src/rrdhost.c

   1 #define NETDATA_RRD_INTERNALS 1
   2 #include "common.h"
   3
   4 RRDHOST *localhost = NULL;
   5
   6 pthread_rwlock_t rrd_rwlock = PTHREAD_RWLOCK_INITIALIZER;
   7
   8
   9 // ----------------------------------------------------------------------------
  10 // RRDHOST index
  11
  12 int rrdhost_compare(void* a, void* b) {
  13     if(((RRDHOST *)a)->hash_machine_guid < ((RRDHOST *)b)->hash_machine_guid) return -1;
  14     else if(((RRDHOST *)a)->hash_machine_guid > ((RRDHOST *)b)->hash_machine_guid) return 1;
  15     else return strcmp(((RRDHOST *)a)->machine_guid, ((RRDHOST *)b)->machine_guid);
  16 }
  17
  18 avl_tree_lock rrdhost_root_index = {
  19         .avl_tree = { NULL, rrdhost_compare },
  20         .rwlock = AVL_LOCK_INITIALIZER
  21 };
  22
  23 RRDHOST *rrdhost_find(const char *guid, uint32_t hash) {
  24     debug(D_RRDHOST, "Searching in index for host with guid '%s'", guid);
  25
  26     RRDHOST tmp;
  27     strncpyz(tmp.machine_guid, guid, GUID_LEN);
  28     tmp.hash_machine_guid = (hash)?hash:simple_hash(tmp.machine_guid);
  29
  30     return (RRDHOST *)avl_search_lock(&(rrdhost_root_index), (avl *) &tmp);
  31 }
  32
  33 #define rrdhost_index_add(rrdhost) (RRDHOST *)avl_insert_lock(&(rrdhost_root_index), (avl *)(rrdhost))
  34 #define rrdhost_index_del(rrdhost) (RRDHOST *)avl_remove_lock(&(rrdhost_root_index), (avl *)(rrdhost))
  35
  36
  37 // ----------------------------------------------------------------------------
  38 // RRDHOST - internal helpers
  39
  40 static inline void rrdhost_init_hostname(RRDHOST *host, const char *hostname) {
  41     freez(host->hostname);
  42     host->hostname = strdupz(hostname);
  43     host->hash_hostname = simple_hash(host->hostname);
  44 }
  45
  46 static inline void rrdhost_init_os(RRDHOST *host, const char *os) {
  47     freez(host->os);
  48     host->os = strdupz(os?os:"unknown");
  49 }
  50
  51 static inline void rrdhost_init_machine_guid(RRDHOST *host, const char *machine_guid) {
  52     strncpy(host->machine_guid, machine_guid, GUID_LEN);
  53     host->machine_guid[GUID_LEN] = '\0';
  54     host->hash_machine_guid = simple_hash(host->machine_guid);
  55 }
  56
  57
  58 // ----------------------------------------------------------------------------
  59 // RRDHOST - add a host
  60
  61 RRDHOST *rrdhost_create(const char *hostname,
  62         const char *guid,
  63         const char *os,
  64         int update_every,
  65         int entries,
  66         RRD_MEMORY_MODE memory_mode,
  67         int health_enabled) {
  68
  69     debug(D_RRDHOST, "Host '%s': adding with guid '%s'", hostname, guid);
  70
  71     RRDHOST *host = callocz(1, sizeof(RRDHOST));
  72
  73     host->rrd_update_every    = update_every;
  74     host->rrd_history_entries = entries;
  75     host->rrd_memory_mode     = memory_mode;
  76     host->health_enabled      = (memory_mode == RRD_MEMORY_MODE_NONE)? 0 : health_enabled;
  77     host->rrdpush_enabled     = default_rrdpush_enabled;
  78     host->rrdpush_exclusive   = default_rrdpush_exclusive;
  79
  80     host->rrdpush_pipe[0] = -1;
  81     host->rrdpush_pipe[1] = -1;
  82     host->rrdpush_socket = -1;
  83
  84     pthread_mutex_init(&host->rrdpush_mutex, NULL);
  85     pthread_rwlock_init(&host->rrdhost_rwlock, NULL);
  86
  87     rrdhost_init_hostname(host, hostname);
  88     rrdhost_init_machine_guid(host, guid);
  89     rrdhost_init_os(host, os);
  90
  91     avl_init_lock(&(host->rrdset_root_index),      rrdset_compare);
  92     avl_init_lock(&(host->rrdset_root_index_name), rrdset_compare_name);
  93     avl_init_lock(&(host->rrdfamily_root_index),   rrdfamily_compare);
  94     avl_init_lock(&(host->variables_root_index),   rrdvar_compare);
  95
  96     // ------------------------------------------------------------------------
  97     // initialize health variables
  98
  99     host->health_log.next_log_id = 1;
 100     host->health_log.next_alarm_id = 1;
 101     host->health_log.max = 1000;
 102     host->health_log.next_log_id =
 103     host->health_log.next_alarm_id = (uint32_t)now_realtime_sec();
 104
 105     long n = config_get_number("health", "in memory max health log entries", host->health_log.max);
 106     if(n < 10) {
 107         error("Host '%s': health configuration has invalid max log entries %ld. Using default %u", host->hostname, n, host->health_log.max);
 108         config_set_number("health", "in memory max health log entries", (long)host->health_log.max);
 109     }
 110     else
 111         host->health_log.max = (unsigned int)n;
 112
 113     pthread_rwlock_init(&(host->health_log.alarm_log_rwlock), NULL);
 114
 115     char filename[FILENAME_MAX + 1];
 116
 117     if(!localhost) {
 118         // this is localhost
 119
 120         host->cache_dir  = strdupz(netdata_configured_cache_dir);
 121         host->varlib_dir = strdupz(netdata_configured_varlib_dir);
 122
 123     }
 124     else {
 125         // this is not localhost - append our GUID to localhost path
 126
 127         snprintfz(filename, FILENAME_MAX, "%s/%s", netdata_configured_cache_dir, host->machine_guid);
 128         host->cache_dir = strdupz(filename);
 129
 130         if(host->rrd_memory_mode == RRD_MEMORY_MODE_MAP || host->rrd_memory_mode == RRD_MEMORY_MODE_SAVE) {
 131             int r = mkdir(host->cache_dir, 0775);
 132             if(r != 0 && errno != EEXIST)
 133                 error("Host '%s': cannot create directory '%s'", host->hostname, host->cache_dir);
 134         }
 135
 136         snprintfz(filename, FILENAME_MAX, "%s/%s", netdata_configured_varlib_dir, host->machine_guid);
 137         host->varlib_dir = strdupz(filename);
 138
 139         if(host->health_enabled) {
 140             int r = mkdir(host->varlib_dir, 0775);
 141             if(r != 0 && errno != EEXIST)
 142                 error("Host '%s': cannot create directory '%s'", host->hostname, host->varlib_dir);
 143
 144             snprintfz(filename, FILENAME_MAX, "%s/health", host->varlib_dir);
 145             r = mkdir(filename, 0775);
 146             if(r != 0 && errno != EEXIST)
 147                 error("Host '%s': cannot create directory '%s'", host->hostname, filename);
 148         }
 149
 150     }
 151
 152     snprintfz(filename, FILENAME_MAX, "%s/health/health-log.db", host->varlib_dir);
 153     host->health_log_filename = strdupz(config_get("health", "health db file", filename));
 154
 155     snprintfz(filename, FILENAME_MAX, "%s/alarm-notify.sh", netdata_configured_plugins_dir);
 156     host->health_default_exec = strdupz(config_get("health", "script to execute on alarm", filename));
 157     host->health_default_recipient = strdup("root");
 158
 159
 160     // ------------------------------------------------------------------------
 161     // load health configuration
 162
 163     if(host->health_enabled) {
 164         health_alarm_log_load(host);
 165         health_alarm_log_open(host);
 166
 167         rrdhost_wrlock(host);
 168         health_readdir(host, health_config_dir());
 169         rrdhost_unlock(host);
 170     }
 171
 172
 173     // ------------------------------------------------------------------------
 174     // link it and add it to the index
 175
 176     rrd_wrlock();
 177
 178     if(localhost) {
 179         host->next = localhost->next;
 180         localhost->next = host;
 181     }
 182
 183     if(rrdhost_index_add(host) != host)
 184         fatal("Host '%s': cannot add host to index. It already exists.", hostname);
 185
 186     rrd_unlock();
 187
 188     debug(D_RRDHOST, "Host '%s', added with guid '%s'", host->hostname, host->machine_guid);
 189     return host;
 190 }
 191
 192 RRDHOST *rrdhost_find_or_create(const char *hostname, const char *guid, const char *os, int update_every, int history, RRD_MEMORY_MODE mode, int health_enabled) {
 193     debug(D_RRDHOST, "Searching for host '%s' with guid '%s'", hostname, guid);
 194
 195     RRDHOST *host = rrdhost_find(guid, 0);
 196     if(!host) {
 197         host = rrdhost_create(hostname, guid, os, update_every, history, mode, health_enabled);
 198     }
 199     else {
 200         host->health_enabled = health_enabled;
 201
 202         if(strcmp(host->hostname, hostname)) {
 203             char *t = host->hostname;
 204             char *n = strdupz(hostname);
 205             host->hostname = n;
 206             freez(t);
 207         }
 208
 209         if(host->rrd_update_every != update_every)
 210             error("Host '%s' has an update frequency of %d seconds, but the wanted one is %d seconds.", host->hostname, host->rrd_update_every, update_every);
 211
 212         if(host->rrd_history_entries != history)
 213             error("Host '%s' has history of %d entries, but the wanted one is %d entries.", host->hostname, host->rrd_history_entries, history);
 214
 215         if(host->rrd_memory_mode != mode)
 216             error("Host '%s' has memory mode '%s', but the wanted one is '%s'.", host->hostname, rrd_memory_mode_name(host->rrd_memory_mode), rrd_memory_mode_name(mode));
 217     }
 218
 219     return host;
 220 }
 221
 222 // ----------------------------------------------------------------------------
 223 // RRDHOST global / startup initialization
 224
 225 void rrd_init(char *hostname) {
 226     debug(D_RRDHOST, "Initializing localhost with hostname '%s'", hostname);
 227
 228     localhost = rrdhost_create(hostname,
 229             registry_get_this_machine_guid(),
 230             os_type,
 231             default_rrd_update_every,
 232             default_rrd_history_entries,
 233             default_rrd_memory_mode,
 234             default_health_enabled
 235     );
 236 }
 237
 238 // ----------------------------------------------------------------------------
 239 // RRDHOST - lock validations
 240 // there are only used when NETDATA_INTERNAL_CHECKS is set
 241
 242 void rrdhost_check_rdlock_int(RRDHOST *host, const char *file, const char *function, const unsigned long line) {
 243     debug(D_RRDHOST, "Checking read lock on host '%s'", host->hostname);
 244
 245     int ret = pthread_rwlock_trywrlock(&host->rrdhost_rwlock);
 246     if(ret == 0)
 247         fatal("RRDHOST '%s' should be read-locked, but it is not, at function %s() at line %lu of file '%s'", host->hostname, function, line, file);
 248 }
 249
 250 void rrdhost_check_wrlock_int(RRDHOST *host, const char *file, const char *function, const unsigned long line) {
 251     debug(D_RRDHOST, "Checking write lock on host '%s'", host->hostname);
 252
 253     int ret = pthread_rwlock_tryrdlock(&host->rrdhost_rwlock);
 254     if(ret == 0)
 255         fatal("RRDHOST '%s' should be write-locked, but it is not, at function %s() at line %lu of file '%s'", host->hostname, function, line, file);
 256 }
 257
 258 void rrd_check_rdlock_int(const char *file, const char *function, const unsigned long line) {
 259     debug(D_RRDHOST, "Checking read lock on all RRDs");
 260
 261     int ret = pthread_rwlock_trywrlock(&rrd_rwlock);
 262     if(ret == 0)
 263         fatal("RRDs should be read-locked, but it are not, at function %s() at line %lu of file '%s'", function, line, file);
 264 }
 265
 266 void rrd_check_wrlock_int(const char *file, const char *function, const unsigned long line) {
 267     debug(D_RRDHOST, "Checking write lock on all RRDs");
 268
 269     int ret = pthread_rwlock_tryrdlock(&rrd_rwlock);
 270     if(ret == 0)
 271         fatal("RRDs should be write-locked, but it are not, at function %s() at line %lu of file '%s'", function, line, file);
 272 }
 273
 274 // ----------------------------------------------------------------------------
 275 // RRDHOST - free
 276
 277 void rrdhost_free(RRDHOST *host) {
 278     if(!host) return;
 279
 280     info("Freeing all memory for host '%s'...", host->hostname);
 281
 282     rrd_check_wrlock();     // make sure the RRDs are write locked
 283     rrdhost_wrlock(host);   // lock this RRDHOST
 284
 285     // ------------------------------------------------------------------------
 286     // release its children resources
 287
 288     while(host->rrdset_root) rrdset_free(host->rrdset_root);
 289
 290     while(host->alarms) rrdcalc_free(host, host->alarms);
 291     while(host->templates) rrdcalctemplate_free(host, host->templates);
 292     health_alarm_log_free(host);
 293
 294
 295     // ------------------------------------------------------------------------
 296     // remove it from the indexes
 297
 298     if(rrdhost_index_del(host) != host)
 299         error("RRDHOST '%s' removed from index, deleted the wrong entry.", host->hostname);
 300
 301
 302     // ------------------------------------------------------------------------
 303     // unlink it from the host
 304
 305     if(host == localhost) {
 306         localhost = host->next;
 307     }
 308     else {
 309         // find the previous one
 310         RRDHOST *h;
 311         for(h = localhost; h && h->next != host ; h = h->next) ;
 312
 313         // bypass it
 314         if(h) h->next = host->next;
 315         else error("Request to free RRDHOST '%s': cannot find it", host->hostname);
 316     }
 317
 318     // ------------------------------------------------------------------------
 319     // free it
 320
 321     if(host->rrdpush_spawn) {
 322         pthread_cancel(host->rrdpush_thread);
 323         rrdpush_sender_cleanup(host);
 324     }
 325
 326     freez(host->os);
 327     freez(host->cache_dir);
 328     freez(host->varlib_dir);
 329     freez(host->health_default_exec);
 330     freez(host->health_default_recipient);
 331     freez(host->health_log_filename);
 332     freez(host->hostname);
 333     rrdhost_unlock(host);
 334     freez(host);
 335
 336     info("Host memory cleanup completed...");
 337 }
 338
 339 void rrdhost_free_all(void) {
 340     rrd_wrlock();
 341     while(localhost) rrdhost_free(localhost);
 342     rrd_unlock();
 343 }
 344
 345 // ----------------------------------------------------------------------------
 346 // RRDHOST - save
 347
 348 void rrdhost_save(RRDHOST *host) {
 349     if(!host) return;
 350
 351     info("Saving host '%s' database...", host->hostname);
 352
 353     RRDSET *st;
 354     RRDDIM *rd;
 355
 356     // we get a write lock
 357     // to ensure only one thread is saving the database
 358     rrdhost_wrlock(host);
 359
 360     rrdset_foreach_write(st, host) {
 361         rrdset_rdlock(st);
 362
 363         if(st->rrd_memory_mode == RRD_MEMORY_MODE_SAVE) {
 364             debug(D_RRD_STATS, "Saving stats '%s' to '%s'.", st->name, st->cache_filename);
 365             savememory(st->cache_filename, st, st->memsize);
 366         }
 367
 368         rrddim_foreach_read(rd, st) {
 369             if(likely(rd->rrd_memory_mode == RRD_MEMORY_MODE_SAVE)) {
 370                 debug(D_RRD_STATS, "Saving dimension '%s' to '%s'.", rd->name, rd->cache_filename);
 371                 savememory(rd->cache_filename, rd, rd->memsize);
 372             }
 373         }
 374
 375         rrdset_unlock(st);
 376     }
 377
 378     rrdhost_unlock(host);
 379 }
 380
 381 void rrdhost_save_all(void) {
 382     info("Saving database...");
 383
 384     rrd_rdlock();
 385
 386     RRDHOST *host;
 387     rrdhost_foreach_read(host)
 388         rrdhost_save(host);
 389
 390     rrd_unlock();
 391 }