Commit | Line | Data |
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d3e2ba59 JD |
1 | /* |
2 | * Copyright (C) 2013 - Julien Desfossez <jdesfossez@efficios.com> | |
3 | * David Goulet <dgoulet@efficios.com> | |
7591bab1 | 4 | * 2015 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
d3e2ba59 JD |
5 | * |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License, version 2 only, | |
8 | * as published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
11 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
12 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
13 | * more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License along | |
16 | * with this program; if not, write to the Free Software Foundation, Inc., | |
17 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 | */ | |
19 | ||
6c1c0768 | 20 | #define _LGPL_SOURCE |
d3e2ba59 JD |
21 | #include <getopt.h> |
22 | #include <grp.h> | |
23 | #include <limits.h> | |
24 | #include <pthread.h> | |
25 | #include <signal.h> | |
26 | #include <stdio.h> | |
27 | #include <stdlib.h> | |
28 | #include <string.h> | |
29 | #include <sys/mman.h> | |
30 | #include <sys/mount.h> | |
31 | #include <sys/resource.h> | |
32 | #include <sys/socket.h> | |
33 | #include <sys/stat.h> | |
34 | #include <sys/types.h> | |
35 | #include <sys/wait.h> | |
36 | #include <inttypes.h> | |
37 | #include <urcu/futex.h> | |
38 | #include <urcu/uatomic.h> | |
7591bab1 | 39 | #include <urcu/rculist.h> |
d3e2ba59 JD |
40 | #include <unistd.h> |
41 | #include <fcntl.h> | |
d3e2ba59 JD |
42 | |
43 | #include <lttng/lttng.h> | |
44 | #include <common/common.h> | |
45 | #include <common/compat/poll.h> | |
46 | #include <common/compat/socket.h> | |
f263b7fd | 47 | #include <common/compat/endian.h> |
d3e2ba59 JD |
48 | #include <common/defaults.h> |
49 | #include <common/futex.h> | |
50 | #include <common/sessiond-comm/sessiond-comm.h> | |
51 | #include <common/sessiond-comm/inet.h> | |
52 | #include <common/sessiond-comm/relayd.h> | |
53 | #include <common/uri.h> | |
54 | #include <common/utils.h> | |
07bc1945 | 55 | #include <common/fd-tracker/utils.h> |
d3e2ba59 JD |
56 | |
57 | #include "cmd.h" | |
58 | #include "live.h" | |
59 | #include "lttng-relayd.h" | |
d3e2ba59 | 60 | #include "utils.h" |
eea7556c | 61 | #include "health-relayd.h" |
9b5e0863 | 62 | #include "testpoint.h" |
2f8f53af | 63 | #include "viewer-stream.h" |
2a174661 DG |
64 | #include "stream.h" |
65 | #include "session.h" | |
66 | #include "ctf-trace.h" | |
58eb9381 | 67 | #include "connection.h" |
7591bab1 | 68 | #include "viewer-session.h" |
f465e978 | 69 | #include "index-file.h" |
7591bab1 MD |
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, | |
201 | struct relay_session *session, unsigned int ignore_sent_flag) | |
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. */ |
7591bab1 | 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 | * | |
275 | * Return 0 on success or else a negative value. | |
276 | */ | |
277 | static | |
278 | int make_viewer_streams(struct relay_session *session, | |
279 | enum lttng_viewer_seek seek_t, uint32_t *nb_total, uint32_t *nb_unsent, | |
bddf80e4 | 280 | uint32_t *nb_created, bool *closed) |
2f8f53af DG |
281 | { |
282 | int ret; | |
2f8f53af | 283 | struct lttng_ht_iter iter; |
2a174661 | 284 | struct ctf_trace *ctf_trace; |
2f8f53af DG |
285 | |
286 | assert(session); | |
287 | ||
288 | /* | |
7591bab1 MD |
289 | * Hold the session lock to ensure that we see either none or |
290 | * all initial streams for a session, but no intermediate state. | |
2f8f53af | 291 | */ |
7591bab1 | 292 | pthread_mutex_lock(&session->lock); |
2f8f53af | 293 | |
bddf80e4 MD |
294 | if (session->connection_closed) { |
295 | *closed = true; | |
296 | } | |
297 | ||
2f8f53af | 298 | /* |
7591bab1 MD |
299 | * Create viewer streams for relay streams that are ready to be |
300 | * used for a the given session id only. | |
2f8f53af | 301 | */ |
2a174661 DG |
302 | rcu_read_lock(); |
303 | cds_lfht_for_each_entry(session->ctf_traces_ht->ht, &iter.iter, ctf_trace, | |
304 | node.node) { | |
305 | struct relay_stream *stream; | |
2f8f53af DG |
306 | |
307 | health_code_update(); | |
308 | ||
7591bab1 | 309 | if (!ctf_trace_get(ctf_trace)) { |
2f8f53af DG |
310 | continue; |
311 | } | |
312 | ||
7591bab1 | 313 | cds_list_for_each_entry_rcu(stream, &ctf_trace->stream_list, stream_node) { |
2a174661 DG |
314 | struct relay_viewer_stream *vstream; |
315 | ||
7591bab1 | 316 | if (!stream_get(stream)) { |
2a174661 DG |
317 | continue; |
318 | } | |
7591bab1 | 319 | /* |
d812ecb9 | 320 | * stream published is protected by the session lock. |
7591bab1 MD |
321 | */ |
322 | if (!stream->published) { | |
323 | goto next; | |
324 | } | |
325 | vstream = viewer_stream_get_by_id(stream->stream_handle); | |
2f8f53af | 326 | if (!vstream) { |
7591bab1 | 327 | vstream = viewer_stream_create(stream, seek_t); |
2a174661 DG |
328 | if (!vstream) { |
329 | ret = -1; | |
7591bab1 MD |
330 | ctf_trace_put(ctf_trace); |
331 | stream_put(stream); | |
2a174661 DG |
332 | goto error_unlock; |
333 | } | |
2a174661 DG |
334 | |
335 | if (nb_created) { | |
336 | /* Update number of created stream counter. */ | |
337 | (*nb_created)++; | |
338 | } | |
2229a09c MD |
339 | /* |
340 | * Ensure a self-reference is preserved even | |
341 | * after we have put our local reference. | |
342 | */ | |
862d3a3b MD |
343 | if (!viewer_stream_get(vstream)) { |
344 | ERR("Unable to get self-reference on viewer stream, logic error."); | |
345 | abort(); | |
346 | } | |
7591bab1 MD |
347 | } else { |
348 | if (!vstream->sent_flag && nb_unsent) { | |
349 | /* Update number of unsent stream counter. */ | |
350 | (*nb_unsent)++; | |
351 | } | |
2f8f53af | 352 | } |
2a174661 DG |
353 | /* Update number of total stream counter. */ |
354 | if (nb_total) { | |
2229a09c MD |
355 | if (stream->is_metadata) { |
356 | if (!stream->closed || | |
357 | stream->metadata_received > vstream->metadata_sent) { | |
358 | (*nb_total)++; | |
359 | } | |
360 | } else { | |
361 | if (!stream->closed || | |
362 | !(((int64_t) (stream->prev_seq - stream->last_net_seq_num)) >= 0)) { | |
363 | ||
364 | (*nb_total)++; | |
365 | } | |
366 | } | |
2f8f53af | 367 | } |
2229a09c MD |
368 | /* Put local reference. */ |
369 | viewer_stream_put(vstream); | |
7591bab1 MD |
370 | next: |
371 | stream_put(stream); | |
2f8f53af | 372 | } |
7591bab1 | 373 | ctf_trace_put(ctf_trace); |
2f8f53af DG |
374 | } |
375 | ||
376 | ret = 0; | |
377 | ||
378 | error_unlock: | |
2a174661 | 379 | rcu_read_unlock(); |
7591bab1 | 380 | pthread_mutex_unlock(&session->lock); |
2f8f53af DG |
381 | return ret; |
382 | } | |
383 | ||
b4aacfdc | 384 | int relayd_live_stop(void) |
d3e2ba59 | 385 | { |
b4aacfdc | 386 | /* Stop dispatch thread */ |
d3e2ba59 | 387 | CMM_STORE_SHARED(live_dispatch_thread_exit, 1); |
58eb9381 | 388 | futex_nto1_wake(&viewer_conn_queue.futex); |
b4aacfdc | 389 | return 0; |
d3e2ba59 JD |
390 | } |
391 | ||
d3e2ba59 JD |
392 | /* |
393 | * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set. | |
394 | */ | |
395 | static | |
17faacb0 JG |
396 | int create_named_thread_poll_set(struct lttng_poll_event *events, |
397 | int size, const char *name) | |
d3e2ba59 JD |
398 | { |
399 | int ret; | |
400 | ||
401 | if (events == NULL || size == 0) { | |
402 | ret = -1; | |
403 | goto error; | |
404 | } | |
405 | ||
17faacb0 JG |
406 | ret = fd_tracker_util_poll_create(the_fd_tracker, |
407 | name, events, 1, LTTNG_CLOEXEC); | |
d3e2ba59 JD |
408 | |
409 | /* Add quit pipe */ | |
bcf4a440 | 410 | ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN | LPOLLERR); |
d3e2ba59 JD |
411 | if (ret < 0) { |
412 | goto error; | |
413 | } | |
414 | ||
415 | return 0; | |
416 | ||
417 | error: | |
418 | return ret; | |
419 | } | |
420 | ||
421 | /* | |
422 | * Check if the thread quit pipe was triggered. | |
423 | * | |
424 | * Return 1 if it was triggered else 0; | |
425 | */ | |
426 | static | |
bcf4a440 | 427 | int check_thread_quit_pipe(int fd, uint32_t events) |
d3e2ba59 | 428 | { |
bcf4a440 | 429 | if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) { |
d3e2ba59 JD |
430 | return 1; |
431 | } | |
432 | ||
433 | return 0; | |
434 | } | |
435 | ||
516c5c51 JG |
436 | static |
437 | int create_sock(void *data, int *out_fd) | |
438 | { | |
439 | int ret; | |
440 | struct lttcomm_sock *sock = data; | |
441 | ||
442 | ret = lttcomm_create_sock(sock); | |
443 | if (ret < 0) { | |
444 | goto end; | |
445 | } | |
446 | ||
447 | *out_fd = sock->fd; | |
448 | end: | |
449 | return ret; | |
450 | } | |
451 | ||
452 | static | |
453 | int close_sock(void *data, int *in_fd) | |
454 | { | |
455 | struct lttcomm_sock *sock = data; | |
456 | ||
457 | return sock->ops->close(sock); | |
458 | } | |
459 | ||
064bcffc JG |
460 | static int accept_sock(void *data, int *out_fd) |
461 | { | |
462 | int ret = 0; | |
463 | /* Socks is an array of in_sock, out_sock. */ | |
464 | struct lttcomm_sock **socks = data; | |
465 | struct lttcomm_sock *in_sock = socks[0]; | |
466 | ||
467 | socks[1] = in_sock->ops->accept(in_sock); | |
468 | if (!socks[1]) { | |
469 | ret = -1; | |
470 | goto end; | |
471 | } | |
472 | *out_fd = socks[1]->fd; | |
473 | end: | |
474 | return ret; | |
475 | } | |
476 | ||
477 | static | |
478 | struct lttcomm_sock *accept_live_sock(struct lttcomm_sock *listening_sock, | |
479 | const char *name) | |
480 | { | |
481 | int out_fd, ret; | |
482 | struct lttcomm_sock *socks[2] = { listening_sock, NULL }; | |
483 | struct lttcomm_sock *new_sock = NULL; | |
484 | ||
485 | ret = fd_tracker_open_unsuspendable_fd( | |
486 | the_fd_tracker, &out_fd, | |
487 | (const char **) &name, | |
488 | 1, accept_sock, &socks); | |
489 | if (ret) { | |
490 | goto end; | |
491 | } | |
492 | new_sock = socks[1]; | |
493 | DBG("%s accepted, socket %d", name, new_sock->fd); | |
494 | end: | |
495 | return new_sock; | |
496 | } | |
497 | ||
d3e2ba59 JD |
498 | /* |
499 | * Create and init socket from uri. | |
500 | */ | |
501 | static | |
516c5c51 | 502 | struct lttcomm_sock *init_socket(struct lttng_uri *uri, const char *name) |
d3e2ba59 | 503 | { |
516c5c51 | 504 | int ret, sock_fd; |
d3e2ba59 | 505 | struct lttcomm_sock *sock = NULL; |
516c5c51 JG |
506 | char uri_str[PATH_MAX]; |
507 | char *formated_name = NULL; | |
d3e2ba59 JD |
508 | |
509 | sock = lttcomm_alloc_sock_from_uri(uri); | |
510 | if (sock == NULL) { | |
511 | ERR("Allocating socket"); | |
512 | goto error; | |
513 | } | |
514 | ||
516c5c51 JG |
515 | /* |
516 | * Don't fail to create the socket if the name can't be built as it is | |
517 | * only used for debugging purposes. | |
518 | */ | |
519 | ret = uri_to_str_url(uri, uri_str, sizeof(uri_str)); | |
520 | uri_str[sizeof(uri_str) - 1] = '\0'; | |
521 | if (ret >= 0) { | |
522 | ret = asprintf(&formated_name, "%s socket @ %s", name, | |
523 | uri_str); | |
524 | if (ret < 0) { | |
525 | formated_name = NULL; | |
526 | } | |
d3e2ba59 | 527 | } |
516c5c51 JG |
528 | |
529 | ret = fd_tracker_open_unsuspendable_fd(the_fd_tracker, &sock_fd, | |
530 | (const char **) (formated_name ? &formated_name : NULL), | |
531 | 1, create_sock, sock); | |
532 | free(formated_name); | |
533 | DBG("Listening on %s socket %d", name, sock->fd); | |
d3e2ba59 JD |
534 | |
535 | ret = sock->ops->bind(sock); | |
536 | if (ret < 0) { | |
537 | goto error; | |
538 | } | |
539 | ||
540 | ret = sock->ops->listen(sock, -1); | |
541 | if (ret < 0) { | |
542 | goto error; | |
543 | ||
544 | } | |
545 | ||
546 | return sock; | |
547 | ||
548 | error: | |
549 | if (sock) { | |
550 | lttcomm_destroy_sock(sock); | |
551 | } | |
552 | return NULL; | |
553 | } | |
554 | ||
555 | /* | |
556 | * This thread manages the listening for new connections on the network | |
557 | */ | |
558 | static | |
559 | void *thread_listener(void *data) | |
560 | { | |
561 | int i, ret, pollfd, err = -1; | |
d3e2ba59 JD |
562 | uint32_t revents, nb_fd; |
563 | struct lttng_poll_event events; | |
564 | struct lttcomm_sock *live_control_sock; | |
565 | ||
566 | DBG("[thread] Relay live listener started"); | |
567 | ||
eea7556c MD |
568 | health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_LISTENER); |
569 | ||
570 | health_code_update(); | |
571 | ||
516c5c51 | 572 | live_control_sock = init_socket(live_uri, "Live listener"); |
d3e2ba59 JD |
573 | if (!live_control_sock) { |
574 | goto error_sock_control; | |
575 | } | |
576 | ||
fb4d42ab | 577 | /* Pass 2 as size here for the thread quit pipe and control sockets. */ |
17faacb0 JG |
578 | ret = create_named_thread_poll_set(&events, 2, |
579 | "Live listener thread epoll"); | |
d3e2ba59 JD |
580 | if (ret < 0) { |
581 | goto error_create_poll; | |
582 | } | |
583 | ||
584 | /* Add the control socket */ | |
585 | ret = lttng_poll_add(&events, live_control_sock->fd, LPOLLIN | LPOLLRDHUP); | |
586 | if (ret < 0) { | |
587 | goto error_poll_add; | |
588 | } | |
589 | ||
3fd27398 MD |
590 | lttng_relay_notify_ready(); |
591 | ||
9b5e0863 MD |
592 | if (testpoint(relayd_thread_live_listener)) { |
593 | goto error_testpoint; | |
594 | } | |
595 | ||
d3e2ba59 | 596 | while (1) { |
eea7556c MD |
597 | health_code_update(); |
598 | ||
d3e2ba59 JD |
599 | DBG("Listener accepting live viewers connections"); |
600 | ||
601 | restart: | |
eea7556c | 602 | health_poll_entry(); |
d3e2ba59 | 603 | ret = lttng_poll_wait(&events, -1); |
eea7556c | 604 | health_poll_exit(); |
d3e2ba59 JD |
605 | if (ret < 0) { |
606 | /* | |
607 | * Restart interrupted system call. | |
608 | */ | |
609 | if (errno == EINTR) { | |
610 | goto restart; | |
611 | } | |
612 | goto error; | |
613 | } | |
614 | nb_fd = ret; | |
615 | ||
616 | DBG("Relay new viewer connection received"); | |
617 | for (i = 0; i < nb_fd; i++) { | |
eea7556c MD |
618 | health_code_update(); |
619 | ||
d3e2ba59 JD |
620 | /* Fetch once the poll data */ |
621 | revents = LTTNG_POLL_GETEV(&events, i); | |
622 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
623 | ||
fd20dac9 MD |
624 | if (!revents) { |
625 | /* No activity for this FD (poll implementation). */ | |
626 | continue; | |
627 | } | |
628 | ||
d3e2ba59 | 629 | /* Thread quit pipe has been closed. Killing thread. */ |
bcf4a440 | 630 | ret = check_thread_quit_pipe(pollfd, revents); |
d3e2ba59 JD |
631 | if (ret) { |
632 | err = 0; | |
633 | goto exit; | |
634 | } | |
635 | ||
03e43155 | 636 | if (revents & LPOLLIN) { |
d3e2ba59 | 637 | /* |
7591bab1 MD |
638 | * A new connection is requested, therefore a |
639 | * viewer connection is allocated in this | |
640 | * thread, enqueued to a global queue and | |
641 | * dequeued (and freed) in the worker thread. | |
d3e2ba59 | 642 | */ |
58eb9381 DG |
643 | int val = 1; |
644 | struct relay_connection *new_conn; | |
d3e2ba59 JD |
645 | struct lttcomm_sock *newsock; |
646 | ||
064bcffc JG |
647 | newsock = accept_live_sock(live_control_sock, |
648 | "Live socket to client"); | |
d3e2ba59 JD |
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: |
17faacb0 | 694 | (void) fd_tracker_util_poll_clean(the_fd_tracker, &events); |
d3e2ba59 JD |
695 | error_create_poll: |
696 | if (live_control_sock->fd >= 0) { | |
516c5c51 JG |
697 | ret = fd_tracker_close_unsuspendable_fd(the_fd_tracker, |
698 | &live_control_sock->fd, 1, close_sock, | |
699 | live_control_sock); | |
d3e2ba59 JD |
700 | if (ret) { |
701 | PERROR("close"); | |
702 | } | |
703 | } | |
704 | lttcomm_destroy_sock(live_control_sock); | |
705 | error_sock_control: | |
706 | if (err) { | |
eea7556c | 707 | health_error(); |
d3e2ba59 JD |
708 | DBG("Live viewer listener thread exited with error"); |
709 | } | |
eea7556c | 710 | health_unregister(health_relayd); |
d3e2ba59 | 711 | DBG("Live viewer listener thread cleanup complete"); |
b4aacfdc MD |
712 | if (lttng_relay_stop_threads()) { |
713 | ERR("Error stopping threads"); | |
178a0557 | 714 | } |
d3e2ba59 JD |
715 | return NULL; |
716 | } | |
717 | ||
718 | /* | |
719 | * This thread manages the dispatching of the requests to worker threads | |
720 | */ | |
721 | static | |
722 | void *thread_dispatcher(void *data) | |
723 | { | |
6cd525e8 MD |
724 | int err = -1; |
725 | ssize_t ret; | |
8bdee6e2 | 726 | struct cds_wfcq_node *node; |
58eb9381 | 727 | struct relay_connection *conn = NULL; |
d3e2ba59 JD |
728 | |
729 | DBG("[thread] Live viewer relay dispatcher started"); | |
730 | ||
eea7556c MD |
731 | health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_DISPATCHER); |
732 | ||
9b5e0863 MD |
733 | if (testpoint(relayd_thread_live_dispatcher)) { |
734 | goto error_testpoint; | |
735 | } | |
736 | ||
eea7556c MD |
737 | health_code_update(); |
738 | ||
68924dc1 | 739 | for (;;) { |
eea7556c MD |
740 | health_code_update(); |
741 | ||
d3e2ba59 | 742 | /* Atomically prepare the queue futex */ |
58eb9381 | 743 | futex_nto1_prepare(&viewer_conn_queue.futex); |
d3e2ba59 | 744 | |
68924dc1 MD |
745 | if (CMM_LOAD_SHARED(live_dispatch_thread_exit)) { |
746 | break; | |
747 | } | |
748 | ||
d3e2ba59 | 749 | do { |
eea7556c MD |
750 | health_code_update(); |
751 | ||
d3e2ba59 | 752 | /* Dequeue commands */ |
8bdee6e2 SM |
753 | node = cds_wfcq_dequeue_blocking(&viewer_conn_queue.head, |
754 | &viewer_conn_queue.tail); | |
d3e2ba59 JD |
755 | if (node == NULL) { |
756 | DBG("Woken up but nothing in the live-viewer " | |
757 | "relay command queue"); | |
758 | /* Continue thread execution */ | |
759 | break; | |
760 | } | |
58eb9381 | 761 | conn = caa_container_of(node, struct relay_connection, qnode); |
d3e2ba59 | 762 | DBG("Dispatching viewer request waiting on sock %d", |
58eb9381 | 763 | conn->sock->fd); |
d3e2ba59 JD |
764 | |
765 | /* | |
7591bab1 MD |
766 | * Inform worker thread of the new request. This |
767 | * call is blocking so we can be assured that | |
768 | * the data will be read at some point in time | |
769 | * or wait to the end of the world :) | |
d3e2ba59 | 770 | */ |
58eb9381 DG |
771 | ret = lttng_write(live_conn_pipe[1], &conn, sizeof(conn)); |
772 | if (ret < 0) { | |
773 | PERROR("write conn pipe"); | |
7591bab1 | 774 | connection_put(conn); |
d3e2ba59 JD |
775 | goto error; |
776 | } | |
777 | } while (node != NULL); | |
778 | ||
779 | /* Futex wait on queue. Blocking call on futex() */ | |
eea7556c | 780 | health_poll_entry(); |
58eb9381 | 781 | futex_nto1_wait(&viewer_conn_queue.futex); |
eea7556c | 782 | health_poll_exit(); |
d3e2ba59 JD |
783 | } |
784 | ||
eea7556c MD |
785 | /* Normal exit, no error */ |
786 | err = 0; | |
787 | ||
d3e2ba59 | 788 | error: |
9b5e0863 | 789 | error_testpoint: |
eea7556c MD |
790 | if (err) { |
791 | health_error(); | |
792 | ERR("Health error occurred in %s", __func__); | |
793 | } | |
794 | health_unregister(health_relayd); | |
d3e2ba59 | 795 | DBG("Live viewer dispatch thread dying"); |
b4aacfdc MD |
796 | if (lttng_relay_stop_threads()) { |
797 | ERR("Error stopping threads"); | |
178a0557 | 798 | } |
d3e2ba59 JD |
799 | return NULL; |
800 | } | |
801 | ||
802 | /* | |
803 | * Establish connection with the viewer and check the versions. | |
804 | * | |
805 | * Return 0 on success or else negative value. | |
806 | */ | |
807 | static | |
58eb9381 | 808 | int viewer_connect(struct relay_connection *conn) |
d3e2ba59 JD |
809 | { |
810 | int ret; | |
811 | struct lttng_viewer_connect reply, msg; | |
812 | ||
58eb9381 | 813 | conn->version_check_done = 1; |
d3e2ba59 | 814 | |
eea7556c MD |
815 | health_code_update(); |
816 | ||
2f8f53af DG |
817 | DBG("Viewer is establishing a connection to the relayd."); |
818 | ||
58eb9381 | 819 | ret = recv_request(conn->sock, &msg, sizeof(msg)); |
2f8f53af | 820 | if (ret < 0) { |
d3e2ba59 JD |
821 | goto end; |
822 | } | |
823 | ||
eea7556c MD |
824 | health_code_update(); |
825 | ||
f46b2ce6 | 826 | memset(&reply, 0, sizeof(reply)); |
d3e2ba59 JD |
827 | reply.major = RELAYD_VERSION_COMM_MAJOR; |
828 | reply.minor = RELAYD_VERSION_COMM_MINOR; | |
829 | ||
830 | /* Major versions must be the same */ | |
831 | if (reply.major != be32toh(msg.major)) { | |
2f8f53af DG |
832 | DBG("Incompatible major versions ([relayd] %u vs [client] %u)", |
833 | reply.major, be32toh(msg.major)); | |
72180669 | 834 | ret = -1; |
d3e2ba59 JD |
835 | goto end; |
836 | } | |
837 | ||
58eb9381 | 838 | conn->major = reply.major; |
d3e2ba59 JD |
839 | /* We adapt to the lowest compatible version */ |
840 | if (reply.minor <= be32toh(msg.minor)) { | |
58eb9381 | 841 | conn->minor = reply.minor; |
d3e2ba59 | 842 | } else { |
58eb9381 | 843 | conn->minor = be32toh(msg.minor); |
d3e2ba59 JD |
844 | } |
845 | ||
c4e361a4 | 846 | if (be32toh(msg.type) == LTTNG_VIEWER_CLIENT_COMMAND) { |
58eb9381 | 847 | conn->type = RELAY_VIEWER_COMMAND; |
c4e361a4 | 848 | } else if (be32toh(msg.type) == LTTNG_VIEWER_CLIENT_NOTIFICATION) { |
58eb9381 | 849 | conn->type = RELAY_VIEWER_NOTIFICATION; |
d3e2ba59 JD |
850 | } else { |
851 | ERR("Unknown connection type : %u", be32toh(msg.type)); | |
852 | ret = -1; | |
853 | goto end; | |
854 | } | |
855 | ||
856 | reply.major = htobe32(reply.major); | |
857 | reply.minor = htobe32(reply.minor); | |
58eb9381 | 858 | if (conn->type == RELAY_VIEWER_COMMAND) { |
93b4787b | 859 | /* |
7591bab1 MD |
860 | * Increment outside of htobe64 macro, because the argument can |
861 | * be used more than once within the macro, and thus the | |
862 | * operation may be undefined. | |
93b4787b | 863 | */ |
7591bab1 | 864 | pthread_mutex_lock(&last_relay_viewer_session_id_lock); |
93b4787b | 865 | last_relay_viewer_session_id++; |
7591bab1 | 866 | pthread_mutex_unlock(&last_relay_viewer_session_id_lock); |
93b4787b | 867 | reply.viewer_session_id = htobe64(last_relay_viewer_session_id); |
d3e2ba59 | 868 | } |
eea7556c MD |
869 | |
870 | health_code_update(); | |
871 | ||
58eb9381 | 872 | ret = send_response(conn->sock, &reply, sizeof(reply)); |
d3e2ba59 | 873 | if (ret < 0) { |
2f8f53af | 874 | goto end; |
d3e2ba59 JD |
875 | } |
876 | ||
eea7556c MD |
877 | health_code_update(); |
878 | ||
58eb9381 | 879 | DBG("Version check done using protocol %u.%u", conn->major, conn->minor); |
d3e2ba59 JD |
880 | ret = 0; |
881 | ||
882 | end: | |
883 | return ret; | |
884 | } | |
885 | ||
886 | /* | |
887 | * Send the viewer the list of current sessions. | |
7591bab1 MD |
888 | * We need to create a copy of the hash table content because otherwise |
889 | * we cannot assume the number of entries stays the same between getting | |
890 | * the number of HT elements and iteration over the HT. | |
d3e2ba59 JD |
891 | * |
892 | * Return 0 on success or else a negative value. | |
893 | */ | |
894 | static | |
58eb9381 | 895 | int viewer_list_sessions(struct relay_connection *conn) |
d3e2ba59 | 896 | { |
5f10c6b1 | 897 | int ret = 0; |
d3e2ba59 | 898 | struct lttng_viewer_list_sessions session_list; |
d3e2ba59 | 899 | struct lttng_ht_iter iter; |
d3e2ba59 | 900 | struct relay_session *session; |
7591bab1 MD |
901 | struct lttng_viewer_session *send_session_buf = NULL; |
902 | uint32_t buf_count = SESSION_BUF_DEFAULT_COUNT; | |
903 | uint32_t count = 0; | |
d3e2ba59 JD |
904 | |
905 | DBG("List sessions received"); | |
906 | ||
7591bab1 MD |
907 | send_session_buf = zmalloc(SESSION_BUF_DEFAULT_COUNT * sizeof(*send_session_buf)); |
908 | if (!send_session_buf) { | |
909 | return -1; | |
d3e2ba59 JD |
910 | } |
911 | ||
7591bab1 MD |
912 | rcu_read_lock(); |
913 | cds_lfht_for_each_entry(sessions_ht->ht, &iter.iter, session, | |
2f8f53af | 914 | session_n.node) { |
7591bab1 | 915 | struct lttng_viewer_session *send_session; |
d3e2ba59 | 916 | |
eea7556c MD |
917 | health_code_update(); |
918 | ||
4213c227 JR |
919 | if (session->connection_closed) { |
920 | /* Skip closed session */ | |
921 | continue; | |
922 | } | |
923 | ||
7591bab1 MD |
924 | if (count >= buf_count) { |
925 | struct lttng_viewer_session *newbuf; | |
926 | uint32_t new_buf_count = buf_count << 1; | |
eea7556c | 927 | |
7591bab1 MD |
928 | newbuf = realloc(send_session_buf, |
929 | new_buf_count * sizeof(*send_session_buf)); | |
930 | if (!newbuf) { | |
931 | ret = -1; | |
5f10c6b1 | 932 | break; |
7591bab1 MD |
933 | } |
934 | send_session_buf = newbuf; | |
935 | buf_count = new_buf_count; | |
6763619c | 936 | } |
7591bab1 | 937 | send_session = &send_session_buf[count]; |
bfc3fb17 MD |
938 | if (lttng_strncpy(send_session->session_name, |
939 | session->session_name, | |
940 | sizeof(send_session->session_name))) { | |
941 | ret = -1; | |
5f10c6b1 | 942 | break; |
bfc3fb17 MD |
943 | } |
944 | if (lttng_strncpy(send_session->hostname, session->hostname, | |
945 | sizeof(send_session->hostname))) { | |
946 | ret = -1; | |
5f10c6b1 | 947 | break; |
bfc3fb17 | 948 | } |
7591bab1 MD |
949 | send_session->id = htobe64(session->id); |
950 | send_session->live_timer = htobe32(session->live_timer); | |
951 | if (session->viewer_attached) { | |
952 | send_session->clients = htobe32(1); | |
953 | } else { | |
954 | send_session->clients = htobe32(0); | |
d227d5bd | 955 | } |
7591bab1 MD |
956 | send_session->streams = htobe32(session->stream_count); |
957 | count++; | |
958 | } | |
959 | rcu_read_unlock(); | |
5f10c6b1 JG |
960 | if (ret < 0) { |
961 | goto end_free; | |
962 | } | |
d227d5bd | 963 | |
7591bab1 | 964 | session_list.sessions_count = htobe32(count); |
d227d5bd | 965 | |
7591bab1 | 966 | health_code_update(); |
d227d5bd | 967 | |
7591bab1 MD |
968 | ret = send_response(conn->sock, &session_list, sizeof(session_list)); |
969 | if (ret < 0) { | |
970 | goto end_free; | |
d227d5bd | 971 | } |
d227d5bd | 972 | |
7591bab1 | 973 | health_code_update(); |
d227d5bd | 974 | |
7591bab1 MD |
975 | ret = send_response(conn->sock, send_session_buf, |
976 | count * sizeof(*send_session_buf)); | |
977 | if (ret < 0) { | |
978 | goto end_free; | |
d227d5bd | 979 | } |
7591bab1 | 980 | health_code_update(); |
d227d5bd | 981 | |
7591bab1 MD |
982 | ret = 0; |
983 | end_free: | |
984 | free(send_session_buf); | |
985 | return ret; | |
d227d5bd JD |
986 | } |
987 | ||
80e8027a | 988 | /* |
7591bab1 | 989 | * Send the viewer the list of current streams. |
80e8027a JD |
990 | */ |
991 | static | |
58eb9381 | 992 | int viewer_get_new_streams(struct relay_connection *conn) |
80e8027a JD |
993 | { |
994 | int ret, send_streams = 0; | |
7591bab1 | 995 | uint32_t nb_created = 0, nb_unsent = 0, nb_streams = 0, nb_total = 0; |
80e8027a JD |
996 | struct lttng_viewer_new_streams_request request; |
997 | struct lttng_viewer_new_streams_response response; | |
80e8027a | 998 | struct relay_session *session; |
6763619c | 999 | uint64_t session_id; |
bddf80e4 | 1000 | bool closed = false; |
80e8027a | 1001 | |
58eb9381 | 1002 | assert(conn); |
80e8027a JD |
1003 | |
1004 | DBG("Get new streams received"); | |
1005 | ||
80e8027a JD |
1006 | health_code_update(); |
1007 | ||
2f8f53af | 1008 | /* Receive the request from the connected client. */ |
58eb9381 | 1009 | ret = recv_request(conn->sock, &request, sizeof(request)); |
2f8f53af | 1010 | if (ret < 0) { |
80e8027a JD |
1011 | goto error; |
1012 | } | |
6763619c | 1013 | session_id = be64toh(request.session_id); |
80e8027a JD |
1014 | |
1015 | health_code_update(); | |
1016 | ||
53efb85a MD |
1017 | memset(&response, 0, sizeof(response)); |
1018 | ||
7591bab1 | 1019 | session = session_get_by_id(session_id); |
2f8f53af | 1020 | if (!session) { |
6763619c | 1021 | DBG("Relay session %" PRIu64 " not found", session_id); |
c4e361a4 | 1022 | response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_ERR); |
80e8027a JD |
1023 | goto send_reply; |
1024 | } | |
1025 | ||
7591bab1 | 1026 | if (!viewer_session_is_attached(conn->viewer_session, session)) { |
80e8027a | 1027 | send_streams = 0; |
c4e361a4 | 1028 | response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_ERR); |
80e8027a JD |
1029 | goto send_reply; |
1030 | } | |
1031 | ||
6763619c JD |
1032 | send_streams = 1; |
1033 | response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_OK); | |
1034 | ||
7591bab1 | 1035 | ret = make_viewer_streams(session, LTTNG_VIEWER_SEEK_LAST, &nb_total, &nb_unsent, |
bddf80e4 | 1036 | &nb_created, &closed); |
2f8f53af | 1037 | if (ret < 0) { |
7591bab1 | 1038 | goto end_put_session; |
2f8f53af DG |
1039 | } |
1040 | /* Only send back the newly created streams with the unsent ones. */ | |
1041 | nb_streams = nb_created + nb_unsent; | |
80e8027a JD |
1042 | response.streams_count = htobe32(nb_streams); |
1043 | ||
4479f682 | 1044 | /* |
2229a09c MD |
1045 | * If the session is closed, HUP when there are no more streams |
1046 | * with data. | |
4479f682 | 1047 | */ |
bddf80e4 | 1048 | if (closed && nb_total == 0) { |
4479f682 | 1049 | send_streams = 0; |
bddf80e4 | 1050 | response.streams_count = 0; |
4479f682 JD |
1051 | response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_HUP); |
1052 | goto send_reply; | |
1053 | } | |
1054 | ||
80e8027a JD |
1055 | send_reply: |
1056 | health_code_update(); | |
58eb9381 | 1057 | ret = send_response(conn->sock, &response, sizeof(response)); |
80e8027a | 1058 | if (ret < 0) { |
7591bab1 | 1059 | goto end_put_session; |
80e8027a JD |
1060 | } |
1061 | health_code_update(); | |
1062 | ||
1063 | /* | |
7591bab1 MD |
1064 | * Unknown or empty session, just return gracefully, the viewer |
1065 | * knows what is happening. | |
80e8027a JD |
1066 | */ |
1067 | if (!send_streams || !nb_streams) { | |
1068 | ret = 0; | |
7591bab1 | 1069 | goto end_put_session; |
80e8027a JD |
1070 | } |
1071 | ||
2f8f53af | 1072 | /* |
7591bab1 MD |
1073 | * Send stream and *DON'T* ignore the sent flag so every viewer |
1074 | * streams that were not sent from that point will be sent to | |
1075 | * the viewer. | |
2f8f53af | 1076 | */ |
58eb9381 | 1077 | ret = send_viewer_streams(conn->sock, session, 0); |
2f8f53af | 1078 | if (ret < 0) { |
7591bab1 | 1079 | goto end_put_session; |
80e8027a JD |
1080 | } |
1081 | ||
7591bab1 MD |
1082 | end_put_session: |
1083 | if (session) { | |
1084 | session_put(session); | |
1085 | } | |
80e8027a JD |
1086 | error: |
1087 | return ret; | |
1088 | } | |
1089 | ||
d3e2ba59 JD |
1090 | /* |
1091 | * Send the viewer the list of current sessions. | |
1092 | */ | |
1093 | static | |
58eb9381 | 1094 | int viewer_attach_session(struct relay_connection *conn) |
d3e2ba59 | 1095 | { |
2f8f53af DG |
1096 | int send_streams = 0; |
1097 | ssize_t ret; | |
80e8027a | 1098 | uint32_t nb_streams = 0; |
2f8f53af | 1099 | enum lttng_viewer_seek seek_type; |
d3e2ba59 JD |
1100 | struct lttng_viewer_attach_session_request request; |
1101 | struct lttng_viewer_attach_session_response response; | |
7591bab1 | 1102 | struct relay_session *session = NULL; |
bddf80e4 | 1103 | bool closed = false; |
d3e2ba59 | 1104 | |
58eb9381 | 1105 | assert(conn); |
d3e2ba59 | 1106 | |
eea7556c MD |
1107 | health_code_update(); |
1108 | ||
2f8f53af | 1109 | /* Receive the request from the connected client. */ |
58eb9381 | 1110 | ret = recv_request(conn->sock, &request, sizeof(request)); |
2f8f53af | 1111 | if (ret < 0) { |
d3e2ba59 JD |
1112 | goto error; |
1113 | } | |
1114 | ||
eea7556c MD |
1115 | health_code_update(); |
1116 | ||
53efb85a MD |
1117 | memset(&response, 0, sizeof(response)); |
1118 | ||
c3b7390b JD |
1119 | if (!conn->viewer_session) { |
1120 | DBG("Client trying to attach before creating a live viewer session"); | |
1121 | response.status = htobe32(LTTNG_VIEWER_ATTACH_NO_SESSION); | |
1122 | goto send_reply; | |
1123 | } | |
1124 | ||
7591bab1 | 1125 | session = session_get_by_id(be64toh(request.session_id)); |
2f8f53af | 1126 | if (!session) { |
d3e2ba59 | 1127 | DBG("Relay session %" PRIu64 " not found", |
f8fc08d2 | 1128 | (uint64_t) be64toh(request.session_id)); |
c4e361a4 | 1129 | response.status = htobe32(LTTNG_VIEWER_ATTACH_UNK); |
d3e2ba59 JD |
1130 | goto send_reply; |
1131 | } | |
7591bab1 | 1132 | DBG("Attach session ID %" PRIu64 " received", |
f8fc08d2 | 1133 | (uint64_t) be64toh(request.session_id)); |
d3e2ba59 | 1134 | |
7591bab1 | 1135 | if (session->live_timer == 0) { |
d3e2ba59 | 1136 | DBG("Not live session"); |
c4e361a4 | 1137 | response.status = htobe32(LTTNG_VIEWER_ATTACH_NOT_LIVE); |
d3e2ba59 | 1138 | goto send_reply; |
7591bab1 MD |
1139 | } |
1140 | ||
1141 | send_streams = 1; | |
1142 | ret = viewer_session_attach(conn->viewer_session, session); | |
1143 | if (ret) { | |
1144 | DBG("Already a viewer attached"); | |
1145 | response.status = htobe32(LTTNG_VIEWER_ATTACH_ALREADY); | |
1146 | goto send_reply; | |
d3e2ba59 JD |
1147 | } |
1148 | ||
1149 | switch (be32toh(request.seek)) { | |
c4e361a4 JD |
1150 | case LTTNG_VIEWER_SEEK_BEGINNING: |
1151 | case LTTNG_VIEWER_SEEK_LAST: | |
7591bab1 | 1152 | response.status = htobe32(LTTNG_VIEWER_ATTACH_OK); |
2f8f53af | 1153 | seek_type = be32toh(request.seek); |
d3e2ba59 JD |
1154 | break; |
1155 | default: | |
1156 | ERR("Wrong seek parameter"); | |
c4e361a4 | 1157 | response.status = htobe32(LTTNG_VIEWER_ATTACH_SEEK_ERR); |
d3e2ba59 JD |
1158 | send_streams = 0; |
1159 | goto send_reply; | |
1160 | } | |
1161 | ||
bddf80e4 MD |
1162 | ret = make_viewer_streams(session, seek_type, &nb_streams, NULL, |
1163 | NULL, &closed); | |
2f8f53af | 1164 | if (ret < 0) { |
7591bab1 | 1165 | goto end_put_session; |
d3e2ba59 | 1166 | } |
2f8f53af | 1167 | response.streams_count = htobe32(nb_streams); |
d3e2ba59 | 1168 | |
bddf80e4 MD |
1169 | /* |
1170 | * If the session is closed when the viewer is attaching, it | |
1171 | * means some of the streams may have been concurrently removed, | |
1172 | * so we don't allow the viewer to attach, even if there are | |
1173 | * streams available. | |
1174 | */ | |
1175 | if (closed) { | |
1176 | send_streams = 0; | |
1177 | response.streams_count = 0; | |
7c4de72f | 1178 | response.status = htobe32(LTTNG_VIEWER_ATTACH_UNK); |
bddf80e4 MD |
1179 | goto send_reply; |
1180 | } | |
1181 | ||
d3e2ba59 | 1182 | send_reply: |
eea7556c | 1183 | health_code_update(); |
58eb9381 | 1184 | ret = send_response(conn->sock, &response, sizeof(response)); |
d3e2ba59 | 1185 | if (ret < 0) { |
7591bab1 | 1186 | goto end_put_session; |
d3e2ba59 | 1187 | } |
eea7556c | 1188 | health_code_update(); |
d3e2ba59 JD |
1189 | |
1190 | /* | |
7591bab1 MD |
1191 | * Unknown or empty session, just return gracefully, the viewer |
1192 | * knows what is happening. | |
d3e2ba59 | 1193 | */ |
157df586 | 1194 | if (!send_streams || !nb_streams) { |
d3e2ba59 | 1195 | ret = 0; |
7591bab1 | 1196 | goto end_put_session; |
d3e2ba59 JD |
1197 | } |
1198 | ||
2f8f53af | 1199 | /* Send stream and ignore the sent flag. */ |
58eb9381 | 1200 | ret = send_viewer_streams(conn->sock, session, 1); |
2f8f53af | 1201 | if (ret < 0) { |
7591bab1 | 1202 | goto end_put_session; |
d3e2ba59 | 1203 | } |
d3e2ba59 | 1204 | |
7591bab1 MD |
1205 | end_put_session: |
1206 | if (session) { | |
1207 | session_put(session); | |
1208 | } | |
4a9daf17 JD |
1209 | error: |
1210 | return ret; | |
1211 | } | |
1212 | ||
878c34cf DG |
1213 | /* |
1214 | * Open the index file if needed for the given vstream. | |
1215 | * | |
e0547b83 MD |
1216 | * If an index file is successfully opened, the vstream will set it as its |
1217 | * current index file. | |
878c34cf DG |
1218 | * |
1219 | * Return 0 on success, a negative value on error (-ENOENT if not ready yet). | |
7591bab1 MD |
1220 | * |
1221 | * Called with rstream lock held. | |
878c34cf DG |
1222 | */ |
1223 | static int try_open_index(struct relay_viewer_stream *vstream, | |
1224 | struct relay_stream *rstream) | |
1225 | { | |
1226 | int ret = 0; | |
1227 | ||
e0547b83 | 1228 | if (vstream->index_file) { |
878c34cf DG |
1229 | goto end; |
1230 | } | |
1231 | ||
1232 | /* | |
7591bab1 | 1233 | * First time, we open the index file and at least one index is ready. |
878c34cf | 1234 | */ |
a44ca2ca | 1235 | if (rstream->index_received_seqcount == 0) { |
878c34cf DG |
1236 | ret = -ENOENT; |
1237 | goto end; | |
1238 | } | |
f465e978 | 1239 | vstream->index_file = relay_index_file_open(vstream->path_name, |
e0547b83 | 1240 | vstream->channel_name, |
7591bab1 MD |
1241 | vstream->stream->tracefile_count, |
1242 | vstream->current_tracefile_id); | |
e0547b83 MD |
1243 | if (!vstream->index_file) { |
1244 | ret = -1; | |
878c34cf DG |
1245 | } |
1246 | ||
1247 | end: | |
1248 | return ret; | |
1249 | } | |
1250 | ||
1251 | /* | |
7591bab1 MD |
1252 | * Check the status of the index for the given stream. This function |
1253 | * updates the index structure if needed and can put (close) the vstream | |
1254 | * in the HUP situation. | |
1255 | * | |
1256 | * Return 0 means that we can proceed with the index. A value of 1 means | |
1257 | * that the index has been updated and is ready to be sent to the | |
1258 | * client. A negative value indicates an error that can't be handled. | |
878c34cf | 1259 | * |
7591bab1 | 1260 | * Called with rstream lock held. |
878c34cf DG |
1261 | */ |
1262 | static int check_index_status(struct relay_viewer_stream *vstream, | |
1263 | struct relay_stream *rstream, struct ctf_trace *trace, | |
1264 | struct lttng_viewer_index *index) | |
1265 | { | |
1266 | int ret; | |
1267 | ||
7591bab1 | 1268 | if (trace->session->connection_closed |
a44ca2ca MD |
1269 | && rstream->index_received_seqcount |
1270 | == vstream->index_sent_seqcount) { | |
7591bab1 MD |
1271 | /* Last index sent and session connection is closed. */ |
1272 | index->status = htobe32(LTTNG_VIEWER_INDEX_HUP); | |
1273 | goto hup; | |
1274 | } else if (rstream->beacon_ts_end != -1ULL && | |
a44ca2ca MD |
1275 | rstream->index_received_seqcount |
1276 | == vstream->index_sent_seqcount) { | |
7591bab1 MD |
1277 | /* |
1278 | * We've received a synchronization beacon and the last index | |
1279 | * available has been sent, the index for now is inactive. | |
1280 | * | |
1281 | * In this case, we have received a beacon which allows us to | |
1282 | * inform the client of a time interval during which we can | |
1283 | * guarantee that there are no events to read (and never will | |
1284 | * be). | |
1285 | */ | |
1286 | index->status = htobe32(LTTNG_VIEWER_INDEX_INACTIVE); | |
1287 | index->timestamp_end = htobe64(rstream->beacon_ts_end); | |
1288 | index->stream_id = htobe64(rstream->ctf_stream_id); | |
1289 | goto index_ready; | |
a44ca2ca MD |
1290 | } else if (rstream->index_received_seqcount |
1291 | == vstream->index_sent_seqcount) { | |
7591bab1 | 1292 | /* |
a44ca2ca MD |
1293 | * This checks whether received == sent seqcount. In |
1294 | * this case, we have not received a beacon. Therefore, | |
1295 | * we can only ask the client to retry later. | |
7591bab1 MD |
1296 | */ |
1297 | index->status = htobe32(LTTNG_VIEWER_INDEX_RETRY); | |
1298 | goto index_ready; | |
a44ca2ca MD |
1299 | } else if (!tracefile_array_seq_in_file(rstream->tfa, |
1300 | vstream->current_tracefile_id, | |
1301 | vstream->index_sent_seqcount)) { | |
7591bab1 | 1302 | /* |
a44ca2ca MD |
1303 | * The next index we want to send cannot be read either |
1304 | * because we need to perform a rotation, or due to | |
1305 | * the producer having overwritten its trace file. | |
7591bab1 | 1306 | */ |
a44ca2ca | 1307 | DBG("Viewer stream %" PRIu64 " rotation", |
7591bab1 MD |
1308 | vstream->stream->stream_handle); |
1309 | ret = viewer_stream_rotate(vstream); | |
1310 | if (ret < 0) { | |
1311 | goto end; | |
1312 | } else if (ret == 1) { | |
1313 | /* EOF across entire stream. */ | |
1314 | index->status = htobe32(LTTNG_VIEWER_INDEX_HUP); | |
1315 | goto hup; | |
1316 | } | |
7591bab1 | 1317 | /* |
a44ca2ca MD |
1318 | * If we have been pushed due to overwrite, it |
1319 | * necessarily means there is data that can be read in | |
1320 | * the stream. If we rotated because we reached the end | |
1321 | * of a tracefile, it means the following tracefile | |
1322 | * needs to contain at least one index, else we would | |
1323 | * have already returned LTTNG_VIEWER_INDEX_RETRY to the | |
1324 | * viewer. The updated index_sent_seqcount needs to | |
1325 | * point to a readable index entry now. | |
1326 | * | |
1327 | * In the case where we "rotate" on a single file, we | |
1328 | * can end up in a case where the requested index is | |
1329 | * still unavailable. | |
7591bab1 | 1330 | */ |
a44ca2ca MD |
1331 | if (rstream->tracefile_count == 1 && |
1332 | !tracefile_array_seq_in_file( | |
1333 | rstream->tfa, | |
1334 | vstream->current_tracefile_id, | |
1335 | vstream->index_sent_seqcount)) { | |
1336 | index->status = htobe32(LTTNG_VIEWER_INDEX_RETRY); | |
1337 | goto index_ready; | |
878c34cf | 1338 | } |
a44ca2ca MD |
1339 | assert(tracefile_array_seq_in_file(rstream->tfa, |
1340 | vstream->current_tracefile_id, | |
1341 | vstream->index_sent_seqcount)); | |
878c34cf | 1342 | } |
a44ca2ca MD |
1343 | /* ret == 0 means successful so we continue. */ |
1344 | ret = 0; | |
7591bab1 | 1345 | end: |
878c34cf DG |
1346 | return ret; |
1347 | ||
1348 | hup: | |
7591bab1 | 1349 | viewer_stream_put(vstream); |
878c34cf DG |
1350 | index_ready: |
1351 | return 1; | |
1352 | } | |
1353 | ||
d3e2ba59 JD |
1354 | /* |
1355 | * Send the next index for a stream. | |
1356 | * | |
1357 | * Return 0 on success or else a negative value. | |
1358 | */ | |
1359 | static | |
58eb9381 | 1360 | int viewer_get_next_index(struct relay_connection *conn) |
d3e2ba59 JD |
1361 | { |
1362 | int ret; | |
1363 | struct lttng_viewer_get_next_index request_index; | |
1364 | struct lttng_viewer_index viewer_index; | |
50adc264 | 1365 | struct ctf_packet_index packet_index; |
7591bab1 MD |
1366 | struct relay_viewer_stream *vstream = NULL; |
1367 | struct relay_stream *rstream = NULL; | |
1368 | struct ctf_trace *ctf_trace = NULL; | |
1369 | struct relay_viewer_stream *metadata_viewer_stream = NULL; | |
d3e2ba59 | 1370 | |
58eb9381 | 1371 | assert(conn); |
d3e2ba59 JD |
1372 | |
1373 | DBG("Viewer get next index"); | |
1374 | ||
7591bab1 | 1375 | memset(&viewer_index, 0, sizeof(viewer_index)); |
eea7556c | 1376 | health_code_update(); |
2f8f53af | 1377 | |
58eb9381 | 1378 | ret = recv_request(conn->sock, &request_index, sizeof(request_index)); |
2f8f53af | 1379 | if (ret < 0) { |
d3e2ba59 JD |
1380 | goto end; |
1381 | } | |
eea7556c | 1382 | health_code_update(); |
d3e2ba59 | 1383 | |
7591bab1 | 1384 | vstream = viewer_stream_get_by_id(be64toh(request_index.stream_id)); |
6763619c | 1385 | if (!vstream) { |
a44ca2ca | 1386 | DBG("Client requested index of unknown stream id %" PRIu64, |
f8fc08d2 | 1387 | (uint64_t) be64toh(request_index.stream_id)); |
f1883937 MD |
1388 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR); |
1389 | goto send_reply; | |
2a174661 DG |
1390 | } |
1391 | ||
7591bab1 MD |
1392 | /* Use back. ref. Protected by refcounts. */ |
1393 | rstream = vstream->stream; | |
1394 | ctf_trace = rstream->trace; | |
d3e2ba59 | 1395 | |
7591bab1 MD |
1396 | /* metadata_viewer_stream may be NULL. */ |
1397 | metadata_viewer_stream = | |
1398 | ctf_trace_get_viewer_metadata_stream(ctf_trace); | |
2a174661 | 1399 | |
7591bab1 | 1400 | pthread_mutex_lock(&rstream->lock); |
d3e2ba59 JD |
1401 | |
1402 | /* | |
1403 | * The viewer should not ask for index on metadata stream. | |
1404 | */ | |
7591bab1 | 1405 | if (rstream->is_metadata) { |
c4e361a4 | 1406 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_HUP); |
d3e2ba59 JD |
1407 | goto send_reply; |
1408 | } | |
1409 | ||
878c34cf DG |
1410 | /* Try to open an index if one is needed for that stream. */ |
1411 | ret = try_open_index(vstream, rstream); | |
1412 | if (ret < 0) { | |
0e6830aa | 1413 | if (ret == -ENOENT) { |
d3e2ba59 | 1414 | /* |
7591bab1 MD |
1415 | * The index is created only when the first data |
1416 | * packet arrives, it might not be ready at the | |
1417 | * beginning of the session | |
d3e2ba59 | 1418 | */ |
c4e361a4 | 1419 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_RETRY); |
878c34cf DG |
1420 | } else { |
1421 | /* Unhandled error. */ | |
c4e361a4 | 1422 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR); |
d3e2ba59 | 1423 | } |
878c34cf | 1424 | goto send_reply; |
d3e2ba59 JD |
1425 | } |
1426 | ||
878c34cf | 1427 | ret = check_index_status(vstream, rstream, ctf_trace, &viewer_index); |
878c34cf | 1428 | if (ret < 0) { |
7591bab1 | 1429 | goto error_put; |
878c34cf DG |
1430 | } else if (ret == 1) { |
1431 | /* | |
7591bab1 MD |
1432 | * We have no index to send and check_index_status has populated |
1433 | * viewer_index's status. | |
878c34cf | 1434 | */ |
d3e2ba59 JD |
1435 | goto send_reply; |
1436 | } | |
7591bab1 | 1437 | /* At this point, ret is 0 thus we will be able to read the index. */ |
878c34cf | 1438 | assert(!ret); |
d3e2ba59 | 1439 | |
7591bab1 MD |
1440 | /* |
1441 | * vstream->stream_fd may be NULL if it has been closed by | |
1442 | * tracefile rotation, or if we are at the beginning of the | |
1443 | * stream. We open the data stream file here to protect against | |
1444 | * overwrite caused by tracefile rotation (in association with | |
1445 | * unlink performed before overwrite). | |
1446 | */ | |
1447 | if (!vstream->stream_fd) { | |
1448 | char fullpath[PATH_MAX]; | |
1449 | ||
1450 | if (vstream->stream->tracefile_count > 0) { | |
1451 | ret = snprintf(fullpath, PATH_MAX, "%s/%s_%" PRIu64, | |
1452 | vstream->path_name, | |
1453 | vstream->channel_name, | |
1454 | vstream->current_tracefile_id); | |
1455 | } else { | |
1456 | ret = snprintf(fullpath, PATH_MAX, "%s/%s", | |
1457 | vstream->path_name, | |
1458 | vstream->channel_name); | |
1459 | } | |
1460 | if (ret < 0) { | |
1461 | goto error_put; | |
1462 | } | |
bdafebb5 JG |
1463 | |
1464 | vstream->stream_fd = stream_fd_open(fullpath); | |
7591bab1 MD |
1465 | if (!vstream->stream_fd) { |
1466 | if (close(ret)) { | |
1467 | PERROR("close"); | |
1468 | } | |
1469 | goto error_put; | |
1470 | } | |
d3e2ba59 JD |
1471 | } |
1472 | ||
f04a971b | 1473 | ret = check_new_streams(conn); |
4a9daf17 | 1474 | if (ret < 0) { |
7591bab1 MD |
1475 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR); |
1476 | goto send_reply; | |
4a9daf17 JD |
1477 | } else if (ret == 1) { |
1478 | viewer_index.flags |= LTTNG_VIEWER_FLAG_NEW_STREAM; | |
1479 | } | |
1480 | ||
f465e978 | 1481 | ret = relay_index_file_read(vstream->index_file, &packet_index); |
e0547b83 | 1482 | if (ret) { |
f465e978 | 1483 | ERR("Relay error reading index file"); |
7591bab1 | 1484 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR); |
6b6b9a5a | 1485 | goto send_reply; |
d3e2ba59 | 1486 | } else { |
c4e361a4 | 1487 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_OK); |
a44ca2ca | 1488 | vstream->index_sent_seqcount++; |
d3e2ba59 JD |
1489 | } |
1490 | ||
1491 | /* | |
1492 | * Indexes are stored in big endian, no need to switch before sending. | |
1493 | */ | |
7591bab1 MD |
1494 | DBG("Sending viewer index for stream %" PRIu64 " offset %" PRIu64, |
1495 | rstream->stream_handle, | |
f8fc08d2 | 1496 | (uint64_t) be64toh(packet_index.offset)); |
d3e2ba59 JD |
1497 | viewer_index.offset = packet_index.offset; |
1498 | viewer_index.packet_size = packet_index.packet_size; | |
1499 | viewer_index.content_size = packet_index.content_size; | |
1500 | viewer_index.timestamp_begin = packet_index.timestamp_begin; | |
1501 | viewer_index.timestamp_end = packet_index.timestamp_end; | |
1502 | viewer_index.events_discarded = packet_index.events_discarded; | |
1503 | viewer_index.stream_id = packet_index.stream_id; | |
1504 | ||
1505 | send_reply: | |
f1883937 MD |
1506 | if (rstream) { |
1507 | pthread_mutex_unlock(&rstream->lock); | |
1508 | } | |
7591bab1 MD |
1509 | |
1510 | if (metadata_viewer_stream) { | |
1511 | pthread_mutex_lock(&metadata_viewer_stream->stream->lock); | |
1512 | DBG("get next index metadata check: recv %" PRIu64 | |
1513 | " sent %" PRIu64, | |
1514 | metadata_viewer_stream->stream->metadata_received, | |
1515 | metadata_viewer_stream->metadata_sent); | |
1516 | if (!metadata_viewer_stream->stream->metadata_received || | |
1517 | metadata_viewer_stream->stream->metadata_received > | |
1518 | metadata_viewer_stream->metadata_sent) { | |
1519 | viewer_index.flags |= LTTNG_VIEWER_FLAG_NEW_METADATA; | |
1520 | } | |
1521 | pthread_mutex_unlock(&metadata_viewer_stream->stream->lock); | |
1522 | } | |
1523 | ||
d3e2ba59 | 1524 | viewer_index.flags = htobe32(viewer_index.flags); |
eea7556c | 1525 | health_code_update(); |
2f8f53af | 1526 | |
58eb9381 | 1527 | ret = send_response(conn->sock, &viewer_index, sizeof(viewer_index)); |
d3e2ba59 | 1528 | if (ret < 0) { |
7591bab1 | 1529 | goto end; |
d3e2ba59 | 1530 | } |
eea7556c | 1531 | health_code_update(); |
d3e2ba59 | 1532 | |
9237e6a1 MD |
1533 | if (vstream) { |
1534 | DBG("Index %" PRIu64 " for stream %" PRIu64 " sent", | |
a44ca2ca | 1535 | vstream->index_sent_seqcount, |
9237e6a1 MD |
1536 | vstream->stream->stream_handle); |
1537 | } | |
d3e2ba59 | 1538 | end: |
7591bab1 MD |
1539 | if (metadata_viewer_stream) { |
1540 | viewer_stream_put(metadata_viewer_stream); | |
1541 | } | |
1542 | if (vstream) { | |
1543 | viewer_stream_put(vstream); | |
1544 | } | |
1545 | return ret; | |
1546 | ||
1547 | error_put: | |
1548 | pthread_mutex_unlock(&rstream->lock); | |
1549 | if (metadata_viewer_stream) { | |
1550 | viewer_stream_put(metadata_viewer_stream); | |
1551 | } | |
1552 | viewer_stream_put(vstream); | |
d3e2ba59 JD |
1553 | return ret; |
1554 | } | |
1555 | ||
1556 | /* | |
1557 | * Send the next index for a stream | |
1558 | * | |
1559 | * Return 0 on success or else a negative value. | |
1560 | */ | |
1561 | static | |
58eb9381 | 1562 | int viewer_get_packet(struct relay_connection *conn) |
d3e2ba59 | 1563 | { |
74ae0821 | 1564 | int ret, stream_fd = -1; |
b61e1dca | 1565 | off_t lseek_ret; |
6d1bce6b | 1566 | char *reply = NULL; |
d3e2ba59 | 1567 | struct lttng_viewer_get_packet get_packet_info; |
6d1bce6b | 1568 | struct lttng_viewer_trace_packet reply_header; |
7591bab1 | 1569 | struct relay_viewer_stream *vstream = NULL; |
6d1bce6b | 1570 | uint32_t reply_size = sizeof(reply_header); |
4e8db96d JR |
1571 | uint32_t packet_data_len = 0; |
1572 | ssize_t read_len; | |
d3e2ba59 JD |
1573 | |
1574 | DBG2("Relay get data packet"); | |
1575 | ||
eea7556c | 1576 | health_code_update(); |
2f8f53af | 1577 | |
7591bab1 MD |
1578 | ret = recv_request(conn->sock, &get_packet_info, |
1579 | sizeof(get_packet_info)); | |
2f8f53af | 1580 | if (ret < 0) { |
d3e2ba59 JD |
1581 | goto end; |
1582 | } | |
eea7556c | 1583 | health_code_update(); |
d3e2ba59 | 1584 | |
0233a6a5 | 1585 | /* From this point on, the error label can be reached. */ |
6d1bce6b | 1586 | memset(&reply_header, 0, sizeof(reply_header)); |
0233a6a5 | 1587 | |
7591bab1 MD |
1588 | vstream = viewer_stream_get_by_id(be64toh(get_packet_info.stream_id)); |
1589 | if (!vstream) { | |
a44ca2ca | 1590 | DBG("Client requested packet of unknown stream id %" PRIu64, |
f8fc08d2 | 1591 | (uint64_t) be64toh(get_packet_info.stream_id)); |
6d1bce6b JG |
1592 | reply_header.status = htobe32(LTTNG_VIEWER_GET_PACKET_ERR); |
1593 | goto send_reply_nolock; | |
4e8db96d JR |
1594 | } else { |
1595 | packet_data_len = be32toh(get_packet_info.len); | |
6d1bce6b | 1596 | reply_size += packet_data_len; |
d3e2ba59 | 1597 | } |
2a174661 | 1598 | |
6d1bce6b JG |
1599 | reply = zmalloc(reply_size); |
1600 | if (!reply) { | |
1601 | PERROR("packet reply zmalloc"); | |
1602 | reply_size = sizeof(reply_header); | |
d3e2ba59 JD |
1603 | goto error; |
1604 | } | |
1605 | ||
4e8db96d | 1606 | pthread_mutex_lock(&vstream->stream->lock); |
bdafebb5 JG |
1607 | stream_fd = stream_fd_get_fd(vstream->stream_fd); |
1608 | if (stream_fd < 0) { | |
1609 | ERR("Failed to get viewer stream file descriptor"); | |
74ae0821 | 1610 | goto error; |
bdafebb5 JG |
1611 | } |
1612 | lseek_ret = lseek(stream_fd, be64toh(get_packet_info.offset), SEEK_SET); | |
b61e1dca | 1613 | if (lseek_ret < 0) { |
bdafebb5 | 1614 | PERROR("lseek fd %d to offset %" PRIu64, stream_fd, |
f8fc08d2 | 1615 | (uint64_t) be64toh(get_packet_info.offset)); |
74ae0821 | 1616 | goto error; |
d3e2ba59 | 1617 | } |
bdafebb5 | 1618 | read_len = lttng_read(stream_fd, |
6d1bce6b | 1619 | reply + sizeof(reply_header), |
4e8db96d JR |
1620 | packet_data_len); |
1621 | if (read_len < packet_data_len) { | |
7591bab1 | 1622 | PERROR("Relay reading trace file, fd: %d, offset: %" PRIu64, |
bdafebb5 | 1623 | stream_fd, |
f8fc08d2 | 1624 | (uint64_t) be64toh(get_packet_info.offset)); |
74ae0821 | 1625 | goto error; |
d3e2ba59 | 1626 | } |
6d1bce6b JG |
1627 | reply_header.status = htobe32(LTTNG_VIEWER_GET_PACKET_OK); |
1628 | reply_header.len = htobe32(packet_data_len); | |
d3e2ba59 JD |
1629 | goto send_reply; |
1630 | ||
1631 | error: | |
6d1bce6b | 1632 | reply_header.status = htobe32(LTTNG_VIEWER_GET_PACKET_ERR); |
d3e2ba59 JD |
1633 | |
1634 | send_reply: | |
7591bab1 MD |
1635 | if (vstream) { |
1636 | pthread_mutex_unlock(&vstream->stream->lock); | |
1637 | } | |
1638 | send_reply_nolock: | |
eea7556c MD |
1639 | |
1640 | health_code_update(); | |
2f8f53af | 1641 | |
6d1bce6b JG |
1642 | if (reply) { |
1643 | memcpy(reply, &reply_header, sizeof(reply_header)); | |
1644 | ret = send_response(conn->sock, reply, reply_size); | |
1645 | } else { | |
1646 | /* No reply to send. */ | |
1647 | ret = send_response(conn->sock, &reply_header, | |
1648 | reply_size); | |
1649 | } | |
1650 | ||
4e8db96d | 1651 | health_code_update(); |
d3e2ba59 | 1652 | if (ret < 0) { |
4e8db96d | 1653 | PERROR("sendmsg of packet data failed"); |
7591bab1 | 1654 | goto end_free; |
d3e2ba59 | 1655 | } |
d3e2ba59 | 1656 | |
6d1bce6b | 1657 | DBG("Sent %u bytes for stream %" PRIu64, reply_size, |
f8fc08d2 | 1658 | (uint64_t) be64toh(get_packet_info.stream_id)); |
d3e2ba59 | 1659 | |
7591bab1 | 1660 | end_free: |
6d1bce6b | 1661 | free(reply); |
d3e2ba59 | 1662 | end: |
74ae0821 JG |
1663 | if (stream_fd >= 0) { |
1664 | stream_fd_put_fd(vstream->stream_fd); | |
1665 | } | |
7591bab1 MD |
1666 | if (vstream) { |
1667 | viewer_stream_put(vstream); | |
1668 | } | |
d3e2ba59 JD |
1669 | return ret; |
1670 | } | |
1671 | ||
1672 | /* | |
1673 | * Send the session's metadata | |
1674 | * | |
1675 | * Return 0 on success else a negative value. | |
1676 | */ | |
1677 | static | |
58eb9381 | 1678 | int viewer_get_metadata(struct relay_connection *conn) |
d3e2ba59 | 1679 | { |
bdafebb5 | 1680 | int ret = 0, stream_fd = -1; |
d3e2ba59 JD |
1681 | ssize_t read_len; |
1682 | uint64_t len = 0; | |
1683 | char *data = NULL; | |
1684 | struct lttng_viewer_get_metadata request; | |
1685 | struct lttng_viewer_metadata_packet reply; | |
7591bab1 | 1686 | struct relay_viewer_stream *vstream = NULL; |
d3e2ba59 | 1687 | |
58eb9381 | 1688 | assert(conn); |
d3e2ba59 JD |
1689 | |
1690 | DBG("Relay get metadata"); | |
1691 | ||
eea7556c | 1692 | health_code_update(); |
2f8f53af | 1693 | |
58eb9381 | 1694 | ret = recv_request(conn->sock, &request, sizeof(request)); |
2f8f53af | 1695 | if (ret < 0) { |
d3e2ba59 JD |
1696 | goto end; |
1697 | } | |
eea7556c | 1698 | health_code_update(); |
d3e2ba59 | 1699 | |
53efb85a MD |
1700 | memset(&reply, 0, sizeof(reply)); |
1701 | ||
7591bab1 MD |
1702 | vstream = viewer_stream_get_by_id(be64toh(request.stream_id)); |
1703 | if (!vstream) { | |
3b463131 MD |
1704 | /* |
1705 | * The metadata stream can be closed by a CLOSE command | |
1706 | * just before we attach. It can also be closed by | |
1707 | * per-pid tracing during tracing. Therefore, it is | |
1708 | * possible that we cannot find this viewer stream. | |
1709 | * Reply back to the client with an error if we cannot | |
1710 | * find it. | |
1711 | */ | |
a44ca2ca | 1712 | DBG("Client requested metadata of unknown stream id %" PRIu64, |
f8fc08d2 | 1713 | (uint64_t) be64toh(request.stream_id)); |
3b463131 | 1714 | reply.status = htobe32(LTTNG_VIEWER_METADATA_ERR); |
7591bab1 | 1715 | goto send_reply; |
d3e2ba59 | 1716 | } |
7591bab1 MD |
1717 | pthread_mutex_lock(&vstream->stream->lock); |
1718 | if (!vstream->stream->is_metadata) { | |
1719 | ERR("Invalid metadata stream"); | |
6763619c JD |
1720 | goto error; |
1721 | } | |
1722 | ||
7591bab1 | 1723 | assert(vstream->metadata_sent <= vstream->stream->metadata_received); |
2a174661 | 1724 | |
7591bab1 | 1725 | len = vstream->stream->metadata_received - vstream->metadata_sent; |
d3e2ba59 | 1726 | if (len == 0) { |
c4e361a4 | 1727 | reply.status = htobe32(LTTNG_VIEWER_NO_NEW_METADATA); |
d3e2ba59 JD |
1728 | goto send_reply; |
1729 | } | |
1730 | ||
1731 | /* first time, we open the metadata file */ | |
7591bab1 | 1732 | if (!vstream->stream_fd) { |
d3e2ba59 JD |
1733 | char fullpath[PATH_MAX]; |
1734 | ||
7591bab1 MD |
1735 | ret = snprintf(fullpath, PATH_MAX, "%s/%s", vstream->path_name, |
1736 | vstream->channel_name); | |
d3e2ba59 JD |
1737 | if (ret < 0) { |
1738 | goto error; | |
1739 | } | |
bdafebb5 | 1740 | vstream->stream_fd = stream_fd_open(fullpath); |
7591bab1 | 1741 | if (!vstream->stream_fd) { |
bdafebb5 | 1742 | PERROR("Failed to open viewer stream file at %s", fullpath); |
7591bab1 MD |
1743 | goto error; |
1744 | } | |
d3e2ba59 JD |
1745 | } |
1746 | ||
1747 | reply.len = htobe64(len); | |
1748 | data = zmalloc(len); | |
1749 | if (!data) { | |
1750 | PERROR("viewer metadata zmalloc"); | |
1751 | goto error; | |
1752 | } | |
1753 | ||
bdafebb5 JG |
1754 | stream_fd = stream_fd_get_fd(vstream->stream_fd); |
1755 | if (stream_fd < 0) { | |
74ae0821 | 1756 | goto error; |
bdafebb5 JG |
1757 | } |
1758 | read_len = lttng_read(stream_fd, data, len); | |
6cd525e8 | 1759 | if (read_len < len) { |
d3e2ba59 | 1760 | PERROR("Relay reading metadata file"); |
74ae0821 | 1761 | goto error; |
d3e2ba59 | 1762 | } |
7591bab1 MD |
1763 | vstream->metadata_sent += read_len; |
1764 | if (vstream->metadata_sent == vstream->stream->metadata_received | |
1765 | && vstream->stream->closed) { | |
1766 | /* Release ownership for the viewer metadata stream. */ | |
1767 | viewer_stream_put(vstream); | |
1768 | } | |
1769 | ||
c4e361a4 | 1770 | reply.status = htobe32(LTTNG_VIEWER_METADATA_OK); |
7591bab1 | 1771 | |
d3e2ba59 | 1772 | goto send_reply; |
d3e2ba59 | 1773 | error: |
c4e361a4 | 1774 | reply.status = htobe32(LTTNG_VIEWER_METADATA_ERR); |
d3e2ba59 JD |
1775 | |
1776 | send_reply: | |
eea7556c | 1777 | health_code_update(); |
7591bab1 MD |
1778 | if (vstream) { |
1779 | pthread_mutex_unlock(&vstream->stream->lock); | |
1780 | } | |
58eb9381 | 1781 | ret = send_response(conn->sock, &reply, sizeof(reply)); |
d3e2ba59 | 1782 | if (ret < 0) { |
7591bab1 | 1783 | goto end_free; |
d3e2ba59 | 1784 | } |
eea7556c | 1785 | health_code_update(); |
d3e2ba59 JD |
1786 | |
1787 | if (len > 0) { | |
58eb9381 | 1788 | ret = send_response(conn->sock, data, len); |
d3e2ba59 | 1789 | if (ret < 0) { |
7591bab1 | 1790 | goto end_free; |
d3e2ba59 JD |
1791 | } |
1792 | } | |
1793 | ||
1794 | DBG("Sent %" PRIu64 " bytes of metadata for stream %" PRIu64, len, | |
f8fc08d2 | 1795 | (uint64_t) be64toh(request.stream_id)); |
d3e2ba59 JD |
1796 | |
1797 | DBG("Metadata sent"); | |
1798 | ||
7591bab1 | 1799 | end_free: |
d3e2ba59 | 1800 | free(data); |
d3e2ba59 | 1801 | end: |
74ae0821 JG |
1802 | if (stream_fd >= 0) { |
1803 | stream_fd_put_fd(vstream->stream_fd); | |
1804 | } | |
7591bab1 MD |
1805 | if (vstream) { |
1806 | viewer_stream_put(vstream); | |
1807 | } | |
d3e2ba59 JD |
1808 | return ret; |
1809 | } | |
1810 | ||
c3b7390b JD |
1811 | /* |
1812 | * Create a viewer session. | |
1813 | * | |
1814 | * Return 0 on success or else a negative value. | |
1815 | */ | |
1816 | static | |
1817 | int viewer_create_session(struct relay_connection *conn) | |
1818 | { | |
1819 | int ret; | |
1820 | struct lttng_viewer_create_session_response resp; | |
1821 | ||
1822 | DBG("Viewer create session received"); | |
1823 | ||
53efb85a | 1824 | memset(&resp, 0, sizeof(resp)); |
c3b7390b | 1825 | resp.status = htobe32(LTTNG_VIEWER_CREATE_SESSION_OK); |
7591bab1 | 1826 | conn->viewer_session = viewer_session_create(); |
c3b7390b JD |
1827 | if (!conn->viewer_session) { |
1828 | ERR("Allocation viewer session"); | |
1829 | resp.status = htobe32(LTTNG_VIEWER_CREATE_SESSION_ERR); | |
1830 | goto send_reply; | |
1831 | } | |
c3b7390b JD |
1832 | |
1833 | send_reply: | |
1834 | health_code_update(); | |
1835 | ret = send_response(conn->sock, &resp, sizeof(resp)); | |
1836 | if (ret < 0) { | |
1837 | goto end; | |
1838 | } | |
1839 | health_code_update(); | |
1840 | ret = 0; | |
1841 | ||
1842 | end: | |
1843 | return ret; | |
1844 | } | |
1845 | ||
d62023be JD |
1846 | /* |
1847 | * Detach a viewer session. | |
1848 | * | |
1849 | * Return 0 on success or else a negative value. | |
1850 | */ | |
1851 | static | |
1852 | int viewer_detach_session(struct relay_connection *conn) | |
1853 | { | |
1854 | int ret; | |
1855 | struct lttng_viewer_detach_session_response response; | |
1856 | struct lttng_viewer_detach_session_request request; | |
1857 | struct relay_session *session = NULL; | |
1858 | uint64_t viewer_session_to_close; | |
1859 | ||
1860 | DBG("Viewer detach session received"); | |
1861 | ||
1862 | assert(conn); | |
1863 | ||
1864 | health_code_update(); | |
1865 | ||
1866 | /* Receive the request from the connected client. */ | |
1867 | ret = recv_request(conn->sock, &request, sizeof(request)); | |
1868 | if (ret < 0) { | |
1869 | goto end; | |
1870 | } | |
1871 | viewer_session_to_close = be64toh(request.session_id); | |
1872 | ||
1873 | if (!conn->viewer_session) { | |
1874 | DBG("Client trying to detach before creating a live viewer session"); | |
1875 | response.status = htobe32(LTTNG_VIEWER_DETACH_SESSION_ERR); | |
1876 | goto send_reply; | |
1877 | } | |
1878 | ||
1879 | health_code_update(); | |
1880 | ||
1881 | memset(&response, 0, sizeof(response)); | |
1882 | DBG("Detaching from session ID %" PRIu64, viewer_session_to_close); | |
1883 | ||
1884 | session = session_get_by_id(be64toh(request.session_id)); | |
1885 | if (!session) { | |
1886 | DBG("Relay session %" PRIu64 " not found", | |
f8fc08d2 | 1887 | (uint64_t) be64toh(request.session_id)); |
d62023be JD |
1888 | response.status = htobe32(LTTNG_VIEWER_DETACH_SESSION_UNK); |
1889 | goto send_reply; | |
1890 | } | |
1891 | ||
1892 | ret = viewer_session_is_attached(conn->viewer_session, session); | |
1893 | if (ret != 1) { | |
1894 | DBG("Not attached to this session"); | |
1895 | response.status = htobe32(LTTNG_VIEWER_DETACH_SESSION_ERR); | |
1896 | goto send_reply_put; | |
1897 | } | |
1898 | ||
1899 | viewer_session_close_one_session(conn->viewer_session, session); | |
1900 | response.status = htobe32(LTTNG_VIEWER_DETACH_SESSION_OK); | |
1901 | DBG("Session %" PRIu64 " detached.", viewer_session_to_close); | |
1902 | ||
1903 | send_reply_put: | |
1904 | session_put(session); | |
1905 | ||
1906 | send_reply: | |
1907 | health_code_update(); | |
1908 | ret = send_response(conn->sock, &response, sizeof(response)); | |
1909 | if (ret < 0) { | |
1910 | goto end; | |
1911 | } | |
1912 | health_code_update(); | |
1913 | ret = 0; | |
1914 | ||
1915 | end: | |
1916 | return ret; | |
1917 | } | |
c3b7390b | 1918 | |
d3e2ba59 JD |
1919 | /* |
1920 | * live_relay_unknown_command: send -1 if received unknown command | |
1921 | */ | |
1922 | static | |
58eb9381 | 1923 | void live_relay_unknown_command(struct relay_connection *conn) |
d3e2ba59 JD |
1924 | { |
1925 | struct lttcomm_relayd_generic_reply reply; | |
d3e2ba59 | 1926 | |
53efb85a | 1927 | memset(&reply, 0, sizeof(reply)); |
d3e2ba59 | 1928 | reply.ret_code = htobe32(LTTNG_ERR_UNK); |
58eb9381 | 1929 | (void) send_response(conn->sock, &reply, sizeof(reply)); |
d3e2ba59 JD |
1930 | } |
1931 | ||
1932 | /* | |
1933 | * Process the commands received on the control socket | |
1934 | */ | |
1935 | static | |
1936 | int process_control(struct lttng_viewer_cmd *recv_hdr, | |
58eb9381 | 1937 | struct relay_connection *conn) |
d3e2ba59 JD |
1938 | { |
1939 | int ret = 0; | |
2f8f53af DG |
1940 | uint32_t msg_value; |
1941 | ||
2f8f53af DG |
1942 | msg_value = be32toh(recv_hdr->cmd); |
1943 | ||
1944 | /* | |
1945 | * Make sure we've done the version check before any command other then a | |
1946 | * new client connection. | |
1947 | */ | |
c4e361a4 | 1948 | if (msg_value != LTTNG_VIEWER_CONNECT && !conn->version_check_done) { |
58eb9381 | 1949 | ERR("Viewer conn value %" PRIu32 " before version check", msg_value); |
2f8f53af DG |
1950 | ret = -1; |
1951 | goto end; | |
1952 | } | |
d3e2ba59 | 1953 | |
2f8f53af | 1954 | switch (msg_value) { |
c4e361a4 | 1955 | case LTTNG_VIEWER_CONNECT: |
58eb9381 | 1956 | ret = viewer_connect(conn); |
d3e2ba59 | 1957 | break; |
c4e361a4 | 1958 | case LTTNG_VIEWER_LIST_SESSIONS: |
58eb9381 | 1959 | ret = viewer_list_sessions(conn); |
d3e2ba59 | 1960 | break; |
c4e361a4 | 1961 | case LTTNG_VIEWER_ATTACH_SESSION: |
58eb9381 | 1962 | ret = viewer_attach_session(conn); |
d3e2ba59 | 1963 | break; |
c4e361a4 | 1964 | case LTTNG_VIEWER_GET_NEXT_INDEX: |
58eb9381 | 1965 | ret = viewer_get_next_index(conn); |
d3e2ba59 | 1966 | break; |
c4e361a4 | 1967 | case LTTNG_VIEWER_GET_PACKET: |
58eb9381 | 1968 | ret = viewer_get_packet(conn); |
d3e2ba59 | 1969 | break; |
c4e361a4 | 1970 | case LTTNG_VIEWER_GET_METADATA: |
58eb9381 | 1971 | ret = viewer_get_metadata(conn); |
d3e2ba59 | 1972 | break; |
c4e361a4 | 1973 | case LTTNG_VIEWER_GET_NEW_STREAMS: |
58eb9381 | 1974 | ret = viewer_get_new_streams(conn); |
80e8027a | 1975 | break; |
c3b7390b JD |
1976 | case LTTNG_VIEWER_CREATE_SESSION: |
1977 | ret = viewer_create_session(conn); | |
1978 | break; | |
d62023be JD |
1979 | case LTTNG_VIEWER_DETACH_SESSION: |
1980 | ret = viewer_detach_session(conn); | |
1981 | break; | |
d3e2ba59 | 1982 | default: |
7591bab1 MD |
1983 | ERR("Received unknown viewer command (%u)", |
1984 | be32toh(recv_hdr->cmd)); | |
58eb9381 | 1985 | live_relay_unknown_command(conn); |
d3e2ba59 JD |
1986 | ret = -1; |
1987 | goto end; | |
1988 | } | |
1989 | ||
1990 | end: | |
1991 | return ret; | |
1992 | } | |
1993 | ||
1994 | static | |
58eb9381 | 1995 | void cleanup_connection_pollfd(struct lttng_poll_event *events, int pollfd) |
d3e2ba59 JD |
1996 | { |
1997 | int ret; | |
1998 | ||
58eb9381 | 1999 | (void) lttng_poll_del(events, pollfd); |
d3e2ba59 | 2000 | |
064bcffc JG |
2001 | ret = fd_tracker_close_unsuspendable_fd(the_fd_tracker, &pollfd, 1, |
2002 | fd_tracker_util_close_fd, NULL); | |
d3e2ba59 JD |
2003 | if (ret < 0) { |
2004 | ERR("Closing pollfd %d", pollfd); | |
2005 | } | |
2006 | } | |
2007 | ||
d3e2ba59 JD |
2008 | /* |
2009 | * This thread does the actual work | |
2010 | */ | |
2011 | static | |
2012 | void *thread_worker(void *data) | |
2013 | { | |
2014 | int ret, err = -1; | |
2015 | uint32_t nb_fd; | |
d3e2ba59 | 2016 | struct lttng_poll_event events; |
7591bab1 | 2017 | struct lttng_ht *viewer_connections_ht; |
d3e2ba59 JD |
2018 | struct lttng_ht_iter iter; |
2019 | struct lttng_viewer_cmd recv_hdr; | |
302d8906 | 2020 | struct relay_connection *destroy_conn; |
d3e2ba59 JD |
2021 | |
2022 | DBG("[thread] Live viewer relay worker started"); | |
2023 | ||
2024 | rcu_register_thread(); | |
2025 | ||
eea7556c MD |
2026 | health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_WORKER); |
2027 | ||
9b5e0863 MD |
2028 | if (testpoint(relayd_thread_live_worker)) { |
2029 | goto error_testpoint; | |
2030 | } | |
2031 | ||
d3e2ba59 | 2032 | /* table of connections indexed on socket */ |
7591bab1 MD |
2033 | viewer_connections_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
2034 | if (!viewer_connections_ht) { | |
2035 | goto viewer_connections_ht_error; | |
d3e2ba59 JD |
2036 | } |
2037 | ||
a85f1bc1 JG |
2038 | ret = create_named_thread_poll_set(&events, 2, |
2039 | "Live viewer worker thread epoll"); | |
d3e2ba59 JD |
2040 | if (ret < 0) { |
2041 | goto error_poll_create; | |
2042 | } | |
2043 | ||
58eb9381 | 2044 | ret = lttng_poll_add(&events, live_conn_pipe[0], LPOLLIN | LPOLLRDHUP); |
d3e2ba59 JD |
2045 | if (ret < 0) { |
2046 | goto error; | |
2047 | } | |
2048 | ||
2049 | restart: | |
2050 | while (1) { | |
2051 | int i; | |
2052 | ||
eea7556c MD |
2053 | health_code_update(); |
2054 | ||
d3e2ba59 JD |
2055 | /* Infinite blocking call, waiting for transmission */ |
2056 | DBG3("Relayd live viewer worker thread polling..."); | |
eea7556c | 2057 | health_poll_entry(); |
d3e2ba59 | 2058 | ret = lttng_poll_wait(&events, -1); |
eea7556c | 2059 | health_poll_exit(); |
d3e2ba59 JD |
2060 | if (ret < 0) { |
2061 | /* | |
2062 | * Restart interrupted system call. | |
2063 | */ | |
2064 | if (errno == EINTR) { | |
2065 | goto restart; | |
2066 | } | |
2067 | goto error; | |
2068 | } | |
2069 | ||
2070 | nb_fd = ret; | |
2071 | ||
2072 | /* | |
2073 | * Process control. The control connection is prioritised so we don't | |
2074 | * starve it with high throughput tracing data on the data | |
2075 | * connection. | |
2076 | */ | |
2077 | for (i = 0; i < nb_fd; i++) { | |
2078 | /* Fetch once the poll data */ | |
2079 | uint32_t revents = LTTNG_POLL_GETEV(&events, i); | |
2080 | int pollfd = LTTNG_POLL_GETFD(&events, i); | |
2081 | ||
eea7556c MD |
2082 | health_code_update(); |
2083 | ||
fd20dac9 MD |
2084 | if (!revents) { |
2085 | /* No activity for this FD (poll implementation). */ | |
2086 | continue; | |
2087 | } | |
2088 | ||
d3e2ba59 | 2089 | /* Thread quit pipe has been closed. Killing thread. */ |
bcf4a440 | 2090 | ret = check_thread_quit_pipe(pollfd, revents); |
d3e2ba59 JD |
2091 | if (ret) { |
2092 | err = 0; | |
2093 | goto exit; | |
2094 | } | |
2095 | ||
7591bab1 | 2096 | /* Inspect the relay conn pipe for new connection. */ |
58eb9381 | 2097 | if (pollfd == live_conn_pipe[0]) { |
03e43155 | 2098 | if (revents & LPOLLIN) { |
302d8906 JG |
2099 | struct relay_connection *conn; |
2100 | ||
7591bab1 MD |
2101 | ret = lttng_read(live_conn_pipe[0], |
2102 | &conn, sizeof(conn)); | |
d3e2ba59 JD |
2103 | if (ret < 0) { |
2104 | goto error; | |
2105 | } | |
58eb9381 DG |
2106 | lttng_poll_add(&events, conn->sock->fd, |
2107 | LPOLLIN | LPOLLRDHUP); | |
7591bab1 MD |
2108 | connection_ht_add(viewer_connections_ht, conn); |
2109 | DBG("Connection socket %d added to poll", conn->sock->fd); | |
03e43155 MD |
2110 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
2111 | ERR("Relay live pipe error"); | |
2112 | goto error; | |
2113 | } else { | |
2114 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
2115 | goto error; | |
d3e2ba59 | 2116 | } |
58eb9381 | 2117 | } else { |
7591bab1 | 2118 | /* Connection activity. */ |
302d8906 JG |
2119 | struct relay_connection *conn; |
2120 | ||
7591bab1 MD |
2121 | conn = connection_get_by_sock(viewer_connections_ht, pollfd); |
2122 | if (!conn) { | |
2123 | continue; | |
2124 | } | |
58eb9381 | 2125 | |
03e43155 | 2126 | if (revents & LPOLLIN) { |
58eb9381 DG |
2127 | ret = conn->sock->ops->recvmsg(conn->sock, &recv_hdr, |
2128 | sizeof(recv_hdr), 0); | |
d3e2ba59 | 2129 | if (ret <= 0) { |
7591bab1 | 2130 | /* Connection closed. */ |
58eb9381 | 2131 | cleanup_connection_pollfd(&events, pollfd); |
7591bab1 MD |
2132 | /* Put "create" ownership reference. */ |
2133 | connection_put(conn); | |
58eb9381 | 2134 | DBG("Viewer control conn closed with %d", pollfd); |
d3e2ba59 | 2135 | } else { |
58eb9381 | 2136 | ret = process_control(&recv_hdr, conn); |
d3e2ba59 JD |
2137 | if (ret < 0) { |
2138 | /* Clear the session on error. */ | |
58eb9381 | 2139 | cleanup_connection_pollfd(&events, pollfd); |
7591bab1 MD |
2140 | /* Put "create" ownership reference. */ |
2141 | connection_put(conn); | |
d3e2ba59 JD |
2142 | DBG("Viewer connection closed with %d", pollfd); |
2143 | } | |
2144 | } | |
03e43155 MD |
2145 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
2146 | cleanup_connection_pollfd(&events, pollfd); | |
2147 | /* Put "create" ownership reference. */ | |
2148 | connection_put(conn); | |
2149 | } else { | |
2150 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
2151 | connection_put(conn); | |
2152 | goto error; | |
d3e2ba59 | 2153 | } |
7591bab1 MD |
2154 | /* Put local "get_by_sock" reference. */ |
2155 | connection_put(conn); | |
d3e2ba59 JD |
2156 | } |
2157 | } | |
2158 | } | |
2159 | ||
2160 | exit: | |
2161 | error: | |
a85f1bc1 | 2162 | (void) fd_tracker_util_poll_clean(the_fd_tracker, &events); |
d3e2ba59 | 2163 | |
58eb9381 | 2164 | /* Cleanup reamaining connection object. */ |
d3e2ba59 | 2165 | rcu_read_lock(); |
7591bab1 | 2166 | cds_lfht_for_each_entry(viewer_connections_ht->ht, &iter.iter, |
302d8906 | 2167 | destroy_conn, |
58eb9381 | 2168 | sock_n.node) { |
eea7556c | 2169 | health_code_update(); |
7591bab1 | 2170 | connection_put(destroy_conn); |
d3e2ba59 JD |
2171 | } |
2172 | rcu_read_unlock(); | |
2173 | error_poll_create: | |
7591bab1 MD |
2174 | lttng_ht_destroy(viewer_connections_ht); |
2175 | viewer_connections_ht_error: | |
58eb9381 | 2176 | /* Close relay conn pipes */ |
07bc1945 | 2177 | (void) fd_tracker_util_pipe_close(the_fd_tracker, live_conn_pipe); |
d3e2ba59 JD |
2178 | if (err) { |
2179 | DBG("Viewer worker thread exited with error"); | |
2180 | } | |
2181 | DBG("Viewer worker thread cleanup complete"); | |
9b5e0863 | 2182 | error_testpoint: |
eea7556c MD |
2183 | if (err) { |
2184 | health_error(); | |
2185 | ERR("Health error occurred in %s", __func__); | |
2186 | } | |
2187 | health_unregister(health_relayd); | |
b4aacfdc MD |
2188 | if (lttng_relay_stop_threads()) { |
2189 | ERR("Error stopping threads"); | |
178a0557 | 2190 | } |
d3e2ba59 JD |
2191 | rcu_unregister_thread(); |
2192 | return NULL; | |
2193 | } | |
2194 | ||
2195 | /* | |
2196 | * Create the relay command pipe to wake thread_manage_apps. | |
2197 | * Closed in cleanup(). | |
2198 | */ | |
58eb9381 | 2199 | static int create_conn_pipe(void) |
d3e2ba59 | 2200 | { |
07bc1945 JG |
2201 | return fd_tracker_util_pipe_open_cloexec(the_fd_tracker, |
2202 | "Live connection pipe", live_conn_pipe); | |
178a0557 | 2203 | } |
d3e2ba59 | 2204 | |
178a0557 | 2205 | int relayd_live_join(void) |
d3e2ba59 | 2206 | { |
178a0557 | 2207 | int ret, retval = 0; |
d3e2ba59 JD |
2208 | void *status; |
2209 | ||
d3e2ba59 | 2210 | ret = pthread_join(live_listener_thread, &status); |
178a0557 MD |
2211 | if (ret) { |
2212 | errno = ret; | |
d3e2ba59 | 2213 | PERROR("pthread_join live listener"); |
178a0557 | 2214 | retval = -1; |
d3e2ba59 JD |
2215 | } |
2216 | ||
2217 | ret = pthread_join(live_worker_thread, &status); | |
178a0557 MD |
2218 | if (ret) { |
2219 | errno = ret; | |
d3e2ba59 | 2220 | PERROR("pthread_join live worker"); |
178a0557 | 2221 | retval = -1; |
d3e2ba59 JD |
2222 | } |
2223 | ||
2224 | ret = pthread_join(live_dispatcher_thread, &status); | |
178a0557 MD |
2225 | if (ret) { |
2226 | errno = ret; | |
d3e2ba59 | 2227 | PERROR("pthread_join live dispatcher"); |
178a0557 | 2228 | retval = -1; |
d3e2ba59 JD |
2229 | } |
2230 | ||
178a0557 | 2231 | cleanup_relayd_live(); |
d3e2ba59 | 2232 | |
178a0557 | 2233 | return retval; |
d3e2ba59 JD |
2234 | } |
2235 | ||
2236 | /* | |
2237 | * main | |
2238 | */ | |
7591bab1 | 2239 | int relayd_live_create(struct lttng_uri *uri) |
d3e2ba59 | 2240 | { |
178a0557 | 2241 | int ret = 0, retval = 0; |
d3e2ba59 JD |
2242 | void *status; |
2243 | int is_root; | |
2244 | ||
178a0557 MD |
2245 | if (!uri) { |
2246 | retval = -1; | |
2247 | goto exit_init_data; | |
2248 | } | |
d3e2ba59 JD |
2249 | live_uri = uri; |
2250 | ||
d3e2ba59 JD |
2251 | /* Check if daemon is UID = 0 */ |
2252 | is_root = !getuid(); | |
2253 | ||
2254 | if (!is_root) { | |
2255 | if (live_uri->port < 1024) { | |
2256 | ERR("Need to be root to use ports < 1024"); | |
178a0557 MD |
2257 | retval = -1; |
2258 | goto exit_init_data; | |
d3e2ba59 JD |
2259 | } |
2260 | } | |
2261 | ||
2262 | /* Setup the thread apps communication pipe. */ | |
178a0557 MD |
2263 | if (create_conn_pipe()) { |
2264 | retval = -1; | |
2265 | goto exit_init_data; | |
d3e2ba59 JD |
2266 | } |
2267 | ||
2268 | /* Init relay command queue. */ | |
8bdee6e2 | 2269 | cds_wfcq_init(&viewer_conn_queue.head, &viewer_conn_queue.tail); |
d3e2ba59 JD |
2270 | |
2271 | /* Set up max poll set size */ | |
25b397f9 MD |
2272 | if (lttng_poll_set_max_size()) { |
2273 | retval = -1; | |
2274 | goto exit_init_data; | |
2275 | } | |
d3e2ba59 JD |
2276 | |
2277 | /* Setup the dispatcher thread */ | |
1a1a34b4 | 2278 | ret = pthread_create(&live_dispatcher_thread, default_pthread_attr(), |
d3e2ba59 | 2279 | thread_dispatcher, (void *) NULL); |
178a0557 MD |
2280 | if (ret) { |
2281 | errno = ret; | |
d3e2ba59 | 2282 | PERROR("pthread_create viewer dispatcher"); |
178a0557 MD |
2283 | retval = -1; |
2284 | goto exit_dispatcher_thread; | |
d3e2ba59 JD |
2285 | } |
2286 | ||
2287 | /* Setup the worker thread */ | |
1a1a34b4 | 2288 | ret = pthread_create(&live_worker_thread, default_pthread_attr(), |
7591bab1 | 2289 | thread_worker, NULL); |
178a0557 MD |
2290 | if (ret) { |
2291 | errno = ret; | |
d3e2ba59 | 2292 | PERROR("pthread_create viewer worker"); |
178a0557 MD |
2293 | retval = -1; |
2294 | goto exit_worker_thread; | |
d3e2ba59 JD |
2295 | } |
2296 | ||
2297 | /* Setup the listener thread */ | |
1a1a34b4 | 2298 | ret = pthread_create(&live_listener_thread, default_pthread_attr(), |
d3e2ba59 | 2299 | thread_listener, (void *) NULL); |
178a0557 MD |
2300 | if (ret) { |
2301 | errno = ret; | |
d3e2ba59 | 2302 | PERROR("pthread_create viewer listener"); |
178a0557 MD |
2303 | retval = -1; |
2304 | goto exit_listener_thread; | |
d3e2ba59 JD |
2305 | } |
2306 | ||
178a0557 MD |
2307 | /* |
2308 | * All OK, started all threads. | |
2309 | */ | |
2310 | return retval; | |
2311 | ||
9911d21b JG |
2312 | /* |
2313 | * Join on the live_listener_thread should anything be added after | |
2314 | * the live_listener thread's creation. | |
2315 | */ | |
d3e2ba59 | 2316 | |
178a0557 | 2317 | exit_listener_thread: |
d3e2ba59 | 2318 | |
d3e2ba59 | 2319 | ret = pthread_join(live_worker_thread, &status); |
178a0557 MD |
2320 | if (ret) { |
2321 | errno = ret; | |
d3e2ba59 | 2322 | PERROR("pthread_join live worker"); |
178a0557 | 2323 | retval = -1; |
d3e2ba59 | 2324 | } |
178a0557 | 2325 | exit_worker_thread: |
d3e2ba59 | 2326 | |
d3e2ba59 | 2327 | ret = pthread_join(live_dispatcher_thread, &status); |
178a0557 MD |
2328 | if (ret) { |
2329 | errno = ret; | |
d3e2ba59 | 2330 | PERROR("pthread_join live dispatcher"); |
178a0557 | 2331 | retval = -1; |
d3e2ba59 | 2332 | } |
178a0557 | 2333 | exit_dispatcher_thread: |
d3e2ba59 | 2334 | |
178a0557 MD |
2335 | exit_init_data: |
2336 | cleanup_relayd_live(); | |
d3e2ba59 | 2337 | |
178a0557 | 2338 | return retval; |
d3e2ba59 | 2339 | } |