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