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> | |
2f8f53af | 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" |
9b5e0863 | 60 | #include "testpoint.h" |
2f8f53af | 61 | #include "viewer-stream.h" |
2a174661 DG |
62 | #include "stream.h" |
63 | #include "session.h" | |
64 | #include "ctf-trace.h" | |
58eb9381 | 65 | #include "connection.h" |
d3e2ba59 JD |
66 | |
67 | static struct lttng_uri *live_uri; | |
68 | ||
d3e2ba59 JD |
69 | /* |
70 | * This pipe is used to inform the worker thread that a command is queued and | |
71 | * ready to be processed. | |
72 | */ | |
58eb9381 | 73 | static int live_conn_pipe[2] = { -1, -1 }; |
d3e2ba59 JD |
74 | |
75 | /* Shared between threads */ | |
76 | static int live_dispatch_thread_exit; | |
77 | ||
78 | static pthread_t live_listener_thread; | |
79 | static pthread_t live_dispatcher_thread; | |
80 | static pthread_t live_worker_thread; | |
81 | ||
82 | /* | |
83 | * Relay command queue. | |
84 | * | |
85 | * The live_thread_listener and live_thread_dispatcher communicate with this | |
86 | * queue. | |
87 | */ | |
58eb9381 | 88 | static struct relay_conn_queue viewer_conn_queue; |
d3e2ba59 JD |
89 | |
90 | static uint64_t last_relay_viewer_session_id; | |
91 | ||
92 | /* | |
93 | * Cleanup the daemon | |
94 | */ | |
95 | static | |
96 | void cleanup(void) | |
97 | { | |
98 | DBG("Cleaning up"); | |
99 | ||
d3e2ba59 JD |
100 | free(live_uri); |
101 | } | |
102 | ||
2f8f53af DG |
103 | /* |
104 | * Receive a request buffer using a given socket, destination allocated buffer | |
105 | * of length size. | |
106 | * | |
107 | * Return the size of the received message or else a negative value on error | |
108 | * with errno being set by recvmsg() syscall. | |
109 | */ | |
110 | static | |
111 | ssize_t recv_request(struct lttcomm_sock *sock, void *buf, size_t size) | |
112 | { | |
113 | ssize_t ret; | |
114 | ||
115 | assert(sock); | |
116 | assert(buf); | |
117 | ||
118 | ret = sock->ops->recvmsg(sock, buf, size, 0); | |
119 | if (ret < 0 || ret != size) { | |
120 | if (ret == 0) { | |
121 | /* Orderly shutdown. Not necessary to print an error. */ | |
122 | DBG("Socket %d did an orderly shutdown", sock->fd); | |
123 | } else { | |
124 | ERR("Relay failed to receive request."); | |
125 | } | |
126 | ret = -1; | |
127 | } | |
128 | ||
129 | return ret; | |
130 | } | |
131 | ||
132 | /* | |
133 | * Send a response buffer using a given socket, source allocated buffer of | |
134 | * length size. | |
135 | * | |
136 | * Return the size of the sent message or else a negative value on error with | |
137 | * errno being set by sendmsg() syscall. | |
138 | */ | |
139 | static | |
140 | ssize_t send_response(struct lttcomm_sock *sock, void *buf, size_t size) | |
141 | { | |
142 | ssize_t ret; | |
143 | ||
144 | assert(sock); | |
145 | assert(buf); | |
146 | ||
147 | ret = sock->ops->sendmsg(sock, buf, size, 0); | |
148 | if (ret < 0) { | |
149 | ERR("Relayd failed to send response."); | |
150 | } | |
151 | ||
152 | return ret; | |
153 | } | |
154 | ||
155 | /* | |
156 | * Atomically check if new streams got added in the session since the last | |
157 | * check and reset the flag to 0. | |
158 | * | |
159 | * Returns 1 if new streams got added, 0 if nothing changed, a negative value | |
160 | * on error. | |
161 | */ | |
162 | static | |
163 | int check_new_streams(uint64_t session_id, struct lttng_ht *sessions_ht) | |
164 | { | |
165 | int ret; | |
166 | unsigned long current_val; | |
167 | struct relay_session *session; | |
168 | ||
169 | assert(sessions_ht); | |
170 | ||
171 | session = session_find_by_id(sessions_ht, session_id); | |
172 | if (!session) { | |
173 | DBG("Relay session %" PRIu64 " not found", session_id); | |
174 | ret = -1; | |
175 | goto error; | |
176 | } | |
177 | ||
178 | current_val = uatomic_cmpxchg(&session->new_streams, 1, 0); | |
179 | ret = current_val; | |
180 | ||
181 | error: | |
182 | return ret; | |
183 | } | |
184 | ||
185 | /* | |
186 | * Send viewer streams to the given socket. The ignore_sent_flag indicates if | |
187 | * this function should ignore the sent flag or not. | |
188 | * | |
189 | * Return 0 on success or else a negative value. | |
190 | */ | |
191 | static | |
192 | ssize_t send_viewer_streams(struct lttcomm_sock *sock, | |
193 | struct relay_session *session, unsigned int ignore_sent_flag) | |
194 | { | |
195 | ssize_t ret; | |
196 | struct lttng_viewer_stream send_stream; | |
197 | struct lttng_ht_iter iter; | |
198 | struct relay_viewer_stream *vstream; | |
199 | ||
200 | assert(session); | |
201 | ||
202 | rcu_read_lock(); | |
203 | ||
204 | cds_lfht_for_each_entry(viewer_streams_ht->ht, &iter.iter, vstream, | |
205 | stream_n.node) { | |
2a174661 DG |
206 | struct ctf_trace *ctf_trace; |
207 | ||
2f8f53af DG |
208 | health_code_update(); |
209 | ||
210 | /* Ignore if not the same session. */ | |
211 | if (vstream->session_id != session->id || | |
212 | (!ignore_sent_flag && vstream->sent_flag)) { | |
213 | continue; | |
214 | } | |
215 | ||
2a174661 DG |
216 | ctf_trace = ctf_trace_find_by_path(session->ctf_traces_ht, |
217 | vstream->path_name); | |
218 | assert(ctf_trace); | |
219 | ||
2f8f53af | 220 | send_stream.id = htobe64(vstream->stream_handle); |
2a174661 | 221 | send_stream.ctf_trace_id = htobe64(ctf_trace->id); |
2f8f53af DG |
222 | send_stream.metadata_flag = htobe32(vstream->metadata_flag); |
223 | strncpy(send_stream.path_name, vstream->path_name, | |
224 | sizeof(send_stream.path_name)); | |
225 | strncpy(send_stream.channel_name, vstream->channel_name, | |
226 | sizeof(send_stream.channel_name)); | |
227 | ||
228 | DBG("Sending stream %" PRIu64 " to viewer", vstream->stream_handle); | |
229 | ret = send_response(sock, &send_stream, sizeof(send_stream)); | |
230 | if (ret < 0) { | |
231 | goto end_unlock; | |
232 | } | |
233 | vstream->sent_flag = 1; | |
234 | } | |
235 | ||
236 | ret = 0; | |
237 | ||
238 | end_unlock: | |
239 | rcu_read_unlock(); | |
240 | return ret; | |
241 | } | |
242 | ||
243 | /* | |
244 | * Create every viewer stream possible for the given session with the seek | |
245 | * type. Three counters *can* be return which are in order the total amount of | |
246 | * viewer stream of the session, the number of unsent stream and the number of | |
247 | * stream created. Those counters can be NULL and thus will be ignored. | |
248 | * | |
249 | * Return 0 on success or else a negative value. | |
250 | */ | |
251 | static | |
252 | int make_viewer_streams(struct relay_session *session, | |
253 | enum lttng_viewer_seek seek_t, uint32_t *nb_total, uint32_t *nb_unsent, | |
254 | uint32_t *nb_created) | |
255 | { | |
256 | int ret; | |
2f8f53af | 257 | struct lttng_ht_iter iter; |
2a174661 | 258 | struct ctf_trace *ctf_trace; |
2f8f53af DG |
259 | |
260 | assert(session); | |
261 | ||
262 | /* | |
263 | * This is to make sure we create viewer streams for a full received | |
264 | * channel. For instance, if we have 8 streams for a channel that are | |
265 | * concurrently being flagged ready, we can end up creating just a subset | |
266 | * of the 8 streams (the ones that are flagged). This lock avoids this | |
267 | * limbo state. | |
268 | */ | |
269 | pthread_mutex_lock(&session->viewer_ready_lock); | |
270 | ||
271 | /* | |
272 | * Create viewer streams for relay streams that are ready to be used for a | |
273 | * the given session id only. | |
274 | */ | |
2a174661 DG |
275 | rcu_read_lock(); |
276 | cds_lfht_for_each_entry(session->ctf_traces_ht->ht, &iter.iter, ctf_trace, | |
277 | node.node) { | |
278 | struct relay_stream *stream; | |
2f8f53af DG |
279 | |
280 | health_code_update(); | |
281 | ||
2a174661 | 282 | if (ctf_trace->invalid_flag) { |
2f8f53af DG |
283 | continue; |
284 | } | |
285 | ||
2a174661 DG |
286 | cds_list_for_each_entry(stream, &ctf_trace->stream_list, trace_list) { |
287 | struct relay_viewer_stream *vstream; | |
288 | ||
289 | if (!stream->viewer_ready) { | |
290 | continue; | |
291 | } | |
292 | ||
293 | vstream = viewer_stream_find_by_id(stream->stream_handle); | |
2f8f53af | 294 | if (!vstream) { |
2a174661 DG |
295 | vstream = viewer_stream_create(stream, seek_t, ctf_trace); |
296 | if (!vstream) { | |
297 | ret = -1; | |
298 | goto error_unlock; | |
299 | } | |
300 | /* Acquire reference to ctf_trace. */ | |
301 | ctf_trace_get_ref(ctf_trace); | |
302 | ||
303 | if (nb_created) { | |
304 | /* Update number of created stream counter. */ | |
305 | (*nb_created)++; | |
306 | } | |
307 | } else if (!vstream->sent_flag && nb_unsent) { | |
308 | /* Update number of unsent stream counter. */ | |
309 | (*nb_unsent)++; | |
2f8f53af | 310 | } |
2a174661 DG |
311 | /* Update number of total stream counter. */ |
312 | if (nb_total) { | |
313 | (*nb_total)++; | |
2f8f53af | 314 | } |
2f8f53af DG |
315 | } |
316 | } | |
317 | ||
318 | ret = 0; | |
319 | ||
320 | error_unlock: | |
2a174661 | 321 | rcu_read_unlock(); |
2f8f53af DG |
322 | pthread_mutex_unlock(&session->viewer_ready_lock); |
323 | return ret; | |
324 | } | |
325 | ||
d3e2ba59 JD |
326 | /* |
327 | * Write to writable pipe used to notify a thread. | |
328 | */ | |
329 | static | |
330 | int notify_thread_pipe(int wpipe) | |
331 | { | |
6cd525e8 | 332 | ssize_t ret; |
d3e2ba59 | 333 | |
6cd525e8 MD |
334 | ret = lttng_write(wpipe, "!", 1); |
335 | if (ret < 1) { | |
d3e2ba59 JD |
336 | PERROR("write poll pipe"); |
337 | } | |
338 | ||
6cd525e8 | 339 | return (int) ret; |
d3e2ba59 JD |
340 | } |
341 | ||
342 | /* | |
343 | * Stop all threads by closing the thread quit pipe. | |
344 | */ | |
345 | static | |
346 | void stop_threads(void) | |
347 | { | |
348 | int ret; | |
349 | ||
350 | /* Stopping all threads */ | |
351 | DBG("Terminating all live threads"); | |
2a174661 | 352 | ret = notify_thread_pipe(live_conn_pipe[1]); |
d3e2ba59 JD |
353 | if (ret < 0) { |
354 | ERR("write error on thread quit pipe"); | |
355 | } | |
356 | ||
357 | /* Dispatch thread */ | |
358 | CMM_STORE_SHARED(live_dispatch_thread_exit, 1); | |
58eb9381 | 359 | futex_nto1_wake(&viewer_conn_queue.futex); |
d3e2ba59 JD |
360 | } |
361 | ||
d3e2ba59 JD |
362 | /* |
363 | * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set. | |
364 | */ | |
365 | static | |
366 | int create_thread_poll_set(struct lttng_poll_event *events, int size) | |
367 | { | |
368 | int ret; | |
369 | ||
370 | if (events == NULL || size == 0) { | |
371 | ret = -1; | |
372 | goto error; | |
373 | } | |
374 | ||
375 | ret = lttng_poll_create(events, size, LTTNG_CLOEXEC); | |
376 | if (ret < 0) { | |
377 | goto error; | |
378 | } | |
379 | ||
380 | /* Add quit pipe */ | |
2a174661 | 381 | ret = lttng_poll_add(events, live_conn_pipe[0], LPOLLIN | LPOLLERR); |
d3e2ba59 JD |
382 | if (ret < 0) { |
383 | goto error; | |
384 | } | |
385 | ||
386 | return 0; | |
387 | ||
388 | error: | |
389 | return ret; | |
390 | } | |
391 | ||
392 | /* | |
393 | * Check if the thread quit pipe was triggered. | |
394 | * | |
395 | * Return 1 if it was triggered else 0; | |
396 | */ | |
397 | static | |
2a174661 | 398 | int check_live_conn_pipe(int fd, uint32_t events) |
d3e2ba59 | 399 | { |
2a174661 | 400 | if (fd == live_conn_pipe[0] && (events & LPOLLIN)) { |
d3e2ba59 JD |
401 | return 1; |
402 | } | |
403 | ||
404 | return 0; | |
405 | } | |
406 | ||
407 | /* | |
408 | * Create and init socket from uri. | |
409 | */ | |
410 | static | |
411 | struct lttcomm_sock *init_socket(struct lttng_uri *uri) | |
412 | { | |
413 | int ret; | |
414 | struct lttcomm_sock *sock = NULL; | |
415 | ||
416 | sock = lttcomm_alloc_sock_from_uri(uri); | |
417 | if (sock == NULL) { | |
418 | ERR("Allocating socket"); | |
419 | goto error; | |
420 | } | |
421 | ||
422 | ret = lttcomm_create_sock(sock); | |
423 | if (ret < 0) { | |
424 | goto error; | |
425 | } | |
426 | DBG("Listening on sock %d for live", sock->fd); | |
427 | ||
428 | ret = sock->ops->bind(sock); | |
429 | if (ret < 0) { | |
430 | goto error; | |
431 | } | |
432 | ||
433 | ret = sock->ops->listen(sock, -1); | |
434 | if (ret < 0) { | |
435 | goto error; | |
436 | ||
437 | } | |
438 | ||
439 | return sock; | |
440 | ||
441 | error: | |
442 | if (sock) { | |
443 | lttcomm_destroy_sock(sock); | |
444 | } | |
445 | return NULL; | |
446 | } | |
447 | ||
448 | /* | |
449 | * This thread manages the listening for new connections on the network | |
450 | */ | |
451 | static | |
452 | void *thread_listener(void *data) | |
453 | { | |
454 | int i, ret, pollfd, err = -1; | |
d3e2ba59 JD |
455 | uint32_t revents, nb_fd; |
456 | struct lttng_poll_event events; | |
457 | struct lttcomm_sock *live_control_sock; | |
458 | ||
459 | DBG("[thread] Relay live listener started"); | |
460 | ||
eea7556c MD |
461 | health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_LISTENER); |
462 | ||
463 | health_code_update(); | |
464 | ||
d3e2ba59 JD |
465 | live_control_sock = init_socket(live_uri); |
466 | if (!live_control_sock) { | |
467 | goto error_sock_control; | |
468 | } | |
469 | ||
fb4d42ab | 470 | /* Pass 2 as size here for the thread quit pipe and control sockets. */ |
d3e2ba59 JD |
471 | ret = create_thread_poll_set(&events, 2); |
472 | if (ret < 0) { | |
473 | goto error_create_poll; | |
474 | } | |
475 | ||
476 | /* Add the control socket */ | |
477 | ret = lttng_poll_add(&events, live_control_sock->fd, LPOLLIN | LPOLLRDHUP); | |
478 | if (ret < 0) { | |
479 | goto error_poll_add; | |
480 | } | |
481 | ||
3fd27398 MD |
482 | lttng_relay_notify_ready(); |
483 | ||
9b5e0863 MD |
484 | if (testpoint(relayd_thread_live_listener)) { |
485 | goto error_testpoint; | |
486 | } | |
487 | ||
d3e2ba59 | 488 | while (1) { |
eea7556c MD |
489 | health_code_update(); |
490 | ||
d3e2ba59 JD |
491 | DBG("Listener accepting live viewers connections"); |
492 | ||
493 | restart: | |
eea7556c | 494 | health_poll_entry(); |
d3e2ba59 | 495 | ret = lttng_poll_wait(&events, -1); |
eea7556c | 496 | health_poll_exit(); |
d3e2ba59 JD |
497 | if (ret < 0) { |
498 | /* | |
499 | * Restart interrupted system call. | |
500 | */ | |
501 | if (errno == EINTR) { | |
502 | goto restart; | |
503 | } | |
504 | goto error; | |
505 | } | |
506 | nb_fd = ret; | |
507 | ||
508 | DBG("Relay new viewer connection received"); | |
509 | for (i = 0; i < nb_fd; i++) { | |
eea7556c MD |
510 | health_code_update(); |
511 | ||
d3e2ba59 JD |
512 | /* Fetch once the poll data */ |
513 | revents = LTTNG_POLL_GETEV(&events, i); | |
514 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
515 | ||
516 | /* Thread quit pipe has been closed. Killing thread. */ | |
2a174661 | 517 | ret = check_live_conn_pipe(pollfd, revents); |
d3e2ba59 JD |
518 | if (ret) { |
519 | err = 0; | |
520 | goto exit; | |
521 | } | |
522 | ||
523 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
524 | ERR("socket poll error"); | |
525 | goto error; | |
526 | } else if (revents & LPOLLIN) { | |
527 | /* | |
528 | * Get allocated in this thread, enqueued to a global queue, | |
529 | * dequeued and freed in the worker thread. | |
530 | */ | |
58eb9381 DG |
531 | int val = 1; |
532 | struct relay_connection *new_conn; | |
d3e2ba59 JD |
533 | struct lttcomm_sock *newsock; |
534 | ||
58eb9381 DG |
535 | new_conn = connection_create(); |
536 | if (!new_conn) { | |
d3e2ba59 JD |
537 | goto error; |
538 | } | |
539 | ||
d3e2ba59 JD |
540 | newsock = live_control_sock->ops->accept(live_control_sock); |
541 | if (!newsock) { | |
542 | PERROR("accepting control sock"); | |
58eb9381 | 543 | connection_free(new_conn); |
d3e2ba59 JD |
544 | goto error; |
545 | } | |
546 | DBG("Relay viewer connection accepted socket %d", newsock->fd); | |
58eb9381 | 547 | |
d3e2ba59 | 548 | ret = setsockopt(newsock->fd, SOL_SOCKET, SO_REUSEADDR, &val, |
58eb9381 | 549 | sizeof(val)); |
d3e2ba59 JD |
550 | if (ret < 0) { |
551 | PERROR("setsockopt inet"); | |
552 | lttcomm_destroy_sock(newsock); | |
58eb9381 | 553 | connection_free(new_conn); |
d3e2ba59 JD |
554 | goto error; |
555 | } | |
58eb9381 | 556 | new_conn->sock = newsock; |
d3e2ba59 | 557 | |
58eb9381 DG |
558 | /* Enqueue request for the dispatcher thread. */ |
559 | cds_wfq_enqueue(&viewer_conn_queue.queue, &new_conn->qnode); | |
d3e2ba59 JD |
560 | |
561 | /* | |
58eb9381 DG |
562 | * Wake the dispatch queue futex. Implicit memory barrier with |
563 | * the exchange in cds_wfq_enqueue. | |
d3e2ba59 | 564 | */ |
58eb9381 | 565 | futex_nto1_wake(&viewer_conn_queue.futex); |
d3e2ba59 JD |
566 | } |
567 | } | |
568 | } | |
569 | ||
570 | exit: | |
571 | error: | |
572 | error_poll_add: | |
9b5e0863 | 573 | error_testpoint: |
d3e2ba59 JD |
574 | lttng_poll_clean(&events); |
575 | error_create_poll: | |
576 | if (live_control_sock->fd >= 0) { | |
577 | ret = live_control_sock->ops->close(live_control_sock); | |
578 | if (ret) { | |
579 | PERROR("close"); | |
580 | } | |
581 | } | |
582 | lttcomm_destroy_sock(live_control_sock); | |
583 | error_sock_control: | |
584 | if (err) { | |
eea7556c | 585 | health_error(); |
d3e2ba59 JD |
586 | DBG("Live viewer listener thread exited with error"); |
587 | } | |
eea7556c | 588 | health_unregister(health_relayd); |
d3e2ba59 JD |
589 | DBG("Live viewer listener thread cleanup complete"); |
590 | stop_threads(); | |
591 | return NULL; | |
592 | } | |
593 | ||
594 | /* | |
595 | * This thread manages the dispatching of the requests to worker threads | |
596 | */ | |
597 | static | |
598 | void *thread_dispatcher(void *data) | |
599 | { | |
6cd525e8 MD |
600 | int err = -1; |
601 | ssize_t ret; | |
d3e2ba59 | 602 | struct cds_wfq_node *node; |
58eb9381 | 603 | struct relay_connection *conn = NULL; |
d3e2ba59 JD |
604 | |
605 | DBG("[thread] Live viewer relay dispatcher started"); | |
606 | ||
eea7556c MD |
607 | health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_DISPATCHER); |
608 | ||
9b5e0863 MD |
609 | if (testpoint(relayd_thread_live_dispatcher)) { |
610 | goto error_testpoint; | |
611 | } | |
612 | ||
eea7556c MD |
613 | health_code_update(); |
614 | ||
d3e2ba59 | 615 | while (!CMM_LOAD_SHARED(live_dispatch_thread_exit)) { |
eea7556c MD |
616 | health_code_update(); |
617 | ||
d3e2ba59 | 618 | /* Atomically prepare the queue futex */ |
58eb9381 | 619 | futex_nto1_prepare(&viewer_conn_queue.futex); |
d3e2ba59 JD |
620 | |
621 | do { | |
eea7556c MD |
622 | health_code_update(); |
623 | ||
d3e2ba59 | 624 | /* Dequeue commands */ |
58eb9381 | 625 | node = cds_wfq_dequeue_blocking(&viewer_conn_queue.queue); |
d3e2ba59 JD |
626 | if (node == NULL) { |
627 | DBG("Woken up but nothing in the live-viewer " | |
628 | "relay command queue"); | |
629 | /* Continue thread execution */ | |
630 | break; | |
631 | } | |
58eb9381 | 632 | conn = caa_container_of(node, struct relay_connection, qnode); |
d3e2ba59 | 633 | DBG("Dispatching viewer request waiting on sock %d", |
58eb9381 | 634 | conn->sock->fd); |
d3e2ba59 JD |
635 | |
636 | /* | |
637 | * Inform worker thread of the new request. This call is blocking | |
638 | * so we can be assured that the data will be read at some point in | |
639 | * time or wait to the end of the world :) | |
640 | */ | |
58eb9381 DG |
641 | ret = lttng_write(live_conn_pipe[1], &conn, sizeof(conn)); |
642 | if (ret < 0) { | |
643 | PERROR("write conn pipe"); | |
644 | connection_destroy(conn); | |
d3e2ba59 JD |
645 | goto error; |
646 | } | |
647 | } while (node != NULL); | |
648 | ||
649 | /* Futex wait on queue. Blocking call on futex() */ | |
eea7556c | 650 | health_poll_entry(); |
58eb9381 | 651 | futex_nto1_wait(&viewer_conn_queue.futex); |
eea7556c | 652 | health_poll_exit(); |
d3e2ba59 JD |
653 | } |
654 | ||
eea7556c MD |
655 | /* Normal exit, no error */ |
656 | err = 0; | |
657 | ||
d3e2ba59 | 658 | error: |
9b5e0863 | 659 | error_testpoint: |
eea7556c MD |
660 | if (err) { |
661 | health_error(); | |
662 | ERR("Health error occurred in %s", __func__); | |
663 | } | |
664 | health_unregister(health_relayd); | |
d3e2ba59 JD |
665 | DBG("Live viewer dispatch thread dying"); |
666 | stop_threads(); | |
667 | return NULL; | |
668 | } | |
669 | ||
670 | /* | |
671 | * Establish connection with the viewer and check the versions. | |
672 | * | |
673 | * Return 0 on success or else negative value. | |
674 | */ | |
675 | static | |
58eb9381 | 676 | int viewer_connect(struct relay_connection *conn) |
d3e2ba59 JD |
677 | { |
678 | int ret; | |
679 | struct lttng_viewer_connect reply, msg; | |
680 | ||
58eb9381 | 681 | assert(conn); |
d3e2ba59 | 682 | |
58eb9381 | 683 | conn->version_check_done = 1; |
d3e2ba59 | 684 | |
eea7556c MD |
685 | health_code_update(); |
686 | ||
2f8f53af DG |
687 | DBG("Viewer is establishing a connection to the relayd."); |
688 | ||
58eb9381 | 689 | ret = recv_request(conn->sock, &msg, sizeof(msg)); |
2f8f53af | 690 | if (ret < 0) { |
d3e2ba59 JD |
691 | goto end; |
692 | } | |
693 | ||
eea7556c MD |
694 | health_code_update(); |
695 | ||
d3e2ba59 JD |
696 | reply.major = RELAYD_VERSION_COMM_MAJOR; |
697 | reply.minor = RELAYD_VERSION_COMM_MINOR; | |
698 | ||
699 | /* Major versions must be the same */ | |
700 | if (reply.major != be32toh(msg.major)) { | |
2f8f53af DG |
701 | DBG("Incompatible major versions ([relayd] %u vs [client] %u)", |
702 | reply.major, be32toh(msg.major)); | |
72180669 | 703 | ret = -1; |
d3e2ba59 JD |
704 | goto end; |
705 | } | |
706 | ||
58eb9381 | 707 | conn->major = reply.major; |
d3e2ba59 JD |
708 | /* We adapt to the lowest compatible version */ |
709 | if (reply.minor <= be32toh(msg.minor)) { | |
58eb9381 | 710 | conn->minor = reply.minor; |
d3e2ba59 | 711 | } else { |
58eb9381 | 712 | conn->minor = be32toh(msg.minor); |
d3e2ba59 JD |
713 | } |
714 | ||
715 | if (be32toh(msg.type) == VIEWER_CLIENT_COMMAND) { | |
58eb9381 | 716 | conn->type = RELAY_VIEWER_COMMAND; |
d3e2ba59 | 717 | } else if (be32toh(msg.type) == VIEWER_CLIENT_NOTIFICATION) { |
58eb9381 | 718 | conn->type = RELAY_VIEWER_NOTIFICATION; |
d3e2ba59 JD |
719 | } else { |
720 | ERR("Unknown connection type : %u", be32toh(msg.type)); | |
721 | ret = -1; | |
722 | goto end; | |
723 | } | |
724 | ||
725 | reply.major = htobe32(reply.major); | |
726 | reply.minor = htobe32(reply.minor); | |
58eb9381 | 727 | if (conn->type == RELAY_VIEWER_COMMAND) { |
d3e2ba59 JD |
728 | reply.viewer_session_id = htobe64(++last_relay_viewer_session_id); |
729 | } | |
eea7556c MD |
730 | |
731 | health_code_update(); | |
732 | ||
58eb9381 | 733 | ret = send_response(conn->sock, &reply, sizeof(reply)); |
d3e2ba59 | 734 | if (ret < 0) { |
2f8f53af | 735 | goto end; |
d3e2ba59 JD |
736 | } |
737 | ||
eea7556c MD |
738 | health_code_update(); |
739 | ||
58eb9381 | 740 | DBG("Version check done using protocol %u.%u", conn->major, conn->minor); |
d3e2ba59 JD |
741 | ret = 0; |
742 | ||
743 | end: | |
744 | return ret; | |
745 | } | |
746 | ||
747 | /* | |
748 | * Send the viewer the list of current sessions. | |
749 | * | |
750 | * Return 0 on success or else a negative value. | |
751 | */ | |
752 | static | |
58eb9381 | 753 | int viewer_list_sessions(struct relay_connection *conn) |
d3e2ba59 JD |
754 | { |
755 | int ret; | |
756 | struct lttng_viewer_list_sessions session_list; | |
757 | unsigned long count; | |
758 | long approx_before, approx_after; | |
d3e2ba59 JD |
759 | struct lttng_ht_iter iter; |
760 | struct lttng_viewer_session send_session; | |
761 | struct relay_session *session; | |
762 | ||
763 | DBG("List sessions received"); | |
764 | ||
d3e2ba59 | 765 | rcu_read_lock(); |
58eb9381 DG |
766 | cds_lfht_count_nodes(conn->sessions_ht->ht, &approx_before, &count, |
767 | &approx_after); | |
d3e2ba59 JD |
768 | session_list.sessions_count = htobe32(count); |
769 | ||
eea7556c MD |
770 | health_code_update(); |
771 | ||
58eb9381 | 772 | ret = send_response(conn->sock, &session_list, sizeof(session_list)); |
d3e2ba59 | 773 | if (ret < 0) { |
d3e2ba59 JD |
774 | goto end_unlock; |
775 | } | |
776 | ||
eea7556c MD |
777 | health_code_update(); |
778 | ||
58eb9381 | 779 | cds_lfht_for_each_entry(conn->sessions_ht->ht, &iter.iter, session, |
2f8f53af | 780 | session_n.node) { |
eea7556c MD |
781 | health_code_update(); |
782 | ||
d3e2ba59 JD |
783 | strncpy(send_session.session_name, session->session_name, |
784 | sizeof(send_session.session_name)); | |
785 | strncpy(send_session.hostname, session->hostname, | |
786 | sizeof(send_session.hostname)); | |
787 | send_session.id = htobe64(session->id); | |
788 | send_session.live_timer = htobe32(session->live_timer); | |
2a174661 | 789 | send_session.clients = htobe32(session->viewer_refcount); |
87b576ec | 790 | send_session.streams = htobe32(session->stream_count); |
d3e2ba59 | 791 | |
eea7556c MD |
792 | health_code_update(); |
793 | ||
58eb9381 | 794 | ret = send_response(conn->sock, &send_session, sizeof(send_session)); |
d3e2ba59 | 795 | if (ret < 0) { |
d3e2ba59 JD |
796 | goto end_unlock; |
797 | } | |
798 | } | |
eea7556c MD |
799 | health_code_update(); |
800 | ||
d3e2ba59 JD |
801 | rcu_read_unlock(); |
802 | ret = 0; | |
803 | goto end; | |
804 | ||
805 | end_unlock: | |
806 | rcu_read_unlock(); | |
807 | ||
808 | end: | |
d3e2ba59 JD |
809 | return ret; |
810 | } | |
811 | ||
80e8027a JD |
812 | /* |
813 | * Send the viewer the list of current sessions. | |
814 | */ | |
815 | static | |
58eb9381 | 816 | int viewer_get_new_streams(struct relay_connection *conn) |
80e8027a JD |
817 | { |
818 | int ret, send_streams = 0; | |
2f8f53af | 819 | uint32_t nb_created = 0, nb_unsent = 0, nb_streams = 0; |
80e8027a JD |
820 | struct lttng_viewer_new_streams_request request; |
821 | struct lttng_viewer_new_streams_response response; | |
80e8027a JD |
822 | struct relay_session *session; |
823 | ||
58eb9381 | 824 | assert(conn); |
80e8027a JD |
825 | |
826 | DBG("Get new streams received"); | |
827 | ||
80e8027a JD |
828 | health_code_update(); |
829 | ||
2f8f53af | 830 | /* Receive the request from the connected client. */ |
58eb9381 | 831 | ret = recv_request(conn->sock, &request, sizeof(request)); |
2f8f53af | 832 | if (ret < 0) { |
80e8027a JD |
833 | goto error; |
834 | } | |
835 | ||
836 | health_code_update(); | |
837 | ||
838 | rcu_read_lock(); | |
58eb9381 DG |
839 | session = session_find_by_id(conn->sessions_ht, |
840 | be64toh(request.session_id)); | |
2f8f53af | 841 | if (!session) { |
80e8027a JD |
842 | DBG("Relay session %" PRIu64 " not found", |
843 | be64toh(request.session_id)); | |
844 | response.status = htobe32(VIEWER_NEW_STREAMS_ERR); | |
845 | goto send_reply; | |
846 | } | |
847 | ||
58eb9381 | 848 | if (conn->session_id == session->id) { |
80e8027a JD |
849 | /* We confirmed the viewer is asking for the same session. */ |
850 | send_streams = 1; | |
851 | response.status = htobe32(VIEWER_NEW_STREAMS_OK); | |
852 | } else { | |
853 | send_streams = 0; | |
854 | response.status = htobe32(VIEWER_NEW_STREAMS_ERR); | |
855 | goto send_reply; | |
856 | } | |
857 | ||
2f8f53af DG |
858 | if (!send_streams) { |
859 | goto send_reply; | |
80e8027a | 860 | } |
80e8027a | 861 | |
2f8f53af DG |
862 | ret = make_viewer_streams(session, VIEWER_SEEK_LAST, NULL, &nb_unsent, |
863 | &nb_created); | |
864 | if (ret < 0) { | |
865 | goto end_unlock; | |
866 | } | |
867 | /* Only send back the newly created streams with the unsent ones. */ | |
868 | nb_streams = nb_created + nb_unsent; | |
80e8027a JD |
869 | response.streams_count = htobe32(nb_streams); |
870 | ||
871 | send_reply: | |
872 | health_code_update(); | |
58eb9381 | 873 | ret = send_response(conn->sock, &response, sizeof(response)); |
80e8027a | 874 | if (ret < 0) { |
80e8027a JD |
875 | goto end_unlock; |
876 | } | |
877 | health_code_update(); | |
878 | ||
879 | /* | |
880 | * Unknown or empty session, just return gracefully, the viewer knows what | |
881 | * is happening. | |
882 | */ | |
883 | if (!send_streams || !nb_streams) { | |
884 | ret = 0; | |
885 | goto end_unlock; | |
886 | } | |
887 | ||
2f8f53af DG |
888 | /* |
889 | * Send stream and *DON'T* ignore the sent flag so every viewer streams | |
890 | * that were not sent from that point will be sent to the viewer. | |
891 | */ | |
58eb9381 | 892 | ret = send_viewer_streams(conn->sock, session, 0); |
2f8f53af DG |
893 | if (ret < 0) { |
894 | goto end_unlock; | |
80e8027a JD |
895 | } |
896 | ||
80e8027a JD |
897 | end_unlock: |
898 | rcu_read_unlock(); | |
80e8027a JD |
899 | error: |
900 | return ret; | |
901 | } | |
902 | ||
d3e2ba59 JD |
903 | /* |
904 | * Send the viewer the list of current sessions. | |
905 | */ | |
906 | static | |
58eb9381 | 907 | int viewer_attach_session(struct relay_connection *conn) |
d3e2ba59 | 908 | { |
2f8f53af DG |
909 | int send_streams = 0; |
910 | ssize_t ret; | |
80e8027a | 911 | uint32_t nb_streams = 0; |
2f8f53af | 912 | enum lttng_viewer_seek seek_type; |
d3e2ba59 JD |
913 | struct lttng_viewer_attach_session_request request; |
914 | struct lttng_viewer_attach_session_response response; | |
d3e2ba59 JD |
915 | struct relay_session *session; |
916 | ||
58eb9381 | 917 | assert(conn); |
d3e2ba59 | 918 | |
eea7556c MD |
919 | health_code_update(); |
920 | ||
2f8f53af | 921 | /* Receive the request from the connected client. */ |
58eb9381 | 922 | ret = recv_request(conn->sock, &request, sizeof(request)); |
2f8f53af | 923 | if (ret < 0) { |
d3e2ba59 JD |
924 | goto error; |
925 | } | |
926 | ||
eea7556c MD |
927 | health_code_update(); |
928 | ||
d3e2ba59 | 929 | rcu_read_lock(); |
58eb9381 DG |
930 | session = session_find_by_id(conn->sessions_ht, |
931 | be64toh(request.session_id)); | |
2f8f53af | 932 | if (!session) { |
d3e2ba59 JD |
933 | DBG("Relay session %" PRIu64 " not found", |
934 | be64toh(request.session_id)); | |
935 | response.status = htobe32(VIEWER_ATTACH_UNK); | |
936 | goto send_reply; | |
937 | } | |
2a174661 DG |
938 | session_viewer_attach(session); |
939 | DBG("Attach session ID %" PRIu64 " received", be64toh(request.session_id)); | |
d3e2ba59 | 940 | |
2a174661 | 941 | if (uatomic_read(&session->viewer_refcount) > 1) { |
d3e2ba59 JD |
942 | DBG("Already a viewer attached"); |
943 | response.status = htobe32(VIEWER_ATTACH_ALREADY); | |
2a174661 | 944 | session_viewer_detach(session); |
d3e2ba59 JD |
945 | goto send_reply; |
946 | } else if (session->live_timer == 0) { | |
947 | DBG("Not live session"); | |
948 | response.status = htobe32(VIEWER_ATTACH_NOT_LIVE); | |
949 | goto send_reply; | |
950 | } else { | |
d3e2ba59 JD |
951 | send_streams = 1; |
952 | response.status = htobe32(VIEWER_ATTACH_OK); | |
58eb9381 DG |
953 | conn->session_id = session->id; |
954 | conn->session = session; | |
d3e2ba59 JD |
955 | } |
956 | ||
957 | switch (be32toh(request.seek)) { | |
958 | case VIEWER_SEEK_BEGINNING: | |
d3e2ba59 | 959 | case VIEWER_SEEK_LAST: |
2f8f53af | 960 | seek_type = be32toh(request.seek); |
d3e2ba59 JD |
961 | break; |
962 | default: | |
963 | ERR("Wrong seek parameter"); | |
964 | response.status = htobe32(VIEWER_ATTACH_SEEK_ERR); | |
965 | send_streams = 0; | |
966 | goto send_reply; | |
967 | } | |
968 | ||
2f8f53af DG |
969 | if (!send_streams) { |
970 | goto send_reply; | |
971 | } | |
a4baae1b | 972 | |
2f8f53af DG |
973 | ret = make_viewer_streams(session, seek_type, &nb_streams, NULL, NULL); |
974 | if (ret < 0) { | |
975 | goto end_unlock; | |
d3e2ba59 | 976 | } |
2f8f53af | 977 | response.streams_count = htobe32(nb_streams); |
d3e2ba59 JD |
978 | |
979 | send_reply: | |
eea7556c | 980 | health_code_update(); |
58eb9381 | 981 | ret = send_response(conn->sock, &response, sizeof(response)); |
d3e2ba59 | 982 | if (ret < 0) { |
d3e2ba59 JD |
983 | goto end_unlock; |
984 | } | |
eea7556c | 985 | health_code_update(); |
d3e2ba59 JD |
986 | |
987 | /* | |
157df586 | 988 | * Unknown or empty session, just return gracefully, the viewer knows what |
d3e2ba59 JD |
989 | * is happening. |
990 | */ | |
157df586 | 991 | if (!send_streams || !nb_streams) { |
d3e2ba59 JD |
992 | ret = 0; |
993 | goto end_unlock; | |
994 | } | |
995 | ||
2f8f53af | 996 | /* Send stream and ignore the sent flag. */ |
58eb9381 | 997 | ret = send_viewer_streams(conn->sock, session, 1); |
2f8f53af DG |
998 | if (ret < 0) { |
999 | goto end_unlock; | |
d3e2ba59 | 1000 | } |
d3e2ba59 JD |
1001 | |
1002 | end_unlock: | |
1003 | rcu_read_unlock(); | |
4a9daf17 JD |
1004 | error: |
1005 | return ret; | |
1006 | } | |
1007 | ||
d3e2ba59 JD |
1008 | /* |
1009 | * Send the next index for a stream. | |
1010 | * | |
1011 | * Return 0 on success or else a negative value. | |
1012 | */ | |
1013 | static | |
58eb9381 | 1014 | int viewer_get_next_index(struct relay_connection *conn) |
d3e2ba59 JD |
1015 | { |
1016 | int ret; | |
1017 | struct lttng_viewer_get_next_index request_index; | |
1018 | struct lttng_viewer_index viewer_index; | |
50adc264 | 1019 | struct ctf_packet_index packet_index; |
d3e2ba59 JD |
1020 | struct relay_viewer_stream *vstream; |
1021 | struct relay_stream *rstream; | |
2a174661 DG |
1022 | struct ctf_trace *ctf_trace; |
1023 | struct relay_session *session; | |
d3e2ba59 | 1024 | |
58eb9381 | 1025 | assert(conn); |
d3e2ba59 JD |
1026 | |
1027 | DBG("Viewer get next index"); | |
1028 | ||
eea7556c | 1029 | health_code_update(); |
2f8f53af | 1030 | |
58eb9381 | 1031 | ret = recv_request(conn->sock, &request_index, sizeof(request_index)); |
2f8f53af | 1032 | if (ret < 0) { |
d3e2ba59 JD |
1033 | goto end; |
1034 | } | |
eea7556c | 1035 | health_code_update(); |
d3e2ba59 JD |
1036 | |
1037 | rcu_read_lock(); | |
58eb9381 | 1038 | session = session_find_by_id(conn->sessions_ht, conn->session_id); |
2a174661 DG |
1039 | if (!session) { |
1040 | ret = -1; | |
1041 | goto end_unlock; | |
1042 | } | |
1043 | ||
2f8f53af | 1044 | vstream = viewer_stream_find_by_id(be64toh(request_index.stream_id)); |
d3e2ba59 JD |
1045 | if (!vstream) { |
1046 | ret = -1; | |
1047 | goto end_unlock; | |
1048 | } | |
1049 | ||
2a174661 DG |
1050 | ctf_trace = ctf_trace_find_by_path(session->ctf_traces_ht, vstream->path_name); |
1051 | assert(ctf_trace); | |
1052 | ||
d3e2ba59 JD |
1053 | memset(&viewer_index, 0, sizeof(viewer_index)); |
1054 | ||
1055 | /* | |
1056 | * The viewer should not ask for index on metadata stream. | |
1057 | */ | |
1058 | if (vstream->metadata_flag) { | |
1059 | viewer_index.status = htobe32(VIEWER_INDEX_HUP); | |
1060 | goto send_reply; | |
1061 | } | |
1062 | ||
1063 | /* First time, we open the index file */ | |
1064 | if (vstream->index_read_fd < 0) { | |
2f8f53af DG |
1065 | ret = index_open(vstream->path_name, vstream->channel_name, |
1066 | vstream->tracefile_count, vstream->tracefile_count_current); | |
0e6830aa | 1067 | if (ret == -ENOENT) { |
d3e2ba59 JD |
1068 | /* |
1069 | * The index is created only when the first data packet arrives, it | |
1070 | * might not be ready at the beginning of the session | |
1071 | */ | |
1072 | viewer_index.status = htobe32(VIEWER_INDEX_RETRY); | |
1073 | goto send_reply; | |
1074 | } else if (ret < 0) { | |
1075 | viewer_index.status = htobe32(VIEWER_INDEX_ERR); | |
1076 | goto send_reply; | |
1077 | } | |
2f8f53af | 1078 | vstream->index_read_fd = ret; |
d3e2ba59 JD |
1079 | } |
1080 | ||
2a174661 DG |
1081 | rstream = stream_find_by_id(relay_streams_ht, vstream->stream_handle); |
1082 | assert(rstream); | |
1083 | ||
1084 | if (!rstream->close_flag) { | |
6b6b9a5a JD |
1085 | if (vstream->abort_flag) { |
1086 | /* Rotate on abort (overwrite). */ | |
1087 | DBG("Viewer rotate because of overwrite"); | |
2f8f53af | 1088 | ret = viewer_stream_rotate(vstream, rstream); |
6b6b9a5a JD |
1089 | if (ret < 0) { |
1090 | goto end_unlock; | |
a020f610 JD |
1091 | } else if (ret == 1) { |
1092 | viewer_index.status = htobe32(VIEWER_INDEX_HUP); | |
2f8f53af | 1093 | viewer_stream_delete(vstream); |
2a174661 | 1094 | viewer_stream_destroy(ctf_trace, vstream); |
a020f610 | 1095 | goto send_reply; |
6b6b9a5a | 1096 | } |
2a174661 | 1097 | /* ret == 0 means successful so we continue. */ |
6b6b9a5a | 1098 | } |
2a174661 | 1099 | |
6b6b9a5a | 1100 | pthread_mutex_lock(&rstream->viewer_stream_rotation_lock); |
cef0f7d5 JD |
1101 | if (rstream->tracefile_count_current == vstream->tracefile_count_current) { |
1102 | if (rstream->beacon_ts_end != -1ULL && | |
1103 | vstream->last_sent_index == rstream->total_index_received) { | |
1104 | viewer_index.status = htobe32(VIEWER_INDEX_INACTIVE); | |
1105 | viewer_index.timestamp_end = htobe64(rstream->beacon_ts_end); | |
1106 | pthread_mutex_unlock(&rstream->viewer_stream_rotation_lock); | |
1107 | goto send_reply; | |
cef0f7d5 JD |
1108 | } else if (rstream->total_index_received <= vstream->last_sent_index |
1109 | && !vstream->close_write_flag) { | |
2a174661 DG |
1110 | /* |
1111 | * Reader and writer are working in the same tracefile, so we care | |
1112 | * about the number of index received and sent. Otherwise, we read | |
1113 | * up to EOF. | |
1114 | */ | |
cef0f7d5 JD |
1115 | pthread_mutex_unlock(&rstream->viewer_stream_rotation_lock); |
1116 | /* No new index to send, retry later. */ | |
1117 | viewer_index.status = htobe32(VIEWER_INDEX_RETRY); | |
1118 | goto send_reply; | |
1119 | } | |
d3e2ba59 | 1120 | } |
6b6b9a5a | 1121 | pthread_mutex_unlock(&rstream->viewer_stream_rotation_lock); |
2a174661 | 1122 | } else if (rstream->close_flag && vstream->close_write_flag && |
d3e2ba59 | 1123 | vstream->total_index_received == vstream->last_sent_index) { |
6b6b9a5a | 1124 | /* Last index sent and current tracefile closed in write */ |
d3e2ba59 | 1125 | viewer_index.status = htobe32(VIEWER_INDEX_HUP); |
2f8f53af | 1126 | viewer_stream_delete(vstream); |
2a174661 | 1127 | viewer_stream_destroy(ctf_trace, vstream); |
d3e2ba59 | 1128 | goto send_reply; |
6b6b9a5a JD |
1129 | } else { |
1130 | vstream->close_write_flag = 1; | |
d3e2ba59 JD |
1131 | } |
1132 | ||
2a174661 DG |
1133 | if (!ctf_trace->metadata_received || |
1134 | ctf_trace->metadata_received > ctf_trace->metadata_sent) { | |
d3e2ba59 JD |
1135 | viewer_index.flags |= LTTNG_VIEWER_FLAG_NEW_METADATA; |
1136 | } | |
1137 | ||
58eb9381 | 1138 | ret = check_new_streams(vstream->session_id, conn->sessions_ht); |
4a9daf17 JD |
1139 | if (ret < 0) { |
1140 | goto end_unlock; | |
1141 | } else if (ret == 1) { | |
1142 | viewer_index.flags |= LTTNG_VIEWER_FLAG_NEW_STREAM; | |
1143 | } | |
1144 | ||
cef0f7d5 JD |
1145 | pthread_mutex_lock(&vstream->overwrite_lock); |
1146 | if (vstream->abort_flag) { | |
1147 | /* | |
2a174661 | 1148 | * The file is being overwritten by the writer, we cannot * use it. |
cef0f7d5 JD |
1149 | */ |
1150 | viewer_index.status = htobe32(VIEWER_INDEX_RETRY); | |
1151 | pthread_mutex_unlock(&vstream->overwrite_lock); | |
2f8f53af | 1152 | ret = viewer_stream_rotate(vstream, rstream); |
cef0f7d5 JD |
1153 | if (ret < 0) { |
1154 | goto end_unlock; | |
a020f610 JD |
1155 | } else if (ret == 1) { |
1156 | viewer_index.status = htobe32(VIEWER_INDEX_HUP); | |
2f8f53af | 1157 | viewer_stream_delete(vstream); |
2a174661 | 1158 | viewer_stream_destroy(ctf_trace, vstream); |
a020f610 | 1159 | goto send_reply; |
cef0f7d5 JD |
1160 | } |
1161 | goto send_reply; | |
1162 | } | |
2f8f53af | 1163 | |
6cd525e8 MD |
1164 | ret = lttng_read(vstream->index_read_fd, &packet_index, |
1165 | sizeof(packet_index)); | |
cef0f7d5 | 1166 | pthread_mutex_unlock(&vstream->overwrite_lock); |
d3e2ba59 | 1167 | if (ret < sizeof(packet_index)) { |
6b6b9a5a JD |
1168 | /* |
1169 | * The tracefile is closed in write, so we read up to EOF. | |
1170 | */ | |
1171 | if (vstream->close_write_flag == 1) { | |
1172 | viewer_index.status = htobe32(VIEWER_INDEX_RETRY); | |
1173 | /* Rotate on normal EOF */ | |
2f8f53af | 1174 | ret = viewer_stream_rotate(vstream, rstream); |
6b6b9a5a JD |
1175 | if (ret < 0) { |
1176 | goto end_unlock; | |
a020f610 JD |
1177 | } else if (ret == 1) { |
1178 | viewer_index.status = htobe32(VIEWER_INDEX_HUP); | |
2f8f53af | 1179 | viewer_stream_delete(vstream); |
2a174661 | 1180 | viewer_stream_destroy(ctf_trace, vstream); |
a020f610 | 1181 | goto send_reply; |
6b6b9a5a JD |
1182 | } |
1183 | } else { | |
2f8f53af | 1184 | PERROR("Relay reading index file %d", vstream->index_read_fd); |
cef0f7d5 | 1185 | viewer_index.status = htobe32(VIEWER_INDEX_ERR); |
6b6b9a5a JD |
1186 | } |
1187 | goto send_reply; | |
d3e2ba59 JD |
1188 | } else { |
1189 | viewer_index.status = htobe32(VIEWER_INDEX_OK); | |
1190 | vstream->last_sent_index++; | |
1191 | } | |
1192 | ||
1193 | /* | |
1194 | * Indexes are stored in big endian, no need to switch before sending. | |
1195 | */ | |
1196 | viewer_index.offset = packet_index.offset; | |
1197 | viewer_index.packet_size = packet_index.packet_size; | |
1198 | viewer_index.content_size = packet_index.content_size; | |
1199 | viewer_index.timestamp_begin = packet_index.timestamp_begin; | |
1200 | viewer_index.timestamp_end = packet_index.timestamp_end; | |
1201 | viewer_index.events_discarded = packet_index.events_discarded; | |
1202 | viewer_index.stream_id = packet_index.stream_id; | |
1203 | ||
1204 | send_reply: | |
1205 | viewer_index.flags = htobe32(viewer_index.flags); | |
eea7556c | 1206 | health_code_update(); |
2f8f53af | 1207 | |
58eb9381 | 1208 | ret = send_response(conn->sock, &viewer_index, sizeof(viewer_index)); |
d3e2ba59 | 1209 | if (ret < 0) { |
d3e2ba59 JD |
1210 | goto end_unlock; |
1211 | } | |
eea7556c | 1212 | health_code_update(); |
d3e2ba59 | 1213 | |
2f8f53af | 1214 | DBG("Index %" PRIu64 " for stream %" PRIu64 " sent", |
d3e2ba59 JD |
1215 | vstream->last_sent_index, vstream->stream_handle); |
1216 | ||
1217 | end_unlock: | |
1218 | rcu_read_unlock(); | |
1219 | ||
d3e2ba59 JD |
1220 | end: |
1221 | return ret; | |
1222 | } | |
1223 | ||
1224 | /* | |
1225 | * Send the next index for a stream | |
1226 | * | |
1227 | * Return 0 on success or else a negative value. | |
1228 | */ | |
1229 | static | |
58eb9381 | 1230 | int viewer_get_packet(struct relay_connection *conn) |
d3e2ba59 JD |
1231 | { |
1232 | int ret, send_data = 0; | |
1233 | char *data = NULL; | |
1234 | uint32_t len = 0; | |
1235 | ssize_t read_len; | |
1236 | struct lttng_viewer_get_packet get_packet_info; | |
1237 | struct lttng_viewer_trace_packet reply; | |
1238 | struct relay_viewer_stream *stream; | |
2a174661 | 1239 | struct ctf_trace *ctf_trace; |
d3e2ba59 | 1240 | |
58eb9381 | 1241 | assert(conn); |
d3e2ba59 JD |
1242 | |
1243 | DBG2("Relay get data packet"); | |
1244 | ||
eea7556c | 1245 | health_code_update(); |
2f8f53af | 1246 | |
58eb9381 | 1247 | ret = recv_request(conn->sock, &get_packet_info, sizeof(get_packet_info)); |
2f8f53af | 1248 | if (ret < 0) { |
d3e2ba59 JD |
1249 | goto end; |
1250 | } | |
eea7556c | 1251 | health_code_update(); |
d3e2ba59 | 1252 | |
0233a6a5 DG |
1253 | /* From this point on, the error label can be reached. */ |
1254 | memset(&reply, 0, sizeof(reply)); | |
1255 | ||
d3e2ba59 | 1256 | rcu_read_lock(); |
2f8f53af | 1257 | stream = viewer_stream_find_by_id(be64toh(get_packet_info.stream_id)); |
d3e2ba59 JD |
1258 | if (!stream) { |
1259 | goto error; | |
1260 | } | |
2a174661 | 1261 | |
58eb9381 | 1262 | ctf_trace = ctf_trace_find_by_path(conn->session->ctf_traces_ht, |
2a174661 DG |
1263 | stream->path_name); |
1264 | assert(ctf_trace); | |
d3e2ba59 JD |
1265 | |
1266 | /* | |
1267 | * First time we read this stream, we need open the tracefile, we should | |
1268 | * only arrive here if an index has already been sent to the viewer, so the | |
1269 | * tracefile must exist, if it does not it is a fatal error. | |
1270 | */ | |
1271 | if (stream->read_fd < 0) { | |
1272 | char fullpath[PATH_MAX]; | |
1273 | ||
6b6b9a5a JD |
1274 | if (stream->tracefile_count > 0) { |
1275 | ret = snprintf(fullpath, PATH_MAX, "%s/%s_%" PRIu64, stream->path_name, | |
1276 | stream->channel_name, | |
1277 | stream->tracefile_count_current); | |
1278 | } else { | |
1279 | ret = snprintf(fullpath, PATH_MAX, "%s/%s", stream->path_name, | |
1280 | stream->channel_name); | |
1281 | } | |
d3e2ba59 JD |
1282 | if (ret < 0) { |
1283 | goto error; | |
1284 | } | |
1285 | ret = open(fullpath, O_RDONLY); | |
1286 | if (ret < 0) { | |
1287 | PERROR("Relay opening trace file"); | |
1288 | goto error; | |
1289 | } | |
1290 | stream->read_fd = ret; | |
1291 | } | |
1292 | ||
2a174661 DG |
1293 | if (!ctf_trace->metadata_received || |
1294 | ctf_trace->metadata_received > ctf_trace->metadata_sent) { | |
d3e2ba59 JD |
1295 | reply.status = htobe32(VIEWER_GET_PACKET_ERR); |
1296 | reply.flags |= LTTNG_VIEWER_FLAG_NEW_METADATA; | |
d3e2ba59 JD |
1297 | goto send_reply; |
1298 | } | |
1299 | ||
58eb9381 | 1300 | ret = check_new_streams(stream->session_id, conn->sessions_ht); |
4a9daf17 JD |
1301 | if (ret < 0) { |
1302 | goto end_unlock; | |
1303 | } else if (ret == 1) { | |
1304 | reply.status = htobe32(VIEWER_GET_PACKET_ERR); | |
1305 | reply.flags |= LTTNG_VIEWER_FLAG_NEW_STREAM; | |
1306 | goto send_reply; | |
1307 | } | |
1308 | ||
d3e2ba59 JD |
1309 | len = be32toh(get_packet_info.len); |
1310 | data = zmalloc(len); | |
1311 | if (!data) { | |
1312 | PERROR("relay data zmalloc"); | |
1313 | goto error; | |
1314 | } | |
1315 | ||
1316 | ret = lseek(stream->read_fd, be64toh(get_packet_info.offset), SEEK_SET); | |
1317 | if (ret < 0) { | |
6b6b9a5a JD |
1318 | /* |
1319 | * If the read fd was closed by the streaming side, the | |
1320 | * abort_flag will be set to 1, otherwise it is an error. | |
1321 | */ | |
1322 | if (stream->abort_flag == 0) { | |
1323 | PERROR("lseek"); | |
1324 | goto error; | |
1325 | } | |
1326 | reply.status = htobe32(VIEWER_GET_PACKET_EOF); | |
1327 | goto send_reply; | |
d3e2ba59 | 1328 | } |
6cd525e8 MD |
1329 | read_len = lttng_read(stream->read_fd, data, len); |
1330 | if (read_len < len) { | |
6b6b9a5a JD |
1331 | /* |
1332 | * If the read fd was closed by the streaming side, the | |
1333 | * abort_flag will be set to 1, otherwise it is an error. | |
1334 | */ | |
1335 | if (stream->abort_flag == 0) { | |
1336 | PERROR("Relay reading trace file, fd: %d, offset: %" PRIu64, | |
1337 | stream->read_fd, | |
1338 | be64toh(get_packet_info.offset)); | |
1339 | goto error; | |
1340 | } else { | |
1341 | reply.status = htobe32(VIEWER_GET_PACKET_EOF); | |
1342 | goto send_reply; | |
1343 | } | |
d3e2ba59 JD |
1344 | } |
1345 | reply.status = htobe32(VIEWER_GET_PACKET_OK); | |
1346 | reply.len = htobe32(len); | |
1347 | send_data = 1; | |
1348 | goto send_reply; | |
1349 | ||
1350 | error: | |
1351 | reply.status = htobe32(VIEWER_GET_PACKET_ERR); | |
1352 | ||
1353 | send_reply: | |
1354 | reply.flags = htobe32(reply.flags); | |
eea7556c MD |
1355 | |
1356 | health_code_update(); | |
2f8f53af | 1357 | |
58eb9381 | 1358 | ret = send_response(conn->sock, &reply, sizeof(reply)); |
d3e2ba59 | 1359 | if (ret < 0) { |
d3e2ba59 JD |
1360 | goto end_unlock; |
1361 | } | |
eea7556c | 1362 | health_code_update(); |
d3e2ba59 JD |
1363 | |
1364 | if (send_data) { | |
eea7556c | 1365 | health_code_update(); |
58eb9381 | 1366 | ret = send_response(conn->sock, data, len); |
d3e2ba59 | 1367 | if (ret < 0) { |
d3e2ba59 JD |
1368 | goto end_unlock; |
1369 | } | |
eea7556c | 1370 | health_code_update(); |
d3e2ba59 JD |
1371 | } |
1372 | ||
1373 | DBG("Sent %u bytes for stream %" PRIu64, len, | |
1374 | be64toh(get_packet_info.stream_id)); | |
1375 | ||
1376 | end_unlock: | |
1377 | free(data); | |
1378 | rcu_read_unlock(); | |
1379 | ||
1380 | end: | |
1381 | return ret; | |
1382 | } | |
1383 | ||
1384 | /* | |
1385 | * Send the session's metadata | |
1386 | * | |
1387 | * Return 0 on success else a negative value. | |
1388 | */ | |
1389 | static | |
58eb9381 | 1390 | int viewer_get_metadata(struct relay_connection *conn) |
d3e2ba59 JD |
1391 | { |
1392 | int ret = 0; | |
1393 | ssize_t read_len; | |
1394 | uint64_t len = 0; | |
1395 | char *data = NULL; | |
1396 | struct lttng_viewer_get_metadata request; | |
1397 | struct lttng_viewer_metadata_packet reply; | |
1398 | struct relay_viewer_stream *stream; | |
2a174661 | 1399 | struct ctf_trace *ctf_trace; |
d3e2ba59 | 1400 | |
58eb9381 | 1401 | assert(conn); |
d3e2ba59 JD |
1402 | |
1403 | DBG("Relay get metadata"); | |
1404 | ||
eea7556c | 1405 | health_code_update(); |
2f8f53af | 1406 | |
58eb9381 | 1407 | ret = recv_request(conn->sock, &request, sizeof(request)); |
2f8f53af | 1408 | if (ret < 0) { |
d3e2ba59 JD |
1409 | goto end; |
1410 | } | |
eea7556c | 1411 | health_code_update(); |
d3e2ba59 JD |
1412 | |
1413 | rcu_read_lock(); | |
2f8f53af | 1414 | stream = viewer_stream_find_by_id(be64toh(request.stream_id)); |
d3e2ba59 JD |
1415 | if (!stream || !stream->metadata_flag) { |
1416 | ERR("Invalid metadata stream"); | |
1417 | goto error; | |
1418 | } | |
d3e2ba59 | 1419 | |
58eb9381 | 1420 | ctf_trace = ctf_trace_find_by_path(conn->session->ctf_traces_ht, |
2a174661 DG |
1421 | stream->path_name); |
1422 | assert(ctf_trace); | |
1423 | assert(ctf_trace->metadata_sent <= ctf_trace->metadata_received); | |
1424 | ||
1425 | len = ctf_trace->metadata_received - ctf_trace->metadata_sent; | |
d3e2ba59 JD |
1426 | if (len == 0) { |
1427 | reply.status = htobe32(VIEWER_NO_NEW_METADATA); | |
1428 | goto send_reply; | |
1429 | } | |
1430 | ||
1431 | /* first time, we open the metadata file */ | |
1432 | if (stream->read_fd < 0) { | |
1433 | char fullpath[PATH_MAX]; | |
1434 | ||
1435 | ret = snprintf(fullpath, PATH_MAX, "%s/%s", stream->path_name, | |
1436 | stream->channel_name); | |
1437 | if (ret < 0) { | |
1438 | goto error; | |
1439 | } | |
1440 | ret = open(fullpath, O_RDONLY); | |
1441 | if (ret < 0) { | |
1442 | PERROR("Relay opening metadata file"); | |
1443 | goto error; | |
1444 | } | |
1445 | stream->read_fd = ret; | |
1446 | } | |
1447 | ||
1448 | reply.len = htobe64(len); | |
1449 | data = zmalloc(len); | |
1450 | if (!data) { | |
1451 | PERROR("viewer metadata zmalloc"); | |
1452 | goto error; | |
1453 | } | |
1454 | ||
6cd525e8 MD |
1455 | read_len = lttng_read(stream->read_fd, data, len); |
1456 | if (read_len < len) { | |
d3e2ba59 JD |
1457 | PERROR("Relay reading metadata file"); |
1458 | goto error; | |
1459 | } | |
2a174661 | 1460 | ctf_trace->metadata_sent += read_len; |
d3e2ba59 JD |
1461 | reply.status = htobe32(VIEWER_METADATA_OK); |
1462 | goto send_reply; | |
1463 | ||
1464 | error: | |
1465 | reply.status = htobe32(VIEWER_METADATA_ERR); | |
1466 | ||
1467 | send_reply: | |
eea7556c | 1468 | health_code_update(); |
58eb9381 | 1469 | ret = send_response(conn->sock, &reply, sizeof(reply)); |
d3e2ba59 | 1470 | if (ret < 0) { |
d3e2ba59 JD |
1471 | goto end_unlock; |
1472 | } | |
eea7556c | 1473 | health_code_update(); |
d3e2ba59 JD |
1474 | |
1475 | if (len > 0) { | |
58eb9381 | 1476 | ret = send_response(conn->sock, data, len); |
d3e2ba59 | 1477 | if (ret < 0) { |
d3e2ba59 JD |
1478 | goto end_unlock; |
1479 | } | |
1480 | } | |
1481 | ||
1482 | DBG("Sent %" PRIu64 " bytes of metadata for stream %" PRIu64, len, | |
1483 | be64toh(request.stream_id)); | |
1484 | ||
1485 | DBG("Metadata sent"); | |
1486 | ||
1487 | end_unlock: | |
1488 | free(data); | |
1489 | rcu_read_unlock(); | |
1490 | end: | |
1491 | return ret; | |
1492 | } | |
1493 | ||
1494 | /* | |
1495 | * live_relay_unknown_command: send -1 if received unknown command | |
1496 | */ | |
1497 | static | |
58eb9381 | 1498 | void live_relay_unknown_command(struct relay_connection *conn) |
d3e2ba59 JD |
1499 | { |
1500 | struct lttcomm_relayd_generic_reply reply; | |
d3e2ba59 JD |
1501 | |
1502 | reply.ret_code = htobe32(LTTNG_ERR_UNK); | |
58eb9381 | 1503 | (void) send_response(conn->sock, &reply, sizeof(reply)); |
d3e2ba59 JD |
1504 | } |
1505 | ||
1506 | /* | |
1507 | * Process the commands received on the control socket | |
1508 | */ | |
1509 | static | |
1510 | int process_control(struct lttng_viewer_cmd *recv_hdr, | |
58eb9381 | 1511 | struct relay_connection *conn) |
d3e2ba59 JD |
1512 | { |
1513 | int ret = 0; | |
2f8f53af DG |
1514 | uint32_t msg_value; |
1515 | ||
1516 | assert(recv_hdr); | |
58eb9381 | 1517 | assert(conn); |
2f8f53af DG |
1518 | |
1519 | msg_value = be32toh(recv_hdr->cmd); | |
1520 | ||
1521 | /* | |
1522 | * Make sure we've done the version check before any command other then a | |
1523 | * new client connection. | |
1524 | */ | |
58eb9381 DG |
1525 | if (msg_value != VIEWER_CONNECT && !conn->version_check_done) { |
1526 | ERR("Viewer conn value %" PRIu32 " before version check", msg_value); | |
2f8f53af DG |
1527 | ret = -1; |
1528 | goto end; | |
1529 | } | |
d3e2ba59 | 1530 | |
2f8f53af | 1531 | switch (msg_value) { |
d3e2ba59 | 1532 | case VIEWER_CONNECT: |
58eb9381 | 1533 | ret = viewer_connect(conn); |
d3e2ba59 JD |
1534 | break; |
1535 | case VIEWER_LIST_SESSIONS: | |
58eb9381 | 1536 | ret = viewer_list_sessions(conn); |
d3e2ba59 JD |
1537 | break; |
1538 | case VIEWER_ATTACH_SESSION: | |
58eb9381 | 1539 | ret = viewer_attach_session(conn); |
d3e2ba59 JD |
1540 | break; |
1541 | case VIEWER_GET_NEXT_INDEX: | |
58eb9381 | 1542 | ret = viewer_get_next_index(conn); |
d3e2ba59 JD |
1543 | break; |
1544 | case VIEWER_GET_PACKET: | |
58eb9381 | 1545 | ret = viewer_get_packet(conn); |
d3e2ba59 JD |
1546 | break; |
1547 | case VIEWER_GET_METADATA: | |
58eb9381 | 1548 | ret = viewer_get_metadata(conn); |
d3e2ba59 | 1549 | break; |
80e8027a | 1550 | case VIEWER_GET_NEW_STREAMS: |
58eb9381 | 1551 | ret = viewer_get_new_streams(conn); |
80e8027a | 1552 | break; |
d3e2ba59 JD |
1553 | default: |
1554 | ERR("Received unknown viewer command (%u)", be32toh(recv_hdr->cmd)); | |
58eb9381 | 1555 | live_relay_unknown_command(conn); |
d3e2ba59 JD |
1556 | ret = -1; |
1557 | goto end; | |
1558 | } | |
1559 | ||
1560 | end: | |
1561 | return ret; | |
1562 | } | |
1563 | ||
1564 | static | |
58eb9381 | 1565 | void cleanup_connection_pollfd(struct lttng_poll_event *events, int pollfd) |
d3e2ba59 JD |
1566 | { |
1567 | int ret; | |
1568 | ||
1569 | assert(events); | |
1570 | ||
58eb9381 | 1571 | (void) lttng_poll_del(events, pollfd); |
d3e2ba59 JD |
1572 | |
1573 | ret = close(pollfd); | |
1574 | if (ret < 0) { | |
1575 | ERR("Closing pollfd %d", pollfd); | |
1576 | } | |
1577 | } | |
1578 | ||
157df586 JD |
1579 | /* |
1580 | * Delete all streams for a specific session ID. | |
1581 | */ | |
2a174661 | 1582 | static void destroy_viewer_streams_by_session(struct relay_session *session) |
d3e2ba59 | 1583 | { |
d3e2ba59 | 1584 | struct relay_viewer_stream *stream; |
d3e2ba59 JD |
1585 | struct lttng_ht_iter iter; |
1586 | ||
2a174661 DG |
1587 | assert(session); |
1588 | ||
d3e2ba59 | 1589 | rcu_read_lock(); |
157df586 JD |
1590 | cds_lfht_for_each_entry(viewer_streams_ht->ht, &iter.iter, stream, |
1591 | stream_n.node) { | |
2a174661 | 1592 | struct ctf_trace *ctf_trace; |
eea7556c | 1593 | |
2a174661 DG |
1594 | health_code_update(); |
1595 | if (stream->session_id != session->id) { | |
d3e2ba59 JD |
1596 | continue; |
1597 | } | |
1598 | ||
2a174661 DG |
1599 | ctf_trace = ctf_trace_find_by_path(session->ctf_traces_ht, |
1600 | stream->path_name); | |
1601 | assert(ctf_trace); | |
1602 | ||
2f8f53af | 1603 | viewer_stream_delete(stream); |
157df586 JD |
1604 | |
1605 | if (stream->metadata_flag) { | |
2a174661 DG |
1606 | ctf_trace->metadata_sent = 0; |
1607 | ctf_trace->viewer_metadata_stream = NULL; | |
d3e2ba59 | 1608 | } |
2a174661 DG |
1609 | |
1610 | viewer_stream_destroy(ctf_trace, stream); | |
d3e2ba59 JD |
1611 | } |
1612 | rcu_read_unlock(); | |
1613 | } | |
1614 | ||
2a174661 DG |
1615 | static void try_destroy_streams(struct relay_session *session) |
1616 | { | |
1617 | struct ctf_trace *ctf_trace; | |
1618 | struct lttng_ht_iter iter; | |
1619 | ||
1620 | assert(session); | |
1621 | ||
1622 | cds_lfht_for_each_entry(session->ctf_traces_ht->ht, &iter.iter, ctf_trace, | |
1623 | node.node) { | |
1624 | /* Attempt to destroy the ctf trace of that session. */ | |
1625 | ctf_trace_try_destroy(session, ctf_trace); | |
1626 | } | |
1627 | } | |
1628 | ||
d3e2ba59 | 1629 | /* |
58eb9381 | 1630 | * Delete and destroy a connection. |
d3e2ba59 JD |
1631 | * |
1632 | * RCU read side lock MUST be acquired. | |
1633 | */ | |
58eb9381 DG |
1634 | static void destroy_connection(struct lttng_ht *relay_connections_ht, |
1635 | struct relay_connection *conn) | |
d3e2ba59 | 1636 | { |
2a174661 | 1637 | struct relay_session *session; |
d3e2ba59 JD |
1638 | |
1639 | assert(relay_connections_ht); | |
58eb9381 | 1640 | assert(conn); |
d3e2ba59 | 1641 | |
58eb9381 | 1642 | DBG("Cleaning connection of session ID %" PRIu64, conn->session_id); |
157df586 | 1643 | |
58eb9381 | 1644 | connection_delete(relay_connections_ht, conn); |
d3e2ba59 | 1645 | |
58eb9381 DG |
1646 | rcu_read_lock(); |
1647 | session = session_find_by_id(conn->sessions_ht, conn->session_id); | |
2a174661 DG |
1648 | if (session) { |
1649 | /* | |
1650 | * Very important that this is done before destroying the session so we | |
1651 | * can put back every viewer stream reference from the ctf_trace. | |
1652 | */ | |
1653 | destroy_viewer_streams_by_session(session); | |
1654 | try_destroy_streams(session); | |
58eb9381 | 1655 | session_viewer_try_destroy(conn->sessions_ht, session); |
2a174661 DG |
1656 | } |
1657 | rcu_read_unlock(); | |
d3e2ba59 | 1658 | |
58eb9381 | 1659 | connection_destroy(conn); |
d3e2ba59 JD |
1660 | } |
1661 | ||
1662 | /* | |
1663 | * This thread does the actual work | |
1664 | */ | |
1665 | static | |
1666 | void *thread_worker(void *data) | |
1667 | { | |
1668 | int ret, err = -1; | |
1669 | uint32_t nb_fd; | |
58eb9381 | 1670 | struct relay_connection *conn; |
d3e2ba59 JD |
1671 | struct lttng_poll_event events; |
1672 | struct lttng_ht *relay_connections_ht; | |
d3e2ba59 JD |
1673 | struct lttng_ht_iter iter; |
1674 | struct lttng_viewer_cmd recv_hdr; | |
1675 | struct relay_local_data *relay_ctx = (struct relay_local_data *) data; | |
1676 | struct lttng_ht *sessions_ht = relay_ctx->sessions_ht; | |
d3e2ba59 JD |
1677 | |
1678 | DBG("[thread] Live viewer relay worker started"); | |
1679 | ||
1680 | rcu_register_thread(); | |
1681 | ||
eea7556c MD |
1682 | health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_WORKER); |
1683 | ||
9b5e0863 MD |
1684 | if (testpoint(relayd_thread_live_worker)) { |
1685 | goto error_testpoint; | |
1686 | } | |
1687 | ||
d3e2ba59 JD |
1688 | /* table of connections indexed on socket */ |
1689 | relay_connections_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); | |
1690 | if (!relay_connections_ht) { | |
1691 | goto relay_connections_ht_error; | |
1692 | } | |
1693 | ||
1694 | ret = create_thread_poll_set(&events, 2); | |
1695 | if (ret < 0) { | |
1696 | goto error_poll_create; | |
1697 | } | |
1698 | ||
58eb9381 | 1699 | ret = lttng_poll_add(&events, live_conn_pipe[0], LPOLLIN | LPOLLRDHUP); |
d3e2ba59 JD |
1700 | if (ret < 0) { |
1701 | goto error; | |
1702 | } | |
1703 | ||
1704 | restart: | |
1705 | while (1) { | |
1706 | int i; | |
1707 | ||
eea7556c MD |
1708 | health_code_update(); |
1709 | ||
d3e2ba59 JD |
1710 | /* Infinite blocking call, waiting for transmission */ |
1711 | DBG3("Relayd live viewer worker thread polling..."); | |
eea7556c | 1712 | health_poll_entry(); |
d3e2ba59 | 1713 | ret = lttng_poll_wait(&events, -1); |
eea7556c | 1714 | health_poll_exit(); |
d3e2ba59 JD |
1715 | if (ret < 0) { |
1716 | /* | |
1717 | * Restart interrupted system call. | |
1718 | */ | |
1719 | if (errno == EINTR) { | |
1720 | goto restart; | |
1721 | } | |
1722 | goto error; | |
1723 | } | |
1724 | ||
1725 | nb_fd = ret; | |
1726 | ||
1727 | /* | |
1728 | * Process control. The control connection is prioritised so we don't | |
1729 | * starve it with high throughput tracing data on the data | |
1730 | * connection. | |
1731 | */ | |
1732 | for (i = 0; i < nb_fd; i++) { | |
1733 | /* Fetch once the poll data */ | |
1734 | uint32_t revents = LTTNG_POLL_GETEV(&events, i); | |
1735 | int pollfd = LTTNG_POLL_GETFD(&events, i); | |
1736 | ||
eea7556c MD |
1737 | health_code_update(); |
1738 | ||
d3e2ba59 | 1739 | /* Thread quit pipe has been closed. Killing thread. */ |
2a174661 | 1740 | ret = check_live_conn_pipe(pollfd, revents); |
d3e2ba59 JD |
1741 | if (ret) { |
1742 | err = 0; | |
1743 | goto exit; | |
1744 | } | |
1745 | ||
58eb9381 DG |
1746 | /* Inspect the relay conn pipe for new connection */ |
1747 | if (pollfd == live_conn_pipe[0]) { | |
d3e2ba59 JD |
1748 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
1749 | ERR("Relay live pipe error"); | |
1750 | goto error; | |
1751 | } else if (revents & LPOLLIN) { | |
58eb9381 | 1752 | ret = lttng_read(live_conn_pipe[0], &conn, sizeof(conn)); |
d3e2ba59 JD |
1753 | if (ret < 0) { |
1754 | goto error; | |
1755 | } | |
58eb9381 DG |
1756 | conn->sessions_ht = sessions_ht; |
1757 | connection_init(conn); | |
1758 | lttng_poll_add(&events, conn->sock->fd, | |
1759 | LPOLLIN | LPOLLRDHUP); | |
1760 | rcu_read_lock(); | |
1761 | lttng_ht_add_unique_ulong(relay_connections_ht, | |
1762 | &conn->sock_n); | |
d3e2ba59 | 1763 | rcu_read_unlock(); |
58eb9381 | 1764 | DBG("Connection socket %d added", conn->sock->fd); |
d3e2ba59 | 1765 | } |
58eb9381 DG |
1766 | } else { |
1767 | rcu_read_lock(); | |
1768 | conn = connection_find_by_sock(relay_connections_ht, pollfd); | |
1769 | /* If not found, there is a synchronization issue. */ | |
1770 | assert(conn); | |
1771 | ||
1772 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1773 | cleanup_connection_pollfd(&events, pollfd); | |
1774 | destroy_connection(relay_connections_ht, conn); | |
d3e2ba59 | 1775 | } else if (revents & LPOLLIN) { |
58eb9381 DG |
1776 | ret = conn->sock->ops->recvmsg(conn->sock, &recv_hdr, |
1777 | sizeof(recv_hdr), 0); | |
d3e2ba59 | 1778 | if (ret <= 0) { |
58eb9381 DG |
1779 | /* Connection closed */ |
1780 | cleanup_connection_pollfd(&events, pollfd); | |
1781 | destroy_connection(relay_connections_ht, conn); | |
1782 | DBG("Viewer control conn closed with %d", pollfd); | |
d3e2ba59 | 1783 | } else { |
58eb9381 | 1784 | ret = process_control(&recv_hdr, conn); |
d3e2ba59 JD |
1785 | if (ret < 0) { |
1786 | /* Clear the session on error. */ | |
58eb9381 DG |
1787 | cleanup_connection_pollfd(&events, pollfd); |
1788 | destroy_connection(relay_connections_ht, conn); | |
d3e2ba59 JD |
1789 | DBG("Viewer connection closed with %d", pollfd); |
1790 | } | |
1791 | } | |
1792 | } | |
1793 | rcu_read_unlock(); | |
1794 | } | |
1795 | } | |
1796 | } | |
1797 | ||
1798 | exit: | |
1799 | error: | |
1800 | lttng_poll_clean(&events); | |
1801 | ||
58eb9381 | 1802 | /* Cleanup reamaining connection object. */ |
d3e2ba59 | 1803 | rcu_read_lock(); |
58eb9381 DG |
1804 | cds_lfht_for_each_entry(relay_connections_ht->ht, &iter.iter, conn, |
1805 | sock_n.node) { | |
eea7556c | 1806 | health_code_update(); |
58eb9381 | 1807 | destroy_connection(relay_connections_ht, conn); |
d3e2ba59 JD |
1808 | } |
1809 | rcu_read_unlock(); | |
1810 | error_poll_create: | |
1811 | lttng_ht_destroy(relay_connections_ht); | |
1812 | relay_connections_ht_error: | |
58eb9381 DG |
1813 | /* Close relay conn pipes */ |
1814 | utils_close_pipe(live_conn_pipe); | |
d3e2ba59 JD |
1815 | if (err) { |
1816 | DBG("Viewer worker thread exited with error"); | |
1817 | } | |
1818 | DBG("Viewer worker thread cleanup complete"); | |
9b5e0863 | 1819 | error_testpoint: |
eea7556c MD |
1820 | if (err) { |
1821 | health_error(); | |
1822 | ERR("Health error occurred in %s", __func__); | |
1823 | } | |
1824 | health_unregister(health_relayd); | |
d3e2ba59 JD |
1825 | stop_threads(); |
1826 | rcu_unregister_thread(); | |
1827 | return NULL; | |
1828 | } | |
1829 | ||
1830 | /* | |
1831 | * Create the relay command pipe to wake thread_manage_apps. | |
1832 | * Closed in cleanup(). | |
1833 | */ | |
58eb9381 | 1834 | static int create_conn_pipe(void) |
d3e2ba59 JD |
1835 | { |
1836 | int ret; | |
1837 | ||
58eb9381 | 1838 | ret = utils_create_pipe_cloexec(live_conn_pipe); |
d3e2ba59 JD |
1839 | |
1840 | return ret; | |
1841 | } | |
1842 | ||
aaec7998 | 1843 | void live_stop_threads(void) |
d3e2ba59 JD |
1844 | { |
1845 | int ret; | |
1846 | void *status; | |
1847 | ||
1848 | stop_threads(); | |
1849 | ||
1850 | ret = pthread_join(live_listener_thread, &status); | |
1851 | if (ret != 0) { | |
1852 | PERROR("pthread_join live listener"); | |
1853 | goto error; /* join error, exit without cleanup */ | |
1854 | } | |
1855 | ||
1856 | ret = pthread_join(live_worker_thread, &status); | |
1857 | if (ret != 0) { | |
1858 | PERROR("pthread_join live worker"); | |
1859 | goto error; /* join error, exit without cleanup */ | |
1860 | } | |
1861 | ||
1862 | ret = pthread_join(live_dispatcher_thread, &status); | |
1863 | if (ret != 0) { | |
1864 | PERROR("pthread_join live dispatcher"); | |
1865 | goto error; /* join error, exit without cleanup */ | |
1866 | } | |
1867 | ||
1868 | cleanup(); | |
1869 | ||
1870 | error: | |
1871 | return; | |
1872 | } | |
1873 | ||
1874 | /* | |
1875 | * main | |
1876 | */ | |
1877 | int live_start_threads(struct lttng_uri *uri, | |
0b242f62 | 1878 | struct relay_local_data *relay_ctx) |
d3e2ba59 JD |
1879 | { |
1880 | int ret = 0; | |
1881 | void *status; | |
1882 | int is_root; | |
1883 | ||
1884 | assert(uri); | |
1885 | live_uri = uri; | |
1886 | ||
d3e2ba59 JD |
1887 | /* Check if daemon is UID = 0 */ |
1888 | is_root = !getuid(); | |
1889 | ||
1890 | if (!is_root) { | |
1891 | if (live_uri->port < 1024) { | |
1892 | ERR("Need to be root to use ports < 1024"); | |
1893 | ret = -1; | |
1894 | goto exit; | |
1895 | } | |
1896 | } | |
1897 | ||
1898 | /* Setup the thread apps communication pipe. */ | |
58eb9381 | 1899 | if ((ret = create_conn_pipe()) < 0) { |
d3e2ba59 JD |
1900 | goto exit; |
1901 | } | |
1902 | ||
1903 | /* Init relay command queue. */ | |
58eb9381 | 1904 | cds_wfq_init(&viewer_conn_queue.queue); |
d3e2ba59 JD |
1905 | |
1906 | /* Set up max poll set size */ | |
1907 | lttng_poll_set_max_size(); | |
1908 | ||
1909 | /* Setup the dispatcher thread */ | |
1910 | ret = pthread_create(&live_dispatcher_thread, NULL, | |
1911 | thread_dispatcher, (void *) NULL); | |
1912 | if (ret != 0) { | |
1913 | PERROR("pthread_create viewer dispatcher"); | |
1914 | goto exit_dispatcher; | |
1915 | } | |
1916 | ||
1917 | /* Setup the worker thread */ | |
1918 | ret = pthread_create(&live_worker_thread, NULL, | |
1919 | thread_worker, relay_ctx); | |
1920 | if (ret != 0) { | |
1921 | PERROR("pthread_create viewer worker"); | |
1922 | goto exit_worker; | |
1923 | } | |
1924 | ||
1925 | /* Setup the listener thread */ | |
1926 | ret = pthread_create(&live_listener_thread, NULL, | |
1927 | thread_listener, (void *) NULL); | |
1928 | if (ret != 0) { | |
1929 | PERROR("pthread_create viewer listener"); | |
1930 | goto exit_listener; | |
1931 | } | |
1932 | ||
1933 | ret = 0; | |
1934 | goto end; | |
1935 | ||
1936 | exit_listener: | |
1937 | ret = pthread_join(live_listener_thread, &status); | |
1938 | if (ret != 0) { | |
1939 | PERROR("pthread_join live listener"); | |
1940 | goto error; /* join error, exit without cleanup */ | |
1941 | } | |
1942 | ||
1943 | exit_worker: | |
1944 | ret = pthread_join(live_worker_thread, &status); | |
1945 | if (ret != 0) { | |
1946 | PERROR("pthread_join live worker"); | |
1947 | goto error; /* join error, exit without cleanup */ | |
1948 | } | |
1949 | ||
1950 | exit_dispatcher: | |
1951 | ret = pthread_join(live_dispatcher_thread, &status); | |
1952 | if (ret != 0) { | |
1953 | PERROR("pthread_join live dispatcher"); | |
1954 | goto error; /* join error, exit without cleanup */ | |
1955 | } | |
1956 | ||
1957 | exit: | |
1958 | cleanup(); | |
1959 | ||
1960 | end: | |
1961 | error: | |
1962 | return ret; | |
1963 | } |