[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 <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <glib.h>
#include <inttypes.h>
#include "compat/mman.h"
#include <babeltrace2/babeltrace.h>
#include "../common/msg-iter/msg-iter.h"
#include "common/assert.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	/*
bb18709b	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
5278d5ba	26	#define BT_COMP_LOG_SELF_COMP self_comp
1c0ceb65	27	#define BT_LOG_OUTPUT_LEVEL log_level
b03487ab	28	#define BT_LOG_TAG "PLUGIN/SRC.CTF.LTTNG-LIVE/DS"
3fa1b6a3	29	#include "logging/comp-logging.h"
020bc26f	30
7cdc2bab MD	31	#include <stdio.h>
	32	#include <stdint.h>
	33	#include <stdlib.h>
7cdc2bab MD	34	#include <glib.h>
7cdc2bab MD	35	#include <inttypes.h>
57952005	36	#include "compat/mman.h"
71c5da58	37	#include <babeltrace2/babeltrace.h>
b09a5592	38	#include "../common/msg-iter/msg-iter.h"
57952005	39	#include "common/assert.h"
7cdc2bab	40
087bc060	41	#include "data-stream.h"
7cdc2bab	42
bb18709b FD	43	#define STREAM_NAME_PREFIX "stream-"
bb18709b FD	44
7cdc2bab	45	static
b09a5592	46	enum bt_msg_iter_medium_status medop_request_bytes(
7cdc2bab MD	47	size_t request_sz, uint8_t **buffer_addr,
	48	size_t buffer_sz, void data)
	49	{
b09a5592 PP	50	enum bt_msg_iter_medium_status status =
b09a5592 PP	51	BT_MSG_ITER_MEDIUM_STATUS_OK;
7cdc2bab MD	52	struct lttng_live_stream_iterator *stream = data;
	53	struct lttng_live_trace *trace = stream->trace;
	54	struct lttng_live_session *session = trace->session;
bb18709b	55	struct lttng_live_msg_iter *live_msg_iter = session->lttng_live_msg_iter;
7cdc2bab MD	56	uint64_t recv_len = 0;
	57	uint64_t len_left;
	58	uint64_t read_len;
7cdc2bab	59
5b337d32 FD	60	if (stream->has_stream_hung_up) {
	61	status = BT_MSG_ITER_MEDIUM_STATUS_EOF;
	62	goto end;
	63	}
	64
7cdc2bab MD	65	len_left = stream->base_offset + stream->len - stream->offset;
	66	if (!len_left) {
	67	stream->state = LTTNG_LIVE_STREAM_ACTIVE_NO_DATA;
b09a5592	68	status = BT_MSG_ITER_MEDIUM_STATUS_AGAIN;
5b337d32	69	goto end;
7cdc2bab	70	}
5b337d32	71
7cdc2bab MD	72	read_len = MIN(request_sz, stream->buflen);
7cdc2bab MD	73	read_len = MIN(read_len, len_left);
bb18709b	74	status = lttng_live_get_stream_bytes(live_msg_iter,
7cdc2bab MD	75	stream, stream->buf, stream->offset,
7cdc2bab MD	76	read_len, &recv_len);
7cdc2bab MD	77	*buffer_addr = stream->buf;
	78	*buffer_sz = recv_len;
	79	stream->offset += recv_len;
5b337d32	80	end:
7cdc2bab MD	81	return status;
	82	}
	83
	84	static
bb18709b FD	85	bt_stream medop_borrow_stream(bt_stream_class stream_class,
bb18709b FD	86	int64_t stream_id, void *data)
7cdc2bab MD	87	{
7cdc2bab MD	88	struct lttng_live_stream_iterator *lttng_live_stream = data;
1c0ceb65	89	bt_logging_level log_level = lttng_live_stream->log_level;
5278d5ba	90	bt_self_component *self_comp = lttng_live_stream->self_comp;
7cdc2bab MD	91
7cdc2bab MD	92	if (!lttng_live_stream->stream) {
bb18709b	93	uint64_t stream_class_id = bt_stream_class_get_id(stream_class);
0659c536	94
5278d5ba	95	BT_COMP_LOGI("Creating stream %s (ID: %" PRIu64 ") out of stream "
bb18709b FD	96	"class %" PRId64, lttng_live_stream->name->str,
bb18709b FD	97	stream_id, stream_class_id);
0659c536	98
bb18709b FD	99	if (stream_id < 0) {
	100	/*
	101	* No stream instance ID in the stream. It's possible
	102	* to encounter this situation with older version of
	103	* LTTng. In these cases, use the viewer_stream_id that
	104	* is unique for a live viewer session.
	105	*/
	106	lttng_live_stream->stream = bt_stream_create_with_id(
	107	stream_class, lttng_live_stream->trace->trace,
	108	lttng_live_stream->viewer_stream_id);
0659c536	109	} else {
bb18709b FD	110	lttng_live_stream->stream = bt_stream_create_with_id(
	111	stream_class, lttng_live_stream->trace->trace,
	112	(uint64_t) stream_id);
0659c536	113	}
7cdc2bab	114
7cdc2bab	115	if (!lttng_live_stream->stream) {
f6e2a9d2 FD	116	BT_COMP_LOGE_APPEND_CAUSE(self_comp,
f6e2a9d2 FD	117	"Cannot create stream %s (stream class ID "
bb18709b FD	118	"%" PRId64 ", stream ID %" PRIu64 ")",
	119	lttng_live_stream->name->str,
	120	stream_class_id, stream_id);
0fb60f5d	121	goto end;
7cdc2bab	122	}
0fb60f5d	123
bb18709b FD	124	bt_stream_set_name(lttng_live_stream->stream,
bb18709b FD	125	lttng_live_stream->name->str);
7cdc2bab MD	126	}
7cdc2bab MD	127
0fb60f5d	128	end:
7cdc2bab MD	129	return lttng_live_stream->stream;
	130	}
	131
b09a5592	132	static struct bt_msg_iter_medium_ops medops = {
7cdc2bab	133	.request_bytes = medop_request_bytes,
bb18709b FD	134	.seek = NULL,
bb18709b FD	135	.borrow_stream = medop_borrow_stream,
7cdc2bab MD	136	};
	137
	138	BT_HIDDEN
bb18709b	139	enum lttng_live_iterator_status lttng_live_lazy_msg_init(
7cdc2bab MD	140	struct lttng_live_session *session)
7cdc2bab MD	141	{
bb18709b FD	142	struct lttng_live_component *lttng_live =
	143	session->lttng_live_msg_iter->lttng_live_comp;
	144	uint64_t trace_idx, stream_iter_idx;
1c0ceb65	145	bt_logging_level log_level = session->log_level;
5278d5ba	146	bt_self_component *self_comp = session->self_comp;
7cdc2bab	147
b09a5592	148	if (!session->lazy_stream_msg_init) {
bb18709b	149	return LTTNG_LIVE_ITERATOR_STATUS_OK;
7cdc2bab MD	150	}
7cdc2bab MD	151
bb18709b FD	152	for (trace_idx = 0; trace_idx < session->traces->len; trace_idx++) {
	153	struct lttng_live_trace *trace =
	154	g_ptr_array_index(session->traces, trace_idx);
	155
	156	for (stream_iter_idx = 0;
	157	stream_iter_idx < trace->stream_iterators->len;
	158	stream_iter_idx++) {
	159	struct ctf_trace_class *ctf_tc;
	160	struct lttng_live_stream_iterator *stream_iter =
	161	g_ptr_array_index(trace->stream_iterators,
0b6986b4	162	stream_iter_idx);
7cdc2bab	163
bb18709b	164	if (stream_iter->msg_iter) {
7cdc2bab MD	165	continue;
7cdc2bab MD	166	}
bb18709b	167	ctf_tc = ctf_metadata_decoder_borrow_ctf_trace_class(
0b6986b4	168	trace->metadata->decoder);
bb18709b	169	stream_iter->msg_iter = bt_msg_iter_create(ctf_tc,
0b6986b4 FD	170	lttng_live->max_query_size, medops, stream_iter,
0b6986b4 FD	171	log_level, self_comp);
bb18709b	172	if (!stream_iter->msg_iter) {
f6e2a9d2 FD	173	BT_COMP_LOGE_APPEND_CAUSE(self_comp,
f6e2a9d2 FD	174	"Failed to create CTF message iterator");
7cdc2bab MD	175	goto error;
7cdc2bab MD	176	}
58f3596b FD	177
	178	bt_msg_iter_set_emit_stream_end_message(
	179	stream_iter->msg_iter, true);
	180	bt_msg_iter_set_emit_stream_beginning_message(
	181	stream_iter->msg_iter, true);
7cdc2bab MD	182	}
	183	}
	184
b09a5592	185	session->lazy_stream_msg_init = false;
7cdc2bab	186
bb18709b	187	return LTTNG_LIVE_ITERATOR_STATUS_OK;
7cdc2bab MD	188
7cdc2bab MD	189	error:
bb18709b	190	return LTTNG_LIVE_ITERATOR_STATUS_ERROR;
7cdc2bab MD	191	}
	192
	193	BT_HIDDEN
	194	struct lttng_live_stream_iterator *lttng_live_stream_iterator_create(
	195	struct lttng_live_session *session,
	196	uint64_t ctf_trace_id,
	197	uint64_t stream_id)
	198	{
bb18709b FD	199	struct lttng_live_stream_iterator *stream_iter;
bb18709b FD	200	struct lttng_live_component *lttng_live;
7cdc2bab	201	struct lttng_live_trace *trace;
1c0ceb65	202	bt_logging_level log_level;
5278d5ba	203	bt_self_component *self_comp;
7cdc2bab	204
bb18709b FD	205	BT_ASSERT(session);
	206	BT_ASSERT(session->lttng_live_msg_iter);
	207	BT_ASSERT(session->lttng_live_msg_iter->lttng_live_comp);
1c0ceb65	208	log_level = session->log_level;
5278d5ba	209	self_comp = session->self_comp;
bb18709b FD	210
	211	lttng_live = session->lttng_live_msg_iter->lttng_live_comp;
	212
	213	stream_iter = g_new0(struct lttng_live_stream_iterator, 1);
	214	if (!stream_iter) {
f6e2a9d2 FD	215	BT_COMP_LOGE_APPEND_CAUSE(self_comp,
f6e2a9d2 FD	216	"Failed to allocate struct lttng_live_stream_iterator");
bb18709b FD	217	goto error;
	218	}
	219
1c0ceb65	220	stream_iter->log_level = log_level;
5278d5ba	221	stream_iter->self_comp = self_comp;
bb18709b	222	trace = lttng_live_borrow_trace(session, ctf_trace_id);
7cdc2bab	223	if (!trace) {
f6e2a9d2 FD	224	BT_COMP_LOGE_APPEND_CAUSE(self_comp,
f6e2a9d2 FD	225	"Failed to borrow CTF trace.");
7cdc2bab MD	226	goto error;
	227	}
	228
bb18709b FD	229	stream_iter->trace = trace;
	230	stream_iter->state = LTTNG_LIVE_STREAM_ACTIVE_NO_DATA;
	231	stream_iter->viewer_stream_id = stream_id;
	232	stream_iter->ctf_stream_class_id = -1ULL;
	233	stream_iter->last_inactivity_ts = INT64_MIN;
7cdc2bab MD	234
7cdc2bab MD	235	if (trace->trace) {
bb18709b FD	236	struct ctf_trace_class *ctf_tc =
bb18709b FD	237	ctf_metadata_decoder_borrow_ctf_trace_class(
0b6986b4	238	trace->metadata->decoder);
bb18709b FD	239	BT_ASSERT(!stream_iter->msg_iter);
bb18709b FD	240	stream_iter->msg_iter = bt_msg_iter_create(ctf_tc,
0b6986b4 FD	241	lttng_live->max_query_size, medops, stream_iter,
0b6986b4 FD	242	log_level, self_comp);
bb18709b	243	if (!stream_iter->msg_iter) {
f6e2a9d2 FD	244	BT_COMP_LOGE_APPEND_CAUSE(self_comp,
f6e2a9d2 FD	245	"Failed to create CTF message iterator");
7cdc2bab MD	246	goto error;
7cdc2bab MD	247	}
58f3596b FD	248
	249	bt_msg_iter_set_emit_stream_end_message(
	250	stream_iter->msg_iter, true);
	251	bt_msg_iter_set_emit_stream_beginning_message(
	252	stream_iter->msg_iter, true);
7cdc2bab	253	}
bb18709b FD	254	stream_iter->buf = g_new0(uint8_t, lttng_live->max_query_size);
bb18709b FD	255	if (!stream_iter->buf) {
f6e2a9d2 FD	256	BT_COMP_LOGE_APPEND_CAUSE(self_comp,
f6e2a9d2 FD	257	"Failed to allocate live stream iterator buffer");
bb18709b FD	258	goto error;
bb18709b FD	259	}
7cdc2bab	260
bb18709b FD	261	stream_iter->buflen = lttng_live->max_query_size;
	262	stream_iter->name = g_string_new(NULL);
	263	if (!stream_iter->name) {
f6e2a9d2 FD	264	BT_COMP_LOGE_APPEND_CAUSE(self_comp,
f6e2a9d2 FD	265	"Failed to allocate live stream iterator name buffer");
bb18709b FD	266	goto error;
	267	}
	268
	269	g_string_printf(stream_iter->name, STREAM_NAME_PREFIX "%" PRIu64,
0b6986b4	270	stream_iter->viewer_stream_id);
bb18709b	271	g_ptr_array_add(trace->stream_iterators, stream_iter);
7cdc2bab	272
bb18709b FD	273	/* Track the number of active stream iterator. */
bb18709b FD	274	session->lttng_live_msg_iter->active_stream_iter++;
7cdc2bab MD	275
	276	goto end;
	277	error:
bb18709b FD	278	lttng_live_stream_iterator_destroy(stream_iter);
bb18709b FD	279	stream_iter = NULL;
7cdc2bab	280	end:
bb18709b	281	return stream_iter;
7cdc2bab MD	282	}
	283
	284	BT_HIDDEN
bb18709b FD	285	void lttng_live_stream_iterator_destroy(
bb18709b FD	286	struct lttng_live_stream_iterator *stream_iter)
7cdc2bab	287	{
bb18709b	288	if (!stream_iter) {
7cdc2bab MD	289	return;
	290	}
	291
bb18709b FD	292	if (stream_iter->stream) {
bb18709b FD	293	BT_STREAM_PUT_REF_AND_RESET(stream_iter->stream);
7cdc2bab MD	294	}
7cdc2bab MD	295
bb18709b FD	296	if (stream_iter->msg_iter) {
bb18709b FD	297	bt_msg_iter_destroy(stream_iter->msg_iter);
7cdc2bab	298	}
be1b2e7e	299	g_free(stream_iter->buf);
bb18709b FD	300	if (stream_iter->name) {
	301	g_string_free(stream_iter->name, TRUE);
	302	}
	303
	304	bt_message_put_ref(stream_iter->current_msg);
	305
	306	/* Track the number of active stream iterator. */
	307	stream_iter->trace->session->lttng_live_msg_iter->active_stream_iter--;
	308
7cdc2bab MD	309	/*
	310	* Ensure we poke the trace metadata in the future, which is
	311	* required to release the metadata reference on the trace.
	312	*/
bb18709b FD	313	stream_iter->trace->new_metadata_needed = true;
bb18709b FD	314	g_free(stream_iter);
7cdc2bab	315	}