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 | |
9edaf114 JG |
284 | assert(relay_session); |
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 | |
7a962c33 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 | 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; | |
555 | struct lttcomm_sock *sock = data; | |
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 | { | |
570 | struct lttcomm_sock *sock = data; | |
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. */ | |
579 | struct lttcomm_sock **socks = data; | |
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. */ |
8bdee6e2 SM |
787 | cds_wfcq_enqueue(&viewer_conn_queue.head, &viewer_conn_queue.tail, |
788 | &new_conn->qnode); | |
d3e2ba59 JD |
789 | |
790 | /* | |
7591bab1 MD |
791 | * Wake the dispatch queue futex. |
792 | * Implicit memory barrier with the | |
793 | * exchange in cds_wfcq_enqueue. | |
d3e2ba59 | 794 | */ |
58eb9381 | 795 | futex_nto1_wake(&viewer_conn_queue.futex); |
03e43155 MD |
796 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
797 | ERR("socket poll error"); | |
798 | goto error; | |
799 | } else { | |
800 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
801 | goto error; | |
d3e2ba59 JD |
802 | } |
803 | } | |
804 | } | |
805 | ||
806 | exit: | |
807 | error: | |
808 | error_poll_add: | |
9b5e0863 | 809 | error_testpoint: |
23f940ff | 810 | (void) fd_tracker_util_poll_clean(the_fd_tracker, &events); |
d3e2ba59 JD |
811 | error_create_poll: |
812 | if (live_control_sock->fd >= 0) { | |
8855795d JG |
813 | int sock_fd = live_control_sock->fd; |
814 | ||
815 | ret = fd_tracker_close_unsuspendable_fd(the_fd_tracker, | |
816 | &sock_fd, 1, close_sock, | |
817 | live_control_sock); | |
d3e2ba59 JD |
818 | if (ret) { |
819 | PERROR("close"); | |
820 | } | |
8855795d | 821 | live_control_sock->fd = -1; |
d3e2ba59 JD |
822 | } |
823 | lttcomm_destroy_sock(live_control_sock); | |
824 | error_sock_control: | |
825 | if (err) { | |
eea7556c | 826 | health_error(); |
d3e2ba59 JD |
827 | DBG("Live viewer listener thread exited with error"); |
828 | } | |
eea7556c | 829 | health_unregister(health_relayd); |
8fba2b8d | 830 | rcu_unregister_thread(); |
d3e2ba59 | 831 | DBG("Live viewer listener thread cleanup complete"); |
b4aacfdc MD |
832 | if (lttng_relay_stop_threads()) { |
833 | ERR("Error stopping threads"); | |
178a0557 | 834 | } |
d3e2ba59 JD |
835 | return NULL; |
836 | } | |
837 | ||
838 | /* | |
839 | * This thread manages the dispatching of the requests to worker threads | |
840 | */ | |
841 | static | |
842 | void *thread_dispatcher(void *data) | |
843 | { | |
6cd525e8 MD |
844 | int err = -1; |
845 | ssize_t ret; | |
8bdee6e2 | 846 | struct cds_wfcq_node *node; |
58eb9381 | 847 | struct relay_connection *conn = NULL; |
d3e2ba59 JD |
848 | |
849 | DBG("[thread] Live viewer relay dispatcher started"); | |
850 | ||
eea7556c MD |
851 | health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_DISPATCHER); |
852 | ||
9b5e0863 MD |
853 | if (testpoint(relayd_thread_live_dispatcher)) { |
854 | goto error_testpoint; | |
855 | } | |
856 | ||
eea7556c MD |
857 | health_code_update(); |
858 | ||
0ed3b1a8 | 859 | for (;;) { |
eea7556c MD |
860 | health_code_update(); |
861 | ||
d3e2ba59 | 862 | /* Atomically prepare the queue futex */ |
58eb9381 | 863 | futex_nto1_prepare(&viewer_conn_queue.futex); |
d3e2ba59 | 864 | |
0ed3b1a8 MD |
865 | if (CMM_LOAD_SHARED(live_dispatch_thread_exit)) { |
866 | break; | |
867 | } | |
868 | ||
d3e2ba59 | 869 | do { |
eea7556c MD |
870 | health_code_update(); |
871 | ||
d3e2ba59 | 872 | /* Dequeue commands */ |
8bdee6e2 SM |
873 | node = cds_wfcq_dequeue_blocking(&viewer_conn_queue.head, |
874 | &viewer_conn_queue.tail); | |
d3e2ba59 JD |
875 | if (node == NULL) { |
876 | DBG("Woken up but nothing in the live-viewer " | |
877 | "relay command queue"); | |
878 | /* Continue thread execution */ | |
879 | break; | |
880 | } | |
58eb9381 | 881 | conn = caa_container_of(node, struct relay_connection, qnode); |
d3e2ba59 | 882 | DBG("Dispatching viewer request waiting on sock %d", |
58eb9381 | 883 | conn->sock->fd); |
d3e2ba59 JD |
884 | |
885 | /* | |
7591bab1 MD |
886 | * Inform worker thread of the new request. This |
887 | * call is blocking so we can be assured that | |
888 | * the data will be read at some point in time | |
889 | * or wait to the end of the world :) | |
d3e2ba59 | 890 | */ |
58eb9381 DG |
891 | ret = lttng_write(live_conn_pipe[1], &conn, sizeof(conn)); |
892 | if (ret < 0) { | |
893 | PERROR("write conn pipe"); | |
7591bab1 | 894 | connection_put(conn); |
d3e2ba59 JD |
895 | goto error; |
896 | } | |
897 | } while (node != NULL); | |
898 | ||
899 | /* Futex wait on queue. Blocking call on futex() */ | |
eea7556c | 900 | health_poll_entry(); |
58eb9381 | 901 | futex_nto1_wait(&viewer_conn_queue.futex); |
eea7556c | 902 | health_poll_exit(); |
d3e2ba59 JD |
903 | } |
904 | ||
eea7556c MD |
905 | /* Normal exit, no error */ |
906 | err = 0; | |
907 | ||
d3e2ba59 | 908 | error: |
9b5e0863 | 909 | error_testpoint: |
eea7556c MD |
910 | if (err) { |
911 | health_error(); | |
912 | ERR("Health error occurred in %s", __func__); | |
913 | } | |
914 | health_unregister(health_relayd); | |
d3e2ba59 | 915 | DBG("Live viewer dispatch thread dying"); |
b4aacfdc MD |
916 | if (lttng_relay_stop_threads()) { |
917 | ERR("Error stopping threads"); | |
178a0557 | 918 | } |
d3e2ba59 JD |
919 | return NULL; |
920 | } | |
921 | ||
922 | /* | |
923 | * Establish connection with the viewer and check the versions. | |
924 | * | |
925 | * Return 0 on success or else negative value. | |
926 | */ | |
927 | static | |
58eb9381 | 928 | int viewer_connect(struct relay_connection *conn) |
d3e2ba59 JD |
929 | { |
930 | int ret; | |
931 | struct lttng_viewer_connect reply, msg; | |
932 | ||
58eb9381 | 933 | conn->version_check_done = 1; |
d3e2ba59 | 934 | |
eea7556c MD |
935 | health_code_update(); |
936 | ||
2f8f53af DG |
937 | DBG("Viewer is establishing a connection to the relayd."); |
938 | ||
58eb9381 | 939 | ret = recv_request(conn->sock, &msg, sizeof(msg)); |
2f8f53af | 940 | if (ret < 0) { |
d3e2ba59 JD |
941 | goto end; |
942 | } | |
943 | ||
eea7556c MD |
944 | health_code_update(); |
945 | ||
f46b2ce6 | 946 | memset(&reply, 0, sizeof(reply)); |
d3e2ba59 JD |
947 | reply.major = RELAYD_VERSION_COMM_MAJOR; |
948 | reply.minor = RELAYD_VERSION_COMM_MINOR; | |
949 | ||
950 | /* Major versions must be the same */ | |
951 | if (reply.major != be32toh(msg.major)) { | |
2f8f53af DG |
952 | DBG("Incompatible major versions ([relayd] %u vs [client] %u)", |
953 | reply.major, be32toh(msg.major)); | |
72180669 | 954 | ret = -1; |
d3e2ba59 JD |
955 | goto end; |
956 | } | |
957 | ||
58eb9381 | 958 | conn->major = reply.major; |
d3e2ba59 JD |
959 | /* We adapt to the lowest compatible version */ |
960 | if (reply.minor <= be32toh(msg.minor)) { | |
58eb9381 | 961 | conn->minor = reply.minor; |
d3e2ba59 | 962 | } else { |
58eb9381 | 963 | conn->minor = be32toh(msg.minor); |
d3e2ba59 JD |
964 | } |
965 | ||
c4e361a4 | 966 | if (be32toh(msg.type) == LTTNG_VIEWER_CLIENT_COMMAND) { |
58eb9381 | 967 | conn->type = RELAY_VIEWER_COMMAND; |
c4e361a4 | 968 | } else if (be32toh(msg.type) == LTTNG_VIEWER_CLIENT_NOTIFICATION) { |
58eb9381 | 969 | conn->type = RELAY_VIEWER_NOTIFICATION; |
d3e2ba59 JD |
970 | } else { |
971 | ERR("Unknown connection type : %u", be32toh(msg.type)); | |
972 | ret = -1; | |
973 | goto end; | |
974 | } | |
975 | ||
976 | reply.major = htobe32(reply.major); | |
977 | reply.minor = htobe32(reply.minor); | |
58eb9381 | 978 | if (conn->type == RELAY_VIEWER_COMMAND) { |
93b4787b | 979 | /* |
7591bab1 MD |
980 | * Increment outside of htobe64 macro, because the argument can |
981 | * be used more than once within the macro, and thus the | |
982 | * operation may be undefined. | |
93b4787b | 983 | */ |
7591bab1 | 984 | pthread_mutex_lock(&last_relay_viewer_session_id_lock); |
93b4787b | 985 | last_relay_viewer_session_id++; |
7591bab1 | 986 | pthread_mutex_unlock(&last_relay_viewer_session_id_lock); |
93b4787b | 987 | reply.viewer_session_id = htobe64(last_relay_viewer_session_id); |
d3e2ba59 | 988 | } |
eea7556c MD |
989 | |
990 | health_code_update(); | |
991 | ||
58eb9381 | 992 | ret = send_response(conn->sock, &reply, sizeof(reply)); |
d3e2ba59 | 993 | if (ret < 0) { |
2f8f53af | 994 | goto end; |
d3e2ba59 JD |
995 | } |
996 | ||
eea7556c MD |
997 | health_code_update(); |
998 | ||
58eb9381 | 999 | DBG("Version check done using protocol %u.%u", conn->major, conn->minor); |
d3e2ba59 JD |
1000 | ret = 0; |
1001 | ||
1002 | end: | |
1003 | return ret; | |
1004 | } | |
1005 | ||
1006 | /* | |
1007 | * Send the viewer the list of current sessions. | |
7591bab1 MD |
1008 | * We need to create a copy of the hash table content because otherwise |
1009 | * we cannot assume the number of entries stays the same between getting | |
1010 | * the number of HT elements and iteration over the HT. | |
d3e2ba59 JD |
1011 | * |
1012 | * Return 0 on success or else a negative value. | |
1013 | */ | |
1014 | static | |
58eb9381 | 1015 | int viewer_list_sessions(struct relay_connection *conn) |
d3e2ba59 | 1016 | { |
5f10c6b1 | 1017 | int ret = 0; |
d3e2ba59 | 1018 | struct lttng_viewer_list_sessions session_list; |
d3e2ba59 | 1019 | struct lttng_ht_iter iter; |
d3e2ba59 | 1020 | struct relay_session *session; |
7591bab1 MD |
1021 | struct lttng_viewer_session *send_session_buf = NULL; |
1022 | uint32_t buf_count = SESSION_BUF_DEFAULT_COUNT; | |
1023 | uint32_t count = 0; | |
d3e2ba59 JD |
1024 | |
1025 | DBG("List sessions received"); | |
1026 | ||
7591bab1 MD |
1027 | send_session_buf = zmalloc(SESSION_BUF_DEFAULT_COUNT * sizeof(*send_session_buf)); |
1028 | if (!send_session_buf) { | |
1029 | return -1; | |
d3e2ba59 JD |
1030 | } |
1031 | ||
7591bab1 MD |
1032 | rcu_read_lock(); |
1033 | cds_lfht_for_each_entry(sessions_ht->ht, &iter.iter, session, | |
2f8f53af | 1034 | session_n.node) { |
7591bab1 | 1035 | struct lttng_viewer_session *send_session; |
d3e2ba59 | 1036 | |
eea7556c MD |
1037 | health_code_update(); |
1038 | ||
d995f382 | 1039 | pthread_mutex_lock(&session->lock); |
7e0a4379 JR |
1040 | if (session->connection_closed) { |
1041 | /* Skip closed session */ | |
d995f382 JG |
1042 | goto next_session; |
1043 | } | |
7e0a4379 | 1044 | |
7591bab1 MD |
1045 | if (count >= buf_count) { |
1046 | struct lttng_viewer_session *newbuf; | |
1047 | uint32_t new_buf_count = buf_count << 1; | |
eea7556c | 1048 | |
7591bab1 MD |
1049 | newbuf = realloc(send_session_buf, |
1050 | new_buf_count * sizeof(*send_session_buf)); | |
1051 | if (!newbuf) { | |
1052 | ret = -1; | |
d995f382 | 1053 | goto break_loop; |
7591bab1 MD |
1054 | } |
1055 | send_session_buf = newbuf; | |
1056 | buf_count = new_buf_count; | |
6763619c | 1057 | } |
7591bab1 | 1058 | send_session = &send_session_buf[count]; |
bfc3fb17 MD |
1059 | if (lttng_strncpy(send_session->session_name, |
1060 | session->session_name, | |
1061 | sizeof(send_session->session_name))) { | |
1062 | ret = -1; | |
d995f382 | 1063 | goto break_loop; |
bfc3fb17 MD |
1064 | } |
1065 | if (lttng_strncpy(send_session->hostname, session->hostname, | |
1066 | sizeof(send_session->hostname))) { | |
1067 | ret = -1; | |
d995f382 | 1068 | goto break_loop; |
bfc3fb17 | 1069 | } |
7591bab1 MD |
1070 | send_session->id = htobe64(session->id); |
1071 | send_session->live_timer = htobe32(session->live_timer); | |
1072 | if (session->viewer_attached) { | |
1073 | send_session->clients = htobe32(1); | |
1074 | } else { | |
1075 | send_session->clients = htobe32(0); | |
d227d5bd | 1076 | } |
7591bab1 MD |
1077 | send_session->streams = htobe32(session->stream_count); |
1078 | count++; | |
d995f382 JG |
1079 | next_session: |
1080 | pthread_mutex_unlock(&session->lock); | |
1081 | continue; | |
1082 | break_loop: | |
1083 | pthread_mutex_unlock(&session->lock); | |
1084 | break; | |
7591bab1 MD |
1085 | } |
1086 | rcu_read_unlock(); | |
5f10c6b1 JG |
1087 | if (ret < 0) { |
1088 | goto end_free; | |
1089 | } | |
d227d5bd | 1090 | |
7591bab1 | 1091 | session_list.sessions_count = htobe32(count); |
d227d5bd | 1092 | |
7591bab1 | 1093 | health_code_update(); |
d227d5bd | 1094 | |
7591bab1 MD |
1095 | ret = send_response(conn->sock, &session_list, sizeof(session_list)); |
1096 | if (ret < 0) { | |
1097 | goto end_free; | |
d227d5bd | 1098 | } |
d227d5bd | 1099 | |
7591bab1 | 1100 | health_code_update(); |
d227d5bd | 1101 | |
7591bab1 MD |
1102 | ret = send_response(conn->sock, send_session_buf, |
1103 | count * sizeof(*send_session_buf)); | |
1104 | if (ret < 0) { | |
1105 | goto end_free; | |
d227d5bd | 1106 | } |
7591bab1 | 1107 | health_code_update(); |
d227d5bd | 1108 | |
7591bab1 MD |
1109 | ret = 0; |
1110 | end_free: | |
1111 | free(send_session_buf); | |
1112 | return ret; | |
d227d5bd JD |
1113 | } |
1114 | ||
80e8027a | 1115 | /* |
7591bab1 | 1116 | * Send the viewer the list of current streams. |
80e8027a JD |
1117 | */ |
1118 | static | |
58eb9381 | 1119 | int viewer_get_new_streams(struct relay_connection *conn) |
80e8027a JD |
1120 | { |
1121 | int ret, send_streams = 0; | |
7591bab1 | 1122 | uint32_t nb_created = 0, nb_unsent = 0, nb_streams = 0, nb_total = 0; |
80e8027a JD |
1123 | struct lttng_viewer_new_streams_request request; |
1124 | struct lttng_viewer_new_streams_response response; | |
b66a15d1 | 1125 | struct relay_session *session = NULL; |
6763619c | 1126 | uint64_t session_id; |
bddf80e4 | 1127 | bool closed = false; |
80e8027a | 1128 | |
58eb9381 | 1129 | assert(conn); |
80e8027a JD |
1130 | |
1131 | DBG("Get new streams received"); | |
1132 | ||
80e8027a JD |
1133 | health_code_update(); |
1134 | ||
2f8f53af | 1135 | /* Receive the request from the connected client. */ |
58eb9381 | 1136 | ret = recv_request(conn->sock, &request, sizeof(request)); |
2f8f53af | 1137 | if (ret < 0) { |
80e8027a JD |
1138 | goto error; |
1139 | } | |
6763619c | 1140 | session_id = be64toh(request.session_id); |
80e8027a JD |
1141 | |
1142 | health_code_update(); | |
1143 | ||
53efb85a MD |
1144 | memset(&response, 0, sizeof(response)); |
1145 | ||
7591bab1 | 1146 | session = session_get_by_id(session_id); |
2f8f53af | 1147 | if (!session) { |
6763619c | 1148 | DBG("Relay session %" PRIu64 " not found", session_id); |
c4e361a4 | 1149 | response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_ERR); |
80e8027a JD |
1150 | goto send_reply; |
1151 | } | |
1152 | ||
7591bab1 | 1153 | if (!viewer_session_is_attached(conn->viewer_session, session)) { |
c4e361a4 | 1154 | response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_ERR); |
80e8027a JD |
1155 | goto send_reply; |
1156 | } | |
1157 | ||
36c20907 JR |
1158 | /* |
1159 | * For any new stream, create it with LTTNG_VIEWER_SEEK_BEGINNING since | |
1160 | * that at this point the client is already attached to the session.Aany | |
1161 | * initial stream will have been created with the seek type at attach | |
1162 | * time (for now most readers use the LTTNG_VIEWER_SEEK_LAST on attach). | |
1163 | * Otherwise any event happening in a new stream between the attach and | |
1164 | * a call to viewer_get_new_streams will be "lost" (never received) from | |
1165 | * the viewer's point of view. | |
1166 | */ | |
c06fdd95 | 1167 | pthread_mutex_lock(&session->lock); |
8433d916 MD |
1168 | /* |
1169 | * If a session rotation is ongoing, do not attempt to open any | |
1170 | * stream, because the chunk can be in an intermediate state | |
1171 | * due to directory renaming. | |
1172 | */ | |
1173 | if (session->ongoing_rotation) { | |
1174 | DBG("Relay session %" PRIu64 " rotation ongoing", session_id); | |
1175 | response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_NO_NEW); | |
1176 | goto send_reply_unlock; | |
1177 | } | |
b66a15d1 | 1178 | ret = make_viewer_streams(session, |
9edaf114 | 1179 | conn->viewer_session, |
36c20907 | 1180 | LTTNG_VIEWER_SEEK_BEGINNING, &nb_total, &nb_unsent, |
bddf80e4 | 1181 | &nb_created, &closed); |
2f8f53af | 1182 | if (ret < 0) { |
b66a15d1 | 1183 | goto error_unlock_session; |
2f8f53af | 1184 | } |
3d0bbd40 JG |
1185 | send_streams = 1; |
1186 | response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_OK); | |
b66a15d1 | 1187 | |
2f8f53af DG |
1188 | /* Only send back the newly created streams with the unsent ones. */ |
1189 | nb_streams = nb_created + nb_unsent; | |
80e8027a JD |
1190 | response.streams_count = htobe32(nb_streams); |
1191 | ||
4479f682 | 1192 | /* |
2229a09c MD |
1193 | * If the session is closed, HUP when there are no more streams |
1194 | * with data. | |
4479f682 | 1195 | */ |
bddf80e4 | 1196 | if (closed && nb_total == 0) { |
4479f682 | 1197 | send_streams = 0; |
bddf80e4 | 1198 | response.streams_count = 0; |
4479f682 | 1199 | response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_HUP); |
3d0bbd40 | 1200 | goto send_reply_unlock; |
4479f682 | 1201 | } |
3d0bbd40 JG |
1202 | send_reply_unlock: |
1203 | pthread_mutex_unlock(&session->lock); | |
4479f682 | 1204 | |
80e8027a JD |
1205 | send_reply: |
1206 | health_code_update(); | |
58eb9381 | 1207 | ret = send_response(conn->sock, &response, sizeof(response)); |
80e8027a | 1208 | if (ret < 0) { |
7591bab1 | 1209 | goto end_put_session; |
80e8027a JD |
1210 | } |
1211 | health_code_update(); | |
1212 | ||
1213 | /* | |
7591bab1 MD |
1214 | * Unknown or empty session, just return gracefully, the viewer |
1215 | * knows what is happening. | |
80e8027a JD |
1216 | */ |
1217 | if (!send_streams || !nb_streams) { | |
1218 | ret = 0; | |
7591bab1 | 1219 | goto end_put_session; |
80e8027a JD |
1220 | } |
1221 | ||
2f8f53af | 1222 | /* |
7591bab1 MD |
1223 | * Send stream and *DON'T* ignore the sent flag so every viewer |
1224 | * streams that were not sent from that point will be sent to | |
1225 | * the viewer. | |
2f8f53af | 1226 | */ |
c06fdd95 | 1227 | ret = send_viewer_streams(conn->sock, session_id, 0); |
2f8f53af | 1228 | if (ret < 0) { |
7591bab1 | 1229 | goto end_put_session; |
80e8027a JD |
1230 | } |
1231 | ||
7591bab1 MD |
1232 | end_put_session: |
1233 | if (session) { | |
1234 | session_put(session); | |
1235 | } | |
80e8027a JD |
1236 | error: |
1237 | return ret; | |
b66a15d1 JG |
1238 | error_unlock_session: |
1239 | pthread_mutex_unlock(&session->lock); | |
1240 | session_put(session); | |
1241 | return ret; | |
80e8027a JD |
1242 | } |
1243 | ||
d3e2ba59 JD |
1244 | /* |
1245 | * Send the viewer the list of current sessions. | |
1246 | */ | |
1247 | static | |
58eb9381 | 1248 | int viewer_attach_session(struct relay_connection *conn) |
d3e2ba59 | 1249 | { |
2f8f53af DG |
1250 | int send_streams = 0; |
1251 | ssize_t ret; | |
80e8027a | 1252 | uint32_t nb_streams = 0; |
2f8f53af | 1253 | enum lttng_viewer_seek seek_type; |
d3e2ba59 JD |
1254 | struct lttng_viewer_attach_session_request request; |
1255 | struct lttng_viewer_attach_session_response response; | |
7591bab1 | 1256 | struct relay_session *session = NULL; |
dbd6665b | 1257 | enum lttng_viewer_attach_return_code viewer_attach_status; |
bddf80e4 | 1258 | bool closed = false; |
c06fdd95 | 1259 | uint64_t session_id; |
d3e2ba59 | 1260 | |
58eb9381 | 1261 | assert(conn); |
d3e2ba59 | 1262 | |
eea7556c MD |
1263 | health_code_update(); |
1264 | ||
2f8f53af | 1265 | /* Receive the request from the connected client. */ |
58eb9381 | 1266 | ret = recv_request(conn->sock, &request, sizeof(request)); |
2f8f53af | 1267 | if (ret < 0) { |
d3e2ba59 JD |
1268 | goto error; |
1269 | } | |
1270 | ||
c06fdd95 | 1271 | session_id = be64toh(request.session_id); |
eea7556c MD |
1272 | health_code_update(); |
1273 | ||
53efb85a MD |
1274 | memset(&response, 0, sizeof(response)); |
1275 | ||
c3b7390b JD |
1276 | if (!conn->viewer_session) { |
1277 | DBG("Client trying to attach before creating a live viewer session"); | |
1278 | response.status = htobe32(LTTNG_VIEWER_ATTACH_NO_SESSION); | |
1279 | goto send_reply; | |
1280 | } | |
1281 | ||
c06fdd95 | 1282 | session = session_get_by_id(session_id); |
2f8f53af | 1283 | if (!session) { |
c06fdd95 | 1284 | DBG("Relay session %" PRIu64 " not found", session_id); |
c4e361a4 | 1285 | response.status = htobe32(LTTNG_VIEWER_ATTACH_UNK); |
d3e2ba59 JD |
1286 | goto send_reply; |
1287 | } | |
c06fdd95 | 1288 | DBG("Attach session ID %" PRIu64 " received", session_id); |
d3e2ba59 | 1289 | |
c06fdd95 | 1290 | pthread_mutex_lock(&session->lock); |
7591bab1 | 1291 | if (session->live_timer == 0) { |
d3e2ba59 | 1292 | DBG("Not live session"); |
c4e361a4 | 1293 | response.status = htobe32(LTTNG_VIEWER_ATTACH_NOT_LIVE); |
d3e2ba59 | 1294 | goto send_reply; |
7591bab1 MD |
1295 | } |
1296 | ||
1297 | send_streams = 1; | |
dbd6665b JG |
1298 | viewer_attach_status = viewer_session_attach(conn->viewer_session, |
1299 | session); | |
1300 | if (viewer_attach_status != LTTNG_VIEWER_ATTACH_OK) { | |
1301 | response.status = htobe32(viewer_attach_status); | |
7591bab1 | 1302 | goto send_reply; |
d3e2ba59 JD |
1303 | } |
1304 | ||
1305 | switch (be32toh(request.seek)) { | |
c4e361a4 JD |
1306 | case LTTNG_VIEWER_SEEK_BEGINNING: |
1307 | case LTTNG_VIEWER_SEEK_LAST: | |
7591bab1 | 1308 | response.status = htobe32(LTTNG_VIEWER_ATTACH_OK); |
2f8f53af | 1309 | seek_type = be32toh(request.seek); |
d3e2ba59 JD |
1310 | break; |
1311 | default: | |
1312 | ERR("Wrong seek parameter"); | |
c4e361a4 | 1313 | response.status = htobe32(LTTNG_VIEWER_ATTACH_SEEK_ERR); |
d3e2ba59 JD |
1314 | send_streams = 0; |
1315 | goto send_reply; | |
1316 | } | |
1317 | ||
8433d916 MD |
1318 | /* |
1319 | * If a session rotation is ongoing, do not attempt to open any | |
1320 | * stream, because the chunk can be in an intermediate state | |
1321 | * due to directory renaming. | |
1322 | */ | |
1323 | if (session->ongoing_rotation) { | |
1324 | DBG("Relay session %" PRIu64 " rotation ongoing", session_id); | |
1325 | send_streams = 0; | |
1326 | goto send_reply; | |
1327 | } | |
1328 | ||
b66a15d1 | 1329 | ret = make_viewer_streams(session, |
9edaf114 | 1330 | conn->viewer_session, seek_type, |
b66a15d1 | 1331 | &nb_streams, NULL, NULL, &closed); |
2f8f53af | 1332 | if (ret < 0) { |
7591bab1 | 1333 | goto end_put_session; |
d3e2ba59 | 1334 | } |
c06fdd95 JG |
1335 | pthread_mutex_unlock(&session->lock); |
1336 | session_put(session); | |
1337 | session = NULL; | |
1338 | ||
1339 | response.streams_count = htobe32(nb_streams); | |
bddf80e4 MD |
1340 | /* |
1341 | * If the session is closed when the viewer is attaching, it | |
1342 | * means some of the streams may have been concurrently removed, | |
1343 | * so we don't allow the viewer to attach, even if there are | |
1344 | * streams available. | |
1345 | */ | |
1346 | if (closed) { | |
1347 | send_streams = 0; | |
1348 | response.streams_count = 0; | |
06079f15 | 1349 | response.status = htobe32(LTTNG_VIEWER_ATTACH_UNK); |
bddf80e4 MD |
1350 | goto send_reply; |
1351 | } | |
1352 | ||
d3e2ba59 | 1353 | send_reply: |
eea7556c | 1354 | health_code_update(); |
58eb9381 | 1355 | ret = send_response(conn->sock, &response, sizeof(response)); |
d3e2ba59 | 1356 | if (ret < 0) { |
7591bab1 | 1357 | goto end_put_session; |
d3e2ba59 | 1358 | } |
eea7556c | 1359 | health_code_update(); |
d3e2ba59 JD |
1360 | |
1361 | /* | |
7591bab1 MD |
1362 | * Unknown or empty session, just return gracefully, the viewer |
1363 | * knows what is happening. | |
d3e2ba59 | 1364 | */ |
157df586 | 1365 | if (!send_streams || !nb_streams) { |
d3e2ba59 | 1366 | ret = 0; |
7591bab1 | 1367 | goto end_put_session; |
d3e2ba59 JD |
1368 | } |
1369 | ||
2f8f53af | 1370 | /* Send stream and ignore the sent flag. */ |
c06fdd95 | 1371 | ret = send_viewer_streams(conn->sock, session_id, 1); |
2f8f53af | 1372 | if (ret < 0) { |
7591bab1 | 1373 | goto end_put_session; |
d3e2ba59 | 1374 | } |
d3e2ba59 | 1375 | |
7591bab1 MD |
1376 | end_put_session: |
1377 | if (session) { | |
c06fdd95 | 1378 | pthread_mutex_unlock(&session->lock); |
7591bab1 MD |
1379 | session_put(session); |
1380 | } | |
4a9daf17 JD |
1381 | error: |
1382 | return ret; | |
1383 | } | |
1384 | ||
878c34cf DG |
1385 | /* |
1386 | * Open the index file if needed for the given vstream. | |
1387 | * | |
f8f3885c MD |
1388 | * If an index file is successfully opened, the vstream will set it as its |
1389 | * current index file. | |
878c34cf DG |
1390 | * |
1391 | * Return 0 on success, a negative value on error (-ENOENT if not ready yet). | |
7591bab1 MD |
1392 | * |
1393 | * Called with rstream lock held. | |
878c34cf DG |
1394 | */ |
1395 | static int try_open_index(struct relay_viewer_stream *vstream, | |
1396 | struct relay_stream *rstream) | |
1397 | { | |
1398 | int ret = 0; | |
ebb29c10 JG |
1399 | const uint32_t connection_major = rstream->trace->session->major; |
1400 | const uint32_t connection_minor = rstream->trace->session->minor; | |
3ff5c5db | 1401 | enum lttng_trace_chunk_status chunk_status; |
878c34cf | 1402 | |
f8f3885c | 1403 | if (vstream->index_file) { |
878c34cf DG |
1404 | goto end; |
1405 | } | |
1406 | ||
1407 | /* | |
7591bab1 | 1408 | * First time, we open the index file and at least one index is ready. |
878c34cf | 1409 | */ |
80516611 JG |
1410 | if (rstream->index_received_seqcount == 0 || |
1411 | !vstream->stream_file.trace_chunk) { | |
878c34cf DG |
1412 | ret = -ENOENT; |
1413 | goto end; | |
1414 | } | |
80516611 | 1415 | |
3ff5c5db | 1416 | chunk_status = lttng_index_file_create_from_trace_chunk_read_only( |
b66a15d1 | 1417 | vstream->stream_file.trace_chunk, rstream->path_name, |
ebb29c10 JG |
1418 | rstream->channel_name, rstream->tracefile_size, |
1419 | vstream->current_tracefile_id, | |
1420 | lttng_to_index_major(connection_major, connection_minor), | |
3ff5c5db MD |
1421 | lttng_to_index_minor(connection_major, connection_minor), |
1422 | true, &vstream->index_file); | |
1423 | if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { | |
1424 | if (chunk_status == LTTNG_TRACE_CHUNK_STATUS_NO_FILE) { | |
1425 | ret = -ENOENT; | |
1426 | } else { | |
1427 | ret = -1; | |
1428 | } | |
878c34cf DG |
1429 | } |
1430 | ||
1431 | end: | |
1432 | return ret; | |
1433 | } | |
1434 | ||
1435 | /* | |
7591bab1 MD |
1436 | * Check the status of the index for the given stream. This function |
1437 | * updates the index structure if needed and can put (close) the vstream | |
1438 | * in the HUP situation. | |
1439 | * | |
1440 | * Return 0 means that we can proceed with the index. A value of 1 means | |
1441 | * that the index has been updated and is ready to be sent to the | |
1442 | * client. A negative value indicates an error that can't be handled. | |
878c34cf | 1443 | * |
7591bab1 | 1444 | * Called with rstream lock held. |
878c34cf DG |
1445 | */ |
1446 | static int check_index_status(struct relay_viewer_stream *vstream, | |
1447 | struct relay_stream *rstream, struct ctf_trace *trace, | |
1448 | struct lttng_viewer_index *index) | |
1449 | { | |
1450 | int ret; | |
1451 | ||
68c40154 MD |
1452 | DBG("Check index status: index_received_seqcount %" PRIu64 " " |
1453 | "index_sent_seqcount %" PRIu64 " " | |
1454 | "for stream %" PRIu64, | |
1455 | rstream->index_received_seqcount, | |
1456 | vstream->index_sent_seqcount, | |
1457 | vstream->stream->stream_handle); | |
797bc362 | 1458 | if ((trace->session->connection_closed || rstream->closed) |
a44ca2ca MD |
1459 | && rstream->index_received_seqcount |
1460 | == vstream->index_sent_seqcount) { | |
797bc362 MD |
1461 | /* |
1462 | * Last index sent and session connection or relay | |
1463 | * stream are closed. | |
1464 | */ | |
7591bab1 MD |
1465 | index->status = htobe32(LTTNG_VIEWER_INDEX_HUP); |
1466 | goto hup; | |
1467 | } else if (rstream->beacon_ts_end != -1ULL && | |
b0d240a2 MD |
1468 | (rstream->index_received_seqcount == 0 || |
1469 | (vstream->index_sent_seqcount != 0 && | |
a44ca2ca | 1470 | rstream->index_received_seqcount |
b0d240a2 | 1471 | <= vstream->index_sent_seqcount))) { |
7591bab1 MD |
1472 | /* |
1473 | * We've received a synchronization beacon and the last index | |
1474 | * available has been sent, the index for now is inactive. | |
1475 | * | |
1476 | * In this case, we have received a beacon which allows us to | |
1477 | * inform the client of a time interval during which we can | |
1478 | * guarantee that there are no events to read (and never will | |
1479 | * be). | |
b0d240a2 MD |
1480 | * |
1481 | * The sent seqcount can grow higher than receive seqcount on | |
1482 | * clear because the rotation performed by clear will push | |
1483 | * the index_sent_seqcount ahead (see | |
1484 | * viewer_stream_sync_tracefile_array_tail) and skip over | |
1485 | * packet sequence numbers. | |
7591bab1 MD |
1486 | */ |
1487 | index->status = htobe32(LTTNG_VIEWER_INDEX_INACTIVE); | |
1488 | index->timestamp_end = htobe64(rstream->beacon_ts_end); | |
1489 | index->stream_id = htobe64(rstream->ctf_stream_id); | |
68c40154 MD |
1490 | DBG("Check index status: inactive with beacon, for stream %" PRIu64, |
1491 | vstream->stream->stream_handle); | |
7591bab1 | 1492 | goto index_ready; |
b0d240a2 MD |
1493 | } else if (rstream->index_received_seqcount == 0 || |
1494 | (vstream->index_sent_seqcount != 0 && | |
1495 | rstream->index_received_seqcount | |
1496 | <= vstream->index_sent_seqcount)) { | |
7591bab1 | 1497 | /* |
b0d240a2 | 1498 | * This checks whether received <= sent seqcount. In |
a44ca2ca MD |
1499 | * this case, we have not received a beacon. Therefore, |
1500 | * we can only ask the client to retry later. | |
b0d240a2 MD |
1501 | * |
1502 | * The sent seqcount can grow higher than receive seqcount on | |
1503 | * clear because the rotation performed by clear will push | |
1504 | * the index_sent_seqcount ahead (see | |
1505 | * viewer_stream_sync_tracefile_array_tail) and skip over | |
1506 | * packet sequence numbers. | |
7591bab1 MD |
1507 | */ |
1508 | index->status = htobe32(LTTNG_VIEWER_INDEX_RETRY); | |
68c40154 MD |
1509 | DBG("Check index status: retry for stream %" PRIu64, |
1510 | vstream->stream->stream_handle); | |
7591bab1 | 1511 | goto index_ready; |
a44ca2ca MD |
1512 | } else if (!tracefile_array_seq_in_file(rstream->tfa, |
1513 | vstream->current_tracefile_id, | |
1514 | vstream->index_sent_seqcount)) { | |
7591bab1 | 1515 | /* |
a44ca2ca MD |
1516 | * The next index we want to send cannot be read either |
1517 | * because we need to perform a rotation, or due to | |
1518 | * the producer having overwritten its trace file. | |
7591bab1 | 1519 | */ |
a44ca2ca | 1520 | DBG("Viewer stream %" PRIu64 " rotation", |
7591bab1 MD |
1521 | vstream->stream->stream_handle); |
1522 | ret = viewer_stream_rotate(vstream); | |
b0d240a2 | 1523 | if (ret == 1) { |
7591bab1 MD |
1524 | /* EOF across entire stream. */ |
1525 | index->status = htobe32(LTTNG_VIEWER_INDEX_HUP); | |
1526 | goto hup; | |
1527 | } | |
7591bab1 | 1528 | /* |
a44ca2ca MD |
1529 | * If we have been pushed due to overwrite, it |
1530 | * necessarily means there is data that can be read in | |
1531 | * the stream. If we rotated because we reached the end | |
1532 | * of a tracefile, it means the following tracefile | |
1533 | * needs to contain at least one index, else we would | |
1534 | * have already returned LTTNG_VIEWER_INDEX_RETRY to the | |
1535 | * viewer. The updated index_sent_seqcount needs to | |
1536 | * point to a readable index entry now. | |
1537 | * | |
1538 | * In the case where we "rotate" on a single file, we | |
1539 | * can end up in a case where the requested index is | |
1540 | * still unavailable. | |
7591bab1 | 1541 | */ |
a44ca2ca MD |
1542 | if (rstream->tracefile_count == 1 && |
1543 | !tracefile_array_seq_in_file( | |
1544 | rstream->tfa, | |
1545 | vstream->current_tracefile_id, | |
1546 | vstream->index_sent_seqcount)) { | |
1547 | index->status = htobe32(LTTNG_VIEWER_INDEX_RETRY); | |
68c40154 MD |
1548 | DBG("Check index status: retry: " |
1549 | "tracefile array sequence number %" PRIu64 | |
1550 | " not in file for stream %" PRIu64, | |
1551 | vstream->index_sent_seqcount, | |
1552 | vstream->stream->stream_handle); | |
a44ca2ca | 1553 | goto index_ready; |
878c34cf | 1554 | } |
a44ca2ca MD |
1555 | assert(tracefile_array_seq_in_file(rstream->tfa, |
1556 | vstream->current_tracefile_id, | |
1557 | vstream->index_sent_seqcount)); | |
878c34cf | 1558 | } |
a44ca2ca MD |
1559 | /* ret == 0 means successful so we continue. */ |
1560 | ret = 0; | |
878c34cf DG |
1561 | return ret; |
1562 | ||
1563 | hup: | |
7591bab1 | 1564 | viewer_stream_put(vstream); |
878c34cf DG |
1565 | index_ready: |
1566 | return 1; | |
1567 | } | |
1568 | ||
80516611 JG |
1569 | static |
1570 | void viewer_stream_rotate_to_trace_chunk(struct relay_viewer_stream *vstream, | |
1571 | struct lttng_trace_chunk *new_trace_chunk) | |
1572 | { | |
1573 | lttng_trace_chunk_put(vstream->stream_file.trace_chunk); | |
1574 | ||
1575 | if (new_trace_chunk) { | |
1576 | const bool acquired_reference = lttng_trace_chunk_get( | |
1577 | new_trace_chunk); | |
1578 | ||
1579 | assert(acquired_reference); | |
1580 | } | |
1581 | ||
1582 | vstream->stream_file.trace_chunk = new_trace_chunk; | |
1583 | viewer_stream_sync_tracefile_array_tail(vstream); | |
1584 | viewer_stream_close_files(vstream); | |
1585 | } | |
1586 | ||
d3e2ba59 JD |
1587 | /* |
1588 | * Send the next index for a stream. | |
1589 | * | |
1590 | * Return 0 on success or else a negative value. | |
1591 | */ | |
1592 | static | |
58eb9381 | 1593 | int viewer_get_next_index(struct relay_connection *conn) |
d3e2ba59 JD |
1594 | { |
1595 | int ret; | |
1596 | struct lttng_viewer_get_next_index request_index; | |
1597 | struct lttng_viewer_index viewer_index; | |
50adc264 | 1598 | struct ctf_packet_index packet_index; |
7591bab1 MD |
1599 | struct relay_viewer_stream *vstream = NULL; |
1600 | struct relay_stream *rstream = NULL; | |
1601 | struct ctf_trace *ctf_trace = NULL; | |
1602 | struct relay_viewer_stream *metadata_viewer_stream = NULL; | |
d3e2ba59 | 1603 | |
58eb9381 | 1604 | assert(conn); |
d3e2ba59 JD |
1605 | |
1606 | DBG("Viewer get next index"); | |
1607 | ||
7591bab1 | 1608 | memset(&viewer_index, 0, sizeof(viewer_index)); |
eea7556c | 1609 | health_code_update(); |
2f8f53af | 1610 | |
58eb9381 | 1611 | ret = recv_request(conn->sock, &request_index, sizeof(request_index)); |
2f8f53af | 1612 | if (ret < 0) { |
d3e2ba59 JD |
1613 | goto end; |
1614 | } | |
eea7556c | 1615 | health_code_update(); |
d3e2ba59 | 1616 | |
7591bab1 | 1617 | vstream = viewer_stream_get_by_id(be64toh(request_index.stream_id)); |
6763619c | 1618 | if (!vstream) { |
a44ca2ca | 1619 | DBG("Client requested index of unknown stream id %" PRIu64, |
9b9f9f94 | 1620 | (uint64_t) be64toh(request_index.stream_id)); |
f1883937 MD |
1621 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR); |
1622 | goto send_reply; | |
2a174661 DG |
1623 | } |
1624 | ||
7591bab1 MD |
1625 | /* Use back. ref. Protected by refcounts. */ |
1626 | rstream = vstream->stream; | |
1627 | ctf_trace = rstream->trace; | |
d3e2ba59 | 1628 | |
7591bab1 MD |
1629 | /* metadata_viewer_stream may be NULL. */ |
1630 | metadata_viewer_stream = | |
1631 | ctf_trace_get_viewer_metadata_stream(ctf_trace); | |
2a174661 | 1632 | |
7591bab1 | 1633 | pthread_mutex_lock(&rstream->lock); |
d3e2ba59 JD |
1634 | |
1635 | /* | |
1636 | * The viewer should not ask for index on metadata stream. | |
1637 | */ | |
7591bab1 | 1638 | if (rstream->is_metadata) { |
c4e361a4 | 1639 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_HUP); |
d3e2ba59 JD |
1640 | goto send_reply; |
1641 | } | |
1642 | ||
b0d240a2 MD |
1643 | if (rstream->ongoing_rotation.is_set) { |
1644 | /* Rotation is ongoing, try again later. */ | |
1645 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_RETRY); | |
1646 | goto send_reply; | |
1647 | } | |
1648 | ||
1649 | if (rstream->trace->session->ongoing_rotation) { | |
1650 | /* Rotation is ongoing, try again later. */ | |
1651 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_RETRY); | |
1652 | goto send_reply; | |
1653 | } | |
1654 | ||
80516611 JG |
1655 | /* |
1656 | * Transition the viewer session into the newest trace chunk available. | |
1657 | */ | |
1658 | if (!lttng_trace_chunk_ids_equal( | |
ad8bec24 JG |
1659 | conn->viewer_session->current_trace_chunk, |
1660 | rstream->trace_chunk)) { | |
9a9c8637 | 1661 | DBG("Relay stream and viewer chunk ids differ"); |
b0d240a2 | 1662 | |
ad8bec24 JG |
1663 | ret = viewer_session_set_trace_chunk_copy( |
1664 | conn->viewer_session, | |
1665 | rstream->trace_chunk); | |
1666 | if (ret) { | |
b0d240a2 MD |
1667 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR); |
1668 | goto send_reply; | |
1669 | } | |
b0d240a2 | 1670 | } |
b0d240a2 | 1671 | |
80516611 JG |
1672 | /* |
1673 | * Transition the viewer stream into the latest trace chunk available. | |
1674 | * | |
1675 | * Note that the stream must _not_ rotate in one precise condition: | |
1676 | * the relay stream has rotated to a NULL trace chunk and the viewer | |
1677 | * stream is consuming the trace chunk that was active just before | |
1678 | * that rotation to NULL. | |
1679 | * | |
1680 | * This allows clients to consume all the packets of a trace chunk | |
1681 | * after a session's destruction. | |
1682 | */ | |
17cb7bac | 1683 | if (!lttng_trace_chunk_ids_equal(conn->viewer_session->current_trace_chunk, vstream->stream_file.trace_chunk) && |
80516611 | 1684 | !(rstream->completed_rotation_count == vstream->last_seen_rotation_count + 1 && !rstream->trace_chunk)) { |
17cb7bac | 1685 | DBG("Viewer session and viewer stream chunk IDs differ: " |
b0d240a2 MD |
1686 | "vsession chunk %p vstream chunk %p", |
1687 | conn->viewer_session->current_trace_chunk, | |
1688 | vstream->stream_file.trace_chunk); | |
80516611 JG |
1689 | viewer_stream_rotate_to_trace_chunk(vstream, |
1690 | conn->viewer_session->current_trace_chunk); | |
1691 | vstream->last_seen_rotation_count = | |
1692 | rstream->completed_rotation_count; | |
d3e2ba59 JD |
1693 | } |
1694 | ||
878c34cf | 1695 | ret = check_index_status(vstream, rstream, ctf_trace, &viewer_index); |
878c34cf | 1696 | if (ret < 0) { |
7591bab1 | 1697 | goto error_put; |
878c34cf DG |
1698 | } else if (ret == 1) { |
1699 | /* | |
7591bab1 MD |
1700 | * We have no index to send and check_index_status has populated |
1701 | * viewer_index's status. | |
878c34cf | 1702 | */ |
d3e2ba59 JD |
1703 | goto send_reply; |
1704 | } | |
7591bab1 | 1705 | /* At this point, ret is 0 thus we will be able to read the index. */ |
878c34cf | 1706 | assert(!ret); |
d3e2ba59 | 1707 | |
b0d240a2 MD |
1708 | /* Try to open an index if one is needed for that stream. */ |
1709 | ret = try_open_index(vstream, rstream); | |
1710 | if (ret == -ENOENT) { | |
1711 | if (rstream->closed) { | |
1712 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_HUP); | |
1713 | goto send_reply; | |
1714 | } else { | |
1715 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_RETRY); | |
1716 | goto send_reply; | |
1717 | } | |
1718 | } | |
1719 | if (ret < 0) { | |
1720 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR); | |
1721 | goto send_reply; | |
1722 | } | |
1723 | ||
7591bab1 MD |
1724 | /* |
1725 | * vstream->stream_fd may be NULL if it has been closed by | |
1726 | * tracefile rotation, or if we are at the beginning of the | |
1727 | * stream. We open the data stream file here to protect against | |
1728 | * overwrite caused by tracefile rotation (in association with | |
1729 | * unlink performed before overwrite). | |
1730 | */ | |
8bb66c3c | 1731 | if (!vstream->stream_file.handle) { |
ebb29c10 JG |
1732 | char file_path[LTTNG_PATH_MAX]; |
1733 | enum lttng_trace_chunk_status status; | |
8bb66c3c | 1734 | struct fs_handle *fs_handle; |
ebb29c10 JG |
1735 | |
1736 | ret = utils_stream_file_path(rstream->path_name, | |
1737 | rstream->channel_name, rstream->tracefile_size, | |
1738 | vstream->current_tracefile_id, NULL, file_path, | |
1739 | sizeof(file_path)); | |
7591bab1 MD |
1740 | if (ret < 0) { |
1741 | goto error_put; | |
1742 | } | |
ebb29c10 | 1743 | |
3ff5c5db MD |
1744 | /* |
1745 | * It is possible the the file we are trying to open is | |
1746 | * missing if the stream has been closed (application exits with | |
1747 | * per-pid buffers) and a clear command has been performed. | |
1748 | */ | |
8bb66c3c | 1749 | status = lttng_trace_chunk_open_fs_handle( |
ebb29c10 | 1750 | vstream->stream_file.trace_chunk, |
8bb66c3c | 1751 | file_path, O_RDONLY, 0, &fs_handle, true); |
ebb29c10 | 1752 | if (status != LTTNG_TRACE_CHUNK_STATUS_OK) { |
b0d240a2 MD |
1753 | if (status == LTTNG_TRACE_CHUNK_STATUS_NO_FILE && |
1754 | rstream->closed) { | |
1755 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_HUP); | |
1756 | goto send_reply; | |
1757 | } | |
ebb29c10 | 1758 | PERROR("Failed to open trace file for viewer stream"); |
7591bab1 MD |
1759 | goto error_put; |
1760 | } | |
8bb66c3c | 1761 | vstream->stream_file.handle = fs_handle; |
d3e2ba59 JD |
1762 | } |
1763 | ||
f04a971b | 1764 | ret = check_new_streams(conn); |
4a9daf17 | 1765 | if (ret < 0) { |
7591bab1 MD |
1766 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR); |
1767 | goto send_reply; | |
4a9daf17 JD |
1768 | } else if (ret == 1) { |
1769 | viewer_index.flags |= LTTNG_VIEWER_FLAG_NEW_STREAM; | |
1770 | } | |
1771 | ||
f8f3885c MD |
1772 | ret = lttng_index_file_read(vstream->index_file, &packet_index); |
1773 | if (ret) { | |
8bb66c3c | 1774 | ERR("Relay error reading index file"); |
7591bab1 | 1775 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR); |
6b6b9a5a | 1776 | goto send_reply; |
d3e2ba59 | 1777 | } else { |
c4e361a4 | 1778 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_OK); |
a44ca2ca | 1779 | vstream->index_sent_seqcount++; |
d3e2ba59 JD |
1780 | } |
1781 | ||
1782 | /* | |
1783 | * Indexes are stored in big endian, no need to switch before sending. | |
1784 | */ | |
7591bab1 MD |
1785 | DBG("Sending viewer index for stream %" PRIu64 " offset %" PRIu64, |
1786 | rstream->stream_handle, | |
9b9f9f94 | 1787 | (uint64_t) be64toh(packet_index.offset)); |
d3e2ba59 JD |
1788 | viewer_index.offset = packet_index.offset; |
1789 | viewer_index.packet_size = packet_index.packet_size; | |
1790 | viewer_index.content_size = packet_index.content_size; | |
1791 | viewer_index.timestamp_begin = packet_index.timestamp_begin; | |
1792 | viewer_index.timestamp_end = packet_index.timestamp_end; | |
1793 | viewer_index.events_discarded = packet_index.events_discarded; | |
1794 | viewer_index.stream_id = packet_index.stream_id; | |
1795 | ||
1796 | send_reply: | |
f1883937 MD |
1797 | if (rstream) { |
1798 | pthread_mutex_unlock(&rstream->lock); | |
1799 | } | |
7591bab1 MD |
1800 | |
1801 | if (metadata_viewer_stream) { | |
1802 | pthread_mutex_lock(&metadata_viewer_stream->stream->lock); | |
1803 | DBG("get next index metadata check: recv %" PRIu64 | |
1804 | " sent %" PRIu64, | |
1805 | metadata_viewer_stream->stream->metadata_received, | |
1806 | metadata_viewer_stream->metadata_sent); | |
1807 | if (!metadata_viewer_stream->stream->metadata_received || | |
1808 | metadata_viewer_stream->stream->metadata_received > | |
1809 | metadata_viewer_stream->metadata_sent) { | |
1810 | viewer_index.flags |= LTTNG_VIEWER_FLAG_NEW_METADATA; | |
1811 | } | |
1812 | pthread_mutex_unlock(&metadata_viewer_stream->stream->lock); | |
1813 | } | |
1814 | ||
d3e2ba59 | 1815 | viewer_index.flags = htobe32(viewer_index.flags); |
eea7556c | 1816 | health_code_update(); |
2f8f53af | 1817 | |
58eb9381 | 1818 | ret = send_response(conn->sock, &viewer_index, sizeof(viewer_index)); |
d3e2ba59 | 1819 | if (ret < 0) { |
7591bab1 | 1820 | goto end; |
d3e2ba59 | 1821 | } |
eea7556c | 1822 | health_code_update(); |
d3e2ba59 | 1823 | |
9237e6a1 MD |
1824 | if (vstream) { |
1825 | DBG("Index %" PRIu64 " for stream %" PRIu64 " sent", | |
a44ca2ca | 1826 | vstream->index_sent_seqcount, |
9237e6a1 MD |
1827 | vstream->stream->stream_handle); |
1828 | } | |
d3e2ba59 | 1829 | end: |
7591bab1 MD |
1830 | if (metadata_viewer_stream) { |
1831 | viewer_stream_put(metadata_viewer_stream); | |
1832 | } | |
1833 | if (vstream) { | |
1834 | viewer_stream_put(vstream); | |
1835 | } | |
1836 | return ret; | |
1837 | ||
1838 | error_put: | |
1839 | pthread_mutex_unlock(&rstream->lock); | |
1840 | if (metadata_viewer_stream) { | |
1841 | viewer_stream_put(metadata_viewer_stream); | |
1842 | } | |
1843 | viewer_stream_put(vstream); | |
d3e2ba59 JD |
1844 | return ret; |
1845 | } | |
1846 | ||
1847 | /* | |
1848 | * Send the next index for a stream | |
1849 | * | |
1850 | * Return 0 on success or else a negative value. | |
1851 | */ | |
1852 | static | |
58eb9381 | 1853 | int viewer_get_packet(struct relay_connection *conn) |
d3e2ba59 | 1854 | { |
b6025e94 | 1855 | int ret; |
a5df8828 | 1856 | off_t lseek_ret; |
553b2adb | 1857 | char *reply = NULL; |
d3e2ba59 | 1858 | struct lttng_viewer_get_packet get_packet_info; |
553b2adb | 1859 | struct lttng_viewer_trace_packet reply_header; |
7591bab1 | 1860 | struct relay_viewer_stream *vstream = NULL; |
553b2adb | 1861 | uint32_t reply_size = sizeof(reply_header); |
b6025e94 JR |
1862 | uint32_t packet_data_len = 0; |
1863 | ssize_t read_len; | |
8bb66c3c | 1864 | uint64_t stream_id; |
d3e2ba59 JD |
1865 | |
1866 | DBG2("Relay get data packet"); | |
1867 | ||
eea7556c | 1868 | health_code_update(); |
2f8f53af | 1869 | |
7591bab1 MD |
1870 | ret = recv_request(conn->sock, &get_packet_info, |
1871 | sizeof(get_packet_info)); | |
2f8f53af | 1872 | if (ret < 0) { |
d3e2ba59 JD |
1873 | goto end; |
1874 | } | |
eea7556c | 1875 | health_code_update(); |
d3e2ba59 | 1876 | |
0233a6a5 | 1877 | /* From this point on, the error label can be reached. */ |
553b2adb | 1878 | memset(&reply_header, 0, sizeof(reply_header)); |
8bb66c3c | 1879 | stream_id = (uint64_t) be64toh(get_packet_info.stream_id); |
0233a6a5 | 1880 | |
8bb66c3c | 1881 | vstream = viewer_stream_get_by_id(stream_id); |
7591bab1 | 1882 | if (!vstream) { |
a44ca2ca | 1883 | DBG("Client requested packet of unknown stream id %" PRIu64, |
8bb66c3c | 1884 | stream_id); |
553b2adb JG |
1885 | reply_header.status = htobe32(LTTNG_VIEWER_GET_PACKET_ERR); |
1886 | goto send_reply_nolock; | |
b6025e94 JR |
1887 | } else { |
1888 | packet_data_len = be32toh(get_packet_info.len); | |
553b2adb | 1889 | reply_size += packet_data_len; |
d3e2ba59 | 1890 | } |
2a174661 | 1891 | |
553b2adb JG |
1892 | reply = zmalloc(reply_size); |
1893 | if (!reply) { | |
1894 | PERROR("packet reply zmalloc"); | |
1895 | reply_size = sizeof(reply_header); | |
d3e2ba59 JD |
1896 | goto error; |
1897 | } | |
1898 | ||
b6025e94 | 1899 | pthread_mutex_lock(&vstream->stream->lock); |
8bb66c3c | 1900 | lseek_ret = fs_handle_seek(vstream->stream_file.handle, |
ebb29c10 | 1901 | be64toh(get_packet_info.offset), SEEK_SET); |
a5df8828 | 1902 | if (lseek_ret < 0) { |
8bb66c3c JG |
1903 | PERROR("Failed to seek file system handle of viewer stream %" PRIu64 |
1904 | " to offset %" PRIu64, | |
1905 | stream_id, | |
ebb29c10 | 1906 | (uint64_t) be64toh(get_packet_info.offset)); |
7591bab1 | 1907 | goto error; |
d3e2ba59 | 1908 | } |
8bb66c3c | 1909 | read_len = fs_handle_read(vstream->stream_file.handle, |
ebb29c10 | 1910 | reply + sizeof(reply_header), packet_data_len); |
b6025e94 | 1911 | if (read_len < packet_data_len) { |
8bb66c3c JG |
1912 | PERROR("Failed to read from file system handle of viewer stream id %" PRIu64 |
1913 | ", offset: %" PRIu64, | |
1914 | stream_id, | |
9b9f9f94 | 1915 | (uint64_t) be64toh(get_packet_info.offset)); |
7591bab1 | 1916 | goto error; |
d3e2ba59 | 1917 | } |
553b2adb JG |
1918 | reply_header.status = htobe32(LTTNG_VIEWER_GET_PACKET_OK); |
1919 | reply_header.len = htobe32(packet_data_len); | |
d3e2ba59 JD |
1920 | goto send_reply; |
1921 | ||
1922 | error: | |
f28ecb10 JG |
1923 | /* No payload to send on error. */ |
1924 | reply_size = sizeof(reply_header); | |
553b2adb | 1925 | reply_header.status = htobe32(LTTNG_VIEWER_GET_PACKET_ERR); |
d3e2ba59 JD |
1926 | |
1927 | send_reply: | |
7591bab1 MD |
1928 | if (vstream) { |
1929 | pthread_mutex_unlock(&vstream->stream->lock); | |
1930 | } | |
1931 | send_reply_nolock: | |
eea7556c MD |
1932 | |
1933 | health_code_update(); | |
2f8f53af | 1934 | |
553b2adb JG |
1935 | if (reply) { |
1936 | memcpy(reply, &reply_header, sizeof(reply_header)); | |
1937 | ret = send_response(conn->sock, reply, reply_size); | |
1938 | } else { | |
1939 | /* No reply to send. */ | |
1940 | ret = send_response(conn->sock, &reply_header, | |
1941 | reply_size); | |
1942 | } | |
1943 | ||
b6025e94 | 1944 | health_code_update(); |
d3e2ba59 | 1945 | if (ret < 0) { |
b6025e94 | 1946 | PERROR("sendmsg of packet data failed"); |
7591bab1 | 1947 | goto end_free; |
d3e2ba59 | 1948 | } |
d3e2ba59 | 1949 | |
8bb66c3c | 1950 | DBG("Sent %u bytes for stream %" PRIu64, reply_size, stream_id); |
d3e2ba59 | 1951 | |
7591bab1 | 1952 | end_free: |
553b2adb | 1953 | free(reply); |
d3e2ba59 | 1954 | end: |
7591bab1 MD |
1955 | if (vstream) { |
1956 | viewer_stream_put(vstream); | |
1957 | } | |
d3e2ba59 JD |
1958 | return ret; |
1959 | } | |
1960 | ||
1961 | /* | |
1962 | * Send the session's metadata | |
1963 | * | |
1964 | * Return 0 on success else a negative value. | |
1965 | */ | |
1966 | static | |
58eb9381 | 1967 | int viewer_get_metadata(struct relay_connection *conn) |
d3e2ba59 JD |
1968 | { |
1969 | int ret = 0; | |
8bb66c3c | 1970 | int fd = -1; |
d3e2ba59 JD |
1971 | ssize_t read_len; |
1972 | uint64_t len = 0; | |
1973 | char *data = NULL; | |
1974 | struct lttng_viewer_get_metadata request; | |
1975 | struct lttng_viewer_metadata_packet reply; | |
7591bab1 | 1976 | struct relay_viewer_stream *vstream = NULL; |
d3e2ba59 | 1977 | |
58eb9381 | 1978 | assert(conn); |
d3e2ba59 JD |
1979 | |
1980 | DBG("Relay get metadata"); | |
1981 | ||
eea7556c | 1982 | health_code_update(); |
2f8f53af | 1983 | |
58eb9381 | 1984 | ret = recv_request(conn->sock, &request, sizeof(request)); |
2f8f53af | 1985 | if (ret < 0) { |
d3e2ba59 JD |
1986 | goto end; |
1987 | } | |
eea7556c | 1988 | health_code_update(); |
d3e2ba59 | 1989 | |
53efb85a MD |
1990 | memset(&reply, 0, sizeof(reply)); |
1991 | ||
7591bab1 MD |
1992 | vstream = viewer_stream_get_by_id(be64toh(request.stream_id)); |
1993 | if (!vstream) { | |
3b463131 MD |
1994 | /* |
1995 | * The metadata stream can be closed by a CLOSE command | |
1996 | * just before we attach. It can also be closed by | |
1997 | * per-pid tracing during tracing. Therefore, it is | |
1998 | * possible that we cannot find this viewer stream. | |
1999 | * Reply back to the client with an error if we cannot | |
2000 | * find it. | |
2001 | */ | |
a44ca2ca | 2002 | DBG("Client requested metadata of unknown stream id %" PRIu64, |
9b9f9f94 | 2003 | (uint64_t) be64toh(request.stream_id)); |
3b463131 | 2004 | reply.status = htobe32(LTTNG_VIEWER_METADATA_ERR); |
7591bab1 | 2005 | goto send_reply; |
d3e2ba59 | 2006 | } |
7591bab1 MD |
2007 | pthread_mutex_lock(&vstream->stream->lock); |
2008 | if (!vstream->stream->is_metadata) { | |
2009 | ERR("Invalid metadata stream"); | |
6763619c JD |
2010 | goto error; |
2011 | } | |
2012 | ||
b0d240a2 | 2013 | if (vstream->metadata_sent >= vstream->stream->metadata_received) { |
94f73d08 MD |
2014 | /* |
2015 | * The live viewers expect to receive a NO_NEW_METADATA | |
2016 | * status before a stream disappears, otherwise they abort the | |
2017 | * entire live connection when receiving an error status. | |
b0d240a2 MD |
2018 | * |
2019 | * Clear feature resets the metadata_sent to 0 until the | |
2020 | * same metadata is received again. | |
94f73d08 | 2021 | */ |
c4e361a4 | 2022 | reply.status = htobe32(LTTNG_VIEWER_NO_NEW_METADATA); |
94f73d08 MD |
2023 | /* |
2024 | * The live viewer considers a closed 0 byte metadata stream as | |
2025 | * an error. | |
2026 | */ | |
2027 | if (vstream->metadata_sent > 0) { | |
50c089cf | 2028 | if (vstream->stream->closed && vstream->stream->no_new_metadata_notified) { |
94f73d08 MD |
2029 | /* Release ownership for the viewer metadata stream. */ |
2030 | viewer_stream_put(vstream); | |
2031 | } | |
50c089cf | 2032 | vstream->stream->no_new_metadata_notified = true; |
94f73d08 | 2033 | } |
d3e2ba59 JD |
2034 | goto send_reply; |
2035 | } | |
2036 | ||
ad8bec24 JG |
2037 | if (vstream->stream->trace_chunk && |
2038 | !lttng_trace_chunk_ids_equal( | |
2039 | conn->viewer_session->current_trace_chunk, | |
2040 | vstream->stream->trace_chunk)) { | |
2041 | /* A rotation has occurred on the relay stream. */ | |
2042 | DBG("Metadata relay stream and viewer chunk ids differ"); | |
2043 | ||
2044 | ret = viewer_session_set_trace_chunk_copy( | |
2045 | conn->viewer_session, | |
2046 | vstream->stream->trace_chunk); | |
2047 | if (ret) { | |
2048 | reply.status = htobe32(LTTNG_VIEWER_METADATA_ERR); | |
2049 | goto send_reply; | |
2050 | } | |
2051 | } | |
2052 | ||
7a962c33 | 2053 | if (conn->viewer_session->current_trace_chunk && |
17cb7bac MD |
2054 | !lttng_trace_chunk_ids_equal(conn->viewer_session->current_trace_chunk, |
2055 | vstream->stream_file.trace_chunk)) { | |
ad8bec24 JG |
2056 | bool acquired_reference; |
2057 | ||
2058 | DBG("Viewer session and viewer stream chunk differ: " | |
2059 | "vsession chunk %p vstream chunk %p", | |
2060 | conn->viewer_session->current_trace_chunk, | |
2061 | vstream->stream_file.trace_chunk); | |
2062 | lttng_trace_chunk_put(vstream->stream_file.trace_chunk); | |
2063 | acquired_reference = lttng_trace_chunk_get(conn->viewer_session->current_trace_chunk); | |
2064 | assert(acquired_reference); | |
2065 | vstream->stream_file.trace_chunk = | |
2066 | conn->viewer_session->current_trace_chunk; | |
2067 | viewer_stream_close_files(vstream); | |
2068 | } | |
2069 | ||
b0d240a2 MD |
2070 | len = vstream->stream->metadata_received - vstream->metadata_sent; |
2071 | ||
7a962c33 JG |
2072 | if (!vstream->stream_file.trace_chunk) { |
2073 | reply.status = htobe32(LTTNG_VIEWER_NO_NEW_METADATA); | |
2074 | len = 0; | |
2075 | goto send_reply; | |
2076 | } else if (vstream->stream_file.trace_chunk && | |
2077 | !vstream->stream_file.handle && len > 0) { | |
2078 | /* | |
2079 | * Either this is the first time the metadata file is read, or a | |
2080 | * rotation of the corresponding relay stream has occurred. | |
2081 | */ | |
8bb66c3c | 2082 | struct fs_handle *fs_handle; |
ebb29c10 JG |
2083 | char file_path[LTTNG_PATH_MAX]; |
2084 | enum lttng_trace_chunk_status status; | |
2085 | struct relay_stream *rstream = vstream->stream; | |
2086 | ||
2087 | ret = utils_stream_file_path(rstream->path_name, | |
2088 | rstream->channel_name, rstream->tracefile_size, | |
2089 | vstream->current_tracefile_id, NULL, file_path, | |
2090 | sizeof(file_path)); | |
d3e2ba59 JD |
2091 | if (ret < 0) { |
2092 | goto error; | |
2093 | } | |
ebb29c10 | 2094 | |
3ff5c5db MD |
2095 | /* |
2096 | * It is possible the the metadata file we are trying to open is | |
2097 | * missing if the stream has been closed (application exits with | |
2098 | * per-pid buffers) and a clear command has been performed. | |
2099 | */ | |
8bb66c3c | 2100 | status = lttng_trace_chunk_open_fs_handle( |
ebb29c10 | 2101 | vstream->stream_file.trace_chunk, |
8bb66c3c | 2102 | file_path, O_RDONLY, 0, &fs_handle, true); |
ebb29c10 | 2103 | if (status != LTTNG_TRACE_CHUNK_STATUS_OK) { |
b0d240a2 MD |
2104 | if (status == LTTNG_TRACE_CHUNK_STATUS_NO_FILE) { |
2105 | reply.status = htobe32(LTTNG_VIEWER_NO_NEW_METADATA); | |
2106 | len = 0; | |
2107 | if (vstream->stream->closed) { | |
2108 | viewer_stream_put(vstream); | |
2109 | } | |
2110 | goto send_reply; | |
2111 | } | |
ebb29c10 | 2112 | PERROR("Failed to open metadata file for viewer stream"); |
d3e2ba59 JD |
2113 | goto error; |
2114 | } | |
8bb66c3c | 2115 | vstream->stream_file.handle = fs_handle; |
ad8bec24 JG |
2116 | |
2117 | if (vstream->metadata_sent != 0) { | |
2118 | /* | |
2119 | * The client does not expect to receive any metadata | |
2120 | * it has received and metadata files in successive | |
2121 | * chunks must be a strict superset of one another. | |
2122 | * | |
2123 | * Skip the first `metadata_sent` bytes to ensure | |
2124 | * they are not sent a second time to the client. | |
2125 | * | |
2126 | * Baring a block layer error or an internal error, | |
2127 | * this seek should not fail as | |
2128 | * `vstream->stream->metadata_received` is reset when | |
2129 | * a relay stream is rotated. If this is reached, it is | |
2130 | * safe to assume that | |
2131 | * `metadata_received` > `metadata_sent`. | |
2132 | */ | |
2133 | const off_t seek_ret = fs_handle_seek(fs_handle, | |
2134 | vstream->metadata_sent, SEEK_SET); | |
2135 | ||
2136 | if (seek_ret < 0) { | |
2137 | PERROR("Failed to seek metadata viewer stream file to `sent` position: pos = %" PRId64, | |
2138 | vstream->metadata_sent); | |
2139 | reply.status = htobe32(LTTNG_VIEWER_METADATA_ERR); | |
2140 | goto send_reply; | |
2141 | } | |
2142 | } | |
d3e2ba59 JD |
2143 | } |
2144 | ||
2145 | reply.len = htobe64(len); | |
2146 | data = zmalloc(len); | |
2147 | if (!data) { | |
2148 | PERROR("viewer metadata zmalloc"); | |
2149 | goto error; | |
2150 | } | |
2151 | ||
8bb66c3c JG |
2152 | fd = fs_handle_get_fd(vstream->stream_file.handle); |
2153 | if (fd < 0) { | |
2154 | ERR("Failed to restore viewer stream file system handle"); | |
2155 | goto error; | |
2156 | } | |
2157 | read_len = lttng_read(fd, data, len); | |
2158 | fs_handle_put_fd(vstream->stream_file.handle); | |
2159 | fd = -1; | |
6cd525e8 | 2160 | if (read_len < len) { |
ad8bec24 JG |
2161 | if (read_len < 0) { |
2162 | PERROR("Failed to read metadata file"); | |
2163 | goto error; | |
2164 | } else { | |
2165 | /* | |
2166 | * A clear has been performed which prevents the relay | |
2167 | * from sending `len` bytes of metadata. | |
2168 | * | |
2169 | * It is important not to send any metadata if we | |
2170 | * couldn't read all the available metadata in one shot: | |
2171 | * sending partial metadata can cause the client to | |
2172 | * attempt to parse an incomplete (incoherent) metadata | |
2173 | * stream, which would result in an error. | |
2174 | */ | |
2175 | const off_t seek_ret = fs_handle_seek( | |
2176 | vstream->stream_file.handle, -read_len, | |
2177 | SEEK_CUR); | |
2178 | ||
cfa1e2c2 | 2179 | DBG("Failed to read metadata: requested = %" PRIu64 ", got = %zd", |
ad8bec24 JG |
2180 | len, read_len); |
2181 | read_len = 0; | |
2182 | len = 0; | |
2183 | if (seek_ret < 0) { | |
2184 | PERROR("Failed to restore metadata file position after partial read"); | |
2185 | ret = -1; | |
2186 | goto error; | |
2187 | } | |
2188 | } | |
d3e2ba59 | 2189 | } |
7591bab1 | 2190 | vstream->metadata_sent += read_len; |
c4e361a4 | 2191 | reply.status = htobe32(LTTNG_VIEWER_METADATA_OK); |
7591bab1 | 2192 | |
d3e2ba59 JD |
2193 | goto send_reply; |
2194 | ||
2195 | error: | |
c4e361a4 | 2196 | reply.status = htobe32(LTTNG_VIEWER_METADATA_ERR); |
d3e2ba59 JD |
2197 | |
2198 | send_reply: | |
eea7556c | 2199 | health_code_update(); |
7591bab1 MD |
2200 | if (vstream) { |
2201 | pthread_mutex_unlock(&vstream->stream->lock); | |
2202 | } | |
58eb9381 | 2203 | ret = send_response(conn->sock, &reply, sizeof(reply)); |
d3e2ba59 | 2204 | if (ret < 0) { |
7591bab1 | 2205 | goto end_free; |
d3e2ba59 | 2206 | } |
eea7556c | 2207 | health_code_update(); |
d3e2ba59 JD |
2208 | |
2209 | if (len > 0) { | |
58eb9381 | 2210 | ret = send_response(conn->sock, data, len); |
d3e2ba59 | 2211 | if (ret < 0) { |
7591bab1 | 2212 | goto end_free; |
d3e2ba59 JD |
2213 | } |
2214 | } | |
2215 | ||
2216 | DBG("Sent %" PRIu64 " bytes of metadata for stream %" PRIu64, len, | |
9b9f9f94 | 2217 | (uint64_t) be64toh(request.stream_id)); |
d3e2ba59 JD |
2218 | |
2219 | DBG("Metadata sent"); | |
2220 | ||
7591bab1 | 2221 | end_free: |
d3e2ba59 | 2222 | free(data); |
d3e2ba59 | 2223 | end: |
7591bab1 MD |
2224 | if (vstream) { |
2225 | viewer_stream_put(vstream); | |
2226 | } | |
d3e2ba59 JD |
2227 | return ret; |
2228 | } | |
2229 | ||
c3b7390b JD |
2230 | /* |
2231 | * Create a viewer session. | |
2232 | * | |
2233 | * Return 0 on success or else a negative value. | |
2234 | */ | |
2235 | static | |
2236 | int viewer_create_session(struct relay_connection *conn) | |
2237 | { | |
2238 | int ret; | |
2239 | struct lttng_viewer_create_session_response resp; | |
2240 | ||
2241 | DBG("Viewer create session received"); | |
2242 | ||
53efb85a | 2243 | memset(&resp, 0, sizeof(resp)); |
c3b7390b | 2244 | resp.status = htobe32(LTTNG_VIEWER_CREATE_SESSION_OK); |
7591bab1 | 2245 | conn->viewer_session = viewer_session_create(); |
c3b7390b JD |
2246 | if (!conn->viewer_session) { |
2247 | ERR("Allocation viewer session"); | |
2248 | resp.status = htobe32(LTTNG_VIEWER_CREATE_SESSION_ERR); | |
2249 | goto send_reply; | |
2250 | } | |
c3b7390b JD |
2251 | |
2252 | send_reply: | |
2253 | health_code_update(); | |
2254 | ret = send_response(conn->sock, &resp, sizeof(resp)); | |
2255 | if (ret < 0) { | |
2256 | goto end; | |
2257 | } | |
2258 | health_code_update(); | |
2259 | ret = 0; | |
2260 | ||
2261 | end: | |
2262 | return ret; | |
2263 | } | |
2264 | ||
d62023be JD |
2265 | /* |
2266 | * Detach a viewer session. | |
2267 | * | |
2268 | * Return 0 on success or else a negative value. | |
2269 | */ | |
2270 | static | |
2271 | int viewer_detach_session(struct relay_connection *conn) | |
2272 | { | |
2273 | int ret; | |
2274 | struct lttng_viewer_detach_session_response response; | |
2275 | struct lttng_viewer_detach_session_request request; | |
2276 | struct relay_session *session = NULL; | |
2277 | uint64_t viewer_session_to_close; | |
2278 | ||
2279 | DBG("Viewer detach session received"); | |
2280 | ||
2281 | assert(conn); | |
2282 | ||
2283 | health_code_update(); | |
2284 | ||
2285 | /* Receive the request from the connected client. */ | |
2286 | ret = recv_request(conn->sock, &request, sizeof(request)); | |
2287 | if (ret < 0) { | |
2288 | goto end; | |
2289 | } | |
2290 | viewer_session_to_close = be64toh(request.session_id); | |
2291 | ||
2292 | if (!conn->viewer_session) { | |
2293 | DBG("Client trying to detach before creating a live viewer session"); | |
2294 | response.status = htobe32(LTTNG_VIEWER_DETACH_SESSION_ERR); | |
2295 | goto send_reply; | |
2296 | } | |
2297 | ||
2298 | health_code_update(); | |
2299 | ||
2300 | memset(&response, 0, sizeof(response)); | |
2301 | DBG("Detaching from session ID %" PRIu64, viewer_session_to_close); | |
2302 | ||
2303 | session = session_get_by_id(be64toh(request.session_id)); | |
2304 | if (!session) { | |
2305 | DBG("Relay session %" PRIu64 " not found", | |
9b9f9f94 | 2306 | (uint64_t) be64toh(request.session_id)); |
d62023be JD |
2307 | response.status = htobe32(LTTNG_VIEWER_DETACH_SESSION_UNK); |
2308 | goto send_reply; | |
2309 | } | |
2310 | ||
2311 | ret = viewer_session_is_attached(conn->viewer_session, session); | |
2312 | if (ret != 1) { | |
2313 | DBG("Not attached to this session"); | |
2314 | response.status = htobe32(LTTNG_VIEWER_DETACH_SESSION_ERR); | |
2315 | goto send_reply_put; | |
2316 | } | |
2317 | ||
2318 | viewer_session_close_one_session(conn->viewer_session, session); | |
2319 | response.status = htobe32(LTTNG_VIEWER_DETACH_SESSION_OK); | |
2320 | DBG("Session %" PRIu64 " detached.", viewer_session_to_close); | |
2321 | ||
2322 | send_reply_put: | |
2323 | session_put(session); | |
2324 | ||
2325 | send_reply: | |
2326 | health_code_update(); | |
2327 | ret = send_response(conn->sock, &response, sizeof(response)); | |
2328 | if (ret < 0) { | |
2329 | goto end; | |
2330 | } | |
2331 | health_code_update(); | |
2332 | ret = 0; | |
2333 | ||
2334 | end: | |
2335 | return ret; | |
2336 | } | |
c3b7390b | 2337 | |
d3e2ba59 JD |
2338 | /* |
2339 | * live_relay_unknown_command: send -1 if received unknown command | |
2340 | */ | |
2341 | static | |
58eb9381 | 2342 | void live_relay_unknown_command(struct relay_connection *conn) |
d3e2ba59 JD |
2343 | { |
2344 | struct lttcomm_relayd_generic_reply reply; | |
d3e2ba59 | 2345 | |
53efb85a | 2346 | memset(&reply, 0, sizeof(reply)); |
d3e2ba59 | 2347 | reply.ret_code = htobe32(LTTNG_ERR_UNK); |
58eb9381 | 2348 | (void) send_response(conn->sock, &reply, sizeof(reply)); |
d3e2ba59 JD |
2349 | } |
2350 | ||
2351 | /* | |
2352 | * Process the commands received on the control socket | |
2353 | */ | |
2354 | static | |
2355 | int process_control(struct lttng_viewer_cmd *recv_hdr, | |
58eb9381 | 2356 | struct relay_connection *conn) |
d3e2ba59 JD |
2357 | { |
2358 | int ret = 0; | |
2f8f53af DG |
2359 | uint32_t msg_value; |
2360 | ||
2f8f53af DG |
2361 | msg_value = be32toh(recv_hdr->cmd); |
2362 | ||
2363 | /* | |
2364 | * Make sure we've done the version check before any command other then a | |
2365 | * new client connection. | |
2366 | */ | |
c4e361a4 | 2367 | if (msg_value != LTTNG_VIEWER_CONNECT && !conn->version_check_done) { |
58eb9381 | 2368 | ERR("Viewer conn value %" PRIu32 " before version check", msg_value); |
2f8f53af DG |
2369 | ret = -1; |
2370 | goto end; | |
2371 | } | |
d3e2ba59 | 2372 | |
2f8f53af | 2373 | switch (msg_value) { |
c4e361a4 | 2374 | case LTTNG_VIEWER_CONNECT: |
58eb9381 | 2375 | ret = viewer_connect(conn); |
d3e2ba59 | 2376 | break; |
c4e361a4 | 2377 | case LTTNG_VIEWER_LIST_SESSIONS: |
58eb9381 | 2378 | ret = viewer_list_sessions(conn); |
d3e2ba59 | 2379 | break; |
c4e361a4 | 2380 | case LTTNG_VIEWER_ATTACH_SESSION: |
58eb9381 | 2381 | ret = viewer_attach_session(conn); |
d3e2ba59 | 2382 | break; |
c4e361a4 | 2383 | case LTTNG_VIEWER_GET_NEXT_INDEX: |
58eb9381 | 2384 | ret = viewer_get_next_index(conn); |
d3e2ba59 | 2385 | break; |
c4e361a4 | 2386 | case LTTNG_VIEWER_GET_PACKET: |
58eb9381 | 2387 | ret = viewer_get_packet(conn); |
d3e2ba59 | 2388 | break; |
c4e361a4 | 2389 | case LTTNG_VIEWER_GET_METADATA: |
58eb9381 | 2390 | ret = viewer_get_metadata(conn); |
d3e2ba59 | 2391 | break; |
c4e361a4 | 2392 | case LTTNG_VIEWER_GET_NEW_STREAMS: |
58eb9381 | 2393 | ret = viewer_get_new_streams(conn); |
80e8027a | 2394 | break; |
c3b7390b JD |
2395 | case LTTNG_VIEWER_CREATE_SESSION: |
2396 | ret = viewer_create_session(conn); | |
2397 | break; | |
d62023be JD |
2398 | case LTTNG_VIEWER_DETACH_SESSION: |
2399 | ret = viewer_detach_session(conn); | |
2400 | break; | |
d3e2ba59 | 2401 | default: |
7591bab1 MD |
2402 | ERR("Received unknown viewer command (%u)", |
2403 | be32toh(recv_hdr->cmd)); | |
58eb9381 | 2404 | live_relay_unknown_command(conn); |
d3e2ba59 JD |
2405 | ret = -1; |
2406 | goto end; | |
2407 | } | |
2408 | ||
2409 | end: | |
2410 | return ret; | |
2411 | } | |
2412 | ||
2413 | static | |
58eb9381 | 2414 | void cleanup_connection_pollfd(struct lttng_poll_event *events, int pollfd) |
d3e2ba59 JD |
2415 | { |
2416 | int ret; | |
2417 | ||
58eb9381 | 2418 | (void) lttng_poll_del(events, pollfd); |
d3e2ba59 | 2419 | |
29555a78 JG |
2420 | ret = fd_tracker_close_unsuspendable_fd(the_fd_tracker, &pollfd, 1, |
2421 | fd_tracker_util_close_fd, NULL); | |
d3e2ba59 JD |
2422 | if (ret < 0) { |
2423 | ERR("Closing pollfd %d", pollfd); | |
2424 | } | |
2425 | } | |
2426 | ||
d3e2ba59 JD |
2427 | /* |
2428 | * This thread does the actual work | |
2429 | */ | |
2430 | static | |
2431 | void *thread_worker(void *data) | |
2432 | { | |
2433 | int ret, err = -1; | |
2434 | uint32_t nb_fd; | |
d3e2ba59 | 2435 | struct lttng_poll_event events; |
7591bab1 | 2436 | struct lttng_ht *viewer_connections_ht; |
d3e2ba59 JD |
2437 | struct lttng_ht_iter iter; |
2438 | struct lttng_viewer_cmd recv_hdr; | |
302d8906 | 2439 | struct relay_connection *destroy_conn; |
d3e2ba59 JD |
2440 | |
2441 | DBG("[thread] Live viewer relay worker started"); | |
2442 | ||
2443 | rcu_register_thread(); | |
2444 | ||
eea7556c MD |
2445 | health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_WORKER); |
2446 | ||
9b5e0863 MD |
2447 | if (testpoint(relayd_thread_live_worker)) { |
2448 | goto error_testpoint; | |
2449 | } | |
2450 | ||
d3e2ba59 | 2451 | /* table of connections indexed on socket */ |
7591bab1 MD |
2452 | viewer_connections_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
2453 | if (!viewer_connections_ht) { | |
2454 | goto viewer_connections_ht_error; | |
d3e2ba59 JD |
2455 | } |
2456 | ||
35bc1f58 JG |
2457 | ret = create_named_thread_poll_set(&events, 2, |
2458 | "Live viewer worker thread epoll"); | |
d3e2ba59 JD |
2459 | if (ret < 0) { |
2460 | goto error_poll_create; | |
2461 | } | |
2462 | ||
58eb9381 | 2463 | ret = lttng_poll_add(&events, live_conn_pipe[0], LPOLLIN | LPOLLRDHUP); |
d3e2ba59 JD |
2464 | if (ret < 0) { |
2465 | goto error; | |
2466 | } | |
2467 | ||
2468 | restart: | |
2469 | while (1) { | |
2470 | int i; | |
2471 | ||
eea7556c MD |
2472 | health_code_update(); |
2473 | ||
d3e2ba59 JD |
2474 | /* Infinite blocking call, waiting for transmission */ |
2475 | DBG3("Relayd live viewer worker thread polling..."); | |
eea7556c | 2476 | health_poll_entry(); |
d3e2ba59 | 2477 | ret = lttng_poll_wait(&events, -1); |
eea7556c | 2478 | health_poll_exit(); |
d3e2ba59 JD |
2479 | if (ret < 0) { |
2480 | /* | |
2481 | * Restart interrupted system call. | |
2482 | */ | |
2483 | if (errno == EINTR) { | |
2484 | goto restart; | |
2485 | } | |
2486 | goto error; | |
2487 | } | |
2488 | ||
2489 | nb_fd = ret; | |
2490 | ||
2491 | /* | |
2492 | * Process control. The control connection is prioritised so we don't | |
2493 | * starve it with high throughput tracing data on the data | |
2494 | * connection. | |
2495 | */ | |
2496 | for (i = 0; i < nb_fd; i++) { | |
2497 | /* Fetch once the poll data */ | |
2498 | uint32_t revents = LTTNG_POLL_GETEV(&events, i); | |
2499 | int pollfd = LTTNG_POLL_GETFD(&events, i); | |
2500 | ||
eea7556c MD |
2501 | health_code_update(); |
2502 | ||
d3e2ba59 | 2503 | /* Thread quit pipe has been closed. Killing thread. */ |
bcf4a440 | 2504 | ret = check_thread_quit_pipe(pollfd, revents); |
d3e2ba59 JD |
2505 | if (ret) { |
2506 | err = 0; | |
2507 | goto exit; | |
2508 | } | |
2509 | ||
7591bab1 | 2510 | /* Inspect the relay conn pipe for new connection. */ |
58eb9381 | 2511 | if (pollfd == live_conn_pipe[0]) { |
03e43155 | 2512 | if (revents & LPOLLIN) { |
302d8906 JG |
2513 | struct relay_connection *conn; |
2514 | ||
7591bab1 MD |
2515 | ret = lttng_read(live_conn_pipe[0], |
2516 | &conn, sizeof(conn)); | |
d3e2ba59 JD |
2517 | if (ret < 0) { |
2518 | goto error; | |
2519 | } | |
73039936 FD |
2520 | ret = lttng_poll_add(&events, |
2521 | conn->sock->fd, | |
58eb9381 | 2522 | LPOLLIN | LPOLLRDHUP); |
73039936 FD |
2523 | if (ret) { |
2524 | ERR("Failed to add new live connection file descriptor to poll set"); | |
2525 | goto error; | |
2526 | } | |
7591bab1 MD |
2527 | connection_ht_add(viewer_connections_ht, conn); |
2528 | DBG("Connection socket %d added to poll", conn->sock->fd); | |
03e43155 MD |
2529 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
2530 | ERR("Relay live pipe error"); | |
2531 | goto error; | |
2532 | } else { | |
2533 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
2534 | goto error; | |
d3e2ba59 | 2535 | } |
58eb9381 | 2536 | } else { |
7591bab1 | 2537 | /* Connection activity. */ |
302d8906 JG |
2538 | struct relay_connection *conn; |
2539 | ||
7591bab1 MD |
2540 | conn = connection_get_by_sock(viewer_connections_ht, pollfd); |
2541 | if (!conn) { | |
2542 | continue; | |
2543 | } | |
58eb9381 | 2544 | |
03e43155 | 2545 | if (revents & LPOLLIN) { |
58eb9381 DG |
2546 | ret = conn->sock->ops->recvmsg(conn->sock, &recv_hdr, |
2547 | sizeof(recv_hdr), 0); | |
d3e2ba59 | 2548 | if (ret <= 0) { |
7591bab1 | 2549 | /* Connection closed. */ |
58eb9381 | 2550 | cleanup_connection_pollfd(&events, pollfd); |
7591bab1 MD |
2551 | /* Put "create" ownership reference. */ |
2552 | connection_put(conn); | |
58eb9381 | 2553 | DBG("Viewer control conn closed with %d", pollfd); |
d3e2ba59 | 2554 | } else { |
58eb9381 | 2555 | ret = process_control(&recv_hdr, conn); |
d3e2ba59 JD |
2556 | if (ret < 0) { |
2557 | /* Clear the session on error. */ | |
58eb9381 | 2558 | cleanup_connection_pollfd(&events, pollfd); |
7591bab1 MD |
2559 | /* Put "create" ownership reference. */ |
2560 | connection_put(conn); | |
d3e2ba59 JD |
2561 | DBG("Viewer connection closed with %d", pollfd); |
2562 | } | |
2563 | } | |
03e43155 MD |
2564 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
2565 | cleanup_connection_pollfd(&events, pollfd); | |
2566 | /* Put "create" ownership reference. */ | |
2567 | connection_put(conn); | |
2568 | } else { | |
2569 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
2570 | connection_put(conn); | |
2571 | goto error; | |
d3e2ba59 | 2572 | } |
7591bab1 MD |
2573 | /* Put local "get_by_sock" reference. */ |
2574 | connection_put(conn); | |
d3e2ba59 JD |
2575 | } |
2576 | } | |
2577 | } | |
2578 | ||
2579 | exit: | |
2580 | error: | |
35bc1f58 | 2581 | (void) fd_tracker_util_poll_clean(the_fd_tracker, &events); |
d3e2ba59 | 2582 | |
71efa8ef | 2583 | /* Cleanup remaining connection object. */ |
d3e2ba59 | 2584 | rcu_read_lock(); |
7591bab1 | 2585 | cds_lfht_for_each_entry(viewer_connections_ht->ht, &iter.iter, |
302d8906 | 2586 | destroy_conn, |
58eb9381 | 2587 | sock_n.node) { |
eea7556c | 2588 | health_code_update(); |
7591bab1 | 2589 | connection_put(destroy_conn); |
d3e2ba59 JD |
2590 | } |
2591 | rcu_read_unlock(); | |
2592 | error_poll_create: | |
7591bab1 MD |
2593 | lttng_ht_destroy(viewer_connections_ht); |
2594 | viewer_connections_ht_error: | |
58eb9381 | 2595 | /* Close relay conn pipes */ |
87bcbe91 | 2596 | (void) fd_tracker_util_pipe_close(the_fd_tracker, live_conn_pipe); |
d3e2ba59 JD |
2597 | if (err) { |
2598 | DBG("Viewer worker thread exited with error"); | |
2599 | } | |
2600 | DBG("Viewer worker thread cleanup complete"); | |
9b5e0863 | 2601 | error_testpoint: |
eea7556c MD |
2602 | if (err) { |
2603 | health_error(); | |
2604 | ERR("Health error occurred in %s", __func__); | |
2605 | } | |
2606 | health_unregister(health_relayd); | |
b4aacfdc MD |
2607 | if (lttng_relay_stop_threads()) { |
2608 | ERR("Error stopping threads"); | |
178a0557 | 2609 | } |
d3e2ba59 JD |
2610 | rcu_unregister_thread(); |
2611 | return NULL; | |
2612 | } | |
2613 | ||
2614 | /* | |
2615 | * Create the relay command pipe to wake thread_manage_apps. | |
2616 | * Closed in cleanup(). | |
2617 | */ | |
58eb9381 | 2618 | static int create_conn_pipe(void) |
d3e2ba59 | 2619 | { |
87bcbe91 JG |
2620 | return fd_tracker_util_pipe_open_cloexec(the_fd_tracker, |
2621 | "Live connection pipe", live_conn_pipe); | |
178a0557 | 2622 | } |
d3e2ba59 | 2623 | |
178a0557 | 2624 | int relayd_live_join(void) |
d3e2ba59 | 2625 | { |
178a0557 | 2626 | int ret, retval = 0; |
d3e2ba59 JD |
2627 | void *status; |
2628 | ||
d3e2ba59 | 2629 | ret = pthread_join(live_listener_thread, &status); |
178a0557 MD |
2630 | if (ret) { |
2631 | errno = ret; | |
d3e2ba59 | 2632 | PERROR("pthread_join live listener"); |
178a0557 | 2633 | retval = -1; |
d3e2ba59 JD |
2634 | } |
2635 | ||
2636 | ret = pthread_join(live_worker_thread, &status); | |
178a0557 MD |
2637 | if (ret) { |
2638 | errno = ret; | |
d3e2ba59 | 2639 | PERROR("pthread_join live worker"); |
178a0557 | 2640 | retval = -1; |
d3e2ba59 JD |
2641 | } |
2642 | ||
2643 | ret = pthread_join(live_dispatcher_thread, &status); | |
178a0557 MD |
2644 | if (ret) { |
2645 | errno = ret; | |
d3e2ba59 | 2646 | PERROR("pthread_join live dispatcher"); |
178a0557 | 2647 | retval = -1; |
d3e2ba59 JD |
2648 | } |
2649 | ||
178a0557 | 2650 | cleanup_relayd_live(); |
d3e2ba59 | 2651 | |
178a0557 | 2652 | return retval; |
d3e2ba59 JD |
2653 | } |
2654 | ||
2655 | /* | |
2656 | * main | |
2657 | */ | |
7591bab1 | 2658 | int relayd_live_create(struct lttng_uri *uri) |
d3e2ba59 | 2659 | { |
178a0557 | 2660 | int ret = 0, retval = 0; |
d3e2ba59 JD |
2661 | void *status; |
2662 | int is_root; | |
2663 | ||
178a0557 MD |
2664 | if (!uri) { |
2665 | retval = -1; | |
2666 | goto exit_init_data; | |
2667 | } | |
d3e2ba59 JD |
2668 | live_uri = uri; |
2669 | ||
d3e2ba59 JD |
2670 | /* Check if daemon is UID = 0 */ |
2671 | is_root = !getuid(); | |
2672 | ||
2673 | if (!is_root) { | |
2674 | if (live_uri->port < 1024) { | |
2675 | ERR("Need to be root to use ports < 1024"); | |
178a0557 MD |
2676 | retval = -1; |
2677 | goto exit_init_data; | |
d3e2ba59 JD |
2678 | } |
2679 | } | |
2680 | ||
2681 | /* Setup the thread apps communication pipe. */ | |
178a0557 MD |
2682 | if (create_conn_pipe()) { |
2683 | retval = -1; | |
2684 | goto exit_init_data; | |
d3e2ba59 JD |
2685 | } |
2686 | ||
2687 | /* Init relay command queue. */ | |
8bdee6e2 | 2688 | cds_wfcq_init(&viewer_conn_queue.head, &viewer_conn_queue.tail); |
d3e2ba59 JD |
2689 | |
2690 | /* Set up max poll set size */ | |
25b397f9 MD |
2691 | if (lttng_poll_set_max_size()) { |
2692 | retval = -1; | |
2693 | goto exit_init_data; | |
2694 | } | |
d3e2ba59 JD |
2695 | |
2696 | /* Setup the dispatcher thread */ | |
1a1a34b4 | 2697 | ret = pthread_create(&live_dispatcher_thread, default_pthread_attr(), |
d3e2ba59 | 2698 | thread_dispatcher, (void *) NULL); |
178a0557 MD |
2699 | if (ret) { |
2700 | errno = ret; | |
d3e2ba59 | 2701 | PERROR("pthread_create viewer dispatcher"); |
178a0557 MD |
2702 | retval = -1; |
2703 | goto exit_dispatcher_thread; | |
d3e2ba59 JD |
2704 | } |
2705 | ||
2706 | /* Setup the worker thread */ | |
1a1a34b4 | 2707 | ret = pthread_create(&live_worker_thread, default_pthread_attr(), |
7591bab1 | 2708 | thread_worker, NULL); |
178a0557 MD |
2709 | if (ret) { |
2710 | errno = ret; | |
d3e2ba59 | 2711 | PERROR("pthread_create viewer worker"); |
178a0557 MD |
2712 | retval = -1; |
2713 | goto exit_worker_thread; | |
d3e2ba59 JD |
2714 | } |
2715 | ||
2716 | /* Setup the listener thread */ | |
1a1a34b4 | 2717 | ret = pthread_create(&live_listener_thread, default_pthread_attr(), |
d3e2ba59 | 2718 | thread_listener, (void *) NULL); |
178a0557 MD |
2719 | if (ret) { |
2720 | errno = ret; | |
d3e2ba59 | 2721 | PERROR("pthread_create viewer listener"); |
178a0557 MD |
2722 | retval = -1; |
2723 | goto exit_listener_thread; | |
d3e2ba59 JD |
2724 | } |
2725 | ||
178a0557 MD |
2726 | /* |
2727 | * All OK, started all threads. | |
2728 | */ | |
2729 | return retval; | |
2730 | ||
9911d21b JG |
2731 | /* |
2732 | * Join on the live_listener_thread should anything be added after | |
2733 | * the live_listener thread's creation. | |
2734 | */ | |
d3e2ba59 | 2735 | |
178a0557 | 2736 | exit_listener_thread: |
d3e2ba59 | 2737 | |
d3e2ba59 | 2738 | ret = pthread_join(live_worker_thread, &status); |
178a0557 MD |
2739 | if (ret) { |
2740 | errno = ret; | |
d3e2ba59 | 2741 | PERROR("pthread_join live worker"); |
178a0557 | 2742 | retval = -1; |
d3e2ba59 | 2743 | } |
178a0557 | 2744 | exit_worker_thread: |
d3e2ba59 | 2745 | |
d3e2ba59 | 2746 | ret = pthread_join(live_dispatcher_thread, &status); |
178a0557 MD |
2747 | if (ret) { |
2748 | errno = ret; | |
d3e2ba59 | 2749 | PERROR("pthread_join live dispatcher"); |
178a0557 | 2750 | retval = -1; |
d3e2ba59 | 2751 | } |
178a0557 | 2752 | exit_dispatcher_thread: |
d3e2ba59 | 2753 | |
178a0557 MD |
2754 | exit_init_data: |
2755 | cleanup_relayd_live(); | |
d3e2ba59 | 2756 | |
178a0557 | 2757 | return retval; |
d3e2ba59 | 2758 | } |