plugins/ctf/lttng-live/viewer-connection.c

   1 /*
   2  * Copyright 2016 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a copy
   5  * of this software and associated documentation files (the "Software"), to deal
   6  * in the Software without restriction, including without limitation the rights
   7  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   8  * copies of the Software, and to permit persons to whom the Software is
   9  * furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice shall be included in
  12  * all copies or substantial portions of the Software.
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  17  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  18  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  19  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  20  * SOFTWARE.
  21  */
  22
  23 #include <stdio.h>
  24 #include <stdint.h>
  25 #include <stdlib.h>
  26 #include <stdbool.h>
  27 #include <unistd.h>
  28 #include <glib.h>
  29 #include <inttypes.h>
  30 #include <sys/socket.h>
  31 #include <sys/types.h>
  32 #include <netinet/in.h>
  33 #include <netdb.h>
  34 #include <fcntl.h>
  35 #include <poll.h>
  36
  37 #include <babeltrace/compat/send-internal.h>
  38 #include <babeltrace/compiler-internal.h>
  39 #include <babeltrace/common-internal.h>
  40 #include <babeltrace/graph/graph.h>
  41
  42 #define BT_LOG_TAG "PLUGIN-CTF-LTTNG-LIVE-VIEWER"
  43
  44 #include "lttng-live-internal.h"
  45 #include "viewer-connection.h"
  46 #include "lttng-viewer-abi.h"
  47 #include "data-stream.h"
  48 #include "metadata.h"
  49
  50 static ssize_t lttng_live_recv(struct bt_live_viewer_connection *viewer_connection,
  51                 void *buf, size_t len)
  52 {
  53         ssize_t ret;
  54         size_t copied = 0, to_copy = len;
  55         struct lttng_live_component *lttng_live =
  56                         viewer_connection->lttng_live;
  57         int fd = viewer_connection->control_sock;
  58
  59         do {
  60                 ret = recv(fd, buf + copied, to_copy, 0);
  61                 if (ret > 0) {
  62                         assert(ret <= to_copy);
  63                         copied += ret;
  64                         to_copy -= ret;
  65                 }
  66                 if (ret < 0 && errno == EINTR) {
  67                         if (lttng_live && bt_graph_is_canceled(lttng_live->graph)) {
  68                                 break;
  69                         } else {
  70                                 continue;
  71                         }
  72                 }
  73         } while (ret > 0 && to_copy > 0);
  74         if (ret > 0)
  75                 ret = copied;
  76         /* ret = 0 means orderly shutdown, ret < 0 is error. */
  77         return ret;
  78 }
  79
  80 static ssize_t lttng_live_send(struct bt_live_viewer_connection *viewer_connection,
  81                 const void *buf, size_t len)
  82 {
  83         struct lttng_live_component *lttng_live =
  84                         viewer_connection->lttng_live;
  85         int fd = viewer_connection->control_sock;
  86         ssize_t ret;
  87
  88         for (;;) {
  89                 ret = bt_send_nosigpipe(fd, buf, len);
  90                 if (ret < 0 && errno == EINTR) {
  91                         if (lttng_live && bt_graph_is_canceled(lttng_live->graph)) {
  92                                 break;
  93                         } else {
  94                                 continue;
  95                         }
  96                 } else {
  97                         break;
  98                 }
  99         }
 100         return ret;
 101 }
 102
 103 static int parse_url(struct bt_live_viewer_connection *viewer_connection)
 104 {
 105         char error_buf[256] = { 0 };
 106         struct bt_common_lttng_live_url_parts lttng_live_url_parts = { 0 };
 107         int ret = -1;
 108         const char *path = viewer_connection->url->str;
 109
 110         if (!path) {
 111                 goto end;
 112         }
 113
 114         lttng_live_url_parts = bt_common_parse_lttng_live_url(path,
 115                         error_buf, sizeof(error_buf));
 116         if (!lttng_live_url_parts.proto) {
 117                 BT_LOGW("Invalid LTTng live URL format: %s", error_buf);
 118                 goto end;
 119         }
 120
 121         viewer_connection->relay_hostname =
 122                         lttng_live_url_parts.hostname;
 123         lttng_live_url_parts.hostname = NULL;
 124
 125         if (lttng_live_url_parts.port >= 0) {
 126                 viewer_connection->port = lttng_live_url_parts.port;
 127         } else {
 128                 viewer_connection->port = LTTNG_DEFAULT_NETWORK_VIEWER_PORT;
 129         }
 130
 131         viewer_connection->target_hostname =
 132                         lttng_live_url_parts.target_hostname;
 133         lttng_live_url_parts.target_hostname = NULL;
 134
 135         if (lttng_live_url_parts.session_name) {
 136                 viewer_connection->session_name =
 137                                 lttng_live_url_parts.session_name;
 138                 lttng_live_url_parts.session_name = NULL;
 139         }
 140
 141         BT_LOGD("Connecting to hostname : %s, port : %d, "
 142                         "target hostname : %s, session name : %s, "
 143                         "proto : %s",
 144                         viewer_connection->relay_hostname->str,
 145                         viewer_connection->port,
 146                         viewer_connection->target_hostname == NULL ?
 147                                 "<none>" : viewer_connection->target_hostname->str,
 148                         viewer_connection->session_name == NULL ?
 149                                 "<none>" : viewer_connection->session_name->str,
 150                         lttng_live_url_parts.proto->str);
 151         ret = 0;
 152
 153 end:
 154         bt_common_destroy_lttng_live_url_parts(&lttng_live_url_parts);
 155         return ret;
 156 }
 157
 158 static int lttng_live_handshake(struct bt_live_viewer_connection *viewer_connection)
 159 {
 160         struct lttng_viewer_cmd cmd;
 161         struct lttng_viewer_connect connect;
 162         int ret;
 163         ssize_t ret_len;
 164
 165         cmd.cmd = htobe32(LTTNG_VIEWER_CONNECT);
 166         cmd.data_size = htobe64((uint64_t) sizeof(connect));
 167         cmd.cmd_version = htobe32(0);
 168
 169         connect.viewer_session_id = -1ULL;      /* will be set on recv */
 170         connect.major = htobe32(LTTNG_LIVE_MAJOR);
 171         connect.minor = htobe32(LTTNG_LIVE_MINOR);
 172         connect.type = htobe32(LTTNG_VIEWER_CLIENT_COMMAND);
 173
 174         ret_len = lttng_live_send(viewer_connection, &cmd, sizeof(cmd));
 175         if (ret_len < 0) {
 176                 BT_LOGE("Error sending cmd: %s", strerror(errno));
 177                 goto error;
 178         }
 179         assert(ret_len == sizeof(cmd));
 180
 181         ret_len = lttng_live_send(viewer_connection, &connect, sizeof(connect));
 182         if (ret_len < 0) {
 183                 BT_LOGE("Error sending version: %s", strerror(errno));
 184                 goto error;
 185         }
 186         assert(ret_len == sizeof(connect));
 187
 188         ret_len = lttng_live_recv(viewer_connection, &connect, sizeof(connect));
 189         if (ret_len == 0) {
 190                 BT_LOGI("Remote side has closed connection");
 191                 goto error;
 192         }
 193         if (ret_len < 0) {
 194                 BT_LOGE("Error receiving version: %s", strerror(errno));
 195                 goto error;
 196         }
 197         assert(ret_len == sizeof(connect));
 198
 199         BT_LOGD("Received viewer session ID : %" PRIu64,
 200                         be64toh(connect.viewer_session_id));
 201         BT_LOGD("Relayd version : %u.%u", be32toh(connect.major),
 202                         be32toh(connect.minor));
 203
 204         if (LTTNG_LIVE_MAJOR != be32toh(connect.major)) {
 205                 BT_LOGE("Incompatible lttng-relayd protocol");
 206                 goto error;
 207         }
 208         /* Use the smallest protocol version implemented. */
 209         if (LTTNG_LIVE_MINOR > be32toh(connect.minor)) {
 210                 viewer_connection->minor =  be32toh(connect.minor);
 211         } else {
 212                 viewer_connection->minor =  LTTNG_LIVE_MINOR;
 213         }
 214         viewer_connection->major = LTTNG_LIVE_MAJOR;
 215         ret = 0;
 216         return ret;
 217
 218 error:
 219         BT_LOGE("Unable to establish connection");
 220         return -1;
 221 }
 222
 223 static int lttng_live_connect_viewer(struct bt_live_viewer_connection *viewer_connection)
 224 {
 225         struct hostent *host;
 226         struct sockaddr_in server_addr;
 227         int ret;
 228
 229         if (parse_url(viewer_connection)) {
 230                 goto error;
 231         }
 232
 233         host = gethostbyname(viewer_connection->relay_hostname->str);
 234         if (!host) {
 235                 BT_LOGE("Cannot lookup hostname %s",
 236                         viewer_connection->relay_hostname->str);
 237                 goto error;
 238         }
 239
 240         if ((viewer_connection->control_sock = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
 241                 BT_LOGE("Socket creation failed: %s", strerror(errno));
 242                 goto error;
 243         }
 244
 245         server_addr.sin_family = AF_INET;
 246         server_addr.sin_port = htons(viewer_connection->port);
 247         server_addr.sin_addr = *((struct in_addr *) host->h_addr);
 248         memset(&(server_addr.sin_zero), 0, 8);
 249
 250         if (connect(viewer_connection->control_sock, (struct sockaddr *) &server_addr,
 251                                 sizeof(struct sockaddr)) == -1) {
 252                 BT_LOGE("Connection failed: %s", strerror(errno));
 253                 goto error;
 254         }
 255         if (lttng_live_handshake(viewer_connection)) {
 256                 goto error;
 257         }
 258
 259         ret = 0;
 260
 261         return ret;
 262
 263 error:
 264         if (viewer_connection->control_sock >= 0) {
 265                 if (close(viewer_connection->control_sock)) {
 266                         BT_LOGE("Close: %s", strerror(errno));
 267                 }
 268         }
 269         viewer_connection->control_sock = -1;
 270         return -1;
 271 }
 272
 273 static void lttng_live_disconnect_viewer(struct bt_live_viewer_connection *viewer_connection)
 274 {
 275         if (viewer_connection->control_sock < 0) {
 276                 return;
 277         }
 278         if (close(viewer_connection->control_sock)) {
 279                 BT_LOGE("Close: %s", strerror(errno));
 280                 viewer_connection->control_sock = -1;
 281         }
 282 }
 283
 284 static void connection_release(struct bt_object *obj)
 285 {
 286         struct bt_live_viewer_connection *conn =
 287                 container_of(obj, struct bt_live_viewer_connection, obj);
 288
 289         bt_live_viewer_connection_destroy(conn);
 290 }
 291
 292 static
 293 enum bt_value_status list_update_session(struct bt_value *results,
 294                 const struct lttng_viewer_session *session,
 295                 bool *_found)
 296 {
 297         enum bt_value_status ret = BT_VALUE_STATUS_OK;
 298         struct bt_value *map = NULL;
 299         struct bt_value *hostname = NULL;
 300         struct bt_value *session_name = NULL;
 301         struct bt_value *btval = NULL;
 302         int i, len;
 303         bool found = false;
 304
 305         len = bt_value_array_size(results);
 306         if (len < 0) {
 307                 ret = BT_VALUE_STATUS_ERROR;
 308                 goto end;
 309         }
 310         for (i = 0; i < len; i++) {
 311                 const char *hostname_str = NULL;
 312                 const char *session_name_str = NULL;
 313
 314                 map = bt_value_array_get(results, (size_t) i);
 315                 if (!map) {
 316                         ret = BT_VALUE_STATUS_ERROR;
 317                         goto end;
 318                 }
 319                 hostname = bt_value_map_get(map, "target-hostname");
 320                 if (!hostname) {
 321                         ret = BT_VALUE_STATUS_ERROR;
 322                         goto end;
 323                 }
 324                 session_name = bt_value_map_get(map, "session-name");
 325                 if (!session_name) {
 326                         ret = BT_VALUE_STATUS_ERROR;
 327                         goto end;
 328                 }
 329                 ret = bt_value_string_get(hostname, &hostname_str);
 330                 if (ret != BT_VALUE_STATUS_OK) {
 331                         goto end;
 332                 }
 333                 ret = bt_value_string_get(session_name, &session_name_str);
 334                 if (ret != BT_VALUE_STATUS_OK) {
 335                         goto end;
 336                 }
 337
 338                 if (!strcmp(session->hostname, hostname_str)
 339                                 && !strcmp(session->session_name,
 340                                         session_name_str)) {
 341                         int64_t val;
 342                         uint32_t streams = be32toh(session->streams);
 343                         uint32_t clients = be32toh(session->clients);
 344
 345                         found = true;
 346
 347                         btval = bt_value_map_get(map, "stream-count");
 348                         if (!btval) {
 349                                 ret = BT_VALUE_STATUS_ERROR;
 350                                 goto end;
 351                         }
 352                         ret = bt_value_integer_get(btval, &val);
 353                         if (ret != BT_VALUE_STATUS_OK) {
 354                                 goto end;
 355                         }
 356                         /* sum */
 357                         val += streams;
 358                         ret = bt_value_integer_set(btval, val);
 359                         if (ret != BT_VALUE_STATUS_OK) {
 360                                 goto end;
 361                         }
 362                         BT_PUT(btval);
 363
 364                         btval = bt_value_map_get(map, "client-count");
 365                         if (!btval) {
 366                                 ret = BT_VALUE_STATUS_ERROR;
 367                                 goto end;
 368                         }
 369                         ret = bt_value_integer_get(btval, &val);
 370                         if (ret != BT_VALUE_STATUS_OK) {
 371                                 goto end;
 372                         }
 373                         /* max */
 374                         val = max_t(int64_t, clients, val);
 375                         ret = bt_value_integer_set(btval, val);
 376                         if (ret != BT_VALUE_STATUS_OK) {
 377                                 goto end;
 378                         }
 379                         BT_PUT(btval);
 380                 }
 381
 382                 BT_PUT(hostname);
 383                 BT_PUT(session_name);
 384                 BT_PUT(map);
 385
 386                 if (found) {
 387                         break;
 388                 }
 389         }
 390 end:
 391         BT_PUT(btval);
 392         BT_PUT(hostname);
 393         BT_PUT(session_name);
 394         BT_PUT(map);
 395         *_found = found;
 396         return ret;
 397 }
 398
 399 static
 400 enum bt_value_status list_append_session(struct bt_value *results,
 401                 GString *base_url,
 402                 const struct lttng_viewer_session *session)
 403 {
 404         enum bt_value_status ret = BT_VALUE_STATUS_OK;
 405         struct bt_value *map = NULL;
 406         GString *url = NULL;
 407         bool found = false;
 408
 409         /*
 410          * If the session already exists, add the stream count to it,
 411          * and do max of client counts.
 412          */
 413         ret = list_update_session(results, session, &found);
 414         if (ret != BT_VALUE_STATUS_OK || found) {
 415                 goto end;
 416         }
 417
 418         map = bt_value_map_create();
 419         if (!map) {
 420                 ret = BT_VALUE_STATUS_ERROR;
 421                 goto end;
 422         }
 423
 424         if (base_url->len < 1) {
 425                 ret = BT_VALUE_STATUS_ERROR;
 426                 goto end;
 427         }
 428         /*
 429          * key = "url",
 430          * value = <string>,
 431          */
 432         url = g_string_new(base_url->str);
 433         g_string_append(url, "/host/");
 434         g_string_append(url, session->hostname);
 435         g_string_append_c(url, '/');
 436         g_string_append(url, session->session_name);
 437
 438         ret = bt_value_map_insert_string(map, "url", url->str);
 439         if (ret != BT_VALUE_STATUS_OK) {
 440                 goto end;
 441         }
 442
 443         /*
 444          * key = "target-hostname",
 445          * value = <string>,
 446          */
 447         ret = bt_value_map_insert_string(map, "target-hostname",
 448                 session->hostname);
 449         if (ret != BT_VALUE_STATUS_OK) {
 450                 goto end;
 451         }
 452
 453         /*
 454          * key = "session-name",
 455          * value = <string>,
 456          */
 457         ret = bt_value_map_insert_string(map, "session-name",
 458                 session->session_name);
 459         if (ret != BT_VALUE_STATUS_OK) {
 460                 goto end;
 461         }
 462
 463         /*
 464          * key = "timer-us",
 465          * value = <integer>,
 466          */
 467         {
 468                 uint32_t live_timer = be32toh(session->live_timer);
 469
 470                 ret = bt_value_map_insert_integer(map, "timer-us",
 471                         live_timer);
 472                 if (ret != BT_VALUE_STATUS_OK) {
 473                         goto end;
 474                 }
 475         }
 476
 477         /*
 478          * key = "stream-count",
 479          * value = <integer>,
 480          */
 481         {
 482                 uint32_t streams = be32toh(session->streams);
 483
 484                 ret = bt_value_map_insert_integer(map, "stream-count",
 485                         streams);
 486                 if (ret != BT_VALUE_STATUS_OK) {
 487                         goto end;
 488                 }
 489         }
 490
 491
 492         /*
 493          * key = "client-count",
 494          * value = <integer>,
 495          */
 496         {
 497                 uint32_t clients = be32toh(session->clients);
 498
 499                 ret = bt_value_map_insert_integer(map, "client-count",
 500                         clients);
 501                 if (ret != BT_VALUE_STATUS_OK) {
 502                         goto end;
 503                 }
 504         }
 505
 506         ret = bt_value_array_append(results, map);
 507 end:
 508         if (url) {
 509                 g_string_free(url, TRUE);
 510         }
 511         BT_PUT(map);
 512         return ret;
 513 }
 514
 515 /*
 516  * Data structure returned:
 517  *
 518  * {
 519  *   <array> = {
 520  *     [n] = {
 521  *       <map> = {
 522  *         {
 523  *           key = "url",
 524  *           value = <string>,
 525  *         },
 526  *         {
 527  *           key = "target-hostname",
 528  *           value = <string>,
 529  *         },
 530  *         {
 531  *           key = "session-name",
 532  *           value = <string>,
 533  *         },
 534  *         {
 535  *           key = "timer-us",
 536  *           value = <integer>,
 537  *         },
 538  *         {
 539  *           key = "stream-count",
 540  *           value = <integer>,
 541  *         },
 542  *         {
 543  *           key = "client-count",
 544  *           value = <integer>,
 545  *         },
 546  *       },
 547  *     }
 548  *   }
 549  */
 550
 551 BT_HIDDEN
 552 struct bt_value *bt_live_viewer_connection_list_sessions(struct bt_live_viewer_connection *viewer_connection)
 553 {
 554         struct bt_value *results = NULL;
 555         struct lttng_viewer_cmd cmd;
 556         struct lttng_viewer_list_sessions list;
 557         uint32_t i, sessions_count;
 558         ssize_t ret_len;
 559
 560         if (lttng_live_handshake(viewer_connection)) {
 561                 goto error;
 562         }
 563
 564         results = bt_value_array_create();
 565         if (!results) {
 566                 BT_LOGE("Error creating array");
 567                 goto error;
 568         }
 569
 570         cmd.cmd = htobe32(LTTNG_VIEWER_LIST_SESSIONS);
 571         cmd.data_size = htobe64((uint64_t) 0);
 572         cmd.cmd_version = htobe32(0);
 573
 574         ret_len = lttng_live_send(viewer_connection, &cmd, sizeof(cmd));
 575         if (ret_len < 0) {
 576                 BT_LOGE("Error sending cmd: %s", strerror(errno));
 577                 goto error;
 578         }
 579         assert(ret_len == sizeof(cmd));
 580
 581         ret_len = lttng_live_recv(viewer_connection, &list, sizeof(list));
 582         if (ret_len == 0) {
 583                 BT_LOGI("Remote side has closed connection");
 584                 goto error;
 585         }
 586         if (ret_len < 0) {
 587                 BT_LOGE("Error receiving session list: %s", strerror(errno));
 588                 goto error;
 589         }
 590         assert(ret_len == sizeof(list));
 591
 592         sessions_count = be32toh(list.sessions_count);
 593         for (i = 0; i < sessions_count; i++) {
 594                 struct lttng_viewer_session lsession;
 595
 596                 ret_len = lttng_live_recv(viewer_connection,
 597                                 &lsession, sizeof(lsession));
 598                 if (ret_len == 0) {
 599                         BT_LOGI("Remote side has closed connection");
 600                         goto error;
 601                 }
 602                 if (ret_len < 0) {
 603                         BT_LOGE("Error receiving session: %s", strerror(errno));
 604                         goto error;
 605                 }
 606                 assert(ret_len == sizeof(lsession));
 607                 lsession.hostname[LTTNG_VIEWER_HOST_NAME_MAX - 1] = '\0';
 608                 lsession.session_name[LTTNG_VIEWER_NAME_MAX - 1] = '\0';
 609                 if (list_append_session(results,
 610                                 viewer_connection->url, &lsession)
 611                                 != BT_VALUE_STATUS_OK) {
 612                         goto error;
 613                 }
 614         }
 615         goto end;
 616 error:
 617         BT_PUT(results);
 618 end:
 619         return results;
 620 }
 621
 622 static
 623 int lttng_live_query_session_ids(struct lttng_live_component *lttng_live)
 624 {
 625         struct lttng_viewer_cmd cmd;
 626         struct lttng_viewer_list_sessions list;
 627         struct lttng_viewer_session lsession;
 628         uint32_t i, sessions_count;
 629         ssize_t ret_len;
 630         uint64_t session_id;
 631         struct bt_live_viewer_connection *viewer_connection =
 632                         lttng_live->viewer_connection;
 633
 634         cmd.cmd = htobe32(LTTNG_VIEWER_LIST_SESSIONS);
 635         cmd.data_size = htobe64((uint64_t) 0);
 636         cmd.cmd_version = htobe32(0);
 637
 638         ret_len = lttng_live_send(viewer_connection, &cmd, sizeof(cmd));
 639         if (ret_len < 0) {
 640                 BT_LOGE("Error sending cmd: %s", strerror(errno));
 641                 goto error;
 642         }
 643         assert(ret_len == sizeof(cmd));
 644
 645         ret_len = lttng_live_recv(viewer_connection, &list, sizeof(list));
 646         if (ret_len == 0) {
 647                 BT_LOGI("Remote side has closed connection");
 648                 goto error;
 649         }
 650         if (ret_len < 0) {
 651                 BT_LOGE("Error receiving session list: %s", strerror(errno));
 652                 goto error;
 653         }
 654         assert(ret_len == sizeof(list));
 655
 656         sessions_count = be32toh(list.sessions_count);
 657         for (i = 0; i < sessions_count; i++) {
 658                 ret_len = lttng_live_recv(viewer_connection,
 659                                 &lsession, sizeof(lsession));
 660                 if (ret_len == 0) {
 661                         BT_LOGI("Remote side has closed connection");
 662                         goto error;
 663                 }
 664                 if (ret_len < 0) {
 665                         BT_LOGE("Error receiving session: %s", strerror(errno));
 666                         goto error;
 667                 }
 668                 assert(ret_len == sizeof(lsession));
 669                 lsession.hostname[LTTNG_VIEWER_HOST_NAME_MAX - 1] = '\0';
 670                 lsession.session_name[LTTNG_VIEWER_NAME_MAX - 1] = '\0';
 671                 session_id = be64toh(lsession.id);
 672
 673                 if ((strncmp(lsession.session_name,
 674                         viewer_connection->session_name->str,
 675                         MAXNAMLEN) == 0) && (strncmp(lsession.hostname,
 676                                 viewer_connection->target_hostname->str,
 677                                 MAXNAMLEN) == 0)) {
 678                         if (lttng_live_add_session(lttng_live, session_id)) {
 679                                 goto error;
 680                         }
 681                 }
 682         }
 683
 684         return 0;
 685
 686 error:
 687         BT_LOGE("Unable to query session ids");
 688         return -1;
 689 }
 690
 691 BT_HIDDEN
 692 int lttng_live_create_viewer_session(struct lttng_live_component *lttng_live)
 693 {
 694         struct lttng_viewer_cmd cmd;
 695         struct lttng_viewer_create_session_response resp;
 696         ssize_t ret_len;
 697         struct bt_live_viewer_connection *viewer_connection =
 698                         lttng_live->viewer_connection;
 699
 700         cmd.cmd = htobe32(LTTNG_VIEWER_CREATE_SESSION);
 701         cmd.data_size = htobe64((uint64_t) 0);
 702         cmd.cmd_version = htobe32(0);
 703
 704         ret_len = lttng_live_send(viewer_connection, &cmd, sizeof(cmd));
 705         if (ret_len < 0) {
 706                 BT_LOGE("Error sending cmd: %s", strerror(errno));
 707                 goto error;
 708         }
 709         assert(ret_len == sizeof(cmd));
 710
 711         ret_len = lttng_live_recv(viewer_connection, &resp, sizeof(resp));
 712         if (ret_len == 0) {
 713                 BT_LOGI("Remote side has closed connection");
 714                 goto error;
 715         }
 716         if (ret_len < 0) {
 717                 BT_LOGE("Error receiving create session reply: %s", strerror(errno));
 718                 goto error;
 719         }
 720         assert(ret_len == sizeof(resp));
 721
 722         if (be32toh(resp.status) != LTTNG_VIEWER_CREATE_SESSION_OK) {
 723                 BT_LOGE("Error creating viewer session");
 724                 goto error;
 725         }
 726         if (lttng_live_query_session_ids(lttng_live)) {
 727                 goto error;
 728         }
 729
 730         return 0;
 731
 732 error:
 733         return -1;
 734 }
 735
 736 static
 737 int receive_streams(struct lttng_live_session *session,
 738                 uint32_t stream_count)
 739 {
 740         ssize_t ret_len;
 741         uint32_t i;
 742         struct lttng_live_component *lttng_live = session->lttng_live;
 743         struct bt_live_viewer_connection *viewer_connection =
 744                         lttng_live->viewer_connection;
 745
 746         BT_LOGD("Getting %" PRIu32 " new streams:", stream_count);
 747         for (i = 0; i < stream_count; i++) {
 748                 struct lttng_viewer_stream stream;
 749                 struct lttng_live_stream_iterator *live_stream;
 750                 uint64_t stream_id;
 751                 uint64_t ctf_trace_id;
 752
 753                 ret_len = lttng_live_recv(viewer_connection, &stream, sizeof(stream));
 754                 if (ret_len == 0) {
 755                         BT_LOGI("Remote side has closed connection");
 756                         goto error;
 757                 }
 758                 if (ret_len < 0) {
 759                         BT_LOGE("Error receiving stream");
 760                         goto error;
 761                 }
 762                 assert(ret_len == sizeof(stream));
 763                 stream.path_name[LTTNG_VIEWER_PATH_MAX - 1] = '\0';
 764                 stream.channel_name[LTTNG_VIEWER_NAME_MAX - 1] = '\0';
 765                 stream_id = be64toh(stream.id);
 766                 ctf_trace_id = be64toh(stream.ctf_trace_id);
 767
 768                 if (stream.metadata_flag) {
 769                         BT_LOGD("    metadata stream %" PRIu64 " : %s/%s",
 770                                         stream_id, stream.path_name,
 771                                         stream.channel_name);
 772                         if (lttng_live_metadata_create_stream(session,
 773                                         ctf_trace_id, stream_id)) {
 774                                 BT_LOGE("Error creating metadata stream");
 775
 776                                 goto error;
 777                         }
 778                         session->lazy_stream_notif_init = true;
 779                 } else {
 780                         BT_LOGD("    stream %" PRIu64 " : %s/%s",
 781                                         stream_id, stream.path_name,
 782                                         stream.channel_name);
 783                         live_stream = lttng_live_stream_iterator_create(session,
 784                                 ctf_trace_id, stream_id);
 785                         if (!live_stream) {
 786                                 BT_LOGE("Error creating streamn");
 787                                 goto error;
 788                         }
 789                 }
 790         }
 791         return 0;
 792
 793 error:
 794         return -1;
 795 }
 796
 797 BT_HIDDEN
 798 int lttng_live_attach_session(struct lttng_live_session *session)
 799 {
 800         struct lttng_viewer_cmd cmd;
 801         struct lttng_viewer_attach_session_request rq;
 802         struct lttng_viewer_attach_session_response rp;
 803         ssize_t ret_len;
 804         struct lttng_live_component *lttng_live = session->lttng_live;
 805         struct bt_live_viewer_connection *viewer_connection =
 806                         lttng_live->viewer_connection;
 807         uint64_t session_id = session->id;
 808         uint32_t streams_count;
 809
 810         if (session->attached) {
 811                 return 0;
 812         }
 813
 814         cmd.cmd = htobe32(LTTNG_VIEWER_ATTACH_SESSION);
 815         cmd.data_size = htobe64((uint64_t) sizeof(rq));
 816         cmd.cmd_version = htobe32(0);
 817
 818         memset(&rq, 0, sizeof(rq));
 819         rq.session_id = htobe64(session_id);
 820         // TODO: add cmd line parameter to select seek beginning
 821         // rq.seek = htobe32(LTTNG_VIEWER_SEEK_BEGINNING);
 822         rq.seek = htobe32(LTTNG_VIEWER_SEEK_LAST);
 823
 824         ret_len = lttng_live_send(viewer_connection, &cmd, sizeof(cmd));
 825         if (ret_len < 0) {
 826                 BT_LOGE("Error sending cmd: %s", strerror(errno));
 827                 goto error;
 828         }
 829         assert(ret_len == sizeof(cmd));
 830
 831         ret_len = lttng_live_send(viewer_connection, &rq, sizeof(rq));
 832         if (ret_len < 0) {
 833                 BT_LOGE("Error sending attach request: %s", strerror(errno));
 834                 goto error;
 835         }
 836         assert(ret_len == sizeof(rq));
 837
 838         ret_len = lttng_live_recv(viewer_connection, &rp, sizeof(rp));
 839         if (ret_len == 0) {
 840                 BT_LOGI("Remote side has closed connection");
 841                 goto error;
 842         }
 843         if (ret_len < 0) {
 844                 BT_LOGE("Error receiving attach response: %s", strerror(errno));
 845                 goto error;
 846         }
 847         assert(ret_len == sizeof(rp));
 848
 849         streams_count = be32toh(rp.streams_count);
 850         switch(be32toh(rp.status)) {
 851         case LTTNG_VIEWER_ATTACH_OK:
 852                 break;
 853         case LTTNG_VIEWER_ATTACH_UNK:
 854                 BT_LOGW("Session id %" PRIu64 " is unknown", session_id);
 855                 goto error;
 856         case LTTNG_VIEWER_ATTACH_ALREADY:
 857                 BT_LOGW("There is already a viewer attached to this session");
 858                 goto error;
 859         case LTTNG_VIEWER_ATTACH_NOT_LIVE:
 860                 BT_LOGW("Not a live session");
 861                 goto error;
 862         case LTTNG_VIEWER_ATTACH_SEEK_ERR:
 863                 BT_LOGE("Wrong seek parameter");
 864                 goto error;
 865         default:
 866                 BT_LOGE("Unknown attach return code %u", be32toh(rp.status));
 867                 goto error;
 868         }
 869
 870         /* We receive the initial list of streams. */
 871         if (receive_streams(session, streams_count)) {
 872                 goto error;
 873         }
 874
 875         session->attached = true;
 876         session->new_streams_needed = false;
 877
 878         return 0;
 879
 880 error:
 881         return -1;
 882 }
 883
 884 BT_HIDDEN
 885 int lttng_live_detach_session(struct lttng_live_session *session)
 886 {
 887         struct lttng_viewer_cmd cmd;
 888         struct lttng_viewer_detach_session_request rq;
 889         struct lttng_viewer_detach_session_response rp;
 890         ssize_t ret_len;
 891         struct lttng_live_component *lttng_live = session->lttng_live;
 892         struct bt_live_viewer_connection *viewer_connection =
 893                         lttng_live->viewer_connection;
 894         uint64_t session_id = session->id;
 895
 896         if (!session->attached) {
 897                 return 0;
 898         }
 899
 900         cmd.cmd = htobe32(LTTNG_VIEWER_DETACH_SESSION);
 901         cmd.data_size = htobe64((uint64_t) sizeof(rq));
 902         cmd.cmd_version = htobe32(0);
 903
 904         memset(&rq, 0, sizeof(rq));
 905         rq.session_id = htobe64(session_id);
 906
 907         ret_len = lttng_live_send(viewer_connection, &cmd, sizeof(cmd));
 908         if (ret_len < 0) {
 909                 BT_LOGE("Error sending cmd: %s", strerror(errno));
 910                 goto error;
 911         }
 912         assert(ret_len == sizeof(cmd));
 913
 914         ret_len = lttng_live_send(viewer_connection, &rq, sizeof(rq));
 915         if (ret_len < 0) {
 916                 BT_LOGE("Error sending detach request: %s", strerror(errno));
 917                 goto error;
 918         }
 919         assert(ret_len == sizeof(rq));
 920
 921         ret_len = lttng_live_recv(viewer_connection, &rp, sizeof(rp));
 922         if (ret_len == 0) {
 923                 BT_LOGI("Remote side has closed connection");
 924                 goto error;
 925         }
 926         if (ret_len < 0) {
 927                 BT_LOGE("Error receiving detach response: %s", strerror(errno));
 928                 goto error;
 929         }
 930         assert(ret_len == sizeof(rp));
 931
 932         switch(be32toh(rp.status)) {
 933         case LTTNG_VIEWER_DETACH_SESSION_OK:
 934                 break;
 935         case LTTNG_VIEWER_DETACH_SESSION_UNK:
 936                 BT_LOGW("Session id %" PRIu64 " is unknown", session_id);
 937                 goto error;
 938         case LTTNG_VIEWER_DETACH_SESSION_ERR:
 939                 BT_LOGW("Error detaching session id %" PRIu64 "", session_id);
 940                 goto error;
 941         default:
 942                 BT_LOGE("Unknown detach return code %u", be32toh(rp.status));
 943                 goto error;
 944         }
 945
 946         session->attached = false;
 947
 948         return 0;
 949
 950 error:
 951         return -1;
 952 }
 953
 954 BT_HIDDEN
 955 ssize_t lttng_live_get_one_metadata_packet(struct lttng_live_trace *trace,
 956                 FILE *fp)
 957 {
 958         uint64_t len = 0;
 959         int ret;
 960         struct lttng_viewer_cmd cmd;
 961         struct lttng_viewer_get_metadata rq;
 962         struct lttng_viewer_metadata_packet rp;
 963         char *data = NULL;
 964         ssize_t ret_len;
 965         struct lttng_live_session *session = trace->session;
 966         struct lttng_live_component *lttng_live = session->lttng_live;
 967         struct lttng_live_metadata *metadata = trace->metadata;
 968         struct bt_live_viewer_connection *viewer_connection =
 969                         lttng_live->viewer_connection;
 970
 971         rq.stream_id = htobe64(metadata->stream_id);
 972         cmd.cmd = htobe32(LTTNG_VIEWER_GET_METADATA);
 973         cmd.data_size = htobe64((uint64_t) sizeof(rq));
 974         cmd.cmd_version = htobe32(0);
 975
 976         ret_len = lttng_live_send(viewer_connection, &cmd, sizeof(cmd));
 977         if (ret_len < 0) {
 978                 BT_LOGE("Error sending cmd: %s", strerror(errno));
 979                 goto error;
 980         }
 981         assert(ret_len == sizeof(cmd));
 982
 983         ret_len = lttng_live_send(viewer_connection, &rq, sizeof(rq));
 984         if (ret_len < 0) {
 985                 BT_LOGE("Error sending get_metadata request: %s", strerror(errno));
 986                 goto error;
 987         }
 988         assert(ret_len == sizeof(rq));
 989
 990         ret_len = lttng_live_recv(viewer_connection, &rp, sizeof(rp));
 991         if (ret_len == 0) {
 992                 BT_LOGI("Remote side has closed connection");
 993                 goto error;
 994         }
 995         if (ret_len < 0) {
 996                 BT_LOGE("Error receiving get_metadata response: %s", strerror(errno));
 997                 goto error;
 998         }
 999         assert(ret_len == sizeof(rp));
1000
1001         switch (be32toh(rp.status)) {
1002                 case LTTNG_VIEWER_METADATA_OK:
1003                         BT_LOGD("get_metadata : OK");
1004                         break;
1005                 case LTTNG_VIEWER_NO_NEW_METADATA:
1006                         BT_LOGD("get_metadata : NO NEW");
1007                         ret = 0;
1008                         goto end;
1009                 case LTTNG_VIEWER_METADATA_ERR:
1010                         BT_LOGD("get_metadata : ERR");
1011                         goto error;
1012                 default:
1013                         BT_LOGD("get_metadata : UNKNOWN");
1014                         goto error;
1015         }
1016
1017         len = be64toh(rp.len);
1018         BT_LOGD("Writing %" PRIu64" bytes to metadata", len);
1019         if (len <= 0) {
1020                 goto error;
1021         }
1022
1023         data = zmalloc(len);
1024         if (!data) {
1025                 BT_LOGE("relay data zmalloc: %s", strerror(errno));
1026                 goto error;
1027         }
1028         ret_len = lttng_live_recv(viewer_connection, data, len);
1029         if (ret_len == 0) {
1030                 BT_LOGI("Remote side has closed connection");
1031                 goto error_free_data;
1032         }
1033         if (ret_len < 0) {
1034                 BT_LOGE("Error receiving trace packet: %s", strerror(errno));
1035                 goto error_free_data;
1036         }
1037         assert(ret_len == len);
1038
1039         do {
1040                 ret_len = fwrite(data, 1, len, fp);
1041         } while (ret_len < 0 && errno == EINTR);
1042         if (ret_len < 0) {
1043                 BT_LOGE("Writing in the metadata fp");
1044                 goto error_free_data;
1045         }
1046         assert(ret_len == len);
1047         free(data);
1048         ret = len;
1049 end:
1050         return ret;
1051
1052 error_free_data:
1053         free(data);
1054 error:
1055         return -1;
1056 }
1057
1058 /*
1059  * Assign the fields from a lttng_viewer_index to a packet_index.
1060  */
1061 static
1062 void lttng_index_to_packet_index(struct lttng_viewer_index *lindex,
1063                 struct packet_index *pindex)
1064 {
1065         assert(lindex);
1066         assert(pindex);
1067
1068         pindex->offset = be64toh(lindex->offset);
1069         pindex->packet_size = be64toh(lindex->packet_size);
1070         pindex->content_size = be64toh(lindex->content_size);
1071         pindex->ts_cycles.timestamp_begin = be64toh(lindex->timestamp_begin);
1072         pindex->ts_cycles.timestamp_end = be64toh(lindex->timestamp_end);
1073         pindex->events_discarded = be64toh(lindex->events_discarded);
1074 }
1075
1076 BT_HIDDEN
1077 enum bt_ctf_lttng_live_iterator_status lttng_live_get_next_index(struct lttng_live_component *lttng_live,
1078                 struct lttng_live_stream_iterator *stream,
1079                 struct packet_index *index)
1080 {
1081         struct lttng_viewer_cmd cmd;
1082         struct lttng_viewer_get_next_index rq;
1083         ssize_t ret_len;
1084         struct lttng_viewer_index rp;
1085         uint32_t flags, status;
1086         enum bt_ctf_lttng_live_iterator_status retstatus =
1087                         BT_CTF_LTTNG_LIVE_ITERATOR_STATUS_OK;
1088         struct bt_live_viewer_connection *viewer_connection =
1089                         lttng_live->viewer_connection;
1090         struct lttng_live_trace *trace = stream->trace;
1091
1092         cmd.cmd = htobe32(LTTNG_VIEWER_GET_NEXT_INDEX);
1093         cmd.data_size = htobe64((uint64_t) sizeof(rq));
1094         cmd.cmd_version = htobe32(0);
1095
1096         memset(&rq, 0, sizeof(rq));
1097         rq.stream_id = htobe64(stream->viewer_stream_id);
1098
1099         ret_len = lttng_live_send(viewer_connection, &cmd, sizeof(cmd));
1100         if (ret_len < 0) {
1101                 BT_LOGE("Error sending cmd: %s", strerror(errno));
1102                 goto error;
1103         }
1104         assert(ret_len == sizeof(cmd));
1105
1106         ret_len = lttng_live_send(viewer_connection, &rq, sizeof(rq));
1107         if (ret_len < 0) {
1108                 BT_LOGE("Error sending get_next_index request: %s", strerror(errno));
1109                 goto error;
1110         }
1111         assert(ret_len == sizeof(rq));
1112
1113         ret_len = lttng_live_recv(viewer_connection, &rp, sizeof(rp));
1114         if (ret_len == 0) {
1115                 BT_LOGI("Remote side has closed connection");
1116                 goto error;
1117         }
1118         if (ret_len < 0) {
1119                 BT_LOGE("Error receiving get_next_index response: %s", strerror(errno));
1120                 goto error;
1121         }
1122         assert(ret_len == sizeof(rp));
1123
1124         flags = be32toh(rp.flags);
1125         status = be32toh(rp.status);
1126
1127         switch (status) {
1128         case LTTNG_VIEWER_INDEX_INACTIVE:
1129         {
1130                 uint64_t ctf_stream_class_id;
1131
1132                 BT_LOGD("get_next_index: inactive");
1133                 memset(index, 0, sizeof(struct packet_index));
1134                 index->ts_cycles.timestamp_end = be64toh(rp.timestamp_end);
1135                 stream->current_inactivity_timestamp = index->ts_cycles.timestamp_end;
1136                 ctf_stream_class_id = be64toh(rp.stream_id);
1137                 if (stream->ctf_stream_class_id != -1ULL) {
1138                         assert(stream->ctf_stream_class_id ==
1139                                 ctf_stream_class_id);
1140                 } else {
1141                         stream->ctf_stream_class_id = ctf_stream_class_id;
1142                 }
1143                 stream->state = LTTNG_LIVE_STREAM_QUIESCENT;
1144                 break;
1145         }
1146         case LTTNG_VIEWER_INDEX_OK:
1147         {
1148                 uint64_t ctf_stream_class_id;
1149
1150                 BT_LOGD("get_next_index: OK");
1151                 lttng_index_to_packet_index(&rp, index);
1152                 ctf_stream_class_id = be64toh(rp.stream_id);
1153                 if (stream->ctf_stream_class_id != -1ULL) {
1154                         assert(stream->ctf_stream_class_id ==
1155                                 ctf_stream_class_id);
1156                 } else {
1157                         stream->ctf_stream_class_id = ctf_stream_class_id;
1158                 }
1159
1160                 stream->state = LTTNG_LIVE_STREAM_ACTIVE_DATA;
1161                 stream->current_packet_end_timestamp =
1162                         index->ts_cycles.timestamp_end;
1163
1164                 if (flags & LTTNG_VIEWER_FLAG_NEW_METADATA) {
1165                         BT_LOGD("get_next_index: new metadata needed");
1166                         trace->new_metadata_needed = true;
1167                 }
1168                 if (flags & LTTNG_VIEWER_FLAG_NEW_STREAM) {
1169                         BT_LOGD("get_next_index: new streams needed");
1170                         lttng_live_need_new_streams(lttng_live);
1171                 }
1172                 break;
1173         }
1174         case LTTNG_VIEWER_INDEX_RETRY:
1175                 BT_LOGD("get_next_index: retry");
1176                 memset(index, 0, sizeof(struct packet_index));
1177                 retstatus = BT_CTF_LTTNG_LIVE_ITERATOR_STATUS_AGAIN;
1178                 stream->state = LTTNG_LIVE_STREAM_ACTIVE_NO_DATA;
1179                 goto end;
1180         case LTTNG_VIEWER_INDEX_HUP:
1181                 BT_LOGD("get_next_index: stream hung up");
1182                 memset(index, 0, sizeof(struct packet_index));
1183                 index->offset = EOF;
1184                 retstatus = BT_CTF_LTTNG_LIVE_ITERATOR_STATUS_END;
1185                 stream->state = LTTNG_LIVE_STREAM_EOF;
1186                 break;
1187         case LTTNG_VIEWER_INDEX_ERR:
1188                 BT_LOGE("get_next_index: error");
1189                 memset(index, 0, sizeof(struct packet_index));
1190                 stream->state = LTTNG_LIVE_STREAM_ACTIVE_NO_DATA;
1191                 goto error;
1192         default:
1193                 BT_LOGE("get_next_index: unknown value");
1194                 memset(index, 0, sizeof(struct packet_index));
1195                 stream->state = LTTNG_LIVE_STREAM_ACTIVE_NO_DATA;
1196                 goto error;
1197         }
1198 end:
1199         return retstatus;
1200
1201 error:
1202         if (bt_graph_is_canceled(lttng_live->graph)) {
1203                 retstatus = BT_CTF_LTTNG_LIVE_ITERATOR_STATUS_AGAIN;
1204         } else {
1205                 retstatus = BT_CTF_LTTNG_LIVE_ITERATOR_STATUS_ERROR;
1206         }
1207         return retstatus;
1208 }
1209
1210 BT_HIDDEN
1211 enum bt_ctf_notif_iter_medium_status lttng_live_get_stream_bytes(struct lttng_live_component *lttng_live,
1212                 struct lttng_live_stream_iterator *stream, uint8_t *buf, uint64_t offset,
1213                 uint64_t req_len, uint64_t *recv_len)
1214 {
1215         enum bt_ctf_notif_iter_medium_status retstatus = BT_CTF_NOTIF_ITER_MEDIUM_STATUS_OK;
1216         struct lttng_viewer_cmd cmd;
1217         struct lttng_viewer_get_packet rq;
1218         struct lttng_viewer_trace_packet rp;
1219         ssize_t ret_len;
1220         uint32_t flags, status;
1221         struct bt_live_viewer_connection *viewer_connection =
1222                         lttng_live->viewer_connection;
1223         struct lttng_live_trace *trace = stream->trace;
1224
1225         BT_LOGD("lttng_live_get_stream_bytes: offset=%" PRIu64 ", req_len=%" PRIu64,
1226                         offset, req_len);
1227         cmd.cmd = htobe32(LTTNG_VIEWER_GET_PACKET);
1228         cmd.data_size = htobe64((uint64_t) sizeof(rq));
1229         cmd.cmd_version = htobe32(0);
1230
1231         memset(&rq, 0, sizeof(rq));
1232         rq.stream_id = htobe64(stream->viewer_stream_id);
1233         rq.offset = htobe64(offset);
1234         rq.len = htobe32(req_len);
1235
1236         ret_len = lttng_live_send(viewer_connection, &cmd, sizeof(cmd));
1237         if (ret_len < 0) {
1238                 BT_LOGE("Error sending cmd: %s", strerror(errno));
1239                 goto error;
1240         }
1241         assert(ret_len == sizeof(cmd));
1242
1243         ret_len = lttng_live_send(viewer_connection, &rq, sizeof(rq));
1244         if (ret_len < 0) {
1245                 BT_LOGE("Error sending get_data request: %s", strerror(errno));
1246                 goto error;
1247         }
1248         assert(ret_len == sizeof(rq));
1249
1250         ret_len = lttng_live_recv(viewer_connection, &rp, sizeof(rp));
1251         if (ret_len == 0) {
1252                 BT_LOGI("Remote side has closed connection");
1253                 goto error;
1254         }
1255         if (ret_len < 0) {
1256                 BT_LOGE("Error receiving get_data response: %s", strerror(errno));
1257                 goto error;
1258         }
1259         if (ret_len != sizeof(rp)) {
1260                 BT_LOGE("get_data_packet: expected %zu"
1261                                 ", received %zd", sizeof(rp),
1262                                 ret_len);
1263                 goto error;
1264         }
1265
1266         flags = be32toh(rp.flags);
1267         status = be32toh(rp.status);
1268
1269         switch (status) {
1270         case LTTNG_VIEWER_GET_PACKET_OK:
1271                 req_len = be32toh(rp.len);
1272                 BT_LOGD("get_data_packet: Ok, packet size : %" PRIu64 "", req_len);
1273                 break;
1274         case LTTNG_VIEWER_GET_PACKET_RETRY:
1275                 /* Unimplemented by relay daemon */
1276                 BT_LOGD("get_data_packet: retry");
1277                 retstatus = BT_CTF_NOTIF_ITER_MEDIUM_STATUS_AGAIN;
1278                 goto end;
1279         case LTTNG_VIEWER_GET_PACKET_ERR:
1280                 if (flags & LTTNG_VIEWER_FLAG_NEW_METADATA) {
1281                         BT_LOGD("get_data_packet: new metadata needed, try again later");
1282                         trace->new_metadata_needed = true;
1283                 }
1284                 if (flags & LTTNG_VIEWER_FLAG_NEW_STREAM) {
1285                         BT_LOGD("get_data_packet: new streams needed, try again later");
1286                         lttng_live_need_new_streams(lttng_live);
1287                 }
1288                 if (flags & (LTTNG_VIEWER_FLAG_NEW_METADATA
1289                                 | LTTNG_VIEWER_FLAG_NEW_STREAM)) {
1290                         retstatus = BT_CTF_NOTIF_ITER_MEDIUM_STATUS_AGAIN;
1291                         goto end;
1292                 }
1293                 BT_LOGE("get_data_packet: error");
1294                 goto error;
1295         case LTTNG_VIEWER_GET_PACKET_EOF:
1296                 retstatus = BT_CTF_NOTIF_ITER_MEDIUM_STATUS_EOF;
1297                 goto end;
1298         default:
1299                 BT_LOGE("get_data_packet: unknown");
1300                 goto error;
1301         }
1302
1303         if (req_len == 0) {
1304                 goto error;
1305         }
1306
1307         ret_len = lttng_live_recv(viewer_connection, buf, req_len);
1308         if (ret_len == 0) {
1309                 BT_LOGI("Remote side has closed connection");
1310                 goto error;
1311         }
1312         if (ret_len < 0) {
1313                 BT_LOGE("Error receiving trace packet: %s", strerror(errno));
1314                 goto error;
1315         }
1316         assert(ret_len == req_len);
1317         *recv_len = ret_len;
1318 end:
1319         return retstatus;
1320
1321 error:
1322         if (bt_graph_is_canceled(lttng_live->graph)) {
1323                 retstatus = BT_CTF_NOTIF_ITER_MEDIUM_STATUS_AGAIN;
1324         } else {
1325                 retstatus = BT_CTF_NOTIF_ITER_MEDIUM_STATUS_ERROR;
1326         }
1327         return retstatus;
1328 }
1329
1330 /*
1331  * Request new streams for a session.
1332  */
1333 BT_HIDDEN
1334 enum bt_ctf_lttng_live_iterator_status lttng_live_get_new_streams(
1335                 struct lttng_live_session *session)
1336 {
1337         enum bt_ctf_lttng_live_iterator_status status =
1338                         BT_CTF_LTTNG_LIVE_ITERATOR_STATUS_OK;
1339         struct lttng_viewer_cmd cmd;
1340         struct lttng_viewer_new_streams_request rq;
1341         struct lttng_viewer_new_streams_response rp;
1342         ssize_t ret_len;
1343         struct lttng_live_component *lttng_live = session->lttng_live;
1344         struct bt_live_viewer_connection *viewer_connection =
1345                         lttng_live->viewer_connection;
1346         uint32_t streams_count;
1347
1348         if (!session->new_streams_needed) {
1349                 return BT_CTF_LTTNG_LIVE_ITERATOR_STATUS_OK;
1350         }
1351
1352         cmd.cmd = htobe32(LTTNG_VIEWER_GET_NEW_STREAMS);
1353         cmd.data_size = htobe64((uint64_t) sizeof(rq));
1354         cmd.cmd_version = htobe32(0);
1355
1356         memset(&rq, 0, sizeof(rq));
1357         rq.session_id = htobe64(session->id);
1358
1359         ret_len = lttng_live_send(viewer_connection, &cmd, sizeof(cmd));
1360         if (ret_len < 0) {
1361                 BT_LOGE("Error sending cmd: %s", strerror(errno));
1362                 goto error;
1363         }
1364         assert(ret_len == sizeof(cmd));
1365
1366         ret_len = lttng_live_send(viewer_connection, &rq, sizeof(rq));
1367         if (ret_len < 0) {
1368                 BT_LOGE("Error sending get_new_streams request: %s", strerror(errno));
1369                 goto error;
1370         }
1371         assert(ret_len == sizeof(rq));
1372
1373         ret_len = lttng_live_recv(viewer_connection, &rp, sizeof(rp));
1374         if (ret_len == 0) {
1375                 BT_LOGI("Remote side has closed connection");
1376                 goto error;
1377         }
1378         if (ret_len < 0) {
1379                 BT_LOGE("Error receiving get_new_streams response");
1380                 goto error;
1381         }
1382         assert(ret_len == sizeof(rp));
1383
1384         streams_count = be32toh(rp.streams_count);
1385
1386         switch(be32toh(rp.status)) {
1387         case LTTNG_VIEWER_NEW_STREAMS_OK:
1388                 session->new_streams_needed = false;
1389                 break;
1390         case LTTNG_VIEWER_NEW_STREAMS_NO_NEW:
1391                 session->new_streams_needed = false;
1392                 goto end;
1393         case LTTNG_VIEWER_NEW_STREAMS_HUP:
1394                 session->new_streams_needed = false;
1395                 session->closed = true;
1396                 status = BT_CTF_LTTNG_LIVE_ITERATOR_STATUS_END;
1397                 goto end;
1398         case LTTNG_VIEWER_NEW_STREAMS_ERR:
1399                 BT_LOGE("get_new_streams error");
1400                 goto error;
1401         default:
1402                 BT_LOGE("Unknown return code %u", be32toh(rp.status));
1403                 goto error;
1404         }
1405
1406         if (receive_streams(session, streams_count)) {
1407                 goto error;
1408         }
1409 end:
1410         return status;
1411
1412 error:
1413         if (bt_graph_is_canceled(lttng_live->graph)) {
1414                 status = BT_CTF_NOTIF_ITER_MEDIUM_STATUS_AGAIN;
1415         } else {
1416                 status = BT_CTF_NOTIF_ITER_MEDIUM_STATUS_ERROR;
1417         }
1418         return status;
1419 }
1420
1421 BT_HIDDEN
1422 struct bt_live_viewer_connection *
1423         bt_live_viewer_connection_create(const char *url,
1424                         struct lttng_live_component *lttng_live)
1425 {
1426         struct bt_live_viewer_connection *viewer_connection;
1427
1428         viewer_connection = g_new0(struct bt_live_viewer_connection, 1);
1429
1430         bt_object_init(&viewer_connection->obj, connection_release);
1431         viewer_connection->control_sock = -1;
1432         viewer_connection->port = -1;
1433         viewer_connection->lttng_live = lttng_live;
1434         viewer_connection->url = g_string_new(url);
1435         if (!viewer_connection->url) {
1436                 goto error;
1437         }
1438
1439         BT_LOGD("Establishing connection to url \"%s\"...", url);
1440         if (lttng_live_connect_viewer(viewer_connection)) {
1441                 goto error_report;
1442         }
1443         BT_LOGD("Connection to url \"%s\" is established", url);
1444         return viewer_connection;
1445
1446 error_report:
1447         BT_LOGW("Failure to establish connection to url \"%s\"", url);
1448 error:
1449         g_free(viewer_connection);
1450         return NULL;
1451 }
1452
1453 BT_HIDDEN
1454 void bt_live_viewer_connection_destroy(struct bt_live_viewer_connection *viewer_connection)
1455 {
1456         BT_LOGD("Closing connection to url \"%s\"", viewer_connection->url->str);
1457         lttng_live_disconnect_viewer(viewer_connection);
1458         g_string_free(viewer_connection->url, TRUE);
1459         if (viewer_connection->relay_hostname) {
1460                 g_string_free(viewer_connection->relay_hostname, TRUE);
1461         }
1462         if (viewer_connection->target_hostname) {
1463                 g_string_free(viewer_connection->target_hostname, TRUE);
1464         }
1465         if (viewer_connection->session_name) {
1466                 g_string_free(viewer_connection->session_name, TRUE);
1467         }
1468         g_free(viewer_connection);
1469 }