin_fetch_timeseries(type, id, opts);
1051                 if (! ts) {
1052                         sdb_log(SDB_LOG_ERR, "store: Failed to fetch time-series '%s/%s' "
1053                                         "- %s fetcher callback returned no data for '%s'",
1054                                         hostname, metric, type, id);
1055                         status = -1;
1056                 }
1057         }
1058
1059         ts_tojson(ts, buf);
1060         sdb_object_deref(SDB_OBJ(m));
1061         sdb_timeseries_destroy(ts);
1062         return status;
1063 } /* sdb_store_fetch_timeseries */
1064
1065 int
1066 sdb_store_scan(sdb_store_t *store, int type,
1067                 sdb_store_matcher_t *m, sdb_store_matcher_t *filter,
1068                 sdb_store_lookup_cb cb, void *user_data)
1069 {
1070         sdb_avltree_iter_t *host_iter = NULL;
1071         int status = 0;
1072
1073         if ((! store) || (! cb))
1074                 return -1;
1075
1076         if ((type != SDB_HOST) && (type != SDB_SERVICE) && (type != SDB_METRIC)) {
1077                 sdb_log(SDB_LOG_ERR, "store: Cannot scan objects of type %d", type);
1078                 return -1;
1079         }
1080
1081         pthread_rwlock_rdlock(&store->host_lock);
1082         host_iter = sdb_avltree_get_iter(store->hosts);
1083         if (! host_iter)
1084                 status = -1;
1085
1086         /* has_next returns false if the iterator is NULL */
1087         while (sdb_avltree_iter_has_next(host_iter)) {
1088                 sdb_store_obj_t *host;
1089                 sdb_avltree_iter_t *iter = NULL;
1090
1091                 host = STORE_OBJ(sdb_avltree_iter_get_next(host_iter));
1092                 assert(host);
1093
1094                 if (! sdb_store_matcher_matches(filter, host, NULL))
1095                         continue;
1096
1097                 if (type == SDB_SERVICE)
1098                         iter = sdb_avltree_get_iter(HOST(host)->services);
1099                 else if (type == SDB_METRIC)
1100                         iter = sdb_avltree_get_iter(HOST(host)->metrics);
1101
1102                 if (iter) {
1103                         while (sdb_avltree_iter_has_next(iter)) {
1104                                 sdb_store_obj_t *obj;
1105                                 obj = STORE_OBJ(sdb_avltree_iter_get_next(iter));
1106                                 assert(obj);
1107
1108                                 if (sdb_store_matcher_matches(m, obj, filter)) {
1109                                         if (cb(obj, filter, user_data)) {
1110                                                 sdb_log(SDB_LOG_ERR, "store: Callback returned "
1111                                                                 "an error while scanning");
1112                                                 status = -1;
1113                                                 break;
1114                                         }
1115                                 }
1116                         }
1117                 }
1118                 else if (sdb_store_matcher_matches(m, host, filter)) {
1119                         if (cb(host, filter, user_data)) {
1120                                 sdb_log(SDB_LOG_ERR, "store: Callback returned "
1121                                                 "an error while scanning");
1122                                 status = -1;
1123                         }
1124                 }
1125
1126                 sdb_avltree_iter_destroy(iter);
1127                 if (status)
1128                         break;
1129         }
1130
1131         sdb_avltree_iter_destroy(host_iter);
1132         pthread_rwlock_unlock(&store->host_lock);
1133         return status;
1134 } /* sdb_store_scan */
1135
1136 /* vim: set tw=78 sw=4 ts=4 noexpandtab : */
1137