src/core/store.c

   1 /*
   2  * SysDB - src/core/store.c
   3  * Copyright (C) 2012 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 #include "sysdb.h"
  29 #include "core/store.h"
  30 #include "core/error.h"
  31 #include "core/plugin.h"
  32 #include "utils/llist.h"
  33
  34 #include <assert.h>
  35
  36 #include <errno.h>
  37
  38 #include <stdio.h>
  39 #include <stdlib.h>
  40 #include <string.h>
  41
  42 #include <pthread.h>
  43
  44 /*
  45  * private variables
  46  */
  47
  48 static sdb_llist_t *host_list = NULL;
  49 static pthread_rwlock_t host_lock = PTHREAD_RWLOCK_INITIALIZER;
  50
  51 /*
  52  * private types
  53  */
  54
  55 static sdb_type_t sdb_host_type;
  56 static sdb_type_t sdb_attribute_type;
  57 static sdb_type_t sdb_service_type;
  58
  59 typedef struct {
  60         sdb_object_t super;
  61         sdb_time_t last_update;
  62 } sdb_store_obj_t;
  63 #define SDB_STORE_OBJ(obj) ((sdb_store_obj_t *)(obj))
  64 #define SDB_CONST_STORE_OBJ(obj) ((const sdb_store_obj_t *)(obj))
  65
  66 typedef struct {
  67         sdb_store_obj_t super;
  68
  69         char *hostname;
  70 } sdb_service_t;
  71 #define SDB_SVC(obj) ((sdb_service_t *)(obj))
  72 #define SDB_CONST_SVC(obj) ((const sdb_service_t *)(obj))
  73
  74 typedef struct {
  75         sdb_store_obj_t super;
  76
  77         char *attr_value;
  78         char *hostname;
  79 } sdb_attribute_t;
  80 #define SDB_ATTR(obj) ((sdb_attribute_t *)(obj))
  81 #define SDB_CONST_ATTR(obj) ((const sdb_attribute_t *)(obj))
  82
  83 typedef struct {
  84         sdb_store_obj_t super;
  85
  86         sdb_llist_t *attributes;
  87         sdb_llist_t *services;
  88 } sdb_host_t;
  89 #define SDB_HOST(obj) ((sdb_host_t *)(obj))
  90 #define SDB_CONST_HOST(obj) ((const sdb_host_t *)(obj))
  91
  92 /* shortcuts for accessing the sdb_store_obj_t attributes of inheriting
  93  * objects */
  94 #define _last_update super.last_update
  95
  96 static int
  97 sdb_host_init(sdb_object_t *obj, va_list __attribute__((unused)) ap)
  98 {
  99         SDB_HOST(obj)->_last_update = sdb_gettime();
 100         /* ignore errors -> last_update will be updated later */
 101
 102         SDB_HOST(obj)->attributes = sdb_llist_create();
 103         if (! SDB_HOST(obj)->attributes)
 104                 return -1;
 105         SDB_HOST(obj)->services = sdb_llist_create();
 106         if (! SDB_HOST(obj)->services)
 107                 return -1;
 108         return 0;
 109 } /* sdb_host_init */
 110
 111 static void
 112 sdb_host_destroy(sdb_object_t *obj)
 113 {
 114         assert(obj);
 115
 116         if (SDB_HOST(obj)->attributes)
 117                 sdb_llist_destroy(SDB_HOST(obj)->attributes);
 118         if (SDB_HOST(obj)->services)
 119                 sdb_llist_destroy(SDB_HOST(obj)->services);
 120 } /* sdb_host_destroy */
 121
 122 static sdb_object_t *
 123 sdb_host_clone(const sdb_object_t *obj)
 124 {
 125         const sdb_host_t *host = (const sdb_host_t *)obj;
 126         sdb_host_t *new;
 127
 128         new = SDB_HOST(sdb_object_create(obj->name, sdb_host_type));
 129         if (! new)
 130                 return NULL;
 131
 132         /* make sure these are initialized; else sdb_object_deref() might access
 133          * arbitrary memory in case of an error */
 134         new->services = new->attributes = NULL;
 135
 136         if (host->attributes) {
 137                 new->attributes = sdb_llist_clone(host->attributes);
 138                 if (! new->attributes) {
 139                         sdb_object_deref(SDB_OBJ(new));
 140                         return NULL;
 141                 }
 142         }
 143
 144         new->_last_update = host->_last_update;
 145         if (host->services) {
 146                 new->services = sdb_llist_clone(host->services);
 147                 if (! new->services) {
 148                         sdb_object_deref(SDB_OBJ(new));
 149                         return NULL;
 150                 }
 151         }
 152         return SDB_OBJ(new);
 153 } /* sdb_host_clone */
 154
 155 static int
 156 sdb_attr_init(sdb_object_t *obj, va_list ap)
 157 {
 158         const char *hostname = va_arg(ap, const char *);
 159         const char *value = va_arg(ap, const char *);
 160
 161         SDB_ATTR(obj)->hostname = strdup(hostname);
 162         SDB_ATTR(obj)->attr_value = strdup(value);
 163         if ((! SDB_ATTR(obj)->hostname) || (! SDB_ATTR(obj)->attr_value))
 164                 return -1;
 165
 166         SDB_ATTR(obj)->_last_update = sdb_gettime();
 167         return 0;
 168 } /* sdb_attr_init */
 169
 170 static void
 171 sdb_attr_destroy(sdb_object_t *obj)
 172 {
 173         assert(obj);
 174
 175         if (SDB_ATTR(obj)->hostname)
 176                 free(SDB_ATTR(obj)->hostname);
 177         if (SDB_ATTR(obj)->attr_value)
 178                 free(SDB_ATTR(obj)->attr_value);
 179 } /* sdb_attr_destroy */
 180
 181 static sdb_object_t *
 182 sdb_attr_clone(const sdb_object_t *obj)
 183 {
 184         const sdb_attribute_t *attr = (const sdb_attribute_t *)obj;
 185         sdb_attribute_t *new;
 186
 187         new = SDB_ATTR(sdb_object_create(obj->name, sdb_attribute_type,
 188                                 attr->hostname, attr->attr_value));
 189         if (! new)
 190                 return NULL;
 191
 192         new->_last_update = attr->_last_update;
 193         return SDB_OBJ(new);
 194 } /* sdb_attr_clone */
 195
 196 static int
 197 sdb_svc_init(sdb_object_t *obj, va_list ap)
 198 {
 199         const char *hostname = va_arg(ap, const char *);
 200
 201         SDB_SVC(obj)->hostname = strdup(hostname);
 202         if (! SDB_SVC(obj)->hostname)
 203                 return -1;
 204
 205         SDB_SVC(obj)->_last_update = sdb_gettime();
 206         /* ignore errors -> last_update will be updated later */
 207         return 0;
 208 } /* sdb_svc_init */
 209
 210 static void
 211 sdb_svc_destroy(sdb_object_t *obj)
 212 {
 213         assert(obj);
 214
 215         if (SDB_SVC(obj)->hostname)
 216                 free(SDB_SVC(obj)->hostname);
 217 } /* sdb_svc_destroy */
 218
 219 static sdb_object_t *
 220 sdb_svc_clone(const sdb_object_t *obj)
 221 {
 222         const sdb_service_t *svc = (const sdb_service_t *)obj;
 223         sdb_service_t *new;
 224
 225         new = SDB_SVC(sdb_object_create(obj->name, sdb_service_type,
 226                                 svc->hostname));
 227         if (! new)
 228                 return NULL;
 229
 230         new->_last_update = svc->_last_update;
 231         return SDB_OBJ(new);
 232 } /* sdb_svc_clone */
 233
 234 static sdb_type_t sdb_host_type = {
 235         sizeof(sdb_host_t),
 236
 237         sdb_host_init,
 238         sdb_host_destroy,
 239         sdb_host_clone
 240 };
 241
 242 static sdb_type_t sdb_attribute_type = {
 243         sizeof(sdb_attribute_t),
 244
 245         sdb_attr_init,
 246         sdb_attr_destroy,
 247         sdb_attr_clone
 248 };
 249
 250 static sdb_type_t sdb_service_type = {
 251         sizeof(sdb_service_t),
 252
 253         sdb_svc_init,
 254         sdb_svc_destroy,
 255         sdb_svc_clone
 256 };
 257
 258 /*
 259  * public API
 260  */
 261
 262 int
 263 sdb_store_host(const char *name, sdb_time_t last_update)
 264 {
 265         sdb_host_t *old;
 266
 267         char *cname;
 268         int status = 0;
 269
 270         if (! name)
 271                 return -1;
 272
 273         cname = sdb_plugin_cname(strdup(name));
 274         if (! cname) {
 275                 sdb_log(SDB_LOG_ERR, "store: strdup failed");
 276                 return -1;
 277         }
 278
 279         if (last_update <= 0)
 280                 last_update = sdb_gettime();
 281
 282         pthread_rwlock_wrlock(&host_lock);
 283
 284         if (! host_list) {
 285                 if (! (host_list = sdb_llist_create())) {
 286                         pthread_rwlock_unlock(&host_lock);
 287                         return -1;
 288                 }
 289         }
 290
 291         old = SDB_HOST(sdb_llist_search_by_name(host_list, cname));
 292
 293         if (old) {
 294                 if (old->_last_update > last_update) {
 295                         sdb_log(SDB_LOG_DEBUG, "store: Cannot update host '%s' - "
 296                                         "value too old (%"PRIscTIME" < %"PRIscTIME")",
 297                                         cname, last_update, old->_last_update);
 298                         /* don't report an error; the host may be updated by multiple
 299                          * backends */
 300                         status = 1;
 301                 }
 302                 else {
 303                         old->_last_update = last_update;
 304                 }
 305         }
 306         else {
 307                 sdb_host_t *new = SDB_HOST(sdb_object_create(name, sdb_host_type));
 308                 if (! new) {
 309                         char errbuf[1024];
 310                         sdb_log(SDB_LOG_ERR, "store: Failed to clone host object: %s",
 311                                         sdb_strerror(errno, errbuf, sizeof(errbuf)));
 312                         pthread_rwlock_unlock(&host_lock);
 313                         return -1;
 314                 }
 315
 316                 free(SDB_OBJ(new)->name);
 317                 SDB_OBJ(new)->name = cname;
 318
 319                 status = sdb_llist_insert_sorted(host_list, SDB_OBJ(new),
 320                                 sdb_object_cmp_by_name);
 321
 322                 /* pass control to the list or destroy in case of an error */
 323                 sdb_object_deref(SDB_OBJ(new));
 324         }
 325
 326         pthread_rwlock_unlock(&host_lock);
 327         return status;
 328 } /* sdb_store_host */
 329
 330 _Bool
 331 sdb_store_has_host(const char *name)
 332 {
 333         sdb_host_t *host;
 334
 335         if (! name)
 336                 return NULL;
 337
 338         host = SDB_HOST(sdb_llist_search_by_name(host_list, name));
 339         return host != NULL;
 340 } /* sdb_store_has_host */
 341
 342 int
 343 sdb_store_attribute(const char *hostname, const char *key, const char *value,
 344                 sdb_time_t last_update)
 345 {
 346         sdb_host_t *host;
 347         sdb_attribute_t *old;
 348
 349         int status = 0;
 350
 351         if ((! hostname) || (! key))
 352                 return -1;
 353
 354         if (last_update <= 0)
 355                 last_update = sdb_gettime();
 356
 357         if (! host_list)
 358                 return -1;
 359
 360         pthread_rwlock_wrlock(&host_lock);
 361
 362         host = SDB_HOST(sdb_llist_search_by_name(host_list, hostname));
 363         if (! host) {
 364                 pthread_rwlock_unlock(&host_lock);
 365                 return -1;
 366         }
 367
 368         old = SDB_ATTR(sdb_llist_search_by_name(host->attributes, key));
 369         if (old) {
 370                 if (old->_last_update > last_update) {
 371                         sdb_log(SDB_LOG_DEBUG, "store: Cannot update attribute "
 372                                         "'%s/%s' - value too old (%"PRIscTIME" < %"PRIscTIME")",
 373                                         hostname, key, last_update, old->_last_update);
 374                         status = 1;
 375                 }
 376                 else {
 377                         old->_last_update = last_update;
 378                 }
 379         }
 380         else {
 381                 sdb_attribute_t *new = SDB_ATTR(sdb_object_create(key,
 382                                         sdb_attribute_type, hostname, value));
 383                 if (! new) {
 384                         char errbuf[1024];
 385                         sdb_log(SDB_LOG_ERR, "store: Failed to clone attribute "
 386                                         "object: %s", sdb_strerror(errno, errbuf, sizeof(errbuf)));
 387                         pthread_rwlock_unlock(&host_lock);
 388                         return -1;
 389                 }
 390
 391                 status = sdb_llist_insert_sorted(host->attributes, SDB_OBJ(new),
 392                                 sdb_object_cmp_by_name);
 393
 394                 /* pass control to the list or destroy in case of an error */
 395                 sdb_object_deref(SDB_OBJ(new));
 396         }
 397
 398         pthread_rwlock_unlock(&host_lock);
 399         return status;
 400 } /* sdb_store_attribute */
 401
 402 int
 403 sdb_store_service(const char *hostname, const char *name,
 404                 sdb_time_t last_update)
 405 {
 406         sdb_host_t *host;
 407         sdb_service_t *old;
 408
 409         int status = 0;
 410
 411         if ((! hostname) || (! name))
 412                 return -1;
 413
 414         if (last_update <= 0)
 415                 last_update = sdb_gettime();
 416
 417         if (! host_list)
 418                 return -1;
 419
 420         pthread_rwlock_wrlock(&host_lock);
 421
 422         host = SDB_HOST(sdb_llist_search_by_name(host_list, hostname));
 423         if (! host) {
 424                 pthread_rwlock_unlock(&host_lock);
 425                 return -1;
 426         }
 427
 428         old = SDB_SVC(sdb_llist_search_by_name(host->services, name));
 429         if (old) {
 430                 if (old->_last_update > last_update) {
 431                         sdb_log(SDB_LOG_DEBUG, "store: Cannot update service "
 432                                         "'%s/%s' - value too old (%"PRIscTIME" < %"PRIscTIME")",
 433                                         hostname, name, last_update, old->_last_update);
 434                         status = 1;
 435                 }
 436                 else {
 437                         old->_last_update = last_update;
 438                 }
 439         }
 440         else {
 441                 sdb_service_t *new = SDB_SVC(sdb_object_create(name, sdb_service_type,
 442                                         hostname));
 443                 if (! new) {
 444                         char errbuf[1024];
 445                         sdb_log(SDB_LOG_ERR, "store: Failed to clone service "
 446                                         "object: %s", sdb_strerror(errno, errbuf, sizeof(errbuf)));
 447                         pthread_rwlock_unlock(&host_lock);
 448                         return -1;
 449                 }
 450
 451                 status = sdb_llist_insert_sorted(host->services, SDB_OBJ(new),
 452                                 sdb_object_cmp_by_name);
 453
 454                 /* pass control to the list or destroy in case of an error */
 455                 sdb_object_deref(SDB_OBJ(new));
 456         }
 457
 458         pthread_rwlock_unlock(&host_lock);
 459         return status;
 460 } /* sdb_store_service */
 461
 462 int
 463 sdb_store_dump(FILE *fh)
 464 {
 465         sdb_llist_iter_t *host_iter;
 466
 467         if (! fh)
 468                 return -1;
 469
 470         pthread_rwlock_rdlock(&host_lock);
 471
 472         host_iter = sdb_llist_get_iter(host_list);
 473         if (! host_iter) {
 474                 pthread_rwlock_unlock(&host_lock);
 475                 return -1;
 476         }
 477
 478         while (sdb_llist_iter_has_next(host_iter)) {
 479                 sdb_host_t *host = SDB_HOST(sdb_llist_iter_get_next(host_iter));
 480                 sdb_llist_iter_t *svc_iter;
 481                 sdb_llist_iter_t *attr_iter;
 482
 483                 char time_str[64];
 484
 485                 assert(host);
 486
 487                 if (! sdb_strftime(time_str, sizeof(time_str),
 488                                         "%F %T %z", host->_last_update))
 489                         snprintf(time_str, sizeof(time_str), "<error>");
 490                 time_str[sizeof(time_str) - 1] = '\0';
 491
 492                 fprintf(fh, "Host '%s' (last updated: %s):\n",
 493                                 SDB_OBJ(host)->name, time_str);
 494
 495                 attr_iter = sdb_llist_get_iter(host->attributes);
 496                 if (! attr_iter) {
 497                         char errbuf[1024];
 498                         fprintf(fh, "Failed to retrieve attributes: %s\n",
 499                                         sdb_strerror(errno, errbuf, sizeof(errbuf)));
 500                         continue;
 501                 }
 502
 503                 while (sdb_llist_iter_has_next(attr_iter)) {
 504                         sdb_attribute_t *attr = SDB_ATTR(sdb_llist_iter_get_next(attr_iter));
 505                         assert(attr);
 506
 507                         if (! sdb_strftime(time_str, sizeof(time_str),
 508                                                 "%F %T %z", attr->_last_update))
 509                                 snprintf(time_str, sizeof(time_str), "<error>");
 510                         time_str[sizeof(time_str) - 1] = '\0';
 511
 512                         fprintf(fh, "\tAttribute '%s' -> '%s' (last updated: %s)\n",
 513                                         SDB_OBJ(attr)->name, attr->attr_value, time_str);
 514                 }
 515
 516                 sdb_llist_iter_destroy(attr_iter);
 517
 518                 svc_iter = sdb_llist_get_iter(host->services);
 519                 if (! svc_iter) {
 520                         char errbuf[1024];
 521                         fprintf(fh, "Failed to retrieve services: %s\n",
 522                                         sdb_strerror(errno, errbuf, sizeof(errbuf)));
 523                         continue;
 524                 }
 525
 526                 while (sdb_llist_iter_has_next(svc_iter)) {
 527                         sdb_service_t *svc = SDB_SVC(sdb_llist_iter_get_next(svc_iter));
 528                         assert(svc);
 529
 530                         if (! sdb_strftime(time_str, sizeof(time_str),
 531                                                 "%F %T %z", svc->_last_update))
 532                                 snprintf(time_str, sizeof(time_str), "<error>");
 533                         time_str[sizeof(time_str) - 1] = '\0';
 534
 535                         fprintf(fh, "\tService '%s' (last updated: %s)\n",
 536                                         SDB_OBJ(svc)->name, time_str);
 537                 }
 538
 539                 sdb_llist_iter_destroy(svc_iter);
 540         }
 541
 542         sdb_llist_iter_destroy(host_iter);
 543         pthread_rwlock_unlock(&host_lock);
 544         return 0;
 545 } /* sdb_store_dump */
 546
 547 /* vim: set tw=78 sw=4 ts=4 noexpandtab : */
 548