Commit | Line | Data |
---|---|---|
f3bc2010 | 1 | /* |
0235b0db | 2 | * SPDX-License-Identifier: MIT |
f3bc2010 | 3 | * |
14f28187 | 4 | * Copyright 2019 Francis Deslauriers <francis.deslauriers@efficios.com> |
f3bc2010 | 5 | * Copyright 2016 Jérémie Galarneau <jeremie.galarneau@efficios.com> |
7cdc2bab | 6 | * Copyright 2016 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
f3bc2010 | 7 | * |
0235b0db | 8 | * Babeltrace CTF LTTng-live Client Component |
f3bc2010 JG |
9 | */ |
10 | ||
2ece7dd0 | 11 | #define BT_COMP_LOG_SELF_COMP self_comp |
4164020e SM |
12 | #define BT_LOG_OUTPUT_LEVEL log_level |
13 | #define BT_LOG_TAG "PLUGIN/SRC.CTF.LTTNG-LIVE" | |
d9c39b0a | 14 | #include "logging/comp-logging.h" |
020bc26f | 15 | |
14f28187 | 16 | #include <inttypes.h> |
c4f23e30 | 17 | #include <stdbool.h> |
14f28187 FD |
18 | #include <unistd.h> |
19 | ||
3c22a242 FD |
20 | #include <glib.h> |
21 | ||
578e048b | 22 | #include "common/assert.h" |
3fadfbc0 | 23 | #include <babeltrace2/babeltrace.h> |
578e048b | 24 | #include "compat/compiler.h" |
3fadfbc0 | 25 | #include <babeltrace2/types.h> |
f3bc2010 | 26 | |
376fc2bd | 27 | #include "plugins/common/muxing/muxing.h" |
80aff5ef | 28 | #include "plugins/common/param-validation/param-validation.h" |
376fc2bd | 29 | |
087cd0f5 SM |
30 | #include "data-stream.hpp" |
31 | #include "metadata.hpp" | |
32 | #include "lttng-live.hpp" | |
7cdc2bab | 33 | |
4164020e SM |
34 | #define MAX_QUERY_SIZE (256 * 1024) |
35 | #define URL_PARAM "url" | |
36 | #define INPUTS_PARAM "inputs" | |
37 | #define SESS_NOT_FOUND_ACTION_PARAM "session-not-found-action" | |
38 | #define SESS_NOT_FOUND_ACTION_CONTINUE_STR "continue" | |
39 | #define SESS_NOT_FOUND_ACTION_FAIL_STR "fail" | |
40 | #define SESS_NOT_FOUND_ACTION_END_STR "end" | |
7cdc2bab | 41 | |
4164020e | 42 | #define print_dbg(fmt, ...) BT_COMP_LOGD(fmt, ##__VA_ARGS__) |
7cdc2bab | 43 | |
4164020e | 44 | static const char *lttng_live_iterator_status_string(enum lttng_live_iterator_status status) |
14f28187 | 45 | { |
4164020e SM |
46 | switch (status) { |
47 | case LTTNG_LIVE_ITERATOR_STATUS_CONTINUE: | |
48 | return "LTTNG_LIVE_ITERATOR_STATUS_CONTINUE"; | |
49 | case LTTNG_LIVE_ITERATOR_STATUS_AGAIN: | |
50 | return "LTTNG_LIVE_ITERATOR_STATUS_AGAIN"; | |
51 | case LTTNG_LIVE_ITERATOR_STATUS_END: | |
52 | return "LTTNG_LIVE_ITERATOR_STATUS_END"; | |
53 | case LTTNG_LIVE_ITERATOR_STATUS_OK: | |
54 | return "LTTNG_LIVE_ITERATOR_STATUS_OK"; | |
55 | case LTTNG_LIVE_ITERATOR_STATUS_INVAL: | |
56 | return "LTTNG_LIVE_ITERATOR_STATUS_INVAL"; | |
57 | case LTTNG_LIVE_ITERATOR_STATUS_ERROR: | |
58 | return "LTTNG_LIVE_ITERATOR_STATUS_ERROR"; | |
59 | case LTTNG_LIVE_ITERATOR_STATUS_NOMEM: | |
60 | return "LTTNG_LIVE_ITERATOR_STATUS_NOMEM"; | |
61 | case LTTNG_LIVE_ITERATOR_STATUS_UNSUPPORTED: | |
62 | return "LTTNG_LIVE_ITERATOR_STATUS_UNSUPPORTED"; | |
63 | default: | |
64 | bt_common_abort(); | |
65 | } | |
14f28187 FD |
66 | } |
67 | ||
4164020e | 68 | static const char *lttng_live_stream_state_string(enum lttng_live_stream_state state) |
7cdc2bab | 69 | { |
4164020e SM |
70 | switch (state) { |
71 | case LTTNG_LIVE_STREAM_ACTIVE_NO_DATA: | |
72 | return "ACTIVE_NO_DATA"; | |
73 | case LTTNG_LIVE_STREAM_QUIESCENT_NO_DATA: | |
74 | return "QUIESCENT_NO_DATA"; | |
75 | case LTTNG_LIVE_STREAM_QUIESCENT: | |
76 | return "QUIESCENT"; | |
77 | case LTTNG_LIVE_STREAM_ACTIVE_DATA: | |
78 | return "ACTIVE_DATA"; | |
79 | case LTTNG_LIVE_STREAM_EOF: | |
80 | return "EOF"; | |
81 | default: | |
82 | return "ERROR"; | |
83 | } | |
7cdc2bab | 84 | } |
7cdc2bab | 85 | |
34533ae0 | 86 | void lttng_live_stream_iterator_set_state(struct lttng_live_stream_iterator *stream_iter, |
4164020e | 87 | enum lttng_live_stream_state new_state) |
34533ae0 | 88 | { |
4164020e SM |
89 | bt_self_component *self_comp = stream_iter->self_comp; |
90 | bt_logging_level log_level = stream_iter->log_level; | |
34533ae0 | 91 | |
4164020e SM |
92 | BT_COMP_LOGD("Setting live stream iterator state: viewer-stream-id=%" PRIu64 |
93 | ", old-state=%s, new-state=%s", | |
94 | stream_iter->viewer_stream_id, lttng_live_stream_state_string(stream_iter->state), | |
95 | lttng_live_stream_state_string(new_state)); | |
34533ae0 | 96 | |
4164020e | 97 | stream_iter->state = new_state; |
34533ae0 FD |
98 | } |
99 | ||
4164020e SM |
100 | #define LTTNG_LIVE_LOGD_STREAM_ITER(live_stream_iter) \ |
101 | do { \ | |
102 | BT_COMP_LOGD("Live stream iterator state=%s, " \ | |
103 | "last-inact-ts-is-set=%d, last-inact-ts-value=%" PRId64 ", " \ | |
104 | "curr-inact-ts=%" PRId64, \ | |
105 | lttng_live_stream_state_string(live_stream_iter->state), \ | |
106 | live_stream_iter->last_inactivity_ts.is_set, \ | |
107 | live_stream_iter->last_inactivity_ts.value, \ | |
108 | live_stream_iter->current_inactivity_ts); \ | |
109 | } while (0); | |
6f79a7cf | 110 | |
9b4f9b42 | 111 | bool lttng_live_graph_is_canceled(struct lttng_live_msg_iter *msg_iter) |
6f79a7cf | 112 | { |
4164020e | 113 | bool ret; |
6f79a7cf | 114 | |
4164020e SM |
115 | if (!msg_iter) { |
116 | ret = false; | |
117 | goto end; | |
118 | } | |
7cdc2bab | 119 | |
4164020e | 120 | ret = bt_self_message_iterator_is_interrupted(msg_iter->self_msg_iter); |
4bf0e537 | 121 | |
14f28187 | 122 | end: |
4164020e | 123 | return ret; |
7cdc2bab MD |
124 | } |
125 | ||
4164020e SM |
126 | static struct lttng_live_trace * |
127 | lttng_live_session_borrow_trace_by_id(struct lttng_live_session *session, uint64_t trace_id) | |
d3e4dcd8 | 128 | { |
4164020e SM |
129 | uint64_t trace_idx; |
130 | struct lttng_live_trace *ret_trace = NULL; | |
131 | ||
132 | for (trace_idx = 0; trace_idx < session->traces->len; trace_idx++) { | |
133 | struct lttng_live_trace *trace = | |
134 | (lttng_live_trace *) g_ptr_array_index(session->traces, trace_idx); | |
135 | if (trace->id == trace_id) { | |
136 | ret_trace = trace; | |
137 | goto end; | |
138 | } | |
139 | } | |
14f28187 FD |
140 | |
141 | end: | |
4164020e | 142 | return ret_trace; |
d3eb6e8f PP |
143 | } |
144 | ||
4164020e | 145 | static void lttng_live_destroy_trace(struct lttng_live_trace *trace) |
7cdc2bab | 146 | { |
4164020e SM |
147 | bt_logging_level log_level = trace->log_level; |
148 | bt_self_component *self_comp = trace->self_comp; | |
c01594de | 149 | |
4164020e | 150 | BT_COMP_LOGD("Destroying live trace: trace-id=%" PRIu64, trace->id); |
7cdc2bab | 151 | |
4164020e SM |
152 | BT_ASSERT(trace->stream_iterators); |
153 | g_ptr_array_free(trace->stream_iterators, TRUE); | |
5bd230f4 | 154 | |
4164020e SM |
155 | BT_TRACE_PUT_REF_AND_RESET(trace->trace); |
156 | BT_TRACE_CLASS_PUT_REF_AND_RESET(trace->trace_class); | |
5bd230f4 | 157 | |
4164020e SM |
158 | lttng_live_metadata_fini(trace); |
159 | g_free(trace); | |
7cdc2bab MD |
160 | } |
161 | ||
4164020e SM |
162 | static struct lttng_live_trace *lttng_live_create_trace(struct lttng_live_session *session, |
163 | uint64_t trace_id) | |
7cdc2bab | 164 | { |
4164020e SM |
165 | struct lttng_live_trace *trace = NULL; |
166 | bt_logging_level log_level = session->log_level; | |
167 | bt_self_component *self_comp = session->self_comp; | |
168 | ||
169 | BT_COMP_LOGD("Creating live trace: " | |
170 | "session-id=%" PRIu64 ", trace-id=%" PRIu64, | |
171 | session->id, trace_id); | |
172 | trace = g_new0(struct lttng_live_trace, 1); | |
173 | if (!trace) { | |
174 | BT_COMP_LOGE_APPEND_CAUSE(self_comp, "Failed to allocate live trace"); | |
175 | goto error; | |
176 | } | |
177 | trace->log_level = session->log_level; | |
178 | trace->self_comp = session->self_comp; | |
179 | trace->session = session; | |
180 | trace->id = trace_id; | |
181 | trace->trace_class = NULL; | |
182 | trace->trace = NULL; | |
183 | trace->stream_iterators = | |
184 | g_ptr_array_new_with_free_func((GDestroyNotify) lttng_live_stream_iterator_destroy); | |
185 | BT_ASSERT(trace->stream_iterators); | |
186 | trace->metadata_stream_state = LTTNG_LIVE_METADATA_STREAM_STATE_NEEDED; | |
187 | g_ptr_array_add(session->traces, trace); | |
188 | ||
189 | goto end; | |
7cdc2bab | 190 | error: |
4164020e SM |
191 | g_free(trace); |
192 | trace = NULL; | |
7cdc2bab | 193 | end: |
4164020e | 194 | return trace; |
7cdc2bab MD |
195 | } |
196 | ||
4164020e SM |
197 | struct lttng_live_trace * |
198 | lttng_live_session_borrow_or_create_trace_by_id(struct lttng_live_session *session, | |
199 | uint64_t trace_id) | |
7cdc2bab | 200 | { |
4164020e | 201 | struct lttng_live_trace *trace; |
7cdc2bab | 202 | |
4164020e SM |
203 | trace = lttng_live_session_borrow_trace_by_id(session, trace_id); |
204 | if (trace) { | |
205 | goto end; | |
206 | } | |
7cdc2bab | 207 | |
4164020e SM |
208 | /* The session is the owner of the newly created trace. */ |
209 | trace = lttng_live_create_trace(session, trace_id); | |
7cdc2bab | 210 | |
14f28187 | 211 | end: |
4164020e | 212 | return trace; |
7cdc2bab MD |
213 | } |
214 | ||
4164020e SM |
215 | int lttng_live_add_session(struct lttng_live_msg_iter *lttng_live_msg_iter, uint64_t session_id, |
216 | const char *hostname, const char *session_name) | |
7cdc2bab | 217 | { |
4164020e SM |
218 | int ret = 0; |
219 | struct lttng_live_session *session; | |
220 | bt_logging_level log_level = lttng_live_msg_iter->log_level; | |
221 | bt_self_component *self_comp = lttng_live_msg_iter->self_comp; | |
222 | ||
223 | BT_COMP_LOGD("Adding live session: " | |
224 | "session-id=%" PRIu64 ", hostname=\"%s\" session-name=\"%s\"", | |
225 | session_id, hostname, session_name); | |
226 | ||
227 | session = g_new0(struct lttng_live_session, 1); | |
228 | if (!session) { | |
229 | BT_COMP_LOGE_APPEND_CAUSE(self_comp, "Failed to allocate live session"); | |
230 | goto error; | |
231 | } | |
232 | ||
233 | session->log_level = lttng_live_msg_iter->log_level; | |
234 | session->self_comp = lttng_live_msg_iter->self_comp; | |
235 | session->id = session_id; | |
236 | session->traces = g_ptr_array_new_with_free_func((GDestroyNotify) lttng_live_destroy_trace); | |
237 | BT_ASSERT(session->traces); | |
238 | session->lttng_live_msg_iter = lttng_live_msg_iter; | |
239 | session->new_streams_needed = true; | |
240 | session->hostname = g_string_new(hostname); | |
241 | BT_ASSERT(session->hostname); | |
242 | ||
243 | session->session_name = g_string_new(session_name); | |
244 | BT_ASSERT(session->session_name); | |
245 | ||
246 | g_ptr_array_add(lttng_live_msg_iter->sessions, session); | |
247 | goto end; | |
7cdc2bab | 248 | error: |
4164020e SM |
249 | g_free(session); |
250 | ret = -1; | |
7cdc2bab | 251 | end: |
4164020e | 252 | return ret; |
7cdc2bab MD |
253 | } |
254 | ||
4164020e | 255 | static void lttng_live_destroy_session(struct lttng_live_session *session) |
7cdc2bab | 256 | { |
4164020e SM |
257 | bt_logging_level log_level; |
258 | bt_self_component *self_comp; | |
259 | ||
260 | if (!session) { | |
261 | goto end; | |
262 | } | |
263 | ||
264 | log_level = session->log_level; | |
265 | self_comp = session->self_comp; | |
266 | BT_COMP_LOGD("Destroying live session: " | |
267 | "session-id=%" PRIu64 ", session-name=\"%s\"", | |
268 | session->id, session->session_name->str); | |
269 | if (session->id != -1ULL) { | |
270 | if (lttng_live_session_detach(session)) { | |
271 | if (!lttng_live_graph_is_canceled(session->lttng_live_msg_iter)) { | |
272 | /* Old relayd cannot detach sessions. */ | |
273 | BT_COMP_LOGD("Unable to detach lttng live session %" PRIu64, session->id); | |
274 | } | |
275 | } | |
276 | session->id = -1ULL; | |
277 | } | |
278 | ||
279 | if (session->traces) { | |
280 | g_ptr_array_free(session->traces, TRUE); | |
281 | } | |
282 | ||
283 | if (session->hostname) { | |
284 | g_string_free(session->hostname, TRUE); | |
285 | } | |
286 | if (session->session_name) { | |
287 | g_string_free(session->session_name, TRUE); | |
288 | } | |
289 | g_free(session); | |
14f28187 FD |
290 | |
291 | end: | |
4164020e | 292 | return; |
7cdc2bab MD |
293 | } |
294 | ||
4164020e | 295 | static void lttng_live_msg_iter_destroy(struct lttng_live_msg_iter *lttng_live_msg_iter) |
7cdc2bab | 296 | { |
4164020e SM |
297 | if (!lttng_live_msg_iter) { |
298 | goto end; | |
299 | } | |
7cdc2bab | 300 | |
4164020e SM |
301 | if (lttng_live_msg_iter->sessions) { |
302 | g_ptr_array_free(lttng_live_msg_iter->sessions, TRUE); | |
303 | } | |
14f28187 | 304 | |
4164020e SM |
305 | if (lttng_live_msg_iter->viewer_connection) { |
306 | live_viewer_connection_destroy(lttng_live_msg_iter->viewer_connection); | |
307 | } | |
308 | BT_ASSERT(lttng_live_msg_iter->lttng_live_comp); | |
309 | BT_ASSERT(lttng_live_msg_iter->lttng_live_comp->has_msg_iter); | |
14f28187 | 310 | |
4164020e SM |
311 | /* All stream iterators must be destroyed at this point. */ |
312 | BT_ASSERT(lttng_live_msg_iter->active_stream_iter == 0); | |
313 | lttng_live_msg_iter->lttng_live_comp->has_msg_iter = false; | |
14f28187 | 314 | |
4164020e | 315 | g_free(lttng_live_msg_iter); |
14f28187 FD |
316 | |
317 | end: | |
4164020e | 318 | return; |
14f28187 FD |
319 | } |
320 | ||
14f28187 FD |
321 | void lttng_live_msg_iter_finalize(bt_self_message_iterator *self_msg_iter) |
322 | { | |
4164020e | 323 | struct lttng_live_msg_iter *lttng_live_msg_iter; |
14f28187 | 324 | |
4164020e | 325 | BT_ASSERT(self_msg_iter); |
14f28187 | 326 | |
4164020e SM |
327 | lttng_live_msg_iter = |
328 | (struct lttng_live_msg_iter *) bt_self_message_iterator_get_data(self_msg_iter); | |
329 | BT_ASSERT(lttng_live_msg_iter); | |
330 | lttng_live_msg_iter_destroy(lttng_live_msg_iter); | |
7cdc2bab MD |
331 | } |
332 | ||
4164020e SM |
333 | static enum lttng_live_iterator_status |
334 | lttng_live_iterator_next_check_stream_state(struct lttng_live_stream_iterator *lttng_live_stream) | |
7cdc2bab | 335 | { |
4164020e SM |
336 | bt_logging_level log_level = lttng_live_stream->log_level; |
337 | bt_self_component *self_comp = lttng_live_stream->self_comp; | |
338 | ||
339 | switch (lttng_live_stream->state) { | |
340 | case LTTNG_LIVE_STREAM_QUIESCENT: | |
341 | case LTTNG_LIVE_STREAM_ACTIVE_DATA: | |
342 | break; | |
343 | case LTTNG_LIVE_STREAM_ACTIVE_NO_DATA: | |
344 | /* Invalid state. */ | |
345 | BT_COMP_LOGF("Unexpected stream state \"ACTIVE_NO_DATA\""); | |
346 | bt_common_abort(); | |
347 | case LTTNG_LIVE_STREAM_QUIESCENT_NO_DATA: | |
348 | /* Invalid state. */ | |
349 | BT_COMP_LOGF("Unexpected stream state \"QUIESCENT_NO_DATA\""); | |
350 | bt_common_abort(); | |
351 | case LTTNG_LIVE_STREAM_EOF: | |
352 | break; | |
353 | } | |
354 | return LTTNG_LIVE_ITERATOR_STATUS_OK; | |
7cdc2bab MD |
355 | } |
356 | ||
357 | /* | |
f93afbf9 FD |
358 | * For active no data stream, fetch next index. As a result of that it can |
359 | * become either: | |
360 | * - quiescent: won't have events for a bit, | |
361 | * - have data: need to get that data and produce the event, | |
362 | * - have no data on this stream at this point: need to retry (AGAIN) or return | |
363 | * EOF. | |
7cdc2bab | 364 | */ |
4164020e SM |
365 | static enum lttng_live_iterator_status lttng_live_iterator_next_handle_one_no_data_stream( |
366 | struct lttng_live_msg_iter *lttng_live_msg_iter, | |
367 | struct lttng_live_stream_iterator *lttng_live_stream) | |
7cdc2bab | 368 | { |
4164020e SM |
369 | bt_logging_level log_level = lttng_live_msg_iter->log_level; |
370 | bt_self_component *self_comp = lttng_live_msg_iter->self_comp; | |
371 | enum lttng_live_iterator_status ret = LTTNG_LIVE_ITERATOR_STATUS_OK; | |
372 | enum lttng_live_stream_state orig_state = lttng_live_stream->state; | |
373 | struct packet_index index; | |
374 | ||
375 | if (lttng_live_stream->trace->metadata_stream_state == | |
376 | LTTNG_LIVE_METADATA_STREAM_STATE_NEEDED) { | |
377 | BT_COMP_LOGD( | |
378 | "Need to get an update for the metadata stream before proceeding further with this stream: " | |
379 | "stream-name=\"%s\"", | |
380 | lttng_live_stream->name->str); | |
381 | ret = LTTNG_LIVE_ITERATOR_STATUS_CONTINUE; | |
382 | goto end; | |
383 | } | |
384 | ||
385 | if (lttng_live_stream->trace->session->new_streams_needed) { | |
386 | BT_COMP_LOGD( | |
387 | "Need to get an update of all streams before proceeding further with this stream: " | |
388 | "stream-name=\"%s\"", | |
389 | lttng_live_stream->name->str); | |
390 | ret = LTTNG_LIVE_ITERATOR_STATUS_CONTINUE; | |
391 | goto end; | |
392 | } | |
393 | ||
394 | if (lttng_live_stream->state != LTTNG_LIVE_STREAM_ACTIVE_NO_DATA && | |
395 | lttng_live_stream->state != LTTNG_LIVE_STREAM_QUIESCENT_NO_DATA) { | |
396 | goto end; | |
397 | } | |
398 | ret = lttng_live_get_next_index(lttng_live_msg_iter, lttng_live_stream, &index); | |
399 | if (ret != LTTNG_LIVE_ITERATOR_STATUS_OK) { | |
400 | goto end; | |
401 | } | |
402 | ||
403 | BT_ASSERT_DBG(lttng_live_stream->state != LTTNG_LIVE_STREAM_EOF); | |
404 | ||
405 | if (lttng_live_stream->state == LTTNG_LIVE_STREAM_QUIESCENT) { | |
406 | uint64_t last_inact_ts = lttng_live_stream->last_inactivity_ts.value, | |
407 | curr_inact_ts = lttng_live_stream->current_inactivity_ts; | |
408 | ||
409 | if (orig_state == LTTNG_LIVE_STREAM_QUIESCENT_NO_DATA && last_inact_ts == curr_inact_ts) { | |
410 | /* | |
5cb27175 JG |
411 | * Because the stream is in the QUIESCENT_NO_DATA |
412 | * state, we can assert that the last_inactivity_ts was | |
413 | * set and can be safely used in the `if` above. | |
414 | */ | |
4164020e SM |
415 | BT_ASSERT(lttng_live_stream->last_inactivity_ts.is_set); |
416 | ||
417 | ret = LTTNG_LIVE_ITERATOR_STATUS_AGAIN; | |
418 | LTTNG_LIVE_LOGD_STREAM_ITER(lttng_live_stream); | |
419 | } else { | |
420 | ret = LTTNG_LIVE_ITERATOR_STATUS_CONTINUE; | |
421 | } | |
422 | goto end; | |
423 | } | |
424 | ||
425 | lttng_live_stream->base_offset = index.offset; | |
426 | lttng_live_stream->offset = index.offset; | |
427 | lttng_live_stream->len = index.packet_size / CHAR_BIT; | |
428 | ||
429 | BT_COMP_LOGD("Setting live stream reading info: stream-name=\"%s\", " | |
430 | "viewer-stream-id=%" PRIu64 ", stream-base-offset=%" PRIu64 | |
431 | ", stream-offset=%" PRIu64 ", stream-len=%" PRIu64, | |
432 | lttng_live_stream->name->str, lttng_live_stream->viewer_stream_id, | |
433 | lttng_live_stream->base_offset, lttng_live_stream->offset, lttng_live_stream->len); | |
f93afbf9 | 434 | |
7cdc2bab | 435 | end: |
4164020e SM |
436 | if (ret == LTTNG_LIVE_ITERATOR_STATUS_OK) { |
437 | ret = lttng_live_iterator_next_check_stream_state(lttng_live_stream); | |
438 | } | |
439 | return ret; | |
7cdc2bab MD |
440 | } |
441 | ||
442 | /* | |
14f28187 FD |
443 | * Creation of the message requires the ctf trace class to be created |
444 | * beforehand, but the live protocol gives us all streams (including metadata) | |
445 | * at once. So we split it in three steps: getting streams, getting metadata | |
446 | * (which creates the ctf trace class), and then creating the per-stream | |
447 | * messages. | |
7cdc2bab | 448 | */ |
4164020e SM |
449 | static enum lttng_live_iterator_status |
450 | lttng_live_get_session(struct lttng_live_msg_iter *lttng_live_msg_iter, | |
451 | struct lttng_live_session *session) | |
7cdc2bab | 452 | { |
4164020e SM |
453 | bt_logging_level log_level = lttng_live_msg_iter->log_level; |
454 | bt_self_component *self_comp = lttng_live_msg_iter->self_comp; | |
455 | enum lttng_live_iterator_status status; | |
456 | uint64_t trace_idx; | |
457 | ||
458 | if (!session->attached) { | |
459 | BT_COMP_LOGD("Attach to session: session-id=%" PRIu64, session->id); | |
460 | enum lttng_live_viewer_status attach_status = | |
461 | lttng_live_session_attach(session, lttng_live_msg_iter->self_msg_iter); | |
462 | if (attach_status != LTTNG_LIVE_VIEWER_STATUS_OK) { | |
463 | if (lttng_live_graph_is_canceled(lttng_live_msg_iter)) { | |
464 | /* | |
465 | * Clear any causes appended in | |
466 | * `lttng_live_attach_session()` as we want to | |
467 | * return gracefully since the graph was | |
468 | * cancelled. | |
469 | */ | |
470 | bt_current_thread_clear_error(); | |
471 | status = LTTNG_LIVE_ITERATOR_STATUS_AGAIN; | |
472 | } else { | |
473 | status = LTTNG_LIVE_ITERATOR_STATUS_ERROR; | |
474 | BT_COMP_LOGE_APPEND_CAUSE(self_comp, "Error attaching to LTTng live session"); | |
475 | } | |
476 | goto end; | |
477 | } | |
478 | } | |
479 | ||
a4f118a3 | 480 | BT_COMP_LOGD("Updating all data streams: " |
4164020e SM |
481 | "session-id=%" PRIu64 ", session-name=\"%s\"", |
482 | session->id, session->session_name->str); | |
483 | ||
484 | status = lttng_live_session_get_new_streams(session, lttng_live_msg_iter->self_msg_iter); | |
a4f118a3 FD |
485 | switch (status) { |
486 | case LTTNG_LIVE_ITERATOR_STATUS_OK: | |
487 | break; | |
488 | case LTTNG_LIVE_ITERATOR_STATUS_END: | |
489 | /* | |
490 | * We received a `_END` from the `_get_new_streams()` function, | |
491 | * which means no more data will ever be received from the data | |
492 | * streams of this session. But it's possible that the metadata | |
493 | * is incomplete. | |
494 | * The live protocol guarantees that we receive all the | |
495 | * metadata needed before we receive data streams needing it. | |
496 | * But it's possible to receive metadata NOT needed by | |
497 | * data streams after the session was closed. For example, this | |
498 | * could happen if a new event is registered and the session is | |
499 | * stopped before any tracepoint for that event is actually | |
500 | * fired. | |
501 | */ | |
502 | BT_COMP_LOGD( | |
503 | "Updating streams returned _END status. Override status to _OK in order fetch any remaining metadata:" | |
504 | "session-id=%" PRIu64 ", session-name=\"%s\"", | |
505 | session->id, session->session_name->str); | |
506 | status = LTTNG_LIVE_ITERATOR_STATUS_OK; | |
507 | break; | |
508 | default: | |
4164020e SM |
509 | goto end; |
510 | } | |
511 | ||
a4f118a3 FD |
512 | BT_COMP_LOGD("Updating metadata stream for session: " |
513 | "session-id=%" PRIu64 ", session-name=\"%s\"", | |
514 | session->id, session->session_name->str); | |
515 | ||
4164020e SM |
516 | trace_idx = 0; |
517 | while (trace_idx < session->traces->len) { | |
518 | struct lttng_live_trace *trace = | |
519 | (lttng_live_trace *) g_ptr_array_index(session->traces, trace_idx); | |
520 | ||
521 | status = lttng_live_metadata_update(trace); | |
522 | switch (status) { | |
523 | case LTTNG_LIVE_ITERATOR_STATUS_END: | |
524 | case LTTNG_LIVE_ITERATOR_STATUS_OK: | |
525 | trace_idx++; | |
526 | break; | |
527 | case LTTNG_LIVE_ITERATOR_STATUS_CONTINUE: | |
528 | case LTTNG_LIVE_ITERATOR_STATUS_AGAIN: | |
529 | goto end; | |
530 | default: | |
531 | BT_COMP_LOGE_APPEND_CAUSE(self_comp, | |
532 | "Error updating trace metadata: " | |
533 | "stream-iter-status=%s, trace-id=%" PRIu64, | |
534 | lttng_live_iterator_status_string(status), trace->id); | |
535 | goto end; | |
536 | } | |
537 | } | |
538 | ||
539 | /* | |
540 | * Now that we have the metadata we can initialize the downstream | |
541 | * iterator. | |
542 | */ | |
543 | status = lttng_live_lazy_msg_init(session, lttng_live_msg_iter->self_msg_iter); | |
14f28187 FD |
544 | |
545 | end: | |
4164020e | 546 | return status; |
7cdc2bab MD |
547 | } |
548 | ||
4164020e SM |
549 | static void |
550 | lttng_live_force_new_streams_and_metadata(struct lttng_live_msg_iter *lttng_live_msg_iter) | |
7cdc2bab | 551 | { |
4164020e SM |
552 | uint64_t session_idx, trace_idx; |
553 | bt_logging_level log_level = lttng_live_msg_iter->log_level; | |
554 | bt_self_component *self_comp = lttng_live_msg_iter->self_comp; | |
555 | ||
556 | for (session_idx = 0; session_idx < lttng_live_msg_iter->sessions->len; session_idx++) { | |
557 | struct lttng_live_session *session = | |
558 | (lttng_live_session *) g_ptr_array_index(lttng_live_msg_iter->sessions, session_idx); | |
559 | BT_COMP_LOGD("Force marking session as needing new streams: " | |
560 | "session-id=%" PRIu64, | |
561 | session->id); | |
562 | session->new_streams_needed = true; | |
563 | for (trace_idx = 0; trace_idx < session->traces->len; trace_idx++) { | |
564 | struct lttng_live_trace *trace = | |
565 | (lttng_live_trace *) g_ptr_array_index(session->traces, trace_idx); | |
566 | BT_COMP_LOGD("Force marking trace metadata state as needing an update: " | |
567 | "session-id=%" PRIu64 ", trace-id=%" PRIu64, | |
568 | session->id, trace->id); | |
569 | ||
570 | BT_ASSERT(trace->metadata_stream_state != LTTNG_LIVE_METADATA_STREAM_STATE_CLOSED); | |
571 | ||
572 | trace->metadata_stream_state = LTTNG_LIVE_METADATA_STREAM_STATE_NEEDED; | |
573 | } | |
574 | } | |
7cdc2bab MD |
575 | } |
576 | ||
4164020e SM |
577 | static enum lttng_live_iterator_status |
578 | lttng_live_iterator_handle_new_streams_and_metadata(struct lttng_live_msg_iter *lttng_live_msg_iter) | |
7cdc2bab | 579 | { |
4164020e SM |
580 | enum lttng_live_iterator_status status; |
581 | enum lttng_live_viewer_status viewer_status; | |
582 | bt_logging_level log_level = lttng_live_msg_iter->log_level; | |
583 | bt_self_component *self_comp = lttng_live_msg_iter->self_comp; | |
584 | uint64_t session_idx = 0, nr_sessions_opened = 0; | |
585 | struct lttng_live_session *session; | |
586 | enum session_not_found_action sess_not_found_act = | |
587 | lttng_live_msg_iter->lttng_live_comp->params.sess_not_found_act; | |
588 | ||
589 | BT_COMP_LOGD("Update data and metadata of all sessions: " | |
590 | "live-msg-iter-addr=%p", | |
591 | lttng_live_msg_iter); | |
592 | /* | |
593 | * In a remotely distant future, we could add a "new | |
594 | * session" flag to the protocol, which would tell us that we | |
595 | * need to query for new sessions even though we have sessions | |
596 | * currently ongoing. | |
597 | */ | |
598 | if (lttng_live_msg_iter->sessions->len == 0) { | |
599 | if (sess_not_found_act != SESSION_NOT_FOUND_ACTION_CONTINUE) { | |
600 | BT_COMP_LOGD( | |
601 | "No session found. Exiting in accordance with the `session-not-found-action` parameter"); | |
602 | status = LTTNG_LIVE_ITERATOR_STATUS_END; | |
603 | goto end; | |
604 | } else { | |
605 | BT_COMP_LOGD( | |
606 | "No session found. Try creating a new one in accordance with the `session-not-found-action` parameter"); | |
607 | /* | |
608 | * Retry to create a viewer session for the requested | |
609 | * session name. | |
610 | */ | |
611 | viewer_status = lttng_live_create_viewer_session(lttng_live_msg_iter); | |
612 | if (viewer_status != LTTNG_LIVE_VIEWER_STATUS_OK) { | |
613 | if (viewer_status == LTTNG_LIVE_VIEWER_STATUS_ERROR) { | |
614 | status = LTTNG_LIVE_ITERATOR_STATUS_ERROR; | |
615 | BT_COMP_LOGE_APPEND_CAUSE(self_comp, | |
616 | "Error creating LTTng live viewer session"); | |
617 | } else if (viewer_status == LTTNG_LIVE_VIEWER_STATUS_INTERRUPTED) { | |
618 | status = LTTNG_LIVE_ITERATOR_STATUS_AGAIN; | |
619 | } else { | |
620 | bt_common_abort(); | |
621 | } | |
622 | goto end; | |
623 | } | |
624 | } | |
625 | } | |
626 | ||
627 | for (session_idx = 0; session_idx < lttng_live_msg_iter->sessions->len; session_idx++) { | |
628 | session = | |
629 | (lttng_live_session *) g_ptr_array_index(lttng_live_msg_iter->sessions, session_idx); | |
630 | status = lttng_live_get_session(lttng_live_msg_iter, session); | |
631 | switch (status) { | |
632 | case LTTNG_LIVE_ITERATOR_STATUS_OK: | |
4164020e | 633 | case LTTNG_LIVE_ITERATOR_STATUS_END: |
a4f118a3 FD |
634 | /* |
635 | * A session returned `_END`. Other sessions may still | |
636 | * be active so we override the status and continue | |
637 | * looping if needed. | |
638 | */ | |
4164020e SM |
639 | break; |
640 | default: | |
641 | goto end; | |
642 | } | |
643 | if (!session->closed) { | |
644 | nr_sessions_opened++; | |
645 | } | |
646 | } | |
647 | ||
648 | if (sess_not_found_act != SESSION_NOT_FOUND_ACTION_CONTINUE && nr_sessions_opened == 0) { | |
649 | status = LTTNG_LIVE_ITERATOR_STATUS_END; | |
650 | } else { | |
651 | status = LTTNG_LIVE_ITERATOR_STATUS_OK; | |
652 | } | |
f79c2d7a FD |
653 | |
654 | end: | |
4164020e | 655 | return status; |
7cdc2bab MD |
656 | } |
657 | ||
4164020e SM |
658 | static enum lttng_live_iterator_status |
659 | emit_inactivity_message(struct lttng_live_msg_iter *lttng_live_msg_iter, | |
660 | struct lttng_live_stream_iterator *stream_iter, const bt_message **message, | |
661 | uint64_t timestamp) | |
7cdc2bab | 662 | { |
4164020e SM |
663 | enum lttng_live_iterator_status ret = LTTNG_LIVE_ITERATOR_STATUS_OK; |
664 | bt_logging_level log_level = lttng_live_msg_iter->log_level; | |
665 | bt_self_component *self_comp = lttng_live_msg_iter->self_comp; | |
666 | bt_message *msg = NULL; | |
667 | ||
668 | BT_ASSERT(stream_iter->trace->clock_class); | |
669 | ||
670 | BT_COMP_LOGD("Emitting inactivity message for stream: ctf-stream-id=%" PRIu64 | |
671 | ", viewer-stream-id=%" PRIu64 ", timestamp=%" PRIu64, | |
672 | stream_iter->ctf_stream_class_id.value, stream_iter->viewer_stream_id, timestamp); | |
673 | ||
674 | msg = bt_message_message_iterator_inactivity_create(lttng_live_msg_iter->self_msg_iter, | |
675 | stream_iter->trace->clock_class, timestamp); | |
676 | if (!msg) { | |
677 | BT_COMP_LOGE_APPEND_CAUSE(self_comp, "Error emitting message iterator inactivity message"); | |
678 | goto error; | |
679 | } | |
680 | ||
681 | *message = msg; | |
7cdc2bab | 682 | end: |
4164020e | 683 | return ret; |
7cdc2bab MD |
684 | |
685 | error: | |
4164020e SM |
686 | ret = LTTNG_LIVE_ITERATOR_STATUS_ERROR; |
687 | bt_message_put_ref(msg); | |
688 | goto end; | |
7cdc2bab MD |
689 | } |
690 | ||
4164020e SM |
691 | static enum lttng_live_iterator_status lttng_live_iterator_next_handle_one_quiescent_stream( |
692 | struct lttng_live_msg_iter *lttng_live_msg_iter, | |
693 | struct lttng_live_stream_iterator *lttng_live_stream, const bt_message **message) | |
7cdc2bab | 694 | { |
4164020e SM |
695 | enum lttng_live_iterator_status ret = LTTNG_LIVE_ITERATOR_STATUS_OK; |
696 | ||
697 | if (lttng_live_stream->state != LTTNG_LIVE_STREAM_QUIESCENT) { | |
698 | return LTTNG_LIVE_ITERATOR_STATUS_OK; | |
699 | } | |
700 | ||
701 | /* | |
702 | * Check if we already sent an inactivty message downstream for this | |
703 | * `current_inactivity_ts` value. | |
704 | */ | |
705 | if (lttng_live_stream->last_inactivity_ts.is_set && | |
706 | lttng_live_stream->current_inactivity_ts == lttng_live_stream->last_inactivity_ts.value) { | |
707 | lttng_live_stream_iterator_set_state(lttng_live_stream, | |
708 | LTTNG_LIVE_STREAM_QUIESCENT_NO_DATA); | |
709 | ||
710 | ret = LTTNG_LIVE_ITERATOR_STATUS_CONTINUE; | |
711 | goto end; | |
712 | } | |
713 | ||
714 | ret = emit_inactivity_message(lttng_live_msg_iter, lttng_live_stream, message, | |
715 | lttng_live_stream->current_inactivity_ts); | |
716 | ||
717 | lttng_live_stream->last_inactivity_ts.value = lttng_live_stream->current_inactivity_ts; | |
718 | lttng_live_stream->last_inactivity_ts.is_set = true; | |
14f28187 | 719 | end: |
4164020e | 720 | return ret; |
14f28187 FD |
721 | } |
722 | ||
ecd7492f | 723 | static int live_get_msg_ts_ns(struct lttng_live_stream_iterator *, |
4164020e SM |
724 | struct lttng_live_msg_iter *lttng_live_msg_iter, |
725 | const bt_message *msg, int64_t last_msg_ts_ns, int64_t *ts_ns) | |
14f28187 | 726 | { |
4164020e SM |
727 | const bt_clock_snapshot *clock_snapshot = NULL; |
728 | int ret = 0; | |
729 | bt_logging_level log_level = lttng_live_msg_iter->log_level; | |
730 | bt_self_component *self_comp = lttng_live_msg_iter->self_comp; | |
731 | ||
732 | BT_ASSERT_DBG(msg); | |
733 | BT_ASSERT_DBG(ts_ns); | |
734 | ||
735 | BT_COMP_LOGD("Getting message's timestamp: iter-data-addr=%p, msg-addr=%p, " | |
736 | "last-msg-ts=%" PRId64, | |
737 | lttng_live_msg_iter, msg, last_msg_ts_ns); | |
738 | ||
739 | switch (bt_message_get_type(msg)) { | |
740 | case BT_MESSAGE_TYPE_EVENT: | |
4164020e SM |
741 | clock_snapshot = bt_message_event_borrow_default_clock_snapshot_const(msg); |
742 | break; | |
743 | case BT_MESSAGE_TYPE_PACKET_BEGINNING: | |
4164020e SM |
744 | clock_snapshot = bt_message_packet_beginning_borrow_default_clock_snapshot_const(msg); |
745 | break; | |
746 | case BT_MESSAGE_TYPE_PACKET_END: | |
4164020e SM |
747 | clock_snapshot = bt_message_packet_end_borrow_default_clock_snapshot_const(msg); |
748 | break; | |
749 | case BT_MESSAGE_TYPE_DISCARDED_EVENTS: | |
4164020e SM |
750 | clock_snapshot = |
751 | bt_message_discarded_events_borrow_beginning_default_clock_snapshot_const(msg); | |
752 | break; | |
753 | case BT_MESSAGE_TYPE_DISCARDED_PACKETS: | |
4164020e SM |
754 | clock_snapshot = |
755 | bt_message_discarded_packets_borrow_beginning_default_clock_snapshot_const(msg); | |
756 | break; | |
757 | case BT_MESSAGE_TYPE_MESSAGE_ITERATOR_INACTIVITY: | |
758 | clock_snapshot = bt_message_message_iterator_inactivity_borrow_clock_snapshot_const(msg); | |
759 | break; | |
760 | default: | |
761 | /* All the other messages have a higher priority */ | |
762 | BT_COMP_LOGD_STR("Message has no timestamp: using the last message timestamp."); | |
763 | *ts_ns = last_msg_ts_ns; | |
764 | goto end; | |
765 | } | |
766 | ||
4164020e SM |
767 | ret = bt_clock_snapshot_get_ns_from_origin(clock_snapshot, ts_ns); |
768 | if (ret) { | |
769 | BT_COMP_LOGE_APPEND_CAUSE(self_comp, | |
770 | "Cannot get nanoseconds from Epoch of clock snapshot: " | |
771 | "clock-snapshot-addr=%p", | |
772 | clock_snapshot); | |
773 | goto error; | |
774 | } | |
775 | ||
776 | goto end; | |
14f28187 | 777 | |
14f28187 | 778 | error: |
4164020e | 779 | ret = -1; |
7cdc2bab | 780 | |
7cdc2bab | 781 | end: |
4164020e SM |
782 | if (ret == 0) { |
783 | BT_COMP_LOGD("Found message's timestamp: " | |
784 | "iter-data-addr=%p, msg-addr=%p, " | |
785 | "last-msg-ts=%" PRId64 ", ts=%" PRId64, | |
786 | lttng_live_msg_iter, msg, last_msg_ts_ns, *ts_ns); | |
787 | } | |
788 | ||
789 | return ret; | |
7cdc2bab MD |
790 | } |
791 | ||
4164020e SM |
792 | static enum lttng_live_iterator_status lttng_live_iterator_next_handle_one_active_data_stream( |
793 | struct lttng_live_msg_iter *lttng_live_msg_iter, | |
794 | struct lttng_live_stream_iterator *lttng_live_stream, const bt_message **message) | |
7cdc2bab | 795 | { |
4164020e SM |
796 | enum lttng_live_iterator_status ret = LTTNG_LIVE_ITERATOR_STATUS_OK; |
797 | bt_logging_level log_level = lttng_live_msg_iter->log_level; | |
798 | bt_self_component *self_comp = lttng_live_msg_iter->self_comp; | |
799 | enum ctf_msg_iter_status status; | |
800 | uint64_t session_idx, trace_idx; | |
801 | ||
802 | for (session_idx = 0; session_idx < lttng_live_msg_iter->sessions->len; session_idx++) { | |
803 | struct lttng_live_session *session = | |
804 | (lttng_live_session *) g_ptr_array_index(lttng_live_msg_iter->sessions, session_idx); | |
805 | ||
806 | if (session->new_streams_needed) { | |
807 | BT_COMP_LOGD("Need an update for streams: " | |
808 | "session-id=%" PRIu64, | |
809 | session->id); | |
810 | ret = LTTNG_LIVE_ITERATOR_STATUS_CONTINUE; | |
811 | goto end; | |
812 | } | |
813 | for (trace_idx = 0; trace_idx < session->traces->len; trace_idx++) { | |
814 | struct lttng_live_trace *trace = | |
815 | (lttng_live_trace *) g_ptr_array_index(session->traces, trace_idx); | |
816 | if (trace->metadata_stream_state == LTTNG_LIVE_METADATA_STREAM_STATE_NEEDED) { | |
817 | BT_COMP_LOGD("Need an update for metadata stream: " | |
818 | "session-id=%" PRIu64 ", trace-id=%" PRIu64, | |
819 | session->id, trace->id); | |
820 | ret = LTTNG_LIVE_ITERATOR_STATUS_CONTINUE; | |
821 | goto end; | |
822 | } | |
823 | } | |
824 | } | |
825 | ||
826 | if (lttng_live_stream->state != LTTNG_LIVE_STREAM_ACTIVE_DATA) { | |
827 | ret = LTTNG_LIVE_ITERATOR_STATUS_ERROR; | |
828 | BT_COMP_LOGE_APPEND_CAUSE(self_comp, | |
829 | "Invalid state of live stream iterator" | |
830 | "stream-iter-status=%s", | |
831 | lttng_live_stream_state_string(lttng_live_stream->state)); | |
832 | goto end; | |
833 | } | |
834 | ||
835 | status = ctf_msg_iter_get_next_message(lttng_live_stream->msg_iter, message); | |
836 | switch (status) { | |
837 | case CTF_MSG_ITER_STATUS_EOF: | |
838 | ret = LTTNG_LIVE_ITERATOR_STATUS_END; | |
839 | break; | |
840 | case CTF_MSG_ITER_STATUS_OK: | |
841 | ret = LTTNG_LIVE_ITERATOR_STATUS_OK; | |
842 | break; | |
843 | case CTF_MSG_ITER_STATUS_AGAIN: | |
844 | /* | |
845 | * Continue immediately (end of packet). The next | |
846 | * get_index may return AGAIN to delay the following | |
847 | * attempt. | |
848 | */ | |
849 | ret = LTTNG_LIVE_ITERATOR_STATUS_CONTINUE; | |
850 | break; | |
851 | case CTF_MSG_ITER_STATUS_ERROR: | |
852 | default: | |
853 | ret = LTTNG_LIVE_ITERATOR_STATUS_ERROR; | |
854 | BT_COMP_LOGE_APPEND_CAUSE(self_comp, | |
855 | "CTF message iterator failed to get next message: " | |
856 | "msg-iter=%p, msg-iter-status=%s", | |
857 | lttng_live_stream->msg_iter, ctf_msg_iter_status_string(status)); | |
858 | break; | |
859 | } | |
14f28187 FD |
860 | |
861 | end: | |
4164020e | 862 | return ret; |
7cdc2bab MD |
863 | } |
864 | ||
4164020e SM |
865 | static enum lttng_live_iterator_status |
866 | lttng_live_iterator_close_stream(struct lttng_live_msg_iter *lttng_live_msg_iter, | |
867 | struct lttng_live_stream_iterator *stream_iter, | |
868 | const bt_message **curr_msg) | |
4a39caef | 869 | { |
4164020e SM |
870 | enum lttng_live_iterator_status live_status = LTTNG_LIVE_ITERATOR_STATUS_OK; |
871 | bt_logging_level log_level = lttng_live_msg_iter->log_level; | |
872 | bt_self_component *self_comp = lttng_live_msg_iter->self_comp; | |
873 | ||
874 | BT_COMP_LOGD("Closing live stream iterator: stream-name=\"%s\", " | |
875 | "viewer-stream-id=%" PRIu64, | |
876 | stream_iter->name->str, stream_iter->viewer_stream_id); | |
877 | ||
878 | /* | |
879 | * The viewer has hung up on us so we are closing the stream. The | |
880 | * `ctf_msg_iter` should simply realize that it needs to close the | |
881 | * stream properly by emitting the necessary stream end message. | |
882 | */ | |
883 | enum ctf_msg_iter_status status = | |
884 | ctf_msg_iter_get_next_message(stream_iter->msg_iter, curr_msg); | |
885 | ||
886 | if (status == CTF_MSG_ITER_STATUS_ERROR) { | |
887 | BT_COMP_LOGE_APPEND_CAUSE(self_comp, | |
888 | "Error getting the next message from CTF message iterator"); | |
889 | live_status = LTTNG_LIVE_ITERATOR_STATUS_ERROR; | |
890 | goto end; | |
891 | } else if (status == CTF_MSG_ITER_STATUS_EOF) { | |
892 | BT_COMP_LOGI("Reached the end of the live stream iterator."); | |
893 | live_status = LTTNG_LIVE_ITERATOR_STATUS_END; | |
894 | goto end; | |
895 | } | |
896 | ||
897 | BT_ASSERT(status == CTF_MSG_ITER_STATUS_OK); | |
4a39caef FD |
898 | |
899 | end: | |
4164020e | 900 | return live_status; |
4a39caef FD |
901 | } |
902 | ||
7cdc2bab MD |
903 | /* |
904 | * helper function: | |
905 | * handle_no_data_streams() | |
906 | * retry: | |
907 | * - for each ACTIVE_NO_DATA stream: | |
908 | * - query relayd for stream data, or quiescence info. | |
909 | * - if need metadata, get metadata, goto retry. | |
910 | * - if new stream, get new stream as ACTIVE_NO_DATA, goto retry | |
911 | * - if quiescent, move to QUIESCENT streams | |
912 | * - if fetched data, move to ACTIVE_DATA streams | |
913 | * (at this point each stream either has data, or is quiescent) | |
914 | * | |
915 | * | |
916 | * iterator_next: | |
917 | * handle_new_streams_and_metadata() | |
918 | * - query relayd for known streams, add them as ACTIVE_NO_DATA | |
919 | * - query relayd for metadata | |
920 | * | |
921 | * call handle_active_no_data_streams() | |
922 | * | |
923 | * handle_quiescent_streams() | |
924 | * - if at least one stream is ACTIVE_DATA: | |
925 | * - peek stream event with lowest timestamp -> next_ts | |
926 | * - for each quiescent stream | |
927 | * - if next_ts >= quiescent end | |
928 | * - set state to ACTIVE_NO_DATA | |
929 | * - else | |
930 | * - for each quiescent stream | |
931 | * - set state to ACTIVE_NO_DATA | |
932 | * | |
933 | * call handle_active_no_data_streams() | |
934 | * | |
935 | * handle_active_data_streams() | |
936 | * - if at least one stream is ACTIVE_DATA: | |
937 | * - get stream event with lowest timestamp from heap | |
d6e69534 | 938 | * - make that stream event the current message. |
7cdc2bab MD |
939 | * - move this stream heap position to its next event |
940 | * - if we need to fetch data from relayd, move | |
941 | * stream to ACTIVE_NO_DATA. | |
942 | * - return OK | |
943 | * - return AGAIN | |
944 | * | |
945 | * end criterion: ctrl-c on client. If relayd exits or the session | |
946 | * closes on the relay daemon side, we keep on waiting for streams. | |
947 | * Eventually handle --end timestamp (also an end criterion). | |
948 | * | |
949 | * When disconnected from relayd: try to re-connect endlessly. | |
950 | */ | |
4164020e SM |
951 | static enum lttng_live_iterator_status |
952 | lttng_live_iterator_next_msg_on_stream(struct lttng_live_msg_iter *lttng_live_msg_iter, | |
953 | struct lttng_live_stream_iterator *stream_iter, | |
954 | const bt_message **curr_msg) | |
7cdc2bab | 955 | { |
4164020e SM |
956 | bt_logging_level log_level = lttng_live_msg_iter->log_level; |
957 | bt_self_component *self_comp = lttng_live_msg_iter->self_comp; | |
958 | enum lttng_live_iterator_status live_status; | |
959 | ||
960 | BT_COMP_LOGD("Advancing live stream iterator until next message if possible: " | |
961 | "stream-name=\"%s\", viewer-stream-id=%" PRIu64, | |
962 | stream_iter->name->str, stream_iter->viewer_stream_id); | |
963 | ||
964 | if (stream_iter->has_stream_hung_up) { | |
965 | /* | |
966 | * The stream has hung up and the stream was properly closed | |
967 | * during the last call to the current function. Return _END | |
968 | * status now so that this stream iterator is removed for the | |
969 | * stream iterator list. | |
970 | */ | |
971 | live_status = LTTNG_LIVE_ITERATOR_STATUS_END; | |
972 | goto end; | |
973 | } | |
4a39caef | 974 | |
7cdc2bab | 975 | retry: |
4164020e SM |
976 | LTTNG_LIVE_LOGD_STREAM_ITER(stream_iter); |
977 | ||
978 | /* | |
979 | * Make sure we have the most recent metadata and possibly some new | |
980 | * streams. | |
981 | */ | |
982 | live_status = lttng_live_iterator_handle_new_streams_and_metadata(lttng_live_msg_iter); | |
983 | if (live_status != LTTNG_LIVE_ITERATOR_STATUS_OK) { | |
984 | goto end; | |
985 | } | |
986 | ||
987 | live_status = | |
988 | lttng_live_iterator_next_handle_one_no_data_stream(lttng_live_msg_iter, stream_iter); | |
989 | if (live_status != LTTNG_LIVE_ITERATOR_STATUS_OK) { | |
990 | if (live_status == LTTNG_LIVE_ITERATOR_STATUS_END) { | |
991 | /* | |
992 | * We overwrite `live_status` since `curr_msg` is | |
993 | * likely set to a valid message in this function. | |
994 | */ | |
995 | live_status = | |
996 | lttng_live_iterator_close_stream(lttng_live_msg_iter, stream_iter, curr_msg); | |
997 | } | |
998 | goto end; | |
999 | } | |
1000 | ||
1001 | live_status = lttng_live_iterator_next_handle_one_quiescent_stream(lttng_live_msg_iter, | |
1002 | stream_iter, curr_msg); | |
1003 | if (live_status != LTTNG_LIVE_ITERATOR_STATUS_OK) { | |
1004 | BT_ASSERT(!*curr_msg); | |
1005 | goto end; | |
1006 | } | |
1007 | if (*curr_msg) { | |
1008 | goto end; | |
1009 | } | |
1010 | live_status = lttng_live_iterator_next_handle_one_active_data_stream(lttng_live_msg_iter, | |
1011 | stream_iter, curr_msg); | |
1012 | if (live_status != LTTNG_LIVE_ITERATOR_STATUS_OK) { | |
1013 | BT_ASSERT(!*curr_msg); | |
1014 | } | |
7cdc2bab MD |
1015 | |
1016 | end: | |
4164020e SM |
1017 | if (live_status == LTTNG_LIVE_ITERATOR_STATUS_CONTINUE) { |
1018 | BT_COMP_LOGD("Ask the relay daemon for an updated view of the data and metadata streams"); | |
1019 | goto retry; | |
1020 | } | |
14f28187 | 1021 | |
4164020e SM |
1022 | BT_COMP_LOGD("Returning from advancing live stream iterator: status=%s, " |
1023 | "stream-name=\"%s\", viewer-stream-id=%" PRIu64, | |
1024 | lttng_live_iterator_status_string(live_status), stream_iter->name->str, | |
1025 | stream_iter->viewer_stream_id); | |
f93afbf9 | 1026 | |
4164020e | 1027 | return live_status; |
7cdc2bab MD |
1028 | } |
1029 | ||
4164020e | 1030 | static bool is_discarded_packet_or_event_message(const bt_message *msg) |
8ec4d5ff | 1031 | { |
4164020e | 1032 | const enum bt_message_type msg_type = bt_message_get_type(msg); |
8ec4d5ff | 1033 | |
4164020e SM |
1034 | return msg_type == BT_MESSAGE_TYPE_DISCARDED_EVENTS || |
1035 | msg_type == BT_MESSAGE_TYPE_DISCARDED_PACKETS; | |
8ec4d5ff JG |
1036 | } |
1037 | ||
4164020e SM |
1038 | static enum lttng_live_iterator_status |
1039 | adjust_discarded_packets_message(bt_self_message_iterator *iter, const bt_stream *stream, | |
1040 | const bt_message *msg_in, bt_message **msg_out, | |
1041 | uint64_t new_begin_ts) | |
8ec4d5ff | 1042 | { |
4164020e SM |
1043 | enum lttng_live_iterator_status status = LTTNG_LIVE_ITERATOR_STATUS_OK; |
1044 | enum bt_property_availability availability; | |
1045 | const bt_clock_snapshot *clock_snapshot; | |
1046 | uint64_t end_ts; | |
1047 | uint64_t count; | |
1048 | ||
1049 | clock_snapshot = bt_message_discarded_packets_borrow_end_default_clock_snapshot_const(msg_in); | |
1050 | end_ts = bt_clock_snapshot_get_value(clock_snapshot); | |
1051 | ||
1052 | availability = bt_message_discarded_packets_get_count(msg_in, &count); | |
1053 | BT_ASSERT_DBG(availability == BT_PROPERTY_AVAILABILITY_AVAILABLE); | |
1054 | ||
1055 | *msg_out = bt_message_discarded_packets_create_with_default_clock_snapshots( | |
1056 | iter, stream, new_begin_ts, end_ts); | |
1057 | if (!*msg_out) { | |
1058 | status = LTTNG_LIVE_ITERATOR_STATUS_NOMEM; | |
1059 | goto end; | |
1060 | } | |
1061 | ||
1062 | bt_message_discarded_packets_set_count(*msg_out, count); | |
8ec4d5ff | 1063 | end: |
4164020e | 1064 | return status; |
8ec4d5ff JG |
1065 | } |
1066 | ||
4164020e SM |
1067 | static enum lttng_live_iterator_status |
1068 | adjust_discarded_events_message(bt_self_message_iterator *iter, const bt_stream *stream, | |
1069 | const bt_message *msg_in, bt_message **msg_out, | |
1070 | uint64_t new_begin_ts) | |
8ec4d5ff | 1071 | { |
4164020e SM |
1072 | enum lttng_live_iterator_status status = LTTNG_LIVE_ITERATOR_STATUS_OK; |
1073 | enum bt_property_availability availability; | |
1074 | const bt_clock_snapshot *clock_snapshot; | |
1075 | uint64_t end_ts; | |
1076 | uint64_t count; | |
1077 | ||
1078 | clock_snapshot = bt_message_discarded_events_borrow_end_default_clock_snapshot_const(msg_in); | |
1079 | end_ts = bt_clock_snapshot_get_value(clock_snapshot); | |
1080 | ||
1081 | availability = bt_message_discarded_events_get_count(msg_in, &count); | |
1082 | BT_ASSERT_DBG(availability == BT_PROPERTY_AVAILABILITY_AVAILABLE); | |
1083 | ||
1084 | *msg_out = bt_message_discarded_events_create_with_default_clock_snapshots( | |
1085 | iter, stream, new_begin_ts, end_ts); | |
1086 | if (!*msg_out) { | |
1087 | status = LTTNG_LIVE_ITERATOR_STATUS_NOMEM; | |
1088 | goto end; | |
1089 | } | |
1090 | ||
1091 | bt_message_discarded_events_set_count(*msg_out, count); | |
8ec4d5ff | 1092 | end: |
4164020e | 1093 | return status; |
8ec4d5ff JG |
1094 | } |
1095 | ||
4164020e SM |
1096 | static enum lttng_live_iterator_status |
1097 | handle_late_message(struct lttng_live_msg_iter *lttng_live_msg_iter, | |
1098 | struct lttng_live_stream_iterator *stream_iter, int64_t late_msg_ts_ns, | |
1099 | const bt_message *late_msg) | |
285951be | 1100 | { |
4164020e SM |
1101 | bt_self_component *self_comp = lttng_live_msg_iter->self_comp; |
1102 | bt_logging_level log_level = lttng_live_msg_iter->log_level; | |
1103 | const bt_clock_class *clock_class; | |
1104 | const bt_stream_class *stream_class; | |
1105 | enum bt_clock_class_cycles_to_ns_from_origin_status ts_ns_status; | |
1106 | int64_t last_inactivity_ts_ns; | |
1107 | enum lttng_live_iterator_status stream_iter_status = LTTNG_LIVE_ITERATOR_STATUS_OK; | |
1108 | enum lttng_live_iterator_status adjust_status; | |
1109 | bt_message *adjusted_message; | |
1110 | ||
1111 | /* | |
1112 | * The timestamp of the current message is before the last message sent | |
1113 | * by this component. We CANNOT send it as is. | |
1114 | * | |
1115 | * The only expected scenario in which that could happen is the | |
1116 | * following, everything else is a bug in this component, relay deamon, | |
1117 | * or CTF parser. | |
1118 | * | |
1119 | * Expected scenario: The CTF message iterator emitted discarded | |
1120 | * packets and discarded events with synthesized beginning and end | |
1121 | * timestamps from the bounds of the last known packet and the newly | |
1122 | * decoded packet header. The CTF message iterator is not aware of | |
1123 | * stream inactivity beacons. Hence, we have to adjust the beginning | |
1124 | * timestamp of those types of messages if a stream signalled its | |
1125 | * inactivity up until _after_ the last known packet's beginning | |
1126 | * timestamp. | |
1127 | * | |
1128 | * Otherwise, the monotonicity guarantee of message timestamps would | |
1129 | * not be preserved. | |
1130 | * | |
1131 | * In short, the only scenario in which it's okay and fixable to | |
1132 | * received a late message is when: | |
1133 | * 1. the late message is a discarded packets or discarded events | |
1134 | * message, | |
1135 | * 2. this stream produced an inactivity message downstream, and | |
1136 | * 3. the timestamp of the late message is within the inactivity | |
1137 | * timespan we sent downstream through the inactivity message. | |
1138 | */ | |
1139 | ||
1140 | BT_COMP_LOGD("Handling late message on live stream iterator: " | |
1141 | "stream-name=\"%s\", viewer-stream-id=%" PRIu64, | |
1142 | stream_iter->name->str, stream_iter->viewer_stream_id); | |
1143 | ||
1144 | if (!stream_iter->last_inactivity_ts.is_set) { | |
1145 | BT_COMP_LOGE_APPEND_CAUSE(self_comp, "Invalid live stream state: " | |
1146 | "have a late message when no inactivity message " | |
1147 | "was ever sent for that stream."); | |
1148 | stream_iter_status = LTTNG_LIVE_ITERATOR_STATUS_ERROR; | |
1149 | goto end; | |
1150 | } | |
1151 | ||
1152 | if (!is_discarded_packet_or_event_message(late_msg)) { | |
1153 | BT_COMP_LOGE_APPEND_CAUSE(self_comp, | |
1154 | "Invalid live stream state: " | |
1155 | "have a late message that is not a packet discarded or " | |
1156 | "event discarded message: late-msg-type=%s", | |
1157 | bt_common_message_type_string(bt_message_get_type(late_msg))); | |
1158 | stream_iter_status = LTTNG_LIVE_ITERATOR_STATUS_ERROR; | |
1159 | goto end; | |
1160 | } | |
1161 | ||
1162 | stream_class = bt_stream_borrow_class_const(stream_iter->stream); | |
1163 | clock_class = bt_stream_class_borrow_default_clock_class_const(stream_class); | |
1164 | ||
1165 | ts_ns_status = bt_clock_class_cycles_to_ns_from_origin( | |
1166 | clock_class, stream_iter->last_inactivity_ts.value, &last_inactivity_ts_ns); | |
1167 | if (ts_ns_status != BT_CLOCK_CLASS_CYCLES_TO_NS_FROM_ORIGIN_STATUS_OK) { | |
1168 | BT_COMP_LOGE_APPEND_CAUSE(self_comp, "Error converting last " | |
1169 | "inactivity message timestamp to nanoseconds"); | |
1170 | stream_iter_status = LTTNG_LIVE_ITERATOR_STATUS_ERROR; | |
1171 | goto end; | |
1172 | } | |
1173 | ||
1174 | if (last_inactivity_ts_ns <= late_msg_ts_ns) { | |
1175 | BT_COMP_LOGE_APPEND_CAUSE(self_comp, | |
1176 | "Invalid live stream state: " | |
1177 | "have a late message that is none included in a stream " | |
1178 | "inactivity timespan: last-inactivity-ts-ns=%" PRIu64 | |
1179 | "late-msg-ts-ns=%" PRIu64, | |
1180 | last_inactivity_ts_ns, late_msg_ts_ns); | |
1181 | stream_iter_status = LTTNG_LIVE_ITERATOR_STATUS_ERROR; | |
1182 | goto end; | |
1183 | } | |
1184 | ||
1185 | /* | |
1186 | * We now know that it's okay for this message to be late, we can now | |
1187 | * adjust its timestamp to ensure monotonicity. | |
1188 | */ | |
1189 | BT_COMP_LOGD("Adjusting the timestamp of late message: late-msg-type=%s, " | |
1190 | "msg-new-ts-ns=%" PRIu64, | |
1191 | bt_common_message_type_string(bt_message_get_type(late_msg)), | |
1192 | stream_iter->last_inactivity_ts.value); | |
1193 | switch (bt_message_get_type(late_msg)) { | |
1194 | case BT_MESSAGE_TYPE_DISCARDED_EVENTS: | |
1195 | adjust_status = adjust_discarded_events_message( | |
1196 | lttng_live_msg_iter->self_msg_iter, stream_iter->stream, late_msg, &adjusted_message, | |
1197 | stream_iter->last_inactivity_ts.value); | |
1198 | break; | |
1199 | case BT_MESSAGE_TYPE_DISCARDED_PACKETS: | |
1200 | adjust_status = adjust_discarded_packets_message( | |
1201 | lttng_live_msg_iter->self_msg_iter, stream_iter->stream, late_msg, &adjusted_message, | |
1202 | stream_iter->last_inactivity_ts.value); | |
1203 | break; | |
1204 | default: | |
1205 | bt_common_abort(); | |
1206 | } | |
1207 | ||
1208 | if (adjust_status != LTTNG_LIVE_ITERATOR_STATUS_OK) { | |
1209 | stream_iter_status = adjust_status; | |
1210 | goto end; | |
1211 | } | |
1212 | ||
1213 | BT_ASSERT_DBG(adjusted_message); | |
1214 | stream_iter->current_msg = adjusted_message; | |
1215 | stream_iter->current_msg_ts_ns = last_inactivity_ts_ns; | |
1216 | bt_message_put_ref(late_msg); | |
cefd84f8 | 1217 | |
285951be | 1218 | end: |
4164020e | 1219 | return stream_iter_status; |
285951be FD |
1220 | } |
1221 | ||
4164020e SM |
1222 | static enum lttng_live_iterator_status |
1223 | next_stream_iterator_for_trace(struct lttng_live_msg_iter *lttng_live_msg_iter, | |
1224 | struct lttng_live_trace *live_trace, | |
1225 | struct lttng_live_stream_iterator **youngest_trace_stream_iter) | |
7cdc2bab | 1226 | { |
4164020e SM |
1227 | struct lttng_live_stream_iterator *youngest_candidate_stream_iter = NULL; |
1228 | bt_logging_level log_level = lttng_live_msg_iter->log_level; | |
1229 | bt_self_component *self_comp = lttng_live_msg_iter->self_comp; | |
1230 | enum lttng_live_iterator_status stream_iter_status; | |
1231 | ; | |
1232 | int64_t youngest_candidate_msg_ts = INT64_MAX; | |
1233 | uint64_t stream_iter_idx; | |
1234 | ||
1235 | BT_ASSERT_DBG(live_trace); | |
1236 | BT_ASSERT_DBG(live_trace->stream_iterators); | |
1237 | ||
1238 | BT_COMP_LOGD("Finding the next stream iterator for trace: " | |
1239 | "trace-id=%" PRIu64, | |
1240 | live_trace->id); | |
1241 | /* | |
1242 | * Update the current message of every stream iterators of this trace. | |
1243 | * The current msg of every stream must have a timestamp equal or | |
1244 | * larger than the last message returned by this iterator. We must | |
1245 | * ensure monotonicity. | |
1246 | */ | |
1247 | stream_iter_idx = 0; | |
1248 | while (stream_iter_idx < live_trace->stream_iterators->len) { | |
1249 | bool stream_iter_is_ended = false; | |
1250 | struct lttng_live_stream_iterator *stream_iter = | |
1251 | (lttng_live_stream_iterator *) g_ptr_array_index(live_trace->stream_iterators, | |
1252 | stream_iter_idx); | |
1253 | ||
1254 | /* | |
1255 | * If there is no current message for this stream, go fetch | |
1256 | * one. | |
1257 | */ | |
1258 | while (!stream_iter->current_msg) { | |
1259 | const bt_message *msg = NULL; | |
1260 | int64_t curr_msg_ts_ns = INT64_MAX; | |
1261 | ||
1262 | stream_iter_status = | |
1263 | lttng_live_iterator_next_msg_on_stream(lttng_live_msg_iter, stream_iter, &msg); | |
1264 | ||
1265 | if (stream_iter_status == LTTNG_LIVE_ITERATOR_STATUS_END) { | |
1266 | stream_iter_is_ended = true; | |
1267 | break; | |
1268 | } | |
1269 | ||
1270 | if (stream_iter_status != LTTNG_LIVE_ITERATOR_STATUS_OK) { | |
1271 | goto end; | |
1272 | } | |
1273 | ||
1274 | BT_ASSERT_DBG(msg); | |
1275 | ||
1276 | BT_COMP_LOGD("Live stream iterator returned message: msg-type=%s, " | |
1277 | "stream-name=\"%s\", viewer-stream-id=%" PRIu64, | |
1278 | bt_common_message_type_string(bt_message_get_type(msg)), | |
1279 | stream_iter->name->str, stream_iter->viewer_stream_id); | |
1280 | ||
1281 | /* | |
1282 | * Get the timestamp in nanoseconds from origin of this | |
1283 | * messsage. | |
1284 | */ | |
1285 | live_get_msg_ts_ns(stream_iter, lttng_live_msg_iter, msg, | |
1286 | lttng_live_msg_iter->last_msg_ts_ns, &curr_msg_ts_ns); | |
1287 | ||
1288 | /* | |
1289 | * Check if the message of the current live stream | |
1290 | * iterator occurred at the exact same time or after the | |
1291 | * last message returned by this component's message | |
1292 | * iterator. If not, we need to handle it with care. | |
1293 | */ | |
1294 | if (curr_msg_ts_ns >= lttng_live_msg_iter->last_msg_ts_ns) { | |
1295 | stream_iter->current_msg = msg; | |
1296 | stream_iter->current_msg_ts_ns = curr_msg_ts_ns; | |
1297 | } else { | |
1298 | /* | |
1299 | * We received a message from the past. This | |
1300 | * may be fixable but it can also be an error. | |
1301 | */ | |
1302 | stream_iter_status = | |
1303 | handle_late_message(lttng_live_msg_iter, stream_iter, curr_msg_ts_ns, msg); | |
1304 | if (stream_iter_status != LTTNG_LIVE_ITERATOR_STATUS_OK) { | |
1305 | BT_COMP_LOGE_APPEND_CAUSE(self_comp, | |
1306 | "Late message could not be handled correctly: " | |
1307 | "lttng-live-msg-iter-addr=%p, " | |
1308 | "stream-name=\"%s\", " | |
1309 | "curr-msg-ts=%" PRId64 ", last-msg-ts=%" PRId64, | |
1310 | lttng_live_msg_iter, stream_iter->name->str, | |
1311 | curr_msg_ts_ns, lttng_live_msg_iter->last_msg_ts_ns); | |
1312 | stream_iter_status = LTTNG_LIVE_ITERATOR_STATUS_ERROR; | |
1313 | goto end; | |
1314 | } | |
1315 | } | |
1316 | } | |
1317 | ||
1318 | BT_ASSERT_DBG(stream_iter != youngest_candidate_stream_iter); | |
1319 | ||
1320 | if (!stream_iter_is_ended) { | |
1321 | if (G_UNLIKELY(youngest_candidate_stream_iter == NULL) || | |
1322 | stream_iter->current_msg_ts_ns < youngest_candidate_msg_ts) { | |
1323 | /* | |
1324 | * Update the current best candidate message | |
1325 | * for the stream iterator of this live trace | |
1326 | * to be forwarded downstream. | |
1327 | */ | |
1328 | youngest_candidate_msg_ts = stream_iter->current_msg_ts_ns; | |
1329 | youngest_candidate_stream_iter = stream_iter; | |
1330 | } else if (stream_iter->current_msg_ts_ns == youngest_candidate_msg_ts) { | |
1331 | /* | |
1332 | * Order the messages in an arbitrary but | |
1333 | * deterministic way. | |
1334 | */ | |
1335 | BT_ASSERT_DBG(stream_iter != youngest_candidate_stream_iter); | |
1336 | int ret = common_muxing_compare_messages( | |
1337 | stream_iter->current_msg, youngest_candidate_stream_iter->current_msg); | |
1338 | if (ret < 0) { | |
1339 | /* | |
1340 | * The `youngest_candidate_stream_iter->current_msg` | |
1341 | * should go first. Update the next | |
1342 | * iterator and the current timestamp. | |
1343 | */ | |
1344 | youngest_candidate_msg_ts = stream_iter->current_msg_ts_ns; | |
1345 | youngest_candidate_stream_iter = stream_iter; | |
1346 | } else if (ret == 0) { | |
1347 | /* | |
1348 | * Unable to pick which one should go | |
1349 | * first. | |
1350 | */ | |
1351 | BT_COMP_LOGW( | |
1352 | "Cannot deterministically pick next live stream message iterator because they have identical next messages: " | |
1353 | "stream-iter-addr=%p" | |
1354 | "stream-iter-addr=%p", | |
1355 | stream_iter, youngest_candidate_stream_iter); | |
1356 | } | |
1357 | } | |
1358 | ||
1359 | stream_iter_idx++; | |
1360 | } else { | |
1361 | /* | |
1362 | * The live stream iterator has ended. That | |
1363 | * iterator is removed from the array, but | |
1364 | * there is no need to increment | |
1365 | * stream_iter_idx as | |
1366 | * g_ptr_array_remove_index_fast replaces the | |
1367 | * removed element with the array's last | |
1368 | * element. | |
1369 | */ | |
1370 | g_ptr_array_remove_index_fast(live_trace->stream_iterators, stream_iter_idx); | |
1371 | } | |
1372 | } | |
1373 | ||
1374 | if (youngest_candidate_stream_iter) { | |
1375 | *youngest_trace_stream_iter = youngest_candidate_stream_iter; | |
1376 | stream_iter_status = LTTNG_LIVE_ITERATOR_STATUS_OK; | |
1377 | } else { | |
1378 | /* | |
1379 | * The only case where we don't have a candidate for this trace | |
1380 | * is if we reached the end of all the iterators. | |
1381 | */ | |
1382 | BT_ASSERT(live_trace->stream_iterators->len == 0); | |
1383 | stream_iter_status = LTTNG_LIVE_ITERATOR_STATUS_END; | |
1384 | } | |
14f28187 FD |
1385 | |
1386 | end: | |
4164020e | 1387 | return stream_iter_status; |
14f28187 FD |
1388 | } |
1389 | ||
4164020e SM |
1390 | static enum lttng_live_iterator_status |
1391 | next_stream_iterator_for_session(struct lttng_live_msg_iter *lttng_live_msg_iter, | |
1392 | struct lttng_live_session *session, | |
1393 | struct lttng_live_stream_iterator **youngest_session_stream_iter) | |
14f28187 | 1394 | { |
4164020e SM |
1395 | bt_self_component *self_comp = lttng_live_msg_iter->self_comp; |
1396 | bt_logging_level log_level = lttng_live_msg_iter->log_level; | |
1397 | enum lttng_live_iterator_status stream_iter_status; | |
1398 | uint64_t trace_idx = 0; | |
1399 | int64_t youngest_candidate_msg_ts = INT64_MAX; | |
1400 | struct lttng_live_stream_iterator *youngest_candidate_stream_iter = NULL; | |
1401 | ||
1402 | BT_COMP_LOGD("Finding the next stream iterator for session: " | |
1403 | "session-id=%" PRIu64, | |
1404 | session->id); | |
1405 | /* | |
1406 | * Make sure we are attached to the session and look for new streams | |
1407 | * and metadata. | |
1408 | */ | |
1409 | stream_iter_status = lttng_live_get_session(lttng_live_msg_iter, session); | |
1410 | if (stream_iter_status != LTTNG_LIVE_ITERATOR_STATUS_OK && | |
1411 | stream_iter_status != LTTNG_LIVE_ITERATOR_STATUS_CONTINUE && | |
1412 | stream_iter_status != LTTNG_LIVE_ITERATOR_STATUS_END) { | |
1413 | goto end; | |
1414 | } | |
1415 | ||
1416 | BT_ASSERT_DBG(session->traces); | |
1417 | ||
1418 | while (trace_idx < session->traces->len) { | |
1419 | bool trace_is_ended = false; | |
1420 | struct lttng_live_stream_iterator *stream_iter; | |
1421 | struct lttng_live_trace *trace = | |
1422 | (lttng_live_trace *) g_ptr_array_index(session->traces, trace_idx); | |
1423 | ||
1424 | stream_iter_status = | |
1425 | next_stream_iterator_for_trace(lttng_live_msg_iter, trace, &stream_iter); | |
1426 | if (stream_iter_status == LTTNG_LIVE_ITERATOR_STATUS_END) { | |
1427 | /* | |
1428 | * All the live stream iterators for this trace are | |
1429 | * ENDed. Remove the trace from this session. | |
1430 | */ | |
1431 | trace_is_ended = true; | |
1432 | } else if (stream_iter_status != LTTNG_LIVE_ITERATOR_STATUS_OK) { | |
1433 | goto end; | |
1434 | } | |
1435 | ||
1436 | if (!trace_is_ended) { | |
1437 | BT_ASSERT_DBG(stream_iter); | |
1438 | ||
1439 | if (G_UNLIKELY(youngest_candidate_stream_iter == NULL) || | |
1440 | stream_iter->current_msg_ts_ns < youngest_candidate_msg_ts) { | |
1441 | youngest_candidate_msg_ts = stream_iter->current_msg_ts_ns; | |
1442 | youngest_candidate_stream_iter = stream_iter; | |
1443 | } else if (stream_iter->current_msg_ts_ns == youngest_candidate_msg_ts) { | |
1444 | /* | |
1445 | * Order the messages in an arbitrary but | |
1446 | * deterministic way. | |
1447 | */ | |
1448 | int ret = common_muxing_compare_messages( | |
1449 | stream_iter->current_msg, youngest_candidate_stream_iter->current_msg); | |
1450 | if (ret < 0) { | |
1451 | /* | |
1452 | * The `youngest_candidate_stream_iter->current_msg` | |
1453 | * should go first. Update the next iterator | |
1454 | * and the current timestamp. | |
1455 | */ | |
1456 | youngest_candidate_msg_ts = stream_iter->current_msg_ts_ns; | |
1457 | youngest_candidate_stream_iter = stream_iter; | |
1458 | } else if (ret == 0) { | |
1459 | /* Unable to pick which one should go first. */ | |
1460 | BT_COMP_LOGW( | |
1461 | "Cannot deterministically pick next live stream message iterator because they have identical next messages: " | |
1462 | "stream-iter-addr=%p" | |
1463 | "stream-iter-addr=%p", | |
1464 | stream_iter, youngest_candidate_stream_iter); | |
1465 | } | |
1466 | } | |
1467 | trace_idx++; | |
1468 | } else { | |
1469 | /* | |
1470 | * trace_idx is not incremented since | |
1471 | * g_ptr_array_remove_index_fast replaces the | |
1472 | * element at trace_idx with the array's last element. | |
1473 | */ | |
1474 | g_ptr_array_remove_index_fast(session->traces, trace_idx); | |
1475 | } | |
1476 | } | |
1477 | if (youngest_candidate_stream_iter) { | |
1478 | *youngest_session_stream_iter = youngest_candidate_stream_iter; | |
1479 | stream_iter_status = LTTNG_LIVE_ITERATOR_STATUS_OK; | |
1480 | } else { | |
1481 | /* | |
1482 | * The only cases where we don't have a candidate for this | |
1483 | * trace is: | |
1484 | * 1. if we reached the end of all the iterators of all the | |
1485 | * traces of this session, | |
1486 | * 2. if we never had live stream iterator in the first place. | |
1487 | * | |
1488 | * In either cases, we return END. | |
1489 | */ | |
1490 | BT_ASSERT(session->traces->len == 0); | |
1491 | stream_iter_status = LTTNG_LIVE_ITERATOR_STATUS_END; | |
1492 | } | |
7cdc2bab | 1493 | end: |
4164020e | 1494 | return stream_iter_status; |
14f28187 FD |
1495 | } |
1496 | ||
4164020e | 1497 | static inline void put_messages(bt_message_array_const msgs, uint64_t count) |
14f28187 | 1498 | { |
4164020e | 1499 | uint64_t i; |
14f28187 | 1500 | |
4164020e SM |
1501 | for (i = 0; i < count; i++) { |
1502 | BT_MESSAGE_PUT_REF_AND_RESET(msgs[i]); | |
1503 | } | |
7cdc2bab MD |
1504 | } |
1505 | ||
4164020e SM |
1506 | bt_message_iterator_class_next_method_status |
1507 | lttng_live_msg_iter_next(bt_self_message_iterator *self_msg_it, bt_message_array_const msgs, | |
1508 | uint64_t capacity, uint64_t *count) | |
d3eb6e8f | 1509 | { |
4164020e SM |
1510 | bt_message_iterator_class_next_method_status status; |
1511 | enum lttng_live_viewer_status viewer_status; | |
1512 | struct lttng_live_msg_iter *lttng_live_msg_iter = | |
1513 | (struct lttng_live_msg_iter *) bt_self_message_iterator_get_data(self_msg_it); | |
1514 | struct lttng_live_component *lttng_live = lttng_live_msg_iter->lttng_live_comp; | |
1515 | bt_self_component *self_comp = lttng_live_msg_iter->self_comp; | |
1516 | bt_logging_level log_level = lttng_live_msg_iter->log_level; | |
1517 | enum lttng_live_iterator_status stream_iter_status; | |
1518 | uint64_t session_idx; | |
1519 | ||
1520 | *count = 0; | |
1521 | ||
1522 | BT_ASSERT_DBG(lttng_live_msg_iter); | |
1523 | ||
1524 | if (G_UNLIKELY(lttng_live_msg_iter->was_interrupted)) { | |
1525 | /* | |
1526 | * The iterator was interrupted in a previous call to the | |
1527 | * `_next()` method. We currently do not support generating | |
1528 | * messages after such event. The babeltrace2 CLI should never | |
1529 | * be running the graph after being interrupted. So this check | |
1530 | * is to prevent other graph users from using this live | |
1531 | * iterator in an messed up internal state. | |
1532 | */ | |
1533 | status = BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_ERROR; | |
1534 | BT_COMP_LOGE_APPEND_CAUSE( | |
1535 | self_comp, | |
1536 | "Message iterator was interrupted during a previous call to the `next()` and currently does not support continuing after such event."); | |
1537 | goto end; | |
1538 | } | |
1539 | ||
1540 | /* | |
1541 | * Clear all the invalid message reference that might be left over in | |
1542 | * the output array. | |
1543 | */ | |
1544 | memset(msgs, 0, capacity * sizeof(*msgs)); | |
1545 | ||
1546 | /* | |
1547 | * If no session are exposed on the relay found at the url provided by | |
1548 | * the user, session count will be 0. In this case, we return status | |
1549 | * end to return gracefully. | |
1550 | */ | |
1551 | if (lttng_live_msg_iter->sessions->len == 0) { | |
1552 | if (lttng_live->params.sess_not_found_act != SESSION_NOT_FOUND_ACTION_CONTINUE) { | |
1553 | status = BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_END; | |
1554 | goto end; | |
1555 | } else { | |
1556 | /* | |
1557 | * The are no more active session for this session | |
1558 | * name. Retry to create a viewer session for the | |
1559 | * requested session name. | |
1560 | */ | |
1561 | viewer_status = lttng_live_create_viewer_session(lttng_live_msg_iter); | |
1562 | if (viewer_status != LTTNG_LIVE_VIEWER_STATUS_OK) { | |
1563 | if (viewer_status == LTTNG_LIVE_VIEWER_STATUS_ERROR) { | |
1564 | status = BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_ERROR; | |
1565 | BT_COMP_LOGE_APPEND_CAUSE(self_comp, | |
1566 | "Error creating LTTng live viewer session"); | |
1567 | } else if (viewer_status == LTTNG_LIVE_VIEWER_STATUS_INTERRUPTED) { | |
1568 | status = BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_AGAIN; | |
1569 | } else { | |
1570 | bt_common_abort(); | |
1571 | } | |
1572 | goto end; | |
1573 | } | |
1574 | } | |
1575 | } | |
1576 | ||
1577 | if (lttng_live_msg_iter->active_stream_iter == 0) { | |
1578 | lttng_live_force_new_streams_and_metadata(lttng_live_msg_iter); | |
1579 | } | |
1580 | ||
1581 | /* | |
1582 | * Here the muxing of message is done. | |
1583 | * | |
1584 | * We need to iterate over all the streams of all the traces of all the | |
1585 | * viewer sessions in order to get the message with the smallest | |
1586 | * timestamp. In this case, a session is a viewer session and there is | |
1587 | * one viewer session per consumer daemon. (UST 32bit, UST 64bit and/or | |
1588 | * kernel). Each viewer session can have multiple traces, for example, | |
1589 | * 64bit UST viewer sessions could have multiple per-pid traces. | |
1590 | * | |
1591 | * We iterate over the streams of each traces to update and see what is | |
1592 | * their next message's timestamp. From those timestamps, we select the | |
1593 | * message with the smallest timestamp as the best candidate message | |
1594 | * for that trace and do the same thing across all the sessions. | |
1595 | * | |
1596 | * We then compare the timestamp of best candidate message of all the | |
1597 | * sessions to pick the message with the smallest timestamp and we | |
1598 | * return it. | |
1599 | */ | |
1600 | while (*count < capacity) { | |
1601 | struct lttng_live_stream_iterator *youngest_stream_iter = NULL, | |
1602 | *candidate_stream_iter = NULL; | |
1603 | int64_t youngest_msg_ts_ns = INT64_MAX; | |
1604 | ||
1605 | BT_ASSERT_DBG(lttng_live_msg_iter->sessions); | |
1606 | session_idx = 0; | |
1607 | while (session_idx < lttng_live_msg_iter->sessions->len) { | |
1608 | struct lttng_live_session *session = (lttng_live_session *) g_ptr_array_index( | |
1609 | lttng_live_msg_iter->sessions, session_idx); | |
1610 | ||
1611 | /* Find the best candidate message to send downstream. */ | |
1612 | stream_iter_status = next_stream_iterator_for_session(lttng_live_msg_iter, session, | |
1613 | &candidate_stream_iter); | |
1614 | ||
1615 | /* If we receive an END status, it means that either: | |
1616 | * - Those traces never had active streams (UST with no | |
1617 | * data produced yet), | |
1618 | * - All live stream iterators have ENDed.*/ | |
1619 | if (stream_iter_status == LTTNG_LIVE_ITERATOR_STATUS_END) { | |
1620 | if (session->closed && session->traces->len == 0) { | |
1621 | /* | |
1622 | * Remove the session from the list. | |
1623 | * session_idx is not modified since | |
1624 | * g_ptr_array_remove_index_fast | |
1625 | * replaces the the removed element with | |
1626 | * the array's last element. | |
1627 | */ | |
1628 | g_ptr_array_remove_index_fast(lttng_live_msg_iter->sessions, session_idx); | |
1629 | } else { | |
1630 | session_idx++; | |
1631 | } | |
1632 | continue; | |
1633 | } | |
1634 | ||
1635 | if (stream_iter_status != LTTNG_LIVE_ITERATOR_STATUS_OK) { | |
1636 | goto return_status; | |
1637 | } | |
1638 | ||
1639 | if (G_UNLIKELY(youngest_stream_iter == NULL) || | |
1640 | candidate_stream_iter->current_msg_ts_ns < youngest_msg_ts_ns) { | |
1641 | youngest_msg_ts_ns = candidate_stream_iter->current_msg_ts_ns; | |
1642 | youngest_stream_iter = candidate_stream_iter; | |
1643 | } else if (candidate_stream_iter->current_msg_ts_ns == youngest_msg_ts_ns) { | |
1644 | /* | |
1645 | * The currently selected message to be sent | |
1646 | * downstream next has the exact same timestamp | |
1647 | * that of the current candidate message. We | |
1648 | * must break the tie in a predictable manner. | |
1649 | */ | |
1650 | BT_COMP_LOGD_STR( | |
1651 | "Two of the next message candidates have the same timestamps, pick one deterministically."); | |
1652 | /* | |
1653 | * Order the messages in an arbitrary but | |
1654 | * deterministic way. | |
1655 | */ | |
1656 | int ret = common_muxing_compare_messages(candidate_stream_iter->current_msg, | |
1657 | youngest_stream_iter->current_msg); | |
1658 | if (ret < 0) { | |
1659 | /* | |
1660 | * The `candidate_stream_iter->current_msg` | |
1661 | * should go first. Update the next | |
1662 | * iterator and the current timestamp. | |
1663 | */ | |
1664 | youngest_msg_ts_ns = candidate_stream_iter->current_msg_ts_ns; | |
1665 | youngest_stream_iter = candidate_stream_iter; | |
1666 | } else if (ret == 0) { | |
1667 | /* Unable to pick which one should go first. */ | |
1668 | BT_COMP_LOGW( | |
1669 | "Cannot deterministically pick next live stream message iterator because they have identical next messages: " | |
1670 | "next-stream-iter-addr=%p" | |
1671 | "candidate-stream-iter-addr=%p", | |
1672 | youngest_stream_iter, candidate_stream_iter); | |
1673 | } | |
1674 | } | |
1675 | ||
1676 | session_idx++; | |
1677 | } | |
1678 | ||
1679 | if (!youngest_stream_iter) { | |
1680 | stream_iter_status = LTTNG_LIVE_ITERATOR_STATUS_AGAIN; | |
1681 | goto return_status; | |
1682 | } | |
1683 | ||
1684 | BT_ASSERT_DBG(youngest_stream_iter->current_msg); | |
1685 | /* Ensure monotonicity. */ | |
1686 | BT_ASSERT_DBG(lttng_live_msg_iter->last_msg_ts_ns <= | |
1687 | youngest_stream_iter->current_msg_ts_ns); | |
1688 | ||
1689 | /* | |
1690 | * Insert the next message to the message batch. This will set | |
1691 | * stream iterator current messsage to NULL so that next time | |
1692 | * we fetch the next message of that stream iterator | |
1693 | */ | |
1694 | BT_MESSAGE_MOVE_REF(msgs[*count], youngest_stream_iter->current_msg); | |
1695 | (*count)++; | |
1696 | ||
1697 | /* Update the last timestamp in nanoseconds sent downstream. */ | |
1698 | lttng_live_msg_iter->last_msg_ts_ns = youngest_msg_ts_ns; | |
1699 | youngest_stream_iter->current_msg_ts_ns = INT64_MAX; | |
1700 | ||
1701 | stream_iter_status = LTTNG_LIVE_ITERATOR_STATUS_OK; | |
1702 | } | |
f79c2d7a FD |
1703 | |
1704 | return_status: | |
4164020e SM |
1705 | switch (stream_iter_status) { |
1706 | case LTTNG_LIVE_ITERATOR_STATUS_OK: | |
1707 | case LTTNG_LIVE_ITERATOR_STATUS_AGAIN: | |
1708 | /* | |
1709 | * If we gathered messages, return _OK even if the graph was | |
1710 | * interrupted. This allows for the components downstream to at | |
1711 | * least get the thoses messages. If the graph was indeed | |
1712 | * interrupted there should not be another _next() call as the | |
1713 | * application will tear down the graph. This component class | |
1714 | * doesn't support restarting after an interruption. | |
1715 | */ | |
1716 | if (*count > 0) { | |
1717 | status = BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_OK; | |
1718 | } else { | |
1719 | status = BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_AGAIN; | |
1720 | } | |
1721 | break; | |
1722 | case LTTNG_LIVE_ITERATOR_STATUS_END: | |
1723 | status = BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_END; | |
1724 | break; | |
1725 | case LTTNG_LIVE_ITERATOR_STATUS_NOMEM: | |
1726 | BT_COMP_LOGE_APPEND_CAUSE(self_comp, | |
1727 | "Memory error preparing the next batch of messages: " | |
1728 | "live-iter-status=%s", | |
1729 | lttng_live_iterator_status_string(stream_iter_status)); | |
1730 | status = BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_MEMORY_ERROR; | |
1731 | break; | |
1732 | case LTTNG_LIVE_ITERATOR_STATUS_ERROR: | |
1733 | case LTTNG_LIVE_ITERATOR_STATUS_INVAL: | |
1734 | case LTTNG_LIVE_ITERATOR_STATUS_UNSUPPORTED: | |
1735 | BT_COMP_LOGE_APPEND_CAUSE(self_comp, | |
1736 | "Error preparing the next batch of messages: " | |
1737 | "live-iter-status=%s", | |
1738 | lttng_live_iterator_status_string(stream_iter_status)); | |
1739 | ||
1740 | status = BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_ERROR; | |
1741 | /* Put all existing messages on error. */ | |
1742 | put_messages(msgs, *count); | |
1743 | break; | |
1744 | default: | |
1745 | bt_common_abort(); | |
1746 | } | |
14f28187 | 1747 | |
f79c2d7a | 1748 | end: |
4164020e | 1749 | return status; |
7cdc2bab | 1750 | } |
41a2b7ae | 1751 | |
4164020e SM |
1752 | static struct lttng_live_msg_iter * |
1753 | lttng_live_msg_iter_create(struct lttng_live_component *lttng_live_comp, | |
1754 | bt_self_message_iterator *self_msg_it) | |
4f74db52 | 1755 | { |
4164020e SM |
1756 | bt_self_component *self_comp = lttng_live_comp->self_comp; |
1757 | bt_logging_level log_level = lttng_live_comp->log_level; | |
4f74db52 | 1758 | |
4164020e SM |
1759 | struct lttng_live_msg_iter *lttng_live_msg_iter = g_new0(struct lttng_live_msg_iter, 1); |
1760 | if (!lttng_live_msg_iter) { | |
1761 | BT_COMP_LOGE_APPEND_CAUSE(self_comp, "Failed to allocate lttng_live_msg_iter"); | |
1762 | goto end; | |
1763 | } | |
1764 | ||
1765 | lttng_live_msg_iter->log_level = lttng_live_comp->log_level; | |
1766 | lttng_live_msg_iter->self_comp = lttng_live_comp->self_comp; | |
1767 | lttng_live_msg_iter->lttng_live_comp = lttng_live_comp; | |
1768 | lttng_live_msg_iter->self_msg_iter = self_msg_it; | |
1769 | ||
1770 | lttng_live_msg_iter->active_stream_iter = 0; | |
1771 | lttng_live_msg_iter->last_msg_ts_ns = INT64_MIN; | |
1772 | lttng_live_msg_iter->was_interrupted = false; | |
4f74db52 | 1773 | |
4164020e SM |
1774 | lttng_live_msg_iter->sessions = |
1775 | g_ptr_array_new_with_free_func((GDestroyNotify) lttng_live_destroy_session); | |
1776 | BT_ASSERT(lttng_live_msg_iter->sessions); | |
1777 | ||
1778 | end: | |
1779 | return lttng_live_msg_iter; | |
4f74db52 FD |
1780 | } |
1781 | ||
4164020e SM |
1782 | bt_message_iterator_class_initialize_method_status |
1783 | lttng_live_msg_iter_init(bt_self_message_iterator *self_msg_it, | |
ecd7492f MJ |
1784 | bt_self_message_iterator_configuration *, |
1785 | bt_self_component_port_output *) | |
7cdc2bab | 1786 | { |
4164020e SM |
1787 | bt_message_iterator_class_initialize_method_status status; |
1788 | struct lttng_live_component *lttng_live; | |
1789 | struct lttng_live_msg_iter *lttng_live_msg_iter; | |
1790 | enum lttng_live_viewer_status viewer_status; | |
1791 | bt_logging_level log_level; | |
1792 | bt_self_component *self_comp = bt_self_message_iterator_borrow_component(self_msg_it); | |
1793 | ||
1794 | lttng_live = (lttng_live_component *) bt_self_component_get_data(self_comp); | |
1795 | log_level = lttng_live->log_level; | |
1796 | self_comp = lttng_live->self_comp; | |
1797 | ||
1798 | /* There can be only one downstream iterator at the same time. */ | |
1799 | BT_ASSERT(!lttng_live->has_msg_iter); | |
1800 | lttng_live->has_msg_iter = true; | |
1801 | ||
1802 | lttng_live_msg_iter = lttng_live_msg_iter_create(lttng_live, self_msg_it); | |
1803 | if (!lttng_live_msg_iter) { | |
4164020e | 1804 | BT_COMP_LOGE_APPEND_CAUSE(self_comp, "Failed to create lttng_live_msg_iter"); |
10265ebe | 1805 | status = BT_MESSAGE_ITERATOR_CLASS_INITIALIZE_METHOD_STATUS_MEMORY_ERROR; |
4164020e SM |
1806 | goto error; |
1807 | } | |
1808 | ||
1809 | viewer_status = live_viewer_connection_create( | |
1810 | self_comp, NULL, log_level, lttng_live->params.url->str, false, lttng_live_msg_iter, | |
1811 | <tng_live_msg_iter->viewer_connection); | |
1812 | if (viewer_status != LTTNG_LIVE_VIEWER_STATUS_OK) { | |
1813 | if (viewer_status == LTTNG_LIVE_VIEWER_STATUS_ERROR) { | |
1814 | BT_COMP_LOGE_APPEND_CAUSE(self_comp, "Failed to create viewer connection"); | |
1815 | } else if (viewer_status == LTTNG_LIVE_VIEWER_STATUS_INTERRUPTED) { | |
1816 | /* | |
1817 | * Interruption in the _iter_init() method is not | |
1818 | * supported. Return an error. | |
1819 | */ | |
1820 | BT_COMP_LOGE_APPEND_CAUSE(self_comp, "Interrupted while creating viewer connection"); | |
1821 | } | |
10265ebe SM |
1822 | |
1823 | status = BT_MESSAGE_ITERATOR_CLASS_INITIALIZE_METHOD_STATUS_ERROR; | |
4164020e SM |
1824 | goto error; |
1825 | } | |
1826 | ||
1827 | viewer_status = lttng_live_create_viewer_session(lttng_live_msg_iter); | |
1828 | if (viewer_status != LTTNG_LIVE_VIEWER_STATUS_OK) { | |
1829 | if (viewer_status == LTTNG_LIVE_VIEWER_STATUS_ERROR) { | |
1830 | BT_COMP_LOGE_APPEND_CAUSE(self_comp, "Failed to create viewer session"); | |
1831 | } else if (viewer_status == LTTNG_LIVE_VIEWER_STATUS_INTERRUPTED) { | |
1832 | /* | |
1833 | * Interruption in the _iter_init() method is not | |
1834 | * supported. Return an error. | |
1835 | */ | |
1836 | BT_COMP_LOGE_APPEND_CAUSE(self_comp, "Interrupted when creating viewer session"); | |
1837 | } | |
10265ebe SM |
1838 | |
1839 | status = BT_MESSAGE_ITERATOR_CLASS_INITIALIZE_METHOD_STATUS_ERROR; | |
4164020e SM |
1840 | goto error; |
1841 | } | |
1842 | ||
1843 | if (lttng_live_msg_iter->sessions->len == 0) { | |
1844 | switch (lttng_live->params.sess_not_found_act) { | |
1845 | case SESSION_NOT_FOUND_ACTION_CONTINUE: | |
1846 | BT_COMP_LOGI( | |
1847 | "Unable to connect to the requested live viewer session. Keep trying to connect because of " | |
1848 | "%s=\"%s\" component parameter: url=\"%s\"", | |
1849 | SESS_NOT_FOUND_ACTION_PARAM, SESS_NOT_FOUND_ACTION_CONTINUE_STR, | |
1850 | lttng_live->params.url->str); | |
1851 | break; | |
1852 | case SESSION_NOT_FOUND_ACTION_FAIL: | |
1853 | BT_COMP_LOGE_APPEND_CAUSE( | |
1854 | self_comp, | |
1855 | "Unable to connect to the requested live viewer session. Fail the message iterator initialization because of %s=\"%s\" " | |
1856 | "component parameter: url =\"%s\"", | |
1857 | SESS_NOT_FOUND_ACTION_PARAM, SESS_NOT_FOUND_ACTION_FAIL_STR, | |
1858 | lttng_live->params.url->str); | |
10265ebe | 1859 | status = BT_MESSAGE_ITERATOR_CLASS_INITIALIZE_METHOD_STATUS_ERROR; |
4164020e SM |
1860 | goto error; |
1861 | case SESSION_NOT_FOUND_ACTION_END: | |
1862 | BT_COMP_LOGI( | |
1863 | "Unable to connect to the requested live viewer session. End gracefully at the first _next() " | |
1864 | "call because of %s=\"%s\" component parameter: " | |
1865 | "url=\"%s\"", | |
1866 | SESS_NOT_FOUND_ACTION_PARAM, SESS_NOT_FOUND_ACTION_END_STR, | |
1867 | lttng_live->params.url->str); | |
1868 | break; | |
1869 | default: | |
1870 | bt_common_abort(); | |
1871 | } | |
1872 | } | |
1873 | ||
1874 | bt_self_message_iterator_set_data(self_msg_it, lttng_live_msg_iter); | |
1875 | status = BT_MESSAGE_ITERATOR_CLASS_INITIALIZE_METHOD_STATUS_OK; | |
1876 | goto end; | |
f79c2d7a | 1877 | |
14f28187 | 1878 | error: |
4164020e | 1879 | lttng_live_msg_iter_destroy(lttng_live_msg_iter); |
7cdc2bab | 1880 | end: |
4164020e | 1881 | return status; |
7cdc2bab MD |
1882 | } |
1883 | ||
80aff5ef | 1884 | static struct bt_param_validation_map_value_entry_descr list_sessions_params[] = { |
88730e42 SM |
1885 | {URL_PARAM, BT_PARAM_VALIDATION_MAP_VALUE_ENTRY_MANDATORY, |
1886 | bt_param_validation_value_descr::makeString()}, | |
4164020e SM |
1887 | BT_PARAM_VALIDATION_MAP_VALUE_ENTRY_END}; |
1888 | ||
1889 | static bt_component_class_query_method_status | |
1890 | lttng_live_query_list_sessions(const bt_value *params, const bt_value **result, | |
1891 | bt_self_component_class *self_comp_class, bt_logging_level log_level) | |
7cdc2bab | 1892 | { |
4164020e SM |
1893 | bt_component_class_query_method_status status; |
1894 | const bt_value *url_value = NULL; | |
1895 | const char *url; | |
1896 | struct live_viewer_connection *viewer_connection = NULL; | |
1897 | enum lttng_live_viewer_status viewer_status; | |
1898 | enum bt_param_validation_status validation_status; | |
1899 | gchar *validate_error = NULL; | |
1900 | ||
1901 | validation_status = bt_param_validation_validate(params, list_sessions_params, &validate_error); | |
1902 | if (validation_status == BT_PARAM_VALIDATION_STATUS_MEMORY_ERROR) { | |
1903 | status = BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_MEMORY_ERROR; | |
1904 | goto error; | |
1905 | } else if (validation_status == BT_PARAM_VALIDATION_STATUS_VALIDATION_ERROR) { | |
1906 | status = BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_ERROR; | |
1907 | BT_COMP_CLASS_LOGE_APPEND_CAUSE(self_comp_class, "%s", validate_error); | |
1908 | goto error; | |
1909 | } | |
1910 | ||
1911 | url_value = bt_value_map_borrow_entry_value_const(params, URL_PARAM); | |
1912 | url = bt_value_string_get(url_value); | |
1913 | ||
1914 | viewer_status = live_viewer_connection_create(NULL, self_comp_class, log_level, url, true, NULL, | |
1915 | &viewer_connection); | |
1916 | if (viewer_status != LTTNG_LIVE_VIEWER_STATUS_OK) { | |
1917 | if (viewer_status == LTTNG_LIVE_VIEWER_STATUS_ERROR) { | |
1918 | BT_COMP_CLASS_LOGE_APPEND_CAUSE(self_comp_class, "Failed to create viewer connection"); | |
1919 | status = BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_ERROR; | |
1920 | } else if (viewer_status == LTTNG_LIVE_VIEWER_STATUS_INTERRUPTED) { | |
1921 | status = BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_AGAIN; | |
1922 | } else { | |
1923 | bt_common_abort(); | |
1924 | } | |
1925 | goto error; | |
1926 | } | |
1927 | ||
1928 | status = live_viewer_connection_list_sessions(viewer_connection, result); | |
1929 | if (status != BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_OK) { | |
1930 | BT_COMP_CLASS_LOGE_APPEND_CAUSE(self_comp_class, "Failed to list viewer sessions"); | |
1931 | goto error; | |
1932 | } | |
1933 | ||
1934 | goto end; | |
c7eee084 | 1935 | |
7cdc2bab | 1936 | error: |
4164020e | 1937 | BT_VALUE_PUT_REF_AND_RESET(*result); |
c7eee084 | 1938 | |
4164020e SM |
1939 | if (status >= 0) { |
1940 | status = BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_ERROR; | |
1941 | } | |
c7eee084 | 1942 | |
7cdc2bab | 1943 | end: |
4164020e SM |
1944 | if (viewer_connection) { |
1945 | live_viewer_connection_destroy(viewer_connection); | |
1946 | } | |
80aff5ef | 1947 | |
4164020e | 1948 | g_free(validate_error); |
80aff5ef | 1949 | |
4164020e | 1950 | return status; |
7cdc2bab MD |
1951 | } |
1952 | ||
4164020e SM |
1953 | static bt_component_class_query_method_status |
1954 | lttng_live_query_support_info(const bt_value *params, const bt_value **result, | |
1955 | bt_self_component_class *self_comp_class, bt_logging_level log_level) | |
312df793 | 1956 | { |
4164020e SM |
1957 | bt_component_class_query_method_status status = BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_OK; |
1958 | const bt_value *input_type_value; | |
1959 | const bt_value *input_value; | |
1960 | double weight = 0; | |
dd420a9b | 1961 | struct bt_common_lttng_live_url_parts parts = {}; |
4164020e SM |
1962 | |
1963 | /* Used by the logging macros */ | |
1964 | __attribute__((unused)) bt_self_component *self_comp = NULL; | |
1965 | ||
1966 | *result = NULL; | |
1967 | input_type_value = bt_value_map_borrow_entry_value_const(params, "type"); | |
1968 | if (!input_type_value) { | |
1969 | BT_COMP_CLASS_LOGE_APPEND_CAUSE(self_comp_class, "Missing expected `type` parameter."); | |
1970 | goto error; | |
1971 | } | |
1972 | ||
1973 | if (!bt_value_is_string(input_type_value)) { | |
1974 | BT_COMP_CLASS_LOGE_APPEND_CAUSE(self_comp_class, "`type` parameter is not a string value."); | |
1975 | goto error; | |
1976 | } | |
1977 | ||
1978 | if (strcmp(bt_value_string_get(input_type_value), "string") != 0) { | |
1979 | /* We don't handle file system paths */ | |
1980 | goto create_result; | |
1981 | } | |
1982 | ||
1983 | input_value = bt_value_map_borrow_entry_value_const(params, "input"); | |
1984 | if (!input_value) { | |
1985 | BT_COMP_CLASS_LOGE_APPEND_CAUSE(self_comp_class, "Missing expected `input` parameter."); | |
1986 | goto error; | |
1987 | } | |
1988 | ||
1989 | if (!bt_value_is_string(input_value)) { | |
1990 | BT_COMP_CLASS_LOGE_APPEND_CAUSE(self_comp_class, | |
1991 | "`input` parameter is not a string value."); | |
1992 | goto error; | |
1993 | } | |
1994 | ||
1995 | parts = bt_common_parse_lttng_live_url(bt_value_string_get(input_value), NULL, 0); | |
1996 | if (parts.session_name) { | |
1997 | /* | |
1998 | * Looks pretty much like an LTTng live URL: we got the | |
1999 | * session name part, which forms a complete URL. | |
2000 | */ | |
2001 | weight = .75; | |
2002 | } | |
312df793 PP |
2003 | |
2004 | create_result: | |
4164020e SM |
2005 | *result = bt_value_real_create_init(weight); |
2006 | if (!*result) { | |
2007 | status = BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_MEMORY_ERROR; | |
2008 | goto error; | |
2009 | } | |
312df793 | 2010 | |
4164020e | 2011 | goto end; |
312df793 PP |
2012 | |
2013 | error: | |
4164020e SM |
2014 | if (status >= 0) { |
2015 | status = BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_ERROR; | |
2016 | } | |
312df793 | 2017 | |
4164020e | 2018 | BT_ASSERT(!*result); |
312df793 PP |
2019 | |
2020 | end: | |
4164020e SM |
2021 | bt_common_destroy_lttng_live_url_parts(&parts); |
2022 | return status; | |
312df793 PP |
2023 | } |
2024 | ||
4164020e SM |
2025 | bt_component_class_query_method_status lttng_live_query(bt_self_component_class_source *comp_class, |
2026 | bt_private_query_executor *priv_query_exec, | |
2027 | const char *object, const bt_value *params, | |
2028 | __attribute__((unused)) void *method_data, | |
2029 | const bt_value **result) | |
7cdc2bab | 2030 | { |
4164020e SM |
2031 | bt_component_class_query_method_status status = BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_OK; |
2032 | bt_self_component *self_comp = NULL; | |
2033 | bt_self_component_class *self_comp_class = | |
2034 | bt_self_component_class_source_as_self_component_class(comp_class); | |
2035 | bt_logging_level log_level = bt_query_executor_get_logging_level( | |
2036 | bt_private_query_executor_as_query_executor_const(priv_query_exec)); | |
2037 | ||
2038 | if (strcmp(object, "sessions") == 0) { | |
2039 | status = lttng_live_query_list_sessions(params, result, self_comp_class, log_level); | |
2040 | } else if (strcmp(object, "babeltrace.support-info") == 0) { | |
2041 | status = lttng_live_query_support_info(params, result, self_comp_class, log_level); | |
2042 | } else { | |
2043 | BT_COMP_LOGI("Unknown query object `%s`", object); | |
2044 | status = BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_UNKNOWN_OBJECT; | |
2045 | goto end; | |
2046 | } | |
14f28187 FD |
2047 | |
2048 | end: | |
4164020e | 2049 | return status; |
7cdc2bab MD |
2050 | } |
2051 | ||
4164020e | 2052 | static void lttng_live_component_destroy_data(struct lttng_live_component *lttng_live) |
7cdc2bab | 2053 | { |
4164020e SM |
2054 | if (!lttng_live) { |
2055 | return; | |
2056 | } | |
2057 | if (lttng_live->params.url) { | |
2058 | g_string_free(lttng_live->params.url, TRUE); | |
2059 | } | |
2060 | g_free(lttng_live); | |
7cdc2bab MD |
2061 | } |
2062 | ||
14f28187 | 2063 | void lttng_live_component_finalize(bt_self_component_source *component) |
7cdc2bab | 2064 | { |
4164020e SM |
2065 | lttng_live_component *data = (lttng_live_component *) bt_self_component_get_data( |
2066 | bt_self_component_source_as_self_component(component)); | |
2067 | ||
2068 | if (!data) { | |
2069 | return; | |
2070 | } | |
2071 | lttng_live_component_destroy_data(data); | |
7cdc2bab MD |
2072 | } |
2073 | ||
4164020e SM |
2074 | static enum session_not_found_action |
2075 | parse_session_not_found_action_param(const bt_value *no_session_param) | |
14f28187 | 2076 | { |
4164020e SM |
2077 | enum session_not_found_action action; |
2078 | const char *no_session_act_str = bt_value_string_get(no_session_param); | |
2079 | ||
2080 | if (strcmp(no_session_act_str, SESS_NOT_FOUND_ACTION_CONTINUE_STR) == 0) { | |
2081 | action = SESSION_NOT_FOUND_ACTION_CONTINUE; | |
2082 | } else if (strcmp(no_session_act_str, SESS_NOT_FOUND_ACTION_FAIL_STR) == 0) { | |
2083 | action = SESSION_NOT_FOUND_ACTION_FAIL; | |
2084 | } else { | |
2085 | BT_ASSERT(strcmp(no_session_act_str, SESS_NOT_FOUND_ACTION_END_STR) == 0); | |
2086 | action = SESSION_NOT_FOUND_ACTION_END; | |
2087 | } | |
2088 | ||
2089 | return action; | |
14f28187 FD |
2090 | } |
2091 | ||
88730e42 SM |
2092 | static bt_param_validation_value_descr inputs_elem_descr = |
2093 | bt_param_validation_value_descr::makeString(); | |
80aff5ef SM |
2094 | |
2095 | static const char *sess_not_found_action_choices[] = { | |
4164020e SM |
2096 | SESS_NOT_FOUND_ACTION_CONTINUE_STR, |
2097 | SESS_NOT_FOUND_ACTION_FAIL_STR, | |
2098 | SESS_NOT_FOUND_ACTION_END_STR, | |
80aff5ef SM |
2099 | }; |
2100 | ||
2101 | static struct bt_param_validation_map_value_entry_descr params_descr[] = { | |
88730e42 SM |
2102 | {INPUTS_PARAM, BT_PARAM_VALIDATION_MAP_VALUE_ENTRY_MANDATORY, |
2103 | bt_param_validation_value_descr::makeArray(1, 1, inputs_elem_descr)}, | |
2104 | {SESS_NOT_FOUND_ACTION_PARAM, BT_PARAM_VALIDATION_MAP_VALUE_ENTRY_OPTIONAL, | |
2105 | bt_param_validation_value_descr::makeString(sess_not_found_action_choices)}, | |
4164020e SM |
2106 | BT_PARAM_VALIDATION_MAP_VALUE_ENTRY_END}; |
2107 | ||
2108 | static bt_component_class_initialize_method_status | |
2109 | lttng_live_component_create(const bt_value *params, bt_logging_level log_level, | |
2110 | bt_self_component *self_comp, struct lttng_live_component **component) | |
7cdc2bab | 2111 | { |
4164020e SM |
2112 | struct lttng_live_component *lttng_live = NULL; |
2113 | const bt_value *inputs_value; | |
2114 | const bt_value *url_value; | |
2115 | const bt_value *value; | |
2116 | const char *url; | |
2117 | enum bt_param_validation_status validation_status; | |
2118 | gchar *validation_error = NULL; | |
2119 | bt_component_class_initialize_method_status status; | |
2120 | ||
2121 | validation_status = bt_param_validation_validate(params, params_descr, &validation_error); | |
2122 | if (validation_status == BT_PARAM_VALIDATION_STATUS_MEMORY_ERROR) { | |
2123 | status = BT_COMPONENT_CLASS_INITIALIZE_METHOD_STATUS_MEMORY_ERROR; | |
2124 | goto error; | |
2125 | } else if (validation_status == BT_PARAM_VALIDATION_STATUS_VALIDATION_ERROR) { | |
2126 | BT_COMP_LOGE_APPEND_CAUSE(self_comp, "%s", validation_error); | |
2127 | status = BT_COMPONENT_CLASS_INITIALIZE_METHOD_STATUS_ERROR; | |
2128 | goto error; | |
2129 | } | |
2130 | ||
2131 | lttng_live = g_new0(struct lttng_live_component, 1); | |
2132 | if (!lttng_live) { | |
2133 | status = BT_COMPONENT_CLASS_INITIALIZE_METHOD_STATUS_MEMORY_ERROR; | |
2134 | goto end; | |
2135 | } | |
2136 | lttng_live->log_level = log_level; | |
2137 | lttng_live->self_comp = self_comp; | |
2138 | lttng_live->max_query_size = MAX_QUERY_SIZE; | |
2139 | lttng_live->has_msg_iter = false; | |
2140 | ||
2141 | inputs_value = bt_value_map_borrow_entry_value_const(params, INPUTS_PARAM); | |
2142 | url_value = bt_value_array_borrow_element_by_index_const(inputs_value, 0); | |
2143 | url = bt_value_string_get(url_value); | |
2144 | ||
2145 | lttng_live->params.url = g_string_new(url); | |
2146 | if (!lttng_live->params.url) { | |
2147 | status = BT_COMPONENT_CLASS_INITIALIZE_METHOD_STATUS_MEMORY_ERROR; | |
2148 | goto error; | |
2149 | } | |
2150 | ||
2151 | value = bt_value_map_borrow_entry_value_const(params, SESS_NOT_FOUND_ACTION_PARAM); | |
2152 | if (value) { | |
2153 | lttng_live->params.sess_not_found_act = parse_session_not_found_action_param(value); | |
2154 | } else { | |
2155 | BT_COMP_LOGI("Optional `%s` parameter is missing: " | |
2156 | "defaulting to `%s`.", | |
2157 | SESS_NOT_FOUND_ACTION_PARAM, SESS_NOT_FOUND_ACTION_CONTINUE_STR); | |
2158 | lttng_live->params.sess_not_found_act = SESSION_NOT_FOUND_ACTION_CONTINUE; | |
2159 | } | |
2160 | ||
2161 | status = BT_COMPONENT_CLASS_INITIALIZE_METHOD_STATUS_OK; | |
2162 | goto end; | |
7cdc2bab MD |
2163 | |
2164 | error: | |
4164020e SM |
2165 | lttng_live_component_destroy_data(lttng_live); |
2166 | lttng_live = NULL; | |
7cdc2bab | 2167 | end: |
4164020e | 2168 | g_free(validation_error); |
80aff5ef | 2169 | |
4164020e SM |
2170 | *component = lttng_live; |
2171 | return status; | |
d3e4dcd8 PP |
2172 | } |
2173 | ||
4164020e SM |
2174 | bt_component_class_initialize_method_status |
2175 | lttng_live_component_init(bt_self_component_source *self_comp_src, | |
ecd7492f MJ |
2176 | bt_self_component_source_configuration *, const bt_value *params, |
2177 | void *) | |
f3bc2010 | 2178 | { |
4164020e SM |
2179 | struct lttng_live_component *lttng_live; |
2180 | bt_component_class_initialize_method_status ret; | |
2181 | bt_self_component *self_comp = bt_self_component_source_as_self_component(self_comp_src); | |
2182 | bt_logging_level log_level = | |
2183 | bt_component_get_logging_level(bt_self_component_as_component(self_comp)); | |
2184 | bt_self_component_add_port_status add_port_status; | |
2185 | ||
2186 | ret = lttng_live_component_create(params, log_level, self_comp, <tng_live); | |
2187 | if (ret != BT_COMPONENT_CLASS_INITIALIZE_METHOD_STATUS_OK) { | |
2188 | goto error; | |
2189 | } | |
2190 | ||
2191 | add_port_status = bt_self_component_source_add_output_port(self_comp_src, "out", NULL, NULL); | |
2192 | if (add_port_status != BT_SELF_COMPONENT_ADD_PORT_STATUS_OK) { | |
2193 | ret = (bt_component_class_initialize_method_status) add_port_status; | |
2194 | goto end; | |
2195 | } | |
2196 | ||
2197 | bt_self_component_set_data(self_comp, lttng_live); | |
2198 | goto end; | |
7cdc2bab | 2199 | |
19bdff20 | 2200 | error: |
4164020e SM |
2201 | lttng_live_component_destroy_data(lttng_live); |
2202 | lttng_live = NULL; | |
7cdc2bab | 2203 | end: |
4164020e | 2204 | return ret; |
d85ef162 | 2205 | } |