| 1 | /* |
| 2 | * base_client.c |
| 3 | * |
| 4 | * Base client application for testing of LTTng notification API |
| 5 | * |
| 6 | * Copyright 2017 Jonathan Rajotte <jonathan.rajotte-julien@efficios.com> |
| 7 | * |
| 8 | * SPDX-License-Identifier: MIT |
| 9 | * |
| 10 | */ |
| 11 | |
| 12 | #include <stdio.h> |
| 13 | #include <stdbool.h> |
| 14 | #include <string.h> |
| 15 | #include <unistd.h> |
| 16 | #include <inttypes.h> |
| 17 | #include <assert.h> |
| 18 | |
| 19 | #include <lttng/action/action.h> |
| 20 | #include <lttng/action/notify.h> |
| 21 | #include <lttng/condition/buffer-usage.h> |
| 22 | #include <lttng/condition/condition.h> |
| 23 | #include <lttng/condition/evaluation.h> |
| 24 | #include <lttng/domain.h> |
| 25 | #include <lttng/endpoint.h> |
| 26 | #include <lttng/notification/channel.h> |
| 27 | #include <lttng/notification/notification.h> |
| 28 | #include <lttng/trigger/trigger.h> |
| 29 | #include <lttng/lttng-error.h> |
| 30 | |
| 31 | static unsigned int nr_notifications = 0; |
| 32 | static unsigned int nr_expected_notifications = 0; |
| 33 | static const char *session_name = NULL; |
| 34 | static const char *channel_name = NULL; |
| 35 | static double threshold_ratio = 0.0; |
| 36 | static uint64_t threshold_bytes = 0; |
| 37 | static bool is_threshold_ratio = false; |
| 38 | static enum lttng_condition_type buffer_usage_type = LTTNG_CONDITION_TYPE_UNKNOWN; |
| 39 | static enum lttng_domain_type domain_type = LTTNG_DOMAIN_NONE; |
| 40 | |
| 41 | int handle_condition( |
| 42 | const struct lttng_condition *condition, |
| 43 | const struct lttng_evaluation *condition_evaluation); |
| 44 | |
| 45 | static |
| 46 | int parse_arguments(char **argv) |
| 47 | { |
| 48 | const char *domain_type_string = NULL; |
| 49 | const char *buffer_usage_type_string = NULL; |
| 50 | const char *buffer_usage_threshold_type = NULL; |
| 51 | const char *buffer_usage_threshold_value = NULL; |
| 52 | const char *nr_expected_notifications_string = NULL; |
| 53 | |
| 54 | session_name = argv[1]; |
| 55 | channel_name = argv[2]; |
| 56 | domain_type_string = argv[3]; |
| 57 | buffer_usage_type_string = argv[4]; |
| 58 | buffer_usage_threshold_type = argv[5]; |
| 59 | buffer_usage_threshold_value = argv[6]; |
| 60 | nr_expected_notifications_string = argv[7]; |
| 61 | |
| 62 | /* Parse arguments */ |
| 63 | /* Domain type */ |
| 64 | if (!strcasecmp("LTTNG_DOMAIN_UST", domain_type_string)) { |
| 65 | domain_type = LTTNG_DOMAIN_UST; |
| 66 | } |
| 67 | if (!strcasecmp("LTTNG_DOMAIN_KERNEL", domain_type_string)) { |
| 68 | domain_type = LTTNG_DOMAIN_KERNEL; |
| 69 | } |
| 70 | if (domain_type == LTTNG_DOMAIN_NONE) { |
| 71 | printf("error: Unknown domain type\n"); |
| 72 | goto error; |
| 73 | } |
| 74 | |
| 75 | /* Buffer usage condition type */ |
| 76 | if (!strcasecmp("low", buffer_usage_type_string)) { |
| 77 | buffer_usage_type = LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW; |
| 78 | } |
| 79 | if (!strcasecmp("high", buffer_usage_type_string)) { |
| 80 | buffer_usage_type = LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH; |
| 81 | } |
| 82 | if (buffer_usage_type == LTTNG_CONDITION_TYPE_UNKNOWN) { |
| 83 | printf("error: Unknown condition type\n"); |
| 84 | goto error; |
| 85 | } |
| 86 | |
| 87 | /* Ratio or bytes ? */ |
| 88 | if (!strcasecmp("bytes", buffer_usage_threshold_type)) { |
| 89 | is_threshold_ratio = false; |
| 90 | sscanf(buffer_usage_threshold_value, "%" SCNu64, &threshold_bytes); |
| 91 | } |
| 92 | |
| 93 | if (!strcasecmp("ratio", buffer_usage_threshold_type)) { |
| 94 | is_threshold_ratio = true; |
| 95 | sscanf(buffer_usage_threshold_value, "%lf", &threshold_ratio); |
| 96 | } |
| 97 | |
| 98 | /* Number of notification to expect */ |
| 99 | sscanf(nr_expected_notifications_string, "%d", &nr_expected_notifications); |
| 100 | |
| 101 | return 0; |
| 102 | error: |
| 103 | return 1; |
| 104 | } |
| 105 | |
| 106 | int main(int argc, char **argv) |
| 107 | { |
| 108 | int ret = 0; |
| 109 | enum lttng_condition_status condition_status; |
| 110 | enum lttng_notification_channel_status nc_status; |
| 111 | struct lttng_notification_channel *notification_channel = NULL; |
| 112 | struct lttng_condition *condition = NULL; |
| 113 | struct lttng_action *action = NULL; |
| 114 | struct lttng_trigger *trigger = NULL; |
| 115 | |
| 116 | /* |
| 117 | * Disable buffering on stdout. |
| 118 | * Safety measure to prevent hang on the validation side since |
| 119 | * stdout is used for outside synchronization. |
| 120 | */ |
| 121 | setbuf(stdout, NULL); |
| 122 | |
| 123 | if (argc < 8) { |
| 124 | printf("error: Missing arguments for tests\n"); |
| 125 | ret = 1; |
| 126 | goto end; |
| 127 | } |
| 128 | |
| 129 | ret = parse_arguments(argv); |
| 130 | if (ret) { |
| 131 | printf("error: Could not parse arguments\n"); |
| 132 | goto end; |
| 133 | } |
| 134 | |
| 135 | /* Setup */ |
| 136 | notification_channel = lttng_notification_channel_create( |
| 137 | lttng_session_daemon_notification_endpoint); |
| 138 | if (!notification_channel) { |
| 139 | printf("error: Could not create notification channel\n"); |
| 140 | ret = 1; |
| 141 | goto end; |
| 142 | } |
| 143 | |
| 144 | switch (buffer_usage_type) { |
| 145 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: |
| 146 | condition = lttng_condition_buffer_usage_low_create(); |
| 147 | break; |
| 148 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: |
| 149 | condition = lttng_condition_buffer_usage_high_create(); |
| 150 | break; |
| 151 | default: |
| 152 | printf("error: Invalid buffer_usage_type\n"); |
| 153 | ret = 1; |
| 154 | goto end; |
| 155 | } |
| 156 | |
| 157 | if (!condition) { |
| 158 | printf("error: Could not create condition object\n"); |
| 159 | ret = 1; |
| 160 | goto end; |
| 161 | } |
| 162 | |
| 163 | if (is_threshold_ratio) { |
| 164 | condition_status = lttng_condition_buffer_usage_set_threshold_ratio( |
| 165 | condition, threshold_ratio); |
| 166 | } else { |
| 167 | condition_status = lttng_condition_buffer_usage_set_threshold( |
| 168 | condition, threshold_bytes); |
| 169 | } |
| 170 | |
| 171 | if (condition_status != LTTNG_CONDITION_STATUS_OK) { |
| 172 | printf("error: Could not set threshold\n"); |
| 173 | ret = 1; |
| 174 | goto end; |
| 175 | } |
| 176 | |
| 177 | condition_status = lttng_condition_buffer_usage_set_session_name( |
| 178 | condition, session_name); |
| 179 | if (condition_status != LTTNG_CONDITION_STATUS_OK) { |
| 180 | printf("error: Could not set session name\n"); |
| 181 | ret = 1; |
| 182 | goto end; |
| 183 | } |
| 184 | condition_status = lttng_condition_buffer_usage_set_channel_name( |
| 185 | condition, channel_name); |
| 186 | if (condition_status != LTTNG_CONDITION_STATUS_OK) { |
| 187 | printf("error: Could not set channel name\n"); |
| 188 | ret = 1; |
| 189 | goto end; |
| 190 | } |
| 191 | condition_status = lttng_condition_buffer_usage_set_domain_type( |
| 192 | condition, domain_type); |
| 193 | if (condition_status != LTTNG_CONDITION_STATUS_OK) { |
| 194 | printf("error: Could not set domain type\n"); |
| 195 | ret = 1; |
| 196 | goto end; |
| 197 | } |
| 198 | |
| 199 | action = lttng_action_notify_create(); |
| 200 | if (!action) { |
| 201 | printf("error: Could not create action notify\n"); |
| 202 | ret = 1; |
| 203 | goto end; |
| 204 | } |
| 205 | |
| 206 | trigger = lttng_trigger_create(condition, action); |
| 207 | if (!trigger) { |
| 208 | printf("error: Could not create trigger\n"); |
| 209 | ret = 1; |
| 210 | goto end; |
| 211 | } |
| 212 | |
| 213 | ret = lttng_register_trigger(trigger); |
| 214 | |
| 215 | /* |
| 216 | * An equivalent trigger might already be registered if an other app |
| 217 | * registered an equivalent trigger. |
| 218 | */ |
| 219 | if (ret < 0 && ret != -LTTNG_ERR_TRIGGER_EXISTS) { |
| 220 | printf("error: %s\n", lttng_strerror(ret)); |
| 221 | ret = 1; |
| 222 | goto end; |
| 223 | } |
| 224 | |
| 225 | nc_status = lttng_notification_channel_subscribe(notification_channel, condition); |
| 226 | if (nc_status != LTTNG_NOTIFICATION_CHANNEL_STATUS_OK) { |
| 227 | printf("error: Could not subscribe\n"); |
| 228 | ret = 1; |
| 229 | goto end; |
| 230 | } |
| 231 | |
| 232 | /* Tell outside process that the client is ready */ |
| 233 | printf("sync: ready\n"); |
| 234 | |
| 235 | for (;;) { |
| 236 | struct lttng_notification *notification; |
| 237 | enum lttng_notification_channel_status status; |
| 238 | const struct lttng_evaluation *notification_evaluation; |
| 239 | const struct lttng_condition *notification_condition; |
| 240 | |
| 241 | if (nr_notifications == nr_expected_notifications) { |
| 242 | ret = 0; |
| 243 | goto end; |
| 244 | } |
| 245 | /* Receive the next notification. */ |
| 246 | status = lttng_notification_channel_get_next_notification( |
| 247 | notification_channel, |
| 248 | ¬ification); |
| 249 | |
| 250 | switch (status) { |
| 251 | case LTTNG_NOTIFICATION_CHANNEL_STATUS_OK: |
| 252 | break; |
| 253 | case LTTNG_NOTIFICATION_CHANNEL_STATUS_NOTIFICATIONS_DROPPED: |
| 254 | ret = 1; |
| 255 | printf("error: No drop should be observed during this test app\n"); |
| 256 | goto end; |
| 257 | case LTTNG_NOTIFICATION_CHANNEL_STATUS_CLOSED: |
| 258 | /* |
| 259 | * The notification channel has been closed by the |
| 260 | * session daemon. This is typically caused by a session |
| 261 | * daemon shutting down (cleanly or because of a crash). |
| 262 | */ |
| 263 | printf("error: Notification channel was closed\n"); |
| 264 | ret = 1; |
| 265 | goto end; |
| 266 | default: |
| 267 | /* Unhandled conditions / errors. */ |
| 268 | printf("error: Unknown notification channel status\n"); |
| 269 | ret = 1; |
| 270 | goto end; |
| 271 | } |
| 272 | |
| 273 | notification_condition = lttng_notification_get_condition(notification); |
| 274 | notification_evaluation = lttng_notification_get_evaluation(notification); |
| 275 | |
| 276 | ret = handle_condition(notification_condition, notification_evaluation); |
| 277 | nr_notifications++; |
| 278 | |
| 279 | lttng_notification_destroy(notification); |
| 280 | if (ret != 0) { |
| 281 | goto end; |
| 282 | } |
| 283 | } |
| 284 | end: |
| 285 | if (trigger) { |
| 286 | lttng_unregister_trigger(trigger); |
| 287 | } |
| 288 | if (lttng_notification_channel_unsubscribe(notification_channel, condition)) { |
| 289 | printf("error: channel unsubscribe error\n"); |
| 290 | } |
| 291 | lttng_trigger_destroy(trigger); |
| 292 | lttng_condition_destroy(condition); |
| 293 | lttng_action_destroy(action); |
| 294 | lttng_notification_channel_destroy(notification_channel); |
| 295 | printf("exit: %d\n", ret); |
| 296 | return ret; |
| 297 | } |
| 298 | |
| 299 | int handle_condition( |
| 300 | const struct lttng_condition *condition, |
| 301 | const struct lttng_evaluation *evaluation) |
| 302 | { |
| 303 | int ret = 0; |
| 304 | const char *string_low = "low"; |
| 305 | const char *string_high = "high"; |
| 306 | const char *string_condition_type = NULL; |
| 307 | const char *condition_session_name = NULL; |
| 308 | const char *condition_channel_name = NULL; |
| 309 | enum lttng_condition_type condition_type; |
| 310 | enum lttng_domain_type condition_domain_type; |
| 311 | double buffer_usage_ratio; |
| 312 | uint64_t buffer_usage_bytes; |
| 313 | |
| 314 | condition_type = lttng_condition_get_type(condition); |
| 315 | |
| 316 | if (condition_type != buffer_usage_type) { |
| 317 | ret = 1; |
| 318 | printf("error: condition type and buffer usage type are not the same\n"); |
| 319 | goto end; |
| 320 | } |
| 321 | |
| 322 | /* Fetch info to test */ |
| 323 | ret = lttng_condition_buffer_usage_get_session_name(condition, |
| 324 | &condition_session_name); |
| 325 | if (ret) { |
| 326 | printf("error: session name could not be fetched\n"); |
| 327 | ret = 1; |
| 328 | goto end; |
| 329 | } |
| 330 | ret = lttng_condition_buffer_usage_get_channel_name(condition, |
| 331 | &condition_channel_name); |
| 332 | if (ret) { |
| 333 | printf("error: channel name could not be fetched\n"); |
| 334 | ret = 1; |
| 335 | goto end; |
| 336 | } |
| 337 | ret = lttng_condition_buffer_usage_get_domain_type(condition, |
| 338 | &condition_domain_type); |
| 339 | if (ret) { |
| 340 | printf("error: domain type could not be fetched\n"); |
| 341 | ret = 1; |
| 342 | goto end; |
| 343 | } |
| 344 | |
| 345 | if (strcmp(condition_session_name, session_name) != 0) { |
| 346 | printf("error: session name differs\n"); |
| 347 | ret = 1; |
| 348 | goto end; |
| 349 | } |
| 350 | |
| 351 | if (strcmp(condition_channel_name, channel_name) != 0) { |
| 352 | printf("error: channel name differs\n"); |
| 353 | ret = 1; |
| 354 | goto end; |
| 355 | } |
| 356 | |
| 357 | if (condition_domain_type != domain_type) { |
| 358 | printf("error: domain type differs\n"); |
| 359 | ret = 1; |
| 360 | goto end; |
| 361 | } |
| 362 | |
| 363 | if (is_threshold_ratio) { |
| 364 | lttng_evaluation_buffer_usage_get_usage_ratio( |
| 365 | evaluation, &buffer_usage_ratio); |
| 366 | switch (condition_type) { |
| 367 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: |
| 368 | if (buffer_usage_ratio > threshold_ratio) { |
| 369 | printf("error: buffer usage ratio is bigger than set threshold ratio\n"); |
| 370 | ret = 1; |
| 371 | goto end; |
| 372 | } |
| 373 | break; |
| 374 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: |
| 375 | if (buffer_usage_ratio < threshold_ratio) { |
| 376 | printf("error: buffer usage ratio is lower than set threshold ratio\n"); |
| 377 | ret = 1; |
| 378 | goto end; |
| 379 | } |
| 380 | break; |
| 381 | default: |
| 382 | printf("error: Unknown condition type\n"); |
| 383 | ret = 1; |
| 384 | goto end; |
| 385 | } |
| 386 | } else { |
| 387 | lttng_evaluation_buffer_usage_get_usage( |
| 388 | evaluation, &buffer_usage_bytes); |
| 389 | switch (condition_type) { |
| 390 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: |
| 391 | if (buffer_usage_bytes > threshold_bytes) { |
| 392 | printf("error: buffer usage ratio is bigger than set threshold bytes\n"); |
| 393 | ret = 1; |
| 394 | goto end; |
| 395 | } |
| 396 | break; |
| 397 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: |
| 398 | if (buffer_usage_bytes < threshold_bytes) { |
| 399 | printf("error: buffer usage ratio is lower than set threshold bytes\n"); |
| 400 | ret = 1; |
| 401 | goto end; |
| 402 | } |
| 403 | break; |
| 404 | default: |
| 405 | printf("error: Unknown condition type\n"); |
| 406 | ret = 1; |
| 407 | goto end; |
| 408 | } |
| 409 | } |
| 410 | |
| 411 | switch (condition_type) { |
| 412 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: |
| 413 | string_condition_type = string_low; |
| 414 | break; |
| 415 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: |
| 416 | string_condition_type = string_high; |
| 417 | break; |
| 418 | default: |
| 419 | printf("error: Unknown condition type\n"); |
| 420 | ret = 1; |
| 421 | goto end; |
| 422 | } |
| 423 | |
| 424 | printf("notification: %s %d\n", string_condition_type, nr_notifications); |
| 425 | end: |
| 426 | return ret; |
| 427 | } |