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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 | ||
51eab943 JG |
54 | enum lttng_object_type { |
55 | LTTNG_OBJECT_TYPE_UNKNOWN, | |
56 | LTTNG_OBJECT_TYPE_NONE, | |
57 | LTTNG_OBJECT_TYPE_CHANNEL, | |
58 | LTTNG_OBJECT_TYPE_SESSION, | |
59 | }; | |
60 | ||
ab0ee2ca | 61 | struct lttng_trigger_list_element { |
9e0bb80e JG |
62 | /* No ownership of the trigger object is assumed. */ |
63 | const struct lttng_trigger *trigger; | |
ab0ee2ca JG |
64 | struct cds_list_head node; |
65 | }; | |
66 | ||
67 | struct lttng_channel_trigger_list { | |
68 | struct channel_key channel_key; | |
ea9a44f0 | 69 | /* List of struct lttng_trigger_list_element. */ |
ab0ee2ca | 70 | struct cds_list_head list; |
ea9a44f0 | 71 | /* Node in the channel_triggers_ht */ |
ab0ee2ca JG |
72 | struct cds_lfht_node channel_triggers_ht_node; |
73 | }; | |
74 | ||
ea9a44f0 JG |
75 | /* |
76 | * List of triggers applying to a given session. | |
77 | * | |
78 | * See: | |
79 | * - lttng_session_trigger_list_create() | |
80 | * - lttng_session_trigger_list_build() | |
81 | * - lttng_session_trigger_list_destroy() | |
82 | * - lttng_session_trigger_list_add() | |
83 | */ | |
84 | struct lttng_session_trigger_list { | |
85 | /* | |
86 | * Not owned by this; points to the session_info structure's | |
87 | * session name. | |
88 | */ | |
89 | const char *session_name; | |
90 | /* List of struct lttng_trigger_list_element. */ | |
91 | struct cds_list_head list; | |
92 | /* Node in the session_triggers_ht */ | |
93 | struct cds_lfht_node session_triggers_ht_node; | |
94 | /* | |
95 | * Weak reference to the notification system's session triggers | |
96 | * hashtable. | |
97 | * | |
98 | * The session trigger list structure structure is owned by | |
99 | * the session's session_info. | |
100 | * | |
101 | * The session_info is kept alive the the channel_infos holding a | |
102 | * reference to it (reference counting). When those channels are | |
103 | * destroyed (at runtime or on teardown), the reference they hold | |
104 | * to the session_info are released. On destruction of session_info, | |
105 | * session_info_destroy() will remove the list of triggers applying | |
106 | * to this session from the notification system's state. | |
107 | * | |
108 | * This implies that the session_triggers_ht must be destroyed | |
109 | * after the channels. | |
110 | */ | |
111 | struct cds_lfht *session_triggers_ht; | |
112 | /* Used for delayed RCU reclaim. */ | |
113 | struct rcu_head rcu_node; | |
114 | }; | |
115 | ||
ab0ee2ca JG |
116 | struct lttng_trigger_ht_element { |
117 | struct lttng_trigger *trigger; | |
118 | struct cds_lfht_node node; | |
119 | }; | |
120 | ||
121 | struct lttng_condition_list_element { | |
122 | struct lttng_condition *condition; | |
123 | struct cds_list_head node; | |
124 | }; | |
125 | ||
126 | struct notification_client_list_element { | |
127 | struct notification_client *client; | |
128 | struct cds_list_head node; | |
129 | }; | |
130 | ||
131 | struct notification_client_list { | |
132 | struct lttng_trigger *trigger; | |
133 | struct cds_list_head list; | |
134 | struct cds_lfht_node notification_trigger_ht_node; | |
135 | }; | |
136 | ||
137 | struct notification_client { | |
138 | int socket; | |
139 | /* Client protocol version. */ | |
140 | uint8_t major, minor; | |
141 | uid_t uid; | |
142 | gid_t gid; | |
143 | /* | |
5332364f | 144 | * Indicates if the credentials and versions of the client have been |
ab0ee2ca JG |
145 | * checked. |
146 | */ | |
147 | bool validated; | |
148 | /* | |
149 | * Conditions to which the client's notification channel is subscribed. | |
150 | * List of struct lttng_condition_list_node. The condition member is | |
151 | * owned by the client. | |
152 | */ | |
153 | struct cds_list_head condition_list; | |
154 | struct cds_lfht_node client_socket_ht_node; | |
155 | struct { | |
156 | struct { | |
14fa22f8 JG |
157 | /* |
158 | * During the reception of a message, the reception | |
159 | * buffers' "size" is set to contain the current | |
160 | * message's complete payload. | |
161 | */ | |
ab0ee2ca JG |
162 | struct lttng_dynamic_buffer buffer; |
163 | /* Bytes left to receive for the current message. */ | |
164 | size_t bytes_to_receive; | |
165 | /* Type of the message being received. */ | |
166 | enum lttng_notification_channel_message_type msg_type; | |
167 | /* | |
168 | * Indicates whether or not credentials are expected | |
169 | * from the client. | |
170 | */ | |
01ea340e | 171 | bool expect_creds; |
ab0ee2ca JG |
172 | /* |
173 | * Indicates whether or not credentials were received | |
174 | * from the client. | |
175 | */ | |
176 | bool creds_received; | |
14fa22f8 | 177 | /* Only used during credentials reception. */ |
ab0ee2ca JG |
178 | lttng_sock_cred creds; |
179 | } inbound; | |
180 | struct { | |
181 | /* | |
182 | * Indicates whether or not a notification addressed to | |
183 | * this client was dropped because a command reply was | |
184 | * already buffered. | |
185 | * | |
186 | * A notification is dropped whenever the buffer is not | |
187 | * empty. | |
188 | */ | |
189 | bool dropped_notification; | |
190 | /* | |
191 | * Indicates whether or not a command reply is already | |
192 | * buffered. In this case, it means that the client is | |
193 | * not consuming command replies before emitting a new | |
194 | * one. This could be caused by a protocol error or a | |
195 | * misbehaving/malicious client. | |
196 | */ | |
197 | bool queued_command_reply; | |
198 | struct lttng_dynamic_buffer buffer; | |
199 | } outbound; | |
200 | } communication; | |
201 | }; | |
202 | ||
203 | struct channel_state_sample { | |
204 | struct channel_key key; | |
205 | struct cds_lfht_node channel_state_ht_node; | |
206 | uint64_t highest_usage; | |
207 | uint64_t lowest_usage; | |
e8360425 | 208 | uint64_t channel_total_consumed; |
ab0ee2ca JG |
209 | }; |
210 | ||
e4db5ace | 211 | static unsigned long hash_channel_key(struct channel_key *key); |
e8360425 | 212 | static int evaluate_condition(const struct lttng_condition *condition, |
e4db5ace | 213 | struct lttng_evaluation **evaluation, |
e8360425 JD |
214 | const struct notification_thread_state *state, |
215 | const struct channel_state_sample *previous_sample, | |
216 | const struct channel_state_sample *latest_sample, | |
217 | uint64_t previous_session_consumed_total, | |
218 | uint64_t latest_session_consumed_total, | |
219 | struct channel_info *channel_info); | |
e4db5ace | 220 | static |
9b63a4aa JG |
221 | int send_evaluation_to_clients(const struct lttng_trigger *trigger, |
222 | const struct lttng_evaluation *evaluation, | |
e4db5ace JR |
223 | struct notification_client_list *client_list, |
224 | struct notification_thread_state *state, | |
225 | uid_t channel_uid, gid_t channel_gid); | |
226 | ||
8abe313a | 227 | |
ea9a44f0 | 228 | /* session_info API */ |
8abe313a JG |
229 | static |
230 | void session_info_destroy(void *_data); | |
231 | static | |
232 | void session_info_get(struct session_info *session_info); | |
233 | static | |
234 | void session_info_put(struct session_info *session_info); | |
235 | static | |
236 | struct session_info *session_info_create(const char *name, | |
ea9a44f0 | 237 | uid_t uid, gid_t gid, |
1eee26c5 JG |
238 | struct lttng_session_trigger_list *trigger_list, |
239 | struct cds_lfht *sessions_ht); | |
8abe313a JG |
240 | static |
241 | void session_info_add_channel(struct session_info *session_info, | |
242 | struct channel_info *channel_info); | |
243 | static | |
244 | void session_info_remove_channel(struct session_info *session_info, | |
245 | struct channel_info *channel_info); | |
246 | ||
ea9a44f0 JG |
247 | /* lttng_session_trigger_list API */ |
248 | static | |
249 | struct lttng_session_trigger_list *lttng_session_trigger_list_create( | |
250 | const char *session_name, | |
251 | struct cds_lfht *session_triggers_ht); | |
252 | static | |
253 | struct lttng_session_trigger_list *lttng_session_trigger_list_build( | |
254 | const struct notification_thread_state *state, | |
255 | const char *session_name); | |
256 | static | |
257 | void lttng_session_trigger_list_destroy( | |
258 | struct lttng_session_trigger_list *list); | |
259 | static | |
260 | int lttng_session_trigger_list_add(struct lttng_session_trigger_list *list, | |
261 | const struct lttng_trigger *trigger); | |
262 | ||
263 | ||
ab0ee2ca JG |
264 | static |
265 | int match_client(struct cds_lfht_node *node, const void *key) | |
266 | { | |
267 | /* This double-cast is intended to supress pointer-to-cast warning. */ | |
268 | int socket = (int) (intptr_t) key; | |
269 | struct notification_client *client; | |
270 | ||
271 | client = caa_container_of(node, struct notification_client, | |
272 | client_socket_ht_node); | |
273 | ||
274 | return !!(client->socket == socket); | |
275 | } | |
276 | ||
277 | static | |
278 | int match_channel_trigger_list(struct cds_lfht_node *node, const void *key) | |
279 | { | |
280 | struct channel_key *channel_key = (struct channel_key *) key; | |
281 | struct lttng_channel_trigger_list *trigger_list; | |
282 | ||
283 | trigger_list = caa_container_of(node, struct lttng_channel_trigger_list, | |
284 | channel_triggers_ht_node); | |
285 | ||
286 | return !!((channel_key->key == trigger_list->channel_key.key) && | |
287 | (channel_key->domain == trigger_list->channel_key.domain)); | |
288 | } | |
289 | ||
51eab943 JG |
290 | static |
291 | int match_session_trigger_list(struct cds_lfht_node *node, const void *key) | |
292 | { | |
293 | const char *session_name = (const char *) key; | |
294 | struct lttng_session_trigger_list *trigger_list; | |
295 | ||
296 | trigger_list = caa_container_of(node, struct lttng_session_trigger_list, | |
297 | session_triggers_ht_node); | |
298 | ||
299 | return !!(strcmp(trigger_list->session_name, session_name) == 0); | |
300 | } | |
301 | ||
ab0ee2ca JG |
302 | static |
303 | int match_channel_state_sample(struct cds_lfht_node *node, const void *key) | |
304 | { | |
305 | struct channel_key *channel_key = (struct channel_key *) key; | |
306 | struct channel_state_sample *sample; | |
307 | ||
308 | sample = caa_container_of(node, struct channel_state_sample, | |
309 | channel_state_ht_node); | |
310 | ||
311 | return !!((channel_key->key == sample->key.key) && | |
312 | (channel_key->domain == sample->key.domain)); | |
313 | } | |
314 | ||
315 | static | |
316 | int match_channel_info(struct cds_lfht_node *node, const void *key) | |
317 | { | |
318 | struct channel_key *channel_key = (struct channel_key *) key; | |
319 | struct channel_info *channel_info; | |
320 | ||
321 | channel_info = caa_container_of(node, struct channel_info, | |
322 | channels_ht_node); | |
323 | ||
324 | return !!((channel_key->key == channel_info->key.key) && | |
325 | (channel_key->domain == channel_info->key.domain)); | |
326 | } | |
327 | ||
328 | static | |
329 | int match_condition(struct cds_lfht_node *node, const void *key) | |
330 | { | |
331 | struct lttng_condition *condition_key = (struct lttng_condition *) key; | |
332 | struct lttng_trigger_ht_element *trigger; | |
333 | struct lttng_condition *condition; | |
334 | ||
335 | trigger = caa_container_of(node, struct lttng_trigger_ht_element, | |
336 | node); | |
337 | condition = lttng_trigger_get_condition(trigger->trigger); | |
338 | assert(condition); | |
339 | ||
340 | return !!lttng_condition_is_equal(condition_key, condition); | |
341 | } | |
342 | ||
343 | static | |
344 | int match_client_list(struct cds_lfht_node *node, const void *key) | |
345 | { | |
346 | struct lttng_trigger *trigger_key = (struct lttng_trigger *) key; | |
347 | struct notification_client_list *client_list; | |
348 | struct lttng_condition *condition; | |
349 | struct lttng_condition *condition_key = lttng_trigger_get_condition( | |
350 | trigger_key); | |
351 | ||
352 | assert(condition_key); | |
353 | ||
354 | client_list = caa_container_of(node, struct notification_client_list, | |
355 | notification_trigger_ht_node); | |
356 | condition = lttng_trigger_get_condition(client_list->trigger); | |
357 | ||
358 | return !!lttng_condition_is_equal(condition_key, condition); | |
359 | } | |
360 | ||
361 | static | |
362 | int match_client_list_condition(struct cds_lfht_node *node, const void *key) | |
363 | { | |
364 | struct lttng_condition *condition_key = (struct lttng_condition *) key; | |
365 | struct notification_client_list *client_list; | |
366 | struct lttng_condition *condition; | |
367 | ||
368 | assert(condition_key); | |
369 | ||
370 | client_list = caa_container_of(node, struct notification_client_list, | |
371 | notification_trigger_ht_node); | |
372 | condition = lttng_trigger_get_condition(client_list->trigger); | |
373 | ||
374 | return !!lttng_condition_is_equal(condition_key, condition); | |
375 | } | |
376 | ||
377 | static | |
378 | unsigned long lttng_condition_buffer_usage_hash( | |
9b63a4aa | 379 | const struct lttng_condition *_condition) |
ab0ee2ca | 380 | { |
9a2746aa JG |
381 | unsigned long hash; |
382 | unsigned long condition_type; | |
ab0ee2ca JG |
383 | struct lttng_condition_buffer_usage *condition; |
384 | ||
385 | condition = container_of(_condition, | |
386 | struct lttng_condition_buffer_usage, parent); | |
387 | ||
9a2746aa JG |
388 | condition_type = (unsigned long) condition->parent.type; |
389 | hash = hash_key_ulong((void *) condition_type, lttng_ht_seed); | |
ab0ee2ca JG |
390 | if (condition->session_name) { |
391 | hash ^= hash_key_str(condition->session_name, lttng_ht_seed); | |
392 | } | |
393 | if (condition->channel_name) { | |
8f56701f | 394 | hash ^= hash_key_str(condition->channel_name, lttng_ht_seed); |
ab0ee2ca JG |
395 | } |
396 | if (condition->domain.set) { | |
397 | hash ^= hash_key_ulong( | |
398 | (void *) condition->domain.type, | |
399 | lttng_ht_seed); | |
400 | } | |
401 | if (condition->threshold_ratio.set) { | |
402 | uint64_t val; | |
403 | ||
404 | val = condition->threshold_ratio.value * (double) UINT32_MAX; | |
405 | hash ^= hash_key_u64(&val, lttng_ht_seed); | |
6633b0dd | 406 | } else if (condition->threshold_bytes.set) { |
ab0ee2ca JG |
407 | uint64_t val; |
408 | ||
409 | val = condition->threshold_bytes.value; | |
410 | hash ^= hash_key_u64(&val, lttng_ht_seed); | |
411 | } | |
412 | return hash; | |
413 | } | |
414 | ||
e8360425 JD |
415 | static |
416 | unsigned long lttng_condition_session_consumed_size_hash( | |
9b63a4aa | 417 | const struct lttng_condition *_condition) |
e8360425 | 418 | { |
9a2746aa JG |
419 | unsigned long hash; |
420 | unsigned long condition_type = | |
421 | (unsigned long) LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE; | |
e8360425 JD |
422 | struct lttng_condition_session_consumed_size *condition; |
423 | uint64_t val; | |
424 | ||
425 | condition = container_of(_condition, | |
426 | struct lttng_condition_session_consumed_size, parent); | |
427 | ||
9a2746aa | 428 | hash = hash_key_ulong((void *) condition_type, lttng_ht_seed); |
e8360425 JD |
429 | if (condition->session_name) { |
430 | hash ^= hash_key_str(condition->session_name, lttng_ht_seed); | |
431 | } | |
432 | val = condition->consumed_threshold_bytes.value; | |
433 | hash ^= hash_key_u64(&val, lttng_ht_seed); | |
434 | return hash; | |
435 | } | |
436 | ||
a8393880 JG |
437 | static |
438 | unsigned long lttng_condition_session_rotation_hash( | |
439 | const struct lttng_condition *_condition) | |
440 | { | |
441 | unsigned long hash, condition_type; | |
442 | struct lttng_condition_session_rotation *condition; | |
443 | ||
444 | condition = container_of(_condition, | |
445 | struct lttng_condition_session_rotation, parent); | |
446 | condition_type = (unsigned long) condition->parent.type; | |
447 | hash = hash_key_ulong((void *) condition_type, lttng_ht_seed); | |
448 | assert(condition->session_name); | |
449 | hash ^= hash_key_str(condition->session_name, lttng_ht_seed); | |
450 | return hash; | |
451 | } | |
9a2746aa | 452 | |
ab0ee2ca JG |
453 | /* |
454 | * The lttng_condition hashing code is kept in this file (rather than | |
455 | * condition.c) since it makes use of GPLv2 code (hashtable utils), which we | |
456 | * don't want to link in liblttng-ctl. | |
457 | */ | |
458 | static | |
9b63a4aa | 459 | unsigned long lttng_condition_hash(const struct lttng_condition *condition) |
ab0ee2ca JG |
460 | { |
461 | switch (condition->type) { | |
462 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
463 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
464 | return lttng_condition_buffer_usage_hash(condition); | |
e8360425 JD |
465 | case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE: |
466 | return lttng_condition_session_consumed_size_hash(condition); | |
a8393880 JG |
467 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING: |
468 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED: | |
469 | return lttng_condition_session_rotation_hash(condition); | |
ab0ee2ca JG |
470 | default: |
471 | ERR("[notification-thread] Unexpected condition type caught"); | |
472 | abort(); | |
473 | } | |
474 | } | |
475 | ||
e4db5ace JR |
476 | static |
477 | unsigned long hash_channel_key(struct channel_key *key) | |
478 | { | |
479 | unsigned long key_hash = hash_key_u64(&key->key, lttng_ht_seed); | |
480 | unsigned long domain_hash = hash_key_ulong( | |
481 | (void *) (unsigned long) key->domain, lttng_ht_seed); | |
482 | ||
483 | return key_hash ^ domain_hash; | |
484 | } | |
485 | ||
ab0ee2ca JG |
486 | static |
487 | void channel_info_destroy(struct channel_info *channel_info) | |
488 | { | |
489 | if (!channel_info) { | |
490 | return; | |
491 | } | |
492 | ||
8abe313a JG |
493 | if (channel_info->session_info) { |
494 | session_info_remove_channel(channel_info->session_info, | |
495 | channel_info); | |
496 | session_info_put(channel_info->session_info); | |
ab0ee2ca | 497 | } |
8abe313a JG |
498 | if (channel_info->name) { |
499 | free(channel_info->name); | |
ab0ee2ca JG |
500 | } |
501 | free(channel_info); | |
502 | } | |
503 | ||
8abe313a | 504 | /* Don't call directly, use the ref-counting mechanism. */ |
ab0ee2ca | 505 | static |
8abe313a | 506 | void session_info_destroy(void *_data) |
ab0ee2ca | 507 | { |
8abe313a | 508 | struct session_info *session_info = _data; |
3b68d0a3 | 509 | int ret; |
ab0ee2ca | 510 | |
8abe313a JG |
511 | assert(session_info); |
512 | if (session_info->channel_infos_ht) { | |
3b68d0a3 JR |
513 | ret = cds_lfht_destroy(session_info->channel_infos_ht, NULL); |
514 | if (ret) { | |
4c3f302b | 515 | ERR("[notification-thread] Failed to destroy channel information hash table"); |
3b68d0a3 | 516 | } |
8abe313a | 517 | } |
ea9a44f0 | 518 | lttng_session_trigger_list_destroy(session_info->trigger_list); |
1eee26c5 JG |
519 | |
520 | rcu_read_lock(); | |
521 | cds_lfht_del(session_info->sessions_ht, | |
522 | &session_info->sessions_ht_node); | |
523 | rcu_read_unlock(); | |
8abe313a JG |
524 | free(session_info->name); |
525 | free(session_info); | |
526 | } | |
ab0ee2ca | 527 | |
8abe313a JG |
528 | static |
529 | void session_info_get(struct session_info *session_info) | |
530 | { | |
531 | if (!session_info) { | |
532 | return; | |
533 | } | |
534 | lttng_ref_get(&session_info->ref); | |
535 | } | |
536 | ||
537 | static | |
538 | void session_info_put(struct session_info *session_info) | |
539 | { | |
540 | if (!session_info) { | |
541 | return; | |
ab0ee2ca | 542 | } |
8abe313a JG |
543 | lttng_ref_put(&session_info->ref); |
544 | } | |
545 | ||
546 | static | |
ea9a44f0 | 547 | struct session_info *session_info_create(const char *name, uid_t uid, gid_t gid, |
1eee26c5 JG |
548 | struct lttng_session_trigger_list *trigger_list, |
549 | struct cds_lfht *sessions_ht) | |
8abe313a JG |
550 | { |
551 | struct session_info *session_info; | |
ab0ee2ca | 552 | |
8abe313a | 553 | assert(name); |
ab0ee2ca | 554 | |
8abe313a JG |
555 | session_info = zmalloc(sizeof(*session_info)); |
556 | if (!session_info) { | |
557 | goto end; | |
558 | } | |
559 | lttng_ref_init(&session_info->ref, session_info_destroy); | |
560 | ||
561 | session_info->channel_infos_ht = cds_lfht_new(DEFAULT_HT_SIZE, | |
562 | 1, 0, CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, NULL); | |
563 | if (!session_info->channel_infos_ht) { | |
ab0ee2ca JG |
564 | goto error; |
565 | } | |
8abe313a JG |
566 | |
567 | cds_lfht_node_init(&session_info->sessions_ht_node); | |
568 | session_info->name = strdup(name); | |
569 | if (!session_info->name) { | |
ab0ee2ca JG |
570 | goto error; |
571 | } | |
8abe313a JG |
572 | session_info->uid = uid; |
573 | session_info->gid = gid; | |
ea9a44f0 | 574 | session_info->trigger_list = trigger_list; |
1eee26c5 | 575 | session_info->sessions_ht = sessions_ht; |
8abe313a JG |
576 | end: |
577 | return session_info; | |
578 | error: | |
579 | session_info_put(session_info); | |
580 | return NULL; | |
581 | } | |
582 | ||
583 | static | |
584 | void session_info_add_channel(struct session_info *session_info, | |
585 | struct channel_info *channel_info) | |
586 | { | |
587 | rcu_read_lock(); | |
588 | cds_lfht_add(session_info->channel_infos_ht, | |
589 | hash_channel_key(&channel_info->key), | |
590 | &channel_info->session_info_channels_ht_node); | |
591 | rcu_read_unlock(); | |
592 | } | |
593 | ||
594 | static | |
595 | void session_info_remove_channel(struct session_info *session_info, | |
596 | struct channel_info *channel_info) | |
597 | { | |
598 | rcu_read_lock(); | |
599 | cds_lfht_del(session_info->channel_infos_ht, | |
600 | &channel_info->session_info_channels_ht_node); | |
601 | rcu_read_unlock(); | |
602 | } | |
603 | ||
604 | static | |
605 | struct channel_info *channel_info_create(const char *channel_name, | |
606 | struct channel_key *channel_key, uint64_t channel_capacity, | |
607 | struct session_info *session_info) | |
608 | { | |
609 | struct channel_info *channel_info = zmalloc(sizeof(*channel_info)); | |
610 | ||
611 | if (!channel_info) { | |
612 | goto end; | |
613 | } | |
614 | ||
ab0ee2ca | 615 | cds_lfht_node_init(&channel_info->channels_ht_node); |
8abe313a JG |
616 | cds_lfht_node_init(&channel_info->session_info_channels_ht_node); |
617 | memcpy(&channel_info->key, channel_key, sizeof(*channel_key)); | |
618 | channel_info->capacity = channel_capacity; | |
619 | ||
620 | channel_info->name = strdup(channel_name); | |
621 | if (!channel_info->name) { | |
622 | goto error; | |
623 | } | |
624 | ||
625 | /* | |
626 | * Set the references between session and channel infos: | |
627 | * - channel_info holds a strong reference to session_info | |
628 | * - session_info holds a weak reference to channel_info | |
629 | */ | |
630 | session_info_get(session_info); | |
631 | session_info_add_channel(session_info, channel_info); | |
632 | channel_info->session_info = session_info; | |
ab0ee2ca | 633 | end: |
8abe313a | 634 | return channel_info; |
ab0ee2ca | 635 | error: |
8abe313a | 636 | channel_info_destroy(channel_info); |
ab0ee2ca JG |
637 | return NULL; |
638 | } | |
639 | ||
e4db5ace JR |
640 | /* This function must be called with the RCU read lock held. */ |
641 | static | |
642 | int evaluate_condition_for_client(struct lttng_trigger *trigger, | |
643 | struct lttng_condition *condition, | |
644 | struct notification_client *client, | |
645 | struct notification_thread_state *state) | |
646 | { | |
647 | int ret; | |
648 | struct cds_lfht_iter iter; | |
649 | struct cds_lfht_node *node; | |
650 | struct channel_info *channel_info = NULL; | |
651 | struct channel_key *channel_key = NULL; | |
652 | struct channel_state_sample *last_sample = NULL; | |
653 | struct lttng_channel_trigger_list *channel_trigger_list = NULL; | |
654 | struct lttng_evaluation *evaluation = NULL; | |
655 | struct notification_client_list client_list = { 0 }; | |
656 | struct notification_client_list_element client_list_element = { 0 }; | |
657 | ||
658 | assert(trigger); | |
659 | assert(condition); | |
660 | assert(client); | |
661 | assert(state); | |
662 | ||
663 | /* Find the channel associated with the trigger. */ | |
664 | cds_lfht_for_each_entry(state->channel_triggers_ht, &iter, | |
665 | channel_trigger_list , channel_triggers_ht_node) { | |
666 | struct lttng_trigger_list_element *element; | |
667 | ||
668 | cds_list_for_each_entry(element, &channel_trigger_list->list, node) { | |
9b63a4aa JG |
669 | const struct lttng_condition *current_condition = |
670 | lttng_trigger_get_const_condition( | |
e4db5ace JR |
671 | element->trigger); |
672 | ||
673 | assert(current_condition); | |
674 | if (!lttng_condition_is_equal(condition, | |
2ae99f0b | 675 | current_condition)) { |
e4db5ace JR |
676 | continue; |
677 | } | |
678 | ||
679 | /* Found the trigger, save the channel key. */ | |
680 | channel_key = &channel_trigger_list->channel_key; | |
681 | break; | |
682 | } | |
683 | if (channel_key) { | |
684 | /* The channel key was found stop iteration. */ | |
685 | break; | |
686 | } | |
687 | } | |
688 | ||
689 | if (!channel_key){ | |
690 | /* No channel found; normal exit. */ | |
691 | DBG("[notification-thread] No channel associated with newly subscribed-to condition"); | |
692 | ret = 0; | |
693 | goto end; | |
694 | } | |
695 | ||
696 | /* Fetch channel info for the matching channel. */ | |
697 | cds_lfht_lookup(state->channels_ht, | |
698 | hash_channel_key(channel_key), | |
699 | match_channel_info, | |
700 | channel_key, | |
701 | &iter); | |
702 | node = cds_lfht_iter_get_node(&iter); | |
703 | assert(node); | |
704 | channel_info = caa_container_of(node, struct channel_info, | |
705 | channels_ht_node); | |
706 | ||
707 | /* Retrieve the channel's last sample, if it exists. */ | |
708 | cds_lfht_lookup(state->channel_state_ht, | |
709 | hash_channel_key(channel_key), | |
710 | match_channel_state_sample, | |
711 | channel_key, | |
712 | &iter); | |
713 | node = cds_lfht_iter_get_node(&iter); | |
714 | if (node) { | |
715 | last_sample = caa_container_of(node, | |
716 | struct channel_state_sample, | |
717 | channel_state_ht_node); | |
718 | } else { | |
719 | /* Nothing to evaluate, no sample was ever taken. Normal exit */ | |
720 | DBG("[notification-thread] No channel sample associated with newly subscribed-to condition"); | |
721 | ret = 0; | |
722 | goto end; | |
723 | } | |
724 | ||
e8360425 JD |
725 | ret = evaluate_condition(condition, &evaluation, state, |
726 | NULL, last_sample, | |
727 | 0, channel_info->session_info->consumed_data_size, | |
728 | channel_info); | |
e4db5ace | 729 | if (ret) { |
066a3c82 | 730 | WARN("[notification-thread] Fatal error occurred while evaluating a newly subscribed-to condition"); |
e4db5ace JR |
731 | goto end; |
732 | } | |
733 | ||
734 | if (!evaluation) { | |
735 | /* Evaluation yielded nothing. Normal exit. */ | |
736 | DBG("[notification-thread] Newly subscribed-to condition evaluated to false, nothing to report to client"); | |
737 | ret = 0; | |
738 | goto end; | |
739 | } | |
740 | ||
741 | /* | |
742 | * Create a temporary client list with the client currently | |
743 | * subscribing. | |
744 | */ | |
745 | cds_lfht_node_init(&client_list.notification_trigger_ht_node); | |
746 | CDS_INIT_LIST_HEAD(&client_list.list); | |
747 | client_list.trigger = trigger; | |
748 | ||
749 | CDS_INIT_LIST_HEAD(&client_list_element.node); | |
750 | client_list_element.client = client; | |
751 | cds_list_add(&client_list_element.node, &client_list.list); | |
752 | ||
753 | /* Send evaluation result to the newly-subscribed client. */ | |
754 | DBG("[notification-thread] Newly subscribed-to condition evaluated to true, notifying client"); | |
755 | ret = send_evaluation_to_clients(trigger, evaluation, &client_list, | |
8abe313a JG |
756 | state, channel_info->session_info->uid, |
757 | channel_info->session_info->gid); | |
e4db5ace JR |
758 | |
759 | end: | |
760 | return ret; | |
761 | } | |
762 | ||
ab0ee2ca JG |
763 | static |
764 | int notification_thread_client_subscribe(struct notification_client *client, | |
765 | struct lttng_condition *condition, | |
766 | struct notification_thread_state *state, | |
767 | enum lttng_notification_channel_status *_status) | |
768 | { | |
769 | int ret = 0; | |
770 | struct cds_lfht_iter iter; | |
771 | struct cds_lfht_node *node; | |
772 | struct notification_client_list *client_list; | |
773 | struct lttng_condition_list_element *condition_list_element = NULL; | |
774 | struct notification_client_list_element *client_list_element = NULL; | |
775 | enum lttng_notification_channel_status status = | |
776 | LTTNG_NOTIFICATION_CHANNEL_STATUS_OK; | |
777 | ||
778 | /* | |
779 | * Ensure that the client has not already subscribed to this condition | |
780 | * before. | |
781 | */ | |
782 | cds_list_for_each_entry(condition_list_element, &client->condition_list, node) { | |
783 | if (lttng_condition_is_equal(condition_list_element->condition, | |
784 | condition)) { | |
785 | status = LTTNG_NOTIFICATION_CHANNEL_STATUS_ALREADY_SUBSCRIBED; | |
786 | goto end; | |
787 | } | |
788 | } | |
789 | ||
790 | condition_list_element = zmalloc(sizeof(*condition_list_element)); | |
791 | if (!condition_list_element) { | |
792 | ret = -1; | |
793 | goto error; | |
794 | } | |
795 | client_list_element = zmalloc(sizeof(*client_list_element)); | |
796 | if (!client_list_element) { | |
797 | ret = -1; | |
798 | goto error; | |
799 | } | |
800 | ||
801 | rcu_read_lock(); | |
802 | ||
803 | /* | |
804 | * Add the newly-subscribed condition to the client's subscription list. | |
805 | */ | |
806 | CDS_INIT_LIST_HEAD(&condition_list_element->node); | |
807 | condition_list_element->condition = condition; | |
808 | cds_list_add(&condition_list_element->node, &client->condition_list); | |
809 | ||
ab0ee2ca JG |
810 | cds_lfht_lookup(state->notification_trigger_clients_ht, |
811 | lttng_condition_hash(condition), | |
812 | match_client_list_condition, | |
813 | condition, | |
814 | &iter); | |
815 | node = cds_lfht_iter_get_node(&iter); | |
816 | if (!node) { | |
2ae99f0b JG |
817 | /* |
818 | * No notification-emiting trigger registered with this | |
819 | * condition. We don't evaluate the condition right away | |
820 | * since this trigger is not registered yet. | |
821 | */ | |
4fb43b68 | 822 | free(client_list_element); |
ab0ee2ca JG |
823 | goto end_unlock; |
824 | } | |
825 | ||
826 | client_list = caa_container_of(node, struct notification_client_list, | |
827 | notification_trigger_ht_node); | |
2ae99f0b JG |
828 | /* |
829 | * The condition to which the client just subscribed is evaluated | |
830 | * at this point so that conditions that are already TRUE result | |
831 | * in a notification being sent out. | |
832 | */ | |
e4db5ace JR |
833 | if (evaluate_condition_for_client(client_list->trigger, condition, |
834 | client, state)) { | |
835 | WARN("[notification-thread] Evaluation of a condition on client subscription failed, aborting."); | |
836 | ret = -1; | |
4bd5b4af | 837 | free(client_list_element); |
e4db5ace JR |
838 | goto end_unlock; |
839 | } | |
840 | ||
841 | /* | |
842 | * Add the client to the list of clients interested in a given trigger | |
843 | * if a "notification" trigger with a corresponding condition was | |
844 | * added prior. | |
845 | */ | |
ab0ee2ca JG |
846 | client_list_element->client = client; |
847 | CDS_INIT_LIST_HEAD(&client_list_element->node); | |
848 | cds_list_add(&client_list_element->node, &client_list->list); | |
849 | end_unlock: | |
850 | rcu_read_unlock(); | |
851 | end: | |
852 | if (_status) { | |
853 | *_status = status; | |
854 | } | |
855 | return ret; | |
856 | error: | |
857 | free(condition_list_element); | |
858 | free(client_list_element); | |
859 | return ret; | |
860 | } | |
861 | ||
862 | static | |
863 | int notification_thread_client_unsubscribe( | |
864 | struct notification_client *client, | |
865 | struct lttng_condition *condition, | |
866 | struct notification_thread_state *state, | |
867 | enum lttng_notification_channel_status *_status) | |
868 | { | |
869 | struct cds_lfht_iter iter; | |
870 | struct cds_lfht_node *node; | |
871 | struct notification_client_list *client_list; | |
872 | struct lttng_condition_list_element *condition_list_element, | |
873 | *condition_tmp; | |
874 | struct notification_client_list_element *client_list_element, | |
875 | *client_tmp; | |
876 | bool condition_found = false; | |
877 | enum lttng_notification_channel_status status = | |
878 | LTTNG_NOTIFICATION_CHANNEL_STATUS_OK; | |
879 | ||
880 | /* Remove the condition from the client's condition list. */ | |
881 | cds_list_for_each_entry_safe(condition_list_element, condition_tmp, | |
882 | &client->condition_list, node) { | |
883 | if (!lttng_condition_is_equal(condition_list_element->condition, | |
884 | condition)) { | |
885 | continue; | |
886 | } | |
887 | ||
888 | cds_list_del(&condition_list_element->node); | |
889 | /* | |
890 | * The caller may be iterating on the client's conditions to | |
891 | * tear down a client's connection. In this case, the condition | |
892 | * will be destroyed at the end. | |
893 | */ | |
894 | if (condition != condition_list_element->condition) { | |
895 | lttng_condition_destroy( | |
896 | condition_list_element->condition); | |
897 | } | |
898 | free(condition_list_element); | |
899 | condition_found = true; | |
900 | break; | |
901 | } | |
902 | ||
903 | if (!condition_found) { | |
904 | status = LTTNG_NOTIFICATION_CHANNEL_STATUS_UNKNOWN_CONDITION; | |
905 | goto end; | |
906 | } | |
907 | ||
908 | /* | |
909 | * Remove the client from the list of clients interested the trigger | |
910 | * matching the condition. | |
911 | */ | |
912 | rcu_read_lock(); | |
913 | cds_lfht_lookup(state->notification_trigger_clients_ht, | |
914 | lttng_condition_hash(condition), | |
915 | match_client_list_condition, | |
916 | condition, | |
917 | &iter); | |
918 | node = cds_lfht_iter_get_node(&iter); | |
919 | if (!node) { | |
920 | goto end_unlock; | |
921 | } | |
922 | ||
923 | client_list = caa_container_of(node, struct notification_client_list, | |
924 | notification_trigger_ht_node); | |
925 | cds_list_for_each_entry_safe(client_list_element, client_tmp, | |
926 | &client_list->list, node) { | |
927 | if (client_list_element->client->socket != client->socket) { | |
928 | continue; | |
929 | } | |
930 | cds_list_del(&client_list_element->node); | |
931 | free(client_list_element); | |
932 | break; | |
933 | } | |
934 | end_unlock: | |
935 | rcu_read_unlock(); | |
936 | end: | |
937 | lttng_condition_destroy(condition); | |
938 | if (_status) { | |
939 | *_status = status; | |
940 | } | |
941 | return 0; | |
942 | } | |
943 | ||
944 | static | |
945 | void notification_client_destroy(struct notification_client *client, | |
946 | struct notification_thread_state *state) | |
947 | { | |
948 | struct lttng_condition_list_element *condition_list_element, *tmp; | |
949 | ||
950 | if (!client) { | |
951 | return; | |
952 | } | |
953 | ||
954 | /* Release all conditions to which the client was subscribed. */ | |
955 | cds_list_for_each_entry_safe(condition_list_element, tmp, | |
956 | &client->condition_list, node) { | |
957 | (void) notification_thread_client_unsubscribe(client, | |
958 | condition_list_element->condition, state, NULL); | |
959 | } | |
960 | ||
961 | if (client->socket >= 0) { | |
962 | (void) lttcomm_close_unix_sock(client->socket); | |
963 | } | |
964 | lttng_dynamic_buffer_reset(&client->communication.inbound.buffer); | |
965 | lttng_dynamic_buffer_reset(&client->communication.outbound.buffer); | |
966 | free(client); | |
967 | } | |
968 | ||
969 | /* | |
970 | * Call with rcu_read_lock held (and hold for the lifetime of the returned | |
971 | * client pointer). | |
972 | */ | |
973 | static | |
974 | struct notification_client *get_client_from_socket(int socket, | |
975 | struct notification_thread_state *state) | |
976 | { | |
977 | struct cds_lfht_iter iter; | |
978 | struct cds_lfht_node *node; | |
979 | struct notification_client *client = NULL; | |
980 | ||
981 | cds_lfht_lookup(state->client_socket_ht, | |
982 | hash_key_ulong((void *) (unsigned long) socket, lttng_ht_seed), | |
983 | match_client, | |
984 | (void *) (unsigned long) socket, | |
985 | &iter); | |
986 | node = cds_lfht_iter_get_node(&iter); | |
987 | if (!node) { | |
988 | goto end; | |
989 | } | |
990 | ||
991 | client = caa_container_of(node, struct notification_client, | |
992 | client_socket_ht_node); | |
993 | end: | |
994 | return client; | |
995 | } | |
996 | ||
997 | static | |
e8360425 | 998 | bool buffer_usage_condition_applies_to_channel( |
51eab943 JG |
999 | const struct lttng_condition *condition, |
1000 | const struct channel_info *channel_info) | |
ab0ee2ca JG |
1001 | { |
1002 | enum lttng_condition_status status; | |
e8360425 JD |
1003 | enum lttng_domain_type condition_domain; |
1004 | const char *condition_session_name = NULL; | |
1005 | const char *condition_channel_name = NULL; | |
ab0ee2ca | 1006 | |
e8360425 JD |
1007 | status = lttng_condition_buffer_usage_get_domain_type(condition, |
1008 | &condition_domain); | |
1009 | assert(status == LTTNG_CONDITION_STATUS_OK); | |
1010 | if (channel_info->key.domain != condition_domain) { | |
ab0ee2ca JG |
1011 | goto fail; |
1012 | } | |
1013 | ||
e8360425 JD |
1014 | status = lttng_condition_buffer_usage_get_session_name( |
1015 | condition, &condition_session_name); | |
1016 | assert((status == LTTNG_CONDITION_STATUS_OK) && condition_session_name); | |
1017 | ||
1018 | status = lttng_condition_buffer_usage_get_channel_name( | |
1019 | condition, &condition_channel_name); | |
1020 | assert((status == LTTNG_CONDITION_STATUS_OK) && condition_channel_name); | |
1021 | ||
1022 | if (strcmp(channel_info->session_info->name, condition_session_name)) { | |
1023 | goto fail; | |
1024 | } | |
1025 | if (strcmp(channel_info->name, condition_channel_name)) { | |
ab0ee2ca JG |
1026 | goto fail; |
1027 | } | |
1028 | ||
e8360425 JD |
1029 | return true; |
1030 | fail: | |
1031 | return false; | |
1032 | } | |
1033 | ||
1034 | static | |
1035 | bool session_consumed_size_condition_applies_to_channel( | |
51eab943 JG |
1036 | const struct lttng_condition *condition, |
1037 | const struct channel_info *channel_info) | |
e8360425 JD |
1038 | { |
1039 | enum lttng_condition_status status; | |
1040 | const char *condition_session_name = NULL; | |
1041 | ||
1042 | status = lttng_condition_session_consumed_size_get_session_name( | |
1043 | condition, &condition_session_name); | |
1044 | assert((status == LTTNG_CONDITION_STATUS_OK) && condition_session_name); | |
1045 | ||
1046 | if (strcmp(channel_info->session_info->name, condition_session_name)) { | |
ab0ee2ca JG |
1047 | goto fail; |
1048 | } | |
1049 | ||
e8360425 JD |
1050 | return true; |
1051 | fail: | |
1052 | return false; | |
1053 | } | |
ab0ee2ca | 1054 | |
51eab943 JG |
1055 | /* |
1056 | * Get the type of object to which a given trigger applies. Binding lets | |
1057 | * the notification system evaluate a trigger's condition when a given | |
1058 | * object's state is updated. | |
1059 | * | |
1060 | * For instance, a condition bound to a channel will be evaluated everytime | |
1061 | * the channel's state is changed by a channel monitoring sample. | |
1062 | */ | |
e8360425 | 1063 | static |
51eab943 JG |
1064 | enum lttng_object_type get_trigger_binding_object( |
1065 | const struct lttng_trigger *trigger) | |
e8360425 | 1066 | { |
51eab943 JG |
1067 | const struct lttng_condition *condition; |
1068 | ||
1069 | condition = lttng_trigger_get_const_condition(trigger); | |
1070 | switch (lttng_condition_get_type(condition)) { | |
1071 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
1072 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
1073 | case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE: | |
1074 | return LTTNG_OBJECT_TYPE_CHANNEL; | |
1075 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING: | |
1076 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED: | |
1077 | return LTTNG_OBJECT_TYPE_SESSION; | |
1078 | default: | |
1079 | return LTTNG_OBJECT_TYPE_UNKNOWN; | |
1080 | } | |
1081 | } | |
1082 | ||
1083 | static | |
1084 | bool trigger_applies_to_channel(const struct lttng_trigger *trigger, | |
1085 | const struct channel_info *channel_info) | |
1086 | { | |
1087 | const struct lttng_condition *condition; | |
e8360425 | 1088 | bool trigger_applies; |
ab0ee2ca | 1089 | |
51eab943 | 1090 | condition = lttng_trigger_get_const_condition(trigger); |
e8360425 | 1091 | if (!condition) { |
ab0ee2ca JG |
1092 | goto fail; |
1093 | } | |
e8360425 JD |
1094 | |
1095 | switch (lttng_condition_get_type(condition)) { | |
1096 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
1097 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
1098 | trigger_applies = buffer_usage_condition_applies_to_channel( | |
1099 | condition, channel_info); | |
1100 | break; | |
1101 | case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE: | |
1102 | trigger_applies = session_consumed_size_condition_applies_to_channel( | |
1103 | condition, channel_info); | |
1104 | break; | |
1105 | default: | |
ab0ee2ca JG |
1106 | goto fail; |
1107 | } | |
1108 | ||
e8360425 | 1109 | return trigger_applies; |
ab0ee2ca JG |
1110 | fail: |
1111 | return false; | |
1112 | } | |
1113 | ||
1114 | static | |
1115 | bool trigger_applies_to_client(struct lttng_trigger *trigger, | |
1116 | struct notification_client *client) | |
1117 | { | |
1118 | bool applies = false; | |
1119 | struct lttng_condition_list_element *condition_list_element; | |
1120 | ||
1121 | cds_list_for_each_entry(condition_list_element, &client->condition_list, | |
1122 | node) { | |
1123 | applies = lttng_condition_is_equal( | |
1124 | condition_list_element->condition, | |
1125 | lttng_trigger_get_condition(trigger)); | |
1126 | if (applies) { | |
1127 | break; | |
1128 | } | |
1129 | } | |
1130 | return applies; | |
1131 | } | |
1132 | ||
8abe313a JG |
1133 | static |
1134 | int match_session(struct cds_lfht_node *node, const void *key) | |
1135 | { | |
1136 | const char *name = key; | |
1137 | struct session_info *session_info = caa_container_of( | |
1138 | node, struct session_info, sessions_ht_node); | |
1139 | ||
1140 | return !strcmp(session_info->name, name); | |
1141 | } | |
1142 | ||
ea9a44f0 JG |
1143 | /* |
1144 | * Allocate an empty lttng_session_trigger_list for the session named | |
1145 | * 'session_name'. | |
1146 | * | |
1147 | * No ownership of 'session_name' is assumed by the session trigger list. | |
1148 | * It is the caller's responsability to ensure the session name is alive | |
1149 | * for as long as this list is. | |
1150 | */ | |
1151 | static | |
1152 | struct lttng_session_trigger_list *lttng_session_trigger_list_create( | |
1153 | const char *session_name, | |
1154 | struct cds_lfht *session_triggers_ht) | |
1155 | { | |
1156 | struct lttng_session_trigger_list *list; | |
1157 | ||
1158 | list = zmalloc(sizeof(*list)); | |
1159 | if (!list) { | |
1160 | goto end; | |
1161 | } | |
1162 | list->session_name = session_name; | |
1163 | CDS_INIT_LIST_HEAD(&list->list); | |
1164 | cds_lfht_node_init(&list->session_triggers_ht_node); | |
1165 | list->session_triggers_ht = session_triggers_ht; | |
1166 | ||
1167 | rcu_read_lock(); | |
1168 | /* Publish the list through the session_triggers_ht. */ | |
1169 | cds_lfht_add(session_triggers_ht, | |
1170 | hash_key_str(session_name, lttng_ht_seed), | |
1171 | &list->session_triggers_ht_node); | |
1172 | rcu_read_unlock(); | |
1173 | end: | |
1174 | return list; | |
1175 | } | |
1176 | ||
1177 | static | |
1178 | void free_session_trigger_list_rcu(struct rcu_head *node) | |
1179 | { | |
1180 | free(caa_container_of(node, struct lttng_session_trigger_list, | |
1181 | rcu_node)); | |
1182 | } | |
1183 | ||
1184 | static | |
1185 | void lttng_session_trigger_list_destroy(struct lttng_session_trigger_list *list) | |
1186 | { | |
1187 | struct lttng_trigger_list_element *trigger_list_element, *tmp; | |
1188 | ||
1189 | /* Empty the list element by element, and then free the list itself. */ | |
1190 | cds_list_for_each_entry_safe(trigger_list_element, tmp, | |
1191 | &list->list, node) { | |
1192 | cds_list_del(&trigger_list_element->node); | |
1193 | free(trigger_list_element); | |
1194 | } | |
1195 | rcu_read_lock(); | |
1196 | /* Unpublish the list from the session_triggers_ht. */ | |
1197 | cds_lfht_del(list->session_triggers_ht, | |
1198 | &list->session_triggers_ht_node); | |
1199 | rcu_read_unlock(); | |
1200 | call_rcu(&list->rcu_node, free_session_trigger_list_rcu); | |
1201 | } | |
1202 | ||
1203 | static | |
1204 | int lttng_session_trigger_list_add(struct lttng_session_trigger_list *list, | |
1205 | const struct lttng_trigger *trigger) | |
1206 | { | |
1207 | int ret = 0; | |
1208 | struct lttng_trigger_list_element *new_element = | |
1209 | zmalloc(sizeof(*new_element)); | |
1210 | ||
1211 | if (!new_element) { | |
1212 | ret = -1; | |
1213 | goto end; | |
1214 | } | |
1215 | CDS_INIT_LIST_HEAD(&new_element->node); | |
1216 | new_element->trigger = trigger; | |
1217 | cds_list_add(&new_element->node, &list->list); | |
1218 | end: | |
1219 | return ret; | |
1220 | } | |
1221 | ||
1222 | static | |
1223 | bool trigger_applies_to_session(const struct lttng_trigger *trigger, | |
1224 | const char *session_name) | |
1225 | { | |
1226 | bool applies = false; | |
1227 | const struct lttng_condition *condition; | |
1228 | ||
1229 | condition = lttng_trigger_get_const_condition(trigger); | |
1230 | switch (lttng_condition_get_type(condition)) { | |
1231 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING: | |
1232 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED: | |
1233 | { | |
1234 | enum lttng_condition_status condition_status; | |
1235 | const char *condition_session_name; | |
1236 | ||
1237 | condition_status = lttng_condition_session_rotation_get_session_name( | |
1238 | condition, &condition_session_name); | |
1239 | if (condition_status != LTTNG_CONDITION_STATUS_OK) { | |
1240 | ERR("[notification-thread] Failed to retrieve session rotation condition's session name"); | |
1241 | goto end; | |
1242 | } | |
1243 | ||
1244 | assert(condition_session_name); | |
1245 | applies = !strcmp(condition_session_name, session_name); | |
1246 | break; | |
1247 | } | |
1248 | default: | |
1249 | goto end; | |
1250 | } | |
1251 | end: | |
1252 | return applies; | |
1253 | } | |
1254 | ||
1255 | /* | |
1256 | * Allocate and initialize an lttng_session_trigger_list which contains | |
1257 | * all triggers that apply to the session named 'session_name'. | |
1258 | * | |
1259 | * No ownership of 'session_name' is assumed by the session trigger list. | |
1260 | * It is the caller's responsability to ensure the session name is alive | |
1261 | * for as long as this list is. | |
1262 | */ | |
1263 | static | |
1264 | struct lttng_session_trigger_list *lttng_session_trigger_list_build( | |
1265 | const struct notification_thread_state *state, | |
1266 | const char *session_name) | |
1267 | { | |
1268 | int trigger_count = 0; | |
1269 | struct lttng_session_trigger_list *session_trigger_list = NULL; | |
1270 | struct lttng_trigger_ht_element *trigger_ht_element = NULL; | |
1271 | struct cds_lfht_iter iter; | |
1272 | ||
1273 | session_trigger_list = lttng_session_trigger_list_create(session_name, | |
1274 | state->session_triggers_ht); | |
1275 | ||
1276 | /* Add all triggers applying to the session named 'session_name'. */ | |
1277 | cds_lfht_for_each_entry(state->triggers_ht, &iter, trigger_ht_element, | |
1278 | node) { | |
1279 | int ret; | |
1280 | ||
1281 | if (!trigger_applies_to_session(trigger_ht_element->trigger, | |
1282 | session_name)) { | |
1283 | continue; | |
1284 | } | |
1285 | ||
1286 | ret = lttng_session_trigger_list_add(session_trigger_list, | |
1287 | trigger_ht_element->trigger); | |
1288 | if (ret) { | |
1289 | goto error; | |
1290 | } | |
1291 | ||
1292 | trigger_count++; | |
1293 | } | |
1294 | ||
1295 | DBG("[notification-thread] Found %i triggers that apply to newly created session", | |
1296 | trigger_count); | |
1297 | return session_trigger_list; | |
1298 | error: | |
1299 | lttng_session_trigger_list_destroy(session_trigger_list); | |
1300 | return NULL; | |
1301 | } | |
1302 | ||
8abe313a JG |
1303 | static |
1304 | struct session_info *find_or_create_session_info( | |
1305 | struct notification_thread_state *state, | |
1306 | const char *name, uid_t uid, gid_t gid) | |
1307 | { | |
1308 | struct session_info *session = NULL; | |
1309 | struct cds_lfht_node *node; | |
1310 | struct cds_lfht_iter iter; | |
ea9a44f0 | 1311 | struct lttng_session_trigger_list *trigger_list; |
8abe313a JG |
1312 | |
1313 | rcu_read_lock(); | |
1314 | cds_lfht_lookup(state->sessions_ht, | |
1315 | hash_key_str(name, lttng_ht_seed), | |
1316 | match_session, | |
1317 | name, | |
1318 | &iter); | |
1319 | node = cds_lfht_iter_get_node(&iter); | |
1320 | if (node) { | |
1321 | DBG("[notification-thread] Found session info of session \"%s\" (uid = %i, gid = %i)", | |
1322 | name, uid, gid); | |
1323 | session = caa_container_of(node, struct session_info, | |
1324 | sessions_ht_node); | |
1325 | assert(session->uid == uid); | |
1326 | assert(session->gid == gid); | |
1eee26c5 JG |
1327 | session_info_get(session); |
1328 | goto end; | |
ea9a44f0 JG |
1329 | } |
1330 | ||
1331 | trigger_list = lttng_session_trigger_list_build(state, name); | |
1332 | if (!trigger_list) { | |
1333 | goto error; | |
8abe313a JG |
1334 | } |
1335 | ||
1eee26c5 JG |
1336 | session = session_info_create(name, uid, gid, trigger_list, |
1337 | state->sessions_ht); | |
8abe313a JG |
1338 | if (!session) { |
1339 | ERR("[notification-thread] Failed to allocation session info for session \"%s\" (uid = %i, gid = %i)", | |
1340 | name, uid, gid); | |
ea9a44f0 | 1341 | goto error; |
8abe313a | 1342 | } |
ea9a44f0 | 1343 | trigger_list = NULL; |
577983cb JG |
1344 | |
1345 | cds_lfht_add(state->sessions_ht, hash_key_str(name, lttng_ht_seed), | |
9b63a4aa | 1346 | &session->sessions_ht_node); |
1eee26c5 | 1347 | end: |
8abe313a JG |
1348 | rcu_read_unlock(); |
1349 | return session; | |
ea9a44f0 JG |
1350 | error: |
1351 | rcu_read_unlock(); | |
1352 | session_info_put(session); | |
1353 | return NULL; | |
8abe313a JG |
1354 | } |
1355 | ||
ab0ee2ca JG |
1356 | static |
1357 | int handle_notification_thread_command_add_channel( | |
8abe313a JG |
1358 | struct notification_thread_state *state, |
1359 | const char *session_name, uid_t session_uid, gid_t session_gid, | |
1360 | const char *channel_name, enum lttng_domain_type channel_domain, | |
1361 | uint64_t channel_key_int, uint64_t channel_capacity, | |
1362 | enum lttng_error_code *cmd_result) | |
ab0ee2ca JG |
1363 | { |
1364 | struct cds_list_head trigger_list; | |
8abe313a JG |
1365 | struct channel_info *new_channel_info = NULL; |
1366 | struct channel_key channel_key = { | |
1367 | .key = channel_key_int, | |
1368 | .domain = channel_domain, | |
1369 | }; | |
ab0ee2ca JG |
1370 | struct lttng_channel_trigger_list *channel_trigger_list = NULL; |
1371 | struct lttng_trigger_ht_element *trigger_ht_element = NULL; | |
1372 | int trigger_count = 0; | |
1373 | struct cds_lfht_iter iter; | |
8abe313a | 1374 | struct session_info *session_info = NULL; |
ab0ee2ca JG |
1375 | |
1376 | DBG("[notification-thread] Adding channel %s from session %s, channel key = %" PRIu64 " in %s domain", | |
8abe313a JG |
1377 | channel_name, session_name, channel_key_int, |
1378 | channel_domain == LTTNG_DOMAIN_KERNEL ? "kernel" : "user space"); | |
ab0ee2ca JG |
1379 | |
1380 | CDS_INIT_LIST_HEAD(&trigger_list); | |
1381 | ||
8abe313a JG |
1382 | session_info = find_or_create_session_info(state, session_name, |
1383 | session_uid, session_gid); | |
1384 | if (!session_info) { | |
1385 | /* Allocation error or an internal error occured. */ | |
ab0ee2ca JG |
1386 | goto error; |
1387 | } | |
1388 | ||
8abe313a JG |
1389 | new_channel_info = channel_info_create(channel_name, &channel_key, |
1390 | channel_capacity, session_info); | |
1391 | if (!new_channel_info) { | |
1392 | goto error; | |
1393 | } | |
ab0ee2ca JG |
1394 | |
1395 | /* Build a list of all triggers applying to the new channel. */ | |
1396 | cds_lfht_for_each_entry(state->triggers_ht, &iter, trigger_ht_element, | |
1397 | node) { | |
1398 | struct lttng_trigger_list_element *new_element; | |
1399 | ||
1400 | if (!trigger_applies_to_channel(trigger_ht_element->trigger, | |
8abe313a | 1401 | new_channel_info)) { |
ab0ee2ca JG |
1402 | continue; |
1403 | } | |
1404 | ||
1405 | new_element = zmalloc(sizeof(*new_element)); | |
1406 | if (!new_element) { | |
1407 | goto error; | |
1408 | } | |
1409 | CDS_INIT_LIST_HEAD(&new_element->node); | |
1410 | new_element->trigger = trigger_ht_element->trigger; | |
1411 | cds_list_add(&new_element->node, &trigger_list); | |
1412 | trigger_count++; | |
1413 | } | |
1414 | ||
1415 | DBG("[notification-thread] Found %i triggers that apply to newly added channel", | |
1416 | trigger_count); | |
1417 | channel_trigger_list = zmalloc(sizeof(*channel_trigger_list)); | |
1418 | if (!channel_trigger_list) { | |
1419 | goto error; | |
1420 | } | |
8abe313a | 1421 | channel_trigger_list->channel_key = new_channel_info->key; |
ab0ee2ca JG |
1422 | CDS_INIT_LIST_HEAD(&channel_trigger_list->list); |
1423 | cds_lfht_node_init(&channel_trigger_list->channel_triggers_ht_node); | |
1424 | cds_list_splice(&trigger_list, &channel_trigger_list->list); | |
1425 | ||
1426 | rcu_read_lock(); | |
1427 | /* Add channel to the channel_ht which owns the channel_infos. */ | |
1428 | cds_lfht_add(state->channels_ht, | |
8abe313a | 1429 | hash_channel_key(&new_channel_info->key), |
ab0ee2ca JG |
1430 | &new_channel_info->channels_ht_node); |
1431 | /* | |
1432 | * Add the list of triggers associated with this channel to the | |
1433 | * channel_triggers_ht. | |
1434 | */ | |
1435 | cds_lfht_add(state->channel_triggers_ht, | |
8abe313a | 1436 | hash_channel_key(&new_channel_info->key), |
ab0ee2ca JG |
1437 | &channel_trigger_list->channel_triggers_ht_node); |
1438 | rcu_read_unlock(); | |
1eee26c5 | 1439 | session_info_put(session_info); |
ab0ee2ca JG |
1440 | *cmd_result = LTTNG_OK; |
1441 | return 0; | |
1442 | error: | |
ab0ee2ca | 1443 | channel_info_destroy(new_channel_info); |
8abe313a | 1444 | session_info_put(session_info); |
ab0ee2ca JG |
1445 | return 1; |
1446 | } | |
1447 | ||
1448 | static | |
1449 | int handle_notification_thread_command_remove_channel( | |
1450 | struct notification_thread_state *state, | |
1451 | uint64_t channel_key, enum lttng_domain_type domain, | |
1452 | enum lttng_error_code *cmd_result) | |
1453 | { | |
1454 | struct cds_lfht_node *node; | |
1455 | struct cds_lfht_iter iter; | |
1456 | struct lttng_channel_trigger_list *trigger_list; | |
1457 | struct lttng_trigger_list_element *trigger_list_element, *tmp; | |
1458 | struct channel_key key = { .key = channel_key, .domain = domain }; | |
1459 | struct channel_info *channel_info; | |
1460 | ||
1461 | DBG("[notification-thread] Removing channel key = %" PRIu64 " in %s domain", | |
1462 | channel_key, domain == LTTNG_DOMAIN_KERNEL ? "kernel" : "user space"); | |
1463 | ||
1464 | rcu_read_lock(); | |
1465 | ||
1466 | cds_lfht_lookup(state->channel_triggers_ht, | |
1467 | hash_channel_key(&key), | |
1468 | match_channel_trigger_list, | |
1469 | &key, | |
1470 | &iter); | |
1471 | node = cds_lfht_iter_get_node(&iter); | |
1472 | /* | |
1473 | * There is a severe internal error if we are being asked to remove a | |
1474 | * channel that doesn't exist. | |
1475 | */ | |
1476 | if (!node) { | |
1477 | ERR("[notification-thread] Channel being removed is unknown to the notification thread"); | |
1478 | goto end; | |
1479 | } | |
1480 | ||
1481 | /* Free the list of triggers associated with this channel. */ | |
1482 | trigger_list = caa_container_of(node, struct lttng_channel_trigger_list, | |
1483 | channel_triggers_ht_node); | |
1484 | cds_list_for_each_entry_safe(trigger_list_element, tmp, | |
1485 | &trigger_list->list, node) { | |
1486 | cds_list_del(&trigger_list_element->node); | |
1487 | free(trigger_list_element); | |
1488 | } | |
1489 | cds_lfht_del(state->channel_triggers_ht, node); | |
1490 | free(trigger_list); | |
1491 | ||
1492 | /* Free sampled channel state. */ | |
1493 | cds_lfht_lookup(state->channel_state_ht, | |
1494 | hash_channel_key(&key), | |
1495 | match_channel_state_sample, | |
1496 | &key, | |
1497 | &iter); | |
1498 | node = cds_lfht_iter_get_node(&iter); | |
1499 | /* | |
1500 | * This is expected to be NULL if the channel is destroyed before we | |
1501 | * received a sample. | |
1502 | */ | |
1503 | if (node) { | |
1504 | struct channel_state_sample *sample = caa_container_of(node, | |
1505 | struct channel_state_sample, | |
1506 | channel_state_ht_node); | |
1507 | ||
1508 | cds_lfht_del(state->channel_state_ht, node); | |
1509 | free(sample); | |
1510 | } | |
1511 | ||
1512 | /* Remove the channel from the channels_ht and free it. */ | |
1513 | cds_lfht_lookup(state->channels_ht, | |
1514 | hash_channel_key(&key), | |
1515 | match_channel_info, | |
1516 | &key, | |
1517 | &iter); | |
1518 | node = cds_lfht_iter_get_node(&iter); | |
1519 | assert(node); | |
1520 | channel_info = caa_container_of(node, struct channel_info, | |
1521 | channels_ht_node); | |
1522 | cds_lfht_del(state->channels_ht, node); | |
1523 | channel_info_destroy(channel_info); | |
1524 | end: | |
1525 | rcu_read_unlock(); | |
1526 | *cmd_result = LTTNG_OK; | |
1527 | return 0; | |
1528 | } | |
1529 | ||
0ca52944 JG |
1530 | static |
1531 | int handle_notification_thread_command_session_rotation_ongoing( | |
1532 | struct notification_thread_state *state, | |
1533 | const char *session_name, uint64_t trace_archive_chunk_id, | |
1534 | enum lttng_error_code *cmd_result) | |
1535 | { | |
1536 | *cmd_result = LTTNG_OK; | |
1537 | return 0; | |
1538 | } | |
1539 | ||
1540 | static | |
1541 | int handle_notification_thread_command_session_rotation_completed( | |
1542 | struct notification_thread_state *state, | |
1543 | const char *session_name, uint64_t trace_archive_chunk_id, | |
1544 | const struct lttng_trace_archive_location *location, | |
1545 | enum lttng_error_code *cmd_result) | |
1546 | { | |
1547 | *cmd_result = LTTNG_OK; | |
1548 | return 0; | |
1549 | } | |
1550 | ||
1da26331 JG |
1551 | static |
1552 | int condition_is_supported(struct lttng_condition *condition) | |
1553 | { | |
1554 | int ret; | |
1555 | ||
1556 | switch (lttng_condition_get_type(condition)) { | |
1557 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
1558 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
1559 | { | |
1560 | enum lttng_domain_type domain; | |
1561 | ||
1562 | ret = lttng_condition_buffer_usage_get_domain_type(condition, | |
1563 | &domain); | |
1564 | if (ret) { | |
1565 | ret = -1; | |
1566 | goto end; | |
1567 | } | |
1568 | ||
1569 | if (domain != LTTNG_DOMAIN_KERNEL) { | |
1570 | ret = 1; | |
1571 | goto end; | |
1572 | } | |
1573 | ||
1574 | /* | |
1575 | * Older kernel tracers don't expose the API to monitor their | |
1576 | * buffers. Therefore, we reject triggers that require that | |
1577 | * mechanism to be available to be evaluated. | |
1578 | */ | |
1579 | ret = kernel_supports_ring_buffer_snapshot_sample_positions( | |
1580 | kernel_tracer_fd); | |
1581 | break; | |
1582 | } | |
1583 | default: | |
1584 | ret = 1; | |
1585 | } | |
1586 | end: | |
1587 | return ret; | |
1588 | } | |
1589 | ||
51eab943 JG |
1590 | /* Must be called with RCU read lock held. */ |
1591 | static | |
1592 | int bind_trigger_to_matching_session(const struct lttng_trigger *trigger, | |
1593 | struct notification_thread_state *state) | |
1594 | { | |
1595 | int ret = 0; | |
1596 | struct cds_lfht_node *node; | |
1597 | struct cds_lfht_iter iter; | |
1598 | const struct lttng_condition *condition; | |
1599 | const char *session_name; | |
1600 | struct lttng_session_trigger_list *trigger_list; | |
1601 | ||
1602 | condition = lttng_trigger_get_const_condition(trigger); | |
1603 | switch (lttng_condition_get_type(condition)) { | |
1604 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING: | |
1605 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED: | |
1606 | { | |
1607 | enum lttng_condition_status status; | |
1608 | ||
1609 | status = lttng_condition_session_rotation_get_session_name( | |
1610 | condition, &session_name); | |
1611 | if (status != LTTNG_CONDITION_STATUS_OK) { | |
1612 | ERR("[notification-thread] Failed to bind trigger to session: unable to get 'session_rotation' condition's session name"); | |
1613 | ret = -1; | |
1614 | goto end; | |
1615 | } | |
1616 | break; | |
1617 | } | |
1618 | default: | |
1619 | ret = -1; | |
1620 | goto end; | |
1621 | } | |
1622 | ||
1623 | cds_lfht_lookup(state->session_triggers_ht, | |
1624 | hash_key_str(session_name, lttng_ht_seed), | |
1625 | match_session_trigger_list, | |
1626 | session_name, | |
1627 | &iter); | |
1628 | node = cds_lfht_iter_get_node(&iter); | |
1629 | if (!node) { | |
1630 | /* | |
1631 | * Not an error, the list of triggers applying to that session | |
1632 | * will be initialized when the session is created. | |
1633 | */ | |
1634 | DBG("[notification-thread] Unable to bind trigger applying to session \"%s\" as it is not yet known to the notification system", | |
1635 | session_name); | |
1636 | goto end; | |
1637 | } | |
1638 | ||
1639 | trigger_list = caa_container_of(node, | |
1640 | struct lttng_session_trigger_list, | |
1641 | session_triggers_ht_node); | |
1642 | ||
1643 | DBG("[notification-thread] Newly registered trigger bound to session \"%s\"", | |
1644 | session_name); | |
1645 | ret = lttng_session_trigger_list_add(trigger_list, trigger); | |
1646 | end: | |
1647 | return ret; | |
1648 | } | |
1649 | ||
1650 | /* Must be called with RCU read lock held. */ | |
1651 | static | |
1652 | int bind_trigger_to_matching_channels(const struct lttng_trigger *trigger, | |
1653 | struct notification_thread_state *state) | |
1654 | { | |
1655 | int ret = 0; | |
1656 | struct cds_lfht_node *node; | |
1657 | struct cds_lfht_iter iter; | |
1658 | struct channel_info *channel; | |
1659 | ||
1660 | cds_lfht_for_each_entry(state->channels_ht, &iter, channel, | |
1661 | channels_ht_node) { | |
1662 | struct lttng_trigger_list_element *trigger_list_element; | |
1663 | struct lttng_channel_trigger_list *trigger_list; | |
1664 | ||
1665 | if (!trigger_applies_to_channel(trigger, channel)) { | |
1666 | continue; | |
1667 | } | |
1668 | ||
1669 | cds_lfht_lookup(state->channel_triggers_ht, | |
1670 | hash_channel_key(&channel->key), | |
1671 | match_channel_trigger_list, | |
1672 | &channel->key, | |
1673 | &iter); | |
1674 | node = cds_lfht_iter_get_node(&iter); | |
1675 | assert(node); | |
1676 | trigger_list = caa_container_of(node, | |
1677 | struct lttng_channel_trigger_list, | |
1678 | channel_triggers_ht_node); | |
1679 | ||
1680 | trigger_list_element = zmalloc(sizeof(*trigger_list_element)); | |
1681 | if (!trigger_list_element) { | |
1682 | ret = -1; | |
1683 | goto end; | |
1684 | } | |
1685 | CDS_INIT_LIST_HEAD(&trigger_list_element->node); | |
1686 | trigger_list_element->trigger = trigger; | |
1687 | cds_list_add(&trigger_list_element->node, &trigger_list->list); | |
1688 | DBG("[notification-thread] Newly registered trigger bound to channel \"%s\"", | |
1689 | channel->name); | |
1690 | } | |
1691 | end: | |
1692 | return ret; | |
1693 | } | |
1694 | ||
ab0ee2ca JG |
1695 | /* |
1696 | * FIXME A client's credentials are not checked when registering a trigger, nor | |
1697 | * are they stored alongside with the trigger. | |
1698 | * | |
1da26331 | 1699 | * The effects of this are benign since: |
ab0ee2ca | 1700 | * - The client will succeed in registering the trigger, as it is valid, |
51eab943 | 1701 | * - The trigger will, internally, be bound to the channel/session, |
ab0ee2ca JG |
1702 | * - The notifications will not be sent since the client's credentials |
1703 | * are checked against the channel at that moment. | |
1da26331 JG |
1704 | * |
1705 | * If this function returns a non-zero value, it means something is | |
50ca7858 | 1706 | * fundamentally broken and the whole subsystem/thread will be torn down. |
1da26331 JG |
1707 | * |
1708 | * If a non-fatal error occurs, just set the cmd_result to the appropriate | |
1709 | * error code. | |
ab0ee2ca JG |
1710 | */ |
1711 | static | |
1712 | int handle_notification_thread_command_register_trigger( | |
8abe313a JG |
1713 | struct notification_thread_state *state, |
1714 | struct lttng_trigger *trigger, | |
1715 | enum lttng_error_code *cmd_result) | |
ab0ee2ca JG |
1716 | { |
1717 | int ret = 0; | |
1718 | struct lttng_condition *condition; | |
1719 | struct notification_client *client; | |
1720 | struct notification_client_list *client_list = NULL; | |
1721 | struct lttng_trigger_ht_element *trigger_ht_element = NULL; | |
1722 | struct notification_client_list_element *client_list_element, *tmp; | |
1723 | struct cds_lfht_node *node; | |
1724 | struct cds_lfht_iter iter; | |
ab0ee2ca JG |
1725 | bool free_trigger = true; |
1726 | ||
1727 | rcu_read_lock(); | |
1728 | ||
1729 | condition = lttng_trigger_get_condition(trigger); | |
1da26331 JG |
1730 | assert(condition); |
1731 | ||
1732 | ret = condition_is_supported(condition); | |
1733 | if (ret < 0) { | |
1734 | goto error; | |
1735 | } else if (ret == 0) { | |
1736 | *cmd_result = LTTNG_ERR_NOT_SUPPORTED; | |
1737 | goto error; | |
1738 | } else { | |
1739 | /* Feature is supported, continue. */ | |
1740 | ret = 0; | |
1741 | } | |
1742 | ||
ab0ee2ca JG |
1743 | trigger_ht_element = zmalloc(sizeof(*trigger_ht_element)); |
1744 | if (!trigger_ht_element) { | |
1745 | ret = -1; | |
1746 | goto error; | |
1747 | } | |
1748 | ||
1749 | /* Add trigger to the trigger_ht. */ | |
1750 | cds_lfht_node_init(&trigger_ht_element->node); | |
1751 | trigger_ht_element->trigger = trigger; | |
1752 | ||
1753 | node = cds_lfht_add_unique(state->triggers_ht, | |
1754 | lttng_condition_hash(condition), | |
1755 | match_condition, | |
1756 | condition, | |
1757 | &trigger_ht_element->node); | |
1758 | if (node != &trigger_ht_element->node) { | |
1759 | /* Not a fatal error, simply report it to the client. */ | |
1760 | *cmd_result = LTTNG_ERR_TRIGGER_EXISTS; | |
1761 | goto error_free_ht_element; | |
1762 | } | |
1763 | ||
1764 | /* | |
1765 | * Ownership of the trigger and of its wrapper was transfered to | |
1766 | * the triggers_ht. | |
1767 | */ | |
1768 | trigger_ht_element = NULL; | |
1769 | free_trigger = false; | |
1770 | ||
1771 | /* | |
1772 | * The rest only applies to triggers that have a "notify" action. | |
1773 | * It is not skipped as this is the only action type currently | |
1774 | * supported. | |
1775 | */ | |
1776 | client_list = zmalloc(sizeof(*client_list)); | |
1777 | if (!client_list) { | |
1778 | ret = -1; | |
1779 | goto error_free_ht_element; | |
1780 | } | |
1781 | cds_lfht_node_init(&client_list->notification_trigger_ht_node); | |
1782 | CDS_INIT_LIST_HEAD(&client_list->list); | |
1783 | client_list->trigger = trigger; | |
1784 | ||
1785 | /* Build a list of clients to which this new trigger applies. */ | |
1786 | cds_lfht_for_each_entry(state->client_socket_ht, &iter, client, | |
1787 | client_socket_ht_node) { | |
1788 | if (!trigger_applies_to_client(trigger, client)) { | |
1789 | continue; | |
1790 | } | |
1791 | ||
1792 | client_list_element = zmalloc(sizeof(*client_list_element)); | |
1793 | if (!client_list_element) { | |
1794 | ret = -1; | |
1795 | goto error_free_client_list; | |
1796 | } | |
1797 | CDS_INIT_LIST_HEAD(&client_list_element->node); | |
1798 | client_list_element->client = client; | |
1799 | cds_list_add(&client_list_element->node, &client_list->list); | |
1800 | } | |
1801 | ||
1802 | cds_lfht_add(state->notification_trigger_clients_ht, | |
1803 | lttng_condition_hash(condition), | |
1804 | &client_list->notification_trigger_ht_node); | |
ab0ee2ca | 1805 | |
51eab943 JG |
1806 | switch (get_trigger_binding_object(trigger)) { |
1807 | case LTTNG_OBJECT_TYPE_SESSION: | |
1808 | /* Add the trigger to the list if it matches a known session. */ | |
1809 | ret = bind_trigger_to_matching_session(trigger, state); | |
1810 | if (ret) { | |
1811 | goto error_free_client_list; | |
ab0ee2ca | 1812 | } |
51eab943 JG |
1813 | case LTTNG_OBJECT_TYPE_CHANNEL: |
1814 | /* | |
1815 | * Add the trigger to list of triggers bound to the channels | |
1816 | * currently known. | |
1817 | */ | |
1818 | ret = bind_trigger_to_matching_channels(trigger, state); | |
1819 | if (ret) { | |
ab0ee2ca JG |
1820 | goto error_free_client_list; |
1821 | } | |
51eab943 JG |
1822 | break; |
1823 | case LTTNG_OBJECT_TYPE_NONE: | |
1824 | break; | |
1825 | default: | |
1826 | ERR("[notification-thread] Unknown object type on which to bind a newly registered trigger was encountered"); | |
1827 | ret = -1; | |
1828 | goto error_free_client_list; | |
ab0ee2ca JG |
1829 | } |
1830 | ||
2ae99f0b JG |
1831 | /* |
1832 | * Since there is nothing preventing clients from subscribing to a | |
1833 | * condition before the corresponding trigger is registered, we have | |
1834 | * to evaluate this new condition right away. | |
1835 | * | |
1836 | * At some point, we were waiting for the next "evaluation" (e.g. on | |
1837 | * reception of a channel sample) to evaluate this new condition, but | |
1838 | * that was broken. | |
1839 | * | |
1840 | * The reason it was broken is that waiting for the next sample | |
1841 | * does not allow us to properly handle transitions for edge-triggered | |
1842 | * conditions. | |
1843 | * | |
1844 | * Consider this example: when we handle a new channel sample, we | |
1845 | * evaluate each conditions twice: once with the previous state, and | |
1846 | * again with the newest state. We then use those two results to | |
1847 | * determine whether a state change happened: a condition was false and | |
1848 | * became true. If a state change happened, we have to notify clients. | |
1849 | * | |
1850 | * Now, if a client subscribes to a given notification and registers | |
1851 | * a trigger *after* that subscription, we have to make sure the | |
1852 | * condition is evaluated at this point while considering only the | |
1853 | * current state. Otherwise, the next evaluation cycle may only see | |
1854 | * that the evaluations remain the same (true for samples n-1 and n) and | |
1855 | * the client will never know that the condition has been met. | |
1856 | */ | |
1857 | cds_list_for_each_entry_safe(client_list_element, tmp, | |
1858 | &client_list->list, node) { | |
1859 | ret = evaluate_condition_for_client(trigger, condition, | |
1860 | client_list_element->client, state); | |
1861 | if (ret) { | |
1862 | goto error_free_client_list; | |
1863 | } | |
1864 | } | |
1865 | ||
1866 | /* | |
1867 | * Client list ownership transferred to the | |
1868 | * notification_trigger_clients_ht. | |
1869 | */ | |
1870 | client_list = NULL; | |
1871 | ||
ab0ee2ca JG |
1872 | *cmd_result = LTTNG_OK; |
1873 | error_free_client_list: | |
1874 | if (client_list) { | |
1875 | cds_list_for_each_entry_safe(client_list_element, tmp, | |
1876 | &client_list->list, node) { | |
1877 | free(client_list_element); | |
1878 | } | |
1879 | free(client_list); | |
1880 | } | |
1881 | error_free_ht_element: | |
1882 | free(trigger_ht_element); | |
1883 | error: | |
1884 | if (free_trigger) { | |
1885 | struct lttng_action *action = lttng_trigger_get_action(trigger); | |
1886 | ||
1887 | lttng_condition_destroy(condition); | |
1888 | lttng_action_destroy(action); | |
1889 | lttng_trigger_destroy(trigger); | |
1890 | } | |
1891 | rcu_read_unlock(); | |
1892 | return ret; | |
1893 | } | |
1894 | ||
cc2295b5 | 1895 | static |
ab0ee2ca JG |
1896 | int handle_notification_thread_command_unregister_trigger( |
1897 | struct notification_thread_state *state, | |
1898 | struct lttng_trigger *trigger, | |
1899 | enum lttng_error_code *_cmd_reply) | |
1900 | { | |
1901 | struct cds_lfht_iter iter; | |
1902 | struct cds_lfht_node *node, *triggers_ht_node; | |
1903 | struct lttng_channel_trigger_list *trigger_list; | |
1904 | struct notification_client_list *client_list; | |
1905 | struct notification_client_list_element *client_list_element, *tmp; | |
1906 | struct lttng_trigger_ht_element *trigger_ht_element = NULL; | |
1907 | struct lttng_condition *condition = lttng_trigger_get_condition( | |
1908 | trigger); | |
1909 | struct lttng_action *action; | |
1910 | enum lttng_error_code cmd_reply; | |
1911 | ||
1912 | rcu_read_lock(); | |
1913 | ||
1914 | cds_lfht_lookup(state->triggers_ht, | |
1915 | lttng_condition_hash(condition), | |
1916 | match_condition, | |
1917 | condition, | |
1918 | &iter); | |
1919 | triggers_ht_node = cds_lfht_iter_get_node(&iter); | |
1920 | if (!triggers_ht_node) { | |
1921 | cmd_reply = LTTNG_ERR_TRIGGER_NOT_FOUND; | |
1922 | goto end; | |
1923 | } else { | |
1924 | cmd_reply = LTTNG_OK; | |
1925 | } | |
1926 | ||
1927 | /* Remove trigger from channel_triggers_ht. */ | |
1928 | cds_lfht_for_each_entry(state->channel_triggers_ht, &iter, trigger_list, | |
1929 | channel_triggers_ht_node) { | |
1930 | struct lttng_trigger_list_element *trigger_element, *tmp; | |
1931 | ||
1932 | cds_list_for_each_entry_safe(trigger_element, tmp, | |
1933 | &trigger_list->list, node) { | |
9b63a4aa JG |
1934 | const struct lttng_condition *current_condition = |
1935 | lttng_trigger_get_const_condition( | |
ab0ee2ca JG |
1936 | trigger_element->trigger); |
1937 | ||
1938 | assert(current_condition); | |
1939 | if (!lttng_condition_is_equal(condition, | |
1940 | current_condition)) { | |
1941 | continue; | |
1942 | } | |
1943 | ||
1944 | DBG("[notification-thread] Removed trigger from channel_triggers_ht"); | |
1945 | cds_list_del(&trigger_element->node); | |
e4db5ace JR |
1946 | /* A trigger can only appear once per channel */ |
1947 | break; | |
ab0ee2ca JG |
1948 | } |
1949 | } | |
1950 | ||
1951 | /* | |
1952 | * Remove and release the client list from | |
1953 | * notification_trigger_clients_ht. | |
1954 | */ | |
1955 | cds_lfht_lookup(state->notification_trigger_clients_ht, | |
1956 | lttng_condition_hash(condition), | |
1957 | match_client_list, | |
1958 | trigger, | |
1959 | &iter); | |
1960 | node = cds_lfht_iter_get_node(&iter); | |
1961 | assert(node); | |
1962 | client_list = caa_container_of(node, struct notification_client_list, | |
1963 | notification_trigger_ht_node); | |
1964 | cds_list_for_each_entry_safe(client_list_element, tmp, | |
1965 | &client_list->list, node) { | |
1966 | free(client_list_element); | |
1967 | } | |
1968 | cds_lfht_del(state->notification_trigger_clients_ht, node); | |
1969 | free(client_list); | |
1970 | ||
1971 | /* Remove trigger from triggers_ht. */ | |
1972 | trigger_ht_element = caa_container_of(triggers_ht_node, | |
1973 | struct lttng_trigger_ht_element, node); | |
1974 | cds_lfht_del(state->triggers_ht, triggers_ht_node); | |
1975 | ||
1976 | condition = lttng_trigger_get_condition(trigger_ht_element->trigger); | |
1977 | lttng_condition_destroy(condition); | |
1978 | action = lttng_trigger_get_action(trigger_ht_element->trigger); | |
1979 | lttng_action_destroy(action); | |
1980 | lttng_trigger_destroy(trigger_ht_element->trigger); | |
1981 | free(trigger_ht_element); | |
1982 | end: | |
1983 | rcu_read_unlock(); | |
1984 | if (_cmd_reply) { | |
1985 | *_cmd_reply = cmd_reply; | |
1986 | } | |
1987 | return 0; | |
1988 | } | |
1989 | ||
1990 | /* Returns 0 on success, 1 on exit requested, negative value on error. */ | |
1991 | int handle_notification_thread_command( | |
1992 | struct notification_thread_handle *handle, | |
1993 | struct notification_thread_state *state) | |
1994 | { | |
1995 | int ret; | |
1996 | uint64_t counter; | |
1997 | struct notification_thread_command *cmd; | |
1998 | ||
8abe313a JG |
1999 | /* Read the event pipe to put it back into a quiescent state. */ |
2000 | ret = read(lttng_pipe_get_readfd(handle->cmd_queue.event_pipe), &counter, | |
2001 | sizeof(counter)); | |
ab0ee2ca JG |
2002 | if (ret == -1) { |
2003 | goto error; | |
2004 | } | |
2005 | ||
2006 | pthread_mutex_lock(&handle->cmd_queue.lock); | |
2007 | cmd = cds_list_first_entry(&handle->cmd_queue.list, | |
2008 | struct notification_thread_command, cmd_list_node); | |
2009 | switch (cmd->type) { | |
2010 | case NOTIFICATION_COMMAND_TYPE_REGISTER_TRIGGER: | |
2011 | DBG("[notification-thread] Received register trigger command"); | |
2012 | ret = handle_notification_thread_command_register_trigger( | |
2013 | state, cmd->parameters.trigger, | |
2014 | &cmd->reply_code); | |
2015 | break; | |
2016 | case NOTIFICATION_COMMAND_TYPE_UNREGISTER_TRIGGER: | |
2017 | DBG("[notification-thread] Received unregister trigger command"); | |
2018 | ret = handle_notification_thread_command_unregister_trigger( | |
2019 | state, cmd->parameters.trigger, | |
2020 | &cmd->reply_code); | |
2021 | break; | |
2022 | case NOTIFICATION_COMMAND_TYPE_ADD_CHANNEL: | |
2023 | DBG("[notification-thread] Received add channel command"); | |
2024 | ret = handle_notification_thread_command_add_channel( | |
8abe313a JG |
2025 | state, |
2026 | cmd->parameters.add_channel.session.name, | |
2027 | cmd->parameters.add_channel.session.uid, | |
2028 | cmd->parameters.add_channel.session.gid, | |
2029 | cmd->parameters.add_channel.channel.name, | |
2030 | cmd->parameters.add_channel.channel.domain, | |
2031 | cmd->parameters.add_channel.channel.key, | |
2032 | cmd->parameters.add_channel.channel.capacity, | |
ab0ee2ca JG |
2033 | &cmd->reply_code); |
2034 | break; | |
2035 | case NOTIFICATION_COMMAND_TYPE_REMOVE_CHANNEL: | |
2036 | DBG("[notification-thread] Received remove channel command"); | |
2037 | ret = handle_notification_thread_command_remove_channel( | |
2038 | state, cmd->parameters.remove_channel.key, | |
2039 | cmd->parameters.remove_channel.domain, | |
2040 | &cmd->reply_code); | |
2041 | break; | |
0ca52944 JG |
2042 | case NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_ONGOING: |
2043 | DBG("[notification-thread] Received session rotation ongoing command"); | |
2044 | ret = handle_notification_thread_command_session_rotation_ongoing( | |
2045 | state, | |
2046 | cmd->parameters.session_rotation_ongoing.session_name, | |
2047 | cmd->parameters.session_rotation_ongoing.trace_archive_chunk_id, | |
2048 | &cmd->reply_code); | |
2049 | break; | |
2050 | case NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_COMPLETED: | |
2051 | DBG("[notification-thread] Received session rotation completed command"); | |
2052 | ret = handle_notification_thread_command_session_rotation_completed( | |
2053 | state, | |
2054 | cmd->parameters.session_rotation_completed.session_name, | |
2055 | cmd->parameters.session_rotation_completed.trace_archive_chunk_id, | |
2056 | cmd->parameters.session_rotation_completed.location, | |
2057 | &cmd->reply_code); | |
2058 | break; | |
ab0ee2ca JG |
2059 | case NOTIFICATION_COMMAND_TYPE_QUIT: |
2060 | DBG("[notification-thread] Received quit command"); | |
2061 | cmd->reply_code = LTTNG_OK; | |
2062 | ret = 1; | |
2063 | goto end; | |
2064 | default: | |
2065 | ERR("[notification-thread] Unknown internal command received"); | |
2066 | goto error_unlock; | |
2067 | } | |
2068 | ||
2069 | if (ret) { | |
2070 | goto error_unlock; | |
2071 | } | |
2072 | end: | |
2073 | cds_list_del(&cmd->cmd_list_node); | |
8ada111f | 2074 | lttng_waiter_wake_up(&cmd->reply_waiter); |
ab0ee2ca JG |
2075 | pthread_mutex_unlock(&handle->cmd_queue.lock); |
2076 | return ret; | |
2077 | error_unlock: | |
2078 | /* Wake-up and return a fatal error to the calling thread. */ | |
8ada111f | 2079 | lttng_waiter_wake_up(&cmd->reply_waiter); |
ab0ee2ca JG |
2080 | pthread_mutex_unlock(&handle->cmd_queue.lock); |
2081 | cmd->reply_code = LTTNG_ERR_FATAL; | |
2082 | error: | |
2083 | /* Indicate a fatal error to the caller. */ | |
2084 | return -1; | |
2085 | } | |
2086 | ||
2087 | static | |
2088 | unsigned long hash_client_socket(int socket) | |
2089 | { | |
2090 | return hash_key_ulong((void *) (unsigned long) socket, lttng_ht_seed); | |
2091 | } | |
2092 | ||
2093 | static | |
2094 | int socket_set_non_blocking(int socket) | |
2095 | { | |
2096 | int ret, flags; | |
2097 | ||
2098 | /* Set the pipe as non-blocking. */ | |
2099 | ret = fcntl(socket, F_GETFL, 0); | |
2100 | if (ret == -1) { | |
2101 | PERROR("fcntl get socket flags"); | |
2102 | goto end; | |
2103 | } | |
2104 | flags = ret; | |
2105 | ||
2106 | ret = fcntl(socket, F_SETFL, flags | O_NONBLOCK); | |
2107 | if (ret == -1) { | |
2108 | PERROR("fcntl set O_NONBLOCK socket flag"); | |
2109 | goto end; | |
2110 | } | |
2111 | DBG("Client socket (fd = %i) set as non-blocking", socket); | |
2112 | end: | |
2113 | return ret; | |
2114 | } | |
2115 | ||
2116 | static | |
14fa22f8 | 2117 | int client_reset_inbound_state(struct notification_client *client) |
ab0ee2ca JG |
2118 | { |
2119 | int ret; | |
2120 | ||
2121 | ret = lttng_dynamic_buffer_set_size( | |
2122 | &client->communication.inbound.buffer, 0); | |
2123 | assert(!ret); | |
2124 | ||
2125 | client->communication.inbound.bytes_to_receive = | |
2126 | sizeof(struct lttng_notification_channel_message); | |
2127 | client->communication.inbound.msg_type = | |
2128 | LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_UNKNOWN; | |
ab0ee2ca JG |
2129 | LTTNG_SOCK_SET_UID_CRED(&client->communication.inbound.creds, -1); |
2130 | LTTNG_SOCK_SET_GID_CRED(&client->communication.inbound.creds, -1); | |
14fa22f8 JG |
2131 | ret = lttng_dynamic_buffer_set_size( |
2132 | &client->communication.inbound.buffer, | |
2133 | client->communication.inbound.bytes_to_receive); | |
2134 | return ret; | |
ab0ee2ca JG |
2135 | } |
2136 | ||
2137 | int handle_notification_thread_client_connect( | |
2138 | struct notification_thread_state *state) | |
2139 | { | |
2140 | int ret; | |
2141 | struct notification_client *client; | |
2142 | ||
2143 | DBG("[notification-thread] Handling new notification channel client connection"); | |
2144 | ||
2145 | client = zmalloc(sizeof(*client)); | |
2146 | if (!client) { | |
2147 | /* Fatal error. */ | |
2148 | ret = -1; | |
2149 | goto error; | |
2150 | } | |
2151 | CDS_INIT_LIST_HEAD(&client->condition_list); | |
2152 | lttng_dynamic_buffer_init(&client->communication.inbound.buffer); | |
2153 | lttng_dynamic_buffer_init(&client->communication.outbound.buffer); | |
01ea340e | 2154 | client->communication.inbound.expect_creds = true; |
14fa22f8 JG |
2155 | ret = client_reset_inbound_state(client); |
2156 | if (ret) { | |
2157 | ERR("[notification-thread] Failed to reset client communication's inbound state"); | |
2158 | ret = 0; | |
2159 | goto error; | |
2160 | } | |
ab0ee2ca JG |
2161 | |
2162 | ret = lttcomm_accept_unix_sock(state->notification_channel_socket); | |
2163 | if (ret < 0) { | |
2164 | ERR("[notification-thread] Failed to accept new notification channel client connection"); | |
2165 | ret = 0; | |
2166 | goto error; | |
2167 | } | |
2168 | ||
2169 | client->socket = ret; | |
2170 | ||
2171 | ret = socket_set_non_blocking(client->socket); | |
2172 | if (ret) { | |
2173 | ERR("[notification-thread] Failed to set new notification channel client connection socket as non-blocking"); | |
2174 | goto error; | |
2175 | } | |
2176 | ||
2177 | ret = lttcomm_setsockopt_creds_unix_sock(client->socket); | |
2178 | if (ret < 0) { | |
2179 | ERR("[notification-thread] Failed to set socket options on new notification channel client socket"); | |
2180 | ret = 0; | |
2181 | goto error; | |
2182 | } | |
2183 | ||
2184 | ret = lttng_poll_add(&state->events, client->socket, | |
2185 | LPOLLIN | LPOLLERR | | |
2186 | LPOLLHUP | LPOLLRDHUP); | |
2187 | if (ret < 0) { | |
2188 | ERR("[notification-thread] Failed to add notification channel client socket to poll set"); | |
2189 | ret = 0; | |
2190 | goto error; | |
2191 | } | |
2192 | DBG("[notification-thread] Added new notification channel client socket (%i) to poll set", | |
2193 | client->socket); | |
2194 | ||
ab0ee2ca JG |
2195 | rcu_read_lock(); |
2196 | cds_lfht_add(state->client_socket_ht, | |
2197 | hash_client_socket(client->socket), | |
2198 | &client->client_socket_ht_node); | |
2199 | rcu_read_unlock(); | |
2200 | ||
2201 | return ret; | |
2202 | error: | |
2203 | notification_client_destroy(client, state); | |
2204 | return ret; | |
2205 | } | |
2206 | ||
2207 | int handle_notification_thread_client_disconnect( | |
2208 | int client_socket, | |
2209 | struct notification_thread_state *state) | |
2210 | { | |
2211 | int ret = 0; | |
2212 | struct notification_client *client; | |
2213 | ||
2214 | rcu_read_lock(); | |
2215 | DBG("[notification-thread] Closing client connection (socket fd = %i)", | |
2216 | client_socket); | |
2217 | client = get_client_from_socket(client_socket, state); | |
2218 | if (!client) { | |
2219 | /* Internal state corruption, fatal error. */ | |
2220 | ERR("[notification-thread] Unable to find client (socket fd = %i)", | |
2221 | client_socket); | |
2222 | ret = -1; | |
2223 | goto end; | |
2224 | } | |
2225 | ||
2226 | ret = lttng_poll_del(&state->events, client_socket); | |
2227 | if (ret) { | |
2228 | ERR("[notification-thread] Failed to remove client socket from poll set"); | |
2229 | } | |
2230 | cds_lfht_del(state->client_socket_ht, | |
2231 | &client->client_socket_ht_node); | |
2232 | notification_client_destroy(client, state); | |
2233 | end: | |
2234 | rcu_read_unlock(); | |
2235 | return ret; | |
2236 | } | |
2237 | ||
2238 | int handle_notification_thread_client_disconnect_all( | |
2239 | struct notification_thread_state *state) | |
2240 | { | |
2241 | struct cds_lfht_iter iter; | |
2242 | struct notification_client *client; | |
2243 | bool error_encoutered = false; | |
2244 | ||
2245 | rcu_read_lock(); | |
2246 | DBG("[notification-thread] Closing all client connections"); | |
2247 | cds_lfht_for_each_entry(state->client_socket_ht, &iter, client, | |
2248 | client_socket_ht_node) { | |
2249 | int ret; | |
2250 | ||
2251 | ret = handle_notification_thread_client_disconnect( | |
2252 | client->socket, state); | |
2253 | if (ret) { | |
2254 | error_encoutered = true; | |
2255 | } | |
2256 | } | |
2257 | rcu_read_unlock(); | |
2258 | return error_encoutered ? 1 : 0; | |
2259 | } | |
2260 | ||
2261 | int handle_notification_thread_trigger_unregister_all( | |
2262 | struct notification_thread_state *state) | |
2263 | { | |
4149ace8 | 2264 | bool error_occurred = false; |
ab0ee2ca JG |
2265 | struct cds_lfht_iter iter; |
2266 | struct lttng_trigger_ht_element *trigger_ht_element; | |
2267 | ||
2268 | cds_lfht_for_each_entry(state->triggers_ht, &iter, trigger_ht_element, | |
2269 | node) { | |
2270 | int ret = handle_notification_thread_command_unregister_trigger( | |
2271 | state, trigger_ht_element->trigger, NULL); | |
2272 | if (ret) { | |
4149ace8 | 2273 | error_occurred = true; |
ab0ee2ca JG |
2274 | } |
2275 | } | |
4149ace8 | 2276 | return error_occurred ? -1 : 0; |
ab0ee2ca JG |
2277 | } |
2278 | ||
2279 | static | |
2280 | int client_flush_outgoing_queue(struct notification_client *client, | |
2281 | struct notification_thread_state *state) | |
2282 | { | |
2283 | ssize_t ret; | |
2284 | size_t to_send_count; | |
2285 | ||
2286 | assert(client->communication.outbound.buffer.size != 0); | |
2287 | to_send_count = client->communication.outbound.buffer.size; | |
2288 | DBG("[notification-thread] Flushing client (socket fd = %i) outgoing queue", | |
2289 | client->socket); | |
2290 | ||
2291 | ret = lttcomm_send_unix_sock_non_block(client->socket, | |
2292 | client->communication.outbound.buffer.data, | |
2293 | to_send_count); | |
2294 | if ((ret < 0 && (errno == EAGAIN || errno == EWOULDBLOCK)) || | |
2295 | (ret > 0 && ret < to_send_count)) { | |
2296 | DBG("[notification-thread] Client (socket fd = %i) outgoing queue could not be completely flushed", | |
2297 | client->socket); | |
2298 | to_send_count -= max(ret, 0); | |
2299 | ||
2300 | memcpy(client->communication.outbound.buffer.data, | |
2301 | client->communication.outbound.buffer.data + | |
2302 | client->communication.outbound.buffer.size - to_send_count, | |
2303 | to_send_count); | |
2304 | ret = lttng_dynamic_buffer_set_size( | |
2305 | &client->communication.outbound.buffer, | |
2306 | to_send_count); | |
2307 | if (ret) { | |
2308 | goto error; | |
2309 | } | |
2310 | ||
2311 | /* | |
2312 | * We want to be notified whenever there is buffer space | |
2313 | * available to send the rest of the payload. | |
2314 | */ | |
2315 | ret = lttng_poll_mod(&state->events, client->socket, | |
2316 | CLIENT_POLL_MASK_IN_OUT); | |
2317 | if (ret) { | |
2318 | goto error; | |
2319 | } | |
2320 | } else if (ret < 0) { | |
2321 | /* Generic error, disconnect the client. */ | |
2322 | ERR("[notification-thread] Failed to send flush outgoing queue, disconnecting client (socket fd = %i)", | |
2323 | client->socket); | |
2324 | ret = handle_notification_thread_client_disconnect( | |
2325 | client->socket, state); | |
2326 | if (ret) { | |
2327 | goto error; | |
2328 | } | |
2329 | } else { | |
2330 | /* No error and flushed the queue completely. */ | |
2331 | ret = lttng_dynamic_buffer_set_size( | |
2332 | &client->communication.outbound.buffer, 0); | |
2333 | if (ret) { | |
2334 | goto error; | |
2335 | } | |
2336 | ret = lttng_poll_mod(&state->events, client->socket, | |
2337 | CLIENT_POLL_MASK_IN); | |
2338 | if (ret) { | |
2339 | goto error; | |
2340 | } | |
2341 | ||
2342 | client->communication.outbound.queued_command_reply = false; | |
2343 | client->communication.outbound.dropped_notification = false; | |
2344 | } | |
2345 | ||
2346 | return 0; | |
2347 | error: | |
2348 | return -1; | |
2349 | } | |
2350 | ||
2351 | static | |
2352 | int client_send_command_reply(struct notification_client *client, | |
2353 | struct notification_thread_state *state, | |
2354 | enum lttng_notification_channel_status status) | |
2355 | { | |
2356 | int ret; | |
2357 | struct lttng_notification_channel_command_reply reply = { | |
2358 | .status = (int8_t) status, | |
2359 | }; | |
2360 | struct lttng_notification_channel_message msg = { | |
2361 | .type = (int8_t) LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_COMMAND_REPLY, | |
2362 | .size = sizeof(reply), | |
2363 | }; | |
2364 | char buffer[sizeof(msg) + sizeof(reply)]; | |
2365 | ||
2366 | if (client->communication.outbound.queued_command_reply) { | |
2367 | /* Protocol error. */ | |
2368 | goto error; | |
2369 | } | |
2370 | ||
2371 | memcpy(buffer, &msg, sizeof(msg)); | |
2372 | memcpy(buffer + sizeof(msg), &reply, sizeof(reply)); | |
2373 | DBG("[notification-thread] Send command reply (%i)", (int) status); | |
2374 | ||
2375 | /* Enqueue buffer to outgoing queue and flush it. */ | |
2376 | ret = lttng_dynamic_buffer_append( | |
2377 | &client->communication.outbound.buffer, | |
2378 | buffer, sizeof(buffer)); | |
2379 | if (ret) { | |
2380 | goto error; | |
2381 | } | |
2382 | ||
2383 | ret = client_flush_outgoing_queue(client, state); | |
2384 | if (ret) { | |
2385 | goto error; | |
2386 | } | |
2387 | ||
2388 | if (client->communication.outbound.buffer.size != 0) { | |
2389 | /* Queue could not be emptied. */ | |
2390 | client->communication.outbound.queued_command_reply = true; | |
2391 | } | |
2392 | ||
2393 | return 0; | |
2394 | error: | |
2395 | return -1; | |
2396 | } | |
2397 | ||
2398 | static | |
2399 | int client_dispatch_message(struct notification_client *client, | |
2400 | struct notification_thread_state *state) | |
2401 | { | |
2402 | int ret = 0; | |
2403 | ||
2404 | if (client->communication.inbound.msg_type != | |
2405 | LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_HANDSHAKE && | |
2406 | client->communication.inbound.msg_type != | |
2407 | LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_UNKNOWN && | |
2408 | !client->validated) { | |
2409 | WARN("[notification-thread] client attempted a command before handshake"); | |
2410 | ret = -1; | |
2411 | goto end; | |
2412 | } | |
2413 | ||
2414 | switch (client->communication.inbound.msg_type) { | |
2415 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_UNKNOWN: | |
2416 | { | |
2417 | /* | |
2418 | * Receiving message header. The function will be called again | |
2419 | * once the rest of the message as been received and can be | |
2420 | * interpreted. | |
2421 | */ | |
2422 | const struct lttng_notification_channel_message *msg; | |
2423 | ||
2424 | assert(sizeof(*msg) == | |
2425 | client->communication.inbound.buffer.size); | |
2426 | msg = (const struct lttng_notification_channel_message *) | |
2427 | client->communication.inbound.buffer.data; | |
2428 | ||
2429 | if (msg->size == 0 || msg->size > DEFAULT_MAX_NOTIFICATION_CLIENT_MESSAGE_PAYLOAD_SIZE) { | |
2430 | ERR("[notification-thread] Invalid notification channel message: length = %u", msg->size); | |
2431 | ret = -1; | |
2432 | goto end; | |
2433 | } | |
2434 | ||
2435 | switch (msg->type) { | |
2436 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_SUBSCRIBE: | |
2437 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_UNSUBSCRIBE: | |
2438 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_HANDSHAKE: | |
2439 | break; | |
2440 | default: | |
2441 | ret = -1; | |
2442 | ERR("[notification-thread] Invalid notification channel message: unexpected message type"); | |
2443 | goto end; | |
2444 | } | |
2445 | ||
2446 | client->communication.inbound.bytes_to_receive = msg->size; | |
2447 | client->communication.inbound.msg_type = | |
2448 | (enum lttng_notification_channel_message_type) msg->type; | |
ab0ee2ca | 2449 | ret = lttng_dynamic_buffer_set_size( |
14fa22f8 | 2450 | &client->communication.inbound.buffer, msg->size); |
ab0ee2ca JG |
2451 | if (ret) { |
2452 | goto end; | |
2453 | } | |
2454 | break; | |
2455 | } | |
2456 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_HANDSHAKE: | |
2457 | { | |
2458 | struct lttng_notification_channel_command_handshake *handshake_client; | |
2459 | struct lttng_notification_channel_command_handshake handshake_reply = { | |
2460 | .major = LTTNG_NOTIFICATION_CHANNEL_VERSION_MAJOR, | |
2461 | .minor = LTTNG_NOTIFICATION_CHANNEL_VERSION_MINOR, | |
2462 | }; | |
2463 | struct lttng_notification_channel_message msg_header = { | |
2464 | .type = LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_HANDSHAKE, | |
2465 | .size = sizeof(handshake_reply), | |
2466 | }; | |
2467 | enum lttng_notification_channel_status status = | |
2468 | LTTNG_NOTIFICATION_CHANNEL_STATUS_OK; | |
2469 | char send_buffer[sizeof(msg_header) + sizeof(handshake_reply)]; | |
2470 | ||
2471 | memcpy(send_buffer, &msg_header, sizeof(msg_header)); | |
2472 | memcpy(send_buffer + sizeof(msg_header), &handshake_reply, | |
2473 | sizeof(handshake_reply)); | |
2474 | ||
2475 | handshake_client = | |
2476 | (struct lttng_notification_channel_command_handshake *) | |
2477 | client->communication.inbound.buffer.data; | |
47a32869 | 2478 | client->major = handshake_client->major; |
ab0ee2ca JG |
2479 | client->minor = handshake_client->minor; |
2480 | if (!client->communication.inbound.creds_received) { | |
2481 | ERR("[notification-thread] No credentials received from client"); | |
2482 | ret = -1; | |
2483 | goto end; | |
2484 | } | |
2485 | ||
2486 | client->uid = LTTNG_SOCK_GET_UID_CRED( | |
2487 | &client->communication.inbound.creds); | |
2488 | client->gid = LTTNG_SOCK_GET_GID_CRED( | |
2489 | &client->communication.inbound.creds); | |
2490 | DBG("[notification-thread] Received handshake from client (uid = %u, gid = %u) with version %i.%i", | |
2491 | client->uid, client->gid, (int) client->major, | |
2492 | (int) client->minor); | |
2493 | ||
2494 | if (handshake_client->major != LTTNG_NOTIFICATION_CHANNEL_VERSION_MAJOR) { | |
2495 | status = LTTNG_NOTIFICATION_CHANNEL_STATUS_UNSUPPORTED_VERSION; | |
2496 | } | |
2497 | ||
2498 | ret = lttng_dynamic_buffer_append(&client->communication.outbound.buffer, | |
2499 | send_buffer, sizeof(send_buffer)); | |
2500 | if (ret) { | |
2501 | ERR("[notification-thread] Failed to send protocol version to notification channel client"); | |
2502 | goto end; | |
2503 | } | |
2504 | ||
2505 | ret = client_flush_outgoing_queue(client, state); | |
2506 | if (ret) { | |
2507 | goto end; | |
2508 | } | |
2509 | ||
2510 | ret = client_send_command_reply(client, state, status); | |
2511 | if (ret) { | |
2512 | ERR("[notification-thread] Failed to send reply to notification channel client"); | |
2513 | goto end; | |
2514 | } | |
2515 | ||
2516 | /* Set reception state to receive the next message header. */ | |
14fa22f8 JG |
2517 | ret = client_reset_inbound_state(client); |
2518 | if (ret) { | |
2519 | ERR("[notification-thread] Failed to reset client communication's inbound state"); | |
2520 | goto end; | |
2521 | } | |
ab0ee2ca JG |
2522 | client->validated = true; |
2523 | break; | |
2524 | } | |
2525 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_SUBSCRIBE: | |
2526 | case LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_UNSUBSCRIBE: | |
2527 | { | |
2528 | struct lttng_condition *condition; | |
2529 | enum lttng_notification_channel_status status = | |
2530 | LTTNG_NOTIFICATION_CHANNEL_STATUS_OK; | |
2531 | const struct lttng_buffer_view condition_view = | |
2532 | lttng_buffer_view_from_dynamic_buffer( | |
2533 | &client->communication.inbound.buffer, | |
2534 | 0, -1); | |
2535 | size_t expected_condition_size = | |
2536 | client->communication.inbound.buffer.size; | |
2537 | ||
2538 | ret = lttng_condition_create_from_buffer(&condition_view, | |
2539 | &condition); | |
2540 | if (ret != expected_condition_size) { | |
2541 | ERR("[notification-thread] Malformed condition received from client"); | |
2542 | goto end; | |
2543 | } | |
2544 | ||
2545 | if (client->communication.inbound.msg_type == | |
2546 | LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_SUBSCRIBE) { | |
ab0ee2ca JG |
2547 | ret = notification_thread_client_subscribe(client, |
2548 | condition, state, &status); | |
2549 | } else { | |
2550 | ret = notification_thread_client_unsubscribe(client, | |
2551 | condition, state, &status); | |
2552 | } | |
2553 | if (ret) { | |
2554 | goto end; | |
2555 | } | |
2556 | ||
2557 | ret = client_send_command_reply(client, state, status); | |
2558 | if (ret) { | |
2559 | ERR("[notification-thread] Failed to send reply to notification channel client"); | |
2560 | goto end; | |
2561 | } | |
2562 | ||
2563 | /* Set reception state to receive the next message header. */ | |
14fa22f8 JG |
2564 | ret = client_reset_inbound_state(client); |
2565 | if (ret) { | |
2566 | ERR("[notification-thread] Failed to reset client communication's inbound state"); | |
2567 | goto end; | |
2568 | } | |
ab0ee2ca JG |
2569 | break; |
2570 | } | |
2571 | default: | |
2572 | abort(); | |
2573 | } | |
2574 | end: | |
2575 | return ret; | |
2576 | } | |
2577 | ||
2578 | /* Incoming data from client. */ | |
2579 | int handle_notification_thread_client_in( | |
2580 | struct notification_thread_state *state, int socket) | |
2581 | { | |
14fa22f8 | 2582 | int ret = 0; |
ab0ee2ca JG |
2583 | struct notification_client *client; |
2584 | ssize_t recv_ret; | |
2585 | size_t offset; | |
2586 | ||
2587 | client = get_client_from_socket(socket, state); | |
2588 | if (!client) { | |
2589 | /* Internal error, abort. */ | |
2590 | ret = -1; | |
2591 | goto end; | |
2592 | } | |
2593 | ||
14fa22f8 JG |
2594 | offset = client->communication.inbound.buffer.size - |
2595 | client->communication.inbound.bytes_to_receive; | |
01ea340e | 2596 | if (client->communication.inbound.expect_creds) { |
ab0ee2ca JG |
2597 | recv_ret = lttcomm_recv_creds_unix_sock(socket, |
2598 | client->communication.inbound.buffer.data + offset, | |
2599 | client->communication.inbound.bytes_to_receive, | |
2600 | &client->communication.inbound.creds); | |
2601 | if (recv_ret > 0) { | |
01ea340e | 2602 | client->communication.inbound.expect_creds = false; |
ab0ee2ca JG |
2603 | client->communication.inbound.creds_received = true; |
2604 | } | |
2605 | } else { | |
2606 | recv_ret = lttcomm_recv_unix_sock_non_block(socket, | |
2607 | client->communication.inbound.buffer.data + offset, | |
2608 | client->communication.inbound.bytes_to_receive); | |
2609 | } | |
2610 | if (recv_ret < 0) { | |
2611 | goto error_disconnect_client; | |
2612 | } | |
2613 | ||
2614 | client->communication.inbound.bytes_to_receive -= recv_ret; | |
ab0ee2ca JG |
2615 | if (client->communication.inbound.bytes_to_receive == 0) { |
2616 | ret = client_dispatch_message(client, state); | |
2617 | if (ret) { | |
2618 | /* | |
2619 | * Only returns an error if this client must be | |
2620 | * disconnected. | |
2621 | */ | |
2622 | goto error_disconnect_client; | |
2623 | } | |
2624 | } else { | |
2625 | goto end; | |
2626 | } | |
2627 | end: | |
2628 | return ret; | |
2629 | error_disconnect_client: | |
2630 | ret = handle_notification_thread_client_disconnect(socket, state); | |
2631 | return ret; | |
2632 | } | |
2633 | ||
2634 | /* Client ready to receive outgoing data. */ | |
2635 | int handle_notification_thread_client_out( | |
2636 | struct notification_thread_state *state, int socket) | |
2637 | { | |
2638 | int ret; | |
2639 | struct notification_client *client; | |
2640 | ||
2641 | client = get_client_from_socket(socket, state); | |
2642 | if (!client) { | |
2643 | /* Internal error, abort. */ | |
2644 | ret = -1; | |
2645 | goto end; | |
2646 | } | |
2647 | ||
2648 | ret = client_flush_outgoing_queue(client, state); | |
2649 | if (ret) { | |
2650 | goto end; | |
2651 | } | |
2652 | end: | |
2653 | return ret; | |
2654 | } | |
2655 | ||
2656 | static | |
e8360425 JD |
2657 | bool evaluate_buffer_usage_condition(const struct lttng_condition *condition, |
2658 | const struct channel_state_sample *sample, | |
2659 | uint64_t buffer_capacity) | |
ab0ee2ca JG |
2660 | { |
2661 | bool result = false; | |
2662 | uint64_t threshold; | |
2663 | enum lttng_condition_type condition_type; | |
e8360425 | 2664 | const struct lttng_condition_buffer_usage *use_condition = container_of( |
ab0ee2ca JG |
2665 | condition, struct lttng_condition_buffer_usage, |
2666 | parent); | |
2667 | ||
ab0ee2ca JG |
2668 | if (use_condition->threshold_bytes.set) { |
2669 | threshold = use_condition->threshold_bytes.value; | |
2670 | } else { | |
2671 | /* | |
2672 | * Threshold was expressed as a ratio. | |
2673 | * | |
2674 | * TODO the threshold (in bytes) of conditions expressed | |
2675 | * as a ratio of total buffer size could be cached to | |
2676 | * forego this double-multiplication or it could be performed | |
2677 | * as fixed-point math. | |
2678 | * | |
2679 | * Note that caching should accomodate the case where the | |
2680 | * condition applies to multiple channels (i.e. don't assume | |
2681 | * that all channels matching my_chann* have the same size...) | |
2682 | */ | |
2683 | threshold = (uint64_t) (use_condition->threshold_ratio.value * | |
2684 | (double) buffer_capacity); | |
2685 | } | |
2686 | ||
2687 | condition_type = lttng_condition_get_type(condition); | |
2688 | if (condition_type == LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW) { | |
2689 | DBG("[notification-thread] Low buffer usage condition being evaluated: threshold = %" PRIu64 ", highest usage = %" PRIu64, | |
2690 | threshold, sample->highest_usage); | |
2691 | ||
2692 | /* | |
2693 | * The low condition should only be triggered once _all_ of the | |
2694 | * streams in a channel have gone below the "low" threshold. | |
2695 | */ | |
2696 | if (sample->highest_usage <= threshold) { | |
2697 | result = true; | |
2698 | } | |
2699 | } else { | |
2700 | DBG("[notification-thread] High buffer usage condition being evaluated: threshold = %" PRIu64 ", highest usage = %" PRIu64, | |
2701 | threshold, sample->highest_usage); | |
2702 | ||
2703 | /* | |
2704 | * For high buffer usage scenarios, we want to trigger whenever | |
2705 | * _any_ of the streams has reached the "high" threshold. | |
2706 | */ | |
2707 | if (sample->highest_usage >= threshold) { | |
2708 | result = true; | |
2709 | } | |
2710 | } | |
e8360425 | 2711 | |
ab0ee2ca JG |
2712 | return result; |
2713 | } | |
2714 | ||
2715 | static | |
e8360425 JD |
2716 | bool evaluate_session_consumed_size_condition( |
2717 | const struct lttng_condition *condition, | |
2718 | uint64_t session_consumed_size) | |
2719 | { | |
2720 | uint64_t threshold; | |
2721 | const struct lttng_condition_session_consumed_size *size_condition = | |
2722 | container_of(condition, | |
2723 | struct lttng_condition_session_consumed_size, | |
2724 | parent); | |
2725 | ||
2726 | threshold = size_condition->consumed_threshold_bytes.value; | |
2727 | DBG("[notification-thread] Session consumed size condition being evaluated: threshold = %" PRIu64 ", current size = %" PRIu64, | |
2728 | threshold, session_consumed_size); | |
2729 | return session_consumed_size >= threshold; | |
2730 | } | |
2731 | ||
2732 | static | |
2733 | int evaluate_condition(const struct lttng_condition *condition, | |
ab0ee2ca | 2734 | struct lttng_evaluation **evaluation, |
e8360425 JD |
2735 | const struct notification_thread_state *state, |
2736 | const struct channel_state_sample *previous_sample, | |
2737 | const struct channel_state_sample *latest_sample, | |
2738 | uint64_t previous_session_consumed_total, | |
2739 | uint64_t latest_session_consumed_total, | |
2740 | struct channel_info *channel_info) | |
ab0ee2ca JG |
2741 | { |
2742 | int ret = 0; | |
2743 | enum lttng_condition_type condition_type; | |
e8360425 JD |
2744 | const bool previous_sample_available = !!previous_sample; |
2745 | bool previous_sample_result = false; | |
ab0ee2ca JG |
2746 | bool latest_sample_result; |
2747 | ||
2748 | condition_type = lttng_condition_get_type(condition); | |
ab0ee2ca | 2749 | |
e8360425 JD |
2750 | switch (condition_type) { |
2751 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
2752 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
2753 | if (caa_likely(previous_sample_available)) { | |
2754 | previous_sample_result = | |
2755 | evaluate_buffer_usage_condition(condition, | |
2756 | previous_sample, channel_info->capacity); | |
2757 | } | |
2758 | latest_sample_result = evaluate_buffer_usage_condition( | |
2759 | condition, latest_sample, | |
2760 | channel_info->capacity); | |
2761 | break; | |
2762 | case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE: | |
2763 | if (caa_likely(previous_sample_available)) { | |
2764 | previous_sample_result = | |
2765 | evaluate_session_consumed_size_condition( | |
2766 | condition, | |
2767 | previous_session_consumed_total); | |
2768 | } | |
2769 | latest_sample_result = | |
2770 | evaluate_session_consumed_size_condition( | |
2771 | condition, | |
2772 | latest_session_consumed_total); | |
2773 | break; | |
2774 | default: | |
2775 | /* Unknown condition type; internal error. */ | |
2776 | abort(); | |
2777 | } | |
ab0ee2ca JG |
2778 | |
2779 | if (!latest_sample_result || | |
2780 | (previous_sample_result == latest_sample_result)) { | |
2781 | /* | |
2782 | * Only trigger on a condition evaluation transition. | |
2783 | * | |
2784 | * NOTE: This edge-triggered logic may not be appropriate for | |
2785 | * future condition types. | |
2786 | */ | |
2787 | goto end; | |
2788 | } | |
2789 | ||
e8360425 JD |
2790 | if (!evaluation || !latest_sample_result) { |
2791 | goto end; | |
2792 | } | |
2793 | ||
2794 | switch (condition_type) { | |
2795 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
2796 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
ab0ee2ca JG |
2797 | *evaluation = lttng_evaluation_buffer_usage_create( |
2798 | condition_type, | |
2799 | latest_sample->highest_usage, | |
e8360425 JD |
2800 | channel_info->capacity); |
2801 | break; | |
2802 | case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE: | |
2803 | *evaluation = lttng_evaluation_session_consumed_size_create( | |
e8360425 JD |
2804 | latest_session_consumed_total); |
2805 | break; | |
2806 | default: | |
2807 | abort(); | |
2808 | } | |
2809 | ||
2810 | if (!*evaluation) { | |
2811 | ret = -1; | |
2812 | goto end; | |
ab0ee2ca JG |
2813 | } |
2814 | end: | |
2815 | return ret; | |
2816 | } | |
2817 | ||
2818 | static | |
2819 | int client_enqueue_dropped_notification(struct notification_client *client, | |
2820 | struct notification_thread_state *state) | |
2821 | { | |
2822 | int ret; | |
2823 | struct lttng_notification_channel_message msg = { | |
2824 | .type = (int8_t) LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_NOTIFICATION_DROPPED, | |
2825 | .size = 0, | |
2826 | }; | |
2827 | ||
2828 | ret = lttng_dynamic_buffer_append( | |
2829 | &client->communication.outbound.buffer, &msg, | |
2830 | sizeof(msg)); | |
2831 | return ret; | |
2832 | } | |
2833 | ||
2834 | static | |
9b63a4aa JG |
2835 | int send_evaluation_to_clients(const struct lttng_trigger *trigger, |
2836 | const struct lttng_evaluation *evaluation, | |
ab0ee2ca JG |
2837 | struct notification_client_list* client_list, |
2838 | struct notification_thread_state *state, | |
2839 | uid_t channel_uid, gid_t channel_gid) | |
2840 | { | |
2841 | int ret = 0; | |
2842 | struct lttng_dynamic_buffer msg_buffer; | |
2843 | struct notification_client_list_element *client_list_element, *tmp; | |
9b63a4aa JG |
2844 | const struct lttng_notification notification = { |
2845 | .condition = (struct lttng_condition *) lttng_trigger_get_const_condition(trigger), | |
2846 | .evaluation = (struct lttng_evaluation *) evaluation, | |
2847 | }; | |
3647288f JG |
2848 | struct lttng_notification_channel_message msg_header = { |
2849 | .type = (int8_t) LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_NOTIFICATION, | |
2850 | }; | |
ab0ee2ca JG |
2851 | |
2852 | lttng_dynamic_buffer_init(&msg_buffer); | |
2853 | ||
3647288f JG |
2854 | ret = lttng_dynamic_buffer_append(&msg_buffer, &msg_header, |
2855 | sizeof(msg_header)); | |
ab0ee2ca JG |
2856 | if (ret) { |
2857 | goto end; | |
2858 | } | |
2859 | ||
9b63a4aa | 2860 | ret = lttng_notification_serialize(¬ification, &msg_buffer); |
ab0ee2ca | 2861 | if (ret) { |
ab0ee2ca JG |
2862 | ERR("[notification-thread] Failed to serialize notification"); |
2863 | ret = -1; | |
2864 | goto end; | |
2865 | } | |
2866 | ||
3647288f JG |
2867 | /* Update payload size. */ |
2868 | ((struct lttng_notification_channel_message * ) msg_buffer.data)->size = | |
2869 | (uint32_t) (msg_buffer.size - sizeof(msg_header)); | |
2870 | ||
ab0ee2ca JG |
2871 | cds_list_for_each_entry_safe(client_list_element, tmp, |
2872 | &client_list->list, node) { | |
2873 | struct notification_client *client = | |
2874 | client_list_element->client; | |
2875 | ||
2876 | if (client->uid != channel_uid && client->gid != channel_gid && | |
2877 | client->uid != 0) { | |
2878 | /* Client is not allowed to monitor this channel. */ | |
2879 | DBG("[notification-thread] Skipping client at it does not have the permission to receive notification for this channel"); | |
2880 | continue; | |
2881 | } | |
2882 | ||
2883 | DBG("[notification-thread] Sending notification to client (fd = %i, %zu bytes)", | |
2884 | client->socket, msg_buffer.size); | |
2885 | if (client->communication.outbound.buffer.size) { | |
2886 | /* | |
2887 | * Outgoing data is already buffered for this client; | |
2888 | * drop the notification and enqueue a "dropped | |
2889 | * notification" message if this is the first dropped | |
2890 | * notification since the socket spilled-over to the | |
2891 | * queue. | |
2892 | */ | |
2893 | DBG("[notification-thread] Dropping notification addressed to client (socket fd = %i)", | |
2894 | client->socket); | |
2895 | if (!client->communication.outbound.dropped_notification) { | |
2896 | client->communication.outbound.dropped_notification = true; | |
2897 | ret = client_enqueue_dropped_notification( | |
2898 | client, state); | |
2899 | if (ret) { | |
2900 | goto end; | |
2901 | } | |
2902 | } | |
2903 | continue; | |
2904 | } | |
2905 | ||
2906 | ret = lttng_dynamic_buffer_append_buffer( | |
2907 | &client->communication.outbound.buffer, | |
2908 | &msg_buffer); | |
2909 | if (ret) { | |
2910 | goto end; | |
2911 | } | |
2912 | ||
2913 | ret = client_flush_outgoing_queue(client, state); | |
2914 | if (ret) { | |
2915 | goto end; | |
2916 | } | |
2917 | } | |
2918 | ret = 0; | |
2919 | end: | |
ab0ee2ca JG |
2920 | lttng_dynamic_buffer_reset(&msg_buffer); |
2921 | return ret; | |
2922 | } | |
2923 | ||
2924 | int handle_notification_thread_channel_sample( | |
2925 | struct notification_thread_state *state, int pipe, | |
2926 | enum lttng_domain_type domain) | |
2927 | { | |
2928 | int ret = 0; | |
2929 | struct lttcomm_consumer_channel_monitor_msg sample_msg; | |
ab0ee2ca JG |
2930 | struct channel_info *channel_info; |
2931 | struct cds_lfht_node *node; | |
2932 | struct cds_lfht_iter iter; | |
2933 | struct lttng_channel_trigger_list *trigger_list; | |
2934 | struct lttng_trigger_list_element *trigger_list_element; | |
2935 | bool previous_sample_available = false; | |
e8360425 JD |
2936 | struct channel_state_sample previous_sample, latest_sample; |
2937 | uint64_t previous_session_consumed_total, latest_session_consumed_total; | |
ab0ee2ca JG |
2938 | |
2939 | /* | |
2940 | * The monitoring pipe only holds messages smaller than PIPE_BUF, | |
2941 | * ensuring that read/write of sampling messages are atomic. | |
2942 | */ | |
7c2551ef | 2943 | ret = lttng_read(pipe, &sample_msg, sizeof(sample_msg)); |
ab0ee2ca JG |
2944 | if (ret != sizeof(sample_msg)) { |
2945 | ERR("[notification-thread] Failed to read from monitoring pipe (fd = %i)", | |
2946 | pipe); | |
2947 | ret = -1; | |
2948 | goto end; | |
2949 | } | |
2950 | ||
2951 | ret = 0; | |
2952 | latest_sample.key.key = sample_msg.key; | |
2953 | latest_sample.key.domain = domain; | |
2954 | latest_sample.highest_usage = sample_msg.highest; | |
2955 | latest_sample.lowest_usage = sample_msg.lowest; | |
e8360425 | 2956 | latest_sample.channel_total_consumed = sample_msg.total_consumed; |
ab0ee2ca JG |
2957 | |
2958 | rcu_read_lock(); | |
2959 | ||
2960 | /* Retrieve the channel's informations */ | |
2961 | cds_lfht_lookup(state->channels_ht, | |
2962 | hash_channel_key(&latest_sample.key), | |
2963 | match_channel_info, | |
2964 | &latest_sample.key, | |
2965 | &iter); | |
2966 | node = cds_lfht_iter_get_node(&iter); | |
e0b5f87b | 2967 | if (caa_unlikely(!node)) { |
ab0ee2ca JG |
2968 | /* |
2969 | * Not an error since the consumer can push a sample to the pipe | |
2970 | * and the rest of the session daemon could notify us of the | |
2971 | * channel's destruction before we get a chance to process that | |
2972 | * sample. | |
2973 | */ | |
2974 | DBG("[notification-thread] Received a sample for an unknown channel from consumerd, key = %" PRIu64 " in %s domain", | |
2975 | latest_sample.key.key, | |
2976 | domain == LTTNG_DOMAIN_KERNEL ? "kernel" : | |
2977 | "user space"); | |
2978 | goto end_unlock; | |
2979 | } | |
2980 | channel_info = caa_container_of(node, struct channel_info, | |
2981 | channels_ht_node); | |
e8360425 | 2982 | DBG("[notification-thread] Handling channel sample for channel %s (key = %" PRIu64 ") in session %s (highest usage = %" PRIu64 ", lowest usage = %" PRIu64", total consumed = %" PRIu64")", |
8abe313a | 2983 | channel_info->name, |
ab0ee2ca | 2984 | latest_sample.key.key, |
8abe313a | 2985 | channel_info->session_info->name, |
ab0ee2ca | 2986 | latest_sample.highest_usage, |
e8360425 JD |
2987 | latest_sample.lowest_usage, |
2988 | latest_sample.channel_total_consumed); | |
2989 | ||
2990 | previous_session_consumed_total = | |
2991 | channel_info->session_info->consumed_data_size; | |
ab0ee2ca JG |
2992 | |
2993 | /* Retrieve the channel's last sample, if it exists, and update it. */ | |
2994 | cds_lfht_lookup(state->channel_state_ht, | |
2995 | hash_channel_key(&latest_sample.key), | |
2996 | match_channel_state_sample, | |
2997 | &latest_sample.key, | |
2998 | &iter); | |
2999 | node = cds_lfht_iter_get_node(&iter); | |
e0b5f87b | 3000 | if (caa_likely(node)) { |
ab0ee2ca JG |
3001 | struct channel_state_sample *stored_sample; |
3002 | ||
3003 | /* Update the sample stored. */ | |
3004 | stored_sample = caa_container_of(node, | |
3005 | struct channel_state_sample, | |
3006 | channel_state_ht_node); | |
e8360425 | 3007 | |
ab0ee2ca JG |
3008 | memcpy(&previous_sample, stored_sample, |
3009 | sizeof(previous_sample)); | |
3010 | stored_sample->highest_usage = latest_sample.highest_usage; | |
3011 | stored_sample->lowest_usage = latest_sample.lowest_usage; | |
0f0479d7 | 3012 | stored_sample->channel_total_consumed = latest_sample.channel_total_consumed; |
ab0ee2ca | 3013 | previous_sample_available = true; |
e8360425 JD |
3014 | |
3015 | latest_session_consumed_total = | |
3016 | previous_session_consumed_total + | |
3017 | (latest_sample.channel_total_consumed - previous_sample.channel_total_consumed); | |
ab0ee2ca JG |
3018 | } else { |
3019 | /* | |
3020 | * This is the channel's first sample, allocate space for and | |
3021 | * store the new sample. | |
3022 | */ | |
3023 | struct channel_state_sample *stored_sample; | |
3024 | ||
3025 | stored_sample = zmalloc(sizeof(*stored_sample)); | |
3026 | if (!stored_sample) { | |
3027 | ret = -1; | |
3028 | goto end_unlock; | |
3029 | } | |
3030 | ||
3031 | memcpy(stored_sample, &latest_sample, sizeof(*stored_sample)); | |
3032 | cds_lfht_node_init(&stored_sample->channel_state_ht_node); | |
3033 | cds_lfht_add(state->channel_state_ht, | |
3034 | hash_channel_key(&stored_sample->key), | |
3035 | &stored_sample->channel_state_ht_node); | |
e8360425 JD |
3036 | |
3037 | latest_session_consumed_total = | |
3038 | previous_session_consumed_total + | |
3039 | latest_sample.channel_total_consumed; | |
ab0ee2ca JG |
3040 | } |
3041 | ||
e8360425 JD |
3042 | channel_info->session_info->consumed_data_size = |
3043 | latest_session_consumed_total; | |
3044 | ||
ab0ee2ca JG |
3045 | /* Find triggers associated with this channel. */ |
3046 | cds_lfht_lookup(state->channel_triggers_ht, | |
3047 | hash_channel_key(&latest_sample.key), | |
3048 | match_channel_trigger_list, | |
3049 | &latest_sample.key, | |
3050 | &iter); | |
3051 | node = cds_lfht_iter_get_node(&iter); | |
e0b5f87b | 3052 | if (caa_likely(!node)) { |
ab0ee2ca JG |
3053 | goto end_unlock; |
3054 | } | |
3055 | ||
3056 | trigger_list = caa_container_of(node, struct lttng_channel_trigger_list, | |
3057 | channel_triggers_ht_node); | |
3058 | cds_list_for_each_entry(trigger_list_element, &trigger_list->list, | |
3059 | node) { | |
9b63a4aa JG |
3060 | const struct lttng_condition *condition; |
3061 | const struct lttng_action *action; | |
3062 | const struct lttng_trigger *trigger; | |
ab0ee2ca JG |
3063 | struct notification_client_list *client_list; |
3064 | struct lttng_evaluation *evaluation = NULL; | |
3065 | ||
3066 | trigger = trigger_list_element->trigger; | |
9b63a4aa | 3067 | condition = lttng_trigger_get_const_condition(trigger); |
ab0ee2ca | 3068 | assert(condition); |
9b63a4aa | 3069 | action = lttng_trigger_get_const_action(trigger); |
ab0ee2ca JG |
3070 | |
3071 | /* Notify actions are the only type currently supported. */ | |
9b63a4aa | 3072 | assert(lttng_action_get_type_const(action) == |
ab0ee2ca JG |
3073 | LTTNG_ACTION_TYPE_NOTIFY); |
3074 | ||
3075 | /* | |
3076 | * Check if any client is subscribed to the result of this | |
3077 | * evaluation. | |
3078 | */ | |
3079 | cds_lfht_lookup(state->notification_trigger_clients_ht, | |
3080 | lttng_condition_hash(condition), | |
3081 | match_client_list, | |
3082 | trigger, | |
3083 | &iter); | |
3084 | node = cds_lfht_iter_get_node(&iter); | |
3085 | assert(node); | |
3086 | ||
3087 | client_list = caa_container_of(node, | |
3088 | struct notification_client_list, | |
3089 | notification_trigger_ht_node); | |
3090 | if (cds_list_empty(&client_list->list)) { | |
3091 | /* | |
3092 | * No clients interested in the evaluation's result, | |
3093 | * skip it. | |
3094 | */ | |
3095 | continue; | |
3096 | } | |
3097 | ||
3098 | ret = evaluate_condition(condition, &evaluation, state, | |
3099 | previous_sample_available ? &previous_sample : NULL, | |
e8360425 JD |
3100 | &latest_sample, |
3101 | previous_session_consumed_total, | |
3102 | latest_session_consumed_total, | |
3103 | channel_info); | |
3104 | if (caa_unlikely(ret)) { | |
ab0ee2ca JG |
3105 | goto end_unlock; |
3106 | } | |
3107 | ||
e8360425 | 3108 | if (caa_likely(!evaluation)) { |
ab0ee2ca JG |
3109 | continue; |
3110 | } | |
3111 | ||
3112 | /* Dispatch evaluation result to all clients. */ | |
3113 | ret = send_evaluation_to_clients(trigger_list_element->trigger, | |
3114 | evaluation, client_list, state, | |
8abe313a JG |
3115 | channel_info->session_info->uid, |
3116 | channel_info->session_info->gid); | |
3117 | lttng_evaluation_destroy(evaluation); | |
e0b5f87b | 3118 | if (caa_unlikely(ret)) { |
ab0ee2ca JG |
3119 | goto end_unlock; |
3120 | } | |
3121 | } | |
3122 | end_unlock: | |
3123 | rcu_read_unlock(); | |
3124 | end: | |
3125 | return ret; | |
3126 | } |