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"
41 #include "common/assert.h"
42 #include <babeltrace2/babeltrace.h>
43 #include "compat/compiler.h"
44 #include <babeltrace2/types.h>
46 #include "plugins/common/muxing/muxing.h"
47 #include "plugins/common/param-validation/param-validation.h"
49 #include "data-stream.h"
51 #include "lttng-live.h"
53 #define MAX_QUERY_SIZE (256*1024)
54 #define URL_PARAM "url"
55 #define INPUTS_PARAM "inputs"
56 #define SESS_NOT_FOUND_ACTION_PARAM "session-not-found-action"
57 #define SESS_NOT_FOUND_ACTION_CONTINUE_STR "continue"
58 #define SESS_NOT_FOUND_ACTION_FAIL_STR "fail"
59 #define SESS_NOT_FOUND_ACTION_END_STR "end"
61 #define print_dbg(fmt, ...) BT_COMP_LOGD(fmt, ## __VA_ARGS__)
64 const char *print_live_iterator_status(enum lttng_live_iterator_status status
)
67 case LTTNG_LIVE_ITERATOR_STATUS_CONTINUE
:
68 return "LTTNG_LIVE_ITERATOR_STATUS_CONTINUE";
69 case LTTNG_LIVE_ITERATOR_STATUS_AGAIN
:
70 return "LTTNG_LIVE_ITERATOR_STATUS_AGAIN";
71 case LTTNG_LIVE_ITERATOR_STATUS_END
:
72 return "LTTNG_LIVE_ITERATOR_STATUS_END";
73 case LTTNG_LIVE_ITERATOR_STATUS_OK
:
74 return "LTTNG_LIVE_ITERATOR_STATUS_OK";
75 case LTTNG_LIVE_ITERATOR_STATUS_INVAL
:
76 return "LTTNG_LIVE_ITERATOR_STATUS_INVAL";
77 case LTTNG_LIVE_ITERATOR_STATUS_ERROR
:
78 return "LTTNG_LIVE_ITERATOR_STATUS_ERROR";
79 case LTTNG_LIVE_ITERATOR_STATUS_NOMEM
:
80 return "LTTNG_LIVE_ITERATOR_STATUS_NOMEM";
81 case LTTNG_LIVE_ITERATOR_STATUS_UNSUPPORTED
:
82 return "LTTNG_LIVE_ITERATOR_STATUS_UNSUPPORTED";
89 const char *print_state(struct lttng_live_stream_iterator
*s
)
92 case LTTNG_LIVE_STREAM_ACTIVE_NO_DATA
:
93 return "ACTIVE_NO_DATA";
94 case LTTNG_LIVE_STREAM_QUIESCENT_NO_DATA
:
95 return "QUIESCENT_NO_DATA";
96 case LTTNG_LIVE_STREAM_QUIESCENT
:
98 case LTTNG_LIVE_STREAM_ACTIVE_DATA
:
100 case LTTNG_LIVE_STREAM_EOF
:
107 #define print_stream_state(live_stream_iter) \
109 BT_COMP_LOGD("stream state %s last_inact_ts %" PRId64 \
110 ", curr_inact_ts %" PRId64, \
111 print_state(live_stream_iter), \
112 live_stream_iter->last_inactivity_ts, \
113 live_stream_iter->current_inactivity_ts); \
117 bool lttng_live_graph_is_canceled(struct lttng_live_msg_iter
*msg_iter
)
126 ret
= bt_self_message_iterator_is_interrupted(
127 msg_iter
->self_msg_iter
);
134 struct lttng_live_trace
*lttng_live_find_trace(struct lttng_live_session
*session
,
138 struct lttng_live_trace
*ret_trace
= NULL
;
140 for (trace_idx
= 0; trace_idx
< session
->traces
->len
; trace_idx
++) {
141 struct lttng_live_trace
*trace
=
142 g_ptr_array_index(session
->traces
, trace_idx
);
143 if (trace
->id
== trace_id
) {
154 void lttng_live_destroy_trace(struct lttng_live_trace
*trace
)
156 bt_logging_level log_level
= trace
->log_level
;
157 bt_self_component
*self_comp
= trace
->self_comp
;
159 BT_COMP_LOGD("Destroy lttng_live_trace");
161 BT_ASSERT(trace
->stream_iterators
);
162 g_ptr_array_free(trace
->stream_iterators
, TRUE
);
164 BT_TRACE_PUT_REF_AND_RESET(trace
->trace
);
165 BT_TRACE_CLASS_PUT_REF_AND_RESET(trace
->trace_class
);
167 lttng_live_metadata_fini(trace
);
172 struct lttng_live_trace
*lttng_live_create_trace(struct lttng_live_session
*session
,
175 struct lttng_live_trace
*trace
= NULL
;
176 bt_logging_level log_level
= session
->log_level
;
177 bt_self_component
*self_comp
= session
->self_comp
;
179 trace
= g_new0(struct lttng_live_trace
, 1);
183 trace
->log_level
= session
->log_level
;
184 trace
->self_comp
= session
->self_comp
;
185 trace
->session
= session
;
186 trace
->id
= trace_id
;
187 trace
->trace_class
= NULL
;
189 trace
->stream_iterators
= g_ptr_array_new_with_free_func(
190 (GDestroyNotify
) lttng_live_stream_iterator_destroy
);
191 BT_ASSERT(trace
->stream_iterators
);
192 trace
->new_metadata_needed
= true;
193 g_ptr_array_add(session
->traces
, trace
);
195 BT_COMP_LOGI("Create trace");
205 struct lttng_live_trace
*lttng_live_borrow_trace(
206 struct lttng_live_session
*session
, uint64_t trace_id
)
208 struct lttng_live_trace
*trace
;
210 trace
= lttng_live_find_trace(session
, trace_id
);
215 /* The session is the owner of the newly created trace. */
216 trace
= lttng_live_create_trace(session
, trace_id
);
223 int lttng_live_add_session(struct lttng_live_msg_iter
*lttng_live_msg_iter
,
224 uint64_t session_id
, const char *hostname
,
225 const char *session_name
)
228 struct lttng_live_session
*session
;
229 bt_logging_level log_level
= lttng_live_msg_iter
->log_level
;
230 bt_self_component
*self_comp
= lttng_live_msg_iter
->self_comp
;
232 session
= g_new0(struct lttng_live_session
, 1);
237 session
->log_level
= lttng_live_msg_iter
->log_level
;
238 session
->self_comp
= lttng_live_msg_iter
->self_comp
;
239 session
->id
= session_id
;
240 session
->traces
= g_ptr_array_new_with_free_func(
241 (GDestroyNotify
) lttng_live_destroy_trace
);
242 BT_ASSERT(session
->traces
);
243 session
->lttng_live_msg_iter
= lttng_live_msg_iter
;
244 session
->new_streams_needed
= true;
245 session
->hostname
= g_string_new(hostname
);
246 BT_ASSERT(session
->hostname
);
248 session
->session_name
= g_string_new(session_name
);
249 BT_ASSERT(session
->session_name
);
251 BT_COMP_LOGI("Reading from session: %" PRIu64
" hostname: %s session_name: %s",
252 session
->id
, hostname
, session_name
);
253 g_ptr_array_add(lttng_live_msg_iter
->sessions
, session
);
256 BT_COMP_LOGE("Error adding session");
264 void lttng_live_destroy_session(struct lttng_live_session
*session
)
266 bt_logging_level log_level
;
267 bt_self_component
*self_comp
;
273 log_level
= session
->log_level
;
274 self_comp
= session
->self_comp
;
275 BT_COMP_LOGD("Destroy lttng live session");
276 if (session
->id
!= -1ULL) {
277 if (lttng_live_detach_session(session
)) {
278 if (!lttng_live_graph_is_canceled(
279 session
->lttng_live_msg_iter
)) {
280 /* Old relayd cannot detach sessions. */
281 BT_COMP_LOGD("Unable to detach lttng live session %" PRIu64
,
288 if (session
->traces
) {
289 g_ptr_array_free(session
->traces
, TRUE
);
292 if (session
->hostname
) {
293 g_string_free(session
->hostname
, TRUE
);
295 if (session
->session_name
) {
296 g_string_free(session
->session_name
, TRUE
);
305 void lttng_live_msg_iter_destroy(struct lttng_live_msg_iter
*lttng_live_msg_iter
)
307 if (!lttng_live_msg_iter
) {
311 if (lttng_live_msg_iter
->sessions
) {
312 g_ptr_array_free(lttng_live_msg_iter
->sessions
, TRUE
);
315 BT_OBJECT_PUT_REF_AND_RESET(lttng_live_msg_iter
->viewer_connection
);
316 BT_ASSERT(lttng_live_msg_iter
->lttng_live_comp
);
317 BT_ASSERT(lttng_live_msg_iter
->lttng_live_comp
->has_msg_iter
);
319 /* All stream iterators must be destroyed at this point. */
320 BT_ASSERT(lttng_live_msg_iter
->active_stream_iter
== 0);
321 lttng_live_msg_iter
->lttng_live_comp
->has_msg_iter
= false;
323 g_free(lttng_live_msg_iter
);
330 void lttng_live_msg_iter_finalize(bt_self_message_iterator
*self_msg_iter
)
332 struct lttng_live_msg_iter
*lttng_live_msg_iter
;
334 BT_ASSERT(self_msg_iter
);
336 lttng_live_msg_iter
= bt_self_message_iterator_get_data(self_msg_iter
);
337 BT_ASSERT(lttng_live_msg_iter
);
338 lttng_live_msg_iter_destroy(lttng_live_msg_iter
);
342 enum lttng_live_iterator_status
lttng_live_iterator_next_check_stream_state(
343 struct lttng_live_stream_iterator
*lttng_live_stream
)
345 bt_logging_level log_level
= lttng_live_stream
->log_level
;
346 bt_self_component
*self_comp
= lttng_live_stream
->self_comp
;
348 switch (lttng_live_stream
->state
) {
349 case LTTNG_LIVE_STREAM_QUIESCENT
:
350 case LTTNG_LIVE_STREAM_ACTIVE_DATA
:
352 case LTTNG_LIVE_STREAM_ACTIVE_NO_DATA
:
354 BT_COMP_LOGF("Unexpected stream state \"ACTIVE_NO_DATA\"");
356 case LTTNG_LIVE_STREAM_QUIESCENT_NO_DATA
:
358 BT_COMP_LOGF("Unexpected stream state \"QUIESCENT_NO_DATA\"");
360 case LTTNG_LIVE_STREAM_EOF
:
363 return LTTNG_LIVE_ITERATOR_STATUS_OK
;
367 * For active no data stream, fetch next data. It can be either:
368 * - quiescent: need to put it in the prio heap at quiescent end
370 * - have data: need to wire up first event into the prio heap,
371 * - have no data on this stream at this point: need to retry (AGAIN) or
375 enum lttng_live_iterator_status
lttng_live_iterator_next_handle_one_no_data_stream(
376 struct lttng_live_msg_iter
*lttng_live_msg_iter
,
377 struct lttng_live_stream_iterator
*lttng_live_stream
)
379 bt_logging_level log_level
= lttng_live_msg_iter
->log_level
;
380 bt_self_component
*self_comp
= lttng_live_msg_iter
->self_comp
;
381 enum lttng_live_iterator_status ret
= LTTNG_LIVE_ITERATOR_STATUS_OK
;
382 enum lttng_live_stream_state orig_state
= lttng_live_stream
->state
;
383 struct packet_index index
;
385 if (lttng_live_stream
->trace
->new_metadata_needed
) {
386 ret
= LTTNG_LIVE_ITERATOR_STATUS_CONTINUE
;
389 if (lttng_live_stream
->trace
->session
->new_streams_needed
) {
390 ret
= LTTNG_LIVE_ITERATOR_STATUS_CONTINUE
;
393 if (lttng_live_stream
->state
!= LTTNG_LIVE_STREAM_ACTIVE_NO_DATA
&&
394 lttng_live_stream
->state
!= LTTNG_LIVE_STREAM_QUIESCENT_NO_DATA
) {
397 ret
= lttng_live_get_next_index(lttng_live_msg_iter
, lttng_live_stream
,
399 if (ret
!= LTTNG_LIVE_ITERATOR_STATUS_OK
) {
402 BT_ASSERT_DBG(lttng_live_stream
->state
!= LTTNG_LIVE_STREAM_EOF
);
403 if (lttng_live_stream
->state
== LTTNG_LIVE_STREAM_QUIESCENT
) {
404 uint64_t last_inact_ts
= lttng_live_stream
->last_inactivity_ts
,
405 curr_inact_ts
= lttng_live_stream
->current_inactivity_ts
;
407 if (orig_state
== LTTNG_LIVE_STREAM_QUIESCENT_NO_DATA
&&
408 last_inact_ts
== curr_inact_ts
) {
409 ret
= LTTNG_LIVE_ITERATOR_STATUS_AGAIN
;
410 print_stream_state(lttng_live_stream
);
412 ret
= LTTNG_LIVE_ITERATOR_STATUS_CONTINUE
;
416 lttng_live_stream
->base_offset
= index
.offset
;
417 lttng_live_stream
->offset
= index
.offset
;
418 lttng_live_stream
->len
= index
.packet_size
/ CHAR_BIT
;
420 if (ret
== LTTNG_LIVE_ITERATOR_STATUS_OK
) {
421 ret
= lttng_live_iterator_next_check_stream_state(lttng_live_stream
);
427 * Creation of the message requires the ctf trace class to be created
428 * beforehand, but the live protocol gives us all streams (including metadata)
429 * at once. So we split it in three steps: getting streams, getting metadata
430 * (which creates the ctf trace class), and then creating the per-stream
434 enum lttng_live_iterator_status
lttng_live_get_session(
435 struct lttng_live_msg_iter
*lttng_live_msg_iter
,
436 struct lttng_live_session
*session
)
438 enum lttng_live_iterator_status status
;
441 if (!session
->attached
) {
442 enum lttng_live_attach_session_status attach_status
=
443 lttng_live_attach_session(session
);
444 if (attach_status
!= LTTNG_LIVE_ATTACH_SESSION_STATUS_OK
) {
445 if (lttng_live_graph_is_canceled(lttng_live_msg_iter
)) {
446 status
= LTTNG_LIVE_ITERATOR_STATUS_AGAIN
;
448 status
= LTTNG_LIVE_ITERATOR_STATUS_ERROR
;
454 status
= lttng_live_get_new_streams(session
);
455 if (status
!= LTTNG_LIVE_ITERATOR_STATUS_OK
&&
456 status
!= LTTNG_LIVE_ITERATOR_STATUS_END
) {
460 while (trace_idx
< session
->traces
->len
) {
461 struct lttng_live_trace
*trace
=
462 g_ptr_array_index(session
->traces
, trace_idx
);
464 status
= lttng_live_metadata_update(trace
);
466 case LTTNG_LIVE_ITERATOR_STATUS_OK
:
469 case LTTNG_LIVE_ITERATOR_STATUS_END
:
471 * The trace has ended. Remove it of the array an
472 * continue the iteration.
473 * We can remove the trace safely when using the
474 * g_ptr_array_remove_index_fast because it replaces
475 * the element at trace_idx with the array's last
476 * element. trace_idx is not incremented because of
479 (void) g_ptr_array_remove_index_fast(session
->traces
,
486 status
= lttng_live_lazy_msg_init(session
);
493 void lttng_live_need_new_streams(struct lttng_live_msg_iter
*lttng_live_msg_iter
)
495 uint64_t session_idx
;
497 for (session_idx
= 0; session_idx
< lttng_live_msg_iter
->sessions
->len
;
499 struct lttng_live_session
*session
=
500 g_ptr_array_index(lttng_live_msg_iter
->sessions
, session_idx
);
501 session
->new_streams_needed
= true;
506 void lttng_live_force_new_streams_and_metadata(struct lttng_live_msg_iter
*lttng_live_msg_iter
)
508 uint64_t session_idx
, trace_idx
;
510 for (session_idx
= 0; session_idx
< lttng_live_msg_iter
->sessions
->len
;
512 struct lttng_live_session
*session
=
513 g_ptr_array_index(lttng_live_msg_iter
->sessions
, session_idx
);
514 session
->new_streams_needed
= true;
515 for (trace_idx
= 0; trace_idx
< session
->traces
->len
;
517 struct lttng_live_trace
*trace
=
518 g_ptr_array_index(session
->traces
, trace_idx
);
519 trace
->new_metadata_needed
= true;
525 enum lttng_live_iterator_status
526 lttng_live_iterator_handle_new_streams_and_metadata(
527 struct lttng_live_msg_iter
*lttng_live_msg_iter
)
529 enum lttng_live_iterator_status ret
= LTTNG_LIVE_ITERATOR_STATUS_OK
;
530 uint64_t session_idx
= 0, nr_sessions_opened
= 0;
531 struct lttng_live_session
*session
;
532 enum session_not_found_action sess_not_found_act
=
533 lttng_live_msg_iter
->lttng_live_comp
->params
.sess_not_found_act
;
536 * In a remotely distant future, we could add a "new
537 * session" flag to the protocol, which would tell us that we
538 * need to query for new sessions even though we have sessions
541 if (lttng_live_msg_iter
->sessions
->len
== 0) {
542 if (sess_not_found_act
!= SESSION_NOT_FOUND_ACTION_CONTINUE
) {
543 ret
= LTTNG_LIVE_ITERATOR_STATUS_END
;
547 * Retry to create a viewer session for the requested
550 if (lttng_live_create_viewer_session(lttng_live_msg_iter
)) {
551 ret
= LTTNG_LIVE_ITERATOR_STATUS_ERROR
;
557 for (session_idx
= 0; session_idx
< lttng_live_msg_iter
->sessions
->len
;
559 session
= g_ptr_array_index(lttng_live_msg_iter
->sessions
,
561 ret
= lttng_live_get_session(lttng_live_msg_iter
, session
);
563 case LTTNG_LIVE_ITERATOR_STATUS_OK
:
565 case LTTNG_LIVE_ITERATOR_STATUS_END
:
566 ret
= LTTNG_LIVE_ITERATOR_STATUS_OK
;
571 if (!session
->closed
) {
572 nr_sessions_opened
++;
576 if (ret
== LTTNG_LIVE_ITERATOR_STATUS_OK
&&
577 sess_not_found_act
!= SESSION_NOT_FOUND_ACTION_CONTINUE
&&
578 nr_sessions_opened
== 0) {
579 ret
= LTTNG_LIVE_ITERATOR_STATUS_END
;
585 enum lttng_live_iterator_status
emit_inactivity_message(
586 struct lttng_live_msg_iter
*lttng_live_msg_iter
,
587 struct lttng_live_stream_iterator
*stream_iter
,
588 bt_message
**message
, uint64_t timestamp
)
590 enum lttng_live_iterator_status ret
= LTTNG_LIVE_ITERATOR_STATUS_OK
;
591 bt_message
*msg
= NULL
;
593 BT_ASSERT(stream_iter
->trace
->clock_class
);
595 msg
= bt_message_message_iterator_inactivity_create(
596 lttng_live_msg_iter
->self_msg_iter
,
597 stream_iter
->trace
->clock_class
, timestamp
);
607 ret
= LTTNG_LIVE_ITERATOR_STATUS_ERROR
;
608 bt_message_put_ref(msg
);
613 enum lttng_live_iterator_status
lttng_live_iterator_next_handle_one_quiescent_stream(
614 struct lttng_live_msg_iter
*lttng_live_msg_iter
,
615 struct lttng_live_stream_iterator
*lttng_live_stream
,
616 bt_message
**message
)
618 enum lttng_live_iterator_status ret
= LTTNG_LIVE_ITERATOR_STATUS_OK
;
620 if (lttng_live_stream
->state
!= LTTNG_LIVE_STREAM_QUIESCENT
) {
621 return LTTNG_LIVE_ITERATOR_STATUS_OK
;
624 if (lttng_live_stream
->current_inactivity_ts
==
625 lttng_live_stream
->last_inactivity_ts
) {
626 lttng_live_stream
->state
= LTTNG_LIVE_STREAM_QUIESCENT_NO_DATA
;
627 ret
= LTTNG_LIVE_ITERATOR_STATUS_CONTINUE
;
631 ret
= emit_inactivity_message(lttng_live_msg_iter
, lttng_live_stream
,
632 message
, lttng_live_stream
->current_inactivity_ts
);
634 lttng_live_stream
->last_inactivity_ts
=
635 lttng_live_stream
->current_inactivity_ts
;
641 int live_get_msg_ts_ns(struct lttng_live_stream_iterator
*stream_iter
,
642 struct lttng_live_msg_iter
*lttng_live_msg_iter
,
643 const bt_message
*msg
, int64_t last_msg_ts_ns
,
646 const bt_clock_class
*clock_class
= NULL
;
647 const bt_clock_snapshot
*clock_snapshot
= NULL
;
649 bt_logging_level log_level
= lttng_live_msg_iter
->log_level
;
650 bt_self_component
*self_comp
= lttng_live_msg_iter
->self_comp
;
653 BT_ASSERT_DBG(ts_ns
);
655 BT_COMP_LOGD("Getting message's timestamp: iter-data-addr=%p, msg-addr=%p, "
656 "last-msg-ts=%" PRId64
, lttng_live_msg_iter
, msg
,
659 switch (bt_message_get_type(msg
)) {
660 case BT_MESSAGE_TYPE_EVENT
:
661 clock_class
= bt_message_event_borrow_stream_class_default_clock_class_const(
663 BT_ASSERT_DBG(clock_class
);
665 clock_snapshot
= bt_message_event_borrow_default_clock_snapshot_const(
668 case BT_MESSAGE_TYPE_PACKET_BEGINNING
:
669 clock_class
= bt_message_packet_beginning_borrow_stream_class_default_clock_class_const(
671 BT_ASSERT(clock_class
);
673 clock_snapshot
= bt_message_packet_beginning_borrow_default_clock_snapshot_const(
676 case BT_MESSAGE_TYPE_PACKET_END
:
677 clock_class
= bt_message_packet_end_borrow_stream_class_default_clock_class_const(
679 BT_ASSERT(clock_class
);
681 clock_snapshot
= bt_message_packet_end_borrow_default_clock_snapshot_const(
684 case BT_MESSAGE_TYPE_DISCARDED_EVENTS
:
685 clock_class
= bt_message_discarded_events_borrow_stream_class_default_clock_class_const(
687 BT_ASSERT(clock_class
);
689 clock_snapshot
= bt_message_discarded_events_borrow_beginning_default_clock_snapshot_const(
692 case BT_MESSAGE_TYPE_DISCARDED_PACKETS
:
693 clock_class
= bt_message_discarded_packets_borrow_stream_class_default_clock_class_const(
695 BT_ASSERT(clock_class
);
697 clock_snapshot
= bt_message_discarded_packets_borrow_beginning_default_clock_snapshot_const(
700 case BT_MESSAGE_TYPE_MESSAGE_ITERATOR_INACTIVITY
:
701 clock_snapshot
= bt_message_message_iterator_inactivity_borrow_default_clock_snapshot_const(
705 /* All the other messages have a higher priority */
706 BT_COMP_LOGD_STR("Message has no timestamp: using the last message timestamp.");
707 *ts_ns
= last_msg_ts_ns
;
711 clock_class
= bt_clock_snapshot_borrow_clock_class_const(clock_snapshot
);
712 BT_ASSERT_DBG(clock_class
);
714 ret
= bt_clock_snapshot_get_ns_from_origin(clock_snapshot
, ts_ns
);
716 BT_COMP_LOGE("Cannot get nanoseconds from Epoch of clock snapshot: "
717 "clock-snapshot-addr=%p", clock_snapshot
);
728 BT_COMP_LOGD("Found message's timestamp: "
729 "iter-data-addr=%p, msg-addr=%p, "
730 "last-msg-ts=%" PRId64
", ts=%" PRId64
,
731 lttng_live_msg_iter
, msg
, last_msg_ts_ns
, *ts_ns
);
738 enum lttng_live_iterator_status
lttng_live_iterator_next_handle_one_active_data_stream(
739 struct lttng_live_msg_iter
*lttng_live_msg_iter
,
740 struct lttng_live_stream_iterator
*lttng_live_stream
,
741 bt_message
**message
)
743 enum lttng_live_iterator_status ret
= LTTNG_LIVE_ITERATOR_STATUS_OK
;
744 bt_logging_level log_level
= lttng_live_msg_iter
->log_level
;
745 bt_self_component
*self_comp
= lttng_live_msg_iter
->self_comp
;
746 enum bt_msg_iter_status status
;
747 uint64_t session_idx
, trace_idx
;
749 for (session_idx
= 0; session_idx
< lttng_live_msg_iter
->sessions
->len
;
751 struct lttng_live_session
*session
=
752 g_ptr_array_index(lttng_live_msg_iter
->sessions
, session_idx
);
754 if (session
->new_streams_needed
) {
755 ret
= LTTNG_LIVE_ITERATOR_STATUS_CONTINUE
;
758 for (trace_idx
= 0; trace_idx
< session
->traces
->len
;
760 struct lttng_live_trace
*trace
=
761 g_ptr_array_index(session
->traces
, trace_idx
);
762 if (trace
->new_metadata_needed
) {
763 ret
= LTTNG_LIVE_ITERATOR_STATUS_CONTINUE
;
769 if (lttng_live_stream
->state
!= LTTNG_LIVE_STREAM_ACTIVE_DATA
) {
770 ret
= LTTNG_LIVE_ITERATOR_STATUS_ERROR
;
774 status
= bt_msg_iter_get_next_message(lttng_live_stream
->msg_iter
,
775 lttng_live_msg_iter
->self_msg_iter
, message
);
777 case BT_MSG_ITER_STATUS_EOF
:
778 ret
= LTTNG_LIVE_ITERATOR_STATUS_END
;
780 case BT_MSG_ITER_STATUS_OK
:
781 ret
= LTTNG_LIVE_ITERATOR_STATUS_OK
;
783 case BT_MSG_ITER_STATUS_AGAIN
:
785 * Continue immediately (end of packet). The next
786 * get_index may return AGAIN to delay the following
789 ret
= LTTNG_LIVE_ITERATOR_STATUS_CONTINUE
;
791 case BT_MSG_ITER_STATUS_INVAL
:
792 /* No argument provided by the user, so don't return INVAL. */
793 case BT_MSG_ITER_STATUS_ERROR
:
795 ret
= LTTNG_LIVE_ITERATOR_STATUS_ERROR
;
796 BT_COMP_LOGW("CTF msg iterator return an error or failed msg_iter=%p",
797 lttng_live_stream
->msg_iter
);
806 enum lttng_live_iterator_status
lttng_live_iterator_close_stream(
807 struct lttng_live_msg_iter
*lttng_live_msg_iter
,
808 struct lttng_live_stream_iterator
*stream_iter
,
809 bt_message
**curr_msg
)
811 enum lttng_live_iterator_status live_status
=
812 LTTNG_LIVE_ITERATOR_STATUS_OK
;
814 * The viewer has hung up on us so we are closing the stream. The
815 * `bt_msg_iter` should simply realize that it needs to close the
816 * stream properly by emitting the necessary stream end message.
818 enum bt_msg_iter_status status
= bt_msg_iter_get_next_message(
819 stream_iter
->msg_iter
, lttng_live_msg_iter
->self_msg_iter
,
822 if (status
== BT_MSG_ITER_STATUS_ERROR
) {
823 live_status
= LTTNG_LIVE_ITERATOR_STATUS_ERROR
;
827 BT_ASSERT(status
== BT_MSG_ITER_STATUS_OK
);
835 * handle_no_data_streams()
837 * - for each ACTIVE_NO_DATA stream:
838 * - query relayd for stream data, or quiescence info.
839 * - if need metadata, get metadata, goto retry.
840 * - if new stream, get new stream as ACTIVE_NO_DATA, goto retry
841 * - if quiescent, move to QUIESCENT streams
842 * - if fetched data, move to ACTIVE_DATA streams
843 * (at this point each stream either has data, or is quiescent)
847 * handle_new_streams_and_metadata()
848 * - query relayd for known streams, add them as ACTIVE_NO_DATA
849 * - query relayd for metadata
851 * call handle_active_no_data_streams()
853 * handle_quiescent_streams()
854 * - if at least one stream is ACTIVE_DATA:
855 * - peek stream event with lowest timestamp -> next_ts
856 * - for each quiescent stream
857 * - if next_ts >= quiescent end
858 * - set state to ACTIVE_NO_DATA
860 * - for each quiescent stream
861 * - set state to ACTIVE_NO_DATA
863 * call handle_active_no_data_streams()
865 * handle_active_data_streams()
866 * - if at least one stream is ACTIVE_DATA:
867 * - get stream event with lowest timestamp from heap
868 * - make that stream event the current message.
869 * - move this stream heap position to its next event
870 * - if we need to fetch data from relayd, move
871 * stream to ACTIVE_NO_DATA.
875 * end criterion: ctrl-c on client. If relayd exits or the session
876 * closes on the relay daemon side, we keep on waiting for streams.
877 * Eventually handle --end timestamp (also an end criterion).
879 * When disconnected from relayd: try to re-connect endlessly.
882 enum lttng_live_iterator_status
lttng_live_iterator_next_msg_on_stream(
883 struct lttng_live_msg_iter
*lttng_live_msg_iter
,
884 struct lttng_live_stream_iterator
*stream_iter
,
885 bt_message
**curr_msg
)
887 bt_logging_level log_level
= lttng_live_msg_iter
->log_level
;
888 bt_self_component
*self_comp
= lttng_live_msg_iter
->self_comp
;
889 enum lttng_live_iterator_status live_status
;
891 if (stream_iter
->has_stream_hung_up
) {
893 * The stream has hung up and the stream was properly closed
894 * during the last call to the current function. Return _END
895 * status now so that this stream iterator is removed for the
896 * stream iterator list.
898 live_status
= LTTNG_LIVE_ITERATOR_STATUS_END
;
903 print_stream_state(stream_iter
);
904 live_status
= lttng_live_iterator_handle_new_streams_and_metadata(
905 lttng_live_msg_iter
);
906 if (live_status
!= LTTNG_LIVE_ITERATOR_STATUS_OK
) {
909 live_status
= lttng_live_iterator_next_handle_one_no_data_stream(
910 lttng_live_msg_iter
, stream_iter
);
912 if (live_status
!= LTTNG_LIVE_ITERATOR_STATUS_OK
) {
913 if (live_status
== LTTNG_LIVE_ITERATOR_STATUS_END
) {
915 * We overwrite `live_status` since `curr_msg` is
916 * likely set to a valid message in this function.
918 live_status
= lttng_live_iterator_close_stream(
919 lttng_live_msg_iter
, stream_iter
, curr_msg
);
923 live_status
= lttng_live_iterator_next_handle_one_quiescent_stream(
924 lttng_live_msg_iter
, stream_iter
, curr_msg
);
925 if (live_status
!= LTTNG_LIVE_ITERATOR_STATUS_OK
) {
926 BT_ASSERT(!*curr_msg
);
932 live_status
= lttng_live_iterator_next_handle_one_active_data_stream(
933 lttng_live_msg_iter
, stream_iter
, curr_msg
);
934 if (live_status
!= LTTNG_LIVE_ITERATOR_STATUS_OK
) {
935 BT_ASSERT(!*curr_msg
);
939 if (live_status
== LTTNG_LIVE_ITERATOR_STATUS_CONTINUE
) {
947 enum lttng_live_iterator_status
next_stream_iterator_for_trace(
948 struct lttng_live_msg_iter
*lttng_live_msg_iter
,
949 struct lttng_live_trace
*live_trace
,
950 struct lttng_live_stream_iterator
**youngest_trace_stream_iter
)
952 struct lttng_live_stream_iterator
*youngest_candidate_stream_iter
= NULL
;
953 bt_logging_level log_level
= lttng_live_msg_iter
->log_level
;
954 bt_self_component
*self_comp
= lttng_live_msg_iter
->self_comp
;
955 enum lttng_live_iterator_status stream_iter_status
;;
956 int64_t youngest_candidate_msg_ts
= INT64_MAX
;
957 uint64_t stream_iter_idx
;
959 BT_ASSERT_DBG(live_trace
);
960 BT_ASSERT_DBG(live_trace
->stream_iterators
);
962 * Update the current message of every stream iterators of this trace.
963 * The current msg of every stream must have a timestamp equal or
964 * larger than the last message returned by this iterator. We must
965 * ensure monotonicity.
968 while (stream_iter_idx
< live_trace
->stream_iterators
->len
) {
969 bool stream_iter_is_ended
= false;
970 struct lttng_live_stream_iterator
*stream_iter
=
971 g_ptr_array_index(live_trace
->stream_iterators
,
975 * Find if there is are now current message for this stream
978 while (!stream_iter
->current_msg
) {
979 bt_message
*msg
= NULL
;
980 int64_t curr_msg_ts_ns
= INT64_MAX
;
981 stream_iter_status
= lttng_live_iterator_next_msg_on_stream(
982 lttng_live_msg_iter
, stream_iter
, &msg
);
984 BT_COMP_LOGD("live stream iterator returned status :%s",
985 print_live_iterator_status(stream_iter_status
));
986 if (stream_iter_status
== LTTNG_LIVE_ITERATOR_STATUS_END
) {
987 stream_iter_is_ended
= true;
991 if (stream_iter_status
!= LTTNG_LIVE_ITERATOR_STATUS_OK
) {
998 * Get the timestamp in nanoseconds from origin of this
1001 live_get_msg_ts_ns(stream_iter
, lttng_live_msg_iter
,
1002 msg
, lttng_live_msg_iter
->last_msg_ts_ns
,
1006 * Check if the message of the current live stream
1007 * iterator occured at the exact same time or after the
1008 * last message returned by this component's message
1009 * iterator. If not, we return an error.
1011 if (curr_msg_ts_ns
>= lttng_live_msg_iter
->last_msg_ts_ns
) {
1012 stream_iter
->current_msg
= msg
;
1013 stream_iter
->current_msg_ts_ns
= curr_msg_ts_ns
;
1016 * We received a message in the past. To ensure
1017 * monotonicity, we can't send it forward.
1019 BT_COMP_LOGE("Message's timestamp is less than "
1020 "lttng-live's message iterator's last "
1021 "returned timestamp: "
1022 "lttng-live-msg-iter-addr=%p, ts=%" PRId64
", "
1023 "last-msg-ts=%" PRId64
,
1024 lttng_live_msg_iter
, curr_msg_ts_ns
,
1025 lttng_live_msg_iter
->last_msg_ts_ns
);
1026 stream_iter_status
= LTTNG_LIVE_ITERATOR_STATUS_ERROR
;
1031 BT_ASSERT_DBG(stream_iter
!= youngest_candidate_stream_iter
);
1033 if (!stream_iter_is_ended
) {
1034 if (G_UNLIKELY(youngest_candidate_stream_iter
== NULL
) ||
1035 stream_iter
->current_msg_ts_ns
< youngest_candidate_msg_ts
) {
1037 * Update the current best candidate message
1038 * for the stream iterator of this live trace
1039 * to be forwarded downstream.
1041 youngest_candidate_msg_ts
= stream_iter
->current_msg_ts_ns
;
1042 youngest_candidate_stream_iter
= stream_iter
;
1043 } else if (stream_iter
->current_msg_ts_ns
== youngest_candidate_msg_ts
) {
1045 * Order the messages in an arbitrary but
1046 * deterministic way.
1048 BT_ASSERT_DBG(stream_iter
!= youngest_candidate_stream_iter
);
1049 int ret
= common_muxing_compare_messages(
1050 stream_iter
->current_msg
,
1051 youngest_candidate_stream_iter
->current_msg
);
1054 * The `youngest_candidate_stream_iter->current_msg`
1055 * should go first. Update the next
1056 * iterator and the current timestamp.
1058 youngest_candidate_msg_ts
= stream_iter
->current_msg_ts_ns
;
1059 youngest_candidate_stream_iter
= stream_iter
;
1060 } else if (ret
== 0) {
1062 * Unable to pick which one should go
1065 BT_COMP_LOGW("Cannot deterministically pick next live stream message iterator because they have identical next messages: "
1066 "stream-iter-addr=%p"
1067 "stream-iter-addr=%p",
1069 youngest_candidate_stream_iter
);
1076 * The live stream iterator has ended. That
1077 * iterator is removed from the array, but
1078 * there is no need to increment
1079 * stream_iter_idx as
1080 * g_ptr_array_remove_index_fast replaces the
1081 * removed element with the array's last
1084 g_ptr_array_remove_index_fast(
1085 live_trace
->stream_iterators
,
1090 if (youngest_candidate_stream_iter
) {
1091 *youngest_trace_stream_iter
= youngest_candidate_stream_iter
;
1092 stream_iter_status
= LTTNG_LIVE_ITERATOR_STATUS_OK
;
1095 * The only case where we don't have a candidate for this trace
1096 * is if we reached the end of all the iterators.
1098 BT_ASSERT(live_trace
->stream_iterators
->len
== 0);
1099 stream_iter_status
= LTTNG_LIVE_ITERATOR_STATUS_END
;
1103 return stream_iter_status
;
1107 enum lttng_live_iterator_status
next_stream_iterator_for_session(
1108 struct lttng_live_msg_iter
*lttng_live_msg_iter
,
1109 struct lttng_live_session
*session
,
1110 struct lttng_live_stream_iterator
**youngest_session_stream_iter
)
1112 bt_self_component
*self_comp
= lttng_live_msg_iter
->self_comp
;
1113 bt_logging_level log_level
= lttng_live_msg_iter
->log_level
;
1114 enum lttng_live_iterator_status stream_iter_status
;
1115 uint64_t trace_idx
= 0;
1116 int64_t youngest_candidate_msg_ts
= INT64_MAX
;
1117 struct lttng_live_stream_iterator
*youngest_candidate_stream_iter
= NULL
;
1120 * Make sure we are attached to the session and look for new streams
1123 stream_iter_status
= lttng_live_get_session(lttng_live_msg_iter
, session
);
1124 if (stream_iter_status
!= LTTNG_LIVE_ITERATOR_STATUS_OK
&&
1125 stream_iter_status
!= LTTNG_LIVE_ITERATOR_STATUS_CONTINUE
&&
1126 stream_iter_status
!= LTTNG_LIVE_ITERATOR_STATUS_END
) {
1130 BT_ASSERT_DBG(session
->traces
);
1132 while (trace_idx
< session
->traces
->len
) {
1133 bool trace_is_ended
= false;
1134 struct lttng_live_stream_iterator
*stream_iter
;
1135 struct lttng_live_trace
*trace
=
1136 g_ptr_array_index(session
->traces
, trace_idx
);
1138 stream_iter_status
= next_stream_iterator_for_trace(
1139 lttng_live_msg_iter
, trace
, &stream_iter
);
1140 if (stream_iter_status
== LTTNG_LIVE_ITERATOR_STATUS_END
) {
1142 * All the live stream iterators for this trace are
1143 * ENDed. Remove the trace from this session.
1145 trace_is_ended
= true;
1146 } else if (stream_iter_status
!= LTTNG_LIVE_ITERATOR_STATUS_OK
) {
1150 if (!trace_is_ended
) {
1151 BT_ASSERT_DBG(stream_iter
);
1153 if (G_UNLIKELY(youngest_candidate_stream_iter
== NULL
) ||
1154 stream_iter
->current_msg_ts_ns
< youngest_candidate_msg_ts
) {
1155 youngest_candidate_msg_ts
= stream_iter
->current_msg_ts_ns
;
1156 youngest_candidate_stream_iter
= stream_iter
;
1157 } else if (stream_iter
->current_msg_ts_ns
== youngest_candidate_msg_ts
) {
1159 * Order the messages in an arbitrary but
1160 * deterministic way.
1162 int ret
= common_muxing_compare_messages(
1163 stream_iter
->current_msg
,
1164 youngest_candidate_stream_iter
->current_msg
);
1167 * The `youngest_candidate_stream_iter->current_msg`
1168 * should go first. Update the next iterator
1169 * and the current timestamp.
1171 youngest_candidate_msg_ts
= stream_iter
->current_msg_ts_ns
;
1172 youngest_candidate_stream_iter
= stream_iter
;
1173 } else if (ret
== 0) {
1174 /* Unable to pick which one should go first. */
1175 BT_COMP_LOGW("Cannot deterministically pick next live stream message iterator because they have identical next messages: "
1176 "stream-iter-addr=%p" "stream-iter-addr=%p",
1177 stream_iter
, youngest_candidate_stream_iter
);
1183 * trace_idx is not incremented since
1184 * g_ptr_array_remove_index_fast replaces the
1185 * element at trace_idx with the array's last element.
1187 g_ptr_array_remove_index_fast(session
->traces
,
1191 if (youngest_candidate_stream_iter
) {
1192 *youngest_session_stream_iter
= youngest_candidate_stream_iter
;
1193 stream_iter_status
= LTTNG_LIVE_ITERATOR_STATUS_OK
;
1196 * The only cases where we don't have a candidate for this
1198 * 1. if we reached the end of all the iterators of all the
1199 * traces of this session,
1200 * 2. if we never had live stream iterator in the first place.
1202 * In either cases, we return END.
1204 BT_ASSERT(session
->traces
->len
== 0);
1205 stream_iter_status
= LTTNG_LIVE_ITERATOR_STATUS_END
;
1208 return stream_iter_status
;
1212 void put_messages(bt_message_array_const msgs
, uint64_t count
)
1216 for (i
= 0; i
< count
; i
++) {
1217 BT_MESSAGE_PUT_REF_AND_RESET(msgs
[i
]);
1222 bt_component_class_message_iterator_next_method_status
lttng_live_msg_iter_next(
1223 bt_self_message_iterator
*self_msg_it
,
1224 bt_message_array_const msgs
, uint64_t capacity
,
1227 bt_component_class_message_iterator_next_method_status status
;
1228 struct lttng_live_msg_iter
*lttng_live_msg_iter
=
1229 bt_self_message_iterator_get_data(self_msg_it
);
1230 struct lttng_live_component
*lttng_live
=
1231 lttng_live_msg_iter
->lttng_live_comp
;
1232 bt_self_component
*self_comp
= lttng_live_msg_iter
->self_comp
;
1233 bt_logging_level log_level
= lttng_live_msg_iter
->log_level
;
1234 enum lttng_live_iterator_status stream_iter_status
;
1235 uint64_t session_idx
;
1239 BT_ASSERT_DBG(lttng_live_msg_iter
);
1242 * Clear all the invalid message reference that might be left over in
1245 memset(msgs
, 0, capacity
* sizeof(*msgs
));
1248 * If no session are exposed on the relay found at the url provided by
1249 * the user, session count will be 0. In this case, we return status
1250 * end to return gracefully.
1252 if (lttng_live_msg_iter
->sessions
->len
== 0) {
1253 if (lttng_live
->params
.sess_not_found_act
!=
1254 SESSION_NOT_FOUND_ACTION_CONTINUE
) {
1255 status
= BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_END
;
1259 * The are no more active session for this session
1260 * name. Retry to create a viewer session for the
1261 * requested session name.
1263 if (lttng_live_create_viewer_session(lttng_live_msg_iter
)) {
1264 status
= BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_ERROR
;
1270 if (lttng_live_msg_iter
->active_stream_iter
== 0) {
1271 lttng_live_force_new_streams_and_metadata(lttng_live_msg_iter
);
1275 * Here the muxing of message is done.
1277 * We need to iterate over all the streams of all the traces of all the
1278 * viewer sessions in order to get the message with the smallest
1279 * timestamp. In this case, a session is a viewer session and there is
1280 * one viewer session per consumer daemon. (UST 32bit, UST 64bit and/or
1281 * kernel). Each viewer session can have multiple traces, for example,
1282 * 64bit UST viewer sessions could have multiple per-pid traces.
1284 * We iterate over the streams of each traces to update and see what is
1285 * their next message's timestamp. From those timestamps, we select the
1286 * message with the smallest timestamp as the best candidate message
1287 * for that trace and do the same thing across all the sessions.
1289 * We then compare the timestamp of best candidate message of all the
1290 * sessions to pick the message with the smallest timestamp and we
1293 while (*count
< capacity
) {
1294 struct lttng_live_stream_iterator
*youngest_stream_iter
= NULL
,
1295 *candidate_stream_iter
= NULL
;
1296 int64_t youngest_msg_ts_ns
= INT64_MAX
;
1298 BT_ASSERT_DBG(lttng_live_msg_iter
->sessions
);
1300 while (session_idx
< lttng_live_msg_iter
->sessions
->len
) {
1301 struct lttng_live_session
*session
=
1302 g_ptr_array_index(lttng_live_msg_iter
->sessions
,
1305 /* Find the best candidate message to send downstream. */
1306 stream_iter_status
= next_stream_iterator_for_session(
1307 lttng_live_msg_iter
, session
,
1308 &candidate_stream_iter
);
1310 /* If we receive an END status, it means that either:
1311 * - Those traces never had active streams (UST with no
1312 * data produced yet),
1313 * - All live stream iterators have ENDed.*/
1314 if (stream_iter_status
== LTTNG_LIVE_ITERATOR_STATUS_END
) {
1315 if (session
->closed
&& session
->traces
->len
== 0) {
1317 * Remove the session from the list.
1318 * session_idx is not modified since
1319 * g_ptr_array_remove_index_fast
1320 * replaces the the removed element with
1321 * the array's last element.
1323 g_ptr_array_remove_index_fast(
1324 lttng_live_msg_iter
->sessions
,
1332 if (stream_iter_status
!= LTTNG_LIVE_ITERATOR_STATUS_OK
) {
1336 if (G_UNLIKELY(youngest_stream_iter
== NULL
) ||
1337 candidate_stream_iter
->current_msg_ts_ns
< youngest_msg_ts_ns
) {
1338 youngest_msg_ts_ns
= candidate_stream_iter
->current_msg_ts_ns
;
1339 youngest_stream_iter
= candidate_stream_iter
;
1340 } else if (candidate_stream_iter
->current_msg_ts_ns
== youngest_msg_ts_ns
) {
1342 * The currently selected message to be sent
1343 * downstream next has the exact same timestamp
1344 * that of the current candidate message. We
1345 * must break the tie in a predictable manner.
1347 BT_COMP_LOGD_STR("Two of the next message candidates have the same timestamps, pick one deterministically.");
1349 * Order the messages in an arbitrary but
1350 * deterministic way.
1352 int ret
= common_muxing_compare_messages(
1353 candidate_stream_iter
->current_msg
,
1354 youngest_stream_iter
->current_msg
);
1357 * The `candidate_stream_iter->current_msg`
1358 * should go first. Update the next
1359 * iterator and the current timestamp.
1361 youngest_msg_ts_ns
= candidate_stream_iter
->current_msg_ts_ns
;
1362 youngest_stream_iter
= candidate_stream_iter
;
1363 } else if (ret
== 0) {
1364 /* Unable to pick which one should go first. */
1365 BT_COMP_LOGW("Cannot deterministically pick next live stream message iterator because they have identical next messages: "
1366 "next-stream-iter-addr=%p" "candidate-stream-iter-addr=%p",
1367 youngest_stream_iter
, candidate_stream_iter
);
1374 if (!youngest_stream_iter
) {
1375 stream_iter_status
= LTTNG_LIVE_ITERATOR_STATUS_AGAIN
;
1379 BT_ASSERT_DBG(youngest_stream_iter
->current_msg
);
1380 /* Ensure monotonicity. */
1381 BT_ASSERT_DBG(lttng_live_msg_iter
->last_msg_ts_ns
<=
1382 youngest_stream_iter
->current_msg_ts_ns
);
1385 * Insert the next message to the message batch. This will set
1386 * stream iterator current messsage to NULL so that next time
1387 * we fetch the next message of that stream iterator
1389 BT_MESSAGE_MOVE_REF(msgs
[*count
], youngest_stream_iter
->current_msg
);
1392 /* Update the last timestamp in nanoseconds sent downstream. */
1393 lttng_live_msg_iter
->last_msg_ts_ns
= youngest_msg_ts_ns
;
1394 youngest_stream_iter
->current_msg_ts_ns
= INT64_MAX
;
1396 stream_iter_status
= LTTNG_LIVE_ITERATOR_STATUS_OK
;
1399 switch (stream_iter_status
) {
1400 case LTTNG_LIVE_ITERATOR_STATUS_OK
:
1401 case LTTNG_LIVE_ITERATOR_STATUS_AGAIN
:
1404 * We received a again status but we have some messages
1405 * to send downstream. We send them and return OK for
1406 * now. On the next call we return again if there are
1407 * still no new message to send.
1409 status
= BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_OK
;
1411 status
= BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_AGAIN
;
1414 case LTTNG_LIVE_ITERATOR_STATUS_END
:
1415 status
= BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_END
;
1417 case LTTNG_LIVE_ITERATOR_STATUS_NOMEM
:
1418 status
= BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_MEMORY_ERROR
;
1420 case LTTNG_LIVE_ITERATOR_STATUS_ERROR
:
1421 case LTTNG_LIVE_ITERATOR_STATUS_INVAL
:
1422 case LTTNG_LIVE_ITERATOR_STATUS_UNSUPPORTED
:
1423 status
= BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_ERROR
;
1424 /* Put all existing messages on error. */
1425 put_messages(msgs
, *count
);
1436 bt_component_class_message_iterator_initialize_method_status
lttng_live_msg_iter_init(
1437 bt_self_message_iterator
*self_msg_it
,
1438 bt_self_message_iterator_configuration
*config
,
1439 bt_self_component_source
*self_comp_src
,
1440 bt_self_component_port_output
*self_port
)
1442 bt_component_class_message_iterator_initialize_method_status ret
=
1443 BT_COMPONENT_CLASS_MESSAGE_ITERATOR_INITIALIZE_METHOD_STATUS_OK
;
1444 bt_self_component
*self_comp
=
1445 bt_self_component_source_as_self_component(self_comp_src
);
1446 struct lttng_live_component
*lttng_live
;
1447 struct lttng_live_msg_iter
*lttng_live_msg_iter
;
1448 bt_logging_level log_level
;
1450 BT_ASSERT(self_msg_it
);
1452 lttng_live
= bt_self_component_get_data(self_comp
);
1453 log_level
= lttng_live
->log_level
;
1454 self_comp
= lttng_live
->self_comp
;
1456 /* There can be only one downstream iterator at the same time. */
1457 BT_ASSERT(!lttng_live
->has_msg_iter
);
1458 lttng_live
->has_msg_iter
= true;
1460 lttng_live_msg_iter
= g_new0(struct lttng_live_msg_iter
, 1);
1461 if (!lttng_live_msg_iter
) {
1462 ret
= BT_COMPONENT_CLASS_MESSAGE_ITERATOR_INITIALIZE_METHOD_STATUS_ERROR
;
1466 lttng_live_msg_iter
->log_level
= lttng_live
->log_level
;
1467 lttng_live_msg_iter
->self_comp
= lttng_live
->self_comp
;
1468 lttng_live_msg_iter
->lttng_live_comp
= lttng_live
;
1469 lttng_live_msg_iter
->self_msg_iter
= self_msg_it
;
1471 lttng_live_msg_iter
->active_stream_iter
= 0;
1472 lttng_live_msg_iter
->last_msg_ts_ns
= INT64_MIN
;
1473 lttng_live_msg_iter
->sessions
= g_ptr_array_new_with_free_func(
1474 (GDestroyNotify
) lttng_live_destroy_session
);
1475 BT_ASSERT(lttng_live_msg_iter
->sessions
);
1477 lttng_live_msg_iter
->viewer_connection
=
1478 live_viewer_connection_create(lttng_live
->params
.url
->str
, false,
1479 lttng_live_msg_iter
, log_level
);
1480 if (!lttng_live_msg_iter
->viewer_connection
) {
1484 if (lttng_live_create_viewer_session(lttng_live_msg_iter
)) {
1487 if (lttng_live_msg_iter
->sessions
->len
== 0) {
1488 switch (lttng_live
->params
.sess_not_found_act
) {
1489 case SESSION_NOT_FOUND_ACTION_CONTINUE
:
1490 BT_COMP_LOGI("Unable to connect to the requested live viewer "
1491 "session. Keep trying to connect because of "
1492 "%s=\"%s\" component parameter: url=\"%s\"",
1493 SESS_NOT_FOUND_ACTION_PARAM
,
1494 SESS_NOT_FOUND_ACTION_CONTINUE_STR
,
1495 lttng_live
->params
.url
->str
);
1497 case SESSION_NOT_FOUND_ACTION_FAIL
:
1498 BT_COMP_LOGE("Unable to connect to the requested live viewer "
1499 "session. Fail the message iterator"
1500 "initialization because of %s=\"%s\" "
1501 "component parameter: url =\"%s\"",
1502 SESS_NOT_FOUND_ACTION_PARAM
,
1503 SESS_NOT_FOUND_ACTION_FAIL_STR
,
1504 lttng_live
->params
.url
->str
);
1506 case SESSION_NOT_FOUND_ACTION_END
:
1507 BT_COMP_LOGI("Unable to connect to the requested live viewer "
1508 "session. End gracefully at the first _next() "
1509 "call because of %s=\"%s\" component parameter: "
1510 "url=\"%s\"", SESS_NOT_FOUND_ACTION_PARAM
,
1511 SESS_NOT_FOUND_ACTION_END_STR
,
1512 lttng_live
->params
.url
->str
);
1519 bt_self_message_iterator_set_data(self_msg_it
, lttng_live_msg_iter
);
1523 ret
= BT_COMPONENT_CLASS_MESSAGE_ITERATOR_INITIALIZE_METHOD_STATUS_ERROR
;
1524 lttng_live_msg_iter_destroy(lttng_live_msg_iter
);
1529 static struct bt_param_validation_map_value_entry_descr list_sessions_params
[] = {
1530 { URL_PARAM
, BT_PARAM_VALIDATION_MAP_VALUE_ENTRY_MANDATORY
, { .type
= BT_VALUE_TYPE_STRING
} },
1531 BT_PARAM_VALIDATION_MAP_VALUE_ENTRY_END
1535 bt_component_class_query_method_status
lttng_live_query_list_sessions(
1536 const bt_value
*params
, const bt_value
**result
,
1537 bt_self_component_class
*self_comp_class
,
1538 bt_logging_level log_level
)
1540 bt_component_class_query_method_status status
;
1541 const bt_value
*url_value
= NULL
;
1543 struct live_viewer_connection
*viewer_connection
= NULL
;
1544 enum bt_param_validation_status validation_status
;
1545 gchar
*validate_error
= NULL
;
1547 validation_status
= bt_param_validation_validate(params
,
1548 list_sessions_params
, &validate_error
);
1549 if (validation_status
== BT_PARAM_VALIDATION_STATUS_MEMORY_ERROR
) {
1550 status
= BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_MEMORY_ERROR
;
1552 } else if (validation_status
== BT_PARAM_VALIDATION_STATUS_VALIDATION_ERROR
) {
1553 status
= BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_ERROR
;
1554 BT_COMP_CLASS_LOGE_APPEND_CAUSE(self_comp_class
, "%s", validate_error
);
1558 url_value
= bt_value_map_borrow_entry_value_const(params
, URL_PARAM
);
1559 url
= bt_value_string_get(url_value
);
1561 viewer_connection
= live_viewer_connection_create(url
, true, NULL
,
1563 if (!viewer_connection
) {
1564 status
= BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_ERROR
;
1568 status
= live_viewer_connection_list_sessions(viewer_connection
,
1570 if (status
!= BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_OK
) {
1577 BT_VALUE_PUT_REF_AND_RESET(*result
);
1580 status
= BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_ERROR
;
1584 if (viewer_connection
) {
1585 live_viewer_connection_destroy(viewer_connection
);
1588 g_free(validate_error
);
1594 bt_component_class_query_method_status
lttng_live_query_support_info(
1595 const bt_value
*params
, const bt_value
**result
,
1596 bt_logging_level log_level
)
1598 bt_component_class_query_method_status status
=
1599 BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_OK
;
1600 const bt_value
*input_type_value
;
1601 const bt_value
*input_value
;
1603 struct bt_common_lttng_live_url_parts parts
= { 0 };
1605 /* Used by the logging macros */
1606 __attribute__((unused
)) bt_self_component
*self_comp
= NULL
;
1609 input_type_value
= bt_value_map_borrow_entry_value_const(params
,
1611 if (!input_type_value
) {
1612 BT_COMP_LOGE("Missing expected `type` parameter.");
1616 if (!bt_value_is_string(input_type_value
)) {
1617 BT_COMP_LOGE("`type` parameter is not a string value.");
1621 if (strcmp(bt_value_string_get(input_type_value
), "string") != 0) {
1622 /* We don't handle file system paths */
1626 input_value
= bt_value_map_borrow_entry_value_const(params
, "input");
1628 BT_COMP_LOGE("Missing expected `input` parameter.");
1632 if (!bt_value_is_string(input_value
)) {
1633 BT_COMP_LOGE("`input` parameter is not a string value.");
1637 parts
= bt_common_parse_lttng_live_url(bt_value_string_get(input_value
),
1639 if (parts
.session_name
) {
1641 * Looks pretty much like an LTTng live URL: we got the
1642 * session name part, which forms a complete URL.
1648 *result
= bt_value_real_create_init(weight
);
1650 status
= BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_MEMORY_ERROR
;
1658 status
= BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_ERROR
;
1661 BT_ASSERT(!*result
);
1664 bt_common_destroy_lttng_live_url_parts(&parts
);
1669 bt_component_class_query_method_status
lttng_live_query(
1670 bt_self_component_class_source
*comp_class
,
1671 bt_private_query_executor
*priv_query_exec
,
1672 const char *object
, const bt_value
*params
,
1673 __attribute__((unused
)) void *method_data
,
1674 const bt_value
**result
)
1676 bt_component_class_query_method_status status
=
1677 BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_OK
;
1678 bt_self_component
*self_comp
= NULL
;
1679 bt_self_component_class
*self_comp_class
=
1680 bt_self_component_class_source_as_self_component_class(comp_class
);
1681 bt_logging_level log_level
= bt_query_executor_get_logging_level(
1682 bt_private_query_executor_as_query_executor_const(
1685 if (strcmp(object
, "sessions") == 0) {
1686 status
= lttng_live_query_list_sessions(params
, result
,
1687 self_comp_class
, log_level
);
1688 } else if (strcmp(object
, "babeltrace.support-info") == 0) {
1689 status
= lttng_live_query_support_info(params
, result
,
1692 BT_COMP_LOGI("Unknown query object `%s`", object
);
1693 status
= BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_UNKNOWN_OBJECT
;
1702 void lttng_live_component_destroy_data(struct lttng_live_component
*lttng_live
)
1707 if (lttng_live
->params
.url
) {
1708 g_string_free(lttng_live
->params
.url
, TRUE
);
1714 void lttng_live_component_finalize(bt_self_component_source
*component
)
1716 void *data
= bt_self_component_get_data(
1717 bt_self_component_source_as_self_component(component
));
1722 lttng_live_component_destroy_data(data
);
1726 enum session_not_found_action
parse_session_not_found_action_param(
1727 const bt_value
*no_session_param
)
1729 enum session_not_found_action action
;
1730 const char *no_session_act_str
= bt_value_string_get(no_session_param
);
1732 if (strcmp(no_session_act_str
, SESS_NOT_FOUND_ACTION_CONTINUE_STR
) == 0) {
1733 action
= SESSION_NOT_FOUND_ACTION_CONTINUE
;
1734 } else if (strcmp(no_session_act_str
, SESS_NOT_FOUND_ACTION_FAIL_STR
) == 0) {
1735 action
= SESSION_NOT_FOUND_ACTION_FAIL
;
1737 BT_ASSERT(strcmp(no_session_act_str
, SESS_NOT_FOUND_ACTION_END_STR
) == 0);
1738 action
= SESSION_NOT_FOUND_ACTION_END
;
1744 static struct bt_param_validation_value_descr inputs_elem_descr
= {
1745 .type
= BT_VALUE_TYPE_STRING
,
1748 static const char *sess_not_found_action_choices
[] = {
1749 SESS_NOT_FOUND_ACTION_CONTINUE_STR
,
1750 SESS_NOT_FOUND_ACTION_FAIL_STR
,
1751 SESS_NOT_FOUND_ACTION_END_STR
,
1754 static struct bt_param_validation_map_value_entry_descr params_descr
[] = {
1755 { INPUTS_PARAM
, BT_PARAM_VALIDATION_MAP_VALUE_ENTRY_MANDATORY
, { BT_VALUE_TYPE_ARRAY
, .array
= {
1758 .element_type
= &inputs_elem_descr
,
1760 { SESS_NOT_FOUND_ACTION_PARAM
, BT_PARAM_VALIDATION_MAP_VALUE_ENTRY_OPTIONAL
, { BT_VALUE_TYPE_STRING
, .string
= {
1761 .choices
= sess_not_found_action_choices
,
1763 BT_PARAM_VALIDATION_MAP_VALUE_ENTRY_END
1767 bt_component_class_initialize_method_status
lttng_live_component_create(
1768 const bt_value
*params
,
1769 bt_logging_level log_level
,
1770 bt_self_component
*self_comp
,
1771 struct lttng_live_component
**component
)
1773 struct lttng_live_component
*lttng_live
= NULL
;
1774 const bt_value
*inputs_value
;
1775 const bt_value
*url_value
;
1776 const bt_value
*value
;
1778 enum bt_param_validation_status validation_status
;
1779 gchar
*validation_error
= NULL
;
1780 bt_component_class_initialize_method_status status
;
1782 validation_status
= bt_param_validation_validate(params
, params_descr
,
1784 if (validation_status
== BT_PARAM_VALIDATION_STATUS_MEMORY_ERROR
) {
1785 status
= BT_COMPONENT_CLASS_INITIALIZE_METHOD_STATUS_MEMORY_ERROR
;
1787 } else if (validation_status
== BT_PARAM_VALIDATION_STATUS_VALIDATION_ERROR
) {
1788 BT_COMP_LOGE_APPEND_CAUSE(self_comp
, "%s", validation_error
);
1789 status
= BT_COMPONENT_CLASS_INITIALIZE_METHOD_STATUS_ERROR
;
1793 lttng_live
= g_new0(struct lttng_live_component
, 1);
1795 status
= BT_COMPONENT_CLASS_INITIALIZE_METHOD_STATUS_MEMORY_ERROR
;
1798 lttng_live
->log_level
= log_level
;
1799 lttng_live
->self_comp
= self_comp
;
1800 lttng_live
->max_query_size
= MAX_QUERY_SIZE
;
1801 lttng_live
->has_msg_iter
= false;
1804 bt_value_map_borrow_entry_value_const(params
, INPUTS_PARAM
);
1806 bt_value_array_borrow_element_by_index_const(inputs_value
, 0);
1807 url
= bt_value_string_get(url_value
);
1809 lttng_live
->params
.url
= g_string_new(url
);
1810 if (!lttng_live
->params
.url
) {
1811 status
= BT_COMPONENT_CLASS_INITIALIZE_METHOD_STATUS_MEMORY_ERROR
;
1815 value
= bt_value_map_borrow_entry_value_const(params
,
1816 SESS_NOT_FOUND_ACTION_PARAM
);
1818 lttng_live
->params
.sess_not_found_act
=
1819 parse_session_not_found_action_param(value
);
1821 BT_COMP_LOGI("Optional `%s` parameter is missing: "
1822 "defaulting to `%s`.",
1823 SESS_NOT_FOUND_ACTION_PARAM
,
1824 SESS_NOT_FOUND_ACTION_CONTINUE_STR
);
1825 lttng_live
->params
.sess_not_found_act
=
1826 SESSION_NOT_FOUND_ACTION_CONTINUE
;
1829 status
= BT_COMPONENT_CLASS_INITIALIZE_METHOD_STATUS_OK
;
1833 lttng_live_component_destroy_data(lttng_live
);
1836 g_free(validation_error
);
1838 *component
= lttng_live
;
1843 bt_component_class_initialize_method_status
lttng_live_component_init(
1844 bt_self_component_source
*self_comp_src
,
1845 bt_self_component_source_configuration
*config
,
1846 const bt_value
*params
,
1847 __attribute__((unused
)) void *init_method_data
)
1849 struct lttng_live_component
*lttng_live
;
1850 bt_component_class_initialize_method_status ret
;
1851 bt_self_component
*self_comp
=
1852 bt_self_component_source_as_self_component(self_comp_src
);
1853 bt_logging_level log_level
= bt_component_get_logging_level(
1854 bt_self_component_as_component(self_comp
));
1855 bt_self_component_add_port_status add_port_status
;
1857 ret
= lttng_live_component_create(params
, log_level
, self_comp
, <tng_live
);
1858 if (ret
!= BT_COMPONENT_CLASS_INITIALIZE_METHOD_STATUS_OK
) {
1862 add_port_status
= bt_self_component_source_add_output_port(
1863 self_comp_src
, "out", NULL
, NULL
);
1864 if (add_port_status
!= BT_SELF_COMPONENT_ADD_PORT_STATUS_OK
) {
1865 ret
= (int) add_port_status
;
1869 bt_self_component_set_data(self_comp
, lttng_live
);
1873 lttng_live_component_destroy_data(lttng_live
);