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" |
d3e2ba59 JD |
60 | |
61 | static struct lttng_uri *live_uri; | |
62 | ||
63 | /* | |
64 | * Quit pipe for all threads. This permits a single cancellation point | |
65 | * for all threads when receiving an event on the pipe. | |
66 | */ | |
67 | static int live_thread_quit_pipe[2] = { -1, -1 }; | |
68 | ||
69 | /* | |
70 | * This pipe is used to inform the worker thread that a command is queued and | |
71 | * ready to be processed. | |
72 | */ | |
73 | static int live_relay_cmd_pipe[2] = { -1, -1 }; | |
74 | ||
75 | /* Shared between threads */ | |
76 | static int live_dispatch_thread_exit; | |
77 | ||
78 | static pthread_t live_listener_thread; | |
79 | static pthread_t live_dispatcher_thread; | |
80 | static pthread_t live_worker_thread; | |
81 | ||
82 | /* | |
83 | * Relay command queue. | |
84 | * | |
85 | * The live_thread_listener and live_thread_dispatcher communicate with this | |
86 | * queue. | |
87 | */ | |
88 | static struct relay_cmd_queue viewer_cmd_queue; | |
89 | ||
90 | static uint64_t last_relay_viewer_session_id; | |
91 | ||
92 | /* | |
93 | * Cleanup the daemon | |
94 | */ | |
95 | static | |
96 | void cleanup(void) | |
97 | { | |
98 | DBG("Cleaning up"); | |
99 | ||
d3e2ba59 JD |
100 | free(live_uri); |
101 | } | |
102 | ||
103 | /* | |
104 | * Write to writable pipe used to notify a thread. | |
105 | */ | |
106 | static | |
107 | int notify_thread_pipe(int wpipe) | |
108 | { | |
6cd525e8 | 109 | ssize_t ret; |
d3e2ba59 | 110 | |
6cd525e8 MD |
111 | ret = lttng_write(wpipe, "!", 1); |
112 | if (ret < 1) { | |
d3e2ba59 JD |
113 | PERROR("write poll pipe"); |
114 | } | |
115 | ||
6cd525e8 | 116 | return (int) ret; |
d3e2ba59 JD |
117 | } |
118 | ||
119 | /* | |
120 | * Stop all threads by closing the thread quit pipe. | |
121 | */ | |
122 | static | |
123 | void stop_threads(void) | |
124 | { | |
125 | int ret; | |
126 | ||
127 | /* Stopping all threads */ | |
128 | DBG("Terminating all live threads"); | |
129 | ret = notify_thread_pipe(live_thread_quit_pipe[1]); | |
130 | if (ret < 0) { | |
131 | ERR("write error on thread quit pipe"); | |
132 | } | |
133 | ||
134 | /* Dispatch thread */ | |
135 | CMM_STORE_SHARED(live_dispatch_thread_exit, 1); | |
136 | futex_nto1_wake(&viewer_cmd_queue.futex); | |
137 | } | |
138 | ||
d3e2ba59 JD |
139 | /* |
140 | * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set. | |
141 | */ | |
142 | static | |
143 | int create_thread_poll_set(struct lttng_poll_event *events, int size) | |
144 | { | |
145 | int ret; | |
146 | ||
147 | if (events == NULL || size == 0) { | |
148 | ret = -1; | |
149 | goto error; | |
150 | } | |
151 | ||
152 | ret = lttng_poll_create(events, size, LTTNG_CLOEXEC); | |
153 | if (ret < 0) { | |
154 | goto error; | |
155 | } | |
156 | ||
157 | /* Add quit pipe */ | |
158 | ret = lttng_poll_add(events, live_thread_quit_pipe[0], LPOLLIN); | |
159 | if (ret < 0) { | |
160 | goto error; | |
161 | } | |
162 | ||
163 | return 0; | |
164 | ||
165 | error: | |
166 | return ret; | |
167 | } | |
168 | ||
169 | /* | |
170 | * Check if the thread quit pipe was triggered. | |
171 | * | |
172 | * Return 1 if it was triggered else 0; | |
173 | */ | |
174 | static | |
175 | int check_thread_quit_pipe(int fd, uint32_t events) | |
176 | { | |
177 | if (fd == live_thread_quit_pipe[0] && (events & LPOLLIN)) { | |
178 | return 1; | |
179 | } | |
180 | ||
181 | return 0; | |
182 | } | |
183 | ||
184 | /* | |
185 | * Create and init socket from uri. | |
186 | */ | |
187 | static | |
188 | struct lttcomm_sock *init_socket(struct lttng_uri *uri) | |
189 | { | |
190 | int ret; | |
191 | struct lttcomm_sock *sock = NULL; | |
192 | ||
193 | sock = lttcomm_alloc_sock_from_uri(uri); | |
194 | if (sock == NULL) { | |
195 | ERR("Allocating socket"); | |
196 | goto error; | |
197 | } | |
198 | ||
199 | ret = lttcomm_create_sock(sock); | |
200 | if (ret < 0) { | |
201 | goto error; | |
202 | } | |
203 | DBG("Listening on sock %d for live", sock->fd); | |
204 | ||
205 | ret = sock->ops->bind(sock); | |
206 | if (ret < 0) { | |
207 | goto error; | |
208 | } | |
209 | ||
210 | ret = sock->ops->listen(sock, -1); | |
211 | if (ret < 0) { | |
212 | goto error; | |
213 | ||
214 | } | |
215 | ||
216 | return sock; | |
217 | ||
218 | error: | |
219 | if (sock) { | |
220 | lttcomm_destroy_sock(sock); | |
221 | } | |
222 | return NULL; | |
223 | } | |
224 | ||
225 | /* | |
226 | * This thread manages the listening for new connections on the network | |
227 | */ | |
228 | static | |
229 | void *thread_listener(void *data) | |
230 | { | |
231 | int i, ret, pollfd, err = -1; | |
232 | int val = 1; | |
233 | uint32_t revents, nb_fd; | |
234 | struct lttng_poll_event events; | |
235 | struct lttcomm_sock *live_control_sock; | |
236 | ||
237 | DBG("[thread] Relay live listener started"); | |
238 | ||
eea7556c MD |
239 | health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_LISTENER); |
240 | ||
241 | health_code_update(); | |
242 | ||
d3e2ba59 JD |
243 | live_control_sock = init_socket(live_uri); |
244 | if (!live_control_sock) { | |
245 | goto error_sock_control; | |
246 | } | |
247 | ||
248 | /* | |
249 | * Pass 3 as size here for the thread quit pipe, control and data socket. | |
250 | */ | |
251 | ret = create_thread_poll_set(&events, 2); | |
252 | if (ret < 0) { | |
253 | goto error_create_poll; | |
254 | } | |
255 | ||
256 | /* Add the control socket */ | |
257 | ret = lttng_poll_add(&events, live_control_sock->fd, LPOLLIN | LPOLLRDHUP); | |
258 | if (ret < 0) { | |
259 | goto error_poll_add; | |
260 | } | |
261 | ||
3fd27398 MD |
262 | lttng_relay_notify_ready(); |
263 | ||
d3e2ba59 | 264 | while (1) { |
eea7556c MD |
265 | health_code_update(); |
266 | ||
d3e2ba59 JD |
267 | DBG("Listener accepting live viewers connections"); |
268 | ||
269 | restart: | |
eea7556c | 270 | health_poll_entry(); |
d3e2ba59 | 271 | ret = lttng_poll_wait(&events, -1); |
eea7556c | 272 | health_poll_exit(); |
d3e2ba59 JD |
273 | if (ret < 0) { |
274 | /* | |
275 | * Restart interrupted system call. | |
276 | */ | |
277 | if (errno == EINTR) { | |
278 | goto restart; | |
279 | } | |
280 | goto error; | |
281 | } | |
282 | nb_fd = ret; | |
283 | ||
284 | DBG("Relay new viewer connection received"); | |
285 | for (i = 0; i < nb_fd; i++) { | |
eea7556c MD |
286 | health_code_update(); |
287 | ||
d3e2ba59 JD |
288 | /* Fetch once the poll data */ |
289 | revents = LTTNG_POLL_GETEV(&events, i); | |
290 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
291 | ||
292 | /* Thread quit pipe has been closed. Killing thread. */ | |
293 | ret = check_thread_quit_pipe(pollfd, revents); | |
294 | if (ret) { | |
295 | err = 0; | |
296 | goto exit; | |
297 | } | |
298 | ||
299 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
300 | ERR("socket poll error"); | |
301 | goto error; | |
302 | } else if (revents & LPOLLIN) { | |
303 | /* | |
304 | * Get allocated in this thread, enqueued to a global queue, | |
305 | * dequeued and freed in the worker thread. | |
306 | */ | |
307 | struct relay_command *relay_cmd; | |
308 | struct lttcomm_sock *newsock; | |
309 | ||
310 | relay_cmd = zmalloc(sizeof(*relay_cmd)); | |
311 | if (!relay_cmd) { | |
312 | PERROR("relay command zmalloc"); | |
313 | goto error; | |
314 | } | |
315 | ||
316 | assert(pollfd == live_control_sock->fd); | |
317 | newsock = live_control_sock->ops->accept(live_control_sock); | |
318 | if (!newsock) { | |
319 | PERROR("accepting control sock"); | |
320 | free(relay_cmd); | |
321 | goto error; | |
322 | } | |
323 | DBG("Relay viewer connection accepted socket %d", newsock->fd); | |
324 | ret = setsockopt(newsock->fd, SOL_SOCKET, SO_REUSEADDR, &val, | |
325 | sizeof(int)); | |
326 | if (ret < 0) { | |
327 | PERROR("setsockopt inet"); | |
328 | lttcomm_destroy_sock(newsock); | |
329 | free(relay_cmd); | |
330 | goto error; | |
331 | } | |
332 | relay_cmd->sock = newsock; | |
333 | ||
334 | /* | |
335 | * Lock free enqueue the request. | |
336 | */ | |
337 | cds_wfq_enqueue(&viewer_cmd_queue.queue, &relay_cmd->node); | |
338 | ||
339 | /* | |
340 | * Wake the dispatch queue futex. Implicit memory | |
341 | * barrier with the exchange in cds_wfq_enqueue. | |
342 | */ | |
343 | futex_nto1_wake(&viewer_cmd_queue.futex); | |
344 | } | |
345 | } | |
346 | } | |
347 | ||
348 | exit: | |
349 | error: | |
350 | error_poll_add: | |
351 | lttng_poll_clean(&events); | |
352 | error_create_poll: | |
353 | if (live_control_sock->fd >= 0) { | |
354 | ret = live_control_sock->ops->close(live_control_sock); | |
355 | if (ret) { | |
356 | PERROR("close"); | |
357 | } | |
358 | } | |
359 | lttcomm_destroy_sock(live_control_sock); | |
360 | error_sock_control: | |
361 | if (err) { | |
eea7556c | 362 | health_error(); |
d3e2ba59 JD |
363 | DBG("Live viewer listener thread exited with error"); |
364 | } | |
eea7556c | 365 | health_unregister(health_relayd); |
d3e2ba59 JD |
366 | DBG("Live viewer listener thread cleanup complete"); |
367 | stop_threads(); | |
368 | return NULL; | |
369 | } | |
370 | ||
371 | /* | |
372 | * This thread manages the dispatching of the requests to worker threads | |
373 | */ | |
374 | static | |
375 | void *thread_dispatcher(void *data) | |
376 | { | |
6cd525e8 MD |
377 | int err = -1; |
378 | ssize_t ret; | |
d3e2ba59 JD |
379 | struct cds_wfq_node *node; |
380 | struct relay_command *relay_cmd = NULL; | |
381 | ||
382 | DBG("[thread] Live viewer relay dispatcher started"); | |
383 | ||
eea7556c MD |
384 | health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_DISPATCHER); |
385 | ||
386 | health_code_update(); | |
387 | ||
d3e2ba59 | 388 | while (!CMM_LOAD_SHARED(live_dispatch_thread_exit)) { |
eea7556c MD |
389 | health_code_update(); |
390 | ||
d3e2ba59 JD |
391 | /* Atomically prepare the queue futex */ |
392 | futex_nto1_prepare(&viewer_cmd_queue.futex); | |
393 | ||
394 | do { | |
eea7556c MD |
395 | health_code_update(); |
396 | ||
d3e2ba59 JD |
397 | /* Dequeue commands */ |
398 | node = cds_wfq_dequeue_blocking(&viewer_cmd_queue.queue); | |
399 | if (node == NULL) { | |
400 | DBG("Woken up but nothing in the live-viewer " | |
401 | "relay command queue"); | |
402 | /* Continue thread execution */ | |
403 | break; | |
404 | } | |
405 | ||
406 | relay_cmd = caa_container_of(node, struct relay_command, node); | |
407 | DBG("Dispatching viewer request waiting on sock %d", | |
408 | relay_cmd->sock->fd); | |
409 | ||
410 | /* | |
411 | * Inform worker thread of the new request. This call is blocking | |
412 | * so we can be assured that the data will be read at some point in | |
413 | * time or wait to the end of the world :) | |
414 | */ | |
6cd525e8 MD |
415 | ret = lttng_write(live_relay_cmd_pipe[1], relay_cmd, |
416 | sizeof(*relay_cmd)); | |
d3e2ba59 | 417 | free(relay_cmd); |
6cd525e8 | 418 | if (ret < sizeof(struct relay_command)) { |
d3e2ba59 JD |
419 | PERROR("write cmd pipe"); |
420 | goto error; | |
421 | } | |
422 | } while (node != NULL); | |
423 | ||
424 | /* Futex wait on queue. Blocking call on futex() */ | |
eea7556c | 425 | health_poll_entry(); |
d3e2ba59 | 426 | futex_nto1_wait(&viewer_cmd_queue.futex); |
eea7556c | 427 | health_poll_exit(); |
d3e2ba59 JD |
428 | } |
429 | ||
eea7556c MD |
430 | /* Normal exit, no error */ |
431 | err = 0; | |
432 | ||
d3e2ba59 | 433 | error: |
eea7556c MD |
434 | if (err) { |
435 | health_error(); | |
436 | ERR("Health error occurred in %s", __func__); | |
437 | } | |
438 | health_unregister(health_relayd); | |
d3e2ba59 JD |
439 | DBG("Live viewer dispatch thread dying"); |
440 | stop_threads(); | |
441 | return NULL; | |
442 | } | |
443 | ||
444 | /* | |
445 | * Establish connection with the viewer and check the versions. | |
446 | * | |
447 | * Return 0 on success or else negative value. | |
448 | */ | |
449 | static | |
450 | int viewer_connect(struct relay_command *cmd) | |
451 | { | |
452 | int ret; | |
453 | struct lttng_viewer_connect reply, msg; | |
454 | ||
455 | assert(cmd); | |
456 | ||
457 | cmd->version_check_done = 1; | |
458 | ||
eea7556c MD |
459 | health_code_update(); |
460 | ||
d3e2ba59 JD |
461 | /* Get version from the other side. */ |
462 | ret = cmd->sock->ops->recvmsg(cmd->sock, &msg, sizeof(msg), 0); | |
463 | if (ret < 0 || ret != sizeof(msg)) { | |
464 | if (ret == 0) { | |
465 | /* Orderly shutdown. Not necessary to print an error. */ | |
466 | DBG("Socket %d did an orderly shutdown", cmd->sock->fd); | |
467 | } else { | |
468 | ERR("Relay failed to receive the version values."); | |
469 | } | |
470 | ret = -1; | |
471 | goto end; | |
472 | } | |
473 | ||
eea7556c MD |
474 | health_code_update(); |
475 | ||
d3e2ba59 JD |
476 | reply.major = RELAYD_VERSION_COMM_MAJOR; |
477 | reply.minor = RELAYD_VERSION_COMM_MINOR; | |
478 | ||
479 | /* Major versions must be the same */ | |
480 | if (reply.major != be32toh(msg.major)) { | |
481 | DBG("Incompatible major versions (%u vs %u)", reply.major, | |
482 | be32toh(msg.major)); | |
72180669 | 483 | ret = -1; |
d3e2ba59 JD |
484 | goto end; |
485 | } | |
486 | ||
487 | cmd->major = reply.major; | |
488 | /* We adapt to the lowest compatible version */ | |
489 | if (reply.minor <= be32toh(msg.minor)) { | |
490 | cmd->minor = reply.minor; | |
491 | } else { | |
492 | cmd->minor = be32toh(msg.minor); | |
493 | } | |
494 | ||
495 | if (be32toh(msg.type) == VIEWER_CLIENT_COMMAND) { | |
496 | cmd->type = RELAY_VIEWER_COMMAND; | |
497 | } else if (be32toh(msg.type) == VIEWER_CLIENT_NOTIFICATION) { | |
498 | cmd->type = RELAY_VIEWER_NOTIFICATION; | |
499 | } else { | |
500 | ERR("Unknown connection type : %u", be32toh(msg.type)); | |
501 | ret = -1; | |
502 | goto end; | |
503 | } | |
504 | ||
505 | reply.major = htobe32(reply.major); | |
506 | reply.minor = htobe32(reply.minor); | |
507 | if (cmd->type == RELAY_VIEWER_COMMAND) { | |
508 | reply.viewer_session_id = htobe64(++last_relay_viewer_session_id); | |
509 | } | |
eea7556c MD |
510 | |
511 | health_code_update(); | |
512 | ||
d3e2ba59 JD |
513 | ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, |
514 | sizeof(struct lttng_viewer_connect), 0); | |
515 | if (ret < 0) { | |
516 | ERR("Relay sending version"); | |
517 | } | |
518 | ||
eea7556c MD |
519 | health_code_update(); |
520 | ||
d3e2ba59 JD |
521 | DBG("Version check done using protocol %u.%u", cmd->major, cmd->minor); |
522 | ret = 0; | |
523 | ||
524 | end: | |
525 | return ret; | |
526 | } | |
527 | ||
528 | /* | |
529 | * Send the viewer the list of current sessions. | |
530 | * | |
531 | * Return 0 on success or else a negative value. | |
532 | */ | |
533 | static | |
534 | int viewer_list_sessions(struct relay_command *cmd, | |
535 | struct lttng_ht *sessions_ht) | |
536 | { | |
537 | int ret; | |
538 | struct lttng_viewer_list_sessions session_list; | |
539 | unsigned long count; | |
540 | long approx_before, approx_after; | |
541 | struct lttng_ht_node_ulong *node; | |
542 | struct lttng_ht_iter iter; | |
543 | struct lttng_viewer_session send_session; | |
544 | struct relay_session *session; | |
545 | ||
546 | DBG("List sessions received"); | |
547 | ||
548 | if (cmd->version_check_done == 0) { | |
549 | ERR("Trying to list sessions before version check"); | |
550 | ret = -1; | |
551 | goto end_no_session; | |
552 | } | |
553 | ||
554 | rcu_read_lock(); | |
555 | cds_lfht_count_nodes(sessions_ht->ht, &approx_before, &count, &approx_after); | |
556 | session_list.sessions_count = htobe32(count); | |
557 | ||
eea7556c MD |
558 | health_code_update(); |
559 | ||
d3e2ba59 JD |
560 | ret = cmd->sock->ops->sendmsg(cmd->sock, &session_list, |
561 | sizeof(session_list), 0); | |
562 | if (ret < 0) { | |
563 | ERR("Relay sending sessions list"); | |
564 | goto end_unlock; | |
565 | } | |
566 | ||
eea7556c MD |
567 | health_code_update(); |
568 | ||
d3e2ba59 | 569 | cds_lfht_for_each_entry(sessions_ht->ht, &iter.iter, node, node) { |
eea7556c MD |
570 | health_code_update(); |
571 | ||
d3e2ba59 JD |
572 | node = lttng_ht_iter_get_node_ulong(&iter); |
573 | if (!node) { | |
574 | goto end_unlock; | |
575 | } | |
576 | session = caa_container_of(node, struct relay_session, session_n); | |
577 | ||
578 | strncpy(send_session.session_name, session->session_name, | |
579 | sizeof(send_session.session_name)); | |
580 | strncpy(send_session.hostname, session->hostname, | |
581 | sizeof(send_session.hostname)); | |
582 | send_session.id = htobe64(session->id); | |
583 | send_session.live_timer = htobe32(session->live_timer); | |
584 | send_session.clients = htobe32(session->viewer_attached); | |
87b576ec | 585 | send_session.streams = htobe32(session->stream_count); |
d3e2ba59 | 586 | |
eea7556c MD |
587 | health_code_update(); |
588 | ||
d3e2ba59 JD |
589 | ret = cmd->sock->ops->sendmsg(cmd->sock, &send_session, |
590 | sizeof(send_session), 0); | |
591 | if (ret < 0) { | |
592 | ERR("Relay sending session info"); | |
593 | goto end_unlock; | |
594 | } | |
595 | } | |
eea7556c MD |
596 | health_code_update(); |
597 | ||
d3e2ba59 JD |
598 | rcu_read_unlock(); |
599 | ret = 0; | |
600 | goto end; | |
601 | ||
602 | end_unlock: | |
603 | rcu_read_unlock(); | |
604 | ||
605 | end: | |
606 | end_no_session: | |
607 | return ret; | |
608 | } | |
609 | ||
0e6830aa JD |
610 | /* |
611 | * Open index file using a given viewer stream. | |
612 | * | |
613 | * Return 0 on success or else a negative value. | |
614 | */ | |
615 | static int open_index(struct relay_viewer_stream *stream) | |
616 | { | |
617 | int ret; | |
618 | char fullpath[PATH_MAX]; | |
50adc264 | 619 | struct ctf_packet_index_file_hdr hdr; |
0e6830aa | 620 | |
6b6b9a5a JD |
621 | if (stream->tracefile_count > 0) { |
622 | ret = snprintf(fullpath, sizeof(fullpath), "%s/" DEFAULT_INDEX_DIR "/%s_%" | |
623 | PRIu64 DEFAULT_INDEX_FILE_SUFFIX, stream->path_name, | |
624 | stream->channel_name, stream->tracefile_count_current); | |
625 | } else { | |
626 | ret = snprintf(fullpath, sizeof(fullpath), "%s/" DEFAULT_INDEX_DIR "/%s" | |
627 | DEFAULT_INDEX_FILE_SUFFIX, stream->path_name, | |
628 | stream->channel_name); | |
0e6830aa | 629 | } |
0e6830aa JD |
630 | if (ret < 0) { |
631 | PERROR("snprintf index path"); | |
632 | goto error; | |
633 | } | |
634 | ||
635 | DBG("Opening index file %s in read only", fullpath); | |
636 | ret = open(fullpath, O_RDONLY); | |
637 | if (ret < 0) { | |
638 | if (errno == ENOENT) { | |
639 | ret = -ENOENT; | |
640 | goto error; | |
641 | } else { | |
642 | PERROR("opening index in read-only"); | |
643 | } | |
644 | goto error; | |
645 | } | |
646 | stream->index_read_fd = ret; | |
647 | DBG("Opening index file %s in read only, (fd: %d)", fullpath, ret); | |
648 | ||
6cd525e8 MD |
649 | ret = lttng_read(stream->index_read_fd, &hdr, sizeof(hdr)); |
650 | if (ret < sizeof(hdr)) { | |
0e6830aa JD |
651 | PERROR("Reading index header"); |
652 | goto error; | |
653 | } | |
50adc264 | 654 | if (be32toh(hdr.magic) != CTF_INDEX_MAGIC) { |
0e6830aa JD |
655 | ERR("Invalid header magic"); |
656 | ret = -1; | |
657 | goto error; | |
658 | } | |
50adc264 JD |
659 | if (be32toh(hdr.index_major) != CTF_INDEX_MAJOR || |
660 | be32toh(hdr.index_minor) != CTF_INDEX_MINOR) { | |
0e6830aa JD |
661 | ERR("Invalid header version"); |
662 | ret = -1; | |
663 | goto error; | |
664 | } | |
665 | ret = 0; | |
666 | ||
667 | error: | |
0e6830aa JD |
668 | return ret; |
669 | } | |
670 | ||
d3e2ba59 JD |
671 | /* |
672 | * Allocate and init a new viewer_stream. | |
673 | * | |
674 | * Copies the values from the stream passed in parameter and insert the new | |
675 | * stream in the viewer_streams_ht. | |
676 | * | |
677 | * MUST be called with rcu_read_lock held. | |
678 | * | |
679 | * Returns 0 on success or a negative value on error. | |
680 | */ | |
681 | static | |
0e6830aa | 682 | int init_viewer_stream(struct relay_stream *stream, int seek_last) |
d3e2ba59 JD |
683 | { |
684 | int ret; | |
685 | struct relay_viewer_stream *viewer_stream; | |
686 | ||
687 | assert(stream); | |
d3e2ba59 JD |
688 | |
689 | viewer_stream = zmalloc(sizeof(*viewer_stream)); | |
690 | if (!viewer_stream) { | |
691 | PERROR("relay viewer stream zmalloc"); | |
692 | ret = -1; | |
693 | goto error; | |
694 | } | |
d3e2ba59 JD |
695 | viewer_stream->session_id = stream->session->id; |
696 | viewer_stream->stream_handle = stream->stream_handle; | |
697 | viewer_stream->path_name = strndup(stream->path_name, | |
698 | LTTNG_VIEWER_PATH_MAX); | |
699 | viewer_stream->channel_name = strndup(stream->channel_name, | |
700 | LTTNG_VIEWER_NAME_MAX); | |
d3e2ba59 JD |
701 | viewer_stream->tracefile_count = stream->tracefile_count; |
702 | viewer_stream->metadata_flag = stream->metadata_flag; | |
a020f610 | 703 | viewer_stream->tracefile_count_last = -1ULL; |
6b6b9a5a JD |
704 | if (seek_last) { |
705 | viewer_stream->tracefile_count_current = | |
706 | stream->tracefile_count_current; | |
707 | } else { | |
708 | viewer_stream->tracefile_count_current = | |
709 | stream->oldest_tracefile_id; | |
710 | } | |
711 | ||
6b6b9a5a | 712 | viewer_stream->ctf_trace = stream->ctf_trace; |
157df586 JD |
713 | if (viewer_stream->metadata_flag) { |
714 | viewer_stream->ctf_trace->viewer_metadata_stream = | |
715 | viewer_stream; | |
716 | } | |
6b6b9a5a | 717 | uatomic_inc(&viewer_stream->ctf_trace->refcount); |
d3e2ba59 | 718 | |
6b6b9a5a JD |
719 | lttng_ht_node_init_u64(&viewer_stream->stream_n, stream->stream_handle); |
720 | lttng_ht_add_unique_u64(viewer_streams_ht, &viewer_stream->stream_n); | |
721 | ||
722 | viewer_stream->index_read_fd = -1; | |
723 | viewer_stream->read_fd = -1; | |
724 | ||
725 | /* | |
726 | * This is to avoid a race between the initialization of this object and | |
727 | * the close of the given stream. If the stream is unable to find this | |
728 | * viewer stream when closing, this copy will at least take the latest | |
729 | * value. | |
730 | * We also need that for the seek_last. | |
731 | */ | |
732 | viewer_stream->total_index_received = stream->total_index_received; | |
733 | ||
734 | /* | |
735 | * If we never received an index for the current stream, delay | |
736 | * the opening of the index, otherwise open it right now. | |
737 | */ | |
738 | if (viewer_stream->tracefile_count_current == | |
739 | stream->tracefile_count_current && | |
740 | viewer_stream->total_index_received == 0) { | |
741 | viewer_stream->index_read_fd = -1; | |
742 | } else { | |
0e6830aa JD |
743 | ret = open_index(viewer_stream); |
744 | if (ret < 0) { | |
745 | goto error; | |
746 | } | |
6b6b9a5a JD |
747 | } |
748 | ||
749 | if (seek_last && viewer_stream->index_read_fd > 0) { | |
0e6830aa JD |
750 | ret = lseek(viewer_stream->index_read_fd, |
751 | viewer_stream->total_index_received * | |
50adc264 | 752 | sizeof(struct ctf_packet_index), |
0e6830aa JD |
753 | SEEK_CUR); |
754 | if (ret < 0) { | |
755 | goto error; | |
756 | } | |
757 | viewer_stream->last_sent_index = | |
758 | viewer_stream->total_index_received; | |
759 | } | |
760 | ||
6b6b9a5a JD |
761 | ret = 0; |
762 | ||
763 | error: | |
764 | return ret; | |
765 | } | |
766 | ||
767 | /* | |
768 | * Rotate a stream to the next tracefile. | |
769 | * | |
a020f610 | 770 | * Returns 0 on success, 1 on EOF, a negative value on error. |
6b6b9a5a JD |
771 | */ |
772 | static | |
773 | int rotate_viewer_stream(struct relay_viewer_stream *viewer_stream, | |
774 | struct relay_stream *stream) | |
775 | { | |
776 | int ret; | |
777 | uint64_t tracefile_id; | |
778 | ||
779 | assert(viewer_stream); | |
780 | ||
781 | tracefile_id = (viewer_stream->tracefile_count_current + 1) % | |
782 | viewer_stream->tracefile_count; | |
a020f610 JD |
783 | /* |
784 | * Detect the last tracefile to open. | |
785 | */ | |
786 | if (viewer_stream->tracefile_count_last != -1ULL && | |
787 | viewer_stream->tracefile_count_last == | |
788 | viewer_stream->tracefile_count_current) { | |
789 | ret = 1; | |
790 | goto end; | |
791 | } | |
d3e2ba59 | 792 | |
6b6b9a5a JD |
793 | if (stream) { |
794 | pthread_mutex_lock(&stream->viewer_stream_rotation_lock); | |
795 | } | |
d3e2ba59 | 796 | /* |
6b6b9a5a JD |
797 | * The writer and the reader are not working in the same |
798 | * tracefile, we can read up to EOF, we don't care about the | |
799 | * total_index_received. | |
d3e2ba59 | 800 | */ |
6b6b9a5a JD |
801 | if (!stream || (stream->tracefile_count_current != tracefile_id)) { |
802 | viewer_stream->close_write_flag = 1; | |
803 | } else { | |
804 | /* | |
805 | * We are opening a file that is still open in write, make | |
806 | * sure we limit our reading to the number of indexes | |
807 | * received. | |
808 | */ | |
809 | viewer_stream->close_write_flag = 0; | |
810 | if (stream) { | |
811 | viewer_stream->total_index_received = | |
812 | stream->total_index_received; | |
813 | } | |
814 | } | |
815 | viewer_stream->tracefile_count_current = tracefile_id; | |
d3e2ba59 | 816 | |
d1d66061 JD |
817 | ret = close(viewer_stream->index_read_fd); |
818 | if (ret < 0) { | |
819 | PERROR("close index file %d", | |
820 | viewer_stream->index_read_fd); | |
6b6b9a5a | 821 | } |
d1d66061 JD |
822 | viewer_stream->index_read_fd = -1; |
823 | ret = close(viewer_stream->read_fd); | |
824 | if (ret < 0) { | |
825 | PERROR("close tracefile %d", | |
826 | viewer_stream->read_fd); | |
827 | } | |
828 | viewer_stream->read_fd = -1; | |
829 | ||
830 | pthread_mutex_lock(&viewer_stream->overwrite_lock); | |
831 | viewer_stream->abort_flag = 0; | |
832 | pthread_mutex_unlock(&viewer_stream->overwrite_lock); | |
6b6b9a5a | 833 | |
cef0f7d5 | 834 | viewer_stream->index_read_fd = -1; |
6b6b9a5a JD |
835 | viewer_stream->read_fd = -1; |
836 | ||
cef0f7d5 JD |
837 | if (stream) { |
838 | pthread_mutex_unlock(&stream->viewer_stream_rotation_lock); | |
839 | } | |
6b6b9a5a JD |
840 | ret = open_index(viewer_stream); |
841 | if (ret < 0) { | |
842 | goto error; | |
843 | } | |
d3e2ba59 JD |
844 | |
845 | ret = 0; | |
846 | ||
a020f610 | 847 | end: |
d3e2ba59 JD |
848 | error: |
849 | return ret; | |
850 | } | |
851 | ||
852 | /* | |
853 | * Send the viewer the list of current sessions. | |
854 | */ | |
855 | static | |
856 | int viewer_attach_session(struct relay_command *cmd, | |
92c6ca54 | 857 | struct lttng_ht *sessions_ht) |
d3e2ba59 | 858 | { |
a4baae1b JD |
859 | int ret, send_streams = 0; |
860 | uint32_t nb_streams = 0, nb_streams_ready = 0; | |
d3e2ba59 JD |
861 | struct lttng_viewer_attach_session_request request; |
862 | struct lttng_viewer_attach_session_response response; | |
863 | struct lttng_viewer_stream send_stream; | |
864 | struct relay_stream *stream; | |
865 | struct relay_viewer_stream *viewer_stream; | |
866 | struct lttng_ht_node_ulong *node; | |
867 | struct lttng_ht_node_u64 *node64; | |
868 | struct lttng_ht_iter iter; | |
869 | struct relay_session *session; | |
0e6830aa | 870 | int seek_last = 0; |
d3e2ba59 JD |
871 | |
872 | assert(cmd); | |
873 | assert(sessions_ht); | |
d3e2ba59 JD |
874 | |
875 | DBG("Attach session received"); | |
876 | ||
877 | if (cmd->version_check_done == 0) { | |
878 | ERR("Trying to attach session before version check"); | |
879 | ret = -1; | |
880 | goto end_no_session; | |
881 | } | |
882 | ||
eea7556c MD |
883 | health_code_update(); |
884 | ||
d3e2ba59 JD |
885 | ret = cmd->sock->ops->recvmsg(cmd->sock, &request, sizeof(request), 0); |
886 | if (ret < 0 || ret != sizeof(request)) { | |
887 | if (ret == 0) { | |
888 | /* Orderly shutdown. Not necessary to print an error. */ | |
889 | DBG("Socket %d did an orderly shutdown", cmd->sock->fd); | |
890 | } else { | |
891 | ERR("Relay failed to receive the attach parameters."); | |
892 | } | |
893 | ret = -1; | |
894 | goto error; | |
895 | } | |
896 | ||
eea7556c MD |
897 | health_code_update(); |
898 | ||
d3e2ba59 JD |
899 | rcu_read_lock(); |
900 | lttng_ht_lookup(sessions_ht, | |
901 | (void *)((unsigned long) be64toh(request.session_id)), &iter); | |
902 | node = lttng_ht_iter_get_node_ulong(&iter); | |
903 | if (node == NULL) { | |
904 | DBG("Relay session %" PRIu64 " not found", | |
905 | be64toh(request.session_id)); | |
906 | response.status = htobe32(VIEWER_ATTACH_UNK); | |
907 | goto send_reply; | |
908 | } | |
909 | ||
910 | session = caa_container_of(node, struct relay_session, session_n); | |
b92fdc2b | 911 | if (cmd->session_id == session->id) { |
d3e2ba59 JD |
912 | /* Same viewer already attached, just send the stream list. */ |
913 | send_streams = 1; | |
914 | response.status = htobe32(VIEWER_ATTACH_OK); | |
915 | } else if (session->viewer_attached != 0) { | |
916 | DBG("Already a viewer attached"); | |
917 | response.status = htobe32(VIEWER_ATTACH_ALREADY); | |
918 | goto send_reply; | |
919 | } else if (session->live_timer == 0) { | |
920 | DBG("Not live session"); | |
921 | response.status = htobe32(VIEWER_ATTACH_NOT_LIVE); | |
922 | goto send_reply; | |
923 | } else { | |
924 | session->viewer_attached++; | |
925 | send_streams = 1; | |
926 | response.status = htobe32(VIEWER_ATTACH_OK); | |
b92fdc2b | 927 | cmd->session_id = session->id; |
d3e2ba59 JD |
928 | cmd->session = session; |
929 | } | |
930 | ||
931 | switch (be32toh(request.seek)) { | |
932 | case VIEWER_SEEK_BEGINNING: | |
933 | /* Default behaviour. */ | |
934 | break; | |
935 | case VIEWER_SEEK_LAST: | |
0e6830aa | 936 | seek_last = 1; |
d3e2ba59 JD |
937 | break; |
938 | default: | |
939 | ERR("Wrong seek parameter"); | |
940 | response.status = htobe32(VIEWER_ATTACH_SEEK_ERR); | |
941 | send_streams = 0; | |
942 | goto send_reply; | |
943 | } | |
944 | ||
945 | if (send_streams) { | |
946 | /* We should only be there if we have a session to attach to. */ | |
947 | assert(session); | |
948 | ||
949 | /* | |
950 | * Fill the viewer_streams_ht to count the number of streams | |
951 | * ready to be sent and avoid concurrency issues on the | |
952 | * relay_streams_ht and don't rely on a total session stream count. | |
953 | */ | |
954 | cds_lfht_for_each_entry(relay_streams_ht->ht, &iter.iter, node, node) { | |
955 | struct relay_viewer_stream *vstream; | |
956 | ||
eea7556c MD |
957 | health_code_update(); |
958 | ||
d3e2ba59 JD |
959 | node = lttng_ht_iter_get_node_ulong(&iter); |
960 | if (!node) { | |
961 | continue; | |
962 | } | |
963 | stream = caa_container_of(node, struct relay_stream, stream_n); | |
964 | if (stream->session != cmd->session) { | |
965 | continue; | |
966 | } | |
a4baae1b | 967 | nb_streams++; |
d3e2ba59 JD |
968 | |
969 | /* | |
a4baae1b JD |
970 | * Don't send streams with no ctf_trace, they are not |
971 | * ready to be read. | |
d3e2ba59 | 972 | */ |
a4baae1b | 973 | if (!stream->ctf_trace || !stream->viewer_ready) { |
d3e2ba59 JD |
974 | continue; |
975 | } | |
a4baae1b | 976 | nb_streams_ready++; |
d3e2ba59 | 977 | |
92c6ca54 | 978 | vstream = live_find_viewer_stream_by_id(stream->stream_handle); |
d3e2ba59 | 979 | if (!vstream) { |
0e6830aa | 980 | ret = init_viewer_stream(stream, seek_last); |
d3e2ba59 JD |
981 | if (ret < 0) { |
982 | goto end_unlock; | |
983 | } | |
984 | } | |
a4baae1b JD |
985 | } |
986 | ||
987 | /* We must have the same amount of existing stream and ready stream. */ | |
988 | if (nb_streams != nb_streams_ready) { | |
989 | nb_streams = 0; | |
d3e2ba59 JD |
990 | } |
991 | response.streams_count = htobe32(nb_streams); | |
992 | } | |
993 | ||
994 | send_reply: | |
eea7556c | 995 | health_code_update(); |
d3e2ba59 JD |
996 | ret = cmd->sock->ops->sendmsg(cmd->sock, &response, sizeof(response), 0); |
997 | if (ret < 0) { | |
998 | ERR("Relay sending viewer attach response"); | |
999 | goto end_unlock; | |
1000 | } | |
eea7556c | 1001 | health_code_update(); |
d3e2ba59 JD |
1002 | |
1003 | /* | |
157df586 | 1004 | * Unknown or empty session, just return gracefully, the viewer knows what |
d3e2ba59 JD |
1005 | * is happening. |
1006 | */ | |
157df586 | 1007 | if (!send_streams || !nb_streams) { |
d3e2ba59 JD |
1008 | ret = 0; |
1009 | goto end_unlock; | |
1010 | } | |
1011 | ||
1012 | /* We should only be there if we have a session to attach to. */ | |
1013 | assert(session); | |
1014 | cds_lfht_for_each_entry(viewer_streams_ht->ht, &iter.iter, node, node) { | |
eea7556c MD |
1015 | health_code_update(); |
1016 | ||
d3e2ba59 JD |
1017 | node64 = lttng_ht_iter_get_node_u64(&iter); |
1018 | if (!node64) { | |
1019 | continue; | |
1020 | } | |
1021 | viewer_stream = caa_container_of(node64, struct relay_viewer_stream, | |
1022 | stream_n); | |
1023 | if (viewer_stream->session_id != cmd->session->id) { | |
1024 | continue; | |
1025 | } | |
1026 | ||
1027 | send_stream.id = htobe64(viewer_stream->stream_handle); | |
1028 | send_stream.ctf_trace_id = htobe64(viewer_stream->ctf_trace->id); | |
1029 | send_stream.metadata_flag = htobe32(viewer_stream->metadata_flag); | |
1030 | strncpy(send_stream.path_name, viewer_stream->path_name, | |
1031 | sizeof(send_stream.path_name)); | |
1032 | strncpy(send_stream.channel_name, viewer_stream->channel_name, | |
1033 | sizeof(send_stream.channel_name)); | |
1034 | ||
1035 | ret = cmd->sock->ops->sendmsg(cmd->sock, &send_stream, | |
1036 | sizeof(send_stream), 0); | |
1037 | if (ret < 0) { | |
1038 | ERR("Relay sending stream %" PRIu64, viewer_stream->stream_handle); | |
1039 | goto end_unlock; | |
1040 | } | |
1041 | DBG("Sent stream %" PRIu64 " to viewer", viewer_stream->stream_handle); | |
1042 | } | |
1043 | ret = 0; | |
1044 | ||
1045 | end_unlock: | |
1046 | rcu_read_unlock(); | |
1047 | end_no_session: | |
1048 | error: | |
1049 | return ret; | |
1050 | } | |
1051 | ||
d3e2ba59 JD |
1052 | /* |
1053 | * Get viewer stream from stream id. | |
1054 | * | |
1055 | * RCU read side lock MUST be acquired. | |
1056 | */ | |
92c6ca54 | 1057 | struct relay_viewer_stream *live_find_viewer_stream_by_id(uint64_t stream_id) |
d3e2ba59 JD |
1058 | { |
1059 | struct lttng_ht_node_u64 *node; | |
1060 | struct lttng_ht_iter iter; | |
1061 | struct relay_viewer_stream *stream = NULL; | |
1062 | ||
d3e2ba59 JD |
1063 | lttng_ht_lookup(viewer_streams_ht, &stream_id, &iter); |
1064 | node = lttng_ht_iter_get_node_u64(&iter); | |
1065 | if (node == NULL) { | |
1066 | DBG("Relay viewer stream %" PRIu64 " not found", stream_id); | |
1067 | goto end; | |
1068 | } | |
1069 | stream = caa_container_of(node, struct relay_viewer_stream, stream_n); | |
1070 | ||
1071 | end: | |
1072 | return stream; | |
1073 | } | |
1074 | ||
157df586 JD |
1075 | static |
1076 | void deferred_free_viewer_stream(struct rcu_head *head) | |
1077 | { | |
1078 | struct relay_viewer_stream *stream = | |
1079 | caa_container_of(head, struct relay_viewer_stream, rcu_node); | |
1080 | ||
1081 | free(stream->path_name); | |
1082 | free(stream->channel_name); | |
1083 | free(stream); | |
1084 | } | |
1085 | ||
1086 | static | |
1087 | void delete_viewer_stream(struct relay_viewer_stream *vstream) | |
1088 | { | |
1089 | int delret; | |
1090 | struct lttng_ht_iter iter; | |
1091 | ||
1092 | iter.iter.node = &vstream->stream_n.node; | |
1093 | delret = lttng_ht_del(viewer_streams_ht, &iter); | |
1094 | assert(!delret); | |
1095 | } | |
1096 | ||
1097 | static | |
1098 | void destroy_viewer_stream(struct relay_viewer_stream *vstream) | |
1099 | { | |
1100 | unsigned long ret_ref; | |
1101 | int ret; | |
1102 | ||
1103 | assert(vstream); | |
1104 | ret_ref = uatomic_add_return(&vstream->ctf_trace->refcount, -1); | |
1105 | assert(ret_ref >= 0); | |
1106 | ||
1107 | if (vstream->read_fd >= 0) { | |
1108 | ret = close(vstream->read_fd); | |
1109 | if (ret < 0) { | |
1110 | PERROR("close read_fd"); | |
1111 | } | |
1112 | } | |
1113 | if (vstream->index_read_fd >= 0) { | |
1114 | ret = close(vstream->index_read_fd); | |
1115 | if (ret < 0) { | |
1116 | PERROR("close index_read_fd"); | |
1117 | } | |
1118 | } | |
1119 | ||
1120 | /* | |
1121 | * If the only stream left in the HT is the metadata stream, | |
1122 | * we need to remove it because we won't detect a EOF for this | |
1123 | * stream. | |
1124 | */ | |
efe12ccc | 1125 | if (ret_ref == 1 && vstream->ctf_trace->viewer_metadata_stream) { |
26f003c3 | 1126 | delete_viewer_stream(vstream->ctf_trace->viewer_metadata_stream); |
157df586 JD |
1127 | destroy_viewer_stream(vstream->ctf_trace->viewer_metadata_stream); |
1128 | vstream->ctf_trace->metadata_stream = NULL; | |
1129 | DBG("Freeing ctf_trace %" PRIu64, vstream->ctf_trace->id); | |
1130 | /* | |
1131 | * The streaming-side is already closed and we can't receive a new | |
1132 | * stream concurrently at this point (since the session is being | |
1133 | * destroyed), so when we detect the refcount equals 0, we are the | |
1134 | * only owners of the ctf_trace and we can free it ourself. | |
1135 | */ | |
1136 | free(vstream->ctf_trace); | |
1137 | } | |
1138 | ||
1139 | call_rcu(&vstream->rcu_node, deferred_free_viewer_stream); | |
1140 | } | |
1141 | ||
d3e2ba59 JD |
1142 | /* |
1143 | * Send the next index for a stream. | |
1144 | * | |
1145 | * Return 0 on success or else a negative value. | |
1146 | */ | |
1147 | static | |
1148 | int viewer_get_next_index(struct relay_command *cmd, | |
92c6ca54 | 1149 | struct lttng_ht *sessions_ht) |
d3e2ba59 JD |
1150 | { |
1151 | int ret; | |
1152 | struct lttng_viewer_get_next_index request_index; | |
1153 | struct lttng_viewer_index viewer_index; | |
50adc264 | 1154 | struct ctf_packet_index packet_index; |
d3e2ba59 JD |
1155 | struct relay_viewer_stream *vstream; |
1156 | struct relay_stream *rstream; | |
1157 | ||
1158 | assert(cmd); | |
d3e2ba59 JD |
1159 | assert(sessions_ht); |
1160 | ||
1161 | DBG("Viewer get next index"); | |
1162 | ||
1163 | if (cmd->version_check_done == 0) { | |
1164 | ERR("Trying to request index before version check"); | |
1165 | ret = -1; | |
1166 | goto end_no_session; | |
1167 | } | |
1168 | ||
eea7556c | 1169 | health_code_update(); |
d3e2ba59 JD |
1170 | ret = cmd->sock->ops->recvmsg(cmd->sock, &request_index, |
1171 | sizeof(request_index), 0); | |
1172 | if (ret < 0 || ret != sizeof(request_index)) { | |
1173 | ret = -1; | |
1174 | ERR("Relay didn't receive the whole packet"); | |
1175 | goto end; | |
1176 | } | |
eea7556c | 1177 | health_code_update(); |
d3e2ba59 JD |
1178 | |
1179 | rcu_read_lock(); | |
92c6ca54 | 1180 | vstream = live_find_viewer_stream_by_id(be64toh(request_index.stream_id)); |
d3e2ba59 JD |
1181 | if (!vstream) { |
1182 | ret = -1; | |
1183 | goto end_unlock; | |
1184 | } | |
1185 | ||
1186 | memset(&viewer_index, 0, sizeof(viewer_index)); | |
1187 | ||
1188 | /* | |
1189 | * The viewer should not ask for index on metadata stream. | |
1190 | */ | |
1191 | if (vstream->metadata_flag) { | |
1192 | viewer_index.status = htobe32(VIEWER_INDEX_HUP); | |
1193 | goto send_reply; | |
1194 | } | |
1195 | ||
1196 | /* First time, we open the index file */ | |
1197 | if (vstream->index_read_fd < 0) { | |
1198 | ret = open_index(vstream); | |
0e6830aa | 1199 | if (ret == -ENOENT) { |
d3e2ba59 JD |
1200 | /* |
1201 | * The index is created only when the first data packet arrives, it | |
1202 | * might not be ready at the beginning of the session | |
1203 | */ | |
1204 | viewer_index.status = htobe32(VIEWER_INDEX_RETRY); | |
1205 | goto send_reply; | |
1206 | } else if (ret < 0) { | |
1207 | viewer_index.status = htobe32(VIEWER_INDEX_ERR); | |
1208 | goto send_reply; | |
1209 | } | |
1210 | } | |
1211 | ||
1212 | rstream = relay_stream_find_by_id(vstream->stream_handle); | |
1213 | if (rstream) { | |
6b6b9a5a JD |
1214 | if (vstream->abort_flag) { |
1215 | /* Rotate on abort (overwrite). */ | |
1216 | DBG("Viewer rotate because of overwrite"); | |
1217 | ret = rotate_viewer_stream(vstream, rstream); | |
1218 | if (ret < 0) { | |
1219 | goto end_unlock; | |
a020f610 JD |
1220 | } else if (ret == 1) { |
1221 | viewer_index.status = htobe32(VIEWER_INDEX_HUP); | |
157df586 JD |
1222 | delete_viewer_stream(vstream); |
1223 | destroy_viewer_stream(vstream); | |
a020f610 | 1224 | goto send_reply; |
6b6b9a5a JD |
1225 | } |
1226 | } | |
6b6b9a5a | 1227 | pthread_mutex_lock(&rstream->viewer_stream_rotation_lock); |
cef0f7d5 JD |
1228 | if (rstream->tracefile_count_current == vstream->tracefile_count_current) { |
1229 | if (rstream->beacon_ts_end != -1ULL && | |
1230 | vstream->last_sent_index == rstream->total_index_received) { | |
1231 | viewer_index.status = htobe32(VIEWER_INDEX_INACTIVE); | |
1232 | viewer_index.timestamp_end = htobe64(rstream->beacon_ts_end); | |
1233 | pthread_mutex_unlock(&rstream->viewer_stream_rotation_lock); | |
1234 | goto send_reply; | |
1235 | /* | |
1236 | * Reader and writer are working in the same tracefile, so we care | |
1237 | * about the number of index received and sent. Otherwise, we read | |
1238 | * up to EOF. | |
1239 | */ | |
1240 | } else if (rstream->total_index_received <= vstream->last_sent_index | |
1241 | && !vstream->close_write_flag) { | |
1242 | pthread_mutex_unlock(&rstream->viewer_stream_rotation_lock); | |
1243 | /* No new index to send, retry later. */ | |
1244 | viewer_index.status = htobe32(VIEWER_INDEX_RETRY); | |
1245 | goto send_reply; | |
1246 | } | |
d3e2ba59 | 1247 | } |
6b6b9a5a JD |
1248 | pthread_mutex_unlock(&rstream->viewer_stream_rotation_lock); |
1249 | } else if (!rstream && vstream->close_write_flag && | |
d3e2ba59 | 1250 | vstream->total_index_received == vstream->last_sent_index) { |
6b6b9a5a | 1251 | /* Last index sent and current tracefile closed in write */ |
d3e2ba59 | 1252 | viewer_index.status = htobe32(VIEWER_INDEX_HUP); |
157df586 JD |
1253 | delete_viewer_stream(vstream); |
1254 | destroy_viewer_stream(vstream); | |
d3e2ba59 | 1255 | goto send_reply; |
6b6b9a5a JD |
1256 | } else { |
1257 | vstream->close_write_flag = 1; | |
d3e2ba59 JD |
1258 | } |
1259 | ||
1260 | if (!vstream->ctf_trace->metadata_received || | |
1261 | vstream->ctf_trace->metadata_received > | |
1262 | vstream->ctf_trace->metadata_sent) { | |
1263 | viewer_index.flags |= LTTNG_VIEWER_FLAG_NEW_METADATA; | |
1264 | } | |
1265 | ||
cef0f7d5 JD |
1266 | pthread_mutex_lock(&vstream->overwrite_lock); |
1267 | if (vstream->abort_flag) { | |
1268 | /* | |
1269 | * The file is being overwritten by the writer, we cannot | |
1270 | * use it. | |
1271 | */ | |
1272 | viewer_index.status = htobe32(VIEWER_INDEX_RETRY); | |
1273 | pthread_mutex_unlock(&vstream->overwrite_lock); | |
1274 | ret = rotate_viewer_stream(vstream, rstream); | |
1275 | if (ret < 0) { | |
1276 | goto end_unlock; | |
a020f610 JD |
1277 | } else if (ret == 1) { |
1278 | viewer_index.status = htobe32(VIEWER_INDEX_HUP); | |
157df586 JD |
1279 | delete_viewer_stream(vstream); |
1280 | destroy_viewer_stream(vstream); | |
a020f610 | 1281 | goto send_reply; |
cef0f7d5 JD |
1282 | } |
1283 | goto send_reply; | |
1284 | } | |
6cd525e8 MD |
1285 | ret = lttng_read(vstream->index_read_fd, &packet_index, |
1286 | sizeof(packet_index)); | |
cef0f7d5 | 1287 | pthread_mutex_unlock(&vstream->overwrite_lock); |
d3e2ba59 | 1288 | if (ret < sizeof(packet_index)) { |
6b6b9a5a JD |
1289 | /* |
1290 | * The tracefile is closed in write, so we read up to EOF. | |
1291 | */ | |
1292 | if (vstream->close_write_flag == 1) { | |
1293 | viewer_index.status = htobe32(VIEWER_INDEX_RETRY); | |
1294 | /* Rotate on normal EOF */ | |
1295 | ret = rotate_viewer_stream(vstream, rstream); | |
1296 | if (ret < 0) { | |
1297 | goto end_unlock; | |
a020f610 JD |
1298 | } else if (ret == 1) { |
1299 | viewer_index.status = htobe32(VIEWER_INDEX_HUP); | |
157df586 JD |
1300 | delete_viewer_stream(vstream); |
1301 | destroy_viewer_stream(vstream); | |
a020f610 | 1302 | goto send_reply; |
6b6b9a5a JD |
1303 | } |
1304 | } else { | |
cef0f7d5 JD |
1305 | PERROR("Relay reading index file %d", |
1306 | vstream->index_read_fd); | |
1307 | viewer_index.status = htobe32(VIEWER_INDEX_ERR); | |
6b6b9a5a JD |
1308 | } |
1309 | goto send_reply; | |
d3e2ba59 JD |
1310 | } else { |
1311 | viewer_index.status = htobe32(VIEWER_INDEX_OK); | |
1312 | vstream->last_sent_index++; | |
1313 | } | |
1314 | ||
1315 | /* | |
1316 | * Indexes are stored in big endian, no need to switch before sending. | |
1317 | */ | |
1318 | viewer_index.offset = packet_index.offset; | |
1319 | viewer_index.packet_size = packet_index.packet_size; | |
1320 | viewer_index.content_size = packet_index.content_size; | |
1321 | viewer_index.timestamp_begin = packet_index.timestamp_begin; | |
1322 | viewer_index.timestamp_end = packet_index.timestamp_end; | |
1323 | viewer_index.events_discarded = packet_index.events_discarded; | |
1324 | viewer_index.stream_id = packet_index.stream_id; | |
1325 | ||
1326 | send_reply: | |
1327 | viewer_index.flags = htobe32(viewer_index.flags); | |
eea7556c | 1328 | health_code_update(); |
d3e2ba59 JD |
1329 | ret = cmd->sock->ops->sendmsg(cmd->sock, &viewer_index, |
1330 | sizeof(viewer_index), 0); | |
1331 | if (ret < 0) { | |
1332 | ERR("Relay index to viewer"); | |
1333 | goto end_unlock; | |
1334 | } | |
eea7556c | 1335 | health_code_update(); |
d3e2ba59 JD |
1336 | |
1337 | DBG("Index %" PRIu64 "for stream %" PRIu64 "sent", | |
1338 | vstream->last_sent_index, vstream->stream_handle); | |
1339 | ||
1340 | end_unlock: | |
1341 | rcu_read_unlock(); | |
1342 | ||
1343 | end_no_session: | |
1344 | end: | |
1345 | return ret; | |
1346 | } | |
1347 | ||
1348 | /* | |
1349 | * Send the next index for a stream | |
1350 | * | |
1351 | * Return 0 on success or else a negative value. | |
1352 | */ | |
1353 | static | |
92c6ca54 | 1354 | int viewer_get_packet(struct relay_command *cmd) |
d3e2ba59 JD |
1355 | { |
1356 | int ret, send_data = 0; | |
1357 | char *data = NULL; | |
1358 | uint32_t len = 0; | |
1359 | ssize_t read_len; | |
1360 | struct lttng_viewer_get_packet get_packet_info; | |
1361 | struct lttng_viewer_trace_packet reply; | |
1362 | struct relay_viewer_stream *stream; | |
1363 | ||
1364 | assert(cmd); | |
d3e2ba59 JD |
1365 | |
1366 | DBG2("Relay get data packet"); | |
1367 | ||
1368 | if (cmd->version_check_done == 0) { | |
1369 | ERR("Trying to get packet before version check"); | |
1370 | ret = -1; | |
1371 | goto end; | |
1372 | } | |
1373 | ||
eea7556c | 1374 | health_code_update(); |
d3e2ba59 JD |
1375 | ret = cmd->sock->ops->recvmsg(cmd->sock, &get_packet_info, |
1376 | sizeof(get_packet_info), 0); | |
1377 | if (ret < 0 || ret != sizeof(get_packet_info)) { | |
1378 | ret = -1; | |
1379 | ERR("Relay didn't receive the whole packet"); | |
1380 | goto end; | |
1381 | } | |
eea7556c | 1382 | health_code_update(); |
d3e2ba59 | 1383 | |
0233a6a5 DG |
1384 | /* From this point on, the error label can be reached. */ |
1385 | memset(&reply, 0, sizeof(reply)); | |
1386 | ||
d3e2ba59 | 1387 | rcu_read_lock(); |
92c6ca54 | 1388 | stream = live_find_viewer_stream_by_id(be64toh(get_packet_info.stream_id)); |
d3e2ba59 JD |
1389 | if (!stream) { |
1390 | goto error; | |
1391 | } | |
1392 | assert(stream->ctf_trace); | |
1393 | ||
1394 | /* | |
1395 | * First time we read this stream, we need open the tracefile, we should | |
1396 | * only arrive here if an index has already been sent to the viewer, so the | |
1397 | * tracefile must exist, if it does not it is a fatal error. | |
1398 | */ | |
1399 | if (stream->read_fd < 0) { | |
1400 | char fullpath[PATH_MAX]; | |
1401 | ||
6b6b9a5a JD |
1402 | if (stream->tracefile_count > 0) { |
1403 | ret = snprintf(fullpath, PATH_MAX, "%s/%s_%" PRIu64, stream->path_name, | |
1404 | stream->channel_name, | |
1405 | stream->tracefile_count_current); | |
1406 | } else { | |
1407 | ret = snprintf(fullpath, PATH_MAX, "%s/%s", stream->path_name, | |
1408 | stream->channel_name); | |
1409 | } | |
d3e2ba59 JD |
1410 | if (ret < 0) { |
1411 | goto error; | |
1412 | } | |
1413 | ret = open(fullpath, O_RDONLY); | |
1414 | if (ret < 0) { | |
1415 | PERROR("Relay opening trace file"); | |
1416 | goto error; | |
1417 | } | |
1418 | stream->read_fd = ret; | |
1419 | } | |
1420 | ||
d3e2ba59 JD |
1421 | if (!stream->ctf_trace->metadata_received || |
1422 | stream->ctf_trace->metadata_received > | |
1423 | stream->ctf_trace->metadata_sent) { | |
1424 | reply.status = htobe32(VIEWER_GET_PACKET_ERR); | |
1425 | reply.flags |= LTTNG_VIEWER_FLAG_NEW_METADATA; | |
d3e2ba59 JD |
1426 | goto send_reply; |
1427 | } | |
1428 | ||
1429 | len = be32toh(get_packet_info.len); | |
1430 | data = zmalloc(len); | |
1431 | if (!data) { | |
1432 | PERROR("relay data zmalloc"); | |
1433 | goto error; | |
1434 | } | |
1435 | ||
1436 | ret = lseek(stream->read_fd, be64toh(get_packet_info.offset), SEEK_SET); | |
1437 | if (ret < 0) { | |
6b6b9a5a JD |
1438 | /* |
1439 | * If the read fd was closed by the streaming side, the | |
1440 | * abort_flag will be set to 1, otherwise it is an error. | |
1441 | */ | |
1442 | if (stream->abort_flag == 0) { | |
1443 | PERROR("lseek"); | |
1444 | goto error; | |
1445 | } | |
1446 | reply.status = htobe32(VIEWER_GET_PACKET_EOF); | |
1447 | goto send_reply; | |
d3e2ba59 | 1448 | } |
6cd525e8 MD |
1449 | read_len = lttng_read(stream->read_fd, data, len); |
1450 | if (read_len < len) { | |
6b6b9a5a JD |
1451 | /* |
1452 | * If the read fd was closed by the streaming side, the | |
1453 | * abort_flag will be set to 1, otherwise it is an error. | |
1454 | */ | |
1455 | if (stream->abort_flag == 0) { | |
1456 | PERROR("Relay reading trace file, fd: %d, offset: %" PRIu64, | |
1457 | stream->read_fd, | |
1458 | be64toh(get_packet_info.offset)); | |
1459 | goto error; | |
1460 | } else { | |
1461 | reply.status = htobe32(VIEWER_GET_PACKET_EOF); | |
1462 | goto send_reply; | |
1463 | } | |
d3e2ba59 JD |
1464 | } |
1465 | reply.status = htobe32(VIEWER_GET_PACKET_OK); | |
1466 | reply.len = htobe32(len); | |
1467 | send_data = 1; | |
1468 | goto send_reply; | |
1469 | ||
1470 | error: | |
1471 | reply.status = htobe32(VIEWER_GET_PACKET_ERR); | |
1472 | ||
1473 | send_reply: | |
1474 | reply.flags = htobe32(reply.flags); | |
eea7556c MD |
1475 | |
1476 | health_code_update(); | |
d3e2ba59 JD |
1477 | ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, sizeof(reply), 0); |
1478 | if (ret < 0) { | |
1479 | ERR("Relay data header to viewer"); | |
1480 | goto end_unlock; | |
1481 | } | |
eea7556c | 1482 | health_code_update(); |
d3e2ba59 JD |
1483 | |
1484 | if (send_data) { | |
eea7556c | 1485 | health_code_update(); |
d3e2ba59 JD |
1486 | ret = cmd->sock->ops->sendmsg(cmd->sock, data, len, 0); |
1487 | if (ret < 0) { | |
1488 | ERR("Relay send data to viewer"); | |
1489 | goto end_unlock; | |
1490 | } | |
eea7556c | 1491 | health_code_update(); |
d3e2ba59 JD |
1492 | } |
1493 | ||
1494 | DBG("Sent %u bytes for stream %" PRIu64, len, | |
1495 | be64toh(get_packet_info.stream_id)); | |
1496 | ||
1497 | end_unlock: | |
1498 | free(data); | |
1499 | rcu_read_unlock(); | |
1500 | ||
1501 | end: | |
1502 | return ret; | |
1503 | } | |
1504 | ||
1505 | /* | |
1506 | * Send the session's metadata | |
1507 | * | |
1508 | * Return 0 on success else a negative value. | |
1509 | */ | |
1510 | static | |
92c6ca54 | 1511 | int viewer_get_metadata(struct relay_command *cmd) |
d3e2ba59 JD |
1512 | { |
1513 | int ret = 0; | |
1514 | ssize_t read_len; | |
1515 | uint64_t len = 0; | |
1516 | char *data = NULL; | |
1517 | struct lttng_viewer_get_metadata request; | |
1518 | struct lttng_viewer_metadata_packet reply; | |
1519 | struct relay_viewer_stream *stream; | |
1520 | ||
1521 | assert(cmd); | |
d3e2ba59 JD |
1522 | |
1523 | DBG("Relay get metadata"); | |
1524 | ||
1525 | if (cmd->version_check_done == 0) { | |
1526 | ERR("Trying to get metadata before version check"); | |
1527 | ret = -1; | |
1528 | goto end; | |
1529 | } | |
1530 | ||
eea7556c | 1531 | health_code_update(); |
d3e2ba59 JD |
1532 | ret = cmd->sock->ops->recvmsg(cmd->sock, &request, |
1533 | sizeof(request), 0); | |
1534 | if (ret < 0 || ret != sizeof(request)) { | |
1535 | ret = -1; | |
1536 | ERR("Relay didn't receive the whole packet"); | |
1537 | goto end; | |
1538 | } | |
eea7556c | 1539 | health_code_update(); |
d3e2ba59 JD |
1540 | |
1541 | rcu_read_lock(); | |
92c6ca54 | 1542 | stream = live_find_viewer_stream_by_id(be64toh(request.stream_id)); |
d3e2ba59 JD |
1543 | if (!stream || !stream->metadata_flag) { |
1544 | ERR("Invalid metadata stream"); | |
1545 | goto error; | |
1546 | } | |
1547 | assert(stream->ctf_trace); | |
1548 | assert(stream->ctf_trace->metadata_sent <= | |
1549 | stream->ctf_trace->metadata_received); | |
1550 | ||
1551 | len = stream->ctf_trace->metadata_received - | |
1552 | stream->ctf_trace->metadata_sent; | |
1553 | if (len == 0) { | |
1554 | reply.status = htobe32(VIEWER_NO_NEW_METADATA); | |
1555 | goto send_reply; | |
1556 | } | |
1557 | ||
1558 | /* first time, we open the metadata file */ | |
1559 | if (stream->read_fd < 0) { | |
1560 | char fullpath[PATH_MAX]; | |
1561 | ||
1562 | ret = snprintf(fullpath, PATH_MAX, "%s/%s", stream->path_name, | |
1563 | stream->channel_name); | |
1564 | if (ret < 0) { | |
1565 | goto error; | |
1566 | } | |
1567 | ret = open(fullpath, O_RDONLY); | |
1568 | if (ret < 0) { | |
1569 | PERROR("Relay opening metadata file"); | |
1570 | goto error; | |
1571 | } | |
1572 | stream->read_fd = ret; | |
1573 | } | |
1574 | ||
1575 | reply.len = htobe64(len); | |
1576 | data = zmalloc(len); | |
1577 | if (!data) { | |
1578 | PERROR("viewer metadata zmalloc"); | |
1579 | goto error; | |
1580 | } | |
1581 | ||
6cd525e8 MD |
1582 | read_len = lttng_read(stream->read_fd, data, len); |
1583 | if (read_len < len) { | |
d3e2ba59 JD |
1584 | PERROR("Relay reading metadata file"); |
1585 | goto error; | |
1586 | } | |
1587 | stream->ctf_trace->metadata_sent += read_len; | |
1588 | reply.status = htobe32(VIEWER_METADATA_OK); | |
1589 | goto send_reply; | |
1590 | ||
1591 | error: | |
1592 | reply.status = htobe32(VIEWER_METADATA_ERR); | |
1593 | ||
1594 | send_reply: | |
eea7556c | 1595 | health_code_update(); |
d3e2ba59 JD |
1596 | ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, sizeof(reply), 0); |
1597 | if (ret < 0) { | |
1598 | ERR("Relay data header to viewer"); | |
1599 | goto end_unlock; | |
1600 | } | |
eea7556c | 1601 | health_code_update(); |
d3e2ba59 JD |
1602 | |
1603 | if (len > 0) { | |
1604 | ret = cmd->sock->ops->sendmsg(cmd->sock, data, len, 0); | |
1605 | if (ret < 0) { | |
1606 | ERR("Relay send data to viewer"); | |
1607 | goto end_unlock; | |
1608 | } | |
1609 | } | |
1610 | ||
1611 | DBG("Sent %" PRIu64 " bytes of metadata for stream %" PRIu64, len, | |
1612 | be64toh(request.stream_id)); | |
1613 | ||
1614 | DBG("Metadata sent"); | |
1615 | ||
1616 | end_unlock: | |
1617 | free(data); | |
1618 | rcu_read_unlock(); | |
1619 | end: | |
1620 | return ret; | |
1621 | } | |
1622 | ||
1623 | /* | |
1624 | * live_relay_unknown_command: send -1 if received unknown command | |
1625 | */ | |
1626 | static | |
1627 | void live_relay_unknown_command(struct relay_command *cmd) | |
1628 | { | |
1629 | struct lttcomm_relayd_generic_reply reply; | |
1630 | int ret; | |
1631 | ||
1632 | reply.ret_code = htobe32(LTTNG_ERR_UNK); | |
1633 | ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, | |
1634 | sizeof(struct lttcomm_relayd_generic_reply), 0); | |
1635 | if (ret < 0) { | |
1636 | ERR("Relay sending unknown command"); | |
1637 | } | |
1638 | } | |
1639 | ||
1640 | /* | |
1641 | * Process the commands received on the control socket | |
1642 | */ | |
1643 | static | |
1644 | int process_control(struct lttng_viewer_cmd *recv_hdr, | |
92c6ca54 | 1645 | struct relay_command *cmd, struct lttng_ht *sessions_ht) |
d3e2ba59 JD |
1646 | { |
1647 | int ret = 0; | |
1648 | ||
1649 | switch (be32toh(recv_hdr->cmd)) { | |
1650 | case VIEWER_CONNECT: | |
1651 | ret = viewer_connect(cmd); | |
1652 | break; | |
1653 | case VIEWER_LIST_SESSIONS: | |
1654 | ret = viewer_list_sessions(cmd, sessions_ht); | |
1655 | break; | |
1656 | case VIEWER_ATTACH_SESSION: | |
92c6ca54 | 1657 | ret = viewer_attach_session(cmd, sessions_ht); |
d3e2ba59 JD |
1658 | break; |
1659 | case VIEWER_GET_NEXT_INDEX: | |
92c6ca54 | 1660 | ret = viewer_get_next_index(cmd, sessions_ht); |
d3e2ba59 JD |
1661 | break; |
1662 | case VIEWER_GET_PACKET: | |
92c6ca54 | 1663 | ret = viewer_get_packet(cmd); |
d3e2ba59 JD |
1664 | break; |
1665 | case VIEWER_GET_METADATA: | |
92c6ca54 | 1666 | ret = viewer_get_metadata(cmd); |
d3e2ba59 JD |
1667 | break; |
1668 | default: | |
1669 | ERR("Received unknown viewer command (%u)", be32toh(recv_hdr->cmd)); | |
1670 | live_relay_unknown_command(cmd); | |
1671 | ret = -1; | |
1672 | goto end; | |
1673 | } | |
1674 | ||
1675 | end: | |
1676 | return ret; | |
1677 | } | |
1678 | ||
1679 | static | |
1680 | void cleanup_poll_connection(struct lttng_poll_event *events, int pollfd) | |
1681 | { | |
1682 | int ret; | |
1683 | ||
1684 | assert(events); | |
1685 | ||
1686 | lttng_poll_del(events, pollfd); | |
1687 | ||
1688 | ret = close(pollfd); | |
1689 | if (ret < 0) { | |
1690 | ERR("Closing pollfd %d", pollfd); | |
1691 | } | |
1692 | } | |
1693 | ||
1694 | /* | |
1695 | * Create and add connection to the given hash table. | |
1696 | * | |
1697 | * Return poll add value or else -1 on error. | |
1698 | */ | |
1699 | static | |
1700 | int add_connection(int fd, struct lttng_poll_event *events, | |
1701 | struct lttng_ht *relay_connections_ht) | |
1702 | { | |
1703 | int ret; | |
1704 | struct relay_command *relay_connection; | |
1705 | ||
1706 | assert(events); | |
1707 | assert(relay_connections_ht); | |
1708 | ||
1709 | relay_connection = zmalloc(sizeof(struct relay_command)); | |
1710 | if (relay_connection == NULL) { | |
1711 | PERROR("Relay command zmalloc"); | |
1712 | goto error; | |
1713 | } | |
1714 | ||
6cd525e8 MD |
1715 | ret = lttng_read(fd, relay_connection, sizeof(*relay_connection)); |
1716 | if (ret < sizeof(*relay_connection)) { | |
d3e2ba59 JD |
1717 | PERROR("read relay cmd pipe"); |
1718 | goto error_read; | |
1719 | } | |
1720 | ||
1721 | lttng_ht_node_init_ulong(&relay_connection->sock_n, | |
1722 | (unsigned long) relay_connection->sock->fd); | |
1723 | rcu_read_lock(); | |
1724 | lttng_ht_add_unique_ulong(relay_connections_ht, | |
1725 | &relay_connection->sock_n); | |
1726 | rcu_read_unlock(); | |
1727 | ||
1728 | return lttng_poll_add(events, relay_connection->sock->fd, | |
1729 | LPOLLIN | LPOLLRDHUP); | |
1730 | ||
1731 | error_read: | |
1732 | free(relay_connection); | |
1733 | error: | |
1734 | return -1; | |
1735 | } | |
1736 | ||
1737 | static | |
1738 | void deferred_free_connection(struct rcu_head *head) | |
1739 | { | |
1740 | struct relay_command *relay_connection = | |
1741 | caa_container_of(head, struct relay_command, rcu_node); | |
1742 | ||
1743 | if (relay_connection->session && | |
1744 | relay_connection->session->viewer_attached > 0) { | |
1745 | relay_connection->session->viewer_attached--; | |
1746 | } | |
1747 | lttcomm_destroy_sock(relay_connection->sock); | |
1748 | free(relay_connection); | |
1749 | } | |
1750 | ||
157df586 JD |
1751 | /* |
1752 | * Delete all streams for a specific session ID. | |
1753 | */ | |
d3e2ba59 | 1754 | static |
b92fdc2b | 1755 | void viewer_del_streams(uint64_t session_id) |
d3e2ba59 | 1756 | { |
d3e2ba59 | 1757 | struct relay_viewer_stream *stream; |
d3e2ba59 JD |
1758 | struct lttng_ht_iter iter; |
1759 | ||
d3e2ba59 | 1760 | rcu_read_lock(); |
157df586 JD |
1761 | cds_lfht_for_each_entry(viewer_streams_ht->ht, &iter.iter, stream, |
1762 | stream_n.node) { | |
eea7556c MD |
1763 | health_code_update(); |
1764 | ||
b92fdc2b | 1765 | if (stream->session_id != session_id) { |
d3e2ba59 JD |
1766 | continue; |
1767 | } | |
1768 | ||
157df586 JD |
1769 | delete_viewer_stream(stream); |
1770 | assert(stream->ctf_trace); | |
1771 | ||
1772 | if (stream->metadata_flag) { | |
1773 | /* | |
1774 | * The metadata viewer stream is destroyed once the refcount on the | |
1775 | * ctf trace goes to 0 in the destroy stream function thus there is | |
1776 | * no explicit call to that function here. | |
1777 | */ | |
d3e2ba59 | 1778 | stream->ctf_trace->metadata_sent = 0; |
157df586 JD |
1779 | stream->ctf_trace->viewer_metadata_stream = NULL; |
1780 | } else { | |
1781 | destroy_viewer_stream(stream); | |
d3e2ba59 | 1782 | } |
d3e2ba59 JD |
1783 | } |
1784 | rcu_read_unlock(); | |
1785 | } | |
1786 | ||
1787 | /* | |
1788 | * Delete and free a connection. | |
1789 | * | |
1790 | * RCU read side lock MUST be acquired. | |
1791 | */ | |
1792 | static | |
1793 | void del_connection(struct lttng_ht *relay_connections_ht, | |
92c6ca54 | 1794 | struct lttng_ht_iter *iter, struct relay_command *relay_connection) |
d3e2ba59 JD |
1795 | { |
1796 | int ret; | |
1797 | ||
1798 | assert(relay_connections_ht); | |
1799 | assert(iter); | |
1800 | assert(relay_connection); | |
d3e2ba59 | 1801 | |
157df586 JD |
1802 | DBG("Cleaning connection of session ID %" PRIu64, |
1803 | relay_connection->session_id); | |
1804 | ||
d3e2ba59 JD |
1805 | ret = lttng_ht_del(relay_connections_ht, iter); |
1806 | assert(!ret); | |
1807 | ||
b92fdc2b | 1808 | viewer_del_streams(relay_connection->session_id); |
d3e2ba59 JD |
1809 | |
1810 | call_rcu(&relay_connection->rcu_node, deferred_free_connection); | |
1811 | } | |
1812 | ||
1813 | /* | |
1814 | * This thread does the actual work | |
1815 | */ | |
1816 | static | |
1817 | void *thread_worker(void *data) | |
1818 | { | |
1819 | int ret, err = -1; | |
1820 | uint32_t nb_fd; | |
1821 | struct relay_command *relay_connection; | |
1822 | struct lttng_poll_event events; | |
1823 | struct lttng_ht *relay_connections_ht; | |
1824 | struct lttng_ht_node_ulong *node; | |
1825 | struct lttng_ht_iter iter; | |
1826 | struct lttng_viewer_cmd recv_hdr; | |
1827 | struct relay_local_data *relay_ctx = (struct relay_local_data *) data; | |
1828 | struct lttng_ht *sessions_ht = relay_ctx->sessions_ht; | |
d3e2ba59 JD |
1829 | |
1830 | DBG("[thread] Live viewer relay worker started"); | |
1831 | ||
1832 | rcu_register_thread(); | |
1833 | ||
eea7556c MD |
1834 | health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_WORKER); |
1835 | ||
d3e2ba59 JD |
1836 | /* table of connections indexed on socket */ |
1837 | relay_connections_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); | |
1838 | if (!relay_connections_ht) { | |
1839 | goto relay_connections_ht_error; | |
1840 | } | |
1841 | ||
1842 | ret = create_thread_poll_set(&events, 2); | |
1843 | if (ret < 0) { | |
1844 | goto error_poll_create; | |
1845 | } | |
1846 | ||
1847 | ret = lttng_poll_add(&events, live_relay_cmd_pipe[0], LPOLLIN | LPOLLRDHUP); | |
1848 | if (ret < 0) { | |
1849 | goto error; | |
1850 | } | |
1851 | ||
1852 | restart: | |
1853 | while (1) { | |
1854 | int i; | |
1855 | ||
eea7556c MD |
1856 | health_code_update(); |
1857 | ||
d3e2ba59 JD |
1858 | /* Infinite blocking call, waiting for transmission */ |
1859 | DBG3("Relayd live viewer worker thread polling..."); | |
eea7556c | 1860 | health_poll_entry(); |
d3e2ba59 | 1861 | ret = lttng_poll_wait(&events, -1); |
eea7556c | 1862 | health_poll_exit(); |
d3e2ba59 JD |
1863 | if (ret < 0) { |
1864 | /* | |
1865 | * Restart interrupted system call. | |
1866 | */ | |
1867 | if (errno == EINTR) { | |
1868 | goto restart; | |
1869 | } | |
1870 | goto error; | |
1871 | } | |
1872 | ||
1873 | nb_fd = ret; | |
1874 | ||
1875 | /* | |
1876 | * Process control. The control connection is prioritised so we don't | |
1877 | * starve it with high throughput tracing data on the data | |
1878 | * connection. | |
1879 | */ | |
1880 | for (i = 0; i < nb_fd; i++) { | |
1881 | /* Fetch once the poll data */ | |
1882 | uint32_t revents = LTTNG_POLL_GETEV(&events, i); | |
1883 | int pollfd = LTTNG_POLL_GETFD(&events, i); | |
1884 | ||
eea7556c MD |
1885 | health_code_update(); |
1886 | ||
d3e2ba59 JD |
1887 | /* Thread quit pipe has been closed. Killing thread. */ |
1888 | ret = check_thread_quit_pipe(pollfd, revents); | |
1889 | if (ret) { | |
1890 | err = 0; | |
1891 | goto exit; | |
1892 | } | |
1893 | ||
1894 | /* Inspect the relay cmd pipe for new connection */ | |
1895 | if (pollfd == live_relay_cmd_pipe[0]) { | |
1896 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1897 | ERR("Relay live pipe error"); | |
1898 | goto error; | |
1899 | } else if (revents & LPOLLIN) { | |
1900 | DBG("Relay live viewer command received"); | |
1901 | ret = add_connection(live_relay_cmd_pipe[0], | |
1902 | &events, relay_connections_ht); | |
1903 | if (ret < 0) { | |
1904 | goto error; | |
1905 | } | |
1906 | } | |
1907 | } else if (revents) { | |
1908 | rcu_read_lock(); | |
1909 | lttng_ht_lookup(relay_connections_ht, | |
1910 | (void *)((unsigned long) pollfd), &iter); | |
1911 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1912 | if (node == NULL) { | |
1913 | DBG2("Relay viewer sock %d not found", pollfd); | |
1914 | rcu_read_unlock(); | |
1915 | goto error; | |
1916 | } | |
1917 | relay_connection = caa_container_of(node, struct relay_command, | |
1918 | sock_n); | |
1919 | ||
1920 | if (revents & (LPOLLERR)) { | |
d3e2ba59 JD |
1921 | cleanup_poll_connection(&events, pollfd); |
1922 | del_connection(relay_connections_ht, &iter, | |
92c6ca54 | 1923 | relay_connection); |
d3e2ba59 JD |
1924 | } else if (revents & (LPOLLHUP | LPOLLRDHUP)) { |
1925 | DBG("Viewer socket %d hung up", pollfd); | |
1926 | cleanup_poll_connection(&events, pollfd); | |
1927 | del_connection(relay_connections_ht, &iter, | |
92c6ca54 | 1928 | relay_connection); |
d3e2ba59 JD |
1929 | } else if (revents & LPOLLIN) { |
1930 | ret = relay_connection->sock->ops->recvmsg( | |
1931 | relay_connection->sock, &recv_hdr, | |
1932 | sizeof(struct lttng_viewer_cmd), | |
1933 | 0); | |
1934 | /* connection closed */ | |
1935 | if (ret <= 0) { | |
1936 | cleanup_poll_connection(&events, pollfd); | |
aaec7998 | 1937 | del_connection(relay_connections_ht, &iter, |
92c6ca54 | 1938 | relay_connection); |
d3e2ba59 JD |
1939 | DBG("Viewer control connection closed with %d", |
1940 | pollfd); | |
1941 | } else { | |
1942 | if (relay_connection->session) { | |
1943 | DBG2("Relay viewer worker receiving data for " | |
1944 | "session: %" PRIu64, | |
1945 | relay_connection->session->id); | |
1946 | } | |
1947 | ret = process_control(&recv_hdr, relay_connection, | |
92c6ca54 | 1948 | sessions_ht); |
d3e2ba59 JD |
1949 | if (ret < 0) { |
1950 | /* Clear the session on error. */ | |
1951 | cleanup_poll_connection(&events, pollfd); | |
1952 | del_connection(relay_connections_ht, &iter, | |
92c6ca54 | 1953 | relay_connection); |
d3e2ba59 JD |
1954 | DBG("Viewer connection closed with %d", pollfd); |
1955 | } | |
1956 | } | |
1957 | } | |
1958 | rcu_read_unlock(); | |
1959 | } | |
1960 | } | |
1961 | } | |
1962 | ||
1963 | exit: | |
1964 | error: | |
1965 | lttng_poll_clean(&events); | |
1966 | ||
1967 | /* empty the hash table and free the memory */ | |
1968 | rcu_read_lock(); | |
1969 | cds_lfht_for_each_entry(relay_connections_ht->ht, &iter.iter, node, node) { | |
eea7556c MD |
1970 | health_code_update(); |
1971 | ||
d3e2ba59 JD |
1972 | node = lttng_ht_iter_get_node_ulong(&iter); |
1973 | if (!node) { | |
1974 | continue; | |
1975 | } | |
1976 | ||
1977 | relay_connection = caa_container_of(node, struct relay_command, | |
1978 | sock_n); | |
92c6ca54 | 1979 | del_connection(relay_connections_ht, &iter, relay_connection); |
d3e2ba59 JD |
1980 | } |
1981 | rcu_read_unlock(); | |
1982 | error_poll_create: | |
1983 | lttng_ht_destroy(relay_connections_ht); | |
1984 | relay_connections_ht_error: | |
1985 | /* Close relay cmd pipes */ | |
1986 | utils_close_pipe(live_relay_cmd_pipe); | |
1987 | if (err) { | |
1988 | DBG("Viewer worker thread exited with error"); | |
1989 | } | |
1990 | DBG("Viewer worker thread cleanup complete"); | |
eea7556c MD |
1991 | if (err) { |
1992 | health_error(); | |
1993 | ERR("Health error occurred in %s", __func__); | |
1994 | } | |
1995 | health_unregister(health_relayd); | |
d3e2ba59 JD |
1996 | stop_threads(); |
1997 | rcu_unregister_thread(); | |
1998 | return NULL; | |
1999 | } | |
2000 | ||
2001 | /* | |
2002 | * Create the relay command pipe to wake thread_manage_apps. | |
2003 | * Closed in cleanup(). | |
2004 | */ | |
2005 | static int create_relay_cmd_pipe(void) | |
2006 | { | |
2007 | int ret; | |
2008 | ||
2009 | ret = utils_create_pipe_cloexec(live_relay_cmd_pipe); | |
2010 | ||
2011 | return ret; | |
2012 | } | |
2013 | ||
aaec7998 | 2014 | void live_stop_threads(void) |
d3e2ba59 JD |
2015 | { |
2016 | int ret; | |
2017 | void *status; | |
2018 | ||
2019 | stop_threads(); | |
2020 | ||
2021 | ret = pthread_join(live_listener_thread, &status); | |
2022 | if (ret != 0) { | |
2023 | PERROR("pthread_join live listener"); | |
2024 | goto error; /* join error, exit without cleanup */ | |
2025 | } | |
2026 | ||
2027 | ret = pthread_join(live_worker_thread, &status); | |
2028 | if (ret != 0) { | |
2029 | PERROR("pthread_join live worker"); | |
2030 | goto error; /* join error, exit without cleanup */ | |
2031 | } | |
2032 | ||
2033 | ret = pthread_join(live_dispatcher_thread, &status); | |
2034 | if (ret != 0) { | |
2035 | PERROR("pthread_join live dispatcher"); | |
2036 | goto error; /* join error, exit without cleanup */ | |
2037 | } | |
2038 | ||
2039 | cleanup(); | |
2040 | ||
2041 | error: | |
2042 | return; | |
2043 | } | |
2044 | ||
2045 | /* | |
2046 | * main | |
2047 | */ | |
2048 | int live_start_threads(struct lttng_uri *uri, | |
42415026 | 2049 | struct relay_local_data *relay_ctx, int quit_pipe[2]) |
d3e2ba59 JD |
2050 | { |
2051 | int ret = 0; | |
2052 | void *status; | |
2053 | int is_root; | |
2054 | ||
2055 | assert(uri); | |
2056 | live_uri = uri; | |
2057 | ||
42415026 DG |
2058 | live_thread_quit_pipe[0] = quit_pipe[0]; |
2059 | live_thread_quit_pipe[1] = quit_pipe[1]; | |
d3e2ba59 JD |
2060 | |
2061 | /* Check if daemon is UID = 0 */ | |
2062 | is_root = !getuid(); | |
2063 | ||
2064 | if (!is_root) { | |
2065 | if (live_uri->port < 1024) { | |
2066 | ERR("Need to be root to use ports < 1024"); | |
2067 | ret = -1; | |
2068 | goto exit; | |
2069 | } | |
2070 | } | |
2071 | ||
2072 | /* Setup the thread apps communication pipe. */ | |
2073 | if ((ret = create_relay_cmd_pipe()) < 0) { | |
2074 | goto exit; | |
2075 | } | |
2076 | ||
2077 | /* Init relay command queue. */ | |
2078 | cds_wfq_init(&viewer_cmd_queue.queue); | |
2079 | ||
2080 | /* Set up max poll set size */ | |
2081 | lttng_poll_set_max_size(); | |
2082 | ||
2083 | /* Setup the dispatcher thread */ | |
2084 | ret = pthread_create(&live_dispatcher_thread, NULL, | |
2085 | thread_dispatcher, (void *) NULL); | |
2086 | if (ret != 0) { | |
2087 | PERROR("pthread_create viewer dispatcher"); | |
2088 | goto exit_dispatcher; | |
2089 | } | |
2090 | ||
2091 | /* Setup the worker thread */ | |
2092 | ret = pthread_create(&live_worker_thread, NULL, | |
2093 | thread_worker, relay_ctx); | |
2094 | if (ret != 0) { | |
2095 | PERROR("pthread_create viewer worker"); | |
2096 | goto exit_worker; | |
2097 | } | |
2098 | ||
2099 | /* Setup the listener thread */ | |
2100 | ret = pthread_create(&live_listener_thread, NULL, | |
2101 | thread_listener, (void *) NULL); | |
2102 | if (ret != 0) { | |
2103 | PERROR("pthread_create viewer listener"); | |
2104 | goto exit_listener; | |
2105 | } | |
2106 | ||
2107 | ret = 0; | |
2108 | goto end; | |
2109 | ||
2110 | exit_listener: | |
2111 | ret = pthread_join(live_listener_thread, &status); | |
2112 | if (ret != 0) { | |
2113 | PERROR("pthread_join live listener"); | |
2114 | goto error; /* join error, exit without cleanup */ | |
2115 | } | |
2116 | ||
2117 | exit_worker: | |
2118 | ret = pthread_join(live_worker_thread, &status); | |
2119 | if (ret != 0) { | |
2120 | PERROR("pthread_join live worker"); | |
2121 | goto error; /* join error, exit without cleanup */ | |
2122 | } | |
2123 | ||
2124 | exit_dispatcher: | |
2125 | ret = pthread_join(live_dispatcher_thread, &status); | |
2126 | if (ret != 0) { | |
2127 | PERROR("pthread_join live dispatcher"); | |
2128 | goto error; /* join error, exit without cleanup */ | |
2129 | } | |
2130 | ||
2131 | exit: | |
2132 | cleanup(); | |
2133 | ||
2134 | end: | |
2135 | error: | |
2136 | return ret; | |
2137 | } |