Commit | Line | Data |
---|---|---|
d3e2ba59 JD |
1 | /* |
2 | * Copyright (C) 2013 - Julien Desfossez <jdesfossez@efficios.com> | |
3 | * David Goulet <dgoulet@efficios.com> | |
7591bab1 | 4 | * 2015 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
d3e2ba59 JD |
5 | * |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License, version 2 only, | |
8 | * as published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
11 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
12 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
13 | * more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License along | |
16 | * with this program; if not, write to the Free Software Foundation, Inc., | |
17 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 | */ | |
19 | ||
6c1c0768 | 20 | #define _LGPL_SOURCE |
d3e2ba59 JD |
21 | #include <getopt.h> |
22 | #include <grp.h> | |
23 | #include <limits.h> | |
24 | #include <pthread.h> | |
25 | #include <signal.h> | |
26 | #include <stdio.h> | |
27 | #include <stdlib.h> | |
28 | #include <string.h> | |
29 | #include <sys/mman.h> | |
30 | #include <sys/mount.h> | |
31 | #include <sys/resource.h> | |
32 | #include <sys/socket.h> | |
33 | #include <sys/stat.h> | |
34 | #include <sys/types.h> | |
35 | #include <sys/wait.h> | |
36 | #include <inttypes.h> | |
37 | #include <urcu/futex.h> | |
38 | #include <urcu/uatomic.h> | |
7591bab1 | 39 | #include <urcu/rculist.h> |
d3e2ba59 JD |
40 | #include <unistd.h> |
41 | #include <fcntl.h> | |
d3e2ba59 JD |
42 | |
43 | #include <lttng/lttng.h> | |
44 | #include <common/common.h> | |
45 | #include <common/compat/poll.h> | |
46 | #include <common/compat/socket.h> | |
f263b7fd | 47 | #include <common/compat/endian.h> |
d3e2ba59 JD |
48 | #include <common/defaults.h> |
49 | #include <common/futex.h> | |
2f8f53af | 50 | #include <common/index/index.h> |
d3e2ba59 JD |
51 | #include <common/sessiond-comm/sessiond-comm.h> |
52 | #include <common/sessiond-comm/inet.h> | |
53 | #include <common/sessiond-comm/relayd.h> | |
54 | #include <common/uri.h> | |
55 | #include <common/utils.h> | |
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 | ||
464 | /* | |
465 | * Check if the thread quit pipe was triggered. | |
466 | * | |
467 | * Return 1 if it was triggered else 0; | |
468 | */ | |
469 | static | |
bcf4a440 | 470 | int check_thread_quit_pipe(int fd, uint32_t events) |
d3e2ba59 | 471 | { |
bcf4a440 | 472 | if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) { |
d3e2ba59 JD |
473 | return 1; |
474 | } | |
475 | ||
476 | return 0; | |
477 | } | |
478 | ||
8855795d JG |
479 | static |
480 | int create_sock(void *data, int *out_fd) | |
481 | { | |
482 | int ret; | |
483 | struct lttcomm_sock *sock = data; | |
484 | ||
485 | ret = lttcomm_create_sock(sock); | |
486 | if (ret < 0) { | |
487 | goto end; | |
488 | } | |
489 | ||
490 | *out_fd = sock->fd; | |
491 | end: | |
492 | return ret; | |
493 | } | |
494 | ||
495 | static | |
496 | int close_sock(void *data, int *in_fd) | |
497 | { | |
498 | struct lttcomm_sock *sock = data; | |
499 | ||
500 | return sock->ops->close(sock); | |
501 | } | |
502 | ||
d3e2ba59 JD |
503 | /* |
504 | * Create and init socket from uri. | |
505 | */ | |
506 | static | |
8855795d | 507 | struct lttcomm_sock *init_socket(struct lttng_uri *uri, const char *name) |
d3e2ba59 | 508 | { |
8855795d | 509 | int ret, sock_fd; |
d3e2ba59 | 510 | struct lttcomm_sock *sock = NULL; |
8855795d JG |
511 | char uri_str[LTTNG_PATH_MAX]; |
512 | char *formated_name = NULL; | |
d3e2ba59 JD |
513 | |
514 | sock = lttcomm_alloc_sock_from_uri(uri); | |
515 | if (sock == NULL) { | |
516 | ERR("Allocating socket"); | |
517 | goto error; | |
518 | } | |
519 | ||
8855795d JG |
520 | /* |
521 | * Don't fail to create the socket if the name can't be built as it is | |
522 | * only used for debugging purposes. | |
523 | */ | |
524 | ret = uri_to_str_url(uri, uri_str, sizeof(uri_str)); | |
525 | uri_str[sizeof(uri_str) - 1] = '\0'; | |
526 | if (ret >= 0) { | |
527 | ret = asprintf(&formated_name, "%s socket @ %s", name, | |
528 | uri_str); | |
529 | if (ret < 0) { | |
530 | formated_name = NULL; | |
531 | } | |
d3e2ba59 | 532 | } |
8855795d JG |
533 | |
534 | ret = fd_tracker_open_unsuspendable_fd(the_fd_tracker, &sock_fd, | |
535 | (const char **) (formated_name ? &formated_name : NULL), | |
536 | 1, create_sock, sock); | |
537 | free(formated_name); | |
538 | DBG("Listening on %s socket %d", name, sock->fd); | |
d3e2ba59 JD |
539 | |
540 | ret = sock->ops->bind(sock); | |
541 | if (ret < 0) { | |
2288467f | 542 | PERROR("Failed to bind lttng-live socket"); |
d3e2ba59 JD |
543 | goto error; |
544 | } | |
545 | ||
546 | ret = sock->ops->listen(sock, -1); | |
547 | if (ret < 0) { | |
548 | goto error; | |
549 | ||
550 | } | |
551 | ||
552 | return sock; | |
553 | ||
554 | error: | |
555 | if (sock) { | |
556 | lttcomm_destroy_sock(sock); | |
557 | } | |
558 | return NULL; | |
559 | } | |
560 | ||
561 | /* | |
562 | * This thread manages the listening for new connections on the network | |
563 | */ | |
564 | static | |
565 | void *thread_listener(void *data) | |
566 | { | |
567 | int i, ret, pollfd, err = -1; | |
d3e2ba59 JD |
568 | uint32_t revents, nb_fd; |
569 | struct lttng_poll_event events; | |
570 | struct lttcomm_sock *live_control_sock; | |
571 | ||
572 | DBG("[thread] Relay live listener started"); | |
573 | ||
eea7556c MD |
574 | health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_LISTENER); |
575 | ||
576 | health_code_update(); | |
577 | ||
8855795d | 578 | live_control_sock = init_socket(live_uri, "Live listener"); |
d3e2ba59 JD |
579 | if (!live_control_sock) { |
580 | goto error_sock_control; | |
581 | } | |
582 | ||
fb4d42ab | 583 | /* Pass 2 as size here for the thread quit pipe and control sockets. */ |
23f940ff JG |
584 | ret = create_named_thread_poll_set(&events, 2, |
585 | "Live listener thread epoll"); | |
d3e2ba59 JD |
586 | if (ret < 0) { |
587 | goto error_create_poll; | |
588 | } | |
589 | ||
590 | /* Add the control socket */ | |
591 | ret = lttng_poll_add(&events, live_control_sock->fd, LPOLLIN | LPOLLRDHUP); | |
592 | if (ret < 0) { | |
593 | goto error_poll_add; | |
594 | } | |
595 | ||
3fd27398 MD |
596 | lttng_relay_notify_ready(); |
597 | ||
9b5e0863 MD |
598 | if (testpoint(relayd_thread_live_listener)) { |
599 | goto error_testpoint; | |
600 | } | |
601 | ||
d3e2ba59 | 602 | while (1) { |
eea7556c MD |
603 | health_code_update(); |
604 | ||
d3e2ba59 JD |
605 | DBG("Listener accepting live viewers connections"); |
606 | ||
607 | restart: | |
eea7556c | 608 | health_poll_entry(); |
d3e2ba59 | 609 | ret = lttng_poll_wait(&events, -1); |
eea7556c | 610 | health_poll_exit(); |
d3e2ba59 JD |
611 | if (ret < 0) { |
612 | /* | |
613 | * Restart interrupted system call. | |
614 | */ | |
615 | if (errno == EINTR) { | |
616 | goto restart; | |
617 | } | |
618 | goto error; | |
619 | } | |
620 | nb_fd = ret; | |
621 | ||
622 | DBG("Relay new viewer connection received"); | |
623 | for (i = 0; i < nb_fd; i++) { | |
eea7556c MD |
624 | health_code_update(); |
625 | ||
d3e2ba59 JD |
626 | /* Fetch once the poll data */ |
627 | revents = LTTNG_POLL_GETEV(&events, i); | |
628 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
629 | ||
630 | /* Thread quit pipe has been closed. Killing thread. */ | |
bcf4a440 | 631 | ret = check_thread_quit_pipe(pollfd, revents); |
d3e2ba59 JD |
632 | if (ret) { |
633 | err = 0; | |
634 | goto exit; | |
635 | } | |
636 | ||
03e43155 | 637 | if (revents & LPOLLIN) { |
d3e2ba59 | 638 | /* |
7591bab1 MD |
639 | * A new connection is requested, therefore a |
640 | * viewer connection is allocated in this | |
641 | * thread, enqueued to a global queue and | |
642 | * dequeued (and freed) in the worker thread. | |
d3e2ba59 | 643 | */ |
58eb9381 DG |
644 | int val = 1; |
645 | struct relay_connection *new_conn; | |
d3e2ba59 JD |
646 | struct lttcomm_sock *newsock; |
647 | ||
d3e2ba59 JD |
648 | newsock = live_control_sock->ops->accept(live_control_sock); |
649 | if (!newsock) { | |
650 | PERROR("accepting control sock"); | |
d3e2ba59 JD |
651 | goto error; |
652 | } | |
653 | DBG("Relay viewer connection accepted socket %d", newsock->fd); | |
58eb9381 | 654 | |
d3e2ba59 | 655 | ret = setsockopt(newsock->fd, SOL_SOCKET, SO_REUSEADDR, &val, |
58eb9381 | 656 | sizeof(val)); |
d3e2ba59 JD |
657 | if (ret < 0) { |
658 | PERROR("setsockopt inet"); | |
659 | lttcomm_destroy_sock(newsock); | |
d3e2ba59 JD |
660 | goto error; |
661 | } | |
7591bab1 MD |
662 | new_conn = connection_create(newsock, RELAY_CONNECTION_UNKNOWN); |
663 | if (!new_conn) { | |
664 | lttcomm_destroy_sock(newsock); | |
665 | goto error; | |
666 | } | |
667 | /* Ownership assumed by the connection. */ | |
668 | newsock = NULL; | |
d3e2ba59 | 669 | |
58eb9381 | 670 | /* Enqueue request for the dispatcher thread. */ |
8bdee6e2 SM |
671 | cds_wfcq_enqueue(&viewer_conn_queue.head, &viewer_conn_queue.tail, |
672 | &new_conn->qnode); | |
d3e2ba59 JD |
673 | |
674 | /* | |
7591bab1 MD |
675 | * Wake the dispatch queue futex. |
676 | * Implicit memory barrier with the | |
677 | * exchange in cds_wfcq_enqueue. | |
d3e2ba59 | 678 | */ |
58eb9381 | 679 | futex_nto1_wake(&viewer_conn_queue.futex); |
03e43155 MD |
680 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
681 | ERR("socket poll error"); | |
682 | goto error; | |
683 | } else { | |
684 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
685 | goto error; | |
d3e2ba59 JD |
686 | } |
687 | } | |
688 | } | |
689 | ||
690 | exit: | |
691 | error: | |
692 | error_poll_add: | |
9b5e0863 | 693 | error_testpoint: |
23f940ff | 694 | (void) fd_tracker_util_poll_clean(the_fd_tracker, &events); |
d3e2ba59 JD |
695 | error_create_poll: |
696 | if (live_control_sock->fd >= 0) { | |
8855795d JG |
697 | int sock_fd = live_control_sock->fd; |
698 | ||
699 | ret = fd_tracker_close_unsuspendable_fd(the_fd_tracker, | |
700 | &sock_fd, 1, close_sock, | |
701 | live_control_sock); | |
d3e2ba59 JD |
702 | if (ret) { |
703 | PERROR("close"); | |
704 | } | |
8855795d | 705 | live_control_sock->fd = -1; |
d3e2ba59 JD |
706 | } |
707 | lttcomm_destroy_sock(live_control_sock); | |
708 | error_sock_control: | |
709 | if (err) { | |
eea7556c | 710 | health_error(); |
d3e2ba59 JD |
711 | DBG("Live viewer listener thread exited with error"); |
712 | } | |
eea7556c | 713 | health_unregister(health_relayd); |
d3e2ba59 | 714 | DBG("Live viewer listener thread cleanup complete"); |
b4aacfdc MD |
715 | if (lttng_relay_stop_threads()) { |
716 | ERR("Error stopping threads"); | |
178a0557 | 717 | } |
d3e2ba59 JD |
718 | return NULL; |
719 | } | |
720 | ||
721 | /* | |
722 | * This thread manages the dispatching of the requests to worker threads | |
723 | */ | |
724 | static | |
725 | void *thread_dispatcher(void *data) | |
726 | { | |
6cd525e8 MD |
727 | int err = -1; |
728 | ssize_t ret; | |
8bdee6e2 | 729 | struct cds_wfcq_node *node; |
58eb9381 | 730 | struct relay_connection *conn = NULL; |
d3e2ba59 JD |
731 | |
732 | DBG("[thread] Live viewer relay dispatcher started"); | |
733 | ||
eea7556c MD |
734 | health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_DISPATCHER); |
735 | ||
9b5e0863 MD |
736 | if (testpoint(relayd_thread_live_dispatcher)) { |
737 | goto error_testpoint; | |
738 | } | |
739 | ||
eea7556c MD |
740 | health_code_update(); |
741 | ||
0ed3b1a8 | 742 | for (;;) { |
eea7556c MD |
743 | health_code_update(); |
744 | ||
d3e2ba59 | 745 | /* Atomically prepare the queue futex */ |
58eb9381 | 746 | futex_nto1_prepare(&viewer_conn_queue.futex); |
d3e2ba59 | 747 | |
0ed3b1a8 MD |
748 | if (CMM_LOAD_SHARED(live_dispatch_thread_exit)) { |
749 | break; | |
750 | } | |
751 | ||
d3e2ba59 | 752 | do { |
eea7556c MD |
753 | health_code_update(); |
754 | ||
d3e2ba59 | 755 | /* Dequeue commands */ |
8bdee6e2 SM |
756 | node = cds_wfcq_dequeue_blocking(&viewer_conn_queue.head, |
757 | &viewer_conn_queue.tail); | |
d3e2ba59 JD |
758 | if (node == NULL) { |
759 | DBG("Woken up but nothing in the live-viewer " | |
760 | "relay command queue"); | |
761 | /* Continue thread execution */ | |
762 | break; | |
763 | } | |
58eb9381 | 764 | conn = caa_container_of(node, struct relay_connection, qnode); |
d3e2ba59 | 765 | DBG("Dispatching viewer request waiting on sock %d", |
58eb9381 | 766 | conn->sock->fd); |
d3e2ba59 JD |
767 | |
768 | /* | |
7591bab1 MD |
769 | * Inform worker thread of the new request. This |
770 | * call is blocking so we can be assured that | |
771 | * the data will be read at some point in time | |
772 | * or wait to the end of the world :) | |
d3e2ba59 | 773 | */ |
58eb9381 DG |
774 | ret = lttng_write(live_conn_pipe[1], &conn, sizeof(conn)); |
775 | if (ret < 0) { | |
776 | PERROR("write conn pipe"); | |
7591bab1 | 777 | connection_put(conn); |
d3e2ba59 JD |
778 | goto error; |
779 | } | |
780 | } while (node != NULL); | |
781 | ||
782 | /* Futex wait on queue. Blocking call on futex() */ | |
eea7556c | 783 | health_poll_entry(); |
58eb9381 | 784 | futex_nto1_wait(&viewer_conn_queue.futex); |
eea7556c | 785 | health_poll_exit(); |
d3e2ba59 JD |
786 | } |
787 | ||
eea7556c MD |
788 | /* Normal exit, no error */ |
789 | err = 0; | |
790 | ||
d3e2ba59 | 791 | error: |
9b5e0863 | 792 | error_testpoint: |
eea7556c MD |
793 | if (err) { |
794 | health_error(); | |
795 | ERR("Health error occurred in %s", __func__); | |
796 | } | |
797 | health_unregister(health_relayd); | |
d3e2ba59 | 798 | DBG("Live viewer dispatch thread dying"); |
b4aacfdc MD |
799 | if (lttng_relay_stop_threads()) { |
800 | ERR("Error stopping threads"); | |
178a0557 | 801 | } |
d3e2ba59 JD |
802 | return NULL; |
803 | } | |
804 | ||
805 | /* | |
806 | * Establish connection with the viewer and check the versions. | |
807 | * | |
808 | * Return 0 on success or else negative value. | |
809 | */ | |
810 | static | |
58eb9381 | 811 | int viewer_connect(struct relay_connection *conn) |
d3e2ba59 JD |
812 | { |
813 | int ret; | |
814 | struct lttng_viewer_connect reply, msg; | |
815 | ||
58eb9381 | 816 | conn->version_check_done = 1; |
d3e2ba59 | 817 | |
eea7556c MD |
818 | health_code_update(); |
819 | ||
2f8f53af DG |
820 | DBG("Viewer is establishing a connection to the relayd."); |
821 | ||
58eb9381 | 822 | ret = recv_request(conn->sock, &msg, sizeof(msg)); |
2f8f53af | 823 | if (ret < 0) { |
d3e2ba59 JD |
824 | goto end; |
825 | } | |
826 | ||
eea7556c MD |
827 | health_code_update(); |
828 | ||
f46b2ce6 | 829 | memset(&reply, 0, sizeof(reply)); |
d3e2ba59 JD |
830 | reply.major = RELAYD_VERSION_COMM_MAJOR; |
831 | reply.minor = RELAYD_VERSION_COMM_MINOR; | |
832 | ||
833 | /* Major versions must be the same */ | |
834 | if (reply.major != be32toh(msg.major)) { | |
2f8f53af DG |
835 | DBG("Incompatible major versions ([relayd] %u vs [client] %u)", |
836 | reply.major, be32toh(msg.major)); | |
72180669 | 837 | ret = -1; |
d3e2ba59 JD |
838 | goto end; |
839 | } | |
840 | ||
58eb9381 | 841 | conn->major = reply.major; |
d3e2ba59 JD |
842 | /* We adapt to the lowest compatible version */ |
843 | if (reply.minor <= be32toh(msg.minor)) { | |
58eb9381 | 844 | conn->minor = reply.minor; |
d3e2ba59 | 845 | } else { |
58eb9381 | 846 | conn->minor = be32toh(msg.minor); |
d3e2ba59 JD |
847 | } |
848 | ||
c4e361a4 | 849 | if (be32toh(msg.type) == LTTNG_VIEWER_CLIENT_COMMAND) { |
58eb9381 | 850 | conn->type = RELAY_VIEWER_COMMAND; |
c4e361a4 | 851 | } else if (be32toh(msg.type) == LTTNG_VIEWER_CLIENT_NOTIFICATION) { |
58eb9381 | 852 | conn->type = RELAY_VIEWER_NOTIFICATION; |
d3e2ba59 JD |
853 | } else { |
854 | ERR("Unknown connection type : %u", be32toh(msg.type)); | |
855 | ret = -1; | |
856 | goto end; | |
857 | } | |
858 | ||
859 | reply.major = htobe32(reply.major); | |
860 | reply.minor = htobe32(reply.minor); | |
58eb9381 | 861 | if (conn->type == RELAY_VIEWER_COMMAND) { |
93b4787b | 862 | /* |
7591bab1 MD |
863 | * Increment outside of htobe64 macro, because the argument can |
864 | * be used more than once within the macro, and thus the | |
865 | * operation may be undefined. | |
93b4787b | 866 | */ |
7591bab1 | 867 | pthread_mutex_lock(&last_relay_viewer_session_id_lock); |
93b4787b | 868 | last_relay_viewer_session_id++; |
7591bab1 | 869 | pthread_mutex_unlock(&last_relay_viewer_session_id_lock); |
93b4787b | 870 | reply.viewer_session_id = htobe64(last_relay_viewer_session_id); |
d3e2ba59 | 871 | } |
eea7556c MD |
872 | |
873 | health_code_update(); | |
874 | ||
58eb9381 | 875 | ret = send_response(conn->sock, &reply, sizeof(reply)); |
d3e2ba59 | 876 | if (ret < 0) { |
2f8f53af | 877 | goto end; |
d3e2ba59 JD |
878 | } |
879 | ||
eea7556c MD |
880 | health_code_update(); |
881 | ||
58eb9381 | 882 | DBG("Version check done using protocol %u.%u", conn->major, conn->minor); |
d3e2ba59 JD |
883 | ret = 0; |
884 | ||
885 | end: | |
886 | return ret; | |
887 | } | |
888 | ||
889 | /* | |
890 | * Send the viewer the list of current sessions. | |
7591bab1 MD |
891 | * We need to create a copy of the hash table content because otherwise |
892 | * we cannot assume the number of entries stays the same between getting | |
893 | * the number of HT elements and iteration over the HT. | |
d3e2ba59 JD |
894 | * |
895 | * Return 0 on success or else a negative value. | |
896 | */ | |
897 | static | |
58eb9381 | 898 | int viewer_list_sessions(struct relay_connection *conn) |
d3e2ba59 | 899 | { |
5f10c6b1 | 900 | int ret = 0; |
d3e2ba59 | 901 | struct lttng_viewer_list_sessions session_list; |
d3e2ba59 | 902 | struct lttng_ht_iter iter; |
d3e2ba59 | 903 | struct relay_session *session; |
7591bab1 MD |
904 | struct lttng_viewer_session *send_session_buf = NULL; |
905 | uint32_t buf_count = SESSION_BUF_DEFAULT_COUNT; | |
906 | uint32_t count = 0; | |
d3e2ba59 JD |
907 | |
908 | DBG("List sessions received"); | |
909 | ||
7591bab1 MD |
910 | send_session_buf = zmalloc(SESSION_BUF_DEFAULT_COUNT * sizeof(*send_session_buf)); |
911 | if (!send_session_buf) { | |
912 | return -1; | |
d3e2ba59 JD |
913 | } |
914 | ||
7591bab1 MD |
915 | rcu_read_lock(); |
916 | cds_lfht_for_each_entry(sessions_ht->ht, &iter.iter, session, | |
2f8f53af | 917 | session_n.node) { |
7591bab1 | 918 | struct lttng_viewer_session *send_session; |
d3e2ba59 | 919 | |
eea7556c MD |
920 | health_code_update(); |
921 | ||
d995f382 | 922 | pthread_mutex_lock(&session->lock); |
7e0a4379 JR |
923 | if (session->connection_closed) { |
924 | /* Skip closed session */ | |
d995f382 JG |
925 | goto next_session; |
926 | } | |
927 | if (!session->current_trace_chunk) { | |
928 | /* | |
929 | * Skip un-attachable session. It is either | |
930 | * being destroyed or has not had a trace | |
931 | * chunk created against it yet. | |
932 | */ | |
933 | goto next_session; | |
7e0a4379 JR |
934 | } |
935 | ||
7591bab1 MD |
936 | if (count >= buf_count) { |
937 | struct lttng_viewer_session *newbuf; | |
938 | uint32_t new_buf_count = buf_count << 1; | |
eea7556c | 939 | |
7591bab1 MD |
940 | newbuf = realloc(send_session_buf, |
941 | new_buf_count * sizeof(*send_session_buf)); | |
942 | if (!newbuf) { | |
943 | ret = -1; | |
d995f382 | 944 | goto break_loop; |
7591bab1 MD |
945 | } |
946 | send_session_buf = newbuf; | |
947 | buf_count = new_buf_count; | |
6763619c | 948 | } |
7591bab1 | 949 | send_session = &send_session_buf[count]; |
bfc3fb17 MD |
950 | if (lttng_strncpy(send_session->session_name, |
951 | session->session_name, | |
952 | sizeof(send_session->session_name))) { | |
953 | ret = -1; | |
d995f382 | 954 | goto break_loop; |
bfc3fb17 MD |
955 | } |
956 | if (lttng_strncpy(send_session->hostname, session->hostname, | |
957 | sizeof(send_session->hostname))) { | |
958 | ret = -1; | |
d995f382 | 959 | goto break_loop; |
bfc3fb17 | 960 | } |
7591bab1 MD |
961 | send_session->id = htobe64(session->id); |
962 | send_session->live_timer = htobe32(session->live_timer); | |
963 | if (session->viewer_attached) { | |
964 | send_session->clients = htobe32(1); | |
965 | } else { | |
966 | send_session->clients = htobe32(0); | |
d227d5bd | 967 | } |
7591bab1 MD |
968 | send_session->streams = htobe32(session->stream_count); |
969 | count++; | |
d995f382 JG |
970 | next_session: |
971 | pthread_mutex_unlock(&session->lock); | |
972 | continue; | |
973 | break_loop: | |
974 | pthread_mutex_unlock(&session->lock); | |
975 | break; | |
7591bab1 MD |
976 | } |
977 | rcu_read_unlock(); | |
5f10c6b1 JG |
978 | if (ret < 0) { |
979 | goto end_free; | |
980 | } | |
d227d5bd | 981 | |
7591bab1 | 982 | session_list.sessions_count = htobe32(count); |
d227d5bd | 983 | |
7591bab1 | 984 | health_code_update(); |
d227d5bd | 985 | |
7591bab1 MD |
986 | ret = send_response(conn->sock, &session_list, sizeof(session_list)); |
987 | if (ret < 0) { | |
988 | goto end_free; | |
d227d5bd | 989 | } |
d227d5bd | 990 | |
7591bab1 | 991 | health_code_update(); |
d227d5bd | 992 | |
7591bab1 MD |
993 | ret = send_response(conn->sock, send_session_buf, |
994 | count * sizeof(*send_session_buf)); | |
995 | if (ret < 0) { | |
996 | goto end_free; | |
d227d5bd | 997 | } |
7591bab1 | 998 | health_code_update(); |
d227d5bd | 999 | |
7591bab1 MD |
1000 | ret = 0; |
1001 | end_free: | |
1002 | free(send_session_buf); | |
1003 | return ret; | |
d227d5bd JD |
1004 | } |
1005 | ||
80e8027a | 1006 | /* |
7591bab1 | 1007 | * Send the viewer the list of current streams. |
80e8027a JD |
1008 | */ |
1009 | static | |
58eb9381 | 1010 | int viewer_get_new_streams(struct relay_connection *conn) |
80e8027a JD |
1011 | { |
1012 | int ret, send_streams = 0; | |
7591bab1 | 1013 | uint32_t nb_created = 0, nb_unsent = 0, nb_streams = 0, nb_total = 0; |
80e8027a JD |
1014 | struct lttng_viewer_new_streams_request request; |
1015 | struct lttng_viewer_new_streams_response response; | |
b66a15d1 | 1016 | struct relay_session *session = NULL; |
6763619c | 1017 | uint64_t session_id; |
bddf80e4 | 1018 | bool closed = false; |
80e8027a | 1019 | |
58eb9381 | 1020 | assert(conn); |
80e8027a JD |
1021 | |
1022 | DBG("Get new streams received"); | |
1023 | ||
80e8027a JD |
1024 | health_code_update(); |
1025 | ||
2f8f53af | 1026 | /* Receive the request from the connected client. */ |
58eb9381 | 1027 | ret = recv_request(conn->sock, &request, sizeof(request)); |
2f8f53af | 1028 | if (ret < 0) { |
80e8027a JD |
1029 | goto error; |
1030 | } | |
6763619c | 1031 | session_id = be64toh(request.session_id); |
80e8027a JD |
1032 | |
1033 | health_code_update(); | |
1034 | ||
53efb85a MD |
1035 | memset(&response, 0, sizeof(response)); |
1036 | ||
7591bab1 | 1037 | session = session_get_by_id(session_id); |
2f8f53af | 1038 | if (!session) { |
6763619c | 1039 | DBG("Relay session %" PRIu64 " not found", session_id); |
c4e361a4 | 1040 | response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_ERR); |
80e8027a JD |
1041 | goto send_reply; |
1042 | } | |
1043 | ||
7591bab1 | 1044 | if (!viewer_session_is_attached(conn->viewer_session, session)) { |
c4e361a4 | 1045 | response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_ERR); |
80e8027a JD |
1046 | goto send_reply; |
1047 | } | |
1048 | ||
c06fdd95 | 1049 | pthread_mutex_lock(&session->lock); |
b66a15d1 JG |
1050 | ret = make_viewer_streams(session, |
1051 | conn->viewer_session->current_trace_chunk, | |
1052 | LTTNG_VIEWER_SEEK_LAST, &nb_total, &nb_unsent, | |
bddf80e4 | 1053 | &nb_created, &closed); |
2f8f53af | 1054 | if (ret < 0) { |
b66a15d1 | 1055 | goto error_unlock_session; |
2f8f53af | 1056 | } |
3d0bbd40 JG |
1057 | send_streams = 1; |
1058 | response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_OK); | |
b66a15d1 | 1059 | |
2f8f53af DG |
1060 | /* Only send back the newly created streams with the unsent ones. */ |
1061 | nb_streams = nb_created + nb_unsent; | |
80e8027a JD |
1062 | response.streams_count = htobe32(nb_streams); |
1063 | ||
4479f682 | 1064 | /* |
2229a09c MD |
1065 | * If the session is closed, HUP when there are no more streams |
1066 | * with data. | |
4479f682 | 1067 | */ |
bddf80e4 | 1068 | if (closed && nb_total == 0) { |
4479f682 | 1069 | send_streams = 0; |
bddf80e4 | 1070 | response.streams_count = 0; |
4479f682 | 1071 | response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_HUP); |
3d0bbd40 | 1072 | goto send_reply_unlock; |
4479f682 | 1073 | } |
3d0bbd40 JG |
1074 | send_reply_unlock: |
1075 | pthread_mutex_unlock(&session->lock); | |
4479f682 | 1076 | |
80e8027a JD |
1077 | send_reply: |
1078 | health_code_update(); | |
58eb9381 | 1079 | ret = send_response(conn->sock, &response, sizeof(response)); |
80e8027a | 1080 | if (ret < 0) { |
7591bab1 | 1081 | goto end_put_session; |
80e8027a JD |
1082 | } |
1083 | health_code_update(); | |
1084 | ||
1085 | /* | |
7591bab1 MD |
1086 | * Unknown or empty session, just return gracefully, the viewer |
1087 | * knows what is happening. | |
80e8027a JD |
1088 | */ |
1089 | if (!send_streams || !nb_streams) { | |
1090 | ret = 0; | |
7591bab1 | 1091 | goto end_put_session; |
80e8027a JD |
1092 | } |
1093 | ||
2f8f53af | 1094 | /* |
7591bab1 MD |
1095 | * Send stream and *DON'T* ignore the sent flag so every viewer |
1096 | * streams that were not sent from that point will be sent to | |
1097 | * the viewer. | |
2f8f53af | 1098 | */ |
c06fdd95 | 1099 | ret = send_viewer_streams(conn->sock, session_id, 0); |
2f8f53af | 1100 | if (ret < 0) { |
7591bab1 | 1101 | goto end_put_session; |
80e8027a JD |
1102 | } |
1103 | ||
7591bab1 MD |
1104 | end_put_session: |
1105 | if (session) { | |
1106 | session_put(session); | |
1107 | } | |
80e8027a JD |
1108 | error: |
1109 | return ret; | |
b66a15d1 JG |
1110 | error_unlock_session: |
1111 | pthread_mutex_unlock(&session->lock); | |
1112 | session_put(session); | |
1113 | return ret; | |
80e8027a JD |
1114 | } |
1115 | ||
d3e2ba59 JD |
1116 | /* |
1117 | * Send the viewer the list of current sessions. | |
1118 | */ | |
1119 | static | |
58eb9381 | 1120 | int viewer_attach_session(struct relay_connection *conn) |
d3e2ba59 | 1121 | { |
2f8f53af DG |
1122 | int send_streams = 0; |
1123 | ssize_t ret; | |
80e8027a | 1124 | uint32_t nb_streams = 0; |
2f8f53af | 1125 | enum lttng_viewer_seek seek_type; |
d3e2ba59 JD |
1126 | struct lttng_viewer_attach_session_request request; |
1127 | struct lttng_viewer_attach_session_response response; | |
7591bab1 | 1128 | struct relay_session *session = NULL; |
dbd6665b | 1129 | enum lttng_viewer_attach_return_code viewer_attach_status; |
bddf80e4 | 1130 | bool closed = false; |
c06fdd95 | 1131 | uint64_t session_id; |
d3e2ba59 | 1132 | |
58eb9381 | 1133 | assert(conn); |
d3e2ba59 | 1134 | |
eea7556c MD |
1135 | health_code_update(); |
1136 | ||
2f8f53af | 1137 | /* Receive the request from the connected client. */ |
58eb9381 | 1138 | ret = recv_request(conn->sock, &request, sizeof(request)); |
2f8f53af | 1139 | if (ret < 0) { |
d3e2ba59 JD |
1140 | goto error; |
1141 | } | |
1142 | ||
c06fdd95 | 1143 | session_id = be64toh(request.session_id); |
eea7556c MD |
1144 | health_code_update(); |
1145 | ||
53efb85a MD |
1146 | memset(&response, 0, sizeof(response)); |
1147 | ||
c3b7390b JD |
1148 | if (!conn->viewer_session) { |
1149 | DBG("Client trying to attach before creating a live viewer session"); | |
1150 | response.status = htobe32(LTTNG_VIEWER_ATTACH_NO_SESSION); | |
1151 | goto send_reply; | |
1152 | } | |
1153 | ||
c06fdd95 | 1154 | session = session_get_by_id(session_id); |
2f8f53af | 1155 | if (!session) { |
c06fdd95 | 1156 | DBG("Relay session %" PRIu64 " not found", session_id); |
c4e361a4 | 1157 | response.status = htobe32(LTTNG_VIEWER_ATTACH_UNK); |
d3e2ba59 JD |
1158 | goto send_reply; |
1159 | } | |
c06fdd95 | 1160 | DBG("Attach session ID %" PRIu64 " received", session_id); |
d3e2ba59 | 1161 | |
c06fdd95 | 1162 | pthread_mutex_lock(&session->lock); |
79a42980 JG |
1163 | if (!session->current_trace_chunk) { |
1164 | /* | |
1165 | * Session is either being destroyed or it never had a trace | |
1166 | * chunk created against it. | |
1167 | */ | |
1168 | DBG("Session requested by live client has no current trace chunk, returning unknown session"); | |
1169 | response.status = htobe32(LTTNG_VIEWER_ATTACH_UNK); | |
1170 | goto send_reply; | |
1171 | } | |
7591bab1 | 1172 | if (session->live_timer == 0) { |
d3e2ba59 | 1173 | DBG("Not live session"); |
c4e361a4 | 1174 | response.status = htobe32(LTTNG_VIEWER_ATTACH_NOT_LIVE); |
d3e2ba59 | 1175 | goto send_reply; |
7591bab1 MD |
1176 | } |
1177 | ||
1178 | send_streams = 1; | |
dbd6665b JG |
1179 | viewer_attach_status = viewer_session_attach(conn->viewer_session, |
1180 | session); | |
1181 | if (viewer_attach_status != LTTNG_VIEWER_ATTACH_OK) { | |
1182 | response.status = htobe32(viewer_attach_status); | |
7591bab1 | 1183 | goto send_reply; |
d3e2ba59 JD |
1184 | } |
1185 | ||
1186 | switch (be32toh(request.seek)) { | |
c4e361a4 JD |
1187 | case LTTNG_VIEWER_SEEK_BEGINNING: |
1188 | case LTTNG_VIEWER_SEEK_LAST: | |
7591bab1 | 1189 | response.status = htobe32(LTTNG_VIEWER_ATTACH_OK); |
2f8f53af | 1190 | seek_type = be32toh(request.seek); |
d3e2ba59 JD |
1191 | break; |
1192 | default: | |
1193 | ERR("Wrong seek parameter"); | |
c4e361a4 | 1194 | response.status = htobe32(LTTNG_VIEWER_ATTACH_SEEK_ERR); |
d3e2ba59 JD |
1195 | send_streams = 0; |
1196 | goto send_reply; | |
1197 | } | |
1198 | ||
b66a15d1 JG |
1199 | ret = make_viewer_streams(session, |
1200 | conn->viewer_session->current_trace_chunk, seek_type, | |
1201 | &nb_streams, NULL, NULL, &closed); | |
2f8f53af | 1202 | if (ret < 0) { |
7591bab1 | 1203 | goto end_put_session; |
d3e2ba59 | 1204 | } |
c06fdd95 JG |
1205 | pthread_mutex_unlock(&session->lock); |
1206 | session_put(session); | |
1207 | session = NULL; | |
1208 | ||
1209 | response.streams_count = htobe32(nb_streams); | |
bddf80e4 MD |
1210 | /* |
1211 | * If the session is closed when the viewer is attaching, it | |
1212 | * means some of the streams may have been concurrently removed, | |
1213 | * so we don't allow the viewer to attach, even if there are | |
1214 | * streams available. | |
1215 | */ | |
1216 | if (closed) { | |
1217 | send_streams = 0; | |
1218 | response.streams_count = 0; | |
06079f15 | 1219 | response.status = htobe32(LTTNG_VIEWER_ATTACH_UNK); |
bddf80e4 MD |
1220 | goto send_reply; |
1221 | } | |
1222 | ||
d3e2ba59 | 1223 | send_reply: |
eea7556c | 1224 | health_code_update(); |
58eb9381 | 1225 | ret = send_response(conn->sock, &response, sizeof(response)); |
d3e2ba59 | 1226 | if (ret < 0) { |
7591bab1 | 1227 | goto end_put_session; |
d3e2ba59 | 1228 | } |
eea7556c | 1229 | health_code_update(); |
d3e2ba59 JD |
1230 | |
1231 | /* | |
7591bab1 MD |
1232 | * Unknown or empty session, just return gracefully, the viewer |
1233 | * knows what is happening. | |
d3e2ba59 | 1234 | */ |
157df586 | 1235 | if (!send_streams || !nb_streams) { |
d3e2ba59 | 1236 | ret = 0; |
7591bab1 | 1237 | goto end_put_session; |
d3e2ba59 JD |
1238 | } |
1239 | ||
2f8f53af | 1240 | /* Send stream and ignore the sent flag. */ |
c06fdd95 | 1241 | ret = send_viewer_streams(conn->sock, session_id, 1); |
2f8f53af | 1242 | if (ret < 0) { |
7591bab1 | 1243 | goto end_put_session; |
d3e2ba59 | 1244 | } |
d3e2ba59 | 1245 | |
7591bab1 MD |
1246 | end_put_session: |
1247 | if (session) { | |
c06fdd95 | 1248 | pthread_mutex_unlock(&session->lock); |
7591bab1 MD |
1249 | session_put(session); |
1250 | } | |
4a9daf17 JD |
1251 | error: |
1252 | return ret; | |
1253 | } | |
1254 | ||
878c34cf DG |
1255 | /* |
1256 | * Open the index file if needed for the given vstream. | |
1257 | * | |
f8f3885c MD |
1258 | * If an index file is successfully opened, the vstream will set it as its |
1259 | * current index file. | |
878c34cf DG |
1260 | * |
1261 | * Return 0 on success, a negative value on error (-ENOENT if not ready yet). | |
7591bab1 MD |
1262 | * |
1263 | * Called with rstream lock held. | |
878c34cf DG |
1264 | */ |
1265 | static int try_open_index(struct relay_viewer_stream *vstream, | |
1266 | struct relay_stream *rstream) | |
1267 | { | |
1268 | int ret = 0; | |
ebb29c10 JG |
1269 | const uint32_t connection_major = rstream->trace->session->major; |
1270 | const uint32_t connection_minor = rstream->trace->session->minor; | |
3ff5c5db | 1271 | enum lttng_trace_chunk_status chunk_status; |
878c34cf | 1272 | |
f8f3885c | 1273 | if (vstream->index_file) { |
878c34cf DG |
1274 | goto end; |
1275 | } | |
1276 | ||
1277 | /* | |
7591bab1 | 1278 | * First time, we open the index file and at least one index is ready. |
878c34cf | 1279 | */ |
a44ca2ca | 1280 | if (rstream->index_received_seqcount == 0) { |
878c34cf DG |
1281 | ret = -ENOENT; |
1282 | goto end; | |
1283 | } | |
3ff5c5db | 1284 | chunk_status = lttng_index_file_create_from_trace_chunk_read_only( |
b66a15d1 | 1285 | vstream->stream_file.trace_chunk, rstream->path_name, |
ebb29c10 JG |
1286 | rstream->channel_name, rstream->tracefile_size, |
1287 | vstream->current_tracefile_id, | |
1288 | lttng_to_index_major(connection_major, connection_minor), | |
3ff5c5db MD |
1289 | lttng_to_index_minor(connection_major, connection_minor), |
1290 | true, &vstream->index_file); | |
1291 | if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { | |
1292 | if (chunk_status == LTTNG_TRACE_CHUNK_STATUS_NO_FILE) { | |
1293 | ret = -ENOENT; | |
1294 | } else { | |
1295 | ret = -1; | |
1296 | } | |
878c34cf DG |
1297 | } |
1298 | ||
1299 | end: | |
1300 | return ret; | |
1301 | } | |
1302 | ||
1303 | /* | |
7591bab1 MD |
1304 | * Check the status of the index for the given stream. This function |
1305 | * updates the index structure if needed and can put (close) the vstream | |
1306 | * in the HUP situation. | |
1307 | * | |
1308 | * Return 0 means that we can proceed with the index. A value of 1 means | |
1309 | * that the index has been updated and is ready to be sent to the | |
1310 | * client. A negative value indicates an error that can't be handled. | |
878c34cf | 1311 | * |
7591bab1 | 1312 | * Called with rstream lock held. |
878c34cf DG |
1313 | */ |
1314 | static int check_index_status(struct relay_viewer_stream *vstream, | |
1315 | struct relay_stream *rstream, struct ctf_trace *trace, | |
1316 | struct lttng_viewer_index *index) | |
1317 | { | |
1318 | int ret; | |
1319 | ||
68c40154 MD |
1320 | DBG("Check index status: index_received_seqcount %" PRIu64 " " |
1321 | "index_sent_seqcount %" PRIu64 " " | |
1322 | "for stream %" PRIu64, | |
1323 | rstream->index_received_seqcount, | |
1324 | vstream->index_sent_seqcount, | |
1325 | vstream->stream->stream_handle); | |
797bc362 | 1326 | if ((trace->session->connection_closed || rstream->closed) |
a44ca2ca MD |
1327 | && rstream->index_received_seqcount |
1328 | == vstream->index_sent_seqcount) { | |
797bc362 MD |
1329 | /* |
1330 | * Last index sent and session connection or relay | |
1331 | * stream are closed. | |
1332 | */ | |
7591bab1 MD |
1333 | index->status = htobe32(LTTNG_VIEWER_INDEX_HUP); |
1334 | goto hup; | |
1335 | } else if (rstream->beacon_ts_end != -1ULL && | |
b0d240a2 MD |
1336 | (rstream->index_received_seqcount == 0 || |
1337 | (vstream->index_sent_seqcount != 0 && | |
a44ca2ca | 1338 | rstream->index_received_seqcount |
b0d240a2 | 1339 | <= vstream->index_sent_seqcount))) { |
7591bab1 MD |
1340 | /* |
1341 | * We've received a synchronization beacon and the last index | |
1342 | * available has been sent, the index for now is inactive. | |
1343 | * | |
1344 | * In this case, we have received a beacon which allows us to | |
1345 | * inform the client of a time interval during which we can | |
1346 | * guarantee that there are no events to read (and never will | |
1347 | * be). | |
b0d240a2 MD |
1348 | * |
1349 | * The sent seqcount can grow higher than receive seqcount on | |
1350 | * clear because the rotation performed by clear will push | |
1351 | * the index_sent_seqcount ahead (see | |
1352 | * viewer_stream_sync_tracefile_array_tail) and skip over | |
1353 | * packet sequence numbers. | |
7591bab1 MD |
1354 | */ |
1355 | index->status = htobe32(LTTNG_VIEWER_INDEX_INACTIVE); | |
1356 | index->timestamp_end = htobe64(rstream->beacon_ts_end); | |
1357 | index->stream_id = htobe64(rstream->ctf_stream_id); | |
68c40154 MD |
1358 | DBG("Check index status: inactive with beacon, for stream %" PRIu64, |
1359 | vstream->stream->stream_handle); | |
7591bab1 | 1360 | goto index_ready; |
b0d240a2 MD |
1361 | } else if (rstream->index_received_seqcount == 0 || |
1362 | (vstream->index_sent_seqcount != 0 && | |
1363 | rstream->index_received_seqcount | |
1364 | <= vstream->index_sent_seqcount)) { | |
7591bab1 | 1365 | /* |
b0d240a2 | 1366 | * This checks whether received <= sent seqcount. In |
a44ca2ca MD |
1367 | * this case, we have not received a beacon. Therefore, |
1368 | * we can only ask the client to retry later. | |
b0d240a2 MD |
1369 | * |
1370 | * The sent seqcount can grow higher than receive seqcount on | |
1371 | * clear because the rotation performed by clear will push | |
1372 | * the index_sent_seqcount ahead (see | |
1373 | * viewer_stream_sync_tracefile_array_tail) and skip over | |
1374 | * packet sequence numbers. | |
7591bab1 MD |
1375 | */ |
1376 | index->status = htobe32(LTTNG_VIEWER_INDEX_RETRY); | |
68c40154 MD |
1377 | DBG("Check index status: retry for stream %" PRIu64, |
1378 | vstream->stream->stream_handle); | |
7591bab1 | 1379 | goto index_ready; |
a44ca2ca MD |
1380 | } else if (!tracefile_array_seq_in_file(rstream->tfa, |
1381 | vstream->current_tracefile_id, | |
1382 | vstream->index_sent_seqcount)) { | |
7591bab1 | 1383 | /* |
a44ca2ca MD |
1384 | * The next index we want to send cannot be read either |
1385 | * because we need to perform a rotation, or due to | |
1386 | * the producer having overwritten its trace file. | |
7591bab1 | 1387 | */ |
a44ca2ca | 1388 | DBG("Viewer stream %" PRIu64 " rotation", |
7591bab1 MD |
1389 | vstream->stream->stream_handle); |
1390 | ret = viewer_stream_rotate(vstream); | |
b0d240a2 | 1391 | if (ret == 1) { |
7591bab1 MD |
1392 | /* EOF across entire stream. */ |
1393 | index->status = htobe32(LTTNG_VIEWER_INDEX_HUP); | |
1394 | goto hup; | |
1395 | } | |
7591bab1 | 1396 | /* |
a44ca2ca MD |
1397 | * If we have been pushed due to overwrite, it |
1398 | * necessarily means there is data that can be read in | |
1399 | * the stream. If we rotated because we reached the end | |
1400 | * of a tracefile, it means the following tracefile | |
1401 | * needs to contain at least one index, else we would | |
1402 | * have already returned LTTNG_VIEWER_INDEX_RETRY to the | |
1403 | * viewer. The updated index_sent_seqcount needs to | |
1404 | * point to a readable index entry now. | |
1405 | * | |
1406 | * In the case where we "rotate" on a single file, we | |
1407 | * can end up in a case where the requested index is | |
1408 | * still unavailable. | |
7591bab1 | 1409 | */ |
a44ca2ca MD |
1410 | if (rstream->tracefile_count == 1 && |
1411 | !tracefile_array_seq_in_file( | |
1412 | rstream->tfa, | |
1413 | vstream->current_tracefile_id, | |
1414 | vstream->index_sent_seqcount)) { | |
1415 | index->status = htobe32(LTTNG_VIEWER_INDEX_RETRY); | |
68c40154 MD |
1416 | DBG("Check index status: retry: " |
1417 | "tracefile array sequence number %" PRIu64 | |
1418 | " not in file for stream %" PRIu64, | |
1419 | vstream->index_sent_seqcount, | |
1420 | vstream->stream->stream_handle); | |
a44ca2ca | 1421 | goto index_ready; |
878c34cf | 1422 | } |
a44ca2ca MD |
1423 | assert(tracefile_array_seq_in_file(rstream->tfa, |
1424 | vstream->current_tracefile_id, | |
1425 | vstream->index_sent_seqcount)); | |
878c34cf | 1426 | } |
a44ca2ca MD |
1427 | /* ret == 0 means successful so we continue. */ |
1428 | ret = 0; | |
878c34cf DG |
1429 | return ret; |
1430 | ||
1431 | hup: | |
7591bab1 | 1432 | viewer_stream_put(vstream); |
878c34cf DG |
1433 | index_ready: |
1434 | return 1; | |
1435 | } | |
1436 | ||
d3e2ba59 JD |
1437 | /* |
1438 | * Send the next index for a stream. | |
1439 | * | |
1440 | * Return 0 on success or else a negative value. | |
1441 | */ | |
1442 | static | |
58eb9381 | 1443 | int viewer_get_next_index(struct relay_connection *conn) |
d3e2ba59 JD |
1444 | { |
1445 | int ret; | |
1446 | struct lttng_viewer_get_next_index request_index; | |
1447 | struct lttng_viewer_index viewer_index; | |
50adc264 | 1448 | struct ctf_packet_index packet_index; |
7591bab1 MD |
1449 | struct relay_viewer_stream *vstream = NULL; |
1450 | struct relay_stream *rstream = NULL; | |
1451 | struct ctf_trace *ctf_trace = NULL; | |
1452 | struct relay_viewer_stream *metadata_viewer_stream = NULL; | |
d3e2ba59 | 1453 | |
58eb9381 | 1454 | assert(conn); |
d3e2ba59 JD |
1455 | |
1456 | DBG("Viewer get next index"); | |
1457 | ||
7591bab1 | 1458 | memset(&viewer_index, 0, sizeof(viewer_index)); |
eea7556c | 1459 | health_code_update(); |
2f8f53af | 1460 | |
58eb9381 | 1461 | ret = recv_request(conn->sock, &request_index, sizeof(request_index)); |
2f8f53af | 1462 | if (ret < 0) { |
d3e2ba59 JD |
1463 | goto end; |
1464 | } | |
eea7556c | 1465 | health_code_update(); |
d3e2ba59 | 1466 | |
7591bab1 | 1467 | vstream = viewer_stream_get_by_id(be64toh(request_index.stream_id)); |
6763619c | 1468 | if (!vstream) { |
a44ca2ca | 1469 | DBG("Client requested index of unknown stream id %" PRIu64, |
9b9f9f94 | 1470 | (uint64_t) be64toh(request_index.stream_id)); |
f1883937 MD |
1471 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR); |
1472 | goto send_reply; | |
2a174661 DG |
1473 | } |
1474 | ||
7591bab1 MD |
1475 | /* Use back. ref. Protected by refcounts. */ |
1476 | rstream = vstream->stream; | |
1477 | ctf_trace = rstream->trace; | |
d3e2ba59 | 1478 | |
7591bab1 MD |
1479 | /* metadata_viewer_stream may be NULL. */ |
1480 | metadata_viewer_stream = | |
1481 | ctf_trace_get_viewer_metadata_stream(ctf_trace); | |
2a174661 | 1482 | |
7591bab1 | 1483 | pthread_mutex_lock(&rstream->lock); |
d3e2ba59 JD |
1484 | |
1485 | /* | |
1486 | * The viewer should not ask for index on metadata stream. | |
1487 | */ | |
7591bab1 | 1488 | if (rstream->is_metadata) { |
c4e361a4 | 1489 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_HUP); |
d3e2ba59 JD |
1490 | goto send_reply; |
1491 | } | |
1492 | ||
b0d240a2 MD |
1493 | if (rstream->ongoing_rotation.is_set) { |
1494 | /* Rotation is ongoing, try again later. */ | |
1495 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_RETRY); | |
1496 | goto send_reply; | |
1497 | } | |
1498 | ||
1499 | if (rstream->trace->session->ongoing_rotation) { | |
1500 | /* Rotation is ongoing, try again later. */ | |
1501 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_RETRY); | |
1502 | goto send_reply; | |
1503 | } | |
1504 | ||
1505 | if (rstream->trace_chunk) { | |
1506 | uint64_t rchunk_id, vchunk_id; | |
1507 | ||
1508 | /* | |
1509 | * If the relay stream is not yet closed, ensure the viewer | |
1510 | * chunk matches the relay chunk after clear. | |
1511 | */ | |
1512 | if (lttng_trace_chunk_get_id(rstream->trace_chunk, | |
1513 | &rchunk_id) != LTTNG_TRACE_CHUNK_STATUS_OK) { | |
c4e361a4 | 1514 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR); |
b0d240a2 MD |
1515 | goto send_reply; |
1516 | } | |
1517 | if (lttng_trace_chunk_get_id( | |
1518 | conn->viewer_session->current_trace_chunk, | |
1519 | &vchunk_id) != LTTNG_TRACE_CHUNK_STATUS_OK) { | |
1520 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR); | |
1521 | goto send_reply; | |
1522 | } | |
1523 | ||
1524 | if (rchunk_id != vchunk_id) { | |
1525 | DBG("Relay and viewer chunk ids differ: " | |
1526 | "rchunk_id %" PRIu64 " vchunk_id %" PRIu64, | |
1527 | rchunk_id, vchunk_id); | |
1528 | ||
1529 | lttng_trace_chunk_put( | |
1530 | conn->viewer_session->current_trace_chunk); | |
1531 | conn->viewer_session->current_trace_chunk = NULL; | |
1532 | ret = viewer_session_set_trace_chunk_copy( | |
1533 | conn->viewer_session, | |
1534 | rstream->trace_chunk); | |
1535 | if (ret) { | |
1536 | viewer_index.status = | |
1537 | htobe32(LTTNG_VIEWER_INDEX_ERR); | |
1538 | goto send_reply; | |
1539 | } | |
d3e2ba59 | 1540 | } |
b0d240a2 MD |
1541 | } |
1542 | if (conn->viewer_session->current_trace_chunk != | |
1543 | vstream->stream_file.trace_chunk) { | |
1544 | bool acquired_reference; | |
1545 | ||
1546 | DBG("Viewer session and viewer stream chunk differ: " | |
1547 | "vsession chunk %p vstream chunk %p", | |
1548 | conn->viewer_session->current_trace_chunk, | |
1549 | vstream->stream_file.trace_chunk); | |
1550 | lttng_trace_chunk_put(vstream->stream_file.trace_chunk); | |
1551 | acquired_reference = lttng_trace_chunk_get(conn->viewer_session->current_trace_chunk); | |
1552 | assert(acquired_reference); | |
1553 | vstream->stream_file.trace_chunk = | |
1554 | conn->viewer_session->current_trace_chunk; | |
1555 | viewer_stream_sync_tracefile_array_tail(vstream); | |
1556 | viewer_stream_close_files(vstream); | |
d3e2ba59 JD |
1557 | } |
1558 | ||
878c34cf | 1559 | ret = check_index_status(vstream, rstream, ctf_trace, &viewer_index); |
878c34cf | 1560 | if (ret < 0) { |
7591bab1 | 1561 | goto error_put; |
878c34cf DG |
1562 | } else if (ret == 1) { |
1563 | /* | |
7591bab1 MD |
1564 | * We have no index to send and check_index_status has populated |
1565 | * viewer_index's status. | |
878c34cf | 1566 | */ |
d3e2ba59 JD |
1567 | goto send_reply; |
1568 | } | |
7591bab1 | 1569 | /* At this point, ret is 0 thus we will be able to read the index. */ |
878c34cf | 1570 | assert(!ret); |
d3e2ba59 | 1571 | |
b0d240a2 MD |
1572 | /* Try to open an index if one is needed for that stream. */ |
1573 | ret = try_open_index(vstream, rstream); | |
1574 | if (ret == -ENOENT) { | |
1575 | if (rstream->closed) { | |
1576 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_HUP); | |
1577 | goto send_reply; | |
1578 | } else { | |
1579 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_RETRY); | |
1580 | goto send_reply; | |
1581 | } | |
1582 | } | |
1583 | if (ret < 0) { | |
1584 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR); | |
1585 | goto send_reply; | |
1586 | } | |
1587 | ||
7591bab1 MD |
1588 | /* |
1589 | * vstream->stream_fd may be NULL if it has been closed by | |
1590 | * tracefile rotation, or if we are at the beginning of the | |
1591 | * stream. We open the data stream file here to protect against | |
1592 | * overwrite caused by tracefile rotation (in association with | |
1593 | * unlink performed before overwrite). | |
1594 | */ | |
ebb29c10 JG |
1595 | if (!vstream->stream_file.fd) { |
1596 | int fd; | |
1597 | char file_path[LTTNG_PATH_MAX]; | |
1598 | enum lttng_trace_chunk_status status; | |
1599 | ||
1600 | ret = utils_stream_file_path(rstream->path_name, | |
1601 | rstream->channel_name, rstream->tracefile_size, | |
1602 | vstream->current_tracefile_id, NULL, file_path, | |
1603 | sizeof(file_path)); | |
7591bab1 MD |
1604 | if (ret < 0) { |
1605 | goto error_put; | |
1606 | } | |
ebb29c10 | 1607 | |
3ff5c5db MD |
1608 | /* |
1609 | * It is possible the the file we are trying to open is | |
1610 | * missing if the stream has been closed (application exits with | |
1611 | * per-pid buffers) and a clear command has been performed. | |
1612 | */ | |
ebb29c10 JG |
1613 | status = lttng_trace_chunk_open_file( |
1614 | vstream->stream_file.trace_chunk, | |
3ff5c5db | 1615 | file_path, O_RDONLY, 0, &fd, true); |
ebb29c10 | 1616 | if (status != LTTNG_TRACE_CHUNK_STATUS_OK) { |
b0d240a2 MD |
1617 | if (status == LTTNG_TRACE_CHUNK_STATUS_NO_FILE && |
1618 | rstream->closed) { | |
1619 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_HUP); | |
1620 | goto send_reply; | |
1621 | } | |
ebb29c10 | 1622 | PERROR("Failed to open trace file for viewer stream"); |
7591bab1 MD |
1623 | goto error_put; |
1624 | } | |
ebb29c10 JG |
1625 | vstream->stream_file.fd = stream_fd_create(fd); |
1626 | if (!vstream->stream_file.fd) { | |
1627 | if (close(fd)) { | |
1628 | PERROR("Failed to close viewer stream file"); | |
7591bab1 MD |
1629 | } |
1630 | goto error_put; | |
1631 | } | |
d3e2ba59 JD |
1632 | } |
1633 | ||
f04a971b | 1634 | ret = check_new_streams(conn); |
4a9daf17 | 1635 | if (ret < 0) { |
7591bab1 MD |
1636 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR); |
1637 | goto send_reply; | |
4a9daf17 JD |
1638 | } else if (ret == 1) { |
1639 | viewer_index.flags |= LTTNG_VIEWER_FLAG_NEW_STREAM; | |
1640 | } | |
1641 | ||
f8f3885c MD |
1642 | ret = lttng_index_file_read(vstream->index_file, &packet_index); |
1643 | if (ret) { | |
1644 | ERR("Relay error reading index file %d", | |
1645 | vstream->index_file->fd); | |
7591bab1 | 1646 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR); |
6b6b9a5a | 1647 | goto send_reply; |
d3e2ba59 | 1648 | } else { |
c4e361a4 | 1649 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_OK); |
a44ca2ca | 1650 | vstream->index_sent_seqcount++; |
d3e2ba59 JD |
1651 | } |
1652 | ||
1653 | /* | |
1654 | * Indexes are stored in big endian, no need to switch before sending. | |
1655 | */ | |
7591bab1 MD |
1656 | DBG("Sending viewer index for stream %" PRIu64 " offset %" PRIu64, |
1657 | rstream->stream_handle, | |
9b9f9f94 | 1658 | (uint64_t) be64toh(packet_index.offset)); |
d3e2ba59 JD |
1659 | viewer_index.offset = packet_index.offset; |
1660 | viewer_index.packet_size = packet_index.packet_size; | |
1661 | viewer_index.content_size = packet_index.content_size; | |
1662 | viewer_index.timestamp_begin = packet_index.timestamp_begin; | |
1663 | viewer_index.timestamp_end = packet_index.timestamp_end; | |
1664 | viewer_index.events_discarded = packet_index.events_discarded; | |
1665 | viewer_index.stream_id = packet_index.stream_id; | |
1666 | ||
1667 | send_reply: | |
f1883937 MD |
1668 | if (rstream) { |
1669 | pthread_mutex_unlock(&rstream->lock); | |
1670 | } | |
7591bab1 MD |
1671 | |
1672 | if (metadata_viewer_stream) { | |
1673 | pthread_mutex_lock(&metadata_viewer_stream->stream->lock); | |
1674 | DBG("get next index metadata check: recv %" PRIu64 | |
1675 | " sent %" PRIu64, | |
1676 | metadata_viewer_stream->stream->metadata_received, | |
1677 | metadata_viewer_stream->metadata_sent); | |
1678 | if (!metadata_viewer_stream->stream->metadata_received || | |
1679 | metadata_viewer_stream->stream->metadata_received > | |
1680 | metadata_viewer_stream->metadata_sent) { | |
1681 | viewer_index.flags |= LTTNG_VIEWER_FLAG_NEW_METADATA; | |
1682 | } | |
1683 | pthread_mutex_unlock(&metadata_viewer_stream->stream->lock); | |
1684 | } | |
1685 | ||
d3e2ba59 | 1686 | viewer_index.flags = htobe32(viewer_index.flags); |
eea7556c | 1687 | health_code_update(); |
2f8f53af | 1688 | |
58eb9381 | 1689 | ret = send_response(conn->sock, &viewer_index, sizeof(viewer_index)); |
d3e2ba59 | 1690 | if (ret < 0) { |
7591bab1 | 1691 | goto end; |
d3e2ba59 | 1692 | } |
eea7556c | 1693 | health_code_update(); |
d3e2ba59 | 1694 | |
9237e6a1 MD |
1695 | if (vstream) { |
1696 | DBG("Index %" PRIu64 " for stream %" PRIu64 " sent", | |
a44ca2ca | 1697 | vstream->index_sent_seqcount, |
9237e6a1 MD |
1698 | vstream->stream->stream_handle); |
1699 | } | |
d3e2ba59 | 1700 | end: |
7591bab1 MD |
1701 | if (metadata_viewer_stream) { |
1702 | viewer_stream_put(metadata_viewer_stream); | |
1703 | } | |
1704 | if (vstream) { | |
1705 | viewer_stream_put(vstream); | |
1706 | } | |
1707 | return ret; | |
1708 | ||
1709 | error_put: | |
1710 | pthread_mutex_unlock(&rstream->lock); | |
1711 | if (metadata_viewer_stream) { | |
1712 | viewer_stream_put(metadata_viewer_stream); | |
1713 | } | |
1714 | viewer_stream_put(vstream); | |
d3e2ba59 JD |
1715 | return ret; |
1716 | } | |
1717 | ||
1718 | /* | |
1719 | * Send the next index for a stream | |
1720 | * | |
1721 | * Return 0 on success or else a negative value. | |
1722 | */ | |
1723 | static | |
58eb9381 | 1724 | int viewer_get_packet(struct relay_connection *conn) |
d3e2ba59 | 1725 | { |
b6025e94 | 1726 | int ret; |
a5df8828 | 1727 | off_t lseek_ret; |
553b2adb | 1728 | char *reply = NULL; |
d3e2ba59 | 1729 | struct lttng_viewer_get_packet get_packet_info; |
553b2adb | 1730 | struct lttng_viewer_trace_packet reply_header; |
7591bab1 | 1731 | struct relay_viewer_stream *vstream = NULL; |
553b2adb | 1732 | uint32_t reply_size = sizeof(reply_header); |
b6025e94 JR |
1733 | uint32_t packet_data_len = 0; |
1734 | ssize_t read_len; | |
d3e2ba59 JD |
1735 | |
1736 | DBG2("Relay get data packet"); | |
1737 | ||
eea7556c | 1738 | health_code_update(); |
2f8f53af | 1739 | |
7591bab1 MD |
1740 | ret = recv_request(conn->sock, &get_packet_info, |
1741 | sizeof(get_packet_info)); | |
2f8f53af | 1742 | if (ret < 0) { |
d3e2ba59 JD |
1743 | goto end; |
1744 | } | |
eea7556c | 1745 | health_code_update(); |
d3e2ba59 | 1746 | |
0233a6a5 | 1747 | /* From this point on, the error label can be reached. */ |
553b2adb | 1748 | memset(&reply_header, 0, sizeof(reply_header)); |
0233a6a5 | 1749 | |
7591bab1 MD |
1750 | vstream = viewer_stream_get_by_id(be64toh(get_packet_info.stream_id)); |
1751 | if (!vstream) { | |
a44ca2ca | 1752 | DBG("Client requested packet of unknown stream id %" PRIu64, |
9b9f9f94 | 1753 | (uint64_t) be64toh(get_packet_info.stream_id)); |
553b2adb JG |
1754 | reply_header.status = htobe32(LTTNG_VIEWER_GET_PACKET_ERR); |
1755 | goto send_reply_nolock; | |
b6025e94 JR |
1756 | } else { |
1757 | packet_data_len = be32toh(get_packet_info.len); | |
553b2adb | 1758 | reply_size += packet_data_len; |
d3e2ba59 | 1759 | } |
2a174661 | 1760 | |
553b2adb JG |
1761 | reply = zmalloc(reply_size); |
1762 | if (!reply) { | |
1763 | PERROR("packet reply zmalloc"); | |
1764 | reply_size = sizeof(reply_header); | |
d3e2ba59 JD |
1765 | goto error; |
1766 | } | |
1767 | ||
b6025e94 | 1768 | pthread_mutex_lock(&vstream->stream->lock); |
ebb29c10 JG |
1769 | lseek_ret = lseek(vstream->stream_file.fd->fd, |
1770 | be64toh(get_packet_info.offset), SEEK_SET); | |
a5df8828 | 1771 | if (lseek_ret < 0) { |
ebb29c10 JG |
1772 | PERROR("lseek fd %d to offset %" PRIu64, |
1773 | vstream->stream_file.fd->fd, | |
1774 | (uint64_t) be64toh(get_packet_info.offset)); | |
7591bab1 | 1775 | goto error; |
d3e2ba59 | 1776 | } |
ebb29c10 JG |
1777 | read_len = lttng_read(vstream->stream_file.fd->fd, |
1778 | reply + sizeof(reply_header), packet_data_len); | |
b6025e94 | 1779 | if (read_len < packet_data_len) { |
7591bab1 | 1780 | PERROR("Relay reading trace file, fd: %d, offset: %" PRIu64, |
ebb29c10 | 1781 | vstream->stream_file.fd->fd, |
9b9f9f94 | 1782 | (uint64_t) be64toh(get_packet_info.offset)); |
7591bab1 | 1783 | goto error; |
d3e2ba59 | 1784 | } |
553b2adb JG |
1785 | reply_header.status = htobe32(LTTNG_VIEWER_GET_PACKET_OK); |
1786 | reply_header.len = htobe32(packet_data_len); | |
d3e2ba59 JD |
1787 | goto send_reply; |
1788 | ||
1789 | error: | |
553b2adb | 1790 | reply_header.status = htobe32(LTTNG_VIEWER_GET_PACKET_ERR); |
d3e2ba59 JD |
1791 | |
1792 | send_reply: | |
7591bab1 MD |
1793 | if (vstream) { |
1794 | pthread_mutex_unlock(&vstream->stream->lock); | |
1795 | } | |
1796 | send_reply_nolock: | |
eea7556c MD |
1797 | |
1798 | health_code_update(); | |
2f8f53af | 1799 | |
553b2adb JG |
1800 | if (reply) { |
1801 | memcpy(reply, &reply_header, sizeof(reply_header)); | |
1802 | ret = send_response(conn->sock, reply, reply_size); | |
1803 | } else { | |
1804 | /* No reply to send. */ | |
1805 | ret = send_response(conn->sock, &reply_header, | |
1806 | reply_size); | |
1807 | } | |
1808 | ||
b6025e94 | 1809 | health_code_update(); |
d3e2ba59 | 1810 | if (ret < 0) { |
b6025e94 | 1811 | PERROR("sendmsg of packet data failed"); |
7591bab1 | 1812 | goto end_free; |
d3e2ba59 | 1813 | } |
d3e2ba59 | 1814 | |
553b2adb | 1815 | DBG("Sent %u bytes for stream %" PRIu64, reply_size, |
9b9f9f94 | 1816 | (uint64_t) be64toh(get_packet_info.stream_id)); |
d3e2ba59 | 1817 | |
7591bab1 | 1818 | end_free: |
553b2adb | 1819 | free(reply); |
d3e2ba59 | 1820 | end: |
7591bab1 MD |
1821 | if (vstream) { |
1822 | viewer_stream_put(vstream); | |
1823 | } | |
d3e2ba59 JD |
1824 | return ret; |
1825 | } | |
1826 | ||
1827 | /* | |
1828 | * Send the session's metadata | |
1829 | * | |
1830 | * Return 0 on success else a negative value. | |
1831 | */ | |
1832 | static | |
58eb9381 | 1833 | int viewer_get_metadata(struct relay_connection *conn) |
d3e2ba59 JD |
1834 | { |
1835 | int ret = 0; | |
1836 | ssize_t read_len; | |
1837 | uint64_t len = 0; | |
1838 | char *data = NULL; | |
1839 | struct lttng_viewer_get_metadata request; | |
1840 | struct lttng_viewer_metadata_packet reply; | |
7591bab1 | 1841 | struct relay_viewer_stream *vstream = NULL; |
d3e2ba59 | 1842 | |
58eb9381 | 1843 | assert(conn); |
d3e2ba59 JD |
1844 | |
1845 | DBG("Relay get metadata"); | |
1846 | ||
eea7556c | 1847 | health_code_update(); |
2f8f53af | 1848 | |
58eb9381 | 1849 | ret = recv_request(conn->sock, &request, sizeof(request)); |
2f8f53af | 1850 | if (ret < 0) { |
d3e2ba59 JD |
1851 | goto end; |
1852 | } | |
eea7556c | 1853 | health_code_update(); |
d3e2ba59 | 1854 | |
53efb85a MD |
1855 | memset(&reply, 0, sizeof(reply)); |
1856 | ||
7591bab1 MD |
1857 | vstream = viewer_stream_get_by_id(be64toh(request.stream_id)); |
1858 | if (!vstream) { | |
3b463131 MD |
1859 | /* |
1860 | * The metadata stream can be closed by a CLOSE command | |
1861 | * just before we attach. It can also be closed by | |
1862 | * per-pid tracing during tracing. Therefore, it is | |
1863 | * possible that we cannot find this viewer stream. | |
1864 | * Reply back to the client with an error if we cannot | |
1865 | * find it. | |
1866 | */ | |
a44ca2ca | 1867 | DBG("Client requested metadata of unknown stream id %" PRIu64, |
9b9f9f94 | 1868 | (uint64_t) be64toh(request.stream_id)); |
3b463131 | 1869 | reply.status = htobe32(LTTNG_VIEWER_METADATA_ERR); |
7591bab1 | 1870 | goto send_reply; |
d3e2ba59 | 1871 | } |
7591bab1 MD |
1872 | pthread_mutex_lock(&vstream->stream->lock); |
1873 | if (!vstream->stream->is_metadata) { | |
1874 | ERR("Invalid metadata stream"); | |
6763619c JD |
1875 | goto error; |
1876 | } | |
1877 | ||
b0d240a2 | 1878 | if (vstream->metadata_sent >= vstream->stream->metadata_received) { |
94f73d08 MD |
1879 | /* |
1880 | * The live viewers expect to receive a NO_NEW_METADATA | |
1881 | * status before a stream disappears, otherwise they abort the | |
1882 | * entire live connection when receiving an error status. | |
b0d240a2 MD |
1883 | * |
1884 | * Clear feature resets the metadata_sent to 0 until the | |
1885 | * same metadata is received again. | |
94f73d08 | 1886 | */ |
c4e361a4 | 1887 | reply.status = htobe32(LTTNG_VIEWER_NO_NEW_METADATA); |
94f73d08 MD |
1888 | /* |
1889 | * The live viewer considers a closed 0 byte metadata stream as | |
1890 | * an error. | |
1891 | */ | |
1892 | if (vstream->metadata_sent > 0) { | |
1893 | vstream->stream->no_new_metadata_notified = true; | |
1894 | if (vstream->stream->closed) { | |
1895 | /* Release ownership for the viewer metadata stream. */ | |
1896 | viewer_stream_put(vstream); | |
1897 | } | |
1898 | } | |
d3e2ba59 JD |
1899 | goto send_reply; |
1900 | } | |
1901 | ||
b0d240a2 MD |
1902 | len = vstream->stream->metadata_received - vstream->metadata_sent; |
1903 | ||
d3e2ba59 | 1904 | /* first time, we open the metadata file */ |
ebb29c10 JG |
1905 | if (!vstream->stream_file.fd) { |
1906 | int fd; | |
1907 | char file_path[LTTNG_PATH_MAX]; | |
1908 | enum lttng_trace_chunk_status status; | |
1909 | struct relay_stream *rstream = vstream->stream; | |
1910 | ||
1911 | ret = utils_stream_file_path(rstream->path_name, | |
1912 | rstream->channel_name, rstream->tracefile_size, | |
1913 | vstream->current_tracefile_id, NULL, file_path, | |
1914 | sizeof(file_path)); | |
d3e2ba59 JD |
1915 | if (ret < 0) { |
1916 | goto error; | |
1917 | } | |
ebb29c10 | 1918 | |
3ff5c5db MD |
1919 | /* |
1920 | * It is possible the the metadata file we are trying to open is | |
1921 | * missing if the stream has been closed (application exits with | |
1922 | * per-pid buffers) and a clear command has been performed. | |
1923 | */ | |
ebb29c10 JG |
1924 | status = lttng_trace_chunk_open_file( |
1925 | vstream->stream_file.trace_chunk, | |
3ff5c5db | 1926 | file_path, O_RDONLY, 0, &fd, true); |
ebb29c10 | 1927 | if (status != LTTNG_TRACE_CHUNK_STATUS_OK) { |
b0d240a2 MD |
1928 | if (status == LTTNG_TRACE_CHUNK_STATUS_NO_FILE) { |
1929 | reply.status = htobe32(LTTNG_VIEWER_NO_NEW_METADATA); | |
1930 | len = 0; | |
1931 | if (vstream->stream->closed) { | |
1932 | viewer_stream_put(vstream); | |
1933 | } | |
1934 | goto send_reply; | |
1935 | } | |
ebb29c10 | 1936 | PERROR("Failed to open metadata file for viewer stream"); |
d3e2ba59 JD |
1937 | goto error; |
1938 | } | |
ebb29c10 JG |
1939 | vstream->stream_file.fd = stream_fd_create(fd); |
1940 | if (!vstream->stream_file.fd) { | |
1941 | if (close(fd)) { | |
1942 | PERROR("Failed to close viewer metadata file"); | |
7591bab1 MD |
1943 | } |
1944 | goto error; | |
1945 | } | |
d3e2ba59 JD |
1946 | } |
1947 | ||
1948 | reply.len = htobe64(len); | |
1949 | data = zmalloc(len); | |
1950 | if (!data) { | |
1951 | PERROR("viewer metadata zmalloc"); | |
1952 | goto error; | |
1953 | } | |
1954 | ||
ebb29c10 | 1955 | read_len = lttng_read(vstream->stream_file.fd->fd, data, len); |
6cd525e8 | 1956 | if (read_len < len) { |
d3e2ba59 JD |
1957 | PERROR("Relay reading metadata file"); |
1958 | goto error; | |
1959 | } | |
7591bab1 | 1960 | vstream->metadata_sent += read_len; |
c4e361a4 | 1961 | reply.status = htobe32(LTTNG_VIEWER_METADATA_OK); |
7591bab1 | 1962 | |
d3e2ba59 JD |
1963 | goto send_reply; |
1964 | ||
1965 | error: | |
c4e361a4 | 1966 | reply.status = htobe32(LTTNG_VIEWER_METADATA_ERR); |
d3e2ba59 JD |
1967 | |
1968 | send_reply: | |
eea7556c | 1969 | health_code_update(); |
7591bab1 MD |
1970 | if (vstream) { |
1971 | pthread_mutex_unlock(&vstream->stream->lock); | |
1972 | } | |
58eb9381 | 1973 | ret = send_response(conn->sock, &reply, sizeof(reply)); |
d3e2ba59 | 1974 | if (ret < 0) { |
7591bab1 | 1975 | goto end_free; |
d3e2ba59 | 1976 | } |
eea7556c | 1977 | health_code_update(); |
d3e2ba59 JD |
1978 | |
1979 | if (len > 0) { | |
58eb9381 | 1980 | ret = send_response(conn->sock, data, len); |
d3e2ba59 | 1981 | if (ret < 0) { |
7591bab1 | 1982 | goto end_free; |
d3e2ba59 JD |
1983 | } |
1984 | } | |
1985 | ||
1986 | DBG("Sent %" PRIu64 " bytes of metadata for stream %" PRIu64, len, | |
9b9f9f94 | 1987 | (uint64_t) be64toh(request.stream_id)); |
d3e2ba59 JD |
1988 | |
1989 | DBG("Metadata sent"); | |
1990 | ||
7591bab1 | 1991 | end_free: |
d3e2ba59 | 1992 | free(data); |
d3e2ba59 | 1993 | end: |
7591bab1 MD |
1994 | if (vstream) { |
1995 | viewer_stream_put(vstream); | |
1996 | } | |
d3e2ba59 JD |
1997 | return ret; |
1998 | } | |
1999 | ||
c3b7390b JD |
2000 | /* |
2001 | * Create a viewer session. | |
2002 | * | |
2003 | * Return 0 on success or else a negative value. | |
2004 | */ | |
2005 | static | |
2006 | int viewer_create_session(struct relay_connection *conn) | |
2007 | { | |
2008 | int ret; | |
2009 | struct lttng_viewer_create_session_response resp; | |
2010 | ||
2011 | DBG("Viewer create session received"); | |
2012 | ||
53efb85a | 2013 | memset(&resp, 0, sizeof(resp)); |
c3b7390b | 2014 | resp.status = htobe32(LTTNG_VIEWER_CREATE_SESSION_OK); |
7591bab1 | 2015 | conn->viewer_session = viewer_session_create(); |
c3b7390b JD |
2016 | if (!conn->viewer_session) { |
2017 | ERR("Allocation viewer session"); | |
2018 | resp.status = htobe32(LTTNG_VIEWER_CREATE_SESSION_ERR); | |
2019 | goto send_reply; | |
2020 | } | |
c3b7390b JD |
2021 | |
2022 | send_reply: | |
2023 | health_code_update(); | |
2024 | ret = send_response(conn->sock, &resp, sizeof(resp)); | |
2025 | if (ret < 0) { | |
2026 | goto end; | |
2027 | } | |
2028 | health_code_update(); | |
2029 | ret = 0; | |
2030 | ||
2031 | end: | |
2032 | return ret; | |
2033 | } | |
2034 | ||
d62023be JD |
2035 | /* |
2036 | * Detach a viewer session. | |
2037 | * | |
2038 | * Return 0 on success or else a negative value. | |
2039 | */ | |
2040 | static | |
2041 | int viewer_detach_session(struct relay_connection *conn) | |
2042 | { | |
2043 | int ret; | |
2044 | struct lttng_viewer_detach_session_response response; | |
2045 | struct lttng_viewer_detach_session_request request; | |
2046 | struct relay_session *session = NULL; | |
2047 | uint64_t viewer_session_to_close; | |
2048 | ||
2049 | DBG("Viewer detach session received"); | |
2050 | ||
2051 | assert(conn); | |
2052 | ||
2053 | health_code_update(); | |
2054 | ||
2055 | /* Receive the request from the connected client. */ | |
2056 | ret = recv_request(conn->sock, &request, sizeof(request)); | |
2057 | if (ret < 0) { | |
2058 | goto end; | |
2059 | } | |
2060 | viewer_session_to_close = be64toh(request.session_id); | |
2061 | ||
2062 | if (!conn->viewer_session) { | |
2063 | DBG("Client trying to detach before creating a live viewer session"); | |
2064 | response.status = htobe32(LTTNG_VIEWER_DETACH_SESSION_ERR); | |
2065 | goto send_reply; | |
2066 | } | |
2067 | ||
2068 | health_code_update(); | |
2069 | ||
2070 | memset(&response, 0, sizeof(response)); | |
2071 | DBG("Detaching from session ID %" PRIu64, viewer_session_to_close); | |
2072 | ||
2073 | session = session_get_by_id(be64toh(request.session_id)); | |
2074 | if (!session) { | |
2075 | DBG("Relay session %" PRIu64 " not found", | |
9b9f9f94 | 2076 | (uint64_t) be64toh(request.session_id)); |
d62023be JD |
2077 | response.status = htobe32(LTTNG_VIEWER_DETACH_SESSION_UNK); |
2078 | goto send_reply; | |
2079 | } | |
2080 | ||
2081 | ret = viewer_session_is_attached(conn->viewer_session, session); | |
2082 | if (ret != 1) { | |
2083 | DBG("Not attached to this session"); | |
2084 | response.status = htobe32(LTTNG_VIEWER_DETACH_SESSION_ERR); | |
2085 | goto send_reply_put; | |
2086 | } | |
2087 | ||
2088 | viewer_session_close_one_session(conn->viewer_session, session); | |
2089 | response.status = htobe32(LTTNG_VIEWER_DETACH_SESSION_OK); | |
2090 | DBG("Session %" PRIu64 " detached.", viewer_session_to_close); | |
2091 | ||
2092 | send_reply_put: | |
2093 | session_put(session); | |
2094 | ||
2095 | send_reply: | |
2096 | health_code_update(); | |
2097 | ret = send_response(conn->sock, &response, sizeof(response)); | |
2098 | if (ret < 0) { | |
2099 | goto end; | |
2100 | } | |
2101 | health_code_update(); | |
2102 | ret = 0; | |
2103 | ||
2104 | end: | |
2105 | return ret; | |
2106 | } | |
c3b7390b | 2107 | |
d3e2ba59 JD |
2108 | /* |
2109 | * live_relay_unknown_command: send -1 if received unknown command | |
2110 | */ | |
2111 | static | |
58eb9381 | 2112 | void live_relay_unknown_command(struct relay_connection *conn) |
d3e2ba59 JD |
2113 | { |
2114 | struct lttcomm_relayd_generic_reply reply; | |
d3e2ba59 | 2115 | |
53efb85a | 2116 | memset(&reply, 0, sizeof(reply)); |
d3e2ba59 | 2117 | reply.ret_code = htobe32(LTTNG_ERR_UNK); |
58eb9381 | 2118 | (void) send_response(conn->sock, &reply, sizeof(reply)); |
d3e2ba59 JD |
2119 | } |
2120 | ||
2121 | /* | |
2122 | * Process the commands received on the control socket | |
2123 | */ | |
2124 | static | |
2125 | int process_control(struct lttng_viewer_cmd *recv_hdr, | |
58eb9381 | 2126 | struct relay_connection *conn) |
d3e2ba59 JD |
2127 | { |
2128 | int ret = 0; | |
2f8f53af DG |
2129 | uint32_t msg_value; |
2130 | ||
2f8f53af DG |
2131 | msg_value = be32toh(recv_hdr->cmd); |
2132 | ||
2133 | /* | |
2134 | * Make sure we've done the version check before any command other then a | |
2135 | * new client connection. | |
2136 | */ | |
c4e361a4 | 2137 | if (msg_value != LTTNG_VIEWER_CONNECT && !conn->version_check_done) { |
58eb9381 | 2138 | ERR("Viewer conn value %" PRIu32 " before version check", msg_value); |
2f8f53af DG |
2139 | ret = -1; |
2140 | goto end; | |
2141 | } | |
d3e2ba59 | 2142 | |
2f8f53af | 2143 | switch (msg_value) { |
c4e361a4 | 2144 | case LTTNG_VIEWER_CONNECT: |
58eb9381 | 2145 | ret = viewer_connect(conn); |
d3e2ba59 | 2146 | break; |
c4e361a4 | 2147 | case LTTNG_VIEWER_LIST_SESSIONS: |
58eb9381 | 2148 | ret = viewer_list_sessions(conn); |
d3e2ba59 | 2149 | break; |
c4e361a4 | 2150 | case LTTNG_VIEWER_ATTACH_SESSION: |
58eb9381 | 2151 | ret = viewer_attach_session(conn); |
d3e2ba59 | 2152 | break; |
c4e361a4 | 2153 | case LTTNG_VIEWER_GET_NEXT_INDEX: |
58eb9381 | 2154 | ret = viewer_get_next_index(conn); |
d3e2ba59 | 2155 | break; |
c4e361a4 | 2156 | case LTTNG_VIEWER_GET_PACKET: |
58eb9381 | 2157 | ret = viewer_get_packet(conn); |
d3e2ba59 | 2158 | break; |
c4e361a4 | 2159 | case LTTNG_VIEWER_GET_METADATA: |
58eb9381 | 2160 | ret = viewer_get_metadata(conn); |
d3e2ba59 | 2161 | break; |
c4e361a4 | 2162 | case LTTNG_VIEWER_GET_NEW_STREAMS: |
58eb9381 | 2163 | ret = viewer_get_new_streams(conn); |
80e8027a | 2164 | break; |
c3b7390b JD |
2165 | case LTTNG_VIEWER_CREATE_SESSION: |
2166 | ret = viewer_create_session(conn); | |
2167 | break; | |
d62023be JD |
2168 | case LTTNG_VIEWER_DETACH_SESSION: |
2169 | ret = viewer_detach_session(conn); | |
2170 | break; | |
d3e2ba59 | 2171 | default: |
7591bab1 MD |
2172 | ERR("Received unknown viewer command (%u)", |
2173 | be32toh(recv_hdr->cmd)); | |
58eb9381 | 2174 | live_relay_unknown_command(conn); |
d3e2ba59 JD |
2175 | ret = -1; |
2176 | goto end; | |
2177 | } | |
2178 | ||
2179 | end: | |
2180 | return ret; | |
2181 | } | |
2182 | ||
2183 | static | |
58eb9381 | 2184 | void cleanup_connection_pollfd(struct lttng_poll_event *events, int pollfd) |
d3e2ba59 JD |
2185 | { |
2186 | int ret; | |
2187 | ||
58eb9381 | 2188 | (void) lttng_poll_del(events, pollfd); |
d3e2ba59 JD |
2189 | |
2190 | ret = close(pollfd); | |
2191 | if (ret < 0) { | |
2192 | ERR("Closing pollfd %d", pollfd); | |
2193 | } | |
2194 | } | |
2195 | ||
d3e2ba59 JD |
2196 | /* |
2197 | * This thread does the actual work | |
2198 | */ | |
2199 | static | |
2200 | void *thread_worker(void *data) | |
2201 | { | |
2202 | int ret, err = -1; | |
2203 | uint32_t nb_fd; | |
d3e2ba59 | 2204 | struct lttng_poll_event events; |
7591bab1 | 2205 | struct lttng_ht *viewer_connections_ht; |
d3e2ba59 JD |
2206 | struct lttng_ht_iter iter; |
2207 | struct lttng_viewer_cmd recv_hdr; | |
302d8906 | 2208 | struct relay_connection *destroy_conn; |
d3e2ba59 JD |
2209 | |
2210 | DBG("[thread] Live viewer relay worker started"); | |
2211 | ||
2212 | rcu_register_thread(); | |
2213 | ||
eea7556c MD |
2214 | health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_WORKER); |
2215 | ||
9b5e0863 MD |
2216 | if (testpoint(relayd_thread_live_worker)) { |
2217 | goto error_testpoint; | |
2218 | } | |
2219 | ||
d3e2ba59 | 2220 | /* table of connections indexed on socket */ |
7591bab1 MD |
2221 | viewer_connections_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
2222 | if (!viewer_connections_ht) { | |
2223 | goto viewer_connections_ht_error; | |
d3e2ba59 JD |
2224 | } |
2225 | ||
35bc1f58 JG |
2226 | ret = create_named_thread_poll_set(&events, 2, |
2227 | "Live viewer worker thread epoll"); | |
d3e2ba59 JD |
2228 | if (ret < 0) { |
2229 | goto error_poll_create; | |
2230 | } | |
2231 | ||
58eb9381 | 2232 | ret = lttng_poll_add(&events, live_conn_pipe[0], LPOLLIN | LPOLLRDHUP); |
d3e2ba59 JD |
2233 | if (ret < 0) { |
2234 | goto error; | |
2235 | } | |
2236 | ||
2237 | restart: | |
2238 | while (1) { | |
2239 | int i; | |
2240 | ||
eea7556c MD |
2241 | health_code_update(); |
2242 | ||
d3e2ba59 JD |
2243 | /* Infinite blocking call, waiting for transmission */ |
2244 | DBG3("Relayd live viewer worker thread polling..."); | |
eea7556c | 2245 | health_poll_entry(); |
d3e2ba59 | 2246 | ret = lttng_poll_wait(&events, -1); |
eea7556c | 2247 | health_poll_exit(); |
d3e2ba59 JD |
2248 | if (ret < 0) { |
2249 | /* | |
2250 | * Restart interrupted system call. | |
2251 | */ | |
2252 | if (errno == EINTR) { | |
2253 | goto restart; | |
2254 | } | |
2255 | goto error; | |
2256 | } | |
2257 | ||
2258 | nb_fd = ret; | |
2259 | ||
2260 | /* | |
2261 | * Process control. The control connection is prioritised so we don't | |
2262 | * starve it with high throughput tracing data on the data | |
2263 | * connection. | |
2264 | */ | |
2265 | for (i = 0; i < nb_fd; i++) { | |
2266 | /* Fetch once the poll data */ | |
2267 | uint32_t revents = LTTNG_POLL_GETEV(&events, i); | |
2268 | int pollfd = LTTNG_POLL_GETFD(&events, i); | |
2269 | ||
eea7556c MD |
2270 | health_code_update(); |
2271 | ||
d3e2ba59 | 2272 | /* Thread quit pipe has been closed. Killing thread. */ |
bcf4a440 | 2273 | ret = check_thread_quit_pipe(pollfd, revents); |
d3e2ba59 JD |
2274 | if (ret) { |
2275 | err = 0; | |
2276 | goto exit; | |
2277 | } | |
2278 | ||
7591bab1 | 2279 | /* Inspect the relay conn pipe for new connection. */ |
58eb9381 | 2280 | if (pollfd == live_conn_pipe[0]) { |
03e43155 | 2281 | if (revents & LPOLLIN) { |
302d8906 JG |
2282 | struct relay_connection *conn; |
2283 | ||
7591bab1 MD |
2284 | ret = lttng_read(live_conn_pipe[0], |
2285 | &conn, sizeof(conn)); | |
d3e2ba59 JD |
2286 | if (ret < 0) { |
2287 | goto error; | |
2288 | } | |
73039936 FD |
2289 | ret = lttng_poll_add(&events, |
2290 | conn->sock->fd, | |
58eb9381 | 2291 | LPOLLIN | LPOLLRDHUP); |
73039936 FD |
2292 | if (ret) { |
2293 | ERR("Failed to add new live connection file descriptor to poll set"); | |
2294 | goto error; | |
2295 | } | |
7591bab1 MD |
2296 | connection_ht_add(viewer_connections_ht, conn); |
2297 | DBG("Connection socket %d added to poll", conn->sock->fd); | |
03e43155 MD |
2298 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
2299 | ERR("Relay live pipe error"); | |
2300 | goto error; | |
2301 | } else { | |
2302 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
2303 | goto error; | |
d3e2ba59 | 2304 | } |
58eb9381 | 2305 | } else { |
7591bab1 | 2306 | /* Connection activity. */ |
302d8906 JG |
2307 | struct relay_connection *conn; |
2308 | ||
7591bab1 MD |
2309 | conn = connection_get_by_sock(viewer_connections_ht, pollfd); |
2310 | if (!conn) { | |
2311 | continue; | |
2312 | } | |
58eb9381 | 2313 | |
03e43155 | 2314 | if (revents & LPOLLIN) { |
58eb9381 DG |
2315 | ret = conn->sock->ops->recvmsg(conn->sock, &recv_hdr, |
2316 | sizeof(recv_hdr), 0); | |
d3e2ba59 | 2317 | if (ret <= 0) { |
7591bab1 | 2318 | /* Connection closed. */ |
58eb9381 | 2319 | cleanup_connection_pollfd(&events, pollfd); |
7591bab1 MD |
2320 | /* Put "create" ownership reference. */ |
2321 | connection_put(conn); | |
58eb9381 | 2322 | DBG("Viewer control conn closed with %d", pollfd); |
d3e2ba59 | 2323 | } else { |
58eb9381 | 2324 | ret = process_control(&recv_hdr, conn); |
d3e2ba59 JD |
2325 | if (ret < 0) { |
2326 | /* Clear the session on error. */ | |
58eb9381 | 2327 | cleanup_connection_pollfd(&events, pollfd); |
7591bab1 MD |
2328 | /* Put "create" ownership reference. */ |
2329 | connection_put(conn); | |
d3e2ba59 JD |
2330 | DBG("Viewer connection closed with %d", pollfd); |
2331 | } | |
2332 | } | |
03e43155 MD |
2333 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
2334 | cleanup_connection_pollfd(&events, pollfd); | |
2335 | /* Put "create" ownership reference. */ | |
2336 | connection_put(conn); | |
2337 | } else { | |
2338 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
2339 | connection_put(conn); | |
2340 | goto error; | |
d3e2ba59 | 2341 | } |
7591bab1 MD |
2342 | /* Put local "get_by_sock" reference. */ |
2343 | connection_put(conn); | |
d3e2ba59 JD |
2344 | } |
2345 | } | |
2346 | } | |
2347 | ||
2348 | exit: | |
2349 | error: | |
35bc1f58 | 2350 | (void) fd_tracker_util_poll_clean(the_fd_tracker, &events); |
d3e2ba59 | 2351 | |
71efa8ef | 2352 | /* Cleanup remaining connection object. */ |
d3e2ba59 | 2353 | rcu_read_lock(); |
7591bab1 | 2354 | cds_lfht_for_each_entry(viewer_connections_ht->ht, &iter.iter, |
302d8906 | 2355 | destroy_conn, |
58eb9381 | 2356 | sock_n.node) { |
eea7556c | 2357 | health_code_update(); |
7591bab1 | 2358 | connection_put(destroy_conn); |
d3e2ba59 JD |
2359 | } |
2360 | rcu_read_unlock(); | |
2361 | error_poll_create: | |
7591bab1 MD |
2362 | lttng_ht_destroy(viewer_connections_ht); |
2363 | viewer_connections_ht_error: | |
58eb9381 | 2364 | /* Close relay conn pipes */ |
87bcbe91 | 2365 | (void) fd_tracker_util_pipe_close(the_fd_tracker, live_conn_pipe); |
d3e2ba59 JD |
2366 | if (err) { |
2367 | DBG("Viewer worker thread exited with error"); | |
2368 | } | |
2369 | DBG("Viewer worker thread cleanup complete"); | |
9b5e0863 | 2370 | error_testpoint: |
eea7556c MD |
2371 | if (err) { |
2372 | health_error(); | |
2373 | ERR("Health error occurred in %s", __func__); | |
2374 | } | |
2375 | health_unregister(health_relayd); | |
b4aacfdc MD |
2376 | if (lttng_relay_stop_threads()) { |
2377 | ERR("Error stopping threads"); | |
178a0557 | 2378 | } |
d3e2ba59 JD |
2379 | rcu_unregister_thread(); |
2380 | return NULL; | |
2381 | } | |
2382 | ||
2383 | /* | |
2384 | * Create the relay command pipe to wake thread_manage_apps. | |
2385 | * Closed in cleanup(). | |
2386 | */ | |
58eb9381 | 2387 | static int create_conn_pipe(void) |
d3e2ba59 | 2388 | { |
87bcbe91 JG |
2389 | return fd_tracker_util_pipe_open_cloexec(the_fd_tracker, |
2390 | "Live connection pipe", live_conn_pipe); | |
178a0557 | 2391 | } |
d3e2ba59 | 2392 | |
178a0557 | 2393 | int relayd_live_join(void) |
d3e2ba59 | 2394 | { |
178a0557 | 2395 | int ret, retval = 0; |
d3e2ba59 JD |
2396 | void *status; |
2397 | ||
d3e2ba59 | 2398 | ret = pthread_join(live_listener_thread, &status); |
178a0557 MD |
2399 | if (ret) { |
2400 | errno = ret; | |
d3e2ba59 | 2401 | PERROR("pthread_join live listener"); |
178a0557 | 2402 | retval = -1; |
d3e2ba59 JD |
2403 | } |
2404 | ||
2405 | ret = pthread_join(live_worker_thread, &status); | |
178a0557 MD |
2406 | if (ret) { |
2407 | errno = ret; | |
d3e2ba59 | 2408 | PERROR("pthread_join live worker"); |
178a0557 | 2409 | retval = -1; |
d3e2ba59 JD |
2410 | } |
2411 | ||
2412 | ret = pthread_join(live_dispatcher_thread, &status); | |
178a0557 MD |
2413 | if (ret) { |
2414 | errno = ret; | |
d3e2ba59 | 2415 | PERROR("pthread_join live dispatcher"); |
178a0557 | 2416 | retval = -1; |
d3e2ba59 JD |
2417 | } |
2418 | ||
178a0557 | 2419 | cleanup_relayd_live(); |
d3e2ba59 | 2420 | |
178a0557 | 2421 | return retval; |
d3e2ba59 JD |
2422 | } |
2423 | ||
2424 | /* | |
2425 | * main | |
2426 | */ | |
7591bab1 | 2427 | int relayd_live_create(struct lttng_uri *uri) |
d3e2ba59 | 2428 | { |
178a0557 | 2429 | int ret = 0, retval = 0; |
d3e2ba59 JD |
2430 | void *status; |
2431 | int is_root; | |
2432 | ||
178a0557 MD |
2433 | if (!uri) { |
2434 | retval = -1; | |
2435 | goto exit_init_data; | |
2436 | } | |
d3e2ba59 JD |
2437 | live_uri = uri; |
2438 | ||
d3e2ba59 JD |
2439 | /* Check if daemon is UID = 0 */ |
2440 | is_root = !getuid(); | |
2441 | ||
2442 | if (!is_root) { | |
2443 | if (live_uri->port < 1024) { | |
2444 | ERR("Need to be root to use ports < 1024"); | |
178a0557 MD |
2445 | retval = -1; |
2446 | goto exit_init_data; | |
d3e2ba59 JD |
2447 | } |
2448 | } | |
2449 | ||
2450 | /* Setup the thread apps communication pipe. */ | |
178a0557 MD |
2451 | if (create_conn_pipe()) { |
2452 | retval = -1; | |
2453 | goto exit_init_data; | |
d3e2ba59 JD |
2454 | } |
2455 | ||
2456 | /* Init relay command queue. */ | |
8bdee6e2 | 2457 | cds_wfcq_init(&viewer_conn_queue.head, &viewer_conn_queue.tail); |
d3e2ba59 JD |
2458 | |
2459 | /* Set up max poll set size */ | |
25b397f9 MD |
2460 | if (lttng_poll_set_max_size()) { |
2461 | retval = -1; | |
2462 | goto exit_init_data; | |
2463 | } | |
d3e2ba59 JD |
2464 | |
2465 | /* Setup the dispatcher thread */ | |
1a1a34b4 | 2466 | ret = pthread_create(&live_dispatcher_thread, default_pthread_attr(), |
d3e2ba59 | 2467 | thread_dispatcher, (void *) NULL); |
178a0557 MD |
2468 | if (ret) { |
2469 | errno = ret; | |
d3e2ba59 | 2470 | PERROR("pthread_create viewer dispatcher"); |
178a0557 MD |
2471 | retval = -1; |
2472 | goto exit_dispatcher_thread; | |
d3e2ba59 JD |
2473 | } |
2474 | ||
2475 | /* Setup the worker thread */ | |
1a1a34b4 | 2476 | ret = pthread_create(&live_worker_thread, default_pthread_attr(), |
7591bab1 | 2477 | thread_worker, NULL); |
178a0557 MD |
2478 | if (ret) { |
2479 | errno = ret; | |
d3e2ba59 | 2480 | PERROR("pthread_create viewer worker"); |
178a0557 MD |
2481 | retval = -1; |
2482 | goto exit_worker_thread; | |
d3e2ba59 JD |
2483 | } |
2484 | ||
2485 | /* Setup the listener thread */ | |
1a1a34b4 | 2486 | ret = pthread_create(&live_listener_thread, default_pthread_attr(), |
d3e2ba59 | 2487 | thread_listener, (void *) NULL); |
178a0557 MD |
2488 | if (ret) { |
2489 | errno = ret; | |
d3e2ba59 | 2490 | PERROR("pthread_create viewer listener"); |
178a0557 MD |
2491 | retval = -1; |
2492 | goto exit_listener_thread; | |
d3e2ba59 JD |
2493 | } |
2494 | ||
178a0557 MD |
2495 | /* |
2496 | * All OK, started all threads. | |
2497 | */ | |
2498 | return retval; | |
2499 | ||
9911d21b JG |
2500 | /* |
2501 | * Join on the live_listener_thread should anything be added after | |
2502 | * the live_listener thread's creation. | |
2503 | */ | |
d3e2ba59 | 2504 | |
178a0557 | 2505 | exit_listener_thread: |
d3e2ba59 | 2506 | |
d3e2ba59 | 2507 | ret = pthread_join(live_worker_thread, &status); |
178a0557 MD |
2508 | if (ret) { |
2509 | errno = ret; | |
d3e2ba59 | 2510 | PERROR("pthread_join live worker"); |
178a0557 | 2511 | retval = -1; |
d3e2ba59 | 2512 | } |
178a0557 | 2513 | exit_worker_thread: |
d3e2ba59 | 2514 | |
d3e2ba59 | 2515 | ret = pthread_join(live_dispatcher_thread, &status); |
178a0557 MD |
2516 | if (ret) { |
2517 | errno = ret; | |
d3e2ba59 | 2518 | PERROR("pthread_join live dispatcher"); |
178a0557 | 2519 | retval = -1; |
d3e2ba59 | 2520 | } |
178a0557 | 2521 | exit_dispatcher_thread: |
d3e2ba59 | 2522 | |
178a0557 MD |
2523 | exit_init_data: |
2524 | cleanup_relayd_live(); | |
d3e2ba59 | 2525 | |
178a0557 | 2526 | return retval; |
d3e2ba59 | 2527 | } |