[babeltrace.git] / src / plugins / ctf / lttng-live / data-stream.c

/*
 * Copyright 2019 Francis Deslauriers <francis.deslauriers@efficios.com>
 * Copyright 2016 - Philippe Proulx <pproulx@efficios.com>
 * Copyright 2016 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
 * Copyright 2010-2011 - EfficiOS Inc. and Linux Foundation
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#define BT_COMP_LOG_SELF_COMP self_comp
#define BT_LOG_OUTPUT_LEVEL log_level
#define BT_LOG_TAG "PLUGIN/SRC.CTF.LTTNG-LIVE/DS"
#include "logging/comp-logging.h"

#include <inttypes.h>
#include <stdio.h>
#include <stdlib.h>

#include <glib.h>

#include <babeltrace2/babeltrace.h>

#include "../common/msg-iter/msg-iter.h"
#include "common/assert.h"
#include "compat/mman.h"
#include "data-stream.h"

#define STREAM_NAME_PREFIX	"stream-"

static
enum bt_msg_iter_medium_status medop_request_bytes(
		size_t request_sz, uint8_t **buffer_addr,
		size_t *buffer_sz, void *data)
{
	enum bt_msg_iter_medium_status status =
		BT_MSG_ITER_MEDIUM_STATUS_OK;
	struct lttng_live_stream_iterator *stream = data;
	struct lttng_live_trace *trace = stream->trace;
	struct lttng_live_session *session = trace->session;
	struct lttng_live_msg_iter *live_msg_iter = session->lttng_live_msg_iter;
	uint64_t recv_len = 0;
	uint64_t len_left;
	uint64_t read_len;

	if (stream->has_stream_hung_up) {
		status = BT_MSG_ITER_MEDIUM_STATUS_EOF;
		goto end;
	}

	len_left = stream->base_offset + stream->len - stream->offset;
	if (!len_left) {
		stream->state = LTTNG_LIVE_STREAM_ACTIVE_NO_DATA;
		status = BT_MSG_ITER_MEDIUM_STATUS_AGAIN;
		goto end;
	}

	read_len = MIN(request_sz, stream->buflen);
	read_len = MIN(read_len, len_left);
	status = lttng_live_get_stream_bytes(live_msg_iter,
			stream, stream->buf, stream->offset,
			read_len, &recv_len);
	*buffer_addr = stream->buf;
	*buffer_sz = recv_len;
	stream->offset += recv_len;
end:
	return status;
}

static
bt_stream *medop_borrow_stream(bt_stream_class *stream_class,
		int64_t stream_id, void *data)
{
	struct lttng_live_stream_iterator *lttng_live_stream = data;
	bt_logging_level log_level = lttng_live_stream->log_level;
	bt_self_component *self_comp = lttng_live_stream->self_comp;

	if (!lttng_live_stream->stream) {
		uint64_t stream_class_id = bt_stream_class_get_id(stream_class);

		BT_COMP_LOGI("Creating stream %s (ID: %" PRIu64 ") out of stream "
			"class %" PRId64, lttng_live_stream->name->str,
			stream_id, stream_class_id);

		if (stream_id < 0) {
			/*
			 * No stream instance ID in the stream. It's possible
			 * to encounter this situation with older version of
			 * LTTng. In these cases, use the viewer_stream_id that
			 * is unique for a live viewer session.
			 */
			lttng_live_stream->stream = bt_stream_create_with_id(
				stream_class, lttng_live_stream->trace->trace,
				lttng_live_stream->viewer_stream_id);
		} else {
			lttng_live_stream->stream = bt_stream_create_with_id(
				stream_class, lttng_live_stream->trace->trace,
				(uint64_t) stream_id);
		}

		if (!lttng_live_stream->stream) {
			BT_COMP_LOGE_APPEND_CAUSE(self_comp,
				"Cannot create stream %s (stream class ID "
				"%" PRId64 ", stream ID %" PRIu64 ")",
				lttng_live_stream->name->str,
				stream_class_id, stream_id);
			goto end;
		}

		bt_stream_set_name(lttng_live_stream->stream,
			lttng_live_stream->name->str);
	}

end:
	return lttng_live_stream->stream;
}

static struct bt_msg_iter_medium_ops medops = {
	.request_bytes = medop_request_bytes,
	.seek = NULL,
	.borrow_stream = medop_borrow_stream,
};

BT_HIDDEN
enum lttng_live_iterator_status lttng_live_lazy_msg_init(
		struct lttng_live_session *session)
{
	struct lttng_live_component *lttng_live =
		session->lttng_live_msg_iter->lttng_live_comp;
	uint64_t trace_idx, stream_iter_idx;
	bt_logging_level log_level = session->log_level;
	bt_self_component *self_comp = session->self_comp;

	if (!session->lazy_stream_msg_init) {
		return LTTNG_LIVE_ITERATOR_STATUS_OK;
	}

	for (trace_idx = 0; trace_idx < session->traces->len; trace_idx++) {
		struct lttng_live_trace *trace =
			g_ptr_array_index(session->traces, trace_idx);

		for (stream_iter_idx = 0;
				stream_iter_idx < trace->stream_iterators->len;
				stream_iter_idx++) {
			struct ctf_trace_class *ctf_tc;
			struct lttng_live_stream_iterator *stream_iter =
				g_ptr_array_index(trace->stream_iterators,
					stream_iter_idx);

			if (stream_iter->msg_iter) {
				continue;
			}
			ctf_tc = ctf_metadata_decoder_borrow_ctf_trace_class(
				trace->metadata->decoder);
			stream_iter->msg_iter = bt_msg_iter_create(ctf_tc,
				lttng_live->max_query_size, medops, stream_iter,
				log_level, self_comp);
			if (!stream_iter->msg_iter) {
				BT_COMP_LOGE_APPEND_CAUSE(self_comp,
					"Failed to create CTF message iterator");
				goto error;
			}

			bt_msg_iter_set_emit_stream_end_message(
				stream_iter->msg_iter, true);
			bt_msg_iter_set_emit_stream_beginning_message(
				stream_iter->msg_iter, true);
		}
	}

	session->lazy_stream_msg_init = false;

	return LTTNG_LIVE_ITERATOR_STATUS_OK;

error:
	return LTTNG_LIVE_ITERATOR_STATUS_ERROR;
}

BT_HIDDEN
struct lttng_live_stream_iterator *lttng_live_stream_iterator_create(
		struct lttng_live_session *session,
		uint64_t ctf_trace_id,
		uint64_t stream_id)
{
	struct lttng_live_stream_iterator *stream_iter;
	struct lttng_live_component *lttng_live;
	struct lttng_live_trace *trace;
	bt_logging_level log_level;
	bt_self_component *self_comp;

	BT_ASSERT(session);
	BT_ASSERT(session->lttng_live_msg_iter);
	BT_ASSERT(session->lttng_live_msg_iter->lttng_live_comp);
	log_level = session->log_level;
	self_comp = session->self_comp;

	lttng_live = session->lttng_live_msg_iter->lttng_live_comp;

	stream_iter = g_new0(struct lttng_live_stream_iterator, 1);
	if (!stream_iter) {
		BT_COMP_LOGE_APPEND_CAUSE(self_comp,
			"Failed to allocate struct lttng_live_stream_iterator");
		goto error;
	}

	stream_iter->log_level = log_level;
	stream_iter->self_comp = self_comp;
	trace = lttng_live_borrow_trace(session, ctf_trace_id);
	if (!trace) {
		BT_COMP_LOGE_APPEND_CAUSE(self_comp,
			"Failed to borrow CTF trace.");
		goto error;
	}

	stream_iter->trace = trace;
	stream_iter->state = LTTNG_LIVE_STREAM_ACTIVE_NO_DATA;
	stream_iter->viewer_stream_id = stream_id;
	stream_iter->ctf_stream_class_id = -1ULL;
	stream_iter->last_inactivity_ts = INT64_MIN;

	if (trace->trace) {
		struct ctf_trace_class *ctf_tc =
			ctf_metadata_decoder_borrow_ctf_trace_class(
				trace->metadata->decoder);
		BT_ASSERT(!stream_iter->msg_iter);
		stream_iter->msg_iter = bt_msg_iter_create(ctf_tc,
			lttng_live->max_query_size, medops, stream_iter,
			log_level, self_comp);
		if (!stream_iter->msg_iter) {
			BT_COMP_LOGE_APPEND_CAUSE(self_comp,
				"Failed to create CTF message iterator");
			goto error;
		}

		bt_msg_iter_set_emit_stream_end_message(
			stream_iter->msg_iter, true);
		bt_msg_iter_set_emit_stream_beginning_message(
			stream_iter->msg_iter, true);
	}
	stream_iter->buf = g_new0(uint8_t, lttng_live->max_query_size);
	if (!stream_iter->buf) {
		BT_COMP_LOGE_APPEND_CAUSE(self_comp,
			"Failed to allocate live stream iterator buffer");
		goto error;
	}

	stream_iter->buflen = lttng_live->max_query_size;
	stream_iter->name = g_string_new(NULL);
	if (!stream_iter->name) {
		BT_COMP_LOGE_APPEND_CAUSE(self_comp,
			"Failed to allocate live stream iterator name buffer");
		goto error;
	}

	g_string_printf(stream_iter->name, STREAM_NAME_PREFIX "%" PRIu64,
		stream_iter->viewer_stream_id);
	g_ptr_array_add(trace->stream_iterators, stream_iter);

	/* Track the number of active stream iterator. */
	session->lttng_live_msg_iter->active_stream_iter++;

	goto end;
error:
	lttng_live_stream_iterator_destroy(stream_iter);
	stream_iter = NULL;
end:
	return stream_iter;
}

BT_HIDDEN
void lttng_live_stream_iterator_destroy(
		struct lttng_live_stream_iterator *stream_iter)
{
	if (!stream_iter) {
		return;
	}

	if (stream_iter->stream) {
		BT_STREAM_PUT_REF_AND_RESET(stream_iter->stream);
	}

	if (stream_iter->msg_iter) {
		bt_msg_iter_destroy(stream_iter->msg_iter);
	}
	g_free(stream_iter->buf);
	if (stream_iter->name) {
		g_string_free(stream_iter->name, TRUE);
	}

	bt_message_put_ref(stream_iter->current_msg);

	/* Track the number of active stream iterator. */
	stream_iter->trace->session->lttng_live_msg_iter->active_stream_iter--;

	/*
	 * Ensure we poke the trace metadata in the future, which is
	 * required to release the metadata reference on the trace.
	 */
	stream_iter->trace->new_metadata_needed = true;
	g_free(stream_iter);
}
Commit	Line	Data
7cdc2bab	1	/*
14f28187	2	* Copyright 2019 Francis Deslauriers <francis.deslauriers@efficios.com>
7cdc2bab MD	3	* Copyright 2016 - Philippe Proulx <pproulx@efficios.com>
	4	* Copyright 2016 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
	5	* Copyright 2010-2011 - EfficiOS Inc. and Linux Foundation
	6	*
	7	* Permission is hereby granted, free of charge, to any person obtaining a copy
	8	* of this software and associated documentation files (the "Software"), to deal
	9	* in the Software without restriction, including without limitation the rights
	10	* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
	11	* copies of the Software, and to permit persons to whom the Software is
	12	* furnished to do so, subject to the following conditions:
	13	*
	14	* The above copyright notice and this permission notice shall be included in
	15	* all copies or substantial portions of the Software.
	16	*
	17	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	18	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	19	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
	20	* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	21	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
	22	* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
	23	* SOFTWARE.
	24	*/
	25
2ece7dd0	26	#define BT_COMP_LOG_SELF_COMP self_comp
c01594de	27	#define BT_LOG_OUTPUT_LEVEL log_level
350ad6c1	28	#define BT_LOG_TAG "PLUGIN/SRC.CTF.LTTNG-LIVE/DS"
d9c39b0a	29	#include "logging/comp-logging.h"
020bc26f	30
3c22a242	31	#include <inttypes.h>
7cdc2bab	32	#include <stdio.h>
7cdc2bab	33	#include <stdlib.h>
3c22a242	34
7cdc2bab	35	#include <glib.h>
3c22a242	36
3fadfbc0	37	#include <babeltrace2/babeltrace.h>
3c22a242	38
d6e69534	39	#include "../common/msg-iter/msg-iter.h"
578e048b	40	#include "common/assert.h"
3c22a242	41	#include "compat/mman.h"
087bc060	42	#include "data-stream.h"
7cdc2bab	43
14f28187 FD	44	#define STREAM_NAME_PREFIX "stream-"
14f28187 FD	45
7cdc2bab	46	static
d6e69534	47	enum bt_msg_iter_medium_status medop_request_bytes(
7cdc2bab MD	48	size_t request_sz, uint8_t **buffer_addr,
	49	size_t buffer_sz, void data)
	50	{
d6e69534 PP	51	enum bt_msg_iter_medium_status status =
d6e69534 PP	52	BT_MSG_ITER_MEDIUM_STATUS_OK;
7cdc2bab MD	53	struct lttng_live_stream_iterator *stream = data;
	54	struct lttng_live_trace *trace = stream->trace;
	55	struct lttng_live_session *session = trace->session;
14f28187	56	struct lttng_live_msg_iter *live_msg_iter = session->lttng_live_msg_iter;
7cdc2bab MD	57	uint64_t recv_len = 0;
	58	uint64_t len_left;
	59	uint64_t read_len;
7cdc2bab	60
4a39caef FD	61	if (stream->has_stream_hung_up) {
	62	status = BT_MSG_ITER_MEDIUM_STATUS_EOF;
	63	goto end;
	64	}
	65
7cdc2bab MD	66	len_left = stream->base_offset + stream->len - stream->offset;
	67	if (!len_left) {
	68	stream->state = LTTNG_LIVE_STREAM_ACTIVE_NO_DATA;
d6e69534	69	status = BT_MSG_ITER_MEDIUM_STATUS_AGAIN;
4a39caef	70	goto end;
7cdc2bab	71	}
4a39caef	72
7cdc2bab MD	73	read_len = MIN(request_sz, stream->buflen);
7cdc2bab MD	74	read_len = MIN(read_len, len_left);
14f28187	75	status = lttng_live_get_stream_bytes(live_msg_iter,
7cdc2bab MD	76	stream, stream->buf, stream->offset,
7cdc2bab MD	77	read_len, &recv_len);
7cdc2bab MD	78	*buffer_addr = stream->buf;
	79	*buffer_sz = recv_len;
	80	stream->offset += recv_len;
4a39caef	81	end:
7cdc2bab MD	82	return status;
	83	}
	84
	85	static
14f28187 FD	86	bt_stream medop_borrow_stream(bt_stream_class stream_class,
14f28187 FD	87	int64_t stream_id, void *data)
7cdc2bab MD	88	{
7cdc2bab MD	89	struct lttng_live_stream_iterator *lttng_live_stream = data;
c01594de	90	bt_logging_level log_level = lttng_live_stream->log_level;
2ece7dd0	91	bt_self_component *self_comp = lttng_live_stream->self_comp;
7cdc2bab MD	92
7cdc2bab MD	93	if (!lttng_live_stream->stream) {
14f28187	94	uint64_t stream_class_id = bt_stream_class_get_id(stream_class);
b92735af	95
2ece7dd0	96	BT_COMP_LOGI("Creating stream %s (ID: %" PRIu64 ") out of stream "
14f28187 FD	97	"class %" PRId64, lttng_live_stream->name->str,
14f28187 FD	98	stream_id, stream_class_id);
b92735af	99
14f28187 FD	100	if (stream_id < 0) {
	101	/*
	102	* No stream instance ID in the stream. It's possible
	103	* to encounter this situation with older version of
	104	* LTTng. In these cases, use the viewer_stream_id that
	105	* is unique for a live viewer session.
	106	*/
	107	lttng_live_stream->stream = bt_stream_create_with_id(
	108	stream_class, lttng_live_stream->trace->trace,
	109	lttng_live_stream->viewer_stream_id);
b92735af	110	} else {
14f28187 FD	111	lttng_live_stream->stream = bt_stream_create_with_id(
	112	stream_class, lttng_live_stream->trace->trace,
	113	(uint64_t) stream_id);
b92735af	114	}
7cdc2bab	115
7cdc2bab	116	if (!lttng_live_stream->stream) {
1419db2b FD	117	BT_COMP_LOGE_APPEND_CAUSE(self_comp,
1419db2b FD	118	"Cannot create stream %s (stream class ID "
14f28187 FD	119	"%" PRId64 ", stream ID %" PRIu64 ")",
	120	lttng_live_stream->name->str,
	121	stream_class_id, stream_id);
b80991f6	122	goto end;
7cdc2bab	123	}
b80991f6	124
14f28187 FD	125	bt_stream_set_name(lttng_live_stream->stream,
14f28187 FD	126	lttng_live_stream->name->str);
7cdc2bab MD	127	}
7cdc2bab MD	128
b80991f6	129	end:
7cdc2bab MD	130	return lttng_live_stream->stream;
	131	}
	132
d6e69534	133	static struct bt_msg_iter_medium_ops medops = {
7cdc2bab	134	.request_bytes = medop_request_bytes,
14f28187 FD	135	.seek = NULL,
14f28187 FD	136	.borrow_stream = medop_borrow_stream,
7cdc2bab MD	137	};
	138
	139	BT_HIDDEN
14f28187	140	enum lttng_live_iterator_status lttng_live_lazy_msg_init(
7cdc2bab MD	141	struct lttng_live_session *session)
7cdc2bab MD	142	{
14f28187 FD	143	struct lttng_live_component *lttng_live =
	144	session->lttng_live_msg_iter->lttng_live_comp;
	145	uint64_t trace_idx, stream_iter_idx;
c01594de	146	bt_logging_level log_level = session->log_level;
2ece7dd0	147	bt_self_component *self_comp = session->self_comp;
7cdc2bab	148
d6e69534	149	if (!session->lazy_stream_msg_init) {
14f28187	150	return LTTNG_LIVE_ITERATOR_STATUS_OK;
7cdc2bab MD	151	}
7cdc2bab MD	152
14f28187 FD	153	for (trace_idx = 0; trace_idx < session->traces->len; trace_idx++) {
	154	struct lttng_live_trace *trace =
	155	g_ptr_array_index(session->traces, trace_idx);
	156
	157	for (stream_iter_idx = 0;
	158	stream_iter_idx < trace->stream_iterators->len;
	159	stream_iter_idx++) {
	160	struct ctf_trace_class *ctf_tc;
	161	struct lttng_live_stream_iterator *stream_iter =
	162	g_ptr_array_index(trace->stream_iterators,
0f1979c3	163	stream_iter_idx);
7cdc2bab	164
14f28187	165	if (stream_iter->msg_iter) {
7cdc2bab MD	166	continue;
7cdc2bab MD	167	}
14f28187	168	ctf_tc = ctf_metadata_decoder_borrow_ctf_trace_class(
0f1979c3	169	trace->metadata->decoder);
14f28187	170	stream_iter->msg_iter = bt_msg_iter_create(ctf_tc,
0f1979c3 FD	171	lttng_live->max_query_size, medops, stream_iter,
0f1979c3 FD	172	log_level, self_comp);
14f28187	173	if (!stream_iter->msg_iter) {
1419db2b FD	174	BT_COMP_LOGE_APPEND_CAUSE(self_comp,
1419db2b FD	175	"Failed to create CTF message iterator");
7cdc2bab MD	176	goto error;
7cdc2bab MD	177	}
3b75a1f2 FD	178
	179	bt_msg_iter_set_emit_stream_end_message(
	180	stream_iter->msg_iter, true);
	181	bt_msg_iter_set_emit_stream_beginning_message(
	182	stream_iter->msg_iter, true);
7cdc2bab MD	183	}
	184	}
	185
d6e69534	186	session->lazy_stream_msg_init = false;
7cdc2bab	187
14f28187	188	return LTTNG_LIVE_ITERATOR_STATUS_OK;
7cdc2bab MD	189
7cdc2bab MD	190	error:
14f28187	191	return LTTNG_LIVE_ITERATOR_STATUS_ERROR;
7cdc2bab MD	192	}
	193
	194	BT_HIDDEN
	195	struct lttng_live_stream_iterator *lttng_live_stream_iterator_create(
	196	struct lttng_live_session *session,
	197	uint64_t ctf_trace_id,
	198	uint64_t stream_id)
	199	{
14f28187 FD	200	struct lttng_live_stream_iterator *stream_iter;
14f28187 FD	201	struct lttng_live_component *lttng_live;
7cdc2bab	202	struct lttng_live_trace *trace;
c01594de	203	bt_logging_level log_level;
2ece7dd0	204	bt_self_component *self_comp;
7cdc2bab	205
14f28187 FD	206	BT_ASSERT(session);
	207	BT_ASSERT(session->lttng_live_msg_iter);
	208	BT_ASSERT(session->lttng_live_msg_iter->lttng_live_comp);
c01594de	209	log_level = session->log_level;
2ece7dd0	210	self_comp = session->self_comp;
14f28187 FD	211
	212	lttng_live = session->lttng_live_msg_iter->lttng_live_comp;
	213
	214	stream_iter = g_new0(struct lttng_live_stream_iterator, 1);
	215	if (!stream_iter) {
1419db2b FD	216	BT_COMP_LOGE_APPEND_CAUSE(self_comp,
1419db2b FD	217	"Failed to allocate struct lttng_live_stream_iterator");
14f28187 FD	218	goto error;
	219	}
	220
c01594de	221	stream_iter->log_level = log_level;
2ece7dd0	222	stream_iter->self_comp = self_comp;
14f28187	223	trace = lttng_live_borrow_trace(session, ctf_trace_id);
7cdc2bab	224	if (!trace) {
1419db2b FD	225	BT_COMP_LOGE_APPEND_CAUSE(self_comp,
1419db2b FD	226	"Failed to borrow CTF trace.");
7cdc2bab MD	227	goto error;
	228	}
	229
14f28187 FD	230	stream_iter->trace = trace;
	231	stream_iter->state = LTTNG_LIVE_STREAM_ACTIVE_NO_DATA;
	232	stream_iter->viewer_stream_id = stream_id;
	233	stream_iter->ctf_stream_class_id = -1ULL;
	234	stream_iter->last_inactivity_ts = INT64_MIN;
7cdc2bab MD	235
7cdc2bab MD	236	if (trace->trace) {
14f28187 FD	237	struct ctf_trace_class *ctf_tc =
14f28187 FD	238	ctf_metadata_decoder_borrow_ctf_trace_class(
0f1979c3	239	trace->metadata->decoder);
14f28187 FD	240	BT_ASSERT(!stream_iter->msg_iter);
14f28187 FD	241	stream_iter->msg_iter = bt_msg_iter_create(ctf_tc,
0f1979c3 FD	242	lttng_live->max_query_size, medops, stream_iter,
0f1979c3 FD	243	log_level, self_comp);
14f28187	244	if (!stream_iter->msg_iter) {
1419db2b FD	245	BT_COMP_LOGE_APPEND_CAUSE(self_comp,
1419db2b FD	246	"Failed to create CTF message iterator");
7cdc2bab MD	247	goto error;
7cdc2bab MD	248	}
3b75a1f2 FD	249
	250	bt_msg_iter_set_emit_stream_end_message(
	251	stream_iter->msg_iter, true);
	252	bt_msg_iter_set_emit_stream_beginning_message(
	253	stream_iter->msg_iter, true);
7cdc2bab	254	}
14f28187 FD	255	stream_iter->buf = g_new0(uint8_t, lttng_live->max_query_size);
14f28187 FD	256	if (!stream_iter->buf) {
1419db2b FD	257	BT_COMP_LOGE_APPEND_CAUSE(self_comp,
1419db2b FD	258	"Failed to allocate live stream iterator buffer");
14f28187 FD	259	goto error;
14f28187 FD	260	}
7cdc2bab	261
14f28187 FD	262	stream_iter->buflen = lttng_live->max_query_size;
	263	stream_iter->name = g_string_new(NULL);
	264	if (!stream_iter->name) {
1419db2b FD	265	BT_COMP_LOGE_APPEND_CAUSE(self_comp,
1419db2b FD	266	"Failed to allocate live stream iterator name buffer");
14f28187 FD	267	goto error;
	268	}
	269
	270	g_string_printf(stream_iter->name, STREAM_NAME_PREFIX "%" PRIu64,
0f1979c3	271	stream_iter->viewer_stream_id);
14f28187	272	g_ptr_array_add(trace->stream_iterators, stream_iter);
7cdc2bab	273
14f28187 FD	274	/* Track the number of active stream iterator. */
14f28187 FD	275	session->lttng_live_msg_iter->active_stream_iter++;
7cdc2bab MD	276
	277	goto end;
	278	error:
14f28187 FD	279	lttng_live_stream_iterator_destroy(stream_iter);
14f28187 FD	280	stream_iter = NULL;
7cdc2bab	281	end:
14f28187	282	return stream_iter;
7cdc2bab MD	283	}
	284
	285	BT_HIDDEN
14f28187 FD	286	void lttng_live_stream_iterator_destroy(
14f28187 FD	287	struct lttng_live_stream_iterator *stream_iter)
7cdc2bab	288	{
14f28187	289	if (!stream_iter) {
7cdc2bab MD	290	return;
	291	}
	292
14f28187 FD	293	if (stream_iter->stream) {
14f28187 FD	294	BT_STREAM_PUT_REF_AND_RESET(stream_iter->stream);
7cdc2bab MD	295	}
7cdc2bab MD	296
14f28187 FD	297	if (stream_iter->msg_iter) {
14f28187 FD	298	bt_msg_iter_destroy(stream_iter->msg_iter);
7cdc2bab	299	}
19bbdc9b	300	g_free(stream_iter->buf);
14f28187 FD	301	if (stream_iter->name) {
	302	g_string_free(stream_iter->name, TRUE);
	303	}
	304
	305	bt_message_put_ref(stream_iter->current_msg);
	306
	307	/* Track the number of active stream iterator. */
	308	stream_iter->trace->session->lttng_live_msg_iter->active_stream_iter--;
	309
7cdc2bab MD	310	/*
	311	* Ensure we poke the trace metadata in the future, which is
	312	* required to release the metadata reference on the trace.
	313	*/
14f28187 FD	314	stream_iter->trace->new_metadata_needed = true;
14f28187 FD	315	g_free(stream_iter);
7cdc2bab	316	}