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

/*
 * SPDX-License-Identifier: MIT
 *
 * 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
 */

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

#define STREAM_NAME_PREFIX	"stream-"

static
enum ctf_msg_iter_medium_status medop_request_bytes(
		size_t request_sz, uint8_t **buffer_addr,
		size_t *buffer_sz, void *data)
{
	enum ctf_msg_iter_medium_status status =
		CTF_MSG_ITER_MEDIUM_STATUS_OK;
	lttng_live_stream_iterator *stream = (lttng_live_stream_iterator *) 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;

	BT_ASSERT(request_sz);

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

	len_left = stream->base_offset + stream->len - stream->offset;
	if (!len_left) {
		lttng_live_stream_iterator_set_state(stream,
				LTTNG_LIVE_STREAM_ACTIVE_NO_DATA);
		status = CTF_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)
{
	lttng_live_stream_iterator *lttng_live_stream = (lttng_live_stream_iterator *) 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 ctf_msg_iter_medium_ops medops = {
	medop_request_bytes,
	nullptr,
	nullptr,
	medop_borrow_stream,
};

BT_HIDDEN
enum lttng_live_iterator_status lttng_live_lazy_msg_init(
		struct lttng_live_session *session,
		bt_self_message_iterator *self_msg_iter)
{
	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;
	}

	BT_COMP_LOGD("Lazily initializing self message iterator for live session: "
		"session-id=%" PRIu64 ", self-msg-iter-addr=%p", session->id,
		self_msg_iter);

	for (trace_idx = 0; trace_idx < session->traces->len; trace_idx++) {
		struct lttng_live_trace *trace =
			(lttng_live_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 =
				(lttng_live_stream_iterator *) 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);
			BT_COMP_LOGD("Creating CTF message iterator: "
				"session-id=%" PRIu64 ", ctf-tc-addr=%p, "
				"stream-iter-name=%s, self-msg-iter-addr=%p",
				session->id, ctf_tc, stream_iter->name->str, self_msg_iter);
			stream_iter->msg_iter = ctf_msg_iter_create(ctf_tc,
				lttng_live->max_query_size, medops, stream_iter,
				log_level, self_comp, self_msg_iter);
			if (!stream_iter->msg_iter) {
				BT_COMP_LOGE_APPEND_CAUSE(self_comp,
					"Failed to create CTF message iterator");
				goto error;
			}
		}
	}

	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,
		bt_self_message_iterator *self_msg_iter)
{
	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_session_borrow_or_create_trace_by_id(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.is_set = false;
	stream_iter->ctf_stream_class_id.value = UINT64_MAX;

	stream_iter->last_inactivity_ts.is_set = false;
	stream_iter->last_inactivity_ts.value = 0;

	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 = ctf_msg_iter_create(ctf_tc,
			lttng_live->max_query_size, medops, stream_iter,
			log_level, self_comp, self_msg_iter);
		if (!stream_iter->msg_iter) {
			BT_COMP_LOGE_APPEND_CAUSE(self_comp,
				"Failed to create CTF message iterator");
			goto error;
		}
	}
	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) {
		ctf_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--;

	g_free(stream_iter);
}
Commit	Line	Data
7cdc2bab	1	/*
0235b0db	2	* SPDX-License-Identifier: MIT
7cdc2bab	3	*
0235b0db MJ	4	* Copyright 2019 Francis Deslauriers <francis.deslauriers@efficios.com>
	5	* Copyright 2016 Philippe Proulx <pproulx@efficios.com>
	6	* Copyright 2016 Jérémie Galarneau <jeremie.galarneau@efficios.com>
	7	* Copyright 2010-2011 EfficiOS Inc. and Linux Foundation
7cdc2bab MD	8	*/
7cdc2bab MD	9
2ece7dd0	10	#define BT_COMP_LOG_SELF_COMP self_comp
c01594de	11	#define BT_LOG_OUTPUT_LEVEL log_level
350ad6c1	12	#define BT_LOG_TAG "PLUGIN/SRC.CTF.LTTNG-LIVE/DS"
d9c39b0a	13	#include "logging/comp-logging.h"
020bc26f	14
3c22a242	15	#include <inttypes.h>
7cdc2bab	16	#include <stdio.h>
7cdc2bab	17	#include <stdlib.h>
3c22a242	18
7cdc2bab	19	#include <glib.h>
3c22a242	20
3fadfbc0	21	#include <babeltrace2/babeltrace.h>
3c22a242	22
087cd0f5	23	#include "../common/msg-iter/msg-iter.hpp"
578e048b	24	#include "common/assert.h"
3c22a242	25	#include "compat/mman.h"
087cd0f5	26	#include "data-stream.hpp"
7cdc2bab	27
14f28187 FD	28	#define STREAM_NAME_PREFIX "stream-"
14f28187 FD	29
7cdc2bab	30	static
18a1979b	31	enum ctf_msg_iter_medium_status medop_request_bytes(
7cdc2bab MD	32	size_t request_sz, uint8_t **buffer_addr,
	33	size_t buffer_sz, void data)
	34	{
18a1979b SM	35	enum ctf_msg_iter_medium_status status =
18a1979b SM	36	CTF_MSG_ITER_MEDIUM_STATUS_OK;
087cd0f5	37	lttng_live_stream_iterator stream = (lttng_live_stream_iterator ) data;
7cdc2bab MD	38	struct lttng_live_trace *trace = stream->trace;
7cdc2bab MD	39	struct lttng_live_session *session = trace->session;
14f28187	40	struct lttng_live_msg_iter *live_msg_iter = session->lttng_live_msg_iter;
7cdc2bab MD	41	uint64_t recv_len = 0;
	42	uint64_t len_left;
	43	uint64_t read_len;
7cdc2bab	44
c9694de4 SM	45	BT_ASSERT(request_sz);
c9694de4 SM	46
4a39caef	47	if (stream->has_stream_hung_up) {
18a1979b	48	status = CTF_MSG_ITER_MEDIUM_STATUS_EOF;
4a39caef FD	49	goto end;
	50	}
	51
7cdc2bab MD	52	len_left = stream->base_offset + stream->len - stream->offset;
7cdc2bab MD	53	if (!len_left) {
34533ae0 FD	54	lttng_live_stream_iterator_set_state(stream,
34533ae0 FD	55	LTTNG_LIVE_STREAM_ACTIVE_NO_DATA);
18a1979b	56	status = CTF_MSG_ITER_MEDIUM_STATUS_AGAIN;
4a39caef	57	goto end;
7cdc2bab	58	}
4a39caef	59
7cdc2bab MD	60	read_len = MIN(request_sz, stream->buflen);
7cdc2bab MD	61	read_len = MIN(read_len, len_left);
14f28187	62	status = lttng_live_get_stream_bytes(live_msg_iter,
7cdc2bab MD	63	stream, stream->buf, stream->offset,
7cdc2bab MD	64	read_len, &recv_len);
7cdc2bab MD	65	*buffer_addr = stream->buf;
	66	*buffer_sz = recv_len;
	67	stream->offset += recv_len;
4a39caef	68	end:
7cdc2bab MD	69	return status;
	70	}
	71
	72	static
14f28187 FD	73	bt_stream medop_borrow_stream(bt_stream_class stream_class,
14f28187 FD	74	int64_t stream_id, void *data)
7cdc2bab	75	{
087cd0f5	76	lttng_live_stream_iterator lttng_live_stream = (lttng_live_stream_iterator ) data;
c01594de	77	bt_logging_level log_level = lttng_live_stream->log_level;
2ece7dd0	78	bt_self_component *self_comp = lttng_live_stream->self_comp;
7cdc2bab MD	79
7cdc2bab MD	80	if (!lttng_live_stream->stream) {
14f28187	81	uint64_t stream_class_id = bt_stream_class_get_id(stream_class);
b92735af	82
2ece7dd0	83	BT_COMP_LOGI("Creating stream %s (ID: %" PRIu64 ") out of stream "
14f28187 FD	84	"class %" PRId64, lttng_live_stream->name->str,
14f28187 FD	85	stream_id, stream_class_id);
b92735af	86
14f28187 FD	87	if (stream_id < 0) {
	88	/*
	89	* No stream instance ID in the stream. It's possible
	90	* to encounter this situation with older version of
	91	* LTTng. In these cases, use the viewer_stream_id that
	92	* is unique for a live viewer session.
	93	*/
	94	lttng_live_stream->stream = bt_stream_create_with_id(
	95	stream_class, lttng_live_stream->trace->trace,
	96	lttng_live_stream->viewer_stream_id);
b92735af	97	} else {
14f28187 FD	98	lttng_live_stream->stream = bt_stream_create_with_id(
	99	stream_class, lttng_live_stream->trace->trace,
	100	(uint64_t) stream_id);
b92735af	101	}
7cdc2bab	102
7cdc2bab	103	if (!lttng_live_stream->stream) {
1419db2b FD	104	BT_COMP_LOGE_APPEND_CAUSE(self_comp,
1419db2b FD	105	"Cannot create stream %s (stream class ID "
14f28187 FD	106	"%" PRId64 ", stream ID %" PRIu64 ")",
	107	lttng_live_stream->name->str,
	108	stream_class_id, stream_id);
b80991f6	109	goto end;
7cdc2bab	110	}
b80991f6	111
14f28187 FD	112	bt_stream_set_name(lttng_live_stream->stream,
14f28187 FD	113	lttng_live_stream->name->str);
7cdc2bab MD	114	}
7cdc2bab MD	115
b80991f6	116	end:
7cdc2bab MD	117	return lttng_live_stream->stream;
	118	}
	119
18a1979b	120	static struct ctf_msg_iter_medium_ops medops = {
087cd0f5 SM	121	medop_request_bytes,
	122	nullptr,
	123	nullptr,
	124	medop_borrow_stream,
7cdc2bab MD	125	};
	126
	127	BT_HIDDEN
14f28187	128	enum lttng_live_iterator_status lttng_live_lazy_msg_init(
851de941 SM	129	struct lttng_live_session *session,
851de941 SM	130	bt_self_message_iterator *self_msg_iter)
7cdc2bab	131	{
14f28187 FD	132	struct lttng_live_component *lttng_live =
	133	session->lttng_live_msg_iter->lttng_live_comp;
	134	uint64_t trace_idx, stream_iter_idx;
c01594de	135	bt_logging_level log_level = session->log_level;
2ece7dd0	136	bt_self_component *self_comp = session->self_comp;
7cdc2bab	137
d6e69534	138	if (!session->lazy_stream_msg_init) {
14f28187	139	return LTTNG_LIVE_ITERATOR_STATUS_OK;
7cdc2bab MD	140	}
7cdc2bab MD	141
ecb4ba8a	142	BT_COMP_LOGD("Lazily initializing self message iterator for live session: "
087cd0f5	143	"session-id=%" PRIu64 ", self-msg-iter-addr=%p", session->id,
ecb4ba8a FD	144	self_msg_iter);
ecb4ba8a FD	145
14f28187 FD	146	for (trace_idx = 0; trace_idx < session->traces->len; trace_idx++) {
14f28187 FD	147	struct lttng_live_trace *trace =
087cd0f5	148	(lttng_live_trace *) g_ptr_array_index(session->traces, trace_idx);
14f28187 FD	149
	150	for (stream_iter_idx = 0;
	151	stream_iter_idx < trace->stream_iterators->len;
	152	stream_iter_idx++) {
	153	struct ctf_trace_class *ctf_tc;
	154	struct lttng_live_stream_iterator *stream_iter =
087cd0f5	155	(lttng_live_stream_iterator *) g_ptr_array_index(trace->stream_iterators,
0f1979c3	156	stream_iter_idx);
7cdc2bab	157
14f28187	158	if (stream_iter->msg_iter) {
7cdc2bab MD	159	continue;
7cdc2bab MD	160	}
14f28187	161	ctf_tc = ctf_metadata_decoder_borrow_ctf_trace_class(
0f1979c3	162	trace->metadata->decoder);
ecb4ba8a	163	BT_COMP_LOGD("Creating CTF message iterator: "
087cd0f5	164	"session-id=%" PRIu64 ", ctf-tc-addr=%p, "
ecb4ba8a FD	165	"stream-iter-name=%s, self-msg-iter-addr=%p",
ecb4ba8a FD	166	session->id, ctf_tc, stream_iter->name->str, self_msg_iter);
18a1979b	167	stream_iter->msg_iter = ctf_msg_iter_create(ctf_tc,
0f1979c3	168	lttng_live->max_query_size, medops, stream_iter,
851de941	169	log_level, self_comp, self_msg_iter);
14f28187	170	if (!stream_iter->msg_iter) {
1419db2b FD	171	BT_COMP_LOGE_APPEND_CAUSE(self_comp,
1419db2b FD	172	"Failed to create CTF message iterator");
7cdc2bab MD	173	goto error;
	174	}
	175	}
	176	}
	177
d6e69534	178	session->lazy_stream_msg_init = false;
7cdc2bab	179
14f28187	180	return LTTNG_LIVE_ITERATOR_STATUS_OK;
7cdc2bab MD	181
7cdc2bab MD	182	error:
14f28187	183	return LTTNG_LIVE_ITERATOR_STATUS_ERROR;
7cdc2bab MD	184	}
	185
	186	BT_HIDDEN
	187	struct lttng_live_stream_iterator *lttng_live_stream_iterator_create(
	188	struct lttng_live_session *session,
	189	uint64_t ctf_trace_id,
851de941 SM	190	uint64_t stream_id,
851de941 SM	191	bt_self_message_iterator *self_msg_iter)
7cdc2bab	192	{
14f28187 FD	193	struct lttng_live_stream_iterator *stream_iter;
14f28187 FD	194	struct lttng_live_component *lttng_live;
7cdc2bab	195	struct lttng_live_trace *trace;
c01594de	196	bt_logging_level log_level;
2ece7dd0	197	bt_self_component *self_comp;
7cdc2bab	198
14f28187 FD	199	BT_ASSERT(session);
	200	BT_ASSERT(session->lttng_live_msg_iter);
	201	BT_ASSERT(session->lttng_live_msg_iter->lttng_live_comp);
c01594de	202	log_level = session->log_level;
2ece7dd0	203	self_comp = session->self_comp;
14f28187 FD	204
	205	lttng_live = session->lttng_live_msg_iter->lttng_live_comp;
	206
	207	stream_iter = g_new0(struct lttng_live_stream_iterator, 1);
	208	if (!stream_iter) {
1419db2b FD	209	BT_COMP_LOGE_APPEND_CAUSE(self_comp,
1419db2b FD	210	"Failed to allocate struct lttng_live_stream_iterator");
14f28187 FD	211	goto error;
	212	}
	213
c01594de	214	stream_iter->log_level = log_level;
2ece7dd0	215	stream_iter->self_comp = self_comp;
36e94ad6	216	trace = lttng_live_session_borrow_or_create_trace_by_id(session, ctf_trace_id);
7cdc2bab	217	if (!trace) {
1419db2b FD	218	BT_COMP_LOGE_APPEND_CAUSE(self_comp,
1419db2b FD	219	"Failed to borrow CTF trace.");
7cdc2bab MD	220	goto error;
	221	}
	222
14f28187 FD	223	stream_iter->trace = trace;
	224	stream_iter->state = LTTNG_LIVE_STREAM_ACTIVE_NO_DATA;
	225	stream_iter->viewer_stream_id = stream_id;
1a258819 FD	226
	227	stream_iter->ctf_stream_class_id.is_set = false;
	228	stream_iter->ctf_stream_class_id.value = UINT64_MAX;
	229
a043c362 FD	230	stream_iter->last_inactivity_ts.is_set = false;
a043c362 FD	231	stream_iter->last_inactivity_ts.value = 0;
7cdc2bab MD	232
7cdc2bab MD	233	if (trace->trace) {
14f28187 FD	234	struct ctf_trace_class *ctf_tc =
14f28187 FD	235	ctf_metadata_decoder_borrow_ctf_trace_class(
0f1979c3	236	trace->metadata->decoder);
14f28187	237	BT_ASSERT(!stream_iter->msg_iter);
18a1979b	238	stream_iter->msg_iter = ctf_msg_iter_create(ctf_tc,
0f1979c3	239	lttng_live->max_query_size, medops, stream_iter,
851de941	240	log_level, self_comp, self_msg_iter);
14f28187	241	if (!stream_iter->msg_iter) {
1419db2b FD	242	BT_COMP_LOGE_APPEND_CAUSE(self_comp,
1419db2b FD	243	"Failed to create CTF message iterator");
7cdc2bab MD	244	goto error;
	245	}
	246	}
14f28187 FD	247	stream_iter->buf = g_new0(uint8_t, lttng_live->max_query_size);
14f28187 FD	248	if (!stream_iter->buf) {
1419db2b FD	249	BT_COMP_LOGE_APPEND_CAUSE(self_comp,
1419db2b FD	250	"Failed to allocate live stream iterator buffer");
14f28187 FD	251	goto error;
14f28187 FD	252	}
7cdc2bab	253
14f28187 FD	254	stream_iter->buflen = lttng_live->max_query_size;
	255	stream_iter->name = g_string_new(NULL);
	256	if (!stream_iter->name) {
1419db2b FD	257	BT_COMP_LOGE_APPEND_CAUSE(self_comp,
1419db2b FD	258	"Failed to allocate live stream iterator name buffer");
14f28187 FD	259	goto error;
	260	}
	261
	262	g_string_printf(stream_iter->name, STREAM_NAME_PREFIX "%" PRIu64,
0f1979c3	263	stream_iter->viewer_stream_id);
14f28187	264	g_ptr_array_add(trace->stream_iterators, stream_iter);
7cdc2bab	265
14f28187 FD	266	/* Track the number of active stream iterator. */
14f28187 FD	267	session->lttng_live_msg_iter->active_stream_iter++;
7cdc2bab MD	268
	269	goto end;
	270	error:
14f28187 FD	271	lttng_live_stream_iterator_destroy(stream_iter);
14f28187 FD	272	stream_iter = NULL;
7cdc2bab	273	end:
14f28187	274	return stream_iter;
7cdc2bab MD	275	}
	276
	277	BT_HIDDEN
14f28187 FD	278	void lttng_live_stream_iterator_destroy(
14f28187 FD	279	struct lttng_live_stream_iterator *stream_iter)
7cdc2bab	280	{
14f28187	281	if (!stream_iter) {
7cdc2bab MD	282	return;
	283	}
	284
14f28187 FD	285	if (stream_iter->stream) {
14f28187 FD	286	BT_STREAM_PUT_REF_AND_RESET(stream_iter->stream);
7cdc2bab MD	287	}
7cdc2bab MD	288
14f28187	289	if (stream_iter->msg_iter) {
18a1979b	290	ctf_msg_iter_destroy(stream_iter->msg_iter);
7cdc2bab	291	}
19bbdc9b	292	g_free(stream_iter->buf);
14f28187 FD	293	if (stream_iter->name) {
	294	g_string_free(stream_iter->name, TRUE);
	295	}
	296
	297	bt_message_put_ref(stream_iter->current_msg);
	298
	299	/* Track the number of active stream iterator. */
	300	stream_iter->trace->session->lttng_live_msg_iter->active_stream_iter--;
	301
14f28187	302	g_free(stream_iter);
7cdc2bab	303	}