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> | |
590e9039 | 56 | #include <common/fd-tracker/utils.h> |
d3e2ba59 JD |
57 | |
58 | #include "cmd.h" | |
59 | #include "live.h" | |
60 | #include "lttng-relayd.h" | |
d3e2ba59 | 61 | #include "utils.h" |
eea7556c | 62 | #include "health-relayd.h" |
9b5e0863 | 63 | #include "testpoint.h" |
2f8f53af | 64 | #include "viewer-stream.h" |
2a174661 DG |
65 | #include "stream.h" |
66 | #include "session.h" | |
67 | #include "ctf-trace.h" | |
58eb9381 | 68 | #include "connection.h" |
7591bab1 MD |
69 | #include "viewer-session.h" |
70 | ||
71 | #define SESSION_BUF_DEFAULT_COUNT 16 | |
d3e2ba59 JD |
72 | |
73 | static struct lttng_uri *live_uri; | |
74 | ||
d3e2ba59 JD |
75 | /* |
76 | * This pipe is used to inform the worker thread that a command is queued and | |
77 | * ready to be processed. | |
78 | */ | |
58eb9381 | 79 | static int live_conn_pipe[2] = { -1, -1 }; |
d3e2ba59 JD |
80 | |
81 | /* Shared between threads */ | |
82 | static int live_dispatch_thread_exit; | |
83 | ||
84 | static pthread_t live_listener_thread; | |
85 | static pthread_t live_dispatcher_thread; | |
86 | static pthread_t live_worker_thread; | |
87 | ||
88 | /* | |
89 | * Relay command queue. | |
90 | * | |
91 | * The live_thread_listener and live_thread_dispatcher communicate with this | |
92 | * queue. | |
93 | */ | |
58eb9381 | 94 | static struct relay_conn_queue viewer_conn_queue; |
d3e2ba59 JD |
95 | |
96 | static uint64_t last_relay_viewer_session_id; | |
7591bab1 MD |
97 | static pthread_mutex_t last_relay_viewer_session_id_lock = |
98 | PTHREAD_MUTEX_INITIALIZER; | |
d3e2ba59 JD |
99 | |
100 | /* | |
101 | * Cleanup the daemon | |
102 | */ | |
103 | static | |
178a0557 | 104 | void cleanup_relayd_live(void) |
d3e2ba59 JD |
105 | { |
106 | DBG("Cleaning up"); | |
107 | ||
d3e2ba59 JD |
108 | free(live_uri); |
109 | } | |
110 | ||
2f8f53af DG |
111 | /* |
112 | * Receive a request buffer using a given socket, destination allocated buffer | |
113 | * of length size. | |
114 | * | |
115 | * Return the size of the received message or else a negative value on error | |
116 | * with errno being set by recvmsg() syscall. | |
117 | */ | |
118 | static | |
119 | ssize_t recv_request(struct lttcomm_sock *sock, void *buf, size_t size) | |
120 | { | |
121 | ssize_t ret; | |
122 | ||
2f8f53af DG |
123 | ret = sock->ops->recvmsg(sock, buf, size, 0); |
124 | if (ret < 0 || ret != size) { | |
125 | if (ret == 0) { | |
126 | /* Orderly shutdown. Not necessary to print an error. */ | |
127 | DBG("Socket %d did an orderly shutdown", sock->fd); | |
128 | } else { | |
129 | ERR("Relay failed to receive request."); | |
130 | } | |
131 | ret = -1; | |
132 | } | |
133 | ||
134 | return ret; | |
135 | } | |
136 | ||
137 | /* | |
138 | * Send a response buffer using a given socket, source allocated buffer of | |
139 | * length size. | |
140 | * | |
141 | * Return the size of the sent message or else a negative value on error with | |
142 | * errno being set by sendmsg() syscall. | |
143 | */ | |
144 | static | |
145 | ssize_t send_response(struct lttcomm_sock *sock, void *buf, size_t size) | |
146 | { | |
147 | ssize_t ret; | |
148 | ||
2f8f53af DG |
149 | ret = sock->ops->sendmsg(sock, buf, size, 0); |
150 | if (ret < 0) { | |
151 | ERR("Relayd failed to send response."); | |
152 | } | |
153 | ||
154 | return ret; | |
155 | } | |
156 | ||
157 | /* | |
f04a971b JD |
158 | * Atomically check if new streams got added in one of the sessions attached |
159 | * and reset the flag to 0. | |
2f8f53af DG |
160 | * |
161 | * Returns 1 if new streams got added, 0 if nothing changed, a negative value | |
162 | * on error. | |
163 | */ | |
164 | static | |
f04a971b | 165 | int check_new_streams(struct relay_connection *conn) |
2f8f53af | 166 | { |
2f8f53af | 167 | struct relay_session *session; |
f04a971b JD |
168 | unsigned long current_val; |
169 | int ret = 0; | |
2f8f53af | 170 | |
f04a971b JD |
171 | if (!conn->viewer_session) { |
172 | goto end; | |
173 | } | |
7591bab1 MD |
174 | rcu_read_lock(); |
175 | cds_list_for_each_entry_rcu(session, | |
176 | &conn->viewer_session->session_list, | |
177 | viewer_session_node) { | |
178 | if (!session_get(session)) { | |
179 | continue; | |
180 | } | |
f04a971b JD |
181 | current_val = uatomic_cmpxchg(&session->new_streams, 1, 0); |
182 | ret = current_val; | |
7591bab1 | 183 | session_put(session); |
f04a971b JD |
184 | if (ret == 1) { |
185 | goto end; | |
186 | } | |
2f8f53af | 187 | } |
f04a971b | 188 | end: |
7591bab1 | 189 | rcu_read_unlock(); |
2f8f53af DG |
190 | return ret; |
191 | } | |
192 | ||
193 | /* | |
194 | * Send viewer streams to the given socket. The ignore_sent_flag indicates if | |
195 | * this function should ignore the sent flag or not. | |
196 | * | |
197 | * Return 0 on success or else a negative value. | |
198 | */ | |
199 | static | |
200 | ssize_t send_viewer_streams(struct lttcomm_sock *sock, | |
201 | struct relay_session *session, unsigned int ignore_sent_flag) | |
202 | { | |
203 | ssize_t ret; | |
204 | struct lttng_viewer_stream send_stream; | |
205 | struct lttng_ht_iter iter; | |
206 | struct relay_viewer_stream *vstream; | |
207 | ||
2f8f53af DG |
208 | rcu_read_lock(); |
209 | ||
210 | cds_lfht_for_each_entry(viewer_streams_ht->ht, &iter.iter, vstream, | |
211 | stream_n.node) { | |
2a174661 DG |
212 | struct ctf_trace *ctf_trace; |
213 | ||
2f8f53af DG |
214 | health_code_update(); |
215 | ||
7591bab1 MD |
216 | if (!viewer_stream_get(vstream)) { |
217 | continue; | |
218 | } | |
219 | ||
220 | pthread_mutex_lock(&vstream->stream->lock); | |
2f8f53af | 221 | /* Ignore if not the same session. */ |
7591bab1 | 222 | if (vstream->stream->trace->session->id != session->id || |
2f8f53af | 223 | (!ignore_sent_flag && vstream->sent_flag)) { |
7591bab1 MD |
224 | pthread_mutex_unlock(&vstream->stream->lock); |
225 | viewer_stream_put(vstream); | |
2f8f53af DG |
226 | continue; |
227 | } | |
228 | ||
7591bab1 MD |
229 | ctf_trace = vstream->stream->trace; |
230 | send_stream.id = htobe64(vstream->stream->stream_handle); | |
2a174661 | 231 | send_stream.ctf_trace_id = htobe64(ctf_trace->id); |
7591bab1 MD |
232 | send_stream.metadata_flag = htobe32( |
233 | vstream->stream->is_metadata); | |
f8f011fb MD |
234 | if (lttng_strncpy(send_stream.path_name, vstream->path_name, |
235 | sizeof(send_stream.path_name))) { | |
236 | pthread_mutex_unlock(&vstream->stream->lock); | |
237 | viewer_stream_put(vstream); | |
238 | ret = -1; /* Error. */ | |
239 | goto end_unlock; | |
240 | } | |
241 | if (lttng_strncpy(send_stream.channel_name, | |
242 | vstream->channel_name, | |
243 | sizeof(send_stream.channel_name))) { | |
244 | pthread_mutex_unlock(&vstream->stream->lock); | |
245 | viewer_stream_put(vstream); | |
246 | ret = -1; /* Error. */ | |
247 | goto end_unlock; | |
248 | } | |
2f8f53af | 249 | |
7591bab1 MD |
250 | DBG("Sending stream %" PRIu64 " to viewer", |
251 | vstream->stream->stream_handle); | |
252 | vstream->sent_flag = 1; | |
253 | pthread_mutex_unlock(&vstream->stream->lock); | |
254 | ||
2f8f53af | 255 | ret = send_response(sock, &send_stream, sizeof(send_stream)); |
7591bab1 | 256 | viewer_stream_put(vstream); |
2f8f53af DG |
257 | if (ret < 0) { |
258 | goto end_unlock; | |
259 | } | |
2f8f53af DG |
260 | } |
261 | ||
262 | ret = 0; | |
263 | ||
264 | end_unlock: | |
265 | rcu_read_unlock(); | |
266 | return ret; | |
267 | } | |
268 | ||
269 | /* | |
270 | * Create every viewer stream possible for the given session with the seek | |
271 | * type. Three counters *can* be return which are in order the total amount of | |
272 | * viewer stream of the session, the number of unsent stream and the number of | |
273 | * stream created. Those counters can be NULL and thus will be ignored. | |
274 | * | |
275 | * Return 0 on success or else a negative value. | |
276 | */ | |
277 | static | |
278 | int make_viewer_streams(struct relay_session *session, | |
279 | enum lttng_viewer_seek seek_t, uint32_t *nb_total, uint32_t *nb_unsent, | |
bddf80e4 | 280 | uint32_t *nb_created, bool *closed) |
2f8f53af DG |
281 | { |
282 | int ret; | |
2f8f53af | 283 | struct lttng_ht_iter iter; |
2a174661 | 284 | struct ctf_trace *ctf_trace; |
2f8f53af DG |
285 | |
286 | assert(session); | |
287 | ||
288 | /* | |
7591bab1 MD |
289 | * Hold the session lock to ensure that we see either none or |
290 | * all initial streams for a session, but no intermediate state. | |
2f8f53af | 291 | */ |
7591bab1 | 292 | pthread_mutex_lock(&session->lock); |
2f8f53af | 293 | |
bddf80e4 MD |
294 | if (session->connection_closed) { |
295 | *closed = true; | |
296 | } | |
297 | ||
2f8f53af | 298 | /* |
7591bab1 MD |
299 | * Create viewer streams for relay streams that are ready to be |
300 | * used for a the given session id only. | |
2f8f53af | 301 | */ |
2a174661 DG |
302 | rcu_read_lock(); |
303 | cds_lfht_for_each_entry(session->ctf_traces_ht->ht, &iter.iter, ctf_trace, | |
304 | node.node) { | |
305 | struct relay_stream *stream; | |
2f8f53af DG |
306 | |
307 | health_code_update(); | |
308 | ||
7591bab1 | 309 | if (!ctf_trace_get(ctf_trace)) { |
2f8f53af DG |
310 | continue; |
311 | } | |
312 | ||
7591bab1 | 313 | cds_list_for_each_entry_rcu(stream, &ctf_trace->stream_list, stream_node) { |
2a174661 DG |
314 | struct relay_viewer_stream *vstream; |
315 | ||
7591bab1 | 316 | if (!stream_get(stream)) { |
2a174661 DG |
317 | continue; |
318 | } | |
7591bab1 | 319 | /* |
d812ecb9 | 320 | * stream published is protected by the session lock. |
7591bab1 MD |
321 | */ |
322 | if (!stream->published) { | |
323 | goto next; | |
324 | } | |
325 | vstream = viewer_stream_get_by_id(stream->stream_handle); | |
2f8f53af | 326 | if (!vstream) { |
7591bab1 | 327 | vstream = viewer_stream_create(stream, seek_t); |
2a174661 DG |
328 | if (!vstream) { |
329 | ret = -1; | |
7591bab1 MD |
330 | ctf_trace_put(ctf_trace); |
331 | stream_put(stream); | |
2a174661 DG |
332 | goto error_unlock; |
333 | } | |
2a174661 DG |
334 | |
335 | if (nb_created) { | |
336 | /* Update number of created stream counter. */ | |
337 | (*nb_created)++; | |
338 | } | |
2229a09c MD |
339 | /* |
340 | * Ensure a self-reference is preserved even | |
341 | * after we have put our local reference. | |
342 | */ | |
862d3a3b MD |
343 | if (!viewer_stream_get(vstream)) { |
344 | ERR("Unable to get self-reference on viewer stream, logic error."); | |
345 | abort(); | |
346 | } | |
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 | ||
378 | error_unlock: | |
2a174661 | 379 | rcu_read_unlock(); |
7591bab1 | 380 | pthread_mutex_unlock(&session->lock); |
2f8f53af DG |
381 | return ret; |
382 | } | |
383 | ||
b4aacfdc | 384 | int 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 JD |
392 | /* |
393 | * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set. | |
394 | */ | |
395 | static | |
396 | int 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 | ||
418 | error: | |
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 | */ | |
427 | static | |
bcf4a440 | 428 | int 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 | */ | |
440 | static | |
441 | struct 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 | ||
471 | error: | |
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 | */ | |
481 | static | |
482 | void *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 | ||
523 | restart: | |
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 | ||
03e43155 | 558 | if (revents & LPOLLIN) { |
d3e2ba59 | 559 | /* |
7591bab1 MD |
560 | * A new connection is requested, therefore a |
561 | * viewer connection is allocated in this | |
562 | * thread, enqueued to a global queue and | |
563 | * dequeued (and freed) in the worker thread. | |
d3e2ba59 | 564 | */ |
58eb9381 DG |
565 | int val = 1; |
566 | struct relay_connection *new_conn; | |
d3e2ba59 JD |
567 | struct lttcomm_sock *newsock; |
568 | ||
d3e2ba59 JD |
569 | newsock = live_control_sock->ops->accept(live_control_sock); |
570 | if (!newsock) { | |
571 | PERROR("accepting control sock"); | |
d3e2ba59 JD |
572 | goto error; |
573 | } | |
574 | DBG("Relay viewer connection accepted socket %d", newsock->fd); | |
58eb9381 | 575 | |
d3e2ba59 | 576 | ret = setsockopt(newsock->fd, SOL_SOCKET, SO_REUSEADDR, &val, |
58eb9381 | 577 | sizeof(val)); |
d3e2ba59 JD |
578 | if (ret < 0) { |
579 | PERROR("setsockopt inet"); | |
580 | lttcomm_destroy_sock(newsock); | |
d3e2ba59 JD |
581 | goto error; |
582 | } | |
7591bab1 MD |
583 | new_conn = connection_create(newsock, RELAY_CONNECTION_UNKNOWN); |
584 | if (!new_conn) { | |
585 | lttcomm_destroy_sock(newsock); | |
586 | goto error; | |
587 | } | |
588 | /* Ownership assumed by the connection. */ | |
589 | newsock = NULL; | |
d3e2ba59 | 590 | |
58eb9381 | 591 | /* Enqueue request for the dispatcher thread. */ |
8bdee6e2 SM |
592 | cds_wfcq_enqueue(&viewer_conn_queue.head, &viewer_conn_queue.tail, |
593 | &new_conn->qnode); | |
d3e2ba59 JD |
594 | |
595 | /* | |
7591bab1 MD |
596 | * Wake the dispatch queue futex. |
597 | * Implicit memory barrier with the | |
598 | * exchange in cds_wfcq_enqueue. | |
d3e2ba59 | 599 | */ |
58eb9381 | 600 | futex_nto1_wake(&viewer_conn_queue.futex); |
03e43155 MD |
601 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
602 | ERR("socket poll error"); | |
603 | goto error; | |
604 | } else { | |
605 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
606 | goto error; | |
d3e2ba59 JD |
607 | } |
608 | } | |
609 | } | |
610 | ||
611 | exit: | |
612 | error: | |
613 | error_poll_add: | |
9b5e0863 | 614 | error_testpoint: |
d3e2ba59 JD |
615 | lttng_poll_clean(&events); |
616 | error_create_poll: | |
617 | if (live_control_sock->fd >= 0) { | |
618 | ret = live_control_sock->ops->close(live_control_sock); | |
619 | if (ret) { | |
620 | PERROR("close"); | |
621 | } | |
622 | } | |
623 | lttcomm_destroy_sock(live_control_sock); | |
624 | error_sock_control: | |
625 | if (err) { | |
eea7556c | 626 | health_error(); |
d3e2ba59 JD |
627 | DBG("Live viewer listener thread exited with error"); |
628 | } | |
eea7556c | 629 | health_unregister(health_relayd); |
d3e2ba59 | 630 | DBG("Live viewer listener thread cleanup complete"); |
b4aacfdc MD |
631 | if (lttng_relay_stop_threads()) { |
632 | ERR("Error stopping threads"); | |
178a0557 | 633 | } |
d3e2ba59 JD |
634 | return NULL; |
635 | } | |
636 | ||
637 | /* | |
638 | * This thread manages the dispatching of the requests to worker threads | |
639 | */ | |
640 | static | |
641 | void *thread_dispatcher(void *data) | |
642 | { | |
6cd525e8 MD |
643 | int err = -1; |
644 | ssize_t ret; | |
8bdee6e2 | 645 | struct cds_wfcq_node *node; |
58eb9381 | 646 | struct relay_connection *conn = NULL; |
d3e2ba59 JD |
647 | |
648 | DBG("[thread] Live viewer relay dispatcher started"); | |
649 | ||
eea7556c MD |
650 | health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_DISPATCHER); |
651 | ||
9b5e0863 MD |
652 | if (testpoint(relayd_thread_live_dispatcher)) { |
653 | goto error_testpoint; | |
654 | } | |
655 | ||
eea7556c MD |
656 | health_code_update(); |
657 | ||
68924dc1 | 658 | for (;;) { |
eea7556c MD |
659 | health_code_update(); |
660 | ||
d3e2ba59 | 661 | /* Atomically prepare the queue futex */ |
58eb9381 | 662 | futex_nto1_prepare(&viewer_conn_queue.futex); |
d3e2ba59 | 663 | |
68924dc1 MD |
664 | if (CMM_LOAD_SHARED(live_dispatch_thread_exit)) { |
665 | break; | |
666 | } | |
667 | ||
d3e2ba59 | 668 | do { |
eea7556c MD |
669 | health_code_update(); |
670 | ||
d3e2ba59 | 671 | /* Dequeue commands */ |
8bdee6e2 SM |
672 | node = cds_wfcq_dequeue_blocking(&viewer_conn_queue.head, |
673 | &viewer_conn_queue.tail); | |
d3e2ba59 JD |
674 | if (node == NULL) { |
675 | DBG("Woken up but nothing in the live-viewer " | |
676 | "relay command queue"); | |
677 | /* Continue thread execution */ | |
678 | break; | |
679 | } | |
58eb9381 | 680 | conn = caa_container_of(node, struct relay_connection, qnode); |
d3e2ba59 | 681 | DBG("Dispatching viewer request waiting on sock %d", |
58eb9381 | 682 | conn->sock->fd); |
d3e2ba59 JD |
683 | |
684 | /* | |
7591bab1 MD |
685 | * Inform worker thread of the new request. This |
686 | * call is blocking so we can be assured that | |
687 | * the data will be read at some point in time | |
688 | * or wait to the end of the world :) | |
d3e2ba59 | 689 | */ |
58eb9381 DG |
690 | ret = lttng_write(live_conn_pipe[1], &conn, sizeof(conn)); |
691 | if (ret < 0) { | |
692 | PERROR("write conn pipe"); | |
7591bab1 | 693 | connection_put(conn); |
d3e2ba59 JD |
694 | goto error; |
695 | } | |
696 | } while (node != NULL); | |
697 | ||
698 | /* Futex wait on queue. Blocking call on futex() */ | |
eea7556c | 699 | health_poll_entry(); |
58eb9381 | 700 | futex_nto1_wait(&viewer_conn_queue.futex); |
eea7556c | 701 | health_poll_exit(); |
d3e2ba59 JD |
702 | } |
703 | ||
eea7556c MD |
704 | /* Normal exit, no error */ |
705 | err = 0; | |
706 | ||
d3e2ba59 | 707 | error: |
9b5e0863 | 708 | error_testpoint: |
eea7556c MD |
709 | if (err) { |
710 | health_error(); | |
711 | ERR("Health error occurred in %s", __func__); | |
712 | } | |
713 | health_unregister(health_relayd); | |
d3e2ba59 | 714 | DBG("Live viewer dispatch thread dying"); |
b4aacfdc MD |
715 | if (lttng_relay_stop_threads()) { |
716 | ERR("Error stopping threads"); | |
178a0557 | 717 | } |
d3e2ba59 JD |
718 | return NULL; |
719 | } | |
720 | ||
721 | /* | |
722 | * Establish connection with the viewer and check the versions. | |
723 | * | |
724 | * Return 0 on success or else negative value. | |
725 | */ | |
726 | static | |
58eb9381 | 727 | int viewer_connect(struct relay_connection *conn) |
d3e2ba59 JD |
728 | { |
729 | int ret; | |
730 | struct lttng_viewer_connect reply, msg; | |
731 | ||
58eb9381 | 732 | conn->version_check_done = 1; |
d3e2ba59 | 733 | |
eea7556c MD |
734 | health_code_update(); |
735 | ||
2f8f53af DG |
736 | DBG("Viewer is establishing a connection to the relayd."); |
737 | ||
58eb9381 | 738 | ret = recv_request(conn->sock, &msg, sizeof(msg)); |
2f8f53af | 739 | if (ret < 0) { |
d3e2ba59 JD |
740 | goto end; |
741 | } | |
742 | ||
eea7556c MD |
743 | health_code_update(); |
744 | ||
f46b2ce6 | 745 | memset(&reply, 0, sizeof(reply)); |
d3e2ba59 JD |
746 | reply.major = RELAYD_VERSION_COMM_MAJOR; |
747 | reply.minor = RELAYD_VERSION_COMM_MINOR; | |
748 | ||
749 | /* Major versions must be the same */ | |
750 | if (reply.major != be32toh(msg.major)) { | |
2f8f53af DG |
751 | DBG("Incompatible major versions ([relayd] %u vs [client] %u)", |
752 | reply.major, be32toh(msg.major)); | |
72180669 | 753 | ret = -1; |
d3e2ba59 JD |
754 | goto end; |
755 | } | |
756 | ||
58eb9381 | 757 | conn->major = reply.major; |
d3e2ba59 JD |
758 | /* We adapt to the lowest compatible version */ |
759 | if (reply.minor <= be32toh(msg.minor)) { | |
58eb9381 | 760 | conn->minor = reply.minor; |
d3e2ba59 | 761 | } else { |
58eb9381 | 762 | conn->minor = be32toh(msg.minor); |
d3e2ba59 JD |
763 | } |
764 | ||
c4e361a4 | 765 | if (be32toh(msg.type) == LTTNG_VIEWER_CLIENT_COMMAND) { |
58eb9381 | 766 | conn->type = RELAY_VIEWER_COMMAND; |
c4e361a4 | 767 | } else if (be32toh(msg.type) == LTTNG_VIEWER_CLIENT_NOTIFICATION) { |
58eb9381 | 768 | conn->type = RELAY_VIEWER_NOTIFICATION; |
d3e2ba59 JD |
769 | } else { |
770 | ERR("Unknown connection type : %u", be32toh(msg.type)); | |
771 | ret = -1; | |
772 | goto end; | |
773 | } | |
774 | ||
775 | reply.major = htobe32(reply.major); | |
776 | reply.minor = htobe32(reply.minor); | |
58eb9381 | 777 | if (conn->type == RELAY_VIEWER_COMMAND) { |
93b4787b | 778 | /* |
7591bab1 MD |
779 | * Increment outside of htobe64 macro, because the argument can |
780 | * be used more than once within the macro, and thus the | |
781 | * operation may be undefined. | |
93b4787b | 782 | */ |
7591bab1 | 783 | pthread_mutex_lock(&last_relay_viewer_session_id_lock); |
93b4787b | 784 | last_relay_viewer_session_id++; |
7591bab1 | 785 | pthread_mutex_unlock(&last_relay_viewer_session_id_lock); |
93b4787b | 786 | reply.viewer_session_id = htobe64(last_relay_viewer_session_id); |
d3e2ba59 | 787 | } |
eea7556c MD |
788 | |
789 | health_code_update(); | |
790 | ||
58eb9381 | 791 | ret = send_response(conn->sock, &reply, sizeof(reply)); |
d3e2ba59 | 792 | if (ret < 0) { |
2f8f53af | 793 | goto end; |
d3e2ba59 JD |
794 | } |
795 | ||
eea7556c MD |
796 | health_code_update(); |
797 | ||
58eb9381 | 798 | DBG("Version check done using protocol %u.%u", conn->major, conn->minor); |
d3e2ba59 JD |
799 | ret = 0; |
800 | ||
801 | end: | |
802 | return ret; | |
803 | } | |
804 | ||
805 | /* | |
806 | * Send the viewer the list of current sessions. | |
7591bab1 MD |
807 | * We need to create a copy of the hash table content because otherwise |
808 | * we cannot assume the number of entries stays the same between getting | |
809 | * the number of HT elements and iteration over the HT. | |
d3e2ba59 JD |
810 | * |
811 | * Return 0 on success or else a negative value. | |
812 | */ | |
813 | static | |
58eb9381 | 814 | int viewer_list_sessions(struct relay_connection *conn) |
d3e2ba59 | 815 | { |
5f10c6b1 | 816 | int ret = 0; |
d3e2ba59 | 817 | struct lttng_viewer_list_sessions session_list; |
d3e2ba59 | 818 | struct lttng_ht_iter iter; |
d3e2ba59 | 819 | struct relay_session *session; |
7591bab1 MD |
820 | struct lttng_viewer_session *send_session_buf = NULL; |
821 | uint32_t buf_count = SESSION_BUF_DEFAULT_COUNT; | |
822 | uint32_t count = 0; | |
d3e2ba59 JD |
823 | |
824 | DBG("List sessions received"); | |
825 | ||
7591bab1 MD |
826 | send_session_buf = zmalloc(SESSION_BUF_DEFAULT_COUNT * sizeof(*send_session_buf)); |
827 | if (!send_session_buf) { | |
828 | return -1; | |
d3e2ba59 JD |
829 | } |
830 | ||
7591bab1 MD |
831 | rcu_read_lock(); |
832 | cds_lfht_for_each_entry(sessions_ht->ht, &iter.iter, session, | |
2f8f53af | 833 | session_n.node) { |
7591bab1 | 834 | struct lttng_viewer_session *send_session; |
d3e2ba59 | 835 | |
eea7556c MD |
836 | health_code_update(); |
837 | ||
7591bab1 MD |
838 | if (count >= buf_count) { |
839 | struct lttng_viewer_session *newbuf; | |
840 | uint32_t new_buf_count = buf_count << 1; | |
eea7556c | 841 | |
7591bab1 MD |
842 | newbuf = realloc(send_session_buf, |
843 | new_buf_count * sizeof(*send_session_buf)); | |
844 | if (!newbuf) { | |
845 | ret = -1; | |
5f10c6b1 | 846 | break; |
7591bab1 MD |
847 | } |
848 | send_session_buf = newbuf; | |
849 | buf_count = new_buf_count; | |
6763619c | 850 | } |
7591bab1 | 851 | send_session = &send_session_buf[count]; |
bfc3fb17 MD |
852 | if (lttng_strncpy(send_session->session_name, |
853 | session->session_name, | |
854 | sizeof(send_session->session_name))) { | |
855 | ret = -1; | |
5f10c6b1 | 856 | break; |
bfc3fb17 MD |
857 | } |
858 | if (lttng_strncpy(send_session->hostname, session->hostname, | |
859 | sizeof(send_session->hostname))) { | |
860 | ret = -1; | |
5f10c6b1 | 861 | break; |
bfc3fb17 | 862 | } |
7591bab1 MD |
863 | send_session->id = htobe64(session->id); |
864 | send_session->live_timer = htobe32(session->live_timer); | |
865 | if (session->viewer_attached) { | |
866 | send_session->clients = htobe32(1); | |
867 | } else { | |
868 | send_session->clients = htobe32(0); | |
d227d5bd | 869 | } |
7591bab1 MD |
870 | send_session->streams = htobe32(session->stream_count); |
871 | count++; | |
872 | } | |
873 | rcu_read_unlock(); | |
5f10c6b1 JG |
874 | if (ret < 0) { |
875 | goto end_free; | |
876 | } | |
d227d5bd | 877 | |
7591bab1 | 878 | session_list.sessions_count = htobe32(count); |
d227d5bd | 879 | |
7591bab1 | 880 | health_code_update(); |
d227d5bd | 881 | |
7591bab1 MD |
882 | ret = send_response(conn->sock, &session_list, sizeof(session_list)); |
883 | if (ret < 0) { | |
884 | goto end_free; | |
d227d5bd | 885 | } |
d227d5bd | 886 | |
7591bab1 | 887 | health_code_update(); |
d227d5bd | 888 | |
7591bab1 MD |
889 | ret = send_response(conn->sock, send_session_buf, |
890 | count * sizeof(*send_session_buf)); | |
891 | if (ret < 0) { | |
892 | goto end_free; | |
d227d5bd | 893 | } |
7591bab1 | 894 | health_code_update(); |
d227d5bd | 895 | |
7591bab1 MD |
896 | ret = 0; |
897 | end_free: | |
898 | free(send_session_buf); | |
899 | return ret; | |
d227d5bd JD |
900 | } |
901 | ||
80e8027a | 902 | /* |
7591bab1 | 903 | * Send the viewer the list of current streams. |
80e8027a JD |
904 | */ |
905 | static | |
58eb9381 | 906 | int viewer_get_new_streams(struct relay_connection *conn) |
80e8027a JD |
907 | { |
908 | int ret, send_streams = 0; | |
7591bab1 | 909 | uint32_t nb_created = 0, nb_unsent = 0, nb_streams = 0, nb_total = 0; |
80e8027a JD |
910 | struct lttng_viewer_new_streams_request request; |
911 | struct lttng_viewer_new_streams_response response; | |
80e8027a | 912 | struct relay_session *session; |
6763619c | 913 | uint64_t session_id; |
bddf80e4 | 914 | bool closed = false; |
80e8027a | 915 | |
58eb9381 | 916 | assert(conn); |
80e8027a JD |
917 | |
918 | DBG("Get new streams received"); | |
919 | ||
80e8027a JD |
920 | health_code_update(); |
921 | ||
2f8f53af | 922 | /* Receive the request from the connected client. */ |
58eb9381 | 923 | ret = recv_request(conn->sock, &request, sizeof(request)); |
2f8f53af | 924 | if (ret < 0) { |
80e8027a JD |
925 | goto error; |
926 | } | |
6763619c | 927 | session_id = be64toh(request.session_id); |
80e8027a JD |
928 | |
929 | health_code_update(); | |
930 | ||
53efb85a MD |
931 | memset(&response, 0, sizeof(response)); |
932 | ||
7591bab1 | 933 | session = session_get_by_id(session_id); |
2f8f53af | 934 | if (!session) { |
6763619c | 935 | DBG("Relay session %" PRIu64 " not found", session_id); |
c4e361a4 | 936 | response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_ERR); |
80e8027a JD |
937 | goto send_reply; |
938 | } | |
939 | ||
7591bab1 | 940 | if (!viewer_session_is_attached(conn->viewer_session, session)) { |
80e8027a | 941 | send_streams = 0; |
c4e361a4 | 942 | response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_ERR); |
80e8027a JD |
943 | goto send_reply; |
944 | } | |
945 | ||
6763619c JD |
946 | send_streams = 1; |
947 | response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_OK); | |
948 | ||
7591bab1 | 949 | ret = make_viewer_streams(session, LTTNG_VIEWER_SEEK_LAST, &nb_total, &nb_unsent, |
bddf80e4 | 950 | &nb_created, &closed); |
2f8f53af | 951 | if (ret < 0) { |
7591bab1 | 952 | goto end_put_session; |
2f8f53af DG |
953 | } |
954 | /* Only send back the newly created streams with the unsent ones. */ | |
955 | nb_streams = nb_created + nb_unsent; | |
80e8027a JD |
956 | response.streams_count = htobe32(nb_streams); |
957 | ||
4479f682 | 958 | /* |
2229a09c MD |
959 | * If the session is closed, HUP when there are no more streams |
960 | * with data. | |
4479f682 | 961 | */ |
bddf80e4 | 962 | if (closed && nb_total == 0) { |
4479f682 | 963 | send_streams = 0; |
bddf80e4 | 964 | response.streams_count = 0; |
4479f682 JD |
965 | response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_HUP); |
966 | goto send_reply; | |
967 | } | |
968 | ||
80e8027a JD |
969 | send_reply: |
970 | health_code_update(); | |
58eb9381 | 971 | ret = send_response(conn->sock, &response, sizeof(response)); |
80e8027a | 972 | if (ret < 0) { |
7591bab1 | 973 | goto end_put_session; |
80e8027a JD |
974 | } |
975 | health_code_update(); | |
976 | ||
977 | /* | |
7591bab1 MD |
978 | * Unknown or empty session, just return gracefully, the viewer |
979 | * knows what is happening. | |
80e8027a JD |
980 | */ |
981 | if (!send_streams || !nb_streams) { | |
982 | ret = 0; | |
7591bab1 | 983 | goto end_put_session; |
80e8027a JD |
984 | } |
985 | ||
2f8f53af | 986 | /* |
7591bab1 MD |
987 | * Send stream and *DON'T* ignore the sent flag so every viewer |
988 | * streams that were not sent from that point will be sent to | |
989 | * the viewer. | |
2f8f53af | 990 | */ |
58eb9381 | 991 | ret = send_viewer_streams(conn->sock, session, 0); |
2f8f53af | 992 | if (ret < 0) { |
7591bab1 | 993 | goto end_put_session; |
80e8027a JD |
994 | } |
995 | ||
7591bab1 MD |
996 | end_put_session: |
997 | if (session) { | |
998 | session_put(session); | |
999 | } | |
80e8027a JD |
1000 | error: |
1001 | return ret; | |
1002 | } | |
1003 | ||
d3e2ba59 JD |
1004 | /* |
1005 | * Send the viewer the list of current sessions. | |
1006 | */ | |
1007 | static | |
58eb9381 | 1008 | int viewer_attach_session(struct relay_connection *conn) |
d3e2ba59 | 1009 | { |
2f8f53af DG |
1010 | int send_streams = 0; |
1011 | ssize_t ret; | |
80e8027a | 1012 | uint32_t nb_streams = 0; |
2f8f53af | 1013 | enum lttng_viewer_seek seek_type; |
d3e2ba59 JD |
1014 | struct lttng_viewer_attach_session_request request; |
1015 | struct lttng_viewer_attach_session_response response; | |
7591bab1 | 1016 | struct relay_session *session = NULL; |
bddf80e4 | 1017 | bool closed = false; |
d3e2ba59 | 1018 | |
58eb9381 | 1019 | assert(conn); |
d3e2ba59 | 1020 | |
eea7556c MD |
1021 | health_code_update(); |
1022 | ||
2f8f53af | 1023 | /* Receive the request from the connected client. */ |
58eb9381 | 1024 | ret = recv_request(conn->sock, &request, sizeof(request)); |
2f8f53af | 1025 | if (ret < 0) { |
d3e2ba59 JD |
1026 | goto error; |
1027 | } | |
1028 | ||
eea7556c MD |
1029 | health_code_update(); |
1030 | ||
53efb85a MD |
1031 | memset(&response, 0, sizeof(response)); |
1032 | ||
c3b7390b JD |
1033 | if (!conn->viewer_session) { |
1034 | DBG("Client trying to attach before creating a live viewer session"); | |
1035 | response.status = htobe32(LTTNG_VIEWER_ATTACH_NO_SESSION); | |
1036 | goto send_reply; | |
1037 | } | |
1038 | ||
7591bab1 | 1039 | session = session_get_by_id(be64toh(request.session_id)); |
2f8f53af | 1040 | if (!session) { |
d3e2ba59 JD |
1041 | DBG("Relay session %" PRIu64 " not found", |
1042 | be64toh(request.session_id)); | |
c4e361a4 | 1043 | response.status = htobe32(LTTNG_VIEWER_ATTACH_UNK); |
d3e2ba59 JD |
1044 | goto send_reply; |
1045 | } | |
7591bab1 MD |
1046 | DBG("Attach session ID %" PRIu64 " received", |
1047 | be64toh(request.session_id)); | |
d3e2ba59 | 1048 | |
7591bab1 | 1049 | if (session->live_timer == 0) { |
d3e2ba59 | 1050 | DBG("Not live session"); |
c4e361a4 | 1051 | response.status = htobe32(LTTNG_VIEWER_ATTACH_NOT_LIVE); |
d3e2ba59 | 1052 | goto send_reply; |
7591bab1 MD |
1053 | } |
1054 | ||
1055 | send_streams = 1; | |
1056 | ret = viewer_session_attach(conn->viewer_session, session); | |
1057 | if (ret) { | |
1058 | DBG("Already a viewer attached"); | |
1059 | response.status = htobe32(LTTNG_VIEWER_ATTACH_ALREADY); | |
1060 | goto send_reply; | |
d3e2ba59 JD |
1061 | } |
1062 | ||
1063 | switch (be32toh(request.seek)) { | |
c4e361a4 JD |
1064 | case LTTNG_VIEWER_SEEK_BEGINNING: |
1065 | case LTTNG_VIEWER_SEEK_LAST: | |
7591bab1 | 1066 | response.status = htobe32(LTTNG_VIEWER_ATTACH_OK); |
2f8f53af | 1067 | seek_type = be32toh(request.seek); |
d3e2ba59 JD |
1068 | break; |
1069 | default: | |
1070 | ERR("Wrong seek parameter"); | |
c4e361a4 | 1071 | response.status = htobe32(LTTNG_VIEWER_ATTACH_SEEK_ERR); |
d3e2ba59 JD |
1072 | send_streams = 0; |
1073 | goto send_reply; | |
1074 | } | |
1075 | ||
bddf80e4 MD |
1076 | ret = make_viewer_streams(session, seek_type, &nb_streams, NULL, |
1077 | NULL, &closed); | |
2f8f53af | 1078 | if (ret < 0) { |
7591bab1 | 1079 | goto end_put_session; |
d3e2ba59 | 1080 | } |
2f8f53af | 1081 | response.streams_count = htobe32(nb_streams); |
d3e2ba59 | 1082 | |
bddf80e4 MD |
1083 | /* |
1084 | * If the session is closed when the viewer is attaching, it | |
1085 | * means some of the streams may have been concurrently removed, | |
1086 | * so we don't allow the viewer to attach, even if there are | |
1087 | * streams available. | |
1088 | */ | |
1089 | if (closed) { | |
1090 | send_streams = 0; | |
1091 | response.streams_count = 0; | |
1092 | response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_HUP); | |
1093 | goto send_reply; | |
1094 | } | |
1095 | ||
d3e2ba59 | 1096 | send_reply: |
eea7556c | 1097 | health_code_update(); |
58eb9381 | 1098 | ret = send_response(conn->sock, &response, sizeof(response)); |
d3e2ba59 | 1099 | if (ret < 0) { |
7591bab1 | 1100 | goto end_put_session; |
d3e2ba59 | 1101 | } |
eea7556c | 1102 | health_code_update(); |
d3e2ba59 JD |
1103 | |
1104 | /* | |
7591bab1 MD |
1105 | * Unknown or empty session, just return gracefully, the viewer |
1106 | * knows what is happening. | |
d3e2ba59 | 1107 | */ |
157df586 | 1108 | if (!send_streams || !nb_streams) { |
d3e2ba59 | 1109 | ret = 0; |
7591bab1 | 1110 | goto end_put_session; |
d3e2ba59 JD |
1111 | } |
1112 | ||
2f8f53af | 1113 | /* Send stream and ignore the sent flag. */ |
58eb9381 | 1114 | ret = send_viewer_streams(conn->sock, session, 1); |
2f8f53af | 1115 | if (ret < 0) { |
7591bab1 | 1116 | goto end_put_session; |
d3e2ba59 | 1117 | } |
d3e2ba59 | 1118 | |
7591bab1 MD |
1119 | end_put_session: |
1120 | if (session) { | |
1121 | session_put(session); | |
1122 | } | |
4a9daf17 JD |
1123 | error: |
1124 | return ret; | |
1125 | } | |
1126 | ||
878c34cf DG |
1127 | /* |
1128 | * Open the index file if needed for the given vstream. | |
1129 | * | |
e0547b83 MD |
1130 | * If an index file is successfully opened, the vstream will set it as its |
1131 | * current index file. | |
878c34cf DG |
1132 | * |
1133 | * Return 0 on success, a negative value on error (-ENOENT if not ready yet). | |
7591bab1 MD |
1134 | * |
1135 | * Called with rstream lock held. | |
878c34cf DG |
1136 | */ |
1137 | static int try_open_index(struct relay_viewer_stream *vstream, | |
1138 | struct relay_stream *rstream) | |
1139 | { | |
1140 | int ret = 0; | |
1141 | ||
e0547b83 | 1142 | if (vstream->index_file) { |
878c34cf DG |
1143 | goto end; |
1144 | } | |
1145 | ||
1146 | /* | |
7591bab1 | 1147 | * First time, we open the index file and at least one index is ready. |
878c34cf | 1148 | */ |
a44ca2ca | 1149 | if (rstream->index_received_seqcount == 0) { |
878c34cf DG |
1150 | ret = -ENOENT; |
1151 | goto end; | |
1152 | } | |
e0547b83 MD |
1153 | vstream->index_file = lttng_index_file_open(vstream->path_name, |
1154 | vstream->channel_name, | |
7591bab1 MD |
1155 | vstream->stream->tracefile_count, |
1156 | vstream->current_tracefile_id); | |
e0547b83 MD |
1157 | if (!vstream->index_file) { |
1158 | ret = -1; | |
878c34cf DG |
1159 | } |
1160 | ||
1161 | end: | |
1162 | return ret; | |
1163 | } | |
1164 | ||
1165 | /* | |
7591bab1 MD |
1166 | * Check the status of the index for the given stream. This function |
1167 | * updates the index structure if needed and can put (close) the vstream | |
1168 | * in the HUP situation. | |
1169 | * | |
1170 | * Return 0 means that we can proceed with the index. A value of 1 means | |
1171 | * that the index has been updated and is ready to be sent to the | |
1172 | * client. A negative value indicates an error that can't be handled. | |
878c34cf | 1173 | * |
7591bab1 | 1174 | * Called with rstream lock held. |
878c34cf DG |
1175 | */ |
1176 | static int check_index_status(struct relay_viewer_stream *vstream, | |
1177 | struct relay_stream *rstream, struct ctf_trace *trace, | |
1178 | struct lttng_viewer_index *index) | |
1179 | { | |
1180 | int ret; | |
1181 | ||
7591bab1 | 1182 | if (trace->session->connection_closed |
a44ca2ca MD |
1183 | && rstream->index_received_seqcount |
1184 | == vstream->index_sent_seqcount) { | |
7591bab1 MD |
1185 | /* Last index sent and session connection is closed. */ |
1186 | index->status = htobe32(LTTNG_VIEWER_INDEX_HUP); | |
1187 | goto hup; | |
1188 | } else if (rstream->beacon_ts_end != -1ULL && | |
a44ca2ca MD |
1189 | rstream->index_received_seqcount |
1190 | == vstream->index_sent_seqcount) { | |
7591bab1 MD |
1191 | /* |
1192 | * We've received a synchronization beacon and the last index | |
1193 | * available has been sent, the index for now is inactive. | |
1194 | * | |
1195 | * In this case, we have received a beacon which allows us to | |
1196 | * inform the client of a time interval during which we can | |
1197 | * guarantee that there are no events to read (and never will | |
1198 | * be). | |
1199 | */ | |
1200 | index->status = htobe32(LTTNG_VIEWER_INDEX_INACTIVE); | |
1201 | index->timestamp_end = htobe64(rstream->beacon_ts_end); | |
1202 | index->stream_id = htobe64(rstream->ctf_stream_id); | |
1203 | goto index_ready; | |
a44ca2ca MD |
1204 | } else if (rstream->index_received_seqcount |
1205 | == vstream->index_sent_seqcount) { | |
7591bab1 | 1206 | /* |
a44ca2ca MD |
1207 | * This checks whether received == sent seqcount. In |
1208 | * this case, we have not received a beacon. Therefore, | |
1209 | * we can only ask the client to retry later. | |
7591bab1 MD |
1210 | */ |
1211 | index->status = htobe32(LTTNG_VIEWER_INDEX_RETRY); | |
1212 | goto index_ready; | |
a44ca2ca MD |
1213 | } else if (!tracefile_array_seq_in_file(rstream->tfa, |
1214 | vstream->current_tracefile_id, | |
1215 | vstream->index_sent_seqcount)) { | |
7591bab1 | 1216 | /* |
a44ca2ca MD |
1217 | * The next index we want to send cannot be read either |
1218 | * because we need to perform a rotation, or due to | |
1219 | * the producer having overwritten its trace file. | |
7591bab1 | 1220 | */ |
a44ca2ca | 1221 | DBG("Viewer stream %" PRIu64 " rotation", |
7591bab1 MD |
1222 | vstream->stream->stream_handle); |
1223 | ret = viewer_stream_rotate(vstream); | |
1224 | if (ret < 0) { | |
1225 | goto end; | |
1226 | } else if (ret == 1) { | |
1227 | /* EOF across entire stream. */ | |
1228 | index->status = htobe32(LTTNG_VIEWER_INDEX_HUP); | |
1229 | goto hup; | |
1230 | } | |
7591bab1 | 1231 | /* |
a44ca2ca MD |
1232 | * If we have been pushed due to overwrite, it |
1233 | * necessarily means there is data that can be read in | |
1234 | * the stream. If we rotated because we reached the end | |
1235 | * of a tracefile, it means the following tracefile | |
1236 | * needs to contain at least one index, else we would | |
1237 | * have already returned LTTNG_VIEWER_INDEX_RETRY to the | |
1238 | * viewer. The updated index_sent_seqcount needs to | |
1239 | * point to a readable index entry now. | |
1240 | * | |
1241 | * In the case where we "rotate" on a single file, we | |
1242 | * can end up in a case where the requested index is | |
1243 | * still unavailable. | |
7591bab1 | 1244 | */ |
a44ca2ca MD |
1245 | if (rstream->tracefile_count == 1 && |
1246 | !tracefile_array_seq_in_file( | |
1247 | rstream->tfa, | |
1248 | vstream->current_tracefile_id, | |
1249 | vstream->index_sent_seqcount)) { | |
1250 | index->status = htobe32(LTTNG_VIEWER_INDEX_RETRY); | |
1251 | goto index_ready; | |
878c34cf | 1252 | } |
a44ca2ca MD |
1253 | assert(tracefile_array_seq_in_file(rstream->tfa, |
1254 | vstream->current_tracefile_id, | |
1255 | vstream->index_sent_seqcount)); | |
878c34cf | 1256 | } |
a44ca2ca MD |
1257 | /* ret == 0 means successful so we continue. */ |
1258 | ret = 0; | |
7591bab1 | 1259 | end: |
878c34cf DG |
1260 | return ret; |
1261 | ||
1262 | hup: | |
7591bab1 | 1263 | viewer_stream_put(vstream); |
878c34cf DG |
1264 | index_ready: |
1265 | return 1; | |
1266 | } | |
1267 | ||
d3e2ba59 JD |
1268 | /* |
1269 | * Send the next index for a stream. | |
1270 | * | |
1271 | * Return 0 on success or else a negative value. | |
1272 | */ | |
1273 | static | |
58eb9381 | 1274 | int viewer_get_next_index(struct relay_connection *conn) |
d3e2ba59 JD |
1275 | { |
1276 | int ret; | |
1277 | struct lttng_viewer_get_next_index request_index; | |
1278 | struct lttng_viewer_index viewer_index; | |
50adc264 | 1279 | struct ctf_packet_index packet_index; |
7591bab1 MD |
1280 | struct relay_viewer_stream *vstream = NULL; |
1281 | struct relay_stream *rstream = NULL; | |
1282 | struct ctf_trace *ctf_trace = NULL; | |
1283 | struct relay_viewer_stream *metadata_viewer_stream = NULL; | |
d3e2ba59 | 1284 | |
58eb9381 | 1285 | assert(conn); |
d3e2ba59 JD |
1286 | |
1287 | DBG("Viewer get next index"); | |
1288 | ||
7591bab1 | 1289 | memset(&viewer_index, 0, sizeof(viewer_index)); |
eea7556c | 1290 | health_code_update(); |
2f8f53af | 1291 | |
58eb9381 | 1292 | ret = recv_request(conn->sock, &request_index, sizeof(request_index)); |
2f8f53af | 1293 | if (ret < 0) { |
d3e2ba59 JD |
1294 | goto end; |
1295 | } | |
eea7556c | 1296 | health_code_update(); |
d3e2ba59 | 1297 | |
7591bab1 | 1298 | vstream = viewer_stream_get_by_id(be64toh(request_index.stream_id)); |
6763619c | 1299 | if (!vstream) { |
a44ca2ca MD |
1300 | DBG("Client requested index of unknown stream id %" PRIu64, |
1301 | be64toh(request_index.stream_id)); | |
f1883937 MD |
1302 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR); |
1303 | goto send_reply; | |
2a174661 DG |
1304 | } |
1305 | ||
7591bab1 MD |
1306 | /* Use back. ref. Protected by refcounts. */ |
1307 | rstream = vstream->stream; | |
1308 | ctf_trace = rstream->trace; | |
d3e2ba59 | 1309 | |
7591bab1 MD |
1310 | /* metadata_viewer_stream may be NULL. */ |
1311 | metadata_viewer_stream = | |
1312 | ctf_trace_get_viewer_metadata_stream(ctf_trace); | |
2a174661 | 1313 | |
7591bab1 | 1314 | pthread_mutex_lock(&rstream->lock); |
d3e2ba59 JD |
1315 | |
1316 | /* | |
1317 | * The viewer should not ask for index on metadata stream. | |
1318 | */ | |
7591bab1 | 1319 | if (rstream->is_metadata) { |
c4e361a4 | 1320 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_HUP); |
d3e2ba59 JD |
1321 | goto send_reply; |
1322 | } | |
1323 | ||
878c34cf DG |
1324 | /* Try to open an index if one is needed for that stream. */ |
1325 | ret = try_open_index(vstream, rstream); | |
1326 | if (ret < 0) { | |
0e6830aa | 1327 | if (ret == -ENOENT) { |
d3e2ba59 | 1328 | /* |
7591bab1 MD |
1329 | * The index is created only when the first data |
1330 | * packet arrives, it might not be ready at the | |
1331 | * beginning of the session | |
d3e2ba59 | 1332 | */ |
c4e361a4 | 1333 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_RETRY); |
878c34cf DG |
1334 | } else { |
1335 | /* Unhandled error. */ | |
c4e361a4 | 1336 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR); |
d3e2ba59 | 1337 | } |
878c34cf | 1338 | goto send_reply; |
d3e2ba59 JD |
1339 | } |
1340 | ||
878c34cf | 1341 | ret = check_index_status(vstream, rstream, ctf_trace, &viewer_index); |
878c34cf | 1342 | if (ret < 0) { |
7591bab1 | 1343 | goto error_put; |
878c34cf DG |
1344 | } else if (ret == 1) { |
1345 | /* | |
7591bab1 MD |
1346 | * We have no index to send and check_index_status has populated |
1347 | * viewer_index's status. | |
878c34cf | 1348 | */ |
d3e2ba59 JD |
1349 | goto send_reply; |
1350 | } | |
7591bab1 | 1351 | /* At this point, ret is 0 thus we will be able to read the index. */ |
878c34cf | 1352 | assert(!ret); |
d3e2ba59 | 1353 | |
7591bab1 MD |
1354 | /* |
1355 | * vstream->stream_fd may be NULL if it has been closed by | |
1356 | * tracefile rotation, or if we are at the beginning of the | |
1357 | * stream. We open the data stream file here to protect against | |
1358 | * overwrite caused by tracefile rotation (in association with | |
1359 | * unlink performed before overwrite). | |
1360 | */ | |
1361 | if (!vstream->stream_fd) { | |
1362 | char fullpath[PATH_MAX]; | |
1363 | ||
1364 | if (vstream->stream->tracefile_count > 0) { | |
1365 | ret = snprintf(fullpath, PATH_MAX, "%s/%s_%" PRIu64, | |
1366 | vstream->path_name, | |
1367 | vstream->channel_name, | |
1368 | vstream->current_tracefile_id); | |
1369 | } else { | |
1370 | ret = snprintf(fullpath, PATH_MAX, "%s/%s", | |
1371 | vstream->path_name, | |
1372 | vstream->channel_name); | |
1373 | } | |
1374 | if (ret < 0) { | |
1375 | goto error_put; | |
1376 | } | |
1377 | ret = open(fullpath, O_RDONLY); | |
1378 | if (ret < 0) { | |
1379 | PERROR("Relay opening trace file"); | |
1380 | goto error_put; | |
1381 | } | |
1382 | vstream->stream_fd = stream_fd_create(ret); | |
1383 | if (!vstream->stream_fd) { | |
1384 | if (close(ret)) { | |
1385 | PERROR("close"); | |
1386 | } | |
1387 | goto error_put; | |
1388 | } | |
d3e2ba59 JD |
1389 | } |
1390 | ||
f04a971b | 1391 | ret = check_new_streams(conn); |
4a9daf17 | 1392 | if (ret < 0) { |
7591bab1 MD |
1393 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR); |
1394 | goto send_reply; | |
4a9daf17 JD |
1395 | } else if (ret == 1) { |
1396 | viewer_index.flags |= LTTNG_VIEWER_FLAG_NEW_STREAM; | |
1397 | } | |
1398 | ||
e0547b83 MD |
1399 | ret = lttng_index_file_read(vstream->index_file, &packet_index); |
1400 | if (ret) { | |
1401 | ERR("Relay error reading index file %d", | |
1402 | vstream->index_file->fd); | |
7591bab1 | 1403 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR); |
6b6b9a5a | 1404 | goto send_reply; |
d3e2ba59 | 1405 | } else { |
c4e361a4 | 1406 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_OK); |
a44ca2ca | 1407 | vstream->index_sent_seqcount++; |
d3e2ba59 JD |
1408 | } |
1409 | ||
1410 | /* | |
1411 | * Indexes are stored in big endian, no need to switch before sending. | |
1412 | */ | |
7591bab1 MD |
1413 | DBG("Sending viewer index for stream %" PRIu64 " offset %" PRIu64, |
1414 | rstream->stream_handle, | |
1415 | be64toh(packet_index.offset)); | |
d3e2ba59 JD |
1416 | viewer_index.offset = packet_index.offset; |
1417 | viewer_index.packet_size = packet_index.packet_size; | |
1418 | viewer_index.content_size = packet_index.content_size; | |
1419 | viewer_index.timestamp_begin = packet_index.timestamp_begin; | |
1420 | viewer_index.timestamp_end = packet_index.timestamp_end; | |
1421 | viewer_index.events_discarded = packet_index.events_discarded; | |
1422 | viewer_index.stream_id = packet_index.stream_id; | |
1423 | ||
1424 | send_reply: | |
f1883937 MD |
1425 | if (rstream) { |
1426 | pthread_mutex_unlock(&rstream->lock); | |
1427 | } | |
7591bab1 MD |
1428 | |
1429 | if (metadata_viewer_stream) { | |
1430 | pthread_mutex_lock(&metadata_viewer_stream->stream->lock); | |
1431 | DBG("get next index metadata check: recv %" PRIu64 | |
1432 | " sent %" PRIu64, | |
1433 | metadata_viewer_stream->stream->metadata_received, | |
1434 | metadata_viewer_stream->metadata_sent); | |
1435 | if (!metadata_viewer_stream->stream->metadata_received || | |
1436 | metadata_viewer_stream->stream->metadata_received > | |
1437 | metadata_viewer_stream->metadata_sent) { | |
1438 | viewer_index.flags |= LTTNG_VIEWER_FLAG_NEW_METADATA; | |
1439 | } | |
1440 | pthread_mutex_unlock(&metadata_viewer_stream->stream->lock); | |
1441 | } | |
1442 | ||
d3e2ba59 | 1443 | viewer_index.flags = htobe32(viewer_index.flags); |
eea7556c | 1444 | health_code_update(); |
2f8f53af | 1445 | |
58eb9381 | 1446 | ret = send_response(conn->sock, &viewer_index, sizeof(viewer_index)); |
d3e2ba59 | 1447 | if (ret < 0) { |
7591bab1 | 1448 | goto end; |
d3e2ba59 | 1449 | } |
eea7556c | 1450 | health_code_update(); |
d3e2ba59 | 1451 | |
9237e6a1 MD |
1452 | if (vstream) { |
1453 | DBG("Index %" PRIu64 " for stream %" PRIu64 " sent", | |
a44ca2ca | 1454 | vstream->index_sent_seqcount, |
9237e6a1 MD |
1455 | vstream->stream->stream_handle); |
1456 | } | |
d3e2ba59 | 1457 | end: |
7591bab1 MD |
1458 | if (metadata_viewer_stream) { |
1459 | viewer_stream_put(metadata_viewer_stream); | |
1460 | } | |
1461 | if (vstream) { | |
1462 | viewer_stream_put(vstream); | |
1463 | } | |
1464 | return ret; | |
1465 | ||
1466 | error_put: | |
1467 | pthread_mutex_unlock(&rstream->lock); | |
1468 | if (metadata_viewer_stream) { | |
1469 | viewer_stream_put(metadata_viewer_stream); | |
1470 | } | |
1471 | viewer_stream_put(vstream); | |
d3e2ba59 JD |
1472 | return ret; |
1473 | } | |
1474 | ||
1475 | /* | |
1476 | * Send the next index for a stream | |
1477 | * | |
1478 | * Return 0 on success or else a negative value. | |
1479 | */ | |
1480 | static | |
58eb9381 | 1481 | int viewer_get_packet(struct relay_connection *conn) |
d3e2ba59 | 1482 | { |
4e8db96d | 1483 | int ret; |
b61e1dca | 1484 | off_t lseek_ret; |
6d1bce6b | 1485 | char *reply = NULL; |
d3e2ba59 | 1486 | struct lttng_viewer_get_packet get_packet_info; |
6d1bce6b | 1487 | struct lttng_viewer_trace_packet reply_header; |
7591bab1 | 1488 | struct relay_viewer_stream *vstream = NULL; |
6d1bce6b | 1489 | uint32_t reply_size = sizeof(reply_header); |
4e8db96d JR |
1490 | uint32_t packet_data_len = 0; |
1491 | ssize_t read_len; | |
d3e2ba59 JD |
1492 | |
1493 | DBG2("Relay get data packet"); | |
1494 | ||
eea7556c | 1495 | health_code_update(); |
2f8f53af | 1496 | |
7591bab1 MD |
1497 | ret = recv_request(conn->sock, &get_packet_info, |
1498 | sizeof(get_packet_info)); | |
2f8f53af | 1499 | if (ret < 0) { |
d3e2ba59 JD |
1500 | goto end; |
1501 | } | |
eea7556c | 1502 | health_code_update(); |
d3e2ba59 | 1503 | |
0233a6a5 | 1504 | /* From this point on, the error label can be reached. */ |
6d1bce6b | 1505 | memset(&reply_header, 0, sizeof(reply_header)); |
0233a6a5 | 1506 | |
7591bab1 MD |
1507 | vstream = viewer_stream_get_by_id(be64toh(get_packet_info.stream_id)); |
1508 | if (!vstream) { | |
a44ca2ca MD |
1509 | DBG("Client requested packet of unknown stream id %" PRIu64, |
1510 | be64toh(get_packet_info.stream_id)); | |
6d1bce6b JG |
1511 | reply_header.status = htobe32(LTTNG_VIEWER_GET_PACKET_ERR); |
1512 | goto send_reply_nolock; | |
4e8db96d JR |
1513 | } else { |
1514 | packet_data_len = be32toh(get_packet_info.len); | |
6d1bce6b | 1515 | reply_size += packet_data_len; |
d3e2ba59 | 1516 | } |
2a174661 | 1517 | |
6d1bce6b JG |
1518 | reply = zmalloc(reply_size); |
1519 | if (!reply) { | |
1520 | PERROR("packet reply zmalloc"); | |
1521 | reply_size = sizeof(reply_header); | |
d3e2ba59 JD |
1522 | goto error; |
1523 | } | |
1524 | ||
4e8db96d | 1525 | pthread_mutex_lock(&vstream->stream->lock); |
b61e1dca | 1526 | lseek_ret = lseek(vstream->stream_fd->fd, be64toh(get_packet_info.offset), |
7591bab1 | 1527 | SEEK_SET); |
b61e1dca | 1528 | if (lseek_ret < 0) { |
7591bab1 MD |
1529 | PERROR("lseek fd %d to offset %" PRIu64, vstream->stream_fd->fd, |
1530 | be64toh(get_packet_info.offset)); | |
1531 | goto error; | |
d3e2ba59 | 1532 | } |
4e8db96d | 1533 | read_len = lttng_read(vstream->stream_fd->fd, |
6d1bce6b | 1534 | reply + sizeof(reply_header), |
4e8db96d JR |
1535 | packet_data_len); |
1536 | if (read_len < packet_data_len) { | |
7591bab1 MD |
1537 | PERROR("Relay reading trace file, fd: %d, offset: %" PRIu64, |
1538 | vstream->stream_fd->fd, | |
1539 | be64toh(get_packet_info.offset)); | |
1540 | goto error; | |
d3e2ba59 | 1541 | } |
6d1bce6b JG |
1542 | reply_header.status = htobe32(LTTNG_VIEWER_GET_PACKET_OK); |
1543 | reply_header.len = htobe32(packet_data_len); | |
d3e2ba59 JD |
1544 | goto send_reply; |
1545 | ||
1546 | error: | |
6d1bce6b | 1547 | reply_header.status = htobe32(LTTNG_VIEWER_GET_PACKET_ERR); |
d3e2ba59 JD |
1548 | |
1549 | send_reply: | |
7591bab1 MD |
1550 | if (vstream) { |
1551 | pthread_mutex_unlock(&vstream->stream->lock); | |
1552 | } | |
1553 | send_reply_nolock: | |
eea7556c MD |
1554 | |
1555 | health_code_update(); | |
2f8f53af | 1556 | |
6d1bce6b JG |
1557 | if (reply) { |
1558 | memcpy(reply, &reply_header, sizeof(reply_header)); | |
1559 | ret = send_response(conn->sock, reply, reply_size); | |
1560 | } else { | |
1561 | /* No reply to send. */ | |
1562 | ret = send_response(conn->sock, &reply_header, | |
1563 | reply_size); | |
1564 | } | |
1565 | ||
4e8db96d | 1566 | health_code_update(); |
d3e2ba59 | 1567 | if (ret < 0) { |
4e8db96d | 1568 | PERROR("sendmsg of packet data failed"); |
7591bab1 | 1569 | goto end_free; |
d3e2ba59 | 1570 | } |
d3e2ba59 | 1571 | |
6d1bce6b | 1572 | DBG("Sent %u bytes for stream %" PRIu64, reply_size, |
d3e2ba59 JD |
1573 | be64toh(get_packet_info.stream_id)); |
1574 | ||
7591bab1 | 1575 | end_free: |
6d1bce6b | 1576 | free(reply); |
d3e2ba59 | 1577 | end: |
7591bab1 MD |
1578 | if (vstream) { |
1579 | viewer_stream_put(vstream); | |
1580 | } | |
d3e2ba59 JD |
1581 | return ret; |
1582 | } | |
1583 | ||
1584 | /* | |
1585 | * Send the session's metadata | |
1586 | * | |
1587 | * Return 0 on success else a negative value. | |
1588 | */ | |
1589 | static | |
58eb9381 | 1590 | int viewer_get_metadata(struct relay_connection *conn) |
d3e2ba59 JD |
1591 | { |
1592 | int ret = 0; | |
1593 | ssize_t read_len; | |
1594 | uint64_t len = 0; | |
1595 | char *data = NULL; | |
1596 | struct lttng_viewer_get_metadata request; | |
1597 | struct lttng_viewer_metadata_packet reply; | |
7591bab1 | 1598 | struct relay_viewer_stream *vstream = NULL; |
d3e2ba59 | 1599 | |
58eb9381 | 1600 | assert(conn); |
d3e2ba59 JD |
1601 | |
1602 | DBG("Relay get metadata"); | |
1603 | ||
eea7556c | 1604 | health_code_update(); |
2f8f53af | 1605 | |
58eb9381 | 1606 | ret = recv_request(conn->sock, &request, sizeof(request)); |
2f8f53af | 1607 | if (ret < 0) { |
d3e2ba59 JD |
1608 | goto end; |
1609 | } | |
eea7556c | 1610 | health_code_update(); |
d3e2ba59 | 1611 | |
53efb85a MD |
1612 | memset(&reply, 0, sizeof(reply)); |
1613 | ||
7591bab1 MD |
1614 | vstream = viewer_stream_get_by_id(be64toh(request.stream_id)); |
1615 | if (!vstream) { | |
3b463131 MD |
1616 | /* |
1617 | * The metadata stream can be closed by a CLOSE command | |
1618 | * just before we attach. It can also be closed by | |
1619 | * per-pid tracing during tracing. Therefore, it is | |
1620 | * possible that we cannot find this viewer stream. | |
1621 | * Reply back to the client with an error if we cannot | |
1622 | * find it. | |
1623 | */ | |
a44ca2ca MD |
1624 | DBG("Client requested metadata of unknown stream id %" PRIu64, |
1625 | be64toh(request.stream_id)); | |
3b463131 | 1626 | reply.status = htobe32(LTTNG_VIEWER_METADATA_ERR); |
7591bab1 | 1627 | goto send_reply; |
d3e2ba59 | 1628 | } |
7591bab1 MD |
1629 | pthread_mutex_lock(&vstream->stream->lock); |
1630 | if (!vstream->stream->is_metadata) { | |
1631 | ERR("Invalid metadata stream"); | |
6763619c JD |
1632 | goto error; |
1633 | } | |
1634 | ||
7591bab1 | 1635 | assert(vstream->metadata_sent <= vstream->stream->metadata_received); |
2a174661 | 1636 | |
7591bab1 | 1637 | len = vstream->stream->metadata_received - vstream->metadata_sent; |
d3e2ba59 | 1638 | if (len == 0) { |
c4e361a4 | 1639 | reply.status = htobe32(LTTNG_VIEWER_NO_NEW_METADATA); |
d3e2ba59 JD |
1640 | goto send_reply; |
1641 | } | |
1642 | ||
1643 | /* first time, we open the metadata file */ | |
7591bab1 | 1644 | if (!vstream->stream_fd) { |
d3e2ba59 JD |
1645 | char fullpath[PATH_MAX]; |
1646 | ||
7591bab1 MD |
1647 | ret = snprintf(fullpath, PATH_MAX, "%s/%s", vstream->path_name, |
1648 | vstream->channel_name); | |
d3e2ba59 JD |
1649 | if (ret < 0) { |
1650 | goto error; | |
1651 | } | |
1652 | ret = open(fullpath, O_RDONLY); | |
1653 | if (ret < 0) { | |
1654 | PERROR("Relay opening metadata file"); | |
1655 | goto error; | |
1656 | } | |
7591bab1 MD |
1657 | vstream->stream_fd = stream_fd_create(ret); |
1658 | if (!vstream->stream_fd) { | |
1659 | if (close(ret)) { | |
1660 | PERROR("close"); | |
1661 | } | |
1662 | goto error; | |
1663 | } | |
d3e2ba59 JD |
1664 | } |
1665 | ||
1666 | reply.len = htobe64(len); | |
1667 | data = zmalloc(len); | |
1668 | if (!data) { | |
1669 | PERROR("viewer metadata zmalloc"); | |
1670 | goto error; | |
1671 | } | |
1672 | ||
7591bab1 | 1673 | read_len = lttng_read(vstream->stream_fd->fd, data, len); |
6cd525e8 | 1674 | if (read_len < len) { |
d3e2ba59 JD |
1675 | PERROR("Relay reading metadata file"); |
1676 | goto error; | |
1677 | } | |
7591bab1 MD |
1678 | vstream->metadata_sent += read_len; |
1679 | if (vstream->metadata_sent == vstream->stream->metadata_received | |
1680 | && vstream->stream->closed) { | |
1681 | /* Release ownership for the viewer metadata stream. */ | |
1682 | viewer_stream_put(vstream); | |
1683 | } | |
1684 | ||
c4e361a4 | 1685 | reply.status = htobe32(LTTNG_VIEWER_METADATA_OK); |
7591bab1 | 1686 | |
d3e2ba59 JD |
1687 | goto send_reply; |
1688 | ||
1689 | error: | |
c4e361a4 | 1690 | reply.status = htobe32(LTTNG_VIEWER_METADATA_ERR); |
d3e2ba59 JD |
1691 | |
1692 | send_reply: | |
eea7556c | 1693 | health_code_update(); |
7591bab1 MD |
1694 | if (vstream) { |
1695 | pthread_mutex_unlock(&vstream->stream->lock); | |
1696 | } | |
58eb9381 | 1697 | ret = send_response(conn->sock, &reply, sizeof(reply)); |
d3e2ba59 | 1698 | if (ret < 0) { |
7591bab1 | 1699 | goto end_free; |
d3e2ba59 | 1700 | } |
eea7556c | 1701 | health_code_update(); |
d3e2ba59 JD |
1702 | |
1703 | if (len > 0) { | |
58eb9381 | 1704 | ret = send_response(conn->sock, data, len); |
d3e2ba59 | 1705 | if (ret < 0) { |
7591bab1 | 1706 | goto end_free; |
d3e2ba59 JD |
1707 | } |
1708 | } | |
1709 | ||
1710 | DBG("Sent %" PRIu64 " bytes of metadata for stream %" PRIu64, len, | |
1711 | be64toh(request.stream_id)); | |
1712 | ||
1713 | DBG("Metadata sent"); | |
1714 | ||
7591bab1 | 1715 | end_free: |
d3e2ba59 | 1716 | free(data); |
d3e2ba59 | 1717 | end: |
7591bab1 MD |
1718 | if (vstream) { |
1719 | viewer_stream_put(vstream); | |
1720 | } | |
d3e2ba59 JD |
1721 | return ret; |
1722 | } | |
1723 | ||
c3b7390b JD |
1724 | /* |
1725 | * Create a viewer session. | |
1726 | * | |
1727 | * Return 0 on success or else a negative value. | |
1728 | */ | |
1729 | static | |
1730 | int viewer_create_session(struct relay_connection *conn) | |
1731 | { | |
1732 | int ret; | |
1733 | struct lttng_viewer_create_session_response resp; | |
1734 | ||
1735 | DBG("Viewer create session received"); | |
1736 | ||
53efb85a | 1737 | memset(&resp, 0, sizeof(resp)); |
c3b7390b | 1738 | resp.status = htobe32(LTTNG_VIEWER_CREATE_SESSION_OK); |
7591bab1 | 1739 | conn->viewer_session = viewer_session_create(); |
c3b7390b JD |
1740 | if (!conn->viewer_session) { |
1741 | ERR("Allocation viewer session"); | |
1742 | resp.status = htobe32(LTTNG_VIEWER_CREATE_SESSION_ERR); | |
1743 | goto send_reply; | |
1744 | } | |
c3b7390b JD |
1745 | |
1746 | send_reply: | |
1747 | health_code_update(); | |
1748 | ret = send_response(conn->sock, &resp, sizeof(resp)); | |
1749 | if (ret < 0) { | |
1750 | goto end; | |
1751 | } | |
1752 | health_code_update(); | |
1753 | ret = 0; | |
1754 | ||
1755 | end: | |
1756 | return ret; | |
1757 | } | |
1758 | ||
d62023be JD |
1759 | /* |
1760 | * Detach a viewer session. | |
1761 | * | |
1762 | * Return 0 on success or else a negative value. | |
1763 | */ | |
1764 | static | |
1765 | int viewer_detach_session(struct relay_connection *conn) | |
1766 | { | |
1767 | int ret; | |
1768 | struct lttng_viewer_detach_session_response response; | |
1769 | struct lttng_viewer_detach_session_request request; | |
1770 | struct relay_session *session = NULL; | |
1771 | uint64_t viewer_session_to_close; | |
1772 | ||
1773 | DBG("Viewer detach session received"); | |
1774 | ||
1775 | assert(conn); | |
1776 | ||
1777 | health_code_update(); | |
1778 | ||
1779 | /* Receive the request from the connected client. */ | |
1780 | ret = recv_request(conn->sock, &request, sizeof(request)); | |
1781 | if (ret < 0) { | |
1782 | goto end; | |
1783 | } | |
1784 | viewer_session_to_close = be64toh(request.session_id); | |
1785 | ||
1786 | if (!conn->viewer_session) { | |
1787 | DBG("Client trying to detach before creating a live viewer session"); | |
1788 | response.status = htobe32(LTTNG_VIEWER_DETACH_SESSION_ERR); | |
1789 | goto send_reply; | |
1790 | } | |
1791 | ||
1792 | health_code_update(); | |
1793 | ||
1794 | memset(&response, 0, sizeof(response)); | |
1795 | DBG("Detaching from session ID %" PRIu64, viewer_session_to_close); | |
1796 | ||
1797 | session = session_get_by_id(be64toh(request.session_id)); | |
1798 | if (!session) { | |
1799 | DBG("Relay session %" PRIu64 " not found", | |
1800 | be64toh(request.session_id)); | |
1801 | response.status = htobe32(LTTNG_VIEWER_DETACH_SESSION_UNK); | |
1802 | goto send_reply; | |
1803 | } | |
1804 | ||
1805 | ret = viewer_session_is_attached(conn->viewer_session, session); | |
1806 | if (ret != 1) { | |
1807 | DBG("Not attached to this session"); | |
1808 | response.status = htobe32(LTTNG_VIEWER_DETACH_SESSION_ERR); | |
1809 | goto send_reply_put; | |
1810 | } | |
1811 | ||
1812 | viewer_session_close_one_session(conn->viewer_session, session); | |
1813 | response.status = htobe32(LTTNG_VIEWER_DETACH_SESSION_OK); | |
1814 | DBG("Session %" PRIu64 " detached.", viewer_session_to_close); | |
1815 | ||
1816 | send_reply_put: | |
1817 | session_put(session); | |
1818 | ||
1819 | send_reply: | |
1820 | health_code_update(); | |
1821 | ret = send_response(conn->sock, &response, sizeof(response)); | |
1822 | if (ret < 0) { | |
1823 | goto end; | |
1824 | } | |
1825 | health_code_update(); | |
1826 | ret = 0; | |
1827 | ||
1828 | end: | |
1829 | return ret; | |
1830 | } | |
c3b7390b | 1831 | |
d3e2ba59 JD |
1832 | /* |
1833 | * live_relay_unknown_command: send -1 if received unknown command | |
1834 | */ | |
1835 | static | |
58eb9381 | 1836 | void live_relay_unknown_command(struct relay_connection *conn) |
d3e2ba59 JD |
1837 | { |
1838 | struct lttcomm_relayd_generic_reply reply; | |
d3e2ba59 | 1839 | |
53efb85a | 1840 | memset(&reply, 0, sizeof(reply)); |
d3e2ba59 | 1841 | reply.ret_code = htobe32(LTTNG_ERR_UNK); |
58eb9381 | 1842 | (void) send_response(conn->sock, &reply, sizeof(reply)); |
d3e2ba59 JD |
1843 | } |
1844 | ||
1845 | /* | |
1846 | * Process the commands received on the control socket | |
1847 | */ | |
1848 | static | |
1849 | int process_control(struct lttng_viewer_cmd *recv_hdr, | |
58eb9381 | 1850 | struct relay_connection *conn) |
d3e2ba59 JD |
1851 | { |
1852 | int ret = 0; | |
2f8f53af DG |
1853 | uint32_t msg_value; |
1854 | ||
2f8f53af DG |
1855 | msg_value = be32toh(recv_hdr->cmd); |
1856 | ||
1857 | /* | |
1858 | * Make sure we've done the version check before any command other then a | |
1859 | * new client connection. | |
1860 | */ | |
c4e361a4 | 1861 | if (msg_value != LTTNG_VIEWER_CONNECT && !conn->version_check_done) { |
58eb9381 | 1862 | ERR("Viewer conn value %" PRIu32 " before version check", msg_value); |
2f8f53af DG |
1863 | ret = -1; |
1864 | goto end; | |
1865 | } | |
d3e2ba59 | 1866 | |
2f8f53af | 1867 | switch (msg_value) { |
c4e361a4 | 1868 | case LTTNG_VIEWER_CONNECT: |
58eb9381 | 1869 | ret = viewer_connect(conn); |
d3e2ba59 | 1870 | break; |
c4e361a4 | 1871 | case LTTNG_VIEWER_LIST_SESSIONS: |
58eb9381 | 1872 | ret = viewer_list_sessions(conn); |
d3e2ba59 | 1873 | break; |
c4e361a4 | 1874 | case LTTNG_VIEWER_ATTACH_SESSION: |
58eb9381 | 1875 | ret = viewer_attach_session(conn); |
d3e2ba59 | 1876 | break; |
c4e361a4 | 1877 | case LTTNG_VIEWER_GET_NEXT_INDEX: |
58eb9381 | 1878 | ret = viewer_get_next_index(conn); |
d3e2ba59 | 1879 | break; |
c4e361a4 | 1880 | case LTTNG_VIEWER_GET_PACKET: |
58eb9381 | 1881 | ret = viewer_get_packet(conn); |
d3e2ba59 | 1882 | break; |
c4e361a4 | 1883 | case LTTNG_VIEWER_GET_METADATA: |
58eb9381 | 1884 | ret = viewer_get_metadata(conn); |
d3e2ba59 | 1885 | break; |
c4e361a4 | 1886 | case LTTNG_VIEWER_GET_NEW_STREAMS: |
58eb9381 | 1887 | ret = viewer_get_new_streams(conn); |
80e8027a | 1888 | break; |
c3b7390b JD |
1889 | case LTTNG_VIEWER_CREATE_SESSION: |
1890 | ret = viewer_create_session(conn); | |
1891 | break; | |
d62023be JD |
1892 | case LTTNG_VIEWER_DETACH_SESSION: |
1893 | ret = viewer_detach_session(conn); | |
1894 | break; | |
d3e2ba59 | 1895 | default: |
7591bab1 MD |
1896 | ERR("Received unknown viewer command (%u)", |
1897 | be32toh(recv_hdr->cmd)); | |
58eb9381 | 1898 | live_relay_unknown_command(conn); |
d3e2ba59 JD |
1899 | ret = -1; |
1900 | goto end; | |
1901 | } | |
1902 | ||
1903 | end: | |
1904 | return ret; | |
1905 | } | |
1906 | ||
1907 | static | |
58eb9381 | 1908 | void cleanup_connection_pollfd(struct lttng_poll_event *events, int pollfd) |
d3e2ba59 JD |
1909 | { |
1910 | int ret; | |
1911 | ||
58eb9381 | 1912 | (void) lttng_poll_del(events, pollfd); |
d3e2ba59 JD |
1913 | |
1914 | ret = close(pollfd); | |
1915 | if (ret < 0) { | |
1916 | ERR("Closing pollfd %d", pollfd); | |
1917 | } | |
1918 | } | |
1919 | ||
d3e2ba59 JD |
1920 | /* |
1921 | * This thread does the actual work | |
1922 | */ | |
1923 | static | |
1924 | void *thread_worker(void *data) | |
1925 | { | |
1926 | int ret, err = -1; | |
1927 | uint32_t nb_fd; | |
d3e2ba59 | 1928 | struct lttng_poll_event events; |
7591bab1 | 1929 | struct lttng_ht *viewer_connections_ht; |
d3e2ba59 JD |
1930 | struct lttng_ht_iter iter; |
1931 | struct lttng_viewer_cmd recv_hdr; | |
302d8906 | 1932 | struct relay_connection *destroy_conn; |
d3e2ba59 JD |
1933 | |
1934 | DBG("[thread] Live viewer relay worker started"); | |
1935 | ||
1936 | rcu_register_thread(); | |
1937 | ||
eea7556c MD |
1938 | health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_WORKER); |
1939 | ||
9b5e0863 MD |
1940 | if (testpoint(relayd_thread_live_worker)) { |
1941 | goto error_testpoint; | |
1942 | } | |
1943 | ||
d3e2ba59 | 1944 | /* table of connections indexed on socket */ |
7591bab1 MD |
1945 | viewer_connections_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
1946 | if (!viewer_connections_ht) { | |
1947 | goto viewer_connections_ht_error; | |
d3e2ba59 JD |
1948 | } |
1949 | ||
1950 | ret = create_thread_poll_set(&events, 2); | |
1951 | if (ret < 0) { | |
1952 | goto error_poll_create; | |
1953 | } | |
1954 | ||
58eb9381 | 1955 | ret = lttng_poll_add(&events, live_conn_pipe[0], LPOLLIN | LPOLLRDHUP); |
d3e2ba59 JD |
1956 | if (ret < 0) { |
1957 | goto error; | |
1958 | } | |
1959 | ||
1960 | restart: | |
1961 | while (1) { | |
1962 | int i; | |
1963 | ||
eea7556c MD |
1964 | health_code_update(); |
1965 | ||
d3e2ba59 JD |
1966 | /* Infinite blocking call, waiting for transmission */ |
1967 | DBG3("Relayd live viewer worker thread polling..."); | |
eea7556c | 1968 | health_poll_entry(); |
d3e2ba59 | 1969 | ret = lttng_poll_wait(&events, -1); |
eea7556c | 1970 | health_poll_exit(); |
d3e2ba59 JD |
1971 | if (ret < 0) { |
1972 | /* | |
1973 | * Restart interrupted system call. | |
1974 | */ | |
1975 | if (errno == EINTR) { | |
1976 | goto restart; | |
1977 | } | |
1978 | goto error; | |
1979 | } | |
1980 | ||
1981 | nb_fd = ret; | |
1982 | ||
1983 | /* | |
1984 | * Process control. The control connection is prioritised so we don't | |
1985 | * starve it with high throughput tracing data on the data | |
1986 | * connection. | |
1987 | */ | |
1988 | for (i = 0; i < nb_fd; i++) { | |
1989 | /* Fetch once the poll data */ | |
1990 | uint32_t revents = LTTNG_POLL_GETEV(&events, i); | |
1991 | int pollfd = LTTNG_POLL_GETFD(&events, i); | |
1992 | ||
eea7556c MD |
1993 | health_code_update(); |
1994 | ||
fd20dac9 MD |
1995 | if (!revents) { |
1996 | /* No activity for this FD (poll implementation). */ | |
1997 | continue; | |
1998 | } | |
1999 | ||
d3e2ba59 | 2000 | /* Thread quit pipe has been closed. Killing thread. */ |
bcf4a440 | 2001 | ret = check_thread_quit_pipe(pollfd, revents); |
d3e2ba59 JD |
2002 | if (ret) { |
2003 | err = 0; | |
2004 | goto exit; | |
2005 | } | |
2006 | ||
7591bab1 | 2007 | /* Inspect the relay conn pipe for new connection. */ |
58eb9381 | 2008 | if (pollfd == live_conn_pipe[0]) { |
03e43155 | 2009 | if (revents & LPOLLIN) { |
302d8906 JG |
2010 | struct relay_connection *conn; |
2011 | ||
7591bab1 MD |
2012 | ret = lttng_read(live_conn_pipe[0], |
2013 | &conn, sizeof(conn)); | |
d3e2ba59 JD |
2014 | if (ret < 0) { |
2015 | goto error; | |
2016 | } | |
58eb9381 DG |
2017 | lttng_poll_add(&events, conn->sock->fd, |
2018 | LPOLLIN | LPOLLRDHUP); | |
7591bab1 MD |
2019 | connection_ht_add(viewer_connections_ht, conn); |
2020 | DBG("Connection socket %d added to poll", conn->sock->fd); | |
03e43155 MD |
2021 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
2022 | ERR("Relay live pipe error"); | |
2023 | goto error; | |
2024 | } else { | |
2025 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
2026 | goto error; | |
d3e2ba59 | 2027 | } |
58eb9381 | 2028 | } else { |
7591bab1 | 2029 | /* Connection activity. */ |
302d8906 JG |
2030 | struct relay_connection *conn; |
2031 | ||
7591bab1 MD |
2032 | conn = connection_get_by_sock(viewer_connections_ht, pollfd); |
2033 | if (!conn) { | |
2034 | continue; | |
2035 | } | |
58eb9381 | 2036 | |
03e43155 | 2037 | if (revents & LPOLLIN) { |
58eb9381 DG |
2038 | ret = conn->sock->ops->recvmsg(conn->sock, &recv_hdr, |
2039 | sizeof(recv_hdr), 0); | |
d3e2ba59 | 2040 | if (ret <= 0) { |
7591bab1 | 2041 | /* Connection closed. */ |
58eb9381 | 2042 | cleanup_connection_pollfd(&events, pollfd); |
7591bab1 MD |
2043 | /* Put "create" ownership reference. */ |
2044 | connection_put(conn); | |
58eb9381 | 2045 | DBG("Viewer control conn closed with %d", pollfd); |
d3e2ba59 | 2046 | } else { |
58eb9381 | 2047 | ret = process_control(&recv_hdr, conn); |
d3e2ba59 JD |
2048 | if (ret < 0) { |
2049 | /* Clear the session on error. */ | |
58eb9381 | 2050 | cleanup_connection_pollfd(&events, pollfd); |
7591bab1 MD |
2051 | /* Put "create" ownership reference. */ |
2052 | connection_put(conn); | |
d3e2ba59 JD |
2053 | DBG("Viewer connection closed with %d", pollfd); |
2054 | } | |
2055 | } | |
03e43155 MD |
2056 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
2057 | cleanup_connection_pollfd(&events, pollfd); | |
2058 | /* Put "create" ownership reference. */ | |
2059 | connection_put(conn); | |
2060 | } else { | |
2061 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
2062 | connection_put(conn); | |
2063 | goto error; | |
d3e2ba59 | 2064 | } |
7591bab1 MD |
2065 | /* Put local "get_by_sock" reference. */ |
2066 | connection_put(conn); | |
d3e2ba59 JD |
2067 | } |
2068 | } | |
2069 | } | |
2070 | ||
2071 | exit: | |
2072 | error: | |
2073 | lttng_poll_clean(&events); | |
2074 | ||
58eb9381 | 2075 | /* Cleanup reamaining connection object. */ |
d3e2ba59 | 2076 | rcu_read_lock(); |
7591bab1 | 2077 | cds_lfht_for_each_entry(viewer_connections_ht->ht, &iter.iter, |
302d8906 | 2078 | destroy_conn, |
58eb9381 | 2079 | sock_n.node) { |
eea7556c | 2080 | health_code_update(); |
7591bab1 | 2081 | connection_put(destroy_conn); |
d3e2ba59 JD |
2082 | } |
2083 | rcu_read_unlock(); | |
2084 | error_poll_create: | |
7591bab1 MD |
2085 | lttng_ht_destroy(viewer_connections_ht); |
2086 | viewer_connections_ht_error: | |
58eb9381 | 2087 | /* Close relay conn pipes */ |
590e9039 | 2088 | (void) fd_tracker_util_pipe_close(the_fd_tracker, live_conn_pipe); |
d3e2ba59 JD |
2089 | if (err) { |
2090 | DBG("Viewer worker thread exited with error"); | |
2091 | } | |
2092 | DBG("Viewer worker thread cleanup complete"); | |
9b5e0863 | 2093 | error_testpoint: |
eea7556c MD |
2094 | if (err) { |
2095 | health_error(); | |
2096 | ERR("Health error occurred in %s", __func__); | |
2097 | } | |
2098 | health_unregister(health_relayd); | |
b4aacfdc MD |
2099 | if (lttng_relay_stop_threads()) { |
2100 | ERR("Error stopping threads"); | |
178a0557 | 2101 | } |
d3e2ba59 JD |
2102 | rcu_unregister_thread(); |
2103 | return NULL; | |
2104 | } | |
2105 | ||
2106 | /* | |
2107 | * Create the relay command pipe to wake thread_manage_apps. | |
2108 | * Closed in cleanup(). | |
2109 | */ | |
58eb9381 | 2110 | static int create_conn_pipe(void) |
d3e2ba59 | 2111 | { |
590e9039 JG |
2112 | return fd_tracker_util_pipe_open_cloexec(the_fd_tracker, |
2113 | "Live connection pipe", live_conn_pipe); | |
178a0557 | 2114 | } |
d3e2ba59 | 2115 | |
178a0557 | 2116 | int relayd_live_join(void) |
d3e2ba59 | 2117 | { |
178a0557 | 2118 | int ret, retval = 0; |
d3e2ba59 JD |
2119 | void *status; |
2120 | ||
d3e2ba59 | 2121 | ret = pthread_join(live_listener_thread, &status); |
178a0557 MD |
2122 | if (ret) { |
2123 | errno = ret; | |
d3e2ba59 | 2124 | PERROR("pthread_join live listener"); |
178a0557 | 2125 | retval = -1; |
d3e2ba59 JD |
2126 | } |
2127 | ||
2128 | ret = pthread_join(live_worker_thread, &status); | |
178a0557 MD |
2129 | if (ret) { |
2130 | errno = ret; | |
d3e2ba59 | 2131 | PERROR("pthread_join live worker"); |
178a0557 | 2132 | retval = -1; |
d3e2ba59 JD |
2133 | } |
2134 | ||
2135 | ret = pthread_join(live_dispatcher_thread, &status); | |
178a0557 MD |
2136 | if (ret) { |
2137 | errno = ret; | |
d3e2ba59 | 2138 | PERROR("pthread_join live dispatcher"); |
178a0557 | 2139 | retval = -1; |
d3e2ba59 JD |
2140 | } |
2141 | ||
178a0557 | 2142 | cleanup_relayd_live(); |
d3e2ba59 | 2143 | |
178a0557 | 2144 | return retval; |
d3e2ba59 JD |
2145 | } |
2146 | ||
2147 | /* | |
2148 | * main | |
2149 | */ | |
7591bab1 | 2150 | int relayd_live_create(struct lttng_uri *uri) |
d3e2ba59 | 2151 | { |
178a0557 | 2152 | int ret = 0, retval = 0; |
d3e2ba59 JD |
2153 | void *status; |
2154 | int is_root; | |
2155 | ||
178a0557 MD |
2156 | if (!uri) { |
2157 | retval = -1; | |
2158 | goto exit_init_data; | |
2159 | } | |
d3e2ba59 JD |
2160 | live_uri = uri; |
2161 | ||
d3e2ba59 JD |
2162 | /* Check if daemon is UID = 0 */ |
2163 | is_root = !getuid(); | |
2164 | ||
2165 | if (!is_root) { | |
2166 | if (live_uri->port < 1024) { | |
2167 | ERR("Need to be root to use ports < 1024"); | |
178a0557 MD |
2168 | retval = -1; |
2169 | goto exit_init_data; | |
d3e2ba59 JD |
2170 | } |
2171 | } | |
2172 | ||
2173 | /* Setup the thread apps communication pipe. */ | |
178a0557 MD |
2174 | if (create_conn_pipe()) { |
2175 | retval = -1; | |
2176 | goto exit_init_data; | |
d3e2ba59 JD |
2177 | } |
2178 | ||
2179 | /* Init relay command queue. */ | |
8bdee6e2 | 2180 | cds_wfcq_init(&viewer_conn_queue.head, &viewer_conn_queue.tail); |
d3e2ba59 JD |
2181 | |
2182 | /* Set up max poll set size */ | |
25b397f9 MD |
2183 | if (lttng_poll_set_max_size()) { |
2184 | retval = -1; | |
2185 | goto exit_init_data; | |
2186 | } | |
d3e2ba59 JD |
2187 | |
2188 | /* Setup the dispatcher thread */ | |
1a1a34b4 | 2189 | ret = pthread_create(&live_dispatcher_thread, default_pthread_attr(), |
d3e2ba59 | 2190 | thread_dispatcher, (void *) NULL); |
178a0557 MD |
2191 | if (ret) { |
2192 | errno = ret; | |
d3e2ba59 | 2193 | PERROR("pthread_create viewer dispatcher"); |
178a0557 MD |
2194 | retval = -1; |
2195 | goto exit_dispatcher_thread; | |
d3e2ba59 JD |
2196 | } |
2197 | ||
2198 | /* Setup the worker thread */ | |
1a1a34b4 | 2199 | ret = pthread_create(&live_worker_thread, default_pthread_attr(), |
7591bab1 | 2200 | thread_worker, NULL); |
178a0557 MD |
2201 | if (ret) { |
2202 | errno = ret; | |
d3e2ba59 | 2203 | PERROR("pthread_create viewer worker"); |
178a0557 MD |
2204 | retval = -1; |
2205 | goto exit_worker_thread; | |
d3e2ba59 JD |
2206 | } |
2207 | ||
2208 | /* Setup the listener thread */ | |
1a1a34b4 | 2209 | ret = pthread_create(&live_listener_thread, default_pthread_attr(), |
d3e2ba59 | 2210 | thread_listener, (void *) NULL); |
178a0557 MD |
2211 | if (ret) { |
2212 | errno = ret; | |
d3e2ba59 | 2213 | PERROR("pthread_create viewer listener"); |
178a0557 MD |
2214 | retval = -1; |
2215 | goto exit_listener_thread; | |
d3e2ba59 JD |
2216 | } |
2217 | ||
178a0557 MD |
2218 | /* |
2219 | * All OK, started all threads. | |
2220 | */ | |
2221 | return retval; | |
2222 | ||
9911d21b JG |
2223 | /* |
2224 | * Join on the live_listener_thread should anything be added after | |
2225 | * the live_listener thread's creation. | |
2226 | */ | |
d3e2ba59 | 2227 | |
178a0557 | 2228 | exit_listener_thread: |
d3e2ba59 | 2229 | |
d3e2ba59 | 2230 | ret = pthread_join(live_worker_thread, &status); |
178a0557 MD |
2231 | if (ret) { |
2232 | errno = ret; | |
d3e2ba59 | 2233 | PERROR("pthread_join live worker"); |
178a0557 | 2234 | retval = -1; |
d3e2ba59 | 2235 | } |
178a0557 | 2236 | exit_worker_thread: |
d3e2ba59 | 2237 | |
d3e2ba59 | 2238 | ret = pthread_join(live_dispatcher_thread, &status); |
178a0557 MD |
2239 | if (ret) { |
2240 | errno = ret; | |
d3e2ba59 | 2241 | PERROR("pthread_join live dispatcher"); |
178a0557 | 2242 | retval = -1; |
d3e2ba59 | 2243 | } |
178a0557 | 2244 | exit_dispatcher_thread: |
d3e2ba59 | 2245 | |
178a0557 MD |
2246 | exit_init_data: |
2247 | cleanup_relayd_live(); | |
d3e2ba59 | 2248 | |
178a0557 | 2249 | return retval; |
d3e2ba59 | 2250 | } |