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         snprintfz(filename, FILENAME_MAX, "%s/health/health-log.db", netdata_configured_varlib_dir);
  97         host->health_log_filename = strdupz(config_get("health", "health db file", filename));
  98     }
  99     else {
 100         // this is not localhost - append our GUID to localhost path
 101         snprintfz(filename, FILENAME_MAX, "%s.%s", localhost->health_log_filename, host->machine_guid);
 102         host->health_log_filename = strdupz(filename);
 103     }
 104
 105     snprintfz(filename, FILENAME_MAX, "%s/alarm-notify.sh", netdata_configured_plugins_dir);
 106     host->health_default_exec = strdupz(config_get("health", "script to execute on alarm", filename));
 107     host->health_default_recipient = strdup("root");
 108
 109
 110     // ------------------------------------------------------------------------
 111     // load health configuration
 112
 113     health_alarm_log_load(host);
 114     health_alarm_log_open(host);
 115
 116     rrdhost_rwlock(host);
 117     health_readdir(host, health_config_dir());
 118     rrdhost_unlock(host);
 119
 120
 121     // ------------------------------------------------------------------------
 122     // add it to the index
 123
 124     if(rrdhost_index_add(host) != host)
 125         fatal("Cannot add host '%s' to index. It already exists.", hostname);
 126
 127     debug(D_RRDHOST, "Added host '%s' with guid '%s'", host->hostname, host->machine_guid);
 128     return host;
 129 }
 130
 131 RRDHOST *rrdhost_find_or_create(const char *hostname, const char *guid) {
 132     debug(D_RRDHOST, "Searching for host '%s' with guid '%s'", hostname, guid);
 133
 134     RRDHOST *host = rrdhost_find(guid, 0);
 135     if(!host)
 136         host = rrdhost_create(hostname, guid);
 137
 138     return host;
 139 }
 140
 141 // ----------------------------------------------------------------------------
 142 // RRDHOST global / startup initialization
 143
 144 void rrd_init(char *hostname) {
 145     debug(D_RRDHOST, "Initializing localhost with hostname '%s'", hostname);
 146     localhost = rrdhost_create(hostname, registry_get_this_machine_guid());
 147 }
 148
 149 // ----------------------------------------------------------------------------
 150 // RRDHOST - locks
 151
 152 void rrdhost_rwlock(RRDHOST *host) {
 153     debug(D_RRDHOST, "Write lock host '%s'", host->hostname);
 154     pthread_rwlock_wrlock(&host->rrdset_root_rwlock);
 155 }
 156
 157 void rrdhost_rdlock(RRDHOST *host) {
 158     debug(D_RRDHOST, "Read lock host '%s'", host->hostname);
 159     pthread_rwlock_rdlock(&host->rrdset_root_rwlock);
 160 }
 161
 162 void rrdhost_unlock(RRDHOST *host) {
 163     debug(D_RRDHOST, "Unlock host '%s'", host->hostname);
 164     pthread_rwlock_unlock(&host->rrdset_root_rwlock);
 165 }
 166
 167 void rrdhost_check_rdlock_int(RRDHOST *host, const char *file, const char *function, const unsigned long line) {
 168     debug(D_RRDHOST, "Read lock host '%s'", host->hostname);
 169
 170     int ret = pthread_rwlock_trywrlock(&host->rrdset_root_rwlock);
 171     if(ret == 0)
 172         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);
 173 }
 174
 175 void rrdhost_check_wrlock_int(RRDHOST *host, const char *file, const char *function, const unsigned long line) {
 176     debug(D_RRDHOST, "Write lock host '%s'", host->hostname);
 177
 178     int ret = pthread_rwlock_tryrdlock(&host->rrdset_root_rwlock);
 179     if(ret == 0)
 180         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);
 181 }
 182
 183 void rrdhost_free(RRDHOST *host) {
 184     if(!host) return;
 185
 186     info("Freeing all memory for host '%s'...", host->hostname);
 187
 188     rrdhost_rwlock(host);
 189
 190     RRDSET *st;
 191     for(st = host->rrdset_root; st ;) {
 192         RRDSET *next = st->next;
 193
 194         pthread_rwlock_wrlock(&st->rwlock);
 195
 196         while(st->variables)  rrdsetvar_free(st->variables);
 197         while(st->alarms)     rrdsetcalc_unlink(st->alarms);
 198         while(st->dimensions) rrddim_free(st, st->dimensions);
 199
 200         if(unlikely(rrdset_index_del(host, st) != st))
 201             error("RRDSET: INTERNAL ERROR: attempt to remove from index chart '%s', removed a different chart.", st->id);
 202
 203         rrdset_index_del_name(host, st);
 204
 205         st->rrdfamily->use_count--;
 206         if(!st->rrdfamily->use_count)
 207             rrdfamily_free(host, st->rrdfamily);
 208
 209         pthread_rwlock_unlock(&st->rwlock);
 210
 211         if(st->mapped == RRD_MEMORY_MODE_SAVE || st->mapped == RRD_MEMORY_MODE_MAP) {
 212             debug(D_RRD_CALLS, "Unmapping stats '%s'.", st->name);
 213             munmap(st, st->memsize);
 214         }
 215         else
 216             freez(st);
 217
 218         st = next;
 219     }
 220     host->rrdset_root = NULL;
 221
 222     freez(host->health_default_exec);
 223     freez(host->health_default_recipient);
 224     freez(host->health_log_filename);
 225     freez(host->hostname);
 226     rrdhost_unlock(host);
 227     freez(host);
 228
 229     info("Host memory cleanup completed...");
 230 }
 231
 232 void rrdhost_save(RRDHOST *host) {
 233     if(!host) return;
 234
 235     info("Saving host '%s' database...", host->hostname);
 236
 237     RRDSET *st;
 238     RRDDIM *rd;
 239
 240     // we get an write lock
 241     // to ensure only one thread is saving the database
 242     rrdhost_rwlock(host);
 243
 244     for(st = host->rrdset_root; st ; st = st->next) {
 245         pthread_rwlock_rdlock(&st->rwlock);
 246
 247         if(st->mapped == RRD_MEMORY_MODE_SAVE) {
 248             debug(D_RRD_CALLS, "Saving stats '%s' to '%s'.", st->name, st->cache_filename);
 249             savememory(st->cache_filename, st, st->memsize);
 250         }
 251
 252         for(rd = st->dimensions; rd ; rd = rd->next) {
 253             if(likely(rd->memory_mode == RRD_MEMORY_MODE_SAVE)) {
 254                 debug(D_RRD_CALLS, "Saving dimension '%s' to '%s'.", rd->name, rd->cache_filename);
 255                 savememory(rd->cache_filename, rd, rd->memsize);
 256             }
 257         }
 258
 259         pthread_rwlock_unlock(&st->rwlock);
 260     }
 261
 262     rrdhost_unlock(host);
 263 }
 264
 265 void rrdhost_free_all(void) {
 266     RRDHOST *host = localhost;
 267
 268     // FIXME: lock all hosts
 269
 270     while(host) {
 271         RRDHOST *next = host = host->next;
 272         rrdhost_free(host);
 273         host = next;
 274     }
 275
 276     localhost = NULL;
 277
 278     // FIXME: unlock all hosts
 279 }
 280
 281 void rrdhost_save_all(void) {
 282     RRDHOST *host;
 283     for(host = localhost; host ; host = host->next)
 284         rrdhost_save(host);
 285 }