| 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 | printf_verbose("Create trace ctf_trace_id %" PRIu64 "\n", ctf_trace_id); |
| 394 | BT_INIT_LIST_HEAD(&trace->stream_list); |
| 395 | g_hash_table_insert(stream->session->ctf_traces, |
| 396 | &trace->ctf_trace_id, |
| 397 | trace); |
| 398 | } |
| 399 | if (stream->metadata_flag) |
| 400 | trace->metadata_stream = stream; |
| 401 | |
| 402 | assert(!stream->in_trace); |
| 403 | stream->in_trace = 1; |
| 404 | stream->ctf_trace = trace; |
| 405 | bt_list_add(&stream->trace_stream_node, &trace->stream_list); |
| 406 | |
| 407 | return ret; |
| 408 | } |
| 409 | |
| 410 | static |
| 411 | int open_metadata_fp_write(struct lttng_live_viewer_stream *stream, |
| 412 | char **metadata_buf, size_t *size) |
| 413 | { |
| 414 | int ret = 0; |
| 415 | |
| 416 | stream->metadata_fp_write = |
| 417 | babeltrace_open_memstream(metadata_buf, size); |
| 418 | if (!stream->metadata_fp_write) { |
| 419 | perror("Metadata open_memstream"); |
| 420 | ret = -1; |
| 421 | } |
| 422 | |
| 423 | return ret; |
| 424 | } |
| 425 | |
| 426 | int lttng_live_attach_session(struct lttng_live_ctx *ctx, uint64_t id) |
| 427 | { |
| 428 | struct lttng_viewer_cmd cmd; |
| 429 | struct lttng_viewer_attach_session_request rq; |
| 430 | struct lttng_viewer_attach_session_response rp; |
| 431 | struct lttng_viewer_stream stream; |
| 432 | const size_t cmd_buf_len = sizeof(cmd) + sizeof(rq); |
| 433 | char cmd_buf[cmd_buf_len]; |
| 434 | int ret, i; |
| 435 | ssize_t ret_len; |
| 436 | |
| 437 | if (lttng_live_should_quit()) { |
| 438 | ret = -1; |
| 439 | goto end; |
| 440 | } |
| 441 | |
| 442 | cmd.cmd = htobe32(LTTNG_VIEWER_ATTACH_SESSION); |
| 443 | cmd.data_size = htobe64((uint64_t) sizeof(rq)); |
| 444 | cmd.cmd_version = htobe32(0); |
| 445 | |
| 446 | memset(&rq, 0, sizeof(rq)); |
| 447 | rq.session_id = htobe64(id); |
| 448 | // TODO: add cmd line parameter to select seek beginning |
| 449 | // rq.seek = htobe32(LTTNG_VIEWER_SEEK_BEGINNING); |
| 450 | rq.seek = htobe32(LTTNG_VIEWER_SEEK_LAST); |
| 451 | |
| 452 | /* |
| 453 | * Merge the cmd and connection request to prevent a write-write |
| 454 | * sequence on the TCP socket. Otherwise, a delayed ACK will prevent the |
| 455 | * second write to be performed quickly in presence of Nagle's algorithm. |
| 456 | */ |
| 457 | memcpy(cmd_buf, &cmd, sizeof(cmd)); |
| 458 | memcpy(cmd_buf + sizeof(cmd), &rq, sizeof(rq)); |
| 459 | |
| 460 | ret_len = lttng_live_send(ctx->control_sock, cmd_buf, cmd_buf_len); |
| 461 | if (ret_len < 0) { |
| 462 | perror("[error] Error sending attach command and request"); |
| 463 | goto error; |
| 464 | } |
| 465 | assert(ret_len == cmd_buf_len); |
| 466 | |
| 467 | ret_len = lttng_live_recv(ctx->control_sock, &rp, sizeof(rp)); |
| 468 | if (ret_len == 0) { |
| 469 | fprintf(stderr, "[error] Remote side has closed connection\n"); |
| 470 | goto error; |
| 471 | } |
| 472 | if (ret_len < 0) { |
| 473 | perror("[error] Error receiving attach response"); |
| 474 | goto error; |
| 475 | } |
| 476 | assert(ret_len == sizeof(rp)); |
| 477 | |
| 478 | switch(be32toh(rp.status)) { |
| 479 | case LTTNG_VIEWER_ATTACH_OK: |
| 480 | break; |
| 481 | case LTTNG_VIEWER_ATTACH_UNK: |
| 482 | ret = -LTTNG_VIEWER_ATTACH_UNK; |
| 483 | goto end; |
| 484 | case LTTNG_VIEWER_ATTACH_ALREADY: |
| 485 | fprintf(stderr, "[error] There is already a viewer attached to this session\n"); |
| 486 | goto error; |
| 487 | case LTTNG_VIEWER_ATTACH_NOT_LIVE: |
| 488 | fprintf(stderr, "[error] Not a live session\n"); |
| 489 | goto error; |
| 490 | case LTTNG_VIEWER_ATTACH_SEEK_ERR: |
| 491 | fprintf(stderr, "[error] Wrong seek parameter\n"); |
| 492 | goto error; |
| 493 | default: |
| 494 | fprintf(stderr, "[error] Unknown attach return code %u\n", |
| 495 | be32toh(rp.status)); |
| 496 | goto error; |
| 497 | } |
| 498 | if (be32toh(rp.status) != LTTNG_VIEWER_ATTACH_OK) { |
| 499 | goto error; |
| 500 | } |
| 501 | |
| 502 | ctx->session->stream_count += be32toh(rp.streams_count); |
| 503 | /* |
| 504 | * When the session is created but not started, we do an active wait |
| 505 | * until it starts. It allows the viewer to start processing the trace |
| 506 | * as soon as the session starts. |
| 507 | */ |
| 508 | if (ctx->session->stream_count == 0) { |
| 509 | ret = 0; |
| 510 | goto end; |
| 511 | } |
| 512 | printf_verbose("Waiting for %d streams:\n", |
| 513 | be32toh(rp.streams_count)); |
| 514 | for (i = 0; i < be32toh(rp.streams_count); i++) { |
| 515 | struct lttng_live_viewer_stream *lvstream; |
| 516 | |
| 517 | lvstream = g_new0(struct lttng_live_viewer_stream, 1); |
| 518 | ret_len = lttng_live_recv(ctx->control_sock, &stream, |
| 519 | sizeof(stream)); |
| 520 | if (ret_len == 0) { |
| 521 | fprintf(stderr, "[error] Remote side has closed connection\n"); |
| 522 | g_free(lvstream); |
| 523 | goto error; |
| 524 | } |
| 525 | if (ret_len < 0) { |
| 526 | perror("[error] Error receiving stream"); |
| 527 | g_free(lvstream); |
| 528 | goto error; |
| 529 | } |
| 530 | assert(ret_len == sizeof(stream)); |
| 531 | stream.path_name[LTTNG_VIEWER_PATH_MAX - 1] = '\0'; |
| 532 | stream.channel_name[LTTNG_VIEWER_NAME_MAX - 1] = '\0'; |
| 533 | |
| 534 | printf_verbose(" stream %" PRIu64 " : %s/%s\n", |
| 535 | be64toh(stream.id), stream.path_name, |
| 536 | stream.channel_name); |
| 537 | lvstream->id = be64toh(stream.id); |
| 538 | lvstream->session = ctx->session; |
| 539 | |
| 540 | lvstream->mmap_size = 0; |
| 541 | lvstream->ctf_stream_id = -1ULL; |
| 542 | |
| 543 | if (be32toh(stream.metadata_flag)) { |
| 544 | lvstream->metadata_flag = 1; |
| 545 | } |
| 546 | ret = lttng_live_ctf_trace_assign(lvstream, |
| 547 | be64toh(stream.ctf_trace_id)); |
| 548 | if (ret < 0) { |
| 549 | g_free(lvstream); |
| 550 | goto error; |
| 551 | } |
| 552 | bt_list_add(&lvstream->session_stream_node, |
| 553 | &ctx->session->stream_list); |
| 554 | } |
| 555 | ret = 0; |
| 556 | end: |
| 557 | return ret; |
| 558 | |
| 559 | error: |
| 560 | return -1; |
| 561 | } |
| 562 | |
| 563 | /* |
| 564 | * Ask the relay for new streams. |
| 565 | * |
| 566 | * Returns the number of new streams received or a negative value on error. |
| 567 | */ |
| 568 | static |
| 569 | int ask_new_streams(struct lttng_live_ctx *ctx) |
| 570 | { |
| 571 | int i, ret = 0, nb_streams = 0; |
| 572 | uint64_t id; |
| 573 | |
| 574 | restart: |
| 575 | for (i = 0; i < ctx->session_ids->len; i++) { |
| 576 | id = g_array_index(ctx->session_ids, uint64_t, i); |
| 577 | ret = lttng_live_get_new_streams(ctx, id); |
| 578 | printf_verbose("Asking for new streams returns %d\n", ret); |
| 579 | if (lttng_live_should_quit()) { |
| 580 | ret = -1; |
| 581 | goto end; |
| 582 | } |
| 583 | if (ret < 0) { |
| 584 | if (ret == -LTTNG_VIEWER_NEW_STREAMS_HUP) { |
| 585 | printf_verbose("Session %" PRIu64 " closed\n", |
| 586 | id); |
| 587 | /* |
| 588 | * The streams have already been closed during |
| 589 | * the reading, so we only need to get rid of |
| 590 | * the trace in our internal table of sessions. |
| 591 | */ |
| 592 | g_array_remove_index(ctx->session_ids, i); |
| 593 | /* |
| 594 | * We can't continue iterating on the g_array |
| 595 | * after a remove, we have to start again. |
| 596 | */ |
| 597 | goto restart; |
| 598 | } else { |
| 599 | ret = -1; |
| 600 | goto end; |
| 601 | } |
| 602 | } else { |
| 603 | nb_streams += ret; |
| 604 | } |
| 605 | } |
| 606 | if (ctx->session_ids->len == 0) { |
| 607 | /* All sessions are closed. */ |
| 608 | ret = -1; |
| 609 | } else { |
| 610 | ret = nb_streams; |
| 611 | } |
| 612 | |
| 613 | end: |
| 614 | return ret; |
| 615 | } |
| 616 | |
| 617 | static |
| 618 | int append_metadata(struct lttng_live_ctx *ctx, |
| 619 | struct lttng_live_viewer_stream *viewer_stream) |
| 620 | { |
| 621 | int ret; |
| 622 | struct lttng_live_viewer_stream *metadata; |
| 623 | char *metadata_buf = NULL; |
| 624 | |
| 625 | if (!viewer_stream->ctf_trace->handle) { |
| 626 | printf_verbose("append_metadata: trace handle not ready yet.\n"); |
| 627 | return 0; |
| 628 | } |
| 629 | |
| 630 | printf_verbose("get_next_index: new metadata needed\n"); |
| 631 | ret = get_new_metadata(ctx, viewer_stream, &metadata_buf); |
| 632 | if (ret < 0) { |
| 633 | free(metadata_buf); |
| 634 | goto error; |
| 635 | } |
| 636 | |
| 637 | metadata = viewer_stream->ctf_trace->metadata_stream; |
| 638 | metadata->ctf_trace->metadata_fp = |
| 639 | babeltrace_fmemopen(metadata_buf, |
| 640 | metadata->metadata_len, "rb"); |
| 641 | if (!metadata->ctf_trace->metadata_fp) { |
| 642 | perror("Metadata fmemopen"); |
| 643 | free(metadata_buf); |
| 644 | ret = -1; |
| 645 | goto error; |
| 646 | } |
| 647 | ret = ctf_append_trace_metadata( |
| 648 | viewer_stream->ctf_trace->handle->td, |
| 649 | metadata->ctf_trace->metadata_fp); |
| 650 | /* We accept empty metadata packets */ |
| 651 | if (ret != 0 && ret != -ENOENT) { |
| 652 | fprintf(stderr, "[error] Appending metadata\n"); |
| 653 | goto error; |
| 654 | } |
| 655 | ret = 0; |
| 656 | |
| 657 | error: |
| 658 | return ret; |
| 659 | } |
| 660 | |
| 661 | static |
| 662 | int get_data_packet(struct lttng_live_ctx *ctx, |
| 663 | struct ctf_stream_pos *pos, |
| 664 | struct lttng_live_viewer_stream *stream, uint64_t offset, |
| 665 | uint64_t len) |
| 666 | { |
| 667 | struct lttng_viewer_cmd cmd; |
| 668 | struct lttng_viewer_get_packet rq; |
| 669 | struct lttng_viewer_trace_packet rp; |
| 670 | const size_t cmd_buf_len = sizeof(cmd) + sizeof(rq); |
| 671 | char cmd_buf[cmd_buf_len]; |
| 672 | ssize_t ret_len; |
| 673 | int ret; |
| 674 | |
| 675 | retry: |
| 676 | if (lttng_live_should_quit()) { |
| 677 | ret = -1; |
| 678 | goto end; |
| 679 | } |
| 680 | |
| 681 | cmd.cmd = htobe32(LTTNG_VIEWER_GET_PACKET); |
| 682 | cmd.data_size = htobe64((uint64_t) sizeof(rq)); |
| 683 | cmd.cmd_version = htobe32(0); |
| 684 | |
| 685 | memset(&rq, 0, sizeof(rq)); |
| 686 | rq.stream_id = htobe64(stream->id); |
| 687 | rq.offset = htobe64(offset); |
| 688 | rq.len = htobe32(len); |
| 689 | |
| 690 | /* |
| 691 | * Merge the cmd and connection request to prevent a write-write |
| 692 | * sequence on the TCP socket. Otherwise, a delayed ACK will prevent the |
| 693 | * second write to be performed quickly in presence of Nagle's algorithm. |
| 694 | */ |
| 695 | memcpy(cmd_buf, &cmd, sizeof(cmd)); |
| 696 | memcpy(cmd_buf + sizeof(cmd), &rq, sizeof(rq)); |
| 697 | |
| 698 | ret_len = lttng_live_send(ctx->control_sock, cmd_buf, cmd_buf_len); |
| 699 | if (ret_len < 0) { |
| 700 | perror("[error] Error sending get_data_packet cmd and request"); |
| 701 | goto error; |
| 702 | } |
| 703 | assert(ret_len == cmd_buf_len); |
| 704 | |
| 705 | ret_len = lttng_live_recv(ctx->control_sock, &rp, sizeof(rp)); |
| 706 | if (ret_len == 0) { |
| 707 | fprintf(stderr, "[error] Remote side has closed connection\n"); |
| 708 | goto error; |
| 709 | } |
| 710 | if (ret_len < 0) { |
| 711 | perror("[error] Error receiving data response"); |
| 712 | goto error; |
| 713 | } |
| 714 | if (ret_len != sizeof(rp)) { |
| 715 | fprintf(stderr, "[error] get_data_packet: expected %zu" |
| 716 | ", received %zd\n", sizeof(rp), |
| 717 | ret_len); |
| 718 | goto error; |
| 719 | } |
| 720 | |
| 721 | rp.flags = be32toh(rp.flags); |
| 722 | |
| 723 | switch (be32toh(rp.status)) { |
| 724 | case LTTNG_VIEWER_GET_PACKET_OK: |
| 725 | len = be32toh(rp.len); |
| 726 | printf_verbose("get_data_packet: Ok, packet size : %" PRIu64 |
| 727 | "\n", len); |
| 728 | break; |
| 729 | case LTTNG_VIEWER_GET_PACKET_RETRY: |
| 730 | /* Unimplemented by relay daemon */ |
| 731 | printf_verbose("get_data_packet: retry\n"); |
| 732 | goto error; |
| 733 | case LTTNG_VIEWER_GET_PACKET_ERR: |
| 734 | if (rp.flags & LTTNG_VIEWER_FLAG_NEW_METADATA) { |
| 735 | printf_verbose("get_data_packet: new metadata needed\n"); |
| 736 | ret = append_metadata(ctx, stream); |
| 737 | if (ret) |
| 738 | goto error; |
| 739 | } |
| 740 | if (rp.flags & LTTNG_VIEWER_FLAG_NEW_STREAM) { |
| 741 | printf_verbose("get_data_packet: new streams needed\n"); |
| 742 | ret = ask_new_streams(ctx); |
| 743 | if (ret < 0) { |
| 744 | goto error; |
| 745 | } else if (ret > 0) { |
| 746 | ret = add_traces(ctx); |
| 747 | if (ret < 0) { |
| 748 | goto error; |
| 749 | } |
| 750 | } |
| 751 | } |
| 752 | if (rp.flags & (LTTNG_VIEWER_FLAG_NEW_METADATA |
| 753 | | LTTNG_VIEWER_FLAG_NEW_STREAM)) { |
| 754 | goto retry; |
| 755 | } |
| 756 | fprintf(stderr, "[error] get_data_packet: error\n"); |
| 757 | goto error; |
| 758 | case LTTNG_VIEWER_GET_PACKET_EOF: |
| 759 | ret = -2; |
| 760 | goto end; |
| 761 | default: |
| 762 | printf_verbose("get_data_packet: unknown\n"); |
| 763 | goto error; |
| 764 | } |
| 765 | |
| 766 | if (len == 0) { |
| 767 | goto error; |
| 768 | } |
| 769 | |
| 770 | if (len > stream->mmap_size) { |
| 771 | uint64_t new_size; |
| 772 | |
| 773 | new_size = max_t(uint64_t, len, stream->mmap_size << 1); |
| 774 | if (pos->base_mma) { |
| 775 | /* unmap old base */ |
| 776 | ret = munmap_align(pos->base_mma); |
| 777 | if (ret) { |
| 778 | perror("[error] Unable to unmap old base"); |
| 779 | goto error; |
| 780 | } |
| 781 | pos->base_mma = NULL; |
| 782 | } |
| 783 | pos->base_mma = mmap_align(new_size, |
| 784 | PROT_READ | PROT_WRITE, |
| 785 | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); |
| 786 | if (pos->base_mma == MAP_FAILED) { |
| 787 | perror("[error] mmap error"); |
| 788 | pos->base_mma = NULL; |
| 789 | goto error; |
| 790 | } |
| 791 | |
| 792 | stream->mmap_size = new_size; |
| 793 | printf_verbose("Expanding stream mmap size to %" PRIu64 " bytes\n", |
| 794 | stream->mmap_size); |
| 795 | } |
| 796 | |
| 797 | ret_len = lttng_live_recv(ctx->control_sock, |
| 798 | mmap_align_addr(pos->base_mma), len); |
| 799 | if (ret_len == 0) { |
| 800 | fprintf(stderr, "[error] Remote side has closed connection\n"); |
| 801 | goto error; |
| 802 | } |
| 803 | if (ret_len < 0) { |
| 804 | perror("[error] Error receiving trace packet"); |
| 805 | goto error; |
| 806 | } |
| 807 | assert(ret_len == len); |
| 808 | ret = 0; |
| 809 | end: |
| 810 | return ret; |
| 811 | |
| 812 | error: |
| 813 | return -1; |
| 814 | } |
| 815 | |
| 816 | static |
| 817 | int get_one_metadata_packet(struct lttng_live_ctx *ctx, |
| 818 | struct lttng_live_viewer_stream *metadata_stream) |
| 819 | { |
| 820 | uint64_t len = 0; |
| 821 | int ret; |
| 822 | struct lttng_viewer_cmd cmd; |
| 823 | struct lttng_viewer_get_metadata rq; |
| 824 | struct lttng_viewer_metadata_packet rp; |
| 825 | char *data = NULL; |
| 826 | ssize_t ret_len; |
| 827 | const size_t cmd_buf_len = sizeof(cmd) + sizeof(rq); |
| 828 | char cmd_buf[cmd_buf_len]; |
| 829 | |
| 830 | if (lttng_live_should_quit()) { |
| 831 | ret = -1; |
| 832 | goto end; |
| 833 | } |
| 834 | |
| 835 | rq.stream_id = htobe64(metadata_stream->id); |
| 836 | cmd.cmd = htobe32(LTTNG_VIEWER_GET_METADATA); |
| 837 | cmd.data_size = htobe64((uint64_t) sizeof(rq)); |
| 838 | cmd.cmd_version = htobe32(0); |
| 839 | |
| 840 | /* |
| 841 | * Merge the cmd and connection request to prevent a write-write |
| 842 | * sequence on the TCP socket. Otherwise, a delayed ACK will prevent the |
| 843 | * second write to be performed quickly in presence of Nagle's algorithm. |
| 844 | */ |
| 845 | memcpy(cmd_buf, &cmd, sizeof(cmd)); |
| 846 | memcpy(cmd_buf + sizeof(cmd), &rq, sizeof(rq)); |
| 847 | |
| 848 | printf_verbose("get_metadata for trace_id: %d, ctf_trace_id: %" PRIu64 "\n", |
| 849 | metadata_stream->ctf_trace->trace_id, |
| 850 | metadata_stream->ctf_trace->ctf_trace_id); |
| 851 | ret_len = lttng_live_send(ctx->control_sock, cmd_buf, cmd_buf_len); |
| 852 | if (ret_len < 0) { |
| 853 | perror("[error] Error sending get_metadata cmd and request"); |
| 854 | goto error; |
| 855 | } |
| 856 | assert(ret_len == cmd_buf_len); |
| 857 | |
| 858 | ret_len = lttng_live_recv(ctx->control_sock, &rp, sizeof(rp)); |
| 859 | if (ret_len == 0) { |
| 860 | fprintf(stderr, "[error] Remote side has closed connection\n"); |
| 861 | goto error; |
| 862 | } |
| 863 | if (ret_len < 0) { |
| 864 | perror("[error] Error receiving metadata response"); |
| 865 | goto error; |
| 866 | } |
| 867 | assert(ret_len == sizeof(rp)); |
| 868 | |
| 869 | switch (be32toh(rp.status)) { |
| 870 | case LTTNG_VIEWER_METADATA_OK: |
| 871 | printf_verbose("get_metadata : OK\n"); |
| 872 | break; |
| 873 | case LTTNG_VIEWER_NO_NEW_METADATA: |
| 874 | printf_verbose("get_metadata : NO NEW\n"); |
| 875 | ret = 0; |
| 876 | goto end; |
| 877 | case LTTNG_VIEWER_METADATA_ERR: |
| 878 | printf_verbose("get_metadata : ERR\n"); |
| 879 | goto error; |
| 880 | default: |
| 881 | printf_verbose("get_metadata : UNKNOWN\n"); |
| 882 | goto error; |
| 883 | } |
| 884 | |
| 885 | len = be64toh(rp.len); |
| 886 | printf_verbose("Writing %" PRIu64" bytes to metadata\n", len); |
| 887 | if (len <= 0) { |
| 888 | goto error; |
| 889 | } |
| 890 | |
| 891 | data = zmalloc(len); |
| 892 | if (!data) { |
| 893 | perror("relay data zmalloc"); |
| 894 | goto error; |
| 895 | } |
| 896 | ret_len = lttng_live_recv(ctx->control_sock, data, len); |
| 897 | if (ret_len == 0) { |
| 898 | fprintf(stderr, "[error] Remote side has closed connection\n"); |
| 899 | goto error_free_data; |
| 900 | } |
| 901 | if (ret_len < 0) { |
| 902 | perror("[error] Error receiving trace packet"); |
| 903 | goto error_free_data; |
| 904 | } |
| 905 | assert(ret_len == len); |
| 906 | |
| 907 | do { |
| 908 | ret_len = fwrite(data, 1, len, |
| 909 | metadata_stream->metadata_fp_write); |
| 910 | } while (ret_len < 0 && errno == EINTR); |
| 911 | if (ret_len < 0) { |
| 912 | fprintf(stderr, "[error] Writing in the metadata fp\n"); |
| 913 | goto error_free_data; |
| 914 | } |
| 915 | assert(ret_len == len); |
| 916 | metadata_stream->metadata_len += len; |
| 917 | free(data); |
| 918 | ret = len; |
| 919 | end: |
| 920 | return ret; |
| 921 | |
| 922 | error_free_data: |
| 923 | free(data); |
| 924 | error: |
| 925 | return -1; |
| 926 | } |
| 927 | |
| 928 | /* |
| 929 | * Return 0 on success, a negative value on error. |
| 930 | */ |
| 931 | static |
| 932 | int get_new_metadata(struct lttng_live_ctx *ctx, |
| 933 | struct lttng_live_viewer_stream *viewer_stream, |
| 934 | char **metadata_buf) |
| 935 | { |
| 936 | int ret = 0; |
| 937 | struct lttng_live_viewer_stream *metadata_stream; |
| 938 | size_t size, len_read = 0; |
| 939 | |
| 940 | metadata_stream = viewer_stream->ctf_trace->metadata_stream; |
| 941 | if (!metadata_stream) { |
| 942 | fprintf(stderr, "[error] No metadata stream\n"); |
| 943 | ret = -1; |
| 944 | goto error; |
| 945 | } |
| 946 | metadata_stream->metadata_len = 0; |
| 947 | ret = open_metadata_fp_write(metadata_stream, metadata_buf, &size); |
| 948 | if (ret < 0) { |
| 949 | goto error; |
| 950 | } |
| 951 | |
| 952 | do { |
| 953 | if (lttng_live_should_quit()) { |
| 954 | ret = -1; |
| 955 | goto error; |
| 956 | } |
| 957 | /* |
| 958 | * get_one_metadata_packet returns the number of bytes |
| 959 | * received, 0 when we have received everything, a |
| 960 | * negative value on error. |
| 961 | */ |
| 962 | ret = get_one_metadata_packet(ctx, metadata_stream); |
| 963 | if (ret > 0) { |
| 964 | len_read += ret; |
| 965 | } |
| 966 | if (!len_read) { |
| 967 | (void) poll(NULL, 0, ACTIVE_POLL_DELAY); |
| 968 | } |
| 969 | if (ret < 0) { |
| 970 | break; /* Stop on error. */ |
| 971 | } |
| 972 | } while (ret > 0 || !len_read); |
| 973 | |
| 974 | if (babeltrace_close_memstream(metadata_buf, &size, |
| 975 | metadata_stream->metadata_fp_write)) { |
| 976 | perror("babeltrace_close_memstream"); |
| 977 | } |
| 978 | metadata_stream->metadata_fp_write = NULL; |
| 979 | |
| 980 | error: |
| 981 | return ret; |
| 982 | } |
| 983 | |
| 984 | /* |
| 985 | * Assign the fields from a lttng_viewer_index to a packet_index. |
| 986 | */ |
| 987 | static |
| 988 | void lttng_index_to_packet_index(struct lttng_viewer_index *lindex, |
| 989 | struct packet_index *pindex) |
| 990 | { |
| 991 | assert(lindex); |
| 992 | assert(pindex); |
| 993 | |
| 994 | pindex->offset = be64toh(lindex->offset); |
| 995 | pindex->packet_size = be64toh(lindex->packet_size); |
| 996 | pindex->content_size = be64toh(lindex->content_size); |
| 997 | pindex->ts_cycles.timestamp_begin = be64toh(lindex->timestamp_begin); |
| 998 | pindex->ts_cycles.timestamp_end = be64toh(lindex->timestamp_end); |
| 999 | pindex->events_discarded = be64toh(lindex->events_discarded); |
| 1000 | } |
| 1001 | |
| 1002 | /* |
| 1003 | * Get one index for a stream. |
| 1004 | * |
| 1005 | * Returns 0 on success or a negative value on error. |
| 1006 | */ |
| 1007 | static |
| 1008 | int get_next_index(struct lttng_live_ctx *ctx, |
| 1009 | struct lttng_live_viewer_stream *viewer_stream, |
| 1010 | struct packet_index *index, uint64_t *stream_id) |
| 1011 | { |
| 1012 | struct lttng_viewer_cmd cmd; |
| 1013 | struct lttng_viewer_get_next_index rq; |
| 1014 | int ret; |
| 1015 | ssize_t ret_len; |
| 1016 | struct lttng_viewer_index *rp = &viewer_stream->current_index; |
| 1017 | const size_t cmd_buf_len = sizeof(cmd) + sizeof(rq); |
| 1018 | char cmd_buf[cmd_buf_len]; |
| 1019 | |
| 1020 | cmd.cmd = htobe32(LTTNG_VIEWER_GET_NEXT_INDEX); |
| 1021 | cmd.data_size = htobe64((uint64_t) sizeof(rq)); |
| 1022 | cmd.cmd_version = htobe32(0); |
| 1023 | |
| 1024 | memset(&rq, 0, sizeof(rq)); |
| 1025 | rq.stream_id = htobe64(viewer_stream->id); |
| 1026 | |
| 1027 | /* |
| 1028 | * Merge the cmd and connection request to prevent a write-write |
| 1029 | * sequence on the TCP socket. Otherwise, a delayed ACK will prevent the |
| 1030 | * second write to be performed quickly in presence of Nagle's algorithm. |
| 1031 | */ |
| 1032 | memcpy(cmd_buf, &cmd, sizeof(cmd)); |
| 1033 | memcpy(cmd_buf + sizeof(cmd), &rq, sizeof(rq)); |
| 1034 | retry: |
| 1035 | if (lttng_live_should_quit()) { |
| 1036 | ret = -1; |
| 1037 | goto end; |
| 1038 | } |
| 1039 | ret_len = lttng_live_send(ctx->control_sock, &cmd_buf, cmd_buf_len); |
| 1040 | if (ret_len < 0) { |
| 1041 | perror("[error] Error sending get_next_index cmd and request"); |
| 1042 | goto error; |
| 1043 | } |
| 1044 | assert(ret_len == cmd_buf_len); |
| 1045 | |
| 1046 | ret_len = lttng_live_recv(ctx->control_sock, rp, sizeof(*rp)); |
| 1047 | if (ret_len == 0) { |
| 1048 | fprintf(stderr, "[error] Remote side has closed connection\n"); |
| 1049 | goto error; |
| 1050 | } |
| 1051 | if (ret_len < 0) { |
| 1052 | perror("[error] Error receiving index response"); |
| 1053 | goto error; |
| 1054 | } |
| 1055 | assert(ret_len == sizeof(*rp)); |
| 1056 | |
| 1057 | rp->flags = be32toh(rp->flags); |
| 1058 | |
| 1059 | switch (be32toh(rp->status)) { |
| 1060 | case LTTNG_VIEWER_INDEX_INACTIVE: |
| 1061 | printf_verbose("get_next_index: inactive\n"); |
| 1062 | |
| 1063 | if (index->ts_cycles.timestamp_end == |
| 1064 | be64toh(rp->timestamp_end)) { |
| 1065 | /* Already seen this timestamp. */ |
| 1066 | (void) poll(NULL, 0, ACTIVE_POLL_DELAY); |
| 1067 | } |
| 1068 | |
| 1069 | memset(index, 0, sizeof(struct packet_index)); |
| 1070 | index->ts_cycles.timestamp_end = be64toh(rp->timestamp_end); |
| 1071 | *stream_id = be64toh(rp->stream_id); |
| 1072 | break; |
| 1073 | case LTTNG_VIEWER_INDEX_OK: |
| 1074 | printf_verbose("get_next_index: Ok, need metadata update : %u\n", |
| 1075 | rp->flags & LTTNG_VIEWER_FLAG_NEW_METADATA); |
| 1076 | lttng_index_to_packet_index(rp, index); |
| 1077 | *stream_id = be64toh(rp->stream_id); |
| 1078 | viewer_stream->data_pending = 1; |
| 1079 | |
| 1080 | if (rp->flags & LTTNG_VIEWER_FLAG_NEW_METADATA) { |
| 1081 | ret = append_metadata(ctx, viewer_stream); |
| 1082 | if (ret) |
| 1083 | goto error; |
| 1084 | } |
| 1085 | if (rp->flags & LTTNG_VIEWER_FLAG_NEW_STREAM) { |
| 1086 | printf_verbose("get_next_index: need new streams\n"); |
| 1087 | ret = ask_new_streams(ctx); |
| 1088 | if (ret < 0) { |
| 1089 | goto error; |
| 1090 | } else if (ret > 0) { |
| 1091 | ret = add_traces(ctx); |
| 1092 | if (ret < 0) { |
| 1093 | goto error; |
| 1094 | } |
| 1095 | } |
| 1096 | } |
| 1097 | break; |
| 1098 | case LTTNG_VIEWER_INDEX_RETRY: |
| 1099 | printf_verbose("get_next_index: retry\n"); |
| 1100 | (void) poll(NULL, 0, ACTIVE_POLL_DELAY); |
| 1101 | goto retry; |
| 1102 | case LTTNG_VIEWER_INDEX_HUP: |
| 1103 | printf_verbose("get_next_index: stream hung up\n"); |
| 1104 | viewer_stream->id = -1ULL; |
| 1105 | index->offset = EOF; |
| 1106 | ctx->session->stream_count--; |
| 1107 | viewer_stream->in_trace = 0; |
| 1108 | bt_list_del(&viewer_stream->trace_stream_node); |
| 1109 | bt_list_del(&viewer_stream->session_stream_node); |
| 1110 | g_free(viewer_stream); |
| 1111 | *stream_id = be64toh(rp->stream_id); |
| 1112 | break; |
| 1113 | case LTTNG_VIEWER_INDEX_ERR: |
| 1114 | fprintf(stderr, "[error] get_next_index: error\n"); |
| 1115 | goto error; |
| 1116 | default: |
| 1117 | fprintf(stderr, "[error] get_next_index: unkwown value\n"); |
| 1118 | goto error; |
| 1119 | } |
| 1120 | ret = 0; |
| 1121 | end: |
| 1122 | return ret; |
| 1123 | |
| 1124 | error: |
| 1125 | return -1; |
| 1126 | } |
| 1127 | |
| 1128 | static |
| 1129 | void read_packet_header(struct ctf_stream_pos *pos, |
| 1130 | struct ctf_file_stream *file_stream) |
| 1131 | { |
| 1132 | int ret; |
| 1133 | |
| 1134 | /* update trace_packet_header and stream_packet_context */ |
| 1135 | if (!(pos->prot & PROT_WRITE) && |
| 1136 | file_stream->parent.trace_packet_header) { |
| 1137 | /* Read packet header */ |
| 1138 | ret = generic_rw(&pos->parent, |
| 1139 | &file_stream->parent.trace_packet_header->p); |
| 1140 | if (ret) { |
| 1141 | pos->offset = EOF; |
| 1142 | fprintf(stderr, "[error] trace packet " |
| 1143 | "header read failed\n"); |
| 1144 | goto end; |
| 1145 | } |
| 1146 | } |
| 1147 | if (!(pos->prot & PROT_WRITE) && |
| 1148 | file_stream->parent.stream_packet_context) { |
| 1149 | /* Read packet context */ |
| 1150 | ret = generic_rw(&pos->parent, |
| 1151 | &file_stream->parent.stream_packet_context->p); |
| 1152 | if (ret) { |
| 1153 | pos->offset = EOF; |
| 1154 | fprintf(stderr, "[error] stream packet " |
| 1155 | "context read failed\n"); |
| 1156 | goto end; |
| 1157 | } |
| 1158 | } |
| 1159 | pos->data_offset = pos->offset; |
| 1160 | |
| 1161 | end: |
| 1162 | return; |
| 1163 | } |
| 1164 | |
| 1165 | /* |
| 1166 | * Handle the seek parameters. |
| 1167 | * Returns 0 if the packet_seek can continue, a positive value to |
| 1168 | * cleanly exit the packet_seek, a negative value on error. |
| 1169 | */ |
| 1170 | static |
| 1171 | int handle_seek_position(size_t index, int whence, |
| 1172 | struct lttng_live_viewer_stream *viewer_stream, |
| 1173 | struct ctf_stream_pos *pos, |
| 1174 | struct ctf_file_stream *file_stream) |
| 1175 | { |
| 1176 | int ret = 0; |
| 1177 | |
| 1178 | switch (whence) { |
| 1179 | case SEEK_CUR: |
| 1180 | ret = 0; |
| 1181 | goto end; |
| 1182 | case SEEK_SET: |
| 1183 | /* |
| 1184 | * We only allow to seek to 0. |
| 1185 | */ |
| 1186 | if (index != 0) { |
| 1187 | fprintf(stderr, "[error] Arbitrary seek in lttng-live " |
| 1188 | "trace not supported\n"); |
| 1189 | pos->offset = EOF; |
| 1190 | ret = -1; |
| 1191 | goto end; |
| 1192 | } |
| 1193 | |
| 1194 | ret = 0; |
| 1195 | goto end; |
| 1196 | |
| 1197 | default: |
| 1198 | fprintf(stderr, "[error] Invalid seek parameter\n"); |
| 1199 | assert(0); |
| 1200 | } |
| 1201 | |
| 1202 | end: |
| 1203 | return ret; |
| 1204 | } |
| 1205 | |
| 1206 | static |
| 1207 | void ctf_live_packet_seek(struct bt_stream_pos *stream_pos, size_t index, |
| 1208 | int whence) |
| 1209 | { |
| 1210 | struct ctf_stream_pos *pos; |
| 1211 | struct ctf_file_stream *file_stream; |
| 1212 | struct packet_index *prev_index = NULL, *cur_index; |
| 1213 | struct lttng_live_viewer_stream *viewer_stream; |
| 1214 | struct lttng_live_session *session; |
| 1215 | uint64_t stream_id = -1ULL; |
| 1216 | int ret; |
| 1217 | |
| 1218 | pos = ctf_pos(stream_pos); |
| 1219 | file_stream = container_of(pos, struct ctf_file_stream, pos); |
| 1220 | viewer_stream = (struct lttng_live_viewer_stream *) pos->priv; |
| 1221 | session = viewer_stream->session; |
| 1222 | |
| 1223 | ret = handle_seek_position(index, whence, viewer_stream, pos, |
| 1224 | file_stream); |
| 1225 | if (ret != 0) { |
| 1226 | return; |
| 1227 | } |
| 1228 | |
| 1229 | retry: |
| 1230 | switch (pos->packet_index->len) { |
| 1231 | case 0: |
| 1232 | g_array_set_size(pos->packet_index, 1); |
| 1233 | cur_index = &g_array_index(pos->packet_index, |
| 1234 | struct packet_index, 0); |
| 1235 | break; |
| 1236 | case 1: |
| 1237 | g_array_set_size(pos->packet_index, 2); |
| 1238 | prev_index = &g_array_index(pos->packet_index, |
| 1239 | struct packet_index, 0); |
| 1240 | cur_index = &g_array_index(pos->packet_index, |
| 1241 | struct packet_index, 1); |
| 1242 | break; |
| 1243 | case 2: |
| 1244 | g_array_index(pos->packet_index, |
| 1245 | struct packet_index, 0) = |
| 1246 | g_array_index(pos->packet_index, |
| 1247 | struct packet_index, 1); |
| 1248 | prev_index = &g_array_index(pos->packet_index, |
| 1249 | struct packet_index, 0); |
| 1250 | cur_index = &g_array_index(pos->packet_index, |
| 1251 | struct packet_index, 1); |
| 1252 | break; |
| 1253 | default: |
| 1254 | abort(); |
| 1255 | break; |
| 1256 | } |
| 1257 | |
| 1258 | if (viewer_stream->data_pending) { |
| 1259 | lttng_index_to_packet_index(&viewer_stream->current_index, cur_index); |
| 1260 | } else { |
| 1261 | printf_verbose("get_next_index for stream %" PRIu64 "\n", viewer_stream->id); |
| 1262 | ret = get_next_index(session->ctx, viewer_stream, cur_index, &stream_id); |
| 1263 | if (ret < 0) { |
| 1264 | pos->offset = EOF; |
| 1265 | if (!lttng_live_should_quit()) { |
| 1266 | fprintf(stderr, "[error] get_next_index failed\n"); |
| 1267 | } |
| 1268 | return; |
| 1269 | } |
| 1270 | printf_verbose("Index received : packet_size : %" PRIu64 |
| 1271 | ", offset %" PRIu64 ", content_size %" PRIu64 |
| 1272 | ", timestamp_end : %" PRIu64 "\n", |
| 1273 | cur_index->packet_size, cur_index->offset, |
| 1274 | cur_index->content_size, |
| 1275 | cur_index->ts_cycles.timestamp_end); |
| 1276 | |
| 1277 | } |
| 1278 | |
| 1279 | /* |
| 1280 | * On the first time we receive an index, the stream_id needs to |
| 1281 | * be set for the stream in order to use it, we don't want any |
| 1282 | * data at this stage. |
| 1283 | */ |
| 1284 | if (file_stream->parent.stream_id == -1ULL) { |
| 1285 | /* |
| 1286 | * Warning: with lttng-tools < 2.4.2, the beacon does not |
| 1287 | * contain the real stream ID, it is memset to 0, so this |
| 1288 | * might create a problem when a session has multiple |
| 1289 | * channels. We can't detect it at this stage, lttng-tools |
| 1290 | * has to be upgraded to fix this problem. |
| 1291 | */ |
| 1292 | printf_verbose("Assigning stream_id %" PRIu64 "\n", |
| 1293 | stream_id); |
| 1294 | file_stream->parent.stream_id = stream_id; |
| 1295 | viewer_stream->ctf_stream_id = stream_id; |
| 1296 | |
| 1297 | return; |
| 1298 | } |
| 1299 | |
| 1300 | pos->packet_size = cur_index->packet_size; |
| 1301 | pos->content_size = cur_index->content_size; |
| 1302 | pos->mmap_base_offset = 0; |
| 1303 | if (cur_index->offset == EOF) { |
| 1304 | pos->offset = EOF; |
| 1305 | } else { |
| 1306 | pos->offset = 0; |
| 1307 | } |
| 1308 | |
| 1309 | if (cur_index->content_size == 0) { |
| 1310 | /* Beacon packet index */ |
| 1311 | if (file_stream->parent.stream_class) { |
| 1312 | file_stream->parent.cycles_timestamp = |
| 1313 | cur_index->ts_cycles.timestamp_end; |
| 1314 | file_stream->parent.real_timestamp = ctf_get_real_timestamp( |
| 1315 | &file_stream->parent, |
| 1316 | cur_index->ts_cycles.timestamp_end); |
| 1317 | |
| 1318 | /* |
| 1319 | * Duplicate the data from the previous index, because |
| 1320 | * the one we just received is only a beacon with no |
| 1321 | * relevant information except the timestamp_end. We |
| 1322 | * don't need to keep this timestamp_end because we already |
| 1323 | * updated the file_stream timestamps, so we only need |
| 1324 | * to keep the last real index data as prev_index. That |
| 1325 | * way, we keep the original prev timestamps and |
| 1326 | * discarded events counter. This is the same behaviour |
| 1327 | * as if we were reading a local trace, we would not |
| 1328 | * have fake indexes between real indexes. |
| 1329 | */ |
| 1330 | memcpy(cur_index, prev_index, sizeof(struct packet_index)); |
| 1331 | } |
| 1332 | } else { |
| 1333 | /* Real packet index */ |
| 1334 | if (file_stream->parent.stream_class) { |
| 1335 | /* Convert the timestamps and append to the real_index. */ |
| 1336 | cur_index->ts_real.timestamp_begin = ctf_get_real_timestamp( |
| 1337 | &file_stream->parent, |
| 1338 | cur_index->ts_cycles.timestamp_begin); |
| 1339 | cur_index->ts_real.timestamp_end = ctf_get_real_timestamp( |
| 1340 | &file_stream->parent, |
| 1341 | cur_index->ts_cycles.timestamp_end); |
| 1342 | } |
| 1343 | |
| 1344 | ctf_update_current_packet_index(&file_stream->parent, |
| 1345 | prev_index, cur_index); |
| 1346 | |
| 1347 | /* |
| 1348 | * We need to check if we are in trace read or called |
| 1349 | * from packet indexing. In this last case, the |
| 1350 | * collection is not there, so we cannot print the |
| 1351 | * timestamps. |
| 1352 | */ |
| 1353 | if ((&file_stream->parent)->stream_class->trace->parent.collection) { |
| 1354 | ctf_print_discarded_lost(stderr, &file_stream->parent); |
| 1355 | } |
| 1356 | |
| 1357 | file_stream->parent.cycles_timestamp = |
| 1358 | cur_index->ts_cycles.timestamp_begin; |
| 1359 | file_stream->parent.real_timestamp = |
| 1360 | cur_index->ts_real.timestamp_begin; |
| 1361 | } |
| 1362 | |
| 1363 | /* |
| 1364 | * Flush the output between attempts to grab a packet, thus |
| 1365 | * ensuring we flush at least at the periodical timer period. |
| 1366 | * This ensures the output remains reactive for interactive users and |
| 1367 | * that the output is flushed when redirected to a file by the shell. |
| 1368 | */ |
| 1369 | if (fflush(LTTNG_LIVE_OUTPUT_FP) < 0) { |
| 1370 | perror("fflush"); |
| 1371 | goto end; |
| 1372 | } |
| 1373 | |
| 1374 | if (pos->packet_size == 0 || pos->offset == EOF) { |
| 1375 | goto end; |
| 1376 | } |
| 1377 | |
| 1378 | printf_verbose("get_data_packet for stream %" PRIu64 "\n", |
| 1379 | viewer_stream->id); |
| 1380 | ret = get_data_packet(session->ctx, pos, viewer_stream, |
| 1381 | cur_index->offset, |
| 1382 | cur_index->packet_size / CHAR_BIT); |
| 1383 | if (ret == -2) { |
| 1384 | goto retry; |
| 1385 | } else if (ret < 0) { |
| 1386 | pos->offset = EOF; |
| 1387 | if (!lttng_live_should_quit()) { |
| 1388 | fprintf(stderr, "[error] get_data_packet failed\n"); |
| 1389 | } |
| 1390 | return; |
| 1391 | } |
| 1392 | viewer_stream->data_pending = 0; |
| 1393 | |
| 1394 | read_packet_header(pos, file_stream); |
| 1395 | |
| 1396 | end: |
| 1397 | return; |
| 1398 | } |
| 1399 | |
| 1400 | int lttng_live_create_viewer_session(struct lttng_live_ctx *ctx) |
| 1401 | { |
| 1402 | struct lttng_viewer_cmd cmd; |
| 1403 | struct lttng_viewer_create_session_response resp; |
| 1404 | int ret; |
| 1405 | ssize_t ret_len; |
| 1406 | |
| 1407 | if (lttng_live_should_quit()) { |
| 1408 | ret = -1; |
| 1409 | goto end; |
| 1410 | } |
| 1411 | |
| 1412 | cmd.cmd = htobe32(LTTNG_VIEWER_CREATE_SESSION); |
| 1413 | cmd.data_size = htobe64((uint64_t) 0); |
| 1414 | cmd.cmd_version = htobe32(0); |
| 1415 | |
| 1416 | ret_len = lttng_live_send(ctx->control_sock, &cmd, sizeof(cmd)); |
| 1417 | if (ret_len < 0) { |
| 1418 | perror("[error] Error sending cmd"); |
| 1419 | goto error; |
| 1420 | } |
| 1421 | assert(ret_len == sizeof(cmd)); |
| 1422 | |
| 1423 | ret_len = lttng_live_recv(ctx->control_sock, &resp, sizeof(resp)); |
| 1424 | if (ret_len == 0) { |
| 1425 | fprintf(stderr, "[error] Remote side has closed connection\n"); |
| 1426 | goto error; |
| 1427 | } |
| 1428 | if (ret_len < 0) { |
| 1429 | perror("[error] Error receiving create session reply"); |
| 1430 | goto error; |
| 1431 | } |
| 1432 | assert(ret_len == sizeof(resp)); |
| 1433 | |
| 1434 | if (be32toh(resp.status) != LTTNG_VIEWER_CREATE_SESSION_OK) { |
| 1435 | fprintf(stderr, "[error] Error creating viewer session\n"); |
| 1436 | goto error; |
| 1437 | } |
| 1438 | ret = 0; |
| 1439 | end: |
| 1440 | return ret; |
| 1441 | |
| 1442 | error: |
| 1443 | return -1; |
| 1444 | } |
| 1445 | |
| 1446 | static |
| 1447 | int del_traces(gpointer key, gpointer value, gpointer user_data) |
| 1448 | { |
| 1449 | struct bt_context *bt_ctx = user_data; |
| 1450 | struct lttng_live_ctf_trace *trace = value; |
| 1451 | int ret; |
| 1452 | struct lttng_live_viewer_stream *lvstream, *tmp; |
| 1453 | |
| 1454 | /* |
| 1455 | * We don't have ownership of the live viewer stream, just |
| 1456 | * remove them from our list. |
| 1457 | */ |
| 1458 | bt_list_for_each_entry_safe(lvstream, tmp, &trace->stream_list, |
| 1459 | trace_stream_node) { |
| 1460 | lvstream->in_trace = 0; |
| 1461 | bt_list_del(&lvstream->trace_stream_node); |
| 1462 | } |
| 1463 | if (trace->in_use) { |
| 1464 | ret = bt_context_remove_trace(bt_ctx, trace->trace_id); |
| 1465 | if (ret < 0) |
| 1466 | fprintf(stderr, "[error] removing trace from context\n"); |
| 1467 | } |
| 1468 | |
| 1469 | /* remove the key/value pair from the HT. */ |
| 1470 | return 1; |
| 1471 | } |
| 1472 | |
| 1473 | static |
| 1474 | int add_one_trace(struct lttng_live_ctx *ctx, |
| 1475 | struct lttng_live_ctf_trace *trace) |
| 1476 | { |
| 1477 | int ret; |
| 1478 | struct bt_context *bt_ctx = ctx->bt_ctx; |
| 1479 | struct lttng_live_viewer_stream *stream; |
| 1480 | struct bt_mmap_stream *new_mmap_stream; |
| 1481 | struct bt_mmap_stream_list mmap_list; |
| 1482 | struct bt_trace_descriptor *td; |
| 1483 | struct bt_trace_handle *handle; |
| 1484 | |
| 1485 | printf_verbose("Add one trace ctf_trace_id: %" PRIu64 |
| 1486 | " (metadata_stream: %p)\n", |
| 1487 | trace->ctf_trace_id, trace->metadata_stream); |
| 1488 | /* |
| 1489 | * We don't know how many streams we will receive for a trace, so |
| 1490 | * once we are done receiving the traces, we add all the traces |
| 1491 | * received to the bt_context. |
| 1492 | * We can receive streams during the attach command or the |
| 1493 | * get_new_streams, so we have to make sure not to add multiple |
| 1494 | * times the same traces. |
| 1495 | * If a trace is already in the context, we just skip this function. |
| 1496 | */ |
| 1497 | if (trace->in_use) { |
| 1498 | printf_verbose("Trace already in use\n"); |
| 1499 | ret = 0; |
| 1500 | goto end; |
| 1501 | } |
| 1502 | |
| 1503 | BT_INIT_LIST_HEAD(&mmap_list.head); |
| 1504 | |
| 1505 | bt_list_for_each_entry(stream, &trace->stream_list, trace_stream_node) { |
| 1506 | if (!stream->metadata_flag) { |
| 1507 | new_mmap_stream = zmalloc(sizeof(struct bt_mmap_stream)); |
| 1508 | new_mmap_stream->priv = (void *) stream; |
| 1509 | new_mmap_stream->fd = -1; |
| 1510 | bt_list_add(&new_mmap_stream->list, &mmap_list.head); |
| 1511 | } else { |
| 1512 | char *metadata_buf = NULL; |
| 1513 | |
| 1514 | /* Get all possible metadata before starting */ |
| 1515 | ret = get_new_metadata(ctx, stream, &metadata_buf); |
| 1516 | if (ret) { |
| 1517 | free(metadata_buf); |
| 1518 | goto end_free; |
| 1519 | } |
| 1520 | if (!stream->metadata_len) { |
| 1521 | fprintf(stderr, "[error] empty metadata\n"); |
| 1522 | ret = -1; |
| 1523 | free(metadata_buf); |
| 1524 | goto end_free; |
| 1525 | } |
| 1526 | |
| 1527 | printf_verbose("Metadata stream found\n"); |
| 1528 | trace->metadata_fp = babeltrace_fmemopen(metadata_buf, |
| 1529 | stream->metadata_len, "rb"); |
| 1530 | if (!trace->metadata_fp) { |
| 1531 | perror("Metadata fmemopen"); |
| 1532 | ret = -1; |
| 1533 | free(metadata_buf); |
| 1534 | goto end_free; |
| 1535 | } |
| 1536 | } |
| 1537 | } |
| 1538 | |
| 1539 | if (!trace->metadata_fp) { |
| 1540 | fprintf(stderr, "[error] No metadata stream opened\n"); |
| 1541 | ret = -1; |
| 1542 | goto end_free; |
| 1543 | } |
| 1544 | |
| 1545 | ret = bt_context_add_trace(bt_ctx, NULL, "ctf", |
| 1546 | ctf_live_packet_seek, &mmap_list, trace->metadata_fp); |
| 1547 | if (ret < 0) { |
| 1548 | fprintf(stderr, "[error] Error adding trace\n"); |
| 1549 | ret = -1; |
| 1550 | goto end_free; |
| 1551 | } |
| 1552 | trace->metadata_stream->metadata_len = 0; |
| 1553 | |
| 1554 | handle = (struct bt_trace_handle *) g_hash_table_lookup( |
| 1555 | bt_ctx->trace_handles, |
| 1556 | (gpointer) (unsigned long) ret); |
| 1557 | td = handle->td; |
| 1558 | trace->handle = handle; |
| 1559 | if (bt_ctx->current_iterator) { |
| 1560 | bt_iter_add_trace(bt_ctx->current_iterator, td); |
| 1561 | } |
| 1562 | |
| 1563 | trace->trace_id = ret; |
| 1564 | trace->in_use = 1; |
| 1565 | printf_verbose("Trace now in use, id = %d\n", trace->trace_id); |
| 1566 | |
| 1567 | goto end; |
| 1568 | |
| 1569 | end_free: |
| 1570 | bt_context_put(bt_ctx); |
| 1571 | end: |
| 1572 | return ret; |
| 1573 | } |
| 1574 | |
| 1575 | static |
| 1576 | int add_traces(struct lttng_live_ctx *ctx) |
| 1577 | { |
| 1578 | int ret; |
| 1579 | struct lttng_live_ctf_trace *trace; |
| 1580 | GHashTableIter it; |
| 1581 | gpointer key; |
| 1582 | gpointer value; |
| 1583 | |
| 1584 | printf_verbose("Begin add traces\n"); |
| 1585 | g_hash_table_iter_init(&it, ctx->session->ctf_traces); |
| 1586 | while (g_hash_table_iter_next(&it, &key, &value)) { |
| 1587 | trace = (struct lttng_live_ctf_trace *) value; |
| 1588 | ret = add_one_trace(ctx, trace); |
| 1589 | if (ret < 0) { |
| 1590 | goto end; |
| 1591 | } |
| 1592 | } |
| 1593 | |
| 1594 | ret = 0; |
| 1595 | |
| 1596 | end: |
| 1597 | printf_verbose("End add traces\n"); |
| 1598 | return ret; |
| 1599 | } |
| 1600 | |
| 1601 | /* |
| 1602 | * Request new streams for a session. |
| 1603 | * Returns the number of streams received or a negative value on error. |
| 1604 | */ |
| 1605 | int lttng_live_get_new_streams(struct lttng_live_ctx *ctx, uint64_t id) |
| 1606 | { |
| 1607 | struct lttng_viewer_cmd cmd; |
| 1608 | struct lttng_viewer_new_streams_request rq; |
| 1609 | struct lttng_viewer_new_streams_response rp; |
| 1610 | struct lttng_viewer_stream stream; |
| 1611 | int ret, i, nb_streams = 0; |
| 1612 | ssize_t ret_len; |
| 1613 | uint32_t stream_count; |
| 1614 | const size_t cmd_buf_len = sizeof(cmd) + sizeof(rq); |
| 1615 | char cmd_buf[cmd_buf_len]; |
| 1616 | |
| 1617 | if (lttng_live_should_quit()) { |
| 1618 | ret = -1; |
| 1619 | goto end; |
| 1620 | } |
| 1621 | |
| 1622 | cmd.cmd = htobe32(LTTNG_VIEWER_GET_NEW_STREAMS); |
| 1623 | cmd.data_size = htobe64((uint64_t) sizeof(rq)); |
| 1624 | cmd.cmd_version = htobe32(0); |
| 1625 | |
| 1626 | memset(&rq, 0, sizeof(rq)); |
| 1627 | rq.session_id = htobe64(id); |
| 1628 | |
| 1629 | /* |
| 1630 | * Merge the cmd and connection request to prevent a write-write |
| 1631 | * sequence on the TCP socket. Otherwise, a delayed ACK will prevent the |
| 1632 | * second write to be performed quickly in presence of Nagle's algorithm. |
| 1633 | */ |
| 1634 | memcpy(cmd_buf, &cmd, sizeof(cmd)); |
| 1635 | memcpy(cmd_buf + sizeof(cmd), &rq, sizeof(rq)); |
| 1636 | |
| 1637 | ret_len = lttng_live_send(ctx->control_sock, cmd_buf, cmd_buf_len); |
| 1638 | if (ret_len < 0) { |
| 1639 | perror("[error] Error sending get_new_streams cmd and request"); |
| 1640 | goto error; |
| 1641 | } |
| 1642 | assert(ret_len == cmd_buf_len); |
| 1643 | |
| 1644 | ret_len = lttng_live_recv(ctx->control_sock, &rp, sizeof(rp)); |
| 1645 | if (ret_len == 0) { |
| 1646 | fprintf(stderr, "[error] Remote side has closed connection\n"); |
| 1647 | goto error; |
| 1648 | } |
| 1649 | if (ret_len < 0) { |
| 1650 | perror("[error] Error receiving get_new_streams response"); |
| 1651 | goto error; |
| 1652 | } |
| 1653 | assert(ret_len == sizeof(rp)); |
| 1654 | |
| 1655 | switch(be32toh(rp.status)) { |
| 1656 | case LTTNG_VIEWER_NEW_STREAMS_OK: |
| 1657 | break; |
| 1658 | case LTTNG_VIEWER_NEW_STREAMS_NO_NEW: |
| 1659 | ret = 0; |
| 1660 | goto end; |
| 1661 | case LTTNG_VIEWER_NEW_STREAMS_HUP: |
| 1662 | ret = -LTTNG_VIEWER_NEW_STREAMS_HUP; |
| 1663 | goto end; |
| 1664 | case LTTNG_VIEWER_NEW_STREAMS_ERR: |
| 1665 | fprintf(stderr, "[error] get_new_streams error\n"); |
| 1666 | goto error; |
| 1667 | default: |
| 1668 | fprintf(stderr, "[error] Unknown return code %u\n", |
| 1669 | be32toh(rp.status)); |
| 1670 | goto error; |
| 1671 | } |
| 1672 | |
| 1673 | stream_count = be32toh(rp.streams_count); |
| 1674 | ctx->session->stream_count += stream_count; |
| 1675 | /* |
| 1676 | * When the session is created but not started, we do an active wait |
| 1677 | * until it starts. It allows the viewer to start processing the trace |
| 1678 | * as soon as the session starts. |
| 1679 | */ |
| 1680 | if (ctx->session->stream_count == 0) { |
| 1681 | ret = 0; |
| 1682 | goto end; |
| 1683 | } |
| 1684 | printf_verbose("Waiting for %d streams:\n", stream_count); |
| 1685 | |
| 1686 | for (i = 0; i < stream_count; i++) { |
| 1687 | struct lttng_live_viewer_stream *lvstream; |
| 1688 | |
| 1689 | lvstream = g_new0(struct lttng_live_viewer_stream, 1); |
| 1690 | ret_len = lttng_live_recv(ctx->control_sock, &stream, |
| 1691 | sizeof(stream)); |
| 1692 | if (ret_len == 0) { |
| 1693 | fprintf(stderr, "[error] Remote side has closed connection\n"); |
| 1694 | g_free(lvstream); |
| 1695 | goto error; |
| 1696 | } |
| 1697 | if (ret_len < 0) { |
| 1698 | perror("[error] Error receiving stream"); |
| 1699 | g_free(lvstream); |
| 1700 | goto error; |
| 1701 | } |
| 1702 | assert(ret_len == sizeof(stream)); |
| 1703 | stream.path_name[LTTNG_VIEWER_PATH_MAX - 1] = '\0'; |
| 1704 | stream.channel_name[LTTNG_VIEWER_NAME_MAX - 1] = '\0'; |
| 1705 | |
| 1706 | printf_verbose(" stream %" PRIu64 " : %s/%s\n", |
| 1707 | be64toh(stream.id), stream.path_name, |
| 1708 | stream.channel_name); |
| 1709 | lvstream->id = be64toh(stream.id); |
| 1710 | lvstream->session = ctx->session; |
| 1711 | |
| 1712 | lvstream->mmap_size = 0; |
| 1713 | lvstream->ctf_stream_id = -1ULL; |
| 1714 | |
| 1715 | if (be32toh(stream.metadata_flag)) { |
| 1716 | lvstream->metadata_flag = 1; |
| 1717 | } |
| 1718 | ret = lttng_live_ctf_trace_assign(lvstream, |
| 1719 | be64toh(stream.ctf_trace_id)); |
| 1720 | if (ret < 0) { |
| 1721 | g_free(lvstream); |
| 1722 | goto error; |
| 1723 | } |
| 1724 | nb_streams++; |
| 1725 | bt_list_add(&lvstream->session_stream_node, |
| 1726 | &ctx->session->stream_list); |
| 1727 | } |
| 1728 | ret = nb_streams; |
| 1729 | end: |
| 1730 | return ret; |
| 1731 | |
| 1732 | error: |
| 1733 | return -1; |
| 1734 | } |
| 1735 | |
| 1736 | int lttng_live_read(struct lttng_live_ctx *ctx) |
| 1737 | { |
| 1738 | int ret = -1; |
| 1739 | int i; |
| 1740 | struct bt_ctf_iter *iter; |
| 1741 | const struct bt_ctf_event *event; |
| 1742 | struct bt_iter_pos begin_pos; |
| 1743 | struct bt_trace_descriptor *td_write; |
| 1744 | struct bt_format *fmt_write; |
| 1745 | struct ctf_text_stream_pos *sout; |
| 1746 | uint64_t id; |
| 1747 | |
| 1748 | ctx->bt_ctx = bt_context_create(); |
| 1749 | if (!ctx->bt_ctx) { |
| 1750 | fprintf(stderr, "[error] bt_context_create allocation\n"); |
| 1751 | goto end; |
| 1752 | } |
| 1753 | |
| 1754 | fmt_write = bt_lookup_format(g_quark_from_static_string("text")); |
| 1755 | if (!fmt_write) { |
| 1756 | fprintf(stderr, "[error] ctf-text error\n"); |
| 1757 | goto end_free; |
| 1758 | } |
| 1759 | |
| 1760 | td_write = fmt_write->open_trace(NULL, O_RDWR, NULL, NULL); |
| 1761 | if (!td_write) { |
| 1762 | fprintf(stderr, "[error] Error opening output trace\n"); |
| 1763 | goto end_free; |
| 1764 | } |
| 1765 | |
| 1766 | sout = container_of(td_write, struct ctf_text_stream_pos, |
| 1767 | trace_descriptor); |
| 1768 | if (!sout->parent.event_cb) { |
| 1769 | goto end_free; |
| 1770 | } |
| 1771 | |
| 1772 | ret = lttng_live_create_viewer_session(ctx); |
| 1773 | if (ret < 0) { |
| 1774 | goto end_free; |
| 1775 | } |
| 1776 | |
| 1777 | for (i = 0; i < ctx->session_ids->len; i++) { |
| 1778 | id = g_array_index(ctx->session_ids, uint64_t, i); |
| 1779 | printf_verbose("Attaching to session %" PRIu64 "\n", id); |
| 1780 | ret = lttng_live_attach_session(ctx, id); |
| 1781 | printf_verbose("Attaching session returns %d\n", ret); |
| 1782 | if (ret < 0) { |
| 1783 | if (ret == -LTTNG_VIEWER_ATTACH_UNK) { |
| 1784 | fprintf(stderr, "[error] Unknown session ID\n"); |
| 1785 | } |
| 1786 | goto end_free; |
| 1787 | } |
| 1788 | } |
| 1789 | |
| 1790 | /* |
| 1791 | * As long as the session is active, we try to get new streams. |
| 1792 | */ |
| 1793 | for (;;) { |
| 1794 | int flags; |
| 1795 | |
| 1796 | if (lttng_live_should_quit()) { |
| 1797 | ret = 0; |
| 1798 | goto end_free; |
| 1799 | } |
| 1800 | |
| 1801 | while (!ctx->session->stream_count) { |
| 1802 | if (lttng_live_should_quit() |
| 1803 | || ctx->session_ids->len == 0) { |
| 1804 | ret = 0; |
| 1805 | goto end_free; |
| 1806 | } |
| 1807 | ret = ask_new_streams(ctx); |
| 1808 | if (ret < 0) { |
| 1809 | ret = 0; |
| 1810 | goto end_free; |
| 1811 | } |
| 1812 | if (!ctx->session->stream_count) { |
| 1813 | (void) poll(NULL, 0, ACTIVE_POLL_DELAY); |
| 1814 | } |
| 1815 | } |
| 1816 | |
| 1817 | ret = add_traces(ctx); |
| 1818 | if (ret < 0) { |
| 1819 | goto end_free; |
| 1820 | } |
| 1821 | |
| 1822 | begin_pos.type = BT_SEEK_BEGIN; |
| 1823 | iter = bt_ctf_iter_create(ctx->bt_ctx, &begin_pos, NULL); |
| 1824 | if (!iter) { |
| 1825 | if (lttng_live_should_quit()) { |
| 1826 | ret = 0; |
| 1827 | goto end_free; |
| 1828 | } |
| 1829 | fprintf(stderr, "[error] Iterator creation error\n"); |
| 1830 | goto end_free; |
| 1831 | } |
| 1832 | for (;;) { |
| 1833 | if (lttng_live_should_quit()) { |
| 1834 | ret = 0; |
| 1835 | goto end_free; |
| 1836 | } |
| 1837 | event = bt_ctf_iter_read_event_flags(iter, &flags); |
| 1838 | if (!(flags & BT_ITER_FLAG_RETRY)) { |
| 1839 | if (!event) { |
| 1840 | /* End of trace */ |
| 1841 | break; |
| 1842 | } |
| 1843 | ret = sout->parent.event_cb(&sout->parent, |
| 1844 | event->parent->stream); |
| 1845 | if (ret) { |
| 1846 | fprintf(stderr, "[error] Writing " |
| 1847 | "event failed.\n"); |
| 1848 | goto end_free; |
| 1849 | } |
| 1850 | } |
| 1851 | ret = bt_iter_next(bt_ctf_get_iter(iter)); |
| 1852 | if (ret < 0) { |
| 1853 | goto end_free; |
| 1854 | } |
| 1855 | } |
| 1856 | bt_ctf_iter_destroy(iter); |
| 1857 | g_hash_table_foreach_remove(ctx->session->ctf_traces, |
| 1858 | del_traces, ctx->bt_ctx); |
| 1859 | ctx->session->stream_count = 0; |
| 1860 | } |
| 1861 | |
| 1862 | end_free: |
| 1863 | g_hash_table_foreach_remove(ctx->session->ctf_traces, |
| 1864 | del_traces, ctx->bt_ctx); |
| 1865 | bt_context_put(ctx->bt_ctx); |
| 1866 | end: |
| 1867 | if (lttng_live_should_quit()) { |
| 1868 | ret = 0; |
| 1869 | } |
| 1870 | return ret; |
| 1871 | } |