src/bin/lttng/commands/rotate.c

   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 #include <assert.h>
  19
  20 #include <common/sessiond-comm/sessiond-comm.h>
  21 #include <common/mi-lttng.h>
  22
  23 #include "../command.h"
  24 #include <lttng/lttng.h>
  25
  26 static char *opt_session_name;
  27 static int opt_no_wait;
  28 static struct mi_writer *writer;
  29
  30 #ifdef LTTNG_EMBED_HELP
  31 static const char help_msg[] =
  32 #include <lttng-rotate.1.h>
  33 ;
  34 #endif
  35
  36 enum {
  37         OPT_HELP = 1,
  38         OPT_LIST_OPTIONS,
  39 };
  40
  41 static struct poptOption long_options[] = {
  42         /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
  43         {"help",      'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0},
  44         {"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL},
  45         {"no-wait",   'n', POPT_ARG_VAL, &opt_no_wait, 1, 0, 0},
  46         {0, 0, 0, 0, 0, 0, 0}
  47 };
  48
  49 static int rotate_tracing(char *session_name)
  50 {
  51         int ret;
  52         enum cmd_error_code cmd_ret = CMD_SUCCESS;
  53         struct lttng_rotation_handle *handle = NULL;
  54         enum lttng_rotation_status rotation_status;
  55         enum lttng_rotation_state rotation_state = LTTNG_ROTATION_STATE_ONGOING;
  56         const struct lttng_trace_archive_location *location = NULL;
  57         bool print_location = true;
  58
  59         DBG("Rotating the output files of session %s", session_name);
  60
  61         ret = lttng_rotate_session(session_name, NULL, &handle);
  62         if (ret < 0) {
  63                 switch (-ret) {
  64                 case LTTNG_ERR_SESSION_NOT_STARTED:
  65                         WARN("Tracing session %s not started yet", session_name);
  66                         cmd_ret = CMD_WARNING;
  67                         goto end;
  68                 default:
  69                         ERR("%s", lttng_strerror(ret));
  70                         goto error;
  71                 }
  72         }
  73
  74         if (opt_no_wait) {
  75                 rotation_state = LTTNG_ROTATION_STATE_ONGOING;
  76                 goto skip_wait;
  77         }
  78
  79         _MSG("Waiting for rotation to complete");
  80         ret = fflush(stdout);
  81         if (ret) {
  82                 PERROR("fflush");
  83                 goto error;
  84         }
  85
  86         do {
  87                 rotation_status = lttng_rotation_handle_get_state(handle,
  88                                 &rotation_state);
  89                 if (rotation_status != LTTNG_ROTATION_STATUS_OK) {
  90                         MSG("");
  91                         ERR("Failed to query the state of the rotation.");
  92                         goto error;
  93                 }
  94
  95                 if (rotation_state == LTTNG_ROTATION_STATE_ONGOING) {
  96                         ret = usleep(DEFAULT_DATA_AVAILABILITY_WAIT_TIME_US);
  97                         if (ret) {
  98                                 PERROR("\nusleep");
  99                                 goto error;
 100                         }
 101                         _MSG(".");
 102
 103                         ret = fflush(stdout);
 104                         if (ret) {
 105                                 PERROR("\nfflush");
 106                                 goto error;
 107                         }
 108                 }
 109         } while (rotation_state == LTTNG_ROTATION_STATE_ONGOING);
 110         MSG("");
 111
 112 skip_wait:
 113         switch (rotation_state) {
 114         case LTTNG_ROTATION_STATE_COMPLETED:
 115                 rotation_status = lttng_rotation_handle_get_archive_location(
 116                                 handle, &location);
 117                 if (rotation_status != LTTNG_ROTATION_STATUS_OK) {
 118                         ERR("Failed to retrieve the rotation's completed chunk archive location.");
 119                         cmd_ret = CMD_ERROR;
 120                 }
 121                 break;
 122         case LTTNG_ROTATION_STATE_EXPIRED:
 123                 break;
 124         case LTTNG_ROTATION_STATE_ERROR:
 125                 ERR("Failed to retrieve rotation state.");
 126                 goto error;
 127         case LTTNG_ROTATION_STATE_ONGOING:
 128                 MSG("Rotation ongoing for session %s", session_name);
 129                 print_location = false;
 130                 break;
 131         default:
 132                 ERR("Unexpected rotation state encountered.");
 133                 goto error;
 134         }
 135
 136         if (!lttng_opt_mi && print_location) {
 137                 ret = print_trace_archive_location(location,
 138                                 session_name);
 139         } else if (lttng_opt_mi) {
 140                 ret = mi_lttng_rotate(writer, session_name, rotation_state,
 141                                 location);
 142         }
 143
 144         if (ret < 0) {
 145                 cmd_ret = CMD_ERROR;
 146         }
 147
 148 end:
 149         lttng_rotation_handle_destroy(handle);
 150         return cmd_ret;
 151 error:
 152         cmd_ret = CMD_ERROR;
 153         goto end;
 154 }
 155
 156 /*
 157  *  cmd_rotate
 158  *
 159  *  The 'rotate <options>' first level command
 160  */
 161 int cmd_rotate(int argc, const char **argv)
 162 {
 163         int opt, ret;
 164         enum cmd_error_code cmd_ret = CMD_SUCCESS;
 165         int popt_ret;
 166         static poptContext pc;
 167         char *session_name = NULL;
 168         bool free_session_name = false;
 169
 170         pc = poptGetContext(NULL, argc, argv, long_options, 0);
 171         popt_ret = poptReadDefaultConfig(pc, 0);
 172         if (popt_ret) {
 173                 ERR("poptReadDefaultConfig");
 174                 goto error;
 175         }
 176
 177         while ((opt = poptGetNextOpt(pc)) != -1) {
 178                 switch (opt) {
 179                 case OPT_HELP:
 180                         SHOW_HELP();
 181                         goto end;
 182                 case OPT_LIST_OPTIONS:
 183                         list_cmd_options(stdout, long_options);
 184                         goto end;
 185                 default:
 186                         cmd_ret = CMD_UNDEFINED;
 187                         goto end;
 188                 }
 189         }
 190
 191         opt_session_name = (char*) poptGetArg(pc);
 192
 193         if (!opt_session_name) {
 194                 session_name = get_session_name();
 195                 if (!session_name) {
 196                         goto error;
 197                 }
 198                 free_session_name = true;
 199         } else {
 200                 session_name = opt_session_name;
 201         }
 202
 203         /* Mi check */
 204         if (lttng_opt_mi) {
 205                 writer = mi_lttng_writer_create(fileno(stdout), lttng_opt_mi);
 206                 if (!writer) {
 207                         goto error;
 208                 }
 209
 210                 /* Open rotate command */
 211                 ret = mi_lttng_writer_command_open(writer,
 212                                 mi_lttng_element_command_rotate);
 213                 if (ret) {
 214                         goto error;
 215                 }
 216
 217                 /* Open output element */
 218                 ret = mi_lttng_writer_open_element(writer,
 219                                 mi_lttng_element_command_output);
 220                 if (ret) {
 221                         goto error;
 222                 }
 223         }
 224
 225         cmd_ret = rotate_tracing(session_name);
 226
 227         /* Mi closing */
 228         if (lttng_opt_mi) {
 229                 /* Close output element */
 230                 ret = mi_lttng_writer_close_element(writer);
 231                 if (ret) {
 232                         goto error;
 233                 }
 234                 /* Success ? */
 235                 ret = mi_lttng_writer_write_element_bool(writer,
 236                                 mi_lttng_element_command_success,
 237                                 cmd_ret == CMD_SUCCESS);
 238                 if (ret) {
 239                         goto error;
 240                 }
 241
 242                 /* Command element close */
 243                 ret = mi_lttng_writer_command_close(writer);
 244                 if (ret) {
 245                         goto error;
 246                 }
 247         }
 248
 249         /* Mi clean-up */
 250         if (writer && mi_lttng_writer_destroy(writer)) {
 251                 goto error;
 252         }
 253 end:
 254         poptFreeContext(pc);
 255         if (free_session_name) {
 256                 free(session_name);
 257         }
 258
 259         return cmd_ret;
 260 error:
 261         cmd_ret = CMD_ERROR;
 262         goto end;
 263 }