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

#ifndef BABELTRACE_PLUGIN_CTF_LTTNG_LIVE_H
#define BABELTRACE_PLUGIN_CTF_LTTNG_LIVE_H

/*
 * BabelTrace - LTTng-live client Component
 *
 * Copyright 2019 Francis Deslauriers <francis.deslauriers@efficios.com>
 * Copyright 2016 Jérémie Galarneau <jeremie.galarneau@efficios.com>
 * Copyright 2016 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
 *
 * Author: Jérémie Galarneau <jeremie.galarneau@efficios.com>
 *
 * 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.
 */

#include <stdbool.h>
#include <stdint.h>

#include <glib.h>

#include <babeltrace2/babeltrace.h>

#include "common/macros.h"
#include "../common/metadata/decoder.h"
#include "../common/msg-iter/msg-iter.h"
#include "viewer-connection.h"

struct lttng_live_component;
struct lttng_live_session;
struct lttng_live_msg_iter;

enum lttng_live_stream_state {
	/* This stream won't have data until some known time in the future. */
	LTTNG_LIVE_STREAM_QUIESCENT,
	/*
	 * This stream won't have data until some known time in the future and
	 * the message iterator inactivity message was already sent downstream.
	 */
	LTTNG_LIVE_STREAM_QUIESCENT_NO_DATA, /* */
	/* This stream has data ready to be consumed. */
	LTTNG_LIVE_STREAM_ACTIVE_DATA,
	/*
	 * This stream has no data left to consume. We should asked the relay
	 * for more.
	 */
	LTTNG_LIVE_STREAM_ACTIVE_NO_DATA,
	/* This stream won't have anymore data, ever. */
	LTTNG_LIVE_STREAM_EOF,
};

/* Iterator over a live stream. */
struct lttng_live_stream_iterator {
	bt_logging_level log_level;
	bt_self_component *self_comp;

	/* Owned by this. */
	bt_stream *stream;

	/* Weak reference. */
	struct lttng_live_trace *trace;

	/*
	 * Since only a single iterator per viewer connection, we have
	 * only a single message iterator per stream.
	 */
	struct ctf_msg_iter *msg_iter;

	uint64_t viewer_stream_id;

	uint64_t ctf_stream_class_id;

	/* base offset in current index. */
	uint64_t base_offset;
	/* len to read in current index. */
	uint64_t len;
	/* offset in current index. */
	uint64_t offset;

	/*
	 * Clock Snapshot value of the last message iterator inactivity message
	 * sent downstream.
	 */
	uint64_t last_inactivity_ts;

	/*
	 * Clock Snapshot value of the current message iterator inactivity
	 * message we might want to send downstream.
	 */
	uint64_t current_inactivity_ts;

	enum lttng_live_stream_state state;

	/*
	 * The current message produced by this live stream iterator. Owned by
	 * this.
	 */
	bt_message *current_msg;

	/* Timestamp in nanoseconds of the current message (current_msg). */
	int64_t current_msg_ts_ns;

	/* Owned by this. */
	uint8_t *buf;
	size_t buflen;

	/* Owned by this. */
	GString *name;

	bool has_stream_hung_up;
};

struct lttng_live_metadata {
	bt_logging_level log_level;
	bt_self_component *self_comp;

	/* Weak reference. */
	struct lttng_live_trace *trace;

	uint64_t stream_id;
	/* Weak reference. */
	struct ctf_metadata_decoder *decoder;
};

struct lttng_live_trace {
	bt_logging_level log_level;
	bt_self_component *self_comp;

	/* Back reference to session. */
	struct lttng_live_session *session;

	/* ctf trace ID within the session. */
	uint64_t id;

	/* Owned by this. */
	bt_trace *trace;

	/* Weak reference. */
	bt_trace_class *trace_class;

	struct lttng_live_metadata *metadata;

	const bt_clock_class *clock_class;

	/* Array of pointers to struct lttng_live_stream_iterator. */
	/* Owned by this. */
	GPtrArray *stream_iterators;

	bool new_metadata_needed;
};

struct lttng_live_session {
	bt_logging_level log_level;
	bt_self_component *self_comp;

	/* Weak reference. */
	struct lttng_live_msg_iter *lttng_live_msg_iter;

	/* Owned by this. */
	GString *hostname;

	/* Owned by this. */
	GString *session_name;

	uint64_t id;

	/* Array of pointers to struct lttng_live_trace. */
	GPtrArray *traces;

	bool attached;
	bool new_streams_needed;
	bool lazy_stream_msg_init;
	bool closed;
};

enum session_not_found_action {
	SESSION_NOT_FOUND_ACTION_CONTINUE,
	SESSION_NOT_FOUND_ACTION_FAIL,
	SESSION_NOT_FOUND_ACTION_END,
};

/*
 * A component instance is an iterator on a single session.
 */
struct lttng_live_component {
	bt_logging_level log_level;

	/* Weak reference. */
	bt_self_component *self_comp;

	struct {
		GString *url;
		enum session_not_found_action sess_not_found_act;
	} params;

	size_t max_query_size;

	/*
	 * Keeps track of whether the downstream component already has a
	 * message iterator on this component.
	 */
	bool has_msg_iter;
};

struct lttng_live_msg_iter {
	bt_logging_level log_level;
	bt_self_component *self_comp;

	/* Weak reference. */
	struct lttng_live_component *lttng_live_comp;

	/* Weak reference. */
	bt_self_message_iterator *self_msg_iter;

	/* Owned by this. */
	struct live_viewer_connection *viewer_connection;

	/* Array of pointers to struct lttng_live_session. */
	GPtrArray *sessions;

	/* Number of live stream iterator this message iterator has.*/
	uint64_t active_stream_iter;

	/* Timestamp in nanosecond of the last message sent downstream. */
	int64_t last_msg_ts_ns;
};

enum lttng_live_iterator_status {
	/** Iterator state has progressed. Continue iteration immediately. */
	LTTNG_LIVE_ITERATOR_STATUS_CONTINUE = 3,
	/** No message available for now. Try again later. */
	LTTNG_LIVE_ITERATOR_STATUS_AGAIN = 2,
	/** No more CTF_LTTNG_LIVEs to be delivered. */
	LTTNG_LIVE_ITERATOR_STATUS_END = 1,
	/** No error, okay. */
	LTTNG_LIVE_ITERATOR_STATUS_OK = 0,
	/** Invalid arguments. */
	LTTNG_LIVE_ITERATOR_STATUS_INVAL = -1,
	/** General error. */
	LTTNG_LIVE_ITERATOR_STATUS_ERROR = -2,
	/** Out of memory. */
	LTTNG_LIVE_ITERATOR_STATUS_NOMEM = -3,
	/** Unsupported iterator feature. */
	LTTNG_LIVE_ITERATOR_STATUS_UNSUPPORTED = -4,
};

bt_component_class_initialize_method_status lttng_live_component_init(
		bt_self_component_source *self_comp,
		bt_self_component_source_configuration *config,
		const bt_value *params, void *init_method_data);

bt_component_class_query_method_status lttng_live_query(
		bt_self_component_class_source *comp_class,
		bt_private_query_executor *priv_query_exec,
		const char *object, const bt_value *params,
		void *method_data, const bt_value **result);

void lttng_live_component_finalize(bt_self_component_source *component);

bt_component_class_message_iterator_next_method_status lttng_live_msg_iter_next(
		bt_self_message_iterator *iterator,
		bt_message_array_const msgs, uint64_t capacity,
		uint64_t *count);

bt_component_class_message_iterator_initialize_method_status lttng_live_msg_iter_init(
		bt_self_message_iterator *self_msg_it,
		bt_self_message_iterator_configuration *config,
		bt_self_component_source *self_comp,
		bt_self_component_port_output *self_port);

void lttng_live_msg_iter_finalize(bt_self_message_iterator *it);

int lttng_live_create_viewer_session(struct lttng_live_msg_iter *lttng_live_msg_iter);

enum lttng_live_attach_session_status {
	LTTNG_LIVE_ATTACH_SESSION_STATUS_OK	= 0,
	LTTNG_LIVE_ATTACH_SESSION_STATUS_ERROR	= -2,
};

enum lttng_live_attach_session_status lttng_live_attach_session(
		struct lttng_live_session *session,
		bt_self_message_iterator *self_msg_iter);

int lttng_live_detach_session(struct lttng_live_session *session);
enum lttng_live_iterator_status lttng_live_get_new_streams(
		struct lttng_live_session *session,
		bt_self_message_iterator *self_msg_iter);

int lttng_live_add_session(struct lttng_live_msg_iter *lttng_live_msg_iter,
		uint64_t session_id,
		const char *hostname,
		const char *session_name);

enum lttng_live_get_one_metadata_status {
	/* The end of the metadata stream was reached. */
	LTTNG_LIVE_GET_ONE_METADATA_STATUS_END	    = 1,
	/* One metadata packet was received and written to file. */
	LTTNG_LIVE_GET_ONE_METADATA_STATUS_OK	    = 0,
	/* The metadata stream was not found on the relay. */
	LTTNG_LIVE_GET_ONE_METADATA_STATUS_CLOSED   = -1,
	/*
	 * A critical error occurred when contacting the relay or while
	 * handling its response.
	 */
	LTTNG_LIVE_GET_ONE_METADATA_STATUS_ERROR    = -2,
};

/*
 * lttng_live_get_one_metadata_packet() asks the Relay Daemon for new metadata.
 * If new metadata is received, the function writes it to the provided file
 * handle and updates the reply_len output parameter. This function should be
 * called in loop until _END status is received to ensure all metadata is
 * written to the file.
 */
enum lttng_live_get_one_metadata_status lttng_live_get_one_metadata_packet(
		struct lttng_live_trace *trace, FILE *fp, size_t *reply_len);

enum lttng_live_iterator_status lttng_live_get_next_index(
		struct lttng_live_msg_iter *lttng_live_msg_iter,
		struct lttng_live_stream_iterator *stream,
		struct packet_index *index);

enum ctf_msg_iter_medium_status lttng_live_get_stream_bytes(
		struct lttng_live_msg_iter *lttng_live_msg_iter,
		struct lttng_live_stream_iterator *stream, uint8_t *buf,
		uint64_t offset, uint64_t req_len, uint64_t *recv_len);
void lttng_live_add_stream_iterator(struct lttng_live_msg_iter *lttng_live_msg_iter,
		struct lttng_live_stream_iterator *stream_iter);
void lttng_live_remove_stream_iterator(struct lttng_live_msg_iter *lttng_live_msg_iter,
		struct lttng_live_stream_iterator *stream_iter);

struct lttng_live_trace *lttng_live_borrow_trace(
		struct lttng_live_session *session, uint64_t trace_id);
void lttng_live_need_new_streams(struct lttng_live_msg_iter *lttng_live_msg_iter);

bool lttng_live_graph_is_canceled(struct lttng_live_msg_iter *msg_iter);

#endif /* BABELTRACE_PLUGIN_CTF_LTTNG_LIVE_H */
Commit	Line	Data
14f28187 FD	1	#ifndef BABELTRACE_PLUGIN_CTF_LTTNG_LIVE_H
	2	#define BABELTRACE_PLUGIN_CTF_LTTNG_LIVE_H
	3
	4	/*
	5	* BabelTrace - LTTng-live client Component
	6	*
	7	* Copyright 2019 Francis Deslauriers <francis.deslauriers@efficios.com>
	8	* Copyright 2016 Jérémie Galarneau <jeremie.galarneau@efficios.com>
	9	* Copyright 2016 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
	10	*
	11	* Author: Jérémie Galarneau <jeremie.galarneau@efficios.com>
	12	*
	13	* Permission is hereby granted, free of charge, to any person obtaining a copy
	14	* of this software and associated documentation files (the "Software"), to deal
	15	* in the Software without restriction, including without limitation the rights
	16	* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
	17	* copies of the Software, and to permit persons to whom the Software is
	18	* furnished to do so, subject to the following conditions:
	19	*
	20	* The above copyright notice and this permission notice shall be included in
	21	* all copies or substantial portions of the Software.
	22	*
	23	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	24	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	25	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
	26	* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	27	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
	28	* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
	29	* SOFTWARE.
	30	*/
	31
	32	#include <stdbool.h>
3c22a242 FD	33	#include <stdint.h>
	34
	35	#include <glib.h>
14f28187	36
3fadfbc0	37	#include <babeltrace2/babeltrace.h>
14f28187	38
3c22a242	39	#include "common/macros.h"
14f28187 FD	40	#include "../common/metadata/decoder.h"
14f28187 FD	41	#include "../common/msg-iter/msg-iter.h"
14f28187 FD	42	#include "viewer-connection.h"
	43
	44	struct lttng_live_component;
	45	struct lttng_live_session;
	46	struct lttng_live_msg_iter;
	47
	48	enum lttng_live_stream_state {
	49	/* This stream won't have data until some known time in the future. */
	50	LTTNG_LIVE_STREAM_QUIESCENT,
	51	/*
	52	* This stream won't have data until some known time in the future and
	53	* the message iterator inactivity message was already sent downstream.
	54	*/
	55	LTTNG_LIVE_STREAM_QUIESCENT_NO_DATA, /* */
	56	/* This stream has data ready to be consumed. */
	57	LTTNG_LIVE_STREAM_ACTIVE_DATA,
	58	/*
	59	* This stream has no data left to consume. We should asked the relay
	60	* for more.
	61	*/
	62	LTTNG_LIVE_STREAM_ACTIVE_NO_DATA,
	63	/* This stream won't have anymore data, ever. */
	64	LTTNG_LIVE_STREAM_EOF,
	65	};
	66
	67	/* Iterator over a live stream. */
	68	struct lttng_live_stream_iterator {
c01594de	69	bt_logging_level log_level;
2ece7dd0	70	bt_self_component *self_comp;
c01594de	71
14f28187 FD	72	/* Owned by this. */
	73	bt_stream *stream;
	74
	75	/* Weak reference. */
	76	struct lttng_live_trace *trace;
	77
	78	/*
	79	* Since only a single iterator per viewer connection, we have
	80	* only a single message iterator per stream.
	81	*/
18a1979b	82	struct ctf_msg_iter *msg_iter;
14f28187 FD	83
	84	uint64_t viewer_stream_id;
	85
	86	uint64_t ctf_stream_class_id;
	87
	88	/* base offset in current index. */
	89	uint64_t base_offset;
	90	/* len to read in current index. */
	91	uint64_t len;
	92	/* offset in current index. */
	93	uint64_t offset;
	94
	95	/*
	96	* Clock Snapshot value of the last message iterator inactivity message
	97	* sent downstream.
	98	*/
	99	uint64_t last_inactivity_ts;
	100
	101	/*
	102	* Clock Snapshot value of the current message iterator inactivity
	103	* message we might want to send downstream.
	104	*/
	105	uint64_t current_inactivity_ts;
	106
	107	enum lttng_live_stream_state state;
	108
	109	/*
	110	* The current message produced by this live stream iterator. Owned by
	111	* this.
	112	*/
	113	bt_message *current_msg;
	114
	115	/* Timestamp in nanoseconds of the current message (current_msg). */
	116	int64_t current_msg_ts_ns;
	117
	118	/* Owned by this. */
	119	uint8_t *buf;
	120	size_t buflen;
	121
	122	/* Owned by this. */
	123	GString *name;
4a39caef FD	124
4a39caef FD	125	bool has_stream_hung_up;
14f28187 FD	126	};
	127
	128	struct lttng_live_metadata {
c01594de	129	bt_logging_level log_level;
2ece7dd0	130	bt_self_component *self_comp;
c01594de	131
14f28187 FD	132	/* Weak reference. */
	133	struct lttng_live_trace *trace;
	134
	135	uint64_t stream_id;
	136	/* Weak reference. */
	137	struct ctf_metadata_decoder *decoder;
14f28187 FD	138	};
	139
	140	struct lttng_live_trace {
c01594de	141	bt_logging_level log_level;
2ece7dd0	142	bt_self_component *self_comp;
c01594de	143
14f28187 FD	144	/* Back reference to session. */
	145	struct lttng_live_session *session;
	146
	147	/* ctf trace ID within the session. */
	148	uint64_t id;
	149
	150	/* Owned by this. */
	151	bt_trace *trace;
	152
	153	/* Weak reference. */
	154	bt_trace_class *trace_class;
	155
	156	struct lttng_live_metadata *metadata;
	157
	158	const bt_clock_class *clock_class;
	159
	160	/* Array of pointers to struct lttng_live_stream_iterator. */
	161	/* Owned by this. */
	162	GPtrArray *stream_iterators;
	163
	164	bool new_metadata_needed;
	165	};
	166
	167	struct lttng_live_session {
c01594de	168	bt_logging_level log_level;
2ece7dd0	169	bt_self_component *self_comp;
c01594de	170
14f28187 FD	171	/* Weak reference. */
	172	struct lttng_live_msg_iter *lttng_live_msg_iter;
	173
	174	/* Owned by this. */
	175	GString *hostname;
	176
	177	/* Owned by this. */
	178	GString *session_name;
	179
	180	uint64_t id;
	181
	182	/* Array of pointers to struct lttng_live_trace. */
	183	GPtrArray *traces;
	184
	185	bool attached;
	186	bool new_streams_needed;
	187	bool lazy_stream_msg_init;
	188	bool closed;
	189	};
	190
	191	enum session_not_found_action {
	192	SESSION_NOT_FOUND_ACTION_CONTINUE,
	193	SESSION_NOT_FOUND_ACTION_FAIL,
	194	SESSION_NOT_FOUND_ACTION_END,
	195	};
	196
	197	/*
	198	* A component instance is an iterator on a single session.
	199	*/
	200	struct lttng_live_component {
c01594de PP	201	bt_logging_level log_level;
c01594de PP	202
14f28187	203	/* Weak reference. */
2ece7dd0	204	bt_self_component *self_comp;
14f28187 FD	205
	206	struct {
	207	GString *url;
	208	enum session_not_found_action sess_not_found_act;
	209	} params;
	210
	211	size_t max_query_size;
	212
	213	/*
	214	* Keeps track of whether the downstream component already has a
	215	* message iterator on this component.
	216	*/
	217	bool has_msg_iter;
	218	};
	219
	220	struct lttng_live_msg_iter {
c01594de	221	bt_logging_level log_level;
2ece7dd0	222	bt_self_component *self_comp;
c01594de	223
14f28187 FD	224	/* Weak reference. */
	225	struct lttng_live_component *lttng_live_comp;
	226
	227	/* Weak reference. */
	228	bt_self_message_iterator *self_msg_iter;
	229
	230	/* Owned by this. */
	231	struct live_viewer_connection *viewer_connection;
	232
	233	/* Array of pointers to struct lttng_live_session. */
	234	GPtrArray *sessions;
	235
	236	/* Number of live stream iterator this message iterator has.*/
	237	uint64_t active_stream_iter;
	238
	239	/* Timestamp in nanosecond of the last message sent downstream. */
	240	int64_t last_msg_ts_ns;
	241	};
	242
	243	enum lttng_live_iterator_status {
	244	/** Iterator state has progressed. Continue iteration immediately. */
	245	LTTNG_LIVE_ITERATOR_STATUS_CONTINUE = 3,
	246	/** No message available for now. Try again later. */
	247	LTTNG_LIVE_ITERATOR_STATUS_AGAIN = 2,
	248	/** No more CTF_LTTNG_LIVEs to be delivered. */
	249	LTTNG_LIVE_ITERATOR_STATUS_END = 1,
	250	/** No error, okay. */
	251	LTTNG_LIVE_ITERATOR_STATUS_OK = 0,
	252	/** Invalid arguments. */
	253	LTTNG_LIVE_ITERATOR_STATUS_INVAL = -1,
	254	/** General error. */
	255	LTTNG_LIVE_ITERATOR_STATUS_ERROR = -2,
	256	/** Out of memory. */
	257	LTTNG_LIVE_ITERATOR_STATUS_NOMEM = -3,
	258	/** Unsupported iterator feature. */
	259	LTTNG_LIVE_ITERATOR_STATUS_UNSUPPORTED = -4,
	260	};
	261
21a9f056	262	bt_component_class_initialize_method_status lttng_live_component_init(
14f28187	263	bt_self_component_source *self_comp,
59225a3e	264	bt_self_component_source_configuration *config,
14f28187 FD	265	const bt_value params, void init_method_data);
14f28187 FD	266
d24d5663	267	bt_component_class_query_method_status lttng_live_query(
14f28187	268	bt_self_component_class_source *comp_class,
3c729b9a	269	bt_private_query_executor *priv_query_exec,
14f28187	270	const char object, const bt_value params,
7c14d641	271	void method_data, const bt_value *result);
14f28187 FD	272
	273	void lttng_live_component_finalize(bt_self_component_source *component);
	274
d24d5663	275	bt_component_class_message_iterator_next_method_status lttng_live_msg_iter_next(
14f28187 FD	276	bt_self_message_iterator *iterator,
	277	bt_message_array_const msgs, uint64_t capacity,
	278	uint64_t *count);
	279
21a9f056	280	bt_component_class_message_iterator_initialize_method_status lttng_live_msg_iter_init(
14f28187	281	bt_self_message_iterator *self_msg_it,
8d8b141d	282	bt_self_message_iterator_configuration *config,
14f28187 FD	283	bt_self_component_source *self_comp,
	284	bt_self_component_port_output *self_port);
	285
	286	void lttng_live_msg_iter_finalize(bt_self_message_iterator *it);
	287
	288	int lttng_live_create_viewer_session(struct lttng_live_msg_iter *lttng_live_msg_iter);
eee8e741 FD	289
	290	enum lttng_live_attach_session_status {
	291	LTTNG_LIVE_ATTACH_SESSION_STATUS_OK = 0,
	292	LTTNG_LIVE_ATTACH_SESSION_STATUS_ERROR = -2,
	293	};
	294
	295	enum lttng_live_attach_session_status lttng_live_attach_session(
851de941 SM	296	struct lttng_live_session *session,
851de941 SM	297	bt_self_message_iterator *self_msg_iter);
eee8e741	298
14f28187 FD	299	int lttng_live_detach_session(struct lttng_live_session *session);
14f28187 FD	300	enum lttng_live_iterator_status lttng_live_get_new_streams(
851de941 SM	301	struct lttng_live_session *session,
851de941 SM	302	bt_self_message_iterator *self_msg_iter);
14f28187 FD	303
	304	int lttng_live_add_session(struct lttng_live_msg_iter *lttng_live_msg_iter,
	305	uint64_t session_id,
	306	const char *hostname,
	307	const char *session_name);
	308
c28512ab FD	309	enum lttng_live_get_one_metadata_status {
	310	/* The end of the metadata stream was reached. */
	311	LTTNG_LIVE_GET_ONE_METADATA_STATUS_END = 1,
	312	/* One metadata packet was received and written to file. */
	313	LTTNG_LIVE_GET_ONE_METADATA_STATUS_OK = 0,
	314	/* The metadata stream was not found on the relay. */
	315	LTTNG_LIVE_GET_ONE_METADATA_STATUS_CLOSED = -1,
	316	/*
	317	* A critical error occurred when contacting the relay or while
	318	* handling its response.
	319	*/
	320	LTTNG_LIVE_GET_ONE_METADATA_STATUS_ERROR = -2,
	321	};
	322
	323	/*
	324	* lttng_live_get_one_metadata_packet() asks the Relay Daemon for new metadata.
	325	* If new metadata is received, the function writes it to the provided file
	326	* handle and updates the reply_len output parameter. This function should be
	327	* called in loop until _END status is received to ensure all metadata is
	328	* written to the file.
	329	*/
	330	enum lttng_live_get_one_metadata_status lttng_live_get_one_metadata_packet(
	331	struct lttng_live_trace trace, FILE fp, size_t *reply_len);
	332
14f28187 FD	333	enum lttng_live_iterator_status lttng_live_get_next_index(
	334	struct lttng_live_msg_iter *lttng_live_msg_iter,
	335	struct lttng_live_stream_iterator *stream,
	336	struct packet_index *index);
	337
18a1979b	338	enum ctf_msg_iter_medium_status lttng_live_get_stream_bytes(
14f28187 FD	339	struct lttng_live_msg_iter *lttng_live_msg_iter,
	340	struct lttng_live_stream_iterator stream, uint8_t buf,
	341	uint64_t offset, uint64_t req_len, uint64_t *recv_len);
	342	void lttng_live_add_stream_iterator(struct lttng_live_msg_iter *lttng_live_msg_iter,
	343	struct lttng_live_stream_iterator *stream_iter);
	344	void lttng_live_remove_stream_iterator(struct lttng_live_msg_iter *lttng_live_msg_iter,
	345	struct lttng_live_stream_iterator *stream_iter);
	346
	347	struct lttng_live_trace *lttng_live_borrow_trace(
	348	struct lttng_live_session *session, uint64_t trace_id);
	349	void lttng_live_need_new_streams(struct lttng_live_msg_iter *lttng_live_msg_iter);
	350
9b4f9b42	351	bool lttng_live_graph_is_canceled(struct lttng_live_msg_iter *msg_iter);
14f28187 FD	352
14f28187 FD	353	#endif /* BABELTRACE_PLUGIN_CTF_LTTNG_LIVE_H */