Fix: relay: viewer_get_next_index handle null vstream
[lttng-tools.git] / src / bin / lttng-relayd / live.c
CommitLineData
d3e2ba59
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1/*
2 * Copyright (C) 2013 - Julien Desfossez <jdesfossez@efficios.com>
3 * David Goulet <dgoulet@efficios.com>
7591bab1 4 * 2015 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
d3e2ba59
JD
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License, version 2 only,
8 * as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * more details.
14 *
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
18 */
19
20#define _GNU_SOURCE
6c1c0768 21#define _LGPL_SOURCE
d3e2ba59
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22#include <getopt.h>
23#include <grp.h>
24#include <limits.h>
25#include <pthread.h>
26#include <signal.h>
27#include <stdio.h>
28#include <stdlib.h>
29#include <string.h>
30#include <sys/mman.h>
31#include <sys/mount.h>
32#include <sys/resource.h>
33#include <sys/socket.h>
34#include <sys/stat.h>
35#include <sys/types.h>
36#include <sys/wait.h>
37#include <inttypes.h>
38#include <urcu/futex.h>
39#include <urcu/uatomic.h>
7591bab1 40#include <urcu/rculist.h>
d3e2ba59
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41#include <unistd.h>
42#include <fcntl.h>
43#include <config.h>
44
45#include <lttng/lttng.h>
46#include <common/common.h>
47#include <common/compat/poll.h>
48#include <common/compat/socket.h>
f263b7fd 49#include <common/compat/endian.h>
d3e2ba59
JD
50#include <common/defaults.h>
51#include <common/futex.h>
2f8f53af 52#include <common/index/index.h>
d3e2ba59
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53#include <common/sessiond-comm/sessiond-comm.h>
54#include <common/sessiond-comm/inet.h>
55#include <common/sessiond-comm/relayd.h>
56#include <common/uri.h>
57#include <common/utils.h>
58
59#include "cmd.h"
60#include "live.h"
61#include "lttng-relayd.h"
d3e2ba59 62#include "utils.h"
eea7556c 63#include "health-relayd.h"
9b5e0863 64#include "testpoint.h"
2f8f53af 65#include "viewer-stream.h"
2a174661
DG
66#include "stream.h"
67#include "session.h"
68#include "ctf-trace.h"
58eb9381 69#include "connection.h"
7591bab1
MD
70#include "viewer-session.h"
71
72#define SESSION_BUF_DEFAULT_COUNT 16
d3e2ba59
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73
74static struct lttng_uri *live_uri;
75
d3e2ba59
JD
76/*
77 * This pipe is used to inform the worker thread that a command is queued and
78 * ready to be processed.
79 */
58eb9381 80static int live_conn_pipe[2] = { -1, -1 };
d3e2ba59
JD
81
82/* Shared between threads */
83static int live_dispatch_thread_exit;
84
85static pthread_t live_listener_thread;
86static pthread_t live_dispatcher_thread;
87static pthread_t live_worker_thread;
88
89/*
90 * Relay command queue.
91 *
92 * The live_thread_listener and live_thread_dispatcher communicate with this
93 * queue.
94 */
58eb9381 95static struct relay_conn_queue viewer_conn_queue;
d3e2ba59
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96
97static uint64_t last_relay_viewer_session_id;
7591bab1
MD
98static pthread_mutex_t last_relay_viewer_session_id_lock =
99 PTHREAD_MUTEX_INITIALIZER;
d3e2ba59
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100
101/*
102 * Cleanup the daemon
103 */
104static
178a0557 105void cleanup_relayd_live(void)
d3e2ba59
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106{
107 DBG("Cleaning up");
108
d3e2ba59
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109 free(live_uri);
110}
111
2f8f53af
DG
112/*
113 * Receive a request buffer using a given socket, destination allocated buffer
114 * of length size.
115 *
116 * Return the size of the received message or else a negative value on error
117 * with errno being set by recvmsg() syscall.
118 */
119static
120ssize_t recv_request(struct lttcomm_sock *sock, void *buf, size_t size)
121{
122 ssize_t ret;
123
2f8f53af
DG
124 ret = sock->ops->recvmsg(sock, buf, size, 0);
125 if (ret < 0 || ret != size) {
126 if (ret == 0) {
127 /* Orderly shutdown. Not necessary to print an error. */
128 DBG("Socket %d did an orderly shutdown", sock->fd);
129 } else {
130 ERR("Relay failed to receive request.");
131 }
132 ret = -1;
133 }
134
135 return ret;
136}
137
138/*
139 * Send a response buffer using a given socket, source allocated buffer of
140 * length size.
141 *
142 * Return the size of the sent message or else a negative value on error with
143 * errno being set by sendmsg() syscall.
144 */
145static
146ssize_t send_response(struct lttcomm_sock *sock, void *buf, size_t size)
147{
148 ssize_t ret;
149
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DG
150 ret = sock->ops->sendmsg(sock, buf, size, 0);
151 if (ret < 0) {
152 ERR("Relayd failed to send response.");
153 }
154
155 return ret;
156}
157
158/*
f04a971b
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159 * Atomically check if new streams got added in one of the sessions attached
160 * and reset the flag to 0.
2f8f53af
DG
161 *
162 * Returns 1 if new streams got added, 0 if nothing changed, a negative value
163 * on error.
164 */
165static
f04a971b 166int check_new_streams(struct relay_connection *conn)
2f8f53af 167{
2f8f53af 168 struct relay_session *session;
f04a971b
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169 unsigned long current_val;
170 int ret = 0;
2f8f53af 171
f04a971b
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172 if (!conn->viewer_session) {
173 goto end;
174 }
7591bab1
MD
175 rcu_read_lock();
176 cds_list_for_each_entry_rcu(session,
177 &conn->viewer_session->session_list,
178 viewer_session_node) {
179 if (!session_get(session)) {
180 continue;
181 }
f04a971b
JD
182 current_val = uatomic_cmpxchg(&session->new_streams, 1, 0);
183 ret = current_val;
7591bab1 184 session_put(session);
f04a971b
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185 if (ret == 1) {
186 goto end;
187 }
2f8f53af 188 }
f04a971b 189end:
7591bab1 190 rcu_read_unlock();
2f8f53af
DG
191 return ret;
192}
193
194/*
195 * Send viewer streams to the given socket. The ignore_sent_flag indicates if
196 * this function should ignore the sent flag or not.
197 *
198 * Return 0 on success or else a negative value.
199 */
200static
201ssize_t send_viewer_streams(struct lttcomm_sock *sock,
202 struct relay_session *session, unsigned int ignore_sent_flag)
203{
204 ssize_t ret;
205 struct lttng_viewer_stream send_stream;
206 struct lttng_ht_iter iter;
207 struct relay_viewer_stream *vstream;
208
2f8f53af
DG
209 rcu_read_lock();
210
211 cds_lfht_for_each_entry(viewer_streams_ht->ht, &iter.iter, vstream,
212 stream_n.node) {
2a174661
DG
213 struct ctf_trace *ctf_trace;
214
2f8f53af
DG
215 health_code_update();
216
7591bab1
MD
217 if (!viewer_stream_get(vstream)) {
218 continue;
219 }
220
221 pthread_mutex_lock(&vstream->stream->lock);
2f8f53af 222 /* Ignore if not the same session. */
7591bab1 223 if (vstream->stream->trace->session->id != session->id ||
2f8f53af 224 (!ignore_sent_flag && vstream->sent_flag)) {
7591bab1
MD
225 pthread_mutex_unlock(&vstream->stream->lock);
226 viewer_stream_put(vstream);
2f8f53af
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227 continue;
228 }
229
7591bab1
MD
230 ctf_trace = vstream->stream->trace;
231 send_stream.id = htobe64(vstream->stream->stream_handle);
2a174661 232 send_stream.ctf_trace_id = htobe64(ctf_trace->id);
7591bab1
MD
233 send_stream.metadata_flag = htobe32(
234 vstream->stream->is_metadata);
2f8f53af
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235 strncpy(send_stream.path_name, vstream->path_name,
236 sizeof(send_stream.path_name));
237 strncpy(send_stream.channel_name, vstream->channel_name,
238 sizeof(send_stream.channel_name));
239
7591bab1
MD
240 DBG("Sending stream %" PRIu64 " to viewer",
241 vstream->stream->stream_handle);
242 vstream->sent_flag = 1;
243 pthread_mutex_unlock(&vstream->stream->lock);
244
2f8f53af 245 ret = send_response(sock, &send_stream, sizeof(send_stream));
7591bab1 246 viewer_stream_put(vstream);
2f8f53af
DG
247 if (ret < 0) {
248 goto end_unlock;
249 }
2f8f53af
DG
250 }
251
252 ret = 0;
253
254end_unlock:
255 rcu_read_unlock();
256 return ret;
257}
258
259/*
260 * Create every viewer stream possible for the given session with the seek
261 * type. Three counters *can* be return which are in order the total amount of
262 * viewer stream of the session, the number of unsent stream and the number of
263 * stream created. Those counters can be NULL and thus will be ignored.
264 *
265 * Return 0 on success or else a negative value.
266 */
267static
268int make_viewer_streams(struct relay_session *session,
269 enum lttng_viewer_seek seek_t, uint32_t *nb_total, uint32_t *nb_unsent,
bddf80e4 270 uint32_t *nb_created, bool *closed)
2f8f53af
DG
271{
272 int ret;
2f8f53af 273 struct lttng_ht_iter iter;
2a174661 274 struct ctf_trace *ctf_trace;
2f8f53af
DG
275
276 assert(session);
277
278 /*
7591bab1
MD
279 * Hold the session lock to ensure that we see either none or
280 * all initial streams for a session, but no intermediate state.
2f8f53af 281 */
7591bab1 282 pthread_mutex_lock(&session->lock);
2f8f53af 283
bddf80e4
MD
284 if (session->connection_closed) {
285 *closed = true;
286 }
287
2f8f53af 288 /*
7591bab1
MD
289 * Create viewer streams for relay streams that are ready to be
290 * used for a the given session id only.
2f8f53af 291 */
2a174661
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292 rcu_read_lock();
293 cds_lfht_for_each_entry(session->ctf_traces_ht->ht, &iter.iter, ctf_trace,
294 node.node) {
295 struct relay_stream *stream;
2f8f53af
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296
297 health_code_update();
298
7591bab1 299 if (!ctf_trace_get(ctf_trace)) {
2f8f53af
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300 continue;
301 }
302
7591bab1 303 cds_list_for_each_entry_rcu(stream, &ctf_trace->stream_list, stream_node) {
2a174661
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304 struct relay_viewer_stream *vstream;
305
7591bab1 306 if (!stream_get(stream)) {
2a174661
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307 continue;
308 }
7591bab1
MD
309 /*
310 * stream published is protected by the session
311 * lock.
312 */
313 if (!stream->published) {
314 goto next;
315 }
c0bae11d
MD
316 /*
317 * Stream has no data, don't consider it yet.
318 */
9d0999c1
MD
319 if (stream->is_metadata) {
320 if (!stream->metadata_received) {
321 goto next;
322 }
323 } else {
324 if (stream->prev_seq == -1ULL) {
325 goto next;
326 }
c0bae11d 327 }
7591bab1 328 vstream = viewer_stream_get_by_id(stream->stream_handle);
2f8f53af 329 if (!vstream) {
7591bab1 330 vstream = viewer_stream_create(stream, seek_t);
2a174661
DG
331 if (!vstream) {
332 ret = -1;
7591bab1
MD
333 ctf_trace_put(ctf_trace);
334 stream_put(stream);
2a174661
DG
335 goto error_unlock;
336 }
2a174661
DG
337
338 if (nb_created) {
339 /* Update number of created stream counter. */
340 (*nb_created)++;
341 }
2229a09c
MD
342 /*
343 * Ensure a self-reference is preserved even
344 * after we have put our local reference.
345 */
346 viewer_stream_get(vstream);
7591bab1
MD
347 } else {
348 if (!vstream->sent_flag && nb_unsent) {
349 /* Update number of unsent stream counter. */
350 (*nb_unsent)++;
351 }
2f8f53af 352 }
2a174661
DG
353 /* Update number of total stream counter. */
354 if (nb_total) {
2229a09c
MD
355 if (stream->is_metadata) {
356 if (!stream->closed ||
357 stream->metadata_received > vstream->metadata_sent) {
358 (*nb_total)++;
359 }
360 } else {
361 if (!stream->closed ||
362 !(((int64_t) (stream->prev_seq - stream->last_net_seq_num)) >= 0)) {
363
364 (*nb_total)++;
365 }
366 }
2f8f53af 367 }
2229a09c
MD
368 /* Put local reference. */
369 viewer_stream_put(vstream);
7591bab1
MD
370 next:
371 stream_put(stream);
2f8f53af 372 }
7591bab1 373 ctf_trace_put(ctf_trace);
2f8f53af
DG
374 }
375
376 ret = 0;
377
378error_unlock:
2a174661 379 rcu_read_unlock();
7591bab1 380 pthread_mutex_unlock(&session->lock);
2f8f53af
DG
381 return ret;
382}
383
b4aacfdc 384int relayd_live_stop(void)
d3e2ba59 385{
b4aacfdc 386 /* Stop dispatch thread */
d3e2ba59 387 CMM_STORE_SHARED(live_dispatch_thread_exit, 1);
58eb9381 388 futex_nto1_wake(&viewer_conn_queue.futex);
b4aacfdc 389 return 0;
d3e2ba59
JD
390}
391
d3e2ba59
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392/*
393 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
394 */
395static
396int create_thread_poll_set(struct lttng_poll_event *events, int size)
397{
398 int ret;
399
400 if (events == NULL || size == 0) {
401 ret = -1;
402 goto error;
403 }
404
405 ret = lttng_poll_create(events, size, LTTNG_CLOEXEC);
406 if (ret < 0) {
407 goto error;
408 }
409
410 /* Add quit pipe */
bcf4a440 411 ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN | LPOLLERR);
d3e2ba59
JD
412 if (ret < 0) {
413 goto error;
414 }
415
416 return 0;
417
418error:
419 return ret;
420}
421
422/*
423 * Check if the thread quit pipe was triggered.
424 *
425 * Return 1 if it was triggered else 0;
426 */
427static
bcf4a440 428int check_thread_quit_pipe(int fd, uint32_t events)
d3e2ba59 429{
bcf4a440 430 if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) {
d3e2ba59
JD
431 return 1;
432 }
433
434 return 0;
435}
436
437/*
438 * Create and init socket from uri.
439 */
440static
441struct lttcomm_sock *init_socket(struct lttng_uri *uri)
442{
443 int ret;
444 struct lttcomm_sock *sock = NULL;
445
446 sock = lttcomm_alloc_sock_from_uri(uri);
447 if (sock == NULL) {
448 ERR("Allocating socket");
449 goto error;
450 }
451
452 ret = lttcomm_create_sock(sock);
453 if (ret < 0) {
454 goto error;
455 }
456 DBG("Listening on sock %d for live", sock->fd);
457
458 ret = sock->ops->bind(sock);
459 if (ret < 0) {
460 goto error;
461 }
462
463 ret = sock->ops->listen(sock, -1);
464 if (ret < 0) {
465 goto error;
466
467 }
468
469 return sock;
470
471error:
472 if (sock) {
473 lttcomm_destroy_sock(sock);
474 }
475 return NULL;
476}
477
478/*
479 * This thread manages the listening for new connections on the network
480 */
481static
482void *thread_listener(void *data)
483{
484 int i, ret, pollfd, err = -1;
d3e2ba59
JD
485 uint32_t revents, nb_fd;
486 struct lttng_poll_event events;
487 struct lttcomm_sock *live_control_sock;
488
489 DBG("[thread] Relay live listener started");
490
eea7556c
MD
491 health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_LISTENER);
492
493 health_code_update();
494
d3e2ba59
JD
495 live_control_sock = init_socket(live_uri);
496 if (!live_control_sock) {
497 goto error_sock_control;
498 }
499
fb4d42ab 500 /* Pass 2 as size here for the thread quit pipe and control sockets. */
d3e2ba59
JD
501 ret = create_thread_poll_set(&events, 2);
502 if (ret < 0) {
503 goto error_create_poll;
504 }
505
506 /* Add the control socket */
507 ret = lttng_poll_add(&events, live_control_sock->fd, LPOLLIN | LPOLLRDHUP);
508 if (ret < 0) {
509 goto error_poll_add;
510 }
511
3fd27398
MD
512 lttng_relay_notify_ready();
513
9b5e0863
MD
514 if (testpoint(relayd_thread_live_listener)) {
515 goto error_testpoint;
516 }
517
d3e2ba59 518 while (1) {
eea7556c
MD
519 health_code_update();
520
d3e2ba59
JD
521 DBG("Listener accepting live viewers connections");
522
523restart:
eea7556c 524 health_poll_entry();
d3e2ba59 525 ret = lttng_poll_wait(&events, -1);
eea7556c 526 health_poll_exit();
d3e2ba59
JD
527 if (ret < 0) {
528 /*
529 * Restart interrupted system call.
530 */
531 if (errno == EINTR) {
532 goto restart;
533 }
534 goto error;
535 }
536 nb_fd = ret;
537
538 DBG("Relay new viewer connection received");
539 for (i = 0; i < nb_fd; i++) {
eea7556c
MD
540 health_code_update();
541
d3e2ba59
JD
542 /* Fetch once the poll data */
543 revents = LTTNG_POLL_GETEV(&events, i);
544 pollfd = LTTNG_POLL_GETFD(&events, i);
545
fd20dac9
MD
546 if (!revents) {
547 /* No activity for this FD (poll implementation). */
548 continue;
549 }
550
d3e2ba59 551 /* Thread quit pipe has been closed. Killing thread. */
bcf4a440 552 ret = check_thread_quit_pipe(pollfd, revents);
d3e2ba59
JD
553 if (ret) {
554 err = 0;
555 goto exit;
556 }
557
558 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
559 ERR("socket poll error");
560 goto error;
561 } else if (revents & LPOLLIN) {
562 /*
7591bab1
MD
563 * A new connection is requested, therefore a
564 * viewer connection is allocated in this
565 * thread, enqueued to a global queue and
566 * dequeued (and freed) in the worker thread.
d3e2ba59 567 */
58eb9381
DG
568 int val = 1;
569 struct relay_connection *new_conn;
d3e2ba59
JD
570 struct lttcomm_sock *newsock;
571
d3e2ba59
JD
572 newsock = live_control_sock->ops->accept(live_control_sock);
573 if (!newsock) {
574 PERROR("accepting control sock");
d3e2ba59
JD
575 goto error;
576 }
577 DBG("Relay viewer connection accepted socket %d", newsock->fd);
58eb9381 578
d3e2ba59 579 ret = setsockopt(newsock->fd, SOL_SOCKET, SO_REUSEADDR, &val,
58eb9381 580 sizeof(val));
d3e2ba59
JD
581 if (ret < 0) {
582 PERROR("setsockopt inet");
583 lttcomm_destroy_sock(newsock);
d3e2ba59
JD
584 goto error;
585 }
7591bab1
MD
586 new_conn = connection_create(newsock, RELAY_CONNECTION_UNKNOWN);
587 if (!new_conn) {
588 lttcomm_destroy_sock(newsock);
589 goto error;
590 }
591 /* Ownership assumed by the connection. */
592 newsock = NULL;
d3e2ba59 593
58eb9381 594 /* Enqueue request for the dispatcher thread. */
8bdee6e2
SM
595 cds_wfcq_enqueue(&viewer_conn_queue.head, &viewer_conn_queue.tail,
596 &new_conn->qnode);
d3e2ba59
JD
597
598 /*
7591bab1
MD
599 * Wake the dispatch queue futex.
600 * Implicit memory barrier with the
601 * exchange in cds_wfcq_enqueue.
d3e2ba59 602 */
58eb9381 603 futex_nto1_wake(&viewer_conn_queue.futex);
d3e2ba59
JD
604 }
605 }
606 }
607
608exit:
609error:
610error_poll_add:
9b5e0863 611error_testpoint:
d3e2ba59
JD
612 lttng_poll_clean(&events);
613error_create_poll:
614 if (live_control_sock->fd >= 0) {
615 ret = live_control_sock->ops->close(live_control_sock);
616 if (ret) {
617 PERROR("close");
618 }
619 }
620 lttcomm_destroy_sock(live_control_sock);
621error_sock_control:
622 if (err) {
eea7556c 623 health_error();
d3e2ba59
JD
624 DBG("Live viewer listener thread exited with error");
625 }
eea7556c 626 health_unregister(health_relayd);
d3e2ba59 627 DBG("Live viewer listener thread cleanup complete");
b4aacfdc
MD
628 if (lttng_relay_stop_threads()) {
629 ERR("Error stopping threads");
178a0557 630 }
d3e2ba59
JD
631 return NULL;
632}
633
634/*
635 * This thread manages the dispatching of the requests to worker threads
636 */
637static
638void *thread_dispatcher(void *data)
639{
6cd525e8
MD
640 int err = -1;
641 ssize_t ret;
8bdee6e2 642 struct cds_wfcq_node *node;
58eb9381 643 struct relay_connection *conn = NULL;
d3e2ba59
JD
644
645 DBG("[thread] Live viewer relay dispatcher started");
646
eea7556c
MD
647 health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_DISPATCHER);
648
9b5e0863
MD
649 if (testpoint(relayd_thread_live_dispatcher)) {
650 goto error_testpoint;
651 }
652
eea7556c
MD
653 health_code_update();
654
d3e2ba59 655 while (!CMM_LOAD_SHARED(live_dispatch_thread_exit)) {
eea7556c
MD
656 health_code_update();
657
d3e2ba59 658 /* Atomically prepare the queue futex */
58eb9381 659 futex_nto1_prepare(&viewer_conn_queue.futex);
d3e2ba59
JD
660
661 do {
eea7556c
MD
662 health_code_update();
663
d3e2ba59 664 /* Dequeue commands */
8bdee6e2
SM
665 node = cds_wfcq_dequeue_blocking(&viewer_conn_queue.head,
666 &viewer_conn_queue.tail);
d3e2ba59
JD
667 if (node == NULL) {
668 DBG("Woken up but nothing in the live-viewer "
669 "relay command queue");
670 /* Continue thread execution */
671 break;
672 }
58eb9381 673 conn = caa_container_of(node, struct relay_connection, qnode);
d3e2ba59 674 DBG("Dispatching viewer request waiting on sock %d",
58eb9381 675 conn->sock->fd);
d3e2ba59
JD
676
677 /*
7591bab1
MD
678 * Inform worker thread of the new request. This
679 * call is blocking so we can be assured that
680 * the data will be read at some point in time
681 * or wait to the end of the world :)
d3e2ba59 682 */
58eb9381
DG
683 ret = lttng_write(live_conn_pipe[1], &conn, sizeof(conn));
684 if (ret < 0) {
685 PERROR("write conn pipe");
7591bab1 686 connection_put(conn);
d3e2ba59
JD
687 goto error;
688 }
689 } while (node != NULL);
690
691 /* Futex wait on queue. Blocking call on futex() */
eea7556c 692 health_poll_entry();
58eb9381 693 futex_nto1_wait(&viewer_conn_queue.futex);
eea7556c 694 health_poll_exit();
d3e2ba59
JD
695 }
696
eea7556c
MD
697 /* Normal exit, no error */
698 err = 0;
699
d3e2ba59 700error:
9b5e0863 701error_testpoint:
eea7556c
MD
702 if (err) {
703 health_error();
704 ERR("Health error occurred in %s", __func__);
705 }
706 health_unregister(health_relayd);
d3e2ba59 707 DBG("Live viewer dispatch thread dying");
b4aacfdc
MD
708 if (lttng_relay_stop_threads()) {
709 ERR("Error stopping threads");
178a0557 710 }
d3e2ba59
JD
711 return NULL;
712}
713
714/*
715 * Establish connection with the viewer and check the versions.
716 *
717 * Return 0 on success or else negative value.
718 */
719static
58eb9381 720int viewer_connect(struct relay_connection *conn)
d3e2ba59
JD
721{
722 int ret;
723 struct lttng_viewer_connect reply, msg;
724
58eb9381 725 conn->version_check_done = 1;
d3e2ba59 726
eea7556c
MD
727 health_code_update();
728
2f8f53af
DG
729 DBG("Viewer is establishing a connection to the relayd.");
730
58eb9381 731 ret = recv_request(conn->sock, &msg, sizeof(msg));
2f8f53af 732 if (ret < 0) {
d3e2ba59
JD
733 goto end;
734 }
735
eea7556c
MD
736 health_code_update();
737
f46b2ce6 738 memset(&reply, 0, sizeof(reply));
d3e2ba59
JD
739 reply.major = RELAYD_VERSION_COMM_MAJOR;
740 reply.minor = RELAYD_VERSION_COMM_MINOR;
741
742 /* Major versions must be the same */
743 if (reply.major != be32toh(msg.major)) {
2f8f53af
DG
744 DBG("Incompatible major versions ([relayd] %u vs [client] %u)",
745 reply.major, be32toh(msg.major));
72180669 746 ret = -1;
d3e2ba59
JD
747 goto end;
748 }
749
58eb9381 750 conn->major = reply.major;
d3e2ba59
JD
751 /* We adapt to the lowest compatible version */
752 if (reply.minor <= be32toh(msg.minor)) {
58eb9381 753 conn->minor = reply.minor;
d3e2ba59 754 } else {
58eb9381 755 conn->minor = be32toh(msg.minor);
d3e2ba59
JD
756 }
757
c4e361a4 758 if (be32toh(msg.type) == LTTNG_VIEWER_CLIENT_COMMAND) {
58eb9381 759 conn->type = RELAY_VIEWER_COMMAND;
c4e361a4 760 } else if (be32toh(msg.type) == LTTNG_VIEWER_CLIENT_NOTIFICATION) {
58eb9381 761 conn->type = RELAY_VIEWER_NOTIFICATION;
d3e2ba59
JD
762 } else {
763 ERR("Unknown connection type : %u", be32toh(msg.type));
764 ret = -1;
765 goto end;
766 }
767
768 reply.major = htobe32(reply.major);
769 reply.minor = htobe32(reply.minor);
58eb9381 770 if (conn->type == RELAY_VIEWER_COMMAND) {
93b4787b 771 /*
7591bab1
MD
772 * Increment outside of htobe64 macro, because the argument can
773 * be used more than once within the macro, and thus the
774 * operation may be undefined.
93b4787b 775 */
7591bab1 776 pthread_mutex_lock(&last_relay_viewer_session_id_lock);
93b4787b 777 last_relay_viewer_session_id++;
7591bab1 778 pthread_mutex_unlock(&last_relay_viewer_session_id_lock);
93b4787b 779 reply.viewer_session_id = htobe64(last_relay_viewer_session_id);
d3e2ba59 780 }
eea7556c
MD
781
782 health_code_update();
783
58eb9381 784 ret = send_response(conn->sock, &reply, sizeof(reply));
d3e2ba59 785 if (ret < 0) {
2f8f53af 786 goto end;
d3e2ba59
JD
787 }
788
eea7556c
MD
789 health_code_update();
790
58eb9381 791 DBG("Version check done using protocol %u.%u", conn->major, conn->minor);
d3e2ba59
JD
792 ret = 0;
793
794end:
795 return ret;
796}
797
798/*
799 * Send the viewer the list of current sessions.
7591bab1
MD
800 * We need to create a copy of the hash table content because otherwise
801 * we cannot assume the number of entries stays the same between getting
802 * the number of HT elements and iteration over the HT.
d3e2ba59
JD
803 *
804 * Return 0 on success or else a negative value.
805 */
806static
58eb9381 807int viewer_list_sessions(struct relay_connection *conn)
d3e2ba59
JD
808{
809 int ret;
810 struct lttng_viewer_list_sessions session_list;
d3e2ba59 811 struct lttng_ht_iter iter;
d3e2ba59 812 struct relay_session *session;
7591bab1
MD
813 struct lttng_viewer_session *send_session_buf = NULL;
814 uint32_t buf_count = SESSION_BUF_DEFAULT_COUNT;
815 uint32_t count = 0;
d3e2ba59
JD
816
817 DBG("List sessions received");
818
7591bab1
MD
819 send_session_buf = zmalloc(SESSION_BUF_DEFAULT_COUNT * sizeof(*send_session_buf));
820 if (!send_session_buf) {
821 return -1;
d3e2ba59
JD
822 }
823
7591bab1
MD
824 rcu_read_lock();
825 cds_lfht_for_each_entry(sessions_ht->ht, &iter.iter, session,
2f8f53af 826 session_n.node) {
7591bab1 827 struct lttng_viewer_session *send_session;
d3e2ba59 828
eea7556c
MD
829 health_code_update();
830
7591bab1
MD
831 if (count >= buf_count) {
832 struct lttng_viewer_session *newbuf;
833 uint32_t new_buf_count = buf_count << 1;
eea7556c 834
7591bab1
MD
835 newbuf = realloc(send_session_buf,
836 new_buf_count * sizeof(*send_session_buf));
837 if (!newbuf) {
838 ret = -1;
839 rcu_read_unlock();
840 goto end_free;
841 }
842 send_session_buf = newbuf;
843 buf_count = new_buf_count;
6763619c 844 }
7591bab1
MD
845 send_session = &send_session_buf[count];
846 strncpy(send_session->session_name, session->session_name,
847 sizeof(send_session->session_name));
848 strncpy(send_session->hostname, session->hostname,
849 sizeof(send_session->hostname));
850 send_session->id = htobe64(session->id);
851 send_session->live_timer = htobe32(session->live_timer);
852 if (session->viewer_attached) {
853 send_session->clients = htobe32(1);
854 } else {
855 send_session->clients = htobe32(0);
d227d5bd 856 }
7591bab1
MD
857 send_session->streams = htobe32(session->stream_count);
858 count++;
859 }
860 rcu_read_unlock();
d227d5bd 861
7591bab1 862 session_list.sessions_count = htobe32(count);
d227d5bd 863
7591bab1 864 health_code_update();
d227d5bd 865
7591bab1
MD
866 ret = send_response(conn->sock, &session_list, sizeof(session_list));
867 if (ret < 0) {
868 goto end_free;
d227d5bd 869 }
d227d5bd 870
7591bab1 871 health_code_update();
d227d5bd 872
7591bab1
MD
873 ret = send_response(conn->sock, send_session_buf,
874 count * sizeof(*send_session_buf));
875 if (ret < 0) {
876 goto end_free;
d227d5bd 877 }
7591bab1 878 health_code_update();
d227d5bd 879
7591bab1
MD
880 ret = 0;
881end_free:
882 free(send_session_buf);
883 return ret;
d227d5bd
JD
884}
885
80e8027a 886/*
7591bab1 887 * Send the viewer the list of current streams.
80e8027a
JD
888 */
889static
58eb9381 890int viewer_get_new_streams(struct relay_connection *conn)
80e8027a
JD
891{
892 int ret, send_streams = 0;
7591bab1 893 uint32_t nb_created = 0, nb_unsent = 0, nb_streams = 0, nb_total = 0;
80e8027a
JD
894 struct lttng_viewer_new_streams_request request;
895 struct lttng_viewer_new_streams_response response;
80e8027a 896 struct relay_session *session;
6763619c 897 uint64_t session_id;
bddf80e4 898 bool closed = false;
80e8027a 899
58eb9381 900 assert(conn);
80e8027a
JD
901
902 DBG("Get new streams received");
903
80e8027a
JD
904 health_code_update();
905
2f8f53af 906 /* Receive the request from the connected client. */
58eb9381 907 ret = recv_request(conn->sock, &request, sizeof(request));
2f8f53af 908 if (ret < 0) {
80e8027a
JD
909 goto error;
910 }
6763619c 911 session_id = be64toh(request.session_id);
80e8027a
JD
912
913 health_code_update();
914
53efb85a
MD
915 memset(&response, 0, sizeof(response));
916
7591bab1 917 session = session_get_by_id(session_id);
2f8f53af 918 if (!session) {
6763619c 919 DBG("Relay session %" PRIu64 " not found", session_id);
c4e361a4 920 response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_ERR);
80e8027a
JD
921 goto send_reply;
922 }
923
7591bab1 924 if (!viewer_session_is_attached(conn->viewer_session, session)) {
80e8027a 925 send_streams = 0;
c4e361a4 926 response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_ERR);
80e8027a
JD
927 goto send_reply;
928 }
929
6763619c
JD
930 send_streams = 1;
931 response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_OK);
932
7591bab1 933 ret = make_viewer_streams(session, LTTNG_VIEWER_SEEK_LAST, &nb_total, &nb_unsent,
bddf80e4 934 &nb_created, &closed);
2f8f53af 935 if (ret < 0) {
7591bab1 936 goto end_put_session;
2f8f53af
DG
937 }
938 /* Only send back the newly created streams with the unsent ones. */
939 nb_streams = nb_created + nb_unsent;
80e8027a
JD
940 response.streams_count = htobe32(nb_streams);
941
4479f682 942 /*
2229a09c
MD
943 * If the session is closed, HUP when there are no more streams
944 * with data.
4479f682 945 */
bddf80e4 946 if (closed && nb_total == 0) {
4479f682 947 send_streams = 0;
bddf80e4 948 response.streams_count = 0;
4479f682
JD
949 response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_HUP);
950 goto send_reply;
951 }
952
80e8027a
JD
953send_reply:
954 health_code_update();
58eb9381 955 ret = send_response(conn->sock, &response, sizeof(response));
80e8027a 956 if (ret < 0) {
7591bab1 957 goto end_put_session;
80e8027a
JD
958 }
959 health_code_update();
960
961 /*
7591bab1
MD
962 * Unknown or empty session, just return gracefully, the viewer
963 * knows what is happening.
80e8027a
JD
964 */
965 if (!send_streams || !nb_streams) {
966 ret = 0;
7591bab1 967 goto end_put_session;
80e8027a
JD
968 }
969
2f8f53af 970 /*
7591bab1
MD
971 * Send stream and *DON'T* ignore the sent flag so every viewer
972 * streams that were not sent from that point will be sent to
973 * the viewer.
2f8f53af 974 */
58eb9381 975 ret = send_viewer_streams(conn->sock, session, 0);
2f8f53af 976 if (ret < 0) {
7591bab1 977 goto end_put_session;
80e8027a
JD
978 }
979
7591bab1
MD
980end_put_session:
981 if (session) {
982 session_put(session);
983 }
80e8027a
JD
984error:
985 return ret;
986}
987
d3e2ba59
JD
988/*
989 * Send the viewer the list of current sessions.
990 */
991static
58eb9381 992int viewer_attach_session(struct relay_connection *conn)
d3e2ba59 993{
2f8f53af
DG
994 int send_streams = 0;
995 ssize_t ret;
80e8027a 996 uint32_t nb_streams = 0;
2f8f53af 997 enum lttng_viewer_seek seek_type;
d3e2ba59
JD
998 struct lttng_viewer_attach_session_request request;
999 struct lttng_viewer_attach_session_response response;
7591bab1 1000 struct relay_session *session = NULL;
bddf80e4 1001 bool closed = false;
d3e2ba59 1002
58eb9381 1003 assert(conn);
d3e2ba59 1004
eea7556c
MD
1005 health_code_update();
1006
2f8f53af 1007 /* Receive the request from the connected client. */
58eb9381 1008 ret = recv_request(conn->sock, &request, sizeof(request));
2f8f53af 1009 if (ret < 0) {
d3e2ba59
JD
1010 goto error;
1011 }
1012
eea7556c
MD
1013 health_code_update();
1014
53efb85a
MD
1015 memset(&response, 0, sizeof(response));
1016
c3b7390b
JD
1017 if (!conn->viewer_session) {
1018 DBG("Client trying to attach before creating a live viewer session");
1019 response.status = htobe32(LTTNG_VIEWER_ATTACH_NO_SESSION);
1020 goto send_reply;
1021 }
1022
7591bab1 1023 session = session_get_by_id(be64toh(request.session_id));
2f8f53af 1024 if (!session) {
d3e2ba59
JD
1025 DBG("Relay session %" PRIu64 " not found",
1026 be64toh(request.session_id));
c4e361a4 1027 response.status = htobe32(LTTNG_VIEWER_ATTACH_UNK);
d3e2ba59
JD
1028 goto send_reply;
1029 }
7591bab1
MD
1030 DBG("Attach session ID %" PRIu64 " received",
1031 be64toh(request.session_id));
d3e2ba59 1032
7591bab1 1033 if (session->live_timer == 0) {
d3e2ba59 1034 DBG("Not live session");
c4e361a4 1035 response.status = htobe32(LTTNG_VIEWER_ATTACH_NOT_LIVE);
d3e2ba59 1036 goto send_reply;
7591bab1
MD
1037 }
1038
1039 send_streams = 1;
1040 ret = viewer_session_attach(conn->viewer_session, session);
1041 if (ret) {
1042 DBG("Already a viewer attached");
1043 response.status = htobe32(LTTNG_VIEWER_ATTACH_ALREADY);
1044 goto send_reply;
d3e2ba59
JD
1045 }
1046
1047 switch (be32toh(request.seek)) {
c4e361a4
JD
1048 case LTTNG_VIEWER_SEEK_BEGINNING:
1049 case LTTNG_VIEWER_SEEK_LAST:
7591bab1 1050 response.status = htobe32(LTTNG_VIEWER_ATTACH_OK);
2f8f53af 1051 seek_type = be32toh(request.seek);
d3e2ba59
JD
1052 break;
1053 default:
1054 ERR("Wrong seek parameter");
c4e361a4 1055 response.status = htobe32(LTTNG_VIEWER_ATTACH_SEEK_ERR);
d3e2ba59
JD
1056 send_streams = 0;
1057 goto send_reply;
1058 }
1059
bddf80e4
MD
1060 ret = make_viewer_streams(session, seek_type, &nb_streams, NULL,
1061 NULL, &closed);
2f8f53af 1062 if (ret < 0) {
7591bab1 1063 goto end_put_session;
d3e2ba59 1064 }
2f8f53af 1065 response.streams_count = htobe32(nb_streams);
d3e2ba59 1066
bddf80e4
MD
1067 /*
1068 * If the session is closed when the viewer is attaching, it
1069 * means some of the streams may have been concurrently removed,
1070 * so we don't allow the viewer to attach, even if there are
1071 * streams available.
1072 */
1073 if (closed) {
1074 send_streams = 0;
1075 response.streams_count = 0;
1076 response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_HUP);
1077 goto send_reply;
1078 }
1079
d3e2ba59 1080send_reply:
eea7556c 1081 health_code_update();
58eb9381 1082 ret = send_response(conn->sock, &response, sizeof(response));
d3e2ba59 1083 if (ret < 0) {
7591bab1 1084 goto end_put_session;
d3e2ba59 1085 }
eea7556c 1086 health_code_update();
d3e2ba59
JD
1087
1088 /*
7591bab1
MD
1089 * Unknown or empty session, just return gracefully, the viewer
1090 * knows what is happening.
d3e2ba59 1091 */
157df586 1092 if (!send_streams || !nb_streams) {
d3e2ba59 1093 ret = 0;
7591bab1 1094 goto end_put_session;
d3e2ba59
JD
1095 }
1096
2f8f53af 1097 /* Send stream and ignore the sent flag. */
58eb9381 1098 ret = send_viewer_streams(conn->sock, session, 1);
2f8f53af 1099 if (ret < 0) {
7591bab1 1100 goto end_put_session;
d3e2ba59 1101 }
d3e2ba59 1102
7591bab1
MD
1103end_put_session:
1104 if (session) {
1105 session_put(session);
1106 }
4a9daf17
JD
1107error:
1108 return ret;
1109}
1110
878c34cf
DG
1111/*
1112 * Open the index file if needed for the given vstream.
1113 *
7591bab1
MD
1114 * If an index file is successfully opened, the vstream index_fd set with
1115 * it.
878c34cf
DG
1116 *
1117 * Return 0 on success, a negative value on error (-ENOENT if not ready yet).
7591bab1
MD
1118 *
1119 * Called with rstream lock held.
878c34cf
DG
1120 */
1121static int try_open_index(struct relay_viewer_stream *vstream,
1122 struct relay_stream *rstream)
1123{
1124 int ret = 0;
1125
7591bab1 1126 if (vstream->index_fd) {
878c34cf
DG
1127 goto end;
1128 }
1129
1130 /*
7591bab1 1131 * First time, we open the index file and at least one index is ready.
878c34cf 1132 */
7591bab1 1133 if (rstream->total_index_received == 0) {
878c34cf
DG
1134 ret = -ENOENT;
1135 goto end;
1136 }
1137 ret = index_open(vstream->path_name, vstream->channel_name,
7591bab1
MD
1138 vstream->stream->tracefile_count,
1139 vstream->current_tracefile_id);
878c34cf 1140 if (ret >= 0) {
7591bab1
MD
1141 vstream->index_fd = stream_fd_create(ret);
1142 if (!vstream->index_fd) {
1143 if (close(ret)) {
1144 PERROR("close");
1145 }
1146 ret = -1;
1147 } else {
1148 ret = 0;
1149 }
878c34cf
DG
1150 goto end;
1151 }
1152
1153end:
1154 return ret;
1155}
1156
1157/*
7591bab1
MD
1158 * Check the status of the index for the given stream. This function
1159 * updates the index structure if needed and can put (close) the vstream
1160 * in the HUP situation.
1161 *
1162 * Return 0 means that we can proceed with the index. A value of 1 means
1163 * that the index has been updated and is ready to be sent to the
1164 * client. A negative value indicates an error that can't be handled.
878c34cf 1165 *
7591bab1 1166 * Called with rstream lock held.
878c34cf
DG
1167 */
1168static int check_index_status(struct relay_viewer_stream *vstream,
1169 struct relay_stream *rstream, struct ctf_trace *trace,
1170 struct lttng_viewer_index *index)
1171{
1172 int ret;
1173
7591bab1
MD
1174 if (trace->session->connection_closed
1175 && rstream->total_index_received
1176 == vstream->last_sent_index) {
1177 /* Last index sent and session connection is closed. */
1178 index->status = htobe32(LTTNG_VIEWER_INDEX_HUP);
1179 goto hup;
1180 } else if (rstream->beacon_ts_end != -1ULL &&
1181 rstream->total_index_received
1182 == vstream->last_sent_index) {
1183 /*
1184 * We've received a synchronization beacon and the last index
1185 * available has been sent, the index for now is inactive.
1186 *
1187 * In this case, we have received a beacon which allows us to
1188 * inform the client of a time interval during which we can
1189 * guarantee that there are no events to read (and never will
1190 * be).
1191 */
1192 index->status = htobe32(LTTNG_VIEWER_INDEX_INACTIVE);
1193 index->timestamp_end = htobe64(rstream->beacon_ts_end);
1194 index->stream_id = htobe64(rstream->ctf_stream_id);
1195 goto index_ready;
1196 } else if (rstream->total_index_received <= vstream->last_sent_index) {
1197 /*
1198 * This actually checks the case where recv == last_sent.
1199 * In this case, we have not received a beacon. Therefore, we
1200 * can only ask the client to retry later.
1201 */
1202 index->status = htobe32(LTTNG_VIEWER_INDEX_RETRY);
1203 goto index_ready;
1204 } else if (!viewer_stream_is_tracefile_seq_readable(vstream,
1205 vstream->current_tracefile_seq)) {
1206 /*
1207 * The producer has overwritten our current file. We
1208 * need to rotate.
1209 */
1210 DBG("Viewer stream %" PRIu64 " rotation due to overwrite",
1211 vstream->stream->stream_handle);
1212 ret = viewer_stream_rotate(vstream);
1213 if (ret < 0) {
1214 goto end;
1215 } else if (ret == 1) {
1216 /* EOF across entire stream. */
1217 index->status = htobe32(LTTNG_VIEWER_INDEX_HUP);
1218 goto hup;
1219 }
1220 assert(viewer_stream_is_tracefile_seq_readable(vstream,
1221 vstream->current_tracefile_seq));
1222 /* ret == 0 means successful so we continue. */
1223 ret = 0;
1224 } else {
1225 ssize_t read_ret;
1226 char tmp[1];
1227
1228 /*
1229 * Use EOF on current index file to find out when we
1230 * need to rotate.
1231 */
1232 read_ret = lttng_read(vstream->index_fd->fd, tmp, 1);
1233 if (read_ret == 1) {
1234 off_t seek_ret;
1235
1236 /* There is still data to read. Rewind position. */
1237 seek_ret = lseek(vstream->index_fd->fd, -1, SEEK_CUR);
1238 if (seek_ret < 0) {
1239 ret = -1;
1240 goto end;
1241 }
1242 ret = 0;
1243 } else if (read_ret == 0) {
1244 /* EOF. We need to rotate. */
1245 DBG("Viewer stream %" PRIu64 " rotation due to EOF",
1246 vstream->stream->stream_handle);
1247 ret = viewer_stream_rotate(vstream);
878c34cf 1248 if (ret < 0) {
7591bab1 1249 goto end;
878c34cf 1250 } else if (ret == 1) {
7591bab1 1251 /* EOF across entire stream. */
878c34cf
DG
1252 index->status = htobe32(LTTNG_VIEWER_INDEX_HUP);
1253 goto hup;
1254 }
7591bab1
MD
1255 assert(viewer_stream_is_tracefile_seq_readable(vstream,
1256 vstream->current_tracefile_seq));
878c34cf 1257 /* ret == 0 means successful so we continue. */
7591bab1
MD
1258 ret = 0;
1259 } else {
1260 /* Error reading index. */
1261 ret = -1;
878c34cf 1262 }
878c34cf 1263 }
7591bab1 1264end:
878c34cf
DG
1265 return ret;
1266
1267hup:
7591bab1 1268 viewer_stream_put(vstream);
878c34cf
DG
1269index_ready:
1270 return 1;
1271}
1272
d3e2ba59
JD
1273/*
1274 * Send the next index for a stream.
1275 *
1276 * Return 0 on success or else a negative value.
1277 */
1278static
58eb9381 1279int viewer_get_next_index(struct relay_connection *conn)
d3e2ba59
JD
1280{
1281 int ret;
878c34cf 1282 ssize_t read_ret;
d3e2ba59
JD
1283 struct lttng_viewer_get_next_index request_index;
1284 struct lttng_viewer_index viewer_index;
50adc264 1285 struct ctf_packet_index packet_index;
7591bab1
MD
1286 struct relay_viewer_stream *vstream = NULL;
1287 struct relay_stream *rstream = NULL;
1288 struct ctf_trace *ctf_trace = NULL;
1289 struct relay_viewer_stream *metadata_viewer_stream = NULL;
d3e2ba59 1290
58eb9381 1291 assert(conn);
d3e2ba59
JD
1292
1293 DBG("Viewer get next index");
1294
7591bab1 1295 memset(&viewer_index, 0, sizeof(viewer_index));
eea7556c 1296 health_code_update();
2f8f53af 1297
58eb9381 1298 ret = recv_request(conn->sock, &request_index, sizeof(request_index));
2f8f53af 1299 if (ret < 0) {
d3e2ba59
JD
1300 goto end;
1301 }
eea7556c 1302 health_code_update();
d3e2ba59 1303
7591bab1 1304 vstream = viewer_stream_get_by_id(be64toh(request_index.stream_id));
6763619c 1305 if (!vstream) {
f1883937
MD
1306 viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR);
1307 goto send_reply;
2a174661
DG
1308 }
1309
7591bab1
MD
1310 /* Use back. ref. Protected by refcounts. */
1311 rstream = vstream->stream;
1312 ctf_trace = rstream->trace;
d3e2ba59 1313
7591bab1
MD
1314 /* metadata_viewer_stream may be NULL. */
1315 metadata_viewer_stream =
1316 ctf_trace_get_viewer_metadata_stream(ctf_trace);
2a174661 1317
7591bab1 1318 pthread_mutex_lock(&rstream->lock);
d3e2ba59
JD
1319
1320 /*
1321 * The viewer should not ask for index on metadata stream.
1322 */
7591bab1 1323 if (rstream->is_metadata) {
c4e361a4 1324 viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_HUP);
d3e2ba59
JD
1325 goto send_reply;
1326 }
1327
878c34cf
DG
1328 /* Try to open an index if one is needed for that stream. */
1329 ret = try_open_index(vstream, rstream);
1330 if (ret < 0) {
0e6830aa 1331 if (ret == -ENOENT) {
d3e2ba59 1332 /*
7591bab1
MD
1333 * The index is created only when the first data
1334 * packet arrives, it might not be ready at the
1335 * beginning of the session
d3e2ba59 1336 */
c4e361a4 1337 viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_RETRY);
878c34cf
DG
1338 } else {
1339 /* Unhandled error. */
c4e361a4 1340 viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR);
d3e2ba59 1341 }
878c34cf 1342 goto send_reply;
d3e2ba59
JD
1343 }
1344
878c34cf 1345 ret = check_index_status(vstream, rstream, ctf_trace, &viewer_index);
878c34cf 1346 if (ret < 0) {
7591bab1 1347 goto error_put;
878c34cf
DG
1348 } else if (ret == 1) {
1349 /*
7591bab1
MD
1350 * We have no index to send and check_index_status has populated
1351 * viewer_index's status.
878c34cf 1352 */
d3e2ba59
JD
1353 goto send_reply;
1354 }
7591bab1 1355 /* At this point, ret is 0 thus we will be able to read the index. */
878c34cf 1356 assert(!ret);
d3e2ba59 1357
7591bab1
MD
1358 /*
1359 * vstream->stream_fd may be NULL if it has been closed by
1360 * tracefile rotation, or if we are at the beginning of the
1361 * stream. We open the data stream file here to protect against
1362 * overwrite caused by tracefile rotation (in association with
1363 * unlink performed before overwrite).
1364 */
1365 if (!vstream->stream_fd) {
1366 char fullpath[PATH_MAX];
1367
1368 if (vstream->stream->tracefile_count > 0) {
1369 ret = snprintf(fullpath, PATH_MAX, "%s/%s_%" PRIu64,
1370 vstream->path_name,
1371 vstream->channel_name,
1372 vstream->current_tracefile_id);
1373 } else {
1374 ret = snprintf(fullpath, PATH_MAX, "%s/%s",
1375 vstream->path_name,
1376 vstream->channel_name);
1377 }
1378 if (ret < 0) {
1379 goto error_put;
1380 }
1381 ret = open(fullpath, O_RDONLY);
1382 if (ret < 0) {
1383 PERROR("Relay opening trace file");
1384 goto error_put;
1385 }
1386 vstream->stream_fd = stream_fd_create(ret);
1387 if (!vstream->stream_fd) {
1388 if (close(ret)) {
1389 PERROR("close");
1390 }
1391 goto error_put;
1392 }
d3e2ba59
JD
1393 }
1394
f04a971b 1395 ret = check_new_streams(conn);
4a9daf17 1396 if (ret < 0) {
7591bab1
MD
1397 viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR);
1398 goto send_reply;
4a9daf17
JD
1399 } else if (ret == 1) {
1400 viewer_index.flags |= LTTNG_VIEWER_FLAG_NEW_STREAM;
1401 }
1402
7591bab1 1403 read_ret = lttng_read(vstream->index_fd->fd, &packet_index,
6cd525e8 1404 sizeof(packet_index));
7591bab1
MD
1405 if (read_ret < sizeof(packet_index)) {
1406 ERR("Relay reading index file %d returned %zd",
1407 vstream->index_fd->fd, read_ret);
1408 viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR);
6b6b9a5a 1409 goto send_reply;
d3e2ba59 1410 } else {
c4e361a4 1411 viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_OK);
d3e2ba59
JD
1412 vstream->last_sent_index++;
1413 }
1414
1415 /*
1416 * Indexes are stored in big endian, no need to switch before sending.
1417 */
7591bab1
MD
1418 DBG("Sending viewer index for stream %" PRIu64 " offset %" PRIu64,
1419 rstream->stream_handle,
1420 be64toh(packet_index.offset));
d3e2ba59
JD
1421 viewer_index.offset = packet_index.offset;
1422 viewer_index.packet_size = packet_index.packet_size;
1423 viewer_index.content_size = packet_index.content_size;
1424 viewer_index.timestamp_begin = packet_index.timestamp_begin;
1425 viewer_index.timestamp_end = packet_index.timestamp_end;
1426 viewer_index.events_discarded = packet_index.events_discarded;
1427 viewer_index.stream_id = packet_index.stream_id;
1428
1429send_reply:
f1883937
MD
1430 if (rstream) {
1431 pthread_mutex_unlock(&rstream->lock);
1432 }
7591bab1
MD
1433
1434 if (metadata_viewer_stream) {
1435 pthread_mutex_lock(&metadata_viewer_stream->stream->lock);
1436 DBG("get next index metadata check: recv %" PRIu64
1437 " sent %" PRIu64,
1438 metadata_viewer_stream->stream->metadata_received,
1439 metadata_viewer_stream->metadata_sent);
1440 if (!metadata_viewer_stream->stream->metadata_received ||
1441 metadata_viewer_stream->stream->metadata_received >
1442 metadata_viewer_stream->metadata_sent) {
1443 viewer_index.flags |= LTTNG_VIEWER_FLAG_NEW_METADATA;
1444 }
1445 pthread_mutex_unlock(&metadata_viewer_stream->stream->lock);
1446 }
1447
d3e2ba59 1448 viewer_index.flags = htobe32(viewer_index.flags);
eea7556c 1449 health_code_update();
2f8f53af 1450
58eb9381 1451 ret = send_response(conn->sock, &viewer_index, sizeof(viewer_index));
d3e2ba59 1452 if (ret < 0) {
7591bab1 1453 goto end;
d3e2ba59 1454 }
eea7556c 1455 health_code_update();
d3e2ba59 1456
9237e6a1
MD
1457 if (vstream) {
1458 DBG("Index %" PRIu64 " for stream %" PRIu64 " sent",
1459 vstream->last_sent_index,
1460 vstream->stream->stream_handle);
1461 }
d3e2ba59 1462end:
7591bab1
MD
1463 if (metadata_viewer_stream) {
1464 viewer_stream_put(metadata_viewer_stream);
1465 }
1466 if (vstream) {
1467 viewer_stream_put(vstream);
1468 }
1469 return ret;
1470
1471error_put:
1472 pthread_mutex_unlock(&rstream->lock);
1473 if (metadata_viewer_stream) {
1474 viewer_stream_put(metadata_viewer_stream);
1475 }
1476 viewer_stream_put(vstream);
d3e2ba59
JD
1477 return ret;
1478}
1479
1480/*
1481 * Send the next index for a stream
1482 *
1483 * Return 0 on success or else a negative value.
1484 */
1485static
58eb9381 1486int viewer_get_packet(struct relay_connection *conn)
d3e2ba59
JD
1487{
1488 int ret, send_data = 0;
1489 char *data = NULL;
1490 uint32_t len = 0;
1491 ssize_t read_len;
1492 struct lttng_viewer_get_packet get_packet_info;
1493 struct lttng_viewer_trace_packet reply;
7591bab1 1494 struct relay_viewer_stream *vstream = NULL;
d3e2ba59
JD
1495
1496 DBG2("Relay get data packet");
1497
eea7556c 1498 health_code_update();
2f8f53af 1499
7591bab1
MD
1500 ret = recv_request(conn->sock, &get_packet_info,
1501 sizeof(get_packet_info));
2f8f53af 1502 if (ret < 0) {
d3e2ba59
JD
1503 goto end;
1504 }
eea7556c 1505 health_code_update();
d3e2ba59 1506
0233a6a5
DG
1507 /* From this point on, the error label can be reached. */
1508 memset(&reply, 0, sizeof(reply));
1509
7591bab1
MD
1510 vstream = viewer_stream_get_by_id(be64toh(get_packet_info.stream_id));
1511 if (!vstream) {
ba014812
MD
1512 reply.status = htobe32(LTTNG_VIEWER_GET_PACKET_ERR);
1513 goto send_reply_nolock;
d3e2ba59 1514 }
2a174661 1515
7591bab1 1516 pthread_mutex_lock(&vstream->stream->lock);
4a9daf17 1517
d3e2ba59
JD
1518 len = be32toh(get_packet_info.len);
1519 data = zmalloc(len);
1520 if (!data) {
1521 PERROR("relay data zmalloc");
1522 goto error;
1523 }
1524
7591bab1
MD
1525 ret = lseek(vstream->stream_fd->fd, be64toh(get_packet_info.offset),
1526 SEEK_SET);
d3e2ba59 1527 if (ret < 0) {
7591bab1
MD
1528 PERROR("lseek fd %d to offset %" PRIu64, vstream->stream_fd->fd,
1529 be64toh(get_packet_info.offset));
1530 goto error;
d3e2ba59 1531 }
7591bab1 1532 read_len = lttng_read(vstream->stream_fd->fd, data, len);
6cd525e8 1533 if (read_len < len) {
7591bab1
MD
1534 PERROR("Relay reading trace file, fd: %d, offset: %" PRIu64,
1535 vstream->stream_fd->fd,
1536 be64toh(get_packet_info.offset));
1537 goto error;
d3e2ba59 1538 }
c4e361a4 1539 reply.status = htobe32(LTTNG_VIEWER_GET_PACKET_OK);
d3e2ba59
JD
1540 reply.len = htobe32(len);
1541 send_data = 1;
1542 goto send_reply;
1543
1544error:
c4e361a4 1545 reply.status = htobe32(LTTNG_VIEWER_GET_PACKET_ERR);
d3e2ba59
JD
1546
1547send_reply:
7591bab1
MD
1548 if (vstream) {
1549 pthread_mutex_unlock(&vstream->stream->lock);
1550 }
1551send_reply_nolock:
d3e2ba59 1552 reply.flags = htobe32(reply.flags);
eea7556c
MD
1553
1554 health_code_update();
2f8f53af 1555
58eb9381 1556 ret = send_response(conn->sock, &reply, sizeof(reply));
d3e2ba59 1557 if (ret < 0) {
7591bab1 1558 goto end_free;
d3e2ba59 1559 }
eea7556c 1560 health_code_update();
d3e2ba59
JD
1561
1562 if (send_data) {
eea7556c 1563 health_code_update();
58eb9381 1564 ret = send_response(conn->sock, data, len);
d3e2ba59 1565 if (ret < 0) {
7591bab1 1566 goto end_free;
d3e2ba59 1567 }
eea7556c 1568 health_code_update();
d3e2ba59
JD
1569 }
1570
1571 DBG("Sent %u bytes for stream %" PRIu64, len,
1572 be64toh(get_packet_info.stream_id));
1573
7591bab1 1574end_free:
d3e2ba59 1575 free(data);
d3e2ba59 1576end:
7591bab1
MD
1577 if (vstream) {
1578 viewer_stream_put(vstream);
1579 }
d3e2ba59
JD
1580 return ret;
1581}
1582
1583/*
1584 * Send the session's metadata
1585 *
1586 * Return 0 on success else a negative value.
1587 */
1588static
58eb9381 1589int viewer_get_metadata(struct relay_connection *conn)
d3e2ba59
JD
1590{
1591 int ret = 0;
1592 ssize_t read_len;
1593 uint64_t len = 0;
1594 char *data = NULL;
1595 struct lttng_viewer_get_metadata request;
1596 struct lttng_viewer_metadata_packet reply;
7591bab1 1597 struct relay_viewer_stream *vstream = NULL;
d3e2ba59 1598
58eb9381 1599 assert(conn);
d3e2ba59
JD
1600
1601 DBG("Relay get metadata");
1602
eea7556c 1603 health_code_update();
2f8f53af 1604
58eb9381 1605 ret = recv_request(conn->sock, &request, sizeof(request));
2f8f53af 1606 if (ret < 0) {
d3e2ba59
JD
1607 goto end;
1608 }
eea7556c 1609 health_code_update();
d3e2ba59 1610
53efb85a
MD
1611 memset(&reply, 0, sizeof(reply));
1612
7591bab1
MD
1613 vstream = viewer_stream_get_by_id(be64toh(request.stream_id));
1614 if (!vstream) {
3b463131
MD
1615 /*
1616 * The metadata stream can be closed by a CLOSE command
1617 * just before we attach. It can also be closed by
1618 * per-pid tracing during tracing. Therefore, it is
1619 * possible that we cannot find this viewer stream.
1620 * Reply back to the client with an error if we cannot
1621 * find it.
1622 */
1623 reply.status = htobe32(LTTNG_VIEWER_METADATA_ERR);
7591bab1 1624 goto send_reply;
d3e2ba59 1625 }
7591bab1
MD
1626 pthread_mutex_lock(&vstream->stream->lock);
1627 if (!vstream->stream->is_metadata) {
1628 ERR("Invalid metadata stream");
6763619c
JD
1629 goto error;
1630 }
1631
7591bab1 1632 assert(vstream->metadata_sent <= vstream->stream->metadata_received);
2a174661 1633
7591bab1 1634 len = vstream->stream->metadata_received - vstream->metadata_sent;
d3e2ba59 1635 if (len == 0) {
c4e361a4 1636 reply.status = htobe32(LTTNG_VIEWER_NO_NEW_METADATA);
d3e2ba59
JD
1637 goto send_reply;
1638 }
1639
1640 /* first time, we open the metadata file */
7591bab1 1641 if (!vstream->stream_fd) {
d3e2ba59
JD
1642 char fullpath[PATH_MAX];
1643
7591bab1
MD
1644 ret = snprintf(fullpath, PATH_MAX, "%s/%s", vstream->path_name,
1645 vstream->channel_name);
d3e2ba59
JD
1646 if (ret < 0) {
1647 goto error;
1648 }
1649 ret = open(fullpath, O_RDONLY);
1650 if (ret < 0) {
1651 PERROR("Relay opening metadata file");
1652 goto error;
1653 }
7591bab1
MD
1654 vstream->stream_fd = stream_fd_create(ret);
1655 if (!vstream->stream_fd) {
1656 if (close(ret)) {
1657 PERROR("close");
1658 }
1659 goto error;
1660 }
d3e2ba59
JD
1661 }
1662
1663 reply.len = htobe64(len);
1664 data = zmalloc(len);
1665 if (!data) {
1666 PERROR("viewer metadata zmalloc");
1667 goto error;
1668 }
1669
7591bab1 1670 read_len = lttng_read(vstream->stream_fd->fd, data, len);
6cd525e8 1671 if (read_len < len) {
d3e2ba59
JD
1672 PERROR("Relay reading metadata file");
1673 goto error;
1674 }
7591bab1
MD
1675 vstream->metadata_sent += read_len;
1676 if (vstream->metadata_sent == vstream->stream->metadata_received
1677 && vstream->stream->closed) {
1678 /* Release ownership for the viewer metadata stream. */
1679 viewer_stream_put(vstream);
1680 }
1681
c4e361a4 1682 reply.status = htobe32(LTTNG_VIEWER_METADATA_OK);
7591bab1 1683
d3e2ba59
JD
1684 goto send_reply;
1685
1686error:
c4e361a4 1687 reply.status = htobe32(LTTNG_VIEWER_METADATA_ERR);
d3e2ba59
JD
1688
1689send_reply:
eea7556c 1690 health_code_update();
7591bab1
MD
1691 if (vstream) {
1692 pthread_mutex_unlock(&vstream->stream->lock);
1693 }
58eb9381 1694 ret = send_response(conn->sock, &reply, sizeof(reply));
d3e2ba59 1695 if (ret < 0) {
7591bab1 1696 goto end_free;
d3e2ba59 1697 }
eea7556c 1698 health_code_update();
d3e2ba59
JD
1699
1700 if (len > 0) {
58eb9381 1701 ret = send_response(conn->sock, data, len);
d3e2ba59 1702 if (ret < 0) {
7591bab1 1703 goto end_free;
d3e2ba59
JD
1704 }
1705 }
1706
1707 DBG("Sent %" PRIu64 " bytes of metadata for stream %" PRIu64, len,
1708 be64toh(request.stream_id));
1709
1710 DBG("Metadata sent");
1711
7591bab1 1712end_free:
d3e2ba59 1713 free(data);
d3e2ba59 1714end:
7591bab1
MD
1715 if (vstream) {
1716 viewer_stream_put(vstream);
1717 }
d3e2ba59
JD
1718 return ret;
1719}
1720
c3b7390b
JD
1721/*
1722 * Create a viewer session.
1723 *
1724 * Return 0 on success or else a negative value.
1725 */
1726static
1727int viewer_create_session(struct relay_connection *conn)
1728{
1729 int ret;
1730 struct lttng_viewer_create_session_response resp;
1731
1732 DBG("Viewer create session received");
1733
53efb85a 1734 memset(&resp, 0, sizeof(resp));
c3b7390b 1735 resp.status = htobe32(LTTNG_VIEWER_CREATE_SESSION_OK);
7591bab1 1736 conn->viewer_session = viewer_session_create();
c3b7390b
JD
1737 if (!conn->viewer_session) {
1738 ERR("Allocation viewer session");
1739 resp.status = htobe32(LTTNG_VIEWER_CREATE_SESSION_ERR);
1740 goto send_reply;
1741 }
c3b7390b
JD
1742
1743send_reply:
1744 health_code_update();
1745 ret = send_response(conn->sock, &resp, sizeof(resp));
1746 if (ret < 0) {
1747 goto end;
1748 }
1749 health_code_update();
1750 ret = 0;
1751
1752end:
1753 return ret;
1754}
1755
1756
d3e2ba59
JD
1757/*
1758 * live_relay_unknown_command: send -1 if received unknown command
1759 */
1760static
58eb9381 1761void live_relay_unknown_command(struct relay_connection *conn)
d3e2ba59
JD
1762{
1763 struct lttcomm_relayd_generic_reply reply;
d3e2ba59 1764
53efb85a 1765 memset(&reply, 0, sizeof(reply));
d3e2ba59 1766 reply.ret_code = htobe32(LTTNG_ERR_UNK);
58eb9381 1767 (void) send_response(conn->sock, &reply, sizeof(reply));
d3e2ba59
JD
1768}
1769
1770/*
1771 * Process the commands received on the control socket
1772 */
1773static
1774int process_control(struct lttng_viewer_cmd *recv_hdr,
58eb9381 1775 struct relay_connection *conn)
d3e2ba59
JD
1776{
1777 int ret = 0;
2f8f53af
DG
1778 uint32_t msg_value;
1779
2f8f53af
DG
1780 msg_value = be32toh(recv_hdr->cmd);
1781
1782 /*
1783 * Make sure we've done the version check before any command other then a
1784 * new client connection.
1785 */
c4e361a4 1786 if (msg_value != LTTNG_VIEWER_CONNECT && !conn->version_check_done) {
58eb9381 1787 ERR("Viewer conn value %" PRIu32 " before version check", msg_value);
2f8f53af
DG
1788 ret = -1;
1789 goto end;
1790 }
d3e2ba59 1791
2f8f53af 1792 switch (msg_value) {
c4e361a4 1793 case LTTNG_VIEWER_CONNECT:
58eb9381 1794 ret = viewer_connect(conn);
d3e2ba59 1795 break;
c4e361a4 1796 case LTTNG_VIEWER_LIST_SESSIONS:
58eb9381 1797 ret = viewer_list_sessions(conn);
d3e2ba59 1798 break;
c4e361a4 1799 case LTTNG_VIEWER_ATTACH_SESSION:
58eb9381 1800 ret = viewer_attach_session(conn);
d3e2ba59 1801 break;
c4e361a4 1802 case LTTNG_VIEWER_GET_NEXT_INDEX:
58eb9381 1803 ret = viewer_get_next_index(conn);
d3e2ba59 1804 break;
c4e361a4 1805 case LTTNG_VIEWER_GET_PACKET:
58eb9381 1806 ret = viewer_get_packet(conn);
d3e2ba59 1807 break;
c4e361a4 1808 case LTTNG_VIEWER_GET_METADATA:
58eb9381 1809 ret = viewer_get_metadata(conn);
d3e2ba59 1810 break;
c4e361a4 1811 case LTTNG_VIEWER_GET_NEW_STREAMS:
58eb9381 1812 ret = viewer_get_new_streams(conn);
80e8027a 1813 break;
c3b7390b
JD
1814 case LTTNG_VIEWER_CREATE_SESSION:
1815 ret = viewer_create_session(conn);
1816 break;
d3e2ba59 1817 default:
7591bab1
MD
1818 ERR("Received unknown viewer command (%u)",
1819 be32toh(recv_hdr->cmd));
58eb9381 1820 live_relay_unknown_command(conn);
d3e2ba59
JD
1821 ret = -1;
1822 goto end;
1823 }
1824
1825end:
1826 return ret;
1827}
1828
1829static
58eb9381 1830void cleanup_connection_pollfd(struct lttng_poll_event *events, int pollfd)
d3e2ba59
JD
1831{
1832 int ret;
1833
58eb9381 1834 (void) lttng_poll_del(events, pollfd);
d3e2ba59
JD
1835
1836 ret = close(pollfd);
1837 if (ret < 0) {
1838 ERR("Closing pollfd %d", pollfd);
1839 }
1840}
1841
d3e2ba59
JD
1842/*
1843 * This thread does the actual work
1844 */
1845static
1846void *thread_worker(void *data)
1847{
1848 int ret, err = -1;
1849 uint32_t nb_fd;
d3e2ba59 1850 struct lttng_poll_event events;
7591bab1 1851 struct lttng_ht *viewer_connections_ht;
d3e2ba59
JD
1852 struct lttng_ht_iter iter;
1853 struct lttng_viewer_cmd recv_hdr;
302d8906 1854 struct relay_connection *destroy_conn;
d3e2ba59
JD
1855
1856 DBG("[thread] Live viewer relay worker started");
1857
1858 rcu_register_thread();
1859
eea7556c
MD
1860 health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_WORKER);
1861
9b5e0863
MD
1862 if (testpoint(relayd_thread_live_worker)) {
1863 goto error_testpoint;
1864 }
1865
d3e2ba59 1866 /* table of connections indexed on socket */
7591bab1
MD
1867 viewer_connections_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
1868 if (!viewer_connections_ht) {
1869 goto viewer_connections_ht_error;
d3e2ba59
JD
1870 }
1871
1872 ret = create_thread_poll_set(&events, 2);
1873 if (ret < 0) {
1874 goto error_poll_create;
1875 }
1876
58eb9381 1877 ret = lttng_poll_add(&events, live_conn_pipe[0], LPOLLIN | LPOLLRDHUP);
d3e2ba59
JD
1878 if (ret < 0) {
1879 goto error;
1880 }
1881
1882restart:
1883 while (1) {
1884 int i;
1885
eea7556c
MD
1886 health_code_update();
1887
d3e2ba59
JD
1888 /* Infinite blocking call, waiting for transmission */
1889 DBG3("Relayd live viewer worker thread polling...");
eea7556c 1890 health_poll_entry();
d3e2ba59 1891 ret = lttng_poll_wait(&events, -1);
eea7556c 1892 health_poll_exit();
d3e2ba59
JD
1893 if (ret < 0) {
1894 /*
1895 * Restart interrupted system call.
1896 */
1897 if (errno == EINTR) {
1898 goto restart;
1899 }
1900 goto error;
1901 }
1902
1903 nb_fd = ret;
1904
1905 /*
1906 * Process control. The control connection is prioritised so we don't
1907 * starve it with high throughput tracing data on the data
1908 * connection.
1909 */
1910 for (i = 0; i < nb_fd; i++) {
1911 /* Fetch once the poll data */
1912 uint32_t revents = LTTNG_POLL_GETEV(&events, i);
1913 int pollfd = LTTNG_POLL_GETFD(&events, i);
1914
eea7556c
MD
1915 health_code_update();
1916
fd20dac9
MD
1917 if (!revents) {
1918 /* No activity for this FD (poll implementation). */
1919 continue;
1920 }
1921
d3e2ba59 1922 /* Thread quit pipe has been closed. Killing thread. */
bcf4a440 1923 ret = check_thread_quit_pipe(pollfd, revents);
d3e2ba59
JD
1924 if (ret) {
1925 err = 0;
1926 goto exit;
1927 }
1928
7591bab1 1929 /* Inspect the relay conn pipe for new connection. */
58eb9381 1930 if (pollfd == live_conn_pipe[0]) {
d3e2ba59
JD
1931 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1932 ERR("Relay live pipe error");
1933 goto error;
1934 } else if (revents & LPOLLIN) {
302d8906
JG
1935 struct relay_connection *conn;
1936
7591bab1
MD
1937 ret = lttng_read(live_conn_pipe[0],
1938 &conn, sizeof(conn));
d3e2ba59
JD
1939 if (ret < 0) {
1940 goto error;
1941 }
58eb9381
DG
1942 lttng_poll_add(&events, conn->sock->fd,
1943 LPOLLIN | LPOLLRDHUP);
7591bab1
MD
1944 connection_ht_add(viewer_connections_ht, conn);
1945 DBG("Connection socket %d added to poll", conn->sock->fd);
d3e2ba59 1946 }
58eb9381 1947 } else {
7591bab1 1948 /* Connection activity. */
302d8906
JG
1949 struct relay_connection *conn;
1950
7591bab1
MD
1951 conn = connection_get_by_sock(viewer_connections_ht, pollfd);
1952 if (!conn) {
1953 continue;
1954 }
58eb9381
DG
1955
1956 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1957 cleanup_connection_pollfd(&events, pollfd);
7591bab1
MD
1958 /* Put "create" ownership reference. */
1959 connection_put(conn);
d3e2ba59 1960 } else if (revents & LPOLLIN) {
58eb9381
DG
1961 ret = conn->sock->ops->recvmsg(conn->sock, &recv_hdr,
1962 sizeof(recv_hdr), 0);
d3e2ba59 1963 if (ret <= 0) {
7591bab1 1964 /* Connection closed. */
58eb9381 1965 cleanup_connection_pollfd(&events, pollfd);
7591bab1
MD
1966 /* Put "create" ownership reference. */
1967 connection_put(conn);
58eb9381 1968 DBG("Viewer control conn closed with %d", pollfd);
d3e2ba59 1969 } else {
58eb9381 1970 ret = process_control(&recv_hdr, conn);
d3e2ba59
JD
1971 if (ret < 0) {
1972 /* Clear the session on error. */
58eb9381 1973 cleanup_connection_pollfd(&events, pollfd);
7591bab1
MD
1974 /* Put "create" ownership reference. */
1975 connection_put(conn);
d3e2ba59
JD
1976 DBG("Viewer connection closed with %d", pollfd);
1977 }
1978 }
1979 }
7591bab1
MD
1980 /* Put local "get_by_sock" reference. */
1981 connection_put(conn);
d3e2ba59
JD
1982 }
1983 }
1984 }
1985
1986exit:
1987error:
1988 lttng_poll_clean(&events);
1989
58eb9381 1990 /* Cleanup reamaining connection object. */
d3e2ba59 1991 rcu_read_lock();
7591bab1 1992 cds_lfht_for_each_entry(viewer_connections_ht->ht, &iter.iter,
302d8906 1993 destroy_conn,
58eb9381 1994 sock_n.node) {
eea7556c 1995 health_code_update();
7591bab1 1996 connection_put(destroy_conn);
d3e2ba59
JD
1997 }
1998 rcu_read_unlock();
1999error_poll_create:
7591bab1
MD
2000 lttng_ht_destroy(viewer_connections_ht);
2001viewer_connections_ht_error:
58eb9381
DG
2002 /* Close relay conn pipes */
2003 utils_close_pipe(live_conn_pipe);
d3e2ba59
JD
2004 if (err) {
2005 DBG("Viewer worker thread exited with error");
2006 }
2007 DBG("Viewer worker thread cleanup complete");
9b5e0863 2008error_testpoint:
eea7556c
MD
2009 if (err) {
2010 health_error();
2011 ERR("Health error occurred in %s", __func__);
2012 }
2013 health_unregister(health_relayd);
b4aacfdc
MD
2014 if (lttng_relay_stop_threads()) {
2015 ERR("Error stopping threads");
178a0557 2016 }
d3e2ba59
JD
2017 rcu_unregister_thread();
2018 return NULL;
2019}
2020
2021/*
2022 * Create the relay command pipe to wake thread_manage_apps.
2023 * Closed in cleanup().
2024 */
58eb9381 2025static int create_conn_pipe(void)
d3e2ba59 2026{
178a0557
MD
2027 return utils_create_pipe_cloexec(live_conn_pipe);
2028}
d3e2ba59 2029
178a0557 2030int relayd_live_join(void)
d3e2ba59 2031{
178a0557 2032 int ret, retval = 0;
d3e2ba59
JD
2033 void *status;
2034
d3e2ba59 2035 ret = pthread_join(live_listener_thread, &status);
178a0557
MD
2036 if (ret) {
2037 errno = ret;
d3e2ba59 2038 PERROR("pthread_join live listener");
178a0557 2039 retval = -1;
d3e2ba59
JD
2040 }
2041
2042 ret = pthread_join(live_worker_thread, &status);
178a0557
MD
2043 if (ret) {
2044 errno = ret;
d3e2ba59 2045 PERROR("pthread_join live worker");
178a0557 2046 retval = -1;
d3e2ba59
JD
2047 }
2048
2049 ret = pthread_join(live_dispatcher_thread, &status);
178a0557
MD
2050 if (ret) {
2051 errno = ret;
d3e2ba59 2052 PERROR("pthread_join live dispatcher");
178a0557 2053 retval = -1;
d3e2ba59
JD
2054 }
2055
178a0557 2056 cleanup_relayd_live();
d3e2ba59 2057
178a0557 2058 return retval;
d3e2ba59
JD
2059}
2060
2061/*
2062 * main
2063 */
7591bab1 2064int relayd_live_create(struct lttng_uri *uri)
d3e2ba59 2065{
178a0557 2066 int ret = 0, retval = 0;
d3e2ba59
JD
2067 void *status;
2068 int is_root;
2069
178a0557
MD
2070 if (!uri) {
2071 retval = -1;
2072 goto exit_init_data;
2073 }
d3e2ba59
JD
2074 live_uri = uri;
2075
d3e2ba59
JD
2076 /* Check if daemon is UID = 0 */
2077 is_root = !getuid();
2078
2079 if (!is_root) {
2080 if (live_uri->port < 1024) {
2081 ERR("Need to be root to use ports < 1024");
178a0557
MD
2082 retval = -1;
2083 goto exit_init_data;
d3e2ba59
JD
2084 }
2085 }
2086
2087 /* Setup the thread apps communication pipe. */
178a0557
MD
2088 if (create_conn_pipe()) {
2089 retval = -1;
2090 goto exit_init_data;
d3e2ba59
JD
2091 }
2092
2093 /* Init relay command queue. */
8bdee6e2 2094 cds_wfcq_init(&viewer_conn_queue.head, &viewer_conn_queue.tail);
d3e2ba59
JD
2095
2096 /* Set up max poll set size */
25b397f9
MD
2097 if (lttng_poll_set_max_size()) {
2098 retval = -1;
2099 goto exit_init_data;
2100 }
d3e2ba59
JD
2101
2102 /* Setup the dispatcher thread */
2103 ret = pthread_create(&live_dispatcher_thread, NULL,
2104 thread_dispatcher, (void *) NULL);
178a0557
MD
2105 if (ret) {
2106 errno = ret;
d3e2ba59 2107 PERROR("pthread_create viewer dispatcher");
178a0557
MD
2108 retval = -1;
2109 goto exit_dispatcher_thread;
d3e2ba59
JD
2110 }
2111
2112 /* Setup the worker thread */
2113 ret = pthread_create(&live_worker_thread, NULL,
7591bab1 2114 thread_worker, NULL);
178a0557
MD
2115 if (ret) {
2116 errno = ret;
d3e2ba59 2117 PERROR("pthread_create viewer worker");
178a0557
MD
2118 retval = -1;
2119 goto exit_worker_thread;
d3e2ba59
JD
2120 }
2121
2122 /* Setup the listener thread */
2123 ret = pthread_create(&live_listener_thread, NULL,
2124 thread_listener, (void *) NULL);
178a0557
MD
2125 if (ret) {
2126 errno = ret;
d3e2ba59 2127 PERROR("pthread_create viewer listener");
178a0557
MD
2128 retval = -1;
2129 goto exit_listener_thread;
d3e2ba59
JD
2130 }
2131
178a0557
MD
2132 /*
2133 * All OK, started all threads.
2134 */
2135 return retval;
2136
9911d21b
JG
2137 /*
2138 * Join on the live_listener_thread should anything be added after
2139 * the live_listener thread's creation.
2140 */
d3e2ba59 2141
178a0557 2142exit_listener_thread:
d3e2ba59 2143
d3e2ba59 2144 ret = pthread_join(live_worker_thread, &status);
178a0557
MD
2145 if (ret) {
2146 errno = ret;
d3e2ba59 2147 PERROR("pthread_join live worker");
178a0557 2148 retval = -1;
d3e2ba59 2149 }
178a0557 2150exit_worker_thread:
d3e2ba59 2151
d3e2ba59 2152 ret = pthread_join(live_dispatcher_thread, &status);
178a0557
MD
2153 if (ret) {
2154 errno = ret;
d3e2ba59 2155 PERROR("pthread_join live dispatcher");
178a0557 2156 retval = -1;
d3e2ba59 2157 }
178a0557 2158exit_dispatcher_thread:
d3e2ba59 2159
178a0557
MD
2160exit_init_data:
2161 cleanup_relayd_live();
d3e2ba59 2162
178a0557 2163 return retval;
d3e2ba59 2164}
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