| 1 | /* |
| 2 | * SPDX-License-Identifier: MIT |
| 3 | * |
| 4 | * Copyright 2019 Francis Deslauriers <francis.deslauriers@efficios.com> |
| 5 | * Copyright 2016 Jérémie Galarneau <jeremie.galarneau@efficios.com> |
| 6 | * Copyright 2016 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
| 7 | * |
| 8 | * Babeltrace CTF LTTng-live Client Component |
| 9 | */ |
| 10 | |
| 11 | #define BT_COMP_LOG_SELF_COMP self_comp |
| 12 | #define BT_LOG_OUTPUT_LEVEL log_level |
| 13 | #define BT_LOG_TAG "PLUGIN/SRC.CTF.LTTNG-LIVE" |
| 14 | #include "logging/comp-logging.h" |
| 15 | |
| 16 | #include <inttypes.h> |
| 17 | #include <stdbool.h> |
| 18 | #include <unistd.h> |
| 19 | |
| 20 | #include <glib.h> |
| 21 | |
| 22 | #include "common/assert.h" |
| 23 | #include <babeltrace2/babeltrace.h> |
| 24 | #include "compat/compiler.h" |
| 25 | #include <babeltrace2/types.h> |
| 26 | |
| 27 | #include "plugins/common/muxing/muxing.h" |
| 28 | #include "plugins/common/param-validation/param-validation.h" |
| 29 | |
| 30 | #include "data-stream.hpp" |
| 31 | #include "metadata.hpp" |
| 32 | #include "lttng-live.hpp" |
| 33 | |
| 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" |
| 41 | |
| 42 | #define print_dbg(fmt, ...) BT_COMP_LOGD(fmt, ##__VA_ARGS__) |
| 43 | |
| 44 | static const char *lttng_live_iterator_status_string(enum lttng_live_iterator_status status) |
| 45 | { |
| 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 | } |
| 66 | } |
| 67 | |
| 68 | static const char *lttng_live_stream_state_string(enum lttng_live_stream_state state) |
| 69 | { |
| 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 | } |
| 84 | } |
| 85 | |
| 86 | void lttng_live_stream_iterator_set_state(struct lttng_live_stream_iterator *stream_iter, |
| 87 | enum lttng_live_stream_state new_state) |
| 88 | { |
| 89 | bt_self_component *self_comp = stream_iter->self_comp; |
| 90 | bt_logging_level log_level = stream_iter->log_level; |
| 91 | |
| 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)); |
| 96 | |
| 97 | stream_iter->state = new_state; |
| 98 | } |
| 99 | |
| 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); |
| 110 | |
| 111 | BT_HIDDEN |
| 112 | bool lttng_live_graph_is_canceled(struct lttng_live_msg_iter *msg_iter) |
| 113 | { |
| 114 | bool ret; |
| 115 | |
| 116 | if (!msg_iter) { |
| 117 | ret = false; |
| 118 | goto end; |
| 119 | } |
| 120 | |
| 121 | ret = bt_self_message_iterator_is_interrupted(msg_iter->self_msg_iter); |
| 122 | |
| 123 | end: |
| 124 | return ret; |
| 125 | } |
| 126 | |
| 127 | static struct lttng_live_trace * |
| 128 | lttng_live_session_borrow_trace_by_id(struct lttng_live_session *session, uint64_t trace_id) |
| 129 | { |
| 130 | uint64_t trace_idx; |
| 131 | struct lttng_live_trace *ret_trace = NULL; |
| 132 | |
| 133 | for (trace_idx = 0; trace_idx < session->traces->len; trace_idx++) { |
| 134 | struct lttng_live_trace *trace = |
| 135 | (lttng_live_trace *) g_ptr_array_index(session->traces, trace_idx); |
| 136 | if (trace->id == trace_id) { |
| 137 | ret_trace = trace; |
| 138 | goto end; |
| 139 | } |
| 140 | } |
| 141 | |
| 142 | end: |
| 143 | return ret_trace; |
| 144 | } |
| 145 | |
| 146 | static void lttng_live_destroy_trace(struct lttng_live_trace *trace) |
| 147 | { |
| 148 | bt_logging_level log_level = trace->log_level; |
| 149 | bt_self_component *self_comp = trace->self_comp; |
| 150 | |
| 151 | BT_COMP_LOGD("Destroying live trace: trace-id=%" PRIu64, trace->id); |
| 152 | |
| 153 | BT_ASSERT(trace->stream_iterators); |
| 154 | g_ptr_array_free(trace->stream_iterators, TRUE); |
| 155 | |
| 156 | BT_TRACE_PUT_REF_AND_RESET(trace->trace); |
| 157 | BT_TRACE_CLASS_PUT_REF_AND_RESET(trace->trace_class); |
| 158 | |
| 159 | lttng_live_metadata_fini(trace); |
| 160 | g_free(trace); |
| 161 | } |
| 162 | |
| 163 | static struct lttng_live_trace *lttng_live_create_trace(struct lttng_live_session *session, |
| 164 | uint64_t trace_id) |
| 165 | { |
| 166 | struct lttng_live_trace *trace = NULL; |
| 167 | bt_logging_level log_level = session->log_level; |
| 168 | bt_self_component *self_comp = session->self_comp; |
| 169 | |
| 170 | BT_COMP_LOGD("Creating live trace: " |
| 171 | "session-id=%" PRIu64 ", trace-id=%" PRIu64, |
| 172 | session->id, trace_id); |
| 173 | trace = g_new0(struct lttng_live_trace, 1); |
| 174 | if (!trace) { |
| 175 | BT_COMP_LOGE_APPEND_CAUSE(self_comp, "Failed to allocate live trace"); |
| 176 | goto error; |
| 177 | } |
| 178 | trace->log_level = session->log_level; |
| 179 | trace->self_comp = session->self_comp; |
| 180 | trace->session = session; |
| 181 | trace->id = trace_id; |
| 182 | trace->trace_class = NULL; |
| 183 | trace->trace = NULL; |
| 184 | trace->stream_iterators = |
| 185 | g_ptr_array_new_with_free_func((GDestroyNotify) lttng_live_stream_iterator_destroy); |
| 186 | BT_ASSERT(trace->stream_iterators); |
| 187 | trace->metadata_stream_state = LTTNG_LIVE_METADATA_STREAM_STATE_NEEDED; |
| 188 | g_ptr_array_add(session->traces, trace); |
| 189 | |
| 190 | goto end; |
| 191 | error: |
| 192 | g_free(trace); |
| 193 | trace = NULL; |
| 194 | end: |
| 195 | return trace; |
| 196 | } |
| 197 | |
| 198 | BT_HIDDEN |
| 199 | struct lttng_live_trace * |
| 200 | lttng_live_session_borrow_or_create_trace_by_id(struct lttng_live_session *session, |
| 201 | uint64_t trace_id) |
| 202 | { |
| 203 | struct lttng_live_trace *trace; |
| 204 | |
| 205 | trace = lttng_live_session_borrow_trace_by_id(session, trace_id); |
| 206 | if (trace) { |
| 207 | goto end; |
| 208 | } |
| 209 | |
| 210 | /* The session is the owner of the newly created trace. */ |
| 211 | trace = lttng_live_create_trace(session, trace_id); |
| 212 | |
| 213 | end: |
| 214 | return trace; |
| 215 | } |
| 216 | |
| 217 | BT_HIDDEN |
| 218 | int lttng_live_add_session(struct lttng_live_msg_iter *lttng_live_msg_iter, uint64_t session_id, |
| 219 | const char *hostname, const char *session_name) |
| 220 | { |
| 221 | int ret = 0; |
| 222 | struct lttng_live_session *session; |
| 223 | bt_logging_level log_level = lttng_live_msg_iter->log_level; |
| 224 | bt_self_component *self_comp = lttng_live_msg_iter->self_comp; |
| 225 | |
| 226 | BT_COMP_LOGD("Adding live session: " |
| 227 | "session-id=%" PRIu64 ", hostname=\"%s\" session-name=\"%s\"", |
| 228 | session_id, hostname, session_name); |
| 229 | |
| 230 | session = g_new0(struct lttng_live_session, 1); |
| 231 | if (!session) { |
| 232 | BT_COMP_LOGE_APPEND_CAUSE(self_comp, "Failed to allocate live session"); |
| 233 | goto error; |
| 234 | } |
| 235 | |
| 236 | session->log_level = lttng_live_msg_iter->log_level; |
| 237 | session->self_comp = lttng_live_msg_iter->self_comp; |
| 238 | session->id = session_id; |
| 239 | session->traces = g_ptr_array_new_with_free_func((GDestroyNotify) lttng_live_destroy_trace); |
| 240 | BT_ASSERT(session->traces); |
| 241 | session->lttng_live_msg_iter = lttng_live_msg_iter; |
| 242 | session->new_streams_needed = true; |
| 243 | session->hostname = g_string_new(hostname); |
| 244 | BT_ASSERT(session->hostname); |
| 245 | |
| 246 | session->session_name = g_string_new(session_name); |
| 247 | BT_ASSERT(session->session_name); |
| 248 | |
| 249 | g_ptr_array_add(lttng_live_msg_iter->sessions, session); |
| 250 | goto end; |
| 251 | error: |
| 252 | g_free(session); |
| 253 | ret = -1; |
| 254 | end: |
| 255 | return ret; |
| 256 | } |
| 257 | |
| 258 | static void lttng_live_destroy_session(struct lttng_live_session *session) |
| 259 | { |
| 260 | bt_logging_level log_level; |
| 261 | bt_self_component *self_comp; |
| 262 | |
| 263 | if (!session) { |
| 264 | goto end; |
| 265 | } |
| 266 | |
| 267 | log_level = session->log_level; |
| 268 | self_comp = session->self_comp; |
| 269 | BT_COMP_LOGD("Destroying live session: " |
| 270 | "session-id=%" PRIu64 ", session-name=\"%s\"", |
| 271 | session->id, session->session_name->str); |
| 272 | if (session->id != -1ULL) { |
| 273 | if (lttng_live_session_detach(session)) { |
| 274 | if (!lttng_live_graph_is_canceled(session->lttng_live_msg_iter)) { |
| 275 | /* Old relayd cannot detach sessions. */ |
| 276 | BT_COMP_LOGD("Unable to detach lttng live session %" PRIu64, session->id); |
| 277 | } |
| 278 | } |
| 279 | session->id = -1ULL; |
| 280 | } |
| 281 | |
| 282 | if (session->traces) { |
| 283 | g_ptr_array_free(session->traces, TRUE); |
| 284 | } |
| 285 | |
| 286 | if (session->hostname) { |
| 287 | g_string_free(session->hostname, TRUE); |
| 288 | } |
| 289 | if (session->session_name) { |
| 290 | g_string_free(session->session_name, TRUE); |
| 291 | } |
| 292 | g_free(session); |
| 293 | |
| 294 | end: |
| 295 | return; |
| 296 | } |
| 297 | |
| 298 | static void lttng_live_msg_iter_destroy(struct lttng_live_msg_iter *lttng_live_msg_iter) |
| 299 | { |
| 300 | if (!lttng_live_msg_iter) { |
| 301 | goto end; |
| 302 | } |
| 303 | |
| 304 | if (lttng_live_msg_iter->sessions) { |
| 305 | g_ptr_array_free(lttng_live_msg_iter->sessions, TRUE); |
| 306 | } |
| 307 | |
| 308 | if (lttng_live_msg_iter->viewer_connection) { |
| 309 | live_viewer_connection_destroy(lttng_live_msg_iter->viewer_connection); |
| 310 | } |
| 311 | BT_ASSERT(lttng_live_msg_iter->lttng_live_comp); |
| 312 | BT_ASSERT(lttng_live_msg_iter->lttng_live_comp->has_msg_iter); |
| 313 | |
| 314 | /* All stream iterators must be destroyed at this point. */ |
| 315 | BT_ASSERT(lttng_live_msg_iter->active_stream_iter == 0); |
| 316 | lttng_live_msg_iter->lttng_live_comp->has_msg_iter = false; |
| 317 | |
| 318 | g_free(lttng_live_msg_iter); |
| 319 | |
| 320 | end: |
| 321 | return; |
| 322 | } |
| 323 | |
| 324 | BT_HIDDEN |
| 325 | void lttng_live_msg_iter_finalize(bt_self_message_iterator *self_msg_iter) |
| 326 | { |
| 327 | struct lttng_live_msg_iter *lttng_live_msg_iter; |
| 328 | |
| 329 | BT_ASSERT(self_msg_iter); |
| 330 | |
| 331 | lttng_live_msg_iter = |
| 332 | (struct lttng_live_msg_iter *) bt_self_message_iterator_get_data(self_msg_iter); |
| 333 | BT_ASSERT(lttng_live_msg_iter); |
| 334 | lttng_live_msg_iter_destroy(lttng_live_msg_iter); |
| 335 | } |
| 336 | |
| 337 | static enum lttng_live_iterator_status |
| 338 | lttng_live_iterator_next_check_stream_state(struct lttng_live_stream_iterator *lttng_live_stream) |
| 339 | { |
| 340 | bt_logging_level log_level = lttng_live_stream->log_level; |
| 341 | bt_self_component *self_comp = lttng_live_stream->self_comp; |
| 342 | |
| 343 | switch (lttng_live_stream->state) { |
| 344 | case LTTNG_LIVE_STREAM_QUIESCENT: |
| 345 | case LTTNG_LIVE_STREAM_ACTIVE_DATA: |
| 346 | break; |
| 347 | case LTTNG_LIVE_STREAM_ACTIVE_NO_DATA: |
| 348 | /* Invalid state. */ |
| 349 | BT_COMP_LOGF("Unexpected stream state \"ACTIVE_NO_DATA\""); |
| 350 | bt_common_abort(); |
| 351 | case LTTNG_LIVE_STREAM_QUIESCENT_NO_DATA: |
| 352 | /* Invalid state. */ |
| 353 | BT_COMP_LOGF("Unexpected stream state \"QUIESCENT_NO_DATA\""); |
| 354 | bt_common_abort(); |
| 355 | case LTTNG_LIVE_STREAM_EOF: |
| 356 | break; |
| 357 | } |
| 358 | return LTTNG_LIVE_ITERATOR_STATUS_OK; |
| 359 | } |
| 360 | |
| 361 | /* |
| 362 | * For active no data stream, fetch next index. As a result of that it can |
| 363 | * become either: |
| 364 | * - quiescent: won't have events for a bit, |
| 365 | * - have data: need to get that data and produce the event, |
| 366 | * - have no data on this stream at this point: need to retry (AGAIN) or return |
| 367 | * EOF. |
| 368 | */ |
| 369 | static enum lttng_live_iterator_status lttng_live_iterator_next_handle_one_no_data_stream( |
| 370 | struct lttng_live_msg_iter *lttng_live_msg_iter, |
| 371 | struct lttng_live_stream_iterator *lttng_live_stream) |
| 372 | { |
| 373 | bt_logging_level log_level = lttng_live_msg_iter->log_level; |
| 374 | bt_self_component *self_comp = lttng_live_msg_iter->self_comp; |
| 375 | enum lttng_live_iterator_status ret = LTTNG_LIVE_ITERATOR_STATUS_OK; |
| 376 | enum lttng_live_stream_state orig_state = lttng_live_stream->state; |
| 377 | struct packet_index index; |
| 378 | |
| 379 | if (lttng_live_stream->trace->metadata_stream_state == |
| 380 | LTTNG_LIVE_METADATA_STREAM_STATE_NEEDED) { |
| 381 | BT_COMP_LOGD( |
| 382 | "Need to get an update for the metadata stream before proceeding further with this stream: " |
| 383 | "stream-name=\"%s\"", |
| 384 | lttng_live_stream->name->str); |
| 385 | ret = LTTNG_LIVE_ITERATOR_STATUS_CONTINUE; |
| 386 | goto end; |
| 387 | } |
| 388 | |
| 389 | if (lttng_live_stream->trace->session->new_streams_needed) { |
| 390 | BT_COMP_LOGD( |
| 391 | "Need to get an update of all streams before proceeding further with this stream: " |
| 392 | "stream-name=\"%s\"", |
| 393 | lttng_live_stream->name->str); |
| 394 | ret = LTTNG_LIVE_ITERATOR_STATUS_CONTINUE; |
| 395 | goto end; |
| 396 | } |
| 397 | |
| 398 | if (lttng_live_stream->state != LTTNG_LIVE_STREAM_ACTIVE_NO_DATA && |
| 399 | lttng_live_stream->state != LTTNG_LIVE_STREAM_QUIESCENT_NO_DATA) { |
| 400 | goto end; |
| 401 | } |
| 402 | ret = lttng_live_get_next_index(lttng_live_msg_iter, lttng_live_stream, &index); |
| 403 | if (ret != LTTNG_LIVE_ITERATOR_STATUS_OK) { |
| 404 | goto end; |
| 405 | } |
| 406 | |
| 407 | BT_ASSERT_DBG(lttng_live_stream->state != LTTNG_LIVE_STREAM_EOF); |
| 408 | |
| 409 | if (lttng_live_stream->state == LTTNG_LIVE_STREAM_QUIESCENT) { |
| 410 | uint64_t last_inact_ts = lttng_live_stream->last_inactivity_ts.value, |
| 411 | curr_inact_ts = lttng_live_stream->current_inactivity_ts; |
| 412 | |
| 413 | if (orig_state == LTTNG_LIVE_STREAM_QUIESCENT_NO_DATA && last_inact_ts == curr_inact_ts) { |
| 414 | /* |
| 415 | * Because the stream is in the QUIESCENT_NO_DATA |
| 416 | * state, we can assert that the last_inactivity_ts was |
| 417 | * set and can be safely used in the `if` above. |
| 418 | */ |
| 419 | BT_ASSERT(lttng_live_stream->last_inactivity_ts.is_set); |
| 420 | |
| 421 | ret = LTTNG_LIVE_ITERATOR_STATUS_AGAIN; |
| 422 | LTTNG_LIVE_LOGD_STREAM_ITER(lttng_live_stream); |
| 423 | } else { |
| 424 | ret = LTTNG_LIVE_ITERATOR_STATUS_CONTINUE; |
| 425 | } |
| 426 | goto end; |
| 427 | } |
| 428 | |
| 429 | lttng_live_stream->base_offset = index.offset; |
| 430 | lttng_live_stream->offset = index.offset; |
| 431 | lttng_live_stream->len = index.packet_size / CHAR_BIT; |
| 432 | |
| 433 | BT_COMP_LOGD("Setting live stream reading info: stream-name=\"%s\", " |
| 434 | "viewer-stream-id=%" PRIu64 ", stream-base-offset=%" PRIu64 |
| 435 | ", stream-offset=%" PRIu64 ", stream-len=%" PRIu64, |
| 436 | lttng_live_stream->name->str, lttng_live_stream->viewer_stream_id, |
| 437 | lttng_live_stream->base_offset, lttng_live_stream->offset, lttng_live_stream->len); |
| 438 | |
| 439 | end: |
| 440 | if (ret == LTTNG_LIVE_ITERATOR_STATUS_OK) { |
| 441 | ret = lttng_live_iterator_next_check_stream_state(lttng_live_stream); |
| 442 | } |
| 443 | return ret; |
| 444 | } |
| 445 | |
| 446 | /* |
| 447 | * Creation of the message requires the ctf trace class to be created |
| 448 | * beforehand, but the live protocol gives us all streams (including metadata) |
| 449 | * at once. So we split it in three steps: getting streams, getting metadata |
| 450 | * (which creates the ctf trace class), and then creating the per-stream |
| 451 | * messages. |
| 452 | */ |
| 453 | static enum lttng_live_iterator_status |
| 454 | lttng_live_get_session(struct lttng_live_msg_iter *lttng_live_msg_iter, |
| 455 | struct lttng_live_session *session) |
| 456 | { |
| 457 | bt_logging_level log_level = lttng_live_msg_iter->log_level; |
| 458 | bt_self_component *self_comp = lttng_live_msg_iter->self_comp; |
| 459 | enum lttng_live_iterator_status status; |
| 460 | uint64_t trace_idx; |
| 461 | |
| 462 | if (!session->attached) { |
| 463 | BT_COMP_LOGD("Attach to session: session-id=%" PRIu64, session->id); |
| 464 | enum lttng_live_viewer_status attach_status = |
| 465 | lttng_live_session_attach(session, lttng_live_msg_iter->self_msg_iter); |
| 466 | if (attach_status != LTTNG_LIVE_VIEWER_STATUS_OK) { |
| 467 | if (lttng_live_graph_is_canceled(lttng_live_msg_iter)) { |
| 468 | /* |
| 469 | * Clear any causes appended in |
| 470 | * `lttng_live_attach_session()` as we want to |
| 471 | * return gracefully since the graph was |
| 472 | * cancelled. |
| 473 | */ |
| 474 | bt_current_thread_clear_error(); |
| 475 | status = LTTNG_LIVE_ITERATOR_STATUS_AGAIN; |
| 476 | } else { |
| 477 | status = LTTNG_LIVE_ITERATOR_STATUS_ERROR; |
| 478 | BT_COMP_LOGE_APPEND_CAUSE(self_comp, "Error attaching to LTTng live session"); |
| 479 | } |
| 480 | goto end; |
| 481 | } |
| 482 | } |
| 483 | |
| 484 | BT_COMP_LOGD("Updating all data streams: " |
| 485 | "session-id=%" PRIu64 ", session-name=\"%s\"", |
| 486 | session->id, session->session_name->str); |
| 487 | |
| 488 | status = lttng_live_session_get_new_streams(session, lttng_live_msg_iter->self_msg_iter); |
| 489 | switch (status) { |
| 490 | case LTTNG_LIVE_ITERATOR_STATUS_OK: |
| 491 | break; |
| 492 | case LTTNG_LIVE_ITERATOR_STATUS_END: |
| 493 | /* |
| 494 | * We received a `_END` from the `_get_new_streams()` function, |
| 495 | * which means no more data will ever be received from the data |
| 496 | * streams of this session. But it's possible that the metadata |
| 497 | * is incomplete. |
| 498 | * The live protocol guarantees that we receive all the |
| 499 | * metadata needed before we receive data streams needing it. |
| 500 | * But it's possible to receive metadata NOT needed by |
| 501 | * data streams after the session was closed. For example, this |
| 502 | * could happen if a new event is registered and the session is |
| 503 | * stopped before any tracepoint for that event is actually |
| 504 | * fired. |
| 505 | */ |
| 506 | BT_COMP_LOGD( |
| 507 | "Updating streams returned _END status. Override status to _OK in order fetch any remaining metadata:" |
| 508 | "session-id=%" PRIu64 ", session-name=\"%s\"", |
| 509 | session->id, session->session_name->str); |
| 510 | status = LTTNG_LIVE_ITERATOR_STATUS_OK; |
| 511 | break; |
| 512 | default: |
| 513 | goto end; |
| 514 | } |
| 515 | |
| 516 | BT_COMP_LOGD("Updating metadata stream for session: " |
| 517 | "session-id=%" PRIu64 ", session-name=\"%s\"", |
| 518 | session->id, session->session_name->str); |
| 519 | |
| 520 | trace_idx = 0; |
| 521 | while (trace_idx < session->traces->len) { |
| 522 | struct lttng_live_trace *trace = |
| 523 | (lttng_live_trace *) g_ptr_array_index(session->traces, trace_idx); |
| 524 | |
| 525 | status = lttng_live_metadata_update(trace); |
| 526 | switch (status) { |
| 527 | case LTTNG_LIVE_ITERATOR_STATUS_END: |
| 528 | case LTTNG_LIVE_ITERATOR_STATUS_OK: |
| 529 | trace_idx++; |
| 530 | break; |
| 531 | case LTTNG_LIVE_ITERATOR_STATUS_CONTINUE: |
| 532 | case LTTNG_LIVE_ITERATOR_STATUS_AGAIN: |
| 533 | goto end; |
| 534 | default: |
| 535 | BT_COMP_LOGE_APPEND_CAUSE(self_comp, |
| 536 | "Error updating trace metadata: " |
| 537 | "stream-iter-status=%s, trace-id=%" PRIu64, |
| 538 | lttng_live_iterator_status_string(status), trace->id); |
| 539 | goto end; |
| 540 | } |
| 541 | } |
| 542 | |
| 543 | /* |
| 544 | * Now that we have the metadata we can initialize the downstream |
| 545 | * iterator. |
| 546 | */ |
| 547 | status = lttng_live_lazy_msg_init(session, lttng_live_msg_iter->self_msg_iter); |
| 548 | |
| 549 | end: |
| 550 | return status; |
| 551 | } |
| 552 | |
| 553 | static void |
| 554 | lttng_live_force_new_streams_and_metadata(struct lttng_live_msg_iter *lttng_live_msg_iter) |
| 555 | { |
| 556 | uint64_t session_idx, trace_idx; |
| 557 | bt_logging_level log_level = lttng_live_msg_iter->log_level; |
| 558 | bt_self_component *self_comp = lttng_live_msg_iter->self_comp; |
| 559 | |
| 560 | for (session_idx = 0; session_idx < lttng_live_msg_iter->sessions->len; session_idx++) { |
| 561 | struct lttng_live_session *session = |
| 562 | (lttng_live_session *) g_ptr_array_index(lttng_live_msg_iter->sessions, session_idx); |
| 563 | BT_COMP_LOGD("Force marking session as needing new streams: " |
| 564 | "session-id=%" PRIu64, |
| 565 | session->id); |
| 566 | session->new_streams_needed = true; |
| 567 | for (trace_idx = 0; trace_idx < session->traces->len; trace_idx++) { |
| 568 | struct lttng_live_trace *trace = |
| 569 | (lttng_live_trace *) g_ptr_array_index(session->traces, trace_idx); |
| 570 | BT_COMP_LOGD("Force marking trace metadata state as needing an update: " |
| 571 | "session-id=%" PRIu64 ", trace-id=%" PRIu64, |
| 572 | session->id, trace->id); |
| 573 | |
| 574 | BT_ASSERT(trace->metadata_stream_state != LTTNG_LIVE_METADATA_STREAM_STATE_CLOSED); |
| 575 | |
| 576 | trace->metadata_stream_state = LTTNG_LIVE_METADATA_STREAM_STATE_NEEDED; |
| 577 | } |
| 578 | } |
| 579 | } |
| 580 | |
| 581 | static enum lttng_live_iterator_status |
| 582 | lttng_live_iterator_handle_new_streams_and_metadata(struct lttng_live_msg_iter *lttng_live_msg_iter) |
| 583 | { |
| 584 | enum lttng_live_iterator_status status; |
| 585 | enum lttng_live_viewer_status viewer_status; |
| 586 | bt_logging_level log_level = lttng_live_msg_iter->log_level; |
| 587 | bt_self_component *self_comp = lttng_live_msg_iter->self_comp; |
| 588 | uint64_t session_idx = 0, nr_sessions_opened = 0; |
| 589 | struct lttng_live_session *session; |
| 590 | enum session_not_found_action sess_not_found_act = |
| 591 | lttng_live_msg_iter->lttng_live_comp->params.sess_not_found_act; |
| 592 | |
| 593 | BT_COMP_LOGD("Update data and metadata of all sessions: " |
| 594 | "live-msg-iter-addr=%p", |
| 595 | lttng_live_msg_iter); |
| 596 | /* |
| 597 | * In a remotely distant future, we could add a "new |
| 598 | * session" flag to the protocol, which would tell us that we |
| 599 | * need to query for new sessions even though we have sessions |
| 600 | * currently ongoing. |
| 601 | */ |
| 602 | if (lttng_live_msg_iter->sessions->len == 0) { |
| 603 | if (sess_not_found_act != SESSION_NOT_FOUND_ACTION_CONTINUE) { |
| 604 | BT_COMP_LOGD( |
| 605 | "No session found. Exiting in accordance with the `session-not-found-action` parameter"); |
| 606 | status = LTTNG_LIVE_ITERATOR_STATUS_END; |
| 607 | goto end; |
| 608 | } else { |
| 609 | BT_COMP_LOGD( |
| 610 | "No session found. Try creating a new one in accordance with the `session-not-found-action` parameter"); |
| 611 | /* |
| 612 | * Retry to create a viewer session for the requested |
| 613 | * session name. |
| 614 | */ |
| 615 | viewer_status = lttng_live_create_viewer_session(lttng_live_msg_iter); |
| 616 | if (viewer_status != LTTNG_LIVE_VIEWER_STATUS_OK) { |
| 617 | if (viewer_status == LTTNG_LIVE_VIEWER_STATUS_ERROR) { |
| 618 | status = LTTNG_LIVE_ITERATOR_STATUS_ERROR; |
| 619 | BT_COMP_LOGE_APPEND_CAUSE(self_comp, |
| 620 | "Error creating LTTng live viewer session"); |
| 621 | } else if (viewer_status == LTTNG_LIVE_VIEWER_STATUS_INTERRUPTED) { |
| 622 | status = LTTNG_LIVE_ITERATOR_STATUS_AGAIN; |
| 623 | } else { |
| 624 | bt_common_abort(); |
| 625 | } |
| 626 | goto end; |
| 627 | } |
| 628 | } |
| 629 | } |
| 630 | |
| 631 | for (session_idx = 0; session_idx < lttng_live_msg_iter->sessions->len; session_idx++) { |
| 632 | session = |
| 633 | (lttng_live_session *) g_ptr_array_index(lttng_live_msg_iter->sessions, session_idx); |
| 634 | status = lttng_live_get_session(lttng_live_msg_iter, session); |
| 635 | switch (status) { |
| 636 | case LTTNG_LIVE_ITERATOR_STATUS_OK: |
| 637 | case LTTNG_LIVE_ITERATOR_STATUS_END: |
| 638 | /* |
| 639 | * A session returned `_END`. Other sessions may still |
| 640 | * be active so we override the status and continue |
| 641 | * looping if needed. |
| 642 | */ |
| 643 | break; |
| 644 | default: |
| 645 | goto end; |
| 646 | } |
| 647 | if (!session->closed) { |
| 648 | nr_sessions_opened++; |
| 649 | } |
| 650 | } |
| 651 | |
| 652 | if (sess_not_found_act != SESSION_NOT_FOUND_ACTION_CONTINUE && nr_sessions_opened == 0) { |
| 653 | status = LTTNG_LIVE_ITERATOR_STATUS_END; |
| 654 | } else { |
| 655 | status = LTTNG_LIVE_ITERATOR_STATUS_OK; |
| 656 | } |
| 657 | |
| 658 | end: |
| 659 | return status; |
| 660 | } |
| 661 | |
| 662 | static enum lttng_live_iterator_status |
| 663 | emit_inactivity_message(struct lttng_live_msg_iter *lttng_live_msg_iter, |
| 664 | struct lttng_live_stream_iterator *stream_iter, const bt_message **message, |
| 665 | uint64_t timestamp) |
| 666 | { |
| 667 | enum lttng_live_iterator_status ret = LTTNG_LIVE_ITERATOR_STATUS_OK; |
| 668 | bt_logging_level log_level = lttng_live_msg_iter->log_level; |
| 669 | bt_self_component *self_comp = lttng_live_msg_iter->self_comp; |
| 670 | bt_message *msg = NULL; |
| 671 | |
| 672 | BT_ASSERT(stream_iter->trace->clock_class); |
| 673 | |
| 674 | BT_COMP_LOGD("Emitting inactivity message for stream: ctf-stream-id=%" PRIu64 |
| 675 | ", viewer-stream-id=%" PRIu64 ", timestamp=%" PRIu64, |
| 676 | stream_iter->ctf_stream_class_id.value, stream_iter->viewer_stream_id, timestamp); |
| 677 | |
| 678 | msg = bt_message_message_iterator_inactivity_create(lttng_live_msg_iter->self_msg_iter, |
| 679 | stream_iter->trace->clock_class, timestamp); |
| 680 | if (!msg) { |
| 681 | BT_COMP_LOGE_APPEND_CAUSE(self_comp, "Error emitting message iterator inactivity message"); |
| 682 | goto error; |
| 683 | } |
| 684 | |
| 685 | *message = msg; |
| 686 | end: |
| 687 | return ret; |
| 688 | |
| 689 | error: |
| 690 | ret = LTTNG_LIVE_ITERATOR_STATUS_ERROR; |
| 691 | bt_message_put_ref(msg); |
| 692 | goto end; |
| 693 | } |
| 694 | |
| 695 | static enum lttng_live_iterator_status lttng_live_iterator_next_handle_one_quiescent_stream( |
| 696 | struct lttng_live_msg_iter *lttng_live_msg_iter, |
| 697 | struct lttng_live_stream_iterator *lttng_live_stream, const bt_message **message) |
| 698 | { |
| 699 | enum lttng_live_iterator_status ret = LTTNG_LIVE_ITERATOR_STATUS_OK; |
| 700 | |
| 701 | if (lttng_live_stream->state != LTTNG_LIVE_STREAM_QUIESCENT) { |
| 702 | return LTTNG_LIVE_ITERATOR_STATUS_OK; |
| 703 | } |
| 704 | |
| 705 | /* |
| 706 | * Check if we already sent an inactivty message downstream for this |
| 707 | * `current_inactivity_ts` value. |
| 708 | */ |
| 709 | if (lttng_live_stream->last_inactivity_ts.is_set && |
| 710 | lttng_live_stream->current_inactivity_ts == lttng_live_stream->last_inactivity_ts.value) { |
| 711 | lttng_live_stream_iterator_set_state(lttng_live_stream, |
| 712 | LTTNG_LIVE_STREAM_QUIESCENT_NO_DATA); |
| 713 | |
| 714 | ret = LTTNG_LIVE_ITERATOR_STATUS_CONTINUE; |
| 715 | goto end; |
| 716 | } |
| 717 | |
| 718 | ret = emit_inactivity_message(lttng_live_msg_iter, lttng_live_stream, message, |
| 719 | lttng_live_stream->current_inactivity_ts); |
| 720 | |
| 721 | lttng_live_stream->last_inactivity_ts.value = lttng_live_stream->current_inactivity_ts; |
| 722 | lttng_live_stream->last_inactivity_ts.is_set = true; |
| 723 | end: |
| 724 | return ret; |
| 725 | } |
| 726 | |
| 727 | static int live_get_msg_ts_ns(struct lttng_live_stream_iterator *stream_iter, |
| 728 | struct lttng_live_msg_iter *lttng_live_msg_iter, |
| 729 | const bt_message *msg, int64_t last_msg_ts_ns, int64_t *ts_ns) |
| 730 | { |
| 731 | const bt_clock_class *clock_class = NULL; |
| 732 | const bt_clock_snapshot *clock_snapshot = NULL; |
| 733 | int ret = 0; |
| 734 | bt_logging_level log_level = lttng_live_msg_iter->log_level; |
| 735 | bt_self_component *self_comp = lttng_live_msg_iter->self_comp; |
| 736 | |
| 737 | BT_ASSERT_DBG(msg); |
| 738 | BT_ASSERT_DBG(ts_ns); |
| 739 | |
| 740 | BT_COMP_LOGD("Getting message's timestamp: iter-data-addr=%p, msg-addr=%p, " |
| 741 | "last-msg-ts=%" PRId64, |
| 742 | lttng_live_msg_iter, msg, last_msg_ts_ns); |
| 743 | |
| 744 | switch (bt_message_get_type(msg)) { |
| 745 | case BT_MESSAGE_TYPE_EVENT: |
| 746 | clock_class = bt_message_event_borrow_stream_class_default_clock_class_const(msg); |
| 747 | BT_ASSERT_DBG(clock_class); |
| 748 | |
| 749 | clock_snapshot = bt_message_event_borrow_default_clock_snapshot_const(msg); |
| 750 | break; |
| 751 | case BT_MESSAGE_TYPE_PACKET_BEGINNING: |
| 752 | clock_class = |
| 753 | bt_message_packet_beginning_borrow_stream_class_default_clock_class_const(msg); |
| 754 | BT_ASSERT(clock_class); |
| 755 | |
| 756 | clock_snapshot = bt_message_packet_beginning_borrow_default_clock_snapshot_const(msg); |
| 757 | break; |
| 758 | case BT_MESSAGE_TYPE_PACKET_END: |
| 759 | clock_class = bt_message_packet_end_borrow_stream_class_default_clock_class_const(msg); |
| 760 | BT_ASSERT(clock_class); |
| 761 | |
| 762 | clock_snapshot = bt_message_packet_end_borrow_default_clock_snapshot_const(msg); |
| 763 | break; |
| 764 | case BT_MESSAGE_TYPE_DISCARDED_EVENTS: |
| 765 | clock_class = |
| 766 | bt_message_discarded_events_borrow_stream_class_default_clock_class_const(msg); |
| 767 | BT_ASSERT(clock_class); |
| 768 | |
| 769 | clock_snapshot = |
| 770 | bt_message_discarded_events_borrow_beginning_default_clock_snapshot_const(msg); |
| 771 | break; |
| 772 | case BT_MESSAGE_TYPE_DISCARDED_PACKETS: |
| 773 | clock_class = |
| 774 | bt_message_discarded_packets_borrow_stream_class_default_clock_class_const(msg); |
| 775 | BT_ASSERT(clock_class); |
| 776 | |
| 777 | clock_snapshot = |
| 778 | bt_message_discarded_packets_borrow_beginning_default_clock_snapshot_const(msg); |
| 779 | break; |
| 780 | case BT_MESSAGE_TYPE_MESSAGE_ITERATOR_INACTIVITY: |
| 781 | clock_snapshot = bt_message_message_iterator_inactivity_borrow_clock_snapshot_const(msg); |
| 782 | break; |
| 783 | default: |
| 784 | /* All the other messages have a higher priority */ |
| 785 | BT_COMP_LOGD_STR("Message has no timestamp: using the last message timestamp."); |
| 786 | *ts_ns = last_msg_ts_ns; |
| 787 | goto end; |
| 788 | } |
| 789 | |
| 790 | clock_class = bt_clock_snapshot_borrow_clock_class_const(clock_snapshot); |
| 791 | BT_ASSERT_DBG(clock_class); |
| 792 | |
| 793 | ret = bt_clock_snapshot_get_ns_from_origin(clock_snapshot, ts_ns); |
| 794 | if (ret) { |
| 795 | BT_COMP_LOGE_APPEND_CAUSE(self_comp, |
| 796 | "Cannot get nanoseconds from Epoch of clock snapshot: " |
| 797 | "clock-snapshot-addr=%p", |
| 798 | clock_snapshot); |
| 799 | goto error; |
| 800 | } |
| 801 | |
| 802 | goto end; |
| 803 | |
| 804 | error: |
| 805 | ret = -1; |
| 806 | |
| 807 | end: |
| 808 | if (ret == 0) { |
| 809 | BT_COMP_LOGD("Found message's timestamp: " |
| 810 | "iter-data-addr=%p, msg-addr=%p, " |
| 811 | "last-msg-ts=%" PRId64 ", ts=%" PRId64, |
| 812 | lttng_live_msg_iter, msg, last_msg_ts_ns, *ts_ns); |
| 813 | } |
| 814 | |
| 815 | return ret; |
| 816 | } |
| 817 | |
| 818 | static enum lttng_live_iterator_status lttng_live_iterator_next_handle_one_active_data_stream( |
| 819 | struct lttng_live_msg_iter *lttng_live_msg_iter, |
| 820 | struct lttng_live_stream_iterator *lttng_live_stream, const bt_message **message) |
| 821 | { |
| 822 | enum lttng_live_iterator_status ret = LTTNG_LIVE_ITERATOR_STATUS_OK; |
| 823 | bt_logging_level log_level = lttng_live_msg_iter->log_level; |
| 824 | bt_self_component *self_comp = lttng_live_msg_iter->self_comp; |
| 825 | enum ctf_msg_iter_status status; |
| 826 | uint64_t session_idx, trace_idx; |
| 827 | |
| 828 | for (session_idx = 0; session_idx < lttng_live_msg_iter->sessions->len; session_idx++) { |
| 829 | struct lttng_live_session *session = |
| 830 | (lttng_live_session *) g_ptr_array_index(lttng_live_msg_iter->sessions, session_idx); |
| 831 | |
| 832 | if (session->new_streams_needed) { |
| 833 | BT_COMP_LOGD("Need an update for streams: " |
| 834 | "session-id=%" PRIu64, |
| 835 | session->id); |
| 836 | ret = LTTNG_LIVE_ITERATOR_STATUS_CONTINUE; |
| 837 | goto end; |
| 838 | } |
| 839 | for (trace_idx = 0; trace_idx < session->traces->len; trace_idx++) { |
| 840 | struct lttng_live_trace *trace = |
| 841 | (lttng_live_trace *) g_ptr_array_index(session->traces, trace_idx); |
| 842 | if (trace->metadata_stream_state == LTTNG_LIVE_METADATA_STREAM_STATE_NEEDED) { |
| 843 | BT_COMP_LOGD("Need an update for metadata stream: " |
| 844 | "session-id=%" PRIu64 ", trace-id=%" PRIu64, |
| 845 | session->id, trace->id); |
| 846 | ret = LTTNG_LIVE_ITERATOR_STATUS_CONTINUE; |
| 847 | goto end; |
| 848 | } |
| 849 | } |
| 850 | } |
| 851 | |
| 852 | if (lttng_live_stream->state != LTTNG_LIVE_STREAM_ACTIVE_DATA) { |
| 853 | ret = LTTNG_LIVE_ITERATOR_STATUS_ERROR; |
| 854 | BT_COMP_LOGE_APPEND_CAUSE(self_comp, |
| 855 | "Invalid state of live stream iterator" |
| 856 | "stream-iter-status=%s", |
| 857 | lttng_live_stream_state_string(lttng_live_stream->state)); |
| 858 | goto end; |
| 859 | } |
| 860 | |
| 861 | status = ctf_msg_iter_get_next_message(lttng_live_stream->msg_iter, message); |
| 862 | switch (status) { |
| 863 | case CTF_MSG_ITER_STATUS_EOF: |
| 864 | ret = LTTNG_LIVE_ITERATOR_STATUS_END; |
| 865 | break; |
| 866 | case CTF_MSG_ITER_STATUS_OK: |
| 867 | ret = LTTNG_LIVE_ITERATOR_STATUS_OK; |
| 868 | break; |
| 869 | case CTF_MSG_ITER_STATUS_AGAIN: |
| 870 | /* |
| 871 | * Continue immediately (end of packet). The next |
| 872 | * get_index may return AGAIN to delay the following |
| 873 | * attempt. |
| 874 | */ |
| 875 | ret = LTTNG_LIVE_ITERATOR_STATUS_CONTINUE; |
| 876 | break; |
| 877 | case CTF_MSG_ITER_STATUS_ERROR: |
| 878 | default: |
| 879 | ret = LTTNG_LIVE_ITERATOR_STATUS_ERROR; |
| 880 | BT_COMP_LOGE_APPEND_CAUSE(self_comp, |
| 881 | "CTF message iterator failed to get next message: " |
| 882 | "msg-iter=%p, msg-iter-status=%s", |
| 883 | lttng_live_stream->msg_iter, ctf_msg_iter_status_string(status)); |
| 884 | break; |
| 885 | } |
| 886 | |
| 887 | end: |
| 888 | return ret; |
| 889 | } |
| 890 | |
| 891 | static enum lttng_live_iterator_status |
| 892 | lttng_live_iterator_close_stream(struct lttng_live_msg_iter *lttng_live_msg_iter, |
| 893 | struct lttng_live_stream_iterator *stream_iter, |
| 894 | const bt_message **curr_msg) |
| 895 | { |
| 896 | enum lttng_live_iterator_status live_status = LTTNG_LIVE_ITERATOR_STATUS_OK; |
| 897 | bt_logging_level log_level = lttng_live_msg_iter->log_level; |
| 898 | bt_self_component *self_comp = lttng_live_msg_iter->self_comp; |
| 899 | |
| 900 | BT_COMP_LOGD("Closing live stream iterator: stream-name=\"%s\", " |
| 901 | "viewer-stream-id=%" PRIu64, |
| 902 | stream_iter->name->str, stream_iter->viewer_stream_id); |
| 903 | |
| 904 | /* |
| 905 | * The viewer has hung up on us so we are closing the stream. The |
| 906 | * `ctf_msg_iter` should simply realize that it needs to close the |
| 907 | * stream properly by emitting the necessary stream end message. |
| 908 | */ |
| 909 | enum ctf_msg_iter_status status = |
| 910 | ctf_msg_iter_get_next_message(stream_iter->msg_iter, curr_msg); |
| 911 | |
| 912 | if (status == CTF_MSG_ITER_STATUS_ERROR) { |
| 913 | BT_COMP_LOGE_APPEND_CAUSE(self_comp, |
| 914 | "Error getting the next message from CTF message iterator"); |
| 915 | live_status = LTTNG_LIVE_ITERATOR_STATUS_ERROR; |
| 916 | goto end; |
| 917 | } else if (status == CTF_MSG_ITER_STATUS_EOF) { |
| 918 | BT_COMP_LOGI("Reached the end of the live stream iterator."); |
| 919 | live_status = LTTNG_LIVE_ITERATOR_STATUS_END; |
| 920 | goto end; |
| 921 | } |
| 922 | |
| 923 | BT_ASSERT(status == CTF_MSG_ITER_STATUS_OK); |
| 924 | |
| 925 | end: |
| 926 | return live_status; |
| 927 | } |
| 928 | |
| 929 | /* |
| 930 | * helper function: |
| 931 | * handle_no_data_streams() |
| 932 | * retry: |
| 933 | * - for each ACTIVE_NO_DATA stream: |
| 934 | * - query relayd for stream data, or quiescence info. |
| 935 | * - if need metadata, get metadata, goto retry. |
| 936 | * - if new stream, get new stream as ACTIVE_NO_DATA, goto retry |
| 937 | * - if quiescent, move to QUIESCENT streams |
| 938 | * - if fetched data, move to ACTIVE_DATA streams |
| 939 | * (at this point each stream either has data, or is quiescent) |
| 940 | * |
| 941 | * |
| 942 | * iterator_next: |
| 943 | * handle_new_streams_and_metadata() |
| 944 | * - query relayd for known streams, add them as ACTIVE_NO_DATA |
| 945 | * - query relayd for metadata |
| 946 | * |
| 947 | * call handle_active_no_data_streams() |
| 948 | * |
| 949 | * handle_quiescent_streams() |
| 950 | * - if at least one stream is ACTIVE_DATA: |
| 951 | * - peek stream event with lowest timestamp -> next_ts |
| 952 | * - for each quiescent stream |
| 953 | * - if next_ts >= quiescent end |
| 954 | * - set state to ACTIVE_NO_DATA |
| 955 | * - else |
| 956 | * - for each quiescent stream |
| 957 | * - set state to ACTIVE_NO_DATA |
| 958 | * |
| 959 | * call handle_active_no_data_streams() |
| 960 | * |
| 961 | * handle_active_data_streams() |
| 962 | * - if at least one stream is ACTIVE_DATA: |
| 963 | * - get stream event with lowest timestamp from heap |
| 964 | * - make that stream event the current message. |
| 965 | * - move this stream heap position to its next event |
| 966 | * - if we need to fetch data from relayd, move |
| 967 | * stream to ACTIVE_NO_DATA. |
| 968 | * - return OK |
| 969 | * - return AGAIN |
| 970 | * |
| 971 | * end criterion: ctrl-c on client. If relayd exits or the session |
| 972 | * closes on the relay daemon side, we keep on waiting for streams. |
| 973 | * Eventually handle --end timestamp (also an end criterion). |
| 974 | * |
| 975 | * When disconnected from relayd: try to re-connect endlessly. |
| 976 | */ |
| 977 | static enum lttng_live_iterator_status |
| 978 | lttng_live_iterator_next_msg_on_stream(struct lttng_live_msg_iter *lttng_live_msg_iter, |
| 979 | struct lttng_live_stream_iterator *stream_iter, |
| 980 | const bt_message **curr_msg) |
| 981 | { |
| 982 | bt_logging_level log_level = lttng_live_msg_iter->log_level; |
| 983 | bt_self_component *self_comp = lttng_live_msg_iter->self_comp; |
| 984 | enum lttng_live_iterator_status live_status; |
| 985 | |
| 986 | BT_COMP_LOGD("Advancing live stream iterator until next message if possible: " |
| 987 | "stream-name=\"%s\", viewer-stream-id=%" PRIu64, |
| 988 | stream_iter->name->str, stream_iter->viewer_stream_id); |
| 989 | |
| 990 | if (stream_iter->has_stream_hung_up) { |
| 991 | /* |
| 992 | * The stream has hung up and the stream was properly closed |
| 993 | * during the last call to the current function. Return _END |
| 994 | * status now so that this stream iterator is removed for the |
| 995 | * stream iterator list. |
| 996 | */ |
| 997 | live_status = LTTNG_LIVE_ITERATOR_STATUS_END; |
| 998 | goto end; |
| 999 | } |
| 1000 | |
| 1001 | retry: |
| 1002 | LTTNG_LIVE_LOGD_STREAM_ITER(stream_iter); |
| 1003 | |
| 1004 | /* |
| 1005 | * Make sure we have the most recent metadata and possibly some new |
| 1006 | * streams. |
| 1007 | */ |
| 1008 | live_status = lttng_live_iterator_handle_new_streams_and_metadata(lttng_live_msg_iter); |
| 1009 | if (live_status != LTTNG_LIVE_ITERATOR_STATUS_OK) { |
| 1010 | goto end; |
| 1011 | } |
| 1012 | |
| 1013 | live_status = |
| 1014 | lttng_live_iterator_next_handle_one_no_data_stream(lttng_live_msg_iter, stream_iter); |
| 1015 | if (live_status != LTTNG_LIVE_ITERATOR_STATUS_OK) { |
| 1016 | if (live_status == LTTNG_LIVE_ITERATOR_STATUS_END) { |
| 1017 | /* |
| 1018 | * We overwrite `live_status` since `curr_msg` is |
| 1019 | * likely set to a valid message in this function. |
| 1020 | */ |
| 1021 | live_status = |
| 1022 | lttng_live_iterator_close_stream(lttng_live_msg_iter, stream_iter, curr_msg); |
| 1023 | } |
| 1024 | goto end; |
| 1025 | } |
| 1026 | |
| 1027 | live_status = lttng_live_iterator_next_handle_one_quiescent_stream(lttng_live_msg_iter, |
| 1028 | stream_iter, curr_msg); |
| 1029 | if (live_status != LTTNG_LIVE_ITERATOR_STATUS_OK) { |
| 1030 | BT_ASSERT(!*curr_msg); |
| 1031 | goto end; |
| 1032 | } |
| 1033 | if (*curr_msg) { |
| 1034 | goto end; |
| 1035 | } |
| 1036 | live_status = lttng_live_iterator_next_handle_one_active_data_stream(lttng_live_msg_iter, |
| 1037 | stream_iter, curr_msg); |
| 1038 | if (live_status != LTTNG_LIVE_ITERATOR_STATUS_OK) { |
| 1039 | BT_ASSERT(!*curr_msg); |
| 1040 | } |
| 1041 | |
| 1042 | end: |
| 1043 | if (live_status == LTTNG_LIVE_ITERATOR_STATUS_CONTINUE) { |
| 1044 | BT_COMP_LOGD("Ask the relay daemon for an updated view of the data and metadata streams"); |
| 1045 | goto retry; |
| 1046 | } |
| 1047 | |
| 1048 | BT_COMP_LOGD("Returning from advancing live stream iterator: status=%s, " |
| 1049 | "stream-name=\"%s\", viewer-stream-id=%" PRIu64, |
| 1050 | lttng_live_iterator_status_string(live_status), stream_iter->name->str, |
| 1051 | stream_iter->viewer_stream_id); |
| 1052 | |
| 1053 | return live_status; |
| 1054 | } |
| 1055 | |
| 1056 | static bool is_discarded_packet_or_event_message(const bt_message *msg) |
| 1057 | { |
| 1058 | const enum bt_message_type msg_type = bt_message_get_type(msg); |
| 1059 | |
| 1060 | return msg_type == BT_MESSAGE_TYPE_DISCARDED_EVENTS || |
| 1061 | msg_type == BT_MESSAGE_TYPE_DISCARDED_PACKETS; |
| 1062 | } |
| 1063 | |
| 1064 | static enum lttng_live_iterator_status |
| 1065 | adjust_discarded_packets_message(bt_self_message_iterator *iter, const bt_stream *stream, |
| 1066 | const bt_message *msg_in, bt_message **msg_out, |
| 1067 | uint64_t new_begin_ts) |
| 1068 | { |
| 1069 | enum lttng_live_iterator_status status = LTTNG_LIVE_ITERATOR_STATUS_OK; |
| 1070 | enum bt_property_availability availability; |
| 1071 | const bt_clock_snapshot *clock_snapshot; |
| 1072 | uint64_t end_ts; |
| 1073 | uint64_t count; |
| 1074 | |
| 1075 | clock_snapshot = bt_message_discarded_packets_borrow_end_default_clock_snapshot_const(msg_in); |
| 1076 | end_ts = bt_clock_snapshot_get_value(clock_snapshot); |
| 1077 | |
| 1078 | availability = bt_message_discarded_packets_get_count(msg_in, &count); |
| 1079 | BT_ASSERT_DBG(availability == BT_PROPERTY_AVAILABILITY_AVAILABLE); |
| 1080 | |
| 1081 | *msg_out = bt_message_discarded_packets_create_with_default_clock_snapshots( |
| 1082 | iter, stream, new_begin_ts, end_ts); |
| 1083 | if (!*msg_out) { |
| 1084 | status = LTTNG_LIVE_ITERATOR_STATUS_NOMEM; |
| 1085 | goto end; |
| 1086 | } |
| 1087 | |
| 1088 | bt_message_discarded_packets_set_count(*msg_out, count); |
| 1089 | end: |
| 1090 | return status; |
| 1091 | } |
| 1092 | |
| 1093 | static enum lttng_live_iterator_status |
| 1094 | adjust_discarded_events_message(bt_self_message_iterator *iter, const bt_stream *stream, |
| 1095 | const bt_message *msg_in, bt_message **msg_out, |
| 1096 | uint64_t new_begin_ts) |
| 1097 | { |
| 1098 | enum lttng_live_iterator_status status = LTTNG_LIVE_ITERATOR_STATUS_OK; |
| 1099 | enum bt_property_availability availability; |
| 1100 | const bt_clock_snapshot *clock_snapshot; |
| 1101 | uint64_t end_ts; |
| 1102 | uint64_t count; |
| 1103 | |
| 1104 | clock_snapshot = bt_message_discarded_events_borrow_end_default_clock_snapshot_const(msg_in); |
| 1105 | end_ts = bt_clock_snapshot_get_value(clock_snapshot); |
| 1106 | |
| 1107 | availability = bt_message_discarded_events_get_count(msg_in, &count); |
| 1108 | BT_ASSERT_DBG(availability == BT_PROPERTY_AVAILABILITY_AVAILABLE); |
| 1109 | |
| 1110 | *msg_out = bt_message_discarded_events_create_with_default_clock_snapshots( |
| 1111 | iter, stream, new_begin_ts, end_ts); |
| 1112 | if (!*msg_out) { |
| 1113 | status = LTTNG_LIVE_ITERATOR_STATUS_NOMEM; |
| 1114 | goto end; |
| 1115 | } |
| 1116 | |
| 1117 | bt_message_discarded_events_set_count(*msg_out, count); |
| 1118 | end: |
| 1119 | return status; |
| 1120 | } |
| 1121 | |
| 1122 | static enum lttng_live_iterator_status |
| 1123 | handle_late_message(struct lttng_live_msg_iter *lttng_live_msg_iter, |
| 1124 | struct lttng_live_stream_iterator *stream_iter, int64_t late_msg_ts_ns, |
| 1125 | const bt_message *late_msg) |
| 1126 | { |
| 1127 | bt_self_component *self_comp = lttng_live_msg_iter->self_comp; |
| 1128 | bt_logging_level log_level = lttng_live_msg_iter->log_level; |
| 1129 | const bt_clock_class *clock_class; |
| 1130 | const bt_stream_class *stream_class; |
| 1131 | enum bt_clock_class_cycles_to_ns_from_origin_status ts_ns_status; |
| 1132 | int64_t last_inactivity_ts_ns; |
| 1133 | enum lttng_live_iterator_status stream_iter_status = LTTNG_LIVE_ITERATOR_STATUS_OK; |
| 1134 | enum lttng_live_iterator_status adjust_status; |
| 1135 | bt_message *adjusted_message; |
| 1136 | |
| 1137 | /* |
| 1138 | * The timestamp of the current message is before the last message sent |
| 1139 | * by this component. We CANNOT send it as is. |
| 1140 | * |
| 1141 | * The only expected scenario in which that could happen is the |
| 1142 | * following, everything else is a bug in this component, relay deamon, |
| 1143 | * or CTF parser. |
| 1144 | * |
| 1145 | * Expected scenario: The CTF message iterator emitted discarded |
| 1146 | * packets and discarded events with synthesized beginning and end |
| 1147 | * timestamps from the bounds of the last known packet and the newly |
| 1148 | * decoded packet header. The CTF message iterator is not aware of |
| 1149 | * stream inactivity beacons. Hence, we have to adjust the beginning |
| 1150 | * timestamp of those types of messages if a stream signalled its |
| 1151 | * inactivity up until _after_ the last known packet's beginning |
| 1152 | * timestamp. |
| 1153 | * |
| 1154 | * Otherwise, the monotonicity guarantee of message timestamps would |
| 1155 | * not be preserved. |
| 1156 | * |
| 1157 | * In short, the only scenario in which it's okay and fixable to |
| 1158 | * received a late message is when: |
| 1159 | * 1. the late message is a discarded packets or discarded events |
| 1160 | * message, |
| 1161 | * 2. this stream produced an inactivity message downstream, and |
| 1162 | * 3. the timestamp of the late message is within the inactivity |
| 1163 | * timespan we sent downstream through the inactivity message. |
| 1164 | */ |
| 1165 | |
| 1166 | BT_COMP_LOGD("Handling late message on live stream iterator: " |
| 1167 | "stream-name=\"%s\", viewer-stream-id=%" PRIu64, |
| 1168 | stream_iter->name->str, stream_iter->viewer_stream_id); |
| 1169 | |
| 1170 | if (!stream_iter->last_inactivity_ts.is_set) { |
| 1171 | BT_COMP_LOGE_APPEND_CAUSE(self_comp, "Invalid live stream state: " |
| 1172 | "have a late message when no inactivity message " |
| 1173 | "was ever sent for that stream."); |
| 1174 | stream_iter_status = LTTNG_LIVE_ITERATOR_STATUS_ERROR; |
| 1175 | goto end; |
| 1176 | } |
| 1177 | |
| 1178 | if (!is_discarded_packet_or_event_message(late_msg)) { |
| 1179 | BT_COMP_LOGE_APPEND_CAUSE(self_comp, |
| 1180 | "Invalid live stream state: " |
| 1181 | "have a late message that is not a packet discarded or " |
| 1182 | "event discarded message: late-msg-type=%s", |
| 1183 | bt_common_message_type_string(bt_message_get_type(late_msg))); |
| 1184 | stream_iter_status = LTTNG_LIVE_ITERATOR_STATUS_ERROR; |
| 1185 | goto end; |
| 1186 | } |
| 1187 | |
| 1188 | stream_class = bt_stream_borrow_class_const(stream_iter->stream); |
| 1189 | clock_class = bt_stream_class_borrow_default_clock_class_const(stream_class); |
| 1190 | |
| 1191 | ts_ns_status = bt_clock_class_cycles_to_ns_from_origin( |
| 1192 | clock_class, stream_iter->last_inactivity_ts.value, &last_inactivity_ts_ns); |
| 1193 | if (ts_ns_status != BT_CLOCK_CLASS_CYCLES_TO_NS_FROM_ORIGIN_STATUS_OK) { |
| 1194 | BT_COMP_LOGE_APPEND_CAUSE(self_comp, "Error converting last " |
| 1195 | "inactivity message timestamp to nanoseconds"); |
| 1196 | stream_iter_status = LTTNG_LIVE_ITERATOR_STATUS_ERROR; |
| 1197 | goto end; |
| 1198 | } |
| 1199 | |
| 1200 | if (last_inactivity_ts_ns <= late_msg_ts_ns) { |
| 1201 | BT_COMP_LOGE_APPEND_CAUSE(self_comp, |
| 1202 | "Invalid live stream state: " |
| 1203 | "have a late message that is none included in a stream " |
| 1204 | "inactivity timespan: last-inactivity-ts-ns=%" PRIu64 |
| 1205 | "late-msg-ts-ns=%" PRIu64, |
| 1206 | last_inactivity_ts_ns, late_msg_ts_ns); |
| 1207 | stream_iter_status = LTTNG_LIVE_ITERATOR_STATUS_ERROR; |
| 1208 | goto end; |
| 1209 | } |
| 1210 | |
| 1211 | /* |
| 1212 | * We now know that it's okay for this message to be late, we can now |
| 1213 | * adjust its timestamp to ensure monotonicity. |
| 1214 | */ |
| 1215 | BT_COMP_LOGD("Adjusting the timestamp of late message: late-msg-type=%s, " |
| 1216 | "msg-new-ts-ns=%" PRIu64, |
| 1217 | bt_common_message_type_string(bt_message_get_type(late_msg)), |
| 1218 | stream_iter->last_inactivity_ts.value); |
| 1219 | switch (bt_message_get_type(late_msg)) { |
| 1220 | case BT_MESSAGE_TYPE_DISCARDED_EVENTS: |
| 1221 | adjust_status = adjust_discarded_events_message( |
| 1222 | lttng_live_msg_iter->self_msg_iter, stream_iter->stream, late_msg, &adjusted_message, |
| 1223 | stream_iter->last_inactivity_ts.value); |
| 1224 | break; |
| 1225 | case BT_MESSAGE_TYPE_DISCARDED_PACKETS: |
| 1226 | adjust_status = adjust_discarded_packets_message( |
| 1227 | lttng_live_msg_iter->self_msg_iter, stream_iter->stream, late_msg, &adjusted_message, |
| 1228 | stream_iter->last_inactivity_ts.value); |
| 1229 | break; |
| 1230 | default: |
| 1231 | bt_common_abort(); |
| 1232 | } |
| 1233 | |
| 1234 | if (adjust_status != LTTNG_LIVE_ITERATOR_STATUS_OK) { |
| 1235 | stream_iter_status = adjust_status; |
| 1236 | goto end; |
| 1237 | } |
| 1238 | |
| 1239 | BT_ASSERT_DBG(adjusted_message); |
| 1240 | stream_iter->current_msg = adjusted_message; |
| 1241 | stream_iter->current_msg_ts_ns = last_inactivity_ts_ns; |
| 1242 | bt_message_put_ref(late_msg); |
| 1243 | |
| 1244 | end: |
| 1245 | return stream_iter_status; |
| 1246 | } |
| 1247 | |
| 1248 | static enum lttng_live_iterator_status |
| 1249 | next_stream_iterator_for_trace(struct lttng_live_msg_iter *lttng_live_msg_iter, |
| 1250 | struct lttng_live_trace *live_trace, |
| 1251 | struct lttng_live_stream_iterator **youngest_trace_stream_iter) |
| 1252 | { |
| 1253 | struct lttng_live_stream_iterator *youngest_candidate_stream_iter = NULL; |
| 1254 | bt_logging_level log_level = lttng_live_msg_iter->log_level; |
| 1255 | bt_self_component *self_comp = lttng_live_msg_iter->self_comp; |
| 1256 | enum lttng_live_iterator_status stream_iter_status; |
| 1257 | ; |
| 1258 | int64_t youngest_candidate_msg_ts = INT64_MAX; |
| 1259 | uint64_t stream_iter_idx; |
| 1260 | |
| 1261 | BT_ASSERT_DBG(live_trace); |
| 1262 | BT_ASSERT_DBG(live_trace->stream_iterators); |
| 1263 | |
| 1264 | BT_COMP_LOGD("Finding the next stream iterator for trace: " |
| 1265 | "trace-id=%" PRIu64, |
| 1266 | live_trace->id); |
| 1267 | /* |
| 1268 | * Update the current message of every stream iterators of this trace. |
| 1269 | * The current msg of every stream must have a timestamp equal or |
| 1270 | * larger than the last message returned by this iterator. We must |
| 1271 | * ensure monotonicity. |
| 1272 | */ |
| 1273 | stream_iter_idx = 0; |
| 1274 | while (stream_iter_idx < live_trace->stream_iterators->len) { |
| 1275 | bool stream_iter_is_ended = false; |
| 1276 | struct lttng_live_stream_iterator *stream_iter = |
| 1277 | (lttng_live_stream_iterator *) g_ptr_array_index(live_trace->stream_iterators, |
| 1278 | stream_iter_idx); |
| 1279 | |
| 1280 | /* |
| 1281 | * If there is no current message for this stream, go fetch |
| 1282 | * one. |
| 1283 | */ |
| 1284 | while (!stream_iter->current_msg) { |
| 1285 | const bt_message *msg = NULL; |
| 1286 | int64_t curr_msg_ts_ns = INT64_MAX; |
| 1287 | |
| 1288 | stream_iter_status = |
| 1289 | lttng_live_iterator_next_msg_on_stream(lttng_live_msg_iter, stream_iter, &msg); |
| 1290 | |
| 1291 | if (stream_iter_status == LTTNG_LIVE_ITERATOR_STATUS_END) { |
| 1292 | stream_iter_is_ended = true; |
| 1293 | break; |
| 1294 | } |
| 1295 | |
| 1296 | if (stream_iter_status != LTTNG_LIVE_ITERATOR_STATUS_OK) { |
| 1297 | goto end; |
| 1298 | } |
| 1299 | |
| 1300 | BT_ASSERT_DBG(msg); |
| 1301 | |
| 1302 | BT_COMP_LOGD("Live stream iterator returned message: msg-type=%s, " |
| 1303 | "stream-name=\"%s\", viewer-stream-id=%" PRIu64, |
| 1304 | bt_common_message_type_string(bt_message_get_type(msg)), |
| 1305 | stream_iter->name->str, stream_iter->viewer_stream_id); |
| 1306 | |
| 1307 | /* |
| 1308 | * Get the timestamp in nanoseconds from origin of this |
| 1309 | * messsage. |
| 1310 | */ |
| 1311 | live_get_msg_ts_ns(stream_iter, lttng_live_msg_iter, msg, |
| 1312 | lttng_live_msg_iter->last_msg_ts_ns, &curr_msg_ts_ns); |
| 1313 | |
| 1314 | /* |
| 1315 | * Check if the message of the current live stream |
| 1316 | * iterator occurred at the exact same time or after the |
| 1317 | * last message returned by this component's message |
| 1318 | * iterator. If not, we need to handle it with care. |
| 1319 | */ |
| 1320 | if (curr_msg_ts_ns >= lttng_live_msg_iter->last_msg_ts_ns) { |
| 1321 | stream_iter->current_msg = msg; |
| 1322 | stream_iter->current_msg_ts_ns = curr_msg_ts_ns; |
| 1323 | } else { |
| 1324 | /* |
| 1325 | * We received a message from the past. This |
| 1326 | * may be fixable but it can also be an error. |
| 1327 | */ |
| 1328 | stream_iter_status = |
| 1329 | handle_late_message(lttng_live_msg_iter, stream_iter, curr_msg_ts_ns, msg); |
| 1330 | if (stream_iter_status != LTTNG_LIVE_ITERATOR_STATUS_OK) { |
| 1331 | BT_COMP_LOGE_APPEND_CAUSE(self_comp, |
| 1332 | "Late message could not be handled correctly: " |
| 1333 | "lttng-live-msg-iter-addr=%p, " |
| 1334 | "stream-name=\"%s\", " |
| 1335 | "curr-msg-ts=%" PRId64 ", last-msg-ts=%" PRId64, |
| 1336 | lttng_live_msg_iter, stream_iter->name->str, |
| 1337 | curr_msg_ts_ns, lttng_live_msg_iter->last_msg_ts_ns); |
| 1338 | stream_iter_status = LTTNG_LIVE_ITERATOR_STATUS_ERROR; |
| 1339 | goto end; |
| 1340 | } |
| 1341 | } |
| 1342 | } |
| 1343 | |
| 1344 | BT_ASSERT_DBG(stream_iter != youngest_candidate_stream_iter); |
| 1345 | |
| 1346 | if (!stream_iter_is_ended) { |
| 1347 | if (G_UNLIKELY(youngest_candidate_stream_iter == NULL) || |
| 1348 | stream_iter->current_msg_ts_ns < youngest_candidate_msg_ts) { |
| 1349 | /* |
| 1350 | * Update the current best candidate message |
| 1351 | * for the stream iterator of this live trace |
| 1352 | * to be forwarded downstream. |
| 1353 | */ |
| 1354 | youngest_candidate_msg_ts = stream_iter->current_msg_ts_ns; |
| 1355 | youngest_candidate_stream_iter = stream_iter; |
| 1356 | } else if (stream_iter->current_msg_ts_ns == youngest_candidate_msg_ts) { |
| 1357 | /* |
| 1358 | * Order the messages in an arbitrary but |
| 1359 | * deterministic way. |
| 1360 | */ |
| 1361 | BT_ASSERT_DBG(stream_iter != youngest_candidate_stream_iter); |
| 1362 | int ret = common_muxing_compare_messages( |
| 1363 | stream_iter->current_msg, youngest_candidate_stream_iter->current_msg); |
| 1364 | if (ret < 0) { |
| 1365 | /* |
| 1366 | * The `youngest_candidate_stream_iter->current_msg` |
| 1367 | * should go first. Update the next |
| 1368 | * iterator and the current timestamp. |
| 1369 | */ |
| 1370 | youngest_candidate_msg_ts = stream_iter->current_msg_ts_ns; |
| 1371 | youngest_candidate_stream_iter = stream_iter; |
| 1372 | } else if (ret == 0) { |
| 1373 | /* |
| 1374 | * Unable to pick which one should go |
| 1375 | * first. |
| 1376 | */ |
| 1377 | BT_COMP_LOGW( |
| 1378 | "Cannot deterministically pick next live stream message iterator because they have identical next messages: " |
| 1379 | "stream-iter-addr=%p" |
| 1380 | "stream-iter-addr=%p", |
| 1381 | stream_iter, youngest_candidate_stream_iter); |
| 1382 | } |
| 1383 | } |
| 1384 | |
| 1385 | stream_iter_idx++; |
| 1386 | } else { |
| 1387 | /* |
| 1388 | * The live stream iterator has ended. That |
| 1389 | * iterator is removed from the array, but |
| 1390 | * there is no need to increment |
| 1391 | * stream_iter_idx as |
| 1392 | * g_ptr_array_remove_index_fast replaces the |
| 1393 | * removed element with the array's last |
| 1394 | * element. |
| 1395 | */ |
| 1396 | g_ptr_array_remove_index_fast(live_trace->stream_iterators, stream_iter_idx); |
| 1397 | } |
| 1398 | } |
| 1399 | |
| 1400 | if (youngest_candidate_stream_iter) { |
| 1401 | *youngest_trace_stream_iter = youngest_candidate_stream_iter; |
| 1402 | stream_iter_status = LTTNG_LIVE_ITERATOR_STATUS_OK; |
| 1403 | } else { |
| 1404 | /* |
| 1405 | * The only case where we don't have a candidate for this trace |
| 1406 | * is if we reached the end of all the iterators. |
| 1407 | */ |
| 1408 | BT_ASSERT(live_trace->stream_iterators->len == 0); |
| 1409 | stream_iter_status = LTTNG_LIVE_ITERATOR_STATUS_END; |
| 1410 | } |
| 1411 | |
| 1412 | end: |
| 1413 | return stream_iter_status; |
| 1414 | } |
| 1415 | |
| 1416 | static enum lttng_live_iterator_status |
| 1417 | next_stream_iterator_for_session(struct lttng_live_msg_iter *lttng_live_msg_iter, |
| 1418 | struct lttng_live_session *session, |
| 1419 | struct lttng_live_stream_iterator **youngest_session_stream_iter) |
| 1420 | { |
| 1421 | bt_self_component *self_comp = lttng_live_msg_iter->self_comp; |
| 1422 | bt_logging_level log_level = lttng_live_msg_iter->log_level; |
| 1423 | enum lttng_live_iterator_status stream_iter_status; |
| 1424 | uint64_t trace_idx = 0; |
| 1425 | int64_t youngest_candidate_msg_ts = INT64_MAX; |
| 1426 | struct lttng_live_stream_iterator *youngest_candidate_stream_iter = NULL; |
| 1427 | |
| 1428 | BT_COMP_LOGD("Finding the next stream iterator for session: " |
| 1429 | "session-id=%" PRIu64, |
| 1430 | session->id); |
| 1431 | /* |
| 1432 | * Make sure we are attached to the session and look for new streams |
| 1433 | * and metadata. |
| 1434 | */ |
| 1435 | stream_iter_status = lttng_live_get_session(lttng_live_msg_iter, session); |
| 1436 | if (stream_iter_status != LTTNG_LIVE_ITERATOR_STATUS_OK && |
| 1437 | stream_iter_status != LTTNG_LIVE_ITERATOR_STATUS_CONTINUE && |
| 1438 | stream_iter_status != LTTNG_LIVE_ITERATOR_STATUS_END) { |
| 1439 | goto end; |
| 1440 | } |
| 1441 | |
| 1442 | BT_ASSERT_DBG(session->traces); |
| 1443 | |
| 1444 | while (trace_idx < session->traces->len) { |
| 1445 | bool trace_is_ended = false; |
| 1446 | struct lttng_live_stream_iterator *stream_iter; |
| 1447 | struct lttng_live_trace *trace = |
| 1448 | (lttng_live_trace *) g_ptr_array_index(session->traces, trace_idx); |
| 1449 | |
| 1450 | stream_iter_status = |
| 1451 | next_stream_iterator_for_trace(lttng_live_msg_iter, trace, &stream_iter); |
| 1452 | if (stream_iter_status == LTTNG_LIVE_ITERATOR_STATUS_END) { |
| 1453 | /* |
| 1454 | * All the live stream iterators for this trace are |
| 1455 | * ENDed. Remove the trace from this session. |
| 1456 | */ |
| 1457 | trace_is_ended = true; |
| 1458 | } else if (stream_iter_status != LTTNG_LIVE_ITERATOR_STATUS_OK) { |
| 1459 | goto end; |
| 1460 | } |
| 1461 | |
| 1462 | if (!trace_is_ended) { |
| 1463 | BT_ASSERT_DBG(stream_iter); |
| 1464 | |
| 1465 | if (G_UNLIKELY(youngest_candidate_stream_iter == NULL) || |
| 1466 | stream_iter->current_msg_ts_ns < youngest_candidate_msg_ts) { |
| 1467 | youngest_candidate_msg_ts = stream_iter->current_msg_ts_ns; |
| 1468 | youngest_candidate_stream_iter = stream_iter; |
| 1469 | } else if (stream_iter->current_msg_ts_ns == youngest_candidate_msg_ts) { |
| 1470 | /* |
| 1471 | * Order the messages in an arbitrary but |
| 1472 | * deterministic way. |
| 1473 | */ |
| 1474 | int ret = common_muxing_compare_messages( |
| 1475 | stream_iter->current_msg, youngest_candidate_stream_iter->current_msg); |
| 1476 | if (ret < 0) { |
| 1477 | /* |
| 1478 | * The `youngest_candidate_stream_iter->current_msg` |
| 1479 | * should go first. Update the next iterator |
| 1480 | * and the current timestamp. |
| 1481 | */ |
| 1482 | youngest_candidate_msg_ts = stream_iter->current_msg_ts_ns; |
| 1483 | youngest_candidate_stream_iter = stream_iter; |
| 1484 | } else if (ret == 0) { |
| 1485 | /* Unable to pick which one should go first. */ |
| 1486 | BT_COMP_LOGW( |
| 1487 | "Cannot deterministically pick next live stream message iterator because they have identical next messages: " |
| 1488 | "stream-iter-addr=%p" |
| 1489 | "stream-iter-addr=%p", |
| 1490 | stream_iter, youngest_candidate_stream_iter); |
| 1491 | } |
| 1492 | } |
| 1493 | trace_idx++; |
| 1494 | } else { |
| 1495 | /* |
| 1496 | * trace_idx is not incremented since |
| 1497 | * g_ptr_array_remove_index_fast replaces the |
| 1498 | * element at trace_idx with the array's last element. |
| 1499 | */ |
| 1500 | g_ptr_array_remove_index_fast(session->traces, trace_idx); |
| 1501 | } |
| 1502 | } |
| 1503 | if (youngest_candidate_stream_iter) { |
| 1504 | *youngest_session_stream_iter = youngest_candidate_stream_iter; |
| 1505 | stream_iter_status = LTTNG_LIVE_ITERATOR_STATUS_OK; |
| 1506 | } else { |
| 1507 | /* |
| 1508 | * The only cases where we don't have a candidate for this |
| 1509 | * trace is: |
| 1510 | * 1. if we reached the end of all the iterators of all the |
| 1511 | * traces of this session, |
| 1512 | * 2. if we never had live stream iterator in the first place. |
| 1513 | * |
| 1514 | * In either cases, we return END. |
| 1515 | */ |
| 1516 | BT_ASSERT(session->traces->len == 0); |
| 1517 | stream_iter_status = LTTNG_LIVE_ITERATOR_STATUS_END; |
| 1518 | } |
| 1519 | end: |
| 1520 | return stream_iter_status; |
| 1521 | } |
| 1522 | |
| 1523 | static inline void put_messages(bt_message_array_const msgs, uint64_t count) |
| 1524 | { |
| 1525 | uint64_t i; |
| 1526 | |
| 1527 | for (i = 0; i < count; i++) { |
| 1528 | BT_MESSAGE_PUT_REF_AND_RESET(msgs[i]); |
| 1529 | } |
| 1530 | } |
| 1531 | |
| 1532 | BT_HIDDEN |
| 1533 | bt_message_iterator_class_next_method_status |
| 1534 | lttng_live_msg_iter_next(bt_self_message_iterator *self_msg_it, bt_message_array_const msgs, |
| 1535 | uint64_t capacity, uint64_t *count) |
| 1536 | { |
| 1537 | bt_message_iterator_class_next_method_status status; |
| 1538 | enum lttng_live_viewer_status viewer_status; |
| 1539 | struct lttng_live_msg_iter *lttng_live_msg_iter = |
| 1540 | (struct lttng_live_msg_iter *) bt_self_message_iterator_get_data(self_msg_it); |
| 1541 | struct lttng_live_component *lttng_live = lttng_live_msg_iter->lttng_live_comp; |
| 1542 | bt_self_component *self_comp = lttng_live_msg_iter->self_comp; |
| 1543 | bt_logging_level log_level = lttng_live_msg_iter->log_level; |
| 1544 | enum lttng_live_iterator_status stream_iter_status; |
| 1545 | uint64_t session_idx; |
| 1546 | |
| 1547 | *count = 0; |
| 1548 | |
| 1549 | BT_ASSERT_DBG(lttng_live_msg_iter); |
| 1550 | |
| 1551 | if (G_UNLIKELY(lttng_live_msg_iter->was_interrupted)) { |
| 1552 | /* |
| 1553 | * The iterator was interrupted in a previous call to the |
| 1554 | * `_next()` method. We currently do not support generating |
| 1555 | * messages after such event. The babeltrace2 CLI should never |
| 1556 | * be running the graph after being interrupted. So this check |
| 1557 | * is to prevent other graph users from using this live |
| 1558 | * iterator in an messed up internal state. |
| 1559 | */ |
| 1560 | status = BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_ERROR; |
| 1561 | BT_COMP_LOGE_APPEND_CAUSE( |
| 1562 | self_comp, |
| 1563 | "Message iterator was interrupted during a previous call to the `next()` and currently does not support continuing after such event."); |
| 1564 | goto end; |
| 1565 | } |
| 1566 | |
| 1567 | /* |
| 1568 | * Clear all the invalid message reference that might be left over in |
| 1569 | * the output array. |
| 1570 | */ |
| 1571 | memset(msgs, 0, capacity * sizeof(*msgs)); |
| 1572 | |
| 1573 | /* |
| 1574 | * If no session are exposed on the relay found at the url provided by |
| 1575 | * the user, session count will be 0. In this case, we return status |
| 1576 | * end to return gracefully. |
| 1577 | */ |
| 1578 | if (lttng_live_msg_iter->sessions->len == 0) { |
| 1579 | if (lttng_live->params.sess_not_found_act != SESSION_NOT_FOUND_ACTION_CONTINUE) { |
| 1580 | status = BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_END; |
| 1581 | goto end; |
| 1582 | } else { |
| 1583 | /* |
| 1584 | * The are no more active session for this session |
| 1585 | * name. Retry to create a viewer session for the |
| 1586 | * requested session name. |
| 1587 | */ |
| 1588 | viewer_status = lttng_live_create_viewer_session(lttng_live_msg_iter); |
| 1589 | if (viewer_status != LTTNG_LIVE_VIEWER_STATUS_OK) { |
| 1590 | if (viewer_status == LTTNG_LIVE_VIEWER_STATUS_ERROR) { |
| 1591 | status = BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_ERROR; |
| 1592 | BT_COMP_LOGE_APPEND_CAUSE(self_comp, |
| 1593 | "Error creating LTTng live viewer session"); |
| 1594 | } else if (viewer_status == LTTNG_LIVE_VIEWER_STATUS_INTERRUPTED) { |
| 1595 | status = BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_AGAIN; |
| 1596 | } else { |
| 1597 | bt_common_abort(); |
| 1598 | } |
| 1599 | goto end; |
| 1600 | } |
| 1601 | } |
| 1602 | } |
| 1603 | |
| 1604 | if (lttng_live_msg_iter->active_stream_iter == 0) { |
| 1605 | lttng_live_force_new_streams_and_metadata(lttng_live_msg_iter); |
| 1606 | } |
| 1607 | |
| 1608 | /* |
| 1609 | * Here the muxing of message is done. |
| 1610 | * |
| 1611 | * We need to iterate over all the streams of all the traces of all the |
| 1612 | * viewer sessions in order to get the message with the smallest |
| 1613 | * timestamp. In this case, a session is a viewer session and there is |
| 1614 | * one viewer session per consumer daemon. (UST 32bit, UST 64bit and/or |
| 1615 | * kernel). Each viewer session can have multiple traces, for example, |
| 1616 | * 64bit UST viewer sessions could have multiple per-pid traces. |
| 1617 | * |
| 1618 | * We iterate over the streams of each traces to update and see what is |
| 1619 | * their next message's timestamp. From those timestamps, we select the |
| 1620 | * message with the smallest timestamp as the best candidate message |
| 1621 | * for that trace and do the same thing across all the sessions. |
| 1622 | * |
| 1623 | * We then compare the timestamp of best candidate message of all the |
| 1624 | * sessions to pick the message with the smallest timestamp and we |
| 1625 | * return it. |
| 1626 | */ |
| 1627 | while (*count < capacity) { |
| 1628 | struct lttng_live_stream_iterator *youngest_stream_iter = NULL, |
| 1629 | *candidate_stream_iter = NULL; |
| 1630 | int64_t youngest_msg_ts_ns = INT64_MAX; |
| 1631 | |
| 1632 | BT_ASSERT_DBG(lttng_live_msg_iter->sessions); |
| 1633 | session_idx = 0; |
| 1634 | while (session_idx < lttng_live_msg_iter->sessions->len) { |
| 1635 | struct lttng_live_session *session = (lttng_live_session *) g_ptr_array_index( |
| 1636 | lttng_live_msg_iter->sessions, session_idx); |
| 1637 | |
| 1638 | /* Find the best candidate message to send downstream. */ |
| 1639 | stream_iter_status = next_stream_iterator_for_session(lttng_live_msg_iter, session, |
| 1640 | &candidate_stream_iter); |
| 1641 | |
| 1642 | /* If we receive an END status, it means that either: |
| 1643 | * - Those traces never had active streams (UST with no |
| 1644 | * data produced yet), |
| 1645 | * - All live stream iterators have ENDed.*/ |
| 1646 | if (stream_iter_status == LTTNG_LIVE_ITERATOR_STATUS_END) { |
| 1647 | if (session->closed && session->traces->len == 0) { |
| 1648 | /* |
| 1649 | * Remove the session from the list. |
| 1650 | * session_idx is not modified since |
| 1651 | * g_ptr_array_remove_index_fast |
| 1652 | * replaces the the removed element with |
| 1653 | * the array's last element. |
| 1654 | */ |
| 1655 | g_ptr_array_remove_index_fast(lttng_live_msg_iter->sessions, session_idx); |
| 1656 | } else { |
| 1657 | session_idx++; |
| 1658 | } |
| 1659 | continue; |
| 1660 | } |
| 1661 | |
| 1662 | if (stream_iter_status != LTTNG_LIVE_ITERATOR_STATUS_OK) { |
| 1663 | goto return_status; |
| 1664 | } |
| 1665 | |
| 1666 | if (G_UNLIKELY(youngest_stream_iter == NULL) || |
| 1667 | candidate_stream_iter->current_msg_ts_ns < youngest_msg_ts_ns) { |
| 1668 | youngest_msg_ts_ns = candidate_stream_iter->current_msg_ts_ns; |
| 1669 | youngest_stream_iter = candidate_stream_iter; |
| 1670 | } else if (candidate_stream_iter->current_msg_ts_ns == youngest_msg_ts_ns) { |
| 1671 | /* |
| 1672 | * The currently selected message to be sent |
| 1673 | * downstream next has the exact same timestamp |
| 1674 | * that of the current candidate message. We |
| 1675 | * must break the tie in a predictable manner. |
| 1676 | */ |
| 1677 | BT_COMP_LOGD_STR( |
| 1678 | "Two of the next message candidates have the same timestamps, pick one deterministically."); |
| 1679 | /* |
| 1680 | * Order the messages in an arbitrary but |
| 1681 | * deterministic way. |
| 1682 | */ |
| 1683 | int ret = common_muxing_compare_messages(candidate_stream_iter->current_msg, |
| 1684 | youngest_stream_iter->current_msg); |
| 1685 | if (ret < 0) { |
| 1686 | /* |
| 1687 | * The `candidate_stream_iter->current_msg` |
| 1688 | * should go first. Update the next |
| 1689 | * iterator and the current timestamp. |
| 1690 | */ |
| 1691 | youngest_msg_ts_ns = candidate_stream_iter->current_msg_ts_ns; |
| 1692 | youngest_stream_iter = candidate_stream_iter; |
| 1693 | } else if (ret == 0) { |
| 1694 | /* Unable to pick which one should go first. */ |
| 1695 | BT_COMP_LOGW( |
| 1696 | "Cannot deterministically pick next live stream message iterator because they have identical next messages: " |
| 1697 | "next-stream-iter-addr=%p" |
| 1698 | "candidate-stream-iter-addr=%p", |
| 1699 | youngest_stream_iter, candidate_stream_iter); |
| 1700 | } |
| 1701 | } |
| 1702 | |
| 1703 | session_idx++; |
| 1704 | } |
| 1705 | |
| 1706 | if (!youngest_stream_iter) { |
| 1707 | stream_iter_status = LTTNG_LIVE_ITERATOR_STATUS_AGAIN; |
| 1708 | goto return_status; |
| 1709 | } |
| 1710 | |
| 1711 | BT_ASSERT_DBG(youngest_stream_iter->current_msg); |
| 1712 | /* Ensure monotonicity. */ |
| 1713 | BT_ASSERT_DBG(lttng_live_msg_iter->last_msg_ts_ns <= |
| 1714 | youngest_stream_iter->current_msg_ts_ns); |
| 1715 | |
| 1716 | /* |
| 1717 | * Insert the next message to the message batch. This will set |
| 1718 | * stream iterator current messsage to NULL so that next time |
| 1719 | * we fetch the next message of that stream iterator |
| 1720 | */ |
| 1721 | BT_MESSAGE_MOVE_REF(msgs[*count], youngest_stream_iter->current_msg); |
| 1722 | (*count)++; |
| 1723 | |
| 1724 | /* Update the last timestamp in nanoseconds sent downstream. */ |
| 1725 | lttng_live_msg_iter->last_msg_ts_ns = youngest_msg_ts_ns; |
| 1726 | youngest_stream_iter->current_msg_ts_ns = INT64_MAX; |
| 1727 | |
| 1728 | stream_iter_status = LTTNG_LIVE_ITERATOR_STATUS_OK; |
| 1729 | } |
| 1730 | |
| 1731 | return_status: |
| 1732 | switch (stream_iter_status) { |
| 1733 | case LTTNG_LIVE_ITERATOR_STATUS_OK: |
| 1734 | case LTTNG_LIVE_ITERATOR_STATUS_AGAIN: |
| 1735 | /* |
| 1736 | * If we gathered messages, return _OK even if the graph was |
| 1737 | * interrupted. This allows for the components downstream to at |
| 1738 | * least get the thoses messages. If the graph was indeed |
| 1739 | * interrupted there should not be another _next() call as the |
| 1740 | * application will tear down the graph. This component class |
| 1741 | * doesn't support restarting after an interruption. |
| 1742 | */ |
| 1743 | if (*count > 0) { |
| 1744 | status = BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_OK; |
| 1745 | } else { |
| 1746 | status = BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_AGAIN; |
| 1747 | } |
| 1748 | break; |
| 1749 | case LTTNG_LIVE_ITERATOR_STATUS_END: |
| 1750 | status = BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_END; |
| 1751 | break; |
| 1752 | case LTTNG_LIVE_ITERATOR_STATUS_NOMEM: |
| 1753 | BT_COMP_LOGE_APPEND_CAUSE(self_comp, |
| 1754 | "Memory error preparing the next batch of messages: " |
| 1755 | "live-iter-status=%s", |
| 1756 | lttng_live_iterator_status_string(stream_iter_status)); |
| 1757 | status = BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_MEMORY_ERROR; |
| 1758 | break; |
| 1759 | case LTTNG_LIVE_ITERATOR_STATUS_ERROR: |
| 1760 | case LTTNG_LIVE_ITERATOR_STATUS_INVAL: |
| 1761 | case LTTNG_LIVE_ITERATOR_STATUS_UNSUPPORTED: |
| 1762 | BT_COMP_LOGE_APPEND_CAUSE(self_comp, |
| 1763 | "Error preparing the next batch of messages: " |
| 1764 | "live-iter-status=%s", |
| 1765 | lttng_live_iterator_status_string(stream_iter_status)); |
| 1766 | |
| 1767 | status = BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_ERROR; |
| 1768 | /* Put all existing messages on error. */ |
| 1769 | put_messages(msgs, *count); |
| 1770 | break; |
| 1771 | default: |
| 1772 | bt_common_abort(); |
| 1773 | } |
| 1774 | |
| 1775 | end: |
| 1776 | return status; |
| 1777 | } |
| 1778 | |
| 1779 | static struct lttng_live_msg_iter * |
| 1780 | lttng_live_msg_iter_create(struct lttng_live_component *lttng_live_comp, |
| 1781 | bt_self_message_iterator *self_msg_it) |
| 1782 | { |
| 1783 | bt_self_component *self_comp = lttng_live_comp->self_comp; |
| 1784 | bt_logging_level log_level = lttng_live_comp->log_level; |
| 1785 | |
| 1786 | struct lttng_live_msg_iter *lttng_live_msg_iter = g_new0(struct lttng_live_msg_iter, 1); |
| 1787 | if (!lttng_live_msg_iter) { |
| 1788 | BT_COMP_LOGE_APPEND_CAUSE(self_comp, "Failed to allocate lttng_live_msg_iter"); |
| 1789 | goto end; |
| 1790 | } |
| 1791 | |
| 1792 | lttng_live_msg_iter->log_level = lttng_live_comp->log_level; |
| 1793 | lttng_live_msg_iter->self_comp = lttng_live_comp->self_comp; |
| 1794 | lttng_live_msg_iter->lttng_live_comp = lttng_live_comp; |
| 1795 | lttng_live_msg_iter->self_msg_iter = self_msg_it; |
| 1796 | |
| 1797 | lttng_live_msg_iter->active_stream_iter = 0; |
| 1798 | lttng_live_msg_iter->last_msg_ts_ns = INT64_MIN; |
| 1799 | lttng_live_msg_iter->was_interrupted = false; |
| 1800 | |
| 1801 | lttng_live_msg_iter->sessions = |
| 1802 | g_ptr_array_new_with_free_func((GDestroyNotify) lttng_live_destroy_session); |
| 1803 | BT_ASSERT(lttng_live_msg_iter->sessions); |
| 1804 | |
| 1805 | end: |
| 1806 | return lttng_live_msg_iter; |
| 1807 | } |
| 1808 | |
| 1809 | BT_HIDDEN |
| 1810 | bt_message_iterator_class_initialize_method_status |
| 1811 | lttng_live_msg_iter_init(bt_self_message_iterator *self_msg_it, |
| 1812 | bt_self_message_iterator_configuration *config, |
| 1813 | bt_self_component_port_output *self_port) |
| 1814 | { |
| 1815 | bt_message_iterator_class_initialize_method_status status; |
| 1816 | struct lttng_live_component *lttng_live; |
| 1817 | struct lttng_live_msg_iter *lttng_live_msg_iter; |
| 1818 | enum lttng_live_viewer_status viewer_status; |
| 1819 | bt_logging_level log_level; |
| 1820 | bt_self_component *self_comp = bt_self_message_iterator_borrow_component(self_msg_it); |
| 1821 | |
| 1822 | lttng_live = (lttng_live_component *) bt_self_component_get_data(self_comp); |
| 1823 | log_level = lttng_live->log_level; |
| 1824 | self_comp = lttng_live->self_comp; |
| 1825 | |
| 1826 | /* There can be only one downstream iterator at the same time. */ |
| 1827 | BT_ASSERT(!lttng_live->has_msg_iter); |
| 1828 | lttng_live->has_msg_iter = true; |
| 1829 | |
| 1830 | lttng_live_msg_iter = lttng_live_msg_iter_create(lttng_live, self_msg_it); |
| 1831 | if (!lttng_live_msg_iter) { |
| 1832 | BT_COMP_LOGE_APPEND_CAUSE(self_comp, "Failed to create lttng_live_msg_iter"); |
| 1833 | status = BT_MESSAGE_ITERATOR_CLASS_INITIALIZE_METHOD_STATUS_MEMORY_ERROR; |
| 1834 | goto error; |
| 1835 | } |
| 1836 | |
| 1837 | viewer_status = live_viewer_connection_create( |
| 1838 | self_comp, NULL, log_level, lttng_live->params.url->str, false, lttng_live_msg_iter, |
| 1839 | <tng_live_msg_iter->viewer_connection); |
| 1840 | if (viewer_status != LTTNG_LIVE_VIEWER_STATUS_OK) { |
| 1841 | if (viewer_status == LTTNG_LIVE_VIEWER_STATUS_ERROR) { |
| 1842 | BT_COMP_LOGE_APPEND_CAUSE(self_comp, "Failed to create viewer connection"); |
| 1843 | } else if (viewer_status == LTTNG_LIVE_VIEWER_STATUS_INTERRUPTED) { |
| 1844 | /* |
| 1845 | * Interruption in the _iter_init() method is not |
| 1846 | * supported. Return an error. |
| 1847 | */ |
| 1848 | BT_COMP_LOGE_APPEND_CAUSE(self_comp, "Interrupted while creating viewer connection"); |
| 1849 | } |
| 1850 | |
| 1851 | status = BT_MESSAGE_ITERATOR_CLASS_INITIALIZE_METHOD_STATUS_ERROR; |
| 1852 | goto error; |
| 1853 | } |
| 1854 | |
| 1855 | viewer_status = lttng_live_create_viewer_session(lttng_live_msg_iter); |
| 1856 | if (viewer_status != LTTNG_LIVE_VIEWER_STATUS_OK) { |
| 1857 | if (viewer_status == LTTNG_LIVE_VIEWER_STATUS_ERROR) { |
| 1858 | BT_COMP_LOGE_APPEND_CAUSE(self_comp, "Failed to create viewer session"); |
| 1859 | } else if (viewer_status == LTTNG_LIVE_VIEWER_STATUS_INTERRUPTED) { |
| 1860 | /* |
| 1861 | * Interruption in the _iter_init() method is not |
| 1862 | * supported. Return an error. |
| 1863 | */ |
| 1864 | BT_COMP_LOGE_APPEND_CAUSE(self_comp, "Interrupted when creating viewer session"); |
| 1865 | } |
| 1866 | |
| 1867 | status = BT_MESSAGE_ITERATOR_CLASS_INITIALIZE_METHOD_STATUS_ERROR; |
| 1868 | goto error; |
| 1869 | } |
| 1870 | |
| 1871 | if (lttng_live_msg_iter->sessions->len == 0) { |
| 1872 | switch (lttng_live->params.sess_not_found_act) { |
| 1873 | case SESSION_NOT_FOUND_ACTION_CONTINUE: |
| 1874 | BT_COMP_LOGI( |
| 1875 | "Unable to connect to the requested live viewer session. Keep trying to connect because of " |
| 1876 | "%s=\"%s\" component parameter: url=\"%s\"", |
| 1877 | SESS_NOT_FOUND_ACTION_PARAM, SESS_NOT_FOUND_ACTION_CONTINUE_STR, |
| 1878 | lttng_live->params.url->str); |
| 1879 | break; |
| 1880 | case SESSION_NOT_FOUND_ACTION_FAIL: |
| 1881 | BT_COMP_LOGE_APPEND_CAUSE( |
| 1882 | self_comp, |
| 1883 | "Unable to connect to the requested live viewer session. Fail the message iterator initialization because of %s=\"%s\" " |
| 1884 | "component parameter: url =\"%s\"", |
| 1885 | SESS_NOT_FOUND_ACTION_PARAM, SESS_NOT_FOUND_ACTION_FAIL_STR, |
| 1886 | lttng_live->params.url->str); |
| 1887 | status = BT_MESSAGE_ITERATOR_CLASS_INITIALIZE_METHOD_STATUS_ERROR; |
| 1888 | goto error; |
| 1889 | case SESSION_NOT_FOUND_ACTION_END: |
| 1890 | BT_COMP_LOGI( |
| 1891 | "Unable to connect to the requested live viewer session. End gracefully at the first _next() " |
| 1892 | "call because of %s=\"%s\" component parameter: " |
| 1893 | "url=\"%s\"", |
| 1894 | SESS_NOT_FOUND_ACTION_PARAM, SESS_NOT_FOUND_ACTION_END_STR, |
| 1895 | lttng_live->params.url->str); |
| 1896 | break; |
| 1897 | default: |
| 1898 | bt_common_abort(); |
| 1899 | } |
| 1900 | } |
| 1901 | |
| 1902 | bt_self_message_iterator_set_data(self_msg_it, lttng_live_msg_iter); |
| 1903 | status = BT_MESSAGE_ITERATOR_CLASS_INITIALIZE_METHOD_STATUS_OK; |
| 1904 | goto end; |
| 1905 | |
| 1906 | error: |
| 1907 | lttng_live_msg_iter_destroy(lttng_live_msg_iter); |
| 1908 | end: |
| 1909 | return status; |
| 1910 | } |
| 1911 | |
| 1912 | static struct bt_param_validation_map_value_entry_descr list_sessions_params[] = { |
| 1913 | {URL_PARAM, BT_PARAM_VALIDATION_MAP_VALUE_ENTRY_MANDATORY, |
| 1914 | bt_param_validation_value_descr::makeString()}, |
| 1915 | BT_PARAM_VALIDATION_MAP_VALUE_ENTRY_END}; |
| 1916 | |
| 1917 | static bt_component_class_query_method_status |
| 1918 | lttng_live_query_list_sessions(const bt_value *params, const bt_value **result, |
| 1919 | bt_self_component_class *self_comp_class, bt_logging_level log_level) |
| 1920 | { |
| 1921 | bt_component_class_query_method_status status; |
| 1922 | const bt_value *url_value = NULL; |
| 1923 | const char *url; |
| 1924 | struct live_viewer_connection *viewer_connection = NULL; |
| 1925 | enum lttng_live_viewer_status viewer_status; |
| 1926 | enum bt_param_validation_status validation_status; |
| 1927 | gchar *validate_error = NULL; |
| 1928 | |
| 1929 | validation_status = bt_param_validation_validate(params, list_sessions_params, &validate_error); |
| 1930 | if (validation_status == BT_PARAM_VALIDATION_STATUS_MEMORY_ERROR) { |
| 1931 | status = BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_MEMORY_ERROR; |
| 1932 | goto error; |
| 1933 | } else if (validation_status == BT_PARAM_VALIDATION_STATUS_VALIDATION_ERROR) { |
| 1934 | status = BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_ERROR; |
| 1935 | BT_COMP_CLASS_LOGE_APPEND_CAUSE(self_comp_class, "%s", validate_error); |
| 1936 | goto error; |
| 1937 | } |
| 1938 | |
| 1939 | url_value = bt_value_map_borrow_entry_value_const(params, URL_PARAM); |
| 1940 | url = bt_value_string_get(url_value); |
| 1941 | |
| 1942 | viewer_status = live_viewer_connection_create(NULL, self_comp_class, log_level, url, true, NULL, |
| 1943 | &viewer_connection); |
| 1944 | if (viewer_status != LTTNG_LIVE_VIEWER_STATUS_OK) { |
| 1945 | if (viewer_status == LTTNG_LIVE_VIEWER_STATUS_ERROR) { |
| 1946 | BT_COMP_CLASS_LOGE_APPEND_CAUSE(self_comp_class, "Failed to create viewer connection"); |
| 1947 | status = BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_ERROR; |
| 1948 | } else if (viewer_status == LTTNG_LIVE_VIEWER_STATUS_INTERRUPTED) { |
| 1949 | status = BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_AGAIN; |
| 1950 | } else { |
| 1951 | bt_common_abort(); |
| 1952 | } |
| 1953 | goto error; |
| 1954 | } |
| 1955 | |
| 1956 | status = live_viewer_connection_list_sessions(viewer_connection, result); |
| 1957 | if (status != BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_OK) { |
| 1958 | BT_COMP_CLASS_LOGE_APPEND_CAUSE(self_comp_class, "Failed to list viewer sessions"); |
| 1959 | goto error; |
| 1960 | } |
| 1961 | |
| 1962 | goto end; |
| 1963 | |
| 1964 | error: |
| 1965 | BT_VALUE_PUT_REF_AND_RESET(*result); |
| 1966 | |
| 1967 | if (status >= 0) { |
| 1968 | status = BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_ERROR; |
| 1969 | } |
| 1970 | |
| 1971 | end: |
| 1972 | if (viewer_connection) { |
| 1973 | live_viewer_connection_destroy(viewer_connection); |
| 1974 | } |
| 1975 | |
| 1976 | g_free(validate_error); |
| 1977 | |
| 1978 | return status; |
| 1979 | } |
| 1980 | |
| 1981 | static bt_component_class_query_method_status |
| 1982 | lttng_live_query_support_info(const bt_value *params, const bt_value **result, |
| 1983 | bt_self_component_class *self_comp_class, bt_logging_level log_level) |
| 1984 | { |
| 1985 | bt_component_class_query_method_status status = BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_OK; |
| 1986 | const bt_value *input_type_value; |
| 1987 | const bt_value *input_value; |
| 1988 | double weight = 0; |
| 1989 | struct bt_common_lttng_live_url_parts parts = {0}; |
| 1990 | |
| 1991 | /* Used by the logging macros */ |
| 1992 | __attribute__((unused)) bt_self_component *self_comp = NULL; |
| 1993 | |
| 1994 | *result = NULL; |
| 1995 | input_type_value = bt_value_map_borrow_entry_value_const(params, "type"); |
| 1996 | if (!input_type_value) { |
| 1997 | BT_COMP_CLASS_LOGE_APPEND_CAUSE(self_comp_class, "Missing expected `type` parameter."); |
| 1998 | goto error; |
| 1999 | } |
| 2000 | |
| 2001 | if (!bt_value_is_string(input_type_value)) { |
| 2002 | BT_COMP_CLASS_LOGE_APPEND_CAUSE(self_comp_class, "`type` parameter is not a string value."); |
| 2003 | goto error; |
| 2004 | } |
| 2005 | |
| 2006 | if (strcmp(bt_value_string_get(input_type_value), "string") != 0) { |
| 2007 | /* We don't handle file system paths */ |
| 2008 | goto create_result; |
| 2009 | } |
| 2010 | |
| 2011 | input_value = bt_value_map_borrow_entry_value_const(params, "input"); |
| 2012 | if (!input_value) { |
| 2013 | BT_COMP_CLASS_LOGE_APPEND_CAUSE(self_comp_class, "Missing expected `input` parameter."); |
| 2014 | goto error; |
| 2015 | } |
| 2016 | |
| 2017 | if (!bt_value_is_string(input_value)) { |
| 2018 | BT_COMP_CLASS_LOGE_APPEND_CAUSE(self_comp_class, |
| 2019 | "`input` parameter is not a string value."); |
| 2020 | goto error; |
| 2021 | } |
| 2022 | |
| 2023 | parts = bt_common_parse_lttng_live_url(bt_value_string_get(input_value), NULL, 0); |
| 2024 | if (parts.session_name) { |
| 2025 | /* |
| 2026 | * Looks pretty much like an LTTng live URL: we got the |
| 2027 | * session name part, which forms a complete URL. |
| 2028 | */ |
| 2029 | weight = .75; |
| 2030 | } |
| 2031 | |
| 2032 | create_result: |
| 2033 | *result = bt_value_real_create_init(weight); |
| 2034 | if (!*result) { |
| 2035 | status = BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_MEMORY_ERROR; |
| 2036 | goto error; |
| 2037 | } |
| 2038 | |
| 2039 | goto end; |
| 2040 | |
| 2041 | error: |
| 2042 | if (status >= 0) { |
| 2043 | status = BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_ERROR; |
| 2044 | } |
| 2045 | |
| 2046 | BT_ASSERT(!*result); |
| 2047 | |
| 2048 | end: |
| 2049 | bt_common_destroy_lttng_live_url_parts(&parts); |
| 2050 | return status; |
| 2051 | } |
| 2052 | |
| 2053 | BT_HIDDEN |
| 2054 | bt_component_class_query_method_status lttng_live_query(bt_self_component_class_source *comp_class, |
| 2055 | bt_private_query_executor *priv_query_exec, |
| 2056 | const char *object, const bt_value *params, |
| 2057 | __attribute__((unused)) void *method_data, |
| 2058 | const bt_value **result) |
| 2059 | { |
| 2060 | bt_component_class_query_method_status status = BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_OK; |
| 2061 | bt_self_component *self_comp = NULL; |
| 2062 | bt_self_component_class *self_comp_class = |
| 2063 | bt_self_component_class_source_as_self_component_class(comp_class); |
| 2064 | bt_logging_level log_level = bt_query_executor_get_logging_level( |
| 2065 | bt_private_query_executor_as_query_executor_const(priv_query_exec)); |
| 2066 | |
| 2067 | if (strcmp(object, "sessions") == 0) { |
| 2068 | status = lttng_live_query_list_sessions(params, result, self_comp_class, log_level); |
| 2069 | } else if (strcmp(object, "babeltrace.support-info") == 0) { |
| 2070 | status = lttng_live_query_support_info(params, result, self_comp_class, log_level); |
| 2071 | } else { |
| 2072 | BT_COMP_LOGI("Unknown query object `%s`", object); |
| 2073 | status = BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_UNKNOWN_OBJECT; |
| 2074 | goto end; |
| 2075 | } |
| 2076 | |
| 2077 | end: |
| 2078 | return status; |
| 2079 | } |
| 2080 | |
| 2081 | static void lttng_live_component_destroy_data(struct lttng_live_component *lttng_live) |
| 2082 | { |
| 2083 | if (!lttng_live) { |
| 2084 | return; |
| 2085 | } |
| 2086 | if (lttng_live->params.url) { |
| 2087 | g_string_free(lttng_live->params.url, TRUE); |
| 2088 | } |
| 2089 | g_free(lttng_live); |
| 2090 | } |
| 2091 | |
| 2092 | BT_HIDDEN |
| 2093 | void lttng_live_component_finalize(bt_self_component_source *component) |
| 2094 | { |
| 2095 | lttng_live_component *data = (lttng_live_component *) bt_self_component_get_data( |
| 2096 | bt_self_component_source_as_self_component(component)); |
| 2097 | |
| 2098 | if (!data) { |
| 2099 | return; |
| 2100 | } |
| 2101 | lttng_live_component_destroy_data(data); |
| 2102 | } |
| 2103 | |
| 2104 | static enum session_not_found_action |
| 2105 | parse_session_not_found_action_param(const bt_value *no_session_param) |
| 2106 | { |
| 2107 | enum session_not_found_action action; |
| 2108 | const char *no_session_act_str = bt_value_string_get(no_session_param); |
| 2109 | |
| 2110 | if (strcmp(no_session_act_str, SESS_NOT_FOUND_ACTION_CONTINUE_STR) == 0) { |
| 2111 | action = SESSION_NOT_FOUND_ACTION_CONTINUE; |
| 2112 | } else if (strcmp(no_session_act_str, SESS_NOT_FOUND_ACTION_FAIL_STR) == 0) { |
| 2113 | action = SESSION_NOT_FOUND_ACTION_FAIL; |
| 2114 | } else { |
| 2115 | BT_ASSERT(strcmp(no_session_act_str, SESS_NOT_FOUND_ACTION_END_STR) == 0); |
| 2116 | action = SESSION_NOT_FOUND_ACTION_END; |
| 2117 | } |
| 2118 | |
| 2119 | return action; |
| 2120 | } |
| 2121 | |
| 2122 | static bt_param_validation_value_descr inputs_elem_descr = |
| 2123 | bt_param_validation_value_descr::makeString(); |
| 2124 | |
| 2125 | static const char *sess_not_found_action_choices[] = { |
| 2126 | SESS_NOT_FOUND_ACTION_CONTINUE_STR, |
| 2127 | SESS_NOT_FOUND_ACTION_FAIL_STR, |
| 2128 | SESS_NOT_FOUND_ACTION_END_STR, |
| 2129 | }; |
| 2130 | |
| 2131 | static struct bt_param_validation_map_value_entry_descr params_descr[] = { |
| 2132 | {INPUTS_PARAM, BT_PARAM_VALIDATION_MAP_VALUE_ENTRY_MANDATORY, |
| 2133 | bt_param_validation_value_descr::makeArray(1, 1, inputs_elem_descr)}, |
| 2134 | {SESS_NOT_FOUND_ACTION_PARAM, BT_PARAM_VALIDATION_MAP_VALUE_ENTRY_OPTIONAL, |
| 2135 | bt_param_validation_value_descr::makeString(sess_not_found_action_choices)}, |
| 2136 | BT_PARAM_VALIDATION_MAP_VALUE_ENTRY_END}; |
| 2137 | |
| 2138 | static bt_component_class_initialize_method_status |
| 2139 | lttng_live_component_create(const bt_value *params, bt_logging_level log_level, |
| 2140 | bt_self_component *self_comp, struct lttng_live_component **component) |
| 2141 | { |
| 2142 | struct lttng_live_component *lttng_live = NULL; |
| 2143 | const bt_value *inputs_value; |
| 2144 | const bt_value *url_value; |
| 2145 | const bt_value *value; |
| 2146 | const char *url; |
| 2147 | enum bt_param_validation_status validation_status; |
| 2148 | gchar *validation_error = NULL; |
| 2149 | bt_component_class_initialize_method_status status; |
| 2150 | |
| 2151 | validation_status = bt_param_validation_validate(params, params_descr, &validation_error); |
| 2152 | if (validation_status == BT_PARAM_VALIDATION_STATUS_MEMORY_ERROR) { |
| 2153 | status = BT_COMPONENT_CLASS_INITIALIZE_METHOD_STATUS_MEMORY_ERROR; |
| 2154 | goto error; |
| 2155 | } else if (validation_status == BT_PARAM_VALIDATION_STATUS_VALIDATION_ERROR) { |
| 2156 | BT_COMP_LOGE_APPEND_CAUSE(self_comp, "%s", validation_error); |
| 2157 | status = BT_COMPONENT_CLASS_INITIALIZE_METHOD_STATUS_ERROR; |
| 2158 | goto error; |
| 2159 | } |
| 2160 | |
| 2161 | lttng_live = g_new0(struct lttng_live_component, 1); |
| 2162 | if (!lttng_live) { |
| 2163 | status = BT_COMPONENT_CLASS_INITIALIZE_METHOD_STATUS_MEMORY_ERROR; |
| 2164 | goto end; |
| 2165 | } |
| 2166 | lttng_live->log_level = log_level; |
| 2167 | lttng_live->self_comp = self_comp; |
| 2168 | lttng_live->max_query_size = MAX_QUERY_SIZE; |
| 2169 | lttng_live->has_msg_iter = false; |
| 2170 | |
| 2171 | inputs_value = bt_value_map_borrow_entry_value_const(params, INPUTS_PARAM); |
| 2172 | url_value = bt_value_array_borrow_element_by_index_const(inputs_value, 0); |
| 2173 | url = bt_value_string_get(url_value); |
| 2174 | |
| 2175 | lttng_live->params.url = g_string_new(url); |
| 2176 | if (!lttng_live->params.url) { |
| 2177 | status = BT_COMPONENT_CLASS_INITIALIZE_METHOD_STATUS_MEMORY_ERROR; |
| 2178 | goto error; |
| 2179 | } |
| 2180 | |
| 2181 | value = bt_value_map_borrow_entry_value_const(params, SESS_NOT_FOUND_ACTION_PARAM); |
| 2182 | if (value) { |
| 2183 | lttng_live->params.sess_not_found_act = parse_session_not_found_action_param(value); |
| 2184 | } else { |
| 2185 | BT_COMP_LOGI("Optional `%s` parameter is missing: " |
| 2186 | "defaulting to `%s`.", |
| 2187 | SESS_NOT_FOUND_ACTION_PARAM, SESS_NOT_FOUND_ACTION_CONTINUE_STR); |
| 2188 | lttng_live->params.sess_not_found_act = SESSION_NOT_FOUND_ACTION_CONTINUE; |
| 2189 | } |
| 2190 | |
| 2191 | status = BT_COMPONENT_CLASS_INITIALIZE_METHOD_STATUS_OK; |
| 2192 | goto end; |
| 2193 | |
| 2194 | error: |
| 2195 | lttng_live_component_destroy_data(lttng_live); |
| 2196 | lttng_live = NULL; |
| 2197 | end: |
| 2198 | g_free(validation_error); |
| 2199 | |
| 2200 | *component = lttng_live; |
| 2201 | return status; |
| 2202 | } |
| 2203 | |
| 2204 | BT_HIDDEN |
| 2205 | bt_component_class_initialize_method_status |
| 2206 | lttng_live_component_init(bt_self_component_source *self_comp_src, |
| 2207 | bt_self_component_source_configuration *config, const bt_value *params, |
| 2208 | __attribute__((unused)) void *init_method_data) |
| 2209 | { |
| 2210 | struct lttng_live_component *lttng_live; |
| 2211 | bt_component_class_initialize_method_status ret; |
| 2212 | bt_self_component *self_comp = bt_self_component_source_as_self_component(self_comp_src); |
| 2213 | bt_logging_level log_level = |
| 2214 | bt_component_get_logging_level(bt_self_component_as_component(self_comp)); |
| 2215 | bt_self_component_add_port_status add_port_status; |
| 2216 | |
| 2217 | ret = lttng_live_component_create(params, log_level, self_comp, <tng_live); |
| 2218 | if (ret != BT_COMPONENT_CLASS_INITIALIZE_METHOD_STATUS_OK) { |
| 2219 | goto error; |
| 2220 | } |
| 2221 | |
| 2222 | add_port_status = bt_self_component_source_add_output_port(self_comp_src, "out", NULL, NULL); |
| 2223 | if (add_port_status != BT_SELF_COMPONENT_ADD_PORT_STATUS_OK) { |
| 2224 | ret = (bt_component_class_initialize_method_status) add_port_status; |
| 2225 | goto end; |
| 2226 | } |
| 2227 | |
| 2228 | bt_self_component_set_data(self_comp, lttng_live); |
| 2229 | goto end; |
| 2230 | |
| 2231 | error: |
| 2232 | lttng_live_component_destroy_data(lttng_live); |
| 2233 | lttng_live = NULL; |
| 2234 | end: |
| 2235 | return ret; |
| 2236 | } |