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db66e574 JD |
1 | /* |
2 | * Copyright (C) 2017 - Julien Desfossez <jdesfossez@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 <lttng/trigger/trigger.h> | |
20 | #include <common/error.h> | |
21 | #include <common/config/session-config.h> | |
22 | #include <common/defaults.h> | |
23 | #include <common/utils.h> | |
24 | #include <common/futex.h> | |
25 | #include <common/align.h> | |
26 | #include <common/time.h> | |
27 | #include <common/hashtable/utils.h> | |
28 | #include <common/kernel-ctl/kernel-ctl.h> | |
29 | #include <sys/eventfd.h> | |
30 | #include <sys/stat.h> | |
31 | #include <time.h> | |
32 | #include <signal.h> | |
33 | #include <inttypes.h> | |
34 | ||
90936dcf | 35 | #include <lttng/notification/channel-internal.h> |
d88744a4 JD |
36 | #include <lttng/rotate-internal.h> |
37 | ||
db66e574 JD |
38 | #include "session.h" |
39 | #include "rotate.h" | |
40 | #include "rotation-thread.h" | |
41 | #include "lttng-sessiond.h" | |
42 | #include "health-sessiond.h" | |
43 | #include "cmd.h" | |
44 | #include "utils.h" | |
90936dcf | 45 | #include "notification-thread-commands.h" |
db66e574 JD |
46 | |
47 | #include <urcu.h> | |
48 | #include <urcu/list.h> | |
49 | #include <urcu/rculfhash.h> | |
50 | ||
51 | unsigned long hash_channel_key(struct rotation_channel_key *key) | |
52 | { | |
53 | return hash_key_u64(&key->key, lttng_ht_seed) ^ hash_key_ulong( | |
54 | (void *) (unsigned long) key->domain, lttng_ht_seed); | |
55 | } | |
56 | ||
5c408ad8 JD |
57 | int rotate_add_channel_pending(uint64_t key, enum lttng_domain_type domain, |
58 | struct ltt_session *session) | |
59 | { | |
60 | int ret; | |
61 | struct rotation_channel_info *new_info; | |
62 | struct rotation_channel_key channel_key = { .key = key, | |
63 | .domain = domain }; | |
64 | ||
65 | new_info = zmalloc(sizeof(struct rotation_channel_info)); | |
66 | if (!new_info) { | |
67 | goto error; | |
68 | } | |
69 | ||
70 | new_info->channel_key.key = key; | |
71 | new_info->channel_key.domain = domain; | |
72 | new_info->session_id = session->id; | |
73 | cds_lfht_node_init(&new_info->rotate_channels_ht_node); | |
74 | ||
75 | session->nr_chan_rotate_pending++; | |
76 | cds_lfht_add(channel_pending_rotate_ht, | |
77 | hash_channel_key(&channel_key), | |
78 | &new_info->rotate_channels_ht_node); | |
79 | ||
80 | ret = 0; | |
81 | goto end; | |
82 | ||
83 | error: | |
84 | ret = -1; | |
85 | end: | |
86 | return ret; | |
87 | } | |
88 | ||
db66e574 JD |
89 | /* The session's lock must be held by the caller. */ |
90 | static | |
91 | int session_rename_chunk(struct ltt_session *session, char *current_path, | |
92 | char *new_path) | |
93 | { | |
94 | int ret; | |
95 | struct consumer_socket *socket; | |
96 | struct consumer_output *output; | |
97 | struct lttng_ht_iter iter; | |
98 | uid_t uid; | |
99 | gid_t gid; | |
100 | ||
101 | DBG("Renaming session chunk path of session \"%s\" from %s to %s", | |
102 | session->name, current_path, new_path); | |
103 | ||
104 | /* | |
105 | * Either one of the sessions is enough to find the consumer_output | |
106 | * and uid/gid. | |
107 | */ | |
108 | if (session->kernel_session) { | |
109 | output = session->kernel_session->consumer; | |
110 | uid = session->kernel_session->uid; | |
111 | gid = session->kernel_session->gid; | |
112 | } else if (session->ust_session) { | |
113 | output = session->ust_session->consumer; | |
114 | uid = session->ust_session->uid; | |
115 | gid = session->ust_session->gid; | |
116 | } else { | |
117 | assert(0); | |
118 | } | |
119 | ||
120 | if (!output || !output->socks) { | |
121 | ERR("No consumer output found for session \"%s\"", | |
122 | session->name); | |
123 | ret = -1; | |
124 | goto end; | |
125 | } | |
126 | ||
127 | rcu_read_lock(); | |
128 | /* | |
129 | * We have to iterate to find a socket, but we only need to send the | |
130 | * rename command to one consumer, so we break after the first one. | |
131 | */ | |
132 | cds_lfht_for_each_entry(output->socks->ht, &iter.iter, socket, node.node) { | |
133 | pthread_mutex_lock(socket->lock); | |
134 | ret = consumer_rotate_rename(socket, session->id, output, | |
135 | current_path, new_path, uid, gid); | |
136 | pthread_mutex_unlock(socket->lock); | |
137 | if (ret) { | |
138 | ret = -1; | |
139 | goto end_unlock; | |
140 | } | |
141 | break; | |
142 | } | |
143 | ||
144 | ret = 0; | |
145 | ||
146 | end_unlock: | |
147 | rcu_read_unlock(); | |
148 | end: | |
149 | return ret; | |
150 | } | |
151 | ||
152 | /* The session's lock must be held by the caller. */ | |
153 | static | |
154 | int rename_first_chunk(struct ltt_session *session, | |
155 | struct consumer_output *consumer, char *new_path) | |
156 | { | |
157 | int ret; | |
158 | char current_full_path[LTTNG_PATH_MAX], new_full_path[LTTNG_PATH_MAX]; | |
159 | ||
160 | /* Current domain path: <session>/kernel */ | |
161 | if (session->net_handle > 0) { | |
162 | ret = snprintf(current_full_path, sizeof(current_full_path), "%s/%s", | |
163 | consumer->dst.net.base_dir, consumer->subdir); | |
164 | if (ret < 0 || ret >= sizeof(current_full_path)) { | |
165 | ERR("Failed to initialize current full path while renaming first rotation chunk of session \"%s\"", | |
166 | session->name); | |
167 | ret = -1; | |
168 | goto error; | |
169 | } | |
170 | } else { | |
171 | ret = snprintf(current_full_path, sizeof(current_full_path), "%s/%s", | |
172 | consumer->dst.session_root_path, consumer->subdir); | |
173 | if (ret < 0 || ret >= sizeof(current_full_path)) { | |
174 | ERR("Failed to initialize current full path while renaming first rotation chunk of session \"%s\"", | |
175 | session->name); | |
176 | ret = -1; | |
177 | goto error; | |
178 | } | |
179 | } | |
180 | /* New domain path: <session>/<start-date>-<end-date>-<rotate-count>/kernel */ | |
181 | ret = snprintf(new_full_path, sizeof(new_full_path), "%s/%s", | |
182 | new_path, consumer->subdir); | |
183 | if (ret < 0 || ret >= sizeof(new_full_path)) { | |
184 | ERR("Failed to initialize new full path while renaming first rotation chunk of session \"%s\"", | |
185 | session->name); | |
186 | ret = -1; | |
187 | goto error; | |
188 | } | |
189 | /* | |
190 | * Move the per-domain fcurrenter inside the first rotation | |
191 | * fcurrenter. | |
192 | */ | |
193 | ret = session_rename_chunk(session, current_full_path, new_full_path); | |
194 | if (ret < 0) { | |
195 | ret = -LTTNG_ERR_UNK; | |
196 | goto error; | |
197 | } | |
198 | ||
199 | ret = 0; | |
200 | ||
201 | error: | |
202 | return ret; | |
203 | } | |
204 | ||
205 | /* | |
206 | * Rename a chunk folder after a rotation is complete. | |
207 | * session_lock_list and session lock must be held. | |
208 | * | |
209 | * Returns 0 on success, a negative value on error. | |
210 | */ | |
211 | int rename_complete_chunk(struct ltt_session *session, time_t ts) | |
212 | { | |
213 | struct tm *timeinfo; | |
db66e574 | 214 | char new_path[LTTNG_PATH_MAX]; |
fc58be13 | 215 | char datetime[21], start_datetime[21]; |
db66e574 JD |
216 | int ret; |
217 | size_t strf_ret; | |
218 | ||
219 | DBG("Renaming completed chunk for session %s", session->name); | |
220 | timeinfo = localtime(&ts); | |
221 | if (!timeinfo) { | |
222 | ERR("Failed to retrieve local time while renaming completed chunk"); | |
223 | ret = -1; | |
224 | goto end; | |
225 | } | |
fc58be13 JD |
226 | |
227 | strf_ret = strftime(datetime, sizeof(datetime), "%Y%m%dT%H%M%S%z", | |
db66e574 JD |
228 | timeinfo); |
229 | if (strf_ret == 0) { | |
230 | ERR("Failed to format timestamp while renaming completed session chunk"); | |
231 | ret = -1; | |
232 | goto end; | |
233 | } | |
234 | ||
235 | if (session->rotate_count == 1) { | |
fc58be13 | 236 | char start_time[21]; |
db66e574 JD |
237 | |
238 | timeinfo = localtime(&session->last_chunk_start_ts); | |
239 | if (!timeinfo) { | |
240 | ERR("Failed to retrieve local time while renaming completed chunk"); | |
241 | ret = -1; | |
242 | goto end; | |
243 | } | |
244 | ||
245 | strf_ret = strftime(start_time, sizeof(start_time), | |
fc58be13 | 246 | "%Y%m%dT%H%M%S%z", timeinfo); |
db66e574 JD |
247 | if (strf_ret == 0) { |
248 | ERR("Failed to format timestamp while renaming completed session chunk"); | |
249 | ret = -1; | |
250 | goto end; | |
251 | } | |
252 | ||
253 | /* | |
254 | * On the first rotation, the current_rotate_path is the | |
255 | * session_root_path, so we need to create the chunk folder | |
256 | * and move the domain-specific folders inside it. | |
257 | */ | |
258 | ret = snprintf(new_path, sizeof(new_path), "%s/%s-%s-%" PRIu64, | |
259 | session->rotation_chunk.current_rotate_path, | |
260 | start_time, | |
261 | datetime, session->rotate_count); | |
262 | if (ret < 0 || ret >= sizeof(new_path)) { | |
263 | ERR("Failed to format new chunk path while renaming session \"%s\"'s first chunk", | |
264 | session->name); | |
265 | ret = -1; | |
266 | goto end; | |
267 | } | |
268 | ||
269 | if (session->kernel_session) { | |
270 | ret = rename_first_chunk(session, | |
271 | session->kernel_session->consumer, | |
272 | new_path); | |
273 | if (ret) { | |
274 | ERR("Failed to rename kernel session trace folder to %s", new_path); | |
275 | /* | |
276 | * This is not a fatal error for the rotation | |
277 | * thread, we just need to inform the client | |
278 | * that a problem occurred with the rotation. | |
279 | * Returning 0, same for the other errors | |
280 | * below. | |
281 | */ | |
282 | ret = 0; | |
283 | goto error; | |
284 | } | |
285 | } | |
286 | if (session->ust_session) { | |
287 | ret = rename_first_chunk(session, | |
288 | session->ust_session->consumer, | |
289 | new_path); | |
290 | if (ret) { | |
291 | ERR("Failed to rename userspace session trace folder to %s", new_path); | |
292 | ret = 0; | |
293 | goto error; | |
294 | } | |
295 | } | |
296 | } else { | |
297 | /* | |
298 | * After the first rotation, all the trace data is already in | |
299 | * its own chunk folder, we just need to append the suffix. | |
300 | */ | |
301 | /* Recreate the session->rotation_chunk.current_rotate_path */ | |
302 | timeinfo = localtime(&session->last_chunk_start_ts); | |
303 | if (!timeinfo) { | |
304 | ERR("Failed to retrieve local time while renaming completed chunk"); | |
305 | ret = -1; | |
306 | goto end; | |
307 | } | |
fc58be13 JD |
308 | strf_ret = strftime(start_datetime, sizeof(start_datetime), |
309 | "%Y%m%dT%H%M%S%z", timeinfo); | |
db66e574 JD |
310 | if (!strf_ret) { |
311 | ERR("Failed to format timestamp while renaming completed session chunk"); | |
312 | ret = -1; | |
313 | goto end; | |
314 | } | |
315 | ret = snprintf(new_path, sizeof(new_path), "%s/%s-%s-%" PRIu64, | |
316 | session_get_base_path(session), | |
317 | start_datetime, | |
318 | datetime, session->rotate_count); | |
319 | if (ret < 0 || ret >= sizeof(new_path)) { | |
320 | ERR("Failed to format new chunk path while renaming chunk of session \"%s\"", | |
321 | session->name); | |
322 | ret = -1; | |
323 | goto error; | |
324 | } | |
325 | ret = session_rename_chunk(session, | |
326 | session->rotation_chunk.current_rotate_path, | |
327 | new_path); | |
328 | if (ret) { | |
329 | ERR("Failed to rename session trace folder from %s to %s", | |
330 | session->rotation_chunk.current_rotate_path, | |
331 | new_path); | |
332 | ret = 0; | |
333 | goto error; | |
334 | } | |
335 | } | |
336 | ||
337 | /* | |
338 | * Store the path where the readable chunk is. This path is valid | |
339 | * and can be queried by the client with rotate_pending until the next | |
340 | * rotation is started. | |
341 | */ | |
342 | ret = lttng_strncpy(session->rotation_chunk.current_rotate_path, | |
343 | new_path, | |
344 | sizeof(session->rotation_chunk.current_rotate_path)); | |
345 | if (ret) { | |
346 | ERR("Failed the current chunk's path of session \"%s\"", | |
347 | session->name); | |
348 | ret = -1; | |
349 | goto error; | |
350 | } | |
351 | ||
352 | goto end; | |
353 | ||
354 | error: | |
d68c9a04 | 355 | session->rotation_state = LTTNG_ROTATION_STATE_ERROR; |
db66e574 JD |
356 | end: |
357 | return ret; | |
358 | } | |
d88744a4 JD |
359 | |
360 | int relay_rotate_pending(struct ltt_session *session, uint64_t chunk_id) | |
361 | { | |
362 | int ret; | |
363 | struct consumer_socket *socket; | |
364 | struct consumer_output *output; | |
365 | struct lttng_ht_iter iter; | |
366 | ||
367 | /* | |
368 | * Either one of the sessions is enough to find the consumer_output | |
369 | * and uid/gid. | |
370 | */ | |
371 | if (session->kernel_session) { | |
372 | output = session->kernel_session->consumer; | |
373 | } else if (session->ust_session) { | |
374 | output = session->ust_session->consumer; | |
375 | } else { | |
376 | assert(0); | |
377 | } | |
378 | ||
379 | if (!output || !output->socks) { | |
380 | ERR("No consumer output found"); | |
381 | ret = -1; | |
382 | goto end; | |
383 | } | |
384 | ||
385 | ret = -1; | |
386 | ||
387 | rcu_read_lock(); | |
388 | /* | |
389 | * We have to iterate to find a socket, but we only need to send the | |
390 | * rotate pending command to one consumer, so we break after the first | |
391 | * one. | |
392 | */ | |
393 | cds_lfht_for_each_entry(output->socks->ht, &iter.iter, socket, | |
394 | node.node) { | |
395 | pthread_mutex_lock(socket->lock); | |
396 | ret = consumer_rotate_pending_relay(socket, output, session->id, | |
397 | chunk_id); | |
398 | pthread_mutex_unlock(socket->lock); | |
399 | break; | |
400 | } | |
401 | rcu_read_unlock(); | |
402 | ||
403 | end: | |
404 | return ret; | |
405 | } | |
90936dcf JD |
406 | |
407 | int subscribe_session_consumed_size_rotation(struct ltt_session *session, uint64_t size, | |
408 | struct notification_thread_handle *notification_thread_handle) | |
409 | { | |
410 | int ret; | |
411 | enum lttng_condition_status condition_status; | |
412 | enum lttng_notification_channel_status nc_status; | |
413 | struct lttng_action *action; | |
414 | ||
415 | session->rotate_condition = lttng_condition_session_consumed_size_create(); | |
416 | if (!session->rotate_condition) { | |
417 | ERR("Failed to create session consumed size condition object"); | |
418 | ret = -1; | |
419 | goto end; | |
420 | } | |
421 | ||
422 | condition_status = lttng_condition_session_consumed_size_set_threshold( | |
423 | session->rotate_condition, size); | |
424 | if (condition_status != LTTNG_CONDITION_STATUS_OK) { | |
425 | ERR("Could not set session consumed size condition threshold (size = %" PRIu64 ")", | |
426 | size); | |
427 | ret = -1; | |
428 | goto end; | |
429 | } | |
430 | ||
431 | condition_status = | |
432 | lttng_condition_session_consumed_size_set_session_name( | |
433 | session->rotate_condition, session->name); | |
434 | if (condition_status != LTTNG_CONDITION_STATUS_OK) { | |
435 | ERR("Could not set session consumed size condition session name (name = %s)", | |
436 | session->name); | |
437 | ret = -1; | |
438 | goto end; | |
439 | } | |
440 | ||
441 | action = lttng_action_notify_create(); | |
442 | if (!action) { | |
443 | ERR("Could not create notify action"); | |
444 | ret = -1; | |
445 | goto end; | |
446 | } | |
447 | ||
448 | session->rotate_trigger = lttng_trigger_create(session->rotate_condition, | |
449 | action); | |
450 | if (!session->rotate_trigger) { | |
451 | ERR("Could not create size-based rotation trigger"); | |
452 | ret = -1; | |
453 | goto end; | |
454 | } | |
455 | ||
456 | nc_status = lttng_notification_channel_subscribe( | |
457 | rotate_notification_channel, session->rotate_condition); | |
458 | if (nc_status != LTTNG_NOTIFICATION_CHANNEL_STATUS_OK) { | |
459 | ERR("Could not subscribe to session consumed size notification"); | |
460 | ret = -1; | |
461 | goto end; | |
462 | } | |
463 | ||
464 | ret = notification_thread_command_register_trigger( | |
465 | notification_thread_handle, session->rotate_trigger); | |
466 | if (ret < 0 && ret != -LTTNG_ERR_TRIGGER_EXISTS) { | |
467 | ERR("Register trigger, %s", lttng_strerror(ret)); | |
468 | ret = -1; | |
469 | goto end; | |
470 | } | |
471 | ||
472 | ret = 0; | |
473 | ||
474 | end: | |
475 | return ret; | |
476 | } | |
477 | ||
478 | int unsubscribe_session_consumed_size_rotation(struct ltt_session *session, | |
479 | struct notification_thread_handle *notification_thread_handle) | |
480 | { | |
481 | int ret = 0; | |
482 | enum lttng_notification_channel_status status; | |
483 | ||
484 | status = lttng_notification_channel_unsubscribe( | |
485 | rotate_notification_channel, | |
486 | session->rotate_condition); | |
487 | if (status != LTTNG_NOTIFICATION_CHANNEL_STATUS_OK) { | |
488 | ERR("Session unsubscribe error: %d", (int) status); | |
489 | ret = -1; | |
490 | goto end; | |
491 | } | |
492 | ||
493 | ret = notification_thread_command_unregister_trigger( | |
494 | notification_thread_handle, session->rotate_trigger); | |
495 | if (ret != LTTNG_OK) { | |
496 | ERR("Session unregister trigger error: %d", ret); | |
497 | goto end; | |
498 | } | |
499 | ||
500 | ret = 0; | |
501 | end: | |
502 | return ret; | |
503 | } |