src/rrdhost.c

   1 #define NETDATA_RRD_INTERNALS 1
   2 #include "common.h"
   3
   4 // ----------------------------------------------------------------------------
   5 // RRDHOST index
   6
   7 int rrdhost_compare(void* a, void* b) {
   8     if(((RRDHOST *)a)->hash_machine_guid < ((RRDHOST *)b)->hash_machine_guid) return -1;
   9     else if(((RRDHOST *)a)->hash_machine_guid > ((RRDHOST *)b)->hash_machine_guid) return 1;
  10     else return strcmp(((RRDHOST *)a)->machine_guid, ((RRDHOST *)b)->machine_guid);
  11 }
  12
  13 avl_tree_lock rrdhost_root_index = {
  14         .avl_tree = { NULL, rrdhost_compare },
  15         .rwlock = AVL_LOCK_INITIALIZER
  16 };
  17
  18 RRDHOST *rrdhost_find(const char *guid, uint32_t hash) {
  19     RRDHOST tmp;
  20     strncpyz(tmp.machine_guid, guid, GUID_LEN);
  21     tmp.hash_machine_guid = (hash)?hash:simple_hash(tmp.machine_guid);
  22
  23     return (RRDHOST *)avl_search_lock(&(rrdhost_root_index), (avl *) &tmp);
  24 }
  25
  26 #define rrdhost_index_add(rrdhost) (RRDHOST *)avl_insert_lock(&(rrdhost_root_index), (avl *)(rrdhost))
  27 #define rrdhost_index_del(rrdhost) (RRDHOST *)avl_remove_lock(&(rrdhost_root_index), (avl *)(rrdhost))
  28
  29
  30 // ----------------------------------------------------------------------------
  31 // RRDHOST - internal helpers
  32
  33 static inline void rrdhost_init_hostname(RRDHOST *host, const char *hostname) {
  34     freez(host->hostname);
  35     host->hostname = strdupz(hostname);
  36     host->hash_hostname = simple_hash(host->hostname);
  37 }
  38
  39 static inline void rrdhost_init_machine_guid(RRDHOST *host, const char *machine_guid) {
  40     strncpy(host->machine_guid, machine_guid, GUID_LEN);
  41     host->machine_guid[GUID_LEN] = '\0';
  42     host->hash_machine_guid = simple_hash(host->machine_guid);
  43 }
  44
  45 // ----------------------------------------------------------------------------
  46 // RRDHOST - add a host
  47
  48 RRDHOST *rrdhost_create(const char *hostname, const char *guid) {
  49     RRDHOST *host = callocz(1, sizeof(RRDHOST));
  50
  51     pthread_rwlock_init(&(host->rrdset_root_rwlock), NULL);
  52
  53     rrdhost_init_hostname(host, hostname);
  54     rrdhost_init_machine_guid(host, guid);
  55
  56     avl_init_lock(&(host->rrdset_root_index), rrdset_compare);
  57     avl_init_lock(&(host->rrdset_root_index_name), rrdset_compare_name);
  58     avl_init_lock(&(host->rrdfamily_root_index), rrdfamily_compare);
  59     avl_init_lock(&(host->variables_root_index), rrdvar_compare);
  60
  61     host->health_log.next_log_id = 1;
  62     host->health_log.next_alarm_id = 1;
  63     host->health_log.max = 1000;
  64     host->health_log.next_log_id =
  65     host->health_log.next_alarm_id = (uint32_t)now_realtime_sec();
  66     pthread_rwlock_init(&(host->health_log.alarm_log_rwlock), NULL);
  67
  68     if(rrdhost_index_add(host) != host)
  69         fatal("Cannot add host '%s' to index. It already exists.", hostname);
  70
  71     debug(D_RRDHOST, "Added host '%s'", host->hostname);
  72     return host;
  73 }
  74
  75 // ----------------------------------------------------------------------------
  76 // RRDHOST global / startup initialization
  77
  78 RRDHOST *localhost = NULL;
  79
  80 void rrd_init(char *hostname) {
  81     localhost = rrdhost_create(hostname, registry_get_this_machine_guid());
  82 }
  83
  84 // ----------------------------------------------------------------------------
  85 // RRDHOST - locks
  86
  87 void rrdhost_rwlock(RRDHOST *host) {
  88     pthread_rwlock_wrlock(&host->rrdset_root_rwlock);
  89 }
  90
  91 void rrdhost_rdlock(RRDHOST *host) {
  92     pthread_rwlock_rdlock(&host->rrdset_root_rwlock);
  93 }
  94
  95 void rrdhost_unlock(RRDHOST *host) {
  96     pthread_rwlock_unlock(&host->rrdset_root_rwlock);
  97 }
  98
  99 void rrdhost_check_rdlock_int(RRDHOST *host, const char *file, const char *function, const unsigned long line) {
 100     int ret = pthread_rwlock_trywrlock(&host->rrdset_root_rwlock);
 101
 102     if(ret == 0)
 103         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);
 104 }
 105
 106 void rrdhost_check_wrlock_int(RRDHOST *host, const char *file, const char *function, const unsigned long line) {
 107     int ret = pthread_rwlock_tryrdlock(&host->rrdset_root_rwlock);
 108
 109     if(ret == 0)
 110         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);
 111 }
 112
 113 void rrdhost_free(RRDHOST *host) {
 114     if(!host) return;
 115
 116     info("Freeing all memory for host '%s'...", host->hostname);
 117
 118     rrdhost_rwlock(host);
 119
 120     RRDSET *st;
 121     for(st = host->rrdset_root; st ;) {
 122         RRDSET *next = st->next;
 123
 124         pthread_rwlock_wrlock(&st->rwlock);
 125
 126         while(st->variables)
 127             rrdsetvar_free(st->variables);
 128
 129         while(st->alarms)
 130             rrdsetcalc_unlink(st->alarms);
 131
 132         while(st->dimensions)
 133             rrddim_free(st, st->dimensions);
 134
 135         if(unlikely(rrdset_index_del(host, st) != st))
 136             error("RRDSET: INTERNAL ERROR: attempt to remove from index chart '%s', removed a different chart.", st->id);
 137
 138         rrdset_index_del_name(host, st);
 139
 140         st->rrdfamily->use_count--;
 141         if(!st->rrdfamily->use_count)
 142             rrdfamily_free(host, st->rrdfamily);
 143
 144         pthread_rwlock_unlock(&st->rwlock);
 145
 146         if(st->mapped == RRD_MEMORY_MODE_SAVE || st->mapped == RRD_MEMORY_MODE_MAP) {
 147             debug(D_RRD_CALLS, "Unmapping stats '%s'.", st->name);
 148             munmap(st, st->memsize);
 149         }
 150         else
 151             freez(st);
 152
 153         st = next;
 154     }
 155     host->rrdset_root = NULL;
 156
 157     freez(host->hostname);
 158     rrdhost_unlock(host);
 159     freez(host);
 160
 161     info("Host memory cleanup completed...");
 162 }
 163
 164 void rrdhost_save(RRDHOST *host) {
 165     if(!host) return;
 166
 167     info("Saving host '%s' database...", host->hostname);
 168
 169     RRDSET *st;
 170     RRDDIM *rd;
 171
 172     // we get an write lock
 173     // to ensure only one thread is saving the database
 174     rrdhost_rwlock(host);
 175
 176     for(st = host->rrdset_root; st ; st = st->next) {
 177         pthread_rwlock_rdlock(&st->rwlock);
 178
 179         if(st->mapped == RRD_MEMORY_MODE_SAVE) {
 180             debug(D_RRD_CALLS, "Saving stats '%s' to '%s'.", st->name, st->cache_filename);
 181             savememory(st->cache_filename, st, st->memsize);
 182         }
 183
 184         for(rd = st->dimensions; rd ; rd = rd->next) {
 185             if(likely(rd->memory_mode == RRD_MEMORY_MODE_SAVE)) {
 186                 debug(D_RRD_CALLS, "Saving dimension '%s' to '%s'.", rd->name, rd->cache_filename);
 187                 savememory(rd->cache_filename, rd, rd->memsize);
 188             }
 189         }
 190
 191         pthread_rwlock_unlock(&st->rwlock);
 192     }
 193
 194     rrdhost_unlock(host);
 195 }
 196
 197 void rrdhost_free_all(void) {
 198     RRDHOST *host = localhost;
 199
 200     // FIXME: lock all hosts
 201
 202     while(host) {
 203         RRDHOST *next = host = host->next;
 204         rrdhost_free(host);
 205         host = next;
 206     }
 207
 208     localhost = NULL;
 209
 210     // FIXME: unlock all hosts
 211 }
 212
 213 void rrdhost_save_all(void) {
 214     RRDHOST *host;
 215     for(host = localhost; host ; host = host->next)
 216         rrdhost_save(host);
 217 }