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

/*
 * Copyright 2019 - Francis Deslauriers <francis.deslauriers@efficios.com>
 * Copyright 2016 - Philippe Proulx <pproulx@efficios.com>
 * Copyright 2010-2011 - EfficiOS Inc. and Linux Foundation
 *
 * Some functions are based on older functions written by Mathieu Desnoyers.
 *
 * 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/META"
#include "plugins/comp-logging.h"

#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <stdbool.h>
#include <glib.h>
#include "compat/memstream.h"
#include <babeltrace2/babeltrace.h>

#include "metadata.h"
#include "../common/metadata/decoder.h"
#include "../common/metadata/ctf-meta-configure-ir-trace.h"

#define TSDL_MAGIC	0x75d11d57

struct packet_header {
	uint32_t magic;
	uint8_t  uuid[16];
	uint32_t checksum;
	uint32_t content_size;
	uint32_t packet_size;
	uint8_t  compression_scheme;
	uint8_t  encryption_scheme;
	uint8_t  checksum_scheme;
	uint8_t  major;
	uint8_t  minor;
} __attribute__((__packed__));


static
bool stream_classes_all_have_default_clock_class(bt_trace_class *tc,
		bt_logging_level log_level,
		bt_self_component *self_comp)
{
	uint64_t i, sc_count;
	const bt_clock_class *cc = NULL;
	const bt_stream_class *sc;
	bool ret = true;

	sc_count = bt_trace_class_get_stream_class_count(tc);
	for (i = 0; i < sc_count; i++) {
		sc = bt_trace_class_borrow_stream_class_by_index_const(tc, i);

		BT_ASSERT(sc);

		cc = bt_stream_class_borrow_default_clock_class_const(sc);
		if (!cc) {
			ret = false;
			BT_COMP_LOGE("Stream class doesn't have a default clock class: "
				"sc-id=%" PRIu64 ", sc-name=\"%s\"",
				bt_stream_class_get_id(sc),
				bt_stream_class_get_name(sc));
			goto end;
		}
	}

end:
	return ret;
}
/*
 * Iterate over the stream classes and returns the first clock class
 * encountered. This is useful to create message iterator inactivity message as
 * we don't need a particular clock class.
 */
static
const bt_clock_class *borrow_any_clock_class(bt_trace_class *tc)
{
	uint64_t i, sc_count;
	const bt_clock_class *cc = NULL;
	const bt_stream_class *sc;

	sc_count = bt_trace_class_get_stream_class_count(tc);
	for (i = 0; i < sc_count; i++) {
		sc = bt_trace_class_borrow_stream_class_by_index_const(tc, i);
		BT_ASSERT(sc);

		cc = bt_stream_class_borrow_default_clock_class_const(sc);
		if (cc) {
			goto end;
		}
	}
end:
	BT_ASSERT(cc);
	return cc;
}

BT_HIDDEN
enum lttng_live_iterator_status lttng_live_metadata_update(
		struct lttng_live_trace *trace)
{
	struct lttng_live_session *session = trace->session;
	struct lttng_live_metadata *metadata = trace->metadata;
	struct lttng_live_component *lttng_live =
		session->lttng_live_msg_iter->lttng_live_comp;
	ssize_t ret = 0;
	size_t size, len_read = 0;
	char *metadata_buf = NULL;
	FILE *fp = NULL;
	enum ctf_metadata_decoder_status decoder_status;
	enum lttng_live_iterator_status status =
		LTTNG_LIVE_ITERATOR_STATUS_OK;
	bt_logging_level log_level = trace->log_level;
	bt_self_component *self_comp = trace->self_comp;

	/* No metadata stream yet. */
	if (!metadata) {
		if (session->new_streams_needed) {
			status = LTTNG_LIVE_ITERATOR_STATUS_AGAIN;
		} else {
			session->new_streams_needed = true;
			status = LTTNG_LIVE_ITERATOR_STATUS_CONTINUE;
		}
		goto end;
	}

	if (!metadata->trace) {
		trace->new_metadata_needed = false;
	}

	if (!trace->new_metadata_needed) {
		goto end;
	}

	/* Open for writing */
	fp = bt_open_memstream(&metadata_buf, &size);
	if (!fp) {
		BT_COMP_LOGE("Metadata open_memstream: %s", strerror(errno));
		goto error;
	}

	/* Grab all available metadata. */
	do {
		/*
		 * get_one_metadata_packet returns the number of bytes
		 * received, 0 when we have received everything, a
		 * negative value on error.
		 */
		ret = lttng_live_get_one_metadata_packet(trace, fp);
		if (ret > 0) {
			len_read += ret;
		}
	} while (ret > 0);

	/*
	 * Consider metadata closed as soon as we get an error reading
	 * it (e.g. cannot be found).
	 */
	if (ret < 0) {
		if (!metadata->closed) {
			metadata->closed = true;
			/*
			 * Release our reference on the trace as soon as
			 * we know the metadata stream is not available
			 * anymore. This won't necessarily teardown the
			 * metadata objects immediately, but only when
			 * the data streams are done.
			 */
			metadata->trace = NULL;
		}
		if (errno == EINTR) {
			if (lttng_live_graph_is_canceled(lttng_live)) {
				status = LTTNG_LIVE_ITERATOR_STATUS_AGAIN;
				goto end;
			}
		}
	}

	if (bt_close_memstream(&metadata_buf, &size, fp)) {
		BT_COMP_LOGE("bt_close_memstream: %s", strerror(errno));
	}
	ret = 0;
	fp = NULL;

	if (len_read == 0) {
		if (!trace->trace) {
			status = LTTNG_LIVE_ITERATOR_STATUS_AGAIN;
			goto end;
		}
		trace->new_metadata_needed = false;
		goto end;
	}

	fp = bt_fmemopen(metadata_buf, len_read, "rb");
	if (!fp) {
		BT_COMP_LOGE("Cannot memory-open metadata buffer: %s",
			strerror(errno));
		goto error;
	}

	/*
	 * The call to ctf_metadata_decoder_decode will append new metadata to
	 * our current trace class.
	 */
	decoder_status = ctf_metadata_decoder_decode(metadata->decoder, fp);
	switch (decoder_status) {
	case CTF_METADATA_DECODER_STATUS_OK:
		if (!trace->trace_class) {
			struct ctf_trace_class *tc =
				ctf_metadata_decoder_borrow_ctf_trace_class(
					metadata->decoder);

			trace->trace_class =
				ctf_metadata_decoder_get_ir_trace_class(
						metadata->decoder);
			trace->trace = bt_trace_create(trace->trace_class);
			if (!trace->trace) {
				goto error;
			}
			if (ctf_trace_class_configure_ir_trace(tc,
					trace->trace)) {
				goto error;
			}
			if (!stream_classes_all_have_default_clock_class(
					trace->trace_class, log_level,
					self_comp)) {
				/* Error logged in function. */
				goto error;
			}
			trace->clock_class =
				borrow_any_clock_class(trace->trace_class);
		}
		trace->new_metadata_needed = false;

		break;
	case CTF_METADATA_DECODER_STATUS_INCOMPLETE:
		status = LTTNG_LIVE_ITERATOR_STATUS_AGAIN;
		break;
	case CTF_METADATA_DECODER_STATUS_ERROR:
	case CTF_METADATA_DECODER_STATUS_INVAL_VERSION:
	case CTF_METADATA_DECODER_STATUS_IR_VISITOR_ERROR:
		goto error;
	}

	goto end;
error:
	status = LTTNG_LIVE_ITERATOR_STATUS_ERROR;
end:
	if (fp) {
		int closeret;

		closeret = fclose(fp);
		if (closeret) {
			BT_COMP_LOGE("Error on fclose");
		}
	}
	free(metadata_buf);
	return status;
}

BT_HIDDEN
int lttng_live_metadata_create_stream(struct lttng_live_session *session,
		uint64_t ctf_trace_id, uint64_t stream_id,
		const char *trace_name)
{
	struct lttng_live_metadata *metadata = NULL;
	struct lttng_live_trace *trace;
	const char *match;
	struct ctf_metadata_decoder_config cfg = {
		.log_level = session->log_level,
		.self_comp = session->self_comp,
		.clock_class_offset_s = 0,
		.clock_class_offset_ns = 0,
	};

	metadata = g_new0(struct lttng_live_metadata, 1);
	if (!metadata) {
		return -1;
	}
	metadata->log_level = session->log_level;
	metadata->self_comp = session->self_comp;
	metadata->stream_id = stream_id;

	match = strstr(trace_name, session->session_name->str);
	if (!match) {
		goto error;
	}

	metadata->decoder = ctf_metadata_decoder_create(&cfg);
	if (!metadata->decoder) {
		goto error;
	}
	trace = lttng_live_borrow_trace(session, ctf_trace_id);
	if (!trace) {
		goto error;
	}
	metadata->trace = trace;
	trace->metadata = metadata;
	return 0;

error:
	ctf_metadata_decoder_destroy(metadata->decoder);
	g_free(metadata);
	return -1;
}

BT_HIDDEN
void lttng_live_metadata_fini(struct lttng_live_trace *trace)
{
	struct lttng_live_metadata *metadata = trace->metadata;

	if (!metadata) {
		return;
	}
	ctf_metadata_decoder_destroy(metadata->decoder);
	trace->metadata = NULL;
	g_free(metadata);
}
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 2010-2011 - EfficiOS Inc. and Linux Foundation
	5	*
	6	* Some functions are based on older functions written by Mathieu Desnoyers.
	7	*
	8	* Permission is hereby granted, free of charge, to any person obtaining a copy
	9	* of this software and associated documentation files (the "Software"), to deal
	10	* in the Software without restriction, including without limitation the rights
	11	* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
	12	* copies of the Software, and to permit persons to whom the Software is
	13	* furnished to do so, subject to the following conditions:
	14	*
	15	* The above copyright notice and this permission notice shall be included in
	16	* all copies or substantial portions of the Software.
	17	*
	18	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	19	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	20	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
	21	* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	22	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
	23	* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
	24	* SOFTWARE.
	25	*/
	26
2ece7dd0	27	#define BT_COMP_LOG_SELF_COMP self_comp
c01594de	28	#define BT_LOG_OUTPUT_LEVEL log_level
350ad6c1	29	#define BT_LOG_TAG "PLUGIN/SRC.CTF.LTTNG-LIVE/META"
2ece7dd0	30	#include "plugins/comp-logging.h"
020bc26f	31
7cdc2bab MD	32	#include <stdio.h>
	33	#include <stdint.h>
	34	#include <stdlib.h>
	35	#include <stdbool.h>
	36	#include <glib.h>
578e048b	37	#include "compat/memstream.h"
3fadfbc0	38	#include <babeltrace2/babeltrace.h>
7cdc2bab	39
7cdc2bab MD	40	#include "metadata.h"
7cdc2bab MD	41	#include "../common/metadata/decoder.h"
335a2da5	42	#include "../common/metadata/ctf-meta-configure-ir-trace.h"
7cdc2bab MD	43
	44	#define TSDL_MAGIC 0x75d11d57
	45
	46	struct packet_header {
	47	uint32_t magic;
	48	uint8_t uuid[16];
	49	uint32_t checksum;
	50	uint32_t content_size;
	51	uint32_t packet_size;
	52	uint8_t compression_scheme;
	53	uint8_t encryption_scheme;
	54	uint8_t checksum_scheme;
	55	uint8_t major;
	56	uint8_t minor;
	57	} __attribute__((__packed__));
	58
14f28187	59
7cdc2bab	60	static
c01594de	61	bool stream_classes_all_have_default_clock_class(bt_trace_class *tc,
2ece7dd0 PP	62	bt_logging_level log_level,
2ece7dd0 PP	63	bt_self_component *self_comp)
7cdc2bab	64	{
14f28187 FD	65	uint64_t i, sc_count;
	66	const bt_clock_class *cc = NULL;
	67	const bt_stream_class *sc;
	68	bool ret = true;
7cdc2bab	69
14f28187 FD	70	sc_count = bt_trace_class_get_stream_class_count(tc);
	71	for (i = 0; i < sc_count; i++) {
	72	sc = bt_trace_class_borrow_stream_class_by_index_const(tc, i);
7cdc2bab	73
14f28187	74	BT_ASSERT(sc);
7cdc2bab	75
14f28187 FD	76	cc = bt_stream_class_borrow_default_clock_class_const(sc);
	77	if (!cc) {
	78	ret = false;
2ece7dd0	79	BT_COMP_LOGE("Stream class doesn't have a default clock class: "
14f28187 FD	80	"sc-id=%" PRIu64 ", sc-name=\"%s\"",
	81	bt_stream_class_get_id(sc),
	82	bt_stream_class_get_name(sc));
	83	goto end;
7cdc2bab MD	84	}
	85	}
	86
7cdc2bab	87	end:
14f28187 FD	88	return ret;
	89	}
	90	/*
	91	* Iterate over the stream classes and returns the first clock class
	92	* encountered. This is useful to create message iterator inactivity message as
	93	* we don't need a particular clock class.
	94	*/
	95	static
	96	const bt_clock_class borrow_any_clock_class(bt_trace_class tc)
	97	{
	98	uint64_t i, sc_count;
	99	const bt_clock_class *cc = NULL;
	100	const bt_stream_class *sc;
	101
	102	sc_count = bt_trace_class_get_stream_class_count(tc);
	103	for (i = 0; i < sc_count; i++) {
	104	sc = bt_trace_class_borrow_stream_class_by_index_const(tc, i);
	105	BT_ASSERT(sc);
	106
	107	cc = bt_stream_class_borrow_default_clock_class_const(sc);
	108	if (cc) {
	109	goto end;
	110	}
	111	}
	112	end:
	113	BT_ASSERT(cc);
	114	return cc;
7cdc2bab MD	115	}
	116
	117	BT_HIDDEN
14f28187	118	enum lttng_live_iterator_status lttng_live_metadata_update(
7cdc2bab MD	119	struct lttng_live_trace *trace)
	120	{
	121	struct lttng_live_session *session = trace->session;
7cdc2bab	122	struct lttng_live_metadata *metadata = trace->metadata;
14f28187 FD	123	struct lttng_live_component *lttng_live =
14f28187 FD	124	session->lttng_live_msg_iter->lttng_live_comp;
7cdc2bab MD	125	ssize_t ret = 0;
	126	size_t size, len_read = 0;
	127	char *metadata_buf = NULL;
	128	FILE *fp = NULL;
	129	enum ctf_metadata_decoder_status decoder_status;
14f28187 FD	130	enum lttng_live_iterator_status status =
14f28187 FD	131	LTTNG_LIVE_ITERATOR_STATUS_OK;
c01594de	132	bt_logging_level log_level = trace->log_level;
2ece7dd0	133	bt_self_component *self_comp = trace->self_comp;
7cdc2bab MD	134
	135	/* No metadata stream yet. */
	136	if (!metadata) {
	137	if (session->new_streams_needed) {
14f28187	138	status = LTTNG_LIVE_ITERATOR_STATUS_AGAIN;
7cdc2bab MD	139	} else {
7cdc2bab MD	140	session->new_streams_needed = true;
14f28187	141	status = LTTNG_LIVE_ITERATOR_STATUS_CONTINUE;
7cdc2bab MD	142	}
	143	goto end;
	144	}
	145
6f79a7cf MD	146	if (!metadata->trace) {
	147	trace->new_metadata_needed = false;
	148	}
	149
7cdc2bab MD	150	if (!trace->new_metadata_needed) {
	151	goto end;
	152	}
	153
	154	/* Open for writing */
	155	fp = bt_open_memstream(&metadata_buf, &size);
	156	if (!fp) {
2ece7dd0	157	BT_COMP_LOGE("Metadata open_memstream: %s", strerror(errno));
7cdc2bab MD	158	goto error;
	159	}
	160
	161	/* Grab all available metadata. */
	162	do {
	163	/*
	164	* get_one_metadata_packet returns the number of bytes
	165	* received, 0 when we have received everything, a
	166	* negative value on error.
	167	*/
	168	ret = lttng_live_get_one_metadata_packet(trace, fp);
	169	if (ret > 0) {
	170	len_read += ret;
	171	}
	172	} while (ret > 0);
	173
	174	/*
	175	* Consider metadata closed as soon as we get an error reading
	176	* it (e.g. cannot be found).
	177	*/
	178	if (ret < 0) {
	179	if (!metadata->closed) {
	180	metadata->closed = true;
	181	/*
	182	* Release our reference on the trace as soon as
	183	* we know the metadata stream is not available
	184	* anymore. This won't necessarily teardown the
	185	* metadata objects immediately, but only when
	186	* the data streams are done.
	187	*/
6f79a7cf	188	metadata->trace = NULL;
7cdc2bab	189	}
4c66436f	190	if (errno == EINTR) {
42521b69	191	if (lttng_live_graph_is_canceled(lttng_live)) {
14f28187	192	status = LTTNG_LIVE_ITERATOR_STATUS_AGAIN;
4c66436f MD	193	goto end;
	194	}
	195	}
7cdc2bab MD	196	}
	197
	198	if (bt_close_memstream(&metadata_buf, &size, fp)) {
2ece7dd0	199	BT_COMP_LOGE("bt_close_memstream: %s", strerror(errno));
7cdc2bab MD	200	}
	201	ret = 0;
	202	fp = NULL;
	203
	204	if (len_read == 0) {
	205	if (!trace->trace) {
14f28187	206	status = LTTNG_LIVE_ITERATOR_STATUS_AGAIN;
7cdc2bab MD	207	goto end;
	208	}
	209	trace->new_metadata_needed = false;
	210	goto end;
	211	}
	212
7cdc2bab MD	213	fp = bt_fmemopen(metadata_buf, len_read, "rb");
7cdc2bab MD	214	if (!fp) {
2ece7dd0	215	BT_COMP_LOGE("Cannot memory-open metadata buffer: %s",
7cdc2bab MD	216	strerror(errno));
	217	goto error;
	218	}
	219
14f28187 FD	220	/*
	221	* The call to ctf_metadata_decoder_decode will append new metadata to
	222	* our current trace class.
	223	*/
7cdc2bab MD	224	decoder_status = ctf_metadata_decoder_decode(metadata->decoder, fp);
	225	switch (decoder_status) {
	226	case CTF_METADATA_DECODER_STATUS_OK:
14f28187	227	if (!trace->trace_class) {
335a2da5 PP	228	struct ctf_trace_class *tc =
	229	ctf_metadata_decoder_borrow_ctf_trace_class(
	230	metadata->decoder);
	231
14f28187 FD	232	trace->trace_class =
	233	ctf_metadata_decoder_get_ir_trace_class(
	234	metadata->decoder);
	235	trace->trace = bt_trace_create(trace->trace_class);
335a2da5 PP	236	if (!trace->trace) {
	237	goto error;
	238	}
	239	if (ctf_trace_class_configure_ir_trace(tc,
	240	trace->trace)) {
	241	goto error;
	242	}
14f28187	243	if (!stream_classes_all_have_default_clock_class(
2ece7dd0 PP	244	trace->trace_class, log_level,
2ece7dd0 PP	245	self_comp)) {
14f28187 FD	246	/* Error logged in function. */
	247	goto error;
	248	}
	249	trace->clock_class =
	250	borrow_any_clock_class(trace->trace_class);
7cdc2bab	251	}
14f28187 FD	252	trace->new_metadata_needed = false;
14f28187 FD	253
7cdc2bab MD	254	break;
7cdc2bab MD	255	case CTF_METADATA_DECODER_STATUS_INCOMPLETE:
14f28187	256	status = LTTNG_LIVE_ITERATOR_STATUS_AGAIN;
7cdc2bab MD	257	break;
	258	case CTF_METADATA_DECODER_STATUS_ERROR:
	259	case CTF_METADATA_DECODER_STATUS_INVAL_VERSION:
	260	case CTF_METADATA_DECODER_STATUS_IR_VISITOR_ERROR:
	261	goto error;
	262	}
	263
	264	goto end;
	265	error:
14f28187	266	status = LTTNG_LIVE_ITERATOR_STATUS_ERROR;
7cdc2bab MD	267	end:
	268	if (fp) {
	269	int closeret;
	270
	271	closeret = fclose(fp);
	272	if (closeret) {
2ece7dd0	273	BT_COMP_LOGE("Error on fclose");
7cdc2bab MD	274	}
7cdc2bab MD	275	}
6f79a7cf	276	free(metadata_buf);
7cdc2bab MD	277	return status;
	278	}
	279
	280	BT_HIDDEN
	281	int lttng_live_metadata_create_stream(struct lttng_live_session *session,
2ece7dd0	282	uint64_t ctf_trace_id, uint64_t stream_id,
06994c71	283	const char *trace_name)
7cdc2bab MD	284	{
	285	struct lttng_live_metadata *metadata = NULL;
	286	struct lttng_live_trace *trace;
06994c71	287	const char *match;
0746848c	288	struct ctf_metadata_decoder_config cfg = {
c01594de	289	.log_level = session->log_level,
2ece7dd0	290	.self_comp = session->self_comp,
0746848c PP	291	.clock_class_offset_s = 0,
	292	.clock_class_offset_ns = 0,
	293	};
7cdc2bab MD	294
	295	metadata = g_new0(struct lttng_live_metadata, 1);
	296	if (!metadata) {
	297	return -1;
	298	}
c01594de	299	metadata->log_level = session->log_level;
2ece7dd0	300	metadata->self_comp = session->self_comp;
7cdc2bab	301	metadata->stream_id = stream_id;
14f28187	302
06994c71 MD	303	match = strstr(trace_name, session->session_name->str);
	304	if (!match) {
	305	goto error;
	306	}
14f28187	307
f7b785ac	308	metadata->decoder = ctf_metadata_decoder_create(&cfg);
7cdc2bab MD	309	if (!metadata->decoder) {
	310	goto error;
	311	}
14f28187	312	trace = lttng_live_borrow_trace(session, ctf_trace_id);
7cdc2bab MD	313	if (!trace) {
	314	goto error;
	315	}
	316	metadata->trace = trace;
	317	trace->metadata = metadata;
	318	return 0;
	319
	320	error:
	321	ctf_metadata_decoder_destroy(metadata->decoder);
	322	g_free(metadata);
	323	return -1;
	324	}
	325
	326	BT_HIDDEN
	327	void lttng_live_metadata_fini(struct lttng_live_trace *trace)
	328	{
	329	struct lttng_live_metadata *metadata = trace->metadata;
	330
	331	if (!metadata) {
	332	return;
	333	}
7cdc2bab MD	334	ctf_metadata_decoder_destroy(metadata->decoder);
7cdc2bab MD	335	trace->metadata = NULL;
7cdc2bab MD	336	g_free(metadata);
7cdc2bab MD	337	}