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, | |
c06fdd95 | 200 | uint64_t session_id, unsigned int ignore_sent_flag) |
2f8f53af DG |
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. */ |
c06fdd95 | 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 | * | |
c06fdd95 JG |
274 | * session must be locked to ensure that we see either none or all initial |
275 | * streams for a session, but no intermediate state.. | |
276 | * | |
2f8f53af DG |
277 | * Return 0 on success or else a negative value. |
278 | */ | |
b66a15d1 JG |
279 | static int make_viewer_streams(struct relay_session *session, |
280 | struct lttng_trace_chunk *viewer_trace_chunk, | |
281 | enum lttng_viewer_seek seek_t, | |
282 | uint32_t *nb_total, | |
283 | uint32_t *nb_unsent, | |
284 | uint32_t *nb_created, | |
285 | bool *closed) | |
2f8f53af DG |
286 | { |
287 | int ret; | |
2f8f53af | 288 | struct lttng_ht_iter iter; |
2a174661 | 289 | struct ctf_trace *ctf_trace; |
2f8f53af DG |
290 | |
291 | assert(session); | |
c06fdd95 | 292 | ASSERT_LOCKED(session->lock); |
2f8f53af | 293 | |
dbd6665b JG |
294 | if (!viewer_trace_chunk) { |
295 | ERR("Internal error: viewer session associated with session \"%s\" has a NULL trace chunk", | |
296 | session->session_name); | |
297 | ret = -1; | |
298 | goto error; | |
299 | } | |
300 | ||
bddf80e4 MD |
301 | if (session->connection_closed) { |
302 | *closed = true; | |
303 | } | |
304 | ||
2f8f53af | 305 | /* |
7591bab1 MD |
306 | * Create viewer streams for relay streams that are ready to be |
307 | * used for a the given session id only. | |
2f8f53af | 308 | */ |
2a174661 DG |
309 | rcu_read_lock(); |
310 | cds_lfht_for_each_entry(session->ctf_traces_ht->ht, &iter.iter, ctf_trace, | |
311 | node.node) { | |
312 | struct relay_stream *stream; | |
2f8f53af DG |
313 | |
314 | health_code_update(); | |
315 | ||
7591bab1 | 316 | if (!ctf_trace_get(ctf_trace)) { |
2f8f53af DG |
317 | continue; |
318 | } | |
319 | ||
7591bab1 | 320 | cds_list_for_each_entry_rcu(stream, &ctf_trace->stream_list, stream_node) { |
2a174661 DG |
321 | struct relay_viewer_stream *vstream; |
322 | ||
7591bab1 | 323 | if (!stream_get(stream)) { |
2a174661 DG |
324 | continue; |
325 | } | |
7591bab1 | 326 | /* |
d812ecb9 | 327 | * stream published is protected by the session lock. |
7591bab1 MD |
328 | */ |
329 | if (!stream->published) { | |
330 | goto next; | |
331 | } | |
332 | vstream = viewer_stream_get_by_id(stream->stream_handle); | |
2f8f53af | 333 | if (!vstream) { |
b66a15d1 JG |
334 | vstream = viewer_stream_create(stream, |
335 | viewer_trace_chunk, seek_t); | |
2a174661 DG |
336 | if (!vstream) { |
337 | ret = -1; | |
7591bab1 MD |
338 | ctf_trace_put(ctf_trace); |
339 | stream_put(stream); | |
2a174661 DG |
340 | goto error_unlock; |
341 | } | |
2a174661 DG |
342 | |
343 | if (nb_created) { | |
344 | /* Update number of created stream counter. */ | |
345 | (*nb_created)++; | |
346 | } | |
2229a09c MD |
347 | /* |
348 | * Ensure a self-reference is preserved even | |
349 | * after we have put our local reference. | |
350 | */ | |
862d3a3b MD |
351 | if (!viewer_stream_get(vstream)) { |
352 | ERR("Unable to get self-reference on viewer stream, logic error."); | |
353 | abort(); | |
354 | } | |
7591bab1 MD |
355 | } else { |
356 | if (!vstream->sent_flag && nb_unsent) { | |
357 | /* Update number of unsent stream counter. */ | |
358 | (*nb_unsent)++; | |
359 | } | |
2f8f53af | 360 | } |
2a174661 DG |
361 | /* Update number of total stream counter. */ |
362 | if (nb_total) { | |
2229a09c MD |
363 | if (stream->is_metadata) { |
364 | if (!stream->closed || | |
365 | stream->metadata_received > vstream->metadata_sent) { | |
366 | (*nb_total)++; | |
367 | } | |
368 | } else { | |
369 | if (!stream->closed || | |
a8f9f353 | 370 | !(((int64_t) (stream->prev_data_seq - stream->last_net_seq_num)) >= 0)) { |
2229a09c MD |
371 | |
372 | (*nb_total)++; | |
373 | } | |
374 | } | |
2f8f53af | 375 | } |
2229a09c MD |
376 | /* Put local reference. */ |
377 | viewer_stream_put(vstream); | |
7591bab1 MD |
378 | next: |
379 | stream_put(stream); | |
2f8f53af | 380 | } |
7591bab1 | 381 | ctf_trace_put(ctf_trace); |
2f8f53af DG |
382 | } |
383 | ||
384 | ret = 0; | |
385 | ||
386 | error_unlock: | |
2a174661 | 387 | rcu_read_unlock(); |
dbd6665b | 388 | error: |
2f8f53af DG |
389 | return ret; |
390 | } | |
391 | ||
b4aacfdc | 392 | int relayd_live_stop(void) |
d3e2ba59 | 393 | { |
b4aacfdc | 394 | /* Stop dispatch thread */ |
d3e2ba59 | 395 | CMM_STORE_SHARED(live_dispatch_thread_exit, 1); |
58eb9381 | 396 | futex_nto1_wake(&viewer_conn_queue.futex); |
b4aacfdc | 397 | return 0; |
d3e2ba59 JD |
398 | } |
399 | ||
d3e2ba59 JD |
400 | /* |
401 | * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set. | |
402 | */ | |
403 | static | |
404 | int create_thread_poll_set(struct lttng_poll_event *events, int size) | |
405 | { | |
406 | int ret; | |
407 | ||
408 | if (events == NULL || size == 0) { | |
409 | ret = -1; | |
410 | goto error; | |
411 | } | |
412 | ||
413 | ret = lttng_poll_create(events, size, LTTNG_CLOEXEC); | |
414 | if (ret < 0) { | |
415 | goto error; | |
416 | } | |
417 | ||
418 | /* Add quit pipe */ | |
bcf4a440 | 419 | ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN | LPOLLERR); |
d3e2ba59 JD |
420 | if (ret < 0) { |
421 | goto error; | |
422 | } | |
423 | ||
424 | return 0; | |
425 | ||
426 | error: | |
427 | return ret; | |
428 | } | |
429 | ||
430 | /* | |
431 | * Check if the thread quit pipe was triggered. | |
432 | * | |
433 | * Return 1 if it was triggered else 0; | |
434 | */ | |
435 | static | |
bcf4a440 | 436 | int check_thread_quit_pipe(int fd, uint32_t events) |
d3e2ba59 | 437 | { |
bcf4a440 | 438 | if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) { |
d3e2ba59 JD |
439 | return 1; |
440 | } | |
441 | ||
442 | return 0; | |
443 | } | |
444 | ||
445 | /* | |
446 | * Create and init socket from uri. | |
447 | */ | |
448 | static | |
449 | struct lttcomm_sock *init_socket(struct lttng_uri *uri) | |
450 | { | |
451 | int ret; | |
452 | struct lttcomm_sock *sock = NULL; | |
453 | ||
454 | sock = lttcomm_alloc_sock_from_uri(uri); | |
455 | if (sock == NULL) { | |
456 | ERR("Allocating socket"); | |
457 | goto error; | |
458 | } | |
459 | ||
460 | ret = lttcomm_create_sock(sock); | |
461 | if (ret < 0) { | |
462 | goto error; | |
463 | } | |
2288467f | 464 | DBG("Listening on sock %d for lttng-live", sock->fd); |
d3e2ba59 JD |
465 | |
466 | ret = sock->ops->bind(sock); | |
467 | if (ret < 0) { | |
2288467f | 468 | PERROR("Failed to bind lttng-live socket"); |
d3e2ba59 JD |
469 | goto error; |
470 | } | |
471 | ||
472 | ret = sock->ops->listen(sock, -1); | |
473 | if (ret < 0) { | |
474 | goto error; | |
475 | ||
476 | } | |
477 | ||
478 | return sock; | |
479 | ||
480 | error: | |
481 | if (sock) { | |
482 | lttcomm_destroy_sock(sock); | |
483 | } | |
484 | return NULL; | |
485 | } | |
486 | ||
487 | /* | |
488 | * This thread manages the listening for new connections on the network | |
489 | */ | |
490 | static | |
491 | void *thread_listener(void *data) | |
492 | { | |
493 | int i, ret, pollfd, err = -1; | |
d3e2ba59 JD |
494 | uint32_t revents, nb_fd; |
495 | struct lttng_poll_event events; | |
496 | struct lttcomm_sock *live_control_sock; | |
497 | ||
498 | DBG("[thread] Relay live listener started"); | |
499 | ||
eea7556c MD |
500 | health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_LISTENER); |
501 | ||
502 | health_code_update(); | |
503 | ||
d3e2ba59 JD |
504 | live_control_sock = init_socket(live_uri); |
505 | if (!live_control_sock) { | |
506 | goto error_sock_control; | |
507 | } | |
508 | ||
fb4d42ab | 509 | /* Pass 2 as size here for the thread quit pipe and control sockets. */ |
d3e2ba59 JD |
510 | ret = create_thread_poll_set(&events, 2); |
511 | if (ret < 0) { | |
512 | goto error_create_poll; | |
513 | } | |
514 | ||
515 | /* Add the control socket */ | |
516 | ret = lttng_poll_add(&events, live_control_sock->fd, LPOLLIN | LPOLLRDHUP); | |
517 | if (ret < 0) { | |
518 | goto error_poll_add; | |
519 | } | |
520 | ||
3fd27398 MD |
521 | lttng_relay_notify_ready(); |
522 | ||
9b5e0863 MD |
523 | if (testpoint(relayd_thread_live_listener)) { |
524 | goto error_testpoint; | |
525 | } | |
526 | ||
d3e2ba59 | 527 | while (1) { |
eea7556c MD |
528 | health_code_update(); |
529 | ||
d3e2ba59 JD |
530 | DBG("Listener accepting live viewers connections"); |
531 | ||
532 | restart: | |
eea7556c | 533 | health_poll_entry(); |
d3e2ba59 | 534 | ret = lttng_poll_wait(&events, -1); |
eea7556c | 535 | health_poll_exit(); |
d3e2ba59 JD |
536 | if (ret < 0) { |
537 | /* | |
538 | * Restart interrupted system call. | |
539 | */ | |
540 | if (errno == EINTR) { | |
541 | goto restart; | |
542 | } | |
543 | goto error; | |
544 | } | |
545 | nb_fd = ret; | |
546 | ||
547 | DBG("Relay new viewer connection received"); | |
548 | for (i = 0; i < nb_fd; i++) { | |
eea7556c MD |
549 | health_code_update(); |
550 | ||
d3e2ba59 JD |
551 | /* Fetch once the poll data */ |
552 | revents = LTTNG_POLL_GETEV(&events, i); | |
553 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
554 | ||
555 | /* Thread quit pipe has been closed. Killing thread. */ | |
bcf4a440 | 556 | ret = check_thread_quit_pipe(pollfd, revents); |
d3e2ba59 JD |
557 | if (ret) { |
558 | err = 0; | |
559 | goto exit; | |
560 | } | |
561 | ||
03e43155 | 562 | if (revents & LPOLLIN) { |
d3e2ba59 | 563 | /* |
7591bab1 MD |
564 | * A new connection is requested, therefore a |
565 | * viewer connection is allocated in this | |
566 | * thread, enqueued to a global queue and | |
567 | * dequeued (and freed) in the worker thread. | |
d3e2ba59 | 568 | */ |
58eb9381 DG |
569 | int val = 1; |
570 | struct relay_connection *new_conn; | |
d3e2ba59 JD |
571 | struct lttcomm_sock *newsock; |
572 | ||
d3e2ba59 JD |
573 | newsock = live_control_sock->ops->accept(live_control_sock); |
574 | if (!newsock) { | |
575 | PERROR("accepting control sock"); | |
d3e2ba59 JD |
576 | goto error; |
577 | } | |
578 | DBG("Relay viewer connection accepted socket %d", newsock->fd); | |
58eb9381 | 579 | |
d3e2ba59 | 580 | ret = setsockopt(newsock->fd, SOL_SOCKET, SO_REUSEADDR, &val, |
58eb9381 | 581 | sizeof(val)); |
d3e2ba59 JD |
582 | if (ret < 0) { |
583 | PERROR("setsockopt inet"); | |
584 | lttcomm_destroy_sock(newsock); | |
d3e2ba59 JD |
585 | goto error; |
586 | } | |
7591bab1 MD |
587 | new_conn = connection_create(newsock, RELAY_CONNECTION_UNKNOWN); |
588 | if (!new_conn) { | |
589 | lttcomm_destroy_sock(newsock); | |
590 | goto error; | |
591 | } | |
592 | /* Ownership assumed by the connection. */ | |
593 | newsock = NULL; | |
d3e2ba59 | 594 | |
58eb9381 | 595 | /* Enqueue request for the dispatcher thread. */ |
8bdee6e2 SM |
596 | cds_wfcq_enqueue(&viewer_conn_queue.head, &viewer_conn_queue.tail, |
597 | &new_conn->qnode); | |
d3e2ba59 JD |
598 | |
599 | /* | |
7591bab1 MD |
600 | * Wake the dispatch queue futex. |
601 | * Implicit memory barrier with the | |
602 | * exchange in cds_wfcq_enqueue. | |
d3e2ba59 | 603 | */ |
58eb9381 | 604 | futex_nto1_wake(&viewer_conn_queue.futex); |
03e43155 MD |
605 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
606 | ERR("socket poll error"); | |
607 | goto error; | |
608 | } else { | |
609 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
610 | goto error; | |
d3e2ba59 JD |
611 | } |
612 | } | |
613 | } | |
614 | ||
615 | exit: | |
616 | error: | |
617 | error_poll_add: | |
9b5e0863 | 618 | error_testpoint: |
d3e2ba59 JD |
619 | lttng_poll_clean(&events); |
620 | error_create_poll: | |
621 | if (live_control_sock->fd >= 0) { | |
622 | ret = live_control_sock->ops->close(live_control_sock); | |
623 | if (ret) { | |
624 | PERROR("close"); | |
625 | } | |
626 | } | |
627 | lttcomm_destroy_sock(live_control_sock); | |
628 | error_sock_control: | |
629 | if (err) { | |
eea7556c | 630 | health_error(); |
d3e2ba59 JD |
631 | DBG("Live viewer listener thread exited with error"); |
632 | } | |
eea7556c | 633 | health_unregister(health_relayd); |
d3e2ba59 | 634 | DBG("Live viewer listener thread cleanup complete"); |
b4aacfdc MD |
635 | if (lttng_relay_stop_threads()) { |
636 | ERR("Error stopping threads"); | |
178a0557 | 637 | } |
d3e2ba59 JD |
638 | return NULL; |
639 | } | |
640 | ||
641 | /* | |
642 | * This thread manages the dispatching of the requests to worker threads | |
643 | */ | |
644 | static | |
645 | void *thread_dispatcher(void *data) | |
646 | { | |
6cd525e8 MD |
647 | int err = -1; |
648 | ssize_t ret; | |
8bdee6e2 | 649 | struct cds_wfcq_node *node; |
58eb9381 | 650 | struct relay_connection *conn = NULL; |
d3e2ba59 JD |
651 | |
652 | DBG("[thread] Live viewer relay dispatcher started"); | |
653 | ||
eea7556c MD |
654 | health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_DISPATCHER); |
655 | ||
9b5e0863 MD |
656 | if (testpoint(relayd_thread_live_dispatcher)) { |
657 | goto error_testpoint; | |
658 | } | |
659 | ||
eea7556c MD |
660 | health_code_update(); |
661 | ||
0ed3b1a8 | 662 | for (;;) { |
eea7556c MD |
663 | health_code_update(); |
664 | ||
d3e2ba59 | 665 | /* Atomically prepare the queue futex */ |
58eb9381 | 666 | futex_nto1_prepare(&viewer_conn_queue.futex); |
d3e2ba59 | 667 | |
0ed3b1a8 MD |
668 | if (CMM_LOAD_SHARED(live_dispatch_thread_exit)) { |
669 | break; | |
670 | } | |
671 | ||
d3e2ba59 | 672 | do { |
eea7556c MD |
673 | health_code_update(); |
674 | ||
d3e2ba59 | 675 | /* Dequeue commands */ |
8bdee6e2 SM |
676 | node = cds_wfcq_dequeue_blocking(&viewer_conn_queue.head, |
677 | &viewer_conn_queue.tail); | |
d3e2ba59 JD |
678 | if (node == NULL) { |
679 | DBG("Woken up but nothing in the live-viewer " | |
680 | "relay command queue"); | |
681 | /* Continue thread execution */ | |
682 | break; | |
683 | } | |
58eb9381 | 684 | conn = caa_container_of(node, struct relay_connection, qnode); |
d3e2ba59 | 685 | DBG("Dispatching viewer request waiting on sock %d", |
58eb9381 | 686 | conn->sock->fd); |
d3e2ba59 JD |
687 | |
688 | /* | |
7591bab1 MD |
689 | * Inform worker thread of the new request. This |
690 | * call is blocking so we can be assured that | |
691 | * the data will be read at some point in time | |
692 | * or wait to the end of the world :) | |
d3e2ba59 | 693 | */ |
58eb9381 DG |
694 | ret = lttng_write(live_conn_pipe[1], &conn, sizeof(conn)); |
695 | if (ret < 0) { | |
696 | PERROR("write conn pipe"); | |
7591bab1 | 697 | connection_put(conn); |
d3e2ba59 JD |
698 | goto error; |
699 | } | |
700 | } while (node != NULL); | |
701 | ||
702 | /* Futex wait on queue. Blocking call on futex() */ | |
eea7556c | 703 | health_poll_entry(); |
58eb9381 | 704 | futex_nto1_wait(&viewer_conn_queue.futex); |
eea7556c | 705 | health_poll_exit(); |
d3e2ba59 JD |
706 | } |
707 | ||
eea7556c MD |
708 | /* Normal exit, no error */ |
709 | err = 0; | |
710 | ||
d3e2ba59 | 711 | error: |
9b5e0863 | 712 | error_testpoint: |
eea7556c MD |
713 | if (err) { |
714 | health_error(); | |
715 | ERR("Health error occurred in %s", __func__); | |
716 | } | |
717 | health_unregister(health_relayd); | |
d3e2ba59 | 718 | DBG("Live viewer dispatch thread dying"); |
b4aacfdc MD |
719 | if (lttng_relay_stop_threads()) { |
720 | ERR("Error stopping threads"); | |
178a0557 | 721 | } |
d3e2ba59 JD |
722 | return NULL; |
723 | } | |
724 | ||
725 | /* | |
726 | * Establish connection with the viewer and check the versions. | |
727 | * | |
728 | * Return 0 on success or else negative value. | |
729 | */ | |
730 | static | |
58eb9381 | 731 | int viewer_connect(struct relay_connection *conn) |
d3e2ba59 JD |
732 | { |
733 | int ret; | |
734 | struct lttng_viewer_connect reply, msg; | |
735 | ||
58eb9381 | 736 | conn->version_check_done = 1; |
d3e2ba59 | 737 | |
eea7556c MD |
738 | health_code_update(); |
739 | ||
2f8f53af DG |
740 | DBG("Viewer is establishing a connection to the relayd."); |
741 | ||
58eb9381 | 742 | ret = recv_request(conn->sock, &msg, sizeof(msg)); |
2f8f53af | 743 | if (ret < 0) { |
d3e2ba59 JD |
744 | goto end; |
745 | } | |
746 | ||
eea7556c MD |
747 | health_code_update(); |
748 | ||
f46b2ce6 | 749 | memset(&reply, 0, sizeof(reply)); |
d3e2ba59 JD |
750 | reply.major = RELAYD_VERSION_COMM_MAJOR; |
751 | reply.minor = RELAYD_VERSION_COMM_MINOR; | |
752 | ||
753 | /* Major versions must be the same */ | |
754 | if (reply.major != be32toh(msg.major)) { | |
2f8f53af DG |
755 | DBG("Incompatible major versions ([relayd] %u vs [client] %u)", |
756 | reply.major, be32toh(msg.major)); | |
72180669 | 757 | ret = -1; |
d3e2ba59 JD |
758 | goto end; |
759 | } | |
760 | ||
58eb9381 | 761 | conn->major = reply.major; |
d3e2ba59 JD |
762 | /* We adapt to the lowest compatible version */ |
763 | if (reply.minor <= be32toh(msg.minor)) { | |
58eb9381 | 764 | conn->minor = reply.minor; |
d3e2ba59 | 765 | } else { |
58eb9381 | 766 | conn->minor = be32toh(msg.minor); |
d3e2ba59 JD |
767 | } |
768 | ||
c4e361a4 | 769 | if (be32toh(msg.type) == LTTNG_VIEWER_CLIENT_COMMAND) { |
58eb9381 | 770 | conn->type = RELAY_VIEWER_COMMAND; |
c4e361a4 | 771 | } else if (be32toh(msg.type) == LTTNG_VIEWER_CLIENT_NOTIFICATION) { |
58eb9381 | 772 | conn->type = RELAY_VIEWER_NOTIFICATION; |
d3e2ba59 JD |
773 | } else { |
774 | ERR("Unknown connection type : %u", be32toh(msg.type)); | |
775 | ret = -1; | |
776 | goto end; | |
777 | } | |
778 | ||
779 | reply.major = htobe32(reply.major); | |
780 | reply.minor = htobe32(reply.minor); | |
58eb9381 | 781 | if (conn->type == RELAY_VIEWER_COMMAND) { |
93b4787b | 782 | /* |
7591bab1 MD |
783 | * Increment outside of htobe64 macro, because the argument can |
784 | * be used more than once within the macro, and thus the | |
785 | * operation may be undefined. | |
93b4787b | 786 | */ |
7591bab1 | 787 | pthread_mutex_lock(&last_relay_viewer_session_id_lock); |
93b4787b | 788 | last_relay_viewer_session_id++; |
7591bab1 | 789 | pthread_mutex_unlock(&last_relay_viewer_session_id_lock); |
93b4787b | 790 | reply.viewer_session_id = htobe64(last_relay_viewer_session_id); |
d3e2ba59 | 791 | } |
eea7556c MD |
792 | |
793 | health_code_update(); | |
794 | ||
58eb9381 | 795 | ret = send_response(conn->sock, &reply, sizeof(reply)); |
d3e2ba59 | 796 | if (ret < 0) { |
2f8f53af | 797 | goto end; |
d3e2ba59 JD |
798 | } |
799 | ||
eea7556c MD |
800 | health_code_update(); |
801 | ||
58eb9381 | 802 | DBG("Version check done using protocol %u.%u", conn->major, conn->minor); |
d3e2ba59 JD |
803 | ret = 0; |
804 | ||
805 | end: | |
806 | return ret; | |
807 | } | |
808 | ||
809 | /* | |
810 | * Send the viewer the list of current sessions. | |
7591bab1 MD |
811 | * We need to create a copy of the hash table content because otherwise |
812 | * we cannot assume the number of entries stays the same between getting | |
813 | * the number of HT elements and iteration over the HT. | |
d3e2ba59 JD |
814 | * |
815 | * Return 0 on success or else a negative value. | |
816 | */ | |
817 | static | |
58eb9381 | 818 | int viewer_list_sessions(struct relay_connection *conn) |
d3e2ba59 | 819 | { |
5f10c6b1 | 820 | int ret = 0; |
d3e2ba59 | 821 | struct lttng_viewer_list_sessions session_list; |
d3e2ba59 | 822 | struct lttng_ht_iter iter; |
d3e2ba59 | 823 | struct relay_session *session; |
7591bab1 MD |
824 | struct lttng_viewer_session *send_session_buf = NULL; |
825 | uint32_t buf_count = SESSION_BUF_DEFAULT_COUNT; | |
826 | uint32_t count = 0; | |
d3e2ba59 JD |
827 | |
828 | DBG("List sessions received"); | |
829 | ||
7591bab1 MD |
830 | send_session_buf = zmalloc(SESSION_BUF_DEFAULT_COUNT * sizeof(*send_session_buf)); |
831 | if (!send_session_buf) { | |
832 | return -1; | |
d3e2ba59 JD |
833 | } |
834 | ||
7591bab1 MD |
835 | rcu_read_lock(); |
836 | cds_lfht_for_each_entry(sessions_ht->ht, &iter.iter, session, | |
2f8f53af | 837 | session_n.node) { |
7591bab1 | 838 | struct lttng_viewer_session *send_session; |
d3e2ba59 | 839 | |
eea7556c MD |
840 | health_code_update(); |
841 | ||
d995f382 | 842 | pthread_mutex_lock(&session->lock); |
7e0a4379 JR |
843 | if (session->connection_closed) { |
844 | /* Skip closed session */ | |
d995f382 JG |
845 | goto next_session; |
846 | } | |
847 | if (!session->current_trace_chunk) { | |
848 | /* | |
849 | * Skip un-attachable session. It is either | |
850 | * being destroyed or has not had a trace | |
851 | * chunk created against it yet. | |
852 | */ | |
853 | goto next_session; | |
7e0a4379 JR |
854 | } |
855 | ||
7591bab1 MD |
856 | if (count >= buf_count) { |
857 | struct lttng_viewer_session *newbuf; | |
858 | uint32_t new_buf_count = buf_count << 1; | |
eea7556c | 859 | |
7591bab1 MD |
860 | newbuf = realloc(send_session_buf, |
861 | new_buf_count * sizeof(*send_session_buf)); | |
862 | if (!newbuf) { | |
863 | ret = -1; | |
d995f382 | 864 | goto break_loop; |
7591bab1 MD |
865 | } |
866 | send_session_buf = newbuf; | |
867 | buf_count = new_buf_count; | |
6763619c | 868 | } |
7591bab1 | 869 | send_session = &send_session_buf[count]; |
bfc3fb17 MD |
870 | if (lttng_strncpy(send_session->session_name, |
871 | session->session_name, | |
872 | sizeof(send_session->session_name))) { | |
873 | ret = -1; | |
d995f382 | 874 | goto break_loop; |
bfc3fb17 MD |
875 | } |
876 | if (lttng_strncpy(send_session->hostname, session->hostname, | |
877 | sizeof(send_session->hostname))) { | |
878 | ret = -1; | |
d995f382 | 879 | goto break_loop; |
bfc3fb17 | 880 | } |
7591bab1 MD |
881 | send_session->id = htobe64(session->id); |
882 | send_session->live_timer = htobe32(session->live_timer); | |
883 | if (session->viewer_attached) { | |
884 | send_session->clients = htobe32(1); | |
885 | } else { | |
886 | send_session->clients = htobe32(0); | |
d227d5bd | 887 | } |
7591bab1 MD |
888 | send_session->streams = htobe32(session->stream_count); |
889 | count++; | |
d995f382 JG |
890 | next_session: |
891 | pthread_mutex_unlock(&session->lock); | |
892 | continue; | |
893 | break_loop: | |
894 | pthread_mutex_unlock(&session->lock); | |
895 | break; | |
7591bab1 MD |
896 | } |
897 | rcu_read_unlock(); | |
5f10c6b1 JG |
898 | if (ret < 0) { |
899 | goto end_free; | |
900 | } | |
d227d5bd | 901 | |
7591bab1 | 902 | session_list.sessions_count = htobe32(count); |
d227d5bd | 903 | |
7591bab1 | 904 | health_code_update(); |
d227d5bd | 905 | |
7591bab1 MD |
906 | ret = send_response(conn->sock, &session_list, sizeof(session_list)); |
907 | if (ret < 0) { | |
908 | goto end_free; | |
d227d5bd | 909 | } |
d227d5bd | 910 | |
7591bab1 | 911 | health_code_update(); |
d227d5bd | 912 | |
7591bab1 MD |
913 | ret = send_response(conn->sock, send_session_buf, |
914 | count * sizeof(*send_session_buf)); | |
915 | if (ret < 0) { | |
916 | goto end_free; | |
d227d5bd | 917 | } |
7591bab1 | 918 | health_code_update(); |
d227d5bd | 919 | |
7591bab1 MD |
920 | ret = 0; |
921 | end_free: | |
922 | free(send_session_buf); | |
923 | return ret; | |
d227d5bd JD |
924 | } |
925 | ||
80e8027a | 926 | /* |
7591bab1 | 927 | * Send the viewer the list of current streams. |
80e8027a JD |
928 | */ |
929 | static | |
58eb9381 | 930 | int viewer_get_new_streams(struct relay_connection *conn) |
80e8027a JD |
931 | { |
932 | int ret, send_streams = 0; | |
7591bab1 | 933 | uint32_t nb_created = 0, nb_unsent = 0, nb_streams = 0, nb_total = 0; |
80e8027a JD |
934 | struct lttng_viewer_new_streams_request request; |
935 | struct lttng_viewer_new_streams_response response; | |
b66a15d1 | 936 | struct relay_session *session = NULL; |
6763619c | 937 | uint64_t session_id; |
bddf80e4 | 938 | bool closed = false; |
80e8027a | 939 | |
58eb9381 | 940 | assert(conn); |
80e8027a JD |
941 | |
942 | DBG("Get new streams received"); | |
943 | ||
80e8027a JD |
944 | health_code_update(); |
945 | ||
2f8f53af | 946 | /* Receive the request from the connected client. */ |
58eb9381 | 947 | ret = recv_request(conn->sock, &request, sizeof(request)); |
2f8f53af | 948 | if (ret < 0) { |
80e8027a JD |
949 | goto error; |
950 | } | |
6763619c | 951 | session_id = be64toh(request.session_id); |
80e8027a JD |
952 | |
953 | health_code_update(); | |
954 | ||
53efb85a MD |
955 | memset(&response, 0, sizeof(response)); |
956 | ||
7591bab1 | 957 | session = session_get_by_id(session_id); |
2f8f53af | 958 | if (!session) { |
6763619c | 959 | DBG("Relay session %" PRIu64 " not found", session_id); |
c4e361a4 | 960 | response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_ERR); |
80e8027a JD |
961 | goto send_reply; |
962 | } | |
963 | ||
7591bab1 | 964 | if (!viewer_session_is_attached(conn->viewer_session, session)) { |
c4e361a4 | 965 | response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_ERR); |
80e8027a JD |
966 | goto send_reply; |
967 | } | |
968 | ||
c06fdd95 | 969 | pthread_mutex_lock(&session->lock); |
b66a15d1 JG |
970 | ret = make_viewer_streams(session, |
971 | conn->viewer_session->current_trace_chunk, | |
972 | LTTNG_VIEWER_SEEK_LAST, &nb_total, &nb_unsent, | |
bddf80e4 | 973 | &nb_created, &closed); |
2f8f53af | 974 | if (ret < 0) { |
b66a15d1 | 975 | goto error_unlock_session; |
2f8f53af | 976 | } |
3d0bbd40 JG |
977 | send_streams = 1; |
978 | response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_OK); | |
b66a15d1 | 979 | |
2f8f53af DG |
980 | /* Only send back the newly created streams with the unsent ones. */ |
981 | nb_streams = nb_created + nb_unsent; | |
80e8027a JD |
982 | response.streams_count = htobe32(nb_streams); |
983 | ||
4479f682 | 984 | /* |
2229a09c MD |
985 | * If the session is closed, HUP when there are no more streams |
986 | * with data. | |
4479f682 | 987 | */ |
bddf80e4 | 988 | if (closed && nb_total == 0) { |
4479f682 | 989 | send_streams = 0; |
bddf80e4 | 990 | response.streams_count = 0; |
4479f682 | 991 | response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_HUP); |
3d0bbd40 | 992 | goto send_reply_unlock; |
4479f682 | 993 | } |
3d0bbd40 JG |
994 | send_reply_unlock: |
995 | pthread_mutex_unlock(&session->lock); | |
4479f682 | 996 | |
80e8027a JD |
997 | send_reply: |
998 | health_code_update(); | |
58eb9381 | 999 | ret = send_response(conn->sock, &response, sizeof(response)); |
80e8027a | 1000 | if (ret < 0) { |
7591bab1 | 1001 | goto end_put_session; |
80e8027a JD |
1002 | } |
1003 | health_code_update(); | |
1004 | ||
1005 | /* | |
7591bab1 MD |
1006 | * Unknown or empty session, just return gracefully, the viewer |
1007 | * knows what is happening. | |
80e8027a JD |
1008 | */ |
1009 | if (!send_streams || !nb_streams) { | |
1010 | ret = 0; | |
7591bab1 | 1011 | goto end_put_session; |
80e8027a JD |
1012 | } |
1013 | ||
2f8f53af | 1014 | /* |
7591bab1 MD |
1015 | * Send stream and *DON'T* ignore the sent flag so every viewer |
1016 | * streams that were not sent from that point will be sent to | |
1017 | * the viewer. | |
2f8f53af | 1018 | */ |
c06fdd95 | 1019 | ret = send_viewer_streams(conn->sock, session_id, 0); |
2f8f53af | 1020 | if (ret < 0) { |
7591bab1 | 1021 | goto end_put_session; |
80e8027a JD |
1022 | } |
1023 | ||
7591bab1 MD |
1024 | end_put_session: |
1025 | if (session) { | |
1026 | session_put(session); | |
1027 | } | |
80e8027a JD |
1028 | error: |
1029 | return ret; | |
b66a15d1 JG |
1030 | error_unlock_session: |
1031 | pthread_mutex_unlock(&session->lock); | |
1032 | session_put(session); | |
1033 | return ret; | |
80e8027a JD |
1034 | } |
1035 | ||
d3e2ba59 JD |
1036 | /* |
1037 | * Send the viewer the list of current sessions. | |
1038 | */ | |
1039 | static | |
58eb9381 | 1040 | int viewer_attach_session(struct relay_connection *conn) |
d3e2ba59 | 1041 | { |
2f8f53af DG |
1042 | int send_streams = 0; |
1043 | ssize_t ret; | |
80e8027a | 1044 | uint32_t nb_streams = 0; |
2f8f53af | 1045 | enum lttng_viewer_seek seek_type; |
d3e2ba59 JD |
1046 | struct lttng_viewer_attach_session_request request; |
1047 | struct lttng_viewer_attach_session_response response; | |
7591bab1 | 1048 | struct relay_session *session = NULL; |
dbd6665b | 1049 | enum lttng_viewer_attach_return_code viewer_attach_status; |
bddf80e4 | 1050 | bool closed = false; |
c06fdd95 | 1051 | uint64_t session_id; |
d3e2ba59 | 1052 | |
58eb9381 | 1053 | assert(conn); |
d3e2ba59 | 1054 | |
eea7556c MD |
1055 | health_code_update(); |
1056 | ||
2f8f53af | 1057 | /* Receive the request from the connected client. */ |
58eb9381 | 1058 | ret = recv_request(conn->sock, &request, sizeof(request)); |
2f8f53af | 1059 | if (ret < 0) { |
d3e2ba59 JD |
1060 | goto error; |
1061 | } | |
1062 | ||
c06fdd95 | 1063 | session_id = be64toh(request.session_id); |
eea7556c MD |
1064 | health_code_update(); |
1065 | ||
53efb85a MD |
1066 | memset(&response, 0, sizeof(response)); |
1067 | ||
c3b7390b JD |
1068 | if (!conn->viewer_session) { |
1069 | DBG("Client trying to attach before creating a live viewer session"); | |
1070 | response.status = htobe32(LTTNG_VIEWER_ATTACH_NO_SESSION); | |
1071 | goto send_reply; | |
1072 | } | |
1073 | ||
c06fdd95 | 1074 | session = session_get_by_id(session_id); |
2f8f53af | 1075 | if (!session) { |
c06fdd95 | 1076 | DBG("Relay session %" PRIu64 " not found", session_id); |
c4e361a4 | 1077 | response.status = htobe32(LTTNG_VIEWER_ATTACH_UNK); |
d3e2ba59 JD |
1078 | goto send_reply; |
1079 | } | |
c06fdd95 | 1080 | DBG("Attach session ID %" PRIu64 " received", session_id); |
d3e2ba59 | 1081 | |
c06fdd95 | 1082 | pthread_mutex_lock(&session->lock); |
79a42980 JG |
1083 | if (!session->current_trace_chunk) { |
1084 | /* | |
1085 | * Session is either being destroyed or it never had a trace | |
1086 | * chunk created against it. | |
1087 | */ | |
1088 | DBG("Session requested by live client has no current trace chunk, returning unknown session"); | |
1089 | response.status = htobe32(LTTNG_VIEWER_ATTACH_UNK); | |
1090 | goto send_reply; | |
1091 | } | |
7591bab1 | 1092 | if (session->live_timer == 0) { |
d3e2ba59 | 1093 | DBG("Not live session"); |
c4e361a4 | 1094 | response.status = htobe32(LTTNG_VIEWER_ATTACH_NOT_LIVE); |
d3e2ba59 | 1095 | goto send_reply; |
7591bab1 MD |
1096 | } |
1097 | ||
1098 | send_streams = 1; | |
dbd6665b JG |
1099 | viewer_attach_status = viewer_session_attach(conn->viewer_session, |
1100 | session); | |
1101 | if (viewer_attach_status != LTTNG_VIEWER_ATTACH_OK) { | |
1102 | response.status = htobe32(viewer_attach_status); | |
7591bab1 | 1103 | goto send_reply; |
d3e2ba59 JD |
1104 | } |
1105 | ||
1106 | switch (be32toh(request.seek)) { | |
c4e361a4 JD |
1107 | case LTTNG_VIEWER_SEEK_BEGINNING: |
1108 | case LTTNG_VIEWER_SEEK_LAST: | |
7591bab1 | 1109 | response.status = htobe32(LTTNG_VIEWER_ATTACH_OK); |
2f8f53af | 1110 | seek_type = be32toh(request.seek); |
d3e2ba59 JD |
1111 | break; |
1112 | default: | |
1113 | ERR("Wrong seek parameter"); | |
c4e361a4 | 1114 | response.status = htobe32(LTTNG_VIEWER_ATTACH_SEEK_ERR); |
d3e2ba59 JD |
1115 | send_streams = 0; |
1116 | goto send_reply; | |
1117 | } | |
1118 | ||
b66a15d1 JG |
1119 | ret = make_viewer_streams(session, |
1120 | conn->viewer_session->current_trace_chunk, seek_type, | |
1121 | &nb_streams, NULL, NULL, &closed); | |
2f8f53af | 1122 | if (ret < 0) { |
7591bab1 | 1123 | goto end_put_session; |
d3e2ba59 | 1124 | } |
c06fdd95 JG |
1125 | pthread_mutex_unlock(&session->lock); |
1126 | session_put(session); | |
1127 | session = NULL; | |
1128 | ||
1129 | response.streams_count = htobe32(nb_streams); | |
bddf80e4 MD |
1130 | /* |
1131 | * If the session is closed when the viewer is attaching, it | |
1132 | * means some of the streams may have been concurrently removed, | |
1133 | * so we don't allow the viewer to attach, even if there are | |
1134 | * streams available. | |
1135 | */ | |
1136 | if (closed) { | |
1137 | send_streams = 0; | |
1138 | response.streams_count = 0; | |
06079f15 | 1139 | response.status = htobe32(LTTNG_VIEWER_ATTACH_UNK); |
bddf80e4 MD |
1140 | goto send_reply; |
1141 | } | |
1142 | ||
d3e2ba59 | 1143 | send_reply: |
eea7556c | 1144 | health_code_update(); |
58eb9381 | 1145 | ret = send_response(conn->sock, &response, sizeof(response)); |
d3e2ba59 | 1146 | if (ret < 0) { |
7591bab1 | 1147 | goto end_put_session; |
d3e2ba59 | 1148 | } |
eea7556c | 1149 | health_code_update(); |
d3e2ba59 JD |
1150 | |
1151 | /* | |
7591bab1 MD |
1152 | * Unknown or empty session, just return gracefully, the viewer |
1153 | * knows what is happening. | |
d3e2ba59 | 1154 | */ |
157df586 | 1155 | if (!send_streams || !nb_streams) { |
d3e2ba59 | 1156 | ret = 0; |
7591bab1 | 1157 | goto end_put_session; |
d3e2ba59 JD |
1158 | } |
1159 | ||
2f8f53af | 1160 | /* Send stream and ignore the sent flag. */ |
c06fdd95 | 1161 | ret = send_viewer_streams(conn->sock, session_id, 1); |
2f8f53af | 1162 | if (ret < 0) { |
7591bab1 | 1163 | goto end_put_session; |
d3e2ba59 | 1164 | } |
d3e2ba59 | 1165 | |
7591bab1 MD |
1166 | end_put_session: |
1167 | if (session) { | |
c06fdd95 | 1168 | pthread_mutex_unlock(&session->lock); |
7591bab1 MD |
1169 | session_put(session); |
1170 | } | |
4a9daf17 JD |
1171 | error: |
1172 | return ret; | |
1173 | } | |
1174 | ||
878c34cf DG |
1175 | /* |
1176 | * Open the index file if needed for the given vstream. | |
1177 | * | |
f8f3885c MD |
1178 | * If an index file is successfully opened, the vstream will set it as its |
1179 | * current index file. | |
878c34cf DG |
1180 | * |
1181 | * Return 0 on success, a negative value on error (-ENOENT if not ready yet). | |
7591bab1 MD |
1182 | * |
1183 | * Called with rstream lock held. | |
878c34cf DG |
1184 | */ |
1185 | static int try_open_index(struct relay_viewer_stream *vstream, | |
1186 | struct relay_stream *rstream) | |
1187 | { | |
1188 | int ret = 0; | |
ebb29c10 JG |
1189 | const uint32_t connection_major = rstream->trace->session->major; |
1190 | const uint32_t connection_minor = rstream->trace->session->minor; | |
878c34cf | 1191 | |
f8f3885c | 1192 | if (vstream->index_file) { |
878c34cf DG |
1193 | goto end; |
1194 | } | |
1195 | ||
1196 | /* | |
7591bab1 | 1197 | * First time, we open the index file and at least one index is ready. |
878c34cf | 1198 | */ |
a44ca2ca | 1199 | if (rstream->index_received_seqcount == 0) { |
878c34cf DG |
1200 | ret = -ENOENT; |
1201 | goto end; | |
1202 | } | |
ebb29c10 | 1203 | vstream->index_file = lttng_index_file_create_from_trace_chunk_read_only( |
b66a15d1 | 1204 | vstream->stream_file.trace_chunk, rstream->path_name, |
ebb29c10 JG |
1205 | rstream->channel_name, rstream->tracefile_size, |
1206 | vstream->current_tracefile_id, | |
1207 | lttng_to_index_major(connection_major, connection_minor), | |
1208 | lttng_to_index_minor(connection_major, connection_minor)); | |
f8f3885c MD |
1209 | if (!vstream->index_file) { |
1210 | ret = -1; | |
878c34cf DG |
1211 | } |
1212 | ||
1213 | end: | |
1214 | return ret; | |
1215 | } | |
1216 | ||
1217 | /* | |
7591bab1 MD |
1218 | * Check the status of the index for the given stream. This function |
1219 | * updates the index structure if needed and can put (close) the vstream | |
1220 | * in the HUP situation. | |
1221 | * | |
1222 | * Return 0 means that we can proceed with the index. A value of 1 means | |
1223 | * that the index has been updated and is ready to be sent to the | |
1224 | * client. A negative value indicates an error that can't be handled. | |
878c34cf | 1225 | * |
7591bab1 | 1226 | * Called with rstream lock held. |
878c34cf DG |
1227 | */ |
1228 | static int check_index_status(struct relay_viewer_stream *vstream, | |
1229 | struct relay_stream *rstream, struct ctf_trace *trace, | |
1230 | struct lttng_viewer_index *index) | |
1231 | { | |
1232 | int ret; | |
1233 | ||
797bc362 | 1234 | if ((trace->session->connection_closed || rstream->closed) |
a44ca2ca MD |
1235 | && rstream->index_received_seqcount |
1236 | == vstream->index_sent_seqcount) { | |
797bc362 MD |
1237 | /* |
1238 | * Last index sent and session connection or relay | |
1239 | * stream are closed. | |
1240 | */ | |
7591bab1 MD |
1241 | index->status = htobe32(LTTNG_VIEWER_INDEX_HUP); |
1242 | goto hup; | |
1243 | } else if (rstream->beacon_ts_end != -1ULL && | |
a44ca2ca MD |
1244 | rstream->index_received_seqcount |
1245 | == vstream->index_sent_seqcount) { | |
7591bab1 MD |
1246 | /* |
1247 | * We've received a synchronization beacon and the last index | |
1248 | * available has been sent, the index for now is inactive. | |
1249 | * | |
1250 | * In this case, we have received a beacon which allows us to | |
1251 | * inform the client of a time interval during which we can | |
1252 | * guarantee that there are no events to read (and never will | |
1253 | * be). | |
1254 | */ | |
1255 | index->status = htobe32(LTTNG_VIEWER_INDEX_INACTIVE); | |
1256 | index->timestamp_end = htobe64(rstream->beacon_ts_end); | |
1257 | index->stream_id = htobe64(rstream->ctf_stream_id); | |
1258 | goto index_ready; | |
a44ca2ca MD |
1259 | } else if (rstream->index_received_seqcount |
1260 | == vstream->index_sent_seqcount) { | |
7591bab1 | 1261 | /* |
a44ca2ca MD |
1262 | * This checks whether received == sent seqcount. In |
1263 | * this case, we have not received a beacon. Therefore, | |
1264 | * we can only ask the client to retry later. | |
7591bab1 MD |
1265 | */ |
1266 | index->status = htobe32(LTTNG_VIEWER_INDEX_RETRY); | |
1267 | goto index_ready; | |
a44ca2ca MD |
1268 | } else if (!tracefile_array_seq_in_file(rstream->tfa, |
1269 | vstream->current_tracefile_id, | |
1270 | vstream->index_sent_seqcount)) { | |
7591bab1 | 1271 | /* |
a44ca2ca MD |
1272 | * The next index we want to send cannot be read either |
1273 | * because we need to perform a rotation, or due to | |
1274 | * the producer having overwritten its trace file. | |
7591bab1 | 1275 | */ |
a44ca2ca | 1276 | DBG("Viewer stream %" PRIu64 " rotation", |
7591bab1 MD |
1277 | vstream->stream->stream_handle); |
1278 | ret = viewer_stream_rotate(vstream); | |
1279 | if (ret < 0) { | |
1280 | goto end; | |
1281 | } else if (ret == 1) { | |
1282 | /* EOF across entire stream. */ | |
1283 | index->status = htobe32(LTTNG_VIEWER_INDEX_HUP); | |
1284 | goto hup; | |
1285 | } | |
7591bab1 | 1286 | /* |
a44ca2ca MD |
1287 | * If we have been pushed due to overwrite, it |
1288 | * necessarily means there is data that can be read in | |
1289 | * the stream. If we rotated because we reached the end | |
1290 | * of a tracefile, it means the following tracefile | |
1291 | * needs to contain at least one index, else we would | |
1292 | * have already returned LTTNG_VIEWER_INDEX_RETRY to the | |
1293 | * viewer. The updated index_sent_seqcount needs to | |
1294 | * point to a readable index entry now. | |
1295 | * | |
1296 | * In the case where we "rotate" on a single file, we | |
1297 | * can end up in a case where the requested index is | |
1298 | * still unavailable. | |
7591bab1 | 1299 | */ |
a44ca2ca MD |
1300 | if (rstream->tracefile_count == 1 && |
1301 | !tracefile_array_seq_in_file( | |
1302 | rstream->tfa, | |
1303 | vstream->current_tracefile_id, | |
1304 | vstream->index_sent_seqcount)) { | |
1305 | index->status = htobe32(LTTNG_VIEWER_INDEX_RETRY); | |
1306 | goto index_ready; | |
878c34cf | 1307 | } |
a44ca2ca MD |
1308 | assert(tracefile_array_seq_in_file(rstream->tfa, |
1309 | vstream->current_tracefile_id, | |
1310 | vstream->index_sent_seqcount)); | |
878c34cf | 1311 | } |
a44ca2ca MD |
1312 | /* ret == 0 means successful so we continue. */ |
1313 | ret = 0; | |
7591bab1 | 1314 | end: |
878c34cf DG |
1315 | return ret; |
1316 | ||
1317 | hup: | |
7591bab1 | 1318 | viewer_stream_put(vstream); |
878c34cf DG |
1319 | index_ready: |
1320 | return 1; | |
1321 | } | |
1322 | ||
d3e2ba59 JD |
1323 | /* |
1324 | * Send the next index for a stream. | |
1325 | * | |
1326 | * Return 0 on success or else a negative value. | |
1327 | */ | |
1328 | static | |
58eb9381 | 1329 | int viewer_get_next_index(struct relay_connection *conn) |
d3e2ba59 JD |
1330 | { |
1331 | int ret; | |
1332 | struct lttng_viewer_get_next_index request_index; | |
1333 | struct lttng_viewer_index viewer_index; | |
50adc264 | 1334 | struct ctf_packet_index packet_index; |
7591bab1 MD |
1335 | struct relay_viewer_stream *vstream = NULL; |
1336 | struct relay_stream *rstream = NULL; | |
1337 | struct ctf_trace *ctf_trace = NULL; | |
1338 | struct relay_viewer_stream *metadata_viewer_stream = NULL; | |
d3e2ba59 | 1339 | |
58eb9381 | 1340 | assert(conn); |
d3e2ba59 JD |
1341 | |
1342 | DBG("Viewer get next index"); | |
1343 | ||
7591bab1 | 1344 | memset(&viewer_index, 0, sizeof(viewer_index)); |
eea7556c | 1345 | health_code_update(); |
2f8f53af | 1346 | |
58eb9381 | 1347 | ret = recv_request(conn->sock, &request_index, sizeof(request_index)); |
2f8f53af | 1348 | if (ret < 0) { |
d3e2ba59 JD |
1349 | goto end; |
1350 | } | |
eea7556c | 1351 | health_code_update(); |
d3e2ba59 | 1352 | |
7591bab1 | 1353 | vstream = viewer_stream_get_by_id(be64toh(request_index.stream_id)); |
6763619c | 1354 | if (!vstream) { |
a44ca2ca | 1355 | DBG("Client requested index of unknown stream id %" PRIu64, |
9b9f9f94 | 1356 | (uint64_t) be64toh(request_index.stream_id)); |
f1883937 MD |
1357 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR); |
1358 | goto send_reply; | |
2a174661 DG |
1359 | } |
1360 | ||
7591bab1 MD |
1361 | /* Use back. ref. Protected by refcounts. */ |
1362 | rstream = vstream->stream; | |
1363 | ctf_trace = rstream->trace; | |
d3e2ba59 | 1364 | |
7591bab1 MD |
1365 | /* metadata_viewer_stream may be NULL. */ |
1366 | metadata_viewer_stream = | |
1367 | ctf_trace_get_viewer_metadata_stream(ctf_trace); | |
2a174661 | 1368 | |
7591bab1 | 1369 | pthread_mutex_lock(&rstream->lock); |
d3e2ba59 JD |
1370 | |
1371 | /* | |
1372 | * The viewer should not ask for index on metadata stream. | |
1373 | */ | |
7591bab1 | 1374 | if (rstream->is_metadata) { |
c4e361a4 | 1375 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_HUP); |
d3e2ba59 JD |
1376 | goto send_reply; |
1377 | } | |
1378 | ||
878c34cf DG |
1379 | /* Try to open an index if one is needed for that stream. */ |
1380 | ret = try_open_index(vstream, rstream); | |
1381 | if (ret < 0) { | |
0e6830aa | 1382 | if (ret == -ENOENT) { |
d3e2ba59 | 1383 | /* |
7591bab1 MD |
1384 | * The index is created only when the first data |
1385 | * packet arrives, it might not be ready at the | |
1386 | * beginning of the session | |
d3e2ba59 | 1387 | */ |
c4e361a4 | 1388 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_RETRY); |
878c34cf DG |
1389 | } else { |
1390 | /* Unhandled error. */ | |
c4e361a4 | 1391 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR); |
d3e2ba59 | 1392 | } |
878c34cf | 1393 | goto send_reply; |
d3e2ba59 JD |
1394 | } |
1395 | ||
878c34cf | 1396 | ret = check_index_status(vstream, rstream, ctf_trace, &viewer_index); |
878c34cf | 1397 | if (ret < 0) { |
7591bab1 | 1398 | goto error_put; |
878c34cf DG |
1399 | } else if (ret == 1) { |
1400 | /* | |
7591bab1 MD |
1401 | * We have no index to send and check_index_status has populated |
1402 | * viewer_index's status. | |
878c34cf | 1403 | */ |
d3e2ba59 JD |
1404 | goto send_reply; |
1405 | } | |
7591bab1 | 1406 | /* At this point, ret is 0 thus we will be able to read the index. */ |
878c34cf | 1407 | assert(!ret); |
d3e2ba59 | 1408 | |
7591bab1 MD |
1409 | /* |
1410 | * vstream->stream_fd may be NULL if it has been closed by | |
1411 | * tracefile rotation, or if we are at the beginning of the | |
1412 | * stream. We open the data stream file here to protect against | |
1413 | * overwrite caused by tracefile rotation (in association with | |
1414 | * unlink performed before overwrite). | |
1415 | */ | |
ebb29c10 JG |
1416 | if (!vstream->stream_file.fd) { |
1417 | int fd; | |
1418 | char file_path[LTTNG_PATH_MAX]; | |
1419 | enum lttng_trace_chunk_status status; | |
1420 | ||
1421 | ret = utils_stream_file_path(rstream->path_name, | |
1422 | rstream->channel_name, rstream->tracefile_size, | |
1423 | vstream->current_tracefile_id, NULL, file_path, | |
1424 | sizeof(file_path)); | |
7591bab1 MD |
1425 | if (ret < 0) { |
1426 | goto error_put; | |
1427 | } | |
ebb29c10 JG |
1428 | |
1429 | status = lttng_trace_chunk_open_file( | |
1430 | vstream->stream_file.trace_chunk, | |
1431 | file_path, O_RDONLY, 0, &fd); | |
1432 | if (status != LTTNG_TRACE_CHUNK_STATUS_OK) { | |
1433 | PERROR("Failed to open trace file for viewer stream"); | |
7591bab1 MD |
1434 | goto error_put; |
1435 | } | |
ebb29c10 JG |
1436 | vstream->stream_file.fd = stream_fd_create(fd); |
1437 | if (!vstream->stream_file.fd) { | |
1438 | if (close(fd)) { | |
1439 | PERROR("Failed to close viewer stream file"); | |
7591bab1 MD |
1440 | } |
1441 | goto error_put; | |
1442 | } | |
d3e2ba59 JD |
1443 | } |
1444 | ||
f04a971b | 1445 | ret = check_new_streams(conn); |
4a9daf17 | 1446 | if (ret < 0) { |
7591bab1 MD |
1447 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR); |
1448 | goto send_reply; | |
4a9daf17 JD |
1449 | } else if (ret == 1) { |
1450 | viewer_index.flags |= LTTNG_VIEWER_FLAG_NEW_STREAM; | |
1451 | } | |
1452 | ||
f8f3885c MD |
1453 | ret = lttng_index_file_read(vstream->index_file, &packet_index); |
1454 | if (ret) { | |
1455 | ERR("Relay error reading index file %d", | |
1456 | vstream->index_file->fd); | |
7591bab1 | 1457 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR); |
6b6b9a5a | 1458 | goto send_reply; |
d3e2ba59 | 1459 | } else { |
c4e361a4 | 1460 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_OK); |
a44ca2ca | 1461 | vstream->index_sent_seqcount++; |
d3e2ba59 JD |
1462 | } |
1463 | ||
1464 | /* | |
1465 | * Indexes are stored in big endian, no need to switch before sending. | |
1466 | */ | |
7591bab1 MD |
1467 | DBG("Sending viewer index for stream %" PRIu64 " offset %" PRIu64, |
1468 | rstream->stream_handle, | |
9b9f9f94 | 1469 | (uint64_t) be64toh(packet_index.offset)); |
d3e2ba59 JD |
1470 | viewer_index.offset = packet_index.offset; |
1471 | viewer_index.packet_size = packet_index.packet_size; | |
1472 | viewer_index.content_size = packet_index.content_size; | |
1473 | viewer_index.timestamp_begin = packet_index.timestamp_begin; | |
1474 | viewer_index.timestamp_end = packet_index.timestamp_end; | |
1475 | viewer_index.events_discarded = packet_index.events_discarded; | |
1476 | viewer_index.stream_id = packet_index.stream_id; | |
1477 | ||
1478 | send_reply: | |
f1883937 MD |
1479 | if (rstream) { |
1480 | pthread_mutex_unlock(&rstream->lock); | |
1481 | } | |
7591bab1 MD |
1482 | |
1483 | if (metadata_viewer_stream) { | |
1484 | pthread_mutex_lock(&metadata_viewer_stream->stream->lock); | |
1485 | DBG("get next index metadata check: recv %" PRIu64 | |
1486 | " sent %" PRIu64, | |
1487 | metadata_viewer_stream->stream->metadata_received, | |
1488 | metadata_viewer_stream->metadata_sent); | |
1489 | if (!metadata_viewer_stream->stream->metadata_received || | |
1490 | metadata_viewer_stream->stream->metadata_received > | |
1491 | metadata_viewer_stream->metadata_sent) { | |
1492 | viewer_index.flags |= LTTNG_VIEWER_FLAG_NEW_METADATA; | |
1493 | } | |
1494 | pthread_mutex_unlock(&metadata_viewer_stream->stream->lock); | |
1495 | } | |
1496 | ||
d3e2ba59 | 1497 | viewer_index.flags = htobe32(viewer_index.flags); |
eea7556c | 1498 | health_code_update(); |
2f8f53af | 1499 | |
58eb9381 | 1500 | ret = send_response(conn->sock, &viewer_index, sizeof(viewer_index)); |
d3e2ba59 | 1501 | if (ret < 0) { |
7591bab1 | 1502 | goto end; |
d3e2ba59 | 1503 | } |
eea7556c | 1504 | health_code_update(); |
d3e2ba59 | 1505 | |
9237e6a1 MD |
1506 | if (vstream) { |
1507 | DBG("Index %" PRIu64 " for stream %" PRIu64 " sent", | |
a44ca2ca | 1508 | vstream->index_sent_seqcount, |
9237e6a1 MD |
1509 | vstream->stream->stream_handle); |
1510 | } | |
d3e2ba59 | 1511 | end: |
7591bab1 MD |
1512 | if (metadata_viewer_stream) { |
1513 | viewer_stream_put(metadata_viewer_stream); | |
1514 | } | |
1515 | if (vstream) { | |
1516 | viewer_stream_put(vstream); | |
1517 | } | |
1518 | return ret; | |
1519 | ||
1520 | error_put: | |
1521 | pthread_mutex_unlock(&rstream->lock); | |
1522 | if (metadata_viewer_stream) { | |
1523 | viewer_stream_put(metadata_viewer_stream); | |
1524 | } | |
1525 | viewer_stream_put(vstream); | |
d3e2ba59 JD |
1526 | return ret; |
1527 | } | |
1528 | ||
1529 | /* | |
1530 | * Send the next index for a stream | |
1531 | * | |
1532 | * Return 0 on success or else a negative value. | |
1533 | */ | |
1534 | static | |
58eb9381 | 1535 | int viewer_get_packet(struct relay_connection *conn) |
d3e2ba59 | 1536 | { |
b6025e94 | 1537 | int ret; |
a5df8828 | 1538 | off_t lseek_ret; |
553b2adb | 1539 | char *reply = NULL; |
d3e2ba59 | 1540 | struct lttng_viewer_get_packet get_packet_info; |
553b2adb | 1541 | struct lttng_viewer_trace_packet reply_header; |
7591bab1 | 1542 | struct relay_viewer_stream *vstream = NULL; |
553b2adb | 1543 | uint32_t reply_size = sizeof(reply_header); |
b6025e94 JR |
1544 | uint32_t packet_data_len = 0; |
1545 | ssize_t read_len; | |
d3e2ba59 JD |
1546 | |
1547 | DBG2("Relay get data packet"); | |
1548 | ||
eea7556c | 1549 | health_code_update(); |
2f8f53af | 1550 | |
7591bab1 MD |
1551 | ret = recv_request(conn->sock, &get_packet_info, |
1552 | sizeof(get_packet_info)); | |
2f8f53af | 1553 | if (ret < 0) { |
d3e2ba59 JD |
1554 | goto end; |
1555 | } | |
eea7556c | 1556 | health_code_update(); |
d3e2ba59 | 1557 | |
0233a6a5 | 1558 | /* From this point on, the error label can be reached. */ |
553b2adb | 1559 | memset(&reply_header, 0, sizeof(reply_header)); |
0233a6a5 | 1560 | |
7591bab1 MD |
1561 | vstream = viewer_stream_get_by_id(be64toh(get_packet_info.stream_id)); |
1562 | if (!vstream) { | |
a44ca2ca | 1563 | DBG("Client requested packet of unknown stream id %" PRIu64, |
9b9f9f94 | 1564 | (uint64_t) be64toh(get_packet_info.stream_id)); |
553b2adb JG |
1565 | reply_header.status = htobe32(LTTNG_VIEWER_GET_PACKET_ERR); |
1566 | goto send_reply_nolock; | |
b6025e94 JR |
1567 | } else { |
1568 | packet_data_len = be32toh(get_packet_info.len); | |
553b2adb | 1569 | reply_size += packet_data_len; |
d3e2ba59 | 1570 | } |
2a174661 | 1571 | |
553b2adb JG |
1572 | reply = zmalloc(reply_size); |
1573 | if (!reply) { | |
1574 | PERROR("packet reply zmalloc"); | |
1575 | reply_size = sizeof(reply_header); | |
d3e2ba59 JD |
1576 | goto error; |
1577 | } | |
1578 | ||
b6025e94 | 1579 | pthread_mutex_lock(&vstream->stream->lock); |
ebb29c10 JG |
1580 | lseek_ret = lseek(vstream->stream_file.fd->fd, |
1581 | be64toh(get_packet_info.offset), SEEK_SET); | |
a5df8828 | 1582 | if (lseek_ret < 0) { |
ebb29c10 JG |
1583 | PERROR("lseek fd %d to offset %" PRIu64, |
1584 | vstream->stream_file.fd->fd, | |
1585 | (uint64_t) be64toh(get_packet_info.offset)); | |
7591bab1 | 1586 | goto error; |
d3e2ba59 | 1587 | } |
ebb29c10 JG |
1588 | read_len = lttng_read(vstream->stream_file.fd->fd, |
1589 | reply + sizeof(reply_header), packet_data_len); | |
b6025e94 | 1590 | if (read_len < packet_data_len) { |
7591bab1 | 1591 | PERROR("Relay reading trace file, fd: %d, offset: %" PRIu64, |
ebb29c10 | 1592 | vstream->stream_file.fd->fd, |
9b9f9f94 | 1593 | (uint64_t) be64toh(get_packet_info.offset)); |
7591bab1 | 1594 | goto error; |
d3e2ba59 | 1595 | } |
553b2adb JG |
1596 | reply_header.status = htobe32(LTTNG_VIEWER_GET_PACKET_OK); |
1597 | reply_header.len = htobe32(packet_data_len); | |
d3e2ba59 JD |
1598 | goto send_reply; |
1599 | ||
1600 | error: | |
553b2adb | 1601 | reply_header.status = htobe32(LTTNG_VIEWER_GET_PACKET_ERR); |
d3e2ba59 JD |
1602 | |
1603 | send_reply: | |
7591bab1 MD |
1604 | if (vstream) { |
1605 | pthread_mutex_unlock(&vstream->stream->lock); | |
1606 | } | |
1607 | send_reply_nolock: | |
eea7556c MD |
1608 | |
1609 | health_code_update(); | |
2f8f53af | 1610 | |
553b2adb JG |
1611 | if (reply) { |
1612 | memcpy(reply, &reply_header, sizeof(reply_header)); | |
1613 | ret = send_response(conn->sock, reply, reply_size); | |
1614 | } else { | |
1615 | /* No reply to send. */ | |
1616 | ret = send_response(conn->sock, &reply_header, | |
1617 | reply_size); | |
1618 | } | |
1619 | ||
b6025e94 | 1620 | health_code_update(); |
d3e2ba59 | 1621 | if (ret < 0) { |
b6025e94 | 1622 | PERROR("sendmsg of packet data failed"); |
7591bab1 | 1623 | goto end_free; |
d3e2ba59 | 1624 | } |
d3e2ba59 | 1625 | |
553b2adb | 1626 | DBG("Sent %u bytes for stream %" PRIu64, reply_size, |
9b9f9f94 | 1627 | (uint64_t) be64toh(get_packet_info.stream_id)); |
d3e2ba59 | 1628 | |
7591bab1 | 1629 | end_free: |
553b2adb | 1630 | free(reply); |
d3e2ba59 | 1631 | end: |
7591bab1 MD |
1632 | if (vstream) { |
1633 | viewer_stream_put(vstream); | |
1634 | } | |
d3e2ba59 JD |
1635 | return ret; |
1636 | } | |
1637 | ||
1638 | /* | |
1639 | * Send the session's metadata | |
1640 | * | |
1641 | * Return 0 on success else a negative value. | |
1642 | */ | |
1643 | static | |
58eb9381 | 1644 | int viewer_get_metadata(struct relay_connection *conn) |
d3e2ba59 JD |
1645 | { |
1646 | int ret = 0; | |
1647 | ssize_t read_len; | |
1648 | uint64_t len = 0; | |
1649 | char *data = NULL; | |
1650 | struct lttng_viewer_get_metadata request; | |
1651 | struct lttng_viewer_metadata_packet reply; | |
7591bab1 | 1652 | struct relay_viewer_stream *vstream = NULL; |
d3e2ba59 | 1653 | |
58eb9381 | 1654 | assert(conn); |
d3e2ba59 JD |
1655 | |
1656 | DBG("Relay get metadata"); | |
1657 | ||
eea7556c | 1658 | health_code_update(); |
2f8f53af | 1659 | |
58eb9381 | 1660 | ret = recv_request(conn->sock, &request, sizeof(request)); |
2f8f53af | 1661 | if (ret < 0) { |
d3e2ba59 JD |
1662 | goto end; |
1663 | } | |
eea7556c | 1664 | health_code_update(); |
d3e2ba59 | 1665 | |
53efb85a MD |
1666 | memset(&reply, 0, sizeof(reply)); |
1667 | ||
7591bab1 MD |
1668 | vstream = viewer_stream_get_by_id(be64toh(request.stream_id)); |
1669 | if (!vstream) { | |
3b463131 MD |
1670 | /* |
1671 | * The metadata stream can be closed by a CLOSE command | |
1672 | * just before we attach. It can also be closed by | |
1673 | * per-pid tracing during tracing. Therefore, it is | |
1674 | * possible that we cannot find this viewer stream. | |
1675 | * Reply back to the client with an error if we cannot | |
1676 | * find it. | |
1677 | */ | |
a44ca2ca | 1678 | DBG("Client requested metadata of unknown stream id %" PRIu64, |
9b9f9f94 | 1679 | (uint64_t) be64toh(request.stream_id)); |
3b463131 | 1680 | reply.status = htobe32(LTTNG_VIEWER_METADATA_ERR); |
7591bab1 | 1681 | goto send_reply; |
d3e2ba59 | 1682 | } |
7591bab1 MD |
1683 | pthread_mutex_lock(&vstream->stream->lock); |
1684 | if (!vstream->stream->is_metadata) { | |
1685 | ERR("Invalid metadata stream"); | |
6763619c JD |
1686 | goto error; |
1687 | } | |
1688 | ||
7591bab1 | 1689 | assert(vstream->metadata_sent <= vstream->stream->metadata_received); |
2a174661 | 1690 | |
7591bab1 | 1691 | len = vstream->stream->metadata_received - vstream->metadata_sent; |
d3e2ba59 | 1692 | if (len == 0) { |
c4e361a4 | 1693 | reply.status = htobe32(LTTNG_VIEWER_NO_NEW_METADATA); |
d3e2ba59 JD |
1694 | goto send_reply; |
1695 | } | |
1696 | ||
1697 | /* first time, we open the metadata file */ | |
ebb29c10 JG |
1698 | if (!vstream->stream_file.fd) { |
1699 | int fd; | |
1700 | char file_path[LTTNG_PATH_MAX]; | |
1701 | enum lttng_trace_chunk_status status; | |
1702 | struct relay_stream *rstream = vstream->stream; | |
1703 | ||
1704 | ret = utils_stream_file_path(rstream->path_name, | |
1705 | rstream->channel_name, rstream->tracefile_size, | |
1706 | vstream->current_tracefile_id, NULL, file_path, | |
1707 | sizeof(file_path)); | |
d3e2ba59 JD |
1708 | if (ret < 0) { |
1709 | goto error; | |
1710 | } | |
ebb29c10 JG |
1711 | |
1712 | status = lttng_trace_chunk_open_file( | |
1713 | vstream->stream_file.trace_chunk, | |
1714 | file_path, O_RDONLY, 0, &fd); | |
1715 | if (status != LTTNG_TRACE_CHUNK_STATUS_OK) { | |
1716 | PERROR("Failed to open metadata file for viewer stream"); | |
d3e2ba59 JD |
1717 | goto error; |
1718 | } | |
ebb29c10 JG |
1719 | vstream->stream_file.fd = stream_fd_create(fd); |
1720 | if (!vstream->stream_file.fd) { | |
1721 | if (close(fd)) { | |
1722 | PERROR("Failed to close viewer metadata file"); | |
7591bab1 MD |
1723 | } |
1724 | goto error; | |
1725 | } | |
d3e2ba59 JD |
1726 | } |
1727 | ||
1728 | reply.len = htobe64(len); | |
1729 | data = zmalloc(len); | |
1730 | if (!data) { | |
1731 | PERROR("viewer metadata zmalloc"); | |
1732 | goto error; | |
1733 | } | |
1734 | ||
ebb29c10 | 1735 | read_len = lttng_read(vstream->stream_file.fd->fd, data, len); |
6cd525e8 | 1736 | if (read_len < len) { |
d3e2ba59 JD |
1737 | PERROR("Relay reading metadata file"); |
1738 | goto error; | |
1739 | } | |
7591bab1 MD |
1740 | vstream->metadata_sent += read_len; |
1741 | if (vstream->metadata_sent == vstream->stream->metadata_received | |
1742 | && vstream->stream->closed) { | |
1743 | /* Release ownership for the viewer metadata stream. */ | |
1744 | viewer_stream_put(vstream); | |
1745 | } | |
1746 | ||
c4e361a4 | 1747 | reply.status = htobe32(LTTNG_VIEWER_METADATA_OK); |
7591bab1 | 1748 | |
d3e2ba59 JD |
1749 | goto send_reply; |
1750 | ||
1751 | error: | |
c4e361a4 | 1752 | reply.status = htobe32(LTTNG_VIEWER_METADATA_ERR); |
d3e2ba59 JD |
1753 | |
1754 | send_reply: | |
eea7556c | 1755 | health_code_update(); |
7591bab1 MD |
1756 | if (vstream) { |
1757 | pthread_mutex_unlock(&vstream->stream->lock); | |
1758 | } | |
58eb9381 | 1759 | ret = send_response(conn->sock, &reply, sizeof(reply)); |
d3e2ba59 | 1760 | if (ret < 0) { |
7591bab1 | 1761 | goto end_free; |
d3e2ba59 | 1762 | } |
eea7556c | 1763 | health_code_update(); |
d3e2ba59 JD |
1764 | |
1765 | if (len > 0) { | |
58eb9381 | 1766 | ret = send_response(conn->sock, data, len); |
d3e2ba59 | 1767 | if (ret < 0) { |
7591bab1 | 1768 | goto end_free; |
d3e2ba59 JD |
1769 | } |
1770 | } | |
1771 | ||
1772 | DBG("Sent %" PRIu64 " bytes of metadata for stream %" PRIu64, len, | |
9b9f9f94 | 1773 | (uint64_t) be64toh(request.stream_id)); |
d3e2ba59 JD |
1774 | |
1775 | DBG("Metadata sent"); | |
1776 | ||
7591bab1 | 1777 | end_free: |
d3e2ba59 | 1778 | free(data); |
d3e2ba59 | 1779 | end: |
7591bab1 MD |
1780 | if (vstream) { |
1781 | viewer_stream_put(vstream); | |
1782 | } | |
d3e2ba59 JD |
1783 | return ret; |
1784 | } | |
1785 | ||
c3b7390b JD |
1786 | /* |
1787 | * Create a viewer session. | |
1788 | * | |
1789 | * Return 0 on success or else a negative value. | |
1790 | */ | |
1791 | static | |
1792 | int viewer_create_session(struct relay_connection *conn) | |
1793 | { | |
1794 | int ret; | |
1795 | struct lttng_viewer_create_session_response resp; | |
1796 | ||
1797 | DBG("Viewer create session received"); | |
1798 | ||
53efb85a | 1799 | memset(&resp, 0, sizeof(resp)); |
c3b7390b | 1800 | resp.status = htobe32(LTTNG_VIEWER_CREATE_SESSION_OK); |
7591bab1 | 1801 | conn->viewer_session = viewer_session_create(); |
c3b7390b JD |
1802 | if (!conn->viewer_session) { |
1803 | ERR("Allocation viewer session"); | |
1804 | resp.status = htobe32(LTTNG_VIEWER_CREATE_SESSION_ERR); | |
1805 | goto send_reply; | |
1806 | } | |
c3b7390b JD |
1807 | |
1808 | send_reply: | |
1809 | health_code_update(); | |
1810 | ret = send_response(conn->sock, &resp, sizeof(resp)); | |
1811 | if (ret < 0) { | |
1812 | goto end; | |
1813 | } | |
1814 | health_code_update(); | |
1815 | ret = 0; | |
1816 | ||
1817 | end: | |
1818 | return ret; | |
1819 | } | |
1820 | ||
d62023be JD |
1821 | /* |
1822 | * Detach a viewer session. | |
1823 | * | |
1824 | * Return 0 on success or else a negative value. | |
1825 | */ | |
1826 | static | |
1827 | int viewer_detach_session(struct relay_connection *conn) | |
1828 | { | |
1829 | int ret; | |
1830 | struct lttng_viewer_detach_session_response response; | |
1831 | struct lttng_viewer_detach_session_request request; | |
1832 | struct relay_session *session = NULL; | |
1833 | uint64_t viewer_session_to_close; | |
1834 | ||
1835 | DBG("Viewer detach session received"); | |
1836 | ||
1837 | assert(conn); | |
1838 | ||
1839 | health_code_update(); | |
1840 | ||
1841 | /* Receive the request from the connected client. */ | |
1842 | ret = recv_request(conn->sock, &request, sizeof(request)); | |
1843 | if (ret < 0) { | |
1844 | goto end; | |
1845 | } | |
1846 | viewer_session_to_close = be64toh(request.session_id); | |
1847 | ||
1848 | if (!conn->viewer_session) { | |
1849 | DBG("Client trying to detach before creating a live viewer session"); | |
1850 | response.status = htobe32(LTTNG_VIEWER_DETACH_SESSION_ERR); | |
1851 | goto send_reply; | |
1852 | } | |
1853 | ||
1854 | health_code_update(); | |
1855 | ||
1856 | memset(&response, 0, sizeof(response)); | |
1857 | DBG("Detaching from session ID %" PRIu64, viewer_session_to_close); | |
1858 | ||
1859 | session = session_get_by_id(be64toh(request.session_id)); | |
1860 | if (!session) { | |
1861 | DBG("Relay session %" PRIu64 " not found", | |
9b9f9f94 | 1862 | (uint64_t) be64toh(request.session_id)); |
d62023be JD |
1863 | response.status = htobe32(LTTNG_VIEWER_DETACH_SESSION_UNK); |
1864 | goto send_reply; | |
1865 | } | |
1866 | ||
1867 | ret = viewer_session_is_attached(conn->viewer_session, session); | |
1868 | if (ret != 1) { | |
1869 | DBG("Not attached to this session"); | |
1870 | response.status = htobe32(LTTNG_VIEWER_DETACH_SESSION_ERR); | |
1871 | goto send_reply_put; | |
1872 | } | |
1873 | ||
1874 | viewer_session_close_one_session(conn->viewer_session, session); | |
1875 | response.status = htobe32(LTTNG_VIEWER_DETACH_SESSION_OK); | |
1876 | DBG("Session %" PRIu64 " detached.", viewer_session_to_close); | |
1877 | ||
1878 | send_reply_put: | |
1879 | session_put(session); | |
1880 | ||
1881 | send_reply: | |
1882 | health_code_update(); | |
1883 | ret = send_response(conn->sock, &response, sizeof(response)); | |
1884 | if (ret < 0) { | |
1885 | goto end; | |
1886 | } | |
1887 | health_code_update(); | |
1888 | ret = 0; | |
1889 | ||
1890 | end: | |
1891 | return ret; | |
1892 | } | |
c3b7390b | 1893 | |
d3e2ba59 JD |
1894 | /* |
1895 | * live_relay_unknown_command: send -1 if received unknown command | |
1896 | */ | |
1897 | static | |
58eb9381 | 1898 | void live_relay_unknown_command(struct relay_connection *conn) |
d3e2ba59 JD |
1899 | { |
1900 | struct lttcomm_relayd_generic_reply reply; | |
d3e2ba59 | 1901 | |
53efb85a | 1902 | memset(&reply, 0, sizeof(reply)); |
d3e2ba59 | 1903 | reply.ret_code = htobe32(LTTNG_ERR_UNK); |
58eb9381 | 1904 | (void) send_response(conn->sock, &reply, sizeof(reply)); |
d3e2ba59 JD |
1905 | } |
1906 | ||
1907 | /* | |
1908 | * Process the commands received on the control socket | |
1909 | */ | |
1910 | static | |
1911 | int process_control(struct lttng_viewer_cmd *recv_hdr, | |
58eb9381 | 1912 | struct relay_connection *conn) |
d3e2ba59 JD |
1913 | { |
1914 | int ret = 0; | |
2f8f53af DG |
1915 | uint32_t msg_value; |
1916 | ||
2f8f53af DG |
1917 | msg_value = be32toh(recv_hdr->cmd); |
1918 | ||
1919 | /* | |
1920 | * Make sure we've done the version check before any command other then a | |
1921 | * new client connection. | |
1922 | */ | |
c4e361a4 | 1923 | if (msg_value != LTTNG_VIEWER_CONNECT && !conn->version_check_done) { |
58eb9381 | 1924 | ERR("Viewer conn value %" PRIu32 " before version check", msg_value); |
2f8f53af DG |
1925 | ret = -1; |
1926 | goto end; | |
1927 | } | |
d3e2ba59 | 1928 | |
2f8f53af | 1929 | switch (msg_value) { |
c4e361a4 | 1930 | case LTTNG_VIEWER_CONNECT: |
58eb9381 | 1931 | ret = viewer_connect(conn); |
d3e2ba59 | 1932 | break; |
c4e361a4 | 1933 | case LTTNG_VIEWER_LIST_SESSIONS: |
58eb9381 | 1934 | ret = viewer_list_sessions(conn); |
d3e2ba59 | 1935 | break; |
c4e361a4 | 1936 | case LTTNG_VIEWER_ATTACH_SESSION: |
58eb9381 | 1937 | ret = viewer_attach_session(conn); |
d3e2ba59 | 1938 | break; |
c4e361a4 | 1939 | case LTTNG_VIEWER_GET_NEXT_INDEX: |
58eb9381 | 1940 | ret = viewer_get_next_index(conn); |
d3e2ba59 | 1941 | break; |
c4e361a4 | 1942 | case LTTNG_VIEWER_GET_PACKET: |
58eb9381 | 1943 | ret = viewer_get_packet(conn); |
d3e2ba59 | 1944 | break; |
c4e361a4 | 1945 | case LTTNG_VIEWER_GET_METADATA: |
58eb9381 | 1946 | ret = viewer_get_metadata(conn); |
d3e2ba59 | 1947 | break; |
c4e361a4 | 1948 | case LTTNG_VIEWER_GET_NEW_STREAMS: |
58eb9381 | 1949 | ret = viewer_get_new_streams(conn); |
80e8027a | 1950 | break; |
c3b7390b JD |
1951 | case LTTNG_VIEWER_CREATE_SESSION: |
1952 | ret = viewer_create_session(conn); | |
1953 | break; | |
d62023be JD |
1954 | case LTTNG_VIEWER_DETACH_SESSION: |
1955 | ret = viewer_detach_session(conn); | |
1956 | break; | |
d3e2ba59 | 1957 | default: |
7591bab1 MD |
1958 | ERR("Received unknown viewer command (%u)", |
1959 | be32toh(recv_hdr->cmd)); | |
58eb9381 | 1960 | live_relay_unknown_command(conn); |
d3e2ba59 JD |
1961 | ret = -1; |
1962 | goto end; | |
1963 | } | |
1964 | ||
1965 | end: | |
1966 | return ret; | |
1967 | } | |
1968 | ||
1969 | static | |
58eb9381 | 1970 | void cleanup_connection_pollfd(struct lttng_poll_event *events, int pollfd) |
d3e2ba59 JD |
1971 | { |
1972 | int ret; | |
1973 | ||
58eb9381 | 1974 | (void) lttng_poll_del(events, pollfd); |
d3e2ba59 JD |
1975 | |
1976 | ret = close(pollfd); | |
1977 | if (ret < 0) { | |
1978 | ERR("Closing pollfd %d", pollfd); | |
1979 | } | |
1980 | } | |
1981 | ||
d3e2ba59 JD |
1982 | /* |
1983 | * This thread does the actual work | |
1984 | */ | |
1985 | static | |
1986 | void *thread_worker(void *data) | |
1987 | { | |
1988 | int ret, err = -1; | |
1989 | uint32_t nb_fd; | |
d3e2ba59 | 1990 | struct lttng_poll_event events; |
7591bab1 | 1991 | struct lttng_ht *viewer_connections_ht; |
d3e2ba59 JD |
1992 | struct lttng_ht_iter iter; |
1993 | struct lttng_viewer_cmd recv_hdr; | |
302d8906 | 1994 | struct relay_connection *destroy_conn; |
d3e2ba59 JD |
1995 | |
1996 | DBG("[thread] Live viewer relay worker started"); | |
1997 | ||
1998 | rcu_register_thread(); | |
1999 | ||
eea7556c MD |
2000 | health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_WORKER); |
2001 | ||
9b5e0863 MD |
2002 | if (testpoint(relayd_thread_live_worker)) { |
2003 | goto error_testpoint; | |
2004 | } | |
2005 | ||
d3e2ba59 | 2006 | /* table of connections indexed on socket */ |
7591bab1 MD |
2007 | viewer_connections_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
2008 | if (!viewer_connections_ht) { | |
2009 | goto viewer_connections_ht_error; | |
d3e2ba59 JD |
2010 | } |
2011 | ||
2012 | ret = create_thread_poll_set(&events, 2); | |
2013 | if (ret < 0) { | |
2014 | goto error_poll_create; | |
2015 | } | |
2016 | ||
58eb9381 | 2017 | ret = lttng_poll_add(&events, live_conn_pipe[0], LPOLLIN | LPOLLRDHUP); |
d3e2ba59 JD |
2018 | if (ret < 0) { |
2019 | goto error; | |
2020 | } | |
2021 | ||
2022 | restart: | |
2023 | while (1) { | |
2024 | int i; | |
2025 | ||
eea7556c MD |
2026 | health_code_update(); |
2027 | ||
d3e2ba59 JD |
2028 | /* Infinite blocking call, waiting for transmission */ |
2029 | DBG3("Relayd live viewer worker thread polling..."); | |
eea7556c | 2030 | health_poll_entry(); |
d3e2ba59 | 2031 | ret = lttng_poll_wait(&events, -1); |
eea7556c | 2032 | health_poll_exit(); |
d3e2ba59 JD |
2033 | if (ret < 0) { |
2034 | /* | |
2035 | * Restart interrupted system call. | |
2036 | */ | |
2037 | if (errno == EINTR) { | |
2038 | goto restart; | |
2039 | } | |
2040 | goto error; | |
2041 | } | |
2042 | ||
2043 | nb_fd = ret; | |
2044 | ||
2045 | /* | |
2046 | * Process control. The control connection is prioritised so we don't | |
2047 | * starve it with high throughput tracing data on the data | |
2048 | * connection. | |
2049 | */ | |
2050 | for (i = 0; i < nb_fd; i++) { | |
2051 | /* Fetch once the poll data */ | |
2052 | uint32_t revents = LTTNG_POLL_GETEV(&events, i); | |
2053 | int pollfd = LTTNG_POLL_GETFD(&events, i); | |
2054 | ||
eea7556c MD |
2055 | health_code_update(); |
2056 | ||
d3e2ba59 | 2057 | /* Thread quit pipe has been closed. Killing thread. */ |
bcf4a440 | 2058 | ret = check_thread_quit_pipe(pollfd, revents); |
d3e2ba59 JD |
2059 | if (ret) { |
2060 | err = 0; | |
2061 | goto exit; | |
2062 | } | |
2063 | ||
7591bab1 | 2064 | /* Inspect the relay conn pipe for new connection. */ |
58eb9381 | 2065 | if (pollfd == live_conn_pipe[0]) { |
03e43155 | 2066 | if (revents & LPOLLIN) { |
302d8906 JG |
2067 | struct relay_connection *conn; |
2068 | ||
7591bab1 MD |
2069 | ret = lttng_read(live_conn_pipe[0], |
2070 | &conn, sizeof(conn)); | |
d3e2ba59 JD |
2071 | if (ret < 0) { |
2072 | goto error; | |
2073 | } | |
73039936 FD |
2074 | ret = lttng_poll_add(&events, |
2075 | conn->sock->fd, | |
58eb9381 | 2076 | LPOLLIN | LPOLLRDHUP); |
73039936 FD |
2077 | if (ret) { |
2078 | ERR("Failed to add new live connection file descriptor to poll set"); | |
2079 | goto error; | |
2080 | } | |
7591bab1 MD |
2081 | connection_ht_add(viewer_connections_ht, conn); |
2082 | DBG("Connection socket %d added to poll", conn->sock->fd); | |
03e43155 MD |
2083 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
2084 | ERR("Relay live pipe error"); | |
2085 | goto error; | |
2086 | } else { | |
2087 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
2088 | goto error; | |
d3e2ba59 | 2089 | } |
58eb9381 | 2090 | } else { |
7591bab1 | 2091 | /* Connection activity. */ |
302d8906 JG |
2092 | struct relay_connection *conn; |
2093 | ||
7591bab1 MD |
2094 | conn = connection_get_by_sock(viewer_connections_ht, pollfd); |
2095 | if (!conn) { | |
2096 | continue; | |
2097 | } | |
58eb9381 | 2098 | |
03e43155 | 2099 | if (revents & LPOLLIN) { |
58eb9381 DG |
2100 | ret = conn->sock->ops->recvmsg(conn->sock, &recv_hdr, |
2101 | sizeof(recv_hdr), 0); | |
d3e2ba59 | 2102 | if (ret <= 0) { |
7591bab1 | 2103 | /* Connection closed. */ |
58eb9381 | 2104 | cleanup_connection_pollfd(&events, pollfd); |
7591bab1 MD |
2105 | /* Put "create" ownership reference. */ |
2106 | connection_put(conn); | |
58eb9381 | 2107 | DBG("Viewer control conn closed with %d", pollfd); |
d3e2ba59 | 2108 | } else { |
58eb9381 | 2109 | ret = process_control(&recv_hdr, conn); |
d3e2ba59 JD |
2110 | if (ret < 0) { |
2111 | /* Clear the session on error. */ | |
58eb9381 | 2112 | cleanup_connection_pollfd(&events, pollfd); |
7591bab1 MD |
2113 | /* Put "create" ownership reference. */ |
2114 | connection_put(conn); | |
d3e2ba59 JD |
2115 | DBG("Viewer connection closed with %d", pollfd); |
2116 | } | |
2117 | } | |
03e43155 MD |
2118 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
2119 | cleanup_connection_pollfd(&events, pollfd); | |
2120 | /* Put "create" ownership reference. */ | |
2121 | connection_put(conn); | |
2122 | } else { | |
2123 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
2124 | connection_put(conn); | |
2125 | goto error; | |
d3e2ba59 | 2126 | } |
7591bab1 MD |
2127 | /* Put local "get_by_sock" reference. */ |
2128 | connection_put(conn); | |
d3e2ba59 JD |
2129 | } |
2130 | } | |
2131 | } | |
2132 | ||
2133 | exit: | |
2134 | error: | |
2135 | lttng_poll_clean(&events); | |
2136 | ||
71efa8ef | 2137 | /* Cleanup remaining connection object. */ |
d3e2ba59 | 2138 | rcu_read_lock(); |
7591bab1 | 2139 | cds_lfht_for_each_entry(viewer_connections_ht->ht, &iter.iter, |
302d8906 | 2140 | destroy_conn, |
58eb9381 | 2141 | sock_n.node) { |
eea7556c | 2142 | health_code_update(); |
7591bab1 | 2143 | connection_put(destroy_conn); |
d3e2ba59 JD |
2144 | } |
2145 | rcu_read_unlock(); | |
2146 | error_poll_create: | |
7591bab1 MD |
2147 | lttng_ht_destroy(viewer_connections_ht); |
2148 | viewer_connections_ht_error: | |
58eb9381 DG |
2149 | /* Close relay conn pipes */ |
2150 | utils_close_pipe(live_conn_pipe); | |
d3e2ba59 JD |
2151 | if (err) { |
2152 | DBG("Viewer worker thread exited with error"); | |
2153 | } | |
2154 | DBG("Viewer worker thread cleanup complete"); | |
9b5e0863 | 2155 | error_testpoint: |
eea7556c MD |
2156 | if (err) { |
2157 | health_error(); | |
2158 | ERR("Health error occurred in %s", __func__); | |
2159 | } | |
2160 | health_unregister(health_relayd); | |
b4aacfdc MD |
2161 | if (lttng_relay_stop_threads()) { |
2162 | ERR("Error stopping threads"); | |
178a0557 | 2163 | } |
d3e2ba59 JD |
2164 | rcu_unregister_thread(); |
2165 | return NULL; | |
2166 | } | |
2167 | ||
2168 | /* | |
2169 | * Create the relay command pipe to wake thread_manage_apps. | |
2170 | * Closed in cleanup(). | |
2171 | */ | |
58eb9381 | 2172 | static int create_conn_pipe(void) |
d3e2ba59 | 2173 | { |
178a0557 MD |
2174 | return utils_create_pipe_cloexec(live_conn_pipe); |
2175 | } | |
d3e2ba59 | 2176 | |
178a0557 | 2177 | int relayd_live_join(void) |
d3e2ba59 | 2178 | { |
178a0557 | 2179 | int ret, retval = 0; |
d3e2ba59 JD |
2180 | void *status; |
2181 | ||
d3e2ba59 | 2182 | ret = pthread_join(live_listener_thread, &status); |
178a0557 MD |
2183 | if (ret) { |
2184 | errno = ret; | |
d3e2ba59 | 2185 | PERROR("pthread_join live listener"); |
178a0557 | 2186 | retval = -1; |
d3e2ba59 JD |
2187 | } |
2188 | ||
2189 | ret = pthread_join(live_worker_thread, &status); | |
178a0557 MD |
2190 | if (ret) { |
2191 | errno = ret; | |
d3e2ba59 | 2192 | PERROR("pthread_join live worker"); |
178a0557 | 2193 | retval = -1; |
d3e2ba59 JD |
2194 | } |
2195 | ||
2196 | ret = pthread_join(live_dispatcher_thread, &status); | |
178a0557 MD |
2197 | if (ret) { |
2198 | errno = ret; | |
d3e2ba59 | 2199 | PERROR("pthread_join live dispatcher"); |
178a0557 | 2200 | retval = -1; |
d3e2ba59 JD |
2201 | } |
2202 | ||
178a0557 | 2203 | cleanup_relayd_live(); |
d3e2ba59 | 2204 | |
178a0557 | 2205 | return retval; |
d3e2ba59 JD |
2206 | } |
2207 | ||
2208 | /* | |
2209 | * main | |
2210 | */ | |
7591bab1 | 2211 | int relayd_live_create(struct lttng_uri *uri) |
d3e2ba59 | 2212 | { |
178a0557 | 2213 | int ret = 0, retval = 0; |
d3e2ba59 JD |
2214 | void *status; |
2215 | int is_root; | |
2216 | ||
178a0557 MD |
2217 | if (!uri) { |
2218 | retval = -1; | |
2219 | goto exit_init_data; | |
2220 | } | |
d3e2ba59 JD |
2221 | live_uri = uri; |
2222 | ||
d3e2ba59 JD |
2223 | /* Check if daemon is UID = 0 */ |
2224 | is_root = !getuid(); | |
2225 | ||
2226 | if (!is_root) { | |
2227 | if (live_uri->port < 1024) { | |
2228 | ERR("Need to be root to use ports < 1024"); | |
178a0557 MD |
2229 | retval = -1; |
2230 | goto exit_init_data; | |
d3e2ba59 JD |
2231 | } |
2232 | } | |
2233 | ||
2234 | /* Setup the thread apps communication pipe. */ | |
178a0557 MD |
2235 | if (create_conn_pipe()) { |
2236 | retval = -1; | |
2237 | goto exit_init_data; | |
d3e2ba59 JD |
2238 | } |
2239 | ||
2240 | /* Init relay command queue. */ | |
8bdee6e2 | 2241 | cds_wfcq_init(&viewer_conn_queue.head, &viewer_conn_queue.tail); |
d3e2ba59 JD |
2242 | |
2243 | /* Set up max poll set size */ | |
25b397f9 MD |
2244 | if (lttng_poll_set_max_size()) { |
2245 | retval = -1; | |
2246 | goto exit_init_data; | |
2247 | } | |
d3e2ba59 JD |
2248 | |
2249 | /* Setup the dispatcher thread */ | |
1a1a34b4 | 2250 | ret = pthread_create(&live_dispatcher_thread, default_pthread_attr(), |
d3e2ba59 | 2251 | thread_dispatcher, (void *) NULL); |
178a0557 MD |
2252 | if (ret) { |
2253 | errno = ret; | |
d3e2ba59 | 2254 | PERROR("pthread_create viewer dispatcher"); |
178a0557 MD |
2255 | retval = -1; |
2256 | goto exit_dispatcher_thread; | |
d3e2ba59 JD |
2257 | } |
2258 | ||
2259 | /* Setup the worker thread */ | |
1a1a34b4 | 2260 | ret = pthread_create(&live_worker_thread, default_pthread_attr(), |
7591bab1 | 2261 | thread_worker, NULL); |
178a0557 MD |
2262 | if (ret) { |
2263 | errno = ret; | |
d3e2ba59 | 2264 | PERROR("pthread_create viewer worker"); |
178a0557 MD |
2265 | retval = -1; |
2266 | goto exit_worker_thread; | |
d3e2ba59 JD |
2267 | } |
2268 | ||
2269 | /* Setup the listener thread */ | |
1a1a34b4 | 2270 | ret = pthread_create(&live_listener_thread, default_pthread_attr(), |
d3e2ba59 | 2271 | thread_listener, (void *) NULL); |
178a0557 MD |
2272 | if (ret) { |
2273 | errno = ret; | |
d3e2ba59 | 2274 | PERROR("pthread_create viewer listener"); |
178a0557 MD |
2275 | retval = -1; |
2276 | goto exit_listener_thread; | |
d3e2ba59 JD |
2277 | } |
2278 | ||
178a0557 MD |
2279 | /* |
2280 | * All OK, started all threads. | |
2281 | */ | |
2282 | return retval; | |
2283 | ||
9911d21b JG |
2284 | /* |
2285 | * Join on the live_listener_thread should anything be added after | |
2286 | * the live_listener thread's creation. | |
2287 | */ | |
d3e2ba59 | 2288 | |
178a0557 | 2289 | exit_listener_thread: |
d3e2ba59 | 2290 | |
d3e2ba59 | 2291 | ret = pthread_join(live_worker_thread, &status); |
178a0557 MD |
2292 | if (ret) { |
2293 | errno = ret; | |
d3e2ba59 | 2294 | PERROR("pthread_join live worker"); |
178a0557 | 2295 | retval = -1; |
d3e2ba59 | 2296 | } |
178a0557 | 2297 | exit_worker_thread: |
d3e2ba59 | 2298 | |
d3e2ba59 | 2299 | ret = pthread_join(live_dispatcher_thread, &status); |
178a0557 MD |
2300 | if (ret) { |
2301 | errno = ret; | |
d3e2ba59 | 2302 | PERROR("pthread_join live dispatcher"); |
178a0557 | 2303 | retval = -1; |
d3e2ba59 | 2304 | } |
178a0557 | 2305 | exit_dispatcher_thread: |
d3e2ba59 | 2306 | |
178a0557 MD |
2307 | exit_init_data: |
2308 | cleanup_relayd_live(); | |
d3e2ba59 | 2309 | |
178a0557 | 2310 | return retval; |
d3e2ba59 | 2311 | } |