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Fix: don't access missing ctf trace when getting metadata
[babeltrace.git] / formats / lttng-live / lttng-live-comm.c
1 /*
2 * Copyright (C) 2013 - Julien Desfossez <jdesfossez@efficios.com>
3 * 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 #include <sys/socket.h>
25 #include <sys/types.h>
26 #include <netinet/in.h>
27 #include <netdb.h>
28 #include <stdio.h>
29 #include <stdlib.h>
30 #include <unistd.h>
31 #include <errno.h>
32 #include <inttypes.h>
33 #include <fcntl.h>
34 #include <poll.h>
35
36 #include <babeltrace/ctf/ctf-index.h>
37
38 #include <babeltrace/babeltrace.h>
39 #include <babeltrace/endian.h>
40 #include <babeltrace/ctf/events.h>
41 #include <babeltrace/ctf/callbacks.h>
42 #include <babeltrace/ctf/iterator.h>
43
44 /* for packet_index */
45 #include <babeltrace/ctf/types.h>
46
47 #include <babeltrace/ctf/metadata.h>
48 #include <babeltrace/ctf-text/types.h>
49 #include <babeltrace/ctf/events-internal.h>
50 #include <formats/ctf/events-private.h>
51
52 #include <babeltrace/compat/memstream.h>
53 #include <babeltrace/compat/send.h>
54 #include <babeltrace/compat/string.h>
55 #include <babeltrace/compat/mman.h>
56
57 #include "lttng-live.h"
58 #include "lttng-viewer-abi.h"
59
60 #define ACTIVE_POLL_DELAY 100 /* ms */
61
62 /*
63 * Memory allocation zeroed
64 */
65 #define zmalloc(x) calloc(1, x)
66
67 #ifndef max_t
68 #define max_t(type, a, b) \
69 ((type) (a) > (type) (b) ? (type) (a) : (type) (b))
70 #endif
71
72 static void ctf_live_packet_seek(struct bt_stream_pos *stream_pos,
73 size_t index, int whence);
74 static int add_traces(struct lttng_live_ctx *ctx);
75 static int del_traces(gpointer key, gpointer value, gpointer user_data);
76 static int get_new_metadata(struct lttng_live_ctx *ctx,
77 struct lttng_live_viewer_stream *viewer_stream,
78 char **metadata_buf);
79
80 static
81 ssize_t lttng_live_recv(int fd, void *buf, size_t len)
82 {
83 ssize_t ret;
84 size_t copied = 0, to_copy = len;
85
86 do {
87 ret = recv(fd, buf + copied, to_copy, 0);
88 if (ret > 0) {
89 assert(ret <= to_copy);
90 copied += ret;
91 to_copy -= ret;
92 }
93 } while ((ret > 0 && to_copy > 0)
94 || (ret < 0 && errno == EINTR));
95 if (ret > 0)
96 ret = copied;
97 /* ret = 0 means orderly shutdown, ret < 0 is error. */
98 return ret;
99 }
100
101 static
102 ssize_t lttng_live_send(int fd, const void *buf, size_t len)
103 {
104 ssize_t ret;
105
106 do {
107 ret = bt_send_nosigpipe(fd, buf, len);
108 } while (ret < 0 && errno == EINTR);
109 return ret;
110 }
111
112 int lttng_live_connect_viewer(struct lttng_live_ctx *ctx)
113 {
114 struct hostent *host;
115 struct sockaddr_in server_addr;
116 int ret;
117
118 if (lttng_live_should_quit()) {
119 ret = -1;
120 goto end;
121 }
122
123 host = gethostbyname(ctx->relay_hostname);
124 if (!host) {
125 fprintf(stderr, "[error] Cannot lookup hostname %s\n",
126 ctx->relay_hostname);
127 goto error;
128 }
129
130 if ((ctx->control_sock = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
131 perror("Socket");
132 goto error;
133 }
134
135 server_addr.sin_family = AF_INET;
136 server_addr.sin_port = htons(ctx->port);
137 server_addr.sin_addr = *((struct in_addr *) host->h_addr);
138 memset(&(server_addr.sin_zero), 0, 8);
139
140 if (connect(ctx->control_sock, (struct sockaddr *) &server_addr,
141 sizeof(struct sockaddr)) == -1) {
142 perror("Connect");
143 goto error;
144 }
145
146 ret = 0;
147
148 end:
149 return ret;
150
151 error:
152 fprintf(stderr, "[error] Connection failed\n");
153 return -1;
154 }
155
156 int lttng_live_establish_connection(struct lttng_live_ctx *ctx)
157 {
158 struct lttng_viewer_cmd cmd;
159 struct lttng_viewer_connect connect;
160 const size_t cmd_buf_len = sizeof(cmd) + sizeof(connect);
161 char cmd_buf[cmd_buf_len];
162 int ret;
163 ssize_t ret_len;
164
165 if (lttng_live_should_quit()) {
166 ret = -1;
167 goto end;
168 }
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
187 ret_len = lttng_live_send(ctx->control_sock, cmd_buf, cmd_buf_len);
188 if (ret_len < 0) {
189 perror("[error] Error sending cmd for establishing session");
190 goto error;
191 }
192 assert(ret_len == cmd_buf_len);
193
194 ret_len = lttng_live_recv(ctx->control_sock, &connect, sizeof(connect));
195 if (ret_len == 0) {
196 fprintf(stderr, "[error] Remote side has closed connection\n");
197 goto error;
198 }
199 if (ret_len < 0) {
200 perror("[error] Error receiving version");
201 goto error;
202 }
203 assert(ret_len == sizeof(connect));
204
205 printf_verbose("Received viewer session ID : %" PRIu64 "\n",
206 be64toh(connect.viewer_session_id));
207 printf_verbose("Relayd version : %u.%u\n", be32toh(connect.major),
208 be32toh(connect.minor));
209
210 if (LTTNG_LIVE_MAJOR != be32toh(connect.major)) {
211 fprintf(stderr, "[error] Incompatible lttng-relayd protocol\n");
212 goto error;
213 }
214 /* Use the smallest protocol version implemented. */
215 if (LTTNG_LIVE_MINOR > be32toh(connect.minor)) {
216 ctx->minor = be32toh(connect.minor);
217 } else {
218 ctx->minor = LTTNG_LIVE_MINOR;
219 }
220 ctx->major = LTTNG_LIVE_MAJOR;
221 ret = 0;
222 end:
223 return ret;
224
225 error:
226 fprintf(stderr, "[error] Unable to establish connection\n");
227 return -1;
228 }
229
230 static
231 void free_session_list(GPtrArray *session_list)
232 {
233 int i;
234 struct lttng_live_relay_session *relay_session;
235
236 for (i = 0; i < session_list->len; i++) {
237 relay_session = g_ptr_array_index(session_list, i);
238 free(relay_session->name);
239 free(relay_session->hostname);
240 }
241 g_ptr_array_free(session_list, TRUE);
242 }
243
244 static
245 void print_session_list(GPtrArray *session_list, const char *path)
246 {
247 int i;
248 struct lttng_live_relay_session *relay_session;
249
250 for (i = 0; i < session_list->len; i++) {
251 relay_session = g_ptr_array_index(session_list, i);
252 fprintf(LTTNG_LIVE_OUTPUT_FP, "%s/host/%s/%s (timer = %u, "
253 "%u stream(s), %u client(s) connected)\n",
254 path, relay_session->hostname,
255 relay_session->name, relay_session->timer,
256 relay_session->streams, relay_session->clients);
257 }
258 }
259
260 static
261 void update_session_list(GPtrArray *session_list, char *hostname,
262 char *session_name, uint32_t streams, uint32_t clients,
263 uint32_t timer)
264 {
265 int i, found = 0;
266 struct lttng_live_relay_session *relay_session;
267
268 for (i = 0; i < session_list->len; i++) {
269 relay_session = g_ptr_array_index(session_list, i);
270 if ((strncmp(relay_session->hostname, hostname, MAXNAMLEN) == 0) &&
271 strncmp(relay_session->name,
272 session_name, MAXNAMLEN) == 0) {
273 relay_session->streams += streams;
274 if (relay_session->clients < clients)
275 relay_session->clients = clients;
276 found = 1;
277 break;
278 }
279 }
280 if (found)
281 return;
282
283 relay_session = g_new0(struct lttng_live_relay_session, 1);
284 relay_session->hostname = bt_strndup(hostname, MAXNAMLEN);
285 relay_session->name = bt_strndup(session_name, MAXNAMLEN);
286 relay_session->clients = clients;
287 relay_session->streams = streams;
288 relay_session->timer = timer;
289 g_ptr_array_add(session_list, relay_session);
290 }
291
292 int lttng_live_list_sessions(struct lttng_live_ctx *ctx, const char *path)
293 {
294 struct lttng_viewer_cmd cmd;
295 struct lttng_viewer_list_sessions list;
296 struct lttng_viewer_session lsession;
297 int i, ret, sessions_count, print_list = 0;
298 ssize_t ret_len;
299 uint64_t session_id;
300 GPtrArray *session_list = NULL;
301
302 if (lttng_live_should_quit()) {
303 ret = -1;
304 goto end;
305 }
306
307 if (strlen(ctx->session_name) == 0) {
308 print_list = 1;
309 session_list = g_ptr_array_new();
310 }
311
312 cmd.cmd = htobe32(LTTNG_VIEWER_LIST_SESSIONS);
313 cmd.data_size = htobe64((uint64_t) 0);
314 cmd.cmd_version = htobe32(0);
315
316 ret_len = lttng_live_send(ctx->control_sock, &cmd, sizeof(cmd));
317 if (ret_len < 0) {
318 perror("[error] Error sending cmd");
319 goto error;
320 }
321 assert(ret_len == sizeof(cmd));
322
323 ret_len = lttng_live_recv(ctx->control_sock, &list, sizeof(list));
324 if (ret_len == 0) {
325 fprintf(stderr, "[error] Remote side has closed connection\n");
326 goto error;
327 }
328 if (ret_len < 0) {
329 perror("[error] Error receiving session list");
330 goto error;
331 }
332 assert(ret_len == sizeof(list));
333
334 sessions_count = be32toh(list.sessions_count);
335 for (i = 0; i < sessions_count; i++) {
336 ret_len = lttng_live_recv(ctx->control_sock, &lsession, sizeof(lsession));
337 if (ret_len == 0) {
338 fprintf(stderr, "[error] Remote side has closed connection\n");
339 goto error;
340 }
341 if (ret_len < 0) {
342 perror("[error] Error receiving session");
343 goto error;
344 }
345 assert(ret_len == sizeof(lsession));
346 lsession.hostname[LTTNG_VIEWER_HOST_NAME_MAX - 1] = '\0';
347 lsession.session_name[LTTNG_VIEWER_NAME_MAX - 1] = '\0';
348 session_id = be64toh(lsession.id);
349
350 if (print_list) {
351 update_session_list(session_list,
352 lsession.hostname,
353 lsession.session_name,
354 be32toh(lsession.streams),
355 be32toh(lsession.clients),
356 be32toh(lsession.live_timer));
357 } else {
358 if ((strncmp(lsession.session_name, ctx->session_name,
359 MAXNAMLEN) == 0) && (strncmp(lsession.hostname,
360 ctx->traced_hostname, MAXNAMLEN) == 0)) {
361 printf_verbose("Reading from session %" PRIu64 "\n",
362 session_id);
363 g_array_append_val(ctx->session_ids,
364 session_id);
365 }
366 }
367 }
368
369 if (print_list) {
370 print_session_list(session_list, path);
371 free_session_list(session_list);
372 }
373 ret = 0;
374 end:
375 return ret;
376
377 error:
378 fprintf(stderr, "[error] Unable to list sessions\n");
379 return -1;
380 }
381
382 int lttng_live_ctf_trace_assign(struct lttng_live_viewer_stream *stream,
383 uint64_t ctf_trace_id)
384 {
385 struct lttng_live_ctf_trace *trace;
386 int ret = 0;
387
388 trace = g_hash_table_lookup(stream->session->ctf_traces,
389 &ctf_trace_id);
390 if (!trace) {
391 trace = g_new0(struct lttng_live_ctf_trace, 1);
392 trace->ctf_trace_id = ctf_trace_id;
393 trace->streams = g_ptr_array_new();
394 g_hash_table_insert(stream->session->ctf_traces,
395 &trace->ctf_trace_id,
396 trace);
397 }
398 if (stream->metadata_flag)
399 trace->metadata_stream = stream;
400
401 stream->ctf_trace = trace;
402 g_ptr_array_add(trace->streams, stream);
403
404 return ret;
405 }
406
407 static
408 int open_metadata_fp_write(struct lttng_live_viewer_stream *stream,
409 char **metadata_buf, size_t *size)
410 {
411 int ret = 0;
412
413 stream->metadata_fp_write =
414 babeltrace_open_memstream(metadata_buf, size);
415 if (!stream->metadata_fp_write) {
416 perror("Metadata open_memstream");
417 ret = -1;
418 }
419
420 return ret;
421 }
422
423 int lttng_live_attach_session(struct lttng_live_ctx *ctx, uint64_t id)
424 {
425 struct lttng_viewer_cmd cmd;
426 struct lttng_viewer_attach_session_request rq;
427 struct lttng_viewer_attach_session_response rp;
428 struct lttng_viewer_stream stream;
429 const size_t cmd_buf_len = sizeof(cmd) + sizeof(rq);
430 char cmd_buf[cmd_buf_len];
431 int ret, i;
432 ssize_t ret_len;
433
434 if (lttng_live_should_quit()) {
435 ret = -1;
436 goto end;
437 }
438
439 cmd.cmd = htobe32(LTTNG_VIEWER_ATTACH_SESSION);
440 cmd.data_size = htobe64((uint64_t) sizeof(rq));
441 cmd.cmd_version = htobe32(0);
442
443 memset(&rq, 0, sizeof(rq));
444 rq.session_id = htobe64(id);
445 // TODO: add cmd line parameter to select seek beginning
446 // rq.seek = htobe32(LTTNG_VIEWER_SEEK_BEGINNING);
447 rq.seek = htobe32(LTTNG_VIEWER_SEEK_LAST);
448
449 /*
450 * Merge the cmd and connection request to prevent a write-write
451 * sequence on the TCP socket. Otherwise, a delayed ACK will prevent the
452 * second write to be performed quickly in presence of Nagle's algorithm.
453 */
454 memcpy(cmd_buf, &cmd, sizeof(cmd));
455 memcpy(cmd_buf + sizeof(cmd), &rq, sizeof(rq));
456
457 ret_len = lttng_live_send(ctx->control_sock, cmd_buf, cmd_buf_len);
458 if (ret_len < 0) {
459 perror("[error] Error sending attach command and request");
460 goto error;
461 }
462 assert(ret_len == cmd_buf_len);
463
464 ret_len = lttng_live_recv(ctx->control_sock, &rp, sizeof(rp));
465 if (ret_len == 0) {
466 fprintf(stderr, "[error] Remote side has closed connection\n");
467 goto error;
468 }
469 if (ret_len < 0) {
470 perror("[error] Error receiving attach response");
471 goto error;
472 }
473 assert(ret_len == sizeof(rp));
474
475 switch(be32toh(rp.status)) {
476 case LTTNG_VIEWER_ATTACH_OK:
477 break;
478 case LTTNG_VIEWER_ATTACH_UNK:
479 ret = -LTTNG_VIEWER_ATTACH_UNK;
480 goto end;
481 case LTTNG_VIEWER_ATTACH_ALREADY:
482 fprintf(stderr, "[error] There is already a viewer attached to this session\n");
483 goto error;
484 case LTTNG_VIEWER_ATTACH_NOT_LIVE:
485 fprintf(stderr, "[error] Not a live session\n");
486 goto error;
487 case LTTNG_VIEWER_ATTACH_SEEK_ERR:
488 fprintf(stderr, "[error] Wrong seek parameter\n");
489 goto error;
490 default:
491 fprintf(stderr, "[error] Unknown attach return code %u\n",
492 be32toh(rp.status));
493 goto error;
494 }
495 if (be32toh(rp.status) != LTTNG_VIEWER_ATTACH_OK) {
496 goto error;
497 }
498
499 ctx->session->stream_count += be32toh(rp.streams_count);
500 /*
501 * When the session is created but not started, we do an active wait
502 * until it starts. It allows the viewer to start processing the trace
503 * as soon as the session starts.
504 */
505 if (ctx->session->stream_count == 0) {
506 ret = 0;
507 goto end;
508 }
509 printf_verbose("Waiting for %" PRIu64 " streams:\n",
510 ctx->session->stream_count);
511 ctx->session->streams = g_new0(struct lttng_live_viewer_stream,
512 ctx->session->stream_count);
513 for (i = 0; i < be32toh(rp.streams_count); i++) {
514 ret_len = lttng_live_recv(ctx->control_sock, &stream, sizeof(stream));
515 if (ret_len == 0) {
516 fprintf(stderr, "[error] Remote side has closed connection\n");
517 goto error;
518 }
519 if (ret_len < 0) {
520 perror("[error] Error receiving stream");
521 goto error;
522 }
523 assert(ret_len == sizeof(stream));
524 stream.path_name[LTTNG_VIEWER_PATH_MAX - 1] = '\0';
525 stream.channel_name[LTTNG_VIEWER_NAME_MAX - 1] = '\0';
526
527 printf_verbose(" stream %" PRIu64 " : %s/%s\n",
528 be64toh(stream.id), stream.path_name,
529 stream.channel_name);
530 ctx->session->streams[i].id = be64toh(stream.id);
531 ctx->session->streams[i].session = ctx->session;
532
533 ctx->session->streams[i].mmap_size = 0;
534 ctx->session->streams[i].ctf_stream_id = -1ULL;
535
536 if (be32toh(stream.metadata_flag)) {
537 ctx->session->streams[i].metadata_flag = 1;
538 }
539 ret = lttng_live_ctf_trace_assign(&ctx->session->streams[i],
540 be64toh(stream.ctf_trace_id));
541 if (ret < 0) {
542 goto error;
543 }
544
545 }
546 ret = 0;
547 end:
548 return ret;
549
550 error:
551 return -1;
552 }
553
554 /*
555 * Ask the relay for new streams.
556 *
557 * Returns the number of new streams received or a negative value on error.
558 */
559 static
560 int ask_new_streams(struct lttng_live_ctx *ctx)
561 {
562 int i, ret = 0, nb_streams = 0;
563 uint64_t id;
564
565 restart:
566 for (i = 0; i < ctx->session_ids->len; i++) {
567 id = g_array_index(ctx->session_ids, uint64_t, i);
568 ret = lttng_live_get_new_streams(ctx, id);
569 printf_verbose("Asking for new streams returns %d\n", ret);
570 if (ret < 0) {
571 if (lttng_live_should_quit()) {
572 goto end;
573 }
574 if (ret == -LTTNG_VIEWER_NEW_STREAMS_HUP) {
575 printf_verbose("Session %" PRIu64 " closed\n",
576 id);
577 /*
578 * The streams have already been closed during
579 * the reading, so we only need to get rid of
580 * the trace in our internal table of sessions.
581 */
582 g_array_remove_index(ctx->session_ids, i);
583 /*
584 * We can't continue iterating on the g_array
585 * after a remove, we have to start again.
586 */
587 goto restart;
588 } else {
589 ret = -1;
590 goto end;
591 }
592 } else {
593 nb_streams += ret;
594 }
595 }
596 ret = nb_streams;
597
598 end:
599 return ret;
600 }
601
602 static
603 int append_metadata(struct lttng_live_ctx *ctx,
604 struct lttng_live_viewer_stream *viewer_stream)
605 {
606 int ret;
607 struct lttng_live_viewer_stream *metadata;
608 char *metadata_buf = NULL;
609
610 if (!viewer_stream->ctf_trace->handle) {
611 printf_verbose("append_metadata: trace handle not ready yet.\n");
612 return 0;
613 }
614
615 printf_verbose("get_next_index: new metadata needed\n");
616 ret = get_new_metadata(ctx, viewer_stream, &metadata_buf);
617 if (ret < 0) {
618 free(metadata_buf);
619 goto error;
620 }
621
622 metadata = viewer_stream->ctf_trace->metadata_stream;
623 metadata->ctf_trace->metadata_fp =
624 babeltrace_fmemopen(metadata_buf,
625 metadata->metadata_len, "rb");
626 if (!metadata->ctf_trace->metadata_fp) {
627 perror("Metadata fmemopen");
628 free(metadata_buf);
629 ret = -1;
630 goto error;
631 }
632 ret = ctf_append_trace_metadata(
633 viewer_stream->ctf_trace->handle->td,
634 metadata->ctf_trace->metadata_fp);
635 /* We accept empty metadata packets */
636 if (ret != 0 && ret != -ENOENT) {
637 fprintf(stderr, "[error] Appending metadata\n");
638 goto error;
639 }
640 ret = 0;
641
642 error:
643 return ret;
644 }
645
646 static
647 int get_data_packet(struct lttng_live_ctx *ctx,
648 struct ctf_stream_pos *pos,
649 struct lttng_live_viewer_stream *stream, uint64_t offset,
650 uint64_t len)
651 {
652 struct lttng_viewer_cmd cmd;
653 struct lttng_viewer_get_packet rq;
654 struct lttng_viewer_trace_packet rp;
655 const size_t cmd_buf_len = sizeof(cmd) + sizeof(rq);
656 char cmd_buf[cmd_buf_len];
657 ssize_t ret_len;
658 int ret;
659
660 retry:
661 if (lttng_live_should_quit()) {
662 ret = -1;
663 goto end;
664 }
665
666 cmd.cmd = htobe32(LTTNG_VIEWER_GET_PACKET);
667 cmd.data_size = htobe64((uint64_t) sizeof(rq));
668 cmd.cmd_version = htobe32(0);
669
670 memset(&rq, 0, sizeof(rq));
671 rq.stream_id = htobe64(stream->id);
672 rq.offset = htobe64(offset);
673 rq.len = htobe32(len);
674
675 /*
676 * Merge the cmd and connection request to prevent a write-write
677 * sequence on the TCP socket. Otherwise, a delayed ACK will prevent the
678 * second write to be performed quickly in presence of Nagle's algorithm.
679 */
680 memcpy(cmd_buf, &cmd, sizeof(cmd));
681 memcpy(cmd_buf + sizeof(cmd), &rq, sizeof(rq));
682
683 ret_len = lttng_live_send(ctx->control_sock, cmd_buf, cmd_buf_len);
684 if (ret_len < 0) {
685 perror("[error] Error sending get_data_packet cmd and request");
686 goto error;
687 }
688 assert(ret_len == cmd_buf_len);
689
690 ret_len = lttng_live_recv(ctx->control_sock, &rp, sizeof(rp));
691 if (ret_len == 0) {
692 fprintf(stderr, "[error] Remote side has closed connection\n");
693 goto error;
694 }
695 if (ret_len < 0) {
696 perror("[error] Error receiving data response");
697 goto error;
698 }
699 if (ret_len != sizeof(rp)) {
700 fprintf(stderr, "[error] get_data_packet: expected %zu"
701 ", received %zd\n", sizeof(rp),
702 ret_len);
703 goto error;
704 }
705
706 rp.flags = be32toh(rp.flags);
707
708 switch (be32toh(rp.status)) {
709 case LTTNG_VIEWER_GET_PACKET_OK:
710 len = be32toh(rp.len);
711 printf_verbose("get_data_packet: Ok, packet size : %" PRIu64
712 "\n", len);
713 break;
714 case LTTNG_VIEWER_GET_PACKET_RETRY:
715 /* Unimplemented by relay daemon */
716 printf_verbose("get_data_packet: retry\n");
717 goto error;
718 case LTTNG_VIEWER_GET_PACKET_ERR:
719 if (rp.flags & LTTNG_VIEWER_FLAG_NEW_METADATA) {
720 printf_verbose("get_data_packet: new metadata needed\n");
721 ret = append_metadata(ctx, stream);
722 if (ret)
723 goto error;
724 }
725 if (rp.flags & LTTNG_VIEWER_FLAG_NEW_STREAM) {
726 printf_verbose("get_data_packet: new streams needed\n");
727 ret = ask_new_streams(ctx);
728 if (ret < 0) {
729 goto error;
730 } else if (ret > 0) {
731 ret = add_traces(ctx);
732 if (ret < 0) {
733 goto error;
734 }
735 }
736 }
737 if (rp.flags & (LTTNG_VIEWER_FLAG_NEW_METADATA
738 | LTTNG_VIEWER_FLAG_NEW_STREAM)) {
739 goto retry;
740 }
741 fprintf(stderr, "[error] get_data_packet: error\n");
742 goto error;
743 case LTTNG_VIEWER_GET_PACKET_EOF:
744 ret = -2;
745 goto end;
746 default:
747 printf_verbose("get_data_packet: unknown\n");
748 goto error;
749 }
750
751 if (len == 0) {
752 goto error;
753 }
754
755 if (len > stream->mmap_size) {
756 uint64_t new_size;
757
758 new_size = max_t(uint64_t, len, stream->mmap_size << 1);
759 if (pos->base_mma) {
760 /* unmap old base */
761 ret = munmap_align(pos->base_mma);
762 if (ret) {
763 perror("[error] Unable to unmap old base");
764 goto error;
765 }
766 pos->base_mma = NULL;
767 }
768 pos->base_mma = mmap_align(new_size,
769 PROT_READ | PROT_WRITE,
770 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
771 if (pos->base_mma == MAP_FAILED) {
772 perror("[error] mmap error");
773 pos->base_mma = NULL;
774 goto error;
775 }
776
777 stream->mmap_size = new_size;
778 printf_verbose("Expanding stream mmap size to %" PRIu64 " bytes\n",
779 stream->mmap_size);
780 }
781
782 ret_len = lttng_live_recv(ctx->control_sock,
783 mmap_align_addr(pos->base_mma), len);
784 if (ret_len == 0) {
785 fprintf(stderr, "[error] Remote side has closed connection\n");
786 goto error;
787 }
788 if (ret_len < 0) {
789 perror("[error] Error receiving trace packet");
790 goto error;
791 }
792 assert(ret_len == len);
793 ret = 0;
794 end:
795 return ret;
796
797 error:
798 return -1;
799 }
800
801 static
802 int get_one_metadata_packet(struct lttng_live_ctx *ctx,
803 struct lttng_live_viewer_stream *metadata_stream)
804 {
805 uint64_t len = 0;
806 int ret;
807 struct lttng_viewer_cmd cmd;
808 struct lttng_viewer_get_metadata rq;
809 struct lttng_viewer_metadata_packet rp;
810 char *data = NULL;
811 ssize_t ret_len;
812 const size_t cmd_buf_len = sizeof(cmd) + sizeof(rq);
813 char cmd_buf[cmd_buf_len];
814
815 if (lttng_live_should_quit()) {
816 ret = -1;
817 goto end;
818 }
819
820 rq.stream_id = htobe64(metadata_stream->id);
821 cmd.cmd = htobe32(LTTNG_VIEWER_GET_METADATA);
822 cmd.data_size = htobe64((uint64_t) sizeof(rq));
823 cmd.cmd_version = htobe32(0);
824
825 /*
826 * Merge the cmd and connection request to prevent a write-write
827 * sequence on the TCP socket. Otherwise, a delayed ACK will prevent the
828 * second write to be performed quickly in presence of Nagle's algorithm.
829 */
830 memcpy(cmd_buf, &cmd, sizeof(cmd));
831 memcpy(cmd_buf + sizeof(cmd), &rq, sizeof(rq));
832
833 ret_len = lttng_live_send(ctx->control_sock, cmd_buf, cmd_buf_len);
834 if (ret_len < 0) {
835 perror("[error] Error sending get_metadata cmd and request");
836 goto error;
837 }
838 assert(ret_len == cmd_buf_len);
839
840 ret_len = lttng_live_recv(ctx->control_sock, &rp, sizeof(rp));
841 if (ret_len == 0) {
842 fprintf(stderr, "[error] Remote side has closed connection\n");
843 goto error;
844 }
845 if (ret_len < 0) {
846 perror("[error] Error receiving metadata response");
847 goto error;
848 }
849 assert(ret_len == sizeof(rp));
850
851 switch (be32toh(rp.status)) {
852 case LTTNG_VIEWER_METADATA_OK:
853 printf_verbose("get_metadata : OK\n");
854 break;
855 case LTTNG_VIEWER_NO_NEW_METADATA:
856 printf_verbose("get_metadata : NO NEW\n");
857 ret = 0;
858 goto end;
859 case LTTNG_VIEWER_METADATA_ERR:
860 printf_verbose("get_metadata : ERR\n");
861 goto error;
862 default:
863 printf_verbose("get_metadata : UNKNOWN\n");
864 goto error;
865 }
866
867 len = be64toh(rp.len);
868 printf_verbose("Writing %" PRIu64" bytes to metadata\n", len);
869 if (len <= 0) {
870 goto error;
871 }
872
873 data = zmalloc(len);
874 if (!data) {
875 perror("relay data zmalloc");
876 goto error;
877 }
878 ret_len = lttng_live_recv(ctx->control_sock, data, len);
879 if (ret_len == 0) {
880 fprintf(stderr, "[error] Remote side has closed connection\n");
881 goto error_free_data;
882 }
883 if (ret_len < 0) {
884 perror("[error] Error receiving trace packet");
885 goto error_free_data;
886 }
887 assert(ret_len == len);
888
889 do {
890 ret_len = fwrite(data, 1, len,
891 metadata_stream->metadata_fp_write);
892 } while (ret_len < 0 && errno == EINTR);
893 if (ret_len < 0) {
894 fprintf(stderr, "[error] Writing in the metadata fp\n");
895 goto error_free_data;
896 }
897 assert(ret_len == len);
898 metadata_stream->metadata_len += len;
899 free(data);
900 ret = len;
901 end:
902 return ret;
903
904 error_free_data:
905 free(data);
906 error:
907 return -1;
908 }
909
910 /*
911 * Return 0 on success, a negative value on error.
912 */
913 static
914 int get_new_metadata(struct lttng_live_ctx *ctx,
915 struct lttng_live_viewer_stream *viewer_stream,
916 char **metadata_buf)
917 {
918 int ret = 0;
919 struct lttng_live_viewer_stream *metadata_stream;
920 size_t size, len_read = 0;
921
922 metadata_stream = viewer_stream->ctf_trace->metadata_stream;
923 if (!metadata_stream) {
924 fprintf(stderr, "[error] No metadata stream\n");
925 ret = -1;
926 goto error;
927 }
928 metadata_stream->metadata_len = 0;
929 ret = open_metadata_fp_write(metadata_stream, metadata_buf, &size);
930 if (ret < 0) {
931 goto error;
932 }
933
934 do {
935 if (lttng_live_should_quit()) {
936 ret = -1;
937 goto error;
938 }
939 /*
940 * get_one_metadata_packet returns the number of bytes
941 * received, 0 when we have received everything, a
942 * negative value on error.
943 */
944 ret = get_one_metadata_packet(ctx, metadata_stream);
945 if (ret > 0) {
946 len_read += ret;
947 }
948 if (!len_read) {
949 (void) poll(NULL, 0, ACTIVE_POLL_DELAY);
950 }
951 } while (ret > 0 || !len_read);
952
953 if (babeltrace_close_memstream(metadata_buf, &size,
954 metadata_stream->metadata_fp_write)) {
955 perror("babeltrace_close_memstream");
956 }
957 metadata_stream->metadata_fp_write = NULL;
958
959 error:
960 return ret;
961 }
962
963 /*
964 * Assign the fields from a lttng_viewer_index to a packet_index.
965 */
966 static
967 void lttng_index_to_packet_index(struct lttng_viewer_index *lindex,
968 struct packet_index *pindex)
969 {
970 assert(lindex);
971 assert(pindex);
972
973 pindex->offset = be64toh(lindex->offset);
974 pindex->packet_size = be64toh(lindex->packet_size);
975 pindex->content_size = be64toh(lindex->content_size);
976 pindex->ts_cycles.timestamp_begin = be64toh(lindex->timestamp_begin);
977 pindex->ts_cycles.timestamp_end = be64toh(lindex->timestamp_end);
978 pindex->events_discarded = be64toh(lindex->events_discarded);
979 }
980
981 /*
982 * Get one index for a stream.
983 *
984 * Returns 0 on success or a negative value on error.
985 */
986 static
987 int get_next_index(struct lttng_live_ctx *ctx,
988 struct lttng_live_viewer_stream *viewer_stream,
989 struct packet_index *index, uint64_t *stream_id)
990 {
991 struct lttng_viewer_cmd cmd;
992 struct lttng_viewer_get_next_index rq;
993 int ret;
994 ssize_t ret_len;
995 struct lttng_viewer_index *rp = &viewer_stream->current_index;
996 const size_t cmd_buf_len = sizeof(cmd) + sizeof(rq);
997 char cmd_buf[cmd_buf_len];
998
999 cmd.cmd = htobe32(LTTNG_VIEWER_GET_NEXT_INDEX);
1000 cmd.data_size = htobe64((uint64_t) sizeof(rq));
1001 cmd.cmd_version = htobe32(0);
1002
1003 memset(&rq, 0, sizeof(rq));
1004 rq.stream_id = htobe64(viewer_stream->id);
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 retry:
1014 if (lttng_live_should_quit()) {
1015 ret = -1;
1016 goto end;
1017 }
1018 ret_len = lttng_live_send(ctx->control_sock, &cmd_buf, cmd_buf_len);
1019 if (ret_len < 0) {
1020 perror("[error] Error sending get_next_index cmd and request");
1021 goto error;
1022 }
1023 assert(ret_len == cmd_buf_len);
1024
1025 ret_len = lttng_live_recv(ctx->control_sock, rp, sizeof(*rp));
1026 if (ret_len == 0) {
1027 fprintf(stderr, "[error] Remote side has closed connection\n");
1028 goto error;
1029 }
1030 if (ret_len < 0) {
1031 perror("[error] Error receiving index response");
1032 goto error;
1033 }
1034 assert(ret_len == sizeof(*rp));
1035
1036 rp->flags = be32toh(rp->flags);
1037
1038 switch (be32toh(rp->status)) {
1039 case LTTNG_VIEWER_INDEX_INACTIVE:
1040 printf_verbose("get_next_index: inactive\n");
1041
1042 if (index->ts_cycles.timestamp_end ==
1043 be64toh(rp->timestamp_end)) {
1044 /* Already seen this timestamp. */
1045 (void) poll(NULL, 0, ACTIVE_POLL_DELAY);
1046 }
1047
1048 memset(index, 0, sizeof(struct packet_index));
1049 index->ts_cycles.timestamp_end = be64toh(rp->timestamp_end);
1050 *stream_id = be64toh(rp->stream_id);
1051 break;
1052 case LTTNG_VIEWER_INDEX_OK:
1053 printf_verbose("get_next_index: Ok, need metadata update : %u\n",
1054 rp->flags & LTTNG_VIEWER_FLAG_NEW_METADATA);
1055 lttng_index_to_packet_index(rp, index);
1056 *stream_id = be64toh(rp->stream_id);
1057 viewer_stream->data_pending = 1;
1058
1059 if (rp->flags & LTTNG_VIEWER_FLAG_NEW_METADATA) {
1060 ret = append_metadata(ctx, viewer_stream);
1061 if (ret)
1062 goto error;
1063 }
1064 if (rp->flags & LTTNG_VIEWER_FLAG_NEW_STREAM) {
1065 printf_verbose("get_next_index: need new streams\n");
1066 ret = ask_new_streams(ctx);
1067 if (ret < 0) {
1068 goto error;
1069 } else if (ret > 0) {
1070 ret = add_traces(ctx);
1071 if (ret < 0) {
1072 goto error;
1073 }
1074 }
1075 }
1076 break;
1077 case LTTNG_VIEWER_INDEX_RETRY:
1078 printf_verbose("get_next_index: retry\n");
1079 (void) poll(NULL, 0, ACTIVE_POLL_DELAY);
1080 goto retry;
1081 case LTTNG_VIEWER_INDEX_HUP:
1082 printf_verbose("get_next_index: stream hung up\n");
1083 viewer_stream->id = -1ULL;
1084 index->offset = EOF;
1085 ctx->session->stream_count--;
1086 break;
1087 case LTTNG_VIEWER_INDEX_ERR:
1088 fprintf(stderr, "[error] get_next_index: error\n");
1089 goto error;
1090 default:
1091 fprintf(stderr, "[error] get_next_index: unkwown value\n");
1092 goto error;
1093 }
1094 ret = 0;
1095 end:
1096 return ret;
1097
1098 error:
1099 return -1;
1100 }
1101
1102 static
1103 void read_packet_header(struct ctf_stream_pos *pos,
1104 struct ctf_file_stream *file_stream)
1105 {
1106 int ret;
1107
1108 /* update trace_packet_header and stream_packet_context */
1109 if (!(pos->prot & PROT_WRITE) &&
1110 file_stream->parent.trace_packet_header) {
1111 /* Read packet header */
1112 ret = generic_rw(&pos->parent,
1113 &file_stream->parent.trace_packet_header->p);
1114 if (ret) {
1115 pos->offset = EOF;
1116 fprintf(stderr, "[error] trace packet "
1117 "header read failed\n");
1118 goto end;
1119 }
1120 }
1121 if (!(pos->prot & PROT_WRITE) &&
1122 file_stream->parent.stream_packet_context) {
1123 /* Read packet context */
1124 ret = generic_rw(&pos->parent,
1125 &file_stream->parent.stream_packet_context->p);
1126 if (ret) {
1127 pos->offset = EOF;
1128 fprintf(stderr, "[error] stream packet "
1129 "context read failed\n");
1130 goto end;
1131 }
1132 }
1133 pos->data_offset = pos->offset;
1134
1135 end:
1136 return;
1137 }
1138
1139 /*
1140 * Handle the seek parameters.
1141 * Returns 0 if the packet_seek can continue, a positive value to
1142 * cleanly exit the packet_seek, a negative value on error.
1143 */
1144 static
1145 int handle_seek_position(size_t index, int whence,
1146 struct lttng_live_viewer_stream *viewer_stream,
1147 struct ctf_stream_pos *pos,
1148 struct ctf_file_stream *file_stream)
1149 {
1150 int ret = 0;
1151
1152 switch (whence) {
1153 case SEEK_CUR:
1154 ret = 0;
1155 goto end;
1156 case SEEK_SET:
1157 /*
1158 * We only allow to seek to 0.
1159 */
1160 if (index != 0) {
1161 fprintf(stderr, "[error] Arbitrary seek in lttng-live "
1162 "trace not supported\n");
1163 pos->offset = EOF;
1164 ret = -1;
1165 goto end;
1166 }
1167
1168 ret = 0;
1169 goto end;
1170
1171 default:
1172 fprintf(stderr, "[error] Invalid seek parameter\n");
1173 assert(0);
1174 }
1175
1176 end:
1177 return ret;
1178 }
1179
1180 static
1181 void ctf_live_packet_seek(struct bt_stream_pos *stream_pos, size_t index,
1182 int whence)
1183 {
1184 struct ctf_stream_pos *pos;
1185 struct ctf_file_stream *file_stream;
1186 struct packet_index *prev_index = NULL, *cur_index;
1187 struct lttng_live_viewer_stream *viewer_stream;
1188 struct lttng_live_session *session;
1189 uint64_t stream_id = -1ULL;
1190 int ret;
1191
1192 pos = ctf_pos(stream_pos);
1193 file_stream = container_of(pos, struct ctf_file_stream, pos);
1194 viewer_stream = (struct lttng_live_viewer_stream *) pos->priv;
1195 session = viewer_stream->session;
1196
1197 ret = handle_seek_position(index, whence, viewer_stream, pos,
1198 file_stream);
1199 if (ret != 0) {
1200 return;
1201 }
1202
1203 retry:
1204 switch (pos->packet_index->len) {
1205 case 0:
1206 g_array_set_size(pos->packet_index, 1);
1207 cur_index = &g_array_index(pos->packet_index,
1208 struct packet_index, 0);
1209 break;
1210 case 1:
1211 g_array_set_size(pos->packet_index, 2);
1212 prev_index = &g_array_index(pos->packet_index,
1213 struct packet_index, 0);
1214 cur_index = &g_array_index(pos->packet_index,
1215 struct packet_index, 1);
1216 break;
1217 case 2:
1218 g_array_index(pos->packet_index,
1219 struct packet_index, 0) =
1220 g_array_index(pos->packet_index,
1221 struct packet_index, 1);
1222 prev_index = &g_array_index(pos->packet_index,
1223 struct packet_index, 0);
1224 cur_index = &g_array_index(pos->packet_index,
1225 struct packet_index, 1);
1226 break;
1227 default:
1228 abort();
1229 break;
1230 }
1231
1232 if (viewer_stream->data_pending) {
1233 lttng_index_to_packet_index(&viewer_stream->current_index, cur_index);
1234 } else {
1235 printf_verbose("get_next_index for stream %" PRIu64 "\n", viewer_stream->id);
1236 ret = get_next_index(session->ctx, viewer_stream, cur_index, &stream_id);
1237 if (ret < 0) {
1238 pos->offset = EOF;
1239 if (!lttng_live_should_quit()) {
1240 fprintf(stderr, "[error] get_next_index failed\n");
1241 }
1242 return;
1243 }
1244 printf_verbose("Index received : packet_size : %" PRIu64
1245 ", offset %" PRIu64 ", content_size %" PRIu64
1246 ", timestamp_end : %" PRIu64 "\n",
1247 cur_index->packet_size, cur_index->offset,
1248 cur_index->content_size,
1249 cur_index->ts_cycles.timestamp_end);
1250
1251 }
1252
1253 /*
1254 * On the first time we receive an index, the stream_id needs to
1255 * be set for the stream in order to use it, we don't want any
1256 * data at this stage.
1257 */
1258 if (file_stream->parent.stream_id == -1ULL) {
1259 /*
1260 * Warning: with lttng-tools < 2.4.2, the beacon does not
1261 * contain the real stream ID, it is memset to 0, so this
1262 * might create a problem when a session has multiple
1263 * channels. We can't detect it at this stage, lttng-tools
1264 * has to be upgraded to fix this problem.
1265 */
1266 printf_verbose("Assigning stream_id %" PRIu64 "\n",
1267 stream_id);
1268 file_stream->parent.stream_id = stream_id;
1269 viewer_stream->ctf_stream_id = stream_id;
1270
1271 return;
1272 }
1273
1274 pos->packet_size = cur_index->packet_size;
1275 pos->content_size = cur_index->content_size;
1276 pos->mmap_base_offset = 0;
1277 if (cur_index->offset == EOF) {
1278 pos->offset = EOF;
1279 } else {
1280 pos->offset = 0;
1281 }
1282
1283 if (cur_index->content_size == 0) {
1284 /* Beacon packet index */
1285 if (file_stream->parent.stream_class) {
1286 file_stream->parent.cycles_timestamp =
1287 cur_index->ts_cycles.timestamp_end;
1288 file_stream->parent.real_timestamp = ctf_get_real_timestamp(
1289 &file_stream->parent,
1290 cur_index->ts_cycles.timestamp_end);
1291
1292 /*
1293 * Duplicate the data from the previous index, because
1294 * the one we just received is only a beacon with no
1295 * relevant information except the timestamp_end. We
1296 * don't need to keep this timestamp_end because we already
1297 * updated the file_stream timestamps, so we only need
1298 * to keep the last real index data as prev_index. That
1299 * way, we keep the original prev timestamps and
1300 * discarded events counter. This is the same behaviour
1301 * as if we were reading a local trace, we would not
1302 * have fake indexes between real indexes.
1303 */
1304 memcpy(cur_index, prev_index, sizeof(struct packet_index));
1305 }
1306 } else {
1307 /* Real packet index */
1308 if (file_stream->parent.stream_class) {
1309 /* Convert the timestamps and append to the real_index. */
1310 cur_index->ts_real.timestamp_begin = ctf_get_real_timestamp(
1311 &file_stream->parent,
1312 cur_index->ts_cycles.timestamp_begin);
1313 cur_index->ts_real.timestamp_end = ctf_get_real_timestamp(
1314 &file_stream->parent,
1315 cur_index->ts_cycles.timestamp_end);
1316 }
1317
1318 ctf_update_current_packet_index(&file_stream->parent,
1319 prev_index, cur_index);
1320
1321 /*
1322 * We need to check if we are in trace read or called
1323 * from packet indexing. In this last case, the
1324 * collection is not there, so we cannot print the
1325 * timestamps.
1326 */
1327 if ((&file_stream->parent)->stream_class->trace->parent.collection) {
1328 ctf_print_discarded_lost(stderr, &file_stream->parent);
1329 }
1330
1331 file_stream->parent.cycles_timestamp =
1332 cur_index->ts_cycles.timestamp_begin;
1333 file_stream->parent.real_timestamp =
1334 cur_index->ts_real.timestamp_begin;
1335 }
1336
1337 /*
1338 * Flush the output between attempts to grab a packet, thus
1339 * ensuring we flush at least at the periodical timer period.
1340 * This ensures the output remains reactive for interactive users and
1341 * that the output is flushed when redirected to a file by the shell.
1342 */
1343 if (fflush(LTTNG_LIVE_OUTPUT_FP) < 0) {
1344 perror("fflush");
1345 goto end;
1346 }
1347
1348 if (pos->packet_size == 0 || pos->offset == EOF) {
1349 goto end;
1350 }
1351
1352 printf_verbose("get_data_packet for stream %" PRIu64 "\n",
1353 viewer_stream->id);
1354 ret = get_data_packet(session->ctx, pos, viewer_stream,
1355 cur_index->offset,
1356 cur_index->packet_size / CHAR_BIT);
1357 if (ret == -2) {
1358 goto retry;
1359 } else if (ret < 0) {
1360 pos->offset = EOF;
1361 if (!lttng_live_should_quit()) {
1362 fprintf(stderr, "[error] get_data_packet failed\n");
1363 }
1364 return;
1365 }
1366 viewer_stream->data_pending = 0;
1367
1368 read_packet_header(pos, file_stream);
1369
1370 end:
1371 return;
1372 }
1373
1374 int lttng_live_create_viewer_session(struct lttng_live_ctx *ctx)
1375 {
1376 struct lttng_viewer_cmd cmd;
1377 struct lttng_viewer_create_session_response resp;
1378 int ret;
1379 ssize_t ret_len;
1380
1381 if (lttng_live_should_quit()) {
1382 ret = -1;
1383 goto end;
1384 }
1385
1386 cmd.cmd = htobe32(LTTNG_VIEWER_CREATE_SESSION);
1387 cmd.data_size = htobe64((uint64_t) 0);
1388 cmd.cmd_version = htobe32(0);
1389
1390 ret_len = lttng_live_send(ctx->control_sock, &cmd, sizeof(cmd));
1391 if (ret_len < 0) {
1392 perror("[error] Error sending cmd");
1393 goto error;
1394 }
1395 assert(ret_len == sizeof(cmd));
1396
1397 ret_len = lttng_live_recv(ctx->control_sock, &resp, sizeof(resp));
1398 if (ret_len == 0) {
1399 fprintf(stderr, "[error] Remote side has closed connection\n");
1400 goto error;
1401 }
1402 if (ret_len < 0) {
1403 perror("[error] Error receiving create session reply");
1404 goto error;
1405 }
1406 assert(ret_len == sizeof(resp));
1407
1408 if (be32toh(resp.status) != LTTNG_VIEWER_CREATE_SESSION_OK) {
1409 fprintf(stderr, "[error] Error creating viewer session\n");
1410 goto error;
1411 }
1412 ret = 0;
1413 end:
1414 return ret;
1415
1416 error:
1417 return -1;
1418 }
1419
1420 static
1421 int del_traces(gpointer key, gpointer value, gpointer user_data)
1422 {
1423 struct bt_context *bt_ctx = user_data;
1424 struct lttng_live_ctf_trace *trace = value;
1425 int ret;
1426
1427 ret = bt_context_remove_trace(bt_ctx, trace->trace_id);
1428 if (ret < 0)
1429 fprintf(stderr, "[error] removing trace from context\n");
1430
1431 /* remove the key/value pair from the HT. */
1432 return 1;
1433 }
1434
1435 static
1436 int add_one_trace(struct lttng_live_ctx *ctx,
1437 struct lttng_live_ctf_trace *trace)
1438 {
1439 int i, ret;
1440 struct bt_context *bt_ctx = ctx->bt_ctx;
1441 struct lttng_live_viewer_stream *stream;
1442 struct bt_mmap_stream *new_mmap_stream;
1443 struct bt_mmap_stream_list mmap_list;
1444 struct bt_trace_descriptor *td;
1445 struct bt_trace_handle *handle;
1446
1447 /*
1448 * We don't know how many streams we will receive for a trace, so
1449 * once we are done receiving the traces, we add all the traces
1450 * received to the bt_context.
1451 * We can receive streams during the attach command or the
1452 * get_new_streams, so we have to make sure not to add multiple
1453 * times the same traces.
1454 * If a trace is already in the context, we just skip this function.
1455 */
1456 if (trace->in_use) {
1457 ret = 0;
1458 goto end;
1459 }
1460
1461 BT_INIT_LIST_HEAD(&mmap_list.head);
1462
1463 for (i = 0; i < trace->streams->len; i++) {
1464 stream = g_ptr_array_index(trace->streams, i);
1465
1466 if (!stream->metadata_flag) {
1467 new_mmap_stream = zmalloc(sizeof(struct bt_mmap_stream));
1468 new_mmap_stream->priv = (void *) stream;
1469 new_mmap_stream->fd = -1;
1470 bt_list_add(&new_mmap_stream->list, &mmap_list.head);
1471 } else {
1472 char *metadata_buf = NULL;
1473
1474 /* Get all possible metadata before starting */
1475 ret = get_new_metadata(ctx, stream, &metadata_buf);
1476 if (ret) {
1477 free(metadata_buf);
1478 goto end_free;
1479 }
1480 if (!stream->metadata_len) {
1481 fprintf(stderr, "[error] empty metadata\n");
1482 ret = -1;
1483 free(metadata_buf);
1484 goto end_free;
1485 }
1486
1487 trace->metadata_fp = babeltrace_fmemopen(metadata_buf,
1488 stream->metadata_len, "rb");
1489 if (!trace->metadata_fp) {
1490 perror("Metadata fmemopen");
1491 ret = -1;
1492 free(metadata_buf);
1493 goto end_free;
1494 }
1495 }
1496 }
1497
1498 if (!trace->metadata_fp) {
1499 fprintf(stderr, "[error] No metadata stream opened\n");
1500 ret = -1;
1501 goto end_free;
1502 }
1503
1504 ret = bt_context_add_trace(bt_ctx, NULL, "ctf",
1505 ctf_live_packet_seek, &mmap_list, trace->metadata_fp);
1506 if (ret < 0) {
1507 fprintf(stderr, "[error] Error adding trace\n");
1508 ret = -1;
1509 goto end_free;
1510 }
1511 trace->metadata_stream->metadata_len = 0;
1512
1513 handle = (struct bt_trace_handle *) g_hash_table_lookup(
1514 bt_ctx->trace_handles,
1515 (gpointer) (unsigned long) ret);
1516 td = handle->td;
1517 trace->handle = handle;
1518 if (bt_ctx->current_iterator) {
1519 bt_iter_add_trace(bt_ctx->current_iterator, td);
1520 }
1521
1522 trace->trace_id = ret;
1523 trace->in_use = 1;
1524
1525 goto end;
1526
1527 end_free:
1528 bt_context_put(bt_ctx);
1529 end:
1530 return ret;
1531 }
1532
1533 static
1534 int add_traces(struct lttng_live_ctx *ctx)
1535 {
1536 int ret;
1537 struct lttng_live_ctf_trace *trace;
1538 GHashTableIter it;
1539 gpointer key;
1540 gpointer value;
1541
1542 g_hash_table_iter_init(&it, ctx->session->ctf_traces);
1543 while (g_hash_table_iter_next(&it, &key, &value)) {
1544 trace = (struct lttng_live_ctf_trace *) value;
1545 ret = add_one_trace(ctx, trace);
1546 if (ret < 0) {
1547 goto end;
1548 }
1549 }
1550
1551 ret = 0;
1552
1553 end:
1554 return ret;
1555 }
1556
1557 /*
1558 * Request new streams for a session.
1559 * Returns the number of streams received or a negative value on error.
1560 */
1561 int lttng_live_get_new_streams(struct lttng_live_ctx *ctx, uint64_t id)
1562 {
1563 struct lttng_viewer_cmd cmd;
1564 struct lttng_viewer_new_streams_request rq;
1565 struct lttng_viewer_new_streams_response rp;
1566 struct lttng_viewer_stream stream;
1567 int ret, i, nb_streams = 0;
1568 ssize_t ret_len;
1569 uint32_t stream_count;
1570 const size_t cmd_buf_len = sizeof(cmd) + sizeof(rq);
1571 char cmd_buf[cmd_buf_len];
1572
1573 if (lttng_live_should_quit()) {
1574 ret = -1;
1575 goto end;
1576 }
1577
1578 cmd.cmd = htobe32(LTTNG_VIEWER_GET_NEW_STREAMS);
1579 cmd.data_size = htobe64((uint64_t) sizeof(rq));
1580 cmd.cmd_version = htobe32(0);
1581
1582 memset(&rq, 0, sizeof(rq));
1583 rq.session_id = htobe64(id);
1584
1585 /*
1586 * Merge the cmd and connection request to prevent a write-write
1587 * sequence on the TCP socket. Otherwise, a delayed ACK will prevent the
1588 * second write to be performed quickly in presence of Nagle's algorithm.
1589 */
1590 memcpy(cmd_buf, &cmd, sizeof(cmd));
1591 memcpy(cmd_buf + sizeof(cmd), &rq, sizeof(rq));
1592
1593 ret_len = lttng_live_send(ctx->control_sock, cmd_buf, cmd_buf_len);
1594 if (ret_len < 0) {
1595 perror("[error] Error sending get_new_streams cmd and request");
1596 goto error;
1597 }
1598 assert(ret_len == cmd_buf_len);
1599
1600 ret_len = lttng_live_recv(ctx->control_sock, &rp, sizeof(rp));
1601 if (ret_len == 0) {
1602 fprintf(stderr, "[error] Remote side has closed connection\n");
1603 goto error;
1604 }
1605 if (ret_len < 0) {
1606 perror("[error] Error receiving get_new_streams response");
1607 goto error;
1608 }
1609 assert(ret_len == sizeof(rp));
1610
1611 switch(be32toh(rp.status)) {
1612 case LTTNG_VIEWER_NEW_STREAMS_OK:
1613 break;
1614 case LTTNG_VIEWER_NEW_STREAMS_NO_NEW:
1615 ret = 0;
1616 goto end;
1617 case LTTNG_VIEWER_NEW_STREAMS_HUP:
1618 ret = -LTTNG_VIEWER_NEW_STREAMS_HUP;
1619 goto end;
1620 case LTTNG_VIEWER_NEW_STREAMS_ERR:
1621 fprintf(stderr, "[error] get_new_streams error\n");
1622 goto error;
1623 default:
1624 fprintf(stderr, "[error] Unknown return code %u\n",
1625 be32toh(rp.status));
1626 goto error;
1627 }
1628
1629 stream_count = be32toh(rp.streams_count);
1630 ctx->session->stream_count += stream_count;
1631 /*
1632 * When the session is created but not started, we do an active wait
1633 * until it starts. It allows the viewer to start processing the trace
1634 * as soon as the session starts.
1635 */
1636 if (ctx->session->stream_count == 0) {
1637 ret = 0;
1638 goto end;
1639 }
1640 printf_verbose("Waiting for %" PRIu64 " streams:\n",
1641 ctx->session->stream_count);
1642 ctx->session->streams = g_new0(struct lttng_live_viewer_stream,
1643 ctx->session->stream_count);
1644 for (i = 0; i < stream_count; i++) {
1645 ret_len = lttng_live_recv(ctx->control_sock, &stream, sizeof(stream));
1646 if (ret_len == 0) {
1647 fprintf(stderr, "[error] Remote side has closed connection\n");
1648 goto error;
1649 }
1650 if (ret_len < 0) {
1651 perror("[error] Error receiving stream");
1652 goto error;
1653 }
1654 assert(ret_len == sizeof(stream));
1655 stream.path_name[LTTNG_VIEWER_PATH_MAX - 1] = '\0';
1656 stream.channel_name[LTTNG_VIEWER_NAME_MAX - 1] = '\0';
1657
1658 printf_verbose(" stream %" PRIu64 " : %s/%s\n",
1659 be64toh(stream.id), stream.path_name,
1660 stream.channel_name);
1661 ctx->session->streams[i].id = be64toh(stream.id);
1662 ctx->session->streams[i].session = ctx->session;
1663
1664 ctx->session->streams[i].mmap_size = 0;
1665 ctx->session->streams[i].ctf_stream_id = -1ULL;
1666
1667 if (be32toh(stream.metadata_flag)) {
1668 ctx->session->streams[i].metadata_flag = 1;
1669 }
1670 ret = lttng_live_ctf_trace_assign(&ctx->session->streams[i],
1671 be64toh(stream.ctf_trace_id));
1672 if (ret < 0) {
1673 goto error;
1674 }
1675 nb_streams++;
1676
1677 }
1678 ret = nb_streams;
1679 end:
1680 return ret;
1681
1682 error:
1683 return -1;
1684 }
1685
1686 int lttng_live_read(struct lttng_live_ctx *ctx)
1687 {
1688 int ret = -1;
1689 int i;
1690 struct bt_ctf_iter *iter;
1691 const struct bt_ctf_event *event;
1692 struct bt_iter_pos begin_pos;
1693 struct bt_trace_descriptor *td_write;
1694 struct bt_format *fmt_write;
1695 struct ctf_text_stream_pos *sout;
1696 uint64_t id;
1697
1698 ctx->bt_ctx = bt_context_create();
1699 if (!ctx->bt_ctx) {
1700 fprintf(stderr, "[error] bt_context_create allocation\n");
1701 goto end;
1702 }
1703
1704 fmt_write = bt_lookup_format(g_quark_from_static_string("text"));
1705 if (!fmt_write) {
1706 fprintf(stderr, "[error] ctf-text error\n");
1707 goto end;
1708 }
1709
1710 td_write = fmt_write->open_trace(NULL, O_RDWR, NULL, NULL);
1711 if (!td_write) {
1712 fprintf(stderr, "[error] Error opening output trace\n");
1713 goto end_free;
1714 }
1715
1716 sout = container_of(td_write, struct ctf_text_stream_pos,
1717 trace_descriptor);
1718 if (!sout->parent.event_cb) {
1719 goto end_free;
1720 }
1721
1722 ret = lttng_live_create_viewer_session(ctx);
1723 if (ret < 0) {
1724 goto end_free;
1725 }
1726
1727 for (i = 0; i < ctx->session_ids->len; i++) {
1728 id = g_array_index(ctx->session_ids, uint64_t, i);
1729 printf_verbose("Attaching to session %" PRIu64 "\n", id);
1730 ret = lttng_live_attach_session(ctx, id);
1731 printf_verbose("Attaching session returns %d\n", ret);
1732 if (ret < 0) {
1733 if (ret == -LTTNG_VIEWER_ATTACH_UNK) {
1734 fprintf(stderr, "[error] Unknown session ID\n");
1735 }
1736 goto end_free;
1737 }
1738 }
1739
1740 /*
1741 * As long as the session is active, we try to get new streams.
1742 */
1743 for (;;) {
1744 int flags;
1745
1746 if (lttng_live_should_quit()) {
1747 ret = 0;
1748 goto end_free;
1749 }
1750
1751 while (!ctx->session->stream_count) {
1752 if (lttng_live_should_quit()
1753 || ctx->session_ids->len == 0) {
1754 ret = 0;
1755 goto end_free;
1756 }
1757 ret = ask_new_streams(ctx);
1758 if (ret < 0) {
1759 goto end_free;
1760 }
1761 if (!ctx->session->stream_count) {
1762 (void) poll(NULL, 0, ACTIVE_POLL_DELAY);
1763 }
1764 }
1765
1766 ret = add_traces(ctx);
1767 if (ret < 0) {
1768 goto end_free;
1769 }
1770
1771 begin_pos.type = BT_SEEK_BEGIN;
1772 iter = bt_ctf_iter_create(ctx->bt_ctx, &begin_pos, NULL);
1773 if (!iter) {
1774 if (lttng_live_should_quit()) {
1775 ret = 0;
1776 goto end;
1777 }
1778 fprintf(stderr, "[error] Iterator creation error\n");
1779 goto end;
1780 }
1781 for (;;) {
1782 if (lttng_live_should_quit()) {
1783 ret = 0;
1784 goto end_free;
1785 }
1786 event = bt_ctf_iter_read_event_flags(iter, &flags);
1787 if (!(flags & BT_ITER_FLAG_RETRY)) {
1788 if (!event) {
1789 /* End of trace */
1790 break;
1791 }
1792 ret = sout->parent.event_cb(&sout->parent,
1793 event->parent->stream);
1794 if (ret) {
1795 fprintf(stderr, "[error] Writing "
1796 "event failed.\n");
1797 goto end_free;
1798 }
1799 }
1800 ret = bt_iter_next(bt_ctf_get_iter(iter));
1801 if (ret < 0) {
1802 goto end_free;
1803 }
1804 }
1805 bt_ctf_iter_destroy(iter);
1806 g_hash_table_foreach_remove(ctx->session->ctf_traces,
1807 del_traces, ctx->bt_ctx);
1808 ctx->session->stream_count = 0;
1809 }
1810
1811 end_free:
1812 bt_context_put(ctx->bt_ctx);
1813 end:
1814 if (lttng_live_should_quit()) {
1815 ret = 0;
1816 }
1817 return ret;
1818 }
BabelTrace - Trace Format Babel Tower
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