Commit | Line | Data |
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f3bc2010 JG |
1 | /* |
2 | * lttng-live.c | |
3 | * | |
4 | * Babeltrace CTF LTTng-live Client Component | |
5 | * | |
bb18709b | 6 | * Copyright 2019 Francis Deslauriers <francis.deslauriers@efficios.com> |
f3bc2010 | 7 | * Copyright 2016 Jérémie Galarneau <jeremie.galarneau@efficios.com> |
7cdc2bab | 8 | * Copyright 2016 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
f3bc2010 JG |
9 | * |
10 | * Author: Jérémie Galarneau <jeremie.galarneau@efficios.com> | |
11 | * | |
12 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
13 | * of this software and associated documentation files (the "Software"), to deal | |
14 | * in the Software without restriction, including without limitation the rights | |
15 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
16 | * copies of the Software, and to permit persons to whom the Software is | |
17 | * furnished to do so, subject to the following conditions: | |
18 | * | |
19 | * The above copyright notice and this permission notice shall be included in | |
20 | * all copies or substantial portions of the Software. | |
21 | * | |
22 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
23 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
24 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
25 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
26 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
27 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
28 | * SOFTWARE. | |
29 | */ | |
30 | ||
5278d5ba | 31 | #define BT_COMP_LOG_SELF_COMP self_comp |
1c0ceb65 | 32 | #define BT_LOG_OUTPUT_LEVEL log_level |
b03487ab | 33 | #define BT_LOG_TAG "PLUGIN/SRC.CTF.LTTNG-LIVE" |
3fa1b6a3 | 34 | #include "logging/comp-logging.h" |
020bc26f | 35 | |
bb18709b FD |
36 | #include <glib.h> |
37 | #include <inttypes.h> | |
38 | #include <unistd.h> | |
39 | ||
57952005 | 40 | #include "common/assert.h" |
71c5da58 | 41 | #include <babeltrace2/babeltrace.h> |
57952005 | 42 | #include "compat/compiler.h" |
71c5da58 | 43 | #include <babeltrace2/types.h> |
f3bc2010 | 44 | |
eb8cbb9e FD |
45 | #include "plugins/common/muxing/muxing.h" |
46 | ||
7cdc2bab MD |
47 | #include "data-stream.h" |
48 | #include "metadata.h" | |
bb18709b | 49 | #include "lttng-live.h" |
7cdc2bab | 50 | |
bb18709b FD |
51 | #define MAX_QUERY_SIZE (256*1024) |
52 | #define URL_PARAM "url" | |
53 | #define SESS_NOT_FOUND_ACTION_PARAM "session-not-found-action" | |
54 | #define SESS_NOT_FOUND_ACTION_CONTINUE_STR "continue" | |
55 | #define SESS_NOT_FOUND_ACTION_FAIL_STR "fail" | |
56 | #define SESS_NOT_FOUND_ACTION_END_STR "end" | |
7cdc2bab | 57 | |
5278d5ba | 58 | #define print_dbg(fmt, ...) BT_COMP_LOGD(fmt, ## __VA_ARGS__) |
7cdc2bab | 59 | |
bb18709b FD |
60 | static |
61 | const char *print_live_iterator_status(enum lttng_live_iterator_status status) | |
62 | { | |
63 | switch (status) { | |
64 | case LTTNG_LIVE_ITERATOR_STATUS_CONTINUE: | |
65 | return "LTTNG_LIVE_ITERATOR_STATUS_CONTINUE"; | |
66 | case LTTNG_LIVE_ITERATOR_STATUS_AGAIN: | |
67 | return "LTTNG_LIVE_ITERATOR_STATUS_AGAIN"; | |
68 | case LTTNG_LIVE_ITERATOR_STATUS_END: | |
69 | return "LTTNG_LIVE_ITERATOR_STATUS_END"; | |
70 | case LTTNG_LIVE_ITERATOR_STATUS_OK: | |
71 | return "LTTNG_LIVE_ITERATOR_STATUS_OK"; | |
72 | case LTTNG_LIVE_ITERATOR_STATUS_INVAL: | |
73 | return "LTTNG_LIVE_ITERATOR_STATUS_INVAL"; | |
74 | case LTTNG_LIVE_ITERATOR_STATUS_ERROR: | |
75 | return "LTTNG_LIVE_ITERATOR_STATUS_ERROR"; | |
76 | case LTTNG_LIVE_ITERATOR_STATUS_NOMEM: | |
77 | return "LTTNG_LIVE_ITERATOR_STATUS_NOMEM"; | |
78 | case LTTNG_LIVE_ITERATOR_STATUS_UNSUPPORTED: | |
79 | return "LTTNG_LIVE_ITERATOR_STATUS_UNSUPPORTED"; | |
80 | default: | |
81 | abort(); | |
82 | } | |
83 | } | |
84 | ||
85 | static | |
86 | const char *print_state(struct lttng_live_stream_iterator *s) | |
7cdc2bab MD |
87 | { |
88 | switch (s->state) { | |
89 | case LTTNG_LIVE_STREAM_ACTIVE_NO_DATA: | |
90 | return "ACTIVE_NO_DATA"; | |
91 | case LTTNG_LIVE_STREAM_QUIESCENT_NO_DATA: | |
92 | return "QUIESCENT_NO_DATA"; | |
93 | case LTTNG_LIVE_STREAM_QUIESCENT: | |
94 | return "QUIESCENT"; | |
95 | case LTTNG_LIVE_STREAM_ACTIVE_DATA: | |
96 | return "ACTIVE_DATA"; | |
97 | case LTTNG_LIVE_STREAM_EOF: | |
98 | return "EOF"; | |
99 | default: | |
100 | return "ERROR"; | |
101 | } | |
102 | } | |
7cdc2bab | 103 | |
bb18709b FD |
104 | #define print_stream_state(live_stream_iter) \ |
105 | do { \ | |
5278d5ba | 106 | BT_COMP_LOGD("stream state %s last_inact_ts %" PRId64 \ |
bb18709b FD |
107 | ", curr_inact_ts %" PRId64, \ |
108 | print_state(live_stream_iter), \ | |
109 | live_stream_iter->last_inactivity_ts, \ | |
110 | live_stream_iter->current_inactivity_ts); \ | |
111 | } while (0); | |
6f79a7cf MD |
112 | |
113 | BT_HIDDEN | |
d73bb381 | 114 | bool lttng_live_graph_is_canceled(struct lttng_live_msg_iter *msg_iter) |
6f79a7cf | 115 | { |
bb18709b | 116 | bool ret; |
6f79a7cf | 117 | |
d73bb381 | 118 | if (!msg_iter) { |
bb18709b FD |
119 | ret = false; |
120 | goto end; | |
7cdc2bab | 121 | } |
7cdc2bab | 122 | |
d73bb381 PP |
123 | ret = bt_self_message_iterator_is_interrupted( |
124 | msg_iter->self_msg_iter); | |
4bf0e537 | 125 | |
bb18709b FD |
126 | end: |
127 | return ret; | |
7cdc2bab MD |
128 | } |
129 | ||
130 | static | |
131 | struct lttng_live_trace *lttng_live_find_trace(struct lttng_live_session *session, | |
132 | uint64_t trace_id) | |
d3e4dcd8 | 133 | { |
bb18709b FD |
134 | uint64_t trace_idx; |
135 | struct lttng_live_trace *ret_trace = NULL; | |
7cdc2bab | 136 | |
bb18709b FD |
137 | for (trace_idx = 0; trace_idx < session->traces->len; trace_idx++) { |
138 | struct lttng_live_trace *trace = | |
139 | g_ptr_array_index(session->traces, trace_idx); | |
7cdc2bab | 140 | if (trace->id == trace_id) { |
bb18709b FD |
141 | ret_trace = trace; |
142 | goto end; | |
7cdc2bab MD |
143 | } |
144 | } | |
bb18709b FD |
145 | |
146 | end: | |
147 | return ret_trace; | |
d3eb6e8f PP |
148 | } |
149 | ||
7cdc2bab | 150 | static |
bb18709b | 151 | void lttng_live_destroy_trace(struct lttng_live_trace *trace) |
7cdc2bab | 152 | { |
1c0ceb65 | 153 | bt_logging_level log_level = trace->log_level; |
5278d5ba | 154 | bt_self_component *self_comp = trace->self_comp; |
1c0ceb65 | 155 | |
5278d5ba | 156 | BT_COMP_LOGD("Destroy lttng_live_trace"); |
7cdc2bab | 157 | |
bb18709b FD |
158 | BT_ASSERT(trace->stream_iterators); |
159 | g_ptr_array_free(trace->stream_iterators, TRUE); | |
5bd230f4 | 160 | |
bb18709b FD |
161 | BT_TRACE_PUT_REF_AND_RESET(trace->trace); |
162 | BT_TRACE_CLASS_PUT_REF_AND_RESET(trace->trace_class); | |
5bd230f4 | 163 | |
7cdc2bab | 164 | lttng_live_metadata_fini(trace); |
7cdc2bab MD |
165 | g_free(trace); |
166 | } | |
167 | ||
168 | static | |
169 | struct lttng_live_trace *lttng_live_create_trace(struct lttng_live_session *session, | |
170 | uint64_t trace_id) | |
171 | { | |
172 | struct lttng_live_trace *trace = NULL; | |
1c0ceb65 | 173 | bt_logging_level log_level = session->log_level; |
5278d5ba | 174 | bt_self_component *self_comp = session->self_comp; |
7cdc2bab MD |
175 | |
176 | trace = g_new0(struct lttng_live_trace, 1); | |
177 | if (!trace) { | |
178 | goto error; | |
179 | } | |
1c0ceb65 | 180 | trace->log_level = session->log_level; |
5278d5ba | 181 | trace->self_comp = session->self_comp; |
7cdc2bab MD |
182 | trace->session = session; |
183 | trace->id = trace_id; | |
bb18709b FD |
184 | trace->trace_class = NULL; |
185 | trace->trace = NULL; | |
186 | trace->stream_iterators = g_ptr_array_new_with_free_func( | |
187 | (GDestroyNotify) lttng_live_stream_iterator_destroy); | |
188 | BT_ASSERT(trace->stream_iterators); | |
7cdc2bab | 189 | trace->new_metadata_needed = true; |
bb18709b FD |
190 | g_ptr_array_add(session->traces, trace); |
191 | ||
5278d5ba | 192 | BT_COMP_LOGI("Create trace"); |
7cdc2bab MD |
193 | goto end; |
194 | error: | |
195 | g_free(trace); | |
196 | trace = NULL; | |
197 | end: | |
198 | return trace; | |
199 | } | |
200 | ||
201 | BT_HIDDEN | |
bb18709b FD |
202 | struct lttng_live_trace *lttng_live_borrow_trace( |
203 | struct lttng_live_session *session, uint64_t trace_id) | |
7cdc2bab MD |
204 | { |
205 | struct lttng_live_trace *trace; | |
206 | ||
207 | trace = lttng_live_find_trace(session, trace_id); | |
208 | if (trace) { | |
bb18709b | 209 | goto end; |
7cdc2bab | 210 | } |
7cdc2bab | 211 | |
bb18709b FD |
212 | /* The session is the owner of the newly created trace. */ |
213 | trace = lttng_live_create_trace(session, trace_id); | |
7cdc2bab | 214 | |
bb18709b FD |
215 | end: |
216 | return trace; | |
7cdc2bab MD |
217 | } |
218 | ||
219 | BT_HIDDEN | |
bb18709b | 220 | int lttng_live_add_session(struct lttng_live_msg_iter *lttng_live_msg_iter, |
06994c71 MD |
221 | uint64_t session_id, const char *hostname, |
222 | const char *session_name) | |
7cdc2bab MD |
223 | { |
224 | int ret = 0; | |
bb18709b | 225 | struct lttng_live_session *session; |
1c0ceb65 | 226 | bt_logging_level log_level = lttng_live_msg_iter->log_level; |
5278d5ba | 227 | bt_self_component *self_comp = lttng_live_msg_iter->self_comp; |
7cdc2bab | 228 | |
bb18709b FD |
229 | session = g_new0(struct lttng_live_session, 1); |
230 | if (!session) { | |
7cdc2bab MD |
231 | goto error; |
232 | } | |
233 | ||
1c0ceb65 | 234 | session->log_level = lttng_live_msg_iter->log_level; |
5278d5ba | 235 | session->self_comp = lttng_live_msg_iter->self_comp; |
bb18709b FD |
236 | session->id = session_id; |
237 | session->traces = g_ptr_array_new_with_free_func( | |
238 | (GDestroyNotify) lttng_live_destroy_trace); | |
239 | BT_ASSERT(session->traces); | |
240 | session->lttng_live_msg_iter = lttng_live_msg_iter; | |
241 | session->new_streams_needed = true; | |
242 | session->hostname = g_string_new(hostname); | |
243 | BT_ASSERT(session->hostname); | |
244 | ||
245 | session->session_name = g_string_new(session_name); | |
246 | BT_ASSERT(session->session_name); | |
7cdc2bab | 247 | |
5278d5ba | 248 | BT_COMP_LOGI("Reading from session: %" PRIu64 " hostname: %s session_name: %s", |
bb18709b FD |
249 | session->id, hostname, session_name); |
250 | g_ptr_array_add(lttng_live_msg_iter->sessions, session); | |
7cdc2bab MD |
251 | goto end; |
252 | error: | |
5278d5ba | 253 | BT_COMP_LOGE("Error adding session"); |
bb18709b | 254 | g_free(session); |
7cdc2bab MD |
255 | ret = -1; |
256 | end: | |
257 | return ret; | |
258 | } | |
259 | ||
260 | static | |
261 | void lttng_live_destroy_session(struct lttng_live_session *session) | |
262 | { | |
1c0ceb65 | 263 | bt_logging_level log_level; |
5278d5ba | 264 | bt_self_component *self_comp; |
bb18709b FD |
265 | |
266 | if (!session) { | |
267 | goto end; | |
268 | } | |
7cdc2bab | 269 | |
1c0ceb65 | 270 | log_level = session->log_level; |
5278d5ba PP |
271 | self_comp = session->self_comp; |
272 | BT_COMP_LOGD("Destroy lttng live session"); | |
7cdc2bab MD |
273 | if (session->id != -1ULL) { |
274 | if (lttng_live_detach_session(session)) { | |
bb18709b | 275 | if (session->lttng_live_msg_iter && |
d73bb381 PP |
276 | !lttng_live_graph_is_canceled( |
277 | session->lttng_live_msg_iter)) { | |
4c66436f | 278 | /* Old relayd cannot detach sessions. */ |
5278d5ba | 279 | BT_COMP_LOGD("Unable to detach lttng live session %" PRIu64, |
4c66436f MD |
280 | session->id); |
281 | } | |
7cdc2bab MD |
282 | } |
283 | session->id = -1ULL; | |
284 | } | |
bb18709b FD |
285 | |
286 | if (session->traces) { | |
287 | g_ptr_array_free(session->traces, TRUE); | |
7cdc2bab | 288 | } |
bb18709b | 289 | |
06994c71 MD |
290 | if (session->hostname) { |
291 | g_string_free(session->hostname, TRUE); | |
292 | } | |
293 | if (session->session_name) { | |
294 | g_string_free(session->session_name, TRUE); | |
295 | } | |
7cdc2bab | 296 | g_free(session); |
bb18709b FD |
297 | |
298 | end: | |
299 | return; | |
7cdc2bab MD |
300 | } |
301 | ||
bb18709b FD |
302 | static |
303 | void lttng_live_msg_iter_destroy(struct lttng_live_msg_iter *lttng_live_msg_iter) | |
7cdc2bab | 304 | { |
bb18709b FD |
305 | if (!lttng_live_msg_iter) { |
306 | goto end; | |
7cdc2bab | 307 | } |
7cdc2bab | 308 | |
bb18709b FD |
309 | if (lttng_live_msg_iter->sessions) { |
310 | g_ptr_array_free(lttng_live_msg_iter->sessions, TRUE); | |
7cdc2bab | 311 | } |
bb18709b FD |
312 | |
313 | BT_OBJECT_PUT_REF_AND_RESET(lttng_live_msg_iter->viewer_connection); | |
314 | BT_ASSERT(lttng_live_msg_iter->lttng_live_comp); | |
315 | BT_ASSERT(lttng_live_msg_iter->lttng_live_comp->has_msg_iter); | |
316 | ||
317 | /* All stream iterators must be destroyed at this point. */ | |
318 | BT_ASSERT(lttng_live_msg_iter->active_stream_iter == 0); | |
319 | lttng_live_msg_iter->lttng_live_comp->has_msg_iter = false; | |
320 | ||
321 | g_free(lttng_live_msg_iter); | |
322 | ||
323 | end: | |
324 | return; | |
325 | } | |
326 | ||
327 | BT_HIDDEN | |
328 | void lttng_live_msg_iter_finalize(bt_self_message_iterator *self_msg_iter) | |
329 | { | |
330 | struct lttng_live_msg_iter *lttng_live_msg_iter; | |
331 | ||
332 | BT_ASSERT(self_msg_iter); | |
333 | ||
334 | lttng_live_msg_iter = bt_self_message_iterator_get_data(self_msg_iter); | |
335 | BT_ASSERT(lttng_live_msg_iter); | |
336 | lttng_live_msg_iter_destroy(lttng_live_msg_iter); | |
7cdc2bab MD |
337 | } |
338 | ||
339 | static | |
bb18709b | 340 | enum lttng_live_iterator_status lttng_live_iterator_next_check_stream_state( |
7cdc2bab MD |
341 | struct lttng_live_stream_iterator *lttng_live_stream) |
342 | { | |
1c0ceb65 | 343 | bt_logging_level log_level = lttng_live_stream->log_level; |
5278d5ba | 344 | bt_self_component *self_comp = lttng_live_stream->self_comp; |
1c0ceb65 | 345 | |
7cdc2bab MD |
346 | switch (lttng_live_stream->state) { |
347 | case LTTNG_LIVE_STREAM_QUIESCENT: | |
348 | case LTTNG_LIVE_STREAM_ACTIVE_DATA: | |
349 | break; | |
350 | case LTTNG_LIVE_STREAM_ACTIVE_NO_DATA: | |
351 | /* Invalid state. */ | |
5278d5ba | 352 | BT_COMP_LOGF("Unexpected stream state \"ACTIVE_NO_DATA\""); |
087bc060 | 353 | abort(); |
7cdc2bab MD |
354 | case LTTNG_LIVE_STREAM_QUIESCENT_NO_DATA: |
355 | /* Invalid state. */ | |
5278d5ba | 356 | BT_COMP_LOGF("Unexpected stream state \"QUIESCENT_NO_DATA\""); |
087bc060 | 357 | abort(); |
7cdc2bab MD |
358 | case LTTNG_LIVE_STREAM_EOF: |
359 | break; | |
360 | } | |
bb18709b | 361 | return LTTNG_LIVE_ITERATOR_STATUS_OK; |
7cdc2bab MD |
362 | } |
363 | ||
364 | /* | |
365 | * For active no data stream, fetch next data. It can be either: | |
366 | * - quiescent: need to put it in the prio heap at quiescent end | |
367 | * timestamp, | |
368 | * - have data: need to wire up first event into the prio heap, | |
369 | * - have no data on this stream at this point: need to retry (AGAIN) or | |
370 | * return EOF. | |
371 | */ | |
372 | static | |
bb18709b FD |
373 | enum lttng_live_iterator_status lttng_live_iterator_next_handle_one_no_data_stream( |
374 | struct lttng_live_msg_iter *lttng_live_msg_iter, | |
7cdc2bab MD |
375 | struct lttng_live_stream_iterator *lttng_live_stream) |
376 | { | |
1c0ceb65 | 377 | bt_logging_level log_level = lttng_live_msg_iter->log_level; |
5278d5ba | 378 | bt_self_component *self_comp = lttng_live_msg_iter->self_comp; |
bb18709b FD |
379 | enum lttng_live_iterator_status ret = |
380 | LTTNG_LIVE_ITERATOR_STATUS_OK; | |
7cdc2bab MD |
381 | struct packet_index index; |
382 | enum lttng_live_stream_state orig_state = lttng_live_stream->state; | |
383 | ||
384 | if (lttng_live_stream->trace->new_metadata_needed) { | |
bb18709b | 385 | ret = LTTNG_LIVE_ITERATOR_STATUS_CONTINUE; |
7cdc2bab MD |
386 | goto end; |
387 | } | |
388 | if (lttng_live_stream->trace->session->new_streams_needed) { | |
bb18709b | 389 | ret = LTTNG_LIVE_ITERATOR_STATUS_CONTINUE; |
7cdc2bab MD |
390 | goto end; |
391 | } | |
bb18709b FD |
392 | if (lttng_live_stream->state != LTTNG_LIVE_STREAM_ACTIVE_NO_DATA && |
393 | lttng_live_stream->state != LTTNG_LIVE_STREAM_QUIESCENT_NO_DATA) { | |
7cdc2bab MD |
394 | goto end; |
395 | } | |
bb18709b FD |
396 | ret = lttng_live_get_next_index(lttng_live_msg_iter, lttng_live_stream, |
397 | &index); | |
398 | if (ret != LTTNG_LIVE_ITERATOR_STATUS_OK) { | |
7cdc2bab MD |
399 | goto end; |
400 | } | |
8b45963b | 401 | BT_ASSERT(lttng_live_stream->state != LTTNG_LIVE_STREAM_EOF); |
7cdc2bab | 402 | if (lttng_live_stream->state == LTTNG_LIVE_STREAM_QUIESCENT) { |
bb18709b FD |
403 | uint64_t last_inact_ts = lttng_live_stream->last_inactivity_ts, |
404 | curr_inact_ts = lttng_live_stream->current_inactivity_ts; | |
405 | ||
406 | if (orig_state == LTTNG_LIVE_STREAM_QUIESCENT_NO_DATA && | |
407 | last_inact_ts == curr_inact_ts) { | |
408 | ret = LTTNG_LIVE_ITERATOR_STATUS_AGAIN; | |
7cdc2bab MD |
409 | print_stream_state(lttng_live_stream); |
410 | } else { | |
bb18709b | 411 | ret = LTTNG_LIVE_ITERATOR_STATUS_CONTINUE; |
7cdc2bab MD |
412 | } |
413 | goto end; | |
414 | } | |
415 | lttng_live_stream->base_offset = index.offset; | |
416 | lttng_live_stream->offset = index.offset; | |
417 | lttng_live_stream->len = index.packet_size / CHAR_BIT; | |
418 | end: | |
bb18709b FD |
419 | if (ret == LTTNG_LIVE_ITERATOR_STATUS_OK) { |
420 | ret = lttng_live_iterator_next_check_stream_state(lttng_live_stream); | |
7cdc2bab MD |
421 | } |
422 | return ret; | |
423 | } | |
424 | ||
425 | /* | |
bb18709b FD |
426 | * Creation of the message requires the ctf trace class to be created |
427 | * beforehand, but the live protocol gives us all streams (including metadata) | |
428 | * at once. So we split it in three steps: getting streams, getting metadata | |
429 | * (which creates the ctf trace class), and then creating the per-stream | |
430 | * messages. | |
7cdc2bab MD |
431 | */ |
432 | static | |
bb18709b FD |
433 | enum lttng_live_iterator_status lttng_live_get_session( |
434 | struct lttng_live_msg_iter *lttng_live_msg_iter, | |
7cdc2bab MD |
435 | struct lttng_live_session *session) |
436 | { | |
bb18709b FD |
437 | enum lttng_live_iterator_status status; |
438 | uint64_t trace_idx; | |
439 | int ret = 0; | |
7cdc2bab | 440 | |
bb18709b FD |
441 | if (!session->attached) { |
442 | ret = lttng_live_attach_session(session); | |
443 | if (ret) { | |
199cb5d7 | 444 | if (lttng_live_msg_iter && lttng_live_graph_is_canceled( |
d73bb381 | 445 | lttng_live_msg_iter)) { |
bb18709b FD |
446 | status = LTTNG_LIVE_ITERATOR_STATUS_AGAIN; |
447 | } else { | |
448 | status = LTTNG_LIVE_ITERATOR_STATUS_ERROR; | |
449 | } | |
450 | goto end; | |
4c66436f | 451 | } |
7cdc2bab | 452 | } |
bb18709b | 453 | |
7cdc2bab | 454 | status = lttng_live_get_new_streams(session); |
bb18709b FD |
455 | if (status != LTTNG_LIVE_ITERATOR_STATUS_OK && |
456 | status != LTTNG_LIVE_ITERATOR_STATUS_END) { | |
457 | goto end; | |
7cdc2bab | 458 | } |
bb18709b FD |
459 | for (trace_idx = 0; trace_idx < session->traces->len; trace_idx++) { |
460 | struct lttng_live_trace *trace = | |
461 | g_ptr_array_index(session->traces, trace_idx); | |
462 | ||
7cdc2bab | 463 | status = lttng_live_metadata_update(trace); |
bb18709b FD |
464 | if (status != LTTNG_LIVE_ITERATOR_STATUS_OK && |
465 | status != LTTNG_LIVE_ITERATOR_STATUS_END) { | |
466 | goto end; | |
7cdc2bab MD |
467 | } |
468 | } | |
bb18709b FD |
469 | status = lttng_live_lazy_msg_init(session); |
470 | ||
471 | end: | |
472 | return status; | |
7cdc2bab MD |
473 | } |
474 | ||
475 | BT_HIDDEN | |
bb18709b | 476 | void lttng_live_need_new_streams(struct lttng_live_msg_iter *lttng_live_msg_iter) |
7cdc2bab | 477 | { |
bb18709b | 478 | uint64_t session_idx; |
7cdc2bab | 479 | |
bb18709b FD |
480 | for (session_idx = 0; session_idx < lttng_live_msg_iter->sessions->len; |
481 | session_idx++) { | |
482 | struct lttng_live_session *session = | |
483 | g_ptr_array_index(lttng_live_msg_iter->sessions, session_idx); | |
7cdc2bab MD |
484 | session->new_streams_needed = true; |
485 | } | |
486 | } | |
487 | ||
488 | static | |
bb18709b | 489 | void lttng_live_force_new_streams_and_metadata(struct lttng_live_msg_iter *lttng_live_msg_iter) |
7cdc2bab | 490 | { |
bb18709b | 491 | uint64_t session_idx, trace_idx; |
7cdc2bab | 492 | |
bb18709b FD |
493 | for (session_idx = 0; session_idx < lttng_live_msg_iter->sessions->len; |
494 | session_idx++) { | |
495 | struct lttng_live_session *session = | |
496 | g_ptr_array_index(lttng_live_msg_iter->sessions, session_idx); | |
7cdc2bab | 497 | session->new_streams_needed = true; |
bb18709b FD |
498 | for (trace_idx = 0; trace_idx < session->traces->len; |
499 | trace_idx++) { | |
500 | struct lttng_live_trace *trace = | |
501 | g_ptr_array_index(session->traces, trace_idx); | |
7cdc2bab MD |
502 | trace->new_metadata_needed = true; |
503 | } | |
504 | } | |
505 | } | |
506 | ||
507 | static | |
bb18709b FD |
508 | enum lttng_live_iterator_status |
509 | lttng_live_iterator_handle_new_streams_and_metadata( | |
510 | struct lttng_live_msg_iter *lttng_live_msg_iter) | |
7cdc2bab | 511 | { |
bb18709b FD |
512 | enum lttng_live_iterator_status ret = |
513 | LTTNG_LIVE_ITERATOR_STATUS_OK; | |
514 | uint64_t session_idx = 0, nr_sessions_opened = 0; | |
515 | struct lttng_live_session *session; | |
516 | enum session_not_found_action sess_not_found_act = | |
517 | lttng_live_msg_iter->lttng_live_comp->params.sess_not_found_act; | |
518 | ||
7cdc2bab | 519 | /* |
bb18709b | 520 | * In a remotely distant future, we could add a "new |
7cdc2bab MD |
521 | * session" flag to the protocol, which would tell us that we |
522 | * need to query for new sessions even though we have sessions | |
523 | * currently ongoing. | |
524 | */ | |
bb18709b FD |
525 | if (lttng_live_msg_iter->sessions->len == 0) { |
526 | if (sess_not_found_act != SESSION_NOT_FOUND_ACTION_CONTINUE) { | |
527 | ret = LTTNG_LIVE_ITERATOR_STATUS_END; | |
528 | goto end; | |
529 | } else { | |
530 | /* | |
531 | * Retry to create a viewer session for the requested | |
532 | * session name. | |
533 | */ | |
534 | if (lttng_live_create_viewer_session(lttng_live_msg_iter)) { | |
535 | ret = LTTNG_LIVE_ITERATOR_STATUS_ERROR; | |
536 | goto end; | |
537 | } | |
538 | } | |
7cdc2bab | 539 | } |
bb18709b FD |
540 | |
541 | for (session_idx = 0; session_idx < lttng_live_msg_iter->sessions->len; | |
542 | session_idx++) { | |
543 | session = g_ptr_array_index(lttng_live_msg_iter->sessions, | |
544 | session_idx); | |
545 | ret = lttng_live_get_session(lttng_live_msg_iter, session); | |
7cdc2bab | 546 | switch (ret) { |
bb18709b | 547 | case LTTNG_LIVE_ITERATOR_STATUS_OK: |
7cdc2bab | 548 | break; |
bb18709b FD |
549 | case LTTNG_LIVE_ITERATOR_STATUS_END: |
550 | ret = LTTNG_LIVE_ITERATOR_STATUS_OK; | |
7cdc2bab MD |
551 | break; |
552 | default: | |
553 | goto end; | |
554 | } | |
555 | if (!session->closed) { | |
556 | nr_sessions_opened++; | |
557 | } | |
558 | } | |
559 | end: | |
bb18709b FD |
560 | if (ret == LTTNG_LIVE_ITERATOR_STATUS_OK && |
561 | sess_not_found_act != SESSION_NOT_FOUND_ACTION_CONTINUE && | |
562 | nr_sessions_opened == 0) { | |
563 | ret = LTTNG_LIVE_ITERATOR_STATUS_END; | |
7cdc2bab MD |
564 | } |
565 | return ret; | |
566 | } | |
567 | ||
568 | static | |
bb18709b FD |
569 | enum lttng_live_iterator_status emit_inactivity_message( |
570 | struct lttng_live_msg_iter *lttng_live_msg_iter, | |
571 | struct lttng_live_stream_iterator *stream_iter, | |
572 | bt_message **message, uint64_t timestamp) | |
7cdc2bab | 573 | { |
bb18709b FD |
574 | enum lttng_live_iterator_status ret = |
575 | LTTNG_LIVE_ITERATOR_STATUS_OK; | |
576 | bt_message *msg = NULL; | |
7cdc2bab | 577 | |
bb18709b FD |
578 | BT_ASSERT(stream_iter->trace->clock_class); |
579 | ||
580 | msg = bt_message_message_iterator_inactivity_create( | |
581 | lttng_live_msg_iter->self_msg_iter, | |
582 | stream_iter->trace->clock_class, | |
583 | timestamp); | |
b09a5592 | 584 | if (!msg) { |
7cdc2bab MD |
585 | goto error; |
586 | } | |
bb18709b | 587 | |
b09a5592 | 588 | *message = msg; |
7cdc2bab | 589 | end: |
7cdc2bab MD |
590 | return ret; |
591 | ||
592 | error: | |
bb18709b | 593 | ret = LTTNG_LIVE_ITERATOR_STATUS_ERROR; |
b09a5592 | 594 | bt_message_put_ref(msg); |
7cdc2bab MD |
595 | goto end; |
596 | } | |
597 | ||
598 | static | |
bb18709b FD |
599 | enum lttng_live_iterator_status lttng_live_iterator_next_handle_one_quiescent_stream( |
600 | struct lttng_live_msg_iter *lttng_live_msg_iter, | |
7cdc2bab | 601 | struct lttng_live_stream_iterator *lttng_live_stream, |
bb18709b | 602 | bt_message **message) |
7cdc2bab | 603 | { |
bb18709b FD |
604 | enum lttng_live_iterator_status ret = |
605 | LTTNG_LIVE_ITERATOR_STATUS_OK; | |
7cdc2bab MD |
606 | |
607 | if (lttng_live_stream->state != LTTNG_LIVE_STREAM_QUIESCENT) { | |
bb18709b | 608 | return LTTNG_LIVE_ITERATOR_STATUS_OK; |
7cdc2bab MD |
609 | } |
610 | ||
bb18709b FD |
611 | if (lttng_live_stream->current_inactivity_ts == |
612 | lttng_live_stream->last_inactivity_ts) { | |
7cdc2bab | 613 | lttng_live_stream->state = LTTNG_LIVE_STREAM_QUIESCENT_NO_DATA; |
bb18709b FD |
614 | ret = LTTNG_LIVE_ITERATOR_STATUS_CONTINUE; |
615 | goto end; | |
616 | } | |
617 | ||
618 | ret = emit_inactivity_message(lttng_live_msg_iter, lttng_live_stream, | |
619 | message, lttng_live_stream->current_inactivity_ts); | |
620 | ||
621 | lttng_live_stream->last_inactivity_ts = | |
622 | lttng_live_stream->current_inactivity_ts; | |
623 | end: | |
624 | return ret; | |
625 | } | |
626 | ||
627 | static | |
628 | int live_get_msg_ts_ns(struct lttng_live_stream_iterator *stream_iter, | |
629 | struct lttng_live_msg_iter *lttng_live_msg_iter, | |
630 | const bt_message *msg, int64_t last_msg_ts_ns, | |
631 | int64_t *ts_ns) | |
632 | { | |
633 | const bt_clock_class *clock_class = NULL; | |
634 | const bt_clock_snapshot *clock_snapshot = NULL; | |
635 | int ret = 0; | |
1c0ceb65 | 636 | bt_logging_level log_level = lttng_live_msg_iter->log_level; |
5278d5ba | 637 | bt_self_component *self_comp = lttng_live_msg_iter->self_comp; |
bb18709b FD |
638 | |
639 | BT_ASSERT(msg); | |
640 | BT_ASSERT(ts_ns); | |
641 | ||
5278d5ba | 642 | BT_COMP_LOGD("Getting message's timestamp: iter-data-addr=%p, msg-addr=%p, " |
bb18709b FD |
643 | "last-msg-ts=%" PRId64, lttng_live_msg_iter, msg, |
644 | last_msg_ts_ns); | |
645 | ||
646 | switch (bt_message_get_type(msg)) { | |
647 | case BT_MESSAGE_TYPE_EVENT: | |
648 | clock_class = | |
649 | bt_message_event_borrow_stream_class_default_clock_class_const( | |
650 | msg); | |
651 | BT_ASSERT(clock_class); | |
652 | ||
11ddb3ef PP |
653 | clock_snapshot = bt_message_event_borrow_default_clock_snapshot_const( |
654 | msg); | |
bb18709b FD |
655 | break; |
656 | case BT_MESSAGE_TYPE_PACKET_BEGINNING: | |
657 | clock_class = | |
658 | bt_message_packet_beginning_borrow_stream_class_default_clock_class_const( | |
659 | msg); | |
660 | BT_ASSERT(clock_class); | |
661 | ||
11ddb3ef PP |
662 | clock_snapshot = bt_message_packet_beginning_borrow_default_clock_snapshot_const( |
663 | msg); | |
bb18709b FD |
664 | break; |
665 | case BT_MESSAGE_TYPE_PACKET_END: | |
666 | clock_class = | |
667 | bt_message_packet_end_borrow_stream_class_default_clock_class_const( | |
668 | msg); | |
669 | BT_ASSERT(clock_class); | |
670 | ||
11ddb3ef PP |
671 | clock_snapshot = bt_message_packet_end_borrow_default_clock_snapshot_const( |
672 | msg); | |
bb18709b FD |
673 | break; |
674 | case BT_MESSAGE_TYPE_DISCARDED_EVENTS: | |
675 | clock_class = | |
676 | bt_message_discarded_events_borrow_stream_class_default_clock_class_const( | |
677 | msg); | |
678 | BT_ASSERT(clock_class); | |
679 | ||
5ef34326 | 680 | clock_snapshot = bt_message_discarded_events_borrow_beginning_default_clock_snapshot_const( |
11ddb3ef | 681 | msg); |
bb18709b FD |
682 | break; |
683 | case BT_MESSAGE_TYPE_DISCARDED_PACKETS: | |
684 | clock_class = | |
685 | bt_message_discarded_packets_borrow_stream_class_default_clock_class_const( | |
686 | msg); | |
687 | BT_ASSERT(clock_class); | |
688 | ||
5ef34326 | 689 | clock_snapshot = bt_message_discarded_packets_borrow_beginning_default_clock_snapshot_const( |
11ddb3ef | 690 | msg); |
bb18709b | 691 | break; |
bb18709b | 692 | case BT_MESSAGE_TYPE_MESSAGE_ITERATOR_INACTIVITY: |
11ddb3ef | 693 | clock_snapshot = |
bb18709b | 694 | bt_message_message_iterator_inactivity_borrow_default_clock_snapshot_const( |
11ddb3ef | 695 | msg); |
bb18709b FD |
696 | break; |
697 | default: | |
698 | /* All the other messages have a higher priority */ | |
5278d5ba | 699 | BT_COMP_LOGD_STR("Message has no timestamp: using the last message timestamp."); |
bb18709b | 700 | *ts_ns = last_msg_ts_ns; |
7cdc2bab MD |
701 | goto end; |
702 | } | |
703 | ||
bb18709b FD |
704 | clock_class = bt_clock_snapshot_borrow_clock_class_const(clock_snapshot); |
705 | BT_ASSERT(clock_class); | |
706 | ||
707 | ret = bt_clock_snapshot_get_ns_from_origin(clock_snapshot, ts_ns); | |
708 | if (ret) { | |
5278d5ba | 709 | BT_COMP_LOGE("Cannot get nanoseconds from Epoch of clock snapshot: " |
bb18709b FD |
710 | "clock-snapshot-addr=%p", clock_snapshot); |
711 | goto error; | |
712 | } | |
713 | ||
714 | goto end; | |
715 | ||
bb18709b FD |
716 | error: |
717 | ret = -1; | |
7cdc2bab | 718 | |
7cdc2bab | 719 | end: |
bb18709b | 720 | if (ret == 0) { |
5278d5ba | 721 | BT_COMP_LOGD("Found message's timestamp: " |
bb18709b FD |
722 | "iter-data-addr=%p, msg-addr=%p, " |
723 | "last-msg-ts=%" PRId64 ", ts=%" PRId64, | |
724 | lttng_live_msg_iter, msg, last_msg_ts_ns, *ts_ns); | |
725 | } | |
726 | ||
7cdc2bab MD |
727 | return ret; |
728 | } | |
729 | ||
730 | static | |
bb18709b FD |
731 | enum lttng_live_iterator_status lttng_live_iterator_next_handle_one_active_data_stream( |
732 | struct lttng_live_msg_iter *lttng_live_msg_iter, | |
7cdc2bab | 733 | struct lttng_live_stream_iterator *lttng_live_stream, |
bb18709b | 734 | bt_message **message) |
7cdc2bab | 735 | { |
bb18709b | 736 | enum lttng_live_iterator_status ret = LTTNG_LIVE_ITERATOR_STATUS_OK; |
b09a5592 | 737 | enum bt_msg_iter_status status; |
bb18709b | 738 | uint64_t session_idx, trace_idx; |
1c0ceb65 | 739 | bt_logging_level log_level = lttng_live_msg_iter->log_level; |
5278d5ba | 740 | bt_self_component *self_comp = lttng_live_msg_iter->self_comp; |
7cdc2bab | 741 | |
bb18709b FD |
742 | for (session_idx = 0; session_idx < lttng_live_msg_iter->sessions->len; |
743 | session_idx++) { | |
744 | struct lttng_live_session *session = | |
745 | g_ptr_array_index(lttng_live_msg_iter->sessions, session_idx); | |
7cdc2bab MD |
746 | |
747 | if (session->new_streams_needed) { | |
bb18709b FD |
748 | ret = LTTNG_LIVE_ITERATOR_STATUS_CONTINUE; |
749 | goto end; | |
7cdc2bab | 750 | } |
bb18709b FD |
751 | for (trace_idx = 0; trace_idx < session->traces->len; |
752 | trace_idx++) { | |
753 | struct lttng_live_trace *trace = | |
754 | g_ptr_array_index(session->traces, trace_idx); | |
7cdc2bab | 755 | if (trace->new_metadata_needed) { |
bb18709b FD |
756 | ret = LTTNG_LIVE_ITERATOR_STATUS_CONTINUE; |
757 | goto end; | |
7cdc2bab MD |
758 | } |
759 | } | |
760 | } | |
761 | ||
762 | if (lttng_live_stream->state != LTTNG_LIVE_STREAM_ACTIVE_DATA) { | |
bb18709b FD |
763 | ret = LTTNG_LIVE_ITERATOR_STATUS_ERROR; |
764 | goto end; | |
7cdc2bab | 765 | } |
bb18709b FD |
766 | |
767 | status = bt_msg_iter_get_next_message(lttng_live_stream->msg_iter, | |
768 | lttng_live_msg_iter->self_msg_iter, message); | |
7cdc2bab | 769 | switch (status) { |
b09a5592 | 770 | case BT_MSG_ITER_STATUS_EOF: |
bb18709b | 771 | ret = LTTNG_LIVE_ITERATOR_STATUS_END; |
7cdc2bab | 772 | break; |
b09a5592 | 773 | case BT_MSG_ITER_STATUS_OK: |
bb18709b | 774 | ret = LTTNG_LIVE_ITERATOR_STATUS_OK; |
7cdc2bab | 775 | break; |
b09a5592 | 776 | case BT_MSG_ITER_STATUS_AGAIN: |
7cdc2bab MD |
777 | /* |
778 | * Continue immediately (end of packet). The next | |
779 | * get_index may return AGAIN to delay the following | |
780 | * attempt. | |
781 | */ | |
bb18709b | 782 | ret = LTTNG_LIVE_ITERATOR_STATUS_CONTINUE; |
7cdc2bab | 783 | break; |
b09a5592 | 784 | case BT_MSG_ITER_STATUS_INVAL: |
7cdc2bab | 785 | /* No argument provided by the user, so don't return INVAL. */ |
b09a5592 | 786 | case BT_MSG_ITER_STATUS_ERROR: |
7cdc2bab | 787 | default: |
bb18709b | 788 | ret = LTTNG_LIVE_ITERATOR_STATUS_ERROR; |
5278d5ba | 789 | BT_COMP_LOGW("CTF msg iterator return an error or failed msg_iter=%p", |
bb18709b | 790 | lttng_live_stream->msg_iter); |
7cdc2bab MD |
791 | break; |
792 | } | |
bb18709b FD |
793 | |
794 | end: | |
7cdc2bab MD |
795 | return ret; |
796 | } | |
797 | ||
5b337d32 FD |
798 | static |
799 | enum lttng_live_iterator_status lttng_live_iterator_close_stream( | |
800 | struct lttng_live_msg_iter *lttng_live_msg_iter, | |
801 | struct lttng_live_stream_iterator *stream_iter, | |
802 | bt_message **curr_msg) | |
803 | { | |
804 | enum lttng_live_iterator_status live_status = | |
805 | LTTNG_LIVE_ITERATOR_STATUS_OK; | |
806 | /* | |
807 | * The viewer has hung up on us so we are closing the stream. The | |
808 | * `bt_msg_iter` should simply realize that it needs to close the | |
809 | * stream properly by emitting the necessary stream end message. | |
810 | */ | |
811 | enum bt_msg_iter_status status = | |
812 | bt_msg_iter_get_next_message(stream_iter->msg_iter, | |
813 | lttng_live_msg_iter->self_msg_iter, curr_msg); | |
814 | ||
815 | if (status == BT_MSG_ITER_STATUS_ERROR) { | |
816 | live_status = LTTNG_LIVE_ITERATOR_STATUS_ERROR; | |
817 | goto end; | |
818 | } | |
819 | ||
820 | BT_ASSERT(status == BT_MSG_ITER_STATUS_OK); | |
821 | ||
822 | end: | |
823 | return live_status; | |
824 | } | |
825 | ||
7cdc2bab MD |
826 | /* |
827 | * helper function: | |
828 | * handle_no_data_streams() | |
829 | * retry: | |
830 | * - for each ACTIVE_NO_DATA stream: | |
831 | * - query relayd for stream data, or quiescence info. | |
832 | * - if need metadata, get metadata, goto retry. | |
833 | * - if new stream, get new stream as ACTIVE_NO_DATA, goto retry | |
834 | * - if quiescent, move to QUIESCENT streams | |
835 | * - if fetched data, move to ACTIVE_DATA streams | |
836 | * (at this point each stream either has data, or is quiescent) | |
837 | * | |
838 | * | |
839 | * iterator_next: | |
840 | * handle_new_streams_and_metadata() | |
841 | * - query relayd for known streams, add them as ACTIVE_NO_DATA | |
842 | * - query relayd for metadata | |
843 | * | |
844 | * call handle_active_no_data_streams() | |
845 | * | |
846 | * handle_quiescent_streams() | |
847 | * - if at least one stream is ACTIVE_DATA: | |
848 | * - peek stream event with lowest timestamp -> next_ts | |
849 | * - for each quiescent stream | |
850 | * - if next_ts >= quiescent end | |
851 | * - set state to ACTIVE_NO_DATA | |
852 | * - else | |
853 | * - for each quiescent stream | |
854 | * - set state to ACTIVE_NO_DATA | |
855 | * | |
856 | * call handle_active_no_data_streams() | |
857 | * | |
858 | * handle_active_data_streams() | |
859 | * - if at least one stream is ACTIVE_DATA: | |
860 | * - get stream event with lowest timestamp from heap | |
b09a5592 | 861 | * - make that stream event the current message. |
7cdc2bab MD |
862 | * - move this stream heap position to its next event |
863 | * - if we need to fetch data from relayd, move | |
864 | * stream to ACTIVE_NO_DATA. | |
865 | * - return OK | |
866 | * - return AGAIN | |
867 | * | |
868 | * end criterion: ctrl-c on client. If relayd exits or the session | |
869 | * closes on the relay daemon side, we keep on waiting for streams. | |
870 | * Eventually handle --end timestamp (also an end criterion). | |
871 | * | |
872 | * When disconnected from relayd: try to re-connect endlessly. | |
873 | */ | |
874 | static | |
4990894b | 875 | enum lttng_live_iterator_status lttng_live_iterator_next_msg_on_stream( |
bb18709b FD |
876 | struct lttng_live_msg_iter *lttng_live_msg_iter, |
877 | struct lttng_live_stream_iterator *stream_iter, | |
878 | bt_message **curr_msg) | |
7cdc2bab | 879 | { |
1c0ceb65 | 880 | bt_logging_level log_level = lttng_live_msg_iter->log_level; |
5278d5ba | 881 | bt_self_component *self_comp = lttng_live_msg_iter->self_comp; |
bb18709b | 882 | enum lttng_live_iterator_status live_status; |
7cdc2bab | 883 | |
5b337d32 FD |
884 | if (stream_iter->has_stream_hung_up) { |
885 | /* | |
886 | * The stream has hung up and the stream was properly closed | |
887 | * during the last call to the current function. Return _END | |
888 | * status now so that this stream iterator is removed for the | |
889 | * stream iterator list. | |
890 | */ | |
891 | live_status = LTTNG_LIVE_ITERATOR_STATUS_END; | |
892 | goto end; | |
893 | } | |
894 | ||
7cdc2bab MD |
895 | retry: |
896 | print_stream_state(stream_iter); | |
bb18709b FD |
897 | live_status = lttng_live_iterator_handle_new_streams_and_metadata( |
898 | lttng_live_msg_iter); | |
899 | if (live_status != LTTNG_LIVE_ITERATOR_STATUS_OK) { | |
7cdc2bab MD |
900 | goto end; |
901 | } | |
bb18709b FD |
902 | live_status = lttng_live_iterator_next_handle_one_no_data_stream( |
903 | lttng_live_msg_iter, stream_iter); | |
5b337d32 | 904 | |
bb18709b | 905 | if (live_status != LTTNG_LIVE_ITERATOR_STATUS_OK) { |
5b337d32 FD |
906 | if (live_status == LTTNG_LIVE_ITERATOR_STATUS_END) { |
907 | /* | |
908 | * We overwrite `live_status` since `curr_msg` is | |
909 | * likely set to a valid message in this function. | |
910 | */ | |
911 | live_status = lttng_live_iterator_close_stream( | |
912 | lttng_live_msg_iter, stream_iter, curr_msg); | |
913 | } | |
7cdc2bab MD |
914 | goto end; |
915 | } | |
bb18709b FD |
916 | live_status = lttng_live_iterator_next_handle_one_quiescent_stream( |
917 | lttng_live_msg_iter, stream_iter, curr_msg); | |
918 | if (live_status != LTTNG_LIVE_ITERATOR_STATUS_OK) { | |
8e01f2d9 | 919 | BT_ASSERT(!*curr_msg); |
7cdc2bab MD |
920 | goto end; |
921 | } | |
bb18709b | 922 | if (*curr_msg) { |
7cdc2bab MD |
923 | goto end; |
924 | } | |
bb18709b FD |
925 | live_status = lttng_live_iterator_next_handle_one_active_data_stream( |
926 | lttng_live_msg_iter, stream_iter, curr_msg); | |
927 | if (live_status != LTTNG_LIVE_ITERATOR_STATUS_OK) { | |
8e01f2d9 | 928 | BT_ASSERT(!*curr_msg); |
7cdc2bab MD |
929 | } |
930 | ||
931 | end: | |
bb18709b | 932 | if (live_status == LTTNG_LIVE_ITERATOR_STATUS_CONTINUE) { |
7cdc2bab | 933 | goto retry; |
7cdc2bab | 934 | } |
bb18709b FD |
935 | |
936 | return live_status; | |
7cdc2bab MD |
937 | } |
938 | ||
939 | static | |
bb18709b FD |
940 | enum lttng_live_iterator_status next_stream_iterator_for_trace( |
941 | struct lttng_live_msg_iter *lttng_live_msg_iter, | |
942 | struct lttng_live_trace *live_trace, | |
4990894b | 943 | struct lttng_live_stream_iterator **youngest_trace_stream_iter) |
7cdc2bab | 944 | { |
4990894b | 945 | struct lttng_live_stream_iterator *youngest_candidate_stream_iter = NULL; |
bb18709b | 946 | enum lttng_live_iterator_status stream_iter_status;; |
4990894b | 947 | int64_t youngest_candidate_msg_ts = INT64_MAX; |
bb18709b | 948 | uint64_t stream_iter_idx; |
1c0ceb65 | 949 | bt_logging_level log_level = lttng_live_msg_iter->log_level; |
5278d5ba | 950 | bt_self_component *self_comp = lttng_live_msg_iter->self_comp; |
7cdc2bab | 951 | |
bb18709b FD |
952 | BT_ASSERT(live_trace); |
953 | BT_ASSERT(live_trace->stream_iterators); | |
954 | /* | |
955 | * Update the current message of every stream iterators of this trace. | |
956 | * The current msg of every stream must have a timestamp equal or | |
957 | * larger than the last message returned by this iterator. We must | |
958 | * ensure monotonicity. | |
959 | */ | |
960 | stream_iter_idx = 0; | |
961 | while (stream_iter_idx < live_trace->stream_iterators->len) { | |
962 | bool stream_iter_is_ended = false; | |
963 | struct lttng_live_stream_iterator *stream_iter = | |
964 | g_ptr_array_index(live_trace->stream_iterators, | |
965 | stream_iter_idx); | |
966 | ||
51c1eaeb FD |
967 | /* |
968 | * Since we may remove elements from the GPtrArray as we | |
969 | * iterate over it, it's possible to see the same element more | |
970 | * than once. | |
971 | */ | |
4990894b | 972 | if (stream_iter == youngest_candidate_stream_iter) { |
51c1eaeb FD |
973 | stream_iter_idx++; |
974 | continue; | |
975 | } | |
976 | ||
bb18709b FD |
977 | /* |
978 | * Find if there is are now current message for this stream | |
979 | * iterator get it. | |
980 | */ | |
981 | while (!stream_iter->current_msg) { | |
982 | bt_message *msg = NULL; | |
983 | int64_t curr_msg_ts_ns = INT64_MAX; | |
4990894b | 984 | stream_iter_status = lttng_live_iterator_next_msg_on_stream( |
bb18709b FD |
985 | lttng_live_msg_iter, stream_iter, &msg); |
986 | ||
5278d5ba | 987 | BT_COMP_LOGD("live stream iterator returned status :%s", |
bb18709b FD |
988 | print_live_iterator_status(stream_iter_status)); |
989 | if (stream_iter_status == LTTNG_LIVE_ITERATOR_STATUS_END) { | |
990 | stream_iter_is_ended = true; | |
991 | break; | |
992 | } | |
993 | ||
994 | if (stream_iter_status != LTTNG_LIVE_ITERATOR_STATUS_OK) { | |
995 | goto end; | |
996 | } | |
997 | ||
998 | BT_ASSERT(msg); | |
999 | ||
1000 | /* | |
1001 | * Get the timestamp in nanoseconds from origin of this | |
1002 | * messsage. | |
1003 | */ | |
1004 | live_get_msg_ts_ns(stream_iter, lttng_live_msg_iter, | |
1005 | msg, lttng_live_msg_iter->last_msg_ts_ns, | |
1006 | &curr_msg_ts_ns); | |
1007 | ||
1008 | /* | |
1009 | * Check if the message of the current live stream | |
1010 | * iterator occured at the exact same time or after the | |
1011 | * last message returned by this component's message | |
1012 | * iterator. If not, we return an error. | |
1013 | */ | |
1014 | if (curr_msg_ts_ns >= lttng_live_msg_iter->last_msg_ts_ns) { | |
1015 | stream_iter->current_msg = msg; | |
1016 | stream_iter->current_msg_ts_ns = curr_msg_ts_ns; | |
1017 | } else { | |
1018 | /* | |
1019 | * We received a message in the past. To ensure | |
1020 | * monotonicity, we can't send it forward. | |
1021 | */ | |
5278d5ba | 1022 | BT_COMP_LOGE("Message's timestamp is less than " |
bb18709b FD |
1023 | "lttng-live's message iterator's last " |
1024 | "returned timestamp: " | |
1025 | "lttng-live-msg-iter-addr=%p, ts=%" PRId64 ", " | |
1026 | "last-msg-ts=%" PRId64, | |
1027 | lttng_live_msg_iter, curr_msg_ts_ns, | |
1028 | lttng_live_msg_iter->last_msg_ts_ns); | |
1029 | stream_iter_status = LTTNG_LIVE_ITERATOR_STATUS_ERROR; | |
1030 | goto end; | |
1031 | } | |
1032 | } | |
1033 | ||
4990894b | 1034 | BT_ASSERT(stream_iter != youngest_candidate_stream_iter); |
51c1eaeb FD |
1035 | |
1036 | if (!stream_iter_is_ended) { | |
4990894b FD |
1037 | if (G_UNLIKELY(youngest_candidate_stream_iter == NULL) || |
1038 | stream_iter->current_msg_ts_ns < youngest_candidate_msg_ts) { | |
51c1eaeb FD |
1039 | /* |
1040 | * Update the current best candidate message | |
1041 | * for the stream iterator of this live trace | |
1042 | * to be forwarded downstream. | |
1043 | */ | |
4990894b FD |
1044 | youngest_candidate_msg_ts = stream_iter->current_msg_ts_ns; |
1045 | youngest_candidate_stream_iter = stream_iter; | |
1046 | } else if (stream_iter->current_msg_ts_ns == youngest_candidate_msg_ts) { | |
51c1eaeb FD |
1047 | /* |
1048 | * Order the messages in an arbitrary but | |
1049 | * deterministic way. | |
1050 | */ | |
4990894b | 1051 | BT_ASSERT(stream_iter != youngest_candidate_stream_iter); |
51c1eaeb FD |
1052 | int ret = common_muxing_compare_messages( |
1053 | stream_iter->current_msg, | |
4990894b | 1054 | youngest_candidate_stream_iter->current_msg); |
51c1eaeb FD |
1055 | if (ret < 0) { |
1056 | /* | |
4990894b | 1057 | * The `youngest_candidate_stream_iter->current_msg` |
51c1eaeb FD |
1058 | * should go first. Update the next |
1059 | * iterator and the current timestamp. | |
1060 | */ | |
4990894b FD |
1061 | youngest_candidate_msg_ts = stream_iter->current_msg_ts_ns; |
1062 | youngest_candidate_stream_iter = stream_iter; | |
51c1eaeb FD |
1063 | } else if (ret == 0) { |
1064 | /* | |
1065 | * Unable to pick which one should go | |
1066 | * first. | |
1067 | */ | |
1068 | BT_COMP_LOGW("Cannot deterministically pick next live stream message iterator because they have identical next messages: " | |
1069 | "stream-iter-addr=%p" | |
1070 | "stream-iter-addr=%p", | |
1071 | stream_iter, | |
4990894b | 1072 | youngest_candidate_stream_iter); |
51c1eaeb FD |
1073 | } |
1074 | } | |
bb18709b | 1075 | |
51c1eaeb FD |
1076 | stream_iter_idx++; |
1077 | } else { | |
bb18709b FD |
1078 | /* |
1079 | * The live stream iterator is ENDed. We remove that | |
1080 | * iterator from the list and we restart the iteration | |
1081 | * at the beginning of the live stream iterator array | |
1082 | * to because the removal will shuffle the array. | |
1083 | */ | |
1084 | g_ptr_array_remove_index_fast(live_trace->stream_iterators, | |
1085 | stream_iter_idx); | |
1086 | stream_iter_idx = 0; | |
bb18709b FD |
1087 | } |
1088 | } | |
1089 | ||
4990894b FD |
1090 | if (youngest_candidate_stream_iter) { |
1091 | *youngest_trace_stream_iter = youngest_candidate_stream_iter; | |
bb18709b FD |
1092 | stream_iter_status = LTTNG_LIVE_ITERATOR_STATUS_OK; |
1093 | } else { | |
1094 | /* | |
1095 | * The only case where we don't have a candidate for this trace | |
1096 | * is if we reached the end of all the iterators. | |
1097 | */ | |
1098 | BT_ASSERT(live_trace->stream_iterators->len == 0); | |
1099 | stream_iter_status = LTTNG_LIVE_ITERATOR_STATUS_END; | |
1100 | } | |
1101 | ||
1102 | end: | |
1103 | return stream_iter_status; | |
1104 | } | |
1105 | ||
1106 | static | |
1107 | enum lttng_live_iterator_status next_stream_iterator_for_session( | |
1108 | struct lttng_live_msg_iter *lttng_live_msg_iter, | |
1109 | struct lttng_live_session *session, | |
4990894b | 1110 | struct lttng_live_stream_iterator **youngest_session_stream_iter) |
bb18709b | 1111 | { |
51c1eaeb FD |
1112 | bt_self_component *self_comp = lttng_live_msg_iter->self_comp; |
1113 | bt_logging_level log_level = lttng_live_msg_iter->log_level; | |
bb18709b FD |
1114 | enum lttng_live_iterator_status stream_iter_status; |
1115 | uint64_t trace_idx = 0; | |
4990894b FD |
1116 | int64_t youngest_candidate_msg_ts = INT64_MAX; |
1117 | struct lttng_live_stream_iterator *youngest_candidate_stream_iter = NULL; | |
bb18709b FD |
1118 | |
1119 | /* | |
1120 | * Make sure we are attached to the session and look for new streams | |
1121 | * and metadata. | |
1122 | */ | |
1123 | stream_iter_status = lttng_live_get_session(lttng_live_msg_iter, session); | |
1124 | if (stream_iter_status != LTTNG_LIVE_ITERATOR_STATUS_OK && | |
1125 | stream_iter_status != LTTNG_LIVE_ITERATOR_STATUS_CONTINUE && | |
1126 | stream_iter_status != LTTNG_LIVE_ITERATOR_STATUS_END) { | |
7cdc2bab MD |
1127 | goto end; |
1128 | } | |
bb18709b FD |
1129 | |
1130 | BT_ASSERT(session->traces); | |
1131 | ||
1132 | /* | |
1133 | * Use while loops here rather then for loops so we can restart the | |
1134 | * iteration if an element is removed from the array during the | |
1135 | * looping. | |
1136 | */ | |
1137 | while (trace_idx < session->traces->len) { | |
1138 | bool trace_is_ended = false; | |
1139 | struct lttng_live_stream_iterator *stream_iter; | |
1140 | struct lttng_live_trace *trace = | |
1141 | g_ptr_array_index(session->traces, trace_idx); | |
1142 | ||
1143 | stream_iter_status = next_stream_iterator_for_trace( | |
1144 | lttng_live_msg_iter, trace, &stream_iter); | |
1145 | if (stream_iter_status == LTTNG_LIVE_ITERATOR_STATUS_END) { | |
1146 | /* | |
1147 | * All the live stream iterators for this trace are | |
1148 | * ENDed. Remove the trace from this session. | |
1149 | */ | |
1150 | trace_is_ended = true; | |
1151 | } else if (stream_iter_status != LTTNG_LIVE_ITERATOR_STATUS_OK) { | |
1152 | goto end; | |
1153 | } | |
1154 | ||
1155 | if (!trace_is_ended) { | |
1156 | BT_ASSERT(stream_iter); | |
1157 | ||
4990894b FD |
1158 | if (G_UNLIKELY(youngest_candidate_stream_iter == NULL) || |
1159 | stream_iter->current_msg_ts_ns < youngest_candidate_msg_ts) { | |
1160 | youngest_candidate_msg_ts = stream_iter->current_msg_ts_ns; | |
1161 | youngest_candidate_stream_iter = stream_iter; | |
1162 | } else if (stream_iter->current_msg_ts_ns == youngest_candidate_msg_ts) { | |
51c1eaeb FD |
1163 | /* |
1164 | * Order the messages in an arbitrary but | |
1165 | * deterministic way. | |
1166 | */ | |
1167 | int ret = common_muxing_compare_messages( | |
1168 | stream_iter->current_msg, | |
4990894b | 1169 | youngest_candidate_stream_iter->current_msg); |
51c1eaeb FD |
1170 | if (ret < 0) { |
1171 | /* | |
4990894b | 1172 | * The `youngest_candidate_stream_iter->current_msg` |
51c1eaeb FD |
1173 | * should go first. Update the next iterator |
1174 | * and the current timestamp. | |
1175 | */ | |
4990894b FD |
1176 | youngest_candidate_msg_ts = stream_iter->current_msg_ts_ns; |
1177 | youngest_candidate_stream_iter = stream_iter; | |
51c1eaeb FD |
1178 | } else if (ret == 0) { |
1179 | /* Unable to pick which one should go first. */ | |
1180 | BT_COMP_LOGW("Cannot deterministically pick next live stream message iterator because they have identical next messages: " | |
1181 | "stream-iter-addr=%p" "stream-iter-addr=%p", | |
4990894b | 1182 | stream_iter, youngest_candidate_stream_iter); |
51c1eaeb | 1183 | } |
bb18709b FD |
1184 | } |
1185 | trace_idx++; | |
1186 | } else { | |
1187 | g_ptr_array_remove_index_fast(session->traces, trace_idx); | |
1188 | trace_idx = 0; | |
1189 | } | |
1190 | } | |
4990894b FD |
1191 | if (youngest_candidate_stream_iter) { |
1192 | *youngest_session_stream_iter = youngest_candidate_stream_iter; | |
bb18709b | 1193 | stream_iter_status = LTTNG_LIVE_ITERATOR_STATUS_OK; |
7cdc2bab | 1194 | } else { |
bb18709b FD |
1195 | /* |
1196 | * The only cases where we don't have a candidate for this | |
1197 | * trace is: | |
1198 | * 1. if we reached the end of all the iterators of all the | |
1199 | * traces of this session, | |
1200 | * 2. if we never had live stream iterator in the first place. | |
1201 | * | |
1202 | * In either cases, we return END. | |
1203 | */ | |
1204 | BT_ASSERT(session->traces->len == 0); | |
1205 | stream_iter_status = LTTNG_LIVE_ITERATOR_STATUS_END; | |
7cdc2bab MD |
1206 | } |
1207 | end: | |
bb18709b FD |
1208 | return stream_iter_status; |
1209 | } | |
1210 | ||
1211 | static inline | |
1212 | void put_messages(bt_message_array_const msgs, uint64_t count) | |
1213 | { | |
1214 | uint64_t i; | |
1215 | ||
1216 | for (i = 0; i < count; i++) { | |
1217 | BT_MESSAGE_PUT_REF_AND_RESET(msgs[i]); | |
7cdc2bab | 1218 | } |
7cdc2bab MD |
1219 | } |
1220 | ||
d3eb6e8f | 1221 | BT_HIDDEN |
fb25b9e3 | 1222 | bt_component_class_message_iterator_next_method_status lttng_live_msg_iter_next( |
bb18709b FD |
1223 | bt_self_message_iterator *self_msg_it, |
1224 | bt_message_array_const msgs, uint64_t capacity, | |
1225 | uint64_t *count) | |
d3eb6e8f | 1226 | { |
fb25b9e3 | 1227 | bt_component_class_message_iterator_next_method_status status; |
bb18709b FD |
1228 | struct lttng_live_msg_iter *lttng_live_msg_iter = |
1229 | bt_self_message_iterator_get_data(self_msg_it); | |
1230 | struct lttng_live_component *lttng_live = | |
1231 | lttng_live_msg_iter->lttng_live_comp; | |
eb8cbb9e FD |
1232 | bt_self_component *self_comp = lttng_live_msg_iter->self_comp; |
1233 | bt_logging_level log_level = lttng_live_msg_iter->log_level; | |
bb18709b FD |
1234 | enum lttng_live_iterator_status stream_iter_status; |
1235 | uint64_t session_idx; | |
1236 | ||
1237 | *count = 0; | |
1238 | ||
1239 | BT_ASSERT(lttng_live_msg_iter); | |
1240 | ||
1241 | /* | |
1242 | * Clear all the invalid message reference that might be left over in | |
1243 | * the output array. | |
1244 | */ | |
1245 | memset(msgs, 0, capacity * sizeof(*msgs)); | |
1246 | ||
1247 | /* | |
1248 | * If no session are exposed on the relay found at the url provided by | |
1249 | * the user, session count will be 0. In this case, we return status | |
1250 | * end to return gracefully. | |
1251 | */ | |
1252 | if (lttng_live_msg_iter->sessions->len == 0) { | |
1253 | if (lttng_live->params.sess_not_found_act != | |
1254 | SESSION_NOT_FOUND_ACTION_CONTINUE) { | |
fb25b9e3 | 1255 | status = BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_END; |
bb18709b FD |
1256 | goto no_session; |
1257 | } else { | |
1258 | /* | |
1259 | * The are no more active session for this session | |
1260 | * name. Retry to create a viewer session for the | |
1261 | * requested session name. | |
1262 | */ | |
1263 | if (lttng_live_create_viewer_session(lttng_live_msg_iter)) { | |
fb25b9e3 | 1264 | status = BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_ERROR; |
bb18709b FD |
1265 | goto no_session; |
1266 | } | |
1267 | } | |
1268 | } | |
1269 | ||
1270 | if (lttng_live_msg_iter->active_stream_iter == 0) { | |
1271 | lttng_live_force_new_streams_and_metadata(lttng_live_msg_iter); | |
1272 | } | |
1273 | ||
1274 | /* | |
1275 | * Here the muxing of message is done. | |
1276 | * | |
1277 | * We need to iterate over all the streams of all the traces of all the | |
1278 | * viewer sessions in order to get the message with the smallest | |
1279 | * timestamp. In this case, a session is a viewer session and there is | |
1280 | * one viewer session per consumer daemon. (UST 32bit, UST 64bit and/or | |
1281 | * kernel). Each viewer session can have multiple traces, for example, | |
1282 | * 64bit UST viewer sessions could have multiple per-pid traces. | |
1283 | * | |
1284 | * We iterate over the streams of each traces to update and see what is | |
1285 | * their next message's timestamp. From those timestamps, we select the | |
1286 | * message with the smallest timestamp as the best candidate message | |
1287 | * for that trace and do the same thing across all the sessions. | |
1288 | * | |
1289 | * We then compare the timestamp of best candidate message of all the | |
1290 | * sessions to pick the message with the smallest timestamp and we | |
1291 | * return it. | |
1292 | */ | |
1293 | while (*count < capacity) { | |
4990894b FD |
1294 | struct lttng_live_stream_iterator *youngest_stream_iter = NULL, |
1295 | *candidate_stream_iter = NULL; | |
1296 | int64_t youngest_msg_ts_ns = INT64_MAX; | |
bb18709b FD |
1297 | |
1298 | BT_ASSERT(lttng_live_msg_iter->sessions); | |
1299 | session_idx = 0; | |
1300 | /* | |
1301 | * Use a while loop instead of a for loop so we can restart the | |
1302 | * iteration if we remove an element. We can safely call | |
1303 | * next_stream_iterator_for_session() multiple times on the | |
1304 | * same session as we only fetch a new message if there is no | |
1305 | * current next message for each live stream iterator. | |
1306 | * If all live stream iterator of that session already have a | |
1307 | * current next message, the function will simply exit return | |
1308 | * the same candidate live stream iterator every time. | |
1309 | */ | |
1310 | while (session_idx < lttng_live_msg_iter->sessions->len) { | |
1311 | struct lttng_live_session *session = | |
1312 | g_ptr_array_index(lttng_live_msg_iter->sessions, | |
1313 | session_idx); | |
1314 | ||
1315 | /* Find the best candidate message to send downstream. */ | |
1316 | stream_iter_status = next_stream_iterator_for_session( | |
1317 | lttng_live_msg_iter, session, | |
1318 | &candidate_stream_iter); | |
1319 | ||
1320 | /* If we receive an END status, it means that either: | |
1321 | * - Those traces never had active streams (UST with no | |
1322 | * data produced yet), | |
1323 | * - All live stream iterators have ENDed.*/ | |
1324 | if (stream_iter_status == LTTNG_LIVE_ITERATOR_STATUS_END) { | |
1325 | if (session->closed && session->traces->len == 0) { | |
1326 | /* | |
1327 | * Remove the session from the list and restart the | |
1328 | * iteration at the beginning of the array since the | |
1329 | * removal shuffle the elements of the array. | |
1330 | */ | |
1331 | g_ptr_array_remove_index_fast( | |
1332 | lttng_live_msg_iter->sessions, | |
1333 | session_idx); | |
1334 | session_idx = 0; | |
1335 | } else { | |
1336 | session_idx++; | |
1337 | } | |
1338 | continue; | |
1339 | } | |
1340 | ||
1341 | if (stream_iter_status != LTTNG_LIVE_ITERATOR_STATUS_OK) { | |
1342 | goto end; | |
1343 | } | |
1344 | ||
4990894b FD |
1345 | if (G_UNLIKELY(youngest_stream_iter == NULL) || |
1346 | candidate_stream_iter->current_msg_ts_ns <= youngest_msg_ts_ns) { | |
1347 | youngest_msg_ts_ns = candidate_stream_iter->current_msg_ts_ns; | |
1348 | youngest_stream_iter = candidate_stream_iter; | |
1349 | } else if (candidate_stream_iter->current_msg_ts_ns == youngest_msg_ts_ns) { | |
eb8cbb9e FD |
1350 | /* |
1351 | * The currently selected message to be sent | |
1352 | * downstream next has the exact same timestamp | |
1353 | * that of the current candidate message. We | |
1354 | * must break the tie in a predictable manner. | |
1355 | */ | |
1356 | BT_COMP_LOGD_STR("Two of the next message candidates have the same timestamps, pick one deterministically."); | |
1357 | /* | |
1358 | * Order the messages in an arbitrary but | |
51c1eaeb | 1359 | * deterministic way. |
eb8cbb9e | 1360 | */ |
51c1eaeb FD |
1361 | int ret = common_muxing_compare_messages( |
1362 | candidate_stream_iter->current_msg, | |
4990894b | 1363 | youngest_stream_iter->current_msg); |
eb8cbb9e FD |
1364 | if (ret < 0) { |
1365 | /* | |
1366 | * The `candidate_stream_iter->current_msg` | |
1367 | * should go first. Update the next | |
1368 | * iterator and the current timestamp. | |
1369 | */ | |
4990894b FD |
1370 | youngest_msg_ts_ns = candidate_stream_iter->current_msg_ts_ns; |
1371 | youngest_stream_iter = candidate_stream_iter; | |
eb8cbb9e FD |
1372 | } else if (ret == 0) { |
1373 | /* Unable to pick which one should go first. */ | |
1374 | BT_COMP_LOGW("Cannot deterministically pick next live stream message iterator because they have identical next messages: " | |
1375 | "next-stream-iter-addr=%p" "candidate-stream-iter-addr=%p", | |
4990894b | 1376 | youngest_stream_iter, candidate_stream_iter); |
eb8cbb9e | 1377 | } |
bb18709b FD |
1378 | } |
1379 | ||
1380 | session_idx++; | |
1381 | } | |
1382 | ||
4990894b | 1383 | if (!youngest_stream_iter) { |
bb18709b FD |
1384 | stream_iter_status = LTTNG_LIVE_ITERATOR_STATUS_AGAIN; |
1385 | goto end; | |
1386 | } | |
1387 | ||
4990894b | 1388 | BT_ASSERT(youngest_stream_iter->current_msg); |
bb18709b FD |
1389 | /* Ensure monotonicity. */ |
1390 | BT_ASSERT(lttng_live_msg_iter->last_msg_ts_ns <= | |
4990894b | 1391 | youngest_stream_iter->current_msg_ts_ns); |
bb18709b FD |
1392 | |
1393 | /* | |
1394 | * Insert the next message to the message batch. This will set | |
1395 | * stream iterator current messsage to NULL so that next time | |
1396 | * we fetch the next message of that stream iterator | |
1397 | */ | |
4990894b | 1398 | BT_MESSAGE_MOVE_REF(msgs[*count], youngest_stream_iter->current_msg); |
bb18709b FD |
1399 | (*count)++; |
1400 | ||
1401 | /* Update the last timestamp in nanoseconds sent downstream. */ | |
4990894b FD |
1402 | lttng_live_msg_iter->last_msg_ts_ns = youngest_msg_ts_ns; |
1403 | youngest_stream_iter->current_msg_ts_ns = INT64_MAX; | |
bb18709b FD |
1404 | |
1405 | stream_iter_status = LTTNG_LIVE_ITERATOR_STATUS_OK; | |
1406 | } | |
1407 | end: | |
1408 | switch (stream_iter_status) { | |
1409 | case LTTNG_LIVE_ITERATOR_STATUS_OK: | |
1410 | case LTTNG_LIVE_ITERATOR_STATUS_AGAIN: | |
1411 | if (*count > 0) { | |
1412 | /* | |
1413 | * We received a again status but we have some messages | |
1414 | * to send downstream. We send them and return OK for | |
1415 | * now. On the next call we return again if there are | |
1416 | * still no new message to send. | |
1417 | */ | |
fb25b9e3 | 1418 | status = BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_OK; |
bb18709b | 1419 | } else { |
fb25b9e3 | 1420 | status = BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_AGAIN; |
bb18709b | 1421 | } |
7cdc2bab | 1422 | break; |
bb18709b | 1423 | case LTTNG_LIVE_ITERATOR_STATUS_END: |
fb25b9e3 | 1424 | status = BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_END; |
7cdc2bab | 1425 | break; |
bb18709b | 1426 | case LTTNG_LIVE_ITERATOR_STATUS_NOMEM: |
fb25b9e3 | 1427 | status = BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_MEMORY_ERROR; |
bb18709b FD |
1428 | break; |
1429 | case LTTNG_LIVE_ITERATOR_STATUS_ERROR: | |
1430 | case LTTNG_LIVE_ITERATOR_STATUS_INVAL: | |
1431 | case LTTNG_LIVE_ITERATOR_STATUS_UNSUPPORTED: | |
fb25b9e3 | 1432 | status = BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_ERROR; |
bb18709b FD |
1433 | /* Put all existing messages on error. */ |
1434 | put_messages(msgs, *count); | |
7cdc2bab | 1435 | break; |
bb18709b FD |
1436 | default: |
1437 | abort(); | |
7cdc2bab | 1438 | } |
bb18709b FD |
1439 | |
1440 | no_session: | |
1441 | return status; | |
7cdc2bab | 1442 | } |
41a2b7ae | 1443 | |
7cdc2bab | 1444 | BT_HIDDEN |
fb25b9e3 | 1445 | bt_component_class_message_iterator_init_method_status lttng_live_msg_iter_init( |
bb18709b FD |
1446 | bt_self_message_iterator *self_msg_it, |
1447 | bt_self_component_source *self_comp_src, | |
1448 | bt_self_component_port_output *self_port) | |
7cdc2bab | 1449 | { |
fb25b9e3 PP |
1450 | bt_component_class_message_iterator_init_method_status ret = |
1451 | BT_COMPONENT_CLASS_MESSAGE_ITERATOR_INIT_METHOD_STATUS_OK; | |
bb18709b | 1452 | bt_self_component *self_comp = |
fb25b9e3 | 1453 | bt_self_component_source_as_self_component(self_comp_src); |
bb18709b FD |
1454 | struct lttng_live_component *lttng_live; |
1455 | struct lttng_live_msg_iter *lttng_live_msg_iter; | |
1c0ceb65 | 1456 | bt_logging_level log_level; |
bb18709b FD |
1457 | |
1458 | BT_ASSERT(self_msg_it); | |
1459 | ||
1460 | lttng_live = bt_self_component_get_data(self_comp); | |
1c0ceb65 | 1461 | log_level = lttng_live->log_level; |
5278d5ba | 1462 | self_comp = lttng_live->self_comp; |
bb18709b FD |
1463 | |
1464 | /* There can be only one downstream iterator at the same time. */ | |
1465 | BT_ASSERT(!lttng_live->has_msg_iter); | |
1466 | lttng_live->has_msg_iter = true; | |
1467 | ||
1468 | lttng_live_msg_iter = g_new0(struct lttng_live_msg_iter, 1); | |
1469 | if (!lttng_live_msg_iter) { | |
fb25b9e3 | 1470 | ret = BT_COMPONENT_CLASS_MESSAGE_ITERATOR_INIT_METHOD_STATUS_ERROR; |
bb18709b | 1471 | goto end; |
7cdc2bab | 1472 | } |
bb18709b | 1473 | |
1c0ceb65 | 1474 | lttng_live_msg_iter->log_level = lttng_live->log_level; |
5278d5ba | 1475 | lttng_live_msg_iter->self_comp = lttng_live->self_comp; |
bb18709b FD |
1476 | lttng_live_msg_iter->lttng_live_comp = lttng_live; |
1477 | lttng_live_msg_iter->self_msg_iter = self_msg_it; | |
1478 | ||
1479 | lttng_live_msg_iter->active_stream_iter = 0; | |
1480 | lttng_live_msg_iter->last_msg_ts_ns = INT64_MIN; | |
1481 | lttng_live_msg_iter->sessions = g_ptr_array_new_with_free_func( | |
1482 | (GDestroyNotify) lttng_live_destroy_session); | |
1483 | BT_ASSERT(lttng_live_msg_iter->sessions); | |
1484 | ||
1485 | lttng_live_msg_iter->viewer_connection = | |
1486 | live_viewer_connection_create(lttng_live->params.url->str, false, | |
ca06281d | 1487 | lttng_live_msg_iter, log_level); |
bb18709b FD |
1488 | if (!lttng_live_msg_iter->viewer_connection) { |
1489 | goto error; | |
1490 | } | |
1491 | ||
1492 | if (lttng_live_create_viewer_session(lttng_live_msg_iter)) { | |
1493 | goto error; | |
1494 | } | |
1495 | if (lttng_live_msg_iter->sessions->len == 0) { | |
1496 | switch (lttng_live->params.sess_not_found_act) { | |
1497 | case SESSION_NOT_FOUND_ACTION_CONTINUE: | |
5278d5ba | 1498 | BT_COMP_LOGI("Unable to connect to the requested live viewer " |
bb18709b FD |
1499 | "session. Keep trying to connect because of " |
1500 | "%s=\"%s\" component parameter: url=\"%s\"", | |
1501 | SESS_NOT_FOUND_ACTION_PARAM, | |
1502 | SESS_NOT_FOUND_ACTION_CONTINUE_STR, | |
1503 | lttng_live->params.url->str); | |
1504 | break; | |
1505 | case SESSION_NOT_FOUND_ACTION_FAIL: | |
5278d5ba | 1506 | BT_COMP_LOGE("Unable to connect to the requested live viewer " |
bb18709b FD |
1507 | "session. Fail the message iterator" |
1508 | "initialization because of %s=\"%s\" " | |
1509 | "component parameter: url =\"%s\"", | |
1510 | SESS_NOT_FOUND_ACTION_PARAM, | |
1511 | SESS_NOT_FOUND_ACTION_FAIL_STR, | |
1512 | lttng_live->params.url->str); | |
7cdc2bab | 1513 | goto error; |
bb18709b | 1514 | case SESSION_NOT_FOUND_ACTION_END: |
5278d5ba | 1515 | BT_COMP_LOGI("Unable to connect to the requested live viewer " |
bb18709b FD |
1516 | "session. End gracefully at the first _next() " |
1517 | "call because of %s=\"%s\" component parameter: " | |
1518 | "url=\"%s\"", SESS_NOT_FOUND_ACTION_PARAM, | |
1519 | SESS_NOT_FOUND_ACTION_END_STR, | |
1520 | lttng_live->params.url->str); | |
1521 | break; | |
369d1e21 JR |
1522 | case SESSION_NOT_FOUND_ACTION_UNKNOWN: |
1523 | default: | |
1524 | /* Fallthrough */ | |
1525 | BT_COMP_LOGE("Unknown action for session not found" | |
1526 | "error. Fail the message iterator" | |
1527 | "initialization because of %s=\"%s\" " | |
1528 | "component parameter: url =\"%s\"", | |
1529 | SESS_NOT_FOUND_ACTION_PARAM, | |
1530 | SESS_NOT_FOUND_ACTION_FAIL_STR, | |
1531 | lttng_live->params.url->str); | |
1532 | break; | |
7cdc2bab | 1533 | } |
7cdc2bab MD |
1534 | } |
1535 | ||
bb18709b FD |
1536 | bt_self_message_iterator_set_data(self_msg_it, lttng_live_msg_iter); |
1537 | ||
1538 | goto end; | |
1539 | error: | |
fb25b9e3 | 1540 | ret = BT_COMPONENT_CLASS_MESSAGE_ITERATOR_INIT_METHOD_STATUS_ERROR; |
bb18709b | 1541 | lttng_live_msg_iter_destroy(lttng_live_msg_iter); |
7cdc2bab | 1542 | end: |
41a2b7ae | 1543 | return ret; |
7cdc2bab MD |
1544 | } |
1545 | ||
1546 | static | |
fb25b9e3 PP |
1547 | bt_component_class_query_method_status lttng_live_query_list_sessions( |
1548 | const bt_value *params, const bt_value **result, | |
1549 | bt_logging_level log_level) | |
7cdc2bab | 1550 | { |
fb25b9e3 PP |
1551 | bt_component_class_query_method_status status = |
1552 | BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_OK; | |
bb18709b | 1553 | const bt_value *url_value = NULL; |
7cdc2bab | 1554 | const char *url; |
bb18709b | 1555 | struct live_viewer_connection *viewer_connection = NULL; |
5278d5ba | 1556 | bt_self_component *self_comp = NULL; |
7cdc2bab | 1557 | |
bb18709b FD |
1558 | url_value = bt_value_map_borrow_entry_value_const(params, URL_PARAM); |
1559 | if (!url_value) { | |
574dea68 SM |
1560 | BT_COMP_LOGE("Mandatory `%s` parameter missing", URL_PARAM); |
1561 | status = BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_ERROR; | |
7cdc2bab MD |
1562 | goto error; |
1563 | } | |
1564 | ||
bb18709b | 1565 | if (!bt_value_is_string(url_value)) { |
574dea68 | 1566 | BT_COMP_LOGE("`%s` parameter is required to be a string value", |
bb18709b | 1567 | URL_PARAM); |
574dea68 | 1568 | status = BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_ERROR; |
7cdc2bab MD |
1569 | goto error; |
1570 | } | |
1571 | ||
bb18709b FD |
1572 | url = bt_value_string_get(url_value); |
1573 | ||
ca06281d PP |
1574 | viewer_connection = live_viewer_connection_create(url, true, NULL, |
1575 | log_level); | |
7cdc2bab | 1576 | if (!viewer_connection) { |
7cdc2bab MD |
1577 | goto error; |
1578 | } | |
1579 | ||
bb18709b FD |
1580 | status = live_viewer_connection_list_sessions(viewer_connection, |
1581 | result); | |
fb25b9e3 | 1582 | if (status != BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_OK) { |
1286dcbb PP |
1583 | goto error; |
1584 | } | |
1585 | ||
7cdc2bab | 1586 | goto end; |
1286dcbb | 1587 | |
7cdc2bab | 1588 | error: |
bb18709b | 1589 | BT_VALUE_PUT_REF_AND_RESET(*result); |
1286dcbb | 1590 | |
bb18709b | 1591 | if (status >= 0) { |
fb25b9e3 | 1592 | status = BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_ERROR; |
1286dcbb PP |
1593 | } |
1594 | ||
7cdc2bab MD |
1595 | end: |
1596 | if (viewer_connection) { | |
bb18709b | 1597 | live_viewer_connection_destroy(viewer_connection); |
7cdc2bab | 1598 | } |
bb18709b | 1599 | return status; |
7cdc2bab MD |
1600 | } |
1601 | ||
1602 | BT_HIDDEN | |
fb25b9e3 PP |
1603 | bt_component_class_query_method_status lttng_live_query( |
1604 | bt_self_component_class_source *comp_class, | |
bf403eb2 | 1605 | bt_private_query_executor *priv_query_exec, |
bb18709b | 1606 | const char *object, const bt_value *params, |
f6e305ce | 1607 | __attribute__((unused)) void *method_data, |
bf403eb2 | 1608 | const bt_value **result) |
7cdc2bab | 1609 | { |
fb25b9e3 PP |
1610 | bt_component_class_query_method_status status = |
1611 | BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_OK; | |
5278d5ba | 1612 | bt_self_component *self_comp = NULL; |
bf403eb2 PP |
1613 | bt_logging_level log_level = bt_query_executor_get_logging_level( |
1614 | bt_private_query_executor_as_query_executor_const( | |
1615 | priv_query_exec)); | |
1286dcbb | 1616 | |
7cdc2bab | 1617 | if (strcmp(object, "sessions") == 0) { |
1c0ceb65 PP |
1618 | status = lttng_live_query_list_sessions(params, result, |
1619 | log_level); | |
bb18709b | 1620 | } else { |
287eb741 | 1621 | BT_COMP_LOGI("Unknown query object `%s`", object); |
7dd3e712 | 1622 | status = BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_UNKNOWN_OBJECT; |
bb18709b | 1623 | goto end; |
7cdc2bab | 1624 | } |
bb18709b FD |
1625 | |
1626 | end: | |
1627 | return status; | |
7cdc2bab MD |
1628 | } |
1629 | ||
1630 | static | |
1631 | void lttng_live_component_destroy_data(struct lttng_live_component *lttng_live) | |
1632 | { | |
059e3940 FD |
1633 | if (!lttng_live) { |
1634 | return; | |
1635 | } | |
bb18709b FD |
1636 | if (lttng_live->params.url) { |
1637 | g_string_free(lttng_live->params.url, TRUE); | |
7cdc2bab MD |
1638 | } |
1639 | g_free(lttng_live); | |
1640 | } | |
1641 | ||
1642 | BT_HIDDEN | |
bb18709b | 1643 | void lttng_live_component_finalize(bt_self_component_source *component) |
7cdc2bab | 1644 | { |
bb18709b FD |
1645 | void *data = bt_self_component_get_data( |
1646 | bt_self_component_source_as_self_component(component)); | |
7cdc2bab MD |
1647 | |
1648 | if (!data) { | |
1649 | return; | |
1650 | } | |
1651 | lttng_live_component_destroy_data(data); | |
1652 | } | |
1653 | ||
1654 | static | |
bb18709b FD |
1655 | enum session_not_found_action parse_session_not_found_action_param( |
1656 | const bt_value *no_session_param) | |
1657 | { | |
1658 | enum session_not_found_action action; | |
1659 | const char *no_session_act_str; | |
1660 | no_session_act_str = bt_value_string_get(no_session_param); | |
1661 | if (strcmp(no_session_act_str, SESS_NOT_FOUND_ACTION_CONTINUE_STR) == 0) { | |
1662 | action = SESSION_NOT_FOUND_ACTION_CONTINUE; | |
1663 | } else if (strcmp(no_session_act_str, SESS_NOT_FOUND_ACTION_FAIL_STR) == 0) { | |
1664 | action = SESSION_NOT_FOUND_ACTION_FAIL; | |
1665 | } else if (strcmp(no_session_act_str, SESS_NOT_FOUND_ACTION_END_STR) == 0) { | |
1666 | action = SESSION_NOT_FOUND_ACTION_END; | |
1667 | } else { | |
369d1e21 | 1668 | action = SESSION_NOT_FOUND_ACTION_UNKNOWN; |
bb18709b FD |
1669 | } |
1670 | ||
1671 | return action; | |
1672 | } | |
1673 | ||
1c0ceb65 | 1674 | struct lttng_live_component *lttng_live_component_create(const bt_value *params, |
5278d5ba | 1675 | bt_logging_level log_level, bt_self_component *self_comp) |
7cdc2bab MD |
1676 | { |
1677 | struct lttng_live_component *lttng_live; | |
bb18709b | 1678 | const bt_value *value = NULL; |
7cdc2bab | 1679 | const char *url; |
7cdc2bab MD |
1680 | |
1681 | lttng_live = g_new0(struct lttng_live_component, 1); | |
1682 | if (!lttng_live) { | |
1683 | goto end; | |
1684 | } | |
1c0ceb65 | 1685 | lttng_live->log_level = log_level; |
5278d5ba | 1686 | lttng_live->self_comp = self_comp; |
7cdc2bab | 1687 | lttng_live->max_query_size = MAX_QUERY_SIZE; |
bb18709b FD |
1688 | lttng_live->has_msg_iter = false; |
1689 | ||
1690 | value = bt_value_map_borrow_entry_value_const(params, URL_PARAM); | |
1691 | if (!value || !bt_value_is_string(value)) { | |
5278d5ba | 1692 | BT_COMP_LOGW("Mandatory `%s` parameter missing or not a string", |
bb18709b | 1693 | URL_PARAM); |
7cdc2bab MD |
1694 | goto error; |
1695 | } | |
b5cdc106 | 1696 | url = bt_value_string_get(value); |
bb18709b FD |
1697 | lttng_live->params.url = g_string_new(url); |
1698 | if (!lttng_live->params.url) { | |
7cdc2bab MD |
1699 | goto error; |
1700 | } | |
bb18709b FD |
1701 | |
1702 | value = bt_value_map_borrow_entry_value_const(params, | |
1703 | SESS_NOT_FOUND_ACTION_PARAM); | |
1704 | ||
1705 | if (value && bt_value_is_string(value)) { | |
1706 | lttng_live->params.sess_not_found_act = | |
1707 | parse_session_not_found_action_param(value); | |
369d1e21 | 1708 | if (lttng_live->params.sess_not_found_act == SESSION_NOT_FOUND_ACTION_UNKNOWN) { |
5278d5ba | 1709 | BT_COMP_LOGE("Unexpected value for `%s` parameter: " |
bb18709b FD |
1710 | "value=\"%s\"", SESS_NOT_FOUND_ACTION_PARAM, |
1711 | bt_value_string_get(value)); | |
1712 | goto error; | |
1713 | } | |
1714 | } else { | |
5278d5ba | 1715 | BT_COMP_LOGW("Optional `%s` parameter is missing or " |
bb18709b FD |
1716 | "not a string value. Defaulting to %s=\"%s\".", |
1717 | SESS_NOT_FOUND_ACTION_PARAM, | |
1718 | SESS_NOT_FOUND_ACTION_PARAM, | |
1719 | SESS_NOT_FOUND_ACTION_CONTINUE_STR); | |
1720 | lttng_live->params.sess_not_found_act = | |
1721 | SESSION_NOT_FOUND_ACTION_CONTINUE; | |
7cdc2bab | 1722 | } |
4c66436f | 1723 | |
7cdc2bab MD |
1724 | goto end; |
1725 | ||
1726 | error: | |
1727 | lttng_live_component_destroy_data(lttng_live); | |
1728 | lttng_live = NULL; | |
1729 | end: | |
1730 | return lttng_live; | |
d3e4dcd8 PP |
1731 | } |
1732 | ||
f3bc2010 | 1733 | BT_HIDDEN |
fb25b9e3 | 1734 | bt_component_class_init_method_status lttng_live_component_init( |
1c0ceb65 | 1735 | bt_self_component_source *self_comp_src, |
f807570c | 1736 | const bt_value *params, __attribute__((unused)) void *init_method_data) |
f3bc2010 | 1737 | { |
7cdc2bab | 1738 | struct lttng_live_component *lttng_live; |
fb25b9e3 PP |
1739 | bt_component_class_init_method_status ret = |
1740 | BT_COMPONENT_CLASS_INIT_METHOD_STATUS_OK; | |
1c0ceb65 PP |
1741 | bt_self_component *self_comp = |
1742 | bt_self_component_source_as_self_component(self_comp_src); | |
1743 | bt_logging_level log_level = bt_component_get_logging_level( | |
1744 | bt_self_component_as_component(self_comp)); | |
fb25b9e3 | 1745 | bt_self_component_add_port_status add_port_status; |
7cdc2bab | 1746 | |
5278d5ba | 1747 | lttng_live = lttng_live_component_create(params, log_level, self_comp); |
7cdc2bab | 1748 | if (!lttng_live) { |
fb25b9e3 | 1749 | ret = BT_COMPONENT_CLASS_INIT_METHOD_STATUS_MEMORY_ERROR; |
059e3940 | 1750 | goto error; |
7cdc2bab MD |
1751 | } |
1752 | ||
fb25b9e3 PP |
1753 | add_port_status = bt_self_component_source_add_output_port( |
1754 | self_comp_src, "out", NULL, NULL); | |
1755 | switch (add_port_status) { | |
1756 | case BT_SELF_COMPONENT_ADD_PORT_STATUS_ERROR: | |
1757 | ret = BT_COMPONENT_CLASS_INIT_METHOD_STATUS_ERROR; | |
1758 | goto error; | |
1759 | case BT_SELF_COMPONENT_ADD_PORT_STATUS_MEMORY_ERROR: | |
1760 | ret = BT_COMPONENT_CLASS_INIT_METHOD_STATUS_MEMORY_ERROR; | |
059e3940 | 1761 | goto error; |
fb25b9e3 PP |
1762 | default: |
1763 | break; | |
147337a3 | 1764 | } |
7cdc2bab | 1765 | |
1c0ceb65 | 1766 | bt_self_component_set_data(self_comp, lttng_live); |
059e3940 | 1767 | goto end; |
7cdc2bab | 1768 | |
059e3940 FD |
1769 | error: |
1770 | lttng_live_component_destroy_data(lttng_live); | |
1771 | lttng_live = NULL; | |
7cdc2bab MD |
1772 | end: |
1773 | return ret; | |
d85ef162 | 1774 | } |