| 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 | |
| 65 | int 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 | |
| 98 | end: |
| 99 | return ret; |
| 100 | } |
| 101 | |
| 102 | int 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 | |
| 154 | error: |
| 155 | return ret; |
| 156 | } |
| 157 | |
| 158 | int 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 | |
| 216 | error: |
| 217 | return ret; |
| 218 | } |
| 219 | |
| 220 | int 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 | |
| 247 | error: |
| 248 | return ret; |
| 249 | } |
| 250 | |
| 251 | int 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 | |
| 396 | end: |
| 397 | error: |
| 398 | return ret; |
| 399 | } |
| 400 | |
| 401 | static |
| 402 | int 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 | |
| 532 | end: |
| 533 | error: |
| 534 | return ret; |
| 535 | } |
| 536 | |
| 537 | /* |
| 538 | * Return number of metadata bytes written or a negative value on error. |
| 539 | */ |
| 540 | static |
| 541 | int 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; |
| 647 | end: |
| 648 | error: |
| 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 | */ |
| 657 | static |
| 658 | int 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 | |
| 676 | retry: |
| 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 | |
| 756 | error: |
| 757 | return ret; |
| 758 | } |
| 759 | |
| 760 | void 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 | |
| 770 | retry: |
| 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 | |
| 847 | end: |
| 848 | return; |
| 849 | } |
| 850 | |
| 851 | static 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 | |
| 865 | static 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 | |
| 915 | end_free: |
| 916 | bt_context_put(bt_ctx); |
| 917 | end: |
| 918 | return; |
| 919 | } |
| 920 | |
| 921 | void 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 | |
| 1010 | end_free: |
| 1011 | bt_context_put(bt_ctx); |
| 1012 | end: |
| 1013 | return; |
| 1014 | } |