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