| 1 | /* |
| 2 | * SPDX-License-Identifier: MIT |
| 3 | * |
| 4 | * Copyright 2019 Francis Deslauriers <francis.deslauriers@efficios.com> |
| 5 | * Copyright 2016 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
| 6 | */ |
| 7 | |
| 8 | #include <glib.h> |
| 9 | #include <stdint.h> |
| 10 | #include <stdio.h> |
| 11 | |
| 12 | #include <babeltrace2/babeltrace.h> |
| 13 | |
| 14 | #include "common/common.h" |
| 15 | #include "compat/endian.h" /* IWYU pragma: keep */ |
| 16 | #include "cpp-common/bt2s/make-unique.hpp" |
| 17 | |
| 18 | #include "data-stream.hpp" |
| 19 | #include "lttng-live.hpp" |
| 20 | #include "lttng-viewer-abi.hpp" |
| 21 | #include "metadata.hpp" |
| 22 | #include "viewer-connection.hpp" |
| 23 | |
| 24 | #define viewer_handle_send_recv_status(_status, _action, _msg_str) \ |
| 25 | do { \ |
| 26 | switch (_status) { \ |
| 27 | case LTTNG_LIVE_VIEWER_STATUS_INTERRUPTED: \ |
| 28 | break; \ |
| 29 | case LTTNG_LIVE_VIEWER_STATUS_ERROR: \ |
| 30 | BT_CPPLOGE_APPEND_CAUSE_SPEC(viewer_connection->logger, \ |
| 31 | "Error " _action " " _msg_str); \ |
| 32 | break; \ |
| 33 | default: \ |
| 34 | bt_common_abort(); \ |
| 35 | } \ |
| 36 | } while (0) |
| 37 | |
| 38 | #define viewer_handle_send_status(_status, _msg_str) \ |
| 39 | viewer_handle_send_recv_status(_status, "sending", _msg_str) |
| 40 | |
| 41 | #define viewer_handle_recv_status(_status, _msg_str) \ |
| 42 | viewer_handle_send_recv_status(_status, "receiving", _msg_str) |
| 43 | |
| 44 | #define LTTNG_LIVE_CPPLOGE_APPEND_CAUSE_ERRNO(_msg, _fmt, ...) \ |
| 45 | do { \ |
| 46 | BT_CPPLOGE_APPEND_CAUSE_SPEC(viewer_connection->logger, _msg ": {}" _fmt, \ |
| 47 | bt_socket_errormsg(), ##__VA_ARGS__); \ |
| 48 | } while (0) |
| 49 | |
| 50 | static inline enum lttng_live_iterator_status |
| 51 | viewer_status_to_live_iterator_status(enum lttng_live_viewer_status viewer_status) |
| 52 | { |
| 53 | switch (viewer_status) { |
| 54 | case LTTNG_LIVE_VIEWER_STATUS_OK: |
| 55 | return LTTNG_LIVE_ITERATOR_STATUS_OK; |
| 56 | case LTTNG_LIVE_VIEWER_STATUS_INTERRUPTED: |
| 57 | return LTTNG_LIVE_ITERATOR_STATUS_AGAIN; |
| 58 | case LTTNG_LIVE_VIEWER_STATUS_ERROR: |
| 59 | return LTTNG_LIVE_ITERATOR_STATUS_ERROR; |
| 60 | } |
| 61 | |
| 62 | bt_common_abort(); |
| 63 | } |
| 64 | |
| 65 | static inline enum ctf_msg_iter_medium_status |
| 66 | viewer_status_to_ctf_msg_iter_medium_status(enum lttng_live_viewer_status viewer_status) |
| 67 | { |
| 68 | switch (viewer_status) { |
| 69 | case LTTNG_LIVE_VIEWER_STATUS_OK: |
| 70 | return CTF_MSG_ITER_MEDIUM_STATUS_OK; |
| 71 | case LTTNG_LIVE_VIEWER_STATUS_INTERRUPTED: |
| 72 | return CTF_MSG_ITER_MEDIUM_STATUS_AGAIN; |
| 73 | case LTTNG_LIVE_VIEWER_STATUS_ERROR: |
| 74 | return CTF_MSG_ITER_MEDIUM_STATUS_ERROR; |
| 75 | } |
| 76 | |
| 77 | bt_common_abort(); |
| 78 | } |
| 79 | |
| 80 | static inline void viewer_connection_close_socket(struct live_viewer_connection *viewer_connection) |
| 81 | { |
| 82 | int ret = bt_socket_close(viewer_connection->control_sock); |
| 83 | if (ret == -1) { |
| 84 | BT_CPPLOGW_ERRNO_SPEC(viewer_connection->logger, |
| 85 | "Error closing viewer connection socket: ", "."); |
| 86 | } |
| 87 | |
| 88 | viewer_connection->control_sock = BT_INVALID_SOCKET; |
| 89 | } |
| 90 | |
| 91 | /* |
| 92 | * This function receives a message from the Relay daemon. |
| 93 | * If it received the entire message, it returns _OK, |
| 94 | * If it's interrupted, it returns _INTERRUPTED, |
| 95 | * otherwise, it returns _ERROR. |
| 96 | */ |
| 97 | static enum lttng_live_viewer_status |
| 98 | lttng_live_recv(struct live_viewer_connection *viewer_connection, void *buf, size_t len) |
| 99 | { |
| 100 | ssize_t received; |
| 101 | size_t total_received = 0, to_receive = len; |
| 102 | struct lttng_live_msg_iter *lttng_live_msg_iter = viewer_connection->lttng_live_msg_iter; |
| 103 | enum lttng_live_viewer_status status; |
| 104 | BT_SOCKET sock = viewer_connection->control_sock; |
| 105 | |
| 106 | /* |
| 107 | * Receive a message from the Relay. |
| 108 | */ |
| 109 | do { |
| 110 | received = bt_socket_recv(sock, (char *) buf + total_received, to_receive, 0); |
| 111 | if (received == BT_SOCKET_ERROR) { |
| 112 | if (bt_socket_interrupted()) { |
| 113 | if (lttng_live_graph_is_canceled(lttng_live_msg_iter)) { |
| 114 | /* |
| 115 | * This interruption was due to a |
| 116 | * SIGINT and the graph is being torn |
| 117 | * down. |
| 118 | */ |
| 119 | status = LTTNG_LIVE_VIEWER_STATUS_INTERRUPTED; |
| 120 | lttng_live_msg_iter->was_interrupted = true; |
| 121 | goto end; |
| 122 | } else { |
| 123 | /* |
| 124 | * A signal was received, but the graph |
| 125 | * is not being torn down. Carry on. |
| 126 | */ |
| 127 | continue; |
| 128 | } |
| 129 | } else { |
| 130 | /* |
| 131 | * For any other types of socket error, close |
| 132 | * the socket and return an error. |
| 133 | */ |
| 134 | LTTNG_LIVE_CPPLOGE_APPEND_CAUSE_ERRNO("Error receiving from Relay", "."); |
| 135 | |
| 136 | viewer_connection_close_socket(viewer_connection); |
| 137 | status = LTTNG_LIVE_VIEWER_STATUS_ERROR; |
| 138 | goto end; |
| 139 | } |
| 140 | } else if (received == 0) { |
| 141 | /* |
| 142 | * The recv() call returned 0. This means the |
| 143 | * connection was orderly shutdown from the other peer. |
| 144 | * If that happens when we are trying to receive |
| 145 | * a message from it, it means something when wrong. |
| 146 | * Close the socket and return an error. |
| 147 | */ |
| 148 | BT_CPPLOGE_APPEND_CAUSE_SPEC(viewer_connection->logger, |
| 149 | "Remote side has closed connection"); |
| 150 | viewer_connection_close_socket(viewer_connection); |
| 151 | status = LTTNG_LIVE_VIEWER_STATUS_ERROR; |
| 152 | goto end; |
| 153 | } |
| 154 | |
| 155 | BT_ASSERT(received <= to_receive); |
| 156 | total_received += received; |
| 157 | to_receive -= received; |
| 158 | |
| 159 | } while (to_receive > 0); |
| 160 | |
| 161 | BT_ASSERT(total_received == len); |
| 162 | status = LTTNG_LIVE_VIEWER_STATUS_OK; |
| 163 | |
| 164 | end: |
| 165 | return status; |
| 166 | } |
| 167 | |
| 168 | /* |
| 169 | * This function sends a message to the Relay daemon. |
| 170 | * If it send the message, it returns _OK, |
| 171 | * If it's interrupted, it returns _INTERRUPTED, |
| 172 | * otherwise, it returns _ERROR. |
| 173 | */ |
| 174 | static enum lttng_live_viewer_status |
| 175 | lttng_live_send(struct live_viewer_connection *viewer_connection, const void *buf, size_t len) |
| 176 | { |
| 177 | enum lttng_live_viewer_status status; |
| 178 | struct lttng_live_msg_iter *lttng_live_msg_iter = viewer_connection->lttng_live_msg_iter; |
| 179 | BT_SOCKET sock = viewer_connection->control_sock; |
| 180 | size_t to_send = len; |
| 181 | ssize_t total_sent = 0; |
| 182 | |
| 183 | do { |
| 184 | ssize_t sent = bt_socket_send_nosigpipe(sock, (char *) buf + total_sent, to_send); |
| 185 | if (sent == BT_SOCKET_ERROR) { |
| 186 | if (bt_socket_interrupted()) { |
| 187 | if (lttng_live_graph_is_canceled(lttng_live_msg_iter)) { |
| 188 | /* |
| 189 | * This interruption was a SIGINT and |
| 190 | * the graph is being teared down. |
| 191 | */ |
| 192 | status = LTTNG_LIVE_VIEWER_STATUS_INTERRUPTED; |
| 193 | lttng_live_msg_iter->was_interrupted = true; |
| 194 | goto end; |
| 195 | } else { |
| 196 | /* |
| 197 | * A signal was received, but the graph |
| 198 | * is not being teared down. Carry on. |
| 199 | */ |
| 200 | continue; |
| 201 | } |
| 202 | } else { |
| 203 | /* |
| 204 | * For any other types of socket error, close |
| 205 | * the socket and return an error. |
| 206 | */ |
| 207 | LTTNG_LIVE_CPPLOGE_APPEND_CAUSE_ERRNO("Error sending to Relay", "."); |
| 208 | |
| 209 | viewer_connection_close_socket(viewer_connection); |
| 210 | status = LTTNG_LIVE_VIEWER_STATUS_ERROR; |
| 211 | goto end; |
| 212 | } |
| 213 | } |
| 214 | |
| 215 | BT_ASSERT(sent <= to_send); |
| 216 | total_sent += sent; |
| 217 | to_send -= sent; |
| 218 | |
| 219 | } while (to_send > 0); |
| 220 | |
| 221 | BT_ASSERT(total_sent == len); |
| 222 | status = LTTNG_LIVE_VIEWER_STATUS_OK; |
| 223 | |
| 224 | end: |
| 225 | return status; |
| 226 | } |
| 227 | |
| 228 | static int parse_url(struct live_viewer_connection *viewer_connection) |
| 229 | { |
| 230 | char error_buf[256] = {0}; |
| 231 | struct bt_common_lttng_live_url_parts lttng_live_url_parts = {}; |
| 232 | bt_common_lttng_live_url_parts_deleter partsDeleter {lttng_live_url_parts}; |
| 233 | int ret = -1; |
| 234 | |
| 235 | if (viewer_connection->url.empty()) { |
| 236 | goto end; |
| 237 | } |
| 238 | |
| 239 | lttng_live_url_parts = bt_common_parse_lttng_live_url(viewer_connection->url.c_str(), error_buf, |
| 240 | sizeof(error_buf)); |
| 241 | if (!lttng_live_url_parts.proto) { |
| 242 | BT_CPPLOGE_APPEND_CAUSE_SPEC(viewer_connection->logger, "Invalid LTTng live URL format: {}", |
| 243 | error_buf); |
| 244 | goto end; |
| 245 | } |
| 246 | viewer_connection->proto.reset(lttng_live_url_parts.proto); |
| 247 | lttng_live_url_parts.proto = NULL; |
| 248 | |
| 249 | viewer_connection->relay_hostname.reset(lttng_live_url_parts.hostname); |
| 250 | lttng_live_url_parts.hostname = NULL; |
| 251 | |
| 252 | if (lttng_live_url_parts.port >= 0) { |
| 253 | viewer_connection->port = lttng_live_url_parts.port; |
| 254 | } else { |
| 255 | viewer_connection->port = LTTNG_DEFAULT_NETWORK_VIEWER_PORT; |
| 256 | } |
| 257 | |
| 258 | viewer_connection->target_hostname.reset(lttng_live_url_parts.target_hostname); |
| 259 | lttng_live_url_parts.target_hostname = NULL; |
| 260 | |
| 261 | if (lttng_live_url_parts.session_name) { |
| 262 | viewer_connection->session_name.reset(lttng_live_url_parts.session_name); |
| 263 | lttng_live_url_parts.session_name = NULL; |
| 264 | } |
| 265 | |
| 266 | ret = 0; |
| 267 | |
| 268 | end: |
| 269 | return ret; |
| 270 | } |
| 271 | |
| 272 | static enum lttng_live_viewer_status |
| 273 | lttng_live_handshake(struct live_viewer_connection *viewer_connection) |
| 274 | { |
| 275 | struct lttng_viewer_cmd cmd; |
| 276 | struct lttng_viewer_connect connect; |
| 277 | enum lttng_live_viewer_status status; |
| 278 | const size_t cmd_buf_len = sizeof(cmd) + sizeof(connect); |
| 279 | char cmd_buf[cmd_buf_len]; |
| 280 | |
| 281 | BT_CPPLOGD_SPEC(viewer_connection->logger, |
| 282 | "Handshaking with the relay daemon: cmd={}, major-version={}, minor-version={}", |
| 283 | LTTNG_VIEWER_CONNECT, LTTNG_LIVE_MAJOR, LTTNG_LIVE_MINOR); |
| 284 | |
| 285 | cmd.cmd = htobe32(LTTNG_VIEWER_CONNECT); |
| 286 | cmd.data_size = htobe64((uint64_t) sizeof(connect)); |
| 287 | cmd.cmd_version = htobe32(0); |
| 288 | |
| 289 | connect.viewer_session_id = -1ULL; /* will be set on recv */ |
| 290 | connect.major = htobe32(LTTNG_LIVE_MAJOR); |
| 291 | connect.minor = htobe32(LTTNG_LIVE_MINOR); |
| 292 | connect.type = htobe32(LTTNG_VIEWER_CLIENT_COMMAND); |
| 293 | |
| 294 | /* |
| 295 | * Merge the cmd and connection request to prevent a write-write |
| 296 | * sequence on the TCP socket. Otherwise, a delayed ACK will prevent the |
| 297 | * second write to be performed quickly in presence of Nagle's algorithm |
| 298 | */ |
| 299 | memcpy(cmd_buf, &cmd, sizeof(cmd)); |
| 300 | memcpy(cmd_buf + sizeof(cmd), &connect, sizeof(connect)); |
| 301 | |
| 302 | status = lttng_live_send(viewer_connection, &cmd_buf, cmd_buf_len); |
| 303 | if (status != LTTNG_LIVE_VIEWER_STATUS_OK) { |
| 304 | viewer_handle_send_status(status, "viewer connect command"); |
| 305 | goto end; |
| 306 | } |
| 307 | |
| 308 | status = lttng_live_recv(viewer_connection, &connect, sizeof(connect)); |
| 309 | if (status != LTTNG_LIVE_VIEWER_STATUS_OK) { |
| 310 | viewer_handle_recv_status(status, "viewer connect reply"); |
| 311 | goto end; |
| 312 | } |
| 313 | |
| 314 | BT_CPPLOGI_SPEC(viewer_connection->logger, "Received viewer session ID : {}", |
| 315 | (uint64_t) be64toh(connect.viewer_session_id)); |
| 316 | BT_CPPLOGI_SPEC(viewer_connection->logger, "Relayd version : {}.{}", be32toh(connect.major), |
| 317 | be32toh(connect.minor)); |
| 318 | |
| 319 | if (LTTNG_LIVE_MAJOR != be32toh(connect.major)) { |
| 320 | BT_CPPLOGE_APPEND_CAUSE_SPEC(viewer_connection->logger, |
| 321 | "Incompatible lttng-relayd protocol"); |
| 322 | status = LTTNG_LIVE_VIEWER_STATUS_ERROR; |
| 323 | goto end; |
| 324 | } |
| 325 | /* Use the smallest protocol version implemented. */ |
| 326 | if (LTTNG_LIVE_MINOR > be32toh(connect.minor)) { |
| 327 | viewer_connection->minor = be32toh(connect.minor); |
| 328 | } else { |
| 329 | viewer_connection->minor = LTTNG_LIVE_MINOR; |
| 330 | } |
| 331 | viewer_connection->major = LTTNG_LIVE_MAJOR; |
| 332 | |
| 333 | status = LTTNG_LIVE_VIEWER_STATUS_OK; |
| 334 | |
| 335 | goto end; |
| 336 | |
| 337 | end: |
| 338 | return status; |
| 339 | } |
| 340 | |
| 341 | static enum lttng_live_viewer_status |
| 342 | lttng_live_connect_viewer(struct live_viewer_connection *viewer_connection) |
| 343 | { |
| 344 | struct hostent *host; |
| 345 | struct sockaddr_in server_addr; |
| 346 | enum lttng_live_viewer_status status; |
| 347 | |
| 348 | if (parse_url(viewer_connection)) { |
| 349 | BT_CPPLOGE_APPEND_CAUSE_SPEC(viewer_connection->logger, "Failed to parse URL"); |
| 350 | status = LTTNG_LIVE_VIEWER_STATUS_ERROR; |
| 351 | goto error; |
| 352 | } |
| 353 | |
| 354 | BT_CPPLOGD_SPEC( |
| 355 | viewer_connection->logger, |
| 356 | "Connecting to hostname : {}, port : {}, target hostname : {}, session name : {}, proto : {}", |
| 357 | viewer_connection->relay_hostname->str, viewer_connection->port, |
| 358 | !viewer_connection->target_hostname ? "<none>" : viewer_connection->target_hostname->str, |
| 359 | !viewer_connection->session_name ? "<none>" : viewer_connection->session_name->str, |
| 360 | viewer_connection->proto->str); |
| 361 | |
| 362 | host = gethostbyname(viewer_connection->relay_hostname->str); |
| 363 | if (!host) { |
| 364 | BT_CPPLOGE_APPEND_CAUSE_SPEC(viewer_connection->logger, |
| 365 | "Cannot lookup hostname: hostname=\"{}\"", |
| 366 | viewer_connection->relay_hostname->str); |
| 367 | status = LTTNG_LIVE_VIEWER_STATUS_ERROR; |
| 368 | goto error; |
| 369 | } |
| 370 | |
| 371 | if ((viewer_connection->control_sock = socket(AF_INET, SOCK_STREAM, 0)) == BT_INVALID_SOCKET) { |
| 372 | BT_CPPLOGE_APPEND_CAUSE_SPEC(viewer_connection->logger, "Socket creation failed: {}", |
| 373 | bt_socket_errormsg()); |
| 374 | status = LTTNG_LIVE_VIEWER_STATUS_ERROR; |
| 375 | goto error; |
| 376 | } |
| 377 | |
| 378 | server_addr.sin_family = AF_INET; |
| 379 | server_addr.sin_port = htons(viewer_connection->port); |
| 380 | server_addr.sin_addr = *((struct in_addr *) host->h_addr); |
| 381 | memset(&(server_addr.sin_zero), 0, 8); |
| 382 | |
| 383 | if (connect(viewer_connection->control_sock, (struct sockaddr *) &server_addr, |
| 384 | sizeof(struct sockaddr)) == BT_SOCKET_ERROR) { |
| 385 | BT_CPPLOGE_APPEND_CAUSE_SPEC(viewer_connection->logger, "Connection failed: {}", |
| 386 | bt_socket_errormsg()); |
| 387 | status = LTTNG_LIVE_VIEWER_STATUS_ERROR; |
| 388 | goto error; |
| 389 | } |
| 390 | |
| 391 | status = lttng_live_handshake(viewer_connection); |
| 392 | |
| 393 | /* |
| 394 | * Only print error and append cause in case of error. not in case of |
| 395 | * interruption. |
| 396 | */ |
| 397 | if (status == LTTNG_LIVE_VIEWER_STATUS_ERROR) { |
| 398 | BT_CPPLOGE_APPEND_CAUSE_SPEC(viewer_connection->logger, "Viewer handshake failed"); |
| 399 | goto error; |
| 400 | } else if (status == LTTNG_LIVE_VIEWER_STATUS_INTERRUPTED) { |
| 401 | goto end; |
| 402 | } |
| 403 | |
| 404 | goto end; |
| 405 | |
| 406 | error: |
| 407 | if (viewer_connection->control_sock != BT_INVALID_SOCKET) { |
| 408 | if (bt_socket_close(viewer_connection->control_sock) == BT_SOCKET_ERROR) { |
| 409 | BT_CPPLOGW_SPEC(viewer_connection->logger, "Error closing socket: {}.", |
| 410 | bt_socket_errormsg()); |
| 411 | } |
| 412 | } |
| 413 | viewer_connection->control_sock = BT_INVALID_SOCKET; |
| 414 | end: |
| 415 | return status; |
| 416 | } |
| 417 | |
| 418 | static void lttng_live_disconnect_viewer(struct live_viewer_connection *viewer_connection) |
| 419 | { |
| 420 | if (viewer_connection->control_sock == BT_INVALID_SOCKET) { |
| 421 | return; |
| 422 | } |
| 423 | if (bt_socket_close(viewer_connection->control_sock) == BT_SOCKET_ERROR) { |
| 424 | BT_CPPLOGW_SPEC(viewer_connection->logger, "Error closing socket: {}", |
| 425 | bt_socket_errormsg()); |
| 426 | viewer_connection->control_sock = BT_INVALID_SOCKET; |
| 427 | } |
| 428 | } |
| 429 | |
| 430 | static int list_update_session(const bt2::ArrayValue results, |
| 431 | const struct lttng_viewer_session *session, bool *_found, |
| 432 | struct live_viewer_connection *viewer_connection) |
| 433 | { |
| 434 | bool found = false; |
| 435 | |
| 436 | for (const auto value : results) { |
| 437 | const auto map = value.asMap(); |
| 438 | const auto hostnameVal = map["target-hostname"]; |
| 439 | |
| 440 | if (!hostnameVal) { |
| 441 | BT_CPPLOGE_APPEND_CAUSE_SPEC(viewer_connection->logger, |
| 442 | "Error borrowing \"target-hostname\" entry."); |
| 443 | return -1; |
| 444 | } |
| 445 | |
| 446 | const auto sessionNameVal = map["session-name"]; |
| 447 | |
| 448 | if (!sessionNameVal) { |
| 449 | BT_CPPLOGE_APPEND_CAUSE_SPEC(viewer_connection->logger, |
| 450 | "Error borrowing \"session-name\" entry."); |
| 451 | return -1; |
| 452 | } |
| 453 | |
| 454 | const auto hostname_str = hostnameVal->asString().value(); |
| 455 | const auto session_name_str = sessionNameVal->asString().value(); |
| 456 | |
| 457 | if (strcmp(session->hostname, hostname_str) == 0 && |
| 458 | strcmp(session->session_name, session_name_str) == 0) { |
| 459 | uint32_t streams = be32toh(session->streams); |
| 460 | uint32_t clients = be32toh(session->clients); |
| 461 | |
| 462 | found = true; |
| 463 | |
| 464 | const auto streamCountVal = map["stream-count"]; |
| 465 | |
| 466 | if (!streamCountVal) { |
| 467 | BT_CPPLOGE_APPEND_CAUSE_SPEC(viewer_connection->logger, |
| 468 | "Error borrowing \"stream-count\" entry."); |
| 469 | return -1; |
| 470 | } |
| 471 | |
| 472 | auto val = streamCountVal->asUnsignedInteger().value(); |
| 473 | |
| 474 | /* sum */ |
| 475 | val += streams; |
| 476 | streamCountVal->asUnsignedInteger().value(val); |
| 477 | |
| 478 | const auto clientCountVal = map["client-count"]; |
| 479 | |
| 480 | if (!clientCountVal) { |
| 481 | BT_CPPLOGE_APPEND_CAUSE_SPEC(viewer_connection->logger, |
| 482 | "Error borrowing \"client-count\" entry."); |
| 483 | return -1; |
| 484 | } |
| 485 | |
| 486 | val = clientCountVal->asUnsignedInteger().value(); |
| 487 | |
| 488 | /* max */ |
| 489 | val = std::max<uint64_t>(clients, val); |
| 490 | clientCountVal->asUnsignedInteger().value(val); |
| 491 | } |
| 492 | |
| 493 | if (found) { |
| 494 | break; |
| 495 | } |
| 496 | } |
| 497 | |
| 498 | *_found = found; |
| 499 | return 0; |
| 500 | } |
| 501 | |
| 502 | static int list_append_session(const bt2::ArrayValue results, const std::string& base_url, |
| 503 | const struct lttng_viewer_session *session, |
| 504 | struct live_viewer_connection *viewer_connection) |
| 505 | { |
| 506 | int ret = 0; |
| 507 | bool found = false; |
| 508 | |
| 509 | /* |
| 510 | * If the session already exists, add the stream count to it, |
| 511 | * and do max of client counts. |
| 512 | */ |
| 513 | ret = list_update_session(results, session, &found, viewer_connection); |
| 514 | if (ret || found) { |
| 515 | return ret; |
| 516 | } |
| 517 | |
| 518 | const auto map = bt2::MapValue::create(); |
| 519 | |
| 520 | if (base_url.empty()) { |
| 521 | BT_CPPLOGE_APPEND_CAUSE_SPEC(viewer_connection->logger, "Error: base_url empty."); |
| 522 | return -1; |
| 523 | } |
| 524 | |
| 525 | /* |
| 526 | * key = "url", |
| 527 | * value = <string>, |
| 528 | */ |
| 529 | map->insert("url", |
| 530 | fmt::format("{}/host/{}/{}", base_url, session->hostname, session->session_name)); |
| 531 | |
| 532 | /* |
| 533 | * key = "target-hostname", |
| 534 | * value = <string>, |
| 535 | */ |
| 536 | map->insert("target-hostname", session->hostname); |
| 537 | |
| 538 | /* |
| 539 | * key = "session-name", |
| 540 | * value = <string>, |
| 541 | */ |
| 542 | map->insert("session-name", session->session_name); |
| 543 | |
| 544 | /* |
| 545 | * key = "timer-us", |
| 546 | * value = <integer>, |
| 547 | */ |
| 548 | { |
| 549 | uint32_t live_timer = be32toh(session->live_timer); |
| 550 | |
| 551 | map->insert("timer-us", (uint64_t) live_timer); |
| 552 | } |
| 553 | |
| 554 | /* |
| 555 | * key = "stream-count", |
| 556 | * value = <integer>, |
| 557 | */ |
| 558 | { |
| 559 | uint32_t streams = be32toh(session->streams); |
| 560 | |
| 561 | map->insert("stream-count", (uint64_t) streams); |
| 562 | } |
| 563 | |
| 564 | /* |
| 565 | * key = "client-count", |
| 566 | * value = <integer>, |
| 567 | */ |
| 568 | { |
| 569 | uint32_t clients = be32toh(session->clients); |
| 570 | |
| 571 | map->insert("client-count", (uint64_t) clients); |
| 572 | } |
| 573 | |
| 574 | results.append(*map); |
| 575 | return 0; |
| 576 | } |
| 577 | |
| 578 | /* |
| 579 | * Data structure returned: |
| 580 | * |
| 581 | * { |
| 582 | * <array> = { |
| 583 | * [n] = { |
| 584 | * <map> = { |
| 585 | * { |
| 586 | * key = "url", |
| 587 | * value = <string>, |
| 588 | * }, |
| 589 | * { |
| 590 | * key = "target-hostname", |
| 591 | * value = <string>, |
| 592 | * }, |
| 593 | * { |
| 594 | * key = "session-name", |
| 595 | * value = <string>, |
| 596 | * }, |
| 597 | * { |
| 598 | * key = "timer-us", |
| 599 | * value = <integer>, |
| 600 | * }, |
| 601 | * { |
| 602 | * key = "stream-count", |
| 603 | * value = <integer>, |
| 604 | * }, |
| 605 | * { |
| 606 | * key = "client-count", |
| 607 | * value = <integer>, |
| 608 | * }, |
| 609 | * }, |
| 610 | * } |
| 611 | * } |
| 612 | */ |
| 613 | |
| 614 | bt_component_class_query_method_status |
| 615 | live_viewer_connection_list_sessions(struct live_viewer_connection *viewer_connection, |
| 616 | bt2::Value::Shared& user_result) |
| 617 | { |
| 618 | enum lttng_live_viewer_status viewer_status; |
| 619 | struct lttng_viewer_cmd cmd; |
| 620 | struct lttng_viewer_list_sessions list; |
| 621 | uint32_t i, sessions_count; |
| 622 | auto result = bt2::ArrayValue::create(); |
| 623 | |
| 624 | BT_CPPLOGD_SPEC(viewer_connection->logger, "Requesting list of sessions: cmd={}", |
| 625 | LTTNG_VIEWER_LIST_SESSIONS); |
| 626 | |
| 627 | cmd.cmd = htobe32(LTTNG_VIEWER_LIST_SESSIONS); |
| 628 | cmd.data_size = htobe64((uint64_t) 0); |
| 629 | cmd.cmd_version = htobe32(0); |
| 630 | |
| 631 | viewer_status = lttng_live_send(viewer_connection, &cmd, sizeof(cmd)); |
| 632 | if (viewer_status == LTTNG_LIVE_VIEWER_STATUS_ERROR) { |
| 633 | BT_CPPLOGE_APPEND_CAUSE_SPEC(viewer_connection->logger, |
| 634 | "Error sending list sessions command"); |
| 635 | return BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_ERROR; |
| 636 | } else if (viewer_status == LTTNG_LIVE_VIEWER_STATUS_INTERRUPTED) { |
| 637 | return BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_AGAIN; |
| 638 | } |
| 639 | |
| 640 | viewer_status = lttng_live_recv(viewer_connection, &list, sizeof(list)); |
| 641 | if (viewer_status == LTTNG_LIVE_VIEWER_STATUS_ERROR) { |
| 642 | BT_CPPLOGE_APPEND_CAUSE_SPEC(viewer_connection->logger, "Error receiving session list"); |
| 643 | return BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_ERROR; |
| 644 | } else if (viewer_status == LTTNG_LIVE_VIEWER_STATUS_INTERRUPTED) { |
| 645 | return BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_AGAIN; |
| 646 | } |
| 647 | |
| 648 | sessions_count = be32toh(list.sessions_count); |
| 649 | for (i = 0; i < sessions_count; i++) { |
| 650 | struct lttng_viewer_session lsession; |
| 651 | |
| 652 | viewer_status = lttng_live_recv(viewer_connection, &lsession, sizeof(lsession)); |
| 653 | if (viewer_status == LTTNG_LIVE_VIEWER_STATUS_ERROR) { |
| 654 | BT_CPPLOGE_APPEND_CAUSE_SPEC(viewer_connection->logger, "Error receiving session:"); |
| 655 | return BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_ERROR; |
| 656 | } else if (viewer_status == LTTNG_LIVE_VIEWER_STATUS_INTERRUPTED) { |
| 657 | return BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_AGAIN; |
| 658 | } |
| 659 | |
| 660 | lsession.hostname[LTTNG_VIEWER_HOST_NAME_MAX - 1] = '\0'; |
| 661 | lsession.session_name[LTTNG_VIEWER_NAME_MAX - 1] = '\0'; |
| 662 | if (list_append_session(*result, viewer_connection->url, &lsession, viewer_connection)) { |
| 663 | BT_CPPLOGE_APPEND_CAUSE_SPEC(viewer_connection->logger, "Error appending session"); |
| 664 | return BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_ERROR; |
| 665 | } |
| 666 | } |
| 667 | |
| 668 | user_result = std::move(result); |
| 669 | return BT_COMPONENT_CLASS_QUERY_METHOD_STATUS_OK; |
| 670 | } |
| 671 | |
| 672 | static enum lttng_live_viewer_status |
| 673 | lttng_live_query_session_ids(struct lttng_live_msg_iter *lttng_live_msg_iter) |
| 674 | { |
| 675 | struct lttng_viewer_cmd cmd; |
| 676 | struct lttng_viewer_list_sessions list; |
| 677 | struct lttng_viewer_session lsession; |
| 678 | uint32_t i, sessions_count; |
| 679 | uint64_t session_id; |
| 680 | enum lttng_live_viewer_status status; |
| 681 | live_viewer_connection *viewer_connection = lttng_live_msg_iter->viewer_connection.get(); |
| 682 | |
| 683 | BT_CPPLOGD_SPEC(viewer_connection->logger, |
| 684 | "Asking the relay daemon for the list of sessions: cmd={}", |
| 685 | LTTNG_VIEWER_LIST_SESSIONS); |
| 686 | |
| 687 | cmd.cmd = htobe32(LTTNG_VIEWER_LIST_SESSIONS); |
| 688 | cmd.data_size = htobe64((uint64_t) 0); |
| 689 | cmd.cmd_version = htobe32(0); |
| 690 | |
| 691 | status = lttng_live_send(viewer_connection, &cmd, sizeof(cmd)); |
| 692 | if (status != LTTNG_LIVE_VIEWER_STATUS_OK) { |
| 693 | viewer_handle_send_status(status, "list sessions command"); |
| 694 | goto end; |
| 695 | } |
| 696 | |
| 697 | status = lttng_live_recv(viewer_connection, &list, sizeof(list)); |
| 698 | if (status != LTTNG_LIVE_VIEWER_STATUS_OK) { |
| 699 | viewer_handle_recv_status(status, "session list reply"); |
| 700 | goto end; |
| 701 | } |
| 702 | |
| 703 | sessions_count = be32toh(list.sessions_count); |
| 704 | for (i = 0; i < sessions_count; i++) { |
| 705 | status = lttng_live_recv(viewer_connection, &lsession, sizeof(lsession)); |
| 706 | if (status != LTTNG_LIVE_VIEWER_STATUS_OK) { |
| 707 | viewer_handle_recv_status(status, "session reply"); |
| 708 | goto end; |
| 709 | } |
| 710 | lsession.hostname[LTTNG_VIEWER_HOST_NAME_MAX - 1] = '\0'; |
| 711 | lsession.session_name[LTTNG_VIEWER_NAME_MAX - 1] = '\0'; |
| 712 | session_id = be64toh(lsession.id); |
| 713 | |
| 714 | BT_CPPLOGI_SPEC(viewer_connection->logger, |
| 715 | "Adding session to internal list: " |
| 716 | "session-id={}, hostname=\"{}\", session-name=\"{}\"", |
| 717 | session_id, lsession.hostname, lsession.session_name); |
| 718 | |
| 719 | if ((strncmp(lsession.session_name, viewer_connection->session_name->str, |
| 720 | LTTNG_VIEWER_NAME_MAX) == 0) && |
| 721 | (strncmp(lsession.hostname, viewer_connection->target_hostname->str, |
| 722 | LTTNG_VIEWER_HOST_NAME_MAX) == 0)) { |
| 723 | if (lttng_live_add_session(lttng_live_msg_iter, session_id, lsession.hostname, |
| 724 | lsession.session_name)) { |
| 725 | BT_CPPLOGE_APPEND_CAUSE_SPEC(viewer_connection->logger, |
| 726 | "Failed to add live session"); |
| 727 | status = LTTNG_LIVE_VIEWER_STATUS_ERROR; |
| 728 | goto end; |
| 729 | } |
| 730 | } |
| 731 | } |
| 732 | |
| 733 | status = LTTNG_LIVE_VIEWER_STATUS_OK; |
| 734 | |
| 735 | end: |
| 736 | return status; |
| 737 | } |
| 738 | |
| 739 | enum lttng_live_viewer_status |
| 740 | lttng_live_create_viewer_session(struct lttng_live_msg_iter *lttng_live_msg_iter) |
| 741 | { |
| 742 | struct lttng_viewer_cmd cmd; |
| 743 | struct lttng_viewer_create_session_response resp; |
| 744 | enum lttng_live_viewer_status status; |
| 745 | live_viewer_connection *viewer_connection = lttng_live_msg_iter->viewer_connection.get(); |
| 746 | |
| 747 | BT_CPPLOGD_SPEC(viewer_connection->logger, "Creating a viewer session: cmd={}", |
| 748 | LTTNG_VIEWER_CREATE_SESSION); |
| 749 | |
| 750 | cmd.cmd = htobe32(LTTNG_VIEWER_CREATE_SESSION); |
| 751 | cmd.data_size = htobe64((uint64_t) 0); |
| 752 | cmd.cmd_version = htobe32(0); |
| 753 | |
| 754 | status = lttng_live_send(viewer_connection, &cmd, sizeof(cmd)); |
| 755 | if (status != LTTNG_LIVE_VIEWER_STATUS_OK) { |
| 756 | viewer_handle_send_status(status, "create session command"); |
| 757 | goto end; |
| 758 | } |
| 759 | |
| 760 | status = lttng_live_recv(viewer_connection, &resp, sizeof(resp)); |
| 761 | if (status != LTTNG_LIVE_VIEWER_STATUS_OK) { |
| 762 | viewer_handle_recv_status(status, "create session reply"); |
| 763 | goto end; |
| 764 | } |
| 765 | |
| 766 | if (be32toh(resp.status) != LTTNG_VIEWER_CREATE_SESSION_OK) { |
| 767 | BT_CPPLOGE_APPEND_CAUSE_SPEC(viewer_connection->logger, "Error creating viewer session"); |
| 768 | status = LTTNG_LIVE_VIEWER_STATUS_ERROR; |
| 769 | goto end; |
| 770 | } |
| 771 | |
| 772 | status = lttng_live_query_session_ids(lttng_live_msg_iter); |
| 773 | if (status == LTTNG_LIVE_VIEWER_STATUS_ERROR) { |
| 774 | BT_CPPLOGE_APPEND_CAUSE_SPEC(viewer_connection->logger, |
| 775 | "Failed to query live viewer session ids"); |
| 776 | goto end; |
| 777 | } else if (status == LTTNG_LIVE_VIEWER_STATUS_INTERRUPTED) { |
| 778 | goto end; |
| 779 | } |
| 780 | |
| 781 | end: |
| 782 | return status; |
| 783 | } |
| 784 | |
| 785 | static enum lttng_live_viewer_status receive_streams(struct lttng_live_session *session, |
| 786 | uint32_t stream_count, |
| 787 | bt_self_message_iterator *self_msg_iter) |
| 788 | { |
| 789 | uint32_t i; |
| 790 | struct lttng_live_msg_iter *lttng_live_msg_iter = session->lttng_live_msg_iter; |
| 791 | enum lttng_live_viewer_status status; |
| 792 | live_viewer_connection *viewer_connection = lttng_live_msg_iter->viewer_connection.get(); |
| 793 | |
| 794 | BT_CPPLOGI_SPEC(viewer_connection->logger, "Getting {} new streams", stream_count); |
| 795 | for (i = 0; i < stream_count; i++) { |
| 796 | struct lttng_viewer_stream stream; |
| 797 | struct lttng_live_stream_iterator *live_stream; |
| 798 | uint64_t stream_id; |
| 799 | uint64_t ctf_trace_id; |
| 800 | |
| 801 | status = lttng_live_recv(viewer_connection, &stream, sizeof(stream)); |
| 802 | if (status != LTTNG_LIVE_VIEWER_STATUS_OK) { |
| 803 | viewer_handle_recv_status(status, "stream reply"); |
| 804 | goto end; |
| 805 | } |
| 806 | stream.path_name[LTTNG_VIEWER_PATH_MAX - 1] = '\0'; |
| 807 | stream.channel_name[LTTNG_VIEWER_NAME_MAX - 1] = '\0'; |
| 808 | stream_id = be64toh(stream.id); |
| 809 | ctf_trace_id = be64toh(stream.ctf_trace_id); |
| 810 | |
| 811 | if (stream.metadata_flag) { |
| 812 | BT_CPPLOGI_SPEC(viewer_connection->logger, " metadata stream {} : {}/{}", stream_id, |
| 813 | stream.path_name, stream.channel_name); |
| 814 | if (lttng_live_metadata_create_stream(session, ctf_trace_id, stream_id)) { |
| 815 | BT_CPPLOGE_APPEND_CAUSE_SPEC(viewer_connection->logger, |
| 816 | "Error creating metadata stream"); |
| 817 | status = LTTNG_LIVE_VIEWER_STATUS_ERROR; |
| 818 | goto end; |
| 819 | } |
| 820 | session->lazy_stream_msg_init = true; |
| 821 | } else { |
| 822 | BT_CPPLOGI_SPEC(viewer_connection->logger, " stream {} : {}/{}", stream_id, |
| 823 | stream.path_name, stream.channel_name); |
| 824 | live_stream = |
| 825 | lttng_live_stream_iterator_create(session, ctf_trace_id, stream_id, self_msg_iter); |
| 826 | if (!live_stream) { |
| 827 | BT_CPPLOGE_APPEND_CAUSE_SPEC(viewer_connection->logger, "Error creating stream"); |
| 828 | status = LTTNG_LIVE_VIEWER_STATUS_ERROR; |
| 829 | goto end; |
| 830 | } |
| 831 | } |
| 832 | } |
| 833 | status = LTTNG_LIVE_VIEWER_STATUS_OK; |
| 834 | |
| 835 | end: |
| 836 | return status; |
| 837 | } |
| 838 | |
| 839 | enum lttng_live_viewer_status lttng_live_session_attach(struct lttng_live_session *session, |
| 840 | bt_self_message_iterator *self_msg_iter) |
| 841 | { |
| 842 | struct lttng_viewer_cmd cmd; |
| 843 | enum lttng_live_viewer_status status; |
| 844 | struct lttng_viewer_attach_session_request rq; |
| 845 | struct lttng_viewer_attach_session_response rp; |
| 846 | struct lttng_live_msg_iter *lttng_live_msg_iter = session->lttng_live_msg_iter; |
| 847 | live_viewer_connection *viewer_connection = lttng_live_msg_iter->viewer_connection.get(); |
| 848 | uint64_t session_id = session->id; |
| 849 | uint32_t streams_count; |
| 850 | const size_t cmd_buf_len = sizeof(cmd) + sizeof(rq); |
| 851 | char cmd_buf[cmd_buf_len]; |
| 852 | |
| 853 | BT_CPPLOGD_SPEC(viewer_connection->logger, |
| 854 | "Attaching to session: cmd={}, session-id={}, seek={}", |
| 855 | LTTNG_VIEWER_ATTACH_SESSION, session_id, LTTNG_VIEWER_SEEK_LAST); |
| 856 | |
| 857 | cmd.cmd = htobe32(LTTNG_VIEWER_ATTACH_SESSION); |
| 858 | cmd.data_size = htobe64((uint64_t) sizeof(rq)); |
| 859 | cmd.cmd_version = htobe32(0); |
| 860 | |
| 861 | memset(&rq, 0, sizeof(rq)); |
| 862 | rq.session_id = htobe64(session_id); |
| 863 | // TODO: add cmd line parameter to select seek beginning |
| 864 | // rq.seek = htobe32(LTTNG_VIEWER_SEEK_BEGINNING); |
| 865 | rq.seek = htobe32(LTTNG_VIEWER_SEEK_LAST); |
| 866 | |
| 867 | /* |
| 868 | * Merge the cmd and connection request to prevent a write-write |
| 869 | * sequence on the TCP socket. Otherwise, a delayed ACK will prevent the |
| 870 | * second write to be performed quickly in presence of Nagle's algorithm. |
| 871 | */ |
| 872 | memcpy(cmd_buf, &cmd, sizeof(cmd)); |
| 873 | memcpy(cmd_buf + sizeof(cmd), &rq, sizeof(rq)); |
| 874 | status = lttng_live_send(viewer_connection, &cmd_buf, cmd_buf_len); |
| 875 | if (status != LTTNG_LIVE_VIEWER_STATUS_OK) { |
| 876 | viewer_handle_send_status(status, "attach session command"); |
| 877 | goto end; |
| 878 | } |
| 879 | |
| 880 | status = lttng_live_recv(viewer_connection, &rp, sizeof(rp)); |
| 881 | if (status != LTTNG_LIVE_VIEWER_STATUS_OK) { |
| 882 | viewer_handle_recv_status(status, "attach session reply"); |
| 883 | goto end; |
| 884 | } |
| 885 | |
| 886 | streams_count = be32toh(rp.streams_count); |
| 887 | switch (be32toh(rp.status)) { |
| 888 | case LTTNG_VIEWER_ATTACH_OK: |
| 889 | break; |
| 890 | case LTTNG_VIEWER_ATTACH_UNK: |
| 891 | BT_CPPLOGE_APPEND_CAUSE_SPEC(viewer_connection->logger, "Session id {} is unknown", |
| 892 | session_id); |
| 893 | status = LTTNG_LIVE_VIEWER_STATUS_ERROR; |
| 894 | goto end; |
| 895 | case LTTNG_VIEWER_ATTACH_ALREADY: |
| 896 | BT_CPPLOGE_APPEND_CAUSE_SPEC(viewer_connection->logger, |
| 897 | "There is already a viewer attached to this session"); |
| 898 | status = LTTNG_LIVE_VIEWER_STATUS_ERROR; |
| 899 | goto end; |
| 900 | case LTTNG_VIEWER_ATTACH_NOT_LIVE: |
| 901 | BT_CPPLOGE_APPEND_CAUSE_SPEC(viewer_connection->logger, "Not a live session"); |
| 902 | status = LTTNG_LIVE_VIEWER_STATUS_ERROR; |
| 903 | goto end; |
| 904 | case LTTNG_VIEWER_ATTACH_SEEK_ERR: |
| 905 | BT_CPPLOGE_APPEND_CAUSE_SPEC(viewer_connection->logger, "Wrong seek parameter"); |
| 906 | status = LTTNG_LIVE_VIEWER_STATUS_ERROR; |
| 907 | goto end; |
| 908 | default: |
| 909 | BT_CPPLOGE_APPEND_CAUSE_SPEC(viewer_connection->logger, "Unknown attach return code {}", |
| 910 | be32toh(rp.status)); |
| 911 | status = LTTNG_LIVE_VIEWER_STATUS_ERROR; |
| 912 | goto end; |
| 913 | } |
| 914 | |
| 915 | /* We receive the initial list of streams. */ |
| 916 | status = receive_streams(session, streams_count, self_msg_iter); |
| 917 | switch (status) { |
| 918 | case LTTNG_LIVE_VIEWER_STATUS_OK: |
| 919 | break; |
| 920 | case LTTNG_LIVE_VIEWER_STATUS_INTERRUPTED: |
| 921 | goto end; |
| 922 | case LTTNG_LIVE_VIEWER_STATUS_ERROR: |
| 923 | BT_CPPLOGE_APPEND_CAUSE_SPEC(viewer_connection->logger, "Error receiving streams"); |
| 924 | goto end; |
| 925 | default: |
| 926 | bt_common_abort(); |
| 927 | } |
| 928 | |
| 929 | session->attached = true; |
| 930 | session->new_streams_needed = false; |
| 931 | |
| 932 | end: |
| 933 | return status; |
| 934 | } |
| 935 | |
| 936 | enum lttng_live_viewer_status lttng_live_session_detach(struct lttng_live_session *session) |
| 937 | { |
| 938 | struct lttng_viewer_cmd cmd; |
| 939 | enum lttng_live_viewer_status status; |
| 940 | struct lttng_viewer_detach_session_request rq; |
| 941 | struct lttng_viewer_detach_session_response rp; |
| 942 | struct lttng_live_msg_iter *lttng_live_msg_iter = session->lttng_live_msg_iter; |
| 943 | live_viewer_connection *viewer_connection = lttng_live_msg_iter->viewer_connection.get(); |
| 944 | uint64_t session_id = session->id; |
| 945 | const size_t cmd_buf_len = sizeof(cmd) + sizeof(rq); |
| 946 | char cmd_buf[cmd_buf_len]; |
| 947 | |
| 948 | /* |
| 949 | * The session might already be detached and the viewer socket might |
| 950 | * already been closed. This happens when calling this function when |
| 951 | * tearing down the graph after an error. |
| 952 | */ |
| 953 | if (!session->attached || viewer_connection->control_sock == BT_INVALID_SOCKET) { |
| 954 | return LTTNG_LIVE_VIEWER_STATUS_OK; |
| 955 | } |
| 956 | |
| 957 | BT_CPPLOGD_SPEC(viewer_connection->logger, "Detaching from session: cmd={}, session-id={}", |
| 958 | LTTNG_VIEWER_DETACH_SESSION, session_id); |
| 959 | |
| 960 | cmd.cmd = htobe32(LTTNG_VIEWER_DETACH_SESSION); |
| 961 | cmd.data_size = htobe64((uint64_t) sizeof(rq)); |
| 962 | cmd.cmd_version = htobe32(0); |
| 963 | |
| 964 | memset(&rq, 0, sizeof(rq)); |
| 965 | rq.session_id = htobe64(session_id); |
| 966 | |
| 967 | /* |
| 968 | * Merge the cmd and connection request to prevent a write-write |
| 969 | * sequence on the TCP socket. Otherwise, a delayed ACK will prevent the |
| 970 | * second write to be performed quickly in presence of Nagle's algorithm. |
| 971 | */ |
| 972 | memcpy(cmd_buf, &cmd, sizeof(cmd)); |
| 973 | memcpy(cmd_buf + sizeof(cmd), &rq, sizeof(rq)); |
| 974 | status = lttng_live_send(viewer_connection, &cmd_buf, cmd_buf_len); |
| 975 | if (status != LTTNG_LIVE_VIEWER_STATUS_OK) { |
| 976 | viewer_handle_send_status(status, "detach session command"); |
| 977 | goto end; |
| 978 | } |
| 979 | |
| 980 | status = lttng_live_recv(viewer_connection, &rp, sizeof(rp)); |
| 981 | if (status != LTTNG_LIVE_VIEWER_STATUS_OK) { |
| 982 | viewer_handle_recv_status(status, "detach session reply"); |
| 983 | goto end; |
| 984 | } |
| 985 | |
| 986 | switch (be32toh(rp.status)) { |
| 987 | case LTTNG_VIEWER_DETACH_SESSION_OK: |
| 988 | break; |
| 989 | case LTTNG_VIEWER_DETACH_SESSION_UNK: |
| 990 | BT_CPPLOGW_SPEC(viewer_connection->logger, "Session id {} is unknown", session_id); |
| 991 | status = LTTNG_LIVE_VIEWER_STATUS_ERROR; |
| 992 | goto end; |
| 993 | case LTTNG_VIEWER_DETACH_SESSION_ERR: |
| 994 | BT_CPPLOGW_SPEC(viewer_connection->logger, "Error detaching session id {}", session_id); |
| 995 | status = LTTNG_LIVE_VIEWER_STATUS_ERROR; |
| 996 | goto end; |
| 997 | default: |
| 998 | BT_CPPLOGE_SPEC(viewer_connection->logger, "Unknown detach return code {}", |
| 999 | be32toh(rp.status)); |
| 1000 | status = LTTNG_LIVE_VIEWER_STATUS_ERROR; |
| 1001 | goto end; |
| 1002 | } |
| 1003 | |
| 1004 | session->attached = false; |
| 1005 | |
| 1006 | status = LTTNG_LIVE_VIEWER_STATUS_OK; |
| 1007 | |
| 1008 | end: |
| 1009 | return status; |
| 1010 | } |
| 1011 | |
| 1012 | enum lttng_live_get_one_metadata_status |
| 1013 | lttng_live_get_one_metadata_packet(struct lttng_live_trace *trace, std::vector<char>& buf) |
| 1014 | { |
| 1015 | uint64_t len = 0; |
| 1016 | enum lttng_live_get_one_metadata_status status; |
| 1017 | enum lttng_live_viewer_status viewer_status; |
| 1018 | struct lttng_viewer_cmd cmd; |
| 1019 | struct lttng_viewer_get_metadata rq; |
| 1020 | struct lttng_viewer_metadata_packet rp; |
| 1021 | std::vector<char> data; |
| 1022 | struct lttng_live_session *session = trace->session; |
| 1023 | struct lttng_live_msg_iter *lttng_live_msg_iter = session->lttng_live_msg_iter; |
| 1024 | struct lttng_live_metadata *metadata = trace->metadata.get(); |
| 1025 | live_viewer_connection *viewer_connection = lttng_live_msg_iter->viewer_connection.get(); |
| 1026 | const size_t cmd_buf_len = sizeof(cmd) + sizeof(rq); |
| 1027 | char cmd_buf[cmd_buf_len]; |
| 1028 | |
| 1029 | BT_CPPLOGD_SPEC(viewer_connection->logger, |
| 1030 | "Requesting new metadata for trace:" |
| 1031 | "cmd={}, trace-id={}, metadata-stream-id={}", |
| 1032 | LTTNG_VIEWER_GET_METADATA, trace->id, metadata->stream_id); |
| 1033 | |
| 1034 | rq.stream_id = htobe64(metadata->stream_id); |
| 1035 | cmd.cmd = htobe32(LTTNG_VIEWER_GET_METADATA); |
| 1036 | cmd.data_size = htobe64((uint64_t) sizeof(rq)); |
| 1037 | cmd.cmd_version = htobe32(0); |
| 1038 | |
| 1039 | /* |
| 1040 | * Merge the cmd and connection request to prevent a write-write |
| 1041 | * sequence on the TCP socket. Otherwise, a delayed ACK will prevent the |
| 1042 | * second write to be performed quickly in presence of Nagle's algorithm. |
| 1043 | */ |
| 1044 | memcpy(cmd_buf, &cmd, sizeof(cmd)); |
| 1045 | memcpy(cmd_buf + sizeof(cmd), &rq, sizeof(rq)); |
| 1046 | viewer_status = lttng_live_send(viewer_connection, &cmd_buf, cmd_buf_len); |
| 1047 | if (viewer_status != LTTNG_LIVE_VIEWER_STATUS_OK) { |
| 1048 | viewer_handle_send_status(viewer_status, "get metadata command"); |
| 1049 | status = (enum lttng_live_get_one_metadata_status) viewer_status; |
| 1050 | goto end; |
| 1051 | } |
| 1052 | |
| 1053 | viewer_status = lttng_live_recv(viewer_connection, &rp, sizeof(rp)); |
| 1054 | if (viewer_status != LTTNG_LIVE_VIEWER_STATUS_OK) { |
| 1055 | viewer_handle_recv_status(viewer_status, "get metadata reply"); |
| 1056 | status = (enum lttng_live_get_one_metadata_status) viewer_status; |
| 1057 | goto end; |
| 1058 | } |
| 1059 | |
| 1060 | switch (be32toh(rp.status)) { |
| 1061 | case LTTNG_VIEWER_METADATA_OK: |
| 1062 | BT_CPPLOGD_SPEC(viewer_connection->logger, "Received get_metadata response: ok"); |
| 1063 | break; |
| 1064 | case LTTNG_VIEWER_NO_NEW_METADATA: |
| 1065 | BT_CPPLOGD_SPEC(viewer_connection->logger, "Received get_metadata response: no new"); |
| 1066 | status = LTTNG_LIVE_GET_ONE_METADATA_STATUS_END; |
| 1067 | goto end; |
| 1068 | case LTTNG_VIEWER_METADATA_ERR: |
| 1069 | /* |
| 1070 | * The Relayd cannot find this stream id. Maybe its |
| 1071 | * gone already. This can happen in short lived UST app |
| 1072 | * in a per-pid session. |
| 1073 | */ |
| 1074 | BT_CPPLOGD_SPEC(viewer_connection->logger, "Received get_metadata response: error"); |
| 1075 | status = LTTNG_LIVE_GET_ONE_METADATA_STATUS_CLOSED; |
| 1076 | goto end; |
| 1077 | default: |
| 1078 | BT_CPPLOGE_APPEND_CAUSE_SPEC(viewer_connection->logger, |
| 1079 | "Received get_metadata response: unknown"); |
| 1080 | status = LTTNG_LIVE_GET_ONE_METADATA_STATUS_ERROR; |
| 1081 | goto end; |
| 1082 | } |
| 1083 | |
| 1084 | len = be64toh(rp.len); |
| 1085 | if (len == 0) { |
| 1086 | /* |
| 1087 | * We received a `LTTNG_VIEWER_METADATA_OK` with a packet |
| 1088 | * length of 0. This means we must try again. This scenario |
| 1089 | * arises when a clear command is performed on an lttng session. |
| 1090 | */ |
| 1091 | BT_CPPLOGD_SPEC( |
| 1092 | viewer_connection->logger, |
| 1093 | "Expecting a metadata packet of size 0. Retry to get a packet from the relay."); |
| 1094 | goto empty_metadata_packet_retry; |
| 1095 | } |
| 1096 | |
| 1097 | BT_CPPLOGD_SPEC(viewer_connection->logger, "Writing {} bytes to metadata", len); |
| 1098 | if (len <= 0) { |
| 1099 | BT_CPPLOGE_APPEND_CAUSE_SPEC(viewer_connection->logger, "Erroneous response length"); |
| 1100 | status = LTTNG_LIVE_GET_ONE_METADATA_STATUS_ERROR; |
| 1101 | goto end; |
| 1102 | } |
| 1103 | |
| 1104 | data.resize(len); |
| 1105 | |
| 1106 | viewer_status = lttng_live_recv(viewer_connection, data.data(), len); |
| 1107 | if (viewer_status != LTTNG_LIVE_VIEWER_STATUS_OK) { |
| 1108 | viewer_handle_recv_status(viewer_status, "get metadata packet"); |
| 1109 | status = (enum lttng_live_get_one_metadata_status) viewer_status; |
| 1110 | goto end; |
| 1111 | } |
| 1112 | |
| 1113 | /* |
| 1114 | * Write the metadata to the file handle. |
| 1115 | */ |
| 1116 | buf.insert(buf.end(), data.begin(), data.end()); |
| 1117 | |
| 1118 | empty_metadata_packet_retry: |
| 1119 | status = LTTNG_LIVE_GET_ONE_METADATA_STATUS_OK; |
| 1120 | |
| 1121 | end: |
| 1122 | return status; |
| 1123 | } |
| 1124 | |
| 1125 | /* |
| 1126 | * Assign the fields from a lttng_viewer_index to a packet_index. |
| 1127 | */ |
| 1128 | static void lttng_index_to_packet_index(struct lttng_viewer_index *lindex, |
| 1129 | struct packet_index *pindex) |
| 1130 | { |
| 1131 | BT_ASSERT(lindex); |
| 1132 | BT_ASSERT(pindex); |
| 1133 | |
| 1134 | pindex->offset = be64toh(lindex->offset); |
| 1135 | pindex->packet_size = be64toh(lindex->packet_size); |
| 1136 | pindex->content_size = be64toh(lindex->content_size); |
| 1137 | pindex->ts_cycles.timestamp_begin = be64toh(lindex->timestamp_begin); |
| 1138 | pindex->ts_cycles.timestamp_end = be64toh(lindex->timestamp_end); |
| 1139 | pindex->events_discarded = be64toh(lindex->events_discarded); |
| 1140 | } |
| 1141 | |
| 1142 | static void lttng_live_need_new_streams(struct lttng_live_msg_iter *lttng_live_msg_iter) |
| 1143 | { |
| 1144 | for (const auto& session : lttng_live_msg_iter->sessions) { |
| 1145 | BT_CPPLOGD_SPEC(lttng_live_msg_iter->logger, |
| 1146 | "Marking session as needing new streams: " |
| 1147 | "session-id={}", |
| 1148 | session->id); |
| 1149 | session->new_streams_needed = true; |
| 1150 | } |
| 1151 | } |
| 1152 | |
| 1153 | enum lttng_live_iterator_status |
| 1154 | lttng_live_get_next_index(struct lttng_live_msg_iter *lttng_live_msg_iter, |
| 1155 | struct lttng_live_stream_iterator *stream, struct packet_index *index) |
| 1156 | { |
| 1157 | struct lttng_viewer_cmd cmd; |
| 1158 | struct lttng_viewer_get_next_index rq; |
| 1159 | enum lttng_live_viewer_status viewer_status; |
| 1160 | struct lttng_viewer_index rp; |
| 1161 | enum lttng_live_iterator_status status; |
| 1162 | live_viewer_connection *viewer_connection = lttng_live_msg_iter->viewer_connection.get(); |
| 1163 | struct lttng_live_trace *trace = stream->trace; |
| 1164 | const size_t cmd_buf_len = sizeof(cmd) + sizeof(rq); |
| 1165 | char cmd_buf[cmd_buf_len]; |
| 1166 | uint32_t flags, rp_status; |
| 1167 | |
| 1168 | BT_CPPLOGD_SPEC(viewer_connection->logger, |
| 1169 | "Requesting next index for stream: cmd={}, " |
| 1170 | "viewer-stream-id={}", |
| 1171 | LTTNG_VIEWER_GET_NEXT_INDEX, stream->viewer_stream_id); |
| 1172 | cmd.cmd = htobe32(LTTNG_VIEWER_GET_NEXT_INDEX); |
| 1173 | cmd.data_size = htobe64((uint64_t) sizeof(rq)); |
| 1174 | cmd.cmd_version = htobe32(0); |
| 1175 | |
| 1176 | memset(&rq, 0, sizeof(rq)); |
| 1177 | rq.stream_id = htobe64(stream->viewer_stream_id); |
| 1178 | |
| 1179 | /* |
| 1180 | * Merge the cmd and connection request to prevent a write-write |
| 1181 | * sequence on the TCP socket. Otherwise, a delayed ACK will prevent the |
| 1182 | * second write to be performed quickly in presence of Nagle's algorithm. |
| 1183 | */ |
| 1184 | memcpy(cmd_buf, &cmd, sizeof(cmd)); |
| 1185 | memcpy(cmd_buf + sizeof(cmd), &rq, sizeof(rq)); |
| 1186 | |
| 1187 | viewer_status = lttng_live_send(viewer_connection, &cmd_buf, cmd_buf_len); |
| 1188 | if (viewer_status != LTTNG_LIVE_VIEWER_STATUS_OK) { |
| 1189 | viewer_handle_send_status(viewer_status, "get next index command"); |
| 1190 | goto error; |
| 1191 | } |
| 1192 | |
| 1193 | viewer_status = lttng_live_recv(viewer_connection, &rp, sizeof(rp)); |
| 1194 | if (viewer_status != LTTNG_LIVE_VIEWER_STATUS_OK) { |
| 1195 | viewer_handle_recv_status(viewer_status, "get next index reply"); |
| 1196 | goto error; |
| 1197 | } |
| 1198 | |
| 1199 | flags = be32toh(rp.flags); |
| 1200 | rp_status = be32toh(rp.status); |
| 1201 | |
| 1202 | BT_CPPLOGD_SPEC( |
| 1203 | viewer_connection->logger, "Received response from relay daemon: cmd=%s, response={}", |
| 1204 | LTTNG_VIEWER_GET_NEXT_INDEX, static_cast<lttng_viewer_next_index_return_code>(rp_status)); |
| 1205 | |
| 1206 | if (flags & LTTNG_VIEWER_FLAG_NEW_STREAM) { |
| 1207 | BT_CPPLOGD_SPEC(viewer_connection->logger, |
| 1208 | "Marking all sessions as possibly needing new streams: " |
| 1209 | "response={}, response-flag=NEW_STREAM", |
| 1210 | static_cast<lttng_viewer_next_index_return_code>(rp_status)); |
| 1211 | lttng_live_need_new_streams(lttng_live_msg_iter); |
| 1212 | } |
| 1213 | |
| 1214 | switch (rp_status) { |
| 1215 | case LTTNG_VIEWER_INDEX_INACTIVE: |
| 1216 | { |
| 1217 | uint64_t ctf_stream_class_id; |
| 1218 | |
| 1219 | memset(index, 0, sizeof(struct packet_index)); |
| 1220 | index->ts_cycles.timestamp_end = be64toh(rp.timestamp_end); |
| 1221 | stream->current_inactivity_ts = index->ts_cycles.timestamp_end; |
| 1222 | ctf_stream_class_id = be64toh(rp.stream_id); |
| 1223 | if (stream->ctf_stream_class_id.is_set) { |
| 1224 | BT_ASSERT(stream->ctf_stream_class_id.value == ctf_stream_class_id); |
| 1225 | } else { |
| 1226 | stream->ctf_stream_class_id.value = ctf_stream_class_id; |
| 1227 | stream->ctf_stream_class_id.is_set = true; |
| 1228 | } |
| 1229 | lttng_live_stream_iterator_set_state(stream, LTTNG_LIVE_STREAM_QUIESCENT); |
| 1230 | status = LTTNG_LIVE_ITERATOR_STATUS_OK; |
| 1231 | break; |
| 1232 | } |
| 1233 | case LTTNG_VIEWER_INDEX_OK: |
| 1234 | { |
| 1235 | uint64_t ctf_stream_class_id; |
| 1236 | |
| 1237 | lttng_index_to_packet_index(&rp, index); |
| 1238 | ctf_stream_class_id = be64toh(rp.stream_id); |
| 1239 | if (stream->ctf_stream_class_id.is_set) { |
| 1240 | BT_ASSERT(stream->ctf_stream_class_id.value == ctf_stream_class_id); |
| 1241 | } else { |
| 1242 | stream->ctf_stream_class_id.value = ctf_stream_class_id; |
| 1243 | stream->ctf_stream_class_id.is_set = true; |
| 1244 | } |
| 1245 | lttng_live_stream_iterator_set_state(stream, LTTNG_LIVE_STREAM_ACTIVE_DATA); |
| 1246 | |
| 1247 | if (flags & LTTNG_VIEWER_FLAG_NEW_METADATA) { |
| 1248 | BT_CPPLOGD_SPEC(viewer_connection->logger, |
| 1249 | "Marking trace as needing new metadata: " |
| 1250 | "response={}, response-flag=NEW_METADATA, trace-id={}", |
| 1251 | static_cast<lttng_viewer_next_index_return_code>(rp_status), trace->id); |
| 1252 | trace->metadata_stream_state = LTTNG_LIVE_METADATA_STREAM_STATE_NEEDED; |
| 1253 | } |
| 1254 | status = LTTNG_LIVE_ITERATOR_STATUS_OK; |
| 1255 | break; |
| 1256 | } |
| 1257 | case LTTNG_VIEWER_INDEX_RETRY: |
| 1258 | memset(index, 0, sizeof(struct packet_index)); |
| 1259 | lttng_live_stream_iterator_set_state(stream, LTTNG_LIVE_STREAM_ACTIVE_NO_DATA); |
| 1260 | status = LTTNG_LIVE_ITERATOR_STATUS_AGAIN; |
| 1261 | goto end; |
| 1262 | case LTTNG_VIEWER_INDEX_HUP: |
| 1263 | memset(index, 0, sizeof(struct packet_index)); |
| 1264 | index->offset = EOF; |
| 1265 | lttng_live_stream_iterator_set_state(stream, LTTNG_LIVE_STREAM_EOF); |
| 1266 | stream->has_stream_hung_up = true; |
| 1267 | status = LTTNG_LIVE_ITERATOR_STATUS_END; |
| 1268 | break; |
| 1269 | case LTTNG_VIEWER_INDEX_ERR: |
| 1270 | memset(index, 0, sizeof(struct packet_index)); |
| 1271 | lttng_live_stream_iterator_set_state(stream, LTTNG_LIVE_STREAM_ACTIVE_NO_DATA); |
| 1272 | status = LTTNG_LIVE_ITERATOR_STATUS_ERROR; |
| 1273 | goto end; |
| 1274 | default: |
| 1275 | BT_CPPLOGD_SPEC(viewer_connection->logger, |
| 1276 | "Received get_next_index response: unknown value"); |
| 1277 | memset(index, 0, sizeof(struct packet_index)); |
| 1278 | lttng_live_stream_iterator_set_state(stream, LTTNG_LIVE_STREAM_ACTIVE_NO_DATA); |
| 1279 | status = LTTNG_LIVE_ITERATOR_STATUS_ERROR; |
| 1280 | goto end; |
| 1281 | } |
| 1282 | |
| 1283 | goto end; |
| 1284 | |
| 1285 | error: |
| 1286 | status = viewer_status_to_live_iterator_status(viewer_status); |
| 1287 | end: |
| 1288 | return status; |
| 1289 | } |
| 1290 | |
| 1291 | enum ctf_msg_iter_medium_status |
| 1292 | lttng_live_get_stream_bytes(struct lttng_live_msg_iter *lttng_live_msg_iter, |
| 1293 | struct lttng_live_stream_iterator *stream, uint8_t *buf, |
| 1294 | uint64_t offset, uint64_t req_len, uint64_t *recv_len) |
| 1295 | { |
| 1296 | enum ctf_msg_iter_medium_status status; |
| 1297 | enum lttng_live_viewer_status viewer_status; |
| 1298 | struct lttng_viewer_trace_packet rp; |
| 1299 | struct lttng_viewer_cmd cmd; |
| 1300 | struct lttng_viewer_get_packet rq; |
| 1301 | live_viewer_connection *viewer_connection = lttng_live_msg_iter->viewer_connection.get(); |
| 1302 | struct lttng_live_trace *trace = stream->trace; |
| 1303 | const size_t cmd_buf_len = sizeof(cmd) + sizeof(rq); |
| 1304 | char cmd_buf[cmd_buf_len]; |
| 1305 | uint32_t flags, rp_status; |
| 1306 | |
| 1307 | BT_CPPLOGD_SPEC(viewer_connection->logger, |
| 1308 | "Requesting data from stream: cmd={}, " |
| 1309 | "offset={}, request-len={}", |
| 1310 | LTTNG_VIEWER_GET_PACKET, offset, req_len); |
| 1311 | |
| 1312 | cmd.cmd = htobe32(LTTNG_VIEWER_GET_PACKET); |
| 1313 | cmd.data_size = htobe64((uint64_t) sizeof(rq)); |
| 1314 | cmd.cmd_version = htobe32(0); |
| 1315 | |
| 1316 | memset(&rq, 0, sizeof(rq)); |
| 1317 | rq.stream_id = htobe64(stream->viewer_stream_id); |
| 1318 | rq.offset = htobe64(offset); |
| 1319 | rq.len = htobe32(req_len); |
| 1320 | |
| 1321 | /* |
| 1322 | * Merge the cmd and connection request to prevent a write-write |
| 1323 | * sequence on the TCP socket. Otherwise, a delayed ACK will prevent the |
| 1324 | * second write to be performed quickly in presence of Nagle's algorithm. |
| 1325 | */ |
| 1326 | memcpy(cmd_buf, &cmd, sizeof(cmd)); |
| 1327 | memcpy(cmd_buf + sizeof(cmd), &rq, sizeof(rq)); |
| 1328 | |
| 1329 | viewer_status = lttng_live_send(viewer_connection, &cmd_buf, cmd_buf_len); |
| 1330 | if (viewer_status != LTTNG_LIVE_VIEWER_STATUS_OK) { |
| 1331 | viewer_handle_send_status(viewer_status, "get data packet command"); |
| 1332 | goto error_convert_status; |
| 1333 | } |
| 1334 | |
| 1335 | viewer_status = lttng_live_recv(viewer_connection, &rp, sizeof(rp)); |
| 1336 | if (viewer_status != LTTNG_LIVE_VIEWER_STATUS_OK) { |
| 1337 | viewer_handle_recv_status(viewer_status, "get data packet reply"); |
| 1338 | goto error_convert_status; |
| 1339 | } |
| 1340 | |
| 1341 | flags = be32toh(rp.flags); |
| 1342 | rp_status = be32toh(rp.status); |
| 1343 | |
| 1344 | BT_CPPLOGD_SPEC( |
| 1345 | viewer_connection->logger, "Received response from relay daemon: cmd={}, response={}", |
| 1346 | LTTNG_VIEWER_GET_PACKET, static_cast<lttng_viewer_get_packet_return_code>(rp_status)); |
| 1347 | switch (rp_status) { |
| 1348 | case LTTNG_VIEWER_GET_PACKET_OK: |
| 1349 | req_len = be32toh(rp.len); |
| 1350 | BT_CPPLOGD_SPEC(viewer_connection->logger, |
| 1351 | "Got packet from relay daemon: response={}, packet-len={}", |
| 1352 | static_cast<lttng_viewer_get_packet_return_code>(rp_status), req_len); |
| 1353 | break; |
| 1354 | case LTTNG_VIEWER_GET_PACKET_RETRY: |
| 1355 | /* Unimplemented by relay daemon */ |
| 1356 | status = CTF_MSG_ITER_MEDIUM_STATUS_AGAIN; |
| 1357 | goto end; |
| 1358 | case LTTNG_VIEWER_GET_PACKET_ERR: |
| 1359 | if (flags & LTTNG_VIEWER_FLAG_NEW_METADATA) { |
| 1360 | BT_CPPLOGD_SPEC(viewer_connection->logger, |
| 1361 | "Marking trace as needing new metadata: " |
| 1362 | "response={}, response-flag=NEW_METADATA, trace-id={}", |
| 1363 | static_cast<lttng_viewer_get_packet_return_code>(rp_status), trace->id); |
| 1364 | trace->metadata_stream_state = LTTNG_LIVE_METADATA_STREAM_STATE_NEEDED; |
| 1365 | } |
| 1366 | if (flags & LTTNG_VIEWER_FLAG_NEW_STREAM) { |
| 1367 | BT_CPPLOGD_SPEC(viewer_connection->logger, |
| 1368 | "Marking all sessions as possibly needing new streams: " |
| 1369 | "response={}, response-flag=NEW_STREAM", |
| 1370 | static_cast<lttng_viewer_get_packet_return_code>(rp_status)); |
| 1371 | lttng_live_need_new_streams(lttng_live_msg_iter); |
| 1372 | } |
| 1373 | if (flags & (LTTNG_VIEWER_FLAG_NEW_METADATA | LTTNG_VIEWER_FLAG_NEW_STREAM)) { |
| 1374 | status = CTF_MSG_ITER_MEDIUM_STATUS_AGAIN; |
| 1375 | BT_CPPLOGD_SPEC(viewer_connection->logger, |
| 1376 | "Reply with any one flags set means we should retry: response={}", |
| 1377 | static_cast<lttng_viewer_get_packet_return_code>(rp_status)); |
| 1378 | goto end; |
| 1379 | } |
| 1380 | BT_CPPLOGE_APPEND_CAUSE_SPEC(viewer_connection->logger, |
| 1381 | "Received get_data_packet response: error"); |
| 1382 | status = CTF_MSG_ITER_MEDIUM_STATUS_ERROR; |
| 1383 | goto end; |
| 1384 | case LTTNG_VIEWER_GET_PACKET_EOF: |
| 1385 | status = CTF_MSG_ITER_MEDIUM_STATUS_EOF; |
| 1386 | goto end; |
| 1387 | default: |
| 1388 | BT_CPPLOGE_APPEND_CAUSE_SPEC(viewer_connection->logger, |
| 1389 | "Received get_data_packet response: unknown ({})", rp_status); |
| 1390 | status = CTF_MSG_ITER_MEDIUM_STATUS_ERROR; |
| 1391 | goto end; |
| 1392 | } |
| 1393 | |
| 1394 | if (req_len == 0) { |
| 1395 | status = CTF_MSG_ITER_MEDIUM_STATUS_ERROR; |
| 1396 | goto end; |
| 1397 | } |
| 1398 | |
| 1399 | viewer_status = lttng_live_recv(viewer_connection, buf, req_len); |
| 1400 | if (viewer_status != LTTNG_LIVE_VIEWER_STATUS_OK) { |
| 1401 | viewer_handle_recv_status(viewer_status, "get data packet"); |
| 1402 | goto error_convert_status; |
| 1403 | } |
| 1404 | *recv_len = req_len; |
| 1405 | |
| 1406 | status = CTF_MSG_ITER_MEDIUM_STATUS_OK; |
| 1407 | goto end; |
| 1408 | |
| 1409 | error_convert_status: |
| 1410 | status = viewer_status_to_ctf_msg_iter_medium_status(viewer_status); |
| 1411 | end: |
| 1412 | return status; |
| 1413 | } |
| 1414 | |
| 1415 | /* |
| 1416 | * Request new streams for a session. |
| 1417 | */ |
| 1418 | enum lttng_live_iterator_status |
| 1419 | lttng_live_session_get_new_streams(struct lttng_live_session *session, |
| 1420 | bt_self_message_iterator *self_msg_iter) |
| 1421 | { |
| 1422 | enum lttng_live_iterator_status status = LTTNG_LIVE_ITERATOR_STATUS_OK; |
| 1423 | struct lttng_viewer_cmd cmd; |
| 1424 | struct lttng_viewer_new_streams_request rq; |
| 1425 | struct lttng_viewer_new_streams_response rp; |
| 1426 | struct lttng_live_msg_iter *lttng_live_msg_iter = session->lttng_live_msg_iter; |
| 1427 | enum lttng_live_viewer_status viewer_status; |
| 1428 | live_viewer_connection *viewer_connection = lttng_live_msg_iter->viewer_connection.get(); |
| 1429 | uint32_t streams_count; |
| 1430 | const size_t cmd_buf_len = sizeof(cmd) + sizeof(rq); |
| 1431 | char cmd_buf[cmd_buf_len]; |
| 1432 | |
| 1433 | if (!session->new_streams_needed) { |
| 1434 | status = LTTNG_LIVE_ITERATOR_STATUS_OK; |
| 1435 | goto end; |
| 1436 | } |
| 1437 | |
| 1438 | BT_CPPLOGD_SPEC(viewer_connection->logger, |
| 1439 | "Requesting new streams for session: cmd={}, session-id={}", |
| 1440 | LTTNG_VIEWER_GET_NEW_STREAMS, session->id); |
| 1441 | |
| 1442 | cmd.cmd = htobe32(LTTNG_VIEWER_GET_NEW_STREAMS); |
| 1443 | cmd.data_size = htobe64((uint64_t) sizeof(rq)); |
| 1444 | cmd.cmd_version = htobe32(0); |
| 1445 | |
| 1446 | memset(&rq, 0, sizeof(rq)); |
| 1447 | rq.session_id = htobe64(session->id); |
| 1448 | |
| 1449 | /* |
| 1450 | * Merge the cmd and connection request to prevent a write-write |
| 1451 | * sequence on the TCP socket. Otherwise, a delayed ACK will prevent the |
| 1452 | * second write to be performed quickly in presence of Nagle's algorithm. |
| 1453 | */ |
| 1454 | memcpy(cmd_buf, &cmd, sizeof(cmd)); |
| 1455 | memcpy(cmd_buf + sizeof(cmd), &rq, sizeof(rq)); |
| 1456 | |
| 1457 | viewer_status = lttng_live_send(viewer_connection, &cmd_buf, cmd_buf_len); |
| 1458 | if (viewer_status != LTTNG_LIVE_VIEWER_STATUS_OK) { |
| 1459 | viewer_handle_send_status(viewer_status, "get new streams command"); |
| 1460 | status = viewer_status_to_live_iterator_status(viewer_status); |
| 1461 | goto end; |
| 1462 | } |
| 1463 | |
| 1464 | viewer_status = lttng_live_recv(viewer_connection, &rp, sizeof(rp)); |
| 1465 | if (viewer_status != LTTNG_LIVE_VIEWER_STATUS_OK) { |
| 1466 | viewer_handle_recv_status(viewer_status, "get new streams reply"); |
| 1467 | status = viewer_status_to_live_iterator_status(viewer_status); |
| 1468 | goto end; |
| 1469 | } |
| 1470 | |
| 1471 | streams_count = be32toh(rp.streams_count); |
| 1472 | |
| 1473 | switch (be32toh(rp.status)) { |
| 1474 | case LTTNG_VIEWER_NEW_STREAMS_OK: |
| 1475 | session->new_streams_needed = false; |
| 1476 | break; |
| 1477 | case LTTNG_VIEWER_NEW_STREAMS_NO_NEW: |
| 1478 | session->new_streams_needed = false; |
| 1479 | goto end; |
| 1480 | case LTTNG_VIEWER_NEW_STREAMS_HUP: |
| 1481 | session->new_streams_needed = false; |
| 1482 | session->closed = true; |
| 1483 | status = LTTNG_LIVE_ITERATOR_STATUS_END; |
| 1484 | goto end; |
| 1485 | case LTTNG_VIEWER_NEW_STREAMS_ERR: |
| 1486 | BT_CPPLOGD_SPEC(viewer_connection->logger, "Received get_new_streams response: error"); |
| 1487 | status = LTTNG_LIVE_ITERATOR_STATUS_ERROR; |
| 1488 | goto end; |
| 1489 | default: |
| 1490 | BT_CPPLOGE_APPEND_CAUSE_SPEC(viewer_connection->logger, |
| 1491 | "Received get_new_streams response: Unknown:" |
| 1492 | "return code {}", |
| 1493 | be32toh(rp.status)); |
| 1494 | status = LTTNG_LIVE_ITERATOR_STATUS_ERROR; |
| 1495 | goto end; |
| 1496 | } |
| 1497 | |
| 1498 | viewer_status = receive_streams(session, streams_count, self_msg_iter); |
| 1499 | if (viewer_status != LTTNG_LIVE_VIEWER_STATUS_OK) { |
| 1500 | viewer_handle_recv_status(viewer_status, "new streams"); |
| 1501 | status = viewer_status_to_live_iterator_status(viewer_status); |
| 1502 | goto end; |
| 1503 | } |
| 1504 | |
| 1505 | status = LTTNG_LIVE_ITERATOR_STATUS_OK; |
| 1506 | end: |
| 1507 | return status; |
| 1508 | } |
| 1509 | |
| 1510 | enum lttng_live_viewer_status |
| 1511 | live_viewer_connection_create(const char *url, bool in_query, |
| 1512 | struct lttng_live_msg_iter *lttng_live_msg_iter, |
| 1513 | const bt2c::Logger& parentLogger, live_viewer_connection::UP& viewer) |
| 1514 | { |
| 1515 | auto viewer_connection = bt2s::make_unique<live_viewer_connection>(parentLogger); |
| 1516 | |
| 1517 | if (bt_socket_init(viewer_connection->logger) != 0) { |
| 1518 | BT_CPPLOGE_APPEND_CAUSE_SPEC(viewer_connection->logger, "Failed to init socket"); |
| 1519 | return LTTNG_LIVE_VIEWER_STATUS_ERROR; |
| 1520 | } |
| 1521 | |
| 1522 | viewer_connection->control_sock = BT_INVALID_SOCKET; |
| 1523 | viewer_connection->port = -1; |
| 1524 | viewer_connection->in_query = in_query; |
| 1525 | viewer_connection->lttng_live_msg_iter = lttng_live_msg_iter; |
| 1526 | viewer_connection->url = url; |
| 1527 | |
| 1528 | BT_CPPLOGD_SPEC(viewer_connection->logger, "Establishing connection to url \"{}\"...", url); |
| 1529 | const auto status = lttng_live_connect_viewer(viewer_connection.get()); |
| 1530 | |
| 1531 | /* |
| 1532 | * Only print error and append cause in case of error. not in case of |
| 1533 | * interruption. |
| 1534 | */ |
| 1535 | if (status == LTTNG_LIVE_VIEWER_STATUS_ERROR) { |
| 1536 | BT_CPPLOGE_APPEND_CAUSE_SPEC(viewer_connection->logger, |
| 1537 | "Failed to establish connection: " |
| 1538 | "url=\"{}\"", |
| 1539 | url); |
| 1540 | return status; |
| 1541 | } else if (status == LTTNG_LIVE_VIEWER_STATUS_INTERRUPTED) { |
| 1542 | return status; |
| 1543 | } |
| 1544 | BT_CPPLOGD_SPEC(viewer_connection->logger, "Connection to url \"{}\" is established", url); |
| 1545 | |
| 1546 | viewer = std::move(viewer_connection); |
| 1547 | return LTTNG_LIVE_VIEWER_STATUS_OK; |
| 1548 | } |
| 1549 | |
| 1550 | live_viewer_connection::~live_viewer_connection() |
| 1551 | { |
| 1552 | BT_CPPLOGD_SPEC(this->logger, "Closing connection to relay: relay-url=\"{}\"", this->url); |
| 1553 | |
| 1554 | lttng_live_disconnect_viewer(this); |
| 1555 | |
| 1556 | bt_socket_fini(); |
| 1557 | } |