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1 #define NETDATA_RRD_INTERNALS 1
2 #include "common.h"
3
4 RRDHOST *localhost = NULL;
5
6 pthread_rwlock_t rrd_rwlock = PTHREAD_RWLOCK_INITIALIZER;
7
8
9 // ----------------------------------------------------------------------------
10 // RRDHOST index
11
12 int rrdhost_compare(void* a, void* b) {
13     if(((RRDHOST *)a)->hash_machine_guid < ((RRDHOST *)b)->hash_machine_guid) return -1;
14     else if(((RRDHOST *)a)->hash_machine_guid > ((RRDHOST *)b)->hash_machine_guid) return 1;
15     else return strcmp(((RRDHOST *)a)->machine_guid, ((RRDHOST *)b)->machine_guid);
16 }
17
18 avl_tree_lock rrdhost_root_index = {
19         .avl_tree = { NULL, rrdhost_compare },
20         .rwlock = AVL_LOCK_INITIALIZER
21 };
22
23 RRDHOST *rrdhost_find(const char *guid, uint32_t hash) {
24     debug(D_RRDHOST, "Searching in index for host with guid '%s'", guid);
25
26     RRDHOST tmp;
27     strncpyz(tmp.machine_guid, guid, GUID_LEN);
28     tmp.hash_machine_guid = (hash)?hash:simple_hash(tmp.machine_guid);
29
30     return (RRDHOST *)avl_search_lock(&(rrdhost_root_index), (avl *) &tmp);
31 }
32
33 #define rrdhost_index_add(rrdhost) (RRDHOST *)avl_insert_lock(&(rrdhost_root_index), (avl *)(rrdhost))
34 #define rrdhost_index_del(rrdhost) (RRDHOST *)avl_remove_lock(&(rrdhost_root_index), (avl *)(rrdhost))
35
36
37 // ----------------------------------------------------------------------------
38 // RRDHOST - internal helpers
39
40 static inline void rrdhost_init_hostname(RRDHOST *host, const char *hostname) {
41     freez(host->hostname);
42     host->hostname = strdupz(hostname);
43     host->hash_hostname = simple_hash(host->hostname);
44 }
45
46 static inline void rrdhost_init_machine_guid(RRDHOST *host, const char *machine_guid) {
47     strncpy(host->machine_guid, machine_guid, GUID_LEN);
48     host->machine_guid[GUID_LEN] = '\0';
49     host->hash_machine_guid = simple_hash(host->machine_guid);
50 }
51
52
53 // ----------------------------------------------------------------------------
54 // RRDHOST - add a host
55
56 RRDHOST *rrdhost_create(const char *hostname,
57         const char *guid,
58         int update_every,
59         int entries,
60         RRD_MEMORY_MODE memory_mode,
61         int health_enabled) {
62
63     debug(D_RRDHOST, "Host '%s': adding with guid '%s'", hostname, guid);
64
65     RRDHOST *host = callocz(1, sizeof(RRDHOST));
66
67     host->rrd_update_every    = update_every;
68     host->rrd_history_entries = entries;
69     host->rrd_memory_mode     = memory_mode;
70     host->health_enabled      = health_enabled;
71
72     pthread_rwlock_init(&(host->rrdhost_rwlock), NULL);
73
74     rrdhost_init_hostname(host, hostname);
75     rrdhost_init_machine_guid(host, guid);
76
77     avl_init_lock(&(host->rrdset_root_index), rrdset_compare);
78     avl_init_lock(&(host->rrdset_root_index_name), rrdset_compare_name);
79     avl_init_lock(&(host->rrdfamily_root_index), rrdfamily_compare);
80     avl_init_lock(&(host->variables_root_index), rrdvar_compare);
81
82     // ------------------------------------------------------------------------
83     // initialize health variables
84
85     host->health_log.next_log_id = 1;
86     host->health_log.next_alarm_id = 1;
87     host->health_log.max = 1000;
88     host->health_log.next_log_id =
89     host->health_log.next_alarm_id = (uint32_t)now_realtime_sec();
90
91     long n = config_get_number("health", "in memory max health log entries", host->health_log.max);
92     if(n < 10) {
93         error("Host '%s': health configuration has invalid max log entries %ld. Using default %u", host->hostname, n, host->health_log.max);
94         config_set_number("health", "in memory max health log entries", (long)host->health_log.max);
95     }
96     else
97         host->health_log.max = (unsigned int)n;
98
99     pthread_rwlock_init(&(host->health_log.alarm_log_rwlock), NULL);
100
101     char filename[FILENAME_MAX + 1];
102
103     if(!localhost) {
104         // this is localhost
105
106         host->cache_dir = strdupz(netdata_configured_cache_dir);
107         host->varlib_dir = strdupz(netdata_configured_varlib_dir);
108
109         snprintfz(filename, FILENAME_MAX, "%s/health/health-log.db", host->varlib_dir);
110         host->health_log_filename = strdupz(config_get("health", "health db file", filename));
111
112     }
113     else {
114         // this is not localhost - append our GUID to localhost path
115
116         snprintfz(filename, FILENAME_MAX, "%s/%s", netdata_configured_cache_dir, host->machine_guid);
117         host->cache_dir = strdupz(filename);
118
119         if(host->rrd_memory_mode == RRD_MEMORY_MODE_MAP || host->rrd_memory_mode == RRD_MEMORY_MODE_SAVE) {
120             int r = mkdir(host->cache_dir, 0775);
121             if(r != 0 && errno != EEXIST)
122                 error("Host '%s': cannot create directory '%s'", host->hostname, host->cache_dir);
123         }
124
125         snprintfz(filename, FILENAME_MAX, "%s/%s", netdata_configured_varlib_dir, host->machine_guid);
126         host->varlib_dir = strdupz(filename);
127
128         if(host->health_enabled) {
129             int r = mkdir(host->varlib_dir, 0775);
130             if(r != 0 && errno != EEXIST)
131                 error("Host '%s': cannot create directory '%s'", host->hostname, host->varlib_dir);
132         }
133
134         snprintfz(filename, FILENAME_MAX, "%s/health", host->varlib_dir);
135         int r = mkdir(filename, 0775);
136         if(r != 0 && errno != EEXIST)
137             error("Host '%s': cannot create directory '%s'", host->hostname, filename);
138
139         snprintfz(filename, FILENAME_MAX, "%s/health/health-log.db", host->varlib_dir);
140         host->health_log_filename = strdupz(filename);
141
142     }
143
144     snprintfz(filename, FILENAME_MAX, "%s/alarm-notify.sh", netdata_configured_plugins_dir);
145     host->health_default_exec = strdupz(config_get("health", "script to execute on alarm", filename));
146     host->health_default_recipient = strdup("root");
147
148
149     // ------------------------------------------------------------------------
150     // load health configuration
151
152     health_alarm_log_load(host);
153     health_alarm_log_open(host);
154
155     rrdhost_wrlock(host);
156     health_readdir(host, health_config_dir());
157     rrdhost_unlock(host);
158
159
160     // ------------------------------------------------------------------------
161     // link it and add it to the index
162
163     rrd_wrlock();
164
165     if(localhost) {
166         host->next = localhost->next;
167         localhost->next = host;
168     }
169
170     if(rrdhost_index_add(host) != host)
171         fatal("Host '%s': cannot add host to index. It already exists.", hostname);
172
173     rrd_unlock();
174
175     debug(D_RRDHOST, "Host '%s', added with guid '%s'", host->hostname, host->machine_guid);
176     return host;
177 }
178
179 RRDHOST *rrdhost_find_or_create(const char *hostname, const char *guid, int update_every, int history, RRD_MEMORY_MODE mode, int health_enabled) {
180     debug(D_RRDHOST, "Searching for host '%s' with guid '%s'", hostname, guid);
181
182     RRDHOST *host = rrdhost_find(guid, 0);
183     if(!host) {
184         host = rrdhost_create(hostname, guid, update_every, history, mode, health_enabled);
185     }
186     else {
187         host->health_enabled = health_enabled;
188
189         if(strcmp(host->hostname, hostname)) {
190             char *t = host->hostname;
191             char *n = strdupz(hostname);
192             host->hostname = n;
193             freez(t);
194         }
195
196         if(host->rrd_update_every != update_every)
197             error("Host '%s' has an update frequency of %d seconds, but the wanted one is %d seconds.", host->hostname, host->rrd_update_every, update_every);
198
199         if(host->rrd_history_entries != history)
200             error("Host '%s' has history of %d entries, but the wanted one is %d entries.", host->hostname, host->rrd_history_entries, history);
201
202         if(host->rrd_memory_mode != mode)
203             error("Host '%s' has memory mode '%s', but the wanted one is '%s'.", host->hostname, rrd_memory_mode_name(host->rrd_memory_mode), rrd_memory_mode_name(mode));
204     }
205
206     return host;
207 }
208
209 // ----------------------------------------------------------------------------
210 // RRDHOST global / startup initialization
211
212 void rrd_init(char *hostname) {
213     debug(D_RRDHOST, "Initializing localhost with hostname '%s'", hostname);
214
215     localhost = rrdhost_create(hostname,
216             registry_get_this_machine_guid(),
217             default_rrd_update_every,
218             default_rrd_history_entries,
219             default_rrd_memory_mode,
220             default_health_enabled
221     );
222 }
223
224 // ----------------------------------------------------------------------------
225 // RRDHOST - lock validations
226 // there are only used when NETDATA_INTERNAL_CHECKS is set
227
228 void rrdhost_check_rdlock_int(RRDHOST *host, const char *file, const char *function, const unsigned long line) {
229     debug(D_RRDHOST, "Checking read lock on host '%s'", host->hostname);
230
231     int ret = pthread_rwlock_trywrlock(&host->rrdhost_rwlock);
232     if(ret == 0)
233         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);
234 }
235
236 void rrdhost_check_wrlock_int(RRDHOST *host, const char *file, const char *function, const unsigned long line) {
237     debug(D_RRDHOST, "Checking write lock on host '%s'", host->hostname);
238
239     int ret = pthread_rwlock_tryrdlock(&host->rrdhost_rwlock);
240     if(ret == 0)
241         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);
242 }
243
244 void rrd_check_rdlock_int(const char *file, const char *function, const unsigned long line) {
245     debug(D_RRDHOST, "Checking read lock on all RRDs");
246
247     int ret = pthread_rwlock_trywrlock(&rrd_rwlock);
248     if(ret == 0)
249         fatal("RRDs should be read-locked, but it are not, at function %s() at line %lu of file '%s'", function, line, file);
250 }
251
252 void rrd_check_wrlock_int(const char *file, const char *function, const unsigned long line) {
253     debug(D_RRDHOST, "Checking write lock on all RRDs");
254
255     int ret = pthread_rwlock_tryrdlock(&rrd_rwlock);
256     if(ret == 0)
257         fatal("RRDs should be write-locked, but it are not, at function %s() at line %lu of file '%s'", function, line, file);
258 }
259
260 // ----------------------------------------------------------------------------
261 // RRDHOST - free
262
263 void rrdhost_free(RRDHOST *host) {
264     if(!host) return;
265
266     info("Freeing all memory for host '%s'...", host->hostname);
267
268     rrd_check_wrlock();     // make sure the RRDs are write locked
269     rrdhost_wrlock(host);   // lock this RRDHOST
270
271     // ------------------------------------------------------------------------
272     // release its children resources
273
274     while(host->rrdset_root) rrdset_free(host->rrdset_root);
275
276     while(host->alarms) rrdcalc_free(host, host->alarms);
277     while(host->templates) rrdcalctemplate_free(host, host->templates);
278     health_alarm_log_free(host);
279
280
281     // ------------------------------------------------------------------------
282     // remove it from the indexes
283
284     if(rrdhost_index_del(host) != host)
285         error("RRDHOST '%s' removed from index, deleted the wrong entry.", host->hostname);
286
287
288     // ------------------------------------------------------------------------
289     // unlink it from the host
290
291     if(host == localhost) {
292         localhost = host->next;
293     }
294     else {
295         // find the previous one
296         RRDHOST *h;
297         for(h = localhost; h && h->next != host ; h = h->next) ;
298
299         // bypass it
300         if(h) h->next = host->next;
301         else error("Request to free RRDHOST '%s': cannot find it", host->hostname);
302     }
303
304     // ------------------------------------------------------------------------
305     // free it
306
307     freez(host->cache_dir);
308     freez(host->varlib_dir);
309     freez(host->health_default_exec);
310     freez(host->health_default_recipient);
311     freez(host->health_log_filename);
312     freez(host->hostname);
313     rrdhost_unlock(host);
314     freez(host);
315
316     info("Host memory cleanup completed...");
317 }
318
319 void rrdhost_free_all(void) {
320     rrd_wrlock();
321     while(localhost) rrdhost_free(localhost);
322     rrd_unlock();
323 }
324
325 // ----------------------------------------------------------------------------
326 // RRDHOST - save
327
328 void rrdhost_save(RRDHOST *host) {
329     if(!host) return;
330
331     info("Saving host '%s' database...", host->hostname);
332
333     RRDSET *st;
334     RRDDIM *rd;
335
336     // we get a write lock
337     // to ensure only one thread is saving the database
338     rrdhost_wrlock(host);
339
340     rrdset_foreach_write(st, host) {
341         rrdset_rdlock(st);
342
343         if(st->rrd_memory_mode == RRD_MEMORY_MODE_SAVE) {
344             debug(D_RRD_STATS, "Saving stats '%s' to '%s'.", st->name, st->cache_filename);
345             savememory(st->cache_filename, st, st->memsize);
346         }
347
348         rrddim_foreach_read(rd, st) {
349             if(likely(rd->rrd_memory_mode == RRD_MEMORY_MODE_SAVE)) {
350                 debug(D_RRD_STATS, "Saving dimension '%s' to '%s'.", rd->name, rd->cache_filename);
351                 savememory(rd->cache_filename, rd, rd->memsize);
352             }
353         }
354
355         rrdset_unlock(st);
356     }
357
358     rrdhost_unlock(host);
359 }
360
361 void rrdhost_save_all(void) {
362     info("Saving database...");
363
364     rrd_rdlock();
365
366     RRDHOST *host;
367     rrdhost_foreach_read(host)
368         rrdhost_save(host);
369
370     rrd_unlock();
371 }