Commit | Line | Data |
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d3e2ba59 JD |
1 | /* |
2 | * Copyright (C) 2013 - Julien Desfossez <jdesfossez@efficios.com> | |
3 | * David Goulet <dgoulet@efficios.com> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License, version 2 only, | |
7 | * as published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
12 | * more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License along | |
15 | * with this program; if not, write to the Free Software Foundation, Inc., | |
16 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
17 | */ | |
18 | ||
19 | #define _GNU_SOURCE | |
20 | #include <getopt.h> | |
21 | #include <grp.h> | |
22 | #include <limits.h> | |
23 | #include <pthread.h> | |
24 | #include <signal.h> | |
25 | #include <stdio.h> | |
26 | #include <stdlib.h> | |
27 | #include <string.h> | |
28 | #include <sys/mman.h> | |
29 | #include <sys/mount.h> | |
30 | #include <sys/resource.h> | |
31 | #include <sys/socket.h> | |
32 | #include <sys/stat.h> | |
33 | #include <sys/types.h> | |
34 | #include <sys/wait.h> | |
35 | #include <inttypes.h> | |
36 | #include <urcu/futex.h> | |
37 | #include <urcu/uatomic.h> | |
38 | #include <unistd.h> | |
39 | #include <fcntl.h> | |
40 | #include <config.h> | |
41 | ||
42 | #include <lttng/lttng.h> | |
43 | #include <common/common.h> | |
44 | #include <common/compat/poll.h> | |
45 | #include <common/compat/socket.h> | |
46 | #include <common/defaults.h> | |
47 | #include <common/futex.h> | |
991adae2 | 48 | #include <common/index/index.h> |
d3e2ba59 JD |
49 | #include <common/sessiond-comm/sessiond-comm.h> |
50 | #include <common/sessiond-comm/inet.h> | |
51 | #include <common/sessiond-comm/relayd.h> | |
52 | #include <common/uri.h> | |
53 | #include <common/utils.h> | |
54 | ||
55 | #include "cmd.h" | |
56 | #include "live.h" | |
57 | #include "lttng-relayd.h" | |
d3e2ba59 | 58 | #include "utils.h" |
eea7556c | 59 | #include "health-relayd.h" |
4e5b8b82 | 60 | #include "testpoint.h" |
991adae2 | 61 | #include "viewer-stream.h" |
d3e2ba59 JD |
62 | |
63 | static struct lttng_uri *live_uri; | |
64 | ||
d3e2ba59 JD |
65 | /* |
66 | * This pipe is used to inform the worker thread that a command is queued and | |
67 | * ready to be processed. | |
68 | */ | |
69 | static int live_relay_cmd_pipe[2] = { -1, -1 }; | |
70 | ||
71 | /* Shared between threads */ | |
72 | static int live_dispatch_thread_exit; | |
73 | ||
74 | static pthread_t live_listener_thread; | |
75 | static pthread_t live_dispatcher_thread; | |
76 | static pthread_t live_worker_thread; | |
77 | ||
78 | /* | |
79 | * Relay command queue. | |
80 | * | |
81 | * The live_thread_listener and live_thread_dispatcher communicate with this | |
82 | * queue. | |
83 | */ | |
84 | static struct relay_cmd_queue viewer_cmd_queue; | |
85 | ||
86 | static uint64_t last_relay_viewer_session_id; | |
87 | ||
88 | /* | |
89 | * Cleanup the daemon | |
90 | */ | |
91 | static | |
92 | void cleanup(void) | |
93 | { | |
94 | DBG("Cleaning up"); | |
95 | ||
d3e2ba59 JD |
96 | free(live_uri); |
97 | } | |
98 | ||
991adae2 DG |
99 | /* |
100 | * Receive a request buffer using a given socket, destination allocated buffer | |
101 | * of length size. | |
102 | * | |
103 | * Return the size of the received message or else a negative value on error | |
104 | * with errno being set by recvmsg() syscall. | |
105 | */ | |
106 | static | |
107 | ssize_t recv_request(struct lttcomm_sock *sock, void *buf, size_t size) | |
108 | { | |
109 | ssize_t ret; | |
110 | ||
111 | assert(sock); | |
112 | assert(buf); | |
113 | ||
114 | ret = sock->ops->recvmsg(sock, buf, size, 0); | |
115 | if (ret < 0 || ret != size) { | |
116 | if (ret == 0) { | |
117 | /* Orderly shutdown. Not necessary to print an error. */ | |
118 | DBG("Socket %d did an orderly shutdown", sock->fd); | |
119 | } else { | |
120 | ERR("Relay failed to receive request."); | |
121 | } | |
122 | ret = -1; | |
123 | } | |
124 | ||
125 | return ret; | |
126 | } | |
127 | ||
128 | /* | |
129 | * Send a response buffer using a given socket, source allocated buffer of | |
130 | * length size. | |
131 | * | |
132 | * Return the size of the sent message or else a negative value on error with | |
133 | * errno being set by sendmsg() syscall. | |
134 | */ | |
135 | static | |
136 | ssize_t send_response(struct lttcomm_sock *sock, void *buf, size_t size) | |
137 | { | |
138 | ssize_t ret; | |
139 | ||
140 | assert(sock); | |
141 | assert(buf); | |
142 | ||
143 | ret = sock->ops->sendmsg(sock, buf, size, 0); | |
144 | if (ret < 0) { | |
145 | ERR("Relayd failed to send response."); | |
146 | } | |
147 | ||
148 | return ret; | |
149 | } | |
150 | ||
151 | /* | |
152 | * Atomically check if new streams got added in the session since the last | |
153 | * check and reset the flag to 0. | |
154 | * | |
155 | * Returns 1 if new streams got added, 0 if nothing changed, a negative value | |
156 | * on error. | |
157 | */ | |
158 | static | |
159 | int check_new_streams(uint64_t session_id, struct lttng_ht *sessions_ht) | |
160 | { | |
161 | int ret; | |
162 | unsigned long current_val; | |
163 | struct relay_session *session; | |
164 | ||
165 | assert(sessions_ht); | |
166 | ||
167 | session = session_find_by_id(sessions_ht, session_id); | |
168 | if (!session) { | |
169 | DBG("Relay session %" PRIu64 " not found", session_id); | |
170 | ret = -1; | |
171 | goto error; | |
172 | } | |
173 | ||
174 | current_val = uatomic_cmpxchg(&session->new_streams, 1, 0); | |
175 | ret = current_val; | |
176 | ||
177 | error: | |
178 | return ret; | |
179 | } | |
180 | ||
181 | /* | |
182 | * Send viewer streams to the given socket. The ignore_sent_flag indicates if | |
183 | * this function should ignore the sent flag or not. | |
184 | * | |
185 | * Return 0 on success or else a negative value. | |
186 | */ | |
187 | static | |
188 | ssize_t send_viewer_streams(struct lttcomm_sock *sock, | |
189 | struct relay_session *session, unsigned int ignore_sent_flag) | |
190 | { | |
191 | ssize_t ret; | |
192 | struct lttng_viewer_stream send_stream; | |
193 | struct lttng_ht_iter iter; | |
194 | struct relay_viewer_stream *vstream; | |
195 | ||
196 | assert(session); | |
197 | ||
198 | rcu_read_lock(); | |
199 | ||
200 | cds_lfht_for_each_entry(viewer_streams_ht->ht, &iter.iter, vstream, | |
201 | stream_n.node) { | |
202 | health_code_update(); | |
203 | ||
204 | /* Ignore if not the same session. */ | |
205 | if (vstream->session_id != session->id || | |
206 | (!ignore_sent_flag && vstream->sent_flag)) { | |
207 | continue; | |
208 | } | |
209 | ||
210 | send_stream.id = htobe64(vstream->stream_handle); | |
211 | send_stream.ctf_trace_id = htobe64(vstream->ctf_trace->id); | |
212 | send_stream.metadata_flag = htobe32(vstream->metadata_flag); | |
213 | strncpy(send_stream.path_name, vstream->path_name, | |
214 | sizeof(send_stream.path_name)); | |
215 | strncpy(send_stream.channel_name, vstream->channel_name, | |
216 | sizeof(send_stream.channel_name)); | |
217 | ||
218 | DBG("Sending stream %" PRIu64 " to viewer", vstream->stream_handle); | |
219 | ret = send_response(sock, &send_stream, sizeof(send_stream)); | |
220 | if (ret < 0) { | |
221 | goto end_unlock; | |
222 | } | |
223 | vstream->sent_flag = 1; | |
224 | } | |
225 | ||
226 | ret = 0; | |
227 | ||
228 | end_unlock: | |
229 | rcu_read_unlock(); | |
230 | return ret; | |
231 | } | |
232 | ||
233 | /* | |
234 | * Create every viewer stream possible for the given session with the seek | |
235 | * type. Three counters *can* be return which are in order the total amount of | |
236 | * viewer stream of the session, the number of unsent stream and the number of | |
237 | * stream created. Those counters can be NULL and thus will be ignored. | |
238 | * | |
239 | * Return 0 on success or else a negative value. | |
240 | */ | |
241 | static | |
242 | int make_viewer_streams(struct relay_session *session, | |
243 | enum lttng_viewer_seek seek_t, uint32_t *nb_total, uint32_t *nb_unsent, | |
244 | uint32_t *nb_created) | |
245 | { | |
246 | int ret; | |
247 | struct relay_stream *stream; | |
248 | struct lttng_ht_iter iter; | |
249 | ||
250 | assert(session); | |
251 | ||
252 | /* | |
253 | * This is to make sure we create viewer streams for a full received | |
254 | * channel. For instance, if we have 8 streams for a channel that are | |
255 | * concurrently being flagged ready, we can end up creating just a subset | |
256 | * of the 8 streams (the ones that are flagged). This lock avoids this | |
257 | * limbo state. | |
258 | */ | |
259 | pthread_mutex_lock(&session->viewer_ready_lock); | |
260 | ||
261 | /* | |
262 | * Create viewer streams for relay streams that are ready to be used for a | |
263 | * the given session id only. | |
264 | */ | |
265 | cds_lfht_for_each_entry(relay_streams_ht->ht, &iter.iter, stream, | |
266 | stream_n.node) { | |
267 | struct relay_viewer_stream *vstream; | |
268 | ||
269 | health_code_update(); | |
270 | ||
271 | if (stream->session->id != session->id || | |
272 | !stream->ctf_trace || !stream->viewer_ready) { | |
273 | /* | |
274 | * Ignore stream from a different session. Don't create streams | |
275 | * with no ctf_trace or not ready for the viewer. | |
276 | */ | |
277 | continue; | |
278 | } | |
279 | ||
280 | vstream = viewer_stream_find_by_id(stream->stream_handle); | |
281 | if (!vstream) { | |
282 | vstream = viewer_stream_create(stream, seek_t); | |
283 | if (!vstream) { | |
284 | ret = -1; | |
285 | goto error_unlock; | |
286 | } | |
287 | if (nb_created) { | |
288 | /* Update number of created stream counter. */ | |
289 | (*nb_created)++; | |
290 | } | |
291 | } else if (!vstream->sent_flag && nb_unsent) { | |
292 | /* Update number of unsent stream counter. */ | |
293 | (*nb_unsent)++; | |
294 | } | |
295 | /* Update number of total stream counter. */ | |
296 | if (nb_total) { | |
297 | (*nb_total)++; | |
298 | } | |
299 | } | |
300 | ||
301 | ret = 0; | |
302 | ||
303 | error_unlock: | |
304 | pthread_mutex_unlock(&session->viewer_ready_lock); | |
305 | return ret; | |
306 | } | |
307 | ||
d3e2ba59 JD |
308 | /* |
309 | * Write to writable pipe used to notify a thread. | |
310 | */ | |
311 | static | |
312 | int notify_thread_pipe(int wpipe) | |
313 | { | |
6cd525e8 | 314 | ssize_t ret; |
d3e2ba59 | 315 | |
6cd525e8 MD |
316 | ret = lttng_write(wpipe, "!", 1); |
317 | if (ret < 1) { | |
d3e2ba59 JD |
318 | PERROR("write poll pipe"); |
319 | } | |
320 | ||
6cd525e8 | 321 | return (int) ret; |
d3e2ba59 JD |
322 | } |
323 | ||
324 | /* | |
325 | * Stop all threads by closing the thread quit pipe. | |
326 | */ | |
327 | static | |
328 | void stop_threads(void) | |
329 | { | |
330 | int ret; | |
331 | ||
332 | /* Stopping all threads */ | |
333 | DBG("Terminating all live threads"); | |
3557d456 | 334 | ret = notify_thread_pipe(thread_quit_pipe[1]); |
d3e2ba59 JD |
335 | if (ret < 0) { |
336 | ERR("write error on thread quit pipe"); | |
337 | } | |
338 | ||
339 | /* Dispatch thread */ | |
340 | CMM_STORE_SHARED(live_dispatch_thread_exit, 1); | |
341 | futex_nto1_wake(&viewer_cmd_queue.futex); | |
342 | } | |
343 | ||
d3e2ba59 JD |
344 | /* |
345 | * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set. | |
346 | */ | |
347 | static | |
348 | int create_thread_poll_set(struct lttng_poll_event *events, int size) | |
349 | { | |
350 | int ret; | |
351 | ||
352 | if (events == NULL || size == 0) { | |
353 | ret = -1; | |
354 | goto error; | |
355 | } | |
356 | ||
357 | ret = lttng_poll_create(events, size, LTTNG_CLOEXEC); | |
358 | if (ret < 0) { | |
359 | goto error; | |
360 | } | |
361 | ||
362 | /* Add quit pipe */ | |
3557d456 | 363 | ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN | LPOLLERR); |
d3e2ba59 JD |
364 | if (ret < 0) { |
365 | goto error; | |
366 | } | |
367 | ||
368 | return 0; | |
369 | ||
370 | error: | |
371 | return ret; | |
372 | } | |
373 | ||
374 | /* | |
375 | * Check if the thread quit pipe was triggered. | |
376 | * | |
377 | * Return 1 if it was triggered else 0; | |
378 | */ | |
379 | static | |
380 | int check_thread_quit_pipe(int fd, uint32_t events) | |
381 | { | |
3557d456 | 382 | if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) { |
d3e2ba59 JD |
383 | return 1; |
384 | } | |
385 | ||
386 | return 0; | |
387 | } | |
388 | ||
389 | /* | |
390 | * Create and init socket from uri. | |
391 | */ | |
392 | static | |
393 | struct lttcomm_sock *init_socket(struct lttng_uri *uri) | |
394 | { | |
395 | int ret; | |
396 | struct lttcomm_sock *sock = NULL; | |
397 | ||
398 | sock = lttcomm_alloc_sock_from_uri(uri); | |
399 | if (sock == NULL) { | |
400 | ERR("Allocating socket"); | |
401 | goto error; | |
402 | } | |
403 | ||
404 | ret = lttcomm_create_sock(sock); | |
405 | if (ret < 0) { | |
406 | goto error; | |
407 | } | |
408 | DBG("Listening on sock %d for live", sock->fd); | |
409 | ||
410 | ret = sock->ops->bind(sock); | |
411 | if (ret < 0) { | |
412 | goto error; | |
413 | } | |
414 | ||
415 | ret = sock->ops->listen(sock, -1); | |
416 | if (ret < 0) { | |
417 | goto error; | |
418 | ||
419 | } | |
420 | ||
421 | return sock; | |
422 | ||
423 | error: | |
424 | if (sock) { | |
425 | lttcomm_destroy_sock(sock); | |
426 | } | |
427 | return NULL; | |
428 | } | |
429 | ||
430 | /* | |
431 | * This thread manages the listening for new connections on the network | |
432 | */ | |
433 | static | |
434 | void *thread_listener(void *data) | |
435 | { | |
436 | int i, ret, pollfd, err = -1; | |
437 | int val = 1; | |
438 | uint32_t revents, nb_fd; | |
439 | struct lttng_poll_event events; | |
440 | struct lttcomm_sock *live_control_sock; | |
441 | ||
442 | DBG("[thread] Relay live listener started"); | |
443 | ||
eea7556c MD |
444 | health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_LISTENER); |
445 | ||
446 | health_code_update(); | |
447 | ||
d3e2ba59 JD |
448 | live_control_sock = init_socket(live_uri); |
449 | if (!live_control_sock) { | |
450 | goto error_sock_control; | |
451 | } | |
452 | ||
ed9fae09 | 453 | /* Pass 2 as size here for the thread quit pipe and control sockets. */ |
d3e2ba59 JD |
454 | ret = create_thread_poll_set(&events, 2); |
455 | if (ret < 0) { | |
456 | goto error_create_poll; | |
457 | } | |
458 | ||
459 | /* Add the control socket */ | |
460 | ret = lttng_poll_add(&events, live_control_sock->fd, LPOLLIN | LPOLLRDHUP); | |
461 | if (ret < 0) { | |
462 | goto error_poll_add; | |
463 | } | |
464 | ||
02a6bb53 MD |
465 | lttng_relay_notify_ready(); |
466 | ||
4e5b8b82 MD |
467 | if (testpoint(relayd_thread_live_listener)) { |
468 | goto error_testpoint; | |
469 | } | |
470 | ||
d3e2ba59 | 471 | while (1) { |
eea7556c MD |
472 | health_code_update(); |
473 | ||
d3e2ba59 JD |
474 | DBG("Listener accepting live viewers connections"); |
475 | ||
476 | restart: | |
eea7556c | 477 | health_poll_entry(); |
d3e2ba59 | 478 | ret = lttng_poll_wait(&events, -1); |
eea7556c | 479 | health_poll_exit(); |
d3e2ba59 JD |
480 | if (ret < 0) { |
481 | /* | |
482 | * Restart interrupted system call. | |
483 | */ | |
484 | if (errno == EINTR) { | |
485 | goto restart; | |
486 | } | |
487 | goto error; | |
488 | } | |
489 | nb_fd = ret; | |
490 | ||
491 | DBG("Relay new viewer connection received"); | |
492 | for (i = 0; i < nb_fd; i++) { | |
eea7556c MD |
493 | health_code_update(); |
494 | ||
d3e2ba59 JD |
495 | /* Fetch once the poll data */ |
496 | revents = LTTNG_POLL_GETEV(&events, i); | |
497 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
498 | ||
499 | /* Thread quit pipe has been closed. Killing thread. */ | |
500 | ret = check_thread_quit_pipe(pollfd, revents); | |
501 | if (ret) { | |
502 | err = 0; | |
503 | goto exit; | |
504 | } | |
505 | ||
506 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
507 | ERR("socket poll error"); | |
508 | goto error; | |
509 | } else if (revents & LPOLLIN) { | |
510 | /* | |
511 | * Get allocated in this thread, enqueued to a global queue, | |
512 | * dequeued and freed in the worker thread. | |
513 | */ | |
514 | struct relay_command *relay_cmd; | |
515 | struct lttcomm_sock *newsock; | |
516 | ||
517 | relay_cmd = zmalloc(sizeof(*relay_cmd)); | |
518 | if (!relay_cmd) { | |
519 | PERROR("relay command zmalloc"); | |
520 | goto error; | |
521 | } | |
522 | ||
523 | assert(pollfd == live_control_sock->fd); | |
524 | newsock = live_control_sock->ops->accept(live_control_sock); | |
525 | if (!newsock) { | |
526 | PERROR("accepting control sock"); | |
527 | free(relay_cmd); | |
528 | goto error; | |
529 | } | |
530 | DBG("Relay viewer connection accepted socket %d", newsock->fd); | |
531 | ret = setsockopt(newsock->fd, SOL_SOCKET, SO_REUSEADDR, &val, | |
532 | sizeof(int)); | |
533 | if (ret < 0) { | |
534 | PERROR("setsockopt inet"); | |
535 | lttcomm_destroy_sock(newsock); | |
536 | free(relay_cmd); | |
537 | goto error; | |
538 | } | |
539 | relay_cmd->sock = newsock; | |
540 | ||
541 | /* | |
542 | * Lock free enqueue the request. | |
543 | */ | |
544 | cds_wfq_enqueue(&viewer_cmd_queue.queue, &relay_cmd->node); | |
545 | ||
546 | /* | |
547 | * Wake the dispatch queue futex. Implicit memory | |
548 | * barrier with the exchange in cds_wfq_enqueue. | |
549 | */ | |
550 | futex_nto1_wake(&viewer_cmd_queue.futex); | |
551 | } | |
552 | } | |
553 | } | |
554 | ||
555 | exit: | |
556 | error: | |
557 | error_poll_add: | |
4e5b8b82 | 558 | error_testpoint: |
d3e2ba59 JD |
559 | lttng_poll_clean(&events); |
560 | error_create_poll: | |
561 | if (live_control_sock->fd >= 0) { | |
562 | ret = live_control_sock->ops->close(live_control_sock); | |
563 | if (ret) { | |
564 | PERROR("close"); | |
565 | } | |
566 | } | |
567 | lttcomm_destroy_sock(live_control_sock); | |
568 | error_sock_control: | |
569 | if (err) { | |
eea7556c | 570 | health_error(); |
d3e2ba59 JD |
571 | DBG("Live viewer listener thread exited with error"); |
572 | } | |
eea7556c | 573 | health_unregister(health_relayd); |
d3e2ba59 JD |
574 | DBG("Live viewer listener thread cleanup complete"); |
575 | stop_threads(); | |
576 | return NULL; | |
577 | } | |
578 | ||
579 | /* | |
580 | * This thread manages the dispatching of the requests to worker threads | |
581 | */ | |
582 | static | |
583 | void *thread_dispatcher(void *data) | |
584 | { | |
6cd525e8 MD |
585 | int err = -1; |
586 | ssize_t ret; | |
d3e2ba59 JD |
587 | struct cds_wfq_node *node; |
588 | struct relay_command *relay_cmd = NULL; | |
589 | ||
590 | DBG("[thread] Live viewer relay dispatcher started"); | |
591 | ||
eea7556c MD |
592 | health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_DISPATCHER); |
593 | ||
4e5b8b82 MD |
594 | if (testpoint(relayd_thread_live_dispatcher)) { |
595 | goto error_testpoint; | |
596 | } | |
597 | ||
eea7556c MD |
598 | health_code_update(); |
599 | ||
d3e2ba59 | 600 | while (!CMM_LOAD_SHARED(live_dispatch_thread_exit)) { |
eea7556c MD |
601 | health_code_update(); |
602 | ||
d3e2ba59 JD |
603 | /* Atomically prepare the queue futex */ |
604 | futex_nto1_prepare(&viewer_cmd_queue.futex); | |
605 | ||
606 | do { | |
eea7556c MD |
607 | health_code_update(); |
608 | ||
d3e2ba59 JD |
609 | /* Dequeue commands */ |
610 | node = cds_wfq_dequeue_blocking(&viewer_cmd_queue.queue); | |
611 | if (node == NULL) { | |
612 | DBG("Woken up but nothing in the live-viewer " | |
613 | "relay command queue"); | |
614 | /* Continue thread execution */ | |
615 | break; | |
616 | } | |
617 | ||
618 | relay_cmd = caa_container_of(node, struct relay_command, node); | |
619 | DBG("Dispatching viewer request waiting on sock %d", | |
620 | relay_cmd->sock->fd); | |
621 | ||
622 | /* | |
623 | * Inform worker thread of the new request. This call is blocking | |
624 | * so we can be assured that the data will be read at some point in | |
625 | * time or wait to the end of the world :) | |
626 | */ | |
6cd525e8 MD |
627 | ret = lttng_write(live_relay_cmd_pipe[1], relay_cmd, |
628 | sizeof(*relay_cmd)); | |
d3e2ba59 | 629 | free(relay_cmd); |
6cd525e8 | 630 | if (ret < sizeof(struct relay_command)) { |
d3e2ba59 JD |
631 | PERROR("write cmd pipe"); |
632 | goto error; | |
633 | } | |
634 | } while (node != NULL); | |
635 | ||
636 | /* Futex wait on queue. Blocking call on futex() */ | |
eea7556c | 637 | health_poll_entry(); |
d3e2ba59 | 638 | futex_nto1_wait(&viewer_cmd_queue.futex); |
eea7556c | 639 | health_poll_exit(); |
d3e2ba59 JD |
640 | } |
641 | ||
eea7556c MD |
642 | /* Normal exit, no error */ |
643 | err = 0; | |
644 | ||
d3e2ba59 | 645 | error: |
4e5b8b82 | 646 | error_testpoint: |
eea7556c MD |
647 | if (err) { |
648 | health_error(); | |
649 | ERR("Health error occurred in %s", __func__); | |
650 | } | |
651 | health_unregister(health_relayd); | |
d3e2ba59 JD |
652 | DBG("Live viewer dispatch thread dying"); |
653 | stop_threads(); | |
654 | return NULL; | |
655 | } | |
656 | ||
657 | /* | |
658 | * Establish connection with the viewer and check the versions. | |
659 | * | |
660 | * Return 0 on success or else negative value. | |
661 | */ | |
662 | static | |
663 | int viewer_connect(struct relay_command *cmd) | |
664 | { | |
665 | int ret; | |
666 | struct lttng_viewer_connect reply, msg; | |
667 | ||
668 | assert(cmd); | |
669 | ||
670 | cmd->version_check_done = 1; | |
671 | ||
eea7556c MD |
672 | health_code_update(); |
673 | ||
991adae2 DG |
674 | DBG("Viewer is establishing a connection to the relayd."); |
675 | ||
676 | ret = recv_request(cmd->sock, &msg, sizeof(msg)); | |
677 | if (ret < 0) { | |
d3e2ba59 JD |
678 | goto end; |
679 | } | |
680 | ||
eea7556c MD |
681 | health_code_update(); |
682 | ||
d3e2ba59 JD |
683 | reply.major = RELAYD_VERSION_COMM_MAJOR; |
684 | reply.minor = RELAYD_VERSION_COMM_MINOR; | |
685 | ||
686 | /* Major versions must be the same */ | |
687 | if (reply.major != be32toh(msg.major)) { | |
991adae2 DG |
688 | DBG("Incompatible major versions ([relayd] %u vs [client] %u)", |
689 | reply.major, be32toh(msg.major)); | |
72180669 | 690 | ret = -1; |
d3e2ba59 JD |
691 | goto end; |
692 | } | |
693 | ||
694 | cmd->major = reply.major; | |
695 | /* We adapt to the lowest compatible version */ | |
696 | if (reply.minor <= be32toh(msg.minor)) { | |
697 | cmd->minor = reply.minor; | |
698 | } else { | |
699 | cmd->minor = be32toh(msg.minor); | |
700 | } | |
701 | ||
702 | if (be32toh(msg.type) == VIEWER_CLIENT_COMMAND) { | |
703 | cmd->type = RELAY_VIEWER_COMMAND; | |
704 | } else if (be32toh(msg.type) == VIEWER_CLIENT_NOTIFICATION) { | |
705 | cmd->type = RELAY_VIEWER_NOTIFICATION; | |
706 | } else { | |
707 | ERR("Unknown connection type : %u", be32toh(msg.type)); | |
708 | ret = -1; | |
709 | goto end; | |
710 | } | |
711 | ||
712 | reply.major = htobe32(reply.major); | |
713 | reply.minor = htobe32(reply.minor); | |
714 | if (cmd->type == RELAY_VIEWER_COMMAND) { | |
715 | reply.viewer_session_id = htobe64(++last_relay_viewer_session_id); | |
716 | } | |
eea7556c MD |
717 | |
718 | health_code_update(); | |
719 | ||
991adae2 DG |
720 | |
721 | ret = send_response(cmd->sock, &reply, sizeof(reply)); | |
d3e2ba59 | 722 | if (ret < 0) { |
991adae2 | 723 | goto end; |
d3e2ba59 JD |
724 | } |
725 | ||
eea7556c MD |
726 | health_code_update(); |
727 | ||
d3e2ba59 JD |
728 | DBG("Version check done using protocol %u.%u", cmd->major, cmd->minor); |
729 | ret = 0; | |
730 | ||
731 | end: | |
732 | return ret; | |
733 | } | |
734 | ||
735 | /* | |
736 | * Send the viewer the list of current sessions. | |
737 | * | |
738 | * Return 0 on success or else a negative value. | |
739 | */ | |
740 | static | |
741 | int viewer_list_sessions(struct relay_command *cmd, | |
742 | struct lttng_ht *sessions_ht) | |
743 | { | |
744 | int ret; | |
745 | struct lttng_viewer_list_sessions session_list; | |
746 | unsigned long count; | |
747 | long approx_before, approx_after; | |
d3e2ba59 JD |
748 | struct lttng_ht_iter iter; |
749 | struct lttng_viewer_session send_session; | |
750 | struct relay_session *session; | |
751 | ||
752 | DBG("List sessions received"); | |
753 | ||
d3e2ba59 JD |
754 | rcu_read_lock(); |
755 | cds_lfht_count_nodes(sessions_ht->ht, &approx_before, &count, &approx_after); | |
756 | session_list.sessions_count = htobe32(count); | |
757 | ||
eea7556c MD |
758 | health_code_update(); |
759 | ||
991adae2 | 760 | ret = send_response(cmd->sock, &session_list, sizeof(session_list)); |
d3e2ba59 | 761 | if (ret < 0) { |
d3e2ba59 JD |
762 | goto end_unlock; |
763 | } | |
764 | ||
eea7556c MD |
765 | health_code_update(); |
766 | ||
991adae2 DG |
767 | cds_lfht_for_each_entry(sessions_ht->ht, &iter.iter, session, |
768 | session_n.node) { | |
eea7556c MD |
769 | health_code_update(); |
770 | ||
d3e2ba59 JD |
771 | strncpy(send_session.session_name, session->session_name, |
772 | sizeof(send_session.session_name)); | |
773 | strncpy(send_session.hostname, session->hostname, | |
774 | sizeof(send_session.hostname)); | |
775 | send_session.id = htobe64(session->id); | |
776 | send_session.live_timer = htobe32(session->live_timer); | |
777 | send_session.clients = htobe32(session->viewer_attached); | |
87b576ec | 778 | send_session.streams = htobe32(session->stream_count); |
d3e2ba59 | 779 | |
eea7556c MD |
780 | health_code_update(); |
781 | ||
991adae2 | 782 | ret = send_response(cmd->sock, &send_session, sizeof(send_session)); |
d3e2ba59 | 783 | if (ret < 0) { |
d3e2ba59 JD |
784 | goto end_unlock; |
785 | } | |
786 | } | |
eea7556c MD |
787 | health_code_update(); |
788 | ||
d3e2ba59 JD |
789 | rcu_read_unlock(); |
790 | ret = 0; | |
791 | goto end; | |
792 | ||
793 | end_unlock: | |
794 | rcu_read_unlock(); | |
795 | ||
796 | end: | |
d3e2ba59 JD |
797 | return ret; |
798 | } | |
799 | ||
091c3237 JD |
800 | /* |
801 | * Send the viewer the list of current sessions. | |
802 | */ | |
803 | static | |
804 | int viewer_get_new_streams(struct relay_command *cmd, | |
805 | struct lttng_ht *sessions_ht) | |
806 | { | |
807 | int ret, send_streams = 0; | |
991adae2 | 808 | uint32_t nb_created = 0, nb_unsent = 0, nb_streams = 0; |
091c3237 JD |
809 | struct lttng_viewer_new_streams_request request; |
810 | struct lttng_viewer_new_streams_response response; | |
091c3237 JD |
811 | struct relay_session *session; |
812 | ||
813 | assert(cmd); | |
814 | assert(sessions_ht); | |
815 | ||
816 | DBG("Get new streams received"); | |
817 | ||
091c3237 JD |
818 | health_code_update(); |
819 | ||
991adae2 DG |
820 | /* Receive the request from the connected client. */ |
821 | ret = recv_request(cmd->sock, &request, sizeof(request)); | |
822 | if (ret < 0) { | |
091c3237 JD |
823 | goto error; |
824 | } | |
825 | ||
826 | health_code_update(); | |
827 | ||
828 | rcu_read_lock(); | |
991adae2 DG |
829 | session = session_find_by_id(sessions_ht, be64toh(request.session_id)); |
830 | if (!session) { | |
091c3237 JD |
831 | DBG("Relay session %" PRIu64 " not found", |
832 | be64toh(request.session_id)); | |
833 | response.status = htobe32(VIEWER_NEW_STREAMS_ERR); | |
834 | goto send_reply; | |
835 | } | |
836 | ||
091c3237 JD |
837 | if (cmd->session_id == session->id) { |
838 | /* We confirmed the viewer is asking for the same session. */ | |
839 | send_streams = 1; | |
840 | response.status = htobe32(VIEWER_NEW_STREAMS_OK); | |
841 | } else { | |
842 | send_streams = 0; | |
843 | response.status = htobe32(VIEWER_NEW_STREAMS_ERR); | |
844 | goto send_reply; | |
845 | } | |
846 | ||
991adae2 DG |
847 | if (!send_streams) { |
848 | goto send_reply; | |
091c3237 | 849 | } |
091c3237 | 850 | |
991adae2 DG |
851 | ret = make_viewer_streams(session, VIEWER_SEEK_LAST, NULL, &nb_unsent, |
852 | &nb_created); | |
853 | if (ret < 0) { | |
854 | goto end_unlock; | |
855 | } | |
856 | /* Only send back the newly created streams with the unsent ones. */ | |
857 | nb_streams = nb_created + nb_unsent; | |
091c3237 JD |
858 | response.streams_count = htobe32(nb_streams); |
859 | ||
860 | send_reply: | |
861 | health_code_update(); | |
991adae2 | 862 | ret = send_response(cmd->sock, &response, sizeof(response)); |
091c3237 | 863 | if (ret < 0) { |
091c3237 JD |
864 | goto end_unlock; |
865 | } | |
866 | health_code_update(); | |
867 | ||
868 | /* | |
869 | * Unknown or empty session, just return gracefully, the viewer knows what | |
870 | * is happening. | |
871 | */ | |
872 | if (!send_streams || !nb_streams) { | |
873 | ret = 0; | |
874 | goto end_unlock; | |
875 | } | |
876 | ||
991adae2 DG |
877 | /* |
878 | * Send stream and *DON'T* ignore the sent flag so every viewer streams | |
879 | * that were not sent from that point will be sent to the viewer. | |
880 | */ | |
881 | ret = send_viewer_streams(cmd->sock, session, 0); | |
882 | if (ret < 0) { | |
883 | goto end_unlock; | |
091c3237 JD |
884 | } |
885 | ||
091c3237 JD |
886 | end_unlock: |
887 | rcu_read_unlock(); | |
091c3237 JD |
888 | error: |
889 | return ret; | |
890 | } | |
891 | ||
d3e2ba59 JD |
892 | /* |
893 | * Send the viewer the list of current sessions. | |
894 | */ | |
895 | static | |
896 | int viewer_attach_session(struct relay_command *cmd, | |
92c6ca54 | 897 | struct lttng_ht *sessions_ht) |
d3e2ba59 | 898 | { |
991adae2 DG |
899 | int send_streams = 0; |
900 | ssize_t ret; | |
091c3237 | 901 | uint32_t nb_streams = 0; |
991adae2 | 902 | enum lttng_viewer_seek seek_type; |
d3e2ba59 JD |
903 | struct lttng_viewer_attach_session_request request; |
904 | struct lttng_viewer_attach_session_response response; | |
d3e2ba59 JD |
905 | struct relay_session *session; |
906 | ||
907 | assert(cmd); | |
908 | assert(sessions_ht); | |
d3e2ba59 JD |
909 | |
910 | DBG("Attach session received"); | |
911 | ||
eea7556c MD |
912 | health_code_update(); |
913 | ||
991adae2 DG |
914 | /* Receive the request from the connected client. */ |
915 | ret = recv_request(cmd->sock, &request, sizeof(request)); | |
916 | if (ret < 0) { | |
d3e2ba59 JD |
917 | goto error; |
918 | } | |
919 | ||
eea7556c MD |
920 | health_code_update(); |
921 | ||
d3e2ba59 | 922 | rcu_read_lock(); |
991adae2 DG |
923 | session = session_find_by_id(sessions_ht, be64toh(request.session_id)); |
924 | if (!session) { | |
d3e2ba59 JD |
925 | DBG("Relay session %" PRIu64 " not found", |
926 | be64toh(request.session_id)); | |
927 | response.status = htobe32(VIEWER_ATTACH_UNK); | |
928 | goto send_reply; | |
929 | } | |
930 | ||
b92fdc2b | 931 | if (cmd->session_id == session->id) { |
d3e2ba59 JD |
932 | /* Same viewer already attached, just send the stream list. */ |
933 | send_streams = 1; | |
934 | response.status = htobe32(VIEWER_ATTACH_OK); | |
935 | } else if (session->viewer_attached != 0) { | |
936 | DBG("Already a viewer attached"); | |
937 | response.status = htobe32(VIEWER_ATTACH_ALREADY); | |
938 | goto send_reply; | |
939 | } else if (session->live_timer == 0) { | |
940 | DBG("Not live session"); | |
941 | response.status = htobe32(VIEWER_ATTACH_NOT_LIVE); | |
942 | goto send_reply; | |
943 | } else { | |
944 | session->viewer_attached++; | |
945 | send_streams = 1; | |
946 | response.status = htobe32(VIEWER_ATTACH_OK); | |
b92fdc2b | 947 | cmd->session_id = session->id; |
d3e2ba59 JD |
948 | cmd->session = session; |
949 | } | |
950 | ||
951 | switch (be32toh(request.seek)) { | |
952 | case VIEWER_SEEK_BEGINNING: | |
d3e2ba59 | 953 | case VIEWER_SEEK_LAST: |
991adae2 | 954 | seek_type = be32toh(request.seek); |
d3e2ba59 JD |
955 | break; |
956 | default: | |
957 | ERR("Wrong seek parameter"); | |
958 | response.status = htobe32(VIEWER_ATTACH_SEEK_ERR); | |
959 | send_streams = 0; | |
960 | goto send_reply; | |
961 | } | |
962 | ||
991adae2 DG |
963 | if (!send_streams) { |
964 | goto send_reply; | |
965 | } | |
814fcae4 | 966 | |
991adae2 DG |
967 | ret = make_viewer_streams(session, seek_type, &nb_streams, NULL, NULL); |
968 | if (ret < 0) { | |
969 | goto end_unlock; | |
d3e2ba59 | 970 | } |
991adae2 | 971 | response.streams_count = htobe32(nb_streams); |
d3e2ba59 JD |
972 | |
973 | send_reply: | |
eea7556c | 974 | health_code_update(); |
991adae2 | 975 | ret = send_response(cmd->sock, &response, sizeof(response)); |
d3e2ba59 | 976 | if (ret < 0) { |
d3e2ba59 JD |
977 | goto end_unlock; |
978 | } | |
eea7556c | 979 | health_code_update(); |
d3e2ba59 JD |
980 | |
981 | /* | |
157df586 | 982 | * Unknown or empty session, just return gracefully, the viewer knows what |
d3e2ba59 JD |
983 | * is happening. |
984 | */ | |
157df586 | 985 | if (!send_streams || !nb_streams) { |
d3e2ba59 JD |
986 | ret = 0; |
987 | goto end_unlock; | |
988 | } | |
989 | ||
991adae2 DG |
990 | /* Send stream and ignore the sent flag. */ |
991 | ret = send_viewer_streams(cmd->sock, session, 1); | |
992 | if (ret < 0) { | |
993 | goto end_unlock; | |
d3e2ba59 | 994 | } |
d3e2ba59 JD |
995 | |
996 | end_unlock: | |
997 | rcu_read_unlock(); | |
829007d9 JD |
998 | error: |
999 | return ret; | |
1000 | } | |
1001 | ||
d3e2ba59 JD |
1002 | /* |
1003 | * Send the next index for a stream. | |
1004 | * | |
1005 | * Return 0 on success or else a negative value. | |
1006 | */ | |
1007 | static | |
1008 | int viewer_get_next_index(struct relay_command *cmd, | |
92c6ca54 | 1009 | struct lttng_ht *sessions_ht) |
d3e2ba59 JD |
1010 | { |
1011 | int ret; | |
1012 | struct lttng_viewer_get_next_index request_index; | |
1013 | struct lttng_viewer_index viewer_index; | |
50adc264 | 1014 | struct ctf_packet_index packet_index; |
d3e2ba59 JD |
1015 | struct relay_viewer_stream *vstream; |
1016 | struct relay_stream *rstream; | |
1017 | ||
1018 | assert(cmd); | |
d3e2ba59 JD |
1019 | assert(sessions_ht); |
1020 | ||
1021 | DBG("Viewer get next index"); | |
1022 | ||
eea7556c | 1023 | health_code_update(); |
991adae2 DG |
1024 | |
1025 | ret = recv_request(cmd->sock, &request_index, sizeof(request_index)); | |
1026 | if (ret < 0) { | |
d3e2ba59 JD |
1027 | goto end; |
1028 | } | |
eea7556c | 1029 | health_code_update(); |
d3e2ba59 JD |
1030 | |
1031 | rcu_read_lock(); | |
991adae2 | 1032 | vstream = viewer_stream_find_by_id(be64toh(request_index.stream_id)); |
d3e2ba59 JD |
1033 | if (!vstream) { |
1034 | ret = -1; | |
1035 | goto end_unlock; | |
1036 | } | |
1037 | ||
1038 | memset(&viewer_index, 0, sizeof(viewer_index)); | |
1039 | ||
1040 | /* | |
1041 | * The viewer should not ask for index on metadata stream. | |
1042 | */ | |
1043 | if (vstream->metadata_flag) { | |
1044 | viewer_index.status = htobe32(VIEWER_INDEX_HUP); | |
1045 | goto send_reply; | |
1046 | } | |
1047 | ||
1048 | /* First time, we open the index file */ | |
1049 | if (vstream->index_read_fd < 0) { | |
991adae2 DG |
1050 | ret = index_open(vstream->path_name, vstream->channel_name, |
1051 | vstream->tracefile_count, vstream->tracefile_count_current); | |
0e6830aa | 1052 | if (ret == -ENOENT) { |
d3e2ba59 JD |
1053 | /* |
1054 | * The index is created only when the first data packet arrives, it | |
1055 | * might not be ready at the beginning of the session | |
1056 | */ | |
1057 | viewer_index.status = htobe32(VIEWER_INDEX_RETRY); | |
1058 | goto send_reply; | |
1059 | } else if (ret < 0) { | |
1060 | viewer_index.status = htobe32(VIEWER_INDEX_ERR); | |
1061 | goto send_reply; | |
1062 | } | |
991adae2 | 1063 | vstream->index_read_fd = ret; |
d3e2ba59 JD |
1064 | } |
1065 | ||
1066 | rstream = relay_stream_find_by_id(vstream->stream_handle); | |
1067 | if (rstream) { | |
6b6b9a5a JD |
1068 | if (vstream->abort_flag) { |
1069 | /* Rotate on abort (overwrite). */ | |
1070 | DBG("Viewer rotate because of overwrite"); | |
991adae2 | 1071 | ret = viewer_stream_rotate(vstream, rstream); |
6b6b9a5a JD |
1072 | if (ret < 0) { |
1073 | goto end_unlock; | |
a020f610 JD |
1074 | } else if (ret == 1) { |
1075 | viewer_index.status = htobe32(VIEWER_INDEX_HUP); | |
991adae2 DG |
1076 | viewer_stream_delete(vstream); |
1077 | viewer_stream_destroy(vstream); | |
a020f610 | 1078 | goto send_reply; |
6b6b9a5a JD |
1079 | } |
1080 | } | |
6b6b9a5a | 1081 | pthread_mutex_lock(&rstream->viewer_stream_rotation_lock); |
cef0f7d5 JD |
1082 | if (rstream->tracefile_count_current == vstream->tracefile_count_current) { |
1083 | if (rstream->beacon_ts_end != -1ULL && | |
1084 | vstream->last_sent_index == rstream->total_index_received) { | |
1085 | viewer_index.status = htobe32(VIEWER_INDEX_INACTIVE); | |
1086 | viewer_index.timestamp_end = htobe64(rstream->beacon_ts_end); | |
1087 | pthread_mutex_unlock(&rstream->viewer_stream_rotation_lock); | |
1088 | goto send_reply; | |
1089 | /* | |
1090 | * Reader and writer are working in the same tracefile, so we care | |
1091 | * about the number of index received and sent. Otherwise, we read | |
1092 | * up to EOF. | |
1093 | */ | |
1094 | } else if (rstream->total_index_received <= vstream->last_sent_index | |
1095 | && !vstream->close_write_flag) { | |
1096 | pthread_mutex_unlock(&rstream->viewer_stream_rotation_lock); | |
1097 | /* No new index to send, retry later. */ | |
1098 | viewer_index.status = htobe32(VIEWER_INDEX_RETRY); | |
1099 | goto send_reply; | |
1100 | } | |
d3e2ba59 | 1101 | } |
6b6b9a5a JD |
1102 | pthread_mutex_unlock(&rstream->viewer_stream_rotation_lock); |
1103 | } else if (!rstream && vstream->close_write_flag && | |
d3e2ba59 | 1104 | vstream->total_index_received == vstream->last_sent_index) { |
6b6b9a5a | 1105 | /* Last index sent and current tracefile closed in write */ |
d3e2ba59 | 1106 | viewer_index.status = htobe32(VIEWER_INDEX_HUP); |
991adae2 DG |
1107 | viewer_stream_delete(vstream); |
1108 | viewer_stream_destroy(vstream); | |
d3e2ba59 | 1109 | goto send_reply; |
6b6b9a5a JD |
1110 | } else { |
1111 | vstream->close_write_flag = 1; | |
d3e2ba59 JD |
1112 | } |
1113 | ||
1114 | if (!vstream->ctf_trace->metadata_received || | |
1115 | vstream->ctf_trace->metadata_received > | |
1116 | vstream->ctf_trace->metadata_sent) { | |
1117 | viewer_index.flags |= LTTNG_VIEWER_FLAG_NEW_METADATA; | |
1118 | } | |
1119 | ||
829007d9 JD |
1120 | ret = check_new_streams(vstream->session_id, sessions_ht); |
1121 | if (ret < 0) { | |
1122 | goto end_unlock; | |
1123 | } else if (ret == 1) { | |
1124 | viewer_index.flags |= LTTNG_VIEWER_FLAG_NEW_STREAM; | |
1125 | } | |
1126 | ||
cef0f7d5 JD |
1127 | pthread_mutex_lock(&vstream->overwrite_lock); |
1128 | if (vstream->abort_flag) { | |
1129 | /* | |
1130 | * The file is being overwritten by the writer, we cannot | |
1131 | * use it. | |
1132 | */ | |
1133 | viewer_index.status = htobe32(VIEWER_INDEX_RETRY); | |
1134 | pthread_mutex_unlock(&vstream->overwrite_lock); | |
991adae2 | 1135 | ret = viewer_stream_rotate(vstream, rstream); |
cef0f7d5 JD |
1136 | if (ret < 0) { |
1137 | goto end_unlock; | |
a020f610 JD |
1138 | } else if (ret == 1) { |
1139 | viewer_index.status = htobe32(VIEWER_INDEX_HUP); | |
991adae2 DG |
1140 | viewer_stream_delete(vstream); |
1141 | viewer_stream_destroy(vstream); | |
a020f610 | 1142 | goto send_reply; |
cef0f7d5 JD |
1143 | } |
1144 | goto send_reply; | |
1145 | } | |
991adae2 | 1146 | |
6cd525e8 MD |
1147 | ret = lttng_read(vstream->index_read_fd, &packet_index, |
1148 | sizeof(packet_index)); | |
cef0f7d5 | 1149 | pthread_mutex_unlock(&vstream->overwrite_lock); |
d3e2ba59 | 1150 | if (ret < sizeof(packet_index)) { |
6b6b9a5a JD |
1151 | /* |
1152 | * The tracefile is closed in write, so we read up to EOF. | |
1153 | */ | |
1154 | if (vstream->close_write_flag == 1) { | |
1155 | viewer_index.status = htobe32(VIEWER_INDEX_RETRY); | |
1156 | /* Rotate on normal EOF */ | |
991adae2 | 1157 | ret = viewer_stream_rotate(vstream, rstream); |
6b6b9a5a JD |
1158 | if (ret < 0) { |
1159 | goto end_unlock; | |
a020f610 JD |
1160 | } else if (ret == 1) { |
1161 | viewer_index.status = htobe32(VIEWER_INDEX_HUP); | |
991adae2 DG |
1162 | viewer_stream_delete(vstream); |
1163 | viewer_stream_destroy(vstream); | |
a020f610 | 1164 | goto send_reply; |
6b6b9a5a JD |
1165 | } |
1166 | } else { | |
991adae2 | 1167 | PERROR("Relay reading index file %d", vstream->index_read_fd); |
cef0f7d5 | 1168 | viewer_index.status = htobe32(VIEWER_INDEX_ERR); |
6b6b9a5a JD |
1169 | } |
1170 | goto send_reply; | |
d3e2ba59 JD |
1171 | } else { |
1172 | viewer_index.status = htobe32(VIEWER_INDEX_OK); | |
1173 | vstream->last_sent_index++; | |
1174 | } | |
1175 | ||
1176 | /* | |
1177 | * Indexes are stored in big endian, no need to switch before sending. | |
1178 | */ | |
1179 | viewer_index.offset = packet_index.offset; | |
1180 | viewer_index.packet_size = packet_index.packet_size; | |
1181 | viewer_index.content_size = packet_index.content_size; | |
1182 | viewer_index.timestamp_begin = packet_index.timestamp_begin; | |
1183 | viewer_index.timestamp_end = packet_index.timestamp_end; | |
1184 | viewer_index.events_discarded = packet_index.events_discarded; | |
1185 | viewer_index.stream_id = packet_index.stream_id; | |
1186 | ||
1187 | send_reply: | |
1188 | viewer_index.flags = htobe32(viewer_index.flags); | |
eea7556c | 1189 | health_code_update(); |
991adae2 DG |
1190 | |
1191 | ret = send_response(cmd->sock, &viewer_index, sizeof(viewer_index)); | |
d3e2ba59 | 1192 | if (ret < 0) { |
d3e2ba59 JD |
1193 | goto end_unlock; |
1194 | } | |
eea7556c | 1195 | health_code_update(); |
d3e2ba59 | 1196 | |
991adae2 | 1197 | DBG("Index %" PRIu64 " for stream %" PRIu64 " sent", |
d3e2ba59 JD |
1198 | vstream->last_sent_index, vstream->stream_handle); |
1199 | ||
1200 | end_unlock: | |
1201 | rcu_read_unlock(); | |
1202 | ||
d3e2ba59 JD |
1203 | end: |
1204 | return ret; | |
1205 | } | |
1206 | ||
1207 | /* | |
1208 | * Send the next index for a stream | |
1209 | * | |
1210 | * Return 0 on success or else a negative value. | |
1211 | */ | |
1212 | static | |
829007d9 JD |
1213 | int viewer_get_packet(struct relay_command *cmd, |
1214 | struct lttng_ht *sessions_ht) | |
d3e2ba59 JD |
1215 | { |
1216 | int ret, send_data = 0; | |
1217 | char *data = NULL; | |
1218 | uint32_t len = 0; | |
1219 | ssize_t read_len; | |
1220 | struct lttng_viewer_get_packet get_packet_info; | |
1221 | struct lttng_viewer_trace_packet reply; | |
1222 | struct relay_viewer_stream *stream; | |
1223 | ||
1224 | assert(cmd); | |
d3e2ba59 JD |
1225 | |
1226 | DBG2("Relay get data packet"); | |
1227 | ||
eea7556c | 1228 | health_code_update(); |
991adae2 DG |
1229 | |
1230 | ret = recv_request(cmd->sock, &get_packet_info, sizeof(get_packet_info)); | |
1231 | if (ret < 0) { | |
d3e2ba59 JD |
1232 | goto end; |
1233 | } | |
eea7556c | 1234 | health_code_update(); |
d3e2ba59 | 1235 | |
0233a6a5 DG |
1236 | /* From this point on, the error label can be reached. */ |
1237 | memset(&reply, 0, sizeof(reply)); | |
1238 | ||
d3e2ba59 | 1239 | rcu_read_lock(); |
991adae2 | 1240 | stream = viewer_stream_find_by_id(be64toh(get_packet_info.stream_id)); |
d3e2ba59 JD |
1241 | if (!stream) { |
1242 | goto error; | |
1243 | } | |
1244 | assert(stream->ctf_trace); | |
1245 | ||
1246 | /* | |
1247 | * First time we read this stream, we need open the tracefile, we should | |
1248 | * only arrive here if an index has already been sent to the viewer, so the | |
1249 | * tracefile must exist, if it does not it is a fatal error. | |
1250 | */ | |
1251 | if (stream->read_fd < 0) { | |
1252 | char fullpath[PATH_MAX]; | |
1253 | ||
6b6b9a5a JD |
1254 | if (stream->tracefile_count > 0) { |
1255 | ret = snprintf(fullpath, PATH_MAX, "%s/%s_%" PRIu64, stream->path_name, | |
1256 | stream->channel_name, | |
1257 | stream->tracefile_count_current); | |
1258 | } else { | |
1259 | ret = snprintf(fullpath, PATH_MAX, "%s/%s", stream->path_name, | |
1260 | stream->channel_name); | |
1261 | } | |
d3e2ba59 JD |
1262 | if (ret < 0) { |
1263 | goto error; | |
1264 | } | |
1265 | ret = open(fullpath, O_RDONLY); | |
1266 | if (ret < 0) { | |
1267 | PERROR("Relay opening trace file"); | |
1268 | goto error; | |
1269 | } | |
1270 | stream->read_fd = ret; | |
1271 | } | |
1272 | ||
d3e2ba59 JD |
1273 | if (!stream->ctf_trace->metadata_received || |
1274 | stream->ctf_trace->metadata_received > | |
1275 | stream->ctf_trace->metadata_sent) { | |
1276 | reply.status = htobe32(VIEWER_GET_PACKET_ERR); | |
1277 | reply.flags |= LTTNG_VIEWER_FLAG_NEW_METADATA; | |
d3e2ba59 JD |
1278 | goto send_reply; |
1279 | } | |
1280 | ||
829007d9 JD |
1281 | ret = check_new_streams(stream->session_id, sessions_ht); |
1282 | if (ret < 0) { | |
1283 | goto end_unlock; | |
1284 | } else if (ret == 1) { | |
1285 | reply.status = htobe32(VIEWER_GET_PACKET_ERR); | |
1286 | reply.flags |= LTTNG_VIEWER_FLAG_NEW_STREAM; | |
1287 | goto send_reply; | |
1288 | } | |
1289 | ||
d3e2ba59 JD |
1290 | len = be32toh(get_packet_info.len); |
1291 | data = zmalloc(len); | |
1292 | if (!data) { | |
1293 | PERROR("relay data zmalloc"); | |
1294 | goto error; | |
1295 | } | |
1296 | ||
1297 | ret = lseek(stream->read_fd, be64toh(get_packet_info.offset), SEEK_SET); | |
1298 | if (ret < 0) { | |
6b6b9a5a JD |
1299 | /* |
1300 | * If the read fd was closed by the streaming side, the | |
1301 | * abort_flag will be set to 1, otherwise it is an error. | |
1302 | */ | |
1303 | if (stream->abort_flag == 0) { | |
1304 | PERROR("lseek"); | |
1305 | goto error; | |
1306 | } | |
1307 | reply.status = htobe32(VIEWER_GET_PACKET_EOF); | |
1308 | goto send_reply; | |
d3e2ba59 | 1309 | } |
6cd525e8 MD |
1310 | read_len = lttng_read(stream->read_fd, data, len); |
1311 | if (read_len < len) { | |
6b6b9a5a JD |
1312 | /* |
1313 | * If the read fd was closed by the streaming side, the | |
1314 | * abort_flag will be set to 1, otherwise it is an error. | |
1315 | */ | |
1316 | if (stream->abort_flag == 0) { | |
1317 | PERROR("Relay reading trace file, fd: %d, offset: %" PRIu64, | |
1318 | stream->read_fd, | |
1319 | be64toh(get_packet_info.offset)); | |
1320 | goto error; | |
1321 | } else { | |
1322 | reply.status = htobe32(VIEWER_GET_PACKET_EOF); | |
1323 | goto send_reply; | |
1324 | } | |
d3e2ba59 JD |
1325 | } |
1326 | reply.status = htobe32(VIEWER_GET_PACKET_OK); | |
1327 | reply.len = htobe32(len); | |
1328 | send_data = 1; | |
1329 | goto send_reply; | |
1330 | ||
1331 | error: | |
1332 | reply.status = htobe32(VIEWER_GET_PACKET_ERR); | |
1333 | ||
1334 | send_reply: | |
1335 | reply.flags = htobe32(reply.flags); | |
eea7556c MD |
1336 | |
1337 | health_code_update(); | |
991adae2 DG |
1338 | |
1339 | ret = send_response(cmd->sock, &reply, sizeof(reply)); | |
d3e2ba59 | 1340 | if (ret < 0) { |
d3e2ba59 JD |
1341 | goto end_unlock; |
1342 | } | |
eea7556c | 1343 | health_code_update(); |
d3e2ba59 JD |
1344 | |
1345 | if (send_data) { | |
eea7556c | 1346 | health_code_update(); |
991adae2 | 1347 | ret = send_response(cmd->sock, data, len); |
d3e2ba59 | 1348 | if (ret < 0) { |
d3e2ba59 JD |
1349 | goto end_unlock; |
1350 | } | |
eea7556c | 1351 | health_code_update(); |
d3e2ba59 JD |
1352 | } |
1353 | ||
1354 | DBG("Sent %u bytes for stream %" PRIu64, len, | |
1355 | be64toh(get_packet_info.stream_id)); | |
1356 | ||
1357 | end_unlock: | |
1358 | free(data); | |
1359 | rcu_read_unlock(); | |
1360 | ||
1361 | end: | |
1362 | return ret; | |
1363 | } | |
1364 | ||
1365 | /* | |
1366 | * Send the session's metadata | |
1367 | * | |
1368 | * Return 0 on success else a negative value. | |
1369 | */ | |
1370 | static | |
92c6ca54 | 1371 | int viewer_get_metadata(struct relay_command *cmd) |
d3e2ba59 JD |
1372 | { |
1373 | int ret = 0; | |
1374 | ssize_t read_len; | |
1375 | uint64_t len = 0; | |
1376 | char *data = NULL; | |
1377 | struct lttng_viewer_get_metadata request; | |
1378 | struct lttng_viewer_metadata_packet reply; | |
1379 | struct relay_viewer_stream *stream; | |
1380 | ||
1381 | assert(cmd); | |
d3e2ba59 JD |
1382 | |
1383 | DBG("Relay get metadata"); | |
1384 | ||
eea7556c | 1385 | health_code_update(); |
991adae2 DG |
1386 | |
1387 | ret = recv_request(cmd->sock, &request, sizeof(request)); | |
1388 | if (ret < 0) { | |
d3e2ba59 JD |
1389 | goto end; |
1390 | } | |
eea7556c | 1391 | health_code_update(); |
d3e2ba59 JD |
1392 | |
1393 | rcu_read_lock(); | |
991adae2 | 1394 | stream = viewer_stream_find_by_id(be64toh(request.stream_id)); |
d3e2ba59 JD |
1395 | if (!stream || !stream->metadata_flag) { |
1396 | ERR("Invalid metadata stream"); | |
1397 | goto error; | |
1398 | } | |
1399 | assert(stream->ctf_trace); | |
1400 | assert(stream->ctf_trace->metadata_sent <= | |
1401 | stream->ctf_trace->metadata_received); | |
1402 | ||
1403 | len = stream->ctf_trace->metadata_received - | |
1404 | stream->ctf_trace->metadata_sent; | |
1405 | if (len == 0) { | |
1406 | reply.status = htobe32(VIEWER_NO_NEW_METADATA); | |
1407 | goto send_reply; | |
1408 | } | |
1409 | ||
1410 | /* first time, we open the metadata file */ | |
1411 | if (stream->read_fd < 0) { | |
1412 | char fullpath[PATH_MAX]; | |
1413 | ||
1414 | ret = snprintf(fullpath, PATH_MAX, "%s/%s", stream->path_name, | |
1415 | stream->channel_name); | |
1416 | if (ret < 0) { | |
1417 | goto error; | |
1418 | } | |
1419 | ret = open(fullpath, O_RDONLY); | |
1420 | if (ret < 0) { | |
1421 | PERROR("Relay opening metadata file"); | |
1422 | goto error; | |
1423 | } | |
1424 | stream->read_fd = ret; | |
1425 | } | |
1426 | ||
1427 | reply.len = htobe64(len); | |
1428 | data = zmalloc(len); | |
1429 | if (!data) { | |
1430 | PERROR("viewer metadata zmalloc"); | |
1431 | goto error; | |
1432 | } | |
1433 | ||
6cd525e8 MD |
1434 | read_len = lttng_read(stream->read_fd, data, len); |
1435 | if (read_len < len) { | |
d3e2ba59 JD |
1436 | PERROR("Relay reading metadata file"); |
1437 | goto error; | |
1438 | } | |
1439 | stream->ctf_trace->metadata_sent += read_len; | |
1440 | reply.status = htobe32(VIEWER_METADATA_OK); | |
1441 | goto send_reply; | |
1442 | ||
1443 | error: | |
1444 | reply.status = htobe32(VIEWER_METADATA_ERR); | |
1445 | ||
1446 | send_reply: | |
eea7556c | 1447 | health_code_update(); |
991adae2 | 1448 | ret = send_response(cmd->sock, &reply, sizeof(reply)); |
d3e2ba59 | 1449 | if (ret < 0) { |
d3e2ba59 JD |
1450 | goto end_unlock; |
1451 | } | |
eea7556c | 1452 | health_code_update(); |
d3e2ba59 JD |
1453 | |
1454 | if (len > 0) { | |
991adae2 | 1455 | ret = send_response(cmd->sock, data, len); |
d3e2ba59 | 1456 | if (ret < 0) { |
d3e2ba59 JD |
1457 | goto end_unlock; |
1458 | } | |
1459 | } | |
1460 | ||
1461 | DBG("Sent %" PRIu64 " bytes of metadata for stream %" PRIu64, len, | |
1462 | be64toh(request.stream_id)); | |
1463 | ||
1464 | DBG("Metadata sent"); | |
1465 | ||
1466 | end_unlock: | |
1467 | free(data); | |
1468 | rcu_read_unlock(); | |
1469 | end: | |
1470 | return ret; | |
1471 | } | |
1472 | ||
1473 | /* | |
1474 | * live_relay_unknown_command: send -1 if received unknown command | |
1475 | */ | |
1476 | static | |
1477 | void live_relay_unknown_command(struct relay_command *cmd) | |
1478 | { | |
1479 | struct lttcomm_relayd_generic_reply reply; | |
d3e2ba59 JD |
1480 | |
1481 | reply.ret_code = htobe32(LTTNG_ERR_UNK); | |
991adae2 | 1482 | (void) send_response(cmd->sock, &reply, sizeof(reply)); |
d3e2ba59 JD |
1483 | } |
1484 | ||
1485 | /* | |
1486 | * Process the commands received on the control socket | |
1487 | */ | |
1488 | static | |
1489 | int process_control(struct lttng_viewer_cmd *recv_hdr, | |
92c6ca54 | 1490 | struct relay_command *cmd, struct lttng_ht *sessions_ht) |
d3e2ba59 JD |
1491 | { |
1492 | int ret = 0; | |
991adae2 DG |
1493 | uint32_t msg_value; |
1494 | ||
1495 | assert(recv_hdr); | |
1496 | assert(cmd); | |
1497 | assert(sessions_ht); | |
1498 | ||
1499 | msg_value = be32toh(recv_hdr->cmd); | |
1500 | ||
1501 | /* | |
1502 | * Make sure we've done the version check before any command other then a | |
1503 | * new client connection. | |
1504 | */ | |
1505 | if (msg_value != VIEWER_CONNECT && !cmd->version_check_done) { | |
1506 | ERR("Viewer cmd value %" PRIu32 " before version check", msg_value); | |
1507 | ret = -1; | |
1508 | goto end; | |
1509 | } | |
d3e2ba59 | 1510 | |
991adae2 | 1511 | switch (msg_value) { |
d3e2ba59 JD |
1512 | case VIEWER_CONNECT: |
1513 | ret = viewer_connect(cmd); | |
1514 | break; | |
1515 | case VIEWER_LIST_SESSIONS: | |
1516 | ret = viewer_list_sessions(cmd, sessions_ht); | |
1517 | break; | |
1518 | case VIEWER_ATTACH_SESSION: | |
92c6ca54 | 1519 | ret = viewer_attach_session(cmd, sessions_ht); |
d3e2ba59 JD |
1520 | break; |
1521 | case VIEWER_GET_NEXT_INDEX: | |
92c6ca54 | 1522 | ret = viewer_get_next_index(cmd, sessions_ht); |
d3e2ba59 JD |
1523 | break; |
1524 | case VIEWER_GET_PACKET: | |
829007d9 | 1525 | ret = viewer_get_packet(cmd, sessions_ht); |
d3e2ba59 JD |
1526 | break; |
1527 | case VIEWER_GET_METADATA: | |
92c6ca54 | 1528 | ret = viewer_get_metadata(cmd); |
d3e2ba59 | 1529 | break; |
091c3237 JD |
1530 | case VIEWER_GET_NEW_STREAMS: |
1531 | ret = viewer_get_new_streams(cmd, sessions_ht); | |
1532 | break; | |
d3e2ba59 JD |
1533 | default: |
1534 | ERR("Received unknown viewer command (%u)", be32toh(recv_hdr->cmd)); | |
1535 | live_relay_unknown_command(cmd); | |
1536 | ret = -1; | |
1537 | goto end; | |
1538 | } | |
1539 | ||
1540 | end: | |
1541 | return ret; | |
1542 | } | |
1543 | ||
1544 | static | |
1545 | void cleanup_poll_connection(struct lttng_poll_event *events, int pollfd) | |
1546 | { | |
1547 | int ret; | |
1548 | ||
1549 | assert(events); | |
1550 | ||
1551 | lttng_poll_del(events, pollfd); | |
1552 | ||
1553 | ret = close(pollfd); | |
1554 | if (ret < 0) { | |
1555 | ERR("Closing pollfd %d", pollfd); | |
1556 | } | |
1557 | } | |
1558 | ||
1559 | /* | |
1560 | * Create and add connection to the given hash table. | |
1561 | * | |
1562 | * Return poll add value or else -1 on error. | |
1563 | */ | |
1564 | static | |
1565 | int add_connection(int fd, struct lttng_poll_event *events, | |
1566 | struct lttng_ht *relay_connections_ht) | |
1567 | { | |
1568 | int ret; | |
1569 | struct relay_command *relay_connection; | |
1570 | ||
1571 | assert(events); | |
1572 | assert(relay_connections_ht); | |
1573 | ||
1574 | relay_connection = zmalloc(sizeof(struct relay_command)); | |
1575 | if (relay_connection == NULL) { | |
1576 | PERROR("Relay command zmalloc"); | |
1577 | goto error; | |
1578 | } | |
1579 | ||
6cd525e8 MD |
1580 | ret = lttng_read(fd, relay_connection, sizeof(*relay_connection)); |
1581 | if (ret < sizeof(*relay_connection)) { | |
d3e2ba59 JD |
1582 | PERROR("read relay cmd pipe"); |
1583 | goto error_read; | |
1584 | } | |
1585 | ||
1586 | lttng_ht_node_init_ulong(&relay_connection->sock_n, | |
1587 | (unsigned long) relay_connection->sock->fd); | |
1588 | rcu_read_lock(); | |
1589 | lttng_ht_add_unique_ulong(relay_connections_ht, | |
1590 | &relay_connection->sock_n); | |
1591 | rcu_read_unlock(); | |
1592 | ||
1593 | return lttng_poll_add(events, relay_connection->sock->fd, | |
1594 | LPOLLIN | LPOLLRDHUP); | |
1595 | ||
1596 | error_read: | |
1597 | free(relay_connection); | |
1598 | error: | |
1599 | return -1; | |
1600 | } | |
1601 | ||
1602 | static | |
1603 | void deferred_free_connection(struct rcu_head *head) | |
1604 | { | |
1605 | struct relay_command *relay_connection = | |
1606 | caa_container_of(head, struct relay_command, rcu_node); | |
1607 | ||
1608 | if (relay_connection->session && | |
1609 | relay_connection->session->viewer_attached > 0) { | |
1610 | relay_connection->session->viewer_attached--; | |
1611 | } | |
1612 | lttcomm_destroy_sock(relay_connection->sock); | |
1613 | free(relay_connection); | |
1614 | } | |
1615 | ||
157df586 JD |
1616 | /* |
1617 | * Delete all streams for a specific session ID. | |
1618 | */ | |
d3e2ba59 | 1619 | static |
b92fdc2b | 1620 | void viewer_del_streams(uint64_t session_id) |
d3e2ba59 | 1621 | { |
d3e2ba59 | 1622 | struct relay_viewer_stream *stream; |
d3e2ba59 JD |
1623 | struct lttng_ht_iter iter; |
1624 | ||
d3e2ba59 | 1625 | rcu_read_lock(); |
157df586 JD |
1626 | cds_lfht_for_each_entry(viewer_streams_ht->ht, &iter.iter, stream, |
1627 | stream_n.node) { | |
eea7556c MD |
1628 | health_code_update(); |
1629 | ||
b92fdc2b | 1630 | if (stream->session_id != session_id) { |
d3e2ba59 JD |
1631 | continue; |
1632 | } | |
1633 | ||
991adae2 | 1634 | viewer_stream_delete(stream); |
157df586 JD |
1635 | assert(stream->ctf_trace); |
1636 | ||
1637 | if (stream->metadata_flag) { | |
1638 | /* | |
1639 | * The metadata viewer stream is destroyed once the refcount on the | |
1640 | * ctf trace goes to 0 in the destroy stream function thus there is | |
1641 | * no explicit call to that function here. | |
1642 | */ | |
d3e2ba59 | 1643 | stream->ctf_trace->metadata_sent = 0; |
157df586 JD |
1644 | stream->ctf_trace->viewer_metadata_stream = NULL; |
1645 | } else { | |
991adae2 | 1646 | viewer_stream_destroy(stream); |
d3e2ba59 | 1647 | } |
d3e2ba59 JD |
1648 | } |
1649 | rcu_read_unlock(); | |
1650 | } | |
1651 | ||
1652 | /* | |
1653 | * Delete and free a connection. | |
1654 | * | |
1655 | * RCU read side lock MUST be acquired. | |
1656 | */ | |
1657 | static | |
1658 | void del_connection(struct lttng_ht *relay_connections_ht, | |
92c6ca54 | 1659 | struct lttng_ht_iter *iter, struct relay_command *relay_connection) |
d3e2ba59 JD |
1660 | { |
1661 | int ret; | |
1662 | ||
1663 | assert(relay_connections_ht); | |
1664 | assert(iter); | |
1665 | assert(relay_connection); | |
d3e2ba59 | 1666 | |
157df586 JD |
1667 | DBG("Cleaning connection of session ID %" PRIu64, |
1668 | relay_connection->session_id); | |
1669 | ||
d3e2ba59 JD |
1670 | ret = lttng_ht_del(relay_connections_ht, iter); |
1671 | assert(!ret); | |
1672 | ||
b92fdc2b | 1673 | viewer_del_streams(relay_connection->session_id); |
d3e2ba59 JD |
1674 | |
1675 | call_rcu(&relay_connection->rcu_node, deferred_free_connection); | |
1676 | } | |
1677 | ||
1678 | /* | |
1679 | * This thread does the actual work | |
1680 | */ | |
1681 | static | |
1682 | void *thread_worker(void *data) | |
1683 | { | |
1684 | int ret, err = -1; | |
1685 | uint32_t nb_fd; | |
1686 | struct relay_command *relay_connection; | |
1687 | struct lttng_poll_event events; | |
1688 | struct lttng_ht *relay_connections_ht; | |
1689 | struct lttng_ht_node_ulong *node; | |
1690 | struct lttng_ht_iter iter; | |
1691 | struct lttng_viewer_cmd recv_hdr; | |
1692 | struct relay_local_data *relay_ctx = (struct relay_local_data *) data; | |
1693 | struct lttng_ht *sessions_ht = relay_ctx->sessions_ht; | |
d3e2ba59 JD |
1694 | |
1695 | DBG("[thread] Live viewer relay worker started"); | |
1696 | ||
1697 | rcu_register_thread(); | |
1698 | ||
eea7556c MD |
1699 | health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_WORKER); |
1700 | ||
4e5b8b82 MD |
1701 | if (testpoint(relayd_thread_live_worker)) { |
1702 | goto error_testpoint; | |
1703 | } | |
1704 | ||
d3e2ba59 JD |
1705 | /* table of connections indexed on socket */ |
1706 | relay_connections_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); | |
1707 | if (!relay_connections_ht) { | |
1708 | goto relay_connections_ht_error; | |
1709 | } | |
1710 | ||
1711 | ret = create_thread_poll_set(&events, 2); | |
1712 | if (ret < 0) { | |
1713 | goto error_poll_create; | |
1714 | } | |
1715 | ||
1716 | ret = lttng_poll_add(&events, live_relay_cmd_pipe[0], LPOLLIN | LPOLLRDHUP); | |
1717 | if (ret < 0) { | |
1718 | goto error; | |
1719 | } | |
1720 | ||
1721 | restart: | |
1722 | while (1) { | |
1723 | int i; | |
1724 | ||
eea7556c MD |
1725 | health_code_update(); |
1726 | ||
d3e2ba59 JD |
1727 | /* Infinite blocking call, waiting for transmission */ |
1728 | DBG3("Relayd live viewer worker thread polling..."); | |
eea7556c | 1729 | health_poll_entry(); |
d3e2ba59 | 1730 | ret = lttng_poll_wait(&events, -1); |
eea7556c | 1731 | health_poll_exit(); |
d3e2ba59 JD |
1732 | if (ret < 0) { |
1733 | /* | |
1734 | * Restart interrupted system call. | |
1735 | */ | |
1736 | if (errno == EINTR) { | |
1737 | goto restart; | |
1738 | } | |
1739 | goto error; | |
1740 | } | |
1741 | ||
1742 | nb_fd = ret; | |
1743 | ||
1744 | /* | |
1745 | * Process control. The control connection is prioritised so we don't | |
1746 | * starve it with high throughput tracing data on the data | |
1747 | * connection. | |
1748 | */ | |
1749 | for (i = 0; i < nb_fd; i++) { | |
1750 | /* Fetch once the poll data */ | |
1751 | uint32_t revents = LTTNG_POLL_GETEV(&events, i); | |
1752 | int pollfd = LTTNG_POLL_GETFD(&events, i); | |
1753 | ||
eea7556c MD |
1754 | health_code_update(); |
1755 | ||
d3e2ba59 JD |
1756 | /* Thread quit pipe has been closed. Killing thread. */ |
1757 | ret = check_thread_quit_pipe(pollfd, revents); | |
1758 | if (ret) { | |
1759 | err = 0; | |
1760 | goto exit; | |
1761 | } | |
1762 | ||
1763 | /* Inspect the relay cmd pipe for new connection */ | |
1764 | if (pollfd == live_relay_cmd_pipe[0]) { | |
1765 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1766 | ERR("Relay live pipe error"); | |
1767 | goto error; | |
1768 | } else if (revents & LPOLLIN) { | |
1769 | DBG("Relay live viewer command received"); | |
1770 | ret = add_connection(live_relay_cmd_pipe[0], | |
1771 | &events, relay_connections_ht); | |
1772 | if (ret < 0) { | |
1773 | goto error; | |
1774 | } | |
1775 | } | |
1776 | } else if (revents) { | |
1777 | rcu_read_lock(); | |
1778 | lttng_ht_lookup(relay_connections_ht, | |
1779 | (void *)((unsigned long) pollfd), &iter); | |
1780 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1781 | if (node == NULL) { | |
1782 | DBG2("Relay viewer sock %d not found", pollfd); | |
1783 | rcu_read_unlock(); | |
1784 | goto error; | |
1785 | } | |
1786 | relay_connection = caa_container_of(node, struct relay_command, | |
1787 | sock_n); | |
1788 | ||
1789 | if (revents & (LPOLLERR)) { | |
d3e2ba59 JD |
1790 | cleanup_poll_connection(&events, pollfd); |
1791 | del_connection(relay_connections_ht, &iter, | |
92c6ca54 | 1792 | relay_connection); |
d3e2ba59 JD |
1793 | } else if (revents & (LPOLLHUP | LPOLLRDHUP)) { |
1794 | DBG("Viewer socket %d hung up", pollfd); | |
1795 | cleanup_poll_connection(&events, pollfd); | |
1796 | del_connection(relay_connections_ht, &iter, | |
92c6ca54 | 1797 | relay_connection); |
d3e2ba59 JD |
1798 | } else if (revents & LPOLLIN) { |
1799 | ret = relay_connection->sock->ops->recvmsg( | |
1800 | relay_connection->sock, &recv_hdr, | |
1801 | sizeof(struct lttng_viewer_cmd), | |
1802 | 0); | |
1803 | /* connection closed */ | |
1804 | if (ret <= 0) { | |
1805 | cleanup_poll_connection(&events, pollfd); | |
aaec7998 | 1806 | del_connection(relay_connections_ht, &iter, |
92c6ca54 | 1807 | relay_connection); |
d3e2ba59 JD |
1808 | DBG("Viewer control connection closed with %d", |
1809 | pollfd); | |
1810 | } else { | |
1811 | if (relay_connection->session) { | |
1812 | DBG2("Relay viewer worker receiving data for " | |
1813 | "session: %" PRIu64, | |
1814 | relay_connection->session->id); | |
1815 | } | |
1816 | ret = process_control(&recv_hdr, relay_connection, | |
92c6ca54 | 1817 | sessions_ht); |
d3e2ba59 JD |
1818 | if (ret < 0) { |
1819 | /* Clear the session on error. */ | |
1820 | cleanup_poll_connection(&events, pollfd); | |
1821 | del_connection(relay_connections_ht, &iter, | |
92c6ca54 | 1822 | relay_connection); |
d3e2ba59 JD |
1823 | DBG("Viewer connection closed with %d", pollfd); |
1824 | } | |
1825 | } | |
1826 | } | |
1827 | rcu_read_unlock(); | |
1828 | } | |
1829 | } | |
1830 | } | |
1831 | ||
1832 | exit: | |
1833 | error: | |
1834 | lttng_poll_clean(&events); | |
1835 | ||
1836 | /* empty the hash table and free the memory */ | |
1837 | rcu_read_lock(); | |
1838 | cds_lfht_for_each_entry(relay_connections_ht->ht, &iter.iter, node, node) { | |
eea7556c MD |
1839 | health_code_update(); |
1840 | ||
d3e2ba59 JD |
1841 | node = lttng_ht_iter_get_node_ulong(&iter); |
1842 | if (!node) { | |
1843 | continue; | |
1844 | } | |
1845 | ||
1846 | relay_connection = caa_container_of(node, struct relay_command, | |
1847 | sock_n); | |
92c6ca54 | 1848 | del_connection(relay_connections_ht, &iter, relay_connection); |
d3e2ba59 JD |
1849 | } |
1850 | rcu_read_unlock(); | |
1851 | error_poll_create: | |
1852 | lttng_ht_destroy(relay_connections_ht); | |
1853 | relay_connections_ht_error: | |
1854 | /* Close relay cmd pipes */ | |
1855 | utils_close_pipe(live_relay_cmd_pipe); | |
1856 | if (err) { | |
1857 | DBG("Viewer worker thread exited with error"); | |
1858 | } | |
1859 | DBG("Viewer worker thread cleanup complete"); | |
4e5b8b82 | 1860 | error_testpoint: |
eea7556c MD |
1861 | if (err) { |
1862 | health_error(); | |
1863 | ERR("Health error occurred in %s", __func__); | |
1864 | } | |
1865 | health_unregister(health_relayd); | |
d3e2ba59 JD |
1866 | stop_threads(); |
1867 | rcu_unregister_thread(); | |
1868 | return NULL; | |
1869 | } | |
1870 | ||
1871 | /* | |
1872 | * Create the relay command pipe to wake thread_manage_apps. | |
1873 | * Closed in cleanup(). | |
1874 | */ | |
1875 | static int create_relay_cmd_pipe(void) | |
1876 | { | |
1877 | int ret; | |
1878 | ||
1879 | ret = utils_create_pipe_cloexec(live_relay_cmd_pipe); | |
1880 | ||
1881 | return ret; | |
1882 | } | |
1883 | ||
aaec7998 | 1884 | void live_stop_threads(void) |
d3e2ba59 JD |
1885 | { |
1886 | int ret; | |
1887 | void *status; | |
1888 | ||
1889 | stop_threads(); | |
1890 | ||
1891 | ret = pthread_join(live_listener_thread, &status); | |
1892 | if (ret != 0) { | |
1893 | PERROR("pthread_join live listener"); | |
1894 | goto error; /* join error, exit without cleanup */ | |
1895 | } | |
1896 | ||
1897 | ret = pthread_join(live_worker_thread, &status); | |
1898 | if (ret != 0) { | |
1899 | PERROR("pthread_join live worker"); | |
1900 | goto error; /* join error, exit without cleanup */ | |
1901 | } | |
1902 | ||
1903 | ret = pthread_join(live_dispatcher_thread, &status); | |
1904 | if (ret != 0) { | |
1905 | PERROR("pthread_join live dispatcher"); | |
1906 | goto error; /* join error, exit without cleanup */ | |
1907 | } | |
1908 | ||
1909 | cleanup(); | |
1910 | ||
1911 | error: | |
1912 | return; | |
1913 | } | |
1914 | ||
1915 | /* | |
1916 | * main | |
1917 | */ | |
1918 | int live_start_threads(struct lttng_uri *uri, | |
3557d456 | 1919 | struct relay_local_data *relay_ctx) |
d3e2ba59 JD |
1920 | { |
1921 | int ret = 0; | |
1922 | void *status; | |
1923 | int is_root; | |
1924 | ||
1925 | assert(uri); | |
1926 | live_uri = uri; | |
1927 | ||
d3e2ba59 JD |
1928 | /* Check if daemon is UID = 0 */ |
1929 | is_root = !getuid(); | |
1930 | ||
1931 | if (!is_root) { | |
1932 | if (live_uri->port < 1024) { | |
1933 | ERR("Need to be root to use ports < 1024"); | |
1934 | ret = -1; | |
1935 | goto exit; | |
1936 | } | |
1937 | } | |
1938 | ||
1939 | /* Setup the thread apps communication pipe. */ | |
1940 | if ((ret = create_relay_cmd_pipe()) < 0) { | |
1941 | goto exit; | |
1942 | } | |
1943 | ||
1944 | /* Init relay command queue. */ | |
1945 | cds_wfq_init(&viewer_cmd_queue.queue); | |
1946 | ||
1947 | /* Set up max poll set size */ | |
1948 | lttng_poll_set_max_size(); | |
1949 | ||
1950 | /* Setup the dispatcher thread */ | |
1951 | ret = pthread_create(&live_dispatcher_thread, NULL, | |
1952 | thread_dispatcher, (void *) NULL); | |
1953 | if (ret != 0) { | |
1954 | PERROR("pthread_create viewer dispatcher"); | |
1955 | goto exit_dispatcher; | |
1956 | } | |
1957 | ||
1958 | /* Setup the worker thread */ | |
1959 | ret = pthread_create(&live_worker_thread, NULL, | |
1960 | thread_worker, relay_ctx); | |
1961 | if (ret != 0) { | |
1962 | PERROR("pthread_create viewer worker"); | |
1963 | goto exit_worker; | |
1964 | } | |
1965 | ||
1966 | /* Setup the listener thread */ | |
1967 | ret = pthread_create(&live_listener_thread, NULL, | |
1968 | thread_listener, (void *) NULL); | |
1969 | if (ret != 0) { | |
1970 | PERROR("pthread_create viewer listener"); | |
1971 | goto exit_listener; | |
1972 | } | |
1973 | ||
1974 | ret = 0; | |
1975 | goto end; | |
1976 | ||
1977 | exit_listener: | |
1978 | ret = pthread_join(live_listener_thread, &status); | |
1979 | if (ret != 0) { | |
1980 | PERROR("pthread_join live listener"); | |
1981 | goto error; /* join error, exit without cleanup */ | |
1982 | } | |
1983 | ||
1984 | exit_worker: | |
1985 | ret = pthread_join(live_worker_thread, &status); | |
1986 | if (ret != 0) { | |
1987 | PERROR("pthread_join live worker"); | |
1988 | goto error; /* join error, exit without cleanup */ | |
1989 | } | |
1990 | ||
1991 | exit_dispatcher: | |
1992 | ret = pthread_join(live_dispatcher_thread, &status); | |
1993 | if (ret != 0) { | |
1994 | PERROR("pthread_join live dispatcher"); | |
1995 | goto error; /* join error, exit without cleanup */ | |
1996 | } | |
1997 | ||
1998 | exit: | |
1999 | cleanup(); | |
2000 | ||
2001 | end: | |
2002 | error: | |
2003 | return ret; | |
2004 | } |