Commit | Line | Data |
---|---|---|
d3e2ba59 | 1 | /* |
ab5be9fa MJ |
2 | * Copyright (C) 2013 Julien Desfossez <jdesfossez@efficios.com> |
3 | * Copyright (C) 2013 David Goulet <dgoulet@efficios.com> | |
4 | * Copyright (C) 2015 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
d3e2ba59 | 5 | * |
ab5be9fa | 6 | * SPDX-License-Identifier: GPL-2.0-only |
d3e2ba59 | 7 | * |
d3e2ba59 JD |
8 | */ |
9 | ||
6c1c0768 | 10 | #define _LGPL_SOURCE |
8bb66c3c | 11 | #include <fcntl.h> |
d3e2ba59 JD |
12 | #include <getopt.h> |
13 | #include <grp.h> | |
8bb66c3c | 14 | #include <inttypes.h> |
d3e2ba59 JD |
15 | #include <limits.h> |
16 | #include <pthread.h> | |
17 | #include <signal.h> | |
18 | #include <stdio.h> | |
19 | #include <stdlib.h> | |
20 | #include <string.h> | |
21 | #include <sys/mman.h> | |
22 | #include <sys/mount.h> | |
23 | #include <sys/resource.h> | |
24 | #include <sys/socket.h> | |
25 | #include <sys/stat.h> | |
26 | #include <sys/types.h> | |
27 | #include <sys/wait.h> | |
8bb66c3c | 28 | #include <unistd.h> |
d3e2ba59 | 29 | #include <urcu/futex.h> |
7591bab1 | 30 | #include <urcu/rculist.h> |
8bb66c3c | 31 | #include <urcu/uatomic.h> |
d3e2ba59 | 32 | |
d3e2ba59 | 33 | #include <common/common.h> |
8bb66c3c | 34 | #include <common/compat/endian.h> |
d3e2ba59 JD |
35 | #include <common/compat/poll.h> |
36 | #include <common/compat/socket.h> | |
37 | #include <common/defaults.h> | |
8bb66c3c JG |
38 | #include <common/fd-tracker/utils.h> |
39 | #include <common/fs-handle.h> | |
d3e2ba59 | 40 | #include <common/futex.h> |
2f8f53af | 41 | #include <common/index/index.h> |
d3e2ba59 JD |
42 | #include <common/sessiond-comm/inet.h> |
43 | #include <common/sessiond-comm/relayd.h> | |
8bb66c3c | 44 | #include <common/sessiond-comm/sessiond-comm.h> |
d3e2ba59 JD |
45 | #include <common/uri.h> |
46 | #include <common/utils.h> | |
8bb66c3c | 47 | #include <lttng/lttng.h> |
d3e2ba59 JD |
48 | |
49 | #include "cmd.h" | |
8bb66c3c JG |
50 | #include "connection.h" |
51 | #include "ctf-trace.h" | |
52 | #include "health-relayd.h" | |
d3e2ba59 JD |
53 | #include "live.h" |
54 | #include "lttng-relayd.h" | |
2a174661 | 55 | #include "session.h" |
8bb66c3c JG |
56 | #include "stream.h" |
57 | #include "testpoint.h" | |
58 | #include "utils.h" | |
7591bab1 | 59 | #include "viewer-session.h" |
8bb66c3c | 60 | #include "viewer-stream.h" |
7591bab1 MD |
61 | |
62 | #define SESSION_BUF_DEFAULT_COUNT 16 | |
d3e2ba59 JD |
63 | |
64 | static struct lttng_uri *live_uri; | |
65 | ||
d3e2ba59 JD |
66 | /* |
67 | * This pipe is used to inform the worker thread that a command is queued and | |
68 | * ready to be processed. | |
69 | */ | |
58eb9381 | 70 | static int live_conn_pipe[2] = { -1, -1 }; |
d3e2ba59 JD |
71 | |
72 | /* Shared between threads */ | |
73 | static int live_dispatch_thread_exit; | |
74 | ||
75 | static pthread_t live_listener_thread; | |
76 | static pthread_t live_dispatcher_thread; | |
77 | static pthread_t live_worker_thread; | |
78 | ||
79 | /* | |
80 | * Relay command queue. | |
81 | * | |
82 | * The live_thread_listener and live_thread_dispatcher communicate with this | |
83 | * queue. | |
84 | */ | |
58eb9381 | 85 | static struct relay_conn_queue viewer_conn_queue; |
d3e2ba59 JD |
86 | |
87 | static uint64_t last_relay_viewer_session_id; | |
7591bab1 MD |
88 | static pthread_mutex_t last_relay_viewer_session_id_lock = |
89 | PTHREAD_MUTEX_INITIALIZER; | |
d3e2ba59 JD |
90 | |
91 | /* | |
92 | * Cleanup the daemon | |
93 | */ | |
94 | static | |
178a0557 | 95 | void cleanup_relayd_live(void) |
d3e2ba59 JD |
96 | { |
97 | DBG("Cleaning up"); | |
98 | ||
d3e2ba59 JD |
99 | free(live_uri); |
100 | } | |
101 | ||
2f8f53af DG |
102 | /* |
103 | * Receive a request buffer using a given socket, destination allocated buffer | |
104 | * of length size. | |
105 | * | |
106 | * Return the size of the received message or else a negative value on error | |
107 | * with errno being set by recvmsg() syscall. | |
108 | */ | |
109 | static | |
110 | ssize_t recv_request(struct lttcomm_sock *sock, void *buf, size_t size) | |
111 | { | |
112 | ssize_t ret; | |
113 | ||
2f8f53af DG |
114 | ret = sock->ops->recvmsg(sock, buf, size, 0); |
115 | if (ret < 0 || ret != size) { | |
116 | if (ret == 0) { | |
117 | /* Orderly shutdown. Not necessary to print an error. */ | |
118 | DBG("Socket %d did an orderly shutdown", sock->fd); | |
119 | } else { | |
120 | ERR("Relay failed to receive request."); | |
121 | } | |
122 | ret = -1; | |
123 | } | |
124 | ||
125 | return ret; | |
126 | } | |
127 | ||
128 | /* | |
129 | * Send a response buffer using a given socket, source allocated buffer of | |
130 | * length size. | |
131 | * | |
132 | * Return the size of the sent message or else a negative value on error with | |
133 | * errno being set by sendmsg() syscall. | |
134 | */ | |
135 | static | |
136 | ssize_t send_response(struct lttcomm_sock *sock, void *buf, size_t size) | |
137 | { | |
138 | ssize_t ret; | |
139 | ||
2f8f53af DG |
140 | ret = sock->ops->sendmsg(sock, buf, size, 0); |
141 | if (ret < 0) { | |
142 | ERR("Relayd failed to send response."); | |
143 | } | |
144 | ||
145 | return ret; | |
146 | } | |
147 | ||
148 | /* | |
f04a971b JD |
149 | * Atomically check if new streams got added in one of the sessions attached |
150 | * and reset the flag to 0. | |
2f8f53af DG |
151 | * |
152 | * Returns 1 if new streams got added, 0 if nothing changed, a negative value | |
153 | * on error. | |
154 | */ | |
155 | static | |
f04a971b | 156 | int check_new_streams(struct relay_connection *conn) |
2f8f53af | 157 | { |
2f8f53af | 158 | struct relay_session *session; |
f04a971b JD |
159 | unsigned long current_val; |
160 | int ret = 0; | |
2f8f53af | 161 | |
f04a971b JD |
162 | if (!conn->viewer_session) { |
163 | goto end; | |
164 | } | |
7591bab1 MD |
165 | rcu_read_lock(); |
166 | cds_list_for_each_entry_rcu(session, | |
167 | &conn->viewer_session->session_list, | |
168 | viewer_session_node) { | |
169 | if (!session_get(session)) { | |
170 | continue; | |
171 | } | |
f04a971b JD |
172 | current_val = uatomic_cmpxchg(&session->new_streams, 1, 0); |
173 | ret = current_val; | |
7591bab1 | 174 | session_put(session); |
f04a971b JD |
175 | if (ret == 1) { |
176 | goto end; | |
177 | } | |
2f8f53af | 178 | } |
f04a971b | 179 | end: |
7591bab1 | 180 | rcu_read_unlock(); |
2f8f53af DG |
181 | return ret; |
182 | } | |
183 | ||
184 | /* | |
185 | * Send viewer streams to the given socket. The ignore_sent_flag indicates if | |
186 | * this function should ignore the sent flag or not. | |
187 | * | |
188 | * Return 0 on success or else a negative value. | |
189 | */ | |
190 | static | |
191 | ssize_t send_viewer_streams(struct lttcomm_sock *sock, | |
c06fdd95 | 192 | uint64_t session_id, unsigned int ignore_sent_flag) |
2f8f53af DG |
193 | { |
194 | ssize_t ret; | |
2f8f53af DG |
195 | struct lttng_ht_iter iter; |
196 | struct relay_viewer_stream *vstream; | |
197 | ||
2f8f53af DG |
198 | rcu_read_lock(); |
199 | ||
200 | cds_lfht_for_each_entry(viewer_streams_ht->ht, &iter.iter, vstream, | |
201 | stream_n.node) { | |
2a174661 | 202 | struct ctf_trace *ctf_trace; |
aaabc543 | 203 | struct lttng_viewer_stream send_stream = {}; |
2a174661 | 204 | |
2f8f53af DG |
205 | health_code_update(); |
206 | ||
7591bab1 MD |
207 | if (!viewer_stream_get(vstream)) { |
208 | continue; | |
209 | } | |
210 | ||
211 | pthread_mutex_lock(&vstream->stream->lock); | |
2f8f53af | 212 | /* Ignore if not the same session. */ |
c06fdd95 | 213 | if (vstream->stream->trace->session->id != session_id || |
2f8f53af | 214 | (!ignore_sent_flag && vstream->sent_flag)) { |
7591bab1 MD |
215 | pthread_mutex_unlock(&vstream->stream->lock); |
216 | viewer_stream_put(vstream); | |
2f8f53af DG |
217 | continue; |
218 | } | |
219 | ||
7591bab1 MD |
220 | ctf_trace = vstream->stream->trace; |
221 | send_stream.id = htobe64(vstream->stream->stream_handle); | |
2a174661 | 222 | send_stream.ctf_trace_id = htobe64(ctf_trace->id); |
7591bab1 MD |
223 | send_stream.metadata_flag = htobe32( |
224 | vstream->stream->is_metadata); | |
f8f011fb MD |
225 | if (lttng_strncpy(send_stream.path_name, vstream->path_name, |
226 | sizeof(send_stream.path_name))) { | |
227 | pthread_mutex_unlock(&vstream->stream->lock); | |
228 | viewer_stream_put(vstream); | |
229 | ret = -1; /* Error. */ | |
230 | goto end_unlock; | |
231 | } | |
232 | if (lttng_strncpy(send_stream.channel_name, | |
233 | vstream->channel_name, | |
234 | sizeof(send_stream.channel_name))) { | |
235 | pthread_mutex_unlock(&vstream->stream->lock); | |
236 | viewer_stream_put(vstream); | |
237 | ret = -1; /* Error. */ | |
238 | goto end_unlock; | |
239 | } | |
2f8f53af | 240 | |
7591bab1 MD |
241 | DBG("Sending stream %" PRIu64 " to viewer", |
242 | vstream->stream->stream_handle); | |
243 | vstream->sent_flag = 1; | |
244 | pthread_mutex_unlock(&vstream->stream->lock); | |
245 | ||
2f8f53af | 246 | ret = send_response(sock, &send_stream, sizeof(send_stream)); |
7591bab1 | 247 | viewer_stream_put(vstream); |
2f8f53af DG |
248 | if (ret < 0) { |
249 | goto end_unlock; | |
250 | } | |
2f8f53af DG |
251 | } |
252 | ||
253 | ret = 0; | |
254 | ||
255 | end_unlock: | |
256 | rcu_read_unlock(); | |
257 | return ret; | |
258 | } | |
259 | ||
260 | /* | |
261 | * Create every viewer stream possible for the given session with the seek | |
262 | * type. Three counters *can* be return which are in order the total amount of | |
263 | * viewer stream of the session, the number of unsent stream and the number of | |
264 | * stream created. Those counters can be NULL and thus will be ignored. | |
265 | * | |
c06fdd95 JG |
266 | * session must be locked to ensure that we see either none or all initial |
267 | * streams for a session, but no intermediate state.. | |
268 | * | |
2f8f53af DG |
269 | * Return 0 on success or else a negative value. |
270 | */ | |
9edaf114 JG |
271 | static int make_viewer_streams(struct relay_session *relay_session, |
272 | struct relay_viewer_session *viewer_session, | |
b66a15d1 JG |
273 | enum lttng_viewer_seek seek_t, |
274 | uint32_t *nb_total, | |
275 | uint32_t *nb_unsent, | |
276 | uint32_t *nb_created, | |
277 | bool *closed) | |
2f8f53af DG |
278 | { |
279 | int ret; | |
2f8f53af | 280 | struct lttng_ht_iter iter; |
2a174661 | 281 | struct ctf_trace *ctf_trace; |
9edaf114 | 282 | struct relay_stream *relay_stream = NULL; |
2f8f53af | 283 | |
a0377dfe | 284 | LTTNG_ASSERT(relay_session); |
9edaf114 | 285 | ASSERT_LOCKED(relay_session->lock); |
2f8f53af | 286 | |
9edaf114 | 287 | if (relay_session->connection_closed) { |
bddf80e4 MD |
288 | *closed = true; |
289 | } | |
290 | ||
2f8f53af | 291 | /* |
7591bab1 MD |
292 | * Create viewer streams for relay streams that are ready to be |
293 | * used for a the given session id only. | |
2f8f53af | 294 | */ |
2a174661 | 295 | rcu_read_lock(); |
9edaf114 JG |
296 | cds_lfht_for_each_entry (relay_session->ctf_traces_ht->ht, &iter.iter, |
297 | ctf_trace, node.node) { | |
123ed7c2 | 298 | bool trace_has_metadata_stream = false; |
2f8f53af DG |
299 | |
300 | health_code_update(); | |
301 | ||
7591bab1 | 302 | if (!ctf_trace_get(ctf_trace)) { |
2f8f53af DG |
303 | continue; |
304 | } | |
305 | ||
123ed7c2 FD |
306 | /* |
307 | * Iterate over all the streams of the trace to see if we have a | |
308 | * metadata stream. | |
309 | */ | |
9edaf114 JG |
310 | cds_list_for_each_entry_rcu(relay_stream, |
311 | &ctf_trace->stream_list, stream_node) | |
123ed7c2 | 312 | { |
9edaf114 JG |
313 | bool is_metadata_stream; |
314 | ||
315 | pthread_mutex_lock(&relay_stream->lock); | |
316 | is_metadata_stream = relay_stream->is_metadata; | |
317 | pthread_mutex_unlock(&relay_stream->lock); | |
318 | ||
319 | if (is_metadata_stream) { | |
123ed7c2 FD |
320 | trace_has_metadata_stream = true; |
321 | break; | |
322 | } | |
323 | } | |
324 | ||
9edaf114 JG |
325 | relay_stream = NULL; |
326 | ||
123ed7c2 FD |
327 | /* |
328 | * If there is no metadata stream in this trace at the moment | |
329 | * and we never sent one to the viewer, skip the trace. We | |
330 | * accept that the viewer will not see this trace at all. | |
331 | */ | |
332 | if (!trace_has_metadata_stream && | |
333 | !ctf_trace->metadata_stream_sent_to_viewer) { | |
3d7708ff JG |
334 | ctf_trace_put(ctf_trace); |
335 | continue; | |
123ed7c2 FD |
336 | } |
337 | ||
9edaf114 JG |
338 | cds_list_for_each_entry_rcu(relay_stream, |
339 | &ctf_trace->stream_list, stream_node) | |
340 | { | |
341 | struct relay_viewer_stream *viewer_stream; | |
2a174661 | 342 | |
9edaf114 | 343 | if (!stream_get(relay_stream)) { |
2a174661 DG |
344 | continue; |
345 | } | |
9edaf114 JG |
346 | |
347 | pthread_mutex_lock(&relay_stream->lock); | |
7591bab1 | 348 | /* |
d812ecb9 | 349 | * stream published is protected by the session lock. |
7591bab1 | 350 | */ |
9edaf114 | 351 | if (!relay_stream->published) { |
7591bab1 MD |
352 | goto next; |
353 | } | |
9edaf114 JG |
354 | viewer_stream = viewer_stream_get_by_id( |
355 | relay_stream->stream_handle); | |
356 | if (!viewer_stream) { | |
80516611 | 357 | struct lttng_trace_chunk *viewer_stream_trace_chunk = NULL; |
9edaf114 | 358 | |
123ed7c2 FD |
359 | /* |
360 | * Save that we sent the metadata stream to the | |
361 | * viewer. So that we know what trace the viewer | |
362 | * is aware of. | |
363 | */ | |
9edaf114 JG |
364 | if (relay_stream->is_metadata) { |
365 | ctf_trace->metadata_stream_sent_to_viewer = true; | |
366 | } | |
367 | ||
368 | /* | |
369 | * If a rotation is ongoing, use a copy of the | |
370 | * relay stream's chunk to ensure the stream | |
371 | * files exist. | |
372 | * | |
373 | * Otherwise, the viewer session's current trace | |
374 | * chunk can be used safely. | |
375 | */ | |
376 | if ((relay_stream->ongoing_rotation.is_set || | |
377 | relay_session->ongoing_rotation) && | |
378 | relay_stream->trace_chunk) { | |
379 | viewer_stream_trace_chunk = lttng_trace_chunk_copy( | |
380 | relay_stream->trace_chunk); | |
381 | if (!viewer_stream_trace_chunk) { | |
382 | ret = -1; | |
383 | ctf_trace_put(ctf_trace); | |
384 | goto error_unlock; | |
385 | } | |
386 | } else { | |
80516611 JG |
387 | /* |
388 | * Transition the viewer session into the newest trace chunk available. | |
389 | */ | |
390 | if (!lttng_trace_chunk_ids_equal(viewer_session->current_trace_chunk, | |
391 | relay_stream->trace_chunk)) { | |
392 | ||
393 | ret = viewer_session_set_trace_chunk_copy( | |
394 | viewer_session, | |
395 | relay_stream->trace_chunk); | |
396 | if (ret) { | |
397 | ret = -1; | |
398 | ctf_trace_put(ctf_trace); | |
399 | goto error_unlock; | |
400 | } | |
401 | } | |
9edaf114 | 402 | |
87250ba1 JG |
403 | if (relay_stream->trace_chunk) { |
404 | /* | |
405 | * If the corresponding relay | |
406 | * stream's trace chunk is set, | |
407 | * the viewer stream will be | |
408 | * created under it. | |
409 | * | |
410 | * Note that a relay stream can | |
411 | * have a NULL output trace | |
412 | * chunk (for instance, after a | |
413 | * clear against a stopped | |
414 | * session). | |
415 | */ | |
416 | const bool reference_acquired = lttng_trace_chunk_get( | |
417 | viewer_session->current_trace_chunk); | |
418 | ||
419 | LTTNG_ASSERT(reference_acquired); | |
420 | viewer_stream_trace_chunk = | |
421 | viewer_session->current_trace_chunk; | |
422 | } | |
123ed7c2 | 423 | } |
9edaf114 JG |
424 | |
425 | viewer_stream = viewer_stream_create( | |
426 | relay_stream, | |
427 | viewer_stream_trace_chunk, | |
428 | seek_t); | |
429 | lttng_trace_chunk_put(viewer_stream_trace_chunk); | |
430 | viewer_stream_trace_chunk = NULL; | |
431 | if (!viewer_stream) { | |
2a174661 | 432 | ret = -1; |
7591bab1 | 433 | ctf_trace_put(ctf_trace); |
2a174661 DG |
434 | goto error_unlock; |
435 | } | |
2a174661 DG |
436 | |
437 | if (nb_created) { | |
438 | /* Update number of created stream counter. */ | |
439 | (*nb_created)++; | |
440 | } | |
2229a09c MD |
441 | /* |
442 | * Ensure a self-reference is preserved even | |
443 | * after we have put our local reference. | |
444 | */ | |
9edaf114 | 445 | if (!viewer_stream_get(viewer_stream)) { |
862d3a3b MD |
446 | ERR("Unable to get self-reference on viewer stream, logic error."); |
447 | abort(); | |
448 | } | |
7591bab1 | 449 | } else { |
9edaf114 | 450 | if (!viewer_stream->sent_flag && nb_unsent) { |
7591bab1 MD |
451 | /* Update number of unsent stream counter. */ |
452 | (*nb_unsent)++; | |
453 | } | |
2f8f53af | 454 | } |
2a174661 DG |
455 | /* Update number of total stream counter. */ |
456 | if (nb_total) { | |
9edaf114 JG |
457 | if (relay_stream->is_metadata) { |
458 | if (!relay_stream->closed || | |
459 | relay_stream->metadata_received > | |
460 | viewer_stream->metadata_sent) { | |
2229a09c MD |
461 | (*nb_total)++; |
462 | } | |
463 | } else { | |
9edaf114 JG |
464 | if (!relay_stream->closed || |
465 | !(((int64_t)(relay_stream->prev_data_seq - | |
466 | relay_stream->last_net_seq_num)) >= | |
467 | 0)) { | |
2229a09c MD |
468 | (*nb_total)++; |
469 | } | |
470 | } | |
2f8f53af | 471 | } |
2229a09c | 472 | /* Put local reference. */ |
9edaf114 | 473 | viewer_stream_put(viewer_stream); |
7591bab1 | 474 | next: |
9edaf114 JG |
475 | pthread_mutex_unlock(&relay_stream->lock); |
476 | stream_put(relay_stream); | |
2f8f53af | 477 | } |
9edaf114 | 478 | relay_stream = NULL; |
7591bab1 | 479 | ctf_trace_put(ctf_trace); |
2f8f53af DG |
480 | } |
481 | ||
482 | ret = 0; | |
483 | ||
484 | error_unlock: | |
2a174661 | 485 | rcu_read_unlock(); |
80516611 | 486 | |
9edaf114 JG |
487 | if (relay_stream) { |
488 | pthread_mutex_unlock(&relay_stream->lock); | |
489 | stream_put(relay_stream); | |
490 | } | |
491 | ||
2f8f53af DG |
492 | return ret; |
493 | } | |
494 | ||
b4aacfdc | 495 | int relayd_live_stop(void) |
d3e2ba59 | 496 | { |
b4aacfdc | 497 | /* Stop dispatch thread */ |
d3e2ba59 | 498 | CMM_STORE_SHARED(live_dispatch_thread_exit, 1); |
58eb9381 | 499 | futex_nto1_wake(&viewer_conn_queue.futex); |
b4aacfdc | 500 | return 0; |
d3e2ba59 JD |
501 | } |
502 | ||
d3e2ba59 JD |
503 | /* |
504 | * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set. | |
505 | */ | |
506 | static | |
23f940ff JG |
507 | int create_named_thread_poll_set(struct lttng_poll_event *events, |
508 | int size, const char *name) | |
d3e2ba59 JD |
509 | { |
510 | int ret; | |
511 | ||
512 | if (events == NULL || size == 0) { | |
513 | ret = -1; | |
514 | goto error; | |
515 | } | |
516 | ||
23f940ff JG |
517 | ret = fd_tracker_util_poll_create(the_fd_tracker, |
518 | name, events, 1, LTTNG_CLOEXEC); | |
ad36f3a7 JG |
519 | if (ret) { |
520 | PERROR("Failed to create \"%s\" poll file descriptor", name); | |
521 | goto error; | |
522 | } | |
d3e2ba59 JD |
523 | |
524 | /* Add quit pipe */ | |
bcf4a440 | 525 | ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN | LPOLLERR); |
d3e2ba59 JD |
526 | if (ret < 0) { |
527 | goto error; | |
528 | } | |
529 | ||
530 | return 0; | |
531 | ||
532 | error: | |
533 | return ret; | |
534 | } | |
535 | ||
536 | /* | |
537 | * Check if the thread quit pipe was triggered. | |
538 | * | |
539 | * Return 1 if it was triggered else 0; | |
540 | */ | |
541 | static | |
bcf4a440 | 542 | int check_thread_quit_pipe(int fd, uint32_t events) |
d3e2ba59 | 543 | { |
bcf4a440 | 544 | if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) { |
d3e2ba59 JD |
545 | return 1; |
546 | } | |
547 | ||
548 | return 0; | |
549 | } | |
550 | ||
8855795d JG |
551 | static |
552 | int create_sock(void *data, int *out_fd) | |
553 | { | |
554 | int ret; | |
ac497a37 | 555 | struct lttcomm_sock *sock = (lttcomm_sock *) data; |
8855795d JG |
556 | |
557 | ret = lttcomm_create_sock(sock); | |
558 | if (ret < 0) { | |
559 | goto end; | |
560 | } | |
561 | ||
562 | *out_fd = sock->fd; | |
563 | end: | |
564 | return ret; | |
565 | } | |
566 | ||
567 | static | |
568 | int close_sock(void *data, int *in_fd) | |
569 | { | |
ac497a37 | 570 | struct lttcomm_sock *sock = (lttcomm_sock *) data; |
8855795d JG |
571 | |
572 | return sock->ops->close(sock); | |
573 | } | |
574 | ||
29555a78 JG |
575 | static int accept_sock(void *data, int *out_fd) |
576 | { | |
577 | int ret = 0; | |
578 | /* Socks is an array of in_sock, out_sock. */ | |
ac497a37 | 579 | struct lttcomm_sock **socks = (lttcomm_sock **) data; |
29555a78 JG |
580 | struct lttcomm_sock *in_sock = socks[0]; |
581 | ||
582 | socks[1] = in_sock->ops->accept(in_sock); | |
583 | if (!socks[1]) { | |
584 | ret = -1; | |
585 | goto end; | |
586 | } | |
587 | *out_fd = socks[1]->fd; | |
588 | end: | |
589 | return ret; | |
590 | } | |
591 | ||
592 | static | |
593 | struct lttcomm_sock *accept_live_sock(struct lttcomm_sock *listening_sock, | |
594 | const char *name) | |
595 | { | |
596 | int out_fd, ret; | |
597 | struct lttcomm_sock *socks[2] = { listening_sock, NULL }; | |
598 | struct lttcomm_sock *new_sock = NULL; | |
599 | ||
600 | ret = fd_tracker_open_unsuspendable_fd(the_fd_tracker, &out_fd, | |
601 | (const char **) &name, 1, accept_sock, &socks); | |
602 | if (ret) { | |
603 | goto end; | |
604 | } | |
605 | new_sock = socks[1]; | |
606 | DBG("%s accepted, socket %d", name, new_sock->fd); | |
607 | end: | |
608 | return new_sock; | |
609 | } | |
610 | ||
d3e2ba59 JD |
611 | /* |
612 | * Create and init socket from uri. | |
613 | */ | |
614 | static | |
8855795d | 615 | struct lttcomm_sock *init_socket(struct lttng_uri *uri, const char *name) |
d3e2ba59 | 616 | { |
8855795d | 617 | int ret, sock_fd; |
d3e2ba59 | 618 | struct lttcomm_sock *sock = NULL; |
8855795d JG |
619 | char uri_str[LTTNG_PATH_MAX]; |
620 | char *formated_name = NULL; | |
d3e2ba59 JD |
621 | |
622 | sock = lttcomm_alloc_sock_from_uri(uri); | |
623 | if (sock == NULL) { | |
624 | ERR("Allocating socket"); | |
625 | goto error; | |
626 | } | |
627 | ||
8855795d JG |
628 | /* |
629 | * Don't fail to create the socket if the name can't be built as it is | |
630 | * only used for debugging purposes. | |
631 | */ | |
632 | ret = uri_to_str_url(uri, uri_str, sizeof(uri_str)); | |
633 | uri_str[sizeof(uri_str) - 1] = '\0'; | |
634 | if (ret >= 0) { | |
635 | ret = asprintf(&formated_name, "%s socket @ %s", name, | |
636 | uri_str); | |
637 | if (ret < 0) { | |
638 | formated_name = NULL; | |
639 | } | |
d3e2ba59 | 640 | } |
8855795d JG |
641 | |
642 | ret = fd_tracker_open_unsuspendable_fd(the_fd_tracker, &sock_fd, | |
643 | (const char **) (formated_name ? &formated_name : NULL), | |
644 | 1, create_sock, sock); | |
d546eeec JG |
645 | if (ret) { |
646 | PERROR("Failed to create \"%s\" socket", | |
647 | formated_name ?: "Unknown"); | |
648 | goto error; | |
649 | } | |
8855795d | 650 | DBG("Listening on %s socket %d", name, sock->fd); |
d3e2ba59 JD |
651 | |
652 | ret = sock->ops->bind(sock); | |
653 | if (ret < 0) { | |
2288467f | 654 | PERROR("Failed to bind lttng-live socket"); |
d3e2ba59 JD |
655 | goto error; |
656 | } | |
657 | ||
658 | ret = sock->ops->listen(sock, -1); | |
659 | if (ret < 0) { | |
660 | goto error; | |
661 | ||
662 | } | |
663 | ||
d546eeec | 664 | free(formated_name); |
d3e2ba59 JD |
665 | return sock; |
666 | ||
667 | error: | |
668 | if (sock) { | |
669 | lttcomm_destroy_sock(sock); | |
670 | } | |
d546eeec | 671 | free(formated_name); |
d3e2ba59 JD |
672 | return NULL; |
673 | } | |
674 | ||
675 | /* | |
676 | * This thread manages the listening for new connections on the network | |
677 | */ | |
678 | static | |
679 | void *thread_listener(void *data) | |
680 | { | |
681 | int i, ret, pollfd, err = -1; | |
d3e2ba59 JD |
682 | uint32_t revents, nb_fd; |
683 | struct lttng_poll_event events; | |
684 | struct lttcomm_sock *live_control_sock; | |
685 | ||
686 | DBG("[thread] Relay live listener started"); | |
687 | ||
8fba2b8d | 688 | rcu_register_thread(); |
eea7556c MD |
689 | health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_LISTENER); |
690 | ||
691 | health_code_update(); | |
692 | ||
8855795d | 693 | live_control_sock = init_socket(live_uri, "Live listener"); |
d3e2ba59 JD |
694 | if (!live_control_sock) { |
695 | goto error_sock_control; | |
696 | } | |
697 | ||
fb4d42ab | 698 | /* Pass 2 as size here for the thread quit pipe and control sockets. */ |
23f940ff JG |
699 | ret = create_named_thread_poll_set(&events, 2, |
700 | "Live listener thread epoll"); | |
d3e2ba59 JD |
701 | if (ret < 0) { |
702 | goto error_create_poll; | |
703 | } | |
704 | ||
705 | /* Add the control socket */ | |
706 | ret = lttng_poll_add(&events, live_control_sock->fd, LPOLLIN | LPOLLRDHUP); | |
707 | if (ret < 0) { | |
708 | goto error_poll_add; | |
709 | } | |
710 | ||
3fd27398 MD |
711 | lttng_relay_notify_ready(); |
712 | ||
9b5e0863 MD |
713 | if (testpoint(relayd_thread_live_listener)) { |
714 | goto error_testpoint; | |
715 | } | |
716 | ||
d3e2ba59 | 717 | while (1) { |
eea7556c MD |
718 | health_code_update(); |
719 | ||
d3e2ba59 JD |
720 | DBG("Listener accepting live viewers connections"); |
721 | ||
722 | restart: | |
eea7556c | 723 | health_poll_entry(); |
d3e2ba59 | 724 | ret = lttng_poll_wait(&events, -1); |
eea7556c | 725 | health_poll_exit(); |
d3e2ba59 JD |
726 | if (ret < 0) { |
727 | /* | |
728 | * Restart interrupted system call. | |
729 | */ | |
730 | if (errno == EINTR) { | |
731 | goto restart; | |
732 | } | |
733 | goto error; | |
734 | } | |
735 | nb_fd = ret; | |
736 | ||
737 | DBG("Relay new viewer connection received"); | |
738 | for (i = 0; i < nb_fd; i++) { | |
eea7556c MD |
739 | health_code_update(); |
740 | ||
d3e2ba59 JD |
741 | /* Fetch once the poll data */ |
742 | revents = LTTNG_POLL_GETEV(&events, i); | |
743 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
744 | ||
745 | /* Thread quit pipe has been closed. Killing thread. */ | |
bcf4a440 | 746 | ret = check_thread_quit_pipe(pollfd, revents); |
d3e2ba59 JD |
747 | if (ret) { |
748 | err = 0; | |
749 | goto exit; | |
750 | } | |
751 | ||
03e43155 | 752 | if (revents & LPOLLIN) { |
d3e2ba59 | 753 | /* |
7591bab1 MD |
754 | * A new connection is requested, therefore a |
755 | * viewer connection is allocated in this | |
756 | * thread, enqueued to a global queue and | |
757 | * dequeued (and freed) in the worker thread. | |
d3e2ba59 | 758 | */ |
58eb9381 DG |
759 | int val = 1; |
760 | struct relay_connection *new_conn; | |
d3e2ba59 JD |
761 | struct lttcomm_sock *newsock; |
762 | ||
29555a78 JG |
763 | newsock = accept_live_sock(live_control_sock, |
764 | "Live socket to client"); | |
d3e2ba59 JD |
765 | if (!newsock) { |
766 | PERROR("accepting control sock"); | |
d3e2ba59 JD |
767 | goto error; |
768 | } | |
769 | DBG("Relay viewer connection accepted socket %d", newsock->fd); | |
58eb9381 | 770 | |
d3e2ba59 | 771 | ret = setsockopt(newsock->fd, SOL_SOCKET, SO_REUSEADDR, &val, |
58eb9381 | 772 | sizeof(val)); |
d3e2ba59 JD |
773 | if (ret < 0) { |
774 | PERROR("setsockopt inet"); | |
775 | lttcomm_destroy_sock(newsock); | |
d3e2ba59 JD |
776 | goto error; |
777 | } | |
7591bab1 MD |
778 | new_conn = connection_create(newsock, RELAY_CONNECTION_UNKNOWN); |
779 | if (!new_conn) { | |
780 | lttcomm_destroy_sock(newsock); | |
781 | goto error; | |
782 | } | |
783 | /* Ownership assumed by the connection. */ | |
784 | newsock = NULL; | |
d3e2ba59 | 785 | |
58eb9381 | 786 | /* Enqueue request for the dispatcher thread. */ |
ac497a37 SM |
787 | cds_wfcq_head_ptr_t head; |
788 | head.h = &viewer_conn_queue.head; | |
789 | cds_wfcq_enqueue(head, &viewer_conn_queue.tail, | |
8bdee6e2 | 790 | &new_conn->qnode); |
d3e2ba59 JD |
791 | |
792 | /* | |
7591bab1 MD |
793 | * Wake the dispatch queue futex. |
794 | * Implicit memory barrier with the | |
795 | * exchange in cds_wfcq_enqueue. | |
d3e2ba59 | 796 | */ |
58eb9381 | 797 | futex_nto1_wake(&viewer_conn_queue.futex); |
03e43155 MD |
798 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
799 | ERR("socket poll error"); | |
800 | goto error; | |
801 | } else { | |
802 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
803 | goto error; | |
d3e2ba59 JD |
804 | } |
805 | } | |
806 | } | |
807 | ||
808 | exit: | |
809 | error: | |
810 | error_poll_add: | |
9b5e0863 | 811 | error_testpoint: |
23f940ff | 812 | (void) fd_tracker_util_poll_clean(the_fd_tracker, &events); |
d3e2ba59 JD |
813 | error_create_poll: |
814 | if (live_control_sock->fd >= 0) { | |
8855795d JG |
815 | int sock_fd = live_control_sock->fd; |
816 | ||
817 | ret = fd_tracker_close_unsuspendable_fd(the_fd_tracker, | |
818 | &sock_fd, 1, close_sock, | |
819 | live_control_sock); | |
d3e2ba59 JD |
820 | if (ret) { |
821 | PERROR("close"); | |
822 | } | |
8855795d | 823 | live_control_sock->fd = -1; |
d3e2ba59 JD |
824 | } |
825 | lttcomm_destroy_sock(live_control_sock); | |
826 | error_sock_control: | |
827 | if (err) { | |
eea7556c | 828 | health_error(); |
d3e2ba59 JD |
829 | DBG("Live viewer listener thread exited with error"); |
830 | } | |
eea7556c | 831 | health_unregister(health_relayd); |
8fba2b8d | 832 | rcu_unregister_thread(); |
d3e2ba59 | 833 | DBG("Live viewer listener thread cleanup complete"); |
b4aacfdc MD |
834 | if (lttng_relay_stop_threads()) { |
835 | ERR("Error stopping threads"); | |
178a0557 | 836 | } |
d3e2ba59 JD |
837 | return NULL; |
838 | } | |
839 | ||
840 | /* | |
841 | * This thread manages the dispatching of the requests to worker threads | |
842 | */ | |
843 | static | |
844 | void *thread_dispatcher(void *data) | |
845 | { | |
6cd525e8 MD |
846 | int err = -1; |
847 | ssize_t ret; | |
8bdee6e2 | 848 | struct cds_wfcq_node *node; |
58eb9381 | 849 | struct relay_connection *conn = NULL; |
d3e2ba59 JD |
850 | |
851 | DBG("[thread] Live viewer relay dispatcher started"); | |
852 | ||
eea7556c MD |
853 | health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_DISPATCHER); |
854 | ||
9b5e0863 MD |
855 | if (testpoint(relayd_thread_live_dispatcher)) { |
856 | goto error_testpoint; | |
857 | } | |
858 | ||
eea7556c MD |
859 | health_code_update(); |
860 | ||
0ed3b1a8 | 861 | for (;;) { |
eea7556c MD |
862 | health_code_update(); |
863 | ||
d3e2ba59 | 864 | /* Atomically prepare the queue futex */ |
58eb9381 | 865 | futex_nto1_prepare(&viewer_conn_queue.futex); |
d3e2ba59 | 866 | |
0ed3b1a8 MD |
867 | if (CMM_LOAD_SHARED(live_dispatch_thread_exit)) { |
868 | break; | |
869 | } | |
870 | ||
d3e2ba59 | 871 | do { |
eea7556c MD |
872 | health_code_update(); |
873 | ||
d3e2ba59 | 874 | /* Dequeue commands */ |
8bdee6e2 SM |
875 | node = cds_wfcq_dequeue_blocking(&viewer_conn_queue.head, |
876 | &viewer_conn_queue.tail); | |
d3e2ba59 JD |
877 | if (node == NULL) { |
878 | DBG("Woken up but nothing in the live-viewer " | |
879 | "relay command queue"); | |
880 | /* Continue thread execution */ | |
881 | break; | |
882 | } | |
58eb9381 | 883 | conn = caa_container_of(node, struct relay_connection, qnode); |
d3e2ba59 | 884 | DBG("Dispatching viewer request waiting on sock %d", |
58eb9381 | 885 | conn->sock->fd); |
d3e2ba59 JD |
886 | |
887 | /* | |
7591bab1 MD |
888 | * Inform worker thread of the new request. This |
889 | * call is blocking so we can be assured that | |
890 | * the data will be read at some point in time | |
891 | * or wait to the end of the world :) | |
d3e2ba59 | 892 | */ |
58eb9381 DG |
893 | ret = lttng_write(live_conn_pipe[1], &conn, sizeof(conn)); |
894 | if (ret < 0) { | |
895 | PERROR("write conn pipe"); | |
7591bab1 | 896 | connection_put(conn); |
d3e2ba59 JD |
897 | goto error; |
898 | } | |
899 | } while (node != NULL); | |
900 | ||
901 | /* Futex wait on queue. Blocking call on futex() */ | |
eea7556c | 902 | health_poll_entry(); |
58eb9381 | 903 | futex_nto1_wait(&viewer_conn_queue.futex); |
eea7556c | 904 | health_poll_exit(); |
d3e2ba59 JD |
905 | } |
906 | ||
eea7556c MD |
907 | /* Normal exit, no error */ |
908 | err = 0; | |
909 | ||
d3e2ba59 | 910 | error: |
9b5e0863 | 911 | error_testpoint: |
eea7556c MD |
912 | if (err) { |
913 | health_error(); | |
914 | ERR("Health error occurred in %s", __func__); | |
915 | } | |
916 | health_unregister(health_relayd); | |
d3e2ba59 | 917 | DBG("Live viewer dispatch thread dying"); |
b4aacfdc MD |
918 | if (lttng_relay_stop_threads()) { |
919 | ERR("Error stopping threads"); | |
178a0557 | 920 | } |
d3e2ba59 JD |
921 | return NULL; |
922 | } | |
923 | ||
924 | /* | |
925 | * Establish connection with the viewer and check the versions. | |
926 | * | |
927 | * Return 0 on success or else negative value. | |
928 | */ | |
929 | static | |
58eb9381 | 930 | int viewer_connect(struct relay_connection *conn) |
d3e2ba59 JD |
931 | { |
932 | int ret; | |
933 | struct lttng_viewer_connect reply, msg; | |
934 | ||
58eb9381 | 935 | conn->version_check_done = 1; |
d3e2ba59 | 936 | |
eea7556c MD |
937 | health_code_update(); |
938 | ||
2f8f53af DG |
939 | DBG("Viewer is establishing a connection to the relayd."); |
940 | ||
58eb9381 | 941 | ret = recv_request(conn->sock, &msg, sizeof(msg)); |
2f8f53af | 942 | if (ret < 0) { |
d3e2ba59 JD |
943 | goto end; |
944 | } | |
945 | ||
eea7556c MD |
946 | health_code_update(); |
947 | ||
f46b2ce6 | 948 | memset(&reply, 0, sizeof(reply)); |
d3e2ba59 JD |
949 | reply.major = RELAYD_VERSION_COMM_MAJOR; |
950 | reply.minor = RELAYD_VERSION_COMM_MINOR; | |
951 | ||
952 | /* Major versions must be the same */ | |
953 | if (reply.major != be32toh(msg.major)) { | |
2f8f53af DG |
954 | DBG("Incompatible major versions ([relayd] %u vs [client] %u)", |
955 | reply.major, be32toh(msg.major)); | |
72180669 | 956 | ret = -1; |
d3e2ba59 JD |
957 | goto end; |
958 | } | |
959 | ||
58eb9381 | 960 | conn->major = reply.major; |
d3e2ba59 JD |
961 | /* We adapt to the lowest compatible version */ |
962 | if (reply.minor <= be32toh(msg.minor)) { | |
58eb9381 | 963 | conn->minor = reply.minor; |
d3e2ba59 | 964 | } else { |
58eb9381 | 965 | conn->minor = be32toh(msg.minor); |
d3e2ba59 JD |
966 | } |
967 | ||
c4e361a4 | 968 | if (be32toh(msg.type) == LTTNG_VIEWER_CLIENT_COMMAND) { |
58eb9381 | 969 | conn->type = RELAY_VIEWER_COMMAND; |
c4e361a4 | 970 | } else if (be32toh(msg.type) == LTTNG_VIEWER_CLIENT_NOTIFICATION) { |
58eb9381 | 971 | conn->type = RELAY_VIEWER_NOTIFICATION; |
d3e2ba59 JD |
972 | } else { |
973 | ERR("Unknown connection type : %u", be32toh(msg.type)); | |
974 | ret = -1; | |
975 | goto end; | |
976 | } | |
977 | ||
978 | reply.major = htobe32(reply.major); | |
979 | reply.minor = htobe32(reply.minor); | |
58eb9381 | 980 | if (conn->type == RELAY_VIEWER_COMMAND) { |
93b4787b | 981 | /* |
7591bab1 MD |
982 | * Increment outside of htobe64 macro, because the argument can |
983 | * be used more than once within the macro, and thus the | |
984 | * operation may be undefined. | |
93b4787b | 985 | */ |
7591bab1 | 986 | pthread_mutex_lock(&last_relay_viewer_session_id_lock); |
93b4787b | 987 | last_relay_viewer_session_id++; |
7591bab1 | 988 | pthread_mutex_unlock(&last_relay_viewer_session_id_lock); |
93b4787b | 989 | reply.viewer_session_id = htobe64(last_relay_viewer_session_id); |
d3e2ba59 | 990 | } |
eea7556c MD |
991 | |
992 | health_code_update(); | |
993 | ||
58eb9381 | 994 | ret = send_response(conn->sock, &reply, sizeof(reply)); |
d3e2ba59 | 995 | if (ret < 0) { |
2f8f53af | 996 | goto end; |
d3e2ba59 JD |
997 | } |
998 | ||
eea7556c MD |
999 | health_code_update(); |
1000 | ||
58eb9381 | 1001 | DBG("Version check done using protocol %u.%u", conn->major, conn->minor); |
d3e2ba59 JD |
1002 | ret = 0; |
1003 | ||
1004 | end: | |
1005 | return ret; | |
1006 | } | |
1007 | ||
1008 | /* | |
1009 | * Send the viewer the list of current sessions. | |
7591bab1 MD |
1010 | * We need to create a copy of the hash table content because otherwise |
1011 | * we cannot assume the number of entries stays the same between getting | |
1012 | * the number of HT elements and iteration over the HT. | |
d3e2ba59 JD |
1013 | * |
1014 | * Return 0 on success or else a negative value. | |
1015 | */ | |
1016 | static | |
58eb9381 | 1017 | int viewer_list_sessions(struct relay_connection *conn) |
d3e2ba59 | 1018 | { |
5f10c6b1 | 1019 | int ret = 0; |
d3e2ba59 | 1020 | struct lttng_viewer_list_sessions session_list; |
d3e2ba59 | 1021 | struct lttng_ht_iter iter; |
d3e2ba59 | 1022 | struct relay_session *session; |
7591bab1 MD |
1023 | struct lttng_viewer_session *send_session_buf = NULL; |
1024 | uint32_t buf_count = SESSION_BUF_DEFAULT_COUNT; | |
1025 | uint32_t count = 0; | |
d3e2ba59 JD |
1026 | |
1027 | DBG("List sessions received"); | |
1028 | ||
ac497a37 | 1029 | send_session_buf = (lttng_viewer_session *) zmalloc(SESSION_BUF_DEFAULT_COUNT * sizeof(*send_session_buf)); |
7591bab1 MD |
1030 | if (!send_session_buf) { |
1031 | return -1; | |
d3e2ba59 JD |
1032 | } |
1033 | ||
7591bab1 MD |
1034 | rcu_read_lock(); |
1035 | cds_lfht_for_each_entry(sessions_ht->ht, &iter.iter, session, | |
2f8f53af | 1036 | session_n.node) { |
7591bab1 | 1037 | struct lttng_viewer_session *send_session; |
d3e2ba59 | 1038 | |
eea7556c MD |
1039 | health_code_update(); |
1040 | ||
d995f382 | 1041 | pthread_mutex_lock(&session->lock); |
7e0a4379 JR |
1042 | if (session->connection_closed) { |
1043 | /* Skip closed session */ | |
d995f382 JG |
1044 | goto next_session; |
1045 | } | |
7e0a4379 | 1046 | |
7591bab1 MD |
1047 | if (count >= buf_count) { |
1048 | struct lttng_viewer_session *newbuf; | |
1049 | uint32_t new_buf_count = buf_count << 1; | |
eea7556c | 1050 | |
ac497a37 | 1051 | newbuf = (lttng_viewer_session *) realloc(send_session_buf, |
7591bab1 MD |
1052 | new_buf_count * sizeof(*send_session_buf)); |
1053 | if (!newbuf) { | |
1054 | ret = -1; | |
d995f382 | 1055 | goto break_loop; |
7591bab1 MD |
1056 | } |
1057 | send_session_buf = newbuf; | |
1058 | buf_count = new_buf_count; | |
6763619c | 1059 | } |
7591bab1 | 1060 | send_session = &send_session_buf[count]; |
bfc3fb17 MD |
1061 | if (lttng_strncpy(send_session->session_name, |
1062 | session->session_name, | |
1063 | sizeof(send_session->session_name))) { | |
1064 | ret = -1; | |
d995f382 | 1065 | goto break_loop; |
bfc3fb17 MD |
1066 | } |
1067 | if (lttng_strncpy(send_session->hostname, session->hostname, | |
1068 | sizeof(send_session->hostname))) { | |
1069 | ret = -1; | |
d995f382 | 1070 | goto break_loop; |
bfc3fb17 | 1071 | } |
7591bab1 MD |
1072 | send_session->id = htobe64(session->id); |
1073 | send_session->live_timer = htobe32(session->live_timer); | |
1074 | if (session->viewer_attached) { | |
1075 | send_session->clients = htobe32(1); | |
1076 | } else { | |
1077 | send_session->clients = htobe32(0); | |
d227d5bd | 1078 | } |
7591bab1 MD |
1079 | send_session->streams = htobe32(session->stream_count); |
1080 | count++; | |
d995f382 JG |
1081 | next_session: |
1082 | pthread_mutex_unlock(&session->lock); | |
1083 | continue; | |
1084 | break_loop: | |
1085 | pthread_mutex_unlock(&session->lock); | |
1086 | break; | |
7591bab1 MD |
1087 | } |
1088 | rcu_read_unlock(); | |
5f10c6b1 JG |
1089 | if (ret < 0) { |
1090 | goto end_free; | |
1091 | } | |
d227d5bd | 1092 | |
7591bab1 | 1093 | session_list.sessions_count = htobe32(count); |
d227d5bd | 1094 | |
7591bab1 | 1095 | health_code_update(); |
d227d5bd | 1096 | |
7591bab1 MD |
1097 | ret = send_response(conn->sock, &session_list, sizeof(session_list)); |
1098 | if (ret < 0) { | |
1099 | goto end_free; | |
d227d5bd | 1100 | } |
d227d5bd | 1101 | |
7591bab1 | 1102 | health_code_update(); |
d227d5bd | 1103 | |
7591bab1 MD |
1104 | ret = send_response(conn->sock, send_session_buf, |
1105 | count * sizeof(*send_session_buf)); | |
1106 | if (ret < 0) { | |
1107 | goto end_free; | |
d227d5bd | 1108 | } |
7591bab1 | 1109 | health_code_update(); |
d227d5bd | 1110 | |
7591bab1 MD |
1111 | ret = 0; |
1112 | end_free: | |
1113 | free(send_session_buf); | |
1114 | return ret; | |
d227d5bd JD |
1115 | } |
1116 | ||
80e8027a | 1117 | /* |
7591bab1 | 1118 | * Send the viewer the list of current streams. |
80e8027a JD |
1119 | */ |
1120 | static | |
58eb9381 | 1121 | int viewer_get_new_streams(struct relay_connection *conn) |
80e8027a JD |
1122 | { |
1123 | int ret, send_streams = 0; | |
7591bab1 | 1124 | uint32_t nb_created = 0, nb_unsent = 0, nb_streams = 0, nb_total = 0; |
80e8027a JD |
1125 | struct lttng_viewer_new_streams_request request; |
1126 | struct lttng_viewer_new_streams_response response; | |
b66a15d1 | 1127 | struct relay_session *session = NULL; |
6763619c | 1128 | uint64_t session_id; |
bddf80e4 | 1129 | bool closed = false; |
80e8027a | 1130 | |
a0377dfe | 1131 | LTTNG_ASSERT(conn); |
80e8027a JD |
1132 | |
1133 | DBG("Get new streams received"); | |
1134 | ||
80e8027a JD |
1135 | health_code_update(); |
1136 | ||
2f8f53af | 1137 | /* Receive the request from the connected client. */ |
58eb9381 | 1138 | ret = recv_request(conn->sock, &request, sizeof(request)); |
2f8f53af | 1139 | if (ret < 0) { |
80e8027a JD |
1140 | goto error; |
1141 | } | |
6763619c | 1142 | session_id = be64toh(request.session_id); |
80e8027a JD |
1143 | |
1144 | health_code_update(); | |
1145 | ||
53efb85a MD |
1146 | memset(&response, 0, sizeof(response)); |
1147 | ||
7591bab1 | 1148 | session = session_get_by_id(session_id); |
2f8f53af | 1149 | if (!session) { |
6763619c | 1150 | DBG("Relay session %" PRIu64 " not found", session_id); |
c4e361a4 | 1151 | response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_ERR); |
80e8027a JD |
1152 | goto send_reply; |
1153 | } | |
1154 | ||
7591bab1 | 1155 | if (!viewer_session_is_attached(conn->viewer_session, session)) { |
c4e361a4 | 1156 | response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_ERR); |
80e8027a JD |
1157 | goto send_reply; |
1158 | } | |
1159 | ||
c876d657 JR |
1160 | /* |
1161 | * For any new stream, create it with LTTNG_VIEWER_SEEK_BEGINNING since | |
1162 | * that at this point the client is already attached to the session.Aany | |
1163 | * initial stream will have been created with the seek type at attach | |
1164 | * time (for now most readers use the LTTNG_VIEWER_SEEK_LAST on attach). | |
1165 | * Otherwise any event happening in a new stream between the attach and | |
1166 | * a call to viewer_get_new_streams will be "lost" (never received) from | |
1167 | * the viewer's point of view. | |
1168 | */ | |
c06fdd95 | 1169 | pthread_mutex_lock(&session->lock); |
b66a15d1 | 1170 | ret = make_viewer_streams(session, |
9edaf114 | 1171 | conn->viewer_session, |
c876d657 | 1172 | LTTNG_VIEWER_SEEK_BEGINNING, &nb_total, &nb_unsent, |
bddf80e4 | 1173 | &nb_created, &closed); |
2f8f53af | 1174 | if (ret < 0) { |
b66a15d1 | 1175 | goto error_unlock_session; |
2f8f53af | 1176 | } |
3d0bbd40 JG |
1177 | send_streams = 1; |
1178 | response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_OK); | |
b66a15d1 | 1179 | |
2f8f53af DG |
1180 | /* Only send back the newly created streams with the unsent ones. */ |
1181 | nb_streams = nb_created + nb_unsent; | |
80e8027a JD |
1182 | response.streams_count = htobe32(nb_streams); |
1183 | ||
4479f682 | 1184 | /* |
2229a09c MD |
1185 | * If the session is closed, HUP when there are no more streams |
1186 | * with data. | |
4479f682 | 1187 | */ |
bddf80e4 | 1188 | if (closed && nb_total == 0) { |
4479f682 | 1189 | send_streams = 0; |
bddf80e4 | 1190 | response.streams_count = 0; |
4479f682 | 1191 | response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_HUP); |
3d0bbd40 | 1192 | goto send_reply_unlock; |
4479f682 | 1193 | } |
3d0bbd40 JG |
1194 | send_reply_unlock: |
1195 | pthread_mutex_unlock(&session->lock); | |
4479f682 | 1196 | |
80e8027a JD |
1197 | send_reply: |
1198 | health_code_update(); | |
58eb9381 | 1199 | ret = send_response(conn->sock, &response, sizeof(response)); |
80e8027a | 1200 | if (ret < 0) { |
7591bab1 | 1201 | goto end_put_session; |
80e8027a JD |
1202 | } |
1203 | health_code_update(); | |
1204 | ||
1205 | /* | |
7591bab1 MD |
1206 | * Unknown or empty session, just return gracefully, the viewer |
1207 | * knows what is happening. | |
80e8027a JD |
1208 | */ |
1209 | if (!send_streams || !nb_streams) { | |
1210 | ret = 0; | |
7591bab1 | 1211 | goto end_put_session; |
80e8027a JD |
1212 | } |
1213 | ||
2f8f53af | 1214 | /* |
7591bab1 MD |
1215 | * Send stream and *DON'T* ignore the sent flag so every viewer |
1216 | * streams that were not sent from that point will be sent to | |
1217 | * the viewer. | |
2f8f53af | 1218 | */ |
c06fdd95 | 1219 | ret = send_viewer_streams(conn->sock, session_id, 0); |
2f8f53af | 1220 | if (ret < 0) { |
7591bab1 | 1221 | goto end_put_session; |
80e8027a JD |
1222 | } |
1223 | ||
7591bab1 MD |
1224 | end_put_session: |
1225 | if (session) { | |
1226 | session_put(session); | |
1227 | } | |
80e8027a JD |
1228 | error: |
1229 | return ret; | |
b66a15d1 JG |
1230 | error_unlock_session: |
1231 | pthread_mutex_unlock(&session->lock); | |
1232 | session_put(session); | |
1233 | return ret; | |
80e8027a JD |
1234 | } |
1235 | ||
d3e2ba59 JD |
1236 | /* |
1237 | * Send the viewer the list of current sessions. | |
1238 | */ | |
1239 | static | |
58eb9381 | 1240 | int viewer_attach_session(struct relay_connection *conn) |
d3e2ba59 | 1241 | { |
2f8f53af DG |
1242 | int send_streams = 0; |
1243 | ssize_t ret; | |
80e8027a | 1244 | uint32_t nb_streams = 0; |
2f8f53af | 1245 | enum lttng_viewer_seek seek_type; |
d3e2ba59 JD |
1246 | struct lttng_viewer_attach_session_request request; |
1247 | struct lttng_viewer_attach_session_response response; | |
7591bab1 | 1248 | struct relay_session *session = NULL; |
dbd6665b | 1249 | enum lttng_viewer_attach_return_code viewer_attach_status; |
bddf80e4 | 1250 | bool closed = false; |
c06fdd95 | 1251 | uint64_t session_id; |
d3e2ba59 | 1252 | |
a0377dfe | 1253 | LTTNG_ASSERT(conn); |
d3e2ba59 | 1254 | |
eea7556c MD |
1255 | health_code_update(); |
1256 | ||
2f8f53af | 1257 | /* Receive the request from the connected client. */ |
58eb9381 | 1258 | ret = recv_request(conn->sock, &request, sizeof(request)); |
2f8f53af | 1259 | if (ret < 0) { |
d3e2ba59 JD |
1260 | goto error; |
1261 | } | |
1262 | ||
c06fdd95 | 1263 | session_id = be64toh(request.session_id); |
eea7556c MD |
1264 | health_code_update(); |
1265 | ||
53efb85a MD |
1266 | memset(&response, 0, sizeof(response)); |
1267 | ||
c3b7390b JD |
1268 | if (!conn->viewer_session) { |
1269 | DBG("Client trying to attach before creating a live viewer session"); | |
1270 | response.status = htobe32(LTTNG_VIEWER_ATTACH_NO_SESSION); | |
1271 | goto send_reply; | |
1272 | } | |
1273 | ||
c06fdd95 | 1274 | session = session_get_by_id(session_id); |
2f8f53af | 1275 | if (!session) { |
c06fdd95 | 1276 | DBG("Relay session %" PRIu64 " not found", session_id); |
c4e361a4 | 1277 | response.status = htobe32(LTTNG_VIEWER_ATTACH_UNK); |
d3e2ba59 JD |
1278 | goto send_reply; |
1279 | } | |
c06fdd95 | 1280 | DBG("Attach session ID %" PRIu64 " received", session_id); |
d3e2ba59 | 1281 | |
c06fdd95 | 1282 | pthread_mutex_lock(&session->lock); |
7591bab1 | 1283 | if (session->live_timer == 0) { |
d3e2ba59 | 1284 | DBG("Not live session"); |
c4e361a4 | 1285 | response.status = htobe32(LTTNG_VIEWER_ATTACH_NOT_LIVE); |
d3e2ba59 | 1286 | goto send_reply; |
7591bab1 MD |
1287 | } |
1288 | ||
1289 | send_streams = 1; | |
dbd6665b JG |
1290 | viewer_attach_status = viewer_session_attach(conn->viewer_session, |
1291 | session); | |
1292 | if (viewer_attach_status != LTTNG_VIEWER_ATTACH_OK) { | |
1293 | response.status = htobe32(viewer_attach_status); | |
7591bab1 | 1294 | goto send_reply; |
d3e2ba59 JD |
1295 | } |
1296 | ||
1297 | switch (be32toh(request.seek)) { | |
c4e361a4 JD |
1298 | case LTTNG_VIEWER_SEEK_BEGINNING: |
1299 | case LTTNG_VIEWER_SEEK_LAST: | |
7591bab1 | 1300 | response.status = htobe32(LTTNG_VIEWER_ATTACH_OK); |
ac497a37 | 1301 | seek_type = (lttng_viewer_seek) be32toh(request.seek); |
d3e2ba59 JD |
1302 | break; |
1303 | default: | |
1304 | ERR("Wrong seek parameter"); | |
c4e361a4 | 1305 | response.status = htobe32(LTTNG_VIEWER_ATTACH_SEEK_ERR); |
d3e2ba59 JD |
1306 | send_streams = 0; |
1307 | goto send_reply; | |
1308 | } | |
1309 | ||
b66a15d1 | 1310 | ret = make_viewer_streams(session, |
9edaf114 | 1311 | conn->viewer_session, seek_type, |
b66a15d1 | 1312 | &nb_streams, NULL, NULL, &closed); |
2f8f53af | 1313 | if (ret < 0) { |
7591bab1 | 1314 | goto end_put_session; |
d3e2ba59 | 1315 | } |
c06fdd95 JG |
1316 | pthread_mutex_unlock(&session->lock); |
1317 | session_put(session); | |
1318 | session = NULL; | |
1319 | ||
1320 | response.streams_count = htobe32(nb_streams); | |
bddf80e4 MD |
1321 | /* |
1322 | * If the session is closed when the viewer is attaching, it | |
1323 | * means some of the streams may have been concurrently removed, | |
1324 | * so we don't allow the viewer to attach, even if there are | |
1325 | * streams available. | |
1326 | */ | |
1327 | if (closed) { | |
1328 | send_streams = 0; | |
1329 | response.streams_count = 0; | |
06079f15 | 1330 | response.status = htobe32(LTTNG_VIEWER_ATTACH_UNK); |
bddf80e4 MD |
1331 | goto send_reply; |
1332 | } | |
1333 | ||
d3e2ba59 | 1334 | send_reply: |
eea7556c | 1335 | health_code_update(); |
58eb9381 | 1336 | ret = send_response(conn->sock, &response, sizeof(response)); |
d3e2ba59 | 1337 | if (ret < 0) { |
7591bab1 | 1338 | goto end_put_session; |
d3e2ba59 | 1339 | } |
eea7556c | 1340 | health_code_update(); |
d3e2ba59 JD |
1341 | |
1342 | /* | |
7591bab1 MD |
1343 | * Unknown or empty session, just return gracefully, the viewer |
1344 | * knows what is happening. | |
d3e2ba59 | 1345 | */ |
157df586 | 1346 | if (!send_streams || !nb_streams) { |
d3e2ba59 | 1347 | ret = 0; |
7591bab1 | 1348 | goto end_put_session; |
d3e2ba59 JD |
1349 | } |
1350 | ||
2f8f53af | 1351 | /* Send stream and ignore the sent flag. */ |
c06fdd95 | 1352 | ret = send_viewer_streams(conn->sock, session_id, 1); |
2f8f53af | 1353 | if (ret < 0) { |
7591bab1 | 1354 | goto end_put_session; |
d3e2ba59 | 1355 | } |
d3e2ba59 | 1356 | |
7591bab1 MD |
1357 | end_put_session: |
1358 | if (session) { | |
c06fdd95 | 1359 | pthread_mutex_unlock(&session->lock); |
7591bab1 MD |
1360 | session_put(session); |
1361 | } | |
4a9daf17 JD |
1362 | error: |
1363 | return ret; | |
1364 | } | |
1365 | ||
878c34cf DG |
1366 | /* |
1367 | * Open the index file if needed for the given vstream. | |
1368 | * | |
f8f3885c MD |
1369 | * If an index file is successfully opened, the vstream will set it as its |
1370 | * current index file. | |
878c34cf DG |
1371 | * |
1372 | * Return 0 on success, a negative value on error (-ENOENT if not ready yet). | |
7591bab1 MD |
1373 | * |
1374 | * Called with rstream lock held. | |
878c34cf DG |
1375 | */ |
1376 | static int try_open_index(struct relay_viewer_stream *vstream, | |
1377 | struct relay_stream *rstream) | |
1378 | { | |
1379 | int ret = 0; | |
ebb29c10 JG |
1380 | const uint32_t connection_major = rstream->trace->session->major; |
1381 | const uint32_t connection_minor = rstream->trace->session->minor; | |
3ff5c5db | 1382 | enum lttng_trace_chunk_status chunk_status; |
878c34cf | 1383 | |
f8f3885c | 1384 | if (vstream->index_file) { |
878c34cf DG |
1385 | goto end; |
1386 | } | |
1387 | ||
1388 | /* | |
7591bab1 | 1389 | * First time, we open the index file and at least one index is ready. |
878c34cf | 1390 | */ |
80516611 JG |
1391 | if (rstream->index_received_seqcount == 0 || |
1392 | !vstream->stream_file.trace_chunk) { | |
878c34cf DG |
1393 | ret = -ENOENT; |
1394 | goto end; | |
1395 | } | |
80516611 | 1396 | |
3ff5c5db | 1397 | chunk_status = lttng_index_file_create_from_trace_chunk_read_only( |
b66a15d1 | 1398 | vstream->stream_file.trace_chunk, rstream->path_name, |
ebb29c10 JG |
1399 | rstream->channel_name, rstream->tracefile_size, |
1400 | vstream->current_tracefile_id, | |
1401 | lttng_to_index_major(connection_major, connection_minor), | |
3ff5c5db MD |
1402 | lttng_to_index_minor(connection_major, connection_minor), |
1403 | true, &vstream->index_file); | |
1404 | if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { | |
1405 | if (chunk_status == LTTNG_TRACE_CHUNK_STATUS_NO_FILE) { | |
1406 | ret = -ENOENT; | |
1407 | } else { | |
1408 | ret = -1; | |
1409 | } | |
878c34cf DG |
1410 | } |
1411 | ||
1412 | end: | |
1413 | return ret; | |
1414 | } | |
1415 | ||
1416 | /* | |
7591bab1 MD |
1417 | * Check the status of the index for the given stream. This function |
1418 | * updates the index structure if needed and can put (close) the vstream | |
1419 | * in the HUP situation. | |
1420 | * | |
1421 | * Return 0 means that we can proceed with the index. A value of 1 means | |
1422 | * that the index has been updated and is ready to be sent to the | |
1423 | * client. A negative value indicates an error that can't be handled. | |
878c34cf | 1424 | * |
7591bab1 | 1425 | * Called with rstream lock held. |
878c34cf DG |
1426 | */ |
1427 | static int check_index_status(struct relay_viewer_stream *vstream, | |
1428 | struct relay_stream *rstream, struct ctf_trace *trace, | |
1429 | struct lttng_viewer_index *index) | |
1430 | { | |
1431 | int ret; | |
1432 | ||
68c40154 MD |
1433 | DBG("Check index status: index_received_seqcount %" PRIu64 " " |
1434 | "index_sent_seqcount %" PRIu64 " " | |
1435 | "for stream %" PRIu64, | |
1436 | rstream->index_received_seqcount, | |
1437 | vstream->index_sent_seqcount, | |
1438 | vstream->stream->stream_handle); | |
797bc362 | 1439 | if ((trace->session->connection_closed || rstream->closed) |
a44ca2ca MD |
1440 | && rstream->index_received_seqcount |
1441 | == vstream->index_sent_seqcount) { | |
797bc362 MD |
1442 | /* |
1443 | * Last index sent and session connection or relay | |
1444 | * stream are closed. | |
1445 | */ | |
7591bab1 MD |
1446 | index->status = htobe32(LTTNG_VIEWER_INDEX_HUP); |
1447 | goto hup; | |
1448 | } else if (rstream->beacon_ts_end != -1ULL && | |
b0d240a2 MD |
1449 | (rstream->index_received_seqcount == 0 || |
1450 | (vstream->index_sent_seqcount != 0 && | |
a44ca2ca | 1451 | rstream->index_received_seqcount |
b0d240a2 | 1452 | <= vstream->index_sent_seqcount))) { |
7591bab1 MD |
1453 | /* |
1454 | * We've received a synchronization beacon and the last index | |
1455 | * available has been sent, the index for now is inactive. | |
1456 | * | |
1457 | * In this case, we have received a beacon which allows us to | |
1458 | * inform the client of a time interval during which we can | |
1459 | * guarantee that there are no events to read (and never will | |
1460 | * be). | |
b0d240a2 MD |
1461 | * |
1462 | * The sent seqcount can grow higher than receive seqcount on | |
1463 | * clear because the rotation performed by clear will push | |
1464 | * the index_sent_seqcount ahead (see | |
1465 | * viewer_stream_sync_tracefile_array_tail) and skip over | |
1466 | * packet sequence numbers. | |
7591bab1 MD |
1467 | */ |
1468 | index->status = htobe32(LTTNG_VIEWER_INDEX_INACTIVE); | |
1469 | index->timestamp_end = htobe64(rstream->beacon_ts_end); | |
1470 | index->stream_id = htobe64(rstream->ctf_stream_id); | |
68c40154 MD |
1471 | DBG("Check index status: inactive with beacon, for stream %" PRIu64, |
1472 | vstream->stream->stream_handle); | |
7591bab1 | 1473 | goto index_ready; |
b0d240a2 MD |
1474 | } else if (rstream->index_received_seqcount == 0 || |
1475 | (vstream->index_sent_seqcount != 0 && | |
1476 | rstream->index_received_seqcount | |
1477 | <= vstream->index_sent_seqcount)) { | |
7591bab1 | 1478 | /* |
b0d240a2 | 1479 | * This checks whether received <= sent seqcount. In |
a44ca2ca MD |
1480 | * this case, we have not received a beacon. Therefore, |
1481 | * we can only ask the client to retry later. | |
b0d240a2 MD |
1482 | * |
1483 | * The sent seqcount can grow higher than receive seqcount on | |
1484 | * clear because the rotation performed by clear will push | |
1485 | * the index_sent_seqcount ahead (see | |
1486 | * viewer_stream_sync_tracefile_array_tail) and skip over | |
1487 | * packet sequence numbers. | |
7591bab1 MD |
1488 | */ |
1489 | index->status = htobe32(LTTNG_VIEWER_INDEX_RETRY); | |
68c40154 MD |
1490 | DBG("Check index status: retry for stream %" PRIu64, |
1491 | vstream->stream->stream_handle); | |
7591bab1 | 1492 | goto index_ready; |
a44ca2ca MD |
1493 | } else if (!tracefile_array_seq_in_file(rstream->tfa, |
1494 | vstream->current_tracefile_id, | |
1495 | vstream->index_sent_seqcount)) { | |
7591bab1 | 1496 | /* |
a44ca2ca MD |
1497 | * The next index we want to send cannot be read either |
1498 | * because we need to perform a rotation, or due to | |
1499 | * the producer having overwritten its trace file. | |
7591bab1 | 1500 | */ |
a44ca2ca | 1501 | DBG("Viewer stream %" PRIu64 " rotation", |
7591bab1 MD |
1502 | vstream->stream->stream_handle); |
1503 | ret = viewer_stream_rotate(vstream); | |
b0d240a2 | 1504 | if (ret == 1) { |
7591bab1 MD |
1505 | /* EOF across entire stream. */ |
1506 | index->status = htobe32(LTTNG_VIEWER_INDEX_HUP); | |
1507 | goto hup; | |
1508 | } | |
7591bab1 | 1509 | /* |
a44ca2ca MD |
1510 | * If we have been pushed due to overwrite, it |
1511 | * necessarily means there is data that can be read in | |
1512 | * the stream. If we rotated because we reached the end | |
1513 | * of a tracefile, it means the following tracefile | |
1514 | * needs to contain at least one index, else we would | |
1515 | * have already returned LTTNG_VIEWER_INDEX_RETRY to the | |
1516 | * viewer. The updated index_sent_seqcount needs to | |
1517 | * point to a readable index entry now. | |
1518 | * | |
1519 | * In the case where we "rotate" on a single file, we | |
1520 | * can end up in a case where the requested index is | |
1521 | * still unavailable. | |
7591bab1 | 1522 | */ |
a44ca2ca MD |
1523 | if (rstream->tracefile_count == 1 && |
1524 | !tracefile_array_seq_in_file( | |
1525 | rstream->tfa, | |
1526 | vstream->current_tracefile_id, | |
1527 | vstream->index_sent_seqcount)) { | |
1528 | index->status = htobe32(LTTNG_VIEWER_INDEX_RETRY); | |
68c40154 MD |
1529 | DBG("Check index status: retry: " |
1530 | "tracefile array sequence number %" PRIu64 | |
1531 | " not in file for stream %" PRIu64, | |
1532 | vstream->index_sent_seqcount, | |
1533 | vstream->stream->stream_handle); | |
a44ca2ca | 1534 | goto index_ready; |
878c34cf | 1535 | } |
a0377dfe | 1536 | LTTNG_ASSERT(tracefile_array_seq_in_file(rstream->tfa, |
a44ca2ca MD |
1537 | vstream->current_tracefile_id, |
1538 | vstream->index_sent_seqcount)); | |
878c34cf | 1539 | } |
a44ca2ca MD |
1540 | /* ret == 0 means successful so we continue. */ |
1541 | ret = 0; | |
878c34cf DG |
1542 | return ret; |
1543 | ||
1544 | hup: | |
7591bab1 | 1545 | viewer_stream_put(vstream); |
878c34cf DG |
1546 | index_ready: |
1547 | return 1; | |
1548 | } | |
1549 | ||
80516611 JG |
1550 | static |
1551 | void viewer_stream_rotate_to_trace_chunk(struct relay_viewer_stream *vstream, | |
1552 | struct lttng_trace_chunk *new_trace_chunk) | |
1553 | { | |
1554 | lttng_trace_chunk_put(vstream->stream_file.trace_chunk); | |
1555 | ||
1556 | if (new_trace_chunk) { | |
1557 | const bool acquired_reference = lttng_trace_chunk_get( | |
1558 | new_trace_chunk); | |
1559 | ||
a0377dfe | 1560 | LTTNG_ASSERT(acquired_reference); |
80516611 JG |
1561 | } |
1562 | ||
1563 | vstream->stream_file.trace_chunk = new_trace_chunk; | |
1564 | viewer_stream_sync_tracefile_array_tail(vstream); | |
1565 | viewer_stream_close_files(vstream); | |
1566 | } | |
1567 | ||
d3e2ba59 JD |
1568 | /* |
1569 | * Send the next index for a stream. | |
1570 | * | |
1571 | * Return 0 on success or else a negative value. | |
1572 | */ | |
1573 | static | |
58eb9381 | 1574 | int viewer_get_next_index(struct relay_connection *conn) |
d3e2ba59 JD |
1575 | { |
1576 | int ret; | |
1577 | struct lttng_viewer_get_next_index request_index; | |
1578 | struct lttng_viewer_index viewer_index; | |
50adc264 | 1579 | struct ctf_packet_index packet_index; |
7591bab1 MD |
1580 | struct relay_viewer_stream *vstream = NULL; |
1581 | struct relay_stream *rstream = NULL; | |
1582 | struct ctf_trace *ctf_trace = NULL; | |
1583 | struct relay_viewer_stream *metadata_viewer_stream = NULL; | |
d3e2ba59 | 1584 | |
a0377dfe | 1585 | LTTNG_ASSERT(conn); |
d3e2ba59 JD |
1586 | |
1587 | DBG("Viewer get next index"); | |
1588 | ||
7591bab1 | 1589 | memset(&viewer_index, 0, sizeof(viewer_index)); |
eea7556c | 1590 | health_code_update(); |
2f8f53af | 1591 | |
58eb9381 | 1592 | ret = recv_request(conn->sock, &request_index, sizeof(request_index)); |
2f8f53af | 1593 | if (ret < 0) { |
d3e2ba59 JD |
1594 | goto end; |
1595 | } | |
eea7556c | 1596 | health_code_update(); |
d3e2ba59 | 1597 | |
7591bab1 | 1598 | vstream = viewer_stream_get_by_id(be64toh(request_index.stream_id)); |
6763619c | 1599 | if (!vstream) { |
a44ca2ca | 1600 | DBG("Client requested index of unknown stream id %" PRIu64, |
9b9f9f94 | 1601 | (uint64_t) be64toh(request_index.stream_id)); |
f1883937 MD |
1602 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR); |
1603 | goto send_reply; | |
2a174661 DG |
1604 | } |
1605 | ||
7591bab1 MD |
1606 | /* Use back. ref. Protected by refcounts. */ |
1607 | rstream = vstream->stream; | |
1608 | ctf_trace = rstream->trace; | |
d3e2ba59 | 1609 | |
7591bab1 MD |
1610 | /* metadata_viewer_stream may be NULL. */ |
1611 | metadata_viewer_stream = | |
1612 | ctf_trace_get_viewer_metadata_stream(ctf_trace); | |
2a174661 | 1613 | |
7591bab1 | 1614 | pthread_mutex_lock(&rstream->lock); |
d3e2ba59 JD |
1615 | |
1616 | /* | |
1617 | * The viewer should not ask for index on metadata stream. | |
1618 | */ | |
7591bab1 | 1619 | if (rstream->is_metadata) { |
c4e361a4 | 1620 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_HUP); |
d3e2ba59 JD |
1621 | goto send_reply; |
1622 | } | |
1623 | ||
b0d240a2 MD |
1624 | if (rstream->ongoing_rotation.is_set) { |
1625 | /* Rotation is ongoing, try again later. */ | |
1626 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_RETRY); | |
1627 | goto send_reply; | |
1628 | } | |
1629 | ||
1630 | if (rstream->trace->session->ongoing_rotation) { | |
1631 | /* Rotation is ongoing, try again later. */ | |
1632 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_RETRY); | |
1633 | goto send_reply; | |
1634 | } | |
1635 | ||
80516611 JG |
1636 | /* |
1637 | * Transition the viewer session into the newest trace chunk available. | |
1638 | */ | |
1639 | if (!lttng_trace_chunk_ids_equal( | |
ad8bec24 JG |
1640 | conn->viewer_session->current_trace_chunk, |
1641 | rstream->trace_chunk)) { | |
9a9c8637 | 1642 | DBG("Relay stream and viewer chunk ids differ"); |
b0d240a2 | 1643 | |
ad8bec24 JG |
1644 | ret = viewer_session_set_trace_chunk_copy( |
1645 | conn->viewer_session, | |
1646 | rstream->trace_chunk); | |
1647 | if (ret) { | |
b0d240a2 MD |
1648 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR); |
1649 | goto send_reply; | |
1650 | } | |
b0d240a2 | 1651 | } |
b0d240a2 | 1652 | |
80516611 JG |
1653 | /* |
1654 | * Transition the viewer stream into the latest trace chunk available. | |
1655 | * | |
1656 | * Note that the stream must _not_ rotate in one precise condition: | |
1657 | * the relay stream has rotated to a NULL trace chunk and the viewer | |
1658 | * stream is consuming the trace chunk that was active just before | |
1659 | * that rotation to NULL. | |
1660 | * | |
1661 | * This allows clients to consume all the packets of a trace chunk | |
1662 | * after a session's destruction. | |
1663 | */ | |
1664 | if (conn->viewer_session->current_trace_chunk != vstream->stream_file.trace_chunk && | |
1665 | !(rstream->completed_rotation_count == vstream->last_seen_rotation_count + 1 && !rstream->trace_chunk)) { | |
b0d240a2 MD |
1666 | DBG("Viewer session and viewer stream chunk differ: " |
1667 | "vsession chunk %p vstream chunk %p", | |
1668 | conn->viewer_session->current_trace_chunk, | |
1669 | vstream->stream_file.trace_chunk); | |
80516611 JG |
1670 | viewer_stream_rotate_to_trace_chunk(vstream, |
1671 | conn->viewer_session->current_trace_chunk); | |
1672 | vstream->last_seen_rotation_count = | |
1673 | rstream->completed_rotation_count; | |
d3e2ba59 JD |
1674 | } |
1675 | ||
878c34cf | 1676 | ret = check_index_status(vstream, rstream, ctf_trace, &viewer_index); |
878c34cf | 1677 | if (ret < 0) { |
7591bab1 | 1678 | goto error_put; |
878c34cf DG |
1679 | } else if (ret == 1) { |
1680 | /* | |
7591bab1 MD |
1681 | * We have no index to send and check_index_status has populated |
1682 | * viewer_index's status. | |
878c34cf | 1683 | */ |
d3e2ba59 JD |
1684 | goto send_reply; |
1685 | } | |
7591bab1 | 1686 | /* At this point, ret is 0 thus we will be able to read the index. */ |
a0377dfe | 1687 | LTTNG_ASSERT(!ret); |
d3e2ba59 | 1688 | |
b0d240a2 MD |
1689 | /* Try to open an index if one is needed for that stream. */ |
1690 | ret = try_open_index(vstream, rstream); | |
1691 | if (ret == -ENOENT) { | |
1692 | if (rstream->closed) { | |
1693 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_HUP); | |
1694 | goto send_reply; | |
1695 | } else { | |
1696 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_RETRY); | |
1697 | goto send_reply; | |
1698 | } | |
1699 | } | |
1700 | if (ret < 0) { | |
1701 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR); | |
1702 | goto send_reply; | |
1703 | } | |
1704 | ||
7591bab1 MD |
1705 | /* |
1706 | * vstream->stream_fd may be NULL if it has been closed by | |
1707 | * tracefile rotation, or if we are at the beginning of the | |
1708 | * stream. We open the data stream file here to protect against | |
1709 | * overwrite caused by tracefile rotation (in association with | |
1710 | * unlink performed before overwrite). | |
1711 | */ | |
8bb66c3c | 1712 | if (!vstream->stream_file.handle) { |
ebb29c10 JG |
1713 | char file_path[LTTNG_PATH_MAX]; |
1714 | enum lttng_trace_chunk_status status; | |
8bb66c3c | 1715 | struct fs_handle *fs_handle; |
ebb29c10 JG |
1716 | |
1717 | ret = utils_stream_file_path(rstream->path_name, | |
1718 | rstream->channel_name, rstream->tracefile_size, | |
1719 | vstream->current_tracefile_id, NULL, file_path, | |
1720 | sizeof(file_path)); | |
7591bab1 MD |
1721 | if (ret < 0) { |
1722 | goto error_put; | |
1723 | } | |
ebb29c10 | 1724 | |
3ff5c5db MD |
1725 | /* |
1726 | * It is possible the the file we are trying to open is | |
1727 | * missing if the stream has been closed (application exits with | |
1728 | * per-pid buffers) and a clear command has been performed. | |
1729 | */ | |
8bb66c3c | 1730 | status = lttng_trace_chunk_open_fs_handle( |
ebb29c10 | 1731 | vstream->stream_file.trace_chunk, |
8bb66c3c | 1732 | file_path, O_RDONLY, 0, &fs_handle, true); |
ebb29c10 | 1733 | if (status != LTTNG_TRACE_CHUNK_STATUS_OK) { |
b0d240a2 MD |
1734 | if (status == LTTNG_TRACE_CHUNK_STATUS_NO_FILE && |
1735 | rstream->closed) { | |
1736 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_HUP); | |
1737 | goto send_reply; | |
1738 | } | |
ebb29c10 | 1739 | PERROR("Failed to open trace file for viewer stream"); |
7591bab1 MD |
1740 | goto error_put; |
1741 | } | |
8bb66c3c | 1742 | vstream->stream_file.handle = fs_handle; |
d3e2ba59 JD |
1743 | } |
1744 | ||
f04a971b | 1745 | ret = check_new_streams(conn); |
4a9daf17 | 1746 | if (ret < 0) { |
7591bab1 MD |
1747 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR); |
1748 | goto send_reply; | |
4a9daf17 JD |
1749 | } else if (ret == 1) { |
1750 | viewer_index.flags |= LTTNG_VIEWER_FLAG_NEW_STREAM; | |
1751 | } | |
1752 | ||
f8f3885c MD |
1753 | ret = lttng_index_file_read(vstream->index_file, &packet_index); |
1754 | if (ret) { | |
8bb66c3c | 1755 | ERR("Relay error reading index file"); |
7591bab1 | 1756 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR); |
6b6b9a5a | 1757 | goto send_reply; |
d3e2ba59 | 1758 | } else { |
c4e361a4 | 1759 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_OK); |
a44ca2ca | 1760 | vstream->index_sent_seqcount++; |
d3e2ba59 JD |
1761 | } |
1762 | ||
1763 | /* | |
1764 | * Indexes are stored in big endian, no need to switch before sending. | |
1765 | */ | |
7591bab1 MD |
1766 | DBG("Sending viewer index for stream %" PRIu64 " offset %" PRIu64, |
1767 | rstream->stream_handle, | |
9b9f9f94 | 1768 | (uint64_t) be64toh(packet_index.offset)); |
d3e2ba59 JD |
1769 | viewer_index.offset = packet_index.offset; |
1770 | viewer_index.packet_size = packet_index.packet_size; | |
1771 | viewer_index.content_size = packet_index.content_size; | |
1772 | viewer_index.timestamp_begin = packet_index.timestamp_begin; | |
1773 | viewer_index.timestamp_end = packet_index.timestamp_end; | |
1774 | viewer_index.events_discarded = packet_index.events_discarded; | |
1775 | viewer_index.stream_id = packet_index.stream_id; | |
1776 | ||
1777 | send_reply: | |
f1883937 MD |
1778 | if (rstream) { |
1779 | pthread_mutex_unlock(&rstream->lock); | |
1780 | } | |
7591bab1 MD |
1781 | |
1782 | if (metadata_viewer_stream) { | |
1783 | pthread_mutex_lock(&metadata_viewer_stream->stream->lock); | |
1784 | DBG("get next index metadata check: recv %" PRIu64 | |
1785 | " sent %" PRIu64, | |
1786 | metadata_viewer_stream->stream->metadata_received, | |
1787 | metadata_viewer_stream->metadata_sent); | |
1788 | if (!metadata_viewer_stream->stream->metadata_received || | |
1789 | metadata_viewer_stream->stream->metadata_received > | |
1790 | metadata_viewer_stream->metadata_sent) { | |
1791 | viewer_index.flags |= LTTNG_VIEWER_FLAG_NEW_METADATA; | |
1792 | } | |
1793 | pthread_mutex_unlock(&metadata_viewer_stream->stream->lock); | |
1794 | } | |
1795 | ||
d3e2ba59 | 1796 | viewer_index.flags = htobe32(viewer_index.flags); |
eea7556c | 1797 | health_code_update(); |
2f8f53af | 1798 | |
58eb9381 | 1799 | ret = send_response(conn->sock, &viewer_index, sizeof(viewer_index)); |
d3e2ba59 | 1800 | if (ret < 0) { |
7591bab1 | 1801 | goto end; |
d3e2ba59 | 1802 | } |
eea7556c | 1803 | health_code_update(); |
d3e2ba59 | 1804 | |
9237e6a1 MD |
1805 | if (vstream) { |
1806 | DBG("Index %" PRIu64 " for stream %" PRIu64 " sent", | |
a44ca2ca | 1807 | vstream->index_sent_seqcount, |
9237e6a1 MD |
1808 | vstream->stream->stream_handle); |
1809 | } | |
d3e2ba59 | 1810 | end: |
7591bab1 MD |
1811 | if (metadata_viewer_stream) { |
1812 | viewer_stream_put(metadata_viewer_stream); | |
1813 | } | |
1814 | if (vstream) { | |
1815 | viewer_stream_put(vstream); | |
1816 | } | |
1817 | return ret; | |
1818 | ||
1819 | error_put: | |
1820 | pthread_mutex_unlock(&rstream->lock); | |
1821 | if (metadata_viewer_stream) { | |
1822 | viewer_stream_put(metadata_viewer_stream); | |
1823 | } | |
1824 | viewer_stream_put(vstream); | |
d3e2ba59 JD |
1825 | return ret; |
1826 | } | |
1827 | ||
1828 | /* | |
1829 | * Send the next index for a stream | |
1830 | * | |
1831 | * Return 0 on success or else a negative value. | |
1832 | */ | |
1833 | static | |
58eb9381 | 1834 | int viewer_get_packet(struct relay_connection *conn) |
d3e2ba59 | 1835 | { |
b6025e94 | 1836 | int ret; |
a5df8828 | 1837 | off_t lseek_ret; |
553b2adb | 1838 | char *reply = NULL; |
d3e2ba59 | 1839 | struct lttng_viewer_get_packet get_packet_info; |
553b2adb | 1840 | struct lttng_viewer_trace_packet reply_header; |
7591bab1 | 1841 | struct relay_viewer_stream *vstream = NULL; |
553b2adb | 1842 | uint32_t reply_size = sizeof(reply_header); |
b6025e94 JR |
1843 | uint32_t packet_data_len = 0; |
1844 | ssize_t read_len; | |
8bb66c3c | 1845 | uint64_t stream_id; |
d3e2ba59 JD |
1846 | |
1847 | DBG2("Relay get data packet"); | |
1848 | ||
eea7556c | 1849 | health_code_update(); |
2f8f53af | 1850 | |
7591bab1 MD |
1851 | ret = recv_request(conn->sock, &get_packet_info, |
1852 | sizeof(get_packet_info)); | |
2f8f53af | 1853 | if (ret < 0) { |
d3e2ba59 JD |
1854 | goto end; |
1855 | } | |
eea7556c | 1856 | health_code_update(); |
d3e2ba59 | 1857 | |
0233a6a5 | 1858 | /* From this point on, the error label can be reached. */ |
553b2adb | 1859 | memset(&reply_header, 0, sizeof(reply_header)); |
8bb66c3c | 1860 | stream_id = (uint64_t) be64toh(get_packet_info.stream_id); |
0233a6a5 | 1861 | |
8bb66c3c | 1862 | vstream = viewer_stream_get_by_id(stream_id); |
7591bab1 | 1863 | if (!vstream) { |
a44ca2ca | 1864 | DBG("Client requested packet of unknown stream id %" PRIu64, |
8bb66c3c | 1865 | stream_id); |
553b2adb JG |
1866 | reply_header.status = htobe32(LTTNG_VIEWER_GET_PACKET_ERR); |
1867 | goto send_reply_nolock; | |
b6025e94 JR |
1868 | } else { |
1869 | packet_data_len = be32toh(get_packet_info.len); | |
553b2adb | 1870 | reply_size += packet_data_len; |
d3e2ba59 | 1871 | } |
2a174661 | 1872 | |
ac497a37 | 1873 | reply = (char *) zmalloc(reply_size); |
553b2adb JG |
1874 | if (!reply) { |
1875 | PERROR("packet reply zmalloc"); | |
1876 | reply_size = sizeof(reply_header); | |
d3e2ba59 JD |
1877 | goto error; |
1878 | } | |
1879 | ||
b6025e94 | 1880 | pthread_mutex_lock(&vstream->stream->lock); |
8bb66c3c | 1881 | lseek_ret = fs_handle_seek(vstream->stream_file.handle, |
ebb29c10 | 1882 | be64toh(get_packet_info.offset), SEEK_SET); |
a5df8828 | 1883 | if (lseek_ret < 0) { |
8bb66c3c JG |
1884 | PERROR("Failed to seek file system handle of viewer stream %" PRIu64 |
1885 | " to offset %" PRIu64, | |
1886 | stream_id, | |
ebb29c10 | 1887 | (uint64_t) be64toh(get_packet_info.offset)); |
7591bab1 | 1888 | goto error; |
d3e2ba59 | 1889 | } |
8bb66c3c | 1890 | read_len = fs_handle_read(vstream->stream_file.handle, |
ebb29c10 | 1891 | reply + sizeof(reply_header), packet_data_len); |
b6025e94 | 1892 | if (read_len < packet_data_len) { |
8bb66c3c JG |
1893 | PERROR("Failed to read from file system handle of viewer stream id %" PRIu64 |
1894 | ", offset: %" PRIu64, | |
1895 | stream_id, | |
9b9f9f94 | 1896 | (uint64_t) be64toh(get_packet_info.offset)); |
7591bab1 | 1897 | goto error; |
d3e2ba59 | 1898 | } |
553b2adb JG |
1899 | reply_header.status = htobe32(LTTNG_VIEWER_GET_PACKET_OK); |
1900 | reply_header.len = htobe32(packet_data_len); | |
d3e2ba59 JD |
1901 | goto send_reply; |
1902 | ||
1903 | error: | |
f28ecb10 JG |
1904 | /* No payload to send on error. */ |
1905 | reply_size = sizeof(reply_header); | |
553b2adb | 1906 | reply_header.status = htobe32(LTTNG_VIEWER_GET_PACKET_ERR); |
d3e2ba59 JD |
1907 | |
1908 | send_reply: | |
7591bab1 MD |
1909 | if (vstream) { |
1910 | pthread_mutex_unlock(&vstream->stream->lock); | |
1911 | } | |
1912 | send_reply_nolock: | |
eea7556c MD |
1913 | |
1914 | health_code_update(); | |
2f8f53af | 1915 | |
553b2adb JG |
1916 | if (reply) { |
1917 | memcpy(reply, &reply_header, sizeof(reply_header)); | |
1918 | ret = send_response(conn->sock, reply, reply_size); | |
1919 | } else { | |
1920 | /* No reply to send. */ | |
1921 | ret = send_response(conn->sock, &reply_header, | |
1922 | reply_size); | |
1923 | } | |
1924 | ||
b6025e94 | 1925 | health_code_update(); |
d3e2ba59 | 1926 | if (ret < 0) { |
b6025e94 | 1927 | PERROR("sendmsg of packet data failed"); |
7591bab1 | 1928 | goto end_free; |
d3e2ba59 | 1929 | } |
d3e2ba59 | 1930 | |
8bb66c3c | 1931 | DBG("Sent %u bytes for stream %" PRIu64, reply_size, stream_id); |
d3e2ba59 | 1932 | |
7591bab1 | 1933 | end_free: |
553b2adb | 1934 | free(reply); |
d3e2ba59 | 1935 | end: |
7591bab1 MD |
1936 | if (vstream) { |
1937 | viewer_stream_put(vstream); | |
1938 | } | |
d3e2ba59 JD |
1939 | return ret; |
1940 | } | |
1941 | ||
1942 | /* | |
1943 | * Send the session's metadata | |
1944 | * | |
1945 | * Return 0 on success else a negative value. | |
1946 | */ | |
1947 | static | |
58eb9381 | 1948 | int viewer_get_metadata(struct relay_connection *conn) |
d3e2ba59 JD |
1949 | { |
1950 | int ret = 0; | |
8bb66c3c | 1951 | int fd = -1; |
d3e2ba59 JD |
1952 | ssize_t read_len; |
1953 | uint64_t len = 0; | |
1954 | char *data = NULL; | |
1955 | struct lttng_viewer_get_metadata request; | |
1956 | struct lttng_viewer_metadata_packet reply; | |
7591bab1 | 1957 | struct relay_viewer_stream *vstream = NULL; |
d3e2ba59 | 1958 | |
a0377dfe | 1959 | LTTNG_ASSERT(conn); |
d3e2ba59 JD |
1960 | |
1961 | DBG("Relay get metadata"); | |
1962 | ||
eea7556c | 1963 | health_code_update(); |
2f8f53af | 1964 | |
58eb9381 | 1965 | ret = recv_request(conn->sock, &request, sizeof(request)); |
2f8f53af | 1966 | if (ret < 0) { |
d3e2ba59 JD |
1967 | goto end; |
1968 | } | |
eea7556c | 1969 | health_code_update(); |
d3e2ba59 | 1970 | |
53efb85a MD |
1971 | memset(&reply, 0, sizeof(reply)); |
1972 | ||
7591bab1 MD |
1973 | vstream = viewer_stream_get_by_id(be64toh(request.stream_id)); |
1974 | if (!vstream) { | |
3b463131 MD |
1975 | /* |
1976 | * The metadata stream can be closed by a CLOSE command | |
1977 | * just before we attach. It can also be closed by | |
1978 | * per-pid tracing during tracing. Therefore, it is | |
1979 | * possible that we cannot find this viewer stream. | |
1980 | * Reply back to the client with an error if we cannot | |
1981 | * find it. | |
1982 | */ | |
a44ca2ca | 1983 | DBG("Client requested metadata of unknown stream id %" PRIu64, |
9b9f9f94 | 1984 | (uint64_t) be64toh(request.stream_id)); |
3b463131 | 1985 | reply.status = htobe32(LTTNG_VIEWER_METADATA_ERR); |
7591bab1 | 1986 | goto send_reply; |
d3e2ba59 | 1987 | } |
7591bab1 MD |
1988 | pthread_mutex_lock(&vstream->stream->lock); |
1989 | if (!vstream->stream->is_metadata) { | |
1990 | ERR("Invalid metadata stream"); | |
6763619c JD |
1991 | goto error; |
1992 | } | |
1993 | ||
b0d240a2 | 1994 | if (vstream->metadata_sent >= vstream->stream->metadata_received) { |
94f73d08 MD |
1995 | /* |
1996 | * The live viewers expect to receive a NO_NEW_METADATA | |
1997 | * status before a stream disappears, otherwise they abort the | |
1998 | * entire live connection when receiving an error status. | |
b0d240a2 MD |
1999 | * |
2000 | * Clear feature resets the metadata_sent to 0 until the | |
2001 | * same metadata is received again. | |
94f73d08 | 2002 | */ |
c4e361a4 | 2003 | reply.status = htobe32(LTTNG_VIEWER_NO_NEW_METADATA); |
94f73d08 MD |
2004 | /* |
2005 | * The live viewer considers a closed 0 byte metadata stream as | |
2006 | * an error. | |
2007 | */ | |
2008 | if (vstream->metadata_sent > 0) { | |
2009 | vstream->stream->no_new_metadata_notified = true; | |
2010 | if (vstream->stream->closed) { | |
2011 | /* Release ownership for the viewer metadata stream. */ | |
2012 | viewer_stream_put(vstream); | |
2013 | } | |
2014 | } | |
d3e2ba59 JD |
2015 | goto send_reply; |
2016 | } | |
2017 | ||
ad8bec24 JG |
2018 | if (vstream->stream->trace_chunk && |
2019 | !lttng_trace_chunk_ids_equal( | |
2020 | conn->viewer_session->current_trace_chunk, | |
2021 | vstream->stream->trace_chunk)) { | |
2022 | /* A rotation has occurred on the relay stream. */ | |
2023 | DBG("Metadata relay stream and viewer chunk ids differ"); | |
2024 | ||
2025 | ret = viewer_session_set_trace_chunk_copy( | |
2026 | conn->viewer_session, | |
2027 | vstream->stream->trace_chunk); | |
2028 | if (ret) { | |
2029 | reply.status = htobe32(LTTNG_VIEWER_METADATA_ERR); | |
2030 | goto send_reply; | |
2031 | } | |
2032 | } | |
2033 | ||
87250ba1 JG |
2034 | if (conn->viewer_session->current_trace_chunk && |
2035 | conn->viewer_session->current_trace_chunk != | |
2036 | vstream->stream_file.trace_chunk) { | |
ad8bec24 JG |
2037 | bool acquired_reference; |
2038 | ||
2039 | DBG("Viewer session and viewer stream chunk differ: " | |
2040 | "vsession chunk %p vstream chunk %p", | |
2041 | conn->viewer_session->current_trace_chunk, | |
2042 | vstream->stream_file.trace_chunk); | |
2043 | lttng_trace_chunk_put(vstream->stream_file.trace_chunk); | |
2044 | acquired_reference = lttng_trace_chunk_get(conn->viewer_session->current_trace_chunk); | |
a0377dfe | 2045 | LTTNG_ASSERT(acquired_reference); |
ad8bec24 JG |
2046 | vstream->stream_file.trace_chunk = |
2047 | conn->viewer_session->current_trace_chunk; | |
2048 | viewer_stream_close_files(vstream); | |
2049 | } | |
2050 | ||
b0d240a2 MD |
2051 | len = vstream->stream->metadata_received - vstream->metadata_sent; |
2052 | ||
87250ba1 JG |
2053 | if (!vstream->stream_file.trace_chunk) { |
2054 | reply.status = htobe32(LTTNG_VIEWER_NO_NEW_METADATA); | |
2055 | len = 0; | |
2056 | goto send_reply; | |
2057 | } else if (vstream->stream_file.trace_chunk && | |
2058 | !vstream->stream_file.handle && len > 0) { | |
2059 | /* | |
2060 | * Either this is the first time the metadata file is read, or a | |
2061 | * rotation of the corresponding relay stream has occurred. | |
2062 | */ | |
8bb66c3c | 2063 | struct fs_handle *fs_handle; |
ebb29c10 JG |
2064 | char file_path[LTTNG_PATH_MAX]; |
2065 | enum lttng_trace_chunk_status status; | |
2066 | struct relay_stream *rstream = vstream->stream; | |
2067 | ||
2068 | ret = utils_stream_file_path(rstream->path_name, | |
2069 | rstream->channel_name, rstream->tracefile_size, | |
2070 | vstream->current_tracefile_id, NULL, file_path, | |
2071 | sizeof(file_path)); | |
d3e2ba59 JD |
2072 | if (ret < 0) { |
2073 | goto error; | |
2074 | } | |
ebb29c10 | 2075 | |
3ff5c5db MD |
2076 | /* |
2077 | * It is possible the the metadata file we are trying to open is | |
2078 | * missing if the stream has been closed (application exits with | |
2079 | * per-pid buffers) and a clear command has been performed. | |
2080 | */ | |
8bb66c3c | 2081 | status = lttng_trace_chunk_open_fs_handle( |
ebb29c10 | 2082 | vstream->stream_file.trace_chunk, |
8bb66c3c | 2083 | file_path, O_RDONLY, 0, &fs_handle, true); |
ebb29c10 | 2084 | if (status != LTTNG_TRACE_CHUNK_STATUS_OK) { |
b0d240a2 MD |
2085 | if (status == LTTNG_TRACE_CHUNK_STATUS_NO_FILE) { |
2086 | reply.status = htobe32(LTTNG_VIEWER_NO_NEW_METADATA); | |
2087 | len = 0; | |
2088 | if (vstream->stream->closed) { | |
2089 | viewer_stream_put(vstream); | |
2090 | } | |
2091 | goto send_reply; | |
2092 | } | |
ebb29c10 | 2093 | PERROR("Failed to open metadata file for viewer stream"); |
d3e2ba59 JD |
2094 | goto error; |
2095 | } | |
8bb66c3c | 2096 | vstream->stream_file.handle = fs_handle; |
ad8bec24 JG |
2097 | |
2098 | if (vstream->metadata_sent != 0) { | |
2099 | /* | |
2100 | * The client does not expect to receive any metadata | |
2101 | * it has received and metadata files in successive | |
2102 | * chunks must be a strict superset of one another. | |
2103 | * | |
2104 | * Skip the first `metadata_sent` bytes to ensure | |
2105 | * they are not sent a second time to the client. | |
2106 | * | |
2107 | * Baring a block layer error or an internal error, | |
2108 | * this seek should not fail as | |
2109 | * `vstream->stream->metadata_received` is reset when | |
2110 | * a relay stream is rotated. If this is reached, it is | |
2111 | * safe to assume that | |
2112 | * `metadata_received` > `metadata_sent`. | |
2113 | */ | |
2114 | const off_t seek_ret = fs_handle_seek(fs_handle, | |
2115 | vstream->metadata_sent, SEEK_SET); | |
2116 | ||
2117 | if (seek_ret < 0) { | |
2118 | PERROR("Failed to seek metadata viewer stream file to `sent` position: pos = %" PRId64, | |
2119 | vstream->metadata_sent); | |
2120 | reply.status = htobe32(LTTNG_VIEWER_METADATA_ERR); | |
2121 | goto send_reply; | |
2122 | } | |
2123 | } | |
d3e2ba59 JD |
2124 | } |
2125 | ||
2126 | reply.len = htobe64(len); | |
ac497a37 | 2127 | data = (char *) zmalloc(len); |
d3e2ba59 JD |
2128 | if (!data) { |
2129 | PERROR("viewer metadata zmalloc"); | |
2130 | goto error; | |
2131 | } | |
2132 | ||
8bb66c3c JG |
2133 | fd = fs_handle_get_fd(vstream->stream_file.handle); |
2134 | if (fd < 0) { | |
2135 | ERR("Failed to restore viewer stream file system handle"); | |
2136 | goto error; | |
2137 | } | |
2138 | read_len = lttng_read(fd, data, len); | |
2139 | fs_handle_put_fd(vstream->stream_file.handle); | |
2140 | fd = -1; | |
6cd525e8 | 2141 | if (read_len < len) { |
ad8bec24 JG |
2142 | if (read_len < 0) { |
2143 | PERROR("Failed to read metadata file"); | |
2144 | goto error; | |
2145 | } else { | |
2146 | /* | |
2147 | * A clear has been performed which prevents the relay | |
2148 | * from sending `len` bytes of metadata. | |
2149 | * | |
2150 | * It is important not to send any metadata if we | |
2151 | * couldn't read all the available metadata in one shot: | |
2152 | * sending partial metadata can cause the client to | |
2153 | * attempt to parse an incomplete (incoherent) metadata | |
2154 | * stream, which would result in an error. | |
2155 | */ | |
2156 | const off_t seek_ret = fs_handle_seek( | |
2157 | vstream->stream_file.handle, -read_len, | |
2158 | SEEK_CUR); | |
2159 | ||
cfa1e2c2 | 2160 | DBG("Failed to read metadata: requested = %" PRIu64 ", got = %zd", |
ad8bec24 JG |
2161 | len, read_len); |
2162 | read_len = 0; | |
2163 | len = 0; | |
2164 | if (seek_ret < 0) { | |
2165 | PERROR("Failed to restore metadata file position after partial read"); | |
2166 | ret = -1; | |
2167 | goto error; | |
2168 | } | |
2169 | } | |
d3e2ba59 | 2170 | } |
7591bab1 | 2171 | vstream->metadata_sent += read_len; |
c4e361a4 | 2172 | reply.status = htobe32(LTTNG_VIEWER_METADATA_OK); |
7591bab1 | 2173 | |
d3e2ba59 JD |
2174 | goto send_reply; |
2175 | ||
2176 | error: | |
c4e361a4 | 2177 | reply.status = htobe32(LTTNG_VIEWER_METADATA_ERR); |
d3e2ba59 JD |
2178 | |
2179 | send_reply: | |
eea7556c | 2180 | health_code_update(); |
7591bab1 MD |
2181 | if (vstream) { |
2182 | pthread_mutex_unlock(&vstream->stream->lock); | |
2183 | } | |
58eb9381 | 2184 | ret = send_response(conn->sock, &reply, sizeof(reply)); |
d3e2ba59 | 2185 | if (ret < 0) { |
7591bab1 | 2186 | goto end_free; |
d3e2ba59 | 2187 | } |
eea7556c | 2188 | health_code_update(); |
d3e2ba59 JD |
2189 | |
2190 | if (len > 0) { | |
58eb9381 | 2191 | ret = send_response(conn->sock, data, len); |
d3e2ba59 | 2192 | if (ret < 0) { |
7591bab1 | 2193 | goto end_free; |
d3e2ba59 JD |
2194 | } |
2195 | } | |
2196 | ||
2197 | DBG("Sent %" PRIu64 " bytes of metadata for stream %" PRIu64, len, | |
9b9f9f94 | 2198 | (uint64_t) be64toh(request.stream_id)); |
d3e2ba59 JD |
2199 | |
2200 | DBG("Metadata sent"); | |
2201 | ||
7591bab1 | 2202 | end_free: |
d3e2ba59 | 2203 | free(data); |
d3e2ba59 | 2204 | end: |
7591bab1 MD |
2205 | if (vstream) { |
2206 | viewer_stream_put(vstream); | |
2207 | } | |
d3e2ba59 JD |
2208 | return ret; |
2209 | } | |
2210 | ||
c3b7390b JD |
2211 | /* |
2212 | * Create a viewer session. | |
2213 | * | |
2214 | * Return 0 on success or else a negative value. | |
2215 | */ | |
2216 | static | |
2217 | int viewer_create_session(struct relay_connection *conn) | |
2218 | { | |
2219 | int ret; | |
2220 | struct lttng_viewer_create_session_response resp; | |
2221 | ||
2222 | DBG("Viewer create session received"); | |
2223 | ||
53efb85a | 2224 | memset(&resp, 0, sizeof(resp)); |
c3b7390b | 2225 | resp.status = htobe32(LTTNG_VIEWER_CREATE_SESSION_OK); |
7591bab1 | 2226 | conn->viewer_session = viewer_session_create(); |
c3b7390b JD |
2227 | if (!conn->viewer_session) { |
2228 | ERR("Allocation viewer session"); | |
2229 | resp.status = htobe32(LTTNG_VIEWER_CREATE_SESSION_ERR); | |
2230 | goto send_reply; | |
2231 | } | |
c3b7390b JD |
2232 | |
2233 | send_reply: | |
2234 | health_code_update(); | |
2235 | ret = send_response(conn->sock, &resp, sizeof(resp)); | |
2236 | if (ret < 0) { | |
2237 | goto end; | |
2238 | } | |
2239 | health_code_update(); | |
2240 | ret = 0; | |
2241 | ||
2242 | end: | |
2243 | return ret; | |
2244 | } | |
2245 | ||
d62023be JD |
2246 | /* |
2247 | * Detach a viewer session. | |
2248 | * | |
2249 | * Return 0 on success or else a negative value. | |
2250 | */ | |
2251 | static | |
2252 | int viewer_detach_session(struct relay_connection *conn) | |
2253 | { | |
2254 | int ret; | |
2255 | struct lttng_viewer_detach_session_response response; | |
2256 | struct lttng_viewer_detach_session_request request; | |
2257 | struct relay_session *session = NULL; | |
2258 | uint64_t viewer_session_to_close; | |
2259 | ||
2260 | DBG("Viewer detach session received"); | |
2261 | ||
a0377dfe | 2262 | LTTNG_ASSERT(conn); |
d62023be JD |
2263 | |
2264 | health_code_update(); | |
2265 | ||
2266 | /* Receive the request from the connected client. */ | |
2267 | ret = recv_request(conn->sock, &request, sizeof(request)); | |
2268 | if (ret < 0) { | |
2269 | goto end; | |
2270 | } | |
2271 | viewer_session_to_close = be64toh(request.session_id); | |
2272 | ||
2273 | if (!conn->viewer_session) { | |
2274 | DBG("Client trying to detach before creating a live viewer session"); | |
2275 | response.status = htobe32(LTTNG_VIEWER_DETACH_SESSION_ERR); | |
2276 | goto send_reply; | |
2277 | } | |
2278 | ||
2279 | health_code_update(); | |
2280 | ||
2281 | memset(&response, 0, sizeof(response)); | |
2282 | DBG("Detaching from session ID %" PRIu64, viewer_session_to_close); | |
2283 | ||
2284 | session = session_get_by_id(be64toh(request.session_id)); | |
2285 | if (!session) { | |
2286 | DBG("Relay session %" PRIu64 " not found", | |
9b9f9f94 | 2287 | (uint64_t) be64toh(request.session_id)); |
d62023be JD |
2288 | response.status = htobe32(LTTNG_VIEWER_DETACH_SESSION_UNK); |
2289 | goto send_reply; | |
2290 | } | |
2291 | ||
2292 | ret = viewer_session_is_attached(conn->viewer_session, session); | |
2293 | if (ret != 1) { | |
2294 | DBG("Not attached to this session"); | |
2295 | response.status = htobe32(LTTNG_VIEWER_DETACH_SESSION_ERR); | |
2296 | goto send_reply_put; | |
2297 | } | |
2298 | ||
2299 | viewer_session_close_one_session(conn->viewer_session, session); | |
2300 | response.status = htobe32(LTTNG_VIEWER_DETACH_SESSION_OK); | |
2301 | DBG("Session %" PRIu64 " detached.", viewer_session_to_close); | |
2302 | ||
2303 | send_reply_put: | |
2304 | session_put(session); | |
2305 | ||
2306 | send_reply: | |
2307 | health_code_update(); | |
2308 | ret = send_response(conn->sock, &response, sizeof(response)); | |
2309 | if (ret < 0) { | |
2310 | goto end; | |
2311 | } | |
2312 | health_code_update(); | |
2313 | ret = 0; | |
2314 | ||
2315 | end: | |
2316 | return ret; | |
2317 | } | |
c3b7390b | 2318 | |
d3e2ba59 JD |
2319 | /* |
2320 | * live_relay_unknown_command: send -1 if received unknown command | |
2321 | */ | |
2322 | static | |
58eb9381 | 2323 | void live_relay_unknown_command(struct relay_connection *conn) |
d3e2ba59 JD |
2324 | { |
2325 | struct lttcomm_relayd_generic_reply reply; | |
d3e2ba59 | 2326 | |
53efb85a | 2327 | memset(&reply, 0, sizeof(reply)); |
d3e2ba59 | 2328 | reply.ret_code = htobe32(LTTNG_ERR_UNK); |
58eb9381 | 2329 | (void) send_response(conn->sock, &reply, sizeof(reply)); |
d3e2ba59 JD |
2330 | } |
2331 | ||
2332 | /* | |
2333 | * Process the commands received on the control socket | |
2334 | */ | |
2335 | static | |
2336 | int process_control(struct lttng_viewer_cmd *recv_hdr, | |
58eb9381 | 2337 | struct relay_connection *conn) |
d3e2ba59 JD |
2338 | { |
2339 | int ret = 0; | |
2f8f53af DG |
2340 | uint32_t msg_value; |
2341 | ||
2f8f53af DG |
2342 | msg_value = be32toh(recv_hdr->cmd); |
2343 | ||
2344 | /* | |
2345 | * Make sure we've done the version check before any command other then a | |
2346 | * new client connection. | |
2347 | */ | |
c4e361a4 | 2348 | if (msg_value != LTTNG_VIEWER_CONNECT && !conn->version_check_done) { |
58eb9381 | 2349 | ERR("Viewer conn value %" PRIu32 " before version check", msg_value); |
2f8f53af DG |
2350 | ret = -1; |
2351 | goto end; | |
2352 | } | |
d3e2ba59 | 2353 | |
2f8f53af | 2354 | switch (msg_value) { |
c4e361a4 | 2355 | case LTTNG_VIEWER_CONNECT: |
58eb9381 | 2356 | ret = viewer_connect(conn); |
d3e2ba59 | 2357 | break; |
c4e361a4 | 2358 | case LTTNG_VIEWER_LIST_SESSIONS: |
58eb9381 | 2359 | ret = viewer_list_sessions(conn); |
d3e2ba59 | 2360 | break; |
c4e361a4 | 2361 | case LTTNG_VIEWER_ATTACH_SESSION: |
58eb9381 | 2362 | ret = viewer_attach_session(conn); |
d3e2ba59 | 2363 | break; |
c4e361a4 | 2364 | case LTTNG_VIEWER_GET_NEXT_INDEX: |
58eb9381 | 2365 | ret = viewer_get_next_index(conn); |
d3e2ba59 | 2366 | break; |
c4e361a4 | 2367 | case LTTNG_VIEWER_GET_PACKET: |
58eb9381 | 2368 | ret = viewer_get_packet(conn); |
d3e2ba59 | 2369 | break; |
c4e361a4 | 2370 | case LTTNG_VIEWER_GET_METADATA: |
58eb9381 | 2371 | ret = viewer_get_metadata(conn); |
d3e2ba59 | 2372 | break; |
c4e361a4 | 2373 | case LTTNG_VIEWER_GET_NEW_STREAMS: |
58eb9381 | 2374 | ret = viewer_get_new_streams(conn); |
80e8027a | 2375 | break; |
c3b7390b JD |
2376 | case LTTNG_VIEWER_CREATE_SESSION: |
2377 | ret = viewer_create_session(conn); | |
2378 | break; | |
d62023be JD |
2379 | case LTTNG_VIEWER_DETACH_SESSION: |
2380 | ret = viewer_detach_session(conn); | |
2381 | break; | |
d3e2ba59 | 2382 | default: |
7591bab1 MD |
2383 | ERR("Received unknown viewer command (%u)", |
2384 | be32toh(recv_hdr->cmd)); | |
58eb9381 | 2385 | live_relay_unknown_command(conn); |
d3e2ba59 JD |
2386 | ret = -1; |
2387 | goto end; | |
2388 | } | |
2389 | ||
2390 | end: | |
2391 | return ret; | |
2392 | } | |
2393 | ||
2394 | static | |
58eb9381 | 2395 | void cleanup_connection_pollfd(struct lttng_poll_event *events, int pollfd) |
d3e2ba59 JD |
2396 | { |
2397 | int ret; | |
2398 | ||
58eb9381 | 2399 | (void) lttng_poll_del(events, pollfd); |
d3e2ba59 | 2400 | |
29555a78 JG |
2401 | ret = fd_tracker_close_unsuspendable_fd(the_fd_tracker, &pollfd, 1, |
2402 | fd_tracker_util_close_fd, NULL); | |
d3e2ba59 JD |
2403 | if (ret < 0) { |
2404 | ERR("Closing pollfd %d", pollfd); | |
2405 | } | |
2406 | } | |
2407 | ||
d3e2ba59 JD |
2408 | /* |
2409 | * This thread does the actual work | |
2410 | */ | |
2411 | static | |
2412 | void *thread_worker(void *data) | |
2413 | { | |
2414 | int ret, err = -1; | |
2415 | uint32_t nb_fd; | |
d3e2ba59 | 2416 | struct lttng_poll_event events; |
7591bab1 | 2417 | struct lttng_ht *viewer_connections_ht; |
d3e2ba59 JD |
2418 | struct lttng_ht_iter iter; |
2419 | struct lttng_viewer_cmd recv_hdr; | |
302d8906 | 2420 | struct relay_connection *destroy_conn; |
d3e2ba59 JD |
2421 | |
2422 | DBG("[thread] Live viewer relay worker started"); | |
2423 | ||
2424 | rcu_register_thread(); | |
2425 | ||
eea7556c MD |
2426 | health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_WORKER); |
2427 | ||
9b5e0863 MD |
2428 | if (testpoint(relayd_thread_live_worker)) { |
2429 | goto error_testpoint; | |
2430 | } | |
2431 | ||
d3e2ba59 | 2432 | /* table of connections indexed on socket */ |
7591bab1 MD |
2433 | viewer_connections_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
2434 | if (!viewer_connections_ht) { | |
2435 | goto viewer_connections_ht_error; | |
d3e2ba59 JD |
2436 | } |
2437 | ||
35bc1f58 JG |
2438 | ret = create_named_thread_poll_set(&events, 2, |
2439 | "Live viewer worker thread epoll"); | |
d3e2ba59 JD |
2440 | if (ret < 0) { |
2441 | goto error_poll_create; | |
2442 | } | |
2443 | ||
58eb9381 | 2444 | ret = lttng_poll_add(&events, live_conn_pipe[0], LPOLLIN | LPOLLRDHUP); |
d3e2ba59 JD |
2445 | if (ret < 0) { |
2446 | goto error; | |
2447 | } | |
2448 | ||
2449 | restart: | |
2450 | while (1) { | |
2451 | int i; | |
2452 | ||
eea7556c MD |
2453 | health_code_update(); |
2454 | ||
d3e2ba59 JD |
2455 | /* Infinite blocking call, waiting for transmission */ |
2456 | DBG3("Relayd live viewer worker thread polling..."); | |
eea7556c | 2457 | health_poll_entry(); |
d3e2ba59 | 2458 | ret = lttng_poll_wait(&events, -1); |
eea7556c | 2459 | health_poll_exit(); |
d3e2ba59 JD |
2460 | if (ret < 0) { |
2461 | /* | |
2462 | * Restart interrupted system call. | |
2463 | */ | |
2464 | if (errno == EINTR) { | |
2465 | goto restart; | |
2466 | } | |
2467 | goto error; | |
2468 | } | |
2469 | ||
2470 | nb_fd = ret; | |
2471 | ||
2472 | /* | |
2473 | * Process control. The control connection is prioritised so we don't | |
2474 | * starve it with high throughput tracing data on the data | |
2475 | * connection. | |
2476 | */ | |
2477 | for (i = 0; i < nb_fd; i++) { | |
2478 | /* Fetch once the poll data */ | |
2479 | uint32_t revents = LTTNG_POLL_GETEV(&events, i); | |
2480 | int pollfd = LTTNG_POLL_GETFD(&events, i); | |
2481 | ||
eea7556c MD |
2482 | health_code_update(); |
2483 | ||
d3e2ba59 | 2484 | /* Thread quit pipe has been closed. Killing thread. */ |
bcf4a440 | 2485 | ret = check_thread_quit_pipe(pollfd, revents); |
d3e2ba59 JD |
2486 | if (ret) { |
2487 | err = 0; | |
2488 | goto exit; | |
2489 | } | |
2490 | ||
7591bab1 | 2491 | /* Inspect the relay conn pipe for new connection. */ |
58eb9381 | 2492 | if (pollfd == live_conn_pipe[0]) { |
03e43155 | 2493 | if (revents & LPOLLIN) { |
302d8906 JG |
2494 | struct relay_connection *conn; |
2495 | ||
7591bab1 MD |
2496 | ret = lttng_read(live_conn_pipe[0], |
2497 | &conn, sizeof(conn)); | |
d3e2ba59 JD |
2498 | if (ret < 0) { |
2499 | goto error; | |
2500 | } | |
73039936 FD |
2501 | ret = lttng_poll_add(&events, |
2502 | conn->sock->fd, | |
58eb9381 | 2503 | LPOLLIN | LPOLLRDHUP); |
73039936 FD |
2504 | if (ret) { |
2505 | ERR("Failed to add new live connection file descriptor to poll set"); | |
2506 | goto error; | |
2507 | } | |
7591bab1 MD |
2508 | connection_ht_add(viewer_connections_ht, conn); |
2509 | DBG("Connection socket %d added to poll", conn->sock->fd); | |
03e43155 MD |
2510 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
2511 | ERR("Relay live pipe error"); | |
2512 | goto error; | |
2513 | } else { | |
2514 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
2515 | goto error; | |
d3e2ba59 | 2516 | } |
58eb9381 | 2517 | } else { |
7591bab1 | 2518 | /* Connection activity. */ |
302d8906 JG |
2519 | struct relay_connection *conn; |
2520 | ||
7591bab1 MD |
2521 | conn = connection_get_by_sock(viewer_connections_ht, pollfd); |
2522 | if (!conn) { | |
2523 | continue; | |
2524 | } | |
58eb9381 | 2525 | |
03e43155 | 2526 | if (revents & LPOLLIN) { |
58eb9381 DG |
2527 | ret = conn->sock->ops->recvmsg(conn->sock, &recv_hdr, |
2528 | sizeof(recv_hdr), 0); | |
d3e2ba59 | 2529 | if (ret <= 0) { |
7591bab1 | 2530 | /* Connection closed. */ |
58eb9381 | 2531 | cleanup_connection_pollfd(&events, pollfd); |
7591bab1 MD |
2532 | /* Put "create" ownership reference. */ |
2533 | connection_put(conn); | |
58eb9381 | 2534 | DBG("Viewer control conn closed with %d", pollfd); |
d3e2ba59 | 2535 | } else { |
58eb9381 | 2536 | ret = process_control(&recv_hdr, conn); |
d3e2ba59 JD |
2537 | if (ret < 0) { |
2538 | /* Clear the session on error. */ | |
58eb9381 | 2539 | cleanup_connection_pollfd(&events, pollfd); |
7591bab1 MD |
2540 | /* Put "create" ownership reference. */ |
2541 | connection_put(conn); | |
d3e2ba59 JD |
2542 | DBG("Viewer connection closed with %d", pollfd); |
2543 | } | |
2544 | } | |
03e43155 MD |
2545 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
2546 | cleanup_connection_pollfd(&events, pollfd); | |
2547 | /* Put "create" ownership reference. */ | |
2548 | connection_put(conn); | |
2549 | } else { | |
2550 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
2551 | connection_put(conn); | |
2552 | goto error; | |
d3e2ba59 | 2553 | } |
7591bab1 MD |
2554 | /* Put local "get_by_sock" reference. */ |
2555 | connection_put(conn); | |
d3e2ba59 JD |
2556 | } |
2557 | } | |
2558 | } | |
2559 | ||
2560 | exit: | |
2561 | error: | |
35bc1f58 | 2562 | (void) fd_tracker_util_poll_clean(the_fd_tracker, &events); |
d3e2ba59 | 2563 | |
71efa8ef | 2564 | /* Cleanup remaining connection object. */ |
d3e2ba59 | 2565 | rcu_read_lock(); |
7591bab1 | 2566 | cds_lfht_for_each_entry(viewer_connections_ht->ht, &iter.iter, |
302d8906 | 2567 | destroy_conn, |
58eb9381 | 2568 | sock_n.node) { |
eea7556c | 2569 | health_code_update(); |
7591bab1 | 2570 | connection_put(destroy_conn); |
d3e2ba59 JD |
2571 | } |
2572 | rcu_read_unlock(); | |
2573 | error_poll_create: | |
7591bab1 MD |
2574 | lttng_ht_destroy(viewer_connections_ht); |
2575 | viewer_connections_ht_error: | |
58eb9381 | 2576 | /* Close relay conn pipes */ |
87bcbe91 | 2577 | (void) fd_tracker_util_pipe_close(the_fd_tracker, live_conn_pipe); |
d3e2ba59 JD |
2578 | if (err) { |
2579 | DBG("Viewer worker thread exited with error"); | |
2580 | } | |
2581 | DBG("Viewer worker thread cleanup complete"); | |
9b5e0863 | 2582 | error_testpoint: |
eea7556c MD |
2583 | if (err) { |
2584 | health_error(); | |
2585 | ERR("Health error occurred in %s", __func__); | |
2586 | } | |
2587 | health_unregister(health_relayd); | |
b4aacfdc MD |
2588 | if (lttng_relay_stop_threads()) { |
2589 | ERR("Error stopping threads"); | |
178a0557 | 2590 | } |
d3e2ba59 JD |
2591 | rcu_unregister_thread(); |
2592 | return NULL; | |
2593 | } | |
2594 | ||
2595 | /* | |
2596 | * Create the relay command pipe to wake thread_manage_apps. | |
2597 | * Closed in cleanup(). | |
2598 | */ | |
58eb9381 | 2599 | static int create_conn_pipe(void) |
d3e2ba59 | 2600 | { |
87bcbe91 JG |
2601 | return fd_tracker_util_pipe_open_cloexec(the_fd_tracker, |
2602 | "Live connection pipe", live_conn_pipe); | |
178a0557 | 2603 | } |
d3e2ba59 | 2604 | |
178a0557 | 2605 | int relayd_live_join(void) |
d3e2ba59 | 2606 | { |
178a0557 | 2607 | int ret, retval = 0; |
d3e2ba59 JD |
2608 | void *status; |
2609 | ||
d3e2ba59 | 2610 | ret = pthread_join(live_listener_thread, &status); |
178a0557 MD |
2611 | if (ret) { |
2612 | errno = ret; | |
d3e2ba59 | 2613 | PERROR("pthread_join live listener"); |
178a0557 | 2614 | retval = -1; |
d3e2ba59 JD |
2615 | } |
2616 | ||
2617 | ret = pthread_join(live_worker_thread, &status); | |
178a0557 MD |
2618 | if (ret) { |
2619 | errno = ret; | |
d3e2ba59 | 2620 | PERROR("pthread_join live worker"); |
178a0557 | 2621 | retval = -1; |
d3e2ba59 JD |
2622 | } |
2623 | ||
2624 | ret = pthread_join(live_dispatcher_thread, &status); | |
178a0557 MD |
2625 | if (ret) { |
2626 | errno = ret; | |
d3e2ba59 | 2627 | PERROR("pthread_join live dispatcher"); |
178a0557 | 2628 | retval = -1; |
d3e2ba59 JD |
2629 | } |
2630 | ||
178a0557 | 2631 | cleanup_relayd_live(); |
d3e2ba59 | 2632 | |
178a0557 | 2633 | return retval; |
d3e2ba59 JD |
2634 | } |
2635 | ||
2636 | /* | |
2637 | * main | |
2638 | */ | |
7591bab1 | 2639 | int relayd_live_create(struct lttng_uri *uri) |
d3e2ba59 | 2640 | { |
178a0557 | 2641 | int ret = 0, retval = 0; |
d3e2ba59 JD |
2642 | void *status; |
2643 | int is_root; | |
2644 | ||
178a0557 MD |
2645 | if (!uri) { |
2646 | retval = -1; | |
2647 | goto exit_init_data; | |
2648 | } | |
d3e2ba59 JD |
2649 | live_uri = uri; |
2650 | ||
d3e2ba59 JD |
2651 | /* Check if daemon is UID = 0 */ |
2652 | is_root = !getuid(); | |
2653 | ||
2654 | if (!is_root) { | |
2655 | if (live_uri->port < 1024) { | |
2656 | ERR("Need to be root to use ports < 1024"); | |
178a0557 MD |
2657 | retval = -1; |
2658 | goto exit_init_data; | |
d3e2ba59 JD |
2659 | } |
2660 | } | |
2661 | ||
2662 | /* Setup the thread apps communication pipe. */ | |
178a0557 MD |
2663 | if (create_conn_pipe()) { |
2664 | retval = -1; | |
2665 | goto exit_init_data; | |
d3e2ba59 JD |
2666 | } |
2667 | ||
2668 | /* Init relay command queue. */ | |
8bdee6e2 | 2669 | cds_wfcq_init(&viewer_conn_queue.head, &viewer_conn_queue.tail); |
d3e2ba59 JD |
2670 | |
2671 | /* Set up max poll set size */ | |
25b397f9 MD |
2672 | if (lttng_poll_set_max_size()) { |
2673 | retval = -1; | |
2674 | goto exit_init_data; | |
2675 | } | |
d3e2ba59 JD |
2676 | |
2677 | /* Setup the dispatcher thread */ | |
1a1a34b4 | 2678 | ret = pthread_create(&live_dispatcher_thread, default_pthread_attr(), |
d3e2ba59 | 2679 | thread_dispatcher, (void *) NULL); |
178a0557 MD |
2680 | if (ret) { |
2681 | errno = ret; | |
d3e2ba59 | 2682 | PERROR("pthread_create viewer dispatcher"); |
178a0557 MD |
2683 | retval = -1; |
2684 | goto exit_dispatcher_thread; | |
d3e2ba59 JD |
2685 | } |
2686 | ||
2687 | /* Setup the worker thread */ | |
1a1a34b4 | 2688 | ret = pthread_create(&live_worker_thread, default_pthread_attr(), |
7591bab1 | 2689 | thread_worker, NULL); |
178a0557 MD |
2690 | if (ret) { |
2691 | errno = ret; | |
d3e2ba59 | 2692 | PERROR("pthread_create viewer worker"); |
178a0557 MD |
2693 | retval = -1; |
2694 | goto exit_worker_thread; | |
d3e2ba59 JD |
2695 | } |
2696 | ||
2697 | /* Setup the listener thread */ | |
1a1a34b4 | 2698 | ret = pthread_create(&live_listener_thread, default_pthread_attr(), |
d3e2ba59 | 2699 | thread_listener, (void *) NULL); |
178a0557 MD |
2700 | if (ret) { |
2701 | errno = ret; | |
d3e2ba59 | 2702 | PERROR("pthread_create viewer listener"); |
178a0557 MD |
2703 | retval = -1; |
2704 | goto exit_listener_thread; | |
d3e2ba59 JD |
2705 | } |
2706 | ||
178a0557 MD |
2707 | /* |
2708 | * All OK, started all threads. | |
2709 | */ | |
2710 | return retval; | |
2711 | ||
9911d21b JG |
2712 | /* |
2713 | * Join on the live_listener_thread should anything be added after | |
2714 | * the live_listener thread's creation. | |
2715 | */ | |
d3e2ba59 | 2716 | |
178a0557 | 2717 | exit_listener_thread: |
d3e2ba59 | 2718 | |
d3e2ba59 | 2719 | ret = pthread_join(live_worker_thread, &status); |
178a0557 MD |
2720 | if (ret) { |
2721 | errno = ret; | |
d3e2ba59 | 2722 | PERROR("pthread_join live worker"); |
178a0557 | 2723 | retval = -1; |
d3e2ba59 | 2724 | } |
178a0557 | 2725 | exit_worker_thread: |
d3e2ba59 | 2726 | |
d3e2ba59 | 2727 | ret = pthread_join(live_dispatcher_thread, &status); |
178a0557 MD |
2728 | if (ret) { |
2729 | errno = ret; | |
d3e2ba59 | 2730 | PERROR("pthread_join live dispatcher"); |
178a0557 | 2731 | retval = -1; |
d3e2ba59 | 2732 | } |
178a0557 | 2733 | exit_dispatcher_thread: |
d3e2ba59 | 2734 | |
178a0557 MD |
2735 | exit_init_data: |
2736 | cleanup_relayd_live(); | |
d3e2ba59 | 2737 | |
178a0557 | 2738 | return retval; |
d3e2ba59 | 2739 | } |