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ab0ee2ca JG |
1 | /* |
2 | * Copyright (C) 2017 - Jérémie Galarneau <jeremie.galarneau@efficios.com> | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms of the GNU General Public License, version 2 only, as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
11 | * more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License along with | |
14 | * this program; if not, write to the Free Software Foundation, Inc., 51 | |
15 | * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
16 | */ | |
17 | ||
18 | #define _LGPL_SOURCE | |
19 | #include <urcu.h> | |
20 | #include <urcu/rculfhash.h> | |
21 | ||
ab0ee2ca JG |
22 | #include <common/defaults.h> |
23 | #include <common/error.h> | |
24 | #include <common/futex.h> | |
25 | #include <common/unix.h> | |
26 | #include <common/dynamic-buffer.h> | |
27 | #include <common/hashtable/utils.h> | |
28 | #include <common/sessiond-comm/sessiond-comm.h> | |
29 | #include <common/macros.h> | |
30 | #include <lttng/condition/condition.h> | |
9b63a4aa | 31 | #include <lttng/action/action-internal.h> |
ab0ee2ca JG |
32 | #include <lttng/notification/notification-internal.h> |
33 | #include <lttng/condition/condition-internal.h> | |
34 | #include <lttng/condition/buffer-usage-internal.h> | |
e8360425 | 35 | #include <lttng/condition/session-consumed-size-internal.h> |
ea9a44f0 | 36 | #include <lttng/condition/session-rotation-internal.h> |
ab0ee2ca | 37 | #include <lttng/notification/channel-internal.h> |
1da26331 | 38 | |
ab0ee2ca JG |
39 | #include <time.h> |
40 | #include <unistd.h> | |
41 | #include <assert.h> | |
42 | #include <inttypes.h> | |
d53ea4e4 | 43 | #include <fcntl.h> |
ab0ee2ca | 44 | |
1da26331 JG |
45 | #include "notification-thread.h" |
46 | #include "notification-thread-events.h" | |
47 | #include "notification-thread-commands.h" | |
48 | #include "lttng-sessiond.h" | |
49 | #include "kernel.h" | |
50 | ||
ab0ee2ca JG |
51 | #define CLIENT_POLL_MASK_IN (LPOLLIN | LPOLLERR | LPOLLHUP | LPOLLRDHUP) |
52 | #define CLIENT_POLL_MASK_IN_OUT (CLIENT_POLL_MASK_IN | LPOLLOUT) | |
53 | ||
54 | struct lttng_trigger_list_element { | |
9e0bb80e JG |
55 | /* No ownership of the trigger object is assumed. */ |
56 | const struct lttng_trigger *trigger; | |
ab0ee2ca JG |
57 | struct cds_list_head node; |
58 | }; | |
59 | ||
60 | struct lttng_channel_trigger_list { | |
61 | struct channel_key channel_key; | |
ea9a44f0 | 62 | /* List of struct lttng_trigger_list_element. */ |
ab0ee2ca | 63 | struct cds_list_head list; |
ea9a44f0 | 64 | /* Node in the channel_triggers_ht */ |
ab0ee2ca JG |
65 | struct cds_lfht_node channel_triggers_ht_node; |
66 | }; | |
67 | ||
ea9a44f0 JG |
68 | /* |
69 | * List of triggers applying to a given session. | |
70 | * | |
71 | * See: | |
72 | * - lttng_session_trigger_list_create() | |
73 | * - lttng_session_trigger_list_build() | |
74 | * - lttng_session_trigger_list_destroy() | |
75 | * - lttng_session_trigger_list_add() | |
76 | */ | |
77 | struct lttng_session_trigger_list { | |
78 | /* | |
79 | * Not owned by this; points to the session_info structure's | |
80 | * session name. | |
81 | */ | |
82 | const char *session_name; | |
83 | /* List of struct lttng_trigger_list_element. */ | |
84 | struct cds_list_head list; | |
85 | /* Node in the session_triggers_ht */ | |
86 | struct cds_lfht_node session_triggers_ht_node; | |
87 | /* | |
88 | * Weak reference to the notification system's session triggers | |
89 | * hashtable. | |
90 | * | |
91 | * The session trigger list structure structure is owned by | |
92 | * the session's session_info. | |
93 | * | |
94 | * The session_info is kept alive the the channel_infos holding a | |
95 | * reference to it (reference counting). When those channels are | |
96 | * destroyed (at runtime or on teardown), the reference they hold | |
97 | * to the session_info are released. On destruction of session_info, | |
98 | * session_info_destroy() will remove the list of triggers applying | |
99 | * to this session from the notification system's state. | |
100 | * | |
101 | * This implies that the session_triggers_ht must be destroyed | |
102 | * after the channels. | |
103 | */ | |
104 | struct cds_lfht *session_triggers_ht; | |
105 | /* Used for delayed RCU reclaim. */ | |
106 | struct rcu_head rcu_node; | |
107 | }; | |
108 | ||
ab0ee2ca JG |
109 | struct lttng_trigger_ht_element { |
110 | struct lttng_trigger *trigger; | |
111 | struct cds_lfht_node node; | |
112 | }; | |
113 | ||
114 | struct lttng_condition_list_element { | |
115 | struct lttng_condition *condition; | |
116 | struct cds_list_head node; | |
117 | }; | |
118 | ||
119 | struct notification_client_list_element { | |
120 | struct notification_client *client; | |
121 | struct cds_list_head node; | |
122 | }; | |
123 | ||
124 | struct notification_client_list { | |
125 | struct lttng_trigger *trigger; | |
126 | struct cds_list_head list; | |
127 | struct cds_lfht_node notification_trigger_ht_node; | |
128 | }; | |
129 | ||
130 | struct notification_client { | |
131 | int socket; | |
132 | /* Client protocol version. */ | |
133 | uint8_t major, minor; | |
134 | uid_t uid; | |
135 | gid_t gid; | |
136 | /* | |
5332364f | 137 | * Indicates if the credentials and versions of the client have been |
ab0ee2ca JG |
138 | * checked. |
139 | */ | |
140 | bool validated; | |
141 | /* | |
142 | * Conditions to which the client's notification channel is subscribed. | |
143 | * List of struct lttng_condition_list_node. The condition member is | |
144 | * owned by the client. | |
145 | */ | |
146 | struct cds_list_head condition_list; | |
147 | struct cds_lfht_node client_socket_ht_node; | |
148 | struct { | |
149 | struct { | |
14fa22f8 JG |
150 | /* |
151 | * During the reception of a message, the reception | |
152 | * buffers' "size" is set to contain the current | |
153 | * message's complete payload. | |
154 | */ | |
ab0ee2ca JG |
155 | struct lttng_dynamic_buffer buffer; |
156 | /* Bytes left to receive for the current message. */ | |
157 | size_t bytes_to_receive; | |
158 | /* Type of the message being received. */ | |
159 | enum lttng_notification_channel_message_type msg_type; | |
160 | /* | |
161 | * Indicates whether or not credentials are expected | |
162 | * from the client. | |
163 | */ | |
01ea340e | 164 | bool expect_creds; |
ab0ee2ca JG |
165 | /* |
166 | * Indicates whether or not credentials were received | |
167 | * from the client. | |
168 | */ | |
169 | bool creds_received; | |
14fa22f8 | 170 | /* Only used during credentials reception. */ |
ab0ee2ca JG |
171 | lttng_sock_cred creds; |
172 | } inbound; | |
173 | struct { | |
174 | /* | |
175 | * Indicates whether or not a notification addressed to | |
176 | * this client was dropped because a command reply was | |
177 | * already buffered. | |
178 | * | |
179 | * A notification is dropped whenever the buffer is not | |
180 | * empty. | |
181 | */ | |
182 | bool dropped_notification; | |
183 | /* | |
184 | * Indicates whether or not a command reply is already | |
185 | * buffered. In this case, it means that the client is | |
186 | * not consuming command replies before emitting a new | |
187 | * one. This could be caused by a protocol error or a | |
188 | * misbehaving/malicious client. | |
189 | */ | |
190 | bool queued_command_reply; | |
191 | struct lttng_dynamic_buffer buffer; | |
192 | } outbound; | |
193 | } communication; | |
194 | }; | |
195 | ||
196 | struct channel_state_sample { | |
197 | struct channel_key key; | |
198 | struct cds_lfht_node channel_state_ht_node; | |
199 | uint64_t highest_usage; | |
200 | uint64_t lowest_usage; | |
e8360425 | 201 | uint64_t channel_total_consumed; |
ab0ee2ca JG |
202 | }; |
203 | ||
e4db5ace | 204 | static unsigned long hash_channel_key(struct channel_key *key); |
e8360425 | 205 | static int evaluate_condition(const struct lttng_condition *condition, |
e4db5ace | 206 | struct lttng_evaluation **evaluation, |
e8360425 JD |
207 | const struct notification_thread_state *state, |
208 | const struct channel_state_sample *previous_sample, | |
209 | const struct channel_state_sample *latest_sample, | |
210 | uint64_t previous_session_consumed_total, | |
211 | uint64_t latest_session_consumed_total, | |
212 | struct channel_info *channel_info); | |
e4db5ace | 213 | static |
9b63a4aa JG |
214 | int send_evaluation_to_clients(const struct lttng_trigger *trigger, |
215 | const struct lttng_evaluation *evaluation, | |
e4db5ace JR |
216 | struct notification_client_list *client_list, |
217 | struct notification_thread_state *state, | |
218 | uid_t channel_uid, gid_t channel_gid); | |
219 | ||
8abe313a | 220 | |
ea9a44f0 | 221 | /* session_info API */ |
8abe313a JG |
222 | static |
223 | void session_info_destroy(void *_data); | |
224 | static | |
225 | void session_info_get(struct session_info *session_info); | |
226 | static | |
227 | void session_info_put(struct session_info *session_info); | |
228 | static | |
229 | struct session_info *session_info_create(const char *name, | |
ea9a44f0 JG |
230 | uid_t uid, gid_t gid, |
231 | struct lttng_session_trigger_list *trigger_list); | |
8abe313a JG |
232 | static |
233 | void session_info_add_channel(struct session_info *session_info, | |
234 | struct channel_info *channel_info); | |
235 | static | |
236 | void session_info_remove_channel(struct session_info *session_info, | |
237 | struct channel_info *channel_info); | |
238 | ||
ea9a44f0 JG |
239 | /* lttng_session_trigger_list API */ |
240 | static | |
241 | struct lttng_session_trigger_list *lttng_session_trigger_list_create( | |
242 | const char *session_name, | |
243 | struct cds_lfht *session_triggers_ht); | |
244 | static | |
245 | struct lttng_session_trigger_list *lttng_session_trigger_list_build( | |
246 | const struct notification_thread_state *state, | |
247 | const char *session_name); | |
248 | static | |
249 | void lttng_session_trigger_list_destroy( | |
250 | struct lttng_session_trigger_list *list); | |
251 | static | |
252 | int lttng_session_trigger_list_add(struct lttng_session_trigger_list *list, | |
253 | const struct lttng_trigger *trigger); | |
254 | ||
255 | ||
ab0ee2ca JG |
256 | static |
257 | int match_client(struct cds_lfht_node *node, const void *key) | |
258 | { | |
259 | /* This double-cast is intended to supress pointer-to-cast warning. */ | |
260 | int socket = (int) (intptr_t) key; | |
261 | struct notification_client *client; | |
262 | ||
263 | client = caa_container_of(node, struct notification_client, | |
264 | client_socket_ht_node); | |
265 | ||
266 | return !!(client->socket == socket); | |
267 | } | |
268 | ||
269 | static | |
270 | int match_channel_trigger_list(struct cds_lfht_node *node, const void *key) | |
271 | { | |
272 | struct channel_key *channel_key = (struct channel_key *) key; | |
273 | struct lttng_channel_trigger_list *trigger_list; | |
274 | ||
275 | trigger_list = caa_container_of(node, struct lttng_channel_trigger_list, | |
276 | channel_triggers_ht_node); | |
277 | ||
278 | return !!((channel_key->key == trigger_list->channel_key.key) && | |
279 | (channel_key->domain == trigger_list->channel_key.domain)); | |
280 | } | |
281 | ||
282 | static | |
283 | int match_channel_state_sample(struct cds_lfht_node *node, const void *key) | |
284 | { | |
285 | struct channel_key *channel_key = (struct channel_key *) key; | |
286 | struct channel_state_sample *sample; | |
287 | ||
288 | sample = caa_container_of(node, struct channel_state_sample, | |
289 | channel_state_ht_node); | |
290 | ||
291 | return !!((channel_key->key == sample->key.key) && | |
292 | (channel_key->domain == sample->key.domain)); | |
293 | } | |
294 | ||
295 | static | |
296 | int match_channel_info(struct cds_lfht_node *node, const void *key) | |
297 | { | |
298 | struct channel_key *channel_key = (struct channel_key *) key; | |
299 | struct channel_info *channel_info; | |
300 | ||
301 | channel_info = caa_container_of(node, struct channel_info, | |
302 | channels_ht_node); | |
303 | ||
304 | return !!((channel_key->key == channel_info->key.key) && | |
305 | (channel_key->domain == channel_info->key.domain)); | |
306 | } | |
307 | ||
308 | static | |
309 | int match_condition(struct cds_lfht_node *node, const void *key) | |
310 | { | |
311 | struct lttng_condition *condition_key = (struct lttng_condition *) key; | |
312 | struct lttng_trigger_ht_element *trigger; | |
313 | struct lttng_condition *condition; | |
314 | ||
315 | trigger = caa_container_of(node, struct lttng_trigger_ht_element, | |
316 | node); | |
317 | condition = lttng_trigger_get_condition(trigger->trigger); | |
318 | assert(condition); | |
319 | ||
320 | return !!lttng_condition_is_equal(condition_key, condition); | |
321 | } | |
322 | ||
323 | static | |
324 | int match_client_list(struct cds_lfht_node *node, const void *key) | |
325 | { | |
326 | struct lttng_trigger *trigger_key = (struct lttng_trigger *) key; | |
327 | struct notification_client_list *client_list; | |
328 | struct lttng_condition *condition; | |
329 | struct lttng_condition *condition_key = lttng_trigger_get_condition( | |
330 | trigger_key); | |
331 | ||
332 | assert(condition_key); | |
333 | ||
334 | client_list = caa_container_of(node, struct notification_client_list, | |
335 | notification_trigger_ht_node); | |
336 | condition = lttng_trigger_get_condition(client_list->trigger); | |
337 | ||
338 | return !!lttng_condition_is_equal(condition_key, condition); | |
339 | } | |
340 | ||
341 | static | |
342 | int match_client_list_condition(struct cds_lfht_node *node, const void *key) | |
343 | { | |
344 | struct lttng_condition *condition_key = (struct lttng_condition *) key; | |
345 | struct notification_client_list *client_list; | |
346 | struct lttng_condition *condition; | |
347 | ||
348 | assert(condition_key); | |
349 | ||
350 | client_list = caa_container_of(node, struct notification_client_list, | |
351 | notification_trigger_ht_node); | |
352 | condition = lttng_trigger_get_condition(client_list->trigger); | |
353 | ||
354 | return !!lttng_condition_is_equal(condition_key, condition); | |
355 | } | |
356 | ||
357 | static | |
358 | unsigned long lttng_condition_buffer_usage_hash( | |
9b63a4aa | 359 | const struct lttng_condition *_condition) |
ab0ee2ca | 360 | { |
9a2746aa JG |
361 | unsigned long hash; |
362 | unsigned long condition_type; | |
ab0ee2ca JG |
363 | struct lttng_condition_buffer_usage *condition; |
364 | ||
365 | condition = container_of(_condition, | |
366 | struct lttng_condition_buffer_usage, parent); | |
367 | ||
9a2746aa JG |
368 | condition_type = (unsigned long) condition->parent.type; |
369 | hash = hash_key_ulong((void *) condition_type, lttng_ht_seed); | |
ab0ee2ca JG |
370 | if (condition->session_name) { |
371 | hash ^= hash_key_str(condition->session_name, lttng_ht_seed); | |
372 | } | |
373 | if (condition->channel_name) { | |
8f56701f | 374 | hash ^= hash_key_str(condition->channel_name, lttng_ht_seed); |
ab0ee2ca JG |
375 | } |
376 | if (condition->domain.set) { | |
377 | hash ^= hash_key_ulong( | |
378 | (void *) condition->domain.type, | |
379 | lttng_ht_seed); | |
380 | } | |
381 | if (condition->threshold_ratio.set) { | |
382 | uint64_t val; | |
383 | ||
384 | val = condition->threshold_ratio.value * (double) UINT32_MAX; | |
385 | hash ^= hash_key_u64(&val, lttng_ht_seed); | |
6633b0dd | 386 | } else if (condition->threshold_bytes.set) { |
ab0ee2ca JG |
387 | uint64_t val; |
388 | ||
389 | val = condition->threshold_bytes.value; | |
390 | hash ^= hash_key_u64(&val, lttng_ht_seed); | |
391 | } | |
392 | return hash; | |
393 | } | |
394 | ||
e8360425 JD |
395 | static |
396 | unsigned long lttng_condition_session_consumed_size_hash( | |
9b63a4aa | 397 | const struct lttng_condition *_condition) |
e8360425 | 398 | { |
9a2746aa JG |
399 | unsigned long hash; |
400 | unsigned long condition_type = | |
401 | (unsigned long) LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE; | |
e8360425 JD |
402 | struct lttng_condition_session_consumed_size *condition; |
403 | uint64_t val; | |
404 | ||
405 | condition = container_of(_condition, | |
406 | struct lttng_condition_session_consumed_size, parent); | |
407 | ||
9a2746aa | 408 | hash = hash_key_ulong((void *) condition_type, lttng_ht_seed); |
e8360425 JD |
409 | if (condition->session_name) { |
410 | hash ^= hash_key_str(condition->session_name, lttng_ht_seed); | |
411 | } | |
412 | val = condition->consumed_threshold_bytes.value; | |
413 | hash ^= hash_key_u64(&val, lttng_ht_seed); | |
414 | return hash; | |
415 | } | |
416 | ||
a8393880 JG |
417 | static |
418 | unsigned long lttng_condition_session_rotation_hash( | |
419 | const struct lttng_condition *_condition) | |
420 | { | |
421 | unsigned long hash, condition_type; | |
422 | struct lttng_condition_session_rotation *condition; | |
423 | ||
424 | condition = container_of(_condition, | |
425 | struct lttng_condition_session_rotation, parent); | |
426 | condition_type = (unsigned long) condition->parent.type; | |
427 | hash = hash_key_ulong((void *) condition_type, lttng_ht_seed); | |
428 | assert(condition->session_name); | |
429 | hash ^= hash_key_str(condition->session_name, lttng_ht_seed); | |
430 | return hash; | |
431 | } | |
9a2746aa | 432 | |
ab0ee2ca JG |
433 | /* |
434 | * The lttng_condition hashing code is kept in this file (rather than | |
435 | * condition.c) since it makes use of GPLv2 code (hashtable utils), which we | |
436 | * don't want to link in liblttng-ctl. | |
437 | */ | |
438 | static | |
9b63a4aa | 439 | unsigned long lttng_condition_hash(const struct lttng_condition *condition) |
ab0ee2ca JG |
440 | { |
441 | switch (condition->type) { | |
442 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
443 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
444 | return lttng_condition_buffer_usage_hash(condition); | |
e8360425 JD |
445 | case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE: |
446 | return lttng_condition_session_consumed_size_hash(condition); | |
a8393880 JG |
447 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING: |
448 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED: | |
449 | return lttng_condition_session_rotation_hash(condition); | |
ab0ee2ca JG |
450 | default: |
451 | ERR("[notification-thread] Unexpected condition type caught"); | |
452 | abort(); | |
453 | } | |
454 | } | |
455 | ||
e4db5ace JR |
456 | static |
457 | unsigned long hash_channel_key(struct channel_key *key) | |
458 | { | |
459 | unsigned long key_hash = hash_key_u64(&key->key, lttng_ht_seed); | |
460 | unsigned long domain_hash = hash_key_ulong( | |
461 | (void *) (unsigned long) key->domain, lttng_ht_seed); | |
462 | ||
463 | return key_hash ^ domain_hash; | |
464 | } | |
465 | ||
ab0ee2ca JG |
466 | static |
467 | void channel_info_destroy(struct channel_info *channel_info) | |
468 | { | |
469 | if (!channel_info) { | |
470 | return; | |
471 | } | |
472 | ||
8abe313a JG |
473 | if (channel_info->session_info) { |
474 | session_info_remove_channel(channel_info->session_info, | |
475 | channel_info); | |
476 | session_info_put(channel_info->session_info); | |
ab0ee2ca | 477 | } |
8abe313a JG |
478 | if (channel_info->name) { |
479 | free(channel_info->name); | |
ab0ee2ca JG |
480 | } |
481 | free(channel_info); | |
482 | } | |
483 | ||
8abe313a | 484 | /* Don't call directly, use the ref-counting mechanism. */ |
ab0ee2ca | 485 | static |
8abe313a | 486 | void session_info_destroy(void *_data) |
ab0ee2ca | 487 | { |
8abe313a | 488 | struct session_info *session_info = _data; |
3b68d0a3 | 489 | int ret; |
ab0ee2ca | 490 | |
8abe313a JG |
491 | assert(session_info); |
492 | if (session_info->channel_infos_ht) { | |
3b68d0a3 JR |
493 | ret = cds_lfht_destroy(session_info->channel_infos_ht, NULL); |
494 | if (ret) { | |
4c3f302b | 495 | ERR("[notification-thread] Failed to destroy channel information hash table"); |
3b68d0a3 | 496 | } |
8abe313a | 497 | } |
ea9a44f0 | 498 | lttng_session_trigger_list_destroy(session_info->trigger_list); |
8abe313a JG |
499 | free(session_info->name); |
500 | free(session_info); | |
501 | } | |
ab0ee2ca | 502 | |
8abe313a JG |
503 | static |
504 | void session_info_get(struct session_info *session_info) | |
505 | { | |
506 | if (!session_info) { | |
507 | return; | |
508 | } | |
509 | lttng_ref_get(&session_info->ref); | |
510 | } | |
511 | ||
512 | static | |
513 | void session_info_put(struct session_info *session_info) | |
514 | { | |
515 | if (!session_info) { | |
516 | return; | |
ab0ee2ca | 517 | } |
8abe313a JG |
518 | lttng_ref_put(&session_info->ref); |
519 | } | |
520 | ||
521 | static | |
ea9a44f0 JG |
522 | struct session_info *session_info_create(const char *name, uid_t uid, gid_t gid, |
523 | struct lttng_session_trigger_list *trigger_list) | |
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; |
8abe313a JG |
549 | end: |
550 | return session_info; | |
551 | error: | |
552 | session_info_put(session_info); | |
553 | return NULL; | |
554 | } | |
555 | ||
556 | static | |
557 | void session_info_add_channel(struct session_info *session_info, | |
558 | struct channel_info *channel_info) | |
559 | { | |
560 | rcu_read_lock(); | |
561 | cds_lfht_add(session_info->channel_infos_ht, | |
562 | hash_channel_key(&channel_info->key), | |
563 | &channel_info->session_info_channels_ht_node); | |
564 | rcu_read_unlock(); | |
565 | } | |
566 | ||
567 | static | |
568 | void session_info_remove_channel(struct session_info *session_info, | |
569 | struct channel_info *channel_info) | |
570 | { | |
571 | rcu_read_lock(); | |
572 | cds_lfht_del(session_info->channel_infos_ht, | |
573 | &channel_info->session_info_channels_ht_node); | |
574 | rcu_read_unlock(); | |
575 | } | |
576 | ||
577 | static | |
578 | struct channel_info *channel_info_create(const char *channel_name, | |
579 | struct channel_key *channel_key, uint64_t channel_capacity, | |
580 | struct session_info *session_info) | |
581 | { | |
582 | struct channel_info *channel_info = zmalloc(sizeof(*channel_info)); | |
583 | ||
584 | if (!channel_info) { | |
585 | goto end; | |
586 | } | |
587 | ||
ab0ee2ca | 588 | cds_lfht_node_init(&channel_info->channels_ht_node); |
8abe313a JG |
589 | cds_lfht_node_init(&channel_info->session_info_channels_ht_node); |
590 | memcpy(&channel_info->key, channel_key, sizeof(*channel_key)); | |
591 | channel_info->capacity = channel_capacity; | |
592 | ||
593 | channel_info->name = strdup(channel_name); | |
594 | if (!channel_info->name) { | |
595 | goto error; | |
596 | } | |
597 | ||
598 | /* | |
599 | * Set the references between session and channel infos: | |
600 | * - channel_info holds a strong reference to session_info | |
601 | * - session_info holds a weak reference to channel_info | |
602 | */ | |
603 | session_info_get(session_info); | |
604 | session_info_add_channel(session_info, channel_info); | |
605 | channel_info->session_info = session_info; | |
ab0ee2ca | 606 | end: |
8abe313a | 607 | return channel_info; |
ab0ee2ca | 608 | error: |
8abe313a | 609 | channel_info_destroy(channel_info); |
ab0ee2ca JG |
610 | return NULL; |
611 | } | |
612 | ||
e4db5ace JR |
613 | /* This function must be called with the RCU read lock held. */ |
614 | static | |
615 | int evaluate_condition_for_client(struct lttng_trigger *trigger, | |
616 | struct lttng_condition *condition, | |
617 | struct notification_client *client, | |
618 | struct notification_thread_state *state) | |
619 | { | |
620 | int ret; | |
621 | struct cds_lfht_iter iter; | |
622 | struct cds_lfht_node *node; | |
623 | struct channel_info *channel_info = NULL; | |
624 | struct channel_key *channel_key = NULL; | |
625 | struct channel_state_sample *last_sample = NULL; | |
626 | struct lttng_channel_trigger_list *channel_trigger_list = NULL; | |
627 | struct lttng_evaluation *evaluation = NULL; | |
628 | struct notification_client_list client_list = { 0 }; | |
629 | struct notification_client_list_element client_list_element = { 0 }; | |
630 | ||
631 | assert(trigger); | |
632 | assert(condition); | |
633 | assert(client); | |
634 | assert(state); | |
635 | ||
636 | /* Find the channel associated with the trigger. */ | |
637 | cds_lfht_for_each_entry(state->channel_triggers_ht, &iter, | |
638 | channel_trigger_list , channel_triggers_ht_node) { | |
639 | struct lttng_trigger_list_element *element; | |
640 | ||
641 | cds_list_for_each_entry(element, &channel_trigger_list->list, node) { | |
9b63a4aa JG |
642 | const struct lttng_condition *current_condition = |
643 | lttng_trigger_get_const_condition( | |
e4db5ace JR |
644 | element->trigger); |
645 | ||
646 | assert(current_condition); | |
647 | if (!lttng_condition_is_equal(condition, | |
2ae99f0b | 648 | current_condition)) { |
e4db5ace JR |
649 | continue; |
650 | } | |
651 | ||
652 | /* Found the trigger, save the channel key. */ | |
653 | channel_key = &channel_trigger_list->channel_key; | |
654 | break; | |
655 | } | |
656 | if (channel_key) { | |
657 | /* The channel key was found stop iteration. */ | |
658 | break; | |
659 | } | |
660 | } | |
661 | ||
662 | if (!channel_key){ | |
663 | /* No channel found; normal exit. */ | |
664 | DBG("[notification-thread] No channel associated with newly subscribed-to condition"); | |
665 | ret = 0; | |
666 | goto end; | |
667 | } | |
668 | ||
669 | /* Fetch channel info for the matching channel. */ | |
670 | cds_lfht_lookup(state->channels_ht, | |
671 | hash_channel_key(channel_key), | |
672 | match_channel_info, | |
673 | channel_key, | |
674 | &iter); | |
675 | node = cds_lfht_iter_get_node(&iter); | |
676 | assert(node); | |
677 | channel_info = caa_container_of(node, struct channel_info, | |
678 | channels_ht_node); | |
679 | ||
680 | /* Retrieve the channel's last sample, if it exists. */ | |
681 | cds_lfht_lookup(state->channel_state_ht, | |
682 | hash_channel_key(channel_key), | |
683 | match_channel_state_sample, | |
684 | channel_key, | |
685 | &iter); | |
686 | node = cds_lfht_iter_get_node(&iter); | |
687 | if (node) { | |
688 | last_sample = caa_container_of(node, | |
689 | struct channel_state_sample, | |
690 | channel_state_ht_node); | |
691 | } else { | |
692 | /* Nothing to evaluate, no sample was ever taken. Normal exit */ | |
693 | DBG("[notification-thread] No channel sample associated with newly subscribed-to condition"); | |
694 | ret = 0; | |
695 | goto end; | |
696 | } | |
697 | ||
e8360425 JD |
698 | ret = evaluate_condition(condition, &evaluation, state, |
699 | NULL, last_sample, | |
700 | 0, channel_info->session_info->consumed_data_size, | |
701 | channel_info); | |
e4db5ace | 702 | if (ret) { |
066a3c82 | 703 | WARN("[notification-thread] Fatal error occurred while evaluating a newly subscribed-to condition"); |
e4db5ace JR |
704 | goto end; |
705 | } | |
706 | ||
707 | if (!evaluation) { | |
708 | /* Evaluation yielded nothing. Normal exit. */ | |
709 | DBG("[notification-thread] Newly subscribed-to condition evaluated to false, nothing to report to client"); | |
710 | ret = 0; | |
711 | goto end; | |
712 | } | |
713 | ||
714 | /* | |
715 | * Create a temporary client list with the client currently | |
716 | * subscribing. | |
717 | */ | |
718 | cds_lfht_node_init(&client_list.notification_trigger_ht_node); | |
719 | CDS_INIT_LIST_HEAD(&client_list.list); | |
720 | client_list.trigger = trigger; | |
721 | ||
722 | CDS_INIT_LIST_HEAD(&client_list_element.node); | |
723 | client_list_element.client = client; | |
724 | cds_list_add(&client_list_element.node, &client_list.list); | |
725 | ||
726 | /* Send evaluation result to the newly-subscribed client. */ | |
727 | DBG("[notification-thread] Newly subscribed-to condition evaluated to true, notifying client"); | |
728 | ret = send_evaluation_to_clients(trigger, evaluation, &client_list, | |
8abe313a JG |
729 | state, channel_info->session_info->uid, |
730 | channel_info->session_info->gid); | |
e4db5ace JR |
731 | |
732 | end: | |
733 | return ret; | |
734 | } | |
735 | ||
ab0ee2ca JG |
736 | static |
737 | int notification_thread_client_subscribe(struct notification_client *client, | |
738 | struct lttng_condition *condition, | |
739 | struct notification_thread_state *state, | |
740 | enum lttng_notification_channel_status *_status) | |
741 | { | |
742 | int ret = 0; | |
743 | struct cds_lfht_iter iter; | |
744 | struct cds_lfht_node *node; | |
745 | struct notification_client_list *client_list; | |
746 | struct lttng_condition_list_element *condition_list_element = NULL; | |
747 | struct notification_client_list_element *client_list_element = NULL; | |
748 | enum lttng_notification_channel_status status = | |
749 | LTTNG_NOTIFICATION_CHANNEL_STATUS_OK; | |
750 | ||
751 | /* | |
752 | * Ensure that the client has not already subscribed to this condition | |
753 | * before. | |
754 | */ | |
755 | cds_list_for_each_entry(condition_list_element, &client->condition_list, node) { | |
756 | if (lttng_condition_is_equal(condition_list_element->condition, | |
757 | condition)) { | |
758 | status = LTTNG_NOTIFICATION_CHANNEL_STATUS_ALREADY_SUBSCRIBED; | |
759 | goto end; | |
760 | } | |
761 | } | |
762 | ||
763 | condition_list_element = zmalloc(sizeof(*condition_list_element)); | |
764 | if (!condition_list_element) { | |
765 | ret = -1; | |
766 | goto error; | |
767 | } | |
768 | client_list_element = zmalloc(sizeof(*client_list_element)); | |
769 | if (!client_list_element) { | |
770 | ret = -1; | |
771 | goto error; | |
772 | } | |
773 | ||
774 | rcu_read_lock(); | |
775 | ||
776 | /* | |
777 | * Add the newly-subscribed condition to the client's subscription list. | |
778 | */ | |
779 | CDS_INIT_LIST_HEAD(&condition_list_element->node); | |
780 | condition_list_element->condition = condition; | |
781 | cds_list_add(&condition_list_element->node, &client->condition_list); | |
782 | ||
ab0ee2ca JG |
783 | cds_lfht_lookup(state->notification_trigger_clients_ht, |
784 | lttng_condition_hash(condition), | |
785 | match_client_list_condition, | |
786 | condition, | |
787 | &iter); | |
788 | node = cds_lfht_iter_get_node(&iter); | |
789 | if (!node) { | |
2ae99f0b JG |
790 | /* |
791 | * No notification-emiting trigger registered with this | |
792 | * condition. We don't evaluate the condition right away | |
793 | * since this trigger is not registered yet. | |
794 | */ | |
4fb43b68 | 795 | free(client_list_element); |
ab0ee2ca JG |
796 | goto end_unlock; |
797 | } | |
798 | ||
799 | client_list = caa_container_of(node, struct notification_client_list, | |
800 | notification_trigger_ht_node); | |
2ae99f0b JG |
801 | /* |
802 | * The condition to which the client just subscribed is evaluated | |
803 | * at this point so that conditions that are already TRUE result | |
804 | * in a notification being sent out. | |
805 | */ | |
e4db5ace JR |
806 | if (evaluate_condition_for_client(client_list->trigger, condition, |
807 | client, state)) { | |
808 | WARN("[notification-thread] Evaluation of a condition on client subscription failed, aborting."); | |
809 | ret = -1; | |
4bd5b4af | 810 | free(client_list_element); |
e4db5ace JR |
811 | goto end_unlock; |
812 | } | |
813 | ||
814 | /* | |
815 | * Add the client to the list of clients interested in a given trigger | |
816 | * if a "notification" trigger with a corresponding condition was | |
817 | * added prior. | |
818 | */ | |
ab0ee2ca JG |
819 | client_list_element->client = client; |
820 | CDS_INIT_LIST_HEAD(&client_list_element->node); | |
821 | cds_list_add(&client_list_element->node, &client_list->list); | |
822 | end_unlock: | |
823 | rcu_read_unlock(); | |
824 | end: | |
825 | if (_status) { | |
826 | *_status = status; | |
827 | } | |
828 | return ret; | |
829 | error: | |
830 | free(condition_list_element); | |
831 | free(client_list_element); | |
832 | return ret; | |
833 | } | |
834 | ||
835 | static | |
836 | int notification_thread_client_unsubscribe( | |
837 | struct notification_client *client, | |
838 | struct lttng_condition *condition, | |
839 | struct notification_thread_state *state, | |
840 | enum lttng_notification_channel_status *_status) | |
841 | { | |
842 | struct cds_lfht_iter iter; | |
843 | struct cds_lfht_node *node; | |
844 | struct notification_client_list *client_list; | |
845 | struct lttng_condition_list_element *condition_list_element, | |
846 | *condition_tmp; | |
847 | struct notification_client_list_element *client_list_element, | |
848 | *client_tmp; | |
849 | bool condition_found = false; | |
850 | enum lttng_notification_channel_status status = | |
851 | LTTNG_NOTIFICATION_CHANNEL_STATUS_OK; | |
852 | ||
853 | /* Remove the condition from the client's condition list. */ | |
854 | cds_list_for_each_entry_safe(condition_list_element, condition_tmp, | |
855 | &client->condition_list, node) { | |
856 | if (!lttng_condition_is_equal(condition_list_element->condition, | |
857 | condition)) { | |
858 | continue; | |
859 | } | |
860 | ||
861 | cds_list_del(&condition_list_element->node); | |
862 | /* | |
863 | * The caller may be iterating on the client's conditions to | |
864 | * tear down a client's connection. In this case, the condition | |
865 | * will be destroyed at the end. | |
866 | */ | |
867 | if (condition != condition_list_element->condition) { | |
868 | lttng_condition_destroy( | |
869 | condition_list_element->condition); | |
870 | } | |
871 | free(condition_list_element); | |
872 | condition_found = true; | |
873 | break; | |
874 | } | |
875 | ||
876 | if (!condition_found) { | |
877 | status = LTTNG_NOTIFICATION_CHANNEL_STATUS_UNKNOWN_CONDITION; | |
878 | goto end; | |
879 | } | |
880 | ||
881 | /* | |
882 | * Remove the client from the list of clients interested the trigger | |
883 | * matching the condition. | |
884 | */ | |
885 | rcu_read_lock(); | |
886 | cds_lfht_lookup(state->notification_trigger_clients_ht, | |
887 | lttng_condition_hash(condition), | |
888 | match_client_list_condition, | |
889 | condition, | |
890 | &iter); | |
891 | node = cds_lfht_iter_get_node(&iter); | |
892 | if (!node) { | |
893 | goto end_unlock; | |
894 | } | |
895 | ||
896 | client_list = caa_container_of(node, struct notification_client_list, | |
897 | notification_trigger_ht_node); | |
898 | cds_list_for_each_entry_safe(client_list_element, client_tmp, | |
899 | &client_list->list, node) { | |
900 | if (client_list_element->client->socket != client->socket) { | |
901 | continue; | |
902 | } | |
903 | cds_list_del(&client_list_element->node); | |
904 | free(client_list_element); | |
905 | break; | |
906 | } | |
907 | end_unlock: | |
908 | rcu_read_unlock(); | |
909 | end: | |
910 | lttng_condition_destroy(condition); | |
911 | if (_status) { | |
912 | *_status = status; | |
913 | } | |
914 | return 0; | |
915 | } | |
916 | ||
917 | static | |
918 | void notification_client_destroy(struct notification_client *client, | |
919 | struct notification_thread_state *state) | |
920 | { | |
921 | struct lttng_condition_list_element *condition_list_element, *tmp; | |
922 | ||
923 | if (!client) { | |
924 | return; | |
925 | } | |
926 | ||
927 | /* Release all conditions to which the client was subscribed. */ | |
928 | cds_list_for_each_entry_safe(condition_list_element, tmp, | |
929 | &client->condition_list, node) { | |
930 | (void) notification_thread_client_unsubscribe(client, | |
931 | condition_list_element->condition, state, NULL); | |
932 | } | |
933 | ||
934 | if (client->socket >= 0) { | |
935 | (void) lttcomm_close_unix_sock(client->socket); | |
936 | } | |
937 | lttng_dynamic_buffer_reset(&client->communication.inbound.buffer); | |
938 | lttng_dynamic_buffer_reset(&client->communication.outbound.buffer); | |
939 | free(client); | |
940 | } | |
941 | ||
942 | /* | |
943 | * Call with rcu_read_lock held (and hold for the lifetime of the returned | |
944 | * client pointer). | |
945 | */ | |
946 | static | |
947 | struct notification_client *get_client_from_socket(int socket, | |
948 | struct notification_thread_state *state) | |
949 | { | |
950 | struct cds_lfht_iter iter; | |
951 | struct cds_lfht_node *node; | |
952 | struct notification_client *client = NULL; | |
953 | ||
954 | cds_lfht_lookup(state->client_socket_ht, | |
955 | hash_key_ulong((void *) (unsigned long) socket, lttng_ht_seed), | |
956 | match_client, | |
957 | (void *) (unsigned long) socket, | |
958 | &iter); | |
959 | node = cds_lfht_iter_get_node(&iter); | |
960 | if (!node) { | |
961 | goto end; | |
962 | } | |
963 | ||
964 | client = caa_container_of(node, struct notification_client, | |
965 | client_socket_ht_node); | |
966 | end: | |
967 | return client; | |
968 | } | |
969 | ||
970 | static | |
e8360425 JD |
971 | bool buffer_usage_condition_applies_to_channel( |
972 | struct lttng_condition *condition, | |
8abe313a | 973 | struct channel_info *channel_info) |
ab0ee2ca JG |
974 | { |
975 | enum lttng_condition_status status; | |
e8360425 JD |
976 | enum lttng_domain_type condition_domain; |
977 | const char *condition_session_name = NULL; | |
978 | const char *condition_channel_name = NULL; | |
ab0ee2ca | 979 | |
e8360425 JD |
980 | status = lttng_condition_buffer_usage_get_domain_type(condition, |
981 | &condition_domain); | |
982 | assert(status == LTTNG_CONDITION_STATUS_OK); | |
983 | if (channel_info->key.domain != condition_domain) { | |
ab0ee2ca JG |
984 | goto fail; |
985 | } | |
986 | ||
e8360425 JD |
987 | status = lttng_condition_buffer_usage_get_session_name( |
988 | condition, &condition_session_name); | |
989 | assert((status == LTTNG_CONDITION_STATUS_OK) && condition_session_name); | |
990 | ||
991 | status = lttng_condition_buffer_usage_get_channel_name( | |
992 | condition, &condition_channel_name); | |
993 | assert((status == LTTNG_CONDITION_STATUS_OK) && condition_channel_name); | |
994 | ||
995 | if (strcmp(channel_info->session_info->name, condition_session_name)) { | |
996 | goto fail; | |
997 | } | |
998 | if (strcmp(channel_info->name, condition_channel_name)) { | |
ab0ee2ca JG |
999 | goto fail; |
1000 | } | |
1001 | ||
e8360425 JD |
1002 | return true; |
1003 | fail: | |
1004 | return false; | |
1005 | } | |
1006 | ||
1007 | static | |
1008 | bool session_consumed_size_condition_applies_to_channel( | |
1009 | struct lttng_condition *condition, | |
1010 | struct channel_info *channel_info) | |
1011 | { | |
1012 | enum lttng_condition_status status; | |
1013 | const char *condition_session_name = NULL; | |
1014 | ||
1015 | status = lttng_condition_session_consumed_size_get_session_name( | |
1016 | condition, &condition_session_name); | |
1017 | assert((status == LTTNG_CONDITION_STATUS_OK) && condition_session_name); | |
1018 | ||
1019 | if (strcmp(channel_info->session_info->name, condition_session_name)) { | |
ab0ee2ca JG |
1020 | goto fail; |
1021 | } | |
1022 | ||
e8360425 JD |
1023 | return true; |
1024 | fail: | |
1025 | return false; | |
1026 | } | |
ab0ee2ca | 1027 | |
e8360425 JD |
1028 | static |
1029 | bool trigger_applies_to_channel(struct lttng_trigger *trigger, | |
1030 | struct channel_info *channel_info) | |
1031 | { | |
1032 | struct lttng_condition *condition; | |
1033 | bool trigger_applies; | |
ab0ee2ca | 1034 | |
e8360425 JD |
1035 | condition = lttng_trigger_get_condition(trigger); |
1036 | if (!condition) { | |
ab0ee2ca JG |
1037 | goto fail; |
1038 | } | |
e8360425 JD |
1039 | |
1040 | switch (lttng_condition_get_type(condition)) { | |
1041 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
1042 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
1043 | trigger_applies = buffer_usage_condition_applies_to_channel( | |
1044 | condition, channel_info); | |
1045 | break; | |
1046 | case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE: | |
1047 | trigger_applies = session_consumed_size_condition_applies_to_channel( | |
1048 | condition, channel_info); | |
1049 | break; | |
1050 | default: | |
ab0ee2ca JG |
1051 | goto fail; |
1052 | } | |
1053 | ||
e8360425 | 1054 | return trigger_applies; |
ab0ee2ca JG |
1055 | fail: |
1056 | return false; | |
1057 | } | |
1058 | ||
1059 | static | |
1060 | bool trigger_applies_to_client(struct lttng_trigger *trigger, | |
1061 | struct notification_client *client) | |
1062 | { | |
1063 | bool applies = false; | |
1064 | struct lttng_condition_list_element *condition_list_element; | |
1065 | ||
1066 | cds_list_for_each_entry(condition_list_element, &client->condition_list, | |
1067 | node) { | |
1068 | applies = lttng_condition_is_equal( | |
1069 | condition_list_element->condition, | |
1070 | lttng_trigger_get_condition(trigger)); | |
1071 | if (applies) { | |
1072 | break; | |
1073 | } | |
1074 | } | |
1075 | return applies; | |
1076 | } | |
1077 | ||
8abe313a JG |
1078 | static |
1079 | int match_session(struct cds_lfht_node *node, const void *key) | |
1080 | { | |
1081 | const char *name = key; | |
1082 | struct session_info *session_info = caa_container_of( | |
1083 | node, struct session_info, sessions_ht_node); | |
1084 | ||
1085 | return !strcmp(session_info->name, name); | |
1086 | } | |
1087 | ||
ea9a44f0 JG |
1088 | /* |
1089 | * Allocate an empty lttng_session_trigger_list for the session named | |
1090 | * 'session_name'. | |
1091 | * | |
1092 | * No ownership of 'session_name' is assumed by the session trigger list. | |
1093 | * It is the caller's responsability to ensure the session name is alive | |
1094 | * for as long as this list is. | |
1095 | */ | |
1096 | static | |
1097 | struct lttng_session_trigger_list *lttng_session_trigger_list_create( | |
1098 | const char *session_name, | |
1099 | struct cds_lfht *session_triggers_ht) | |
1100 | { | |
1101 | struct lttng_session_trigger_list *list; | |
1102 | ||
1103 | list = zmalloc(sizeof(*list)); | |
1104 | if (!list) { | |
1105 | goto end; | |
1106 | } | |
1107 | list->session_name = session_name; | |
1108 | CDS_INIT_LIST_HEAD(&list->list); | |
1109 | cds_lfht_node_init(&list->session_triggers_ht_node); | |
1110 | list->session_triggers_ht = session_triggers_ht; | |
1111 | ||
1112 | rcu_read_lock(); | |
1113 | /* Publish the list through the session_triggers_ht. */ | |
1114 | cds_lfht_add(session_triggers_ht, | |
1115 | hash_key_str(session_name, lttng_ht_seed), | |
1116 | &list->session_triggers_ht_node); | |
1117 | rcu_read_unlock(); | |
1118 | end: | |
1119 | return list; | |
1120 | } | |
1121 | ||
1122 | static | |
1123 | void free_session_trigger_list_rcu(struct rcu_head *node) | |
1124 | { | |
1125 | free(caa_container_of(node, struct lttng_session_trigger_list, | |
1126 | rcu_node)); | |
1127 | } | |
1128 | ||
1129 | static | |
1130 | void lttng_session_trigger_list_destroy(struct lttng_session_trigger_list *list) | |
1131 | { | |
1132 | struct lttng_trigger_list_element *trigger_list_element, *tmp; | |
1133 | ||
1134 | /* Empty the list element by element, and then free the list itself. */ | |
1135 | cds_list_for_each_entry_safe(trigger_list_element, tmp, | |
1136 | &list->list, node) { | |
1137 | cds_list_del(&trigger_list_element->node); | |
1138 | free(trigger_list_element); | |
1139 | } | |
1140 | rcu_read_lock(); | |
1141 | /* Unpublish the list from the session_triggers_ht. */ | |
1142 | cds_lfht_del(list->session_triggers_ht, | |
1143 | &list->session_triggers_ht_node); | |
1144 | rcu_read_unlock(); | |
1145 | call_rcu(&list->rcu_node, free_session_trigger_list_rcu); | |
1146 | } | |
1147 | ||
1148 | static | |
1149 | int lttng_session_trigger_list_add(struct lttng_session_trigger_list *list, | |
1150 | const struct lttng_trigger *trigger) | |
1151 | { | |
1152 | int ret = 0; | |
1153 | struct lttng_trigger_list_element *new_element = | |
1154 | zmalloc(sizeof(*new_element)); | |
1155 | ||
1156 | if (!new_element) { | |
1157 | ret = -1; | |
1158 | goto end; | |
1159 | } | |
1160 | CDS_INIT_LIST_HEAD(&new_element->node); | |
1161 | new_element->trigger = trigger; | |
1162 | cds_list_add(&new_element->node, &list->list); | |
1163 | end: | |
1164 | return ret; | |
1165 | } | |
1166 | ||
1167 | static | |
1168 | bool trigger_applies_to_session(const struct lttng_trigger *trigger, | |
1169 | const char *session_name) | |
1170 | { | |
1171 | bool applies = false; | |
1172 | const struct lttng_condition *condition; | |
1173 | ||
1174 | condition = lttng_trigger_get_const_condition(trigger); | |
1175 | switch (lttng_condition_get_type(condition)) { | |
1176 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING: | |
1177 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED: | |
1178 | { | |
1179 | enum lttng_condition_status condition_status; | |
1180 | const char *condition_session_name; | |
1181 | ||
1182 | condition_status = lttng_condition_session_rotation_get_session_name( | |
1183 | condition, &condition_session_name); | |
1184 | if (condition_status != LTTNG_CONDITION_STATUS_OK) { | |
1185 | ERR("[notification-thread] Failed to retrieve session rotation condition's session name"); | |
1186 | goto end; | |
1187 | } | |
1188 | ||
1189 | assert(condition_session_name); | |
1190 | applies = !strcmp(condition_session_name, session_name); | |
1191 | break; | |
1192 | } | |
1193 | default: | |
1194 | goto end; | |
1195 | } | |
1196 | end: | |
1197 | return applies; | |
1198 | } | |
1199 | ||
1200 | /* | |
1201 | * Allocate and initialize an lttng_session_trigger_list which contains | |
1202 | * all triggers that apply to the session named 'session_name'. | |
1203 | * | |
1204 | * No ownership of 'session_name' is assumed by the session trigger list. | |
1205 | * It is the caller's responsability to ensure the session name is alive | |
1206 | * for as long as this list is. | |
1207 | */ | |
1208 | static | |
1209 | struct lttng_session_trigger_list *lttng_session_trigger_list_build( | |
1210 | const struct notification_thread_state *state, | |
1211 | const char *session_name) | |
1212 | { | |
1213 | int trigger_count = 0; | |
1214 | struct lttng_session_trigger_list *session_trigger_list = NULL; | |
1215 | struct lttng_trigger_ht_element *trigger_ht_element = NULL; | |
1216 | struct cds_lfht_iter iter; | |
1217 | ||
1218 | session_trigger_list = lttng_session_trigger_list_create(session_name, | |
1219 | state->session_triggers_ht); | |
1220 | ||
1221 | /* Add all triggers applying to the session named 'session_name'. */ | |
1222 | cds_lfht_for_each_entry(state->triggers_ht, &iter, trigger_ht_element, | |
1223 | node) { | |
1224 | int ret; | |
1225 | ||
1226 | if (!trigger_applies_to_session(trigger_ht_element->trigger, | |
1227 | session_name)) { | |
1228 | continue; | |
1229 | } | |
1230 | ||
1231 | ret = lttng_session_trigger_list_add(session_trigger_list, | |
1232 | trigger_ht_element->trigger); | |
1233 | if (ret) { | |
1234 | goto error; | |
1235 | } | |
1236 | ||
1237 | trigger_count++; | |
1238 | } | |
1239 | ||
1240 | DBG("[notification-thread] Found %i triggers that apply to newly created session", | |
1241 | trigger_count); | |
1242 | return session_trigger_list; | |
1243 | error: | |
1244 | lttng_session_trigger_list_destroy(session_trigger_list); | |
1245 | return NULL; | |
1246 | } | |
1247 | ||
8abe313a JG |
1248 | static |
1249 | struct session_info *find_or_create_session_info( | |
1250 | struct notification_thread_state *state, | |
1251 | const char *name, uid_t uid, gid_t gid) | |
1252 | { | |
1253 | struct session_info *session = NULL; | |
1254 | struct cds_lfht_node *node; | |
1255 | struct cds_lfht_iter iter; | |
ea9a44f0 | 1256 | struct lttng_session_trigger_list *trigger_list; |
8abe313a JG |
1257 | |
1258 | rcu_read_lock(); | |
1259 | cds_lfht_lookup(state->sessions_ht, | |
1260 | hash_key_str(name, lttng_ht_seed), | |
1261 | match_session, | |
1262 | name, | |
1263 | &iter); | |
1264 | node = cds_lfht_iter_get_node(&iter); | |
1265 | if (node) { | |
1266 | DBG("[notification-thread] Found session info of session \"%s\" (uid = %i, gid = %i)", | |
1267 | name, uid, gid); | |
1268 | session = caa_container_of(node, struct session_info, | |
1269 | sessions_ht_node); | |
1270 | assert(session->uid == uid); | |
1271 | assert(session->gid == gid); | |
ea9a44f0 JG |
1272 | goto error; |
1273 | } | |
1274 | ||
1275 | trigger_list = lttng_session_trigger_list_build(state, name); | |
1276 | if (!trigger_list) { | |
1277 | goto error; | |
8abe313a JG |
1278 | } |
1279 | ||
ea9a44f0 | 1280 | session = session_info_create(name, uid, gid, trigger_list); |
8abe313a JG |
1281 | if (!session) { |
1282 | ERR("[notification-thread] Failed to allocation session info for session \"%s\" (uid = %i, gid = %i)", | |
1283 | name, uid, gid); | |
ea9a44f0 | 1284 | goto error; |
8abe313a | 1285 | } |
ea9a44f0 | 1286 | trigger_list = NULL; |
577983cb JG |
1287 | |
1288 | cds_lfht_add(state->sessions_ht, hash_key_str(name, lttng_ht_seed), | |
9b63a4aa | 1289 | &session->sessions_ht_node); |
8abe313a JG |
1290 | rcu_read_unlock(); |
1291 | return session; | |
ea9a44f0 JG |
1292 | error: |
1293 | rcu_read_unlock(); | |
1294 | session_info_put(session); | |
1295 | return NULL; | |
8abe313a JG |
1296 | } |
1297 | ||
ab0ee2ca JG |
1298 | static |
1299 | int handle_notification_thread_command_add_channel( | |
8abe313a JG |
1300 | struct notification_thread_state *state, |
1301 | const char *session_name, uid_t session_uid, gid_t session_gid, | |
1302 | const char *channel_name, enum lttng_domain_type channel_domain, | |
1303 | uint64_t channel_key_int, uint64_t channel_capacity, | |
1304 | enum lttng_error_code *cmd_result) | |
ab0ee2ca JG |
1305 | { |
1306 | struct cds_list_head trigger_list; | |
8abe313a JG |
1307 | struct channel_info *new_channel_info = NULL; |
1308 | struct channel_key channel_key = { | |
1309 | .key = channel_key_int, | |
1310 | .domain = channel_domain, | |
1311 | }; | |
ab0ee2ca JG |
1312 | struct lttng_channel_trigger_list *channel_trigger_list = NULL; |
1313 | struct lttng_trigger_ht_element *trigger_ht_element = NULL; | |
1314 | int trigger_count = 0; | |
1315 | struct cds_lfht_iter iter; | |
8abe313a | 1316 | struct session_info *session_info = NULL; |
ab0ee2ca JG |
1317 | |
1318 | DBG("[notification-thread] Adding channel %s from session %s, channel key = %" PRIu64 " in %s domain", | |
8abe313a JG |
1319 | channel_name, session_name, channel_key_int, |
1320 | channel_domain == LTTNG_DOMAIN_KERNEL ? "kernel" : "user space"); | |
ab0ee2ca JG |
1321 | |
1322 | CDS_INIT_LIST_HEAD(&trigger_list); | |
1323 | ||
8abe313a JG |
1324 | session_info = find_or_create_session_info(state, session_name, |
1325 | session_uid, session_gid); | |
1326 | if (!session_info) { | |
1327 | /* Allocation error or an internal error occured. */ | |
ab0ee2ca JG |
1328 | goto error; |
1329 | } | |
1330 | ||
8abe313a JG |
1331 | new_channel_info = channel_info_create(channel_name, &channel_key, |
1332 | channel_capacity, session_info); | |
1333 | if (!new_channel_info) { | |
1334 | goto error; | |
1335 | } | |
ab0ee2ca JG |
1336 | |
1337 | /* Build a list of all triggers applying to the new channel. */ | |
1338 | cds_lfht_for_each_entry(state->triggers_ht, &iter, trigger_ht_element, | |
1339 | node) { | |
1340 | struct lttng_trigger_list_element *new_element; | |
1341 | ||
1342 | if (!trigger_applies_to_channel(trigger_ht_element->trigger, | |
8abe313a | 1343 | new_channel_info)) { |
ab0ee2ca JG |
1344 | continue; |
1345 | } | |
1346 | ||
1347 | new_element = zmalloc(sizeof(*new_element)); | |
1348 | if (!new_element) { | |
1349 | goto error; | |
1350 | } | |
1351 | CDS_INIT_LIST_HEAD(&new_element->node); | |
1352 | new_element->trigger = trigger_ht_element->trigger; | |
1353 | cds_list_add(&new_element->node, &trigger_list); | |
1354 | trigger_count++; | |
1355 | } | |
1356 | ||
1357 | DBG("[notification-thread] Found %i triggers that apply to newly added channel", | |
1358 | trigger_count); | |
1359 | channel_trigger_list = zmalloc(sizeof(*channel_trigger_list)); | |
1360 | if (!channel_trigger_list) { | |
1361 | goto error; | |
1362 | } | |
8abe313a | 1363 | channel_trigger_list->channel_key = new_channel_info->key; |
ab0ee2ca JG |
1364 | CDS_INIT_LIST_HEAD(&channel_trigger_list->list); |
1365 | cds_lfht_node_init(&channel_trigger_list->channel_triggers_ht_node); | |
1366 | cds_list_splice(&trigger_list, &channel_trigger_list->list); | |
1367 | ||
1368 | rcu_read_lock(); | |
1369 | /* Add channel to the channel_ht which owns the channel_infos. */ | |
1370 | cds_lfht_add(state->channels_ht, | |
8abe313a | 1371 | hash_channel_key(&new_channel_info->key), |
ab0ee2ca JG |
1372 | &new_channel_info->channels_ht_node); |
1373 | /* | |
1374 | * Add the list of triggers associated with this channel to the | |
1375 | * channel_triggers_ht. | |
1376 | */ | |
1377 | cds_lfht_add(state->channel_triggers_ht, | |
8abe313a | 1378 | hash_channel_key(&new_channel_info->key), |
ab0ee2ca JG |
1379 | &channel_trigger_list->channel_triggers_ht_node); |
1380 | rcu_read_unlock(); | |
1381 | *cmd_result = LTTNG_OK; | |
1382 | return 0; | |
1383 | error: | |
ab0ee2ca | 1384 | channel_info_destroy(new_channel_info); |
8abe313a | 1385 | session_info_put(session_info); |
ab0ee2ca JG |
1386 | return 1; |
1387 | } | |
1388 | ||
1389 | static | |
1390 | int handle_notification_thread_command_remove_channel( | |
1391 | struct notification_thread_state *state, | |
1392 | uint64_t channel_key, enum lttng_domain_type domain, | |
1393 | enum lttng_error_code *cmd_result) | |
1394 | { | |
1395 | struct cds_lfht_node *node; | |
1396 | struct cds_lfht_iter iter; | |
1397 | struct lttng_channel_trigger_list *trigger_list; | |
1398 | struct lttng_trigger_list_element *trigger_list_element, *tmp; | |
1399 | struct channel_key key = { .key = channel_key, .domain = domain }; | |
1400 | struct channel_info *channel_info; | |
1401 | ||
1402 | DBG("[notification-thread] Removing channel key = %" PRIu64 " in %s domain", | |
1403 | channel_key, domain == LTTNG_DOMAIN_KERNEL ? "kernel" : "user space"); | |
1404 | ||
1405 | rcu_read_lock(); | |
1406 | ||
1407 | cds_lfht_lookup(state->channel_triggers_ht, | |
1408 | hash_channel_key(&key), | |
1409 | match_channel_trigger_list, | |
1410 | &key, | |
1411 | &iter); | |
1412 | node = cds_lfht_iter_get_node(&iter); | |
1413 | /* | |
1414 | * There is a severe internal error if we are being asked to remove a | |
1415 | * channel that doesn't exist. | |
1416 | */ | |
1417 | if (!node) { | |
1418 | ERR("[notification-thread] Channel being removed is unknown to the notification thread"); | |
1419 | goto end; | |
1420 | } | |
1421 | ||
1422 | /* Free the list of triggers associated with this channel. */ | |
1423 | trigger_list = caa_container_of(node, struct lttng_channel_trigger_list, | |
1424 | channel_triggers_ht_node); | |
1425 | cds_list_for_each_entry_safe(trigger_list_element, tmp, | |
1426 | &trigger_list->list, node) { | |
1427 | cds_list_del(&trigger_list_element->node); | |
1428 | free(trigger_list_element); | |
1429 | } | |
1430 | cds_lfht_del(state->channel_triggers_ht, node); | |
1431 | free(trigger_list); | |
1432 | ||
1433 | /* Free sampled channel state. */ | |
1434 | cds_lfht_lookup(state->channel_state_ht, | |
1435 | hash_channel_key(&key), | |
1436 | match_channel_state_sample, | |
1437 | &key, | |
1438 | &iter); | |
1439 | node = cds_lfht_iter_get_node(&iter); | |
1440 | /* | |
1441 | * This is expected to be NULL if the channel is destroyed before we | |
1442 | * received a sample. | |
1443 | */ | |
1444 | if (node) { | |
1445 | struct channel_state_sample *sample = caa_container_of(node, | |
1446 | struct channel_state_sample, | |
1447 | channel_state_ht_node); | |
1448 | ||
1449 | cds_lfht_del(state->channel_state_ht, node); | |
1450 | free(sample); | |
1451 | } | |
1452 | ||
1453 | /* Remove the channel from the channels_ht and free it. */ | |
1454 | cds_lfht_lookup(state->channels_ht, | |
1455 | hash_channel_key(&key), | |
1456 | match_channel_info, | |
1457 | &key, | |
1458 | &iter); | |
1459 | node = cds_lfht_iter_get_node(&iter); | |
1460 | assert(node); | |
1461 | channel_info = caa_container_of(node, struct channel_info, | |
1462 | channels_ht_node); | |
1463 | cds_lfht_del(state->channels_ht, node); | |
1464 | channel_info_destroy(channel_info); | |
1465 | end: | |
1466 | rcu_read_unlock(); | |
1467 | *cmd_result = LTTNG_OK; | |
1468 | return 0; | |
1469 | } | |
1470 | ||
1da26331 JG |
1471 | static |
1472 | int condition_is_supported(struct lttng_condition *condition) | |
1473 | { | |
1474 | int ret; | |
1475 | ||
1476 | switch (lttng_condition_get_type(condition)) { | |
1477 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
1478 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
1479 | { | |
1480 | enum lttng_domain_type domain; | |
1481 | ||
1482 | ret = lttng_condition_buffer_usage_get_domain_type(condition, | |
1483 | &domain); | |
1484 | if (ret) { | |
1485 | ret = -1; | |
1486 | goto end; | |
1487 | } | |
1488 | ||
1489 | if (domain != LTTNG_DOMAIN_KERNEL) { | |
1490 | ret = 1; | |
1491 | goto end; | |
1492 | } | |
1493 | ||
1494 | /* | |
1495 | * Older kernel tracers don't expose the API to monitor their | |
1496 | * buffers. Therefore, we reject triggers that require that | |
1497 | * mechanism to be available to be evaluated. | |
1498 | */ | |
1499 | ret = kernel_supports_ring_buffer_snapshot_sample_positions( | |
1500 | kernel_tracer_fd); | |
1501 | break; | |
1502 | } | |
1503 | default: | |
1504 | ret = 1; | |
1505 | } | |
1506 | end: | |
1507 | return ret; | |
1508 | } | |
1509 | ||
ab0ee2ca JG |
1510 | /* |
1511 | * FIXME A client's credentials are not checked when registering a trigger, nor | |
1512 | * are they stored alongside with the trigger. | |
1513 | * | |
1da26331 | 1514 | * The effects of this are benign since: |
ab0ee2ca JG |
1515 | * - The client will succeed in registering the trigger, as it is valid, |
1516 | * - The trigger will, internally, be bound to the channel, | |
1517 | * - The notifications will not be sent since the client's credentials | |
1518 | * are checked against the channel at that moment. | |
1da26331 JG |
1519 | * |
1520 | * If this function returns a non-zero value, it means something is | |
50ca7858 | 1521 | * fundamentally broken and the whole subsystem/thread will be torn down. |
1da26331 JG |
1522 | * |
1523 | * If a non-fatal error occurs, just set the cmd_result to the appropriate | |
1524 | * error code. | |
ab0ee2ca JG |
1525 | */ |
1526 | static | |
1527 | int handle_notification_thread_command_register_trigger( | |
8abe313a JG |
1528 | struct notification_thread_state *state, |
1529 | struct lttng_trigger *trigger, | |
1530 | enum lttng_error_code *cmd_result) | |
ab0ee2ca JG |
1531 | { |
1532 | int ret = 0; | |
1533 | struct lttng_condition *condition; | |
1534 | struct notification_client *client; | |
1535 | struct notification_client_list *client_list = NULL; | |
1536 | struct lttng_trigger_ht_element *trigger_ht_element = NULL; | |
1537 | struct notification_client_list_element *client_list_element, *tmp; | |
1538 | struct cds_lfht_node *node; | |
1539 | struct cds_lfht_iter iter; | |
1540 | struct channel_info *channel; | |
1541 | bool free_trigger = true; | |
1542 | ||
1543 | rcu_read_lock(); | |
1544 | ||
1545 | condition = lttng_trigger_get_condition(trigger); | |
1da26331 JG |
1546 | assert(condition); |
1547 | ||
1548 | ret = condition_is_supported(condition); | |
1549 | if (ret < 0) { | |
1550 | goto error; | |
1551 | } else if (ret == 0) { | |
1552 | *cmd_result = LTTNG_ERR_NOT_SUPPORTED; | |
1553 | goto error; | |
1554 | } else { | |
1555 | /* Feature is supported, continue. */ | |
1556 | ret = 0; | |
1557 | } | |
1558 | ||
ab0ee2ca JG |
1559 | trigger_ht_element = zmalloc(sizeof(*trigger_ht_element)); |
1560 | if (!trigger_ht_element) { | |
1561 | ret = -1; | |
1562 | goto error; | |
1563 | } | |
1564 | ||
1565 | /* Add trigger to the trigger_ht. */ | |
1566 | cds_lfht_node_init(&trigger_ht_element->node); | |
1567 | trigger_ht_element->trigger = trigger; | |
1568 | ||
1569 | node = cds_lfht_add_unique(state->triggers_ht, | |
1570 | lttng_condition_hash(condition), | |
1571 | match_condition, | |
1572 | condition, | |
1573 | &trigger_ht_element->node); | |
1574 | if (node != &trigger_ht_element->node) { | |
1575 | /* Not a fatal error, simply report it to the client. */ | |
1576 | *cmd_result = LTTNG_ERR_TRIGGER_EXISTS; | |
1577 | goto error_free_ht_element; | |
1578 | } | |
1579 | ||
1580 | /* | |
1581 | * Ownership of the trigger and of its wrapper was transfered to | |
1582 | * the triggers_ht. | |
1583 | */ | |
1584 | trigger_ht_element = NULL; | |
1585 | free_trigger = false; | |
1586 | ||
1587 | /* | |
1588 | * The rest only applies to triggers that have a "notify" action. | |
1589 | * It is not skipped as this is the only action type currently | |
1590 | * supported. | |
1591 | */ | |
1592 | client_list = zmalloc(sizeof(*client_list)); | |
1593 | if (!client_list) { | |
1594 | ret = -1; | |
1595 | goto error_free_ht_element; | |
1596 | } | |
1597 | cds_lfht_node_init(&client_list->notification_trigger_ht_node); | |
1598 | CDS_INIT_LIST_HEAD(&client_list->list); | |
1599 | client_list->trigger = trigger; | |
1600 | ||
1601 | /* Build a list of clients to which this new trigger applies. */ | |
1602 | cds_lfht_for_each_entry(state->client_socket_ht, &iter, client, | |
1603 | client_socket_ht_node) { | |
1604 | if (!trigger_applies_to_client(trigger, client)) { | |
1605 | continue; | |
1606 | } | |
1607 | ||
1608 | client_list_element = zmalloc(sizeof(*client_list_element)); | |
1609 | if (!client_list_element) { | |
1610 | ret = -1; | |
1611 | goto error_free_client_list; | |
1612 | } | |
1613 | CDS_INIT_LIST_HEAD(&client_list_element->node); | |
1614 | client_list_element->client = client; | |
1615 | cds_list_add(&client_list_element->node, &client_list->list); | |
1616 | } | |
1617 | ||
1618 | cds_lfht_add(state->notification_trigger_clients_ht, | |
1619 | lttng_condition_hash(condition), | |
1620 | &client_list->notification_trigger_ht_node); | |
ab0ee2ca JG |
1621 | |
1622 | /* | |
1623 | * Add the trigger to list of triggers bound to the channels currently | |
1624 | * known. | |
1625 | */ | |
1626 | cds_lfht_for_each_entry(state->channels_ht, &iter, channel, | |
1627 | channels_ht_node) { | |
1628 | struct lttng_trigger_list_element *trigger_list_element; | |
1629 | struct lttng_channel_trigger_list *trigger_list; | |
1630 | ||
1631 | if (!trigger_applies_to_channel(trigger, channel)) { | |
1632 | continue; | |
1633 | } | |
1634 | ||
1635 | cds_lfht_lookup(state->channel_triggers_ht, | |
1636 | hash_channel_key(&channel->key), | |
1637 | match_channel_trigger_list, | |
1638 | &channel->key, | |
1639 | &iter); | |
1640 | node = cds_lfht_iter_get_node(&iter); | |
1641 | assert(node); | |
ab0ee2ca JG |
1642 | trigger_list = caa_container_of(node, |
1643 | struct lttng_channel_trigger_list, | |
1644 | channel_triggers_ht_node); | |
1645 | ||
1646 | trigger_list_element = zmalloc(sizeof(*trigger_list_element)); | |
1647 | if (!trigger_list_element) { | |
1648 | ret = -1; | |
1649 | goto error_free_client_list; | |
1650 | } | |
1651 | CDS_INIT_LIST_HEAD(&trigger_list_element->node); | |
1652 | trigger_list_element->trigger = trigger; | |
1653 | cds_list_add(&trigger_list_element->node, &trigger_list->list); | |
ab0ee2ca JG |
1654 | } |
1655 | ||
2ae99f0b JG |
1656 | /* |
1657 | * Since there is nothing preventing clients from subscribing to a | |
1658 | * condition before the corresponding trigger is registered, we have | |
1659 | * to evaluate this new condition right away. | |
1660 | * | |
1661 | * At some point, we were waiting for the next "evaluation" (e.g. on | |
1662 | * reception of a channel sample) to evaluate this new condition, but | |
1663 | * that was broken. | |
1664 | * | |
1665 | * The reason it was broken is that waiting for the next sample | |
1666 | * does not allow us to properly handle transitions for edge-triggered | |
1667 | * conditions. | |
1668 | * | |
1669 | * Consider this example: when we handle a new channel sample, we | |
1670 | * evaluate each conditions twice: once with the previous state, and | |
1671 | * again with the newest state. We then use those two results to | |
1672 | * determine whether a state change happened: a condition was false and | |
1673 | * became true. If a state change happened, we have to notify clients. | |
1674 | * | |
1675 | * Now, if a client subscribes to a given notification and registers | |
1676 | * a trigger *after* that subscription, we have to make sure the | |
1677 | * condition is evaluated at this point while considering only the | |
1678 | * current state. Otherwise, the next evaluation cycle may only see | |
1679 | * that the evaluations remain the same (true for samples n-1 and n) and | |
1680 | * the client will never know that the condition has been met. | |
1681 | */ | |
1682 | cds_list_for_each_entry_safe(client_list_element, tmp, | |
1683 | &client_list->list, node) { | |
1684 | ret = evaluate_condition_for_client(trigger, condition, | |
1685 | client_list_element->client, state); | |
1686 | if (ret) { | |
1687 | goto error_free_client_list; | |
1688 | } | |
1689 | } | |
1690 | ||
1691 | /* | |
1692 | * Client list ownership transferred to the | |
1693 | * notification_trigger_clients_ht. | |
1694 | */ | |
1695 | client_list = NULL; | |
1696 | ||
ab0ee2ca JG |
1697 | *cmd_result = LTTNG_OK; |
1698 | error_free_client_list: | |
1699 | if (client_list) { | |
1700 | cds_list_for_each_entry_safe(client_list_element, tmp, | |
1701 | &client_list->list, node) { | |
1702 | free(client_list_element); | |
1703 | } | |
1704 | free(client_list); | |
1705 | } | |
1706 | error_free_ht_element: | |
1707 | free(trigger_ht_element); | |
1708 | error: | |
1709 | if (free_trigger) { | |
1710 | struct lttng_action *action = lttng_trigger_get_action(trigger); | |
1711 | ||
1712 | lttng_condition_destroy(condition); | |
1713 | lttng_action_destroy(action); | |
1714 | lttng_trigger_destroy(trigger); | |
1715 | } | |
1716 | rcu_read_unlock(); | |
1717 | return ret; | |
1718 | } | |
1719 | ||
cc2295b5 | 1720 | static |
ab0ee2ca JG |
1721 | int handle_notification_thread_command_unregister_trigger( |
1722 | struct notification_thread_state *state, | |
1723 | struct lttng_trigger *trigger, | |
1724 | enum lttng_error_code *_cmd_reply) | |
1725 | { | |
1726 | struct cds_lfht_iter iter; | |
1727 | struct cds_lfht_node *node, *triggers_ht_node; | |
1728 | struct lttng_channel_trigger_list *trigger_list; | |
1729 | struct notification_client_list *client_list; | |
1730 | struct notification_client_list_element *client_list_element, *tmp; | |
1731 | struct lttng_trigger_ht_element *trigger_ht_element = NULL; | |
1732 | struct lttng_condition *condition = lttng_trigger_get_condition( | |
1733 | trigger); | |
1734 | struct lttng_action *action; | |
1735 | enum lttng_error_code cmd_reply; | |
1736 | ||
1737 | rcu_read_lock(); | |
1738 | ||
1739 | cds_lfht_lookup(state->triggers_ht, | |
1740 | lttng_condition_hash(condition), | |
1741 | match_condition, | |
1742 | condition, | |
1743 | &iter); | |
1744 | triggers_ht_node = cds_lfht_iter_get_node(&iter); | |
1745 | if (!triggers_ht_node) { | |
1746 | cmd_reply = LTTNG_ERR_TRIGGER_NOT_FOUND; | |
1747 | goto end; | |
1748 | } else { | |
1749 | cmd_reply = LTTNG_OK; | |
1750 | } | |
1751 | ||
1752 | /* Remove trigger from channel_triggers_ht. */ | |
1753 | cds_lfht_for_each_entry(state->channel_triggers_ht, &iter, trigger_list, | |
1754 | channel_triggers_ht_node) { | |
1755 | struct lttng_trigger_list_element *trigger_element, *tmp; | |
1756 | ||
1757 | cds_list_for_each_entry_safe(trigger_element, tmp, | |
1758 | &trigger_list->list, node) { | |
9b63a4aa JG |
1759 | const struct lttng_condition *current_condition = |
1760 | lttng_trigger_get_const_condition( | |
ab0ee2ca JG |
1761 | trigger_element->trigger); |
1762 | ||
1763 | assert(current_condition); | |
1764 | if (!lttng_condition_is_equal(condition, | |
1765 | current_condition)) { | |
1766 | continue; | |
1767 | } | |
1768 | ||
1769 | DBG("[notification-thread] Removed trigger from channel_triggers_ht"); | |
1770 | cds_list_del(&trigger_element->node); | |
e4db5ace JR |
1771 | /* A trigger can only appear once per channel */ |
1772 | break; | |
ab0ee2ca JG |
1773 | } |
1774 | } | |
1775 | ||
1776 | /* | |
1777 | * Remove and release the client list from | |
1778 | * notification_trigger_clients_ht. | |
1779 | */ | |
1780 | cds_lfht_lookup(state->notification_trigger_clients_ht, | |
1781 | lttng_condition_hash(condition), | |
1782 | match_client_list, | |
1783 | trigger, | |
1784 | &iter); | |
1785 | node = cds_lfht_iter_get_node(&iter); | |
1786 | assert(node); | |
1787 | client_list = caa_container_of(node, struct notification_client_list, | |
1788 | notification_trigger_ht_node); | |
1789 | cds_list_for_each_entry_safe(client_list_element, tmp, | |
1790 | &client_list->list, node) { | |
1791 | free(client_list_element); | |
1792 | } | |
1793 | cds_lfht_del(state->notification_trigger_clients_ht, node); | |
1794 | free(client_list); | |
1795 | ||
1796 | /* Remove trigger from triggers_ht. */ | |
1797 | trigger_ht_element = caa_container_of(triggers_ht_node, | |
1798 | struct lttng_trigger_ht_element, node); | |
1799 | cds_lfht_del(state->triggers_ht, triggers_ht_node); | |
1800 | ||
1801 | condition = lttng_trigger_get_condition(trigger_ht_element->trigger); | |
1802 | lttng_condition_destroy(condition); | |
1803 | action = lttng_trigger_get_action(trigger_ht_element->trigger); | |
1804 | lttng_action_destroy(action); | |
1805 | lttng_trigger_destroy(trigger_ht_element->trigger); | |
1806 | free(trigger_ht_element); | |
1807 | end: | |
1808 | rcu_read_unlock(); | |
1809 | if (_cmd_reply) { | |
1810 | *_cmd_reply = cmd_reply; | |
1811 | } | |
1812 | return 0; | |
1813 | } | |
1814 | ||
1815 | /* Returns 0 on success, 1 on exit requested, negative value on error. */ | |
1816 | int handle_notification_thread_command( | |
1817 | struct notification_thread_handle *handle, | |
1818 | struct notification_thread_state *state) | |
1819 | { | |
1820 | int ret; | |
1821 | uint64_t counter; | |
1822 | struct notification_thread_command *cmd; | |
1823 | ||
8abe313a JG |
1824 | /* Read the event pipe to put it back into a quiescent state. */ |
1825 | ret = read(lttng_pipe_get_readfd(handle->cmd_queue.event_pipe), &counter, | |
1826 | sizeof(counter)); | |
ab0ee2ca JG |
1827 | if (ret == -1) { |
1828 | goto error; | |
1829 | } | |
1830 | ||
1831 | pthread_mutex_lock(&handle->cmd_queue.lock); | |
1832 | cmd = cds_list_first_entry(&handle->cmd_queue.list, | |
1833 | struct notification_thread_command, cmd_list_node); | |
1834 | switch (cmd->type) { | |
1835 | case NOTIFICATION_COMMAND_TYPE_REGISTER_TRIGGER: | |
1836 | DBG("[notification-thread] Received register trigger command"); | |
1837 | ret = handle_notification_thread_command_register_trigger( | |
1838 | state, cmd->parameters.trigger, | |
1839 | &cmd->reply_code); | |
1840 | break; | |
1841 | case NOTIFICATION_COMMAND_TYPE_UNREGISTER_TRIGGER: | |
1842 | DBG("[notification-thread] Received unregister trigger command"); | |
1843 | ret = handle_notification_thread_command_unregister_trigger( | |
1844 | state, cmd->parameters.trigger, | |
1845 | &cmd->reply_code); | |
1846 | break; | |
1847 | case NOTIFICATION_COMMAND_TYPE_ADD_CHANNEL: | |
1848 | DBG("[notification-thread] Received add channel command"); | |
1849 | ret = handle_notification_thread_command_add_channel( | |
8abe313a JG |
1850 | state, |
1851 | cmd->parameters.add_channel.session.name, | |
1852 | cmd->parameters.add_channel.session.uid, | |
1853 | cmd->parameters.add_channel.session.gid, | |
1854 | cmd->parameters.add_channel.channel.name, | |
1855 | cmd->parameters.add_channel.channel.domain, | |
1856 | cmd->parameters.add_channel.channel.key, | |
1857 | cmd->parameters.add_channel.channel.capacity, | |
ab0ee2ca JG |
1858 | &cmd->reply_code); |
1859 | break; | |
1860 | case NOTIFICATION_COMMAND_TYPE_REMOVE_CHANNEL: | |
1861 | DBG("[notification-thread] Received remove channel command"); | |
1862 | ret = handle_notification_thread_command_remove_channel( | |
1863 | state, cmd->parameters.remove_channel.key, | |
1864 | cmd->parameters.remove_channel.domain, | |
1865 | &cmd->reply_code); | |
1866 | break; | |
1867 | case NOTIFICATION_COMMAND_TYPE_QUIT: | |
1868 | DBG("[notification-thread] Received quit command"); | |
1869 | cmd->reply_code = LTTNG_OK; | |
1870 | ret = 1; | |
1871 | goto end; | |
1872 | default: | |
1873 | ERR("[notification-thread] Unknown internal command received"); | |
1874 | goto error_unlock; | |
1875 | } | |
1876 | ||
1877 | if (ret) { | |
1878 | goto error_unlock; | |
1879 | } | |
1880 | end: | |
1881 | cds_list_del(&cmd->cmd_list_node); | |
8ada111f | 1882 | lttng_waiter_wake_up(&cmd->reply_waiter); |
ab0ee2ca JG |
1883 | pthread_mutex_unlock(&handle->cmd_queue.lock); |
1884 | return ret; | |
1885 | error_unlock: | |
1886 | /* Wake-up and return a fatal error to the calling thread. */ | |
8ada111f | 1887 | lttng_waiter_wake_up(&cmd->reply_waiter); |
ab0ee2ca JG |
1888 | pthread_mutex_unlock(&handle->cmd_queue.lock); |
1889 | cmd->reply_code = LTTNG_ERR_FATAL; | |
1890 | error: | |
1891 | /* Indicate a fatal error to the caller. */ | |
1892 | return -1; | |
1893 | } | |
1894 | ||
1895 | static | |
1896 | unsigned long hash_client_socket(int socket) | |
1897 | { | |
1898 | return hash_key_ulong((void *) (unsigned long) socket, lttng_ht_seed); | |
1899 | } | |
1900 | ||
1901 | static | |
1902 | int socket_set_non_blocking(int socket) | |
1903 | { | |
1904 | int ret, flags; | |
1905 | ||
1906 | /* Set the pipe as non-blocking. */ | |
1907 | ret = fcntl(socket, F_GETFL, 0); | |
1908 | if (ret == -1) { | |
1909 | PERROR("fcntl get socket flags"); | |
1910 | goto end; | |
1911 | } | |
1912 | flags = ret; | |
1913 | ||
1914 | ret = fcntl(socket, F_SETFL, flags | O_NONBLOCK); | |
1915 | if (ret == -1) { | |
1916 | PERROR("fcntl set O_NONBLOCK socket flag"); | |
1917 | goto end; | |
1918 | } | |
1919 | DBG("Client socket (fd = %i) set as non-blocking", socket); | |
1920 | end: | |
1921 | return ret; | |
1922 | } | |
1923 | ||
1924 | static | |
14fa22f8 | 1925 | int client_reset_inbound_state(struct notification_client *client) |
ab0ee2ca JG |
1926 | { |
1927 | int ret; | |
1928 | ||
1929 | ret = lttng_dynamic_buffer_set_size( | |
1930 | &client->communication.inbound.buffer, 0); | |
1931 | assert(!ret); | |
1932 | ||
1933 | client->communication.inbound.bytes_to_receive = | |
1934 | sizeof(struct lttng_notification_channel_message); | |
1935 | client->communication.inbound.msg_type = | |
1936 | LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_UNKNOWN; | |
ab0ee2ca JG |
1937 | LTTNG_SOCK_SET_UID_CRED(&client->communication.inbound.creds, -1); |
1938 | LTTNG_SOCK_SET_GID_CRED(&client->communication.inbound.creds, -1); | |
14fa22f8 JG |
1939 | ret = lttng_dynamic_buffer_set_size( |
1940 | &client->communication.inbound.buffer, | |
1941 | client->communication.inbound.bytes_to_receive); | |
1942 | return ret; | |
ab0ee2ca JG |
1943 | } |
1944 | ||
1945 | int handle_notification_thread_client_connect( | |
1946 | struct notification_thread_state *state) | |
1947 | { | |
1948 | int ret; | |
1949 | struct notification_client *client; | |
1950 | ||
1951 | DBG("[notification-thread] Handling new notification channel client connection"); | |
1952 | ||
1953 | client = zmalloc(sizeof(*client)); | |
1954 | if (!client) { | |
1955 | /* Fatal error. */ | |
1956 | ret = -1; | |
1957 | goto error; | |
1958 | } | |
1959 | CDS_INIT_LIST_HEAD(&client->condition_list); | |
1960 | lttng_dynamic_buffer_init(&client->communication.inbound.buffer); | |
1961 | lttng_dynamic_buffer_init(&client->communication.outbound.buffer); | |
01ea340e | 1962 | client->communication.inbound.expect_creds = true; |
14fa22f8 JG |
1963 | ret = client_reset_inbound_state(client); |
1964 | if (ret) { | |
1965 | ERR("[notification-thread] Failed to reset client communication's inbound state"); | |
1966 | ret = 0; | |
1967 | goto error; | |
1968 | } | |
ab0ee2ca JG |
1969 | |
1970 | ret = lttcomm_accept_unix_sock(state->notification_channel_socket); | |
1971 | if (ret < 0) { | |
1972 | ERR("[notification-thread] Failed to accept new notification channel client connection"); | |
1973 | ret = 0; | |
1974 | goto error; | |
1975 | } | |
1976 | ||
1977 | client->socket = ret; | |
1978 | ||
1979 | ret = socket_set_non_blocking(client->socket); | |
1980 | if (ret) { | |
1981 | ERR("[notification-thread] Failed to set new notification channel client connection socket as non-blocking"); | |
1982 | goto error; | |
1983 | } | |
1984 | ||
1985 | ret = lttcomm_setsockopt_creds_unix_sock(client->socket); | |
1986 | if (ret < 0) { | |
1987 | ERR("[notification-thread] Failed to set socket options on new notification channel client socket"); | |
1988 | ret = 0; | |
1989 | goto error; | |
1990 | } | |
1991 | ||
1992 | ret = lttng_poll_add(&state->events, client->socket, | |
1993 | LPOLLIN | LPOLLERR | | |
1994 | LPOLLHUP | LPOLLRDHUP); | |
1995 | if (ret < 0) { | |
1996 | ERR("[notification-thread] Failed to add notification channel client socket to poll set"); | |
1997 | ret = 0; | |
1998 | goto error; | |
1999 | } | |
2000 | DBG("[notification-thread] Added new notification channel client socket (%i) to poll set", | |
2001 | client->socket); | |
2002 | ||
ab0ee2ca JG |
2003 | rcu_read_lock(); |
2004 | cds_lfht_add(state->client_socket_ht, | |
2005 | hash_client_socket(client->socket), | |
2006 | &client->client_socket_ht_node); | |
2007 | rcu_read_unlock(); | |
2008 | ||
2009 | return ret; | |
2010 | error: | |
2011 | notification_client_destroy(client, state); | |
2012 | return ret; | |
2013 | } | |
2014 | ||
2015 | int handle_notification_thread_client_disconnect( | |
2016 | int client_socket, | |
2017 | struct notification_thread_state *state) | |
2018 | { | |
2019 | int ret = 0; | |
2020 | struct notification_client *client; | |
2021 | ||
2022 | rcu_read_lock(); | |
2023 | DBG("[notification-thread] Closing client connection (socket fd = %i)", | |
2024 | client_socket); | |
2025 | client = get_client_from_socket(client_socket, state); | |
2026 | if (!client) { | |
2027 | /* Internal state corruption, fatal error. */ | |
2028 | ERR("[notification-thread] Unable to find client (socket fd = %i)", | |
2029 | client_socket); | |
2030 | ret = -1; | |
2031 | goto end; | |
2032 | } | |
2033 | ||
2034 | ret = lttng_poll_del(&state->events, client_socket); | |
2035 | if (ret) { | |
2036 | ERR("[notification-thread] Failed to remove client socket from poll set"); | |
2037 | } | |
2038 | cds_lfht_del(state->client_socket_ht, | |
2039 | &client->client_socket_ht_node); | |
2040 | notification_client_destroy(client, state); | |
2041 | end: | |
2042 | rcu_read_unlock(); | |
2043 | return ret; | |
2044 | } | |
2045 | ||
2046 | int handle_notification_thread_client_disconnect_all( | |
2047 | struct notification_thread_state *state) | |
2048 | { | |
2049 | struct cds_lfht_iter iter; | |
2050 | struct notification_client *client; | |
2051 | bool error_encoutered = false; | |
2052 | ||
2053 | rcu_read_lock(); | |
2054 | DBG("[notification-thread] Closing all client connections"); | |
2055 | cds_lfht_for_each_entry(state->client_socket_ht, &iter, client, | |
2056 | client_socket_ht_node) { | |
2057 | int ret; | |
2058 | ||
2059 | ret = handle_notification_thread_client_disconnect( | |
2060 | client->socket, state); | |
2061 | if (ret) { | |
2062 | error_encoutered = true; | |
2063 | } | |
2064 | } | |
2065 | rcu_read_unlock(); | |
2066 | return error_encoutered ? 1 : 0; | |
2067 | } | |
2068 | ||
2069 | int handle_notification_thread_trigger_unregister_all( | |
2070 | struct notification_thread_state *state) | |
2071 | { | |
4149ace8 | 2072 | bool error_occurred = false; |
ab0ee2ca JG |
2073 | struct cds_lfht_iter iter; |
2074 | struct lttng_trigger_ht_element *trigger_ht_element; | |
2075 | ||
2076 | cds_lfht_for_each_entry(state->triggers_ht, &iter, trigger_ht_element, | |
2077 | node) { | |
2078 | int ret = handle_notification_thread_command_unregister_trigger( | |
2079 | state, trigger_ht_element->trigger, NULL); | |
2080 | if (ret) { | |
4149ace8 | 2081 | error_occurred = true; |
ab0ee2ca JG |
2082 | } |
2083 | } | |
4149ace8 | 2084 | return error_occurred ? -1 : 0; |
ab0ee2ca JG |
2085 | } |
2086 | ||
2087 | static | |
2088 | int client_flush_outgoing_queue(struct notification_client *client, | |
2089 | struct notification_thread_state *state) | |
2090 | { | |
2091 | ssize_t ret; | |
2092 | size_t to_send_count; | |
2093 | ||
2094 | assert(client->communication.outbound.buffer.size != 0); | |
2095 | to_send_count = client->communication.outbound.buffer.size; | |
2096 | DBG("[notification-thread] Flushing client (socket fd = %i) outgoing queue", | |
2097 | client->socket); | |
2098 | ||
2099 | ret = lttcomm_send_unix_sock_non_block(client->socket, | |
2100 | client->communication.outbound.buffer.data, | |
2101 | to_send_count); | |
2102 | if ((ret < 0 && (errno == EAGAIN || errno == EWOULDBLOCK)) || | |
2103 | (ret > 0 && ret < to_send_count)) { | |
2104 | DBG("[notification-thread] Client (socket fd = %i) outgoing queue could not be completely flushed", | |
2105 | client->socket); | |
2106 | to_send_count -= max(ret, 0); | |
2107 | ||
2108 | memcpy(client->communication.outbound.buffer.data, | |
2109 | client->communication.outbound.buffer.data + | |
2110 | client->communication.outbound.buffer.size - to_send_count, | |
2111 | to_send_count); | |
2112 | ret = lttng_dynamic_buffer_set_size( | |
2113 | &client->communication.outbound.buffer, | |
2114 | to_send_count); | |
2115 | if (ret) { | |
2116 | goto error; | |
2117 | } | |
2118 | ||
2119 | /* | |
2120 | * We want to be notified whenever there is buffer space | |
2121 | * available to send the rest of the payload. | |
2122 | */ | |
2123 | ret = lttng_poll_mod(&state->events, client->socket, | |
2124 | CLIENT_POLL_MASK_IN_OUT); | |
2125 | if (ret) { | |
2126 | goto error; | |
2127 | } | |
2128 | } else if (ret < 0) { | |
2129 | /* Generic error, disconnect the client. */ | |
2130 | ERR("[notification-thread] Failed to send flush outgoing queue, disconnecting client (socket fd = %i)", | |
2131 | client->socket); | |
2132 | ret = handle_notification_thread_client_disconnect( | |
2133 | client->socket, state); | |
2134 | if (ret) { | |
2135 | goto error; | |
2136 | } | |
2137 | } else { | |
2138 | /* No error and flushed the queue completely. */ | |
2139 | ret = lttng_dynamic_buffer_set_size( | |
2140 | &client->communication.outbound.buffer, 0); | |
2141 | if (ret) { | |
2142 | goto error; | |
2143 | } | |
2144 | ret = lttng_poll_mod(&state->events, client->socket, | |
2145 | CLIENT_POLL_MASK_IN); | |
2146 | if (ret) { | |
2147 | goto error; | |
2148 | } | |
2149 | ||
2150 | client->communication.outbound.queued_command_reply = false; | |
2151 | client->communication.outbound.dropped_notification = false; | |
2152 | } | |
2153 | ||
2154 | return 0; | |
2155 | error: | |
2156 | return -1; | |
2157 | } | |
2158 | ||
2159 | static | |
2160 | int client_send_command_reply(struct notification_client *client, | |
2161 | struct notification_thread_state *state, | |
2162 | enum lttng_notification_channel_status status) | |
2163 | { | |
2164 | int ret; | |
2165 | struct lttng_notification_channel_command_reply reply = { | |
2166 | .status = (int8_t) status, | |
2167 | }; | |
2168 | struct lttng_notification_channel_message msg = { | |
2169 | .type = (int8_t) LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_COMMAND_REPLY, | |
2170 | .size = sizeof(reply), | |
2171 | }; | |
2172 | char buffer[sizeof(msg) + sizeof(reply)]; | |
2173 | ||
2174 | if (client->communication.outbound.queued_command_reply) { | |
2175 | /* Protocol error. */ | |
2176 | goto error; | |
2177 | } | |
2178 | ||
2179 | memcpy(buffer, &msg, sizeof(msg)); | |
2180 | memcpy(buffer + sizeof(msg), &reply, sizeof(reply)); | |
2181 | DBG("[notification-thread] Send command reply (%i)", (int) status); | |
2182 | ||
2183 | /* Enqueue buffer to outgoing queue and flush it. */ | |
2184 | ret = lttng_dynamic_buffer_append( | |
2185 | &client->communication.outbound.buffer, | |
2186 | buffer, sizeof(buffer)); | |
2187 | if (ret) { | |
2188 | goto error; | |
2189 | } | |
2190 | ||
2191 | ret = client_flush_outgoing_queue(client, state); | |
2192 | if (ret) { | |
2193 | goto error; | |
2194 | } | |
2195 | ||
2196 | if (client->communication.outbound.buffer.size != 0) { | |
2197 | /* Queue could not be emptied. */ | |
2198 | client->communication.outbound.queued_command_reply = true; | |
2199 | } | |
2200 | ||
2201 | return 0; | |
2202 | error: | |
2203 | return -1; | |
2204 | } | |
2205 | ||
2206 | static | |
2207 | int client_dispatch_message(struct notification_client *client, | |
2208 | struct notification_thread_state *state) | |
2209 | { | |
2210 | int ret = 0; | |
2211 | ||
2212 | if (client->communication.inbound.msg_type != | |
2213 | LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_HANDSHAKE && | |
2214 | client->communication.inbound.msg_type != | |
2215 | LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_UNKNOWN && | |
2216 | !client->validated) { | |
2217 | WARN("[notification-thread] client attempted a command before handshake"); | |
2218 | ret = -1; | |
2219 | goto end; | |
2220 | } | |
2221 | ||
2222 | switch (client->communication.inbound.msg_type) { | |
2223 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_UNKNOWN: | |
2224 | { | |
2225 | /* | |
2226 | * Receiving message header. The function will be called again | |
2227 | * once the rest of the message as been received and can be | |
2228 | * interpreted. | |
2229 | */ | |
2230 | const struct lttng_notification_channel_message *msg; | |
2231 | ||
2232 | assert(sizeof(*msg) == | |
2233 | client->communication.inbound.buffer.size); | |
2234 | msg = (const struct lttng_notification_channel_message *) | |
2235 | client->communication.inbound.buffer.data; | |
2236 | ||
2237 | if (msg->size == 0 || msg->size > DEFAULT_MAX_NOTIFICATION_CLIENT_MESSAGE_PAYLOAD_SIZE) { | |
2238 | ERR("[notification-thread] Invalid notification channel message: length = %u", msg->size); | |
2239 | ret = -1; | |
2240 | goto end; | |
2241 | } | |
2242 | ||
2243 | switch (msg->type) { | |
2244 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_SUBSCRIBE: | |
2245 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_UNSUBSCRIBE: | |
2246 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_HANDSHAKE: | |
2247 | break; | |
2248 | default: | |
2249 | ret = -1; | |
2250 | ERR("[notification-thread] Invalid notification channel message: unexpected message type"); | |
2251 | goto end; | |
2252 | } | |
2253 | ||
2254 | client->communication.inbound.bytes_to_receive = msg->size; | |
2255 | client->communication.inbound.msg_type = | |
2256 | (enum lttng_notification_channel_message_type) msg->type; | |
ab0ee2ca | 2257 | ret = lttng_dynamic_buffer_set_size( |
14fa22f8 | 2258 | &client->communication.inbound.buffer, msg->size); |
ab0ee2ca JG |
2259 | if (ret) { |
2260 | goto end; | |
2261 | } | |
2262 | break; | |
2263 | } | |
2264 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_HANDSHAKE: | |
2265 | { | |
2266 | struct lttng_notification_channel_command_handshake *handshake_client; | |
2267 | struct lttng_notification_channel_command_handshake handshake_reply = { | |
2268 | .major = LTTNG_NOTIFICATION_CHANNEL_VERSION_MAJOR, | |
2269 | .minor = LTTNG_NOTIFICATION_CHANNEL_VERSION_MINOR, | |
2270 | }; | |
2271 | struct lttng_notification_channel_message msg_header = { | |
2272 | .type = LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_HANDSHAKE, | |
2273 | .size = sizeof(handshake_reply), | |
2274 | }; | |
2275 | enum lttng_notification_channel_status status = | |
2276 | LTTNG_NOTIFICATION_CHANNEL_STATUS_OK; | |
2277 | char send_buffer[sizeof(msg_header) + sizeof(handshake_reply)]; | |
2278 | ||
2279 | memcpy(send_buffer, &msg_header, sizeof(msg_header)); | |
2280 | memcpy(send_buffer + sizeof(msg_header), &handshake_reply, | |
2281 | sizeof(handshake_reply)); | |
2282 | ||
2283 | handshake_client = | |
2284 | (struct lttng_notification_channel_command_handshake *) | |
2285 | client->communication.inbound.buffer.data; | |
47a32869 | 2286 | client->major = handshake_client->major; |
ab0ee2ca JG |
2287 | client->minor = handshake_client->minor; |
2288 | if (!client->communication.inbound.creds_received) { | |
2289 | ERR("[notification-thread] No credentials received from client"); | |
2290 | ret = -1; | |
2291 | goto end; | |
2292 | } | |
2293 | ||
2294 | client->uid = LTTNG_SOCK_GET_UID_CRED( | |
2295 | &client->communication.inbound.creds); | |
2296 | client->gid = LTTNG_SOCK_GET_GID_CRED( | |
2297 | &client->communication.inbound.creds); | |
2298 | DBG("[notification-thread] Received handshake from client (uid = %u, gid = %u) with version %i.%i", | |
2299 | client->uid, client->gid, (int) client->major, | |
2300 | (int) client->minor); | |
2301 | ||
2302 | if (handshake_client->major != LTTNG_NOTIFICATION_CHANNEL_VERSION_MAJOR) { | |
2303 | status = LTTNG_NOTIFICATION_CHANNEL_STATUS_UNSUPPORTED_VERSION; | |
2304 | } | |
2305 | ||
2306 | ret = lttng_dynamic_buffer_append(&client->communication.outbound.buffer, | |
2307 | send_buffer, sizeof(send_buffer)); | |
2308 | if (ret) { | |
2309 | ERR("[notification-thread] Failed to send protocol version to notification channel client"); | |
2310 | goto end; | |
2311 | } | |
2312 | ||
2313 | ret = client_flush_outgoing_queue(client, state); | |
2314 | if (ret) { | |
2315 | goto end; | |
2316 | } | |
2317 | ||
2318 | ret = client_send_command_reply(client, state, status); | |
2319 | if (ret) { | |
2320 | ERR("[notification-thread] Failed to send reply to notification channel client"); | |
2321 | goto end; | |
2322 | } | |
2323 | ||
2324 | /* Set reception state to receive the next message header. */ | |
14fa22f8 JG |
2325 | ret = client_reset_inbound_state(client); |
2326 | if (ret) { | |
2327 | ERR("[notification-thread] Failed to reset client communication's inbound state"); | |
2328 | goto end; | |
2329 | } | |
ab0ee2ca JG |
2330 | client->validated = true; |
2331 | break; | |
2332 | } | |
2333 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_SUBSCRIBE: | |
2334 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_UNSUBSCRIBE: | |
2335 | { | |
2336 | struct lttng_condition *condition; | |
2337 | enum lttng_notification_channel_status status = | |
2338 | LTTNG_NOTIFICATION_CHANNEL_STATUS_OK; | |
2339 | const struct lttng_buffer_view condition_view = | |
2340 | lttng_buffer_view_from_dynamic_buffer( | |
2341 | &client->communication.inbound.buffer, | |
2342 | 0, -1); | |
2343 | size_t expected_condition_size = | |
2344 | client->communication.inbound.buffer.size; | |
2345 | ||
2346 | ret = lttng_condition_create_from_buffer(&condition_view, | |
2347 | &condition); | |
2348 | if (ret != expected_condition_size) { | |
2349 | ERR("[notification-thread] Malformed condition received from client"); | |
2350 | goto end; | |
2351 | } | |
2352 | ||
2353 | if (client->communication.inbound.msg_type == | |
2354 | LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_SUBSCRIBE) { | |
ab0ee2ca JG |
2355 | ret = notification_thread_client_subscribe(client, |
2356 | condition, state, &status); | |
2357 | } else { | |
2358 | ret = notification_thread_client_unsubscribe(client, | |
2359 | condition, state, &status); | |
2360 | } | |
2361 | if (ret) { | |
2362 | goto end; | |
2363 | } | |
2364 | ||
2365 | ret = client_send_command_reply(client, state, status); | |
2366 | if (ret) { | |
2367 | ERR("[notification-thread] Failed to send reply to notification channel client"); | |
2368 | goto end; | |
2369 | } | |
2370 | ||
2371 | /* Set reception state to receive the next message header. */ | |
14fa22f8 JG |
2372 | ret = client_reset_inbound_state(client); |
2373 | if (ret) { | |
2374 | ERR("[notification-thread] Failed to reset client communication's inbound state"); | |
2375 | goto end; | |
2376 | } | |
ab0ee2ca JG |
2377 | break; |
2378 | } | |
2379 | default: | |
2380 | abort(); | |
2381 | } | |
2382 | end: | |
2383 | return ret; | |
2384 | } | |
2385 | ||
2386 | /* Incoming data from client. */ | |
2387 | int handle_notification_thread_client_in( | |
2388 | struct notification_thread_state *state, int socket) | |
2389 | { | |
14fa22f8 | 2390 | int ret = 0; |
ab0ee2ca JG |
2391 | struct notification_client *client; |
2392 | ssize_t recv_ret; | |
2393 | size_t offset; | |
2394 | ||
2395 | client = get_client_from_socket(socket, state); | |
2396 | if (!client) { | |
2397 | /* Internal error, abort. */ | |
2398 | ret = -1; | |
2399 | goto end; | |
2400 | } | |
2401 | ||
14fa22f8 JG |
2402 | offset = client->communication.inbound.buffer.size - |
2403 | client->communication.inbound.bytes_to_receive; | |
01ea340e | 2404 | if (client->communication.inbound.expect_creds) { |
ab0ee2ca JG |
2405 | recv_ret = lttcomm_recv_creds_unix_sock(socket, |
2406 | client->communication.inbound.buffer.data + offset, | |
2407 | client->communication.inbound.bytes_to_receive, | |
2408 | &client->communication.inbound.creds); | |
2409 | if (recv_ret > 0) { | |
01ea340e | 2410 | client->communication.inbound.expect_creds = false; |
ab0ee2ca JG |
2411 | client->communication.inbound.creds_received = true; |
2412 | } | |
2413 | } else { | |
2414 | recv_ret = lttcomm_recv_unix_sock_non_block(socket, | |
2415 | client->communication.inbound.buffer.data + offset, | |
2416 | client->communication.inbound.bytes_to_receive); | |
2417 | } | |
2418 | if (recv_ret < 0) { | |
2419 | goto error_disconnect_client; | |
2420 | } | |
2421 | ||
2422 | client->communication.inbound.bytes_to_receive -= recv_ret; | |
ab0ee2ca JG |
2423 | if (client->communication.inbound.bytes_to_receive == 0) { |
2424 | ret = client_dispatch_message(client, state); | |
2425 | if (ret) { | |
2426 | /* | |
2427 | * Only returns an error if this client must be | |
2428 | * disconnected. | |
2429 | */ | |
2430 | goto error_disconnect_client; | |
2431 | } | |
2432 | } else { | |
2433 | goto end; | |
2434 | } | |
2435 | end: | |
2436 | return ret; | |
2437 | error_disconnect_client: | |
2438 | ret = handle_notification_thread_client_disconnect(socket, state); | |
2439 | return ret; | |
2440 | } | |
2441 | ||
2442 | /* Client ready to receive outgoing data. */ | |
2443 | int handle_notification_thread_client_out( | |
2444 | struct notification_thread_state *state, int socket) | |
2445 | { | |
2446 | int ret; | |
2447 | struct notification_client *client; | |
2448 | ||
2449 | client = get_client_from_socket(socket, state); | |
2450 | if (!client) { | |
2451 | /* Internal error, abort. */ | |
2452 | ret = -1; | |
2453 | goto end; | |
2454 | } | |
2455 | ||
2456 | ret = client_flush_outgoing_queue(client, state); | |
2457 | if (ret) { | |
2458 | goto end; | |
2459 | } | |
2460 | end: | |
2461 | return ret; | |
2462 | } | |
2463 | ||
2464 | static | |
e8360425 JD |
2465 | bool evaluate_buffer_usage_condition(const struct lttng_condition *condition, |
2466 | const struct channel_state_sample *sample, | |
2467 | uint64_t buffer_capacity) | |
ab0ee2ca JG |
2468 | { |
2469 | bool result = false; | |
2470 | uint64_t threshold; | |
2471 | enum lttng_condition_type condition_type; | |
e8360425 | 2472 | const struct lttng_condition_buffer_usage *use_condition = container_of( |
ab0ee2ca JG |
2473 | condition, struct lttng_condition_buffer_usage, |
2474 | parent); | |
2475 | ||
ab0ee2ca JG |
2476 | if (use_condition->threshold_bytes.set) { |
2477 | threshold = use_condition->threshold_bytes.value; | |
2478 | } else { | |
2479 | /* | |
2480 | * Threshold was expressed as a ratio. | |
2481 | * | |
2482 | * TODO the threshold (in bytes) of conditions expressed | |
2483 | * as a ratio of total buffer size could be cached to | |
2484 | * forego this double-multiplication or it could be performed | |
2485 | * as fixed-point math. | |
2486 | * | |
2487 | * Note that caching should accomodate the case where the | |
2488 | * condition applies to multiple channels (i.e. don't assume | |
2489 | * that all channels matching my_chann* have the same size...) | |
2490 | */ | |
2491 | threshold = (uint64_t) (use_condition->threshold_ratio.value * | |
2492 | (double) buffer_capacity); | |
2493 | } | |
2494 | ||
2495 | condition_type = lttng_condition_get_type(condition); | |
2496 | if (condition_type == LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW) { | |
2497 | DBG("[notification-thread] Low buffer usage condition being evaluated: threshold = %" PRIu64 ", highest usage = %" PRIu64, | |
2498 | threshold, sample->highest_usage); | |
2499 | ||
2500 | /* | |
2501 | * The low condition should only be triggered once _all_ of the | |
2502 | * streams in a channel have gone below the "low" threshold. | |
2503 | */ | |
2504 | if (sample->highest_usage <= threshold) { | |
2505 | result = true; | |
2506 | } | |
2507 | } else { | |
2508 | DBG("[notification-thread] High buffer usage condition being evaluated: threshold = %" PRIu64 ", highest usage = %" PRIu64, | |
2509 | threshold, sample->highest_usage); | |
2510 | ||
2511 | /* | |
2512 | * For high buffer usage scenarios, we want to trigger whenever | |
2513 | * _any_ of the streams has reached the "high" threshold. | |
2514 | */ | |
2515 | if (sample->highest_usage >= threshold) { | |
2516 | result = true; | |
2517 | } | |
2518 | } | |
e8360425 | 2519 | |
ab0ee2ca JG |
2520 | return result; |
2521 | } | |
2522 | ||
2523 | static | |
e8360425 JD |
2524 | bool evaluate_session_consumed_size_condition( |
2525 | const struct lttng_condition *condition, | |
2526 | uint64_t session_consumed_size) | |
2527 | { | |
2528 | uint64_t threshold; | |
2529 | const struct lttng_condition_session_consumed_size *size_condition = | |
2530 | container_of(condition, | |
2531 | struct lttng_condition_session_consumed_size, | |
2532 | parent); | |
2533 | ||
2534 | threshold = size_condition->consumed_threshold_bytes.value; | |
2535 | DBG("[notification-thread] Session consumed size condition being evaluated: threshold = %" PRIu64 ", current size = %" PRIu64, | |
2536 | threshold, session_consumed_size); | |
2537 | return session_consumed_size >= threshold; | |
2538 | } | |
2539 | ||
2540 | static | |
2541 | int evaluate_condition(const struct lttng_condition *condition, | |
ab0ee2ca | 2542 | struct lttng_evaluation **evaluation, |
e8360425 JD |
2543 | const struct notification_thread_state *state, |
2544 | const struct channel_state_sample *previous_sample, | |
2545 | const struct channel_state_sample *latest_sample, | |
2546 | uint64_t previous_session_consumed_total, | |
2547 | uint64_t latest_session_consumed_total, | |
2548 | struct channel_info *channel_info) | |
ab0ee2ca JG |
2549 | { |
2550 | int ret = 0; | |
2551 | enum lttng_condition_type condition_type; | |
e8360425 JD |
2552 | const bool previous_sample_available = !!previous_sample; |
2553 | bool previous_sample_result = false; | |
ab0ee2ca JG |
2554 | bool latest_sample_result; |
2555 | ||
2556 | condition_type = lttng_condition_get_type(condition); | |
ab0ee2ca | 2557 | |
e8360425 JD |
2558 | switch (condition_type) { |
2559 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
2560 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
2561 | if (caa_likely(previous_sample_available)) { | |
2562 | previous_sample_result = | |
2563 | evaluate_buffer_usage_condition(condition, | |
2564 | previous_sample, channel_info->capacity); | |
2565 | } | |
2566 | latest_sample_result = evaluate_buffer_usage_condition( | |
2567 | condition, latest_sample, | |
2568 | channel_info->capacity); | |
2569 | break; | |
2570 | case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE: | |
2571 | if (caa_likely(previous_sample_available)) { | |
2572 | previous_sample_result = | |
2573 | evaluate_session_consumed_size_condition( | |
2574 | condition, | |
2575 | previous_session_consumed_total); | |
2576 | } | |
2577 | latest_sample_result = | |
2578 | evaluate_session_consumed_size_condition( | |
2579 | condition, | |
2580 | latest_session_consumed_total); | |
2581 | break; | |
2582 | default: | |
2583 | /* Unknown condition type; internal error. */ | |
2584 | abort(); | |
2585 | } | |
ab0ee2ca JG |
2586 | |
2587 | if (!latest_sample_result || | |
2588 | (previous_sample_result == latest_sample_result)) { | |
2589 | /* | |
2590 | * Only trigger on a condition evaluation transition. | |
2591 | * | |
2592 | * NOTE: This edge-triggered logic may not be appropriate for | |
2593 | * future condition types. | |
2594 | */ | |
2595 | goto end; | |
2596 | } | |
2597 | ||
e8360425 JD |
2598 | if (!evaluation || !latest_sample_result) { |
2599 | goto end; | |
2600 | } | |
2601 | ||
2602 | switch (condition_type) { | |
2603 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
2604 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
ab0ee2ca JG |
2605 | *evaluation = lttng_evaluation_buffer_usage_create( |
2606 | condition_type, | |
2607 | latest_sample->highest_usage, | |
e8360425 JD |
2608 | channel_info->capacity); |
2609 | break; | |
2610 | case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE: | |
2611 | *evaluation = lttng_evaluation_session_consumed_size_create( | |
e8360425 JD |
2612 | latest_session_consumed_total); |
2613 | break; | |
2614 | default: | |
2615 | abort(); | |
2616 | } | |
2617 | ||
2618 | if (!*evaluation) { | |
2619 | ret = -1; | |
2620 | goto end; | |
ab0ee2ca JG |
2621 | } |
2622 | end: | |
2623 | return ret; | |
2624 | } | |
2625 | ||
2626 | static | |
2627 | int client_enqueue_dropped_notification(struct notification_client *client, | |
2628 | struct notification_thread_state *state) | |
2629 | { | |
2630 | int ret; | |
2631 | struct lttng_notification_channel_message msg = { | |
2632 | .type = (int8_t) LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_NOTIFICATION_DROPPED, | |
2633 | .size = 0, | |
2634 | }; | |
2635 | ||
2636 | ret = lttng_dynamic_buffer_append( | |
2637 | &client->communication.outbound.buffer, &msg, | |
2638 | sizeof(msg)); | |
2639 | return ret; | |
2640 | } | |
2641 | ||
2642 | static | |
9b63a4aa JG |
2643 | int send_evaluation_to_clients(const struct lttng_trigger *trigger, |
2644 | const struct lttng_evaluation *evaluation, | |
ab0ee2ca JG |
2645 | struct notification_client_list* client_list, |
2646 | struct notification_thread_state *state, | |
2647 | uid_t channel_uid, gid_t channel_gid) | |
2648 | { | |
2649 | int ret = 0; | |
2650 | struct lttng_dynamic_buffer msg_buffer; | |
2651 | struct notification_client_list_element *client_list_element, *tmp; | |
9b63a4aa JG |
2652 | const struct lttng_notification notification = { |
2653 | .condition = (struct lttng_condition *) lttng_trigger_get_const_condition(trigger), | |
2654 | .evaluation = (struct lttng_evaluation *) evaluation, | |
2655 | }; | |
3647288f JG |
2656 | struct lttng_notification_channel_message msg_header = { |
2657 | .type = (int8_t) LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_NOTIFICATION, | |
2658 | }; | |
ab0ee2ca JG |
2659 | |
2660 | lttng_dynamic_buffer_init(&msg_buffer); | |
2661 | ||
3647288f JG |
2662 | ret = lttng_dynamic_buffer_append(&msg_buffer, &msg_header, |
2663 | sizeof(msg_header)); | |
ab0ee2ca JG |
2664 | if (ret) { |
2665 | goto end; | |
2666 | } | |
2667 | ||
9b63a4aa | 2668 | ret = lttng_notification_serialize(¬ification, &msg_buffer); |
ab0ee2ca | 2669 | if (ret) { |
ab0ee2ca JG |
2670 | ERR("[notification-thread] Failed to serialize notification"); |
2671 | ret = -1; | |
2672 | goto end; | |
2673 | } | |
2674 | ||
3647288f JG |
2675 | /* Update payload size. */ |
2676 | ((struct lttng_notification_channel_message * ) msg_buffer.data)->size = | |
2677 | (uint32_t) (msg_buffer.size - sizeof(msg_header)); | |
2678 | ||
ab0ee2ca JG |
2679 | cds_list_for_each_entry_safe(client_list_element, tmp, |
2680 | &client_list->list, node) { | |
2681 | struct notification_client *client = | |
2682 | client_list_element->client; | |
2683 | ||
2684 | if (client->uid != channel_uid && client->gid != channel_gid && | |
2685 | client->uid != 0) { | |
2686 | /* Client is not allowed to monitor this channel. */ | |
2687 | DBG("[notification-thread] Skipping client at it does not have the permission to receive notification for this channel"); | |
2688 | continue; | |
2689 | } | |
2690 | ||
2691 | DBG("[notification-thread] Sending notification to client (fd = %i, %zu bytes)", | |
2692 | client->socket, msg_buffer.size); | |
2693 | if (client->communication.outbound.buffer.size) { | |
2694 | /* | |
2695 | * Outgoing data is already buffered for this client; | |
2696 | * drop the notification and enqueue a "dropped | |
2697 | * notification" message if this is the first dropped | |
2698 | * notification since the socket spilled-over to the | |
2699 | * queue. | |
2700 | */ | |
2701 | DBG("[notification-thread] Dropping notification addressed to client (socket fd = %i)", | |
2702 | client->socket); | |
2703 | if (!client->communication.outbound.dropped_notification) { | |
2704 | client->communication.outbound.dropped_notification = true; | |
2705 | ret = client_enqueue_dropped_notification( | |
2706 | client, state); | |
2707 | if (ret) { | |
2708 | goto end; | |
2709 | } | |
2710 | } | |
2711 | continue; | |
2712 | } | |
2713 | ||
2714 | ret = lttng_dynamic_buffer_append_buffer( | |
2715 | &client->communication.outbound.buffer, | |
2716 | &msg_buffer); | |
2717 | if (ret) { | |
2718 | goto end; | |
2719 | } | |
2720 | ||
2721 | ret = client_flush_outgoing_queue(client, state); | |
2722 | if (ret) { | |
2723 | goto end; | |
2724 | } | |
2725 | } | |
2726 | ret = 0; | |
2727 | end: | |
ab0ee2ca JG |
2728 | lttng_dynamic_buffer_reset(&msg_buffer); |
2729 | return ret; | |
2730 | } | |
2731 | ||
2732 | int handle_notification_thread_channel_sample( | |
2733 | struct notification_thread_state *state, int pipe, | |
2734 | enum lttng_domain_type domain) | |
2735 | { | |
2736 | int ret = 0; | |
2737 | struct lttcomm_consumer_channel_monitor_msg sample_msg; | |
ab0ee2ca JG |
2738 | struct channel_info *channel_info; |
2739 | struct cds_lfht_node *node; | |
2740 | struct cds_lfht_iter iter; | |
2741 | struct lttng_channel_trigger_list *trigger_list; | |
2742 | struct lttng_trigger_list_element *trigger_list_element; | |
2743 | bool previous_sample_available = false; | |
e8360425 JD |
2744 | struct channel_state_sample previous_sample, latest_sample; |
2745 | uint64_t previous_session_consumed_total, latest_session_consumed_total; | |
ab0ee2ca JG |
2746 | |
2747 | /* | |
2748 | * The monitoring pipe only holds messages smaller than PIPE_BUF, | |
2749 | * ensuring that read/write of sampling messages are atomic. | |
2750 | */ | |
7c2551ef | 2751 | ret = lttng_read(pipe, &sample_msg, sizeof(sample_msg)); |
ab0ee2ca JG |
2752 | if (ret != sizeof(sample_msg)) { |
2753 | ERR("[notification-thread] Failed to read from monitoring pipe (fd = %i)", | |
2754 | pipe); | |
2755 | ret = -1; | |
2756 | goto end; | |
2757 | } | |
2758 | ||
2759 | ret = 0; | |
2760 | latest_sample.key.key = sample_msg.key; | |
2761 | latest_sample.key.domain = domain; | |
2762 | latest_sample.highest_usage = sample_msg.highest; | |
2763 | latest_sample.lowest_usage = sample_msg.lowest; | |
e8360425 | 2764 | latest_sample.channel_total_consumed = sample_msg.total_consumed; |
ab0ee2ca JG |
2765 | |
2766 | rcu_read_lock(); | |
2767 | ||
2768 | /* Retrieve the channel's informations */ | |
2769 | cds_lfht_lookup(state->channels_ht, | |
2770 | hash_channel_key(&latest_sample.key), | |
2771 | match_channel_info, | |
2772 | &latest_sample.key, | |
2773 | &iter); | |
2774 | node = cds_lfht_iter_get_node(&iter); | |
e0b5f87b | 2775 | if (caa_unlikely(!node)) { |
ab0ee2ca JG |
2776 | /* |
2777 | * Not an error since the consumer can push a sample to the pipe | |
2778 | * and the rest of the session daemon could notify us of the | |
2779 | * channel's destruction before we get a chance to process that | |
2780 | * sample. | |
2781 | */ | |
2782 | DBG("[notification-thread] Received a sample for an unknown channel from consumerd, key = %" PRIu64 " in %s domain", | |
2783 | latest_sample.key.key, | |
2784 | domain == LTTNG_DOMAIN_KERNEL ? "kernel" : | |
2785 | "user space"); | |
2786 | goto end_unlock; | |
2787 | } | |
2788 | channel_info = caa_container_of(node, struct channel_info, | |
2789 | channels_ht_node); | |
e8360425 | 2790 | DBG("[notification-thread] Handling channel sample for channel %s (key = %" PRIu64 ") in session %s (highest usage = %" PRIu64 ", lowest usage = %" PRIu64", total consumed = %" PRIu64")", |
8abe313a | 2791 | channel_info->name, |
ab0ee2ca | 2792 | latest_sample.key.key, |
8abe313a | 2793 | channel_info->session_info->name, |
ab0ee2ca | 2794 | latest_sample.highest_usage, |
e8360425 JD |
2795 | latest_sample.lowest_usage, |
2796 | latest_sample.channel_total_consumed); | |
2797 | ||
2798 | previous_session_consumed_total = | |
2799 | channel_info->session_info->consumed_data_size; | |
ab0ee2ca JG |
2800 | |
2801 | /* Retrieve the channel's last sample, if it exists, and update it. */ | |
2802 | cds_lfht_lookup(state->channel_state_ht, | |
2803 | hash_channel_key(&latest_sample.key), | |
2804 | match_channel_state_sample, | |
2805 | &latest_sample.key, | |
2806 | &iter); | |
2807 | node = cds_lfht_iter_get_node(&iter); | |
e0b5f87b | 2808 | if (caa_likely(node)) { |
ab0ee2ca JG |
2809 | struct channel_state_sample *stored_sample; |
2810 | ||
2811 | /* Update the sample stored. */ | |
2812 | stored_sample = caa_container_of(node, | |
2813 | struct channel_state_sample, | |
2814 | channel_state_ht_node); | |
e8360425 | 2815 | |
ab0ee2ca JG |
2816 | memcpy(&previous_sample, stored_sample, |
2817 | sizeof(previous_sample)); | |
2818 | stored_sample->highest_usage = latest_sample.highest_usage; | |
2819 | stored_sample->lowest_usage = latest_sample.lowest_usage; | |
0f0479d7 | 2820 | stored_sample->channel_total_consumed = latest_sample.channel_total_consumed; |
ab0ee2ca | 2821 | previous_sample_available = true; |
e8360425 JD |
2822 | |
2823 | latest_session_consumed_total = | |
2824 | previous_session_consumed_total + | |
2825 | (latest_sample.channel_total_consumed - previous_sample.channel_total_consumed); | |
ab0ee2ca JG |
2826 | } else { |
2827 | /* | |
2828 | * This is the channel's first sample, allocate space for and | |
2829 | * store the new sample. | |
2830 | */ | |
2831 | struct channel_state_sample *stored_sample; | |
2832 | ||
2833 | stored_sample = zmalloc(sizeof(*stored_sample)); | |
2834 | if (!stored_sample) { | |
2835 | ret = -1; | |
2836 | goto end_unlock; | |
2837 | } | |
2838 | ||
2839 | memcpy(stored_sample, &latest_sample, sizeof(*stored_sample)); | |
2840 | cds_lfht_node_init(&stored_sample->channel_state_ht_node); | |
2841 | cds_lfht_add(state->channel_state_ht, | |
2842 | hash_channel_key(&stored_sample->key), | |
2843 | &stored_sample->channel_state_ht_node); | |
e8360425 JD |
2844 | |
2845 | latest_session_consumed_total = | |
2846 | previous_session_consumed_total + | |
2847 | latest_sample.channel_total_consumed; | |
ab0ee2ca JG |
2848 | } |
2849 | ||
e8360425 JD |
2850 | channel_info->session_info->consumed_data_size = |
2851 | latest_session_consumed_total; | |
2852 | ||
ab0ee2ca JG |
2853 | /* Find triggers associated with this channel. */ |
2854 | cds_lfht_lookup(state->channel_triggers_ht, | |
2855 | hash_channel_key(&latest_sample.key), | |
2856 | match_channel_trigger_list, | |
2857 | &latest_sample.key, | |
2858 | &iter); | |
2859 | node = cds_lfht_iter_get_node(&iter); | |
e0b5f87b | 2860 | if (caa_likely(!node)) { |
ab0ee2ca JG |
2861 | goto end_unlock; |
2862 | } | |
2863 | ||
2864 | trigger_list = caa_container_of(node, struct lttng_channel_trigger_list, | |
2865 | channel_triggers_ht_node); | |
2866 | cds_list_for_each_entry(trigger_list_element, &trigger_list->list, | |
2867 | node) { | |
9b63a4aa JG |
2868 | const struct lttng_condition *condition; |
2869 | const struct lttng_action *action; | |
2870 | const struct lttng_trigger *trigger; | |
ab0ee2ca JG |
2871 | struct notification_client_list *client_list; |
2872 | struct lttng_evaluation *evaluation = NULL; | |
2873 | ||
2874 | trigger = trigger_list_element->trigger; | |
9b63a4aa | 2875 | condition = lttng_trigger_get_const_condition(trigger); |
ab0ee2ca | 2876 | assert(condition); |
9b63a4aa | 2877 | action = lttng_trigger_get_const_action(trigger); |
ab0ee2ca JG |
2878 | |
2879 | /* Notify actions are the only type currently supported. */ | |
9b63a4aa | 2880 | assert(lttng_action_get_type_const(action) == |
ab0ee2ca JG |
2881 | LTTNG_ACTION_TYPE_NOTIFY); |
2882 | ||
2883 | /* | |
2884 | * Check if any client is subscribed to the result of this | |
2885 | * evaluation. | |
2886 | */ | |
2887 | cds_lfht_lookup(state->notification_trigger_clients_ht, | |
2888 | lttng_condition_hash(condition), | |
2889 | match_client_list, | |
2890 | trigger, | |
2891 | &iter); | |
2892 | node = cds_lfht_iter_get_node(&iter); | |
2893 | assert(node); | |
2894 | ||
2895 | client_list = caa_container_of(node, | |
2896 | struct notification_client_list, | |
2897 | notification_trigger_ht_node); | |
2898 | if (cds_list_empty(&client_list->list)) { | |
2899 | /* | |
2900 | * No clients interested in the evaluation's result, | |
2901 | * skip it. | |
2902 | */ | |
2903 | continue; | |
2904 | } | |
2905 | ||
2906 | ret = evaluate_condition(condition, &evaluation, state, | |
2907 | previous_sample_available ? &previous_sample : NULL, | |
e8360425 JD |
2908 | &latest_sample, |
2909 | previous_session_consumed_total, | |
2910 | latest_session_consumed_total, | |
2911 | channel_info); | |
2912 | if (caa_unlikely(ret)) { | |
ab0ee2ca JG |
2913 | goto end_unlock; |
2914 | } | |
2915 | ||
e8360425 | 2916 | if (caa_likely(!evaluation)) { |
ab0ee2ca JG |
2917 | continue; |
2918 | } | |
2919 | ||
2920 | /* Dispatch evaluation result to all clients. */ | |
2921 | ret = send_evaluation_to_clients(trigger_list_element->trigger, | |
2922 | evaluation, client_list, state, | |
8abe313a JG |
2923 | channel_info->session_info->uid, |
2924 | channel_info->session_info->gid); | |
2925 | lttng_evaluation_destroy(evaluation); | |
e0b5f87b | 2926 | if (caa_unlikely(ret)) { |
ab0ee2ca JG |
2927 | goto end_unlock; |
2928 | } | |
2929 | } | |
2930 | end_unlock: | |
2931 | rcu_read_unlock(); | |
2932 | end: | |
2933 | return ret; | |
2934 | } |