lib: introduce bt_message_iterator_class
[babeltrace.git] / src / plugins / ctf / lttng-live / lttng-live.h
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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>
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33#include <stdint.h>
34
35#include <glib.h>
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3fadfbc0 37#include <babeltrace2/babeltrace.h>
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3c22a242 39#include "common/macros.h"
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40#include "../common/metadata/decoder.h"
41#include "../common/msg-iter/msg-iter.h"
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42#include "viewer-connection.h"
43
44struct lttng_live_component;
45struct lttng_live_session;
46struct lttng_live_msg_iter;
47
48enum 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. */
68struct lttng_live_stream_iterator {
c01594de 69 bt_logging_level log_level;
2ece7dd0 70 bt_self_component *self_comp;
c01594de 71
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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;
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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 */
cad707e2 113 const bt_message *current_msg;
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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;
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124
125 bool has_stream_hung_up;
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126};
127
128struct lttng_live_metadata {
c01594de 129 bt_logging_level log_level;
2ece7dd0 130 bt_self_component *self_comp;
c01594de 131
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132 uint64_t stream_id;
133 /* Weak reference. */
134 struct ctf_metadata_decoder *decoder;
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135};
136
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137enum lttng_live_metadata_stream_state {
138 /*
139 * The metadata needs to be updated. This is either because we just
140 * created the trace and haven't asked yet, or the relay specifically
141 * told us that new metadata is available.
142 */
143 LTTNG_LIVE_METADATA_STREAM_STATE_NEEDED,
144 /*
145 * The metadata was updated and the relay has not told us we need to
146 * update it yet.
147 */
148 LTTNG_LIVE_METADATA_STREAM_STATE_NOT_NEEDED,
149 /*
150 * The relay has closed this metadata stream. We set this in reaction
151 * to a LTTNG_VIEWER_METADATA_ERR reply to a LTTNG_VIEWER_GET_METADATA
152 * command to the relay. If this field is set, we have received all the
153 * metadata that we are ever going to get for that metadata stream.
154 */
155 LTTNG_LIVE_METADATA_STREAM_STATE_CLOSED,
156};
157
14f28187 158struct lttng_live_trace {
c01594de 159 bt_logging_level log_level;
2ece7dd0 160 bt_self_component *self_comp;
c01594de 161
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162 /* Back reference to session. */
163 struct lttng_live_session *session;
164
165 /* ctf trace ID within the session. */
166 uint64_t id;
167
168 /* Owned by this. */
169 bt_trace *trace;
170
171 /* Weak reference. */
172 bt_trace_class *trace_class;
173
174 struct lttng_live_metadata *metadata;
175
176 const bt_clock_class *clock_class;
177
178 /* Array of pointers to struct lttng_live_stream_iterator. */
179 /* Owned by this. */
180 GPtrArray *stream_iterators;
181
76bbaebc 182 enum lttng_live_metadata_stream_state metadata_stream_state;
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183};
184
185struct lttng_live_session {
c01594de 186 bt_logging_level log_level;
2ece7dd0 187 bt_self_component *self_comp;
c01594de 188
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189 /* Weak reference. */
190 struct lttng_live_msg_iter *lttng_live_msg_iter;
191
192 /* Owned by this. */
193 GString *hostname;
194
195 /* Owned by this. */
196 GString *session_name;
197
198 uint64_t id;
199
200 /* Array of pointers to struct lttng_live_trace. */
201 GPtrArray *traces;
202
203 bool attached;
204 bool new_streams_needed;
205 bool lazy_stream_msg_init;
206 bool closed;
207};
208
209enum session_not_found_action {
210 SESSION_NOT_FOUND_ACTION_CONTINUE,
211 SESSION_NOT_FOUND_ACTION_FAIL,
212 SESSION_NOT_FOUND_ACTION_END,
213};
214
215/*
216 * A component instance is an iterator on a single session.
217 */
218struct lttng_live_component {
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219 bt_logging_level log_level;
220
14f28187 221 /* Weak reference. */
2ece7dd0 222 bt_self_component *self_comp;
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223
224 struct {
225 GString *url;
226 enum session_not_found_action sess_not_found_act;
227 } params;
228
229 size_t max_query_size;
230
231 /*
232 * Keeps track of whether the downstream component already has a
233 * message iterator on this component.
234 */
235 bool has_msg_iter;
236};
237
238struct lttng_live_msg_iter {
c01594de 239 bt_logging_level log_level;
2ece7dd0 240 bt_self_component *self_comp;
c01594de 241
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242 /* Weak reference. */
243 struct lttng_live_component *lttng_live_comp;
244
245 /* Weak reference. */
246 bt_self_message_iterator *self_msg_iter;
247
248 /* Owned by this. */
249 struct live_viewer_connection *viewer_connection;
250
251 /* Array of pointers to struct lttng_live_session. */
252 GPtrArray *sessions;
253
254 /* Number of live stream iterator this message iterator has.*/
255 uint64_t active_stream_iter;
256
257 /* Timestamp in nanosecond of the last message sent downstream. */
258 int64_t last_msg_ts_ns;
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259
260 /* True if the iterator was interrupted. */
261 bool was_interrupted;
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262};
263
264enum lttng_live_iterator_status {
265 /** Iterator state has progressed. Continue iteration immediately. */
266 LTTNG_LIVE_ITERATOR_STATUS_CONTINUE = 3,
267 /** No message available for now. Try again later. */
268 LTTNG_LIVE_ITERATOR_STATUS_AGAIN = 2,
269 /** No more CTF_LTTNG_LIVEs to be delivered. */
270 LTTNG_LIVE_ITERATOR_STATUS_END = 1,
271 /** No error, okay. */
272 LTTNG_LIVE_ITERATOR_STATUS_OK = 0,
273 /** Invalid arguments. */
274 LTTNG_LIVE_ITERATOR_STATUS_INVAL = -1,
275 /** General error. */
276 LTTNG_LIVE_ITERATOR_STATUS_ERROR = -2,
277 /** Out of memory. */
278 LTTNG_LIVE_ITERATOR_STATUS_NOMEM = -3,
279 /** Unsupported iterator feature. */
280 LTTNG_LIVE_ITERATOR_STATUS_UNSUPPORTED = -4,
281};
282
21a9f056 283bt_component_class_initialize_method_status lttng_live_component_init(
14f28187 284 bt_self_component_source *self_comp,
59225a3e 285 bt_self_component_source_configuration *config,
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286 const bt_value *params, void *init_method_data);
287
d24d5663 288bt_component_class_query_method_status lttng_live_query(
14f28187 289 bt_self_component_class_source *comp_class,
3c729b9a 290 bt_private_query_executor *priv_query_exec,
14f28187 291 const char *object, const bt_value *params,
7c14d641 292 void *method_data, const bt_value **result);
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293
294void lttng_live_component_finalize(bt_self_component_source *component);
295
a3f0c7db 296bt_message_iterator_class_next_method_status lttng_live_msg_iter_next(
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297 bt_self_message_iterator *iterator,
298 bt_message_array_const msgs, uint64_t capacity,
299 uint64_t *count);
300
a3f0c7db 301bt_message_iterator_class_initialize_method_status lttng_live_msg_iter_init(
14f28187 302 bt_self_message_iterator *self_msg_it,
8d8b141d 303 bt_self_message_iterator_configuration *config,
a3f0c7db 304 bt_self_component *self_comp,
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305 bt_self_component_port_output *self_port);
306
307void lttng_live_msg_iter_finalize(bt_self_message_iterator *it);
308
36e94ad6 309enum lttng_live_viewer_status lttng_live_session_attach(
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310 struct lttng_live_session *session,
311 bt_self_message_iterator *self_msg_iter);
eee8e741 312
36e94ad6 313enum lttng_live_viewer_status lttng_live_session_detach(
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314 struct lttng_live_session *session);
315
36e94ad6 316enum lttng_live_iterator_status lttng_live_session_get_new_streams(
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317 struct lttng_live_session *session,
318 bt_self_message_iterator *self_msg_iter);
14f28187 319
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320struct lttng_live_trace *lttng_live_session_borrow_or_create_trace_by_id(
321 struct lttng_live_session *session, uint64_t trace_id);
322
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323int lttng_live_add_session(struct lttng_live_msg_iter *lttng_live_msg_iter,
324 uint64_t session_id,
325 const char *hostname,
326 const char *session_name);
327
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328/*
329 * lttng_live_get_one_metadata_packet() asks the Relay Daemon for new metadata.
330 * If new metadata is received, the function writes it to the provided file
331 * handle and updates the reply_len output parameter. This function should be
332 * called in loop until _END status is received to ensure all metadata is
333 * written to the file.
334 */
335enum lttng_live_get_one_metadata_status lttng_live_get_one_metadata_packet(
336 struct lttng_live_trace *trace, FILE *fp, size_t *reply_len);
337
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338enum lttng_live_iterator_status lttng_live_get_next_index(
339 struct lttng_live_msg_iter *lttng_live_msg_iter,
340 struct lttng_live_stream_iterator *stream,
341 struct packet_index *index);
342
18a1979b 343enum ctf_msg_iter_medium_status lttng_live_get_stream_bytes(
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344 struct lttng_live_msg_iter *lttng_live_msg_iter,
345 struct lttng_live_stream_iterator *stream, uint8_t *buf,
346 uint64_t offset, uint64_t req_len, uint64_t *recv_len);
14f28187 347
9b4f9b42 348bool lttng_live_graph_is_canceled(struct lttng_live_msg_iter *msg_iter);
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349
350#endif /* BABELTRACE_PLUGIN_CTF_LTTNG_LIVE_H */
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