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9b9a78e255e67ee4b2894f40db938c9c24f8c8a1
[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, error_buf,
121 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 = lttng_live_url_parts.hostname;
128 lttng_live_url_parts.hostname = NULL;
129
130 if (lttng_live_url_parts.port >= 0) {
131 viewer_connection->port = lttng_live_url_parts.port;
132 } else {
133 viewer_connection->port = LTTNG_DEFAULT_NETWORK_VIEWER_PORT;
134 }
135
136 viewer_connection->target_hostname = lttng_live_url_parts.target_hostname;
137 lttng_live_url_parts.target_hostname = NULL;
138
139 if (lttng_live_url_parts.session_name) {
140 viewer_connection->session_name = lttng_live_url_parts.session_name;
141 lttng_live_url_parts.session_name = NULL;
142 }
143
144 BT_COMP_LOGI("Connecting to hostname : %s, port : %d, "
145 "target hostname : %s, session name : %s, proto : %s",
146 viewer_connection->relay_hostname->str,
147 viewer_connection->port,
148 !viewer_connection->target_hostname ?
149 "<none>" : viewer_connection->target_hostname->str,
150 !viewer_connection->session_name ?
151 "<none>" : viewer_connection->session_name->str,
152 lttng_live_url_parts.proto->str);
153 ret = 0;
154
155 end:
156 bt_common_destroy_lttng_live_url_parts(&lttng_live_url_parts);
157 return ret;
158 }
159
160 static
161 int lttng_live_handshake(struct live_viewer_connection *viewer_connection)
162 {
163 struct lttng_viewer_cmd cmd;
164 struct lttng_viewer_connect connect;
165 const size_t cmd_buf_len = sizeof(cmd) + sizeof(connect);
166 char cmd_buf[cmd_buf_len];
167 int ret;
168 ssize_t ret_len;
169
170 cmd.cmd = htobe32(LTTNG_VIEWER_CONNECT);
171 cmd.data_size = htobe64((uint64_t) sizeof(connect));
172 cmd.cmd_version = htobe32(0);
173
174 connect.viewer_session_id = -1ULL; /* will be set on recv */
175 connect.major = htobe32(LTTNG_LIVE_MAJOR);
176 connect.minor = htobe32(LTTNG_LIVE_MINOR);
177 connect.type = htobe32(LTTNG_VIEWER_CLIENT_COMMAND);
178
179 /*
180 * Merge the cmd and connection request to prevent a write-write
181 * sequence on the TCP socket. Otherwise, a delayed ACK will prevent the
182 * second write to be performed quickly in presence of Nagle's algorithm
183 */
184 memcpy(cmd_buf, &cmd, sizeof(cmd));
185 memcpy(cmd_buf + sizeof(cmd), &connect, sizeof(connect));
186 ret_len = lttng_live_send(viewer_connection, &cmd_buf, cmd_buf_len);
187 if (ret_len == BT_SOCKET_ERROR) {
188 BT_COMP_LOGE("Error sending version: %s", bt_socket_errormsg());
189 goto error;
190 }
191
192 BT_ASSERT(ret_len == cmd_buf_len);
193
194 ret_len = lttng_live_recv(viewer_connection, &connect, sizeof(connect));
195 if (ret_len == 0) {
196 BT_COMP_LOGI("Remote side has closed connection");
197 goto error;
198 }
199 if (ret_len == BT_SOCKET_ERROR) {
200 BT_COMP_LOGE("Error receiving version: %s", bt_socket_errormsg());
201 goto error;
202 }
203 BT_ASSERT(ret_len == sizeof(connect));
204
205 BT_COMP_LOGI("Received viewer session ID : %" PRIu64,
206 (uint64_t) be64toh(connect.viewer_session_id));
207 BT_COMP_LOGI("Relayd version : %u.%u", be32toh(connect.major),
208 be32toh(connect.minor));
209
210 if (LTTNG_LIVE_MAJOR != be32toh(connect.major)) {
211 BT_COMP_LOGE("Incompatible lttng-relayd protocol");
212 goto error;
213 }
214 /* Use the smallest protocol version implemented. */
215 if (LTTNG_LIVE_MINOR > be32toh(connect.minor)) {
216 viewer_connection->minor = be32toh(connect.minor);
217 } else {
218 viewer_connection->minor = LTTNG_LIVE_MINOR;
219 }
220 viewer_connection->major = LTTNG_LIVE_MAJOR;
221 ret = 0;
222 return ret;
223
224 error:
225 BT_COMP_LOGE("Unable to establish connection");
226 return -1;
227 }
228
229 static
230 int lttng_live_connect_viewer(struct live_viewer_connection *viewer_connection)
231 {
232 struct hostent *host;
233 struct sockaddr_in server_addr;
234 int ret;
235
236 if (parse_url(viewer_connection)) {
237 goto error;
238 }
239
240 host = gethostbyname(viewer_connection->relay_hostname->str);
241 if (!host) {
242 BT_COMP_LOGE("Cannot lookup hostname %s",
243 viewer_connection->relay_hostname->str);
244 goto error;
245 }
246
247 if ((viewer_connection->control_sock = socket(AF_INET, SOCK_STREAM, 0)) == BT_INVALID_SOCKET) {
248 BT_COMP_LOGE("Socket creation failed: %s", bt_socket_errormsg());
249 goto error;
250 }
251
252 server_addr.sin_family = AF_INET;
253 server_addr.sin_port = htons(viewer_connection->port);
254 server_addr.sin_addr = *((struct in_addr *) host->h_addr);
255 memset(&(server_addr.sin_zero), 0, 8);
256
257 if (connect(viewer_connection->control_sock, (struct sockaddr *) &server_addr,
258 sizeof(struct sockaddr)) == BT_SOCKET_ERROR) {
259 BT_COMP_LOGE("Connection failed: %s", bt_socket_errormsg());
260 goto error;
261 }
262 if (lttng_live_handshake(viewer_connection)) {
263 goto error;
264 }
265
266 ret = 0;
267
268 return ret;
269
270 error:
271 if (viewer_connection->control_sock != BT_INVALID_SOCKET) {
272 if (bt_socket_close(viewer_connection->control_sock) == BT_SOCKET_ERROR) {
273 BT_COMP_LOGE("Close: %s", bt_socket_errormsg());
274 }
275 }
276 viewer_connection->control_sock = BT_INVALID_SOCKET;
277 return -1;
278 }
279
280 static
281 void lttng_live_disconnect_viewer(
282 struct live_viewer_connection *viewer_connection)
283 {
284 if (viewer_connection->control_sock == BT_INVALID_SOCKET) {
285 return;
286 }
287 if (bt_socket_close(viewer_connection->control_sock) == BT_SOCKET_ERROR) {
288 BT_COMP_LOGE("Close: %s", bt_socket_errormsg());
289 viewer_connection->control_sock = BT_INVALID_SOCKET;
290 }
291 }
292
293 static
294 void connection_release(bt_object *obj)
295 {
296 struct live_viewer_connection *conn =
297 container_of(obj, struct live_viewer_connection, obj);
298
299 live_viewer_connection_destroy(conn);
300 }
301
302 static
303 int list_update_session(bt_value *results,
304 const struct lttng_viewer_session *session,
305 bool *_found, struct live_viewer_connection *viewer_connection)
306 {
307 int ret = 0;
308 uint64_t i, len;
309 bt_value *map = NULL;
310 bt_value *hostname = NULL;
311 bt_value *session_name = NULL;
312 bt_value *btval = NULL;
313 bool found = false;
314
315 len = bt_value_array_get_length(results);
316 for (i = 0; i < len; i++) {
317 const char *hostname_str = NULL;
318 const char *session_name_str = NULL;
319
320 map = bt_value_array_borrow_element_by_index(results, i);
321 if (!map) {
322 BT_COMP_LOGE_STR("Error borrowing map.");
323 ret = -1;
324 goto end;
325 }
326 hostname = bt_value_map_borrow_entry_value(map, "target-hostname");
327 if (!hostname) {
328 BT_COMP_LOGE_STR("Error borrowing \"target-hostname\" entry.");
329 ret = -1;
330 goto end;
331 }
332 session_name = bt_value_map_borrow_entry_value(map, "session-name");
333 if (!session_name) {
334 BT_COMP_LOGE_STR("Error borrowing \"session-name\" entry.");
335 ret = -1;
336 goto end;
337 }
338 hostname_str = bt_value_string_get(hostname);
339 session_name_str = bt_value_string_get(session_name);
340
341 if (strcmp(session->hostname, hostname_str) == 0
342 && strcmp(session->session_name, session_name_str) == 0) {
343 int64_t val;
344 uint32_t streams = be32toh(session->streams);
345 uint32_t clients = be32toh(session->clients);
346
347 found = true;
348
349 btval = bt_value_map_borrow_entry_value(map, "stream-count");
350 if (!btval) {
351 BT_COMP_LOGE_STR("Error borrowing \"stream-count\" entry.");
352 ret = -1;
353 goto end;
354 }
355 val = bt_value_integer_unsigned_get(btval);
356 /* sum */
357 val += streams;
358 bt_value_integer_unsigned_set(btval, val);
359
360 btval = bt_value_map_borrow_entry_value(map, "client-count");
361 if (!btval) {
362 BT_COMP_LOGE_STR("Error borrowing \"client-count\" entry.");
363 ret = -1;
364 goto end;
365 }
366 val = bt_value_integer_unsigned_get(btval);
367 /* max */
368 val = bt_max_t(int64_t, clients, val);
369 bt_value_integer_unsigned_set(btval, val);
370 }
371
372 if (found) {
373 break;
374 }
375 }
376 end:
377 *_found = found;
378 return ret;
379 }
380
381 static
382 int list_append_session(bt_value *results,
383 GString *base_url,
384 const struct lttng_viewer_session *session,
385 struct live_viewer_connection *viewer_connection)
386 {
387 int ret = 0;
388 bt_value_map_insert_entry_status insert_status;
389 bt_value_array_append_element_status append_status;
390 bt_value *map = NULL;
391 GString *url = NULL;
392 bool found = false;
393
394 /*
395 * If the session already exists, add the stream count to it,
396 * and do max of client counts.
397 */
398 ret = list_update_session(results, session, &found, viewer_connection);
399 if (ret || found) {
400 goto end;
401 }
402
403 map = bt_value_map_create();
404 if (!map) {
405 BT_COMP_LOGE_STR("Error creating map value.");
406 ret = -1;
407 goto end;
408 }
409
410 if (base_url->len < 1) {
411 BT_COMP_LOGE_STR("Error: base_url length smaller than 1.");
412 ret = -1;
413 goto end;
414 }
415 /*
416 * key = "url",
417 * value = <string>,
418 */
419 url = g_string_new(base_url->str);
420 g_string_append(url, "/host/");
421 g_string_append(url, session->hostname);
422 g_string_append_c(url, '/');
423 g_string_append(url, session->session_name);
424
425 insert_status = bt_value_map_insert_string_entry(map, "url", url->str);
426 if (insert_status != BT_VALUE_MAP_INSERT_ENTRY_STATUS_OK) {
427 BT_COMP_LOGE_STR("Error inserting \"url\" entry.");
428 ret = -1;
429 goto end;
430 }
431
432 /*
433 * key = "target-hostname",
434 * value = <string>,
435 */
436 insert_status = bt_value_map_insert_string_entry(map, "target-hostname",
437 session->hostname);
438 if (insert_status != BT_VALUE_MAP_INSERT_ENTRY_STATUS_OK) {
439 BT_COMP_LOGE_STR("Error inserting \"target-hostname\" entry.");
440 ret = -1;
441 goto end;
442 }
443
444 /*
445 * key = "session-name",
446 * value = <string>,
447 */
448 insert_status = bt_value_map_insert_string_entry(map, "session-name",
449 session->session_name);
450 if (insert_status != BT_VALUE_MAP_INSERT_ENTRY_STATUS_OK) {
451 BT_COMP_LOGE_STR("Error inserting \"session-name\" entry.");
452 ret = -1;
453 goto end;
454 }
455
456 /*
457 * key = "timer-us",
458 * value = <integer>,
459 */
460 {
461 uint32_t live_timer = be32toh(session->live_timer);
462
463 insert_status = bt_value_map_insert_unsigned_integer_entry(
464 map, "timer-us", live_timer);
465 if (insert_status != BT_VALUE_MAP_INSERT_ENTRY_STATUS_OK) {
466 BT_COMP_LOGE_STR("Error inserting \"timer-us\" entry.");
467 ret = -1;
468 goto end;
469 }
470 }
471
472 /*
473 * key = "stream-count",
474 * value = <integer>,
475 */
476 {
477 uint32_t streams = be32toh(session->streams);
478
479 insert_status = bt_value_map_insert_unsigned_integer_entry(map,
480 "stream-count", streams);
481 if (insert_status != BT_VALUE_MAP_INSERT_ENTRY_STATUS_OK) {
482 BT_COMP_LOGE_STR("Error inserting \"stream-count\" entry.");
483 ret = -1;
484 goto end;
485 }
486 }
487
488 /*
489 * key = "client-count",
490 * value = <integer>,
491 */
492 {
493 uint32_t clients = be32toh(session->clients);
494
495 insert_status = bt_value_map_insert_unsigned_integer_entry(map,
496 "client-count", clients);
497 if (insert_status != BT_VALUE_MAP_INSERT_ENTRY_STATUS_OK) {
498 BT_COMP_LOGE_STR("Error inserting \"client-count\" entry.");
499 ret = -1;
500 goto end;
501 }
502 }
503
504 append_status = bt_value_array_append_element(results, map);
505 if (append_status != BT_VALUE_ARRAY_APPEND_ELEMENT_STATUS_OK) {
506 BT_COMP_LOGE_STR("Error appending map to results.");
507 ret = -1;
508 }
509
510 end:
511 if (url) {
512 g_string_free(url, true);
513 }
514 BT_VALUE_PUT_REF_AND_RESET(map);
515 return ret;
516 }
517
518 /*
519 * Data structure returned:
520 *
521 * {
522 * <array> = {
523 * [n] = {
524 * <map> = {
525 * {
526 * key = "url",
527 * value = <string>,
528 * },
529 * {
530 * key = "target-hostname",
531 * value = <string>,
532 * },
533 * {
534 * key = "session-name",
535 * value = <string>,
536 * },
537 * {
538 * key = "timer-us",
539 * value = <integer>,
540 * },
541 * {
542 * key = "stream-count",
543 * value = <integer>,
544 * },
545 * {
546 * key = "client-count",
547 * value = <integer>,
548 * },
549 * },
550 * }
551 * }
552 */
553
554 BT_HIDDEN
555 bt_component_class_query_method_status live_viewer_connection_list_sessions(
556 struct live_viewer_connection *viewer_connection,
557 const bt_value **user_result)
558 {
559 bt_component_class_query_method_status status =
560 BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_OK;
561 bt_value *result = NULL;
562 struct lttng_viewer_cmd cmd;
563 struct lttng_viewer_list_sessions list;
564 uint32_t i, sessions_count;
565 ssize_t ret_len;
566
567 result = bt_value_array_create();
568 if (!result) {
569 BT_COMP_LOGE("Error creating array");
570 status = BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_MEMORY_ERROR;
571 goto error;
572 }
573
574 cmd.cmd = htobe32(LTTNG_VIEWER_LIST_SESSIONS);
575 cmd.data_size = htobe64((uint64_t) 0);
576 cmd.cmd_version = htobe32(0);
577
578 ret_len = lttng_live_send(viewer_connection, &cmd, sizeof(cmd));
579 if (ret_len == BT_SOCKET_ERROR) {
580 BT_COMP_LOGE("Error sending cmd: %s", bt_socket_errormsg());
581 status = BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_ERROR;
582 goto error;
583 }
584 BT_ASSERT(ret_len == sizeof(cmd));
585
586 ret_len = lttng_live_recv(viewer_connection, &list, sizeof(list));
587 if (ret_len == 0) {
588 BT_COMP_LOGI("Remote side has closed connection");
589 status = BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_ERROR;
590 goto error;
591 }
592 if (ret_len == BT_SOCKET_ERROR) {
593 BT_COMP_LOGE("Error receiving session list: %s", bt_socket_errormsg());
594 status = BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_ERROR;
595 goto error;
596 }
597 BT_ASSERT(ret_len == sizeof(list));
598
599 sessions_count = be32toh(list.sessions_count);
600 for (i = 0; i < sessions_count; i++) {
601 struct lttng_viewer_session lsession;
602
603 ret_len = lttng_live_recv(viewer_connection, &lsession,
604 sizeof(lsession));
605 if (ret_len == 0) {
606 BT_COMP_LOGI("Remote side has closed connection");
607 status = BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_ERROR;
608 goto error;
609 }
610 if (ret_len == BT_SOCKET_ERROR) {
611 BT_COMP_LOGE("Error receiving session: %s", bt_socket_errormsg());
612 status = BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_ERROR;
613 goto error;
614 }
615 BT_ASSERT(ret_len == sizeof(lsession));
616 lsession.hostname[LTTNG_VIEWER_HOST_NAME_MAX - 1] = '\0';
617 lsession.session_name[LTTNG_VIEWER_NAME_MAX - 1] = '\0';
618 if (list_append_session(result, viewer_connection->url,
619 &lsession, viewer_connection)) {
620 status = BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_ERROR;
621 goto error;
622 }
623 }
624
625 *user_result = result;
626 goto end;
627 error:
628 BT_VALUE_PUT_REF_AND_RESET(result);
629 end:
630 return status;
631 }
632
633 static
634 int lttng_live_query_session_ids(struct lttng_live_msg_iter *lttng_live_msg_iter)
635 {
636 struct lttng_viewer_cmd cmd;
637 struct lttng_viewer_list_sessions list;
638 struct lttng_viewer_session lsession;
639 uint32_t i, sessions_count;
640 ssize_t ret_len;
641 uint64_t session_id;
642 struct live_viewer_connection *viewer_connection =
643 lttng_live_msg_iter->viewer_connection;
644
645 cmd.cmd = htobe32(LTTNG_VIEWER_LIST_SESSIONS);
646 cmd.data_size = htobe64((uint64_t) 0);
647 cmd.cmd_version = htobe32(0);
648
649 ret_len = lttng_live_send(viewer_connection, &cmd, sizeof(cmd));
650 if (ret_len == BT_SOCKET_ERROR) {
651 BT_COMP_LOGE("Error sending cmd: %s", bt_socket_errormsg());
652 goto error;
653 }
654 BT_ASSERT(ret_len == sizeof(cmd));
655
656 ret_len = lttng_live_recv(viewer_connection, &list, sizeof(list));
657 if (ret_len == 0) {
658 BT_COMP_LOGI("Remote side has closed connection");
659 goto error;
660 }
661 if (ret_len == BT_SOCKET_ERROR) {
662 BT_COMP_LOGE("Error receiving session list: %s", bt_socket_errormsg());
663 goto error;
664 }
665 BT_ASSERT(ret_len == sizeof(list));
666
667 sessions_count = be32toh(list.sessions_count);
668 for (i = 0; i < sessions_count; i++) {
669 ret_len = lttng_live_recv(viewer_connection,
670 &lsession, sizeof(lsession));
671 if (ret_len == 0) {
672 BT_COMP_LOGI("Remote side has closed connection");
673 goto error;
674 }
675 if (ret_len == BT_SOCKET_ERROR) {
676 BT_COMP_LOGE("Error receiving session: %s", bt_socket_errormsg());
677 goto error;
678 }
679 BT_ASSERT(ret_len == sizeof(lsession));
680 lsession.hostname[LTTNG_VIEWER_HOST_NAME_MAX - 1] = '\0';
681 lsession.session_name[LTTNG_VIEWER_NAME_MAX - 1] = '\0';
682 session_id = be64toh(lsession.id);
683
684 BT_COMP_LOGI("Adding session %" PRIu64 " hostname: %s session_name: %s",
685 session_id, lsession.hostname, lsession.session_name);
686
687 if ((strncmp(lsession.session_name,
688 viewer_connection->session_name->str,
689 LTTNG_VIEWER_NAME_MAX) == 0) && (strncmp(lsession.hostname,
690 viewer_connection->target_hostname->str,
691 LTTNG_VIEWER_HOST_NAME_MAX) == 0)) {
692 if (lttng_live_add_session(lttng_live_msg_iter, session_id,
693 lsession.hostname,
694 lsession.session_name)) {
695 goto error;
696 }
697 }
698 }
699
700 return 0;
701
702 error:
703 BT_COMP_LOGE("Unable to query session ids");
704 return -1;
705 }
706
707 BT_HIDDEN
708 int lttng_live_create_viewer_session(
709 struct lttng_live_msg_iter *lttng_live_msg_iter)
710 {
711 struct lttng_viewer_cmd cmd;
712 struct lttng_viewer_create_session_response resp;
713 ssize_t ret_len;
714 struct live_viewer_connection *viewer_connection =
715 lttng_live_msg_iter->viewer_connection;
716
717 cmd.cmd = htobe32(LTTNG_VIEWER_CREATE_SESSION);
718 cmd.data_size = htobe64((uint64_t) 0);
719 cmd.cmd_version = htobe32(0);
720
721 ret_len = lttng_live_send(viewer_connection, &cmd, sizeof(cmd));
722 if (ret_len == BT_SOCKET_ERROR) {
723 BT_COMP_LOGE("Error sending cmd: %s", bt_socket_errormsg());
724 goto error;
725 }
726 BT_ASSERT(ret_len == sizeof(cmd));
727
728 ret_len = lttng_live_recv(viewer_connection, &resp, sizeof(resp));
729 if (ret_len == 0) {
730 BT_COMP_LOGI("Remote side has closed connection");
731 goto error;
732 }
733 if (ret_len == BT_SOCKET_ERROR) {
734 BT_COMP_LOGE("Error receiving create session reply: %s", bt_socket_errormsg());
735 goto error;
736 }
737 BT_ASSERT(ret_len == sizeof(resp));
738
739 if (be32toh(resp.status) != LTTNG_VIEWER_CREATE_SESSION_OK) {
740 BT_COMP_LOGE("Error creating viewer session");
741 goto error;
742 }
743 if (lttng_live_query_session_ids(lttng_live_msg_iter)) {
744 goto error;
745 }
746
747 return 0;
748
749 error:
750 return -1;
751 }
752
753 static
754 int receive_streams(struct lttng_live_session *session,
755 uint32_t stream_count)
756 {
757 ssize_t ret_len;
758 uint32_t i;
759 struct lttng_live_msg_iter *lttng_live_msg_iter =
760 session->lttng_live_msg_iter;
761 struct live_viewer_connection *viewer_connection =
762 lttng_live_msg_iter->viewer_connection;
763
764 BT_COMP_LOGI("Getting %" PRIu32 " new streams:", stream_count);
765 for (i = 0; i < stream_count; i++) {
766 struct lttng_viewer_stream stream;
767 struct lttng_live_stream_iterator *live_stream;
768 uint64_t stream_id;
769 uint64_t ctf_trace_id;
770
771 ret_len = lttng_live_recv(viewer_connection, &stream, sizeof(stream));
772 if (ret_len == 0) {
773 BT_COMP_LOGI("Remote side has closed connection");
774 goto error;
775 }
776 if (ret_len == BT_SOCKET_ERROR) {
777 BT_COMP_LOGE("Error receiving stream");
778 goto error;
779 }
780 BT_ASSERT(ret_len == sizeof(stream));
781 stream.path_name[LTTNG_VIEWER_PATH_MAX - 1] = '\0';
782 stream.channel_name[LTTNG_VIEWER_NAME_MAX - 1] = '\0';
783 stream_id = be64toh(stream.id);
784 ctf_trace_id = be64toh(stream.ctf_trace_id);
785
786 if (stream.metadata_flag) {
787 BT_COMP_LOGI(" metadata stream %" PRIu64 " : %s/%s",
788 stream_id, stream.path_name, stream.channel_name);
789 if (lttng_live_metadata_create_stream(session,
790 ctf_trace_id, stream_id,
791 stream.path_name)) {
792 BT_COMP_LOGE("Error creating metadata stream");
793
794 goto error;
795 }
796 session->lazy_stream_msg_init = true;
797 } else {
798 BT_COMP_LOGI(" stream %" PRIu64 " : %s/%s",
799 stream_id, stream.path_name, stream.channel_name);
800 live_stream = lttng_live_stream_iterator_create(session,
801 ctf_trace_id, stream_id);
802 if (!live_stream) {
803 BT_COMP_LOGE("Error creating streamn");
804 goto error;
805 }
806 }
807 }
808 return 0;
809
810 error:
811 return -1;
812 }
813
814 BT_HIDDEN
815 int lttng_live_attach_session(struct lttng_live_session *session)
816 {
817 struct lttng_viewer_cmd cmd;
818 struct lttng_viewer_attach_session_request rq;
819 struct lttng_viewer_attach_session_response rp;
820 struct lttng_live_msg_iter *lttng_live_msg_iter =
821 session->lttng_live_msg_iter;
822 struct live_viewer_connection *viewer_connection =
823 lttng_live_msg_iter->viewer_connection;
824 uint64_t session_id = session->id;
825 uint32_t streams_count;
826 const size_t cmd_buf_len = sizeof(cmd) + sizeof(rq);
827 char cmd_buf[cmd_buf_len];
828 ssize_t ret_len;
829
830 cmd.cmd = htobe32(LTTNG_VIEWER_ATTACH_SESSION);
831 cmd.data_size = htobe64((uint64_t) sizeof(rq));
832 cmd.cmd_version = htobe32(0);
833
834 memset(&rq, 0, sizeof(rq));
835 rq.session_id = htobe64(session_id);
836 // TODO: add cmd line parameter to select seek beginning
837 // rq.seek = htobe32(LTTNG_VIEWER_SEEK_BEGINNING);
838 rq.seek = htobe32(LTTNG_VIEWER_SEEK_LAST);
839
840 /*
841 * Merge the cmd and connection request to prevent a write-write
842 * sequence on the TCP socket. Otherwise, a delayed ACK will prevent the
843 * second write to be performed quickly in presence of Nagle's algorithm.
844 */
845 memcpy(cmd_buf, &cmd, sizeof(cmd));
846 memcpy(cmd_buf + sizeof(cmd), &rq, sizeof(rq));
847 ret_len = lttng_live_send(viewer_connection, &cmd_buf, cmd_buf_len);
848 if (ret_len == BT_SOCKET_ERROR) {
849 BT_COMP_LOGE("Error sending attach request: %s", bt_socket_errormsg());
850 goto error;
851 }
852
853 BT_ASSERT(ret_len == cmd_buf_len);
854 ret_len = lttng_live_recv(viewer_connection, &rp, sizeof(rp));
855 if (ret_len == 0) {
856 BT_COMP_LOGI("Remote side has closed connection");
857 goto error;
858 }
859 if (ret_len == BT_SOCKET_ERROR) {
860 BT_COMP_LOGE("Error receiving attach response: %s", bt_socket_errormsg());
861 goto error;
862 }
863 BT_ASSERT(ret_len == sizeof(rp));
864
865 streams_count = be32toh(rp.streams_count);
866 switch(be32toh(rp.status)) {
867 case LTTNG_VIEWER_ATTACH_OK:
868 break;
869 case LTTNG_VIEWER_ATTACH_UNK:
870 BT_COMP_LOGW("Session id %" PRIu64 " is unknown", session_id);
871 goto error;
872 case LTTNG_VIEWER_ATTACH_ALREADY:
873 BT_COMP_LOGW("There is already a viewer attached to this session");
874 goto error;
875 case LTTNG_VIEWER_ATTACH_NOT_LIVE:
876 BT_COMP_LOGW("Not a live session");
877 goto error;
878 case LTTNG_VIEWER_ATTACH_SEEK_ERR:
879 BT_COMP_LOGE("Wrong seek parameter");
880 goto error;
881 default:
882 BT_COMP_LOGE("Unknown attach return code %u", be32toh(rp.status));
883 goto error;
884 }
885
886 /* We receive the initial list of streams. */
887 if (receive_streams(session, streams_count)) {
888 goto error;
889 }
890
891 session->attached = true;
892 session->new_streams_needed = false;
893
894 return 0;
895
896 error:
897 return -1;
898 }
899
900 BT_HIDDEN
901 int lttng_live_detach_session(struct lttng_live_session *session)
902 {
903 struct lttng_viewer_cmd cmd;
904 struct lttng_viewer_detach_session_request rq;
905 struct lttng_viewer_detach_session_response rp;
906 ssize_t ret_len;
907 struct lttng_live_msg_iter *lttng_live_msg_iter =
908 session->lttng_live_msg_iter;
909 struct live_viewer_connection *viewer_connection =
910 lttng_live_msg_iter->viewer_connection;
911 uint64_t session_id = session->id;
912 const size_t cmd_buf_len = sizeof(cmd) + sizeof(rq);
913 char cmd_buf[cmd_buf_len];
914
915 if (!session->attached) {
916 return 0;
917 }
918
919 cmd.cmd = htobe32(LTTNG_VIEWER_DETACH_SESSION);
920 cmd.data_size = htobe64((uint64_t) sizeof(rq));
921 cmd.cmd_version = htobe32(0);
922
923 memset(&rq, 0, sizeof(rq));
924 rq.session_id = htobe64(session_id);
925
926 /*
927 * Merge the cmd and connection request to prevent a write-write
928 * sequence on the TCP socket. Otherwise, a delayed ACK will prevent the
929 * second write to be performed quickly in presence of Nagle's algorithm.
930 */
931 memcpy(cmd_buf, &cmd, sizeof(cmd));
932 memcpy(cmd_buf + sizeof(cmd), &rq, sizeof(rq));
933 ret_len = lttng_live_send(viewer_connection, &cmd_buf, cmd_buf_len);
934 if (ret_len == BT_SOCKET_ERROR) {
935 BT_COMP_LOGE("Error sending detach request: %s", bt_socket_errormsg());
936 goto error;
937 }
938
939 BT_ASSERT(ret_len == cmd_buf_len);
940 ret_len = lttng_live_recv(viewer_connection, &rp, sizeof(rp));
941 if (ret_len == 0) {
942 BT_COMP_LOGI("Remote side has closed connection");
943 goto error;
944 }
945 if (ret_len == BT_SOCKET_ERROR) {
946 BT_COMP_LOGE("Error receiving detach response: %s", bt_socket_errormsg());
947 goto error;
948 }
949 BT_ASSERT(ret_len == sizeof(rp));
950
951 switch(be32toh(rp.status)) {
952 case LTTNG_VIEWER_DETACH_SESSION_OK:
953 break;
954 case LTTNG_VIEWER_DETACH_SESSION_UNK:
955 BT_COMP_LOGW("Session id %" PRIu64 " is unknown", session_id);
956 goto error;
957 case LTTNG_VIEWER_DETACH_SESSION_ERR:
958 BT_COMP_LOGW("Error detaching session id %" PRIu64 "", session_id);
959 goto error;
960 default:
961 BT_COMP_LOGE("Unknown detach return code %u", be32toh(rp.status));
962 goto error;
963 }
964
965 session->attached = false;
966
967 return 0;
968
969 error:
970 return -1;
971 }
972
973 BT_HIDDEN
974 ssize_t lttng_live_get_one_metadata_packet(struct lttng_live_trace *trace,
975 FILE *fp)
976 {
977 uint64_t len = 0;
978 int ret;
979 struct lttng_viewer_cmd cmd;
980 struct lttng_viewer_get_metadata rq;
981 struct lttng_viewer_metadata_packet rp;
982 char *data = NULL;
983 ssize_t ret_len;
984 struct lttng_live_session *session = trace->session;
985 struct lttng_live_msg_iter *lttng_live_msg_iter =
986 session->lttng_live_msg_iter;
987 struct lttng_live_metadata *metadata = trace->metadata;
988 struct live_viewer_connection *viewer_connection =
989 lttng_live_msg_iter->viewer_connection;
990 const size_t cmd_buf_len = sizeof(cmd) + sizeof(rq);
991 char cmd_buf[cmd_buf_len];
992
993 rq.stream_id = htobe64(metadata->stream_id);
994 cmd.cmd = htobe32(LTTNG_VIEWER_GET_METADATA);
995 cmd.data_size = htobe64((uint64_t) sizeof(rq));
996 cmd.cmd_version = htobe32(0);
997
998 /*
999 * Merge the cmd and connection request to prevent a write-write
1000 * sequence on the TCP socket. Otherwise, a delayed ACK will prevent the
1001 * second write to be performed quickly in presence of Nagle's algorithm.
1002 */
1003 memcpy(cmd_buf, &cmd, sizeof(cmd));
1004 memcpy(cmd_buf + sizeof(cmd), &rq, sizeof(rq));
1005 ret_len = lttng_live_send(viewer_connection, &cmd_buf, cmd_buf_len);
1006 if (ret_len == BT_SOCKET_ERROR) {
1007 BT_COMP_LOGE("Error sending get_metadata request: %s", bt_socket_errormsg());
1008 goto error;
1009 }
1010
1011 BT_ASSERT(ret_len == cmd_buf_len);
1012 ret_len = lttng_live_recv(viewer_connection, &rp, sizeof(rp));
1013 if (ret_len == 0) {
1014 BT_COMP_LOGI("Remote side has closed connection");
1015 goto error;
1016 }
1017 if (ret_len == BT_SOCKET_ERROR) {
1018 BT_COMP_LOGE("Error receiving get_metadata response: %s", bt_socket_errormsg());
1019 goto error;
1020 }
1021 BT_ASSERT(ret_len == sizeof(rp));
1022
1023 switch (be32toh(rp.status)) {
1024 case LTTNG_VIEWER_METADATA_OK:
1025 BT_COMP_LOGD("get_metadata : OK");
1026 break;
1027 case LTTNG_VIEWER_NO_NEW_METADATA:
1028 BT_COMP_LOGD("get_metadata : NO NEW");
1029 ret = 0;
1030 goto end;
1031 case LTTNG_VIEWER_METADATA_ERR:
1032 BT_COMP_LOGD("get_metadata : ERR");
1033 goto error;
1034 default:
1035 BT_COMP_LOGD("get_metadata : UNKNOWN");
1036 goto error;
1037 }
1038
1039 len = be64toh(rp.len);
1040 BT_COMP_LOGD("Writing %" PRIu64" bytes to metadata", len);
1041 if (len <= 0) {
1042 goto error;
1043 }
1044
1045 data = calloc(1, len);
1046 if (!data) {
1047 BT_COMP_LOGE("relay data calloc: %s", strerror(errno));
1048 goto error;
1049 }
1050 ret_len = lttng_live_recv(viewer_connection, data, len);
1051 if (ret_len == 0) {
1052 BT_COMP_LOGI("Remote side has closed connection");
1053 goto error_free_data;
1054 }
1055 if (ret_len == BT_SOCKET_ERROR) {
1056 BT_COMP_LOGE("Error receiving trace packet: %s", bt_socket_errormsg());
1057 goto error_free_data;
1058 }
1059 BT_ASSERT(ret_len == len);
1060
1061 do {
1062 ret_len = fwrite(data, 1, len, fp);
1063 } while (ret_len < 0 && errno == EINTR);
1064 if (ret_len < 0) {
1065 BT_COMP_LOGE("Writing in the metadata fp");
1066 goto error_free_data;
1067 }
1068 BT_ASSERT(ret_len == len);
1069 free(data);
1070 ret = len;
1071 end:
1072 return ret;
1073
1074 error_free_data:
1075 free(data);
1076 error:
1077 return -1;
1078 }
1079
1080 /*
1081 * Assign the fields from a lttng_viewer_index to a packet_index.
1082 */
1083 static
1084 void lttng_index_to_packet_index(struct lttng_viewer_index *lindex,
1085 struct packet_index *pindex)
1086 {
1087 BT_ASSERT(lindex);
1088 BT_ASSERT(pindex);
1089
1090 pindex->offset = be64toh(lindex->offset);
1091 pindex->packet_size = be64toh(lindex->packet_size);
1092 pindex->content_size = be64toh(lindex->content_size);
1093 pindex->ts_cycles.timestamp_begin = be64toh(lindex->timestamp_begin);
1094 pindex->ts_cycles.timestamp_end = be64toh(lindex->timestamp_end);
1095 pindex->events_discarded = be64toh(lindex->events_discarded);
1096 }
1097
1098 BT_HIDDEN
1099 enum lttng_live_iterator_status lttng_live_get_next_index(
1100 struct lttng_live_msg_iter *lttng_live_msg_iter,
1101 struct lttng_live_stream_iterator *stream,
1102 struct packet_index *index)
1103 {
1104 struct lttng_viewer_cmd cmd;
1105 struct lttng_viewer_get_next_index rq;
1106 struct lttng_viewer_index rp;
1107 enum lttng_live_iterator_status retstatus = LTTNG_LIVE_ITERATOR_STATUS_OK;
1108 struct live_viewer_connection *viewer_connection =
1109 lttng_live_msg_iter->viewer_connection;
1110 struct lttng_live_trace *trace = stream->trace;
1111 const size_t cmd_buf_len = sizeof(cmd) + sizeof(rq);
1112 char cmd_buf[cmd_buf_len];
1113 uint32_t flags, status;
1114 ssize_t ret_len;
1115
1116 cmd.cmd = htobe32(LTTNG_VIEWER_GET_NEXT_INDEX);
1117 cmd.data_size = htobe64((uint64_t) sizeof(rq));
1118 cmd.cmd_version = htobe32(0);
1119
1120
1121 memset(&rq, 0, sizeof(rq));
1122 rq.stream_id = htobe64(stream->viewer_stream_id);
1123
1124 /*
1125 * Merge the cmd and connection request to prevent a write-write
1126 * sequence on the TCP socket. Otherwise, a delayed ACK will prevent the
1127 * second write to be performed quickly in presence of Nagle's algorithm.
1128 */
1129 memcpy(cmd_buf, &cmd, sizeof(cmd));
1130 memcpy(cmd_buf + sizeof(cmd), &rq, sizeof(rq));
1131 ret_len = lttng_live_send(viewer_connection, &cmd_buf, cmd_buf_len);
1132 if (ret_len == BT_SOCKET_ERROR) {
1133 BT_COMP_LOGE("Error sending get_next_index request: %s",
1134 bt_socket_errormsg());
1135 goto error;
1136 }
1137
1138 BT_ASSERT(ret_len == cmd_buf_len);
1139 ret_len = lttng_live_recv(viewer_connection, &rp, sizeof(rp));
1140 if (ret_len == 0) {
1141 BT_COMP_LOGI("Remote side has closed connection");
1142 goto error;
1143 }
1144 if (ret_len == BT_SOCKET_ERROR) {
1145 BT_COMP_LOGE("Error receiving get_next_index response: %s",
1146 bt_socket_errormsg());
1147 goto error;
1148 }
1149 BT_ASSERT(ret_len == sizeof(rp));
1150
1151 flags = be32toh(rp.flags);
1152 status = be32toh(rp.status);
1153
1154 switch (status) {
1155 case LTTNG_VIEWER_INDEX_INACTIVE:
1156 {
1157 uint64_t ctf_stream_class_id;
1158
1159 BT_COMP_LOGD("get_next_index: inactive");
1160 memset(index, 0, sizeof(struct packet_index));
1161 index->ts_cycles.timestamp_end = be64toh(rp.timestamp_end);
1162 stream->current_inactivity_ts = index->ts_cycles.timestamp_end;
1163 ctf_stream_class_id = be64toh(rp.stream_id);
1164 if (stream->ctf_stream_class_id != -1ULL) {
1165 BT_ASSERT(stream->ctf_stream_class_id ==
1166 ctf_stream_class_id);
1167 } else {
1168 stream->ctf_stream_class_id = ctf_stream_class_id;
1169 }
1170 stream->state = LTTNG_LIVE_STREAM_QUIESCENT;
1171 break;
1172 }
1173 case LTTNG_VIEWER_INDEX_OK:
1174 {
1175 uint64_t ctf_stream_class_id;
1176
1177 BT_COMP_LOGD("get_next_index: OK");
1178 lttng_index_to_packet_index(&rp, index);
1179 ctf_stream_class_id = be64toh(rp.stream_id);
1180 if (stream->ctf_stream_class_id != -1ULL) {
1181 BT_ASSERT(stream->ctf_stream_class_id ==
1182 ctf_stream_class_id);
1183 } else {
1184 stream->ctf_stream_class_id = ctf_stream_class_id;
1185 }
1186
1187 stream->state = LTTNG_LIVE_STREAM_ACTIVE_DATA;
1188
1189 if (flags & LTTNG_VIEWER_FLAG_NEW_METADATA) {
1190 BT_COMP_LOGD("get_next_index: new metadata needed");
1191 trace->new_metadata_needed = true;
1192 }
1193 if (flags & LTTNG_VIEWER_FLAG_NEW_STREAM) {
1194 BT_COMP_LOGD("get_next_index: new streams needed");
1195 lttng_live_need_new_streams(lttng_live_msg_iter);
1196 }
1197 break;
1198 }
1199 case LTTNG_VIEWER_INDEX_RETRY:
1200 BT_COMP_LOGD("get_next_index: retry");
1201 memset(index, 0, sizeof(struct packet_index));
1202 retstatus = LTTNG_LIVE_ITERATOR_STATUS_AGAIN;
1203 stream->state = LTTNG_LIVE_STREAM_ACTIVE_NO_DATA;
1204 goto end;
1205 case LTTNG_VIEWER_INDEX_HUP:
1206 BT_COMP_LOGD("get_next_index: stream hung up");
1207 memset(index, 0, sizeof(struct packet_index));
1208 index->offset = EOF;
1209 retstatus = LTTNG_LIVE_ITERATOR_STATUS_END;
1210 stream->state = LTTNG_LIVE_STREAM_EOF;
1211 stream->has_stream_hung_up = true;
1212 break;
1213 case LTTNG_VIEWER_INDEX_ERR:
1214 BT_COMP_LOGE("get_next_index: error");
1215 memset(index, 0, sizeof(struct packet_index));
1216 stream->state = LTTNG_LIVE_STREAM_ACTIVE_NO_DATA;
1217 goto error;
1218 default:
1219 BT_COMP_LOGE("get_next_index: unknown value");
1220 memset(index, 0, sizeof(struct packet_index));
1221 stream->state = LTTNG_LIVE_STREAM_ACTIVE_NO_DATA;
1222 goto error;
1223 }
1224 end:
1225 return retstatus;
1226
1227 error:
1228 if (lttng_live_graph_is_canceled(lttng_live_msg_iter)) {
1229 retstatus = LTTNG_LIVE_ITERATOR_STATUS_AGAIN;
1230 } else {
1231 retstatus = LTTNG_LIVE_ITERATOR_STATUS_ERROR;
1232 }
1233 return retstatus;
1234 }
1235
1236 BT_HIDDEN
1237 enum bt_msg_iter_medium_status lttng_live_get_stream_bytes(
1238 struct lttng_live_msg_iter *lttng_live_msg_iter,
1239 struct lttng_live_stream_iterator *stream, uint8_t *buf,
1240 uint64_t offset, uint64_t req_len, uint64_t *recv_len)
1241 {
1242 enum bt_msg_iter_medium_status retstatus = BT_MSG_ITER_MEDIUM_STATUS_OK;
1243 struct lttng_viewer_trace_packet rp;
1244 struct lttng_viewer_cmd cmd;
1245 struct lttng_viewer_get_packet rq;
1246 struct live_viewer_connection *viewer_connection =
1247 lttng_live_msg_iter->viewer_connection;
1248 struct lttng_live_trace *trace = stream->trace;
1249 const size_t cmd_buf_len = sizeof(cmd) + sizeof(rq);
1250 char cmd_buf[cmd_buf_len];
1251 uint32_t flags, status;
1252 ssize_t ret_len;
1253
1254 BT_COMP_LOGD("lttng_live_get_stream_bytes: offset=%" PRIu64 ", req_len=%" PRIu64,
1255 offset, req_len);
1256 cmd.cmd = htobe32(LTTNG_VIEWER_GET_PACKET);
1257 cmd.data_size = htobe64((uint64_t) sizeof(rq));
1258 cmd.cmd_version = htobe32(0);
1259
1260 memset(&rq, 0, sizeof(rq));
1261 rq.stream_id = htobe64(stream->viewer_stream_id);
1262 rq.offset = htobe64(offset);
1263 rq.len = htobe32(req_len);
1264
1265 /*
1266 * Merge the cmd and connection request to prevent a write-write
1267 * sequence on the TCP socket. Otherwise, a delayed ACK will prevent the
1268 * second write to be performed quickly in presence of Nagle's algorithm.
1269 */
1270 memcpy(cmd_buf, &cmd, sizeof(cmd));
1271 memcpy(cmd_buf + sizeof(cmd), &rq, sizeof(rq));
1272 ret_len = lttng_live_send(viewer_connection, &cmd_buf, cmd_buf_len);
1273 if (ret_len == BT_SOCKET_ERROR) {
1274 BT_COMP_LOGE("Error sending get_data request: %s", bt_socket_errormsg());
1275 goto error;
1276 }
1277
1278 BT_ASSERT(ret_len == cmd_buf_len);
1279 ret_len = lttng_live_recv(viewer_connection, &rp, sizeof(rp));
1280 if (ret_len == 0) {
1281 BT_COMP_LOGI("Remote side has closed connection");
1282 goto error;
1283 }
1284 if (ret_len == BT_SOCKET_ERROR) {
1285 BT_COMP_LOGE("Error receiving get_data response: %s", bt_socket_errormsg());
1286 goto error;
1287 }
1288 if (ret_len != sizeof(rp)) {
1289 BT_COMP_LOGE("get_data_packet: expected %zu"
1290 ", received %zd", sizeof(rp),
1291 ret_len);
1292 goto error;
1293 }
1294
1295 flags = be32toh(rp.flags);
1296 status = be32toh(rp.status);
1297
1298 switch (status) {
1299 case LTTNG_VIEWER_GET_PACKET_OK:
1300 req_len = be32toh(rp.len);
1301 BT_COMP_LOGD("get_data_packet: Ok, packet size : %" PRIu64 "", req_len);
1302 break;
1303 case LTTNG_VIEWER_GET_PACKET_RETRY:
1304 /* Unimplemented by relay daemon */
1305 BT_COMP_LOGD("get_data_packet: retry");
1306 retstatus = BT_MSG_ITER_MEDIUM_STATUS_AGAIN;
1307 goto end;
1308 case LTTNG_VIEWER_GET_PACKET_ERR:
1309 if (flags & LTTNG_VIEWER_FLAG_NEW_METADATA) {
1310 BT_COMP_LOGD("get_data_packet: new metadata needed, try again later");
1311 trace->new_metadata_needed = true;
1312 }
1313 if (flags & LTTNG_VIEWER_FLAG_NEW_STREAM) {
1314 BT_COMP_LOGD("get_data_packet: new streams needed, try again later");
1315 lttng_live_need_new_streams(lttng_live_msg_iter);
1316 }
1317 if (flags & (LTTNG_VIEWER_FLAG_NEW_METADATA
1318 | LTTNG_VIEWER_FLAG_NEW_STREAM)) {
1319 retstatus = BT_MSG_ITER_MEDIUM_STATUS_AGAIN;
1320 goto end;
1321 }
1322 BT_COMP_LOGE("get_data_packet: error");
1323 goto error;
1324 case LTTNG_VIEWER_GET_PACKET_EOF:
1325 retstatus = BT_MSG_ITER_MEDIUM_STATUS_EOF;
1326 goto end;
1327 default:
1328 BT_COMP_LOGE("get_data_packet: unknown");
1329 goto error;
1330 }
1331
1332 if (req_len == 0) {
1333 goto error;
1334 }
1335
1336 ret_len = lttng_live_recv(viewer_connection, buf, req_len);
1337 if (ret_len == 0) {
1338 BT_COMP_LOGI("Remote side has closed connection");
1339 goto error;
1340 }
1341 if (ret_len == BT_SOCKET_ERROR) {
1342 BT_COMP_LOGE("Error receiving trace packet: %s", bt_socket_errormsg());
1343 goto error;
1344 }
1345 BT_ASSERT(ret_len == req_len);
1346 *recv_len = ret_len;
1347 end:
1348 return retstatus;
1349
1350 error:
1351 if (lttng_live_graph_is_canceled(lttng_live_msg_iter)) {
1352 retstatus = BT_MSG_ITER_MEDIUM_STATUS_AGAIN;
1353 } else {
1354 retstatus = BT_MSG_ITER_MEDIUM_STATUS_ERROR;
1355 }
1356 return retstatus;
1357 }
1358
1359 /*
1360 * Request new streams for a session.
1361 */
1362 BT_HIDDEN
1363 enum lttng_live_iterator_status lttng_live_get_new_streams(
1364 struct lttng_live_session *session)
1365 {
1366 enum lttng_live_iterator_status status =
1367 LTTNG_LIVE_ITERATOR_STATUS_OK;
1368 struct lttng_viewer_cmd cmd;
1369 struct lttng_viewer_new_streams_request rq;
1370 struct lttng_viewer_new_streams_response rp;
1371 struct lttng_live_msg_iter *lttng_live_msg_iter =
1372 session->lttng_live_msg_iter;
1373 struct live_viewer_connection *viewer_connection =
1374 lttng_live_msg_iter->viewer_connection;
1375 uint32_t streams_count;
1376 const size_t cmd_buf_len = sizeof(cmd) + sizeof(rq);
1377 char cmd_buf[cmd_buf_len];
1378 ssize_t ret_len;
1379
1380 if (!session->new_streams_needed) {
1381 return LTTNG_LIVE_ITERATOR_STATUS_OK;
1382 }
1383
1384 cmd.cmd = htobe32(LTTNG_VIEWER_GET_NEW_STREAMS);
1385 cmd.data_size = htobe64((uint64_t) sizeof(rq));
1386 cmd.cmd_version = htobe32(0);
1387
1388 memset(&rq, 0, sizeof(rq));
1389 rq.session_id = htobe64(session->id);
1390
1391 /*
1392 * Merge the cmd and connection request to prevent a write-write
1393 * sequence on the TCP socket. Otherwise, a delayed ACK will prevent the
1394 * second write to be performed quickly in presence of Nagle's algorithm.
1395 */
1396 memcpy(cmd_buf, &cmd, sizeof(cmd));
1397 memcpy(cmd_buf + sizeof(cmd), &rq, sizeof(rq));
1398 ret_len = lttng_live_send(viewer_connection, &cmd_buf, cmd_buf_len);
1399 if (ret_len == BT_SOCKET_ERROR) {
1400 BT_COMP_LOGE("Error sending get_new_streams request: %s",
1401 bt_socket_errormsg());
1402 goto error;
1403 }
1404
1405 BT_ASSERT(ret_len == cmd_buf_len);
1406 ret_len = lttng_live_recv(viewer_connection, &rp, sizeof(rp));
1407 if (ret_len == 0) {
1408 BT_COMP_LOGI("Remote side has closed connection");
1409 goto error;
1410 }
1411 if (ret_len == BT_SOCKET_ERROR) {
1412 BT_COMP_LOGE("Error receiving get_new_streams response");
1413 goto error;
1414 }
1415 BT_ASSERT(ret_len == sizeof(rp));
1416
1417 streams_count = be32toh(rp.streams_count);
1418
1419 switch(be32toh(rp.status)) {
1420 case LTTNG_VIEWER_NEW_STREAMS_OK:
1421 session->new_streams_needed = false;
1422 break;
1423 case LTTNG_VIEWER_NEW_STREAMS_NO_NEW:
1424 session->new_streams_needed = false;
1425 goto end;
1426 case LTTNG_VIEWER_NEW_STREAMS_HUP:
1427 session->new_streams_needed = false;
1428 session->closed = true;
1429 status = LTTNG_LIVE_ITERATOR_STATUS_END;
1430 goto end;
1431 case LTTNG_VIEWER_NEW_STREAMS_ERR:
1432 BT_COMP_LOGE("get_new_streams error");
1433 goto error;
1434 default:
1435 BT_COMP_LOGE("Unknown return code %u", be32toh(rp.status));
1436 goto error;
1437 }
1438
1439 if (receive_streams(session, streams_count)) {
1440 goto error;
1441 }
1442 end:
1443 return status;
1444
1445 error:
1446 if (lttng_live_graph_is_canceled(lttng_live_msg_iter)) {
1447 status = LTTNG_LIVE_ITERATOR_STATUS_AGAIN;
1448 } else {
1449 status = LTTNG_LIVE_ITERATOR_STATUS_ERROR;
1450 }
1451 return status;
1452 }
1453
1454 BT_HIDDEN
1455 struct live_viewer_connection *live_viewer_connection_create(
1456 const char *url, bool in_query,
1457 struct lttng_live_msg_iter *lttng_live_msg_iter,
1458 bt_logging_level log_level)
1459 {
1460 struct live_viewer_connection *viewer_connection;
1461
1462 viewer_connection = g_new0(struct live_viewer_connection, 1);
1463
1464 if (bt_socket_init(log_level) != 0) {
1465 goto error;
1466 }
1467
1468 viewer_connection->log_level = log_level;
1469
1470 if (lttng_live_msg_iter) {
1471 viewer_connection->self_comp = lttng_live_msg_iter->self_comp;
1472 }
1473
1474 bt_object_init_shared(&viewer_connection->obj, connection_release);
1475 viewer_connection->control_sock = BT_INVALID_SOCKET;
1476 viewer_connection->port = -1;
1477 viewer_connection->in_query = in_query;
1478 viewer_connection->lttng_live_msg_iter = lttng_live_msg_iter;
1479 viewer_connection->url = g_string_new(url);
1480 if (!viewer_connection->url) {
1481 goto error;
1482 }
1483
1484 BT_COMP_LOGI("Establishing connection to url \"%s\"...", url);
1485 if (lttng_live_connect_viewer(viewer_connection)) {
1486 goto error_report;
1487 }
1488 BT_COMP_LOGI("Connection to url \"%s\" is established", url);
1489 return viewer_connection;
1490
1491 error_report:
1492 BT_COMP_LOGW("Failure to establish connection to url \"%s\"", url);
1493 error:
1494 if (viewer_connection) {
1495 live_viewer_connection_destroy(viewer_connection);
1496 }
1497
1498 return NULL;
1499 }
1500
1501 BT_HIDDEN
1502 void live_viewer_connection_destroy(
1503 struct live_viewer_connection *viewer_connection)
1504 {
1505 BT_COMP_LOGI("Closing connection to url \"%s\"", viewer_connection->url->str);
1506 lttng_live_disconnect_viewer(viewer_connection);
1507 if (viewer_connection->url) {
1508 g_string_free(viewer_connection->url, true);
1509 }
1510 if (viewer_connection->relay_hostname) {
1511 g_string_free(viewer_connection->relay_hostname, true);
1512 }
1513 if (viewer_connection->target_hostname) {
1514 g_string_free(viewer_connection->target_hostname, true);
1515 }
1516 if (viewer_connection->session_name) {
1517 g_string_free(viewer_connection->session_name, true);
1518 }
1519 g_free(viewer_connection);
1520
1521 bt_socket_fini();
1522 }
BabelTrace - Trace Format Babel Tower
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