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ctf: save self_msg_iter in ctf_msg_iter when creating it
[babeltrace.git] / src / plugins / ctf / lttng-live / viewer-connection.c
1 /*
2 * Copyright 2019 - Francis Deslauriers <francis.deslauriers@efficios.com>
3 * Copyright 2016 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining a copy
6 * of this software and associated documentation files (the "Software"), to deal
7 * in the Software without restriction, including without limitation the rights
8 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
9 * copies of the Software, and to permit persons to whom the Software is
10 * furnished to do so, subject to the following conditions:
11 *
12 * The above copyright notice and this permission notice shall be included in
13 * all copies or substantial portions of the Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
21 * SOFTWARE.
22 */
23
24 #define BT_COMP_LOG_SELF_COMP (viewer_connection->self_comp)
25 #define BT_LOG_OUTPUT_LEVEL (viewer_connection->log_level)
26 #define BT_LOG_TAG "PLUGIN/SRC.CTF.LTTNG-LIVE/VIEWER"
27 #include "logging/comp-logging.h"
28
29 #include <fcntl.h>
30 #include <stdbool.h>
31 #include <stdint.h>
32 #include <stdio.h>
33 #include <stdlib.h>
34 #include <sys/types.h>
35 #include <unistd.h>
36
37 #include <glib.h>
38
39 #include "compat/socket.h"
40 #include "compat/endian.h"
41 #include "compat/compiler.h"
42 #include "common/common.h"
43 #include <babeltrace2/babeltrace.h>
44
45 #include "lttng-live.h"
46 #include "viewer-connection.h"
47 #include "lttng-viewer-abi.h"
48 #include "data-stream.h"
49 #include "metadata.h"
50
51 static
52 ssize_t lttng_live_recv(struct live_viewer_connection *viewer_connection,
53 void *buf, size_t len)
54 {
55 ssize_t ret;
56 size_t copied = 0, to_copy = len;
57 struct lttng_live_msg_iter *lttng_live_msg_iter =
58 viewer_connection->lttng_live_msg_iter;
59 BT_SOCKET sock = viewer_connection->control_sock;
60
61 do {
62 ret = bt_socket_recv(sock, buf + copied, to_copy, 0);
63 if (ret > 0) {
64 BT_ASSERT(ret <= to_copy);
65 copied += ret;
66 to_copy -= ret;
67 }
68 if (ret == BT_SOCKET_ERROR && bt_socket_interrupted()) {
69 if (!viewer_connection->in_query &&
70 lttng_live_graph_is_canceled(lttng_live_msg_iter)) {
71 break;
72 } else {
73 continue;
74 }
75 }
76 } while (ret > 0 && to_copy > 0);
77
78 if (ret > 0) {
79 ret = copied;
80 }
81
82 /* ret = 0 means orderly shutdown, ret == BT_SOCKET_ERROR is error. */
83 return ret;
84 }
85
86 static
87 ssize_t lttng_live_send(struct live_viewer_connection *viewer_connection,
88 const void *buf, size_t len)
89 {
90 struct lttng_live_msg_iter *lttng_live_msg_iter =
91 viewer_connection->lttng_live_msg_iter;
92 BT_SOCKET sock = viewer_connection->control_sock;
93 ssize_t ret;
94
95 for (;;) {
96 ret = bt_socket_send_nosigpipe(sock, buf, len);
97 if (ret == BT_SOCKET_ERROR && bt_socket_interrupted()) {
98 if (!viewer_connection->in_query &&
99 lttng_live_graph_is_canceled(lttng_live_msg_iter)) {
100 break;
101 } else {
102 continue;
103 }
104 } else {
105 break;
106 }
107 }
108 return ret;
109 }
110
111 static
112 int parse_url(struct live_viewer_connection *viewer_connection)
113 {
114 char error_buf[256] = { 0 };
115 bt_self_component *self_comp = viewer_connection->self_comp;
116 bt_self_component_class *self_comp_class = viewer_connection->self_comp_class;
117 struct bt_common_lttng_live_url_parts lttng_live_url_parts = { 0 };
118 int ret = -1;
119 const char *path = viewer_connection->url->str;
120
121 if (!path) {
122 goto end;
123 }
124
125 lttng_live_url_parts = bt_common_parse_lttng_live_url(path, error_buf,
126 sizeof(error_buf));
127 if (!lttng_live_url_parts.proto) {
128 BT_COMP_OR_COMP_CLASS_LOGE_APPEND_CAUSE(self_comp,
129 self_comp_class,"Invalid LTTng live URL format: %s",
130 error_buf);
131 goto end;
132 }
133
134 viewer_connection->relay_hostname = lttng_live_url_parts.hostname;
135 lttng_live_url_parts.hostname = NULL;
136
137 if (lttng_live_url_parts.port >= 0) {
138 viewer_connection->port = lttng_live_url_parts.port;
139 } else {
140 viewer_connection->port = LTTNG_DEFAULT_NETWORK_VIEWER_PORT;
141 }
142
143 viewer_connection->target_hostname = lttng_live_url_parts.target_hostname;
144 lttng_live_url_parts.target_hostname = NULL;
145
146 if (lttng_live_url_parts.session_name) {
147 viewer_connection->session_name = lttng_live_url_parts.session_name;
148 lttng_live_url_parts.session_name = NULL;
149 }
150
151 BT_COMP_LOGI("Connecting to hostname : %s, port : %d, "
152 "target hostname : %s, session name : %s, proto : %s",
153 viewer_connection->relay_hostname->str,
154 viewer_connection->port,
155 !viewer_connection->target_hostname ?
156 "<none>" : viewer_connection->target_hostname->str,
157 !viewer_connection->session_name ?
158 "<none>" : viewer_connection->session_name->str,
159 lttng_live_url_parts.proto->str);
160 ret = 0;
161
162 end:
163 bt_common_destroy_lttng_live_url_parts(&lttng_live_url_parts);
164 return ret;
165 }
166
167 static
168 int lttng_live_handshake(struct live_viewer_connection *viewer_connection)
169 {
170 struct lttng_viewer_cmd cmd;
171 struct lttng_viewer_connect connect;
172 bt_self_component_class *self_comp_class = viewer_connection->self_comp_class;
173 bt_self_component *self_comp = viewer_connection->self_comp;
174 const size_t cmd_buf_len = sizeof(cmd) + sizeof(connect);
175 char cmd_buf[cmd_buf_len];
176 int ret;
177 ssize_t ret_len;
178
179 cmd.cmd = htobe32(LTTNG_VIEWER_CONNECT);
180 cmd.data_size = htobe64((uint64_t) sizeof(connect));
181 cmd.cmd_version = htobe32(0);
182
183 connect.viewer_session_id = -1ULL; /* will be set on recv */
184 connect.major = htobe32(LTTNG_LIVE_MAJOR);
185 connect.minor = htobe32(LTTNG_LIVE_MINOR);
186 connect.type = htobe32(LTTNG_VIEWER_CLIENT_COMMAND);
187
188 /*
189 * Merge the cmd and connection request to prevent a write-write
190 * sequence on the TCP socket. Otherwise, a delayed ACK will prevent the
191 * second write to be performed quickly in presence of Nagle's algorithm
192 */
193 memcpy(cmd_buf, &cmd, sizeof(cmd));
194 memcpy(cmd_buf + sizeof(cmd), &connect, sizeof(connect));
195 ret_len = lttng_live_send(viewer_connection, &cmd_buf, cmd_buf_len);
196 if (ret_len == BT_SOCKET_ERROR) {
197 BT_COMP_OR_COMP_CLASS_LOGE_APPEND_CAUSE(self_comp,
198 self_comp_class, "Error sending version: %s",
199 bt_socket_errormsg());
200 goto error;
201 }
202
203 BT_ASSERT(ret_len == cmd_buf_len);
204
205 ret_len = lttng_live_recv(viewer_connection, &connect, sizeof(connect));
206 if (ret_len == 0) {
207 BT_COMP_OR_COMP_CLASS_LOGE_APPEND_CAUSE(self_comp,
208 self_comp_class, "Remote side has closed connection");
209 goto error;
210 }
211 if (ret_len == BT_SOCKET_ERROR) {
212 BT_COMP_OR_COMP_CLASS_LOGE_APPEND_CAUSE(self_comp,
213 self_comp_class, "Error receiving version: %s",
214 bt_socket_errormsg());
215 goto error;
216 }
217 BT_ASSERT(ret_len == sizeof(connect));
218
219 BT_COMP_LOGI("Received viewer session ID : %" PRIu64,
220 (uint64_t) be64toh(connect.viewer_session_id));
221 BT_COMP_LOGI("Relayd version : %u.%u", be32toh(connect.major),
222 be32toh(connect.minor));
223
224 if (LTTNG_LIVE_MAJOR != be32toh(connect.major)) {
225 BT_COMP_OR_COMP_CLASS_LOGE_APPEND_CAUSE(self_comp,
226 self_comp_class, "Incompatible lttng-relayd protocol");
227 goto error;
228 }
229 /* Use the smallest protocol version implemented. */
230 if (LTTNG_LIVE_MINOR > be32toh(connect.minor)) {
231 viewer_connection->minor = be32toh(connect.minor);
232 } else {
233 viewer_connection->minor = LTTNG_LIVE_MINOR;
234 }
235 viewer_connection->major = LTTNG_LIVE_MAJOR;
236 ret = 0;
237 return ret;
238
239 error:
240 return -1;
241 }
242
243 static
244 int lttng_live_connect_viewer(struct live_viewer_connection *viewer_connection)
245 {
246 struct hostent *host;
247 struct sockaddr_in server_addr;
248 bt_self_component_class *self_comp_class = viewer_connection->self_comp_class;
249 bt_self_component *self_comp = viewer_connection->self_comp;
250 int ret;
251
252 if (parse_url(viewer_connection)) {
253 BT_COMP_OR_COMP_CLASS_LOGE_APPEND_CAUSE(self_comp,
254 self_comp_class, "Failed to parse URL");
255 goto error;
256 }
257
258 host = gethostbyname(viewer_connection->relay_hostname->str);
259 if (!host) {
260 BT_COMP_OR_COMP_CLASS_LOGE_APPEND_CAUSE(self_comp,
261 self_comp_class, "Cannot lookup hostname: hostname=\"%s\"",
262 viewer_connection->relay_hostname->str);
263 goto error;
264 }
265
266 if ((viewer_connection->control_sock = socket(AF_INET, SOCK_STREAM, 0)) == BT_INVALID_SOCKET) {
267 BT_COMP_OR_COMP_CLASS_LOGE_APPEND_CAUSE(self_comp,
268 self_comp_class, "Socket creation failed: %s", bt_socket_errormsg());
269 goto error;
270 }
271
272 server_addr.sin_family = AF_INET;
273 server_addr.sin_port = htons(viewer_connection->port);
274 server_addr.sin_addr = *((struct in_addr *) host->h_addr);
275 memset(&(server_addr.sin_zero), 0, 8);
276
277 if (connect(viewer_connection->control_sock, (struct sockaddr *) &server_addr,
278 sizeof(struct sockaddr)) == BT_SOCKET_ERROR) {
279 BT_COMP_OR_COMP_CLASS_LOGE_APPEND_CAUSE(self_comp,
280 self_comp_class, "Connection failed: %s",
281 bt_socket_errormsg());
282 goto error;
283 }
284 if (lttng_live_handshake(viewer_connection)) {
285 BT_COMP_OR_COMP_CLASS_LOGE_APPEND_CAUSE(self_comp,
286 self_comp_class, "Viewer handshake failed");
287 goto error;
288 }
289
290 ret = 0;
291
292 return ret;
293
294 error:
295 if (viewer_connection->control_sock != BT_INVALID_SOCKET) {
296 if (bt_socket_close(viewer_connection->control_sock) == BT_SOCKET_ERROR) {
297 BT_COMP_OR_COMP_CLASS_LOGE(self_comp, self_comp_class,
298 "Error closing socket: %s", bt_socket_errormsg());
299 }
300 }
301 viewer_connection->control_sock = BT_INVALID_SOCKET;
302 return -1;
303 }
304
305 static
306 void lttng_live_disconnect_viewer(
307 struct live_viewer_connection *viewer_connection)
308 {
309 if (viewer_connection->control_sock == BT_INVALID_SOCKET) {
310 return;
311 }
312 if (bt_socket_close(viewer_connection->control_sock) == BT_SOCKET_ERROR) {
313 BT_COMP_LOGE("Error closing socket: %s",
314 bt_socket_errormsg());
315 viewer_connection->control_sock = BT_INVALID_SOCKET;
316 }
317 }
318
319 static
320 int list_update_session(bt_value *results,
321 const struct lttng_viewer_session *session,
322 bool *_found, struct live_viewer_connection *viewer_connection)
323 {
324 bt_self_component_class *self_comp_class = viewer_connection->self_comp_class;
325 bt_self_component *self_comp = viewer_connection->self_comp;
326 int ret = 0;
327 uint64_t i, len;
328 bt_value *map = NULL;
329 bt_value *hostname = NULL;
330 bt_value *session_name = NULL;
331 bt_value *btval = NULL;
332 bool found = false;
333
334 len = bt_value_array_get_length(results);
335 for (i = 0; i < len; i++) {
336 const char *hostname_str = NULL;
337 const char *session_name_str = NULL;
338
339 map = bt_value_array_borrow_element_by_index(results, i);
340 hostname = bt_value_map_borrow_entry_value(map, "target-hostname");
341 if (!hostname) {
342 BT_COMP_OR_COMP_CLASS_LOGE_APPEND_CAUSE(self_comp,
343 self_comp_class,
344 "Error borrowing \"target-hostname\" entry.");
345 ret = -1;
346 goto end;
347 }
348 session_name = bt_value_map_borrow_entry_value(map, "session-name");
349 if (!session_name) {
350 BT_COMP_OR_COMP_CLASS_LOGE_APPEND_CAUSE(self_comp,
351 self_comp_class,
352 "Error borrowing \"session-name\" entry.");
353 ret = -1;
354 goto end;
355 }
356 hostname_str = bt_value_string_get(hostname);
357 session_name_str = bt_value_string_get(session_name);
358
359 if (strcmp(session->hostname, hostname_str) == 0
360 && strcmp(session->session_name, session_name_str) == 0) {
361 int64_t val;
362 uint32_t streams = be32toh(session->streams);
363 uint32_t clients = be32toh(session->clients);
364
365 found = true;
366
367 btval = bt_value_map_borrow_entry_value(map, "stream-count");
368 if (!btval) {
369 BT_COMP_OR_COMP_CLASS_LOGE_APPEND_CAUSE(
370 self_comp, self_comp_class,
371 "Error borrowing \"stream-count\" entry.");
372 ret = -1;
373 goto end;
374 }
375 val = bt_value_integer_unsigned_get(btval);
376 /* sum */
377 val += streams;
378 bt_value_integer_unsigned_set(btval, val);
379
380 btval = bt_value_map_borrow_entry_value(map, "client-count");
381 if (!btval) {
382 BT_COMP_OR_COMP_CLASS_LOGE_APPEND_CAUSE(
383 self_comp, self_comp_class,
384 "Error borrowing \"client-count\" entry.");
385 ret = -1;
386 goto end;
387 }
388 val = bt_value_integer_unsigned_get(btval);
389 /* max */
390 val = bt_max_t(int64_t, clients, val);
391 bt_value_integer_unsigned_set(btval, val);
392 }
393
394 if (found) {
395 break;
396 }
397 }
398 end:
399 *_found = found;
400 return ret;
401 }
402
403 static
404 int list_append_session(bt_value *results,
405 GString *base_url,
406 const struct lttng_viewer_session *session,
407 struct live_viewer_connection *viewer_connection)
408 {
409 int ret = 0;
410 bt_self_component_class *self_comp_class = viewer_connection->self_comp_class;
411 bt_value_map_insert_entry_status insert_status;
412 bt_value_array_append_element_status append_status;
413 bt_value *map = NULL;
414 GString *url = NULL;
415 bool found = false;
416
417 /*
418 * If the session already exists, add the stream count to it,
419 * and do max of client counts.
420 */
421 ret = list_update_session(results, session, &found, viewer_connection);
422 if (ret || found) {
423 goto end;
424 }
425
426 map = bt_value_map_create();
427 if (!map) {
428 BT_COMP_CLASS_LOGE_APPEND_CAUSE(self_comp_class,
429 "Error creating map value.");
430 ret = -1;
431 goto end;
432 }
433
434 if (base_url->len < 1) {
435 BT_COMP_CLASS_LOGE_APPEND_CAUSE(self_comp_class,
436 "Error: base_url length smaller than 1.");
437 ret = -1;
438 goto end;
439 }
440 /*
441 * key = "url",
442 * value = <string>,
443 */
444 url = g_string_new(base_url->str);
445 g_string_append(url, "/host/");
446 g_string_append(url, session->hostname);
447 g_string_append_c(url, '/');
448 g_string_append(url, session->session_name);
449
450 insert_status = bt_value_map_insert_string_entry(map, "url", url->str);
451 if (insert_status != BT_VALUE_MAP_INSERT_ENTRY_STATUS_OK) {
452 BT_COMP_CLASS_LOGE_APPEND_CAUSE(self_comp_class,
453 "Error inserting \"url\" entry.");
454 ret = -1;
455 goto end;
456 }
457
458 /*
459 * key = "target-hostname",
460 * value = <string>,
461 */
462 insert_status = bt_value_map_insert_string_entry(map, "target-hostname",
463 session->hostname);
464 if (insert_status != BT_VALUE_MAP_INSERT_ENTRY_STATUS_OK) {
465 BT_COMP_CLASS_LOGE_APPEND_CAUSE(self_comp_class,
466 "Error inserting \"target-hostname\" entry.");
467 ret = -1;
468 goto end;
469 }
470
471 /*
472 * key = "session-name",
473 * value = <string>,
474 */
475 insert_status = bt_value_map_insert_string_entry(map, "session-name",
476 session->session_name);
477 if (insert_status != BT_VALUE_MAP_INSERT_ENTRY_STATUS_OK) {
478 BT_COMP_CLASS_LOGE_APPEND_CAUSE(self_comp_class,
479 "Error inserting \"session-name\" entry.");
480 ret = -1;
481 goto end;
482 }
483
484 /*
485 * key = "timer-us",
486 * value = <integer>,
487 */
488 {
489 uint32_t live_timer = be32toh(session->live_timer);
490
491 insert_status = bt_value_map_insert_unsigned_integer_entry(
492 map, "timer-us", live_timer);
493 if (insert_status != BT_VALUE_MAP_INSERT_ENTRY_STATUS_OK) {
494 BT_COMP_CLASS_LOGE_APPEND_CAUSE(self_comp_class,
495 "Error inserting \"timer-us\" entry.");
496 ret = -1;
497 goto end;
498 }
499 }
500
501 /*
502 * key = "stream-count",
503 * value = <integer>,
504 */
505 {
506 uint32_t streams = be32toh(session->streams);
507
508 insert_status = bt_value_map_insert_unsigned_integer_entry(map,
509 "stream-count", streams);
510 if (insert_status != BT_VALUE_MAP_INSERT_ENTRY_STATUS_OK) {
511 BT_COMP_CLASS_LOGE_APPEND_CAUSE(self_comp_class,
512 "Error inserting \"stream-count\" entry.");
513 ret = -1;
514 goto end;
515 }
516 }
517
518 /*
519 * key = "client-count",
520 * value = <integer>,
521 */
522 {
523 uint32_t clients = be32toh(session->clients);
524
525 insert_status = bt_value_map_insert_unsigned_integer_entry(map,
526 "client-count", clients);
527 if (insert_status != BT_VALUE_MAP_INSERT_ENTRY_STATUS_OK) {
528 BT_COMP_CLASS_LOGE_APPEND_CAUSE(self_comp_class,
529 "Error inserting \"client-count\" entry.");
530 ret = -1;
531 goto end;
532 }
533 }
534
535 append_status = bt_value_array_append_element(results, map);
536 if (append_status != BT_VALUE_ARRAY_APPEND_ELEMENT_STATUS_OK) {
537 BT_COMP_CLASS_LOGE_APPEND_CAUSE(self_comp_class,
538 "Error appending map to results.");
539 ret = -1;
540 }
541
542 end:
543 if (url) {
544 g_string_free(url, true);
545 }
546 BT_VALUE_PUT_REF_AND_RESET(map);
547 return ret;
548 }
549
550 /*
551 * Data structure returned:
552 *
553 * {
554 * <array> = {
555 * [n] = {
556 * <map> = {
557 * {
558 * key = "url",
559 * value = <string>,
560 * },
561 * {
562 * key = "target-hostname",
563 * value = <string>,
564 * },
565 * {
566 * key = "session-name",
567 * value = <string>,
568 * },
569 * {
570 * key = "timer-us",
571 * value = <integer>,
572 * },
573 * {
574 * key = "stream-count",
575 * value = <integer>,
576 * },
577 * {
578 * key = "client-count",
579 * value = <integer>,
580 * },
581 * },
582 * }
583 * }
584 */
585
586 BT_HIDDEN
587 bt_component_class_query_method_status live_viewer_connection_list_sessions(
588 struct live_viewer_connection *viewer_connection,
589 const bt_value **user_result)
590 {
591 bt_self_component_class *self_comp_class = viewer_connection->self_comp_class;
592 bt_component_class_query_method_status status =
593 BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_OK;
594 bt_value *result = NULL;
595 struct lttng_viewer_cmd cmd;
596 struct lttng_viewer_list_sessions list;
597 uint32_t i, sessions_count;
598 ssize_t ret_len;
599
600 result = bt_value_array_create();
601 if (!result) {
602 BT_COMP_CLASS_LOGE_APPEND_CAUSE(self_comp_class,
603 "Error creating array");
604 status = BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_MEMORY_ERROR;
605 goto error;
606 }
607
608 cmd.cmd = htobe32(LTTNG_VIEWER_LIST_SESSIONS);
609 cmd.data_size = htobe64((uint64_t) 0);
610 cmd.cmd_version = htobe32(0);
611
612 ret_len = lttng_live_send(viewer_connection, &cmd, sizeof(cmd));
613 if (ret_len == BT_SOCKET_ERROR) {
614 BT_COMP_CLASS_LOGE_APPEND_CAUSE(self_comp_class,
615 "Error sending cmd: %s", bt_socket_errormsg());
616 status = BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_ERROR;
617 goto error;
618 }
619 BT_ASSERT(ret_len == sizeof(cmd));
620
621 ret_len = lttng_live_recv(viewer_connection, &list, sizeof(list));
622 if (ret_len == 0) {
623 BT_COMP_CLASS_LOGE_APPEND_CAUSE(self_comp_class,
624 "Remote side has closed connection");
625 status = BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_ERROR;
626 goto error;
627 }
628 if (ret_len == BT_SOCKET_ERROR) {
629 BT_COMP_CLASS_LOGE_APPEND_CAUSE(self_comp_class,
630 "Error receiving session list: %s",
631 bt_socket_errormsg());
632 status = BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_ERROR;
633 goto error;
634 }
635 BT_ASSERT(ret_len == sizeof(list));
636
637 sessions_count = be32toh(list.sessions_count);
638 for (i = 0; i < sessions_count; i++) {
639 struct lttng_viewer_session lsession;
640
641 ret_len = lttng_live_recv(viewer_connection, &lsession,
642 sizeof(lsession));
643 if (ret_len == 0) {
644 BT_COMP_CLASS_LOGE_APPEND_CAUSE(self_comp_class,
645 "Remote side has closed connection");
646 status = BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_ERROR;
647 goto error;
648 }
649 if (ret_len == BT_SOCKET_ERROR) {
650 BT_COMP_CLASS_LOGE_APPEND_CAUSE(self_comp_class,
651 "Error receiving session: %s",
652 bt_socket_errormsg());
653 status = BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_ERROR;
654 goto error;
655 }
656 BT_ASSERT(ret_len == sizeof(lsession));
657 lsession.hostname[LTTNG_VIEWER_HOST_NAME_MAX - 1] = '\0';
658 lsession.session_name[LTTNG_VIEWER_NAME_MAX - 1] = '\0';
659 if (list_append_session(result, viewer_connection->url,
660 &lsession, viewer_connection)) {
661 BT_COMP_CLASS_LOGE_APPEND_CAUSE(self_comp_class,
662 "Error appending session");
663 status = BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_ERROR;
664 goto error;
665 }
666 }
667
668 *user_result = result;
669 goto end;
670 error:
671 BT_VALUE_PUT_REF_AND_RESET(result);
672 end:
673 return status;
674 }
675
676 static
677 int lttng_live_query_session_ids(struct lttng_live_msg_iter *lttng_live_msg_iter)
678 {
679 struct lttng_viewer_cmd cmd;
680 struct lttng_viewer_list_sessions list;
681 struct lttng_viewer_session lsession;
682 uint32_t i, sessions_count;
683 ssize_t ret_len;
684 uint64_t session_id;
685 struct live_viewer_connection *viewer_connection =
686 lttng_live_msg_iter->viewer_connection;
687 bt_self_component *self_comp = viewer_connection->self_comp;
688
689 cmd.cmd = htobe32(LTTNG_VIEWER_LIST_SESSIONS);
690 cmd.data_size = htobe64((uint64_t) 0);
691 cmd.cmd_version = htobe32(0);
692
693 ret_len = lttng_live_send(viewer_connection, &cmd, sizeof(cmd));
694 if (ret_len == BT_SOCKET_ERROR) {
695 BT_COMP_LOGE_APPEND_CAUSE(self_comp, "Error sending cmd: %s",
696 bt_socket_errormsg());
697 goto error;
698 }
699 BT_ASSERT(ret_len == sizeof(cmd));
700
701 ret_len = lttng_live_recv(viewer_connection, &list, sizeof(list));
702 if (ret_len == 0) {
703 BT_COMP_LOGE_APPEND_CAUSE(self_comp,
704 "Remote side has closed connection");
705 goto error;
706 }
707 if (ret_len == BT_SOCKET_ERROR) {
708 BT_COMP_LOGE_APPEND_CAUSE(self_comp,
709 "Error receiving session list: %s",
710 bt_socket_errormsg());
711 goto error;
712 }
713 BT_ASSERT(ret_len == sizeof(list));
714
715 sessions_count = be32toh(list.sessions_count);
716 for (i = 0; i < sessions_count; i++) {
717 ret_len = lttng_live_recv(viewer_connection,
718 &lsession, sizeof(lsession));
719 if (ret_len == 0) {
720 BT_COMP_LOGE_APPEND_CAUSE(self_comp,
721 "Remote side has closed connection");
722 goto error;
723 }
724 if (ret_len == BT_SOCKET_ERROR) {
725 BT_COMP_LOGE_APPEND_CAUSE(self_comp,
726 "Error receiving session: %s",
727 bt_socket_errormsg());
728 goto error;
729 }
730 BT_ASSERT(ret_len == sizeof(lsession));
731 lsession.hostname[LTTNG_VIEWER_HOST_NAME_MAX - 1] = '\0';
732 lsession.session_name[LTTNG_VIEWER_NAME_MAX - 1] = '\0';
733 session_id = be64toh(lsession.id);
734
735 BT_COMP_LOGI("Adding session %" PRIu64 " hostname: %s session_name: %s",
736 session_id, lsession.hostname, lsession.session_name);
737
738 if ((strncmp(lsession.session_name,
739 viewer_connection->session_name->str,
740 LTTNG_VIEWER_NAME_MAX) == 0) && (strncmp(lsession.hostname,
741 viewer_connection->target_hostname->str,
742 LTTNG_VIEWER_HOST_NAME_MAX) == 0)) {
743 if (lttng_live_add_session(lttng_live_msg_iter, session_id,
744 lsession.hostname,
745 lsession.session_name)) {
746 BT_COMP_LOGE_APPEND_CAUSE(self_comp,
747 "Failed to add live session");
748 goto error;
749 }
750 }
751 }
752
753 return 0;
754
755 error:
756 return -1;
757 }
758
759 BT_HIDDEN
760 int lttng_live_create_viewer_session(
761 struct lttng_live_msg_iter *lttng_live_msg_iter)
762 {
763 struct lttng_viewer_cmd cmd;
764 struct lttng_viewer_create_session_response resp;
765 ssize_t ret_len;
766 struct live_viewer_connection *viewer_connection =
767 lttng_live_msg_iter->viewer_connection;
768 bt_self_component *self_comp = viewer_connection->self_comp;
769
770 cmd.cmd = htobe32(LTTNG_VIEWER_CREATE_SESSION);
771 cmd.data_size = htobe64((uint64_t) 0);
772 cmd.cmd_version = htobe32(0);
773
774 ret_len = lttng_live_send(viewer_connection, &cmd, sizeof(cmd));
775 if (ret_len == BT_SOCKET_ERROR) {
776 BT_COMP_LOGE_APPEND_CAUSE(self_comp, "Error sending cmd: %s",
777 bt_socket_errormsg());
778 goto error;
779 }
780 BT_ASSERT(ret_len == sizeof(cmd));
781
782 ret_len = lttng_live_recv(viewer_connection, &resp, sizeof(resp));
783 if (ret_len == 0) {
784 BT_COMP_LOGE_APPEND_CAUSE(self_comp,
785 "Remote side has closed connection");
786 goto error;
787 }
788 if (ret_len == BT_SOCKET_ERROR) {
789 BT_COMP_LOGE_APPEND_CAUSE(self_comp,
790 "Error receiving create session reply: %s",
791 bt_socket_errormsg());
792 goto error;
793 }
794 BT_ASSERT(ret_len == sizeof(resp));
795
796 if (be32toh(resp.status) != LTTNG_VIEWER_CREATE_SESSION_OK) {
797 BT_COMP_LOGE_APPEND_CAUSE(self_comp,
798 "Error creating viewer session");
799 goto error;
800 }
801 if (lttng_live_query_session_ids(lttng_live_msg_iter)) {
802 BT_COMP_LOGE_APPEND_CAUSE(self_comp,
803 "Failed to query live viewer session ids");
804 goto error;
805 }
806
807 return 0;
808
809 error:
810 return -1;
811 }
812
813 static
814 int receive_streams(struct lttng_live_session *session,
815 uint32_t stream_count,
816 bt_self_message_iterator *self_msg_iter)
817 {
818 ssize_t ret_len;
819 uint32_t i;
820 struct lttng_live_msg_iter *lttng_live_msg_iter =
821 session->lttng_live_msg_iter;
822 struct live_viewer_connection *viewer_connection =
823 lttng_live_msg_iter->viewer_connection;
824 bt_self_component *self_comp = viewer_connection->self_comp;
825
826 BT_COMP_LOGI("Getting %" PRIu32 " new streams:", stream_count);
827 for (i = 0; i < stream_count; i++) {
828 struct lttng_viewer_stream stream;
829 struct lttng_live_stream_iterator *live_stream;
830 uint64_t stream_id;
831 uint64_t ctf_trace_id;
832
833 ret_len = lttng_live_recv(viewer_connection, &stream, sizeof(stream));
834 if (ret_len == 0) {
835 BT_COMP_LOGE_APPEND_CAUSE(self_comp,
836 "Remote side has closed connection");
837 goto error;
838 }
839 if (ret_len == BT_SOCKET_ERROR) {
840 BT_COMP_LOGE_APPEND_CAUSE(self_comp,
841 "Error receiving stream");
842 goto error;
843 }
844 BT_ASSERT(ret_len == sizeof(stream));
845 stream.path_name[LTTNG_VIEWER_PATH_MAX - 1] = '\0';
846 stream.channel_name[LTTNG_VIEWER_NAME_MAX - 1] = '\0';
847 stream_id = be64toh(stream.id);
848 ctf_trace_id = be64toh(stream.ctf_trace_id);
849
850 if (stream.metadata_flag) {
851 BT_COMP_LOGI(" metadata stream %" PRIu64 " : %s/%s",
852 stream_id, stream.path_name, stream.channel_name);
853 if (lttng_live_metadata_create_stream(session,
854 ctf_trace_id, stream_id,
855 stream.path_name)) {
856 BT_COMP_LOGE_APPEND_CAUSE(self_comp,
857 "Error creating metadata stream");
858
859 goto error;
860 }
861 session->lazy_stream_msg_init = true;
862 } else {
863 BT_COMP_LOGI(" stream %" PRIu64 " : %s/%s",
864 stream_id, stream.path_name, stream.channel_name);
865 live_stream = lttng_live_stream_iterator_create(session,
866 ctf_trace_id, stream_id, self_msg_iter);
867 if (!live_stream) {
868 BT_COMP_LOGE_APPEND_CAUSE(self_comp,
869 "Error creating stream");
870 goto error;
871 }
872 }
873 }
874 return 0;
875
876 error:
877 return -1;
878 }
879
880 BT_HIDDEN
881 enum lttng_live_attach_session_status lttng_live_attach_session(
882 struct lttng_live_session *session,
883 bt_self_message_iterator *self_msg_iter)
884 {
885 struct lttng_viewer_cmd cmd;
886 enum lttng_live_attach_session_status attach_status;
887 struct lttng_viewer_attach_session_request rq;
888 struct lttng_viewer_attach_session_response rp;
889 struct lttng_live_msg_iter *lttng_live_msg_iter =
890 session->lttng_live_msg_iter;
891 struct live_viewer_connection *viewer_connection =
892 lttng_live_msg_iter->viewer_connection;
893 bt_self_component *self_comp = viewer_connection->self_comp;
894 uint64_t session_id = session->id;
895 uint32_t streams_count;
896 const size_t cmd_buf_len = sizeof(cmd) + sizeof(rq);
897 char cmd_buf[cmd_buf_len];
898 ssize_t ret_len;
899
900 cmd.cmd = htobe32(LTTNG_VIEWER_ATTACH_SESSION);
901 cmd.data_size = htobe64((uint64_t) sizeof(rq));
902 cmd.cmd_version = htobe32(0);
903
904 memset(&rq, 0, sizeof(rq));
905 rq.session_id = htobe64(session_id);
906 // TODO: add cmd line parameter to select seek beginning
907 // rq.seek = htobe32(LTTNG_VIEWER_SEEK_BEGINNING);
908 rq.seek = htobe32(LTTNG_VIEWER_SEEK_LAST);
909
910 /*
911 * Merge the cmd and connection request to prevent a write-write
912 * sequence on the TCP socket. Otherwise, a delayed ACK will prevent the
913 * second write to be performed quickly in presence of Nagle's algorithm.
914 */
915 memcpy(cmd_buf, &cmd, sizeof(cmd));
916 memcpy(cmd_buf + sizeof(cmd), &rq, sizeof(rq));
917 ret_len = lttng_live_send(viewer_connection, &cmd_buf, cmd_buf_len);
918 if (ret_len == BT_SOCKET_ERROR) {
919 BT_COMP_LOGE_APPEND_CAUSE(self_comp,
920 "Error sending attach request: %s",
921 bt_socket_errormsg());
922 goto error;
923 }
924
925 BT_ASSERT(ret_len == cmd_buf_len);
926 ret_len = lttng_live_recv(viewer_connection, &rp, sizeof(rp));
927 if (ret_len == 0) {
928 BT_COMP_LOGE_APPEND_CAUSE(self_comp,
929 "Remote side has closed connection");
930 goto error;
931 }
932 if (ret_len == BT_SOCKET_ERROR) {
933 BT_COMP_LOGE_APPEND_CAUSE(self_comp,
934 "Error receiving attach response: %s",
935 bt_socket_errormsg());
936 goto error;
937 }
938 BT_ASSERT(ret_len == sizeof(rp));
939
940 streams_count = be32toh(rp.streams_count);
941 switch(be32toh(rp.status)) {
942 case LTTNG_VIEWER_ATTACH_OK:
943 break;
944 case LTTNG_VIEWER_ATTACH_UNK:
945 BT_COMP_LOGE_APPEND_CAUSE(self_comp,
946 "Session id %" PRIu64 " is unknown", session_id);
947 goto error;
948 case LTTNG_VIEWER_ATTACH_ALREADY:
949 BT_COMP_LOGE_APPEND_CAUSE(self_comp,
950 "There is already a viewer attached to this session");
951 goto error;
952 case LTTNG_VIEWER_ATTACH_NOT_LIVE:
953 BT_COMP_LOGE_APPEND_CAUSE(self_comp, "Not a live session");
954 goto error;
955 case LTTNG_VIEWER_ATTACH_SEEK_ERR:
956 BT_COMP_LOGE_APPEND_CAUSE(self_comp, "Wrong seek parameter");
957 goto error;
958 default:
959 BT_COMP_LOGE_APPEND_CAUSE(self_comp,
960 "Unknown attach return code %u", be32toh(rp.status));
961 goto error;
962 }
963
964 /* We receive the initial list of streams. */
965 if (receive_streams(session, streams_count, self_msg_iter)) {
966 BT_COMP_LOGE_APPEND_CAUSE(self_comp, "Error receiving streams");
967 goto error;
968 }
969
970 session->attached = true;
971 session->new_streams_needed = false;
972
973 attach_status = LTTNG_LIVE_ATTACH_SESSION_STATUS_OK;
974 goto end;
975
976 error:
977 attach_status = LTTNG_LIVE_ATTACH_SESSION_STATUS_ERROR;
978
979 end:
980 return attach_status;
981 }
982
983 BT_HIDDEN
984 int lttng_live_detach_session(struct lttng_live_session *session)
985 {
986 struct lttng_viewer_cmd cmd;
987 struct lttng_viewer_detach_session_request rq;
988 struct lttng_viewer_detach_session_response rp;
989 ssize_t ret_len;
990 struct lttng_live_msg_iter *lttng_live_msg_iter =
991 session->lttng_live_msg_iter;
992 struct live_viewer_connection *viewer_connection =
993 lttng_live_msg_iter->viewer_connection;
994 uint64_t session_id = session->id;
995 const size_t cmd_buf_len = sizeof(cmd) + sizeof(rq);
996 char cmd_buf[cmd_buf_len];
997
998 if (!session->attached) {
999 return 0;
1000 }
1001
1002 cmd.cmd = htobe32(LTTNG_VIEWER_DETACH_SESSION);
1003 cmd.data_size = htobe64((uint64_t) sizeof(rq));
1004 cmd.cmd_version = htobe32(0);
1005
1006 memset(&rq, 0, sizeof(rq));
1007 rq.session_id = htobe64(session_id);
1008
1009 /*
1010 * Merge the cmd and connection request to prevent a write-write
1011 * sequence on the TCP socket. Otherwise, a delayed ACK will prevent the
1012 * second write to be performed quickly in presence of Nagle's algorithm.
1013 */
1014 memcpy(cmd_buf, &cmd, sizeof(cmd));
1015 memcpy(cmd_buf + sizeof(cmd), &rq, sizeof(rq));
1016 ret_len = lttng_live_send(viewer_connection, &cmd_buf, cmd_buf_len);
1017 if (ret_len == BT_SOCKET_ERROR) {
1018 BT_COMP_LOGE("Error sending detach request: %s",
1019 bt_socket_errormsg());
1020 goto error;
1021 }
1022
1023 BT_ASSERT(ret_len == cmd_buf_len);
1024 ret_len = lttng_live_recv(viewer_connection, &rp, sizeof(rp));
1025 if (ret_len == 0) {
1026 BT_COMP_LOGE("Remote side has closed connection");
1027 goto error;
1028 }
1029 if (ret_len == BT_SOCKET_ERROR) {
1030 BT_COMP_LOGE("Error receiving detach response: %s",
1031 bt_socket_errormsg());
1032 goto error;
1033 }
1034 BT_ASSERT(ret_len == sizeof(rp));
1035
1036 switch(be32toh(rp.status)) {
1037 case LTTNG_VIEWER_DETACH_SESSION_OK:
1038 break;
1039 case LTTNG_VIEWER_DETACH_SESSION_UNK:
1040 BT_COMP_LOGW("Session id %" PRIu64 " is unknown", session_id);
1041 goto error;
1042 case LTTNG_VIEWER_DETACH_SESSION_ERR:
1043 BT_COMP_LOGW("Error detaching session id %" PRIu64 "", session_id);
1044 goto error;
1045 default:
1046 BT_COMP_LOGE("Unknown detach return code %u", be32toh(rp.status));
1047 goto error;
1048 }
1049
1050 session->attached = false;
1051
1052 return 0;
1053
1054 error:
1055 return -1;
1056 }
1057
1058 BT_HIDDEN
1059 enum lttng_live_get_one_metadata_status lttng_live_get_one_metadata_packet(
1060 struct lttng_live_trace *trace, FILE *fp, size_t *reply_len)
1061 {
1062 uint64_t len = 0;
1063 enum lttng_live_get_one_metadata_status metadata_status;
1064 struct lttng_viewer_cmd cmd;
1065 struct lttng_viewer_get_metadata rq;
1066 struct lttng_viewer_metadata_packet rp;
1067 char *data = NULL;
1068 ssize_t ret_len;
1069 struct lttng_live_session *session = trace->session;
1070 struct lttng_live_msg_iter *lttng_live_msg_iter =
1071 session->lttng_live_msg_iter;
1072 struct lttng_live_metadata *metadata = trace->metadata;
1073 struct live_viewer_connection *viewer_connection =
1074 lttng_live_msg_iter->viewer_connection;
1075 bt_self_component *self_comp = viewer_connection->self_comp;
1076 const size_t cmd_buf_len = sizeof(cmd) + sizeof(rq);
1077 char cmd_buf[cmd_buf_len];
1078
1079 rq.stream_id = htobe64(metadata->stream_id);
1080 cmd.cmd = htobe32(LTTNG_VIEWER_GET_METADATA);
1081 cmd.data_size = htobe64((uint64_t) sizeof(rq));
1082 cmd.cmd_version = htobe32(0);
1083
1084 /*
1085 * Merge the cmd and connection request to prevent a write-write
1086 * sequence on the TCP socket. Otherwise, a delayed ACK will prevent the
1087 * second write to be performed quickly in presence of Nagle's algorithm.
1088 */
1089 memcpy(cmd_buf, &cmd, sizeof(cmd));
1090 memcpy(cmd_buf + sizeof(cmd), &rq, sizeof(rq));
1091 ret_len = lttng_live_send(viewer_connection, &cmd_buf, cmd_buf_len);
1092 if (ret_len == BT_SOCKET_ERROR) {
1093 BT_COMP_LOGE_APPEND_CAUSE(self_comp,
1094 "Error sending get_metadata request: %s",
1095 bt_socket_errormsg());
1096 goto error;
1097 }
1098
1099 BT_ASSERT(ret_len == cmd_buf_len);
1100 ret_len = lttng_live_recv(viewer_connection, &rp, sizeof(rp));
1101 if (ret_len == 0) {
1102 BT_COMP_LOGE_APPEND_CAUSE(self_comp,
1103 "Remote side has closed connection");
1104 goto error;
1105 }
1106 if (ret_len == BT_SOCKET_ERROR) {
1107 BT_COMP_LOGE_APPEND_CAUSE(self_comp,
1108 "Error receiving get_metadata response: %s",
1109 bt_socket_errormsg());
1110 goto error;
1111 }
1112 BT_ASSERT(ret_len == sizeof(rp));
1113
1114 switch (be32toh(rp.status)) {
1115 case LTTNG_VIEWER_METADATA_OK:
1116 BT_COMP_LOGD("Received get_metadata response: ok");
1117 break;
1118 case LTTNG_VIEWER_NO_NEW_METADATA:
1119 BT_COMP_LOGD("Received get_metadata response: no new");
1120 metadata_status = LTTNG_LIVE_GET_ONE_METADATA_STATUS_END;
1121 goto end;
1122 case LTTNG_VIEWER_METADATA_ERR:
1123 /*
1124 * The Relayd cannot find this stream id. Maybe its
1125 * gone already. This can happen in short lived UST app
1126 * in a per-pid session.
1127 */
1128 BT_COMP_LOGD("Received get_metadata response: error");
1129 metadata_status = LTTNG_LIVE_GET_ONE_METADATA_STATUS_CLOSED;
1130 goto end;
1131 default:
1132 BT_COMP_LOGE_APPEND_CAUSE(self_comp,
1133 "Received get_metadata response: unknown");
1134 goto error;
1135 }
1136
1137 len = be64toh(rp.len);
1138 BT_COMP_LOGD("Writing %" PRIu64" bytes to metadata", len);
1139 if (len <= 0) {
1140 BT_COMP_LOGE_APPEND_CAUSE(self_comp,
1141 "Erroneous response length");
1142 goto error;
1143 }
1144
1145 data = calloc(1, len);
1146 if (!data) {
1147 BT_COMP_LOGE_APPEND_CAUSE_ERRNO(self_comp,
1148 "Failed to allocate data buffer", ".");
1149 goto error;
1150 }
1151 ret_len = lttng_live_recv(viewer_connection, data, len);
1152 if (ret_len == 0) {
1153 BT_COMP_LOGI("Remote side has closed connection");
1154 goto error_free_data;
1155 }
1156 if (ret_len == BT_SOCKET_ERROR) {
1157 BT_COMP_LOGE_APPEND_CAUSE(self_comp,
1158 "Error receiving trace packet: %s", bt_socket_errormsg());
1159 goto error_free_data;
1160 }
1161 BT_ASSERT(ret_len == len);
1162
1163 do {
1164 ret_len = fwrite(data, 1, len, fp);
1165 } while (ret_len < 0 && errno == EINTR);
1166 if (ret_len < 0) {
1167 BT_COMP_LOGE_APPEND_CAUSE(self_comp,
1168 "Writing in the metadata file stream");
1169 goto error_free_data;
1170 }
1171 BT_ASSERT(ret_len == len);
1172 free(data);
1173 *reply_len = len;
1174 metadata_status = LTTNG_LIVE_GET_ONE_METADATA_STATUS_OK;
1175
1176 goto end;
1177
1178 error_free_data:
1179 free(data);
1180 error:
1181 metadata_status = LTTNG_LIVE_GET_ONE_METADATA_STATUS_ERROR;
1182
1183 end:
1184 return metadata_status;
1185 }
1186
1187 /*
1188 * Assign the fields from a lttng_viewer_index to a packet_index.
1189 */
1190 static
1191 void lttng_index_to_packet_index(struct lttng_viewer_index *lindex,
1192 struct packet_index *pindex)
1193 {
1194 BT_ASSERT(lindex);
1195 BT_ASSERT(pindex);
1196
1197 pindex->offset = be64toh(lindex->offset);
1198 pindex->packet_size = be64toh(lindex->packet_size);
1199 pindex->content_size = be64toh(lindex->content_size);
1200 pindex->ts_cycles.timestamp_begin = be64toh(lindex->timestamp_begin);
1201 pindex->ts_cycles.timestamp_end = be64toh(lindex->timestamp_end);
1202 pindex->events_discarded = be64toh(lindex->events_discarded);
1203 }
1204
1205 BT_HIDDEN
1206 enum lttng_live_iterator_status lttng_live_get_next_index(
1207 struct lttng_live_msg_iter *lttng_live_msg_iter,
1208 struct lttng_live_stream_iterator *stream,
1209 struct packet_index *index)
1210 {
1211 struct lttng_viewer_cmd cmd;
1212 struct lttng_viewer_get_next_index rq;
1213 struct lttng_viewer_index rp;
1214 enum lttng_live_iterator_status retstatus = LTTNG_LIVE_ITERATOR_STATUS_OK;
1215 struct live_viewer_connection *viewer_connection =
1216 lttng_live_msg_iter->viewer_connection;
1217 bt_self_component *self_comp = viewer_connection->self_comp;
1218 struct lttng_live_trace *trace = stream->trace;
1219 const size_t cmd_buf_len = sizeof(cmd) + sizeof(rq);
1220 char cmd_buf[cmd_buf_len];
1221 uint32_t flags, status;
1222 ssize_t ret_len;
1223
1224 cmd.cmd = htobe32(LTTNG_VIEWER_GET_NEXT_INDEX);
1225 cmd.data_size = htobe64((uint64_t) sizeof(rq));
1226 cmd.cmd_version = htobe32(0);
1227
1228
1229 memset(&rq, 0, sizeof(rq));
1230 rq.stream_id = htobe64(stream->viewer_stream_id);
1231
1232 /*
1233 * Merge the cmd and connection request to prevent a write-write
1234 * sequence on the TCP socket. Otherwise, a delayed ACK will prevent the
1235 * second write to be performed quickly in presence of Nagle's algorithm.
1236 */
1237 memcpy(cmd_buf, &cmd, sizeof(cmd));
1238 memcpy(cmd_buf + sizeof(cmd), &rq, sizeof(rq));
1239 ret_len = lttng_live_send(viewer_connection, &cmd_buf, cmd_buf_len);
1240 if (ret_len == BT_SOCKET_ERROR) {
1241 BT_COMP_LOGE_APPEND_CAUSE(self_comp,
1242 "Error sending get_next_index request: %s",
1243 bt_socket_errormsg());
1244 goto error;
1245 }
1246
1247 BT_ASSERT(ret_len == cmd_buf_len);
1248 ret_len = lttng_live_recv(viewer_connection, &rp, sizeof(rp));
1249 if (ret_len == 0) {
1250 BT_COMP_LOGE_APPEND_CAUSE(self_comp,
1251 "Remote side has closed connection");
1252 goto error;
1253 }
1254 if (ret_len == BT_SOCKET_ERROR) {
1255 BT_COMP_LOGE_APPEND_CAUSE(self_comp,
1256 "Error receiving get_next_index response: %s",
1257 bt_socket_errormsg());
1258 goto error;
1259 }
1260 BT_ASSERT(ret_len == sizeof(rp));
1261
1262 flags = be32toh(rp.flags);
1263 status = be32toh(rp.status);
1264
1265 switch (status) {
1266 case LTTNG_VIEWER_INDEX_INACTIVE:
1267 {
1268 uint64_t ctf_stream_class_id;
1269
1270 BT_COMP_LOGD("Received get_next_index response: inactive");
1271 memset(index, 0, sizeof(struct packet_index));
1272 index->ts_cycles.timestamp_end = be64toh(rp.timestamp_end);
1273 stream->current_inactivity_ts = index->ts_cycles.timestamp_end;
1274 ctf_stream_class_id = be64toh(rp.stream_id);
1275 if (stream->ctf_stream_class_id != -1ULL) {
1276 BT_ASSERT(stream->ctf_stream_class_id ==
1277 ctf_stream_class_id);
1278 } else {
1279 stream->ctf_stream_class_id = ctf_stream_class_id;
1280 }
1281 stream->state = LTTNG_LIVE_STREAM_QUIESCENT;
1282 break;
1283 }
1284 case LTTNG_VIEWER_INDEX_OK:
1285 {
1286 uint64_t ctf_stream_class_id;
1287
1288 BT_COMP_LOGD("Received get_next_index response: OK");
1289 lttng_index_to_packet_index(&rp, index);
1290 ctf_stream_class_id = be64toh(rp.stream_id);
1291 if (stream->ctf_stream_class_id != -1ULL) {
1292 BT_ASSERT(stream->ctf_stream_class_id ==
1293 ctf_stream_class_id);
1294 } else {
1295 stream->ctf_stream_class_id = ctf_stream_class_id;
1296 }
1297
1298 stream->state = LTTNG_LIVE_STREAM_ACTIVE_DATA;
1299
1300 if (flags & LTTNG_VIEWER_FLAG_NEW_METADATA) {
1301 BT_COMP_LOGD("Received get_next_index response: new metadata needed");
1302 trace->new_metadata_needed = true;
1303 }
1304 if (flags & LTTNG_VIEWER_FLAG_NEW_STREAM) {
1305 BT_COMP_LOGD("Received get_next_index response: new streams needed");
1306 lttng_live_need_new_streams(lttng_live_msg_iter);
1307 }
1308 break;
1309 }
1310 case LTTNG_VIEWER_INDEX_RETRY:
1311 BT_COMP_LOGD("Received get_next_index response: retry");
1312 memset(index, 0, sizeof(struct packet_index));
1313 retstatus = LTTNG_LIVE_ITERATOR_STATUS_AGAIN;
1314 stream->state = LTTNG_LIVE_STREAM_ACTIVE_NO_DATA;
1315 goto end;
1316 case LTTNG_VIEWER_INDEX_HUP:
1317 BT_COMP_LOGD("Received get_next_index response: stream hung up");
1318 memset(index, 0, sizeof(struct packet_index));
1319 index->offset = EOF;
1320 retstatus = LTTNG_LIVE_ITERATOR_STATUS_END;
1321 stream->state = LTTNG_LIVE_STREAM_EOF;
1322 stream->has_stream_hung_up = true;
1323 break;
1324 case LTTNG_VIEWER_INDEX_ERR:
1325 BT_COMP_LOGD("Received get_next_index response: error");
1326 memset(index, 0, sizeof(struct packet_index));
1327 stream->state = LTTNG_LIVE_STREAM_ACTIVE_NO_DATA;
1328 goto error;
1329 default:
1330 BT_COMP_LOGD("Received get_next_index response: unknown value");
1331 memset(index, 0, sizeof(struct packet_index));
1332 stream->state = LTTNG_LIVE_STREAM_ACTIVE_NO_DATA;
1333 goto error;
1334 }
1335 end:
1336 return retstatus;
1337
1338 error:
1339 if (lttng_live_graph_is_canceled(lttng_live_msg_iter)) {
1340 retstatus = LTTNG_LIVE_ITERATOR_STATUS_AGAIN;
1341 } else {
1342 retstatus = LTTNG_LIVE_ITERATOR_STATUS_ERROR;
1343 }
1344 return retstatus;
1345 }
1346
1347 BT_HIDDEN
1348 enum ctf_msg_iter_medium_status lttng_live_get_stream_bytes(
1349 struct lttng_live_msg_iter *lttng_live_msg_iter,
1350 struct lttng_live_stream_iterator *stream, uint8_t *buf,
1351 uint64_t offset, uint64_t req_len, uint64_t *recv_len)
1352 {
1353 enum ctf_msg_iter_medium_status retstatus = CTF_MSG_ITER_MEDIUM_STATUS_OK;
1354 struct lttng_viewer_trace_packet rp;
1355 struct lttng_viewer_cmd cmd;
1356 struct lttng_viewer_get_packet rq;
1357 struct live_viewer_connection *viewer_connection =
1358 lttng_live_msg_iter->viewer_connection;
1359 bt_self_component *self_comp = viewer_connection->self_comp;
1360 struct lttng_live_trace *trace = stream->trace;
1361 const size_t cmd_buf_len = sizeof(cmd) + sizeof(rq);
1362 char cmd_buf[cmd_buf_len];
1363 uint32_t flags, status;
1364 ssize_t ret_len;
1365
1366 BT_COMP_LOGD("lttng_live_get_stream_bytes: offset=%" PRIu64 ", req_len=%" PRIu64,
1367 offset, req_len);
1368 cmd.cmd = htobe32(LTTNG_VIEWER_GET_PACKET);
1369 cmd.data_size = htobe64((uint64_t) sizeof(rq));
1370 cmd.cmd_version = htobe32(0);
1371
1372 memset(&rq, 0, sizeof(rq));
1373 rq.stream_id = htobe64(stream->viewer_stream_id);
1374 rq.offset = htobe64(offset);
1375 rq.len = htobe32(req_len);
1376
1377 /*
1378 * Merge the cmd and connection request to prevent a write-write
1379 * sequence on the TCP socket. Otherwise, a delayed ACK will prevent the
1380 * second write to be performed quickly in presence of Nagle's algorithm.
1381 */
1382 memcpy(cmd_buf, &cmd, sizeof(cmd));
1383 memcpy(cmd_buf + sizeof(cmd), &rq, sizeof(rq));
1384 ret_len = lttng_live_send(viewer_connection, &cmd_buf, cmd_buf_len);
1385 if (ret_len == BT_SOCKET_ERROR) {
1386 BT_COMP_LOGE_APPEND_CAUSE(self_comp,
1387 "Error sending get_data_packet request: %s",
1388 bt_socket_errormsg());
1389 goto error;
1390 }
1391
1392 BT_ASSERT(ret_len == cmd_buf_len);
1393 ret_len = lttng_live_recv(viewer_connection, &rp, sizeof(rp));
1394 if (ret_len == 0) {
1395 BT_COMP_LOGE_APPEND_CAUSE(self_comp,
1396 "Remote side has closed connection");
1397 goto error;
1398 }
1399 if (ret_len == BT_SOCKET_ERROR) {
1400 BT_COMP_LOGE_APPEND_CAUSE(self_comp,
1401 "Socket error receiving get_data response: %s",
1402 bt_socket_errormsg());
1403 goto error;
1404 }
1405 if (ret_len != sizeof(rp)) {
1406 BT_COMP_LOGE_APPEND_CAUSE(self_comp, "get_data_packet: "
1407 "expected %zu, received %zd", sizeof(rp), ret_len);
1408 goto error;
1409 }
1410
1411 flags = be32toh(rp.flags);
1412 status = be32toh(rp.status);
1413
1414 switch (status) {
1415 case LTTNG_VIEWER_GET_PACKET_OK:
1416 req_len = be32toh(rp.len);
1417 BT_COMP_LOGD("Received get_data_packet response: Ok, "
1418 "packet size : %" PRIu64 "", req_len);
1419 break;
1420 case LTTNG_VIEWER_GET_PACKET_RETRY:
1421 /* Unimplemented by relay daemon */
1422 BT_COMP_LOGD("Received get_data_packet response: retry");
1423 retstatus = CTF_MSG_ITER_MEDIUM_STATUS_AGAIN;
1424 goto end;
1425 case LTTNG_VIEWER_GET_PACKET_ERR:
1426 if (flags & LTTNG_VIEWER_FLAG_NEW_METADATA) {
1427 BT_COMP_LOGD("get_data_packet: new metadata needed, try again later");
1428 trace->new_metadata_needed = true;
1429 }
1430 if (flags & LTTNG_VIEWER_FLAG_NEW_STREAM) {
1431 BT_COMP_LOGD("get_data_packet: new streams needed, try again later");
1432 lttng_live_need_new_streams(lttng_live_msg_iter);
1433 }
1434 if (flags & (LTTNG_VIEWER_FLAG_NEW_METADATA
1435 | LTTNG_VIEWER_FLAG_NEW_STREAM)) {
1436 retstatus = CTF_MSG_ITER_MEDIUM_STATUS_AGAIN;
1437 goto end;
1438 }
1439 BT_COMP_LOGE_APPEND_CAUSE(self_comp,
1440 "Received get_data_packet response: error");
1441 goto error;
1442 case LTTNG_VIEWER_GET_PACKET_EOF:
1443 retstatus = CTF_MSG_ITER_MEDIUM_STATUS_EOF;
1444 goto end;
1445 default:
1446 BT_COMP_LOGE_APPEND_CAUSE(self_comp,
1447 "Received get_data_packet response: unknown");
1448 goto error;
1449 }
1450
1451 if (req_len == 0) {
1452 goto error;
1453 }
1454
1455 ret_len = lttng_live_recv(viewer_connection, buf, req_len);
1456 if (ret_len == 0) {
1457 BT_COMP_LOGE_APPEND_CAUSE(self_comp,
1458 "Remote side has closed connection");
1459 goto error;
1460 }
1461 if (ret_len == BT_SOCKET_ERROR) {
1462 BT_COMP_LOGE_APPEND_CAUSE(self_comp,
1463 "Error receiving trace packet: %s",
1464 bt_socket_errormsg());
1465 goto error;
1466 }
1467 BT_ASSERT(ret_len == req_len);
1468 *recv_len = ret_len;
1469 end:
1470 return retstatus;
1471
1472 error:
1473 if (lttng_live_graph_is_canceled(lttng_live_msg_iter)) {
1474 retstatus = CTF_MSG_ITER_MEDIUM_STATUS_AGAIN;
1475 } else {
1476 retstatus = CTF_MSG_ITER_MEDIUM_STATUS_ERROR;
1477 }
1478 return retstatus;
1479 }
1480
1481 /*
1482 * Request new streams for a session.
1483 */
1484 BT_HIDDEN
1485 enum lttng_live_iterator_status lttng_live_get_new_streams(
1486 struct lttng_live_session *session,
1487 bt_self_message_iterator *self_msg_iter)
1488 {
1489 enum lttng_live_iterator_status status =
1490 LTTNG_LIVE_ITERATOR_STATUS_OK;
1491 struct lttng_viewer_cmd cmd;
1492 struct lttng_viewer_new_streams_request rq;
1493 struct lttng_viewer_new_streams_response rp;
1494 struct lttng_live_msg_iter *lttng_live_msg_iter =
1495 session->lttng_live_msg_iter;
1496 struct live_viewer_connection *viewer_connection =
1497 lttng_live_msg_iter->viewer_connection;
1498 bt_self_component *self_comp = viewer_connection->self_comp;
1499 uint32_t streams_count;
1500 const size_t cmd_buf_len = sizeof(cmd) + sizeof(rq);
1501 char cmd_buf[cmd_buf_len];
1502 ssize_t ret_len;
1503
1504 if (!session->new_streams_needed) {
1505 return LTTNG_LIVE_ITERATOR_STATUS_OK;
1506 }
1507
1508 cmd.cmd = htobe32(LTTNG_VIEWER_GET_NEW_STREAMS);
1509 cmd.data_size = htobe64((uint64_t) sizeof(rq));
1510 cmd.cmd_version = htobe32(0);
1511
1512 memset(&rq, 0, sizeof(rq));
1513 rq.session_id = htobe64(session->id);
1514
1515 /*
1516 * Merge the cmd and connection request to prevent a write-write
1517 * sequence on the TCP socket. Otherwise, a delayed ACK will prevent the
1518 * second write to be performed quickly in presence of Nagle's algorithm.
1519 */
1520 memcpy(cmd_buf, &cmd, sizeof(cmd));
1521 memcpy(cmd_buf + sizeof(cmd), &rq, sizeof(rq));
1522 ret_len = lttng_live_send(viewer_connection, &cmd_buf, cmd_buf_len);
1523 if (ret_len == BT_SOCKET_ERROR) {
1524 BT_COMP_LOGE_APPEND_CAUSE(self_comp,
1525 "Error sending get_new_streams request: %s",
1526 bt_socket_errormsg());
1527 goto error;
1528 }
1529
1530 BT_ASSERT(ret_len == cmd_buf_len);
1531 ret_len = lttng_live_recv(viewer_connection, &rp, sizeof(rp));
1532 if (ret_len == 0) {
1533 BT_COMP_LOGE_APPEND_CAUSE(self_comp,
1534 "Remote side has closed connection");
1535 goto error;
1536 }
1537 if (ret_len == BT_SOCKET_ERROR) {
1538 BT_COMP_LOGE_APPEND_CAUSE(self_comp,
1539 "Error receiving get_new_streams response");
1540 goto error;
1541 }
1542 BT_ASSERT(ret_len == sizeof(rp));
1543
1544 streams_count = be32toh(rp.streams_count);
1545
1546 switch(be32toh(rp.status)) {
1547 case LTTNG_VIEWER_NEW_STREAMS_OK:
1548 session->new_streams_needed = false;
1549 break;
1550 case LTTNG_VIEWER_NEW_STREAMS_NO_NEW:
1551 session->new_streams_needed = false;
1552 goto end;
1553 case LTTNG_VIEWER_NEW_STREAMS_HUP:
1554 session->new_streams_needed = false;
1555 session->closed = true;
1556 status = LTTNG_LIVE_ITERATOR_STATUS_END;
1557 goto end;
1558 case LTTNG_VIEWER_NEW_STREAMS_ERR:
1559 BT_COMP_LOGD("Received get_new_streams response: error");
1560 goto error;
1561 default:
1562 BT_COMP_LOGE_APPEND_CAUSE(self_comp,
1563 "Received get_new_streams response: Unknown:"
1564 "return code %u", be32toh(rp.status));
1565 goto error;
1566 }
1567
1568 if (receive_streams(session, streams_count, self_msg_iter)) {
1569 BT_COMP_LOGE_APPEND_CAUSE(self_comp, "Error receiving streams");
1570 goto error;
1571 }
1572 end:
1573 return status;
1574
1575 error:
1576 if (lttng_live_graph_is_canceled(lttng_live_msg_iter)) {
1577 status = LTTNG_LIVE_ITERATOR_STATUS_AGAIN;
1578 } else {
1579 status = LTTNG_LIVE_ITERATOR_STATUS_ERROR;
1580 BT_COMP_LOGE("Error receiving streams.");
1581 }
1582 return status;
1583 }
1584
1585 BT_HIDDEN
1586 struct live_viewer_connection *live_viewer_connection_create(
1587 const char *url, bool in_query,
1588 struct lttng_live_msg_iter *lttng_live_msg_iter,
1589 bt_self_component *self_comp,
1590 bt_self_component_class *self_comp_class,
1591 bt_logging_level log_level)
1592 {
1593 struct live_viewer_connection *viewer_connection;
1594
1595 viewer_connection = g_new0(struct live_viewer_connection, 1);
1596
1597 if (bt_socket_init(log_level) != 0) {
1598 BT_COMP_OR_COMP_CLASS_LOGE_APPEND_CAUSE(self_comp,
1599 self_comp_class, "Failed to init socket");
1600 goto error;
1601 }
1602
1603 viewer_connection->log_level = log_level;
1604
1605 viewer_connection->self_comp = self_comp;
1606 viewer_connection->self_comp_class = self_comp_class;
1607
1608 viewer_connection->control_sock = BT_INVALID_SOCKET;
1609 viewer_connection->port = -1;
1610 viewer_connection->in_query = in_query;
1611 viewer_connection->lttng_live_msg_iter = lttng_live_msg_iter;
1612 viewer_connection->url = g_string_new(url);
1613 if (!viewer_connection->url) {
1614 BT_COMP_OR_COMP_CLASS_LOGE_APPEND_CAUSE(self_comp,
1615 self_comp_class, "Failed to allocate URL buffer");
1616 goto error;
1617 }
1618
1619 BT_COMP_LOGI("Establishing connection to url \"%s\"...", url);
1620 if (lttng_live_connect_viewer(viewer_connection)) {
1621 BT_COMP_OR_COMP_CLASS_LOGE_APPEND_CAUSE(self_comp,
1622 self_comp_class, "Failed to establish connection: "
1623 "url=\"%s\"", url);
1624 goto error;
1625 }
1626 BT_COMP_LOGI("Connection to url \"%s\" is established", url);
1627 return viewer_connection;
1628
1629 error:
1630 if (viewer_connection) {
1631 live_viewer_connection_destroy(viewer_connection);
1632 }
1633
1634 return NULL;
1635 }
1636
1637 BT_HIDDEN
1638 void live_viewer_connection_destroy(
1639 struct live_viewer_connection *viewer_connection)
1640 {
1641 BT_COMP_LOGI("Closing connection to url \"%s\"", viewer_connection->url->str);
1642
1643 if (!viewer_connection) {
1644 goto end;
1645 }
1646
1647 lttng_live_disconnect_viewer(viewer_connection);
1648
1649 if (viewer_connection->url) {
1650 g_string_free(viewer_connection->url, true);
1651 }
1652
1653 if (viewer_connection->relay_hostname) {
1654 g_string_free(viewer_connection->relay_hostname, true);
1655 }
1656
1657 if (viewer_connection->target_hostname) {
1658 g_string_free(viewer_connection->target_hostname, true);
1659 }
1660
1661 if (viewer_connection->session_name) {
1662 g_string_free(viewer_connection->session_name, true);
1663 }
1664
1665 g_free(viewer_connection);
1666
1667 bt_socket_fini();
1668
1669 end:
1670 return;
1671 }
BabelTrace - Trace Format Babel Tower
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