root/src/noit_check.c

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1 /*
2  * Copyright (c) 2007, OmniTI Computer Consulting, Inc.
3  * All rights reserved.
4  */
5
6 #include "noit_defines.h"
7
8 #include <stdio.h>
9 #include <stdlib.h>
10 #include <unistd.h>
11 #include <assert.h>
12 #include <netinet/in.h>
13 #include <arpa/inet.h>
14
15 #include "utils/noit_log.h"
16 #include "utils/noit_hash.h"
17 #include "utils/noit_skiplist.h"
18 #include "noit_conf.h"
19 #include "noit_check.h"
20 #include "noit_module.h"
21 #include "noit_console.h"
22 #include "eventer/eventer.h"
23
24 /* 60 seconds of possible stutter */
25 #define MAX_INITIAL_STUTTER (60*1000)
26
27 static noit_hash_table polls = NOIT_HASH_EMPTY;
28 static noit_skiplist polls_by_name = { 0 };
29 static u_int32_t __config_load_generation = 0;
30 struct uuid_dummy {
31   uuid_t foo;
32 };
33
34 static void register_console_check_commands();
35
36 #define UUID_SIZE sizeof(struct uuid_dummy)
37
38 static const char *
39 __noit_check_available_string(int16_t available) {
40   switch(available) {
41     case NP_AVAILABLE:    return "available";
42     case NP_UNAVAILABLE:  return "unavailable";
43     case NP_UNKNOWN:      return "unknown";
44   }
45   return "???";
46 }
47 static const char *
48 __noit_check_state_string(int16_t state) {
49   switch(state) {
50     case NP_GOOD:         return "good";
51     case NP_BAD:          return "bad";
52     case NP_UNKNOWN:      return "unknown";
53   }
54   return "???";
55 }
56 static int __check_name_compare(void *a, void *b) {
57   noit_check_t *ac = a;
58   noit_check_t *bc = b;
59   int rv;
60   if((rv = strcmp(ac->target, bc->target)) != 0) return rv;
61   if((rv = strcmp(ac->name, bc->name)) != 0) return rv;
62   return 0;
63 }
64 int
65 noit_check_max_initial_stutter() {
66   return MAX_INITIAL_STUTTER;
67 }
68 void
69 noit_check_fake_last_check(noit_check_t *check,
70                            struct timeval *lc, struct timeval *_now) {
71   struct timeval now, period;
72   double r;
73   int offset;
74
75   r = drand48();
76   offset = r * (MIN(MAX_INITIAL_STUTTER, check->period));
77   period.tv_sec = (check->period - offset) / 1000;
78   period.tv_usec = ((check->period - offset) % 1000) * 1000;
79   if(!_now) {
80     gettimeofday(&now, NULL);
81     _now = &now;
82   }
83   sub_timeval(*_now, period, lc);
84 }
85 void
86 noit_poller_load_checks() {
87   int i, cnt = 0;
88   noit_conf_section_t *sec;
89   __config_load_generation++;
90   sec = noit_conf_get_sections(NULL, "/noit/checks//check", &cnt);
91   for(i=0; i<cnt; i++) {
92     char uuid_str[37];
93     char target[256];
94     char module[256];
95     char name[256];
96     char oncheck[1024];
97     int no_period = 0;
98     int no_oncheck = 0;
99     int period = 0, timeout = 0;
100     uuid_t uuid, out_uuid;
101     noit_hash_table *options;
102
103     if(!noit_conf_get_stringbuf(sec[i], "@uuid",
104                                 uuid_str, sizeof(uuid_str))) {
105       noitL(noit_stderr, "check %d has no uuid\n", i+1);
106       continue;
107     }
108     if(uuid_parse(uuid_str, uuid)) {
109       noitL(noit_stderr, "check uuid: '%s' is invalid\n", uuid_str);
110       continue;
111     }
112     if(!noit_conf_get_stringbuf(sec[i], "ancestor-or-self::node()/target", target, sizeof(target))) {
113       noitL(noit_stderr, "check uuid: '%s' has no target\n",
114             uuid_str);
115       continue;
116     }
117     if(!noit_conf_get_stringbuf(sec[i], "ancestor-or-self::node()/module", module, sizeof(module))) {
118       noitL(noit_stderr, "check uuid: '%s' has no module\n",
119             uuid_str);
120       continue;
121     }
122     if(!noit_conf_get_stringbuf(sec[i], "name", name, sizeof(name))) {
123       strlcpy(name, module, sizeof(name));
124     }
125     if(!noit_conf_get_int(sec[i], "ancestor-or-self::node()/period", &period)) {
126       no_period = 1;
127     }
128     if(!noit_conf_get_stringbuf(sec[i], "ancestor-or-self::node()/oncheck", oncheck, sizeof(oncheck))) {
129       oncheck[0] = '\0';
130       no_oncheck = 1;
131     }
132     if(no_period && no_oncheck) {
133       noitL(noit_stderr, "check uuid: '%s' has neither period nor oncheck\n",
134             uuid_str);
135       continue;
136     }
137     if(!(no_period || no_oncheck)) {
138       noitL(noit_stderr, "check uuid: '%s' has has on check and period.\n",
139             uuid_str);
140       continue;
141     }
142     if(!noit_conf_get_int(sec[i], "ancestor-or-self::node()/timeout", &timeout)) {
143       noitL(noit_stderr, "check uuid: '%s' has no timeout\n", uuid_str);
144       continue;
145     }
146     if(!no_period && timeout >= period) {
147       noitL(noit_stderr, "check uuid: '%s' timeout > period\n", uuid_str);
148       timeout = period/2;
149     }
150     options = noit_conf_get_hash(sec[i], "ancestor-or-self::node()/config/*");
151     noit_poller_schedule(target, module, name, options,
152                          period, timeout, oncheck[0] ? oncheck : NULL,
153                          uuid, out_uuid);
154     noitL(noit_debug, "loaded uuid: %s\n", uuid_str);
155   }
156 }
157
158 void
159 noit_poller_initiate() {
160   noit_hash_iter iter = NOIT_HASH_ITER_ZERO;
161   uuid_t key_id;
162   int klen;
163   noit_check_t *check;
164   while(noit_hash_next(&polls, &iter, (const char **)key_id, &klen,
165                        (void **)&check)) {
166     noit_module_t *mod;
167     mod = noit_module_lookup(check->module);
168     if(mod) {
169       if((check->flags & NP_DISABLED) == 0)
170         mod->initiate_check(mod, check, 0, NULL);
171     }
172     else {
173       noitL(noit_stderr, "Cannot find module '%s'\n", check->module);
174       check->flags |= NP_DISABLED;
175     }
176   }
177 }
178
179 void
180 noit_poller_make_causal_map() {
181   noit_hash_iter iter = NOIT_HASH_ITER_ZERO;
182   uuid_t key_id;
183   int klen;
184   noit_check_t *check, *parent;
185   while(noit_hash_next(&polls, &iter, (const char **)key_id, &klen,
186                        (void **)&check)) {
187     if(check->oncheck) {
188       /* This service is causally triggered by another service */
189       char fullcheck[1024];
190       char *name = check->oncheck;
191       char *target = NULL;
192
193       if((target = strchr(check->oncheck, '`')) != NULL) {
194         strlcpy(fullcheck, check->oncheck, target - check->oncheck);
195         name = target + 1;
196         target = fullcheck;
197       }
198       else
199        target = check->target;
200
201       parent = noit_poller_lookup_by_name(target, name);
202       if(!parent) {
203         check->flags |= NP_DISABLED;
204         noitL(noit_stderr, "Disabling check %s/%s, can't find oncheck %s/%s\n",
205               check->target, check->name, target, name);
206       }
207       else {
208         dep_list_t *dep;
209         dep = malloc(sizeof(*dep));
210         dep->check = check;
211         dep->next = parent->causal_checks;
212         parent->causal_checks = dep;
213       }
214     }
215   }
216 }
217 void
218 noit_poller_init() {
219   noit_skiplist_init(&polls_by_name);
220   noit_skiplist_set_compare(&polls_by_name, __check_name_compare,
221                             __check_name_compare);
222   noit_poller_load_checks();
223   noit_poller_make_causal_map();
224   register_console_check_commands();
225   noit_poller_initiate();
226 }
227
228 int
229 noit_poller_schedule(const char *target,
230                      const char *module,
231                      const char *name,
232                      noit_hash_table *config,
233                      u_int32_t period,
234                      u_int32_t timeout,
235                      const char *oncheck,
236                      uuid_t in,
237                      uuid_t out) {
238   int8_t family;
239   int rv;
240   union {
241     struct in_addr addr4;
242     struct in6_addr addr6;
243   } a;
244   noit_check_t *new_check;
245
246
247   family = AF_INET;
248   rv = inet_pton(family, target, &a);
249   if(rv != 1) {
250     family = AF_INET6;
251     rv = inet_pton(family, target, &a);
252     if(rv != 1) {
253       noitL(noit_stderr, "Cannot translate '%s' to IP\n", target);
254       return -1;
255     }
256   }
257
258   new_check = calloc(1, sizeof(*new_check));
259   if(!new_check) return -1;
260   new_check->generation = __config_load_generation;
261   new_check->target_family = family;
262   memcpy(&new_check->target_addr, &a, sizeof(a));
263   new_check->target = strdup(target);
264   new_check->module = strdup(module);
265   new_check->name = name ? strdup(name): NULL;
266
267   if(config != NULL) {
268     noit_hash_iter iter = NOIT_HASH_ITER_ZERO;
269     const char *k;
270     int klen;
271     void *data;
272     new_check->config = calloc(1, sizeof(*new_check->config));
273     while(noit_hash_next(config, &iter, &k, &klen, &data)) {
274       noit_hash_store(new_check->config, strdup(k), klen, strdup((char *)data));
275     }
276   }
277   new_check->oncheck = oncheck ? strdup(oncheck) : NULL;
278   new_check->period = period;
279   new_check->timeout = timeout;
280   new_check->flags = 0;
281   if(uuid_is_null(in))
282     uuid_generate(new_check->checkid);
283   else
284     uuid_copy(new_check->checkid, in);
285
286   assert(noit_hash_store(&polls,
287                          (char *)new_check->checkid, UUID_SIZE,
288                          new_check));
289   noit_skiplist_insert(&polls_by_name, new_check);
290   uuid_copy(out, new_check->checkid);
291   return 0;
292 }
293
294 int
295 noit_poller_deschedule(uuid_t in) {
296   noit_check_t *checker;
297   if(noit_hash_retrieve(&polls,
298                         (char *)in, UUID_SIZE,
299                         (void **)&checker) == 0) {
300     return -1;
301   }
302   if(checker->flags & NP_RUNNING) {
303     checker->flags |= NP_KILLED;
304     return 0;
305   }
306   if(checker->fire_event) {
307      eventer_remove(checker->fire_event);
308      eventer_free(checker->fire_event);
309      checker->fire_event = NULL;
310   }
311   noit_hash_delete(&polls, (char *)in, UUID_SIZE, free, free);
312
313   if(checker->target) free(checker->target);
314   if(checker->module) free(checker->module);
315   if(checker->name) free(checker->name);
316   if(checker->config) {
317     noit_hash_destroy(checker->config, free, free);
318     free(checker->config);
319     checker->config = NULL;
320   }
321   free(checker);
322   return 0;
323 }
324
325 noit_check_t *
326 noit_poller_lookup(uuid_t in) {
327   noit_check_t *check;
328   if(noit_hash_retrieve(&polls,
329                         (char *)in, UUID_SIZE,
330                         (void **)&check)) {
331     return check;
332   }
333   return NULL;
334 }
335 noit_check_t *
336 noit_poller_lookup_by_name(char *target, char *name) {
337   noit_check_t *check, *tmp_check;
338   tmp_check = calloc(1, sizeof(*tmp_check));
339   tmp_check->target = target;
340   tmp_check->name = name;
341   check = noit_skiplist_find(&polls_by_name, tmp_check, NULL);
342   free(tmp_check);
343   return check;
344 }
345
346 static void
347 __free_metric(void *vm) {
348   metric_t *m = vm;
349   free(m->metric_name);
350   if(m->metric_value.i) free(m->metric_value.i);
351 }
352
353 void
354 __stats_add_metric(stats_t *newstate, metric_t *m) {
355   noit_hash_replace(&newstate->metrics, m->metric_name, strlen(m->metric_name),
356                     m, NULL, __free_metric);
357 }
358
359 void
360 noit_stats_set_metric_int(stats_t *newstate, char *name, int *value) {
361   metric_t *m = calloc(1, sizeof(*m));
362   m->metric_name = strdup(name);
363   m->metric_type = METRIC_INT;
364   if(value) {
365     m->metric_value.i = malloc(sizeof(*value));
366     *(m->metric_value.i) = *value;
367   }
368   __stats_add_metric(newstate, m);
369 }
370
371 void
372 noit_stats_set_metric_float(stats_t *newstate, char *name, float *value) {
373   metric_t *m = calloc(1, sizeof(*m));
374   m->metric_name = strdup(name);
375   m->metric_type = METRIC_FLOAT;
376   if(value) {
377     m->metric_value.f = malloc(sizeof(*value));
378     *(m->metric_value.f) = *value;
379   }
380   __stats_add_metric(newstate, m);
381 }
382
383 void
384 noit_stats_set_metric_string(stats_t *newstate, char *name, char *value) {
385   metric_t *m = calloc(1, sizeof(*m));
386   m->metric_name = strdup(name);
387   m->metric_type = METRIC_STRING;
388   m->metric_value.s = value ? strdup(value) : NULL;
389   __stats_add_metric(newstate, m);
390 }
391
392 void
393 noit_check_set_stats(struct _noit_module *module,
394                      noit_check_t *check, stats_t *newstate) {
395   int report_change = 0;
396   dep_list_t *dep;
397   if(check->stats.previous.status)
398     free(check->stats.previous.status);
399   noit_hash_destroy(&check->stats.previous.metrics, NULL, __free_metric);
400   memcpy(&check->stats.previous, &check->stats.current, sizeof(stats_t));
401   memcpy(&check->stats.current, newstate, sizeof(stats_t));
402   if(check->stats.current.status)
403     check->stats.current.status = strdup(check->stats.current.status);
404
405   /* check for state changes */
406   if(check->stats.current.available != 0 &&
407      check->stats.previous.available != 0 &&
408      check->stats.current.available != check->stats.previous.available)
409     report_change = 1;
410   if(check->stats.current.state != 0 &&
411      check->stats.previous.state != 0 &&
412      check->stats.current.state != check->stats.previous.state)
413     report_change = 1;
414
415   noitL(noit_error, "%s/%s <- [%s]\n", check->target, check->module,
416         check->stats.current.status);
417   if(report_change) {
418     noitL(noit_error, "%s/%s -> [%s/%s]\n",
419           check->target, check->module,
420           __noit_check_available_string(check->stats.current.available),
421           __noit_check_state_string(check->stats.current.state));
422   }
423   for(dep = check->causal_checks; dep; dep = dep->next) {
424     noit_module_t *mod;
425     mod = noit_module_lookup(dep->check->module);
426     assert(mod);
427     noitL(noit_debug, "Firing %s/%s in response to %s/%s\n",
428           dep->check->target, dep->check->name,
429           check->target, check->name);
430     mod->initiate_check(mod, dep->check, 1, check);
431   }
432 }
433
434 static void
435 nc_printf_check_brief(noit_console_closure_t ncct,
436                       noit_check_t *check) {
437   char out[512];
438   char uuid_str[41];
439   snprintf(out, sizeof(out), "%s/%s", check->target, check->name);
440   uuid_unparse_lower(check->checkid, uuid_str);
441   nc_printf(ncct, "%s %s\n", uuid_str, out);
442   if(check->stats.current.status)
443     nc_printf(ncct, "\t%s\n", check->stats.current.status);
444 }
445
446 static int
447 noit_console_show_checks(noit_console_closure_t ncct,
448                          int argc, char **argv,
449                          noit_console_state_t *dstate,
450                          void *closure) {
451   struct timeval _now;
452   noit_hash_iter iter = NOIT_HASH_ITER_ZERO;
453   uuid_t key_id;
454   int klen;
455   noit_check_t *check;
456
457   gettimeofday(&_now, NULL);
458   while(noit_hash_next(&polls, &iter, (const char **)key_id, &klen,
459                        (void **)&check)) {
460     nc_printf_check_brief(ncct, check);
461   }
462   return 0;
463 }
464 static void
465 register_console_check_commands() {
466   noit_console_state_t *tl;
467   cmd_info_t *showcmd;
468
469   tl = noit_console_state_initial();
470   showcmd = noit_console_state_get_cmd(tl, "show");
471   assert(showcmd && showcmd->dstate);
472
473   noit_console_state_add_cmd(showcmd->dstate,
474     NCSCMD("checks", noit_console_show_checks, NULL, NULL));
475 }
476
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