| 1 | /* |
| 2 | * Copyright (C) 2013 - Julien Desfossez <jdesfossez@efficios.com> |
| 3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
| 4 | * |
| 5 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
| 6 | * of this software and associated documentation files (the "Software"), to deal |
| 7 | * in the Software without restriction, including without limitation the rights |
| 8 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| 9 | * copies of the Software, and to permit persons to whom the Software is |
| 10 | * furnished to do so, subject to the following conditions: |
| 11 | * |
| 12 | * The above copyright notice and this permission notice shall be included in |
| 13 | * all copies or substantial portions of the Software. |
| 14 | * |
| 15 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 16 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 17 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| 18 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 19 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 20 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
| 21 | * SOFTWARE. |
| 22 | */ |
| 23 | |
| 24 | #include <sys/socket.h> |
| 25 | #include <sys/types.h> |
| 26 | #include <netinet/in.h> |
| 27 | #include <netdb.h> |
| 28 | #include <stdio.h> |
| 29 | #include <stdlib.h> |
| 30 | #include <unistd.h> |
| 31 | #include <errno.h> |
| 32 | #include <inttypes.h> |
| 33 | #include <fcntl.h> |
| 34 | #include <poll.h> |
| 35 | |
| 36 | #include <babeltrace/ctf/ctf-index.h> |
| 37 | |
| 38 | #include <babeltrace/babeltrace.h> |
| 39 | #include <babeltrace/endian.h> |
| 40 | #include <babeltrace/ctf/events.h> |
| 41 | #include <babeltrace/ctf/callbacks.h> |
| 42 | #include <babeltrace/ctf/iterator.h> |
| 43 | |
| 44 | /* for packet_index */ |
| 45 | #include <babeltrace/ctf/types.h> |
| 46 | |
| 47 | #include <babeltrace/ctf/metadata.h> |
| 48 | #include <babeltrace/ctf-text/types.h> |
| 49 | #include <babeltrace/ctf/events-internal.h> |
| 50 | #include <formats/ctf/events-private.h> |
| 51 | |
| 52 | #include <babeltrace/compat/memstream.h> |
| 53 | #include <babeltrace/compat/send.h> |
| 54 | #include <babeltrace/compat/string.h> |
| 55 | #include <babeltrace/compat/mman.h> |
| 56 | |
| 57 | #include "lttng-live.h" |
| 58 | #include "lttng-viewer-abi.h" |
| 59 | |
| 60 | #define ACTIVE_POLL_DELAY 100 /* ms */ |
| 61 | |
| 62 | /* |
| 63 | * Memory allocation zeroed |
| 64 | */ |
| 65 | #define zmalloc(x) calloc(1, x) |
| 66 | |
| 67 | #ifndef max_t |
| 68 | #define max_t(type, a, b) \ |
| 69 | ((type) (a) > (type) (b) ? (type) (a) : (type) (b)) |
| 70 | #endif |
| 71 | |
| 72 | static void ctf_live_packet_seek(struct bt_stream_pos *stream_pos, |
| 73 | size_t index, int whence); |
| 74 | static int add_traces(struct lttng_live_ctx *ctx); |
| 75 | static int del_traces(gpointer key, gpointer value, gpointer user_data); |
| 76 | static int get_new_metadata(struct lttng_live_ctx *ctx, |
| 77 | struct lttng_live_viewer_stream *viewer_stream, |
| 78 | char **metadata_buf); |
| 79 | |
| 80 | static |
| 81 | ssize_t lttng_live_recv(int fd, void *buf, size_t len) |
| 82 | { |
| 83 | ssize_t ret; |
| 84 | size_t copied = 0, to_copy = len; |
| 85 | |
| 86 | do { |
| 87 | ret = recv(fd, buf + copied, to_copy, 0); |
| 88 | if (ret > 0) { |
| 89 | assert(ret <= to_copy); |
| 90 | copied += ret; |
| 91 | to_copy -= ret; |
| 92 | } |
| 93 | } while ((ret > 0 && to_copy > 0) |
| 94 | || (ret < 0 && errno == EINTR)); |
| 95 | if (ret > 0) |
| 96 | ret = copied; |
| 97 | /* ret = 0 means orderly shutdown, ret < 0 is error. */ |
| 98 | return ret; |
| 99 | } |
| 100 | |
| 101 | static |
| 102 | ssize_t lttng_live_send(int fd, const void *buf, size_t len) |
| 103 | { |
| 104 | ssize_t ret; |
| 105 | |
| 106 | do { |
| 107 | ret = bt_send_nosigpipe(fd, buf, len); |
| 108 | } while (ret < 0 && errno == EINTR); |
| 109 | return ret; |
| 110 | } |
| 111 | |
| 112 | int lttng_live_connect_viewer(struct lttng_live_ctx *ctx) |
| 113 | { |
| 114 | struct hostent *host; |
| 115 | struct sockaddr_in server_addr; |
| 116 | int ret; |
| 117 | |
| 118 | if (lttng_live_should_quit()) { |
| 119 | ret = -1; |
| 120 | goto end; |
| 121 | } |
| 122 | |
| 123 | host = gethostbyname(ctx->relay_hostname); |
| 124 | if (!host) { |
| 125 | fprintf(stderr, "[error] Cannot lookup hostname %s\n", |
| 126 | ctx->relay_hostname); |
| 127 | goto error; |
| 128 | } |
| 129 | |
| 130 | if ((ctx->control_sock = socket(AF_INET, SOCK_STREAM, 0)) == -1) { |
| 131 | perror("Socket"); |
| 132 | goto error; |
| 133 | } |
| 134 | |
| 135 | server_addr.sin_family = AF_INET; |
| 136 | server_addr.sin_port = htons(ctx->port); |
| 137 | server_addr.sin_addr = *((struct in_addr *) host->h_addr); |
| 138 | memset(&(server_addr.sin_zero), 0, 8); |
| 139 | |
| 140 | if (connect(ctx->control_sock, (struct sockaddr *) &server_addr, |
| 141 | sizeof(struct sockaddr)) == -1) { |
| 142 | perror("Connect"); |
| 143 | goto error; |
| 144 | } |
| 145 | |
| 146 | ret = 0; |
| 147 | |
| 148 | end: |
| 149 | return ret; |
| 150 | |
| 151 | error: |
| 152 | fprintf(stderr, "[error] Connection failed\n"); |
| 153 | return -1; |
| 154 | } |
| 155 | |
| 156 | int lttng_live_establish_connection(struct lttng_live_ctx *ctx) |
| 157 | { |
| 158 | struct lttng_viewer_cmd cmd; |
| 159 | struct lttng_viewer_connect connect; |
| 160 | const size_t cmd_buf_len = sizeof(cmd) + sizeof(connect); |
| 161 | char cmd_buf[cmd_buf_len]; |
| 162 | int ret; |
| 163 | ssize_t ret_len; |
| 164 | |
| 165 | if (lttng_live_should_quit()) { |
| 166 | ret = -1; |
| 167 | goto end; |
| 168 | } |
| 169 | |
| 170 | cmd.cmd = htobe32(LTTNG_VIEWER_CONNECT); |
| 171 | cmd.data_size = htobe64((uint64_t) sizeof(connect)); |
| 172 | cmd.cmd_version = htobe32(0); |
| 173 | |
| 174 | connect.viewer_session_id = -1ULL; /* will be set on recv */ |
| 175 | connect.major = htobe32(LTTNG_LIVE_MAJOR); |
| 176 | connect.minor = htobe32(LTTNG_LIVE_MINOR); |
| 177 | connect.type = htobe32(LTTNG_VIEWER_CLIENT_COMMAND); |
| 178 | |
| 179 | /* |
| 180 | * Merge the cmd and connection request to prevent a write-write |
| 181 | * sequence on the TCP socket. Otherwise, a delayed ACK will prevent the |
| 182 | * second write to be performed quickly in presence of Nagle's algorithm. |
| 183 | */ |
| 184 | memcpy(cmd_buf, &cmd, sizeof(cmd)); |
| 185 | memcpy(cmd_buf + sizeof(cmd), &connect, sizeof(connect)); |
| 186 | |
| 187 | ret_len = lttng_live_send(ctx->control_sock, cmd_buf, cmd_buf_len); |
| 188 | if (ret_len < 0) { |
| 189 | perror("[error] Error sending cmd for establishing session"); |
| 190 | goto error; |
| 191 | } |
| 192 | assert(ret_len == cmd_buf_len); |
| 193 | |
| 194 | ret_len = lttng_live_recv(ctx->control_sock, &connect, sizeof(connect)); |
| 195 | if (ret_len == 0) { |
| 196 | fprintf(stderr, "[error] Remote side has closed connection\n"); |
| 197 | goto error; |
| 198 | } |
| 199 | if (ret_len < 0) { |
| 200 | perror("[error] Error receiving version"); |
| 201 | goto error; |
| 202 | } |
| 203 | assert(ret_len == sizeof(connect)); |
| 204 | |
| 205 | printf_verbose("Received viewer session ID : %" PRIu64 "\n", |
| 206 | be64toh(connect.viewer_session_id)); |
| 207 | printf_verbose("Relayd version : %u.%u\n", be32toh(connect.major), |
| 208 | be32toh(connect.minor)); |
| 209 | |
| 210 | if (LTTNG_LIVE_MAJOR != be32toh(connect.major)) { |
| 211 | fprintf(stderr, "[error] Incompatible lttng-relayd protocol\n"); |
| 212 | goto error; |
| 213 | } |
| 214 | /* Use the smallest protocol version implemented. */ |
| 215 | if (LTTNG_LIVE_MINOR > be32toh(connect.minor)) { |
| 216 | ctx->minor = be32toh(connect.minor); |
| 217 | } else { |
| 218 | ctx->minor = LTTNG_LIVE_MINOR; |
| 219 | } |
| 220 | ctx->major = LTTNG_LIVE_MAJOR; |
| 221 | ret = 0; |
| 222 | end: |
| 223 | return ret; |
| 224 | |
| 225 | error: |
| 226 | fprintf(stderr, "[error] Unable to establish connection\n"); |
| 227 | return -1; |
| 228 | } |
| 229 | |
| 230 | static |
| 231 | void free_session_list(GPtrArray *session_list) |
| 232 | { |
| 233 | int i; |
| 234 | struct lttng_live_relay_session *relay_session; |
| 235 | |
| 236 | for (i = 0; i < session_list->len; i++) { |
| 237 | relay_session = g_ptr_array_index(session_list, i); |
| 238 | free(relay_session->name); |
| 239 | free(relay_session->hostname); |
| 240 | } |
| 241 | g_ptr_array_free(session_list, TRUE); |
| 242 | } |
| 243 | |
| 244 | static |
| 245 | void print_session_list(GPtrArray *session_list, const char *path) |
| 246 | { |
| 247 | int i; |
| 248 | struct lttng_live_relay_session *relay_session; |
| 249 | |
| 250 | for (i = 0; i < session_list->len; i++) { |
| 251 | relay_session = g_ptr_array_index(session_list, i); |
| 252 | fprintf(LTTNG_LIVE_OUTPUT_FP, "%s/host/%s/%s (timer = %u, " |
| 253 | "%u stream(s), %u client(s) connected)\n", |
| 254 | path, relay_session->hostname, |
| 255 | relay_session->name, relay_session->timer, |
| 256 | relay_session->streams, relay_session->clients); |
| 257 | } |
| 258 | } |
| 259 | |
| 260 | static |
| 261 | void update_session_list(GPtrArray *session_list, char *hostname, |
| 262 | char *session_name, uint32_t streams, uint32_t clients, |
| 263 | uint32_t timer) |
| 264 | { |
| 265 | int i, found = 0; |
| 266 | struct lttng_live_relay_session *relay_session; |
| 267 | |
| 268 | for (i = 0; i < session_list->len; i++) { |
| 269 | relay_session = g_ptr_array_index(session_list, i); |
| 270 | if ((strncmp(relay_session->hostname, hostname, MAXNAMLEN) == 0) && |
| 271 | strncmp(relay_session->name, |
| 272 | session_name, MAXNAMLEN) == 0) { |
| 273 | relay_session->streams += streams; |
| 274 | if (relay_session->clients < clients) |
| 275 | relay_session->clients = clients; |
| 276 | found = 1; |
| 277 | break; |
| 278 | } |
| 279 | } |
| 280 | if (found) |
| 281 | return; |
| 282 | |
| 283 | relay_session = g_new0(struct lttng_live_relay_session, 1); |
| 284 | relay_session->hostname = bt_strndup(hostname, MAXNAMLEN); |
| 285 | relay_session->name = bt_strndup(session_name, MAXNAMLEN); |
| 286 | relay_session->clients = clients; |
| 287 | relay_session->streams = streams; |
| 288 | relay_session->timer = timer; |
| 289 | g_ptr_array_add(session_list, relay_session); |
| 290 | } |
| 291 | |
| 292 | int lttng_live_list_sessions(struct lttng_live_ctx *ctx, const char *path) |
| 293 | { |
| 294 | struct lttng_viewer_cmd cmd; |
| 295 | struct lttng_viewer_list_sessions list; |
| 296 | struct lttng_viewer_session lsession; |
| 297 | int i, ret, sessions_count, print_list = 0; |
| 298 | ssize_t ret_len; |
| 299 | uint64_t session_id; |
| 300 | GPtrArray *session_list = NULL; |
| 301 | |
| 302 | if (lttng_live_should_quit()) { |
| 303 | ret = -1; |
| 304 | goto end; |
| 305 | } |
| 306 | |
| 307 | if (strlen(ctx->session_name) == 0) { |
| 308 | print_list = 1; |
| 309 | session_list = g_ptr_array_new(); |
| 310 | } |
| 311 | |
| 312 | cmd.cmd = htobe32(LTTNG_VIEWER_LIST_SESSIONS); |
| 313 | cmd.data_size = htobe64((uint64_t) 0); |
| 314 | cmd.cmd_version = htobe32(0); |
| 315 | |
| 316 | ret_len = lttng_live_send(ctx->control_sock, &cmd, sizeof(cmd)); |
| 317 | if (ret_len < 0) { |
| 318 | perror("[error] Error sending cmd"); |
| 319 | goto error; |
| 320 | } |
| 321 | assert(ret_len == sizeof(cmd)); |
| 322 | |
| 323 | ret_len = lttng_live_recv(ctx->control_sock, &list, sizeof(list)); |
| 324 | if (ret_len == 0) { |
| 325 | fprintf(stderr, "[error] Remote side has closed connection\n"); |
| 326 | goto error; |
| 327 | } |
| 328 | if (ret_len < 0) { |
| 329 | perror("[error] Error receiving session list"); |
| 330 | goto error; |
| 331 | } |
| 332 | assert(ret_len == sizeof(list)); |
| 333 | |
| 334 | sessions_count = be32toh(list.sessions_count); |
| 335 | for (i = 0; i < sessions_count; i++) { |
| 336 | ret_len = lttng_live_recv(ctx->control_sock, &lsession, sizeof(lsession)); |
| 337 | if (ret_len == 0) { |
| 338 | fprintf(stderr, "[error] Remote side has closed connection\n"); |
| 339 | goto error; |
| 340 | } |
| 341 | if (ret_len < 0) { |
| 342 | perror("[error] Error receiving session"); |
| 343 | goto error; |
| 344 | } |
| 345 | assert(ret_len == sizeof(lsession)); |
| 346 | lsession.hostname[LTTNG_VIEWER_HOST_NAME_MAX - 1] = '\0'; |
| 347 | lsession.session_name[LTTNG_VIEWER_NAME_MAX - 1] = '\0'; |
| 348 | session_id = be64toh(lsession.id); |
| 349 | |
| 350 | if (print_list) { |
| 351 | update_session_list(session_list, |
| 352 | lsession.hostname, |
| 353 | lsession.session_name, |
| 354 | be32toh(lsession.streams), |
| 355 | be32toh(lsession.clients), |
| 356 | be32toh(lsession.live_timer)); |
| 357 | } else { |
| 358 | if ((strncmp(lsession.session_name, ctx->session_name, |
| 359 | MAXNAMLEN) == 0) && (strncmp(lsession.hostname, |
| 360 | ctx->traced_hostname, MAXNAMLEN) == 0)) { |
| 361 | printf_verbose("Reading from session %" PRIu64 "\n", |
| 362 | session_id); |
| 363 | g_array_append_val(ctx->session_ids, |
| 364 | session_id); |
| 365 | } |
| 366 | } |
| 367 | } |
| 368 | |
| 369 | if (print_list) { |
| 370 | print_session_list(session_list, path); |
| 371 | free_session_list(session_list); |
| 372 | } |
| 373 | ret = 0; |
| 374 | end: |
| 375 | return ret; |
| 376 | |
| 377 | error: |
| 378 | fprintf(stderr, "[error] Unable to list sessions\n"); |
| 379 | return -1; |
| 380 | } |
| 381 | |
| 382 | int lttng_live_ctf_trace_assign(struct lttng_live_viewer_stream *stream, |
| 383 | uint64_t ctf_trace_id) |
| 384 | { |
| 385 | struct lttng_live_ctf_trace *trace; |
| 386 | int ret = 0; |
| 387 | |
| 388 | trace = g_hash_table_lookup(stream->session->ctf_traces, |
| 389 | &ctf_trace_id); |
| 390 | if (!trace) { |
| 391 | trace = g_new0(struct lttng_live_ctf_trace, 1); |
| 392 | trace->ctf_trace_id = ctf_trace_id; |
| 393 | trace->trace_id = -1; |
| 394 | printf_verbose("Create trace ctf_trace_id %" PRIu64 "\n", ctf_trace_id); |
| 395 | BT_INIT_LIST_HEAD(&trace->stream_list); |
| 396 | g_hash_table_insert(stream->session->ctf_traces, |
| 397 | &trace->ctf_trace_id, |
| 398 | trace); |
| 399 | } |
| 400 | if (stream->metadata_flag) |
| 401 | trace->metadata_stream = stream; |
| 402 | |
| 403 | assert(!stream->in_trace); |
| 404 | stream->in_trace = 1; |
| 405 | stream->ctf_trace = trace; |
| 406 | bt_list_add(&stream->trace_stream_node, &trace->stream_list); |
| 407 | |
| 408 | return ret; |
| 409 | } |
| 410 | |
| 411 | static |
| 412 | int open_metadata_fp_write(struct lttng_live_viewer_stream *stream, |
| 413 | char **metadata_buf, size_t *size) |
| 414 | { |
| 415 | int ret = 0; |
| 416 | |
| 417 | stream->metadata_fp_write = |
| 418 | babeltrace_open_memstream(metadata_buf, size); |
| 419 | if (!stream->metadata_fp_write) { |
| 420 | perror("Metadata open_memstream"); |
| 421 | ret = -1; |
| 422 | } |
| 423 | |
| 424 | return ret; |
| 425 | } |
| 426 | |
| 427 | int lttng_live_attach_session(struct lttng_live_ctx *ctx, uint64_t id) |
| 428 | { |
| 429 | struct lttng_viewer_cmd cmd; |
| 430 | struct lttng_viewer_attach_session_request rq; |
| 431 | struct lttng_viewer_attach_session_response rp; |
| 432 | struct lttng_viewer_stream stream; |
| 433 | const size_t cmd_buf_len = sizeof(cmd) + sizeof(rq); |
| 434 | char cmd_buf[cmd_buf_len]; |
| 435 | int ret, i; |
| 436 | ssize_t ret_len; |
| 437 | |
| 438 | if (lttng_live_should_quit()) { |
| 439 | ret = -1; |
| 440 | goto end; |
| 441 | } |
| 442 | |
| 443 | cmd.cmd = htobe32(LTTNG_VIEWER_ATTACH_SESSION); |
| 444 | cmd.data_size = htobe64((uint64_t) sizeof(rq)); |
| 445 | cmd.cmd_version = htobe32(0); |
| 446 | |
| 447 | memset(&rq, 0, sizeof(rq)); |
| 448 | rq.session_id = htobe64(id); |
| 449 | // TODO: add cmd line parameter to select seek beginning |
| 450 | // rq.seek = htobe32(LTTNG_VIEWER_SEEK_BEGINNING); |
| 451 | rq.seek = htobe32(LTTNG_VIEWER_SEEK_LAST); |
| 452 | |
| 453 | /* |
| 454 | * Merge the cmd and connection request to prevent a write-write |
| 455 | * sequence on the TCP socket. Otherwise, a delayed ACK will prevent the |
| 456 | * second write to be performed quickly in presence of Nagle's algorithm. |
| 457 | */ |
| 458 | memcpy(cmd_buf, &cmd, sizeof(cmd)); |
| 459 | memcpy(cmd_buf + sizeof(cmd), &rq, sizeof(rq)); |
| 460 | |
| 461 | ret_len = lttng_live_send(ctx->control_sock, cmd_buf, cmd_buf_len); |
| 462 | if (ret_len < 0) { |
| 463 | perror("[error] Error sending attach command and request"); |
| 464 | goto error; |
| 465 | } |
| 466 | assert(ret_len == cmd_buf_len); |
| 467 | |
| 468 | ret_len = lttng_live_recv(ctx->control_sock, &rp, sizeof(rp)); |
| 469 | if (ret_len == 0) { |
| 470 | fprintf(stderr, "[error] Remote side has closed connection\n"); |
| 471 | goto error; |
| 472 | } |
| 473 | if (ret_len < 0) { |
| 474 | perror("[error] Error receiving attach response"); |
| 475 | goto error; |
| 476 | } |
| 477 | assert(ret_len == sizeof(rp)); |
| 478 | |
| 479 | switch(be32toh(rp.status)) { |
| 480 | case LTTNG_VIEWER_ATTACH_OK: |
| 481 | break; |
| 482 | case LTTNG_VIEWER_ATTACH_UNK: |
| 483 | ret = -LTTNG_VIEWER_ATTACH_UNK; |
| 484 | goto end; |
| 485 | case LTTNG_VIEWER_ATTACH_ALREADY: |
| 486 | fprintf(stderr, "[error] There is already a viewer attached to this session\n"); |
| 487 | goto error; |
| 488 | case LTTNG_VIEWER_ATTACH_NOT_LIVE: |
| 489 | fprintf(stderr, "[error] Not a live session\n"); |
| 490 | goto error; |
| 491 | case LTTNG_VIEWER_ATTACH_SEEK_ERR: |
| 492 | fprintf(stderr, "[error] Wrong seek parameter\n"); |
| 493 | goto error; |
| 494 | default: |
| 495 | fprintf(stderr, "[error] Unknown attach return code %u\n", |
| 496 | be32toh(rp.status)); |
| 497 | goto error; |
| 498 | } |
| 499 | if (be32toh(rp.status) != LTTNG_VIEWER_ATTACH_OK) { |
| 500 | goto error; |
| 501 | } |
| 502 | |
| 503 | ctx->session->stream_count += be32toh(rp.streams_count); |
| 504 | /* |
| 505 | * When the session is created but not started, we do an active wait |
| 506 | * until it starts. It allows the viewer to start processing the trace |
| 507 | * as soon as the session starts. |
| 508 | */ |
| 509 | if (ctx->session->stream_count == 0) { |
| 510 | ret = 0; |
| 511 | goto end; |
| 512 | } |
| 513 | printf_verbose("Waiting for %d streams:\n", |
| 514 | be32toh(rp.streams_count)); |
| 515 | for (i = 0; i < be32toh(rp.streams_count); i++) { |
| 516 | struct lttng_live_viewer_stream *lvstream; |
| 517 | |
| 518 | lvstream = g_new0(struct lttng_live_viewer_stream, 1); |
| 519 | ret_len = lttng_live_recv(ctx->control_sock, &stream, |
| 520 | sizeof(stream)); |
| 521 | if (ret_len == 0) { |
| 522 | fprintf(stderr, "[error] Remote side has closed connection\n"); |
| 523 | g_free(lvstream); |
| 524 | goto error; |
| 525 | } |
| 526 | if (ret_len < 0) { |
| 527 | perror("[error] Error receiving stream"); |
| 528 | g_free(lvstream); |
| 529 | goto error; |
| 530 | } |
| 531 | assert(ret_len == sizeof(stream)); |
| 532 | stream.path_name[LTTNG_VIEWER_PATH_MAX - 1] = '\0'; |
| 533 | stream.channel_name[LTTNG_VIEWER_NAME_MAX - 1] = '\0'; |
| 534 | |
| 535 | printf_verbose(" stream %" PRIu64 " : %s/%s\n", |
| 536 | be64toh(stream.id), stream.path_name, |
| 537 | stream.channel_name); |
| 538 | lvstream->id = be64toh(stream.id); |
| 539 | lvstream->session = ctx->session; |
| 540 | |
| 541 | lvstream->mmap_size = 0; |
| 542 | lvstream->ctf_stream_id = -1ULL; |
| 543 | |
| 544 | if (be32toh(stream.metadata_flag)) { |
| 545 | lvstream->metadata_flag = 1; |
| 546 | } |
| 547 | ret = lttng_live_ctf_trace_assign(lvstream, |
| 548 | be64toh(stream.ctf_trace_id)); |
| 549 | if (ret < 0) { |
| 550 | g_free(lvstream); |
| 551 | goto error; |
| 552 | } |
| 553 | bt_list_add(&lvstream->session_stream_node, |
| 554 | &ctx->session->stream_list); |
| 555 | } |
| 556 | ret = 0; |
| 557 | end: |
| 558 | return ret; |
| 559 | |
| 560 | error: |
| 561 | return -1; |
| 562 | } |
| 563 | |
| 564 | /* |
| 565 | * Ask the relay for new streams. |
| 566 | * |
| 567 | * Returns the number of new streams received or a negative value on error. |
| 568 | */ |
| 569 | static |
| 570 | int ask_new_streams(struct lttng_live_ctx *ctx) |
| 571 | { |
| 572 | int i, ret = 0, nb_streams = 0; |
| 573 | uint64_t id; |
| 574 | |
| 575 | restart: |
| 576 | for (i = 0; i < ctx->session_ids->len; i++) { |
| 577 | id = g_array_index(ctx->session_ids, uint64_t, i); |
| 578 | ret = lttng_live_get_new_streams(ctx, id); |
| 579 | printf_verbose("Asking for new streams returns %d\n", ret); |
| 580 | if (lttng_live_should_quit()) { |
| 581 | ret = -1; |
| 582 | goto end; |
| 583 | } |
| 584 | if (ret < 0) { |
| 585 | if (ret == -LTTNG_VIEWER_NEW_STREAMS_HUP) { |
| 586 | printf_verbose("Session %" PRIu64 " closed\n", |
| 587 | id); |
| 588 | /* |
| 589 | * The streams have already been closed during |
| 590 | * the reading, so we only need to get rid of |
| 591 | * the trace in our internal table of sessions. |
| 592 | */ |
| 593 | g_array_remove_index(ctx->session_ids, i); |
| 594 | /* |
| 595 | * We can't continue iterating on the g_array |
| 596 | * after a remove, we have to start again. |
| 597 | */ |
| 598 | goto restart; |
| 599 | } else { |
| 600 | ret = -1; |
| 601 | goto end; |
| 602 | } |
| 603 | } else { |
| 604 | nb_streams += ret; |
| 605 | } |
| 606 | } |
| 607 | if (ctx->session_ids->len == 0) { |
| 608 | /* All sessions are closed. */ |
| 609 | ret = -1; |
| 610 | } else { |
| 611 | ret = nb_streams; |
| 612 | } |
| 613 | |
| 614 | end: |
| 615 | return ret; |
| 616 | } |
| 617 | |
| 618 | static |
| 619 | int append_metadata(struct lttng_live_ctx *ctx, |
| 620 | struct lttng_live_viewer_stream *viewer_stream) |
| 621 | { |
| 622 | int ret; |
| 623 | struct lttng_live_viewer_stream *metadata; |
| 624 | char *metadata_buf = NULL; |
| 625 | |
| 626 | if (!viewer_stream->ctf_trace->handle) { |
| 627 | printf_verbose("append_metadata: trace handle not ready yet.\n"); |
| 628 | return 0; |
| 629 | } |
| 630 | |
| 631 | printf_verbose("get_next_index: new metadata needed\n"); |
| 632 | ret = get_new_metadata(ctx, viewer_stream, &metadata_buf); |
| 633 | if (ret < 0) { |
| 634 | free(metadata_buf); |
| 635 | goto error; |
| 636 | } |
| 637 | |
| 638 | metadata = viewer_stream->ctf_trace->metadata_stream; |
| 639 | metadata->ctf_trace->metadata_fp = |
| 640 | babeltrace_fmemopen(metadata_buf, |
| 641 | metadata->metadata_len, "rb"); |
| 642 | if (!metadata->ctf_trace->metadata_fp) { |
| 643 | perror("Metadata fmemopen"); |
| 644 | free(metadata_buf); |
| 645 | ret = -1; |
| 646 | goto error; |
| 647 | } |
| 648 | ret = ctf_append_trace_metadata( |
| 649 | viewer_stream->ctf_trace->handle->td, |
| 650 | metadata->ctf_trace->metadata_fp); |
| 651 | /* We accept empty metadata packets */ |
| 652 | if (ret != 0 && ret != -ENOENT) { |
| 653 | fprintf(stderr, "[error] Appending metadata\n"); |
| 654 | goto error; |
| 655 | } |
| 656 | ret = 0; |
| 657 | |
| 658 | error: |
| 659 | return ret; |
| 660 | } |
| 661 | |
| 662 | static |
| 663 | int get_data_packet(struct lttng_live_ctx *ctx, |
| 664 | struct ctf_stream_pos *pos, |
| 665 | struct lttng_live_viewer_stream *stream, uint64_t offset, |
| 666 | uint64_t len) |
| 667 | { |
| 668 | struct lttng_viewer_cmd cmd; |
| 669 | struct lttng_viewer_get_packet rq; |
| 670 | struct lttng_viewer_trace_packet rp; |
| 671 | const size_t cmd_buf_len = sizeof(cmd) + sizeof(rq); |
| 672 | char cmd_buf[cmd_buf_len]; |
| 673 | ssize_t ret_len; |
| 674 | int ret; |
| 675 | |
| 676 | retry: |
| 677 | if (lttng_live_should_quit()) { |
| 678 | ret = -1; |
| 679 | goto end; |
| 680 | } |
| 681 | |
| 682 | cmd.cmd = htobe32(LTTNG_VIEWER_GET_PACKET); |
| 683 | cmd.data_size = htobe64((uint64_t) sizeof(rq)); |
| 684 | cmd.cmd_version = htobe32(0); |
| 685 | |
| 686 | memset(&rq, 0, sizeof(rq)); |
| 687 | rq.stream_id = htobe64(stream->id); |
| 688 | rq.offset = htobe64(offset); |
| 689 | rq.len = htobe32(len); |
| 690 | |
| 691 | /* |
| 692 | * Merge the cmd and connection request to prevent a write-write |
| 693 | * sequence on the TCP socket. Otherwise, a delayed ACK will prevent the |
| 694 | * second write to be performed quickly in presence of Nagle's algorithm. |
| 695 | */ |
| 696 | memcpy(cmd_buf, &cmd, sizeof(cmd)); |
| 697 | memcpy(cmd_buf + sizeof(cmd), &rq, sizeof(rq)); |
| 698 | |
| 699 | ret_len = lttng_live_send(ctx->control_sock, cmd_buf, cmd_buf_len); |
| 700 | if (ret_len < 0) { |
| 701 | perror("[error] Error sending get_data_packet cmd and request"); |
| 702 | goto error; |
| 703 | } |
| 704 | assert(ret_len == cmd_buf_len); |
| 705 | |
| 706 | ret_len = lttng_live_recv(ctx->control_sock, &rp, sizeof(rp)); |
| 707 | if (ret_len == 0) { |
| 708 | fprintf(stderr, "[error] Remote side has closed connection\n"); |
| 709 | goto error; |
| 710 | } |
| 711 | if (ret_len < 0) { |
| 712 | perror("[error] Error receiving data response"); |
| 713 | goto error; |
| 714 | } |
| 715 | if (ret_len != sizeof(rp)) { |
| 716 | fprintf(stderr, "[error] get_data_packet: expected %zu" |
| 717 | ", received %zd\n", sizeof(rp), |
| 718 | ret_len); |
| 719 | goto error; |
| 720 | } |
| 721 | |
| 722 | rp.flags = be32toh(rp.flags); |
| 723 | |
| 724 | switch (be32toh(rp.status)) { |
| 725 | case LTTNG_VIEWER_GET_PACKET_OK: |
| 726 | len = be32toh(rp.len); |
| 727 | printf_verbose("get_data_packet: Ok, packet size : %" PRIu64 |
| 728 | "\n", len); |
| 729 | break; |
| 730 | case LTTNG_VIEWER_GET_PACKET_RETRY: |
| 731 | /* Unimplemented by relay daemon */ |
| 732 | printf_verbose("get_data_packet: retry\n"); |
| 733 | goto error; |
| 734 | case LTTNG_VIEWER_GET_PACKET_ERR: |
| 735 | if (rp.flags & LTTNG_VIEWER_FLAG_NEW_METADATA) { |
| 736 | printf_verbose("get_data_packet: new metadata needed\n"); |
| 737 | ret = append_metadata(ctx, stream); |
| 738 | if (ret) |
| 739 | goto error; |
| 740 | } |
| 741 | if (rp.flags & LTTNG_VIEWER_FLAG_NEW_STREAM) { |
| 742 | printf_verbose("get_data_packet: new streams needed\n"); |
| 743 | ret = ask_new_streams(ctx); |
| 744 | if (ret < 0) { |
| 745 | goto error; |
| 746 | } else if (ret > 0) { |
| 747 | ret = add_traces(ctx); |
| 748 | if (ret < 0) { |
| 749 | goto error; |
| 750 | } |
| 751 | } |
| 752 | } |
| 753 | if (rp.flags & (LTTNG_VIEWER_FLAG_NEW_METADATA |
| 754 | | LTTNG_VIEWER_FLAG_NEW_STREAM)) { |
| 755 | goto retry; |
| 756 | } |
| 757 | fprintf(stderr, "[error] get_data_packet: error\n"); |
| 758 | goto error; |
| 759 | case LTTNG_VIEWER_GET_PACKET_EOF: |
| 760 | ret = -2; |
| 761 | goto end; |
| 762 | default: |
| 763 | printf_verbose("get_data_packet: unknown\n"); |
| 764 | goto error; |
| 765 | } |
| 766 | |
| 767 | if (len == 0) { |
| 768 | goto error; |
| 769 | } |
| 770 | |
| 771 | if (len > stream->mmap_size) { |
| 772 | uint64_t new_size; |
| 773 | |
| 774 | new_size = max_t(uint64_t, len, stream->mmap_size << 1); |
| 775 | if (pos->base_mma) { |
| 776 | /* unmap old base */ |
| 777 | ret = munmap_align(pos->base_mma); |
| 778 | if (ret) { |
| 779 | perror("[error] Unable to unmap old base"); |
| 780 | goto error; |
| 781 | } |
| 782 | pos->base_mma = NULL; |
| 783 | } |
| 784 | pos->base_mma = mmap_align(new_size, |
| 785 | PROT_READ | PROT_WRITE, |
| 786 | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); |
| 787 | if (pos->base_mma == MAP_FAILED) { |
| 788 | perror("[error] mmap error"); |
| 789 | pos->base_mma = NULL; |
| 790 | goto error; |
| 791 | } |
| 792 | |
| 793 | stream->mmap_size = new_size; |
| 794 | printf_verbose("Expanding stream mmap size to %" PRIu64 " bytes\n", |
| 795 | stream->mmap_size); |
| 796 | } |
| 797 | |
| 798 | ret_len = lttng_live_recv(ctx->control_sock, |
| 799 | mmap_align_addr(pos->base_mma), len); |
| 800 | if (ret_len == 0) { |
| 801 | fprintf(stderr, "[error] Remote side has closed connection\n"); |
| 802 | goto error; |
| 803 | } |
| 804 | if (ret_len < 0) { |
| 805 | perror("[error] Error receiving trace packet"); |
| 806 | goto error; |
| 807 | } |
| 808 | assert(ret_len == len); |
| 809 | ret = 0; |
| 810 | end: |
| 811 | return ret; |
| 812 | |
| 813 | error: |
| 814 | return -1; |
| 815 | } |
| 816 | |
| 817 | static |
| 818 | int get_one_metadata_packet(struct lttng_live_ctx *ctx, |
| 819 | struct lttng_live_viewer_stream *metadata_stream) |
| 820 | { |
| 821 | uint64_t len = 0; |
| 822 | int ret; |
| 823 | struct lttng_viewer_cmd cmd; |
| 824 | struct lttng_viewer_get_metadata rq; |
| 825 | struct lttng_viewer_metadata_packet rp; |
| 826 | char *data = NULL; |
| 827 | ssize_t ret_len; |
| 828 | const size_t cmd_buf_len = sizeof(cmd) + sizeof(rq); |
| 829 | char cmd_buf[cmd_buf_len]; |
| 830 | |
| 831 | if (lttng_live_should_quit()) { |
| 832 | ret = -1; |
| 833 | goto end; |
| 834 | } |
| 835 | |
| 836 | rq.stream_id = htobe64(metadata_stream->id); |
| 837 | cmd.cmd = htobe32(LTTNG_VIEWER_GET_METADATA); |
| 838 | cmd.data_size = htobe64((uint64_t) sizeof(rq)); |
| 839 | cmd.cmd_version = htobe32(0); |
| 840 | |
| 841 | /* |
| 842 | * Merge the cmd and connection request to prevent a write-write |
| 843 | * sequence on the TCP socket. Otherwise, a delayed ACK will prevent the |
| 844 | * second write to be performed quickly in presence of Nagle's algorithm. |
| 845 | */ |
| 846 | memcpy(cmd_buf, &cmd, sizeof(cmd)); |
| 847 | memcpy(cmd_buf + sizeof(cmd), &rq, sizeof(rq)); |
| 848 | |
| 849 | printf_verbose("get_metadata for trace_id: %d, ctf_trace_id: %" PRIu64 "\n", |
| 850 | metadata_stream->ctf_trace->trace_id, |
| 851 | metadata_stream->ctf_trace->ctf_trace_id); |
| 852 | ret_len = lttng_live_send(ctx->control_sock, cmd_buf, cmd_buf_len); |
| 853 | if (ret_len < 0) { |
| 854 | perror("[error] Error sending get_metadata cmd and request"); |
| 855 | goto error; |
| 856 | } |
| 857 | assert(ret_len == cmd_buf_len); |
| 858 | |
| 859 | ret_len = lttng_live_recv(ctx->control_sock, &rp, sizeof(rp)); |
| 860 | if (ret_len == 0) { |
| 861 | fprintf(stderr, "[error] Remote side has closed connection\n"); |
| 862 | goto error; |
| 863 | } |
| 864 | if (ret_len < 0) { |
| 865 | perror("[error] Error receiving metadata response"); |
| 866 | goto error; |
| 867 | } |
| 868 | assert(ret_len == sizeof(rp)); |
| 869 | |
| 870 | switch (be32toh(rp.status)) { |
| 871 | case LTTNG_VIEWER_METADATA_OK: |
| 872 | printf_verbose("get_metadata : OK\n"); |
| 873 | break; |
| 874 | case LTTNG_VIEWER_NO_NEW_METADATA: |
| 875 | printf_verbose("get_metadata : NO NEW\n"); |
| 876 | ret = 0; |
| 877 | goto end; |
| 878 | case LTTNG_VIEWER_METADATA_ERR: |
| 879 | printf_verbose("get_metadata : ERR\n"); |
| 880 | goto error; |
| 881 | default: |
| 882 | printf_verbose("get_metadata : UNKNOWN\n"); |
| 883 | goto error; |
| 884 | } |
| 885 | |
| 886 | len = be64toh(rp.len); |
| 887 | printf_verbose("Writing %" PRIu64" bytes to metadata\n", len); |
| 888 | if (len <= 0) { |
| 889 | goto error; |
| 890 | } |
| 891 | |
| 892 | data = zmalloc(len); |
| 893 | if (!data) { |
| 894 | perror("relay data zmalloc"); |
| 895 | goto error; |
| 896 | } |
| 897 | ret_len = lttng_live_recv(ctx->control_sock, data, len); |
| 898 | if (ret_len == 0) { |
| 899 | fprintf(stderr, "[error] Remote side has closed connection\n"); |
| 900 | goto error_free_data; |
| 901 | } |
| 902 | if (ret_len < 0) { |
| 903 | perror("[error] Error receiving trace packet"); |
| 904 | goto error_free_data; |
| 905 | } |
| 906 | assert(ret_len == len); |
| 907 | |
| 908 | do { |
| 909 | ret_len = fwrite(data, 1, len, |
| 910 | metadata_stream->metadata_fp_write); |
| 911 | } while (ret_len < 0 && errno == EINTR); |
| 912 | if (ret_len < 0) { |
| 913 | fprintf(stderr, "[error] Writing in the metadata fp\n"); |
| 914 | goto error_free_data; |
| 915 | } |
| 916 | assert(ret_len == len); |
| 917 | metadata_stream->metadata_len += len; |
| 918 | free(data); |
| 919 | ret = len; |
| 920 | end: |
| 921 | return ret; |
| 922 | |
| 923 | error_free_data: |
| 924 | free(data); |
| 925 | error: |
| 926 | return -1; |
| 927 | } |
| 928 | |
| 929 | /* |
| 930 | * Return 0 on success, a negative value on error. |
| 931 | */ |
| 932 | static |
| 933 | int get_new_metadata(struct lttng_live_ctx *ctx, |
| 934 | struct lttng_live_viewer_stream *viewer_stream, |
| 935 | char **metadata_buf) |
| 936 | { |
| 937 | int ret = 0; |
| 938 | struct lttng_live_viewer_stream *metadata_stream; |
| 939 | size_t size, len_read = 0; |
| 940 | |
| 941 | metadata_stream = viewer_stream->ctf_trace->metadata_stream; |
| 942 | if (!metadata_stream) { |
| 943 | fprintf(stderr, "[error] No metadata stream\n"); |
| 944 | ret = -1; |
| 945 | goto error; |
| 946 | } |
| 947 | metadata_stream->metadata_len = 0; |
| 948 | ret = open_metadata_fp_write(metadata_stream, metadata_buf, &size); |
| 949 | if (ret < 0) { |
| 950 | goto error; |
| 951 | } |
| 952 | |
| 953 | do { |
| 954 | if (lttng_live_should_quit()) { |
| 955 | ret = -1; |
| 956 | goto error; |
| 957 | } |
| 958 | /* |
| 959 | * get_one_metadata_packet returns the number of bytes |
| 960 | * received, 0 when we have received everything, a |
| 961 | * negative value on error. |
| 962 | */ |
| 963 | ret = get_one_metadata_packet(ctx, metadata_stream); |
| 964 | if (ret > 0) { |
| 965 | len_read += ret; |
| 966 | } |
| 967 | if (!len_read) { |
| 968 | (void) poll(NULL, 0, ACTIVE_POLL_DELAY); |
| 969 | } |
| 970 | if (ret < 0) { |
| 971 | break; /* Stop on error. */ |
| 972 | } |
| 973 | } while (ret > 0 || !len_read); |
| 974 | |
| 975 | if (babeltrace_close_memstream(metadata_buf, &size, |
| 976 | metadata_stream->metadata_fp_write)) { |
| 977 | perror("babeltrace_close_memstream"); |
| 978 | } |
| 979 | metadata_stream->metadata_fp_write = NULL; |
| 980 | |
| 981 | error: |
| 982 | return ret; |
| 983 | } |
| 984 | |
| 985 | /* |
| 986 | * Assign the fields from a lttng_viewer_index to a packet_index. |
| 987 | */ |
| 988 | static |
| 989 | void lttng_index_to_packet_index(struct lttng_viewer_index *lindex, |
| 990 | struct packet_index *pindex) |
| 991 | { |
| 992 | assert(lindex); |
| 993 | assert(pindex); |
| 994 | |
| 995 | pindex->offset = be64toh(lindex->offset); |
| 996 | pindex->packet_size = be64toh(lindex->packet_size); |
| 997 | pindex->content_size = be64toh(lindex->content_size); |
| 998 | pindex->ts_cycles.timestamp_begin = be64toh(lindex->timestamp_begin); |
| 999 | pindex->ts_cycles.timestamp_end = be64toh(lindex->timestamp_end); |
| 1000 | pindex->events_discarded = be64toh(lindex->events_discarded); |
| 1001 | } |
| 1002 | |
| 1003 | /* |
| 1004 | * Get one index for a stream. |
| 1005 | * |
| 1006 | * Returns 0 on success or a negative value on error. |
| 1007 | */ |
| 1008 | static |
| 1009 | int get_next_index(struct lttng_live_ctx *ctx, |
| 1010 | struct lttng_live_viewer_stream *viewer_stream, |
| 1011 | struct packet_index *index, uint64_t *stream_id) |
| 1012 | { |
| 1013 | struct lttng_viewer_cmd cmd; |
| 1014 | struct lttng_viewer_get_next_index rq; |
| 1015 | int ret; |
| 1016 | ssize_t ret_len; |
| 1017 | struct lttng_viewer_index *rp = &viewer_stream->current_index; |
| 1018 | const size_t cmd_buf_len = sizeof(cmd) + sizeof(rq); |
| 1019 | char cmd_buf[cmd_buf_len]; |
| 1020 | |
| 1021 | cmd.cmd = htobe32(LTTNG_VIEWER_GET_NEXT_INDEX); |
| 1022 | cmd.data_size = htobe64((uint64_t) sizeof(rq)); |
| 1023 | cmd.cmd_version = htobe32(0); |
| 1024 | |
| 1025 | memset(&rq, 0, sizeof(rq)); |
| 1026 | rq.stream_id = htobe64(viewer_stream->id); |
| 1027 | |
| 1028 | /* |
| 1029 | * Merge the cmd and connection request to prevent a write-write |
| 1030 | * sequence on the TCP socket. Otherwise, a delayed ACK will prevent the |
| 1031 | * second write to be performed quickly in presence of Nagle's algorithm. |
| 1032 | */ |
| 1033 | memcpy(cmd_buf, &cmd, sizeof(cmd)); |
| 1034 | memcpy(cmd_buf + sizeof(cmd), &rq, sizeof(rq)); |
| 1035 | retry: |
| 1036 | if (lttng_live_should_quit()) { |
| 1037 | ret = -1; |
| 1038 | goto end; |
| 1039 | } |
| 1040 | ret_len = lttng_live_send(ctx->control_sock, &cmd_buf, cmd_buf_len); |
| 1041 | if (ret_len < 0) { |
| 1042 | perror("[error] Error sending get_next_index cmd and request"); |
| 1043 | goto error; |
| 1044 | } |
| 1045 | assert(ret_len == cmd_buf_len); |
| 1046 | |
| 1047 | ret_len = lttng_live_recv(ctx->control_sock, rp, sizeof(*rp)); |
| 1048 | if (ret_len == 0) { |
| 1049 | fprintf(stderr, "[error] Remote side has closed connection\n"); |
| 1050 | goto error; |
| 1051 | } |
| 1052 | if (ret_len < 0) { |
| 1053 | perror("[error] Error receiving index response"); |
| 1054 | goto error; |
| 1055 | } |
| 1056 | assert(ret_len == sizeof(*rp)); |
| 1057 | |
| 1058 | rp->flags = be32toh(rp->flags); |
| 1059 | |
| 1060 | switch (be32toh(rp->status)) { |
| 1061 | case LTTNG_VIEWER_INDEX_INACTIVE: |
| 1062 | printf_verbose("get_next_index: inactive\n"); |
| 1063 | |
| 1064 | if (index->ts_cycles.timestamp_end == |
| 1065 | be64toh(rp->timestamp_end)) { |
| 1066 | /* Already seen this timestamp. */ |
| 1067 | (void) poll(NULL, 0, ACTIVE_POLL_DELAY); |
| 1068 | } |
| 1069 | |
| 1070 | memset(index, 0, sizeof(struct packet_index)); |
| 1071 | index->ts_cycles.timestamp_end = be64toh(rp->timestamp_end); |
| 1072 | *stream_id = be64toh(rp->stream_id); |
| 1073 | break; |
| 1074 | case LTTNG_VIEWER_INDEX_OK: |
| 1075 | printf_verbose("get_next_index: Ok, need metadata update : %u\n", |
| 1076 | rp->flags & LTTNG_VIEWER_FLAG_NEW_METADATA); |
| 1077 | lttng_index_to_packet_index(rp, index); |
| 1078 | *stream_id = be64toh(rp->stream_id); |
| 1079 | viewer_stream->data_pending = 1; |
| 1080 | |
| 1081 | if (rp->flags & LTTNG_VIEWER_FLAG_NEW_METADATA) { |
| 1082 | ret = append_metadata(ctx, viewer_stream); |
| 1083 | if (ret) |
| 1084 | goto error; |
| 1085 | } |
| 1086 | if (rp->flags & LTTNG_VIEWER_FLAG_NEW_STREAM) { |
| 1087 | printf_verbose("get_next_index: need new streams\n"); |
| 1088 | ret = ask_new_streams(ctx); |
| 1089 | if (ret < 0) { |
| 1090 | goto error; |
| 1091 | } else if (ret > 0) { |
| 1092 | ret = add_traces(ctx); |
| 1093 | if (ret < 0) { |
| 1094 | goto error; |
| 1095 | } |
| 1096 | } |
| 1097 | } |
| 1098 | break; |
| 1099 | case LTTNG_VIEWER_INDEX_RETRY: |
| 1100 | printf_verbose("get_next_index: retry\n"); |
| 1101 | (void) poll(NULL, 0, ACTIVE_POLL_DELAY); |
| 1102 | goto retry; |
| 1103 | case LTTNG_VIEWER_INDEX_HUP: |
| 1104 | printf_verbose("get_next_index: stream hung up\n"); |
| 1105 | viewer_stream->id = -1ULL; |
| 1106 | index->offset = EOF; |
| 1107 | ctx->session->stream_count--; |
| 1108 | viewer_stream->in_trace = 0; |
| 1109 | bt_list_del(&viewer_stream->trace_stream_node); |
| 1110 | bt_list_del(&viewer_stream->session_stream_node); |
| 1111 | *stream_id = be64toh(rp->stream_id); |
| 1112 | g_free(viewer_stream); |
| 1113 | break; |
| 1114 | case LTTNG_VIEWER_INDEX_ERR: |
| 1115 | fprintf(stderr, "[error] get_next_index: error\n"); |
| 1116 | goto error; |
| 1117 | default: |
| 1118 | fprintf(stderr, "[error] get_next_index: unkwown value\n"); |
| 1119 | goto error; |
| 1120 | } |
| 1121 | ret = 0; |
| 1122 | end: |
| 1123 | return ret; |
| 1124 | |
| 1125 | error: |
| 1126 | return -1; |
| 1127 | } |
| 1128 | |
| 1129 | static |
| 1130 | void read_packet_header(struct ctf_stream_pos *pos, |
| 1131 | struct ctf_file_stream *file_stream) |
| 1132 | { |
| 1133 | int ret; |
| 1134 | |
| 1135 | /* update trace_packet_header and stream_packet_context */ |
| 1136 | if (!(pos->prot & PROT_WRITE) && |
| 1137 | file_stream->parent.trace_packet_header) { |
| 1138 | /* Read packet header */ |
| 1139 | ret = generic_rw(&pos->parent, |
| 1140 | &file_stream->parent.trace_packet_header->p); |
| 1141 | if (ret) { |
| 1142 | pos->offset = EOF; |
| 1143 | fprintf(stderr, "[error] trace packet " |
| 1144 | "header read failed\n"); |
| 1145 | goto end; |
| 1146 | } |
| 1147 | } |
| 1148 | if (!(pos->prot & PROT_WRITE) && |
| 1149 | file_stream->parent.stream_packet_context) { |
| 1150 | /* Read packet context */ |
| 1151 | ret = generic_rw(&pos->parent, |
| 1152 | &file_stream->parent.stream_packet_context->p); |
| 1153 | if (ret) { |
| 1154 | pos->offset = EOF; |
| 1155 | fprintf(stderr, "[error] stream packet " |
| 1156 | "context read failed\n"); |
| 1157 | goto end; |
| 1158 | } |
| 1159 | } |
| 1160 | pos->data_offset = pos->offset; |
| 1161 | |
| 1162 | end: |
| 1163 | return; |
| 1164 | } |
| 1165 | |
| 1166 | /* |
| 1167 | * Handle the seek parameters. |
| 1168 | * Returns 0 if the packet_seek can continue, a positive value to |
| 1169 | * cleanly exit the packet_seek, a negative value on error. |
| 1170 | */ |
| 1171 | static |
| 1172 | int handle_seek_position(size_t index, int whence, |
| 1173 | struct lttng_live_viewer_stream *viewer_stream, |
| 1174 | struct ctf_stream_pos *pos, |
| 1175 | struct ctf_file_stream *file_stream) |
| 1176 | { |
| 1177 | int ret = 0; |
| 1178 | |
| 1179 | switch (whence) { |
| 1180 | case SEEK_CUR: |
| 1181 | ret = 0; |
| 1182 | goto end; |
| 1183 | case SEEK_SET: |
| 1184 | /* |
| 1185 | * We only allow to seek to 0. |
| 1186 | */ |
| 1187 | if (index != 0) { |
| 1188 | fprintf(stderr, "[error] Arbitrary seek in lttng-live " |
| 1189 | "trace not supported\n"); |
| 1190 | pos->offset = EOF; |
| 1191 | ret = -1; |
| 1192 | goto end; |
| 1193 | } |
| 1194 | |
| 1195 | ret = 0; |
| 1196 | goto end; |
| 1197 | |
| 1198 | default: |
| 1199 | fprintf(stderr, "[error] Invalid seek parameter\n"); |
| 1200 | assert(0); |
| 1201 | } |
| 1202 | |
| 1203 | end: |
| 1204 | return ret; |
| 1205 | } |
| 1206 | |
| 1207 | static |
| 1208 | void ctf_live_packet_seek(struct bt_stream_pos *stream_pos, size_t index, |
| 1209 | int whence) |
| 1210 | { |
| 1211 | struct ctf_stream_pos *pos; |
| 1212 | struct ctf_file_stream *file_stream; |
| 1213 | struct packet_index *prev_index = NULL, *cur_index; |
| 1214 | struct lttng_live_viewer_stream *viewer_stream; |
| 1215 | struct lttng_live_session *session; |
| 1216 | uint64_t stream_id = -1ULL; |
| 1217 | int ret; |
| 1218 | |
| 1219 | pos = ctf_pos(stream_pos); |
| 1220 | file_stream = container_of(pos, struct ctf_file_stream, pos); |
| 1221 | viewer_stream = (struct lttng_live_viewer_stream *) pos->priv; |
| 1222 | session = viewer_stream->session; |
| 1223 | |
| 1224 | ret = handle_seek_position(index, whence, viewer_stream, pos, |
| 1225 | file_stream); |
| 1226 | if (ret != 0) { |
| 1227 | ret = -BT_PACKET_SEEK_ERROR; |
| 1228 | goto end; |
| 1229 | } |
| 1230 | |
| 1231 | retry: |
| 1232 | switch (pos->packet_index->len) { |
| 1233 | case 0: |
| 1234 | g_array_set_size(pos->packet_index, 1); |
| 1235 | cur_index = &g_array_index(pos->packet_index, |
| 1236 | struct packet_index, 0); |
| 1237 | break; |
| 1238 | case 1: |
| 1239 | g_array_set_size(pos->packet_index, 2); |
| 1240 | prev_index = &g_array_index(pos->packet_index, |
| 1241 | struct packet_index, 0); |
| 1242 | cur_index = &g_array_index(pos->packet_index, |
| 1243 | struct packet_index, 1); |
| 1244 | break; |
| 1245 | case 2: |
| 1246 | g_array_index(pos->packet_index, |
| 1247 | struct packet_index, 0) = |
| 1248 | g_array_index(pos->packet_index, |
| 1249 | struct packet_index, 1); |
| 1250 | prev_index = &g_array_index(pos->packet_index, |
| 1251 | struct packet_index, 0); |
| 1252 | cur_index = &g_array_index(pos->packet_index, |
| 1253 | struct packet_index, 1); |
| 1254 | break; |
| 1255 | default: |
| 1256 | abort(); |
| 1257 | break; |
| 1258 | } |
| 1259 | |
| 1260 | if (viewer_stream->data_pending) { |
| 1261 | lttng_index_to_packet_index(&viewer_stream->current_index, cur_index); |
| 1262 | } else { |
| 1263 | printf_verbose("get_next_index for stream %" PRIu64 "\n", viewer_stream->id); |
| 1264 | ret = get_next_index(session->ctx, viewer_stream, cur_index, &stream_id); |
| 1265 | if (ret < 0) { |
| 1266 | pos->offset = EOF; |
| 1267 | if (!lttng_live_should_quit()) { |
| 1268 | fprintf(stderr, "[error] get_next_index failed\n"); |
| 1269 | } |
| 1270 | ret = -BT_PACKET_SEEK_ERROR; |
| 1271 | goto end; |
| 1272 | } |
| 1273 | printf_verbose("Index received : packet_size : %" PRIu64 |
| 1274 | ", offset %" PRIu64 ", content_size %" PRIu64 |
| 1275 | ", timestamp_end : %" PRIu64 "\n", |
| 1276 | cur_index->packet_size, cur_index->offset, |
| 1277 | cur_index->content_size, |
| 1278 | cur_index->ts_cycles.timestamp_end); |
| 1279 | |
| 1280 | } |
| 1281 | |
| 1282 | /* |
| 1283 | * On the first time we receive an index, the stream_id needs to |
| 1284 | * be set for the stream in order to use it, we don't want any |
| 1285 | * data at this stage. |
| 1286 | */ |
| 1287 | if (file_stream->parent.stream_id == -1ULL) { |
| 1288 | /* |
| 1289 | * Warning: with lttng-tools < 2.4.2, the beacon does not |
| 1290 | * contain the real stream ID, it is memset to 0, so this |
| 1291 | * might create a problem when a session has multiple |
| 1292 | * channels. We can't detect it at this stage, lttng-tools |
| 1293 | * has to be upgraded to fix this problem. |
| 1294 | */ |
| 1295 | printf_verbose("Assigning stream_id %" PRIu64 "\n", |
| 1296 | stream_id); |
| 1297 | file_stream->parent.stream_id = stream_id; |
| 1298 | viewer_stream->ctf_stream_id = stream_id; |
| 1299 | |
| 1300 | ret = 0; |
| 1301 | goto end; |
| 1302 | } |
| 1303 | |
| 1304 | pos->packet_size = cur_index->packet_size; |
| 1305 | pos->content_size = cur_index->content_size; |
| 1306 | pos->mmap_base_offset = 0; |
| 1307 | if (cur_index->offset == EOF) { |
| 1308 | pos->offset = EOF; |
| 1309 | } else { |
| 1310 | pos->offset = 0; |
| 1311 | } |
| 1312 | |
| 1313 | if (cur_index->content_size == 0) { |
| 1314 | /* Beacon packet index */ |
| 1315 | if (file_stream->parent.stream_class) { |
| 1316 | file_stream->parent.cycles_timestamp = |
| 1317 | cur_index->ts_cycles.timestamp_end; |
| 1318 | file_stream->parent.real_timestamp = ctf_get_real_timestamp( |
| 1319 | &file_stream->parent, |
| 1320 | cur_index->ts_cycles.timestamp_end); |
| 1321 | |
| 1322 | /* |
| 1323 | * Duplicate the data from the previous index, because |
| 1324 | * the one we just received is only a beacon with no |
| 1325 | * relevant information except the timestamp_end. We |
| 1326 | * don't need to keep this timestamp_end because we already |
| 1327 | * updated the file_stream timestamps, so we only need |
| 1328 | * to keep the last real index data as prev_index. That |
| 1329 | * way, we keep the original prev timestamps and |
| 1330 | * discarded events counter. This is the same behaviour |
| 1331 | * as if we were reading a local trace, we would not |
| 1332 | * have fake indexes between real indexes. |
| 1333 | */ |
| 1334 | memcpy(cur_index, prev_index, sizeof(struct packet_index)); |
| 1335 | } |
| 1336 | } else { |
| 1337 | /* Real packet index */ |
| 1338 | if (file_stream->parent.stream_class) { |
| 1339 | /* Convert the timestamps and append to the real_index. */ |
| 1340 | cur_index->ts_real.timestamp_begin = ctf_get_real_timestamp( |
| 1341 | &file_stream->parent, |
| 1342 | cur_index->ts_cycles.timestamp_begin); |
| 1343 | cur_index->ts_real.timestamp_end = ctf_get_real_timestamp( |
| 1344 | &file_stream->parent, |
| 1345 | cur_index->ts_cycles.timestamp_end); |
| 1346 | } |
| 1347 | |
| 1348 | ctf_update_current_packet_index(&file_stream->parent, |
| 1349 | prev_index, cur_index); |
| 1350 | |
| 1351 | /* |
| 1352 | * We need to check if we are in trace read or called |
| 1353 | * from packet indexing. In this last case, the |
| 1354 | * collection is not there, so we cannot print the |
| 1355 | * timestamps. |
| 1356 | */ |
| 1357 | if ((&file_stream->parent)->stream_class->trace->parent.collection) { |
| 1358 | ctf_print_discarded_lost(stderr, &file_stream->parent); |
| 1359 | } |
| 1360 | |
| 1361 | file_stream->parent.cycles_timestamp = |
| 1362 | cur_index->ts_cycles.timestamp_begin; |
| 1363 | file_stream->parent.real_timestamp = |
| 1364 | cur_index->ts_real.timestamp_begin; |
| 1365 | } |
| 1366 | |
| 1367 | /* |
| 1368 | * Flush the output between attempts to grab a packet, thus |
| 1369 | * ensuring we flush at least at the periodical timer period. |
| 1370 | * This ensures the output remains reactive for interactive users and |
| 1371 | * that the output is flushed when redirected to a file by the shell. |
| 1372 | */ |
| 1373 | if (fflush(LTTNG_LIVE_OUTPUT_FP) < 0) { |
| 1374 | perror("fflush"); |
| 1375 | goto end; |
| 1376 | } |
| 1377 | |
| 1378 | if (pos->packet_size == 0 || pos->offset == EOF) { |
| 1379 | goto end; |
| 1380 | } |
| 1381 | |
| 1382 | printf_verbose("get_data_packet for stream %" PRIu64 "\n", |
| 1383 | viewer_stream->id); |
| 1384 | ret = get_data_packet(session->ctx, pos, viewer_stream, |
| 1385 | cur_index->offset, |
| 1386 | cur_index->packet_size / CHAR_BIT); |
| 1387 | if (ret == -2) { |
| 1388 | goto retry; |
| 1389 | } else if (ret < 0) { |
| 1390 | pos->offset = EOF; |
| 1391 | if (!lttng_live_should_quit()) { |
| 1392 | fprintf(stderr, "[error] get_data_packet failed\n"); |
| 1393 | ret = -BT_PACKET_SEEK_ERROR; |
| 1394 | } else { |
| 1395 | ret = 0; |
| 1396 | } |
| 1397 | goto end; |
| 1398 | } |
| 1399 | viewer_stream->data_pending = 0; |
| 1400 | |
| 1401 | read_packet_header(pos, file_stream); |
| 1402 | ret = 0; |
| 1403 | end: |
| 1404 | bt_packet_seek_set_error(ret); |
| 1405 | } |
| 1406 | |
| 1407 | int lttng_live_create_viewer_session(struct lttng_live_ctx *ctx) |
| 1408 | { |
| 1409 | struct lttng_viewer_cmd cmd; |
| 1410 | struct lttng_viewer_create_session_response resp; |
| 1411 | int ret; |
| 1412 | ssize_t ret_len; |
| 1413 | |
| 1414 | if (lttng_live_should_quit()) { |
| 1415 | ret = -1; |
| 1416 | goto end; |
| 1417 | } |
| 1418 | |
| 1419 | cmd.cmd = htobe32(LTTNG_VIEWER_CREATE_SESSION); |
| 1420 | cmd.data_size = htobe64((uint64_t) 0); |
| 1421 | cmd.cmd_version = htobe32(0); |
| 1422 | |
| 1423 | ret_len = lttng_live_send(ctx->control_sock, &cmd, sizeof(cmd)); |
| 1424 | if (ret_len < 0) { |
| 1425 | perror("[error] Error sending cmd"); |
| 1426 | goto error; |
| 1427 | } |
| 1428 | assert(ret_len == sizeof(cmd)); |
| 1429 | |
| 1430 | ret_len = lttng_live_recv(ctx->control_sock, &resp, sizeof(resp)); |
| 1431 | if (ret_len == 0) { |
| 1432 | fprintf(stderr, "[error] Remote side has closed connection\n"); |
| 1433 | goto error; |
| 1434 | } |
| 1435 | if (ret_len < 0) { |
| 1436 | perror("[error] Error receiving create session reply"); |
| 1437 | goto error; |
| 1438 | } |
| 1439 | assert(ret_len == sizeof(resp)); |
| 1440 | |
| 1441 | if (be32toh(resp.status) != LTTNG_VIEWER_CREATE_SESSION_OK) { |
| 1442 | fprintf(stderr, "[error] Error creating viewer session\n"); |
| 1443 | goto error; |
| 1444 | } |
| 1445 | ret = 0; |
| 1446 | end: |
| 1447 | return ret; |
| 1448 | |
| 1449 | error: |
| 1450 | return -1; |
| 1451 | } |
| 1452 | |
| 1453 | static |
| 1454 | int del_traces(gpointer key, gpointer value, gpointer user_data) |
| 1455 | { |
| 1456 | struct bt_context *bt_ctx = user_data; |
| 1457 | struct lttng_live_ctf_trace *trace = value; |
| 1458 | int ret; |
| 1459 | struct lttng_live_viewer_stream *lvstream, *tmp; |
| 1460 | |
| 1461 | /* |
| 1462 | * We don't have ownership of the live viewer stream, just |
| 1463 | * remove them from our list. |
| 1464 | */ |
| 1465 | bt_list_for_each_entry_safe(lvstream, tmp, &trace->stream_list, |
| 1466 | trace_stream_node) { |
| 1467 | lvstream->in_trace = 0; |
| 1468 | bt_list_del(&lvstream->trace_stream_node); |
| 1469 | } |
| 1470 | if (trace->in_use && trace->trace_id >= 0) { |
| 1471 | ret = bt_context_remove_trace(bt_ctx, trace->trace_id); |
| 1472 | if (ret < 0) |
| 1473 | fprintf(stderr, "[error] removing trace from context\n"); |
| 1474 | } |
| 1475 | |
| 1476 | /* remove the key/value pair from the HT. */ |
| 1477 | return 1; |
| 1478 | } |
| 1479 | |
| 1480 | static |
| 1481 | int add_one_trace(struct lttng_live_ctx *ctx, |
| 1482 | struct lttng_live_ctf_trace *trace) |
| 1483 | { |
| 1484 | int ret; |
| 1485 | struct bt_context *bt_ctx = ctx->bt_ctx; |
| 1486 | struct lttng_live_viewer_stream *stream; |
| 1487 | struct bt_mmap_stream *new_mmap_stream; |
| 1488 | struct bt_mmap_stream_list mmap_list; |
| 1489 | struct bt_trace_descriptor *td; |
| 1490 | struct bt_trace_handle *handle; |
| 1491 | |
| 1492 | printf_verbose("Add one trace ctf_trace_id: %" PRIu64 |
| 1493 | " (metadata_stream: %p)\n", |
| 1494 | trace->ctf_trace_id, trace->metadata_stream); |
| 1495 | /* |
| 1496 | * We don't know how many streams we will receive for a trace, so |
| 1497 | * once we are done receiving the traces, we add all the traces |
| 1498 | * received to the bt_context. |
| 1499 | * We can receive streams during the attach command or the |
| 1500 | * get_new_streams, so we have to make sure not to add multiple |
| 1501 | * times the same traces. |
| 1502 | * If a trace is already in the context, we just skip this function. |
| 1503 | */ |
| 1504 | if (trace->in_use) { |
| 1505 | printf_verbose("Trace already in use\n"); |
| 1506 | ret = 0; |
| 1507 | goto end; |
| 1508 | } |
| 1509 | /* |
| 1510 | * add_one_trace can be called recursively if during the |
| 1511 | * bt_context_add_trace call we need to fetch new streams, so we need to |
| 1512 | * prevent a recursive call to process our current trace. |
| 1513 | */ |
| 1514 | trace->in_use = 1; |
| 1515 | |
| 1516 | BT_INIT_LIST_HEAD(&mmap_list.head); |
| 1517 | |
| 1518 | bt_list_for_each_entry(stream, &trace->stream_list, trace_stream_node) { |
| 1519 | if (!stream->metadata_flag) { |
| 1520 | new_mmap_stream = zmalloc(sizeof(struct bt_mmap_stream)); |
| 1521 | new_mmap_stream->priv = (void *) stream; |
| 1522 | new_mmap_stream->fd = -1; |
| 1523 | bt_list_add(&new_mmap_stream->list, &mmap_list.head); |
| 1524 | } else { |
| 1525 | char *metadata_buf = NULL; |
| 1526 | |
| 1527 | /* Get all possible metadata before starting */ |
| 1528 | ret = get_new_metadata(ctx, stream, &metadata_buf); |
| 1529 | if (ret) { |
| 1530 | free(metadata_buf); |
| 1531 | goto end_free; |
| 1532 | } |
| 1533 | if (!stream->metadata_len) { |
| 1534 | fprintf(stderr, "[error] empty metadata\n"); |
| 1535 | ret = -1; |
| 1536 | free(metadata_buf); |
| 1537 | goto end_free; |
| 1538 | } |
| 1539 | |
| 1540 | printf_verbose("Metadata stream found\n"); |
| 1541 | trace->metadata_fp = babeltrace_fmemopen(metadata_buf, |
| 1542 | stream->metadata_len, "rb"); |
| 1543 | if (!trace->metadata_fp) { |
| 1544 | perror("Metadata fmemopen"); |
| 1545 | ret = -1; |
| 1546 | free(metadata_buf); |
| 1547 | goto end_free; |
| 1548 | } |
| 1549 | } |
| 1550 | } |
| 1551 | |
| 1552 | if (!trace->metadata_fp) { |
| 1553 | fprintf(stderr, "[error] No metadata stream opened\n"); |
| 1554 | ret = -1; |
| 1555 | goto end_free; |
| 1556 | } |
| 1557 | |
| 1558 | ret = bt_context_add_trace(bt_ctx, NULL, "ctf", |
| 1559 | ctf_live_packet_seek, &mmap_list, trace->metadata_fp); |
| 1560 | if (ret < 0) { |
| 1561 | fprintf(stderr, "[error] Error adding trace\n"); |
| 1562 | ret = -1; |
| 1563 | goto end_free; |
| 1564 | } |
| 1565 | trace->metadata_stream->metadata_len = 0; |
| 1566 | |
| 1567 | handle = (struct bt_trace_handle *) g_hash_table_lookup( |
| 1568 | bt_ctx->trace_handles, |
| 1569 | (gpointer) (unsigned long) ret); |
| 1570 | td = handle->td; |
| 1571 | trace->handle = handle; |
| 1572 | if (bt_ctx->current_iterator) { |
| 1573 | bt_iter_add_trace(bt_ctx->current_iterator, td); |
| 1574 | } |
| 1575 | |
| 1576 | trace->trace_id = ret; |
| 1577 | printf_verbose("Trace now in use, id = %d\n", trace->trace_id); |
| 1578 | |
| 1579 | goto end; |
| 1580 | |
| 1581 | end_free: |
| 1582 | bt_context_put(bt_ctx); |
| 1583 | end: |
| 1584 | return ret; |
| 1585 | } |
| 1586 | |
| 1587 | /* |
| 1588 | * Make sure all the traces we know have a metadata stream or loop on |
| 1589 | * ask_new_streams until it is done. This must be called before we call |
| 1590 | * add_one_trace. |
| 1591 | * |
| 1592 | * Return 0 when all known traces have a metadata stream, a negative value |
| 1593 | * on error. |
| 1594 | */ |
| 1595 | static |
| 1596 | int check_traces_metadata(struct lttng_live_ctx *ctx) |
| 1597 | { |
| 1598 | int ret; |
| 1599 | struct lttng_live_ctf_trace *trace; |
| 1600 | GHashTableIter it; |
| 1601 | gpointer key; |
| 1602 | gpointer value; |
| 1603 | |
| 1604 | retry: |
| 1605 | g_hash_table_iter_init(&it, ctx->session->ctf_traces); |
| 1606 | while (g_hash_table_iter_next(&it, &key, &value)) { |
| 1607 | trace = (struct lttng_live_ctf_trace *) value; |
| 1608 | printf_verbose("Check trace %" PRIu64 " metadata\n", trace->ctf_trace_id); |
| 1609 | while (!trace->metadata_stream) { |
| 1610 | printf_verbose("Waiting for metadata stream\n"); |
| 1611 | if (lttng_live_should_quit()) { |
| 1612 | ret = 0; |
| 1613 | goto end; |
| 1614 | } |
| 1615 | ret = ask_new_streams(ctx); |
| 1616 | if (ret < 0) { |
| 1617 | goto end; |
| 1618 | } else if (ret == 0) { |
| 1619 | (void) poll(NULL, 0, ACTIVE_POLL_DELAY); |
| 1620 | } else { |
| 1621 | /* |
| 1622 | * If ask_new_stream got streams from a trace we did not know |
| 1623 | * about until now, we have to reinitialize the iterator. |
| 1624 | */ |
| 1625 | goto retry; |
| 1626 | } |
| 1627 | } |
| 1628 | } |
| 1629 | |
| 1630 | ret = 0; |
| 1631 | |
| 1632 | end: |
| 1633 | printf_verbose("End check traces metadata\n"); |
| 1634 | return ret; |
| 1635 | } |
| 1636 | |
| 1637 | static |
| 1638 | int add_traces(struct lttng_live_ctx *ctx) |
| 1639 | { |
| 1640 | int ret; |
| 1641 | struct lttng_live_ctf_trace *trace; |
| 1642 | GHashTableIter it; |
| 1643 | gpointer key; |
| 1644 | gpointer value; |
| 1645 | unsigned int nr_traces; |
| 1646 | |
| 1647 | printf_verbose("Begin add traces\n"); |
| 1648 | |
| 1649 | retry: |
| 1650 | nr_traces = g_hash_table_size(ctx->session->ctf_traces); |
| 1651 | |
| 1652 | ret = check_traces_metadata(ctx); |
| 1653 | if (ret < 0) { |
| 1654 | goto end; |
| 1655 | } |
| 1656 | |
| 1657 | g_hash_table_iter_init(&it, ctx->session->ctf_traces); |
| 1658 | while (g_hash_table_iter_next(&it, &key, &value)) { |
| 1659 | trace = (struct lttng_live_ctf_trace *) value; |
| 1660 | ret = add_one_trace(ctx, trace); |
| 1661 | if (ret < 0) { |
| 1662 | goto end; |
| 1663 | } |
| 1664 | /* |
| 1665 | * If a new trace got added while we were adding the trace, the |
| 1666 | * iterator is invalid and we have to restart. |
| 1667 | */ |
| 1668 | if (g_hash_table_size(ctx->session->ctf_traces) != nr_traces) { |
| 1669 | printf_verbose("New trace(s) added during add_one_trace()\n"); |
| 1670 | goto retry; |
| 1671 | } |
| 1672 | } |
| 1673 | |
| 1674 | ret = 0; |
| 1675 | |
| 1676 | end: |
| 1677 | printf_verbose("End add traces\n"); |
| 1678 | return ret; |
| 1679 | } |
| 1680 | |
| 1681 | /* |
| 1682 | * Request new streams for a session. |
| 1683 | * Returns the number of streams received or a negative value on error. |
| 1684 | */ |
| 1685 | int lttng_live_get_new_streams(struct lttng_live_ctx *ctx, uint64_t id) |
| 1686 | { |
| 1687 | struct lttng_viewer_cmd cmd; |
| 1688 | struct lttng_viewer_new_streams_request rq; |
| 1689 | struct lttng_viewer_new_streams_response rp; |
| 1690 | struct lttng_viewer_stream stream; |
| 1691 | int ret, i, nb_streams = 0; |
| 1692 | ssize_t ret_len; |
| 1693 | uint32_t stream_count; |
| 1694 | const size_t cmd_buf_len = sizeof(cmd) + sizeof(rq); |
| 1695 | char cmd_buf[cmd_buf_len]; |
| 1696 | |
| 1697 | if (lttng_live_should_quit()) { |
| 1698 | ret = -1; |
| 1699 | goto end; |
| 1700 | } |
| 1701 | |
| 1702 | cmd.cmd = htobe32(LTTNG_VIEWER_GET_NEW_STREAMS); |
| 1703 | cmd.data_size = htobe64((uint64_t) sizeof(rq)); |
| 1704 | cmd.cmd_version = htobe32(0); |
| 1705 | |
| 1706 | memset(&rq, 0, sizeof(rq)); |
| 1707 | rq.session_id = htobe64(id); |
| 1708 | |
| 1709 | /* |
| 1710 | * Merge the cmd and connection request to prevent a write-write |
| 1711 | * sequence on the TCP socket. Otherwise, a delayed ACK will prevent the |
| 1712 | * second write to be performed quickly in presence of Nagle's algorithm. |
| 1713 | */ |
| 1714 | memcpy(cmd_buf, &cmd, sizeof(cmd)); |
| 1715 | memcpy(cmd_buf + sizeof(cmd), &rq, sizeof(rq)); |
| 1716 | |
| 1717 | ret_len = lttng_live_send(ctx->control_sock, cmd_buf, cmd_buf_len); |
| 1718 | if (ret_len < 0) { |
| 1719 | perror("[error] Error sending get_new_streams cmd and request"); |
| 1720 | goto error; |
| 1721 | } |
| 1722 | assert(ret_len == cmd_buf_len); |
| 1723 | |
| 1724 | ret_len = lttng_live_recv(ctx->control_sock, &rp, sizeof(rp)); |
| 1725 | if (ret_len == 0) { |
| 1726 | fprintf(stderr, "[error] Remote side has closed connection\n"); |
| 1727 | goto error; |
| 1728 | } |
| 1729 | if (ret_len < 0) { |
| 1730 | perror("[error] Error receiving get_new_streams response"); |
| 1731 | goto error; |
| 1732 | } |
| 1733 | assert(ret_len == sizeof(rp)); |
| 1734 | |
| 1735 | switch(be32toh(rp.status)) { |
| 1736 | case LTTNG_VIEWER_NEW_STREAMS_OK: |
| 1737 | break; |
| 1738 | case LTTNG_VIEWER_NEW_STREAMS_NO_NEW: |
| 1739 | ret = 0; |
| 1740 | goto end; |
| 1741 | case LTTNG_VIEWER_NEW_STREAMS_HUP: |
| 1742 | ret = -LTTNG_VIEWER_NEW_STREAMS_HUP; |
| 1743 | goto end; |
| 1744 | case LTTNG_VIEWER_NEW_STREAMS_ERR: |
| 1745 | fprintf(stderr, "[error] get_new_streams error\n"); |
| 1746 | goto error; |
| 1747 | default: |
| 1748 | fprintf(stderr, "[error] Unknown return code %u\n", |
| 1749 | be32toh(rp.status)); |
| 1750 | goto error; |
| 1751 | } |
| 1752 | |
| 1753 | stream_count = be32toh(rp.streams_count); |
| 1754 | ctx->session->stream_count += stream_count; |
| 1755 | /* |
| 1756 | * When the session is created but not started, we do an active wait |
| 1757 | * until it starts. It allows the viewer to start processing the trace |
| 1758 | * as soon as the session starts. |
| 1759 | */ |
| 1760 | if (ctx->session->stream_count == 0) { |
| 1761 | ret = 0; |
| 1762 | goto end; |
| 1763 | } |
| 1764 | printf_verbose("Waiting for %d streams:\n", stream_count); |
| 1765 | |
| 1766 | for (i = 0; i < stream_count; i++) { |
| 1767 | struct lttng_live_viewer_stream *lvstream; |
| 1768 | |
| 1769 | lvstream = g_new0(struct lttng_live_viewer_stream, 1); |
| 1770 | ret_len = lttng_live_recv(ctx->control_sock, &stream, |
| 1771 | sizeof(stream)); |
| 1772 | if (ret_len == 0) { |
| 1773 | fprintf(stderr, "[error] Remote side has closed connection\n"); |
| 1774 | g_free(lvstream); |
| 1775 | goto error; |
| 1776 | } |
| 1777 | if (ret_len < 0) { |
| 1778 | perror("[error] Error receiving stream"); |
| 1779 | g_free(lvstream); |
| 1780 | goto error; |
| 1781 | } |
| 1782 | assert(ret_len == sizeof(stream)); |
| 1783 | stream.path_name[LTTNG_VIEWER_PATH_MAX - 1] = '\0'; |
| 1784 | stream.channel_name[LTTNG_VIEWER_NAME_MAX - 1] = '\0'; |
| 1785 | |
| 1786 | printf_verbose(" stream %" PRIu64 " : %s/%s\n", |
| 1787 | be64toh(stream.id), stream.path_name, |
| 1788 | stream.channel_name); |
| 1789 | lvstream->id = be64toh(stream.id); |
| 1790 | lvstream->session = ctx->session; |
| 1791 | |
| 1792 | lvstream->mmap_size = 0; |
| 1793 | lvstream->ctf_stream_id = -1ULL; |
| 1794 | |
| 1795 | if (be32toh(stream.metadata_flag)) { |
| 1796 | lvstream->metadata_flag = 1; |
| 1797 | } |
| 1798 | ret = lttng_live_ctf_trace_assign(lvstream, |
| 1799 | be64toh(stream.ctf_trace_id)); |
| 1800 | if (ret < 0) { |
| 1801 | g_free(lvstream); |
| 1802 | goto error; |
| 1803 | } |
| 1804 | nb_streams++; |
| 1805 | bt_list_add(&lvstream->session_stream_node, |
| 1806 | &ctx->session->stream_list); |
| 1807 | } |
| 1808 | ret = nb_streams; |
| 1809 | end: |
| 1810 | return ret; |
| 1811 | |
| 1812 | error: |
| 1813 | return -1; |
| 1814 | } |
| 1815 | |
| 1816 | int lttng_live_read(struct lttng_live_ctx *ctx) |
| 1817 | { |
| 1818 | int ret = -1; |
| 1819 | int i; |
| 1820 | struct bt_ctf_iter *iter; |
| 1821 | const struct bt_ctf_event *event; |
| 1822 | struct bt_iter_pos begin_pos; |
| 1823 | struct bt_trace_descriptor *td_write; |
| 1824 | struct bt_format *fmt_write; |
| 1825 | struct ctf_text_stream_pos *sout; |
| 1826 | uint64_t id; |
| 1827 | |
| 1828 | ctx->bt_ctx = bt_context_create(); |
| 1829 | if (!ctx->bt_ctx) { |
| 1830 | fprintf(stderr, "[error] bt_context_create allocation\n"); |
| 1831 | goto end; |
| 1832 | } |
| 1833 | |
| 1834 | fmt_write = bt_lookup_format(g_quark_from_static_string("text")); |
| 1835 | if (!fmt_write) { |
| 1836 | fprintf(stderr, "[error] ctf-text error\n"); |
| 1837 | goto end_free; |
| 1838 | } |
| 1839 | |
| 1840 | td_write = fmt_write->open_trace(NULL, O_RDWR, NULL, NULL); |
| 1841 | if (!td_write) { |
| 1842 | fprintf(stderr, "[error] Error opening output trace\n"); |
| 1843 | goto end_free; |
| 1844 | } |
| 1845 | |
| 1846 | sout = container_of(td_write, struct ctf_text_stream_pos, |
| 1847 | trace_descriptor); |
| 1848 | if (!sout->parent.event_cb) { |
| 1849 | goto end_free; |
| 1850 | } |
| 1851 | |
| 1852 | ret = lttng_live_create_viewer_session(ctx); |
| 1853 | if (ret < 0) { |
| 1854 | goto end_free; |
| 1855 | } |
| 1856 | |
| 1857 | for (i = 0; i < ctx->session_ids->len; i++) { |
| 1858 | id = g_array_index(ctx->session_ids, uint64_t, i); |
| 1859 | printf_verbose("Attaching to session %" PRIu64 "\n", id); |
| 1860 | ret = lttng_live_attach_session(ctx, id); |
| 1861 | printf_verbose("Attaching session returns %d\n", ret); |
| 1862 | if (ret < 0) { |
| 1863 | if (ret == -LTTNG_VIEWER_ATTACH_UNK) { |
| 1864 | fprintf(stderr, "[error] Unknown session ID\n"); |
| 1865 | } |
| 1866 | goto end_free; |
| 1867 | } |
| 1868 | } |
| 1869 | |
| 1870 | /* |
| 1871 | * As long as the session is active, we try to get new streams. |
| 1872 | */ |
| 1873 | for (;;) { |
| 1874 | int flags; |
| 1875 | |
| 1876 | if (lttng_live_should_quit()) { |
| 1877 | ret = 0; |
| 1878 | goto end_free; |
| 1879 | } |
| 1880 | |
| 1881 | while (!ctx->session->stream_count) { |
| 1882 | if (lttng_live_should_quit() |
| 1883 | || ctx->session_ids->len == 0) { |
| 1884 | ret = 0; |
| 1885 | goto end_free; |
| 1886 | } |
| 1887 | ret = ask_new_streams(ctx); |
| 1888 | if (ret < 0) { |
| 1889 | ret = 0; |
| 1890 | goto end_free; |
| 1891 | } |
| 1892 | if (!ctx->session->stream_count) { |
| 1893 | (void) poll(NULL, 0, ACTIVE_POLL_DELAY); |
| 1894 | } |
| 1895 | } |
| 1896 | |
| 1897 | ret = add_traces(ctx); |
| 1898 | if (ret < 0) { |
| 1899 | goto end_free; |
| 1900 | } |
| 1901 | |
| 1902 | begin_pos.type = BT_SEEK_BEGIN; |
| 1903 | iter = bt_ctf_iter_create(ctx->bt_ctx, &begin_pos, NULL); |
| 1904 | if (!iter) { |
| 1905 | if (lttng_live_should_quit()) { |
| 1906 | ret = 0; |
| 1907 | goto end_free; |
| 1908 | } |
| 1909 | fprintf(stderr, "[error] Iterator creation error\n"); |
| 1910 | goto end_free; |
| 1911 | } |
| 1912 | for (;;) { |
| 1913 | if (lttng_live_should_quit()) { |
| 1914 | ret = 0; |
| 1915 | goto end_free; |
| 1916 | } |
| 1917 | event = bt_ctf_iter_read_event_flags(iter, &flags); |
| 1918 | if (!(flags & BT_ITER_FLAG_RETRY)) { |
| 1919 | if (!event) { |
| 1920 | /* End of trace */ |
| 1921 | break; |
| 1922 | } |
| 1923 | ret = sout->parent.event_cb(&sout->parent, |
| 1924 | event->parent->stream); |
| 1925 | if (ret) { |
| 1926 | fprintf(stderr, "[error] Writing " |
| 1927 | "event failed.\n"); |
| 1928 | goto end_free; |
| 1929 | } |
| 1930 | } |
| 1931 | ret = bt_iter_next(bt_ctf_get_iter(iter)); |
| 1932 | if (ret < 0) { |
| 1933 | goto end_free; |
| 1934 | } |
| 1935 | } |
| 1936 | bt_ctf_iter_destroy(iter); |
| 1937 | g_hash_table_foreach_remove(ctx->session->ctf_traces, |
| 1938 | del_traces, ctx->bt_ctx); |
| 1939 | ctx->session->stream_count = 0; |
| 1940 | } |
| 1941 | |
| 1942 | end_free: |
| 1943 | g_hash_table_foreach_remove(ctx->session->ctf_traces, |
| 1944 | del_traces, ctx->bt_ctx); |
| 1945 | bt_context_put(ctx->bt_ctx); |
| 1946 | end: |
| 1947 | if (lttng_live_should_quit()) { |
| 1948 | ret = 0; |
| 1949 | } |
| 1950 | return ret; |
| 1951 | } |