src/core/memstore.c

   1 /*
   2  * SysDB - src/core/memstore.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/memstore-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 #include <strings.h>
  46
  47 #include <pthread.h>
  48
  49 /*
  50  * private types
  51  */
  52
  53 struct sdb_memstore {
  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 /* internal representation of a to-be-stored object */
  63 typedef struct {
  64         sdb_memstore_obj_t *parent;
  65         sdb_avltree_t *parent_tree;
  66         int type;
  67         const char *name;
  68         sdb_time_t last_update;
  69         sdb_time_t interval;
  70         const char * const *backends;
  71         size_t backends_num;
  72 } store_obj_t;
  73 #define STORE_OBJ_INIT { NULL, NULL, 0, NULL, 0, 0, NULL, 0 }
  74
  75 static sdb_type_t host_type;
  76 static sdb_type_t service_type;
  77 static sdb_type_t metric_type;
  78 static sdb_type_t attribute_type;
  79
  80 static int
  81 store_init(sdb_object_t *obj, va_list __attribute__((unused)) ap)
  82 {
  83         int err;
  84         if (! (SDB_MEMSTORE(obj)->hosts = sdb_avltree_create()))
  85                 return -1;
  86         if ((err = pthread_rwlock_init(&SDB_MEMSTORE(obj)->host_lock,
  87                                         /* attr = */ NULL))) {
  88                 char errbuf[128];
  89                 sdb_log(SDB_LOG_ERR, "memstore: Failed to initialize lock: %s",
  90                                 sdb_strerror(err, errbuf, sizeof(errbuf)));
  91                 return -1;
  92         }
  93         return 0;
  94 } /* store_init */
  95
  96 static void
  97 store_destroy(sdb_object_t *obj)
  98 {
  99         int err;
 100         if ((err = pthread_rwlock_destroy(&SDB_MEMSTORE(obj)->host_lock))) {
 101                 char errbuf[128];
 102                 sdb_log(SDB_LOG_ERR, "memstore: Failed to destroy lock: %s",
 103                                 sdb_strerror(err, errbuf, sizeof(errbuf)));
 104                 return;
 105         }
 106         sdb_avltree_destroy(SDB_MEMSTORE(obj)->hosts);
 107         SDB_MEMSTORE(obj)->hosts = NULL;
 108 } /* store_destroy */
 109
 110 static int
 111 store_obj_init(sdb_object_t *obj, va_list ap)
 112 {
 113         sdb_memstore_obj_t *sobj = STORE_OBJ(obj);
 114         sobj->type = va_arg(ap, int);
 115         return 0;
 116 } /* store_obj_init */
 117
 118 static void
 119 store_obj_destroy(sdb_object_t *obj)
 120 {
 121         sdb_memstore_obj_t *sobj = STORE_OBJ(obj);
 122         size_t i;
 123
 124         for (i = 0; i < sobj->backends_num; ++i)
 125                 free(sobj->backends[i]);
 126         free(sobj->backends);
 127         sobj->backends = NULL;
 128         sobj->backends_num = 0;
 129
 130         // We don't currently keep an extra reference for parent objects to
 131         // avoid circular self-references which are not handled correctly by
 132         // the ref-count base management layer.
 133         //sdb_object_deref(SDB_OBJ(sobj->parent));
 134 } /* store_obj_destroy */
 135
 136 static int
 137 host_init(sdb_object_t *obj, va_list ap)
 138 {
 139         host_t *sobj = HOST(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->services = sdb_avltree_create();
 148         if (! sobj->services)
 149                 return -1;
 150         sobj->metrics = sdb_avltree_create();
 151         if (! sobj->metrics)
 152                 return -1;
 153         sobj->attributes = sdb_avltree_create();
 154         if (! sobj->attributes)
 155                 return -1;
 156         return 0;
 157 } /* host_init */
 158
 159 static void
 160 host_destroy(sdb_object_t *obj)
 161 {
 162         host_t *sobj = HOST(obj);
 163         assert(obj);
 164
 165         store_obj_destroy(obj);
 166
 167         if (sobj->services)
 168                 sdb_avltree_destroy(sobj->services);
 169         if (sobj->metrics)
 170                 sdb_avltree_destroy(sobj->metrics);
 171         if (sobj->attributes)
 172                 sdb_avltree_destroy(sobj->attributes);
 173 } /* host_destroy */
 174
 175 static int
 176 service_init(sdb_object_t *obj, va_list ap)
 177 {
 178         service_t *sobj = SVC(obj);
 179         int ret;
 180
 181         /* this will consume the first argument (type) of ap */
 182         ret = store_obj_init(obj, ap);
 183         if (ret)
 184                 return ret;
 185
 186         sobj->attributes = sdb_avltree_create();
 187         if (! sobj->attributes)
 188                 return -1;
 189         return 0;
 190 } /* service_init */
 191
 192 static void
 193 service_destroy(sdb_object_t *obj)
 194 {
 195         service_t *sobj = SVC(obj);
 196         assert(obj);
 197
 198         store_obj_destroy(obj);
 199
 200         if (sobj->attributes)
 201                 sdb_avltree_destroy(sobj->attributes);
 202 } /* service_destroy */
 203
 204 static int
 205 metric_init(sdb_object_t *obj, va_list ap)
 206 {
 207         metric_t *sobj = METRIC(obj);
 208         int ret;
 209
 210         /* this will consume the first argument (type) of ap */
 211         ret = store_obj_init(obj, ap);
 212         if (ret)
 213                 return ret;
 214
 215         sobj->attributes = sdb_avltree_create();
 216         if (! sobj->attributes)
 217                 return -1;
 218
 219         sobj->store.type = sobj->store.id = NULL;
 220         return 0;
 221 } /* metric_init */
 222
 223 static void
 224 metric_destroy(sdb_object_t *obj)
 225 {
 226         metric_t *sobj = METRIC(obj);
 227         assert(obj);
 228
 229         store_obj_destroy(obj);
 230
 231         if (sobj->attributes)
 232                 sdb_avltree_destroy(sobj->attributes);
 233
 234         if (sobj->store.type)
 235                 free(sobj->store.type);
 236         if (sobj->store.id)
 237                 free(sobj->store.id);
 238 } /* metric_destroy */
 239
 240 static int
 241 attr_init(sdb_object_t *obj, va_list ap)
 242 {
 243         const sdb_data_t *value;
 244         int ret;
 245
 246         /* this will consume the first argument (type) of ap */
 247         ret = store_obj_init(obj, ap);
 248         if (ret)
 249                 return ret;
 250         value = va_arg(ap, const sdb_data_t *);
 251
 252         if (value)
 253                 if (sdb_data_copy(&ATTR(obj)->value, value))
 254                         return -1;
 255         return 0;
 256 } /* attr_init */
 257
 258 static void
 259 attr_destroy(sdb_object_t *obj)
 260 {
 261         assert(obj);
 262
 263         store_obj_destroy(obj);
 264         sdb_data_free_datum(&ATTR(obj)->value);
 265 } /* attr_destroy */
 266
 267 static sdb_type_t store_type = {
 268         /* size = */ sizeof(sdb_memstore_t),
 269         /* init = */ store_init,
 270         /* destroy = */ store_destroy,
 271 };
 272
 273 static sdb_type_t host_type = {
 274         /* size = */ sizeof(host_t),
 275         /* init = */ host_init,
 276         /* destroy = */ host_destroy
 277 };
 278
 279 static sdb_type_t service_type = {
 280         /* size = */ sizeof(service_t),
 281         /* init = */ service_init,
 282         /* destroy = */ service_destroy
 283 };
 284
 285 static sdb_type_t metric_type = {
 286         /* size = */ sizeof(metric_t),
 287         /* init = */ metric_init,
 288         /* destroy = */ metric_destroy
 289 };
 290
 291 static sdb_type_t attribute_type = {
 292         /* size = */ sizeof(attr_t),
 293         /* init = */ attr_init,
 294         /* destroy = */ attr_destroy
 295 };
 296
 297 /*
 298  * private helper functions
 299  */
 300
 301 static int
 302 record_backends(sdb_memstore_obj_t *obj,
 303                 const char * const *backends, size_t backends_num)
 304 {
 305         char **tmp;
 306         size_t i;
 307
 308         for (i = 0; i < backends_num; i++) {
 309                 bool found = 0;
 310                 size_t j;
 311
 312                 for (j = 0; j < obj->backends_num; ++j) {
 313                         if (!strcasecmp(obj->backends[j], backends[i])) {
 314                                 found = 1;
 315                                 break;
 316                         }
 317                 }
 318                 if (found)
 319                         continue;
 320
 321                 tmp = realloc(obj->backends,
 322                                 (obj->backends_num + 1) * sizeof(*obj->backends));
 323                 if (! tmp)
 324                         return -1;
 325
 326                 obj->backends = tmp;
 327                 obj->backends[obj->backends_num] = strdup(backends[i]);
 328                 if (! obj->backends[obj->backends_num])
 329                         return -1;
 330
 331                 ++obj->backends_num;
 332         }
 333         return 0;
 334 } /* record_backends */
 335
 336 static int
 337 store_obj(store_obj_t *obj, sdb_memstore_obj_t **updated_obj)
 338 {
 339         sdb_memstore_obj_t *old, *new;
 340         int status = 0;
 341
 342         assert(obj->parent_tree);
 343
 344         old = STORE_OBJ(sdb_avltree_lookup(obj->parent_tree, obj->name));
 345         if (old) {
 346                 new = old;
 347                 sdb_object_deref(SDB_OBJ(old));
 348         }
 349         else {
 350                 if (obj->type == SDB_ATTRIBUTE) {
 351                         /* the value will be updated by the caller */
 352                         new = STORE_OBJ(sdb_object_create(obj->name, attribute_type,
 353                                                 obj->type, NULL));
 354                 }
 355                 else {
 356                         sdb_type_t t;
 357                         t = obj->type == SDB_HOST
 358                                 ? host_type
 359                                 : obj->type == SDB_SERVICE
 360                                         ? service_type
 361                                         : metric_type;
 362                         new = STORE_OBJ(sdb_object_create(obj->name, t, obj->type));
 363                 }
 364
 365                 if (new) {
 366                         status = sdb_avltree_insert(obj->parent_tree, SDB_OBJ(new));
 367
 368                         /* pass control to the tree or destroy in case of an error */
 369                         sdb_object_deref(SDB_OBJ(new));
 370                 }
 371                 else {
 372                         char errbuf[1024];
 373                         sdb_log(SDB_LOG_ERR, "memstore: Failed to create %s '%s': %s",
 374                                         SDB_STORE_TYPE_TO_NAME(obj->type), obj->name,
 375                                         sdb_strerror(errno, errbuf, sizeof(errbuf)));
 376                         status = -1;
 377                 }
 378         }
 379
 380         if (status < 0)
 381                 return status;
 382         assert(new);
 383
 384         new->last_update = obj->last_update;
 385         new->interval = obj->interval;
 386
 387         if (new->parent != obj->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(obj->parent));
 392                 new->parent = obj->parent;
 393         }
 394
 395         if (updated_obj)
 396                 *updated_obj = new;
 397
 398         if (record_backends(new, obj->backends, obj->backends_num))
 399                 return -1;
 400         return status;
 401 } /* store_obj */
 402
 403 static int
 404 store_metric_store(metric_t *metric, sdb_store_metric_t *m)
 405 {
 406         char *type = metric->store.type;
 407         char *id = metric->store.id;
 408
 409         if ((! metric->store.type) || strcasecmp(metric->store.type, m->store.type)) {
 410                 if (! (type = strdup(m->store.type)))
 411                         return -1;
 412         }
 413         if ((! metric->store.id) || strcasecmp(metric->store.id, m->store.id)) {
 414                 if (! (id = strdup(m->store.id))) {
 415                         if (type != metric->store.type)
 416                                 free(type);
 417                         return -1;
 418                 }
 419         }
 420
 421         if (type != metric->store.type) {
 422                 if (metric->store.type)
 423                         free(metric->store.type);
 424                 metric->store.type = type;
 425         }
 426         if (id != metric->store.id) {
 427                 if (metric->store.id)
 428                         free(metric->store.id);
 429                 metric->store.id = id;
 430         }
 431         return 0;
 432 } /* store_metric_store */
 433
 434 /* The store's host_lock has to be acquired before calling this function. */
 435 static sdb_avltree_t *
 436 get_host_children(host_t *host, int type)
 437 {
 438         if ((type != SDB_SERVICE) && (type != SDB_METRIC)
 439                         && (type != SDB_ATTRIBUTE))
 440                 return NULL;
 441
 442         if (! host)
 443                 return NULL;
 444
 445         if (type == SDB_ATTRIBUTE)
 446                 return host->attributes;
 447         else if (type == SDB_METRIC)
 448                 return host->metrics;
 449         else
 450                 return host->services;
 451 } /* get_host_children */
 452
 453 static sdb_avltree_t *
 454 get_obj_attrs(sdb_memstore_obj_t *obj)
 455 {
 456         if (obj->type == SDB_HOST)
 457                 return HOST(obj)->attributes;
 458         else if (obj->type == SDB_SERVICE)
 459                 return SVC(obj)->attributes;
 460         else if (obj->type == SDB_METRIC)
 461                 return METRIC(obj)->attributes;
 462         return NULL;
 463 } /* get_obj_attrs */
 464
 465 /*
 466  * store writer API
 467  */
 468
 469 static int
 470 store_attribute(sdb_store_attribute_t *attr, sdb_object_t *user_data)
 471 {
 472         sdb_memstore_t *st = SDB_MEMSTORE(user_data);
 473         store_obj_t obj = STORE_OBJ_INIT;
 474         sdb_memstore_obj_t *new = NULL;
 475         const char *hostname;
 476         host_t *host;
 477
 478         sdb_avltree_t *children = NULL;
 479         int status = 0;
 480
 481         if ((! attr) || (! attr->parent) || (! attr->key))
 482                 return -1;
 483
 484         hostname = attr->hostname;
 485         if (attr->parent_type == SDB_HOST)
 486                 hostname = attr->parent;
 487         if (! hostname)
 488                 return -1;
 489
 490         pthread_rwlock_wrlock(&st->host_lock);
 491         host = HOST(sdb_avltree_lookup(st->hosts, hostname));
 492         if (! host) {
 493                 sdb_log(SDB_LOG_ERR, "memstore: Failed to store attribute '%s' - "
 494                                 "host '%s' not found", attr->key, hostname);
 495                 status = -1;
 496         }
 497
 498         switch (attr->parent_type) {
 499         case SDB_HOST:
 500                 obj.parent = STORE_OBJ(host);
 501                 obj.parent_tree = get_host_children(host, SDB_ATTRIBUTE);
 502                 break;
 503         case SDB_SERVICE:
 504         case SDB_METRIC:
 505                 children = get_host_children(host, attr->parent_type);
 506                 break;
 507         default:
 508                 status = -1;
 509                 break;
 510         }
 511
 512         if (children) {
 513                 obj.parent = STORE_OBJ(sdb_avltree_lookup(children, attr->parent));
 514                 if (! obj.parent) {
 515                         sdb_log(SDB_LOG_ERR, "memstore: Failed to store attribute '%s' - "
 516                                         "%s '%s/%s' not found", attr->key,
 517                                         SDB_STORE_TYPE_TO_NAME(attr->parent_type),
 518                                         attr->hostname, attr->parent);
 519                         status = -1;
 520                 }
 521                 else
 522                         obj.parent_tree = attr->parent_type == SDB_SERVICE
 523                                 ? SVC(obj.parent)->attributes
 524                                 : METRIC(obj.parent)->attributes;
 525         }
 526
 527         obj.type = SDB_ATTRIBUTE;
 528         obj.name = attr->key;
 529         obj.last_update = attr->last_update;
 530         obj.interval = attr->interval;
 531         obj.backends = attr->backends;
 532         obj.backends_num = attr->backends_num;
 533         if (! status)
 534                 status = store_obj(&obj, &new);
 535
 536         if (! status) {
 537                 assert(new);
 538                 /* update the value if it changed */
 539                 if (sdb_data_cmp(&ATTR(new)->value, &attr->value))
 540                         if (sdb_data_copy(&ATTR(new)->value, &attr->value))
 541                                 status = -1;
 542         }
 543
 544         if (obj.parent != STORE_OBJ(host))
 545                 sdb_object_deref(SDB_OBJ(obj.parent));
 546         sdb_object_deref(SDB_OBJ(host));
 547         pthread_rwlock_unlock(&st->host_lock);
 548
 549         return status;
 550 } /* store_attribute */
 551
 552 static int
 553 store_host(sdb_store_host_t *host, sdb_object_t *user_data)
 554 {
 555         sdb_memstore_t *st = SDB_MEMSTORE(user_data);
 556         store_obj_t obj = { NULL, st->hosts, SDB_HOST, NULL, 0, 0, NULL, 0 };
 557         int status = 0;
 558
 559         if ((! host) || (! host->name))
 560                 return -1;
 561
 562         obj.name = host->name;
 563         obj.last_update = host->last_update;
 564         obj.interval = host->interval;
 565         obj.backends = host->backends;
 566         obj.backends_num = host->backends_num;
 567         pthread_rwlock_wrlock(&st->host_lock);
 568         status = store_obj(&obj, NULL);
 569         pthread_rwlock_unlock(&st->host_lock);
 570
 571         return status;
 572 } /* store_host */
 573
 574 static int
 575 store_service(sdb_store_service_t *service, sdb_object_t *user_data)
 576 {
 577         sdb_memstore_t *st = SDB_MEMSTORE(user_data);
 578         store_obj_t obj = STORE_OBJ_INIT;
 579         host_t *host;
 580
 581         int status = 0;
 582
 583         if ((! service) || (! service->hostname) || (! service->name))
 584                 return -1;
 585
 586         pthread_rwlock_wrlock(&st->host_lock);
 587         host = HOST(sdb_avltree_lookup(st->hosts, service->hostname));
 588         obj.parent = STORE_OBJ(host);
 589         obj.parent_tree = get_host_children(host, SDB_SERVICE);
 590         obj.type = SDB_SERVICE;
 591         if (! obj.parent_tree) {
 592                 sdb_log(SDB_LOG_ERR, "memstore: Failed to store service '%s' - "
 593                                 "host '%s' not found", service->name, service->hostname);
 594                 status = -1;
 595         }
 596
 597         obj.name = service->name;
 598         obj.last_update = service->last_update;
 599         obj.interval = service->interval;
 600         obj.backends = service->backends;
 601         obj.backends_num = service->backends_num;
 602         if (! status)
 603                 status = store_obj(&obj, NULL);
 604
 605         sdb_object_deref(SDB_OBJ(host));
 606         pthread_rwlock_unlock(&st->host_lock);
 607         return status;
 608 } /* store_service */
 609
 610 static int
 611 store_metric(sdb_store_metric_t *metric, sdb_object_t *user_data)
 612 {
 613         sdb_memstore_t *st = SDB_MEMSTORE(user_data);
 614         store_obj_t obj = STORE_OBJ_INIT;
 615         sdb_memstore_obj_t *new = NULL;
 616         host_t *host;
 617
 618         int status = 0;
 619
 620         if ((! metric) || (! metric->hostname) || (! metric->name))
 621                 return -1;
 622
 623         if ((metric->store.type != NULL) != (metric->store.id != NULL))
 624                 return -1;
 625
 626         pthread_rwlock_wrlock(&st->host_lock);
 627         host = HOST(sdb_avltree_lookup(st->hosts, metric->hostname));
 628         obj.parent = STORE_OBJ(host);
 629         obj.parent_tree = get_host_children(host, SDB_METRIC);
 630         obj.type = SDB_METRIC;
 631         if (! obj.parent_tree) {
 632                 sdb_log(SDB_LOG_ERR, "memstore: Failed to store metric '%s' - "
 633                                 "host '%s' not found", metric->name, metric->hostname);
 634                 status = -1;
 635         }
 636
 637         obj.name = metric->name;
 638         obj.last_update = metric->last_update;
 639         obj.interval = metric->interval;
 640         obj.backends = metric->backends;
 641         obj.backends_num = metric->backends_num;
 642         if (! status)
 643                 status = store_obj(&obj, &new);
 644         sdb_object_deref(SDB_OBJ(host));
 645
 646         if (status) {
 647                 pthread_rwlock_unlock(&st->host_lock);
 648                 return status;
 649         }
 650
 651         assert(new);
 652         if (metric->store.type && metric->store.id)
 653                 if (store_metric_store(METRIC(new), metric))
 654                         status = -1;
 655         pthread_rwlock_unlock(&st->host_lock);
 656         return status;
 657 } /* store_metric */
 658
 659 sdb_store_writer_t sdb_memstore_writer = {
 660         store_host, store_service, store_metric, store_attribute,
 661 };
 662
 663 /*
 664  * store query API
 665  */
 666
 667 static sdb_object_t *
 668 prepare_query(sdb_ast_node_t *ast,
 669                 sdb_strbuf_t __attribute__((unused)) *errbuf,
 670                 sdb_object_t __attribute__((unused)) *user_data)
 671 {
 672         return SDB_OBJ(sdb_memstore_query_prepare(ast));
 673 } /* prepare_query */
 674
 675 static int
 676 execute_query(sdb_object_t *q,
 677                 sdb_store_writer_t *w, sdb_object_t *wd, sdb_strbuf_t *errbuf,
 678                 sdb_object_t *user_data)
 679 {
 680         return sdb_memstore_query_execute(SDB_MEMSTORE(user_data),
 681                         QUERY(q), w, wd, errbuf);
 682 } /* execute_query */
 683
 684 sdb_store_reader_t sdb_memstore_reader = {
 685         prepare_query, execute_query,
 686 };
 687
 688 /*
 689  * public API
 690  */
 691
 692 sdb_memstore_t *
 693 sdb_memstore_create(void)
 694 {
 695         return SDB_MEMSTORE(sdb_object_create("memstore", store_type));
 696 } /* sdb_memstore_create */
 697
 698 int
 699 sdb_memstore_host(sdb_memstore_t *store, const char *name,
 700                 sdb_time_t last_update, sdb_time_t interval)
 701 {
 702         sdb_store_host_t host = {
 703                 name, last_update, interval, NULL, 0,
 704         };
 705         return store_host(&host, SDB_OBJ(store));
 706 } /* sdb_memstore_host */
 707
 708 int
 709 sdb_memstore_service(sdb_memstore_t *store, const char *hostname, const char *name,
 710                 sdb_time_t last_update, sdb_time_t interval)
 711 {
 712         sdb_store_service_t service = {
 713                 hostname, name, last_update, interval, NULL, 0,
 714         };
 715         return store_service(&service, SDB_OBJ(store));
 716 } /* sdb_memstore_service */
 717
 718 int
 719 sdb_memstore_metric(sdb_memstore_t *store, const char *hostname, const char *name,
 720                 sdb_metric_store_t *metric_store,
 721                 sdb_time_t last_update, sdb_time_t interval)
 722 {
 723         sdb_store_metric_t metric = {
 724                 hostname, name, { NULL, NULL }, last_update, interval, NULL, 0,
 725         };
 726         if (metric_store) {
 727                 metric.store.type = metric_store->type;
 728                 metric.store.id = metric_store->id;
 729         }
 730         return store_metric(&metric, SDB_OBJ(store));
 731 } /* sdb_memstore_metric */
 732
 733 int
 734 sdb_memstore_attribute(sdb_memstore_t *store, const char *hostname,
 735                 const char *key, const sdb_data_t *value,
 736                 sdb_time_t last_update, sdb_time_t interval)
 737 {
 738         sdb_store_attribute_t attr = {
 739                 NULL, SDB_HOST, hostname, key, SDB_DATA_INIT,
 740                 last_update, interval, NULL, 0,
 741         };
 742         if (value) {
 743                 attr.value = *value;
 744         }
 745         return store_attribute(&attr, SDB_OBJ(store));
 746 } /* sdb_memstore_attribute */
 747
 748 int
 749 sdb_memstore_service_attr(sdb_memstore_t *store, const char *hostname,
 750                 const char *service, const char *key, const sdb_data_t *value,
 751                 sdb_time_t last_update, sdb_time_t interval)
 752 {
 753         sdb_store_attribute_t attr = {
 754                 hostname, SDB_SERVICE, service, key, SDB_DATA_INIT,
 755                 last_update, interval, NULL, 0,
 756         };
 757         if (value) {
 758                 attr.value = *value;
 759         }
 760         return store_attribute(&attr, SDB_OBJ(store));
 761 } /* sdb_memstore_service_attr */
 762
 763 int
 764 sdb_memstore_metric_attr(sdb_memstore_t *store, const char *hostname,
 765                 const char *metric, const char *key, const sdb_data_t *value,
 766                 sdb_time_t last_update, sdb_time_t interval)
 767 {
 768         sdb_store_attribute_t attr = {
 769                 hostname, SDB_METRIC, metric, key, SDB_DATA_INIT,
 770                 last_update, interval, NULL, 0,
 771         };
 772         if (value) {
 773                 attr.value = *value;
 774         }
 775         return store_attribute(&attr, SDB_OBJ(store));
 776 } /* sdb_memstore_metric_attr */
 777
 778 sdb_memstore_obj_t *
 779 sdb_memstore_get_host(sdb_memstore_t *store, const char *name)
 780 {
 781         host_t *host;
 782
 783         if ((! store) || (! name))
 784                 return NULL;
 785
 786         host = HOST(sdb_avltree_lookup(store->hosts, name));
 787         if (! host)
 788                 return NULL;
 789
 790         return STORE_OBJ(host);
 791 } /* sdb_memstore_get_host */
 792
 793 sdb_memstore_obj_t *
 794 sdb_memstore_get_child(sdb_memstore_obj_t *obj, int type, const char *name)
 795 {
 796         sdb_avltree_t *children = NULL;
 797
 798         if ((! obj) || (! name))
 799                 return NULL;
 800
 801         if (type & SDB_ATTRIBUTE)
 802                 children = get_obj_attrs(obj);
 803         else if (obj->type == SDB_HOST)
 804                 children = get_host_children(HOST(obj), type);
 805         if (! children)
 806                 return NULL;
 807         return STORE_OBJ(sdb_avltree_lookup(children, name));
 808 } /* sdb_memstore_get_child */
 809
 810 int
 811 sdb_memstore_get_field(sdb_memstore_obj_t *obj, int field, sdb_data_t *res)
 812 {
 813         sdb_data_t tmp;
 814
 815         if (! obj)
 816                 return -1;
 817
 818         switch (field) {
 819                 case SDB_FIELD_NAME:
 820                         tmp.type = SDB_TYPE_STRING;
 821                         tmp.data.string = strdup(SDB_OBJ(obj)->name);
 822                         if (! tmp.data.string)
 823                                 return -1;
 824                         break;
 825                 case SDB_FIELD_LAST_UPDATE:
 826                         tmp.type = SDB_TYPE_DATETIME;
 827                         tmp.data.datetime = obj->last_update;
 828                         break;
 829                 case SDB_FIELD_AGE:
 830                         tmp.type = SDB_TYPE_DATETIME;
 831                         tmp.data.datetime = sdb_gettime() - obj->last_update;
 832                         break;
 833                 case SDB_FIELD_INTERVAL:
 834                         tmp.type = SDB_TYPE_DATETIME;
 835                         tmp.data.datetime = obj->interval;
 836                         break;
 837                 case SDB_FIELD_BACKEND:
 838                         if (! res)
 839                                 return 0;
 840                         tmp.type = SDB_TYPE_ARRAY | SDB_TYPE_STRING;
 841                         tmp.data.array.length = obj->backends_num;
 842                         tmp.data.array.values = obj->backends;
 843                         return sdb_data_copy(res, &tmp);
 844                 case SDB_FIELD_VALUE:
 845                         if (obj->type != SDB_ATTRIBUTE)
 846                                 return -1;
 847                         if (! res)
 848                                 return 0;
 849                         return sdb_data_copy(res, &ATTR(obj)->value);
 850                 case SDB_FIELD_TIMESERIES:
 851                         if (obj->type != SDB_METRIC)
 852                                 return -1;
 853                         tmp.type = SDB_TYPE_BOOLEAN;
 854                         tmp.data.boolean = METRIC(obj)->store.type != NULL;
 855                 default:
 856                         return -1;
 857         }
 858         if (res)
 859                 *res = tmp;
 860         else
 861                 sdb_data_free_datum(&tmp);
 862         return 0;
 863 } /* sdb_memstore_get_field */
 864
 865 int
 866 sdb_memstore_get_attr(sdb_memstore_obj_t *obj, const char *name, sdb_data_t *res,
 867                 sdb_memstore_matcher_t *filter)
 868 {
 869         sdb_memstore_obj_t *attr;
 870
 871         if ((! obj) || (! name))
 872                 return -1;
 873
 874         attr = STORE_OBJ(sdb_avltree_lookup(get_obj_attrs(obj), name));
 875         if (! attr)
 876                 return -1;
 877         if (filter && (! sdb_memstore_matcher_matches(filter, attr, NULL))) {
 878                 sdb_object_deref(SDB_OBJ(attr));
 879                 return -1;
 880         }
 881
 882         assert(STORE_OBJ(attr)->type == SDB_ATTRIBUTE);
 883         if (res)
 884                 sdb_data_copy(res, &ATTR(attr)->value);
 885         sdb_object_deref(SDB_OBJ(attr));
 886         return 0;
 887 } /* sdb_memstore_get_attr */
 888
 889 int
 890 sdb_memstore_scan(sdb_memstore_t *store, int type,
 891                 sdb_memstore_matcher_t *m, sdb_memstore_matcher_t *filter,
 892                 sdb_memstore_lookup_cb cb, void *user_data)
 893 {
 894         sdb_avltree_iter_t *host_iter = NULL;
 895         int status = 0;
 896
 897         if ((! store) || (! cb))
 898                 return -1;
 899
 900         if ((type != SDB_HOST) && (type != SDB_SERVICE) && (type != SDB_METRIC)) {
 901                 sdb_log(SDB_LOG_ERR, "memstore: Cannot scan objects of type %d", type);
 902                 return -1;
 903         }
 904
 905         pthread_rwlock_rdlock(&store->host_lock);
 906         host_iter = sdb_avltree_get_iter(store->hosts);
 907         if (! host_iter)
 908                 status = -1;
 909
 910         /* has_next returns false if the iterator is NULL */
 911         while (sdb_avltree_iter_has_next(host_iter)) {
 912                 sdb_memstore_obj_t *host;
 913                 sdb_avltree_iter_t *iter = NULL;
 914
 915                 host = STORE_OBJ(sdb_avltree_iter_get_next(host_iter));
 916                 assert(host);
 917
 918                 if (! sdb_memstore_matcher_matches(filter, host, NULL))
 919                         continue;
 920
 921                 if (type == SDB_SERVICE)
 922                         iter = sdb_avltree_get_iter(HOST(host)->services);
 923                 else if (type == SDB_METRIC)
 924                         iter = sdb_avltree_get_iter(HOST(host)->metrics);
 925
 926                 if (iter) {
 927                         while (sdb_avltree_iter_has_next(iter)) {
 928                                 sdb_memstore_obj_t *obj;
 929                                 obj = STORE_OBJ(sdb_avltree_iter_get_next(iter));
 930                                 assert(obj);
 931
 932                                 if (sdb_memstore_matcher_matches(m, obj, filter)) {
 933                                         if (cb(obj, filter, user_data)) {
 934                                                 sdb_log(SDB_LOG_ERR, "memstore: Callback returned "
 935                                                                 "an error while scanning");
 936                                                 status = -1;
 937                                                 break;
 938                                         }
 939                                 }
 940                         }
 941                 }
 942                 else if (sdb_memstore_matcher_matches(m, host, filter)) {
 943                         if (cb(host, filter, user_data)) {
 944                                 sdb_log(SDB_LOG_ERR, "memstore: Callback returned "
 945                                                 "an error while scanning");
 946                                 status = -1;
 947                         }
 948                 }
 949
 950                 sdb_avltree_iter_destroy(iter);
 951                 if (status)
 952                         break;
 953         }
 954
 955         sdb_avltree_iter_destroy(host_iter);
 956         pthread_rwlock_unlock(&store->host_lock);
 957         return status;
 958 } /* sdb_memstore_scan */
 959
 960 int
 961 sdb_memstore_emit(sdb_memstore_obj_t *obj, sdb_store_writer_t *w, sdb_object_t *wd)
 962 {
 963         if ((! obj) || (! w))
 964                 return -1;
 965
 966         switch (obj->type) {
 967         case SDB_HOST:
 968                 {
 969                         sdb_store_host_t host = {
 970                                 obj->_name,
 971                                 obj->last_update,
 972                                 obj->interval,
 973                                 (const char * const *)obj->backends,
 974                                 obj->backends_num,
 975                         };
 976                         if (! w->store_host)
 977                                 return -1;
 978                         return w->store_host(&host, wd);
 979                 }
 980         case SDB_SERVICE:
 981                 {
 982                         sdb_store_service_t service = {
 983                                 obj->parent ? obj->parent->_name : NULL,
 984                                 obj->_name,
 985                                 obj->last_update,
 986                                 obj->interval,
 987                                 (const char * const *)obj->backends,
 988                                 obj->backends_num,
 989                         };
 990                         if (! w->store_service)
 991                                 return -1;
 992                         return w->store_service(&service, wd);
 993                 }
 994         case SDB_METRIC:
 995                 {
 996                         sdb_store_metric_t metric = {
 997                                 obj->parent ? obj->parent->_name : NULL,
 998                                 obj->_name,
 999                                 {
1000                                         METRIC(obj)->store.type,
1001                                         METRIC(obj)->store.id,
1002                                 },
1003                                 obj->last_update,
1004                                 obj->interval,
1005                                 (const char * const *)obj->backends,
1006                                 obj->backends_num,
1007                         };
1008                         if (! w->store_metric)
1009                                 return -1;
1010                         return w->store_metric(&metric, wd);
1011                 }
1012         case SDB_ATTRIBUTE:
1013                 {
1014                         sdb_store_attribute_t attr = {
1015                                 NULL,
1016                                 obj->parent ? obj->parent->type : 0,
1017                                 obj->parent ? obj->parent->_name : NULL,
1018                                 obj->_name,
1019                                 ATTR(obj)->value,
1020                                 obj->last_update,
1021                                 obj->interval,
1022                                 (const char * const *)obj->backends,
1023                                 obj->backends_num,
1024                         };
1025                         if (obj->parent && (obj->parent->type != SDB_HOST)
1026                                         && obj->parent->parent)
1027                                 attr.hostname = obj->parent->parent->_name;
1028                         if (! w->store_attribute)
1029                                 return -1;
1030                         return w->store_attribute(&attr, wd);
1031                 }
1032         }
1033
1034         return -1;
1035 } /* sdb_memstore_emit */
1036
1037 int
1038 sdb_memstore_emit_full(sdb_memstore_obj_t *obj, sdb_memstore_matcher_t *filter,
1039                 sdb_store_writer_t *w, sdb_object_t *wd)
1040 {
1041         sdb_avltree_t *trees[] = { NULL, NULL, NULL };
1042         size_t i;
1043
1044         if (sdb_memstore_emit(obj, w, wd))
1045                 return -1;
1046
1047         if (obj->type == SDB_HOST) {
1048                 trees[0] = HOST(obj)->attributes;
1049                 trees[1] = HOST(obj)->metrics;
1050                 trees[2] = HOST(obj)->services;
1051         }
1052         else if (obj->type == SDB_SERVICE)
1053                 trees[0] = SVC(obj)->attributes;
1054         else if (obj->type == SDB_METRIC)
1055                 trees[0] = METRIC(obj)->attributes;
1056         else if (obj->type == SDB_ATTRIBUTE)
1057                 return 0;
1058         else
1059                 return -1;
1060
1061         for (i = 0; i < SDB_STATIC_ARRAY_LEN(trees); ++i) {
1062                 sdb_avltree_iter_t *iter;
1063
1064                 if (! trees[i])
1065                         continue;
1066
1067                 iter = sdb_avltree_get_iter(trees[i]);
1068                 while (sdb_avltree_iter_has_next(iter)) {
1069                         sdb_memstore_obj_t *child;
1070                         child = STORE_OBJ(sdb_avltree_iter_get_next(iter));
1071
1072                         if (filter && (! sdb_memstore_matcher_matches(filter, child, NULL)))
1073                                 continue;
1074
1075                         if (sdb_memstore_emit_full(child, filter, w, wd)) {
1076                                 sdb_avltree_iter_destroy(iter);
1077                                 return -1;
1078                         }
1079                 }
1080                 sdb_avltree_iter_destroy(iter);
1081         }
1082         return 0;
1083 } /* sdb_memstore_emit_full */
1084
1085 /* vim: set tw=78 sw=4 ts=4 noexpandtab : */
1086