src/rrdhost.c

   1 #define NETDATA_RRD_INTERNALS 1
   2 #include "common.h"
   3
   4 RRDHOST *localhost = NULL;
   5
   6 // ----------------------------------------------------------------------------
   7 // RRDHOST index
   8
   9 int rrdhost_compare(void* a, void* b) {
  10     if(((RRDHOST *)a)->hash_machine_guid < ((RRDHOST *)b)->hash_machine_guid) return -1;
  11     else if(((RRDHOST *)a)->hash_machine_guid > ((RRDHOST *)b)->hash_machine_guid) return 1;
  12     else return strcmp(((RRDHOST *)a)->machine_guid, ((RRDHOST *)b)->machine_guid);
  13 }
  14
  15 avl_tree_lock rrdhost_root_index = {
  16         .avl_tree = { NULL, rrdhost_compare },
  17         .rwlock = AVL_LOCK_INITIALIZER
  18 };
  19
  20 RRDHOST *rrdhost_find(const char *guid, uint32_t hash) {
  21     debug(D_RRDHOST, "Searching in index for host with guid '%s'", guid);
  22
  23     RRDHOST tmp;
  24     strncpyz(tmp.machine_guid, guid, GUID_LEN);
  25     tmp.hash_machine_guid = (hash)?hash:simple_hash(tmp.machine_guid);
  26
  27     return (RRDHOST *)avl_search_lock(&(rrdhost_root_index), (avl *) &tmp);
  28 }
  29
  30 #define rrdhost_index_add(rrdhost) (RRDHOST *)avl_insert_lock(&(rrdhost_root_index), (avl *)(rrdhost))
  31 #define rrdhost_index_del(rrdhost) (RRDHOST *)avl_remove_lock(&(rrdhost_root_index), (avl *)(rrdhost))
  32
  33
  34 // ----------------------------------------------------------------------------
  35 // RRDHOST - internal helpers
  36
  37 static inline void rrdhost_init_hostname(RRDHOST *host, const char *hostname) {
  38     freez(host->hostname);
  39     host->hostname = strdupz(hostname);
  40     host->hash_hostname = simple_hash(host->hostname);
  41 }
  42
  43 static inline void rrdhost_init_machine_guid(RRDHOST *host, const char *machine_guid) {
  44     strncpy(host->machine_guid, machine_guid, GUID_LEN);
  45     host->machine_guid[GUID_LEN] = '\0';
  46     host->hash_machine_guid = simple_hash(host->machine_guid);
  47 }
  48
  49 // ----------------------------------------------------------------------------
  50 // RRDHOST - add a host
  51
  52 RRDHOST *rrdhost_create(const char *hostname, const char *guid) {
  53     debug(D_RRDHOST, "Adding host '%s' with guid '%s'", hostname, guid);
  54
  55     RRDHOST *host = callocz(1, sizeof(RRDHOST));
  56
  57     host->rrd_update_every    = default_localhost_rrd_update_every;
  58     host->rrd_history_entries = default_localhost_rrd_history_entries;
  59     host->rrd_memory_mode     = default_localhost_rrd_memory_mode;
  60     host->health_enabled      = default_localhost_health_enabled;
  61
  62     pthread_rwlock_init(&(host->rrdset_root_rwlock), NULL);
  63
  64     rrdhost_init_hostname(host, hostname);
  65     rrdhost_init_machine_guid(host, guid);
  66
  67     avl_init_lock(&(host->rrdset_root_index), rrdset_compare);
  68     avl_init_lock(&(host->rrdset_root_index_name), rrdset_compare_name);
  69     avl_init_lock(&(host->rrdfamily_root_index), rrdfamily_compare);
  70     avl_init_lock(&(host->variables_root_index), rrdvar_compare);
  71
  72
  73     // ------------------------------------------------------------------------
  74     // initialize health variables
  75
  76     host->health_log.next_log_id = 1;
  77     host->health_log.next_alarm_id = 1;
  78     host->health_log.max = 1000;
  79     host->health_log.next_log_id =
  80     host->health_log.next_alarm_id = (uint32_t)now_realtime_sec();
  81
  82     long n = config_get_number("health", "in memory max health log entries", host->health_log.max);
  83     if(n < 10) {
  84         error("Health configuration has invalid max log entries %ld. Using default %u", n, host->health_log.max);
  85         config_set_number("health", "in memory max health log entries", (long)host->health_log.max);
  86     }
  87     else
  88         host->health_log.max = (unsigned int)n;
  89
  90     pthread_rwlock_init(&(host->health_log.alarm_log_rwlock), NULL);
  91
  92     char filename[FILENAME_MAX + 1];
  93
  94     if(!localhost) {
  95         // this is localhost
  96
  97         host->cache_dir = strdupz(netdata_configured_cache_dir);
  98         host->varlib_dir = strdupz(netdata_configured_varlib_dir);
  99
 100         snprintfz(filename, FILENAME_MAX, "%s/health/health-log.db", host->varlib_dir);
 101         host->health_log_filename = strdupz(config_get("health", "health db file", filename));
 102
 103     }
 104     else {
 105         // this is not localhost - append our GUID to localhost path
 106
 107         snprintfz(filename, FILENAME_MAX, "%s/%s", netdata_configured_cache_dir, host->machine_guid);
 108         host->cache_dir = strdupz(filename);
 109
 110         if(host->rrd_memory_mode == RRD_MEMORY_MODE_MAP || host->rrd_memory_mode == RRD_MEMORY_MODE_SAVE) {
 111             int r = mkdir(host->cache_dir, 0775);
 112             if(r != 0 && errno != EEXIST)
 113                 error("Cannot create directory '%s'", host->cache_dir);
 114         }
 115
 116         snprintfz(filename, FILENAME_MAX, "%s/%s", netdata_configured_varlib_dir, host->machine_guid);
 117         host->varlib_dir = strdupz(filename);
 118
 119         if(host->health_enabled) {
 120             int r = mkdir(host->varlib_dir, 0775);
 121             if(r != 0 && errno != EEXIST)
 122                 error("Cannot create directory '%s'", host->varlib_dir);
 123         }
 124
 125         snprintfz(filename, FILENAME_MAX, "%s/health/health-log.db", host->varlib_dir);
 126         host->health_log_filename = strdupz(filename);
 127
 128     }
 129
 130     snprintfz(filename, FILENAME_MAX, "%s/alarm-notify.sh", netdata_configured_plugins_dir);
 131     host->health_default_exec = strdupz(config_get("health", "script to execute on alarm", filename));
 132     host->health_default_recipient = strdup("root");
 133
 134
 135     // ------------------------------------------------------------------------
 136     // load health configuration
 137
 138     health_alarm_log_load(host);
 139     health_alarm_log_open(host);
 140
 141     rrdhost_rwlock(host);
 142     health_readdir(host, health_config_dir());
 143     rrdhost_unlock(host);
 144
 145
 146     // ------------------------------------------------------------------------
 147     // add it to the index
 148
 149     if(rrdhost_index_add(host) != host)
 150         fatal("Cannot add host '%s' to index. It already exists.", hostname);
 151
 152     debug(D_RRDHOST, "Added host '%s' with guid '%s'", host->hostname, host->machine_guid);
 153     return host;
 154 }
 155
 156 RRDHOST *rrdhost_find_or_create(const char *hostname, const char *guid) {
 157     debug(D_RRDHOST, "Searching for host '%s' with guid '%s'", hostname, guid);
 158
 159     RRDHOST *host = rrdhost_find(guid, 0);
 160     if(!host)
 161         host = rrdhost_create(hostname, guid);
 162
 163     return host;
 164 }
 165
 166 // ----------------------------------------------------------------------------
 167 // RRDHOST global / startup initialization
 168
 169 void rrd_init(char *hostname) {
 170     debug(D_RRDHOST, "Initializing localhost with hostname '%s'", hostname);
 171     localhost = rrdhost_create(hostname, registry_get_this_machine_guid());
 172 }
 173
 174 // ----------------------------------------------------------------------------
 175 // RRDHOST - locks
 176
 177 void rrdhost_rwlock(RRDHOST *host) {
 178     debug(D_RRDHOST, "Write lock host '%s'", host->hostname);
 179     pthread_rwlock_wrlock(&host->rrdset_root_rwlock);
 180 }
 181
 182 void rrdhost_rdlock(RRDHOST *host) {
 183     debug(D_RRDHOST, "Read lock host '%s'", host->hostname);
 184     pthread_rwlock_rdlock(&host->rrdset_root_rwlock);
 185 }
 186
 187 void rrdhost_unlock(RRDHOST *host) {
 188     debug(D_RRDHOST, "Unlock host '%s'", host->hostname);
 189     pthread_rwlock_unlock(&host->rrdset_root_rwlock);
 190 }
 191
 192 void rrdhost_check_rdlock_int(RRDHOST *host, const char *file, const char *function, const unsigned long line) {
 193     debug(D_RRDHOST, "Read lock host '%s'", host->hostname);
 194
 195     int ret = pthread_rwlock_trywrlock(&host->rrdset_root_rwlock);
 196     if(ret == 0)
 197         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);
 198 }
 199
 200 void rrdhost_check_wrlock_int(RRDHOST *host, const char *file, const char *function, const unsigned long line) {
 201     debug(D_RRDHOST, "Write lock host '%s'", host->hostname);
 202
 203     int ret = pthread_rwlock_tryrdlock(&host->rrdset_root_rwlock);
 204     if(ret == 0)
 205         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);
 206 }
 207
 208 void rrdhost_free(RRDHOST *host) {
 209     if(!host) return;
 210
 211     info("Freeing all memory for host '%s'...", host->hostname);
 212
 213     rrdhost_rwlock(host);
 214
 215     RRDSET *st;
 216     for(st = host->rrdset_root; st ;) {
 217         RRDSET *next = st->next;
 218
 219         rrdset_free(st);
 220
 221         st = next;
 222     }
 223     host->rrdset_root = NULL;
 224
 225     freez(host->cache_dir);
 226     freez(host->varlib_dir);
 227     freez(host->health_default_exec);
 228     freez(host->health_default_recipient);
 229     freez(host->health_log_filename);
 230     freez(host->hostname);
 231     rrdhost_unlock(host);
 232     freez(host);
 233
 234     info("Host memory cleanup completed...");
 235 }
 236
 237 void rrdhost_save(RRDHOST *host) {
 238     if(!host) return;
 239
 240     info("Saving host '%s' database...", host->hostname);
 241
 242     RRDSET *st;
 243     RRDDIM *rd;
 244
 245     // we get a write lock
 246     // to ensure only one thread is saving the database
 247     rrdhost_rwlock(host);
 248
 249     for(st = host->rrdset_root; st ; st = st->next) {
 250         pthread_rwlock_rdlock(&st->rwlock);
 251
 252         if(st->rrd_memory_mode == RRD_MEMORY_MODE_SAVE) {
 253             debug(D_RRD_STATS, "Saving stats '%s' to '%s'.", st->name, st->cache_filename);
 254             savememory(st->cache_filename, st, st->memsize);
 255         }
 256
 257         for(rd = st->dimensions; rd ; rd = rd->next) {
 258             if(likely(rd->rrd_memory_mode == RRD_MEMORY_MODE_SAVE)) {
 259                 debug(D_RRD_STATS, "Saving dimension '%s' to '%s'.", rd->name, rd->cache_filename);
 260                 savememory(rd->cache_filename, rd, rd->memsize);
 261             }
 262         }
 263
 264         pthread_rwlock_unlock(&st->rwlock);
 265     }
 266
 267     rrdhost_unlock(host);
 268 }
 269
 270 void rrdhost_free_all(void) {
 271     RRDHOST *host = localhost;
 272
 273     // FIXME: lock all hosts
 274
 275     while(host) {
 276         RRDHOST *next = host = host->next;
 277         rrdhost_free(host);
 278         host = next;
 279     }
 280
 281     localhost = NULL;
 282
 283     // FIXME: unlock all hosts
 284 }
 285
 286 void rrdhost_save_all(void) {
 287     info("Saving database...");
 288
 289     RRDHOST *host;
 290     for(host = localhost; host ; host = host->next)
 291         rrdhost_save(host);
 292 }