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57271b2a5485bdd163377ed7334c24a22c2e3677
[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 "plugins/comp-logging.h"
28
29 #include <stdio.h>
30 #include <stdint.h>
31 #include <stdlib.h>
32 #include <stdbool.h>
33 #include <unistd.h>
34 #include <glib.h>
35 #include <inttypes.h>
36 #include <sys/types.h>
37 #include <fcntl.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->lttng_live_comp)) {
71 break;
72 } else {
73 continue;
74 }
75 }
76 } while (ret > 0 && to_copy > 0);
77 if (ret > 0)
78 ret = copied;
79 /* ret = 0 means orderly shutdown, ret == BT_SOCKET_ERROR is error. */
80 return ret;
81 }
82
83 static
84 ssize_t lttng_live_send(struct live_viewer_connection *viewer_connection,
85 const void *buf, size_t len)
86 {
87 struct lttng_live_msg_iter *lttng_live_msg_iter =
88 viewer_connection->lttng_live_msg_iter;
89 BT_SOCKET sock = viewer_connection->control_sock;
90 ssize_t ret;
91
92 for (;;) {
93 ret = bt_socket_send_nosigpipe(sock, buf, len);
94 if (ret == BT_SOCKET_ERROR && bt_socket_interrupted()) {
95 if (!viewer_connection->in_query &&
96 lttng_live_graph_is_canceled(lttng_live_msg_iter->lttng_live_comp)) {
97 break;
98 } else {
99 continue;
100 }
101 } else {
102 break;
103 }
104 }
105 return ret;
106 }
107
108 static
109 int parse_url(struct live_viewer_connection *viewer_connection)
110 {
111 char error_buf[256] = { 0 };
112 struct bt_common_lttng_live_url_parts lttng_live_url_parts = { 0 };
113 int ret = -1;
114 const char *path = viewer_connection->url->str;
115
116 if (!path) {
117 goto end;
118 }
119
120 lttng_live_url_parts = bt_common_parse_lttng_live_url(path,
121 error_buf, sizeof(error_buf));
122 if (!lttng_live_url_parts.proto) {
123 BT_COMP_LOGW("Invalid LTTng live URL format: %s", error_buf);
124 goto end;
125 }
126
127 viewer_connection->relay_hostname =
128 lttng_live_url_parts.hostname;
129 lttng_live_url_parts.hostname = NULL;
130
131 if (lttng_live_url_parts.port >= 0) {
132 viewer_connection->port = lttng_live_url_parts.port;
133 } else {
134 viewer_connection->port = LTTNG_DEFAULT_NETWORK_VIEWER_PORT;
135 }
136
137 viewer_connection->target_hostname =
138 lttng_live_url_parts.target_hostname;
139 lttng_live_url_parts.target_hostname = NULL;
140
141 if (lttng_live_url_parts.session_name) {
142 viewer_connection->session_name =
143 lttng_live_url_parts.session_name;
144 lttng_live_url_parts.session_name = NULL;
145 }
146
147 BT_COMP_LOGI("Connecting to hostname : %s, port : %d, "
148 "target hostname : %s, session name : %s, "
149 "proto : %s",
150 viewer_connection->relay_hostname->str,
151 viewer_connection->port,
152 viewer_connection->target_hostname == NULL ?
153 "<none>" : viewer_connection->target_hostname->str,
154 viewer_connection->session_name == NULL ?
155 "<none>" : viewer_connection->session_name->str,
156 lttng_live_url_parts.proto->str);
157 ret = 0;
158
159 end:
160 bt_common_destroy_lttng_live_url_parts(&lttng_live_url_parts);
161 return ret;
162 }
163
164 static
165 int lttng_live_handshake(struct live_viewer_connection *viewer_connection)
166 {
167 struct lttng_viewer_cmd cmd;
168 struct lttng_viewer_connect connect;
169 const size_t cmd_buf_len = sizeof(cmd) + sizeof(connect);
170 char cmd_buf[cmd_buf_len];
171 int ret;
172 ssize_t ret_len;
173
174 cmd.cmd = htobe32(LTTNG_VIEWER_CONNECT);
175 cmd.data_size = htobe64((uint64_t) sizeof(connect));
176 cmd.cmd_version = htobe32(0);
177
178 connect.viewer_session_id = -1ULL; /* will be set on recv */
179 connect.major = htobe32(LTTNG_LIVE_MAJOR);
180 connect.minor = htobe32(LTTNG_LIVE_MINOR);
181 connect.type = htobe32(LTTNG_VIEWER_CLIENT_COMMAND);
182
183 /*
184 * Merge the cmd and connection request to prevent a write-write
185 * sequence on the TCP socket. Otherwise, a delayed ACK will prevent the
186 * second write to be performed quickly in presence of Nagle's algorithm
187 */
188 memcpy(cmd_buf, &cmd, sizeof(cmd));
189 memcpy(cmd_buf + sizeof(cmd), &connect, sizeof(connect));
190 ret_len = lttng_live_send(viewer_connection, &cmd_buf, cmd_buf_len);
191 if (ret_len == BT_SOCKET_ERROR) {
192 BT_COMP_LOGE("Error sending version: %s", bt_socket_errormsg());
193 goto error;
194 }
195
196 BT_ASSERT(ret_len == cmd_buf_len);
197
198 ret_len = lttng_live_recv(viewer_connection, &connect, sizeof(connect));
199 if (ret_len == 0) {
200 BT_COMP_LOGI("Remote side has closed connection");
201 goto error;
202 }
203 if (ret_len == BT_SOCKET_ERROR) {
204 BT_COMP_LOGE("Error receiving version: %s", bt_socket_errormsg());
205 goto error;
206 }
207 BT_ASSERT(ret_len == sizeof(connect));
208
209 BT_COMP_LOGI("Received viewer session ID : %" PRIu64,
210 (uint64_t) be64toh(connect.viewer_session_id));
211 BT_COMP_LOGI("Relayd version : %u.%u", be32toh(connect.major),
212 be32toh(connect.minor));
213
214 if (LTTNG_LIVE_MAJOR != be32toh(connect.major)) {
215 BT_COMP_LOGE("Incompatible lttng-relayd protocol");
216 goto error;
217 }
218 /* Use the smallest protocol version implemented. */
219 if (LTTNG_LIVE_MINOR > be32toh(connect.minor)) {
220 viewer_connection->minor = be32toh(connect.minor);
221 } else {
222 viewer_connection->minor = LTTNG_LIVE_MINOR;
223 }
224 viewer_connection->major = LTTNG_LIVE_MAJOR;
225 ret = 0;
226 return ret;
227
228 error:
229 BT_COMP_LOGE("Unable to establish connection");
230 return -1;
231 }
232
233 static
234 int lttng_live_connect_viewer(struct live_viewer_connection *viewer_connection)
235 {
236 struct hostent *host;
237 struct sockaddr_in server_addr;
238 int ret;
239
240 if (parse_url(viewer_connection)) {
241 goto error;
242 }
243
244 host = gethostbyname(viewer_connection->relay_hostname->str);
245 if (!host) {
246 BT_COMP_LOGE("Cannot lookup hostname %s",
247 viewer_connection->relay_hostname->str);
248 goto error;
249 }
250
251 if ((viewer_connection->control_sock = socket(AF_INET, SOCK_STREAM, 0)) == BT_INVALID_SOCKET) {
252 BT_COMP_LOGE("Socket creation failed: %s", bt_socket_errormsg());
253 goto error;
254 }
255
256 server_addr.sin_family = AF_INET;
257 server_addr.sin_port = htons(viewer_connection->port);
258 server_addr.sin_addr = *((struct in_addr *) host->h_addr);
259 memset(&(server_addr.sin_zero), 0, 8);
260
261 if (connect(viewer_connection->control_sock, (struct sockaddr *) &server_addr,
262 sizeof(struct sockaddr)) == BT_SOCKET_ERROR) {
263 BT_COMP_LOGE("Connection failed: %s", bt_socket_errormsg());
264 goto error;
265 }
266 if (lttng_live_handshake(viewer_connection)) {
267 goto error;
268 }
269
270 ret = 0;
271
272 return ret;
273
274 error:
275 if (viewer_connection->control_sock != BT_INVALID_SOCKET) {
276 if (bt_socket_close(viewer_connection->control_sock) == BT_SOCKET_ERROR) {
277 BT_COMP_LOGE("Close: %s", bt_socket_errormsg());
278 }
279 }
280 viewer_connection->control_sock = BT_INVALID_SOCKET;
281 return -1;
282 }
283
284 static
285 void lttng_live_disconnect_viewer(
286 struct live_viewer_connection *viewer_connection)
287 {
288 if (viewer_connection->control_sock == BT_INVALID_SOCKET) {
289 return;
290 }
291 if (bt_socket_close(viewer_connection->control_sock) == BT_SOCKET_ERROR) {
292 BT_COMP_LOGE("Close: %s", bt_socket_errormsg());
293 viewer_connection->control_sock = BT_INVALID_SOCKET;
294 }
295 }
296
297 static
298 void connection_release(bt_object *obj)
299 {
300 struct live_viewer_connection *conn =
301 container_of(obj, struct live_viewer_connection, obj);
302
303 live_viewer_connection_destroy(conn);
304 }
305
306 static
307 int list_update_session(bt_value *results,
308 const struct lttng_viewer_session *session,
309 bool *_found, struct live_viewer_connection *viewer_connection)
310 {
311 int ret = 0;
312 bt_value *map = NULL;
313 bt_value *hostname = NULL;
314 bt_value *session_name = NULL;
315 bt_value *btval = NULL;
316 int i, len;
317 bool found = false;
318
319 len = bt_value_array_get_size(results);
320 if (len < 0) {
321 BT_COMP_LOGE_STR("Error getting size of array.");
322 ret = -1;
323 goto end;
324 }
325 for (i = 0; i < len; i++) {
326 const char *hostname_str = NULL;
327 const char *session_name_str = NULL;
328
329 map = bt_value_array_borrow_element_by_index(results, (size_t) i);
330 if (!map) {
331 BT_COMP_LOGE_STR("Error borrowing map.");
332 ret = -1;
333 goto end;
334 }
335 hostname = bt_value_map_borrow_entry_value(map, "target-hostname");
336 if (!hostname) {
337 BT_COMP_LOGE_STR("Error borrowing \"target-hostname\" entry.");
338 ret = -1;
339 goto end;
340 }
341 session_name = bt_value_map_borrow_entry_value(map, "session-name");
342 if (!session_name) {
343 BT_COMP_LOGE_STR("Error borrowing \"session-name\" entry.");
344 ret = -1;
345 goto end;
346 }
347 hostname_str = bt_value_string_get(hostname);
348 session_name_str = bt_value_string_get(session_name);
349
350 if (!strcmp(session->hostname, hostname_str)
351 && !strcmp(session->session_name,
352 session_name_str)) {
353 int64_t val;
354 uint32_t streams = be32toh(session->streams);
355 uint32_t clients = be32toh(session->clients);
356
357 found = true;
358
359 btval = bt_value_map_borrow_entry_value(map, "stream-count");
360 if (!btval) {
361 BT_COMP_LOGE_STR("Error borrowing \"stream-count\" entry.");
362 ret = -1;
363 goto end;
364 }
365 val = bt_value_signed_integer_get(btval);
366 /* sum */
367 val += streams;
368 bt_value_signed_integer_set(btval, val);
369
370 btval = bt_value_map_borrow_entry_value(map, "client-count");
371 if (!btval) {
372 BT_COMP_LOGE_STR("Error borrowing \"client-count\" entry.");
373 ret = -1;
374 goto end;
375 }
376 val = bt_value_signed_integer_get(btval);
377 /* max */
378 val = bt_max_t(int64_t, clients, val);
379 bt_value_signed_integer_set(btval, val);
380 }
381
382 if (found) {
383 break;
384 }
385 }
386 end:
387 *_found = found;
388 return ret;
389 }
390
391 static
392 int list_append_session(bt_value *results,
393 GString *base_url,
394 const struct lttng_viewer_session *session,
395 struct live_viewer_connection *viewer_connection)
396 {
397 int ret = 0;
398 bt_value_status ret_status;
399 bt_value *map = NULL;
400 GString *url = NULL;
401 bool found = false;
402
403 /*
404 * If the session already exists, add the stream count to it,
405 * and do max of client counts.
406 */
407 ret = list_update_session(results, session, &found, viewer_connection);
408 if (ret || found) {
409 goto end;
410 }
411
412 map = bt_value_map_create();
413 if (!map) {
414 BT_COMP_LOGE_STR("Error creating map value.");
415 ret = -1;
416 goto end;
417 }
418
419 if (base_url->len < 1) {
420 BT_COMP_LOGE_STR("Error: base_url length smaller than 1.");
421 ret = -1;
422 goto end;
423 }
424 /*
425 * key = "url",
426 * value = <string>,
427 */
428 url = g_string_new(base_url->str);
429 g_string_append(url, "/host/");
430 g_string_append(url, session->hostname);
431 g_string_append_c(url, '/');
432 g_string_append(url, session->session_name);
433
434 ret_status = bt_value_map_insert_string_entry(map, "url", url->str);
435 if (ret_status != BT_VALUE_STATUS_OK) {
436 BT_COMP_LOGE_STR("Error inserting \"url\" entry.");
437 ret = -1;
438 goto end;
439 }
440
441 /*
442 * key = "target-hostname",
443 * value = <string>,
444 */
445 ret_status = bt_value_map_insert_string_entry(map, "target-hostname",
446 session->hostname);
447 if (ret_status != BT_VALUE_STATUS_OK) {
448 BT_COMP_LOGE_STR("Error inserting \"target-hostname\" entry.");
449 ret = -1;
450 goto end;
451 }
452
453 /*
454 * key = "session-name",
455 * value = <string>,
456 */
457 ret_status = bt_value_map_insert_string_entry(map, "session-name",
458 session->session_name);
459 if (ret_status != BT_VALUE_STATUS_OK) {
460 BT_COMP_LOGE_STR("Error inserting \"session-name\" entry.");
461 ret = -1;
462 goto end;
463 }
464
465 /*
466 * key = "timer-us",
467 * value = <integer>,
468 */
469 {
470 uint32_t live_timer = be32toh(session->live_timer);
471
472 ret_status = bt_value_map_insert_signed_integer_entry(
473 map, "timer-us", live_timer);
474 if (ret_status != BT_VALUE_STATUS_OK) {
475 BT_COMP_LOGE_STR("Error inserting \"timer-us\" entry.");
476 ret = -1;
477 goto end;
478 }
479 }
480
481 /*
482 * key = "stream-count",
483 * value = <integer>,
484 */
485 {
486 uint32_t streams = be32toh(session->streams);
487
488 ret_status = bt_value_map_insert_signed_integer_entry(map,
489 "stream-count", streams);
490 if (ret_status != BT_VALUE_STATUS_OK) {
491 BT_COMP_LOGE_STR("Error inserting \"stream-count\" entry.");
492 ret = -1;
493 goto end;
494 }
495 }
496
497 /*
498 * key = "client-count",
499 * value = <integer>,
500 */
501 {
502 uint32_t clients = be32toh(session->clients);
503
504 ret_status = bt_value_map_insert_signed_integer_entry(map,
505 "client-count", clients);
506 if (ret_status != BT_VALUE_STATUS_OK) {
507 BT_COMP_LOGE_STR("Error inserting \"client-count\" entry.");
508 ret = -1;
509 goto end;
510 }
511 }
512
513 ret_status = bt_value_array_append_element(results, map);
514 if (ret_status != BT_VALUE_STATUS_OK) {
515 BT_COMP_LOGE_STR("Error appending map to results.");
516 ret = -1;
517 }
518
519 end:
520 if (url) {
521 g_string_free(url, true);
522 }
523 BT_VALUE_PUT_REF_AND_RESET(map);
524 return ret;
525 }
526
527 /*
528 * Data structure returned:
529 *
530 * {
531 * <array> = {
532 * [n] = {
533 * <map> = {
534 * {
535 * key = "url",
536 * value = <string>,
537 * },
538 * {
539 * key = "target-hostname",
540 * value = <string>,
541 * },
542 * {
543 * key = "session-name",
544 * value = <string>,
545 * },
546 * {
547 * key = "timer-us",
548 * value = <integer>,
549 * },
550 * {
551 * key = "stream-count",
552 * value = <integer>,
553 * },
554 * {
555 * key = "client-count",
556 * value = <integer>,
557 * },
558 * },
559 * }
560 * }
561 */
562
563 BT_HIDDEN
564 bt_query_status live_viewer_connection_list_sessions(
565 struct live_viewer_connection *viewer_connection,
566 const bt_value **user_result)
567 {
568 bt_query_status status = BT_QUERY_STATUS_OK;
569 bt_value *result = NULL;
570 struct lttng_viewer_cmd cmd;
571 struct lttng_viewer_list_sessions list;
572 uint32_t i, sessions_count;
573 ssize_t ret_len;
574
575 if (lttng_live_handshake(viewer_connection)) {
576 goto error;
577 }
578
579 result = bt_value_array_create();
580 if (!result) {
581 BT_COMP_LOGE("Error creating array");
582 status = BT_QUERY_STATUS_NOMEM;
583 goto error;
584 }
585
586 cmd.cmd = htobe32(LTTNG_VIEWER_LIST_SESSIONS);
587 cmd.data_size = htobe64((uint64_t) 0);
588 cmd.cmd_version = htobe32(0);
589
590 ret_len = lttng_live_send(viewer_connection, &cmd, sizeof(cmd));
591 if (ret_len == BT_SOCKET_ERROR) {
592 BT_COMP_LOGE("Error sending cmd: %s", bt_socket_errormsg());
593 status = BT_QUERY_STATUS_ERROR;
594 goto error;
595 }
596 BT_ASSERT(ret_len == sizeof(cmd));
597
598 ret_len = lttng_live_recv(viewer_connection, &list, sizeof(list));
599 if (ret_len == 0) {
600 BT_COMP_LOGI("Remote side has closed connection");
601 status = BT_QUERY_STATUS_ERROR;
602 goto error;
603 }
604 if (ret_len == BT_SOCKET_ERROR) {
605 BT_COMP_LOGE("Error receiving session list: %s", bt_socket_errormsg());
606 status = BT_QUERY_STATUS_ERROR;
607 goto error;
608 }
609 BT_ASSERT(ret_len == sizeof(list));
610
611 sessions_count = be32toh(list.sessions_count);
612 for (i = 0; i < sessions_count; i++) {
613 struct lttng_viewer_session lsession;
614
615 ret_len = lttng_live_recv(viewer_connection, &lsession,
616 sizeof(lsession));
617 if (ret_len == 0) {
618 BT_COMP_LOGI("Remote side has closed connection");
619 status = BT_QUERY_STATUS_ERROR;
620 goto error;
621 }
622 if (ret_len == BT_SOCKET_ERROR) {
623 BT_COMP_LOGE("Error receiving session: %s", bt_socket_errormsg());
624 status = BT_QUERY_STATUS_ERROR;
625 goto error;
626 }
627 BT_ASSERT(ret_len == sizeof(lsession));
628 lsession.hostname[LTTNG_VIEWER_HOST_NAME_MAX - 1] = '\0';
629 lsession.session_name[LTTNG_VIEWER_NAME_MAX - 1] = '\0';
630 if (list_append_session(result, viewer_connection->url,
631 &lsession, viewer_connection)) {
632 status = BT_QUERY_STATUS_ERROR;
633 goto error;
634 }
635 }
636
637 *user_result = result;
638 goto end;
639 error:
640 BT_VALUE_PUT_REF_AND_RESET(result);
641 end:
642 return status;
643 }
644
645 static
646 int lttng_live_query_session_ids(struct lttng_live_msg_iter *lttng_live_msg_iter)
647 {
648 struct lttng_viewer_cmd cmd;
649 struct lttng_viewer_list_sessions list;
650 struct lttng_viewer_session lsession;
651 uint32_t i, sessions_count;
652 ssize_t ret_len;
653 uint64_t session_id;
654 struct live_viewer_connection *viewer_connection =
655 lttng_live_msg_iter->viewer_connection;
656
657 cmd.cmd = htobe32(LTTNG_VIEWER_LIST_SESSIONS);
658 cmd.data_size = htobe64((uint64_t) 0);
659 cmd.cmd_version = htobe32(0);
660
661 ret_len = lttng_live_send(viewer_connection, &cmd, sizeof(cmd));
662 if (ret_len == BT_SOCKET_ERROR) {
663 BT_COMP_LOGE("Error sending cmd: %s", bt_socket_errormsg());
664 goto error;
665 }
666 BT_ASSERT(ret_len == sizeof(cmd));
667
668 ret_len = lttng_live_recv(viewer_connection, &list, sizeof(list));
669 if (ret_len == 0) {
670 BT_COMP_LOGI("Remote side has closed connection");
671 goto error;
672 }
673 if (ret_len == BT_SOCKET_ERROR) {
674 BT_COMP_LOGE("Error receiving session list: %s", bt_socket_errormsg());
675 goto error;
676 }
677 BT_ASSERT(ret_len == sizeof(list));
678
679 sessions_count = be32toh(list.sessions_count);
680 for (i = 0; i < sessions_count; i++) {
681 ret_len = lttng_live_recv(viewer_connection,
682 &lsession, sizeof(lsession));
683 if (ret_len == 0) {
684 BT_COMP_LOGI("Remote side has closed connection");
685 goto error;
686 }
687 if (ret_len == BT_SOCKET_ERROR) {
688 BT_COMP_LOGE("Error receiving session: %s", bt_socket_errormsg());
689 goto error;
690 }
691 BT_ASSERT(ret_len == sizeof(lsession));
692 lsession.hostname[LTTNG_VIEWER_HOST_NAME_MAX - 1] = '\0';
693 lsession.session_name[LTTNG_VIEWER_NAME_MAX - 1] = '\0';
694 session_id = be64toh(lsession.id);
695
696 BT_COMP_LOGI("Adding session %" PRIu64 " hostname: %s session_name: %s",
697 session_id, lsession.hostname, lsession.session_name);
698
699 if ((strncmp(lsession.session_name,
700 viewer_connection->session_name->str,
701 LTTNG_VIEWER_NAME_MAX) == 0) && (strncmp(lsession.hostname,
702 viewer_connection->target_hostname->str,
703 LTTNG_VIEWER_HOST_NAME_MAX) == 0)) {
704 if (lttng_live_add_session(lttng_live_msg_iter, session_id,
705 lsession.hostname,
706 lsession.session_name)) {
707 goto error;
708 }
709 }
710 }
711
712 return 0;
713
714 error:
715 BT_COMP_LOGE("Unable to query session ids");
716 return -1;
717 }
718
719 BT_HIDDEN
720 int lttng_live_create_viewer_session(
721 struct lttng_live_msg_iter *lttng_live_msg_iter)
722 {
723 struct lttng_viewer_cmd cmd;
724 struct lttng_viewer_create_session_response resp;
725 ssize_t ret_len;
726 struct live_viewer_connection *viewer_connection =
727 lttng_live_msg_iter->viewer_connection;
728
729 cmd.cmd = htobe32(LTTNG_VIEWER_CREATE_SESSION);
730 cmd.data_size = htobe64((uint64_t) 0);
731 cmd.cmd_version = htobe32(0);
732
733 ret_len = lttng_live_send(viewer_connection, &cmd, sizeof(cmd));
734 if (ret_len == BT_SOCKET_ERROR) {
735 BT_COMP_LOGE("Error sending cmd: %s", bt_socket_errormsg());
736 goto error;
737 }
738 BT_ASSERT(ret_len == sizeof(cmd));
739
740 ret_len = lttng_live_recv(viewer_connection, &resp, sizeof(resp));
741 if (ret_len == 0) {
742 BT_COMP_LOGI("Remote side has closed connection");
743 goto error;
744 }
745 if (ret_len == BT_SOCKET_ERROR) {
746 BT_COMP_LOGE("Error receiving create session reply: %s", bt_socket_errormsg());
747 goto error;
748 }
749 BT_ASSERT(ret_len == sizeof(resp));
750
751 if (be32toh(resp.status) != LTTNG_VIEWER_CREATE_SESSION_OK) {
752 BT_COMP_LOGE("Error creating viewer session");
753 goto error;
754 }
755 if (lttng_live_query_session_ids(lttng_live_msg_iter)) {
756 goto error;
757 }
758
759 return 0;
760
761 error:
762 return -1;
763 }
764
765 static
766 int receive_streams(struct lttng_live_session *session,
767 uint32_t stream_count)
768 {
769 ssize_t ret_len;
770 uint32_t i;
771 struct lttng_live_msg_iter *lttng_live_msg_iter =
772 session->lttng_live_msg_iter;
773 struct live_viewer_connection *viewer_connection =
774 lttng_live_msg_iter->viewer_connection;
775
776 BT_COMP_LOGI("Getting %" PRIu32 " new streams:", stream_count);
777 for (i = 0; i < stream_count; i++) {
778 struct lttng_viewer_stream stream;
779 struct lttng_live_stream_iterator *live_stream;
780 uint64_t stream_id;
781 uint64_t ctf_trace_id;
782
783 ret_len = lttng_live_recv(viewer_connection, &stream, sizeof(stream));
784 if (ret_len == 0) {
785 BT_COMP_LOGI("Remote side has closed connection");
786 goto error;
787 }
788 if (ret_len == BT_SOCKET_ERROR) {
789 BT_COMP_LOGE("Error receiving stream");
790 goto error;
791 }
792 BT_ASSERT(ret_len == sizeof(stream));
793 stream.path_name[LTTNG_VIEWER_PATH_MAX - 1] = '\0';
794 stream.channel_name[LTTNG_VIEWER_NAME_MAX - 1] = '\0';
795 stream_id = be64toh(stream.id);
796 ctf_trace_id = be64toh(stream.ctf_trace_id);
797
798 if (stream.metadata_flag) {
799 BT_COMP_LOGI(" metadata stream %" PRIu64 " : %s/%s",
800 stream_id, stream.path_name,
801 stream.channel_name);
802 if (lttng_live_metadata_create_stream(session,
803 ctf_trace_id, stream_id,
804 stream.path_name)) {
805 BT_COMP_LOGE("Error creating metadata stream");
806
807 goto error;
808 }
809 session->lazy_stream_msg_init = true;
810 } else {
811 BT_COMP_LOGI(" stream %" PRIu64 " : %s/%s",
812 stream_id, stream.path_name,
813 stream.channel_name);
814 live_stream = lttng_live_stream_iterator_create(session,
815 ctf_trace_id, stream_id);
816 if (!live_stream) {
817 BT_COMP_LOGE("Error creating streamn");
818 goto error;
819 }
820 }
821 }
822 return 0;
823
824 error:
825 return -1;
826 }
827
828 BT_HIDDEN
829 int lttng_live_attach_session(struct lttng_live_session *session)
830 {
831 struct lttng_viewer_cmd cmd;
832 struct lttng_viewer_attach_session_request rq;
833 struct lttng_viewer_attach_session_response rp;
834 ssize_t ret_len;
835 struct lttng_live_msg_iter *lttng_live_msg_iter = session->lttng_live_msg_iter;
836 struct live_viewer_connection *viewer_connection =
837 lttng_live_msg_iter->viewer_connection;
838 uint64_t session_id = session->id;
839 uint32_t streams_count;
840 const size_t cmd_buf_len = sizeof(cmd) + sizeof(rq);
841 char cmd_buf[cmd_buf_len];
842
843 cmd.cmd = htobe32(LTTNG_VIEWER_ATTACH_SESSION);
844 cmd.data_size = htobe64((uint64_t) sizeof(rq));
845 cmd.cmd_version = htobe32(0);
846
847 memset(&rq, 0, sizeof(rq));
848 rq.session_id = htobe64(session_id);
849 // TODO: add cmd line parameter to select seek beginning
850 // rq.seek = htobe32(LTTNG_VIEWER_SEEK_BEGINNING);
851 rq.seek = htobe32(LTTNG_VIEWER_SEEK_LAST);
852
853 /*
854 * Merge the cmd and connection request to prevent a write-write
855 * sequence on the TCP socket. Otherwise, a delayed ACK will prevent the
856 * second write to be performed quickly in presence of Nagle's algorithm.
857 */
858 memcpy(cmd_buf, &cmd, sizeof(cmd));
859 memcpy(cmd_buf + sizeof(cmd), &rq, sizeof(rq));
860 ret_len = lttng_live_send(viewer_connection, &cmd_buf, cmd_buf_len);
861 if (ret_len == BT_SOCKET_ERROR) {
862 BT_COMP_LOGE("Error sending attach request: %s", bt_socket_errormsg());
863 goto error;
864 }
865
866 BT_ASSERT(ret_len == cmd_buf_len);
867 ret_len = lttng_live_recv(viewer_connection, &rp, sizeof(rp));
868 if (ret_len == 0) {
869 BT_COMP_LOGI("Remote side has closed connection");
870 goto error;
871 }
872 if (ret_len == BT_SOCKET_ERROR) {
873 BT_COMP_LOGE("Error receiving attach response: %s", bt_socket_errormsg());
874 goto error;
875 }
876 BT_ASSERT(ret_len == sizeof(rp));
877
878 streams_count = be32toh(rp.streams_count);
879 switch(be32toh(rp.status)) {
880 case LTTNG_VIEWER_ATTACH_OK:
881 break;
882 case LTTNG_VIEWER_ATTACH_UNK:
883 BT_COMP_LOGW("Session id %" PRIu64 " is unknown", session_id);
884 goto error;
885 case LTTNG_VIEWER_ATTACH_ALREADY:
886 BT_COMP_LOGW("There is already a viewer attached to this session");
887 goto error;
888 case LTTNG_VIEWER_ATTACH_NOT_LIVE:
889 BT_COMP_LOGW("Not a live session");
890 goto error;
891 case LTTNG_VIEWER_ATTACH_SEEK_ERR:
892 BT_COMP_LOGE("Wrong seek parameter");
893 goto error;
894 default:
895 BT_COMP_LOGE("Unknown attach return code %u", be32toh(rp.status));
896 goto error;
897 }
898
899 /* We receive the initial list of streams. */
900 if (receive_streams(session, streams_count)) {
901 goto error;
902 }
903
904 session->attached = true;
905 session->new_streams_needed = false;
906
907 return 0;
908
909 error:
910 return -1;
911 }
912
913 BT_HIDDEN
914 int lttng_live_detach_session(struct lttng_live_session *session)
915 {
916 struct lttng_viewer_cmd cmd;
917 struct lttng_viewer_detach_session_request rq;
918 struct lttng_viewer_detach_session_response rp;
919 ssize_t ret_len;
920 struct lttng_live_msg_iter *lttng_live_msg_iter = session->lttng_live_msg_iter;
921 struct live_viewer_connection *viewer_connection =
922 lttng_live_msg_iter->viewer_connection;
923 uint64_t session_id = session->id;
924 const size_t cmd_buf_len = sizeof(cmd) + sizeof(rq);
925 char cmd_buf[cmd_buf_len];
926
927 if (!session->attached) {
928 return 0;
929 }
930
931 cmd.cmd = htobe32(LTTNG_VIEWER_DETACH_SESSION);
932 cmd.data_size = htobe64((uint64_t) sizeof(rq));
933 cmd.cmd_version = htobe32(0);
934
935 memset(&rq, 0, sizeof(rq));
936 rq.session_id = htobe64(session_id);
937
938 /*
939 * Merge the cmd and connection request to prevent a write-write
940 * sequence on the TCP socket. Otherwise, a delayed ACK will prevent the
941 * second write to be performed quickly in presence of Nagle's algorithm.
942 */
943 memcpy(cmd_buf, &cmd, sizeof(cmd));
944 memcpy(cmd_buf + sizeof(cmd), &rq, sizeof(rq));
945 ret_len = lttng_live_send(viewer_connection, &cmd_buf, cmd_buf_len);
946 if (ret_len == BT_SOCKET_ERROR) {
947 BT_COMP_LOGE("Error sending detach request: %s", bt_socket_errormsg());
948 goto error;
949 }
950
951 BT_ASSERT(ret_len == cmd_buf_len);
952 ret_len = lttng_live_recv(viewer_connection, &rp, sizeof(rp));
953 if (ret_len == 0) {
954 BT_COMP_LOGI("Remote side has closed connection");
955 goto error;
956 }
957 if (ret_len == BT_SOCKET_ERROR) {
958 BT_COMP_LOGE("Error receiving detach response: %s", bt_socket_errormsg());
959 goto error;
960 }
961 BT_ASSERT(ret_len == sizeof(rp));
962
963 switch(be32toh(rp.status)) {
964 case LTTNG_VIEWER_DETACH_SESSION_OK:
965 break;
966 case LTTNG_VIEWER_DETACH_SESSION_UNK:
967 BT_COMP_LOGW("Session id %" PRIu64 " is unknown", session_id);
968 goto error;
969 case LTTNG_VIEWER_DETACH_SESSION_ERR:
970 BT_COMP_LOGW("Error detaching session id %" PRIu64 "", session_id);
971 goto error;
972 default:
973 BT_COMP_LOGE("Unknown detach return code %u", be32toh(rp.status));
974 goto error;
975 }
976
977 session->attached = false;
978
979 return 0;
980
981 error:
982 return -1;
983 }
984
985 BT_HIDDEN
986 ssize_t lttng_live_get_one_metadata_packet(struct lttng_live_trace *trace,
987 FILE *fp)
988 {
989 uint64_t len = 0;
990 int ret;
991 struct lttng_viewer_cmd cmd;
992 struct lttng_viewer_get_metadata rq;
993 struct lttng_viewer_metadata_packet rp;
994 char *data = NULL;
995 ssize_t ret_len;
996 struct lttng_live_session *session = trace->session;
997 struct lttng_live_msg_iter *lttng_live_msg_iter = session->lttng_live_msg_iter;
998 struct lttng_live_metadata *metadata = trace->metadata;
999 struct live_viewer_connection *viewer_connection =
1000 lttng_live_msg_iter->viewer_connection;
1001 const size_t cmd_buf_len = sizeof(cmd) + sizeof(rq);
1002 char cmd_buf[cmd_buf_len];
1003
1004 rq.stream_id = htobe64(metadata->stream_id);
1005 cmd.cmd = htobe32(LTTNG_VIEWER_GET_METADATA);
1006 cmd.data_size = htobe64((uint64_t) sizeof(rq));
1007 cmd.cmd_version = htobe32(0);
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 get_metadata request: %s", bt_socket_errormsg());
1019 goto error;
1020 }
1021
1022 BT_ASSERT(ret_len == cmd_buf_len);
1023 ret_len = lttng_live_recv(viewer_connection, &rp, sizeof(rp));
1024 if (ret_len == 0) {
1025 BT_COMP_LOGI("Remote side has closed connection");
1026 goto error;
1027 }
1028 if (ret_len == BT_SOCKET_ERROR) {
1029 BT_COMP_LOGE("Error receiving get_metadata response: %s", bt_socket_errormsg());
1030 goto error;
1031 }
1032 BT_ASSERT(ret_len == sizeof(rp));
1033
1034 switch (be32toh(rp.status)) {
1035 case LTTNG_VIEWER_METADATA_OK:
1036 BT_COMP_LOGD("get_metadata : OK");
1037 break;
1038 case LTTNG_VIEWER_NO_NEW_METADATA:
1039 BT_COMP_LOGD("get_metadata : NO NEW");
1040 ret = 0;
1041 goto end;
1042 case LTTNG_VIEWER_METADATA_ERR:
1043 BT_COMP_LOGD("get_metadata : ERR");
1044 goto error;
1045 default:
1046 BT_COMP_LOGD("get_metadata : UNKNOWN");
1047 goto error;
1048 }
1049
1050 len = be64toh(rp.len);
1051 BT_COMP_LOGD("Writing %" PRIu64" bytes to metadata", len);
1052 if (len <= 0) {
1053 goto error;
1054 }
1055
1056 data = calloc(1, len);
1057 if (!data) {
1058 BT_COMP_LOGE("relay data calloc: %s", strerror(errno));
1059 goto error;
1060 }
1061 ret_len = lttng_live_recv(viewer_connection, data, len);
1062 if (ret_len == 0) {
1063 BT_COMP_LOGI("Remote side has closed connection");
1064 goto error_free_data;
1065 }
1066 if (ret_len == BT_SOCKET_ERROR) {
1067 BT_COMP_LOGE("Error receiving trace packet: %s", bt_socket_errormsg());
1068 goto error_free_data;
1069 }
1070 BT_ASSERT(ret_len == len);
1071
1072 do {
1073 ret_len = fwrite(data, 1, len, fp);
1074 } while (ret_len < 0 && errno == EINTR);
1075 if (ret_len < 0) {
1076 BT_COMP_LOGE("Writing in the metadata fp");
1077 goto error_free_data;
1078 }
1079 BT_ASSERT(ret_len == len);
1080 free(data);
1081 ret = len;
1082 end:
1083 return ret;
1084
1085 error_free_data:
1086 free(data);
1087 error:
1088 return -1;
1089 }
1090
1091 /*
1092 * Assign the fields from a lttng_viewer_index to a packet_index.
1093 */
1094 static
1095 void lttng_index_to_packet_index(struct lttng_viewer_index *lindex,
1096 struct packet_index *pindex)
1097 {
1098 BT_ASSERT(lindex);
1099 BT_ASSERT(pindex);
1100
1101 pindex->offset = be64toh(lindex->offset);
1102 pindex->packet_size = be64toh(lindex->packet_size);
1103 pindex->content_size = be64toh(lindex->content_size);
1104 pindex->ts_cycles.timestamp_begin = be64toh(lindex->timestamp_begin);
1105 pindex->ts_cycles.timestamp_end = be64toh(lindex->timestamp_end);
1106 pindex->events_discarded = be64toh(lindex->events_discarded);
1107 }
1108
1109 BT_HIDDEN
1110 enum lttng_live_iterator_status lttng_live_get_next_index(
1111 struct lttng_live_msg_iter *lttng_live_msg_iter,
1112 struct lttng_live_stream_iterator *stream,
1113 struct packet_index *index)
1114 {
1115 struct lttng_viewer_cmd cmd;
1116 struct lttng_viewer_get_next_index rq;
1117 ssize_t ret_len;
1118 struct lttng_viewer_index rp;
1119 uint32_t flags, status;
1120 enum lttng_live_iterator_status retstatus =
1121 LTTNG_LIVE_ITERATOR_STATUS_OK;
1122 struct live_viewer_connection *viewer_connection =
1123 lttng_live_msg_iter->viewer_connection;
1124 struct lttng_live_trace *trace = stream->trace;
1125 const size_t cmd_buf_len = sizeof(cmd) + sizeof(rq);
1126 char cmd_buf[cmd_buf_len];
1127 struct lttng_live_component *lttng_live =
1128 lttng_live_msg_iter->lttng_live_comp;
1129
1130 cmd.cmd = htobe32(LTTNG_VIEWER_GET_NEXT_INDEX);
1131 cmd.data_size = htobe64((uint64_t) sizeof(rq));
1132 cmd.cmd_version = htobe32(0);
1133
1134
1135 memset(&rq, 0, sizeof(rq));
1136 rq.stream_id = htobe64(stream->viewer_stream_id);
1137
1138 /*
1139 * Merge the cmd and connection request to prevent a write-write
1140 * sequence on the TCP socket. Otherwise, a delayed ACK will prevent the
1141 * second write to be performed quickly in presence of Nagle's algorithm.
1142 */
1143 memcpy(cmd_buf, &cmd, sizeof(cmd));
1144 memcpy(cmd_buf + sizeof(cmd), &rq, sizeof(rq));
1145 ret_len = lttng_live_send(viewer_connection, &cmd_buf, cmd_buf_len);
1146 if (ret_len == BT_SOCKET_ERROR) {
1147 BT_COMP_LOGE("Error sending get_next_index request: %s",
1148 bt_socket_errormsg());
1149 goto error;
1150 }
1151
1152 BT_ASSERT(ret_len == cmd_buf_len);
1153 ret_len = lttng_live_recv(viewer_connection, &rp, sizeof(rp));
1154 if (ret_len == 0) {
1155 BT_COMP_LOGI("Remote side has closed connection");
1156 goto error;
1157 }
1158 if (ret_len == BT_SOCKET_ERROR) {
1159 BT_COMP_LOGE("Error receiving get_next_index response: %s",
1160 bt_socket_errormsg());
1161 goto error;
1162 }
1163 BT_ASSERT(ret_len == sizeof(rp));
1164
1165 flags = be32toh(rp.flags);
1166 status = be32toh(rp.status);
1167
1168 switch (status) {
1169 case LTTNG_VIEWER_INDEX_INACTIVE:
1170 {
1171 uint64_t ctf_stream_class_id;
1172
1173 BT_COMP_LOGD("get_next_index: inactive");
1174 memset(index, 0, sizeof(struct packet_index));
1175 index->ts_cycles.timestamp_end = be64toh(rp.timestamp_end);
1176 stream->current_inactivity_ts = index->ts_cycles.timestamp_end;
1177 ctf_stream_class_id = be64toh(rp.stream_id);
1178 if (stream->ctf_stream_class_id != -1ULL) {
1179 BT_ASSERT(stream->ctf_stream_class_id ==
1180 ctf_stream_class_id);
1181 } else {
1182 stream->ctf_stream_class_id = ctf_stream_class_id;
1183 }
1184 stream->state = LTTNG_LIVE_STREAM_QUIESCENT;
1185 break;
1186 }
1187 case LTTNG_VIEWER_INDEX_OK:
1188 {
1189 uint64_t ctf_stream_class_id;
1190
1191 BT_COMP_LOGD("get_next_index: OK");
1192 lttng_index_to_packet_index(&rp, index);
1193 ctf_stream_class_id = be64toh(rp.stream_id);
1194 if (stream->ctf_stream_class_id != -1ULL) {
1195 BT_ASSERT(stream->ctf_stream_class_id ==
1196 ctf_stream_class_id);
1197 } else {
1198 stream->ctf_stream_class_id = ctf_stream_class_id;
1199 }
1200
1201 stream->state = LTTNG_LIVE_STREAM_ACTIVE_DATA;
1202
1203 if (flags & LTTNG_VIEWER_FLAG_NEW_METADATA) {
1204 BT_COMP_LOGD("get_next_index: new metadata needed");
1205 trace->new_metadata_needed = true;
1206 }
1207 if (flags & LTTNG_VIEWER_FLAG_NEW_STREAM) {
1208 BT_COMP_LOGD("get_next_index: new streams needed");
1209 lttng_live_need_new_streams(lttng_live_msg_iter);
1210 }
1211 break;
1212 }
1213 case LTTNG_VIEWER_INDEX_RETRY:
1214 BT_COMP_LOGD("get_next_index: retry");
1215 memset(index, 0, sizeof(struct packet_index));
1216 retstatus = LTTNG_LIVE_ITERATOR_STATUS_AGAIN;
1217 stream->state = LTTNG_LIVE_STREAM_ACTIVE_NO_DATA;
1218 goto end;
1219 case LTTNG_VIEWER_INDEX_HUP:
1220 BT_COMP_LOGD("get_next_index: stream hung up");
1221 memset(index, 0, sizeof(struct packet_index));
1222 index->offset = EOF;
1223 retstatus = LTTNG_LIVE_ITERATOR_STATUS_END;
1224 stream->state = LTTNG_LIVE_STREAM_EOF;
1225 break;
1226 case LTTNG_VIEWER_INDEX_ERR:
1227 BT_COMP_LOGE("get_next_index: error");
1228 memset(index, 0, sizeof(struct packet_index));
1229 stream->state = LTTNG_LIVE_STREAM_ACTIVE_NO_DATA;
1230 goto error;
1231 default:
1232 BT_COMP_LOGE("get_next_index: unknown value");
1233 memset(index, 0, sizeof(struct packet_index));
1234 stream->state = LTTNG_LIVE_STREAM_ACTIVE_NO_DATA;
1235 goto error;
1236 }
1237 end:
1238 return retstatus;
1239
1240 error:
1241 if (lttng_live_graph_is_canceled(lttng_live)) {
1242 retstatus = LTTNG_LIVE_ITERATOR_STATUS_AGAIN;
1243 } else {
1244 retstatus = LTTNG_LIVE_ITERATOR_STATUS_ERROR;
1245 }
1246 return retstatus;
1247 }
1248
1249 BT_HIDDEN
1250 enum bt_msg_iter_medium_status lttng_live_get_stream_bytes(
1251 struct lttng_live_msg_iter *lttng_live_msg_iter,
1252 struct lttng_live_stream_iterator *stream, uint8_t *buf,
1253 uint64_t offset, uint64_t req_len, uint64_t *recv_len)
1254 {
1255 enum bt_msg_iter_medium_status retstatus = BT_MSG_ITER_MEDIUM_STATUS_OK;
1256 struct lttng_viewer_cmd cmd;
1257 struct lttng_viewer_get_packet rq;
1258 struct lttng_viewer_trace_packet rp;
1259 ssize_t ret_len;
1260 uint32_t flags, status;
1261 struct live_viewer_connection *viewer_connection =
1262 lttng_live_msg_iter->viewer_connection;
1263 struct lttng_live_trace *trace = stream->trace;
1264 const size_t cmd_buf_len = sizeof(cmd) + sizeof(rq);
1265 char cmd_buf[cmd_buf_len];
1266 struct lttng_live_component *lttng_live =
1267 lttng_live_msg_iter->lttng_live_comp;
1268
1269 BT_COMP_LOGD("lttng_live_get_stream_bytes: offset=%" PRIu64 ", req_len=%" PRIu64,
1270 offset, req_len);
1271 cmd.cmd = htobe32(LTTNG_VIEWER_GET_PACKET);
1272 cmd.data_size = htobe64((uint64_t) sizeof(rq));
1273 cmd.cmd_version = htobe32(0);
1274
1275 memset(&rq, 0, sizeof(rq));
1276 rq.stream_id = htobe64(stream->viewer_stream_id);
1277 rq.offset = htobe64(offset);
1278 rq.len = htobe32(req_len);
1279
1280 /*
1281 * Merge the cmd and connection request to prevent a write-write
1282 * sequence on the TCP socket. Otherwise, a delayed ACK will prevent the
1283 * second write to be performed quickly in presence of Nagle's algorithm.
1284 */
1285 memcpy(cmd_buf, &cmd, sizeof(cmd));
1286 memcpy(cmd_buf + sizeof(cmd), &rq, sizeof(rq));
1287 ret_len = lttng_live_send(viewer_connection, &cmd_buf, cmd_buf_len);
1288 if (ret_len == BT_SOCKET_ERROR) {
1289 BT_COMP_LOGE("Error sending get_data request: %s", bt_socket_errormsg());
1290 goto error;
1291 }
1292
1293 BT_ASSERT(ret_len == cmd_buf_len);
1294 ret_len = lttng_live_recv(viewer_connection, &rp, sizeof(rp));
1295 if (ret_len == 0) {
1296 BT_COMP_LOGI("Remote side has closed connection");
1297 goto error;
1298 }
1299 if (ret_len == BT_SOCKET_ERROR) {
1300 BT_COMP_LOGE("Error receiving get_data response: %s", bt_socket_errormsg());
1301 goto error;
1302 }
1303 if (ret_len != sizeof(rp)) {
1304 BT_COMP_LOGE("get_data_packet: expected %zu"
1305 ", received %zd", sizeof(rp),
1306 ret_len);
1307 goto error;
1308 }
1309
1310 flags = be32toh(rp.flags);
1311 status = be32toh(rp.status);
1312
1313 switch (status) {
1314 case LTTNG_VIEWER_GET_PACKET_OK:
1315 req_len = be32toh(rp.len);
1316 BT_COMP_LOGD("get_data_packet: Ok, packet size : %" PRIu64 "", req_len);
1317 break;
1318 case LTTNG_VIEWER_GET_PACKET_RETRY:
1319 /* Unimplemented by relay daemon */
1320 BT_COMP_LOGD("get_data_packet: retry");
1321 retstatus = BT_MSG_ITER_MEDIUM_STATUS_AGAIN;
1322 goto end;
1323 case LTTNG_VIEWER_GET_PACKET_ERR:
1324 if (flags & LTTNG_VIEWER_FLAG_NEW_METADATA) {
1325 BT_COMP_LOGD("get_data_packet: new metadata needed, try again later");
1326 trace->new_metadata_needed = true;
1327 }
1328 if (flags & LTTNG_VIEWER_FLAG_NEW_STREAM) {
1329 BT_COMP_LOGD("get_data_packet: new streams needed, try again later");
1330 lttng_live_need_new_streams(lttng_live_msg_iter);
1331 }
1332 if (flags & (LTTNG_VIEWER_FLAG_NEW_METADATA
1333 | LTTNG_VIEWER_FLAG_NEW_STREAM)) {
1334 retstatus = BT_MSG_ITER_MEDIUM_STATUS_AGAIN;
1335 goto end;
1336 }
1337 BT_COMP_LOGE("get_data_packet: error");
1338 goto error;
1339 case LTTNG_VIEWER_GET_PACKET_EOF:
1340 retstatus = BT_MSG_ITER_MEDIUM_STATUS_EOF;
1341 goto end;
1342 default:
1343 BT_COMP_LOGE("get_data_packet: unknown");
1344 goto error;
1345 }
1346
1347 if (req_len == 0) {
1348 goto error;
1349 }
1350
1351 ret_len = lttng_live_recv(viewer_connection, buf, req_len);
1352 if (ret_len == 0) {
1353 BT_COMP_LOGI("Remote side has closed connection");
1354 goto error;
1355 }
1356 if (ret_len == BT_SOCKET_ERROR) {
1357 BT_COMP_LOGE("Error receiving trace packet: %s", bt_socket_errormsg());
1358 goto error;
1359 }
1360 BT_ASSERT(ret_len == req_len);
1361 *recv_len = ret_len;
1362 end:
1363 return retstatus;
1364
1365 error:
1366 if (lttng_live_graph_is_canceled(lttng_live)) {
1367 retstatus = BT_MSG_ITER_MEDIUM_STATUS_AGAIN;
1368 } else {
1369 retstatus = BT_MSG_ITER_MEDIUM_STATUS_ERROR;
1370 }
1371 return retstatus;
1372 }
1373
1374 /*
1375 * Request new streams for a session.
1376 */
1377 BT_HIDDEN
1378 enum lttng_live_iterator_status lttng_live_get_new_streams(
1379 struct lttng_live_session *session)
1380 {
1381 enum lttng_live_iterator_status status =
1382 LTTNG_LIVE_ITERATOR_STATUS_OK;
1383 struct lttng_viewer_cmd cmd;
1384 struct lttng_viewer_new_streams_request rq;
1385 struct lttng_viewer_new_streams_response rp;
1386 ssize_t ret_len;
1387 struct lttng_live_msg_iter *lttng_live_msg_iter =
1388 session->lttng_live_msg_iter;
1389 struct live_viewer_connection *viewer_connection =
1390 lttng_live_msg_iter->viewer_connection;
1391 struct lttng_live_component *lttng_live =
1392 lttng_live_msg_iter->lttng_live_comp;
1393 uint32_t streams_count;
1394 const size_t cmd_buf_len = sizeof(cmd) + sizeof(rq);
1395 char cmd_buf[cmd_buf_len];
1396
1397 if (!session->new_streams_needed) {
1398 return LTTNG_LIVE_ITERATOR_STATUS_OK;
1399 }
1400
1401 cmd.cmd = htobe32(LTTNG_VIEWER_GET_NEW_STREAMS);
1402 cmd.data_size = htobe64((uint64_t) sizeof(rq));
1403 cmd.cmd_version = htobe32(0);
1404
1405 memset(&rq, 0, sizeof(rq));
1406 rq.session_id = htobe64(session->id);
1407
1408 /*
1409 * Merge the cmd and connection request to prevent a write-write
1410 * sequence on the TCP socket. Otherwise, a delayed ACK will prevent the
1411 * second write to be performed quickly in presence of Nagle's algorithm.
1412 */
1413 memcpy(cmd_buf, &cmd, sizeof(cmd));
1414 memcpy(cmd_buf + sizeof(cmd), &rq, sizeof(rq));
1415 ret_len = lttng_live_send(viewer_connection, &cmd_buf, cmd_buf_len);
1416 if (ret_len == BT_SOCKET_ERROR) {
1417 BT_COMP_LOGE("Error sending get_new_streams request: %s",
1418 bt_socket_errormsg());
1419 goto error;
1420 }
1421
1422 BT_ASSERT(ret_len == cmd_buf_len);
1423 ret_len = lttng_live_recv(viewer_connection, &rp, sizeof(rp));
1424 if (ret_len == 0) {
1425 BT_COMP_LOGI("Remote side has closed connection");
1426 goto error;
1427 }
1428 if (ret_len == BT_SOCKET_ERROR) {
1429 BT_COMP_LOGE("Error receiving get_new_streams response");
1430 goto error;
1431 }
1432 BT_ASSERT(ret_len == sizeof(rp));
1433
1434 streams_count = be32toh(rp.streams_count);
1435
1436 switch(be32toh(rp.status)) {
1437 case LTTNG_VIEWER_NEW_STREAMS_OK:
1438 session->new_streams_needed = false;
1439 break;
1440 case LTTNG_VIEWER_NEW_STREAMS_NO_NEW:
1441 session->new_streams_needed = false;
1442 goto end;
1443 case LTTNG_VIEWER_NEW_STREAMS_HUP:
1444 session->new_streams_needed = false;
1445 session->closed = true;
1446 status = LTTNG_LIVE_ITERATOR_STATUS_END;
1447 goto end;
1448 case LTTNG_VIEWER_NEW_STREAMS_ERR:
1449 BT_COMP_LOGE("get_new_streams error");
1450 goto error;
1451 default:
1452 BT_COMP_LOGE("Unknown return code %u", be32toh(rp.status));
1453 goto error;
1454 }
1455
1456 if (receive_streams(session, streams_count)) {
1457 goto error;
1458 }
1459 end:
1460 return status;
1461
1462 error:
1463 if (lttng_live_graph_is_canceled(lttng_live)) {
1464 status = LTTNG_LIVE_ITERATOR_STATUS_AGAIN;
1465 } else {
1466 status = LTTNG_LIVE_ITERATOR_STATUS_ERROR;
1467 }
1468 return status;
1469 }
1470
1471 BT_HIDDEN
1472 struct live_viewer_connection *live_viewer_connection_create(
1473 const char *url, bool in_query,
1474 struct lttng_live_msg_iter *lttng_live_msg_iter)
1475 {
1476 struct live_viewer_connection *viewer_connection;
1477
1478 viewer_connection = g_new0(struct live_viewer_connection, 1);
1479
1480 if (bt_socket_init() != 0) {
1481 goto error;
1482 }
1483
1484 viewer_connection->log_level = lttng_live_msg_iter->log_level;
1485 viewer_connection->self_comp = lttng_live_msg_iter->self_comp;
1486 bt_object_init_shared(&viewer_connection->obj, connection_release);
1487 viewer_connection->control_sock = BT_INVALID_SOCKET;
1488 viewer_connection->port = -1;
1489 viewer_connection->in_query = in_query;
1490 viewer_connection->lttng_live_msg_iter = lttng_live_msg_iter;
1491 viewer_connection->url = g_string_new(url);
1492 if (!viewer_connection->url) {
1493 goto error;
1494 }
1495
1496 BT_COMP_LOGI("Establishing connection to url \"%s\"...", url);
1497 if (lttng_live_connect_viewer(viewer_connection)) {
1498 goto error_report;
1499 }
1500 BT_COMP_LOGI("Connection to url \"%s\" is established", url);
1501 return viewer_connection;
1502
1503 error_report:
1504 BT_COMP_LOGW("Failure to establish connection to url \"%s\"", url);
1505 error:
1506 g_free(viewer_connection);
1507 return NULL;
1508 }
1509
1510 BT_HIDDEN
1511 void live_viewer_connection_destroy(
1512 struct live_viewer_connection *viewer_connection)
1513 {
1514 BT_COMP_LOGI("Closing connection to url \"%s\"", viewer_connection->url->str);
1515 lttng_live_disconnect_viewer(viewer_connection);
1516 g_string_free(viewer_connection->url, true);
1517 if (viewer_connection->relay_hostname) {
1518 g_string_free(viewer_connection->relay_hostname, true);
1519 }
1520 if (viewer_connection->target_hostname) {
1521 g_string_free(viewer_connection->target_hostname, true);
1522 }
1523 if (viewer_connection->session_name) {
1524 g_string_free(viewer_connection->session_name, true);
1525 }
1526 g_free(viewer_connection);
1527
1528 bt_socket_fini();
1529 }
BabelTrace - Trace Format Babel Tower
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