Commit | Line | Data |
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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> | |
87bcbe91 | 56 | #include <common/fd-tracker/utils.h> |
d3e2ba59 JD |
57 | |
58 | #include "cmd.h" | |
59 | #include "live.h" | |
60 | #include "lttng-relayd.h" | |
d3e2ba59 | 61 | #include "utils.h" |
eea7556c | 62 | #include "health-relayd.h" |
9b5e0863 | 63 | #include "testpoint.h" |
2f8f53af | 64 | #include "viewer-stream.h" |
2a174661 DG |
65 | #include "stream.h" |
66 | #include "session.h" | |
67 | #include "ctf-trace.h" | |
58eb9381 | 68 | #include "connection.h" |
7591bab1 MD |
69 | #include "viewer-session.h" |
70 | ||
71 | #define SESSION_BUF_DEFAULT_COUNT 16 | |
d3e2ba59 JD |
72 | |
73 | static struct lttng_uri *live_uri; | |
74 | ||
d3e2ba59 JD |
75 | /* |
76 | * This pipe is used to inform the worker thread that a command is queued and | |
77 | * ready to be processed. | |
78 | */ | |
58eb9381 | 79 | static int live_conn_pipe[2] = { -1, -1 }; |
d3e2ba59 JD |
80 | |
81 | /* Shared between threads */ | |
82 | static int live_dispatch_thread_exit; | |
83 | ||
84 | static pthread_t live_listener_thread; | |
85 | static pthread_t live_dispatcher_thread; | |
86 | static pthread_t live_worker_thread; | |
87 | ||
88 | /* | |
89 | * Relay command queue. | |
90 | * | |
91 | * The live_thread_listener and live_thread_dispatcher communicate with this | |
92 | * queue. | |
93 | */ | |
58eb9381 | 94 | static struct relay_conn_queue viewer_conn_queue; |
d3e2ba59 JD |
95 | |
96 | static uint64_t last_relay_viewer_session_id; | |
7591bab1 MD |
97 | static pthread_mutex_t last_relay_viewer_session_id_lock = |
98 | PTHREAD_MUTEX_INITIALIZER; | |
d3e2ba59 JD |
99 | |
100 | /* | |
101 | * Cleanup the daemon | |
102 | */ | |
103 | static | |
178a0557 | 104 | void cleanup_relayd_live(void) |
d3e2ba59 JD |
105 | { |
106 | DBG("Cleaning up"); | |
107 | ||
d3e2ba59 JD |
108 | free(live_uri); |
109 | } | |
110 | ||
2f8f53af DG |
111 | /* |
112 | * Receive a request buffer using a given socket, destination allocated buffer | |
113 | * of length size. | |
114 | * | |
115 | * Return the size of the received message or else a negative value on error | |
116 | * with errno being set by recvmsg() syscall. | |
117 | */ | |
118 | static | |
119 | ssize_t recv_request(struct lttcomm_sock *sock, void *buf, size_t size) | |
120 | { | |
121 | ssize_t ret; | |
122 | ||
2f8f53af DG |
123 | ret = sock->ops->recvmsg(sock, buf, size, 0); |
124 | if (ret < 0 || ret != size) { | |
125 | if (ret == 0) { | |
126 | /* Orderly shutdown. Not necessary to print an error. */ | |
127 | DBG("Socket %d did an orderly shutdown", sock->fd); | |
128 | } else { | |
129 | ERR("Relay failed to receive request."); | |
130 | } | |
131 | ret = -1; | |
132 | } | |
133 | ||
134 | return ret; | |
135 | } | |
136 | ||
137 | /* | |
138 | * Send a response buffer using a given socket, source allocated buffer of | |
139 | * length size. | |
140 | * | |
141 | * Return the size of the sent message or else a negative value on error with | |
142 | * errno being set by sendmsg() syscall. | |
143 | */ | |
144 | static | |
145 | ssize_t send_response(struct lttcomm_sock *sock, void *buf, size_t size) | |
146 | { | |
147 | ssize_t ret; | |
148 | ||
2f8f53af DG |
149 | ret = sock->ops->sendmsg(sock, buf, size, 0); |
150 | if (ret < 0) { | |
151 | ERR("Relayd failed to send response."); | |
152 | } | |
153 | ||
154 | return ret; | |
155 | } | |
156 | ||
157 | /* | |
f04a971b JD |
158 | * Atomically check if new streams got added in one of the sessions attached |
159 | * and reset the flag to 0. | |
2f8f53af DG |
160 | * |
161 | * Returns 1 if new streams got added, 0 if nothing changed, a negative value | |
162 | * on error. | |
163 | */ | |
164 | static | |
f04a971b | 165 | int check_new_streams(struct relay_connection *conn) |
2f8f53af | 166 | { |
2f8f53af | 167 | struct relay_session *session; |
f04a971b JD |
168 | unsigned long current_val; |
169 | int ret = 0; | |
2f8f53af | 170 | |
f04a971b JD |
171 | if (!conn->viewer_session) { |
172 | goto end; | |
173 | } | |
7591bab1 MD |
174 | rcu_read_lock(); |
175 | cds_list_for_each_entry_rcu(session, | |
176 | &conn->viewer_session->session_list, | |
177 | viewer_session_node) { | |
178 | if (!session_get(session)) { | |
179 | continue; | |
180 | } | |
f04a971b JD |
181 | current_val = uatomic_cmpxchg(&session->new_streams, 1, 0); |
182 | ret = current_val; | |
7591bab1 | 183 | session_put(session); |
f04a971b JD |
184 | if (ret == 1) { |
185 | goto end; | |
186 | } | |
2f8f53af | 187 | } |
f04a971b | 188 | end: |
7591bab1 | 189 | rcu_read_unlock(); |
2f8f53af DG |
190 | return ret; |
191 | } | |
192 | ||
193 | /* | |
194 | * Send viewer streams to the given socket. The ignore_sent_flag indicates if | |
195 | * this function should ignore the sent flag or not. | |
196 | * | |
197 | * Return 0 on success or else a negative value. | |
198 | */ | |
199 | static | |
200 | ssize_t send_viewer_streams(struct lttcomm_sock *sock, | |
c06fdd95 | 201 | uint64_t session_id, unsigned int ignore_sent_flag) |
2f8f53af DG |
202 | { |
203 | ssize_t ret; | |
204 | struct lttng_viewer_stream send_stream; | |
205 | struct lttng_ht_iter iter; | |
206 | struct relay_viewer_stream *vstream; | |
207 | ||
2f8f53af DG |
208 | rcu_read_lock(); |
209 | ||
210 | cds_lfht_for_each_entry(viewer_streams_ht->ht, &iter.iter, vstream, | |
211 | stream_n.node) { | |
2a174661 DG |
212 | struct ctf_trace *ctf_trace; |
213 | ||
2f8f53af DG |
214 | health_code_update(); |
215 | ||
7591bab1 MD |
216 | if (!viewer_stream_get(vstream)) { |
217 | continue; | |
218 | } | |
219 | ||
220 | pthread_mutex_lock(&vstream->stream->lock); | |
2f8f53af | 221 | /* Ignore if not the same session. */ |
c06fdd95 | 222 | if (vstream->stream->trace->session->id != session_id || |
2f8f53af | 223 | (!ignore_sent_flag && vstream->sent_flag)) { |
7591bab1 MD |
224 | pthread_mutex_unlock(&vstream->stream->lock); |
225 | viewer_stream_put(vstream); | |
2f8f53af DG |
226 | continue; |
227 | } | |
228 | ||
7591bab1 MD |
229 | ctf_trace = vstream->stream->trace; |
230 | send_stream.id = htobe64(vstream->stream->stream_handle); | |
2a174661 | 231 | send_stream.ctf_trace_id = htobe64(ctf_trace->id); |
7591bab1 MD |
232 | send_stream.metadata_flag = htobe32( |
233 | vstream->stream->is_metadata); | |
f8f011fb MD |
234 | if (lttng_strncpy(send_stream.path_name, vstream->path_name, |
235 | sizeof(send_stream.path_name))) { | |
236 | pthread_mutex_unlock(&vstream->stream->lock); | |
237 | viewer_stream_put(vstream); | |
238 | ret = -1; /* Error. */ | |
239 | goto end_unlock; | |
240 | } | |
241 | if (lttng_strncpy(send_stream.channel_name, | |
242 | vstream->channel_name, | |
243 | sizeof(send_stream.channel_name))) { | |
244 | pthread_mutex_unlock(&vstream->stream->lock); | |
245 | viewer_stream_put(vstream); | |
246 | ret = -1; /* Error. */ | |
247 | goto end_unlock; | |
248 | } | |
2f8f53af | 249 | |
7591bab1 MD |
250 | DBG("Sending stream %" PRIu64 " to viewer", |
251 | vstream->stream->stream_handle); | |
252 | vstream->sent_flag = 1; | |
253 | pthread_mutex_unlock(&vstream->stream->lock); | |
254 | ||
2f8f53af | 255 | ret = send_response(sock, &send_stream, sizeof(send_stream)); |
7591bab1 | 256 | viewer_stream_put(vstream); |
2f8f53af DG |
257 | if (ret < 0) { |
258 | goto end_unlock; | |
259 | } | |
2f8f53af DG |
260 | } |
261 | ||
262 | ret = 0; | |
263 | ||
264 | end_unlock: | |
265 | rcu_read_unlock(); | |
266 | return ret; | |
267 | } | |
268 | ||
269 | /* | |
270 | * Create every viewer stream possible for the given session with the seek | |
271 | * type. Three counters *can* be return which are in order the total amount of | |
272 | * viewer stream of the session, the number of unsent stream and the number of | |
273 | * stream created. Those counters can be NULL and thus will be ignored. | |
274 | * | |
c06fdd95 JG |
275 | * session must be locked to ensure that we see either none or all initial |
276 | * streams for a session, but no intermediate state.. | |
277 | * | |
2f8f53af DG |
278 | * Return 0 on success or else a negative value. |
279 | */ | |
b66a15d1 JG |
280 | static int make_viewer_streams(struct relay_session *session, |
281 | struct lttng_trace_chunk *viewer_trace_chunk, | |
282 | enum lttng_viewer_seek seek_t, | |
283 | uint32_t *nb_total, | |
284 | uint32_t *nb_unsent, | |
285 | uint32_t *nb_created, | |
286 | bool *closed) | |
2f8f53af DG |
287 | { |
288 | int ret; | |
2f8f53af | 289 | struct lttng_ht_iter iter; |
2a174661 | 290 | struct ctf_trace *ctf_trace; |
2f8f53af DG |
291 | |
292 | assert(session); | |
c06fdd95 | 293 | ASSERT_LOCKED(session->lock); |
2f8f53af | 294 | |
dbd6665b JG |
295 | if (!viewer_trace_chunk) { |
296 | ERR("Internal error: viewer session associated with session \"%s\" has a NULL trace chunk", | |
297 | session->session_name); | |
298 | ret = -1; | |
299 | goto error; | |
300 | } | |
301 | ||
bddf80e4 MD |
302 | if (session->connection_closed) { |
303 | *closed = true; | |
304 | } | |
305 | ||
2f8f53af | 306 | /* |
7591bab1 MD |
307 | * Create viewer streams for relay streams that are ready to be |
308 | * used for a the given session id only. | |
2f8f53af | 309 | */ |
2a174661 DG |
310 | rcu_read_lock(); |
311 | cds_lfht_for_each_entry(session->ctf_traces_ht->ht, &iter.iter, ctf_trace, | |
312 | node.node) { | |
123ed7c2 | 313 | bool trace_has_metadata_stream = false; |
2a174661 | 314 | struct relay_stream *stream; |
2f8f53af DG |
315 | |
316 | health_code_update(); | |
317 | ||
7591bab1 | 318 | if (!ctf_trace_get(ctf_trace)) { |
2f8f53af DG |
319 | continue; |
320 | } | |
321 | ||
123ed7c2 FD |
322 | /* |
323 | * Iterate over all the streams of the trace to see if we have a | |
324 | * metadata stream. | |
325 | */ | |
326 | cds_list_for_each_entry_rcu( | |
327 | stream, &ctf_trace->stream_list, stream_node) | |
328 | { | |
329 | if (stream->is_metadata) { | |
330 | trace_has_metadata_stream = true; | |
331 | break; | |
332 | } | |
333 | } | |
334 | ||
335 | /* | |
336 | * If there is no metadata stream in this trace at the moment | |
337 | * and we never sent one to the viewer, skip the trace. We | |
338 | * accept that the viewer will not see this trace at all. | |
339 | */ | |
340 | if (!trace_has_metadata_stream && | |
341 | !ctf_trace->metadata_stream_sent_to_viewer) { | |
3d7708ff JG |
342 | ctf_trace_put(ctf_trace); |
343 | continue; | |
123ed7c2 FD |
344 | } |
345 | ||
7591bab1 | 346 | cds_list_for_each_entry_rcu(stream, &ctf_trace->stream_list, stream_node) { |
2a174661 DG |
347 | struct relay_viewer_stream *vstream; |
348 | ||
7591bab1 | 349 | if (!stream_get(stream)) { |
2a174661 DG |
350 | continue; |
351 | } | |
7591bab1 | 352 | /* |
d812ecb9 | 353 | * stream published is protected by the session lock. |
7591bab1 MD |
354 | */ |
355 | if (!stream->published) { | |
356 | goto next; | |
357 | } | |
358 | vstream = viewer_stream_get_by_id(stream->stream_handle); | |
2f8f53af | 359 | if (!vstream) { |
123ed7c2 FD |
360 | /* |
361 | * Save that we sent the metadata stream to the | |
362 | * viewer. So that we know what trace the viewer | |
363 | * is aware of. | |
364 | */ | |
365 | if (stream->is_metadata) { | |
366 | ctf_trace->metadata_stream_sent_to_viewer = | |
367 | true; | |
368 | } | |
b66a15d1 JG |
369 | vstream = viewer_stream_create(stream, |
370 | viewer_trace_chunk, seek_t); | |
2a174661 DG |
371 | if (!vstream) { |
372 | ret = -1; | |
7591bab1 MD |
373 | ctf_trace_put(ctf_trace); |
374 | stream_put(stream); | |
2a174661 DG |
375 | goto error_unlock; |
376 | } | |
2a174661 DG |
377 | |
378 | if (nb_created) { | |
379 | /* Update number of created stream counter. */ | |
380 | (*nb_created)++; | |
381 | } | |
2229a09c MD |
382 | /* |
383 | * Ensure a self-reference is preserved even | |
384 | * after we have put our local reference. | |
385 | */ | |
862d3a3b MD |
386 | if (!viewer_stream_get(vstream)) { |
387 | ERR("Unable to get self-reference on viewer stream, logic error."); | |
388 | abort(); | |
389 | } | |
7591bab1 MD |
390 | } else { |
391 | if (!vstream->sent_flag && nb_unsent) { | |
392 | /* Update number of unsent stream counter. */ | |
393 | (*nb_unsent)++; | |
394 | } | |
2f8f53af | 395 | } |
2a174661 DG |
396 | /* Update number of total stream counter. */ |
397 | if (nb_total) { | |
2229a09c MD |
398 | if (stream->is_metadata) { |
399 | if (!stream->closed || | |
400 | stream->metadata_received > vstream->metadata_sent) { | |
401 | (*nb_total)++; | |
402 | } | |
403 | } else { | |
404 | if (!stream->closed || | |
a8f9f353 | 405 | !(((int64_t) (stream->prev_data_seq - stream->last_net_seq_num)) >= 0)) { |
2229a09c MD |
406 | |
407 | (*nb_total)++; | |
408 | } | |
409 | } | |
2f8f53af | 410 | } |
2229a09c MD |
411 | /* Put local reference. */ |
412 | viewer_stream_put(vstream); | |
7591bab1 MD |
413 | next: |
414 | stream_put(stream); | |
2f8f53af | 415 | } |
7591bab1 | 416 | ctf_trace_put(ctf_trace); |
2f8f53af DG |
417 | } |
418 | ||
419 | ret = 0; | |
420 | ||
421 | error_unlock: | |
2a174661 | 422 | rcu_read_unlock(); |
dbd6665b | 423 | error: |
2f8f53af DG |
424 | return ret; |
425 | } | |
426 | ||
b4aacfdc | 427 | int relayd_live_stop(void) |
d3e2ba59 | 428 | { |
b4aacfdc | 429 | /* Stop dispatch thread */ |
d3e2ba59 | 430 | CMM_STORE_SHARED(live_dispatch_thread_exit, 1); |
58eb9381 | 431 | futex_nto1_wake(&viewer_conn_queue.futex); |
b4aacfdc | 432 | return 0; |
d3e2ba59 JD |
433 | } |
434 | ||
d3e2ba59 JD |
435 | /* |
436 | * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set. | |
437 | */ | |
438 | static | |
23f940ff JG |
439 | int create_named_thread_poll_set(struct lttng_poll_event *events, |
440 | int size, const char *name) | |
d3e2ba59 JD |
441 | { |
442 | int ret; | |
443 | ||
444 | if (events == NULL || size == 0) { | |
445 | ret = -1; | |
446 | goto error; | |
447 | } | |
448 | ||
23f940ff JG |
449 | ret = fd_tracker_util_poll_create(the_fd_tracker, |
450 | name, events, 1, LTTNG_CLOEXEC); | |
d3e2ba59 JD |
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 | ||
23f940ff JG |
464 | /* |
465 | * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set. | |
466 | */ | |
467 | static | |
468 | int create_thread_poll_set(struct lttng_poll_event *events, int size) | |
469 | { | |
470 | return create_named_thread_poll_set(events, size, "Unknown epoll"); | |
471 | } | |
472 | ||
d3e2ba59 JD |
473 | /* |
474 | * Check if the thread quit pipe was triggered. | |
475 | * | |
476 | * Return 1 if it was triggered else 0; | |
477 | */ | |
478 | static | |
bcf4a440 | 479 | int check_thread_quit_pipe(int fd, uint32_t events) |
d3e2ba59 | 480 | { |
bcf4a440 | 481 | if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) { |
d3e2ba59 JD |
482 | return 1; |
483 | } | |
484 | ||
485 | return 0; | |
486 | } | |
487 | ||
488 | /* | |
489 | * Create and init socket from uri. | |
490 | */ | |
491 | static | |
492 | struct lttcomm_sock *init_socket(struct lttng_uri *uri) | |
493 | { | |
494 | int ret; | |
495 | struct lttcomm_sock *sock = NULL; | |
496 | ||
497 | sock = lttcomm_alloc_sock_from_uri(uri); | |
498 | if (sock == NULL) { | |
499 | ERR("Allocating socket"); | |
500 | goto error; | |
501 | } | |
502 | ||
503 | ret = lttcomm_create_sock(sock); | |
504 | if (ret < 0) { | |
505 | goto error; | |
506 | } | |
2288467f | 507 | DBG("Listening on sock %d for lttng-live", sock->fd); |
d3e2ba59 JD |
508 | |
509 | ret = sock->ops->bind(sock); | |
510 | if (ret < 0) { | |
2288467f | 511 | PERROR("Failed to bind lttng-live socket"); |
d3e2ba59 JD |
512 | goto error; |
513 | } | |
514 | ||
515 | ret = sock->ops->listen(sock, -1); | |
516 | if (ret < 0) { | |
517 | goto error; | |
518 | ||
519 | } | |
520 | ||
521 | return sock; | |
522 | ||
523 | error: | |
524 | if (sock) { | |
525 | lttcomm_destroy_sock(sock); | |
526 | } | |
527 | return NULL; | |
528 | } | |
529 | ||
530 | /* | |
531 | * This thread manages the listening for new connections on the network | |
532 | */ | |
533 | static | |
534 | void *thread_listener(void *data) | |
535 | { | |
536 | int i, ret, pollfd, err = -1; | |
d3e2ba59 JD |
537 | uint32_t revents, nb_fd; |
538 | struct lttng_poll_event events; | |
539 | struct lttcomm_sock *live_control_sock; | |
540 | ||
541 | DBG("[thread] Relay live listener started"); | |
542 | ||
eea7556c MD |
543 | health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_LISTENER); |
544 | ||
545 | health_code_update(); | |
546 | ||
d3e2ba59 JD |
547 | live_control_sock = init_socket(live_uri); |
548 | if (!live_control_sock) { | |
549 | goto error_sock_control; | |
550 | } | |
551 | ||
fb4d42ab | 552 | /* Pass 2 as size here for the thread quit pipe and control sockets. */ |
23f940ff JG |
553 | ret = create_named_thread_poll_set(&events, 2, |
554 | "Live listener thread epoll"); | |
d3e2ba59 JD |
555 | if (ret < 0) { |
556 | goto error_create_poll; | |
557 | } | |
558 | ||
559 | /* Add the control socket */ | |
560 | ret = lttng_poll_add(&events, live_control_sock->fd, LPOLLIN | LPOLLRDHUP); | |
561 | if (ret < 0) { | |
562 | goto error_poll_add; | |
563 | } | |
564 | ||
3fd27398 MD |
565 | lttng_relay_notify_ready(); |
566 | ||
9b5e0863 MD |
567 | if (testpoint(relayd_thread_live_listener)) { |
568 | goto error_testpoint; | |
569 | } | |
570 | ||
d3e2ba59 | 571 | while (1) { |
eea7556c MD |
572 | health_code_update(); |
573 | ||
d3e2ba59 JD |
574 | DBG("Listener accepting live viewers connections"); |
575 | ||
576 | restart: | |
eea7556c | 577 | health_poll_entry(); |
d3e2ba59 | 578 | ret = lttng_poll_wait(&events, -1); |
eea7556c | 579 | health_poll_exit(); |
d3e2ba59 JD |
580 | if (ret < 0) { |
581 | /* | |
582 | * Restart interrupted system call. | |
583 | */ | |
584 | if (errno == EINTR) { | |
585 | goto restart; | |
586 | } | |
587 | goto error; | |
588 | } | |
589 | nb_fd = ret; | |
590 | ||
591 | DBG("Relay new viewer connection received"); | |
592 | for (i = 0; i < nb_fd; i++) { | |
eea7556c MD |
593 | health_code_update(); |
594 | ||
d3e2ba59 JD |
595 | /* Fetch once the poll data */ |
596 | revents = LTTNG_POLL_GETEV(&events, i); | |
597 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
598 | ||
599 | /* Thread quit pipe has been closed. Killing thread. */ | |
bcf4a440 | 600 | ret = check_thread_quit_pipe(pollfd, revents); |
d3e2ba59 JD |
601 | if (ret) { |
602 | err = 0; | |
603 | goto exit; | |
604 | } | |
605 | ||
03e43155 | 606 | if (revents & LPOLLIN) { |
d3e2ba59 | 607 | /* |
7591bab1 MD |
608 | * A new connection is requested, therefore a |
609 | * viewer connection is allocated in this | |
610 | * thread, enqueued to a global queue and | |
611 | * dequeued (and freed) in the worker thread. | |
d3e2ba59 | 612 | */ |
58eb9381 DG |
613 | int val = 1; |
614 | struct relay_connection *new_conn; | |
d3e2ba59 JD |
615 | struct lttcomm_sock *newsock; |
616 | ||
d3e2ba59 JD |
617 | newsock = live_control_sock->ops->accept(live_control_sock); |
618 | if (!newsock) { | |
619 | PERROR("accepting control sock"); | |
d3e2ba59 JD |
620 | goto error; |
621 | } | |
622 | DBG("Relay viewer connection accepted socket %d", newsock->fd); | |
58eb9381 | 623 | |
d3e2ba59 | 624 | ret = setsockopt(newsock->fd, SOL_SOCKET, SO_REUSEADDR, &val, |
58eb9381 | 625 | sizeof(val)); |
d3e2ba59 JD |
626 | if (ret < 0) { |
627 | PERROR("setsockopt inet"); | |
628 | lttcomm_destroy_sock(newsock); | |
d3e2ba59 JD |
629 | goto error; |
630 | } | |
7591bab1 MD |
631 | new_conn = connection_create(newsock, RELAY_CONNECTION_UNKNOWN); |
632 | if (!new_conn) { | |
633 | lttcomm_destroy_sock(newsock); | |
634 | goto error; | |
635 | } | |
636 | /* Ownership assumed by the connection. */ | |
637 | newsock = NULL; | |
d3e2ba59 | 638 | |
58eb9381 | 639 | /* Enqueue request for the dispatcher thread. */ |
8bdee6e2 SM |
640 | cds_wfcq_enqueue(&viewer_conn_queue.head, &viewer_conn_queue.tail, |
641 | &new_conn->qnode); | |
d3e2ba59 JD |
642 | |
643 | /* | |
7591bab1 MD |
644 | * Wake the dispatch queue futex. |
645 | * Implicit memory barrier with the | |
646 | * exchange in cds_wfcq_enqueue. | |
d3e2ba59 | 647 | */ |
58eb9381 | 648 | futex_nto1_wake(&viewer_conn_queue.futex); |
03e43155 MD |
649 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
650 | ERR("socket poll error"); | |
651 | goto error; | |
652 | } else { | |
653 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
654 | goto error; | |
d3e2ba59 JD |
655 | } |
656 | } | |
657 | } | |
658 | ||
659 | exit: | |
660 | error: | |
661 | error_poll_add: | |
9b5e0863 | 662 | error_testpoint: |
23f940ff | 663 | (void) fd_tracker_util_poll_clean(the_fd_tracker, &events); |
d3e2ba59 JD |
664 | error_create_poll: |
665 | if (live_control_sock->fd >= 0) { | |
666 | ret = live_control_sock->ops->close(live_control_sock); | |
667 | if (ret) { | |
668 | PERROR("close"); | |
669 | } | |
670 | } | |
671 | lttcomm_destroy_sock(live_control_sock); | |
672 | error_sock_control: | |
673 | if (err) { | |
eea7556c | 674 | health_error(); |
d3e2ba59 JD |
675 | DBG("Live viewer listener thread exited with error"); |
676 | } | |
eea7556c | 677 | health_unregister(health_relayd); |
d3e2ba59 | 678 | DBG("Live viewer listener thread cleanup complete"); |
b4aacfdc MD |
679 | if (lttng_relay_stop_threads()) { |
680 | ERR("Error stopping threads"); | |
178a0557 | 681 | } |
d3e2ba59 JD |
682 | return NULL; |
683 | } | |
684 | ||
685 | /* | |
686 | * This thread manages the dispatching of the requests to worker threads | |
687 | */ | |
688 | static | |
689 | void *thread_dispatcher(void *data) | |
690 | { | |
6cd525e8 MD |
691 | int err = -1; |
692 | ssize_t ret; | |
8bdee6e2 | 693 | struct cds_wfcq_node *node; |
58eb9381 | 694 | struct relay_connection *conn = NULL; |
d3e2ba59 JD |
695 | |
696 | DBG("[thread] Live viewer relay dispatcher started"); | |
697 | ||
eea7556c MD |
698 | health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_DISPATCHER); |
699 | ||
9b5e0863 MD |
700 | if (testpoint(relayd_thread_live_dispatcher)) { |
701 | goto error_testpoint; | |
702 | } | |
703 | ||
eea7556c MD |
704 | health_code_update(); |
705 | ||
0ed3b1a8 | 706 | for (;;) { |
eea7556c MD |
707 | health_code_update(); |
708 | ||
d3e2ba59 | 709 | /* Atomically prepare the queue futex */ |
58eb9381 | 710 | futex_nto1_prepare(&viewer_conn_queue.futex); |
d3e2ba59 | 711 | |
0ed3b1a8 MD |
712 | if (CMM_LOAD_SHARED(live_dispatch_thread_exit)) { |
713 | break; | |
714 | } | |
715 | ||
d3e2ba59 | 716 | do { |
eea7556c MD |
717 | health_code_update(); |
718 | ||
d3e2ba59 | 719 | /* Dequeue commands */ |
8bdee6e2 SM |
720 | node = cds_wfcq_dequeue_blocking(&viewer_conn_queue.head, |
721 | &viewer_conn_queue.tail); | |
d3e2ba59 JD |
722 | if (node == NULL) { |
723 | DBG("Woken up but nothing in the live-viewer " | |
724 | "relay command queue"); | |
725 | /* Continue thread execution */ | |
726 | break; | |
727 | } | |
58eb9381 | 728 | conn = caa_container_of(node, struct relay_connection, qnode); |
d3e2ba59 | 729 | DBG("Dispatching viewer request waiting on sock %d", |
58eb9381 | 730 | conn->sock->fd); |
d3e2ba59 JD |
731 | |
732 | /* | |
7591bab1 MD |
733 | * Inform worker thread of the new request. This |
734 | * call is blocking so we can be assured that | |
735 | * the data will be read at some point in time | |
736 | * or wait to the end of the world :) | |
d3e2ba59 | 737 | */ |
58eb9381 DG |
738 | ret = lttng_write(live_conn_pipe[1], &conn, sizeof(conn)); |
739 | if (ret < 0) { | |
740 | PERROR("write conn pipe"); | |
7591bab1 | 741 | connection_put(conn); |
d3e2ba59 JD |
742 | goto error; |
743 | } | |
744 | } while (node != NULL); | |
745 | ||
746 | /* Futex wait on queue. Blocking call on futex() */ | |
eea7556c | 747 | health_poll_entry(); |
58eb9381 | 748 | futex_nto1_wait(&viewer_conn_queue.futex); |
eea7556c | 749 | health_poll_exit(); |
d3e2ba59 JD |
750 | } |
751 | ||
eea7556c MD |
752 | /* Normal exit, no error */ |
753 | err = 0; | |
754 | ||
d3e2ba59 | 755 | error: |
9b5e0863 | 756 | error_testpoint: |
eea7556c MD |
757 | if (err) { |
758 | health_error(); | |
759 | ERR("Health error occurred in %s", __func__); | |
760 | } | |
761 | health_unregister(health_relayd); | |
d3e2ba59 | 762 | DBG("Live viewer dispatch thread dying"); |
b4aacfdc MD |
763 | if (lttng_relay_stop_threads()) { |
764 | ERR("Error stopping threads"); | |
178a0557 | 765 | } |
d3e2ba59 JD |
766 | return NULL; |
767 | } | |
768 | ||
769 | /* | |
770 | * Establish connection with the viewer and check the versions. | |
771 | * | |
772 | * Return 0 on success or else negative value. | |
773 | */ | |
774 | static | |
58eb9381 | 775 | int viewer_connect(struct relay_connection *conn) |
d3e2ba59 JD |
776 | { |
777 | int ret; | |
778 | struct lttng_viewer_connect reply, msg; | |
779 | ||
58eb9381 | 780 | conn->version_check_done = 1; |
d3e2ba59 | 781 | |
eea7556c MD |
782 | health_code_update(); |
783 | ||
2f8f53af DG |
784 | DBG("Viewer is establishing a connection to the relayd."); |
785 | ||
58eb9381 | 786 | ret = recv_request(conn->sock, &msg, sizeof(msg)); |
2f8f53af | 787 | if (ret < 0) { |
d3e2ba59 JD |
788 | goto end; |
789 | } | |
790 | ||
eea7556c MD |
791 | health_code_update(); |
792 | ||
f46b2ce6 | 793 | memset(&reply, 0, sizeof(reply)); |
d3e2ba59 JD |
794 | reply.major = RELAYD_VERSION_COMM_MAJOR; |
795 | reply.minor = RELAYD_VERSION_COMM_MINOR; | |
796 | ||
797 | /* Major versions must be the same */ | |
798 | if (reply.major != be32toh(msg.major)) { | |
2f8f53af DG |
799 | DBG("Incompatible major versions ([relayd] %u vs [client] %u)", |
800 | reply.major, be32toh(msg.major)); | |
72180669 | 801 | ret = -1; |
d3e2ba59 JD |
802 | goto end; |
803 | } | |
804 | ||
58eb9381 | 805 | conn->major = reply.major; |
d3e2ba59 JD |
806 | /* We adapt to the lowest compatible version */ |
807 | if (reply.minor <= be32toh(msg.minor)) { | |
58eb9381 | 808 | conn->minor = reply.minor; |
d3e2ba59 | 809 | } else { |
58eb9381 | 810 | conn->minor = be32toh(msg.minor); |
d3e2ba59 JD |
811 | } |
812 | ||
c4e361a4 | 813 | if (be32toh(msg.type) == LTTNG_VIEWER_CLIENT_COMMAND) { |
58eb9381 | 814 | conn->type = RELAY_VIEWER_COMMAND; |
c4e361a4 | 815 | } else if (be32toh(msg.type) == LTTNG_VIEWER_CLIENT_NOTIFICATION) { |
58eb9381 | 816 | conn->type = RELAY_VIEWER_NOTIFICATION; |
d3e2ba59 JD |
817 | } else { |
818 | ERR("Unknown connection type : %u", be32toh(msg.type)); | |
819 | ret = -1; | |
820 | goto end; | |
821 | } | |
822 | ||
823 | reply.major = htobe32(reply.major); | |
824 | reply.minor = htobe32(reply.minor); | |
58eb9381 | 825 | if (conn->type == RELAY_VIEWER_COMMAND) { |
93b4787b | 826 | /* |
7591bab1 MD |
827 | * Increment outside of htobe64 macro, because the argument can |
828 | * be used more than once within the macro, and thus the | |
829 | * operation may be undefined. | |
93b4787b | 830 | */ |
7591bab1 | 831 | pthread_mutex_lock(&last_relay_viewer_session_id_lock); |
93b4787b | 832 | last_relay_viewer_session_id++; |
7591bab1 | 833 | pthread_mutex_unlock(&last_relay_viewer_session_id_lock); |
93b4787b | 834 | reply.viewer_session_id = htobe64(last_relay_viewer_session_id); |
d3e2ba59 | 835 | } |
eea7556c MD |
836 | |
837 | health_code_update(); | |
838 | ||
58eb9381 | 839 | ret = send_response(conn->sock, &reply, sizeof(reply)); |
d3e2ba59 | 840 | if (ret < 0) { |
2f8f53af | 841 | goto end; |
d3e2ba59 JD |
842 | } |
843 | ||
eea7556c MD |
844 | health_code_update(); |
845 | ||
58eb9381 | 846 | DBG("Version check done using protocol %u.%u", conn->major, conn->minor); |
d3e2ba59 JD |
847 | ret = 0; |
848 | ||
849 | end: | |
850 | return ret; | |
851 | } | |
852 | ||
853 | /* | |
854 | * Send the viewer the list of current sessions. | |
7591bab1 MD |
855 | * We need to create a copy of the hash table content because otherwise |
856 | * we cannot assume the number of entries stays the same between getting | |
857 | * the number of HT elements and iteration over the HT. | |
d3e2ba59 JD |
858 | * |
859 | * Return 0 on success or else a negative value. | |
860 | */ | |
861 | static | |
58eb9381 | 862 | int viewer_list_sessions(struct relay_connection *conn) |
d3e2ba59 | 863 | { |
5f10c6b1 | 864 | int ret = 0; |
d3e2ba59 | 865 | struct lttng_viewer_list_sessions session_list; |
d3e2ba59 | 866 | struct lttng_ht_iter iter; |
d3e2ba59 | 867 | struct relay_session *session; |
7591bab1 MD |
868 | struct lttng_viewer_session *send_session_buf = NULL; |
869 | uint32_t buf_count = SESSION_BUF_DEFAULT_COUNT; | |
870 | uint32_t count = 0; | |
d3e2ba59 JD |
871 | |
872 | DBG("List sessions received"); | |
873 | ||
7591bab1 MD |
874 | send_session_buf = zmalloc(SESSION_BUF_DEFAULT_COUNT * sizeof(*send_session_buf)); |
875 | if (!send_session_buf) { | |
876 | return -1; | |
d3e2ba59 JD |
877 | } |
878 | ||
7591bab1 MD |
879 | rcu_read_lock(); |
880 | cds_lfht_for_each_entry(sessions_ht->ht, &iter.iter, session, | |
2f8f53af | 881 | session_n.node) { |
7591bab1 | 882 | struct lttng_viewer_session *send_session; |
d3e2ba59 | 883 | |
eea7556c MD |
884 | health_code_update(); |
885 | ||
d995f382 | 886 | pthread_mutex_lock(&session->lock); |
7e0a4379 JR |
887 | if (session->connection_closed) { |
888 | /* Skip closed session */ | |
d995f382 JG |
889 | goto next_session; |
890 | } | |
891 | if (!session->current_trace_chunk) { | |
892 | /* | |
893 | * Skip un-attachable session. It is either | |
894 | * being destroyed or has not had a trace | |
895 | * chunk created against it yet. | |
896 | */ | |
897 | goto next_session; | |
7e0a4379 JR |
898 | } |
899 | ||
7591bab1 MD |
900 | if (count >= buf_count) { |
901 | struct lttng_viewer_session *newbuf; | |
902 | uint32_t new_buf_count = buf_count << 1; | |
eea7556c | 903 | |
7591bab1 MD |
904 | newbuf = realloc(send_session_buf, |
905 | new_buf_count * sizeof(*send_session_buf)); | |
906 | if (!newbuf) { | |
907 | ret = -1; | |
d995f382 | 908 | goto break_loop; |
7591bab1 MD |
909 | } |
910 | send_session_buf = newbuf; | |
911 | buf_count = new_buf_count; | |
6763619c | 912 | } |
7591bab1 | 913 | send_session = &send_session_buf[count]; |
bfc3fb17 MD |
914 | if (lttng_strncpy(send_session->session_name, |
915 | session->session_name, | |
916 | sizeof(send_session->session_name))) { | |
917 | ret = -1; | |
d995f382 | 918 | goto break_loop; |
bfc3fb17 MD |
919 | } |
920 | if (lttng_strncpy(send_session->hostname, session->hostname, | |
921 | sizeof(send_session->hostname))) { | |
922 | ret = -1; | |
d995f382 | 923 | goto break_loop; |
bfc3fb17 | 924 | } |
7591bab1 MD |
925 | send_session->id = htobe64(session->id); |
926 | send_session->live_timer = htobe32(session->live_timer); | |
927 | if (session->viewer_attached) { | |
928 | send_session->clients = htobe32(1); | |
929 | } else { | |
930 | send_session->clients = htobe32(0); | |
d227d5bd | 931 | } |
7591bab1 MD |
932 | send_session->streams = htobe32(session->stream_count); |
933 | count++; | |
d995f382 JG |
934 | next_session: |
935 | pthread_mutex_unlock(&session->lock); | |
936 | continue; | |
937 | break_loop: | |
938 | pthread_mutex_unlock(&session->lock); | |
939 | break; | |
7591bab1 MD |
940 | } |
941 | rcu_read_unlock(); | |
5f10c6b1 JG |
942 | if (ret < 0) { |
943 | goto end_free; | |
944 | } | |
d227d5bd | 945 | |
7591bab1 | 946 | session_list.sessions_count = htobe32(count); |
d227d5bd | 947 | |
7591bab1 | 948 | health_code_update(); |
d227d5bd | 949 | |
7591bab1 MD |
950 | ret = send_response(conn->sock, &session_list, sizeof(session_list)); |
951 | if (ret < 0) { | |
952 | goto end_free; | |
d227d5bd | 953 | } |
d227d5bd | 954 | |
7591bab1 | 955 | health_code_update(); |
d227d5bd | 956 | |
7591bab1 MD |
957 | ret = send_response(conn->sock, send_session_buf, |
958 | count * sizeof(*send_session_buf)); | |
959 | if (ret < 0) { | |
960 | goto end_free; | |
d227d5bd | 961 | } |
7591bab1 | 962 | health_code_update(); |
d227d5bd | 963 | |
7591bab1 MD |
964 | ret = 0; |
965 | end_free: | |
966 | free(send_session_buf); | |
967 | return ret; | |
d227d5bd JD |
968 | } |
969 | ||
80e8027a | 970 | /* |
7591bab1 | 971 | * Send the viewer the list of current streams. |
80e8027a JD |
972 | */ |
973 | static | |
58eb9381 | 974 | int viewer_get_new_streams(struct relay_connection *conn) |
80e8027a JD |
975 | { |
976 | int ret, send_streams = 0; | |
7591bab1 | 977 | uint32_t nb_created = 0, nb_unsent = 0, nb_streams = 0, nb_total = 0; |
80e8027a JD |
978 | struct lttng_viewer_new_streams_request request; |
979 | struct lttng_viewer_new_streams_response response; | |
b66a15d1 | 980 | struct relay_session *session = NULL; |
6763619c | 981 | uint64_t session_id; |
bddf80e4 | 982 | bool closed = false; |
80e8027a | 983 | |
58eb9381 | 984 | assert(conn); |
80e8027a JD |
985 | |
986 | DBG("Get new streams received"); | |
987 | ||
80e8027a JD |
988 | health_code_update(); |
989 | ||
2f8f53af | 990 | /* Receive the request from the connected client. */ |
58eb9381 | 991 | ret = recv_request(conn->sock, &request, sizeof(request)); |
2f8f53af | 992 | if (ret < 0) { |
80e8027a JD |
993 | goto error; |
994 | } | |
6763619c | 995 | session_id = be64toh(request.session_id); |
80e8027a JD |
996 | |
997 | health_code_update(); | |
998 | ||
53efb85a MD |
999 | memset(&response, 0, sizeof(response)); |
1000 | ||
7591bab1 | 1001 | session = session_get_by_id(session_id); |
2f8f53af | 1002 | if (!session) { |
6763619c | 1003 | DBG("Relay session %" PRIu64 " not found", session_id); |
c4e361a4 | 1004 | response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_ERR); |
80e8027a JD |
1005 | goto send_reply; |
1006 | } | |
1007 | ||
7591bab1 | 1008 | if (!viewer_session_is_attached(conn->viewer_session, session)) { |
c4e361a4 | 1009 | response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_ERR); |
80e8027a JD |
1010 | goto send_reply; |
1011 | } | |
1012 | ||
c06fdd95 | 1013 | pthread_mutex_lock(&session->lock); |
b66a15d1 JG |
1014 | ret = make_viewer_streams(session, |
1015 | conn->viewer_session->current_trace_chunk, | |
1016 | LTTNG_VIEWER_SEEK_LAST, &nb_total, &nb_unsent, | |
bddf80e4 | 1017 | &nb_created, &closed); |
2f8f53af | 1018 | if (ret < 0) { |
b66a15d1 | 1019 | goto error_unlock_session; |
2f8f53af | 1020 | } |
3d0bbd40 JG |
1021 | send_streams = 1; |
1022 | response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_OK); | |
b66a15d1 | 1023 | |
2f8f53af DG |
1024 | /* Only send back the newly created streams with the unsent ones. */ |
1025 | nb_streams = nb_created + nb_unsent; | |
80e8027a JD |
1026 | response.streams_count = htobe32(nb_streams); |
1027 | ||
4479f682 | 1028 | /* |
2229a09c MD |
1029 | * If the session is closed, HUP when there are no more streams |
1030 | * with data. | |
4479f682 | 1031 | */ |
bddf80e4 | 1032 | if (closed && nb_total == 0) { |
4479f682 | 1033 | send_streams = 0; |
bddf80e4 | 1034 | response.streams_count = 0; |
4479f682 | 1035 | response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_HUP); |
3d0bbd40 | 1036 | goto send_reply_unlock; |
4479f682 | 1037 | } |
3d0bbd40 JG |
1038 | send_reply_unlock: |
1039 | pthread_mutex_unlock(&session->lock); | |
4479f682 | 1040 | |
80e8027a JD |
1041 | send_reply: |
1042 | health_code_update(); | |
58eb9381 | 1043 | ret = send_response(conn->sock, &response, sizeof(response)); |
80e8027a | 1044 | if (ret < 0) { |
7591bab1 | 1045 | goto end_put_session; |
80e8027a JD |
1046 | } |
1047 | health_code_update(); | |
1048 | ||
1049 | /* | |
7591bab1 MD |
1050 | * Unknown or empty session, just return gracefully, the viewer |
1051 | * knows what is happening. | |
80e8027a JD |
1052 | */ |
1053 | if (!send_streams || !nb_streams) { | |
1054 | ret = 0; | |
7591bab1 | 1055 | goto end_put_session; |
80e8027a JD |
1056 | } |
1057 | ||
2f8f53af | 1058 | /* |
7591bab1 MD |
1059 | * Send stream and *DON'T* ignore the sent flag so every viewer |
1060 | * streams that were not sent from that point will be sent to | |
1061 | * the viewer. | |
2f8f53af | 1062 | */ |
c06fdd95 | 1063 | ret = send_viewer_streams(conn->sock, session_id, 0); |
2f8f53af | 1064 | if (ret < 0) { |
7591bab1 | 1065 | goto end_put_session; |
80e8027a JD |
1066 | } |
1067 | ||
7591bab1 MD |
1068 | end_put_session: |
1069 | if (session) { | |
1070 | session_put(session); | |
1071 | } | |
80e8027a JD |
1072 | error: |
1073 | return ret; | |
b66a15d1 JG |
1074 | error_unlock_session: |
1075 | pthread_mutex_unlock(&session->lock); | |
1076 | session_put(session); | |
1077 | return ret; | |
80e8027a JD |
1078 | } |
1079 | ||
d3e2ba59 JD |
1080 | /* |
1081 | * Send the viewer the list of current sessions. | |
1082 | */ | |
1083 | static | |
58eb9381 | 1084 | int viewer_attach_session(struct relay_connection *conn) |
d3e2ba59 | 1085 | { |
2f8f53af DG |
1086 | int send_streams = 0; |
1087 | ssize_t ret; | |
80e8027a | 1088 | uint32_t nb_streams = 0; |
2f8f53af | 1089 | enum lttng_viewer_seek seek_type; |
d3e2ba59 JD |
1090 | struct lttng_viewer_attach_session_request request; |
1091 | struct lttng_viewer_attach_session_response response; | |
7591bab1 | 1092 | struct relay_session *session = NULL; |
dbd6665b | 1093 | enum lttng_viewer_attach_return_code viewer_attach_status; |
bddf80e4 | 1094 | bool closed = false; |
c06fdd95 | 1095 | uint64_t session_id; |
d3e2ba59 | 1096 | |
58eb9381 | 1097 | assert(conn); |
d3e2ba59 | 1098 | |
eea7556c MD |
1099 | health_code_update(); |
1100 | ||
2f8f53af | 1101 | /* Receive the request from the connected client. */ |
58eb9381 | 1102 | ret = recv_request(conn->sock, &request, sizeof(request)); |
2f8f53af | 1103 | if (ret < 0) { |
d3e2ba59 JD |
1104 | goto error; |
1105 | } | |
1106 | ||
c06fdd95 | 1107 | session_id = be64toh(request.session_id); |
eea7556c MD |
1108 | health_code_update(); |
1109 | ||
53efb85a MD |
1110 | memset(&response, 0, sizeof(response)); |
1111 | ||
c3b7390b JD |
1112 | if (!conn->viewer_session) { |
1113 | DBG("Client trying to attach before creating a live viewer session"); | |
1114 | response.status = htobe32(LTTNG_VIEWER_ATTACH_NO_SESSION); | |
1115 | goto send_reply; | |
1116 | } | |
1117 | ||
c06fdd95 | 1118 | session = session_get_by_id(session_id); |
2f8f53af | 1119 | if (!session) { |
c06fdd95 | 1120 | DBG("Relay session %" PRIu64 " not found", session_id); |
c4e361a4 | 1121 | response.status = htobe32(LTTNG_VIEWER_ATTACH_UNK); |
d3e2ba59 JD |
1122 | goto send_reply; |
1123 | } | |
c06fdd95 | 1124 | DBG("Attach session ID %" PRIu64 " received", session_id); |
d3e2ba59 | 1125 | |
c06fdd95 | 1126 | pthread_mutex_lock(&session->lock); |
79a42980 JG |
1127 | if (!session->current_trace_chunk) { |
1128 | /* | |
1129 | * Session is either being destroyed or it never had a trace | |
1130 | * chunk created against it. | |
1131 | */ | |
1132 | DBG("Session requested by live client has no current trace chunk, returning unknown session"); | |
1133 | response.status = htobe32(LTTNG_VIEWER_ATTACH_UNK); | |
1134 | goto send_reply; | |
1135 | } | |
7591bab1 | 1136 | if (session->live_timer == 0) { |
d3e2ba59 | 1137 | DBG("Not live session"); |
c4e361a4 | 1138 | response.status = htobe32(LTTNG_VIEWER_ATTACH_NOT_LIVE); |
d3e2ba59 | 1139 | goto send_reply; |
7591bab1 MD |
1140 | } |
1141 | ||
1142 | send_streams = 1; | |
dbd6665b JG |
1143 | viewer_attach_status = viewer_session_attach(conn->viewer_session, |
1144 | session); | |
1145 | if (viewer_attach_status != LTTNG_VIEWER_ATTACH_OK) { | |
1146 | response.status = htobe32(viewer_attach_status); | |
7591bab1 | 1147 | goto send_reply; |
d3e2ba59 JD |
1148 | } |
1149 | ||
1150 | switch (be32toh(request.seek)) { | |
c4e361a4 JD |
1151 | case LTTNG_VIEWER_SEEK_BEGINNING: |
1152 | case LTTNG_VIEWER_SEEK_LAST: | |
7591bab1 | 1153 | response.status = htobe32(LTTNG_VIEWER_ATTACH_OK); |
2f8f53af | 1154 | seek_type = be32toh(request.seek); |
d3e2ba59 JD |
1155 | break; |
1156 | default: | |
1157 | ERR("Wrong seek parameter"); | |
c4e361a4 | 1158 | response.status = htobe32(LTTNG_VIEWER_ATTACH_SEEK_ERR); |
d3e2ba59 JD |
1159 | send_streams = 0; |
1160 | goto send_reply; | |
1161 | } | |
1162 | ||
b66a15d1 JG |
1163 | ret = make_viewer_streams(session, |
1164 | conn->viewer_session->current_trace_chunk, seek_type, | |
1165 | &nb_streams, NULL, NULL, &closed); | |
2f8f53af | 1166 | if (ret < 0) { |
7591bab1 | 1167 | goto end_put_session; |
d3e2ba59 | 1168 | } |
c06fdd95 JG |
1169 | pthread_mutex_unlock(&session->lock); |
1170 | session_put(session); | |
1171 | session = NULL; | |
1172 | ||
1173 | response.streams_count = htobe32(nb_streams); | |
bddf80e4 MD |
1174 | /* |
1175 | * If the session is closed when the viewer is attaching, it | |
1176 | * means some of the streams may have been concurrently removed, | |
1177 | * so we don't allow the viewer to attach, even if there are | |
1178 | * streams available. | |
1179 | */ | |
1180 | if (closed) { | |
1181 | send_streams = 0; | |
1182 | response.streams_count = 0; | |
06079f15 | 1183 | response.status = htobe32(LTTNG_VIEWER_ATTACH_UNK); |
bddf80e4 MD |
1184 | goto send_reply; |
1185 | } | |
1186 | ||
d3e2ba59 | 1187 | send_reply: |
eea7556c | 1188 | health_code_update(); |
58eb9381 | 1189 | ret = send_response(conn->sock, &response, sizeof(response)); |
d3e2ba59 | 1190 | if (ret < 0) { |
7591bab1 | 1191 | goto end_put_session; |
d3e2ba59 | 1192 | } |
eea7556c | 1193 | health_code_update(); |
d3e2ba59 JD |
1194 | |
1195 | /* | |
7591bab1 MD |
1196 | * Unknown or empty session, just return gracefully, the viewer |
1197 | * knows what is happening. | |
d3e2ba59 | 1198 | */ |
157df586 | 1199 | if (!send_streams || !nb_streams) { |
d3e2ba59 | 1200 | ret = 0; |
7591bab1 | 1201 | goto end_put_session; |
d3e2ba59 JD |
1202 | } |
1203 | ||
2f8f53af | 1204 | /* Send stream and ignore the sent flag. */ |
c06fdd95 | 1205 | ret = send_viewer_streams(conn->sock, session_id, 1); |
2f8f53af | 1206 | if (ret < 0) { |
7591bab1 | 1207 | goto end_put_session; |
d3e2ba59 | 1208 | } |
d3e2ba59 | 1209 | |
7591bab1 MD |
1210 | end_put_session: |
1211 | if (session) { | |
c06fdd95 | 1212 | pthread_mutex_unlock(&session->lock); |
7591bab1 MD |
1213 | session_put(session); |
1214 | } | |
4a9daf17 JD |
1215 | error: |
1216 | return ret; | |
1217 | } | |
1218 | ||
878c34cf DG |
1219 | /* |
1220 | * Open the index file if needed for the given vstream. | |
1221 | * | |
f8f3885c MD |
1222 | * If an index file is successfully opened, the vstream will set it as its |
1223 | * current index file. | |
878c34cf DG |
1224 | * |
1225 | * Return 0 on success, a negative value on error (-ENOENT if not ready yet). | |
7591bab1 MD |
1226 | * |
1227 | * Called with rstream lock held. | |
878c34cf DG |
1228 | */ |
1229 | static int try_open_index(struct relay_viewer_stream *vstream, | |
1230 | struct relay_stream *rstream) | |
1231 | { | |
1232 | int ret = 0; | |
ebb29c10 JG |
1233 | const uint32_t connection_major = rstream->trace->session->major; |
1234 | const uint32_t connection_minor = rstream->trace->session->minor; | |
3ff5c5db | 1235 | enum lttng_trace_chunk_status chunk_status; |
878c34cf | 1236 | |
f8f3885c | 1237 | if (vstream->index_file) { |
878c34cf DG |
1238 | goto end; |
1239 | } | |
1240 | ||
1241 | /* | |
7591bab1 | 1242 | * First time, we open the index file and at least one index is ready. |
878c34cf | 1243 | */ |
a44ca2ca | 1244 | if (rstream->index_received_seqcount == 0) { |
878c34cf DG |
1245 | ret = -ENOENT; |
1246 | goto end; | |
1247 | } | |
3ff5c5db | 1248 | chunk_status = lttng_index_file_create_from_trace_chunk_read_only( |
b66a15d1 | 1249 | vstream->stream_file.trace_chunk, rstream->path_name, |
ebb29c10 JG |
1250 | rstream->channel_name, rstream->tracefile_size, |
1251 | vstream->current_tracefile_id, | |
1252 | lttng_to_index_major(connection_major, connection_minor), | |
3ff5c5db MD |
1253 | lttng_to_index_minor(connection_major, connection_minor), |
1254 | true, &vstream->index_file); | |
1255 | if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { | |
1256 | if (chunk_status == LTTNG_TRACE_CHUNK_STATUS_NO_FILE) { | |
1257 | ret = -ENOENT; | |
1258 | } else { | |
1259 | ret = -1; | |
1260 | } | |
878c34cf DG |
1261 | } |
1262 | ||
1263 | end: | |
1264 | return ret; | |
1265 | } | |
1266 | ||
1267 | /* | |
7591bab1 MD |
1268 | * Check the status of the index for the given stream. This function |
1269 | * updates the index structure if needed and can put (close) the vstream | |
1270 | * in the HUP situation. | |
1271 | * | |
1272 | * Return 0 means that we can proceed with the index. A value of 1 means | |
1273 | * that the index has been updated and is ready to be sent to the | |
1274 | * client. A negative value indicates an error that can't be handled. | |
878c34cf | 1275 | * |
7591bab1 | 1276 | * Called with rstream lock held. |
878c34cf DG |
1277 | */ |
1278 | static int check_index_status(struct relay_viewer_stream *vstream, | |
1279 | struct relay_stream *rstream, struct ctf_trace *trace, | |
1280 | struct lttng_viewer_index *index) | |
1281 | { | |
1282 | int ret; | |
1283 | ||
68c40154 MD |
1284 | DBG("Check index status: index_received_seqcount %" PRIu64 " " |
1285 | "index_sent_seqcount %" PRIu64 " " | |
1286 | "for stream %" PRIu64, | |
1287 | rstream->index_received_seqcount, | |
1288 | vstream->index_sent_seqcount, | |
1289 | vstream->stream->stream_handle); | |
797bc362 | 1290 | if ((trace->session->connection_closed || rstream->closed) |
a44ca2ca MD |
1291 | && rstream->index_received_seqcount |
1292 | == vstream->index_sent_seqcount) { | |
797bc362 MD |
1293 | /* |
1294 | * Last index sent and session connection or relay | |
1295 | * stream are closed. | |
1296 | */ | |
7591bab1 MD |
1297 | index->status = htobe32(LTTNG_VIEWER_INDEX_HUP); |
1298 | goto hup; | |
1299 | } else if (rstream->beacon_ts_end != -1ULL && | |
b0d240a2 MD |
1300 | (rstream->index_received_seqcount == 0 || |
1301 | (vstream->index_sent_seqcount != 0 && | |
a44ca2ca | 1302 | rstream->index_received_seqcount |
b0d240a2 | 1303 | <= vstream->index_sent_seqcount))) { |
7591bab1 MD |
1304 | /* |
1305 | * We've received a synchronization beacon and the last index | |
1306 | * available has been sent, the index for now is inactive. | |
1307 | * | |
1308 | * In this case, we have received a beacon which allows us to | |
1309 | * inform the client of a time interval during which we can | |
1310 | * guarantee that there are no events to read (and never will | |
1311 | * be). | |
b0d240a2 MD |
1312 | * |
1313 | * The sent seqcount can grow higher than receive seqcount on | |
1314 | * clear because the rotation performed by clear will push | |
1315 | * the index_sent_seqcount ahead (see | |
1316 | * viewer_stream_sync_tracefile_array_tail) and skip over | |
1317 | * packet sequence numbers. | |
7591bab1 MD |
1318 | */ |
1319 | index->status = htobe32(LTTNG_VIEWER_INDEX_INACTIVE); | |
1320 | index->timestamp_end = htobe64(rstream->beacon_ts_end); | |
1321 | index->stream_id = htobe64(rstream->ctf_stream_id); | |
68c40154 MD |
1322 | DBG("Check index status: inactive with beacon, for stream %" PRIu64, |
1323 | vstream->stream->stream_handle); | |
7591bab1 | 1324 | goto index_ready; |
b0d240a2 MD |
1325 | } else if (rstream->index_received_seqcount == 0 || |
1326 | (vstream->index_sent_seqcount != 0 && | |
1327 | rstream->index_received_seqcount | |
1328 | <= vstream->index_sent_seqcount)) { | |
7591bab1 | 1329 | /* |
b0d240a2 | 1330 | * This checks whether received <= sent seqcount. In |
a44ca2ca MD |
1331 | * this case, we have not received a beacon. Therefore, |
1332 | * we can only ask the client to retry later. | |
b0d240a2 MD |
1333 | * |
1334 | * The sent seqcount can grow higher than receive seqcount on | |
1335 | * clear because the rotation performed by clear will push | |
1336 | * the index_sent_seqcount ahead (see | |
1337 | * viewer_stream_sync_tracefile_array_tail) and skip over | |
1338 | * packet sequence numbers. | |
7591bab1 MD |
1339 | */ |
1340 | index->status = htobe32(LTTNG_VIEWER_INDEX_RETRY); | |
68c40154 MD |
1341 | DBG("Check index status: retry for stream %" PRIu64, |
1342 | vstream->stream->stream_handle); | |
7591bab1 | 1343 | goto index_ready; |
a44ca2ca MD |
1344 | } else if (!tracefile_array_seq_in_file(rstream->tfa, |
1345 | vstream->current_tracefile_id, | |
1346 | vstream->index_sent_seqcount)) { | |
7591bab1 | 1347 | /* |
a44ca2ca MD |
1348 | * The next index we want to send cannot be read either |
1349 | * because we need to perform a rotation, or due to | |
1350 | * the producer having overwritten its trace file. | |
7591bab1 | 1351 | */ |
a44ca2ca | 1352 | DBG("Viewer stream %" PRIu64 " rotation", |
7591bab1 MD |
1353 | vstream->stream->stream_handle); |
1354 | ret = viewer_stream_rotate(vstream); | |
b0d240a2 | 1355 | if (ret == 1) { |
7591bab1 MD |
1356 | /* EOF across entire stream. */ |
1357 | index->status = htobe32(LTTNG_VIEWER_INDEX_HUP); | |
1358 | goto hup; | |
1359 | } | |
7591bab1 | 1360 | /* |
a44ca2ca MD |
1361 | * If we have been pushed due to overwrite, it |
1362 | * necessarily means there is data that can be read in | |
1363 | * the stream. If we rotated because we reached the end | |
1364 | * of a tracefile, it means the following tracefile | |
1365 | * needs to contain at least one index, else we would | |
1366 | * have already returned LTTNG_VIEWER_INDEX_RETRY to the | |
1367 | * viewer. The updated index_sent_seqcount needs to | |
1368 | * point to a readable index entry now. | |
1369 | * | |
1370 | * In the case where we "rotate" on a single file, we | |
1371 | * can end up in a case where the requested index is | |
1372 | * still unavailable. | |
7591bab1 | 1373 | */ |
a44ca2ca MD |
1374 | if (rstream->tracefile_count == 1 && |
1375 | !tracefile_array_seq_in_file( | |
1376 | rstream->tfa, | |
1377 | vstream->current_tracefile_id, | |
1378 | vstream->index_sent_seqcount)) { | |
1379 | index->status = htobe32(LTTNG_VIEWER_INDEX_RETRY); | |
68c40154 MD |
1380 | DBG("Check index status: retry: " |
1381 | "tracefile array sequence number %" PRIu64 | |
1382 | " not in file for stream %" PRIu64, | |
1383 | vstream->index_sent_seqcount, | |
1384 | vstream->stream->stream_handle); | |
a44ca2ca | 1385 | goto index_ready; |
878c34cf | 1386 | } |
a44ca2ca MD |
1387 | assert(tracefile_array_seq_in_file(rstream->tfa, |
1388 | vstream->current_tracefile_id, | |
1389 | vstream->index_sent_seqcount)); | |
878c34cf | 1390 | } |
a44ca2ca MD |
1391 | /* ret == 0 means successful so we continue. */ |
1392 | ret = 0; | |
878c34cf DG |
1393 | return ret; |
1394 | ||
1395 | hup: | |
7591bab1 | 1396 | viewer_stream_put(vstream); |
878c34cf DG |
1397 | index_ready: |
1398 | return 1; | |
1399 | } | |
1400 | ||
d3e2ba59 JD |
1401 | /* |
1402 | * Send the next index for a stream. | |
1403 | * | |
1404 | * Return 0 on success or else a negative value. | |
1405 | */ | |
1406 | static | |
58eb9381 | 1407 | int viewer_get_next_index(struct relay_connection *conn) |
d3e2ba59 JD |
1408 | { |
1409 | int ret; | |
1410 | struct lttng_viewer_get_next_index request_index; | |
1411 | struct lttng_viewer_index viewer_index; | |
50adc264 | 1412 | struct ctf_packet_index packet_index; |
7591bab1 MD |
1413 | struct relay_viewer_stream *vstream = NULL; |
1414 | struct relay_stream *rstream = NULL; | |
1415 | struct ctf_trace *ctf_trace = NULL; | |
1416 | struct relay_viewer_stream *metadata_viewer_stream = NULL; | |
d3e2ba59 | 1417 | |
58eb9381 | 1418 | assert(conn); |
d3e2ba59 JD |
1419 | |
1420 | DBG("Viewer get next index"); | |
1421 | ||
7591bab1 | 1422 | memset(&viewer_index, 0, sizeof(viewer_index)); |
eea7556c | 1423 | health_code_update(); |
2f8f53af | 1424 | |
58eb9381 | 1425 | ret = recv_request(conn->sock, &request_index, sizeof(request_index)); |
2f8f53af | 1426 | if (ret < 0) { |
d3e2ba59 JD |
1427 | goto end; |
1428 | } | |
eea7556c | 1429 | health_code_update(); |
d3e2ba59 | 1430 | |
7591bab1 | 1431 | vstream = viewer_stream_get_by_id(be64toh(request_index.stream_id)); |
6763619c | 1432 | if (!vstream) { |
a44ca2ca | 1433 | DBG("Client requested index of unknown stream id %" PRIu64, |
9b9f9f94 | 1434 | (uint64_t) be64toh(request_index.stream_id)); |
f1883937 MD |
1435 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR); |
1436 | goto send_reply; | |
2a174661 DG |
1437 | } |
1438 | ||
7591bab1 MD |
1439 | /* Use back. ref. Protected by refcounts. */ |
1440 | rstream = vstream->stream; | |
1441 | ctf_trace = rstream->trace; | |
d3e2ba59 | 1442 | |
7591bab1 MD |
1443 | /* metadata_viewer_stream may be NULL. */ |
1444 | metadata_viewer_stream = | |
1445 | ctf_trace_get_viewer_metadata_stream(ctf_trace); | |
2a174661 | 1446 | |
7591bab1 | 1447 | pthread_mutex_lock(&rstream->lock); |
d3e2ba59 JD |
1448 | |
1449 | /* | |
1450 | * The viewer should not ask for index on metadata stream. | |
1451 | */ | |
7591bab1 | 1452 | if (rstream->is_metadata) { |
c4e361a4 | 1453 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_HUP); |
d3e2ba59 JD |
1454 | goto send_reply; |
1455 | } | |
1456 | ||
b0d240a2 MD |
1457 | if (rstream->ongoing_rotation.is_set) { |
1458 | /* Rotation is ongoing, try again later. */ | |
1459 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_RETRY); | |
1460 | goto send_reply; | |
1461 | } | |
1462 | ||
1463 | if (rstream->trace->session->ongoing_rotation) { | |
1464 | /* Rotation is ongoing, try again later. */ | |
1465 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_RETRY); | |
1466 | goto send_reply; | |
1467 | } | |
1468 | ||
1469 | if (rstream->trace_chunk) { | |
1470 | uint64_t rchunk_id, vchunk_id; | |
1471 | ||
1472 | /* | |
1473 | * If the relay stream is not yet closed, ensure the viewer | |
1474 | * chunk matches the relay chunk after clear. | |
1475 | */ | |
1476 | if (lttng_trace_chunk_get_id(rstream->trace_chunk, | |
1477 | &rchunk_id) != LTTNG_TRACE_CHUNK_STATUS_OK) { | |
c4e361a4 | 1478 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR); |
b0d240a2 MD |
1479 | goto send_reply; |
1480 | } | |
1481 | if (lttng_trace_chunk_get_id( | |
1482 | conn->viewer_session->current_trace_chunk, | |
1483 | &vchunk_id) != LTTNG_TRACE_CHUNK_STATUS_OK) { | |
1484 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR); | |
1485 | goto send_reply; | |
1486 | } | |
1487 | ||
1488 | if (rchunk_id != vchunk_id) { | |
1489 | DBG("Relay and viewer chunk ids differ: " | |
1490 | "rchunk_id %" PRIu64 " vchunk_id %" PRIu64, | |
1491 | rchunk_id, vchunk_id); | |
1492 | ||
1493 | lttng_trace_chunk_put( | |
1494 | conn->viewer_session->current_trace_chunk); | |
1495 | conn->viewer_session->current_trace_chunk = NULL; | |
1496 | ret = viewer_session_set_trace_chunk_copy( | |
1497 | conn->viewer_session, | |
1498 | rstream->trace_chunk); | |
1499 | if (ret) { | |
1500 | viewer_index.status = | |
1501 | htobe32(LTTNG_VIEWER_INDEX_ERR); | |
1502 | goto send_reply; | |
1503 | } | |
d3e2ba59 | 1504 | } |
b0d240a2 MD |
1505 | } |
1506 | if (conn->viewer_session->current_trace_chunk != | |
1507 | vstream->stream_file.trace_chunk) { | |
1508 | bool acquired_reference; | |
1509 | ||
1510 | DBG("Viewer session and viewer stream chunk differ: " | |
1511 | "vsession chunk %p vstream chunk %p", | |
1512 | conn->viewer_session->current_trace_chunk, | |
1513 | vstream->stream_file.trace_chunk); | |
1514 | lttng_trace_chunk_put(vstream->stream_file.trace_chunk); | |
1515 | acquired_reference = lttng_trace_chunk_get(conn->viewer_session->current_trace_chunk); | |
1516 | assert(acquired_reference); | |
1517 | vstream->stream_file.trace_chunk = | |
1518 | conn->viewer_session->current_trace_chunk; | |
1519 | viewer_stream_sync_tracefile_array_tail(vstream); | |
1520 | viewer_stream_close_files(vstream); | |
d3e2ba59 JD |
1521 | } |
1522 | ||
878c34cf | 1523 | ret = check_index_status(vstream, rstream, ctf_trace, &viewer_index); |
878c34cf | 1524 | if (ret < 0) { |
7591bab1 | 1525 | goto error_put; |
878c34cf DG |
1526 | } else if (ret == 1) { |
1527 | /* | |
7591bab1 MD |
1528 | * We have no index to send and check_index_status has populated |
1529 | * viewer_index's status. | |
878c34cf | 1530 | */ |
d3e2ba59 JD |
1531 | goto send_reply; |
1532 | } | |
7591bab1 | 1533 | /* At this point, ret is 0 thus we will be able to read the index. */ |
878c34cf | 1534 | assert(!ret); |
d3e2ba59 | 1535 | |
b0d240a2 MD |
1536 | /* Try to open an index if one is needed for that stream. */ |
1537 | ret = try_open_index(vstream, rstream); | |
1538 | if (ret == -ENOENT) { | |
1539 | if (rstream->closed) { | |
1540 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_HUP); | |
1541 | goto send_reply; | |
1542 | } else { | |
1543 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_RETRY); | |
1544 | goto send_reply; | |
1545 | } | |
1546 | } | |
1547 | if (ret < 0) { | |
1548 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR); | |
1549 | goto send_reply; | |
1550 | } | |
1551 | ||
7591bab1 MD |
1552 | /* |
1553 | * vstream->stream_fd may be NULL if it has been closed by | |
1554 | * tracefile rotation, or if we are at the beginning of the | |
1555 | * stream. We open the data stream file here to protect against | |
1556 | * overwrite caused by tracefile rotation (in association with | |
1557 | * unlink performed before overwrite). | |
1558 | */ | |
ebb29c10 JG |
1559 | if (!vstream->stream_file.fd) { |
1560 | int fd; | |
1561 | char file_path[LTTNG_PATH_MAX]; | |
1562 | enum lttng_trace_chunk_status status; | |
1563 | ||
1564 | ret = utils_stream_file_path(rstream->path_name, | |
1565 | rstream->channel_name, rstream->tracefile_size, | |
1566 | vstream->current_tracefile_id, NULL, file_path, | |
1567 | sizeof(file_path)); | |
7591bab1 MD |
1568 | if (ret < 0) { |
1569 | goto error_put; | |
1570 | } | |
ebb29c10 | 1571 | |
3ff5c5db MD |
1572 | /* |
1573 | * It is possible the the file we are trying to open is | |
1574 | * missing if the stream has been closed (application exits with | |
1575 | * per-pid buffers) and a clear command has been performed. | |
1576 | */ | |
ebb29c10 JG |
1577 | status = lttng_trace_chunk_open_file( |
1578 | vstream->stream_file.trace_chunk, | |
3ff5c5db | 1579 | file_path, O_RDONLY, 0, &fd, true); |
ebb29c10 | 1580 | if (status != LTTNG_TRACE_CHUNK_STATUS_OK) { |
b0d240a2 MD |
1581 | if (status == LTTNG_TRACE_CHUNK_STATUS_NO_FILE && |
1582 | rstream->closed) { | |
1583 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_HUP); | |
1584 | goto send_reply; | |
1585 | } | |
ebb29c10 | 1586 | PERROR("Failed to open trace file for viewer stream"); |
7591bab1 MD |
1587 | goto error_put; |
1588 | } | |
ebb29c10 JG |
1589 | vstream->stream_file.fd = stream_fd_create(fd); |
1590 | if (!vstream->stream_file.fd) { | |
1591 | if (close(fd)) { | |
1592 | PERROR("Failed to close viewer stream file"); | |
7591bab1 MD |
1593 | } |
1594 | goto error_put; | |
1595 | } | |
d3e2ba59 JD |
1596 | } |
1597 | ||
f04a971b | 1598 | ret = check_new_streams(conn); |
4a9daf17 | 1599 | if (ret < 0) { |
7591bab1 MD |
1600 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR); |
1601 | goto send_reply; | |
4a9daf17 JD |
1602 | } else if (ret == 1) { |
1603 | viewer_index.flags |= LTTNG_VIEWER_FLAG_NEW_STREAM; | |
1604 | } | |
1605 | ||
f8f3885c MD |
1606 | ret = lttng_index_file_read(vstream->index_file, &packet_index); |
1607 | if (ret) { | |
1608 | ERR("Relay error reading index file %d", | |
1609 | vstream->index_file->fd); | |
7591bab1 | 1610 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR); |
6b6b9a5a | 1611 | goto send_reply; |
d3e2ba59 | 1612 | } else { |
c4e361a4 | 1613 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_OK); |
a44ca2ca | 1614 | vstream->index_sent_seqcount++; |
d3e2ba59 JD |
1615 | } |
1616 | ||
1617 | /* | |
1618 | * Indexes are stored in big endian, no need to switch before sending. | |
1619 | */ | |
7591bab1 MD |
1620 | DBG("Sending viewer index for stream %" PRIu64 " offset %" PRIu64, |
1621 | rstream->stream_handle, | |
9b9f9f94 | 1622 | (uint64_t) be64toh(packet_index.offset)); |
d3e2ba59 JD |
1623 | viewer_index.offset = packet_index.offset; |
1624 | viewer_index.packet_size = packet_index.packet_size; | |
1625 | viewer_index.content_size = packet_index.content_size; | |
1626 | viewer_index.timestamp_begin = packet_index.timestamp_begin; | |
1627 | viewer_index.timestamp_end = packet_index.timestamp_end; | |
1628 | viewer_index.events_discarded = packet_index.events_discarded; | |
1629 | viewer_index.stream_id = packet_index.stream_id; | |
1630 | ||
1631 | send_reply: | |
f1883937 MD |
1632 | if (rstream) { |
1633 | pthread_mutex_unlock(&rstream->lock); | |
1634 | } | |
7591bab1 MD |
1635 | |
1636 | if (metadata_viewer_stream) { | |
1637 | pthread_mutex_lock(&metadata_viewer_stream->stream->lock); | |
1638 | DBG("get next index metadata check: recv %" PRIu64 | |
1639 | " sent %" PRIu64, | |
1640 | metadata_viewer_stream->stream->metadata_received, | |
1641 | metadata_viewer_stream->metadata_sent); | |
1642 | if (!metadata_viewer_stream->stream->metadata_received || | |
1643 | metadata_viewer_stream->stream->metadata_received > | |
1644 | metadata_viewer_stream->metadata_sent) { | |
1645 | viewer_index.flags |= LTTNG_VIEWER_FLAG_NEW_METADATA; | |
1646 | } | |
1647 | pthread_mutex_unlock(&metadata_viewer_stream->stream->lock); | |
1648 | } | |
1649 | ||
d3e2ba59 | 1650 | viewer_index.flags = htobe32(viewer_index.flags); |
eea7556c | 1651 | health_code_update(); |
2f8f53af | 1652 | |
58eb9381 | 1653 | ret = send_response(conn->sock, &viewer_index, sizeof(viewer_index)); |
d3e2ba59 | 1654 | if (ret < 0) { |
7591bab1 | 1655 | goto end; |
d3e2ba59 | 1656 | } |
eea7556c | 1657 | health_code_update(); |
d3e2ba59 | 1658 | |
9237e6a1 MD |
1659 | if (vstream) { |
1660 | DBG("Index %" PRIu64 " for stream %" PRIu64 " sent", | |
a44ca2ca | 1661 | vstream->index_sent_seqcount, |
9237e6a1 MD |
1662 | vstream->stream->stream_handle); |
1663 | } | |
d3e2ba59 | 1664 | end: |
7591bab1 MD |
1665 | if (metadata_viewer_stream) { |
1666 | viewer_stream_put(metadata_viewer_stream); | |
1667 | } | |
1668 | if (vstream) { | |
1669 | viewer_stream_put(vstream); | |
1670 | } | |
1671 | return ret; | |
1672 | ||
1673 | error_put: | |
1674 | pthread_mutex_unlock(&rstream->lock); | |
1675 | if (metadata_viewer_stream) { | |
1676 | viewer_stream_put(metadata_viewer_stream); | |
1677 | } | |
1678 | viewer_stream_put(vstream); | |
d3e2ba59 JD |
1679 | return ret; |
1680 | } | |
1681 | ||
1682 | /* | |
1683 | * Send the next index for a stream | |
1684 | * | |
1685 | * Return 0 on success or else a negative value. | |
1686 | */ | |
1687 | static | |
58eb9381 | 1688 | int viewer_get_packet(struct relay_connection *conn) |
d3e2ba59 | 1689 | { |
b6025e94 | 1690 | int ret; |
a5df8828 | 1691 | off_t lseek_ret; |
553b2adb | 1692 | char *reply = NULL; |
d3e2ba59 | 1693 | struct lttng_viewer_get_packet get_packet_info; |
553b2adb | 1694 | struct lttng_viewer_trace_packet reply_header; |
7591bab1 | 1695 | struct relay_viewer_stream *vstream = NULL; |
553b2adb | 1696 | uint32_t reply_size = sizeof(reply_header); |
b6025e94 JR |
1697 | uint32_t packet_data_len = 0; |
1698 | ssize_t read_len; | |
d3e2ba59 JD |
1699 | |
1700 | DBG2("Relay get data packet"); | |
1701 | ||
eea7556c | 1702 | health_code_update(); |
2f8f53af | 1703 | |
7591bab1 MD |
1704 | ret = recv_request(conn->sock, &get_packet_info, |
1705 | sizeof(get_packet_info)); | |
2f8f53af | 1706 | if (ret < 0) { |
d3e2ba59 JD |
1707 | goto end; |
1708 | } | |
eea7556c | 1709 | health_code_update(); |
d3e2ba59 | 1710 | |
0233a6a5 | 1711 | /* From this point on, the error label can be reached. */ |
553b2adb | 1712 | memset(&reply_header, 0, sizeof(reply_header)); |
0233a6a5 | 1713 | |
7591bab1 MD |
1714 | vstream = viewer_stream_get_by_id(be64toh(get_packet_info.stream_id)); |
1715 | if (!vstream) { | |
a44ca2ca | 1716 | DBG("Client requested packet of unknown stream id %" PRIu64, |
9b9f9f94 | 1717 | (uint64_t) be64toh(get_packet_info.stream_id)); |
553b2adb JG |
1718 | reply_header.status = htobe32(LTTNG_VIEWER_GET_PACKET_ERR); |
1719 | goto send_reply_nolock; | |
b6025e94 JR |
1720 | } else { |
1721 | packet_data_len = be32toh(get_packet_info.len); | |
553b2adb | 1722 | reply_size += packet_data_len; |
d3e2ba59 | 1723 | } |
2a174661 | 1724 | |
553b2adb JG |
1725 | reply = zmalloc(reply_size); |
1726 | if (!reply) { | |
1727 | PERROR("packet reply zmalloc"); | |
1728 | reply_size = sizeof(reply_header); | |
d3e2ba59 JD |
1729 | goto error; |
1730 | } | |
1731 | ||
b6025e94 | 1732 | pthread_mutex_lock(&vstream->stream->lock); |
ebb29c10 JG |
1733 | lseek_ret = lseek(vstream->stream_file.fd->fd, |
1734 | be64toh(get_packet_info.offset), SEEK_SET); | |
a5df8828 | 1735 | if (lseek_ret < 0) { |
ebb29c10 JG |
1736 | PERROR("lseek fd %d to offset %" PRIu64, |
1737 | vstream->stream_file.fd->fd, | |
1738 | (uint64_t) be64toh(get_packet_info.offset)); | |
7591bab1 | 1739 | goto error; |
d3e2ba59 | 1740 | } |
ebb29c10 JG |
1741 | read_len = lttng_read(vstream->stream_file.fd->fd, |
1742 | reply + sizeof(reply_header), packet_data_len); | |
b6025e94 | 1743 | if (read_len < packet_data_len) { |
7591bab1 | 1744 | PERROR("Relay reading trace file, fd: %d, offset: %" PRIu64, |
ebb29c10 | 1745 | vstream->stream_file.fd->fd, |
9b9f9f94 | 1746 | (uint64_t) be64toh(get_packet_info.offset)); |
7591bab1 | 1747 | goto error; |
d3e2ba59 | 1748 | } |
553b2adb JG |
1749 | reply_header.status = htobe32(LTTNG_VIEWER_GET_PACKET_OK); |
1750 | reply_header.len = htobe32(packet_data_len); | |
d3e2ba59 JD |
1751 | goto send_reply; |
1752 | ||
1753 | error: | |
553b2adb | 1754 | reply_header.status = htobe32(LTTNG_VIEWER_GET_PACKET_ERR); |
d3e2ba59 JD |
1755 | |
1756 | send_reply: | |
7591bab1 MD |
1757 | if (vstream) { |
1758 | pthread_mutex_unlock(&vstream->stream->lock); | |
1759 | } | |
1760 | send_reply_nolock: | |
eea7556c MD |
1761 | |
1762 | health_code_update(); | |
2f8f53af | 1763 | |
553b2adb JG |
1764 | if (reply) { |
1765 | memcpy(reply, &reply_header, sizeof(reply_header)); | |
1766 | ret = send_response(conn->sock, reply, reply_size); | |
1767 | } else { | |
1768 | /* No reply to send. */ | |
1769 | ret = send_response(conn->sock, &reply_header, | |
1770 | reply_size); | |
1771 | } | |
1772 | ||
b6025e94 | 1773 | health_code_update(); |
d3e2ba59 | 1774 | if (ret < 0) { |
b6025e94 | 1775 | PERROR("sendmsg of packet data failed"); |
7591bab1 | 1776 | goto end_free; |
d3e2ba59 | 1777 | } |
d3e2ba59 | 1778 | |
553b2adb | 1779 | DBG("Sent %u bytes for stream %" PRIu64, reply_size, |
9b9f9f94 | 1780 | (uint64_t) be64toh(get_packet_info.stream_id)); |
d3e2ba59 | 1781 | |
7591bab1 | 1782 | end_free: |
553b2adb | 1783 | free(reply); |
d3e2ba59 | 1784 | end: |
7591bab1 MD |
1785 | if (vstream) { |
1786 | viewer_stream_put(vstream); | |
1787 | } | |
d3e2ba59 JD |
1788 | return ret; |
1789 | } | |
1790 | ||
1791 | /* | |
1792 | * Send the session's metadata | |
1793 | * | |
1794 | * Return 0 on success else a negative value. | |
1795 | */ | |
1796 | static | |
58eb9381 | 1797 | int viewer_get_metadata(struct relay_connection *conn) |
d3e2ba59 JD |
1798 | { |
1799 | int ret = 0; | |
1800 | ssize_t read_len; | |
1801 | uint64_t len = 0; | |
1802 | char *data = NULL; | |
1803 | struct lttng_viewer_get_metadata request; | |
1804 | struct lttng_viewer_metadata_packet reply; | |
7591bab1 | 1805 | struct relay_viewer_stream *vstream = NULL; |
d3e2ba59 | 1806 | |
58eb9381 | 1807 | assert(conn); |
d3e2ba59 JD |
1808 | |
1809 | DBG("Relay get metadata"); | |
1810 | ||
eea7556c | 1811 | health_code_update(); |
2f8f53af | 1812 | |
58eb9381 | 1813 | ret = recv_request(conn->sock, &request, sizeof(request)); |
2f8f53af | 1814 | if (ret < 0) { |
d3e2ba59 JD |
1815 | goto end; |
1816 | } | |
eea7556c | 1817 | health_code_update(); |
d3e2ba59 | 1818 | |
53efb85a MD |
1819 | memset(&reply, 0, sizeof(reply)); |
1820 | ||
7591bab1 MD |
1821 | vstream = viewer_stream_get_by_id(be64toh(request.stream_id)); |
1822 | if (!vstream) { | |
3b463131 MD |
1823 | /* |
1824 | * The metadata stream can be closed by a CLOSE command | |
1825 | * just before we attach. It can also be closed by | |
1826 | * per-pid tracing during tracing. Therefore, it is | |
1827 | * possible that we cannot find this viewer stream. | |
1828 | * Reply back to the client with an error if we cannot | |
1829 | * find it. | |
1830 | */ | |
a44ca2ca | 1831 | DBG("Client requested metadata of unknown stream id %" PRIu64, |
9b9f9f94 | 1832 | (uint64_t) be64toh(request.stream_id)); |
3b463131 | 1833 | reply.status = htobe32(LTTNG_VIEWER_METADATA_ERR); |
7591bab1 | 1834 | goto send_reply; |
d3e2ba59 | 1835 | } |
7591bab1 MD |
1836 | pthread_mutex_lock(&vstream->stream->lock); |
1837 | if (!vstream->stream->is_metadata) { | |
1838 | ERR("Invalid metadata stream"); | |
6763619c JD |
1839 | goto error; |
1840 | } | |
1841 | ||
b0d240a2 | 1842 | if (vstream->metadata_sent >= vstream->stream->metadata_received) { |
94f73d08 MD |
1843 | /* |
1844 | * The live viewers expect to receive a NO_NEW_METADATA | |
1845 | * status before a stream disappears, otherwise they abort the | |
1846 | * entire live connection when receiving an error status. | |
b0d240a2 MD |
1847 | * |
1848 | * Clear feature resets the metadata_sent to 0 until the | |
1849 | * same metadata is received again. | |
94f73d08 | 1850 | */ |
c4e361a4 | 1851 | reply.status = htobe32(LTTNG_VIEWER_NO_NEW_METADATA); |
94f73d08 MD |
1852 | /* |
1853 | * The live viewer considers a closed 0 byte metadata stream as | |
1854 | * an error. | |
1855 | */ | |
1856 | if (vstream->metadata_sent > 0) { | |
1857 | vstream->stream->no_new_metadata_notified = true; | |
1858 | if (vstream->stream->closed) { | |
1859 | /* Release ownership for the viewer metadata stream. */ | |
1860 | viewer_stream_put(vstream); | |
1861 | } | |
1862 | } | |
d3e2ba59 JD |
1863 | goto send_reply; |
1864 | } | |
1865 | ||
b0d240a2 MD |
1866 | len = vstream->stream->metadata_received - vstream->metadata_sent; |
1867 | ||
d3e2ba59 | 1868 | /* first time, we open the metadata file */ |
ebb29c10 JG |
1869 | if (!vstream->stream_file.fd) { |
1870 | int fd; | |
1871 | char file_path[LTTNG_PATH_MAX]; | |
1872 | enum lttng_trace_chunk_status status; | |
1873 | struct relay_stream *rstream = vstream->stream; | |
1874 | ||
1875 | ret = utils_stream_file_path(rstream->path_name, | |
1876 | rstream->channel_name, rstream->tracefile_size, | |
1877 | vstream->current_tracefile_id, NULL, file_path, | |
1878 | sizeof(file_path)); | |
d3e2ba59 JD |
1879 | if (ret < 0) { |
1880 | goto error; | |
1881 | } | |
ebb29c10 | 1882 | |
3ff5c5db MD |
1883 | /* |
1884 | * It is possible the the metadata file we are trying to open is | |
1885 | * missing if the stream has been closed (application exits with | |
1886 | * per-pid buffers) and a clear command has been performed. | |
1887 | */ | |
ebb29c10 JG |
1888 | status = lttng_trace_chunk_open_file( |
1889 | vstream->stream_file.trace_chunk, | |
3ff5c5db | 1890 | file_path, O_RDONLY, 0, &fd, true); |
ebb29c10 | 1891 | if (status != LTTNG_TRACE_CHUNK_STATUS_OK) { |
b0d240a2 MD |
1892 | if (status == LTTNG_TRACE_CHUNK_STATUS_NO_FILE) { |
1893 | reply.status = htobe32(LTTNG_VIEWER_NO_NEW_METADATA); | |
1894 | len = 0; | |
1895 | if (vstream->stream->closed) { | |
1896 | viewer_stream_put(vstream); | |
1897 | } | |
1898 | goto send_reply; | |
1899 | } | |
ebb29c10 | 1900 | PERROR("Failed to open metadata file for viewer stream"); |
d3e2ba59 JD |
1901 | goto error; |
1902 | } | |
ebb29c10 JG |
1903 | vstream->stream_file.fd = stream_fd_create(fd); |
1904 | if (!vstream->stream_file.fd) { | |
1905 | if (close(fd)) { | |
1906 | PERROR("Failed to close viewer metadata file"); | |
7591bab1 MD |
1907 | } |
1908 | goto error; | |
1909 | } | |
d3e2ba59 JD |
1910 | } |
1911 | ||
1912 | reply.len = htobe64(len); | |
1913 | data = zmalloc(len); | |
1914 | if (!data) { | |
1915 | PERROR("viewer metadata zmalloc"); | |
1916 | goto error; | |
1917 | } | |
1918 | ||
ebb29c10 | 1919 | read_len = lttng_read(vstream->stream_file.fd->fd, data, len); |
6cd525e8 | 1920 | if (read_len < len) { |
d3e2ba59 JD |
1921 | PERROR("Relay reading metadata file"); |
1922 | goto error; | |
1923 | } | |
7591bab1 | 1924 | vstream->metadata_sent += read_len; |
c4e361a4 | 1925 | reply.status = htobe32(LTTNG_VIEWER_METADATA_OK); |
7591bab1 | 1926 | |
d3e2ba59 JD |
1927 | goto send_reply; |
1928 | ||
1929 | error: | |
c4e361a4 | 1930 | reply.status = htobe32(LTTNG_VIEWER_METADATA_ERR); |
d3e2ba59 JD |
1931 | |
1932 | send_reply: | |
eea7556c | 1933 | health_code_update(); |
7591bab1 MD |
1934 | if (vstream) { |
1935 | pthread_mutex_unlock(&vstream->stream->lock); | |
1936 | } | |
58eb9381 | 1937 | ret = send_response(conn->sock, &reply, sizeof(reply)); |
d3e2ba59 | 1938 | if (ret < 0) { |
7591bab1 | 1939 | goto end_free; |
d3e2ba59 | 1940 | } |
eea7556c | 1941 | health_code_update(); |
d3e2ba59 JD |
1942 | |
1943 | if (len > 0) { | |
58eb9381 | 1944 | ret = send_response(conn->sock, data, len); |
d3e2ba59 | 1945 | if (ret < 0) { |
7591bab1 | 1946 | goto end_free; |
d3e2ba59 JD |
1947 | } |
1948 | } | |
1949 | ||
1950 | DBG("Sent %" PRIu64 " bytes of metadata for stream %" PRIu64, len, | |
9b9f9f94 | 1951 | (uint64_t) be64toh(request.stream_id)); |
d3e2ba59 JD |
1952 | |
1953 | DBG("Metadata sent"); | |
1954 | ||
7591bab1 | 1955 | end_free: |
d3e2ba59 | 1956 | free(data); |
d3e2ba59 | 1957 | end: |
7591bab1 MD |
1958 | if (vstream) { |
1959 | viewer_stream_put(vstream); | |
1960 | } | |
d3e2ba59 JD |
1961 | return ret; |
1962 | } | |
1963 | ||
c3b7390b JD |
1964 | /* |
1965 | * Create a viewer session. | |
1966 | * | |
1967 | * Return 0 on success or else a negative value. | |
1968 | */ | |
1969 | static | |
1970 | int viewer_create_session(struct relay_connection *conn) | |
1971 | { | |
1972 | int ret; | |
1973 | struct lttng_viewer_create_session_response resp; | |
1974 | ||
1975 | DBG("Viewer create session received"); | |
1976 | ||
53efb85a | 1977 | memset(&resp, 0, sizeof(resp)); |
c3b7390b | 1978 | resp.status = htobe32(LTTNG_VIEWER_CREATE_SESSION_OK); |
7591bab1 | 1979 | conn->viewer_session = viewer_session_create(); |
c3b7390b JD |
1980 | if (!conn->viewer_session) { |
1981 | ERR("Allocation viewer session"); | |
1982 | resp.status = htobe32(LTTNG_VIEWER_CREATE_SESSION_ERR); | |
1983 | goto send_reply; | |
1984 | } | |
c3b7390b JD |
1985 | |
1986 | send_reply: | |
1987 | health_code_update(); | |
1988 | ret = send_response(conn->sock, &resp, sizeof(resp)); | |
1989 | if (ret < 0) { | |
1990 | goto end; | |
1991 | } | |
1992 | health_code_update(); | |
1993 | ret = 0; | |
1994 | ||
1995 | end: | |
1996 | return ret; | |
1997 | } | |
1998 | ||
d62023be JD |
1999 | /* |
2000 | * Detach a viewer session. | |
2001 | * | |
2002 | * Return 0 on success or else a negative value. | |
2003 | */ | |
2004 | static | |
2005 | int viewer_detach_session(struct relay_connection *conn) | |
2006 | { | |
2007 | int ret; | |
2008 | struct lttng_viewer_detach_session_response response; | |
2009 | struct lttng_viewer_detach_session_request request; | |
2010 | struct relay_session *session = NULL; | |
2011 | uint64_t viewer_session_to_close; | |
2012 | ||
2013 | DBG("Viewer detach session received"); | |
2014 | ||
2015 | assert(conn); | |
2016 | ||
2017 | health_code_update(); | |
2018 | ||
2019 | /* Receive the request from the connected client. */ | |
2020 | ret = recv_request(conn->sock, &request, sizeof(request)); | |
2021 | if (ret < 0) { | |
2022 | goto end; | |
2023 | } | |
2024 | viewer_session_to_close = be64toh(request.session_id); | |
2025 | ||
2026 | if (!conn->viewer_session) { | |
2027 | DBG("Client trying to detach before creating a live viewer session"); | |
2028 | response.status = htobe32(LTTNG_VIEWER_DETACH_SESSION_ERR); | |
2029 | goto send_reply; | |
2030 | } | |
2031 | ||
2032 | health_code_update(); | |
2033 | ||
2034 | memset(&response, 0, sizeof(response)); | |
2035 | DBG("Detaching from session ID %" PRIu64, viewer_session_to_close); | |
2036 | ||
2037 | session = session_get_by_id(be64toh(request.session_id)); | |
2038 | if (!session) { | |
2039 | DBG("Relay session %" PRIu64 " not found", | |
9b9f9f94 | 2040 | (uint64_t) be64toh(request.session_id)); |
d62023be JD |
2041 | response.status = htobe32(LTTNG_VIEWER_DETACH_SESSION_UNK); |
2042 | goto send_reply; | |
2043 | } | |
2044 | ||
2045 | ret = viewer_session_is_attached(conn->viewer_session, session); | |
2046 | if (ret != 1) { | |
2047 | DBG("Not attached to this session"); | |
2048 | response.status = htobe32(LTTNG_VIEWER_DETACH_SESSION_ERR); | |
2049 | goto send_reply_put; | |
2050 | } | |
2051 | ||
2052 | viewer_session_close_one_session(conn->viewer_session, session); | |
2053 | response.status = htobe32(LTTNG_VIEWER_DETACH_SESSION_OK); | |
2054 | DBG("Session %" PRIu64 " detached.", viewer_session_to_close); | |
2055 | ||
2056 | send_reply_put: | |
2057 | session_put(session); | |
2058 | ||
2059 | send_reply: | |
2060 | health_code_update(); | |
2061 | ret = send_response(conn->sock, &response, sizeof(response)); | |
2062 | if (ret < 0) { | |
2063 | goto end; | |
2064 | } | |
2065 | health_code_update(); | |
2066 | ret = 0; | |
2067 | ||
2068 | end: | |
2069 | return ret; | |
2070 | } | |
c3b7390b | 2071 | |
d3e2ba59 JD |
2072 | /* |
2073 | * live_relay_unknown_command: send -1 if received unknown command | |
2074 | */ | |
2075 | static | |
58eb9381 | 2076 | void live_relay_unknown_command(struct relay_connection *conn) |
d3e2ba59 JD |
2077 | { |
2078 | struct lttcomm_relayd_generic_reply reply; | |
d3e2ba59 | 2079 | |
53efb85a | 2080 | memset(&reply, 0, sizeof(reply)); |
d3e2ba59 | 2081 | reply.ret_code = htobe32(LTTNG_ERR_UNK); |
58eb9381 | 2082 | (void) send_response(conn->sock, &reply, sizeof(reply)); |
d3e2ba59 JD |
2083 | } |
2084 | ||
2085 | /* | |
2086 | * Process the commands received on the control socket | |
2087 | */ | |
2088 | static | |
2089 | int process_control(struct lttng_viewer_cmd *recv_hdr, | |
58eb9381 | 2090 | struct relay_connection *conn) |
d3e2ba59 JD |
2091 | { |
2092 | int ret = 0; | |
2f8f53af DG |
2093 | uint32_t msg_value; |
2094 | ||
2f8f53af DG |
2095 | msg_value = be32toh(recv_hdr->cmd); |
2096 | ||
2097 | /* | |
2098 | * Make sure we've done the version check before any command other then a | |
2099 | * new client connection. | |
2100 | */ | |
c4e361a4 | 2101 | if (msg_value != LTTNG_VIEWER_CONNECT && !conn->version_check_done) { |
58eb9381 | 2102 | ERR("Viewer conn value %" PRIu32 " before version check", msg_value); |
2f8f53af DG |
2103 | ret = -1; |
2104 | goto end; | |
2105 | } | |
d3e2ba59 | 2106 | |
2f8f53af | 2107 | switch (msg_value) { |
c4e361a4 | 2108 | case LTTNG_VIEWER_CONNECT: |
58eb9381 | 2109 | ret = viewer_connect(conn); |
d3e2ba59 | 2110 | break; |
c4e361a4 | 2111 | case LTTNG_VIEWER_LIST_SESSIONS: |
58eb9381 | 2112 | ret = viewer_list_sessions(conn); |
d3e2ba59 | 2113 | break; |
c4e361a4 | 2114 | case LTTNG_VIEWER_ATTACH_SESSION: |
58eb9381 | 2115 | ret = viewer_attach_session(conn); |
d3e2ba59 | 2116 | break; |
c4e361a4 | 2117 | case LTTNG_VIEWER_GET_NEXT_INDEX: |
58eb9381 | 2118 | ret = viewer_get_next_index(conn); |
d3e2ba59 | 2119 | break; |
c4e361a4 | 2120 | case LTTNG_VIEWER_GET_PACKET: |
58eb9381 | 2121 | ret = viewer_get_packet(conn); |
d3e2ba59 | 2122 | break; |
c4e361a4 | 2123 | case LTTNG_VIEWER_GET_METADATA: |
58eb9381 | 2124 | ret = viewer_get_metadata(conn); |
d3e2ba59 | 2125 | break; |
c4e361a4 | 2126 | case LTTNG_VIEWER_GET_NEW_STREAMS: |
58eb9381 | 2127 | ret = viewer_get_new_streams(conn); |
80e8027a | 2128 | break; |
c3b7390b JD |
2129 | case LTTNG_VIEWER_CREATE_SESSION: |
2130 | ret = viewer_create_session(conn); | |
2131 | break; | |
d62023be JD |
2132 | case LTTNG_VIEWER_DETACH_SESSION: |
2133 | ret = viewer_detach_session(conn); | |
2134 | break; | |
d3e2ba59 | 2135 | default: |
7591bab1 MD |
2136 | ERR("Received unknown viewer command (%u)", |
2137 | be32toh(recv_hdr->cmd)); | |
58eb9381 | 2138 | live_relay_unknown_command(conn); |
d3e2ba59 JD |
2139 | ret = -1; |
2140 | goto end; | |
2141 | } | |
2142 | ||
2143 | end: | |
2144 | return ret; | |
2145 | } | |
2146 | ||
2147 | static | |
58eb9381 | 2148 | void cleanup_connection_pollfd(struct lttng_poll_event *events, int pollfd) |
d3e2ba59 JD |
2149 | { |
2150 | int ret; | |
2151 | ||
58eb9381 | 2152 | (void) lttng_poll_del(events, pollfd); |
d3e2ba59 JD |
2153 | |
2154 | ret = close(pollfd); | |
2155 | if (ret < 0) { | |
2156 | ERR("Closing pollfd %d", pollfd); | |
2157 | } | |
2158 | } | |
2159 | ||
d3e2ba59 JD |
2160 | /* |
2161 | * This thread does the actual work | |
2162 | */ | |
2163 | static | |
2164 | void *thread_worker(void *data) | |
2165 | { | |
2166 | int ret, err = -1; | |
2167 | uint32_t nb_fd; | |
d3e2ba59 | 2168 | struct lttng_poll_event events; |
7591bab1 | 2169 | struct lttng_ht *viewer_connections_ht; |
d3e2ba59 JD |
2170 | struct lttng_ht_iter iter; |
2171 | struct lttng_viewer_cmd recv_hdr; | |
302d8906 | 2172 | struct relay_connection *destroy_conn; |
d3e2ba59 JD |
2173 | |
2174 | DBG("[thread] Live viewer relay worker started"); | |
2175 | ||
2176 | rcu_register_thread(); | |
2177 | ||
eea7556c MD |
2178 | health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_WORKER); |
2179 | ||
9b5e0863 MD |
2180 | if (testpoint(relayd_thread_live_worker)) { |
2181 | goto error_testpoint; | |
2182 | } | |
2183 | ||
d3e2ba59 | 2184 | /* table of connections indexed on socket */ |
7591bab1 MD |
2185 | viewer_connections_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
2186 | if (!viewer_connections_ht) { | |
2187 | goto viewer_connections_ht_error; | |
d3e2ba59 JD |
2188 | } |
2189 | ||
2190 | ret = create_thread_poll_set(&events, 2); | |
2191 | if (ret < 0) { | |
2192 | goto error_poll_create; | |
2193 | } | |
2194 | ||
58eb9381 | 2195 | ret = lttng_poll_add(&events, live_conn_pipe[0], LPOLLIN | LPOLLRDHUP); |
d3e2ba59 JD |
2196 | if (ret < 0) { |
2197 | goto error; | |
2198 | } | |
2199 | ||
2200 | restart: | |
2201 | while (1) { | |
2202 | int i; | |
2203 | ||
eea7556c MD |
2204 | health_code_update(); |
2205 | ||
d3e2ba59 JD |
2206 | /* Infinite blocking call, waiting for transmission */ |
2207 | DBG3("Relayd live viewer worker thread polling..."); | |
eea7556c | 2208 | health_poll_entry(); |
d3e2ba59 | 2209 | ret = lttng_poll_wait(&events, -1); |
eea7556c | 2210 | health_poll_exit(); |
d3e2ba59 JD |
2211 | if (ret < 0) { |
2212 | /* | |
2213 | * Restart interrupted system call. | |
2214 | */ | |
2215 | if (errno == EINTR) { | |
2216 | goto restart; | |
2217 | } | |
2218 | goto error; | |
2219 | } | |
2220 | ||
2221 | nb_fd = ret; | |
2222 | ||
2223 | /* | |
2224 | * Process control. The control connection is prioritised so we don't | |
2225 | * starve it with high throughput tracing data on the data | |
2226 | * connection. | |
2227 | */ | |
2228 | for (i = 0; i < nb_fd; i++) { | |
2229 | /* Fetch once the poll data */ | |
2230 | uint32_t revents = LTTNG_POLL_GETEV(&events, i); | |
2231 | int pollfd = LTTNG_POLL_GETFD(&events, i); | |
2232 | ||
eea7556c MD |
2233 | health_code_update(); |
2234 | ||
d3e2ba59 | 2235 | /* Thread quit pipe has been closed. Killing thread. */ |
bcf4a440 | 2236 | ret = check_thread_quit_pipe(pollfd, revents); |
d3e2ba59 JD |
2237 | if (ret) { |
2238 | err = 0; | |
2239 | goto exit; | |
2240 | } | |
2241 | ||
7591bab1 | 2242 | /* Inspect the relay conn pipe for new connection. */ |
58eb9381 | 2243 | if (pollfd == live_conn_pipe[0]) { |
03e43155 | 2244 | if (revents & LPOLLIN) { |
302d8906 JG |
2245 | struct relay_connection *conn; |
2246 | ||
7591bab1 MD |
2247 | ret = lttng_read(live_conn_pipe[0], |
2248 | &conn, sizeof(conn)); | |
d3e2ba59 JD |
2249 | if (ret < 0) { |
2250 | goto error; | |
2251 | } | |
73039936 FD |
2252 | ret = lttng_poll_add(&events, |
2253 | conn->sock->fd, | |
58eb9381 | 2254 | LPOLLIN | LPOLLRDHUP); |
73039936 FD |
2255 | if (ret) { |
2256 | ERR("Failed to add new live connection file descriptor to poll set"); | |
2257 | goto error; | |
2258 | } | |
7591bab1 MD |
2259 | connection_ht_add(viewer_connections_ht, conn); |
2260 | DBG("Connection socket %d added to poll", conn->sock->fd); | |
03e43155 MD |
2261 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
2262 | ERR("Relay live pipe error"); | |
2263 | goto error; | |
2264 | } else { | |
2265 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
2266 | goto error; | |
d3e2ba59 | 2267 | } |
58eb9381 | 2268 | } else { |
7591bab1 | 2269 | /* Connection activity. */ |
302d8906 JG |
2270 | struct relay_connection *conn; |
2271 | ||
7591bab1 MD |
2272 | conn = connection_get_by_sock(viewer_connections_ht, pollfd); |
2273 | if (!conn) { | |
2274 | continue; | |
2275 | } | |
58eb9381 | 2276 | |
03e43155 | 2277 | if (revents & LPOLLIN) { |
58eb9381 DG |
2278 | ret = conn->sock->ops->recvmsg(conn->sock, &recv_hdr, |
2279 | sizeof(recv_hdr), 0); | |
d3e2ba59 | 2280 | if (ret <= 0) { |
7591bab1 | 2281 | /* Connection closed. */ |
58eb9381 | 2282 | cleanup_connection_pollfd(&events, pollfd); |
7591bab1 MD |
2283 | /* Put "create" ownership reference. */ |
2284 | connection_put(conn); | |
58eb9381 | 2285 | DBG("Viewer control conn closed with %d", pollfd); |
d3e2ba59 | 2286 | } else { |
58eb9381 | 2287 | ret = process_control(&recv_hdr, conn); |
d3e2ba59 JD |
2288 | if (ret < 0) { |
2289 | /* Clear the session on error. */ | |
58eb9381 | 2290 | cleanup_connection_pollfd(&events, pollfd); |
7591bab1 MD |
2291 | /* Put "create" ownership reference. */ |
2292 | connection_put(conn); | |
d3e2ba59 JD |
2293 | DBG("Viewer connection closed with %d", pollfd); |
2294 | } | |
2295 | } | |
03e43155 MD |
2296 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
2297 | cleanup_connection_pollfd(&events, pollfd); | |
2298 | /* Put "create" ownership reference. */ | |
2299 | connection_put(conn); | |
2300 | } else { | |
2301 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
2302 | connection_put(conn); | |
2303 | goto error; | |
d3e2ba59 | 2304 | } |
7591bab1 MD |
2305 | /* Put local "get_by_sock" reference. */ |
2306 | connection_put(conn); | |
d3e2ba59 JD |
2307 | } |
2308 | } | |
2309 | } | |
2310 | ||
2311 | exit: | |
2312 | error: | |
2313 | lttng_poll_clean(&events); | |
2314 | ||
71efa8ef | 2315 | /* Cleanup remaining connection object. */ |
d3e2ba59 | 2316 | rcu_read_lock(); |
7591bab1 | 2317 | cds_lfht_for_each_entry(viewer_connections_ht->ht, &iter.iter, |
302d8906 | 2318 | destroy_conn, |
58eb9381 | 2319 | sock_n.node) { |
eea7556c | 2320 | health_code_update(); |
7591bab1 | 2321 | connection_put(destroy_conn); |
d3e2ba59 JD |
2322 | } |
2323 | rcu_read_unlock(); | |
2324 | error_poll_create: | |
7591bab1 MD |
2325 | lttng_ht_destroy(viewer_connections_ht); |
2326 | viewer_connections_ht_error: | |
58eb9381 | 2327 | /* Close relay conn pipes */ |
87bcbe91 | 2328 | (void) fd_tracker_util_pipe_close(the_fd_tracker, live_conn_pipe); |
d3e2ba59 JD |
2329 | if (err) { |
2330 | DBG("Viewer worker thread exited with error"); | |
2331 | } | |
2332 | DBG("Viewer worker thread cleanup complete"); | |
9b5e0863 | 2333 | error_testpoint: |
eea7556c MD |
2334 | if (err) { |
2335 | health_error(); | |
2336 | ERR("Health error occurred in %s", __func__); | |
2337 | } | |
2338 | health_unregister(health_relayd); | |
b4aacfdc MD |
2339 | if (lttng_relay_stop_threads()) { |
2340 | ERR("Error stopping threads"); | |
178a0557 | 2341 | } |
d3e2ba59 JD |
2342 | rcu_unregister_thread(); |
2343 | return NULL; | |
2344 | } | |
2345 | ||
2346 | /* | |
2347 | * Create the relay command pipe to wake thread_manage_apps. | |
2348 | * Closed in cleanup(). | |
2349 | */ | |
58eb9381 | 2350 | static int create_conn_pipe(void) |
d3e2ba59 | 2351 | { |
87bcbe91 JG |
2352 | return fd_tracker_util_pipe_open_cloexec(the_fd_tracker, |
2353 | "Live connection pipe", live_conn_pipe); | |
178a0557 | 2354 | } |
d3e2ba59 | 2355 | |
178a0557 | 2356 | int relayd_live_join(void) |
d3e2ba59 | 2357 | { |
178a0557 | 2358 | int ret, retval = 0; |
d3e2ba59 JD |
2359 | void *status; |
2360 | ||
d3e2ba59 | 2361 | ret = pthread_join(live_listener_thread, &status); |
178a0557 MD |
2362 | if (ret) { |
2363 | errno = ret; | |
d3e2ba59 | 2364 | PERROR("pthread_join live listener"); |
178a0557 | 2365 | retval = -1; |
d3e2ba59 JD |
2366 | } |
2367 | ||
2368 | ret = pthread_join(live_worker_thread, &status); | |
178a0557 MD |
2369 | if (ret) { |
2370 | errno = ret; | |
d3e2ba59 | 2371 | PERROR("pthread_join live worker"); |
178a0557 | 2372 | retval = -1; |
d3e2ba59 JD |
2373 | } |
2374 | ||
2375 | ret = pthread_join(live_dispatcher_thread, &status); | |
178a0557 MD |
2376 | if (ret) { |
2377 | errno = ret; | |
d3e2ba59 | 2378 | PERROR("pthread_join live dispatcher"); |
178a0557 | 2379 | retval = -1; |
d3e2ba59 JD |
2380 | } |
2381 | ||
178a0557 | 2382 | cleanup_relayd_live(); |
d3e2ba59 | 2383 | |
178a0557 | 2384 | return retval; |
d3e2ba59 JD |
2385 | } |
2386 | ||
2387 | /* | |
2388 | * main | |
2389 | */ | |
7591bab1 | 2390 | int relayd_live_create(struct lttng_uri *uri) |
d3e2ba59 | 2391 | { |
178a0557 | 2392 | int ret = 0, retval = 0; |
d3e2ba59 JD |
2393 | void *status; |
2394 | int is_root; | |
2395 | ||
178a0557 MD |
2396 | if (!uri) { |
2397 | retval = -1; | |
2398 | goto exit_init_data; | |
2399 | } | |
d3e2ba59 JD |
2400 | live_uri = uri; |
2401 | ||
d3e2ba59 JD |
2402 | /* Check if daemon is UID = 0 */ |
2403 | is_root = !getuid(); | |
2404 | ||
2405 | if (!is_root) { | |
2406 | if (live_uri->port < 1024) { | |
2407 | ERR("Need to be root to use ports < 1024"); | |
178a0557 MD |
2408 | retval = -1; |
2409 | goto exit_init_data; | |
d3e2ba59 JD |
2410 | } |
2411 | } | |
2412 | ||
2413 | /* Setup the thread apps communication pipe. */ | |
178a0557 MD |
2414 | if (create_conn_pipe()) { |
2415 | retval = -1; | |
2416 | goto exit_init_data; | |
d3e2ba59 JD |
2417 | } |
2418 | ||
2419 | /* Init relay command queue. */ | |
8bdee6e2 | 2420 | cds_wfcq_init(&viewer_conn_queue.head, &viewer_conn_queue.tail); |
d3e2ba59 JD |
2421 | |
2422 | /* Set up max poll set size */ | |
25b397f9 MD |
2423 | if (lttng_poll_set_max_size()) { |
2424 | retval = -1; | |
2425 | goto exit_init_data; | |
2426 | } | |
d3e2ba59 JD |
2427 | |
2428 | /* Setup the dispatcher thread */ | |
1a1a34b4 | 2429 | ret = pthread_create(&live_dispatcher_thread, default_pthread_attr(), |
d3e2ba59 | 2430 | thread_dispatcher, (void *) NULL); |
178a0557 MD |
2431 | if (ret) { |
2432 | errno = ret; | |
d3e2ba59 | 2433 | PERROR("pthread_create viewer dispatcher"); |
178a0557 MD |
2434 | retval = -1; |
2435 | goto exit_dispatcher_thread; | |
d3e2ba59 JD |
2436 | } |
2437 | ||
2438 | /* Setup the worker thread */ | |
1a1a34b4 | 2439 | ret = pthread_create(&live_worker_thread, default_pthread_attr(), |
7591bab1 | 2440 | thread_worker, NULL); |
178a0557 MD |
2441 | if (ret) { |
2442 | errno = ret; | |
d3e2ba59 | 2443 | PERROR("pthread_create viewer worker"); |
178a0557 MD |
2444 | retval = -1; |
2445 | goto exit_worker_thread; | |
d3e2ba59 JD |
2446 | } |
2447 | ||
2448 | /* Setup the listener thread */ | |
1a1a34b4 | 2449 | ret = pthread_create(&live_listener_thread, default_pthread_attr(), |
d3e2ba59 | 2450 | thread_listener, (void *) NULL); |
178a0557 MD |
2451 | if (ret) { |
2452 | errno = ret; | |
d3e2ba59 | 2453 | PERROR("pthread_create viewer listener"); |
178a0557 MD |
2454 | retval = -1; |
2455 | goto exit_listener_thread; | |
d3e2ba59 JD |
2456 | } |
2457 | ||
178a0557 MD |
2458 | /* |
2459 | * All OK, started all threads. | |
2460 | */ | |
2461 | return retval; | |
2462 | ||
9911d21b JG |
2463 | /* |
2464 | * Join on the live_listener_thread should anything be added after | |
2465 | * the live_listener thread's creation. | |
2466 | */ | |
d3e2ba59 | 2467 | |
178a0557 | 2468 | exit_listener_thread: |
d3e2ba59 | 2469 | |
d3e2ba59 | 2470 | ret = pthread_join(live_worker_thread, &status); |
178a0557 MD |
2471 | if (ret) { |
2472 | errno = ret; | |
d3e2ba59 | 2473 | PERROR("pthread_join live worker"); |
178a0557 | 2474 | retval = -1; |
d3e2ba59 | 2475 | } |
178a0557 | 2476 | exit_worker_thread: |
d3e2ba59 | 2477 | |
d3e2ba59 | 2478 | ret = pthread_join(live_dispatcher_thread, &status); |
178a0557 MD |
2479 | if (ret) { |
2480 | errno = ret; | |
d3e2ba59 | 2481 | PERROR("pthread_join live dispatcher"); |
178a0557 | 2482 | retval = -1; |
d3e2ba59 | 2483 | } |
178a0557 | 2484 | exit_dispatcher_thread: |
d3e2ba59 | 2485 | |
178a0557 MD |
2486 | exit_init_data: |
2487 | cleanup_relayd_live(); | |
d3e2ba59 | 2488 | |
178a0557 | 2489 | return retval; |
d3e2ba59 | 2490 | } |