Commit | Line | Data |
---|---|---|
d3e2ba59 JD |
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 | ||
6c1c0768 | 20 | #define _LGPL_SOURCE |
d3e2ba59 JD |
21 | #include <getopt.h> |
22 | #include <grp.h> | |
23 | #include <limits.h> | |
24 | #include <pthread.h> | |
25 | #include <signal.h> | |
26 | #include <stdio.h> | |
27 | #include <stdlib.h> | |
28 | #include <string.h> | |
29 | #include <sys/mman.h> | |
30 | #include <sys/mount.h> | |
31 | #include <sys/resource.h> | |
32 | #include <sys/socket.h> | |
33 | #include <sys/stat.h> | |
34 | #include <sys/types.h> | |
35 | #include <sys/wait.h> | |
36 | #include <inttypes.h> | |
37 | #include <urcu/futex.h> | |
38 | #include <urcu/uatomic.h> | |
7591bab1 | 39 | #include <urcu/rculist.h> |
d3e2ba59 JD |
40 | #include <unistd.h> |
41 | #include <fcntl.h> | |
d3e2ba59 JD |
42 | |
43 | #include <lttng/lttng.h> | |
44 | #include <common/common.h> | |
45 | #include <common/compat/poll.h> | |
46 | #include <common/compat/socket.h> | |
f263b7fd | 47 | #include <common/compat/endian.h> |
d3e2ba59 JD |
48 | #include <common/defaults.h> |
49 | #include <common/futex.h> | |
2f8f53af | 50 | #include <common/index/index.h> |
d3e2ba59 JD |
51 | #include <common/sessiond-comm/sessiond-comm.h> |
52 | #include <common/sessiond-comm/inet.h> | |
53 | #include <common/sessiond-comm/relayd.h> | |
54 | #include <common/uri.h> | |
55 | #include <common/utils.h> | |
56 | ||
57 | #include "cmd.h" | |
58 | #include "live.h" | |
59 | #include "lttng-relayd.h" | |
d3e2ba59 | 60 | #include "utils.h" |
eea7556c | 61 | #include "health-relayd.h" |
9b5e0863 | 62 | #include "testpoint.h" |
2f8f53af | 63 | #include "viewer-stream.h" |
2a174661 DG |
64 | #include "stream.h" |
65 | #include "session.h" | |
66 | #include "ctf-trace.h" | |
58eb9381 | 67 | #include "connection.h" |
7591bab1 MD |
68 | #include "viewer-session.h" |
69 | ||
70 | #define SESSION_BUF_DEFAULT_COUNT 16 | |
d3e2ba59 JD |
71 | |
72 | static struct lttng_uri *live_uri; | |
73 | ||
d3e2ba59 JD |
74 | /* |
75 | * This pipe is used to inform the worker thread that a command is queued and | |
76 | * ready to be processed. | |
77 | */ | |
58eb9381 | 78 | static int live_conn_pipe[2] = { -1, -1 }; |
d3e2ba59 JD |
79 | |
80 | /* Shared between threads */ | |
81 | static int live_dispatch_thread_exit; | |
82 | ||
83 | static pthread_t live_listener_thread; | |
84 | static pthread_t live_dispatcher_thread; | |
85 | static pthread_t live_worker_thread; | |
86 | ||
87 | /* | |
88 | * Relay command queue. | |
89 | * | |
90 | * The live_thread_listener and live_thread_dispatcher communicate with this | |
91 | * queue. | |
92 | */ | |
58eb9381 | 93 | static struct relay_conn_queue viewer_conn_queue; |
d3e2ba59 JD |
94 | |
95 | static uint64_t last_relay_viewer_session_id; | |
7591bab1 MD |
96 | static pthread_mutex_t last_relay_viewer_session_id_lock = |
97 | PTHREAD_MUTEX_INITIALIZER; | |
d3e2ba59 JD |
98 | |
99 | /* | |
100 | * Cleanup the daemon | |
101 | */ | |
102 | static | |
178a0557 | 103 | void cleanup_relayd_live(void) |
d3e2ba59 JD |
104 | { |
105 | DBG("Cleaning up"); | |
106 | ||
d3e2ba59 JD |
107 | free(live_uri); |
108 | } | |
109 | ||
2f8f53af DG |
110 | /* |
111 | * Receive a request buffer using a given socket, destination allocated buffer | |
112 | * of length size. | |
113 | * | |
114 | * Return the size of the received message or else a negative value on error | |
115 | * with errno being set by recvmsg() syscall. | |
116 | */ | |
117 | static | |
118 | ssize_t recv_request(struct lttcomm_sock *sock, void *buf, size_t size) | |
119 | { | |
120 | ssize_t ret; | |
121 | ||
2f8f53af DG |
122 | ret = sock->ops->recvmsg(sock, buf, size, 0); |
123 | if (ret < 0 || ret != size) { | |
124 | if (ret == 0) { | |
125 | /* Orderly shutdown. Not necessary to print an error. */ | |
126 | DBG("Socket %d did an orderly shutdown", sock->fd); | |
127 | } else { | |
128 | ERR("Relay failed to receive request."); | |
129 | } | |
130 | ret = -1; | |
131 | } | |
132 | ||
133 | return ret; | |
134 | } | |
135 | ||
136 | /* | |
137 | * Send a response buffer using a given socket, source allocated buffer of | |
138 | * length size. | |
139 | * | |
140 | * Return the size of the sent message or else a negative value on error with | |
141 | * errno being set by sendmsg() syscall. | |
142 | */ | |
143 | static | |
144 | ssize_t send_response(struct lttcomm_sock *sock, void *buf, size_t size) | |
145 | { | |
146 | ssize_t ret; | |
147 | ||
2f8f53af DG |
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 | } | |
7591bab1 MD |
173 | rcu_read_lock(); |
174 | cds_list_for_each_entry_rcu(session, | |
175 | &conn->viewer_session->session_list, | |
176 | viewer_session_node) { | |
177 | if (!session_get(session)) { | |
178 | continue; | |
179 | } | |
f04a971b JD |
180 | current_val = uatomic_cmpxchg(&session->new_streams, 1, 0); |
181 | ret = current_val; | |
7591bab1 | 182 | session_put(session); |
f04a971b JD |
183 | if (ret == 1) { |
184 | goto end; | |
185 | } | |
2f8f53af | 186 | } |
f04a971b | 187 | end: |
7591bab1 | 188 | rcu_read_unlock(); |
2f8f53af DG |
189 | return ret; |
190 | } | |
191 | ||
192 | /* | |
193 | * Send viewer streams to the given socket. The ignore_sent_flag indicates if | |
194 | * this function should ignore the sent flag or not. | |
195 | * | |
196 | * Return 0 on success or else a negative value. | |
197 | */ | |
198 | static | |
199 | ssize_t send_viewer_streams(struct lttcomm_sock *sock, | |
200 | struct relay_session *session, unsigned int ignore_sent_flag) | |
201 | { | |
202 | ssize_t ret; | |
203 | struct lttng_viewer_stream send_stream; | |
204 | struct lttng_ht_iter iter; | |
205 | struct relay_viewer_stream *vstream; | |
206 | ||
2f8f53af DG |
207 | rcu_read_lock(); |
208 | ||
209 | cds_lfht_for_each_entry(viewer_streams_ht->ht, &iter.iter, vstream, | |
210 | stream_n.node) { | |
2a174661 DG |
211 | struct ctf_trace *ctf_trace; |
212 | ||
2f8f53af DG |
213 | health_code_update(); |
214 | ||
7591bab1 MD |
215 | if (!viewer_stream_get(vstream)) { |
216 | continue; | |
217 | } | |
218 | ||
219 | pthread_mutex_lock(&vstream->stream->lock); | |
2f8f53af | 220 | /* Ignore if not the same session. */ |
7591bab1 | 221 | if (vstream->stream->trace->session->id != session->id || |
2f8f53af | 222 | (!ignore_sent_flag && vstream->sent_flag)) { |
7591bab1 MD |
223 | pthread_mutex_unlock(&vstream->stream->lock); |
224 | viewer_stream_put(vstream); | |
2f8f53af DG |
225 | continue; |
226 | } | |
227 | ||
7591bab1 MD |
228 | ctf_trace = vstream->stream->trace; |
229 | send_stream.id = htobe64(vstream->stream->stream_handle); | |
2a174661 | 230 | send_stream.ctf_trace_id = htobe64(ctf_trace->id); |
7591bab1 MD |
231 | send_stream.metadata_flag = htobe32( |
232 | vstream->stream->is_metadata); | |
f8f011fb MD |
233 | if (lttng_strncpy(send_stream.path_name, vstream->path_name, |
234 | sizeof(send_stream.path_name))) { | |
235 | pthread_mutex_unlock(&vstream->stream->lock); | |
236 | viewer_stream_put(vstream); | |
237 | ret = -1; /* Error. */ | |
238 | goto end_unlock; | |
239 | } | |
240 | if (lttng_strncpy(send_stream.channel_name, | |
241 | vstream->channel_name, | |
242 | sizeof(send_stream.channel_name))) { | |
243 | pthread_mutex_unlock(&vstream->stream->lock); | |
244 | viewer_stream_put(vstream); | |
245 | ret = -1; /* Error. */ | |
246 | goto end_unlock; | |
247 | } | |
2f8f53af | 248 | |
7591bab1 MD |
249 | DBG("Sending stream %" PRIu64 " to viewer", |
250 | vstream->stream->stream_handle); | |
251 | vstream->sent_flag = 1; | |
252 | pthread_mutex_unlock(&vstream->stream->lock); | |
253 | ||
2f8f53af | 254 | ret = send_response(sock, &send_stream, sizeof(send_stream)); |
7591bab1 | 255 | viewer_stream_put(vstream); |
2f8f53af DG |
256 | if (ret < 0) { |
257 | goto end_unlock; | |
258 | } | |
2f8f53af DG |
259 | } |
260 | ||
261 | ret = 0; | |
262 | ||
263 | end_unlock: | |
264 | rcu_read_unlock(); | |
265 | return ret; | |
266 | } | |
267 | ||
268 | /* | |
269 | * Create every viewer stream possible for the given session with the seek | |
270 | * type. Three counters *can* be return which are in order the total amount of | |
271 | * viewer stream of the session, the number of unsent stream and the number of | |
272 | * stream created. Those counters can be NULL and thus will be ignored. | |
273 | * | |
274 | * Return 0 on success or else a negative value. | |
275 | */ | |
276 | static | |
277 | int make_viewer_streams(struct relay_session *session, | |
278 | enum lttng_viewer_seek seek_t, uint32_t *nb_total, uint32_t *nb_unsent, | |
bddf80e4 | 279 | uint32_t *nb_created, bool *closed) |
2f8f53af DG |
280 | { |
281 | int ret; | |
2f8f53af | 282 | struct lttng_ht_iter iter; |
2a174661 | 283 | struct ctf_trace *ctf_trace; |
2f8f53af DG |
284 | |
285 | assert(session); | |
286 | ||
287 | /* | |
7591bab1 MD |
288 | * Hold the session lock to ensure that we see either none or |
289 | * all initial streams for a session, but no intermediate state. | |
2f8f53af | 290 | */ |
7591bab1 | 291 | pthread_mutex_lock(&session->lock); |
2f8f53af | 292 | |
bddf80e4 MD |
293 | if (session->connection_closed) { |
294 | *closed = true; | |
295 | } | |
296 | ||
2f8f53af | 297 | /* |
7591bab1 MD |
298 | * Create viewer streams for relay streams that are ready to be |
299 | * used for a the given session id only. | |
2f8f53af | 300 | */ |
2a174661 DG |
301 | rcu_read_lock(); |
302 | cds_lfht_for_each_entry(session->ctf_traces_ht->ht, &iter.iter, ctf_trace, | |
303 | node.node) { | |
304 | struct relay_stream *stream; | |
2f8f53af DG |
305 | |
306 | health_code_update(); | |
307 | ||
7591bab1 | 308 | if (!ctf_trace_get(ctf_trace)) { |
2f8f53af DG |
309 | continue; |
310 | } | |
311 | ||
7591bab1 | 312 | cds_list_for_each_entry_rcu(stream, &ctf_trace->stream_list, stream_node) { |
2a174661 DG |
313 | struct relay_viewer_stream *vstream; |
314 | ||
7591bab1 | 315 | if (!stream_get(stream)) { |
2a174661 DG |
316 | continue; |
317 | } | |
7591bab1 | 318 | /* |
d812ecb9 | 319 | * stream published is protected by the session lock. |
7591bab1 MD |
320 | */ |
321 | if (!stream->published) { | |
322 | goto next; | |
323 | } | |
324 | vstream = viewer_stream_get_by_id(stream->stream_handle); | |
2f8f53af | 325 | if (!vstream) { |
7591bab1 | 326 | vstream = viewer_stream_create(stream, seek_t); |
2a174661 DG |
327 | if (!vstream) { |
328 | ret = -1; | |
7591bab1 MD |
329 | ctf_trace_put(ctf_trace); |
330 | stream_put(stream); | |
2a174661 DG |
331 | goto error_unlock; |
332 | } | |
2a174661 DG |
333 | |
334 | if (nb_created) { | |
335 | /* Update number of created stream counter. */ | |
336 | (*nb_created)++; | |
337 | } | |
2229a09c MD |
338 | /* |
339 | * Ensure a self-reference is preserved even | |
340 | * after we have put our local reference. | |
341 | */ | |
862d3a3b MD |
342 | if (!viewer_stream_get(vstream)) { |
343 | ERR("Unable to get self-reference on viewer stream, logic error."); | |
344 | abort(); | |
345 | } | |
7591bab1 MD |
346 | } else { |
347 | if (!vstream->sent_flag && nb_unsent) { | |
348 | /* Update number of unsent stream counter. */ | |
349 | (*nb_unsent)++; | |
350 | } | |
2f8f53af | 351 | } |
2a174661 DG |
352 | /* Update number of total stream counter. */ |
353 | if (nb_total) { | |
2229a09c MD |
354 | if (stream->is_metadata) { |
355 | if (!stream->closed || | |
356 | stream->metadata_received > vstream->metadata_sent) { | |
357 | (*nb_total)++; | |
358 | } | |
359 | } else { | |
360 | if (!stream->closed || | |
361 | !(((int64_t) (stream->prev_seq - stream->last_net_seq_num)) >= 0)) { | |
362 | ||
363 | (*nb_total)++; | |
364 | } | |
365 | } | |
2f8f53af | 366 | } |
2229a09c MD |
367 | /* Put local reference. */ |
368 | viewer_stream_put(vstream); | |
7591bab1 MD |
369 | next: |
370 | stream_put(stream); | |
2f8f53af | 371 | } |
7591bab1 | 372 | ctf_trace_put(ctf_trace); |
2f8f53af DG |
373 | } |
374 | ||
375 | ret = 0; | |
376 | ||
377 | error_unlock: | |
2a174661 | 378 | rcu_read_unlock(); |
7591bab1 | 379 | pthread_mutex_unlock(&session->lock); |
2f8f53af DG |
380 | return ret; |
381 | } | |
382 | ||
b4aacfdc | 383 | int relayd_live_stop(void) |
d3e2ba59 | 384 | { |
b4aacfdc | 385 | /* Stop dispatch thread */ |
d3e2ba59 | 386 | CMM_STORE_SHARED(live_dispatch_thread_exit, 1); |
58eb9381 | 387 | futex_nto1_wake(&viewer_conn_queue.futex); |
b4aacfdc | 388 | return 0; |
d3e2ba59 JD |
389 | } |
390 | ||
d3e2ba59 JD |
391 | /* |
392 | * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set. | |
393 | */ | |
394 | static | |
395 | int create_thread_poll_set(struct lttng_poll_event *events, int size) | |
396 | { | |
397 | int ret; | |
398 | ||
399 | if (events == NULL || size == 0) { | |
400 | ret = -1; | |
401 | goto error; | |
402 | } | |
403 | ||
404 | ret = lttng_poll_create(events, size, LTTNG_CLOEXEC); | |
405 | if (ret < 0) { | |
406 | goto error; | |
407 | } | |
408 | ||
409 | /* Add quit pipe */ | |
bcf4a440 | 410 | ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN | LPOLLERR); |
d3e2ba59 JD |
411 | if (ret < 0) { |
412 | goto error; | |
413 | } | |
414 | ||
415 | return 0; | |
416 | ||
417 | error: | |
418 | return ret; | |
419 | } | |
420 | ||
421 | /* | |
422 | * Check if the thread quit pipe was triggered. | |
423 | * | |
424 | * Return 1 if it was triggered else 0; | |
425 | */ | |
426 | static | |
bcf4a440 | 427 | int check_thread_quit_pipe(int fd, uint32_t events) |
d3e2ba59 | 428 | { |
bcf4a440 | 429 | if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) { |
d3e2ba59 JD |
430 | return 1; |
431 | } | |
432 | ||
433 | return 0; | |
434 | } | |
435 | ||
436 | /* | |
437 | * Create and init socket from uri. | |
438 | */ | |
439 | static | |
440 | struct lttcomm_sock *init_socket(struct lttng_uri *uri) | |
441 | { | |
442 | int ret; | |
443 | struct lttcomm_sock *sock = NULL; | |
444 | ||
445 | sock = lttcomm_alloc_sock_from_uri(uri); | |
446 | if (sock == NULL) { | |
447 | ERR("Allocating socket"); | |
448 | goto error; | |
449 | } | |
450 | ||
451 | ret = lttcomm_create_sock(sock); | |
452 | if (ret < 0) { | |
453 | goto error; | |
454 | } | |
455 | DBG("Listening on sock %d for live", sock->fd); | |
456 | ||
457 | ret = sock->ops->bind(sock); | |
458 | if (ret < 0) { | |
459 | goto error; | |
460 | } | |
461 | ||
462 | ret = sock->ops->listen(sock, -1); | |
463 | if (ret < 0) { | |
464 | goto error; | |
465 | ||
466 | } | |
467 | ||
468 | return sock; | |
469 | ||
470 | error: | |
471 | if (sock) { | |
472 | lttcomm_destroy_sock(sock); | |
473 | } | |
474 | return NULL; | |
475 | } | |
476 | ||
477 | /* | |
478 | * This thread manages the listening for new connections on the network | |
479 | */ | |
480 | static | |
481 | void *thread_listener(void *data) | |
482 | { | |
483 | int i, ret, pollfd, err = -1; | |
d3e2ba59 JD |
484 | uint32_t revents, nb_fd; |
485 | struct lttng_poll_event events; | |
486 | struct lttcomm_sock *live_control_sock; | |
487 | ||
488 | DBG("[thread] Relay live listener started"); | |
489 | ||
eea7556c MD |
490 | health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_LISTENER); |
491 | ||
492 | health_code_update(); | |
493 | ||
d3e2ba59 JD |
494 | live_control_sock = init_socket(live_uri); |
495 | if (!live_control_sock) { | |
496 | goto error_sock_control; | |
497 | } | |
498 | ||
fb4d42ab | 499 | /* Pass 2 as size here for the thread quit pipe and control sockets. */ |
d3e2ba59 JD |
500 | ret = create_thread_poll_set(&events, 2); |
501 | if (ret < 0) { | |
502 | goto error_create_poll; | |
503 | } | |
504 | ||
505 | /* Add the control socket */ | |
506 | ret = lttng_poll_add(&events, live_control_sock->fd, LPOLLIN | LPOLLRDHUP); | |
507 | if (ret < 0) { | |
508 | goto error_poll_add; | |
509 | } | |
510 | ||
3fd27398 MD |
511 | lttng_relay_notify_ready(); |
512 | ||
9b5e0863 MD |
513 | if (testpoint(relayd_thread_live_listener)) { |
514 | goto error_testpoint; | |
515 | } | |
516 | ||
d3e2ba59 | 517 | while (1) { |
eea7556c MD |
518 | health_code_update(); |
519 | ||
d3e2ba59 JD |
520 | DBG("Listener accepting live viewers connections"); |
521 | ||
522 | restart: | |
eea7556c | 523 | health_poll_entry(); |
d3e2ba59 | 524 | ret = lttng_poll_wait(&events, -1); |
eea7556c | 525 | health_poll_exit(); |
d3e2ba59 JD |
526 | if (ret < 0) { |
527 | /* | |
528 | * Restart interrupted system call. | |
529 | */ | |
530 | if (errno == EINTR) { | |
531 | goto restart; | |
532 | } | |
533 | goto error; | |
534 | } | |
535 | nb_fd = ret; | |
536 | ||
537 | DBG("Relay new viewer connection received"); | |
538 | for (i = 0; i < nb_fd; i++) { | |
eea7556c MD |
539 | health_code_update(); |
540 | ||
d3e2ba59 JD |
541 | /* Fetch once the poll data */ |
542 | revents = LTTNG_POLL_GETEV(&events, i); | |
543 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
544 | ||
fd20dac9 MD |
545 | if (!revents) { |
546 | /* No activity for this FD (poll implementation). */ | |
547 | continue; | |
548 | } | |
549 | ||
d3e2ba59 | 550 | /* Thread quit pipe has been closed. Killing thread. */ |
bcf4a440 | 551 | ret = check_thread_quit_pipe(pollfd, revents); |
d3e2ba59 JD |
552 | if (ret) { |
553 | err = 0; | |
554 | goto exit; | |
555 | } | |
556 | ||
03e43155 | 557 | if (revents & LPOLLIN) { |
d3e2ba59 | 558 | /* |
7591bab1 MD |
559 | * A new connection is requested, therefore a |
560 | * viewer connection is allocated in this | |
561 | * thread, enqueued to a global queue and | |
562 | * dequeued (and freed) in the worker thread. | |
d3e2ba59 | 563 | */ |
58eb9381 DG |
564 | int val = 1; |
565 | struct relay_connection *new_conn; | |
d3e2ba59 JD |
566 | struct lttcomm_sock *newsock; |
567 | ||
d3e2ba59 JD |
568 | newsock = live_control_sock->ops->accept(live_control_sock); |
569 | if (!newsock) { | |
570 | PERROR("accepting control sock"); | |
d3e2ba59 JD |
571 | goto error; |
572 | } | |
573 | DBG("Relay viewer connection accepted socket %d", newsock->fd); | |
58eb9381 | 574 | |
d3e2ba59 | 575 | ret = setsockopt(newsock->fd, SOL_SOCKET, SO_REUSEADDR, &val, |
58eb9381 | 576 | sizeof(val)); |
d3e2ba59 JD |
577 | if (ret < 0) { |
578 | PERROR("setsockopt inet"); | |
579 | lttcomm_destroy_sock(newsock); | |
d3e2ba59 JD |
580 | goto error; |
581 | } | |
7591bab1 MD |
582 | new_conn = connection_create(newsock, RELAY_CONNECTION_UNKNOWN); |
583 | if (!new_conn) { | |
584 | lttcomm_destroy_sock(newsock); | |
585 | goto error; | |
586 | } | |
587 | /* Ownership assumed by the connection. */ | |
588 | newsock = NULL; | |
d3e2ba59 | 589 | |
58eb9381 | 590 | /* Enqueue request for the dispatcher thread. */ |
8bdee6e2 SM |
591 | cds_wfcq_enqueue(&viewer_conn_queue.head, &viewer_conn_queue.tail, |
592 | &new_conn->qnode); | |
d3e2ba59 JD |
593 | |
594 | /* | |
7591bab1 MD |
595 | * Wake the dispatch queue futex. |
596 | * Implicit memory barrier with the | |
597 | * exchange in cds_wfcq_enqueue. | |
d3e2ba59 | 598 | */ |
58eb9381 | 599 | futex_nto1_wake(&viewer_conn_queue.futex); |
03e43155 MD |
600 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
601 | ERR("socket poll error"); | |
602 | goto error; | |
603 | } else { | |
604 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
605 | goto error; | |
d3e2ba59 JD |
606 | } |
607 | } | |
608 | } | |
609 | ||
610 | exit: | |
611 | error: | |
612 | error_poll_add: | |
9b5e0863 | 613 | error_testpoint: |
d3e2ba59 JD |
614 | lttng_poll_clean(&events); |
615 | error_create_poll: | |
616 | if (live_control_sock->fd >= 0) { | |
617 | ret = live_control_sock->ops->close(live_control_sock); | |
618 | if (ret) { | |
619 | PERROR("close"); | |
620 | } | |
621 | } | |
622 | lttcomm_destroy_sock(live_control_sock); | |
623 | error_sock_control: | |
624 | if (err) { | |
eea7556c | 625 | health_error(); |
d3e2ba59 JD |
626 | DBG("Live viewer listener thread exited with error"); |
627 | } | |
eea7556c | 628 | health_unregister(health_relayd); |
d3e2ba59 | 629 | DBG("Live viewer listener thread cleanup complete"); |
b4aacfdc MD |
630 | if (lttng_relay_stop_threads()) { |
631 | ERR("Error stopping threads"); | |
178a0557 | 632 | } |
d3e2ba59 JD |
633 | return NULL; |
634 | } | |
635 | ||
636 | /* | |
637 | * This thread manages the dispatching of the requests to worker threads | |
638 | */ | |
639 | static | |
640 | void *thread_dispatcher(void *data) | |
641 | { | |
6cd525e8 MD |
642 | int err = -1; |
643 | ssize_t ret; | |
8bdee6e2 | 644 | struct cds_wfcq_node *node; |
58eb9381 | 645 | struct relay_connection *conn = NULL; |
d3e2ba59 JD |
646 | |
647 | DBG("[thread] Live viewer relay dispatcher started"); | |
648 | ||
eea7556c MD |
649 | health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_DISPATCHER); |
650 | ||
9b5e0863 MD |
651 | if (testpoint(relayd_thread_live_dispatcher)) { |
652 | goto error_testpoint; | |
653 | } | |
654 | ||
eea7556c MD |
655 | health_code_update(); |
656 | ||
68924dc1 | 657 | for (;;) { |
eea7556c MD |
658 | health_code_update(); |
659 | ||
d3e2ba59 | 660 | /* Atomically prepare the queue futex */ |
58eb9381 | 661 | futex_nto1_prepare(&viewer_conn_queue.futex); |
d3e2ba59 | 662 | |
68924dc1 MD |
663 | if (CMM_LOAD_SHARED(live_dispatch_thread_exit)) { |
664 | break; | |
665 | } | |
666 | ||
d3e2ba59 | 667 | do { |
eea7556c MD |
668 | health_code_update(); |
669 | ||
d3e2ba59 | 670 | /* Dequeue commands */ |
8bdee6e2 SM |
671 | node = cds_wfcq_dequeue_blocking(&viewer_conn_queue.head, |
672 | &viewer_conn_queue.tail); | |
d3e2ba59 JD |
673 | if (node == NULL) { |
674 | DBG("Woken up but nothing in the live-viewer " | |
675 | "relay command queue"); | |
676 | /* Continue thread execution */ | |
677 | break; | |
678 | } | |
58eb9381 | 679 | conn = caa_container_of(node, struct relay_connection, qnode); |
d3e2ba59 | 680 | DBG("Dispatching viewer request waiting on sock %d", |
58eb9381 | 681 | conn->sock->fd); |
d3e2ba59 JD |
682 | |
683 | /* | |
7591bab1 MD |
684 | * Inform worker thread of the new request. This |
685 | * call is blocking so we can be assured that | |
686 | * the data will be read at some point in time | |
687 | * or wait to the end of the world :) | |
d3e2ba59 | 688 | */ |
58eb9381 DG |
689 | ret = lttng_write(live_conn_pipe[1], &conn, sizeof(conn)); |
690 | if (ret < 0) { | |
691 | PERROR("write conn pipe"); | |
7591bab1 | 692 | connection_put(conn); |
d3e2ba59 JD |
693 | goto error; |
694 | } | |
695 | } while (node != NULL); | |
696 | ||
697 | /* Futex wait on queue. Blocking call on futex() */ | |
eea7556c | 698 | health_poll_entry(); |
58eb9381 | 699 | futex_nto1_wait(&viewer_conn_queue.futex); |
eea7556c | 700 | health_poll_exit(); |
d3e2ba59 JD |
701 | } |
702 | ||
eea7556c MD |
703 | /* Normal exit, no error */ |
704 | err = 0; | |
705 | ||
d3e2ba59 | 706 | error: |
9b5e0863 | 707 | error_testpoint: |
eea7556c MD |
708 | if (err) { |
709 | health_error(); | |
710 | ERR("Health error occurred in %s", __func__); | |
711 | } | |
712 | health_unregister(health_relayd); | |
d3e2ba59 | 713 | DBG("Live viewer dispatch thread dying"); |
b4aacfdc MD |
714 | if (lttng_relay_stop_threads()) { |
715 | ERR("Error stopping threads"); | |
178a0557 | 716 | } |
d3e2ba59 JD |
717 | return NULL; |
718 | } | |
719 | ||
720 | /* | |
721 | * Establish connection with the viewer and check the versions. | |
722 | * | |
723 | * Return 0 on success or else negative value. | |
724 | */ | |
725 | static | |
58eb9381 | 726 | int viewer_connect(struct relay_connection *conn) |
d3e2ba59 JD |
727 | { |
728 | int ret; | |
729 | struct lttng_viewer_connect reply, msg; | |
730 | ||
58eb9381 | 731 | conn->version_check_done = 1; |
d3e2ba59 | 732 | |
eea7556c MD |
733 | health_code_update(); |
734 | ||
2f8f53af DG |
735 | DBG("Viewer is establishing a connection to the relayd."); |
736 | ||
58eb9381 | 737 | ret = recv_request(conn->sock, &msg, sizeof(msg)); |
2f8f53af | 738 | if (ret < 0) { |
d3e2ba59 JD |
739 | goto end; |
740 | } | |
741 | ||
eea7556c MD |
742 | health_code_update(); |
743 | ||
f46b2ce6 | 744 | memset(&reply, 0, sizeof(reply)); |
d3e2ba59 JD |
745 | reply.major = RELAYD_VERSION_COMM_MAJOR; |
746 | reply.minor = RELAYD_VERSION_COMM_MINOR; | |
747 | ||
748 | /* Major versions must be the same */ | |
749 | if (reply.major != be32toh(msg.major)) { | |
2f8f53af DG |
750 | DBG("Incompatible major versions ([relayd] %u vs [client] %u)", |
751 | reply.major, be32toh(msg.major)); | |
72180669 | 752 | ret = -1; |
d3e2ba59 JD |
753 | goto end; |
754 | } | |
755 | ||
58eb9381 | 756 | conn->major = reply.major; |
d3e2ba59 JD |
757 | /* We adapt to the lowest compatible version */ |
758 | if (reply.minor <= be32toh(msg.minor)) { | |
58eb9381 | 759 | conn->minor = reply.minor; |
d3e2ba59 | 760 | } else { |
58eb9381 | 761 | conn->minor = be32toh(msg.minor); |
d3e2ba59 JD |
762 | } |
763 | ||
c4e361a4 | 764 | if (be32toh(msg.type) == LTTNG_VIEWER_CLIENT_COMMAND) { |
58eb9381 | 765 | conn->type = RELAY_VIEWER_COMMAND; |
c4e361a4 | 766 | } else if (be32toh(msg.type) == LTTNG_VIEWER_CLIENT_NOTIFICATION) { |
58eb9381 | 767 | conn->type = RELAY_VIEWER_NOTIFICATION; |
d3e2ba59 JD |
768 | } else { |
769 | ERR("Unknown connection type : %u", be32toh(msg.type)); | |
770 | ret = -1; | |
771 | goto end; | |
772 | } | |
773 | ||
774 | reply.major = htobe32(reply.major); | |
775 | reply.minor = htobe32(reply.minor); | |
58eb9381 | 776 | if (conn->type == RELAY_VIEWER_COMMAND) { |
93b4787b | 777 | /* |
7591bab1 MD |
778 | * Increment outside of htobe64 macro, because the argument can |
779 | * be used more than once within the macro, and thus the | |
780 | * operation may be undefined. | |
93b4787b | 781 | */ |
7591bab1 | 782 | pthread_mutex_lock(&last_relay_viewer_session_id_lock); |
93b4787b | 783 | last_relay_viewer_session_id++; |
7591bab1 | 784 | pthread_mutex_unlock(&last_relay_viewer_session_id_lock); |
93b4787b | 785 | reply.viewer_session_id = htobe64(last_relay_viewer_session_id); |
d3e2ba59 | 786 | } |
eea7556c MD |
787 | |
788 | health_code_update(); | |
789 | ||
58eb9381 | 790 | ret = send_response(conn->sock, &reply, sizeof(reply)); |
d3e2ba59 | 791 | if (ret < 0) { |
2f8f53af | 792 | goto end; |
d3e2ba59 JD |
793 | } |
794 | ||
eea7556c MD |
795 | health_code_update(); |
796 | ||
58eb9381 | 797 | DBG("Version check done using protocol %u.%u", conn->major, conn->minor); |
d3e2ba59 JD |
798 | ret = 0; |
799 | ||
800 | end: | |
801 | return ret; | |
802 | } | |
803 | ||
804 | /* | |
805 | * Send the viewer the list of current sessions. | |
7591bab1 MD |
806 | * We need to create a copy of the hash table content because otherwise |
807 | * we cannot assume the number of entries stays the same between getting | |
808 | * the number of HT elements and iteration over the HT. | |
d3e2ba59 JD |
809 | * |
810 | * Return 0 on success or else a negative value. | |
811 | */ | |
812 | static | |
58eb9381 | 813 | int viewer_list_sessions(struct relay_connection *conn) |
d3e2ba59 | 814 | { |
5f10c6b1 | 815 | int ret = 0; |
d3e2ba59 | 816 | struct lttng_viewer_list_sessions session_list; |
d3e2ba59 | 817 | struct lttng_ht_iter iter; |
d3e2ba59 | 818 | struct relay_session *session; |
7591bab1 MD |
819 | struct lttng_viewer_session *send_session_buf = NULL; |
820 | uint32_t buf_count = SESSION_BUF_DEFAULT_COUNT; | |
821 | uint32_t count = 0; | |
d3e2ba59 JD |
822 | |
823 | DBG("List sessions received"); | |
824 | ||
7591bab1 MD |
825 | send_session_buf = zmalloc(SESSION_BUF_DEFAULT_COUNT * sizeof(*send_session_buf)); |
826 | if (!send_session_buf) { | |
827 | return -1; | |
d3e2ba59 JD |
828 | } |
829 | ||
7591bab1 MD |
830 | rcu_read_lock(); |
831 | cds_lfht_for_each_entry(sessions_ht->ht, &iter.iter, session, | |
2f8f53af | 832 | session_n.node) { |
7591bab1 | 833 | struct lttng_viewer_session *send_session; |
d3e2ba59 | 834 | |
eea7556c MD |
835 | health_code_update(); |
836 | ||
baa8150c JR |
837 | if (session->connection_closed) { |
838 | /* Skip closed session */ | |
839 | continue; | |
840 | } | |
841 | ||
7591bab1 MD |
842 | if (count >= buf_count) { |
843 | struct lttng_viewer_session *newbuf; | |
844 | uint32_t new_buf_count = buf_count << 1; | |
eea7556c | 845 | |
7591bab1 MD |
846 | newbuf = realloc(send_session_buf, |
847 | new_buf_count * sizeof(*send_session_buf)); | |
848 | if (!newbuf) { | |
849 | ret = -1; | |
5f10c6b1 | 850 | break; |
7591bab1 MD |
851 | } |
852 | send_session_buf = newbuf; | |
853 | buf_count = new_buf_count; | |
6763619c | 854 | } |
7591bab1 | 855 | send_session = &send_session_buf[count]; |
bfc3fb17 MD |
856 | if (lttng_strncpy(send_session->session_name, |
857 | session->session_name, | |
858 | sizeof(send_session->session_name))) { | |
859 | ret = -1; | |
5f10c6b1 | 860 | break; |
bfc3fb17 MD |
861 | } |
862 | if (lttng_strncpy(send_session->hostname, session->hostname, | |
863 | sizeof(send_session->hostname))) { | |
864 | ret = -1; | |
5f10c6b1 | 865 | break; |
bfc3fb17 | 866 | } |
7591bab1 MD |
867 | send_session->id = htobe64(session->id); |
868 | send_session->live_timer = htobe32(session->live_timer); | |
869 | if (session->viewer_attached) { | |
870 | send_session->clients = htobe32(1); | |
871 | } else { | |
872 | send_session->clients = htobe32(0); | |
d227d5bd | 873 | } |
7591bab1 MD |
874 | send_session->streams = htobe32(session->stream_count); |
875 | count++; | |
876 | } | |
877 | rcu_read_unlock(); | |
5f10c6b1 JG |
878 | if (ret < 0) { |
879 | goto end_free; | |
880 | } | |
d227d5bd | 881 | |
7591bab1 | 882 | session_list.sessions_count = htobe32(count); |
d227d5bd | 883 | |
7591bab1 | 884 | health_code_update(); |
d227d5bd | 885 | |
7591bab1 MD |
886 | ret = send_response(conn->sock, &session_list, sizeof(session_list)); |
887 | if (ret < 0) { | |
888 | goto end_free; | |
d227d5bd | 889 | } |
d227d5bd | 890 | |
7591bab1 | 891 | health_code_update(); |
d227d5bd | 892 | |
7591bab1 MD |
893 | ret = send_response(conn->sock, send_session_buf, |
894 | count * sizeof(*send_session_buf)); | |
895 | if (ret < 0) { | |
896 | goto end_free; | |
d227d5bd | 897 | } |
7591bab1 | 898 | health_code_update(); |
d227d5bd | 899 | |
7591bab1 MD |
900 | ret = 0; |
901 | end_free: | |
902 | free(send_session_buf); | |
903 | return ret; | |
d227d5bd JD |
904 | } |
905 | ||
80e8027a | 906 | /* |
7591bab1 | 907 | * Send the viewer the list of current streams. |
80e8027a JD |
908 | */ |
909 | static | |
58eb9381 | 910 | int viewer_get_new_streams(struct relay_connection *conn) |
80e8027a JD |
911 | { |
912 | int ret, send_streams = 0; | |
7591bab1 | 913 | uint32_t nb_created = 0, nb_unsent = 0, nb_streams = 0, nb_total = 0; |
80e8027a JD |
914 | struct lttng_viewer_new_streams_request request; |
915 | struct lttng_viewer_new_streams_response response; | |
80e8027a | 916 | struct relay_session *session; |
6763619c | 917 | uint64_t session_id; |
bddf80e4 | 918 | bool closed = false; |
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 | ||
7591bab1 | 937 | session = session_get_by_id(session_id); |
2f8f53af | 938 | if (!session) { |
6763619c | 939 | DBG("Relay session %" PRIu64 " not found", session_id); |
c4e361a4 | 940 | response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_ERR); |
80e8027a JD |
941 | goto send_reply; |
942 | } | |
943 | ||
7591bab1 | 944 | if (!viewer_session_is_attached(conn->viewer_session, session)) { |
80e8027a | 945 | send_streams = 0; |
c4e361a4 | 946 | response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_ERR); |
80e8027a JD |
947 | goto send_reply; |
948 | } | |
949 | ||
6763619c JD |
950 | send_streams = 1; |
951 | response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_OK); | |
952 | ||
7591bab1 | 953 | ret = make_viewer_streams(session, LTTNG_VIEWER_SEEK_LAST, &nb_total, &nb_unsent, |
bddf80e4 | 954 | &nb_created, &closed); |
2f8f53af | 955 | if (ret < 0) { |
7591bab1 | 956 | goto end_put_session; |
2f8f53af DG |
957 | } |
958 | /* Only send back the newly created streams with the unsent ones. */ | |
959 | nb_streams = nb_created + nb_unsent; | |
80e8027a JD |
960 | response.streams_count = htobe32(nb_streams); |
961 | ||
4479f682 | 962 | /* |
2229a09c MD |
963 | * If the session is closed, HUP when there are no more streams |
964 | * with data. | |
4479f682 | 965 | */ |
bddf80e4 | 966 | if (closed && nb_total == 0) { |
4479f682 | 967 | send_streams = 0; |
bddf80e4 | 968 | response.streams_count = 0; |
4479f682 JD |
969 | response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_HUP); |
970 | goto send_reply; | |
971 | } | |
972 | ||
80e8027a JD |
973 | send_reply: |
974 | health_code_update(); | |
58eb9381 | 975 | ret = send_response(conn->sock, &response, sizeof(response)); |
80e8027a | 976 | if (ret < 0) { |
7591bab1 | 977 | goto end_put_session; |
80e8027a JD |
978 | } |
979 | health_code_update(); | |
980 | ||
981 | /* | |
7591bab1 MD |
982 | * Unknown or empty session, just return gracefully, the viewer |
983 | * knows what is happening. | |
80e8027a JD |
984 | */ |
985 | if (!send_streams || !nb_streams) { | |
986 | ret = 0; | |
7591bab1 | 987 | goto end_put_session; |
80e8027a JD |
988 | } |
989 | ||
2f8f53af | 990 | /* |
7591bab1 MD |
991 | * Send stream and *DON'T* ignore the sent flag so every viewer |
992 | * streams that were not sent from that point will be sent to | |
993 | * the viewer. | |
2f8f53af | 994 | */ |
58eb9381 | 995 | ret = send_viewer_streams(conn->sock, session, 0); |
2f8f53af | 996 | if (ret < 0) { |
7591bab1 | 997 | goto end_put_session; |
80e8027a JD |
998 | } |
999 | ||
7591bab1 MD |
1000 | end_put_session: |
1001 | if (session) { | |
1002 | session_put(session); | |
1003 | } | |
80e8027a JD |
1004 | error: |
1005 | return ret; | |
1006 | } | |
1007 | ||
d3e2ba59 JD |
1008 | /* |
1009 | * Send the viewer the list of current sessions. | |
1010 | */ | |
1011 | static | |
58eb9381 | 1012 | int viewer_attach_session(struct relay_connection *conn) |
d3e2ba59 | 1013 | { |
2f8f53af DG |
1014 | int send_streams = 0; |
1015 | ssize_t ret; | |
80e8027a | 1016 | uint32_t nb_streams = 0; |
2f8f53af | 1017 | enum lttng_viewer_seek seek_type; |
d3e2ba59 JD |
1018 | struct lttng_viewer_attach_session_request request; |
1019 | struct lttng_viewer_attach_session_response response; | |
7591bab1 | 1020 | struct relay_session *session = NULL; |
bddf80e4 | 1021 | bool closed = false; |
d3e2ba59 | 1022 | |
58eb9381 | 1023 | assert(conn); |
d3e2ba59 | 1024 | |
eea7556c MD |
1025 | health_code_update(); |
1026 | ||
2f8f53af | 1027 | /* Receive the request from the connected client. */ |
58eb9381 | 1028 | ret = recv_request(conn->sock, &request, sizeof(request)); |
2f8f53af | 1029 | if (ret < 0) { |
d3e2ba59 JD |
1030 | goto error; |
1031 | } | |
1032 | ||
eea7556c MD |
1033 | health_code_update(); |
1034 | ||
53efb85a MD |
1035 | memset(&response, 0, sizeof(response)); |
1036 | ||
c3b7390b JD |
1037 | if (!conn->viewer_session) { |
1038 | DBG("Client trying to attach before creating a live viewer session"); | |
1039 | response.status = htobe32(LTTNG_VIEWER_ATTACH_NO_SESSION); | |
1040 | goto send_reply; | |
1041 | } | |
1042 | ||
7591bab1 | 1043 | session = session_get_by_id(be64toh(request.session_id)); |
2f8f53af | 1044 | if (!session) { |
d3e2ba59 | 1045 | DBG("Relay session %" PRIu64 " not found", |
f8fc08d2 | 1046 | (uint64_t) be64toh(request.session_id)); |
c4e361a4 | 1047 | response.status = htobe32(LTTNG_VIEWER_ATTACH_UNK); |
d3e2ba59 JD |
1048 | goto send_reply; |
1049 | } | |
7591bab1 | 1050 | DBG("Attach session ID %" PRIu64 " received", |
f8fc08d2 | 1051 | (uint64_t) be64toh(request.session_id)); |
d3e2ba59 | 1052 | |
7591bab1 | 1053 | if (session->live_timer == 0) { |
d3e2ba59 | 1054 | DBG("Not live session"); |
c4e361a4 | 1055 | response.status = htobe32(LTTNG_VIEWER_ATTACH_NOT_LIVE); |
d3e2ba59 | 1056 | goto send_reply; |
7591bab1 MD |
1057 | } |
1058 | ||
1059 | send_streams = 1; | |
1060 | ret = viewer_session_attach(conn->viewer_session, session); | |
1061 | if (ret) { | |
1062 | DBG("Already a viewer attached"); | |
1063 | response.status = htobe32(LTTNG_VIEWER_ATTACH_ALREADY); | |
1064 | goto send_reply; | |
d3e2ba59 JD |
1065 | } |
1066 | ||
1067 | switch (be32toh(request.seek)) { | |
c4e361a4 JD |
1068 | case LTTNG_VIEWER_SEEK_BEGINNING: |
1069 | case LTTNG_VIEWER_SEEK_LAST: | |
7591bab1 | 1070 | response.status = htobe32(LTTNG_VIEWER_ATTACH_OK); |
2f8f53af | 1071 | seek_type = be32toh(request.seek); |
d3e2ba59 JD |
1072 | break; |
1073 | default: | |
1074 | ERR("Wrong seek parameter"); | |
c4e361a4 | 1075 | response.status = htobe32(LTTNG_VIEWER_ATTACH_SEEK_ERR); |
d3e2ba59 JD |
1076 | send_streams = 0; |
1077 | goto send_reply; | |
1078 | } | |
1079 | ||
bddf80e4 MD |
1080 | ret = make_viewer_streams(session, seek_type, &nb_streams, NULL, |
1081 | NULL, &closed); | |
2f8f53af | 1082 | if (ret < 0) { |
7591bab1 | 1083 | goto end_put_session; |
d3e2ba59 | 1084 | } |
2f8f53af | 1085 | response.streams_count = htobe32(nb_streams); |
d3e2ba59 | 1086 | |
bddf80e4 MD |
1087 | /* |
1088 | * If the session is closed when the viewer is attaching, it | |
1089 | * means some of the streams may have been concurrently removed, | |
1090 | * so we don't allow the viewer to attach, even if there are | |
1091 | * streams available. | |
1092 | */ | |
1093 | if (closed) { | |
1094 | send_streams = 0; | |
1095 | response.streams_count = 0; | |
6d801f10 | 1096 | response.status = htobe32(LTTNG_VIEWER_ATTACH_UNK); |
bddf80e4 MD |
1097 | goto send_reply; |
1098 | } | |
1099 | ||
d3e2ba59 | 1100 | send_reply: |
eea7556c | 1101 | health_code_update(); |
58eb9381 | 1102 | ret = send_response(conn->sock, &response, sizeof(response)); |
d3e2ba59 | 1103 | if (ret < 0) { |
7591bab1 | 1104 | goto end_put_session; |
d3e2ba59 | 1105 | } |
eea7556c | 1106 | health_code_update(); |
d3e2ba59 JD |
1107 | |
1108 | /* | |
7591bab1 MD |
1109 | * Unknown or empty session, just return gracefully, the viewer |
1110 | * knows what is happening. | |
d3e2ba59 | 1111 | */ |
157df586 | 1112 | if (!send_streams || !nb_streams) { |
d3e2ba59 | 1113 | ret = 0; |
7591bab1 | 1114 | goto end_put_session; |
d3e2ba59 JD |
1115 | } |
1116 | ||
2f8f53af | 1117 | /* Send stream and ignore the sent flag. */ |
58eb9381 | 1118 | ret = send_viewer_streams(conn->sock, session, 1); |
2f8f53af | 1119 | if (ret < 0) { |
7591bab1 | 1120 | goto end_put_session; |
d3e2ba59 | 1121 | } |
d3e2ba59 | 1122 | |
7591bab1 MD |
1123 | end_put_session: |
1124 | if (session) { | |
1125 | session_put(session); | |
1126 | } | |
4a9daf17 JD |
1127 | error: |
1128 | return ret; | |
1129 | } | |
1130 | ||
878c34cf DG |
1131 | /* |
1132 | * Open the index file if needed for the given vstream. | |
1133 | * | |
e0547b83 MD |
1134 | * If an index file is successfully opened, the vstream will set it as its |
1135 | * current index file. | |
878c34cf DG |
1136 | * |
1137 | * Return 0 on success, a negative value on error (-ENOENT if not ready yet). | |
7591bab1 MD |
1138 | * |
1139 | * Called with rstream lock held. | |
878c34cf DG |
1140 | */ |
1141 | static int try_open_index(struct relay_viewer_stream *vstream, | |
1142 | struct relay_stream *rstream) | |
1143 | { | |
1144 | int ret = 0; | |
1145 | ||
e0547b83 | 1146 | if (vstream->index_file) { |
878c34cf DG |
1147 | goto end; |
1148 | } | |
1149 | ||
1150 | /* | |
7591bab1 | 1151 | * First time, we open the index file and at least one index is ready. |
878c34cf | 1152 | */ |
a44ca2ca | 1153 | if (rstream->index_received_seqcount == 0) { |
878c34cf DG |
1154 | ret = -ENOENT; |
1155 | goto end; | |
1156 | } | |
e0547b83 MD |
1157 | vstream->index_file = lttng_index_file_open(vstream->path_name, |
1158 | vstream->channel_name, | |
7591bab1 MD |
1159 | vstream->stream->tracefile_count, |
1160 | vstream->current_tracefile_id); | |
e0547b83 MD |
1161 | if (!vstream->index_file) { |
1162 | ret = -1; | |
878c34cf DG |
1163 | } |
1164 | ||
1165 | end: | |
1166 | return ret; | |
1167 | } | |
1168 | ||
1169 | /* | |
7591bab1 MD |
1170 | * Check the status of the index for the given stream. This function |
1171 | * updates the index structure if needed and can put (close) the vstream | |
1172 | * in the HUP situation. | |
1173 | * | |
1174 | * Return 0 means that we can proceed with the index. A value of 1 means | |
1175 | * that the index has been updated and is ready to be sent to the | |
1176 | * client. A negative value indicates an error that can't be handled. | |
878c34cf | 1177 | * |
7591bab1 | 1178 | * Called with rstream lock held. |
878c34cf DG |
1179 | */ |
1180 | static int check_index_status(struct relay_viewer_stream *vstream, | |
1181 | struct relay_stream *rstream, struct ctf_trace *trace, | |
1182 | struct lttng_viewer_index *index) | |
1183 | { | |
1184 | int ret; | |
1185 | ||
7591bab1 | 1186 | if (trace->session->connection_closed |
a44ca2ca MD |
1187 | && rstream->index_received_seqcount |
1188 | == vstream->index_sent_seqcount) { | |
7591bab1 MD |
1189 | /* Last index sent and session connection is closed. */ |
1190 | index->status = htobe32(LTTNG_VIEWER_INDEX_HUP); | |
1191 | goto hup; | |
1192 | } else if (rstream->beacon_ts_end != -1ULL && | |
a44ca2ca MD |
1193 | rstream->index_received_seqcount |
1194 | == vstream->index_sent_seqcount) { | |
7591bab1 MD |
1195 | /* |
1196 | * We've received a synchronization beacon and the last index | |
1197 | * available has been sent, the index for now is inactive. | |
1198 | * | |
1199 | * In this case, we have received a beacon which allows us to | |
1200 | * inform the client of a time interval during which we can | |
1201 | * guarantee that there are no events to read (and never will | |
1202 | * be). | |
1203 | */ | |
1204 | index->status = htobe32(LTTNG_VIEWER_INDEX_INACTIVE); | |
1205 | index->timestamp_end = htobe64(rstream->beacon_ts_end); | |
1206 | index->stream_id = htobe64(rstream->ctf_stream_id); | |
1207 | goto index_ready; | |
a44ca2ca MD |
1208 | } else if (rstream->index_received_seqcount |
1209 | == vstream->index_sent_seqcount) { | |
7591bab1 | 1210 | /* |
a44ca2ca MD |
1211 | * This checks whether received == sent seqcount. In |
1212 | * this case, we have not received a beacon. Therefore, | |
1213 | * we can only ask the client to retry later. | |
7591bab1 MD |
1214 | */ |
1215 | index->status = htobe32(LTTNG_VIEWER_INDEX_RETRY); | |
1216 | goto index_ready; | |
a44ca2ca MD |
1217 | } else if (!tracefile_array_seq_in_file(rstream->tfa, |
1218 | vstream->current_tracefile_id, | |
1219 | vstream->index_sent_seqcount)) { | |
7591bab1 | 1220 | /* |
a44ca2ca MD |
1221 | * The next index we want to send cannot be read either |
1222 | * because we need to perform a rotation, or due to | |
1223 | * the producer having overwritten its trace file. | |
7591bab1 | 1224 | */ |
a44ca2ca | 1225 | DBG("Viewer stream %" PRIu64 " rotation", |
7591bab1 MD |
1226 | vstream->stream->stream_handle); |
1227 | ret = viewer_stream_rotate(vstream); | |
1228 | if (ret < 0) { | |
1229 | goto end; | |
1230 | } else if (ret == 1) { | |
1231 | /* EOF across entire stream. */ | |
1232 | index->status = htobe32(LTTNG_VIEWER_INDEX_HUP); | |
1233 | goto hup; | |
1234 | } | |
7591bab1 | 1235 | /* |
a44ca2ca MD |
1236 | * If we have been pushed due to overwrite, it |
1237 | * necessarily means there is data that can be read in | |
1238 | * the stream. If we rotated because we reached the end | |
1239 | * of a tracefile, it means the following tracefile | |
1240 | * needs to contain at least one index, else we would | |
1241 | * have already returned LTTNG_VIEWER_INDEX_RETRY to the | |
1242 | * viewer. The updated index_sent_seqcount needs to | |
1243 | * point to a readable index entry now. | |
1244 | * | |
1245 | * In the case where we "rotate" on a single file, we | |
1246 | * can end up in a case where the requested index is | |
1247 | * still unavailable. | |
7591bab1 | 1248 | */ |
a44ca2ca MD |
1249 | if (rstream->tracefile_count == 1 && |
1250 | !tracefile_array_seq_in_file( | |
1251 | rstream->tfa, | |
1252 | vstream->current_tracefile_id, | |
1253 | vstream->index_sent_seqcount)) { | |
1254 | index->status = htobe32(LTTNG_VIEWER_INDEX_RETRY); | |
1255 | goto index_ready; | |
878c34cf | 1256 | } |
a44ca2ca MD |
1257 | assert(tracefile_array_seq_in_file(rstream->tfa, |
1258 | vstream->current_tracefile_id, | |
1259 | vstream->index_sent_seqcount)); | |
878c34cf | 1260 | } |
a44ca2ca MD |
1261 | /* ret == 0 means successful so we continue. */ |
1262 | ret = 0; | |
7591bab1 | 1263 | end: |
878c34cf DG |
1264 | return ret; |
1265 | ||
1266 | hup: | |
7591bab1 | 1267 | viewer_stream_put(vstream); |
878c34cf DG |
1268 | index_ready: |
1269 | return 1; | |
1270 | } | |
1271 | ||
d3e2ba59 JD |
1272 | /* |
1273 | * Send the next index for a stream. | |
1274 | * | |
1275 | * Return 0 on success or else a negative value. | |
1276 | */ | |
1277 | static | |
58eb9381 | 1278 | int viewer_get_next_index(struct relay_connection *conn) |
d3e2ba59 JD |
1279 | { |
1280 | int ret; | |
1281 | struct lttng_viewer_get_next_index request_index; | |
1282 | struct lttng_viewer_index viewer_index; | |
50adc264 | 1283 | struct ctf_packet_index packet_index; |
7591bab1 MD |
1284 | struct relay_viewer_stream *vstream = NULL; |
1285 | struct relay_stream *rstream = NULL; | |
1286 | struct ctf_trace *ctf_trace = NULL; | |
1287 | struct relay_viewer_stream *metadata_viewer_stream = NULL; | |
d3e2ba59 | 1288 | |
58eb9381 | 1289 | assert(conn); |
d3e2ba59 JD |
1290 | |
1291 | DBG("Viewer get next index"); | |
1292 | ||
7591bab1 | 1293 | memset(&viewer_index, 0, sizeof(viewer_index)); |
eea7556c | 1294 | health_code_update(); |
2f8f53af | 1295 | |
58eb9381 | 1296 | ret = recv_request(conn->sock, &request_index, sizeof(request_index)); |
2f8f53af | 1297 | if (ret < 0) { |
d3e2ba59 JD |
1298 | goto end; |
1299 | } | |
eea7556c | 1300 | health_code_update(); |
d3e2ba59 | 1301 | |
7591bab1 | 1302 | vstream = viewer_stream_get_by_id(be64toh(request_index.stream_id)); |
6763619c | 1303 | if (!vstream) { |
a44ca2ca | 1304 | DBG("Client requested index of unknown stream id %" PRIu64, |
f8fc08d2 | 1305 | (uint64_t) be64toh(request_index.stream_id)); |
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 | ||
e0547b83 MD |
1403 | ret = lttng_index_file_read(vstream->index_file, &packet_index); |
1404 | if (ret) { | |
1405 | ERR("Relay error reading index file %d", | |
1406 | vstream->index_file->fd); | |
7591bab1 | 1407 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR); |
6b6b9a5a | 1408 | goto send_reply; |
d3e2ba59 | 1409 | } else { |
c4e361a4 | 1410 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_OK); |
a44ca2ca | 1411 | vstream->index_sent_seqcount++; |
d3e2ba59 JD |
1412 | } |
1413 | ||
1414 | /* | |
1415 | * Indexes are stored in big endian, no need to switch before sending. | |
1416 | */ | |
7591bab1 MD |
1417 | DBG("Sending viewer index for stream %" PRIu64 " offset %" PRIu64, |
1418 | rstream->stream_handle, | |
f8fc08d2 | 1419 | (uint64_t) be64toh(packet_index.offset)); |
d3e2ba59 JD |
1420 | viewer_index.offset = packet_index.offset; |
1421 | viewer_index.packet_size = packet_index.packet_size; | |
1422 | viewer_index.content_size = packet_index.content_size; | |
1423 | viewer_index.timestamp_begin = packet_index.timestamp_begin; | |
1424 | viewer_index.timestamp_end = packet_index.timestamp_end; | |
1425 | viewer_index.events_discarded = packet_index.events_discarded; | |
1426 | viewer_index.stream_id = packet_index.stream_id; | |
1427 | ||
1428 | send_reply: | |
f1883937 MD |
1429 | if (rstream) { |
1430 | pthread_mutex_unlock(&rstream->lock); | |
1431 | } | |
7591bab1 MD |
1432 | |
1433 | if (metadata_viewer_stream) { | |
1434 | pthread_mutex_lock(&metadata_viewer_stream->stream->lock); | |
1435 | DBG("get next index metadata check: recv %" PRIu64 | |
1436 | " sent %" PRIu64, | |
1437 | metadata_viewer_stream->stream->metadata_received, | |
1438 | metadata_viewer_stream->metadata_sent); | |
1439 | if (!metadata_viewer_stream->stream->metadata_received || | |
1440 | metadata_viewer_stream->stream->metadata_received > | |
1441 | metadata_viewer_stream->metadata_sent) { | |
1442 | viewer_index.flags |= LTTNG_VIEWER_FLAG_NEW_METADATA; | |
1443 | } | |
1444 | pthread_mutex_unlock(&metadata_viewer_stream->stream->lock); | |
1445 | } | |
1446 | ||
d3e2ba59 | 1447 | viewer_index.flags = htobe32(viewer_index.flags); |
eea7556c | 1448 | health_code_update(); |
2f8f53af | 1449 | |
58eb9381 | 1450 | ret = send_response(conn->sock, &viewer_index, sizeof(viewer_index)); |
d3e2ba59 | 1451 | if (ret < 0) { |
7591bab1 | 1452 | goto end; |
d3e2ba59 | 1453 | } |
eea7556c | 1454 | health_code_update(); |
d3e2ba59 | 1455 | |
9237e6a1 MD |
1456 | if (vstream) { |
1457 | DBG("Index %" PRIu64 " for stream %" PRIu64 " sent", | |
a44ca2ca | 1458 | vstream->index_sent_seqcount, |
9237e6a1 MD |
1459 | vstream->stream->stream_handle); |
1460 | } | |
d3e2ba59 | 1461 | end: |
7591bab1 MD |
1462 | if (metadata_viewer_stream) { |
1463 | viewer_stream_put(metadata_viewer_stream); | |
1464 | } | |
1465 | if (vstream) { | |
1466 | viewer_stream_put(vstream); | |
1467 | } | |
1468 | return ret; | |
1469 | ||
1470 | error_put: | |
1471 | pthread_mutex_unlock(&rstream->lock); | |
1472 | if (metadata_viewer_stream) { | |
1473 | viewer_stream_put(metadata_viewer_stream); | |
1474 | } | |
1475 | viewer_stream_put(vstream); | |
d3e2ba59 JD |
1476 | return ret; |
1477 | } | |
1478 | ||
1479 | /* | |
1480 | * Send the next index for a stream | |
1481 | * | |
1482 | * Return 0 on success or else a negative value. | |
1483 | */ | |
1484 | static | |
58eb9381 | 1485 | int viewer_get_packet(struct relay_connection *conn) |
d3e2ba59 | 1486 | { |
4e8db96d | 1487 | int ret; |
b61e1dca | 1488 | off_t lseek_ret; |
6d1bce6b | 1489 | char *reply = NULL; |
d3e2ba59 | 1490 | struct lttng_viewer_get_packet get_packet_info; |
6d1bce6b | 1491 | struct lttng_viewer_trace_packet reply_header; |
7591bab1 | 1492 | struct relay_viewer_stream *vstream = NULL; |
6d1bce6b | 1493 | uint32_t reply_size = sizeof(reply_header); |
4e8db96d JR |
1494 | uint32_t packet_data_len = 0; |
1495 | ssize_t read_len; | |
d3e2ba59 JD |
1496 | |
1497 | DBG2("Relay get data packet"); | |
1498 | ||
eea7556c | 1499 | health_code_update(); |
2f8f53af | 1500 | |
7591bab1 MD |
1501 | ret = recv_request(conn->sock, &get_packet_info, |
1502 | sizeof(get_packet_info)); | |
2f8f53af | 1503 | if (ret < 0) { |
d3e2ba59 JD |
1504 | goto end; |
1505 | } | |
eea7556c | 1506 | health_code_update(); |
d3e2ba59 | 1507 | |
0233a6a5 | 1508 | /* From this point on, the error label can be reached. */ |
6d1bce6b | 1509 | memset(&reply_header, 0, sizeof(reply_header)); |
0233a6a5 | 1510 | |
7591bab1 MD |
1511 | vstream = viewer_stream_get_by_id(be64toh(get_packet_info.stream_id)); |
1512 | if (!vstream) { | |
a44ca2ca | 1513 | DBG("Client requested packet of unknown stream id %" PRIu64, |
f8fc08d2 | 1514 | (uint64_t) be64toh(get_packet_info.stream_id)); |
6d1bce6b JG |
1515 | reply_header.status = htobe32(LTTNG_VIEWER_GET_PACKET_ERR); |
1516 | goto send_reply_nolock; | |
4e8db96d JR |
1517 | } else { |
1518 | packet_data_len = be32toh(get_packet_info.len); | |
6d1bce6b | 1519 | reply_size += packet_data_len; |
d3e2ba59 | 1520 | } |
2a174661 | 1521 | |
6d1bce6b JG |
1522 | reply = zmalloc(reply_size); |
1523 | if (!reply) { | |
1524 | PERROR("packet reply zmalloc"); | |
1525 | reply_size = sizeof(reply_header); | |
d3e2ba59 JD |
1526 | goto error; |
1527 | } | |
1528 | ||
4e8db96d | 1529 | pthread_mutex_lock(&vstream->stream->lock); |
b61e1dca | 1530 | lseek_ret = lseek(vstream->stream_fd->fd, be64toh(get_packet_info.offset), |
7591bab1 | 1531 | SEEK_SET); |
b61e1dca | 1532 | if (lseek_ret < 0) { |
7591bab1 | 1533 | PERROR("lseek fd %d to offset %" PRIu64, vstream->stream_fd->fd, |
f8fc08d2 | 1534 | (uint64_t) be64toh(get_packet_info.offset)); |
7591bab1 | 1535 | goto error; |
d3e2ba59 | 1536 | } |
4e8db96d | 1537 | read_len = lttng_read(vstream->stream_fd->fd, |
6d1bce6b | 1538 | reply + sizeof(reply_header), |
4e8db96d JR |
1539 | packet_data_len); |
1540 | if (read_len < packet_data_len) { | |
7591bab1 MD |
1541 | PERROR("Relay reading trace file, fd: %d, offset: %" PRIu64, |
1542 | vstream->stream_fd->fd, | |
f8fc08d2 | 1543 | (uint64_t) be64toh(get_packet_info.offset)); |
7591bab1 | 1544 | goto error; |
d3e2ba59 | 1545 | } |
6d1bce6b JG |
1546 | reply_header.status = htobe32(LTTNG_VIEWER_GET_PACKET_OK); |
1547 | reply_header.len = htobe32(packet_data_len); | |
d3e2ba59 JD |
1548 | goto send_reply; |
1549 | ||
1550 | error: | |
6d1bce6b | 1551 | reply_header.status = htobe32(LTTNG_VIEWER_GET_PACKET_ERR); |
d3e2ba59 JD |
1552 | |
1553 | send_reply: | |
7591bab1 MD |
1554 | if (vstream) { |
1555 | pthread_mutex_unlock(&vstream->stream->lock); | |
1556 | } | |
1557 | send_reply_nolock: | |
eea7556c MD |
1558 | |
1559 | health_code_update(); | |
2f8f53af | 1560 | |
6d1bce6b JG |
1561 | if (reply) { |
1562 | memcpy(reply, &reply_header, sizeof(reply_header)); | |
1563 | ret = send_response(conn->sock, reply, reply_size); | |
1564 | } else { | |
1565 | /* No reply to send. */ | |
1566 | ret = send_response(conn->sock, &reply_header, | |
1567 | reply_size); | |
1568 | } | |
1569 | ||
4e8db96d | 1570 | health_code_update(); |
d3e2ba59 | 1571 | if (ret < 0) { |
4e8db96d | 1572 | PERROR("sendmsg of packet data failed"); |
7591bab1 | 1573 | goto end_free; |
d3e2ba59 | 1574 | } |
d3e2ba59 | 1575 | |
6d1bce6b | 1576 | DBG("Sent %u bytes for stream %" PRIu64, reply_size, |
f8fc08d2 | 1577 | (uint64_t) be64toh(get_packet_info.stream_id)); |
d3e2ba59 | 1578 | |
7591bab1 | 1579 | end_free: |
6d1bce6b | 1580 | free(reply); |
d3e2ba59 | 1581 | end: |
7591bab1 MD |
1582 | if (vstream) { |
1583 | viewer_stream_put(vstream); | |
1584 | } | |
d3e2ba59 JD |
1585 | return ret; |
1586 | } | |
1587 | ||
1588 | /* | |
1589 | * Send the session's metadata | |
1590 | * | |
1591 | * Return 0 on success else a negative value. | |
1592 | */ | |
1593 | static | |
58eb9381 | 1594 | int viewer_get_metadata(struct relay_connection *conn) |
d3e2ba59 JD |
1595 | { |
1596 | int ret = 0; | |
1597 | ssize_t read_len; | |
1598 | uint64_t len = 0; | |
1599 | char *data = NULL; | |
1600 | struct lttng_viewer_get_metadata request; | |
1601 | struct lttng_viewer_metadata_packet reply; | |
7591bab1 | 1602 | struct relay_viewer_stream *vstream = NULL; |
d3e2ba59 | 1603 | |
58eb9381 | 1604 | assert(conn); |
d3e2ba59 JD |
1605 | |
1606 | DBG("Relay get metadata"); | |
1607 | ||
eea7556c | 1608 | health_code_update(); |
2f8f53af | 1609 | |
58eb9381 | 1610 | ret = recv_request(conn->sock, &request, sizeof(request)); |
2f8f53af | 1611 | if (ret < 0) { |
d3e2ba59 JD |
1612 | goto end; |
1613 | } | |
eea7556c | 1614 | health_code_update(); |
d3e2ba59 | 1615 | |
53efb85a MD |
1616 | memset(&reply, 0, sizeof(reply)); |
1617 | ||
7591bab1 MD |
1618 | vstream = viewer_stream_get_by_id(be64toh(request.stream_id)); |
1619 | if (!vstream) { | |
3b463131 MD |
1620 | /* |
1621 | * The metadata stream can be closed by a CLOSE command | |
1622 | * just before we attach. It can also be closed by | |
1623 | * per-pid tracing during tracing. Therefore, it is | |
1624 | * possible that we cannot find this viewer stream. | |
1625 | * Reply back to the client with an error if we cannot | |
1626 | * find it. | |
1627 | */ | |
a44ca2ca | 1628 | DBG("Client requested metadata of unknown stream id %" PRIu64, |
f8fc08d2 | 1629 | (uint64_t) be64toh(request.stream_id)); |
3b463131 | 1630 | reply.status = htobe32(LTTNG_VIEWER_METADATA_ERR); |
7591bab1 | 1631 | goto send_reply; |
d3e2ba59 | 1632 | } |
7591bab1 MD |
1633 | pthread_mutex_lock(&vstream->stream->lock); |
1634 | if (!vstream->stream->is_metadata) { | |
1635 | ERR("Invalid metadata stream"); | |
6763619c JD |
1636 | goto error; |
1637 | } | |
1638 | ||
7591bab1 | 1639 | assert(vstream->metadata_sent <= vstream->stream->metadata_received); |
2a174661 | 1640 | |
7591bab1 | 1641 | len = vstream->stream->metadata_received - vstream->metadata_sent; |
d3e2ba59 | 1642 | if (len == 0) { |
c4e361a4 | 1643 | reply.status = htobe32(LTTNG_VIEWER_NO_NEW_METADATA); |
d3e2ba59 JD |
1644 | goto send_reply; |
1645 | } | |
1646 | ||
1647 | /* first time, we open the metadata file */ | |
7591bab1 | 1648 | if (!vstream->stream_fd) { |
d3e2ba59 JD |
1649 | char fullpath[PATH_MAX]; |
1650 | ||
7591bab1 MD |
1651 | ret = snprintf(fullpath, PATH_MAX, "%s/%s", vstream->path_name, |
1652 | vstream->channel_name); | |
d3e2ba59 JD |
1653 | if (ret < 0) { |
1654 | goto error; | |
1655 | } | |
1656 | ret = open(fullpath, O_RDONLY); | |
1657 | if (ret < 0) { | |
1658 | PERROR("Relay opening metadata file"); | |
1659 | goto error; | |
1660 | } | |
7591bab1 MD |
1661 | vstream->stream_fd = stream_fd_create(ret); |
1662 | if (!vstream->stream_fd) { | |
1663 | if (close(ret)) { | |
1664 | PERROR("close"); | |
1665 | } | |
1666 | goto error; | |
1667 | } | |
d3e2ba59 JD |
1668 | } |
1669 | ||
1670 | reply.len = htobe64(len); | |
1671 | data = zmalloc(len); | |
1672 | if (!data) { | |
1673 | PERROR("viewer metadata zmalloc"); | |
1674 | goto error; | |
1675 | } | |
1676 | ||
7591bab1 | 1677 | read_len = lttng_read(vstream->stream_fd->fd, data, len); |
6cd525e8 | 1678 | if (read_len < len) { |
d3e2ba59 JD |
1679 | PERROR("Relay reading metadata file"); |
1680 | goto error; | |
1681 | } | |
7591bab1 MD |
1682 | vstream->metadata_sent += read_len; |
1683 | if (vstream->metadata_sent == vstream->stream->metadata_received | |
1684 | && vstream->stream->closed) { | |
1685 | /* Release ownership for the viewer metadata stream. */ | |
1686 | viewer_stream_put(vstream); | |
1687 | } | |
1688 | ||
c4e361a4 | 1689 | reply.status = htobe32(LTTNG_VIEWER_METADATA_OK); |
7591bab1 | 1690 | |
d3e2ba59 JD |
1691 | goto send_reply; |
1692 | ||
1693 | error: | |
c4e361a4 | 1694 | reply.status = htobe32(LTTNG_VIEWER_METADATA_ERR); |
d3e2ba59 JD |
1695 | |
1696 | send_reply: | |
eea7556c | 1697 | health_code_update(); |
7591bab1 MD |
1698 | if (vstream) { |
1699 | pthread_mutex_unlock(&vstream->stream->lock); | |
1700 | } | |
58eb9381 | 1701 | ret = send_response(conn->sock, &reply, sizeof(reply)); |
d3e2ba59 | 1702 | if (ret < 0) { |
7591bab1 | 1703 | goto end_free; |
d3e2ba59 | 1704 | } |
eea7556c | 1705 | health_code_update(); |
d3e2ba59 JD |
1706 | |
1707 | if (len > 0) { | |
58eb9381 | 1708 | ret = send_response(conn->sock, data, len); |
d3e2ba59 | 1709 | if (ret < 0) { |
7591bab1 | 1710 | goto end_free; |
d3e2ba59 JD |
1711 | } |
1712 | } | |
1713 | ||
1714 | DBG("Sent %" PRIu64 " bytes of metadata for stream %" PRIu64, len, | |
f8fc08d2 | 1715 | (uint64_t) be64toh(request.stream_id)); |
d3e2ba59 JD |
1716 | |
1717 | DBG("Metadata sent"); | |
1718 | ||
7591bab1 | 1719 | end_free: |
d3e2ba59 | 1720 | free(data); |
d3e2ba59 | 1721 | end: |
7591bab1 MD |
1722 | if (vstream) { |
1723 | viewer_stream_put(vstream); | |
1724 | } | |
d3e2ba59 JD |
1725 | return ret; |
1726 | } | |
1727 | ||
c3b7390b JD |
1728 | /* |
1729 | * Create a viewer session. | |
1730 | * | |
1731 | * Return 0 on success or else a negative value. | |
1732 | */ | |
1733 | static | |
1734 | int viewer_create_session(struct relay_connection *conn) | |
1735 | { | |
1736 | int ret; | |
1737 | struct lttng_viewer_create_session_response resp; | |
1738 | ||
1739 | DBG("Viewer create session received"); | |
1740 | ||
53efb85a | 1741 | memset(&resp, 0, sizeof(resp)); |
c3b7390b | 1742 | resp.status = htobe32(LTTNG_VIEWER_CREATE_SESSION_OK); |
7591bab1 | 1743 | conn->viewer_session = viewer_session_create(); |
c3b7390b JD |
1744 | if (!conn->viewer_session) { |
1745 | ERR("Allocation viewer session"); | |
1746 | resp.status = htobe32(LTTNG_VIEWER_CREATE_SESSION_ERR); | |
1747 | goto send_reply; | |
1748 | } | |
c3b7390b JD |
1749 | |
1750 | send_reply: | |
1751 | health_code_update(); | |
1752 | ret = send_response(conn->sock, &resp, sizeof(resp)); | |
1753 | if (ret < 0) { | |
1754 | goto end; | |
1755 | } | |
1756 | health_code_update(); | |
1757 | ret = 0; | |
1758 | ||
1759 | end: | |
1760 | return ret; | |
1761 | } | |
1762 | ||
d62023be JD |
1763 | /* |
1764 | * Detach a viewer session. | |
1765 | * | |
1766 | * Return 0 on success or else a negative value. | |
1767 | */ | |
1768 | static | |
1769 | int viewer_detach_session(struct relay_connection *conn) | |
1770 | { | |
1771 | int ret; | |
1772 | struct lttng_viewer_detach_session_response response; | |
1773 | struct lttng_viewer_detach_session_request request; | |
1774 | struct relay_session *session = NULL; | |
1775 | uint64_t viewer_session_to_close; | |
1776 | ||
1777 | DBG("Viewer detach session received"); | |
1778 | ||
1779 | assert(conn); | |
1780 | ||
1781 | health_code_update(); | |
1782 | ||
1783 | /* Receive the request from the connected client. */ | |
1784 | ret = recv_request(conn->sock, &request, sizeof(request)); | |
1785 | if (ret < 0) { | |
1786 | goto end; | |
1787 | } | |
1788 | viewer_session_to_close = be64toh(request.session_id); | |
1789 | ||
1790 | if (!conn->viewer_session) { | |
1791 | DBG("Client trying to detach before creating a live viewer session"); | |
1792 | response.status = htobe32(LTTNG_VIEWER_DETACH_SESSION_ERR); | |
1793 | goto send_reply; | |
1794 | } | |
1795 | ||
1796 | health_code_update(); | |
1797 | ||
1798 | memset(&response, 0, sizeof(response)); | |
1799 | DBG("Detaching from session ID %" PRIu64, viewer_session_to_close); | |
1800 | ||
1801 | session = session_get_by_id(be64toh(request.session_id)); | |
1802 | if (!session) { | |
1803 | DBG("Relay session %" PRIu64 " not found", | |
f8fc08d2 | 1804 | (uint64_t) be64toh(request.session_id)); |
d62023be JD |
1805 | response.status = htobe32(LTTNG_VIEWER_DETACH_SESSION_UNK); |
1806 | goto send_reply; | |
1807 | } | |
1808 | ||
1809 | ret = viewer_session_is_attached(conn->viewer_session, session); | |
1810 | if (ret != 1) { | |
1811 | DBG("Not attached to this session"); | |
1812 | response.status = htobe32(LTTNG_VIEWER_DETACH_SESSION_ERR); | |
1813 | goto send_reply_put; | |
1814 | } | |
1815 | ||
1816 | viewer_session_close_one_session(conn->viewer_session, session); | |
1817 | response.status = htobe32(LTTNG_VIEWER_DETACH_SESSION_OK); | |
1818 | DBG("Session %" PRIu64 " detached.", viewer_session_to_close); | |
1819 | ||
1820 | send_reply_put: | |
1821 | session_put(session); | |
1822 | ||
1823 | send_reply: | |
1824 | health_code_update(); | |
1825 | ret = send_response(conn->sock, &response, sizeof(response)); | |
1826 | if (ret < 0) { | |
1827 | goto end; | |
1828 | } | |
1829 | health_code_update(); | |
1830 | ret = 0; | |
1831 | ||
1832 | end: | |
1833 | return ret; | |
1834 | } | |
c3b7390b | 1835 | |
d3e2ba59 JD |
1836 | /* |
1837 | * live_relay_unknown_command: send -1 if received unknown command | |
1838 | */ | |
1839 | static | |
58eb9381 | 1840 | void live_relay_unknown_command(struct relay_connection *conn) |
d3e2ba59 JD |
1841 | { |
1842 | struct lttcomm_relayd_generic_reply reply; | |
d3e2ba59 | 1843 | |
53efb85a | 1844 | memset(&reply, 0, sizeof(reply)); |
d3e2ba59 | 1845 | reply.ret_code = htobe32(LTTNG_ERR_UNK); |
58eb9381 | 1846 | (void) send_response(conn->sock, &reply, sizeof(reply)); |
d3e2ba59 JD |
1847 | } |
1848 | ||
1849 | /* | |
1850 | * Process the commands received on the control socket | |
1851 | */ | |
1852 | static | |
1853 | int process_control(struct lttng_viewer_cmd *recv_hdr, | |
58eb9381 | 1854 | struct relay_connection *conn) |
d3e2ba59 JD |
1855 | { |
1856 | int ret = 0; | |
2f8f53af DG |
1857 | uint32_t msg_value; |
1858 | ||
2f8f53af DG |
1859 | msg_value = be32toh(recv_hdr->cmd); |
1860 | ||
1861 | /* | |
1862 | * Make sure we've done the version check before any command other then a | |
1863 | * new client connection. | |
1864 | */ | |
c4e361a4 | 1865 | if (msg_value != LTTNG_VIEWER_CONNECT && !conn->version_check_done) { |
58eb9381 | 1866 | ERR("Viewer conn value %" PRIu32 " before version check", msg_value); |
2f8f53af DG |
1867 | ret = -1; |
1868 | goto end; | |
1869 | } | |
d3e2ba59 | 1870 | |
2f8f53af | 1871 | switch (msg_value) { |
c4e361a4 | 1872 | case LTTNG_VIEWER_CONNECT: |
58eb9381 | 1873 | ret = viewer_connect(conn); |
d3e2ba59 | 1874 | break; |
c4e361a4 | 1875 | case LTTNG_VIEWER_LIST_SESSIONS: |
58eb9381 | 1876 | ret = viewer_list_sessions(conn); |
d3e2ba59 | 1877 | break; |
c4e361a4 | 1878 | case LTTNG_VIEWER_ATTACH_SESSION: |
58eb9381 | 1879 | ret = viewer_attach_session(conn); |
d3e2ba59 | 1880 | break; |
c4e361a4 | 1881 | case LTTNG_VIEWER_GET_NEXT_INDEX: |
58eb9381 | 1882 | ret = viewer_get_next_index(conn); |
d3e2ba59 | 1883 | break; |
c4e361a4 | 1884 | case LTTNG_VIEWER_GET_PACKET: |
58eb9381 | 1885 | ret = viewer_get_packet(conn); |
d3e2ba59 | 1886 | break; |
c4e361a4 | 1887 | case LTTNG_VIEWER_GET_METADATA: |
58eb9381 | 1888 | ret = viewer_get_metadata(conn); |
d3e2ba59 | 1889 | break; |
c4e361a4 | 1890 | case LTTNG_VIEWER_GET_NEW_STREAMS: |
58eb9381 | 1891 | ret = viewer_get_new_streams(conn); |
80e8027a | 1892 | break; |
c3b7390b JD |
1893 | case LTTNG_VIEWER_CREATE_SESSION: |
1894 | ret = viewer_create_session(conn); | |
1895 | break; | |
d62023be JD |
1896 | case LTTNG_VIEWER_DETACH_SESSION: |
1897 | ret = viewer_detach_session(conn); | |
1898 | break; | |
d3e2ba59 | 1899 | default: |
7591bab1 MD |
1900 | ERR("Received unknown viewer command (%u)", |
1901 | be32toh(recv_hdr->cmd)); | |
58eb9381 | 1902 | live_relay_unknown_command(conn); |
d3e2ba59 JD |
1903 | ret = -1; |
1904 | goto end; | |
1905 | } | |
1906 | ||
1907 | end: | |
1908 | return ret; | |
1909 | } | |
1910 | ||
1911 | static | |
58eb9381 | 1912 | void cleanup_connection_pollfd(struct lttng_poll_event *events, int pollfd) |
d3e2ba59 JD |
1913 | { |
1914 | int ret; | |
1915 | ||
58eb9381 | 1916 | (void) lttng_poll_del(events, pollfd); |
d3e2ba59 JD |
1917 | |
1918 | ret = close(pollfd); | |
1919 | if (ret < 0) { | |
1920 | ERR("Closing pollfd %d", pollfd); | |
1921 | } | |
1922 | } | |
1923 | ||
d3e2ba59 JD |
1924 | /* |
1925 | * This thread does the actual work | |
1926 | */ | |
1927 | static | |
1928 | void *thread_worker(void *data) | |
1929 | { | |
1930 | int ret, err = -1; | |
1931 | uint32_t nb_fd; | |
d3e2ba59 | 1932 | struct lttng_poll_event events; |
7591bab1 | 1933 | struct lttng_ht *viewer_connections_ht; |
d3e2ba59 JD |
1934 | struct lttng_ht_iter iter; |
1935 | struct lttng_viewer_cmd recv_hdr; | |
302d8906 | 1936 | struct relay_connection *destroy_conn; |
d3e2ba59 JD |
1937 | |
1938 | DBG("[thread] Live viewer relay worker started"); | |
1939 | ||
1940 | rcu_register_thread(); | |
1941 | ||
eea7556c MD |
1942 | health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_WORKER); |
1943 | ||
9b5e0863 MD |
1944 | if (testpoint(relayd_thread_live_worker)) { |
1945 | goto error_testpoint; | |
1946 | } | |
1947 | ||
d3e2ba59 | 1948 | /* table of connections indexed on socket */ |
7591bab1 MD |
1949 | viewer_connections_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
1950 | if (!viewer_connections_ht) { | |
1951 | goto viewer_connections_ht_error; | |
d3e2ba59 JD |
1952 | } |
1953 | ||
1954 | ret = create_thread_poll_set(&events, 2); | |
1955 | if (ret < 0) { | |
1956 | goto error_poll_create; | |
1957 | } | |
1958 | ||
58eb9381 | 1959 | ret = lttng_poll_add(&events, live_conn_pipe[0], LPOLLIN | LPOLLRDHUP); |
d3e2ba59 JD |
1960 | if (ret < 0) { |
1961 | goto error; | |
1962 | } | |
1963 | ||
1964 | restart: | |
1965 | while (1) { | |
1966 | int i; | |
1967 | ||
eea7556c MD |
1968 | health_code_update(); |
1969 | ||
d3e2ba59 JD |
1970 | /* Infinite blocking call, waiting for transmission */ |
1971 | DBG3("Relayd live viewer worker thread polling..."); | |
eea7556c | 1972 | health_poll_entry(); |
d3e2ba59 | 1973 | ret = lttng_poll_wait(&events, -1); |
eea7556c | 1974 | health_poll_exit(); |
d3e2ba59 JD |
1975 | if (ret < 0) { |
1976 | /* | |
1977 | * Restart interrupted system call. | |
1978 | */ | |
1979 | if (errno == EINTR) { | |
1980 | goto restart; | |
1981 | } | |
1982 | goto error; | |
1983 | } | |
1984 | ||
1985 | nb_fd = ret; | |
1986 | ||
1987 | /* | |
1988 | * Process control. The control connection is prioritised so we don't | |
1989 | * starve it with high throughput tracing data on the data | |
1990 | * connection. | |
1991 | */ | |
1992 | for (i = 0; i < nb_fd; i++) { | |
1993 | /* Fetch once the poll data */ | |
1994 | uint32_t revents = LTTNG_POLL_GETEV(&events, i); | |
1995 | int pollfd = LTTNG_POLL_GETFD(&events, i); | |
1996 | ||
eea7556c MD |
1997 | health_code_update(); |
1998 | ||
fd20dac9 MD |
1999 | if (!revents) { |
2000 | /* No activity for this FD (poll implementation). */ | |
2001 | continue; | |
2002 | } | |
2003 | ||
d3e2ba59 | 2004 | /* Thread quit pipe has been closed. Killing thread. */ |
bcf4a440 | 2005 | ret = check_thread_quit_pipe(pollfd, revents); |
d3e2ba59 JD |
2006 | if (ret) { |
2007 | err = 0; | |
2008 | goto exit; | |
2009 | } | |
2010 | ||
7591bab1 | 2011 | /* Inspect the relay conn pipe for new connection. */ |
58eb9381 | 2012 | if (pollfd == live_conn_pipe[0]) { |
03e43155 | 2013 | if (revents & LPOLLIN) { |
302d8906 JG |
2014 | struct relay_connection *conn; |
2015 | ||
7591bab1 MD |
2016 | ret = lttng_read(live_conn_pipe[0], |
2017 | &conn, sizeof(conn)); | |
d3e2ba59 JD |
2018 | if (ret < 0) { |
2019 | goto error; | |
2020 | } | |
58eb9381 DG |
2021 | lttng_poll_add(&events, conn->sock->fd, |
2022 | LPOLLIN | LPOLLRDHUP); | |
7591bab1 MD |
2023 | connection_ht_add(viewer_connections_ht, conn); |
2024 | DBG("Connection socket %d added to poll", conn->sock->fd); | |
03e43155 MD |
2025 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
2026 | ERR("Relay live pipe error"); | |
2027 | goto error; | |
2028 | } else { | |
2029 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
2030 | goto error; | |
d3e2ba59 | 2031 | } |
58eb9381 | 2032 | } else { |
7591bab1 | 2033 | /* Connection activity. */ |
302d8906 JG |
2034 | struct relay_connection *conn; |
2035 | ||
7591bab1 MD |
2036 | conn = connection_get_by_sock(viewer_connections_ht, pollfd); |
2037 | if (!conn) { | |
2038 | continue; | |
2039 | } | |
58eb9381 | 2040 | |
03e43155 | 2041 | if (revents & LPOLLIN) { |
58eb9381 DG |
2042 | ret = conn->sock->ops->recvmsg(conn->sock, &recv_hdr, |
2043 | sizeof(recv_hdr), 0); | |
d3e2ba59 | 2044 | if (ret <= 0) { |
7591bab1 | 2045 | /* Connection closed. */ |
58eb9381 | 2046 | cleanup_connection_pollfd(&events, pollfd); |
7591bab1 MD |
2047 | /* Put "create" ownership reference. */ |
2048 | connection_put(conn); | |
58eb9381 | 2049 | DBG("Viewer control conn closed with %d", pollfd); |
d3e2ba59 | 2050 | } else { |
58eb9381 | 2051 | ret = process_control(&recv_hdr, conn); |
d3e2ba59 JD |
2052 | if (ret < 0) { |
2053 | /* Clear the session on error. */ | |
58eb9381 | 2054 | cleanup_connection_pollfd(&events, pollfd); |
7591bab1 MD |
2055 | /* Put "create" ownership reference. */ |
2056 | connection_put(conn); | |
d3e2ba59 JD |
2057 | DBG("Viewer connection closed with %d", pollfd); |
2058 | } | |
2059 | } | |
03e43155 MD |
2060 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
2061 | cleanup_connection_pollfd(&events, pollfd); | |
2062 | /* Put "create" ownership reference. */ | |
2063 | connection_put(conn); | |
2064 | } else { | |
2065 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
2066 | connection_put(conn); | |
2067 | goto error; | |
d3e2ba59 | 2068 | } |
7591bab1 MD |
2069 | /* Put local "get_by_sock" reference. */ |
2070 | connection_put(conn); | |
d3e2ba59 JD |
2071 | } |
2072 | } | |
2073 | } | |
2074 | ||
2075 | exit: | |
2076 | error: | |
2077 | lttng_poll_clean(&events); | |
2078 | ||
58eb9381 | 2079 | /* Cleanup reamaining connection object. */ |
d3e2ba59 | 2080 | rcu_read_lock(); |
7591bab1 | 2081 | cds_lfht_for_each_entry(viewer_connections_ht->ht, &iter.iter, |
302d8906 | 2082 | destroy_conn, |
58eb9381 | 2083 | sock_n.node) { |
eea7556c | 2084 | health_code_update(); |
7591bab1 | 2085 | connection_put(destroy_conn); |
d3e2ba59 JD |
2086 | } |
2087 | rcu_read_unlock(); | |
2088 | error_poll_create: | |
7591bab1 MD |
2089 | lttng_ht_destroy(viewer_connections_ht); |
2090 | viewer_connections_ht_error: | |
58eb9381 DG |
2091 | /* Close relay conn pipes */ |
2092 | utils_close_pipe(live_conn_pipe); | |
d3e2ba59 JD |
2093 | if (err) { |
2094 | DBG("Viewer worker thread exited with error"); | |
2095 | } | |
2096 | DBG("Viewer worker thread cleanup complete"); | |
9b5e0863 | 2097 | error_testpoint: |
eea7556c MD |
2098 | if (err) { |
2099 | health_error(); | |
2100 | ERR("Health error occurred in %s", __func__); | |
2101 | } | |
2102 | health_unregister(health_relayd); | |
b4aacfdc MD |
2103 | if (lttng_relay_stop_threads()) { |
2104 | ERR("Error stopping threads"); | |
178a0557 | 2105 | } |
d3e2ba59 JD |
2106 | rcu_unregister_thread(); |
2107 | return NULL; | |
2108 | } | |
2109 | ||
2110 | /* | |
2111 | * Create the relay command pipe to wake thread_manage_apps. | |
2112 | * Closed in cleanup(). | |
2113 | */ | |
58eb9381 | 2114 | static int create_conn_pipe(void) |
d3e2ba59 | 2115 | { |
178a0557 MD |
2116 | return utils_create_pipe_cloexec(live_conn_pipe); |
2117 | } | |
d3e2ba59 | 2118 | |
178a0557 | 2119 | int relayd_live_join(void) |
d3e2ba59 | 2120 | { |
178a0557 | 2121 | int ret, retval = 0; |
d3e2ba59 JD |
2122 | void *status; |
2123 | ||
d3e2ba59 | 2124 | ret = pthread_join(live_listener_thread, &status); |
178a0557 MD |
2125 | if (ret) { |
2126 | errno = ret; | |
d3e2ba59 | 2127 | PERROR("pthread_join live listener"); |
178a0557 | 2128 | retval = -1; |
d3e2ba59 JD |
2129 | } |
2130 | ||
2131 | ret = pthread_join(live_worker_thread, &status); | |
178a0557 MD |
2132 | if (ret) { |
2133 | errno = ret; | |
d3e2ba59 | 2134 | PERROR("pthread_join live worker"); |
178a0557 | 2135 | retval = -1; |
d3e2ba59 JD |
2136 | } |
2137 | ||
2138 | ret = pthread_join(live_dispatcher_thread, &status); | |
178a0557 MD |
2139 | if (ret) { |
2140 | errno = ret; | |
d3e2ba59 | 2141 | PERROR("pthread_join live dispatcher"); |
178a0557 | 2142 | retval = -1; |
d3e2ba59 JD |
2143 | } |
2144 | ||
178a0557 | 2145 | cleanup_relayd_live(); |
d3e2ba59 | 2146 | |
178a0557 | 2147 | return retval; |
d3e2ba59 JD |
2148 | } |
2149 | ||
2150 | /* | |
2151 | * main | |
2152 | */ | |
7591bab1 | 2153 | int relayd_live_create(struct lttng_uri *uri) |
d3e2ba59 | 2154 | { |
178a0557 | 2155 | int ret = 0, retval = 0; |
d3e2ba59 JD |
2156 | void *status; |
2157 | int is_root; | |
2158 | ||
178a0557 MD |
2159 | if (!uri) { |
2160 | retval = -1; | |
2161 | goto exit_init_data; | |
2162 | } | |
d3e2ba59 JD |
2163 | live_uri = uri; |
2164 | ||
d3e2ba59 JD |
2165 | /* Check if daemon is UID = 0 */ |
2166 | is_root = !getuid(); | |
2167 | ||
2168 | if (!is_root) { | |
2169 | if (live_uri->port < 1024) { | |
2170 | ERR("Need to be root to use ports < 1024"); | |
178a0557 MD |
2171 | retval = -1; |
2172 | goto exit_init_data; | |
d3e2ba59 JD |
2173 | } |
2174 | } | |
2175 | ||
2176 | /* Setup the thread apps communication pipe. */ | |
178a0557 MD |
2177 | if (create_conn_pipe()) { |
2178 | retval = -1; | |
2179 | goto exit_init_data; | |
d3e2ba59 JD |
2180 | } |
2181 | ||
2182 | /* Init relay command queue. */ | |
8bdee6e2 | 2183 | cds_wfcq_init(&viewer_conn_queue.head, &viewer_conn_queue.tail); |
d3e2ba59 JD |
2184 | |
2185 | /* Set up max poll set size */ | |
25b397f9 MD |
2186 | if (lttng_poll_set_max_size()) { |
2187 | retval = -1; | |
2188 | goto exit_init_data; | |
2189 | } | |
d3e2ba59 JD |
2190 | |
2191 | /* Setup the dispatcher thread */ | |
1a1a34b4 | 2192 | ret = pthread_create(&live_dispatcher_thread, default_pthread_attr(), |
d3e2ba59 | 2193 | thread_dispatcher, (void *) NULL); |
178a0557 MD |
2194 | if (ret) { |
2195 | errno = ret; | |
d3e2ba59 | 2196 | PERROR("pthread_create viewer dispatcher"); |
178a0557 MD |
2197 | retval = -1; |
2198 | goto exit_dispatcher_thread; | |
d3e2ba59 JD |
2199 | } |
2200 | ||
2201 | /* Setup the worker thread */ | |
1a1a34b4 | 2202 | ret = pthread_create(&live_worker_thread, default_pthread_attr(), |
7591bab1 | 2203 | thread_worker, NULL); |
178a0557 MD |
2204 | if (ret) { |
2205 | errno = ret; | |
d3e2ba59 | 2206 | PERROR("pthread_create viewer worker"); |
178a0557 MD |
2207 | retval = -1; |
2208 | goto exit_worker_thread; | |
d3e2ba59 JD |
2209 | } |
2210 | ||
2211 | /* Setup the listener thread */ | |
1a1a34b4 | 2212 | ret = pthread_create(&live_listener_thread, default_pthread_attr(), |
d3e2ba59 | 2213 | thread_listener, (void *) NULL); |
178a0557 MD |
2214 | if (ret) { |
2215 | errno = ret; | |
d3e2ba59 | 2216 | PERROR("pthread_create viewer listener"); |
178a0557 MD |
2217 | retval = -1; |
2218 | goto exit_listener_thread; | |
d3e2ba59 JD |
2219 | } |
2220 | ||
178a0557 MD |
2221 | /* |
2222 | * All OK, started all threads. | |
2223 | */ | |
2224 | return retval; | |
2225 | ||
9911d21b JG |
2226 | /* |
2227 | * Join on the live_listener_thread should anything be added after | |
2228 | * the live_listener thread's creation. | |
2229 | */ | |
d3e2ba59 | 2230 | |
178a0557 | 2231 | exit_listener_thread: |
d3e2ba59 | 2232 | |
d3e2ba59 | 2233 | ret = pthread_join(live_worker_thread, &status); |
178a0557 MD |
2234 | if (ret) { |
2235 | errno = ret; | |
d3e2ba59 | 2236 | PERROR("pthread_join live worker"); |
178a0557 | 2237 | retval = -1; |
d3e2ba59 | 2238 | } |
178a0557 | 2239 | exit_worker_thread: |
d3e2ba59 | 2240 | |
d3e2ba59 | 2241 | ret = pthread_join(live_dispatcher_thread, &status); |
178a0557 MD |
2242 | if (ret) { |
2243 | errno = ret; | |
d3e2ba59 | 2244 | PERROR("pthread_join live dispatcher"); |
178a0557 | 2245 | retval = -1; |
d3e2ba59 | 2246 | } |
178a0557 | 2247 | exit_dispatcher_thread: |
d3e2ba59 | 2248 | |
178a0557 MD |
2249 | exit_init_data: |
2250 | cleanup_relayd_live(); | |
d3e2ba59 | 2251 | |
178a0557 | 2252 | return retval; |
d3e2ba59 | 2253 | } |