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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> |
ab0ee2ca JG |
22 | #include <lttng/notification/notification-internal.h> |
23 | #include <lttng/condition/condition-internal.h> | |
24 | #include <lttng/condition/buffer-usage-internal.h> | |
e8360425 | 25 | #include <lttng/condition/session-consumed-size-internal.h> |
ea9a44f0 | 26 | #include <lttng/condition/session-rotation-internal.h> |
ab0ee2ca | 27 | #include <lttng/notification/channel-internal.h> |
1da26331 | 28 | |
ab0ee2ca JG |
29 | #include <time.h> |
30 | #include <unistd.h> | |
31 | #include <assert.h> | |
32 | #include <inttypes.h> | |
d53ea4e4 | 33 | #include <fcntl.h> |
ab0ee2ca | 34 | |
1da26331 JG |
35 | #include "notification-thread.h" |
36 | #include "notification-thread-events.h" | |
37 | #include "notification-thread-commands.h" | |
38 | #include "lttng-sessiond.h" | |
39 | #include "kernel.h" | |
40 | ||
ab0ee2ca JG |
41 | #define CLIENT_POLL_MASK_IN (LPOLLIN | LPOLLERR | LPOLLHUP | LPOLLRDHUP) |
42 | #define CLIENT_POLL_MASK_IN_OUT (CLIENT_POLL_MASK_IN | LPOLLOUT) | |
43 | ||
51eab943 JG |
44 | enum lttng_object_type { |
45 | LTTNG_OBJECT_TYPE_UNKNOWN, | |
46 | LTTNG_OBJECT_TYPE_NONE, | |
47 | LTTNG_OBJECT_TYPE_CHANNEL, | |
48 | LTTNG_OBJECT_TYPE_SESSION, | |
49 | }; | |
50 | ||
ab0ee2ca | 51 | struct lttng_trigger_list_element { |
9e0bb80e | 52 | /* No ownership of the trigger object is assumed. */ |
d1ba29d2 | 53 | struct lttng_trigger *trigger; |
ab0ee2ca JG |
54 | struct cds_list_head node; |
55 | }; | |
56 | ||
57 | struct lttng_channel_trigger_list { | |
58 | struct channel_key channel_key; | |
ea9a44f0 | 59 | /* List of struct lttng_trigger_list_element. */ |
ab0ee2ca | 60 | struct cds_list_head list; |
ea9a44f0 | 61 | /* Node in the channel_triggers_ht */ |
ab0ee2ca | 62 | struct cds_lfht_node channel_triggers_ht_node; |
83b934ad MD |
63 | /* call_rcu delayed reclaim. */ |
64 | struct rcu_head rcu_node; | |
ab0ee2ca JG |
65 | }; |
66 | ||
ea9a44f0 JG |
67 | /* |
68 | * List of triggers applying to a given session. | |
69 | * | |
70 | * See: | |
71 | * - lttng_session_trigger_list_create() | |
72 | * - lttng_session_trigger_list_build() | |
73 | * - lttng_session_trigger_list_destroy() | |
74 | * - lttng_session_trigger_list_add() | |
75 | */ | |
76 | struct lttng_session_trigger_list { | |
77 | /* | |
78 | * Not owned by this; points to the session_info structure's | |
79 | * session name. | |
80 | */ | |
81 | const char *session_name; | |
82 | /* List of struct lttng_trigger_list_element. */ | |
83 | struct cds_list_head list; | |
84 | /* Node in the session_triggers_ht */ | |
85 | struct cds_lfht_node session_triggers_ht_node; | |
86 | /* | |
87 | * Weak reference to the notification system's session triggers | |
88 | * hashtable. | |
89 | * | |
90 | * The session trigger list structure structure is owned by | |
91 | * the session's session_info. | |
92 | * | |
93 | * The session_info is kept alive the the channel_infos holding a | |
94 | * reference to it (reference counting). When those channels are | |
95 | * destroyed (at runtime or on teardown), the reference they hold | |
96 | * to the session_info are released. On destruction of session_info, | |
97 | * session_info_destroy() will remove the list of triggers applying | |
98 | * to this session from the notification system's state. | |
99 | * | |
100 | * This implies that the session_triggers_ht must be destroyed | |
101 | * after the channels. | |
102 | */ | |
103 | struct cds_lfht *session_triggers_ht; | |
104 | /* Used for delayed RCU reclaim. */ | |
105 | struct rcu_head rcu_node; | |
106 | }; | |
107 | ||
ab0ee2ca JG |
108 | struct lttng_trigger_ht_element { |
109 | struct lttng_trigger *trigger; | |
110 | struct cds_lfht_node node; | |
83b934ad MD |
111 | /* call_rcu delayed reclaim. */ |
112 | struct rcu_head rcu_node; | |
ab0ee2ca JG |
113 | }; |
114 | ||
115 | struct lttng_condition_list_element { | |
116 | struct lttng_condition *condition; | |
117 | struct cds_list_head node; | |
118 | }; | |
119 | ||
ab0ee2ca JG |
120 | struct channel_state_sample { |
121 | struct channel_key key; | |
122 | struct cds_lfht_node channel_state_ht_node; | |
123 | uint64_t highest_usage; | |
124 | uint64_t lowest_usage; | |
e8360425 | 125 | uint64_t channel_total_consumed; |
83b934ad MD |
126 | /* call_rcu delayed reclaim. */ |
127 | struct rcu_head rcu_node; | |
ab0ee2ca JG |
128 | }; |
129 | ||
e4db5ace | 130 | static unsigned long hash_channel_key(struct channel_key *key); |
ed327204 | 131 | static int evaluate_buffer_condition(const struct lttng_condition *condition, |
e4db5ace | 132 | struct lttng_evaluation **evaluation, |
e8360425 JD |
133 | const struct notification_thread_state *state, |
134 | const struct channel_state_sample *previous_sample, | |
135 | const struct channel_state_sample *latest_sample, | |
136 | uint64_t previous_session_consumed_total, | |
137 | uint64_t latest_session_consumed_total, | |
138 | struct channel_info *channel_info); | |
e4db5ace | 139 | static |
9b63a4aa JG |
140 | int send_evaluation_to_clients(const struct lttng_trigger *trigger, |
141 | const struct lttng_evaluation *evaluation, | |
e4db5ace JR |
142 | struct notification_client_list *client_list, |
143 | struct notification_thread_state *state, | |
144 | uid_t channel_uid, gid_t channel_gid); | |
145 | ||
8abe313a | 146 | |
ea9a44f0 | 147 | /* session_info API */ |
8abe313a JG |
148 | static |
149 | void session_info_destroy(void *_data); | |
150 | static | |
151 | void session_info_get(struct session_info *session_info); | |
152 | static | |
153 | void session_info_put(struct session_info *session_info); | |
154 | static | |
155 | struct session_info *session_info_create(const char *name, | |
ea9a44f0 | 156 | uid_t uid, gid_t gid, |
1eee26c5 JG |
157 | struct lttng_session_trigger_list *trigger_list, |
158 | struct cds_lfht *sessions_ht); | |
8abe313a JG |
159 | static |
160 | void session_info_add_channel(struct session_info *session_info, | |
161 | struct channel_info *channel_info); | |
162 | static | |
163 | void session_info_remove_channel(struct session_info *session_info, | |
164 | struct channel_info *channel_info); | |
165 | ||
ea9a44f0 JG |
166 | /* lttng_session_trigger_list API */ |
167 | static | |
168 | struct lttng_session_trigger_list *lttng_session_trigger_list_create( | |
169 | const char *session_name, | |
170 | struct cds_lfht *session_triggers_ht); | |
171 | static | |
172 | struct lttng_session_trigger_list *lttng_session_trigger_list_build( | |
173 | const struct notification_thread_state *state, | |
174 | const char *session_name); | |
175 | static | |
176 | void lttng_session_trigger_list_destroy( | |
177 | struct lttng_session_trigger_list *list); | |
178 | static | |
179 | int lttng_session_trigger_list_add(struct lttng_session_trigger_list *list, | |
d1ba29d2 | 180 | struct lttng_trigger *trigger); |
ea9a44f0 | 181 | |
d1ba29d2 JG |
182 | static |
183 | int client_handle_transmission_status( | |
184 | struct notification_client *client, | |
185 | enum client_transmission_status transmission_status, | |
186 | struct notification_thread_state *state); | |
ea9a44f0 | 187 | |
ab0ee2ca | 188 | static |
ac1889bf | 189 | int match_client_socket(struct cds_lfht_node *node, const void *key) |
ab0ee2ca JG |
190 | { |
191 | /* This double-cast is intended to supress pointer-to-cast warning. */ | |
ac1889bf JG |
192 | const int socket = (int) (intptr_t) key; |
193 | const struct notification_client *client = caa_container_of(node, | |
194 | struct notification_client, client_socket_ht_node); | |
ab0ee2ca | 195 | |
ac1889bf JG |
196 | return client->socket == socket; |
197 | } | |
198 | ||
199 | static | |
200 | int match_client_id(struct cds_lfht_node *node, const void *key) | |
201 | { | |
202 | /* This double-cast is intended to supress pointer-to-cast warning. */ | |
203 | const notification_client_id id = *((notification_client_id *) key); | |
204 | const struct notification_client *client = caa_container_of( | |
205 | node, struct notification_client, client_id_ht_node); | |
ab0ee2ca | 206 | |
ac1889bf | 207 | return client->id == id; |
ab0ee2ca JG |
208 | } |
209 | ||
210 | static | |
211 | int match_channel_trigger_list(struct cds_lfht_node *node, const void *key) | |
212 | { | |
213 | struct channel_key *channel_key = (struct channel_key *) key; | |
214 | struct lttng_channel_trigger_list *trigger_list; | |
215 | ||
216 | trigger_list = caa_container_of(node, struct lttng_channel_trigger_list, | |
217 | channel_triggers_ht_node); | |
218 | ||
219 | return !!((channel_key->key == trigger_list->channel_key.key) && | |
220 | (channel_key->domain == trigger_list->channel_key.domain)); | |
221 | } | |
222 | ||
51eab943 JG |
223 | static |
224 | int match_session_trigger_list(struct cds_lfht_node *node, const void *key) | |
225 | { | |
226 | const char *session_name = (const char *) key; | |
227 | struct lttng_session_trigger_list *trigger_list; | |
228 | ||
229 | trigger_list = caa_container_of(node, struct lttng_session_trigger_list, | |
230 | session_triggers_ht_node); | |
231 | ||
232 | return !!(strcmp(trigger_list->session_name, session_name) == 0); | |
233 | } | |
234 | ||
ab0ee2ca JG |
235 | static |
236 | int match_channel_state_sample(struct cds_lfht_node *node, const void *key) | |
237 | { | |
238 | struct channel_key *channel_key = (struct channel_key *) key; | |
239 | struct channel_state_sample *sample; | |
240 | ||
241 | sample = caa_container_of(node, struct channel_state_sample, | |
242 | channel_state_ht_node); | |
243 | ||
244 | return !!((channel_key->key == sample->key.key) && | |
245 | (channel_key->domain == sample->key.domain)); | |
246 | } | |
247 | ||
248 | static | |
249 | int match_channel_info(struct cds_lfht_node *node, const void *key) | |
250 | { | |
251 | struct channel_key *channel_key = (struct channel_key *) key; | |
252 | struct channel_info *channel_info; | |
253 | ||
254 | channel_info = caa_container_of(node, struct channel_info, | |
255 | channels_ht_node); | |
256 | ||
257 | return !!((channel_key->key == channel_info->key.key) && | |
258 | (channel_key->domain == channel_info->key.domain)); | |
259 | } | |
260 | ||
261 | static | |
262 | int match_condition(struct cds_lfht_node *node, const void *key) | |
263 | { | |
264 | struct lttng_condition *condition_key = (struct lttng_condition *) key; | |
265 | struct lttng_trigger_ht_element *trigger; | |
266 | struct lttng_condition *condition; | |
267 | ||
268 | trigger = caa_container_of(node, struct lttng_trigger_ht_element, | |
269 | node); | |
270 | condition = lttng_trigger_get_condition(trigger->trigger); | |
271 | assert(condition); | |
272 | ||
273 | return !!lttng_condition_is_equal(condition_key, condition); | |
274 | } | |
275 | ||
ab0ee2ca JG |
276 | static |
277 | int match_client_list_condition(struct cds_lfht_node *node, const void *key) | |
278 | { | |
279 | struct lttng_condition *condition_key = (struct lttng_condition *) key; | |
280 | struct notification_client_list *client_list; | |
f82f93a1 | 281 | const struct lttng_condition *condition; |
ab0ee2ca JG |
282 | |
283 | assert(condition_key); | |
284 | ||
285 | client_list = caa_container_of(node, struct notification_client_list, | |
505b2d90 | 286 | notification_trigger_clients_ht_node); |
f82f93a1 | 287 | condition = lttng_trigger_get_const_condition(client_list->trigger); |
ab0ee2ca JG |
288 | |
289 | return !!lttng_condition_is_equal(condition_key, condition); | |
290 | } | |
291 | ||
f82f93a1 JG |
292 | static |
293 | int match_session(struct cds_lfht_node *node, const void *key) | |
294 | { | |
295 | const char *name = key; | |
296 | struct session_info *session_info = caa_container_of( | |
297 | node, struct session_info, sessions_ht_node); | |
298 | ||
299 | return !strcmp(session_info->name, name); | |
300 | } | |
301 | ||
ab0ee2ca JG |
302 | static |
303 | unsigned long lttng_condition_buffer_usage_hash( | |
9b63a4aa | 304 | const struct lttng_condition *_condition) |
ab0ee2ca | 305 | { |
9a2746aa JG |
306 | unsigned long hash; |
307 | unsigned long condition_type; | |
ab0ee2ca JG |
308 | struct lttng_condition_buffer_usage *condition; |
309 | ||
310 | condition = container_of(_condition, | |
311 | struct lttng_condition_buffer_usage, parent); | |
312 | ||
9a2746aa JG |
313 | condition_type = (unsigned long) condition->parent.type; |
314 | hash = hash_key_ulong((void *) condition_type, lttng_ht_seed); | |
ab0ee2ca JG |
315 | if (condition->session_name) { |
316 | hash ^= hash_key_str(condition->session_name, lttng_ht_seed); | |
317 | } | |
318 | if (condition->channel_name) { | |
8f56701f | 319 | hash ^= hash_key_str(condition->channel_name, lttng_ht_seed); |
ab0ee2ca JG |
320 | } |
321 | if (condition->domain.set) { | |
322 | hash ^= hash_key_ulong( | |
323 | (void *) condition->domain.type, | |
324 | lttng_ht_seed); | |
325 | } | |
326 | if (condition->threshold_ratio.set) { | |
327 | uint64_t val; | |
328 | ||
329 | val = condition->threshold_ratio.value * (double) UINT32_MAX; | |
330 | hash ^= hash_key_u64(&val, lttng_ht_seed); | |
6633b0dd | 331 | } else if (condition->threshold_bytes.set) { |
ab0ee2ca JG |
332 | uint64_t val; |
333 | ||
334 | val = condition->threshold_bytes.value; | |
335 | hash ^= hash_key_u64(&val, lttng_ht_seed); | |
336 | } | |
337 | return hash; | |
338 | } | |
339 | ||
e8360425 JD |
340 | static |
341 | unsigned long lttng_condition_session_consumed_size_hash( | |
9b63a4aa | 342 | const struct lttng_condition *_condition) |
e8360425 | 343 | { |
9a2746aa JG |
344 | unsigned long hash; |
345 | unsigned long condition_type = | |
346 | (unsigned long) LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE; | |
e8360425 JD |
347 | struct lttng_condition_session_consumed_size *condition; |
348 | uint64_t val; | |
349 | ||
350 | condition = container_of(_condition, | |
351 | struct lttng_condition_session_consumed_size, parent); | |
352 | ||
9a2746aa | 353 | hash = hash_key_ulong((void *) condition_type, lttng_ht_seed); |
e8360425 JD |
354 | if (condition->session_name) { |
355 | hash ^= hash_key_str(condition->session_name, lttng_ht_seed); | |
356 | } | |
357 | val = condition->consumed_threshold_bytes.value; | |
358 | hash ^= hash_key_u64(&val, lttng_ht_seed); | |
359 | return hash; | |
360 | } | |
361 | ||
a8393880 JG |
362 | static |
363 | unsigned long lttng_condition_session_rotation_hash( | |
364 | const struct lttng_condition *_condition) | |
365 | { | |
366 | unsigned long hash, condition_type; | |
367 | struct lttng_condition_session_rotation *condition; | |
368 | ||
369 | condition = container_of(_condition, | |
370 | struct lttng_condition_session_rotation, parent); | |
371 | condition_type = (unsigned long) condition->parent.type; | |
372 | hash = hash_key_ulong((void *) condition_type, lttng_ht_seed); | |
373 | assert(condition->session_name); | |
374 | hash ^= hash_key_str(condition->session_name, lttng_ht_seed); | |
375 | return hash; | |
376 | } | |
9a2746aa | 377 | |
ab0ee2ca JG |
378 | /* |
379 | * The lttng_condition hashing code is kept in this file (rather than | |
380 | * condition.c) since it makes use of GPLv2 code (hashtable utils), which we | |
381 | * don't want to link in liblttng-ctl. | |
382 | */ | |
383 | static | |
9b63a4aa | 384 | unsigned long lttng_condition_hash(const struct lttng_condition *condition) |
ab0ee2ca JG |
385 | { |
386 | switch (condition->type) { | |
387 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
388 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
389 | return lttng_condition_buffer_usage_hash(condition); | |
e8360425 JD |
390 | case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE: |
391 | return lttng_condition_session_consumed_size_hash(condition); | |
a8393880 JG |
392 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING: |
393 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED: | |
394 | return lttng_condition_session_rotation_hash(condition); | |
ab0ee2ca JG |
395 | default: |
396 | ERR("[notification-thread] Unexpected condition type caught"); | |
397 | abort(); | |
398 | } | |
399 | } | |
400 | ||
e4db5ace JR |
401 | static |
402 | unsigned long hash_channel_key(struct channel_key *key) | |
403 | { | |
404 | unsigned long key_hash = hash_key_u64(&key->key, lttng_ht_seed); | |
405 | unsigned long domain_hash = hash_key_ulong( | |
406 | (void *) (unsigned long) key->domain, lttng_ht_seed); | |
407 | ||
408 | return key_hash ^ domain_hash; | |
409 | } | |
410 | ||
ac1889bf JG |
411 | static |
412 | unsigned long hash_client_socket(int socket) | |
413 | { | |
414 | return hash_key_ulong((void *) (unsigned long) socket, lttng_ht_seed); | |
415 | } | |
416 | ||
417 | static | |
418 | unsigned long hash_client_id(notification_client_id id) | |
419 | { | |
420 | return hash_key_u64(&id, lttng_ht_seed); | |
421 | } | |
422 | ||
f82f93a1 JG |
423 | /* |
424 | * Get the type of object to which a given condition applies. Bindings let | |
425 | * the notification system evaluate a trigger's condition when a given | |
426 | * object's state is updated. | |
427 | * | |
428 | * For instance, a condition bound to a channel will be evaluated everytime | |
429 | * the channel's state is changed by a channel monitoring sample. | |
430 | */ | |
431 | static | |
432 | enum lttng_object_type get_condition_binding_object( | |
433 | const struct lttng_condition *condition) | |
434 | { | |
435 | switch (lttng_condition_get_type(condition)) { | |
436 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
437 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
438 | case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE: | |
e742b055 | 439 | return LTTNG_OBJECT_TYPE_CHANNEL; |
f82f93a1 JG |
440 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING: |
441 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED: | |
442 | return LTTNG_OBJECT_TYPE_SESSION; | |
443 | default: | |
444 | return LTTNG_OBJECT_TYPE_UNKNOWN; | |
445 | } | |
446 | } | |
447 | ||
83b934ad MD |
448 | static |
449 | void free_channel_info_rcu(struct rcu_head *node) | |
450 | { | |
451 | free(caa_container_of(node, struct channel_info, rcu_node)); | |
452 | } | |
453 | ||
ab0ee2ca JG |
454 | static |
455 | void channel_info_destroy(struct channel_info *channel_info) | |
456 | { | |
457 | if (!channel_info) { | |
458 | return; | |
459 | } | |
460 | ||
8abe313a JG |
461 | if (channel_info->session_info) { |
462 | session_info_remove_channel(channel_info->session_info, | |
463 | channel_info); | |
464 | session_info_put(channel_info->session_info); | |
ab0ee2ca | 465 | } |
8abe313a JG |
466 | if (channel_info->name) { |
467 | free(channel_info->name); | |
ab0ee2ca | 468 | } |
83b934ad MD |
469 | call_rcu(&channel_info->rcu_node, free_channel_info_rcu); |
470 | } | |
471 | ||
472 | static | |
473 | void free_session_info_rcu(struct rcu_head *node) | |
474 | { | |
475 | free(caa_container_of(node, struct session_info, rcu_node)); | |
ab0ee2ca JG |
476 | } |
477 | ||
8abe313a | 478 | /* Don't call directly, use the ref-counting mechanism. */ |
ab0ee2ca | 479 | static |
8abe313a | 480 | void session_info_destroy(void *_data) |
ab0ee2ca | 481 | { |
8abe313a | 482 | struct session_info *session_info = _data; |
3b68d0a3 | 483 | int ret; |
ab0ee2ca | 484 | |
8abe313a JG |
485 | assert(session_info); |
486 | if (session_info->channel_infos_ht) { | |
3b68d0a3 JR |
487 | ret = cds_lfht_destroy(session_info->channel_infos_ht, NULL); |
488 | if (ret) { | |
4c3f302b | 489 | ERR("[notification-thread] Failed to destroy channel information hash table"); |
3b68d0a3 | 490 | } |
8abe313a | 491 | } |
ea9a44f0 | 492 | lttng_session_trigger_list_destroy(session_info->trigger_list); |
1eee26c5 JG |
493 | |
494 | rcu_read_lock(); | |
495 | cds_lfht_del(session_info->sessions_ht, | |
496 | &session_info->sessions_ht_node); | |
497 | rcu_read_unlock(); | |
8abe313a | 498 | free(session_info->name); |
83b934ad | 499 | call_rcu(&session_info->rcu_node, free_session_info_rcu); |
8abe313a | 500 | } |
ab0ee2ca | 501 | |
8abe313a JG |
502 | static |
503 | void session_info_get(struct session_info *session_info) | |
504 | { | |
505 | if (!session_info) { | |
506 | return; | |
507 | } | |
508 | lttng_ref_get(&session_info->ref); | |
509 | } | |
510 | ||
511 | static | |
512 | void session_info_put(struct session_info *session_info) | |
513 | { | |
514 | if (!session_info) { | |
515 | return; | |
ab0ee2ca | 516 | } |
8abe313a JG |
517 | lttng_ref_put(&session_info->ref); |
518 | } | |
519 | ||
520 | static | |
ea9a44f0 | 521 | struct session_info *session_info_create(const char *name, uid_t uid, gid_t gid, |
1eee26c5 JG |
522 | struct lttng_session_trigger_list *trigger_list, |
523 | struct cds_lfht *sessions_ht) | |
8abe313a JG |
524 | { |
525 | struct session_info *session_info; | |
ab0ee2ca | 526 | |
8abe313a | 527 | assert(name); |
ab0ee2ca | 528 | |
8abe313a JG |
529 | session_info = zmalloc(sizeof(*session_info)); |
530 | if (!session_info) { | |
531 | goto end; | |
532 | } | |
533 | lttng_ref_init(&session_info->ref, session_info_destroy); | |
534 | ||
535 | session_info->channel_infos_ht = cds_lfht_new(DEFAULT_HT_SIZE, | |
536 | 1, 0, CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, NULL); | |
537 | if (!session_info->channel_infos_ht) { | |
ab0ee2ca JG |
538 | goto error; |
539 | } | |
8abe313a JG |
540 | |
541 | cds_lfht_node_init(&session_info->sessions_ht_node); | |
542 | session_info->name = strdup(name); | |
543 | if (!session_info->name) { | |
ab0ee2ca JG |
544 | goto error; |
545 | } | |
8abe313a JG |
546 | session_info->uid = uid; |
547 | session_info->gid = gid; | |
ea9a44f0 | 548 | session_info->trigger_list = trigger_list; |
1eee26c5 | 549 | session_info->sessions_ht = sessions_ht; |
8abe313a JG |
550 | end: |
551 | return session_info; | |
552 | error: | |
553 | session_info_put(session_info); | |
554 | return NULL; | |
555 | } | |
556 | ||
557 | static | |
558 | void session_info_add_channel(struct session_info *session_info, | |
559 | struct channel_info *channel_info) | |
560 | { | |
561 | rcu_read_lock(); | |
562 | cds_lfht_add(session_info->channel_infos_ht, | |
563 | hash_channel_key(&channel_info->key), | |
564 | &channel_info->session_info_channels_ht_node); | |
565 | rcu_read_unlock(); | |
566 | } | |
567 | ||
568 | static | |
569 | void session_info_remove_channel(struct session_info *session_info, | |
570 | struct channel_info *channel_info) | |
571 | { | |
572 | rcu_read_lock(); | |
573 | cds_lfht_del(session_info->channel_infos_ht, | |
574 | &channel_info->session_info_channels_ht_node); | |
575 | rcu_read_unlock(); | |
576 | } | |
577 | ||
578 | static | |
579 | struct channel_info *channel_info_create(const char *channel_name, | |
580 | struct channel_key *channel_key, uint64_t channel_capacity, | |
581 | struct session_info *session_info) | |
582 | { | |
583 | struct channel_info *channel_info = zmalloc(sizeof(*channel_info)); | |
584 | ||
585 | if (!channel_info) { | |
586 | goto end; | |
587 | } | |
588 | ||
ab0ee2ca | 589 | cds_lfht_node_init(&channel_info->channels_ht_node); |
8abe313a JG |
590 | cds_lfht_node_init(&channel_info->session_info_channels_ht_node); |
591 | memcpy(&channel_info->key, channel_key, sizeof(*channel_key)); | |
592 | channel_info->capacity = channel_capacity; | |
593 | ||
594 | channel_info->name = strdup(channel_name); | |
595 | if (!channel_info->name) { | |
596 | goto error; | |
597 | } | |
598 | ||
599 | /* | |
600 | * Set the references between session and channel infos: | |
601 | * - channel_info holds a strong reference to session_info | |
602 | * - session_info holds a weak reference to channel_info | |
603 | */ | |
604 | session_info_get(session_info); | |
605 | session_info_add_channel(session_info, channel_info); | |
606 | channel_info->session_info = session_info; | |
ab0ee2ca | 607 | end: |
8abe313a | 608 | return channel_info; |
ab0ee2ca | 609 | error: |
8abe313a | 610 | channel_info_destroy(channel_info); |
ab0ee2ca JG |
611 | return NULL; |
612 | } | |
613 | ||
d1ba29d2 | 614 | LTTNG_HIDDEN |
505b2d90 JG |
615 | bool notification_client_list_get(struct notification_client_list *list) |
616 | { | |
617 | return urcu_ref_get_unless_zero(&list->ref); | |
618 | } | |
619 | ||
620 | static | |
621 | void free_notification_client_list_rcu(struct rcu_head *node) | |
622 | { | |
623 | free(caa_container_of(node, struct notification_client_list, | |
624 | rcu_node)); | |
625 | } | |
626 | ||
627 | static | |
628 | void notification_client_list_release(struct urcu_ref *list_ref) | |
629 | { | |
630 | struct notification_client_list *list = | |
631 | container_of(list_ref, typeof(*list), ref); | |
632 | struct notification_client_list_element *client_list_element, *tmp; | |
633 | ||
634 | if (list->notification_trigger_clients_ht) { | |
635 | rcu_read_lock(); | |
636 | cds_lfht_del(list->notification_trigger_clients_ht, | |
637 | &list->notification_trigger_clients_ht_node); | |
638 | rcu_read_unlock(); | |
639 | list->notification_trigger_clients_ht = NULL; | |
640 | } | |
641 | cds_list_for_each_entry_safe(client_list_element, tmp, | |
642 | &list->list, node) { | |
643 | free(client_list_element); | |
644 | } | |
645 | pthread_mutex_destroy(&list->lock); | |
646 | call_rcu(&list->rcu_node, free_notification_client_list_rcu); | |
647 | } | |
648 | ||
649 | static | |
650 | struct notification_client_list *notification_client_list_create( | |
651 | const struct lttng_trigger *trigger) | |
652 | { | |
653 | struct notification_client_list *client_list = | |
654 | zmalloc(sizeof(*client_list)); | |
655 | ||
656 | if (!client_list) { | |
657 | goto error; | |
658 | } | |
659 | pthread_mutex_init(&client_list->lock, NULL); | |
660 | urcu_ref_init(&client_list->ref); | |
661 | cds_lfht_node_init(&client_list->notification_trigger_clients_ht_node); | |
662 | CDS_INIT_LIST_HEAD(&client_list->list); | |
663 | client_list->trigger = trigger; | |
664 | error: | |
665 | return client_list; | |
666 | } | |
667 | ||
668 | static | |
669 | void publish_notification_client_list( | |
670 | struct notification_thread_state *state, | |
671 | struct notification_client_list *list) | |
672 | { | |
673 | const struct lttng_condition *condition = | |
674 | lttng_trigger_get_const_condition(list->trigger); | |
675 | ||
676 | assert(!list->notification_trigger_clients_ht); | |
677 | ||
678 | list->notification_trigger_clients_ht = | |
679 | state->notification_trigger_clients_ht; | |
680 | ||
681 | rcu_read_lock(); | |
682 | cds_lfht_add(state->notification_trigger_clients_ht, | |
683 | lttng_condition_hash(condition), | |
684 | &list->notification_trigger_clients_ht_node); | |
685 | rcu_read_unlock(); | |
686 | } | |
687 | ||
d1ba29d2 | 688 | LTTNG_HIDDEN |
505b2d90 JG |
689 | void notification_client_list_put(struct notification_client_list *list) |
690 | { | |
691 | if (!list) { | |
692 | return; | |
693 | } | |
694 | return urcu_ref_put(&list->ref, notification_client_list_release); | |
695 | } | |
696 | ||
697 | /* Provides a reference to the returned list. */ | |
ed327204 JG |
698 | static |
699 | struct notification_client_list *get_client_list_from_condition( | |
700 | struct notification_thread_state *state, | |
701 | const struct lttng_condition *condition) | |
702 | { | |
703 | struct cds_lfht_node *node; | |
704 | struct cds_lfht_iter iter; | |
505b2d90 | 705 | struct notification_client_list *list = NULL; |
ed327204 | 706 | |
505b2d90 | 707 | rcu_read_lock(); |
ed327204 JG |
708 | cds_lfht_lookup(state->notification_trigger_clients_ht, |
709 | lttng_condition_hash(condition), | |
710 | match_client_list_condition, | |
711 | condition, | |
712 | &iter); | |
713 | node = cds_lfht_iter_get_node(&iter); | |
505b2d90 JG |
714 | if (node) { |
715 | list = container_of(node, struct notification_client_list, | |
716 | notification_trigger_clients_ht_node); | |
717 | list = notification_client_list_get(list) ? list : NULL; | |
718 | } | |
ed327204 | 719 | |
505b2d90 JG |
720 | rcu_read_unlock(); |
721 | return list; | |
ed327204 JG |
722 | } |
723 | ||
e4db5ace | 724 | static |
f82f93a1 JG |
725 | int evaluate_channel_condition_for_client( |
726 | const struct lttng_condition *condition, | |
727 | struct notification_thread_state *state, | |
728 | struct lttng_evaluation **evaluation, | |
729 | uid_t *session_uid, gid_t *session_gid) | |
e4db5ace JR |
730 | { |
731 | int ret; | |
732 | struct cds_lfht_iter iter; | |
733 | struct cds_lfht_node *node; | |
734 | struct channel_info *channel_info = NULL; | |
735 | struct channel_key *channel_key = NULL; | |
736 | struct channel_state_sample *last_sample = NULL; | |
737 | struct lttng_channel_trigger_list *channel_trigger_list = NULL; | |
e4db5ace | 738 | |
505b2d90 JG |
739 | rcu_read_lock(); |
740 | ||
f82f93a1 | 741 | /* Find the channel associated with the condition. */ |
e4db5ace | 742 | cds_lfht_for_each_entry(state->channel_triggers_ht, &iter, |
f82f93a1 | 743 | channel_trigger_list, channel_triggers_ht_node) { |
e4db5ace JR |
744 | struct lttng_trigger_list_element *element; |
745 | ||
746 | cds_list_for_each_entry(element, &channel_trigger_list->list, node) { | |
9b63a4aa | 747 | const struct lttng_condition *current_condition = |
f82f93a1 | 748 | lttng_trigger_get_const_condition( |
e4db5ace JR |
749 | element->trigger); |
750 | ||
751 | assert(current_condition); | |
752 | if (!lttng_condition_is_equal(condition, | |
2ae99f0b | 753 | current_condition)) { |
e4db5ace JR |
754 | continue; |
755 | } | |
756 | ||
757 | /* Found the trigger, save the channel key. */ | |
758 | channel_key = &channel_trigger_list->channel_key; | |
759 | break; | |
760 | } | |
761 | if (channel_key) { | |
762 | /* The channel key was found stop iteration. */ | |
763 | break; | |
764 | } | |
765 | } | |
766 | ||
767 | if (!channel_key){ | |
768 | /* No channel found; normal exit. */ | |
f82f93a1 | 769 | DBG("[notification-thread] No known channel associated with newly subscribed-to condition"); |
e4db5ace JR |
770 | ret = 0; |
771 | goto end; | |
772 | } | |
773 | ||
774 | /* Fetch channel info for the matching channel. */ | |
775 | cds_lfht_lookup(state->channels_ht, | |
776 | hash_channel_key(channel_key), | |
777 | match_channel_info, | |
778 | channel_key, | |
779 | &iter); | |
780 | node = cds_lfht_iter_get_node(&iter); | |
781 | assert(node); | |
782 | channel_info = caa_container_of(node, struct channel_info, | |
783 | channels_ht_node); | |
784 | ||
785 | /* Retrieve the channel's last sample, if it exists. */ | |
786 | cds_lfht_lookup(state->channel_state_ht, | |
787 | hash_channel_key(channel_key), | |
788 | match_channel_state_sample, | |
789 | channel_key, | |
790 | &iter); | |
791 | node = cds_lfht_iter_get_node(&iter); | |
792 | if (node) { | |
793 | last_sample = caa_container_of(node, | |
794 | struct channel_state_sample, | |
795 | channel_state_ht_node); | |
796 | } else { | |
797 | /* Nothing to evaluate, no sample was ever taken. Normal exit */ | |
798 | DBG("[notification-thread] No channel sample associated with newly subscribed-to condition"); | |
799 | ret = 0; | |
800 | goto end; | |
801 | } | |
802 | ||
f82f93a1 | 803 | ret = evaluate_buffer_condition(condition, evaluation, state, |
e8360425 JD |
804 | NULL, last_sample, |
805 | 0, channel_info->session_info->consumed_data_size, | |
806 | channel_info); | |
e4db5ace | 807 | if (ret) { |
066a3c82 | 808 | WARN("[notification-thread] Fatal error occurred while evaluating a newly subscribed-to condition"); |
e4db5ace JR |
809 | goto end; |
810 | } | |
811 | ||
f82f93a1 JG |
812 | *session_uid = channel_info->session_info->uid; |
813 | *session_gid = channel_info->session_info->gid; | |
814 | end: | |
505b2d90 | 815 | rcu_read_unlock(); |
f82f93a1 JG |
816 | return ret; |
817 | } | |
818 | ||
819 | static | |
820 | const char *get_condition_session_name(const struct lttng_condition *condition) | |
821 | { | |
822 | const char *session_name = NULL; | |
823 | enum lttng_condition_status status; | |
824 | ||
825 | switch (lttng_condition_get_type(condition)) { | |
826 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
827 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
828 | status = lttng_condition_buffer_usage_get_session_name( | |
829 | condition, &session_name); | |
830 | break; | |
831 | case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE: | |
832 | status = lttng_condition_session_consumed_size_get_session_name( | |
833 | condition, &session_name); | |
834 | break; | |
835 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING: | |
836 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED: | |
837 | status = lttng_condition_session_rotation_get_session_name( | |
838 | condition, &session_name); | |
839 | break; | |
840 | default: | |
841 | abort(); | |
842 | } | |
843 | if (status != LTTNG_CONDITION_STATUS_OK) { | |
844 | ERR("[notification-thread] Failed to retrieve session rotation condition's session name"); | |
845 | goto end; | |
846 | } | |
847 | end: | |
848 | return session_name; | |
849 | } | |
850 | ||
f82f93a1 JG |
851 | static |
852 | int evaluate_session_condition_for_client( | |
853 | const struct lttng_condition *condition, | |
854 | struct notification_thread_state *state, | |
855 | struct lttng_evaluation **evaluation, | |
856 | uid_t *session_uid, gid_t *session_gid) | |
857 | { | |
858 | int ret; | |
859 | struct cds_lfht_iter iter; | |
860 | struct cds_lfht_node *node; | |
861 | const char *session_name; | |
862 | struct session_info *session_info = NULL; | |
863 | ||
505b2d90 | 864 | rcu_read_lock(); |
f82f93a1 JG |
865 | session_name = get_condition_session_name(condition); |
866 | ||
867 | /* Find the session associated with the trigger. */ | |
868 | cds_lfht_lookup(state->sessions_ht, | |
869 | hash_key_str(session_name, lttng_ht_seed), | |
870 | match_session, | |
871 | session_name, | |
872 | &iter); | |
873 | node = cds_lfht_iter_get_node(&iter); | |
874 | if (!node) { | |
875 | DBG("[notification-thread] No known session matching name \"%s\"", | |
876 | session_name); | |
877 | ret = 0; | |
878 | goto end; | |
879 | } | |
880 | ||
881 | session_info = caa_container_of(node, struct session_info, | |
882 | sessions_ht_node); | |
883 | session_info_get(session_info); | |
884 | ||
885 | /* | |
886 | * Evaluation is performed in-line here since only one type of | |
887 | * session-bound condition is handled for the moment. | |
888 | */ | |
889 | switch (lttng_condition_get_type(condition)) { | |
890 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING: | |
891 | if (!session_info->rotation.ongoing) { | |
be558f88 | 892 | ret = 0; |
f82f93a1 JG |
893 | goto end_session_put; |
894 | } | |
895 | ||
896 | *evaluation = lttng_evaluation_session_rotation_ongoing_create( | |
897 | session_info->rotation.id); | |
898 | if (!*evaluation) { | |
899 | /* Fatal error. */ | |
900 | ERR("[notification-thread] Failed to create session rotation ongoing evaluation for session \"%s\"", | |
901 | session_info->name); | |
902 | ret = -1; | |
903 | goto end_session_put; | |
904 | } | |
905 | ret = 0; | |
906 | break; | |
907 | default: | |
908 | ret = 0; | |
909 | goto end_session_put; | |
910 | } | |
911 | ||
912 | *session_uid = session_info->uid; | |
913 | *session_gid = session_info->gid; | |
914 | ||
915 | end_session_put: | |
916 | session_info_put(session_info); | |
917 | end: | |
505b2d90 | 918 | rcu_read_unlock(); |
f82f93a1 JG |
919 | return ret; |
920 | } | |
921 | ||
f82f93a1 JG |
922 | static |
923 | int evaluate_condition_for_client(const struct lttng_trigger *trigger, | |
924 | const struct lttng_condition *condition, | |
925 | struct notification_client *client, | |
926 | struct notification_thread_state *state) | |
927 | { | |
928 | int ret; | |
929 | struct lttng_evaluation *evaluation = NULL; | |
505b2d90 JG |
930 | struct notification_client_list client_list = { |
931 | .lock = PTHREAD_MUTEX_INITIALIZER, | |
932 | }; | |
f82f93a1 JG |
933 | struct notification_client_list_element client_list_element = { 0 }; |
934 | uid_t object_uid = 0; | |
935 | gid_t object_gid = 0; | |
936 | ||
937 | assert(trigger); | |
938 | assert(condition); | |
939 | assert(client); | |
940 | assert(state); | |
941 | ||
942 | switch (get_condition_binding_object(condition)) { | |
943 | case LTTNG_OBJECT_TYPE_SESSION: | |
944 | ret = evaluate_session_condition_for_client(condition, state, | |
945 | &evaluation, &object_uid, &object_gid); | |
946 | break; | |
947 | case LTTNG_OBJECT_TYPE_CHANNEL: | |
948 | ret = evaluate_channel_condition_for_client(condition, state, | |
949 | &evaluation, &object_uid, &object_gid); | |
950 | break; | |
951 | case LTTNG_OBJECT_TYPE_NONE: | |
952 | ret = 0; | |
953 | goto end; | |
954 | case LTTNG_OBJECT_TYPE_UNKNOWN: | |
955 | default: | |
956 | ret = -1; | |
957 | goto end; | |
958 | } | |
af0c318d JG |
959 | if (ret) { |
960 | /* Fatal error. */ | |
961 | goto end; | |
962 | } | |
e4db5ace JR |
963 | if (!evaluation) { |
964 | /* Evaluation yielded nothing. Normal exit. */ | |
965 | DBG("[notification-thread] Newly subscribed-to condition evaluated to false, nothing to report to client"); | |
966 | ret = 0; | |
967 | goto end; | |
968 | } | |
969 | ||
970 | /* | |
971 | * Create a temporary client list with the client currently | |
972 | * subscribing. | |
973 | */ | |
505b2d90 | 974 | cds_lfht_node_init(&client_list.notification_trigger_clients_ht_node); |
e4db5ace JR |
975 | CDS_INIT_LIST_HEAD(&client_list.list); |
976 | client_list.trigger = trigger; | |
977 | ||
978 | CDS_INIT_LIST_HEAD(&client_list_element.node); | |
979 | client_list_element.client = client; | |
980 | cds_list_add(&client_list_element.node, &client_list.list); | |
981 | ||
982 | /* Send evaluation result to the newly-subscribed client. */ | |
983 | DBG("[notification-thread] Newly subscribed-to condition evaluated to true, notifying client"); | |
984 | ret = send_evaluation_to_clients(trigger, evaluation, &client_list, | |
f82f93a1 | 985 | state, object_uid, object_gid); |
e4db5ace JR |
986 | |
987 | end: | |
988 | return ret; | |
989 | } | |
990 | ||
ab0ee2ca JG |
991 | static |
992 | int notification_thread_client_subscribe(struct notification_client *client, | |
993 | struct lttng_condition *condition, | |
994 | struct notification_thread_state *state, | |
995 | enum lttng_notification_channel_status *_status) | |
996 | { | |
997 | int ret = 0; | |
505b2d90 | 998 | struct notification_client_list *client_list = NULL; |
ab0ee2ca JG |
999 | struct lttng_condition_list_element *condition_list_element = NULL; |
1000 | struct notification_client_list_element *client_list_element = NULL; | |
1001 | enum lttng_notification_channel_status status = | |
1002 | LTTNG_NOTIFICATION_CHANNEL_STATUS_OK; | |
1003 | ||
1004 | /* | |
1005 | * Ensure that the client has not already subscribed to this condition | |
1006 | * before. | |
1007 | */ | |
1008 | cds_list_for_each_entry(condition_list_element, &client->condition_list, node) { | |
1009 | if (lttng_condition_is_equal(condition_list_element->condition, | |
1010 | condition)) { | |
1011 | status = LTTNG_NOTIFICATION_CHANNEL_STATUS_ALREADY_SUBSCRIBED; | |
1012 | goto end; | |
1013 | } | |
1014 | } | |
1015 | ||
1016 | condition_list_element = zmalloc(sizeof(*condition_list_element)); | |
1017 | if (!condition_list_element) { | |
1018 | ret = -1; | |
1019 | goto error; | |
1020 | } | |
1021 | client_list_element = zmalloc(sizeof(*client_list_element)); | |
1022 | if (!client_list_element) { | |
1023 | ret = -1; | |
1024 | goto error; | |
1025 | } | |
1026 | ||
ab0ee2ca JG |
1027 | /* |
1028 | * Add the newly-subscribed condition to the client's subscription list. | |
1029 | */ | |
1030 | CDS_INIT_LIST_HEAD(&condition_list_element->node); | |
1031 | condition_list_element->condition = condition; | |
1032 | cds_list_add(&condition_list_element->node, &client->condition_list); | |
1033 | ||
ed327204 JG |
1034 | client_list = get_client_list_from_condition(state, condition); |
1035 | if (!client_list) { | |
2ae99f0b JG |
1036 | /* |
1037 | * No notification-emiting trigger registered with this | |
1038 | * condition. We don't evaluate the condition right away | |
1039 | * since this trigger is not registered yet. | |
1040 | */ | |
4fb43b68 | 1041 | free(client_list_element); |
505b2d90 | 1042 | goto end; |
ab0ee2ca JG |
1043 | } |
1044 | ||
2ae99f0b JG |
1045 | /* |
1046 | * The condition to which the client just subscribed is evaluated | |
1047 | * at this point so that conditions that are already TRUE result | |
1048 | * in a notification being sent out. | |
505b2d90 JG |
1049 | * |
1050 | * The client_list's trigger is used without locking the list itself. | |
1051 | * This is correct since the list doesn't own the trigger and the | |
1052 | * object is immutable. | |
2ae99f0b | 1053 | */ |
e4db5ace JR |
1054 | if (evaluate_condition_for_client(client_list->trigger, condition, |
1055 | client, state)) { | |
1056 | WARN("[notification-thread] Evaluation of a condition on client subscription failed, aborting."); | |
1057 | ret = -1; | |
4bd5b4af | 1058 | free(client_list_element); |
505b2d90 | 1059 | goto end; |
e4db5ace JR |
1060 | } |
1061 | ||
1062 | /* | |
1063 | * Add the client to the list of clients interested in a given trigger | |
1064 | * if a "notification" trigger with a corresponding condition was | |
1065 | * added prior. | |
1066 | */ | |
ab0ee2ca JG |
1067 | client_list_element->client = client; |
1068 | CDS_INIT_LIST_HEAD(&client_list_element->node); | |
505b2d90 JG |
1069 | |
1070 | pthread_mutex_lock(&client_list->lock); | |
ab0ee2ca | 1071 | cds_list_add(&client_list_element->node, &client_list->list); |
505b2d90 | 1072 | pthread_mutex_unlock(&client_list->lock); |
ab0ee2ca JG |
1073 | end: |
1074 | if (_status) { | |
1075 | *_status = status; | |
1076 | } | |
505b2d90 JG |
1077 | if (client_list) { |
1078 | notification_client_list_put(client_list); | |
1079 | } | |
ab0ee2ca JG |
1080 | return ret; |
1081 | error: | |
1082 | free(condition_list_element); | |
1083 | free(client_list_element); | |
1084 | return ret; | |
1085 | } | |
1086 | ||
1087 | static | |
1088 | int notification_thread_client_unsubscribe( | |
1089 | struct notification_client *client, | |
1090 | struct lttng_condition *condition, | |
1091 | struct notification_thread_state *state, | |
1092 | enum lttng_notification_channel_status *_status) | |
1093 | { | |
ab0ee2ca JG |
1094 | struct notification_client_list *client_list; |
1095 | struct lttng_condition_list_element *condition_list_element, | |
1096 | *condition_tmp; | |
1097 | struct notification_client_list_element *client_list_element, | |
1098 | *client_tmp; | |
1099 | bool condition_found = false; | |
1100 | enum lttng_notification_channel_status status = | |
1101 | LTTNG_NOTIFICATION_CHANNEL_STATUS_OK; | |
1102 | ||
1103 | /* Remove the condition from the client's condition list. */ | |
1104 | cds_list_for_each_entry_safe(condition_list_element, condition_tmp, | |
1105 | &client->condition_list, node) { | |
1106 | if (!lttng_condition_is_equal(condition_list_element->condition, | |
1107 | condition)) { | |
1108 | continue; | |
1109 | } | |
1110 | ||
1111 | cds_list_del(&condition_list_element->node); | |
1112 | /* | |
1113 | * The caller may be iterating on the client's conditions to | |
1114 | * tear down a client's connection. In this case, the condition | |
1115 | * will be destroyed at the end. | |
1116 | */ | |
1117 | if (condition != condition_list_element->condition) { | |
1118 | lttng_condition_destroy( | |
1119 | condition_list_element->condition); | |
1120 | } | |
1121 | free(condition_list_element); | |
1122 | condition_found = true; | |
1123 | break; | |
1124 | } | |
1125 | ||
1126 | if (!condition_found) { | |
1127 | status = LTTNG_NOTIFICATION_CHANNEL_STATUS_UNKNOWN_CONDITION; | |
1128 | goto end; | |
1129 | } | |
1130 | ||
1131 | /* | |
1132 | * Remove the client from the list of clients interested the trigger | |
1133 | * matching the condition. | |
1134 | */ | |
ed327204 JG |
1135 | client_list = get_client_list_from_condition(state, condition); |
1136 | if (!client_list) { | |
505b2d90 | 1137 | goto end; |
ab0ee2ca JG |
1138 | } |
1139 | ||
505b2d90 | 1140 | pthread_mutex_lock(&client_list->lock); |
ab0ee2ca JG |
1141 | cds_list_for_each_entry_safe(client_list_element, client_tmp, |
1142 | &client_list->list, node) { | |
505b2d90 | 1143 | if (client_list_element->client->id != client->id) { |
ab0ee2ca JG |
1144 | continue; |
1145 | } | |
1146 | cds_list_del(&client_list_element->node); | |
1147 | free(client_list_element); | |
1148 | break; | |
1149 | } | |
505b2d90 JG |
1150 | pthread_mutex_unlock(&client_list->lock); |
1151 | notification_client_list_put(client_list); | |
1152 | client_list = NULL; | |
ab0ee2ca JG |
1153 | end: |
1154 | lttng_condition_destroy(condition); | |
1155 | if (_status) { | |
1156 | *_status = status; | |
1157 | } | |
1158 | return 0; | |
1159 | } | |
1160 | ||
83b934ad MD |
1161 | static |
1162 | void free_notification_client_rcu(struct rcu_head *node) | |
1163 | { | |
1164 | free(caa_container_of(node, struct notification_client, rcu_node)); | |
1165 | } | |
1166 | ||
ab0ee2ca JG |
1167 | static |
1168 | void notification_client_destroy(struct notification_client *client, | |
1169 | struct notification_thread_state *state) | |
1170 | { | |
ab0ee2ca JG |
1171 | if (!client) { |
1172 | return; | |
1173 | } | |
1174 | ||
505b2d90 JG |
1175 | /* |
1176 | * The client object is not reachable by other threads, no need to lock | |
1177 | * the client here. | |
1178 | */ | |
ab0ee2ca JG |
1179 | if (client->socket >= 0) { |
1180 | (void) lttcomm_close_unix_sock(client->socket); | |
ac1889bf | 1181 | client->socket = -1; |
ab0ee2ca | 1182 | } |
505b2d90 | 1183 | client->communication.active = false; |
ab0ee2ca JG |
1184 | lttng_dynamic_buffer_reset(&client->communication.inbound.buffer); |
1185 | lttng_dynamic_buffer_reset(&client->communication.outbound.buffer); | |
505b2d90 | 1186 | pthread_mutex_destroy(&client->lock); |
83b934ad | 1187 | call_rcu(&client->rcu_node, free_notification_client_rcu); |
ab0ee2ca JG |
1188 | } |
1189 | ||
1190 | /* | |
1191 | * Call with rcu_read_lock held (and hold for the lifetime of the returned | |
1192 | * client pointer). | |
1193 | */ | |
1194 | static | |
1195 | struct notification_client *get_client_from_socket(int socket, | |
1196 | struct notification_thread_state *state) | |
1197 | { | |
1198 | struct cds_lfht_iter iter; | |
1199 | struct cds_lfht_node *node; | |
1200 | struct notification_client *client = NULL; | |
1201 | ||
1202 | cds_lfht_lookup(state->client_socket_ht, | |
ac1889bf JG |
1203 | hash_client_socket(socket), |
1204 | match_client_socket, | |
ab0ee2ca JG |
1205 | (void *) (unsigned long) socket, |
1206 | &iter); | |
1207 | node = cds_lfht_iter_get_node(&iter); | |
1208 | if (!node) { | |
1209 | goto end; | |
1210 | } | |
1211 | ||
1212 | client = caa_container_of(node, struct notification_client, | |
1213 | client_socket_ht_node); | |
1214 | end: | |
1215 | return client; | |
1216 | } | |
1217 | ||
d1ba29d2 JG |
1218 | /* |
1219 | * Call with rcu_read_lock held (and hold for the lifetime of the returned | |
1220 | * client pointer). | |
1221 | */ | |
1222 | static | |
1223 | struct notification_client *get_client_from_id(notification_client_id id, | |
1224 | struct notification_thread_state *state) | |
1225 | { | |
1226 | struct cds_lfht_iter iter; | |
1227 | struct cds_lfht_node *node; | |
1228 | struct notification_client *client = NULL; | |
1229 | ||
1230 | cds_lfht_lookup(state->client_id_ht, | |
1231 | hash_client_id(id), | |
1232 | match_client_id, | |
1233 | &id, | |
1234 | &iter); | |
1235 | node = cds_lfht_iter_get_node(&iter); | |
1236 | if (!node) { | |
1237 | goto end; | |
1238 | } | |
1239 | ||
1240 | client = caa_container_of(node, struct notification_client, | |
1241 | client_id_ht_node); | |
1242 | end: | |
1243 | return client; | |
1244 | } | |
1245 | ||
ab0ee2ca | 1246 | static |
e8360425 | 1247 | bool buffer_usage_condition_applies_to_channel( |
51eab943 JG |
1248 | const struct lttng_condition *condition, |
1249 | const struct channel_info *channel_info) | |
ab0ee2ca JG |
1250 | { |
1251 | enum lttng_condition_status status; | |
e8360425 JD |
1252 | enum lttng_domain_type condition_domain; |
1253 | const char *condition_session_name = NULL; | |
1254 | const char *condition_channel_name = NULL; | |
ab0ee2ca | 1255 | |
e8360425 JD |
1256 | status = lttng_condition_buffer_usage_get_domain_type(condition, |
1257 | &condition_domain); | |
1258 | assert(status == LTTNG_CONDITION_STATUS_OK); | |
1259 | if (channel_info->key.domain != condition_domain) { | |
ab0ee2ca JG |
1260 | goto fail; |
1261 | } | |
1262 | ||
e8360425 JD |
1263 | status = lttng_condition_buffer_usage_get_session_name( |
1264 | condition, &condition_session_name); | |
1265 | assert((status == LTTNG_CONDITION_STATUS_OK) && condition_session_name); | |
1266 | ||
1267 | status = lttng_condition_buffer_usage_get_channel_name( | |
1268 | condition, &condition_channel_name); | |
1269 | assert((status == LTTNG_CONDITION_STATUS_OK) && condition_channel_name); | |
1270 | ||
1271 | if (strcmp(channel_info->session_info->name, condition_session_name)) { | |
1272 | goto fail; | |
1273 | } | |
1274 | if (strcmp(channel_info->name, condition_channel_name)) { | |
ab0ee2ca JG |
1275 | goto fail; |
1276 | } | |
1277 | ||
e8360425 JD |
1278 | return true; |
1279 | fail: | |
1280 | return false; | |
1281 | } | |
1282 | ||
1283 | static | |
1284 | bool session_consumed_size_condition_applies_to_channel( | |
51eab943 JG |
1285 | const struct lttng_condition *condition, |
1286 | const struct channel_info *channel_info) | |
e8360425 JD |
1287 | { |
1288 | enum lttng_condition_status status; | |
1289 | const char *condition_session_name = NULL; | |
1290 | ||
1291 | status = lttng_condition_session_consumed_size_get_session_name( | |
1292 | condition, &condition_session_name); | |
1293 | assert((status == LTTNG_CONDITION_STATUS_OK) && condition_session_name); | |
1294 | ||
1295 | if (strcmp(channel_info->session_info->name, condition_session_name)) { | |
ab0ee2ca JG |
1296 | goto fail; |
1297 | } | |
1298 | ||
e8360425 JD |
1299 | return true; |
1300 | fail: | |
1301 | return false; | |
1302 | } | |
ab0ee2ca | 1303 | |
51eab943 JG |
1304 | static |
1305 | bool trigger_applies_to_channel(const struct lttng_trigger *trigger, | |
1306 | const struct channel_info *channel_info) | |
1307 | { | |
1308 | const struct lttng_condition *condition; | |
e8360425 | 1309 | bool trigger_applies; |
ab0ee2ca | 1310 | |
51eab943 | 1311 | condition = lttng_trigger_get_const_condition(trigger); |
e8360425 | 1312 | if (!condition) { |
ab0ee2ca JG |
1313 | goto fail; |
1314 | } | |
e8360425 JD |
1315 | |
1316 | switch (lttng_condition_get_type(condition)) { | |
1317 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
1318 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
1319 | trigger_applies = buffer_usage_condition_applies_to_channel( | |
1320 | condition, channel_info); | |
1321 | break; | |
1322 | case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE: | |
1323 | trigger_applies = session_consumed_size_condition_applies_to_channel( | |
1324 | condition, channel_info); | |
1325 | break; | |
1326 | default: | |
ab0ee2ca JG |
1327 | goto fail; |
1328 | } | |
1329 | ||
e8360425 | 1330 | return trigger_applies; |
ab0ee2ca JG |
1331 | fail: |
1332 | return false; | |
1333 | } | |
1334 | ||
1335 | static | |
1336 | bool trigger_applies_to_client(struct lttng_trigger *trigger, | |
1337 | struct notification_client *client) | |
1338 | { | |
1339 | bool applies = false; | |
1340 | struct lttng_condition_list_element *condition_list_element; | |
1341 | ||
1342 | cds_list_for_each_entry(condition_list_element, &client->condition_list, | |
1343 | node) { | |
1344 | applies = lttng_condition_is_equal( | |
1345 | condition_list_element->condition, | |
1346 | lttng_trigger_get_condition(trigger)); | |
1347 | if (applies) { | |
1348 | break; | |
1349 | } | |
1350 | } | |
1351 | return applies; | |
1352 | } | |
1353 | ||
ed327204 JG |
1354 | /* Must be called with RCU read lock held. */ |
1355 | static | |
1356 | struct lttng_session_trigger_list *get_session_trigger_list( | |
1357 | struct notification_thread_state *state, | |
1358 | const char *session_name) | |
1359 | { | |
1360 | struct lttng_session_trigger_list *list = NULL; | |
1361 | struct cds_lfht_node *node; | |
1362 | struct cds_lfht_iter iter; | |
1363 | ||
1364 | cds_lfht_lookup(state->session_triggers_ht, | |
1365 | hash_key_str(session_name, lttng_ht_seed), | |
1366 | match_session_trigger_list, | |
1367 | session_name, | |
1368 | &iter); | |
1369 | node = cds_lfht_iter_get_node(&iter); | |
1370 | if (!node) { | |
1371 | /* | |
1372 | * Not an error, the list of triggers applying to that session | |
1373 | * will be initialized when the session is created. | |
1374 | */ | |
1375 | DBG("[notification-thread] No trigger list found for session \"%s\" as it is not yet known to the notification system", | |
1376 | session_name); | |
1377 | goto end; | |
1378 | } | |
1379 | ||
e742b055 | 1380 | list = caa_container_of(node, |
ed327204 JG |
1381 | struct lttng_session_trigger_list, |
1382 | session_triggers_ht_node); | |
1383 | end: | |
1384 | return list; | |
1385 | } | |
1386 | ||
ea9a44f0 JG |
1387 | /* |
1388 | * Allocate an empty lttng_session_trigger_list for the session named | |
1389 | * 'session_name'. | |
1390 | * | |
1391 | * No ownership of 'session_name' is assumed by the session trigger list. | |
1392 | * It is the caller's responsability to ensure the session name is alive | |
1393 | * for as long as this list is. | |
1394 | */ | |
1395 | static | |
1396 | struct lttng_session_trigger_list *lttng_session_trigger_list_create( | |
1397 | const char *session_name, | |
1398 | struct cds_lfht *session_triggers_ht) | |
1399 | { | |
1400 | struct lttng_session_trigger_list *list; | |
1401 | ||
1402 | list = zmalloc(sizeof(*list)); | |
1403 | if (!list) { | |
1404 | goto end; | |
1405 | } | |
1406 | list->session_name = session_name; | |
1407 | CDS_INIT_LIST_HEAD(&list->list); | |
1408 | cds_lfht_node_init(&list->session_triggers_ht_node); | |
1409 | list->session_triggers_ht = session_triggers_ht; | |
1410 | ||
1411 | rcu_read_lock(); | |
1412 | /* Publish the list through the session_triggers_ht. */ | |
1413 | cds_lfht_add(session_triggers_ht, | |
1414 | hash_key_str(session_name, lttng_ht_seed), | |
1415 | &list->session_triggers_ht_node); | |
1416 | rcu_read_unlock(); | |
1417 | end: | |
1418 | return list; | |
1419 | } | |
1420 | ||
1421 | static | |
1422 | void free_session_trigger_list_rcu(struct rcu_head *node) | |
1423 | { | |
1424 | free(caa_container_of(node, struct lttng_session_trigger_list, | |
1425 | rcu_node)); | |
1426 | } | |
1427 | ||
1428 | static | |
1429 | void lttng_session_trigger_list_destroy(struct lttng_session_trigger_list *list) | |
1430 | { | |
1431 | struct lttng_trigger_list_element *trigger_list_element, *tmp; | |
1432 | ||
1433 | /* Empty the list element by element, and then free the list itself. */ | |
1434 | cds_list_for_each_entry_safe(trigger_list_element, tmp, | |
1435 | &list->list, node) { | |
1436 | cds_list_del(&trigger_list_element->node); | |
1437 | free(trigger_list_element); | |
1438 | } | |
1439 | rcu_read_lock(); | |
1440 | /* Unpublish the list from the session_triggers_ht. */ | |
1441 | cds_lfht_del(list->session_triggers_ht, | |
1442 | &list->session_triggers_ht_node); | |
1443 | rcu_read_unlock(); | |
1444 | call_rcu(&list->rcu_node, free_session_trigger_list_rcu); | |
1445 | } | |
1446 | ||
1447 | static | |
1448 | int lttng_session_trigger_list_add(struct lttng_session_trigger_list *list, | |
d1ba29d2 | 1449 | struct lttng_trigger *trigger) |
ea9a44f0 JG |
1450 | { |
1451 | int ret = 0; | |
1452 | struct lttng_trigger_list_element *new_element = | |
1453 | zmalloc(sizeof(*new_element)); | |
1454 | ||
1455 | if (!new_element) { | |
1456 | ret = -1; | |
1457 | goto end; | |
1458 | } | |
1459 | CDS_INIT_LIST_HEAD(&new_element->node); | |
1460 | new_element->trigger = trigger; | |
1461 | cds_list_add(&new_element->node, &list->list); | |
1462 | end: | |
1463 | return ret; | |
1464 | } | |
1465 | ||
1466 | static | |
1467 | bool trigger_applies_to_session(const struct lttng_trigger *trigger, | |
1468 | const char *session_name) | |
1469 | { | |
1470 | bool applies = false; | |
1471 | const struct lttng_condition *condition; | |
1472 | ||
1473 | condition = lttng_trigger_get_const_condition(trigger); | |
1474 | switch (lttng_condition_get_type(condition)) { | |
1475 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING: | |
1476 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED: | |
1477 | { | |
1478 | enum lttng_condition_status condition_status; | |
1479 | const char *condition_session_name; | |
1480 | ||
1481 | condition_status = lttng_condition_session_rotation_get_session_name( | |
1482 | condition, &condition_session_name); | |
1483 | if (condition_status != LTTNG_CONDITION_STATUS_OK) { | |
1484 | ERR("[notification-thread] Failed to retrieve session rotation condition's session name"); | |
1485 | goto end; | |
1486 | } | |
1487 | ||
1488 | assert(condition_session_name); | |
1489 | applies = !strcmp(condition_session_name, session_name); | |
1490 | break; | |
1491 | } | |
1492 | default: | |
1493 | goto end; | |
1494 | } | |
1495 | end: | |
1496 | return applies; | |
1497 | } | |
1498 | ||
1499 | /* | |
1500 | * Allocate and initialize an lttng_session_trigger_list which contains | |
1501 | * all triggers that apply to the session named 'session_name'. | |
1502 | * | |
1503 | * No ownership of 'session_name' is assumed by the session trigger list. | |
1504 | * It is the caller's responsability to ensure the session name is alive | |
1505 | * for as long as this list is. | |
1506 | */ | |
1507 | static | |
1508 | struct lttng_session_trigger_list *lttng_session_trigger_list_build( | |
1509 | const struct notification_thread_state *state, | |
1510 | const char *session_name) | |
1511 | { | |
1512 | int trigger_count = 0; | |
1513 | struct lttng_session_trigger_list *session_trigger_list = NULL; | |
1514 | struct lttng_trigger_ht_element *trigger_ht_element = NULL; | |
1515 | struct cds_lfht_iter iter; | |
1516 | ||
1517 | session_trigger_list = lttng_session_trigger_list_create(session_name, | |
1518 | state->session_triggers_ht); | |
1519 | ||
1520 | /* Add all triggers applying to the session named 'session_name'. */ | |
1521 | cds_lfht_for_each_entry(state->triggers_ht, &iter, trigger_ht_element, | |
1522 | node) { | |
1523 | int ret; | |
1524 | ||
1525 | if (!trigger_applies_to_session(trigger_ht_element->trigger, | |
1526 | session_name)) { | |
1527 | continue; | |
1528 | } | |
1529 | ||
1530 | ret = lttng_session_trigger_list_add(session_trigger_list, | |
1531 | trigger_ht_element->trigger); | |
1532 | if (ret) { | |
1533 | goto error; | |
1534 | } | |
1535 | ||
1536 | trigger_count++; | |
1537 | } | |
1538 | ||
1539 | DBG("[notification-thread] Found %i triggers that apply to newly created session", | |
1540 | trigger_count); | |
1541 | return session_trigger_list; | |
1542 | error: | |
1543 | lttng_session_trigger_list_destroy(session_trigger_list); | |
1544 | return NULL; | |
1545 | } | |
1546 | ||
8abe313a JG |
1547 | static |
1548 | struct session_info *find_or_create_session_info( | |
1549 | struct notification_thread_state *state, | |
1550 | const char *name, uid_t uid, gid_t gid) | |
1551 | { | |
1552 | struct session_info *session = NULL; | |
1553 | struct cds_lfht_node *node; | |
1554 | struct cds_lfht_iter iter; | |
ea9a44f0 | 1555 | struct lttng_session_trigger_list *trigger_list; |
8abe313a JG |
1556 | |
1557 | rcu_read_lock(); | |
1558 | cds_lfht_lookup(state->sessions_ht, | |
1559 | hash_key_str(name, lttng_ht_seed), | |
1560 | match_session, | |
1561 | name, | |
1562 | &iter); | |
1563 | node = cds_lfht_iter_get_node(&iter); | |
1564 | if (node) { | |
1565 | DBG("[notification-thread] Found session info of session \"%s\" (uid = %i, gid = %i)", | |
1566 | name, uid, gid); | |
1567 | session = caa_container_of(node, struct session_info, | |
1568 | sessions_ht_node); | |
1569 | assert(session->uid == uid); | |
1570 | assert(session->gid == gid); | |
1eee26c5 JG |
1571 | session_info_get(session); |
1572 | goto end; | |
ea9a44f0 JG |
1573 | } |
1574 | ||
1575 | trigger_list = lttng_session_trigger_list_build(state, name); | |
1576 | if (!trigger_list) { | |
1577 | goto error; | |
8abe313a JG |
1578 | } |
1579 | ||
1eee26c5 JG |
1580 | session = session_info_create(name, uid, gid, trigger_list, |
1581 | state->sessions_ht); | |
8abe313a JG |
1582 | if (!session) { |
1583 | ERR("[notification-thread] Failed to allocation session info for session \"%s\" (uid = %i, gid = %i)", | |
1584 | name, uid, gid); | |
b248644d | 1585 | lttng_session_trigger_list_destroy(trigger_list); |
ea9a44f0 | 1586 | goto error; |
8abe313a | 1587 | } |
ea9a44f0 | 1588 | trigger_list = NULL; |
577983cb JG |
1589 | |
1590 | cds_lfht_add(state->sessions_ht, hash_key_str(name, lttng_ht_seed), | |
9b63a4aa | 1591 | &session->sessions_ht_node); |
1eee26c5 | 1592 | end: |
8abe313a JG |
1593 | rcu_read_unlock(); |
1594 | return session; | |
ea9a44f0 JG |
1595 | error: |
1596 | rcu_read_unlock(); | |
1597 | session_info_put(session); | |
1598 | return NULL; | |
8abe313a JG |
1599 | } |
1600 | ||
ab0ee2ca JG |
1601 | static |
1602 | int handle_notification_thread_command_add_channel( | |
8abe313a JG |
1603 | struct notification_thread_state *state, |
1604 | const char *session_name, uid_t session_uid, gid_t session_gid, | |
1605 | const char *channel_name, enum lttng_domain_type channel_domain, | |
1606 | uint64_t channel_key_int, uint64_t channel_capacity, | |
1607 | enum lttng_error_code *cmd_result) | |
ab0ee2ca JG |
1608 | { |
1609 | struct cds_list_head trigger_list; | |
8abe313a JG |
1610 | struct channel_info *new_channel_info = NULL; |
1611 | struct channel_key channel_key = { | |
1612 | .key = channel_key_int, | |
1613 | .domain = channel_domain, | |
1614 | }; | |
ab0ee2ca JG |
1615 | struct lttng_channel_trigger_list *channel_trigger_list = NULL; |
1616 | struct lttng_trigger_ht_element *trigger_ht_element = NULL; | |
1617 | int trigger_count = 0; | |
1618 | struct cds_lfht_iter iter; | |
8abe313a | 1619 | struct session_info *session_info = NULL; |
ab0ee2ca JG |
1620 | |
1621 | DBG("[notification-thread] Adding channel %s from session %s, channel key = %" PRIu64 " in %s domain", | |
8abe313a JG |
1622 | channel_name, session_name, channel_key_int, |
1623 | channel_domain == LTTNG_DOMAIN_KERNEL ? "kernel" : "user space"); | |
ab0ee2ca JG |
1624 | |
1625 | CDS_INIT_LIST_HEAD(&trigger_list); | |
1626 | ||
8abe313a JG |
1627 | session_info = find_or_create_session_info(state, session_name, |
1628 | session_uid, session_gid); | |
1629 | if (!session_info) { | |
a9577b76 | 1630 | /* Allocation error or an internal error occurred. */ |
ab0ee2ca JG |
1631 | goto error; |
1632 | } | |
1633 | ||
8abe313a JG |
1634 | new_channel_info = channel_info_create(channel_name, &channel_key, |
1635 | channel_capacity, session_info); | |
1636 | if (!new_channel_info) { | |
1637 | goto error; | |
1638 | } | |
ab0ee2ca | 1639 | |
83b934ad | 1640 | rcu_read_lock(); |
ab0ee2ca JG |
1641 | /* Build a list of all triggers applying to the new channel. */ |
1642 | cds_lfht_for_each_entry(state->triggers_ht, &iter, trigger_ht_element, | |
1643 | node) { | |
1644 | struct lttng_trigger_list_element *new_element; | |
1645 | ||
1646 | if (!trigger_applies_to_channel(trigger_ht_element->trigger, | |
8abe313a | 1647 | new_channel_info)) { |
ab0ee2ca JG |
1648 | continue; |
1649 | } | |
1650 | ||
1651 | new_element = zmalloc(sizeof(*new_element)); | |
1652 | if (!new_element) { | |
83b934ad | 1653 | rcu_read_unlock(); |
ab0ee2ca JG |
1654 | goto error; |
1655 | } | |
1656 | CDS_INIT_LIST_HEAD(&new_element->node); | |
1657 | new_element->trigger = trigger_ht_element->trigger; | |
1658 | cds_list_add(&new_element->node, &trigger_list); | |
1659 | trigger_count++; | |
1660 | } | |
83b934ad | 1661 | rcu_read_unlock(); |
ab0ee2ca JG |
1662 | |
1663 | DBG("[notification-thread] Found %i triggers that apply to newly added channel", | |
1664 | trigger_count); | |
1665 | channel_trigger_list = zmalloc(sizeof(*channel_trigger_list)); | |
1666 | if (!channel_trigger_list) { | |
1667 | goto error; | |
1668 | } | |
8abe313a | 1669 | channel_trigger_list->channel_key = new_channel_info->key; |
ab0ee2ca JG |
1670 | CDS_INIT_LIST_HEAD(&channel_trigger_list->list); |
1671 | cds_lfht_node_init(&channel_trigger_list->channel_triggers_ht_node); | |
1672 | cds_list_splice(&trigger_list, &channel_trigger_list->list); | |
1673 | ||
1674 | rcu_read_lock(); | |
1675 | /* Add channel to the channel_ht which owns the channel_infos. */ | |
1676 | cds_lfht_add(state->channels_ht, | |
8abe313a | 1677 | hash_channel_key(&new_channel_info->key), |
ab0ee2ca JG |
1678 | &new_channel_info->channels_ht_node); |
1679 | /* | |
1680 | * Add the list of triggers associated with this channel to the | |
1681 | * channel_triggers_ht. | |
1682 | */ | |
1683 | cds_lfht_add(state->channel_triggers_ht, | |
8abe313a | 1684 | hash_channel_key(&new_channel_info->key), |
ab0ee2ca JG |
1685 | &channel_trigger_list->channel_triggers_ht_node); |
1686 | rcu_read_unlock(); | |
1eee26c5 | 1687 | session_info_put(session_info); |
ab0ee2ca JG |
1688 | *cmd_result = LTTNG_OK; |
1689 | return 0; | |
1690 | error: | |
ab0ee2ca | 1691 | channel_info_destroy(new_channel_info); |
8abe313a | 1692 | session_info_put(session_info); |
ab0ee2ca JG |
1693 | return 1; |
1694 | } | |
1695 | ||
83b934ad MD |
1696 | static |
1697 | void free_channel_trigger_list_rcu(struct rcu_head *node) | |
1698 | { | |
1699 | free(caa_container_of(node, struct lttng_channel_trigger_list, | |
1700 | rcu_node)); | |
1701 | } | |
1702 | ||
1703 | static | |
1704 | void free_channel_state_sample_rcu(struct rcu_head *node) | |
1705 | { | |
1706 | free(caa_container_of(node, struct channel_state_sample, | |
1707 | rcu_node)); | |
1708 | } | |
1709 | ||
ab0ee2ca JG |
1710 | static |
1711 | int handle_notification_thread_command_remove_channel( | |
1712 | struct notification_thread_state *state, | |
1713 | uint64_t channel_key, enum lttng_domain_type domain, | |
1714 | enum lttng_error_code *cmd_result) | |
1715 | { | |
1716 | struct cds_lfht_node *node; | |
1717 | struct cds_lfht_iter iter; | |
1718 | struct lttng_channel_trigger_list *trigger_list; | |
1719 | struct lttng_trigger_list_element *trigger_list_element, *tmp; | |
1720 | struct channel_key key = { .key = channel_key, .domain = domain }; | |
1721 | struct channel_info *channel_info; | |
1722 | ||
1723 | DBG("[notification-thread] Removing channel key = %" PRIu64 " in %s domain", | |
1724 | channel_key, domain == LTTNG_DOMAIN_KERNEL ? "kernel" : "user space"); | |
1725 | ||
1726 | rcu_read_lock(); | |
1727 | ||
1728 | cds_lfht_lookup(state->channel_triggers_ht, | |
1729 | hash_channel_key(&key), | |
1730 | match_channel_trigger_list, | |
1731 | &key, | |
1732 | &iter); | |
1733 | node = cds_lfht_iter_get_node(&iter); | |
1734 | /* | |
1735 | * There is a severe internal error if we are being asked to remove a | |
1736 | * channel that doesn't exist. | |
1737 | */ | |
1738 | if (!node) { | |
1739 | ERR("[notification-thread] Channel being removed is unknown to the notification thread"); | |
1740 | goto end; | |
1741 | } | |
1742 | ||
1743 | /* Free the list of triggers associated with this channel. */ | |
1744 | trigger_list = caa_container_of(node, struct lttng_channel_trigger_list, | |
1745 | channel_triggers_ht_node); | |
1746 | cds_list_for_each_entry_safe(trigger_list_element, tmp, | |
1747 | &trigger_list->list, node) { | |
1748 | cds_list_del(&trigger_list_element->node); | |
1749 | free(trigger_list_element); | |
1750 | } | |
1751 | cds_lfht_del(state->channel_triggers_ht, node); | |
83b934ad | 1752 | call_rcu(&trigger_list->rcu_node, free_channel_trigger_list_rcu); |
ab0ee2ca JG |
1753 | |
1754 | /* Free sampled channel state. */ | |
1755 | cds_lfht_lookup(state->channel_state_ht, | |
1756 | hash_channel_key(&key), | |
1757 | match_channel_state_sample, | |
1758 | &key, | |
1759 | &iter); | |
1760 | node = cds_lfht_iter_get_node(&iter); | |
1761 | /* | |
1762 | * This is expected to be NULL if the channel is destroyed before we | |
1763 | * received a sample. | |
1764 | */ | |
1765 | if (node) { | |
1766 | struct channel_state_sample *sample = caa_container_of(node, | |
1767 | struct channel_state_sample, | |
1768 | channel_state_ht_node); | |
1769 | ||
1770 | cds_lfht_del(state->channel_state_ht, node); | |
83b934ad | 1771 | call_rcu(&sample->rcu_node, free_channel_state_sample_rcu); |
ab0ee2ca JG |
1772 | } |
1773 | ||
1774 | /* Remove the channel from the channels_ht and free it. */ | |
1775 | cds_lfht_lookup(state->channels_ht, | |
1776 | hash_channel_key(&key), | |
1777 | match_channel_info, | |
1778 | &key, | |
1779 | &iter); | |
1780 | node = cds_lfht_iter_get_node(&iter); | |
1781 | assert(node); | |
1782 | channel_info = caa_container_of(node, struct channel_info, | |
1783 | channels_ht_node); | |
1784 | cds_lfht_del(state->channels_ht, node); | |
1785 | channel_info_destroy(channel_info); | |
1786 | end: | |
1787 | rcu_read_unlock(); | |
1788 | *cmd_result = LTTNG_OK; | |
1789 | return 0; | |
1790 | } | |
1791 | ||
0ca52944 | 1792 | static |
ed327204 | 1793 | int handle_notification_thread_command_session_rotation( |
0ca52944 | 1794 | struct notification_thread_state *state, |
ed327204 JG |
1795 | enum notification_thread_command_type cmd_type, |
1796 | const char *session_name, uid_t session_uid, gid_t session_gid, | |
1797 | uint64_t trace_archive_chunk_id, | |
1798 | struct lttng_trace_archive_location *location, | |
1799 | enum lttng_error_code *_cmd_result) | |
0ca52944 | 1800 | { |
ed327204 JG |
1801 | int ret = 0; |
1802 | enum lttng_error_code cmd_result = LTTNG_OK; | |
1803 | struct lttng_session_trigger_list *trigger_list; | |
1804 | struct lttng_trigger_list_element *trigger_list_element; | |
1805 | struct session_info *session_info; | |
d1ba29d2 JG |
1806 | const struct lttng_credentials session_creds = { |
1807 | .uid = session_uid, | |
1808 | .gid = session_gid, | |
1809 | }; | |
0ca52944 | 1810 | |
ed327204 JG |
1811 | rcu_read_lock(); |
1812 | ||
1813 | session_info = find_or_create_session_info(state, session_name, | |
1814 | session_uid, session_gid); | |
1815 | if (!session_info) { | |
a9577b76 | 1816 | /* Allocation error or an internal error occurred. */ |
ed327204 JG |
1817 | ret = -1; |
1818 | cmd_result = LTTNG_ERR_NOMEM; | |
1819 | goto end; | |
1820 | } | |
1821 | ||
1822 | session_info->rotation.ongoing = | |
1823 | cmd_type == NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_ONGOING; | |
1824 | session_info->rotation.id = trace_archive_chunk_id; | |
1825 | trigger_list = get_session_trigger_list(state, session_name); | |
1826 | if (!trigger_list) { | |
1827 | DBG("[notification-thread] No triggers applying to session \"%s\" found", | |
1828 | session_name); | |
1829 | goto end; | |
1830 | } | |
1831 | ||
1832 | cds_list_for_each_entry(trigger_list_element, &trigger_list->list, | |
1833 | node) { | |
1834 | const struct lttng_condition *condition; | |
1835 | const struct lttng_action *action; | |
d1ba29d2 | 1836 | struct lttng_trigger *trigger; |
ed327204 JG |
1837 | struct notification_client_list *client_list; |
1838 | struct lttng_evaluation *evaluation = NULL; | |
1839 | enum lttng_condition_type condition_type; | |
505b2d90 | 1840 | bool client_list_is_empty; |
d1ba29d2 | 1841 | enum action_executor_status executor_status; |
ed327204 JG |
1842 | |
1843 | trigger = trigger_list_element->trigger; | |
1844 | condition = lttng_trigger_get_const_condition(trigger); | |
1845 | assert(condition); | |
1846 | condition_type = lttng_condition_get_type(condition); | |
1847 | ||
1848 | if (condition_type == LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING && | |
1849 | cmd_type != NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_ONGOING) { | |
1850 | continue; | |
1851 | } else if (condition_type == LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED && | |
1852 | cmd_type != NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_COMPLETED) { | |
1853 | continue; | |
1854 | } | |
1855 | ||
1856 | action = lttng_trigger_get_const_action(trigger); | |
1857 | ||
1858 | /* Notify actions are the only type currently supported. */ | |
1859 | assert(lttng_action_get_type_const(action) == | |
1860 | LTTNG_ACTION_TYPE_NOTIFY); | |
1861 | ||
1862 | client_list = get_client_list_from_condition(state, condition); | |
1863 | assert(client_list); | |
1864 | ||
505b2d90 JG |
1865 | pthread_mutex_lock(&client_list->lock); |
1866 | client_list_is_empty = cds_list_empty(&client_list->list); | |
1867 | pthread_mutex_unlock(&client_list->lock); | |
1868 | if (client_list_is_empty) { | |
ed327204 JG |
1869 | /* |
1870 | * No clients interested in the evaluation's result, | |
1871 | * skip it. | |
1872 | */ | |
1873 | continue; | |
1874 | } | |
1875 | ||
1876 | if (cmd_type == NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_ONGOING) { | |
1877 | evaluation = lttng_evaluation_session_rotation_ongoing_create( | |
1878 | trace_archive_chunk_id); | |
1879 | } else { | |
1880 | evaluation = lttng_evaluation_session_rotation_completed_create( | |
1881 | trace_archive_chunk_id, location); | |
1882 | } | |
1883 | ||
1884 | if (!evaluation) { | |
1885 | /* Internal error */ | |
1886 | ret = -1; | |
1887 | cmd_result = LTTNG_ERR_UNK; | |
505b2d90 | 1888 | goto put_list; |
ed327204 JG |
1889 | } |
1890 | ||
d1ba29d2 JG |
1891 | /* |
1892 | * Ownership of `evaluation` transferred to the action executor | |
1893 | * no matter the result. | |
1894 | */ | |
1895 | executor_status = action_executor_enqueue(state->executor, | |
1896 | trigger, evaluation, &session_creds, | |
1897 | client_list); | |
1898 | evaluation = NULL; | |
1899 | switch (executor_status) { | |
1900 | case ACTION_EXECUTOR_STATUS_OK: | |
1901 | break; | |
1902 | case ACTION_EXECUTOR_STATUS_ERROR: | |
1903 | case ACTION_EXECUTOR_STATUS_INVALID: | |
1904 | /* | |
1905 | * TODO Add trigger identification (name/id) when | |
1906 | * it is added to the API. | |
1907 | */ | |
1908 | ERR("Fatal error occurred while enqueuing action associated with session rotation trigger"); | |
1909 | ret = -1; | |
1910 | goto put_list; | |
1911 | case ACTION_EXECUTOR_STATUS_OVERFLOW: | |
1912 | /* | |
1913 | * TODO Add trigger identification (name/id) when | |
1914 | * it is added to the API. | |
1915 | * | |
1916 | * Not a fatal error. | |
1917 | */ | |
1918 | WARN("No space left when enqueuing action associated with session rotation trigger"); | |
1919 | ret = 0; | |
1920 | goto put_list; | |
1921 | default: | |
1922 | abort(); | |
1923 | } | |
1924 | ||
505b2d90 JG |
1925 | put_list: |
1926 | notification_client_list_put(client_list); | |
ed327204 | 1927 | if (caa_unlikely(ret)) { |
505b2d90 | 1928 | break; |
ed327204 JG |
1929 | } |
1930 | } | |
1931 | end: | |
1932 | session_info_put(session_info); | |
1933 | *_cmd_result = cmd_result; | |
1934 | rcu_read_unlock(); | |
1935 | return ret; | |
0ca52944 JG |
1936 | } |
1937 | ||
1da26331 JG |
1938 | static |
1939 | int condition_is_supported(struct lttng_condition *condition) | |
1940 | { | |
1941 | int ret; | |
1942 | ||
1943 | switch (lttng_condition_get_type(condition)) { | |
1944 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
1945 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
1946 | { | |
1947 | enum lttng_domain_type domain; | |
1948 | ||
1949 | ret = lttng_condition_buffer_usage_get_domain_type(condition, | |
1950 | &domain); | |
1951 | if (ret) { | |
1952 | ret = -1; | |
1953 | goto end; | |
1954 | } | |
1955 | ||
1956 | if (domain != LTTNG_DOMAIN_KERNEL) { | |
1957 | ret = 1; | |
1958 | goto end; | |
1959 | } | |
1960 | ||
1961 | /* | |
1962 | * Older kernel tracers don't expose the API to monitor their | |
1963 | * buffers. Therefore, we reject triggers that require that | |
1964 | * mechanism to be available to be evaluated. | |
1965 | */ | |
7d268848 | 1966 | ret = kernel_supports_ring_buffer_snapshot_sample_positions(); |
1da26331 JG |
1967 | break; |
1968 | } | |
1969 | default: | |
1970 | ret = 1; | |
1971 | } | |
1972 | end: | |
1973 | return ret; | |
1974 | } | |
1975 | ||
51eab943 JG |
1976 | /* Must be called with RCU read lock held. */ |
1977 | static | |
d1ba29d2 | 1978 | int bind_trigger_to_matching_session(struct lttng_trigger *trigger, |
51eab943 JG |
1979 | struct notification_thread_state *state) |
1980 | { | |
1981 | int ret = 0; | |
51eab943 JG |
1982 | const struct lttng_condition *condition; |
1983 | const char *session_name; | |
1984 | struct lttng_session_trigger_list *trigger_list; | |
1985 | ||
1986 | condition = lttng_trigger_get_const_condition(trigger); | |
1987 | switch (lttng_condition_get_type(condition)) { | |
1988 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING: | |
1989 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED: | |
1990 | { | |
1991 | enum lttng_condition_status status; | |
1992 | ||
1993 | status = lttng_condition_session_rotation_get_session_name( | |
1994 | condition, &session_name); | |
1995 | if (status != LTTNG_CONDITION_STATUS_OK) { | |
1996 | ERR("[notification-thread] Failed to bind trigger to session: unable to get 'session_rotation' condition's session name"); | |
1997 | ret = -1; | |
1998 | goto end; | |
1999 | } | |
2000 | break; | |
2001 | } | |
2002 | default: | |
2003 | ret = -1; | |
2004 | goto end; | |
2005 | } | |
2006 | ||
ed327204 JG |
2007 | trigger_list = get_session_trigger_list(state, session_name); |
2008 | if (!trigger_list) { | |
51eab943 JG |
2009 | DBG("[notification-thread] Unable to bind trigger applying to session \"%s\" as it is not yet known to the notification system", |
2010 | session_name); | |
2011 | goto end; | |
51eab943 | 2012 | |
ed327204 | 2013 | } |
51eab943 JG |
2014 | |
2015 | DBG("[notification-thread] Newly registered trigger bound to session \"%s\"", | |
2016 | session_name); | |
2017 | ret = lttng_session_trigger_list_add(trigger_list, trigger); | |
2018 | end: | |
2019 | return ret; | |
2020 | } | |
2021 | ||
2022 | /* Must be called with RCU read lock held. */ | |
2023 | static | |
d1ba29d2 | 2024 | int bind_trigger_to_matching_channels(struct lttng_trigger *trigger, |
51eab943 JG |
2025 | struct notification_thread_state *state) |
2026 | { | |
2027 | int ret = 0; | |
2028 | struct cds_lfht_node *node; | |
2029 | struct cds_lfht_iter iter; | |
2030 | struct channel_info *channel; | |
2031 | ||
2032 | cds_lfht_for_each_entry(state->channels_ht, &iter, channel, | |
2033 | channels_ht_node) { | |
2034 | struct lttng_trigger_list_element *trigger_list_element; | |
2035 | struct lttng_channel_trigger_list *trigger_list; | |
a5d64ae7 | 2036 | struct cds_lfht_iter lookup_iter; |
51eab943 JG |
2037 | |
2038 | if (!trigger_applies_to_channel(trigger, channel)) { | |
2039 | continue; | |
2040 | } | |
2041 | ||
2042 | cds_lfht_lookup(state->channel_triggers_ht, | |
2043 | hash_channel_key(&channel->key), | |
2044 | match_channel_trigger_list, | |
2045 | &channel->key, | |
a5d64ae7 MD |
2046 | &lookup_iter); |
2047 | node = cds_lfht_iter_get_node(&lookup_iter); | |
51eab943 JG |
2048 | assert(node); |
2049 | trigger_list = caa_container_of(node, | |
2050 | struct lttng_channel_trigger_list, | |
2051 | channel_triggers_ht_node); | |
2052 | ||
2053 | trigger_list_element = zmalloc(sizeof(*trigger_list_element)); | |
2054 | if (!trigger_list_element) { | |
2055 | ret = -1; | |
2056 | goto end; | |
2057 | } | |
2058 | CDS_INIT_LIST_HEAD(&trigger_list_element->node); | |
2059 | trigger_list_element->trigger = trigger; | |
2060 | cds_list_add(&trigger_list_element->node, &trigger_list->list); | |
2061 | DBG("[notification-thread] Newly registered trigger bound to channel \"%s\"", | |
2062 | channel->name); | |
2063 | } | |
2064 | end: | |
2065 | return ret; | |
2066 | } | |
2067 | ||
ab0ee2ca JG |
2068 | /* |
2069 | * FIXME A client's credentials are not checked when registering a trigger, nor | |
2070 | * are they stored alongside with the trigger. | |
2071 | * | |
1da26331 | 2072 | * The effects of this are benign since: |
ab0ee2ca | 2073 | * - The client will succeed in registering the trigger, as it is valid, |
51eab943 | 2074 | * - The trigger will, internally, be bound to the channel/session, |
ab0ee2ca JG |
2075 | * - The notifications will not be sent since the client's credentials |
2076 | * are checked against the channel at that moment. | |
1da26331 JG |
2077 | * |
2078 | * If this function returns a non-zero value, it means something is | |
50ca7858 | 2079 | * fundamentally broken and the whole subsystem/thread will be torn down. |
1da26331 JG |
2080 | * |
2081 | * If a non-fatal error occurs, just set the cmd_result to the appropriate | |
2082 | * error code. | |
ab0ee2ca JG |
2083 | */ |
2084 | static | |
2085 | int handle_notification_thread_command_register_trigger( | |
8abe313a JG |
2086 | struct notification_thread_state *state, |
2087 | struct lttng_trigger *trigger, | |
2088 | enum lttng_error_code *cmd_result) | |
ab0ee2ca JG |
2089 | { |
2090 | int ret = 0; | |
2091 | struct lttng_condition *condition; | |
2092 | struct notification_client *client; | |
2093 | struct notification_client_list *client_list = NULL; | |
2094 | struct lttng_trigger_ht_element *trigger_ht_element = NULL; | |
2095 | struct notification_client_list_element *client_list_element, *tmp; | |
2096 | struct cds_lfht_node *node; | |
2097 | struct cds_lfht_iter iter; | |
ab0ee2ca JG |
2098 | bool free_trigger = true; |
2099 | ||
2100 | rcu_read_lock(); | |
2101 | ||
2102 | condition = lttng_trigger_get_condition(trigger); | |
1da26331 JG |
2103 | assert(condition); |
2104 | ||
2105 | ret = condition_is_supported(condition); | |
2106 | if (ret < 0) { | |
2107 | goto error; | |
2108 | } else if (ret == 0) { | |
2109 | *cmd_result = LTTNG_ERR_NOT_SUPPORTED; | |
2110 | goto error; | |
2111 | } else { | |
2112 | /* Feature is supported, continue. */ | |
2113 | ret = 0; | |
2114 | } | |
2115 | ||
ab0ee2ca JG |
2116 | trigger_ht_element = zmalloc(sizeof(*trigger_ht_element)); |
2117 | if (!trigger_ht_element) { | |
2118 | ret = -1; | |
2119 | goto error; | |
2120 | } | |
2121 | ||
2122 | /* Add trigger to the trigger_ht. */ | |
2123 | cds_lfht_node_init(&trigger_ht_element->node); | |
2124 | trigger_ht_element->trigger = trigger; | |
2125 | ||
2126 | node = cds_lfht_add_unique(state->triggers_ht, | |
2127 | lttng_condition_hash(condition), | |
2128 | match_condition, | |
2129 | condition, | |
2130 | &trigger_ht_element->node); | |
2131 | if (node != &trigger_ht_element->node) { | |
2132 | /* Not a fatal error, simply report it to the client. */ | |
2133 | *cmd_result = LTTNG_ERR_TRIGGER_EXISTS; | |
2134 | goto error_free_ht_element; | |
2135 | } | |
2136 | ||
2137 | /* | |
2138 | * Ownership of the trigger and of its wrapper was transfered to | |
2139 | * the triggers_ht. | |
2140 | */ | |
2141 | trigger_ht_element = NULL; | |
2142 | free_trigger = false; | |
2143 | ||
2144 | /* | |
2145 | * The rest only applies to triggers that have a "notify" action. | |
2146 | * It is not skipped as this is the only action type currently | |
2147 | * supported. | |
2148 | */ | |
505b2d90 | 2149 | client_list = notification_client_list_create(trigger); |
ab0ee2ca JG |
2150 | if (!client_list) { |
2151 | ret = -1; | |
2152 | goto error_free_ht_element; | |
2153 | } | |
ab0ee2ca JG |
2154 | |
2155 | /* Build a list of clients to which this new trigger applies. */ | |
2156 | cds_lfht_for_each_entry(state->client_socket_ht, &iter, client, | |
2157 | client_socket_ht_node) { | |
2158 | if (!trigger_applies_to_client(trigger, client)) { | |
2159 | continue; | |
2160 | } | |
2161 | ||
2162 | client_list_element = zmalloc(sizeof(*client_list_element)); | |
2163 | if (!client_list_element) { | |
2164 | ret = -1; | |
505b2d90 | 2165 | goto error_put_client_list; |
ab0ee2ca JG |
2166 | } |
2167 | CDS_INIT_LIST_HEAD(&client_list_element->node); | |
2168 | client_list_element->client = client; | |
2169 | cds_list_add(&client_list_element->node, &client_list->list); | |
2170 | } | |
2171 | ||
f82f93a1 | 2172 | switch (get_condition_binding_object(condition)) { |
51eab943 JG |
2173 | case LTTNG_OBJECT_TYPE_SESSION: |
2174 | /* Add the trigger to the list if it matches a known session. */ | |
2175 | ret = bind_trigger_to_matching_session(trigger, state); | |
2176 | if (ret) { | |
505b2d90 | 2177 | goto error_put_client_list; |
ab0ee2ca | 2178 | } |
f82f93a1 | 2179 | break; |
51eab943 JG |
2180 | case LTTNG_OBJECT_TYPE_CHANNEL: |
2181 | /* | |
2182 | * Add the trigger to list of triggers bound to the channels | |
2183 | * currently known. | |
2184 | */ | |
2185 | ret = bind_trigger_to_matching_channels(trigger, state); | |
2186 | if (ret) { | |
505b2d90 | 2187 | goto error_put_client_list; |
ab0ee2ca | 2188 | } |
51eab943 JG |
2189 | break; |
2190 | case LTTNG_OBJECT_TYPE_NONE: | |
2191 | break; | |
2192 | default: | |
2193 | ERR("[notification-thread] Unknown object type on which to bind a newly registered trigger was encountered"); | |
2194 | ret = -1; | |
505b2d90 | 2195 | goto error_put_client_list; |
ab0ee2ca JG |
2196 | } |
2197 | ||
2ae99f0b JG |
2198 | /* |
2199 | * Since there is nothing preventing clients from subscribing to a | |
2200 | * condition before the corresponding trigger is registered, we have | |
2201 | * to evaluate this new condition right away. | |
2202 | * | |
2203 | * At some point, we were waiting for the next "evaluation" (e.g. on | |
2204 | * reception of a channel sample) to evaluate this new condition, but | |
2205 | * that was broken. | |
2206 | * | |
2207 | * The reason it was broken is that waiting for the next sample | |
2208 | * does not allow us to properly handle transitions for edge-triggered | |
2209 | * conditions. | |
2210 | * | |
2211 | * Consider this example: when we handle a new channel sample, we | |
2212 | * evaluate each conditions twice: once with the previous state, and | |
2213 | * again with the newest state. We then use those two results to | |
2214 | * determine whether a state change happened: a condition was false and | |
2215 | * became true. If a state change happened, we have to notify clients. | |
2216 | * | |
2217 | * Now, if a client subscribes to a given notification and registers | |
2218 | * a trigger *after* that subscription, we have to make sure the | |
2219 | * condition is evaluated at this point while considering only the | |
2220 | * current state. Otherwise, the next evaluation cycle may only see | |
2221 | * that the evaluations remain the same (true for samples n-1 and n) and | |
2222 | * the client will never know that the condition has been met. | |
505b2d90 JG |
2223 | * |
2224 | * No need to lock the list here as it has not been published yet. | |
2ae99f0b JG |
2225 | */ |
2226 | cds_list_for_each_entry_safe(client_list_element, tmp, | |
2227 | &client_list->list, node) { | |
2228 | ret = evaluate_condition_for_client(trigger, condition, | |
2229 | client_list_element->client, state); | |
2230 | if (ret) { | |
505b2d90 | 2231 | goto error_put_client_list; |
2ae99f0b JG |
2232 | } |
2233 | } | |
2234 | ||
2235 | /* | |
2236 | * Client list ownership transferred to the | |
2237 | * notification_trigger_clients_ht. | |
2238 | */ | |
505b2d90 | 2239 | publish_notification_client_list(state, client_list); |
2ae99f0b JG |
2240 | client_list = NULL; |
2241 | ||
ab0ee2ca | 2242 | *cmd_result = LTTNG_OK; |
505b2d90 JG |
2243 | |
2244 | error_put_client_list: | |
2245 | notification_client_list_put(client_list); | |
2246 | ||
ab0ee2ca JG |
2247 | error_free_ht_element: |
2248 | free(trigger_ht_element); | |
2249 | error: | |
2250 | if (free_trigger) { | |
ab0ee2ca JG |
2251 | lttng_trigger_destroy(trigger); |
2252 | } | |
2253 | rcu_read_unlock(); | |
2254 | return ret; | |
2255 | } | |
2256 | ||
83b934ad MD |
2257 | static |
2258 | void free_lttng_trigger_ht_element_rcu(struct rcu_head *node) | |
2259 | { | |
2260 | free(caa_container_of(node, struct lttng_trigger_ht_element, | |
2261 | rcu_node)); | |
2262 | } | |
2263 | ||
cc2295b5 | 2264 | static |
ab0ee2ca JG |
2265 | int handle_notification_thread_command_unregister_trigger( |
2266 | struct notification_thread_state *state, | |
2267 | struct lttng_trigger *trigger, | |
2268 | enum lttng_error_code *_cmd_reply) | |
2269 | { | |
2270 | struct cds_lfht_iter iter; | |
ed327204 | 2271 | struct cds_lfht_node *triggers_ht_node; |
ab0ee2ca JG |
2272 | struct lttng_channel_trigger_list *trigger_list; |
2273 | struct notification_client_list *client_list; | |
ab0ee2ca JG |
2274 | struct lttng_trigger_ht_element *trigger_ht_element = NULL; |
2275 | struct lttng_condition *condition = lttng_trigger_get_condition( | |
2276 | trigger); | |
ab0ee2ca JG |
2277 | enum lttng_error_code cmd_reply; |
2278 | ||
2279 | rcu_read_lock(); | |
2280 | ||
2281 | cds_lfht_lookup(state->triggers_ht, | |
2282 | lttng_condition_hash(condition), | |
2283 | match_condition, | |
2284 | condition, | |
2285 | &iter); | |
2286 | triggers_ht_node = cds_lfht_iter_get_node(&iter); | |
2287 | if (!triggers_ht_node) { | |
2288 | cmd_reply = LTTNG_ERR_TRIGGER_NOT_FOUND; | |
2289 | goto end; | |
2290 | } else { | |
2291 | cmd_reply = LTTNG_OK; | |
2292 | } | |
2293 | ||
2294 | /* Remove trigger from channel_triggers_ht. */ | |
2295 | cds_lfht_for_each_entry(state->channel_triggers_ht, &iter, trigger_list, | |
2296 | channel_triggers_ht_node) { | |
2297 | struct lttng_trigger_list_element *trigger_element, *tmp; | |
2298 | ||
2299 | cds_list_for_each_entry_safe(trigger_element, tmp, | |
2300 | &trigger_list->list, node) { | |
9b63a4aa JG |
2301 | const struct lttng_condition *current_condition = |
2302 | lttng_trigger_get_const_condition( | |
ab0ee2ca JG |
2303 | trigger_element->trigger); |
2304 | ||
2305 | assert(current_condition); | |
2306 | if (!lttng_condition_is_equal(condition, | |
2307 | current_condition)) { | |
2308 | continue; | |
2309 | } | |
2310 | ||
2311 | DBG("[notification-thread] Removed trigger from channel_triggers_ht"); | |
2312 | cds_list_del(&trigger_element->node); | |
e4db5ace JR |
2313 | /* A trigger can only appear once per channel */ |
2314 | break; | |
ab0ee2ca JG |
2315 | } |
2316 | } | |
2317 | ||
2318 | /* | |
2319 | * Remove and release the client list from | |
2320 | * notification_trigger_clients_ht. | |
2321 | */ | |
ed327204 JG |
2322 | client_list = get_client_list_from_condition(state, condition); |
2323 | assert(client_list); | |
2324 | ||
505b2d90 JG |
2325 | /* Put new reference and the hashtable's reference. */ |
2326 | notification_client_list_put(client_list); | |
2327 | notification_client_list_put(client_list); | |
2328 | client_list = NULL; | |
ab0ee2ca JG |
2329 | |
2330 | /* Remove trigger from triggers_ht. */ | |
2331 | trigger_ht_element = caa_container_of(triggers_ht_node, | |
2332 | struct lttng_trigger_ht_element, node); | |
2333 | cds_lfht_del(state->triggers_ht, triggers_ht_node); | |
2334 | ||
7ca172c1 | 2335 | /* Release the ownership of the trigger. */ |
ab0ee2ca | 2336 | lttng_trigger_destroy(trigger_ht_element->trigger); |
83b934ad | 2337 | call_rcu(&trigger_ht_element->rcu_node, free_lttng_trigger_ht_element_rcu); |
ab0ee2ca JG |
2338 | end: |
2339 | rcu_read_unlock(); | |
2340 | if (_cmd_reply) { | |
2341 | *_cmd_reply = cmd_reply; | |
2342 | } | |
2343 | return 0; | |
2344 | } | |
2345 | ||
2346 | /* Returns 0 on success, 1 on exit requested, negative value on error. */ | |
2347 | int handle_notification_thread_command( | |
2348 | struct notification_thread_handle *handle, | |
2349 | struct notification_thread_state *state) | |
2350 | { | |
2351 | int ret; | |
2352 | uint64_t counter; | |
2353 | struct notification_thread_command *cmd; | |
2354 | ||
8abe313a | 2355 | /* Read the event pipe to put it back into a quiescent state. */ |
18aeca05 | 2356 | ret = lttng_read(lttng_pipe_get_readfd(handle->cmd_queue.event_pipe), &counter, |
8abe313a | 2357 | sizeof(counter)); |
18aeca05 | 2358 | if (ret != sizeof(counter)) { |
ab0ee2ca JG |
2359 | goto error; |
2360 | } | |
2361 | ||
2362 | pthread_mutex_lock(&handle->cmd_queue.lock); | |
2363 | cmd = cds_list_first_entry(&handle->cmd_queue.list, | |
2364 | struct notification_thread_command, cmd_list_node); | |
97a71ea6 JR |
2365 | cds_list_del(&cmd->cmd_list_node); |
2366 | pthread_mutex_unlock(&handle->cmd_queue.lock); | |
ab0ee2ca JG |
2367 | switch (cmd->type) { |
2368 | case NOTIFICATION_COMMAND_TYPE_REGISTER_TRIGGER: | |
2369 | DBG("[notification-thread] Received register trigger command"); | |
2370 | ret = handle_notification_thread_command_register_trigger( | |
2371 | state, cmd->parameters.trigger, | |
2372 | &cmd->reply_code); | |
2373 | break; | |
2374 | case NOTIFICATION_COMMAND_TYPE_UNREGISTER_TRIGGER: | |
2375 | DBG("[notification-thread] Received unregister trigger command"); | |
2376 | ret = handle_notification_thread_command_unregister_trigger( | |
2377 | state, cmd->parameters.trigger, | |
2378 | &cmd->reply_code); | |
2379 | break; | |
2380 | case NOTIFICATION_COMMAND_TYPE_ADD_CHANNEL: | |
2381 | DBG("[notification-thread] Received add channel command"); | |
2382 | ret = handle_notification_thread_command_add_channel( | |
8abe313a JG |
2383 | state, |
2384 | cmd->parameters.add_channel.session.name, | |
2385 | cmd->parameters.add_channel.session.uid, | |
2386 | cmd->parameters.add_channel.session.gid, | |
2387 | cmd->parameters.add_channel.channel.name, | |
2388 | cmd->parameters.add_channel.channel.domain, | |
2389 | cmd->parameters.add_channel.channel.key, | |
2390 | cmd->parameters.add_channel.channel.capacity, | |
ab0ee2ca JG |
2391 | &cmd->reply_code); |
2392 | break; | |
2393 | case NOTIFICATION_COMMAND_TYPE_REMOVE_CHANNEL: | |
2394 | DBG("[notification-thread] Received remove channel command"); | |
2395 | ret = handle_notification_thread_command_remove_channel( | |
2396 | state, cmd->parameters.remove_channel.key, | |
2397 | cmd->parameters.remove_channel.domain, | |
2398 | &cmd->reply_code); | |
2399 | break; | |
0ca52944 | 2400 | case NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_ONGOING: |
0ca52944 | 2401 | case NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_COMPLETED: |
ed327204 JG |
2402 | DBG("[notification-thread] Received session rotation %s command", |
2403 | cmd->type == NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_ONGOING ? | |
2404 | "ongoing" : "completed"); | |
2405 | ret = handle_notification_thread_command_session_rotation( | |
0ca52944 | 2406 | state, |
ed327204 JG |
2407 | cmd->type, |
2408 | cmd->parameters.session_rotation.session_name, | |
2409 | cmd->parameters.session_rotation.uid, | |
2410 | cmd->parameters.session_rotation.gid, | |
2411 | cmd->parameters.session_rotation.trace_archive_chunk_id, | |
2412 | cmd->parameters.session_rotation.location, | |
0ca52944 JG |
2413 | &cmd->reply_code); |
2414 | break; | |
ab0ee2ca JG |
2415 | case NOTIFICATION_COMMAND_TYPE_QUIT: |
2416 | DBG("[notification-thread] Received quit command"); | |
2417 | cmd->reply_code = LTTNG_OK; | |
2418 | ret = 1; | |
2419 | goto end; | |
d1ba29d2 JG |
2420 | case NOTIFICATION_COMMAND_TYPE_CLIENT_COMMUNICATION_UPDATE: |
2421 | { | |
2422 | const enum client_transmission_status client_status = | |
2423 | cmd->parameters.client_communication_update | |
2424 | .status; | |
2425 | const notification_client_id client_id = | |
2426 | cmd->parameters.client_communication_update.id; | |
2427 | struct notification_client *client; | |
2428 | ||
2429 | rcu_read_lock(); | |
2430 | client = get_client_from_id(client_id, state); | |
2431 | ||
2432 | if (!client) { | |
2433 | /* | |
2434 | * Client error was probably already picked-up by the | |
2435 | * notification thread or it has disconnected | |
2436 | * gracefully while this command was queued. | |
2437 | */ | |
2438 | DBG("Failed to find notification client to update communication status, client id = %" PRIu64, | |
2439 | client_id); | |
2440 | ret = 0; | |
2441 | } else { | |
2442 | pthread_mutex_lock(&client->lock); | |
2443 | ret = client_handle_transmission_status( | |
2444 | client, client_status, state); | |
2445 | pthread_mutex_unlock(&client->lock); | |
2446 | } | |
2447 | rcu_read_unlock(); | |
2448 | break; | |
2449 | } | |
ab0ee2ca JG |
2450 | default: |
2451 | ERR("[notification-thread] Unknown internal command received"); | |
2452 | goto error_unlock; | |
2453 | } | |
2454 | ||
2455 | if (ret) { | |
2456 | goto error_unlock; | |
2457 | } | |
2458 | end: | |
0ab399e0 JG |
2459 | if (cmd->is_async) { |
2460 | free(cmd); | |
2461 | cmd = NULL; | |
2462 | } else { | |
2463 | lttng_waiter_wake_up(&cmd->reply_waiter); | |
2464 | } | |
ab0ee2ca JG |
2465 | return ret; |
2466 | error_unlock: | |
2467 | /* Wake-up and return a fatal error to the calling thread. */ | |
8ada111f | 2468 | lttng_waiter_wake_up(&cmd->reply_waiter); |
ab0ee2ca JG |
2469 | cmd->reply_code = LTTNG_ERR_FATAL; |
2470 | error: | |
2471 | /* Indicate a fatal error to the caller. */ | |
2472 | return -1; | |
2473 | } | |
2474 | ||
ab0ee2ca JG |
2475 | static |
2476 | int socket_set_non_blocking(int socket) | |
2477 | { | |
2478 | int ret, flags; | |
2479 | ||
2480 | /* Set the pipe as non-blocking. */ | |
2481 | ret = fcntl(socket, F_GETFL, 0); | |
2482 | if (ret == -1) { | |
2483 | PERROR("fcntl get socket flags"); | |
2484 | goto end; | |
2485 | } | |
2486 | flags = ret; | |
2487 | ||
2488 | ret = fcntl(socket, F_SETFL, flags | O_NONBLOCK); | |
2489 | if (ret == -1) { | |
2490 | PERROR("fcntl set O_NONBLOCK socket flag"); | |
2491 | goto end; | |
2492 | } | |
2493 | DBG("Client socket (fd = %i) set as non-blocking", socket); | |
2494 | end: | |
2495 | return ret; | |
2496 | } | |
2497 | ||
505b2d90 | 2498 | /* Client lock must be acquired by caller. */ |
ab0ee2ca | 2499 | static |
14fa22f8 | 2500 | int client_reset_inbound_state(struct notification_client *client) |
ab0ee2ca JG |
2501 | { |
2502 | int ret; | |
2503 | ||
505b2d90 JG |
2504 | ASSERT_LOCKED(client->lock); |
2505 | ||
ab0ee2ca JG |
2506 | ret = lttng_dynamic_buffer_set_size( |
2507 | &client->communication.inbound.buffer, 0); | |
2508 | assert(!ret); | |
2509 | ||
2510 | client->communication.inbound.bytes_to_receive = | |
2511 | sizeof(struct lttng_notification_channel_message); | |
2512 | client->communication.inbound.msg_type = | |
2513 | LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_UNKNOWN; | |
ab0ee2ca JG |
2514 | LTTNG_SOCK_SET_UID_CRED(&client->communication.inbound.creds, -1); |
2515 | LTTNG_SOCK_SET_GID_CRED(&client->communication.inbound.creds, -1); | |
14fa22f8 JG |
2516 | ret = lttng_dynamic_buffer_set_size( |
2517 | &client->communication.inbound.buffer, | |
2518 | client->communication.inbound.bytes_to_receive); | |
2519 | return ret; | |
ab0ee2ca JG |
2520 | } |
2521 | ||
2522 | int handle_notification_thread_client_connect( | |
2523 | struct notification_thread_state *state) | |
2524 | { | |
2525 | int ret; | |
2526 | struct notification_client *client; | |
2527 | ||
2528 | DBG("[notification-thread] Handling new notification channel client connection"); | |
2529 | ||
2530 | client = zmalloc(sizeof(*client)); | |
2531 | if (!client) { | |
2532 | /* Fatal error. */ | |
2533 | ret = -1; | |
2534 | goto error; | |
2535 | } | |
505b2d90 | 2536 | pthread_mutex_init(&client->lock, NULL); |
ac1889bf | 2537 | client->id = state->next_notification_client_id++; |
ab0ee2ca JG |
2538 | CDS_INIT_LIST_HEAD(&client->condition_list); |
2539 | lttng_dynamic_buffer_init(&client->communication.inbound.buffer); | |
2540 | lttng_dynamic_buffer_init(&client->communication.outbound.buffer); | |
01ea340e | 2541 | client->communication.inbound.expect_creds = true; |
505b2d90 JG |
2542 | |
2543 | pthread_mutex_lock(&client->lock); | |
14fa22f8 | 2544 | ret = client_reset_inbound_state(client); |
505b2d90 | 2545 | pthread_mutex_unlock(&client->lock); |
14fa22f8 JG |
2546 | if (ret) { |
2547 | ERR("[notification-thread] Failed to reset client communication's inbound state"); | |
e742b055 | 2548 | ret = 0; |
14fa22f8 JG |
2549 | goto error; |
2550 | } | |
ab0ee2ca JG |
2551 | |
2552 | ret = lttcomm_accept_unix_sock(state->notification_channel_socket); | |
2553 | if (ret < 0) { | |
2554 | ERR("[notification-thread] Failed to accept new notification channel client connection"); | |
2555 | ret = 0; | |
2556 | goto error; | |
2557 | } | |
2558 | ||
2559 | client->socket = ret; | |
2560 | ||
2561 | ret = socket_set_non_blocking(client->socket); | |
2562 | if (ret) { | |
2563 | ERR("[notification-thread] Failed to set new notification channel client connection socket as non-blocking"); | |
2564 | goto error; | |
2565 | } | |
2566 | ||
2567 | ret = lttcomm_setsockopt_creds_unix_sock(client->socket); | |
2568 | if (ret < 0) { | |
2569 | ERR("[notification-thread] Failed to set socket options on new notification channel client socket"); | |
2570 | ret = 0; | |
2571 | goto error; | |
2572 | } | |
2573 | ||
2574 | ret = lttng_poll_add(&state->events, client->socket, | |
2575 | LPOLLIN | LPOLLERR | | |
2576 | LPOLLHUP | LPOLLRDHUP); | |
2577 | if (ret < 0) { | |
2578 | ERR("[notification-thread] Failed to add notification channel client socket to poll set"); | |
2579 | ret = 0; | |
2580 | goto error; | |
2581 | } | |
2582 | DBG("[notification-thread] Added new notification channel client socket (%i) to poll set", | |
2583 | client->socket); | |
2584 | ||
ab0ee2ca JG |
2585 | rcu_read_lock(); |
2586 | cds_lfht_add(state->client_socket_ht, | |
2587 | hash_client_socket(client->socket), | |
2588 | &client->client_socket_ht_node); | |
ac1889bf JG |
2589 | cds_lfht_add(state->client_id_ht, |
2590 | hash_client_id(client->id), | |
2591 | &client->client_id_ht_node); | |
ab0ee2ca JG |
2592 | rcu_read_unlock(); |
2593 | ||
2594 | return ret; | |
2595 | error: | |
2596 | notification_client_destroy(client, state); | |
2597 | return ret; | |
2598 | } | |
2599 | ||
505b2d90 JG |
2600 | /* RCU read-lock must be held by the caller. */ |
2601 | /* Client lock must be held by the caller */ | |
2602 | static | |
2603 | int notification_thread_client_disconnect( | |
2604 | struct notification_client *client, | |
ab0ee2ca | 2605 | struct notification_thread_state *state) |
505b2d90 JG |
2606 | { |
2607 | int ret; | |
2608 | struct lttng_condition_list_element *condition_list_element, *tmp; | |
2609 | ||
2610 | /* Acquire the client lock to disable its communication atomically. */ | |
2611 | client->communication.active = false; | |
2612 | ret = lttng_poll_del(&state->events, client->socket); | |
2613 | if (ret) { | |
2614 | ERR("[notification-thread] Failed to remove client socket %d from poll set", | |
2615 | client->socket); | |
2616 | } | |
2617 | ||
2618 | cds_lfht_del(state->client_socket_ht, &client->client_socket_ht_node); | |
2619 | cds_lfht_del(state->client_id_ht, &client->client_id_ht_node); | |
2620 | ||
2621 | /* Release all conditions to which the client was subscribed. */ | |
2622 | cds_list_for_each_entry_safe(condition_list_element, tmp, | |
2623 | &client->condition_list, node) { | |
2624 | (void) notification_thread_client_unsubscribe(client, | |
2625 | condition_list_element->condition, state, NULL); | |
2626 | } | |
2627 | ||
2628 | /* | |
2629 | * Client no longer accessible to other threads (through the | |
2630 | * client lists). | |
2631 | */ | |
2632 | notification_client_destroy(client, state); | |
2633 | return ret; | |
2634 | } | |
2635 | ||
2636 | int handle_notification_thread_client_disconnect( | |
2637 | int client_socket, struct notification_thread_state *state) | |
ab0ee2ca JG |
2638 | { |
2639 | int ret = 0; | |
2640 | struct notification_client *client; | |
2641 | ||
2642 | rcu_read_lock(); | |
2643 | DBG("[notification-thread] Closing client connection (socket fd = %i)", | |
2644 | client_socket); | |
2645 | client = get_client_from_socket(client_socket, state); | |
2646 | if (!client) { | |
2647 | /* Internal state corruption, fatal error. */ | |
2648 | ERR("[notification-thread] Unable to find client (socket fd = %i)", | |
2649 | client_socket); | |
2650 | ret = -1; | |
2651 | goto end; | |
2652 | } | |
2653 | ||
505b2d90 JG |
2654 | pthread_mutex_lock(&client->lock); |
2655 | ret = notification_thread_client_disconnect(client, state); | |
2656 | pthread_mutex_unlock(&client->lock); | |
ab0ee2ca JG |
2657 | end: |
2658 | rcu_read_unlock(); | |
2659 | return ret; | |
2660 | } | |
2661 | ||
2662 | int handle_notification_thread_client_disconnect_all( | |
2663 | struct notification_thread_state *state) | |
2664 | { | |
2665 | struct cds_lfht_iter iter; | |
2666 | struct notification_client *client; | |
2667 | bool error_encoutered = false; | |
2668 | ||
2669 | rcu_read_lock(); | |
2670 | DBG("[notification-thread] Closing all client connections"); | |
2671 | cds_lfht_for_each_entry(state->client_socket_ht, &iter, client, | |
505b2d90 | 2672 | client_socket_ht_node) { |
ab0ee2ca JG |
2673 | int ret; |
2674 | ||
505b2d90 JG |
2675 | pthread_mutex_lock(&client->lock); |
2676 | ret = notification_thread_client_disconnect( | |
2677 | client, state); | |
2678 | pthread_mutex_unlock(&client->lock); | |
ab0ee2ca JG |
2679 | if (ret) { |
2680 | error_encoutered = true; | |
2681 | } | |
2682 | } | |
2683 | rcu_read_unlock(); | |
2684 | return error_encoutered ? 1 : 0; | |
2685 | } | |
2686 | ||
2687 | int handle_notification_thread_trigger_unregister_all( | |
2688 | struct notification_thread_state *state) | |
2689 | { | |
4149ace8 | 2690 | bool error_occurred = false; |
ab0ee2ca JG |
2691 | struct cds_lfht_iter iter; |
2692 | struct lttng_trigger_ht_element *trigger_ht_element; | |
2693 | ||
763de384 | 2694 | rcu_read_lock(); |
ab0ee2ca JG |
2695 | cds_lfht_for_each_entry(state->triggers_ht, &iter, trigger_ht_element, |
2696 | node) { | |
2697 | int ret = handle_notification_thread_command_unregister_trigger( | |
2698 | state, trigger_ht_element->trigger, NULL); | |
2699 | if (ret) { | |
4149ace8 | 2700 | error_occurred = true; |
ab0ee2ca JG |
2701 | } |
2702 | } | |
763de384 | 2703 | rcu_read_unlock(); |
4149ace8 | 2704 | return error_occurred ? -1 : 0; |
ab0ee2ca JG |
2705 | } |
2706 | ||
dd877ea6 JG |
2707 | static |
2708 | int client_handle_transmission_status( | |
2709 | struct notification_client *client, | |
2710 | enum client_transmission_status transmission_status, | |
2711 | struct notification_thread_state *state) | |
2712 | { | |
2713 | int ret = 0; | |
2714 | ||
2715 | switch (transmission_status) { | |
2716 | case CLIENT_TRANSMISSION_STATUS_COMPLETE: | |
2717 | ret = lttng_poll_mod(&state->events, client->socket, | |
2718 | CLIENT_POLL_MASK_IN); | |
2719 | if (ret) { | |
2720 | goto end; | |
2721 | } | |
2722 | ||
2723 | client->communication.outbound.queued_command_reply = false; | |
2724 | client->communication.outbound.dropped_notification = false; | |
2725 | break; | |
2726 | case CLIENT_TRANSMISSION_STATUS_QUEUED: | |
2727 | /* | |
2728 | * We want to be notified whenever there is buffer space | |
2729 | * available to send the rest of the payload. | |
2730 | */ | |
2731 | ret = lttng_poll_mod(&state->events, client->socket, | |
2732 | CLIENT_POLL_MASK_IN_OUT); | |
2733 | if (ret) { | |
2734 | goto end; | |
2735 | } | |
2736 | break; | |
2737 | case CLIENT_TRANSMISSION_STATUS_FAIL: | |
2738 | ret = notification_thread_client_disconnect(client, state); | |
2739 | if (ret) { | |
2740 | goto end; | |
2741 | } | |
2742 | break; | |
2743 | case CLIENT_TRANSMISSION_STATUS_ERROR: | |
2744 | ret = -1; | |
2745 | goto end; | |
2746 | default: | |
2747 | abort(); | |
2748 | } | |
2749 | end: | |
2750 | return ret; | |
2751 | } | |
2752 | ||
505b2d90 | 2753 | /* Client lock must be acquired by caller. */ |
ab0ee2ca | 2754 | static |
dd877ea6 | 2755 | enum client_transmission_status client_flush_outgoing_queue( |
d1ba29d2 | 2756 | struct notification_client *client) |
ab0ee2ca JG |
2757 | { |
2758 | ssize_t ret; | |
2759 | size_t to_send_count; | |
dd877ea6 | 2760 | enum client_transmission_status status; |
ab0ee2ca | 2761 | |
505b2d90 JG |
2762 | ASSERT_LOCKED(client->lock); |
2763 | ||
d1ba29d2 JG |
2764 | if (!client->communication.active) { |
2765 | status = CLIENT_TRANSMISSION_STATUS_FAIL; | |
2766 | goto end; | |
2767 | } | |
2768 | ||
ab0ee2ca JG |
2769 | assert(client->communication.outbound.buffer.size != 0); |
2770 | to_send_count = client->communication.outbound.buffer.size; | |
2771 | DBG("[notification-thread] Flushing client (socket fd = %i) outgoing queue", | |
2772 | client->socket); | |
2773 | ||
2774 | ret = lttcomm_send_unix_sock_non_block(client->socket, | |
2775 | client->communication.outbound.buffer.data, | |
2776 | to_send_count); | |
44c180ca | 2777 | if ((ret >= 0 && ret < to_send_count)) { |
ab0ee2ca JG |
2778 | DBG("[notification-thread] Client (socket fd = %i) outgoing queue could not be completely flushed", |
2779 | client->socket); | |
2780 | to_send_count -= max(ret, 0); | |
2781 | ||
2782 | memcpy(client->communication.outbound.buffer.data, | |
2783 | client->communication.outbound.buffer.data + | |
2784 | client->communication.outbound.buffer.size - to_send_count, | |
2785 | to_send_count); | |
2786 | ret = lttng_dynamic_buffer_set_size( | |
2787 | &client->communication.outbound.buffer, | |
2788 | to_send_count); | |
2789 | if (ret) { | |
2790 | goto error; | |
2791 | } | |
dd877ea6 | 2792 | status = CLIENT_TRANSMISSION_STATUS_QUEUED; |
ab0ee2ca JG |
2793 | } else if (ret < 0) { |
2794 | /* Generic error, disconnect the client. */ | |
dd877ea6 | 2795 | ERR("[notification-thread] Failed to flush outgoing queue, disconnecting client (socket fd = %i)", |
ab0ee2ca | 2796 | client->socket); |
dd877ea6 | 2797 | status = CLIENT_TRANSMISSION_STATUS_FAIL; |
ab0ee2ca JG |
2798 | } else { |
2799 | /* No error and flushed the queue completely. */ | |
2800 | ret = lttng_dynamic_buffer_set_size( | |
2801 | &client->communication.outbound.buffer, 0); | |
2802 | if (ret) { | |
2803 | goto error; | |
2804 | } | |
dd877ea6 JG |
2805 | status = CLIENT_TRANSMISSION_STATUS_COMPLETE; |
2806 | } | |
d1ba29d2 JG |
2807 | end: |
2808 | return status; | |
ab0ee2ca | 2809 | error: |
d1ba29d2 | 2810 | return CLIENT_TRANSMISSION_STATUS_ERROR; |
ab0ee2ca JG |
2811 | } |
2812 | ||
505b2d90 | 2813 | /* Client lock must be acquired by caller. */ |
ab0ee2ca JG |
2814 | static |
2815 | int client_send_command_reply(struct notification_client *client, | |
2816 | struct notification_thread_state *state, | |
2817 | enum lttng_notification_channel_status status) | |
2818 | { | |
2819 | int ret; | |
2820 | struct lttng_notification_channel_command_reply reply = { | |
2821 | .status = (int8_t) status, | |
2822 | }; | |
2823 | struct lttng_notification_channel_message msg = { | |
2824 | .type = (int8_t) LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_COMMAND_REPLY, | |
2825 | .size = sizeof(reply), | |
2826 | }; | |
2827 | char buffer[sizeof(msg) + sizeof(reply)]; | |
d1ba29d2 | 2828 | enum client_transmission_status transmission_status; |
ab0ee2ca | 2829 | |
505b2d90 JG |
2830 | ASSERT_LOCKED(client->lock); |
2831 | ||
ab0ee2ca JG |
2832 | if (client->communication.outbound.queued_command_reply) { |
2833 | /* Protocol error. */ | |
2834 | goto error; | |
2835 | } | |
2836 | ||
2837 | memcpy(buffer, &msg, sizeof(msg)); | |
2838 | memcpy(buffer + sizeof(msg), &reply, sizeof(reply)); | |
2839 | DBG("[notification-thread] Send command reply (%i)", (int) status); | |
2840 | ||
2841 | /* Enqueue buffer to outgoing queue and flush it. */ | |
2842 | ret = lttng_dynamic_buffer_append( | |
2843 | &client->communication.outbound.buffer, | |
2844 | buffer, sizeof(buffer)); | |
2845 | if (ret) { | |
2846 | goto error; | |
2847 | } | |
2848 | ||
d1ba29d2 JG |
2849 | transmission_status = client_flush_outgoing_queue(client); |
2850 | ret = client_handle_transmission_status( | |
2851 | client, transmission_status, state); | |
ab0ee2ca JG |
2852 | if (ret) { |
2853 | goto error; | |
2854 | } | |
2855 | ||
2856 | if (client->communication.outbound.buffer.size != 0) { | |
2857 | /* Queue could not be emptied. */ | |
2858 | client->communication.outbound.queued_command_reply = true; | |
2859 | } | |
2860 | ||
2861 | return 0; | |
2862 | error: | |
2863 | return -1; | |
2864 | } | |
2865 | ||
505b2d90 JG |
2866 | static |
2867 | int client_handle_message_unknown(struct notification_client *client, | |
2868 | struct notification_thread_state *state) | |
2869 | { | |
2870 | int ret; | |
2871 | ||
2872 | pthread_mutex_lock(&client->lock); | |
2873 | ||
2874 | /* | |
2875 | * Receiving message header. The function will be called again | |
2876 | * once the rest of the message as been received and can be | |
2877 | * interpreted. | |
2878 | */ | |
2879 | const struct lttng_notification_channel_message *msg; | |
2880 | ||
2881 | assert(sizeof(*msg) == client->communication.inbound.buffer.size); | |
2882 | msg = (const struct lttng_notification_channel_message *) | |
2883 | client->communication.inbound.buffer.data; | |
2884 | ||
2885 | if (msg->size == 0 || | |
2886 | msg->size > DEFAULT_MAX_NOTIFICATION_CLIENT_MESSAGE_PAYLOAD_SIZE) { | |
2887 | ERR("[notification-thread] Invalid notification channel message: length = %u", | |
2888 | msg->size); | |
2889 | ret = -1; | |
2890 | goto end; | |
2891 | } | |
2892 | ||
2893 | switch (msg->type) { | |
2894 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_SUBSCRIBE: | |
2895 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_UNSUBSCRIBE: | |
2896 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_HANDSHAKE: | |
2897 | break; | |
2898 | default: | |
2899 | ret = -1; | |
2900 | ERR("[notification-thread] Invalid notification channel message: unexpected message type"); | |
2901 | goto end; | |
2902 | } | |
2903 | ||
2904 | client->communication.inbound.bytes_to_receive = msg->size; | |
2905 | client->communication.inbound.msg_type = | |
2906 | (enum lttng_notification_channel_message_type) msg->type; | |
2907 | ret = lttng_dynamic_buffer_set_size( | |
2908 | &client->communication.inbound.buffer, msg->size); | |
2909 | end: | |
2910 | pthread_mutex_unlock(&client->lock); | |
2911 | return ret; | |
2912 | } | |
2913 | ||
2914 | static | |
2915 | int client_handle_message_handshake(struct notification_client *client, | |
2916 | struct notification_thread_state *state) | |
2917 | { | |
2918 | int ret; | |
2919 | struct lttng_notification_channel_command_handshake *handshake_client; | |
2920 | const struct lttng_notification_channel_command_handshake handshake_reply = { | |
2921 | .major = LTTNG_NOTIFICATION_CHANNEL_VERSION_MAJOR, | |
2922 | .minor = LTTNG_NOTIFICATION_CHANNEL_VERSION_MINOR, | |
2923 | }; | |
2924 | const struct lttng_notification_channel_message msg_header = { | |
2925 | .type = LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_HANDSHAKE, | |
2926 | .size = sizeof(handshake_reply), | |
2927 | }; | |
2928 | enum lttng_notification_channel_status status = | |
2929 | LTTNG_NOTIFICATION_CHANNEL_STATUS_OK; | |
2930 | char send_buffer[sizeof(msg_header) + sizeof(handshake_reply)]; | |
d1ba29d2 | 2931 | enum client_transmission_status transmission_status; |
505b2d90 JG |
2932 | |
2933 | pthread_mutex_lock(&client->lock); | |
2934 | ||
2935 | memcpy(send_buffer, &msg_header, sizeof(msg_header)); | |
2936 | memcpy(send_buffer + sizeof(msg_header), &handshake_reply, | |
2937 | sizeof(handshake_reply)); | |
2938 | ||
2939 | handshake_client = | |
2940 | (struct lttng_notification_channel_command_handshake *) | |
2941 | client->communication.inbound.buffer | |
2942 | .data; | |
2943 | client->major = handshake_client->major; | |
2944 | client->minor = handshake_client->minor; | |
2945 | if (!client->communication.inbound.creds_received) { | |
2946 | ERR("[notification-thread] No credentials received from client"); | |
2947 | ret = -1; | |
2948 | goto end; | |
2949 | } | |
2950 | ||
2951 | client->uid = LTTNG_SOCK_GET_UID_CRED( | |
2952 | &client->communication.inbound.creds); | |
2953 | client->gid = LTTNG_SOCK_GET_GID_CRED( | |
2954 | &client->communication.inbound.creds); | |
2955 | DBG("[notification-thread] Received handshake from client (uid = %u, gid = %u) with version %i.%i", | |
2956 | client->uid, client->gid, (int) client->major, | |
2957 | (int) client->minor); | |
2958 | ||
2959 | if (handshake_client->major != | |
2960 | LTTNG_NOTIFICATION_CHANNEL_VERSION_MAJOR) { | |
2961 | status = LTTNG_NOTIFICATION_CHANNEL_STATUS_UNSUPPORTED_VERSION; | |
2962 | } | |
2963 | ||
2964 | ret = lttng_dynamic_buffer_append( | |
2965 | &client->communication.outbound.buffer, send_buffer, | |
2966 | sizeof(send_buffer)); | |
2967 | if (ret) { | |
2968 | ERR("[notification-thread] Failed to send protocol version to notification channel client"); | |
2969 | goto end; | |
2970 | } | |
2971 | ||
2972 | client->validated = true; | |
2973 | client->communication.active = true; | |
2974 | ||
d1ba29d2 JG |
2975 | transmission_status = client_flush_outgoing_queue(client); |
2976 | ret = client_handle_transmission_status( | |
2977 | client, transmission_status, state); | |
505b2d90 JG |
2978 | if (ret) { |
2979 | goto end; | |
2980 | } | |
2981 | ||
2982 | ret = client_send_command_reply(client, state, status); | |
2983 | if (ret) { | |
2984 | ERR("[notification-thread] Failed to send reply to notification channel client"); | |
2985 | goto end; | |
2986 | } | |
2987 | ||
2988 | /* Set reception state to receive the next message header. */ | |
2989 | ret = client_reset_inbound_state(client); | |
2990 | if (ret) { | |
2991 | ERR("[notification-thread] Failed to reset client communication's inbound state"); | |
2992 | goto end; | |
2993 | } | |
2994 | ||
2995 | end: | |
2996 | pthread_mutex_unlock(&client->lock); | |
2997 | return ret; | |
2998 | } | |
2999 | ||
3000 | static | |
3001 | int client_handle_message_subscription( | |
3002 | struct notification_client *client, | |
3003 | enum lttng_notification_channel_message_type msg_type, | |
3004 | struct notification_thread_state *state) | |
3005 | { | |
3006 | int ret; | |
3007 | struct lttng_condition *condition; | |
3008 | enum lttng_notification_channel_status status = | |
3009 | LTTNG_NOTIFICATION_CHANNEL_STATUS_OK; | |
3010 | struct lttng_payload_view condition_view = | |
3011 | lttng_payload_view_from_dynamic_buffer( | |
3012 | &client->communication.inbound.buffer, | |
3013 | 0, -1); | |
3014 | size_t expected_condition_size; | |
3015 | ||
3016 | pthread_mutex_lock(&client->lock); | |
3017 | expected_condition_size = client->communication.inbound.buffer.size; | |
3018 | pthread_mutex_unlock(&client->lock); | |
3019 | ||
3020 | ret = lttng_condition_create_from_payload(&condition_view, &condition); | |
3021 | if (ret != expected_condition_size) { | |
3022 | ERR("[notification-thread] Malformed condition received from client"); | |
3023 | goto end; | |
3024 | } | |
3025 | ||
3026 | if (msg_type == LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_SUBSCRIBE) { | |
3027 | ret = notification_thread_client_subscribe( | |
3028 | client, condition, state, &status); | |
3029 | } else { | |
3030 | ret = notification_thread_client_unsubscribe( | |
3031 | client, condition, state, &status); | |
3032 | } | |
3033 | if (ret) { | |
3034 | goto end; | |
3035 | } | |
3036 | ||
3037 | pthread_mutex_lock(&client->lock); | |
3038 | ret = client_send_command_reply(client, state, status); | |
3039 | if (ret) { | |
3040 | ERR("[notification-thread] Failed to send reply to notification channel client"); | |
3041 | goto end_unlock; | |
3042 | } | |
3043 | ||
3044 | /* Set reception state to receive the next message header. */ | |
3045 | ret = client_reset_inbound_state(client); | |
3046 | if (ret) { | |
3047 | ERR("[notification-thread] Failed to reset client communication's inbound state"); | |
3048 | goto end_unlock; | |
3049 | } | |
3050 | ||
3051 | end_unlock: | |
3052 | pthread_mutex_unlock(&client->lock); | |
3053 | end: | |
3054 | return ret; | |
3055 | } | |
3056 | ||
ab0ee2ca JG |
3057 | static |
3058 | int client_dispatch_message(struct notification_client *client, | |
3059 | struct notification_thread_state *state) | |
3060 | { | |
3061 | int ret = 0; | |
3062 | ||
3063 | if (client->communication.inbound.msg_type != | |
3064 | LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_HANDSHAKE && | |
3065 | client->communication.inbound.msg_type != | |
3066 | LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_UNKNOWN && | |
3067 | !client->validated) { | |
3068 | WARN("[notification-thread] client attempted a command before handshake"); | |
3069 | ret = -1; | |
3070 | goto end; | |
3071 | } | |
3072 | ||
3073 | switch (client->communication.inbound.msg_type) { | |
3074 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_UNKNOWN: | |
3075 | { | |
505b2d90 | 3076 | ret = client_handle_message_unknown(client, state); |
ab0ee2ca JG |
3077 | break; |
3078 | } | |
3079 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_HANDSHAKE: | |
3080 | { | |
505b2d90 | 3081 | ret = client_handle_message_handshake(client, state); |
ab0ee2ca JG |
3082 | break; |
3083 | } | |
3084 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_SUBSCRIBE: | |
3085 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_UNSUBSCRIBE: | |
3086 | { | |
505b2d90 JG |
3087 | ret = client_handle_message_subscription(client, |
3088 | client->communication.inbound.msg_type, state); | |
ab0ee2ca JG |
3089 | break; |
3090 | } | |
3091 | default: | |
3092 | abort(); | |
3093 | } | |
3094 | end: | |
3095 | return ret; | |
3096 | } | |
3097 | ||
3098 | /* Incoming data from client. */ | |
3099 | int handle_notification_thread_client_in( | |
3100 | struct notification_thread_state *state, int socket) | |
3101 | { | |
14fa22f8 | 3102 | int ret = 0; |
ab0ee2ca JG |
3103 | struct notification_client *client; |
3104 | ssize_t recv_ret; | |
3105 | size_t offset; | |
505b2d90 | 3106 | bool message_is_complete = false; |
ab0ee2ca JG |
3107 | |
3108 | client = get_client_from_socket(socket, state); | |
3109 | if (!client) { | |
3110 | /* Internal error, abort. */ | |
3111 | ret = -1; | |
3112 | goto end; | |
3113 | } | |
3114 | ||
505b2d90 | 3115 | pthread_mutex_lock(&client->lock); |
14fa22f8 JG |
3116 | offset = client->communication.inbound.buffer.size - |
3117 | client->communication.inbound.bytes_to_receive; | |
01ea340e | 3118 | if (client->communication.inbound.expect_creds) { |
ab0ee2ca JG |
3119 | recv_ret = lttcomm_recv_creds_unix_sock(socket, |
3120 | client->communication.inbound.buffer.data + offset, | |
3121 | client->communication.inbound.bytes_to_receive, | |
3122 | &client->communication.inbound.creds); | |
3123 | if (recv_ret > 0) { | |
01ea340e | 3124 | client->communication.inbound.expect_creds = false; |
ab0ee2ca JG |
3125 | client->communication.inbound.creds_received = true; |
3126 | } | |
3127 | } else { | |
3128 | recv_ret = lttcomm_recv_unix_sock_non_block(socket, | |
3129 | client->communication.inbound.buffer.data + offset, | |
3130 | client->communication.inbound.bytes_to_receive); | |
3131 | } | |
505b2d90 JG |
3132 | if (recv_ret >= 0) { |
3133 | client->communication.inbound.bytes_to_receive -= recv_ret; | |
3134 | message_is_complete = client->communication.inbound | |
3135 | .bytes_to_receive == 0; | |
3136 | } | |
3137 | pthread_mutex_unlock(&client->lock); | |
ab0ee2ca JG |
3138 | if (recv_ret < 0) { |
3139 | goto error_disconnect_client; | |
3140 | } | |
3141 | ||
505b2d90 | 3142 | if (message_is_complete) { |
ab0ee2ca JG |
3143 | ret = client_dispatch_message(client, state); |
3144 | if (ret) { | |
3145 | /* | |
3146 | * Only returns an error if this client must be | |
3147 | * disconnected. | |
3148 | */ | |
3149 | goto error_disconnect_client; | |
3150 | } | |
ab0ee2ca JG |
3151 | } |
3152 | end: | |
3153 | return ret; | |
3154 | error_disconnect_client: | |
505b2d90 JG |
3155 | pthread_mutex_lock(&client->lock); |
3156 | ret = notification_thread_client_disconnect(client, state); | |
3157 | pthread_mutex_unlock(&client->lock); | |
ab0ee2ca JG |
3158 | return ret; |
3159 | } | |
3160 | ||
3161 | /* Client ready to receive outgoing data. */ | |
3162 | int handle_notification_thread_client_out( | |
3163 | struct notification_thread_state *state, int socket) | |
3164 | { | |
3165 | int ret; | |
3166 | struct notification_client *client; | |
d1ba29d2 | 3167 | enum client_transmission_status transmission_status; |
ab0ee2ca JG |
3168 | |
3169 | client = get_client_from_socket(socket, state); | |
3170 | if (!client) { | |
3171 | /* Internal error, abort. */ | |
3172 | ret = -1; | |
3173 | goto end; | |
3174 | } | |
3175 | ||
505b2d90 | 3176 | pthread_mutex_lock(&client->lock); |
d1ba29d2 JG |
3177 | transmission_status = client_flush_outgoing_queue(client); |
3178 | ret = client_handle_transmission_status( | |
3179 | client, transmission_status, state); | |
505b2d90 | 3180 | pthread_mutex_unlock(&client->lock); |
ab0ee2ca JG |
3181 | if (ret) { |
3182 | goto end; | |
3183 | } | |
3184 | end: | |
3185 | return ret; | |
3186 | } | |
3187 | ||
3188 | static | |
e8360425 JD |
3189 | bool evaluate_buffer_usage_condition(const struct lttng_condition *condition, |
3190 | const struct channel_state_sample *sample, | |
3191 | uint64_t buffer_capacity) | |
ab0ee2ca JG |
3192 | { |
3193 | bool result = false; | |
3194 | uint64_t threshold; | |
3195 | enum lttng_condition_type condition_type; | |
e8360425 | 3196 | const struct lttng_condition_buffer_usage *use_condition = container_of( |
ab0ee2ca JG |
3197 | condition, struct lttng_condition_buffer_usage, |
3198 | parent); | |
3199 | ||
ab0ee2ca JG |
3200 | if (use_condition->threshold_bytes.set) { |
3201 | threshold = use_condition->threshold_bytes.value; | |
3202 | } else { | |
3203 | /* | |
3204 | * Threshold was expressed as a ratio. | |
3205 | * | |
3206 | * TODO the threshold (in bytes) of conditions expressed | |
3207 | * as a ratio of total buffer size could be cached to | |
3208 | * forego this double-multiplication or it could be performed | |
3209 | * as fixed-point math. | |
3210 | * | |
d49487dc | 3211 | * Note that caching should accommodates the case where the |
ab0ee2ca JG |
3212 | * condition applies to multiple channels (i.e. don't assume |
3213 | * that all channels matching my_chann* have the same size...) | |
3214 | */ | |
3215 | threshold = (uint64_t) (use_condition->threshold_ratio.value * | |
3216 | (double) buffer_capacity); | |
3217 | } | |
3218 | ||
3219 | condition_type = lttng_condition_get_type(condition); | |
3220 | if (condition_type == LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW) { | |
3221 | DBG("[notification-thread] Low buffer usage condition being evaluated: threshold = %" PRIu64 ", highest usage = %" PRIu64, | |
3222 | threshold, sample->highest_usage); | |
3223 | ||
3224 | /* | |
3225 | * The low condition should only be triggered once _all_ of the | |
3226 | * streams in a channel have gone below the "low" threshold. | |
3227 | */ | |
3228 | if (sample->highest_usage <= threshold) { | |
3229 | result = true; | |
3230 | } | |
3231 | } else { | |
3232 | DBG("[notification-thread] High buffer usage condition being evaluated: threshold = %" PRIu64 ", highest usage = %" PRIu64, | |
3233 | threshold, sample->highest_usage); | |
3234 | ||
3235 | /* | |
3236 | * For high buffer usage scenarios, we want to trigger whenever | |
3237 | * _any_ of the streams has reached the "high" threshold. | |
3238 | */ | |
3239 | if (sample->highest_usage >= threshold) { | |
3240 | result = true; | |
3241 | } | |
3242 | } | |
e8360425 | 3243 | |
ab0ee2ca JG |
3244 | return result; |
3245 | } | |
3246 | ||
3247 | static | |
e8360425 JD |
3248 | bool evaluate_session_consumed_size_condition( |
3249 | const struct lttng_condition *condition, | |
3250 | uint64_t session_consumed_size) | |
3251 | { | |
3252 | uint64_t threshold; | |
3253 | const struct lttng_condition_session_consumed_size *size_condition = | |
3254 | container_of(condition, | |
3255 | struct lttng_condition_session_consumed_size, | |
3256 | parent); | |
3257 | ||
3258 | threshold = size_condition->consumed_threshold_bytes.value; | |
3259 | DBG("[notification-thread] Session consumed size condition being evaluated: threshold = %" PRIu64 ", current size = %" PRIu64, | |
3260 | threshold, session_consumed_size); | |
3261 | return session_consumed_size >= threshold; | |
3262 | } | |
3263 | ||
3264 | static | |
ed327204 | 3265 | int evaluate_buffer_condition(const struct lttng_condition *condition, |
ab0ee2ca | 3266 | struct lttng_evaluation **evaluation, |
e8360425 JD |
3267 | const struct notification_thread_state *state, |
3268 | const struct channel_state_sample *previous_sample, | |
3269 | const struct channel_state_sample *latest_sample, | |
3270 | uint64_t previous_session_consumed_total, | |
3271 | uint64_t latest_session_consumed_total, | |
3272 | struct channel_info *channel_info) | |
ab0ee2ca JG |
3273 | { |
3274 | int ret = 0; | |
3275 | enum lttng_condition_type condition_type; | |
e8360425 JD |
3276 | const bool previous_sample_available = !!previous_sample; |
3277 | bool previous_sample_result = false; | |
ab0ee2ca JG |
3278 | bool latest_sample_result; |
3279 | ||
3280 | condition_type = lttng_condition_get_type(condition); | |
ab0ee2ca | 3281 | |
e8360425 JD |
3282 | switch (condition_type) { |
3283 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
3284 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
3285 | if (caa_likely(previous_sample_available)) { | |
3286 | previous_sample_result = | |
3287 | evaluate_buffer_usage_condition(condition, | |
3288 | previous_sample, channel_info->capacity); | |
3289 | } | |
3290 | latest_sample_result = evaluate_buffer_usage_condition( | |
3291 | condition, latest_sample, | |
3292 | channel_info->capacity); | |
3293 | break; | |
3294 | case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE: | |
3295 | if (caa_likely(previous_sample_available)) { | |
3296 | previous_sample_result = | |
3297 | evaluate_session_consumed_size_condition( | |
3298 | condition, | |
3299 | previous_session_consumed_total); | |
3300 | } | |
3301 | latest_sample_result = | |
3302 | evaluate_session_consumed_size_condition( | |
3303 | condition, | |
3304 | latest_session_consumed_total); | |
3305 | break; | |
3306 | default: | |
3307 | /* Unknown condition type; internal error. */ | |
3308 | abort(); | |
3309 | } | |
ab0ee2ca JG |
3310 | |
3311 | if (!latest_sample_result || | |
3312 | (previous_sample_result == latest_sample_result)) { | |
3313 | /* | |
3314 | * Only trigger on a condition evaluation transition. | |
3315 | * | |
3316 | * NOTE: This edge-triggered logic may not be appropriate for | |
3317 | * future condition types. | |
3318 | */ | |
3319 | goto end; | |
3320 | } | |
3321 | ||
e8360425 JD |
3322 | if (!evaluation || !latest_sample_result) { |
3323 | goto end; | |
3324 | } | |
3325 | ||
3326 | switch (condition_type) { | |
3327 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
3328 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
ab0ee2ca JG |
3329 | *evaluation = lttng_evaluation_buffer_usage_create( |
3330 | condition_type, | |
3331 | latest_sample->highest_usage, | |
e8360425 JD |
3332 | channel_info->capacity); |
3333 | break; | |
3334 | case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE: | |
3335 | *evaluation = lttng_evaluation_session_consumed_size_create( | |
e8360425 JD |
3336 | latest_session_consumed_total); |
3337 | break; | |
3338 | default: | |
3339 | abort(); | |
3340 | } | |
3341 | ||
3342 | if (!*evaluation) { | |
3343 | ret = -1; | |
3344 | goto end; | |
ab0ee2ca JG |
3345 | } |
3346 | end: | |
3347 | return ret; | |
3348 | } | |
3349 | ||
3350 | static | |
d1ba29d2 | 3351 | int client_notification_overflow(struct notification_client *client) |
ab0ee2ca | 3352 | { |
d1ba29d2 JG |
3353 | int ret = 0; |
3354 | const struct lttng_notification_channel_message msg = { | |
ab0ee2ca | 3355 | .type = (int8_t) LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_NOTIFICATION_DROPPED, |
ab0ee2ca JG |
3356 | }; |
3357 | ||
505b2d90 JG |
3358 | ASSERT_LOCKED(client->lock); |
3359 | ||
d1ba29d2 JG |
3360 | DBG("Dropping notification addressed to client (socket fd = %i)", |
3361 | client->socket); | |
3362 | if (client->communication.outbound.dropped_notification) { | |
3363 | /* | |
3364 | * The client already has a "notification dropped" message | |
3365 | * in its outgoing queue. Nothing to do since all | |
3366 | * of those messages are coalesced. | |
3367 | */ | |
3368 | goto end; | |
3369 | } | |
3370 | ||
3371 | client->communication.outbound.dropped_notification = true; | |
ab0ee2ca JG |
3372 | ret = lttng_dynamic_buffer_append( |
3373 | &client->communication.outbound.buffer, &msg, | |
3374 | sizeof(msg)); | |
d1ba29d2 JG |
3375 | if (ret) { |
3376 | PERROR("Failed to enqueue \"dropped notification\" message in client's (socket fd = %i) outgoing queue", | |
3377 | client->socket); | |
3378 | } | |
3379 | end: | |
ab0ee2ca JG |
3380 | return ret; |
3381 | } | |
3382 | ||
d1ba29d2 JG |
3383 | static int client_handle_transmission_status_wrapper( |
3384 | struct notification_client *client, | |
3385 | enum client_transmission_status status, | |
3386 | void *user_data) | |
3387 | { | |
3388 | return client_handle_transmission_status(client, status, | |
3389 | (struct notification_thread_state *) user_data); | |
3390 | } | |
3391 | ||
3392 | static | |
3393 | int send_evaluation_to_clients(const struct lttng_trigger *trigger, | |
3394 | const struct lttng_evaluation *evaluation, | |
3395 | struct notification_client_list* client_list, | |
3396 | struct notification_thread_state *state, | |
3397 | uid_t object_uid, gid_t object_gid) | |
3398 | { | |
3399 | return notification_client_list_send_evaluation(client_list, | |
3400 | lttng_trigger_get_const_condition(trigger), evaluation, | |
3401 | lttng_trigger_get_credentials(trigger), | |
3402 | &(struct lttng_credentials){ | |
3403 | .uid = object_uid, .gid = object_gid}, | |
3404 | client_handle_transmission_status_wrapper, state); | |
3405 | } | |
3406 | ||
f37d0f86 JG |
3407 | /* |
3408 | * Permission checks relative to notification channel clients are performed | |
3409 | * here. Notice how object, client, and trigger credentials are involved in | |
3410 | * this check. | |
3411 | * | |
3412 | * The `object` credentials are the credentials associated with the "subject" | |
3413 | * of a condition. For instance, a `rotation completed` condition applies | |
3414 | * to a session. When that condition is met, it will produce an evaluation | |
3415 | * against a session. Hence, in this case, the `object` credentials are the | |
3416 | * credentials of the "subject" session. | |
3417 | * | |
3418 | * The `trigger` credentials are the credentials of the user that registered the | |
3419 | * trigger. | |
3420 | * | |
3421 | * The `client` credentials are the credentials of the user that created a given | |
3422 | * notification channel. | |
3423 | * | |
3424 | * In terms of visibility, it is expected that non-privilieged users can only | |
3425 | * register triggers against "their" objects (their own sessions and | |
3426 | * applications they are allowed to interact with). They can then open a | |
3427 | * notification channel and subscribe to notifications associated with those | |
3428 | * triggers. | |
3429 | * | |
3430 | * As for privilieged users, they can register triggers against the objects of | |
3431 | * other users. They can then subscribe to the notifications associated to their | |
3432 | * triggers. Privilieged users _can't_ subscribe to the notifications of | |
3433 | * triggers owned by other users; they must create their own triggers. | |
3434 | * | |
3435 | * This is more a concern of usability than security. It would be difficult for | |
3436 | * a root user reliably subscribe to a specific set of conditions without | |
3437 | * interference from external users (those could, for instance, unregister | |
3438 | * their triggers). | |
3439 | */ | |
d1ba29d2 JG |
3440 | LTTNG_HIDDEN |
3441 | int notification_client_list_send_evaluation( | |
3442 | struct notification_client_list *client_list, | |
3443 | const struct lttng_condition *condition, | |
9b63a4aa | 3444 | const struct lttng_evaluation *evaluation, |
d1ba29d2 JG |
3445 | const struct lttng_credentials *trigger_creds, |
3446 | const struct lttng_credentials *source_object_creds, | |
3447 | report_client_transmission_result_cb client_report, | |
3448 | void *user_data) | |
ab0ee2ca JG |
3449 | { |
3450 | int ret = 0; | |
c0a66c84 | 3451 | struct lttng_payload msg_payload; |
ab0ee2ca | 3452 | struct notification_client_list_element *client_list_element, *tmp; |
9b63a4aa | 3453 | const struct lttng_notification notification = { |
d1ba29d2 | 3454 | .condition = (struct lttng_condition *) condition, |
9b63a4aa JG |
3455 | .evaluation = (struct lttng_evaluation *) evaluation, |
3456 | }; | |
3647288f JG |
3457 | struct lttng_notification_channel_message msg_header = { |
3458 | .type = (int8_t) LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_NOTIFICATION, | |
3459 | }; | |
ab0ee2ca | 3460 | |
c0a66c84 | 3461 | lttng_payload_init(&msg_payload); |
ab0ee2ca | 3462 | |
c0a66c84 | 3463 | ret = lttng_dynamic_buffer_append(&msg_payload.buffer, &msg_header, |
3647288f | 3464 | sizeof(msg_header)); |
ab0ee2ca JG |
3465 | if (ret) { |
3466 | goto end; | |
3467 | } | |
3468 | ||
c0a66c84 | 3469 | ret = lttng_notification_serialize(¬ification, &msg_payload); |
ab0ee2ca | 3470 | if (ret) { |
ab0ee2ca JG |
3471 | ERR("[notification-thread] Failed to serialize notification"); |
3472 | ret = -1; | |
3473 | goto end; | |
3474 | } | |
3475 | ||
3647288f | 3476 | /* Update payload size. */ |
505b2d90 JG |
3477 | ((struct lttng_notification_channel_message *) msg_payload.buffer.data) |
3478 | ->size = (uint32_t)( | |
3479 | msg_payload.buffer.size - sizeof(msg_header)); | |
3647288f | 3480 | |
505b2d90 | 3481 | pthread_mutex_lock(&client_list->lock); |
ab0ee2ca JG |
3482 | cds_list_for_each_entry_safe(client_list_element, tmp, |
3483 | &client_list->list, node) { | |
d1ba29d2 | 3484 | enum client_transmission_status transmission_status; |
ab0ee2ca JG |
3485 | struct notification_client *client = |
3486 | client_list_element->client; | |
3487 | ||
505b2d90 JG |
3488 | ret = 0; |
3489 | pthread_mutex_lock(&client->lock); | |
d1ba29d2 JG |
3490 | if (source_object_creds) { |
3491 | if (client->uid != source_object_creds->uid && | |
3492 | client->gid != source_object_creds->gid && | |
3493 | client->uid != 0) { | |
3494 | /* | |
3495 | * Client is not allowed to monitor this | |
3496 | * object. | |
3497 | */ | |
3498 | DBG("[notification-thread] Skipping client at it does not have the object permission to receive notification for this trigger"); | |
3499 | goto unlock_client; | |
3500 | } | |
90843f49 JR |
3501 | } |
3502 | ||
3503 | if (client->uid != trigger_creds->uid && client->gid != trigger_creds->gid) { | |
3504 | DBG("[notification-thread] Skipping client at it does not have the permission to receive notification for this trigger"); | |
505b2d90 | 3505 | goto unlock_client; |
ab0ee2ca JG |
3506 | } |
3507 | ||
3508 | DBG("[notification-thread] Sending notification to client (fd = %i, %zu bytes)", | |
c0a66c84 | 3509 | client->socket, msg_payload.buffer.size); |
ab0ee2ca JG |
3510 | if (client->communication.outbound.buffer.size) { |
3511 | /* | |
3512 | * Outgoing data is already buffered for this client; | |
3513 | * drop the notification and enqueue a "dropped | |
3514 | * notification" message if this is the first dropped | |
3515 | * notification since the socket spilled-over to the | |
3516 | * queue. | |
3517 | */ | |
d1ba29d2 JG |
3518 | ret = client_notification_overflow(client); |
3519 | if (ret) { | |
3520 | goto unlock_client; | |
ab0ee2ca | 3521 | } |
ab0ee2ca JG |
3522 | } |
3523 | ||
3524 | ret = lttng_dynamic_buffer_append_buffer( | |
3525 | &client->communication.outbound.buffer, | |
c0a66c84 | 3526 | &msg_payload.buffer); |
ab0ee2ca | 3527 | if (ret) { |
505b2d90 | 3528 | goto unlock_client; |
ab0ee2ca JG |
3529 | } |
3530 | ||
d1ba29d2 JG |
3531 | transmission_status = client_flush_outgoing_queue(client); |
3532 | ret = client_report(client, transmission_status, user_data); | |
ab0ee2ca | 3533 | if (ret) { |
505b2d90 JG |
3534 | goto unlock_client; |
3535 | } | |
3536 | unlock_client: | |
3537 | pthread_mutex_unlock(&client->lock); | |
3538 | if (ret) { | |
3539 | goto end_unlock_list; | |
ab0ee2ca JG |
3540 | } |
3541 | } | |
3542 | ret = 0; | |
505b2d90 JG |
3543 | |
3544 | end_unlock_list: | |
3545 | pthread_mutex_unlock(&client_list->lock); | |
ab0ee2ca | 3546 | end: |
c0a66c84 | 3547 | lttng_payload_reset(&msg_payload); |
ab0ee2ca JG |
3548 | return ret; |
3549 | } | |
3550 | ||
3551 | int handle_notification_thread_channel_sample( | |
3552 | struct notification_thread_state *state, int pipe, | |
3553 | enum lttng_domain_type domain) | |
3554 | { | |
3555 | int ret = 0; | |
3556 | struct lttcomm_consumer_channel_monitor_msg sample_msg; | |
ab0ee2ca JG |
3557 | struct channel_info *channel_info; |
3558 | struct cds_lfht_node *node; | |
3559 | struct cds_lfht_iter iter; | |
3560 | struct lttng_channel_trigger_list *trigger_list; | |
3561 | struct lttng_trigger_list_element *trigger_list_element; | |
3562 | bool previous_sample_available = false; | |
e8360425 JD |
3563 | struct channel_state_sample previous_sample, latest_sample; |
3564 | uint64_t previous_session_consumed_total, latest_session_consumed_total; | |
d1ba29d2 | 3565 | struct lttng_credentials channel_creds; |
ab0ee2ca JG |
3566 | |
3567 | /* | |
3568 | * The monitoring pipe only holds messages smaller than PIPE_BUF, | |
3569 | * ensuring that read/write of sampling messages are atomic. | |
3570 | */ | |
7c2551ef | 3571 | ret = lttng_read(pipe, &sample_msg, sizeof(sample_msg)); |
ab0ee2ca JG |
3572 | if (ret != sizeof(sample_msg)) { |
3573 | ERR("[notification-thread] Failed to read from monitoring pipe (fd = %i)", | |
3574 | pipe); | |
3575 | ret = -1; | |
3576 | goto end; | |
3577 | } | |
3578 | ||
3579 | ret = 0; | |
3580 | latest_sample.key.key = sample_msg.key; | |
3581 | latest_sample.key.domain = domain; | |
3582 | latest_sample.highest_usage = sample_msg.highest; | |
3583 | latest_sample.lowest_usage = sample_msg.lowest; | |
e8360425 | 3584 | latest_sample.channel_total_consumed = sample_msg.total_consumed; |
ab0ee2ca JG |
3585 | |
3586 | rcu_read_lock(); | |
3587 | ||
3588 | /* Retrieve the channel's informations */ | |
3589 | cds_lfht_lookup(state->channels_ht, | |
3590 | hash_channel_key(&latest_sample.key), | |
3591 | match_channel_info, | |
3592 | &latest_sample.key, | |
3593 | &iter); | |
3594 | node = cds_lfht_iter_get_node(&iter); | |
e0b5f87b | 3595 | if (caa_unlikely(!node)) { |
ab0ee2ca JG |
3596 | /* |
3597 | * Not an error since the consumer can push a sample to the pipe | |
3598 | * and the rest of the session daemon could notify us of the | |
3599 | * channel's destruction before we get a chance to process that | |
3600 | * sample. | |
3601 | */ | |
3602 | DBG("[notification-thread] Received a sample for an unknown channel from consumerd, key = %" PRIu64 " in %s domain", | |
3603 | latest_sample.key.key, | |
3604 | domain == LTTNG_DOMAIN_KERNEL ? "kernel" : | |
3605 | "user space"); | |
3606 | goto end_unlock; | |
3607 | } | |
3608 | channel_info = caa_container_of(node, struct channel_info, | |
3609 | channels_ht_node); | |
e8360425 | 3610 | DBG("[notification-thread] Handling channel sample for channel %s (key = %" PRIu64 ") in session %s (highest usage = %" PRIu64 ", lowest usage = %" PRIu64", total consumed = %" PRIu64")", |
8abe313a | 3611 | channel_info->name, |
ab0ee2ca | 3612 | latest_sample.key.key, |
8abe313a | 3613 | channel_info->session_info->name, |
ab0ee2ca | 3614 | latest_sample.highest_usage, |
e8360425 JD |
3615 | latest_sample.lowest_usage, |
3616 | latest_sample.channel_total_consumed); | |
3617 | ||
3618 | previous_session_consumed_total = | |
3619 | channel_info->session_info->consumed_data_size; | |
ab0ee2ca JG |
3620 | |
3621 | /* Retrieve the channel's last sample, if it exists, and update it. */ | |
3622 | cds_lfht_lookup(state->channel_state_ht, | |
3623 | hash_channel_key(&latest_sample.key), | |
3624 | match_channel_state_sample, | |
3625 | &latest_sample.key, | |
3626 | &iter); | |
3627 | node = cds_lfht_iter_get_node(&iter); | |
e0b5f87b | 3628 | if (caa_likely(node)) { |
ab0ee2ca JG |
3629 | struct channel_state_sample *stored_sample; |
3630 | ||
3631 | /* Update the sample stored. */ | |
3632 | stored_sample = caa_container_of(node, | |
3633 | struct channel_state_sample, | |
3634 | channel_state_ht_node); | |
e8360425 | 3635 | |
ab0ee2ca JG |
3636 | memcpy(&previous_sample, stored_sample, |
3637 | sizeof(previous_sample)); | |
3638 | stored_sample->highest_usage = latest_sample.highest_usage; | |
3639 | stored_sample->lowest_usage = latest_sample.lowest_usage; | |
0f0479d7 | 3640 | stored_sample->channel_total_consumed = latest_sample.channel_total_consumed; |
ab0ee2ca | 3641 | previous_sample_available = true; |
e8360425 JD |
3642 | |
3643 | latest_session_consumed_total = | |
3644 | previous_session_consumed_total + | |
3645 | (latest_sample.channel_total_consumed - previous_sample.channel_total_consumed); | |
ab0ee2ca JG |
3646 | } else { |
3647 | /* | |
3648 | * This is the channel's first sample, allocate space for and | |
3649 | * store the new sample. | |
3650 | */ | |
3651 | struct channel_state_sample *stored_sample; | |
3652 | ||
3653 | stored_sample = zmalloc(sizeof(*stored_sample)); | |
3654 | if (!stored_sample) { | |
3655 | ret = -1; | |
3656 | goto end_unlock; | |
3657 | } | |
3658 | ||
3659 | memcpy(stored_sample, &latest_sample, sizeof(*stored_sample)); | |
3660 | cds_lfht_node_init(&stored_sample->channel_state_ht_node); | |
3661 | cds_lfht_add(state->channel_state_ht, | |
3662 | hash_channel_key(&stored_sample->key), | |
3663 | &stored_sample->channel_state_ht_node); | |
e8360425 JD |
3664 | |
3665 | latest_session_consumed_total = | |
3666 | previous_session_consumed_total + | |
3667 | latest_sample.channel_total_consumed; | |
ab0ee2ca JG |
3668 | } |
3669 | ||
e8360425 JD |
3670 | channel_info->session_info->consumed_data_size = |
3671 | latest_session_consumed_total; | |
3672 | ||
ab0ee2ca JG |
3673 | /* Find triggers associated with this channel. */ |
3674 | cds_lfht_lookup(state->channel_triggers_ht, | |
3675 | hash_channel_key(&latest_sample.key), | |
3676 | match_channel_trigger_list, | |
3677 | &latest_sample.key, | |
3678 | &iter); | |
3679 | node = cds_lfht_iter_get_node(&iter); | |
e0b5f87b | 3680 | if (caa_likely(!node)) { |
ab0ee2ca JG |
3681 | goto end_unlock; |
3682 | } | |
3683 | ||
d1ba29d2 JG |
3684 | channel_creds = (typeof(channel_creds)) { |
3685 | .uid = channel_info->session_info->uid, | |
3686 | .gid = channel_info->session_info->gid, | |
3687 | }; | |
3688 | ||
ab0ee2ca JG |
3689 | trigger_list = caa_container_of(node, struct lttng_channel_trigger_list, |
3690 | channel_triggers_ht_node); | |
3691 | cds_list_for_each_entry(trigger_list_element, &trigger_list->list, | |
e742b055 | 3692 | node) { |
9b63a4aa JG |
3693 | const struct lttng_condition *condition; |
3694 | const struct lttng_action *action; | |
d1ba29d2 | 3695 | struct lttng_trigger *trigger; |
505b2d90 | 3696 | struct notification_client_list *client_list = NULL; |
ab0ee2ca | 3697 | struct lttng_evaluation *evaluation = NULL; |
505b2d90 | 3698 | bool client_list_is_empty; |
d1ba29d2 | 3699 | enum action_executor_status executor_status; |
ab0ee2ca | 3700 | |
505b2d90 | 3701 | ret = 0; |
ab0ee2ca | 3702 | trigger = trigger_list_element->trigger; |
9b63a4aa | 3703 | condition = lttng_trigger_get_const_condition(trigger); |
ab0ee2ca | 3704 | assert(condition); |
9b63a4aa | 3705 | action = lttng_trigger_get_const_action(trigger); |
ab0ee2ca JG |
3706 | |
3707 | /* Notify actions are the only type currently supported. */ | |
9b63a4aa | 3708 | assert(lttng_action_get_type_const(action) == |
ab0ee2ca JG |
3709 | LTTNG_ACTION_TYPE_NOTIFY); |
3710 | ||
3711 | /* | |
3712 | * Check if any client is subscribed to the result of this | |
3713 | * evaluation. | |
3714 | */ | |
ed327204 JG |
3715 | client_list = get_client_list_from_condition(state, condition); |
3716 | assert(client_list); | |
505b2d90 JG |
3717 | client_list_is_empty = cds_list_empty(&client_list->list); |
3718 | if (client_list_is_empty) { | |
ab0ee2ca JG |
3719 | /* |
3720 | * No clients interested in the evaluation's result, | |
3721 | * skip it. | |
3722 | */ | |
505b2d90 | 3723 | goto put_list; |
ab0ee2ca JG |
3724 | } |
3725 | ||
ed327204 | 3726 | ret = evaluate_buffer_condition(condition, &evaluation, state, |
ab0ee2ca | 3727 | previous_sample_available ? &previous_sample : NULL, |
e8360425 JD |
3728 | &latest_sample, |
3729 | previous_session_consumed_total, | |
3730 | latest_session_consumed_total, | |
3731 | channel_info); | |
3732 | if (caa_unlikely(ret)) { | |
505b2d90 | 3733 | goto put_list; |
ab0ee2ca JG |
3734 | } |
3735 | ||
e8360425 | 3736 | if (caa_likely(!evaluation)) { |
505b2d90 | 3737 | goto put_list; |
ab0ee2ca JG |
3738 | } |
3739 | ||
d1ba29d2 JG |
3740 | /* |
3741 | * Ownership of `evaluation` transferred to the action executor | |
3742 | * no matter the result. | |
3743 | */ | |
3744 | executor_status = action_executor_enqueue(state->executor, | |
3745 | trigger, evaluation, &channel_creds, | |
3746 | client_list); | |
3747 | evaluation = NULL; | |
3748 | switch (executor_status) { | |
3749 | case ACTION_EXECUTOR_STATUS_OK: | |
3750 | break; | |
3751 | case ACTION_EXECUTOR_STATUS_ERROR: | |
3752 | case ACTION_EXECUTOR_STATUS_INVALID: | |
3753 | /* | |
3754 | * TODO Add trigger identification (name/id) when | |
3755 | * it is added to the API. | |
3756 | */ | |
3757 | ERR("Fatal error occurred while enqueuing action associated with buffer-condition trigger"); | |
3758 | ret = -1; | |
3759 | goto put_list; | |
3760 | case ACTION_EXECUTOR_STATUS_OVERFLOW: | |
3761 | /* | |
3762 | * TODO Add trigger identification (name/id) when | |
3763 | * it is added to the API. | |
3764 | * | |
3765 | * Not a fatal error. | |
3766 | */ | |
3767 | WARN("No space left when enqueuing action associated with buffer-condition trigger"); | |
3768 | ret = 0; | |
3769 | goto put_list; | |
3770 | default: | |
3771 | abort(); | |
3772 | } | |
3773 | ||
505b2d90 JG |
3774 | put_list: |
3775 | notification_client_list_put(client_list); | |
e0b5f87b | 3776 | if (caa_unlikely(ret)) { |
505b2d90 | 3777 | break; |
ab0ee2ca JG |
3778 | } |
3779 | } | |
3780 | end_unlock: | |
3781 | rcu_read_unlock(); | |
3782 | end: | |
3783 | return ret; | |
3784 | } |