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     pthread_rwlock_init(&(host->rrdset_root_rwlock), NULL);
  58
  59     rrdhost_init_hostname(host, hostname);
  60     rrdhost_init_machine_guid(host, guid);
  61
  62     avl_init_lock(&(host->rrdset_root_index), rrdset_compare);
  63     avl_init_lock(&(host->rrdset_root_index_name), rrdset_compare_name);
  64     avl_init_lock(&(host->rrdfamily_root_index), rrdfamily_compare);
  65     avl_init_lock(&(host->variables_root_index), rrdvar_compare);
  66
  67
  68     // ------------------------------------------------------------------------
  69     // initialize health variables
  70
  71     host->health_log.next_log_id = 1;
  72     host->health_log.next_alarm_id = 1;
  73     host->health_log.max = 1000;
  74     host->health_log.next_log_id =
  75     host->health_log.next_alarm_id = (uint32_t)now_realtime_sec();
  76
  77     long n = config_get_number("health", "in memory max health log entries", host->health_log.max);
  78     if(n < 10) {
  79         error("Health configuration has invalid max log entries %ld. Using default %u", n, host->health_log.max);
  80         config_set_number("health", "in memory max health log entries", (long)host->health_log.max);
  81     }
  82     else
  83         host->health_log.max = (unsigned int)n;
  84
  85     pthread_rwlock_init(&(host->health_log.alarm_log_rwlock), NULL);
  86
  87     char filename[FILENAME_MAX + 1];
  88
  89     if(!localhost) {
  90         // this is localhost
  91         snprintfz(filename, FILENAME_MAX, "%s/health/health-log.db", netdata_configured_varlib_dir);
  92         host->health_log_filename = strdupz(config_get("health", "health db file", filename));
  93     }
  94     else {
  95         // this is not localhost - append our GUID to localhost path
  96         snprintfz(filename, FILENAME_MAX, "%s.%s", localhost->health_log_filename, host->machine_guid);
  97         host->health_log_filename = strdupz(filename);
  98     }
  99
 100     snprintfz(filename, FILENAME_MAX, "%s/alarm-notify.sh", netdata_configured_plugins_dir);
 101     host->health_default_exec = strdupz(config_get("health", "script to execute on alarm", filename));
 102     host->health_default_recipient = strdup("root");
 103
 104
 105     // ------------------------------------------------------------------------
 106     // load health configuration
 107
 108     health_alarm_log_load(host);
 109     health_alarm_log_open(host);
 110
 111     rrdhost_rwlock(host);
 112     health_readdir(host, health_config_dir());
 113     rrdhost_unlock(host);
 114
 115
 116     // ------------------------------------------------------------------------
 117     // add it to the index
 118
 119     if(rrdhost_index_add(host) != host)
 120         fatal("Cannot add host '%s' to index. It already exists.", hostname);
 121
 122     debug(D_RRDHOST, "Added host '%s' with guid '%s'", host->hostname, host->machine_guid);
 123     return host;
 124 }
 125
 126 RRDHOST *rrdhost_find_or_create(const char *hostname, const char *guid) {
 127     debug(D_RRDHOST, "Searching for host '%s' with guid '%s'", hostname, guid);
 128
 129     RRDHOST *host = rrdhost_find(guid, 0);
 130     if(!host)
 131         host = rrdhost_create(hostname, guid);
 132
 133     return host;
 134 }
 135
 136 // ----------------------------------------------------------------------------
 137 // RRDHOST global / startup initialization
 138
 139 void rrd_init(char *hostname) {
 140     debug(D_RRDHOST, "Initializing localhost with hostname '%s'", hostname);
 141     localhost = rrdhost_create(hostname, registry_get_this_machine_guid());
 142 }
 143
 144 // ----------------------------------------------------------------------------
 145 // RRDHOST - locks
 146
 147 void rrdhost_rwlock(RRDHOST *host) {
 148     debug(D_RRDHOST, "Write lock host '%s'", host->hostname);
 149     pthread_rwlock_wrlock(&host->rrdset_root_rwlock);
 150 }
 151
 152 void rrdhost_rdlock(RRDHOST *host) {
 153     debug(D_RRDHOST, "Read lock host '%s'", host->hostname);
 154     pthread_rwlock_rdlock(&host->rrdset_root_rwlock);
 155 }
 156
 157 void rrdhost_unlock(RRDHOST *host) {
 158     debug(D_RRDHOST, "Unlock host '%s'", host->hostname);
 159     pthread_rwlock_unlock(&host->rrdset_root_rwlock);
 160 }
 161
 162 void rrdhost_check_rdlock_int(RRDHOST *host, const char *file, const char *function, const unsigned long line) {
 163     debug(D_RRDHOST, "Read lock host '%s'", host->hostname);
 164
 165     int ret = pthread_rwlock_trywrlock(&host->rrdset_root_rwlock);
 166     if(ret == 0)
 167         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);
 168 }
 169
 170 void rrdhost_check_wrlock_int(RRDHOST *host, const char *file, const char *function, const unsigned long line) {
 171     debug(D_RRDHOST, "Write lock host '%s'", host->hostname);
 172
 173     int ret = pthread_rwlock_tryrdlock(&host->rrdset_root_rwlock);
 174     if(ret == 0)
 175         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);
 176 }
 177
 178 void rrdhost_free(RRDHOST *host) {
 179     if(!host) return;
 180
 181     info("Freeing all memory for host '%s'...", host->hostname);
 182
 183     rrdhost_rwlock(host);
 184
 185     RRDSET *st;
 186     for(st = host->rrdset_root; st ;) {
 187         RRDSET *next = st->next;
 188
 189         pthread_rwlock_wrlock(&st->rwlock);
 190
 191         while(st->variables)  rrdsetvar_free(st->variables);
 192         while(st->alarms)     rrdsetcalc_unlink(st->alarms);
 193         while(st->dimensions) rrddim_free(st, st->dimensions);
 194
 195         if(unlikely(rrdset_index_del(host, st) != st))
 196             error("RRDSET: INTERNAL ERROR: attempt to remove from index chart '%s', removed a different chart.", st->id);
 197
 198         rrdset_index_del_name(host, st);
 199
 200         st->rrdfamily->use_count--;
 201         if(!st->rrdfamily->use_count)
 202             rrdfamily_free(host, st->rrdfamily);
 203
 204         pthread_rwlock_unlock(&st->rwlock);
 205
 206         if(st->mapped == RRD_MEMORY_MODE_SAVE || st->mapped == RRD_MEMORY_MODE_MAP) {
 207             debug(D_RRD_CALLS, "Unmapping stats '%s'.", st->name);
 208             munmap(st, st->memsize);
 209         }
 210         else
 211             freez(st);
 212
 213         st = next;
 214     }
 215     host->rrdset_root = NULL;
 216
 217     freez(host->health_default_exec);
 218     freez(host->health_default_recipient);
 219     freez(host->health_log_filename);
 220     freez(host->hostname);
 221     rrdhost_unlock(host);
 222     freez(host);
 223
 224     info("Host memory cleanup completed...");
 225 }
 226
 227 void rrdhost_save(RRDHOST *host) {
 228     if(!host) return;
 229
 230     info("Saving host '%s' database...", host->hostname);
 231
 232     RRDSET *st;
 233     RRDDIM *rd;
 234
 235     // we get an write lock
 236     // to ensure only one thread is saving the database
 237     rrdhost_rwlock(host);
 238
 239     for(st = host->rrdset_root; st ; st = st->next) {
 240         pthread_rwlock_rdlock(&st->rwlock);
 241
 242         if(st->mapped == RRD_MEMORY_MODE_SAVE) {
 243             debug(D_RRD_CALLS, "Saving stats '%s' to '%s'.", st->name, st->cache_filename);
 244             savememory(st->cache_filename, st, st->memsize);
 245         }
 246
 247         for(rd = st->dimensions; rd ; rd = rd->next) {
 248             if(likely(rd->memory_mode == RRD_MEMORY_MODE_SAVE)) {
 249                 debug(D_RRD_CALLS, "Saving dimension '%s' to '%s'.", rd->name, rd->cache_filename);
 250                 savememory(rd->cache_filename, rd, rd->memsize);
 251             }
 252         }
 253
 254         pthread_rwlock_unlock(&st->rwlock);
 255     }
 256
 257     rrdhost_unlock(host);
 258 }
 259
 260 void rrdhost_free_all(void) {
 261     RRDHOST *host = localhost;
 262
 263     // FIXME: lock all hosts
 264
 265     while(host) {
 266         RRDHOST *next = host = host->next;
 267         rrdhost_free(host);
 268         host = next;
 269     }
 270
 271     localhost = NULL;
 272
 273     // FIXME: unlock all hosts
 274 }
 275
 276 void rrdhost_save_all(void) {
 277     RRDHOST *host;
 278     for(host = localhost; host ; host = host->next)
 279         rrdhost_save(host);
 280 }