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 |
28ab034a JG |
11 | #include "cmd.hpp" |
12 | #include "connection.hpp" | |
13 | #include "ctf-trace.hpp" | |
14 | #include "health-relayd.hpp" | |
15 | #include "live.hpp" | |
16 | #include "lttng-relayd.hpp" | |
17 | #include "session.hpp" | |
18 | #include "stream.hpp" | |
19 | #include "testpoint.hpp" | |
20 | #include "utils.hpp" | |
21 | #include "viewer-session.hpp" | |
22 | #include "viewer-stream.hpp" | |
23 | ||
24 | #include <common/common.hpp> | |
25 | #include <common/compat/endian.hpp> | |
26 | #include <common/compat/poll.hpp> | |
27 | #include <common/compat/socket.hpp> | |
28 | #include <common/defaults.hpp> | |
29 | #include <common/fd-tracker/utils.hpp> | |
30 | #include <common/fs-handle.hpp> | |
31 | #include <common/futex.hpp> | |
32 | #include <common/index/index.hpp> | |
a402293a JG |
33 | #include <common/make-unique-wrapper.hpp> |
34 | #include <common/pthread-lock.hpp> | |
28ab034a JG |
35 | #include <common/sessiond-comm/inet.hpp> |
36 | #include <common/sessiond-comm/relayd.hpp> | |
37 | #include <common/sessiond-comm/sessiond-comm.hpp> | |
56047f5a | 38 | #include <common/urcu.hpp> |
28ab034a JG |
39 | #include <common/uri.hpp> |
40 | #include <common/utils.hpp> | |
41 | ||
42 | #include <lttng/lttng.h> | |
43 | ||
8bb66c3c | 44 | #include <fcntl.h> |
d3e2ba59 JD |
45 | #include <getopt.h> |
46 | #include <grp.h> | |
8bb66c3c | 47 | #include <inttypes.h> |
d3e2ba59 JD |
48 | #include <limits.h> |
49 | #include <pthread.h> | |
50 | #include <signal.h> | |
51 | #include <stdio.h> | |
52 | #include <stdlib.h> | |
53 | #include <string.h> | |
28ab034a | 54 | #include <string> |
d3e2ba59 JD |
55 | #include <sys/mman.h> |
56 | #include <sys/mount.h> | |
57 | #include <sys/resource.h> | |
58 | #include <sys/socket.h> | |
59 | #include <sys/stat.h> | |
60 | #include <sys/types.h> | |
61 | #include <sys/wait.h> | |
8bb66c3c | 62 | #include <unistd.h> |
d3e2ba59 | 63 | #include <urcu/futex.h> |
7591bab1 | 64 | #include <urcu/rculist.h> |
8bb66c3c | 65 | #include <urcu/uatomic.h> |
d3e2ba59 | 66 | |
28ab034a | 67 | #define SESSION_BUF_DEFAULT_COUNT 16 |
d3e2ba59 JD |
68 | |
69 | static struct lttng_uri *live_uri; | |
70 | ||
d3e2ba59 JD |
71 | /* |
72 | * This pipe is used to inform the worker thread that a command is queued and | |
73 | * ready to be processed. | |
74 | */ | |
58eb9381 | 75 | static int live_conn_pipe[2] = { -1, -1 }; |
d3e2ba59 JD |
76 | |
77 | /* Shared between threads */ | |
78 | static int live_dispatch_thread_exit; | |
79 | ||
80 | static pthread_t live_listener_thread; | |
81 | static pthread_t live_dispatcher_thread; | |
82 | static pthread_t live_worker_thread; | |
83 | ||
84 | /* | |
85 | * Relay command queue. | |
86 | * | |
87 | * The live_thread_listener and live_thread_dispatcher communicate with this | |
88 | * queue. | |
89 | */ | |
58eb9381 | 90 | static struct relay_conn_queue viewer_conn_queue; |
d3e2ba59 JD |
91 | |
92 | static uint64_t last_relay_viewer_session_id; | |
28ab034a | 93 | static pthread_mutex_t last_relay_viewer_session_id_lock = PTHREAD_MUTEX_INITIALIZER; |
d3e2ba59 | 94 | |
28ab034a | 95 | static const char *lttng_viewer_command_str(lttng_viewer_command cmd) |
7201079f FD |
96 | { |
97 | switch (cmd) { | |
98 | case LTTNG_VIEWER_CONNECT: | |
99 | return "CONNECT"; | |
100 | case LTTNG_VIEWER_LIST_SESSIONS: | |
101 | return "LIST_SESSIONS"; | |
102 | case LTTNG_VIEWER_ATTACH_SESSION: | |
103 | return "ATTACH_SESSION"; | |
104 | case LTTNG_VIEWER_GET_NEXT_INDEX: | |
105 | return "GET_NEXT_INDEX"; | |
106 | case LTTNG_VIEWER_GET_PACKET: | |
107 | return "GET_PACKET"; | |
108 | case LTTNG_VIEWER_GET_METADATA: | |
109 | return "GET_METADATA"; | |
110 | case LTTNG_VIEWER_GET_NEW_STREAMS: | |
111 | return "GET_NEW_STREAMS"; | |
112 | case LTTNG_VIEWER_CREATE_SESSION: | |
113 | return "CREATE_SESSION"; | |
114 | case LTTNG_VIEWER_DETACH_SESSION: | |
115 | return "DETACH_SESSION"; | |
116 | default: | |
117 | abort(); | |
118 | } | |
119 | } | |
120 | ||
28ab034a JG |
121 | static const char * |
122 | lttng_viewer_next_index_return_code_str(enum lttng_viewer_next_index_return_code code) | |
7e4fb89b FD |
123 | { |
124 | switch (code) { | |
125 | case LTTNG_VIEWER_INDEX_OK: | |
126 | return "INDEX_OK"; | |
127 | case LTTNG_VIEWER_INDEX_RETRY: | |
128 | return "INDEX_RETRY"; | |
129 | case LTTNG_VIEWER_INDEX_HUP: | |
130 | return "INDEX_HUP"; | |
131 | case LTTNG_VIEWER_INDEX_ERR: | |
132 | return "INDEX_ERR"; | |
133 | case LTTNG_VIEWER_INDEX_INACTIVE: | |
134 | return "INDEX_INACTIVE"; | |
135 | case LTTNG_VIEWER_INDEX_EOF: | |
136 | return "INDEX_EOF"; | |
137 | default: | |
138 | abort(); | |
139 | } | |
140 | } | |
141 | ||
28ab034a | 142 | static const char *lttng_viewer_attach_return_code_str(enum lttng_viewer_attach_return_code code) |
07d9fffa FD |
143 | { |
144 | switch (code) { | |
145 | case LTTNG_VIEWER_ATTACH_OK: | |
146 | return "ATTACH_OK"; | |
147 | case LTTNG_VIEWER_ATTACH_ALREADY: | |
148 | return "ATTACH_ALREADY"; | |
149 | case LTTNG_VIEWER_ATTACH_UNK: | |
150 | return "ATTACH_UNK"; | |
151 | case LTTNG_VIEWER_ATTACH_NOT_LIVE: | |
152 | return "ATTACH_NOT_LIVE"; | |
153 | case LTTNG_VIEWER_ATTACH_SEEK_ERR: | |
154 | return "ATTACH_SEEK_ERR"; | |
155 | case LTTNG_VIEWER_ATTACH_NO_SESSION: | |
156 | return "ATTACH_NO_SESSION"; | |
157 | default: | |
158 | abort(); | |
159 | } | |
160 | }; | |
161 | ||
28ab034a JG |
162 | static const char * |
163 | lttng_viewer_get_packet_return_code_str(enum lttng_viewer_get_packet_return_code code) | |
556d5fae FD |
164 | { |
165 | switch (code) { | |
166 | case LTTNG_VIEWER_GET_PACKET_OK: | |
167 | return "GET_PACKET_OK"; | |
168 | case LTTNG_VIEWER_GET_PACKET_RETRY: | |
169 | return "GET_PACKET_RETRY"; | |
170 | case LTTNG_VIEWER_GET_PACKET_ERR: | |
171 | return "GET_PACKET_ERR"; | |
172 | case LTTNG_VIEWER_GET_PACKET_EOF: | |
173 | return "GET_PACKET_EOF"; | |
174 | default: | |
175 | abort(); | |
176 | } | |
177 | }; | |
178 | ||
d3e2ba59 JD |
179 | /* |
180 | * Cleanup the daemon | |
181 | */ | |
cd9adb8b | 182 | static void cleanup_relayd_live() |
d3e2ba59 JD |
183 | { |
184 | DBG("Cleaning up"); | |
185 | ||
d3e2ba59 JD |
186 | free(live_uri); |
187 | } | |
188 | ||
2f8f53af DG |
189 | /* |
190 | * Receive a request buffer using a given socket, destination allocated buffer | |
191 | * of length size. | |
192 | * | |
193 | * Return the size of the received message or else a negative value on error | |
194 | * with errno being set by recvmsg() syscall. | |
195 | */ | |
28ab034a | 196 | static ssize_t recv_request(struct lttcomm_sock *sock, void *buf, size_t size) |
2f8f53af DG |
197 | { |
198 | ssize_t ret; | |
199 | ||
2f8f53af DG |
200 | ret = sock->ops->recvmsg(sock, buf, size, 0); |
201 | if (ret < 0 || ret != size) { | |
202 | if (ret == 0) { | |
203 | /* Orderly shutdown. Not necessary to print an error. */ | |
204 | DBG("Socket %d did an orderly shutdown", sock->fd); | |
205 | } else { | |
206 | ERR("Relay failed to receive request."); | |
207 | } | |
208 | ret = -1; | |
209 | } | |
210 | ||
211 | return ret; | |
212 | } | |
213 | ||
214 | /* | |
215 | * Send a response buffer using a given socket, source allocated buffer of | |
216 | * length size. | |
217 | * | |
218 | * Return the size of the sent message or else a negative value on error with | |
219 | * errno being set by sendmsg() syscall. | |
220 | */ | |
28ab034a | 221 | static ssize_t send_response(struct lttcomm_sock *sock, void *buf, size_t size) |
2f8f53af DG |
222 | { |
223 | ssize_t ret; | |
224 | ||
2f8f53af DG |
225 | ret = sock->ops->sendmsg(sock, buf, size, 0); |
226 | if (ret < 0) { | |
227 | ERR("Relayd failed to send response."); | |
228 | } | |
229 | ||
230 | return ret; | |
231 | } | |
232 | ||
233 | /* | |
f04a971b JD |
234 | * Atomically check if new streams got added in one of the sessions attached |
235 | * and reset the flag to 0. | |
2f8f53af DG |
236 | * |
237 | * Returns 1 if new streams got added, 0 if nothing changed, a negative value | |
238 | * on error. | |
239 | */ | |
28ab034a | 240 | static int check_new_streams(struct relay_connection *conn) |
2f8f53af | 241 | { |
f04a971b | 242 | int ret = 0; |
2f8f53af | 243 | |
f04a971b JD |
244 | if (!conn->viewer_session) { |
245 | goto end; | |
246 | } | |
56047f5a | 247 | |
a402293a JG |
248 | for (auto *session : |
249 | lttng::urcu::rcu_list_iteration_adapter<relay_session, | |
250 | &relay_session::viewer_session_node>( | |
251 | conn->viewer_session->session_list)) { | |
252 | if (!session_get(session)) { | |
253 | continue; | |
254 | } | |
283a96e4 | 255 | |
a402293a JG |
256 | ret = uatomic_read(&session->new_streams); |
257 | session_put(session); | |
258 | if (ret == 1) { | |
259 | goto end; | |
f04a971b | 260 | } |
2f8f53af | 261 | } |
283a96e4 | 262 | |
f04a971b | 263 | end: |
bb9f2140 JG |
264 | DBG("Viewer connection has%s new streams: socket_fd = %d", |
265 | ret == 0 ? " no" : "", | |
266 | conn->sock->fd); | |
2f8f53af DG |
267 | return ret; |
268 | } | |
269 | ||
98b82dfa KS |
270 | /* |
271 | * Sends one viewer stream to the given socket. | |
272 | * | |
273 | * This function needs to be called with the stream locked. | |
274 | * | |
275 | * Return 0 on success, or else a negative value. | |
276 | */ | |
277 | static ssize_t send_one_viewer_stream(struct lttcomm_sock *sock, | |
278 | struct relay_viewer_stream *vstream) | |
279 | { | |
280 | struct ctf_trace *ctf_trace; | |
281 | struct lttng_viewer_stream send_stream = {}; | |
282 | ssize_t ret = -1; | |
283 | ||
284 | ASSERT_LOCKED(vstream->stream->lock); | |
285 | ||
286 | ctf_trace = vstream->stream->trace; | |
287 | send_stream.id = htobe64(vstream->stream->stream_handle); | |
288 | send_stream.ctf_trace_id = htobe64(ctf_trace->id); | |
289 | send_stream.metadata_flag = htobe32(vstream->stream->is_metadata); | |
290 | if (lttng_strncpy( | |
291 | send_stream.path_name, vstream->path_name, sizeof(send_stream.path_name))) { | |
292 | ret = -1; /* Error. */ | |
293 | goto end; | |
294 | } | |
295 | if (lttng_strncpy(send_stream.channel_name, | |
296 | vstream->channel_name, | |
297 | sizeof(send_stream.channel_name))) { | |
298 | ret = -1; /* Error. */ | |
299 | goto end; | |
300 | } | |
301 | ||
302 | DBG("Sending stream %" PRIu64 " to viewer", vstream->stream->stream_handle); | |
303 | vstream->sent_flag = true; | |
304 | ||
305 | ret = send_response(sock, &send_stream, sizeof(send_stream)); | |
306 | if (ret < 0) { | |
307 | goto end; | |
308 | } | |
309 | ||
310 | ret = 0; | |
311 | ||
312 | end: | |
313 | return ret; | |
314 | } | |
315 | ||
2f8f53af DG |
316 | /* |
317 | * Send viewer streams to the given socket. The ignore_sent_flag indicates if | |
318 | * this function should ignore the sent flag or not. | |
319 | * | |
320 | * Return 0 on success or else a negative value. | |
321 | */ | |
98b82dfa KS |
322 | static ssize_t send_viewer_streams(struct lttcomm_sock *sock, |
323 | uint64_t session_id, | |
324 | unsigned int ignore_sent_flag, | |
325 | struct relay_viewer_session *viewer_session) | |
2f8f53af DG |
326 | { |
327 | ssize_t ret; | |
2f8f53af | 328 | |
d54688c6 JG |
329 | for (auto *vstream : |
330 | lttng::urcu::lfht_iteration_adapter<relay_viewer_stream, | |
331 | decltype(relay_viewer_stream::stream_n), | |
332 | &relay_viewer_stream::stream_n>( | |
333 | *viewer_streams_ht->ht)) { | |
d54688c6 | 334 | health_code_update(); |
2f8f53af | 335 | |
d54688c6 JG |
336 | if (!viewer_stream_get(vstream)) { |
337 | continue; | |
338 | } | |
2f8f53af | 339 | |
d54688c6 JG |
340 | pthread_mutex_lock(&vstream->stream->lock); |
341 | /* Ignore if not the same session. */ | |
342 | if (vstream->stream->trace->session->id != session_id || | |
343 | (!ignore_sent_flag && vstream->sent_flag)) { | |
56047f5a | 344 | pthread_mutex_unlock(&vstream->stream->lock); |
d54688c6 JG |
345 | viewer_stream_put(vstream); |
346 | continue; | |
347 | } | |
7591bab1 | 348 | |
98b82dfa KS |
349 | ret = send_one_viewer_stream(sock, vstream); |
350 | pthread_mutex_unlock(&vstream->stream->lock); | |
351 | if (ret < 0) { | |
56047f5a | 352 | viewer_stream_put(vstream); |
d54688c6 JG |
353 | goto end; |
354 | } | |
98b82dfa KS |
355 | |
356 | pthread_mutex_lock(&viewer_session->unannounced_stream_list_lock); | |
357 | cds_list_del_rcu(&vstream->viewer_stream_node); | |
358 | pthread_mutex_unlock(&viewer_session->unannounced_stream_list_lock); | |
359 | viewer_stream_put(vstream); | |
360 | } | |
361 | ||
362 | /* | |
363 | * Any remaining streams that have been seen, but are perhaps unpublished | |
364 | * due to a session being destroyed in between attach and get_new_streams. | |
365 | */ | |
7c8d0f41 JG |
366 | for (auto *vstream : |
367 | lttng::urcu::rcu_list_iteration_adapter<relay_viewer_stream, | |
368 | &relay_viewer_stream::viewer_stream_node>( | |
369 | viewer_session->unannounced_stream_list)) { | |
98b82dfa KS |
370 | health_code_update(); |
371 | if (!viewer_stream_get(vstream)) { | |
372 | continue; | |
373 | } | |
374 | ||
375 | pthread_mutex_lock(&vstream->stream->lock); | |
376 | if (vstream->stream->trace->session->id != session_id) { | |
d54688c6 JG |
377 | pthread_mutex_unlock(&vstream->stream->lock); |
378 | viewer_stream_put(vstream); | |
98b82dfa | 379 | continue; |
d54688c6 JG |
380 | } |
381 | ||
98b82dfa | 382 | ret = send_one_viewer_stream(sock, vstream); |
d54688c6 | 383 | pthread_mutex_unlock(&vstream->stream->lock); |
d54688c6 | 384 | if (ret < 0) { |
98b82dfa | 385 | viewer_stream_put(vstream); |
d54688c6 | 386 | goto end; |
2f8f53af | 387 | } |
98b82dfa KS |
388 | |
389 | pthread_mutex_lock(&viewer_session->unannounced_stream_list_lock); | |
390 | cds_list_del_rcu(&vstream->viewer_stream_node); | |
391 | viewer_stream_put(vstream); | |
392 | pthread_mutex_unlock(&viewer_session->unannounced_stream_list_lock); | |
393 | viewer_stream_put(vstream); | |
2f8f53af DG |
394 | } |
395 | ||
396 | ret = 0; | |
397 | ||
56047f5a | 398 | end: |
2f8f53af DG |
399 | return ret; |
400 | } | |
401 | ||
402 | /* | |
403 | * Create every viewer stream possible for the given session with the seek | |
404 | * type. Three counters *can* be return which are in order the total amount of | |
405 | * viewer stream of the session, the number of unsent stream and the number of | |
406 | * stream created. Those counters can be NULL and thus will be ignored. | |
407 | * | |
c06fdd95 JG |
408 | * session must be locked to ensure that we see either none or all initial |
409 | * streams for a session, but no intermediate state.. | |
410 | * | |
2f8f53af DG |
411 | * Return 0 on success or else a negative value. |
412 | */ | |
98b82dfa | 413 | int make_viewer_streams(struct relay_session *relay_session, |
7c8d0f41 JG |
414 | struct relay_viewer_session *viewer_session, |
415 | enum lttng_viewer_seek seek_t, | |
416 | unsigned int *nb_total, | |
417 | unsigned int *nb_unsent, | |
418 | unsigned int *nb_created, | |
419 | bool *closed) | |
2f8f53af DG |
420 | { |
421 | int ret; | |
2f8f53af | 422 | |
a0377dfe | 423 | LTTNG_ASSERT(relay_session); |
9edaf114 | 424 | ASSERT_LOCKED(relay_session->lock); |
2f8f53af | 425 | |
9edaf114 | 426 | if (relay_session->connection_closed) { |
bddf80e4 MD |
427 | *closed = true; |
428 | } | |
429 | ||
98b82dfa KS |
430 | /* |
431 | * Check unannounced viewer streams for any that have been seen but are no longer published. | |
432 | */ | |
7c8d0f41 JG |
433 | for (auto *viewer_stream : |
434 | lttng::urcu::rcu_list_iteration_adapter<relay_viewer_stream, | |
435 | &relay_viewer_stream::viewer_stream_node>( | |
436 | viewer_session->unannounced_stream_list)) { | |
98b82dfa KS |
437 | if (!viewer_stream_get(viewer_stream)) { |
438 | DBG("Couldn't get reference for viewer_stream"); | |
439 | continue; | |
440 | } | |
441 | ||
442 | if (viewer_stream->sent_flag) { | |
443 | ERR("logic error -> viewer stream %ld is in unannounced_stream_list is marked as sent", | |
444 | viewer_stream->stream->stream_handle); | |
445 | abort(); | |
446 | } | |
447 | ||
448 | if (viewer_stream->stream->published) { | |
449 | /* | |
450 | * This stream should be handled later when iterating via the | |
451 | * ctf_traces | |
452 | */ | |
453 | viewer_stream_put(viewer_stream); | |
454 | continue; | |
455 | } | |
456 | ||
457 | if (viewer_stream->stream->trace->session->id != relay_session->id) { | |
458 | viewer_stream_put(viewer_stream); | |
459 | continue; | |
460 | } | |
461 | ||
462 | if (nb_unsent) { | |
463 | (*nb_unsent)++; | |
464 | } | |
465 | ||
466 | if (nb_total) { | |
467 | (*nb_total)++; | |
468 | } | |
469 | ||
470 | viewer_stream_put(viewer_stream); | |
471 | } | |
472 | ||
2f8f53af | 473 | /* |
7591bab1 MD |
474 | * Create viewer streams for relay streams that are ready to be |
475 | * used for a the given session id only. | |
2f8f53af | 476 | */ |
a402293a | 477 | for (auto *raw_ctf_trace : lttng::urcu:: |
d54688c6 JG |
478 | lfht_iteration_adapter<ctf_trace, decltype(ctf_trace::node), &ctf_trace::node>( |
479 | *relay_session->ctf_traces_ht->ht)) { | |
480 | bool trace_has_metadata_stream = false; | |
2f8f53af | 481 | |
d54688c6 | 482 | health_code_update(); |
9edaf114 | 483 | |
a402293a | 484 | if (!ctf_trace_get(raw_ctf_trace)) { |
d54688c6 JG |
485 | continue; |
486 | } | |
9edaf114 | 487 | |
a402293a JG |
488 | auto ctf_trace = |
489 | lttng::make_unique_wrapper<struct ctf_trace, ctf_trace_put>(raw_ctf_trace); | |
98b82dfa KS |
490 | /* |
491 | * The trace metadata state may be updated while iterating over all the | |
492 | * relay streams associated with the trace, so the lock is required. | |
493 | */ | |
494 | const lttng::pthread::lock_guard ctf_trace_lock(ctf_trace->lock); | |
a402293a | 495 | |
d54688c6 JG |
496 | /* |
497 | * Iterate over all the streams of the trace to see if we have a | |
498 | * metadata stream. | |
499 | */ | |
a402293a JG |
500 | for (auto *stream : |
501 | lttng::urcu::rcu_list_iteration_adapter<relay_stream, | |
502 | &relay_stream::stream_node>( | |
503 | ctf_trace->stream_list)) { | |
d54688c6 | 504 | bool is_metadata_stream; |
123ed7c2 | 505 | |
a402293a JG |
506 | pthread_mutex_lock(&stream->lock); |
507 | is_metadata_stream = stream->is_metadata; | |
508 | pthread_mutex_unlock(&stream->lock); | |
d54688c6 JG |
509 | |
510 | if (is_metadata_stream) { | |
511 | trace_has_metadata_stream = true; | |
512 | break; | |
2a174661 | 513 | } |
d54688c6 | 514 | } |
9edaf114 | 515 | |
d54688c6 JG |
516 | /* |
517 | * If there is no metadata stream in this trace at the moment | |
518 | * and we never sent one to the viewer, skip the trace. We | |
519 | * accept that the viewer will not see this trace at all. | |
520 | */ | |
521 | if (!trace_has_metadata_stream && !ctf_trace->metadata_stream_sent_to_viewer) { | |
d54688c6 JG |
522 | continue; |
523 | } | |
524 | ||
a402293a JG |
525 | for (auto *raw_stream : |
526 | lttng::urcu::rcu_list_iteration_adapter<relay_stream, | |
527 | &relay_stream::stream_node>( | |
528 | ctf_trace->stream_list)) { | |
d54688c6 JG |
529 | struct relay_viewer_stream *viewer_stream; |
530 | ||
a402293a | 531 | if (!stream_get(raw_stream)) { |
56047f5a | 532 | continue; |
7591bab1 | 533 | } |
9edaf114 | 534 | |
a402293a JG |
535 | auto stream = |
536 | lttng::make_unique_wrapper<relay_stream, stream_put>(raw_stream); | |
537 | raw_stream = nullptr; | |
538 | ||
539 | const lttng::pthread::lock_guard stream_lock(stream->lock); | |
d54688c6 JG |
540 | /* |
541 | * stream published is protected by the session lock. | |
542 | */ | |
a402293a JG |
543 | if (!stream->published) { |
544 | continue; | |
d54688c6 | 545 | } |
a402293a | 546 | viewer_stream = viewer_stream_get_by_id(stream->stream_handle); |
d54688c6 JG |
547 | if (!viewer_stream) { |
548 | struct lttng_trace_chunk *viewer_stream_trace_chunk = nullptr; | |
9edaf114 JG |
549 | |
550 | /* | |
d54688c6 JG |
551 | * Save that we sent the metadata stream to the |
552 | * viewer. So that we know what trace the viewer | |
553 | * is aware of. | |
9edaf114 | 554 | */ |
a402293a | 555 | if (stream->is_metadata) { |
d54688c6 | 556 | ctf_trace->metadata_stream_sent_to_viewer = true; |
56047f5a | 557 | } |
56047f5a | 558 | |
d54688c6 JG |
559 | /* |
560 | * If a rotation is ongoing, use a copy of the | |
561 | * relay stream's chunk to ensure the stream | |
562 | * files exist. | |
563 | * | |
564 | * Otherwise, the viewer session's current trace | |
565 | * chunk can be used safely. | |
566 | */ | |
a402293a | 567 | if ((stream->ongoing_rotation.is_set || |
d54688c6 | 568 | session_has_ongoing_rotation(relay_session)) && |
a402293a | 569 | stream->trace_chunk) { |
d54688c6 | 570 | viewer_stream_trace_chunk = |
a402293a | 571 | lttng_trace_chunk_copy(stream->trace_chunk); |
d54688c6 JG |
572 | if (!viewer_stream_trace_chunk) { |
573 | ret = -1; | |
a402293a | 574 | goto end; |
9edaf114 | 575 | } |
d54688c6 | 576 | } else { |
80516611 | 577 | /* |
d54688c6 JG |
578 | * Transition the viewer session into the newest |
579 | * trace chunk available. | |
80516611 | 580 | */ |
d54688c6 JG |
581 | if (!lttng_trace_chunk_ids_equal( |
582 | viewer_session->current_trace_chunk, | |
a402293a | 583 | stream->trace_chunk)) { |
d54688c6 | 584 | ret = viewer_session_set_trace_chunk_copy( |
a402293a | 585 | viewer_session, stream->trace_chunk); |
d54688c6 | 586 | if (ret) { |
80516611 | 587 | ret = -1; |
a402293a | 588 | goto end; |
80516611 | 589 | } |
d54688c6 JG |
590 | } |
591 | ||
a402293a | 592 | if (stream->trace_chunk) { |
87250ba1 | 593 | /* |
d54688c6 JG |
594 | * If the corresponding relay |
595 | * stream's trace chunk is set, | |
596 | * the viewer stream will be | |
597 | * created under it. | |
598 | * | |
599 | * Note that a relay stream can | |
600 | * have a NULL output trace | |
601 | * chunk (for instance, after a | |
602 | * clear against a stopped | |
603 | * session). | |
87250ba1 | 604 | */ |
d54688c6 JG |
605 | const bool reference_acquired = |
606 | lttng_trace_chunk_get( | |
607 | viewer_session->current_trace_chunk); | |
87250ba1 | 608 | |
d54688c6 JG |
609 | LTTNG_ASSERT(reference_acquired); |
610 | viewer_stream_trace_chunk = | |
611 | viewer_session->current_trace_chunk; | |
87250ba1 | 612 | } |
d54688c6 | 613 | } |
9edaf114 | 614 | |
d54688c6 | 615 | viewer_stream = viewer_stream_create( |
a402293a | 616 | stream.get(), viewer_stream_trace_chunk, seek_t); |
d54688c6 JG |
617 | lttng_trace_chunk_put(viewer_stream_trace_chunk); |
618 | viewer_stream_trace_chunk = nullptr; | |
619 | if (!viewer_stream) { | |
620 | ret = -1; | |
a402293a | 621 | goto end; |
d54688c6 | 622 | } |
2a174661 | 623 | |
98b82dfa KS |
624 | /* |
625 | * Add the new stream to the list of streams to publish for | |
626 | * this session. | |
627 | */ | |
7c8d0f41 | 628 | pthread_mutex_lock(&viewer_session->unannounced_stream_list_lock); |
98b82dfa KS |
629 | cds_list_add_rcu(&viewer_stream->viewer_stream_node, |
630 | &viewer_session->unannounced_stream_list); | |
7c8d0f41 | 631 | pthread_mutex_unlock(&viewer_session->unannounced_stream_list_lock); |
98b82dfa KS |
632 | /* |
633 | * Get for the unannounced stream list, this should be | |
634 | * put when the unannounced stream is sent. | |
635 | */ | |
636 | if (!viewer_stream_get(viewer_stream)) { | |
637 | ERR("Unable to get self-reference on viewer stream"); | |
638 | abort(); | |
639 | } | |
640 | ||
d54688c6 JG |
641 | if (nb_created) { |
642 | /* Update number of created stream counter. */ | |
643 | (*nb_created)++; | |
644 | } | |
645 | /* | |
646 | * Ensure a self-reference is preserved even | |
647 | * after we have put our local reference. | |
648 | */ | |
649 | if (!viewer_stream_get(viewer_stream)) { | |
650 | ERR("Unable to get self-reference on viewer stream, logic error."); | |
651 | abort(); | |
652 | } | |
653 | } else { | |
654 | if (!viewer_stream->sent_flag && nb_unsent) { | |
655 | /* Update number of unsent stream counter. */ | |
656 | (*nb_unsent)++; | |
657 | } | |
658 | } | |
659 | /* Update number of total stream counter. */ | |
660 | if (nb_total) { | |
7c8d0f41 | 661 | if (stream->is_metadata) { |
a402293a JG |
662 | if (!stream->closed || |
663 | stream->metadata_received > | |
d54688c6 JG |
664 | viewer_stream->metadata_sent) { |
665 | (*nb_total)++; | |
2229a09c MD |
666 | } |
667 | } else { | |
a402293a JG |
668 | if (!stream->closed || |
669 | !(((int64_t) (stream->prev_data_seq - | |
670 | stream->last_net_seq_num)) >= 0)) { | |
d54688c6 | 671 | (*nb_total)++; |
56047f5a JG |
672 | } |
673 | } | |
2f8f53af | 674 | } |
d54688c6 JG |
675 | /* Put local reference. */ |
676 | viewer_stream_put(viewer_stream); | |
2f8f53af DG |
677 | } |
678 | } | |
679 | ||
680 | ret = 0; | |
681 | ||
a402293a | 682 | end: |
2f8f53af DG |
683 | return ret; |
684 | } | |
685 | ||
cd9adb8b | 686 | int relayd_live_stop() |
d3e2ba59 | 687 | { |
b4aacfdc | 688 | /* Stop dispatch thread */ |
d3e2ba59 | 689 | CMM_STORE_SHARED(live_dispatch_thread_exit, 1); |
58eb9381 | 690 | futex_nto1_wake(&viewer_conn_queue.futex); |
b4aacfdc | 691 | return 0; |
d3e2ba59 JD |
692 | } |
693 | ||
28ab034a | 694 | static int create_sock(void *data, int *out_fd) |
8855795d JG |
695 | { |
696 | int ret; | |
ac497a37 | 697 | struct lttcomm_sock *sock = (lttcomm_sock *) data; |
8855795d JG |
698 | |
699 | ret = lttcomm_create_sock(sock); | |
700 | if (ret < 0) { | |
701 | goto end; | |
702 | } | |
703 | ||
704 | *out_fd = sock->fd; | |
705 | end: | |
706 | return ret; | |
707 | } | |
708 | ||
28ab034a | 709 | static int close_sock(void *data, int *in_fd __attribute__((unused))) |
8855795d | 710 | { |
ac497a37 | 711 | struct lttcomm_sock *sock = (lttcomm_sock *) data; |
8855795d JG |
712 | |
713 | return sock->ops->close(sock); | |
714 | } | |
715 | ||
29555a78 JG |
716 | static int accept_sock(void *data, int *out_fd) |
717 | { | |
718 | int ret = 0; | |
719 | /* Socks is an array of in_sock, out_sock. */ | |
ac497a37 | 720 | struct lttcomm_sock **socks = (lttcomm_sock **) data; |
29555a78 JG |
721 | struct lttcomm_sock *in_sock = socks[0]; |
722 | ||
723 | socks[1] = in_sock->ops->accept(in_sock); | |
724 | if (!socks[1]) { | |
725 | ret = -1; | |
726 | goto end; | |
727 | } | |
728 | *out_fd = socks[1]->fd; | |
729 | end: | |
730 | return ret; | |
731 | } | |
732 | ||
28ab034a | 733 | static struct lttcomm_sock *accept_live_sock(struct lttcomm_sock *listening_sock, const char *name) |
29555a78 JG |
734 | { |
735 | int out_fd, ret; | |
cd9adb8b JG |
736 | struct lttcomm_sock *socks[2] = { listening_sock, nullptr }; |
737 | struct lttcomm_sock *new_sock = nullptr; | |
29555a78 | 738 | |
28ab034a JG |
739 | ret = fd_tracker_open_unsuspendable_fd( |
740 | the_fd_tracker, &out_fd, (const char **) &name, 1, accept_sock, &socks); | |
29555a78 JG |
741 | if (ret) { |
742 | goto end; | |
743 | } | |
744 | new_sock = socks[1]; | |
745 | DBG("%s accepted, socket %d", name, new_sock->fd); | |
746 | end: | |
747 | return new_sock; | |
748 | } | |
749 | ||
d3e2ba59 JD |
750 | /* |
751 | * Create and init socket from uri. | |
752 | */ | |
28ab034a | 753 | static struct lttcomm_sock *init_socket(struct lttng_uri *uri, const char *name) |
d3e2ba59 | 754 | { |
8855795d | 755 | int ret, sock_fd; |
cd9adb8b | 756 | struct lttcomm_sock *sock = nullptr; |
8855795d | 757 | char uri_str[LTTNG_PATH_MAX]; |
cd9adb8b | 758 | char *formated_name = nullptr; |
d3e2ba59 JD |
759 | |
760 | sock = lttcomm_alloc_sock_from_uri(uri); | |
cd9adb8b | 761 | if (sock == nullptr) { |
d3e2ba59 JD |
762 | ERR("Allocating socket"); |
763 | goto error; | |
764 | } | |
765 | ||
8855795d JG |
766 | /* |
767 | * Don't fail to create the socket if the name can't be built as it is | |
768 | * only used for debugging purposes. | |
769 | */ | |
770 | ret = uri_to_str_url(uri, uri_str, sizeof(uri_str)); | |
771 | uri_str[sizeof(uri_str) - 1] = '\0'; | |
772 | if (ret >= 0) { | |
28ab034a | 773 | ret = asprintf(&formated_name, "%s socket @ %s", name, uri_str); |
8855795d | 774 | if (ret < 0) { |
cd9adb8b | 775 | formated_name = nullptr; |
8855795d | 776 | } |
d3e2ba59 | 777 | } |
8855795d | 778 | |
28ab034a JG |
779 | ret = fd_tracker_open_unsuspendable_fd(the_fd_tracker, |
780 | &sock_fd, | |
781 | (const char **) (formated_name ? &formated_name : | |
cd9adb8b | 782 | nullptr), |
28ab034a JG |
783 | 1, |
784 | create_sock, | |
785 | sock); | |
d546eeec | 786 | if (ret) { |
28ab034a | 787 | PERROR("Failed to create \"%s\" socket", formated_name ?: "Unknown"); |
d546eeec JG |
788 | goto error; |
789 | } | |
8855795d | 790 | DBG("Listening on %s socket %d", name, sock->fd); |
d3e2ba59 JD |
791 | |
792 | ret = sock->ops->bind(sock); | |
793 | if (ret < 0) { | |
2288467f | 794 | PERROR("Failed to bind lttng-live socket"); |
d3e2ba59 JD |
795 | goto error; |
796 | } | |
797 | ||
798 | ret = sock->ops->listen(sock, -1); | |
799 | if (ret < 0) { | |
800 | goto error; | |
d3e2ba59 JD |
801 | } |
802 | ||
d546eeec | 803 | free(formated_name); |
d3e2ba59 JD |
804 | return sock; |
805 | ||
806 | error: | |
807 | if (sock) { | |
808 | lttcomm_destroy_sock(sock); | |
809 | } | |
d546eeec | 810 | free(formated_name); |
cd9adb8b | 811 | return nullptr; |
d3e2ba59 JD |
812 | } |
813 | ||
814 | /* | |
815 | * This thread manages the listening for new connections on the network | |
816 | */ | |
28ab034a | 817 | static void *thread_listener(void *data __attribute__((unused))) |
d3e2ba59 | 818 | { |
8a00688e MJ |
819 | int i, ret, err = -1; |
820 | uint32_t nb_fd; | |
d3e2ba59 JD |
821 | struct lttng_poll_event events; |
822 | struct lttcomm_sock *live_control_sock; | |
823 | ||
824 | DBG("[thread] Relay live listener started"); | |
825 | ||
8fba2b8d | 826 | rcu_register_thread(); |
eea7556c MD |
827 | health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_LISTENER); |
828 | ||
829 | health_code_update(); | |
830 | ||
8855795d | 831 | live_control_sock = init_socket(live_uri, "Live listener"); |
d3e2ba59 JD |
832 | if (!live_control_sock) { |
833 | goto error_sock_control; | |
834 | } | |
835 | ||
fb4d42ab | 836 | /* Pass 2 as size here for the thread quit pipe and control sockets. */ |
28ab034a | 837 | ret = create_named_thread_poll_set(&events, 2, "Live listener thread epoll"); |
d3e2ba59 JD |
838 | if (ret < 0) { |
839 | goto error_create_poll; | |
840 | } | |
841 | ||
842 | /* Add the control socket */ | |
843 | ret = lttng_poll_add(&events, live_control_sock->fd, LPOLLIN | LPOLLRDHUP); | |
844 | if (ret < 0) { | |
845 | goto error_poll_add; | |
846 | } | |
847 | ||
3fd27398 MD |
848 | lttng_relay_notify_ready(); |
849 | ||
9b5e0863 MD |
850 | if (testpoint(relayd_thread_live_listener)) { |
851 | goto error_testpoint; | |
852 | } | |
853 | ||
cd9adb8b | 854 | while (true) { |
eea7556c MD |
855 | health_code_update(); |
856 | ||
d3e2ba59 JD |
857 | DBG("Listener accepting live viewers connections"); |
858 | ||
28ab034a | 859 | restart: |
eea7556c | 860 | health_poll_entry(); |
d3e2ba59 | 861 | ret = lttng_poll_wait(&events, -1); |
eea7556c | 862 | health_poll_exit(); |
d3e2ba59 JD |
863 | if (ret < 0) { |
864 | /* | |
865 | * Restart interrupted system call. | |
866 | */ | |
867 | if (errno == EINTR) { | |
868 | goto restart; | |
869 | } | |
870 | goto error; | |
871 | } | |
872 | nb_fd = ret; | |
873 | ||
874 | DBG("Relay new viewer connection received"); | |
875 | for (i = 0; i < nb_fd; i++) { | |
876 | /* Fetch once the poll data */ | |
8a00688e MJ |
877 | const auto revents = LTTNG_POLL_GETEV(&events, i); |
878 | const auto pollfd = LTTNG_POLL_GETFD(&events, i); | |
879 | ||
880 | health_code_update(); | |
d3e2ba59 | 881 | |
8a00688e MJ |
882 | /* Activity on thread quit pipe, exiting. */ |
883 | if (relayd_is_thread_quit_pipe(pollfd)) { | |
884 | DBG("Activity on thread quit pipe"); | |
d3e2ba59 JD |
885 | err = 0; |
886 | goto exit; | |
887 | } | |
888 | ||
03e43155 | 889 | if (revents & LPOLLIN) { |
d3e2ba59 | 890 | /* |
7591bab1 MD |
891 | * A new connection is requested, therefore a |
892 | * viewer connection is allocated in this | |
893 | * thread, enqueued to a global queue and | |
894 | * dequeued (and freed) in the worker thread. | |
d3e2ba59 | 895 | */ |
58eb9381 DG |
896 | int val = 1; |
897 | struct relay_connection *new_conn; | |
d3e2ba59 JD |
898 | struct lttcomm_sock *newsock; |
899 | ||
29555a78 | 900 | newsock = accept_live_sock(live_control_sock, |
28ab034a | 901 | "Live socket to client"); |
d3e2ba59 JD |
902 | if (!newsock) { |
903 | PERROR("accepting control sock"); | |
d3e2ba59 JD |
904 | goto error; |
905 | } | |
906 | DBG("Relay viewer connection accepted socket %d", newsock->fd); | |
58eb9381 | 907 | |
28ab034a JG |
908 | ret = setsockopt( |
909 | newsock->fd, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val)); | |
d3e2ba59 JD |
910 | if (ret < 0) { |
911 | PERROR("setsockopt inet"); | |
912 | lttcomm_destroy_sock(newsock); | |
d3e2ba59 JD |
913 | goto error; |
914 | } | |
7591bab1 MD |
915 | new_conn = connection_create(newsock, RELAY_CONNECTION_UNKNOWN); |
916 | if (!new_conn) { | |
917 | lttcomm_destroy_sock(newsock); | |
918 | goto error; | |
919 | } | |
920 | /* Ownership assumed by the connection. */ | |
cd9adb8b | 921 | newsock = nullptr; |
d3e2ba59 | 922 | |
58eb9381 | 923 | /* Enqueue request for the dispatcher thread. */ |
ac497a37 SM |
924 | cds_wfcq_head_ptr_t head; |
925 | head.h = &viewer_conn_queue.head; | |
28ab034a | 926 | cds_wfcq_enqueue(head, &viewer_conn_queue.tail, &new_conn->qnode); |
d3e2ba59 JD |
927 | |
928 | /* | |
7591bab1 MD |
929 | * Wake the dispatch queue futex. |
930 | * Implicit memory barrier with the | |
931 | * exchange in cds_wfcq_enqueue. | |
d3e2ba59 | 932 | */ |
58eb9381 | 933 | futex_nto1_wake(&viewer_conn_queue.futex); |
03e43155 MD |
934 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
935 | ERR("socket poll error"); | |
936 | goto error; | |
937 | } else { | |
938 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
939 | goto error; | |
d3e2ba59 JD |
940 | } |
941 | } | |
942 | } | |
943 | ||
944 | exit: | |
945 | error: | |
946 | error_poll_add: | |
9b5e0863 | 947 | error_testpoint: |
23f940ff | 948 | (void) fd_tracker_util_poll_clean(the_fd_tracker, &events); |
d3e2ba59 JD |
949 | error_create_poll: |
950 | if (live_control_sock->fd >= 0) { | |
8855795d JG |
951 | int sock_fd = live_control_sock->fd; |
952 | ||
28ab034a JG |
953 | ret = fd_tracker_close_unsuspendable_fd( |
954 | the_fd_tracker, &sock_fd, 1, close_sock, live_control_sock); | |
d3e2ba59 JD |
955 | if (ret) { |
956 | PERROR("close"); | |
957 | } | |
8855795d | 958 | live_control_sock->fd = -1; |
d3e2ba59 JD |
959 | } |
960 | lttcomm_destroy_sock(live_control_sock); | |
961 | error_sock_control: | |
962 | if (err) { | |
eea7556c | 963 | health_error(); |
d3e2ba59 JD |
964 | DBG("Live viewer listener thread exited with error"); |
965 | } | |
eea7556c | 966 | health_unregister(health_relayd); |
8fba2b8d | 967 | rcu_unregister_thread(); |
d3e2ba59 | 968 | DBG("Live viewer listener thread cleanup complete"); |
b4aacfdc MD |
969 | if (lttng_relay_stop_threads()) { |
970 | ERR("Error stopping threads"); | |
178a0557 | 971 | } |
cd9adb8b | 972 | return nullptr; |
d3e2ba59 JD |
973 | } |
974 | ||
975 | /* | |
976 | * This thread manages the dispatching of the requests to worker threads | |
977 | */ | |
28ab034a | 978 | static void *thread_dispatcher(void *data __attribute__((unused))) |
d3e2ba59 | 979 | { |
6cd525e8 MD |
980 | int err = -1; |
981 | ssize_t ret; | |
8bdee6e2 | 982 | struct cds_wfcq_node *node; |
cd9adb8b | 983 | struct relay_connection *conn = nullptr; |
d3e2ba59 JD |
984 | |
985 | DBG("[thread] Live viewer relay dispatcher started"); | |
986 | ||
eea7556c MD |
987 | health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_DISPATCHER); |
988 | ||
9b5e0863 MD |
989 | if (testpoint(relayd_thread_live_dispatcher)) { |
990 | goto error_testpoint; | |
991 | } | |
992 | ||
eea7556c MD |
993 | health_code_update(); |
994 | ||
0ed3b1a8 | 995 | for (;;) { |
eea7556c MD |
996 | health_code_update(); |
997 | ||
d3e2ba59 | 998 | /* Atomically prepare the queue futex */ |
58eb9381 | 999 | futex_nto1_prepare(&viewer_conn_queue.futex); |
d3e2ba59 | 1000 | |
0ed3b1a8 MD |
1001 | if (CMM_LOAD_SHARED(live_dispatch_thread_exit)) { |
1002 | break; | |
1003 | } | |
1004 | ||
d3e2ba59 | 1005 | do { |
eea7556c MD |
1006 | health_code_update(); |
1007 | ||
d3e2ba59 | 1008 | /* Dequeue commands */ |
8bdee6e2 SM |
1009 | node = cds_wfcq_dequeue_blocking(&viewer_conn_queue.head, |
1010 | &viewer_conn_queue.tail); | |
cd9adb8b | 1011 | if (node == nullptr) { |
d3e2ba59 | 1012 | DBG("Woken up but nothing in the live-viewer " |
28ab034a | 1013 | "relay command queue"); |
d3e2ba59 JD |
1014 | /* Continue thread execution */ |
1015 | break; | |
1016 | } | |
0114db0e | 1017 | conn = lttng::utils::container_of(node, &relay_connection::qnode); |
28ab034a | 1018 | DBG("Dispatching viewer request waiting on sock %d", conn->sock->fd); |
d3e2ba59 JD |
1019 | |
1020 | /* | |
7591bab1 MD |
1021 | * Inform worker thread of the new request. This |
1022 | * call is blocking so we can be assured that | |
1023 | * the data will be read at some point in time | |
1024 | * or wait to the end of the world :) | |
d3e2ba59 | 1025 | */ |
5c7248cd JG |
1026 | ret = lttng_write(live_conn_pipe[1], &conn, sizeof(conn)); /* NOLINT sizeof |
1027 | used on a | |
1028 | pointer. */ | |
58eb9381 DG |
1029 | if (ret < 0) { |
1030 | PERROR("write conn pipe"); | |
7591bab1 | 1031 | connection_put(conn); |
d3e2ba59 JD |
1032 | goto error; |
1033 | } | |
cd9adb8b | 1034 | } while (node != nullptr); |
d3e2ba59 JD |
1035 | |
1036 | /* Futex wait on queue. Blocking call on futex() */ | |
eea7556c | 1037 | health_poll_entry(); |
58eb9381 | 1038 | futex_nto1_wait(&viewer_conn_queue.futex); |
eea7556c | 1039 | health_poll_exit(); |
d3e2ba59 JD |
1040 | } |
1041 | ||
eea7556c MD |
1042 | /* Normal exit, no error */ |
1043 | err = 0; | |
1044 | ||
d3e2ba59 | 1045 | error: |
9b5e0863 | 1046 | error_testpoint: |
eea7556c MD |
1047 | if (err) { |
1048 | health_error(); | |
1049 | ERR("Health error occurred in %s", __func__); | |
1050 | } | |
1051 | health_unregister(health_relayd); | |
d3e2ba59 | 1052 | DBG("Live viewer dispatch thread dying"); |
b4aacfdc MD |
1053 | if (lttng_relay_stop_threads()) { |
1054 | ERR("Error stopping threads"); | |
178a0557 | 1055 | } |
cd9adb8b | 1056 | return nullptr; |
d3e2ba59 JD |
1057 | } |
1058 | ||
1059 | /* | |
1060 | * Establish connection with the viewer and check the versions. | |
1061 | * | |
1062 | * Return 0 on success or else negative value. | |
1063 | */ | |
28ab034a | 1064 | static int viewer_connect(struct relay_connection *conn) |
d3e2ba59 JD |
1065 | { |
1066 | int ret; | |
1067 | struct lttng_viewer_connect reply, msg; | |
1068 | ||
cd9adb8b | 1069 | conn->version_check_done = true; |
d3e2ba59 | 1070 | |
eea7556c MD |
1071 | health_code_update(); |
1072 | ||
58eb9381 | 1073 | ret = recv_request(conn->sock, &msg, sizeof(msg)); |
2f8f53af | 1074 | if (ret < 0) { |
d3e2ba59 JD |
1075 | goto end; |
1076 | } | |
1077 | ||
eea7556c MD |
1078 | health_code_update(); |
1079 | ||
f46b2ce6 | 1080 | memset(&reply, 0, sizeof(reply)); |
d3e2ba59 JD |
1081 | reply.major = RELAYD_VERSION_COMM_MAJOR; |
1082 | reply.minor = RELAYD_VERSION_COMM_MINOR; | |
1083 | ||
1084 | /* Major versions must be the same */ | |
1085 | if (reply.major != be32toh(msg.major)) { | |
2f8f53af | 1086 | DBG("Incompatible major versions ([relayd] %u vs [client] %u)", |
28ab034a JG |
1087 | reply.major, |
1088 | be32toh(msg.major)); | |
72180669 | 1089 | ret = -1; |
d3e2ba59 JD |
1090 | goto end; |
1091 | } | |
1092 | ||
58eb9381 | 1093 | conn->major = reply.major; |
d3e2ba59 JD |
1094 | /* We adapt to the lowest compatible version */ |
1095 | if (reply.minor <= be32toh(msg.minor)) { | |
58eb9381 | 1096 | conn->minor = reply.minor; |
d3e2ba59 | 1097 | } else { |
58eb9381 | 1098 | conn->minor = be32toh(msg.minor); |
d3e2ba59 JD |
1099 | } |
1100 | ||
c4e361a4 | 1101 | if (be32toh(msg.type) == LTTNG_VIEWER_CLIENT_COMMAND) { |
58eb9381 | 1102 | conn->type = RELAY_VIEWER_COMMAND; |
c4e361a4 | 1103 | } else if (be32toh(msg.type) == LTTNG_VIEWER_CLIENT_NOTIFICATION) { |
58eb9381 | 1104 | conn->type = RELAY_VIEWER_NOTIFICATION; |
d3e2ba59 JD |
1105 | } else { |
1106 | ERR("Unknown connection type : %u", be32toh(msg.type)); | |
1107 | ret = -1; | |
1108 | goto end; | |
1109 | } | |
1110 | ||
1111 | reply.major = htobe32(reply.major); | |
1112 | reply.minor = htobe32(reply.minor); | |
58eb9381 | 1113 | if (conn->type == RELAY_VIEWER_COMMAND) { |
93b4787b | 1114 | /* |
7591bab1 MD |
1115 | * Increment outside of htobe64 macro, because the argument can |
1116 | * be used more than once within the macro, and thus the | |
1117 | * operation may be undefined. | |
93b4787b | 1118 | */ |
7591bab1 | 1119 | pthread_mutex_lock(&last_relay_viewer_session_id_lock); |
93b4787b | 1120 | last_relay_viewer_session_id++; |
7591bab1 | 1121 | pthread_mutex_unlock(&last_relay_viewer_session_id_lock); |
93b4787b | 1122 | reply.viewer_session_id = htobe64(last_relay_viewer_session_id); |
d3e2ba59 | 1123 | } |
eea7556c MD |
1124 | |
1125 | health_code_update(); | |
1126 | ||
58eb9381 | 1127 | ret = send_response(conn->sock, &reply, sizeof(reply)); |
d3e2ba59 | 1128 | if (ret < 0) { |
2f8f53af | 1129 | goto end; |
d3e2ba59 JD |
1130 | } |
1131 | ||
eea7556c MD |
1132 | health_code_update(); |
1133 | ||
58eb9381 | 1134 | DBG("Version check done using protocol %u.%u", conn->major, conn->minor); |
d3e2ba59 JD |
1135 | ret = 0; |
1136 | ||
1137 | end: | |
1138 | return ret; | |
1139 | } | |
1140 | ||
1141 | /* | |
1142 | * Send the viewer the list of current sessions. | |
7591bab1 MD |
1143 | * We need to create a copy of the hash table content because otherwise |
1144 | * we cannot assume the number of entries stays the same between getting | |
1145 | * the number of HT elements and iteration over the HT. | |
d3e2ba59 JD |
1146 | * |
1147 | * Return 0 on success or else a negative value. | |
1148 | */ | |
28ab034a | 1149 | static int viewer_list_sessions(struct relay_connection *conn) |
d3e2ba59 | 1150 | { |
5f10c6b1 | 1151 | int ret = 0; |
d3e2ba59 | 1152 | struct lttng_viewer_list_sessions session_list; |
cd9adb8b | 1153 | struct lttng_viewer_session *send_session_buf = nullptr; |
7591bab1 MD |
1154 | uint32_t buf_count = SESSION_BUF_DEFAULT_COUNT; |
1155 | uint32_t count = 0; | |
d3e2ba59 | 1156 | |
64803277 | 1157 | send_session_buf = calloc<lttng_viewer_session>(SESSION_BUF_DEFAULT_COUNT); |
7591bab1 MD |
1158 | if (!send_session_buf) { |
1159 | return -1; | |
d3e2ba59 JD |
1160 | } |
1161 | ||
d54688c6 JG |
1162 | for (auto *session : |
1163 | lttng::urcu::lfht_iteration_adapter<relay_session, | |
1164 | decltype(relay_session::session_n), | |
1165 | &relay_session::session_n>(*sessions_ht->ht)) { | |
1166 | struct lttng_viewer_session *send_session; | |
d3e2ba59 | 1167 | |
d54688c6 | 1168 | health_code_update(); |
56047f5a | 1169 | |
d54688c6 JG |
1170 | pthread_mutex_lock(&session->lock); |
1171 | if (session->connection_closed) { | |
1172 | /* Skip closed session */ | |
1173 | goto next_session; | |
1174 | } | |
7e0a4379 | 1175 | |
d54688c6 JG |
1176 | if (count >= buf_count) { |
1177 | struct lttng_viewer_session *newbuf; | |
1178 | const uint32_t new_buf_count = buf_count << 1; | |
eea7556c | 1179 | |
d54688c6 JG |
1180 | newbuf = (lttng_viewer_session *) realloc( |
1181 | send_session_buf, new_buf_count * sizeof(*send_session_buf)); | |
1182 | if (!newbuf) { | |
56047f5a JG |
1183 | ret = -1; |
1184 | goto break_loop; | |
1185 | } | |
d54688c6 JG |
1186 | send_session_buf = newbuf; |
1187 | buf_count = new_buf_count; | |
1188 | } | |
1189 | send_session = &send_session_buf[count]; | |
1190 | if (lttng_strncpy(send_session->session_name, | |
1191 | session->session_name, | |
1192 | sizeof(send_session->session_name))) { | |
1193 | ret = -1; | |
1194 | goto break_loop; | |
1195 | } | |
1196 | if (lttng_strncpy(send_session->hostname, | |
1197 | session->hostname, | |
1198 | sizeof(send_session->hostname))) { | |
1199 | ret = -1; | |
1200 | goto break_loop; | |
d227d5bd | 1201 | } |
d54688c6 JG |
1202 | send_session->id = htobe64(session->id); |
1203 | send_session->live_timer = htobe32(session->live_timer); | |
1204 | if (session->viewer_attached) { | |
1205 | send_session->clients = htobe32(1); | |
1206 | } else { | |
1207 | send_session->clients = htobe32(0); | |
1208 | } | |
1209 | send_session->streams = htobe32(session->stream_count); | |
1210 | count++; | |
1211 | next_session: | |
1212 | pthread_mutex_unlock(&session->lock); | |
1213 | continue; | |
1214 | break_loop: | |
1215 | pthread_mutex_unlock(&session->lock); | |
1216 | break; | |
7591bab1 | 1217 | } |
56047f5a | 1218 | |
5f10c6b1 JG |
1219 | if (ret < 0) { |
1220 | goto end_free; | |
1221 | } | |
d227d5bd | 1222 | |
7591bab1 | 1223 | session_list.sessions_count = htobe32(count); |
d227d5bd | 1224 | |
7591bab1 | 1225 | health_code_update(); |
d227d5bd | 1226 | |
7591bab1 MD |
1227 | ret = send_response(conn->sock, &session_list, sizeof(session_list)); |
1228 | if (ret < 0) { | |
1229 | goto end_free; | |
d227d5bd | 1230 | } |
d227d5bd | 1231 | |
7591bab1 | 1232 | health_code_update(); |
d227d5bd | 1233 | |
28ab034a | 1234 | ret = send_response(conn->sock, send_session_buf, count * sizeof(*send_session_buf)); |
7591bab1 MD |
1235 | if (ret < 0) { |
1236 | goto end_free; | |
d227d5bd | 1237 | } |
7591bab1 | 1238 | health_code_update(); |
d227d5bd | 1239 | |
7591bab1 MD |
1240 | ret = 0; |
1241 | end_free: | |
1242 | free(send_session_buf); | |
1243 | return ret; | |
d227d5bd JD |
1244 | } |
1245 | ||
80e8027a | 1246 | /* |
7591bab1 | 1247 | * Send the viewer the list of current streams. |
80e8027a | 1248 | */ |
28ab034a | 1249 | static int viewer_get_new_streams(struct relay_connection *conn) |
80e8027a JD |
1250 | { |
1251 | int ret, send_streams = 0; | |
98b82dfa | 1252 | unsigned int nb_created = 0, nb_unsent = 0, nb_streams = 0, nb_total = 0; |
80e8027a JD |
1253 | struct lttng_viewer_new_streams_request request; |
1254 | struct lttng_viewer_new_streams_response response; | |
cd9adb8b | 1255 | struct relay_session *session = nullptr; |
6763619c | 1256 | uint64_t session_id; |
bddf80e4 | 1257 | bool closed = false; |
80e8027a | 1258 | |
a0377dfe | 1259 | LTTNG_ASSERT(conn); |
80e8027a | 1260 | |
80e8027a JD |
1261 | health_code_update(); |
1262 | ||
2f8f53af | 1263 | /* Receive the request from the connected client. */ |
58eb9381 | 1264 | ret = recv_request(conn->sock, &request, sizeof(request)); |
2f8f53af | 1265 | if (ret < 0) { |
80e8027a JD |
1266 | goto error; |
1267 | } | |
6763619c | 1268 | session_id = be64toh(request.session_id); |
80e8027a JD |
1269 | |
1270 | health_code_update(); | |
1271 | ||
53efb85a MD |
1272 | memset(&response, 0, sizeof(response)); |
1273 | ||
7591bab1 | 1274 | session = session_get_by_id(session_id); |
2f8f53af | 1275 | if (!session) { |
6763619c | 1276 | DBG("Relay session %" PRIu64 " not found", session_id); |
c4e361a4 | 1277 | response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_ERR); |
80e8027a JD |
1278 | goto send_reply; |
1279 | } | |
1280 | ||
7591bab1 | 1281 | if (!viewer_session_is_attached(conn->viewer_session, session)) { |
c4e361a4 | 1282 | response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_ERR); |
80e8027a JD |
1283 | goto send_reply; |
1284 | } | |
1285 | ||
c876d657 JR |
1286 | /* |
1287 | * For any new stream, create it with LTTNG_VIEWER_SEEK_BEGINNING since | |
1288 | * that at this point the client is already attached to the session.Aany | |
1289 | * initial stream will have been created with the seek type at attach | |
1290 | * time (for now most readers use the LTTNG_VIEWER_SEEK_LAST on attach). | |
1291 | * Otherwise any event happening in a new stream between the attach and | |
1292 | * a call to viewer_get_new_streams will be "lost" (never received) from | |
1293 | * the viewer's point of view. | |
1294 | */ | |
c06fdd95 | 1295 | pthread_mutex_lock(&session->lock); |
8cd15f6a MD |
1296 | /* |
1297 | * If a session rotation is ongoing, do not attempt to open any | |
1298 | * stream, because the chunk can be in an intermediate state | |
1299 | * due to directory renaming. | |
1300 | */ | |
fe88e517 | 1301 | if (session_has_ongoing_rotation(session)) { |
8cd15f6a MD |
1302 | DBG("Relay session %" PRIu64 " rotation ongoing", session_id); |
1303 | response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_NO_NEW); | |
1304 | goto send_reply_unlock; | |
1305 | } | |
b66a15d1 | 1306 | ret = make_viewer_streams(session, |
28ab034a JG |
1307 | conn->viewer_session, |
1308 | LTTNG_VIEWER_SEEK_BEGINNING, | |
1309 | &nb_total, | |
1310 | &nb_unsent, | |
1311 | &nb_created, | |
1312 | &closed); | |
2f8f53af | 1313 | if (ret < 0) { |
14e34907 JG |
1314 | /* |
1315 | * This is caused by an internal error; propagate the negative | |
1316 | * 'ret' to close the connection. | |
1317 | */ | |
1318 | response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_ERR); | |
0283afa9 | 1319 | goto send_reply_unlock; |
2f8f53af | 1320 | } |
283a96e4 JG |
1321 | |
1322 | uatomic_set(&session->new_streams, 0); | |
3d0bbd40 JG |
1323 | send_streams = 1; |
1324 | response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_OK); | |
b66a15d1 | 1325 | |
2f8f53af | 1326 | /* Only send back the newly created streams with the unsent ones. */ |
98b82dfa | 1327 | nb_streams = nb_unsent + nb_created; |
80e8027a JD |
1328 | response.streams_count = htobe32(nb_streams); |
1329 | ||
4479f682 | 1330 | /* |
2229a09c MD |
1331 | * If the session is closed, HUP when there are no more streams |
1332 | * with data. | |
4479f682 | 1333 | */ |
bddf80e4 | 1334 | if (closed && nb_total == 0) { |
4479f682 | 1335 | send_streams = 0; |
bddf80e4 | 1336 | response.streams_count = 0; |
4479f682 | 1337 | response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_HUP); |
3d0bbd40 | 1338 | goto send_reply_unlock; |
4479f682 | 1339 | } |
3d0bbd40 JG |
1340 | send_reply_unlock: |
1341 | pthread_mutex_unlock(&session->lock); | |
4479f682 | 1342 | |
80e8027a JD |
1343 | send_reply: |
1344 | health_code_update(); | |
58eb9381 | 1345 | ret = send_response(conn->sock, &response, sizeof(response)); |
80e8027a | 1346 | if (ret < 0) { |
7591bab1 | 1347 | goto end_put_session; |
80e8027a JD |
1348 | } |
1349 | health_code_update(); | |
1350 | ||
1351 | /* | |
7591bab1 MD |
1352 | * Unknown or empty session, just return gracefully, the viewer |
1353 | * knows what is happening. | |
80e8027a JD |
1354 | */ |
1355 | if (!send_streams || !nb_streams) { | |
1356 | ret = 0; | |
7591bab1 | 1357 | goto end_put_session; |
80e8027a JD |
1358 | } |
1359 | ||
2f8f53af | 1360 | /* |
7591bab1 MD |
1361 | * Send stream and *DON'T* ignore the sent flag so every viewer |
1362 | * streams that were not sent from that point will be sent to | |
1363 | * the viewer. | |
2f8f53af | 1364 | */ |
98b82dfa | 1365 | ret = send_viewer_streams(conn->sock, session_id, 0, conn->viewer_session); |
2f8f53af | 1366 | if (ret < 0) { |
7591bab1 | 1367 | goto end_put_session; |
80e8027a JD |
1368 | } |
1369 | ||
7591bab1 MD |
1370 | end_put_session: |
1371 | if (session) { | |
1372 | session_put(session); | |
1373 | } | |
80e8027a JD |
1374 | error: |
1375 | return ret; | |
1376 | } | |
1377 | ||
d3e2ba59 JD |
1378 | /* |
1379 | * Send the viewer the list of current sessions. | |
1380 | */ | |
28ab034a | 1381 | static int viewer_attach_session(struct relay_connection *conn) |
d3e2ba59 | 1382 | { |
2f8f53af DG |
1383 | int send_streams = 0; |
1384 | ssize_t ret; | |
98b82dfa | 1385 | unsigned int nb_streams = 0; |
2f8f53af | 1386 | enum lttng_viewer_seek seek_type; |
d3e2ba59 JD |
1387 | struct lttng_viewer_attach_session_request request; |
1388 | struct lttng_viewer_attach_session_response response; | |
cd9adb8b | 1389 | struct relay_session *session = nullptr; |
dbd6665b | 1390 | enum lttng_viewer_attach_return_code viewer_attach_status; |
bddf80e4 | 1391 | bool closed = false; |
c06fdd95 | 1392 | uint64_t session_id; |
d3e2ba59 | 1393 | |
a0377dfe | 1394 | LTTNG_ASSERT(conn); |
d3e2ba59 | 1395 | |
eea7556c MD |
1396 | health_code_update(); |
1397 | ||
2f8f53af | 1398 | /* Receive the request from the connected client. */ |
58eb9381 | 1399 | ret = recv_request(conn->sock, &request, sizeof(request)); |
2f8f53af | 1400 | if (ret < 0) { |
d3e2ba59 JD |
1401 | goto error; |
1402 | } | |
1403 | ||
c06fdd95 | 1404 | session_id = be64toh(request.session_id); |
07d9fffa | 1405 | |
eea7556c MD |
1406 | health_code_update(); |
1407 | ||
53efb85a MD |
1408 | memset(&response, 0, sizeof(response)); |
1409 | ||
c3b7390b | 1410 | if (!conn->viewer_session) { |
07d9fffa FD |
1411 | viewer_attach_status = LTTNG_VIEWER_ATTACH_NO_SESSION; |
1412 | DBG("Client trying to attach before creating a live viewer session, returning status=%s", | |
28ab034a | 1413 | lttng_viewer_attach_return_code_str(viewer_attach_status)); |
c3b7390b JD |
1414 | goto send_reply; |
1415 | } | |
1416 | ||
c06fdd95 | 1417 | session = session_get_by_id(session_id); |
2f8f53af | 1418 | if (!session) { |
07d9fffa FD |
1419 | viewer_attach_status = LTTNG_VIEWER_ATTACH_UNK; |
1420 | DBG("Relay session %" PRIu64 " not found, returning status=%s", | |
28ab034a JG |
1421 | session_id, |
1422 | lttng_viewer_attach_return_code_str(viewer_attach_status)); | |
d3e2ba59 JD |
1423 | goto send_reply; |
1424 | } | |
07d9fffa | 1425 | DBG("Attach relay session ID %" PRIu64 " received", session_id); |
d3e2ba59 | 1426 | |
c06fdd95 | 1427 | pthread_mutex_lock(&session->lock); |
7591bab1 | 1428 | if (session->live_timer == 0) { |
07d9fffa FD |
1429 | viewer_attach_status = LTTNG_VIEWER_ATTACH_NOT_LIVE; |
1430 | DBG("Relay session ID %" PRIu64 " is not a live session, returning status=%s", | |
28ab034a JG |
1431 | session_id, |
1432 | lttng_viewer_attach_return_code_str(viewer_attach_status)); | |
d3e2ba59 | 1433 | goto send_reply; |
7591bab1 MD |
1434 | } |
1435 | ||
1436 | send_streams = 1; | |
28ab034a | 1437 | viewer_attach_status = viewer_session_attach(conn->viewer_session, session); |
dbd6665b | 1438 | if (viewer_attach_status != LTTNG_VIEWER_ATTACH_OK) { |
07d9fffa | 1439 | DBG("Error attaching to relay session %" PRIu64 ", returning status=%s", |
28ab034a JG |
1440 | session_id, |
1441 | lttng_viewer_attach_return_code_str(viewer_attach_status)); | |
7591bab1 | 1442 | goto send_reply; |
d3e2ba59 JD |
1443 | } |
1444 | ||
1445 | switch (be32toh(request.seek)) { | |
c4e361a4 JD |
1446 | case LTTNG_VIEWER_SEEK_BEGINNING: |
1447 | case LTTNG_VIEWER_SEEK_LAST: | |
07d9fffa | 1448 | viewer_attach_status = LTTNG_VIEWER_ATTACH_OK; |
ac497a37 | 1449 | seek_type = (lttng_viewer_seek) be32toh(request.seek); |
d3e2ba59 JD |
1450 | break; |
1451 | default: | |
28ab034a JG |
1452 | ERR("Wrong seek parameter for relay session %" PRIu64 ", returning status=%s", |
1453 | session_id, | |
1454 | lttng_viewer_attach_return_code_str(viewer_attach_status)); | |
07d9fffa | 1455 | viewer_attach_status = LTTNG_VIEWER_ATTACH_SEEK_ERR; |
d3e2ba59 JD |
1456 | send_streams = 0; |
1457 | goto send_reply; | |
1458 | } | |
1459 | ||
8cd15f6a MD |
1460 | /* |
1461 | * If a session rotation is ongoing, do not attempt to open any | |
1462 | * stream, because the chunk can be in an intermediate state | |
1463 | * due to directory renaming. | |
1464 | */ | |
fe88e517 | 1465 | if (session_has_ongoing_rotation(session)) { |
8cd15f6a MD |
1466 | DBG("Relay session %" PRIu64 " rotation ongoing", session_id); |
1467 | send_streams = 0; | |
1468 | goto send_reply; | |
1469 | } | |
1470 | ||
28ab034a | 1471 | ret = make_viewer_streams( |
cd9adb8b | 1472 | session, conn->viewer_session, seek_type, &nb_streams, nullptr, nullptr, &closed); |
2f8f53af | 1473 | if (ret < 0) { |
7591bab1 | 1474 | goto end_put_session; |
d3e2ba59 | 1475 | } |
c06fdd95 JG |
1476 | pthread_mutex_unlock(&session->lock); |
1477 | session_put(session); | |
cd9adb8b | 1478 | session = nullptr; |
c06fdd95 JG |
1479 | |
1480 | response.streams_count = htobe32(nb_streams); | |
bddf80e4 MD |
1481 | /* |
1482 | * If the session is closed when the viewer is attaching, it | |
1483 | * means some of the streams may have been concurrently removed, | |
1484 | * so we don't allow the viewer to attach, even if there are | |
1485 | * streams available. | |
1486 | */ | |
1487 | if (closed) { | |
1488 | send_streams = 0; | |
1489 | response.streams_count = 0; | |
07d9fffa FD |
1490 | viewer_attach_status = LTTNG_VIEWER_ATTACH_UNK; |
1491 | ERR("Session %" PRIu64 " is closed, returning status=%s", | |
28ab034a JG |
1492 | session_id, |
1493 | lttng_viewer_attach_return_code_str(viewer_attach_status)); | |
bddf80e4 MD |
1494 | goto send_reply; |
1495 | } | |
1496 | ||
d3e2ba59 | 1497 | send_reply: |
eea7556c | 1498 | health_code_update(); |
07d9fffa FD |
1499 | |
1500 | response.status = htobe32((uint32_t) viewer_attach_status); | |
1501 | ||
58eb9381 | 1502 | ret = send_response(conn->sock, &response, sizeof(response)); |
d3e2ba59 | 1503 | if (ret < 0) { |
7591bab1 | 1504 | goto end_put_session; |
d3e2ba59 | 1505 | } |
eea7556c | 1506 | health_code_update(); |
d3e2ba59 JD |
1507 | |
1508 | /* | |
7591bab1 MD |
1509 | * Unknown or empty session, just return gracefully, the viewer |
1510 | * knows what is happening. | |
d3e2ba59 | 1511 | */ |
157df586 | 1512 | if (!send_streams || !nb_streams) { |
d3e2ba59 | 1513 | ret = 0; |
7591bab1 | 1514 | goto end_put_session; |
d3e2ba59 JD |
1515 | } |
1516 | ||
2f8f53af | 1517 | /* Send stream and ignore the sent flag. */ |
98b82dfa | 1518 | ret = send_viewer_streams(conn->sock, session_id, 1, conn->viewer_session); |
2f8f53af | 1519 | if (ret < 0) { |
7591bab1 | 1520 | goto end_put_session; |
d3e2ba59 | 1521 | } |
d3e2ba59 | 1522 | |
7591bab1 MD |
1523 | end_put_session: |
1524 | if (session) { | |
c06fdd95 | 1525 | pthread_mutex_unlock(&session->lock); |
7591bab1 MD |
1526 | session_put(session); |
1527 | } | |
4a9daf17 JD |
1528 | error: |
1529 | return ret; | |
1530 | } | |
1531 | ||
878c34cf DG |
1532 | /* |
1533 | * Open the index file if needed for the given vstream. | |
1534 | * | |
f8f3885c MD |
1535 | * If an index file is successfully opened, the vstream will set it as its |
1536 | * current index file. | |
878c34cf DG |
1537 | * |
1538 | * Return 0 on success, a negative value on error (-ENOENT if not ready yet). | |
7591bab1 MD |
1539 | * |
1540 | * Called with rstream lock held. | |
878c34cf | 1541 | */ |
28ab034a | 1542 | static int try_open_index(struct relay_viewer_stream *vstream, struct relay_stream *rstream) |
878c34cf DG |
1543 | { |
1544 | int ret = 0; | |
ebb29c10 JG |
1545 | const uint32_t connection_major = rstream->trace->session->major; |
1546 | const uint32_t connection_minor = rstream->trace->session->minor; | |
3ff5c5db | 1547 | enum lttng_trace_chunk_status chunk_status; |
878c34cf | 1548 | |
f8f3885c | 1549 | if (vstream->index_file) { |
878c34cf DG |
1550 | goto end; |
1551 | } | |
1552 | ||
1553 | /* | |
7591bab1 | 1554 | * First time, we open the index file and at least one index is ready. |
878c34cf | 1555 | */ |
28ab034a | 1556 | if (rstream->index_received_seqcount == 0 || !vstream->stream_file.trace_chunk) { |
878c34cf DG |
1557 | ret = -ENOENT; |
1558 | goto end; | |
1559 | } | |
80516611 | 1560 | |
3ff5c5db | 1561 | chunk_status = lttng_index_file_create_from_trace_chunk_read_only( |
28ab034a JG |
1562 | vstream->stream_file.trace_chunk, |
1563 | rstream->path_name, | |
1564 | rstream->channel_name, | |
1565 | rstream->tracefile_size, | |
1566 | vstream->current_tracefile_id, | |
1567 | lttng_to_index_major(connection_major, connection_minor), | |
1568 | lttng_to_index_minor(connection_major, connection_minor), | |
1569 | true, | |
1570 | &vstream->index_file); | |
3ff5c5db MD |
1571 | if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { |
1572 | if (chunk_status == LTTNG_TRACE_CHUNK_STATUS_NO_FILE) { | |
1573 | ret = -ENOENT; | |
1574 | } else { | |
1575 | ret = -1; | |
1576 | } | |
878c34cf DG |
1577 | } |
1578 | ||
1579 | end: | |
1580 | return ret; | |
1581 | } | |
1582 | ||
1583 | /* | |
7591bab1 MD |
1584 | * Check the status of the index for the given stream. This function |
1585 | * updates the index structure if needed and can put (close) the vstream | |
1586 | * in the HUP situation. | |
1587 | * | |
1588 | * Return 0 means that we can proceed with the index. A value of 1 means | |
1589 | * that the index has been updated and is ready to be sent to the | |
1590 | * client. A negative value indicates an error that can't be handled. | |
878c34cf | 1591 | * |
7591bab1 | 1592 | * Called with rstream lock held. |
878c34cf DG |
1593 | */ |
1594 | static int check_index_status(struct relay_viewer_stream *vstream, | |
28ab034a JG |
1595 | struct relay_stream *rstream, |
1596 | struct ctf_trace *trace, | |
1597 | struct lttng_viewer_index *index) | |
878c34cf DG |
1598 | { |
1599 | int ret; | |
1600 | ||
68c40154 | 1601 | DBG("Check index status: index_received_seqcount %" PRIu64 " " |
28ab034a JG |
1602 | "index_sent_seqcount %" PRIu64 " " |
1603 | "for stream %" PRIu64, | |
1604 | rstream->index_received_seqcount, | |
1605 | vstream->index_sent_seqcount, | |
1606 | vstream->stream->stream_handle); | |
1607 | if ((trace->session->connection_closed || rstream->closed) && | |
1608 | rstream->index_received_seqcount == vstream->index_sent_seqcount) { | |
797bc362 MD |
1609 | /* |
1610 | * Last index sent and session connection or relay | |
1611 | * stream are closed. | |
1612 | */ | |
7e4fb89b FD |
1613 | index->status = LTTNG_VIEWER_INDEX_HUP; |
1614 | DBG("Check index status: Connection or stream are closed, stream %" PRIu64 | |
28ab034a JG |
1615 | ",connection-closed=%d, relay-stream-closed=%d, returning status=%s", |
1616 | vstream->stream->stream_handle, | |
1617 | trace->session->connection_closed, | |
1618 | rstream->closed, | |
1619 | lttng_viewer_next_index_return_code_str( | |
1620 | (enum lttng_viewer_next_index_return_code) index->status)); | |
7591bab1 MD |
1621 | goto hup; |
1622 | } else if (rstream->beacon_ts_end != -1ULL && | |
28ab034a JG |
1623 | (rstream->index_received_seqcount == 0 || |
1624 | (vstream->index_sent_seqcount != 0 && | |
1625 | rstream->index_received_seqcount <= vstream->index_sent_seqcount))) { | |
7591bab1 MD |
1626 | /* |
1627 | * We've received a synchronization beacon and the last index | |
1628 | * available has been sent, the index for now is inactive. | |
1629 | * | |
1630 | * In this case, we have received a beacon which allows us to | |
1631 | * inform the client of a time interval during which we can | |
1632 | * guarantee that there are no events to read (and never will | |
1633 | * be). | |
b0d240a2 MD |
1634 | * |
1635 | * The sent seqcount can grow higher than receive seqcount on | |
1636 | * clear because the rotation performed by clear will push | |
1637 | * the index_sent_seqcount ahead (see | |
1638 | * viewer_stream_sync_tracefile_array_tail) and skip over | |
1639 | * packet sequence numbers. | |
7591bab1 | 1640 | */ |
7e4fb89b | 1641 | index->status = LTTNG_VIEWER_INDEX_INACTIVE; |
7591bab1 MD |
1642 | index->timestamp_end = htobe64(rstream->beacon_ts_end); |
1643 | index->stream_id = htobe64(rstream->ctf_stream_id); | |
7e4fb89b | 1644 | DBG("Check index status: inactive with beacon, for stream %" PRIu64 |
28ab034a JG |
1645 | ", returning status=%s", |
1646 | vstream->stream->stream_handle, | |
1647 | lttng_viewer_next_index_return_code_str( | |
1648 | (enum lttng_viewer_next_index_return_code) index->status)); | |
7591bab1 | 1649 | goto index_ready; |
b0d240a2 | 1650 | } else if (rstream->index_received_seqcount == 0 || |
28ab034a JG |
1651 | (vstream->index_sent_seqcount != 0 && |
1652 | rstream->index_received_seqcount <= vstream->index_sent_seqcount)) { | |
7591bab1 | 1653 | /* |
b0d240a2 | 1654 | * This checks whether received <= sent seqcount. In |
a44ca2ca MD |
1655 | * this case, we have not received a beacon. Therefore, |
1656 | * we can only ask the client to retry later. | |
b0d240a2 MD |
1657 | * |
1658 | * The sent seqcount can grow higher than receive seqcount on | |
1659 | * clear because the rotation performed by clear will push | |
1660 | * the index_sent_seqcount ahead (see | |
1661 | * viewer_stream_sync_tracefile_array_tail) and skip over | |
1662 | * packet sequence numbers. | |
7591bab1 | 1663 | */ |
7e4fb89b FD |
1664 | index->status = LTTNG_VIEWER_INDEX_RETRY; |
1665 | DBG("Check index status:" | |
28ab034a JG |
1666 | "did not received beacon for stream %" PRIu64 ", returning status=%s", |
1667 | vstream->stream->stream_handle, | |
1668 | lttng_viewer_next_index_return_code_str( | |
1669 | (enum lttng_viewer_next_index_return_code) index->status)); | |
7591bab1 | 1670 | goto index_ready; |
a44ca2ca | 1671 | } else if (!tracefile_array_seq_in_file(rstream->tfa, |
28ab034a JG |
1672 | vstream->current_tracefile_id, |
1673 | vstream->index_sent_seqcount)) { | |
7591bab1 | 1674 | /* |
a44ca2ca MD |
1675 | * The next index we want to send cannot be read either |
1676 | * because we need to perform a rotation, or due to | |
1677 | * the producer having overwritten its trace file. | |
7591bab1 | 1678 | */ |
28ab034a | 1679 | DBG("Viewer stream %" PRIu64 " rotation", vstream->stream->stream_handle); |
7591bab1 | 1680 | ret = viewer_stream_rotate(vstream); |
b0d240a2 | 1681 | if (ret == 1) { |
7591bab1 | 1682 | /* EOF across entire stream. */ |
7e4fb89b FD |
1683 | index->status = LTTNG_VIEWER_INDEX_HUP; |
1684 | DBG("Check index status:" | |
28ab034a JG |
1685 | "reached end of file for stream %" PRIu64 ", returning status=%s", |
1686 | vstream->stream->stream_handle, | |
1687 | lttng_viewer_next_index_return_code_str( | |
1688 | (enum lttng_viewer_next_index_return_code) index->status)); | |
7591bab1 MD |
1689 | goto hup; |
1690 | } | |
7591bab1 | 1691 | /* |
a44ca2ca MD |
1692 | * If we have been pushed due to overwrite, it |
1693 | * necessarily means there is data that can be read in | |
1694 | * the stream. If we rotated because we reached the end | |
1695 | * of a tracefile, it means the following tracefile | |
1696 | * needs to contain at least one index, else we would | |
1697 | * have already returned LTTNG_VIEWER_INDEX_RETRY to the | |
1698 | * viewer. The updated index_sent_seqcount needs to | |
1699 | * point to a readable index entry now. | |
1700 | * | |
1701 | * In the case where we "rotate" on a single file, we | |
1702 | * can end up in a case where the requested index is | |
1703 | * still unavailable. | |
7591bab1 | 1704 | */ |
a44ca2ca | 1705 | if (rstream->tracefile_count == 1 && |
28ab034a JG |
1706 | !tracefile_array_seq_in_file(rstream->tfa, |
1707 | vstream->current_tracefile_id, | |
1708 | vstream->index_sent_seqcount)) { | |
7e4fb89b FD |
1709 | index->status = LTTNG_VIEWER_INDEX_RETRY; |
1710 | DBG("Check index status:" | |
28ab034a JG |
1711 | "tracefile array sequence number %" PRIu64 |
1712 | " not in file for stream %" PRIu64 ", returning status=%s", | |
1713 | vstream->index_sent_seqcount, | |
1714 | vstream->stream->stream_handle, | |
1715 | lttng_viewer_next_index_return_code_str( | |
1716 | (enum lttng_viewer_next_index_return_code) index->status)); | |
a44ca2ca | 1717 | goto index_ready; |
878c34cf | 1718 | } |
28ab034a JG |
1719 | LTTNG_ASSERT(tracefile_array_seq_in_file( |
1720 | rstream->tfa, vstream->current_tracefile_id, vstream->index_sent_seqcount)); | |
878c34cf | 1721 | } |
a44ca2ca MD |
1722 | /* ret == 0 means successful so we continue. */ |
1723 | ret = 0; | |
878c34cf DG |
1724 | return ret; |
1725 | ||
1726 | hup: | |
7591bab1 | 1727 | viewer_stream_put(vstream); |
878c34cf DG |
1728 | index_ready: |
1729 | return 1; | |
1730 | } | |
1731 | ||
28ab034a JG |
1732 | static void viewer_stream_rotate_to_trace_chunk(struct relay_viewer_stream *vstream, |
1733 | struct lttng_trace_chunk *new_trace_chunk) | |
80516611 JG |
1734 | { |
1735 | lttng_trace_chunk_put(vstream->stream_file.trace_chunk); | |
1736 | ||
1737 | if (new_trace_chunk) { | |
28ab034a | 1738 | const bool acquired_reference = lttng_trace_chunk_get(new_trace_chunk); |
80516611 | 1739 | |
a0377dfe | 1740 | LTTNG_ASSERT(acquired_reference); |
80516611 JG |
1741 | } |
1742 | ||
1743 | vstream->stream_file.trace_chunk = new_trace_chunk; | |
1744 | viewer_stream_sync_tracefile_array_tail(vstream); | |
1745 | viewer_stream_close_files(vstream); | |
1746 | } | |
1747 | ||
d3e2ba59 JD |
1748 | /* |
1749 | * Send the next index for a stream. | |
1750 | * | |
1751 | * Return 0 on success or else a negative value. | |
1752 | */ | |
28ab034a | 1753 | static int viewer_get_next_index(struct relay_connection *conn) |
d3e2ba59 JD |
1754 | { |
1755 | int ret; | |
1756 | struct lttng_viewer_get_next_index request_index; | |
1757 | struct lttng_viewer_index viewer_index; | |
50adc264 | 1758 | struct ctf_packet_index packet_index; |
cd9adb8b JG |
1759 | struct relay_viewer_stream *vstream = nullptr; |
1760 | struct relay_stream *rstream = nullptr; | |
1761 | struct ctf_trace *ctf_trace = nullptr; | |
1762 | struct relay_viewer_stream *metadata_viewer_stream = nullptr; | |
bb1dcf01 MD |
1763 | bool viewer_stream_and_session_in_same_chunk, viewer_stream_one_rotation_behind; |
1764 | uint64_t stream_file_chunk_id = -1ULL, viewer_session_chunk_id = -1ULL; | |
1765 | enum lttng_trace_chunk_status status; | |
283a96e4 | 1766 | bool attached_sessions_have_new_streams = false; |
d3e2ba59 | 1767 | |
a0377dfe | 1768 | LTTNG_ASSERT(conn); |
d3e2ba59 | 1769 | |
7591bab1 | 1770 | memset(&viewer_index, 0, sizeof(viewer_index)); |
eea7556c | 1771 | health_code_update(); |
2f8f53af | 1772 | |
58eb9381 | 1773 | ret = recv_request(conn->sock, &request_index, sizeof(request_index)); |
2f8f53af | 1774 | if (ret < 0) { |
d3e2ba59 JD |
1775 | goto end; |
1776 | } | |
eea7556c | 1777 | health_code_update(); |
d3e2ba59 | 1778 | |
7591bab1 | 1779 | vstream = viewer_stream_get_by_id(be64toh(request_index.stream_id)); |
6763619c | 1780 | if (!vstream) { |
7e4fb89b | 1781 | viewer_index.status = LTTNG_VIEWER_INDEX_ERR; |
28ab034a JG |
1782 | DBG("Client requested index of unknown stream id %" PRIu64 ", returning status=%s", |
1783 | (uint64_t) be64toh(request_index.stream_id), | |
1784 | lttng_viewer_next_index_return_code_str( | |
1785 | (enum lttng_viewer_next_index_return_code) viewer_index.status)); | |
f1883937 | 1786 | goto send_reply; |
2a174661 DG |
1787 | } |
1788 | ||
7591bab1 MD |
1789 | /* Use back. ref. Protected by refcounts. */ |
1790 | rstream = vstream->stream; | |
1791 | ctf_trace = rstream->trace; | |
d3e2ba59 | 1792 | |
7591bab1 | 1793 | /* metadata_viewer_stream may be NULL. */ |
28ab034a | 1794 | metadata_viewer_stream = ctf_trace_get_viewer_metadata_stream(ctf_trace); |
2a174661 | 1795 | |
b6ae2a95 MD |
1796 | /* |
1797 | * Hold the session lock to protect against concurrent changes | |
1798 | * to the chunk files (e.g. rename done by clear), which are | |
1799 | * protected by the session ongoing rotation state. Those are | |
1800 | * synchronized with the session lock. | |
1801 | */ | |
1802 | pthread_mutex_lock(&rstream->trace->session->lock); | |
7591bab1 | 1803 | pthread_mutex_lock(&rstream->lock); |
d3e2ba59 JD |
1804 | |
1805 | /* | |
1806 | * The viewer should not ask for index on metadata stream. | |
1807 | */ | |
7591bab1 | 1808 | if (rstream->is_metadata) { |
7e4fb89b | 1809 | viewer_index.status = LTTNG_VIEWER_INDEX_HUP; |
28ab034a JG |
1810 | DBG("Client requested index of a metadata stream id %" PRIu64 |
1811 | ", returning status=%s", | |
1812 | (uint64_t) be64toh(request_index.stream_id), | |
1813 | lttng_viewer_next_index_return_code_str( | |
1814 | (enum lttng_viewer_next_index_return_code) viewer_index.status)); | |
d3e2ba59 JD |
1815 | goto send_reply; |
1816 | } | |
1817 | ||
283a96e4 JG |
1818 | ret = check_new_streams(conn); |
1819 | if (ret < 0) { | |
1820 | viewer_index.status = LTTNG_VIEWER_INDEX_ERR; | |
1821 | ERR("Error checking for new streams in the attached sessions, returning status=%s", | |
1822 | lttng_viewer_next_index_return_code_str( | |
1823 | (enum lttng_viewer_next_index_return_code) viewer_index.status)); | |
1824 | goto send_reply; | |
1825 | } else if (ret == 1) { | |
1826 | attached_sessions_have_new_streams = true; | |
1827 | } | |
1828 | ||
b0d240a2 MD |
1829 | if (rstream->ongoing_rotation.is_set) { |
1830 | /* Rotation is ongoing, try again later. */ | |
7e4fb89b | 1831 | viewer_index.status = LTTNG_VIEWER_INDEX_RETRY; |
28ab034a JG |
1832 | DBG("Client requested index for stream id %" PRIu64 |
1833 | " while a stream rotation is ongoing, returning status=%s", | |
1834 | (uint64_t) be64toh(request_index.stream_id), | |
1835 | lttng_viewer_next_index_return_code_str( | |
1836 | (enum lttng_viewer_next_index_return_code) viewer_index.status)); | |
b0d240a2 MD |
1837 | goto send_reply; |
1838 | } | |
1839 | ||
fe88e517 | 1840 | if (session_has_ongoing_rotation(rstream->trace->session)) { |
b0d240a2 | 1841 | /* Rotation is ongoing, try again later. */ |
7e4fb89b | 1842 | viewer_index.status = LTTNG_VIEWER_INDEX_RETRY; |
28ab034a JG |
1843 | DBG("Client requested index for stream id %" PRIu64 |
1844 | " while a session rotation is ongoing, returning status=%s", | |
1845 | (uint64_t) be64toh(request_index.stream_id), | |
1846 | lttng_viewer_next_index_return_code_str( | |
1847 | (enum lttng_viewer_next_index_return_code) viewer_index.status)); | |
b0d240a2 MD |
1848 | goto send_reply; |
1849 | } | |
1850 | ||
80516611 JG |
1851 | /* |
1852 | * Transition the viewer session into the newest trace chunk available. | |
1853 | */ | |
28ab034a JG |
1854 | if (!lttng_trace_chunk_ids_equal(conn->viewer_session->current_trace_chunk, |
1855 | rstream->trace_chunk)) { | |
9a9c8637 | 1856 | DBG("Relay stream and viewer chunk ids differ"); |
b0d240a2 | 1857 | |
28ab034a JG |
1858 | ret = viewer_session_set_trace_chunk_copy(conn->viewer_session, |
1859 | rstream->trace_chunk); | |
ad8bec24 | 1860 | if (ret) { |
7e4fb89b FD |
1861 | viewer_index.status = LTTNG_VIEWER_INDEX_ERR; |
1862 | ERR("Error copying trace chunk for stream id %" PRIu64 | |
28ab034a JG |
1863 | ", returning status=%s", |
1864 | (uint64_t) be64toh(request_index.stream_id), | |
1865 | lttng_viewer_next_index_return_code_str( | |
1866 | (enum lttng_viewer_next_index_return_code) viewer_index.status)); | |
b0d240a2 MD |
1867 | goto send_reply; |
1868 | } | |
b0d240a2 | 1869 | } |
b0d240a2 | 1870 | |
80516611 JG |
1871 | /* |
1872 | * Transition the viewer stream into the latest trace chunk available. | |
1873 | * | |
1874 | * Note that the stream must _not_ rotate in one precise condition: | |
1875 | * the relay stream has rotated to a NULL trace chunk and the viewer | |
1876 | * stream is consuming the trace chunk that was active just before | |
1877 | * that rotation to NULL. | |
1878 | * | |
1879 | * This allows clients to consume all the packets of a trace chunk | |
1880 | * after a session's destruction. | |
1881 | */ | |
bb1dcf01 | 1882 | if (vstream->stream_file.trace_chunk) { |
28ab034a JG |
1883 | status = lttng_trace_chunk_get_id(vstream->stream_file.trace_chunk, |
1884 | &stream_file_chunk_id); | |
bb1dcf01 MD |
1885 | LTTNG_ASSERT(status == LTTNG_TRACE_CHUNK_STATUS_OK); |
1886 | } | |
1887 | if (conn->viewer_session->current_trace_chunk) { | |
28ab034a JG |
1888 | status = lttng_trace_chunk_get_id(conn->viewer_session->current_trace_chunk, |
1889 | &viewer_session_chunk_id); | |
bb1dcf01 MD |
1890 | LTTNG_ASSERT(status == LTTNG_TRACE_CHUNK_STATUS_OK); |
1891 | } | |
1892 | ||
1893 | viewer_stream_and_session_in_same_chunk = lttng_trace_chunk_ids_equal( | |
28ab034a | 1894 | conn->viewer_session->current_trace_chunk, vstream->stream_file.trace_chunk); |
bb1dcf01 | 1895 | viewer_stream_one_rotation_behind = rstream->completed_rotation_count == |
28ab034a | 1896 | vstream->last_seen_rotation_count + 1; |
bb1dcf01 MD |
1897 | |
1898 | if (viewer_stream_and_session_in_same_chunk) { | |
1899 | DBG("Transition to latest chunk check (%s -> %s): Same chunk, no need to rotate", | |
28ab034a JG |
1900 | vstream->stream_file.trace_chunk ? |
1901 | std::to_string(stream_file_chunk_id).c_str() : | |
1902 | "None", | |
1903 | conn->viewer_session->current_trace_chunk ? | |
1904 | std::to_string(viewer_session_chunk_id).c_str() : | |
1905 | "None"); | |
bb1dcf01 MD |
1906 | } else if (viewer_stream_one_rotation_behind && !rstream->trace_chunk) { |
1907 | DBG("Transition to latest chunk check (%s -> %s): One chunk behind relay stream which is being destroyed, no need to rotate", | |
28ab034a JG |
1908 | vstream->stream_file.trace_chunk ? |
1909 | std::to_string(stream_file_chunk_id).c_str() : | |
1910 | "None", | |
1911 | conn->viewer_session->current_trace_chunk ? | |
1912 | std::to_string(viewer_session_chunk_id).c_str() : | |
1913 | "None"); | |
7c8d0f41 JG |
1914 | } else if (vstream->stream_file.trace_chunk && |
1915 | rstream->completed_rotation_count == vstream->last_seen_rotation_count && | |
1916 | !rstream->trace_chunk) { | |
98b82dfa KS |
1917 | /* |
1918 | * When a relay stream is closed, there is a window before the rotation of the | |
1919 | * streams happens, during which the next index may be fetched. If the seen | |
1920 | * rotations are the same and the relay stream trace chunk is null, don't rotate. | |
1921 | * When the close finishes, the rotation count on the relay stream will go up. | |
1922 | */ | |
1923 | DBG("Transition to latest chunk check (%s -> %s): relay stream chunk is null, but viewer stream knows a chunk and isn't yet behind a rotation", | |
1924 | vstream->stream_file.trace_chunk ? | |
1925 | std::to_string(stream_file_chunk_id).c_str() : | |
1926 | "None", | |
1927 | conn->viewer_session->current_trace_chunk ? | |
1928 | std::to_string(viewer_session_chunk_id).c_str() : | |
1929 | "None"); | |
bb1dcf01 MD |
1930 | } else { |
1931 | DBG("Transition to latest chunk check (%s -> %s): Viewer stream chunk ID and viewer session chunk ID differ, rotating viewer stream", | |
28ab034a JG |
1932 | vstream->stream_file.trace_chunk ? |
1933 | std::to_string(stream_file_chunk_id).c_str() : | |
1934 | "None", | |
1935 | conn->viewer_session->current_trace_chunk ? | |
1936 | std::to_string(viewer_session_chunk_id).c_str() : | |
1937 | "None"); | |
bb1dcf01 | 1938 | |
80516611 | 1939 | viewer_stream_rotate_to_trace_chunk(vstream, |
28ab034a JG |
1940 | conn->viewer_session->current_trace_chunk); |
1941 | vstream->last_seen_rotation_count = rstream->completed_rotation_count; | |
d3e2ba59 JD |
1942 | } |
1943 | ||
878c34cf | 1944 | ret = check_index_status(vstream, rstream, ctf_trace, &viewer_index); |
878c34cf | 1945 | if (ret < 0) { |
7591bab1 | 1946 | goto error_put; |
878c34cf DG |
1947 | } else if (ret == 1) { |
1948 | /* | |
7591bab1 MD |
1949 | * We have no index to send and check_index_status has populated |
1950 | * viewer_index's status. | |
878c34cf | 1951 | */ |
d3e2ba59 JD |
1952 | goto send_reply; |
1953 | } | |
283a96e4 | 1954 | |
7591bab1 | 1955 | /* At this point, ret is 0 thus we will be able to read the index. */ |
a0377dfe | 1956 | LTTNG_ASSERT(!ret); |
d3e2ba59 | 1957 | |
b0d240a2 MD |
1958 | /* Try to open an index if one is needed for that stream. */ |
1959 | ret = try_open_index(vstream, rstream); | |
1960 | if (ret == -ENOENT) { | |
28ab034a | 1961 | if (rstream->closed) { |
7e4fb89b FD |
1962 | viewer_index.status = LTTNG_VIEWER_INDEX_HUP; |
1963 | DBG("Cannot open index for stream id %" PRIu64 | |
98b82dfa | 1964 | " stream is closed, returning status=%s", |
28ab034a JG |
1965 | (uint64_t) be64toh(request_index.stream_id), |
1966 | lttng_viewer_next_index_return_code_str( | |
1967 | (enum lttng_viewer_next_index_return_code) viewer_index.status)); | |
b0d240a2 | 1968 | goto send_reply; |
28ab034a | 1969 | } else { |
7e4fb89b | 1970 | viewer_index.status = LTTNG_VIEWER_INDEX_RETRY; |
28ab034a JG |
1971 | DBG("Cannot open index for stream id %" PRIu64 ", returning status=%s", |
1972 | (uint64_t) be64toh(request_index.stream_id), | |
1973 | lttng_viewer_next_index_return_code_str( | |
1974 | (enum lttng_viewer_next_index_return_code) viewer_index.status)); | |
b0d240a2 | 1975 | goto send_reply; |
28ab034a | 1976 | } |
b0d240a2 MD |
1977 | } |
1978 | if (ret < 0) { | |
7e4fb89b | 1979 | viewer_index.status = LTTNG_VIEWER_INDEX_ERR; |
28ab034a JG |
1980 | ERR("Error opening index for stream id %" PRIu64 ", returning status=%s", |
1981 | (uint64_t) be64toh(request_index.stream_id), | |
1982 | lttng_viewer_next_index_return_code_str( | |
1983 | (enum lttng_viewer_next_index_return_code) viewer_index.status)); | |
b0d240a2 MD |
1984 | goto send_reply; |
1985 | } | |
1986 | ||
7591bab1 MD |
1987 | /* |
1988 | * vstream->stream_fd may be NULL if it has been closed by | |
1989 | * tracefile rotation, or if we are at the beginning of the | |
1990 | * stream. We open the data stream file here to protect against | |
1991 | * overwrite caused by tracefile rotation (in association with | |
1992 | * unlink performed before overwrite). | |
1993 | */ | |
8bb66c3c | 1994 | if (!vstream->stream_file.handle) { |
ebb29c10 | 1995 | char file_path[LTTNG_PATH_MAX]; |
8bb66c3c | 1996 | struct fs_handle *fs_handle; |
ebb29c10 JG |
1997 | |
1998 | ret = utils_stream_file_path(rstream->path_name, | |
28ab034a JG |
1999 | rstream->channel_name, |
2000 | rstream->tracefile_size, | |
2001 | vstream->current_tracefile_id, | |
cd9adb8b | 2002 | nullptr, |
28ab034a JG |
2003 | file_path, |
2004 | sizeof(file_path)); | |
7591bab1 MD |
2005 | if (ret < 0) { |
2006 | goto error_put; | |
2007 | } | |
ebb29c10 | 2008 | |
3ff5c5db MD |
2009 | /* |
2010 | * It is possible the the file we are trying to open is | |
2011 | * missing if the stream has been closed (application exits with | |
2012 | * per-pid buffers) and a clear command has been performed. | |
2013 | */ | |
8bb66c3c | 2014 | status = lttng_trace_chunk_open_fs_handle( |
28ab034a | 2015 | vstream->stream_file.trace_chunk, file_path, O_RDONLY, 0, &fs_handle, true); |
ebb29c10 | 2016 | if (status != LTTNG_TRACE_CHUNK_STATUS_OK) { |
28ab034a | 2017 | if (status == LTTNG_TRACE_CHUNK_STATUS_NO_FILE && rstream->closed) { |
7e4fb89b FD |
2018 | viewer_index.status = LTTNG_VIEWER_INDEX_HUP; |
2019 | DBG("Cannot find trace chunk file and stream is closed for stream id %" PRIu64 | |
28ab034a JG |
2020 | ", returning status=%s", |
2021 | (uint64_t) be64toh(request_index.stream_id), | |
2022 | lttng_viewer_next_index_return_code_str( | |
2023 | (enum lttng_viewer_next_index_return_code) | |
2024 | viewer_index.status)); | |
b0d240a2 MD |
2025 | goto send_reply; |
2026 | } | |
ebb29c10 | 2027 | PERROR("Failed to open trace file for viewer stream"); |
7591bab1 MD |
2028 | goto error_put; |
2029 | } | |
8bb66c3c | 2030 | vstream->stream_file.handle = fs_handle; |
d3e2ba59 JD |
2031 | } |
2032 | ||
f8f3885c MD |
2033 | ret = lttng_index_file_read(vstream->index_file, &packet_index); |
2034 | if (ret) { | |
7e4fb89b | 2035 | viewer_index.status = LTTNG_VIEWER_INDEX_ERR; |
28ab034a JG |
2036 | ERR("Relay error reading index file for stream id %" PRIu64 ", returning status=%s", |
2037 | (uint64_t) be64toh(request_index.stream_id), | |
2038 | lttng_viewer_next_index_return_code_str( | |
2039 | (enum lttng_viewer_next_index_return_code) viewer_index.status)); | |
6b6b9a5a | 2040 | goto send_reply; |
d3e2ba59 | 2041 | } else { |
7e4fb89b | 2042 | viewer_index.status = LTTNG_VIEWER_INDEX_OK; |
28ab034a JG |
2043 | DBG("Read index file for stream id %" PRIu64 ", returning status=%s", |
2044 | (uint64_t) be64toh(request_index.stream_id), | |
2045 | lttng_viewer_next_index_return_code_str( | |
2046 | (enum lttng_viewer_next_index_return_code) viewer_index.status)); | |
a44ca2ca | 2047 | vstream->index_sent_seqcount++; |
d3e2ba59 JD |
2048 | } |
2049 | ||
2050 | /* | |
2051 | * Indexes are stored in big endian, no need to switch before sending. | |
2052 | */ | |
7591bab1 | 2053 | DBG("Sending viewer index for stream %" PRIu64 " offset %" PRIu64, |
28ab034a JG |
2054 | rstream->stream_handle, |
2055 | (uint64_t) be64toh(packet_index.offset)); | |
d3e2ba59 JD |
2056 | viewer_index.offset = packet_index.offset; |
2057 | viewer_index.packet_size = packet_index.packet_size; | |
2058 | viewer_index.content_size = packet_index.content_size; | |
2059 | viewer_index.timestamp_begin = packet_index.timestamp_begin; | |
2060 | viewer_index.timestamp_end = packet_index.timestamp_end; | |
2061 | viewer_index.events_discarded = packet_index.events_discarded; | |
2062 | viewer_index.stream_id = packet_index.stream_id; | |
2063 | ||
2064 | send_reply: | |
f1883937 MD |
2065 | if (rstream) { |
2066 | pthread_mutex_unlock(&rstream->lock); | |
b6ae2a95 | 2067 | pthread_mutex_unlock(&rstream->trace->session->lock); |
f1883937 | 2068 | } |
7591bab1 MD |
2069 | |
2070 | if (metadata_viewer_stream) { | |
2071 | pthread_mutex_lock(&metadata_viewer_stream->stream->lock); | |
28ab034a JG |
2072 | DBG("get next index metadata check: recv %" PRIu64 " sent %" PRIu64, |
2073 | metadata_viewer_stream->stream->metadata_received, | |
2074 | metadata_viewer_stream->metadata_sent); | |
7591bab1 | 2075 | if (!metadata_viewer_stream->stream->metadata_received || |
28ab034a JG |
2076 | metadata_viewer_stream->stream->metadata_received > |
2077 | metadata_viewer_stream->metadata_sent) { | |
7591bab1 MD |
2078 | viewer_index.flags |= LTTNG_VIEWER_FLAG_NEW_METADATA; |
2079 | } | |
2080 | pthread_mutex_unlock(&metadata_viewer_stream->stream->lock); | |
2081 | } | |
2082 | ||
283a96e4 JG |
2083 | if (attached_sessions_have_new_streams) { |
2084 | viewer_index.flags |= LTTNG_VIEWER_FLAG_NEW_STREAM; | |
2085 | } | |
2086 | ||
d3e2ba59 | 2087 | viewer_index.flags = htobe32(viewer_index.flags); |
7e4fb89b | 2088 | viewer_index.status = htobe32(viewer_index.status); |
eea7556c | 2089 | health_code_update(); |
2f8f53af | 2090 | |
58eb9381 | 2091 | ret = send_response(conn->sock, &viewer_index, sizeof(viewer_index)); |
d3e2ba59 | 2092 | if (ret < 0) { |
7591bab1 | 2093 | goto end; |
d3e2ba59 | 2094 | } |
eea7556c | 2095 | health_code_update(); |
d3e2ba59 | 2096 | |
9237e6a1 MD |
2097 | if (vstream) { |
2098 | DBG("Index %" PRIu64 " for stream %" PRIu64 " sent", | |
28ab034a JG |
2099 | vstream->index_sent_seqcount, |
2100 | vstream->stream->stream_handle); | |
9237e6a1 | 2101 | } |
d3e2ba59 | 2102 | end: |
7591bab1 MD |
2103 | if (metadata_viewer_stream) { |
2104 | viewer_stream_put(metadata_viewer_stream); | |
2105 | } | |
2106 | if (vstream) { | |
2107 | viewer_stream_put(vstream); | |
2108 | } | |
2109 | return ret; | |
2110 | ||
2111 | error_put: | |
2112 | pthread_mutex_unlock(&rstream->lock); | |
b6ae2a95 | 2113 | pthread_mutex_unlock(&rstream->trace->session->lock); |
7591bab1 MD |
2114 | if (metadata_viewer_stream) { |
2115 | viewer_stream_put(metadata_viewer_stream); | |
2116 | } | |
2117 | viewer_stream_put(vstream); | |
d3e2ba59 JD |
2118 | return ret; |
2119 | } | |
2120 | ||
2121 | /* | |
2122 | * Send the next index for a stream | |
2123 | * | |
2124 | * Return 0 on success or else a negative value. | |
2125 | */ | |
28ab034a | 2126 | static int viewer_get_packet(struct relay_connection *conn) |
d3e2ba59 | 2127 | { |
b6025e94 | 2128 | int ret; |
a5df8828 | 2129 | off_t lseek_ret; |
cd9adb8b | 2130 | char *reply = nullptr; |
d3e2ba59 | 2131 | struct lttng_viewer_get_packet get_packet_info; |
553b2adb | 2132 | struct lttng_viewer_trace_packet reply_header; |
cd9adb8b | 2133 | struct relay_viewer_stream *vstream = nullptr; |
553b2adb | 2134 | uint32_t reply_size = sizeof(reply_header); |
b6025e94 JR |
2135 | uint32_t packet_data_len = 0; |
2136 | ssize_t read_len; | |
8bb66c3c | 2137 | uint64_t stream_id; |
556d5fae | 2138 | enum lttng_viewer_get_packet_return_code get_packet_status; |
d3e2ba59 | 2139 | |
eea7556c | 2140 | health_code_update(); |
2f8f53af | 2141 | |
28ab034a | 2142 | ret = recv_request(conn->sock, &get_packet_info, sizeof(get_packet_info)); |
2f8f53af | 2143 | if (ret < 0) { |
d3e2ba59 JD |
2144 | goto end; |
2145 | } | |
eea7556c | 2146 | health_code_update(); |
d3e2ba59 | 2147 | |
0233a6a5 | 2148 | /* From this point on, the error label can be reached. */ |
553b2adb | 2149 | memset(&reply_header, 0, sizeof(reply_header)); |
8bb66c3c | 2150 | stream_id = (uint64_t) be64toh(get_packet_info.stream_id); |
0233a6a5 | 2151 | |
8bb66c3c | 2152 | vstream = viewer_stream_get_by_id(stream_id); |
7591bab1 | 2153 | if (!vstream) { |
556d5fae | 2154 | get_packet_status = LTTNG_VIEWER_GET_PACKET_ERR; |
28ab034a JG |
2155 | DBG("Client requested packet of unknown stream id %" PRIu64 ", returning status=%s", |
2156 | stream_id, | |
2157 | lttng_viewer_get_packet_return_code_str(get_packet_status)); | |
553b2adb | 2158 | goto send_reply_nolock; |
b6025e94 JR |
2159 | } else { |
2160 | packet_data_len = be32toh(get_packet_info.len); | |
553b2adb | 2161 | reply_size += packet_data_len; |
d3e2ba59 | 2162 | } |
2a174661 | 2163 | |
64803277 | 2164 | reply = zmalloc<char>(reply_size); |
553b2adb | 2165 | if (!reply) { |
556d5fae FD |
2166 | get_packet_status = LTTNG_VIEWER_GET_PACKET_ERR; |
2167 | PERROR("Falled to allocate reply, returning status=%s", | |
28ab034a | 2168 | lttng_viewer_get_packet_return_code_str(get_packet_status)); |
d3e2ba59 JD |
2169 | goto error; |
2170 | } | |
2171 | ||
b6025e94 | 2172 | pthread_mutex_lock(&vstream->stream->lock); |
28ab034a JG |
2173 | lseek_ret = fs_handle_seek( |
2174 | vstream->stream_file.handle, be64toh(get_packet_info.offset), SEEK_SET); | |
a5df8828 | 2175 | if (lseek_ret < 0) { |
556d5fae | 2176 | get_packet_status = LTTNG_VIEWER_GET_PACKET_ERR; |
8bb66c3c | 2177 | PERROR("Failed to seek file system handle of viewer stream %" PRIu64 |
28ab034a JG |
2178 | " to offset %" PRIu64 ", returning status=%s", |
2179 | stream_id, | |
2180 | (uint64_t) be64toh(get_packet_info.offset), | |
2181 | lttng_viewer_get_packet_return_code_str(get_packet_status)); | |
7591bab1 | 2182 | goto error; |
d3e2ba59 | 2183 | } |
28ab034a JG |
2184 | read_len = fs_handle_read( |
2185 | vstream->stream_file.handle, reply + sizeof(reply_header), packet_data_len); | |
b6025e94 | 2186 | if (read_len < packet_data_len) { |
556d5fae | 2187 | get_packet_status = LTTNG_VIEWER_GET_PACKET_ERR; |
8bb66c3c | 2188 | PERROR("Failed to read from file system handle of viewer stream id %" PRIu64 |
28ab034a JG |
2189 | ", offset: %" PRIu64 ", returning status=%s", |
2190 | stream_id, | |
556d5fae | 2191 | (uint64_t) be64toh(get_packet_info.offset), |
28ab034a | 2192 | lttng_viewer_get_packet_return_code_str(get_packet_status)); |
7591bab1 | 2193 | goto error; |
d3e2ba59 | 2194 | } |
556d5fae FD |
2195 | |
2196 | get_packet_status = LTTNG_VIEWER_GET_PACKET_OK; | |
553b2adb | 2197 | reply_header.len = htobe32(packet_data_len); |
d3e2ba59 JD |
2198 | goto send_reply; |
2199 | ||
2200 | error: | |
f28ecb10 JG |
2201 | /* No payload to send on error. */ |
2202 | reply_size = sizeof(reply_header); | |
d3e2ba59 JD |
2203 | |
2204 | send_reply: | |
7591bab1 MD |
2205 | if (vstream) { |
2206 | pthread_mutex_unlock(&vstream->stream->lock); | |
2207 | } | |
2208 | send_reply_nolock: | |
eea7556c MD |
2209 | |
2210 | health_code_update(); | |
2f8f53af | 2211 | |
556d5fae | 2212 | reply_header.status = htobe32(get_packet_status); |
553b2adb JG |
2213 | if (reply) { |
2214 | memcpy(reply, &reply_header, sizeof(reply_header)); | |
2215 | ret = send_response(conn->sock, reply, reply_size); | |
2216 | } else { | |
2217 | /* No reply to send. */ | |
28ab034a | 2218 | ret = send_response(conn->sock, &reply_header, reply_size); |
553b2adb JG |
2219 | } |
2220 | ||
b6025e94 | 2221 | health_code_update(); |
d3e2ba59 | 2222 | if (ret < 0) { |
b6025e94 | 2223 | PERROR("sendmsg of packet data failed"); |
7591bab1 | 2224 | goto end_free; |
d3e2ba59 | 2225 | } |
d3e2ba59 | 2226 | |
8bb66c3c | 2227 | DBG("Sent %u bytes for stream %" PRIu64, reply_size, stream_id); |
d3e2ba59 | 2228 | |
7591bab1 | 2229 | end_free: |
553b2adb | 2230 | free(reply); |
d3e2ba59 | 2231 | end: |
7591bab1 MD |
2232 | if (vstream) { |
2233 | viewer_stream_put(vstream); | |
2234 | } | |
d3e2ba59 JD |
2235 | return ret; |
2236 | } | |
2237 | ||
2238 | /* | |
2239 | * Send the session's metadata | |
2240 | * | |
2241 | * Return 0 on success else a negative value. | |
2242 | */ | |
28ab034a | 2243 | static int viewer_get_metadata(struct relay_connection *conn) |
d3e2ba59 JD |
2244 | { |
2245 | int ret = 0; | |
8bb66c3c | 2246 | int fd = -1; |
d3e2ba59 JD |
2247 | ssize_t read_len; |
2248 | uint64_t len = 0; | |
cd9adb8b | 2249 | char *data = nullptr; |
d3e2ba59 JD |
2250 | struct lttng_viewer_get_metadata request; |
2251 | struct lttng_viewer_metadata_packet reply; | |
cd9adb8b | 2252 | struct relay_viewer_stream *vstream = nullptr; |
55d3f5e5 | 2253 | bool dispose_of_stream = false; |
d3e2ba59 | 2254 | |
a0377dfe | 2255 | LTTNG_ASSERT(conn); |
d3e2ba59 | 2256 | |
eea7556c | 2257 | health_code_update(); |
2f8f53af | 2258 | |
58eb9381 | 2259 | ret = recv_request(conn->sock, &request, sizeof(request)); |
2f8f53af | 2260 | if (ret < 0) { |
d3e2ba59 JD |
2261 | goto end; |
2262 | } | |
eea7556c | 2263 | health_code_update(); |
d3e2ba59 | 2264 | |
53efb85a MD |
2265 | memset(&reply, 0, sizeof(reply)); |
2266 | ||
7591bab1 MD |
2267 | vstream = viewer_stream_get_by_id(be64toh(request.stream_id)); |
2268 | if (!vstream) { | |
3b463131 MD |
2269 | /* |
2270 | * The metadata stream can be closed by a CLOSE command | |
2271 | * just before we attach. It can also be closed by | |
2272 | * per-pid tracing during tracing. Therefore, it is | |
2273 | * possible that we cannot find this viewer stream. | |
2274 | * Reply back to the client with an error if we cannot | |
2275 | * find it. | |
2276 | */ | |
a44ca2ca | 2277 | DBG("Client requested metadata of unknown stream id %" PRIu64, |
28ab034a | 2278 | (uint64_t) be64toh(request.stream_id)); |
3b463131 | 2279 | reply.status = htobe32(LTTNG_VIEWER_METADATA_ERR); |
7591bab1 | 2280 | goto send_reply; |
d3e2ba59 | 2281 | } |
55d3f5e5 JG |
2282 | |
2283 | pthread_mutex_lock(&vstream->stream->trace->session->lock); | |
2284 | pthread_mutex_lock(&vstream->stream->trace->lock); | |
7591bab1 MD |
2285 | pthread_mutex_lock(&vstream->stream->lock); |
2286 | if (!vstream->stream->is_metadata) { | |
2287 | ERR("Invalid metadata stream"); | |
6763619c JD |
2288 | goto error; |
2289 | } | |
2290 | ||
b0d240a2 | 2291 | if (vstream->metadata_sent >= vstream->stream->metadata_received) { |
94f73d08 | 2292 | /* |
0359d56c | 2293 | * Clear feature resets the metadata_received to 0 until the |
b0d240a2 | 2294 | * same metadata is received again. |
94f73d08 | 2295 | */ |
c4e361a4 | 2296 | reply.status = htobe32(LTTNG_VIEWER_NO_NEW_METADATA); |
94f73d08 MD |
2297 | /* |
2298 | * The live viewer considers a closed 0 byte metadata stream as | |
2299 | * an error. | |
2300 | */ | |
55d3f5e5 | 2301 | dispose_of_stream = vstream->metadata_sent > 0 && vstream->stream->closed; |
d3e2ba59 JD |
2302 | goto send_reply; |
2303 | } | |
2304 | ||
ad8bec24 | 2305 | if (vstream->stream->trace_chunk && |
28ab034a JG |
2306 | !lttng_trace_chunk_ids_equal(conn->viewer_session->current_trace_chunk, |
2307 | vstream->stream->trace_chunk)) { | |
ad8bec24 JG |
2308 | /* A rotation has occurred on the relay stream. */ |
2309 | DBG("Metadata relay stream and viewer chunk ids differ"); | |
2310 | ||
28ab034a JG |
2311 | ret = viewer_session_set_trace_chunk_copy(conn->viewer_session, |
2312 | vstream->stream->trace_chunk); | |
ad8bec24 JG |
2313 | if (ret) { |
2314 | reply.status = htobe32(LTTNG_VIEWER_METADATA_ERR); | |
2315 | goto send_reply; | |
2316 | } | |
2317 | } | |
2318 | ||
87250ba1 | 2319 | if (conn->viewer_session->current_trace_chunk && |
28ab034a JG |
2320 | !lttng_trace_chunk_ids_equal(conn->viewer_session->current_trace_chunk, |
2321 | vstream->stream_file.trace_chunk)) { | |
ad8bec24 JG |
2322 | bool acquired_reference; |
2323 | ||
2324 | DBG("Viewer session and viewer stream chunk differ: " | |
98b82dfa | 2325 | "vsession chunk %p vstream chunk=%p", |
28ab034a JG |
2326 | conn->viewer_session->current_trace_chunk, |
2327 | vstream->stream_file.trace_chunk); | |
ad8bec24 | 2328 | lttng_trace_chunk_put(vstream->stream_file.trace_chunk); |
28ab034a JG |
2329 | acquired_reference = |
2330 | lttng_trace_chunk_get(conn->viewer_session->current_trace_chunk); | |
a0377dfe | 2331 | LTTNG_ASSERT(acquired_reference); |
28ab034a | 2332 | vstream->stream_file.trace_chunk = conn->viewer_session->current_trace_chunk; |
ad8bec24 JG |
2333 | viewer_stream_close_files(vstream); |
2334 | } | |
2335 | ||
b0d240a2 MD |
2336 | len = vstream->stream->metadata_received - vstream->metadata_sent; |
2337 | ||
87250ba1 | 2338 | if (!vstream->stream_file.trace_chunk) { |
55d3f5e5 JG |
2339 | if (vstream->stream->trace->session->connection_closed) { |
2340 | /* | |
2341 | * If the connection is closed, there is no way for the metadata stream | |
2342 | * to ever transition back to an active chunk. As such, signal to the viewer | |
2343 | * that there is no new metadata available. | |
2344 | * | |
2345 | * The stream can be disposed-of. On the next execution of this command, | |
2346 | * the relay daemon will reply with an error status since the stream can't | |
2347 | * be found. | |
2348 | */ | |
2349 | dispose_of_stream = true; | |
2350 | } | |
2351 | ||
87250ba1 JG |
2352 | reply.status = htobe32(LTTNG_VIEWER_NO_NEW_METADATA); |
2353 | len = 0; | |
2354 | goto send_reply; | |
28ab034a | 2355 | } else if (vstream->stream_file.trace_chunk && !vstream->stream_file.handle && len > 0) { |
87250ba1 JG |
2356 | /* |
2357 | * Either this is the first time the metadata file is read, or a | |
2358 | * rotation of the corresponding relay stream has occurred. | |
2359 | */ | |
8bb66c3c | 2360 | struct fs_handle *fs_handle; |
ebb29c10 JG |
2361 | char file_path[LTTNG_PATH_MAX]; |
2362 | enum lttng_trace_chunk_status status; | |
2363 | struct relay_stream *rstream = vstream->stream; | |
2364 | ||
2365 | ret = utils_stream_file_path(rstream->path_name, | |
28ab034a JG |
2366 | rstream->channel_name, |
2367 | rstream->tracefile_size, | |
2368 | vstream->current_tracefile_id, | |
cd9adb8b | 2369 | nullptr, |
28ab034a JG |
2370 | file_path, |
2371 | sizeof(file_path)); | |
d3e2ba59 JD |
2372 | if (ret < 0) { |
2373 | goto error; | |
2374 | } | |
ebb29c10 | 2375 | |
3ff5c5db MD |
2376 | /* |
2377 | * It is possible the the metadata file we are trying to open is | |
2378 | * missing if the stream has been closed (application exits with | |
2379 | * per-pid buffers) and a clear command has been performed. | |
2380 | */ | |
8bb66c3c | 2381 | status = lttng_trace_chunk_open_fs_handle( |
28ab034a | 2382 | vstream->stream_file.trace_chunk, file_path, O_RDONLY, 0, &fs_handle, true); |
ebb29c10 | 2383 | if (status != LTTNG_TRACE_CHUNK_STATUS_OK) { |
b0d240a2 MD |
2384 | if (status == LTTNG_TRACE_CHUNK_STATUS_NO_FILE) { |
2385 | reply.status = htobe32(LTTNG_VIEWER_NO_NEW_METADATA); | |
2386 | len = 0; | |
2387 | if (vstream->stream->closed) { | |
2388 | viewer_stream_put(vstream); | |
2389 | } | |
2390 | goto send_reply; | |
2391 | } | |
ebb29c10 | 2392 | PERROR("Failed to open metadata file for viewer stream"); |
d3e2ba59 JD |
2393 | goto error; |
2394 | } | |
8bb66c3c | 2395 | vstream->stream_file.handle = fs_handle; |
ad8bec24 JG |
2396 | |
2397 | if (vstream->metadata_sent != 0) { | |
2398 | /* | |
2399 | * The client does not expect to receive any metadata | |
2400 | * it has received and metadata files in successive | |
2401 | * chunks must be a strict superset of one another. | |
2402 | * | |
2403 | * Skip the first `metadata_sent` bytes to ensure | |
2404 | * they are not sent a second time to the client. | |
2405 | * | |
2406 | * Baring a block layer error or an internal error, | |
2407 | * this seek should not fail as | |
2408 | * `vstream->stream->metadata_received` is reset when | |
2409 | * a relay stream is rotated. If this is reached, it is | |
2410 | * safe to assume that | |
2411 | * `metadata_received` > `metadata_sent`. | |
2412 | */ | |
28ab034a JG |
2413 | const off_t seek_ret = |
2414 | fs_handle_seek(fs_handle, vstream->metadata_sent, SEEK_SET); | |
ad8bec24 JG |
2415 | |
2416 | if (seek_ret < 0) { | |
2417 | PERROR("Failed to seek metadata viewer stream file to `sent` position: pos = %" PRId64, | |
28ab034a | 2418 | vstream->metadata_sent); |
ad8bec24 JG |
2419 | reply.status = htobe32(LTTNG_VIEWER_METADATA_ERR); |
2420 | goto send_reply; | |
2421 | } | |
2422 | } | |
d3e2ba59 JD |
2423 | } |
2424 | ||
2425 | reply.len = htobe64(len); | |
64803277 | 2426 | data = zmalloc<char>(len); |
d3e2ba59 JD |
2427 | if (!data) { |
2428 | PERROR("viewer metadata zmalloc"); | |
2429 | goto error; | |
2430 | } | |
2431 | ||
8bb66c3c JG |
2432 | fd = fs_handle_get_fd(vstream->stream_file.handle); |
2433 | if (fd < 0) { | |
2434 | ERR("Failed to restore viewer stream file system handle"); | |
2435 | goto error; | |
2436 | } | |
2437 | read_len = lttng_read(fd, data, len); | |
2438 | fs_handle_put_fd(vstream->stream_file.handle); | |
2439 | fd = -1; | |
6cd525e8 | 2440 | if (read_len < len) { |
ad8bec24 JG |
2441 | if (read_len < 0) { |
2442 | PERROR("Failed to read metadata file"); | |
2443 | goto error; | |
2444 | } else { | |
2445 | /* | |
2446 | * A clear has been performed which prevents the relay | |
2447 | * from sending `len` bytes of metadata. | |
2448 | * | |
2449 | * It is important not to send any metadata if we | |
2450 | * couldn't read all the available metadata in one shot: | |
2451 | * sending partial metadata can cause the client to | |
2452 | * attempt to parse an incomplete (incoherent) metadata | |
2453 | * stream, which would result in an error. | |
2454 | */ | |
28ab034a JG |
2455 | const off_t seek_ret = |
2456 | fs_handle_seek(vstream->stream_file.handle, -read_len, SEEK_CUR); | |
ad8bec24 | 2457 | |
cfa1e2c2 | 2458 | DBG("Failed to read metadata: requested = %" PRIu64 ", got = %zd", |
28ab034a JG |
2459 | len, |
2460 | read_len); | |
ad8bec24 JG |
2461 | read_len = 0; |
2462 | len = 0; | |
2463 | if (seek_ret < 0) { | |
2464 | PERROR("Failed to restore metadata file position after partial read"); | |
2465 | ret = -1; | |
2466 | goto error; | |
2467 | } | |
2468 | } | |
d3e2ba59 | 2469 | } |
7591bab1 | 2470 | vstream->metadata_sent += read_len; |
c4e361a4 | 2471 | reply.status = htobe32(LTTNG_VIEWER_METADATA_OK); |
7591bab1 | 2472 | |
d3e2ba59 JD |
2473 | goto send_reply; |
2474 | ||
2475 | error: | |
c4e361a4 | 2476 | reply.status = htobe32(LTTNG_VIEWER_METADATA_ERR); |
d3e2ba59 JD |
2477 | |
2478 | send_reply: | |
eea7556c | 2479 | health_code_update(); |
7591bab1 MD |
2480 | if (vstream) { |
2481 | pthread_mutex_unlock(&vstream->stream->lock); | |
55d3f5e5 JG |
2482 | pthread_mutex_unlock(&vstream->stream->trace->lock); |
2483 | pthread_mutex_unlock(&vstream->stream->trace->session->lock); | |
7591bab1 | 2484 | } |
58eb9381 | 2485 | ret = send_response(conn->sock, &reply, sizeof(reply)); |
d3e2ba59 | 2486 | if (ret < 0) { |
7591bab1 | 2487 | goto end_free; |
d3e2ba59 | 2488 | } |
eea7556c | 2489 | health_code_update(); |
d3e2ba59 JD |
2490 | |
2491 | if (len > 0) { | |
58eb9381 | 2492 | ret = send_response(conn->sock, data, len); |
d3e2ba59 | 2493 | if (ret < 0) { |
7591bab1 | 2494 | goto end_free; |
d3e2ba59 JD |
2495 | } |
2496 | } | |
2497 | ||
28ab034a JG |
2498 | DBG("Sent %" PRIu64 " bytes of metadata for stream %" PRIu64, |
2499 | len, | |
2500 | (uint64_t) be64toh(request.stream_id)); | |
d3e2ba59 JD |
2501 | |
2502 | DBG("Metadata sent"); | |
2503 | ||
7591bab1 | 2504 | end_free: |
d3e2ba59 | 2505 | free(data); |
d3e2ba59 | 2506 | end: |
7591bab1 MD |
2507 | if (vstream) { |
2508 | viewer_stream_put(vstream); | |
55d3f5e5 JG |
2509 | if (dispose_of_stream) { |
2510 | /* | |
2511 | * Trigger the destruction of the viewer stream | |
2512 | * by releasing its global reference. | |
2513 | * | |
2514 | * The live viewers expect to receive a NO_NEW_METADATA | |
2515 | * status before a stream disappears, otherwise they abort the | |
2516 | * entire live connection when receiving an error status. | |
2517 | * | |
2518 | * On the next query for this stream, an error will be reported to the | |
2519 | * client. | |
2520 | */ | |
2521 | viewer_stream_put(vstream); | |
2522 | } | |
7591bab1 | 2523 | } |
55d3f5e5 | 2524 | |
d3e2ba59 JD |
2525 | return ret; |
2526 | } | |
2527 | ||
c3b7390b JD |
2528 | /* |
2529 | * Create a viewer session. | |
2530 | * | |
2531 | * Return 0 on success or else a negative value. | |
2532 | */ | |
28ab034a | 2533 | static int viewer_create_session(struct relay_connection *conn) |
c3b7390b JD |
2534 | { |
2535 | int ret; | |
2536 | struct lttng_viewer_create_session_response resp; | |
2537 | ||
53efb85a | 2538 | memset(&resp, 0, sizeof(resp)); |
c3b7390b | 2539 | resp.status = htobe32(LTTNG_VIEWER_CREATE_SESSION_OK); |
7591bab1 | 2540 | conn->viewer_session = viewer_session_create(); |
c3b7390b JD |
2541 | if (!conn->viewer_session) { |
2542 | ERR("Allocation viewer session"); | |
2543 | resp.status = htobe32(LTTNG_VIEWER_CREATE_SESSION_ERR); | |
2544 | goto send_reply; | |
2545 | } | |
c3b7390b JD |
2546 | |
2547 | send_reply: | |
2548 | health_code_update(); | |
2549 | ret = send_response(conn->sock, &resp, sizeof(resp)); | |
2550 | if (ret < 0) { | |
2551 | goto end; | |
2552 | } | |
2553 | health_code_update(); | |
2554 | ret = 0; | |
2555 | ||
2556 | end: | |
2557 | return ret; | |
2558 | } | |
2559 | ||
d62023be JD |
2560 | /* |
2561 | * Detach a viewer session. | |
2562 | * | |
2563 | * Return 0 on success or else a negative value. | |
2564 | */ | |
28ab034a | 2565 | static int viewer_detach_session(struct relay_connection *conn) |
d62023be JD |
2566 | { |
2567 | int ret; | |
2568 | struct lttng_viewer_detach_session_response response; | |
2569 | struct lttng_viewer_detach_session_request request; | |
cd9adb8b | 2570 | struct relay_session *session = nullptr; |
d62023be JD |
2571 | uint64_t viewer_session_to_close; |
2572 | ||
a0377dfe | 2573 | LTTNG_ASSERT(conn); |
d62023be JD |
2574 | |
2575 | health_code_update(); | |
2576 | ||
2577 | /* Receive the request from the connected client. */ | |
2578 | ret = recv_request(conn->sock, &request, sizeof(request)); | |
2579 | if (ret < 0) { | |
2580 | goto end; | |
2581 | } | |
2582 | viewer_session_to_close = be64toh(request.session_id); | |
2583 | ||
2584 | if (!conn->viewer_session) { | |
2585 | DBG("Client trying to detach before creating a live viewer session"); | |
2586 | response.status = htobe32(LTTNG_VIEWER_DETACH_SESSION_ERR); | |
2587 | goto send_reply; | |
2588 | } | |
2589 | ||
2590 | health_code_update(); | |
2591 | ||
2592 | memset(&response, 0, sizeof(response)); | |
2593 | DBG("Detaching from session ID %" PRIu64, viewer_session_to_close); | |
2594 | ||
2595 | session = session_get_by_id(be64toh(request.session_id)); | |
2596 | if (!session) { | |
28ab034a | 2597 | DBG("Relay session %" PRIu64 " not found", (uint64_t) be64toh(request.session_id)); |
d62023be JD |
2598 | response.status = htobe32(LTTNG_VIEWER_DETACH_SESSION_UNK); |
2599 | goto send_reply; | |
2600 | } | |
2601 | ||
2602 | ret = viewer_session_is_attached(conn->viewer_session, session); | |
2603 | if (ret != 1) { | |
2604 | DBG("Not attached to this session"); | |
2605 | response.status = htobe32(LTTNG_VIEWER_DETACH_SESSION_ERR); | |
2606 | goto send_reply_put; | |
2607 | } | |
2608 | ||
2609 | viewer_session_close_one_session(conn->viewer_session, session); | |
2610 | response.status = htobe32(LTTNG_VIEWER_DETACH_SESSION_OK); | |
2611 | DBG("Session %" PRIu64 " detached.", viewer_session_to_close); | |
2612 | ||
2613 | send_reply_put: | |
2614 | session_put(session); | |
2615 | ||
2616 | send_reply: | |
2617 | health_code_update(); | |
2618 | ret = send_response(conn->sock, &response, sizeof(response)); | |
2619 | if (ret < 0) { | |
2620 | goto end; | |
2621 | } | |
2622 | health_code_update(); | |
2623 | ret = 0; | |
2624 | ||
2625 | end: | |
2626 | return ret; | |
2627 | } | |
c3b7390b | 2628 | |
d3e2ba59 JD |
2629 | /* |
2630 | * live_relay_unknown_command: send -1 if received unknown command | |
2631 | */ | |
28ab034a | 2632 | static void live_relay_unknown_command(struct relay_connection *conn) |
d3e2ba59 JD |
2633 | { |
2634 | struct lttcomm_relayd_generic_reply reply; | |
d3e2ba59 | 2635 | |
53efb85a | 2636 | memset(&reply, 0, sizeof(reply)); |
d3e2ba59 | 2637 | reply.ret_code = htobe32(LTTNG_ERR_UNK); |
58eb9381 | 2638 | (void) send_response(conn->sock, &reply, sizeof(reply)); |
d3e2ba59 JD |
2639 | } |
2640 | ||
2641 | /* | |
2642 | * Process the commands received on the control socket | |
2643 | */ | |
28ab034a | 2644 | static int process_control(struct lttng_viewer_cmd *recv_hdr, struct relay_connection *conn) |
d3e2ba59 JD |
2645 | { |
2646 | int ret = 0; | |
07c4863f | 2647 | const lttng_viewer_command cmd = (lttng_viewer_command) be32toh(recv_hdr->cmd); |
2f8f53af DG |
2648 | |
2649 | /* | |
7201079f FD |
2650 | * Make sure we've done the version check before any command other then |
2651 | * a new client connection. | |
2f8f53af | 2652 | */ |
7201079f FD |
2653 | if (cmd != LTTNG_VIEWER_CONNECT && !conn->version_check_done) { |
2654 | ERR("Viewer on connection %d requested %s command before version check", | |
28ab034a JG |
2655 | conn->sock->fd, |
2656 | lttng_viewer_command_str(cmd)); | |
2f8f53af DG |
2657 | ret = -1; |
2658 | goto end; | |
2659 | } | |
d3e2ba59 | 2660 | |
7201079f | 2661 | DBG("Processing %s viewer command from connection %d", |
28ab034a JG |
2662 | lttng_viewer_command_str(cmd), |
2663 | conn->sock->fd); | |
7201079f FD |
2664 | |
2665 | switch (cmd) { | |
c4e361a4 | 2666 | case LTTNG_VIEWER_CONNECT: |
58eb9381 | 2667 | ret = viewer_connect(conn); |
d3e2ba59 | 2668 | break; |
c4e361a4 | 2669 | case LTTNG_VIEWER_LIST_SESSIONS: |
58eb9381 | 2670 | ret = viewer_list_sessions(conn); |
d3e2ba59 | 2671 | break; |
c4e361a4 | 2672 | case LTTNG_VIEWER_ATTACH_SESSION: |
58eb9381 | 2673 | ret = viewer_attach_session(conn); |
d3e2ba59 | 2674 | break; |
c4e361a4 | 2675 | case LTTNG_VIEWER_GET_NEXT_INDEX: |
58eb9381 | 2676 | ret = viewer_get_next_index(conn); |
d3e2ba59 | 2677 | break; |
c4e361a4 | 2678 | case LTTNG_VIEWER_GET_PACKET: |
58eb9381 | 2679 | ret = viewer_get_packet(conn); |
d3e2ba59 | 2680 | break; |
c4e361a4 | 2681 | case LTTNG_VIEWER_GET_METADATA: |
58eb9381 | 2682 | ret = viewer_get_metadata(conn); |
d3e2ba59 | 2683 | break; |
c4e361a4 | 2684 | case LTTNG_VIEWER_GET_NEW_STREAMS: |
58eb9381 | 2685 | ret = viewer_get_new_streams(conn); |
80e8027a | 2686 | break; |
c3b7390b JD |
2687 | case LTTNG_VIEWER_CREATE_SESSION: |
2688 | ret = viewer_create_session(conn); | |
2689 | break; | |
d62023be JD |
2690 | case LTTNG_VIEWER_DETACH_SESSION: |
2691 | ret = viewer_detach_session(conn); | |
2692 | break; | |
d3e2ba59 | 2693 | default: |
28ab034a | 2694 | ERR("Received unknown viewer command (%u)", be32toh(recv_hdr->cmd)); |
58eb9381 | 2695 | live_relay_unknown_command(conn); |
d3e2ba59 JD |
2696 | ret = -1; |
2697 | goto end; | |
2698 | } | |
2699 | ||
2700 | end: | |
2701 | return ret; | |
2702 | } | |
2703 | ||
28ab034a | 2704 | static void cleanup_connection_pollfd(struct lttng_poll_event *events, int pollfd) |
d3e2ba59 JD |
2705 | { |
2706 | int ret; | |
2707 | ||
58eb9381 | 2708 | (void) lttng_poll_del(events, pollfd); |
d3e2ba59 | 2709 | |
28ab034a | 2710 | ret = fd_tracker_close_unsuspendable_fd( |
cd9adb8b | 2711 | the_fd_tracker, &pollfd, 1, fd_tracker_util_close_fd, nullptr); |
d3e2ba59 JD |
2712 | if (ret < 0) { |
2713 | ERR("Closing pollfd %d", pollfd); | |
2714 | } | |
2715 | } | |
2716 | ||
d3e2ba59 JD |
2717 | /* |
2718 | * This thread does the actual work | |
2719 | */ | |
28ab034a | 2720 | static void *thread_worker(void *data __attribute__((unused))) |
d3e2ba59 JD |
2721 | { |
2722 | int ret, err = -1; | |
2723 | uint32_t nb_fd; | |
d3e2ba59 | 2724 | struct lttng_poll_event events; |
7591bab1 | 2725 | struct lttng_ht *viewer_connections_ht; |
d3e2ba59 | 2726 | struct lttng_viewer_cmd recv_hdr; |
d3e2ba59 JD |
2727 | |
2728 | DBG("[thread] Live viewer relay worker started"); | |
2729 | ||
2730 | rcu_register_thread(); | |
2731 | ||
eea7556c MD |
2732 | health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_WORKER); |
2733 | ||
9b5e0863 MD |
2734 | if (testpoint(relayd_thread_live_worker)) { |
2735 | goto error_testpoint; | |
2736 | } | |
2737 | ||
d3e2ba59 | 2738 | /* table of connections indexed on socket */ |
7591bab1 MD |
2739 | viewer_connections_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
2740 | if (!viewer_connections_ht) { | |
2741 | goto viewer_connections_ht_error; | |
d3e2ba59 JD |
2742 | } |
2743 | ||
28ab034a | 2744 | ret = create_named_thread_poll_set(&events, 2, "Live viewer worker thread epoll"); |
d3e2ba59 JD |
2745 | if (ret < 0) { |
2746 | goto error_poll_create; | |
2747 | } | |
2748 | ||
58eb9381 | 2749 | ret = lttng_poll_add(&events, live_conn_pipe[0], LPOLLIN | LPOLLRDHUP); |
d3e2ba59 JD |
2750 | if (ret < 0) { |
2751 | goto error; | |
2752 | } | |
2753 | ||
2754 | restart: | |
cd9adb8b | 2755 | while (true) { |
d3e2ba59 JD |
2756 | int i; |
2757 | ||
eea7556c MD |
2758 | health_code_update(); |
2759 | ||
d3e2ba59 JD |
2760 | /* Infinite blocking call, waiting for transmission */ |
2761 | DBG3("Relayd live viewer worker thread polling..."); | |
eea7556c | 2762 | health_poll_entry(); |
d3e2ba59 | 2763 | ret = lttng_poll_wait(&events, -1); |
eea7556c | 2764 | health_poll_exit(); |
d3e2ba59 JD |
2765 | if (ret < 0) { |
2766 | /* | |
2767 | * Restart interrupted system call. | |
2768 | */ | |
2769 | if (errno == EINTR) { | |
2770 | goto restart; | |
2771 | } | |
2772 | goto error; | |
2773 | } | |
2774 | ||
2775 | nb_fd = ret; | |
2776 | ||
2777 | /* | |
2778 | * Process control. The control connection is prioritised so we don't | |
2779 | * starve it with high throughput tracing data on the data | |
2780 | * connection. | |
2781 | */ | |
2782 | for (i = 0; i < nb_fd; i++) { | |
2783 | /* Fetch once the poll data */ | |
8a00688e MJ |
2784 | const auto revents = LTTNG_POLL_GETEV(&events, i); |
2785 | const auto pollfd = LTTNG_POLL_GETFD(&events, i); | |
d3e2ba59 | 2786 | |
eea7556c MD |
2787 | health_code_update(); |
2788 | ||
8a00688e MJ |
2789 | /* Activity on thread quit pipe, exiting. */ |
2790 | if (relayd_is_thread_quit_pipe(pollfd)) { | |
2791 | DBG("Activity on thread quit pipe"); | |
d3e2ba59 JD |
2792 | err = 0; |
2793 | goto exit; | |
2794 | } | |
2795 | ||
7591bab1 | 2796 | /* Inspect the relay conn pipe for new connection. */ |
58eb9381 | 2797 | if (pollfd == live_conn_pipe[0]) { |
03e43155 | 2798 | if (revents & LPOLLIN) { |
302d8906 JG |
2799 | struct relay_connection *conn; |
2800 | ||
5c7248cd JG |
2801 | ret = lttng_read(live_conn_pipe[0], |
2802 | &conn, | |
2803 | sizeof(conn)); /* NOLINT sizeof used on a | |
2804 | pointer. */ | |
d3e2ba59 JD |
2805 | if (ret < 0) { |
2806 | goto error; | |
2807 | } | |
28ab034a JG |
2808 | ret = lttng_poll_add( |
2809 | &events, conn->sock->fd, LPOLLIN | LPOLLRDHUP); | |
73039936 FD |
2810 | if (ret) { |
2811 | ERR("Failed to add new live connection file descriptor to poll set"); | |
2812 | goto error; | |
2813 | } | |
7591bab1 MD |
2814 | connection_ht_add(viewer_connections_ht, conn); |
2815 | DBG("Connection socket %d added to poll", conn->sock->fd); | |
03e43155 MD |
2816 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
2817 | ERR("Relay live pipe error"); | |
2818 | goto error; | |
2819 | } else { | |
28ab034a JG |
2820 | ERR("Unexpected poll events %u for sock %d", |
2821 | revents, | |
2822 | pollfd); | |
03e43155 | 2823 | goto error; |
d3e2ba59 | 2824 | } |
58eb9381 | 2825 | } else { |
7591bab1 | 2826 | /* Connection activity. */ |
302d8906 JG |
2827 | struct relay_connection *conn; |
2828 | ||
7591bab1 MD |
2829 | conn = connection_get_by_sock(viewer_connections_ht, pollfd); |
2830 | if (!conn) { | |
2831 | continue; | |
2832 | } | |
58eb9381 | 2833 | |
03e43155 | 2834 | if (revents & LPOLLIN) { |
28ab034a JG |
2835 | ret = conn->sock->ops->recvmsg( |
2836 | conn->sock, &recv_hdr, sizeof(recv_hdr), 0); | |
d3e2ba59 | 2837 | if (ret <= 0) { |
7591bab1 | 2838 | /* Connection closed. */ |
58eb9381 | 2839 | cleanup_connection_pollfd(&events, pollfd); |
7591bab1 MD |
2840 | /* Put "create" ownership reference. */ |
2841 | connection_put(conn); | |
58eb9381 | 2842 | DBG("Viewer control conn closed with %d", pollfd); |
d3e2ba59 | 2843 | } else { |
58eb9381 | 2844 | ret = process_control(&recv_hdr, conn); |
d3e2ba59 JD |
2845 | if (ret < 0) { |
2846 | /* Clear the session on error. */ | |
58eb9381 | 2847 | cleanup_connection_pollfd(&events, pollfd); |
7591bab1 MD |
2848 | /* Put "create" ownership reference. */ |
2849 | connection_put(conn); | |
28ab034a JG |
2850 | DBG("Viewer connection closed with %d", |
2851 | pollfd); | |
d3e2ba59 JD |
2852 | } |
2853 | } | |
03e43155 MD |
2854 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
2855 | cleanup_connection_pollfd(&events, pollfd); | |
2856 | /* Put "create" ownership reference. */ | |
2857 | connection_put(conn); | |
2858 | } else { | |
28ab034a JG |
2859 | ERR("Unexpected poll events %u for sock %d", |
2860 | revents, | |
2861 | pollfd); | |
03e43155 MD |
2862 | connection_put(conn); |
2863 | goto error; | |
d3e2ba59 | 2864 | } |
7591bab1 MD |
2865 | /* Put local "get_by_sock" reference. */ |
2866 | connection_put(conn); | |
d3e2ba59 JD |
2867 | } |
2868 | } | |
2869 | } | |
2870 | ||
2871 | exit: | |
2872 | error: | |
35bc1f58 | 2873 | (void) fd_tracker_util_poll_clean(the_fd_tracker, &events); |
d3e2ba59 | 2874 | |
71efa8ef | 2875 | /* Cleanup remaining connection object. */ |
d54688c6 JG |
2876 | for (auto *destroy_conn : |
2877 | lttng::urcu::lfht_iteration_adapter<relay_connection, | |
2878 | decltype(relay_connection::sock_n), | |
2879 | &relay_connection::sock_n>( | |
2880 | *viewer_connections_ht->ht)) { | |
2881 | health_code_update(); | |
2882 | connection_put(destroy_conn); | |
d3e2ba59 | 2883 | } |
d54688c6 | 2884 | |
d3e2ba59 | 2885 | error_poll_create: |
7591bab1 MD |
2886 | lttng_ht_destroy(viewer_connections_ht); |
2887 | viewer_connections_ht_error: | |
58eb9381 | 2888 | /* Close relay conn pipes */ |
87bcbe91 | 2889 | (void) fd_tracker_util_pipe_close(the_fd_tracker, live_conn_pipe); |
d3e2ba59 JD |
2890 | if (err) { |
2891 | DBG("Viewer worker thread exited with error"); | |
2892 | } | |
2893 | DBG("Viewer worker thread cleanup complete"); | |
9b5e0863 | 2894 | error_testpoint: |
eea7556c MD |
2895 | if (err) { |
2896 | health_error(); | |
2897 | ERR("Health error occurred in %s", __func__); | |
2898 | } | |
2899 | health_unregister(health_relayd); | |
b4aacfdc MD |
2900 | if (lttng_relay_stop_threads()) { |
2901 | ERR("Error stopping threads"); | |
178a0557 | 2902 | } |
d3e2ba59 | 2903 | rcu_unregister_thread(); |
cd9adb8b | 2904 | return nullptr; |
d3e2ba59 JD |
2905 | } |
2906 | ||
2907 | /* | |
2908 | * Create the relay command pipe to wake thread_manage_apps. | |
2909 | * Closed in cleanup(). | |
2910 | */ | |
cd9adb8b | 2911 | static int create_conn_pipe() |
d3e2ba59 | 2912 | { |
28ab034a JG |
2913 | return fd_tracker_util_pipe_open_cloexec( |
2914 | the_fd_tracker, "Live connection pipe", live_conn_pipe); | |
178a0557 | 2915 | } |
d3e2ba59 | 2916 | |
cd9adb8b | 2917 | int relayd_live_join() |
d3e2ba59 | 2918 | { |
178a0557 | 2919 | int ret, retval = 0; |
d3e2ba59 JD |
2920 | void *status; |
2921 | ||
d3e2ba59 | 2922 | ret = pthread_join(live_listener_thread, &status); |
178a0557 MD |
2923 | if (ret) { |
2924 | errno = ret; | |
d3e2ba59 | 2925 | PERROR("pthread_join live listener"); |
178a0557 | 2926 | retval = -1; |
d3e2ba59 JD |
2927 | } |
2928 | ||
2929 | ret = pthread_join(live_worker_thread, &status); | |
178a0557 MD |
2930 | if (ret) { |
2931 | errno = ret; | |
d3e2ba59 | 2932 | PERROR("pthread_join live worker"); |
178a0557 | 2933 | retval = -1; |
d3e2ba59 JD |
2934 | } |
2935 | ||
2936 | ret = pthread_join(live_dispatcher_thread, &status); | |
178a0557 MD |
2937 | if (ret) { |
2938 | errno = ret; | |
d3e2ba59 | 2939 | PERROR("pthread_join live dispatcher"); |
178a0557 | 2940 | retval = -1; |
d3e2ba59 JD |
2941 | } |
2942 | ||
178a0557 | 2943 | cleanup_relayd_live(); |
d3e2ba59 | 2944 | |
178a0557 | 2945 | return retval; |
d3e2ba59 JD |
2946 | } |
2947 | ||
2948 | /* | |
2949 | * main | |
2950 | */ | |
7591bab1 | 2951 | int relayd_live_create(struct lttng_uri *uri) |
d3e2ba59 | 2952 | { |
178a0557 | 2953 | int ret = 0, retval = 0; |
d3e2ba59 JD |
2954 | void *status; |
2955 | int is_root; | |
2956 | ||
178a0557 MD |
2957 | if (!uri) { |
2958 | retval = -1; | |
2959 | goto exit_init_data; | |
2960 | } | |
d3e2ba59 JD |
2961 | live_uri = uri; |
2962 | ||
d3e2ba59 JD |
2963 | /* Check if daemon is UID = 0 */ |
2964 | is_root = !getuid(); | |
2965 | ||
2966 | if (!is_root) { | |
2967 | if (live_uri->port < 1024) { | |
2968 | ERR("Need to be root to use ports < 1024"); | |
178a0557 MD |
2969 | retval = -1; |
2970 | goto exit_init_data; | |
d3e2ba59 JD |
2971 | } |
2972 | } | |
2973 | ||
2974 | /* Setup the thread apps communication pipe. */ | |
178a0557 MD |
2975 | if (create_conn_pipe()) { |
2976 | retval = -1; | |
2977 | goto exit_init_data; | |
d3e2ba59 JD |
2978 | } |
2979 | ||
2980 | /* Init relay command queue. */ | |
8bdee6e2 | 2981 | cds_wfcq_init(&viewer_conn_queue.head, &viewer_conn_queue.tail); |
d3e2ba59 JD |
2982 | |
2983 | /* Set up max poll set size */ | |
25b397f9 MD |
2984 | if (lttng_poll_set_max_size()) { |
2985 | retval = -1; | |
2986 | goto exit_init_data; | |
2987 | } | |
d3e2ba59 JD |
2988 | |
2989 | /* Setup the dispatcher thread */ | |
cd9adb8b JG |
2990 | ret = pthread_create(&live_dispatcher_thread, |
2991 | default_pthread_attr(), | |
2992 | thread_dispatcher, | |
2993 | (void *) nullptr); | |
178a0557 MD |
2994 | if (ret) { |
2995 | errno = ret; | |
d3e2ba59 | 2996 | PERROR("pthread_create viewer dispatcher"); |
178a0557 MD |
2997 | retval = -1; |
2998 | goto exit_dispatcher_thread; | |
d3e2ba59 JD |
2999 | } |
3000 | ||
3001 | /* Setup the worker thread */ | |
cd9adb8b | 3002 | ret = pthread_create(&live_worker_thread, default_pthread_attr(), thread_worker, nullptr); |
178a0557 MD |
3003 | if (ret) { |
3004 | errno = ret; | |
d3e2ba59 | 3005 | PERROR("pthread_create viewer worker"); |
178a0557 MD |
3006 | retval = -1; |
3007 | goto exit_worker_thread; | |
d3e2ba59 JD |
3008 | } |
3009 | ||
3010 | /* Setup the listener thread */ | |
28ab034a | 3011 | ret = pthread_create( |
cd9adb8b | 3012 | &live_listener_thread, default_pthread_attr(), thread_listener, (void *) nullptr); |
178a0557 MD |
3013 | if (ret) { |
3014 | errno = ret; | |
d3e2ba59 | 3015 | PERROR("pthread_create viewer listener"); |
178a0557 MD |
3016 | retval = -1; |
3017 | goto exit_listener_thread; | |
d3e2ba59 JD |
3018 | } |
3019 | ||
178a0557 MD |
3020 | /* |
3021 | * All OK, started all threads. | |
3022 | */ | |
3023 | return retval; | |
3024 | ||
9911d21b JG |
3025 | /* |
3026 | * Join on the live_listener_thread should anything be added after | |
3027 | * the live_listener thread's creation. | |
3028 | */ | |
d3e2ba59 | 3029 | |
178a0557 | 3030 | exit_listener_thread: |
d3e2ba59 | 3031 | |
d3e2ba59 | 3032 | ret = pthread_join(live_worker_thread, &status); |
178a0557 MD |
3033 | if (ret) { |
3034 | errno = ret; | |
d3e2ba59 | 3035 | PERROR("pthread_join live worker"); |
178a0557 | 3036 | retval = -1; |
d3e2ba59 | 3037 | } |
178a0557 | 3038 | exit_worker_thread: |
d3e2ba59 | 3039 | |
d3e2ba59 | 3040 | ret = pthread_join(live_dispatcher_thread, &status); |
178a0557 MD |
3041 | if (ret) { |
3042 | errno = ret; | |
d3e2ba59 | 3043 | PERROR("pthread_join live dispatcher"); |
178a0557 | 3044 | retval = -1; |
d3e2ba59 | 3045 | } |
178a0557 | 3046 | exit_dispatcher_thread: |
d3e2ba59 | 3047 | |
178a0557 MD |
3048 | exit_init_data: |
3049 | cleanup_relayd_live(); | |
d3e2ba59 | 3050 | |
178a0557 | 3051 | return retval; |
d3e2ba59 | 3052 | } |