src/bin/lttng/commands/enable_rotation.cpp

   1 /*
   2  * Copyright (C) 2017 Julien Desfossez <jdesfossez@efficios.com>
   3  *
   4  * SPDX-License-Identifier: GPL-2.0-only
   5  *
   6  */
   7
   8 #define _LGPL_SOURCE
   9 #include <popt.h>
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12 #include <string.h>
  13 #include <sys/stat.h>
  14 #include <sys/types.h>
  15 #include <unistd.h>
  16 #include <inttypes.h>
  17 #include <ctype.h>
  18
  19 #include <common/sessiond-comm/sessiond-comm.h>
  20 #include <common/mi-lttng.h>
  21 #include <common/utils.h>
  22
  23 #include "../command.h"
  24 #include <lttng/lttng.h>
  25
  26 static char *opt_session_name;
  27 static struct mi_writer *writer;
  28
  29 #ifdef LTTNG_EMBED_HELP
  30 static const char help_msg[] =
  31 #include <lttng-enable-rotation.1.h>
  32 ;
  33 #endif
  34
  35 enum {
  36         OPT_HELP = 1,
  37         OPT_LIST_OPTIONS,
  38         OPT_TIMER,
  39         OPT_SIZE,
  40 };
  41
  42 static struct poptOption long_options[] = {
  43         /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
  44         {"help",        'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0},
  45         {"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL},
  46         {"session",     's', POPT_ARG_STRING, &opt_session_name, 0, 0, 0},
  47         {"timer",        0,   POPT_ARG_INT, 0, OPT_TIMER, 0, 0},
  48         {"size",         0,   POPT_ARG_INT, 0, OPT_SIZE, 0, 0},
  49         {0, 0, 0, 0, 0, 0, 0}
  50 };
  51
  52 static const char *schedule_type_str[] = {
  53         "size-based",
  54         "periodic",
  55 };
  56
  57 static enum cmd_error_code add_schedule(const char *session_name,
  58                 enum lttng_rotation_schedule_type schedule_type, uint64_t value)
  59 {
  60         enum cmd_error_code ret = CMD_SUCCESS;
  61         struct lttng_rotation_schedule *schedule = NULL;
  62         enum lttng_rotation_status status;
  63         const char *schedule_type_name;
  64
  65         switch (schedule_type) {
  66         case LTTNG_ROTATION_SCHEDULE_TYPE_PERIODIC:
  67                 schedule = lttng_rotation_schedule_periodic_create();
  68                 if (!schedule) {
  69                         ret = CMD_ERROR;
  70                         goto end;
  71                 }
  72                 status = lttng_rotation_schedule_periodic_set_period(schedule,
  73                                 value);
  74                 break;
  75         case LTTNG_ROTATION_SCHEDULE_TYPE_SIZE_THRESHOLD:
  76                 schedule = lttng_rotation_schedule_size_threshold_create();
  77                 if (!schedule) {
  78                         ret = CMD_ERROR;
  79                         goto end;
  80                 }
  81                 status = lttng_rotation_schedule_size_threshold_set_threshold(
  82                                 schedule, value);
  83                 break;
  84         default:
  85                 ERR("Unknown schedule type");
  86                 abort();
  87         }
  88
  89         schedule_type_name = schedule_type_str[schedule_type];
  90
  91         switch (status) {
  92         case LTTNG_ROTATION_STATUS_OK:
  93                 break;
  94         case LTTNG_ROTATION_STATUS_INVALID:
  95                 ERR("Invalid value for %s option", schedule_type_name);
  96                 ret = CMD_ERROR;
  97                 goto end;
  98         default:
  99                 ERR("Unknown error occurred setting %s rotation schedule",
 100                                 schedule_type_name);
 101                 ret = CMD_ERROR;
 102                 goto end;
 103         }
 104
 105         status = lttng_session_add_rotation_schedule(session_name, schedule);
 106         switch (status) {
 107         case LTTNG_ROTATION_STATUS_OK:
 108                 ret = CMD_SUCCESS;
 109                 switch (schedule_type) {
 110                 case LTTNG_ROTATION_SCHEDULE_TYPE_PERIODIC:
 111                         MSG("Enabled %s rotations every %" PRIu64 " %s on session %s",
 112                                         schedule_type_name, value, USEC_UNIT, session_name);
 113                         break;
 114                 case LTTNG_ROTATION_SCHEDULE_TYPE_SIZE_THRESHOLD:
 115                         MSG("Enabled %s rotations every %" PRIu64 " bytes written on session %s",
 116                                         schedule_type_name, value, session_name);
 117                         break;
 118                 default:
 119                         abort();
 120                 }
 121                 break;
 122         case LTTNG_ROTATION_STATUS_INVALID:
 123                 ERR("Invalid parameter for %s rotation schedule",
 124                                 schedule_type_name);
 125                 ret = CMD_ERROR;
 126                 break;
 127         case LTTNG_ROTATION_STATUS_SCHEDULE_ALREADY_SET:
 128                 ERR("A %s rotation schedule is already set on session %s",
 129                                 schedule_type_name,
 130                                 session_name);
 131                 ret = CMD_ERROR;
 132                 break;
 133         case LTTNG_ROTATION_STATUS_ERROR:
 134         default:
 135                 ERR("Failed to enable %s rotation schedule on session %s",
 136                                 schedule_type_name,
 137                                 session_name);
 138                 ret = CMD_ERROR;
 139                 break;
 140         }
 141
 142         if (lttng_opt_mi) {
 143                 int mi_ret;
 144
 145                 mi_ret = mi_lttng_rotation_schedule_result(writer,
 146                                 schedule, ret == CMD_SUCCESS);
 147                 if (mi_ret < 0) {
 148                         ret = CMD_ERROR;
 149                         goto end;
 150                 }
 151         }
 152
 153 end:
 154         lttng_rotation_schedule_destroy(schedule);
 155         return ret;
 156 }
 157
 158 /*
 159  *  cmd_enable_rotation
 160  *
 161  *  The 'enable-rotation <options>' first level command
 162  */
 163 int cmd_enable_rotation(int argc, const char **argv)
 164 {
 165         int popt_ret, opt, ret = 0;
 166         enum cmd_error_code cmd_ret = CMD_SUCCESS;
 167         static poptContext pc;
 168         char *session_name = NULL;
 169         char *opt_arg = NULL;
 170         bool free_session_name = false;
 171         uint64_t timer_us = 0, size_bytes = 0;
 172         bool periodic_rotation = false, size_rotation = false;
 173
 174         pc = poptGetContext(NULL, argc, argv, long_options, 0);
 175         popt_ret = poptReadDefaultConfig(pc, 0);
 176         if (popt_ret) {
 177                 ERR("poptReadDefaultConfig");
 178                 goto error;
 179         }
 180
 181         while ((opt = poptGetNextOpt(pc)) != -1) {
 182                 switch (opt) {
 183                 case OPT_HELP:
 184                         SHOW_HELP();
 185                         goto end;
 186                 case OPT_LIST_OPTIONS:
 187                         list_cmd_options(stdout, long_options);
 188                         goto end;
 189                 case OPT_TIMER:
 190                         errno = 0;
 191                         opt_arg = poptGetOptArg(pc);
 192                         if (errno != 0 || !isdigit(opt_arg[0])) {
 193                                 ERR("Invalid value for --timer option: %s", opt_arg);
 194                                 goto error;
 195                         }
 196                         if (utils_parse_time_suffix(opt_arg, &timer_us) < 0) {
 197                                 ERR("Invalid value for --timer option: %s", opt_arg);
 198                                 goto error;
 199                         }
 200                         if (periodic_rotation) {
 201                                 ERR("Only one periodic rotation schedule may be set on a session.");
 202                                 goto error;
 203                         }
 204                         periodic_rotation = true;
 205                         break;
 206                 case OPT_SIZE:
 207                         errno = 0;
 208                         opt_arg = poptGetOptArg(pc);
 209                         if (utils_parse_size_suffix(opt_arg, &size_bytes) < 0) {
 210                                 ERR("Invalid value for --size option: %s", opt_arg);
 211                                 goto error;
 212                         }
 213                         if (size_rotation) {
 214                                 ERR("Only one size-based rotation schedule may be set on a session.");
 215                                 goto error;
 216                         }
 217                         size_rotation = true;
 218                         break;
 219                 default:
 220                         cmd_ret = CMD_UNDEFINED;
 221                         goto end;
 222                 }
 223         }
 224
 225         if (opt_session_name == NULL) {
 226                 session_name = get_session_name();
 227                 if (session_name == NULL) {
 228                         goto error;
 229                 }
 230                 free_session_name = true;
 231         } else {
 232                 session_name = opt_session_name;
 233         }
 234
 235         /* Mi check */
 236         if (lttng_opt_mi) {
 237                 writer = mi_lttng_writer_create(fileno(stdout), lttng_opt_mi);
 238                 if (!writer) {
 239                         goto error;
 240                 }
 241
 242                 /* Open command element */
 243                 ret = mi_lttng_writer_command_open(writer,
 244                                 mi_lttng_element_command_enable_rotation);
 245                 if (ret) {
 246                         goto error;
 247                 }
 248
 249                 /* Open output element */
 250                 ret = mi_lttng_writer_open_element(writer,
 251                                 mi_lttng_element_command_output);
 252                 if (ret) {
 253                         goto error;
 254                 }
 255         }
 256
 257         if (!periodic_rotation && !size_rotation) {
 258                 ERR("No session rotation schedule parameter provided.");
 259                 cmd_ret = CMD_ERROR;
 260                 goto close_command;
 261         }
 262
 263         if (lttng_opt_mi) {
 264                 ret = mi_lttng_writer_open_element(writer,
 265                                 mi_lttng_element_rotation_schedule_results);
 266                 if (ret) {
 267                         goto error;
 268                 }
 269
 270                 ret = mi_lttng_writer_write_element_string(writer,
 271                                 mi_lttng_element_session_name,
 272                                 session_name);
 273                 if (ret) {
 274                         goto error;
 275                 }
 276         }
 277
 278         if (periodic_rotation) {
 279                 /*
 280                  * Continue processing even on error as multiple schedules can
 281                  * be specified at once.
 282                  */
 283                 cmd_ret = add_schedule(session_name,
 284                                 LTTNG_ROTATION_SCHEDULE_TYPE_PERIODIC,
 285                                 timer_us);
 286         }
 287
 288         if (size_rotation) {
 289                 enum cmd_error_code tmp_ret;
 290
 291                 /* Don't overwrite cmd_ret if it already indicates an error. */
 292                 tmp_ret = add_schedule(session_name,
 293                                 LTTNG_ROTATION_SCHEDULE_TYPE_SIZE_THRESHOLD,
 294                                 size_bytes);
 295                 cmd_ret = cmd_ret ? cmd_ret : tmp_ret;
 296         }
 297
 298         if (lttng_opt_mi) {
 299                 /* Close rotation schedule results element */
 300                 ret = mi_lttng_writer_close_element(writer);
 301                 if (ret) {
 302                         goto error;
 303                 }
 304         }
 305
 306 close_command:
 307         /* Mi closing */
 308         if (lttng_opt_mi) {
 309                 /* Close output element */
 310                 ret = mi_lttng_writer_close_element(writer);
 311                 if (ret) {
 312                         goto error;
 313                 }
 314
 315                 /* Success ? */
 316                 ret = mi_lttng_writer_write_element_bool(writer,
 317                                 mi_lttng_element_command_success,
 318                                 cmd_ret == CMD_SUCCESS);
 319                 if (ret) {
 320                         goto error;
 321                 }
 322
 323                 /* Command element close */
 324                 ret = mi_lttng_writer_command_close(writer);
 325                 if (ret) {
 326                         goto error;
 327                 }
 328         }
 329
 330 end:
 331         (void) mi_lttng_writer_destroy(writer);
 332         poptFreeContext(pc);
 333         if (free_session_name) {
 334                 free(session_name);
 335         }
 336         return cmd_ret;
 337
 338 error:
 339         cmd_ret = CMD_ERROR;
 340         goto end;
 341 }