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lttng-live input plugin
[babeltrace.git] / formats / lttng-live / lttng-live-functions.c
CommitLineData
4a744367
JD		 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 <string.h>
30#include <stdlib.h>
31#include <unistd.h>
32#include <errno.h>
33#include <inttypes.h>
34#include <fcntl.h>
35#include <sys/mman.h>
36
37#include <babeltrace/ctf/ctf-index.h>
38
39#include <babeltrace/babeltrace.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 "lttng-live-functions.h"
53#include "lttng-viewer.h"
54
55/*
56 * Memory allocation zeroed
57 */
58#define zmalloc(x) calloc(1, x)
59
60#ifndef max_t
61#define max_t(type, a, b) \
62 ((type) (a) > (type) (b) ? (type) (a) : (type) (b))
63#endif
64
65int lttng_live_connect_viewer(struct lttng_live_ctx *ctx, char *hostname,
66 int port)
67{
68 struct hostent *host;
69 struct sockaddr_in server_addr;
70 int ret;
71
72 host = gethostbyname(hostname);
73 if (!host) {
74 ret = -1;
75 goto end;
76 }
77
78 if ((ctx->control_sock = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
79 perror("Socket");
80 ret = -1;
81 goto end;
82 }
83
84 server_addr.sin_family = AF_INET;
85 server_addr.sin_port = htons(port);
86 server_addr.sin_addr = *((struct in_addr *) host->h_addr);
87 bzero(&(server_addr.sin_zero), 8);
88
89 if (connect(ctx->control_sock, (struct sockaddr *) &server_addr,
90 sizeof(struct sockaddr)) == -1) {
91 perror("Connect");
92 ret = -1;
93 goto end;
94 }
95
96 ret = 0;
97
98end:
99 return ret;
100}
101
102int lttng_live_establish_connection(struct lttng_live_ctx *ctx)
103{
104 struct lttng_viewer_cmd cmd;
105 struct lttng_viewer_connect connect;
106 int ret;
107 ssize_t ret_len;
108
109 cmd.cmd = htobe32(LTTNG_VIEWER_CONNECT);
110 cmd.data_size = sizeof(connect);
111 cmd.cmd_version = 0;
112
113 connect.major = htobe32(LTTNG_LIVE_MAJOR);
114 connect.minor = htobe32(LTTNG_LIVE_MINOR);
115 connect.type = htobe32(LTTNG_VIEWER_CLIENT_COMMAND);
116
117 do {
118 ret_len = send(ctx->control_sock, &cmd, sizeof(cmd), 0);
119 } while (ret_len < 0 && errno == EINTR);
120 if (ret_len < 0) {
121 fprintf(stderr, "[error] Error sending cmd\n");
122 ret = ret_len;
123 goto error;
124 }
125 assert(ret_len == sizeof(cmd));
126
127 do {
128 ret_len = send(ctx->control_sock, &connect, sizeof(connect), 0);
129 } while (ret_len < 0 && errno == EINTR);
130 if (ret_len < 0) {
131 fprintf(stderr, "[error] Error sending version\n");
132 ret = ret_len;
133 goto error;
134 }
135 assert(ret_len == sizeof(connect));
136
137 do {
138 ret_len = recv(ctx->control_sock, &connect, sizeof(connect), 0);
139 } while (ret_len < 0 && errno == EINTR);
140 if (ret_len < 0) {
141 fprintf(stderr, "[error] Error receiving version\n");
142 ret = ret_len;
143 goto error;
144 }
145 assert(ret_len == sizeof(connect));
146
147 printf_verbose("Received viewer session ID : %" PRIu64 "\n",
148 be64toh(connect.viewer_session_id));
149 printf_verbose("Relayd version : %u.%u\n", be32toh(connect.major),
150 be32toh(connect.minor));
151
152 ret = 0;
153
154error:
155 return ret;
156}
157
158int lttng_live_list_sessions(struct lttng_live_ctx *ctx, const char *path)
159{
160 struct lttng_viewer_cmd cmd;
161 struct lttng_viewer_list_sessions list;
162 struct lttng_viewer_session lsession;
163 int i, ret;
164 ssize_t ret_len;
165 int sessions_count;
166
167 cmd.cmd = htobe32(LTTNG_VIEWER_LIST_SESSIONS);
168 cmd.data_size = 0;
169 cmd.cmd_version = 0;
170
171 do {
172 ret_len = send(ctx->control_sock, &cmd, sizeof(cmd), 0);
173 } while (ret_len < 0 && errno == EINTR);
174 if (ret_len < 0) {
175 fprintf(stderr, "[error] Error sending cmd\n");
176 ret = ret_len;
177 goto error;
178 }
179 assert(ret_len == sizeof(cmd));
180
181 do {
182 ret_len = recv(ctx->control_sock, &list, sizeof(list), 0);
183 } while (ret_len < 0 && errno == EINTR);
184 if (ret_len < 0) {
185 fprintf(stderr, "[error] Error receiving session list\n");
186 ret = ret_len;
187 goto error;
188 }
189 assert(ret_len == sizeof(list));
190
191 sessions_count = be32toh(list.sessions_count);
192 fprintf(stdout, "%u active session(s)%c\n", sessions_count,
193 sessions_count > 0 ? ':' : ' ');
194 for (i = 0; i < sessions_count; i++) {
195 do {
196 ret_len = recv(ctx->control_sock, &lsession, sizeof(lsession), 0);
197 } while (ret_len < 0 && errno == EINTR);
198 if (ret_len < 0) {
199 fprintf(stderr, "[error] Error receiving session\n");
200 ret = ret_len;
201 goto error;
202 }
203 assert(ret_len == sizeof(lsession));
204
205 fprintf(stdout, "%s/%" PRIu64 " : %s on host %s (timer = %u, "
206 "%u stream(s), %u client(s) connected)\n",
207 path, be64toh(lsession.id),
208 lsession.session_name, lsession.hostname,
209 be32toh(lsession.live_timer),
210 be32toh(lsession.streams),
211 be32toh(lsession.clients));
212 }
213
214 ret = 0;
215
216error:
217 return ret;
218}
219
220int lttng_live_ctf_trace_assign(struct lttng_live_viewer_stream *stream,
221 uint64_t ctf_trace_id)
222{
223 struct lttng_live_ctf_trace *trace;
224 int ret = 0;
225
226 trace = g_hash_table_lookup(stream->session->ctf_traces,
227 (gpointer) ctf_trace_id);
228 if (!trace) {
229 trace = g_new0(struct lttng_live_ctf_trace, 1);
230 if (!trace) {
231 ret = -1;
232 fprintf(stderr, "[error] ctf_trace allocation\n");
233 goto error;
234 }
235 trace->ctf_trace_id = ctf_trace_id;
236 trace->streams = g_ptr_array_new();
237 g_hash_table_insert(stream->session->ctf_traces,
238 (gpointer) ctf_trace_id,
239 trace);
240 }
241 if (stream->metadata_flag)
242 trace->metadata_stream = stream;
243
244 stream->ctf_trace = trace;
245 g_ptr_array_add(trace->streams, stream);
246
247error:
248 return ret;
249}
250
251int lttng_live_attach_session(struct lttng_live_ctx *ctx, uint64_t id)
252{
253 struct lttng_viewer_cmd cmd;
254 struct lttng_viewer_attach_session_request rq;
255 struct lttng_viewer_attach_session_response rp;
256 struct lttng_viewer_stream stream;
257 int ret, i;
258 ssize_t ret_len;
259
260 cmd.cmd = htobe32(LTTNG_VIEWER_ATTACH_SESSION);
261 cmd.data_size = sizeof(rq);
262 cmd.cmd_version = 0;
263
264 memset(&rq, 0, sizeof(rq));
265 rq.session_id = htobe64(id);
266 // TODO: add cmd line parameter to select seek beginning
267 // rq.seek = htobe32(LTTNG_VIEWER_SEEK_BEGINNING);
268 rq.seek = htobe32(LTTNG_VIEWER_SEEK_LAST);
269
270 do {
271 ret_len = send(ctx->control_sock, &cmd, sizeof(cmd), 0);
272 } while (ret_len < 0 && errno == EINTR);
273 if (ret_len < 0) {
274 fprintf(stderr, "[error] Error sending cmd\n");
275 ret = ret_len;
276 goto error;
277 }
278 assert(ret_len == sizeof(cmd));
279
280 do {
281 ret_len = send(ctx->control_sock, &rq, sizeof(rq), 0);
282 } while (ret_len < 0 && errno == EINTR);
283 if (ret_len < 0) {
284 fprintf(stderr, "[error] Error sending attach request\n");
285 ret = ret_len;
286 goto error;
287 }
288 assert(ret_len == sizeof(rq));
289
290 do {
291 ret_len = recv(ctx->control_sock, &rp, sizeof(rp), 0);
292 } while (ret_len < 0 && errno == EINTR);
293 if (ret_len < 0) {
294 fprintf(stderr, "[error] Error receiving attach response\n");
295 ret = ret_len;
296 goto error;
297 }
298 assert(ret_len == sizeof(rp));
299
300 switch(be32toh(rp.status)) {
301 case LTTNG_VIEWER_ATTACH_OK:
302 break;
303 case LTTNG_VIEWER_ATTACH_UNK:
304 ret = -LTTNG_VIEWER_ATTACH_UNK;
305 goto end;
306 case LTTNG_VIEWER_ATTACH_ALREADY:
307 fprintf(stderr, "[error] Already a viewer attached\n");
308 ret = -1;
309 goto end;
310 case LTTNG_VIEWER_ATTACH_NOT_LIVE:
311 fprintf(stderr, "[error] Not a live session\n");
312 ret = -1;
313 goto end;
314 case LTTNG_VIEWER_ATTACH_SEEK_ERR:
315 fprintf(stderr, "[error] Wrong seek parameter\n");
316 ret = -1;
317 goto end;
318 default:
319 fprintf(stderr, "[error] Unknown attach return code %u\n",
320 be32toh(rp.status));
321 ret = -1;
322 goto end;
323 }
324 if (be32toh(rp.status) != LTTNG_VIEWER_ATTACH_OK) {
325 ret = -1;
326 goto end;
327 }
328
329 ctx->session->stream_count = be32toh(rp.streams_count);
330 /*
331 * When the session is created but not started, we do an active wait
332 * until it starts. It allows the viewer to start processing the trace
333 * as soon as the session starts.
334 */
335 if (ctx->session->stream_count == 0) {
336 ret = 0;
337 goto end;
338 }
339 printf_verbose("Waiting for %" PRIu64 " streams:\n",
340 ctx->session->stream_count);
341 ctx->session->streams = g_new0(struct lttng_live_viewer_stream,
342 ctx->session->stream_count);
343 if (!ctx->session->streams) {
344 ret = -1;
345 goto error;
346 }
347
348 for (i = 0; i < be32toh(rp.streams_count); i++) {
349 do {
350 ret_len = recv(ctx->control_sock, &stream, sizeof(stream), 0);
351 } while (ret_len < 0 && errno == EINTR);
352 if (ret_len < 0) {
353 fprintf(stderr, "[error] Error receiving stream\n");
354 ret = ret_len;
355 goto error;
356 }
357 assert(ret_len == sizeof(stream));
358
359 printf_verbose(" stream %" PRIu64 " : %s/%s\n",
360 be64toh(stream.id), stream.path_name,
361 stream.channel_name);
362 ctx->session->streams[i].id = be64toh(stream.id);
363 ctx->session->streams[i].session = ctx->session;
364
365 ctx->session->streams[i].first_read = 1;
366 ctx->session->streams[i].mmap_size = 0;
367
368 if (be32toh(stream.metadata_flag)) {
369 char *path;
370
371 path = strdup(LTTNG_METADATA_PATH_TEMPLATE);
372 path = mkdtemp(path);
373 ctx->session->streams[i].metadata_flag = 1;
374 mkdir(path, S_IRWXU | S_IRWXG);
375 snprintf(ctx->session->streams[i].path,
376 sizeof(ctx->session->streams[i].path),
377 "%s/%s", path,
378 stream.channel_name);
379 ret = open(ctx->session->streams[i].path,
380 O_WRONLY | O_CREAT | O_TRUNC,
381 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
382 if (ret < 0) {
383 goto error;
384 }
385 ctx->session->streams[i].fd = ret;
386 }
387 ret = lttng_live_ctf_trace_assign(&ctx->session->streams[i],
388 be64toh(stream.ctf_trace_id));
389 if (ret < 0) {
390 goto error;
391 }
392
393 }
394 ret = 0;
395
396end:
397error:
398 return ret;
399}
400
401static
402int get_data_packet(struct lttng_live_ctx *ctx,
403 struct ctf_stream_pos *pos,
404 struct lttng_live_viewer_stream *stream, uint64_t offset,
405 uint64_t len)
406{
407 struct lttng_viewer_cmd cmd;
408 struct lttng_viewer_get_packet rq;
409 struct lttng_viewer_trace_packet rp;
410 ssize_t ret_len;
411 int ret;
412
413 cmd.cmd = htobe32(LTTNG_VIEWER_GET_PACKET);
414 cmd.data_size = sizeof(rq);
415 cmd.cmd_version = 0;
416
417 memset(&rq, 0, sizeof(rq));
418 rq.stream_id = htobe64(stream->id);
419 /* Already in big endian. */
420 rq.offset = offset;
421 rq.len = htobe32(len);
422
423 do {
424 ret_len = send(ctx->control_sock, &cmd, sizeof(cmd), 0);
425 } while (ret_len < 0 && errno == EINTR);
426 if (ret_len < 0) {
427 fprintf(stderr, "[error] Error sending cmd\n");
428 ret = ret_len;
429 goto error;
430 }
431 assert(ret_len == sizeof(cmd));
432
433 do {
434 ret_len = send(ctx->control_sock, &rq, sizeof(rq), 0);
435 } while (ret_len < 0 && errno == EINTR);
436 if (ret_len < 0) {
437 fprintf(stderr, "[error] Error sending get_data_packet request\n");
438 ret = ret_len;
439 goto error;
440 }
441 assert(ret_len == sizeof(rq));
442
443 do {
444 ret_len = recv(ctx->control_sock, &rp, sizeof(rp), 0);
445 } while (ret_len < 0 && errno == EINTR);
446 if (ret_len < 0) {
447 fprintf(stderr, "[error] Error receiving data response\n");
448 ret = ret_len;
449 goto error;
450 }
451 assert(ret_len == sizeof(rp));
452
453 rp.flags = be32toh(rp.flags);
454
455 switch (be32toh(rp.status)) {
456 case LTTNG_VIEWER_GET_PACKET_OK:
457 len = be32toh(rp.len);
458 printf_verbose("get_data_packet: Ok, packet size : %" PRIu64
459 "\n", len);
460 break;
461 case LTTNG_VIEWER_GET_PACKET_RETRY:
462 printf_verbose("get_data_packet: retry\n");
463 ret = -1;
464 goto end;
465 case LTTNG_VIEWER_GET_PACKET_ERR:
466 if (rp.flags & LTTNG_VIEWER_FLAG_NEW_METADATA) {
467 printf_verbose("get_data_packet: new metadata needed\n");
468 ret = 0;
469 goto end;
470 }
471 fprintf(stderr, "[error] get_data_packet: error\n");
472 ret = -1;
473 goto end;
474 case LTTNG_VIEWER_GET_PACKET_EOF:
475 ret = -2;
476 goto error;
477 default:
478 printf_verbose("get_data_packet: unknown\n");
479 assert(0);
480 ret = -1;
481 goto end;
482 }
483
484 if (len <= 0) {
485 ret = -1;
486 goto end;
487 }
488
489 if (len > stream->mmap_size) {
490 uint64_t new_size;
491
492 new_size = max_t(uint64_t, len, stream->mmap_size << 1);
493 if (pos->base_mma) {
494 /* unmap old base */
495 ret = munmap_align(pos->base_mma);
496 if (ret) {
497 fprintf(stderr, "[error] Unable to unmap old base: %s.\n",
498 strerror(errno));
499 ret = -1;
500 goto error;
501 }
502 pos->base_mma = NULL;
503 }
504 pos->base_mma = mmap_align(new_size,
505 PROT_READ | PROT_WRITE,
506 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
507 if (pos->base_mma == MAP_FAILED) {
508 fprintf(stderr, "[error] mmap error %s.\n",
509 strerror(errno));
510 pos->base_mma = NULL;
511 ret = -1;
512 goto error;
513 }
514
515 stream->mmap_size = new_size;
516 printf_verbose("Expanding stream mmap size to %" PRIu64 " bytes\n",
517 stream->mmap_size);
518 }
519
520 do {
521 ret_len = recv(ctx->control_sock,
522 mmap_align_addr(pos->base_mma), len,
523 MSG_WAITALL);
524 } while (ret_len < 0 && errno == EINTR);
525 if (ret_len < 0) {
526 fprintf(stderr, "[error] Error receiving trace packet\n");
527 ret = ret_len;
528 goto error;
529 }
530 assert(ret_len == len);
531
532end:
533error:
534 return ret;
535}
536
537/*
538 * Return number of metadata bytes written or a negative value on error.
539 */
540static
541int get_new_metadata(struct lttng_live_ctx *ctx,
542 struct lttng_live_viewer_stream *viewer_stream,
543 uint64_t *metadata_len)
544{
545 uint64_t len = 0;
546 int ret;
547 struct lttng_viewer_cmd cmd;
548 struct lttng_viewer_get_metadata rq;
549 struct lttng_viewer_metadata_packet rp;
550 struct lttng_live_viewer_stream *metadata_stream;
551 char *data = NULL;
552 ssize_t ret_len;
553
554 cmd.cmd = htobe32(LTTNG_VIEWER_GET_METADATA);
555 cmd.data_size = sizeof(rq);
556 cmd.cmd_version = 0;
557
558 metadata_stream = viewer_stream->ctf_trace->metadata_stream;
559 rq.stream_id = htobe64(metadata_stream->id);
560
561 do {
562 ret_len = send(ctx->control_sock, &cmd, sizeof(cmd), 0);
563 } while (ret_len < 0 && errno == EINTR);
564 if (ret_len < 0) {
565 fprintf(stderr, "[error] Error sending cmd\n");
566 ret = ret_len;
567 goto error;
568 }
569 assert(ret_len == sizeof(cmd));
570
571 do {
572 ret_len = send(ctx->control_sock, &rq, sizeof(rq), 0);
573 } while (ret_len < 0 && errno == EINTR);
574 if (ret_len < 0) {
575 fprintf(stderr, "[error] Error sending get_metadata request\n");
576 ret = ret_len;
577 goto error;
578 }
579 assert(ret_len == sizeof(rq));
580
581 do {
582 ret_len = recv(ctx->control_sock, &rp, sizeof(rp), 0);
583 } while (ret_len < 0 && errno == EINTR);
584 if (ret_len < 0) {
585 fprintf(stderr, "[error] Error receiving metadata response\n");
586 ret = ret_len;
587 goto error;
588 }
589 assert(ret_len == sizeof(rp));
590
591 switch (be32toh(rp.status)) {
592 case LTTNG_VIEWER_METADATA_OK:
593 printf_verbose("get_metadata : OK\n");
594 break;
595 case LTTNG_VIEWER_NO_NEW_METADATA:
596 printf_verbose("get_metadata : NO NEW\n");
597 ret = -1;
598 goto end;
599 case LTTNG_VIEWER_METADATA_ERR:
600 printf_verbose("get_metadata : ERR\n");
601 ret = -1;
602 goto end;
603 default:
604 printf_verbose("get_metadata : UNKNOWN\n");
605 ret = -1;
606 goto end;
607 }
608
609 len = be64toh(rp.len);
610 printf_verbose("Writing %" PRIu64" bytes to metadata\n", len);
611 if (len <= 0) {
612 ret = -1;
613 goto end;
614 }
615
616 data = zmalloc(len);
617 if (!data) {
618 perror("relay data zmalloc");
619 ret = -1;
620 goto error;
621 }
622 do {
623 ret_len = recv(ctx->control_sock, data, len, MSG_WAITALL);
624 } while (ret_len < 0 && errno == EINTR);
625 if (ret_len < 0) {
626 fprintf(stderr, "[error] Error receiving trace packet\n");
627 ret = ret_len;
628 free(data);
629 goto error;
630 }
631 assert(ret_len == len);
632
633 do {
634 ret_len = write(metadata_stream->fd, data, len);
635 } while (ret_len < 0 && errno == EINTR);
636 if (ret_len < 0) {
637 free(data);
638 ret = ret_len;
639 goto error;
640 }
641 assert(ret_len == len);
642
643 free(data);
644
645 *metadata_len = len;
646 ret = 0;
647end:
648error:
649 return ret;
650}
651
652/*
653 * Get one index for a stream.
654 *
655 * Returns 0 on success or a negative value on error.
656 */
657static
658int get_next_index(struct lttng_live_ctx *ctx,
659 struct lttng_live_viewer_stream *viewer_stream,
660 struct packet_index *index)
661{
662 struct lttng_viewer_cmd cmd;
663 struct lttng_viewer_get_next_index rq;
664 struct lttng_viewer_index rp;
665 int ret;
666 uint64_t metadata_len;
667 ssize_t ret_len;
668
669 cmd.cmd = htobe32(LTTNG_VIEWER_GET_NEXT_INDEX);
670 cmd.data_size = sizeof(rq);
671 cmd.cmd_version = 0;
672
673 memset(&rq, 0, sizeof(rq));
674 rq.stream_id = htobe64(viewer_stream->id);
675
676retry:
677 do {
678 ret_len = send(ctx->control_sock, &cmd, sizeof(cmd), 0);
679 } while (ret_len < 0 && errno == EINTR);
680 if (ret_len < 0) {
681 fprintf(stderr, "[error] Error sending cmd\n");
682 ret = ret_len;
683 goto error;
684 }
685 assert(ret_len == sizeof(cmd));
686
687 do {
688 ret_len = send(ctx->control_sock, &rq, sizeof(rq), 0);
689 } while (ret_len < 0 && errno == EINTR);
690 if (ret_len < 0) {
691 fprintf(stderr, "[error] Error sending get_next_index request\n");
692 ret = ret_len;
693 goto error;
694 }
695 assert(ret_len == sizeof(rq));
696
697 do {
698 ret_len = recv(ctx->control_sock, &rp, sizeof(rp), 0);
699 } while (ret_len < 0 && errno == EINTR);
700 if (ret_len < 0) {
701 fprintf(stderr, "[error] Error receiving index response\n");
702 ret = ret_len;
703 goto error;
704 }
705 assert(ret_len == sizeof(rp));
706
707 rp.flags = be32toh(rp.flags);
708
709 switch (be32toh(rp.status)) {
710 case LTTNG_VIEWER_INDEX_INACTIVE:
711 printf_verbose("get_next_index: inactive\n");
712 memset(index, 0, sizeof(struct packet_index));
713 index->timestamp_end = be64toh(rp.timestamp_end);
714 break;
715 case LTTNG_VIEWER_INDEX_OK:
716 printf_verbose("get_next_index: Ok, need metadata update : %u\n",
717 rp.flags & LTTNG_VIEWER_FLAG_NEW_METADATA);
718 index->offset = be64toh(rp.offset);
719 index->packet_size = be64toh(rp.packet_size);
720 index->content_size = be64toh(rp.content_size);
721 index->timestamp_begin = be64toh(rp.timestamp_begin);
722 index->timestamp_end = be64toh(rp.timestamp_end);
723 index->events_discarded = be64toh(rp.events_discarded);
724
725 if (rp.flags & LTTNG_VIEWER_FLAG_NEW_METADATA) {
726 printf_verbose("get_next_index: new metadata needed\n");
727 ret = get_new_metadata(ctx, viewer_stream,
728 &metadata_len);
729 if (ret < 0) {
730 goto error;
731 }
732 }
733 break;
734 case LTTNG_VIEWER_INDEX_RETRY:
735 printf_verbose("get_next_index: retry\n");
736 sleep(1);
737 goto retry;
738 case LTTNG_VIEWER_INDEX_HUP:
739 printf_verbose("get_next_index: stream hung up\n");
740 viewer_stream->id = -1ULL;
741 viewer_stream->fd = -1;
742 index->offset = EOF;
743 break;
744 case LTTNG_VIEWER_INDEX_ERR:
745 fprintf(stderr, "[error] get_next_index: error\n");
746 ret = -1;
747 goto error;
748 default:
749 fprintf(stderr, "[error] get_next_index: unkwown value\n");
750 ret = -1;
751 goto error;
752 }
753
754 ret = 0;
755
756error:
757 return ret;
758}
759
760void ctf_live_packet_seek(struct bt_stream_pos *stream_pos, size_t index,
761 int whence)
762{
763 struct ctf_stream_pos *pos;
764 struct ctf_file_stream *file_stream;
765 struct packet_index packet_index;
766 struct lttng_live_viewer_stream *viewer_stream;
767 struct lttng_live_session *session;
768 int ret;
769
770retry:
771 pos = ctf_pos(stream_pos);
772 file_stream = container_of(pos, struct ctf_file_stream, pos);
773 viewer_stream = (struct lttng_live_viewer_stream *) pos->priv;
774 session = viewer_stream->session;
775
776 printf_verbose("get_next_index for stream %" PRIu64 "\n", viewer_stream->id);
777 ret = get_next_index(session->ctx, viewer_stream, &packet_index);
778 if (ret < 0) {
779 pos->offset = EOF;
780 fprintf(stderr, "[error] get_next_index failed\n");
781 return;
782 }
783
784 pos->packet_size = packet_index.packet_size;
785 pos->content_size = packet_index.content_size;
786 pos->mmap_base_offset = 0;
787 if (packet_index.offset == EOF) {
788 pos->offset = EOF;
789 } else {
790 pos->offset = 0;
791 }
792
793 if (packet_index.content_size == 0) {
794 file_stream->parent.cycles_timestamp = packet_index.timestamp_end;
795 file_stream->parent.real_timestamp = ctf_get_real_timestamp(
796 &file_stream->parent, packet_index.timestamp_end);
797 } else {
798 file_stream->parent.cycles_timestamp = packet_index.timestamp_begin;
799 file_stream->parent.real_timestamp = ctf_get_real_timestamp(
800 &file_stream->parent, packet_index.timestamp_begin);
801 }
802
803 if (pos->packet_size == 0 || pos->offset == EOF) {
804 goto end;
805 }
806
807 printf_verbose("get_data_packet for stream %" PRIu64 "\n",
808 viewer_stream->id);
809 ret = get_data_packet(session->ctx, pos, viewer_stream,
810 be64toh(packet_index.offset),
811 packet_index.packet_size / CHAR_BIT);
812 if (ret == -2) {
813 goto retry;
814 } else if (ret < 0) {
815 pos->offset = EOF;
816 fprintf(stderr, "[error] get_data_packet failed\n");
817 return;
818 }
819
820 printf_verbose("Index received : packet_size : %" PRIu64
821 ", offset %" PRIu64 ", content_size %" PRIu64
822 ", timestamp_end : %" PRIu64 "\n",
823 packet_index.packet_size, packet_index.offset,
824 packet_index.content_size, packet_index.timestamp_end);
825
826 /* update trace_packet_header and stream_packet_context */
827 if (pos->prot != PROT_WRITE && file_stream->parent.trace_packet_header) {
828 /* Read packet header */
829 ret = generic_rw(&pos->parent, &file_stream->parent.trace_packet_header->p);
830 if (ret) {
831 pos->offset = EOF;
832 fprintf(stderr, "[error] trace packet header read failed\n");
833 goto end;
834 }
835 }
836 if (pos->prot != PROT_WRITE && file_stream->parent.stream_packet_context) {
837 /* Read packet context */
838 ret = generic_rw(&pos->parent, &file_stream->parent.stream_packet_context->p);
839 if (ret) {
840 pos->offset = EOF;
841 fprintf(stderr, "[error] stream packet context read failed\n");
842 goto end;
843 }
844 }
845 pos->data_offset = pos->offset;
846
847end:
848 return;
849}
850
851static int del_traces(gpointer key, gpointer value, gpointer user_data)
852{
853 struct bt_context *bt_ctx = user_data;
854 struct lttng_live_ctf_trace *trace = value;
855 int ret;
856
857 ret = bt_context_remove_trace(bt_ctx, trace->trace_id);
858 if (ret < 0)
859 fprintf(stderr, "[error] removing trace from context\n");
860
861 /* remove the key/value pair from the HT. */
862 return 1;
863}
864
865static void add_traces(gpointer key, gpointer value, gpointer user_data)
866{
867 int i, ret, total_metadata = 0;
868 uint64_t metadata_len;
869 struct bt_context *bt_ctx = user_data;
870 struct lttng_live_ctf_trace *trace = value;
871 struct lttng_live_viewer_stream *stream;
872 struct bt_mmap_stream *new_mmap_stream;
873 struct bt_mmap_stream_list mmap_list;
874 struct lttng_live_ctx *ctx = NULL;
875
876 BT_INIT_LIST_HEAD(&mmap_list.head);
877
878 for (i = 0; i < trace->streams->len; i++) {
879 stream = g_ptr_array_index(trace->streams, i);
880 ctx = stream->session->ctx;
881
882 if (!stream->metadata_flag) {
883 new_mmap_stream = zmalloc(sizeof(struct bt_mmap_stream));
884 new_mmap_stream->priv = (void *) stream;
885 new_mmap_stream->fd = -1;
886 bt_list_add(&new_mmap_stream->list, &mmap_list.head);
887 } else {
888 /* Get all possible metadata before starting */
889 do {
890 ret = get_new_metadata(ctx, stream,
891 &metadata_len);
892 if (ret == 0) {
893 total_metadata += metadata_len;
894 }
895 } while (ret == 0 || total_metadata == 0);
896 trace->metadata_fp = fopen(stream->path, "r");
897 }
898 }
899
900 if (!trace->metadata_fp) {
901 fprintf(stderr, "[error] No metadata stream opened\n");
902 goto end_free;
903 }
904
905 ret = bt_context_add_trace(bt_ctx, NULL, "ctf",
906 ctf_live_packet_seek, &mmap_list, trace->metadata_fp);
907 if (ret < 0) {
908 fprintf(stderr, "[error] Error adding trace\n");
909 goto end_free;
910 }
911 trace->trace_id = ret;
912
913 goto end;
914
915end_free:
916 bt_context_put(bt_ctx);
917end:
918 return;
919}
920
921void lttng_live_read(struct lttng_live_ctx *ctx, uint64_t session_id)
922{
923 int ret, active_session = 0;
924 struct bt_context *bt_ctx;
925 struct bt_ctf_iter *iter;
926 const struct bt_ctf_event *event;
927 struct bt_iter_pos begin_pos;
928 struct bt_trace_descriptor *td_write;
929 struct bt_format *fmt_write;
930 struct ctf_text_stream_pos *sout;
931
932 bt_ctx = bt_context_create();
933 if (!bt_ctx) {
934 fprintf(stderr, "[error] bt_context_create allocation\n");
935 goto end;
936 }
937
938 fmt_write = bt_lookup_format(g_quark_from_static_string("text"));
939 if (!fmt_write) {
940 fprintf(stderr, "[error] ctf-text error\n");
941 goto end;
942 }
943
944 td_write = fmt_write->open_trace(NULL, O_RDWR, NULL, NULL);
945 if (!td_write) {
946 fprintf(stderr, "[error] Error opening output trace\n");
947 goto end_free;
948 }
949
950 sout = container_of(td_write, struct ctf_text_stream_pos,
951 trace_descriptor);
952 if (!sout->parent.event_cb)
953 goto end_free;
954
955 /*
956 * As long as the session is active, we try to reattach to it,
957 * even if all the streams get closed.
958 */
959 do {
960 int flags;
961
962 do {
963 ret = lttng_live_attach_session(ctx, session_id);
964 printf_verbose("Attaching session returns %d\n", ret);
965 if (ret < 0) {
966 if (ret == -LTTNG_VIEWER_ATTACH_UNK) {
967 if (active_session)
968 goto end_free;
969 fprintf(stderr, "[error] Unknown "
970 "session ID\n");
971 }
972 goto end_free;
973 } else {
974 active_session = 1;
975 }
976 } while (ctx->session->stream_count == 0);
977
978 g_hash_table_foreach(ctx->session->ctf_traces, add_traces, bt_ctx);
979
980 begin_pos.type = BT_SEEK_BEGIN;
981 iter = bt_ctf_iter_create(bt_ctx, &begin_pos, NULL);
982 if (!iter) {
983 fprintf(stderr, "[error] Iterator creation error\n");
984 goto end;
985 }
986 for (;;) {
987 event = bt_ctf_iter_read_event_flags(iter, &flags);
988 if (!(flags & BT_ITER_FLAG_RETRY)) {
989 if (!event) {
990 /* End of trace */
991 break;
992 }
993 ret = sout->parent.event_cb(&sout->parent,
994 event->parent->stream);
995 if (ret) {
996 fprintf(stderr, "[error] Writing "
997 "event failed.\n");
998 goto end_free;
999 }
1000 }
1001 ret = bt_iter_next(bt_ctf_get_iter(iter));
1002 if (ret < 0) {
1003 goto end_free;
1004 }
1005 }
1006 bt_ctf_iter_destroy(iter);
1007 g_hash_table_foreach_remove(ctx->session->ctf_traces, del_traces, bt_ctx);
1008 } while (active_session);
1009
1010end_free:
1011 bt_context_put(bt_ctx);
1012end:
1013 return;
1014}
BabelTrace - Trace Format Babel Tower
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