| 1 | /* |
| 2 | * lttng-live.c |
| 3 | * |
| 4 | * Babeltrace CTF LTTng-live Client Component |
| 5 | * |
| 6 | * Copyright 2016 Jérémie Galarneau <jeremie.galarneau@efficios.com> |
| 7 | * Copyright 2016 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
| 8 | * |
| 9 | * Author: Jérémie Galarneau <jeremie.galarneau@efficios.com> |
| 10 | * |
| 11 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
| 12 | * of this software and associated documentation files (the "Software"), to deal |
| 13 | * in the Software without restriction, including without limitation the rights |
| 14 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| 15 | * copies of the Software, and to permit persons to whom the Software is |
| 16 | * furnished to do so, subject to the following conditions: |
| 17 | * |
| 18 | * The above copyright notice and this permission notice shall be included in |
| 19 | * all copies or substantial portions of the Software. |
| 20 | * |
| 21 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 22 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 23 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| 24 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 25 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 26 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
| 27 | * SOFTWARE. |
| 28 | */ |
| 29 | |
| 30 | #define BT_LOG_TAG "PLUGIN-CTF-LTTNG-LIVE-SRC" |
| 31 | #include "logging.h" |
| 32 | |
| 33 | #include <babeltrace/ctf-ir/packet.h> |
| 34 | #include <babeltrace/graph/component-source.h> |
| 35 | #include <babeltrace/graph/private-port.h> |
| 36 | #include <babeltrace/graph/port.h> |
| 37 | #include <babeltrace/graph/private-component.h> |
| 38 | #include <babeltrace/graph/private-component-source.h> |
| 39 | #include <babeltrace/graph/private-notification-iterator.h> |
| 40 | #include <babeltrace/graph/notification-stream.h> |
| 41 | #include <babeltrace/graph/notification-packet.h> |
| 42 | #include <babeltrace/graph/notification-event.h> |
| 43 | #include <babeltrace/graph/notification-heap.h> |
| 44 | #include <babeltrace/graph/notification-iterator.h> |
| 45 | #include <babeltrace/graph/notification-inactivity.h> |
| 46 | #include <babeltrace/graph/graph.h> |
| 47 | #include <babeltrace/compiler-internal.h> |
| 48 | #include <inttypes.h> |
| 49 | #include <glib.h> |
| 50 | #include <assert.h> |
| 51 | #include <unistd.h> |
| 52 | #include <plugins-common.h> |
| 53 | |
| 54 | #include "data-stream.h" |
| 55 | #include "metadata.h" |
| 56 | #include "lttng-live-internal.h" |
| 57 | |
| 58 | #define MAX_QUERY_SIZE (256*1024) |
| 59 | |
| 60 | #define print_dbg(fmt, ...) BT_LOGD(fmt, ## __VA_ARGS__) |
| 61 | |
| 62 | static const char *print_state(struct lttng_live_stream_iterator *s) |
| 63 | { |
| 64 | switch (s->state) { |
| 65 | case LTTNG_LIVE_STREAM_ACTIVE_NO_DATA: |
| 66 | return "ACTIVE_NO_DATA"; |
| 67 | case LTTNG_LIVE_STREAM_QUIESCENT_NO_DATA: |
| 68 | return "QUIESCENT_NO_DATA"; |
| 69 | case LTTNG_LIVE_STREAM_QUIESCENT: |
| 70 | return "QUIESCENT"; |
| 71 | case LTTNG_LIVE_STREAM_ACTIVE_DATA: |
| 72 | return "ACTIVE_DATA"; |
| 73 | case LTTNG_LIVE_STREAM_EOF: |
| 74 | return "EOF"; |
| 75 | default: |
| 76 | return "ERROR"; |
| 77 | } |
| 78 | } |
| 79 | |
| 80 | #define print_stream_state(stream) \ |
| 81 | print_dbg("stream %s state %s last_inact_ts %" PRId64 " cur_inact_ts %" PRId64, \ |
| 82 | bt_port_get_name(bt_port_from_private_port(stream->port)), \ |
| 83 | print_state(stream), stream->last_returned_inactivity_timestamp, \ |
| 84 | stream->current_inactivity_timestamp) |
| 85 | |
| 86 | BT_HIDDEN |
| 87 | int lttng_live_add_port(struct lttng_live_component *lttng_live, |
| 88 | struct lttng_live_stream_iterator *stream_iter) |
| 89 | { |
| 90 | int ret; |
| 91 | struct bt_private_port *private_port; |
| 92 | char name[STREAM_NAME_MAX_LEN]; |
| 93 | |
| 94 | ret = sprintf(name, STREAM_NAME_PREFIX "%" PRIu64, stream_iter->viewer_stream_id); |
| 95 | assert(ret > 0); |
| 96 | strcpy(stream_iter->name, name); |
| 97 | ret = bt_private_component_source_add_output_private_port( |
| 98 | lttng_live->private_component, name, stream_iter, |
| 99 | &private_port); |
| 100 | if (ret) { |
| 101 | return -1; |
| 102 | } |
| 103 | BT_LOGI("Added port %s", name); |
| 104 | |
| 105 | if (lttng_live->no_stream_port) { |
| 106 | ret = bt_private_port_remove_from_component(lttng_live->no_stream_port); |
| 107 | if (ret) { |
| 108 | return -1; |
| 109 | } |
| 110 | BT_PUT(lttng_live->no_stream_port); |
| 111 | lttng_live->no_stream_iter->port = NULL; |
| 112 | } |
| 113 | stream_iter->port = private_port; |
| 114 | return 0; |
| 115 | } |
| 116 | |
| 117 | BT_HIDDEN |
| 118 | int lttng_live_remove_port(struct lttng_live_component *lttng_live, |
| 119 | struct bt_private_port *port) |
| 120 | { |
| 121 | struct bt_component *component; |
| 122 | int64_t nr_ports; |
| 123 | int ret; |
| 124 | |
| 125 | component = bt_component_from_private_component(lttng_live->private_component); |
| 126 | nr_ports = bt_component_source_get_output_port_count(component); |
| 127 | if (nr_ports < 0) { |
| 128 | return -1; |
| 129 | } |
| 130 | BT_PUT(component); |
| 131 | if (nr_ports == 1) { |
| 132 | assert(!lttng_live->no_stream_port); |
| 133 | ret = bt_private_component_source_add_output_private_port(lttng_live->private_component, |
| 134 | "no-stream", lttng_live->no_stream_iter, |
| 135 | <tng_live->no_stream_port); |
| 136 | if (ret) { |
| 137 | return -1; |
| 138 | } |
| 139 | lttng_live->no_stream_iter->port = lttng_live->no_stream_port; |
| 140 | } |
| 141 | ret = bt_private_port_remove_from_component(port); |
| 142 | if (ret) { |
| 143 | return -1; |
| 144 | } |
| 145 | return 0; |
| 146 | } |
| 147 | |
| 148 | static |
| 149 | struct lttng_live_trace *lttng_live_find_trace(struct lttng_live_session *session, |
| 150 | uint64_t trace_id) |
| 151 | { |
| 152 | struct lttng_live_trace *trace; |
| 153 | |
| 154 | bt_list_for_each_entry(trace, &session->traces, node) { |
| 155 | if (trace->id == trace_id) { |
| 156 | return trace; |
| 157 | } |
| 158 | } |
| 159 | return NULL; |
| 160 | } |
| 161 | |
| 162 | static |
| 163 | void lttng_live_destroy_trace(struct bt_object *obj) |
| 164 | { |
| 165 | struct lttng_live_trace *trace = container_of(obj, struct lttng_live_trace, obj); |
| 166 | int retval; |
| 167 | |
| 168 | BT_LOGI("Destroy trace"); |
| 169 | assert(bt_list_empty(&trace->streams)); |
| 170 | bt_list_del(&trace->node); |
| 171 | |
| 172 | retval = bt_ctf_trace_set_is_static(trace->trace); |
| 173 | assert(!retval); |
| 174 | |
| 175 | lttng_live_metadata_fini(trace); |
| 176 | BT_PUT(trace->cc_prio_map); |
| 177 | g_free(trace); |
| 178 | } |
| 179 | |
| 180 | static |
| 181 | struct lttng_live_trace *lttng_live_create_trace(struct lttng_live_session *session, |
| 182 | uint64_t trace_id) |
| 183 | { |
| 184 | struct lttng_live_trace *trace = NULL; |
| 185 | |
| 186 | trace = g_new0(struct lttng_live_trace, 1); |
| 187 | if (!trace) { |
| 188 | goto error; |
| 189 | } |
| 190 | trace->session = session; |
| 191 | trace->id = trace_id; |
| 192 | BT_INIT_LIST_HEAD(&trace->streams); |
| 193 | trace->new_metadata_needed = true; |
| 194 | bt_list_add(&trace->node, &session->traces); |
| 195 | bt_object_init(&trace->obj, lttng_live_destroy_trace); |
| 196 | BT_LOGI("Create trace"); |
| 197 | goto end; |
| 198 | error: |
| 199 | g_free(trace); |
| 200 | trace = NULL; |
| 201 | end: |
| 202 | return trace; |
| 203 | } |
| 204 | |
| 205 | BT_HIDDEN |
| 206 | struct lttng_live_trace *lttng_live_ref_trace(struct lttng_live_session *session, |
| 207 | uint64_t trace_id) |
| 208 | { |
| 209 | struct lttng_live_trace *trace; |
| 210 | |
| 211 | trace = lttng_live_find_trace(session, trace_id); |
| 212 | if (trace) { |
| 213 | bt_get(trace); |
| 214 | return trace; |
| 215 | } |
| 216 | return lttng_live_create_trace(session, trace_id); |
| 217 | } |
| 218 | |
| 219 | BT_HIDDEN |
| 220 | void lttng_live_unref_trace(struct lttng_live_trace *trace) |
| 221 | { |
| 222 | bt_put(trace); |
| 223 | } |
| 224 | |
| 225 | static |
| 226 | void lttng_live_close_trace_streams(struct lttng_live_trace *trace) |
| 227 | { |
| 228 | struct lttng_live_stream_iterator *stream, *s; |
| 229 | |
| 230 | bt_list_for_each_entry_safe(stream, s, &trace->streams, node) { |
| 231 | lttng_live_stream_iterator_destroy(stream); |
| 232 | } |
| 233 | lttng_live_metadata_fini(trace); |
| 234 | } |
| 235 | |
| 236 | BT_HIDDEN |
| 237 | int lttng_live_add_session(struct lttng_live_component *lttng_live, |
| 238 | uint64_t session_id, const char *hostname, |
| 239 | const char *session_name) |
| 240 | { |
| 241 | int ret = 0; |
| 242 | struct lttng_live_session *s; |
| 243 | |
| 244 | s = g_new0(struct lttng_live_session, 1); |
| 245 | if (!s) { |
| 246 | goto error; |
| 247 | } |
| 248 | |
| 249 | s->id = session_id; |
| 250 | BT_INIT_LIST_HEAD(&s->traces); |
| 251 | s->lttng_live = lttng_live; |
| 252 | s->new_streams_needed = true; |
| 253 | s->hostname = g_string_new(hostname); |
| 254 | s->session_name = g_string_new(session_name); |
| 255 | |
| 256 | BT_LOGI("Reading from session: %" PRIu64 " hostname: %s session_name: %s", |
| 257 | s->id, hostname, session_name); |
| 258 | bt_list_add(&s->node, <tng_live->sessions); |
| 259 | goto end; |
| 260 | error: |
| 261 | BT_LOGE("Error adding session"); |
| 262 | g_free(s); |
| 263 | ret = -1; |
| 264 | end: |
| 265 | return ret; |
| 266 | } |
| 267 | |
| 268 | static |
| 269 | void lttng_live_destroy_session(struct lttng_live_session *session) |
| 270 | { |
| 271 | struct lttng_live_trace *trace, *t; |
| 272 | |
| 273 | BT_LOGI("Destroy session"); |
| 274 | if (session->id != -1ULL) { |
| 275 | if (lttng_live_detach_session(session)) { |
| 276 | if (!bt_graph_is_canceled(session->lttng_live->graph)) { |
| 277 | /* Old relayd cannot detach sessions. */ |
| 278 | BT_LOGD("Unable to detach session %" PRIu64, |
| 279 | session->id); |
| 280 | } |
| 281 | } |
| 282 | session->id = -1ULL; |
| 283 | } |
| 284 | bt_list_for_each_entry_safe(trace, t, &session->traces, node) { |
| 285 | lttng_live_close_trace_streams(trace); |
| 286 | } |
| 287 | bt_list_del(&session->node); |
| 288 | if (session->hostname) { |
| 289 | g_string_free(session->hostname, TRUE); |
| 290 | } |
| 291 | if (session->session_name) { |
| 292 | g_string_free(session->session_name, TRUE); |
| 293 | } |
| 294 | g_free(session); |
| 295 | } |
| 296 | |
| 297 | BT_HIDDEN |
| 298 | void lttng_live_iterator_finalize(struct bt_private_notification_iterator *it) |
| 299 | { |
| 300 | struct lttng_live_stream_iterator_generic *s = |
| 301 | bt_private_notification_iterator_get_user_data(it); |
| 302 | |
| 303 | switch (s->type) { |
| 304 | case LIVE_STREAM_TYPE_NO_STREAM: |
| 305 | { |
| 306 | /* Leave no_stream_iter in place when port is removed. */ |
| 307 | break; |
| 308 | } |
| 309 | case LIVE_STREAM_TYPE_STREAM: |
| 310 | { |
| 311 | struct lttng_live_stream_iterator *stream_iter = |
| 312 | container_of(s, struct lttng_live_stream_iterator, p); |
| 313 | |
| 314 | lttng_live_stream_iterator_destroy(stream_iter); |
| 315 | break; |
| 316 | } |
| 317 | } |
| 318 | } |
| 319 | |
| 320 | static |
| 321 | enum bt_ctf_lttng_live_iterator_status lttng_live_iterator_next_check_stream_state( |
| 322 | struct lttng_live_component *lttng_live, |
| 323 | struct lttng_live_stream_iterator *lttng_live_stream) |
| 324 | { |
| 325 | switch (lttng_live_stream->state) { |
| 326 | case LTTNG_LIVE_STREAM_QUIESCENT: |
| 327 | case LTTNG_LIVE_STREAM_ACTIVE_DATA: |
| 328 | break; |
| 329 | case LTTNG_LIVE_STREAM_ACTIVE_NO_DATA: |
| 330 | /* Invalid state. */ |
| 331 | BT_LOGF("Unexpected stream state \"ACTIVE_NO_DATA\""); |
| 332 | abort(); |
| 333 | case LTTNG_LIVE_STREAM_QUIESCENT_NO_DATA: |
| 334 | /* Invalid state. */ |
| 335 | BT_LOGF("Unexpected stream state \"QUIESCENT_NO_DATA\""); |
| 336 | abort(); |
| 337 | case LTTNG_LIVE_STREAM_EOF: |
| 338 | break; |
| 339 | } |
| 340 | return BT_CTF_LTTNG_LIVE_ITERATOR_STATUS_OK; |
| 341 | } |
| 342 | |
| 343 | /* |
| 344 | * For active no data stream, fetch next data. It can be either: |
| 345 | * - quiescent: need to put it in the prio heap at quiescent end |
| 346 | * timestamp, |
| 347 | * - have data: need to wire up first event into the prio heap, |
| 348 | * - have no data on this stream at this point: need to retry (AGAIN) or |
| 349 | * return EOF. |
| 350 | */ |
| 351 | static |
| 352 | enum bt_ctf_lttng_live_iterator_status lttng_live_iterator_next_handle_one_no_data_stream( |
| 353 | struct lttng_live_component *lttng_live, |
| 354 | struct lttng_live_stream_iterator *lttng_live_stream) |
| 355 | { |
| 356 | enum bt_ctf_lttng_live_iterator_status ret = |
| 357 | BT_CTF_LTTNG_LIVE_ITERATOR_STATUS_OK; |
| 358 | struct packet_index index; |
| 359 | enum lttng_live_stream_state orig_state = lttng_live_stream->state; |
| 360 | |
| 361 | if (lttng_live_stream->trace->new_metadata_needed) { |
| 362 | ret = BT_CTF_LTTNG_LIVE_ITERATOR_STATUS_CONTINUE; |
| 363 | goto end; |
| 364 | } |
| 365 | if (lttng_live_stream->trace->session->new_streams_needed) { |
| 366 | ret = BT_CTF_LTTNG_LIVE_ITERATOR_STATUS_CONTINUE; |
| 367 | goto end; |
| 368 | } |
| 369 | if (lttng_live_stream->state != LTTNG_LIVE_STREAM_ACTIVE_NO_DATA |
| 370 | && lttng_live_stream->state != LTTNG_LIVE_STREAM_QUIESCENT_NO_DATA) { |
| 371 | goto end; |
| 372 | } |
| 373 | ret = lttng_live_get_next_index(lttng_live, lttng_live_stream, &index); |
| 374 | if (ret != BT_CTF_LTTNG_LIVE_ITERATOR_STATUS_OK) { |
| 375 | goto end; |
| 376 | } |
| 377 | assert(lttng_live_stream->state != LTTNG_LIVE_STREAM_EOF); |
| 378 | if (lttng_live_stream->state == LTTNG_LIVE_STREAM_QUIESCENT) { |
| 379 | if (orig_state == LTTNG_LIVE_STREAM_QUIESCENT_NO_DATA |
| 380 | && lttng_live_stream->last_returned_inactivity_timestamp == |
| 381 | lttng_live_stream->current_inactivity_timestamp) { |
| 382 | ret = BT_CTF_LTTNG_LIVE_ITERATOR_STATUS_AGAIN; |
| 383 | print_stream_state(lttng_live_stream); |
| 384 | } else { |
| 385 | ret = BT_CTF_LTTNG_LIVE_ITERATOR_STATUS_CONTINUE; |
| 386 | } |
| 387 | goto end; |
| 388 | } |
| 389 | lttng_live_stream->base_offset = index.offset; |
| 390 | lttng_live_stream->offset = index.offset; |
| 391 | lttng_live_stream->len = index.packet_size / CHAR_BIT; |
| 392 | end: |
| 393 | if (ret == BT_CTF_LTTNG_LIVE_ITERATOR_STATUS_OK) { |
| 394 | ret = lttng_live_iterator_next_check_stream_state( |
| 395 | lttng_live, lttng_live_stream); |
| 396 | } |
| 397 | return ret; |
| 398 | } |
| 399 | |
| 400 | /* |
| 401 | * Creation of the notification requires the ctf trace to be created |
| 402 | * beforehand, but the live protocol gives us all streams (including |
| 403 | * metadata) at once. So we split it in three steps: getting streams, |
| 404 | * getting metadata (which creates the ctf trace), and then creating the |
| 405 | * per-stream notifications. |
| 406 | */ |
| 407 | static |
| 408 | enum bt_ctf_lttng_live_iterator_status lttng_live_get_session( |
| 409 | struct lttng_live_component *lttng_live, |
| 410 | struct lttng_live_session *session) |
| 411 | { |
| 412 | enum bt_ctf_lttng_live_iterator_status status; |
| 413 | struct lttng_live_trace *trace, *t; |
| 414 | |
| 415 | if (lttng_live_attach_session(session)) { |
| 416 | if (bt_graph_is_canceled(lttng_live->graph)) { |
| 417 | return BT_CTF_LTTNG_LIVE_ITERATOR_STATUS_AGAIN; |
| 418 | } else { |
| 419 | return BT_CTF_LTTNG_LIVE_ITERATOR_STATUS_ERROR; |
| 420 | } |
| 421 | } |
| 422 | status = lttng_live_get_new_streams(session); |
| 423 | if (status != BT_CTF_LTTNG_LIVE_ITERATOR_STATUS_OK && |
| 424 | status != BT_CTF_LTTNG_LIVE_ITERATOR_STATUS_END) { |
| 425 | return status; |
| 426 | } |
| 427 | bt_list_for_each_entry_safe(trace, t, &session->traces, node) { |
| 428 | status = lttng_live_metadata_update(trace); |
| 429 | if (status != BT_CTF_LTTNG_LIVE_ITERATOR_STATUS_OK && |
| 430 | status != BT_CTF_LTTNG_LIVE_ITERATOR_STATUS_END) { |
| 431 | return status; |
| 432 | } |
| 433 | } |
| 434 | return lttng_live_lazy_notif_init(session); |
| 435 | } |
| 436 | |
| 437 | BT_HIDDEN |
| 438 | void lttng_live_need_new_streams(struct lttng_live_component *lttng_live) |
| 439 | { |
| 440 | struct lttng_live_session *session; |
| 441 | |
| 442 | bt_list_for_each_entry(session, <tng_live->sessions, node) { |
| 443 | session->new_streams_needed = true; |
| 444 | } |
| 445 | } |
| 446 | |
| 447 | static |
| 448 | void lttng_live_force_new_streams_and_metadata(struct lttng_live_component *lttng_live) |
| 449 | { |
| 450 | struct lttng_live_session *session; |
| 451 | |
| 452 | bt_list_for_each_entry(session, <tng_live->sessions, node) { |
| 453 | struct lttng_live_trace *trace; |
| 454 | |
| 455 | session->new_streams_needed = true; |
| 456 | bt_list_for_each_entry(trace, &session->traces, node) { |
| 457 | trace->new_metadata_needed = true; |
| 458 | } |
| 459 | } |
| 460 | } |
| 461 | |
| 462 | static |
| 463 | enum bt_ctf_lttng_live_iterator_status lttng_live_iterator_next_handle_new_streams_and_metadata( |
| 464 | struct lttng_live_component *lttng_live) |
| 465 | { |
| 466 | enum bt_ctf_lttng_live_iterator_status ret = |
| 467 | BT_CTF_LTTNG_LIVE_ITERATOR_STATUS_OK; |
| 468 | unsigned int nr_sessions_opened = 0; |
| 469 | struct lttng_live_session *session, *s; |
| 470 | |
| 471 | bt_list_for_each_entry_safe(session, s, <tng_live->sessions, node) { |
| 472 | if (session->closed && bt_list_empty(&session->traces)) { |
| 473 | lttng_live_destroy_session(session); |
| 474 | } |
| 475 | } |
| 476 | /* |
| 477 | * Currently, when there are no sessions, we quit immediately. |
| 478 | * We may want to add a component parameter to keep trying until |
| 479 | * we get data in the future. |
| 480 | * Also, in a remotely distant future, we could add a "new |
| 481 | * session" flag to the protocol, which would tell us that we |
| 482 | * need to query for new sessions even though we have sessions |
| 483 | * currently ongoing. |
| 484 | */ |
| 485 | if (bt_list_empty(<tng_live->sessions)) { |
| 486 | ret = BT_CTF_LTTNG_LIVE_ITERATOR_STATUS_END; |
| 487 | goto end; |
| 488 | } |
| 489 | bt_list_for_each_entry(session, <tng_live->sessions, node) { |
| 490 | ret = lttng_live_get_session(lttng_live, session); |
| 491 | switch (ret) { |
| 492 | case BT_CTF_LTTNG_LIVE_ITERATOR_STATUS_OK: |
| 493 | break; |
| 494 | case BT_CTF_LTTNG_LIVE_ITERATOR_STATUS_END: |
| 495 | ret = BT_CTF_LTTNG_LIVE_ITERATOR_STATUS_OK; |
| 496 | break; |
| 497 | default: |
| 498 | goto end; |
| 499 | } |
| 500 | if (!session->closed) { |
| 501 | nr_sessions_opened++; |
| 502 | } |
| 503 | } |
| 504 | end: |
| 505 | if (ret == BT_CTF_LTTNG_LIVE_ITERATOR_STATUS_OK && !nr_sessions_opened) { |
| 506 | ret = BT_CTF_LTTNG_LIVE_ITERATOR_STATUS_END; |
| 507 | } |
| 508 | return ret; |
| 509 | } |
| 510 | |
| 511 | static |
| 512 | enum bt_ctf_lttng_live_iterator_status emit_inactivity_notification( |
| 513 | struct lttng_live_component *lttng_live, |
| 514 | struct lttng_live_stream_iterator *lttng_live_stream, |
| 515 | struct bt_notification **notification, |
| 516 | uint64_t timestamp) |
| 517 | { |
| 518 | enum bt_ctf_lttng_live_iterator_status ret = |
| 519 | BT_CTF_LTTNG_LIVE_ITERATOR_STATUS_OK; |
| 520 | struct lttng_live_trace *trace; |
| 521 | struct bt_ctf_clock_class *clock_class = NULL; |
| 522 | struct bt_ctf_clock_value *clock_value = NULL; |
| 523 | struct bt_notification *notif = NULL; |
| 524 | int retval; |
| 525 | |
| 526 | trace = lttng_live_stream->trace; |
| 527 | if (!trace) { |
| 528 | goto error; |
| 529 | } |
| 530 | clock_class = bt_clock_class_priority_map_get_clock_class_by_index(trace->cc_prio_map, 0); |
| 531 | if (!clock_class) { |
| 532 | goto error; |
| 533 | } |
| 534 | clock_value = bt_ctf_clock_value_create(clock_class, timestamp); |
| 535 | if (!clock_value) { |
| 536 | goto error; |
| 537 | } |
| 538 | notif = bt_notification_inactivity_create(trace->cc_prio_map); |
| 539 | if (!notif) { |
| 540 | goto error; |
| 541 | } |
| 542 | retval = bt_notification_inactivity_set_clock_value(notif, clock_value); |
| 543 | if (retval) { |
| 544 | goto error; |
| 545 | } |
| 546 | *notification = notif; |
| 547 | end: |
| 548 | bt_put(clock_value); |
| 549 | bt_put(clock_class); |
| 550 | return ret; |
| 551 | |
| 552 | error: |
| 553 | ret = BT_CTF_LTTNG_LIVE_ITERATOR_STATUS_ERROR; |
| 554 | bt_put(notif); |
| 555 | goto end; |
| 556 | } |
| 557 | |
| 558 | static |
| 559 | enum bt_ctf_lttng_live_iterator_status lttng_live_iterator_next_handle_one_quiescent_stream( |
| 560 | struct lttng_live_component *lttng_live, |
| 561 | struct lttng_live_stream_iterator *lttng_live_stream, |
| 562 | struct bt_notification **notification) |
| 563 | { |
| 564 | enum bt_ctf_lttng_live_iterator_status ret = |
| 565 | BT_CTF_LTTNG_LIVE_ITERATOR_STATUS_OK; |
| 566 | struct bt_ctf_clock_class *clock_class = NULL; |
| 567 | struct bt_ctf_clock_value *clock_value = NULL; |
| 568 | |
| 569 | if (lttng_live_stream->state != LTTNG_LIVE_STREAM_QUIESCENT) { |
| 570 | return BT_CTF_LTTNG_LIVE_ITERATOR_STATUS_OK; |
| 571 | } |
| 572 | |
| 573 | if (lttng_live_stream->current_inactivity_timestamp == |
| 574 | lttng_live_stream->last_returned_inactivity_timestamp) { |
| 575 | lttng_live_stream->state = LTTNG_LIVE_STREAM_QUIESCENT_NO_DATA; |
| 576 | ret = BT_CTF_LTTNG_LIVE_ITERATOR_STATUS_CONTINUE; |
| 577 | goto end; |
| 578 | } |
| 579 | |
| 580 | ret = emit_inactivity_notification(lttng_live, lttng_live_stream, notification, |
| 581 | (uint64_t) lttng_live_stream->current_inactivity_timestamp); |
| 582 | |
| 583 | lttng_live_stream->last_returned_inactivity_timestamp = |
| 584 | lttng_live_stream->current_inactivity_timestamp; |
| 585 | end: |
| 586 | bt_put(clock_value); |
| 587 | bt_put(clock_class); |
| 588 | return ret; |
| 589 | } |
| 590 | |
| 591 | static |
| 592 | enum bt_ctf_lttng_live_iterator_status lttng_live_iterator_next_handle_one_active_data_stream( |
| 593 | struct lttng_live_component *lttng_live, |
| 594 | struct lttng_live_stream_iterator *lttng_live_stream, |
| 595 | struct bt_notification **notification) |
| 596 | { |
| 597 | enum bt_ctf_lttng_live_iterator_status ret = |
| 598 | BT_CTF_LTTNG_LIVE_ITERATOR_STATUS_OK; |
| 599 | enum bt_ctf_notif_iter_status status; |
| 600 | struct lttng_live_session *session; |
| 601 | |
| 602 | bt_list_for_each_entry(session, <tng_live->sessions, node) { |
| 603 | struct lttng_live_trace *trace; |
| 604 | |
| 605 | if (session->new_streams_needed) { |
| 606 | return BT_CTF_LTTNG_LIVE_ITERATOR_STATUS_CONTINUE; |
| 607 | } |
| 608 | bt_list_for_each_entry(trace, &session->traces, node) { |
| 609 | if (trace->new_metadata_needed) { |
| 610 | return BT_CTF_LTTNG_LIVE_ITERATOR_STATUS_CONTINUE; |
| 611 | } |
| 612 | } |
| 613 | } |
| 614 | |
| 615 | if (lttng_live_stream->state != LTTNG_LIVE_STREAM_ACTIVE_DATA) { |
| 616 | return BT_CTF_LTTNG_LIVE_ITERATOR_STATUS_ERROR; |
| 617 | } |
| 618 | if (lttng_live_stream->packet_end_notif_queue) { |
| 619 | *notification = lttng_live_stream->packet_end_notif_queue; |
| 620 | lttng_live_stream->packet_end_notif_queue = NULL; |
| 621 | status = BT_CTF_NOTIF_ITER_STATUS_OK; |
| 622 | } else { |
| 623 | status = bt_ctf_notif_iter_get_next_notification( |
| 624 | lttng_live_stream->notif_iter, |
| 625 | lttng_live_stream->trace->cc_prio_map, |
| 626 | notification); |
| 627 | if (status == BT_CTF_NOTIF_ITER_STATUS_OK) { |
| 628 | /* |
| 629 | * Consider empty packets as inactivity. |
| 630 | */ |
| 631 | if (bt_notification_get_type(*notification) == BT_NOTIFICATION_TYPE_PACKET_END) { |
| 632 | lttng_live_stream->packet_end_notif_queue = *notification; |
| 633 | *notification = NULL; |
| 634 | return emit_inactivity_notification(lttng_live, |
| 635 | lttng_live_stream, notification, |
| 636 | lttng_live_stream->current_packet_end_timestamp); |
| 637 | } |
| 638 | } |
| 639 | } |
| 640 | switch (status) { |
| 641 | case BT_CTF_NOTIF_ITER_STATUS_EOF: |
| 642 | ret = BT_CTF_LTTNG_LIVE_ITERATOR_STATUS_END; |
| 643 | break; |
| 644 | case BT_CTF_NOTIF_ITER_STATUS_OK: |
| 645 | ret = BT_CTF_LTTNG_LIVE_ITERATOR_STATUS_OK; |
| 646 | break; |
| 647 | case BT_CTF_NOTIF_ITER_STATUS_AGAIN: |
| 648 | /* |
| 649 | * Continue immediately (end of packet). The next |
| 650 | * get_index may return AGAIN to delay the following |
| 651 | * attempt. |
| 652 | */ |
| 653 | ret = BT_CTF_LTTNG_LIVE_ITERATOR_STATUS_CONTINUE; |
| 654 | break; |
| 655 | case BT_CTF_NOTIF_ITER_STATUS_INVAL: |
| 656 | /* No argument provided by the user, so don't return INVAL. */ |
| 657 | case BT_CTF_NOTIF_ITER_STATUS_ERROR: |
| 658 | default: |
| 659 | ret = BT_CTF_LTTNG_LIVE_ITERATOR_STATUS_ERROR; |
| 660 | break; |
| 661 | } |
| 662 | return ret; |
| 663 | } |
| 664 | |
| 665 | /* |
| 666 | * helper function: |
| 667 | * handle_no_data_streams() |
| 668 | * retry: |
| 669 | * - for each ACTIVE_NO_DATA stream: |
| 670 | * - query relayd for stream data, or quiescence info. |
| 671 | * - if need metadata, get metadata, goto retry. |
| 672 | * - if new stream, get new stream as ACTIVE_NO_DATA, goto retry |
| 673 | * - if quiescent, move to QUIESCENT streams |
| 674 | * - if fetched data, move to ACTIVE_DATA streams |
| 675 | * (at this point each stream either has data, or is quiescent) |
| 676 | * |
| 677 | * |
| 678 | * iterator_next: |
| 679 | * handle_new_streams_and_metadata() |
| 680 | * - query relayd for known streams, add them as ACTIVE_NO_DATA |
| 681 | * - query relayd for metadata |
| 682 | * |
| 683 | * call handle_active_no_data_streams() |
| 684 | * |
| 685 | * handle_quiescent_streams() |
| 686 | * - if at least one stream is ACTIVE_DATA: |
| 687 | * - peek stream event with lowest timestamp -> next_ts |
| 688 | * - for each quiescent stream |
| 689 | * - if next_ts >= quiescent end |
| 690 | * - set state to ACTIVE_NO_DATA |
| 691 | * - else |
| 692 | * - for each quiescent stream |
| 693 | * - set state to ACTIVE_NO_DATA |
| 694 | * |
| 695 | * call handle_active_no_data_streams() |
| 696 | * |
| 697 | * handle_active_data_streams() |
| 698 | * - if at least one stream is ACTIVE_DATA: |
| 699 | * - get stream event with lowest timestamp from heap |
| 700 | * - make that stream event the current notification. |
| 701 | * - move this stream heap position to its next event |
| 702 | * - if we need to fetch data from relayd, move |
| 703 | * stream to ACTIVE_NO_DATA. |
| 704 | * - return OK |
| 705 | * - return AGAIN |
| 706 | * |
| 707 | * end criterion: ctrl-c on client. If relayd exits or the session |
| 708 | * closes on the relay daemon side, we keep on waiting for streams. |
| 709 | * Eventually handle --end timestamp (also an end criterion). |
| 710 | * |
| 711 | * When disconnected from relayd: try to re-connect endlessly. |
| 712 | */ |
| 713 | static |
| 714 | struct bt_notification_iterator_next_return lttng_live_iterator_next_stream( |
| 715 | struct bt_private_notification_iterator *iterator, |
| 716 | struct lttng_live_stream_iterator *stream_iter) |
| 717 | { |
| 718 | enum bt_ctf_lttng_live_iterator_status status; |
| 719 | struct bt_notification_iterator_next_return next_return; |
| 720 | struct lttng_live_component *lttng_live; |
| 721 | |
| 722 | lttng_live = stream_iter->trace->session->lttng_live; |
| 723 | retry: |
| 724 | print_stream_state(stream_iter); |
| 725 | next_return.notification = NULL; |
| 726 | status = lttng_live_iterator_next_handle_new_streams_and_metadata(lttng_live); |
| 727 | if (status != BT_CTF_LTTNG_LIVE_ITERATOR_STATUS_OK) { |
| 728 | goto end; |
| 729 | } |
| 730 | status = lttng_live_iterator_next_handle_one_no_data_stream( |
| 731 | lttng_live, stream_iter); |
| 732 | if (status != BT_CTF_LTTNG_LIVE_ITERATOR_STATUS_OK) { |
| 733 | goto end; |
| 734 | } |
| 735 | status = lttng_live_iterator_next_handle_one_quiescent_stream( |
| 736 | lttng_live, stream_iter, &next_return.notification); |
| 737 | if (status != BT_CTF_LTTNG_LIVE_ITERATOR_STATUS_OK) { |
| 738 | assert(next_return.notification == NULL); |
| 739 | goto end; |
| 740 | } |
| 741 | if (next_return.notification) { |
| 742 | goto end; |
| 743 | } |
| 744 | status = lttng_live_iterator_next_handle_one_active_data_stream(lttng_live, |
| 745 | stream_iter, &next_return.notification); |
| 746 | if (status != BT_CTF_LTTNG_LIVE_ITERATOR_STATUS_OK) { |
| 747 | assert(next_return.notification == NULL); |
| 748 | } |
| 749 | |
| 750 | end: |
| 751 | switch (status) { |
| 752 | case BT_CTF_LTTNG_LIVE_ITERATOR_STATUS_CONTINUE: |
| 753 | print_dbg("continue"); |
| 754 | goto retry; |
| 755 | case BT_CTF_LTTNG_LIVE_ITERATOR_STATUS_AGAIN: |
| 756 | next_return.status = BT_NOTIFICATION_ITERATOR_STATUS_AGAIN; |
| 757 | print_dbg("again"); |
| 758 | break; |
| 759 | case BT_CTF_LTTNG_LIVE_ITERATOR_STATUS_END: |
| 760 | next_return.status = BT_NOTIFICATION_ITERATOR_STATUS_END; |
| 761 | print_dbg("end"); |
| 762 | break; |
| 763 | case BT_CTF_LTTNG_LIVE_ITERATOR_STATUS_OK: |
| 764 | next_return.status = BT_NOTIFICATION_ITERATOR_STATUS_OK; |
| 765 | print_dbg("ok"); |
| 766 | break; |
| 767 | case BT_CTF_LTTNG_LIVE_ITERATOR_STATUS_INVAL: |
| 768 | next_return.status = BT_NOTIFICATION_ITERATOR_STATUS_INVALID; |
| 769 | break; |
| 770 | case BT_CTF_LTTNG_LIVE_ITERATOR_STATUS_NOMEM: |
| 771 | next_return.status = BT_NOTIFICATION_ITERATOR_STATUS_NOMEM; |
| 772 | break; |
| 773 | case BT_CTF_LTTNG_LIVE_ITERATOR_STATUS_UNSUPPORTED: |
| 774 | next_return.status = BT_NOTIFICATION_ITERATOR_STATUS_UNSUPPORTED; |
| 775 | break; |
| 776 | case BT_CTF_LTTNG_LIVE_ITERATOR_STATUS_ERROR: |
| 777 | default: /* fall-through */ |
| 778 | next_return.status = BT_NOTIFICATION_ITERATOR_STATUS_ERROR; |
| 779 | break; |
| 780 | } |
| 781 | return next_return; |
| 782 | } |
| 783 | |
| 784 | static |
| 785 | struct bt_notification_iterator_next_return lttng_live_iterator_next_no_stream( |
| 786 | struct bt_private_notification_iterator *iterator, |
| 787 | struct lttng_live_no_stream_iterator *no_stream_iter) |
| 788 | { |
| 789 | enum bt_ctf_lttng_live_iterator_status status; |
| 790 | struct bt_notification_iterator_next_return next_return; |
| 791 | struct lttng_live_component *lttng_live; |
| 792 | |
| 793 | lttng_live = no_stream_iter->lttng_live; |
| 794 | retry: |
| 795 | lttng_live_force_new_streams_and_metadata(lttng_live); |
| 796 | status = lttng_live_iterator_next_handle_new_streams_and_metadata(lttng_live); |
| 797 | if (status != BT_CTF_LTTNG_LIVE_ITERATOR_STATUS_OK) { |
| 798 | goto end; |
| 799 | } |
| 800 | if (no_stream_iter->port) { |
| 801 | status = BT_CTF_LTTNG_LIVE_ITERATOR_STATUS_AGAIN; |
| 802 | } else { |
| 803 | status = BT_CTF_LTTNG_LIVE_ITERATOR_STATUS_END; |
| 804 | } |
| 805 | end: |
| 806 | switch (status) { |
| 807 | case BT_CTF_LTTNG_LIVE_ITERATOR_STATUS_CONTINUE: |
| 808 | goto retry; |
| 809 | case BT_CTF_LTTNG_LIVE_ITERATOR_STATUS_AGAIN: |
| 810 | next_return.status = BT_NOTIFICATION_ITERATOR_STATUS_AGAIN; |
| 811 | break; |
| 812 | case BT_CTF_LTTNG_LIVE_ITERATOR_STATUS_END: |
| 813 | next_return.status = BT_NOTIFICATION_ITERATOR_STATUS_END; |
| 814 | break; |
| 815 | case BT_CTF_LTTNG_LIVE_ITERATOR_STATUS_OK: |
| 816 | next_return.status = BT_NOTIFICATION_ITERATOR_STATUS_OK; |
| 817 | break; |
| 818 | case BT_CTF_LTTNG_LIVE_ITERATOR_STATUS_INVAL: |
| 819 | next_return.status = BT_NOTIFICATION_ITERATOR_STATUS_INVALID; |
| 820 | break; |
| 821 | case BT_CTF_LTTNG_LIVE_ITERATOR_STATUS_NOMEM: |
| 822 | next_return.status = BT_NOTIFICATION_ITERATOR_STATUS_NOMEM; |
| 823 | break; |
| 824 | case BT_CTF_LTTNG_LIVE_ITERATOR_STATUS_UNSUPPORTED: |
| 825 | next_return.status = BT_NOTIFICATION_ITERATOR_STATUS_UNSUPPORTED; |
| 826 | break; |
| 827 | case BT_CTF_LTTNG_LIVE_ITERATOR_STATUS_ERROR: |
| 828 | default: /* fall-through */ |
| 829 | next_return.status = BT_NOTIFICATION_ITERATOR_STATUS_ERROR; |
| 830 | break; |
| 831 | } |
| 832 | return next_return; |
| 833 | } |
| 834 | |
| 835 | BT_HIDDEN |
| 836 | struct bt_notification_iterator_next_return lttng_live_iterator_next( |
| 837 | struct bt_private_notification_iterator *iterator) |
| 838 | { |
| 839 | struct lttng_live_stream_iterator_generic *s = |
| 840 | bt_private_notification_iterator_get_user_data(iterator); |
| 841 | struct bt_notification_iterator_next_return next_return; |
| 842 | |
| 843 | switch (s->type) { |
| 844 | case LIVE_STREAM_TYPE_NO_STREAM: |
| 845 | next_return = lttng_live_iterator_next_no_stream(iterator, |
| 846 | container_of(s, struct lttng_live_no_stream_iterator, p)); |
| 847 | break; |
| 848 | case LIVE_STREAM_TYPE_STREAM: |
| 849 | next_return = lttng_live_iterator_next_stream(iterator, |
| 850 | container_of(s, struct lttng_live_stream_iterator, p)); |
| 851 | break; |
| 852 | default: |
| 853 | next_return.status = BT_NOTIFICATION_ITERATOR_STATUS_ERROR; |
| 854 | break; |
| 855 | } |
| 856 | return next_return; |
| 857 | } |
| 858 | |
| 859 | BT_HIDDEN |
| 860 | enum bt_notification_iterator_status lttng_live_iterator_init( |
| 861 | struct bt_private_notification_iterator *it, |
| 862 | struct bt_private_port *port) |
| 863 | { |
| 864 | enum bt_notification_iterator_status ret = |
| 865 | BT_NOTIFICATION_ITERATOR_STATUS_OK; |
| 866 | struct lttng_live_stream_iterator_generic *s; |
| 867 | |
| 868 | assert(it); |
| 869 | |
| 870 | s = bt_private_port_get_user_data(port); |
| 871 | assert(s); |
| 872 | switch (s->type) { |
| 873 | case LIVE_STREAM_TYPE_NO_STREAM: |
| 874 | { |
| 875 | struct lttng_live_no_stream_iterator *no_stream_iter = |
| 876 | container_of(s, struct lttng_live_no_stream_iterator, p); |
| 877 | ret = bt_private_notification_iterator_set_user_data(it, no_stream_iter); |
| 878 | if (ret) { |
| 879 | goto error; |
| 880 | } |
| 881 | break; |
| 882 | } |
| 883 | case LIVE_STREAM_TYPE_STREAM: |
| 884 | { |
| 885 | struct lttng_live_stream_iterator *stream_iter = |
| 886 | container_of(s, struct lttng_live_stream_iterator, p); |
| 887 | ret = bt_private_notification_iterator_set_user_data(it, stream_iter); |
| 888 | if (ret) { |
| 889 | goto error; |
| 890 | } |
| 891 | break; |
| 892 | } |
| 893 | default: |
| 894 | ret = BT_NOTIFICATION_ITERATOR_STATUS_ERROR; |
| 895 | goto end; |
| 896 | } |
| 897 | |
| 898 | end: |
| 899 | return ret; |
| 900 | error: |
| 901 | if (bt_private_notification_iterator_set_user_data(it, NULL) |
| 902 | != BT_NOTIFICATION_ITERATOR_STATUS_OK) { |
| 903 | BT_LOGE("Error setting private data to NULL"); |
| 904 | } |
| 905 | goto end; |
| 906 | } |
| 907 | |
| 908 | static |
| 909 | struct bt_value *lttng_live_query_list_sessions(struct bt_component_class *comp_class, |
| 910 | struct bt_value *params) |
| 911 | { |
| 912 | struct bt_value *url_value = NULL; |
| 913 | struct bt_value *results = NULL; |
| 914 | const char *url; |
| 915 | struct bt_live_viewer_connection *viewer_connection = NULL; |
| 916 | |
| 917 | url_value = bt_value_map_get(params, "url"); |
| 918 | if (!url_value || bt_value_is_null(url_value) || !bt_value_is_string(url_value)) { |
| 919 | BT_LOGW("Mandatory \"url\" parameter missing"); |
| 920 | goto error; |
| 921 | } |
| 922 | |
| 923 | if (bt_value_string_get(url_value, &url) != BT_VALUE_STATUS_OK) { |
| 924 | BT_LOGW("\"url\" parameter is required to be a string value"); |
| 925 | goto error; |
| 926 | } |
| 927 | |
| 928 | viewer_connection = bt_live_viewer_connection_create(url, NULL); |
| 929 | if (!viewer_connection) { |
| 930 | goto error; |
| 931 | } |
| 932 | |
| 933 | results = bt_live_viewer_connection_list_sessions(viewer_connection); |
| 934 | goto end; |
| 935 | error: |
| 936 | BT_PUT(results); |
| 937 | end: |
| 938 | if (viewer_connection) { |
| 939 | bt_live_viewer_connection_destroy(viewer_connection); |
| 940 | } |
| 941 | BT_PUT(url_value); |
| 942 | return results; |
| 943 | } |
| 944 | |
| 945 | BT_HIDDEN |
| 946 | struct bt_value *lttng_live_query(struct bt_component_class *comp_class, |
| 947 | const char *object, struct bt_value *params) |
| 948 | { |
| 949 | if (strcmp(object, "sessions") == 0) { |
| 950 | return lttng_live_query_list_sessions(comp_class, |
| 951 | params); |
| 952 | } |
| 953 | BT_LOGW("Unknown query object `%s`", object); |
| 954 | return NULL; |
| 955 | } |
| 956 | |
| 957 | static |
| 958 | void lttng_live_component_destroy_data(struct lttng_live_component *lttng_live) |
| 959 | { |
| 960 | int ret; |
| 961 | struct lttng_live_session *session, *s; |
| 962 | |
| 963 | bt_list_for_each_entry_safe(session, s, <tng_live->sessions, node) { |
| 964 | lttng_live_destroy_session(session); |
| 965 | } |
| 966 | BT_PUT(lttng_live->viewer_connection); |
| 967 | if (lttng_live->url) { |
| 968 | g_string_free(lttng_live->url, TRUE); |
| 969 | } |
| 970 | if (lttng_live->no_stream_port) { |
| 971 | ret = bt_private_port_remove_from_component(lttng_live->no_stream_port); |
| 972 | assert(!ret); |
| 973 | BT_PUT(lttng_live->no_stream_port); |
| 974 | } |
| 975 | if (lttng_live->no_stream_iter) { |
| 976 | g_free(lttng_live->no_stream_iter); |
| 977 | } |
| 978 | g_free(lttng_live); |
| 979 | } |
| 980 | |
| 981 | BT_HIDDEN |
| 982 | void lttng_live_component_finalize(struct bt_private_component *component) |
| 983 | { |
| 984 | void *data = bt_private_component_get_user_data(component); |
| 985 | |
| 986 | if (!data) { |
| 987 | return; |
| 988 | } |
| 989 | lttng_live_component_destroy_data(data); |
| 990 | } |
| 991 | |
| 992 | static |
| 993 | struct lttng_live_component *lttng_live_component_create(struct bt_value *params, |
| 994 | struct bt_private_component *private_component, |
| 995 | struct bt_graph *graph) |
| 996 | { |
| 997 | struct lttng_live_component *lttng_live; |
| 998 | struct bt_value *value = NULL; |
| 999 | const char *url; |
| 1000 | enum bt_value_status ret; |
| 1001 | |
| 1002 | lttng_live = g_new0(struct lttng_live_component, 1); |
| 1003 | if (!lttng_live) { |
| 1004 | goto end; |
| 1005 | } |
| 1006 | /* TODO: make this an overridable parameter. */ |
| 1007 | lttng_live->max_query_size = MAX_QUERY_SIZE; |
| 1008 | BT_INIT_LIST_HEAD(<tng_live->sessions); |
| 1009 | value = bt_value_map_get(params, "url"); |
| 1010 | if (!value || bt_value_is_null(value) || !bt_value_is_string(value)) { |
| 1011 | BT_LOGW("Mandatory \"url\" parameter missing"); |
| 1012 | goto error; |
| 1013 | } |
| 1014 | ret = bt_value_string_get(value, &url); |
| 1015 | if (ret != BT_VALUE_STATUS_OK) { |
| 1016 | BT_LOGW("\"url\" parameter is required to be a string value"); |
| 1017 | goto error; |
| 1018 | } |
| 1019 | lttng_live->url = g_string_new(url); |
| 1020 | if (!lttng_live->url) { |
| 1021 | goto error; |
| 1022 | } |
| 1023 | lttng_live->viewer_connection = |
| 1024 | bt_live_viewer_connection_create(lttng_live->url->str, lttng_live); |
| 1025 | if (!lttng_live->viewer_connection) { |
| 1026 | goto error; |
| 1027 | } |
| 1028 | if (lttng_live_create_viewer_session(lttng_live)) { |
| 1029 | goto error; |
| 1030 | } |
| 1031 | lttng_live->private_component = private_component; |
| 1032 | lttng_live->graph = graph; |
| 1033 | |
| 1034 | goto end; |
| 1035 | |
| 1036 | error: |
| 1037 | lttng_live_component_destroy_data(lttng_live); |
| 1038 | lttng_live = NULL; |
| 1039 | end: |
| 1040 | return lttng_live; |
| 1041 | } |
| 1042 | |
| 1043 | BT_HIDDEN |
| 1044 | enum bt_component_status lttng_live_component_init( |
| 1045 | struct bt_private_component *private_component, |
| 1046 | struct bt_value *params, void *init_method_data) |
| 1047 | { |
| 1048 | struct lttng_live_component *lttng_live; |
| 1049 | enum bt_component_status ret = BT_COMPONENT_STATUS_OK; |
| 1050 | struct bt_component *component; |
| 1051 | struct bt_graph *graph; |
| 1052 | |
| 1053 | component = bt_component_from_private_component(private_component); |
| 1054 | graph = bt_component_get_graph(component); |
| 1055 | bt_put(graph); /* weak */ |
| 1056 | bt_put(component); |
| 1057 | |
| 1058 | /* Passes ownership of iter ref to lttng_live_component_create. */ |
| 1059 | lttng_live = lttng_live_component_create(params, private_component, |
| 1060 | graph); |
| 1061 | if (!lttng_live) { |
| 1062 | if (bt_graph_is_canceled(graph)) { |
| 1063 | ret = BT_COMPONENT_STATUS_AGAIN; |
| 1064 | } else { |
| 1065 | ret = BT_COMPONENT_STATUS_NOMEM; |
| 1066 | } |
| 1067 | goto end; |
| 1068 | } |
| 1069 | |
| 1070 | lttng_live->no_stream_iter = g_new0(struct lttng_live_no_stream_iterator, 1); |
| 1071 | lttng_live->no_stream_iter->p.type = LIVE_STREAM_TYPE_NO_STREAM; |
| 1072 | lttng_live->no_stream_iter->lttng_live = lttng_live; |
| 1073 | ret = bt_private_component_source_add_output_private_port( |
| 1074 | lttng_live->private_component, "no-stream", |
| 1075 | lttng_live->no_stream_iter, |
| 1076 | <tng_live->no_stream_port); |
| 1077 | if (ret != BT_COMPONENT_STATUS_OK) { |
| 1078 | goto end; |
| 1079 | } |
| 1080 | |
| 1081 | lttng_live->no_stream_iter->port = lttng_live->no_stream_port; |
| 1082 | |
| 1083 | ret = bt_private_component_set_user_data(private_component, lttng_live); |
| 1084 | if (ret != BT_COMPONENT_STATUS_OK) { |
| 1085 | goto error; |
| 1086 | } |
| 1087 | |
| 1088 | end: |
| 1089 | return ret; |
| 1090 | error: |
| 1091 | (void) bt_private_component_set_user_data(private_component, NULL); |
| 1092 | lttng_live_component_destroy_data(lttng_live); |
| 1093 | return ret; |
| 1094 | } |
| 1095 | |
| 1096 | BT_HIDDEN |
| 1097 | enum bt_component_status lttng_live_accept_port_connection( |
| 1098 | struct bt_private_component *private_component, |
| 1099 | struct bt_private_port *self_private_port, |
| 1100 | struct bt_port *other_port) |
| 1101 | { |
| 1102 | struct lttng_live_component *lttng_live = |
| 1103 | bt_private_component_get_user_data(private_component); |
| 1104 | struct bt_component *other_component; |
| 1105 | enum bt_component_status status = BT_COMPONENT_STATUS_OK; |
| 1106 | struct bt_port *self_port = bt_port_from_private_port(self_private_port); |
| 1107 | |
| 1108 | other_component = bt_port_get_component(other_port); |
| 1109 | bt_put(other_component); /* weak */ |
| 1110 | |
| 1111 | if (!lttng_live->downstream_component) { |
| 1112 | lttng_live->downstream_component = other_component; |
| 1113 | goto end; |
| 1114 | } |
| 1115 | |
| 1116 | /* |
| 1117 | * Compare prior component to ensure we are connected to the |
| 1118 | * same downstream component as prior ports. |
| 1119 | */ |
| 1120 | if (lttng_live->downstream_component != other_component) { |
| 1121 | BT_LOGW("Cannot connect ctf.lttng-live component port \"%s\" to component \"%s\": already connected to component \"%s\".", |
| 1122 | bt_port_get_name(self_port), |
| 1123 | bt_component_get_name(other_component), |
| 1124 | bt_component_get_name(lttng_live->downstream_component)); |
| 1125 | status = BT_COMPONENT_STATUS_REFUSE_PORT_CONNECTION; |
| 1126 | goto end; |
| 1127 | } |
| 1128 | end: |
| 1129 | bt_put(self_port); |
| 1130 | return status; |
| 1131 | } |