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ab0ee2ca | 1 | /* |
ab5be9fa | 2 | * Copyright (C) 2017 Jérémie Galarneau <jeremie.galarneau@efficios.com> |
ab0ee2ca | 3 | * |
ab5be9fa | 4 | * SPDX-License-Identifier: GPL-2.0-only |
ab0ee2ca | 5 | * |
ab0ee2ca JG |
6 | */ |
7 | ||
8 | #define _LGPL_SOURCE | |
9 | #include <urcu.h> | |
10 | #include <urcu/rculfhash.h> | |
11 | ||
ab0ee2ca JG |
12 | #include <common/defaults.h> |
13 | #include <common/error.h> | |
14 | #include <common/futex.h> | |
15 | #include <common/unix.h> | |
16 | #include <common/dynamic-buffer.h> | |
17 | #include <common/hashtable/utils.h> | |
18 | #include <common/sessiond-comm/sessiond-comm.h> | |
19 | #include <common/macros.h> | |
20 | #include <lttng/condition/condition.h> | |
9b63a4aa | 21 | #include <lttng/action/action-internal.h> |
1831ae68 | 22 | #include <lttng/action/group-internal.h> |
ab0ee2ca JG |
23 | #include <lttng/notification/notification-internal.h> |
24 | #include <lttng/condition/condition-internal.h> | |
25 | #include <lttng/condition/buffer-usage-internal.h> | |
e8360425 | 26 | #include <lttng/condition/session-consumed-size-internal.h> |
ea9a44f0 | 27 | #include <lttng/condition/session-rotation-internal.h> |
1831ae68 | 28 | #include <lttng/condition/event-rule-internal.h> |
ab0ee2ca | 29 | #include <lttng/notification/channel-internal.h> |
1831ae68 | 30 | #include <lttng/trigger/trigger-internal.h> |
1da26331 | 31 | |
ab0ee2ca JG |
32 | #include <time.h> |
33 | #include <unistd.h> | |
34 | #include <assert.h> | |
35 | #include <inttypes.h> | |
d53ea4e4 | 36 | #include <fcntl.h> |
ab0ee2ca | 37 | |
1da26331 JG |
38 | #include "notification-thread.h" |
39 | #include "notification-thread-events.h" | |
40 | #include "notification-thread-commands.h" | |
41 | #include "lttng-sessiond.h" | |
42 | #include "kernel.h" | |
43 | ||
ab0ee2ca JG |
44 | #define CLIENT_POLL_MASK_IN (LPOLLIN | LPOLLERR | LPOLLHUP | LPOLLRDHUP) |
45 | #define CLIENT_POLL_MASK_IN_OUT (CLIENT_POLL_MASK_IN | LPOLLOUT) | |
46 | ||
51eab943 JG |
47 | enum lttng_object_type { |
48 | LTTNG_OBJECT_TYPE_UNKNOWN, | |
49 | LTTNG_OBJECT_TYPE_NONE, | |
50 | LTTNG_OBJECT_TYPE_CHANNEL, | |
51 | LTTNG_OBJECT_TYPE_SESSION, | |
52 | }; | |
53 | ||
ab0ee2ca | 54 | struct lttng_trigger_list_element { |
9e0bb80e | 55 | /* No ownership of the trigger object is assumed. */ |
1831ae68 | 56 | struct lttng_trigger *trigger; |
ab0ee2ca JG |
57 | struct cds_list_head node; |
58 | }; | |
59 | ||
60 | struct lttng_channel_trigger_list { | |
61 | struct channel_key channel_key; | |
ea9a44f0 | 62 | /* List of struct lttng_trigger_list_element. */ |
ab0ee2ca | 63 | struct cds_list_head list; |
ea9a44f0 | 64 | /* Node in the channel_triggers_ht */ |
ab0ee2ca | 65 | struct cds_lfht_node channel_triggers_ht_node; |
83b934ad MD |
66 | /* call_rcu delayed reclaim. */ |
67 | struct rcu_head rcu_node; | |
ab0ee2ca JG |
68 | }; |
69 | ||
ea9a44f0 JG |
70 | /* |
71 | * List of triggers applying to a given session. | |
72 | * | |
73 | * See: | |
74 | * - lttng_session_trigger_list_create() | |
75 | * - lttng_session_trigger_list_build() | |
76 | * - lttng_session_trigger_list_destroy() | |
77 | * - lttng_session_trigger_list_add() | |
78 | */ | |
79 | struct lttng_session_trigger_list { | |
80 | /* | |
81 | * Not owned by this; points to the session_info structure's | |
82 | * session name. | |
83 | */ | |
84 | const char *session_name; | |
85 | /* List of struct lttng_trigger_list_element. */ | |
86 | struct cds_list_head list; | |
87 | /* Node in the session_triggers_ht */ | |
88 | struct cds_lfht_node session_triggers_ht_node; | |
89 | /* | |
90 | * Weak reference to the notification system's session triggers | |
91 | * hashtable. | |
92 | * | |
93 | * The session trigger list structure structure is owned by | |
94 | * the session's session_info. | |
95 | * | |
96 | * The session_info is kept alive the the channel_infos holding a | |
97 | * reference to it (reference counting). When those channels are | |
98 | * destroyed (at runtime or on teardown), the reference they hold | |
99 | * to the session_info are released. On destruction of session_info, | |
100 | * session_info_destroy() will remove the list of triggers applying | |
101 | * to this session from the notification system's state. | |
102 | * | |
103 | * This implies that the session_triggers_ht must be destroyed | |
104 | * after the channels. | |
105 | */ | |
106 | struct cds_lfht *session_triggers_ht; | |
107 | /* Used for delayed RCU reclaim. */ | |
108 | struct rcu_head rcu_node; | |
109 | }; | |
110 | ||
ab0ee2ca JG |
111 | struct lttng_trigger_ht_element { |
112 | struct lttng_trigger *trigger; | |
113 | struct cds_lfht_node node; | |
1831ae68 | 114 | struct cds_lfht_node node_by_name; |
83b934ad MD |
115 | /* call_rcu delayed reclaim. */ |
116 | struct rcu_head rcu_node; | |
ab0ee2ca JG |
117 | }; |
118 | ||
119 | struct lttng_condition_list_element { | |
120 | struct lttng_condition *condition; | |
121 | struct cds_list_head node; | |
122 | }; | |
123 | ||
1831ae68 FD |
124 | /* |
125 | * Facilities to carry the different notifications type in the action processing | |
126 | * code path. | |
127 | */ | |
128 | struct lttng_trigger_notification { | |
129 | union { | |
130 | struct lttng_ust_trigger_notification *ust; | |
131 | uint64_t *kernel; | |
132 | } u; | |
133 | uint64_t id; | |
134 | enum lttng_domain_type type; | |
ab0ee2ca JG |
135 | }; |
136 | ||
137 | struct channel_state_sample { | |
138 | struct channel_key key; | |
139 | struct cds_lfht_node channel_state_ht_node; | |
140 | uint64_t highest_usage; | |
141 | uint64_t lowest_usage; | |
e8360425 | 142 | uint64_t channel_total_consumed; |
83b934ad MD |
143 | /* call_rcu delayed reclaim. */ |
144 | struct rcu_head rcu_node; | |
ab0ee2ca JG |
145 | }; |
146 | ||
e4db5ace | 147 | static unsigned long hash_channel_key(struct channel_key *key); |
ed327204 | 148 | static int evaluate_buffer_condition(const struct lttng_condition *condition, |
e4db5ace | 149 | struct lttng_evaluation **evaluation, |
e8360425 JD |
150 | const struct notification_thread_state *state, |
151 | const struct channel_state_sample *previous_sample, | |
152 | const struct channel_state_sample *latest_sample, | |
153 | uint64_t previous_session_consumed_total, | |
154 | uint64_t latest_session_consumed_total, | |
155 | struct channel_info *channel_info); | |
e4db5ace | 156 | static |
9b63a4aa JG |
157 | int send_evaluation_to_clients(const struct lttng_trigger *trigger, |
158 | const struct lttng_evaluation *evaluation, | |
e4db5ace JR |
159 | struct notification_client_list *client_list, |
160 | struct notification_thread_state *state, | |
161 | uid_t channel_uid, gid_t channel_gid); | |
162 | ||
8abe313a | 163 | |
ea9a44f0 | 164 | /* session_info API */ |
8abe313a JG |
165 | static |
166 | void session_info_destroy(void *_data); | |
167 | static | |
168 | void session_info_get(struct session_info *session_info); | |
169 | static | |
170 | void session_info_put(struct session_info *session_info); | |
171 | static | |
172 | struct session_info *session_info_create(const char *name, | |
ea9a44f0 | 173 | uid_t uid, gid_t gid, |
1eee26c5 JG |
174 | struct lttng_session_trigger_list *trigger_list, |
175 | struct cds_lfht *sessions_ht); | |
8abe313a JG |
176 | static |
177 | void session_info_add_channel(struct session_info *session_info, | |
178 | struct channel_info *channel_info); | |
179 | static | |
180 | void session_info_remove_channel(struct session_info *session_info, | |
181 | struct channel_info *channel_info); | |
182 | ||
ea9a44f0 JG |
183 | /* lttng_session_trigger_list API */ |
184 | static | |
185 | struct lttng_session_trigger_list *lttng_session_trigger_list_create( | |
186 | const char *session_name, | |
187 | struct cds_lfht *session_triggers_ht); | |
188 | static | |
189 | struct lttng_session_trigger_list *lttng_session_trigger_list_build( | |
190 | const struct notification_thread_state *state, | |
191 | const char *session_name); | |
192 | static | |
193 | void lttng_session_trigger_list_destroy( | |
194 | struct lttng_session_trigger_list *list); | |
195 | static | |
196 | int lttng_session_trigger_list_add(struct lttng_session_trigger_list *list, | |
1831ae68 | 197 | struct lttng_trigger *trigger); |
ea9a44f0 JG |
198 | |
199 | ||
ab0ee2ca | 200 | static |
1831ae68 | 201 | int match_client_socket(struct cds_lfht_node *node, const void *key) |
ab0ee2ca JG |
202 | { |
203 | /* This double-cast is intended to supress pointer-to-cast warning. */ | |
1831ae68 FD |
204 | const int socket = (int) (intptr_t) key; |
205 | const struct notification_client *client = caa_container_of(node, | |
206 | struct notification_client, client_socket_ht_node); | |
ab0ee2ca | 207 | |
1831ae68 FD |
208 | return client->socket == socket; |
209 | } | |
ab0ee2ca | 210 | |
1831ae68 FD |
211 | static |
212 | int match_client_id(struct cds_lfht_node *node, const void *key) | |
213 | { | |
214 | /* This double-cast is intended to supress pointer-to-cast warning. */ | |
215 | const notification_client_id id = *((notification_client_id *) key); | |
216 | const struct notification_client *client = caa_container_of( | |
217 | node, struct notification_client, client_id_ht_node); | |
218 | ||
219 | return client->id == id; | |
ab0ee2ca JG |
220 | } |
221 | ||
222 | static | |
223 | int match_channel_trigger_list(struct cds_lfht_node *node, const void *key) | |
224 | { | |
225 | struct channel_key *channel_key = (struct channel_key *) key; | |
226 | struct lttng_channel_trigger_list *trigger_list; | |
227 | ||
228 | trigger_list = caa_container_of(node, struct lttng_channel_trigger_list, | |
229 | channel_triggers_ht_node); | |
230 | ||
231 | return !!((channel_key->key == trigger_list->channel_key.key) && | |
232 | (channel_key->domain == trigger_list->channel_key.domain)); | |
233 | } | |
234 | ||
51eab943 JG |
235 | static |
236 | int match_session_trigger_list(struct cds_lfht_node *node, const void *key) | |
237 | { | |
238 | const char *session_name = (const char *) key; | |
239 | struct lttng_session_trigger_list *trigger_list; | |
240 | ||
241 | trigger_list = caa_container_of(node, struct lttng_session_trigger_list, | |
242 | session_triggers_ht_node); | |
243 | ||
244 | return !!(strcmp(trigger_list->session_name, session_name) == 0); | |
245 | } | |
246 | ||
ab0ee2ca JG |
247 | static |
248 | int match_channel_state_sample(struct cds_lfht_node *node, const void *key) | |
249 | { | |
250 | struct channel_key *channel_key = (struct channel_key *) key; | |
251 | struct channel_state_sample *sample; | |
252 | ||
253 | sample = caa_container_of(node, struct channel_state_sample, | |
254 | channel_state_ht_node); | |
255 | ||
256 | return !!((channel_key->key == sample->key.key) && | |
257 | (channel_key->domain == sample->key.domain)); | |
258 | } | |
259 | ||
260 | static | |
261 | int match_channel_info(struct cds_lfht_node *node, const void *key) | |
262 | { | |
263 | struct channel_key *channel_key = (struct channel_key *) key; | |
264 | struct channel_info *channel_info; | |
265 | ||
266 | channel_info = caa_container_of(node, struct channel_info, | |
267 | channels_ht_node); | |
268 | ||
269 | return !!((channel_key->key == channel_info->key.key) && | |
270 | (channel_key->domain == channel_info->key.domain)); | |
271 | } | |
272 | ||
273 | static | |
1831ae68 | 274 | int match_trigger(struct cds_lfht_node *node, const void *key) |
ab0ee2ca | 275 | { |
1831ae68 FD |
276 | bool match = false; |
277 | struct lttng_trigger *trigger_key = (struct lttng_trigger *) key; | |
278 | struct lttng_trigger_ht_element *trigger_ht_element; | |
279 | const struct lttng_credentials *creds_key; | |
280 | const struct lttng_credentials *creds_node; | |
ab0ee2ca | 281 | |
1831ae68 | 282 | trigger_ht_element = caa_container_of(node, struct lttng_trigger_ht_element, |
ab0ee2ca | 283 | node); |
ab0ee2ca | 284 | |
1831ae68 FD |
285 | match = lttng_trigger_is_equal(trigger_key, trigger_ht_element->trigger); |
286 | if (!match) { | |
287 | goto end; | |
288 | } | |
289 | ||
290 | /* Validate credential */ | |
291 | /* TODO: this could be moved to lttng_trigger_equal depending on how we | |
292 | * handle root behaviour on disable and listing. | |
293 | */ | |
294 | creds_key = lttng_trigger_get_credentials(trigger_key); | |
295 | creds_node = lttng_trigger_get_credentials(trigger_ht_element->trigger); | |
296 | match = lttng_credentials_is_equal(creds_key, creds_node); | |
297 | end: | |
298 | return !!match; | |
299 | } | |
300 | ||
301 | static | |
302 | int match_trigger_token(struct cds_lfht_node *node, const void *key) | |
303 | { | |
304 | const uint64_t *_key = key; | |
305 | struct notification_trigger_tokens_ht_element *element; | |
306 | ||
307 | element = caa_container_of(node, struct notification_trigger_tokens_ht_element, | |
308 | node); | |
309 | return *_key == element->token ; | |
ab0ee2ca JG |
310 | } |
311 | ||
ab0ee2ca JG |
312 | static |
313 | int match_client_list_condition(struct cds_lfht_node *node, const void *key) | |
314 | { | |
315 | struct lttng_condition *condition_key = (struct lttng_condition *) key; | |
316 | struct notification_client_list *client_list; | |
f82f93a1 | 317 | const struct lttng_condition *condition; |
ab0ee2ca JG |
318 | |
319 | assert(condition_key); | |
320 | ||
321 | client_list = caa_container_of(node, struct notification_client_list, | |
1831ae68 | 322 | notification_trigger_clients_ht_node); |
f82f93a1 | 323 | condition = lttng_trigger_get_const_condition(client_list->trigger); |
ab0ee2ca JG |
324 | |
325 | return !!lttng_condition_is_equal(condition_key, condition); | |
326 | } | |
327 | ||
f82f93a1 JG |
328 | static |
329 | int match_session(struct cds_lfht_node *node, const void *key) | |
330 | { | |
331 | const char *name = key; | |
332 | struct session_info *session_info = caa_container_of( | |
333 | node, struct session_info, sessions_ht_node); | |
334 | ||
335 | return !strcmp(session_info->name, name); | |
336 | } | |
337 | ||
1831ae68 FD |
338 | /* |
339 | * Match function for string node. | |
340 | */ | |
341 | static int match_str(struct cds_lfht_node *node, const void *key) | |
342 | { | |
343 | struct lttng_trigger_ht_element *trigger_ht_element; | |
344 | const char *name; | |
345 | ||
346 | trigger_ht_element = caa_container_of(node, struct lttng_trigger_ht_element, | |
347 | node_by_name); | |
348 | ||
349 | /* TODO error checking */ | |
350 | lttng_trigger_get_name(trigger_ht_element->trigger, &name); | |
351 | ||
352 | return hash_match_key_str(name, (void *) key); | |
353 | } | |
354 | ||
ab0ee2ca JG |
355 | static |
356 | unsigned long lttng_condition_buffer_usage_hash( | |
9b63a4aa | 357 | const struct lttng_condition *_condition) |
ab0ee2ca | 358 | { |
9a2746aa JG |
359 | unsigned long hash; |
360 | unsigned long condition_type; | |
ab0ee2ca JG |
361 | struct lttng_condition_buffer_usage *condition; |
362 | ||
363 | condition = container_of(_condition, | |
364 | struct lttng_condition_buffer_usage, parent); | |
365 | ||
9a2746aa JG |
366 | condition_type = (unsigned long) condition->parent.type; |
367 | hash = hash_key_ulong((void *) condition_type, lttng_ht_seed); | |
ab0ee2ca JG |
368 | if (condition->session_name) { |
369 | hash ^= hash_key_str(condition->session_name, lttng_ht_seed); | |
370 | } | |
371 | if (condition->channel_name) { | |
8f56701f | 372 | hash ^= hash_key_str(condition->channel_name, lttng_ht_seed); |
ab0ee2ca JG |
373 | } |
374 | if (condition->domain.set) { | |
375 | hash ^= hash_key_ulong( | |
376 | (void *) condition->domain.type, | |
377 | lttng_ht_seed); | |
378 | } | |
379 | if (condition->threshold_ratio.set) { | |
380 | uint64_t val; | |
381 | ||
382 | val = condition->threshold_ratio.value * (double) UINT32_MAX; | |
383 | hash ^= hash_key_u64(&val, lttng_ht_seed); | |
6633b0dd | 384 | } else if (condition->threshold_bytes.set) { |
ab0ee2ca JG |
385 | uint64_t val; |
386 | ||
387 | val = condition->threshold_bytes.value; | |
388 | hash ^= hash_key_u64(&val, lttng_ht_seed); | |
389 | } | |
390 | return hash; | |
391 | } | |
392 | ||
e8360425 JD |
393 | static |
394 | unsigned long lttng_condition_session_consumed_size_hash( | |
9b63a4aa | 395 | const struct lttng_condition *_condition) |
e8360425 | 396 | { |
9a2746aa JG |
397 | unsigned long hash; |
398 | unsigned long condition_type = | |
399 | (unsigned long) LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE; | |
e8360425 JD |
400 | struct lttng_condition_session_consumed_size *condition; |
401 | uint64_t val; | |
402 | ||
403 | condition = container_of(_condition, | |
404 | struct lttng_condition_session_consumed_size, parent); | |
405 | ||
9a2746aa | 406 | hash = hash_key_ulong((void *) condition_type, lttng_ht_seed); |
e8360425 JD |
407 | if (condition->session_name) { |
408 | hash ^= hash_key_str(condition->session_name, lttng_ht_seed); | |
409 | } | |
410 | val = condition->consumed_threshold_bytes.value; | |
411 | hash ^= hash_key_u64(&val, lttng_ht_seed); | |
412 | return hash; | |
413 | } | |
414 | ||
a8393880 JG |
415 | static |
416 | unsigned long lttng_condition_session_rotation_hash( | |
417 | const struct lttng_condition *_condition) | |
418 | { | |
419 | unsigned long hash, condition_type; | |
420 | struct lttng_condition_session_rotation *condition; | |
421 | ||
422 | condition = container_of(_condition, | |
423 | struct lttng_condition_session_rotation, parent); | |
424 | condition_type = (unsigned long) condition->parent.type; | |
425 | hash = hash_key_ulong((void *) condition_type, lttng_ht_seed); | |
426 | assert(condition->session_name); | |
427 | hash ^= hash_key_str(condition->session_name, lttng_ht_seed); | |
428 | return hash; | |
429 | } | |
9a2746aa | 430 | |
1831ae68 FD |
431 | static |
432 | unsigned long lttng_condition_event_rule_hash( | |
433 | const struct lttng_condition *_condition) | |
434 | { | |
435 | unsigned long hash, condition_type; | |
436 | struct lttng_condition_event_rule *condition; | |
437 | ||
438 | condition = container_of(_condition, | |
439 | struct lttng_condition_event_rule, parent); | |
440 | condition_type = (unsigned long) condition->parent.type; | |
441 | hash = hash_key_ulong((void *) condition_type, lttng_ht_seed); | |
442 | ||
443 | /* TODO: further hasg using the event rule? on pattern maybe?*/ | |
444 | return hash; | |
445 | } | |
446 | ||
ab0ee2ca JG |
447 | /* |
448 | * The lttng_condition hashing code is kept in this file (rather than | |
449 | * condition.c) since it makes use of GPLv2 code (hashtable utils), which we | |
450 | * don't want to link in liblttng-ctl. | |
451 | */ | |
452 | static | |
9b63a4aa | 453 | unsigned long lttng_condition_hash(const struct lttng_condition *condition) |
ab0ee2ca JG |
454 | { |
455 | switch (condition->type) { | |
456 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
457 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
458 | return lttng_condition_buffer_usage_hash(condition); | |
e8360425 JD |
459 | case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE: |
460 | return lttng_condition_session_consumed_size_hash(condition); | |
a8393880 JG |
461 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING: |
462 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED: | |
463 | return lttng_condition_session_rotation_hash(condition); | |
1831ae68 FD |
464 | case LTTNG_CONDITION_TYPE_EVENT_RULE_HIT: |
465 | return lttng_condition_event_rule_hash(condition); | |
ab0ee2ca JG |
466 | default: |
467 | ERR("[notification-thread] Unexpected condition type caught"); | |
468 | abort(); | |
469 | } | |
470 | } | |
471 | ||
e4db5ace JR |
472 | static |
473 | unsigned long hash_channel_key(struct channel_key *key) | |
474 | { | |
475 | unsigned long key_hash = hash_key_u64(&key->key, lttng_ht_seed); | |
476 | unsigned long domain_hash = hash_key_ulong( | |
477 | (void *) (unsigned long) key->domain, lttng_ht_seed); | |
478 | ||
479 | return key_hash ^ domain_hash; | |
480 | } | |
481 | ||
1831ae68 FD |
482 | static |
483 | unsigned long hash_client_socket(int socket) | |
484 | { | |
485 | return hash_key_ulong((void *) (unsigned long) socket, lttng_ht_seed); | |
486 | } | |
487 | ||
488 | static | |
489 | unsigned long hash_client_id(notification_client_id id) | |
490 | { | |
491 | return hash_key_u64(&id, lttng_ht_seed); | |
492 | } | |
493 | ||
f82f93a1 JG |
494 | /* |
495 | * Get the type of object to which a given condition applies. Bindings let | |
496 | * the notification system evaluate a trigger's condition when a given | |
497 | * object's state is updated. | |
498 | * | |
499 | * For instance, a condition bound to a channel will be evaluated everytime | |
500 | * the channel's state is changed by a channel monitoring sample. | |
501 | */ | |
502 | static | |
503 | enum lttng_object_type get_condition_binding_object( | |
504 | const struct lttng_condition *condition) | |
505 | { | |
506 | switch (lttng_condition_get_type(condition)) { | |
507 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
508 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
509 | case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE: | |
510 | return LTTNG_OBJECT_TYPE_CHANNEL; | |
511 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING: | |
512 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED: | |
513 | return LTTNG_OBJECT_TYPE_SESSION; | |
1831ae68 FD |
514 | case LTTNG_CONDITION_TYPE_EVENT_RULE_HIT: |
515 | return LTTNG_OBJECT_TYPE_NONE; | |
f82f93a1 JG |
516 | default: |
517 | return LTTNG_OBJECT_TYPE_UNKNOWN; | |
518 | } | |
519 | } | |
520 | ||
83b934ad MD |
521 | static |
522 | void free_channel_info_rcu(struct rcu_head *node) | |
523 | { | |
524 | free(caa_container_of(node, struct channel_info, rcu_node)); | |
525 | } | |
526 | ||
ab0ee2ca JG |
527 | static |
528 | void channel_info_destroy(struct channel_info *channel_info) | |
529 | { | |
530 | if (!channel_info) { | |
531 | return; | |
532 | } | |
533 | ||
8abe313a JG |
534 | if (channel_info->session_info) { |
535 | session_info_remove_channel(channel_info->session_info, | |
536 | channel_info); | |
537 | session_info_put(channel_info->session_info); | |
ab0ee2ca | 538 | } |
8abe313a JG |
539 | if (channel_info->name) { |
540 | free(channel_info->name); | |
ab0ee2ca | 541 | } |
83b934ad MD |
542 | call_rcu(&channel_info->rcu_node, free_channel_info_rcu); |
543 | } | |
544 | ||
545 | static | |
546 | void free_session_info_rcu(struct rcu_head *node) | |
547 | { | |
548 | free(caa_container_of(node, struct session_info, rcu_node)); | |
ab0ee2ca JG |
549 | } |
550 | ||
8abe313a | 551 | /* Don't call directly, use the ref-counting mechanism. */ |
ab0ee2ca | 552 | static |
8abe313a | 553 | void session_info_destroy(void *_data) |
ab0ee2ca | 554 | { |
8abe313a | 555 | struct session_info *session_info = _data; |
3b68d0a3 | 556 | int ret; |
ab0ee2ca | 557 | |
8abe313a JG |
558 | assert(session_info); |
559 | if (session_info->channel_infos_ht) { | |
3b68d0a3 JR |
560 | ret = cds_lfht_destroy(session_info->channel_infos_ht, NULL); |
561 | if (ret) { | |
4c3f302b | 562 | ERR("[notification-thread] Failed to destroy channel information hash table"); |
3b68d0a3 | 563 | } |
8abe313a | 564 | } |
ea9a44f0 | 565 | lttng_session_trigger_list_destroy(session_info->trigger_list); |
1eee26c5 JG |
566 | |
567 | rcu_read_lock(); | |
568 | cds_lfht_del(session_info->sessions_ht, | |
569 | &session_info->sessions_ht_node); | |
570 | rcu_read_unlock(); | |
8abe313a | 571 | free(session_info->name); |
83b934ad | 572 | call_rcu(&session_info->rcu_node, free_session_info_rcu); |
8abe313a | 573 | } |
ab0ee2ca | 574 | |
8abe313a JG |
575 | static |
576 | void session_info_get(struct session_info *session_info) | |
577 | { | |
578 | if (!session_info) { | |
579 | return; | |
580 | } | |
581 | lttng_ref_get(&session_info->ref); | |
582 | } | |
583 | ||
584 | static | |
585 | void session_info_put(struct session_info *session_info) | |
586 | { | |
587 | if (!session_info) { | |
588 | return; | |
ab0ee2ca | 589 | } |
8abe313a JG |
590 | lttng_ref_put(&session_info->ref); |
591 | } | |
592 | ||
593 | static | |
ea9a44f0 | 594 | struct session_info *session_info_create(const char *name, uid_t uid, gid_t gid, |
1eee26c5 JG |
595 | struct lttng_session_trigger_list *trigger_list, |
596 | struct cds_lfht *sessions_ht) | |
8abe313a JG |
597 | { |
598 | struct session_info *session_info; | |
ab0ee2ca | 599 | |
8abe313a | 600 | assert(name); |
ab0ee2ca | 601 | |
8abe313a JG |
602 | session_info = zmalloc(sizeof(*session_info)); |
603 | if (!session_info) { | |
604 | goto end; | |
605 | } | |
606 | lttng_ref_init(&session_info->ref, session_info_destroy); | |
607 | ||
608 | session_info->channel_infos_ht = cds_lfht_new(DEFAULT_HT_SIZE, | |
609 | 1, 0, CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, NULL); | |
610 | if (!session_info->channel_infos_ht) { | |
ab0ee2ca JG |
611 | goto error; |
612 | } | |
8abe313a JG |
613 | |
614 | cds_lfht_node_init(&session_info->sessions_ht_node); | |
615 | session_info->name = strdup(name); | |
616 | if (!session_info->name) { | |
ab0ee2ca JG |
617 | goto error; |
618 | } | |
8abe313a JG |
619 | session_info->uid = uid; |
620 | session_info->gid = gid; | |
ea9a44f0 | 621 | session_info->trigger_list = trigger_list; |
1eee26c5 | 622 | session_info->sessions_ht = sessions_ht; |
8abe313a JG |
623 | end: |
624 | return session_info; | |
625 | error: | |
626 | session_info_put(session_info); | |
627 | return NULL; | |
628 | } | |
629 | ||
630 | static | |
631 | void session_info_add_channel(struct session_info *session_info, | |
632 | struct channel_info *channel_info) | |
633 | { | |
634 | rcu_read_lock(); | |
635 | cds_lfht_add(session_info->channel_infos_ht, | |
636 | hash_channel_key(&channel_info->key), | |
637 | &channel_info->session_info_channels_ht_node); | |
638 | rcu_read_unlock(); | |
639 | } | |
640 | ||
641 | static | |
642 | void session_info_remove_channel(struct session_info *session_info, | |
643 | struct channel_info *channel_info) | |
644 | { | |
645 | rcu_read_lock(); | |
646 | cds_lfht_del(session_info->channel_infos_ht, | |
647 | &channel_info->session_info_channels_ht_node); | |
648 | rcu_read_unlock(); | |
649 | } | |
650 | ||
651 | static | |
652 | struct channel_info *channel_info_create(const char *channel_name, | |
653 | struct channel_key *channel_key, uint64_t channel_capacity, | |
654 | struct session_info *session_info) | |
655 | { | |
656 | struct channel_info *channel_info = zmalloc(sizeof(*channel_info)); | |
657 | ||
658 | if (!channel_info) { | |
659 | goto end; | |
660 | } | |
661 | ||
ab0ee2ca | 662 | cds_lfht_node_init(&channel_info->channels_ht_node); |
8abe313a JG |
663 | cds_lfht_node_init(&channel_info->session_info_channels_ht_node); |
664 | memcpy(&channel_info->key, channel_key, sizeof(*channel_key)); | |
665 | channel_info->capacity = channel_capacity; | |
666 | ||
667 | channel_info->name = strdup(channel_name); | |
668 | if (!channel_info->name) { | |
669 | goto error; | |
670 | } | |
671 | ||
672 | /* | |
673 | * Set the references between session and channel infos: | |
674 | * - channel_info holds a strong reference to session_info | |
675 | * - session_info holds a weak reference to channel_info | |
676 | */ | |
677 | session_info_get(session_info); | |
678 | session_info_add_channel(session_info, channel_info); | |
679 | channel_info->session_info = session_info; | |
ab0ee2ca | 680 | end: |
8abe313a | 681 | return channel_info; |
ab0ee2ca | 682 | error: |
8abe313a | 683 | channel_info_destroy(channel_info); |
ab0ee2ca JG |
684 | return NULL; |
685 | } | |
686 | ||
1831ae68 FD |
687 | LTTNG_HIDDEN |
688 | bool notification_client_list_get(struct notification_client_list *list) | |
689 | { | |
690 | return urcu_ref_get_unless_zero(&list->ref); | |
691 | } | |
692 | ||
693 | static | |
694 | void free_notification_client_list_rcu(struct rcu_head *node) | |
695 | { | |
696 | free(caa_container_of(node, struct notification_client_list, | |
697 | rcu_node)); | |
698 | } | |
699 | ||
700 | static | |
701 | void notification_client_list_release(struct urcu_ref *list_ref) | |
702 | { | |
703 | struct notification_client_list *list = | |
704 | container_of(list_ref, typeof(*list), ref); | |
705 | struct notification_client_list_element *client_list_element, *tmp; | |
706 | ||
707 | if (list->notification_trigger_clients_ht) { | |
708 | rcu_read_lock(); | |
709 | cds_lfht_del(list->notification_trigger_clients_ht, | |
710 | &list->notification_trigger_clients_ht_node); | |
711 | rcu_read_unlock(); | |
712 | list->notification_trigger_clients_ht = NULL; | |
713 | } | |
714 | cds_list_for_each_entry_safe(client_list_element, tmp, | |
715 | &list->list, node) { | |
716 | free(client_list_element); | |
717 | } | |
718 | pthread_mutex_destroy(&list->lock); | |
719 | call_rcu(&list->rcu_node, free_notification_client_list_rcu); | |
720 | } | |
721 | ||
722 | static | |
723 | struct notification_client_list *notification_client_list_create( | |
724 | const struct lttng_trigger *trigger) | |
725 | { | |
726 | struct notification_client_list *client_list = | |
727 | zmalloc(sizeof(*client_list)); | |
728 | ||
729 | if (!client_list) { | |
730 | goto error; | |
731 | } | |
732 | pthread_mutex_init(&client_list->lock, NULL); | |
733 | urcu_ref_init(&client_list->ref); | |
734 | cds_lfht_node_init(&client_list->notification_trigger_clients_ht_node); | |
735 | CDS_INIT_LIST_HEAD(&client_list->list); | |
736 | client_list->trigger = trigger; | |
737 | error: | |
738 | return client_list; | |
739 | } | |
740 | ||
741 | static | |
742 | void publish_notification_client_list( | |
743 | struct notification_thread_state *state, | |
744 | struct notification_client_list *list) | |
745 | { | |
746 | const struct lttng_condition *condition = | |
747 | lttng_trigger_get_const_condition(list->trigger); | |
748 | ||
749 | assert(!list->notification_trigger_clients_ht); | |
750 | ||
751 | list->notification_trigger_clients_ht = | |
752 | state->notification_trigger_clients_ht; | |
753 | ||
754 | rcu_read_lock(); | |
755 | cds_lfht_add(state->notification_trigger_clients_ht, | |
756 | lttng_condition_hash(condition), | |
757 | &list->notification_trigger_clients_ht_node); | |
758 | rcu_read_unlock(); | |
759 | } | |
760 | ||
761 | LTTNG_HIDDEN | |
762 | void notification_client_list_put(struct notification_client_list *list) | |
763 | { | |
764 | if (!list) { | |
765 | return; | |
766 | } | |
767 | return urcu_ref_put(&list->ref, notification_client_list_release); | |
768 | } | |
769 | ||
770 | /* Provides a reference to the returned list. */ | |
ed327204 JG |
771 | static |
772 | struct notification_client_list *get_client_list_from_condition( | |
773 | struct notification_thread_state *state, | |
774 | const struct lttng_condition *condition) | |
775 | { | |
776 | struct cds_lfht_node *node; | |
777 | struct cds_lfht_iter iter; | |
1831ae68 | 778 | struct notification_client_list *list = NULL; |
ed327204 | 779 | |
1831ae68 | 780 | rcu_read_lock(); |
ed327204 JG |
781 | cds_lfht_lookup(state->notification_trigger_clients_ht, |
782 | lttng_condition_hash(condition), | |
783 | match_client_list_condition, | |
784 | condition, | |
785 | &iter); | |
786 | node = cds_lfht_iter_get_node(&iter); | |
1831ae68 FD |
787 | if (node) { |
788 | list = container_of(node, struct notification_client_list, | |
789 | notification_trigger_clients_ht_node); | |
790 | list = notification_client_list_get(list) ? list : NULL; | |
791 | } | |
792 | rcu_read_unlock(); | |
793 | return list; | |
ed327204 JG |
794 | } |
795 | ||
e4db5ace | 796 | static |
f82f93a1 JG |
797 | int evaluate_channel_condition_for_client( |
798 | const struct lttng_condition *condition, | |
799 | struct notification_thread_state *state, | |
800 | struct lttng_evaluation **evaluation, | |
801 | uid_t *session_uid, gid_t *session_gid) | |
e4db5ace JR |
802 | { |
803 | int ret; | |
804 | struct cds_lfht_iter iter; | |
805 | struct cds_lfht_node *node; | |
806 | struct channel_info *channel_info = NULL; | |
807 | struct channel_key *channel_key = NULL; | |
808 | struct channel_state_sample *last_sample = NULL; | |
809 | struct lttng_channel_trigger_list *channel_trigger_list = NULL; | |
e4db5ace | 810 | |
1831ae68 FD |
811 | rcu_read_lock(); |
812 | ||
f82f93a1 | 813 | /* Find the channel associated with the condition. */ |
e4db5ace | 814 | cds_lfht_for_each_entry(state->channel_triggers_ht, &iter, |
f82f93a1 | 815 | channel_trigger_list, channel_triggers_ht_node) { |
e4db5ace JR |
816 | struct lttng_trigger_list_element *element; |
817 | ||
818 | cds_list_for_each_entry(element, &channel_trigger_list->list, node) { | |
9b63a4aa | 819 | const struct lttng_condition *current_condition = |
f82f93a1 | 820 | lttng_trigger_get_const_condition( |
e4db5ace JR |
821 | element->trigger); |
822 | ||
823 | assert(current_condition); | |
824 | if (!lttng_condition_is_equal(condition, | |
2ae99f0b | 825 | current_condition)) { |
e4db5ace JR |
826 | continue; |
827 | } | |
828 | ||
829 | /* Found the trigger, save the channel key. */ | |
830 | channel_key = &channel_trigger_list->channel_key; | |
831 | break; | |
832 | } | |
833 | if (channel_key) { | |
834 | /* The channel key was found stop iteration. */ | |
835 | break; | |
836 | } | |
837 | } | |
838 | ||
839 | if (!channel_key){ | |
840 | /* No channel found; normal exit. */ | |
f82f93a1 | 841 | DBG("[notification-thread] No known channel associated with newly subscribed-to condition"); |
e4db5ace JR |
842 | ret = 0; |
843 | goto end; | |
844 | } | |
845 | ||
846 | /* Fetch channel info for the matching channel. */ | |
847 | cds_lfht_lookup(state->channels_ht, | |
848 | hash_channel_key(channel_key), | |
849 | match_channel_info, | |
850 | channel_key, | |
851 | &iter); | |
852 | node = cds_lfht_iter_get_node(&iter); | |
853 | assert(node); | |
854 | channel_info = caa_container_of(node, struct channel_info, | |
855 | channels_ht_node); | |
856 | ||
857 | /* Retrieve the channel's last sample, if it exists. */ | |
858 | cds_lfht_lookup(state->channel_state_ht, | |
859 | hash_channel_key(channel_key), | |
860 | match_channel_state_sample, | |
861 | channel_key, | |
862 | &iter); | |
863 | node = cds_lfht_iter_get_node(&iter); | |
864 | if (node) { | |
865 | last_sample = caa_container_of(node, | |
866 | struct channel_state_sample, | |
867 | channel_state_ht_node); | |
868 | } else { | |
869 | /* Nothing to evaluate, no sample was ever taken. Normal exit */ | |
870 | DBG("[notification-thread] No channel sample associated with newly subscribed-to condition"); | |
871 | ret = 0; | |
872 | goto end; | |
873 | } | |
874 | ||
f82f93a1 | 875 | ret = evaluate_buffer_condition(condition, evaluation, state, |
e8360425 JD |
876 | NULL, last_sample, |
877 | 0, channel_info->session_info->consumed_data_size, | |
878 | channel_info); | |
e4db5ace | 879 | if (ret) { |
066a3c82 | 880 | WARN("[notification-thread] Fatal error occurred while evaluating a newly subscribed-to condition"); |
e4db5ace JR |
881 | goto end; |
882 | } | |
883 | ||
f82f93a1 JG |
884 | *session_uid = channel_info->session_info->uid; |
885 | *session_gid = channel_info->session_info->gid; | |
886 | end: | |
1831ae68 | 887 | rcu_read_unlock(); |
f82f93a1 JG |
888 | return ret; |
889 | } | |
890 | ||
891 | static | |
892 | const char *get_condition_session_name(const struct lttng_condition *condition) | |
893 | { | |
894 | const char *session_name = NULL; | |
895 | enum lttng_condition_status status; | |
896 | ||
897 | switch (lttng_condition_get_type(condition)) { | |
898 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
899 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
900 | status = lttng_condition_buffer_usage_get_session_name( | |
901 | condition, &session_name); | |
902 | break; | |
903 | case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE: | |
904 | status = lttng_condition_session_consumed_size_get_session_name( | |
905 | condition, &session_name); | |
906 | break; | |
907 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING: | |
908 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED: | |
909 | status = lttng_condition_session_rotation_get_session_name( | |
910 | condition, &session_name); | |
911 | break; | |
912 | default: | |
913 | abort(); | |
914 | } | |
915 | if (status != LTTNG_CONDITION_STATUS_OK) { | |
916 | ERR("[notification-thread] Failed to retrieve session rotation condition's session name"); | |
917 | goto end; | |
918 | } | |
919 | end: | |
920 | return session_name; | |
921 | } | |
922 | ||
f82f93a1 JG |
923 | static |
924 | int evaluate_session_condition_for_client( | |
925 | const struct lttng_condition *condition, | |
926 | struct notification_thread_state *state, | |
927 | struct lttng_evaluation **evaluation, | |
928 | uid_t *session_uid, gid_t *session_gid) | |
929 | { | |
930 | int ret; | |
931 | struct cds_lfht_iter iter; | |
932 | struct cds_lfht_node *node; | |
933 | const char *session_name; | |
934 | struct session_info *session_info = NULL; | |
935 | ||
1831ae68 | 936 | rcu_read_lock(); |
f82f93a1 JG |
937 | session_name = get_condition_session_name(condition); |
938 | ||
939 | /* Find the session associated with the trigger. */ | |
940 | cds_lfht_lookup(state->sessions_ht, | |
941 | hash_key_str(session_name, lttng_ht_seed), | |
942 | match_session, | |
943 | session_name, | |
944 | &iter); | |
945 | node = cds_lfht_iter_get_node(&iter); | |
946 | if (!node) { | |
947 | DBG("[notification-thread] No known session matching name \"%s\"", | |
948 | session_name); | |
949 | ret = 0; | |
950 | goto end; | |
951 | } | |
952 | ||
953 | session_info = caa_container_of(node, struct session_info, | |
954 | sessions_ht_node); | |
955 | session_info_get(session_info); | |
956 | ||
957 | /* | |
958 | * Evaluation is performed in-line here since only one type of | |
959 | * session-bound condition is handled for the moment. | |
960 | */ | |
961 | switch (lttng_condition_get_type(condition)) { | |
962 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING: | |
963 | if (!session_info->rotation.ongoing) { | |
be558f88 | 964 | ret = 0; |
f82f93a1 JG |
965 | goto end_session_put; |
966 | } | |
967 | ||
968 | *evaluation = lttng_evaluation_session_rotation_ongoing_create( | |
969 | session_info->rotation.id); | |
970 | if (!*evaluation) { | |
971 | /* Fatal error. */ | |
972 | ERR("[notification-thread] Failed to create session rotation ongoing evaluation for session \"%s\"", | |
973 | session_info->name); | |
974 | ret = -1; | |
975 | goto end_session_put; | |
976 | } | |
977 | ret = 0; | |
978 | break; | |
979 | default: | |
980 | ret = 0; | |
981 | goto end_session_put; | |
982 | } | |
983 | ||
984 | *session_uid = session_info->uid; | |
985 | *session_gid = session_info->gid; | |
986 | ||
987 | end_session_put: | |
988 | session_info_put(session_info); | |
989 | end: | |
1831ae68 | 990 | rcu_read_unlock(); |
f82f93a1 JG |
991 | return ret; |
992 | } | |
993 | ||
f82f93a1 JG |
994 | static |
995 | int evaluate_condition_for_client(const struct lttng_trigger *trigger, | |
996 | const struct lttng_condition *condition, | |
997 | struct notification_client *client, | |
998 | struct notification_thread_state *state) | |
999 | { | |
1000 | int ret; | |
1001 | struct lttng_evaluation *evaluation = NULL; | |
1831ae68 FD |
1002 | struct notification_client_list client_list = { |
1003 | .lock = PTHREAD_MUTEX_INITIALIZER, | |
1004 | }; | |
f82f93a1 JG |
1005 | struct notification_client_list_element client_list_element = { 0 }; |
1006 | uid_t object_uid = 0; | |
1007 | gid_t object_gid = 0; | |
1008 | ||
1009 | assert(trigger); | |
1010 | assert(condition); | |
1011 | assert(client); | |
1012 | assert(state); | |
1013 | ||
1014 | switch (get_condition_binding_object(condition)) { | |
1015 | case LTTNG_OBJECT_TYPE_SESSION: | |
1016 | ret = evaluate_session_condition_for_client(condition, state, | |
1017 | &evaluation, &object_uid, &object_gid); | |
1018 | break; | |
1019 | case LTTNG_OBJECT_TYPE_CHANNEL: | |
1020 | ret = evaluate_channel_condition_for_client(condition, state, | |
1021 | &evaluation, &object_uid, &object_gid); | |
1022 | break; | |
1023 | case LTTNG_OBJECT_TYPE_NONE: | |
1831ae68 | 1024 | DBG("[notification-thread] Newly subscribed-to condition not binded to object, nothing to evaluate"); |
f82f93a1 JG |
1025 | ret = 0; |
1026 | goto end; | |
1027 | case LTTNG_OBJECT_TYPE_UNKNOWN: | |
1028 | default: | |
1029 | ret = -1; | |
1030 | goto end; | |
1031 | } | |
af0c318d JG |
1032 | if (ret) { |
1033 | /* Fatal error. */ | |
1034 | goto end; | |
1035 | } | |
e4db5ace JR |
1036 | if (!evaluation) { |
1037 | /* Evaluation yielded nothing. Normal exit. */ | |
1038 | DBG("[notification-thread] Newly subscribed-to condition evaluated to false, nothing to report to client"); | |
1039 | ret = 0; | |
1040 | goto end; | |
1041 | } | |
1042 | ||
1043 | /* | |
1044 | * Create a temporary client list with the client currently | |
1045 | * subscribing. | |
1046 | */ | |
1831ae68 | 1047 | cds_lfht_node_init(&client_list.notification_trigger_clients_ht_node); |
e4db5ace JR |
1048 | CDS_INIT_LIST_HEAD(&client_list.list); |
1049 | client_list.trigger = trigger; | |
1050 | ||
1051 | CDS_INIT_LIST_HEAD(&client_list_element.node); | |
1052 | client_list_element.client = client; | |
1053 | cds_list_add(&client_list_element.node, &client_list.list); | |
1054 | ||
1055 | /* Send evaluation result to the newly-subscribed client. */ | |
1056 | DBG("[notification-thread] Newly subscribed-to condition evaluated to true, notifying client"); | |
1057 | ret = send_evaluation_to_clients(trigger, evaluation, &client_list, | |
f82f93a1 | 1058 | state, object_uid, object_gid); |
e4db5ace JR |
1059 | |
1060 | end: | |
1061 | return ret; | |
1062 | } | |
1063 | ||
ab0ee2ca JG |
1064 | static |
1065 | int notification_thread_client_subscribe(struct notification_client *client, | |
1066 | struct lttng_condition *condition, | |
1067 | struct notification_thread_state *state, | |
1068 | enum lttng_notification_channel_status *_status) | |
1069 | { | |
1070 | int ret = 0; | |
1831ae68 | 1071 | struct notification_client_list *client_list = NULL; |
ab0ee2ca JG |
1072 | struct lttng_condition_list_element *condition_list_element = NULL; |
1073 | struct notification_client_list_element *client_list_element = NULL; | |
1074 | enum lttng_notification_channel_status status = | |
1075 | LTTNG_NOTIFICATION_CHANNEL_STATUS_OK; | |
1076 | ||
1077 | /* | |
1078 | * Ensure that the client has not already subscribed to this condition | |
1079 | * before. | |
1080 | */ | |
1081 | cds_list_for_each_entry(condition_list_element, &client->condition_list, node) { | |
1082 | if (lttng_condition_is_equal(condition_list_element->condition, | |
1083 | condition)) { | |
1084 | status = LTTNG_NOTIFICATION_CHANNEL_STATUS_ALREADY_SUBSCRIBED; | |
1085 | goto end; | |
1086 | } | |
1087 | } | |
1088 | ||
1089 | condition_list_element = zmalloc(sizeof(*condition_list_element)); | |
1090 | if (!condition_list_element) { | |
1091 | ret = -1; | |
1092 | goto error; | |
1093 | } | |
1094 | client_list_element = zmalloc(sizeof(*client_list_element)); | |
1095 | if (!client_list_element) { | |
1096 | ret = -1; | |
1097 | goto error; | |
1098 | } | |
1099 | ||
ab0ee2ca JG |
1100 | /* |
1101 | * Add the newly-subscribed condition to the client's subscription list. | |
1102 | */ | |
1103 | CDS_INIT_LIST_HEAD(&condition_list_element->node); | |
1104 | condition_list_element->condition = condition; | |
1105 | cds_list_add(&condition_list_element->node, &client->condition_list); | |
1106 | ||
ed327204 JG |
1107 | client_list = get_client_list_from_condition(state, condition); |
1108 | if (!client_list) { | |
2ae99f0b JG |
1109 | /* |
1110 | * No notification-emiting trigger registered with this | |
1111 | * condition. We don't evaluate the condition right away | |
1112 | * since this trigger is not registered yet. | |
1113 | */ | |
4fb43b68 | 1114 | free(client_list_element); |
1831ae68 | 1115 | goto end; |
ab0ee2ca JG |
1116 | } |
1117 | ||
2ae99f0b JG |
1118 | /* |
1119 | * The condition to which the client just subscribed is evaluated | |
1120 | * at this point so that conditions that are already TRUE result | |
1121 | * in a notification being sent out. | |
1831ae68 FD |
1122 | * |
1123 | * The client_list's trigger is used without locking the list itself. | |
1124 | * This is correct since the list doesn't own the trigger and the | |
1125 | * object is immutable. | |
2ae99f0b | 1126 | */ |
e4db5ace JR |
1127 | if (evaluate_condition_for_client(client_list->trigger, condition, |
1128 | client, state)) { | |
1129 | WARN("[notification-thread] Evaluation of a condition on client subscription failed, aborting."); | |
1130 | ret = -1; | |
4bd5b4af | 1131 | free(client_list_element); |
1831ae68 | 1132 | goto end; |
e4db5ace JR |
1133 | } |
1134 | ||
1135 | /* | |
1136 | * Add the client to the list of clients interested in a given trigger | |
1137 | * if a "notification" trigger with a corresponding condition was | |
1138 | * added prior. | |
1139 | */ | |
ab0ee2ca JG |
1140 | client_list_element->client = client; |
1141 | CDS_INIT_LIST_HEAD(&client_list_element->node); | |
1831ae68 FD |
1142 | |
1143 | pthread_mutex_lock(&client_list->lock); | |
ab0ee2ca | 1144 | cds_list_add(&client_list_element->node, &client_list->list); |
1831ae68 | 1145 | pthread_mutex_unlock(&client_list->lock); |
ab0ee2ca JG |
1146 | end: |
1147 | if (_status) { | |
1148 | *_status = status; | |
1149 | } | |
1831ae68 FD |
1150 | if (client_list) { |
1151 | notification_client_list_put(client_list); | |
1152 | } | |
ab0ee2ca JG |
1153 | return ret; |
1154 | error: | |
1155 | free(condition_list_element); | |
1156 | free(client_list_element); | |
1157 | return ret; | |
1158 | } | |
1159 | ||
1160 | static | |
1161 | int notification_thread_client_unsubscribe( | |
1162 | struct notification_client *client, | |
1163 | struct lttng_condition *condition, | |
1164 | struct notification_thread_state *state, | |
1165 | enum lttng_notification_channel_status *_status) | |
1166 | { | |
ab0ee2ca JG |
1167 | struct notification_client_list *client_list; |
1168 | struct lttng_condition_list_element *condition_list_element, | |
1169 | *condition_tmp; | |
1170 | struct notification_client_list_element *client_list_element, | |
1171 | *client_tmp; | |
1172 | bool condition_found = false; | |
1173 | enum lttng_notification_channel_status status = | |
1174 | LTTNG_NOTIFICATION_CHANNEL_STATUS_OK; | |
1175 | ||
1176 | /* Remove the condition from the client's condition list. */ | |
1177 | cds_list_for_each_entry_safe(condition_list_element, condition_tmp, | |
1178 | &client->condition_list, node) { | |
1179 | if (!lttng_condition_is_equal(condition_list_element->condition, | |
1180 | condition)) { | |
1181 | continue; | |
1182 | } | |
1183 | ||
1184 | cds_list_del(&condition_list_element->node); | |
1185 | /* | |
1186 | * The caller may be iterating on the client's conditions to | |
1187 | * tear down a client's connection. In this case, the condition | |
1188 | * will be destroyed at the end. | |
1189 | */ | |
1190 | if (condition != condition_list_element->condition) { | |
1191 | lttng_condition_destroy( | |
1192 | condition_list_element->condition); | |
1193 | } | |
1194 | free(condition_list_element); | |
1195 | condition_found = true; | |
1196 | break; | |
1197 | } | |
1198 | ||
1199 | if (!condition_found) { | |
1200 | status = LTTNG_NOTIFICATION_CHANNEL_STATUS_UNKNOWN_CONDITION; | |
1201 | goto end; | |
1202 | } | |
1203 | ||
1204 | /* | |
1205 | * Remove the client from the list of clients interested the trigger | |
1206 | * matching the condition. | |
1207 | */ | |
ed327204 JG |
1208 | client_list = get_client_list_from_condition(state, condition); |
1209 | if (!client_list) { | |
1831ae68 | 1210 | goto end; |
ab0ee2ca JG |
1211 | } |
1212 | ||
1831ae68 | 1213 | pthread_mutex_lock(&client_list->lock); |
ab0ee2ca JG |
1214 | cds_list_for_each_entry_safe(client_list_element, client_tmp, |
1215 | &client_list->list, node) { | |
1831ae68 | 1216 | if (client_list_element->client->id != client->id) { |
ab0ee2ca JG |
1217 | continue; |
1218 | } | |
1219 | cds_list_del(&client_list_element->node); | |
1220 | free(client_list_element); | |
1221 | break; | |
1222 | } | |
1831ae68 FD |
1223 | pthread_mutex_unlock(&client_list->lock); |
1224 | notification_client_list_put(client_list); | |
1225 | client_list = NULL; | |
ab0ee2ca JG |
1226 | end: |
1227 | lttng_condition_destroy(condition); | |
1228 | if (_status) { | |
1229 | *_status = status; | |
1230 | } | |
1231 | return 0; | |
1232 | } | |
1233 | ||
83b934ad MD |
1234 | static |
1235 | void free_notification_client_rcu(struct rcu_head *node) | |
1236 | { | |
1237 | free(caa_container_of(node, struct notification_client, rcu_node)); | |
1238 | } | |
1239 | ||
ab0ee2ca JG |
1240 | static |
1241 | void notification_client_destroy(struct notification_client *client, | |
1242 | struct notification_thread_state *state) | |
1243 | { | |
ab0ee2ca JG |
1244 | if (!client) { |
1245 | return; | |
1246 | } | |
1247 | ||
1831ae68 FD |
1248 | /* |
1249 | * The client object is not reachable by other threads, no need to lock | |
1250 | * the client here. | |
1251 | */ | |
ab0ee2ca JG |
1252 | if (client->socket >= 0) { |
1253 | (void) lttcomm_close_unix_sock(client->socket); | |
1831ae68 | 1254 | client->socket = -1; |
ab0ee2ca | 1255 | } |
1831ae68 | 1256 | client->communication.active = false; |
ab0ee2ca JG |
1257 | lttng_dynamic_buffer_reset(&client->communication.inbound.buffer); |
1258 | lttng_dynamic_buffer_reset(&client->communication.outbound.buffer); | |
1831ae68 | 1259 | pthread_mutex_destroy(&client->lock); |
83b934ad | 1260 | call_rcu(&client->rcu_node, free_notification_client_rcu); |
ab0ee2ca JG |
1261 | } |
1262 | ||
1263 | /* | |
1264 | * Call with rcu_read_lock held (and hold for the lifetime of the returned | |
1265 | * client pointer). | |
1266 | */ | |
1267 | static | |
1268 | struct notification_client *get_client_from_socket(int socket, | |
1269 | struct notification_thread_state *state) | |
1270 | { | |
1271 | struct cds_lfht_iter iter; | |
1272 | struct cds_lfht_node *node; | |
1273 | struct notification_client *client = NULL; | |
1274 | ||
1275 | cds_lfht_lookup(state->client_socket_ht, | |
1831ae68 FD |
1276 | hash_client_socket(socket), |
1277 | match_client_socket, | |
ab0ee2ca JG |
1278 | (void *) (unsigned long) socket, |
1279 | &iter); | |
1280 | node = cds_lfht_iter_get_node(&iter); | |
1281 | if (!node) { | |
1282 | goto end; | |
1283 | } | |
1284 | ||
1285 | client = caa_container_of(node, struct notification_client, | |
1286 | client_socket_ht_node); | |
1287 | end: | |
1288 | return client; | |
1289 | } | |
1290 | ||
1831ae68 FD |
1291 | /* |
1292 | * Call with rcu_read_lock held (and hold for the lifetime of the returned | |
1293 | * client pointer). | |
1294 | */ | |
1295 | static | |
1296 | struct notification_client *get_client_from_id(notification_client_id id, | |
1297 | struct notification_thread_state *state) | |
1298 | { | |
1299 | struct cds_lfht_iter iter; | |
1300 | struct cds_lfht_node *node; | |
1301 | struct notification_client *client = NULL; | |
1302 | ||
1303 | cds_lfht_lookup(state->client_id_ht, | |
1304 | hash_client_id(id), | |
1305 | match_client_id, | |
1306 | &id, | |
1307 | &iter); | |
1308 | node = cds_lfht_iter_get_node(&iter); | |
1309 | if (!node) { | |
1310 | goto end; | |
1311 | } | |
1312 | ||
1313 | client = caa_container_of(node, struct notification_client, | |
1314 | client_id_ht_node); | |
1315 | end: | |
1316 | return client; | |
1317 | } | |
1318 | ||
ab0ee2ca | 1319 | static |
e8360425 | 1320 | bool buffer_usage_condition_applies_to_channel( |
51eab943 JG |
1321 | const struct lttng_condition *condition, |
1322 | const struct channel_info *channel_info) | |
ab0ee2ca JG |
1323 | { |
1324 | enum lttng_condition_status status; | |
e8360425 JD |
1325 | enum lttng_domain_type condition_domain; |
1326 | const char *condition_session_name = NULL; | |
1327 | const char *condition_channel_name = NULL; | |
ab0ee2ca | 1328 | |
e8360425 JD |
1329 | status = lttng_condition_buffer_usage_get_domain_type(condition, |
1330 | &condition_domain); | |
1331 | assert(status == LTTNG_CONDITION_STATUS_OK); | |
1332 | if (channel_info->key.domain != condition_domain) { | |
ab0ee2ca JG |
1333 | goto fail; |
1334 | } | |
1335 | ||
e8360425 JD |
1336 | status = lttng_condition_buffer_usage_get_session_name( |
1337 | condition, &condition_session_name); | |
1338 | assert((status == LTTNG_CONDITION_STATUS_OK) && condition_session_name); | |
1339 | ||
1340 | status = lttng_condition_buffer_usage_get_channel_name( | |
1341 | condition, &condition_channel_name); | |
1342 | assert((status == LTTNG_CONDITION_STATUS_OK) && condition_channel_name); | |
1343 | ||
1344 | if (strcmp(channel_info->session_info->name, condition_session_name)) { | |
1345 | goto fail; | |
1346 | } | |
1347 | if (strcmp(channel_info->name, condition_channel_name)) { | |
ab0ee2ca JG |
1348 | goto fail; |
1349 | } | |
1350 | ||
e8360425 JD |
1351 | return true; |
1352 | fail: | |
1353 | return false; | |
1354 | } | |
1355 | ||
1356 | static | |
1357 | bool session_consumed_size_condition_applies_to_channel( | |
51eab943 JG |
1358 | const struct lttng_condition *condition, |
1359 | const struct channel_info *channel_info) | |
e8360425 JD |
1360 | { |
1361 | enum lttng_condition_status status; | |
1362 | const char *condition_session_name = NULL; | |
1363 | ||
1364 | status = lttng_condition_session_consumed_size_get_session_name( | |
1365 | condition, &condition_session_name); | |
1366 | assert((status == LTTNG_CONDITION_STATUS_OK) && condition_session_name); | |
1367 | ||
1368 | if (strcmp(channel_info->session_info->name, condition_session_name)) { | |
ab0ee2ca JG |
1369 | goto fail; |
1370 | } | |
1371 | ||
e8360425 JD |
1372 | return true; |
1373 | fail: | |
1374 | return false; | |
1375 | } | |
ab0ee2ca | 1376 | |
51eab943 JG |
1377 | static |
1378 | bool trigger_applies_to_channel(const struct lttng_trigger *trigger, | |
1379 | const struct channel_info *channel_info) | |
1380 | { | |
1381 | const struct lttng_condition *condition; | |
e8360425 | 1382 | bool trigger_applies; |
ab0ee2ca | 1383 | |
51eab943 | 1384 | condition = lttng_trigger_get_const_condition(trigger); |
e8360425 | 1385 | if (!condition) { |
ab0ee2ca JG |
1386 | goto fail; |
1387 | } | |
e8360425 JD |
1388 | |
1389 | switch (lttng_condition_get_type(condition)) { | |
1390 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
1391 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
1392 | trigger_applies = buffer_usage_condition_applies_to_channel( | |
1393 | condition, channel_info); | |
1394 | break; | |
1395 | case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE: | |
1396 | trigger_applies = session_consumed_size_condition_applies_to_channel( | |
1397 | condition, channel_info); | |
1398 | break; | |
1399 | default: | |
ab0ee2ca JG |
1400 | goto fail; |
1401 | } | |
1402 | ||
e8360425 | 1403 | return trigger_applies; |
ab0ee2ca JG |
1404 | fail: |
1405 | return false; | |
1406 | } | |
1407 | ||
1408 | static | |
1409 | bool trigger_applies_to_client(struct lttng_trigger *trigger, | |
1410 | struct notification_client *client) | |
1411 | { | |
1412 | bool applies = false; | |
1413 | struct lttng_condition_list_element *condition_list_element; | |
1414 | ||
1415 | cds_list_for_each_entry(condition_list_element, &client->condition_list, | |
1416 | node) { | |
1417 | applies = lttng_condition_is_equal( | |
1418 | condition_list_element->condition, | |
1419 | lttng_trigger_get_condition(trigger)); | |
1420 | if (applies) { | |
1421 | break; | |
1422 | } | |
1423 | } | |
1424 | return applies; | |
1425 | } | |
1426 | ||
ed327204 JG |
1427 | /* Must be called with RCU read lock held. */ |
1428 | static | |
1429 | struct lttng_session_trigger_list *get_session_trigger_list( | |
1430 | struct notification_thread_state *state, | |
1431 | const char *session_name) | |
1432 | { | |
1433 | struct lttng_session_trigger_list *list = NULL; | |
1434 | struct cds_lfht_node *node; | |
1435 | struct cds_lfht_iter iter; | |
1436 | ||
1437 | cds_lfht_lookup(state->session_triggers_ht, | |
1438 | hash_key_str(session_name, lttng_ht_seed), | |
1439 | match_session_trigger_list, | |
1440 | session_name, | |
1441 | &iter); | |
1442 | node = cds_lfht_iter_get_node(&iter); | |
1443 | if (!node) { | |
1444 | /* | |
1445 | * Not an error, the list of triggers applying to that session | |
1446 | * will be initialized when the session is created. | |
1447 | */ | |
1448 | DBG("[notification-thread] No trigger list found for session \"%s\" as it is not yet known to the notification system", | |
1449 | session_name); | |
1450 | goto end; | |
1451 | } | |
1452 | ||
1453 | list = caa_container_of(node, | |
1454 | struct lttng_session_trigger_list, | |
1455 | session_triggers_ht_node); | |
1456 | end: | |
1457 | return list; | |
1458 | } | |
1459 | ||
ea9a44f0 JG |
1460 | /* |
1461 | * Allocate an empty lttng_session_trigger_list for the session named | |
1462 | * 'session_name'. | |
1463 | * | |
1464 | * No ownership of 'session_name' is assumed by the session trigger list. | |
1465 | * It is the caller's responsability to ensure the session name is alive | |
1466 | * for as long as this list is. | |
1467 | */ | |
1468 | static | |
1469 | struct lttng_session_trigger_list *lttng_session_trigger_list_create( | |
1470 | const char *session_name, | |
1471 | struct cds_lfht *session_triggers_ht) | |
1472 | { | |
1473 | struct lttng_session_trigger_list *list; | |
1474 | ||
1475 | list = zmalloc(sizeof(*list)); | |
1476 | if (!list) { | |
1477 | goto end; | |
1478 | } | |
1479 | list->session_name = session_name; | |
1480 | CDS_INIT_LIST_HEAD(&list->list); | |
1481 | cds_lfht_node_init(&list->session_triggers_ht_node); | |
1482 | list->session_triggers_ht = session_triggers_ht; | |
1483 | ||
1484 | rcu_read_lock(); | |
1485 | /* Publish the list through the session_triggers_ht. */ | |
1486 | cds_lfht_add(session_triggers_ht, | |
1487 | hash_key_str(session_name, lttng_ht_seed), | |
1488 | &list->session_triggers_ht_node); | |
1489 | rcu_read_unlock(); | |
1490 | end: | |
1491 | return list; | |
1492 | } | |
1493 | ||
1494 | static | |
1495 | void free_session_trigger_list_rcu(struct rcu_head *node) | |
1496 | { | |
1497 | free(caa_container_of(node, struct lttng_session_trigger_list, | |
1498 | rcu_node)); | |
1499 | } | |
1500 | ||
1501 | static | |
1502 | void lttng_session_trigger_list_destroy(struct lttng_session_trigger_list *list) | |
1503 | { | |
1504 | struct lttng_trigger_list_element *trigger_list_element, *tmp; | |
1505 | ||
1506 | /* Empty the list element by element, and then free the list itself. */ | |
1507 | cds_list_for_each_entry_safe(trigger_list_element, tmp, | |
1508 | &list->list, node) { | |
1509 | cds_list_del(&trigger_list_element->node); | |
1510 | free(trigger_list_element); | |
1511 | } | |
1512 | rcu_read_lock(); | |
1513 | /* Unpublish the list from the session_triggers_ht. */ | |
1514 | cds_lfht_del(list->session_triggers_ht, | |
1515 | &list->session_triggers_ht_node); | |
1516 | rcu_read_unlock(); | |
1517 | call_rcu(&list->rcu_node, free_session_trigger_list_rcu); | |
1518 | } | |
1519 | ||
1520 | static | |
1521 | int lttng_session_trigger_list_add(struct lttng_session_trigger_list *list, | |
1831ae68 | 1522 | struct lttng_trigger *trigger) |
ea9a44f0 JG |
1523 | { |
1524 | int ret = 0; | |
1525 | struct lttng_trigger_list_element *new_element = | |
1526 | zmalloc(sizeof(*new_element)); | |
1527 | ||
1528 | if (!new_element) { | |
1529 | ret = -1; | |
1530 | goto end; | |
1531 | } | |
1532 | CDS_INIT_LIST_HEAD(&new_element->node); | |
1533 | new_element->trigger = trigger; | |
1534 | cds_list_add(&new_element->node, &list->list); | |
1535 | end: | |
1536 | return ret; | |
1537 | } | |
1538 | ||
1539 | static | |
1540 | bool trigger_applies_to_session(const struct lttng_trigger *trigger, | |
1541 | const char *session_name) | |
1542 | { | |
1543 | bool applies = false; | |
1544 | const struct lttng_condition *condition; | |
1545 | ||
1546 | condition = lttng_trigger_get_const_condition(trigger); | |
1547 | switch (lttng_condition_get_type(condition)) { | |
1548 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING: | |
1549 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED: | |
1550 | { | |
1551 | enum lttng_condition_status condition_status; | |
1552 | const char *condition_session_name; | |
1553 | ||
1554 | condition_status = lttng_condition_session_rotation_get_session_name( | |
1555 | condition, &condition_session_name); | |
1556 | if (condition_status != LTTNG_CONDITION_STATUS_OK) { | |
1557 | ERR("[notification-thread] Failed to retrieve session rotation condition's session name"); | |
1558 | goto end; | |
1559 | } | |
1560 | ||
1561 | assert(condition_session_name); | |
1562 | applies = !strcmp(condition_session_name, session_name); | |
1563 | break; | |
1564 | } | |
1565 | default: | |
1566 | goto end; | |
1567 | } | |
1568 | end: | |
1569 | return applies; | |
1570 | } | |
1571 | ||
1572 | /* | |
1573 | * Allocate and initialize an lttng_session_trigger_list which contains | |
1574 | * all triggers that apply to the session named 'session_name'. | |
1575 | * | |
1576 | * No ownership of 'session_name' is assumed by the session trigger list. | |
1577 | * It is the caller's responsability to ensure the session name is alive | |
1578 | * for as long as this list is. | |
1579 | */ | |
1580 | static | |
1581 | struct lttng_session_trigger_list *lttng_session_trigger_list_build( | |
1582 | const struct notification_thread_state *state, | |
1583 | const char *session_name) | |
1584 | { | |
1585 | int trigger_count = 0; | |
1586 | struct lttng_session_trigger_list *session_trigger_list = NULL; | |
1587 | struct lttng_trigger_ht_element *trigger_ht_element = NULL; | |
1588 | struct cds_lfht_iter iter; | |
1589 | ||
1590 | session_trigger_list = lttng_session_trigger_list_create(session_name, | |
1591 | state->session_triggers_ht); | |
1592 | ||
1593 | /* Add all triggers applying to the session named 'session_name'. */ | |
1594 | cds_lfht_for_each_entry(state->triggers_ht, &iter, trigger_ht_element, | |
1595 | node) { | |
1596 | int ret; | |
1597 | ||
1598 | if (!trigger_applies_to_session(trigger_ht_element->trigger, | |
1599 | session_name)) { | |
1600 | continue; | |
1601 | } | |
1602 | ||
1603 | ret = lttng_session_trigger_list_add(session_trigger_list, | |
1604 | trigger_ht_element->trigger); | |
1605 | if (ret) { | |
1606 | goto error; | |
1607 | } | |
1608 | ||
1609 | trigger_count++; | |
1610 | } | |
1611 | ||
1612 | DBG("[notification-thread] Found %i triggers that apply to newly created session", | |
1613 | trigger_count); | |
1614 | return session_trigger_list; | |
1615 | error: | |
1616 | lttng_session_trigger_list_destroy(session_trigger_list); | |
1617 | return NULL; | |
1618 | } | |
1619 | ||
8abe313a JG |
1620 | static |
1621 | struct session_info *find_or_create_session_info( | |
1622 | struct notification_thread_state *state, | |
1623 | const char *name, uid_t uid, gid_t gid) | |
1624 | { | |
1625 | struct session_info *session = NULL; | |
1626 | struct cds_lfht_node *node; | |
1627 | struct cds_lfht_iter iter; | |
ea9a44f0 | 1628 | struct lttng_session_trigger_list *trigger_list; |
8abe313a JG |
1629 | |
1630 | rcu_read_lock(); | |
1631 | cds_lfht_lookup(state->sessions_ht, | |
1632 | hash_key_str(name, lttng_ht_seed), | |
1633 | match_session, | |
1634 | name, | |
1635 | &iter); | |
1636 | node = cds_lfht_iter_get_node(&iter); | |
1637 | if (node) { | |
1638 | DBG("[notification-thread] Found session info of session \"%s\" (uid = %i, gid = %i)", | |
1639 | name, uid, gid); | |
1640 | session = caa_container_of(node, struct session_info, | |
1641 | sessions_ht_node); | |
1642 | assert(session->uid == uid); | |
1643 | assert(session->gid == gid); | |
1eee26c5 JG |
1644 | session_info_get(session); |
1645 | goto end; | |
ea9a44f0 JG |
1646 | } |
1647 | ||
1648 | trigger_list = lttng_session_trigger_list_build(state, name); | |
1649 | if (!trigger_list) { | |
1650 | goto error; | |
8abe313a JG |
1651 | } |
1652 | ||
1eee26c5 JG |
1653 | session = session_info_create(name, uid, gid, trigger_list, |
1654 | state->sessions_ht); | |
8abe313a JG |
1655 | if (!session) { |
1656 | ERR("[notification-thread] Failed to allocation session info for session \"%s\" (uid = %i, gid = %i)", | |
1657 | name, uid, gid); | |
b248644d | 1658 | lttng_session_trigger_list_destroy(trigger_list); |
ea9a44f0 | 1659 | goto error; |
8abe313a | 1660 | } |
ea9a44f0 | 1661 | trigger_list = NULL; |
577983cb JG |
1662 | |
1663 | cds_lfht_add(state->sessions_ht, hash_key_str(name, lttng_ht_seed), | |
9b63a4aa | 1664 | &session->sessions_ht_node); |
1eee26c5 | 1665 | end: |
8abe313a JG |
1666 | rcu_read_unlock(); |
1667 | return session; | |
ea9a44f0 JG |
1668 | error: |
1669 | rcu_read_unlock(); | |
1670 | session_info_put(session); | |
1671 | return NULL; | |
8abe313a JG |
1672 | } |
1673 | ||
ab0ee2ca JG |
1674 | static |
1675 | int handle_notification_thread_command_add_channel( | |
8abe313a JG |
1676 | struct notification_thread_state *state, |
1677 | const char *session_name, uid_t session_uid, gid_t session_gid, | |
1678 | const char *channel_name, enum lttng_domain_type channel_domain, | |
1679 | uint64_t channel_key_int, uint64_t channel_capacity, | |
1680 | enum lttng_error_code *cmd_result) | |
ab0ee2ca JG |
1681 | { |
1682 | struct cds_list_head trigger_list; | |
8abe313a JG |
1683 | struct channel_info *new_channel_info = NULL; |
1684 | struct channel_key channel_key = { | |
1685 | .key = channel_key_int, | |
1686 | .domain = channel_domain, | |
1687 | }; | |
ab0ee2ca JG |
1688 | struct lttng_channel_trigger_list *channel_trigger_list = NULL; |
1689 | struct lttng_trigger_ht_element *trigger_ht_element = NULL; | |
1690 | int trigger_count = 0; | |
1691 | struct cds_lfht_iter iter; | |
8abe313a | 1692 | struct session_info *session_info = NULL; |
ab0ee2ca JG |
1693 | |
1694 | DBG("[notification-thread] Adding channel %s from session %s, channel key = %" PRIu64 " in %s domain", | |
8abe313a JG |
1695 | channel_name, session_name, channel_key_int, |
1696 | channel_domain == LTTNG_DOMAIN_KERNEL ? "kernel" : "user space"); | |
ab0ee2ca JG |
1697 | |
1698 | CDS_INIT_LIST_HEAD(&trigger_list); | |
1699 | ||
8abe313a JG |
1700 | session_info = find_or_create_session_info(state, session_name, |
1701 | session_uid, session_gid); | |
1702 | if (!session_info) { | |
a9577b76 | 1703 | /* Allocation error or an internal error occurred. */ |
ab0ee2ca JG |
1704 | goto error; |
1705 | } | |
1706 | ||
8abe313a JG |
1707 | new_channel_info = channel_info_create(channel_name, &channel_key, |
1708 | channel_capacity, session_info); | |
1709 | if (!new_channel_info) { | |
1710 | goto error; | |
1711 | } | |
ab0ee2ca | 1712 | |
83b934ad | 1713 | rcu_read_lock(); |
ab0ee2ca JG |
1714 | /* Build a list of all triggers applying to the new channel. */ |
1715 | cds_lfht_for_each_entry(state->triggers_ht, &iter, trigger_ht_element, | |
1716 | node) { | |
1717 | struct lttng_trigger_list_element *new_element; | |
1718 | ||
1719 | if (!trigger_applies_to_channel(trigger_ht_element->trigger, | |
8abe313a | 1720 | new_channel_info)) { |
ab0ee2ca JG |
1721 | continue; |
1722 | } | |
1723 | ||
1724 | new_element = zmalloc(sizeof(*new_element)); | |
1725 | if (!new_element) { | |
83b934ad | 1726 | rcu_read_unlock(); |
ab0ee2ca JG |
1727 | goto error; |
1728 | } | |
1729 | CDS_INIT_LIST_HEAD(&new_element->node); | |
1730 | new_element->trigger = trigger_ht_element->trigger; | |
1731 | cds_list_add(&new_element->node, &trigger_list); | |
1732 | trigger_count++; | |
1733 | } | |
83b934ad | 1734 | rcu_read_unlock(); |
ab0ee2ca JG |
1735 | |
1736 | DBG("[notification-thread] Found %i triggers that apply to newly added channel", | |
1737 | trigger_count); | |
1738 | channel_trigger_list = zmalloc(sizeof(*channel_trigger_list)); | |
1739 | if (!channel_trigger_list) { | |
1740 | goto error; | |
1741 | } | |
8abe313a | 1742 | channel_trigger_list->channel_key = new_channel_info->key; |
ab0ee2ca JG |
1743 | CDS_INIT_LIST_HEAD(&channel_trigger_list->list); |
1744 | cds_lfht_node_init(&channel_trigger_list->channel_triggers_ht_node); | |
1745 | cds_list_splice(&trigger_list, &channel_trigger_list->list); | |
1746 | ||
1747 | rcu_read_lock(); | |
1748 | /* Add channel to the channel_ht which owns the channel_infos. */ | |
1749 | cds_lfht_add(state->channels_ht, | |
8abe313a | 1750 | hash_channel_key(&new_channel_info->key), |
ab0ee2ca JG |
1751 | &new_channel_info->channels_ht_node); |
1752 | /* | |
1753 | * Add the list of triggers associated with this channel to the | |
1754 | * channel_triggers_ht. | |
1755 | */ | |
1756 | cds_lfht_add(state->channel_triggers_ht, | |
8abe313a | 1757 | hash_channel_key(&new_channel_info->key), |
ab0ee2ca JG |
1758 | &channel_trigger_list->channel_triggers_ht_node); |
1759 | rcu_read_unlock(); | |
1eee26c5 | 1760 | session_info_put(session_info); |
ab0ee2ca JG |
1761 | *cmd_result = LTTNG_OK; |
1762 | return 0; | |
1763 | error: | |
ab0ee2ca | 1764 | channel_info_destroy(new_channel_info); |
8abe313a | 1765 | session_info_put(session_info); |
ab0ee2ca JG |
1766 | return 1; |
1767 | } | |
1768 | ||
83b934ad MD |
1769 | static |
1770 | void free_channel_trigger_list_rcu(struct rcu_head *node) | |
1771 | { | |
1772 | free(caa_container_of(node, struct lttng_channel_trigger_list, | |
1773 | rcu_node)); | |
1774 | } | |
1775 | ||
1776 | static | |
1777 | void free_channel_state_sample_rcu(struct rcu_head *node) | |
1778 | { | |
1779 | free(caa_container_of(node, struct channel_state_sample, | |
1780 | rcu_node)); | |
1781 | } | |
1782 | ||
ab0ee2ca JG |
1783 | static |
1784 | int handle_notification_thread_command_remove_channel( | |
1785 | struct notification_thread_state *state, | |
1786 | uint64_t channel_key, enum lttng_domain_type domain, | |
1787 | enum lttng_error_code *cmd_result) | |
1788 | { | |
1789 | struct cds_lfht_node *node; | |
1790 | struct cds_lfht_iter iter; | |
1791 | struct lttng_channel_trigger_list *trigger_list; | |
1792 | struct lttng_trigger_list_element *trigger_list_element, *tmp; | |
1793 | struct channel_key key = { .key = channel_key, .domain = domain }; | |
1794 | struct channel_info *channel_info; | |
1795 | ||
1796 | DBG("[notification-thread] Removing channel key = %" PRIu64 " in %s domain", | |
1797 | channel_key, domain == LTTNG_DOMAIN_KERNEL ? "kernel" : "user space"); | |
1798 | ||
1799 | rcu_read_lock(); | |
1800 | ||
1801 | cds_lfht_lookup(state->channel_triggers_ht, | |
1802 | hash_channel_key(&key), | |
1803 | match_channel_trigger_list, | |
1804 | &key, | |
1805 | &iter); | |
1806 | node = cds_lfht_iter_get_node(&iter); | |
1807 | /* | |
1808 | * There is a severe internal error if we are being asked to remove a | |
1809 | * channel that doesn't exist. | |
1810 | */ | |
1811 | if (!node) { | |
1812 | ERR("[notification-thread] Channel being removed is unknown to the notification thread"); | |
1813 | goto end; | |
1814 | } | |
1815 | ||
1816 | /* Free the list of triggers associated with this channel. */ | |
1817 | trigger_list = caa_container_of(node, struct lttng_channel_trigger_list, | |
1818 | channel_triggers_ht_node); | |
1819 | cds_list_for_each_entry_safe(trigger_list_element, tmp, | |
1820 | &trigger_list->list, node) { | |
1821 | cds_list_del(&trigger_list_element->node); | |
1822 | free(trigger_list_element); | |
1823 | } | |
1824 | cds_lfht_del(state->channel_triggers_ht, node); | |
83b934ad | 1825 | call_rcu(&trigger_list->rcu_node, free_channel_trigger_list_rcu); |
ab0ee2ca JG |
1826 | |
1827 | /* Free sampled channel state. */ | |
1828 | cds_lfht_lookup(state->channel_state_ht, | |
1829 | hash_channel_key(&key), | |
1830 | match_channel_state_sample, | |
1831 | &key, | |
1832 | &iter); | |
1833 | node = cds_lfht_iter_get_node(&iter); | |
1834 | /* | |
1835 | * This is expected to be NULL if the channel is destroyed before we | |
1836 | * received a sample. | |
1837 | */ | |
1838 | if (node) { | |
1839 | struct channel_state_sample *sample = caa_container_of(node, | |
1840 | struct channel_state_sample, | |
1841 | channel_state_ht_node); | |
1842 | ||
1843 | cds_lfht_del(state->channel_state_ht, node); | |
83b934ad | 1844 | call_rcu(&sample->rcu_node, free_channel_state_sample_rcu); |
ab0ee2ca JG |
1845 | } |
1846 | ||
1847 | /* Remove the channel from the channels_ht and free it. */ | |
1848 | cds_lfht_lookup(state->channels_ht, | |
1849 | hash_channel_key(&key), | |
1850 | match_channel_info, | |
1851 | &key, | |
1852 | &iter); | |
1853 | node = cds_lfht_iter_get_node(&iter); | |
1854 | assert(node); | |
1855 | channel_info = caa_container_of(node, struct channel_info, | |
1856 | channels_ht_node); | |
1857 | cds_lfht_del(state->channels_ht, node); | |
1858 | channel_info_destroy(channel_info); | |
1859 | end: | |
1860 | rcu_read_unlock(); | |
1861 | *cmd_result = LTTNG_OK; | |
1862 | return 0; | |
1863 | } | |
1864 | ||
0ca52944 | 1865 | static |
ed327204 | 1866 | int handle_notification_thread_command_session_rotation( |
0ca52944 | 1867 | struct notification_thread_state *state, |
ed327204 JG |
1868 | enum notification_thread_command_type cmd_type, |
1869 | const char *session_name, uid_t session_uid, gid_t session_gid, | |
1870 | uint64_t trace_archive_chunk_id, | |
1871 | struct lttng_trace_archive_location *location, | |
1872 | enum lttng_error_code *_cmd_result) | |
0ca52944 | 1873 | { |
ed327204 JG |
1874 | int ret = 0; |
1875 | enum lttng_error_code cmd_result = LTTNG_OK; | |
1876 | struct lttng_session_trigger_list *trigger_list; | |
1877 | struct lttng_trigger_list_element *trigger_list_element; | |
1878 | struct session_info *session_info; | |
0ca52944 | 1879 | |
ed327204 JG |
1880 | rcu_read_lock(); |
1881 | ||
1882 | session_info = find_or_create_session_info(state, session_name, | |
1883 | session_uid, session_gid); | |
1884 | if (!session_info) { | |
a9577b76 | 1885 | /* Allocation error or an internal error occurred. */ |
ed327204 JG |
1886 | ret = -1; |
1887 | cmd_result = LTTNG_ERR_NOMEM; | |
1888 | goto end; | |
1889 | } | |
1890 | ||
1891 | session_info->rotation.ongoing = | |
1892 | cmd_type == NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_ONGOING; | |
1893 | session_info->rotation.id = trace_archive_chunk_id; | |
1894 | trigger_list = get_session_trigger_list(state, session_name); | |
1895 | if (!trigger_list) { | |
1896 | DBG("[notification-thread] No triggers applying to session \"%s\" found", | |
1897 | session_name); | |
1898 | goto end; | |
1899 | } | |
1900 | ||
1901 | cds_list_for_each_entry(trigger_list_element, &trigger_list->list, | |
1902 | node) { | |
1903 | const struct lttng_condition *condition; | |
1904 | const struct lttng_action *action; | |
1905 | const struct lttng_trigger *trigger; | |
1906 | struct notification_client_list *client_list; | |
1907 | struct lttng_evaluation *evaluation = NULL; | |
1908 | enum lttng_condition_type condition_type; | |
1831ae68 | 1909 | bool client_list_is_empty; |
ed327204 JG |
1910 | |
1911 | trigger = trigger_list_element->trigger; | |
1912 | condition = lttng_trigger_get_const_condition(trigger); | |
1913 | assert(condition); | |
1914 | condition_type = lttng_condition_get_type(condition); | |
1915 | ||
1916 | if (condition_type == LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING && | |
1917 | cmd_type != NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_ONGOING) { | |
1918 | continue; | |
1919 | } else if (condition_type == LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED && | |
1920 | cmd_type != NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_COMPLETED) { | |
1921 | continue; | |
1922 | } | |
1923 | ||
1924 | action = lttng_trigger_get_const_action(trigger); | |
1925 | ||
1926 | /* Notify actions are the only type currently supported. */ | |
1927 | assert(lttng_action_get_type_const(action) == | |
1928 | LTTNG_ACTION_TYPE_NOTIFY); | |
1929 | ||
1930 | client_list = get_client_list_from_condition(state, condition); | |
1931 | assert(client_list); | |
1932 | ||
1831ae68 FD |
1933 | pthread_mutex_lock(&client_list->lock); |
1934 | client_list_is_empty = cds_list_empty(&client_list->list); | |
1935 | pthread_mutex_unlock(&client_list->lock); | |
1936 | if (client_list_is_empty) { | |
ed327204 JG |
1937 | /* |
1938 | * No clients interested in the evaluation's result, | |
1939 | * skip it. | |
1940 | */ | |
1941 | continue; | |
1942 | } | |
1943 | ||
1944 | if (cmd_type == NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_ONGOING) { | |
1945 | evaluation = lttng_evaluation_session_rotation_ongoing_create( | |
1946 | trace_archive_chunk_id); | |
1947 | } else { | |
1948 | evaluation = lttng_evaluation_session_rotation_completed_create( | |
1949 | trace_archive_chunk_id, location); | |
1950 | } | |
1951 | ||
1952 | if (!evaluation) { | |
1953 | /* Internal error */ | |
1954 | ret = -1; | |
1955 | cmd_result = LTTNG_ERR_UNK; | |
1831ae68 | 1956 | goto put_list; |
ed327204 JG |
1957 | } |
1958 | ||
1959 | /* Dispatch evaluation result to all clients. */ | |
1960 | ret = send_evaluation_to_clients(trigger_list_element->trigger, | |
1961 | evaluation, client_list, state, | |
1962 | session_info->uid, | |
1963 | session_info->gid); | |
1964 | lttng_evaluation_destroy(evaluation); | |
1831ae68 FD |
1965 | put_list: |
1966 | notification_client_list_put(client_list); | |
ed327204 | 1967 | if (caa_unlikely(ret)) { |
1831ae68 | 1968 | break; |
ed327204 JG |
1969 | } |
1970 | } | |
1971 | end: | |
1972 | session_info_put(session_info); | |
1973 | *_cmd_result = cmd_result; | |
1974 | rcu_read_unlock(); | |
1975 | return ret; | |
0ca52944 JG |
1976 | } |
1977 | ||
1da26331 | 1978 | static |
1831ae68 FD |
1979 | int handle_notification_thread_command_add_application( |
1980 | struct notification_thread_handle *handle, | |
1981 | struct notification_thread_state *state, | |
1982 | int read_side_trigger_event_application_pipe, | |
1983 | enum lttng_error_code *_cmd_result) | |
1da26331 | 1984 | { |
1831ae68 FD |
1985 | int ret = 0; |
1986 | enum lttng_error_code cmd_result = LTTNG_OK; | |
1987 | struct notification_event_trigger_source_element *element = NULL; | |
1da26331 | 1988 | |
1831ae68 FD |
1989 | element = zmalloc(sizeof(*element)); |
1990 | if (!element) { | |
1991 | cmd_result = LTTNG_ERR_NOMEM; | |
1992 | ret = -1; | |
1993 | goto end; | |
1994 | } | |
1da26331 | 1995 | |
1831ae68 FD |
1996 | CDS_INIT_LIST_HEAD(&element->node); |
1997 | element->fd = read_side_trigger_event_application_pipe; | |
1da26331 | 1998 | |
1831ae68 FD |
1999 | pthread_mutex_lock(&handle->event_trigger_sources.lock); |
2000 | cds_list_add(&element->node, &handle->event_trigger_sources.list); | |
2001 | pthread_mutex_unlock(&handle->event_trigger_sources.lock); | |
1da26331 | 2002 | |
1831ae68 FD |
2003 | /* TODO: remove on failure to add to list? */ |
2004 | ||
2005 | /* Adding the read side pipe to the event poll */ | |
2006 | ret = lttng_poll_add(&state->events, | |
2007 | read_side_trigger_event_application_pipe, | |
2008 | LPOLLIN | LPOLLERR); | |
2009 | ||
2010 | DBG3("[notification-thread] Adding application event source from fd: %d", read_side_trigger_event_application_pipe); | |
2011 | if (ret < 0) { | |
2012 | /* TODO: what should be the value of cmd_result??? */ | |
2013 | ERR("[notification-thread] Failed to add event source pipe fd to pollset"); | |
2014 | goto end; | |
1da26331 | 2015 | } |
1831ae68 | 2016 | |
1da26331 | 2017 | end: |
1831ae68 | 2018 | *_cmd_result = cmd_result; |
1da26331 JG |
2019 | return ret; |
2020 | } | |
2021 | ||
51eab943 | 2022 | static |
1831ae68 FD |
2023 | int handle_notification_thread_command_remove_application( |
2024 | struct notification_thread_handle *handle, | |
2025 | struct notification_thread_state *state, | |
2026 | int read_side_trigger_event_application_pipe, | |
2027 | enum lttng_error_code *_cmd_result) | |
51eab943 JG |
2028 | { |
2029 | int ret = 0; | |
1831ae68 | 2030 | enum lttng_error_code cmd_result = LTTNG_OK; |
51eab943 | 2031 | |
1831ae68 FD |
2032 | /* TODO: missing a lock propably to revisit */ |
2033 | struct notification_event_trigger_source_element *source_element, *tmp; | |
2034 | cds_list_for_each_entry_safe(source_element, tmp, | |
2035 | &handle->event_trigger_sources.list, node) { | |
2036 | if (source_element->fd != read_side_trigger_event_application_pipe) { | |
2037 | continue; | |
2038 | } | |
2039 | ||
2040 | DBG("[notification-thread] Removed event source from event source list"); | |
2041 | cds_list_del(&source_element->node); | |
2042 | break; | |
2043 | } | |
2044 | ||
2045 | DBG3("[notification-thread] Removing application event source from fd: %d", read_side_trigger_event_application_pipe); | |
2046 | /* Removing the read side pipe to the event poll */ | |
2047 | ret = lttng_poll_del(&state->events, | |
2048 | read_side_trigger_event_application_pipe); | |
2049 | if (ret < 0) { | |
2050 | /* TODO: what should be the value of cmd_result??? */ | |
2051 | ERR("[notification-thread] Failed to remove event source pipe fd from pollset"); | |
2052 | goto end; | |
2053 | } | |
2054 | ||
2055 | end: | |
2056 | *_cmd_result = cmd_result; | |
2057 | return ret; | |
2058 | } | |
2059 | ||
2060 | static int handle_notification_thread_command_get_tokens( | |
2061 | struct notification_thread_handle *handle, | |
2062 | struct notification_thread_state *state, | |
2063 | struct lttng_triggers **triggers, | |
2064 | enum lttng_error_code *_cmd_result) | |
2065 | { | |
2066 | int ret = 0, i = 0; | |
2067 | enum lttng_error_code cmd_result = LTTNG_OK; | |
2068 | struct cds_lfht_iter iter; | |
2069 | struct notification_trigger_tokens_ht_element *element; | |
2070 | struct lttng_triggers *local_triggers = NULL; | |
2071 | ||
2072 | local_triggers = lttng_triggers_create(); | |
2073 | if (!local_triggers) { | |
2074 | cmd_result = LTTNG_ERR_NOMEM; | |
2075 | goto end; | |
2076 | } | |
2077 | ||
2078 | rcu_read_lock(); | |
2079 | cds_lfht_for_each_entry ( | |
2080 | state->trigger_tokens_ht, &iter, element, node) { | |
2081 | ret = lttng_triggers_add(local_triggers, element->trigger); | |
2082 | if (ret < 0) { | |
2083 | cmd_result = LTTNG_ERR_FATAL; | |
2084 | ret = -1; | |
2085 | goto end; | |
2086 | } | |
2087 | ||
2088 | /* Ownership is shared with the lttng_triggers object */ | |
2089 | lttng_trigger_get(element->trigger); | |
2090 | ||
2091 | i++; | |
2092 | } | |
2093 | ||
2094 | /* Passing ownership up */ | |
2095 | *triggers = local_triggers; | |
2096 | local_triggers = NULL; | |
2097 | ||
2098 | end: | |
2099 | rcu_read_unlock(); | |
2100 | lttng_triggers_destroy(local_triggers); | |
2101 | *_cmd_result = cmd_result; | |
2102 | return ret; | |
2103 | } | |
2104 | ||
2105 | static | |
2106 | int handle_notification_thread_command_list_triggers( | |
2107 | struct notification_thread_handle *handle, | |
2108 | struct notification_thread_state *state, | |
2109 | uid_t uid, | |
2110 | gid_t gid, | |
2111 | struct lttng_triggers **triggers, | |
2112 | enum lttng_error_code *_cmd_result) | |
2113 | { | |
2114 | int ret = 0, i = 0; | |
2115 | enum lttng_error_code cmd_result = LTTNG_OK; | |
2116 | struct cds_lfht_iter iter; | |
2117 | struct lttng_trigger_ht_element *trigger_ht_element; | |
2118 | struct lttng_triggers *local_triggers = NULL; | |
2119 | const struct lttng_credentials *creds; | |
2120 | ||
2121 | long scb, sca; | |
2122 | unsigned long count; | |
2123 | ||
2124 | rcu_read_lock(); | |
2125 | cds_lfht_count_nodes(state->triggers_ht, &scb, &count, &sca); | |
2126 | ||
2127 | /* TODO check downcasting */ | |
2128 | local_triggers = lttng_triggers_create(); | |
2129 | if (!local_triggers) { | |
2130 | cmd_result = LTTNG_ERR_NOMEM; | |
2131 | goto end; | |
2132 | } | |
2133 | ||
2134 | cds_lfht_for_each_entry (state->triggers_ht, &iter, | |
2135 | trigger_ht_element, node) { | |
2136 | /* Only return the trigger for which the requestion client have | |
2137 | * access. For now the root user can only list its own | |
2138 | * triggers. | |
2139 | * TODO: root user behavior | |
2140 | */ | |
2141 | creds = lttng_trigger_get_credentials(trigger_ht_element->trigger); | |
2142 | if ((uid != creds->uid) || (gid != creds->gid)) { | |
2143 | continue; | |
2144 | } | |
2145 | ||
2146 | ret = lttng_triggers_add(local_triggers, trigger_ht_element->trigger); | |
2147 | if (ret < 0) { | |
2148 | ret = -1; | |
2149 | goto end; | |
2150 | } | |
2151 | /* Ownership is shared with the lttng_triggers object */ | |
2152 | lttng_trigger_get(trigger_ht_element->trigger); | |
2153 | ||
2154 | i++; | |
2155 | } | |
2156 | ||
2157 | /* Passing ownership up */ | |
2158 | *triggers = local_triggers; | |
2159 | local_triggers = NULL; | |
2160 | ||
2161 | end: | |
2162 | rcu_read_unlock(); | |
2163 | lttng_triggers_destroy(local_triggers); | |
2164 | *_cmd_result = cmd_result; | |
2165 | return ret; | |
2166 | } | |
2167 | ||
2168 | static | |
2169 | int condition_is_supported(struct lttng_condition *condition) | |
2170 | { | |
2171 | int ret; | |
2172 | ||
2173 | switch (lttng_condition_get_type(condition)) { | |
2174 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
2175 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
2176 | { | |
2177 | enum lttng_domain_type domain; | |
2178 | ||
2179 | ret = lttng_condition_buffer_usage_get_domain_type(condition, | |
2180 | &domain); | |
2181 | if (ret) { | |
2182 | ret = -1; | |
2183 | goto end; | |
2184 | } | |
2185 | ||
2186 | if (domain != LTTNG_DOMAIN_KERNEL) { | |
2187 | ret = 1; | |
2188 | goto end; | |
2189 | } | |
2190 | ||
2191 | /* | |
2192 | * Older kernel tracers don't expose the API to monitor their | |
2193 | * buffers. Therefore, we reject triggers that require that | |
2194 | * mechanism to be available to be evaluated. | |
2195 | */ | |
2196 | ret = kernel_supports_ring_buffer_snapshot_sample_positions(); | |
2197 | break; | |
2198 | } | |
2199 | case LTTNG_CONDITION_TYPE_EVENT_RULE_HIT: | |
2200 | { | |
2201 | /* TODO: | |
2202 | * Check for kernel support. | |
2203 | * Check for ust support ?? | |
2204 | */ | |
2205 | ret = 1; | |
2206 | break; | |
2207 | } | |
2208 | default: | |
2209 | ret = 1; | |
2210 | } | |
2211 | end: | |
2212 | return ret; | |
2213 | } | |
2214 | ||
2215 | static | |
2216 | int action_is_supported(struct lttng_action *action) | |
2217 | { | |
2218 | int ret; | |
2219 | ||
2220 | switch (lttng_action_get_type(action)) { | |
2221 | case LTTNG_ACTION_TYPE_NOTIFY: | |
2222 | case LTTNG_ACTION_TYPE_START_SESSION: | |
2223 | case LTTNG_ACTION_TYPE_STOP_SESSION: | |
2224 | case LTTNG_ACTION_TYPE_ROTATE_SESSION: | |
2225 | case LTTNG_ACTION_TYPE_SNAPSHOT_SESSION: | |
2226 | { | |
2227 | /* TODO validate that this is true for kernel in regards to | |
2228 | * rotation and snapshot. Start stop is not a problem notify | |
2229 | * either. | |
2230 | */ | |
2231 | /* For now all type of actions are supported */ | |
2232 | ret = 1; | |
2233 | break; | |
2234 | } | |
2235 | case LTTNG_ACTION_TYPE_GROUP: | |
2236 | { | |
2237 | /* TODO: Iterate over all internal actions and validate that | |
2238 | * they are supported | |
2239 | */ | |
2240 | ret = 1; | |
2241 | break; | |
2242 | ||
2243 | } | |
2244 | default: | |
2245 | ret = 1; | |
2246 | } | |
2247 | ||
2248 | return ret; | |
2249 | } | |
2250 | ||
2251 | /* Must be called with RCU read lock held. */ | |
2252 | static | |
2253 | int bind_trigger_to_matching_session(struct lttng_trigger *trigger, | |
2254 | struct notification_thread_state *state) | |
2255 | { | |
2256 | int ret = 0; | |
2257 | const struct lttng_condition *condition; | |
2258 | const char *session_name; | |
2259 | struct lttng_session_trigger_list *trigger_list; | |
2260 | ||
2261 | condition = lttng_trigger_get_const_condition(trigger); | |
2262 | switch (lttng_condition_get_type(condition)) { | |
2263 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING: | |
2264 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED: | |
2265 | { | |
2266 | enum lttng_condition_status status; | |
51eab943 JG |
2267 | |
2268 | status = lttng_condition_session_rotation_get_session_name( | |
2269 | condition, &session_name); | |
2270 | if (status != LTTNG_CONDITION_STATUS_OK) { | |
2271 | ERR("[notification-thread] Failed to bind trigger to session: unable to get 'session_rotation' condition's session name"); | |
2272 | ret = -1; | |
2273 | goto end; | |
2274 | } | |
2275 | break; | |
2276 | } | |
2277 | default: | |
2278 | ret = -1; | |
2279 | goto end; | |
2280 | } | |
2281 | ||
ed327204 JG |
2282 | trigger_list = get_session_trigger_list(state, session_name); |
2283 | if (!trigger_list) { | |
51eab943 JG |
2284 | DBG("[notification-thread] Unable to bind trigger applying to session \"%s\" as it is not yet known to the notification system", |
2285 | session_name); | |
2286 | goto end; | |
51eab943 | 2287 | |
ed327204 | 2288 | } |
51eab943 JG |
2289 | |
2290 | DBG("[notification-thread] Newly registered trigger bound to session \"%s\"", | |
2291 | session_name); | |
2292 | ret = lttng_session_trigger_list_add(trigger_list, trigger); | |
2293 | end: | |
2294 | return ret; | |
2295 | } | |
2296 | ||
2297 | /* Must be called with RCU read lock held. */ | |
2298 | static | |
1831ae68 | 2299 | int bind_trigger_to_matching_channels(struct lttng_trigger *trigger, |
51eab943 JG |
2300 | struct notification_thread_state *state) |
2301 | { | |
2302 | int ret = 0; | |
2303 | struct cds_lfht_node *node; | |
2304 | struct cds_lfht_iter iter; | |
2305 | struct channel_info *channel; | |
2306 | ||
2307 | cds_lfht_for_each_entry(state->channels_ht, &iter, channel, | |
2308 | channels_ht_node) { | |
2309 | struct lttng_trigger_list_element *trigger_list_element; | |
2310 | struct lttng_channel_trigger_list *trigger_list; | |
a5d64ae7 | 2311 | struct cds_lfht_iter lookup_iter; |
51eab943 JG |
2312 | |
2313 | if (!trigger_applies_to_channel(trigger, channel)) { | |
2314 | continue; | |
2315 | } | |
2316 | ||
2317 | cds_lfht_lookup(state->channel_triggers_ht, | |
2318 | hash_channel_key(&channel->key), | |
2319 | match_channel_trigger_list, | |
2320 | &channel->key, | |
a5d64ae7 MD |
2321 | &lookup_iter); |
2322 | node = cds_lfht_iter_get_node(&lookup_iter); | |
51eab943 JG |
2323 | assert(node); |
2324 | trigger_list = caa_container_of(node, | |
2325 | struct lttng_channel_trigger_list, | |
2326 | channel_triggers_ht_node); | |
2327 | ||
2328 | trigger_list_element = zmalloc(sizeof(*trigger_list_element)); | |
2329 | if (!trigger_list_element) { | |
2330 | ret = -1; | |
2331 | goto end; | |
2332 | } | |
2333 | CDS_INIT_LIST_HEAD(&trigger_list_element->node); | |
2334 | trigger_list_element->trigger = trigger; | |
2335 | cds_list_add(&trigger_list_element->node, &trigger_list->list); | |
2336 | DBG("[notification-thread] Newly registered trigger bound to channel \"%s\"", | |
2337 | channel->name); | |
2338 | } | |
2339 | end: | |
2340 | return ret; | |
2341 | } | |
2342 | ||
1831ae68 | 2343 | static int action_notify_register_trigger( |
8abe313a | 2344 | struct notification_thread_state *state, |
1831ae68 | 2345 | struct lttng_trigger *trigger) |
ab0ee2ca | 2346 | { |
1831ae68 | 2347 | |
ab0ee2ca JG |
2348 | int ret = 0; |
2349 | struct lttng_condition *condition; | |
2350 | struct notification_client *client; | |
2351 | struct notification_client_list *client_list = NULL; | |
ab0ee2ca | 2352 | struct cds_lfht_iter iter; |
1831ae68 | 2353 | struct notification_client_list_element *client_list_element, *tmp; |
ab0ee2ca JG |
2354 | |
2355 | condition = lttng_trigger_get_condition(trigger); | |
1da26331 JG |
2356 | assert(condition); |
2357 | ||
1831ae68 | 2358 | client_list = notification_client_list_create(trigger); |
ab0ee2ca JG |
2359 | if (!client_list) { |
2360 | ret = -1; | |
1831ae68 | 2361 | goto end; |
ab0ee2ca | 2362 | } |
ab0ee2ca JG |
2363 | |
2364 | /* Build a list of clients to which this new trigger applies. */ | |
2365 | cds_lfht_for_each_entry(state->client_socket_ht, &iter, client, | |
2366 | client_socket_ht_node) { | |
2367 | if (!trigger_applies_to_client(trigger, client)) { | |
2368 | continue; | |
2369 | } | |
2370 | ||
2371 | client_list_element = zmalloc(sizeof(*client_list_element)); | |
2372 | if (!client_list_element) { | |
2373 | ret = -1; | |
1831ae68 | 2374 | goto error_put_client_list; |
ab0ee2ca JG |
2375 | } |
2376 | CDS_INIT_LIST_HEAD(&client_list_element->node); | |
2377 | client_list_element->client = client; | |
2378 | cds_list_add(&client_list_element->node, &client_list->list); | |
2379 | } | |
2380 | ||
f82f93a1 | 2381 | switch (get_condition_binding_object(condition)) { |
51eab943 JG |
2382 | case LTTNG_OBJECT_TYPE_SESSION: |
2383 | /* Add the trigger to the list if it matches a known session. */ | |
2384 | ret = bind_trigger_to_matching_session(trigger, state); | |
2385 | if (ret) { | |
1831ae68 | 2386 | goto error_put_client_list; |
ab0ee2ca | 2387 | } |
f82f93a1 | 2388 | break; |
51eab943 JG |
2389 | case LTTNG_OBJECT_TYPE_CHANNEL: |
2390 | /* | |
2391 | * Add the trigger to list of triggers bound to the channels | |
2392 | * currently known. | |
2393 | */ | |
2394 | ret = bind_trigger_to_matching_channels(trigger, state); | |
2395 | if (ret) { | |
1831ae68 | 2396 | goto error_put_client_list; |
ab0ee2ca | 2397 | } |
51eab943 JG |
2398 | break; |
2399 | case LTTNG_OBJECT_TYPE_NONE: | |
2400 | break; | |
2401 | default: | |
2402 | ERR("[notification-thread] Unknown object type on which to bind a newly registered trigger was encountered"); | |
2403 | ret = -1; | |
1831ae68 | 2404 | goto error_put_client_list; |
ab0ee2ca JG |
2405 | } |
2406 | ||
2ae99f0b JG |
2407 | /* |
2408 | * Since there is nothing preventing clients from subscribing to a | |
2409 | * condition before the corresponding trigger is registered, we have | |
2410 | * to evaluate this new condition right away. | |
2411 | * | |
2412 | * At some point, we were waiting for the next "evaluation" (e.g. on | |
2413 | * reception of a channel sample) to evaluate this new condition, but | |
2414 | * that was broken. | |
2415 | * | |
2416 | * The reason it was broken is that waiting for the next sample | |
2417 | * does not allow us to properly handle transitions for edge-triggered | |
2418 | * conditions. | |
2419 | * | |
2420 | * Consider this example: when we handle a new channel sample, we | |
2421 | * evaluate each conditions twice: once with the previous state, and | |
2422 | * again with the newest state. We then use those two results to | |
2423 | * determine whether a state change happened: a condition was false and | |
2424 | * became true. If a state change happened, we have to notify clients. | |
2425 | * | |
2426 | * Now, if a client subscribes to a given notification and registers | |
2427 | * a trigger *after* that subscription, we have to make sure the | |
2428 | * condition is evaluated at this point while considering only the | |
2429 | * current state. Otherwise, the next evaluation cycle may only see | |
2430 | * that the evaluations remain the same (true for samples n-1 and n) and | |
2431 | * the client will never know that the condition has been met. | |
1831ae68 FD |
2432 | * |
2433 | * No need to lock the list here as it has not been published yet. | |
2ae99f0b JG |
2434 | */ |
2435 | cds_list_for_each_entry_safe(client_list_element, tmp, | |
2436 | &client_list->list, node) { | |
2437 | ret = evaluate_condition_for_client(trigger, condition, | |
2438 | client_list_element->client, state); | |
2439 | if (ret) { | |
1831ae68 | 2440 | goto error_put_client_list; |
2ae99f0b JG |
2441 | } |
2442 | } | |
2443 | ||
2444 | /* | |
2445 | * Client list ownership transferred to the | |
2446 | * notification_trigger_clients_ht. | |
2447 | */ | |
1831ae68 | 2448 | publish_notification_client_list(state, client_list); |
2ae99f0b | 2449 | client_list = NULL; |
1831ae68 FD |
2450 | error_put_client_list: |
2451 | notification_client_list_put(client_list); | |
2452 | end: | |
2453 | return ret; | |
2454 | } | |
2ae99f0b | 2455 | |
1831ae68 FD |
2456 | static |
2457 | bool trigger_name_taken(struct notification_thread_state *state, const char *name) | |
2458 | { | |
2459 | struct cds_lfht_node *triggers_by_name_ht_node; | |
2460 | struct cds_lfht_iter iter; | |
2461 | /* TODO change hashing for trigger */ | |
2462 | cds_lfht_lookup(state->triggers_by_name_ht, | |
2463 | hash_key_str(name, lttng_ht_seed), | |
2464 | match_str, | |
2465 | name, | |
2466 | &iter); | |
2467 | triggers_by_name_ht_node = cds_lfht_iter_get_node(&iter); | |
2468 | if (triggers_by_name_ht_node) { | |
2469 | return true; | |
2470 | } else { | |
2471 | return false; | |
2472 | } | |
2473 | ||
2474 | } | |
2475 | static | |
2476 | void generate_trigger_name(struct notification_thread_state *state, struct lttng_trigger *trigger, const char **name) | |
2477 | { | |
2478 | /* Here the offset criteria guarantee an end. This will be a nice | |
2479 | * bikeshedding conversation. I would simply generate uuid and use them | |
2480 | * as trigger name. | |
2481 | */ | |
2482 | bool taken = false; | |
2483 | do { | |
2484 | lttng_trigger_generate_name(trigger, state->trigger_id.name_offset); | |
2485 | /* TODO error checking */ | |
2486 | lttng_trigger_get_name(trigger, name); | |
2487 | taken = trigger_name_taken(state, *name); | |
2488 | if (taken) { | |
2489 | state->trigger_id.name_offset++; | |
2490 | } | |
2491 | } while (taken || state->trigger_id.name_offset == UINT32_MAX); | |
2492 | } | |
2493 | ||
2494 | static bool action_is_notify(const struct lttng_action *action) | |
2495 | { | |
2496 | /* TODO for action groups we need to iterate over all of them */ | |
2497 | enum lttng_action_type type = lttng_action_get_type_const(action); | |
2498 | bool ret = false; | |
2499 | enum lttng_action_status status; | |
2500 | const struct lttng_action *tmp; | |
2501 | unsigned int i, count; | |
2502 | ||
2503 | switch (type) { | |
2504 | case LTTNG_ACTION_TYPE_NOTIFY: | |
2505 | ret = true; | |
2506 | break; | |
2507 | case LTTNG_ACTION_TYPE_GROUP: | |
2508 | status = lttng_action_group_get_count(action, &count); | |
2509 | if (status != LTTNG_ACTION_STATUS_OK) { | |
2510 | assert(0); | |
2511 | } | |
2512 | for (i = 0; i < count; i++) { | |
2513 | tmp = lttng_action_group_get_at_index_const(action, i); | |
2514 | assert(tmp); | |
2515 | ret = action_is_notify(tmp); | |
2516 | if (ret) { | |
2517 | break; | |
2518 | } | |
2519 | } | |
2520 | break; | |
2521 | default: | |
2522 | ret = false; | |
2523 | break; | |
2524 | } | |
2525 | ||
2526 | return ret; | |
2527 | } | |
2528 | ||
2529 | /* | |
2530 | * TODO: REVIEW THIS COMMENT. | |
2531 | * FIXME A client's credentials are not checked when registering a trigger, nor | |
2532 | * are they stored alongside with the trigger. | |
2533 | * | |
2534 | * The effects of this are benign since: | |
2535 | * - The client will succeed in registering the trigger, as it is valid, | |
2536 | * - The trigger will, internally, be bound to the channel/session, | |
2537 | * - The notifications will not be sent since the client's credentials | |
2538 | * are checked against the channel at that moment. | |
2539 | * | |
2540 | * If this function returns a non-zero value, it means something is | |
2541 | * fundamentally broken and the whole subsystem/thread will be torn down. | |
2542 | * | |
2543 | * If a non-fatal error occurs, just set the cmd_result to the appropriate | |
2544 | * error code. | |
2545 | */ | |
2546 | static | |
2547 | int handle_notification_thread_command_register_trigger( | |
2548 | struct notification_thread_state *state, | |
2549 | struct lttng_trigger *trigger, | |
2550 | enum lttng_error_code *cmd_result) | |
2551 | { | |
2552 | int ret = 0; | |
2553 | int is_supported; | |
2554 | struct lttng_condition *condition; | |
2555 | struct lttng_action *action; | |
2556 | struct lttng_trigger_ht_element *trigger_ht_element = NULL; | |
2557 | struct notification_trigger_tokens_ht_element *trigger_tokens_ht_element = NULL; | |
2558 | struct cds_lfht_node *node; | |
2559 | const char* trigger_name; | |
2560 | bool free_trigger = true; | |
2561 | ||
2562 | assert(trigger->creds.set); | |
2563 | ||
2564 | rcu_read_lock(); | |
2565 | ||
2566 | /* Set the trigger's key */ | |
2567 | lttng_trigger_set_key(trigger, state->trigger_id.token_generator); | |
2568 | ||
2569 | if (lttng_trigger_get_name(trigger, &trigger_name) == LTTNG_TRIGGER_STATUS_UNSET) { | |
2570 | generate_trigger_name(state, trigger, &trigger_name); | |
2571 | } else if (trigger_name_taken(state, trigger_name)) { | |
2572 | /* Not a fatal error */ | |
2573 | *cmd_result = LTTNG_ERR_TRIGGER_EXISTS; | |
2574 | ret = 0; | |
2575 | goto error; | |
2576 | } | |
2577 | ||
2578 | condition = lttng_trigger_get_condition(trigger); | |
2579 | assert(condition); | |
2580 | ||
2581 | action = lttng_trigger_get_action(trigger); | |
2582 | assert(action); | |
2583 | ||
2584 | is_supported = condition_is_supported(condition); | |
2585 | if (is_supported < 0) { | |
2586 | goto error; | |
2587 | } else if (is_supported == 0) { | |
2588 | ret = 0; | |
2589 | *cmd_result = LTTNG_ERR_NOT_SUPPORTED; | |
2590 | goto error; | |
2591 | } | |
2592 | ||
2593 | is_supported = action_is_supported(action); | |
2594 | if (is_supported < 0) { | |
2595 | goto error; | |
2596 | } else if (is_supported == 0) { | |
2597 | ret = 0; | |
2598 | *cmd_result = LTTNG_ERR_NOT_SUPPORTED; | |
2599 | goto error; | |
2600 | } | |
2601 | ||
2602 | trigger_ht_element = zmalloc(sizeof(*trigger_ht_element)); | |
2603 | if (!trigger_ht_element) { | |
2604 | ret = -1; | |
2605 | goto error; | |
2606 | } | |
2607 | ||
2608 | /* Add trigger to the trigger_ht. */ | |
2609 | cds_lfht_node_init(&trigger_ht_element->node); | |
2610 | cds_lfht_node_init(&trigger_ht_element->node_by_name); | |
2611 | ||
2612 | /* | |
2613 | * This element own the trigger object from now own, this is why there | |
2614 | * is no lttng_trigger_get here. | |
2615 | * This thread is now the owner of the trigger object. | |
2616 | */ | |
2617 | trigger_ht_element->trigger = trigger; | |
2618 | ||
2619 | node = cds_lfht_add_unique(state->triggers_ht, | |
2620 | lttng_condition_hash(condition), | |
2621 | match_trigger, | |
2622 | trigger, | |
2623 | &trigger_ht_element->node); | |
2624 | if (node != &trigger_ht_element->node) { | |
2625 | /* Not a fatal error, simply report it to the client. */ | |
2626 | *cmd_result = LTTNG_ERR_TRIGGER_EXISTS; | |
2627 | goto error_free_ht_element; | |
2628 | } | |
2629 | ||
2630 | node = cds_lfht_add_unique(state->triggers_by_name_ht, | |
2631 | hash_key_str(trigger_name, lttng_ht_seed), | |
2632 | match_str, | |
2633 | trigger_name, | |
2634 | &trigger_ht_element->node_by_name); | |
2635 | if (node != &trigger_ht_element->node_by_name) { | |
2636 | /* This should never happen */ | |
2637 | /* Not a fatal error, simply report it to the client. */ | |
2638 | /* TODO remove from the trigger_ht */ | |
2639 | *cmd_result = LTTNG_ERR_TRIGGER_EXISTS; | |
2640 | goto error_free_ht_element; | |
2641 | } | |
2642 | ||
2643 | if (lttng_condition_get_type(condition) == LTTNG_CONDITION_TYPE_EVENT_RULE_HIT) { | |
2644 | trigger_tokens_ht_element = zmalloc(sizeof(*trigger_tokens_ht_element)); | |
2645 | if (!trigger_tokens_ht_element) { | |
2646 | ret = -1; | |
2647 | goto error; | |
2648 | } | |
2649 | ||
2650 | /* Add trigger token to the trigger_tokens_ht. */ | |
2651 | cds_lfht_node_init(&trigger_tokens_ht_element->node); | |
2652 | trigger_tokens_ht_element->token = trigger->key.value; | |
2653 | trigger_tokens_ht_element->trigger = trigger; | |
2654 | ||
2655 | node = cds_lfht_add_unique(state->trigger_tokens_ht, | |
2656 | hash_key_u64(&trigger_tokens_ht_element->token, lttng_ht_seed), | |
2657 | match_trigger_token, | |
2658 | &trigger_tokens_ht_element->token, | |
2659 | &trigger_tokens_ht_element->node); | |
2660 | if (node != &trigger_tokens_ht_element->node) { | |
2661 | /* TODO: THIS IS A FATAL ERROR... should never happen */ | |
2662 | /* Not a fatal error, simply report it to the client. */ | |
2663 | *cmd_result = LTTNG_ERR_TRIGGER_EXISTS; | |
2664 | goto error_free_ht_element; | |
2665 | } | |
2666 | } | |
2667 | ||
2668 | /* | |
2669 | * Ownership of the trigger and of its wrapper was transfered to | |
2670 | * the triggers_ht. Same for token ht element if necessary. | |
2671 | */ | |
2672 | trigger_tokens_ht_element = NULL; | |
2673 | trigger_ht_element = NULL; | |
2674 | free_trigger = false; | |
2675 | ||
2676 | if (action_is_notify(action)) { | |
2677 | ret = action_notify_register_trigger(state, trigger); | |
2678 | if (ret < 0) { | |
2679 | /* TODO should cmd_result be set here? */ | |
2680 | ret = -1; | |
2681 | goto error_free_ht_element; | |
ab0ee2ca | 2682 | } |
ab0ee2ca | 2683 | } |
1831ae68 FD |
2684 | |
2685 | /* Increment the trigger unique id generator */ | |
2686 | state->trigger_id.token_generator++; | |
2687 | *cmd_result = LTTNG_OK; | |
2688 | ||
ab0ee2ca JG |
2689 | error_free_ht_element: |
2690 | free(trigger_ht_element); | |
1831ae68 | 2691 | free(trigger_tokens_ht_element); |
ab0ee2ca JG |
2692 | error: |
2693 | if (free_trigger) { | |
ab0ee2ca JG |
2694 | lttng_trigger_destroy(trigger); |
2695 | } | |
2696 | rcu_read_unlock(); | |
2697 | return ret; | |
2698 | } | |
2699 | ||
83b934ad | 2700 | static |
1831ae68 | 2701 | void free_lttng_trigger_ht_element_rcu(struct rcu_head *node) |
83b934ad | 2702 | { |
1831ae68 | 2703 | free(caa_container_of(node, struct lttng_trigger_ht_element, |
83b934ad MD |
2704 | rcu_node)); |
2705 | } | |
2706 | ||
2707 | static | |
1831ae68 | 2708 | void free_notification_trigger_tokens_ht_element_rcu(struct rcu_head *node) |
83b934ad | 2709 | { |
1831ae68 | 2710 | free(caa_container_of(node, struct notification_trigger_tokens_ht_element, |
83b934ad MD |
2711 | rcu_node)); |
2712 | } | |
2713 | ||
cc2295b5 | 2714 | static |
ab0ee2ca JG |
2715 | int handle_notification_thread_command_unregister_trigger( |
2716 | struct notification_thread_state *state, | |
2717 | struct lttng_trigger *trigger, | |
2718 | enum lttng_error_code *_cmd_reply) | |
2719 | { | |
2720 | struct cds_lfht_iter iter; | |
ed327204 | 2721 | struct cds_lfht_node *triggers_ht_node; |
ab0ee2ca JG |
2722 | struct lttng_channel_trigger_list *trigger_list; |
2723 | struct notification_client_list *client_list; | |
ab0ee2ca JG |
2724 | struct lttng_trigger_ht_element *trigger_ht_element = NULL; |
2725 | struct lttng_condition *condition = lttng_trigger_get_condition( | |
2726 | trigger); | |
1831ae68 | 2727 | struct lttng_action *action = lttng_trigger_get_action(trigger); |
ab0ee2ca JG |
2728 | enum lttng_error_code cmd_reply; |
2729 | ||
2730 | rcu_read_lock(); | |
2731 | ||
1831ae68 FD |
2732 | /* TODO change hashing for trigger */ |
2733 | /* TODO Disabling for the root user is not complete, for now the root | |
2734 | * user cannot disable the trigger from another user. | |
2735 | */ | |
ab0ee2ca JG |
2736 | cds_lfht_lookup(state->triggers_ht, |
2737 | lttng_condition_hash(condition), | |
1831ae68 FD |
2738 | match_trigger, |
2739 | trigger, | |
ab0ee2ca JG |
2740 | &iter); |
2741 | triggers_ht_node = cds_lfht_iter_get_node(&iter); | |
2742 | if (!triggers_ht_node) { | |
2743 | cmd_reply = LTTNG_ERR_TRIGGER_NOT_FOUND; | |
2744 | goto end; | |
2745 | } else { | |
2746 | cmd_reply = LTTNG_OK; | |
2747 | } | |
2748 | ||
2749 | /* Remove trigger from channel_triggers_ht. */ | |
2750 | cds_lfht_for_each_entry(state->channel_triggers_ht, &iter, trigger_list, | |
2751 | channel_triggers_ht_node) { | |
2752 | struct lttng_trigger_list_element *trigger_element, *tmp; | |
2753 | ||
2754 | cds_list_for_each_entry_safe(trigger_element, tmp, | |
2755 | &trigger_list->list, node) { | |
1831ae68 | 2756 | if (!lttng_trigger_is_equal(trigger, trigger_element->trigger)) { |
ab0ee2ca JG |
2757 | continue; |
2758 | } | |
2759 | ||
2760 | DBG("[notification-thread] Removed trigger from channel_triggers_ht"); | |
2761 | cds_list_del(&trigger_element->node); | |
e4db5ace JR |
2762 | /* A trigger can only appear once per channel */ |
2763 | break; | |
ab0ee2ca JG |
2764 | } |
2765 | } | |
2766 | ||
1831ae68 FD |
2767 | if (lttng_condition_get_type(condition) == LTTNG_CONDITION_TYPE_EVENT_RULE_HIT) { |
2768 | struct notification_trigger_tokens_ht_element *trigger_tokens_ht_element; | |
2769 | cds_lfht_for_each_entry(state->trigger_tokens_ht, &iter, trigger_tokens_ht_element, | |
2770 | node) { | |
2771 | if (!lttng_trigger_is_equal(trigger, trigger_tokens_ht_element->trigger)) { | |
2772 | continue; | |
2773 | } | |
ed327204 | 2774 | |
1831ae68 FD |
2775 | /* TODO talk to all app and remove it */ |
2776 | DBG("[notification-thread] Removed trigger from tokens_ht"); | |
2777 | cds_lfht_del(state->trigger_tokens_ht, | |
2778 | &trigger_tokens_ht_element->node); | |
2779 | call_rcu(&trigger_tokens_ht_element->rcu_node, free_notification_trigger_tokens_ht_element_rcu); | |
2780 | ||
2781 | break; | |
2782 | } | |
2783 | } | |
2784 | ||
2785 | if (action_is_notify(action)) { | |
2786 | /* | |
2787 | * Remove and release the client list from | |
2788 | * notification_trigger_clients_ht. | |
2789 | */ | |
2790 | client_list = get_client_list_from_condition(state, condition); | |
2791 | assert(client_list); | |
2792 | ||
2793 | /* Put new reference and the hashtable's reference. */ | |
2794 | notification_client_list_put(client_list); | |
2795 | notification_client_list_put(client_list); | |
2796 | client_list = NULL; | |
ab0ee2ca | 2797 | } |
ab0ee2ca JG |
2798 | |
2799 | /* Remove trigger from triggers_ht. */ | |
2800 | trigger_ht_element = caa_container_of(triggers_ht_node, | |
2801 | struct lttng_trigger_ht_element, node); | |
1831ae68 | 2802 | cds_lfht_del(state->triggers_by_name_ht, &trigger_ht_element->node_by_name); |
ab0ee2ca JG |
2803 | cds_lfht_del(state->triggers_ht, triggers_ht_node); |
2804 | ||
1831ae68 | 2805 | /* Release the ownership of the trigger */ |
ab0ee2ca | 2806 | lttng_trigger_destroy(trigger_ht_element->trigger); |
83b934ad | 2807 | call_rcu(&trigger_ht_element->rcu_node, free_lttng_trigger_ht_element_rcu); |
ab0ee2ca JG |
2808 | end: |
2809 | rcu_read_unlock(); | |
2810 | if (_cmd_reply) { | |
2811 | *_cmd_reply = cmd_reply; | |
2812 | } | |
2813 | return 0; | |
2814 | } | |
2815 | ||
2816 | /* Returns 0 on success, 1 on exit requested, negative value on error. */ | |
2817 | int handle_notification_thread_command( | |
2818 | struct notification_thread_handle *handle, | |
2819 | struct notification_thread_state *state) | |
2820 | { | |
2821 | int ret; | |
2822 | uint64_t counter; | |
2823 | struct notification_thread_command *cmd; | |
2824 | ||
8abe313a | 2825 | /* Read the event pipe to put it back into a quiescent state. */ |
18aeca05 | 2826 | ret = lttng_read(lttng_pipe_get_readfd(handle->cmd_queue.event_pipe), &counter, |
8abe313a | 2827 | sizeof(counter)); |
18aeca05 | 2828 | if (ret != sizeof(counter)) { |
ab0ee2ca JG |
2829 | goto error; |
2830 | } | |
2831 | ||
2832 | pthread_mutex_lock(&handle->cmd_queue.lock); | |
2833 | cmd = cds_list_first_entry(&handle->cmd_queue.list, | |
2834 | struct notification_thread_command, cmd_list_node); | |
2835 | switch (cmd->type) { | |
2836 | case NOTIFICATION_COMMAND_TYPE_REGISTER_TRIGGER: | |
2837 | DBG("[notification-thread] Received register trigger command"); | |
2838 | ret = handle_notification_thread_command_register_trigger( | |
2839 | state, cmd->parameters.trigger, | |
2840 | &cmd->reply_code); | |
2841 | break; | |
2842 | case NOTIFICATION_COMMAND_TYPE_UNREGISTER_TRIGGER: | |
2843 | DBG("[notification-thread] Received unregister trigger command"); | |
2844 | ret = handle_notification_thread_command_unregister_trigger( | |
2845 | state, cmd->parameters.trigger, | |
2846 | &cmd->reply_code); | |
2847 | break; | |
2848 | case NOTIFICATION_COMMAND_TYPE_ADD_CHANNEL: | |
2849 | DBG("[notification-thread] Received add channel command"); | |
2850 | ret = handle_notification_thread_command_add_channel( | |
8abe313a JG |
2851 | state, |
2852 | cmd->parameters.add_channel.session.name, | |
2853 | cmd->parameters.add_channel.session.uid, | |
2854 | cmd->parameters.add_channel.session.gid, | |
2855 | cmd->parameters.add_channel.channel.name, | |
2856 | cmd->parameters.add_channel.channel.domain, | |
2857 | cmd->parameters.add_channel.channel.key, | |
2858 | cmd->parameters.add_channel.channel.capacity, | |
ab0ee2ca JG |
2859 | &cmd->reply_code); |
2860 | break; | |
2861 | case NOTIFICATION_COMMAND_TYPE_REMOVE_CHANNEL: | |
2862 | DBG("[notification-thread] Received remove channel command"); | |
2863 | ret = handle_notification_thread_command_remove_channel( | |
2864 | state, cmd->parameters.remove_channel.key, | |
2865 | cmd->parameters.remove_channel.domain, | |
2866 | &cmd->reply_code); | |
2867 | break; | |
0ca52944 | 2868 | case NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_ONGOING: |
0ca52944 | 2869 | case NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_COMPLETED: |
ed327204 JG |
2870 | DBG("[notification-thread] Received session rotation %s command", |
2871 | cmd->type == NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_ONGOING ? | |
2872 | "ongoing" : "completed"); | |
2873 | ret = handle_notification_thread_command_session_rotation( | |
0ca52944 | 2874 | state, |
ed327204 JG |
2875 | cmd->type, |
2876 | cmd->parameters.session_rotation.session_name, | |
2877 | cmd->parameters.session_rotation.uid, | |
2878 | cmd->parameters.session_rotation.gid, | |
2879 | cmd->parameters.session_rotation.trace_archive_chunk_id, | |
2880 | cmd->parameters.session_rotation.location, | |
0ca52944 JG |
2881 | &cmd->reply_code); |
2882 | break; | |
1831ae68 FD |
2883 | case NOTIFICATION_COMMAND_TYPE_ADD_APPLICATION: |
2884 | ret = handle_notification_thread_command_add_application( | |
2885 | handle, | |
2886 | state, | |
2887 | cmd->parameters.application.read_side_trigger_event_application_pipe, | |
2888 | &cmd->reply_code); | |
2889 | break; | |
2890 | case NOTIFICATION_COMMAND_TYPE_REMOVE_APPLICATION: | |
2891 | ret = handle_notification_thread_command_remove_application( | |
2892 | handle, | |
2893 | state, | |
2894 | cmd->parameters.application.read_side_trigger_event_application_pipe, | |
2895 | &cmd->reply_code); | |
2896 | break; | |
2897 | case NOTIFICATION_COMMAND_TYPE_GET_TOKENS: | |
2898 | { | |
2899 | struct lttng_triggers *triggers = NULL; | |
2900 | ret = handle_notification_thread_command_get_tokens( | |
2901 | handle, state, &triggers, &cmd->reply_code); | |
2902 | cmd->reply.get_tokens.triggers = triggers; | |
2903 | ret = 0; | |
2904 | break; | |
2905 | ||
2906 | cmd->reply_code = LTTNG_OK; | |
2907 | ret = 0; | |
2908 | break; | |
2909 | } | |
2910 | case NOTIFICATION_COMMAND_TYPE_LIST_TRIGGERS: | |
2911 | { | |
2912 | struct lttng_triggers *triggers = NULL; | |
2913 | ret = handle_notification_thread_command_list_triggers( | |
2914 | handle, | |
2915 | state, | |
2916 | cmd->parameters.list_triggers.uid, | |
2917 | cmd->parameters.list_triggers.gid, | |
2918 | &triggers, | |
2919 | &cmd->reply_code); | |
2920 | cmd->reply.list_triggers.triggers = triggers; | |
2921 | ret = 0; | |
2922 | break; | |
2923 | } | |
ab0ee2ca JG |
2924 | case NOTIFICATION_COMMAND_TYPE_QUIT: |
2925 | DBG("[notification-thread] Received quit command"); | |
2926 | cmd->reply_code = LTTNG_OK; | |
2927 | ret = 1; | |
2928 | goto end; | |
2929 | default: | |
2930 | ERR("[notification-thread] Unknown internal command received"); | |
2931 | goto error_unlock; | |
2932 | } | |
2933 | ||
2934 | if (ret) { | |
2935 | goto error_unlock; | |
2936 | } | |
2937 | end: | |
2938 | cds_list_del(&cmd->cmd_list_node); | |
1831ae68 FD |
2939 | if (cmd->is_async) { |
2940 | free(cmd); | |
2941 | cmd = NULL; | |
2942 | } else { | |
2943 | lttng_waiter_wake_up(&cmd->reply_waiter); | |
2944 | } | |
ab0ee2ca JG |
2945 | pthread_mutex_unlock(&handle->cmd_queue.lock); |
2946 | return ret; | |
2947 | error_unlock: | |
2948 | /* Wake-up and return a fatal error to the calling thread. */ | |
8ada111f | 2949 | lttng_waiter_wake_up(&cmd->reply_waiter); |
ab0ee2ca JG |
2950 | pthread_mutex_unlock(&handle->cmd_queue.lock); |
2951 | cmd->reply_code = LTTNG_ERR_FATAL; | |
2952 | error: | |
2953 | /* Indicate a fatal error to the caller. */ | |
2954 | return -1; | |
2955 | } | |
2956 | ||
ab0ee2ca JG |
2957 | static |
2958 | int socket_set_non_blocking(int socket) | |
2959 | { | |
2960 | int ret, flags; | |
2961 | ||
2962 | /* Set the pipe as non-blocking. */ | |
2963 | ret = fcntl(socket, F_GETFL, 0); | |
2964 | if (ret == -1) { | |
2965 | PERROR("fcntl get socket flags"); | |
2966 | goto end; | |
2967 | } | |
2968 | flags = ret; | |
2969 | ||
2970 | ret = fcntl(socket, F_SETFL, flags | O_NONBLOCK); | |
2971 | if (ret == -1) { | |
2972 | PERROR("fcntl set O_NONBLOCK socket flag"); | |
2973 | goto end; | |
2974 | } | |
2975 | DBG("Client socket (fd = %i) set as non-blocking", socket); | |
2976 | end: | |
2977 | return ret; | |
2978 | } | |
2979 | ||
1831ae68 | 2980 | /* Client lock must be acquired by caller. */ |
ab0ee2ca | 2981 | static |
14fa22f8 | 2982 | int client_reset_inbound_state(struct notification_client *client) |
ab0ee2ca JG |
2983 | { |
2984 | int ret; | |
2985 | ||
1831ae68 FD |
2986 | ASSERT_LOCKED(client->lock); |
2987 | ||
ab0ee2ca JG |
2988 | ret = lttng_dynamic_buffer_set_size( |
2989 | &client->communication.inbound.buffer, 0); | |
2990 | assert(!ret); | |
2991 | ||
2992 | client->communication.inbound.bytes_to_receive = | |
2993 | sizeof(struct lttng_notification_channel_message); | |
2994 | client->communication.inbound.msg_type = | |
2995 | LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_UNKNOWN; | |
ab0ee2ca JG |
2996 | LTTNG_SOCK_SET_UID_CRED(&client->communication.inbound.creds, -1); |
2997 | LTTNG_SOCK_SET_GID_CRED(&client->communication.inbound.creds, -1); | |
14fa22f8 JG |
2998 | ret = lttng_dynamic_buffer_set_size( |
2999 | &client->communication.inbound.buffer, | |
3000 | client->communication.inbound.bytes_to_receive); | |
3001 | return ret; | |
ab0ee2ca JG |
3002 | } |
3003 | ||
3004 | int handle_notification_thread_client_connect( | |
3005 | struct notification_thread_state *state) | |
3006 | { | |
3007 | int ret; | |
3008 | struct notification_client *client; | |
3009 | ||
3010 | DBG("[notification-thread] Handling new notification channel client connection"); | |
3011 | ||
3012 | client = zmalloc(sizeof(*client)); | |
3013 | if (!client) { | |
3014 | /* Fatal error. */ | |
3015 | ret = -1; | |
3016 | goto error; | |
3017 | } | |
1831ae68 FD |
3018 | pthread_mutex_init(&client->lock, NULL); |
3019 | client->id = state->next_notification_client_id++; | |
ab0ee2ca JG |
3020 | CDS_INIT_LIST_HEAD(&client->condition_list); |
3021 | lttng_dynamic_buffer_init(&client->communication.inbound.buffer); | |
3022 | lttng_dynamic_buffer_init(&client->communication.outbound.buffer); | |
01ea340e | 3023 | client->communication.inbound.expect_creds = true; |
1831ae68 FD |
3024 | |
3025 | pthread_mutex_lock(&client->lock); | |
14fa22f8 | 3026 | ret = client_reset_inbound_state(client); |
1831ae68 | 3027 | pthread_mutex_unlock(&client->lock); |
14fa22f8 JG |
3028 | if (ret) { |
3029 | ERR("[notification-thread] Failed to reset client communication's inbound state"); | |
3030 | ret = 0; | |
3031 | goto error; | |
3032 | } | |
ab0ee2ca JG |
3033 | |
3034 | ret = lttcomm_accept_unix_sock(state->notification_channel_socket); | |
3035 | if (ret < 0) { | |
3036 | ERR("[notification-thread] Failed to accept new notification channel client connection"); | |
3037 | ret = 0; | |
3038 | goto error; | |
3039 | } | |
3040 | ||
3041 | client->socket = ret; | |
3042 | ||
3043 | ret = socket_set_non_blocking(client->socket); | |
3044 | if (ret) { | |
3045 | ERR("[notification-thread] Failed to set new notification channel client connection socket as non-blocking"); | |
3046 | goto error; | |
3047 | } | |
3048 | ||
3049 | ret = lttcomm_setsockopt_creds_unix_sock(client->socket); | |
3050 | if (ret < 0) { | |
3051 | ERR("[notification-thread] Failed to set socket options on new notification channel client socket"); | |
3052 | ret = 0; | |
3053 | goto error; | |
3054 | } | |
3055 | ||
3056 | ret = lttng_poll_add(&state->events, client->socket, | |
3057 | LPOLLIN | LPOLLERR | | |
3058 | LPOLLHUP | LPOLLRDHUP); | |
3059 | if (ret < 0) { | |
3060 | ERR("[notification-thread] Failed to add notification channel client socket to poll set"); | |
3061 | ret = 0; | |
3062 | goto error; | |
3063 | } | |
3064 | DBG("[notification-thread] Added new notification channel client socket (%i) to poll set", | |
3065 | client->socket); | |
3066 | ||
ab0ee2ca JG |
3067 | rcu_read_lock(); |
3068 | cds_lfht_add(state->client_socket_ht, | |
3069 | hash_client_socket(client->socket), | |
3070 | &client->client_socket_ht_node); | |
1831ae68 FD |
3071 | cds_lfht_add(state->client_id_ht, |
3072 | hash_client_id(client->id), | |
3073 | &client->client_id_ht_node); | |
ab0ee2ca JG |
3074 | rcu_read_unlock(); |
3075 | ||
3076 | return ret; | |
3077 | error: | |
3078 | notification_client_destroy(client, state); | |
3079 | return ret; | |
3080 | } | |
3081 | ||
1831ae68 FD |
3082 | /* RCU read-lock must be held by the caller. */ |
3083 | static | |
3084 | int notification_thread_client_disconnect( | |
3085 | struct notification_client *client, | |
ab0ee2ca | 3086 | struct notification_thread_state *state) |
1831ae68 FD |
3087 | { |
3088 | int ret; | |
3089 | struct lttng_condition_list_element *condition_list_element, *tmp; | |
3090 | ||
3091 | /* Acquire the client lock to disable its communication atomically. */ | |
3092 | pthread_mutex_lock(&client->lock); | |
3093 | client->communication.active = false; | |
3094 | ret = lttng_poll_del(&state->events, client->socket); | |
3095 | if (ret) { | |
3096 | ERR("[notification-thread] Failed to remove client socket %d from poll set", | |
3097 | client->socket); | |
3098 | } | |
3099 | pthread_mutex_unlock(&client->lock); | |
3100 | ||
3101 | cds_lfht_del(state->client_socket_ht, &client->client_socket_ht_node); | |
3102 | cds_lfht_del(state->client_id_ht, &client->client_id_ht_node); | |
3103 | ||
3104 | /* Release all conditions to which the client was subscribed. */ | |
3105 | cds_list_for_each_entry_safe(condition_list_element, tmp, | |
3106 | &client->condition_list, node) { | |
3107 | (void) notification_thread_client_unsubscribe(client, | |
3108 | condition_list_element->condition, state, NULL); | |
3109 | } | |
3110 | ||
3111 | /* | |
3112 | * Client no longer accessible to other threads (through the | |
3113 | * client lists). | |
3114 | */ | |
3115 | notification_client_destroy(client, state); | |
3116 | return ret; | |
3117 | } | |
3118 | ||
3119 | int handle_notification_thread_client_disconnect( | |
3120 | int client_socket, struct notification_thread_state *state) | |
ab0ee2ca JG |
3121 | { |
3122 | int ret = 0; | |
3123 | struct notification_client *client; | |
3124 | ||
3125 | rcu_read_lock(); | |
3126 | DBG("[notification-thread] Closing client connection (socket fd = %i)", | |
3127 | client_socket); | |
3128 | client = get_client_from_socket(client_socket, state); | |
3129 | if (!client) { | |
3130 | /* Internal state corruption, fatal error. */ | |
3131 | ERR("[notification-thread] Unable to find client (socket fd = %i)", | |
3132 | client_socket); | |
3133 | ret = -1; | |
3134 | goto end; | |
3135 | } | |
3136 | ||
1831ae68 | 3137 | ret = notification_thread_client_disconnect(client, state); |
ab0ee2ca JG |
3138 | end: |
3139 | rcu_read_unlock(); | |
3140 | return ret; | |
3141 | } | |
3142 | ||
3143 | int handle_notification_thread_client_disconnect_all( | |
3144 | struct notification_thread_state *state) | |
3145 | { | |
3146 | struct cds_lfht_iter iter; | |
3147 | struct notification_client *client; | |
3148 | bool error_encoutered = false; | |
3149 | ||
3150 | rcu_read_lock(); | |
3151 | DBG("[notification-thread] Closing all client connections"); | |
3152 | cds_lfht_for_each_entry(state->client_socket_ht, &iter, client, | |
1831ae68 | 3153 | client_socket_ht_node) { |
ab0ee2ca JG |
3154 | int ret; |
3155 | ||
1831ae68 FD |
3156 | ret = notification_thread_client_disconnect( |
3157 | client, state); | |
ab0ee2ca JG |
3158 | if (ret) { |
3159 | error_encoutered = true; | |
3160 | } | |
3161 | } | |
3162 | rcu_read_unlock(); | |
3163 | return error_encoutered ? 1 : 0; | |
3164 | } | |
3165 | ||
3166 | int handle_notification_thread_trigger_unregister_all( | |
3167 | struct notification_thread_state *state) | |
3168 | { | |
4149ace8 | 3169 | bool error_occurred = false; |
ab0ee2ca JG |
3170 | struct cds_lfht_iter iter; |
3171 | struct lttng_trigger_ht_element *trigger_ht_element; | |
3172 | ||
763de384 | 3173 | rcu_read_lock(); |
ab0ee2ca JG |
3174 | cds_lfht_for_each_entry(state->triggers_ht, &iter, trigger_ht_element, |
3175 | node) { | |
3176 | int ret = handle_notification_thread_command_unregister_trigger( | |
3177 | state, trigger_ht_element->trigger, NULL); | |
3178 | if (ret) { | |
4149ace8 | 3179 | error_occurred = true; |
ab0ee2ca JG |
3180 | } |
3181 | } | |
763de384 | 3182 | rcu_read_unlock(); |
4149ace8 | 3183 | return error_occurred ? -1 : 0; |
ab0ee2ca JG |
3184 | } |
3185 | ||
3186 | static | |
1831ae68 FD |
3187 | int client_handle_transmission_status( |
3188 | struct notification_client *client, | |
3189 | enum client_transmission_status transmission_status, | |
ab0ee2ca | 3190 | struct notification_thread_state *state) |
1831ae68 FD |
3191 | { |
3192 | int ret = 0; | |
3193 | ||
3194 | ASSERT_LOCKED(client->lock); | |
3195 | ||
3196 | switch (transmission_status) { | |
3197 | case CLIENT_TRANSMISSION_STATUS_COMPLETE: | |
3198 | ret = lttng_poll_mod(&state->events, client->socket, | |
3199 | CLIENT_POLL_MASK_IN); | |
3200 | if (ret) { | |
3201 | goto end; | |
3202 | } | |
3203 | ||
3204 | client->communication.outbound.queued_command_reply = false; | |
3205 | client->communication.outbound.dropped_notification = false; | |
3206 | break; | |
3207 | case CLIENT_TRANSMISSION_STATUS_QUEUED: | |
3208 | /* | |
3209 | * We want to be notified whenever there is buffer space | |
3210 | * available to send the rest of the payload. | |
3211 | */ | |
3212 | ret = lttng_poll_mod(&state->events, client->socket, | |
3213 | CLIENT_POLL_MASK_IN_OUT); | |
3214 | if (ret) { | |
3215 | goto end; | |
3216 | } | |
3217 | break; | |
3218 | case CLIENT_TRANSMISSION_STATUS_FAIL: | |
3219 | ret = notification_thread_client_disconnect(client, state); | |
3220 | if (ret) { | |
3221 | goto end; | |
3222 | } | |
3223 | break; | |
3224 | case CLIENT_TRANSMISSION_STATUS_ERROR: | |
3225 | ret = -1; | |
3226 | goto end; | |
3227 | default: | |
3228 | abort(); | |
3229 | } | |
3230 | end: | |
3231 | return ret; | |
3232 | } | |
3233 | ||
3234 | /* Client lock must be acquired by caller. */ | |
3235 | static | |
3236 | enum client_transmission_status client_flush_outgoing_queue( | |
3237 | struct notification_client *client) | |
ab0ee2ca JG |
3238 | { |
3239 | ssize_t ret; | |
3240 | size_t to_send_count; | |
1831ae68 FD |
3241 | enum client_transmission_status status; |
3242 | ||
3243 | ASSERT_LOCKED(client->lock); | |
ab0ee2ca JG |
3244 | |
3245 | assert(client->communication.outbound.buffer.size != 0); | |
3246 | to_send_count = client->communication.outbound.buffer.size; | |
3247 | DBG("[notification-thread] Flushing client (socket fd = %i) outgoing queue", | |
3248 | client->socket); | |
3249 | ||
3250 | ret = lttcomm_send_unix_sock_non_block(client->socket, | |
3251 | client->communication.outbound.buffer.data, | |
3252 | to_send_count); | |
3253 | if ((ret < 0 && (errno == EAGAIN || errno == EWOULDBLOCK)) || | |
3254 | (ret > 0 && ret < to_send_count)) { | |
3255 | DBG("[notification-thread] Client (socket fd = %i) outgoing queue could not be completely flushed", | |
3256 | client->socket); | |
3257 | to_send_count -= max(ret, 0); | |
3258 | ||
3259 | memcpy(client->communication.outbound.buffer.data, | |
3260 | client->communication.outbound.buffer.data + | |
3261 | client->communication.outbound.buffer.size - to_send_count, | |
3262 | to_send_count); | |
3263 | ret = lttng_dynamic_buffer_set_size( | |
3264 | &client->communication.outbound.buffer, | |
3265 | to_send_count); | |
3266 | if (ret) { | |
3267 | goto error; | |
3268 | } | |
1831ae68 | 3269 | status = CLIENT_TRANSMISSION_STATUS_QUEUED; |
ab0ee2ca JG |
3270 | } else if (ret < 0) { |
3271 | /* Generic error, disconnect the client. */ | |
1831ae68 | 3272 | ERR("[notification-thread] Failed to flush outgoing queue, disconnecting client (socket fd = %i)", |
ab0ee2ca | 3273 | client->socket); |
1831ae68 | 3274 | status = CLIENT_TRANSMISSION_STATUS_FAIL; |
ab0ee2ca JG |
3275 | } else { |
3276 | /* No error and flushed the queue completely. */ | |
3277 | ret = lttng_dynamic_buffer_set_size( | |
3278 | &client->communication.outbound.buffer, 0); | |
3279 | if (ret) { | |
3280 | goto error; | |
3281 | } | |
1831ae68 | 3282 | status = CLIENT_TRANSMISSION_STATUS_COMPLETE; |
ab0ee2ca JG |
3283 | } |
3284 | ||
1831ae68 | 3285 | return status; |
ab0ee2ca | 3286 | error: |
1831ae68 | 3287 | return CLIENT_TRANSMISSION_STATUS_ERROR; |
ab0ee2ca JG |
3288 | } |
3289 | ||
1831ae68 | 3290 | /* Client lock must be acquired by caller. */ |
ab0ee2ca JG |
3291 | static |
3292 | int client_send_command_reply(struct notification_client *client, | |
3293 | struct notification_thread_state *state, | |
3294 | enum lttng_notification_channel_status status) | |
3295 | { | |
3296 | int ret; | |
3297 | struct lttng_notification_channel_command_reply reply = { | |
3298 | .status = (int8_t) status, | |
3299 | }; | |
3300 | struct lttng_notification_channel_message msg = { | |
3301 | .type = (int8_t) LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_COMMAND_REPLY, | |
3302 | .size = sizeof(reply), | |
3303 | }; | |
3304 | char buffer[sizeof(msg) + sizeof(reply)]; | |
1831ae68 FD |
3305 | enum client_transmission_status transmission_status; |
3306 | ||
3307 | ASSERT_LOCKED(client->lock); | |
ab0ee2ca JG |
3308 | |
3309 | if (client->communication.outbound.queued_command_reply) { | |
3310 | /* Protocol error. */ | |
3311 | goto error; | |
3312 | } | |
3313 | ||
3314 | memcpy(buffer, &msg, sizeof(msg)); | |
3315 | memcpy(buffer + sizeof(msg), &reply, sizeof(reply)); | |
3316 | DBG("[notification-thread] Send command reply (%i)", (int) status); | |
3317 | ||
3318 | /* Enqueue buffer to outgoing queue and flush it. */ | |
3319 | ret = lttng_dynamic_buffer_append( | |
3320 | &client->communication.outbound.buffer, | |
3321 | buffer, sizeof(buffer)); | |
3322 | if (ret) { | |
1831ae68 FD |
3323 | goto error; |
3324 | } | |
3325 | ||
3326 | transmission_status = client_flush_outgoing_queue(client); | |
3327 | ret = client_handle_transmission_status( | |
3328 | client, transmission_status, state); | |
3329 | if (ret) { | |
3330 | goto error; | |
3331 | } | |
3332 | ||
3333 | if (client->communication.outbound.buffer.size != 0) { | |
3334 | /* Queue could not be emptied. */ | |
3335 | client->communication.outbound.queued_command_reply = true; | |
3336 | } | |
3337 | ||
3338 | return 0; | |
3339 | error: | |
3340 | return -1; | |
3341 | } | |
3342 | ||
3343 | static | |
3344 | int client_handle_message_unknown(struct notification_client *client, | |
3345 | struct notification_thread_state *state) | |
3346 | { | |
3347 | int ret; | |
3348 | ||
3349 | pthread_mutex_lock(&client->lock); | |
3350 | ||
3351 | /* | |
3352 | * Receiving message header. The function will be called again | |
3353 | * once the rest of the message as been received and can be | |
3354 | * interpreted. | |
3355 | */ | |
3356 | const struct lttng_notification_channel_message *msg; | |
3357 | ||
3358 | assert(sizeof(*msg) == client->communication.inbound.buffer.size); | |
3359 | msg = (const struct lttng_notification_channel_message *) | |
3360 | client->communication.inbound.buffer.data; | |
3361 | ||
3362 | if (msg->size == 0 || | |
3363 | msg->size > DEFAULT_MAX_NOTIFICATION_CLIENT_MESSAGE_PAYLOAD_SIZE) { | |
3364 | ERR("[notification-thread] Invalid notification channel message: length = %u", | |
3365 | msg->size); | |
3366 | ret = -1; | |
3367 | goto end; | |
3368 | } | |
3369 | ||
3370 | switch (msg->type) { | |
3371 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_SUBSCRIBE: | |
3372 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_UNSUBSCRIBE: | |
3373 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_HANDSHAKE: | |
3374 | break; | |
3375 | default: | |
3376 | ret = -1; | |
3377 | ERR("[notification-thread] Invalid notification channel message: unexpected message type"); | |
3378 | goto end; | |
3379 | } | |
3380 | ||
3381 | client->communication.inbound.bytes_to_receive = msg->size; | |
3382 | client->communication.inbound.msg_type = | |
3383 | (enum lttng_notification_channel_message_type) msg->type; | |
3384 | ret = lttng_dynamic_buffer_set_size( | |
3385 | &client->communication.inbound.buffer, msg->size); | |
3386 | end: | |
3387 | pthread_mutex_unlock(&client->lock); | |
3388 | return ret; | |
3389 | } | |
3390 | ||
3391 | static | |
3392 | int client_handle_message_handshake(struct notification_client *client, | |
3393 | struct notification_thread_state *state) | |
3394 | { | |
3395 | int ret; | |
3396 | struct lttng_notification_channel_command_handshake *handshake_client; | |
3397 | const struct lttng_notification_channel_command_handshake handshake_reply = { | |
3398 | .major = LTTNG_NOTIFICATION_CHANNEL_VERSION_MAJOR, | |
3399 | .minor = LTTNG_NOTIFICATION_CHANNEL_VERSION_MINOR, | |
3400 | }; | |
3401 | const struct lttng_notification_channel_message msg_header = { | |
3402 | .type = LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_HANDSHAKE, | |
3403 | .size = sizeof(handshake_reply), | |
3404 | }; | |
3405 | enum lttng_notification_channel_status status = | |
3406 | LTTNG_NOTIFICATION_CHANNEL_STATUS_OK; | |
3407 | char send_buffer[sizeof(msg_header) + sizeof(handshake_reply)]; | |
3408 | enum client_transmission_status transmission_status; | |
3409 | ||
3410 | pthread_mutex_lock(&client->lock); | |
3411 | ||
3412 | memcpy(send_buffer, &msg_header, sizeof(msg_header)); | |
3413 | memcpy(send_buffer + sizeof(msg_header), &handshake_reply, | |
3414 | sizeof(handshake_reply)); | |
3415 | ||
3416 | handshake_client = | |
3417 | (struct lttng_notification_channel_command_handshake *) | |
3418 | client->communication.inbound.buffer | |
3419 | .data; | |
3420 | client->major = handshake_client->major; | |
3421 | client->minor = handshake_client->minor; | |
3422 | if (!client->communication.inbound.creds_received) { | |
3423 | ERR("[notification-thread] No credentials received from client"); | |
3424 | ret = -1; | |
3425 | goto end; | |
3426 | } | |
3427 | ||
3428 | client->uid = LTTNG_SOCK_GET_UID_CRED( | |
3429 | &client->communication.inbound.creds); | |
3430 | client->gid = LTTNG_SOCK_GET_GID_CRED( | |
3431 | &client->communication.inbound.creds); | |
3432 | DBG("[notification-thread] Received handshake from client (uid = %u, gid = %u) with version %i.%i", | |
3433 | client->uid, client->gid, (int) client->major, | |
3434 | (int) client->minor); | |
3435 | ||
3436 | if (handshake_client->major != | |
3437 | LTTNG_NOTIFICATION_CHANNEL_VERSION_MAJOR) { | |
3438 | status = LTTNG_NOTIFICATION_CHANNEL_STATUS_UNSUPPORTED_VERSION; | |
3439 | } | |
3440 | ||
3441 | ret = lttng_dynamic_buffer_append( | |
3442 | &client->communication.outbound.buffer, send_buffer, | |
3443 | sizeof(send_buffer)); | |
3444 | if (ret) { | |
3445 | ERR("[notification-thread] Failed to send protocol version to notification channel client"); | |
3446 | goto end; | |
3447 | } | |
3448 | ||
3449 | transmission_status = client_flush_outgoing_queue(client); | |
3450 | ret = client_handle_transmission_status( | |
3451 | client, transmission_status, state); | |
3452 | if (ret) { | |
3453 | goto end; | |
3454 | } | |
3455 | ||
3456 | ret = client_send_command_reply(client, state, status); | |
3457 | if (ret) { | |
3458 | ERR("[notification-thread] Failed to send reply to notification channel client"); | |
3459 | goto end; | |
3460 | } | |
3461 | ||
3462 | /* Set reception state to receive the next message header. */ | |
3463 | ret = client_reset_inbound_state(client); | |
3464 | if (ret) { | |
3465 | ERR("[notification-thread] Failed to reset client communication's inbound state"); | |
3466 | goto end; | |
3467 | } | |
3468 | client->validated = true; | |
3469 | client->communication.active = true; | |
3470 | ||
3471 | end: | |
3472 | pthread_mutex_unlock(&client->lock); | |
3473 | return ret; | |
3474 | } | |
3475 | ||
3476 | static | |
3477 | int client_handle_message_subscription( | |
3478 | struct notification_client *client, | |
3479 | enum lttng_notification_channel_message_type msg_type, | |
3480 | struct notification_thread_state *state) | |
3481 | { | |
3482 | int ret; | |
3483 | struct lttng_condition *condition; | |
3484 | enum lttng_notification_channel_status status = | |
3485 | LTTNG_NOTIFICATION_CHANNEL_STATUS_OK; | |
3486 | const struct lttng_buffer_view condition_view = | |
3487 | lttng_buffer_view_from_dynamic_buffer( | |
3488 | &client->communication.inbound.buffer, | |
3489 | 0, -1); | |
3490 | size_t expected_condition_size; | |
3491 | ||
3492 | pthread_mutex_lock(&client->lock); | |
3493 | expected_condition_size = client->communication.inbound.buffer.size; | |
3494 | pthread_mutex_unlock(&client->lock); | |
3495 | ||
3496 | ret = lttng_condition_create_from_buffer(&condition_view, &condition); | |
3497 | if (ret != expected_condition_size) { | |
3498 | ERR("[notification-thread] Malformed condition received from client"); | |
3499 | goto end; | |
3500 | } | |
3501 | ||
3502 | if (msg_type == LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_SUBSCRIBE) { | |
3503 | ret = notification_thread_client_subscribe( | |
3504 | client, condition, state, &status); | |
3505 | } else { | |
3506 | ret = notification_thread_client_unsubscribe( | |
3507 | client, condition, state, &status); | |
3508 | } | |
3509 | if (ret) { | |
3510 | goto end; | |
ab0ee2ca JG |
3511 | } |
3512 | ||
1831ae68 FD |
3513 | pthread_mutex_lock(&client->lock); |
3514 | ret = client_send_command_reply(client, state, status); | |
ab0ee2ca | 3515 | if (ret) { |
1831ae68 FD |
3516 | ERR("[notification-thread] Failed to send reply to notification channel client"); |
3517 | goto end_unlock; | |
ab0ee2ca JG |
3518 | } |
3519 | ||
1831ae68 FD |
3520 | /* Set reception state to receive the next message header. */ |
3521 | ret = client_reset_inbound_state(client); | |
3522 | if (ret) { | |
3523 | ERR("[notification-thread] Failed to reset client communication's inbound state"); | |
3524 | goto end_unlock; | |
ab0ee2ca JG |
3525 | } |
3526 | ||
1831ae68 FD |
3527 | end_unlock: |
3528 | pthread_mutex_unlock(&client->lock); | |
3529 | end: | |
3530 | return ret; | |
ab0ee2ca JG |
3531 | } |
3532 | ||
3533 | static | |
3534 | int client_dispatch_message(struct notification_client *client, | |
3535 | struct notification_thread_state *state) | |
3536 | { | |
3537 | int ret = 0; | |
3538 | ||
3539 | if (client->communication.inbound.msg_type != | |
3540 | LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_HANDSHAKE && | |
3541 | client->communication.inbound.msg_type != | |
3542 | LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_UNKNOWN && | |
3543 | !client->validated) { | |
3544 | WARN("[notification-thread] client attempted a command before handshake"); | |
3545 | ret = -1; | |
3546 | goto end; | |
3547 | } | |
3548 | ||
3549 | switch (client->communication.inbound.msg_type) { | |
3550 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_UNKNOWN: | |
3551 | { | |
1831ae68 | 3552 | ret = client_handle_message_unknown(client, state); |
ab0ee2ca JG |
3553 | break; |
3554 | } | |
3555 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_HANDSHAKE: | |
3556 | { | |
1831ae68 | 3557 | ret = client_handle_message_handshake(client, state); |
ab0ee2ca JG |
3558 | break; |
3559 | } | |
3560 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_SUBSCRIBE: | |
3561 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_UNSUBSCRIBE: | |
3562 | { | |
1831ae68 FD |
3563 | ret = client_handle_message_subscription(client, |
3564 | client->communication.inbound.msg_type, state); | |
ab0ee2ca JG |
3565 | break; |
3566 | } | |
3567 | default: | |
3568 | abort(); | |
3569 | } | |
3570 | end: | |
3571 | return ret; | |
3572 | } | |
3573 | ||
3574 | /* Incoming data from client. */ | |
3575 | int handle_notification_thread_client_in( | |
3576 | struct notification_thread_state *state, int socket) | |
3577 | { | |
14fa22f8 | 3578 | int ret = 0; |
ab0ee2ca JG |
3579 | struct notification_client *client; |
3580 | ssize_t recv_ret; | |
3581 | size_t offset; | |
1831ae68 | 3582 | bool message_is_complete = false; |
ab0ee2ca JG |
3583 | |
3584 | client = get_client_from_socket(socket, state); | |
3585 | if (!client) { | |
3586 | /* Internal error, abort. */ | |
3587 | ret = -1; | |
3588 | goto end; | |
3589 | } | |
3590 | ||
1831ae68 | 3591 | pthread_mutex_lock(&client->lock); |
14fa22f8 JG |
3592 | offset = client->communication.inbound.buffer.size - |
3593 | client->communication.inbound.bytes_to_receive; | |
01ea340e | 3594 | if (client->communication.inbound.expect_creds) { |
ab0ee2ca JG |
3595 | recv_ret = lttcomm_recv_creds_unix_sock(socket, |
3596 | client->communication.inbound.buffer.data + offset, | |
3597 | client->communication.inbound.bytes_to_receive, | |
3598 | &client->communication.inbound.creds); | |
3599 | if (recv_ret > 0) { | |
01ea340e | 3600 | client->communication.inbound.expect_creds = false; |
ab0ee2ca JG |
3601 | client->communication.inbound.creds_received = true; |
3602 | } | |
3603 | } else { | |
3604 | recv_ret = lttcomm_recv_unix_sock_non_block(socket, | |
3605 | client->communication.inbound.buffer.data + offset, | |
3606 | client->communication.inbound.bytes_to_receive); | |
3607 | } | |
1831ae68 FD |
3608 | if (recv_ret >= 0) { |
3609 | client->communication.inbound.bytes_to_receive -= recv_ret; | |
3610 | message_is_complete = client->communication.inbound | |
3611 | .bytes_to_receive == 0; | |
3612 | } | |
3613 | pthread_mutex_unlock(&client->lock); | |
ab0ee2ca JG |
3614 | if (recv_ret < 0) { |
3615 | goto error_disconnect_client; | |
3616 | } | |
3617 | ||
1831ae68 | 3618 | if (message_is_complete) { |
ab0ee2ca JG |
3619 | ret = client_dispatch_message(client, state); |
3620 | if (ret) { | |
3621 | /* | |
3622 | * Only returns an error if this client must be | |
3623 | * disconnected. | |
3624 | */ | |
3625 | goto error_disconnect_client; | |
3626 | } | |
ab0ee2ca JG |
3627 | } |
3628 | end: | |
3629 | return ret; | |
3630 | error_disconnect_client: | |
1831ae68 | 3631 | ret = notification_thread_client_disconnect(client, state); |
ab0ee2ca JG |
3632 | return ret; |
3633 | } | |
3634 | ||
3635 | /* Client ready to receive outgoing data. */ | |
3636 | int handle_notification_thread_client_out( | |
3637 | struct notification_thread_state *state, int socket) | |
3638 | { | |
3639 | int ret; | |
3640 | struct notification_client *client; | |
1831ae68 | 3641 | enum client_transmission_status transmission_status; |
ab0ee2ca JG |
3642 | |
3643 | client = get_client_from_socket(socket, state); | |
3644 | if (!client) { | |
3645 | /* Internal error, abort. */ | |
3646 | ret = -1; | |
3647 | goto end; | |
3648 | } | |
3649 | ||
1831ae68 FD |
3650 | pthread_mutex_lock(&client->lock); |
3651 | transmission_status = client_flush_outgoing_queue(client); | |
3652 | ret = client_handle_transmission_status( | |
3653 | client, transmission_status, state); | |
3654 | pthread_mutex_unlock(&client->lock); | |
ab0ee2ca JG |
3655 | if (ret) { |
3656 | goto end; | |
3657 | } | |
3658 | end: | |
3659 | return ret; | |
3660 | } | |
3661 | ||
3662 | static | |
e8360425 JD |
3663 | bool evaluate_buffer_usage_condition(const struct lttng_condition *condition, |
3664 | const struct channel_state_sample *sample, | |
3665 | uint64_t buffer_capacity) | |
ab0ee2ca JG |
3666 | { |
3667 | bool result = false; | |
3668 | uint64_t threshold; | |
3669 | enum lttng_condition_type condition_type; | |
e8360425 | 3670 | const struct lttng_condition_buffer_usage *use_condition = container_of( |
ab0ee2ca JG |
3671 | condition, struct lttng_condition_buffer_usage, |
3672 | parent); | |
3673 | ||
ab0ee2ca JG |
3674 | if (use_condition->threshold_bytes.set) { |
3675 | threshold = use_condition->threshold_bytes.value; | |
3676 | } else { | |
3677 | /* | |
3678 | * Threshold was expressed as a ratio. | |
3679 | * | |
3680 | * TODO the threshold (in bytes) of conditions expressed | |
3681 | * as a ratio of total buffer size could be cached to | |
3682 | * forego this double-multiplication or it could be performed | |
3683 | * as fixed-point math. | |
3684 | * | |
3685 | * Note that caching should accomodate the case where the | |
3686 | * condition applies to multiple channels (i.e. don't assume | |
3687 | * that all channels matching my_chann* have the same size...) | |
3688 | */ | |
3689 | threshold = (uint64_t) (use_condition->threshold_ratio.value * | |
3690 | (double) buffer_capacity); | |
3691 | } | |
3692 | ||
3693 | condition_type = lttng_condition_get_type(condition); | |
3694 | if (condition_type == LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW) { | |
3695 | DBG("[notification-thread] Low buffer usage condition being evaluated: threshold = %" PRIu64 ", highest usage = %" PRIu64, | |
3696 | threshold, sample->highest_usage); | |
3697 | ||
3698 | /* | |
3699 | * The low condition should only be triggered once _all_ of the | |
3700 | * streams in a channel have gone below the "low" threshold. | |
3701 | */ | |
3702 | if (sample->highest_usage <= threshold) { | |
3703 | result = true; | |
3704 | } | |
3705 | } else { | |
3706 | DBG("[notification-thread] High buffer usage condition being evaluated: threshold = %" PRIu64 ", highest usage = %" PRIu64, | |
3707 | threshold, sample->highest_usage); | |
3708 | ||
3709 | /* | |
3710 | * For high buffer usage scenarios, we want to trigger whenever | |
3711 | * _any_ of the streams has reached the "high" threshold. | |
3712 | */ | |
3713 | if (sample->highest_usage >= threshold) { | |
3714 | result = true; | |
3715 | } | |
3716 | } | |
e8360425 | 3717 | |
ab0ee2ca JG |
3718 | return result; |
3719 | } | |
3720 | ||
3721 | static | |
e8360425 JD |
3722 | bool evaluate_session_consumed_size_condition( |
3723 | const struct lttng_condition *condition, | |
3724 | uint64_t session_consumed_size) | |
3725 | { | |
3726 | uint64_t threshold; | |
3727 | const struct lttng_condition_session_consumed_size *size_condition = | |
3728 | container_of(condition, | |
3729 | struct lttng_condition_session_consumed_size, | |
3730 | parent); | |
3731 | ||
3732 | threshold = size_condition->consumed_threshold_bytes.value; | |
3733 | DBG("[notification-thread] Session consumed size condition being evaluated: threshold = %" PRIu64 ", current size = %" PRIu64, | |
3734 | threshold, session_consumed_size); | |
3735 | return session_consumed_size >= threshold; | |
3736 | } | |
3737 | ||
3738 | static | |
ed327204 | 3739 | int evaluate_buffer_condition(const struct lttng_condition *condition, |
ab0ee2ca | 3740 | struct lttng_evaluation **evaluation, |
e8360425 JD |
3741 | const struct notification_thread_state *state, |
3742 | const struct channel_state_sample *previous_sample, | |
3743 | const struct channel_state_sample *latest_sample, | |
3744 | uint64_t previous_session_consumed_total, | |
3745 | uint64_t latest_session_consumed_total, | |
3746 | struct channel_info *channel_info) | |
ab0ee2ca JG |
3747 | { |
3748 | int ret = 0; | |
3749 | enum lttng_condition_type condition_type; | |
e8360425 JD |
3750 | const bool previous_sample_available = !!previous_sample; |
3751 | bool previous_sample_result = false; | |
ab0ee2ca JG |
3752 | bool latest_sample_result; |
3753 | ||
3754 | condition_type = lttng_condition_get_type(condition); | |
ab0ee2ca | 3755 | |
e8360425 JD |
3756 | switch (condition_type) { |
3757 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
3758 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
3759 | if (caa_likely(previous_sample_available)) { | |
3760 | previous_sample_result = | |
3761 | evaluate_buffer_usage_condition(condition, | |
3762 | previous_sample, channel_info->capacity); | |
3763 | } | |
3764 | latest_sample_result = evaluate_buffer_usage_condition( | |
3765 | condition, latest_sample, | |
3766 | channel_info->capacity); | |
3767 | break; | |
3768 | case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE: | |
3769 | if (caa_likely(previous_sample_available)) { | |
3770 | previous_sample_result = | |
3771 | evaluate_session_consumed_size_condition( | |
3772 | condition, | |
3773 | previous_session_consumed_total); | |
3774 | } | |
3775 | latest_sample_result = | |
3776 | evaluate_session_consumed_size_condition( | |
3777 | condition, | |
3778 | latest_session_consumed_total); | |
3779 | break; | |
3780 | default: | |
3781 | /* Unknown condition type; internal error. */ | |
3782 | abort(); | |
3783 | } | |
ab0ee2ca JG |
3784 | |
3785 | if (!latest_sample_result || | |
3786 | (previous_sample_result == latest_sample_result)) { | |
3787 | /* | |
3788 | * Only trigger on a condition evaluation transition. | |
3789 | * | |
3790 | * NOTE: This edge-triggered logic may not be appropriate for | |
3791 | * future condition types. | |
3792 | */ | |
3793 | goto end; | |
3794 | } | |
3795 | ||
e8360425 JD |
3796 | if (!evaluation || !latest_sample_result) { |
3797 | goto end; | |
3798 | } | |
3799 | ||
3800 | switch (condition_type) { | |
3801 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
3802 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
ab0ee2ca JG |
3803 | *evaluation = lttng_evaluation_buffer_usage_create( |
3804 | condition_type, | |
3805 | latest_sample->highest_usage, | |
e8360425 JD |
3806 | channel_info->capacity); |
3807 | break; | |
3808 | case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE: | |
3809 | *evaluation = lttng_evaluation_session_consumed_size_create( | |
e8360425 JD |
3810 | latest_session_consumed_total); |
3811 | break; | |
3812 | default: | |
3813 | abort(); | |
3814 | } | |
3815 | ||
3816 | if (!*evaluation) { | |
3817 | ret = -1; | |
3818 | goto end; | |
ab0ee2ca JG |
3819 | } |
3820 | end: | |
3821 | return ret; | |
3822 | } | |
3823 | ||
3824 | static | |
1831ae68 | 3825 | int client_notification_overflow(struct notification_client *client) |
ab0ee2ca | 3826 | { |
1831ae68 FD |
3827 | int ret = 0; |
3828 | const struct lttng_notification_channel_message msg = { | |
ab0ee2ca | 3829 | .type = (int8_t) LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_NOTIFICATION_DROPPED, |
ab0ee2ca JG |
3830 | }; |
3831 | ||
1831ae68 FD |
3832 | ASSERT_LOCKED(client->lock); |
3833 | ||
3834 | DBG("Dropping notification addressed to client (socket fd = %i)", | |
3835 | client->socket); | |
3836 | if (client->communication.outbound.dropped_notification) { | |
3837 | /* | |
3838 | * The client already has a "notification dropped" message | |
3839 | * in its outgoing queue. Nothing to do since all | |
3840 | * of those messages are coalesced. | |
3841 | */ | |
3842 | goto end; | |
3843 | } | |
3844 | ||
3845 | client->communication.outbound.dropped_notification = true; | |
ab0ee2ca JG |
3846 | ret = lttng_dynamic_buffer_append( |
3847 | &client->communication.outbound.buffer, &msg, | |
3848 | sizeof(msg)); | |
1831ae68 FD |
3849 | if (ret) { |
3850 | PERROR("Failed to enqueue \"dropped notification\" message in client's (socket fd = %i) outgoing queue", | |
3851 | client->socket); | |
3852 | } | |
3853 | end: | |
ab0ee2ca JG |
3854 | return ret; |
3855 | } | |
3856 | ||
1831ae68 FD |
3857 | static int client_handle_transmission_status_wrapper( |
3858 | struct notification_client *client, | |
3859 | enum client_transmission_status status, | |
3860 | void *user_data) | |
3861 | { | |
3862 | return client_handle_transmission_status(client, status, | |
3863 | (struct notification_thread_state *) user_data); | |
3864 | } | |
3865 | ||
ab0ee2ca | 3866 | static |
9b63a4aa JG |
3867 | int send_evaluation_to_clients(const struct lttng_trigger *trigger, |
3868 | const struct lttng_evaluation *evaluation, | |
ab0ee2ca JG |
3869 | struct notification_client_list* client_list, |
3870 | struct notification_thread_state *state, | |
1831ae68 FD |
3871 | uid_t object_uid, gid_t object_gid) |
3872 | { | |
3873 | return notification_client_list_send_evaluation(client_list, | |
3874 | lttng_trigger_get_const_condition(trigger), evaluation, | |
3875 | lttng_trigger_get_credentials(trigger), | |
3876 | &(struct lttng_credentials){ | |
3877 | .uid = object_uid, .gid = object_gid}, | |
3878 | client_handle_transmission_status_wrapper, state); | |
3879 | } | |
3880 | ||
3881 | LTTNG_HIDDEN | |
3882 | int notification_client_list_send_evaluation( | |
3883 | struct notification_client_list *client_list, | |
3884 | const struct lttng_condition *condition, | |
3885 | const struct lttng_evaluation *evaluation, | |
3886 | const struct lttng_credentials *trigger_creds, | |
3887 | const struct lttng_credentials *source_object_creds, | |
3888 | report_client_transmission_result_cb client_report, | |
3889 | void *user_data) | |
ab0ee2ca JG |
3890 | { |
3891 | int ret = 0; | |
3892 | struct lttng_dynamic_buffer msg_buffer; | |
3893 | struct notification_client_list_element *client_list_element, *tmp; | |
9b63a4aa | 3894 | const struct lttng_notification notification = { |
1831ae68 | 3895 | .condition = (struct lttng_condition *) condition, |
9b63a4aa JG |
3896 | .evaluation = (struct lttng_evaluation *) evaluation, |
3897 | }; | |
3647288f JG |
3898 | struct lttng_notification_channel_message msg_header = { |
3899 | .type = (int8_t) LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_NOTIFICATION, | |
3900 | }; | |
ab0ee2ca JG |
3901 | |
3902 | lttng_dynamic_buffer_init(&msg_buffer); | |
3903 | ||
3647288f JG |
3904 | ret = lttng_dynamic_buffer_append(&msg_buffer, &msg_header, |
3905 | sizeof(msg_header)); | |
ab0ee2ca JG |
3906 | if (ret) { |
3907 | goto end; | |
3908 | } | |
3909 | ||
9b63a4aa | 3910 | ret = lttng_notification_serialize(¬ification, &msg_buffer); |
ab0ee2ca | 3911 | if (ret) { |
ab0ee2ca JG |
3912 | ERR("[notification-thread] Failed to serialize notification"); |
3913 | ret = -1; | |
3914 | goto end; | |
3915 | } | |
3916 | ||
3647288f JG |
3917 | /* Update payload size. */ |
3918 | ((struct lttng_notification_channel_message * ) msg_buffer.data)->size = | |
3919 | (uint32_t) (msg_buffer.size - sizeof(msg_header)); | |
3920 | ||
1831ae68 | 3921 | pthread_mutex_lock(&client_list->lock); |
ab0ee2ca JG |
3922 | cds_list_for_each_entry_safe(client_list_element, tmp, |
3923 | &client_list->list, node) { | |
1831ae68 | 3924 | enum client_transmission_status transmission_status; |
ab0ee2ca JG |
3925 | struct notification_client *client = |
3926 | client_list_element->client; | |
3927 | ||
1831ae68 FD |
3928 | ret = 0; |
3929 | pthread_mutex_lock(&client->lock); | |
3930 | if (source_object_creds) { | |
3931 | if (client->uid != source_object_creds->uid && | |
3932 | client->gid != source_object_creds->gid && | |
3933 | client->uid != 0) { | |
3934 | /* | |
3935 | * Client is not allowed to monitor this | |
3936 | * object. | |
3937 | */ | |
3938 | DBG("[notification-thread] Skipping client at it does not have the object permission to receive notification for this trigger"); | |
3939 | goto unlock_client; | |
3940 | } | |
3941 | } | |
3942 | ||
3943 | /* TODO: what is the behavior for root client on non root | |
3944 | * trigger? Since multiple triggers (different user) can have the same condition | |
3945 | * but with different action group that can have each a notify. | |
3946 | * Does the root client receive multiple notification for all | |
3947 | * those triggers with the same condition or only notification | |
3948 | * for triggers the root user configured? | |
3949 | * For now we do the later. All users including the root user | |
3950 | * can only receive notification from trigger it registered. | |
3951 | */ | |
3952 | if (client->uid != trigger_creds->uid && client->gid != trigger_creds->gid) { | |
3953 | DBG("[notification-thread] Skipping client at it does not have the permission to receive notification for this trigger"); | |
3954 | goto unlock_client; | |
ab0ee2ca JG |
3955 | } |
3956 | ||
3957 | DBG("[notification-thread] Sending notification to client (fd = %i, %zu bytes)", | |
3958 | client->socket, msg_buffer.size); | |
3959 | if (client->communication.outbound.buffer.size) { | |
3960 | /* | |
3961 | * Outgoing data is already buffered for this client; | |
3962 | * drop the notification and enqueue a "dropped | |
3963 | * notification" message if this is the first dropped | |
3964 | * notification since the socket spilled-over to the | |
3965 | * queue. | |
3966 | */ | |
1831ae68 FD |
3967 | ret = client_notification_overflow(client); |
3968 | if (ret) { | |
3969 | goto unlock_client; | |
ab0ee2ca | 3970 | } |
ab0ee2ca JG |
3971 | } |
3972 | ||
3973 | ret = lttng_dynamic_buffer_append_buffer( | |
3974 | &client->communication.outbound.buffer, | |
3975 | &msg_buffer); | |
3976 | if (ret) { | |
1831ae68 | 3977 | goto unlock_client; |
ab0ee2ca JG |
3978 | } |
3979 | ||
1831ae68 FD |
3980 | transmission_status = client_flush_outgoing_queue(client); |
3981 | ret = client_report(client, transmission_status, user_data); | |
ab0ee2ca | 3982 | if (ret) { |
1831ae68 FD |
3983 | goto unlock_client; |
3984 | } | |
3985 | unlock_client: | |
3986 | pthread_mutex_unlock(&client->lock); | |
3987 | if (ret) { | |
3988 | goto end_unlock_list; | |
ab0ee2ca JG |
3989 | } |
3990 | } | |
3991 | ret = 0; | |
1831ae68 FD |
3992 | |
3993 | end_unlock_list: | |
3994 | pthread_mutex_unlock(&client_list->lock); | |
ab0ee2ca | 3995 | end: |
ab0ee2ca JG |
3996 | lttng_dynamic_buffer_reset(&msg_buffer); |
3997 | return ret; | |
3998 | } | |
3999 | ||
1831ae68 FD |
4000 | int perform_event_action_notify(struct notification_thread_state *state, |
4001 | const struct lttng_trigger *trigger, | |
4002 | const struct lttng_trigger_notification *notification, | |
4003 | const struct lttng_action *action) | |
4004 | { | |
4005 | int ret; | |
4006 | struct notification_client_list *client_list; | |
4007 | struct lttng_evaluation *evaluation = NULL; | |
4008 | const struct lttng_credentials *creds = lttng_trigger_get_credentials(trigger); | |
4009 | ||
4010 | /* | |
4011 | * Check if any client is subscribed to the result of this | |
4012 | * evaluation. | |
4013 | */ | |
4014 | client_list = get_client_list_from_condition(state, trigger->condition); | |
4015 | assert(client_list); | |
4016 | if (cds_list_empty(&client_list->list)) { | |
4017 | ret = 0; | |
4018 | goto end; | |
4019 | } | |
4020 | ||
4021 | evaluation = lttng_evaluation_event_rule_create(trigger->name); | |
4022 | if (!evaluation) { | |
4023 | ERR("Failed to create event rule hit evaluation"); | |
4024 | ret = -1; | |
4025 | goto end; | |
4026 | } | |
4027 | ||
4028 | /* Dispatch evaluation result to all clients. | |
4029 | * Note that here the passed credentials are the one from the trigger, | |
4030 | * this is because there is no internal object binded to the trigger per | |
4031 | * see and the credential validation is done at the registration level | |
4032 | * for the event rule based trigger. For a channel the credential | |
4033 | * validation can only be done on notify since the trigger can be | |
4034 | * registered before the channel/session creation. | |
4035 | */ | |
4036 | ret = send_evaluation_to_clients(trigger, | |
4037 | evaluation, client_list, state, | |
4038 | creds->uid, | |
4039 | creds->gid); | |
4040 | lttng_evaluation_destroy(evaluation); | |
4041 | if (caa_unlikely(ret)) { | |
4042 | goto end; | |
4043 | } | |
4044 | end: | |
4045 | return ret; | |
4046 | ||
4047 | } | |
4048 | ||
4049 | /* This can be called recursively, pass NULL for action on the first iteration */ | |
4050 | int perform_event_action(struct notification_thread_state *state, | |
4051 | const struct lttng_trigger *trigger, | |
4052 | const struct lttng_trigger_notification *notification, | |
4053 | const struct lttng_action *action) | |
4054 | { | |
4055 | int ret = 0; | |
4056 | enum lttng_action_type action_type; | |
4057 | ||
4058 | assert(trigger); | |
4059 | ||
4060 | if (!action) { | |
4061 | action = lttng_trigger_get_const_action(trigger); | |
4062 | } | |
4063 | ||
4064 | action_type = lttng_action_get_type_const(action); | |
4065 | DBG("Handling action %s for trigger id %s (%" PRIu64 ")", | |
4066 | lttng_action_type_string(action_type), trigger->name, | |
4067 | trigger->key.value); | |
4068 | ||
4069 | switch (action_type) { | |
4070 | case LTTNG_ACTION_TYPE_GROUP: | |
4071 | { | |
4072 | /* Recurse into the group */ | |
4073 | const struct lttng_action *tmp = NULL; | |
4074 | unsigned int count = 0; | |
4075 | (void) lttng_action_group_get_count(action, &count); | |
4076 | for (int i = 0; i < count; i++) { | |
4077 | tmp = lttng_action_group_get_at_index_const(action, i); | |
4078 | assert(tmp); | |
4079 | ret = perform_event_action(state, trigger, notification, tmp); | |
4080 | if (ret < 0) { | |
4081 | goto end; | |
4082 | } | |
4083 | } | |
4084 | break; | |
4085 | } | |
4086 | case LTTNG_ACTION_TYPE_NOTIFY: | |
4087 | { | |
4088 | ret = perform_event_action_notify(state, trigger, notification, action); | |
4089 | break; | |
4090 | } | |
4091 | default: | |
4092 | break; | |
4093 | } | |
4094 | end: | |
4095 | return ret; | |
4096 | } | |
4097 | ||
4098 | int handle_notification_thread_event(struct notification_thread_state *state, | |
4099 | int pipe, | |
4100 | enum lttng_domain_type domain) | |
4101 | { | |
4102 | int ret; | |
4103 | struct lttng_ust_trigger_notification ust_notification; | |
4104 | uint64_t kernel_notification; | |
4105 | struct cds_lfht_node *node; | |
4106 | struct cds_lfht_iter iter; | |
4107 | struct notification_trigger_tokens_ht_element *element; | |
4108 | struct lttng_trigger_notification notification; | |
4109 | void *reception_buffer; | |
4110 | size_t reception_size; | |
4111 | enum action_executor_status executor_status; | |
4112 | struct notification_client_list *client_list = NULL; | |
4113 | ||
4114 | notification.type = domain; | |
4115 | ||
4116 | switch(domain) { | |
4117 | case LTTNG_DOMAIN_UST: | |
4118 | reception_buffer = (void *) &ust_notification; | |
4119 | reception_size = sizeof(ust_notification); | |
4120 | notification.u.ust = &ust_notification; | |
4121 | break; | |
4122 | case LTTNG_DOMAIN_KERNEL: | |
4123 | reception_buffer = (void *) &kernel_notification; | |
4124 | reception_size = sizeof(kernel_notification); | |
4125 | notification.u.kernel = &kernel_notification; | |
4126 | break; | |
4127 | default: | |
4128 | assert(0); | |
4129 | } | |
4130 | ||
4131 | /* | |
4132 | * The monitoring pipe only holds messages smaller than PIPE_BUF, | |
4133 | * ensuring that read/write of sampling messages are atomic. | |
4134 | */ | |
4135 | /* TODO: should we read as much as we can ? EWOULDBLOCK? */ | |
4136 | ||
4137 | ret = lttng_read(pipe, reception_buffer, reception_size); | |
4138 | if (ret != reception_size) { | |
4139 | ERR("[notification-thread] Failed to read from event source pipe (fd = %i)", | |
4140 | pipe); | |
4141 | /* TODO: Should this error out completly. | |
4142 | * This can happen when an app is killed as of today | |
4143 | * ret = -1 cause the whole thread to die and fuck up | |
4144 | * everything. | |
4145 | */ | |
4146 | goto end; | |
4147 | } | |
4148 | ||
4149 | switch(domain) { | |
4150 | case LTTNG_DOMAIN_UST: | |
4151 | notification.id = ust_notification.id; | |
4152 | break; | |
4153 | case LTTNG_DOMAIN_KERNEL: | |
4154 | notification.id = kernel_notification; | |
4155 | break; | |
4156 | default: | |
4157 | assert(0); | |
4158 | } | |
4159 | ||
4160 | /* Find triggers associated with this token. */ | |
4161 | rcu_read_lock(); | |
4162 | cds_lfht_lookup(state->trigger_tokens_ht, | |
4163 | hash_key_u64(¬ification.id, lttng_ht_seed), match_trigger_token, | |
4164 | ¬ification.id, &iter); | |
4165 | node = cds_lfht_iter_get_node(&iter); | |
4166 | if (caa_unlikely(!node)) { | |
4167 | /* TODO: is this an error? This might happen if the receive side | |
4168 | * is slow to process event from source and that the trigger was | |
4169 | * removed but the app still kicking. This yield another | |
4170 | * question on the trigger lifetime and when we can remove a | |
4171 | * trigger. How to guarantee that all event with the token idea | |
4172 | * have be processed? Do we want to provide this guarantee? | |
4173 | * | |
4174 | * Update: I have encountered this when using a trigger on | |
4175 | * sched_switch and then removing it. The frequency is quite | |
4176 | * high hence we en up exactly in the mentionned scenario. | |
4177 | * AFAIK this might be the best way to handle this. | |
4178 | */ | |
4179 | ret = 0; | |
4180 | goto end_unlock; | |
4181 | } | |
4182 | element = caa_container_of(node, | |
4183 | struct notification_trigger_tokens_ht_element, | |
4184 | node); | |
4185 | ||
4186 | if (!lttng_trigger_is_ready_to_fire(element->trigger)) { | |
4187 | ret = 0; | |
4188 | goto end_unlock; | |
4189 | } | |
4190 | ||
4191 | client_list = get_client_list_from_condition(state, | |
4192 | lttng_trigger_get_const_condition(element->trigger)); | |
4193 | executor_status = action_executor_enqueue( | |
4194 | state->executor, element->trigger, client_list); | |
4195 | switch (executor_status) { | |
4196 | case ACTION_EXECUTOR_STATUS_OK: | |
4197 | ret = 0; | |
4198 | break; | |
4199 | case ACTION_EXECUTOR_STATUS_OVERFLOW: | |
4200 | { | |
4201 | struct notification_client_list_element *client_list_element, | |
4202 | *tmp; | |
4203 | ||
4204 | /* | |
4205 | * Not a fatal error; this is expected and simply means the | |
4206 | * executor has too much work queued already. | |
4207 | */ | |
4208 | ret = 0; | |
4209 | ||
4210 | if (!client_list) { | |
4211 | break; | |
4212 | } | |
4213 | ||
4214 | /* Warn clients that a notification (or more) was dropped. */ | |
4215 | pthread_mutex_lock(&client_list->lock); | |
4216 | cds_list_for_each_entry_safe(client_list_element, tmp, | |
4217 | &client_list->list, node) { | |
4218 | enum client_transmission_status transmission_status; | |
4219 | struct notification_client *client = | |
4220 | client_list_element->client; | |
4221 | ||
4222 | pthread_mutex_lock(&client->lock); | |
4223 | ret = client_notification_overflow(client); | |
4224 | if (ret) { | |
4225 | /* Fatal error. */ | |
4226 | goto next_client; | |
4227 | } | |
4228 | ||
4229 | transmission_status = | |
4230 | client_flush_outgoing_queue(client); | |
4231 | ret = client_handle_transmission_status( | |
4232 | client, transmission_status, state); | |
4233 | if (ret) { | |
4234 | /* Fatal error. */ | |
4235 | goto next_client; | |
4236 | } | |
4237 | next_client: | |
4238 | pthread_mutex_unlock(&client->lock); | |
4239 | if (ret) { | |
4240 | break; | |
4241 | } | |
4242 | } | |
4243 | pthread_mutex_lock(&client_list->lock); | |
4244 | break; | |
4245 | } | |
4246 | case ACTION_EXECUTOR_STATUS_ERROR: | |
4247 | /* Fatal error, shut down everything. */ | |
4248 | ERR("Fatal error encoutered while enqueuing action"); | |
4249 | ret = -1; | |
4250 | goto end_unlock; | |
4251 | default: | |
4252 | /* Unhandled error. */ | |
4253 | abort(); | |
4254 | } | |
4255 | ||
4256 | end_unlock: | |
4257 | notification_client_list_put(client_list); | |
4258 | rcu_read_unlock(); | |
4259 | end: | |
4260 | return ret; | |
4261 | } | |
4262 | ||
ab0ee2ca JG |
4263 | int handle_notification_thread_channel_sample( |
4264 | struct notification_thread_state *state, int pipe, | |
4265 | enum lttng_domain_type domain) | |
4266 | { | |
4267 | int ret = 0; | |
4268 | struct lttcomm_consumer_channel_monitor_msg sample_msg; | |
ab0ee2ca JG |
4269 | struct channel_info *channel_info; |
4270 | struct cds_lfht_node *node; | |
4271 | struct cds_lfht_iter iter; | |
4272 | struct lttng_channel_trigger_list *trigger_list; | |
4273 | struct lttng_trigger_list_element *trigger_list_element; | |
4274 | bool previous_sample_available = false; | |
e8360425 JD |
4275 | struct channel_state_sample previous_sample, latest_sample; |
4276 | uint64_t previous_session_consumed_total, latest_session_consumed_total; | |
ab0ee2ca JG |
4277 | |
4278 | /* | |
4279 | * The monitoring pipe only holds messages smaller than PIPE_BUF, | |
4280 | * ensuring that read/write of sampling messages are atomic. | |
4281 | */ | |
7c2551ef | 4282 | ret = lttng_read(pipe, &sample_msg, sizeof(sample_msg)); |
ab0ee2ca JG |
4283 | if (ret != sizeof(sample_msg)) { |
4284 | ERR("[notification-thread] Failed to read from monitoring pipe (fd = %i)", | |
4285 | pipe); | |
4286 | ret = -1; | |
4287 | goto end; | |
4288 | } | |
4289 | ||
4290 | ret = 0; | |
4291 | latest_sample.key.key = sample_msg.key; | |
4292 | latest_sample.key.domain = domain; | |
4293 | latest_sample.highest_usage = sample_msg.highest; | |
4294 | latest_sample.lowest_usage = sample_msg.lowest; | |
e8360425 | 4295 | latest_sample.channel_total_consumed = sample_msg.total_consumed; |
ab0ee2ca JG |
4296 | |
4297 | rcu_read_lock(); | |
4298 | ||
4299 | /* Retrieve the channel's informations */ | |
4300 | cds_lfht_lookup(state->channels_ht, | |
4301 | hash_channel_key(&latest_sample.key), | |
4302 | match_channel_info, | |
4303 | &latest_sample.key, | |
4304 | &iter); | |
4305 | node = cds_lfht_iter_get_node(&iter); | |
e0b5f87b | 4306 | if (caa_unlikely(!node)) { |
ab0ee2ca JG |
4307 | /* |
4308 | * Not an error since the consumer can push a sample to the pipe | |
4309 | * and the rest of the session daemon could notify us of the | |
4310 | * channel's destruction before we get a chance to process that | |
4311 | * sample. | |
4312 | */ | |
4313 | DBG("[notification-thread] Received a sample for an unknown channel from consumerd, key = %" PRIu64 " in %s domain", | |
4314 | latest_sample.key.key, | |
4315 | domain == LTTNG_DOMAIN_KERNEL ? "kernel" : | |
4316 | "user space"); | |
4317 | goto end_unlock; | |
4318 | } | |
4319 | channel_info = caa_container_of(node, struct channel_info, | |
4320 | channels_ht_node); | |
e8360425 | 4321 | DBG("[notification-thread] Handling channel sample for channel %s (key = %" PRIu64 ") in session %s (highest usage = %" PRIu64 ", lowest usage = %" PRIu64", total consumed = %" PRIu64")", |
8abe313a | 4322 | channel_info->name, |
ab0ee2ca | 4323 | latest_sample.key.key, |
8abe313a | 4324 | channel_info->session_info->name, |
ab0ee2ca | 4325 | latest_sample.highest_usage, |
e8360425 JD |
4326 | latest_sample.lowest_usage, |
4327 | latest_sample.channel_total_consumed); | |
4328 | ||
4329 | previous_session_consumed_total = | |
4330 | channel_info->session_info->consumed_data_size; | |
ab0ee2ca JG |
4331 | |
4332 | /* Retrieve the channel's last sample, if it exists, and update it. */ | |
4333 | cds_lfht_lookup(state->channel_state_ht, | |
4334 | hash_channel_key(&latest_sample.key), | |
4335 | match_channel_state_sample, | |
4336 | &latest_sample.key, | |
4337 | &iter); | |
4338 | node = cds_lfht_iter_get_node(&iter); | |
e0b5f87b | 4339 | if (caa_likely(node)) { |
ab0ee2ca JG |
4340 | struct channel_state_sample *stored_sample; |
4341 | ||
4342 | /* Update the sample stored. */ | |
4343 | stored_sample = caa_container_of(node, | |
4344 | struct channel_state_sample, | |
4345 | channel_state_ht_node); | |
e8360425 | 4346 | |
ab0ee2ca JG |
4347 | memcpy(&previous_sample, stored_sample, |
4348 | sizeof(previous_sample)); | |
4349 | stored_sample->highest_usage = latest_sample.highest_usage; | |
4350 | stored_sample->lowest_usage = latest_sample.lowest_usage; | |
0f0479d7 | 4351 | stored_sample->channel_total_consumed = latest_sample.channel_total_consumed; |
ab0ee2ca | 4352 | previous_sample_available = true; |
e8360425 JD |
4353 | |
4354 | latest_session_consumed_total = | |
4355 | previous_session_consumed_total + | |
4356 | (latest_sample.channel_total_consumed - previous_sample.channel_total_consumed); | |
ab0ee2ca JG |
4357 | } else { |
4358 | /* | |
4359 | * This is the channel's first sample, allocate space for and | |
4360 | * store the new sample. | |
4361 | */ | |
4362 | struct channel_state_sample *stored_sample; | |
4363 | ||
4364 | stored_sample = zmalloc(sizeof(*stored_sample)); | |
4365 | if (!stored_sample) { | |
4366 | ret = -1; | |
4367 | goto end_unlock; | |
4368 | } | |
4369 | ||
4370 | memcpy(stored_sample, &latest_sample, sizeof(*stored_sample)); | |
4371 | cds_lfht_node_init(&stored_sample->channel_state_ht_node); | |
4372 | cds_lfht_add(state->channel_state_ht, | |
4373 | hash_channel_key(&stored_sample->key), | |
4374 | &stored_sample->channel_state_ht_node); | |
e8360425 JD |
4375 | |
4376 | latest_session_consumed_total = | |
4377 | previous_session_consumed_total + | |
4378 | latest_sample.channel_total_consumed; | |
ab0ee2ca JG |
4379 | } |
4380 | ||
e8360425 JD |
4381 | channel_info->session_info->consumed_data_size = |
4382 | latest_session_consumed_total; | |
4383 | ||
ab0ee2ca JG |
4384 | /* Find triggers associated with this channel. */ |
4385 | cds_lfht_lookup(state->channel_triggers_ht, | |
4386 | hash_channel_key(&latest_sample.key), | |
4387 | match_channel_trigger_list, | |
4388 | &latest_sample.key, | |
4389 | &iter); | |
4390 | node = cds_lfht_iter_get_node(&iter); | |
e0b5f87b | 4391 | if (caa_likely(!node)) { |
ab0ee2ca JG |
4392 | goto end_unlock; |
4393 | } | |
4394 | ||
4395 | trigger_list = caa_container_of(node, struct lttng_channel_trigger_list, | |
4396 | channel_triggers_ht_node); | |
4397 | cds_list_for_each_entry(trigger_list_element, &trigger_list->list, | |
4398 | node) { | |
9b63a4aa JG |
4399 | const struct lttng_condition *condition; |
4400 | const struct lttng_action *action; | |
1831ae68 FD |
4401 | struct lttng_trigger *trigger; |
4402 | struct notification_client_list *client_list = NULL; | |
ab0ee2ca | 4403 | struct lttng_evaluation *evaluation = NULL; |
1831ae68 | 4404 | bool client_list_is_empty; |
ab0ee2ca | 4405 | |
1831ae68 | 4406 | ret = 0; |
ab0ee2ca | 4407 | trigger = trigger_list_element->trigger; |
9b63a4aa | 4408 | condition = lttng_trigger_get_const_condition(trigger); |
ab0ee2ca | 4409 | assert(condition); |
9b63a4aa | 4410 | action = lttng_trigger_get_const_action(trigger); |
1831ae68 FD |
4411 | |
4412 | if (!lttng_trigger_is_ready_to_fire(trigger)) { | |
4413 | goto put_list; | |
4414 | } | |
ab0ee2ca JG |
4415 | |
4416 | /* Notify actions are the only type currently supported. */ | |
1831ae68 | 4417 | /* TODO support other type of action */ |
9b63a4aa | 4418 | assert(lttng_action_get_type_const(action) == |
ab0ee2ca JG |
4419 | LTTNG_ACTION_TYPE_NOTIFY); |
4420 | ||
4421 | /* | |
4422 | * Check if any client is subscribed to the result of this | |
4423 | * evaluation. | |
4424 | */ | |
ed327204 JG |
4425 | client_list = get_client_list_from_condition(state, condition); |
4426 | assert(client_list); | |
1831ae68 FD |
4427 | client_list_is_empty = cds_list_empty(&client_list->list); |
4428 | if (client_list_is_empty) { | |
ab0ee2ca JG |
4429 | /* |
4430 | * No clients interested in the evaluation's result, | |
4431 | * skip it. | |
4432 | */ | |
1831ae68 | 4433 | goto put_list; |
ab0ee2ca JG |
4434 | } |
4435 | ||
ed327204 | 4436 | ret = evaluate_buffer_condition(condition, &evaluation, state, |
ab0ee2ca | 4437 | previous_sample_available ? &previous_sample : NULL, |
e8360425 JD |
4438 | &latest_sample, |
4439 | previous_session_consumed_total, | |
4440 | latest_session_consumed_total, | |
4441 | channel_info); | |
4442 | if (caa_unlikely(ret)) { | |
1831ae68 | 4443 | goto put_list; |
ab0ee2ca JG |
4444 | } |
4445 | ||
e8360425 | 4446 | if (caa_likely(!evaluation)) { |
1831ae68 | 4447 | goto put_list; |
ab0ee2ca JG |
4448 | } |
4449 | ||
4450 | /* Dispatch evaluation result to all clients. */ | |
4451 | ret = send_evaluation_to_clients(trigger_list_element->trigger, | |
4452 | evaluation, client_list, state, | |
8abe313a JG |
4453 | channel_info->session_info->uid, |
4454 | channel_info->session_info->gid); | |
4455 | lttng_evaluation_destroy(evaluation); | |
1831ae68 FD |
4456 | put_list: |
4457 | notification_client_list_put(client_list); | |
e0b5f87b | 4458 | if (caa_unlikely(ret)) { |
1831ae68 | 4459 | break; |
ab0ee2ca JG |
4460 | } |
4461 | } | |
4462 | end_unlock: | |
4463 | rcu_read_unlock(); | |
4464 | end: | |
4465 | return ret; | |
4466 | } |