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7f4d5b07 JR |
1 | /* |
2 | * Copyright (C) 2021 Jonathan Rajotte <jonathan.rajotte-julien@efficios.com> | |
3 | * | |
4 | * SPDX-License-Identifier: LGPL-2.1-only | |
5 | * | |
6 | */ | |
7 | ||
8 | #include <assert.h> | |
9 | #include <common/buffer-view.h> | |
10 | #include <common/dynamic-buffer.h> | |
11 | #include <common/error.h> | |
12 | #include <common/macros.h> | |
13 | #include <common/payload-view.h> | |
14 | #include <common/payload.h> | |
15 | #include <limits.h> | |
16 | #include <lttng/action/rate-policy-internal.h> | |
17 | #include <lttng/action/rate-policy.h> | |
18 | #include <stdbool.h> | |
19 | #include <sys/types.h> | |
20 | ||
21 | #define IS_EVERY_N_RATE_POLICY(policy) \ | |
22 | (lttng_rate_policy_get_type(policy) == LTTNG_RATE_POLICY_TYPE_EVERY_N) | |
23 | ||
24 | #define IS_ONCE_AFTER_N_RATE_POLICY(policy) \ | |
25 | (lttng_rate_policy_get_type(policy) == \ | |
26 | LTTNG_RATE_POLICY_TYPE_ONCE_AFTER_N) | |
27 | ||
28 | typedef void (*rate_policy_destroy_cb)(struct lttng_rate_policy *rate_policy); | |
29 | typedef int (*rate_policy_serialize_cb)(struct lttng_rate_policy *rate_policy, | |
30 | struct lttng_payload *payload); | |
31 | typedef bool (*rate_policy_equal_cb)(const struct lttng_rate_policy *a, | |
32 | const struct lttng_rate_policy *b); | |
33 | typedef ssize_t (*rate_policy_create_from_payload_cb)( | |
34 | struct lttng_payload_view *view, | |
35 | struct lttng_rate_policy **rate_policy); | |
36 | typedef struct lttng_rate_policy *(*rate_policy_copy_cb)( | |
37 | const struct lttng_rate_policy *source); | |
38 | ||
39 | struct lttng_rate_policy { | |
40 | enum lttng_rate_policy_type type; | |
41 | rate_policy_serialize_cb serialize; | |
42 | rate_policy_equal_cb equal; | |
43 | rate_policy_destroy_cb destroy; | |
44 | rate_policy_copy_cb copy; | |
45 | }; | |
46 | ||
47 | struct lttng_rate_policy_every_n { | |
48 | struct lttng_rate_policy parent; | |
49 | uint64_t interval; | |
50 | }; | |
51 | ||
52 | struct lttng_rate_policy_once_after_n { | |
53 | struct lttng_rate_policy parent; | |
54 | uint64_t threshold; | |
55 | }; | |
56 | ||
57 | struct lttng_rate_policy_comm { | |
58 | /* enum lttng_rate_policy_type */ | |
59 | int8_t rate_policy_type; | |
60 | } LTTNG_PACKED; | |
61 | ||
62 | struct lttng_rate_policy_once_after_n_comm { | |
63 | uint64_t threshold; | |
64 | } LTTNG_PACKED; | |
65 | ||
66 | struct lttng_rate_policy_every_n_comm { | |
67 | uint64_t interval; | |
68 | } LTTNG_PACKED; | |
69 | ||
70 | /* Forward declaration. */ | |
71 | static void lttng_rate_policy_init(struct lttng_rate_policy *rate_policy, | |
72 | enum lttng_rate_policy_type type, | |
73 | rate_policy_serialize_cb serialize, | |
74 | rate_policy_equal_cb equal, | |
75 | rate_policy_destroy_cb destroy, | |
76 | rate_policy_copy_cb copy); | |
77 | ||
78 | /* Forward declaration. Every n */ | |
79 | static bool lttng_rate_policy_every_n_should_execute( | |
80 | const struct lttng_rate_policy *policy, uint64_t counter); | |
81 | ||
82 | /* Forward declaration. Once after N */ | |
83 | static bool lttng_rate_policy_once_after_n_should_execute( | |
84 | const struct lttng_rate_policy *policy, uint64_t counter); | |
85 | ||
86 | LTTNG_HIDDEN | |
87 | const char *lttng_rate_policy_type_string( | |
88 | enum lttng_rate_policy_type rate_policy_type) | |
89 | { | |
90 | switch (rate_policy_type) { | |
91 | case LTTNG_RATE_POLICY_TYPE_EVERY_N: | |
92 | return "EVERY-N"; | |
93 | case LTTNG_RATE_POLICY_TYPE_ONCE_AFTER_N: | |
94 | return "ONCE-AFTER-N"; | |
95 | default: | |
96 | return "???"; | |
97 | } | |
98 | } | |
99 | ||
100 | enum lttng_rate_policy_type lttng_rate_policy_get_type( | |
101 | const struct lttng_rate_policy *policy) | |
102 | { | |
103 | return policy ? policy->type : LTTNG_RATE_POLICY_TYPE_UNKNOWN; | |
104 | } | |
105 | ||
106 | LTTNG_HIDDEN | |
107 | void lttng_rate_policy_init(struct lttng_rate_policy *rate_policy, | |
108 | enum lttng_rate_policy_type type, | |
109 | rate_policy_serialize_cb serialize, | |
110 | rate_policy_equal_cb equal, | |
111 | rate_policy_destroy_cb destroy, | |
112 | rate_policy_copy_cb copy) | |
113 | { | |
114 | rate_policy->type = type; | |
115 | rate_policy->serialize = serialize; | |
116 | rate_policy->equal = equal; | |
117 | rate_policy->destroy = destroy; | |
118 | rate_policy->copy = copy; | |
119 | } | |
120 | ||
121 | void lttng_rate_policy_destroy(struct lttng_rate_policy *rate_policy) | |
122 | { | |
123 | if (!rate_policy) { | |
124 | return; | |
125 | } | |
126 | ||
127 | rate_policy->destroy(rate_policy); | |
128 | } | |
129 | ||
130 | LTTNG_HIDDEN | |
131 | int lttng_rate_policy_serialize(struct lttng_rate_policy *rate_policy, | |
132 | struct lttng_payload *payload) | |
133 | { | |
134 | int ret; | |
135 | struct lttng_rate_policy_comm rate_policy_comm = { | |
136 | .rate_policy_type = (int8_t) rate_policy->type, | |
137 | }; | |
138 | ||
139 | ret = lttng_dynamic_buffer_append(&payload->buffer, &rate_policy_comm, | |
140 | sizeof(rate_policy_comm)); | |
141 | if (ret) { | |
142 | goto end; | |
143 | } | |
144 | ||
145 | ret = rate_policy->serialize(rate_policy, payload); | |
146 | if (ret) { | |
147 | goto end; | |
148 | } | |
149 | end: | |
150 | return ret; | |
151 | } | |
152 | ||
153 | static ssize_t lttng_rate_policy_once_after_n_create_from_payload( | |
154 | struct lttng_payload_view *view, | |
155 | struct lttng_rate_policy **rate_policy) | |
156 | { | |
157 | ssize_t consumed_len = -1; | |
158 | struct lttng_rate_policy *policy = NULL; | |
159 | const struct lttng_rate_policy_once_after_n_comm *comm; | |
160 | const struct lttng_payload_view comm_view = | |
161 | lttng_payload_view_from_view(view, 0, sizeof(*comm)); | |
162 | ||
163 | if (!view || !rate_policy) { | |
164 | consumed_len = -1; | |
165 | goto end; | |
166 | } | |
167 | ||
168 | if (!lttng_payload_view_is_valid(&comm_view)) { | |
169 | /* Payload not large enough to contain the header. */ | |
170 | consumed_len = -1; | |
171 | goto end; | |
172 | } | |
173 | ||
174 | comm = (const struct lttng_rate_policy_once_after_n_comm *) | |
175 | comm_view.buffer.data; | |
176 | ||
177 | policy = lttng_rate_policy_once_after_n_create(comm->threshold); | |
178 | if (policy == NULL) { | |
179 | consumed_len = -1; | |
180 | goto end; | |
181 | } | |
182 | ||
183 | *rate_policy = policy; | |
184 | consumed_len = sizeof(*comm); | |
185 | ||
186 | end: | |
187 | return consumed_len; | |
188 | } | |
189 | ||
190 | static ssize_t lttng_rate_policy_every_n_create_from_payload( | |
191 | struct lttng_payload_view *view, | |
192 | struct lttng_rate_policy **rate_policy) | |
193 | { | |
194 | ssize_t consumed_len = -1; | |
195 | struct lttng_rate_policy *policy = NULL; | |
196 | const struct lttng_rate_policy_every_n_comm *comm; | |
197 | const struct lttng_payload_view comm_view = | |
198 | lttng_payload_view_from_view(view, 0, sizeof(*comm)); | |
199 | ||
200 | if (!view || !rate_policy) { | |
201 | consumed_len = -1; | |
202 | goto end; | |
203 | } | |
204 | ||
205 | if (!lttng_payload_view_is_valid(&comm_view)) { | |
206 | /* Payload not large enough to contain the header. */ | |
207 | consumed_len = -1; | |
208 | goto end; | |
209 | } | |
210 | ||
211 | comm = (const struct lttng_rate_policy_every_n_comm *) | |
212 | comm_view.buffer.data; | |
213 | ||
214 | policy = lttng_rate_policy_every_n_create(comm->interval); | |
215 | if (policy == NULL) { | |
216 | consumed_len = -1; | |
217 | goto end; | |
218 | } | |
219 | ||
220 | *rate_policy = policy; | |
221 | consumed_len = sizeof(*comm); | |
222 | ||
223 | end: | |
224 | return consumed_len; | |
225 | } | |
226 | ||
227 | LTTNG_HIDDEN | |
228 | ssize_t lttng_rate_policy_create_from_payload(struct lttng_payload_view *view, | |
229 | struct lttng_rate_policy **rate_policy) | |
230 | { | |
231 | ssize_t consumed_len, specific_rate_policy_consumed_len; | |
232 | rate_policy_create_from_payload_cb create_from_payload_cb; | |
233 | const struct lttng_rate_policy_comm *rate_policy_comm; | |
234 | const struct lttng_payload_view rate_policy_comm_view = | |
235 | lttng_payload_view_from_view( | |
236 | view, 0, sizeof(*rate_policy_comm)); | |
237 | ||
238 | if (!view || !rate_policy) { | |
239 | consumed_len = -1; | |
240 | goto end; | |
241 | } | |
242 | ||
243 | if (!lttng_payload_view_is_valid(&rate_policy_comm_view)) { | |
244 | /* Payload not large enough to contain the header. */ | |
245 | consumed_len = -1; | |
246 | goto end; | |
247 | } | |
248 | ||
249 | rate_policy_comm = (const struct lttng_rate_policy_comm *) | |
250 | rate_policy_comm_view.buffer.data; | |
251 | ||
252 | DBG("Create rate_policy from payload: rate-policy-type=%s", | |
253 | lttng_rate_policy_type_string( | |
254 | rate_policy_comm->rate_policy_type)); | |
255 | ||
256 | switch (rate_policy_comm->rate_policy_type) { | |
257 | case LTTNG_RATE_POLICY_TYPE_EVERY_N: | |
258 | create_from_payload_cb = | |
259 | lttng_rate_policy_every_n_create_from_payload; | |
260 | break; | |
261 | case LTTNG_RATE_POLICY_TYPE_ONCE_AFTER_N: | |
262 | create_from_payload_cb = | |
263 | lttng_rate_policy_once_after_n_create_from_payload; | |
264 | break; | |
265 | default: | |
266 | ERR("Failed to create rate-policy from payload, unhandled rate-policy type: rate-policy-type=%u (%s)", | |
267 | rate_policy_comm->rate_policy_type, | |
268 | lttng_rate_policy_type_string( | |
269 | rate_policy_comm->rate_policy_type)); | |
270 | consumed_len = -1; | |
271 | goto end; | |
272 | } | |
273 | ||
274 | { | |
275 | /* Create buffer view for the rate_policy-type-specific data. | |
276 | */ | |
277 | struct lttng_payload_view specific_rate_policy_view = | |
278 | lttng_payload_view_from_view(view, | |
279 | sizeof(struct lttng_rate_policy_comm), | |
280 | -1); | |
281 | ||
282 | specific_rate_policy_consumed_len = create_from_payload_cb( | |
283 | &specific_rate_policy_view, rate_policy); | |
284 | } | |
285 | if (specific_rate_policy_consumed_len < 0) { | |
286 | ERR("Failed to create specific rate_policy from buffer."); | |
287 | consumed_len = -1; | |
288 | goto end; | |
289 | } | |
290 | ||
291 | assert(*rate_policy); | |
292 | ||
293 | consumed_len = sizeof(struct lttng_rate_policy_comm) + | |
294 | specific_rate_policy_consumed_len; | |
295 | ||
296 | end: | |
297 | return consumed_len; | |
298 | } | |
299 | ||
300 | LTTNG_HIDDEN | |
301 | bool lttng_rate_policy_is_equal(const struct lttng_rate_policy *a, | |
302 | const struct lttng_rate_policy *b) | |
303 | { | |
304 | bool is_equal = false; | |
305 | ||
306 | if (!a || !b) { | |
307 | goto end; | |
308 | } | |
309 | ||
310 | if (a->type != b->type) { | |
311 | goto end; | |
312 | } | |
313 | ||
314 | if (a == b) { | |
315 | is_equal = true; | |
316 | goto end; | |
317 | } | |
318 | ||
319 | assert(a->equal); | |
320 | is_equal = a->equal(a, b); | |
321 | end: | |
322 | return is_equal; | |
323 | } | |
324 | ||
325 | LTTNG_HIDDEN | |
326 | bool lttng_rate_policy_should_execute( | |
327 | const struct lttng_rate_policy *policy, uint64_t counter) | |
328 | { | |
329 | switch (policy->type) { | |
330 | case LTTNG_RATE_POLICY_TYPE_EVERY_N: | |
331 | return lttng_rate_policy_every_n_should_execute( | |
332 | policy, counter); | |
333 | case LTTNG_RATE_POLICY_TYPE_ONCE_AFTER_N: | |
334 | return lttng_rate_policy_once_after_n_should_execute( | |
335 | policy, counter); | |
336 | default: | |
337 | abort(); | |
338 | break; | |
339 | } | |
340 | } | |
341 | ||
342 | /* Every N */ | |
343 | static struct lttng_rate_policy_every_n *rate_policy_every_n_from_rate_policy( | |
344 | struct lttng_rate_policy *policy) | |
345 | { | |
346 | assert(policy); | |
347 | ||
348 | return container_of(policy, struct lttng_rate_policy_every_n, parent); | |
349 | } | |
350 | ||
351 | static const struct lttng_rate_policy_every_n * | |
352 | rate_policy_every_n_from_rate_policy_const( | |
353 | const struct lttng_rate_policy *policy) | |
354 | { | |
355 | assert(policy); | |
356 | ||
357 | return container_of(policy, struct lttng_rate_policy_every_n, parent); | |
358 | } | |
359 | ||
360 | static int lttng_rate_policy_every_n_serialize( | |
361 | struct lttng_rate_policy *policy, struct lttng_payload *payload) | |
362 | { | |
363 | int ret; | |
364 | ||
365 | struct lttng_rate_policy_every_n *every_n_policy; | |
366 | struct lttng_rate_policy_every_n_comm comm = {}; | |
367 | ||
368 | assert(policy); | |
369 | assert(payload); | |
370 | ||
371 | every_n_policy = rate_policy_every_n_from_rate_policy(policy); | |
372 | comm.interval = every_n_policy->interval; | |
373 | ||
374 | ret = lttng_dynamic_buffer_append( | |
375 | &payload->buffer, &comm, sizeof(comm)); | |
376 | return ret; | |
377 | } | |
378 | ||
379 | static bool lttng_rate_policy_every_n_is_equal( | |
380 | const struct lttng_rate_policy *_a, | |
381 | const struct lttng_rate_policy *_b) | |
382 | { | |
383 | bool is_equal = false; | |
384 | const struct lttng_rate_policy_every_n *a, *b; | |
385 | ||
386 | a = rate_policy_every_n_from_rate_policy_const(_a); | |
387 | b = rate_policy_every_n_from_rate_policy_const(_b); | |
388 | ||
389 | if (a->interval != b->interval) { | |
390 | goto end; | |
391 | } | |
392 | ||
393 | is_equal = true; | |
394 | ||
395 | end: | |
396 | return is_equal; | |
397 | } | |
398 | ||
399 | static void lttng_rate_policy_every_n_destroy(struct lttng_rate_policy *policy) | |
400 | { | |
401 | struct lttng_rate_policy_every_n *every_n_policy; | |
402 | ||
403 | if (!policy) { | |
404 | goto end; | |
405 | } | |
406 | ||
407 | every_n_policy = rate_policy_every_n_from_rate_policy(policy); | |
408 | ||
409 | free(every_n_policy); | |
410 | ||
411 | end: | |
412 | return; | |
413 | } | |
414 | ||
415 | static struct lttng_rate_policy *lttng_rate_policy_every_n_copy( | |
416 | const struct lttng_rate_policy *source) | |
417 | { | |
418 | struct lttng_rate_policy *copy = NULL; | |
419 | const struct lttng_rate_policy_every_n *every_n_policy; | |
420 | ||
421 | if (!source) { | |
422 | goto end; | |
423 | } | |
424 | ||
425 | every_n_policy = rate_policy_every_n_from_rate_policy_const(source); | |
426 | copy = lttng_rate_policy_every_n_create(every_n_policy->interval); | |
427 | ||
428 | end: | |
429 | return copy; | |
430 | } | |
431 | ||
432 | struct lttng_rate_policy *lttng_rate_policy_every_n_create(uint64_t interval) | |
433 | { | |
434 | struct lttng_rate_policy_every_n *policy = NULL; | |
435 | struct lttng_rate_policy *_policy = NULL; | |
436 | ||
437 | if (interval == 0) { | |
438 | /* | |
439 | * An interval of 0 is invalid since it would never be fired. | |
440 | */ | |
441 | goto end; | |
442 | } | |
443 | ||
444 | policy = zmalloc(sizeof(struct lttng_rate_policy_every_n)); | |
445 | if (!policy) { | |
446 | goto end; | |
447 | } | |
448 | ||
449 | lttng_rate_policy_init(&policy->parent, LTTNG_RATE_POLICY_TYPE_EVERY_N, | |
450 | lttng_rate_policy_every_n_serialize, | |
451 | lttng_rate_policy_every_n_is_equal, | |
452 | lttng_rate_policy_every_n_destroy, | |
453 | lttng_rate_policy_every_n_copy); | |
454 | ||
455 | policy->interval = interval; | |
456 | ||
457 | _policy = &policy->parent; | |
458 | policy = NULL; | |
459 | ||
460 | end: | |
461 | free(policy); | |
462 | return _policy; | |
463 | } | |
464 | ||
465 | LTTNG_HIDDEN | |
466 | enum lttng_rate_policy_status lttng_rate_policy_every_n_get_interval( | |
467 | const struct lttng_rate_policy *policy, uint64_t *interval) | |
468 | { | |
469 | const struct lttng_rate_policy_every_n *every_n_policy; | |
470 | enum lttng_rate_policy_status status; | |
471 | ||
472 | if (!policy || !IS_EVERY_N_RATE_POLICY(policy) || !interval) { | |
473 | status = LTTNG_RATE_POLICY_STATUS_INVALID; | |
474 | goto end; | |
475 | } | |
476 | ||
477 | every_n_policy = rate_policy_every_n_from_rate_policy_const(policy); | |
478 | *interval = every_n_policy->interval; | |
479 | status = LTTNG_RATE_POLICY_STATUS_OK; | |
480 | end: | |
481 | ||
482 | return status; | |
483 | } | |
484 | ||
485 | static bool lttng_rate_policy_every_n_should_execute( | |
486 | const struct lttng_rate_policy *policy, uint64_t counter) | |
487 | { | |
488 | const struct lttng_rate_policy_every_n *every_n_policy; | |
489 | assert(policy); | |
490 | bool execute = false; | |
491 | ||
492 | every_n_policy = rate_policy_every_n_from_rate_policy_const(policy); | |
493 | ||
494 | if (every_n_policy->interval == 0) { | |
495 | abort(); | |
496 | } | |
497 | ||
498 | execute = (counter % every_n_policy->interval) == 0; | |
499 | ||
500 | DBG("Policy every N = %" PRIu64 | |
501 | ": execution %s. Execution count: %" PRIu64, | |
502 | every_n_policy->interval, | |
503 | execute ? "accepted" : "denied", counter); | |
504 | ||
505 | return execute; | |
506 | } | |
507 | ||
508 | /* Once after N */ | |
509 | ||
510 | static struct lttng_rate_policy_once_after_n * | |
511 | rate_policy_once_after_n_from_rate_policy(struct lttng_rate_policy *policy) | |
512 | { | |
513 | assert(policy); | |
514 | ||
515 | return container_of( | |
516 | policy, struct lttng_rate_policy_once_after_n, parent); | |
517 | } | |
518 | ||
519 | static const struct lttng_rate_policy_once_after_n * | |
520 | rate_policy_once_after_n_from_rate_policy_const( | |
521 | const struct lttng_rate_policy *policy) | |
522 | { | |
523 | assert(policy); | |
524 | ||
525 | return container_of( | |
526 | policy, struct lttng_rate_policy_once_after_n, parent); | |
527 | } | |
528 | static int lttng_rate_policy_once_after_n_serialize( | |
529 | struct lttng_rate_policy *policy, struct lttng_payload *payload) | |
530 | { | |
531 | int ret; | |
532 | ||
533 | struct lttng_rate_policy_once_after_n *once_after_n_policy; | |
534 | struct lttng_rate_policy_once_after_n_comm comm = {}; | |
535 | ||
536 | assert(policy); | |
537 | assert(payload); | |
538 | ||
539 | once_after_n_policy = rate_policy_once_after_n_from_rate_policy(policy); | |
540 | comm.threshold = once_after_n_policy->threshold; | |
541 | ||
542 | ret = lttng_dynamic_buffer_append( | |
543 | &payload->buffer, &comm, sizeof(comm)); | |
544 | return ret; | |
545 | } | |
546 | ||
547 | static bool lttng_rate_policy_once_after_n_is_equal( | |
548 | const struct lttng_rate_policy *_a, | |
549 | const struct lttng_rate_policy *_b) | |
550 | { | |
551 | bool is_equal = false; | |
552 | const struct lttng_rate_policy_once_after_n *a, *b; | |
553 | ||
554 | a = rate_policy_once_after_n_from_rate_policy_const(_a); | |
555 | b = rate_policy_once_after_n_from_rate_policy_const(_b); | |
556 | ||
557 | if (a->threshold != b->threshold) { | |
558 | goto end; | |
559 | } | |
560 | ||
561 | is_equal = true; | |
562 | ||
563 | end: | |
564 | return is_equal; | |
565 | } | |
566 | ||
567 | static void lttng_rate_policy_once_after_n_destroy( | |
568 | struct lttng_rate_policy *policy) | |
569 | { | |
570 | struct lttng_rate_policy_once_after_n *once_after_n_policy; | |
571 | ||
572 | if (!policy) { | |
573 | goto end; | |
574 | } | |
575 | ||
576 | once_after_n_policy = rate_policy_once_after_n_from_rate_policy(policy); | |
577 | ||
578 | free(once_after_n_policy); | |
579 | ||
580 | end: | |
581 | return; | |
582 | } | |
583 | ||
584 | static struct lttng_rate_policy *lttng_rate_policy_once_after_n_copy( | |
585 | const struct lttng_rate_policy *source) | |
586 | { | |
587 | struct lttng_rate_policy *copy = NULL; | |
588 | const struct lttng_rate_policy_once_after_n *once_after_n_policy; | |
589 | ||
590 | if (!source) { | |
591 | goto end; | |
592 | } | |
593 | ||
594 | once_after_n_policy = | |
595 | rate_policy_once_after_n_from_rate_policy_const(source); | |
596 | copy = lttng_rate_policy_once_after_n_create( | |
597 | once_after_n_policy->threshold); | |
598 | ||
599 | end: | |
600 | return copy; | |
601 | } | |
602 | ||
603 | struct lttng_rate_policy *lttng_rate_policy_once_after_n_create( | |
604 | uint64_t threshold) | |
605 | { | |
606 | struct lttng_rate_policy_once_after_n *policy = NULL; | |
607 | struct lttng_rate_policy *_policy = NULL; | |
608 | ||
609 | if (threshold == 0) { | |
610 | /* threshold is expected to be > 0 */ | |
611 | goto end; | |
612 | } | |
613 | ||
614 | policy = zmalloc(sizeof(struct lttng_rate_policy_once_after_n)); | |
615 | if (!policy) { | |
616 | goto end; | |
617 | } | |
618 | ||
619 | lttng_rate_policy_init(&policy->parent, | |
620 | LTTNG_RATE_POLICY_TYPE_ONCE_AFTER_N, | |
621 | lttng_rate_policy_once_after_n_serialize, | |
622 | lttng_rate_policy_once_after_n_is_equal, | |
623 | lttng_rate_policy_once_after_n_destroy, | |
624 | lttng_rate_policy_once_after_n_copy); | |
625 | ||
626 | policy->threshold = threshold; | |
627 | ||
628 | _policy = &policy->parent; | |
629 | policy = NULL; | |
630 | ||
631 | end: | |
632 | free(policy); | |
633 | return _policy; | |
634 | } | |
635 | ||
636 | LTTNG_HIDDEN | |
637 | enum lttng_rate_policy_status lttng_rate_policy_once_after_n_get_threshold( | |
638 | const struct lttng_rate_policy *policy, uint64_t *threshold) | |
639 | { | |
640 | const struct lttng_rate_policy_once_after_n *once_after_n_policy; | |
641 | enum lttng_rate_policy_status status; | |
642 | ||
643 | if (!policy || !IS_ONCE_AFTER_N_RATE_POLICY(policy) || !threshold) { | |
644 | status = LTTNG_RATE_POLICY_STATUS_INVALID; | |
645 | goto end; | |
646 | } | |
647 | ||
648 | once_after_n_policy = | |
649 | rate_policy_once_after_n_from_rate_policy_const(policy); | |
650 | *threshold = once_after_n_policy->threshold; | |
651 | status = LTTNG_RATE_POLICY_STATUS_OK; | |
652 | end: | |
653 | ||
654 | return status; | |
655 | } | |
656 | ||
657 | LTTNG_HIDDEN | |
658 | struct lttng_rate_policy *lttng_rate_policy_copy( | |
659 | const struct lttng_rate_policy *source) | |
660 | { | |
661 | assert(source->copy); | |
662 | return source->copy(source); | |
663 | } | |
664 | ||
665 | static bool lttng_rate_policy_once_after_n_should_execute( | |
666 | const struct lttng_rate_policy *policy, uint64_t counter) | |
667 | { | |
668 | const struct lttng_rate_policy_once_after_n *once_after_n_policy; | |
669 | bool execute = false; | |
670 | assert(policy); | |
671 | ||
672 | once_after_n_policy = | |
673 | rate_policy_once_after_n_from_rate_policy_const(policy); | |
674 | ||
675 | execute = counter == once_after_n_policy->threshold; | |
676 | ||
677 | DBG("Policy once after N = %" PRIu64 | |
678 | ": execution %s. Execution count: %" PRIu64, | |
679 | once_after_n_policy->threshold, | |
680 | execute ? "accepted" : "denied", counter); | |
681 | ||
682 | return counter == once_after_n_policy->threshold; | |
683 | } |