src/bin/lttng/commands/rotate.c

   1 /*
   2  * Copyright (C) 2017 - Julien Desfossez <jdesfossez@efficios.com>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License, version 2 only,
   6  * as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along
  14  * with this program; if not, write to the Free Software Foundation, Inc.,
  15  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  16  */
  17
  18 #define _LGPL_SOURCE
  19 #include <popt.h>
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22 #include <string.h>
  23 #include <sys/stat.h>
  24 #include <sys/types.h>
  25 #include <unistd.h>
  26 #include <inttypes.h>
  27 #include <ctype.h>
  28 #include <assert.h>
  29
  30 #include <common/sessiond-comm/sessiond-comm.h>
  31 #include <common/mi-lttng.h>
  32
  33 #include "../command.h"
  34 #include <lttng/rotation.h>
  35 #include <lttng/location.h>
  36
  37 static char *opt_session_name;
  38 static int opt_no_wait;
  39 static struct mi_writer *writer;
  40
  41 #ifdef LTTNG_EMBED_HELP
  42 static const char help_msg[] =
  43 #include <lttng-rotate.1.h>
  44 ;
  45 #endif
  46
  47 enum {
  48         OPT_HELP = 1,
  49         OPT_LIST_OPTIONS,
  50 };
  51
  52 static struct poptOption long_options[] = {
  53         /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
  54         {"help",      'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0},
  55         {"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL},
  56         {"no-wait",   'n', POPT_ARG_VAL, &opt_no_wait, 1, 0, 0},
  57         {0, 0, 0, 0, 0, 0, 0}
  58 };
  59
  60 static int output_trace_archive_location(
  61                 const struct lttng_trace_archive_location *location,
  62                 const char *session_name)
  63 {
  64         int ret = 0;
  65         enum lttng_trace_archive_location_type location_type;
  66         enum lttng_trace_archive_location_status status;
  67         bool printed_location = false;
  68
  69         location_type = lttng_trace_archive_location_get_type(location);
  70
  71         _MSG("Trace chunk archive for session %s is now readable",
  72                         session_name);
  73         switch (location_type) {
  74         case LTTNG_TRACE_ARCHIVE_LOCATION_TYPE_LOCAL:
  75         {
  76                 const char *absolute_path;
  77
  78                 status = lttng_trace_archive_location_local_get_absolute_path(
  79                                 location, &absolute_path);
  80                 if (status != LTTNG_TRACE_ARCHIVE_LOCATION_STATUS_OK) {
  81                         ret = -1;
  82                         goto end;
  83                 }
  84                 MSG(" at %s", absolute_path);
  85                 printed_location = true;
  86                 break;
  87         }
  88         case LTTNG_TRACE_ARCHIVE_LOCATION_TYPE_RELAY:
  89         {
  90                 uint16_t control_port, data_port;
  91                 const char *host, *relative_path, *protocol_str;
  92                 enum lttng_trace_archive_location_relay_protocol_type protocol;
  93
  94                 /* Fetch all relay location parameters. */
  95                 status = lttng_trace_archive_location_relay_get_protocol_type(
  96                                 location, &protocol);
  97                 if (status != LTTNG_TRACE_ARCHIVE_LOCATION_STATUS_OK) {
  98                         ret = -1;
  99                         goto end;
 100                 }
 101
 102                 status = lttng_trace_archive_location_relay_get_host(
 103                                 location, &host);
 104                 if (status != LTTNG_TRACE_ARCHIVE_LOCATION_STATUS_OK) {
 105                         ret = -1;
 106                         goto end;
 107                 }
 108
 109                 status = lttng_trace_archive_location_relay_get_control_port(
 110                                 location, &control_port);
 111                 if (status != LTTNG_TRACE_ARCHIVE_LOCATION_STATUS_OK) {
 112                         ret = -1;
 113                         goto end;
 114                 }
 115
 116                 status = lttng_trace_archive_location_relay_get_data_port(
 117                                 location, &data_port);
 118                 if (status != LTTNG_TRACE_ARCHIVE_LOCATION_STATUS_OK) {
 119                         ret = -1;
 120                         goto end;
 121                 }
 122
 123                 status = lttng_trace_archive_location_relay_get_relative_path(
 124                                 location, &relative_path);
 125                 if (status != LTTNG_TRACE_ARCHIVE_LOCATION_STATUS_OK) {
 126                         ret = -1;
 127                         goto end;
 128                 }
 129
 130                 switch (protocol) {
 131                 case LTTNG_TRACE_ARCHIVE_LOCATION_RELAY_PROTOCOL_TYPE_TCP:
 132                         protocol_str = "tcp";
 133                         break;
 134                 default:
 135                         protocol_str = "unknown";
 136                         break;
 137                 }
 138
 139                 MSG(" on relay %s://%s/%s [control port %" PRIu16 ", data port %"
 140                                 PRIu16 "]", protocol_str, host,
 141                                 relative_path, control_port, data_port);
 142                 printed_location = true;
 143                 break;
 144         }
 145         default:
 146                 break;
 147         }
 148 end:
 149         if (!printed_location) {
 150                 MSG(" at an unknown location");
 151         }
 152         return ret;
 153 }
 154
 155 static int rotate_tracing(char *session_name)
 156 {
 157         int ret;
 158         enum cmd_error_code cmd_ret = CMD_SUCCESS;
 159         struct lttng_rotation_handle *handle = NULL;
 160         enum lttng_rotation_status rotation_status;
 161         enum lttng_rotation_state rotation_state = LTTNG_ROTATION_STATE_ONGOING;
 162         const struct lttng_trace_archive_location *location = NULL;
 163         bool print_location = true;
 164
 165         DBG("Rotating the output files of session %s", session_name);
 166
 167         ret = lttng_rotate_session(session_name, NULL, &handle);
 168         if (ret < 0) {
 169                 switch (-ret) {
 170                 case LTTNG_ERR_SESSION_NOT_STARTED:
 171                         WARN("Tracing session %s not started yet", session_name);
 172                         cmd_ret = CMD_WARNING;
 173                         goto end;
 174                 default:
 175                         ERR("%s", lttng_strerror(ret));
 176                         goto error;
 177                 }
 178         }
 179
 180         if (opt_no_wait) {
 181                 rotation_state = LTTNG_ROTATION_STATE_ONGOING;
 182                 goto skip_wait;
 183         }
 184
 185         _MSG("Waiting for rotation to complete");
 186         ret = fflush(stdout);
 187         if (ret) {
 188                 PERROR("fflush");
 189                 goto error;
 190         }
 191
 192         do {
 193                 rotation_status = lttng_rotation_handle_get_state(handle,
 194                                 &rotation_state);
 195                 if (rotation_status != LTTNG_ROTATION_STATUS_OK) {
 196                         ERR("Failed to query the state of the rotation.");
 197                         goto error;
 198                 }
 199
 200                 if (rotation_state == LTTNG_ROTATION_STATE_ONGOING) {
 201                         ret = usleep(DEFAULT_DATA_AVAILABILITY_WAIT_TIME);
 202                         if (ret) {
 203                                 PERROR("usleep");
 204                                 goto error;
 205                         }
 206                         _MSG(".");
 207
 208                         ret = fflush(stdout);
 209                         if (ret) {
 210                                 PERROR("fflush");
 211                                 goto error;
 212                         }
 213                 }
 214         } while (rotation_state == LTTNG_ROTATION_STATE_ONGOING);
 215         MSG("");
 216
 217 skip_wait:
 218         switch (rotation_state) {
 219         case LTTNG_ROTATION_STATE_COMPLETED:
 220                 rotation_status = lttng_rotation_handle_get_archive_location(
 221                                 handle, &location);
 222                 if (rotation_status != LTTNG_ROTATION_STATUS_OK) {
 223                         ERR("Failed to retrieve the rotation's completed chunk archive location.");
 224                         cmd_ret = CMD_ERROR;
 225                 }
 226                 break;
 227         case LTTNG_ROTATION_STATE_EXPIRED:
 228                 break;
 229         case LTTNG_ROTATION_STATE_ERROR:
 230                 ERR("Failed to retrieve rotation state.");
 231                 goto error;
 232         case LTTNG_ROTATION_STATE_ONGOING:
 233                 MSG("Rotation ongoing for session %s", session_name);
 234                 print_location = false;
 235                 break;
 236         default:
 237                 ERR("Unexpected rotation state encountered.");
 238                 goto error;
 239         }
 240
 241         if (!lttng_opt_mi && print_location) {
 242                 ret = output_trace_archive_location(location,
 243                                 session_name);
 244         } else if (lttng_opt_mi) {
 245                 ret = mi_lttng_rotate(writer, session_name, rotation_state,
 246                                 location);
 247         }
 248
 249         if (ret < 0) {
 250                 cmd_ret = CMD_ERROR;
 251         }
 252
 253 end:
 254         lttng_rotation_handle_destroy(handle);
 255         return cmd_ret;
 256 error:
 257         cmd_ret = CMD_ERROR;
 258         goto end;
 259 }
 260
 261 /*
 262  *  cmd_rotate
 263  *
 264  *  The 'rotate <options>' first level command
 265  */
 266 int cmd_rotate(int argc, const char **argv)
 267 {
 268         int opt, ret;
 269         enum cmd_error_code cmd_ret = CMD_SUCCESS;
 270         int popt_ret;
 271         static poptContext pc;
 272         char *session_name = NULL;
 273         bool free_session_name = false;
 274
 275         pc = poptGetContext(NULL, argc, argv, long_options, 0);
 276         popt_ret = poptReadDefaultConfig(pc, 0);
 277         if (popt_ret) {
 278                 ERR("poptReadDefaultConfig");
 279                 goto error;
 280         }
 281
 282         while ((opt = poptGetNextOpt(pc)) != -1) {
 283                 switch (opt) {
 284                 case OPT_HELP:
 285                         SHOW_HELP();
 286                         goto end;
 287                 case OPT_LIST_OPTIONS:
 288                         list_cmd_options(stdout, long_options);
 289                         goto end;
 290                 default:
 291                         cmd_ret = CMD_UNDEFINED;
 292                         goto end;
 293                 }
 294         }
 295
 296         opt_session_name = (char*) poptGetArg(pc);
 297
 298         if (!opt_session_name) {
 299                 session_name = get_session_name();
 300                 if (!session_name) {
 301                         goto error;
 302                 }
 303                 free_session_name = true;
 304         } else {
 305                 session_name = opt_session_name;
 306         }
 307
 308         /* Mi check */
 309         if (lttng_opt_mi) {
 310                 writer = mi_lttng_writer_create(fileno(stdout), lttng_opt_mi);
 311                 if (!writer) {
 312                         goto error;
 313                 }
 314
 315                 /* Open rotate command */
 316                 ret = mi_lttng_writer_command_open(writer,
 317                                 mi_lttng_element_command_rotate);
 318                 if (ret) {
 319                         goto error;
 320                 }
 321
 322                 /* Open output element */
 323                 ret = mi_lttng_writer_open_element(writer,
 324                                 mi_lttng_element_command_output);
 325                 if (ret) {
 326                         goto error;
 327                 }
 328         }
 329
 330         cmd_ret = rotate_tracing(session_name);
 331
 332         /* Mi closing */
 333         if (lttng_opt_mi) {
 334                 /* Close output element */
 335                 ret = mi_lttng_writer_close_element(writer);
 336                 if (ret) {
 337                         goto error;
 338                 }
 339                 /* Success ? */
 340                 ret = mi_lttng_writer_write_element_bool(writer,
 341                                 mi_lttng_element_command_success,
 342                                 cmd_ret == CMD_SUCCESS);
 343                 if (ret) {
 344                         goto error;
 345                 }
 346
 347                 /* Command element close */
 348                 ret = mi_lttng_writer_command_close(writer);
 349                 if (ret) {
 350                         goto error;
 351                 }
 352         }
 353
 354         /* Mi clean-up */
 355         if (writer && mi_lttng_writer_destroy(writer)) {
 356                 goto error;
 357         }
 358 end:
 359         poptFreeContext(pc);
 360         if (free_session_name) {
 361                 free(session_name);
 362         }
 363
 364         return cmd_ret;
 365 error:
 366         cmd_ret = CMD_ERROR;
 367         goto end;
 368 }