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ddc250145068c69913d0fed9ad154ff5172539ad
[babeltrace.git] / src / plugins / ctf / lttng-live / viewer-connection.c
1 /*
2 * Copyright 2019 - Francis Deslauriers <francis.deslauriers@efficios.com>
3 * Copyright 2016 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining a copy
6 * of this software and associated documentation files (the "Software"), to deal
7 * in the Software without restriction, including without limitation the rights
8 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
9 * copies of the Software, and to permit persons to whom the Software is
10 * furnished to do so, subject to the following conditions:
11 *
12 * The above copyright notice and this permission notice shall be included in
13 * all copies or substantial portions of the Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
21 * SOFTWARE.
22 */
23
24 #define BT_COMP_LOG_SELF_COMP (viewer_connection->self_comp)
25 #define BT_LOG_OUTPUT_LEVEL (viewer_connection->log_level)
26 #define BT_LOG_TAG "PLUGIN/SRC.CTF.LTTNG-LIVE/VIEWER"
27 #include "logging/comp-logging.h"
28
29 #include <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)) {
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)) {
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 ?
153 "<none>" : viewer_connection->target_hostname->str,
154 !viewer_connection->session_name ?
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_length(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) == 0
351 && strcmp(session->session_name, session_name_str) == 0) {
352 int64_t val;
353 uint32_t streams = be32toh(session->streams);
354 uint32_t clients = be32toh(session->clients);
355
356 found = true;
357
358 btval = bt_value_map_borrow_entry_value(map, "stream-count");
359 if (!btval) {
360 BT_COMP_LOGE_STR("Error borrowing \"stream-count\" entry.");
361 ret = -1;
362 goto end;
363 }
364 val = bt_value_integer_unsigned_get(btval);
365 /* sum */
366 val += streams;
367 bt_value_integer_unsigned_set(btval, val);
368
369 btval = bt_value_map_borrow_entry_value(map, "client-count");
370 if (!btval) {
371 BT_COMP_LOGE_STR("Error borrowing \"client-count\" entry.");
372 ret = -1;
373 goto end;
374 }
375 val = bt_value_integer_unsigned_get(btval);
376 /* max */
377 val = bt_max_t(int64_t, clients, val);
378 bt_value_integer_unsigned_set(btval, val);
379 }
380
381 if (found) {
382 break;
383 }
384 }
385 end:
386 *_found = found;
387 return ret;
388 }
389
390 static
391 int list_append_session(bt_value *results,
392 GString *base_url,
393 const struct lttng_viewer_session *session,
394 struct live_viewer_connection *viewer_connection)
395 {
396 int ret = 0;
397 bt_value_map_insert_entry_status insert_status;
398 bt_value_array_append_element_status append_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 insert_status = bt_value_map_insert_string_entry(map, "url", url->str);
435 if (insert_status != BT_VALUE_MAP_INSERT_ENTRY_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 insert_status = bt_value_map_insert_string_entry(map, "target-hostname",
446 session->hostname);
447 if (insert_status != BT_VALUE_MAP_INSERT_ENTRY_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 insert_status = bt_value_map_insert_string_entry(map, "session-name",
458 session->session_name);
459 if (insert_status != BT_VALUE_MAP_INSERT_ENTRY_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 insert_status = bt_value_map_insert_unsigned_integer_entry(
473 map, "timer-us", live_timer);
474 if (insert_status != BT_VALUE_MAP_INSERT_ENTRY_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 insert_status = bt_value_map_insert_unsigned_integer_entry(map,
489 "stream-count", streams);
490 if (insert_status != BT_VALUE_MAP_INSERT_ENTRY_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 insert_status = bt_value_map_insert_unsigned_integer_entry(map,
505 "client-count", clients);
506 if (insert_status != BT_VALUE_MAP_INSERT_ENTRY_STATUS_OK) {
507 BT_COMP_LOGE_STR("Error inserting \"client-count\" entry.");
508 ret = -1;
509 goto end;
510 }
511 }
512
513 append_status = bt_value_array_append_element(results, map);
514 if (append_status != BT_VALUE_ARRAY_APPEND_ELEMENT_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_component_class_query_method_status live_viewer_connection_list_sessions(
565 struct live_viewer_connection *viewer_connection,
566 const bt_value **user_result)
567 {
568 bt_component_class_query_method_status status =
569 BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_OK;
570 bt_value *result = NULL;
571 struct lttng_viewer_cmd cmd;
572 struct lttng_viewer_list_sessions list;
573 uint32_t i, sessions_count;
574 ssize_t ret_len;
575
576 result = bt_value_array_create();
577 if (!result) {
578 BT_COMP_LOGE("Error creating array");
579 status = BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_MEMORY_ERROR;
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_COMP_LOGE("Error sending cmd: %s", bt_socket_errormsg());
590 status = BT_COMPONENT_CLASS_QUERY_METHOD_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_COMP_LOGI("Remote side has closed connection");
598 status = BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_ERROR;
599 goto error;
600 }
601 if (ret_len == BT_SOCKET_ERROR) {
602 BT_COMP_LOGE("Error receiving session list: %s", bt_socket_errormsg());
603 status = BT_COMPONENT_CLASS_QUERY_METHOD_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_COMP_LOGI("Remote side has closed connection");
616 status = BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_ERROR;
617 goto error;
618 }
619 if (ret_len == BT_SOCKET_ERROR) {
620 BT_COMP_LOGE("Error receiving session: %s", bt_socket_errormsg());
621 status = BT_COMPONENT_CLASS_QUERY_METHOD_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, viewer_connection)) {
629 status = BT_COMPONENT_CLASS_QUERY_METHOD_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_COMP_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_COMP_LOGI("Remote side has closed connection");
668 goto error;
669 }
670 if (ret_len == BT_SOCKET_ERROR) {
671 BT_COMP_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_COMP_LOGI("Remote side has closed connection");
682 goto error;
683 }
684 if (ret_len == BT_SOCKET_ERROR) {
685 BT_COMP_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_COMP_LOGI("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_COMP_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_COMP_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_COMP_LOGI("Remote side has closed connection");
740 goto error;
741 }
742 if (ret_len == BT_SOCKET_ERROR) {
743 BT_COMP_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_COMP_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_COMP_LOGI("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_COMP_LOGI("Remote side has closed connection");
783 goto error;
784 }
785 if (ret_len == BT_SOCKET_ERROR) {
786 BT_COMP_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_COMP_LOGI(" 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_COMP_LOGE("Error creating metadata stream");
803
804 goto error;
805 }
806 session->lazy_stream_msg_init = true;
807 } else {
808 BT_COMP_LOGI(" 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_COMP_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_COMP_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_COMP_LOGI("Remote side has closed connection");
867 goto error;
868 }
869 if (ret_len == BT_SOCKET_ERROR) {
870 BT_COMP_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_COMP_LOGW("Session id %" PRIu64 " is unknown", session_id);
881 goto error;
882 case LTTNG_VIEWER_ATTACH_ALREADY:
883 BT_COMP_LOGW("There is already a viewer attached to this session");
884 goto error;
885 case LTTNG_VIEWER_ATTACH_NOT_LIVE:
886 BT_COMP_LOGW("Not a live session");
887 goto error;
888 case LTTNG_VIEWER_ATTACH_SEEK_ERR:
889 BT_COMP_LOGE("Wrong seek parameter");
890 goto error;
891 default:
892 BT_COMP_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_COMP_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_COMP_LOGI("Remote side has closed connection");
952 goto error;
953 }
954 if (ret_len == BT_SOCKET_ERROR) {
955 BT_COMP_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_COMP_LOGW("Session id %" PRIu64 " is unknown", session_id);
965 goto error;
966 case LTTNG_VIEWER_DETACH_SESSION_ERR:
967 BT_COMP_LOGW("Error detaching session id %" PRIu64 "", session_id);
968 goto error;
969 default:
970 BT_COMP_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_COMP_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_COMP_LOGI("Remote side has closed connection");
1023 goto error;
1024 }
1025 if (ret_len == BT_SOCKET_ERROR) {
1026 BT_COMP_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_COMP_LOGD("get_metadata : OK");
1034 break;
1035 case LTTNG_VIEWER_NO_NEW_METADATA:
1036 BT_COMP_LOGD("get_metadata : NO NEW");
1037 ret = 0;
1038 goto end;
1039 case LTTNG_VIEWER_METADATA_ERR:
1040 BT_COMP_LOGD("get_metadata : ERR");
1041 goto error;
1042 default:
1043 BT_COMP_LOGD("get_metadata : UNKNOWN");
1044 goto error;
1045 }
1046
1047 len = be64toh(rp.len);
1048 BT_COMP_LOGD("Writing %" PRIu64" bytes to metadata", len);
1049 if (len <= 0) {
1050 goto error;
1051 }
1052
1053 data = calloc(1, len);
1054 if (!data) {
1055 BT_COMP_LOGE("relay data calloc: %s", strerror(errno));
1056 goto error;
1057 }
1058 ret_len = lttng_live_recv(viewer_connection, data, len);
1059 if (ret_len == 0) {
1060 BT_COMP_LOGI("Remote side has closed connection");
1061 goto error_free_data;
1062 }
1063 if (ret_len == BT_SOCKET_ERROR) {
1064 BT_COMP_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_COMP_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
1125 cmd.cmd = htobe32(LTTNG_VIEWER_GET_NEXT_INDEX);
1126 cmd.data_size = htobe64((uint64_t) sizeof(rq));
1127 cmd.cmd_version = htobe32(0);
1128
1129
1130 memset(&rq, 0, sizeof(rq));
1131 rq.stream_id = htobe64(stream->viewer_stream_id);
1132
1133 /*
1134 * Merge the cmd and connection request to prevent a write-write
1135 * sequence on the TCP socket. Otherwise, a delayed ACK will prevent the
1136 * second write to be performed quickly in presence of Nagle's algorithm.
1137 */
1138 memcpy(cmd_buf, &cmd, sizeof(cmd));
1139 memcpy(cmd_buf + sizeof(cmd), &rq, sizeof(rq));
1140 ret_len = lttng_live_send(viewer_connection, &cmd_buf, cmd_buf_len);
1141 if (ret_len == BT_SOCKET_ERROR) {
1142 BT_COMP_LOGE("Error sending get_next_index request: %s",
1143 bt_socket_errormsg());
1144 goto error;
1145 }
1146
1147 BT_ASSERT(ret_len == cmd_buf_len);
1148 ret_len = lttng_live_recv(viewer_connection, &rp, sizeof(rp));
1149 if (ret_len == 0) {
1150 BT_COMP_LOGI("Remote side has closed connection");
1151 goto error;
1152 }
1153 if (ret_len == BT_SOCKET_ERROR) {
1154 BT_COMP_LOGE("Error receiving get_next_index response: %s",
1155 bt_socket_errormsg());
1156 goto error;
1157 }
1158 BT_ASSERT(ret_len == sizeof(rp));
1159
1160 flags = be32toh(rp.flags);
1161 status = be32toh(rp.status);
1162
1163 switch (status) {
1164 case LTTNG_VIEWER_INDEX_INACTIVE:
1165 {
1166 uint64_t ctf_stream_class_id;
1167
1168 BT_COMP_LOGD("get_next_index: inactive");
1169 memset(index, 0, sizeof(struct packet_index));
1170 index->ts_cycles.timestamp_end = be64toh(rp.timestamp_end);
1171 stream->current_inactivity_ts = index->ts_cycles.timestamp_end;
1172 ctf_stream_class_id = be64toh(rp.stream_id);
1173 if (stream->ctf_stream_class_id != -1ULL) {
1174 BT_ASSERT(stream->ctf_stream_class_id ==
1175 ctf_stream_class_id);
1176 } else {
1177 stream->ctf_stream_class_id = ctf_stream_class_id;
1178 }
1179 stream->state = LTTNG_LIVE_STREAM_QUIESCENT;
1180 break;
1181 }
1182 case LTTNG_VIEWER_INDEX_OK:
1183 {
1184 uint64_t ctf_stream_class_id;
1185
1186 BT_COMP_LOGD("get_next_index: OK");
1187 lttng_index_to_packet_index(&rp, index);
1188 ctf_stream_class_id = be64toh(rp.stream_id);
1189 if (stream->ctf_stream_class_id != -1ULL) {
1190 BT_ASSERT(stream->ctf_stream_class_id ==
1191 ctf_stream_class_id);
1192 } else {
1193 stream->ctf_stream_class_id = ctf_stream_class_id;
1194 }
1195
1196 stream->state = LTTNG_LIVE_STREAM_ACTIVE_DATA;
1197
1198 if (flags & LTTNG_VIEWER_FLAG_NEW_METADATA) {
1199 BT_COMP_LOGD("get_next_index: new metadata needed");
1200 trace->new_metadata_needed = true;
1201 }
1202 if (flags & LTTNG_VIEWER_FLAG_NEW_STREAM) {
1203 BT_COMP_LOGD("get_next_index: new streams needed");
1204 lttng_live_need_new_streams(lttng_live_msg_iter);
1205 }
1206 break;
1207 }
1208 case LTTNG_VIEWER_INDEX_RETRY:
1209 BT_COMP_LOGD("get_next_index: retry");
1210 memset(index, 0, sizeof(struct packet_index));
1211 retstatus = LTTNG_LIVE_ITERATOR_STATUS_AGAIN;
1212 stream->state = LTTNG_LIVE_STREAM_ACTIVE_NO_DATA;
1213 goto end;
1214 case LTTNG_VIEWER_INDEX_HUP:
1215 BT_COMP_LOGD("get_next_index: stream hung up");
1216 memset(index, 0, sizeof(struct packet_index));
1217 index->offset = EOF;
1218 retstatus = LTTNG_LIVE_ITERATOR_STATUS_END;
1219 stream->state = LTTNG_LIVE_STREAM_EOF;
1220 stream->has_stream_hung_up = true;
1221 break;
1222 case LTTNG_VIEWER_INDEX_ERR:
1223 BT_COMP_LOGE("get_next_index: error");
1224 memset(index, 0, sizeof(struct packet_index));
1225 stream->state = LTTNG_LIVE_STREAM_ACTIVE_NO_DATA;
1226 goto error;
1227 default:
1228 BT_COMP_LOGE("get_next_index: unknown value");
1229 memset(index, 0, sizeof(struct packet_index));
1230 stream->state = LTTNG_LIVE_STREAM_ACTIVE_NO_DATA;
1231 goto error;
1232 }
1233 end:
1234 return retstatus;
1235
1236 error:
1237 if (lttng_live_graph_is_canceled(lttng_live_msg_iter)) {
1238 retstatus = LTTNG_LIVE_ITERATOR_STATUS_AGAIN;
1239 } else {
1240 retstatus = LTTNG_LIVE_ITERATOR_STATUS_ERROR;
1241 }
1242 return retstatus;
1243 }
1244
1245 BT_HIDDEN
1246 enum bt_msg_iter_medium_status lttng_live_get_stream_bytes(
1247 struct lttng_live_msg_iter *lttng_live_msg_iter,
1248 struct lttng_live_stream_iterator *stream, uint8_t *buf,
1249 uint64_t offset, uint64_t req_len, uint64_t *recv_len)
1250 {
1251 enum bt_msg_iter_medium_status retstatus = BT_MSG_ITER_MEDIUM_STATUS_OK;
1252 struct lttng_viewer_cmd cmd;
1253 struct lttng_viewer_get_packet rq;
1254 struct lttng_viewer_trace_packet rp;
1255 ssize_t ret_len;
1256 uint32_t flags, status;
1257 struct live_viewer_connection *viewer_connection =
1258 lttng_live_msg_iter->viewer_connection;
1259 struct lttng_live_trace *trace = stream->trace;
1260 const size_t cmd_buf_len = sizeof(cmd) + sizeof(rq);
1261 char cmd_buf[cmd_buf_len];
1262
1263 BT_COMP_LOGD("lttng_live_get_stream_bytes: offset=%" PRIu64 ", req_len=%" PRIu64,
1264 offset, req_len);
1265 cmd.cmd = htobe32(LTTNG_VIEWER_GET_PACKET);
1266 cmd.data_size = htobe64((uint64_t) sizeof(rq));
1267 cmd.cmd_version = htobe32(0);
1268
1269 memset(&rq, 0, sizeof(rq));
1270 rq.stream_id = htobe64(stream->viewer_stream_id);
1271 rq.offset = htobe64(offset);
1272 rq.len = htobe32(req_len);
1273
1274 /*
1275 * Merge the cmd and connection request to prevent a write-write
1276 * sequence on the TCP socket. Otherwise, a delayed ACK will prevent the
1277 * second write to be performed quickly in presence of Nagle's algorithm.
1278 */
1279 memcpy(cmd_buf, &cmd, sizeof(cmd));
1280 memcpy(cmd_buf + sizeof(cmd), &rq, sizeof(rq));
1281 ret_len = lttng_live_send(viewer_connection, &cmd_buf, cmd_buf_len);
1282 if (ret_len == BT_SOCKET_ERROR) {
1283 BT_COMP_LOGE("Error sending get_data request: %s", bt_socket_errormsg());
1284 goto error;
1285 }
1286
1287 BT_ASSERT(ret_len == cmd_buf_len);
1288 ret_len = lttng_live_recv(viewer_connection, &rp, sizeof(rp));
1289 if (ret_len == 0) {
1290 BT_COMP_LOGI("Remote side has closed connection");
1291 goto error;
1292 }
1293 if (ret_len == BT_SOCKET_ERROR) {
1294 BT_COMP_LOGE("Error receiving get_data response: %s", bt_socket_errormsg());
1295 goto error;
1296 }
1297 if (ret_len != sizeof(rp)) {
1298 BT_COMP_LOGE("get_data_packet: expected %zu"
1299 ", received %zd", sizeof(rp),
1300 ret_len);
1301 goto error;
1302 }
1303
1304 flags = be32toh(rp.flags);
1305 status = be32toh(rp.status);
1306
1307 switch (status) {
1308 case LTTNG_VIEWER_GET_PACKET_OK:
1309 req_len = be32toh(rp.len);
1310 BT_COMP_LOGD("get_data_packet: Ok, packet size : %" PRIu64 "", req_len);
1311 break;
1312 case LTTNG_VIEWER_GET_PACKET_RETRY:
1313 /* Unimplemented by relay daemon */
1314 BT_COMP_LOGD("get_data_packet: retry");
1315 retstatus = BT_MSG_ITER_MEDIUM_STATUS_AGAIN;
1316 goto end;
1317 case LTTNG_VIEWER_GET_PACKET_ERR:
1318 if (flags & LTTNG_VIEWER_FLAG_NEW_METADATA) {
1319 BT_COMP_LOGD("get_data_packet: new metadata needed, try again later");
1320 trace->new_metadata_needed = true;
1321 }
1322 if (flags & LTTNG_VIEWER_FLAG_NEW_STREAM) {
1323 BT_COMP_LOGD("get_data_packet: new streams needed, try again later");
1324 lttng_live_need_new_streams(lttng_live_msg_iter);
1325 }
1326 if (flags & (LTTNG_VIEWER_FLAG_NEW_METADATA
1327 | LTTNG_VIEWER_FLAG_NEW_STREAM)) {
1328 retstatus = BT_MSG_ITER_MEDIUM_STATUS_AGAIN;
1329 goto end;
1330 }
1331 BT_COMP_LOGE("get_data_packet: error");
1332 goto error;
1333 case LTTNG_VIEWER_GET_PACKET_EOF:
1334 retstatus = BT_MSG_ITER_MEDIUM_STATUS_EOF;
1335 goto end;
1336 default:
1337 BT_COMP_LOGE("get_data_packet: unknown");
1338 goto error;
1339 }
1340
1341 if (req_len == 0) {
1342 goto error;
1343 }
1344
1345 ret_len = lttng_live_recv(viewer_connection, buf, req_len);
1346 if (ret_len == 0) {
1347 BT_COMP_LOGI("Remote side has closed connection");
1348 goto error;
1349 }
1350 if (ret_len == BT_SOCKET_ERROR) {
1351 BT_COMP_LOGE("Error receiving trace packet: %s", bt_socket_errormsg());
1352 goto error;
1353 }
1354 BT_ASSERT(ret_len == req_len);
1355 *recv_len = ret_len;
1356 end:
1357 return retstatus;
1358
1359 error:
1360 if (lttng_live_graph_is_canceled(lttng_live_msg_iter)) {
1361 retstatus = BT_MSG_ITER_MEDIUM_STATUS_AGAIN;
1362 } else {
1363 retstatus = BT_MSG_ITER_MEDIUM_STATUS_ERROR;
1364 }
1365 return retstatus;
1366 }
1367
1368 /*
1369 * Request new streams for a session.
1370 */
1371 BT_HIDDEN
1372 enum lttng_live_iterator_status lttng_live_get_new_streams(
1373 struct lttng_live_session *session)
1374 {
1375 enum lttng_live_iterator_status status =
1376 LTTNG_LIVE_ITERATOR_STATUS_OK;
1377 struct lttng_viewer_cmd cmd;
1378 struct lttng_viewer_new_streams_request rq;
1379 struct lttng_viewer_new_streams_response rp;
1380 ssize_t ret_len;
1381 struct lttng_live_msg_iter *lttng_live_msg_iter =
1382 session->lttng_live_msg_iter;
1383 struct live_viewer_connection *viewer_connection =
1384 lttng_live_msg_iter->viewer_connection;
1385 uint32_t streams_count;
1386 const size_t cmd_buf_len = sizeof(cmd) + sizeof(rq);
1387 char cmd_buf[cmd_buf_len];
1388
1389 if (!session->new_streams_needed) {
1390 return LTTNG_LIVE_ITERATOR_STATUS_OK;
1391 }
1392
1393 cmd.cmd = htobe32(LTTNG_VIEWER_GET_NEW_STREAMS);
1394 cmd.data_size = htobe64((uint64_t) sizeof(rq));
1395 cmd.cmd_version = htobe32(0);
1396
1397 memset(&rq, 0, sizeof(rq));
1398 rq.session_id = htobe64(session->id);
1399
1400 /*
1401 * Merge the cmd and connection request to prevent a write-write
1402 * sequence on the TCP socket. Otherwise, a delayed ACK will prevent the
1403 * second write to be performed quickly in presence of Nagle's algorithm.
1404 */
1405 memcpy(cmd_buf, &cmd, sizeof(cmd));
1406 memcpy(cmd_buf + sizeof(cmd), &rq, sizeof(rq));
1407 ret_len = lttng_live_send(viewer_connection, &cmd_buf, cmd_buf_len);
1408 if (ret_len == BT_SOCKET_ERROR) {
1409 BT_COMP_LOGE("Error sending get_new_streams request: %s",
1410 bt_socket_errormsg());
1411 goto error;
1412 }
1413
1414 BT_ASSERT(ret_len == cmd_buf_len);
1415 ret_len = lttng_live_recv(viewer_connection, &rp, sizeof(rp));
1416 if (ret_len == 0) {
1417 BT_COMP_LOGI("Remote side has closed connection");
1418 goto error;
1419 }
1420 if (ret_len == BT_SOCKET_ERROR) {
1421 BT_COMP_LOGE("Error receiving get_new_streams response");
1422 goto error;
1423 }
1424 BT_ASSERT(ret_len == sizeof(rp));
1425
1426 streams_count = be32toh(rp.streams_count);
1427
1428 switch(be32toh(rp.status)) {
1429 case LTTNG_VIEWER_NEW_STREAMS_OK:
1430 session->new_streams_needed = false;
1431 break;
1432 case LTTNG_VIEWER_NEW_STREAMS_NO_NEW:
1433 session->new_streams_needed = false;
1434 goto end;
1435 case LTTNG_VIEWER_NEW_STREAMS_HUP:
1436 session->new_streams_needed = false;
1437 session->closed = true;
1438 status = LTTNG_LIVE_ITERATOR_STATUS_END;
1439 goto end;
1440 case LTTNG_VIEWER_NEW_STREAMS_ERR:
1441 BT_COMP_LOGE("get_new_streams error");
1442 goto error;
1443 default:
1444 BT_COMP_LOGE("Unknown return code %u", be32toh(rp.status));
1445 goto error;
1446 }
1447
1448 if (receive_streams(session, streams_count)) {
1449 goto error;
1450 }
1451 end:
1452 return status;
1453
1454 error:
1455 if (lttng_live_graph_is_canceled(lttng_live_msg_iter)) {
1456 status = LTTNG_LIVE_ITERATOR_STATUS_AGAIN;
1457 } else {
1458 status = LTTNG_LIVE_ITERATOR_STATUS_ERROR;
1459 }
1460 return status;
1461 }
1462
1463 BT_HIDDEN
1464 struct live_viewer_connection *live_viewer_connection_create(
1465 const char *url, bool in_query,
1466 struct lttng_live_msg_iter *lttng_live_msg_iter,
1467 bt_logging_level log_level)
1468 {
1469 struct live_viewer_connection *viewer_connection;
1470
1471 viewer_connection = g_new0(struct live_viewer_connection, 1);
1472
1473 if (bt_socket_init(log_level) != 0) {
1474 goto error;
1475 }
1476
1477 viewer_connection->log_level = log_level;
1478
1479 if (lttng_live_msg_iter) {
1480 viewer_connection->self_comp = lttng_live_msg_iter->self_comp;
1481 }
1482
1483 bt_object_init_shared(&viewer_connection->obj, connection_release);
1484 viewer_connection->control_sock = BT_INVALID_SOCKET;
1485 viewer_connection->port = -1;
1486 viewer_connection->in_query = in_query;
1487 viewer_connection->lttng_live_msg_iter = lttng_live_msg_iter;
1488 viewer_connection->url = g_string_new(url);
1489 if (!viewer_connection->url) {
1490 goto error;
1491 }
1492
1493 BT_COMP_LOGI("Establishing connection to url \"%s\"...", url);
1494 if (lttng_live_connect_viewer(viewer_connection)) {
1495 goto error_report;
1496 }
1497 BT_COMP_LOGI("Connection to url \"%s\" is established", url);
1498 return viewer_connection;
1499
1500 error_report:
1501 BT_COMP_LOGW("Failure to establish connection to url \"%s\"", url);
1502 error:
1503 if (viewer_connection) {
1504 live_viewer_connection_destroy(viewer_connection);
1505 }
1506
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 if (viewer_connection->url) {
1517 g_string_free(viewer_connection->url, true);
1518 }
1519 if (viewer_connection->relay_hostname) {
1520 g_string_free(viewer_connection->relay_hostname, true);
1521 }
1522 if (viewer_connection->target_hostname) {
1523 g_string_free(viewer_connection->target_hostname, true);
1524 }
1525 if (viewer_connection->session_name) {
1526 g_string_free(viewer_connection->session_name, true);
1527 }
1528 g_free(viewer_connection);
1529
1530 bt_socket_fini();
1531 }
BabelTrace - Trace Format Babel Tower
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