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) { | |
123ed7c2 | 312 | bool trace_has_metadata_stream = false; |
2a174661 | 313 | struct relay_stream *stream; |
2f8f53af DG |
314 | |
315 | health_code_update(); | |
316 | ||
7591bab1 | 317 | if (!ctf_trace_get(ctf_trace)) { |
2f8f53af DG |
318 | continue; |
319 | } | |
320 | ||
123ed7c2 FD |
321 | /* |
322 | * Iterate over all the streams of the trace to see if we have a | |
323 | * metadata stream. | |
324 | */ | |
325 | cds_list_for_each_entry_rcu( | |
326 | stream, &ctf_trace->stream_list, stream_node) | |
327 | { | |
328 | if (stream->is_metadata) { | |
329 | trace_has_metadata_stream = true; | |
330 | break; | |
331 | } | |
332 | } | |
333 | ||
334 | /* | |
335 | * If there is no metadata stream in this trace at the moment | |
336 | * and we never sent one to the viewer, skip the trace. We | |
337 | * accept that the viewer will not see this trace at all. | |
338 | */ | |
339 | if (!trace_has_metadata_stream && | |
340 | !ctf_trace->metadata_stream_sent_to_viewer) { | |
3d7708ff JG |
341 | ctf_trace_put(ctf_trace); |
342 | continue; | |
123ed7c2 FD |
343 | } |
344 | ||
7591bab1 | 345 | cds_list_for_each_entry_rcu(stream, &ctf_trace->stream_list, stream_node) { |
2a174661 DG |
346 | struct relay_viewer_stream *vstream; |
347 | ||
7591bab1 | 348 | if (!stream_get(stream)) { |
2a174661 DG |
349 | continue; |
350 | } | |
7591bab1 | 351 | /* |
d812ecb9 | 352 | * stream published is protected by the session lock. |
7591bab1 MD |
353 | */ |
354 | if (!stream->published) { | |
355 | goto next; | |
356 | } | |
357 | vstream = viewer_stream_get_by_id(stream->stream_handle); | |
2f8f53af | 358 | if (!vstream) { |
123ed7c2 FD |
359 | /* |
360 | * Save that we sent the metadata stream to the | |
361 | * viewer. So that we know what trace the viewer | |
362 | * is aware of. | |
363 | */ | |
364 | if (stream->is_metadata) { | |
365 | ctf_trace->metadata_stream_sent_to_viewer = | |
366 | true; | |
367 | } | |
b66a15d1 JG |
368 | vstream = viewer_stream_create(stream, |
369 | viewer_trace_chunk, seek_t); | |
2a174661 DG |
370 | if (!vstream) { |
371 | ret = -1; | |
7591bab1 MD |
372 | ctf_trace_put(ctf_trace); |
373 | stream_put(stream); | |
2a174661 DG |
374 | goto error_unlock; |
375 | } | |
2a174661 DG |
376 | |
377 | if (nb_created) { | |
378 | /* Update number of created stream counter. */ | |
379 | (*nb_created)++; | |
380 | } | |
2229a09c MD |
381 | /* |
382 | * Ensure a self-reference is preserved even | |
383 | * after we have put our local reference. | |
384 | */ | |
862d3a3b MD |
385 | if (!viewer_stream_get(vstream)) { |
386 | ERR("Unable to get self-reference on viewer stream, logic error."); | |
387 | abort(); | |
388 | } | |
7591bab1 MD |
389 | } else { |
390 | if (!vstream->sent_flag && nb_unsent) { | |
391 | /* Update number of unsent stream counter. */ | |
392 | (*nb_unsent)++; | |
393 | } | |
2f8f53af | 394 | } |
2a174661 DG |
395 | /* Update number of total stream counter. */ |
396 | if (nb_total) { | |
2229a09c MD |
397 | if (stream->is_metadata) { |
398 | if (!stream->closed || | |
399 | stream->metadata_received > vstream->metadata_sent) { | |
400 | (*nb_total)++; | |
401 | } | |
402 | } else { | |
403 | if (!stream->closed || | |
a8f9f353 | 404 | !(((int64_t) (stream->prev_data_seq - stream->last_net_seq_num)) >= 0)) { |
2229a09c MD |
405 | |
406 | (*nb_total)++; | |
407 | } | |
408 | } | |
2f8f53af | 409 | } |
2229a09c MD |
410 | /* Put local reference. */ |
411 | viewer_stream_put(vstream); | |
7591bab1 MD |
412 | next: |
413 | stream_put(stream); | |
2f8f53af | 414 | } |
7591bab1 | 415 | ctf_trace_put(ctf_trace); |
2f8f53af DG |
416 | } |
417 | ||
418 | ret = 0; | |
419 | ||
420 | error_unlock: | |
2a174661 | 421 | rcu_read_unlock(); |
dbd6665b | 422 | error: |
2f8f53af DG |
423 | return ret; |
424 | } | |
425 | ||
b4aacfdc | 426 | int relayd_live_stop(void) |
d3e2ba59 | 427 | { |
b4aacfdc | 428 | /* Stop dispatch thread */ |
d3e2ba59 | 429 | CMM_STORE_SHARED(live_dispatch_thread_exit, 1); |
58eb9381 | 430 | futex_nto1_wake(&viewer_conn_queue.futex); |
b4aacfdc | 431 | return 0; |
d3e2ba59 JD |
432 | } |
433 | ||
d3e2ba59 JD |
434 | /* |
435 | * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set. | |
436 | */ | |
437 | static | |
438 | int create_thread_poll_set(struct lttng_poll_event *events, int size) | |
439 | { | |
440 | int ret; | |
441 | ||
442 | if (events == NULL || size == 0) { | |
443 | ret = -1; | |
444 | goto error; | |
445 | } | |
446 | ||
447 | ret = lttng_poll_create(events, size, LTTNG_CLOEXEC); | |
448 | if (ret < 0) { | |
449 | goto error; | |
450 | } | |
451 | ||
452 | /* Add quit pipe */ | |
bcf4a440 | 453 | ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN | LPOLLERR); |
d3e2ba59 JD |
454 | if (ret < 0) { |
455 | goto error; | |
456 | } | |
457 | ||
458 | return 0; | |
459 | ||
460 | error: | |
461 | return ret; | |
462 | } | |
463 | ||
464 | /* | |
465 | * Check if the thread quit pipe was triggered. | |
466 | * | |
467 | * Return 1 if it was triggered else 0; | |
468 | */ | |
469 | static | |
bcf4a440 | 470 | int check_thread_quit_pipe(int fd, uint32_t events) |
d3e2ba59 | 471 | { |
bcf4a440 | 472 | if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) { |
d3e2ba59 JD |
473 | return 1; |
474 | } | |
475 | ||
476 | return 0; | |
477 | } | |
478 | ||
479 | /* | |
480 | * Create and init socket from uri. | |
481 | */ | |
482 | static | |
483 | struct lttcomm_sock *init_socket(struct lttng_uri *uri) | |
484 | { | |
485 | int ret; | |
486 | struct lttcomm_sock *sock = NULL; | |
487 | ||
488 | sock = lttcomm_alloc_sock_from_uri(uri); | |
489 | if (sock == NULL) { | |
490 | ERR("Allocating socket"); | |
491 | goto error; | |
492 | } | |
493 | ||
494 | ret = lttcomm_create_sock(sock); | |
495 | if (ret < 0) { | |
496 | goto error; | |
497 | } | |
2288467f | 498 | DBG("Listening on sock %d for lttng-live", sock->fd); |
d3e2ba59 JD |
499 | |
500 | ret = sock->ops->bind(sock); | |
501 | if (ret < 0) { | |
2288467f | 502 | PERROR("Failed to bind lttng-live socket"); |
d3e2ba59 JD |
503 | goto error; |
504 | } | |
505 | ||
506 | ret = sock->ops->listen(sock, -1); | |
507 | if (ret < 0) { | |
508 | goto error; | |
509 | ||
510 | } | |
511 | ||
512 | return sock; | |
513 | ||
514 | error: | |
515 | if (sock) { | |
516 | lttcomm_destroy_sock(sock); | |
517 | } | |
518 | return NULL; | |
519 | } | |
520 | ||
521 | /* | |
522 | * This thread manages the listening for new connections on the network | |
523 | */ | |
524 | static | |
525 | void *thread_listener(void *data) | |
526 | { | |
527 | int i, ret, pollfd, err = -1; | |
d3e2ba59 JD |
528 | uint32_t revents, nb_fd; |
529 | struct lttng_poll_event events; | |
530 | struct lttcomm_sock *live_control_sock; | |
531 | ||
532 | DBG("[thread] Relay live listener started"); | |
533 | ||
eea7556c MD |
534 | health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_LISTENER); |
535 | ||
536 | health_code_update(); | |
537 | ||
d3e2ba59 JD |
538 | live_control_sock = init_socket(live_uri); |
539 | if (!live_control_sock) { | |
540 | goto error_sock_control; | |
541 | } | |
542 | ||
fb4d42ab | 543 | /* Pass 2 as size here for the thread quit pipe and control sockets. */ |
d3e2ba59 JD |
544 | ret = create_thread_poll_set(&events, 2); |
545 | if (ret < 0) { | |
546 | goto error_create_poll; | |
547 | } | |
548 | ||
549 | /* Add the control socket */ | |
550 | ret = lttng_poll_add(&events, live_control_sock->fd, LPOLLIN | LPOLLRDHUP); | |
551 | if (ret < 0) { | |
552 | goto error_poll_add; | |
553 | } | |
554 | ||
3fd27398 MD |
555 | lttng_relay_notify_ready(); |
556 | ||
9b5e0863 MD |
557 | if (testpoint(relayd_thread_live_listener)) { |
558 | goto error_testpoint; | |
559 | } | |
560 | ||
d3e2ba59 | 561 | while (1) { |
eea7556c MD |
562 | health_code_update(); |
563 | ||
d3e2ba59 JD |
564 | DBG("Listener accepting live viewers connections"); |
565 | ||
566 | restart: | |
eea7556c | 567 | health_poll_entry(); |
d3e2ba59 | 568 | ret = lttng_poll_wait(&events, -1); |
eea7556c | 569 | health_poll_exit(); |
d3e2ba59 JD |
570 | if (ret < 0) { |
571 | /* | |
572 | * Restart interrupted system call. | |
573 | */ | |
574 | if (errno == EINTR) { | |
575 | goto restart; | |
576 | } | |
577 | goto error; | |
578 | } | |
579 | nb_fd = ret; | |
580 | ||
581 | DBG("Relay new viewer connection received"); | |
582 | for (i = 0; i < nb_fd; i++) { | |
eea7556c MD |
583 | health_code_update(); |
584 | ||
d3e2ba59 JD |
585 | /* Fetch once the poll data */ |
586 | revents = LTTNG_POLL_GETEV(&events, i); | |
587 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
588 | ||
589 | /* Thread quit pipe has been closed. Killing thread. */ | |
bcf4a440 | 590 | ret = check_thread_quit_pipe(pollfd, revents); |
d3e2ba59 JD |
591 | if (ret) { |
592 | err = 0; | |
593 | goto exit; | |
594 | } | |
595 | ||
03e43155 | 596 | if (revents & LPOLLIN) { |
d3e2ba59 | 597 | /* |
7591bab1 MD |
598 | * A new connection is requested, therefore a |
599 | * viewer connection is allocated in this | |
600 | * thread, enqueued to a global queue and | |
601 | * dequeued (and freed) in the worker thread. | |
d3e2ba59 | 602 | */ |
58eb9381 DG |
603 | int val = 1; |
604 | struct relay_connection *new_conn; | |
d3e2ba59 JD |
605 | struct lttcomm_sock *newsock; |
606 | ||
d3e2ba59 JD |
607 | newsock = live_control_sock->ops->accept(live_control_sock); |
608 | if (!newsock) { | |
609 | PERROR("accepting control sock"); | |
d3e2ba59 JD |
610 | goto error; |
611 | } | |
612 | DBG("Relay viewer connection accepted socket %d", newsock->fd); | |
58eb9381 | 613 | |
d3e2ba59 | 614 | ret = setsockopt(newsock->fd, SOL_SOCKET, SO_REUSEADDR, &val, |
58eb9381 | 615 | sizeof(val)); |
d3e2ba59 JD |
616 | if (ret < 0) { |
617 | PERROR("setsockopt inet"); | |
618 | lttcomm_destroy_sock(newsock); | |
d3e2ba59 JD |
619 | goto error; |
620 | } | |
7591bab1 MD |
621 | new_conn = connection_create(newsock, RELAY_CONNECTION_UNKNOWN); |
622 | if (!new_conn) { | |
623 | lttcomm_destroy_sock(newsock); | |
624 | goto error; | |
625 | } | |
626 | /* Ownership assumed by the connection. */ | |
627 | newsock = NULL; | |
d3e2ba59 | 628 | |
58eb9381 | 629 | /* Enqueue request for the dispatcher thread. */ |
8bdee6e2 SM |
630 | cds_wfcq_enqueue(&viewer_conn_queue.head, &viewer_conn_queue.tail, |
631 | &new_conn->qnode); | |
d3e2ba59 JD |
632 | |
633 | /* | |
7591bab1 MD |
634 | * Wake the dispatch queue futex. |
635 | * Implicit memory barrier with the | |
636 | * exchange in cds_wfcq_enqueue. | |
d3e2ba59 | 637 | */ |
58eb9381 | 638 | futex_nto1_wake(&viewer_conn_queue.futex); |
03e43155 MD |
639 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
640 | ERR("socket poll error"); | |
641 | goto error; | |
642 | } else { | |
643 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
644 | goto error; | |
d3e2ba59 JD |
645 | } |
646 | } | |
647 | } | |
648 | ||
649 | exit: | |
650 | error: | |
651 | error_poll_add: | |
9b5e0863 | 652 | error_testpoint: |
d3e2ba59 JD |
653 | lttng_poll_clean(&events); |
654 | error_create_poll: | |
655 | if (live_control_sock->fd >= 0) { | |
656 | ret = live_control_sock->ops->close(live_control_sock); | |
657 | if (ret) { | |
658 | PERROR("close"); | |
659 | } | |
660 | } | |
661 | lttcomm_destroy_sock(live_control_sock); | |
662 | error_sock_control: | |
663 | if (err) { | |
eea7556c | 664 | health_error(); |
d3e2ba59 JD |
665 | DBG("Live viewer listener thread exited with error"); |
666 | } | |
eea7556c | 667 | health_unregister(health_relayd); |
d3e2ba59 | 668 | DBG("Live viewer listener thread cleanup complete"); |
b4aacfdc MD |
669 | if (lttng_relay_stop_threads()) { |
670 | ERR("Error stopping threads"); | |
178a0557 | 671 | } |
d3e2ba59 JD |
672 | return NULL; |
673 | } | |
674 | ||
675 | /* | |
676 | * This thread manages the dispatching of the requests to worker threads | |
677 | */ | |
678 | static | |
679 | void *thread_dispatcher(void *data) | |
680 | { | |
6cd525e8 MD |
681 | int err = -1; |
682 | ssize_t ret; | |
8bdee6e2 | 683 | struct cds_wfcq_node *node; |
58eb9381 | 684 | struct relay_connection *conn = NULL; |
d3e2ba59 JD |
685 | |
686 | DBG("[thread] Live viewer relay dispatcher started"); | |
687 | ||
eea7556c MD |
688 | health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_DISPATCHER); |
689 | ||
9b5e0863 MD |
690 | if (testpoint(relayd_thread_live_dispatcher)) { |
691 | goto error_testpoint; | |
692 | } | |
693 | ||
eea7556c MD |
694 | health_code_update(); |
695 | ||
0ed3b1a8 | 696 | for (;;) { |
eea7556c MD |
697 | health_code_update(); |
698 | ||
d3e2ba59 | 699 | /* Atomically prepare the queue futex */ |
58eb9381 | 700 | futex_nto1_prepare(&viewer_conn_queue.futex); |
d3e2ba59 | 701 | |
0ed3b1a8 MD |
702 | if (CMM_LOAD_SHARED(live_dispatch_thread_exit)) { |
703 | break; | |
704 | } | |
705 | ||
d3e2ba59 | 706 | do { |
eea7556c MD |
707 | health_code_update(); |
708 | ||
d3e2ba59 | 709 | /* Dequeue commands */ |
8bdee6e2 SM |
710 | node = cds_wfcq_dequeue_blocking(&viewer_conn_queue.head, |
711 | &viewer_conn_queue.tail); | |
d3e2ba59 JD |
712 | if (node == NULL) { |
713 | DBG("Woken up but nothing in the live-viewer " | |
714 | "relay command queue"); | |
715 | /* Continue thread execution */ | |
716 | break; | |
717 | } | |
58eb9381 | 718 | conn = caa_container_of(node, struct relay_connection, qnode); |
d3e2ba59 | 719 | DBG("Dispatching viewer request waiting on sock %d", |
58eb9381 | 720 | conn->sock->fd); |
d3e2ba59 JD |
721 | |
722 | /* | |
7591bab1 MD |
723 | * Inform worker thread of the new request. This |
724 | * call is blocking so we can be assured that | |
725 | * the data will be read at some point in time | |
726 | * or wait to the end of the world :) | |
d3e2ba59 | 727 | */ |
58eb9381 DG |
728 | ret = lttng_write(live_conn_pipe[1], &conn, sizeof(conn)); |
729 | if (ret < 0) { | |
730 | PERROR("write conn pipe"); | |
7591bab1 | 731 | connection_put(conn); |
d3e2ba59 JD |
732 | goto error; |
733 | } | |
734 | } while (node != NULL); | |
735 | ||
736 | /* Futex wait on queue. Blocking call on futex() */ | |
eea7556c | 737 | health_poll_entry(); |
58eb9381 | 738 | futex_nto1_wait(&viewer_conn_queue.futex); |
eea7556c | 739 | health_poll_exit(); |
d3e2ba59 JD |
740 | } |
741 | ||
eea7556c MD |
742 | /* Normal exit, no error */ |
743 | err = 0; | |
744 | ||
d3e2ba59 | 745 | error: |
9b5e0863 | 746 | error_testpoint: |
eea7556c MD |
747 | if (err) { |
748 | health_error(); | |
749 | ERR("Health error occurred in %s", __func__); | |
750 | } | |
751 | health_unregister(health_relayd); | |
d3e2ba59 | 752 | DBG("Live viewer dispatch thread dying"); |
b4aacfdc MD |
753 | if (lttng_relay_stop_threads()) { |
754 | ERR("Error stopping threads"); | |
178a0557 | 755 | } |
d3e2ba59 JD |
756 | return NULL; |
757 | } | |
758 | ||
759 | /* | |
760 | * Establish connection with the viewer and check the versions. | |
761 | * | |
762 | * Return 0 on success or else negative value. | |
763 | */ | |
764 | static | |
58eb9381 | 765 | int viewer_connect(struct relay_connection *conn) |
d3e2ba59 JD |
766 | { |
767 | int ret; | |
768 | struct lttng_viewer_connect reply, msg; | |
769 | ||
58eb9381 | 770 | conn->version_check_done = 1; |
d3e2ba59 | 771 | |
eea7556c MD |
772 | health_code_update(); |
773 | ||
2f8f53af DG |
774 | DBG("Viewer is establishing a connection to the relayd."); |
775 | ||
58eb9381 | 776 | ret = recv_request(conn->sock, &msg, sizeof(msg)); |
2f8f53af | 777 | if (ret < 0) { |
d3e2ba59 JD |
778 | goto end; |
779 | } | |
780 | ||
eea7556c MD |
781 | health_code_update(); |
782 | ||
f46b2ce6 | 783 | memset(&reply, 0, sizeof(reply)); |
d3e2ba59 JD |
784 | reply.major = RELAYD_VERSION_COMM_MAJOR; |
785 | reply.minor = RELAYD_VERSION_COMM_MINOR; | |
786 | ||
787 | /* Major versions must be the same */ | |
788 | if (reply.major != be32toh(msg.major)) { | |
2f8f53af DG |
789 | DBG("Incompatible major versions ([relayd] %u vs [client] %u)", |
790 | reply.major, be32toh(msg.major)); | |
72180669 | 791 | ret = -1; |
d3e2ba59 JD |
792 | goto end; |
793 | } | |
794 | ||
58eb9381 | 795 | conn->major = reply.major; |
d3e2ba59 JD |
796 | /* We adapt to the lowest compatible version */ |
797 | if (reply.minor <= be32toh(msg.minor)) { | |
58eb9381 | 798 | conn->minor = reply.minor; |
d3e2ba59 | 799 | } else { |
58eb9381 | 800 | conn->minor = be32toh(msg.minor); |
d3e2ba59 JD |
801 | } |
802 | ||
c4e361a4 | 803 | if (be32toh(msg.type) == LTTNG_VIEWER_CLIENT_COMMAND) { |
58eb9381 | 804 | conn->type = RELAY_VIEWER_COMMAND; |
c4e361a4 | 805 | } else if (be32toh(msg.type) == LTTNG_VIEWER_CLIENT_NOTIFICATION) { |
58eb9381 | 806 | conn->type = RELAY_VIEWER_NOTIFICATION; |
d3e2ba59 JD |
807 | } else { |
808 | ERR("Unknown connection type : %u", be32toh(msg.type)); | |
809 | ret = -1; | |
810 | goto end; | |
811 | } | |
812 | ||
813 | reply.major = htobe32(reply.major); | |
814 | reply.minor = htobe32(reply.minor); | |
58eb9381 | 815 | if (conn->type == RELAY_VIEWER_COMMAND) { |
93b4787b | 816 | /* |
7591bab1 MD |
817 | * Increment outside of htobe64 macro, because the argument can |
818 | * be used more than once within the macro, and thus the | |
819 | * operation may be undefined. | |
93b4787b | 820 | */ |
7591bab1 | 821 | pthread_mutex_lock(&last_relay_viewer_session_id_lock); |
93b4787b | 822 | last_relay_viewer_session_id++; |
7591bab1 | 823 | pthread_mutex_unlock(&last_relay_viewer_session_id_lock); |
93b4787b | 824 | reply.viewer_session_id = htobe64(last_relay_viewer_session_id); |
d3e2ba59 | 825 | } |
eea7556c MD |
826 | |
827 | health_code_update(); | |
828 | ||
58eb9381 | 829 | ret = send_response(conn->sock, &reply, sizeof(reply)); |
d3e2ba59 | 830 | if (ret < 0) { |
2f8f53af | 831 | goto end; |
d3e2ba59 JD |
832 | } |
833 | ||
eea7556c MD |
834 | health_code_update(); |
835 | ||
58eb9381 | 836 | DBG("Version check done using protocol %u.%u", conn->major, conn->minor); |
d3e2ba59 JD |
837 | ret = 0; |
838 | ||
839 | end: | |
840 | return ret; | |
841 | } | |
842 | ||
843 | /* | |
844 | * Send the viewer the list of current sessions. | |
7591bab1 MD |
845 | * We need to create a copy of the hash table content because otherwise |
846 | * we cannot assume the number of entries stays the same between getting | |
847 | * the number of HT elements and iteration over the HT. | |
d3e2ba59 JD |
848 | * |
849 | * Return 0 on success or else a negative value. | |
850 | */ | |
851 | static | |
58eb9381 | 852 | int viewer_list_sessions(struct relay_connection *conn) |
d3e2ba59 | 853 | { |
5f10c6b1 | 854 | int ret = 0; |
d3e2ba59 | 855 | struct lttng_viewer_list_sessions session_list; |
d3e2ba59 | 856 | struct lttng_ht_iter iter; |
d3e2ba59 | 857 | struct relay_session *session; |
7591bab1 MD |
858 | struct lttng_viewer_session *send_session_buf = NULL; |
859 | uint32_t buf_count = SESSION_BUF_DEFAULT_COUNT; | |
860 | uint32_t count = 0; | |
d3e2ba59 JD |
861 | |
862 | DBG("List sessions received"); | |
863 | ||
7591bab1 MD |
864 | send_session_buf = zmalloc(SESSION_BUF_DEFAULT_COUNT * sizeof(*send_session_buf)); |
865 | if (!send_session_buf) { | |
866 | return -1; | |
d3e2ba59 JD |
867 | } |
868 | ||
7591bab1 MD |
869 | rcu_read_lock(); |
870 | cds_lfht_for_each_entry(sessions_ht->ht, &iter.iter, session, | |
2f8f53af | 871 | session_n.node) { |
7591bab1 | 872 | struct lttng_viewer_session *send_session; |
d3e2ba59 | 873 | |
eea7556c MD |
874 | health_code_update(); |
875 | ||
d995f382 | 876 | pthread_mutex_lock(&session->lock); |
7e0a4379 JR |
877 | if (session->connection_closed) { |
878 | /* Skip closed session */ | |
d995f382 JG |
879 | goto next_session; |
880 | } | |
881 | if (!session->current_trace_chunk) { | |
882 | /* | |
883 | * Skip un-attachable session. It is either | |
884 | * being destroyed or has not had a trace | |
885 | * chunk created against it yet. | |
886 | */ | |
887 | goto next_session; | |
7e0a4379 JR |
888 | } |
889 | ||
7591bab1 MD |
890 | if (count >= buf_count) { |
891 | struct lttng_viewer_session *newbuf; | |
892 | uint32_t new_buf_count = buf_count << 1; | |
eea7556c | 893 | |
7591bab1 MD |
894 | newbuf = realloc(send_session_buf, |
895 | new_buf_count * sizeof(*send_session_buf)); | |
896 | if (!newbuf) { | |
897 | ret = -1; | |
d995f382 | 898 | goto break_loop; |
7591bab1 MD |
899 | } |
900 | send_session_buf = newbuf; | |
901 | buf_count = new_buf_count; | |
6763619c | 902 | } |
7591bab1 | 903 | send_session = &send_session_buf[count]; |
bfc3fb17 MD |
904 | if (lttng_strncpy(send_session->session_name, |
905 | session->session_name, | |
906 | sizeof(send_session->session_name))) { | |
907 | ret = -1; | |
d995f382 | 908 | goto break_loop; |
bfc3fb17 MD |
909 | } |
910 | if (lttng_strncpy(send_session->hostname, session->hostname, | |
911 | sizeof(send_session->hostname))) { | |
912 | ret = -1; | |
d995f382 | 913 | goto break_loop; |
bfc3fb17 | 914 | } |
7591bab1 MD |
915 | send_session->id = htobe64(session->id); |
916 | send_session->live_timer = htobe32(session->live_timer); | |
917 | if (session->viewer_attached) { | |
918 | send_session->clients = htobe32(1); | |
919 | } else { | |
920 | send_session->clients = htobe32(0); | |
d227d5bd | 921 | } |
7591bab1 MD |
922 | send_session->streams = htobe32(session->stream_count); |
923 | count++; | |
d995f382 JG |
924 | next_session: |
925 | pthread_mutex_unlock(&session->lock); | |
926 | continue; | |
927 | break_loop: | |
928 | pthread_mutex_unlock(&session->lock); | |
929 | break; | |
7591bab1 MD |
930 | } |
931 | rcu_read_unlock(); | |
5f10c6b1 JG |
932 | if (ret < 0) { |
933 | goto end_free; | |
934 | } | |
d227d5bd | 935 | |
7591bab1 | 936 | session_list.sessions_count = htobe32(count); |
d227d5bd | 937 | |
7591bab1 | 938 | health_code_update(); |
d227d5bd | 939 | |
7591bab1 MD |
940 | ret = send_response(conn->sock, &session_list, sizeof(session_list)); |
941 | if (ret < 0) { | |
942 | goto end_free; | |
d227d5bd | 943 | } |
d227d5bd | 944 | |
7591bab1 | 945 | health_code_update(); |
d227d5bd | 946 | |
7591bab1 MD |
947 | ret = send_response(conn->sock, send_session_buf, |
948 | count * sizeof(*send_session_buf)); | |
949 | if (ret < 0) { | |
950 | goto end_free; | |
d227d5bd | 951 | } |
7591bab1 | 952 | health_code_update(); |
d227d5bd | 953 | |
7591bab1 MD |
954 | ret = 0; |
955 | end_free: | |
956 | free(send_session_buf); | |
957 | return ret; | |
d227d5bd JD |
958 | } |
959 | ||
80e8027a | 960 | /* |
7591bab1 | 961 | * Send the viewer the list of current streams. |
80e8027a JD |
962 | */ |
963 | static | |
58eb9381 | 964 | int viewer_get_new_streams(struct relay_connection *conn) |
80e8027a JD |
965 | { |
966 | int ret, send_streams = 0; | |
7591bab1 | 967 | uint32_t nb_created = 0, nb_unsent = 0, nb_streams = 0, nb_total = 0; |
80e8027a JD |
968 | struct lttng_viewer_new_streams_request request; |
969 | struct lttng_viewer_new_streams_response response; | |
b66a15d1 | 970 | struct relay_session *session = NULL; |
6763619c | 971 | uint64_t session_id; |
bddf80e4 | 972 | bool closed = false; |
80e8027a | 973 | |
58eb9381 | 974 | assert(conn); |
80e8027a JD |
975 | |
976 | DBG("Get new streams received"); | |
977 | ||
80e8027a JD |
978 | health_code_update(); |
979 | ||
2f8f53af | 980 | /* Receive the request from the connected client. */ |
58eb9381 | 981 | ret = recv_request(conn->sock, &request, sizeof(request)); |
2f8f53af | 982 | if (ret < 0) { |
80e8027a JD |
983 | goto error; |
984 | } | |
6763619c | 985 | session_id = be64toh(request.session_id); |
80e8027a JD |
986 | |
987 | health_code_update(); | |
988 | ||
53efb85a MD |
989 | memset(&response, 0, sizeof(response)); |
990 | ||
7591bab1 | 991 | session = session_get_by_id(session_id); |
2f8f53af | 992 | if (!session) { |
6763619c | 993 | DBG("Relay session %" PRIu64 " not found", session_id); |
c4e361a4 | 994 | response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_ERR); |
80e8027a JD |
995 | goto send_reply; |
996 | } | |
997 | ||
7591bab1 | 998 | if (!viewer_session_is_attached(conn->viewer_session, session)) { |
c4e361a4 | 999 | response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_ERR); |
80e8027a JD |
1000 | goto send_reply; |
1001 | } | |
1002 | ||
c06fdd95 | 1003 | pthread_mutex_lock(&session->lock); |
b66a15d1 JG |
1004 | ret = make_viewer_streams(session, |
1005 | conn->viewer_session->current_trace_chunk, | |
1006 | LTTNG_VIEWER_SEEK_LAST, &nb_total, &nb_unsent, | |
bddf80e4 | 1007 | &nb_created, &closed); |
2f8f53af | 1008 | if (ret < 0) { |
b66a15d1 | 1009 | goto error_unlock_session; |
2f8f53af | 1010 | } |
3d0bbd40 JG |
1011 | send_streams = 1; |
1012 | response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_OK); | |
b66a15d1 | 1013 | |
2f8f53af DG |
1014 | /* Only send back the newly created streams with the unsent ones. */ |
1015 | nb_streams = nb_created + nb_unsent; | |
80e8027a JD |
1016 | response.streams_count = htobe32(nb_streams); |
1017 | ||
4479f682 | 1018 | /* |
2229a09c MD |
1019 | * If the session is closed, HUP when there are no more streams |
1020 | * with data. | |
4479f682 | 1021 | */ |
bddf80e4 | 1022 | if (closed && nb_total == 0) { |
4479f682 | 1023 | send_streams = 0; |
bddf80e4 | 1024 | response.streams_count = 0; |
4479f682 | 1025 | response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_HUP); |
3d0bbd40 | 1026 | goto send_reply_unlock; |
4479f682 | 1027 | } |
3d0bbd40 JG |
1028 | send_reply_unlock: |
1029 | pthread_mutex_unlock(&session->lock); | |
4479f682 | 1030 | |
80e8027a JD |
1031 | send_reply: |
1032 | health_code_update(); | |
58eb9381 | 1033 | ret = send_response(conn->sock, &response, sizeof(response)); |
80e8027a | 1034 | if (ret < 0) { |
7591bab1 | 1035 | goto end_put_session; |
80e8027a JD |
1036 | } |
1037 | health_code_update(); | |
1038 | ||
1039 | /* | |
7591bab1 MD |
1040 | * Unknown or empty session, just return gracefully, the viewer |
1041 | * knows what is happening. | |
80e8027a JD |
1042 | */ |
1043 | if (!send_streams || !nb_streams) { | |
1044 | ret = 0; | |
7591bab1 | 1045 | goto end_put_session; |
80e8027a JD |
1046 | } |
1047 | ||
2f8f53af | 1048 | /* |
7591bab1 MD |
1049 | * Send stream and *DON'T* ignore the sent flag so every viewer |
1050 | * streams that were not sent from that point will be sent to | |
1051 | * the viewer. | |
2f8f53af | 1052 | */ |
c06fdd95 | 1053 | ret = send_viewer_streams(conn->sock, session_id, 0); |
2f8f53af | 1054 | if (ret < 0) { |
7591bab1 | 1055 | goto end_put_session; |
80e8027a JD |
1056 | } |
1057 | ||
7591bab1 MD |
1058 | end_put_session: |
1059 | if (session) { | |
1060 | session_put(session); | |
1061 | } | |
80e8027a JD |
1062 | error: |
1063 | return ret; | |
b66a15d1 JG |
1064 | error_unlock_session: |
1065 | pthread_mutex_unlock(&session->lock); | |
1066 | session_put(session); | |
1067 | return ret; | |
80e8027a JD |
1068 | } |
1069 | ||
d3e2ba59 JD |
1070 | /* |
1071 | * Send the viewer the list of current sessions. | |
1072 | */ | |
1073 | static | |
58eb9381 | 1074 | int viewer_attach_session(struct relay_connection *conn) |
d3e2ba59 | 1075 | { |
2f8f53af DG |
1076 | int send_streams = 0; |
1077 | ssize_t ret; | |
80e8027a | 1078 | uint32_t nb_streams = 0; |
2f8f53af | 1079 | enum lttng_viewer_seek seek_type; |
d3e2ba59 JD |
1080 | struct lttng_viewer_attach_session_request request; |
1081 | struct lttng_viewer_attach_session_response response; | |
7591bab1 | 1082 | struct relay_session *session = NULL; |
dbd6665b | 1083 | enum lttng_viewer_attach_return_code viewer_attach_status; |
bddf80e4 | 1084 | bool closed = false; |
c06fdd95 | 1085 | uint64_t session_id; |
d3e2ba59 | 1086 | |
58eb9381 | 1087 | assert(conn); |
d3e2ba59 | 1088 | |
eea7556c MD |
1089 | health_code_update(); |
1090 | ||
2f8f53af | 1091 | /* Receive the request from the connected client. */ |
58eb9381 | 1092 | ret = recv_request(conn->sock, &request, sizeof(request)); |
2f8f53af | 1093 | if (ret < 0) { |
d3e2ba59 JD |
1094 | goto error; |
1095 | } | |
1096 | ||
c06fdd95 | 1097 | session_id = be64toh(request.session_id); |
eea7556c MD |
1098 | health_code_update(); |
1099 | ||
53efb85a MD |
1100 | memset(&response, 0, sizeof(response)); |
1101 | ||
c3b7390b JD |
1102 | if (!conn->viewer_session) { |
1103 | DBG("Client trying to attach before creating a live viewer session"); | |
1104 | response.status = htobe32(LTTNG_VIEWER_ATTACH_NO_SESSION); | |
1105 | goto send_reply; | |
1106 | } | |
1107 | ||
c06fdd95 | 1108 | session = session_get_by_id(session_id); |
2f8f53af | 1109 | if (!session) { |
c06fdd95 | 1110 | DBG("Relay session %" PRIu64 " not found", session_id); |
c4e361a4 | 1111 | response.status = htobe32(LTTNG_VIEWER_ATTACH_UNK); |
d3e2ba59 JD |
1112 | goto send_reply; |
1113 | } | |
c06fdd95 | 1114 | DBG("Attach session ID %" PRIu64 " received", session_id); |
d3e2ba59 | 1115 | |
c06fdd95 | 1116 | pthread_mutex_lock(&session->lock); |
79a42980 JG |
1117 | if (!session->current_trace_chunk) { |
1118 | /* | |
1119 | * Session is either being destroyed or it never had a trace | |
1120 | * chunk created against it. | |
1121 | */ | |
1122 | DBG("Session requested by live client has no current trace chunk, returning unknown session"); | |
1123 | response.status = htobe32(LTTNG_VIEWER_ATTACH_UNK); | |
1124 | goto send_reply; | |
1125 | } | |
7591bab1 | 1126 | if (session->live_timer == 0) { |
d3e2ba59 | 1127 | DBG("Not live session"); |
c4e361a4 | 1128 | response.status = htobe32(LTTNG_VIEWER_ATTACH_NOT_LIVE); |
d3e2ba59 | 1129 | goto send_reply; |
7591bab1 MD |
1130 | } |
1131 | ||
1132 | send_streams = 1; | |
dbd6665b JG |
1133 | viewer_attach_status = viewer_session_attach(conn->viewer_session, |
1134 | session); | |
1135 | if (viewer_attach_status != LTTNG_VIEWER_ATTACH_OK) { | |
1136 | response.status = htobe32(viewer_attach_status); | |
7591bab1 | 1137 | goto send_reply; |
d3e2ba59 JD |
1138 | } |
1139 | ||
1140 | switch (be32toh(request.seek)) { | |
c4e361a4 JD |
1141 | case LTTNG_VIEWER_SEEK_BEGINNING: |
1142 | case LTTNG_VIEWER_SEEK_LAST: | |
7591bab1 | 1143 | response.status = htobe32(LTTNG_VIEWER_ATTACH_OK); |
2f8f53af | 1144 | seek_type = be32toh(request.seek); |
d3e2ba59 JD |
1145 | break; |
1146 | default: | |
1147 | ERR("Wrong seek parameter"); | |
c4e361a4 | 1148 | response.status = htobe32(LTTNG_VIEWER_ATTACH_SEEK_ERR); |
d3e2ba59 JD |
1149 | send_streams = 0; |
1150 | goto send_reply; | |
1151 | } | |
1152 | ||
b66a15d1 JG |
1153 | ret = make_viewer_streams(session, |
1154 | conn->viewer_session->current_trace_chunk, seek_type, | |
1155 | &nb_streams, NULL, NULL, &closed); | |
2f8f53af | 1156 | if (ret < 0) { |
7591bab1 | 1157 | goto end_put_session; |
d3e2ba59 | 1158 | } |
c06fdd95 JG |
1159 | pthread_mutex_unlock(&session->lock); |
1160 | session_put(session); | |
1161 | session = NULL; | |
1162 | ||
1163 | response.streams_count = htobe32(nb_streams); | |
bddf80e4 MD |
1164 | /* |
1165 | * If the session is closed when the viewer is attaching, it | |
1166 | * means some of the streams may have been concurrently removed, | |
1167 | * so we don't allow the viewer to attach, even if there are | |
1168 | * streams available. | |
1169 | */ | |
1170 | if (closed) { | |
1171 | send_streams = 0; | |
1172 | response.streams_count = 0; | |
06079f15 | 1173 | response.status = htobe32(LTTNG_VIEWER_ATTACH_UNK); |
bddf80e4 MD |
1174 | goto send_reply; |
1175 | } | |
1176 | ||
d3e2ba59 | 1177 | send_reply: |
eea7556c | 1178 | health_code_update(); |
58eb9381 | 1179 | ret = send_response(conn->sock, &response, sizeof(response)); |
d3e2ba59 | 1180 | if (ret < 0) { |
7591bab1 | 1181 | goto end_put_session; |
d3e2ba59 | 1182 | } |
eea7556c | 1183 | health_code_update(); |
d3e2ba59 JD |
1184 | |
1185 | /* | |
7591bab1 MD |
1186 | * Unknown or empty session, just return gracefully, the viewer |
1187 | * knows what is happening. | |
d3e2ba59 | 1188 | */ |
157df586 | 1189 | if (!send_streams || !nb_streams) { |
d3e2ba59 | 1190 | ret = 0; |
7591bab1 | 1191 | goto end_put_session; |
d3e2ba59 JD |
1192 | } |
1193 | ||
2f8f53af | 1194 | /* Send stream and ignore the sent flag. */ |
c06fdd95 | 1195 | ret = send_viewer_streams(conn->sock, session_id, 1); |
2f8f53af | 1196 | if (ret < 0) { |
7591bab1 | 1197 | goto end_put_session; |
d3e2ba59 | 1198 | } |
d3e2ba59 | 1199 | |
7591bab1 MD |
1200 | end_put_session: |
1201 | if (session) { | |
c06fdd95 | 1202 | pthread_mutex_unlock(&session->lock); |
7591bab1 MD |
1203 | session_put(session); |
1204 | } | |
4a9daf17 JD |
1205 | error: |
1206 | return ret; | |
1207 | } | |
1208 | ||
878c34cf DG |
1209 | /* |
1210 | * Open the index file if needed for the given vstream. | |
1211 | * | |
f8f3885c MD |
1212 | * If an index file is successfully opened, the vstream will set it as its |
1213 | * current index file. | |
878c34cf DG |
1214 | * |
1215 | * Return 0 on success, a negative value on error (-ENOENT if not ready yet). | |
7591bab1 MD |
1216 | * |
1217 | * Called with rstream lock held. | |
878c34cf DG |
1218 | */ |
1219 | static int try_open_index(struct relay_viewer_stream *vstream, | |
1220 | struct relay_stream *rstream) | |
1221 | { | |
1222 | int ret = 0; | |
ebb29c10 JG |
1223 | const uint32_t connection_major = rstream->trace->session->major; |
1224 | const uint32_t connection_minor = rstream->trace->session->minor; | |
878c34cf | 1225 | |
f8f3885c | 1226 | if (vstream->index_file) { |
878c34cf DG |
1227 | goto end; |
1228 | } | |
1229 | ||
1230 | /* | |
7591bab1 | 1231 | * First time, we open the index file and at least one index is ready. |
878c34cf | 1232 | */ |
a44ca2ca | 1233 | if (rstream->index_received_seqcount == 0) { |
878c34cf DG |
1234 | ret = -ENOENT; |
1235 | goto end; | |
1236 | } | |
ebb29c10 | 1237 | vstream->index_file = lttng_index_file_create_from_trace_chunk_read_only( |
b66a15d1 | 1238 | vstream->stream_file.trace_chunk, rstream->path_name, |
ebb29c10 JG |
1239 | rstream->channel_name, rstream->tracefile_size, |
1240 | vstream->current_tracefile_id, | |
1241 | lttng_to_index_major(connection_major, connection_minor), | |
1242 | lttng_to_index_minor(connection_major, connection_minor)); | |
f8f3885c MD |
1243 | if (!vstream->index_file) { |
1244 | ret = -1; | |
878c34cf DG |
1245 | } |
1246 | ||
1247 | end: | |
1248 | return ret; | |
1249 | } | |
1250 | ||
1251 | /* | |
7591bab1 MD |
1252 | * Check the status of the index for the given stream. This function |
1253 | * updates the index structure if needed and can put (close) the vstream | |
1254 | * in the HUP situation. | |
1255 | * | |
1256 | * Return 0 means that we can proceed with the index. A value of 1 means | |
1257 | * that the index has been updated and is ready to be sent to the | |
1258 | * client. A negative value indicates an error that can't be handled. | |
878c34cf | 1259 | * |
7591bab1 | 1260 | * Called with rstream lock held. |
878c34cf DG |
1261 | */ |
1262 | static int check_index_status(struct relay_viewer_stream *vstream, | |
1263 | struct relay_stream *rstream, struct ctf_trace *trace, | |
1264 | struct lttng_viewer_index *index) | |
1265 | { | |
1266 | int ret; | |
1267 | ||
797bc362 | 1268 | if ((trace->session->connection_closed || rstream->closed) |
a44ca2ca MD |
1269 | && rstream->index_received_seqcount |
1270 | == vstream->index_sent_seqcount) { | |
797bc362 MD |
1271 | /* |
1272 | * Last index sent and session connection or relay | |
1273 | * stream are closed. | |
1274 | */ | |
7591bab1 MD |
1275 | index->status = htobe32(LTTNG_VIEWER_INDEX_HUP); |
1276 | goto hup; | |
1277 | } else if (rstream->beacon_ts_end != -1ULL && | |
a44ca2ca MD |
1278 | rstream->index_received_seqcount |
1279 | == vstream->index_sent_seqcount) { | |
7591bab1 MD |
1280 | /* |
1281 | * We've received a synchronization beacon and the last index | |
1282 | * available has been sent, the index for now is inactive. | |
1283 | * | |
1284 | * In this case, we have received a beacon which allows us to | |
1285 | * inform the client of a time interval during which we can | |
1286 | * guarantee that there are no events to read (and never will | |
1287 | * be). | |
1288 | */ | |
1289 | index->status = htobe32(LTTNG_VIEWER_INDEX_INACTIVE); | |
1290 | index->timestamp_end = htobe64(rstream->beacon_ts_end); | |
1291 | index->stream_id = htobe64(rstream->ctf_stream_id); | |
1292 | goto index_ready; | |
a44ca2ca MD |
1293 | } else if (rstream->index_received_seqcount |
1294 | == vstream->index_sent_seqcount) { | |
7591bab1 | 1295 | /* |
a44ca2ca MD |
1296 | * This checks whether received == sent seqcount. In |
1297 | * this case, we have not received a beacon. Therefore, | |
1298 | * we can only ask the client to retry later. | |
7591bab1 MD |
1299 | */ |
1300 | index->status = htobe32(LTTNG_VIEWER_INDEX_RETRY); | |
1301 | goto index_ready; | |
a44ca2ca MD |
1302 | } else if (!tracefile_array_seq_in_file(rstream->tfa, |
1303 | vstream->current_tracefile_id, | |
1304 | vstream->index_sent_seqcount)) { | |
7591bab1 | 1305 | /* |
a44ca2ca MD |
1306 | * The next index we want to send cannot be read either |
1307 | * because we need to perform a rotation, or due to | |
1308 | * the producer having overwritten its trace file. | |
7591bab1 | 1309 | */ |
a44ca2ca | 1310 | DBG("Viewer stream %" PRIu64 " rotation", |
7591bab1 MD |
1311 | vstream->stream->stream_handle); |
1312 | ret = viewer_stream_rotate(vstream); | |
1313 | if (ret < 0) { | |
1314 | goto end; | |
1315 | } else if (ret == 1) { | |
1316 | /* EOF across entire stream. */ | |
1317 | index->status = htobe32(LTTNG_VIEWER_INDEX_HUP); | |
1318 | goto hup; | |
1319 | } | |
7591bab1 | 1320 | /* |
a44ca2ca MD |
1321 | * If we have been pushed due to overwrite, it |
1322 | * necessarily means there is data that can be read in | |
1323 | * the stream. If we rotated because we reached the end | |
1324 | * of a tracefile, it means the following tracefile | |
1325 | * needs to contain at least one index, else we would | |
1326 | * have already returned LTTNG_VIEWER_INDEX_RETRY to the | |
1327 | * viewer. The updated index_sent_seqcount needs to | |
1328 | * point to a readable index entry now. | |
1329 | * | |
1330 | * In the case where we "rotate" on a single file, we | |
1331 | * can end up in a case where the requested index is | |
1332 | * still unavailable. | |
7591bab1 | 1333 | */ |
a44ca2ca MD |
1334 | if (rstream->tracefile_count == 1 && |
1335 | !tracefile_array_seq_in_file( | |
1336 | rstream->tfa, | |
1337 | vstream->current_tracefile_id, | |
1338 | vstream->index_sent_seqcount)) { | |
1339 | index->status = htobe32(LTTNG_VIEWER_INDEX_RETRY); | |
1340 | goto index_ready; | |
878c34cf | 1341 | } |
a44ca2ca MD |
1342 | assert(tracefile_array_seq_in_file(rstream->tfa, |
1343 | vstream->current_tracefile_id, | |
1344 | vstream->index_sent_seqcount)); | |
878c34cf | 1345 | } |
a44ca2ca MD |
1346 | /* ret == 0 means successful so we continue. */ |
1347 | ret = 0; | |
7591bab1 | 1348 | end: |
878c34cf DG |
1349 | return ret; |
1350 | ||
1351 | hup: | |
7591bab1 | 1352 | viewer_stream_put(vstream); |
878c34cf DG |
1353 | index_ready: |
1354 | return 1; | |
1355 | } | |
1356 | ||
d3e2ba59 JD |
1357 | /* |
1358 | * Send the next index for a stream. | |
1359 | * | |
1360 | * Return 0 on success or else a negative value. | |
1361 | */ | |
1362 | static | |
58eb9381 | 1363 | int viewer_get_next_index(struct relay_connection *conn) |
d3e2ba59 JD |
1364 | { |
1365 | int ret; | |
1366 | struct lttng_viewer_get_next_index request_index; | |
1367 | struct lttng_viewer_index viewer_index; | |
50adc264 | 1368 | struct ctf_packet_index packet_index; |
7591bab1 MD |
1369 | struct relay_viewer_stream *vstream = NULL; |
1370 | struct relay_stream *rstream = NULL; | |
1371 | struct ctf_trace *ctf_trace = NULL; | |
1372 | struct relay_viewer_stream *metadata_viewer_stream = NULL; | |
d3e2ba59 | 1373 | |
58eb9381 | 1374 | assert(conn); |
d3e2ba59 JD |
1375 | |
1376 | DBG("Viewer get next index"); | |
1377 | ||
7591bab1 | 1378 | memset(&viewer_index, 0, sizeof(viewer_index)); |
eea7556c | 1379 | health_code_update(); |
2f8f53af | 1380 | |
58eb9381 | 1381 | ret = recv_request(conn->sock, &request_index, sizeof(request_index)); |
2f8f53af | 1382 | if (ret < 0) { |
d3e2ba59 JD |
1383 | goto end; |
1384 | } | |
eea7556c | 1385 | health_code_update(); |
d3e2ba59 | 1386 | |
7591bab1 | 1387 | vstream = viewer_stream_get_by_id(be64toh(request_index.stream_id)); |
6763619c | 1388 | if (!vstream) { |
a44ca2ca | 1389 | DBG("Client requested index of unknown stream id %" PRIu64, |
9b9f9f94 | 1390 | (uint64_t) be64toh(request_index.stream_id)); |
f1883937 MD |
1391 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR); |
1392 | goto send_reply; | |
2a174661 DG |
1393 | } |
1394 | ||
7591bab1 MD |
1395 | /* Use back. ref. Protected by refcounts. */ |
1396 | rstream = vstream->stream; | |
1397 | ctf_trace = rstream->trace; | |
d3e2ba59 | 1398 | |
7591bab1 MD |
1399 | /* metadata_viewer_stream may be NULL. */ |
1400 | metadata_viewer_stream = | |
1401 | ctf_trace_get_viewer_metadata_stream(ctf_trace); | |
2a174661 | 1402 | |
7591bab1 | 1403 | pthread_mutex_lock(&rstream->lock); |
d3e2ba59 JD |
1404 | |
1405 | /* | |
1406 | * The viewer should not ask for index on metadata stream. | |
1407 | */ | |
7591bab1 | 1408 | if (rstream->is_metadata) { |
c4e361a4 | 1409 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_HUP); |
d3e2ba59 JD |
1410 | goto send_reply; |
1411 | } | |
1412 | ||
878c34cf DG |
1413 | /* Try to open an index if one is needed for that stream. */ |
1414 | ret = try_open_index(vstream, rstream); | |
1415 | if (ret < 0) { | |
0e6830aa | 1416 | if (ret == -ENOENT) { |
d3e2ba59 | 1417 | /* |
7591bab1 MD |
1418 | * The index is created only when the first data |
1419 | * packet arrives, it might not be ready at the | |
1420 | * beginning of the session | |
d3e2ba59 | 1421 | */ |
c4e361a4 | 1422 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_RETRY); |
878c34cf DG |
1423 | } else { |
1424 | /* Unhandled error. */ | |
c4e361a4 | 1425 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR); |
d3e2ba59 | 1426 | } |
878c34cf | 1427 | goto send_reply; |
d3e2ba59 JD |
1428 | } |
1429 | ||
878c34cf | 1430 | ret = check_index_status(vstream, rstream, ctf_trace, &viewer_index); |
878c34cf | 1431 | if (ret < 0) { |
7591bab1 | 1432 | goto error_put; |
878c34cf DG |
1433 | } else if (ret == 1) { |
1434 | /* | |
7591bab1 MD |
1435 | * We have no index to send and check_index_status has populated |
1436 | * viewer_index's status. | |
878c34cf | 1437 | */ |
d3e2ba59 JD |
1438 | goto send_reply; |
1439 | } | |
7591bab1 | 1440 | /* At this point, ret is 0 thus we will be able to read the index. */ |
878c34cf | 1441 | assert(!ret); |
d3e2ba59 | 1442 | |
7591bab1 MD |
1443 | /* |
1444 | * vstream->stream_fd may be NULL if it has been closed by | |
1445 | * tracefile rotation, or if we are at the beginning of the | |
1446 | * stream. We open the data stream file here to protect against | |
1447 | * overwrite caused by tracefile rotation (in association with | |
1448 | * unlink performed before overwrite). | |
1449 | */ | |
ebb29c10 JG |
1450 | if (!vstream->stream_file.fd) { |
1451 | int fd; | |
1452 | char file_path[LTTNG_PATH_MAX]; | |
1453 | enum lttng_trace_chunk_status status; | |
1454 | ||
1455 | ret = utils_stream_file_path(rstream->path_name, | |
1456 | rstream->channel_name, rstream->tracefile_size, | |
1457 | vstream->current_tracefile_id, NULL, file_path, | |
1458 | sizeof(file_path)); | |
7591bab1 MD |
1459 | if (ret < 0) { |
1460 | goto error_put; | |
1461 | } | |
ebb29c10 JG |
1462 | |
1463 | status = lttng_trace_chunk_open_file( | |
1464 | vstream->stream_file.trace_chunk, | |
1465 | file_path, O_RDONLY, 0, &fd); | |
1466 | if (status != LTTNG_TRACE_CHUNK_STATUS_OK) { | |
1467 | PERROR("Failed to open trace file for viewer stream"); | |
7591bab1 MD |
1468 | goto error_put; |
1469 | } | |
ebb29c10 JG |
1470 | vstream->stream_file.fd = stream_fd_create(fd); |
1471 | if (!vstream->stream_file.fd) { | |
1472 | if (close(fd)) { | |
1473 | PERROR("Failed to close viewer stream file"); | |
7591bab1 MD |
1474 | } |
1475 | goto error_put; | |
1476 | } | |
d3e2ba59 JD |
1477 | } |
1478 | ||
f04a971b | 1479 | ret = check_new_streams(conn); |
4a9daf17 | 1480 | if (ret < 0) { |
7591bab1 MD |
1481 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR); |
1482 | goto send_reply; | |
4a9daf17 JD |
1483 | } else if (ret == 1) { |
1484 | viewer_index.flags |= LTTNG_VIEWER_FLAG_NEW_STREAM; | |
1485 | } | |
1486 | ||
f8f3885c MD |
1487 | ret = lttng_index_file_read(vstream->index_file, &packet_index); |
1488 | if (ret) { | |
1489 | ERR("Relay error reading index file %d", | |
1490 | vstream->index_file->fd); | |
7591bab1 | 1491 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR); |
6b6b9a5a | 1492 | goto send_reply; |
d3e2ba59 | 1493 | } else { |
c4e361a4 | 1494 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_OK); |
a44ca2ca | 1495 | vstream->index_sent_seqcount++; |
d3e2ba59 JD |
1496 | } |
1497 | ||
1498 | /* | |
1499 | * Indexes are stored in big endian, no need to switch before sending. | |
1500 | */ | |
7591bab1 MD |
1501 | DBG("Sending viewer index for stream %" PRIu64 " offset %" PRIu64, |
1502 | rstream->stream_handle, | |
9b9f9f94 | 1503 | (uint64_t) be64toh(packet_index.offset)); |
d3e2ba59 JD |
1504 | viewer_index.offset = packet_index.offset; |
1505 | viewer_index.packet_size = packet_index.packet_size; | |
1506 | viewer_index.content_size = packet_index.content_size; | |
1507 | viewer_index.timestamp_begin = packet_index.timestamp_begin; | |
1508 | viewer_index.timestamp_end = packet_index.timestamp_end; | |
1509 | viewer_index.events_discarded = packet_index.events_discarded; | |
1510 | viewer_index.stream_id = packet_index.stream_id; | |
1511 | ||
1512 | send_reply: | |
f1883937 MD |
1513 | if (rstream) { |
1514 | pthread_mutex_unlock(&rstream->lock); | |
1515 | } | |
7591bab1 MD |
1516 | |
1517 | if (metadata_viewer_stream) { | |
1518 | pthread_mutex_lock(&metadata_viewer_stream->stream->lock); | |
1519 | DBG("get next index metadata check: recv %" PRIu64 | |
1520 | " sent %" PRIu64, | |
1521 | metadata_viewer_stream->stream->metadata_received, | |
1522 | metadata_viewer_stream->metadata_sent); | |
1523 | if (!metadata_viewer_stream->stream->metadata_received || | |
1524 | metadata_viewer_stream->stream->metadata_received > | |
1525 | metadata_viewer_stream->metadata_sent) { | |
1526 | viewer_index.flags |= LTTNG_VIEWER_FLAG_NEW_METADATA; | |
1527 | } | |
1528 | pthread_mutex_unlock(&metadata_viewer_stream->stream->lock); | |
1529 | } | |
1530 | ||
d3e2ba59 | 1531 | viewer_index.flags = htobe32(viewer_index.flags); |
eea7556c | 1532 | health_code_update(); |
2f8f53af | 1533 | |
58eb9381 | 1534 | ret = send_response(conn->sock, &viewer_index, sizeof(viewer_index)); |
d3e2ba59 | 1535 | if (ret < 0) { |
7591bab1 | 1536 | goto end; |
d3e2ba59 | 1537 | } |
eea7556c | 1538 | health_code_update(); |
d3e2ba59 | 1539 | |
9237e6a1 MD |
1540 | if (vstream) { |
1541 | DBG("Index %" PRIu64 " for stream %" PRIu64 " sent", | |
a44ca2ca | 1542 | vstream->index_sent_seqcount, |
9237e6a1 MD |
1543 | vstream->stream->stream_handle); |
1544 | } | |
d3e2ba59 | 1545 | end: |
7591bab1 MD |
1546 | if (metadata_viewer_stream) { |
1547 | viewer_stream_put(metadata_viewer_stream); | |
1548 | } | |
1549 | if (vstream) { | |
1550 | viewer_stream_put(vstream); | |
1551 | } | |
1552 | return ret; | |
1553 | ||
1554 | error_put: | |
1555 | pthread_mutex_unlock(&rstream->lock); | |
1556 | if (metadata_viewer_stream) { | |
1557 | viewer_stream_put(metadata_viewer_stream); | |
1558 | } | |
1559 | viewer_stream_put(vstream); | |
d3e2ba59 JD |
1560 | return ret; |
1561 | } | |
1562 | ||
1563 | /* | |
1564 | * Send the next index for a stream | |
1565 | * | |
1566 | * Return 0 on success or else a negative value. | |
1567 | */ | |
1568 | static | |
58eb9381 | 1569 | int viewer_get_packet(struct relay_connection *conn) |
d3e2ba59 | 1570 | { |
b6025e94 | 1571 | int ret; |
a5df8828 | 1572 | off_t lseek_ret; |
553b2adb | 1573 | char *reply = NULL; |
d3e2ba59 | 1574 | struct lttng_viewer_get_packet get_packet_info; |
553b2adb | 1575 | struct lttng_viewer_trace_packet reply_header; |
7591bab1 | 1576 | struct relay_viewer_stream *vstream = NULL; |
553b2adb | 1577 | uint32_t reply_size = sizeof(reply_header); |
b6025e94 JR |
1578 | uint32_t packet_data_len = 0; |
1579 | ssize_t read_len; | |
d3e2ba59 JD |
1580 | |
1581 | DBG2("Relay get data packet"); | |
1582 | ||
eea7556c | 1583 | health_code_update(); |
2f8f53af | 1584 | |
7591bab1 MD |
1585 | ret = recv_request(conn->sock, &get_packet_info, |
1586 | sizeof(get_packet_info)); | |
2f8f53af | 1587 | if (ret < 0) { |
d3e2ba59 JD |
1588 | goto end; |
1589 | } | |
eea7556c | 1590 | health_code_update(); |
d3e2ba59 | 1591 | |
0233a6a5 | 1592 | /* From this point on, the error label can be reached. */ |
553b2adb | 1593 | memset(&reply_header, 0, sizeof(reply_header)); |
0233a6a5 | 1594 | |
7591bab1 MD |
1595 | vstream = viewer_stream_get_by_id(be64toh(get_packet_info.stream_id)); |
1596 | if (!vstream) { | |
a44ca2ca | 1597 | DBG("Client requested packet of unknown stream id %" PRIu64, |
9b9f9f94 | 1598 | (uint64_t) be64toh(get_packet_info.stream_id)); |
553b2adb JG |
1599 | reply_header.status = htobe32(LTTNG_VIEWER_GET_PACKET_ERR); |
1600 | goto send_reply_nolock; | |
b6025e94 JR |
1601 | } else { |
1602 | packet_data_len = be32toh(get_packet_info.len); | |
553b2adb | 1603 | reply_size += packet_data_len; |
d3e2ba59 | 1604 | } |
2a174661 | 1605 | |
553b2adb JG |
1606 | reply = zmalloc(reply_size); |
1607 | if (!reply) { | |
1608 | PERROR("packet reply zmalloc"); | |
1609 | reply_size = sizeof(reply_header); | |
d3e2ba59 JD |
1610 | goto error; |
1611 | } | |
1612 | ||
b6025e94 | 1613 | pthread_mutex_lock(&vstream->stream->lock); |
ebb29c10 JG |
1614 | lseek_ret = lseek(vstream->stream_file.fd->fd, |
1615 | be64toh(get_packet_info.offset), SEEK_SET); | |
a5df8828 | 1616 | if (lseek_ret < 0) { |
ebb29c10 JG |
1617 | PERROR("lseek fd %d to offset %" PRIu64, |
1618 | vstream->stream_file.fd->fd, | |
1619 | (uint64_t) be64toh(get_packet_info.offset)); | |
7591bab1 | 1620 | goto error; |
d3e2ba59 | 1621 | } |
ebb29c10 JG |
1622 | read_len = lttng_read(vstream->stream_file.fd->fd, |
1623 | reply + sizeof(reply_header), packet_data_len); | |
b6025e94 | 1624 | if (read_len < packet_data_len) { |
7591bab1 | 1625 | PERROR("Relay reading trace file, fd: %d, offset: %" PRIu64, |
ebb29c10 | 1626 | vstream->stream_file.fd->fd, |
9b9f9f94 | 1627 | (uint64_t) be64toh(get_packet_info.offset)); |
7591bab1 | 1628 | goto error; |
d3e2ba59 | 1629 | } |
553b2adb JG |
1630 | reply_header.status = htobe32(LTTNG_VIEWER_GET_PACKET_OK); |
1631 | reply_header.len = htobe32(packet_data_len); | |
d3e2ba59 JD |
1632 | goto send_reply; |
1633 | ||
1634 | error: | |
553b2adb | 1635 | reply_header.status = htobe32(LTTNG_VIEWER_GET_PACKET_ERR); |
d3e2ba59 JD |
1636 | |
1637 | send_reply: | |
7591bab1 MD |
1638 | if (vstream) { |
1639 | pthread_mutex_unlock(&vstream->stream->lock); | |
1640 | } | |
1641 | send_reply_nolock: | |
eea7556c MD |
1642 | |
1643 | health_code_update(); | |
2f8f53af | 1644 | |
553b2adb JG |
1645 | if (reply) { |
1646 | memcpy(reply, &reply_header, sizeof(reply_header)); | |
1647 | ret = send_response(conn->sock, reply, reply_size); | |
1648 | } else { | |
1649 | /* No reply to send. */ | |
1650 | ret = send_response(conn->sock, &reply_header, | |
1651 | reply_size); | |
1652 | } | |
1653 | ||
b6025e94 | 1654 | health_code_update(); |
d3e2ba59 | 1655 | if (ret < 0) { |
b6025e94 | 1656 | PERROR("sendmsg of packet data failed"); |
7591bab1 | 1657 | goto end_free; |
d3e2ba59 | 1658 | } |
d3e2ba59 | 1659 | |
553b2adb | 1660 | DBG("Sent %u bytes for stream %" PRIu64, reply_size, |
9b9f9f94 | 1661 | (uint64_t) be64toh(get_packet_info.stream_id)); |
d3e2ba59 | 1662 | |
7591bab1 | 1663 | end_free: |
553b2adb | 1664 | free(reply); |
d3e2ba59 | 1665 | end: |
7591bab1 MD |
1666 | if (vstream) { |
1667 | viewer_stream_put(vstream); | |
1668 | } | |
d3e2ba59 JD |
1669 | return ret; |
1670 | } | |
1671 | ||
1672 | /* | |
1673 | * Send the session's metadata | |
1674 | * | |
1675 | * Return 0 on success else a negative value. | |
1676 | */ | |
1677 | static | |
58eb9381 | 1678 | int viewer_get_metadata(struct relay_connection *conn) |
d3e2ba59 JD |
1679 | { |
1680 | int ret = 0; | |
1681 | ssize_t read_len; | |
1682 | uint64_t len = 0; | |
1683 | char *data = NULL; | |
1684 | struct lttng_viewer_get_metadata request; | |
1685 | struct lttng_viewer_metadata_packet reply; | |
7591bab1 | 1686 | struct relay_viewer_stream *vstream = NULL; |
d3e2ba59 | 1687 | |
58eb9381 | 1688 | assert(conn); |
d3e2ba59 JD |
1689 | |
1690 | DBG("Relay get metadata"); | |
1691 | ||
eea7556c | 1692 | health_code_update(); |
2f8f53af | 1693 | |
58eb9381 | 1694 | ret = recv_request(conn->sock, &request, sizeof(request)); |
2f8f53af | 1695 | if (ret < 0) { |
d3e2ba59 JD |
1696 | goto end; |
1697 | } | |
eea7556c | 1698 | health_code_update(); |
d3e2ba59 | 1699 | |
53efb85a MD |
1700 | memset(&reply, 0, sizeof(reply)); |
1701 | ||
7591bab1 MD |
1702 | vstream = viewer_stream_get_by_id(be64toh(request.stream_id)); |
1703 | if (!vstream) { | |
3b463131 MD |
1704 | /* |
1705 | * The metadata stream can be closed by a CLOSE command | |
1706 | * just before we attach. It can also be closed by | |
1707 | * per-pid tracing during tracing. Therefore, it is | |
1708 | * possible that we cannot find this viewer stream. | |
1709 | * Reply back to the client with an error if we cannot | |
1710 | * find it. | |
1711 | */ | |
a44ca2ca | 1712 | DBG("Client requested metadata of unknown stream id %" PRIu64, |
9b9f9f94 | 1713 | (uint64_t) be64toh(request.stream_id)); |
3b463131 | 1714 | reply.status = htobe32(LTTNG_VIEWER_METADATA_ERR); |
7591bab1 | 1715 | goto send_reply; |
d3e2ba59 | 1716 | } |
7591bab1 MD |
1717 | pthread_mutex_lock(&vstream->stream->lock); |
1718 | if (!vstream->stream->is_metadata) { | |
1719 | ERR("Invalid metadata stream"); | |
6763619c JD |
1720 | goto error; |
1721 | } | |
1722 | ||
7591bab1 | 1723 | assert(vstream->metadata_sent <= vstream->stream->metadata_received); |
2a174661 | 1724 | |
7591bab1 | 1725 | len = vstream->stream->metadata_received - vstream->metadata_sent; |
d3e2ba59 | 1726 | if (len == 0) { |
94f73d08 MD |
1727 | /* |
1728 | * The live viewers expect to receive a NO_NEW_METADATA | |
1729 | * status before a stream disappears, otherwise they abort the | |
1730 | * entire live connection when receiving an error status. | |
1731 | */ | |
c4e361a4 | 1732 | reply.status = htobe32(LTTNG_VIEWER_NO_NEW_METADATA); |
94f73d08 MD |
1733 | /* |
1734 | * The live viewer considers a closed 0 byte metadata stream as | |
1735 | * an error. | |
1736 | */ | |
1737 | if (vstream->metadata_sent > 0) { | |
1738 | vstream->stream->no_new_metadata_notified = true; | |
1739 | if (vstream->stream->closed) { | |
1740 | /* Release ownership for the viewer metadata stream. */ | |
1741 | viewer_stream_put(vstream); | |
1742 | } | |
1743 | } | |
d3e2ba59 JD |
1744 | goto send_reply; |
1745 | } | |
1746 | ||
1747 | /* first time, we open the metadata file */ | |
ebb29c10 JG |
1748 | if (!vstream->stream_file.fd) { |
1749 | int fd; | |
1750 | char file_path[LTTNG_PATH_MAX]; | |
1751 | enum lttng_trace_chunk_status status; | |
1752 | struct relay_stream *rstream = vstream->stream; | |
1753 | ||
1754 | ret = utils_stream_file_path(rstream->path_name, | |
1755 | rstream->channel_name, rstream->tracefile_size, | |
1756 | vstream->current_tracefile_id, NULL, file_path, | |
1757 | sizeof(file_path)); | |
d3e2ba59 JD |
1758 | if (ret < 0) { |
1759 | goto error; | |
1760 | } | |
ebb29c10 JG |
1761 | |
1762 | status = lttng_trace_chunk_open_file( | |
1763 | vstream->stream_file.trace_chunk, | |
1764 | file_path, O_RDONLY, 0, &fd); | |
1765 | if (status != LTTNG_TRACE_CHUNK_STATUS_OK) { | |
1766 | PERROR("Failed to open metadata file for viewer stream"); | |
d3e2ba59 JD |
1767 | goto error; |
1768 | } | |
ebb29c10 JG |
1769 | vstream->stream_file.fd = stream_fd_create(fd); |
1770 | if (!vstream->stream_file.fd) { | |
1771 | if (close(fd)) { | |
1772 | PERROR("Failed to close viewer metadata file"); | |
7591bab1 MD |
1773 | } |
1774 | goto error; | |
1775 | } | |
d3e2ba59 JD |
1776 | } |
1777 | ||
1778 | reply.len = htobe64(len); | |
1779 | data = zmalloc(len); | |
1780 | if (!data) { | |
1781 | PERROR("viewer metadata zmalloc"); | |
1782 | goto error; | |
1783 | } | |
1784 | ||
ebb29c10 | 1785 | read_len = lttng_read(vstream->stream_file.fd->fd, data, len); |
6cd525e8 | 1786 | if (read_len < len) { |
d3e2ba59 JD |
1787 | PERROR("Relay reading metadata file"); |
1788 | goto error; | |
1789 | } | |
7591bab1 | 1790 | vstream->metadata_sent += read_len; |
c4e361a4 | 1791 | reply.status = htobe32(LTTNG_VIEWER_METADATA_OK); |
7591bab1 | 1792 | |
d3e2ba59 JD |
1793 | goto send_reply; |
1794 | ||
1795 | error: | |
c4e361a4 | 1796 | reply.status = htobe32(LTTNG_VIEWER_METADATA_ERR); |
d3e2ba59 JD |
1797 | |
1798 | send_reply: | |
eea7556c | 1799 | health_code_update(); |
7591bab1 MD |
1800 | if (vstream) { |
1801 | pthread_mutex_unlock(&vstream->stream->lock); | |
1802 | } | |
58eb9381 | 1803 | ret = send_response(conn->sock, &reply, sizeof(reply)); |
d3e2ba59 | 1804 | if (ret < 0) { |
7591bab1 | 1805 | goto end_free; |
d3e2ba59 | 1806 | } |
eea7556c | 1807 | health_code_update(); |
d3e2ba59 JD |
1808 | |
1809 | if (len > 0) { | |
58eb9381 | 1810 | ret = send_response(conn->sock, data, len); |
d3e2ba59 | 1811 | if (ret < 0) { |
7591bab1 | 1812 | goto end_free; |
d3e2ba59 JD |
1813 | } |
1814 | } | |
1815 | ||
1816 | DBG("Sent %" PRIu64 " bytes of metadata for stream %" PRIu64, len, | |
9b9f9f94 | 1817 | (uint64_t) be64toh(request.stream_id)); |
d3e2ba59 JD |
1818 | |
1819 | DBG("Metadata sent"); | |
1820 | ||
7591bab1 | 1821 | end_free: |
d3e2ba59 | 1822 | free(data); |
d3e2ba59 | 1823 | end: |
7591bab1 MD |
1824 | if (vstream) { |
1825 | viewer_stream_put(vstream); | |
1826 | } | |
d3e2ba59 JD |
1827 | return ret; |
1828 | } | |
1829 | ||
c3b7390b JD |
1830 | /* |
1831 | * Create a viewer session. | |
1832 | * | |
1833 | * Return 0 on success or else a negative value. | |
1834 | */ | |
1835 | static | |
1836 | int viewer_create_session(struct relay_connection *conn) | |
1837 | { | |
1838 | int ret; | |
1839 | struct lttng_viewer_create_session_response resp; | |
1840 | ||
1841 | DBG("Viewer create session received"); | |
1842 | ||
53efb85a | 1843 | memset(&resp, 0, sizeof(resp)); |
c3b7390b | 1844 | resp.status = htobe32(LTTNG_VIEWER_CREATE_SESSION_OK); |
7591bab1 | 1845 | conn->viewer_session = viewer_session_create(); |
c3b7390b JD |
1846 | if (!conn->viewer_session) { |
1847 | ERR("Allocation viewer session"); | |
1848 | resp.status = htobe32(LTTNG_VIEWER_CREATE_SESSION_ERR); | |
1849 | goto send_reply; | |
1850 | } | |
c3b7390b JD |
1851 | |
1852 | send_reply: | |
1853 | health_code_update(); | |
1854 | ret = send_response(conn->sock, &resp, sizeof(resp)); | |
1855 | if (ret < 0) { | |
1856 | goto end; | |
1857 | } | |
1858 | health_code_update(); | |
1859 | ret = 0; | |
1860 | ||
1861 | end: | |
1862 | return ret; | |
1863 | } | |
1864 | ||
d62023be JD |
1865 | /* |
1866 | * Detach a viewer session. | |
1867 | * | |
1868 | * Return 0 on success or else a negative value. | |
1869 | */ | |
1870 | static | |
1871 | int viewer_detach_session(struct relay_connection *conn) | |
1872 | { | |
1873 | int ret; | |
1874 | struct lttng_viewer_detach_session_response response; | |
1875 | struct lttng_viewer_detach_session_request request; | |
1876 | struct relay_session *session = NULL; | |
1877 | uint64_t viewer_session_to_close; | |
1878 | ||
1879 | DBG("Viewer detach session received"); | |
1880 | ||
1881 | assert(conn); | |
1882 | ||
1883 | health_code_update(); | |
1884 | ||
1885 | /* Receive the request from the connected client. */ | |
1886 | ret = recv_request(conn->sock, &request, sizeof(request)); | |
1887 | if (ret < 0) { | |
1888 | goto end; | |
1889 | } | |
1890 | viewer_session_to_close = be64toh(request.session_id); | |
1891 | ||
1892 | if (!conn->viewer_session) { | |
1893 | DBG("Client trying to detach before creating a live viewer session"); | |
1894 | response.status = htobe32(LTTNG_VIEWER_DETACH_SESSION_ERR); | |
1895 | goto send_reply; | |
1896 | } | |
1897 | ||
1898 | health_code_update(); | |
1899 | ||
1900 | memset(&response, 0, sizeof(response)); | |
1901 | DBG("Detaching from session ID %" PRIu64, viewer_session_to_close); | |
1902 | ||
1903 | session = session_get_by_id(be64toh(request.session_id)); | |
1904 | if (!session) { | |
1905 | DBG("Relay session %" PRIu64 " not found", | |
9b9f9f94 | 1906 | (uint64_t) be64toh(request.session_id)); |
d62023be JD |
1907 | response.status = htobe32(LTTNG_VIEWER_DETACH_SESSION_UNK); |
1908 | goto send_reply; | |
1909 | } | |
1910 | ||
1911 | ret = viewer_session_is_attached(conn->viewer_session, session); | |
1912 | if (ret != 1) { | |
1913 | DBG("Not attached to this session"); | |
1914 | response.status = htobe32(LTTNG_VIEWER_DETACH_SESSION_ERR); | |
1915 | goto send_reply_put; | |
1916 | } | |
1917 | ||
1918 | viewer_session_close_one_session(conn->viewer_session, session); | |
1919 | response.status = htobe32(LTTNG_VIEWER_DETACH_SESSION_OK); | |
1920 | DBG("Session %" PRIu64 " detached.", viewer_session_to_close); | |
1921 | ||
1922 | send_reply_put: | |
1923 | session_put(session); | |
1924 | ||
1925 | send_reply: | |
1926 | health_code_update(); | |
1927 | ret = send_response(conn->sock, &response, sizeof(response)); | |
1928 | if (ret < 0) { | |
1929 | goto end; | |
1930 | } | |
1931 | health_code_update(); | |
1932 | ret = 0; | |
1933 | ||
1934 | end: | |
1935 | return ret; | |
1936 | } | |
c3b7390b | 1937 | |
d3e2ba59 JD |
1938 | /* |
1939 | * live_relay_unknown_command: send -1 if received unknown command | |
1940 | */ | |
1941 | static | |
58eb9381 | 1942 | void live_relay_unknown_command(struct relay_connection *conn) |
d3e2ba59 JD |
1943 | { |
1944 | struct lttcomm_relayd_generic_reply reply; | |
d3e2ba59 | 1945 | |
53efb85a | 1946 | memset(&reply, 0, sizeof(reply)); |
d3e2ba59 | 1947 | reply.ret_code = htobe32(LTTNG_ERR_UNK); |
58eb9381 | 1948 | (void) send_response(conn->sock, &reply, sizeof(reply)); |
d3e2ba59 JD |
1949 | } |
1950 | ||
1951 | /* | |
1952 | * Process the commands received on the control socket | |
1953 | */ | |
1954 | static | |
1955 | int process_control(struct lttng_viewer_cmd *recv_hdr, | |
58eb9381 | 1956 | struct relay_connection *conn) |
d3e2ba59 JD |
1957 | { |
1958 | int ret = 0; | |
2f8f53af DG |
1959 | uint32_t msg_value; |
1960 | ||
2f8f53af DG |
1961 | msg_value = be32toh(recv_hdr->cmd); |
1962 | ||
1963 | /* | |
1964 | * Make sure we've done the version check before any command other then a | |
1965 | * new client connection. | |
1966 | */ | |
c4e361a4 | 1967 | if (msg_value != LTTNG_VIEWER_CONNECT && !conn->version_check_done) { |
58eb9381 | 1968 | ERR("Viewer conn value %" PRIu32 " before version check", msg_value); |
2f8f53af DG |
1969 | ret = -1; |
1970 | goto end; | |
1971 | } | |
d3e2ba59 | 1972 | |
2f8f53af | 1973 | switch (msg_value) { |
c4e361a4 | 1974 | case LTTNG_VIEWER_CONNECT: |
58eb9381 | 1975 | ret = viewer_connect(conn); |
d3e2ba59 | 1976 | break; |
c4e361a4 | 1977 | case LTTNG_VIEWER_LIST_SESSIONS: |
58eb9381 | 1978 | ret = viewer_list_sessions(conn); |
d3e2ba59 | 1979 | break; |
c4e361a4 | 1980 | case LTTNG_VIEWER_ATTACH_SESSION: |
58eb9381 | 1981 | ret = viewer_attach_session(conn); |
d3e2ba59 | 1982 | break; |
c4e361a4 | 1983 | case LTTNG_VIEWER_GET_NEXT_INDEX: |
58eb9381 | 1984 | ret = viewer_get_next_index(conn); |
d3e2ba59 | 1985 | break; |
c4e361a4 | 1986 | case LTTNG_VIEWER_GET_PACKET: |
58eb9381 | 1987 | ret = viewer_get_packet(conn); |
d3e2ba59 | 1988 | break; |
c4e361a4 | 1989 | case LTTNG_VIEWER_GET_METADATA: |
58eb9381 | 1990 | ret = viewer_get_metadata(conn); |
d3e2ba59 | 1991 | break; |
c4e361a4 | 1992 | case LTTNG_VIEWER_GET_NEW_STREAMS: |
58eb9381 | 1993 | ret = viewer_get_new_streams(conn); |
80e8027a | 1994 | break; |
c3b7390b JD |
1995 | case LTTNG_VIEWER_CREATE_SESSION: |
1996 | ret = viewer_create_session(conn); | |
1997 | break; | |
d62023be JD |
1998 | case LTTNG_VIEWER_DETACH_SESSION: |
1999 | ret = viewer_detach_session(conn); | |
2000 | break; | |
d3e2ba59 | 2001 | default: |
7591bab1 MD |
2002 | ERR("Received unknown viewer command (%u)", |
2003 | be32toh(recv_hdr->cmd)); | |
58eb9381 | 2004 | live_relay_unknown_command(conn); |
d3e2ba59 JD |
2005 | ret = -1; |
2006 | goto end; | |
2007 | } | |
2008 | ||
2009 | end: | |
2010 | return ret; | |
2011 | } | |
2012 | ||
2013 | static | |
58eb9381 | 2014 | void cleanup_connection_pollfd(struct lttng_poll_event *events, int pollfd) |
d3e2ba59 JD |
2015 | { |
2016 | int ret; | |
2017 | ||
58eb9381 | 2018 | (void) lttng_poll_del(events, pollfd); |
d3e2ba59 JD |
2019 | |
2020 | ret = close(pollfd); | |
2021 | if (ret < 0) { | |
2022 | ERR("Closing pollfd %d", pollfd); | |
2023 | } | |
2024 | } | |
2025 | ||
d3e2ba59 JD |
2026 | /* |
2027 | * This thread does the actual work | |
2028 | */ | |
2029 | static | |
2030 | void *thread_worker(void *data) | |
2031 | { | |
2032 | int ret, err = -1; | |
2033 | uint32_t nb_fd; | |
d3e2ba59 | 2034 | struct lttng_poll_event events; |
7591bab1 | 2035 | struct lttng_ht *viewer_connections_ht; |
d3e2ba59 JD |
2036 | struct lttng_ht_iter iter; |
2037 | struct lttng_viewer_cmd recv_hdr; | |
302d8906 | 2038 | struct relay_connection *destroy_conn; |
d3e2ba59 JD |
2039 | |
2040 | DBG("[thread] Live viewer relay worker started"); | |
2041 | ||
2042 | rcu_register_thread(); | |
2043 | ||
eea7556c MD |
2044 | health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_WORKER); |
2045 | ||
9b5e0863 MD |
2046 | if (testpoint(relayd_thread_live_worker)) { |
2047 | goto error_testpoint; | |
2048 | } | |
2049 | ||
d3e2ba59 | 2050 | /* table of connections indexed on socket */ |
7591bab1 MD |
2051 | viewer_connections_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
2052 | if (!viewer_connections_ht) { | |
2053 | goto viewer_connections_ht_error; | |
d3e2ba59 JD |
2054 | } |
2055 | ||
2056 | ret = create_thread_poll_set(&events, 2); | |
2057 | if (ret < 0) { | |
2058 | goto error_poll_create; | |
2059 | } | |
2060 | ||
58eb9381 | 2061 | ret = lttng_poll_add(&events, live_conn_pipe[0], LPOLLIN | LPOLLRDHUP); |
d3e2ba59 JD |
2062 | if (ret < 0) { |
2063 | goto error; | |
2064 | } | |
2065 | ||
2066 | restart: | |
2067 | while (1) { | |
2068 | int i; | |
2069 | ||
eea7556c MD |
2070 | health_code_update(); |
2071 | ||
d3e2ba59 JD |
2072 | /* Infinite blocking call, waiting for transmission */ |
2073 | DBG3("Relayd live viewer worker thread polling..."); | |
eea7556c | 2074 | health_poll_entry(); |
d3e2ba59 | 2075 | ret = lttng_poll_wait(&events, -1); |
eea7556c | 2076 | health_poll_exit(); |
d3e2ba59 JD |
2077 | if (ret < 0) { |
2078 | /* | |
2079 | * Restart interrupted system call. | |
2080 | */ | |
2081 | if (errno == EINTR) { | |
2082 | goto restart; | |
2083 | } | |
2084 | goto error; | |
2085 | } | |
2086 | ||
2087 | nb_fd = ret; | |
2088 | ||
2089 | /* | |
2090 | * Process control. The control connection is prioritised so we don't | |
2091 | * starve it with high throughput tracing data on the data | |
2092 | * connection. | |
2093 | */ | |
2094 | for (i = 0; i < nb_fd; i++) { | |
2095 | /* Fetch once the poll data */ | |
2096 | uint32_t revents = LTTNG_POLL_GETEV(&events, i); | |
2097 | int pollfd = LTTNG_POLL_GETFD(&events, i); | |
2098 | ||
eea7556c MD |
2099 | health_code_update(); |
2100 | ||
d3e2ba59 | 2101 | /* Thread quit pipe has been closed. Killing thread. */ |
bcf4a440 | 2102 | ret = check_thread_quit_pipe(pollfd, revents); |
d3e2ba59 JD |
2103 | if (ret) { |
2104 | err = 0; | |
2105 | goto exit; | |
2106 | } | |
2107 | ||
7591bab1 | 2108 | /* Inspect the relay conn pipe for new connection. */ |
58eb9381 | 2109 | if (pollfd == live_conn_pipe[0]) { |
03e43155 | 2110 | if (revents & LPOLLIN) { |
302d8906 JG |
2111 | struct relay_connection *conn; |
2112 | ||
7591bab1 MD |
2113 | ret = lttng_read(live_conn_pipe[0], |
2114 | &conn, sizeof(conn)); | |
d3e2ba59 JD |
2115 | if (ret < 0) { |
2116 | goto error; | |
2117 | } | |
73039936 FD |
2118 | ret = lttng_poll_add(&events, |
2119 | conn->sock->fd, | |
58eb9381 | 2120 | LPOLLIN | LPOLLRDHUP); |
73039936 FD |
2121 | if (ret) { |
2122 | ERR("Failed to add new live connection file descriptor to poll set"); | |
2123 | goto error; | |
2124 | } | |
7591bab1 MD |
2125 | connection_ht_add(viewer_connections_ht, conn); |
2126 | DBG("Connection socket %d added to poll", conn->sock->fd); | |
03e43155 MD |
2127 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
2128 | ERR("Relay live pipe error"); | |
2129 | goto error; | |
2130 | } else { | |
2131 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
2132 | goto error; | |
d3e2ba59 | 2133 | } |
58eb9381 | 2134 | } else { |
7591bab1 | 2135 | /* Connection activity. */ |
302d8906 JG |
2136 | struct relay_connection *conn; |
2137 | ||
7591bab1 MD |
2138 | conn = connection_get_by_sock(viewer_connections_ht, pollfd); |
2139 | if (!conn) { | |
2140 | continue; | |
2141 | } | |
58eb9381 | 2142 | |
03e43155 | 2143 | if (revents & LPOLLIN) { |
58eb9381 DG |
2144 | ret = conn->sock->ops->recvmsg(conn->sock, &recv_hdr, |
2145 | sizeof(recv_hdr), 0); | |
d3e2ba59 | 2146 | if (ret <= 0) { |
7591bab1 | 2147 | /* Connection closed. */ |
58eb9381 | 2148 | cleanup_connection_pollfd(&events, pollfd); |
7591bab1 MD |
2149 | /* Put "create" ownership reference. */ |
2150 | connection_put(conn); | |
58eb9381 | 2151 | DBG("Viewer control conn closed with %d", pollfd); |
d3e2ba59 | 2152 | } else { |
58eb9381 | 2153 | ret = process_control(&recv_hdr, conn); |
d3e2ba59 JD |
2154 | if (ret < 0) { |
2155 | /* Clear the session on error. */ | |
58eb9381 | 2156 | cleanup_connection_pollfd(&events, pollfd); |
7591bab1 MD |
2157 | /* Put "create" ownership reference. */ |
2158 | connection_put(conn); | |
d3e2ba59 JD |
2159 | DBG("Viewer connection closed with %d", pollfd); |
2160 | } | |
2161 | } | |
03e43155 MD |
2162 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
2163 | cleanup_connection_pollfd(&events, pollfd); | |
2164 | /* Put "create" ownership reference. */ | |
2165 | connection_put(conn); | |
2166 | } else { | |
2167 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
2168 | connection_put(conn); | |
2169 | goto error; | |
d3e2ba59 | 2170 | } |
7591bab1 MD |
2171 | /* Put local "get_by_sock" reference. */ |
2172 | connection_put(conn); | |
d3e2ba59 JD |
2173 | } |
2174 | } | |
2175 | } | |
2176 | ||
2177 | exit: | |
2178 | error: | |
2179 | lttng_poll_clean(&events); | |
2180 | ||
71efa8ef | 2181 | /* Cleanup remaining connection object. */ |
d3e2ba59 | 2182 | rcu_read_lock(); |
7591bab1 | 2183 | cds_lfht_for_each_entry(viewer_connections_ht->ht, &iter.iter, |
302d8906 | 2184 | destroy_conn, |
58eb9381 | 2185 | sock_n.node) { |
eea7556c | 2186 | health_code_update(); |
7591bab1 | 2187 | connection_put(destroy_conn); |
d3e2ba59 JD |
2188 | } |
2189 | rcu_read_unlock(); | |
2190 | error_poll_create: | |
7591bab1 MD |
2191 | lttng_ht_destroy(viewer_connections_ht); |
2192 | viewer_connections_ht_error: | |
58eb9381 DG |
2193 | /* Close relay conn pipes */ |
2194 | utils_close_pipe(live_conn_pipe); | |
d3e2ba59 JD |
2195 | if (err) { |
2196 | DBG("Viewer worker thread exited with error"); | |
2197 | } | |
2198 | DBG("Viewer worker thread cleanup complete"); | |
9b5e0863 | 2199 | error_testpoint: |
eea7556c MD |
2200 | if (err) { |
2201 | health_error(); | |
2202 | ERR("Health error occurred in %s", __func__); | |
2203 | } | |
2204 | health_unregister(health_relayd); | |
b4aacfdc MD |
2205 | if (lttng_relay_stop_threads()) { |
2206 | ERR("Error stopping threads"); | |
178a0557 | 2207 | } |
d3e2ba59 JD |
2208 | rcu_unregister_thread(); |
2209 | return NULL; | |
2210 | } | |
2211 | ||
2212 | /* | |
2213 | * Create the relay command pipe to wake thread_manage_apps. | |
2214 | * Closed in cleanup(). | |
2215 | */ | |
58eb9381 | 2216 | static int create_conn_pipe(void) |
d3e2ba59 | 2217 | { |
178a0557 MD |
2218 | return utils_create_pipe_cloexec(live_conn_pipe); |
2219 | } | |
d3e2ba59 | 2220 | |
178a0557 | 2221 | int relayd_live_join(void) |
d3e2ba59 | 2222 | { |
178a0557 | 2223 | int ret, retval = 0; |
d3e2ba59 JD |
2224 | void *status; |
2225 | ||
d3e2ba59 | 2226 | ret = pthread_join(live_listener_thread, &status); |
178a0557 MD |
2227 | if (ret) { |
2228 | errno = ret; | |
d3e2ba59 | 2229 | PERROR("pthread_join live listener"); |
178a0557 | 2230 | retval = -1; |
d3e2ba59 JD |
2231 | } |
2232 | ||
2233 | ret = pthread_join(live_worker_thread, &status); | |
178a0557 MD |
2234 | if (ret) { |
2235 | errno = ret; | |
d3e2ba59 | 2236 | PERROR("pthread_join live worker"); |
178a0557 | 2237 | retval = -1; |
d3e2ba59 JD |
2238 | } |
2239 | ||
2240 | ret = pthread_join(live_dispatcher_thread, &status); | |
178a0557 MD |
2241 | if (ret) { |
2242 | errno = ret; | |
d3e2ba59 | 2243 | PERROR("pthread_join live dispatcher"); |
178a0557 | 2244 | retval = -1; |
d3e2ba59 JD |
2245 | } |
2246 | ||
178a0557 | 2247 | cleanup_relayd_live(); |
d3e2ba59 | 2248 | |
178a0557 | 2249 | return retval; |
d3e2ba59 JD |
2250 | } |
2251 | ||
2252 | /* | |
2253 | * main | |
2254 | */ | |
7591bab1 | 2255 | int relayd_live_create(struct lttng_uri *uri) |
d3e2ba59 | 2256 | { |
178a0557 | 2257 | int ret = 0, retval = 0; |
d3e2ba59 JD |
2258 | void *status; |
2259 | int is_root; | |
2260 | ||
178a0557 MD |
2261 | if (!uri) { |
2262 | retval = -1; | |
2263 | goto exit_init_data; | |
2264 | } | |
d3e2ba59 JD |
2265 | live_uri = uri; |
2266 | ||
d3e2ba59 JD |
2267 | /* Check if daemon is UID = 0 */ |
2268 | is_root = !getuid(); | |
2269 | ||
2270 | if (!is_root) { | |
2271 | if (live_uri->port < 1024) { | |
2272 | ERR("Need to be root to use ports < 1024"); | |
178a0557 MD |
2273 | retval = -1; |
2274 | goto exit_init_data; | |
d3e2ba59 JD |
2275 | } |
2276 | } | |
2277 | ||
2278 | /* Setup the thread apps communication pipe. */ | |
178a0557 MD |
2279 | if (create_conn_pipe()) { |
2280 | retval = -1; | |
2281 | goto exit_init_data; | |
d3e2ba59 JD |
2282 | } |
2283 | ||
2284 | /* Init relay command queue. */ | |
8bdee6e2 | 2285 | cds_wfcq_init(&viewer_conn_queue.head, &viewer_conn_queue.tail); |
d3e2ba59 JD |
2286 | |
2287 | /* Set up max poll set size */ | |
25b397f9 MD |
2288 | if (lttng_poll_set_max_size()) { |
2289 | retval = -1; | |
2290 | goto exit_init_data; | |
2291 | } | |
d3e2ba59 JD |
2292 | |
2293 | /* Setup the dispatcher thread */ | |
1a1a34b4 | 2294 | ret = pthread_create(&live_dispatcher_thread, default_pthread_attr(), |
d3e2ba59 | 2295 | thread_dispatcher, (void *) NULL); |
178a0557 MD |
2296 | if (ret) { |
2297 | errno = ret; | |
d3e2ba59 | 2298 | PERROR("pthread_create viewer dispatcher"); |
178a0557 MD |
2299 | retval = -1; |
2300 | goto exit_dispatcher_thread; | |
d3e2ba59 JD |
2301 | } |
2302 | ||
2303 | /* Setup the worker thread */ | |
1a1a34b4 | 2304 | ret = pthread_create(&live_worker_thread, default_pthread_attr(), |
7591bab1 | 2305 | thread_worker, NULL); |
178a0557 MD |
2306 | if (ret) { |
2307 | errno = ret; | |
d3e2ba59 | 2308 | PERROR("pthread_create viewer worker"); |
178a0557 MD |
2309 | retval = -1; |
2310 | goto exit_worker_thread; | |
d3e2ba59 JD |
2311 | } |
2312 | ||
2313 | /* Setup the listener thread */ | |
1a1a34b4 | 2314 | ret = pthread_create(&live_listener_thread, default_pthread_attr(), |
d3e2ba59 | 2315 | thread_listener, (void *) NULL); |
178a0557 MD |
2316 | if (ret) { |
2317 | errno = ret; | |
d3e2ba59 | 2318 | PERROR("pthread_create viewer listener"); |
178a0557 MD |
2319 | retval = -1; |
2320 | goto exit_listener_thread; | |
d3e2ba59 JD |
2321 | } |
2322 | ||
178a0557 MD |
2323 | /* |
2324 | * All OK, started all threads. | |
2325 | */ | |
2326 | return retval; | |
2327 | ||
9911d21b JG |
2328 | /* |
2329 | * Join on the live_listener_thread should anything be added after | |
2330 | * the live_listener thread's creation. | |
2331 | */ | |
d3e2ba59 | 2332 | |
178a0557 | 2333 | exit_listener_thread: |
d3e2ba59 | 2334 | |
d3e2ba59 | 2335 | ret = pthread_join(live_worker_thread, &status); |
178a0557 MD |
2336 | if (ret) { |
2337 | errno = ret; | |
d3e2ba59 | 2338 | PERROR("pthread_join live worker"); |
178a0557 | 2339 | retval = -1; |
d3e2ba59 | 2340 | } |
178a0557 | 2341 | exit_worker_thread: |
d3e2ba59 | 2342 | |
d3e2ba59 | 2343 | ret = pthread_join(live_dispatcher_thread, &status); |
178a0557 MD |
2344 | if (ret) { |
2345 | errno = ret; | |
d3e2ba59 | 2346 | PERROR("pthread_join live dispatcher"); |
178a0557 | 2347 | retval = -1; |
d3e2ba59 | 2348 | } |
178a0557 | 2349 | exit_dispatcher_thread: |
d3e2ba59 | 2350 | |
178a0557 MD |
2351 | exit_init_data: |
2352 | cleanup_relayd_live(); | |
d3e2ba59 | 2353 | |
178a0557 | 2354 | return retval; |
d3e2ba59 | 2355 | } |