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,
  53         const char *guid,
  54         int update_every,
  55         int entries,
  56         RRD_MEMORY_MODE memory_mode,
  57         int health_enabled) {
  58
  59     debug(D_RRDHOST, "Adding host '%s' with guid '%s'", hostname, guid);
  60
  61     RRDHOST *host = callocz(1, sizeof(RRDHOST));
  62
  63     host->rrd_update_every    = update_every;
  64     host->rrd_history_entries = entries;
  65     host->rrd_memory_mode     = memory_mode;
  66     host->health_enabled      = health_enabled;
  67
  68     pthread_rwlock_init(&(host->rrdhost_rwlock), NULL);
  69
  70     rrdhost_init_hostname(host, hostname);
  71     rrdhost_init_machine_guid(host, guid);
  72
  73     avl_init_lock(&(host->rrdset_root_index), rrdset_compare);
  74     avl_init_lock(&(host->rrdset_root_index_name), rrdset_compare_name);
  75     avl_init_lock(&(host->rrdfamily_root_index), rrdfamily_compare);
  76     avl_init_lock(&(host->variables_root_index), rrdvar_compare);
  77
  78
  79     // ------------------------------------------------------------------------
  80     // initialize health variables
  81
  82     host->health_log.next_log_id = 1;
  83     host->health_log.next_alarm_id = 1;
  84     host->health_log.max = 1000;
  85     host->health_log.next_log_id =
  86     host->health_log.next_alarm_id = (uint32_t)now_realtime_sec();
  87
  88     long n = config_get_number("health", "in memory max health log entries", host->health_log.max);
  89     if(n < 10) {
  90         error("Health configuration has invalid max log entries %ld. Using default %u", n, host->health_log.max);
  91         config_set_number("health", "in memory max health log entries", (long)host->health_log.max);
  92     }
  93     else
  94         host->health_log.max = (unsigned int)n;
  95
  96     pthread_rwlock_init(&(host->health_log.alarm_log_rwlock), NULL);
  97
  98     char filename[FILENAME_MAX + 1];
  99
 100     if(!localhost) {
 101         // this is localhost
 102
 103         host->cache_dir = strdupz(netdata_configured_cache_dir);
 104         host->varlib_dir = strdupz(netdata_configured_varlib_dir);
 105
 106         snprintfz(filename, FILENAME_MAX, "%s/health/health-log.db", host->varlib_dir);
 107         host->health_log_filename = strdupz(config_get("health", "health db file", filename));
 108
 109     }
 110     else {
 111         // this is not localhost - append our GUID to localhost path
 112
 113         snprintfz(filename, FILENAME_MAX, "%s/%s", netdata_configured_cache_dir, host->machine_guid);
 114         host->cache_dir = strdupz(filename);
 115
 116         if(host->rrd_memory_mode == RRD_MEMORY_MODE_MAP || host->rrd_memory_mode == RRD_MEMORY_MODE_SAVE) {
 117             int r = mkdir(host->cache_dir, 0775);
 118             if(r != 0 && errno != EEXIST)
 119                 error("Cannot create directory '%s'", host->cache_dir);
 120         }
 121
 122         snprintfz(filename, FILENAME_MAX, "%s/%s", netdata_configured_varlib_dir, host->machine_guid);
 123         host->varlib_dir = strdupz(filename);
 124
 125         if(host->health_enabled) {
 126             int r = mkdir(host->varlib_dir, 0775);
 127             if(r != 0 && errno != EEXIST)
 128                 error("Cannot create directory '%s'", host->varlib_dir);
 129         }
 130
 131         snprintfz(filename, FILENAME_MAX, "%s/health/health-log.db", host->varlib_dir);
 132         host->health_log_filename = strdupz(filename);
 133
 134     }
 135
 136     snprintfz(filename, FILENAME_MAX, "%s/alarm-notify.sh", netdata_configured_plugins_dir);
 137     host->health_default_exec = strdupz(config_get("health", "script to execute on alarm", filename));
 138     host->health_default_recipient = strdup("root");
 139
 140
 141     // ------------------------------------------------------------------------
 142     // load health configuration
 143
 144     health_alarm_log_load(host);
 145     health_alarm_log_open(host);
 146
 147     rrdhost_wrlock(host);
 148     health_readdir(host, health_config_dir());
 149     rrdhost_unlock(host);
 150
 151
 152     // ------------------------------------------------------------------------
 153     // add it to the index
 154
 155     if(rrdhost_index_add(host) != host)
 156         fatal("Cannot add host '%s' to index. It already exists.", hostname);
 157
 158     debug(D_RRDHOST, "Added host '%s' with guid '%s'", host->hostname, host->machine_guid);
 159     return host;
 160 }
 161
 162 RRDHOST *rrdhost_find_or_create(const char *hostname, const char *guid) {
 163     debug(D_RRDHOST, "Searching for host '%s' with guid '%s'", hostname, guid);
 164
 165     RRDHOST *host = rrdhost_find(guid, 0);
 166     if(!host)
 167         host = rrdhost_create(hostname,
 168                 guid,
 169                 default_localhost_rrd_update_every,
 170                 default_localhost_rrd_history_entries,
 171                 default_localhost_rrd_memory_mode,
 172                 default_localhost_health_enabled
 173         );
 174
 175     return host;
 176 }
 177
 178 // ----------------------------------------------------------------------------
 179 // RRDHOST global / startup initialization
 180
 181 void rrd_init(char *hostname) {
 182     debug(D_RRDHOST, "Initializing localhost with hostname '%s'", hostname);
 183
 184     localhost = rrdhost_create(hostname,
 185             registry_get_this_machine_guid(),
 186             default_localhost_rrd_update_every,
 187             default_localhost_rrd_history_entries,
 188             default_localhost_rrd_memory_mode,
 189             default_localhost_health_enabled
 190     );
 191 }
 192
 193 // ----------------------------------------------------------------------------
 194 // RRDHOST - lock validations
 195 // there are only used when NETDATA_INTERNAL_CHECKS is set
 196
 197 void rrdhost_check_rdlock_int(RRDHOST *host, const char *file, const char *function, const unsigned long line) {
 198     debug(D_RRDHOST, "Checking read lock on host '%s'", host->hostname);
 199
 200     int ret = pthread_rwlock_trywrlock(&host->rrdhost_rwlock);
 201     if(ret == 0)
 202         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);
 203 }
 204
 205 void rrdhost_check_wrlock_int(RRDHOST *host, const char *file, const char *function, const unsigned long line) {
 206     debug(D_RRDHOST, "Checking write lock on host '%s'", host->hostname);
 207
 208     int ret = pthread_rwlock_tryrdlock(&host->rrdhost_rwlock);
 209     if(ret == 0)
 210         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);
 211 }
 212
 213 // ----------------------------------------------------------------------------
 214 // RRDHOST - free
 215
 216 void rrdhost_free(RRDHOST *host) {
 217     if(!host) return;
 218
 219     info("Freeing all memory for host '%s'...", host->hostname);
 220
 221     rrdhost_wrlock(host);
 222
 223     RRDSET *st;
 224     for(st = host->rrdset_root; st ;) {
 225         RRDSET *next = st->next;
 226
 227         rrdset_free(st);
 228
 229         st = next;
 230     }
 231     host->rrdset_root = NULL;
 232
 233     if(rrdhost_index_del(host) != host)
 234         error("RRDHOST '%s' removed from index, deleted the wrong entry.", host->hostname);
 235
 236     freez(host->cache_dir);
 237     freez(host->varlib_dir);
 238     freez(host->health_default_exec);
 239     freez(host->health_default_recipient);
 240     freez(host->health_log_filename);
 241     freez(host->hostname);
 242     rrdhost_unlock(host);
 243     freez(host);
 244
 245     info("Host memory cleanup completed...");
 246 }
 247
 248 void rrdhost_free_all(void) {
 249     RRDHOST *host = localhost;
 250
 251     // FIXME: lock all hosts
 252
 253     while(host) {
 254         RRDHOST *next = host = host->next;
 255         rrdhost_free(host);
 256         host = next;
 257     }
 258
 259     localhost = NULL;
 260
 261     // FIXME: unlock all hosts
 262 }
 263
 264 // ----------------------------------------------------------------------------
 265 // RRDHOST - save
 266
 267 void rrdhost_save(RRDHOST *host) {
 268     if(!host) return;
 269
 270     info("Saving host '%s' database...", host->hostname);
 271
 272     RRDSET *st;
 273     RRDDIM *rd;
 274
 275     // we get a write lock
 276     // to ensure only one thread is saving the database
 277     rrdhost_wrlock(host);
 278
 279     for(st = host->rrdset_root; st ; st = st->next) {
 280         rrdset_rdlock(st);
 281
 282         if(st->rrd_memory_mode == RRD_MEMORY_MODE_SAVE) {
 283             debug(D_RRD_STATS, "Saving stats '%s' to '%s'.", st->name, st->cache_filename);
 284             savememory(st->cache_filename, st, st->memsize);
 285         }
 286
 287         for(rd = st->dimensions; rd ; rd = rd->next) {
 288             if(likely(rd->rrd_memory_mode == RRD_MEMORY_MODE_SAVE)) {
 289                 debug(D_RRD_STATS, "Saving dimension '%s' to '%s'.", rd->name, rd->cache_filename);
 290                 savememory(rd->cache_filename, rd, rd->memsize);
 291             }
 292         }
 293
 294         rrdset_unlock(st);
 295     }
 296
 297     rrdhost_unlock(host);
 298 }
 299
 300 void rrdhost_save_all(void) {
 301     info("Saving database...");
 302
 303     RRDHOST *host;
 304     for(host = localhost; host ; host = host->next)
 305         rrdhost_save(host);
 306 }