4 * Babeltrace CTF LTTng-live Client Component
6 * Copyright 2019 Francis Deslauriers <francis.deslauriers@efficios.com>
7 * Copyright 2016 Jérémie Galarneau <jeremie.galarneau@efficios.com>
8 * Copyright 2016 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
10 * Author: Jérémie Galarneau <jeremie.galarneau@efficios.com>
12 * Permission is hereby granted, free of charge, to any person obtaining a copy
13 * of this software and associated documentation files (the "Software"), to deal
14 * in the Software without restriction, including without limitation the rights
15 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
16 * copies of the Software, and to permit persons to whom the Software is
17 * furnished to do so, subject to the following conditions:
19 * The above copyright notice and this permission notice shall be included in
20 * all copies or substantial portions of the Software.
22 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
23 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
24 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
25 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
26 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
27 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
31 #define BT_COMP_LOG_SELF_COMP self_comp
32 #define BT_LOG_OUTPUT_LEVEL log_level
33 #define BT_LOG_TAG "PLUGIN/SRC.CTF.LTTNG-LIVE"
34 #include "logging/comp-logging.h"
42 #include "common/assert.h"
43 #include <babeltrace2/babeltrace.h>
44 #include "compat/compiler.h"
45 #include <babeltrace2/types.h>
47 #include "plugins/common/muxing/muxing.h"
48 #include "plugins/common/param-validation/param-validation.h"
50 #include "data-stream.h"
52 #include "lttng-live.h"
54 #define MAX_QUERY_SIZE (256*1024)
55 #define URL_PARAM "url"
56 #define INPUTS_PARAM "inputs"
57 #define SESS_NOT_FOUND_ACTION_PARAM "session-not-found-action"
58 #define SESS_NOT_FOUND_ACTION_CONTINUE_STR "continue"
59 #define SESS_NOT_FOUND_ACTION_FAIL_STR "fail"
60 #define SESS_NOT_FOUND_ACTION_END_STR "end"
62 #define print_dbg(fmt, ...) BT_COMP_LOGD(fmt, ## __VA_ARGS__)
65 const char *print_live_iterator_status(enum lttng_live_iterator_status status
)
68 case LTTNG_LIVE_ITERATOR_STATUS_CONTINUE
:
69 return "LTTNG_LIVE_ITERATOR_STATUS_CONTINUE";
70 case LTTNG_LIVE_ITERATOR_STATUS_AGAIN
:
71 return "LTTNG_LIVE_ITERATOR_STATUS_AGAIN";
72 case LTTNG_LIVE_ITERATOR_STATUS_END
:
73 return "LTTNG_LIVE_ITERATOR_STATUS_END";
74 case LTTNG_LIVE_ITERATOR_STATUS_OK
:
75 return "LTTNG_LIVE_ITERATOR_STATUS_OK";
76 case LTTNG_LIVE_ITERATOR_STATUS_INVAL
:
77 return "LTTNG_LIVE_ITERATOR_STATUS_INVAL";
78 case LTTNG_LIVE_ITERATOR_STATUS_ERROR
:
79 return "LTTNG_LIVE_ITERATOR_STATUS_ERROR";
80 case LTTNG_LIVE_ITERATOR_STATUS_NOMEM
:
81 return "LTTNG_LIVE_ITERATOR_STATUS_NOMEM";
82 case LTTNG_LIVE_ITERATOR_STATUS_UNSUPPORTED
:
83 return "LTTNG_LIVE_ITERATOR_STATUS_UNSUPPORTED";
90 const char *print_state(struct lttng_live_stream_iterator
*s
)
93 case LTTNG_LIVE_STREAM_ACTIVE_NO_DATA
:
94 return "ACTIVE_NO_DATA";
95 case LTTNG_LIVE_STREAM_QUIESCENT_NO_DATA
:
96 return "QUIESCENT_NO_DATA";
97 case LTTNG_LIVE_STREAM_QUIESCENT
:
99 case LTTNG_LIVE_STREAM_ACTIVE_DATA
:
100 return "ACTIVE_DATA";
101 case LTTNG_LIVE_STREAM_EOF
:
108 #define print_stream_state(live_stream_iter) \
110 BT_COMP_LOGD("stream state %s last_inact_ts %" PRId64 \
111 ", curr_inact_ts %" PRId64, \
112 print_state(live_stream_iter), \
113 live_stream_iter->last_inactivity_ts, \
114 live_stream_iter->current_inactivity_ts); \
118 bool lttng_live_graph_is_canceled(struct lttng_live_msg_iter
*msg_iter
)
127 ret
= bt_self_message_iterator_is_interrupted(
128 msg_iter
->self_msg_iter
);
135 struct lttng_live_trace
*lttng_live_find_trace(struct lttng_live_session
*session
,
139 struct lttng_live_trace
*ret_trace
= NULL
;
141 for (trace_idx
= 0; trace_idx
< session
->traces
->len
; trace_idx
++) {
142 struct lttng_live_trace
*trace
=
143 g_ptr_array_index(session
->traces
, trace_idx
);
144 if (trace
->id
== trace_id
) {
155 void lttng_live_destroy_trace(struct lttng_live_trace
*trace
)
157 bt_logging_level log_level
= trace
->log_level
;
158 bt_self_component
*self_comp
= trace
->self_comp
;
160 BT_COMP_LOGD("Destroy lttng_live_trace");
162 BT_ASSERT(trace
->stream_iterators
);
163 g_ptr_array_free(trace
->stream_iterators
, TRUE
);
165 BT_TRACE_PUT_REF_AND_RESET(trace
->trace
);
166 BT_TRACE_CLASS_PUT_REF_AND_RESET(trace
->trace_class
);
168 lttng_live_metadata_fini(trace
);
173 struct lttng_live_trace
*lttng_live_create_trace(struct lttng_live_session
*session
,
176 struct lttng_live_trace
*trace
= NULL
;
177 bt_logging_level log_level
= session
->log_level
;
178 bt_self_component
*self_comp
= session
->self_comp
;
180 trace
= g_new0(struct lttng_live_trace
, 1);
182 BT_COMP_LOGE_APPEND_CAUSE(self_comp
,
183 "Failed to allocate live trace");
186 trace
->log_level
= session
->log_level
;
187 trace
->self_comp
= session
->self_comp
;
188 trace
->session
= session
;
189 trace
->id
= trace_id
;
190 trace
->trace_class
= NULL
;
192 trace
->stream_iterators
= g_ptr_array_new_with_free_func(
193 (GDestroyNotify
) lttng_live_stream_iterator_destroy
);
194 BT_ASSERT(trace
->stream_iterators
);
195 trace
->new_metadata_needed
= true;
196 g_ptr_array_add(session
->traces
, trace
);
198 BT_COMP_LOGI("Create trace");
208 struct lttng_live_trace
*lttng_live_borrow_trace(
209 struct lttng_live_session
*session
, uint64_t trace_id
)
211 struct lttng_live_trace
*trace
;
213 trace
= lttng_live_find_trace(session
, trace_id
);
218 /* The session is the owner of the newly created trace. */
219 trace
= lttng_live_create_trace(session
, trace_id
);
226 int lttng_live_add_session(struct lttng_live_msg_iter
*lttng_live_msg_iter
,
227 uint64_t session_id
, const char *hostname
,
228 const char *session_name
)
231 struct lttng_live_session
*session
;
232 bt_logging_level log_level
= lttng_live_msg_iter
->log_level
;
233 bt_self_component
*self_comp
= lttng_live_msg_iter
->self_comp
;
235 session
= g_new0(struct lttng_live_session
, 1);
237 BT_COMP_LOGE_APPEND_CAUSE(self_comp
,
238 "Failed to allocate live session");
242 session
->log_level
= lttng_live_msg_iter
->log_level
;
243 session
->self_comp
= lttng_live_msg_iter
->self_comp
;
244 session
->id
= session_id
;
245 session
->traces
= g_ptr_array_new_with_free_func(
246 (GDestroyNotify
) lttng_live_destroy_trace
);
247 BT_ASSERT(session
->traces
);
248 session
->lttng_live_msg_iter
= lttng_live_msg_iter
;
249 session
->new_streams_needed
= true;
250 session
->hostname
= g_string_new(hostname
);
251 BT_ASSERT(session
->hostname
);
253 session
->session_name
= g_string_new(session_name
);
254 BT_ASSERT(session
->session_name
);
256 BT_COMP_LOGI("Reading from session: %" PRIu64
" hostname: %s session_name: %s",
257 session
->id
, hostname
, session_name
);
258 g_ptr_array_add(lttng_live_msg_iter
->sessions
, session
);
268 void lttng_live_destroy_session(struct lttng_live_session
*session
)
270 bt_logging_level log_level
;
271 bt_self_component
*self_comp
;
277 log_level
= session
->log_level
;
278 self_comp
= session
->self_comp
;
279 BT_COMP_LOGD("Destroy lttng live session");
280 if (session
->id
!= -1ULL) {
281 if (lttng_live_detach_session(session
)) {
282 if (!lttng_live_graph_is_canceled(
283 session
->lttng_live_msg_iter
)) {
284 /* Old relayd cannot detach sessions. */
285 BT_COMP_LOGD("Unable to detach lttng live session %" PRIu64
,
292 if (session
->traces
) {
293 g_ptr_array_free(session
->traces
, TRUE
);
296 if (session
->hostname
) {
297 g_string_free(session
->hostname
, TRUE
);
299 if (session
->session_name
) {
300 g_string_free(session
->session_name
, TRUE
);
309 void lttng_live_msg_iter_destroy(struct lttng_live_msg_iter
*lttng_live_msg_iter
)
311 if (!lttng_live_msg_iter
) {
315 if (lttng_live_msg_iter
->sessions
) {
316 g_ptr_array_free(lttng_live_msg_iter
->sessions
, TRUE
);
319 if (lttng_live_msg_iter
->viewer_connection
) {
320 live_viewer_connection_destroy(lttng_live_msg_iter
->viewer_connection
);
322 BT_ASSERT(lttng_live_msg_iter
->lttng_live_comp
);
323 BT_ASSERT(lttng_live_msg_iter
->lttng_live_comp
->has_msg_iter
);
325 /* All stream iterators must be destroyed at this point. */
326 BT_ASSERT(lttng_live_msg_iter
->active_stream_iter
== 0);
327 lttng_live_msg_iter
->lttng_live_comp
->has_msg_iter
= false;
329 g_free(lttng_live_msg_iter
);
336 void lttng_live_msg_iter_finalize(bt_self_message_iterator
*self_msg_iter
)
338 struct lttng_live_msg_iter
*lttng_live_msg_iter
;
340 BT_ASSERT(self_msg_iter
);
342 lttng_live_msg_iter
= bt_self_message_iterator_get_data(self_msg_iter
);
343 BT_ASSERT(lttng_live_msg_iter
);
344 lttng_live_msg_iter_destroy(lttng_live_msg_iter
);
348 enum lttng_live_iterator_status
lttng_live_iterator_next_check_stream_state(
349 struct lttng_live_stream_iterator
*lttng_live_stream
)
351 bt_logging_level log_level
= lttng_live_stream
->log_level
;
352 bt_self_component
*self_comp
= lttng_live_stream
->self_comp
;
354 switch (lttng_live_stream
->state
) {
355 case LTTNG_LIVE_STREAM_QUIESCENT
:
356 case LTTNG_LIVE_STREAM_ACTIVE_DATA
:
358 case LTTNG_LIVE_STREAM_ACTIVE_NO_DATA
:
360 BT_COMP_LOGF("Unexpected stream state \"ACTIVE_NO_DATA\"");
362 case LTTNG_LIVE_STREAM_QUIESCENT_NO_DATA
:
364 BT_COMP_LOGF("Unexpected stream state \"QUIESCENT_NO_DATA\"");
366 case LTTNG_LIVE_STREAM_EOF
:
369 return LTTNG_LIVE_ITERATOR_STATUS_OK
;
373 * For active no data stream, fetch next data. It can be either:
374 * - quiescent: need to put it in the prio heap at quiescent end
376 * - have data: need to wire up first event into the prio heap,
377 * - have no data on this stream at this point: need to retry (AGAIN) or
381 enum lttng_live_iterator_status
lttng_live_iterator_next_handle_one_no_data_stream(
382 struct lttng_live_msg_iter
*lttng_live_msg_iter
,
383 struct lttng_live_stream_iterator
*lttng_live_stream
)
385 bt_logging_level log_level
= lttng_live_msg_iter
->log_level
;
386 bt_self_component
*self_comp
= lttng_live_msg_iter
->self_comp
;
387 enum lttng_live_iterator_status ret
= LTTNG_LIVE_ITERATOR_STATUS_OK
;
388 enum lttng_live_stream_state orig_state
= lttng_live_stream
->state
;
389 struct packet_index index
;
391 if (lttng_live_stream
->trace
->new_metadata_needed
) {
392 ret
= LTTNG_LIVE_ITERATOR_STATUS_CONTINUE
;
395 if (lttng_live_stream
->trace
->session
->new_streams_needed
) {
396 ret
= LTTNG_LIVE_ITERATOR_STATUS_CONTINUE
;
399 if (lttng_live_stream
->state
!= LTTNG_LIVE_STREAM_ACTIVE_NO_DATA
&&
400 lttng_live_stream
->state
!= LTTNG_LIVE_STREAM_QUIESCENT_NO_DATA
) {
403 ret
= lttng_live_get_next_index(lttng_live_msg_iter
, lttng_live_stream
,
405 if (ret
!= LTTNG_LIVE_ITERATOR_STATUS_OK
) {
408 BT_ASSERT_DBG(lttng_live_stream
->state
!= LTTNG_LIVE_STREAM_EOF
);
409 if (lttng_live_stream
->state
== LTTNG_LIVE_STREAM_QUIESCENT
) {
410 uint64_t last_inact_ts
= lttng_live_stream
->last_inactivity_ts
,
411 curr_inact_ts
= lttng_live_stream
->current_inactivity_ts
;
413 if (orig_state
== LTTNG_LIVE_STREAM_QUIESCENT_NO_DATA
&&
414 last_inact_ts
== curr_inact_ts
) {
415 ret
= LTTNG_LIVE_ITERATOR_STATUS_AGAIN
;
416 print_stream_state(lttng_live_stream
);
418 ret
= LTTNG_LIVE_ITERATOR_STATUS_CONTINUE
;
422 lttng_live_stream
->base_offset
= index
.offset
;
423 lttng_live_stream
->offset
= index
.offset
;
424 lttng_live_stream
->len
= index
.packet_size
/ CHAR_BIT
;
426 if (ret
== LTTNG_LIVE_ITERATOR_STATUS_OK
) {
427 ret
= lttng_live_iterator_next_check_stream_state(lttng_live_stream
);
433 * Creation of the message requires the ctf trace class to be created
434 * beforehand, but the live protocol gives us all streams (including metadata)
435 * at once. So we split it in three steps: getting streams, getting metadata
436 * (which creates the ctf trace class), and then creating the per-stream
440 enum lttng_live_iterator_status
lttng_live_get_session(
441 struct lttng_live_msg_iter
*lttng_live_msg_iter
,
442 struct lttng_live_session
*session
)
444 bt_logging_level log_level
= lttng_live_msg_iter
->log_level
;
445 bt_self_component
*self_comp
= lttng_live_msg_iter
->self_comp
;
446 enum lttng_live_iterator_status status
;
449 if (!session
->attached
) {
450 enum lttng_live_viewer_status attach_status
=
451 lttng_live_attach_session(session
,
452 lttng_live_msg_iter
->self_msg_iter
);
453 if (attach_status
!= LTTNG_LIVE_VIEWER_STATUS_OK
) {
454 if (lttng_live_graph_is_canceled(lttng_live_msg_iter
)) {
456 * Clear any causes appended in
457 * `lttng_live_attach_session()` as we want to
458 * return gracefully since the graph was
461 bt_current_thread_clear_error();
462 status
= LTTNG_LIVE_ITERATOR_STATUS_AGAIN
;
464 status
= LTTNG_LIVE_ITERATOR_STATUS_ERROR
;
465 BT_COMP_LOGE_APPEND_CAUSE(self_comp
,
466 "Error attaching to LTTng live session");
472 status
= lttng_live_get_new_streams(session
,
473 lttng_live_msg_iter
->self_msg_iter
);
474 if (status
!= LTTNG_LIVE_ITERATOR_STATUS_OK
&&
475 status
!= LTTNG_LIVE_ITERATOR_STATUS_END
) {
479 while (trace_idx
< session
->traces
->len
) {
480 struct lttng_live_trace
*trace
=
481 g_ptr_array_index(session
->traces
, trace_idx
);
483 status
= lttng_live_metadata_update(trace
);
485 case LTTNG_LIVE_ITERATOR_STATUS_OK
:
488 case LTTNG_LIVE_ITERATOR_STATUS_END
:
490 * The trace has ended. Remove it of the array an
491 * continue the iteration.
492 * We can remove the trace safely when using the
493 * g_ptr_array_remove_index_fast because it replaces
494 * the element at trace_idx with the array's last
495 * element. trace_idx is not incremented because of
498 (void) g_ptr_array_remove_index_fast(session
->traces
,
505 status
= lttng_live_lazy_msg_init(session
,
506 lttng_live_msg_iter
->self_msg_iter
);
513 void lttng_live_need_new_streams(struct lttng_live_msg_iter
*lttng_live_msg_iter
)
515 uint64_t session_idx
;
517 for (session_idx
= 0; session_idx
< lttng_live_msg_iter
->sessions
->len
;
519 struct lttng_live_session
*session
=
520 g_ptr_array_index(lttng_live_msg_iter
->sessions
, session_idx
);
521 session
->new_streams_needed
= true;
526 void lttng_live_force_new_streams_and_metadata(struct lttng_live_msg_iter
*lttng_live_msg_iter
)
528 uint64_t session_idx
, trace_idx
;
530 for (session_idx
= 0; session_idx
< lttng_live_msg_iter
->sessions
->len
;
532 struct lttng_live_session
*session
=
533 g_ptr_array_index(lttng_live_msg_iter
->sessions
, session_idx
);
534 session
->new_streams_needed
= true;
535 for (trace_idx
= 0; trace_idx
< session
->traces
->len
;
537 struct lttng_live_trace
*trace
=
538 g_ptr_array_index(session
->traces
, trace_idx
);
539 trace
->new_metadata_needed
= true;
545 enum lttng_live_iterator_status
546 lttng_live_iterator_handle_new_streams_and_metadata(
547 struct lttng_live_msg_iter
*lttng_live_msg_iter
)
549 enum lttng_live_iterator_status status
;
550 enum lttng_live_viewer_status viewer_status
;
551 bt_logging_level log_level
= lttng_live_msg_iter
->log_level
;
552 bt_self_component
*self_comp
= lttng_live_msg_iter
->self_comp
;
553 uint64_t session_idx
= 0, nr_sessions_opened
= 0;
554 struct lttng_live_session
*session
;
555 enum session_not_found_action sess_not_found_act
=
556 lttng_live_msg_iter
->lttng_live_comp
->params
.sess_not_found_act
;
559 * In a remotely distant future, we could add a "new
560 * session" flag to the protocol, which would tell us that we
561 * need to query for new sessions even though we have sessions
564 if (lttng_live_msg_iter
->sessions
->len
== 0) {
565 if (sess_not_found_act
!= SESSION_NOT_FOUND_ACTION_CONTINUE
) {
566 status
= LTTNG_LIVE_ITERATOR_STATUS_END
;
570 * Retry to create a viewer session for the requested
573 viewer_status
= lttng_live_create_viewer_session(lttng_live_msg_iter
);
574 if (viewer_status
!= LTTNG_LIVE_VIEWER_STATUS_OK
) {
575 if (viewer_status
== LTTNG_LIVE_VIEWER_STATUS_ERROR
) {
576 status
= LTTNG_LIVE_ITERATOR_STATUS_ERROR
;
577 BT_COMP_LOGE_APPEND_CAUSE(self_comp
,
578 "Error creating LTTng live viewer session");
579 } else if (viewer_status
== LTTNG_LIVE_VIEWER_STATUS_INTERRUPTED
) {
580 status
= LTTNG_LIVE_ITERATOR_STATUS_AGAIN
;
589 for (session_idx
= 0; session_idx
< lttng_live_msg_iter
->sessions
->len
;
591 session
= g_ptr_array_index(lttng_live_msg_iter
->sessions
,
593 status
= lttng_live_get_session(lttng_live_msg_iter
, session
);
595 case LTTNG_LIVE_ITERATOR_STATUS_OK
:
597 case LTTNG_LIVE_ITERATOR_STATUS_END
:
598 status
= LTTNG_LIVE_ITERATOR_STATUS_OK
;
603 if (!session
->closed
) {
604 nr_sessions_opened
++;
608 if (sess_not_found_act
!= SESSION_NOT_FOUND_ACTION_CONTINUE
&&
609 nr_sessions_opened
== 0) {
610 status
= LTTNG_LIVE_ITERATOR_STATUS_END
;
612 status
= LTTNG_LIVE_ITERATOR_STATUS_OK
;
620 enum lttng_live_iterator_status
emit_inactivity_message(
621 struct lttng_live_msg_iter
*lttng_live_msg_iter
,
622 struct lttng_live_stream_iterator
*stream_iter
,
623 bt_message
**message
, uint64_t timestamp
)
625 enum lttng_live_iterator_status ret
= LTTNG_LIVE_ITERATOR_STATUS_OK
;
626 bt_logging_level log_level
= lttng_live_msg_iter
->log_level
;
627 bt_self_component
*self_comp
= lttng_live_msg_iter
->self_comp
;
628 bt_message
*msg
= NULL
;
630 BT_ASSERT(stream_iter
->trace
->clock_class
);
632 msg
= bt_message_message_iterator_inactivity_create(
633 lttng_live_msg_iter
->self_msg_iter
,
634 stream_iter
->trace
->clock_class
, timestamp
);
636 BT_COMP_LOGE_APPEND_CAUSE(self_comp
,
637 "Error emitting message iterator inactivity message");
646 ret
= LTTNG_LIVE_ITERATOR_STATUS_ERROR
;
647 bt_message_put_ref(msg
);
652 enum lttng_live_iterator_status
lttng_live_iterator_next_handle_one_quiescent_stream(
653 struct lttng_live_msg_iter
*lttng_live_msg_iter
,
654 struct lttng_live_stream_iterator
*lttng_live_stream
,
655 bt_message
**message
)
657 enum lttng_live_iterator_status ret
= LTTNG_LIVE_ITERATOR_STATUS_OK
;
659 if (lttng_live_stream
->state
!= LTTNG_LIVE_STREAM_QUIESCENT
) {
660 return LTTNG_LIVE_ITERATOR_STATUS_OK
;
663 if (lttng_live_stream
->current_inactivity_ts
==
664 lttng_live_stream
->last_inactivity_ts
) {
665 lttng_live_stream
->state
= LTTNG_LIVE_STREAM_QUIESCENT_NO_DATA
;
666 ret
= LTTNG_LIVE_ITERATOR_STATUS_CONTINUE
;
670 ret
= emit_inactivity_message(lttng_live_msg_iter
, lttng_live_stream
,
671 message
, lttng_live_stream
->current_inactivity_ts
);
673 lttng_live_stream
->last_inactivity_ts
=
674 lttng_live_stream
->current_inactivity_ts
;
680 int live_get_msg_ts_ns(struct lttng_live_stream_iterator
*stream_iter
,
681 struct lttng_live_msg_iter
*lttng_live_msg_iter
,
682 const bt_message
*msg
, int64_t last_msg_ts_ns
,
685 const bt_clock_class
*clock_class
= NULL
;
686 const bt_clock_snapshot
*clock_snapshot
= NULL
;
688 bt_logging_level log_level
= lttng_live_msg_iter
->log_level
;
689 bt_self_component
*self_comp
= lttng_live_msg_iter
->self_comp
;
692 BT_ASSERT_DBG(ts_ns
);
694 BT_COMP_LOGD("Getting message's timestamp: iter-data-addr=%p, msg-addr=%p, "
695 "last-msg-ts=%" PRId64
, lttng_live_msg_iter
, msg
,
698 switch (bt_message_get_type(msg
)) {
699 case BT_MESSAGE_TYPE_EVENT
:
700 clock_class
= bt_message_event_borrow_stream_class_default_clock_class_const(
702 BT_ASSERT_DBG(clock_class
);
704 clock_snapshot
= bt_message_event_borrow_default_clock_snapshot_const(
707 case BT_MESSAGE_TYPE_PACKET_BEGINNING
:
708 clock_class
= bt_message_packet_beginning_borrow_stream_class_default_clock_class_const(
710 BT_ASSERT(clock_class
);
712 clock_snapshot
= bt_message_packet_beginning_borrow_default_clock_snapshot_const(
715 case BT_MESSAGE_TYPE_PACKET_END
:
716 clock_class
= bt_message_packet_end_borrow_stream_class_default_clock_class_const(
718 BT_ASSERT(clock_class
);
720 clock_snapshot
= bt_message_packet_end_borrow_default_clock_snapshot_const(
723 case BT_MESSAGE_TYPE_DISCARDED_EVENTS
:
724 clock_class
= bt_message_discarded_events_borrow_stream_class_default_clock_class_const(
726 BT_ASSERT(clock_class
);
728 clock_snapshot
= bt_message_discarded_events_borrow_beginning_default_clock_snapshot_const(
731 case BT_MESSAGE_TYPE_DISCARDED_PACKETS
:
732 clock_class
= bt_message_discarded_packets_borrow_stream_class_default_clock_class_const(
734 BT_ASSERT(clock_class
);
736 clock_snapshot
= bt_message_discarded_packets_borrow_beginning_default_clock_snapshot_const(
739 case BT_MESSAGE_TYPE_MESSAGE_ITERATOR_INACTIVITY
:
740 clock_snapshot
= bt_message_message_iterator_inactivity_borrow_default_clock_snapshot_const(
744 /* All the other messages have a higher priority */
745 BT_COMP_LOGD_STR("Message has no timestamp: using the last message timestamp.");
746 *ts_ns
= last_msg_ts_ns
;
750 clock_class
= bt_clock_snapshot_borrow_clock_class_const(clock_snapshot
);
751 BT_ASSERT_DBG(clock_class
);
753 ret
= bt_clock_snapshot_get_ns_from_origin(clock_snapshot
, ts_ns
);
755 BT_COMP_LOGE_APPEND_CAUSE(self_comp
,
756 "Cannot get nanoseconds from Epoch of clock snapshot: "
757 "clock-snapshot-addr=%p", clock_snapshot
);
768 BT_COMP_LOGD("Found message's timestamp: "
769 "iter-data-addr=%p, msg-addr=%p, "
770 "last-msg-ts=%" PRId64
", ts=%" PRId64
,
771 lttng_live_msg_iter
, msg
, last_msg_ts_ns
, *ts_ns
);
778 enum lttng_live_iterator_status
lttng_live_iterator_next_handle_one_active_data_stream(
779 struct lttng_live_msg_iter
*lttng_live_msg_iter
,
780 struct lttng_live_stream_iterator
*lttng_live_stream
,
781 bt_message
**message
)
783 enum lttng_live_iterator_status ret
= LTTNG_LIVE_ITERATOR_STATUS_OK
;
784 bt_logging_level log_level
= lttng_live_msg_iter
->log_level
;
785 bt_self_component
*self_comp
= lttng_live_msg_iter
->self_comp
;
786 enum ctf_msg_iter_status status
;
787 uint64_t session_idx
, trace_idx
;
789 for (session_idx
= 0; session_idx
< lttng_live_msg_iter
->sessions
->len
;
791 struct lttng_live_session
*session
=
792 g_ptr_array_index(lttng_live_msg_iter
->sessions
, session_idx
);
794 if (session
->new_streams_needed
) {
795 ret
= LTTNG_LIVE_ITERATOR_STATUS_CONTINUE
;
798 for (trace_idx
= 0; trace_idx
< session
->traces
->len
;
800 struct lttng_live_trace
*trace
=
801 g_ptr_array_index(session
->traces
, trace_idx
);
802 if (trace
->new_metadata_needed
) {
803 ret
= LTTNG_LIVE_ITERATOR_STATUS_CONTINUE
;
809 if (lttng_live_stream
->state
!= LTTNG_LIVE_STREAM_ACTIVE_DATA
) {
810 ret
= LTTNG_LIVE_ITERATOR_STATUS_ERROR
;
814 status
= ctf_msg_iter_get_next_message(
815 lttng_live_stream
->msg_iter
, message
);
817 case CTF_MSG_ITER_STATUS_EOF
:
818 ret
= LTTNG_LIVE_ITERATOR_STATUS_END
;
820 case CTF_MSG_ITER_STATUS_OK
:
821 ret
= LTTNG_LIVE_ITERATOR_STATUS_OK
;
823 case CTF_MSG_ITER_STATUS_AGAIN
:
825 * Continue immediately (end of packet). The next
826 * get_index may return AGAIN to delay the following
829 ret
= LTTNG_LIVE_ITERATOR_STATUS_CONTINUE
;
831 case CTF_MSG_ITER_STATUS_INVAL
:
832 /* No argument provided by the user, so don't return INVAL. */
833 case CTF_MSG_ITER_STATUS_ERROR
:
835 ret
= LTTNG_LIVE_ITERATOR_STATUS_ERROR
;
836 BT_COMP_LOGE_APPEND_CAUSE(self_comp
,
837 "CTF message iterator return an error or failed: "
838 "msg_iter=%p", lttng_live_stream
->msg_iter
);
847 enum lttng_live_iterator_status
lttng_live_iterator_close_stream(
848 struct lttng_live_msg_iter
*lttng_live_msg_iter
,
849 struct lttng_live_stream_iterator
*stream_iter
,
850 bt_message
**curr_msg
)
852 enum lttng_live_iterator_status live_status
=
853 LTTNG_LIVE_ITERATOR_STATUS_OK
;
854 bt_logging_level log_level
= lttng_live_msg_iter
->log_level
;
855 bt_self_component
*self_comp
= lttng_live_msg_iter
->self_comp
;
857 * The viewer has hung up on us so we are closing the stream. The
858 * `ctf_msg_iter` should simply realize that it needs to close the
859 * stream properly by emitting the necessary stream end message.
861 enum ctf_msg_iter_status status
= ctf_msg_iter_get_next_message(
862 stream_iter
->msg_iter
, curr_msg
);
864 if (status
== CTF_MSG_ITER_STATUS_ERROR
) {
865 BT_COMP_LOGE_APPEND_CAUSE(self_comp
,
866 "Error getting the next message from CTF message iterator");
867 live_status
= LTTNG_LIVE_ITERATOR_STATUS_ERROR
;
871 BT_ASSERT(status
== CTF_MSG_ITER_STATUS_OK
);
879 * handle_no_data_streams()
881 * - for each ACTIVE_NO_DATA stream:
882 * - query relayd for stream data, or quiescence info.
883 * - if need metadata, get metadata, goto retry.
884 * - if new stream, get new stream as ACTIVE_NO_DATA, goto retry
885 * - if quiescent, move to QUIESCENT streams
886 * - if fetched data, move to ACTIVE_DATA streams
887 * (at this point each stream either has data, or is quiescent)
891 * handle_new_streams_and_metadata()
892 * - query relayd for known streams, add them as ACTIVE_NO_DATA
893 * - query relayd for metadata
895 * call handle_active_no_data_streams()
897 * handle_quiescent_streams()
898 * - if at least one stream is ACTIVE_DATA:
899 * - peek stream event with lowest timestamp -> next_ts
900 * - for each quiescent stream
901 * - if next_ts >= quiescent end
902 * - set state to ACTIVE_NO_DATA
904 * - for each quiescent stream
905 * - set state to ACTIVE_NO_DATA
907 * call handle_active_no_data_streams()
909 * handle_active_data_streams()
910 * - if at least one stream is ACTIVE_DATA:
911 * - get stream event with lowest timestamp from heap
912 * - make that stream event the current message.
913 * - move this stream heap position to its next event
914 * - if we need to fetch data from relayd, move
915 * stream to ACTIVE_NO_DATA.
919 * end criterion: ctrl-c on client. If relayd exits or the session
920 * closes on the relay daemon side, we keep on waiting for streams.
921 * Eventually handle --end timestamp (also an end criterion).
923 * When disconnected from relayd: try to re-connect endlessly.
926 enum lttng_live_iterator_status
lttng_live_iterator_next_msg_on_stream(
927 struct lttng_live_msg_iter
*lttng_live_msg_iter
,
928 struct lttng_live_stream_iterator
*stream_iter
,
929 bt_message
**curr_msg
)
931 bt_logging_level log_level
= lttng_live_msg_iter
->log_level
;
932 bt_self_component
*self_comp
= lttng_live_msg_iter
->self_comp
;
933 enum lttng_live_iterator_status live_status
;
935 if (stream_iter
->has_stream_hung_up
) {
937 * The stream has hung up and the stream was properly closed
938 * during the last call to the current function. Return _END
939 * status now so that this stream iterator is removed for the
940 * stream iterator list.
942 live_status
= LTTNG_LIVE_ITERATOR_STATUS_END
;
947 print_stream_state(stream_iter
);
948 live_status
= lttng_live_iterator_handle_new_streams_and_metadata(
949 lttng_live_msg_iter
);
950 if (live_status
!= LTTNG_LIVE_ITERATOR_STATUS_OK
) {
953 live_status
= lttng_live_iterator_next_handle_one_no_data_stream(
954 lttng_live_msg_iter
, stream_iter
);
956 if (live_status
!= LTTNG_LIVE_ITERATOR_STATUS_OK
) {
957 if (live_status
== LTTNG_LIVE_ITERATOR_STATUS_END
) {
959 * We overwrite `live_status` since `curr_msg` is
960 * likely set to a valid message in this function.
962 live_status
= lttng_live_iterator_close_stream(
963 lttng_live_msg_iter
, stream_iter
, curr_msg
);
967 live_status
= lttng_live_iterator_next_handle_one_quiescent_stream(
968 lttng_live_msg_iter
, stream_iter
, curr_msg
);
969 if (live_status
!= LTTNG_LIVE_ITERATOR_STATUS_OK
) {
970 BT_ASSERT(!*curr_msg
);
976 live_status
= lttng_live_iterator_next_handle_one_active_data_stream(
977 lttng_live_msg_iter
, stream_iter
, curr_msg
);
978 if (live_status
!= LTTNG_LIVE_ITERATOR_STATUS_OK
) {
979 BT_ASSERT(!*curr_msg
);
983 if (live_status
== LTTNG_LIVE_ITERATOR_STATUS_CONTINUE
) {
991 enum lttng_live_iterator_status
next_stream_iterator_for_trace(
992 struct lttng_live_msg_iter
*lttng_live_msg_iter
,
993 struct lttng_live_trace
*live_trace
,
994 struct lttng_live_stream_iterator
**youngest_trace_stream_iter
)
996 struct lttng_live_stream_iterator
*youngest_candidate_stream_iter
= NULL
;
997 bt_logging_level log_level
= lttng_live_msg_iter
->log_level
;
998 bt_self_component
*self_comp
= lttng_live_msg_iter
->self_comp
;
999 enum lttng_live_iterator_status stream_iter_status
;;
1000 int64_t youngest_candidate_msg_ts
= INT64_MAX
;
1001 uint64_t stream_iter_idx
;
1003 BT_ASSERT_DBG(live_trace
);
1004 BT_ASSERT_DBG(live_trace
->stream_iterators
);
1006 * Update the current message of every stream iterators of this trace.
1007 * The current msg of every stream must have a timestamp equal or
1008 * larger than the last message returned by this iterator. We must
1009 * ensure monotonicity.
1011 stream_iter_idx
= 0;
1012 while (stream_iter_idx
< live_trace
->stream_iterators
->len
) {
1013 bool stream_iter_is_ended
= false;
1014 struct lttng_live_stream_iterator
*stream_iter
=
1015 g_ptr_array_index(live_trace
->stream_iterators
,
1019 * Find if there is are now current message for this stream
1022 while (!stream_iter
->current_msg
) {
1023 bt_message
*msg
= NULL
;
1024 int64_t curr_msg_ts_ns
= INT64_MAX
;
1025 stream_iter_status
= lttng_live_iterator_next_msg_on_stream(
1026 lttng_live_msg_iter
, stream_iter
, &msg
);
1028 BT_COMP_LOGD("live stream iterator returned status :%s",
1029 print_live_iterator_status(stream_iter_status
));
1030 if (stream_iter_status
== LTTNG_LIVE_ITERATOR_STATUS_END
) {
1031 stream_iter_is_ended
= true;
1035 if (stream_iter_status
!= LTTNG_LIVE_ITERATOR_STATUS_OK
) {
1042 * Get the timestamp in nanoseconds from origin of this
1045 live_get_msg_ts_ns(stream_iter
, lttng_live_msg_iter
,
1046 msg
, lttng_live_msg_iter
->last_msg_ts_ns
,
1050 * Check if the message of the current live stream
1051 * iterator occured at the exact same time or after the
1052 * last message returned by this component's message
1053 * iterator. If not, we return an error.
1055 if (curr_msg_ts_ns
>= lttng_live_msg_iter
->last_msg_ts_ns
) {
1056 stream_iter
->current_msg
= msg
;
1057 stream_iter
->current_msg_ts_ns
= curr_msg_ts_ns
;
1060 * We received a message in the past. To ensure
1061 * monotonicity, we can't send it forward.
1063 BT_COMP_LOGE_APPEND_CAUSE(self_comp
,
1064 "Message's timestamp is less than "
1065 "lttng-live's message iterator's last "
1066 "returned timestamp: "
1067 "lttng-live-msg-iter-addr=%p, ts=%" PRId64
", "
1068 "last-msg-ts=%" PRId64
,
1069 lttng_live_msg_iter
, curr_msg_ts_ns
,
1070 lttng_live_msg_iter
->last_msg_ts_ns
);
1071 stream_iter_status
= LTTNG_LIVE_ITERATOR_STATUS_ERROR
;
1076 BT_ASSERT_DBG(stream_iter
!= youngest_candidate_stream_iter
);
1078 if (!stream_iter_is_ended
) {
1079 if (G_UNLIKELY(youngest_candidate_stream_iter
== NULL
) ||
1080 stream_iter
->current_msg_ts_ns
< youngest_candidate_msg_ts
) {
1082 * Update the current best candidate message
1083 * for the stream iterator of this live trace
1084 * to be forwarded downstream.
1086 youngest_candidate_msg_ts
= stream_iter
->current_msg_ts_ns
;
1087 youngest_candidate_stream_iter
= stream_iter
;
1088 } else if (stream_iter
->current_msg_ts_ns
== youngest_candidate_msg_ts
) {
1090 * Order the messages in an arbitrary but
1091 * deterministic way.
1093 BT_ASSERT_DBG(stream_iter
!= youngest_candidate_stream_iter
);
1094 int ret
= common_muxing_compare_messages(
1095 stream_iter
->current_msg
,
1096 youngest_candidate_stream_iter
->current_msg
);
1099 * The `youngest_candidate_stream_iter->current_msg`
1100 * should go first. Update the next
1101 * iterator and the current timestamp.
1103 youngest_candidate_msg_ts
= stream_iter
->current_msg_ts_ns
;
1104 youngest_candidate_stream_iter
= stream_iter
;
1105 } else if (ret
== 0) {
1107 * Unable to pick which one should go
1110 BT_COMP_LOGW("Cannot deterministically pick next live stream message iterator because they have identical next messages: "
1111 "stream-iter-addr=%p"
1112 "stream-iter-addr=%p",
1114 youngest_candidate_stream_iter
);
1121 * The live stream iterator has ended. That
1122 * iterator is removed from the array, but
1123 * there is no need to increment
1124 * stream_iter_idx as
1125 * g_ptr_array_remove_index_fast replaces the
1126 * removed element with the array's last
1129 g_ptr_array_remove_index_fast(
1130 live_trace
->stream_iterators
,
1135 if (youngest_candidate_stream_iter
) {
1136 *youngest_trace_stream_iter
= youngest_candidate_stream_iter
;
1137 stream_iter_status
= LTTNG_LIVE_ITERATOR_STATUS_OK
;
1140 * The only case where we don't have a candidate for this trace
1141 * is if we reached the end of all the iterators.
1143 BT_ASSERT(live_trace
->stream_iterators
->len
== 0);
1144 stream_iter_status
= LTTNG_LIVE_ITERATOR_STATUS_END
;
1148 return stream_iter_status
;
1152 enum lttng_live_iterator_status
next_stream_iterator_for_session(
1153 struct lttng_live_msg_iter
*lttng_live_msg_iter
,
1154 struct lttng_live_session
*session
,
1155 struct lttng_live_stream_iterator
**youngest_session_stream_iter
)
1157 bt_self_component
*self_comp
= lttng_live_msg_iter
->self_comp
;
1158 bt_logging_level log_level
= lttng_live_msg_iter
->log_level
;
1159 enum lttng_live_iterator_status stream_iter_status
;
1160 uint64_t trace_idx
= 0;
1161 int64_t youngest_candidate_msg_ts
= INT64_MAX
;
1162 struct lttng_live_stream_iterator
*youngest_candidate_stream_iter
= NULL
;
1165 * Make sure we are attached to the session and look for new streams
1168 stream_iter_status
= lttng_live_get_session(lttng_live_msg_iter
, session
);
1169 if (stream_iter_status
!= LTTNG_LIVE_ITERATOR_STATUS_OK
&&
1170 stream_iter_status
!= LTTNG_LIVE_ITERATOR_STATUS_CONTINUE
&&
1171 stream_iter_status
!= LTTNG_LIVE_ITERATOR_STATUS_END
) {
1175 BT_ASSERT_DBG(session
->traces
);
1177 while (trace_idx
< session
->traces
->len
) {
1178 bool trace_is_ended
= false;
1179 struct lttng_live_stream_iterator
*stream_iter
;
1180 struct lttng_live_trace
*trace
=
1181 g_ptr_array_index(session
->traces
, trace_idx
);
1183 stream_iter_status
= next_stream_iterator_for_trace(
1184 lttng_live_msg_iter
, trace
, &stream_iter
);
1185 if (stream_iter_status
== LTTNG_LIVE_ITERATOR_STATUS_END
) {
1187 * All the live stream iterators for this trace are
1188 * ENDed. Remove the trace from this session.
1190 trace_is_ended
= true;
1191 } else if (stream_iter_status
!= LTTNG_LIVE_ITERATOR_STATUS_OK
) {
1195 if (!trace_is_ended
) {
1196 BT_ASSERT_DBG(stream_iter
);
1198 if (G_UNLIKELY(youngest_candidate_stream_iter
== NULL
) ||
1199 stream_iter
->current_msg_ts_ns
< youngest_candidate_msg_ts
) {
1200 youngest_candidate_msg_ts
= stream_iter
->current_msg_ts_ns
;
1201 youngest_candidate_stream_iter
= stream_iter
;
1202 } else if (stream_iter
->current_msg_ts_ns
== youngest_candidate_msg_ts
) {
1204 * Order the messages in an arbitrary but
1205 * deterministic way.
1207 int ret
= common_muxing_compare_messages(
1208 stream_iter
->current_msg
,
1209 youngest_candidate_stream_iter
->current_msg
);
1212 * The `youngest_candidate_stream_iter->current_msg`
1213 * should go first. Update the next iterator
1214 * and the current timestamp.
1216 youngest_candidate_msg_ts
= stream_iter
->current_msg_ts_ns
;
1217 youngest_candidate_stream_iter
= stream_iter
;
1218 } else if (ret
== 0) {
1219 /* Unable to pick which one should go first. */
1220 BT_COMP_LOGW("Cannot deterministically pick next live stream message iterator because they have identical next messages: "
1221 "stream-iter-addr=%p" "stream-iter-addr=%p",
1222 stream_iter
, youngest_candidate_stream_iter
);
1228 * trace_idx is not incremented since
1229 * g_ptr_array_remove_index_fast replaces the
1230 * element at trace_idx with the array's last element.
1232 g_ptr_array_remove_index_fast(session
->traces
,
1236 if (youngest_candidate_stream_iter
) {
1237 *youngest_session_stream_iter
= youngest_candidate_stream_iter
;
1238 stream_iter_status
= LTTNG_LIVE_ITERATOR_STATUS_OK
;
1241 * The only cases where we don't have a candidate for this
1243 * 1. if we reached the end of all the iterators of all the
1244 * traces of this session,
1245 * 2. if we never had live stream iterator in the first place.
1247 * In either cases, we return END.
1249 BT_ASSERT(session
->traces
->len
== 0);
1250 stream_iter_status
= LTTNG_LIVE_ITERATOR_STATUS_END
;
1253 return stream_iter_status
;
1257 void put_messages(bt_message_array_const msgs
, uint64_t count
)
1261 for (i
= 0; i
< count
; i
++) {
1262 BT_MESSAGE_PUT_REF_AND_RESET(msgs
[i
]);
1267 bt_component_class_message_iterator_next_method_status
lttng_live_msg_iter_next(
1268 bt_self_message_iterator
*self_msg_it
,
1269 bt_message_array_const msgs
, uint64_t capacity
,
1272 bt_component_class_message_iterator_next_method_status status
;
1273 enum lttng_live_viewer_status viewer_status
;
1274 struct lttng_live_msg_iter
*lttng_live_msg_iter
=
1275 bt_self_message_iterator_get_data(self_msg_it
);
1276 struct lttng_live_component
*lttng_live
=
1277 lttng_live_msg_iter
->lttng_live_comp
;
1278 bt_self_component
*self_comp
= lttng_live_msg_iter
->self_comp
;
1279 bt_logging_level log_level
= lttng_live_msg_iter
->log_level
;
1280 enum lttng_live_iterator_status stream_iter_status
;
1281 uint64_t session_idx
;
1285 BT_ASSERT_DBG(lttng_live_msg_iter
);
1287 if (G_UNLIKELY(lttng_live_msg_iter
->was_interrupted
)) {
1289 * The iterator was interrupted in a previous call to the
1290 * `_next()` method. We currently do not support generating
1291 * messages after such event. The babeltrace2 CLI should never
1292 * be running the graph after being interrupted. So this check
1293 * is to prevent other graph users from using this live
1294 * iterator in an messed up internal state.
1296 status
= BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_ERROR
;
1297 BT_COMP_LOGE_APPEND_CAUSE(self_comp
,
1298 "Message iterator was interrupted during a previous call to the `next()` and currently does not support continuing after such event.");
1303 * Clear all the invalid message reference that might be left over in
1306 memset(msgs
, 0, capacity
* sizeof(*msgs
));
1309 * If no session are exposed on the relay found at the url provided by
1310 * the user, session count will be 0. In this case, we return status
1311 * end to return gracefully.
1313 if (lttng_live_msg_iter
->sessions
->len
== 0) {
1314 if (lttng_live
->params
.sess_not_found_act
!=
1315 SESSION_NOT_FOUND_ACTION_CONTINUE
) {
1316 status
= BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_END
;
1320 * The are no more active session for this session
1321 * name. Retry to create a viewer session for the
1322 * requested session name.
1324 viewer_status
= lttng_live_create_viewer_session(lttng_live_msg_iter
);
1325 if (viewer_status
!= LTTNG_LIVE_VIEWER_STATUS_OK
) {
1326 if (viewer_status
== LTTNG_LIVE_VIEWER_STATUS_ERROR
) {
1327 status
= BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_ERROR
;
1328 BT_COMP_LOGE_APPEND_CAUSE(self_comp
,
1329 "Error creating LTTng live viewer session");
1330 } else if (viewer_status
== LTTNG_LIVE_VIEWER_STATUS_INTERRUPTED
) {
1331 status
= BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_AGAIN
;
1340 if (lttng_live_msg_iter
->active_stream_iter
== 0) {
1341 lttng_live_force_new_streams_and_metadata(lttng_live_msg_iter
);
1345 * Here the muxing of message is done.
1347 * We need to iterate over all the streams of all the traces of all the
1348 * viewer sessions in order to get the message with the smallest
1349 * timestamp. In this case, a session is a viewer session and there is
1350 * one viewer session per consumer daemon. (UST 32bit, UST 64bit and/or
1351 * kernel). Each viewer session can have multiple traces, for example,
1352 * 64bit UST viewer sessions could have multiple per-pid traces.
1354 * We iterate over the streams of each traces to update and see what is
1355 * their next message's timestamp. From those timestamps, we select the
1356 * message with the smallest timestamp as the best candidate message
1357 * for that trace and do the same thing across all the sessions.
1359 * We then compare the timestamp of best candidate message of all the
1360 * sessions to pick the message with the smallest timestamp and we
1363 while (*count
< capacity
) {
1364 struct lttng_live_stream_iterator
*youngest_stream_iter
= NULL
,
1365 *candidate_stream_iter
= NULL
;
1366 int64_t youngest_msg_ts_ns
= INT64_MAX
;
1368 BT_ASSERT_DBG(lttng_live_msg_iter
->sessions
);
1370 while (session_idx
< lttng_live_msg_iter
->sessions
->len
) {
1371 struct lttng_live_session
*session
=
1372 g_ptr_array_index(lttng_live_msg_iter
->sessions
,
1375 /* Find the best candidate message to send downstream. */
1376 stream_iter_status
= next_stream_iterator_for_session(
1377 lttng_live_msg_iter
, session
,
1378 &candidate_stream_iter
);
1380 /* If we receive an END status, it means that either:
1381 * - Those traces never had active streams (UST with no
1382 * data produced yet),
1383 * - All live stream iterators have ENDed.*/
1384 if (stream_iter_status
== LTTNG_LIVE_ITERATOR_STATUS_END
) {
1385 if (session
->closed
&& session
->traces
->len
== 0) {
1387 * Remove the session from the list.
1388 * session_idx is not modified since
1389 * g_ptr_array_remove_index_fast
1390 * replaces the the removed element with
1391 * the array's last element.
1393 g_ptr_array_remove_index_fast(
1394 lttng_live_msg_iter
->sessions
,
1402 if (stream_iter_status
!= LTTNG_LIVE_ITERATOR_STATUS_OK
) {
1406 if (G_UNLIKELY(youngest_stream_iter
== NULL
) ||
1407 candidate_stream_iter
->current_msg_ts_ns
< youngest_msg_ts_ns
) {
1408 youngest_msg_ts_ns
= candidate_stream_iter
->current_msg_ts_ns
;
1409 youngest_stream_iter
= candidate_stream_iter
;
1410 } else if (candidate_stream_iter
->current_msg_ts_ns
== youngest_msg_ts_ns
) {
1412 * The currently selected message to be sent
1413 * downstream next has the exact same timestamp
1414 * that of the current candidate message. We
1415 * must break the tie in a predictable manner.
1417 BT_COMP_LOGD_STR("Two of the next message candidates have the same timestamps, pick one deterministically.");
1419 * Order the messages in an arbitrary but
1420 * deterministic way.
1422 int ret
= common_muxing_compare_messages(
1423 candidate_stream_iter
->current_msg
,
1424 youngest_stream_iter
->current_msg
);
1427 * The `candidate_stream_iter->current_msg`
1428 * should go first. Update the next
1429 * iterator and the current timestamp.
1431 youngest_msg_ts_ns
= candidate_stream_iter
->current_msg_ts_ns
;
1432 youngest_stream_iter
= candidate_stream_iter
;
1433 } else if (ret
== 0) {
1434 /* Unable to pick which one should go first. */
1435 BT_COMP_LOGW("Cannot deterministically pick next live stream message iterator because they have identical next messages: "
1436 "next-stream-iter-addr=%p" "candidate-stream-iter-addr=%p",
1437 youngest_stream_iter
, candidate_stream_iter
);
1444 if (!youngest_stream_iter
) {
1445 stream_iter_status
= LTTNG_LIVE_ITERATOR_STATUS_AGAIN
;
1449 BT_ASSERT_DBG(youngest_stream_iter
->current_msg
);
1450 /* Ensure monotonicity. */
1451 BT_ASSERT_DBG(lttng_live_msg_iter
->last_msg_ts_ns
<=
1452 youngest_stream_iter
->current_msg_ts_ns
);
1455 * Insert the next message to the message batch. This will set
1456 * stream iterator current messsage to NULL so that next time
1457 * we fetch the next message of that stream iterator
1459 BT_MESSAGE_MOVE_REF(msgs
[*count
], youngest_stream_iter
->current_msg
);
1462 /* Update the last timestamp in nanoseconds sent downstream. */
1463 lttng_live_msg_iter
->last_msg_ts_ns
= youngest_msg_ts_ns
;
1464 youngest_stream_iter
->current_msg_ts_ns
= INT64_MAX
;
1466 stream_iter_status
= LTTNG_LIVE_ITERATOR_STATUS_OK
;
1470 switch (stream_iter_status
) {
1471 case LTTNG_LIVE_ITERATOR_STATUS_OK
:
1472 case LTTNG_LIVE_ITERATOR_STATUS_AGAIN
:
1474 * If we gathered messages, return _OK even if the graph was
1475 * interrupted. This allows for the components downstream to at
1476 * least get the thoses messages. If the graph was indeed
1477 * interrupted there should not be another _next() call as the
1478 * application will tear down the graph. This component class
1479 * doesn't support restarting after an interruption.
1482 status
= BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_OK
;
1484 status
= BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_AGAIN
;
1487 case LTTNG_LIVE_ITERATOR_STATUS_END
:
1488 status
= BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_END
;
1490 case LTTNG_LIVE_ITERATOR_STATUS_NOMEM
:
1491 status
= BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_MEMORY_ERROR
;
1493 case LTTNG_LIVE_ITERATOR_STATUS_ERROR
:
1494 case LTTNG_LIVE_ITERATOR_STATUS_INVAL
:
1495 case LTTNG_LIVE_ITERATOR_STATUS_UNSUPPORTED
:
1496 status
= BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_ERROR
;
1497 /* Put all existing messages on error. */
1498 put_messages(msgs
, *count
);
1509 struct lttng_live_msg_iter
*lttng_live_msg_iter_create(
1510 struct lttng_live_component
*lttng_live_comp
,
1511 bt_self_message_iterator
*self_msg_it
)
1513 bt_self_component
*self_comp
= lttng_live_comp
->self_comp
;
1514 bt_logging_level log_level
= lttng_live_comp
->log_level
;
1516 struct lttng_live_msg_iter
*lttng_live_msg_iter
=
1517 g_new0(struct lttng_live_msg_iter
, 1);
1518 if (!lttng_live_msg_iter
) {
1519 BT_COMP_LOGE_APPEND_CAUSE(self_comp
,
1520 "Failed to allocate lttng_live_msg_iter");
1524 lttng_live_msg_iter
->log_level
= lttng_live_comp
->log_level
;
1525 lttng_live_msg_iter
->self_comp
= lttng_live_comp
->self_comp
;
1526 lttng_live_msg_iter
->lttng_live_comp
= lttng_live_comp
;
1527 lttng_live_msg_iter
->self_msg_iter
= self_msg_it
;
1529 lttng_live_msg_iter
->active_stream_iter
= 0;
1530 lttng_live_msg_iter
->last_msg_ts_ns
= INT64_MIN
;
1531 lttng_live_msg_iter
->was_interrupted
= false;
1533 lttng_live_msg_iter
->sessions
= g_ptr_array_new_with_free_func(
1534 (GDestroyNotify
) lttng_live_destroy_session
);
1535 BT_ASSERT(lttng_live_msg_iter
->sessions
);
1538 return lttng_live_msg_iter
;
1543 bt_component_class_message_iterator_initialize_method_status
lttng_live_msg_iter_init(
1544 bt_self_message_iterator
*self_msg_it
,
1545 bt_self_message_iterator_configuration
*config
,
1546 bt_self_component_source
*self_comp_src
,
1547 bt_self_component_port_output
*self_port
)
1549 bt_component_class_message_iterator_initialize_method_status status
;
1550 bt_self_component
*self_comp
=
1551 bt_self_component_source_as_self_component(self_comp_src
);
1552 struct lttng_live_component
*lttng_live
;
1553 struct lttng_live_msg_iter
*lttng_live_msg_iter
;
1554 enum lttng_live_viewer_status viewer_status
;
1555 bt_logging_level log_level
;
1557 BT_ASSERT(self_msg_it
);
1559 lttng_live
= bt_self_component_get_data(self_comp
);
1560 log_level
= lttng_live
->log_level
;
1561 self_comp
= lttng_live
->self_comp
;
1564 /* There can be only one downstream iterator at the same time. */
1565 BT_ASSERT(!lttng_live
->has_msg_iter
);
1566 lttng_live
->has_msg_iter
= true;
1568 lttng_live_msg_iter
= lttng_live_msg_iter_create(lttng_live
,
1570 if (!lttng_live_msg_iter
) {
1571 status
= BT_COMPONENT_CLASS_MESSAGE_ITERATOR_INITIALIZE_METHOD_STATUS_MEMORY_ERROR
;
1572 BT_COMP_LOGE_APPEND_CAUSE(self_comp
,
1573 "Failed to create lttng_live_msg_iter");
1577 viewer_status
= live_viewer_connection_create(self_comp
, NULL
,
1578 log_level
, lttng_live
->params
.url
->str
, false,
1579 lttng_live_msg_iter
, <tng_live_msg_iter
->viewer_connection
);
1580 if (viewer_status
!= LTTNG_LIVE_VIEWER_STATUS_OK
) {
1581 if (viewer_status
== LTTNG_LIVE_VIEWER_STATUS_ERROR
) {
1582 BT_COMP_LOGE_APPEND_CAUSE(self_comp
,
1583 "Failed to create viewer connection");
1584 } else if (viewer_status
== LTTNG_LIVE_VIEWER_STATUS_INTERRUPTED
) {
1586 * Interruption in the _iter_init() method is not
1587 * supported. Return an error.
1589 BT_COMP_LOGE_APPEND_CAUSE(self_comp
,
1590 "Interrupted while creating viewer connection");
1595 viewer_status
= lttng_live_create_viewer_session(lttng_live_msg_iter
);
1596 if (viewer_status
!= LTTNG_LIVE_VIEWER_STATUS_OK
) {
1597 if (viewer_status
== LTTNG_LIVE_VIEWER_STATUS_ERROR
) {
1598 BT_COMP_LOGE_APPEND_CAUSE(self_comp
,
1599 "Failed to create viewer session");
1600 } else if (viewer_status
== LTTNG_LIVE_VIEWER_STATUS_INTERRUPTED
) {
1602 * Interruption in the _iter_init() method is not
1603 * supported. Return an error.
1605 BT_COMP_LOGE_APPEND_CAUSE(self_comp
,
1606 "Interrupted when creating viewer session");
1611 if (lttng_live_msg_iter
->sessions
->len
== 0) {
1612 switch (lttng_live
->params
.sess_not_found_act
) {
1613 case SESSION_NOT_FOUND_ACTION_CONTINUE
:
1614 BT_COMP_LOGI("Unable to connect to the requested live viewer session. Keep trying to connect because of "
1615 "%s=\"%s\" component parameter: url=\"%s\"",
1616 SESS_NOT_FOUND_ACTION_PARAM
,
1617 SESS_NOT_FOUND_ACTION_CONTINUE_STR
,
1618 lttng_live
->params
.url
->str
);
1620 case SESSION_NOT_FOUND_ACTION_FAIL
:
1621 BT_COMP_LOGE_APPEND_CAUSE(self_comp
,
1622 "Unable to connect to the requested live viewer session. Fail the message iterator initialization because of %s=\"%s\" "
1623 "component parameter: url =\"%s\"",
1624 SESS_NOT_FOUND_ACTION_PARAM
,
1625 SESS_NOT_FOUND_ACTION_FAIL_STR
,
1626 lttng_live
->params
.url
->str
);
1628 case SESSION_NOT_FOUND_ACTION_END
:
1629 BT_COMP_LOGI("Unable to connect to the requested live viewer session. End gracefully at the first _next() "
1630 "call because of %s=\"%s\" component parameter: "
1631 "url=\"%s\"", SESS_NOT_FOUND_ACTION_PARAM
,
1632 SESS_NOT_FOUND_ACTION_END_STR
,
1633 lttng_live
->params
.url
->str
);
1640 bt_self_message_iterator_set_data(self_msg_it
, lttng_live_msg_iter
);
1641 status
= BT_COMPONENT_CLASS_MESSAGE_ITERATOR_INITIALIZE_METHOD_STATUS_OK
;
1645 status
= BT_COMPONENT_CLASS_MESSAGE_ITERATOR_INITIALIZE_METHOD_STATUS_ERROR
;
1646 lttng_live_msg_iter_destroy(lttng_live_msg_iter
);
1651 static struct bt_param_validation_map_value_entry_descr list_sessions_params
[] = {
1652 { URL_PARAM
, BT_PARAM_VALIDATION_MAP_VALUE_ENTRY_MANDATORY
, { .type
= BT_VALUE_TYPE_STRING
} },
1653 BT_PARAM_VALIDATION_MAP_VALUE_ENTRY_END
1657 bt_component_class_query_method_status
lttng_live_query_list_sessions(
1658 const bt_value
*params
, const bt_value
**result
,
1659 bt_self_component_class
*self_comp_class
,
1660 bt_logging_level log_level
)
1662 bt_component_class_query_method_status status
;
1663 const bt_value
*url_value
= NULL
;
1665 struct live_viewer_connection
*viewer_connection
= NULL
;
1666 enum lttng_live_viewer_status viewer_status
;
1667 enum bt_param_validation_status validation_status
;
1668 gchar
*validate_error
= NULL
;
1670 validation_status
= bt_param_validation_validate(params
,
1671 list_sessions_params
, &validate_error
);
1672 if (validation_status
== BT_PARAM_VALIDATION_STATUS_MEMORY_ERROR
) {
1673 status
= BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_MEMORY_ERROR
;
1675 } else if (validation_status
== BT_PARAM_VALIDATION_STATUS_VALIDATION_ERROR
) {
1676 status
= BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_ERROR
;
1677 BT_COMP_CLASS_LOGE_APPEND_CAUSE(self_comp_class
, "%s",
1682 url_value
= bt_value_map_borrow_entry_value_const(params
, URL_PARAM
);
1683 url
= bt_value_string_get(url_value
);
1685 viewer_status
= live_viewer_connection_create(NULL
, self_comp_class
,
1686 log_level
, url
, true, NULL
, &viewer_connection
);
1687 if (viewer_status
!= LTTNG_LIVE_VIEWER_STATUS_OK
) {
1688 if (viewer_status
== LTTNG_LIVE_VIEWER_STATUS_ERROR
) {
1689 BT_COMP_CLASS_LOGE_APPEND_CAUSE(self_comp_class
,
1690 "Failed to create viewer connection");
1691 status
= BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_ERROR
;
1692 } else if (viewer_status
== LTTNG_LIVE_VIEWER_STATUS_INTERRUPTED
) {
1693 status
= BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_AGAIN
;
1700 status
= live_viewer_connection_list_sessions(viewer_connection
,
1702 if (status
!= BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_OK
) {
1703 BT_COMP_CLASS_LOGE_APPEND_CAUSE(self_comp_class
,
1704 "Failed to list viewer sessions");
1711 BT_VALUE_PUT_REF_AND_RESET(*result
);
1714 status
= BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_ERROR
;
1718 if (viewer_connection
) {
1719 live_viewer_connection_destroy(viewer_connection
);
1722 g_free(validate_error
);
1728 bt_component_class_query_method_status
lttng_live_query_support_info(
1729 const bt_value
*params
, const bt_value
**result
,
1730 bt_self_component_class
*self_comp_class
,
1731 bt_logging_level log_level
)
1733 bt_component_class_query_method_status status
=
1734 BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_OK
;
1735 const bt_value
*input_type_value
;
1736 const bt_value
*input_value
;
1738 struct bt_common_lttng_live_url_parts parts
= { 0 };
1740 /* Used by the logging macros */
1741 __attribute__((unused
)) bt_self_component
*self_comp
= NULL
;
1744 input_type_value
= bt_value_map_borrow_entry_value_const(params
,
1746 if (!input_type_value
) {
1747 BT_COMP_CLASS_LOGE_APPEND_CAUSE(self_comp_class
,
1748 "Missing expected `type` parameter.");
1752 if (!bt_value_is_string(input_type_value
)) {
1753 BT_COMP_CLASS_LOGE_APPEND_CAUSE(self_comp_class
,
1754 "`type` parameter is not a string value.");
1758 if (strcmp(bt_value_string_get(input_type_value
), "string") != 0) {
1759 /* We don't handle file system paths */
1763 input_value
= bt_value_map_borrow_entry_value_const(params
, "input");
1765 BT_COMP_CLASS_LOGE_APPEND_CAUSE(self_comp_class
,
1766 "Missing expected `input` parameter.");
1770 if (!bt_value_is_string(input_value
)) {
1771 BT_COMP_CLASS_LOGE_APPEND_CAUSE(self_comp_class
,
1772 "`input` parameter is not a string value.");
1776 parts
= bt_common_parse_lttng_live_url(bt_value_string_get(input_value
),
1778 if (parts
.session_name
) {
1780 * Looks pretty much like an LTTng live URL: we got the
1781 * session name part, which forms a complete URL.
1787 *result
= bt_value_real_create_init(weight
);
1789 status
= BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_MEMORY_ERROR
;
1797 status
= BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_ERROR
;
1800 BT_ASSERT(!*result
);
1803 bt_common_destroy_lttng_live_url_parts(&parts
);
1808 bt_component_class_query_method_status
lttng_live_query(
1809 bt_self_component_class_source
*comp_class
,
1810 bt_private_query_executor
*priv_query_exec
,
1811 const char *object
, const bt_value
*params
,
1812 __attribute__((unused
)) void *method_data
,
1813 const bt_value
**result
)
1815 bt_component_class_query_method_status status
=
1816 BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_OK
;
1817 bt_self_component
*self_comp
= NULL
;
1818 bt_self_component_class
*self_comp_class
=
1819 bt_self_component_class_source_as_self_component_class(comp_class
);
1820 bt_logging_level log_level
= bt_query_executor_get_logging_level(
1821 bt_private_query_executor_as_query_executor_const(
1824 if (strcmp(object
, "sessions") == 0) {
1825 status
= lttng_live_query_list_sessions(params
, result
,
1826 self_comp_class
, log_level
);
1827 } else if (strcmp(object
, "babeltrace.support-info") == 0) {
1828 status
= lttng_live_query_support_info(params
, result
,
1829 self_comp_class
, log_level
);
1831 BT_COMP_LOGI("Unknown query object `%s`", object
);
1832 status
= BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_UNKNOWN_OBJECT
;
1841 void lttng_live_component_destroy_data(struct lttng_live_component
*lttng_live
)
1846 if (lttng_live
->params
.url
) {
1847 g_string_free(lttng_live
->params
.url
, TRUE
);
1853 void lttng_live_component_finalize(bt_self_component_source
*component
)
1855 void *data
= bt_self_component_get_data(
1856 bt_self_component_source_as_self_component(component
));
1861 lttng_live_component_destroy_data(data
);
1865 enum session_not_found_action
parse_session_not_found_action_param(
1866 const bt_value
*no_session_param
)
1868 enum session_not_found_action action
;
1869 const char *no_session_act_str
= bt_value_string_get(no_session_param
);
1871 if (strcmp(no_session_act_str
, SESS_NOT_FOUND_ACTION_CONTINUE_STR
) == 0) {
1872 action
= SESSION_NOT_FOUND_ACTION_CONTINUE
;
1873 } else if (strcmp(no_session_act_str
, SESS_NOT_FOUND_ACTION_FAIL_STR
) == 0) {
1874 action
= SESSION_NOT_FOUND_ACTION_FAIL
;
1876 BT_ASSERT(strcmp(no_session_act_str
, SESS_NOT_FOUND_ACTION_END_STR
) == 0);
1877 action
= SESSION_NOT_FOUND_ACTION_END
;
1883 static struct bt_param_validation_value_descr inputs_elem_descr
= {
1884 .type
= BT_VALUE_TYPE_STRING
,
1887 static const char *sess_not_found_action_choices
[] = {
1888 SESS_NOT_FOUND_ACTION_CONTINUE_STR
,
1889 SESS_NOT_FOUND_ACTION_FAIL_STR
,
1890 SESS_NOT_FOUND_ACTION_END_STR
,
1893 static struct bt_param_validation_map_value_entry_descr params_descr
[] = {
1894 { INPUTS_PARAM
, BT_PARAM_VALIDATION_MAP_VALUE_ENTRY_MANDATORY
, { BT_VALUE_TYPE_ARRAY
, .array
= {
1897 .element_type
= &inputs_elem_descr
,
1899 { SESS_NOT_FOUND_ACTION_PARAM
, BT_PARAM_VALIDATION_MAP_VALUE_ENTRY_OPTIONAL
, { BT_VALUE_TYPE_STRING
, .string
= {
1900 .choices
= sess_not_found_action_choices
,
1902 BT_PARAM_VALIDATION_MAP_VALUE_ENTRY_END
1906 bt_component_class_initialize_method_status
lttng_live_component_create(
1907 const bt_value
*params
,
1908 bt_logging_level log_level
,
1909 bt_self_component
*self_comp
,
1910 struct lttng_live_component
**component
)
1912 struct lttng_live_component
*lttng_live
= NULL
;
1913 const bt_value
*inputs_value
;
1914 const bt_value
*url_value
;
1915 const bt_value
*value
;
1917 enum bt_param_validation_status validation_status
;
1918 gchar
*validation_error
= NULL
;
1919 bt_component_class_initialize_method_status status
;
1921 validation_status
= bt_param_validation_validate(params
, params_descr
,
1923 if (validation_status
== BT_PARAM_VALIDATION_STATUS_MEMORY_ERROR
) {
1924 status
= BT_COMPONENT_CLASS_INITIALIZE_METHOD_STATUS_MEMORY_ERROR
;
1926 } else if (validation_status
== BT_PARAM_VALIDATION_STATUS_VALIDATION_ERROR
) {
1927 BT_COMP_LOGE_APPEND_CAUSE(self_comp
, "%s", validation_error
);
1928 status
= BT_COMPONENT_CLASS_INITIALIZE_METHOD_STATUS_ERROR
;
1932 lttng_live
= g_new0(struct lttng_live_component
, 1);
1934 status
= BT_COMPONENT_CLASS_INITIALIZE_METHOD_STATUS_MEMORY_ERROR
;
1937 lttng_live
->log_level
= log_level
;
1938 lttng_live
->self_comp
= self_comp
;
1939 lttng_live
->max_query_size
= MAX_QUERY_SIZE
;
1940 lttng_live
->has_msg_iter
= false;
1943 bt_value_map_borrow_entry_value_const(params
, INPUTS_PARAM
);
1945 bt_value_array_borrow_element_by_index_const(inputs_value
, 0);
1946 url
= bt_value_string_get(url_value
);
1948 lttng_live
->params
.url
= g_string_new(url
);
1949 if (!lttng_live
->params
.url
) {
1950 status
= BT_COMPONENT_CLASS_INITIALIZE_METHOD_STATUS_MEMORY_ERROR
;
1954 value
= bt_value_map_borrow_entry_value_const(params
,
1955 SESS_NOT_FOUND_ACTION_PARAM
);
1957 lttng_live
->params
.sess_not_found_act
=
1958 parse_session_not_found_action_param(value
);
1960 BT_COMP_LOGI("Optional `%s` parameter is missing: "
1961 "defaulting to `%s`.",
1962 SESS_NOT_FOUND_ACTION_PARAM
,
1963 SESS_NOT_FOUND_ACTION_CONTINUE_STR
);
1964 lttng_live
->params
.sess_not_found_act
=
1965 SESSION_NOT_FOUND_ACTION_CONTINUE
;
1968 status
= BT_COMPONENT_CLASS_INITIALIZE_METHOD_STATUS_OK
;
1972 lttng_live_component_destroy_data(lttng_live
);
1975 g_free(validation_error
);
1977 *component
= lttng_live
;
1982 bt_component_class_initialize_method_status
lttng_live_component_init(
1983 bt_self_component_source
*self_comp_src
,
1984 bt_self_component_source_configuration
*config
,
1985 const bt_value
*params
,
1986 __attribute__((unused
)) void *init_method_data
)
1988 struct lttng_live_component
*lttng_live
;
1989 bt_component_class_initialize_method_status ret
;
1990 bt_self_component
*self_comp
=
1991 bt_self_component_source_as_self_component(self_comp_src
);
1992 bt_logging_level log_level
= bt_component_get_logging_level(
1993 bt_self_component_as_component(self_comp
));
1994 bt_self_component_add_port_status add_port_status
;
1996 ret
= lttng_live_component_create(params
, log_level
, self_comp
, <tng_live
);
1997 if (ret
!= BT_COMPONENT_CLASS_INITIALIZE_METHOD_STATUS_OK
) {
2001 add_port_status
= bt_self_component_source_add_output_port(
2002 self_comp_src
, "out", NULL
, NULL
);
2003 if (add_port_status
!= BT_SELF_COMPONENT_ADD_PORT_STATUS_OK
) {
2004 ret
= (int) add_port_status
;
2008 bt_self_component_set_data(self_comp
, lttng_live
);
2012 lttng_live_component_destroy_data(lttng_live
);