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, | |
9a51883c | 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. */ |
9a51883c | 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 | * | |
9a51883c 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 | */ | |
279cc4fe 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); | |
9a51883c | 292 | ASSERT_LOCKED(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) { |
279cc4fe JG |
327 | vstream = viewer_stream_create(stream, |
328 | viewer_trace_chunk, seek_t); | |
2a174661 DG |
329 | if (!vstream) { |
330 | ret = -1; | |
7591bab1 MD |
331 | ctf_trace_put(ctf_trace); |
332 | stream_put(stream); | |
2a174661 DG |
333 | goto error_unlock; |
334 | } | |
2a174661 DG |
335 | |
336 | if (nb_created) { | |
337 | /* Update number of created stream counter. */ | |
338 | (*nb_created)++; | |
339 | } | |
2229a09c MD |
340 | /* |
341 | * Ensure a self-reference is preserved even | |
342 | * after we have put our local reference. | |
343 | */ | |
862d3a3b MD |
344 | if (!viewer_stream_get(vstream)) { |
345 | ERR("Unable to get self-reference on viewer stream, logic error."); | |
346 | abort(); | |
347 | } | |
7591bab1 MD |
348 | } else { |
349 | if (!vstream->sent_flag && nb_unsent) { | |
350 | /* Update number of unsent stream counter. */ | |
351 | (*nb_unsent)++; | |
352 | } | |
2f8f53af | 353 | } |
2a174661 DG |
354 | /* Update number of total stream counter. */ |
355 | if (nb_total) { | |
2229a09c MD |
356 | if (stream->is_metadata) { |
357 | if (!stream->closed || | |
358 | stream->metadata_received > vstream->metadata_sent) { | |
359 | (*nb_total)++; | |
360 | } | |
361 | } else { | |
362 | if (!stream->closed || | |
f15741c1 | 363 | !(((int64_t) (stream->prev_data_seq - stream->last_net_seq_num)) >= 0)) { |
2229a09c MD |
364 | |
365 | (*nb_total)++; | |
366 | } | |
367 | } | |
2f8f53af | 368 | } |
2229a09c MD |
369 | /* Put local reference. */ |
370 | viewer_stream_put(vstream); | |
7591bab1 MD |
371 | next: |
372 | stream_put(stream); | |
2f8f53af | 373 | } |
7591bab1 | 374 | ctf_trace_put(ctf_trace); |
2f8f53af DG |
375 | } |
376 | ||
377 | ret = 0; | |
378 | ||
379 | error_unlock: | |
2a174661 | 380 | rcu_read_unlock(); |
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 | } | |
2288467f | 456 | DBG("Listening on sock %d for lttng-live", sock->fd); |
d3e2ba59 JD |
457 | |
458 | ret = sock->ops->bind(sock); | |
459 | if (ret < 0) { | |
2288467f | 460 | PERROR("Failed to bind lttng-live socket"); |
d3e2ba59 JD |
461 | goto error; |
462 | } | |
463 | ||
464 | ret = sock->ops->listen(sock, -1); | |
465 | if (ret < 0) { | |
466 | goto error; | |
467 | ||
468 | } | |
469 | ||
470 | return sock; | |
471 | ||
472 | error: | |
473 | if (sock) { | |
474 | lttcomm_destroy_sock(sock); | |
475 | } | |
476 | return NULL; | |
477 | } | |
478 | ||
479 | /* | |
480 | * This thread manages the listening for new connections on the network | |
481 | */ | |
482 | static | |
483 | void *thread_listener(void *data) | |
484 | { | |
485 | int i, ret, pollfd, err = -1; | |
d3e2ba59 JD |
486 | uint32_t revents, nb_fd; |
487 | struct lttng_poll_event events; | |
488 | struct lttcomm_sock *live_control_sock; | |
489 | ||
490 | DBG("[thread] Relay live listener started"); | |
491 | ||
eea7556c MD |
492 | health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_LISTENER); |
493 | ||
494 | health_code_update(); | |
495 | ||
d3e2ba59 JD |
496 | live_control_sock = init_socket(live_uri); |
497 | if (!live_control_sock) { | |
498 | goto error_sock_control; | |
499 | } | |
500 | ||
fb4d42ab | 501 | /* Pass 2 as size here for the thread quit pipe and control sockets. */ |
d3e2ba59 JD |
502 | ret = create_thread_poll_set(&events, 2); |
503 | if (ret < 0) { | |
504 | goto error_create_poll; | |
505 | } | |
506 | ||
507 | /* Add the control socket */ | |
508 | ret = lttng_poll_add(&events, live_control_sock->fd, LPOLLIN | LPOLLRDHUP); | |
509 | if (ret < 0) { | |
510 | goto error_poll_add; | |
511 | } | |
512 | ||
3fd27398 MD |
513 | lttng_relay_notify_ready(); |
514 | ||
9b5e0863 MD |
515 | if (testpoint(relayd_thread_live_listener)) { |
516 | goto error_testpoint; | |
517 | } | |
518 | ||
d3e2ba59 | 519 | while (1) { |
eea7556c MD |
520 | health_code_update(); |
521 | ||
d3e2ba59 JD |
522 | DBG("Listener accepting live viewers connections"); |
523 | ||
524 | restart: | |
eea7556c | 525 | health_poll_entry(); |
d3e2ba59 | 526 | ret = lttng_poll_wait(&events, -1); |
eea7556c | 527 | health_poll_exit(); |
d3e2ba59 JD |
528 | if (ret < 0) { |
529 | /* | |
530 | * Restart interrupted system call. | |
531 | */ | |
532 | if (errno == EINTR) { | |
533 | goto restart; | |
534 | } | |
535 | goto error; | |
536 | } | |
537 | nb_fd = ret; | |
538 | ||
539 | DBG("Relay new viewer connection received"); | |
540 | for (i = 0; i < nb_fd; i++) { | |
eea7556c MD |
541 | health_code_update(); |
542 | ||
d3e2ba59 JD |
543 | /* Fetch once the poll data */ |
544 | revents = LTTNG_POLL_GETEV(&events, i); | |
545 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
546 | ||
547 | /* Thread quit pipe has been closed. Killing thread. */ | |
bcf4a440 | 548 | ret = check_thread_quit_pipe(pollfd, revents); |
d3e2ba59 JD |
549 | if (ret) { |
550 | err = 0; | |
551 | goto exit; | |
552 | } | |
553 | ||
03e43155 | 554 | if (revents & LPOLLIN) { |
d3e2ba59 | 555 | /* |
7591bab1 MD |
556 | * A new connection is requested, therefore a |
557 | * viewer connection is allocated in this | |
558 | * thread, enqueued to a global queue and | |
559 | * dequeued (and freed) in the worker thread. | |
d3e2ba59 | 560 | */ |
58eb9381 DG |
561 | int val = 1; |
562 | struct relay_connection *new_conn; | |
d3e2ba59 JD |
563 | struct lttcomm_sock *newsock; |
564 | ||
d3e2ba59 JD |
565 | newsock = live_control_sock->ops->accept(live_control_sock); |
566 | if (!newsock) { | |
567 | PERROR("accepting control sock"); | |
d3e2ba59 JD |
568 | goto error; |
569 | } | |
570 | DBG("Relay viewer connection accepted socket %d", newsock->fd); | |
58eb9381 | 571 | |
d3e2ba59 | 572 | ret = setsockopt(newsock->fd, SOL_SOCKET, SO_REUSEADDR, &val, |
58eb9381 | 573 | sizeof(val)); |
d3e2ba59 JD |
574 | if (ret < 0) { |
575 | PERROR("setsockopt inet"); | |
576 | lttcomm_destroy_sock(newsock); | |
d3e2ba59 JD |
577 | goto error; |
578 | } | |
7591bab1 MD |
579 | new_conn = connection_create(newsock, RELAY_CONNECTION_UNKNOWN); |
580 | if (!new_conn) { | |
581 | lttcomm_destroy_sock(newsock); | |
582 | goto error; | |
583 | } | |
584 | /* Ownership assumed by the connection. */ | |
585 | newsock = NULL; | |
d3e2ba59 | 586 | |
58eb9381 | 587 | /* Enqueue request for the dispatcher thread. */ |
8bdee6e2 SM |
588 | cds_wfcq_enqueue(&viewer_conn_queue.head, &viewer_conn_queue.tail, |
589 | &new_conn->qnode); | |
d3e2ba59 JD |
590 | |
591 | /* | |
7591bab1 MD |
592 | * Wake the dispatch queue futex. |
593 | * Implicit memory barrier with the | |
594 | * exchange in cds_wfcq_enqueue. | |
d3e2ba59 | 595 | */ |
58eb9381 | 596 | futex_nto1_wake(&viewer_conn_queue.futex); |
03e43155 MD |
597 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
598 | ERR("socket poll error"); | |
599 | goto error; | |
600 | } else { | |
601 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
602 | goto error; | |
d3e2ba59 JD |
603 | } |
604 | } | |
605 | } | |
606 | ||
607 | exit: | |
608 | error: | |
609 | error_poll_add: | |
9b5e0863 | 610 | error_testpoint: |
d3e2ba59 JD |
611 | lttng_poll_clean(&events); |
612 | error_create_poll: | |
613 | if (live_control_sock->fd >= 0) { | |
614 | ret = live_control_sock->ops->close(live_control_sock); | |
615 | if (ret) { | |
616 | PERROR("close"); | |
617 | } | |
618 | } | |
619 | lttcomm_destroy_sock(live_control_sock); | |
620 | error_sock_control: | |
621 | if (err) { | |
eea7556c | 622 | health_error(); |
d3e2ba59 JD |
623 | DBG("Live viewer listener thread exited with error"); |
624 | } | |
eea7556c | 625 | health_unregister(health_relayd); |
d3e2ba59 | 626 | DBG("Live viewer listener thread cleanup complete"); |
b4aacfdc MD |
627 | if (lttng_relay_stop_threads()) { |
628 | ERR("Error stopping threads"); | |
178a0557 | 629 | } |
d3e2ba59 JD |
630 | return NULL; |
631 | } | |
632 | ||
633 | /* | |
634 | * This thread manages the dispatching of the requests to worker threads | |
635 | */ | |
636 | static | |
637 | void *thread_dispatcher(void *data) | |
638 | { | |
6cd525e8 MD |
639 | int err = -1; |
640 | ssize_t ret; | |
8bdee6e2 | 641 | struct cds_wfcq_node *node; |
58eb9381 | 642 | struct relay_connection *conn = NULL; |
d3e2ba59 JD |
643 | |
644 | DBG("[thread] Live viewer relay dispatcher started"); | |
645 | ||
eea7556c MD |
646 | health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_DISPATCHER); |
647 | ||
9b5e0863 MD |
648 | if (testpoint(relayd_thread_live_dispatcher)) { |
649 | goto error_testpoint; | |
650 | } | |
651 | ||
eea7556c MD |
652 | health_code_update(); |
653 | ||
0ed3b1a8 | 654 | for (;;) { |
eea7556c MD |
655 | health_code_update(); |
656 | ||
d3e2ba59 | 657 | /* Atomically prepare the queue futex */ |
58eb9381 | 658 | futex_nto1_prepare(&viewer_conn_queue.futex); |
d3e2ba59 | 659 | |
0ed3b1a8 MD |
660 | if (CMM_LOAD_SHARED(live_dispatch_thread_exit)) { |
661 | break; | |
662 | } | |
663 | ||
d3e2ba59 | 664 | do { |
eea7556c MD |
665 | health_code_update(); |
666 | ||
d3e2ba59 | 667 | /* Dequeue commands */ |
8bdee6e2 SM |
668 | node = cds_wfcq_dequeue_blocking(&viewer_conn_queue.head, |
669 | &viewer_conn_queue.tail); | |
d3e2ba59 JD |
670 | if (node == NULL) { |
671 | DBG("Woken up but nothing in the live-viewer " | |
672 | "relay command queue"); | |
673 | /* Continue thread execution */ | |
674 | break; | |
675 | } | |
58eb9381 | 676 | conn = caa_container_of(node, struct relay_connection, qnode); |
d3e2ba59 | 677 | DBG("Dispatching viewer request waiting on sock %d", |
58eb9381 | 678 | conn->sock->fd); |
d3e2ba59 JD |
679 | |
680 | /* | |
7591bab1 MD |
681 | * Inform worker thread of the new request. This |
682 | * call is blocking so we can be assured that | |
683 | * the data will be read at some point in time | |
684 | * or wait to the end of the world :) | |
d3e2ba59 | 685 | */ |
58eb9381 DG |
686 | ret = lttng_write(live_conn_pipe[1], &conn, sizeof(conn)); |
687 | if (ret < 0) { | |
688 | PERROR("write conn pipe"); | |
7591bab1 | 689 | connection_put(conn); |
d3e2ba59 JD |
690 | goto error; |
691 | } | |
692 | } while (node != NULL); | |
693 | ||
694 | /* Futex wait on queue. Blocking call on futex() */ | |
eea7556c | 695 | health_poll_entry(); |
58eb9381 | 696 | futex_nto1_wait(&viewer_conn_queue.futex); |
eea7556c | 697 | health_poll_exit(); |
d3e2ba59 JD |
698 | } |
699 | ||
eea7556c MD |
700 | /* Normal exit, no error */ |
701 | err = 0; | |
702 | ||
d3e2ba59 | 703 | error: |
9b5e0863 | 704 | error_testpoint: |
eea7556c MD |
705 | if (err) { |
706 | health_error(); | |
707 | ERR("Health error occurred in %s", __func__); | |
708 | } | |
709 | health_unregister(health_relayd); | |
d3e2ba59 | 710 | DBG("Live viewer dispatch thread dying"); |
b4aacfdc MD |
711 | if (lttng_relay_stop_threads()) { |
712 | ERR("Error stopping threads"); | |
178a0557 | 713 | } |
d3e2ba59 JD |
714 | return NULL; |
715 | } | |
716 | ||
717 | /* | |
718 | * Establish connection with the viewer and check the versions. | |
719 | * | |
720 | * Return 0 on success or else negative value. | |
721 | */ | |
722 | static | |
58eb9381 | 723 | int viewer_connect(struct relay_connection *conn) |
d3e2ba59 JD |
724 | { |
725 | int ret; | |
726 | struct lttng_viewer_connect reply, msg; | |
727 | ||
58eb9381 | 728 | conn->version_check_done = 1; |
d3e2ba59 | 729 | |
eea7556c MD |
730 | health_code_update(); |
731 | ||
2f8f53af DG |
732 | DBG("Viewer is establishing a connection to the relayd."); |
733 | ||
58eb9381 | 734 | ret = recv_request(conn->sock, &msg, sizeof(msg)); |
2f8f53af | 735 | if (ret < 0) { |
d3e2ba59 JD |
736 | goto end; |
737 | } | |
738 | ||
eea7556c MD |
739 | health_code_update(); |
740 | ||
f46b2ce6 | 741 | memset(&reply, 0, sizeof(reply)); |
d3e2ba59 JD |
742 | reply.major = RELAYD_VERSION_COMM_MAJOR; |
743 | reply.minor = RELAYD_VERSION_COMM_MINOR; | |
744 | ||
745 | /* Major versions must be the same */ | |
746 | if (reply.major != be32toh(msg.major)) { | |
2f8f53af DG |
747 | DBG("Incompatible major versions ([relayd] %u vs [client] %u)", |
748 | reply.major, be32toh(msg.major)); | |
72180669 | 749 | ret = -1; |
d3e2ba59 JD |
750 | goto end; |
751 | } | |
752 | ||
58eb9381 | 753 | conn->major = reply.major; |
d3e2ba59 JD |
754 | /* We adapt to the lowest compatible version */ |
755 | if (reply.minor <= be32toh(msg.minor)) { | |
58eb9381 | 756 | conn->minor = reply.minor; |
d3e2ba59 | 757 | } else { |
58eb9381 | 758 | conn->minor = be32toh(msg.minor); |
d3e2ba59 JD |
759 | } |
760 | ||
c4e361a4 | 761 | if (be32toh(msg.type) == LTTNG_VIEWER_CLIENT_COMMAND) { |
58eb9381 | 762 | conn->type = RELAY_VIEWER_COMMAND; |
c4e361a4 | 763 | } else if (be32toh(msg.type) == LTTNG_VIEWER_CLIENT_NOTIFICATION) { |
58eb9381 | 764 | conn->type = RELAY_VIEWER_NOTIFICATION; |
d3e2ba59 JD |
765 | } else { |
766 | ERR("Unknown connection type : %u", be32toh(msg.type)); | |
767 | ret = -1; | |
768 | goto end; | |
769 | } | |
770 | ||
771 | reply.major = htobe32(reply.major); | |
772 | reply.minor = htobe32(reply.minor); | |
58eb9381 | 773 | if (conn->type == RELAY_VIEWER_COMMAND) { |
93b4787b | 774 | /* |
7591bab1 MD |
775 | * Increment outside of htobe64 macro, because the argument can |
776 | * be used more than once within the macro, and thus the | |
777 | * operation may be undefined. | |
93b4787b | 778 | */ |
7591bab1 | 779 | pthread_mutex_lock(&last_relay_viewer_session_id_lock); |
93b4787b | 780 | last_relay_viewer_session_id++; |
7591bab1 | 781 | pthread_mutex_unlock(&last_relay_viewer_session_id_lock); |
93b4787b | 782 | reply.viewer_session_id = htobe64(last_relay_viewer_session_id); |
d3e2ba59 | 783 | } |
eea7556c MD |
784 | |
785 | health_code_update(); | |
786 | ||
58eb9381 | 787 | ret = send_response(conn->sock, &reply, sizeof(reply)); |
d3e2ba59 | 788 | if (ret < 0) { |
2f8f53af | 789 | goto end; |
d3e2ba59 JD |
790 | } |
791 | ||
eea7556c MD |
792 | health_code_update(); |
793 | ||
58eb9381 | 794 | DBG("Version check done using protocol %u.%u", conn->major, conn->minor); |
d3e2ba59 JD |
795 | ret = 0; |
796 | ||
797 | end: | |
798 | return ret; | |
799 | } | |
800 | ||
801 | /* | |
802 | * Send the viewer the list of current sessions. | |
7591bab1 MD |
803 | * We need to create a copy of the hash table content because otherwise |
804 | * we cannot assume the number of entries stays the same between getting | |
805 | * the number of HT elements and iteration over the HT. | |
d3e2ba59 JD |
806 | * |
807 | * Return 0 on success or else a negative value. | |
808 | */ | |
809 | static | |
58eb9381 | 810 | int viewer_list_sessions(struct relay_connection *conn) |
d3e2ba59 | 811 | { |
5f10c6b1 | 812 | int ret = 0; |
d3e2ba59 | 813 | struct lttng_viewer_list_sessions session_list; |
d3e2ba59 | 814 | struct lttng_ht_iter iter; |
d3e2ba59 | 815 | struct relay_session *session; |
7591bab1 MD |
816 | struct lttng_viewer_session *send_session_buf = NULL; |
817 | uint32_t buf_count = SESSION_BUF_DEFAULT_COUNT; | |
818 | uint32_t count = 0; | |
d3e2ba59 JD |
819 | |
820 | DBG("List sessions received"); | |
821 | ||
7591bab1 MD |
822 | send_session_buf = zmalloc(SESSION_BUF_DEFAULT_COUNT * sizeof(*send_session_buf)); |
823 | if (!send_session_buf) { | |
824 | return -1; | |
d3e2ba59 JD |
825 | } |
826 | ||
7591bab1 MD |
827 | rcu_read_lock(); |
828 | cds_lfht_for_each_entry(sessions_ht->ht, &iter.iter, session, | |
2f8f53af | 829 | session_n.node) { |
7591bab1 | 830 | struct lttng_viewer_session *send_session; |
d3e2ba59 | 831 | |
eea7556c MD |
832 | health_code_update(); |
833 | ||
3c42c3ed | 834 | pthread_mutex_lock(&session->lock); |
0a773807 JR |
835 | if (session->connection_closed) { |
836 | /* Skip closed session */ | |
3c42c3ed JG |
837 | goto next_session; |
838 | } | |
839 | if (!session->current_trace_chunk) { | |
840 | /* | |
841 | * Skip un-attachable session. It is either | |
842 | * being destroyed or has not had a trace | |
843 | * chunk created against it yet. | |
844 | */ | |
845 | goto next_session; | |
0a773807 JR |
846 | } |
847 | ||
7591bab1 MD |
848 | if (count >= buf_count) { |
849 | struct lttng_viewer_session *newbuf; | |
850 | uint32_t new_buf_count = buf_count << 1; | |
eea7556c | 851 | |
7591bab1 MD |
852 | newbuf = realloc(send_session_buf, |
853 | new_buf_count * sizeof(*send_session_buf)); | |
854 | if (!newbuf) { | |
855 | ret = -1; | |
3c42c3ed | 856 | goto break_loop; |
7591bab1 MD |
857 | } |
858 | send_session_buf = newbuf; | |
859 | buf_count = new_buf_count; | |
6763619c | 860 | } |
7591bab1 | 861 | send_session = &send_session_buf[count]; |
bfc3fb17 MD |
862 | if (lttng_strncpy(send_session->session_name, |
863 | session->session_name, | |
864 | sizeof(send_session->session_name))) { | |
865 | ret = -1; | |
3c42c3ed | 866 | goto break_loop; |
bfc3fb17 MD |
867 | } |
868 | if (lttng_strncpy(send_session->hostname, session->hostname, | |
869 | sizeof(send_session->hostname))) { | |
870 | ret = -1; | |
3c42c3ed | 871 | goto break_loop; |
bfc3fb17 | 872 | } |
7591bab1 MD |
873 | send_session->id = htobe64(session->id); |
874 | send_session->live_timer = htobe32(session->live_timer); | |
875 | if (session->viewer_attached) { | |
876 | send_session->clients = htobe32(1); | |
877 | } else { | |
878 | send_session->clients = htobe32(0); | |
d227d5bd | 879 | } |
7591bab1 MD |
880 | send_session->streams = htobe32(session->stream_count); |
881 | count++; | |
3c42c3ed JG |
882 | next_session: |
883 | pthread_mutex_unlock(&session->lock); | |
884 | continue; | |
885 | break_loop: | |
886 | pthread_mutex_unlock(&session->lock); | |
887 | break; | |
7591bab1 MD |
888 | } |
889 | rcu_read_unlock(); | |
5f10c6b1 JG |
890 | if (ret < 0) { |
891 | goto end_free; | |
892 | } | |
d227d5bd | 893 | |
7591bab1 | 894 | session_list.sessions_count = htobe32(count); |
d227d5bd | 895 | |
7591bab1 | 896 | health_code_update(); |
d227d5bd | 897 | |
7591bab1 MD |
898 | ret = send_response(conn->sock, &session_list, sizeof(session_list)); |
899 | if (ret < 0) { | |
900 | goto end_free; | |
d227d5bd | 901 | } |
d227d5bd | 902 | |
7591bab1 | 903 | health_code_update(); |
d227d5bd | 904 | |
7591bab1 MD |
905 | ret = send_response(conn->sock, send_session_buf, |
906 | count * sizeof(*send_session_buf)); | |
907 | if (ret < 0) { | |
908 | goto end_free; | |
d227d5bd | 909 | } |
7591bab1 | 910 | health_code_update(); |
d227d5bd | 911 | |
7591bab1 MD |
912 | ret = 0; |
913 | end_free: | |
914 | free(send_session_buf); | |
915 | return ret; | |
d227d5bd JD |
916 | } |
917 | ||
80e8027a | 918 | /* |
7591bab1 | 919 | * Send the viewer the list of current streams. |
80e8027a JD |
920 | */ |
921 | static | |
58eb9381 | 922 | int viewer_get_new_streams(struct relay_connection *conn) |
80e8027a JD |
923 | { |
924 | int ret, send_streams = 0; | |
7591bab1 | 925 | uint32_t nb_created = 0, nb_unsent = 0, nb_streams = 0, nb_total = 0; |
80e8027a JD |
926 | struct lttng_viewer_new_streams_request request; |
927 | struct lttng_viewer_new_streams_response response; | |
279cc4fe | 928 | struct relay_session *session = NULL; |
6763619c | 929 | uint64_t session_id; |
bddf80e4 | 930 | bool closed = false; |
80e8027a | 931 | |
58eb9381 | 932 | assert(conn); |
80e8027a JD |
933 | |
934 | DBG("Get new streams received"); | |
935 | ||
80e8027a JD |
936 | health_code_update(); |
937 | ||
2f8f53af | 938 | /* Receive the request from the connected client. */ |
58eb9381 | 939 | ret = recv_request(conn->sock, &request, sizeof(request)); |
2f8f53af | 940 | if (ret < 0) { |
80e8027a JD |
941 | goto error; |
942 | } | |
6763619c | 943 | session_id = be64toh(request.session_id); |
80e8027a JD |
944 | |
945 | health_code_update(); | |
946 | ||
53efb85a MD |
947 | memset(&response, 0, sizeof(response)); |
948 | ||
7591bab1 | 949 | session = session_get_by_id(session_id); |
2f8f53af | 950 | if (!session) { |
6763619c | 951 | DBG("Relay session %" PRIu64 " not found", session_id); |
c4e361a4 | 952 | response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_ERR); |
80e8027a JD |
953 | goto send_reply; |
954 | } | |
955 | ||
7591bab1 | 956 | if (!viewer_session_is_attached(conn->viewer_session, session)) { |
c4e361a4 | 957 | response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_ERR); |
80e8027a JD |
958 | goto send_reply; |
959 | } | |
960 | ||
9a51883c | 961 | pthread_mutex_lock(&session->lock); |
bf9f320b JG |
962 | if (!session->current_trace_chunk) { |
963 | /* | |
964 | * Means the session is being destroyed. React the same way | |
965 | * as if it could not be found at all. | |
966 | */ | |
967 | DBG("Relay session %" PRIu64 " has no current trace chunk, replying LTTNG_VIEWER_NEW_STREAMS_ERR", | |
968 | session_id); | |
969 | response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_ERR); | |
970 | goto send_reply_unlock; | |
971 | } | |
972 | ||
279cc4fe JG |
973 | if (!conn->viewer_session->current_trace_chunk && |
974 | session->current_trace_chunk) { | |
975 | ret = viewer_session_set_trace_chunk(conn->viewer_session, | |
976 | session->current_trace_chunk); | |
977 | if (ret) { | |
978 | goto error_unlock_session; | |
979 | } | |
980 | } | |
981 | ret = make_viewer_streams(session, | |
982 | conn->viewer_session->current_trace_chunk, | |
983 | LTTNG_VIEWER_SEEK_LAST, &nb_total, &nb_unsent, | |
bddf80e4 | 984 | &nb_created, &closed); |
2f8f53af | 985 | if (ret < 0) { |
279cc4fe | 986 | goto error_unlock_session; |
2f8f53af | 987 | } |
bf9f320b JG |
988 | send_streams = 1; |
989 | response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_OK); | |
279cc4fe | 990 | |
2f8f53af DG |
991 | /* Only send back the newly created streams with the unsent ones. */ |
992 | nb_streams = nb_created + nb_unsent; | |
80e8027a JD |
993 | response.streams_count = htobe32(nb_streams); |
994 | ||
4479f682 | 995 | /* |
2229a09c MD |
996 | * If the session is closed, HUP when there are no more streams |
997 | * with data. | |
4479f682 | 998 | */ |
bddf80e4 | 999 | if (closed && nb_total == 0) { |
4479f682 | 1000 | send_streams = 0; |
bddf80e4 | 1001 | response.streams_count = 0; |
4479f682 | 1002 | response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_HUP); |
bf9f320b | 1003 | goto send_reply_unlock; |
4479f682 | 1004 | } |
bf9f320b JG |
1005 | send_reply_unlock: |
1006 | pthread_mutex_unlock(&session->lock); | |
4479f682 | 1007 | |
80e8027a JD |
1008 | send_reply: |
1009 | health_code_update(); | |
58eb9381 | 1010 | ret = send_response(conn->sock, &response, sizeof(response)); |
80e8027a | 1011 | if (ret < 0) { |
7591bab1 | 1012 | goto end_put_session; |
80e8027a JD |
1013 | } |
1014 | health_code_update(); | |
1015 | ||
1016 | /* | |
7591bab1 MD |
1017 | * Unknown or empty session, just return gracefully, the viewer |
1018 | * knows what is happening. | |
80e8027a JD |
1019 | */ |
1020 | if (!send_streams || !nb_streams) { | |
1021 | ret = 0; | |
7591bab1 | 1022 | goto end_put_session; |
80e8027a JD |
1023 | } |
1024 | ||
2f8f53af | 1025 | /* |
7591bab1 MD |
1026 | * Send stream and *DON'T* ignore the sent flag so every viewer |
1027 | * streams that were not sent from that point will be sent to | |
1028 | * the viewer. | |
2f8f53af | 1029 | */ |
9a51883c | 1030 | ret = send_viewer_streams(conn->sock, session_id, 0); |
2f8f53af | 1031 | if (ret < 0) { |
7591bab1 | 1032 | goto end_put_session; |
80e8027a JD |
1033 | } |
1034 | ||
7591bab1 MD |
1035 | end_put_session: |
1036 | if (session) { | |
1037 | session_put(session); | |
1038 | } | |
80e8027a JD |
1039 | error: |
1040 | return ret; | |
279cc4fe JG |
1041 | error_unlock_session: |
1042 | pthread_mutex_unlock(&session->lock); | |
1043 | session_put(session); | |
1044 | return ret; | |
80e8027a JD |
1045 | } |
1046 | ||
d3e2ba59 JD |
1047 | /* |
1048 | * Send the viewer the list of current sessions. | |
1049 | */ | |
1050 | static | |
58eb9381 | 1051 | int viewer_attach_session(struct relay_connection *conn) |
d3e2ba59 | 1052 | { |
2f8f53af DG |
1053 | int send_streams = 0; |
1054 | ssize_t ret; | |
80e8027a | 1055 | uint32_t nb_streams = 0; |
2f8f53af | 1056 | enum lttng_viewer_seek seek_type; |
d3e2ba59 JD |
1057 | struct lttng_viewer_attach_session_request request; |
1058 | struct lttng_viewer_attach_session_response response; | |
7591bab1 | 1059 | struct relay_session *session = NULL; |
bddf80e4 | 1060 | bool closed = false; |
9a51883c | 1061 | uint64_t session_id; |
d3e2ba59 | 1062 | |
58eb9381 | 1063 | assert(conn); |
d3e2ba59 | 1064 | |
eea7556c MD |
1065 | health_code_update(); |
1066 | ||
2f8f53af | 1067 | /* Receive the request from the connected client. */ |
58eb9381 | 1068 | ret = recv_request(conn->sock, &request, sizeof(request)); |
2f8f53af | 1069 | if (ret < 0) { |
d3e2ba59 JD |
1070 | goto error; |
1071 | } | |
1072 | ||
9a51883c | 1073 | session_id = be64toh(request.session_id); |
eea7556c MD |
1074 | health_code_update(); |
1075 | ||
53efb85a MD |
1076 | memset(&response, 0, sizeof(response)); |
1077 | ||
c3b7390b JD |
1078 | if (!conn->viewer_session) { |
1079 | DBG("Client trying to attach before creating a live viewer session"); | |
1080 | response.status = htobe32(LTTNG_VIEWER_ATTACH_NO_SESSION); | |
1081 | goto send_reply; | |
1082 | } | |
1083 | ||
9a51883c | 1084 | session = session_get_by_id(session_id); |
2f8f53af | 1085 | if (!session) { |
9a51883c | 1086 | DBG("Relay session %" PRIu64 " not found", session_id); |
c4e361a4 | 1087 | response.status = htobe32(LTTNG_VIEWER_ATTACH_UNK); |
d3e2ba59 JD |
1088 | goto send_reply; |
1089 | } | |
9a51883c | 1090 | DBG("Attach session ID %" PRIu64 " received", session_id); |
d3e2ba59 | 1091 | |
9a51883c | 1092 | pthread_mutex_lock(&session->lock); |
a29d73dd JG |
1093 | if (!session->current_trace_chunk) { |
1094 | /* | |
1095 | * Session is either being destroyed or it never had a trace | |
1096 | * chunk created against it. | |
1097 | */ | |
1098 | DBG("Session requested by live client has no current trace chunk, returning unknown session"); | |
1099 | response.status = htobe32(LTTNG_VIEWER_ATTACH_UNK); | |
1100 | goto send_reply; | |
1101 | } | |
7591bab1 | 1102 | if (session->live_timer == 0) { |
d3e2ba59 | 1103 | DBG("Not live session"); |
c4e361a4 | 1104 | response.status = htobe32(LTTNG_VIEWER_ATTACH_NOT_LIVE); |
d3e2ba59 | 1105 | goto send_reply; |
7591bab1 MD |
1106 | } |
1107 | ||
1108 | send_streams = 1; | |
1109 | ret = viewer_session_attach(conn->viewer_session, session); | |
1110 | if (ret) { | |
1111 | DBG("Already a viewer attached"); | |
1112 | response.status = htobe32(LTTNG_VIEWER_ATTACH_ALREADY); | |
1113 | goto send_reply; | |
d3e2ba59 JD |
1114 | } |
1115 | ||
1116 | switch (be32toh(request.seek)) { | |
c4e361a4 JD |
1117 | case LTTNG_VIEWER_SEEK_BEGINNING: |
1118 | case LTTNG_VIEWER_SEEK_LAST: | |
7591bab1 | 1119 | response.status = htobe32(LTTNG_VIEWER_ATTACH_OK); |
2f8f53af | 1120 | seek_type = be32toh(request.seek); |
d3e2ba59 JD |
1121 | break; |
1122 | default: | |
1123 | ERR("Wrong seek parameter"); | |
c4e361a4 | 1124 | response.status = htobe32(LTTNG_VIEWER_ATTACH_SEEK_ERR); |
d3e2ba59 JD |
1125 | send_streams = 0; |
1126 | goto send_reply; | |
1127 | } | |
1128 | ||
279cc4fe JG |
1129 | if (!conn->viewer_session->current_trace_chunk && |
1130 | session->current_trace_chunk) { | |
1131 | ret = viewer_session_set_trace_chunk(conn->viewer_session, | |
1132 | session->current_trace_chunk); | |
1133 | if (ret) { | |
1134 | goto end_put_session; | |
1135 | } | |
1136 | } | |
1137 | ret = make_viewer_streams(session, | |
1138 | conn->viewer_session->current_trace_chunk, seek_type, | |
1139 | &nb_streams, NULL, NULL, &closed); | |
2f8f53af | 1140 | if (ret < 0) { |
7591bab1 | 1141 | goto end_put_session; |
d3e2ba59 | 1142 | } |
9a51883c JG |
1143 | pthread_mutex_unlock(&session->lock); |
1144 | session_put(session); | |
1145 | session = NULL; | |
1146 | ||
1147 | response.streams_count = htobe32(nb_streams); | |
bddf80e4 MD |
1148 | /* |
1149 | * If the session is closed when the viewer is attaching, it | |
1150 | * means some of the streams may have been concurrently removed, | |
1151 | * so we don't allow the viewer to attach, even if there are | |
1152 | * streams available. | |
1153 | */ | |
1154 | if (closed) { | |
1155 | send_streams = 0; | |
1156 | response.streams_count = 0; | |
44248a33 | 1157 | response.status = htobe32(LTTNG_VIEWER_ATTACH_UNK); |
bddf80e4 MD |
1158 | goto send_reply; |
1159 | } | |
1160 | ||
d3e2ba59 | 1161 | send_reply: |
eea7556c | 1162 | health_code_update(); |
58eb9381 | 1163 | ret = send_response(conn->sock, &response, sizeof(response)); |
d3e2ba59 | 1164 | if (ret < 0) { |
7591bab1 | 1165 | goto end_put_session; |
d3e2ba59 | 1166 | } |
eea7556c | 1167 | health_code_update(); |
d3e2ba59 JD |
1168 | |
1169 | /* | |
7591bab1 MD |
1170 | * Unknown or empty session, just return gracefully, the viewer |
1171 | * knows what is happening. | |
d3e2ba59 | 1172 | */ |
157df586 | 1173 | if (!send_streams || !nb_streams) { |
d3e2ba59 | 1174 | ret = 0; |
7591bab1 | 1175 | goto end_put_session; |
d3e2ba59 JD |
1176 | } |
1177 | ||
2f8f53af | 1178 | /* Send stream and ignore the sent flag. */ |
9a51883c | 1179 | ret = send_viewer_streams(conn->sock, session_id, 1); |
2f8f53af | 1180 | if (ret < 0) { |
7591bab1 | 1181 | goto end_put_session; |
d3e2ba59 | 1182 | } |
d3e2ba59 | 1183 | |
7591bab1 MD |
1184 | end_put_session: |
1185 | if (session) { | |
9a51883c | 1186 | pthread_mutex_unlock(&session->lock); |
7591bab1 MD |
1187 | session_put(session); |
1188 | } | |
4a9daf17 JD |
1189 | error: |
1190 | return ret; | |
1191 | } | |
1192 | ||
878c34cf DG |
1193 | /* |
1194 | * Open the index file if needed for the given vstream. | |
1195 | * | |
f8f3885c MD |
1196 | * If an index file is successfully opened, the vstream will set it as its |
1197 | * current index file. | |
878c34cf DG |
1198 | * |
1199 | * Return 0 on success, a negative value on error (-ENOENT if not ready yet). | |
7591bab1 MD |
1200 | * |
1201 | * Called with rstream lock held. | |
878c34cf DG |
1202 | */ |
1203 | static int try_open_index(struct relay_viewer_stream *vstream, | |
1204 | struct relay_stream *rstream) | |
1205 | { | |
1206 | int ret = 0; | |
1bfb0c63 JG |
1207 | const uint32_t connection_major = rstream->trace->session->major; |
1208 | const uint32_t connection_minor = rstream->trace->session->minor; | |
878c34cf | 1209 | |
f8f3885c | 1210 | if (vstream->index_file) { |
878c34cf DG |
1211 | goto end; |
1212 | } | |
1213 | ||
1214 | /* | |
7591bab1 | 1215 | * First time, we open the index file and at least one index is ready. |
878c34cf | 1216 | */ |
a44ca2ca | 1217 | if (rstream->index_received_seqcount == 0) { |
878c34cf DG |
1218 | ret = -ENOENT; |
1219 | goto end; | |
1220 | } | |
1bfb0c63 | 1221 | vstream->index_file = lttng_index_file_create_from_trace_chunk_read_only( |
279cc4fe | 1222 | vstream->stream_file.trace_chunk, rstream->path_name, |
1bfb0c63 JG |
1223 | rstream->channel_name, rstream->tracefile_size, |
1224 | vstream->current_tracefile_id, | |
1225 | lttng_to_index_major(connection_major, connection_minor), | |
1226 | lttng_to_index_minor(connection_major, connection_minor)); | |
f8f3885c MD |
1227 | if (!vstream->index_file) { |
1228 | ret = -1; | |
878c34cf DG |
1229 | } |
1230 | ||
1231 | end: | |
1232 | return ret; | |
1233 | } | |
1234 | ||
1235 | /* | |
7591bab1 MD |
1236 | * Check the status of the index for the given stream. This function |
1237 | * updates the index structure if needed and can put (close) the vstream | |
1238 | * in the HUP situation. | |
1239 | * | |
1240 | * Return 0 means that we can proceed with the index. A value of 1 means | |
1241 | * that the index has been updated and is ready to be sent to the | |
1242 | * client. A negative value indicates an error that can't be handled. | |
878c34cf | 1243 | * |
7591bab1 | 1244 | * Called with rstream lock held. |
878c34cf DG |
1245 | */ |
1246 | static int check_index_status(struct relay_viewer_stream *vstream, | |
1247 | struct relay_stream *rstream, struct ctf_trace *trace, | |
1248 | struct lttng_viewer_index *index) | |
1249 | { | |
1250 | int ret; | |
1251 | ||
797bc362 | 1252 | if ((trace->session->connection_closed || rstream->closed) |
a44ca2ca MD |
1253 | && rstream->index_received_seqcount |
1254 | == vstream->index_sent_seqcount) { | |
797bc362 MD |
1255 | /* |
1256 | * Last index sent and session connection or relay | |
1257 | * stream are closed. | |
1258 | */ | |
7591bab1 MD |
1259 | index->status = htobe32(LTTNG_VIEWER_INDEX_HUP); |
1260 | goto hup; | |
1261 | } else if (rstream->beacon_ts_end != -1ULL && | |
a44ca2ca MD |
1262 | rstream->index_received_seqcount |
1263 | == vstream->index_sent_seqcount) { | |
7591bab1 MD |
1264 | /* |
1265 | * We've received a synchronization beacon and the last index | |
1266 | * available has been sent, the index for now is inactive. | |
1267 | * | |
1268 | * In this case, we have received a beacon which allows us to | |
1269 | * inform the client of a time interval during which we can | |
1270 | * guarantee that there are no events to read (and never will | |
1271 | * be). | |
1272 | */ | |
1273 | index->status = htobe32(LTTNG_VIEWER_INDEX_INACTIVE); | |
1274 | index->timestamp_end = htobe64(rstream->beacon_ts_end); | |
1275 | index->stream_id = htobe64(rstream->ctf_stream_id); | |
1276 | goto index_ready; | |
a44ca2ca MD |
1277 | } else if (rstream->index_received_seqcount |
1278 | == vstream->index_sent_seqcount) { | |
7591bab1 | 1279 | /* |
a44ca2ca MD |
1280 | * This checks whether received == sent seqcount. In |
1281 | * this case, we have not received a beacon. Therefore, | |
1282 | * we can only ask the client to retry later. | |
7591bab1 MD |
1283 | */ |
1284 | index->status = htobe32(LTTNG_VIEWER_INDEX_RETRY); | |
1285 | goto index_ready; | |
a44ca2ca MD |
1286 | } else if (!tracefile_array_seq_in_file(rstream->tfa, |
1287 | vstream->current_tracefile_id, | |
1288 | vstream->index_sent_seqcount)) { | |
7591bab1 | 1289 | /* |
a44ca2ca MD |
1290 | * The next index we want to send cannot be read either |
1291 | * because we need to perform a rotation, or due to | |
1292 | * the producer having overwritten its trace file. | |
7591bab1 | 1293 | */ |
a44ca2ca | 1294 | DBG("Viewer stream %" PRIu64 " rotation", |
7591bab1 MD |
1295 | vstream->stream->stream_handle); |
1296 | ret = viewer_stream_rotate(vstream); | |
1297 | if (ret < 0) { | |
1298 | goto end; | |
1299 | } else if (ret == 1) { | |
1300 | /* EOF across entire stream. */ | |
1301 | index->status = htobe32(LTTNG_VIEWER_INDEX_HUP); | |
1302 | goto hup; | |
1303 | } | |
7591bab1 | 1304 | /* |
a44ca2ca MD |
1305 | * If we have been pushed due to overwrite, it |
1306 | * necessarily means there is data that can be read in | |
1307 | * the stream. If we rotated because we reached the end | |
1308 | * of a tracefile, it means the following tracefile | |
1309 | * needs to contain at least one index, else we would | |
1310 | * have already returned LTTNG_VIEWER_INDEX_RETRY to the | |
1311 | * viewer. The updated index_sent_seqcount needs to | |
1312 | * point to a readable index entry now. | |
1313 | * | |
1314 | * In the case where we "rotate" on a single file, we | |
1315 | * can end up in a case where the requested index is | |
1316 | * still unavailable. | |
7591bab1 | 1317 | */ |
a44ca2ca MD |
1318 | if (rstream->tracefile_count == 1 && |
1319 | !tracefile_array_seq_in_file( | |
1320 | rstream->tfa, | |
1321 | vstream->current_tracefile_id, | |
1322 | vstream->index_sent_seqcount)) { | |
1323 | index->status = htobe32(LTTNG_VIEWER_INDEX_RETRY); | |
1324 | goto index_ready; | |
878c34cf | 1325 | } |
a44ca2ca MD |
1326 | assert(tracefile_array_seq_in_file(rstream->tfa, |
1327 | vstream->current_tracefile_id, | |
1328 | vstream->index_sent_seqcount)); | |
878c34cf | 1329 | } |
a44ca2ca MD |
1330 | /* ret == 0 means successful so we continue. */ |
1331 | ret = 0; | |
7591bab1 | 1332 | end: |
878c34cf DG |
1333 | return ret; |
1334 | ||
1335 | hup: | |
7591bab1 | 1336 | viewer_stream_put(vstream); |
878c34cf DG |
1337 | index_ready: |
1338 | return 1; | |
1339 | } | |
1340 | ||
d3e2ba59 JD |
1341 | /* |
1342 | * Send the next index for a stream. | |
1343 | * | |
1344 | * Return 0 on success or else a negative value. | |
1345 | */ | |
1346 | static | |
58eb9381 | 1347 | int viewer_get_next_index(struct relay_connection *conn) |
d3e2ba59 JD |
1348 | { |
1349 | int ret; | |
1350 | struct lttng_viewer_get_next_index request_index; | |
1351 | struct lttng_viewer_index viewer_index; | |
50adc264 | 1352 | struct ctf_packet_index packet_index; |
7591bab1 MD |
1353 | struct relay_viewer_stream *vstream = NULL; |
1354 | struct relay_stream *rstream = NULL; | |
1355 | struct ctf_trace *ctf_trace = NULL; | |
1356 | struct relay_viewer_stream *metadata_viewer_stream = NULL; | |
d3e2ba59 | 1357 | |
58eb9381 | 1358 | assert(conn); |
d3e2ba59 JD |
1359 | |
1360 | DBG("Viewer get next index"); | |
1361 | ||
7591bab1 | 1362 | memset(&viewer_index, 0, sizeof(viewer_index)); |
eea7556c | 1363 | health_code_update(); |
2f8f53af | 1364 | |
58eb9381 | 1365 | ret = recv_request(conn->sock, &request_index, sizeof(request_index)); |
2f8f53af | 1366 | if (ret < 0) { |
d3e2ba59 JD |
1367 | goto end; |
1368 | } | |
eea7556c | 1369 | health_code_update(); |
d3e2ba59 | 1370 | |
7591bab1 | 1371 | vstream = viewer_stream_get_by_id(be64toh(request_index.stream_id)); |
6763619c | 1372 | if (!vstream) { |
a44ca2ca | 1373 | DBG("Client requested index of unknown stream id %" PRIu64, |
9b9f9f94 | 1374 | (uint64_t) be64toh(request_index.stream_id)); |
f1883937 MD |
1375 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR); |
1376 | goto send_reply; | |
2a174661 DG |
1377 | } |
1378 | ||
7591bab1 MD |
1379 | /* Use back. ref. Protected by refcounts. */ |
1380 | rstream = vstream->stream; | |
1381 | ctf_trace = rstream->trace; | |
d3e2ba59 | 1382 | |
7591bab1 MD |
1383 | /* metadata_viewer_stream may be NULL. */ |
1384 | metadata_viewer_stream = | |
1385 | ctf_trace_get_viewer_metadata_stream(ctf_trace); | |
2a174661 | 1386 | |
7591bab1 | 1387 | pthread_mutex_lock(&rstream->lock); |
d3e2ba59 JD |
1388 | |
1389 | /* | |
1390 | * The viewer should not ask for index on metadata stream. | |
1391 | */ | |
7591bab1 | 1392 | if (rstream->is_metadata) { |
c4e361a4 | 1393 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_HUP); |
d3e2ba59 JD |
1394 | goto send_reply; |
1395 | } | |
1396 | ||
878c34cf DG |
1397 | /* Try to open an index if one is needed for that stream. */ |
1398 | ret = try_open_index(vstream, rstream); | |
1399 | if (ret < 0) { | |
0e6830aa | 1400 | if (ret == -ENOENT) { |
d3e2ba59 | 1401 | /* |
7591bab1 MD |
1402 | * The index is created only when the first data |
1403 | * packet arrives, it might not be ready at the | |
1404 | * beginning of the session | |
d3e2ba59 | 1405 | */ |
c4e361a4 | 1406 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_RETRY); |
878c34cf DG |
1407 | } else { |
1408 | /* Unhandled error. */ | |
c4e361a4 | 1409 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR); |
d3e2ba59 | 1410 | } |
878c34cf | 1411 | goto send_reply; |
d3e2ba59 JD |
1412 | } |
1413 | ||
878c34cf | 1414 | ret = check_index_status(vstream, rstream, ctf_trace, &viewer_index); |
878c34cf | 1415 | if (ret < 0) { |
7591bab1 | 1416 | goto error_put; |
878c34cf DG |
1417 | } else if (ret == 1) { |
1418 | /* | |
7591bab1 MD |
1419 | * We have no index to send and check_index_status has populated |
1420 | * viewer_index's status. | |
878c34cf | 1421 | */ |
d3e2ba59 JD |
1422 | goto send_reply; |
1423 | } | |
7591bab1 | 1424 | /* At this point, ret is 0 thus we will be able to read the index. */ |
878c34cf | 1425 | assert(!ret); |
d3e2ba59 | 1426 | |
7591bab1 MD |
1427 | /* |
1428 | * vstream->stream_fd may be NULL if it has been closed by | |
1429 | * tracefile rotation, or if we are at the beginning of the | |
1430 | * stream. We open the data stream file here to protect against | |
1431 | * overwrite caused by tracefile rotation (in association with | |
1432 | * unlink performed before overwrite). | |
1433 | */ | |
1bfb0c63 JG |
1434 | if (!vstream->stream_file.fd) { |
1435 | int fd; | |
1436 | char file_path[LTTNG_PATH_MAX]; | |
1437 | enum lttng_trace_chunk_status status; | |
1438 | ||
1439 | ret = utils_stream_file_path(rstream->path_name, | |
1440 | rstream->channel_name, rstream->tracefile_size, | |
1441 | vstream->current_tracefile_id, NULL, file_path, | |
1442 | sizeof(file_path)); | |
7591bab1 MD |
1443 | if (ret < 0) { |
1444 | goto error_put; | |
1445 | } | |
1bfb0c63 JG |
1446 | |
1447 | status = lttng_trace_chunk_open_file( | |
1448 | vstream->stream_file.trace_chunk, | |
1449 | file_path, O_RDONLY, 0, &fd); | |
1450 | if (status != LTTNG_TRACE_CHUNK_STATUS_OK) { | |
1451 | PERROR("Failed to open trace file for viewer stream"); | |
7591bab1 MD |
1452 | goto error_put; |
1453 | } | |
1bfb0c63 JG |
1454 | vstream->stream_file.fd = stream_fd_create(fd); |
1455 | if (!vstream->stream_file.fd) { | |
1456 | if (close(fd)) { | |
1457 | PERROR("Failed to close viewer stream file"); | |
7591bab1 MD |
1458 | } |
1459 | goto error_put; | |
1460 | } | |
d3e2ba59 JD |
1461 | } |
1462 | ||
f04a971b | 1463 | ret = check_new_streams(conn); |
4a9daf17 | 1464 | if (ret < 0) { |
7591bab1 MD |
1465 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR); |
1466 | goto send_reply; | |
4a9daf17 JD |
1467 | } else if (ret == 1) { |
1468 | viewer_index.flags |= LTTNG_VIEWER_FLAG_NEW_STREAM; | |
1469 | } | |
1470 | ||
f8f3885c MD |
1471 | ret = lttng_index_file_read(vstream->index_file, &packet_index); |
1472 | if (ret) { | |
1473 | ERR("Relay error reading index file %d", | |
1474 | vstream->index_file->fd); | |
7591bab1 | 1475 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR); |
6b6b9a5a | 1476 | goto send_reply; |
d3e2ba59 | 1477 | } else { |
c4e361a4 | 1478 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_OK); |
a44ca2ca | 1479 | vstream->index_sent_seqcount++; |
d3e2ba59 JD |
1480 | } |
1481 | ||
1482 | /* | |
1483 | * Indexes are stored in big endian, no need to switch before sending. | |
1484 | */ | |
7591bab1 MD |
1485 | DBG("Sending viewer index for stream %" PRIu64 " offset %" PRIu64, |
1486 | rstream->stream_handle, | |
9b9f9f94 | 1487 | (uint64_t) be64toh(packet_index.offset)); |
d3e2ba59 JD |
1488 | viewer_index.offset = packet_index.offset; |
1489 | viewer_index.packet_size = packet_index.packet_size; | |
1490 | viewer_index.content_size = packet_index.content_size; | |
1491 | viewer_index.timestamp_begin = packet_index.timestamp_begin; | |
1492 | viewer_index.timestamp_end = packet_index.timestamp_end; | |
1493 | viewer_index.events_discarded = packet_index.events_discarded; | |
1494 | viewer_index.stream_id = packet_index.stream_id; | |
1495 | ||
1496 | send_reply: | |
f1883937 MD |
1497 | if (rstream) { |
1498 | pthread_mutex_unlock(&rstream->lock); | |
1499 | } | |
7591bab1 MD |
1500 | |
1501 | if (metadata_viewer_stream) { | |
1502 | pthread_mutex_lock(&metadata_viewer_stream->stream->lock); | |
1503 | DBG("get next index metadata check: recv %" PRIu64 | |
1504 | " sent %" PRIu64, | |
1505 | metadata_viewer_stream->stream->metadata_received, | |
1506 | metadata_viewer_stream->metadata_sent); | |
1507 | if (!metadata_viewer_stream->stream->metadata_received || | |
1508 | metadata_viewer_stream->stream->metadata_received > | |
1509 | metadata_viewer_stream->metadata_sent) { | |
1510 | viewer_index.flags |= LTTNG_VIEWER_FLAG_NEW_METADATA; | |
1511 | } | |
1512 | pthread_mutex_unlock(&metadata_viewer_stream->stream->lock); | |
1513 | } | |
1514 | ||
d3e2ba59 | 1515 | viewer_index.flags = htobe32(viewer_index.flags); |
eea7556c | 1516 | health_code_update(); |
2f8f53af | 1517 | |
58eb9381 | 1518 | ret = send_response(conn->sock, &viewer_index, sizeof(viewer_index)); |
d3e2ba59 | 1519 | if (ret < 0) { |
7591bab1 | 1520 | goto end; |
d3e2ba59 | 1521 | } |
eea7556c | 1522 | health_code_update(); |
d3e2ba59 | 1523 | |
9237e6a1 MD |
1524 | if (vstream) { |
1525 | DBG("Index %" PRIu64 " for stream %" PRIu64 " sent", | |
a44ca2ca | 1526 | vstream->index_sent_seqcount, |
9237e6a1 MD |
1527 | vstream->stream->stream_handle); |
1528 | } | |
d3e2ba59 | 1529 | end: |
7591bab1 MD |
1530 | if (metadata_viewer_stream) { |
1531 | viewer_stream_put(metadata_viewer_stream); | |
1532 | } | |
1533 | if (vstream) { | |
1534 | viewer_stream_put(vstream); | |
1535 | } | |
1536 | return ret; | |
1537 | ||
1538 | error_put: | |
1539 | pthread_mutex_unlock(&rstream->lock); | |
1540 | if (metadata_viewer_stream) { | |
1541 | viewer_stream_put(metadata_viewer_stream); | |
1542 | } | |
1543 | viewer_stream_put(vstream); | |
d3e2ba59 JD |
1544 | return ret; |
1545 | } | |
1546 | ||
1547 | /* | |
1548 | * Send the next index for a stream | |
1549 | * | |
1550 | * Return 0 on success or else a negative value. | |
1551 | */ | |
1552 | static | |
58eb9381 | 1553 | int viewer_get_packet(struct relay_connection *conn) |
d3e2ba59 | 1554 | { |
b6025e94 | 1555 | int ret; |
a5df8828 | 1556 | off_t lseek_ret; |
553b2adb | 1557 | char *reply = NULL; |
d3e2ba59 | 1558 | struct lttng_viewer_get_packet get_packet_info; |
553b2adb | 1559 | struct lttng_viewer_trace_packet reply_header; |
7591bab1 | 1560 | struct relay_viewer_stream *vstream = NULL; |
553b2adb | 1561 | uint32_t reply_size = sizeof(reply_header); |
b6025e94 JR |
1562 | uint32_t packet_data_len = 0; |
1563 | ssize_t read_len; | |
d3e2ba59 JD |
1564 | |
1565 | DBG2("Relay get data packet"); | |
1566 | ||
eea7556c | 1567 | health_code_update(); |
2f8f53af | 1568 | |
7591bab1 MD |
1569 | ret = recv_request(conn->sock, &get_packet_info, |
1570 | sizeof(get_packet_info)); | |
2f8f53af | 1571 | if (ret < 0) { |
d3e2ba59 JD |
1572 | goto end; |
1573 | } | |
eea7556c | 1574 | health_code_update(); |
d3e2ba59 | 1575 | |
0233a6a5 | 1576 | /* From this point on, the error label can be reached. */ |
553b2adb | 1577 | memset(&reply_header, 0, sizeof(reply_header)); |
0233a6a5 | 1578 | |
7591bab1 MD |
1579 | vstream = viewer_stream_get_by_id(be64toh(get_packet_info.stream_id)); |
1580 | if (!vstream) { | |
a44ca2ca | 1581 | DBG("Client requested packet of unknown stream id %" PRIu64, |
9b9f9f94 | 1582 | (uint64_t) be64toh(get_packet_info.stream_id)); |
553b2adb JG |
1583 | reply_header.status = htobe32(LTTNG_VIEWER_GET_PACKET_ERR); |
1584 | goto send_reply_nolock; | |
b6025e94 JR |
1585 | } else { |
1586 | packet_data_len = be32toh(get_packet_info.len); | |
553b2adb | 1587 | reply_size += packet_data_len; |
d3e2ba59 | 1588 | } |
2a174661 | 1589 | |
553b2adb JG |
1590 | reply = zmalloc(reply_size); |
1591 | if (!reply) { | |
1592 | PERROR("packet reply zmalloc"); | |
1593 | reply_size = sizeof(reply_header); | |
d3e2ba59 JD |
1594 | goto error; |
1595 | } | |
1596 | ||
b6025e94 | 1597 | pthread_mutex_lock(&vstream->stream->lock); |
1bfb0c63 JG |
1598 | lseek_ret = lseek(vstream->stream_file.fd->fd, |
1599 | be64toh(get_packet_info.offset), SEEK_SET); | |
a5df8828 | 1600 | if (lseek_ret < 0) { |
1bfb0c63 JG |
1601 | PERROR("lseek fd %d to offset %" PRIu64, |
1602 | vstream->stream_file.fd->fd, | |
1603 | (uint64_t) be64toh(get_packet_info.offset)); | |
7591bab1 | 1604 | goto error; |
d3e2ba59 | 1605 | } |
1bfb0c63 JG |
1606 | read_len = lttng_read(vstream->stream_file.fd->fd, |
1607 | reply + sizeof(reply_header), packet_data_len); | |
b6025e94 | 1608 | if (read_len < packet_data_len) { |
7591bab1 | 1609 | PERROR("Relay reading trace file, fd: %d, offset: %" PRIu64, |
1bfb0c63 | 1610 | vstream->stream_file.fd->fd, |
9b9f9f94 | 1611 | (uint64_t) be64toh(get_packet_info.offset)); |
7591bab1 | 1612 | goto error; |
d3e2ba59 | 1613 | } |
553b2adb JG |
1614 | reply_header.status = htobe32(LTTNG_VIEWER_GET_PACKET_OK); |
1615 | reply_header.len = htobe32(packet_data_len); | |
d3e2ba59 JD |
1616 | goto send_reply; |
1617 | ||
1618 | error: | |
553b2adb | 1619 | reply_header.status = htobe32(LTTNG_VIEWER_GET_PACKET_ERR); |
d3e2ba59 JD |
1620 | |
1621 | send_reply: | |
7591bab1 MD |
1622 | if (vstream) { |
1623 | pthread_mutex_unlock(&vstream->stream->lock); | |
1624 | } | |
1625 | send_reply_nolock: | |
eea7556c MD |
1626 | |
1627 | health_code_update(); | |
2f8f53af | 1628 | |
553b2adb JG |
1629 | if (reply) { |
1630 | memcpy(reply, &reply_header, sizeof(reply_header)); | |
1631 | ret = send_response(conn->sock, reply, reply_size); | |
1632 | } else { | |
1633 | /* No reply to send. */ | |
1634 | ret = send_response(conn->sock, &reply_header, | |
1635 | reply_size); | |
1636 | } | |
1637 | ||
b6025e94 | 1638 | health_code_update(); |
d3e2ba59 | 1639 | if (ret < 0) { |
b6025e94 | 1640 | PERROR("sendmsg of packet data failed"); |
7591bab1 | 1641 | goto end_free; |
d3e2ba59 | 1642 | } |
d3e2ba59 | 1643 | |
553b2adb | 1644 | DBG("Sent %u bytes for stream %" PRIu64, reply_size, |
9b9f9f94 | 1645 | (uint64_t) be64toh(get_packet_info.stream_id)); |
d3e2ba59 | 1646 | |
7591bab1 | 1647 | end_free: |
553b2adb | 1648 | free(reply); |
d3e2ba59 | 1649 | end: |
7591bab1 MD |
1650 | if (vstream) { |
1651 | viewer_stream_put(vstream); | |
1652 | } | |
d3e2ba59 JD |
1653 | return ret; |
1654 | } | |
1655 | ||
1656 | /* | |
1657 | * Send the session's metadata | |
1658 | * | |
1659 | * Return 0 on success else a negative value. | |
1660 | */ | |
1661 | static | |
58eb9381 | 1662 | int viewer_get_metadata(struct relay_connection *conn) |
d3e2ba59 JD |
1663 | { |
1664 | int ret = 0; | |
1665 | ssize_t read_len; | |
1666 | uint64_t len = 0; | |
1667 | char *data = NULL; | |
1668 | struct lttng_viewer_get_metadata request; | |
1669 | struct lttng_viewer_metadata_packet reply; | |
7591bab1 | 1670 | struct relay_viewer_stream *vstream = NULL; |
d3e2ba59 | 1671 | |
58eb9381 | 1672 | assert(conn); |
d3e2ba59 JD |
1673 | |
1674 | DBG("Relay get metadata"); | |
1675 | ||
eea7556c | 1676 | health_code_update(); |
2f8f53af | 1677 | |
58eb9381 | 1678 | ret = recv_request(conn->sock, &request, sizeof(request)); |
2f8f53af | 1679 | if (ret < 0) { |
d3e2ba59 JD |
1680 | goto end; |
1681 | } | |
eea7556c | 1682 | health_code_update(); |
d3e2ba59 | 1683 | |
53efb85a MD |
1684 | memset(&reply, 0, sizeof(reply)); |
1685 | ||
7591bab1 MD |
1686 | vstream = viewer_stream_get_by_id(be64toh(request.stream_id)); |
1687 | if (!vstream) { | |
3b463131 MD |
1688 | /* |
1689 | * The metadata stream can be closed by a CLOSE command | |
1690 | * just before we attach. It can also be closed by | |
1691 | * per-pid tracing during tracing. Therefore, it is | |
1692 | * possible that we cannot find this viewer stream. | |
1693 | * Reply back to the client with an error if we cannot | |
1694 | * find it. | |
1695 | */ | |
a44ca2ca | 1696 | DBG("Client requested metadata of unknown stream id %" PRIu64, |
9b9f9f94 | 1697 | (uint64_t) be64toh(request.stream_id)); |
3b463131 | 1698 | reply.status = htobe32(LTTNG_VIEWER_METADATA_ERR); |
7591bab1 | 1699 | goto send_reply; |
d3e2ba59 | 1700 | } |
7591bab1 MD |
1701 | pthread_mutex_lock(&vstream->stream->lock); |
1702 | if (!vstream->stream->is_metadata) { | |
1703 | ERR("Invalid metadata stream"); | |
6763619c JD |
1704 | goto error; |
1705 | } | |
1706 | ||
7591bab1 | 1707 | assert(vstream->metadata_sent <= vstream->stream->metadata_received); |
2a174661 | 1708 | |
7591bab1 | 1709 | len = vstream->stream->metadata_received - vstream->metadata_sent; |
d3e2ba59 | 1710 | if (len == 0) { |
c4e361a4 | 1711 | reply.status = htobe32(LTTNG_VIEWER_NO_NEW_METADATA); |
d3e2ba59 JD |
1712 | goto send_reply; |
1713 | } | |
1714 | ||
1715 | /* first time, we open the metadata file */ | |
1bfb0c63 JG |
1716 | if (!vstream->stream_file.fd) { |
1717 | int fd; | |
1718 | char file_path[LTTNG_PATH_MAX]; | |
1719 | enum lttng_trace_chunk_status status; | |
1720 | struct relay_stream *rstream = vstream->stream; | |
1721 | ||
1722 | ret = utils_stream_file_path(rstream->path_name, | |
1723 | rstream->channel_name, rstream->tracefile_size, | |
1724 | vstream->current_tracefile_id, NULL, file_path, | |
1725 | sizeof(file_path)); | |
d3e2ba59 JD |
1726 | if (ret < 0) { |
1727 | goto error; | |
1728 | } | |
1bfb0c63 JG |
1729 | |
1730 | status = lttng_trace_chunk_open_file( | |
1731 | vstream->stream_file.trace_chunk, | |
1732 | file_path, O_RDONLY, 0, &fd); | |
1733 | if (status != LTTNG_TRACE_CHUNK_STATUS_OK) { | |
1734 | PERROR("Failed to open metadata file for viewer stream"); | |
d3e2ba59 JD |
1735 | goto error; |
1736 | } | |
1bfb0c63 JG |
1737 | vstream->stream_file.fd = stream_fd_create(fd); |
1738 | if (!vstream->stream_file.fd) { | |
1739 | if (close(fd)) { | |
1740 | PERROR("Failed to close viewer metadata file"); | |
7591bab1 MD |
1741 | } |
1742 | goto error; | |
1743 | } | |
d3e2ba59 JD |
1744 | } |
1745 | ||
1746 | reply.len = htobe64(len); | |
1747 | data = zmalloc(len); | |
1748 | if (!data) { | |
1749 | PERROR("viewer metadata zmalloc"); | |
1750 | goto error; | |
1751 | } | |
1752 | ||
1bfb0c63 | 1753 | read_len = lttng_read(vstream->stream_file.fd->fd, data, len); |
6cd525e8 | 1754 | if (read_len < len) { |
d3e2ba59 JD |
1755 | PERROR("Relay reading metadata file"); |
1756 | goto error; | |
1757 | } | |
7591bab1 MD |
1758 | vstream->metadata_sent += read_len; |
1759 | if (vstream->metadata_sent == vstream->stream->metadata_received | |
1760 | && vstream->stream->closed) { | |
1761 | /* Release ownership for the viewer metadata stream. */ | |
1762 | viewer_stream_put(vstream); | |
1763 | } | |
1764 | ||
c4e361a4 | 1765 | reply.status = htobe32(LTTNG_VIEWER_METADATA_OK); |
7591bab1 | 1766 | |
d3e2ba59 JD |
1767 | goto send_reply; |
1768 | ||
1769 | error: | |
c4e361a4 | 1770 | reply.status = htobe32(LTTNG_VIEWER_METADATA_ERR); |
d3e2ba59 JD |
1771 | |
1772 | send_reply: | |
eea7556c | 1773 | health_code_update(); |
7591bab1 MD |
1774 | if (vstream) { |
1775 | pthread_mutex_unlock(&vstream->stream->lock); | |
1776 | } | |
58eb9381 | 1777 | ret = send_response(conn->sock, &reply, sizeof(reply)); |
d3e2ba59 | 1778 | if (ret < 0) { |
7591bab1 | 1779 | goto end_free; |
d3e2ba59 | 1780 | } |
eea7556c | 1781 | health_code_update(); |
d3e2ba59 JD |
1782 | |
1783 | if (len > 0) { | |
58eb9381 | 1784 | ret = send_response(conn->sock, data, len); |
d3e2ba59 | 1785 | if (ret < 0) { |
7591bab1 | 1786 | goto end_free; |
d3e2ba59 JD |
1787 | } |
1788 | } | |
1789 | ||
1790 | DBG("Sent %" PRIu64 " bytes of metadata for stream %" PRIu64, len, | |
9b9f9f94 | 1791 | (uint64_t) be64toh(request.stream_id)); |
d3e2ba59 JD |
1792 | |
1793 | DBG("Metadata sent"); | |
1794 | ||
7591bab1 | 1795 | end_free: |
d3e2ba59 | 1796 | free(data); |
d3e2ba59 | 1797 | end: |
7591bab1 MD |
1798 | if (vstream) { |
1799 | viewer_stream_put(vstream); | |
1800 | } | |
d3e2ba59 JD |
1801 | return ret; |
1802 | } | |
1803 | ||
c3b7390b JD |
1804 | /* |
1805 | * Create a viewer session. | |
1806 | * | |
1807 | * Return 0 on success or else a negative value. | |
1808 | */ | |
1809 | static | |
1810 | int viewer_create_session(struct relay_connection *conn) | |
1811 | { | |
1812 | int ret; | |
1813 | struct lttng_viewer_create_session_response resp; | |
1814 | ||
1815 | DBG("Viewer create session received"); | |
1816 | ||
53efb85a | 1817 | memset(&resp, 0, sizeof(resp)); |
c3b7390b | 1818 | resp.status = htobe32(LTTNG_VIEWER_CREATE_SESSION_OK); |
7591bab1 | 1819 | conn->viewer_session = viewer_session_create(); |
c3b7390b JD |
1820 | if (!conn->viewer_session) { |
1821 | ERR("Allocation viewer session"); | |
1822 | resp.status = htobe32(LTTNG_VIEWER_CREATE_SESSION_ERR); | |
1823 | goto send_reply; | |
1824 | } | |
c3b7390b JD |
1825 | |
1826 | send_reply: | |
1827 | health_code_update(); | |
1828 | ret = send_response(conn->sock, &resp, sizeof(resp)); | |
1829 | if (ret < 0) { | |
1830 | goto end; | |
1831 | } | |
1832 | health_code_update(); | |
1833 | ret = 0; | |
1834 | ||
1835 | end: | |
1836 | return ret; | |
1837 | } | |
1838 | ||
d62023be JD |
1839 | /* |
1840 | * Detach a viewer session. | |
1841 | * | |
1842 | * Return 0 on success or else a negative value. | |
1843 | */ | |
1844 | static | |
1845 | int viewer_detach_session(struct relay_connection *conn) | |
1846 | { | |
1847 | int ret; | |
1848 | struct lttng_viewer_detach_session_response response; | |
1849 | struct lttng_viewer_detach_session_request request; | |
1850 | struct relay_session *session = NULL; | |
1851 | uint64_t viewer_session_to_close; | |
1852 | ||
1853 | DBG("Viewer detach session received"); | |
1854 | ||
1855 | assert(conn); | |
1856 | ||
1857 | health_code_update(); | |
1858 | ||
1859 | /* Receive the request from the connected client. */ | |
1860 | ret = recv_request(conn->sock, &request, sizeof(request)); | |
1861 | if (ret < 0) { | |
1862 | goto end; | |
1863 | } | |
1864 | viewer_session_to_close = be64toh(request.session_id); | |
1865 | ||
1866 | if (!conn->viewer_session) { | |
1867 | DBG("Client trying to detach before creating a live viewer session"); | |
1868 | response.status = htobe32(LTTNG_VIEWER_DETACH_SESSION_ERR); | |
1869 | goto send_reply; | |
1870 | } | |
1871 | ||
1872 | health_code_update(); | |
1873 | ||
1874 | memset(&response, 0, sizeof(response)); | |
1875 | DBG("Detaching from session ID %" PRIu64, viewer_session_to_close); | |
1876 | ||
1877 | session = session_get_by_id(be64toh(request.session_id)); | |
1878 | if (!session) { | |
1879 | DBG("Relay session %" PRIu64 " not found", | |
9b9f9f94 | 1880 | (uint64_t) be64toh(request.session_id)); |
d62023be JD |
1881 | response.status = htobe32(LTTNG_VIEWER_DETACH_SESSION_UNK); |
1882 | goto send_reply; | |
1883 | } | |
1884 | ||
1885 | ret = viewer_session_is_attached(conn->viewer_session, session); | |
1886 | if (ret != 1) { | |
1887 | DBG("Not attached to this session"); | |
1888 | response.status = htobe32(LTTNG_VIEWER_DETACH_SESSION_ERR); | |
1889 | goto send_reply_put; | |
1890 | } | |
1891 | ||
1892 | viewer_session_close_one_session(conn->viewer_session, session); | |
1893 | response.status = htobe32(LTTNG_VIEWER_DETACH_SESSION_OK); | |
1894 | DBG("Session %" PRIu64 " detached.", viewer_session_to_close); | |
1895 | ||
1896 | send_reply_put: | |
1897 | session_put(session); | |
1898 | ||
1899 | send_reply: | |
1900 | health_code_update(); | |
1901 | ret = send_response(conn->sock, &response, sizeof(response)); | |
1902 | if (ret < 0) { | |
1903 | goto end; | |
1904 | } | |
1905 | health_code_update(); | |
1906 | ret = 0; | |
1907 | ||
1908 | end: | |
1909 | return ret; | |
1910 | } | |
c3b7390b | 1911 | |
d3e2ba59 JD |
1912 | /* |
1913 | * live_relay_unknown_command: send -1 if received unknown command | |
1914 | */ | |
1915 | static | |
58eb9381 | 1916 | void live_relay_unknown_command(struct relay_connection *conn) |
d3e2ba59 JD |
1917 | { |
1918 | struct lttcomm_relayd_generic_reply reply; | |
d3e2ba59 | 1919 | |
53efb85a | 1920 | memset(&reply, 0, sizeof(reply)); |
d3e2ba59 | 1921 | reply.ret_code = htobe32(LTTNG_ERR_UNK); |
58eb9381 | 1922 | (void) send_response(conn->sock, &reply, sizeof(reply)); |
d3e2ba59 JD |
1923 | } |
1924 | ||
1925 | /* | |
1926 | * Process the commands received on the control socket | |
1927 | */ | |
1928 | static | |
1929 | int process_control(struct lttng_viewer_cmd *recv_hdr, | |
58eb9381 | 1930 | struct relay_connection *conn) |
d3e2ba59 JD |
1931 | { |
1932 | int ret = 0; | |
2f8f53af DG |
1933 | uint32_t msg_value; |
1934 | ||
2f8f53af DG |
1935 | msg_value = be32toh(recv_hdr->cmd); |
1936 | ||
1937 | /* | |
1938 | * Make sure we've done the version check before any command other then a | |
1939 | * new client connection. | |
1940 | */ | |
c4e361a4 | 1941 | if (msg_value != LTTNG_VIEWER_CONNECT && !conn->version_check_done) { |
58eb9381 | 1942 | ERR("Viewer conn value %" PRIu32 " before version check", msg_value); |
2f8f53af DG |
1943 | ret = -1; |
1944 | goto end; | |
1945 | } | |
d3e2ba59 | 1946 | |
2f8f53af | 1947 | switch (msg_value) { |
c4e361a4 | 1948 | case LTTNG_VIEWER_CONNECT: |
58eb9381 | 1949 | ret = viewer_connect(conn); |
d3e2ba59 | 1950 | break; |
c4e361a4 | 1951 | case LTTNG_VIEWER_LIST_SESSIONS: |
58eb9381 | 1952 | ret = viewer_list_sessions(conn); |
d3e2ba59 | 1953 | break; |
c4e361a4 | 1954 | case LTTNG_VIEWER_ATTACH_SESSION: |
58eb9381 | 1955 | ret = viewer_attach_session(conn); |
d3e2ba59 | 1956 | break; |
c4e361a4 | 1957 | case LTTNG_VIEWER_GET_NEXT_INDEX: |
58eb9381 | 1958 | ret = viewer_get_next_index(conn); |
d3e2ba59 | 1959 | break; |
c4e361a4 | 1960 | case LTTNG_VIEWER_GET_PACKET: |
58eb9381 | 1961 | ret = viewer_get_packet(conn); |
d3e2ba59 | 1962 | break; |
c4e361a4 | 1963 | case LTTNG_VIEWER_GET_METADATA: |
58eb9381 | 1964 | ret = viewer_get_metadata(conn); |
d3e2ba59 | 1965 | break; |
c4e361a4 | 1966 | case LTTNG_VIEWER_GET_NEW_STREAMS: |
58eb9381 | 1967 | ret = viewer_get_new_streams(conn); |
80e8027a | 1968 | break; |
c3b7390b JD |
1969 | case LTTNG_VIEWER_CREATE_SESSION: |
1970 | ret = viewer_create_session(conn); | |
1971 | break; | |
d62023be JD |
1972 | case LTTNG_VIEWER_DETACH_SESSION: |
1973 | ret = viewer_detach_session(conn); | |
1974 | break; | |
d3e2ba59 | 1975 | default: |
7591bab1 MD |
1976 | ERR("Received unknown viewer command (%u)", |
1977 | be32toh(recv_hdr->cmd)); | |
58eb9381 | 1978 | live_relay_unknown_command(conn); |
d3e2ba59 JD |
1979 | ret = -1; |
1980 | goto end; | |
1981 | } | |
1982 | ||
1983 | end: | |
1984 | return ret; | |
1985 | } | |
1986 | ||
1987 | static | |
58eb9381 | 1988 | void cleanup_connection_pollfd(struct lttng_poll_event *events, int pollfd) |
d3e2ba59 JD |
1989 | { |
1990 | int ret; | |
1991 | ||
58eb9381 | 1992 | (void) lttng_poll_del(events, pollfd); |
d3e2ba59 JD |
1993 | |
1994 | ret = close(pollfd); | |
1995 | if (ret < 0) { | |
1996 | ERR("Closing pollfd %d", pollfd); | |
1997 | } | |
1998 | } | |
1999 | ||
d3e2ba59 JD |
2000 | /* |
2001 | * This thread does the actual work | |
2002 | */ | |
2003 | static | |
2004 | void *thread_worker(void *data) | |
2005 | { | |
2006 | int ret, err = -1; | |
2007 | uint32_t nb_fd; | |
d3e2ba59 | 2008 | struct lttng_poll_event events; |
7591bab1 | 2009 | struct lttng_ht *viewer_connections_ht; |
d3e2ba59 JD |
2010 | struct lttng_ht_iter iter; |
2011 | struct lttng_viewer_cmd recv_hdr; | |
302d8906 | 2012 | struct relay_connection *destroy_conn; |
d3e2ba59 JD |
2013 | |
2014 | DBG("[thread] Live viewer relay worker started"); | |
2015 | ||
2016 | rcu_register_thread(); | |
2017 | ||
eea7556c MD |
2018 | health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_WORKER); |
2019 | ||
9b5e0863 MD |
2020 | if (testpoint(relayd_thread_live_worker)) { |
2021 | goto error_testpoint; | |
2022 | } | |
2023 | ||
d3e2ba59 | 2024 | /* table of connections indexed on socket */ |
7591bab1 MD |
2025 | viewer_connections_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
2026 | if (!viewer_connections_ht) { | |
2027 | goto viewer_connections_ht_error; | |
d3e2ba59 JD |
2028 | } |
2029 | ||
2030 | ret = create_thread_poll_set(&events, 2); | |
2031 | if (ret < 0) { | |
2032 | goto error_poll_create; | |
2033 | } | |
2034 | ||
58eb9381 | 2035 | ret = lttng_poll_add(&events, live_conn_pipe[0], LPOLLIN | LPOLLRDHUP); |
d3e2ba59 JD |
2036 | if (ret < 0) { |
2037 | goto error; | |
2038 | } | |
2039 | ||
2040 | restart: | |
2041 | while (1) { | |
2042 | int i; | |
2043 | ||
eea7556c MD |
2044 | health_code_update(); |
2045 | ||
d3e2ba59 JD |
2046 | /* Infinite blocking call, waiting for transmission */ |
2047 | DBG3("Relayd live viewer worker thread polling..."); | |
eea7556c | 2048 | health_poll_entry(); |
d3e2ba59 | 2049 | ret = lttng_poll_wait(&events, -1); |
eea7556c | 2050 | health_poll_exit(); |
d3e2ba59 JD |
2051 | if (ret < 0) { |
2052 | /* | |
2053 | * Restart interrupted system call. | |
2054 | */ | |
2055 | if (errno == EINTR) { | |
2056 | goto restart; | |
2057 | } | |
2058 | goto error; | |
2059 | } | |
2060 | ||
2061 | nb_fd = ret; | |
2062 | ||
2063 | /* | |
2064 | * Process control. The control connection is prioritised so we don't | |
2065 | * starve it with high throughput tracing data on the data | |
2066 | * connection. | |
2067 | */ | |
2068 | for (i = 0; i < nb_fd; i++) { | |
2069 | /* Fetch once the poll data */ | |
2070 | uint32_t revents = LTTNG_POLL_GETEV(&events, i); | |
2071 | int pollfd = LTTNG_POLL_GETFD(&events, i); | |
2072 | ||
eea7556c MD |
2073 | health_code_update(); |
2074 | ||
d3e2ba59 | 2075 | /* Thread quit pipe has been closed. Killing thread. */ |
bcf4a440 | 2076 | ret = check_thread_quit_pipe(pollfd, revents); |
d3e2ba59 JD |
2077 | if (ret) { |
2078 | err = 0; | |
2079 | goto exit; | |
2080 | } | |
2081 | ||
7591bab1 | 2082 | /* Inspect the relay conn pipe for new connection. */ |
58eb9381 | 2083 | if (pollfd == live_conn_pipe[0]) { |
03e43155 | 2084 | if (revents & LPOLLIN) { |
302d8906 JG |
2085 | struct relay_connection *conn; |
2086 | ||
7591bab1 MD |
2087 | ret = lttng_read(live_conn_pipe[0], |
2088 | &conn, sizeof(conn)); | |
d3e2ba59 JD |
2089 | if (ret < 0) { |
2090 | goto error; | |
2091 | } | |
899ae264 FD |
2092 | ret = lttng_poll_add(&events, |
2093 | conn->sock->fd, | |
58eb9381 | 2094 | LPOLLIN | LPOLLRDHUP); |
899ae264 FD |
2095 | if (ret) { |
2096 | ERR("Failed to add new live connection file descriptor to poll set"); | |
2097 | goto error; | |
2098 | } | |
7591bab1 MD |
2099 | connection_ht_add(viewer_connections_ht, conn); |
2100 | DBG("Connection socket %d added to poll", conn->sock->fd); | |
03e43155 MD |
2101 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
2102 | ERR("Relay live pipe error"); | |
2103 | goto error; | |
2104 | } else { | |
2105 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
2106 | goto error; | |
d3e2ba59 | 2107 | } |
58eb9381 | 2108 | } else { |
7591bab1 | 2109 | /* Connection activity. */ |
302d8906 JG |
2110 | struct relay_connection *conn; |
2111 | ||
7591bab1 MD |
2112 | conn = connection_get_by_sock(viewer_connections_ht, pollfd); |
2113 | if (!conn) { | |
2114 | continue; | |
2115 | } | |
58eb9381 | 2116 | |
03e43155 | 2117 | if (revents & LPOLLIN) { |
58eb9381 DG |
2118 | ret = conn->sock->ops->recvmsg(conn->sock, &recv_hdr, |
2119 | sizeof(recv_hdr), 0); | |
d3e2ba59 | 2120 | if (ret <= 0) { |
7591bab1 | 2121 | /* Connection closed. */ |
58eb9381 | 2122 | cleanup_connection_pollfd(&events, pollfd); |
7591bab1 MD |
2123 | /* Put "create" ownership reference. */ |
2124 | connection_put(conn); | |
58eb9381 | 2125 | DBG("Viewer control conn closed with %d", pollfd); |
d3e2ba59 | 2126 | } else { |
58eb9381 | 2127 | ret = process_control(&recv_hdr, conn); |
d3e2ba59 JD |
2128 | if (ret < 0) { |
2129 | /* Clear the session on error. */ | |
58eb9381 | 2130 | cleanup_connection_pollfd(&events, pollfd); |
7591bab1 MD |
2131 | /* Put "create" ownership reference. */ |
2132 | connection_put(conn); | |
d3e2ba59 JD |
2133 | DBG("Viewer connection closed with %d", pollfd); |
2134 | } | |
2135 | } | |
03e43155 MD |
2136 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
2137 | cleanup_connection_pollfd(&events, pollfd); | |
2138 | /* Put "create" ownership reference. */ | |
2139 | connection_put(conn); | |
2140 | } else { | |
2141 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
2142 | connection_put(conn); | |
2143 | goto error; | |
d3e2ba59 | 2144 | } |
7591bab1 MD |
2145 | /* Put local "get_by_sock" reference. */ |
2146 | connection_put(conn); | |
d3e2ba59 JD |
2147 | } |
2148 | } | |
2149 | } | |
2150 | ||
2151 | exit: | |
2152 | error: | |
2153 | lttng_poll_clean(&events); | |
2154 | ||
71efa8ef | 2155 | /* Cleanup remaining connection object. */ |
d3e2ba59 | 2156 | rcu_read_lock(); |
7591bab1 | 2157 | cds_lfht_for_each_entry(viewer_connections_ht->ht, &iter.iter, |
302d8906 | 2158 | destroy_conn, |
58eb9381 | 2159 | sock_n.node) { |
eea7556c | 2160 | health_code_update(); |
7591bab1 | 2161 | connection_put(destroy_conn); |
d3e2ba59 JD |
2162 | } |
2163 | rcu_read_unlock(); | |
2164 | error_poll_create: | |
7591bab1 MD |
2165 | lttng_ht_destroy(viewer_connections_ht); |
2166 | viewer_connections_ht_error: | |
58eb9381 DG |
2167 | /* Close relay conn pipes */ |
2168 | utils_close_pipe(live_conn_pipe); | |
d3e2ba59 JD |
2169 | if (err) { |
2170 | DBG("Viewer worker thread exited with error"); | |
2171 | } | |
2172 | DBG("Viewer worker thread cleanup complete"); | |
9b5e0863 | 2173 | error_testpoint: |
eea7556c MD |
2174 | if (err) { |
2175 | health_error(); | |
2176 | ERR("Health error occurred in %s", __func__); | |
2177 | } | |
2178 | health_unregister(health_relayd); | |
b4aacfdc MD |
2179 | if (lttng_relay_stop_threads()) { |
2180 | ERR("Error stopping threads"); | |
178a0557 | 2181 | } |
d3e2ba59 JD |
2182 | rcu_unregister_thread(); |
2183 | return NULL; | |
2184 | } | |
2185 | ||
2186 | /* | |
2187 | * Create the relay command pipe to wake thread_manage_apps. | |
2188 | * Closed in cleanup(). | |
2189 | */ | |
58eb9381 | 2190 | static int create_conn_pipe(void) |
d3e2ba59 | 2191 | { |
178a0557 MD |
2192 | return utils_create_pipe_cloexec(live_conn_pipe); |
2193 | } | |
d3e2ba59 | 2194 | |
178a0557 | 2195 | int relayd_live_join(void) |
d3e2ba59 | 2196 | { |
178a0557 | 2197 | int ret, retval = 0; |
d3e2ba59 JD |
2198 | void *status; |
2199 | ||
d3e2ba59 | 2200 | ret = pthread_join(live_listener_thread, &status); |
178a0557 MD |
2201 | if (ret) { |
2202 | errno = ret; | |
d3e2ba59 | 2203 | PERROR("pthread_join live listener"); |
178a0557 | 2204 | retval = -1; |
d3e2ba59 JD |
2205 | } |
2206 | ||
2207 | ret = pthread_join(live_worker_thread, &status); | |
178a0557 MD |
2208 | if (ret) { |
2209 | errno = ret; | |
d3e2ba59 | 2210 | PERROR("pthread_join live worker"); |
178a0557 | 2211 | retval = -1; |
d3e2ba59 JD |
2212 | } |
2213 | ||
2214 | ret = pthread_join(live_dispatcher_thread, &status); | |
178a0557 MD |
2215 | if (ret) { |
2216 | errno = ret; | |
d3e2ba59 | 2217 | PERROR("pthread_join live dispatcher"); |
178a0557 | 2218 | retval = -1; |
d3e2ba59 JD |
2219 | } |
2220 | ||
178a0557 | 2221 | cleanup_relayd_live(); |
d3e2ba59 | 2222 | |
178a0557 | 2223 | return retval; |
d3e2ba59 JD |
2224 | } |
2225 | ||
2226 | /* | |
2227 | * main | |
2228 | */ | |
7591bab1 | 2229 | int relayd_live_create(struct lttng_uri *uri) |
d3e2ba59 | 2230 | { |
178a0557 | 2231 | int ret = 0, retval = 0; |
d3e2ba59 JD |
2232 | void *status; |
2233 | int is_root; | |
2234 | ||
178a0557 MD |
2235 | if (!uri) { |
2236 | retval = -1; | |
2237 | goto exit_init_data; | |
2238 | } | |
d3e2ba59 JD |
2239 | live_uri = uri; |
2240 | ||
d3e2ba59 JD |
2241 | /* Check if daemon is UID = 0 */ |
2242 | is_root = !getuid(); | |
2243 | ||
2244 | if (!is_root) { | |
2245 | if (live_uri->port < 1024) { | |
2246 | ERR("Need to be root to use ports < 1024"); | |
178a0557 MD |
2247 | retval = -1; |
2248 | goto exit_init_data; | |
d3e2ba59 JD |
2249 | } |
2250 | } | |
2251 | ||
2252 | /* Setup the thread apps communication pipe. */ | |
178a0557 MD |
2253 | if (create_conn_pipe()) { |
2254 | retval = -1; | |
2255 | goto exit_init_data; | |
d3e2ba59 JD |
2256 | } |
2257 | ||
2258 | /* Init relay command queue. */ | |
8bdee6e2 | 2259 | cds_wfcq_init(&viewer_conn_queue.head, &viewer_conn_queue.tail); |
d3e2ba59 JD |
2260 | |
2261 | /* Set up max poll set size */ | |
25b397f9 MD |
2262 | if (lttng_poll_set_max_size()) { |
2263 | retval = -1; | |
2264 | goto exit_init_data; | |
2265 | } | |
d3e2ba59 JD |
2266 | |
2267 | /* Setup the dispatcher thread */ | |
1a1a34b4 | 2268 | ret = pthread_create(&live_dispatcher_thread, default_pthread_attr(), |
d3e2ba59 | 2269 | thread_dispatcher, (void *) NULL); |
178a0557 MD |
2270 | if (ret) { |
2271 | errno = ret; | |
d3e2ba59 | 2272 | PERROR("pthread_create viewer dispatcher"); |
178a0557 MD |
2273 | retval = -1; |
2274 | goto exit_dispatcher_thread; | |
d3e2ba59 JD |
2275 | } |
2276 | ||
2277 | /* Setup the worker thread */ | |
1a1a34b4 | 2278 | ret = pthread_create(&live_worker_thread, default_pthread_attr(), |
7591bab1 | 2279 | thread_worker, NULL); |
178a0557 MD |
2280 | if (ret) { |
2281 | errno = ret; | |
d3e2ba59 | 2282 | PERROR("pthread_create viewer worker"); |
178a0557 MD |
2283 | retval = -1; |
2284 | goto exit_worker_thread; | |
d3e2ba59 JD |
2285 | } |
2286 | ||
2287 | /* Setup the listener thread */ | |
1a1a34b4 | 2288 | ret = pthread_create(&live_listener_thread, default_pthread_attr(), |
d3e2ba59 | 2289 | thread_listener, (void *) NULL); |
178a0557 MD |
2290 | if (ret) { |
2291 | errno = ret; | |
d3e2ba59 | 2292 | PERROR("pthread_create viewer listener"); |
178a0557 MD |
2293 | retval = -1; |
2294 | goto exit_listener_thread; | |
d3e2ba59 JD |
2295 | } |
2296 | ||
178a0557 MD |
2297 | /* |
2298 | * All OK, started all threads. | |
2299 | */ | |
2300 | return retval; | |
2301 | ||
9911d21b JG |
2302 | /* |
2303 | * Join on the live_listener_thread should anything be added after | |
2304 | * the live_listener thread's creation. | |
2305 | */ | |
d3e2ba59 | 2306 | |
178a0557 | 2307 | exit_listener_thread: |
d3e2ba59 | 2308 | |
d3e2ba59 | 2309 | ret = pthread_join(live_worker_thread, &status); |
178a0557 MD |
2310 | if (ret) { |
2311 | errno = ret; | |
d3e2ba59 | 2312 | PERROR("pthread_join live worker"); |
178a0557 | 2313 | retval = -1; |
d3e2ba59 | 2314 | } |
178a0557 | 2315 | exit_worker_thread: |
d3e2ba59 | 2316 | |
d3e2ba59 | 2317 | ret = pthread_join(live_dispatcher_thread, &status); |
178a0557 MD |
2318 | if (ret) { |
2319 | errno = ret; | |
d3e2ba59 | 2320 | PERROR("pthread_join live dispatcher"); |
178a0557 | 2321 | retval = -1; |
d3e2ba59 | 2322 | } |
178a0557 | 2323 | exit_dispatcher_thread: |
d3e2ba59 | 2324 | |
178a0557 MD |
2325 | exit_init_data: |
2326 | cleanup_relayd_live(); | |
d3e2ba59 | 2327 | |
178a0557 | 2328 | return retval; |
d3e2ba59 | 2329 | } |