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Fix: break loop on getting metadata error
[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 (lttng_live_should_quit()) {
571 ret = -1;
572 goto end;
573 }
574 if (ret < 0) {
575 if (ret == -LTTNG_VIEWER_NEW_STREAMS_HUP) {
576 printf_verbose("Session %" PRIu64 " closed\n",
577 id);
578 /*
579 * The streams have already been closed during
580 * the reading, so we only need to get rid of
581 * the trace in our internal table of sessions.
582 */
583 g_array_remove_index(ctx->session_ids, i);
584 /*
585 * We can't continue iterating on the g_array
586 * after a remove, we have to start again.
587 */
588 goto restart;
589 } else {
590 ret = -1;
591 goto end;
592 }
593 } else {
594 nb_streams += ret;
595 }
596 }
597 ret = nb_streams;
598
599 end:
600 return ret;
601 }
602
603 static
604 int append_metadata(struct lttng_live_ctx *ctx,
605 struct lttng_live_viewer_stream *viewer_stream)
606 {
607 int ret;
608 struct lttng_live_viewer_stream *metadata;
609 char *metadata_buf = NULL;
610
611 if (!viewer_stream->ctf_trace->handle) {
612 printf_verbose("append_metadata: trace handle not ready yet.\n");
613 return 0;
614 }
615
616 printf_verbose("get_next_index: new metadata needed\n");
617 ret = get_new_metadata(ctx, viewer_stream, &metadata_buf);
618 if (ret < 0) {
619 free(metadata_buf);
620 goto error;
621 }
622
623 metadata = viewer_stream->ctf_trace->metadata_stream;
624 metadata->ctf_trace->metadata_fp =
625 babeltrace_fmemopen(metadata_buf,
626 metadata->metadata_len, "rb");
627 if (!metadata->ctf_trace->metadata_fp) {
628 perror("Metadata fmemopen");
629 free(metadata_buf);
630 ret = -1;
631 goto error;
632 }
633 ret = ctf_append_trace_metadata(
634 viewer_stream->ctf_trace->handle->td,
635 metadata->ctf_trace->metadata_fp);
636 /* We accept empty metadata packets */
637 if (ret != 0 && ret != -ENOENT) {
638 fprintf(stderr, "[error] Appending metadata\n");
639 goto error;
640 }
641 ret = 0;
642
643 error:
644 return ret;
645 }
646
647 static
648 int get_data_packet(struct lttng_live_ctx *ctx,
649 struct ctf_stream_pos *pos,
650 struct lttng_live_viewer_stream *stream, uint64_t offset,
651 uint64_t len)
652 {
653 struct lttng_viewer_cmd cmd;
654 struct lttng_viewer_get_packet rq;
655 struct lttng_viewer_trace_packet rp;
656 const size_t cmd_buf_len = sizeof(cmd) + sizeof(rq);
657 char cmd_buf[cmd_buf_len];
658 ssize_t ret_len;
659 int ret;
660
661 retry:
662 if (lttng_live_should_quit()) {
663 ret = -1;
664 goto end;
665 }
666
667 cmd.cmd = htobe32(LTTNG_VIEWER_GET_PACKET);
668 cmd.data_size = htobe64((uint64_t) sizeof(rq));
669 cmd.cmd_version = htobe32(0);
670
671 memset(&rq, 0, sizeof(rq));
672 rq.stream_id = htobe64(stream->id);
673 rq.offset = htobe64(offset);
674 rq.len = htobe32(len);
675
676 /*
677 * Merge the cmd and connection request to prevent a write-write
678 * sequence on the TCP socket. Otherwise, a delayed ACK will prevent the
679 * second write to be performed quickly in presence of Nagle's algorithm.
680 */
681 memcpy(cmd_buf, &cmd, sizeof(cmd));
682 memcpy(cmd_buf + sizeof(cmd), &rq, sizeof(rq));
683
684 ret_len = lttng_live_send(ctx->control_sock, cmd_buf, cmd_buf_len);
685 if (ret_len < 0) {
686 perror("[error] Error sending get_data_packet cmd and request");
687 goto error;
688 }
689 assert(ret_len == cmd_buf_len);
690
691 ret_len = lttng_live_recv(ctx->control_sock, &rp, sizeof(rp));
692 if (ret_len == 0) {
693 fprintf(stderr, "[error] Remote side has closed connection\n");
694 goto error;
695 }
696 if (ret_len < 0) {
697 perror("[error] Error receiving data response");
698 goto error;
699 }
700 if (ret_len != sizeof(rp)) {
701 fprintf(stderr, "[error] get_data_packet: expected %zu"
702 ", received %zd\n", sizeof(rp),
703 ret_len);
704 goto error;
705 }
706
707 rp.flags = be32toh(rp.flags);
708
709 switch (be32toh(rp.status)) {
710 case LTTNG_VIEWER_GET_PACKET_OK:
711 len = be32toh(rp.len);
712 printf_verbose("get_data_packet: Ok, packet size : %" PRIu64
713 "\n", len);
714 break;
715 case LTTNG_VIEWER_GET_PACKET_RETRY:
716 /* Unimplemented by relay daemon */
717 printf_verbose("get_data_packet: retry\n");
718 goto error;
719 case LTTNG_VIEWER_GET_PACKET_ERR:
720 if (rp.flags & LTTNG_VIEWER_FLAG_NEW_METADATA) {
721 printf_verbose("get_data_packet: new metadata needed\n");
722 ret = append_metadata(ctx, stream);
723 if (ret)
724 goto error;
725 }
726 if (rp.flags & LTTNG_VIEWER_FLAG_NEW_STREAM) {
727 printf_verbose("get_data_packet: new streams needed\n");
728 ret = ask_new_streams(ctx);
729 if (ret < 0) {
730 goto error;
731 } else if (ret > 0) {
732 ret = add_traces(ctx);
733 if (ret < 0) {
734 goto error;
735 }
736 }
737 }
738 if (rp.flags & (LTTNG_VIEWER_FLAG_NEW_METADATA
739 | LTTNG_VIEWER_FLAG_NEW_STREAM)) {
740 goto retry;
741 }
742 fprintf(stderr, "[error] get_data_packet: error\n");
743 goto error;
744 case LTTNG_VIEWER_GET_PACKET_EOF:
745 ret = -2;
746 goto end;
747 default:
748 printf_verbose("get_data_packet: unknown\n");
749 goto error;
750 }
751
752 if (len == 0) {
753 goto error;
754 }
755
756 if (len > stream->mmap_size) {
757 uint64_t new_size;
758
759 new_size = max_t(uint64_t, len, stream->mmap_size << 1);
760 if (pos->base_mma) {
761 /* unmap old base */
762 ret = munmap_align(pos->base_mma);
763 if (ret) {
764 perror("[error] Unable to unmap old base");
765 goto error;
766 }
767 pos->base_mma = NULL;
768 }
769 pos->base_mma = mmap_align(new_size,
770 PROT_READ | PROT_WRITE,
771 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
772 if (pos->base_mma == MAP_FAILED) {
773 perror("[error] mmap error");
774 pos->base_mma = NULL;
775 goto error;
776 }
777
778 stream->mmap_size = new_size;
779 printf_verbose("Expanding stream mmap size to %" PRIu64 " bytes\n",
780 stream->mmap_size);
781 }
782
783 ret_len = lttng_live_recv(ctx->control_sock,
784 mmap_align_addr(pos->base_mma), len);
785 if (ret_len == 0) {
786 fprintf(stderr, "[error] Remote side has closed connection\n");
787 goto error;
788 }
789 if (ret_len < 0) {
790 perror("[error] Error receiving trace packet");
791 goto error;
792 }
793 assert(ret_len == len);
794 ret = 0;
795 end:
796 return ret;
797
798 error:
799 return -1;
800 }
801
802 static
803 int get_one_metadata_packet(struct lttng_live_ctx *ctx,
804 struct lttng_live_viewer_stream *metadata_stream)
805 {
806 uint64_t len = 0;
807 int ret;
808 struct lttng_viewer_cmd cmd;
809 struct lttng_viewer_get_metadata rq;
810 struct lttng_viewer_metadata_packet rp;
811 char *data = NULL;
812 ssize_t ret_len;
813 const size_t cmd_buf_len = sizeof(cmd) + sizeof(rq);
814 char cmd_buf[cmd_buf_len];
815
816 if (lttng_live_should_quit()) {
817 ret = -1;
818 goto end;
819 }
820
821 rq.stream_id = htobe64(metadata_stream->id);
822 cmd.cmd = htobe32(LTTNG_VIEWER_GET_METADATA);
823 cmd.data_size = htobe64((uint64_t) sizeof(rq));
824 cmd.cmd_version = htobe32(0);
825
826 /*
827 * Merge the cmd and connection request to prevent a write-write
828 * sequence on the TCP socket. Otherwise, a delayed ACK will prevent the
829 * second write to be performed quickly in presence of Nagle's algorithm.
830 */
831 memcpy(cmd_buf, &cmd, sizeof(cmd));
832 memcpy(cmd_buf + sizeof(cmd), &rq, sizeof(rq));
833
834 ret_len = lttng_live_send(ctx->control_sock, cmd_buf, cmd_buf_len);
835 if (ret_len < 0) {
836 perror("[error] Error sending get_metadata cmd and request");
837 goto error;
838 }
839 assert(ret_len == cmd_buf_len);
840
841 ret_len = lttng_live_recv(ctx->control_sock, &rp, sizeof(rp));
842 if (ret_len == 0) {
843 fprintf(stderr, "[error] Remote side has closed connection\n");
844 goto error;
845 }
846 if (ret_len < 0) {
847 perror("[error] Error receiving metadata response");
848 goto error;
849 }
850 assert(ret_len == sizeof(rp));
851
852 switch (be32toh(rp.status)) {
853 case LTTNG_VIEWER_METADATA_OK:
854 printf_verbose("get_metadata : OK\n");
855 break;
856 case LTTNG_VIEWER_NO_NEW_METADATA:
857 printf_verbose("get_metadata : NO NEW\n");
858 ret = 0;
859 goto end;
860 case LTTNG_VIEWER_METADATA_ERR:
861 printf_verbose("get_metadata : ERR\n");
862 goto error;
863 default:
864 printf_verbose("get_metadata : UNKNOWN\n");
865 goto error;
866 }
867
868 len = be64toh(rp.len);
869 printf_verbose("Writing %" PRIu64" bytes to metadata\n", len);
870 if (len <= 0) {
871 goto error;
872 }
873
874 data = zmalloc(len);
875 if (!data) {
876 perror("relay data zmalloc");
877 goto error;
878 }
879 ret_len = lttng_live_recv(ctx->control_sock, data, len);
880 if (ret_len == 0) {
881 fprintf(stderr, "[error] Remote side has closed connection\n");
882 goto error_free_data;
883 }
884 if (ret_len < 0) {
885 perror("[error] Error receiving trace packet");
886 goto error_free_data;
887 }
888 assert(ret_len == len);
889
890 do {
891 ret_len = fwrite(data, 1, len,
892 metadata_stream->metadata_fp_write);
893 } while (ret_len < 0 && errno == EINTR);
894 if (ret_len < 0) {
895 fprintf(stderr, "[error] Writing in the metadata fp\n");
896 goto error_free_data;
897 }
898 assert(ret_len == len);
899 metadata_stream->metadata_len += len;
900 free(data);
901 ret = len;
902 end:
903 return ret;
904
905 error_free_data:
906 free(data);
907 error:
908 return -1;
909 }
910
911 /*
912 * Return 0 on success, a negative value on error.
913 */
914 static
915 int get_new_metadata(struct lttng_live_ctx *ctx,
916 struct lttng_live_viewer_stream *viewer_stream,
917 char **metadata_buf)
918 {
919 int ret = 0;
920 struct lttng_live_viewer_stream *metadata_stream;
921 size_t size, len_read = 0;
922
923 metadata_stream = viewer_stream->ctf_trace->metadata_stream;
924 if (!metadata_stream) {
925 fprintf(stderr, "[error] No metadata stream\n");
926 ret = -1;
927 goto error;
928 }
929 metadata_stream->metadata_len = 0;
930 ret = open_metadata_fp_write(metadata_stream, metadata_buf, &size);
931 if (ret < 0) {
932 goto error;
933 }
934
935 do {
936 if (lttng_live_should_quit()) {
937 ret = -1;
938 goto error;
939 }
940 /*
941 * get_one_metadata_packet returns the number of bytes
942 * received, 0 when we have received everything, a
943 * negative value on error.
944 */
945 ret = get_one_metadata_packet(ctx, metadata_stream);
946 if (ret > 0) {
947 len_read += ret;
948 }
949 if (!len_read) {
950 (void) poll(NULL, 0, ACTIVE_POLL_DELAY);
951 }
952 if (ret < 0) {
953 break; /* Stop on error. */
954 }
955 } while (ret > 0 || !len_read);
956
957 if (babeltrace_close_memstream(metadata_buf, &size,
958 metadata_stream->metadata_fp_write)) {
959 perror("babeltrace_close_memstream");
960 }
961 metadata_stream->metadata_fp_write = NULL;
962
963 error:
964 return ret;
965 }
966
967 /*
968 * Assign the fields from a lttng_viewer_index to a packet_index.
969 */
970 static
971 void lttng_index_to_packet_index(struct lttng_viewer_index *lindex,
972 struct packet_index *pindex)
973 {
974 assert(lindex);
975 assert(pindex);
976
977 pindex->offset = be64toh(lindex->offset);
978 pindex->packet_size = be64toh(lindex->packet_size);
979 pindex->content_size = be64toh(lindex->content_size);
980 pindex->ts_cycles.timestamp_begin = be64toh(lindex->timestamp_begin);
981 pindex->ts_cycles.timestamp_end = be64toh(lindex->timestamp_end);
982 pindex->events_discarded = be64toh(lindex->events_discarded);
983 }
984
985 /*
986 * Get one index for a stream.
987 *
988 * Returns 0 on success or a negative value on error.
989 */
990 static
991 int get_next_index(struct lttng_live_ctx *ctx,
992 struct lttng_live_viewer_stream *viewer_stream,
993 struct packet_index *index, uint64_t *stream_id)
994 {
995 struct lttng_viewer_cmd cmd;
996 struct lttng_viewer_get_next_index rq;
997 int ret;
998 ssize_t ret_len;
999 struct lttng_viewer_index *rp = &viewer_stream->current_index;
1000 const size_t cmd_buf_len = sizeof(cmd) + sizeof(rq);
1001 char cmd_buf[cmd_buf_len];
1002
1003 cmd.cmd = htobe32(LTTNG_VIEWER_GET_NEXT_INDEX);
1004 cmd.data_size = htobe64((uint64_t) sizeof(rq));
1005 cmd.cmd_version = htobe32(0);
1006
1007 memset(&rq, 0, sizeof(rq));
1008 rq.stream_id = htobe64(viewer_stream->id);
1009
1010 /*
1011 * Merge the cmd and connection request to prevent a write-write
1012 * sequence on the TCP socket. Otherwise, a delayed ACK will prevent the
1013 * second write to be performed quickly in presence of Nagle's algorithm.
1014 */
1015 memcpy(cmd_buf, &cmd, sizeof(cmd));
1016 memcpy(cmd_buf + sizeof(cmd), &rq, sizeof(rq));
1017 retry:
1018 if (lttng_live_should_quit()) {
1019 ret = -1;
1020 goto end;
1021 }
1022 ret_len = lttng_live_send(ctx->control_sock, &cmd_buf, cmd_buf_len);
1023 if (ret_len < 0) {
1024 perror("[error] Error sending get_next_index cmd and request");
1025 goto error;
1026 }
1027 assert(ret_len == cmd_buf_len);
1028
1029 ret_len = lttng_live_recv(ctx->control_sock, rp, sizeof(*rp));
1030 if (ret_len == 0) {
1031 fprintf(stderr, "[error] Remote side has closed connection\n");
1032 goto error;
1033 }
1034 if (ret_len < 0) {
1035 perror("[error] Error receiving index response");
1036 goto error;
1037 }
1038 assert(ret_len == sizeof(*rp));
1039
1040 rp->flags = be32toh(rp->flags);
1041
1042 switch (be32toh(rp->status)) {
1043 case LTTNG_VIEWER_INDEX_INACTIVE:
1044 printf_verbose("get_next_index: inactive\n");
1045
1046 if (index->ts_cycles.timestamp_end ==
1047 be64toh(rp->timestamp_end)) {
1048 /* Already seen this timestamp. */
1049 (void) poll(NULL, 0, ACTIVE_POLL_DELAY);
1050 }
1051
1052 memset(index, 0, sizeof(struct packet_index));
1053 index->ts_cycles.timestamp_end = be64toh(rp->timestamp_end);
1054 *stream_id = be64toh(rp->stream_id);
1055 break;
1056 case LTTNG_VIEWER_INDEX_OK:
1057 printf_verbose("get_next_index: Ok, need metadata update : %u\n",
1058 rp->flags & LTTNG_VIEWER_FLAG_NEW_METADATA);
1059 lttng_index_to_packet_index(rp, index);
1060 *stream_id = be64toh(rp->stream_id);
1061 viewer_stream->data_pending = 1;
1062
1063 if (rp->flags & LTTNG_VIEWER_FLAG_NEW_METADATA) {
1064 ret = append_metadata(ctx, viewer_stream);
1065 if (ret)
1066 goto error;
1067 }
1068 if (rp->flags & LTTNG_VIEWER_FLAG_NEW_STREAM) {
1069 printf_verbose("get_next_index: need new streams\n");
1070 ret = ask_new_streams(ctx);
1071 if (ret < 0) {
1072 goto error;
1073 } else if (ret > 0) {
1074 ret = add_traces(ctx);
1075 if (ret < 0) {
1076 goto error;
1077 }
1078 }
1079 }
1080 break;
1081 case LTTNG_VIEWER_INDEX_RETRY:
1082 printf_verbose("get_next_index: retry\n");
1083 (void) poll(NULL, 0, ACTIVE_POLL_DELAY);
1084 goto retry;
1085 case LTTNG_VIEWER_INDEX_HUP:
1086 printf_verbose("get_next_index: stream hung up\n");
1087 viewer_stream->id = -1ULL;
1088 index->offset = EOF;
1089 ctx->session->stream_count--;
1090 break;
1091 case LTTNG_VIEWER_INDEX_ERR:
1092 fprintf(stderr, "[error] get_next_index: error\n");
1093 goto error;
1094 default:
1095 fprintf(stderr, "[error] get_next_index: unkwown value\n");
1096 goto error;
1097 }
1098 ret = 0;
1099 end:
1100 return ret;
1101
1102 error:
1103 return -1;
1104 }
1105
1106 static
1107 void read_packet_header(struct ctf_stream_pos *pos,
1108 struct ctf_file_stream *file_stream)
1109 {
1110 int ret;
1111
1112 /* update trace_packet_header and stream_packet_context */
1113 if (!(pos->prot & PROT_WRITE) &&
1114 file_stream->parent.trace_packet_header) {
1115 /* Read packet header */
1116 ret = generic_rw(&pos->parent,
1117 &file_stream->parent.trace_packet_header->p);
1118 if (ret) {
1119 pos->offset = EOF;
1120 fprintf(stderr, "[error] trace packet "
1121 "header read failed\n");
1122 goto end;
1123 }
1124 }
1125 if (!(pos->prot & PROT_WRITE) &&
1126 file_stream->parent.stream_packet_context) {
1127 /* Read packet context */
1128 ret = generic_rw(&pos->parent,
1129 &file_stream->parent.stream_packet_context->p);
1130 if (ret) {
1131 pos->offset = EOF;
1132 fprintf(stderr, "[error] stream packet "
1133 "context read failed\n");
1134 goto end;
1135 }
1136 }
1137 pos->data_offset = pos->offset;
1138
1139 end:
1140 return;
1141 }
1142
1143 /*
1144 * Handle the seek parameters.
1145 * Returns 0 if the packet_seek can continue, a positive value to
1146 * cleanly exit the packet_seek, a negative value on error.
1147 */
1148 static
1149 int handle_seek_position(size_t index, int whence,
1150 struct lttng_live_viewer_stream *viewer_stream,
1151 struct ctf_stream_pos *pos,
1152 struct ctf_file_stream *file_stream)
1153 {
1154 int ret = 0;
1155
1156 switch (whence) {
1157 case SEEK_CUR:
1158 ret = 0;
1159 goto end;
1160 case SEEK_SET:
1161 /*
1162 * We only allow to seek to 0.
1163 */
1164 if (index != 0) {
1165 fprintf(stderr, "[error] Arbitrary seek in lttng-live "
1166 "trace not supported\n");
1167 pos->offset = EOF;
1168 ret = -1;
1169 goto end;
1170 }
1171
1172 ret = 0;
1173 goto end;
1174
1175 default:
1176 fprintf(stderr, "[error] Invalid seek parameter\n");
1177 assert(0);
1178 }
1179
1180 end:
1181 return ret;
1182 }
1183
1184 static
1185 void ctf_live_packet_seek(struct bt_stream_pos *stream_pos, size_t index,
1186 int whence)
1187 {
1188 struct ctf_stream_pos *pos;
1189 struct ctf_file_stream *file_stream;
1190 struct packet_index *prev_index = NULL, *cur_index;
1191 struct lttng_live_viewer_stream *viewer_stream;
1192 struct lttng_live_session *session;
1193 uint64_t stream_id = -1ULL;
1194 int ret;
1195
1196 pos = ctf_pos(stream_pos);
1197 file_stream = container_of(pos, struct ctf_file_stream, pos);
1198 viewer_stream = (struct lttng_live_viewer_stream *) pos->priv;
1199 session = viewer_stream->session;
1200
1201 ret = handle_seek_position(index, whence, viewer_stream, pos,
1202 file_stream);
1203 if (ret != 0) {
1204 return;
1205 }
1206
1207 retry:
1208 switch (pos->packet_index->len) {
1209 case 0:
1210 g_array_set_size(pos->packet_index, 1);
1211 cur_index = &g_array_index(pos->packet_index,
1212 struct packet_index, 0);
1213 break;
1214 case 1:
1215 g_array_set_size(pos->packet_index, 2);
1216 prev_index = &g_array_index(pos->packet_index,
1217 struct packet_index, 0);
1218 cur_index = &g_array_index(pos->packet_index,
1219 struct packet_index, 1);
1220 break;
1221 case 2:
1222 g_array_index(pos->packet_index,
1223 struct packet_index, 0) =
1224 g_array_index(pos->packet_index,
1225 struct packet_index, 1);
1226 prev_index = &g_array_index(pos->packet_index,
1227 struct packet_index, 0);
1228 cur_index = &g_array_index(pos->packet_index,
1229 struct packet_index, 1);
1230 break;
1231 default:
1232 abort();
1233 break;
1234 }
1235
1236 if (viewer_stream->data_pending) {
1237 lttng_index_to_packet_index(&viewer_stream->current_index, cur_index);
1238 } else {
1239 printf_verbose("get_next_index for stream %" PRIu64 "\n", viewer_stream->id);
1240 ret = get_next_index(session->ctx, viewer_stream, cur_index, &stream_id);
1241 if (ret < 0) {
1242 pos->offset = EOF;
1243 if (!lttng_live_should_quit()) {
1244 fprintf(stderr, "[error] get_next_index failed\n");
1245 }
1246 return;
1247 }
1248 printf_verbose("Index received : packet_size : %" PRIu64
1249 ", offset %" PRIu64 ", content_size %" PRIu64
1250 ", timestamp_end : %" PRIu64 "\n",
1251 cur_index->packet_size, cur_index->offset,
1252 cur_index->content_size,
1253 cur_index->ts_cycles.timestamp_end);
1254
1255 }
1256
1257 /*
1258 * On the first time we receive an index, the stream_id needs to
1259 * be set for the stream in order to use it, we don't want any
1260 * data at this stage.
1261 */
1262 if (file_stream->parent.stream_id == -1ULL) {
1263 /*
1264 * Warning: with lttng-tools < 2.4.2, the beacon does not
1265 * contain the real stream ID, it is memset to 0, so this
1266 * might create a problem when a session has multiple
1267 * channels. We can't detect it at this stage, lttng-tools
1268 * has to be upgraded to fix this problem.
1269 */
1270 printf_verbose("Assigning stream_id %" PRIu64 "\n",
1271 stream_id);
1272 file_stream->parent.stream_id = stream_id;
1273 viewer_stream->ctf_stream_id = stream_id;
1274
1275 return;
1276 }
1277
1278 pos->packet_size = cur_index->packet_size;
1279 pos->content_size = cur_index->content_size;
1280 pos->mmap_base_offset = 0;
1281 if (cur_index->offset == EOF) {
1282 pos->offset = EOF;
1283 } else {
1284 pos->offset = 0;
1285 }
1286
1287 if (cur_index->content_size == 0) {
1288 /* Beacon packet index */
1289 if (file_stream->parent.stream_class) {
1290 file_stream->parent.cycles_timestamp =
1291 cur_index->ts_cycles.timestamp_end;
1292 file_stream->parent.real_timestamp = ctf_get_real_timestamp(
1293 &file_stream->parent,
1294 cur_index->ts_cycles.timestamp_end);
1295
1296 /*
1297 * Duplicate the data from the previous index, because
1298 * the one we just received is only a beacon with no
1299 * relevant information except the timestamp_end. We
1300 * don't need to keep this timestamp_end because we already
1301 * updated the file_stream timestamps, so we only need
1302 * to keep the last real index data as prev_index. That
1303 * way, we keep the original prev timestamps and
1304 * discarded events counter. This is the same behaviour
1305 * as if we were reading a local trace, we would not
1306 * have fake indexes between real indexes.
1307 */
1308 memcpy(cur_index, prev_index, sizeof(struct packet_index));
1309 }
1310 } else {
1311 /* Real packet index */
1312 if (file_stream->parent.stream_class) {
1313 /* Convert the timestamps and append to the real_index. */
1314 cur_index->ts_real.timestamp_begin = ctf_get_real_timestamp(
1315 &file_stream->parent,
1316 cur_index->ts_cycles.timestamp_begin);
1317 cur_index->ts_real.timestamp_end = ctf_get_real_timestamp(
1318 &file_stream->parent,
1319 cur_index->ts_cycles.timestamp_end);
1320 }
1321
1322 ctf_update_current_packet_index(&file_stream->parent,
1323 prev_index, cur_index);
1324
1325 /*
1326 * We need to check if we are in trace read or called
1327 * from packet indexing. In this last case, the
1328 * collection is not there, so we cannot print the
1329 * timestamps.
1330 */
1331 if ((&file_stream->parent)->stream_class->trace->parent.collection) {
1332 ctf_print_discarded_lost(stderr, &file_stream->parent);
1333 }
1334
1335 file_stream->parent.cycles_timestamp =
1336 cur_index->ts_cycles.timestamp_begin;
1337 file_stream->parent.real_timestamp =
1338 cur_index->ts_real.timestamp_begin;
1339 }
1340
1341 /*
1342 * Flush the output between attempts to grab a packet, thus
1343 * ensuring we flush at least at the periodical timer period.
1344 * This ensures the output remains reactive for interactive users and
1345 * that the output is flushed when redirected to a file by the shell.
1346 */
1347 if (fflush(LTTNG_LIVE_OUTPUT_FP) < 0) {
1348 perror("fflush");
1349 goto end;
1350 }
1351
1352 if (pos->packet_size == 0 || pos->offset == EOF) {
1353 goto end;
1354 }
1355
1356 printf_verbose("get_data_packet for stream %" PRIu64 "\n",
1357 viewer_stream->id);
1358 ret = get_data_packet(session->ctx, pos, viewer_stream,
1359 cur_index->offset,
1360 cur_index->packet_size / CHAR_BIT);
1361 if (ret == -2) {
1362 goto retry;
1363 } else if (ret < 0) {
1364 pos->offset = EOF;
1365 if (!lttng_live_should_quit()) {
1366 fprintf(stderr, "[error] get_data_packet failed\n");
1367 }
1368 return;
1369 }
1370 viewer_stream->data_pending = 0;
1371
1372 read_packet_header(pos, file_stream);
1373
1374 end:
1375 return;
1376 }
1377
1378 int lttng_live_create_viewer_session(struct lttng_live_ctx *ctx)
1379 {
1380 struct lttng_viewer_cmd cmd;
1381 struct lttng_viewer_create_session_response resp;
1382 int ret;
1383 ssize_t ret_len;
1384
1385 if (lttng_live_should_quit()) {
1386 ret = -1;
1387 goto end;
1388 }
1389
1390 cmd.cmd = htobe32(LTTNG_VIEWER_CREATE_SESSION);
1391 cmd.data_size = htobe64((uint64_t) 0);
1392 cmd.cmd_version = htobe32(0);
1393
1394 ret_len = lttng_live_send(ctx->control_sock, &cmd, sizeof(cmd));
1395 if (ret_len < 0) {
1396 perror("[error] Error sending cmd");
1397 goto error;
1398 }
1399 assert(ret_len == sizeof(cmd));
1400
1401 ret_len = lttng_live_recv(ctx->control_sock, &resp, sizeof(resp));
1402 if (ret_len == 0) {
1403 fprintf(stderr, "[error] Remote side has closed connection\n");
1404 goto error;
1405 }
1406 if (ret_len < 0) {
1407 perror("[error] Error receiving create session reply");
1408 goto error;
1409 }
1410 assert(ret_len == sizeof(resp));
1411
1412 if (be32toh(resp.status) != LTTNG_VIEWER_CREATE_SESSION_OK) {
1413 fprintf(stderr, "[error] Error creating viewer session\n");
1414 goto error;
1415 }
1416 ret = 0;
1417 end:
1418 return ret;
1419
1420 error:
1421 return -1;
1422 }
1423
1424 static
1425 int del_traces(gpointer key, gpointer value, gpointer user_data)
1426 {
1427 struct bt_context *bt_ctx = user_data;
1428 struct lttng_live_ctf_trace *trace = value;
1429 int ret;
1430
1431 ret = bt_context_remove_trace(bt_ctx, trace->trace_id);
1432 if (ret < 0)
1433 fprintf(stderr, "[error] removing trace from context\n");
1434
1435 /* remove the key/value pair from the HT. */
1436 return 1;
1437 }
1438
1439 static
1440 int add_one_trace(struct lttng_live_ctx *ctx,
1441 struct lttng_live_ctf_trace *trace)
1442 {
1443 int i, ret;
1444 struct bt_context *bt_ctx = ctx->bt_ctx;
1445 struct lttng_live_viewer_stream *stream;
1446 struct bt_mmap_stream *new_mmap_stream;
1447 struct bt_mmap_stream_list mmap_list;
1448 struct bt_trace_descriptor *td;
1449 struct bt_trace_handle *handle;
1450
1451 /*
1452 * We don't know how many streams we will receive for a trace, so
1453 * once we are done receiving the traces, we add all the traces
1454 * received to the bt_context.
1455 * We can receive streams during the attach command or the
1456 * get_new_streams, so we have to make sure not to add multiple
1457 * times the same traces.
1458 * If a trace is already in the context, we just skip this function.
1459 */
1460 if (trace->in_use) {
1461 ret = 0;
1462 goto end;
1463 }
1464
1465 BT_INIT_LIST_HEAD(&mmap_list.head);
1466
1467 for (i = 0; i < trace->streams->len; i++) {
1468 stream = g_ptr_array_index(trace->streams, i);
1469
1470 if (!stream->metadata_flag) {
1471 new_mmap_stream = zmalloc(sizeof(struct bt_mmap_stream));
1472 new_mmap_stream->priv = (void *) stream;
1473 new_mmap_stream->fd = -1;
1474 bt_list_add(&new_mmap_stream->list, &mmap_list.head);
1475 } else {
1476 char *metadata_buf = NULL;
1477
1478 /* Get all possible metadata before starting */
1479 ret = get_new_metadata(ctx, stream, &metadata_buf);
1480 if (ret) {
1481 free(metadata_buf);
1482 goto end_free;
1483 }
1484 if (!stream->metadata_len) {
1485 fprintf(stderr, "[error] empty metadata\n");
1486 ret = -1;
1487 free(metadata_buf);
1488 goto end_free;
1489 }
1490
1491 trace->metadata_fp = babeltrace_fmemopen(metadata_buf,
1492 stream->metadata_len, "rb");
1493 if (!trace->metadata_fp) {
1494 perror("Metadata fmemopen");
1495 ret = -1;
1496 free(metadata_buf);
1497 goto end_free;
1498 }
1499 }
1500 }
1501
1502 if (!trace->metadata_fp) {
1503 fprintf(stderr, "[error] No metadata stream opened\n");
1504 ret = -1;
1505 goto end_free;
1506 }
1507
1508 ret = bt_context_add_trace(bt_ctx, NULL, "ctf",
1509 ctf_live_packet_seek, &mmap_list, trace->metadata_fp);
1510 if (ret < 0) {
1511 fprintf(stderr, "[error] Error adding trace\n");
1512 ret = -1;
1513 goto end_free;
1514 }
1515 trace->metadata_stream->metadata_len = 0;
1516
1517 handle = (struct bt_trace_handle *) g_hash_table_lookup(
1518 bt_ctx->trace_handles,
1519 (gpointer) (unsigned long) ret);
1520 td = handle->td;
1521 trace->handle = handle;
1522 if (bt_ctx->current_iterator) {
1523 bt_iter_add_trace(bt_ctx->current_iterator, td);
1524 }
1525
1526 trace->trace_id = ret;
1527 trace->in_use = 1;
1528
1529 goto end;
1530
1531 end_free:
1532 bt_context_put(bt_ctx);
1533 end:
1534 return ret;
1535 }
1536
1537 static
1538 int add_traces(struct lttng_live_ctx *ctx)
1539 {
1540 int ret;
1541 struct lttng_live_ctf_trace *trace;
1542 GHashTableIter it;
1543 gpointer key;
1544 gpointer value;
1545
1546 g_hash_table_iter_init(&it, ctx->session->ctf_traces);
1547 while (g_hash_table_iter_next(&it, &key, &value)) {
1548 trace = (struct lttng_live_ctf_trace *) value;
1549 ret = add_one_trace(ctx, trace);
1550 if (ret < 0) {
1551 goto end;
1552 }
1553 }
1554
1555 ret = 0;
1556
1557 end:
1558 return ret;
1559 }
1560
1561 /*
1562 * Request new streams for a session.
1563 * Returns the number of streams received or a negative value on error.
1564 */
1565 int lttng_live_get_new_streams(struct lttng_live_ctx *ctx, uint64_t id)
1566 {
1567 struct lttng_viewer_cmd cmd;
1568 struct lttng_viewer_new_streams_request rq;
1569 struct lttng_viewer_new_streams_response rp;
1570 struct lttng_viewer_stream stream;
1571 int ret, i, nb_streams = 0;
1572 ssize_t ret_len;
1573 uint32_t stream_count;
1574 const size_t cmd_buf_len = sizeof(cmd) + sizeof(rq);
1575 char cmd_buf[cmd_buf_len];
1576
1577 if (lttng_live_should_quit()) {
1578 ret = -1;
1579 goto end;
1580 }
1581
1582 cmd.cmd = htobe32(LTTNG_VIEWER_GET_NEW_STREAMS);
1583 cmd.data_size = htobe64((uint64_t) sizeof(rq));
1584 cmd.cmd_version = htobe32(0);
1585
1586 memset(&rq, 0, sizeof(rq));
1587 rq.session_id = htobe64(id);
1588
1589 /*
1590 * Merge the cmd and connection request to prevent a write-write
1591 * sequence on the TCP socket. Otherwise, a delayed ACK will prevent the
1592 * second write to be performed quickly in presence of Nagle's algorithm.
1593 */
1594 memcpy(cmd_buf, &cmd, sizeof(cmd));
1595 memcpy(cmd_buf + sizeof(cmd), &rq, sizeof(rq));
1596
1597 ret_len = lttng_live_send(ctx->control_sock, cmd_buf, cmd_buf_len);
1598 if (ret_len < 0) {
1599 perror("[error] Error sending get_new_streams cmd and request");
1600 goto error;
1601 }
1602 assert(ret_len == cmd_buf_len);
1603
1604 ret_len = lttng_live_recv(ctx->control_sock, &rp, sizeof(rp));
1605 if (ret_len == 0) {
1606 fprintf(stderr, "[error] Remote side has closed connection\n");
1607 goto error;
1608 }
1609 if (ret_len < 0) {
1610 perror("[error] Error receiving get_new_streams response");
1611 goto error;
1612 }
1613 assert(ret_len == sizeof(rp));
1614
1615 switch(be32toh(rp.status)) {
1616 case LTTNG_VIEWER_NEW_STREAMS_OK:
1617 break;
1618 case LTTNG_VIEWER_NEW_STREAMS_NO_NEW:
1619 ret = 0;
1620 goto end;
1621 case LTTNG_VIEWER_NEW_STREAMS_HUP:
1622 ret = -LTTNG_VIEWER_NEW_STREAMS_HUP;
1623 goto end;
1624 case LTTNG_VIEWER_NEW_STREAMS_ERR:
1625 fprintf(stderr, "[error] get_new_streams error\n");
1626 goto error;
1627 default:
1628 fprintf(stderr, "[error] Unknown return code %u\n",
1629 be32toh(rp.status));
1630 goto error;
1631 }
1632
1633 stream_count = be32toh(rp.streams_count);
1634 ctx->session->stream_count += stream_count;
1635 /*
1636 * When the session is created but not started, we do an active wait
1637 * until it starts. It allows the viewer to start processing the trace
1638 * as soon as the session starts.
1639 */
1640 if (ctx->session->stream_count == 0) {
1641 ret = 0;
1642 goto end;
1643 }
1644 printf_verbose("Waiting for %" PRIu64 " streams:\n",
1645 ctx->session->stream_count);
1646 ctx->session->streams = g_new0(struct lttng_live_viewer_stream,
1647 ctx->session->stream_count);
1648 for (i = 0; i < stream_count; i++) {
1649 ret_len = lttng_live_recv(ctx->control_sock, &stream, sizeof(stream));
1650 if (ret_len == 0) {
1651 fprintf(stderr, "[error] Remote side has closed connection\n");
1652 goto error;
1653 }
1654 if (ret_len < 0) {
1655 perror("[error] Error receiving stream");
1656 goto error;
1657 }
1658 assert(ret_len == sizeof(stream));
1659 stream.path_name[LTTNG_VIEWER_PATH_MAX - 1] = '\0';
1660 stream.channel_name[LTTNG_VIEWER_NAME_MAX - 1] = '\0';
1661
1662 printf_verbose(" stream %" PRIu64 " : %s/%s\n",
1663 be64toh(stream.id), stream.path_name,
1664 stream.channel_name);
1665 ctx->session->streams[i].id = be64toh(stream.id);
1666 ctx->session->streams[i].session = ctx->session;
1667
1668 ctx->session->streams[i].mmap_size = 0;
1669 ctx->session->streams[i].ctf_stream_id = -1ULL;
1670
1671 if (be32toh(stream.metadata_flag)) {
1672 ctx->session->streams[i].metadata_flag = 1;
1673 }
1674 ret = lttng_live_ctf_trace_assign(&ctx->session->streams[i],
1675 be64toh(stream.ctf_trace_id));
1676 if (ret < 0) {
1677 goto error;
1678 }
1679 nb_streams++;
1680
1681 }
1682 ret = nb_streams;
1683 end:
1684 return ret;
1685
1686 error:
1687 return -1;
1688 }
1689
1690 int lttng_live_read(struct lttng_live_ctx *ctx)
1691 {
1692 int ret = -1;
1693 int i;
1694 struct bt_ctf_iter *iter;
1695 const struct bt_ctf_event *event;
1696 struct bt_iter_pos begin_pos;
1697 struct bt_trace_descriptor *td_write;
1698 struct bt_format *fmt_write;
1699 struct ctf_text_stream_pos *sout;
1700 uint64_t id;
1701
1702 ctx->bt_ctx = bt_context_create();
1703 if (!ctx->bt_ctx) {
1704 fprintf(stderr, "[error] bt_context_create allocation\n");
1705 goto end;
1706 }
1707
1708 fmt_write = bt_lookup_format(g_quark_from_static_string("text"));
1709 if (!fmt_write) {
1710 fprintf(stderr, "[error] ctf-text error\n");
1711 goto end;
1712 }
1713
1714 td_write = fmt_write->open_trace(NULL, O_RDWR, NULL, NULL);
1715 if (!td_write) {
1716 fprintf(stderr, "[error] Error opening output trace\n");
1717 goto end_free;
1718 }
1719
1720 sout = container_of(td_write, struct ctf_text_stream_pos,
1721 trace_descriptor);
1722 if (!sout->parent.event_cb) {
1723 goto end_free;
1724 }
1725
1726 ret = lttng_live_create_viewer_session(ctx);
1727 if (ret < 0) {
1728 goto end_free;
1729 }
1730
1731 for (i = 0; i < ctx->session_ids->len; i++) {
1732 id = g_array_index(ctx->session_ids, uint64_t, i);
1733 printf_verbose("Attaching to session %" PRIu64 "\n", id);
1734 ret = lttng_live_attach_session(ctx, id);
1735 printf_verbose("Attaching session returns %d\n", ret);
1736 if (ret < 0) {
1737 if (ret == -LTTNG_VIEWER_ATTACH_UNK) {
1738 fprintf(stderr, "[error] Unknown session ID\n");
1739 }
1740 goto end_free;
1741 }
1742 }
1743
1744 /*
1745 * As long as the session is active, we try to get new streams.
1746 */
1747 for (;;) {
1748 int flags;
1749
1750 if (lttng_live_should_quit()) {
1751 ret = 0;
1752 goto end_free;
1753 }
1754
1755 while (!ctx->session->stream_count) {
1756 if (lttng_live_should_quit()
1757 || ctx->session_ids->len == 0) {
1758 ret = 0;
1759 goto end_free;
1760 }
1761 ret = ask_new_streams(ctx);
1762 if (ret < 0) {
1763 ret = 0;
1764 goto end_free;
1765 }
1766 if (!ctx->session->stream_count) {
1767 (void) poll(NULL, 0, ACTIVE_POLL_DELAY);
1768 }
1769 }
1770
1771 ret = add_traces(ctx);
1772 if (ret < 0) {
1773 goto end_free;
1774 }
1775
1776 begin_pos.type = BT_SEEK_BEGIN;
1777 iter = bt_ctf_iter_create(ctx->bt_ctx, &begin_pos, NULL);
1778 if (!iter) {
1779 if (lttng_live_should_quit()) {
1780 ret = 0;
1781 goto end;
1782 }
1783 fprintf(stderr, "[error] Iterator creation error\n");
1784 goto end;
1785 }
1786 for (;;) {
1787 if (lttng_live_should_quit()) {
1788 ret = 0;
1789 goto end_free;
1790 }
1791 event = bt_ctf_iter_read_event_flags(iter, &flags);
1792 if (!(flags & BT_ITER_FLAG_RETRY)) {
1793 if (!event) {
1794 /* End of trace */
1795 break;
1796 }
1797 ret = sout->parent.event_cb(&sout->parent,
1798 event->parent->stream);
1799 if (ret) {
1800 fprintf(stderr, "[error] Writing "
1801 "event failed.\n");
1802 goto end_free;
1803 }
1804 }
1805 ret = bt_iter_next(bt_ctf_get_iter(iter));
1806 if (ret < 0) {
1807 goto end_free;
1808 }
1809 }
1810 bt_ctf_iter_destroy(iter);
1811 g_hash_table_foreach_remove(ctx->session->ctf_traces,
1812 del_traces, ctx->bt_ctx);
1813 ctx->session->stream_count = 0;
1814 }
1815
1816 end_free:
1817 bt_context_put(ctx->bt_ctx);
1818 end:
1819 if (lttng_live_should_quit()) {
1820 ret = 0;
1821 }
1822 return ret;
1823 }
BabelTrace - Trace Format Babel Tower
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