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> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License, version 2 only, | |
7 | * as published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
12 | * more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License along | |
15 | * with this program; if not, write to the Free Software Foundation, Inc., | |
16 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
17 | */ | |
18 | ||
19 | #define _GNU_SOURCE | |
20 | #include <getopt.h> | |
21 | #include <grp.h> | |
22 | #include <limits.h> | |
23 | #include <pthread.h> | |
24 | #include <signal.h> | |
25 | #include <stdio.h> | |
26 | #include <stdlib.h> | |
27 | #include <string.h> | |
28 | #include <sys/mman.h> | |
29 | #include <sys/mount.h> | |
30 | #include <sys/resource.h> | |
31 | #include <sys/socket.h> | |
32 | #include <sys/stat.h> | |
33 | #include <sys/types.h> | |
34 | #include <sys/wait.h> | |
35 | #include <inttypes.h> | |
36 | #include <urcu/futex.h> | |
37 | #include <urcu/uatomic.h> | |
38 | #include <unistd.h> | |
39 | #include <fcntl.h> | |
40 | #include <config.h> | |
41 | ||
42 | #include <lttng/lttng.h> | |
43 | #include <common/common.h> | |
44 | #include <common/compat/poll.h> | |
45 | #include <common/compat/socket.h> | |
46 | #include <common/defaults.h> | |
47 | #include <common/futex.h> | |
48 | #include <common/sessiond-comm/sessiond-comm.h> | |
49 | #include <common/sessiond-comm/inet.h> | |
50 | #include <common/sessiond-comm/relayd.h> | |
51 | #include <common/uri.h> | |
52 | #include <common/utils.h> | |
53 | ||
54 | #include "cmd.h" | |
55 | #include "live.h" | |
56 | #include "lttng-relayd.h" | |
57 | #include "lttng-viewer.h" | |
58 | #include "utils.h" | |
eea7556c | 59 | #include "health-relayd.h" |
9b5e0863 | 60 | #include "testpoint.h" |
d3e2ba59 JD |
61 | |
62 | static struct lttng_uri *live_uri; | |
63 | ||
d3e2ba59 JD |
64 | /* |
65 | * This pipe is used to inform the worker thread that a command is queued and | |
66 | * ready to be processed. | |
67 | */ | |
68 | static int live_relay_cmd_pipe[2] = { -1, -1 }; | |
69 | ||
70 | /* Shared between threads */ | |
71 | static int live_dispatch_thread_exit; | |
72 | ||
73 | static pthread_t live_listener_thread; | |
74 | static pthread_t live_dispatcher_thread; | |
75 | static pthread_t live_worker_thread; | |
76 | ||
77 | /* | |
78 | * Relay command queue. | |
79 | * | |
80 | * The live_thread_listener and live_thread_dispatcher communicate with this | |
81 | * queue. | |
82 | */ | |
83 | static struct relay_cmd_queue viewer_cmd_queue; | |
84 | ||
85 | static uint64_t last_relay_viewer_session_id; | |
86 | ||
87 | /* | |
88 | * Cleanup the daemon | |
89 | */ | |
90 | static | |
91 | void cleanup(void) | |
92 | { | |
93 | DBG("Cleaning up"); | |
94 | ||
d3e2ba59 JD |
95 | free(live_uri); |
96 | } | |
97 | ||
98 | /* | |
99 | * Write to writable pipe used to notify a thread. | |
100 | */ | |
101 | static | |
102 | int notify_thread_pipe(int wpipe) | |
103 | { | |
6cd525e8 | 104 | ssize_t ret; |
d3e2ba59 | 105 | |
6cd525e8 MD |
106 | ret = lttng_write(wpipe, "!", 1); |
107 | if (ret < 1) { | |
d3e2ba59 JD |
108 | PERROR("write poll pipe"); |
109 | } | |
110 | ||
6cd525e8 | 111 | return (int) ret; |
d3e2ba59 JD |
112 | } |
113 | ||
114 | /* | |
115 | * Stop all threads by closing the thread quit pipe. | |
116 | */ | |
117 | static | |
118 | void stop_threads(void) | |
119 | { | |
120 | int ret; | |
121 | ||
122 | /* Stopping all threads */ | |
123 | DBG("Terminating all live threads"); | |
0b242f62 | 124 | ret = notify_thread_pipe(thread_quit_pipe[1]); |
d3e2ba59 JD |
125 | if (ret < 0) { |
126 | ERR("write error on thread quit pipe"); | |
127 | } | |
128 | ||
129 | /* Dispatch thread */ | |
130 | CMM_STORE_SHARED(live_dispatch_thread_exit, 1); | |
131 | futex_nto1_wake(&viewer_cmd_queue.futex); | |
132 | } | |
133 | ||
d3e2ba59 JD |
134 | /* |
135 | * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set. | |
136 | */ | |
137 | static | |
138 | int create_thread_poll_set(struct lttng_poll_event *events, int size) | |
139 | { | |
140 | int ret; | |
141 | ||
142 | if (events == NULL || size == 0) { | |
143 | ret = -1; | |
144 | goto error; | |
145 | } | |
146 | ||
147 | ret = lttng_poll_create(events, size, LTTNG_CLOEXEC); | |
148 | if (ret < 0) { | |
149 | goto error; | |
150 | } | |
151 | ||
152 | /* Add quit pipe */ | |
0b242f62 | 153 | ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN | LPOLLERR); |
d3e2ba59 JD |
154 | if (ret < 0) { |
155 | goto error; | |
156 | } | |
157 | ||
158 | return 0; | |
159 | ||
160 | error: | |
161 | return ret; | |
162 | } | |
163 | ||
164 | /* | |
165 | * Check if the thread quit pipe was triggered. | |
166 | * | |
167 | * Return 1 if it was triggered else 0; | |
168 | */ | |
169 | static | |
170 | int check_thread_quit_pipe(int fd, uint32_t events) | |
171 | { | |
0b242f62 | 172 | if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) { |
d3e2ba59 JD |
173 | return 1; |
174 | } | |
175 | ||
176 | return 0; | |
177 | } | |
178 | ||
179 | /* | |
180 | * Create and init socket from uri. | |
181 | */ | |
182 | static | |
183 | struct lttcomm_sock *init_socket(struct lttng_uri *uri) | |
184 | { | |
185 | int ret; | |
186 | struct lttcomm_sock *sock = NULL; | |
187 | ||
188 | sock = lttcomm_alloc_sock_from_uri(uri); | |
189 | if (sock == NULL) { | |
190 | ERR("Allocating socket"); | |
191 | goto error; | |
192 | } | |
193 | ||
194 | ret = lttcomm_create_sock(sock); | |
195 | if (ret < 0) { | |
196 | goto error; | |
197 | } | |
198 | DBG("Listening on sock %d for live", sock->fd); | |
199 | ||
200 | ret = sock->ops->bind(sock); | |
201 | if (ret < 0) { | |
202 | goto error; | |
203 | } | |
204 | ||
205 | ret = sock->ops->listen(sock, -1); | |
206 | if (ret < 0) { | |
207 | goto error; | |
208 | ||
209 | } | |
210 | ||
211 | return sock; | |
212 | ||
213 | error: | |
214 | if (sock) { | |
215 | lttcomm_destroy_sock(sock); | |
216 | } | |
217 | return NULL; | |
218 | } | |
219 | ||
220 | /* | |
221 | * This thread manages the listening for new connections on the network | |
222 | */ | |
223 | static | |
224 | void *thread_listener(void *data) | |
225 | { | |
226 | int i, ret, pollfd, err = -1; | |
227 | int val = 1; | |
228 | uint32_t revents, nb_fd; | |
229 | struct lttng_poll_event events; | |
230 | struct lttcomm_sock *live_control_sock; | |
231 | ||
232 | DBG("[thread] Relay live listener started"); | |
233 | ||
eea7556c MD |
234 | health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_LISTENER); |
235 | ||
236 | health_code_update(); | |
237 | ||
d3e2ba59 JD |
238 | live_control_sock = init_socket(live_uri); |
239 | if (!live_control_sock) { | |
240 | goto error_sock_control; | |
241 | } | |
242 | ||
fb4d42ab | 243 | /* Pass 2 as size here for the thread quit pipe and control sockets. */ |
d3e2ba59 JD |
244 | ret = create_thread_poll_set(&events, 2); |
245 | if (ret < 0) { | |
246 | goto error_create_poll; | |
247 | } | |
248 | ||
249 | /* Add the control socket */ | |
250 | ret = lttng_poll_add(&events, live_control_sock->fd, LPOLLIN | LPOLLRDHUP); | |
251 | if (ret < 0) { | |
252 | goto error_poll_add; | |
253 | } | |
254 | ||
3fd27398 MD |
255 | lttng_relay_notify_ready(); |
256 | ||
9b5e0863 MD |
257 | if (testpoint(relayd_thread_live_listener)) { |
258 | goto error_testpoint; | |
259 | } | |
260 | ||
d3e2ba59 | 261 | while (1) { |
eea7556c MD |
262 | health_code_update(); |
263 | ||
d3e2ba59 JD |
264 | DBG("Listener accepting live viewers connections"); |
265 | ||
266 | restart: | |
eea7556c | 267 | health_poll_entry(); |
d3e2ba59 | 268 | ret = lttng_poll_wait(&events, -1); |
eea7556c | 269 | health_poll_exit(); |
d3e2ba59 JD |
270 | if (ret < 0) { |
271 | /* | |
272 | * Restart interrupted system call. | |
273 | */ | |
274 | if (errno == EINTR) { | |
275 | goto restart; | |
276 | } | |
277 | goto error; | |
278 | } | |
279 | nb_fd = ret; | |
280 | ||
281 | DBG("Relay new viewer connection received"); | |
282 | for (i = 0; i < nb_fd; i++) { | |
eea7556c MD |
283 | health_code_update(); |
284 | ||
d3e2ba59 JD |
285 | /* Fetch once the poll data */ |
286 | revents = LTTNG_POLL_GETEV(&events, i); | |
287 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
288 | ||
289 | /* Thread quit pipe has been closed. Killing thread. */ | |
290 | ret = check_thread_quit_pipe(pollfd, revents); | |
291 | if (ret) { | |
292 | err = 0; | |
293 | goto exit; | |
294 | } | |
295 | ||
296 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
297 | ERR("socket poll error"); | |
298 | goto error; | |
299 | } else if (revents & LPOLLIN) { | |
300 | /* | |
301 | * Get allocated in this thread, enqueued to a global queue, | |
302 | * dequeued and freed in the worker thread. | |
303 | */ | |
304 | struct relay_command *relay_cmd; | |
305 | struct lttcomm_sock *newsock; | |
306 | ||
307 | relay_cmd = zmalloc(sizeof(*relay_cmd)); | |
308 | if (!relay_cmd) { | |
309 | PERROR("relay command zmalloc"); | |
310 | goto error; | |
311 | } | |
312 | ||
313 | assert(pollfd == live_control_sock->fd); | |
314 | newsock = live_control_sock->ops->accept(live_control_sock); | |
315 | if (!newsock) { | |
316 | PERROR("accepting control sock"); | |
317 | free(relay_cmd); | |
318 | goto error; | |
319 | } | |
320 | DBG("Relay viewer connection accepted socket %d", newsock->fd); | |
321 | ret = setsockopt(newsock->fd, SOL_SOCKET, SO_REUSEADDR, &val, | |
322 | sizeof(int)); | |
323 | if (ret < 0) { | |
324 | PERROR("setsockopt inet"); | |
325 | lttcomm_destroy_sock(newsock); | |
326 | free(relay_cmd); | |
327 | goto error; | |
328 | } | |
329 | relay_cmd->sock = newsock; | |
330 | ||
331 | /* | |
332 | * Lock free enqueue the request. | |
333 | */ | |
334 | cds_wfq_enqueue(&viewer_cmd_queue.queue, &relay_cmd->node); | |
335 | ||
336 | /* | |
337 | * Wake the dispatch queue futex. Implicit memory | |
338 | * barrier with the exchange in cds_wfq_enqueue. | |
339 | */ | |
340 | futex_nto1_wake(&viewer_cmd_queue.futex); | |
341 | } | |
342 | } | |
343 | } | |
344 | ||
345 | exit: | |
346 | error: | |
347 | error_poll_add: | |
9b5e0863 | 348 | error_testpoint: |
d3e2ba59 JD |
349 | lttng_poll_clean(&events); |
350 | error_create_poll: | |
351 | if (live_control_sock->fd >= 0) { | |
352 | ret = live_control_sock->ops->close(live_control_sock); | |
353 | if (ret) { | |
354 | PERROR("close"); | |
355 | } | |
356 | } | |
357 | lttcomm_destroy_sock(live_control_sock); | |
358 | error_sock_control: | |
359 | if (err) { | |
eea7556c | 360 | health_error(); |
d3e2ba59 JD |
361 | DBG("Live viewer listener thread exited with error"); |
362 | } | |
eea7556c | 363 | health_unregister(health_relayd); |
d3e2ba59 JD |
364 | DBG("Live viewer listener thread cleanup complete"); |
365 | stop_threads(); | |
366 | return NULL; | |
367 | } | |
368 | ||
369 | /* | |
370 | * This thread manages the dispatching of the requests to worker threads | |
371 | */ | |
372 | static | |
373 | void *thread_dispatcher(void *data) | |
374 | { | |
6cd525e8 MD |
375 | int err = -1; |
376 | ssize_t ret; | |
d3e2ba59 JD |
377 | struct cds_wfq_node *node; |
378 | struct relay_command *relay_cmd = NULL; | |
379 | ||
380 | DBG("[thread] Live viewer relay dispatcher started"); | |
381 | ||
eea7556c MD |
382 | health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_DISPATCHER); |
383 | ||
9b5e0863 MD |
384 | if (testpoint(relayd_thread_live_dispatcher)) { |
385 | goto error_testpoint; | |
386 | } | |
387 | ||
eea7556c MD |
388 | health_code_update(); |
389 | ||
d3e2ba59 | 390 | while (!CMM_LOAD_SHARED(live_dispatch_thread_exit)) { |
eea7556c MD |
391 | health_code_update(); |
392 | ||
d3e2ba59 JD |
393 | /* Atomically prepare the queue futex */ |
394 | futex_nto1_prepare(&viewer_cmd_queue.futex); | |
395 | ||
396 | do { | |
eea7556c MD |
397 | health_code_update(); |
398 | ||
d3e2ba59 JD |
399 | /* Dequeue commands */ |
400 | node = cds_wfq_dequeue_blocking(&viewer_cmd_queue.queue); | |
401 | if (node == NULL) { | |
402 | DBG("Woken up but nothing in the live-viewer " | |
403 | "relay command queue"); | |
404 | /* Continue thread execution */ | |
405 | break; | |
406 | } | |
407 | ||
408 | relay_cmd = caa_container_of(node, struct relay_command, node); | |
409 | DBG("Dispatching viewer request waiting on sock %d", | |
410 | relay_cmd->sock->fd); | |
411 | ||
412 | /* | |
413 | * Inform worker thread of the new request. This call is blocking | |
414 | * so we can be assured that the data will be read at some point in | |
415 | * time or wait to the end of the world :) | |
416 | */ | |
6cd525e8 MD |
417 | ret = lttng_write(live_relay_cmd_pipe[1], relay_cmd, |
418 | sizeof(*relay_cmd)); | |
d3e2ba59 | 419 | free(relay_cmd); |
6cd525e8 | 420 | if (ret < sizeof(struct relay_command)) { |
d3e2ba59 JD |
421 | PERROR("write cmd pipe"); |
422 | goto error; | |
423 | } | |
424 | } while (node != NULL); | |
425 | ||
426 | /* Futex wait on queue. Blocking call on futex() */ | |
eea7556c | 427 | health_poll_entry(); |
d3e2ba59 | 428 | futex_nto1_wait(&viewer_cmd_queue.futex); |
eea7556c | 429 | health_poll_exit(); |
d3e2ba59 JD |
430 | } |
431 | ||
eea7556c MD |
432 | /* Normal exit, no error */ |
433 | err = 0; | |
434 | ||
d3e2ba59 | 435 | error: |
9b5e0863 | 436 | error_testpoint: |
eea7556c MD |
437 | if (err) { |
438 | health_error(); | |
439 | ERR("Health error occurred in %s", __func__); | |
440 | } | |
441 | health_unregister(health_relayd); | |
d3e2ba59 JD |
442 | DBG("Live viewer dispatch thread dying"); |
443 | stop_threads(); | |
444 | return NULL; | |
445 | } | |
446 | ||
447 | /* | |
448 | * Establish connection with the viewer and check the versions. | |
449 | * | |
450 | * Return 0 on success or else negative value. | |
451 | */ | |
452 | static | |
453 | int viewer_connect(struct relay_command *cmd) | |
454 | { | |
455 | int ret; | |
456 | struct lttng_viewer_connect reply, msg; | |
457 | ||
458 | assert(cmd); | |
459 | ||
460 | cmd->version_check_done = 1; | |
461 | ||
eea7556c MD |
462 | health_code_update(); |
463 | ||
d3e2ba59 JD |
464 | /* Get version from the other side. */ |
465 | ret = cmd->sock->ops->recvmsg(cmd->sock, &msg, sizeof(msg), 0); | |
466 | if (ret < 0 || ret != sizeof(msg)) { | |
467 | if (ret == 0) { | |
468 | /* Orderly shutdown. Not necessary to print an error. */ | |
469 | DBG("Socket %d did an orderly shutdown", cmd->sock->fd); | |
470 | } else { | |
471 | ERR("Relay failed to receive the version values."); | |
472 | } | |
473 | ret = -1; | |
474 | goto end; | |
475 | } | |
476 | ||
eea7556c MD |
477 | health_code_update(); |
478 | ||
d3e2ba59 JD |
479 | reply.major = RELAYD_VERSION_COMM_MAJOR; |
480 | reply.minor = RELAYD_VERSION_COMM_MINOR; | |
481 | ||
482 | /* Major versions must be the same */ | |
483 | if (reply.major != be32toh(msg.major)) { | |
484 | DBG("Incompatible major versions (%u vs %u)", reply.major, | |
485 | be32toh(msg.major)); | |
72180669 | 486 | ret = -1; |
d3e2ba59 JD |
487 | goto end; |
488 | } | |
489 | ||
490 | cmd->major = reply.major; | |
491 | /* We adapt to the lowest compatible version */ | |
492 | if (reply.minor <= be32toh(msg.minor)) { | |
493 | cmd->minor = reply.minor; | |
494 | } else { | |
495 | cmd->minor = be32toh(msg.minor); | |
496 | } | |
497 | ||
498 | if (be32toh(msg.type) == VIEWER_CLIENT_COMMAND) { | |
499 | cmd->type = RELAY_VIEWER_COMMAND; | |
500 | } else if (be32toh(msg.type) == VIEWER_CLIENT_NOTIFICATION) { | |
501 | cmd->type = RELAY_VIEWER_NOTIFICATION; | |
502 | } else { | |
503 | ERR("Unknown connection type : %u", be32toh(msg.type)); | |
504 | ret = -1; | |
505 | goto end; | |
506 | } | |
507 | ||
508 | reply.major = htobe32(reply.major); | |
509 | reply.minor = htobe32(reply.minor); | |
510 | if (cmd->type == RELAY_VIEWER_COMMAND) { | |
511 | reply.viewer_session_id = htobe64(++last_relay_viewer_session_id); | |
512 | } | |
eea7556c MD |
513 | |
514 | health_code_update(); | |
515 | ||
d3e2ba59 JD |
516 | ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, |
517 | sizeof(struct lttng_viewer_connect), 0); | |
518 | if (ret < 0) { | |
519 | ERR("Relay sending version"); | |
520 | } | |
521 | ||
eea7556c MD |
522 | health_code_update(); |
523 | ||
d3e2ba59 JD |
524 | DBG("Version check done using protocol %u.%u", cmd->major, cmd->minor); |
525 | ret = 0; | |
526 | ||
527 | end: | |
528 | return ret; | |
529 | } | |
530 | ||
531 | /* | |
532 | * Send the viewer the list of current sessions. | |
533 | * | |
534 | * Return 0 on success or else a negative value. | |
535 | */ | |
536 | static | |
537 | int viewer_list_sessions(struct relay_command *cmd, | |
538 | struct lttng_ht *sessions_ht) | |
539 | { | |
540 | int ret; | |
541 | struct lttng_viewer_list_sessions session_list; | |
542 | unsigned long count; | |
543 | long approx_before, approx_after; | |
544 | struct lttng_ht_node_ulong *node; | |
545 | struct lttng_ht_iter iter; | |
546 | struct lttng_viewer_session send_session; | |
547 | struct relay_session *session; | |
548 | ||
549 | DBG("List sessions received"); | |
550 | ||
551 | if (cmd->version_check_done == 0) { | |
552 | ERR("Trying to list sessions before version check"); | |
553 | ret = -1; | |
554 | goto end_no_session; | |
555 | } | |
556 | ||
557 | rcu_read_lock(); | |
558 | cds_lfht_count_nodes(sessions_ht->ht, &approx_before, &count, &approx_after); | |
559 | session_list.sessions_count = htobe32(count); | |
560 | ||
eea7556c MD |
561 | health_code_update(); |
562 | ||
d3e2ba59 JD |
563 | ret = cmd->sock->ops->sendmsg(cmd->sock, &session_list, |
564 | sizeof(session_list), 0); | |
565 | if (ret < 0) { | |
566 | ERR("Relay sending sessions list"); | |
567 | goto end_unlock; | |
568 | } | |
569 | ||
eea7556c MD |
570 | health_code_update(); |
571 | ||
d3e2ba59 | 572 | cds_lfht_for_each_entry(sessions_ht->ht, &iter.iter, node, node) { |
eea7556c MD |
573 | health_code_update(); |
574 | ||
d3e2ba59 JD |
575 | node = lttng_ht_iter_get_node_ulong(&iter); |
576 | if (!node) { | |
577 | goto end_unlock; | |
578 | } | |
579 | session = caa_container_of(node, struct relay_session, session_n); | |
580 | ||
581 | strncpy(send_session.session_name, session->session_name, | |
582 | sizeof(send_session.session_name)); | |
583 | strncpy(send_session.hostname, session->hostname, | |
584 | sizeof(send_session.hostname)); | |
585 | send_session.id = htobe64(session->id); | |
586 | send_session.live_timer = htobe32(session->live_timer); | |
587 | send_session.clients = htobe32(session->viewer_attached); | |
87b576ec | 588 | send_session.streams = htobe32(session->stream_count); |
d3e2ba59 | 589 | |
eea7556c MD |
590 | health_code_update(); |
591 | ||
d3e2ba59 JD |
592 | ret = cmd->sock->ops->sendmsg(cmd->sock, &send_session, |
593 | sizeof(send_session), 0); | |
594 | if (ret < 0) { | |
595 | ERR("Relay sending session info"); | |
596 | goto end_unlock; | |
597 | } | |
598 | } | |
eea7556c MD |
599 | health_code_update(); |
600 | ||
d3e2ba59 JD |
601 | rcu_read_unlock(); |
602 | ret = 0; | |
603 | goto end; | |
604 | ||
605 | end_unlock: | |
606 | rcu_read_unlock(); | |
607 | ||
608 | end: | |
609 | end_no_session: | |
610 | return ret; | |
611 | } | |
612 | ||
0e6830aa JD |
613 | /* |
614 | * Open index file using a given viewer stream. | |
615 | * | |
616 | * Return 0 on success or else a negative value. | |
617 | */ | |
618 | static int open_index(struct relay_viewer_stream *stream) | |
619 | { | |
620 | int ret; | |
621 | char fullpath[PATH_MAX]; | |
50adc264 | 622 | struct ctf_packet_index_file_hdr hdr; |
0e6830aa | 623 | |
6b6b9a5a JD |
624 | if (stream->tracefile_count > 0) { |
625 | ret = snprintf(fullpath, sizeof(fullpath), "%s/" DEFAULT_INDEX_DIR "/%s_%" | |
626 | PRIu64 DEFAULT_INDEX_FILE_SUFFIX, stream->path_name, | |
627 | stream->channel_name, stream->tracefile_count_current); | |
628 | } else { | |
629 | ret = snprintf(fullpath, sizeof(fullpath), "%s/" DEFAULT_INDEX_DIR "/%s" | |
630 | DEFAULT_INDEX_FILE_SUFFIX, stream->path_name, | |
631 | stream->channel_name); | |
0e6830aa | 632 | } |
0e6830aa JD |
633 | if (ret < 0) { |
634 | PERROR("snprintf index path"); | |
635 | goto error; | |
636 | } | |
637 | ||
638 | DBG("Opening index file %s in read only", fullpath); | |
639 | ret = open(fullpath, O_RDONLY); | |
640 | if (ret < 0) { | |
641 | if (errno == ENOENT) { | |
642 | ret = -ENOENT; | |
643 | goto error; | |
644 | } else { | |
645 | PERROR("opening index in read-only"); | |
646 | } | |
647 | goto error; | |
648 | } | |
649 | stream->index_read_fd = ret; | |
650 | DBG("Opening index file %s in read only, (fd: %d)", fullpath, ret); | |
651 | ||
6cd525e8 MD |
652 | ret = lttng_read(stream->index_read_fd, &hdr, sizeof(hdr)); |
653 | if (ret < sizeof(hdr)) { | |
0e6830aa JD |
654 | PERROR("Reading index header"); |
655 | goto error; | |
656 | } | |
50adc264 | 657 | if (be32toh(hdr.magic) != CTF_INDEX_MAGIC) { |
0e6830aa JD |
658 | ERR("Invalid header magic"); |
659 | ret = -1; | |
660 | goto error; | |
661 | } | |
50adc264 JD |
662 | if (be32toh(hdr.index_major) != CTF_INDEX_MAJOR || |
663 | be32toh(hdr.index_minor) != CTF_INDEX_MINOR) { | |
0e6830aa JD |
664 | ERR("Invalid header version"); |
665 | ret = -1; | |
666 | goto error; | |
667 | } | |
668 | ret = 0; | |
669 | ||
670 | error: | |
0e6830aa JD |
671 | return ret; |
672 | } | |
673 | ||
d3e2ba59 JD |
674 | /* |
675 | * Allocate and init a new viewer_stream. | |
676 | * | |
677 | * Copies the values from the stream passed in parameter and insert the new | |
678 | * stream in the viewer_streams_ht. | |
679 | * | |
680 | * MUST be called with rcu_read_lock held. | |
681 | * | |
682 | * Returns 0 on success or a negative value on error. | |
683 | */ | |
684 | static | |
0e6830aa | 685 | int init_viewer_stream(struct relay_stream *stream, int seek_last) |
d3e2ba59 JD |
686 | { |
687 | int ret; | |
688 | struct relay_viewer_stream *viewer_stream; | |
689 | ||
690 | assert(stream); | |
d3e2ba59 JD |
691 | |
692 | viewer_stream = zmalloc(sizeof(*viewer_stream)); | |
693 | if (!viewer_stream) { | |
694 | PERROR("relay viewer stream zmalloc"); | |
695 | ret = -1; | |
696 | goto error; | |
697 | } | |
d3e2ba59 JD |
698 | viewer_stream->session_id = stream->session->id; |
699 | viewer_stream->stream_handle = stream->stream_handle; | |
700 | viewer_stream->path_name = strndup(stream->path_name, | |
701 | LTTNG_VIEWER_PATH_MAX); | |
702 | viewer_stream->channel_name = strndup(stream->channel_name, | |
703 | LTTNG_VIEWER_NAME_MAX); | |
d3e2ba59 JD |
704 | viewer_stream->tracefile_count = stream->tracefile_count; |
705 | viewer_stream->metadata_flag = stream->metadata_flag; | |
a020f610 | 706 | viewer_stream->tracefile_count_last = -1ULL; |
6b6b9a5a JD |
707 | if (seek_last) { |
708 | viewer_stream->tracefile_count_current = | |
709 | stream->tracefile_count_current; | |
710 | } else { | |
711 | viewer_stream->tracefile_count_current = | |
712 | stream->oldest_tracefile_id; | |
713 | } | |
714 | ||
6b6b9a5a | 715 | viewer_stream->ctf_trace = stream->ctf_trace; |
157df586 JD |
716 | if (viewer_stream->metadata_flag) { |
717 | viewer_stream->ctf_trace->viewer_metadata_stream = | |
718 | viewer_stream; | |
719 | } | |
6b6b9a5a | 720 | uatomic_inc(&viewer_stream->ctf_trace->refcount); |
d3e2ba59 | 721 | |
6b6b9a5a JD |
722 | lttng_ht_node_init_u64(&viewer_stream->stream_n, stream->stream_handle); |
723 | lttng_ht_add_unique_u64(viewer_streams_ht, &viewer_stream->stream_n); | |
724 | ||
725 | viewer_stream->index_read_fd = -1; | |
726 | viewer_stream->read_fd = -1; | |
727 | ||
728 | /* | |
729 | * This is to avoid a race between the initialization of this object and | |
730 | * the close of the given stream. If the stream is unable to find this | |
731 | * viewer stream when closing, this copy will at least take the latest | |
732 | * value. | |
733 | * We also need that for the seek_last. | |
734 | */ | |
735 | viewer_stream->total_index_received = stream->total_index_received; | |
736 | ||
737 | /* | |
738 | * If we never received an index for the current stream, delay | |
739 | * the opening of the index, otherwise open it right now. | |
740 | */ | |
741 | if (viewer_stream->tracefile_count_current == | |
742 | stream->tracefile_count_current && | |
743 | viewer_stream->total_index_received == 0) { | |
744 | viewer_stream->index_read_fd = -1; | |
745 | } else { | |
0e6830aa JD |
746 | ret = open_index(viewer_stream); |
747 | if (ret < 0) { | |
748 | goto error; | |
749 | } | |
6b6b9a5a JD |
750 | } |
751 | ||
752 | if (seek_last && viewer_stream->index_read_fd > 0) { | |
0e6830aa JD |
753 | ret = lseek(viewer_stream->index_read_fd, |
754 | viewer_stream->total_index_received * | |
50adc264 | 755 | sizeof(struct ctf_packet_index), |
0e6830aa JD |
756 | SEEK_CUR); |
757 | if (ret < 0) { | |
758 | goto error; | |
759 | } | |
760 | viewer_stream->last_sent_index = | |
761 | viewer_stream->total_index_received; | |
762 | } | |
763 | ||
6b6b9a5a JD |
764 | ret = 0; |
765 | ||
766 | error: | |
767 | return ret; | |
768 | } | |
769 | ||
770 | /* | |
771 | * Rotate a stream to the next tracefile. | |
772 | * | |
a020f610 | 773 | * Returns 0 on success, 1 on EOF, a negative value on error. |
6b6b9a5a JD |
774 | */ |
775 | static | |
776 | int rotate_viewer_stream(struct relay_viewer_stream *viewer_stream, | |
777 | struct relay_stream *stream) | |
778 | { | |
779 | int ret; | |
780 | uint64_t tracefile_id; | |
781 | ||
782 | assert(viewer_stream); | |
783 | ||
784 | tracefile_id = (viewer_stream->tracefile_count_current + 1) % | |
785 | viewer_stream->tracefile_count; | |
a020f610 JD |
786 | /* |
787 | * Detect the last tracefile to open. | |
788 | */ | |
789 | if (viewer_stream->tracefile_count_last != -1ULL && | |
790 | viewer_stream->tracefile_count_last == | |
791 | viewer_stream->tracefile_count_current) { | |
792 | ret = 1; | |
793 | goto end; | |
794 | } | |
d3e2ba59 | 795 | |
6b6b9a5a JD |
796 | if (stream) { |
797 | pthread_mutex_lock(&stream->viewer_stream_rotation_lock); | |
798 | } | |
d3e2ba59 | 799 | /* |
6b6b9a5a JD |
800 | * The writer and the reader are not working in the same |
801 | * tracefile, we can read up to EOF, we don't care about the | |
802 | * total_index_received. | |
d3e2ba59 | 803 | */ |
6b6b9a5a JD |
804 | if (!stream || (stream->tracefile_count_current != tracefile_id)) { |
805 | viewer_stream->close_write_flag = 1; | |
806 | } else { | |
807 | /* | |
808 | * We are opening a file that is still open in write, make | |
809 | * sure we limit our reading to the number of indexes | |
810 | * received. | |
811 | */ | |
812 | viewer_stream->close_write_flag = 0; | |
813 | if (stream) { | |
814 | viewer_stream->total_index_received = | |
815 | stream->total_index_received; | |
816 | } | |
817 | } | |
818 | viewer_stream->tracefile_count_current = tracefile_id; | |
d3e2ba59 | 819 | |
d1d66061 JD |
820 | ret = close(viewer_stream->index_read_fd); |
821 | if (ret < 0) { | |
822 | PERROR("close index file %d", | |
823 | viewer_stream->index_read_fd); | |
6b6b9a5a | 824 | } |
d1d66061 JD |
825 | viewer_stream->index_read_fd = -1; |
826 | ret = close(viewer_stream->read_fd); | |
827 | if (ret < 0) { | |
828 | PERROR("close tracefile %d", | |
829 | viewer_stream->read_fd); | |
830 | } | |
831 | viewer_stream->read_fd = -1; | |
832 | ||
833 | pthread_mutex_lock(&viewer_stream->overwrite_lock); | |
834 | viewer_stream->abort_flag = 0; | |
835 | pthread_mutex_unlock(&viewer_stream->overwrite_lock); | |
6b6b9a5a | 836 | |
cef0f7d5 | 837 | viewer_stream->index_read_fd = -1; |
6b6b9a5a JD |
838 | viewer_stream->read_fd = -1; |
839 | ||
cef0f7d5 JD |
840 | if (stream) { |
841 | pthread_mutex_unlock(&stream->viewer_stream_rotation_lock); | |
842 | } | |
6b6b9a5a JD |
843 | ret = open_index(viewer_stream); |
844 | if (ret < 0) { | |
845 | goto error; | |
846 | } | |
d3e2ba59 JD |
847 | |
848 | ret = 0; | |
849 | ||
a020f610 | 850 | end: |
d3e2ba59 JD |
851 | error: |
852 | return ret; | |
853 | } | |
854 | ||
855 | /* | |
856 | * Send the viewer the list of current sessions. | |
857 | */ | |
858 | static | |
859 | int viewer_attach_session(struct relay_command *cmd, | |
92c6ca54 | 860 | struct lttng_ht *sessions_ht) |
d3e2ba59 | 861 | { |
a4baae1b JD |
862 | int ret, send_streams = 0; |
863 | uint32_t nb_streams = 0, nb_streams_ready = 0; | |
d3e2ba59 JD |
864 | struct lttng_viewer_attach_session_request request; |
865 | struct lttng_viewer_attach_session_response response; | |
866 | struct lttng_viewer_stream send_stream; | |
867 | struct relay_stream *stream; | |
868 | struct relay_viewer_stream *viewer_stream; | |
869 | struct lttng_ht_node_ulong *node; | |
870 | struct lttng_ht_node_u64 *node64; | |
871 | struct lttng_ht_iter iter; | |
872 | struct relay_session *session; | |
0e6830aa | 873 | int seek_last = 0; |
d3e2ba59 JD |
874 | |
875 | assert(cmd); | |
876 | assert(sessions_ht); | |
d3e2ba59 JD |
877 | |
878 | DBG("Attach session received"); | |
879 | ||
880 | if (cmd->version_check_done == 0) { | |
881 | ERR("Trying to attach session before version check"); | |
882 | ret = -1; | |
883 | goto end_no_session; | |
884 | } | |
885 | ||
eea7556c MD |
886 | health_code_update(); |
887 | ||
d3e2ba59 JD |
888 | ret = cmd->sock->ops->recvmsg(cmd->sock, &request, sizeof(request), 0); |
889 | if (ret < 0 || ret != sizeof(request)) { | |
890 | if (ret == 0) { | |
891 | /* Orderly shutdown. Not necessary to print an error. */ | |
892 | DBG("Socket %d did an orderly shutdown", cmd->sock->fd); | |
893 | } else { | |
894 | ERR("Relay failed to receive the attach parameters."); | |
895 | } | |
896 | ret = -1; | |
897 | goto error; | |
898 | } | |
899 | ||
eea7556c MD |
900 | health_code_update(); |
901 | ||
d3e2ba59 JD |
902 | rcu_read_lock(); |
903 | lttng_ht_lookup(sessions_ht, | |
904 | (void *)((unsigned long) be64toh(request.session_id)), &iter); | |
905 | node = lttng_ht_iter_get_node_ulong(&iter); | |
906 | if (node == NULL) { | |
907 | DBG("Relay session %" PRIu64 " not found", | |
908 | be64toh(request.session_id)); | |
909 | response.status = htobe32(VIEWER_ATTACH_UNK); | |
910 | goto send_reply; | |
911 | } | |
912 | ||
913 | session = caa_container_of(node, struct relay_session, session_n); | |
b92fdc2b | 914 | if (cmd->session_id == session->id) { |
d3e2ba59 JD |
915 | /* Same viewer already attached, just send the stream list. */ |
916 | send_streams = 1; | |
917 | response.status = htobe32(VIEWER_ATTACH_OK); | |
918 | } else if (session->viewer_attached != 0) { | |
919 | DBG("Already a viewer attached"); | |
920 | response.status = htobe32(VIEWER_ATTACH_ALREADY); | |
921 | goto send_reply; | |
922 | } else if (session->live_timer == 0) { | |
923 | DBG("Not live session"); | |
924 | response.status = htobe32(VIEWER_ATTACH_NOT_LIVE); | |
925 | goto send_reply; | |
926 | } else { | |
927 | session->viewer_attached++; | |
928 | send_streams = 1; | |
929 | response.status = htobe32(VIEWER_ATTACH_OK); | |
b92fdc2b | 930 | cmd->session_id = session->id; |
d3e2ba59 JD |
931 | cmd->session = session; |
932 | } | |
933 | ||
934 | switch (be32toh(request.seek)) { | |
935 | case VIEWER_SEEK_BEGINNING: | |
936 | /* Default behaviour. */ | |
937 | break; | |
938 | case VIEWER_SEEK_LAST: | |
0e6830aa | 939 | seek_last = 1; |
d3e2ba59 JD |
940 | break; |
941 | default: | |
942 | ERR("Wrong seek parameter"); | |
943 | response.status = htobe32(VIEWER_ATTACH_SEEK_ERR); | |
944 | send_streams = 0; | |
945 | goto send_reply; | |
946 | } | |
947 | ||
948 | if (send_streams) { | |
949 | /* We should only be there if we have a session to attach to. */ | |
950 | assert(session); | |
951 | ||
952 | /* | |
953 | * Fill the viewer_streams_ht to count the number of streams | |
954 | * ready to be sent and avoid concurrency issues on the | |
955 | * relay_streams_ht and don't rely on a total session stream count. | |
956 | */ | |
957 | cds_lfht_for_each_entry(relay_streams_ht->ht, &iter.iter, node, node) { | |
958 | struct relay_viewer_stream *vstream; | |
959 | ||
eea7556c MD |
960 | health_code_update(); |
961 | ||
d3e2ba59 JD |
962 | node = lttng_ht_iter_get_node_ulong(&iter); |
963 | if (!node) { | |
964 | continue; | |
965 | } | |
966 | stream = caa_container_of(node, struct relay_stream, stream_n); | |
967 | if (stream->session != cmd->session) { | |
968 | continue; | |
969 | } | |
a4baae1b | 970 | nb_streams++; |
d3e2ba59 JD |
971 | |
972 | /* | |
a4baae1b JD |
973 | * Don't send streams with no ctf_trace, they are not |
974 | * ready to be read. | |
d3e2ba59 | 975 | */ |
a4baae1b | 976 | if (!stream->ctf_trace || !stream->viewer_ready) { |
d3e2ba59 JD |
977 | continue; |
978 | } | |
a4baae1b | 979 | nb_streams_ready++; |
d3e2ba59 | 980 | |
92c6ca54 | 981 | vstream = live_find_viewer_stream_by_id(stream->stream_handle); |
d3e2ba59 | 982 | if (!vstream) { |
0e6830aa | 983 | ret = init_viewer_stream(stream, seek_last); |
d3e2ba59 JD |
984 | if (ret < 0) { |
985 | goto end_unlock; | |
986 | } | |
987 | } | |
a4baae1b JD |
988 | } |
989 | ||
990 | /* We must have the same amount of existing stream and ready stream. */ | |
991 | if (nb_streams != nb_streams_ready) { | |
992 | nb_streams = 0; | |
d3e2ba59 JD |
993 | } |
994 | response.streams_count = htobe32(nb_streams); | |
995 | } | |
996 | ||
997 | send_reply: | |
eea7556c | 998 | health_code_update(); |
d3e2ba59 JD |
999 | ret = cmd->sock->ops->sendmsg(cmd->sock, &response, sizeof(response), 0); |
1000 | if (ret < 0) { | |
1001 | ERR("Relay sending viewer attach response"); | |
1002 | goto end_unlock; | |
1003 | } | |
eea7556c | 1004 | health_code_update(); |
d3e2ba59 JD |
1005 | |
1006 | /* | |
157df586 | 1007 | * Unknown or empty session, just return gracefully, the viewer knows what |
d3e2ba59 JD |
1008 | * is happening. |
1009 | */ | |
157df586 | 1010 | if (!send_streams || !nb_streams) { |
d3e2ba59 JD |
1011 | ret = 0; |
1012 | goto end_unlock; | |
1013 | } | |
1014 | ||
1015 | /* We should only be there if we have a session to attach to. */ | |
1016 | assert(session); | |
1017 | cds_lfht_for_each_entry(viewer_streams_ht->ht, &iter.iter, node, node) { | |
eea7556c MD |
1018 | health_code_update(); |
1019 | ||
d3e2ba59 JD |
1020 | node64 = lttng_ht_iter_get_node_u64(&iter); |
1021 | if (!node64) { | |
1022 | continue; | |
1023 | } | |
1024 | viewer_stream = caa_container_of(node64, struct relay_viewer_stream, | |
1025 | stream_n); | |
1026 | if (viewer_stream->session_id != cmd->session->id) { | |
1027 | continue; | |
1028 | } | |
1029 | ||
1030 | send_stream.id = htobe64(viewer_stream->stream_handle); | |
1031 | send_stream.ctf_trace_id = htobe64(viewer_stream->ctf_trace->id); | |
1032 | send_stream.metadata_flag = htobe32(viewer_stream->metadata_flag); | |
1033 | strncpy(send_stream.path_name, viewer_stream->path_name, | |
1034 | sizeof(send_stream.path_name)); | |
1035 | strncpy(send_stream.channel_name, viewer_stream->channel_name, | |
1036 | sizeof(send_stream.channel_name)); | |
1037 | ||
1038 | ret = cmd->sock->ops->sendmsg(cmd->sock, &send_stream, | |
1039 | sizeof(send_stream), 0); | |
1040 | if (ret < 0) { | |
1041 | ERR("Relay sending stream %" PRIu64, viewer_stream->stream_handle); | |
1042 | goto end_unlock; | |
1043 | } | |
1044 | DBG("Sent stream %" PRIu64 " to viewer", viewer_stream->stream_handle); | |
1045 | } | |
1046 | ret = 0; | |
1047 | ||
1048 | end_unlock: | |
1049 | rcu_read_unlock(); | |
1050 | end_no_session: | |
1051 | error: | |
1052 | return ret; | |
1053 | } | |
1054 | ||
d3e2ba59 JD |
1055 | /* |
1056 | * Get viewer stream from stream id. | |
1057 | * | |
1058 | * RCU read side lock MUST be acquired. | |
1059 | */ | |
92c6ca54 | 1060 | struct relay_viewer_stream *live_find_viewer_stream_by_id(uint64_t stream_id) |
d3e2ba59 JD |
1061 | { |
1062 | struct lttng_ht_node_u64 *node; | |
1063 | struct lttng_ht_iter iter; | |
1064 | struct relay_viewer_stream *stream = NULL; | |
1065 | ||
d3e2ba59 JD |
1066 | lttng_ht_lookup(viewer_streams_ht, &stream_id, &iter); |
1067 | node = lttng_ht_iter_get_node_u64(&iter); | |
1068 | if (node == NULL) { | |
1069 | DBG("Relay viewer stream %" PRIu64 " not found", stream_id); | |
1070 | goto end; | |
1071 | } | |
1072 | stream = caa_container_of(node, struct relay_viewer_stream, stream_n); | |
1073 | ||
1074 | end: | |
1075 | return stream; | |
1076 | } | |
1077 | ||
157df586 JD |
1078 | static |
1079 | void deferred_free_viewer_stream(struct rcu_head *head) | |
1080 | { | |
1081 | struct relay_viewer_stream *stream = | |
1082 | caa_container_of(head, struct relay_viewer_stream, rcu_node); | |
1083 | ||
1084 | free(stream->path_name); | |
1085 | free(stream->channel_name); | |
1086 | free(stream); | |
1087 | } | |
1088 | ||
1089 | static | |
1090 | void delete_viewer_stream(struct relay_viewer_stream *vstream) | |
1091 | { | |
1092 | int delret; | |
1093 | struct lttng_ht_iter iter; | |
1094 | ||
1095 | iter.iter.node = &vstream->stream_n.node; | |
1096 | delret = lttng_ht_del(viewer_streams_ht, &iter); | |
1097 | assert(!delret); | |
1098 | } | |
1099 | ||
1100 | static | |
1101 | void destroy_viewer_stream(struct relay_viewer_stream *vstream) | |
1102 | { | |
1103 | unsigned long ret_ref; | |
1104 | int ret; | |
1105 | ||
1106 | assert(vstream); | |
1107 | ret_ref = uatomic_add_return(&vstream->ctf_trace->refcount, -1); | |
1108 | assert(ret_ref >= 0); | |
1109 | ||
1110 | if (vstream->read_fd >= 0) { | |
1111 | ret = close(vstream->read_fd); | |
1112 | if (ret < 0) { | |
1113 | PERROR("close read_fd"); | |
1114 | } | |
1115 | } | |
1116 | if (vstream->index_read_fd >= 0) { | |
1117 | ret = close(vstream->index_read_fd); | |
1118 | if (ret < 0) { | |
1119 | PERROR("close index_read_fd"); | |
1120 | } | |
1121 | } | |
1122 | ||
1123 | /* | |
1124 | * If the only stream left in the HT is the metadata stream, | |
1125 | * we need to remove it because we won't detect a EOF for this | |
1126 | * stream. | |
1127 | */ | |
efe12ccc | 1128 | if (ret_ref == 1 && vstream->ctf_trace->viewer_metadata_stream) { |
26f003c3 | 1129 | delete_viewer_stream(vstream->ctf_trace->viewer_metadata_stream); |
157df586 JD |
1130 | destroy_viewer_stream(vstream->ctf_trace->viewer_metadata_stream); |
1131 | vstream->ctf_trace->metadata_stream = NULL; | |
1132 | DBG("Freeing ctf_trace %" PRIu64, vstream->ctf_trace->id); | |
1133 | /* | |
1134 | * The streaming-side is already closed and we can't receive a new | |
1135 | * stream concurrently at this point (since the session is being | |
1136 | * destroyed), so when we detect the refcount equals 0, we are the | |
1137 | * only owners of the ctf_trace and we can free it ourself. | |
1138 | */ | |
1139 | free(vstream->ctf_trace); | |
1140 | } | |
1141 | ||
1142 | call_rcu(&vstream->rcu_node, deferred_free_viewer_stream); | |
1143 | } | |
1144 | ||
d3e2ba59 JD |
1145 | /* |
1146 | * Send the next index for a stream. | |
1147 | * | |
1148 | * Return 0 on success or else a negative value. | |
1149 | */ | |
1150 | static | |
1151 | int viewer_get_next_index(struct relay_command *cmd, | |
92c6ca54 | 1152 | struct lttng_ht *sessions_ht) |
d3e2ba59 JD |
1153 | { |
1154 | int ret; | |
1155 | struct lttng_viewer_get_next_index request_index; | |
1156 | struct lttng_viewer_index viewer_index; | |
50adc264 | 1157 | struct ctf_packet_index packet_index; |
d3e2ba59 JD |
1158 | struct relay_viewer_stream *vstream; |
1159 | struct relay_stream *rstream; | |
1160 | ||
1161 | assert(cmd); | |
d3e2ba59 JD |
1162 | assert(sessions_ht); |
1163 | ||
1164 | DBG("Viewer get next index"); | |
1165 | ||
1166 | if (cmd->version_check_done == 0) { | |
1167 | ERR("Trying to request index before version check"); | |
1168 | ret = -1; | |
1169 | goto end_no_session; | |
1170 | } | |
1171 | ||
eea7556c | 1172 | health_code_update(); |
d3e2ba59 JD |
1173 | ret = cmd->sock->ops->recvmsg(cmd->sock, &request_index, |
1174 | sizeof(request_index), 0); | |
1175 | if (ret < 0 || ret != sizeof(request_index)) { | |
1176 | ret = -1; | |
1177 | ERR("Relay didn't receive the whole packet"); | |
1178 | goto end; | |
1179 | } | |
eea7556c | 1180 | health_code_update(); |
d3e2ba59 JD |
1181 | |
1182 | rcu_read_lock(); | |
92c6ca54 | 1183 | vstream = live_find_viewer_stream_by_id(be64toh(request_index.stream_id)); |
d3e2ba59 JD |
1184 | if (!vstream) { |
1185 | ret = -1; | |
1186 | goto end_unlock; | |
1187 | } | |
1188 | ||
1189 | memset(&viewer_index, 0, sizeof(viewer_index)); | |
1190 | ||
1191 | /* | |
1192 | * The viewer should not ask for index on metadata stream. | |
1193 | */ | |
1194 | if (vstream->metadata_flag) { | |
1195 | viewer_index.status = htobe32(VIEWER_INDEX_HUP); | |
1196 | goto send_reply; | |
1197 | } | |
1198 | ||
1199 | /* First time, we open the index file */ | |
1200 | if (vstream->index_read_fd < 0) { | |
1201 | ret = open_index(vstream); | |
0e6830aa | 1202 | if (ret == -ENOENT) { |
d3e2ba59 JD |
1203 | /* |
1204 | * The index is created only when the first data packet arrives, it | |
1205 | * might not be ready at the beginning of the session | |
1206 | */ | |
1207 | viewer_index.status = htobe32(VIEWER_INDEX_RETRY); | |
1208 | goto send_reply; | |
1209 | } else if (ret < 0) { | |
1210 | viewer_index.status = htobe32(VIEWER_INDEX_ERR); | |
1211 | goto send_reply; | |
1212 | } | |
1213 | } | |
1214 | ||
1215 | rstream = relay_stream_find_by_id(vstream->stream_handle); | |
1216 | if (rstream) { | |
6b6b9a5a JD |
1217 | if (vstream->abort_flag) { |
1218 | /* Rotate on abort (overwrite). */ | |
1219 | DBG("Viewer rotate because of overwrite"); | |
1220 | ret = rotate_viewer_stream(vstream, rstream); | |
1221 | if (ret < 0) { | |
1222 | goto end_unlock; | |
a020f610 JD |
1223 | } else if (ret == 1) { |
1224 | viewer_index.status = htobe32(VIEWER_INDEX_HUP); | |
157df586 JD |
1225 | delete_viewer_stream(vstream); |
1226 | destroy_viewer_stream(vstream); | |
a020f610 | 1227 | goto send_reply; |
6b6b9a5a JD |
1228 | } |
1229 | } | |
6b6b9a5a | 1230 | pthread_mutex_lock(&rstream->viewer_stream_rotation_lock); |
cef0f7d5 JD |
1231 | if (rstream->tracefile_count_current == vstream->tracefile_count_current) { |
1232 | if (rstream->beacon_ts_end != -1ULL && | |
1233 | vstream->last_sent_index == rstream->total_index_received) { | |
1234 | viewer_index.status = htobe32(VIEWER_INDEX_INACTIVE); | |
1235 | viewer_index.timestamp_end = htobe64(rstream->beacon_ts_end); | |
1236 | pthread_mutex_unlock(&rstream->viewer_stream_rotation_lock); | |
1237 | goto send_reply; | |
1238 | /* | |
1239 | * Reader and writer are working in the same tracefile, so we care | |
1240 | * about the number of index received and sent. Otherwise, we read | |
1241 | * up to EOF. | |
1242 | */ | |
1243 | } else if (rstream->total_index_received <= vstream->last_sent_index | |
1244 | && !vstream->close_write_flag) { | |
1245 | pthread_mutex_unlock(&rstream->viewer_stream_rotation_lock); | |
1246 | /* No new index to send, retry later. */ | |
1247 | viewer_index.status = htobe32(VIEWER_INDEX_RETRY); | |
1248 | goto send_reply; | |
1249 | } | |
d3e2ba59 | 1250 | } |
6b6b9a5a JD |
1251 | pthread_mutex_unlock(&rstream->viewer_stream_rotation_lock); |
1252 | } else if (!rstream && vstream->close_write_flag && | |
d3e2ba59 | 1253 | vstream->total_index_received == vstream->last_sent_index) { |
6b6b9a5a | 1254 | /* Last index sent and current tracefile closed in write */ |
d3e2ba59 | 1255 | viewer_index.status = htobe32(VIEWER_INDEX_HUP); |
157df586 JD |
1256 | delete_viewer_stream(vstream); |
1257 | destroy_viewer_stream(vstream); | |
d3e2ba59 | 1258 | goto send_reply; |
6b6b9a5a JD |
1259 | } else { |
1260 | vstream->close_write_flag = 1; | |
d3e2ba59 JD |
1261 | } |
1262 | ||
1263 | if (!vstream->ctf_trace->metadata_received || | |
1264 | vstream->ctf_trace->metadata_received > | |
1265 | vstream->ctf_trace->metadata_sent) { | |
1266 | viewer_index.flags |= LTTNG_VIEWER_FLAG_NEW_METADATA; | |
1267 | } | |
1268 | ||
cef0f7d5 JD |
1269 | pthread_mutex_lock(&vstream->overwrite_lock); |
1270 | if (vstream->abort_flag) { | |
1271 | /* | |
1272 | * The file is being overwritten by the writer, we cannot | |
1273 | * use it. | |
1274 | */ | |
1275 | viewer_index.status = htobe32(VIEWER_INDEX_RETRY); | |
1276 | pthread_mutex_unlock(&vstream->overwrite_lock); | |
1277 | ret = rotate_viewer_stream(vstream, rstream); | |
1278 | if (ret < 0) { | |
1279 | goto end_unlock; | |
a020f610 JD |
1280 | } else if (ret == 1) { |
1281 | viewer_index.status = htobe32(VIEWER_INDEX_HUP); | |
157df586 JD |
1282 | delete_viewer_stream(vstream); |
1283 | destroy_viewer_stream(vstream); | |
a020f610 | 1284 | goto send_reply; |
cef0f7d5 JD |
1285 | } |
1286 | goto send_reply; | |
1287 | } | |
6cd525e8 MD |
1288 | ret = lttng_read(vstream->index_read_fd, &packet_index, |
1289 | sizeof(packet_index)); | |
cef0f7d5 | 1290 | pthread_mutex_unlock(&vstream->overwrite_lock); |
d3e2ba59 | 1291 | if (ret < sizeof(packet_index)) { |
6b6b9a5a JD |
1292 | /* |
1293 | * The tracefile is closed in write, so we read up to EOF. | |
1294 | */ | |
1295 | if (vstream->close_write_flag == 1) { | |
1296 | viewer_index.status = htobe32(VIEWER_INDEX_RETRY); | |
1297 | /* Rotate on normal EOF */ | |
1298 | ret = rotate_viewer_stream(vstream, rstream); | |
1299 | if (ret < 0) { | |
1300 | goto end_unlock; | |
a020f610 JD |
1301 | } else if (ret == 1) { |
1302 | viewer_index.status = htobe32(VIEWER_INDEX_HUP); | |
157df586 JD |
1303 | delete_viewer_stream(vstream); |
1304 | destroy_viewer_stream(vstream); | |
a020f610 | 1305 | goto send_reply; |
6b6b9a5a JD |
1306 | } |
1307 | } else { | |
cef0f7d5 JD |
1308 | PERROR("Relay reading index file %d", |
1309 | vstream->index_read_fd); | |
1310 | viewer_index.status = htobe32(VIEWER_INDEX_ERR); | |
6b6b9a5a JD |
1311 | } |
1312 | goto send_reply; | |
d3e2ba59 JD |
1313 | } else { |
1314 | viewer_index.status = htobe32(VIEWER_INDEX_OK); | |
1315 | vstream->last_sent_index++; | |
1316 | } | |
1317 | ||
1318 | /* | |
1319 | * Indexes are stored in big endian, no need to switch before sending. | |
1320 | */ | |
1321 | viewer_index.offset = packet_index.offset; | |
1322 | viewer_index.packet_size = packet_index.packet_size; | |
1323 | viewer_index.content_size = packet_index.content_size; | |
1324 | viewer_index.timestamp_begin = packet_index.timestamp_begin; | |
1325 | viewer_index.timestamp_end = packet_index.timestamp_end; | |
1326 | viewer_index.events_discarded = packet_index.events_discarded; | |
1327 | viewer_index.stream_id = packet_index.stream_id; | |
1328 | ||
1329 | send_reply: | |
1330 | viewer_index.flags = htobe32(viewer_index.flags); | |
eea7556c | 1331 | health_code_update(); |
d3e2ba59 JD |
1332 | ret = cmd->sock->ops->sendmsg(cmd->sock, &viewer_index, |
1333 | sizeof(viewer_index), 0); | |
1334 | if (ret < 0) { | |
1335 | ERR("Relay index to viewer"); | |
1336 | goto end_unlock; | |
1337 | } | |
eea7556c | 1338 | health_code_update(); |
d3e2ba59 JD |
1339 | |
1340 | DBG("Index %" PRIu64 "for stream %" PRIu64 "sent", | |
1341 | vstream->last_sent_index, vstream->stream_handle); | |
1342 | ||
1343 | end_unlock: | |
1344 | rcu_read_unlock(); | |
1345 | ||
1346 | end_no_session: | |
1347 | end: | |
1348 | return ret; | |
1349 | } | |
1350 | ||
1351 | /* | |
1352 | * Send the next index for a stream | |
1353 | * | |
1354 | * Return 0 on success or else a negative value. | |
1355 | */ | |
1356 | static | |
92c6ca54 | 1357 | int viewer_get_packet(struct relay_command *cmd) |
d3e2ba59 JD |
1358 | { |
1359 | int ret, send_data = 0; | |
1360 | char *data = NULL; | |
1361 | uint32_t len = 0; | |
1362 | ssize_t read_len; | |
1363 | struct lttng_viewer_get_packet get_packet_info; | |
1364 | struct lttng_viewer_trace_packet reply; | |
1365 | struct relay_viewer_stream *stream; | |
1366 | ||
1367 | assert(cmd); | |
d3e2ba59 JD |
1368 | |
1369 | DBG2("Relay get data packet"); | |
1370 | ||
1371 | if (cmd->version_check_done == 0) { | |
1372 | ERR("Trying to get packet before version check"); | |
1373 | ret = -1; | |
1374 | goto end; | |
1375 | } | |
1376 | ||
eea7556c | 1377 | health_code_update(); |
d3e2ba59 JD |
1378 | ret = cmd->sock->ops->recvmsg(cmd->sock, &get_packet_info, |
1379 | sizeof(get_packet_info), 0); | |
1380 | if (ret < 0 || ret != sizeof(get_packet_info)) { | |
1381 | ret = -1; | |
1382 | ERR("Relay didn't receive the whole packet"); | |
1383 | goto end; | |
1384 | } | |
eea7556c | 1385 | health_code_update(); |
d3e2ba59 | 1386 | |
0233a6a5 DG |
1387 | /* From this point on, the error label can be reached. */ |
1388 | memset(&reply, 0, sizeof(reply)); | |
1389 | ||
d3e2ba59 | 1390 | rcu_read_lock(); |
92c6ca54 | 1391 | stream = live_find_viewer_stream_by_id(be64toh(get_packet_info.stream_id)); |
d3e2ba59 JD |
1392 | if (!stream) { |
1393 | goto error; | |
1394 | } | |
1395 | assert(stream->ctf_trace); | |
1396 | ||
1397 | /* | |
1398 | * First time we read this stream, we need open the tracefile, we should | |
1399 | * only arrive here if an index has already been sent to the viewer, so the | |
1400 | * tracefile must exist, if it does not it is a fatal error. | |
1401 | */ | |
1402 | if (stream->read_fd < 0) { | |
1403 | char fullpath[PATH_MAX]; | |
1404 | ||
6b6b9a5a JD |
1405 | if (stream->tracefile_count > 0) { |
1406 | ret = snprintf(fullpath, PATH_MAX, "%s/%s_%" PRIu64, stream->path_name, | |
1407 | stream->channel_name, | |
1408 | stream->tracefile_count_current); | |
1409 | } else { | |
1410 | ret = snprintf(fullpath, PATH_MAX, "%s/%s", stream->path_name, | |
1411 | stream->channel_name); | |
1412 | } | |
d3e2ba59 JD |
1413 | if (ret < 0) { |
1414 | goto error; | |
1415 | } | |
1416 | ret = open(fullpath, O_RDONLY); | |
1417 | if (ret < 0) { | |
1418 | PERROR("Relay opening trace file"); | |
1419 | goto error; | |
1420 | } | |
1421 | stream->read_fd = ret; | |
1422 | } | |
1423 | ||
d3e2ba59 JD |
1424 | if (!stream->ctf_trace->metadata_received || |
1425 | stream->ctf_trace->metadata_received > | |
1426 | stream->ctf_trace->metadata_sent) { | |
1427 | reply.status = htobe32(VIEWER_GET_PACKET_ERR); | |
1428 | reply.flags |= LTTNG_VIEWER_FLAG_NEW_METADATA; | |
d3e2ba59 JD |
1429 | goto send_reply; |
1430 | } | |
1431 | ||
1432 | len = be32toh(get_packet_info.len); | |
1433 | data = zmalloc(len); | |
1434 | if (!data) { | |
1435 | PERROR("relay data zmalloc"); | |
1436 | goto error; | |
1437 | } | |
1438 | ||
1439 | ret = lseek(stream->read_fd, be64toh(get_packet_info.offset), SEEK_SET); | |
1440 | if (ret < 0) { | |
6b6b9a5a JD |
1441 | /* |
1442 | * If the read fd was closed by the streaming side, the | |
1443 | * abort_flag will be set to 1, otherwise it is an error. | |
1444 | */ | |
1445 | if (stream->abort_flag == 0) { | |
1446 | PERROR("lseek"); | |
1447 | goto error; | |
1448 | } | |
1449 | reply.status = htobe32(VIEWER_GET_PACKET_EOF); | |
1450 | goto send_reply; | |
d3e2ba59 | 1451 | } |
6cd525e8 MD |
1452 | read_len = lttng_read(stream->read_fd, data, len); |
1453 | if (read_len < len) { | |
6b6b9a5a JD |
1454 | /* |
1455 | * If the read fd was closed by the streaming side, the | |
1456 | * abort_flag will be set to 1, otherwise it is an error. | |
1457 | */ | |
1458 | if (stream->abort_flag == 0) { | |
1459 | PERROR("Relay reading trace file, fd: %d, offset: %" PRIu64, | |
1460 | stream->read_fd, | |
1461 | be64toh(get_packet_info.offset)); | |
1462 | goto error; | |
1463 | } else { | |
1464 | reply.status = htobe32(VIEWER_GET_PACKET_EOF); | |
1465 | goto send_reply; | |
1466 | } | |
d3e2ba59 JD |
1467 | } |
1468 | reply.status = htobe32(VIEWER_GET_PACKET_OK); | |
1469 | reply.len = htobe32(len); | |
1470 | send_data = 1; | |
1471 | goto send_reply; | |
1472 | ||
1473 | error: | |
1474 | reply.status = htobe32(VIEWER_GET_PACKET_ERR); | |
1475 | ||
1476 | send_reply: | |
1477 | reply.flags = htobe32(reply.flags); | |
eea7556c MD |
1478 | |
1479 | health_code_update(); | |
d3e2ba59 JD |
1480 | ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, sizeof(reply), 0); |
1481 | if (ret < 0) { | |
1482 | ERR("Relay data header to viewer"); | |
1483 | goto end_unlock; | |
1484 | } | |
eea7556c | 1485 | health_code_update(); |
d3e2ba59 JD |
1486 | |
1487 | if (send_data) { | |
eea7556c | 1488 | health_code_update(); |
d3e2ba59 JD |
1489 | ret = cmd->sock->ops->sendmsg(cmd->sock, data, len, 0); |
1490 | if (ret < 0) { | |
1491 | ERR("Relay send data to viewer"); | |
1492 | goto end_unlock; | |
1493 | } | |
eea7556c | 1494 | health_code_update(); |
d3e2ba59 JD |
1495 | } |
1496 | ||
1497 | DBG("Sent %u bytes for stream %" PRIu64, len, | |
1498 | be64toh(get_packet_info.stream_id)); | |
1499 | ||
1500 | end_unlock: | |
1501 | free(data); | |
1502 | rcu_read_unlock(); | |
1503 | ||
1504 | end: | |
1505 | return ret; | |
1506 | } | |
1507 | ||
1508 | /* | |
1509 | * Send the session's metadata | |
1510 | * | |
1511 | * Return 0 on success else a negative value. | |
1512 | */ | |
1513 | static | |
92c6ca54 | 1514 | int viewer_get_metadata(struct relay_command *cmd) |
d3e2ba59 JD |
1515 | { |
1516 | int ret = 0; | |
1517 | ssize_t read_len; | |
1518 | uint64_t len = 0; | |
1519 | char *data = NULL; | |
1520 | struct lttng_viewer_get_metadata request; | |
1521 | struct lttng_viewer_metadata_packet reply; | |
1522 | struct relay_viewer_stream *stream; | |
1523 | ||
1524 | assert(cmd); | |
d3e2ba59 JD |
1525 | |
1526 | DBG("Relay get metadata"); | |
1527 | ||
1528 | if (cmd->version_check_done == 0) { | |
1529 | ERR("Trying to get metadata before version check"); | |
1530 | ret = -1; | |
1531 | goto end; | |
1532 | } | |
1533 | ||
eea7556c | 1534 | health_code_update(); |
d3e2ba59 JD |
1535 | ret = cmd->sock->ops->recvmsg(cmd->sock, &request, |
1536 | sizeof(request), 0); | |
1537 | if (ret < 0 || ret != sizeof(request)) { | |
1538 | ret = -1; | |
1539 | ERR("Relay didn't receive the whole packet"); | |
1540 | goto end; | |
1541 | } | |
eea7556c | 1542 | health_code_update(); |
d3e2ba59 JD |
1543 | |
1544 | rcu_read_lock(); | |
92c6ca54 | 1545 | stream = live_find_viewer_stream_by_id(be64toh(request.stream_id)); |
d3e2ba59 JD |
1546 | if (!stream || !stream->metadata_flag) { |
1547 | ERR("Invalid metadata stream"); | |
1548 | goto error; | |
1549 | } | |
1550 | assert(stream->ctf_trace); | |
1551 | assert(stream->ctf_trace->metadata_sent <= | |
1552 | stream->ctf_trace->metadata_received); | |
1553 | ||
1554 | len = stream->ctf_trace->metadata_received - | |
1555 | stream->ctf_trace->metadata_sent; | |
1556 | if (len == 0) { | |
1557 | reply.status = htobe32(VIEWER_NO_NEW_METADATA); | |
1558 | goto send_reply; | |
1559 | } | |
1560 | ||
1561 | /* first time, we open the metadata file */ | |
1562 | if (stream->read_fd < 0) { | |
1563 | char fullpath[PATH_MAX]; | |
1564 | ||
1565 | ret = snprintf(fullpath, PATH_MAX, "%s/%s", stream->path_name, | |
1566 | stream->channel_name); | |
1567 | if (ret < 0) { | |
1568 | goto error; | |
1569 | } | |
1570 | ret = open(fullpath, O_RDONLY); | |
1571 | if (ret < 0) { | |
1572 | PERROR("Relay opening metadata file"); | |
1573 | goto error; | |
1574 | } | |
1575 | stream->read_fd = ret; | |
1576 | } | |
1577 | ||
1578 | reply.len = htobe64(len); | |
1579 | data = zmalloc(len); | |
1580 | if (!data) { | |
1581 | PERROR("viewer metadata zmalloc"); | |
1582 | goto error; | |
1583 | } | |
1584 | ||
6cd525e8 MD |
1585 | read_len = lttng_read(stream->read_fd, data, len); |
1586 | if (read_len < len) { | |
d3e2ba59 JD |
1587 | PERROR("Relay reading metadata file"); |
1588 | goto error; | |
1589 | } | |
1590 | stream->ctf_trace->metadata_sent += read_len; | |
1591 | reply.status = htobe32(VIEWER_METADATA_OK); | |
1592 | goto send_reply; | |
1593 | ||
1594 | error: | |
1595 | reply.status = htobe32(VIEWER_METADATA_ERR); | |
1596 | ||
1597 | send_reply: | |
eea7556c | 1598 | health_code_update(); |
d3e2ba59 JD |
1599 | ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, sizeof(reply), 0); |
1600 | if (ret < 0) { | |
1601 | ERR("Relay data header to viewer"); | |
1602 | goto end_unlock; | |
1603 | } | |
eea7556c | 1604 | health_code_update(); |
d3e2ba59 JD |
1605 | |
1606 | if (len > 0) { | |
1607 | ret = cmd->sock->ops->sendmsg(cmd->sock, data, len, 0); | |
1608 | if (ret < 0) { | |
1609 | ERR("Relay send data to viewer"); | |
1610 | goto end_unlock; | |
1611 | } | |
1612 | } | |
1613 | ||
1614 | DBG("Sent %" PRIu64 " bytes of metadata for stream %" PRIu64, len, | |
1615 | be64toh(request.stream_id)); | |
1616 | ||
1617 | DBG("Metadata sent"); | |
1618 | ||
1619 | end_unlock: | |
1620 | free(data); | |
1621 | rcu_read_unlock(); | |
1622 | end: | |
1623 | return ret; | |
1624 | } | |
1625 | ||
1626 | /* | |
1627 | * live_relay_unknown_command: send -1 if received unknown command | |
1628 | */ | |
1629 | static | |
1630 | void live_relay_unknown_command(struct relay_command *cmd) | |
1631 | { | |
1632 | struct lttcomm_relayd_generic_reply reply; | |
1633 | int ret; | |
1634 | ||
1635 | reply.ret_code = htobe32(LTTNG_ERR_UNK); | |
1636 | ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, | |
1637 | sizeof(struct lttcomm_relayd_generic_reply), 0); | |
1638 | if (ret < 0) { | |
1639 | ERR("Relay sending unknown command"); | |
1640 | } | |
1641 | } | |
1642 | ||
1643 | /* | |
1644 | * Process the commands received on the control socket | |
1645 | */ | |
1646 | static | |
1647 | int process_control(struct lttng_viewer_cmd *recv_hdr, | |
92c6ca54 | 1648 | struct relay_command *cmd, struct lttng_ht *sessions_ht) |
d3e2ba59 JD |
1649 | { |
1650 | int ret = 0; | |
1651 | ||
1652 | switch (be32toh(recv_hdr->cmd)) { | |
1653 | case VIEWER_CONNECT: | |
1654 | ret = viewer_connect(cmd); | |
1655 | break; | |
1656 | case VIEWER_LIST_SESSIONS: | |
1657 | ret = viewer_list_sessions(cmd, sessions_ht); | |
1658 | break; | |
1659 | case VIEWER_ATTACH_SESSION: | |
92c6ca54 | 1660 | ret = viewer_attach_session(cmd, sessions_ht); |
d3e2ba59 JD |
1661 | break; |
1662 | case VIEWER_GET_NEXT_INDEX: | |
92c6ca54 | 1663 | ret = viewer_get_next_index(cmd, sessions_ht); |
d3e2ba59 JD |
1664 | break; |
1665 | case VIEWER_GET_PACKET: | |
92c6ca54 | 1666 | ret = viewer_get_packet(cmd); |
d3e2ba59 JD |
1667 | break; |
1668 | case VIEWER_GET_METADATA: | |
92c6ca54 | 1669 | ret = viewer_get_metadata(cmd); |
d3e2ba59 JD |
1670 | break; |
1671 | default: | |
1672 | ERR("Received unknown viewer command (%u)", be32toh(recv_hdr->cmd)); | |
1673 | live_relay_unknown_command(cmd); | |
1674 | ret = -1; | |
1675 | goto end; | |
1676 | } | |
1677 | ||
1678 | end: | |
1679 | return ret; | |
1680 | } | |
1681 | ||
1682 | static | |
1683 | void cleanup_poll_connection(struct lttng_poll_event *events, int pollfd) | |
1684 | { | |
1685 | int ret; | |
1686 | ||
1687 | assert(events); | |
1688 | ||
1689 | lttng_poll_del(events, pollfd); | |
1690 | ||
1691 | ret = close(pollfd); | |
1692 | if (ret < 0) { | |
1693 | ERR("Closing pollfd %d", pollfd); | |
1694 | } | |
1695 | } | |
1696 | ||
1697 | /* | |
1698 | * Create and add connection to the given hash table. | |
1699 | * | |
1700 | * Return poll add value or else -1 on error. | |
1701 | */ | |
1702 | static | |
1703 | int add_connection(int fd, struct lttng_poll_event *events, | |
1704 | struct lttng_ht *relay_connections_ht) | |
1705 | { | |
1706 | int ret; | |
1707 | struct relay_command *relay_connection; | |
1708 | ||
1709 | assert(events); | |
1710 | assert(relay_connections_ht); | |
1711 | ||
1712 | relay_connection = zmalloc(sizeof(struct relay_command)); | |
1713 | if (relay_connection == NULL) { | |
1714 | PERROR("Relay command zmalloc"); | |
1715 | goto error; | |
1716 | } | |
1717 | ||
6cd525e8 MD |
1718 | ret = lttng_read(fd, relay_connection, sizeof(*relay_connection)); |
1719 | if (ret < sizeof(*relay_connection)) { | |
d3e2ba59 JD |
1720 | PERROR("read relay cmd pipe"); |
1721 | goto error_read; | |
1722 | } | |
1723 | ||
1724 | lttng_ht_node_init_ulong(&relay_connection->sock_n, | |
1725 | (unsigned long) relay_connection->sock->fd); | |
1726 | rcu_read_lock(); | |
1727 | lttng_ht_add_unique_ulong(relay_connections_ht, | |
1728 | &relay_connection->sock_n); | |
1729 | rcu_read_unlock(); | |
1730 | ||
1731 | return lttng_poll_add(events, relay_connection->sock->fd, | |
1732 | LPOLLIN | LPOLLRDHUP); | |
1733 | ||
1734 | error_read: | |
1735 | free(relay_connection); | |
1736 | error: | |
1737 | return -1; | |
1738 | } | |
1739 | ||
1740 | static | |
1741 | void deferred_free_connection(struct rcu_head *head) | |
1742 | { | |
1743 | struct relay_command *relay_connection = | |
1744 | caa_container_of(head, struct relay_command, rcu_node); | |
1745 | ||
1746 | if (relay_connection->session && | |
1747 | relay_connection->session->viewer_attached > 0) { | |
1748 | relay_connection->session->viewer_attached--; | |
1749 | } | |
1750 | lttcomm_destroy_sock(relay_connection->sock); | |
1751 | free(relay_connection); | |
1752 | } | |
1753 | ||
157df586 JD |
1754 | /* |
1755 | * Delete all streams for a specific session ID. | |
1756 | */ | |
d3e2ba59 | 1757 | static |
b92fdc2b | 1758 | void viewer_del_streams(uint64_t session_id) |
d3e2ba59 | 1759 | { |
d3e2ba59 | 1760 | struct relay_viewer_stream *stream; |
d3e2ba59 JD |
1761 | struct lttng_ht_iter iter; |
1762 | ||
d3e2ba59 | 1763 | rcu_read_lock(); |
157df586 JD |
1764 | cds_lfht_for_each_entry(viewer_streams_ht->ht, &iter.iter, stream, |
1765 | stream_n.node) { | |
eea7556c MD |
1766 | health_code_update(); |
1767 | ||
b92fdc2b | 1768 | if (stream->session_id != session_id) { |
d3e2ba59 JD |
1769 | continue; |
1770 | } | |
1771 | ||
157df586 JD |
1772 | delete_viewer_stream(stream); |
1773 | assert(stream->ctf_trace); | |
1774 | ||
1775 | if (stream->metadata_flag) { | |
1776 | /* | |
1777 | * The metadata viewer stream is destroyed once the refcount on the | |
1778 | * ctf trace goes to 0 in the destroy stream function thus there is | |
1779 | * no explicit call to that function here. | |
1780 | */ | |
d3e2ba59 | 1781 | stream->ctf_trace->metadata_sent = 0; |
157df586 JD |
1782 | stream->ctf_trace->viewer_metadata_stream = NULL; |
1783 | } else { | |
1784 | destroy_viewer_stream(stream); | |
d3e2ba59 | 1785 | } |
d3e2ba59 JD |
1786 | } |
1787 | rcu_read_unlock(); | |
1788 | } | |
1789 | ||
1790 | /* | |
1791 | * Delete and free a connection. | |
1792 | * | |
1793 | * RCU read side lock MUST be acquired. | |
1794 | */ | |
1795 | static | |
1796 | void del_connection(struct lttng_ht *relay_connections_ht, | |
92c6ca54 | 1797 | struct lttng_ht_iter *iter, struct relay_command *relay_connection) |
d3e2ba59 JD |
1798 | { |
1799 | int ret; | |
1800 | ||
1801 | assert(relay_connections_ht); | |
1802 | assert(iter); | |
1803 | assert(relay_connection); | |
d3e2ba59 | 1804 | |
157df586 JD |
1805 | DBG("Cleaning connection of session ID %" PRIu64, |
1806 | relay_connection->session_id); | |
1807 | ||
d3e2ba59 JD |
1808 | ret = lttng_ht_del(relay_connections_ht, iter); |
1809 | assert(!ret); | |
1810 | ||
b92fdc2b | 1811 | viewer_del_streams(relay_connection->session_id); |
d3e2ba59 JD |
1812 | |
1813 | call_rcu(&relay_connection->rcu_node, deferred_free_connection); | |
1814 | } | |
1815 | ||
1816 | /* | |
1817 | * This thread does the actual work | |
1818 | */ | |
1819 | static | |
1820 | void *thread_worker(void *data) | |
1821 | { | |
1822 | int ret, err = -1; | |
1823 | uint32_t nb_fd; | |
1824 | struct relay_command *relay_connection; | |
1825 | struct lttng_poll_event events; | |
1826 | struct lttng_ht *relay_connections_ht; | |
1827 | struct lttng_ht_node_ulong *node; | |
1828 | struct lttng_ht_iter iter; | |
1829 | struct lttng_viewer_cmd recv_hdr; | |
1830 | struct relay_local_data *relay_ctx = (struct relay_local_data *) data; | |
1831 | struct lttng_ht *sessions_ht = relay_ctx->sessions_ht; | |
d3e2ba59 JD |
1832 | |
1833 | DBG("[thread] Live viewer relay worker started"); | |
1834 | ||
1835 | rcu_register_thread(); | |
1836 | ||
eea7556c MD |
1837 | health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_WORKER); |
1838 | ||
9b5e0863 MD |
1839 | if (testpoint(relayd_thread_live_worker)) { |
1840 | goto error_testpoint; | |
1841 | } | |
1842 | ||
d3e2ba59 JD |
1843 | /* table of connections indexed on socket */ |
1844 | relay_connections_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); | |
1845 | if (!relay_connections_ht) { | |
1846 | goto relay_connections_ht_error; | |
1847 | } | |
1848 | ||
1849 | ret = create_thread_poll_set(&events, 2); | |
1850 | if (ret < 0) { | |
1851 | goto error_poll_create; | |
1852 | } | |
1853 | ||
1854 | ret = lttng_poll_add(&events, live_relay_cmd_pipe[0], LPOLLIN | LPOLLRDHUP); | |
1855 | if (ret < 0) { | |
1856 | goto error; | |
1857 | } | |
1858 | ||
1859 | restart: | |
1860 | while (1) { | |
1861 | int i; | |
1862 | ||
eea7556c MD |
1863 | health_code_update(); |
1864 | ||
d3e2ba59 JD |
1865 | /* Infinite blocking call, waiting for transmission */ |
1866 | DBG3("Relayd live viewer worker thread polling..."); | |
eea7556c | 1867 | health_poll_entry(); |
d3e2ba59 | 1868 | ret = lttng_poll_wait(&events, -1); |
eea7556c | 1869 | health_poll_exit(); |
d3e2ba59 JD |
1870 | if (ret < 0) { |
1871 | /* | |
1872 | * Restart interrupted system call. | |
1873 | */ | |
1874 | if (errno == EINTR) { | |
1875 | goto restart; | |
1876 | } | |
1877 | goto error; | |
1878 | } | |
1879 | ||
1880 | nb_fd = ret; | |
1881 | ||
1882 | /* | |
1883 | * Process control. The control connection is prioritised so we don't | |
1884 | * starve it with high throughput tracing data on the data | |
1885 | * connection. | |
1886 | */ | |
1887 | for (i = 0; i < nb_fd; i++) { | |
1888 | /* Fetch once the poll data */ | |
1889 | uint32_t revents = LTTNG_POLL_GETEV(&events, i); | |
1890 | int pollfd = LTTNG_POLL_GETFD(&events, i); | |
1891 | ||
eea7556c MD |
1892 | health_code_update(); |
1893 | ||
d3e2ba59 JD |
1894 | /* Thread quit pipe has been closed. Killing thread. */ |
1895 | ret = check_thread_quit_pipe(pollfd, revents); | |
1896 | if (ret) { | |
1897 | err = 0; | |
1898 | goto exit; | |
1899 | } | |
1900 | ||
1901 | /* Inspect the relay cmd pipe for new connection */ | |
1902 | if (pollfd == live_relay_cmd_pipe[0]) { | |
1903 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1904 | ERR("Relay live pipe error"); | |
1905 | goto error; | |
1906 | } else if (revents & LPOLLIN) { | |
1907 | DBG("Relay live viewer command received"); | |
1908 | ret = add_connection(live_relay_cmd_pipe[0], | |
1909 | &events, relay_connections_ht); | |
1910 | if (ret < 0) { | |
1911 | goto error; | |
1912 | } | |
1913 | } | |
1914 | } else if (revents) { | |
1915 | rcu_read_lock(); | |
1916 | lttng_ht_lookup(relay_connections_ht, | |
1917 | (void *)((unsigned long) pollfd), &iter); | |
1918 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1919 | if (node == NULL) { | |
1920 | DBG2("Relay viewer sock %d not found", pollfd); | |
1921 | rcu_read_unlock(); | |
1922 | goto error; | |
1923 | } | |
1924 | relay_connection = caa_container_of(node, struct relay_command, | |
1925 | sock_n); | |
1926 | ||
1927 | if (revents & (LPOLLERR)) { | |
d3e2ba59 JD |
1928 | cleanup_poll_connection(&events, pollfd); |
1929 | del_connection(relay_connections_ht, &iter, | |
92c6ca54 | 1930 | relay_connection); |
d3e2ba59 JD |
1931 | } else if (revents & (LPOLLHUP | LPOLLRDHUP)) { |
1932 | DBG("Viewer socket %d hung up", pollfd); | |
1933 | cleanup_poll_connection(&events, pollfd); | |
1934 | del_connection(relay_connections_ht, &iter, | |
92c6ca54 | 1935 | relay_connection); |
d3e2ba59 JD |
1936 | } else if (revents & LPOLLIN) { |
1937 | ret = relay_connection->sock->ops->recvmsg( | |
1938 | relay_connection->sock, &recv_hdr, | |
1939 | sizeof(struct lttng_viewer_cmd), | |
1940 | 0); | |
1941 | /* connection closed */ | |
1942 | if (ret <= 0) { | |
1943 | cleanup_poll_connection(&events, pollfd); | |
aaec7998 | 1944 | del_connection(relay_connections_ht, &iter, |
92c6ca54 | 1945 | relay_connection); |
d3e2ba59 JD |
1946 | DBG("Viewer control connection closed with %d", |
1947 | pollfd); | |
1948 | } else { | |
1949 | if (relay_connection->session) { | |
1950 | DBG2("Relay viewer worker receiving data for " | |
1951 | "session: %" PRIu64, | |
1952 | relay_connection->session->id); | |
1953 | } | |
1954 | ret = process_control(&recv_hdr, relay_connection, | |
92c6ca54 | 1955 | sessions_ht); |
d3e2ba59 JD |
1956 | if (ret < 0) { |
1957 | /* Clear the session on error. */ | |
1958 | cleanup_poll_connection(&events, pollfd); | |
1959 | del_connection(relay_connections_ht, &iter, | |
92c6ca54 | 1960 | relay_connection); |
d3e2ba59 JD |
1961 | DBG("Viewer connection closed with %d", pollfd); |
1962 | } | |
1963 | } | |
1964 | } | |
1965 | rcu_read_unlock(); | |
1966 | } | |
1967 | } | |
1968 | } | |
1969 | ||
1970 | exit: | |
1971 | error: | |
1972 | lttng_poll_clean(&events); | |
1973 | ||
1974 | /* empty the hash table and free the memory */ | |
1975 | rcu_read_lock(); | |
1976 | cds_lfht_for_each_entry(relay_connections_ht->ht, &iter.iter, node, node) { | |
eea7556c MD |
1977 | health_code_update(); |
1978 | ||
d3e2ba59 JD |
1979 | node = lttng_ht_iter_get_node_ulong(&iter); |
1980 | if (!node) { | |
1981 | continue; | |
1982 | } | |
1983 | ||
1984 | relay_connection = caa_container_of(node, struct relay_command, | |
1985 | sock_n); | |
92c6ca54 | 1986 | del_connection(relay_connections_ht, &iter, relay_connection); |
d3e2ba59 JD |
1987 | } |
1988 | rcu_read_unlock(); | |
1989 | error_poll_create: | |
1990 | lttng_ht_destroy(relay_connections_ht); | |
1991 | relay_connections_ht_error: | |
1992 | /* Close relay cmd pipes */ | |
1993 | utils_close_pipe(live_relay_cmd_pipe); | |
1994 | if (err) { | |
1995 | DBG("Viewer worker thread exited with error"); | |
1996 | } | |
1997 | DBG("Viewer worker thread cleanup complete"); | |
9b5e0863 | 1998 | error_testpoint: |
eea7556c MD |
1999 | if (err) { |
2000 | health_error(); | |
2001 | ERR("Health error occurred in %s", __func__); | |
2002 | } | |
2003 | health_unregister(health_relayd); | |
d3e2ba59 JD |
2004 | stop_threads(); |
2005 | rcu_unregister_thread(); | |
2006 | return NULL; | |
2007 | } | |
2008 | ||
2009 | /* | |
2010 | * Create the relay command pipe to wake thread_manage_apps. | |
2011 | * Closed in cleanup(). | |
2012 | */ | |
2013 | static int create_relay_cmd_pipe(void) | |
2014 | { | |
2015 | int ret; | |
2016 | ||
2017 | ret = utils_create_pipe_cloexec(live_relay_cmd_pipe); | |
2018 | ||
2019 | return ret; | |
2020 | } | |
2021 | ||
aaec7998 | 2022 | void live_stop_threads(void) |
d3e2ba59 JD |
2023 | { |
2024 | int ret; | |
2025 | void *status; | |
2026 | ||
2027 | stop_threads(); | |
2028 | ||
2029 | ret = pthread_join(live_listener_thread, &status); | |
2030 | if (ret != 0) { | |
2031 | PERROR("pthread_join live listener"); | |
2032 | goto error; /* join error, exit without cleanup */ | |
2033 | } | |
2034 | ||
2035 | ret = pthread_join(live_worker_thread, &status); | |
2036 | if (ret != 0) { | |
2037 | PERROR("pthread_join live worker"); | |
2038 | goto error; /* join error, exit without cleanup */ | |
2039 | } | |
2040 | ||
2041 | ret = pthread_join(live_dispatcher_thread, &status); | |
2042 | if (ret != 0) { | |
2043 | PERROR("pthread_join live dispatcher"); | |
2044 | goto error; /* join error, exit without cleanup */ | |
2045 | } | |
2046 | ||
2047 | cleanup(); | |
2048 | ||
2049 | error: | |
2050 | return; | |
2051 | } | |
2052 | ||
2053 | /* | |
2054 | * main | |
2055 | */ | |
2056 | int live_start_threads(struct lttng_uri *uri, | |
0b242f62 | 2057 | struct relay_local_data *relay_ctx) |
d3e2ba59 JD |
2058 | { |
2059 | int ret = 0; | |
2060 | void *status; | |
2061 | int is_root; | |
2062 | ||
2063 | assert(uri); | |
2064 | live_uri = uri; | |
2065 | ||
d3e2ba59 JD |
2066 | /* Check if daemon is UID = 0 */ |
2067 | is_root = !getuid(); | |
2068 | ||
2069 | if (!is_root) { | |
2070 | if (live_uri->port < 1024) { | |
2071 | ERR("Need to be root to use ports < 1024"); | |
2072 | ret = -1; | |
2073 | goto exit; | |
2074 | } | |
2075 | } | |
2076 | ||
2077 | /* Setup the thread apps communication pipe. */ | |
2078 | if ((ret = create_relay_cmd_pipe()) < 0) { | |
2079 | goto exit; | |
2080 | } | |
2081 | ||
2082 | /* Init relay command queue. */ | |
2083 | cds_wfq_init(&viewer_cmd_queue.queue); | |
2084 | ||
2085 | /* Set up max poll set size */ | |
2086 | lttng_poll_set_max_size(); | |
2087 | ||
2088 | /* Setup the dispatcher thread */ | |
2089 | ret = pthread_create(&live_dispatcher_thread, NULL, | |
2090 | thread_dispatcher, (void *) NULL); | |
2091 | if (ret != 0) { | |
2092 | PERROR("pthread_create viewer dispatcher"); | |
2093 | goto exit_dispatcher; | |
2094 | } | |
2095 | ||
2096 | /* Setup the worker thread */ | |
2097 | ret = pthread_create(&live_worker_thread, NULL, | |
2098 | thread_worker, relay_ctx); | |
2099 | if (ret != 0) { | |
2100 | PERROR("pthread_create viewer worker"); | |
2101 | goto exit_worker; | |
2102 | } | |
2103 | ||
2104 | /* Setup the listener thread */ | |
2105 | ret = pthread_create(&live_listener_thread, NULL, | |
2106 | thread_listener, (void *) NULL); | |
2107 | if (ret != 0) { | |
2108 | PERROR("pthread_create viewer listener"); | |
2109 | goto exit_listener; | |
2110 | } | |
2111 | ||
2112 | ret = 0; | |
2113 | goto end; | |
2114 | ||
2115 | exit_listener: | |
2116 | ret = pthread_join(live_listener_thread, &status); | |
2117 | if (ret != 0) { | |
2118 | PERROR("pthread_join live listener"); | |
2119 | goto error; /* join error, exit without cleanup */ | |
2120 | } | |
2121 | ||
2122 | exit_worker: | |
2123 | ret = pthread_join(live_worker_thread, &status); | |
2124 | if (ret != 0) { | |
2125 | PERROR("pthread_join live worker"); | |
2126 | goto error; /* join error, exit without cleanup */ | |
2127 | } | |
2128 | ||
2129 | exit_dispatcher: | |
2130 | ret = pthread_join(live_dispatcher_thread, &status); | |
2131 | if (ret != 0) { | |
2132 | PERROR("pthread_join live dispatcher"); | |
2133 | goto error; /* join error, exit without cleanup */ | |
2134 | } | |
2135 | ||
2136 | exit: | |
2137 | cleanup(); | |
2138 | ||
2139 | end: | |
2140 | error: | |
2141 | return ret; | |
2142 | } |