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> | |
f263b7fd | 46 | #include <common/compat/endian.h> |
d3e2ba59 JD |
47 | #include <common/defaults.h> |
48 | #include <common/futex.h> | |
2f8f53af | 49 | #include <common/index/index.h> |
d3e2ba59 JD |
50 | #include <common/sessiond-comm/sessiond-comm.h> |
51 | #include <common/sessiond-comm/inet.h> | |
52 | #include <common/sessiond-comm/relayd.h> | |
53 | #include <common/uri.h> | |
54 | #include <common/utils.h> | |
55 | ||
56 | #include "cmd.h" | |
57 | #include "live.h" | |
58 | #include "lttng-relayd.h" | |
d3e2ba59 | 59 | #include "utils.h" |
eea7556c | 60 | #include "health-relayd.h" |
9b5e0863 | 61 | #include "testpoint.h" |
2f8f53af | 62 | #include "viewer-stream.h" |
2a174661 DG |
63 | #include "stream.h" |
64 | #include "session.h" | |
65 | #include "ctf-trace.h" | |
58eb9381 | 66 | #include "connection.h" |
d3e2ba59 JD |
67 | |
68 | static struct lttng_uri *live_uri; | |
69 | ||
d3e2ba59 JD |
70 | /* |
71 | * This pipe is used to inform the worker thread that a command is queued and | |
72 | * ready to be processed. | |
73 | */ | |
58eb9381 | 74 | static int live_conn_pipe[2] = { -1, -1 }; |
d3e2ba59 JD |
75 | |
76 | /* Shared between threads */ | |
77 | static int live_dispatch_thread_exit; | |
78 | ||
79 | static pthread_t live_listener_thread; | |
80 | static pthread_t live_dispatcher_thread; | |
81 | static pthread_t live_worker_thread; | |
82 | ||
83 | /* | |
84 | * Relay command queue. | |
85 | * | |
86 | * The live_thread_listener and live_thread_dispatcher communicate with this | |
87 | * queue. | |
88 | */ | |
58eb9381 | 89 | static struct relay_conn_queue viewer_conn_queue; |
d3e2ba59 JD |
90 | |
91 | static uint64_t last_relay_viewer_session_id; | |
92 | ||
93 | /* | |
94 | * Cleanup the daemon | |
95 | */ | |
96 | static | |
97 | void cleanup(void) | |
98 | { | |
99 | DBG("Cleaning up"); | |
100 | ||
d3e2ba59 JD |
101 | free(live_uri); |
102 | } | |
103 | ||
2f8f53af DG |
104 | /* |
105 | * Receive a request buffer using a given socket, destination allocated buffer | |
106 | * of length size. | |
107 | * | |
108 | * Return the size of the received message or else a negative value on error | |
109 | * with errno being set by recvmsg() syscall. | |
110 | */ | |
111 | static | |
112 | ssize_t recv_request(struct lttcomm_sock *sock, void *buf, size_t size) | |
113 | { | |
114 | ssize_t ret; | |
115 | ||
116 | assert(sock); | |
117 | assert(buf); | |
118 | ||
119 | ret = sock->ops->recvmsg(sock, buf, size, 0); | |
120 | if (ret < 0 || ret != size) { | |
121 | if (ret == 0) { | |
122 | /* Orderly shutdown. Not necessary to print an error. */ | |
123 | DBG("Socket %d did an orderly shutdown", sock->fd); | |
124 | } else { | |
125 | ERR("Relay failed to receive request."); | |
126 | } | |
127 | ret = -1; | |
128 | } | |
129 | ||
130 | return ret; | |
131 | } | |
132 | ||
133 | /* | |
134 | * Send a response buffer using a given socket, source allocated buffer of | |
135 | * length size. | |
136 | * | |
137 | * Return the size of the sent message or else a negative value on error with | |
138 | * errno being set by sendmsg() syscall. | |
139 | */ | |
140 | static | |
141 | ssize_t send_response(struct lttcomm_sock *sock, void *buf, size_t size) | |
142 | { | |
143 | ssize_t ret; | |
144 | ||
145 | assert(sock); | |
146 | assert(buf); | |
147 | ||
148 | ret = sock->ops->sendmsg(sock, buf, size, 0); | |
149 | if (ret < 0) { | |
150 | ERR("Relayd failed to send response."); | |
151 | } | |
152 | ||
153 | return ret; | |
154 | } | |
155 | ||
156 | /* | |
f04a971b JD |
157 | * Atomically check if new streams got added in one of the sessions attached |
158 | * and reset the flag to 0. | |
2f8f53af DG |
159 | * |
160 | * Returns 1 if new streams got added, 0 if nothing changed, a negative value | |
161 | * on error. | |
162 | */ | |
163 | static | |
f04a971b | 164 | int check_new_streams(struct relay_connection *conn) |
2f8f53af | 165 | { |
2f8f53af | 166 | struct relay_session *session; |
f04a971b JD |
167 | unsigned long current_val; |
168 | int ret = 0; | |
2f8f53af | 169 | |
f04a971b JD |
170 | if (!conn->viewer_session) { |
171 | goto end; | |
172 | } | |
173 | cds_list_for_each_entry(session, | |
174 | &conn->viewer_session->sessions_head, | |
175 | viewer_session_list) { | |
176 | current_val = uatomic_cmpxchg(&session->new_streams, 1, 0); | |
177 | ret = current_val; | |
178 | if (ret == 1) { | |
179 | goto end; | |
180 | } | |
2f8f53af DG |
181 | } |
182 | ||
f04a971b | 183 | end: |
2f8f53af DG |
184 | return ret; |
185 | } | |
186 | ||
187 | /* | |
188 | * Send viewer streams to the given socket. The ignore_sent_flag indicates if | |
189 | * this function should ignore the sent flag or not. | |
190 | * | |
191 | * Return 0 on success or else a negative value. | |
192 | */ | |
193 | static | |
194 | ssize_t send_viewer_streams(struct lttcomm_sock *sock, | |
195 | struct relay_session *session, unsigned int ignore_sent_flag) | |
196 | { | |
197 | ssize_t ret; | |
198 | struct lttng_viewer_stream send_stream; | |
199 | struct lttng_ht_iter iter; | |
200 | struct relay_viewer_stream *vstream; | |
201 | ||
202 | assert(session); | |
203 | ||
204 | rcu_read_lock(); | |
205 | ||
206 | cds_lfht_for_each_entry(viewer_streams_ht->ht, &iter.iter, vstream, | |
207 | stream_n.node) { | |
2a174661 DG |
208 | struct ctf_trace *ctf_trace; |
209 | ||
2f8f53af DG |
210 | health_code_update(); |
211 | ||
212 | /* Ignore if not the same session. */ | |
213 | if (vstream->session_id != session->id || | |
214 | (!ignore_sent_flag && vstream->sent_flag)) { | |
215 | continue; | |
216 | } | |
217 | ||
2a174661 DG |
218 | ctf_trace = ctf_trace_find_by_path(session->ctf_traces_ht, |
219 | vstream->path_name); | |
220 | assert(ctf_trace); | |
221 | ||
2f8f53af | 222 | send_stream.id = htobe64(vstream->stream_handle); |
2a174661 | 223 | send_stream.ctf_trace_id = htobe64(ctf_trace->id); |
2f8f53af DG |
224 | send_stream.metadata_flag = htobe32(vstream->metadata_flag); |
225 | strncpy(send_stream.path_name, vstream->path_name, | |
226 | sizeof(send_stream.path_name)); | |
227 | strncpy(send_stream.channel_name, vstream->channel_name, | |
228 | sizeof(send_stream.channel_name)); | |
229 | ||
230 | DBG("Sending stream %" PRIu64 " to viewer", vstream->stream_handle); | |
231 | ret = send_response(sock, &send_stream, sizeof(send_stream)); | |
232 | if (ret < 0) { | |
233 | goto end_unlock; | |
234 | } | |
235 | vstream->sent_flag = 1; | |
236 | } | |
237 | ||
238 | ret = 0; | |
239 | ||
240 | end_unlock: | |
241 | rcu_read_unlock(); | |
242 | return ret; | |
243 | } | |
244 | ||
245 | /* | |
246 | * Create every viewer stream possible for the given session with the seek | |
247 | * type. Three counters *can* be return which are in order the total amount of | |
248 | * viewer stream of the session, the number of unsent stream and the number of | |
249 | * stream created. Those counters can be NULL and thus will be ignored. | |
250 | * | |
251 | * Return 0 on success or else a negative value. | |
252 | */ | |
253 | static | |
254 | int make_viewer_streams(struct relay_session *session, | |
255 | enum lttng_viewer_seek seek_t, uint32_t *nb_total, uint32_t *nb_unsent, | |
256 | uint32_t *nb_created) | |
257 | { | |
258 | int ret; | |
2f8f53af | 259 | struct lttng_ht_iter iter; |
2a174661 | 260 | struct ctf_trace *ctf_trace; |
2f8f53af DG |
261 | |
262 | assert(session); | |
263 | ||
264 | /* | |
265 | * This is to make sure we create viewer streams for a full received | |
266 | * channel. For instance, if we have 8 streams for a channel that are | |
267 | * concurrently being flagged ready, we can end up creating just a subset | |
268 | * of the 8 streams (the ones that are flagged). This lock avoids this | |
269 | * limbo state. | |
270 | */ | |
271 | pthread_mutex_lock(&session->viewer_ready_lock); | |
272 | ||
273 | /* | |
274 | * Create viewer streams for relay streams that are ready to be used for a | |
275 | * the given session id only. | |
276 | */ | |
2a174661 DG |
277 | rcu_read_lock(); |
278 | cds_lfht_for_each_entry(session->ctf_traces_ht->ht, &iter.iter, ctf_trace, | |
279 | node.node) { | |
280 | struct relay_stream *stream; | |
2f8f53af DG |
281 | |
282 | health_code_update(); | |
283 | ||
2a174661 | 284 | if (ctf_trace->invalid_flag) { |
2f8f53af DG |
285 | continue; |
286 | } | |
287 | ||
2a174661 DG |
288 | cds_list_for_each_entry(stream, &ctf_trace->stream_list, trace_list) { |
289 | struct relay_viewer_stream *vstream; | |
290 | ||
291 | if (!stream->viewer_ready) { | |
292 | continue; | |
293 | } | |
294 | ||
295 | vstream = viewer_stream_find_by_id(stream->stream_handle); | |
2f8f53af | 296 | if (!vstream) { |
2a174661 DG |
297 | vstream = viewer_stream_create(stream, seek_t, ctf_trace); |
298 | if (!vstream) { | |
299 | ret = -1; | |
300 | goto error_unlock; | |
301 | } | |
302 | /* Acquire reference to ctf_trace. */ | |
303 | ctf_trace_get_ref(ctf_trace); | |
304 | ||
305 | if (nb_created) { | |
306 | /* Update number of created stream counter. */ | |
307 | (*nb_created)++; | |
308 | } | |
309 | } else if (!vstream->sent_flag && nb_unsent) { | |
310 | /* Update number of unsent stream counter. */ | |
311 | (*nb_unsent)++; | |
2f8f53af | 312 | } |
2a174661 DG |
313 | /* Update number of total stream counter. */ |
314 | if (nb_total) { | |
315 | (*nb_total)++; | |
2f8f53af | 316 | } |
2f8f53af DG |
317 | } |
318 | } | |
319 | ||
320 | ret = 0; | |
321 | ||
322 | error_unlock: | |
2a174661 | 323 | rcu_read_unlock(); |
2f8f53af DG |
324 | pthread_mutex_unlock(&session->viewer_ready_lock); |
325 | return ret; | |
326 | } | |
327 | ||
d3e2ba59 JD |
328 | /* |
329 | * Write to writable pipe used to notify a thread. | |
330 | */ | |
331 | static | |
332 | int notify_thread_pipe(int wpipe) | |
333 | { | |
6cd525e8 | 334 | ssize_t ret; |
d3e2ba59 | 335 | |
6cd525e8 MD |
336 | ret = lttng_write(wpipe, "!", 1); |
337 | if (ret < 1) { | |
d3e2ba59 JD |
338 | PERROR("write poll pipe"); |
339 | } | |
340 | ||
6cd525e8 | 341 | return (int) ret; |
d3e2ba59 JD |
342 | } |
343 | ||
344 | /* | |
345 | * Stop all threads by closing the thread quit pipe. | |
346 | */ | |
347 | static | |
348 | void stop_threads(void) | |
349 | { | |
350 | int ret; | |
351 | ||
352 | /* Stopping all threads */ | |
353 | DBG("Terminating all live threads"); | |
bcf4a440 | 354 | ret = notify_thread_pipe(thread_quit_pipe[1]); |
d3e2ba59 JD |
355 | if (ret < 0) { |
356 | ERR("write error on thread quit pipe"); | |
357 | } | |
358 | ||
359 | /* Dispatch thread */ | |
360 | CMM_STORE_SHARED(live_dispatch_thread_exit, 1); | |
58eb9381 | 361 | futex_nto1_wake(&viewer_conn_queue.futex); |
d3e2ba59 JD |
362 | } |
363 | ||
d3e2ba59 JD |
364 | /* |
365 | * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set. | |
366 | */ | |
367 | static | |
368 | int create_thread_poll_set(struct lttng_poll_event *events, int size) | |
369 | { | |
370 | int ret; | |
371 | ||
372 | if (events == NULL || size == 0) { | |
373 | ret = -1; | |
374 | goto error; | |
375 | } | |
376 | ||
377 | ret = lttng_poll_create(events, size, LTTNG_CLOEXEC); | |
378 | if (ret < 0) { | |
379 | goto error; | |
380 | } | |
381 | ||
382 | /* Add quit pipe */ | |
bcf4a440 | 383 | ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN | LPOLLERR); |
d3e2ba59 JD |
384 | if (ret < 0) { |
385 | goto error; | |
386 | } | |
387 | ||
388 | return 0; | |
389 | ||
390 | error: | |
391 | return ret; | |
392 | } | |
393 | ||
394 | /* | |
395 | * Check if the thread quit pipe was triggered. | |
396 | * | |
397 | * Return 1 if it was triggered else 0; | |
398 | */ | |
399 | static | |
bcf4a440 | 400 | int check_thread_quit_pipe(int fd, uint32_t events) |
d3e2ba59 | 401 | { |
bcf4a440 | 402 | if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) { |
d3e2ba59 JD |
403 | return 1; |
404 | } | |
405 | ||
406 | return 0; | |
407 | } | |
408 | ||
409 | /* | |
410 | * Create and init socket from uri. | |
411 | */ | |
412 | static | |
413 | struct lttcomm_sock *init_socket(struct lttng_uri *uri) | |
414 | { | |
415 | int ret; | |
416 | struct lttcomm_sock *sock = NULL; | |
417 | ||
418 | sock = lttcomm_alloc_sock_from_uri(uri); | |
419 | if (sock == NULL) { | |
420 | ERR("Allocating socket"); | |
421 | goto error; | |
422 | } | |
423 | ||
424 | ret = lttcomm_create_sock(sock); | |
425 | if (ret < 0) { | |
426 | goto error; | |
427 | } | |
428 | DBG("Listening on sock %d for live", sock->fd); | |
429 | ||
430 | ret = sock->ops->bind(sock); | |
431 | if (ret < 0) { | |
432 | goto error; | |
433 | } | |
434 | ||
435 | ret = sock->ops->listen(sock, -1); | |
436 | if (ret < 0) { | |
437 | goto error; | |
438 | ||
439 | } | |
440 | ||
441 | return sock; | |
442 | ||
443 | error: | |
444 | if (sock) { | |
445 | lttcomm_destroy_sock(sock); | |
446 | } | |
447 | return NULL; | |
448 | } | |
449 | ||
450 | /* | |
451 | * This thread manages the listening for new connections on the network | |
452 | */ | |
453 | static | |
454 | void *thread_listener(void *data) | |
455 | { | |
456 | int i, ret, pollfd, err = -1; | |
d3e2ba59 JD |
457 | uint32_t revents, nb_fd; |
458 | struct lttng_poll_event events; | |
459 | struct lttcomm_sock *live_control_sock; | |
460 | ||
461 | DBG("[thread] Relay live listener started"); | |
462 | ||
eea7556c MD |
463 | health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_LISTENER); |
464 | ||
465 | health_code_update(); | |
466 | ||
d3e2ba59 JD |
467 | live_control_sock = init_socket(live_uri); |
468 | if (!live_control_sock) { | |
469 | goto error_sock_control; | |
470 | } | |
471 | ||
fb4d42ab | 472 | /* Pass 2 as size here for the thread quit pipe and control sockets. */ |
d3e2ba59 JD |
473 | ret = create_thread_poll_set(&events, 2); |
474 | if (ret < 0) { | |
475 | goto error_create_poll; | |
476 | } | |
477 | ||
478 | /* Add the control socket */ | |
479 | ret = lttng_poll_add(&events, live_control_sock->fd, LPOLLIN | LPOLLRDHUP); | |
480 | if (ret < 0) { | |
481 | goto error_poll_add; | |
482 | } | |
483 | ||
3fd27398 MD |
484 | lttng_relay_notify_ready(); |
485 | ||
9b5e0863 MD |
486 | if (testpoint(relayd_thread_live_listener)) { |
487 | goto error_testpoint; | |
488 | } | |
489 | ||
d3e2ba59 | 490 | while (1) { |
eea7556c MD |
491 | health_code_update(); |
492 | ||
d3e2ba59 JD |
493 | DBG("Listener accepting live viewers connections"); |
494 | ||
495 | restart: | |
eea7556c | 496 | health_poll_entry(); |
d3e2ba59 | 497 | ret = lttng_poll_wait(&events, -1); |
eea7556c | 498 | health_poll_exit(); |
d3e2ba59 JD |
499 | if (ret < 0) { |
500 | /* | |
501 | * Restart interrupted system call. | |
502 | */ | |
503 | if (errno == EINTR) { | |
504 | goto restart; | |
505 | } | |
506 | goto error; | |
507 | } | |
508 | nb_fd = ret; | |
509 | ||
510 | DBG("Relay new viewer connection received"); | |
511 | for (i = 0; i < nb_fd; i++) { | |
eea7556c MD |
512 | health_code_update(); |
513 | ||
d3e2ba59 JD |
514 | /* Fetch once the poll data */ |
515 | revents = LTTNG_POLL_GETEV(&events, i); | |
516 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
517 | ||
518 | /* Thread quit pipe has been closed. Killing thread. */ | |
bcf4a440 | 519 | ret = check_thread_quit_pipe(pollfd, revents); |
d3e2ba59 JD |
520 | if (ret) { |
521 | err = 0; | |
522 | goto exit; | |
523 | } | |
524 | ||
525 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
526 | ERR("socket poll error"); | |
527 | goto error; | |
528 | } else if (revents & LPOLLIN) { | |
529 | /* | |
530 | * Get allocated in this thread, enqueued to a global queue, | |
531 | * dequeued and freed in the worker thread. | |
532 | */ | |
58eb9381 DG |
533 | int val = 1; |
534 | struct relay_connection *new_conn; | |
d3e2ba59 JD |
535 | struct lttcomm_sock *newsock; |
536 | ||
58eb9381 DG |
537 | new_conn = connection_create(); |
538 | if (!new_conn) { | |
d3e2ba59 JD |
539 | goto error; |
540 | } | |
541 | ||
d3e2ba59 JD |
542 | newsock = live_control_sock->ops->accept(live_control_sock); |
543 | if (!newsock) { | |
544 | PERROR("accepting control sock"); | |
58eb9381 | 545 | connection_free(new_conn); |
d3e2ba59 JD |
546 | goto error; |
547 | } | |
548 | DBG("Relay viewer connection accepted socket %d", newsock->fd); | |
58eb9381 | 549 | |
d3e2ba59 | 550 | ret = setsockopt(newsock->fd, SOL_SOCKET, SO_REUSEADDR, &val, |
58eb9381 | 551 | sizeof(val)); |
d3e2ba59 JD |
552 | if (ret < 0) { |
553 | PERROR("setsockopt inet"); | |
554 | lttcomm_destroy_sock(newsock); | |
58eb9381 | 555 | connection_free(new_conn); |
d3e2ba59 JD |
556 | goto error; |
557 | } | |
58eb9381 | 558 | new_conn->sock = newsock; |
d3e2ba59 | 559 | |
58eb9381 DG |
560 | /* Enqueue request for the dispatcher thread. */ |
561 | cds_wfq_enqueue(&viewer_conn_queue.queue, &new_conn->qnode); | |
d3e2ba59 JD |
562 | |
563 | /* | |
58eb9381 DG |
564 | * Wake the dispatch queue futex. Implicit memory barrier with |
565 | * the exchange in cds_wfq_enqueue. | |
d3e2ba59 | 566 | */ |
58eb9381 | 567 | futex_nto1_wake(&viewer_conn_queue.futex); |
d3e2ba59 JD |
568 | } |
569 | } | |
570 | } | |
571 | ||
572 | exit: | |
573 | error: | |
574 | error_poll_add: | |
9b5e0863 | 575 | error_testpoint: |
d3e2ba59 JD |
576 | lttng_poll_clean(&events); |
577 | error_create_poll: | |
578 | if (live_control_sock->fd >= 0) { | |
579 | ret = live_control_sock->ops->close(live_control_sock); | |
580 | if (ret) { | |
581 | PERROR("close"); | |
582 | } | |
583 | } | |
584 | lttcomm_destroy_sock(live_control_sock); | |
585 | error_sock_control: | |
586 | if (err) { | |
eea7556c | 587 | health_error(); |
d3e2ba59 JD |
588 | DBG("Live viewer listener thread exited with error"); |
589 | } | |
eea7556c | 590 | health_unregister(health_relayd); |
d3e2ba59 JD |
591 | DBG("Live viewer listener thread cleanup complete"); |
592 | stop_threads(); | |
593 | return NULL; | |
594 | } | |
595 | ||
596 | /* | |
597 | * This thread manages the dispatching of the requests to worker threads | |
598 | */ | |
599 | static | |
600 | void *thread_dispatcher(void *data) | |
601 | { | |
6cd525e8 MD |
602 | int err = -1; |
603 | ssize_t ret; | |
d3e2ba59 | 604 | struct cds_wfq_node *node; |
58eb9381 | 605 | struct relay_connection *conn = NULL; |
d3e2ba59 JD |
606 | |
607 | DBG("[thread] Live viewer relay dispatcher started"); | |
608 | ||
eea7556c MD |
609 | health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_DISPATCHER); |
610 | ||
9b5e0863 MD |
611 | if (testpoint(relayd_thread_live_dispatcher)) { |
612 | goto error_testpoint; | |
613 | } | |
614 | ||
eea7556c MD |
615 | health_code_update(); |
616 | ||
d3e2ba59 | 617 | while (!CMM_LOAD_SHARED(live_dispatch_thread_exit)) { |
eea7556c MD |
618 | health_code_update(); |
619 | ||
d3e2ba59 | 620 | /* Atomically prepare the queue futex */ |
58eb9381 | 621 | futex_nto1_prepare(&viewer_conn_queue.futex); |
d3e2ba59 JD |
622 | |
623 | do { | |
eea7556c MD |
624 | health_code_update(); |
625 | ||
d3e2ba59 | 626 | /* Dequeue commands */ |
58eb9381 | 627 | node = cds_wfq_dequeue_blocking(&viewer_conn_queue.queue); |
d3e2ba59 JD |
628 | if (node == NULL) { |
629 | DBG("Woken up but nothing in the live-viewer " | |
630 | "relay command queue"); | |
631 | /* Continue thread execution */ | |
632 | break; | |
633 | } | |
58eb9381 | 634 | conn = caa_container_of(node, struct relay_connection, qnode); |
d3e2ba59 | 635 | DBG("Dispatching viewer request waiting on sock %d", |
58eb9381 | 636 | conn->sock->fd); |
d3e2ba59 JD |
637 | |
638 | /* | |
639 | * Inform worker thread of the new request. This call is blocking | |
640 | * so we can be assured that the data will be read at some point in | |
641 | * time or wait to the end of the world :) | |
642 | */ | |
58eb9381 DG |
643 | ret = lttng_write(live_conn_pipe[1], &conn, sizeof(conn)); |
644 | if (ret < 0) { | |
645 | PERROR("write conn pipe"); | |
646 | connection_destroy(conn); | |
d3e2ba59 JD |
647 | goto error; |
648 | } | |
649 | } while (node != NULL); | |
650 | ||
651 | /* Futex wait on queue. Blocking call on futex() */ | |
eea7556c | 652 | health_poll_entry(); |
58eb9381 | 653 | futex_nto1_wait(&viewer_conn_queue.futex); |
eea7556c | 654 | health_poll_exit(); |
d3e2ba59 JD |
655 | } |
656 | ||
eea7556c MD |
657 | /* Normal exit, no error */ |
658 | err = 0; | |
659 | ||
d3e2ba59 | 660 | error: |
9b5e0863 | 661 | error_testpoint: |
eea7556c MD |
662 | if (err) { |
663 | health_error(); | |
664 | ERR("Health error occurred in %s", __func__); | |
665 | } | |
666 | health_unregister(health_relayd); | |
d3e2ba59 JD |
667 | DBG("Live viewer dispatch thread dying"); |
668 | stop_threads(); | |
669 | return NULL; | |
670 | } | |
671 | ||
672 | /* | |
673 | * Establish connection with the viewer and check the versions. | |
674 | * | |
675 | * Return 0 on success or else negative value. | |
676 | */ | |
677 | static | |
58eb9381 | 678 | int viewer_connect(struct relay_connection *conn) |
d3e2ba59 JD |
679 | { |
680 | int ret; | |
681 | struct lttng_viewer_connect reply, msg; | |
682 | ||
58eb9381 | 683 | assert(conn); |
d3e2ba59 | 684 | |
58eb9381 | 685 | conn->version_check_done = 1; |
d3e2ba59 | 686 | |
eea7556c MD |
687 | health_code_update(); |
688 | ||
2f8f53af DG |
689 | DBG("Viewer is establishing a connection to the relayd."); |
690 | ||
58eb9381 | 691 | ret = recv_request(conn->sock, &msg, sizeof(msg)); |
2f8f53af | 692 | if (ret < 0) { |
d3e2ba59 JD |
693 | goto end; |
694 | } | |
695 | ||
eea7556c MD |
696 | health_code_update(); |
697 | ||
f46b2ce6 | 698 | memset(&reply, 0, sizeof(reply)); |
d3e2ba59 JD |
699 | reply.major = RELAYD_VERSION_COMM_MAJOR; |
700 | reply.minor = RELAYD_VERSION_COMM_MINOR; | |
701 | ||
702 | /* Major versions must be the same */ | |
703 | if (reply.major != be32toh(msg.major)) { | |
2f8f53af DG |
704 | DBG("Incompatible major versions ([relayd] %u vs [client] %u)", |
705 | reply.major, be32toh(msg.major)); | |
72180669 | 706 | ret = -1; |
d3e2ba59 JD |
707 | goto end; |
708 | } | |
709 | ||
58eb9381 | 710 | conn->major = reply.major; |
d3e2ba59 JD |
711 | /* We adapt to the lowest compatible version */ |
712 | if (reply.minor <= be32toh(msg.minor)) { | |
58eb9381 | 713 | conn->minor = reply.minor; |
d3e2ba59 | 714 | } else { |
58eb9381 | 715 | conn->minor = be32toh(msg.minor); |
d3e2ba59 JD |
716 | } |
717 | ||
c4e361a4 | 718 | if (be32toh(msg.type) == LTTNG_VIEWER_CLIENT_COMMAND) { |
58eb9381 | 719 | conn->type = RELAY_VIEWER_COMMAND; |
c4e361a4 | 720 | } else if (be32toh(msg.type) == LTTNG_VIEWER_CLIENT_NOTIFICATION) { |
58eb9381 | 721 | conn->type = RELAY_VIEWER_NOTIFICATION; |
d3e2ba59 JD |
722 | } else { |
723 | ERR("Unknown connection type : %u", be32toh(msg.type)); | |
724 | ret = -1; | |
725 | goto end; | |
726 | } | |
727 | ||
728 | reply.major = htobe32(reply.major); | |
729 | reply.minor = htobe32(reply.minor); | |
58eb9381 | 730 | if (conn->type == RELAY_VIEWER_COMMAND) { |
d3e2ba59 JD |
731 | reply.viewer_session_id = htobe64(++last_relay_viewer_session_id); |
732 | } | |
eea7556c MD |
733 | |
734 | health_code_update(); | |
735 | ||
58eb9381 | 736 | ret = send_response(conn->sock, &reply, sizeof(reply)); |
d3e2ba59 | 737 | if (ret < 0) { |
2f8f53af | 738 | goto end; |
d3e2ba59 JD |
739 | } |
740 | ||
eea7556c MD |
741 | health_code_update(); |
742 | ||
58eb9381 | 743 | DBG("Version check done using protocol %u.%u", conn->major, conn->minor); |
d3e2ba59 JD |
744 | ret = 0; |
745 | ||
746 | end: | |
747 | return ret; | |
748 | } | |
749 | ||
750 | /* | |
751 | * Send the viewer the list of current sessions. | |
752 | * | |
753 | * Return 0 on success or else a negative value. | |
754 | */ | |
755 | static | |
58eb9381 | 756 | int viewer_list_sessions(struct relay_connection *conn) |
d3e2ba59 JD |
757 | { |
758 | int ret; | |
759 | struct lttng_viewer_list_sessions session_list; | |
760 | unsigned long count; | |
761 | long approx_before, approx_after; | |
d3e2ba59 JD |
762 | struct lttng_ht_iter iter; |
763 | struct lttng_viewer_session send_session; | |
764 | struct relay_session *session; | |
765 | ||
766 | DBG("List sessions received"); | |
767 | ||
d3e2ba59 | 768 | rcu_read_lock(); |
58eb9381 DG |
769 | cds_lfht_count_nodes(conn->sessions_ht->ht, &approx_before, &count, |
770 | &approx_after); | |
d3e2ba59 JD |
771 | session_list.sessions_count = htobe32(count); |
772 | ||
eea7556c MD |
773 | health_code_update(); |
774 | ||
58eb9381 | 775 | ret = send_response(conn->sock, &session_list, sizeof(session_list)); |
d3e2ba59 | 776 | if (ret < 0) { |
d3e2ba59 JD |
777 | goto end_unlock; |
778 | } | |
779 | ||
eea7556c MD |
780 | health_code_update(); |
781 | ||
58eb9381 | 782 | cds_lfht_for_each_entry(conn->sessions_ht->ht, &iter.iter, session, |
2f8f53af | 783 | session_n.node) { |
eea7556c MD |
784 | health_code_update(); |
785 | ||
d3e2ba59 JD |
786 | strncpy(send_session.session_name, session->session_name, |
787 | sizeof(send_session.session_name)); | |
788 | strncpy(send_session.hostname, session->hostname, | |
789 | sizeof(send_session.hostname)); | |
790 | send_session.id = htobe64(session->id); | |
791 | send_session.live_timer = htobe32(session->live_timer); | |
2a174661 | 792 | send_session.clients = htobe32(session->viewer_refcount); |
87b576ec | 793 | send_session.streams = htobe32(session->stream_count); |
d3e2ba59 | 794 | |
eea7556c MD |
795 | health_code_update(); |
796 | ||
58eb9381 | 797 | ret = send_response(conn->sock, &send_session, sizeof(send_session)); |
d3e2ba59 | 798 | if (ret < 0) { |
d3e2ba59 JD |
799 | goto end_unlock; |
800 | } | |
801 | } | |
eea7556c MD |
802 | health_code_update(); |
803 | ||
d3e2ba59 JD |
804 | rcu_read_unlock(); |
805 | ret = 0; | |
806 | goto end; | |
807 | ||
808 | end_unlock: | |
809 | rcu_read_unlock(); | |
810 | ||
811 | end: | |
d3e2ba59 JD |
812 | return ret; |
813 | } | |
814 | ||
6763619c JD |
815 | /* |
816 | * Check if a connection is attached to a session. | |
817 | * Return 1 if attached, 0 if not attached, a negative value on error. | |
818 | */ | |
819 | static | |
820 | int session_attached(struct relay_connection *conn, uint64_t session_id) | |
821 | { | |
822 | struct relay_session *session; | |
823 | int found = 0; | |
824 | ||
825 | if (!conn->viewer_session) { | |
826 | goto end; | |
827 | } | |
828 | cds_list_for_each_entry(session, | |
829 | &conn->viewer_session->sessions_head, | |
830 | viewer_session_list) { | |
831 | if (session->id == session_id) { | |
832 | found = 1; | |
833 | goto end; | |
834 | } | |
835 | } | |
836 | ||
837 | end: | |
838 | return found; | |
839 | } | |
840 | ||
d227d5bd JD |
841 | /* |
842 | * Delete all streams for a specific session ID. | |
843 | */ | |
844 | static void destroy_viewer_streams_by_session(struct relay_session *session) | |
845 | { | |
846 | struct relay_viewer_stream *stream; | |
847 | struct lttng_ht_iter iter; | |
848 | ||
849 | assert(session); | |
850 | ||
851 | rcu_read_lock(); | |
852 | cds_lfht_for_each_entry(viewer_streams_ht->ht, &iter.iter, stream, | |
853 | stream_n.node) { | |
854 | struct ctf_trace *ctf_trace; | |
855 | ||
856 | health_code_update(); | |
857 | if (stream->session_id != session->id) { | |
858 | continue; | |
859 | } | |
860 | ||
861 | ctf_trace = ctf_trace_find_by_path(session->ctf_traces_ht, | |
862 | stream->path_name); | |
863 | assert(ctf_trace); | |
864 | ||
865 | viewer_stream_delete(stream); | |
866 | ||
867 | if (stream->metadata_flag) { | |
868 | ctf_trace->metadata_sent = 0; | |
869 | ctf_trace->viewer_metadata_stream = NULL; | |
870 | } | |
871 | ||
872 | viewer_stream_destroy(ctf_trace, stream); | |
873 | } | |
874 | rcu_read_unlock(); | |
875 | } | |
876 | ||
877 | static void try_destroy_streams(struct relay_session *session) | |
878 | { | |
879 | struct ctf_trace *ctf_trace; | |
880 | struct lttng_ht_iter iter; | |
881 | ||
882 | assert(session); | |
883 | ||
884 | cds_lfht_for_each_entry(session->ctf_traces_ht->ht, &iter.iter, ctf_trace, | |
885 | node.node) { | |
886 | /* Attempt to destroy the ctf trace of that session. */ | |
887 | ctf_trace_try_destroy(session, ctf_trace); | |
888 | } | |
889 | } | |
890 | ||
891 | /* | |
892 | * Cleanup a session. | |
893 | */ | |
894 | static void cleanup_session(struct relay_connection *conn, | |
895 | struct relay_session *session) | |
896 | { | |
897 | /* | |
898 | * Very important that this is done before destroying the session so we | |
899 | * can put back every viewer stream reference from the ctf_trace. | |
900 | */ | |
901 | destroy_viewer_streams_by_session(session); | |
902 | try_destroy_streams(session); | |
903 | cds_list_del(&session->viewer_session_list); | |
904 | session_viewer_try_destroy(conn->sessions_ht, session); | |
905 | } | |
906 | ||
80e8027a JD |
907 | /* |
908 | * Send the viewer the list of current sessions. | |
909 | */ | |
910 | static | |
58eb9381 | 911 | int viewer_get_new_streams(struct relay_connection *conn) |
80e8027a JD |
912 | { |
913 | int ret, send_streams = 0; | |
2f8f53af | 914 | uint32_t nb_created = 0, nb_unsent = 0, nb_streams = 0; |
80e8027a JD |
915 | struct lttng_viewer_new_streams_request request; |
916 | struct lttng_viewer_new_streams_response response; | |
80e8027a | 917 | struct relay_session *session; |
6763619c | 918 | uint64_t session_id; |
80e8027a | 919 | |
58eb9381 | 920 | assert(conn); |
80e8027a JD |
921 | |
922 | DBG("Get new streams received"); | |
923 | ||
80e8027a JD |
924 | health_code_update(); |
925 | ||
2f8f53af | 926 | /* Receive the request from the connected client. */ |
58eb9381 | 927 | ret = recv_request(conn->sock, &request, sizeof(request)); |
2f8f53af | 928 | if (ret < 0) { |
80e8027a JD |
929 | goto error; |
930 | } | |
6763619c | 931 | session_id = be64toh(request.session_id); |
80e8027a JD |
932 | |
933 | health_code_update(); | |
934 | ||
53efb85a MD |
935 | memset(&response, 0, sizeof(response)); |
936 | ||
80e8027a | 937 | rcu_read_lock(); |
6763619c | 938 | session = session_find_by_id(conn->sessions_ht, session_id); |
2f8f53af | 939 | if (!session) { |
6763619c | 940 | DBG("Relay session %" PRIu64 " not found", session_id); |
c4e361a4 | 941 | response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_ERR); |
80e8027a JD |
942 | goto send_reply; |
943 | } | |
944 | ||
6763619c | 945 | if (!session_attached(conn, session_id)) { |
80e8027a | 946 | send_streams = 0; |
c4e361a4 | 947 | response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_ERR); |
80e8027a JD |
948 | goto send_reply; |
949 | } | |
950 | ||
6763619c JD |
951 | send_streams = 1; |
952 | response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_OK); | |
953 | ||
c4e361a4 | 954 | ret = make_viewer_streams(session, LTTNG_VIEWER_SEEK_LAST, NULL, &nb_unsent, |
2f8f53af DG |
955 | &nb_created); |
956 | if (ret < 0) { | |
957 | goto end_unlock; | |
958 | } | |
959 | /* Only send back the newly created streams with the unsent ones. */ | |
960 | nb_streams = nb_created + nb_unsent; | |
80e8027a JD |
961 | response.streams_count = htobe32(nb_streams); |
962 | ||
4479f682 JD |
963 | /* |
964 | * If the session is closed and we have no new streams to send, | |
965 | * it means that the viewer has already received the whole trace | |
966 | * for this session and should now close it. | |
967 | */ | |
968 | if (nb_streams == 0 && session->close_flag) { | |
969 | send_streams = 0; | |
970 | response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_HUP); | |
6763619c JD |
971 | /* |
972 | * Remove the session from the attached list of the connection | |
973 | * and try to destroy it. | |
974 | */ | |
975 | cds_list_del(&session->viewer_session_list); | |
d227d5bd | 976 | cleanup_session(conn, session); |
4479f682 JD |
977 | goto send_reply; |
978 | } | |
979 | ||
80e8027a JD |
980 | send_reply: |
981 | health_code_update(); | |
58eb9381 | 982 | ret = send_response(conn->sock, &response, sizeof(response)); |
80e8027a | 983 | if (ret < 0) { |
80e8027a JD |
984 | goto end_unlock; |
985 | } | |
986 | health_code_update(); | |
987 | ||
988 | /* | |
989 | * Unknown or empty session, just return gracefully, the viewer knows what | |
990 | * is happening. | |
991 | */ | |
992 | if (!send_streams || !nb_streams) { | |
993 | ret = 0; | |
994 | goto end_unlock; | |
995 | } | |
996 | ||
2f8f53af DG |
997 | /* |
998 | * Send stream and *DON'T* ignore the sent flag so every viewer streams | |
999 | * that were not sent from that point will be sent to the viewer. | |
1000 | */ | |
58eb9381 | 1001 | ret = send_viewer_streams(conn->sock, session, 0); |
2f8f53af DG |
1002 | if (ret < 0) { |
1003 | goto end_unlock; | |
80e8027a JD |
1004 | } |
1005 | ||
80e8027a JD |
1006 | end_unlock: |
1007 | rcu_read_unlock(); | |
80e8027a JD |
1008 | error: |
1009 | return ret; | |
1010 | } | |
1011 | ||
d3e2ba59 JD |
1012 | /* |
1013 | * Send the viewer the list of current sessions. | |
1014 | */ | |
1015 | static | |
58eb9381 | 1016 | int viewer_attach_session(struct relay_connection *conn) |
d3e2ba59 | 1017 | { |
2f8f53af DG |
1018 | int send_streams = 0; |
1019 | ssize_t ret; | |
80e8027a | 1020 | uint32_t nb_streams = 0; |
2f8f53af | 1021 | enum lttng_viewer_seek seek_type; |
d3e2ba59 JD |
1022 | struct lttng_viewer_attach_session_request request; |
1023 | struct lttng_viewer_attach_session_response response; | |
d3e2ba59 JD |
1024 | struct relay_session *session; |
1025 | ||
58eb9381 | 1026 | assert(conn); |
d3e2ba59 | 1027 | |
eea7556c MD |
1028 | health_code_update(); |
1029 | ||
2f8f53af | 1030 | /* Receive the request from the connected client. */ |
58eb9381 | 1031 | ret = recv_request(conn->sock, &request, sizeof(request)); |
2f8f53af | 1032 | if (ret < 0) { |
d3e2ba59 JD |
1033 | goto error; |
1034 | } | |
1035 | ||
eea7556c MD |
1036 | health_code_update(); |
1037 | ||
53efb85a MD |
1038 | memset(&response, 0, sizeof(response)); |
1039 | ||
c3b7390b JD |
1040 | if (!conn->viewer_session) { |
1041 | DBG("Client trying to attach before creating a live viewer session"); | |
1042 | response.status = htobe32(LTTNG_VIEWER_ATTACH_NO_SESSION); | |
1043 | goto send_reply; | |
1044 | } | |
1045 | ||
d3e2ba59 | 1046 | rcu_read_lock(); |
58eb9381 DG |
1047 | session = session_find_by_id(conn->sessions_ht, |
1048 | be64toh(request.session_id)); | |
2f8f53af | 1049 | if (!session) { |
d3e2ba59 JD |
1050 | DBG("Relay session %" PRIu64 " not found", |
1051 | be64toh(request.session_id)); | |
c4e361a4 | 1052 | response.status = htobe32(LTTNG_VIEWER_ATTACH_UNK); |
d3e2ba59 JD |
1053 | goto send_reply; |
1054 | } | |
2a174661 DG |
1055 | session_viewer_attach(session); |
1056 | DBG("Attach session ID %" PRIu64 " received", be64toh(request.session_id)); | |
d3e2ba59 | 1057 | |
2a174661 | 1058 | if (uatomic_read(&session->viewer_refcount) > 1) { |
d3e2ba59 | 1059 | DBG("Already a viewer attached"); |
c4e361a4 | 1060 | response.status = htobe32(LTTNG_VIEWER_ATTACH_ALREADY); |
2a174661 | 1061 | session_viewer_detach(session); |
d3e2ba59 JD |
1062 | goto send_reply; |
1063 | } else if (session->live_timer == 0) { | |
1064 | DBG("Not live session"); | |
c4e361a4 | 1065 | response.status = htobe32(LTTNG_VIEWER_ATTACH_NOT_LIVE); |
d3e2ba59 JD |
1066 | goto send_reply; |
1067 | } else { | |
d3e2ba59 | 1068 | send_streams = 1; |
c4e361a4 | 1069 | response.status = htobe32(LTTNG_VIEWER_ATTACH_OK); |
6763619c JD |
1070 | cds_list_add(&session->viewer_session_list, |
1071 | &conn->viewer_session->sessions_head); | |
d3e2ba59 JD |
1072 | } |
1073 | ||
1074 | switch (be32toh(request.seek)) { | |
c4e361a4 JD |
1075 | case LTTNG_VIEWER_SEEK_BEGINNING: |
1076 | case LTTNG_VIEWER_SEEK_LAST: | |
2f8f53af | 1077 | seek_type = be32toh(request.seek); |
d3e2ba59 JD |
1078 | break; |
1079 | default: | |
1080 | ERR("Wrong seek parameter"); | |
c4e361a4 | 1081 | response.status = htobe32(LTTNG_VIEWER_ATTACH_SEEK_ERR); |
d3e2ba59 JD |
1082 | send_streams = 0; |
1083 | goto send_reply; | |
1084 | } | |
1085 | ||
2f8f53af DG |
1086 | ret = make_viewer_streams(session, seek_type, &nb_streams, NULL, NULL); |
1087 | if (ret < 0) { | |
1088 | goto end_unlock; | |
d3e2ba59 | 1089 | } |
2f8f53af | 1090 | response.streams_count = htobe32(nb_streams); |
d3e2ba59 JD |
1091 | |
1092 | send_reply: | |
eea7556c | 1093 | health_code_update(); |
58eb9381 | 1094 | ret = send_response(conn->sock, &response, sizeof(response)); |
d3e2ba59 | 1095 | if (ret < 0) { |
d3e2ba59 JD |
1096 | goto end_unlock; |
1097 | } | |
eea7556c | 1098 | health_code_update(); |
d3e2ba59 JD |
1099 | |
1100 | /* | |
157df586 | 1101 | * Unknown or empty session, just return gracefully, the viewer knows what |
d3e2ba59 JD |
1102 | * is happening. |
1103 | */ | |
157df586 | 1104 | if (!send_streams || !nb_streams) { |
d3e2ba59 JD |
1105 | ret = 0; |
1106 | goto end_unlock; | |
1107 | } | |
1108 | ||
2f8f53af | 1109 | /* Send stream and ignore the sent flag. */ |
58eb9381 | 1110 | ret = send_viewer_streams(conn->sock, session, 1); |
2f8f53af DG |
1111 | if (ret < 0) { |
1112 | goto end_unlock; | |
d3e2ba59 | 1113 | } |
d3e2ba59 JD |
1114 | |
1115 | end_unlock: | |
1116 | rcu_read_unlock(); | |
4a9daf17 JD |
1117 | error: |
1118 | return ret; | |
1119 | } | |
1120 | ||
878c34cf DG |
1121 | /* |
1122 | * Open the index file if needed for the given vstream. | |
1123 | * | |
1124 | * If an index file is successfully opened, the index_read_fd of the stream is | |
1125 | * set with it. | |
1126 | * | |
1127 | * Return 0 on success, a negative value on error (-ENOENT if not ready yet). | |
1128 | */ | |
1129 | static int try_open_index(struct relay_viewer_stream *vstream, | |
1130 | struct relay_stream *rstream) | |
1131 | { | |
1132 | int ret = 0; | |
1133 | ||
1134 | assert(vstream); | |
1135 | assert(rstream); | |
1136 | ||
1137 | if (vstream->index_read_fd >= 0) { | |
1138 | goto end; | |
1139 | } | |
1140 | ||
1141 | /* | |
1142 | * First time, we open the index file and at least one index is ready. The | |
1143 | * race between the read and write of the total_index_received is | |
1144 | * acceptable here since the client will be notified to simply come back | |
1145 | * and get the next index. | |
1146 | */ | |
1147 | if (rstream->total_index_received <= 0) { | |
1148 | ret = -ENOENT; | |
1149 | goto end; | |
1150 | } | |
1151 | ret = index_open(vstream->path_name, vstream->channel_name, | |
1152 | vstream->tracefile_count, vstream->tracefile_count_current); | |
1153 | if (ret >= 0) { | |
1154 | vstream->index_read_fd = ret; | |
1155 | ret = 0; | |
1156 | goto end; | |
1157 | } | |
1158 | ||
1159 | end: | |
1160 | return ret; | |
1161 | } | |
1162 | ||
1163 | /* | |
1164 | * Check the status of the index for the given stream. This function updates | |
1165 | * the index structure if needed and can destroy the vstream also for the HUP | |
1166 | * situation. | |
1167 | * | |
1168 | * Return 0 means that we can proceed with the index. A value of 1 means that | |
1169 | * the index has been updated and is ready to be send to the client. A negative | |
1170 | * value indicates an error that can't be handled. | |
1171 | */ | |
1172 | static int check_index_status(struct relay_viewer_stream *vstream, | |
1173 | struct relay_stream *rstream, struct ctf_trace *trace, | |
1174 | struct lttng_viewer_index *index) | |
1175 | { | |
1176 | int ret; | |
1177 | ||
1178 | assert(vstream); | |
1179 | assert(rstream); | |
1180 | assert(index); | |
1181 | assert(trace); | |
1182 | ||
1183 | if (!rstream->close_flag) { | |
1184 | /* Rotate on abort (overwrite). */ | |
1185 | if (vstream->abort_flag) { | |
1186 | DBG("Viewer stream %" PRIu64 " rotate because of overwrite", | |
1187 | vstream->stream_handle); | |
1188 | ret = viewer_stream_rotate(vstream, rstream); | |
1189 | if (ret < 0) { | |
1190 | goto error; | |
1191 | } else if (ret == 1) { | |
1192 | /* EOF */ | |
1193 | index->status = htobe32(LTTNG_VIEWER_INDEX_HUP); | |
1194 | goto hup; | |
1195 | } | |
1196 | /* ret == 0 means successful so we continue. */ | |
1197 | } | |
1198 | ||
1199 | /* Check if we are in the same trace file at this point. */ | |
1200 | if (rstream->tracefile_count_current == vstream->tracefile_count_current) { | |
1201 | if (rstream->beacon_ts_end != -1ULL && | |
1202 | vstream->last_sent_index == rstream->total_index_received) { | |
1203 | /* | |
1204 | * We've received a synchronization beacon and the last index | |
1205 | * available has been sent, the index for now is inactive. | |
1206 | */ | |
1207 | index->status = htobe32(LTTNG_VIEWER_INDEX_INACTIVE); | |
1208 | index->timestamp_end = htobe64(rstream->beacon_ts_end); | |
1209 | goto index_ready; | |
ca3aecdf | 1210 | } else if (rstream->total_index_received <= vstream->last_sent_index |
878c34cf DG |
1211 | && !vstream->close_write_flag) { |
1212 | /* | |
1213 | * Reader and writer are working in the same tracefile, so we care | |
1214 | * about the number of index received and sent. Otherwise, we read | |
1215 | * up to EOF. | |
1216 | */ | |
1217 | index->status = htobe32(LTTNG_VIEWER_INDEX_RETRY); | |
1218 | goto index_ready; | |
1219 | } | |
1220 | } | |
1221 | /* Nothing to do with the index, continue with it. */ | |
1222 | ret = 0; | |
1223 | } else if (rstream->close_flag && vstream->close_write_flag && | |
1224 | vstream->total_index_received == vstream->last_sent_index) { | |
1225 | /* Last index sent and current tracefile closed in write */ | |
1226 | index->status = htobe32(LTTNG_VIEWER_INDEX_HUP); | |
1227 | goto hup; | |
1228 | } else { | |
1229 | vstream->close_write_flag = 1; | |
1230 | ret = 0; | |
1231 | } | |
1232 | ||
1233 | error: | |
1234 | return ret; | |
1235 | ||
1236 | hup: | |
1237 | viewer_stream_delete(vstream); | |
1238 | viewer_stream_destroy(trace, vstream); | |
1239 | index_ready: | |
1240 | return 1; | |
1241 | } | |
1242 | ||
d3e2ba59 JD |
1243 | /* |
1244 | * Send the next index for a stream. | |
1245 | * | |
1246 | * Return 0 on success or else a negative value. | |
1247 | */ | |
1248 | static | |
58eb9381 | 1249 | int viewer_get_next_index(struct relay_connection *conn) |
d3e2ba59 JD |
1250 | { |
1251 | int ret; | |
878c34cf | 1252 | ssize_t read_ret; |
d3e2ba59 JD |
1253 | struct lttng_viewer_get_next_index request_index; |
1254 | struct lttng_viewer_index viewer_index; | |
50adc264 | 1255 | struct ctf_packet_index packet_index; |
d3e2ba59 JD |
1256 | struct relay_viewer_stream *vstream; |
1257 | struct relay_stream *rstream; | |
2a174661 DG |
1258 | struct ctf_trace *ctf_trace; |
1259 | struct relay_session *session; | |
d3e2ba59 | 1260 | |
58eb9381 | 1261 | assert(conn); |
d3e2ba59 JD |
1262 | |
1263 | DBG("Viewer get next index"); | |
1264 | ||
eea7556c | 1265 | health_code_update(); |
2f8f53af | 1266 | |
58eb9381 | 1267 | ret = recv_request(conn->sock, &request_index, sizeof(request_index)); |
2f8f53af | 1268 | if (ret < 0) { |
d3e2ba59 JD |
1269 | goto end; |
1270 | } | |
eea7556c | 1271 | health_code_update(); |
d3e2ba59 JD |
1272 | |
1273 | rcu_read_lock(); | |
6763619c JD |
1274 | vstream = viewer_stream_find_by_id(be64toh(request_index.stream_id)); |
1275 | if (!vstream) { | |
2a174661 DG |
1276 | ret = -1; |
1277 | goto end_unlock; | |
1278 | } | |
1279 | ||
6763619c JD |
1280 | session = session_find_by_id(conn->sessions_ht, vstream->session_id); |
1281 | if (!session) { | |
d3e2ba59 JD |
1282 | ret = -1; |
1283 | goto end_unlock; | |
1284 | } | |
1285 | ||
2a174661 DG |
1286 | ctf_trace = ctf_trace_find_by_path(session->ctf_traces_ht, vstream->path_name); |
1287 | assert(ctf_trace); | |
1288 | ||
d3e2ba59 JD |
1289 | memset(&viewer_index, 0, sizeof(viewer_index)); |
1290 | ||
1291 | /* | |
1292 | * The viewer should not ask for index on metadata stream. | |
1293 | */ | |
1294 | if (vstream->metadata_flag) { | |
c4e361a4 | 1295 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_HUP); |
d3e2ba59 JD |
1296 | goto send_reply; |
1297 | } | |
1298 | ||
878c34cf DG |
1299 | rstream = stream_find_by_id(relay_streams_ht, vstream->stream_handle); |
1300 | assert(rstream); | |
1301 | ||
1302 | /* Try to open an index if one is needed for that stream. */ | |
1303 | ret = try_open_index(vstream, rstream); | |
1304 | if (ret < 0) { | |
0e6830aa | 1305 | if (ret == -ENOENT) { |
d3e2ba59 JD |
1306 | /* |
1307 | * The index is created only when the first data packet arrives, it | |
1308 | * might not be ready at the beginning of the session | |
1309 | */ | |
c4e361a4 | 1310 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_RETRY); |
878c34cf DG |
1311 | } else { |
1312 | /* Unhandled error. */ | |
c4e361a4 | 1313 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR); |
d3e2ba59 | 1314 | } |
878c34cf | 1315 | goto send_reply; |
d3e2ba59 JD |
1316 | } |
1317 | ||
10b0cd2e | 1318 | pthread_mutex_lock(&rstream->viewer_stream_rotation_lock); |
878c34cf DG |
1319 | ret = check_index_status(vstream, rstream, ctf_trace, &viewer_index); |
1320 | pthread_mutex_unlock(&rstream->viewer_stream_rotation_lock); | |
1321 | if (ret < 0) { | |
1322 | goto end; | |
1323 | } else if (ret == 1) { | |
1324 | /* | |
1325 | * This means the viewer index data structure has been populated by the | |
1326 | * check call thus we now send back the reply to the client. | |
1327 | */ | |
d3e2ba59 JD |
1328 | goto send_reply; |
1329 | } | |
878c34cf DG |
1330 | /* At this point, ret MUST be 0 thus we continue with the get. */ |
1331 | assert(!ret); | |
d3e2ba59 | 1332 | |
2a174661 DG |
1333 | if (!ctf_trace->metadata_received || |
1334 | ctf_trace->metadata_received > ctf_trace->metadata_sent) { | |
d3e2ba59 JD |
1335 | viewer_index.flags |= LTTNG_VIEWER_FLAG_NEW_METADATA; |
1336 | } | |
1337 | ||
f04a971b | 1338 | ret = check_new_streams(conn); |
4a9daf17 JD |
1339 | if (ret < 0) { |
1340 | goto end_unlock; | |
1341 | } else if (ret == 1) { | |
1342 | viewer_index.flags |= LTTNG_VIEWER_FLAG_NEW_STREAM; | |
1343 | } | |
1344 | ||
56611b06 | 1345 | pthread_mutex_lock(&rstream->viewer_stream_rotation_lock); |
cef0f7d5 JD |
1346 | pthread_mutex_lock(&vstream->overwrite_lock); |
1347 | if (vstream->abort_flag) { | |
878c34cf | 1348 | /* The file is being overwritten by the writer, we cannot use it. */ |
cef0f7d5 | 1349 | pthread_mutex_unlock(&vstream->overwrite_lock); |
2f8f53af | 1350 | ret = viewer_stream_rotate(vstream, rstream); |
56611b06 | 1351 | pthread_mutex_unlock(&rstream->viewer_stream_rotation_lock); |
cef0f7d5 JD |
1352 | if (ret < 0) { |
1353 | goto end_unlock; | |
a020f610 | 1354 | } else if (ret == 1) { |
c4e361a4 | 1355 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_HUP); |
2f8f53af | 1356 | viewer_stream_delete(vstream); |
2a174661 | 1357 | viewer_stream_destroy(ctf_trace, vstream); |
878c34cf DG |
1358 | } else { |
1359 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_RETRY); | |
cef0f7d5 JD |
1360 | } |
1361 | goto send_reply; | |
1362 | } | |
2f8f53af | 1363 | |
878c34cf | 1364 | read_ret = lttng_read(vstream->index_read_fd, &packet_index, |
6cd525e8 | 1365 | sizeof(packet_index)); |
cef0f7d5 | 1366 | pthread_mutex_unlock(&vstream->overwrite_lock); |
56611b06 | 1367 | pthread_mutex_unlock(&rstream->viewer_stream_rotation_lock); |
878c34cf DG |
1368 | if (read_ret < 0) { |
1369 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_HUP); | |
1370 | viewer_stream_delete(vstream); | |
1371 | viewer_stream_destroy(ctf_trace, vstream); | |
1372 | goto send_reply; | |
1373 | } else if (read_ret < sizeof(packet_index)) { | |
10b0cd2e | 1374 | pthread_mutex_lock(&rstream->viewer_stream_rotation_lock); |
878c34cf | 1375 | if (vstream->close_write_flag) { |
2f8f53af | 1376 | ret = viewer_stream_rotate(vstream, rstream); |
6b6b9a5a | 1377 | if (ret < 0) { |
878c34cf | 1378 | pthread_mutex_unlock(&rstream->viewer_stream_rotation_lock); |
6b6b9a5a | 1379 | goto end_unlock; |
a020f610 | 1380 | } else if (ret == 1) { |
c4e361a4 | 1381 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_HUP); |
2f8f53af | 1382 | viewer_stream_delete(vstream); |
2a174661 | 1383 | viewer_stream_destroy(ctf_trace, vstream); |
878c34cf DG |
1384 | } else { |
1385 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_RETRY); | |
6b6b9a5a JD |
1386 | } |
1387 | } else { | |
878c34cf | 1388 | ERR("Relay reading index file %d", vstream->index_read_fd); |
c4e361a4 | 1389 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR); |
6b6b9a5a | 1390 | } |
878c34cf | 1391 | pthread_mutex_unlock(&rstream->viewer_stream_rotation_lock); |
6b6b9a5a | 1392 | goto send_reply; |
d3e2ba59 | 1393 | } else { |
c4e361a4 | 1394 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_OK); |
d3e2ba59 JD |
1395 | vstream->last_sent_index++; |
1396 | } | |
1397 | ||
1398 | /* | |
1399 | * Indexes are stored in big endian, no need to switch before sending. | |
1400 | */ | |
1401 | viewer_index.offset = packet_index.offset; | |
1402 | viewer_index.packet_size = packet_index.packet_size; | |
1403 | viewer_index.content_size = packet_index.content_size; | |
1404 | viewer_index.timestamp_begin = packet_index.timestamp_begin; | |
1405 | viewer_index.timestamp_end = packet_index.timestamp_end; | |
1406 | viewer_index.events_discarded = packet_index.events_discarded; | |
1407 | viewer_index.stream_id = packet_index.stream_id; | |
1408 | ||
1409 | send_reply: | |
1410 | viewer_index.flags = htobe32(viewer_index.flags); | |
eea7556c | 1411 | health_code_update(); |
2f8f53af | 1412 | |
58eb9381 | 1413 | ret = send_response(conn->sock, &viewer_index, sizeof(viewer_index)); |
d3e2ba59 | 1414 | if (ret < 0) { |
d3e2ba59 JD |
1415 | goto end_unlock; |
1416 | } | |
eea7556c | 1417 | health_code_update(); |
d3e2ba59 | 1418 | |
2f8f53af | 1419 | DBG("Index %" PRIu64 " for stream %" PRIu64 " sent", |
d3e2ba59 JD |
1420 | vstream->last_sent_index, vstream->stream_handle); |
1421 | ||
1422 | end_unlock: | |
1423 | rcu_read_unlock(); | |
1424 | ||
d3e2ba59 JD |
1425 | end: |
1426 | return ret; | |
1427 | } | |
1428 | ||
1429 | /* | |
1430 | * Send the next index for a stream | |
1431 | * | |
1432 | * Return 0 on success or else a negative value. | |
1433 | */ | |
1434 | static | |
58eb9381 | 1435 | int viewer_get_packet(struct relay_connection *conn) |
d3e2ba59 JD |
1436 | { |
1437 | int ret, send_data = 0; | |
1438 | char *data = NULL; | |
1439 | uint32_t len = 0; | |
1440 | ssize_t read_len; | |
1441 | struct lttng_viewer_get_packet get_packet_info; | |
1442 | struct lttng_viewer_trace_packet reply; | |
1443 | struct relay_viewer_stream *stream; | |
6763619c | 1444 | struct relay_session *session; |
2a174661 | 1445 | struct ctf_trace *ctf_trace; |
d3e2ba59 | 1446 | |
58eb9381 | 1447 | assert(conn); |
d3e2ba59 JD |
1448 | |
1449 | DBG2("Relay get data packet"); | |
1450 | ||
eea7556c | 1451 | health_code_update(); |
2f8f53af | 1452 | |
58eb9381 | 1453 | ret = recv_request(conn->sock, &get_packet_info, sizeof(get_packet_info)); |
2f8f53af | 1454 | if (ret < 0) { |
d3e2ba59 JD |
1455 | goto end; |
1456 | } | |
eea7556c | 1457 | health_code_update(); |
d3e2ba59 | 1458 | |
0233a6a5 DG |
1459 | /* From this point on, the error label can be reached. */ |
1460 | memset(&reply, 0, sizeof(reply)); | |
1461 | ||
d3e2ba59 | 1462 | rcu_read_lock(); |
2f8f53af | 1463 | stream = viewer_stream_find_by_id(be64toh(get_packet_info.stream_id)); |
d3e2ba59 JD |
1464 | if (!stream) { |
1465 | goto error; | |
1466 | } | |
2a174661 | 1467 | |
6763619c JD |
1468 | session = session_find_by_id(conn->sessions_ht, stream->session_id); |
1469 | if (!session) { | |
1470 | ret = -1; | |
1471 | goto error; | |
1472 | } | |
1473 | ||
1474 | ctf_trace = ctf_trace_find_by_path(session->ctf_traces_ht, | |
2a174661 DG |
1475 | stream->path_name); |
1476 | assert(ctf_trace); | |
d3e2ba59 JD |
1477 | |
1478 | /* | |
1479 | * First time we read this stream, we need open the tracefile, we should | |
1480 | * only arrive here if an index has already been sent to the viewer, so the | |
1481 | * tracefile must exist, if it does not it is a fatal error. | |
1482 | */ | |
1483 | if (stream->read_fd < 0) { | |
1484 | char fullpath[PATH_MAX]; | |
1485 | ||
6b6b9a5a JD |
1486 | if (stream->tracefile_count > 0) { |
1487 | ret = snprintf(fullpath, PATH_MAX, "%s/%s_%" PRIu64, stream->path_name, | |
1488 | stream->channel_name, | |
1489 | stream->tracefile_count_current); | |
1490 | } else { | |
1491 | ret = snprintf(fullpath, PATH_MAX, "%s/%s", stream->path_name, | |
1492 | stream->channel_name); | |
1493 | } | |
d3e2ba59 JD |
1494 | if (ret < 0) { |
1495 | goto error; | |
1496 | } | |
1497 | ret = open(fullpath, O_RDONLY); | |
1498 | if (ret < 0) { | |
1499 | PERROR("Relay opening trace file"); | |
1500 | goto error; | |
1501 | } | |
1502 | stream->read_fd = ret; | |
1503 | } | |
1504 | ||
2a174661 DG |
1505 | if (!ctf_trace->metadata_received || |
1506 | ctf_trace->metadata_received > ctf_trace->metadata_sent) { | |
c4e361a4 | 1507 | reply.status = htobe32(LTTNG_VIEWER_GET_PACKET_ERR); |
d3e2ba59 | 1508 | reply.flags |= LTTNG_VIEWER_FLAG_NEW_METADATA; |
d3e2ba59 JD |
1509 | goto send_reply; |
1510 | } | |
1511 | ||
f04a971b | 1512 | ret = check_new_streams(conn); |
4a9daf17 JD |
1513 | if (ret < 0) { |
1514 | goto end_unlock; | |
1515 | } else if (ret == 1) { | |
c4e361a4 | 1516 | reply.status = htobe32(LTTNG_VIEWER_GET_PACKET_ERR); |
4a9daf17 JD |
1517 | reply.flags |= LTTNG_VIEWER_FLAG_NEW_STREAM; |
1518 | goto send_reply; | |
1519 | } | |
1520 | ||
d3e2ba59 JD |
1521 | len = be32toh(get_packet_info.len); |
1522 | data = zmalloc(len); | |
1523 | if (!data) { | |
1524 | PERROR("relay data zmalloc"); | |
1525 | goto error; | |
1526 | } | |
1527 | ||
1528 | ret = lseek(stream->read_fd, be64toh(get_packet_info.offset), SEEK_SET); | |
1529 | if (ret < 0) { | |
6b6b9a5a JD |
1530 | /* |
1531 | * If the read fd was closed by the streaming side, the | |
1532 | * abort_flag will be set to 1, otherwise it is an error. | |
1533 | */ | |
1534 | if (stream->abort_flag == 0) { | |
1535 | PERROR("lseek"); | |
1536 | goto error; | |
1537 | } | |
c4e361a4 | 1538 | reply.status = htobe32(LTTNG_VIEWER_GET_PACKET_EOF); |
6b6b9a5a | 1539 | goto send_reply; |
d3e2ba59 | 1540 | } |
6cd525e8 MD |
1541 | read_len = lttng_read(stream->read_fd, data, len); |
1542 | if (read_len < len) { | |
6b6b9a5a JD |
1543 | /* |
1544 | * If the read fd was closed by the streaming side, the | |
1545 | * abort_flag will be set to 1, otherwise it is an error. | |
1546 | */ | |
1547 | if (stream->abort_flag == 0) { | |
1548 | PERROR("Relay reading trace file, fd: %d, offset: %" PRIu64, | |
1549 | stream->read_fd, | |
1550 | be64toh(get_packet_info.offset)); | |
1551 | goto error; | |
1552 | } else { | |
c4e361a4 | 1553 | reply.status = htobe32(LTTNG_VIEWER_GET_PACKET_EOF); |
6b6b9a5a JD |
1554 | goto send_reply; |
1555 | } | |
d3e2ba59 | 1556 | } |
c4e361a4 | 1557 | reply.status = htobe32(LTTNG_VIEWER_GET_PACKET_OK); |
d3e2ba59 JD |
1558 | reply.len = htobe32(len); |
1559 | send_data = 1; | |
1560 | goto send_reply; | |
1561 | ||
1562 | error: | |
c4e361a4 | 1563 | reply.status = htobe32(LTTNG_VIEWER_GET_PACKET_ERR); |
d3e2ba59 JD |
1564 | |
1565 | send_reply: | |
1566 | reply.flags = htobe32(reply.flags); | |
eea7556c MD |
1567 | |
1568 | health_code_update(); | |
2f8f53af | 1569 | |
58eb9381 | 1570 | ret = send_response(conn->sock, &reply, sizeof(reply)); |
d3e2ba59 | 1571 | if (ret < 0) { |
d3e2ba59 JD |
1572 | goto end_unlock; |
1573 | } | |
eea7556c | 1574 | health_code_update(); |
d3e2ba59 JD |
1575 | |
1576 | if (send_data) { | |
eea7556c | 1577 | health_code_update(); |
58eb9381 | 1578 | ret = send_response(conn->sock, data, len); |
d3e2ba59 | 1579 | if (ret < 0) { |
d3e2ba59 JD |
1580 | goto end_unlock; |
1581 | } | |
eea7556c | 1582 | health_code_update(); |
d3e2ba59 JD |
1583 | } |
1584 | ||
1585 | DBG("Sent %u bytes for stream %" PRIu64, len, | |
1586 | be64toh(get_packet_info.stream_id)); | |
1587 | ||
1588 | end_unlock: | |
1589 | free(data); | |
1590 | rcu_read_unlock(); | |
1591 | ||
1592 | end: | |
1593 | return ret; | |
1594 | } | |
1595 | ||
1596 | /* | |
1597 | * Send the session's metadata | |
1598 | * | |
1599 | * Return 0 on success else a negative value. | |
1600 | */ | |
1601 | static | |
58eb9381 | 1602 | int viewer_get_metadata(struct relay_connection *conn) |
d3e2ba59 JD |
1603 | { |
1604 | int ret = 0; | |
1605 | ssize_t read_len; | |
1606 | uint64_t len = 0; | |
1607 | char *data = NULL; | |
1608 | struct lttng_viewer_get_metadata request; | |
1609 | struct lttng_viewer_metadata_packet reply; | |
1610 | struct relay_viewer_stream *stream; | |
2a174661 | 1611 | struct ctf_trace *ctf_trace; |
6763619c | 1612 | struct relay_session *session; |
d3e2ba59 | 1613 | |
58eb9381 | 1614 | assert(conn); |
d3e2ba59 JD |
1615 | |
1616 | DBG("Relay get metadata"); | |
1617 | ||
eea7556c | 1618 | health_code_update(); |
2f8f53af | 1619 | |
58eb9381 | 1620 | ret = recv_request(conn->sock, &request, sizeof(request)); |
2f8f53af | 1621 | if (ret < 0) { |
d3e2ba59 JD |
1622 | goto end; |
1623 | } | |
eea7556c | 1624 | health_code_update(); |
d3e2ba59 | 1625 | |
53efb85a MD |
1626 | memset(&reply, 0, sizeof(reply)); |
1627 | ||
d3e2ba59 | 1628 | rcu_read_lock(); |
2f8f53af | 1629 | stream = viewer_stream_find_by_id(be64toh(request.stream_id)); |
d3e2ba59 JD |
1630 | if (!stream || !stream->metadata_flag) { |
1631 | ERR("Invalid metadata stream"); | |
1632 | goto error; | |
1633 | } | |
d3e2ba59 | 1634 | |
6763619c JD |
1635 | session = session_find_by_id(conn->sessions_ht, stream->session_id); |
1636 | if (!session) { | |
1637 | ret = -1; | |
1638 | goto error; | |
1639 | } | |
1640 | ||
1641 | ctf_trace = ctf_trace_find_by_path(session->ctf_traces_ht, | |
2a174661 DG |
1642 | stream->path_name); |
1643 | assert(ctf_trace); | |
1644 | assert(ctf_trace->metadata_sent <= ctf_trace->metadata_received); | |
1645 | ||
1646 | len = ctf_trace->metadata_received - ctf_trace->metadata_sent; | |
d3e2ba59 | 1647 | if (len == 0) { |
c4e361a4 | 1648 | reply.status = htobe32(LTTNG_VIEWER_NO_NEW_METADATA); |
d3e2ba59 JD |
1649 | goto send_reply; |
1650 | } | |
1651 | ||
1652 | /* first time, we open the metadata file */ | |
1653 | if (stream->read_fd < 0) { | |
1654 | char fullpath[PATH_MAX]; | |
1655 | ||
1656 | ret = snprintf(fullpath, PATH_MAX, "%s/%s", stream->path_name, | |
1657 | stream->channel_name); | |
1658 | if (ret < 0) { | |
1659 | goto error; | |
1660 | } | |
1661 | ret = open(fullpath, O_RDONLY); | |
1662 | if (ret < 0) { | |
1663 | PERROR("Relay opening metadata file"); | |
1664 | goto error; | |
1665 | } | |
1666 | stream->read_fd = ret; | |
1667 | } | |
1668 | ||
1669 | reply.len = htobe64(len); | |
1670 | data = zmalloc(len); | |
1671 | if (!data) { | |
1672 | PERROR("viewer metadata zmalloc"); | |
1673 | goto error; | |
1674 | } | |
1675 | ||
6cd525e8 MD |
1676 | read_len = lttng_read(stream->read_fd, data, len); |
1677 | if (read_len < len) { | |
d3e2ba59 JD |
1678 | PERROR("Relay reading metadata file"); |
1679 | goto error; | |
1680 | } | |
2a174661 | 1681 | ctf_trace->metadata_sent += read_len; |
c4e361a4 | 1682 | reply.status = htobe32(LTTNG_VIEWER_METADATA_OK); |
d3e2ba59 JD |
1683 | goto send_reply; |
1684 | ||
1685 | error: | |
c4e361a4 | 1686 | reply.status = htobe32(LTTNG_VIEWER_METADATA_ERR); |
d3e2ba59 JD |
1687 | |
1688 | send_reply: | |
eea7556c | 1689 | health_code_update(); |
58eb9381 | 1690 | ret = send_response(conn->sock, &reply, sizeof(reply)); |
d3e2ba59 | 1691 | if (ret < 0) { |
d3e2ba59 JD |
1692 | goto end_unlock; |
1693 | } | |
eea7556c | 1694 | health_code_update(); |
d3e2ba59 JD |
1695 | |
1696 | if (len > 0) { | |
58eb9381 | 1697 | ret = send_response(conn->sock, data, len); |
d3e2ba59 | 1698 | if (ret < 0) { |
d3e2ba59 JD |
1699 | goto end_unlock; |
1700 | } | |
1701 | } | |
1702 | ||
1703 | DBG("Sent %" PRIu64 " bytes of metadata for stream %" PRIu64, len, | |
1704 | be64toh(request.stream_id)); | |
1705 | ||
1706 | DBG("Metadata sent"); | |
1707 | ||
1708 | end_unlock: | |
1709 | free(data); | |
1710 | rcu_read_unlock(); | |
1711 | end: | |
1712 | return ret; | |
1713 | } | |
1714 | ||
c3b7390b JD |
1715 | /* |
1716 | * Create a viewer session. | |
1717 | * | |
1718 | * Return 0 on success or else a negative value. | |
1719 | */ | |
1720 | static | |
1721 | int viewer_create_session(struct relay_connection *conn) | |
1722 | { | |
1723 | int ret; | |
1724 | struct lttng_viewer_create_session_response resp; | |
1725 | ||
1726 | DBG("Viewer create session received"); | |
1727 | ||
53efb85a | 1728 | memset(&resp, 0, sizeof(resp)); |
c3b7390b | 1729 | resp.status = htobe32(LTTNG_VIEWER_CREATE_SESSION_OK); |
32816a93 | 1730 | conn->viewer_session = zmalloc(sizeof(*conn->viewer_session)); |
c3b7390b JD |
1731 | if (!conn->viewer_session) { |
1732 | ERR("Allocation viewer session"); | |
1733 | resp.status = htobe32(LTTNG_VIEWER_CREATE_SESSION_ERR); | |
1734 | goto send_reply; | |
1735 | } | |
1736 | CDS_INIT_LIST_HEAD(&conn->viewer_session->sessions_head); | |
1737 | ||
1738 | send_reply: | |
1739 | health_code_update(); | |
1740 | ret = send_response(conn->sock, &resp, sizeof(resp)); | |
1741 | if (ret < 0) { | |
1742 | goto end; | |
1743 | } | |
1744 | health_code_update(); | |
1745 | ret = 0; | |
1746 | ||
1747 | end: | |
1748 | return ret; | |
1749 | } | |
1750 | ||
1751 | ||
d3e2ba59 JD |
1752 | /* |
1753 | * live_relay_unknown_command: send -1 if received unknown command | |
1754 | */ | |
1755 | static | |
58eb9381 | 1756 | void live_relay_unknown_command(struct relay_connection *conn) |
d3e2ba59 JD |
1757 | { |
1758 | struct lttcomm_relayd_generic_reply reply; | |
d3e2ba59 | 1759 | |
53efb85a | 1760 | memset(&reply, 0, sizeof(reply)); |
d3e2ba59 | 1761 | reply.ret_code = htobe32(LTTNG_ERR_UNK); |
58eb9381 | 1762 | (void) send_response(conn->sock, &reply, sizeof(reply)); |
d3e2ba59 JD |
1763 | } |
1764 | ||
1765 | /* | |
1766 | * Process the commands received on the control socket | |
1767 | */ | |
1768 | static | |
1769 | int process_control(struct lttng_viewer_cmd *recv_hdr, | |
58eb9381 | 1770 | struct relay_connection *conn) |
d3e2ba59 JD |
1771 | { |
1772 | int ret = 0; | |
2f8f53af DG |
1773 | uint32_t msg_value; |
1774 | ||
1775 | assert(recv_hdr); | |
58eb9381 | 1776 | assert(conn); |
2f8f53af DG |
1777 | |
1778 | msg_value = be32toh(recv_hdr->cmd); | |
1779 | ||
1780 | /* | |
1781 | * Make sure we've done the version check before any command other then a | |
1782 | * new client connection. | |
1783 | */ | |
c4e361a4 | 1784 | if (msg_value != LTTNG_VIEWER_CONNECT && !conn->version_check_done) { |
58eb9381 | 1785 | ERR("Viewer conn value %" PRIu32 " before version check", msg_value); |
2f8f53af DG |
1786 | ret = -1; |
1787 | goto end; | |
1788 | } | |
d3e2ba59 | 1789 | |
2f8f53af | 1790 | switch (msg_value) { |
c4e361a4 | 1791 | case LTTNG_VIEWER_CONNECT: |
58eb9381 | 1792 | ret = viewer_connect(conn); |
d3e2ba59 | 1793 | break; |
c4e361a4 | 1794 | case LTTNG_VIEWER_LIST_SESSIONS: |
58eb9381 | 1795 | ret = viewer_list_sessions(conn); |
d3e2ba59 | 1796 | break; |
c4e361a4 | 1797 | case LTTNG_VIEWER_ATTACH_SESSION: |
58eb9381 | 1798 | ret = viewer_attach_session(conn); |
d3e2ba59 | 1799 | break; |
c4e361a4 | 1800 | case LTTNG_VIEWER_GET_NEXT_INDEX: |
58eb9381 | 1801 | ret = viewer_get_next_index(conn); |
d3e2ba59 | 1802 | break; |
c4e361a4 | 1803 | case LTTNG_VIEWER_GET_PACKET: |
58eb9381 | 1804 | ret = viewer_get_packet(conn); |
d3e2ba59 | 1805 | break; |
c4e361a4 | 1806 | case LTTNG_VIEWER_GET_METADATA: |
58eb9381 | 1807 | ret = viewer_get_metadata(conn); |
d3e2ba59 | 1808 | break; |
c4e361a4 | 1809 | case LTTNG_VIEWER_GET_NEW_STREAMS: |
58eb9381 | 1810 | ret = viewer_get_new_streams(conn); |
80e8027a | 1811 | break; |
c3b7390b JD |
1812 | case LTTNG_VIEWER_CREATE_SESSION: |
1813 | ret = viewer_create_session(conn); | |
1814 | break; | |
d3e2ba59 JD |
1815 | default: |
1816 | ERR("Received unknown viewer command (%u)", be32toh(recv_hdr->cmd)); | |
58eb9381 | 1817 | live_relay_unknown_command(conn); |
d3e2ba59 JD |
1818 | ret = -1; |
1819 | goto end; | |
1820 | } | |
1821 | ||
1822 | end: | |
1823 | return ret; | |
1824 | } | |
1825 | ||
1826 | static | |
58eb9381 | 1827 | void cleanup_connection_pollfd(struct lttng_poll_event *events, int pollfd) |
d3e2ba59 JD |
1828 | { |
1829 | int ret; | |
1830 | ||
1831 | assert(events); | |
1832 | ||
58eb9381 | 1833 | (void) lttng_poll_del(events, pollfd); |
d3e2ba59 JD |
1834 | |
1835 | ret = close(pollfd); | |
1836 | if (ret < 0) { | |
1837 | ERR("Closing pollfd %d", pollfd); | |
1838 | } | |
1839 | } | |
1840 | ||
d3e2ba59 | 1841 | /* |
58eb9381 | 1842 | * Delete and destroy a connection. |
d3e2ba59 JD |
1843 | * |
1844 | * RCU read side lock MUST be acquired. | |
1845 | */ | |
58eb9381 DG |
1846 | static void destroy_connection(struct lttng_ht *relay_connections_ht, |
1847 | struct relay_connection *conn) | |
d3e2ba59 | 1848 | { |
6763619c | 1849 | struct relay_session *session, *tmp_session; |
d3e2ba59 JD |
1850 | |
1851 | assert(relay_connections_ht); | |
58eb9381 | 1852 | assert(conn); |
d3e2ba59 | 1853 | |
58eb9381 | 1854 | connection_delete(relay_connections_ht, conn); |
d3e2ba59 | 1855 | |
6763619c JD |
1856 | if (!conn->viewer_session) { |
1857 | goto end; | |
1858 | } | |
1859 | ||
58eb9381 | 1860 | rcu_read_lock(); |
6763619c JD |
1861 | cds_list_for_each_entry_safe(session, tmp_session, |
1862 | &conn->viewer_session->sessions_head, | |
1863 | viewer_session_list) { | |
1864 | DBG("Cleaning connection of session ID %" PRIu64, session->id); | |
d227d5bd | 1865 | cleanup_session(conn, session); |
2a174661 DG |
1866 | } |
1867 | rcu_read_unlock(); | |
d3e2ba59 | 1868 | |
6763619c | 1869 | end: |
58eb9381 | 1870 | connection_destroy(conn); |
d3e2ba59 JD |
1871 | } |
1872 | ||
1873 | /* | |
1874 | * This thread does the actual work | |
1875 | */ | |
1876 | static | |
1877 | void *thread_worker(void *data) | |
1878 | { | |
1879 | int ret, err = -1; | |
1880 | uint32_t nb_fd; | |
58eb9381 | 1881 | struct relay_connection *conn; |
d3e2ba59 JD |
1882 | struct lttng_poll_event events; |
1883 | struct lttng_ht *relay_connections_ht; | |
d3e2ba59 JD |
1884 | struct lttng_ht_iter iter; |
1885 | struct lttng_viewer_cmd recv_hdr; | |
1886 | struct relay_local_data *relay_ctx = (struct relay_local_data *) data; | |
1887 | struct lttng_ht *sessions_ht = relay_ctx->sessions_ht; | |
d3e2ba59 JD |
1888 | |
1889 | DBG("[thread] Live viewer relay worker started"); | |
1890 | ||
1891 | rcu_register_thread(); | |
1892 | ||
eea7556c MD |
1893 | health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_WORKER); |
1894 | ||
9b5e0863 MD |
1895 | if (testpoint(relayd_thread_live_worker)) { |
1896 | goto error_testpoint; | |
1897 | } | |
1898 | ||
d3e2ba59 JD |
1899 | /* table of connections indexed on socket */ |
1900 | relay_connections_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); | |
1901 | if (!relay_connections_ht) { | |
1902 | goto relay_connections_ht_error; | |
1903 | } | |
1904 | ||
1905 | ret = create_thread_poll_set(&events, 2); | |
1906 | if (ret < 0) { | |
1907 | goto error_poll_create; | |
1908 | } | |
1909 | ||
58eb9381 | 1910 | ret = lttng_poll_add(&events, live_conn_pipe[0], LPOLLIN | LPOLLRDHUP); |
d3e2ba59 JD |
1911 | if (ret < 0) { |
1912 | goto error; | |
1913 | } | |
1914 | ||
1915 | restart: | |
1916 | while (1) { | |
1917 | int i; | |
1918 | ||
eea7556c MD |
1919 | health_code_update(); |
1920 | ||
d3e2ba59 JD |
1921 | /* Infinite blocking call, waiting for transmission */ |
1922 | DBG3("Relayd live viewer worker thread polling..."); | |
eea7556c | 1923 | health_poll_entry(); |
d3e2ba59 | 1924 | ret = lttng_poll_wait(&events, -1); |
eea7556c | 1925 | health_poll_exit(); |
d3e2ba59 JD |
1926 | if (ret < 0) { |
1927 | /* | |
1928 | * Restart interrupted system call. | |
1929 | */ | |
1930 | if (errno == EINTR) { | |
1931 | goto restart; | |
1932 | } | |
1933 | goto error; | |
1934 | } | |
1935 | ||
1936 | nb_fd = ret; | |
1937 | ||
1938 | /* | |
1939 | * Process control. The control connection is prioritised so we don't | |
1940 | * starve it with high throughput tracing data on the data | |
1941 | * connection. | |
1942 | */ | |
1943 | for (i = 0; i < nb_fd; i++) { | |
1944 | /* Fetch once the poll data */ | |
1945 | uint32_t revents = LTTNG_POLL_GETEV(&events, i); | |
1946 | int pollfd = LTTNG_POLL_GETFD(&events, i); | |
1947 | ||
eea7556c MD |
1948 | health_code_update(); |
1949 | ||
d3e2ba59 | 1950 | /* Thread quit pipe has been closed. Killing thread. */ |
bcf4a440 | 1951 | ret = check_thread_quit_pipe(pollfd, revents); |
d3e2ba59 JD |
1952 | if (ret) { |
1953 | err = 0; | |
1954 | goto exit; | |
1955 | } | |
1956 | ||
58eb9381 DG |
1957 | /* Inspect the relay conn pipe for new connection */ |
1958 | if (pollfd == live_conn_pipe[0]) { | |
d3e2ba59 JD |
1959 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
1960 | ERR("Relay live pipe error"); | |
1961 | goto error; | |
1962 | } else if (revents & LPOLLIN) { | |
58eb9381 | 1963 | ret = lttng_read(live_conn_pipe[0], &conn, sizeof(conn)); |
d3e2ba59 JD |
1964 | if (ret < 0) { |
1965 | goto error; | |
1966 | } | |
58eb9381 DG |
1967 | conn->sessions_ht = sessions_ht; |
1968 | connection_init(conn); | |
1969 | lttng_poll_add(&events, conn->sock->fd, | |
1970 | LPOLLIN | LPOLLRDHUP); | |
1971 | rcu_read_lock(); | |
1972 | lttng_ht_add_unique_ulong(relay_connections_ht, | |
1973 | &conn->sock_n); | |
d3e2ba59 | 1974 | rcu_read_unlock(); |
58eb9381 | 1975 | DBG("Connection socket %d added", conn->sock->fd); |
d3e2ba59 | 1976 | } |
58eb9381 DG |
1977 | } else { |
1978 | rcu_read_lock(); | |
1979 | conn = connection_find_by_sock(relay_connections_ht, pollfd); | |
1980 | /* If not found, there is a synchronization issue. */ | |
1981 | assert(conn); | |
1982 | ||
1983 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1984 | cleanup_connection_pollfd(&events, pollfd); | |
1985 | destroy_connection(relay_connections_ht, conn); | |
d3e2ba59 | 1986 | } else if (revents & LPOLLIN) { |
58eb9381 DG |
1987 | ret = conn->sock->ops->recvmsg(conn->sock, &recv_hdr, |
1988 | sizeof(recv_hdr), 0); | |
d3e2ba59 | 1989 | if (ret <= 0) { |
58eb9381 DG |
1990 | /* Connection closed */ |
1991 | cleanup_connection_pollfd(&events, pollfd); | |
1992 | destroy_connection(relay_connections_ht, conn); | |
1993 | DBG("Viewer control conn closed with %d", pollfd); | |
d3e2ba59 | 1994 | } else { |
58eb9381 | 1995 | ret = process_control(&recv_hdr, conn); |
d3e2ba59 JD |
1996 | if (ret < 0) { |
1997 | /* Clear the session on error. */ | |
58eb9381 DG |
1998 | cleanup_connection_pollfd(&events, pollfd); |
1999 | destroy_connection(relay_connections_ht, conn); | |
d3e2ba59 JD |
2000 | DBG("Viewer connection closed with %d", pollfd); |
2001 | } | |
2002 | } | |
2003 | } | |
2004 | rcu_read_unlock(); | |
2005 | } | |
2006 | } | |
2007 | } | |
2008 | ||
2009 | exit: | |
2010 | error: | |
2011 | lttng_poll_clean(&events); | |
2012 | ||
58eb9381 | 2013 | /* Cleanup reamaining connection object. */ |
d3e2ba59 | 2014 | rcu_read_lock(); |
58eb9381 DG |
2015 | cds_lfht_for_each_entry(relay_connections_ht->ht, &iter.iter, conn, |
2016 | sock_n.node) { | |
eea7556c | 2017 | health_code_update(); |
58eb9381 | 2018 | destroy_connection(relay_connections_ht, conn); |
d3e2ba59 JD |
2019 | } |
2020 | rcu_read_unlock(); | |
2021 | error_poll_create: | |
2022 | lttng_ht_destroy(relay_connections_ht); | |
2023 | relay_connections_ht_error: | |
58eb9381 DG |
2024 | /* Close relay conn pipes */ |
2025 | utils_close_pipe(live_conn_pipe); | |
d3e2ba59 JD |
2026 | if (err) { |
2027 | DBG("Viewer worker thread exited with error"); | |
2028 | } | |
2029 | DBG("Viewer worker thread cleanup complete"); | |
9b5e0863 | 2030 | error_testpoint: |
eea7556c MD |
2031 | if (err) { |
2032 | health_error(); | |
2033 | ERR("Health error occurred in %s", __func__); | |
2034 | } | |
2035 | health_unregister(health_relayd); | |
d3e2ba59 JD |
2036 | stop_threads(); |
2037 | rcu_unregister_thread(); | |
2038 | return NULL; | |
2039 | } | |
2040 | ||
2041 | /* | |
2042 | * Create the relay command pipe to wake thread_manage_apps. | |
2043 | * Closed in cleanup(). | |
2044 | */ | |
58eb9381 | 2045 | static int create_conn_pipe(void) |
d3e2ba59 JD |
2046 | { |
2047 | int ret; | |
2048 | ||
58eb9381 | 2049 | ret = utils_create_pipe_cloexec(live_conn_pipe); |
d3e2ba59 JD |
2050 | |
2051 | return ret; | |
2052 | } | |
2053 | ||
aaec7998 | 2054 | void live_stop_threads(void) |
d3e2ba59 JD |
2055 | { |
2056 | int ret; | |
2057 | void *status; | |
2058 | ||
2059 | stop_threads(); | |
2060 | ||
2061 | ret = pthread_join(live_listener_thread, &status); | |
2062 | if (ret != 0) { | |
2063 | PERROR("pthread_join live listener"); | |
2064 | goto error; /* join error, exit without cleanup */ | |
2065 | } | |
2066 | ||
2067 | ret = pthread_join(live_worker_thread, &status); | |
2068 | if (ret != 0) { | |
2069 | PERROR("pthread_join live worker"); | |
2070 | goto error; /* join error, exit without cleanup */ | |
2071 | } | |
2072 | ||
2073 | ret = pthread_join(live_dispatcher_thread, &status); | |
2074 | if (ret != 0) { | |
2075 | PERROR("pthread_join live dispatcher"); | |
2076 | goto error; /* join error, exit without cleanup */ | |
2077 | } | |
2078 | ||
2079 | cleanup(); | |
2080 | ||
2081 | error: | |
2082 | return; | |
2083 | } | |
2084 | ||
2085 | /* | |
2086 | * main | |
2087 | */ | |
2088 | int live_start_threads(struct lttng_uri *uri, | |
0b242f62 | 2089 | struct relay_local_data *relay_ctx) |
d3e2ba59 JD |
2090 | { |
2091 | int ret = 0; | |
2092 | void *status; | |
2093 | int is_root; | |
2094 | ||
2095 | assert(uri); | |
2096 | live_uri = uri; | |
2097 | ||
d3e2ba59 JD |
2098 | /* Check if daemon is UID = 0 */ |
2099 | is_root = !getuid(); | |
2100 | ||
2101 | if (!is_root) { | |
2102 | if (live_uri->port < 1024) { | |
2103 | ERR("Need to be root to use ports < 1024"); | |
2104 | ret = -1; | |
2105 | goto exit; | |
2106 | } | |
2107 | } | |
2108 | ||
2109 | /* Setup the thread apps communication pipe. */ | |
58eb9381 | 2110 | if ((ret = create_conn_pipe()) < 0) { |
d3e2ba59 JD |
2111 | goto exit; |
2112 | } | |
2113 | ||
2114 | /* Init relay command queue. */ | |
58eb9381 | 2115 | cds_wfq_init(&viewer_conn_queue.queue); |
d3e2ba59 JD |
2116 | |
2117 | /* Set up max poll set size */ | |
2118 | lttng_poll_set_max_size(); | |
2119 | ||
2120 | /* Setup the dispatcher thread */ | |
2121 | ret = pthread_create(&live_dispatcher_thread, NULL, | |
2122 | thread_dispatcher, (void *) NULL); | |
2123 | if (ret != 0) { | |
2124 | PERROR("pthread_create viewer dispatcher"); | |
2125 | goto exit_dispatcher; | |
2126 | } | |
2127 | ||
2128 | /* Setup the worker thread */ | |
2129 | ret = pthread_create(&live_worker_thread, NULL, | |
2130 | thread_worker, relay_ctx); | |
2131 | if (ret != 0) { | |
2132 | PERROR("pthread_create viewer worker"); | |
2133 | goto exit_worker; | |
2134 | } | |
2135 | ||
2136 | /* Setup the listener thread */ | |
2137 | ret = pthread_create(&live_listener_thread, NULL, | |
2138 | thread_listener, (void *) NULL); | |
2139 | if (ret != 0) { | |
2140 | PERROR("pthread_create viewer listener"); | |
2141 | goto exit_listener; | |
2142 | } | |
2143 | ||
2144 | ret = 0; | |
2145 | goto end; | |
2146 | ||
2147 | exit_listener: | |
2148 | ret = pthread_join(live_listener_thread, &status); | |
2149 | if (ret != 0) { | |
2150 | PERROR("pthread_join live listener"); | |
2151 | goto error; /* join error, exit without cleanup */ | |
2152 | } | |
2153 | ||
2154 | exit_worker: | |
2155 | ret = pthread_join(live_worker_thread, &status); | |
2156 | if (ret != 0) { | |
2157 | PERROR("pthread_join live worker"); | |
2158 | goto error; /* join error, exit without cleanup */ | |
2159 | } | |
2160 | ||
2161 | exit_dispatcher: | |
2162 | ret = pthread_join(live_dispatcher_thread, &status); | |
2163 | if (ret != 0) { | |
2164 | PERROR("pthread_join live dispatcher"); | |
2165 | goto error; /* join error, exit without cleanup */ | |
2166 | } | |
2167 | ||
2168 | exit: | |
2169 | cleanup(); | |
2170 | ||
2171 | end: | |
2172 | error: | |
2173 | return ret; | |
2174 | } |