modules/misc/logger.c

   1 /*****************************************************************************
   2  * logger.c : file logging plugin for vlc
   3  *****************************************************************************
   4  * Copyright (C) 2002-2008 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Samuel Hocevar <sam@zoy.org>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License along
  20  * with this program; if not, write to the Free Software Foundation, Inc.,
  21  * 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  22  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * Preamble
  26  *****************************************************************************/
  27
  28 #ifdef HAVE_CONFIG_H
  29 # include "config.h"
  30 #endif
  31
  32 #include <vlc_common.h>
  33 #include <vlc_plugin.h>
  34 #include <vlc_interface.h>
  35 #include <vlc_playlist.h>
  36 #include <vlc_charset.h>
  37
  38 #include <assert.h>
  39
  40 #define MODE_TEXT 0
  41 #define MODE_HTML 1
  42 #define MODE_SYSLOG 2
  43
  44 #ifdef __APPLE__
  45 #define LOG_DIR "Library/Logs/"
  46 #endif
  47
  48 #define LOG_FILE_TEXT "vlc-log.txt"
  49 #define LOG_FILE_HTML "vlc-log.html"
  50
  51 #define TEXT_HEADER "-- logger module started --\n"
  52 #define TEXT_FOOTER "-- logger module stopped --\n"
  53
  54 #define HTML_HEADER \
  55     "<!DOCTYPE html PUBLIC \"-//W3C//DTD HTML 4.01//EN\"\n" \
  56     "  \"http://www.w3.org/TR/html4/strict.dtd\">\n" \
  57     "<html>\n" \
  58     "  <head>\n" \
  59     "    <title>vlc log</title>\n" \
  60     "    <meta http-equiv=\"Content-Type\" content=\"text/html; charset=UTF-8\">\n" \
  61     "  </head>\n" \
  62     "  <body style=\"background-color: #000000; color: #aaaaaa;\">\n" \
  63     "    <pre>\n" \
  64     "      <b>-- logger module started --</b>\n"
  65 #define HTML_FOOTER \
  66     "      <b>-- logger module stopped --</b>\n" \
  67     "    </pre>\n" \
  68     "  </body>\n" \
  69     "</html>\n"
  70
  71 #ifdef HAVE_SYSLOG_H
  72 #include <syslog.h>
  73 #endif
  74
  75 struct msg_cb_data_t
  76 {
  77     intf_thread_t *p_intf;
  78     FILE *p_file;
  79     int   i_mode;
  80 };
  81
  82 /*****************************************************************************
  83  * intf_sys_t: description and status of log interface
  84  *****************************************************************************/
  85 struct intf_sys_t
  86 {
  87     msg_subscription_t *p_sub;
  88     msg_cb_data_t msg;
  89 };
  90
  91 /*****************************************************************************
  92  * Local prototypes
  93  *****************************************************************************/
  94 static int  Open    ( vlc_object_t * );
  95 static void Close   ( vlc_object_t * );
  96
  97 static void Overflow (msg_cb_data_t *p_sys, msg_item_t *p_item, unsigned overruns);
  98 static void TextPrint         ( const msg_item_t *, FILE * );
  99 static void HtmlPrint         ( const msg_item_t *, FILE * );
 100 #ifdef HAVE_SYSLOG_H
 101 static void SyslogPrint       ( const msg_item_t *);
 102 #endif
 103
 104 /*****************************************************************************
 105  * Module descriptor
 106  *****************************************************************************/
 107 static const char *const mode_list[] = { "text", "html"
 108 #ifdef HAVE_SYSLOG_H
 109 ,"syslog"
 110 #endif
 111 };
 112 static const char *const mode_list_text[] = { N_("Text"), "HTML"
 113 #ifdef HAVE_SYSLOG_H
 114 , "syslog"
 115 #endif
 116 };
 117
 118 #define LOGMODE_TEXT N_("Log format")
 119 #ifndef HAVE_SYSLOG_H
 120 #define LOGMODE_LONGTEXT N_("Specify the log format. Available choices are " \
 121   "\"text\" (default) and \"html\".")
 122 #else
 123
 124 #define LOGMODE_LONGTEXT N_("Specify the log format. Available choices are " \
 125   "\"text\" (default), \"html\", and \"syslog\" (special mode to send to " \
 126   "syslog instead of file.")
 127
 128 #define SYSLOG_FACILITY_TEXT N_("Syslog facility")
 129 #define SYSLOG_FACILITY_LONGTEXT N_("Select the syslog facility where logs " \
 130   "will be forwarded. Available choices are \"user\" (default), \"daemon\", " \
 131   "and \"local0\" through \"local7\".")
 132
 133 /* First in list is the default facility used. */
 134 #define DEFINE_SYSLOG_FACILITY \
 135   DEF( "user",   LOG_USER ), \
 136   DEF( "daemon", LOG_DAEMON ), \
 137   DEF( "local0", LOG_LOCAL0 ), \
 138   DEF( "local1", LOG_LOCAL1 ), \
 139   DEF( "local2", LOG_LOCAL2 ), \
 140   DEF( "local3", LOG_LOCAL3 ), \
 141   DEF( "local4", LOG_LOCAL4 ), \
 142   DEF( "local5", LOG_LOCAL5 ), \
 143   DEF( "local6", LOG_LOCAL6 ), \
 144   DEF( "local7", LOG_LOCAL7 )
 145
 146 #define DEF( a, b ) a
 147 static const char *const fac_name[]   = { DEFINE_SYSLOG_FACILITY };
 148 #undef  DEF
 149 #define DEF( a, b ) b
 150 static const int         fac_number[] = { DEFINE_SYSLOG_FACILITY };
 151 #undef  DEF
 152 enum                   { fac_entries = sizeof(fac_name)/sizeof(fac_name[0]) };
 153 #undef  DEFINE_SYSLOG_FACILITY
 154
 155 #endif
 156
 157 vlc_module_begin ()
 158     set_shortname( N_( "Logging" ) )
 159     set_description( N_("File logging") )
 160
 161     set_category( CAT_ADVANCED )
 162     set_subcategory( SUBCAT_ADVANCED_MISC )
 163
 164     add_file( "logfile", NULL, NULL,
 165              N_("Log filename"), N_("Specify the log filename."), false )
 166     add_string( "logmode", "text", NULL, LOGMODE_TEXT, LOGMODE_LONGTEXT,
 167                 false )
 168         change_string_list( mode_list, mode_list_text, 0 )
 169 #ifdef HAVE_SYSLOG_H
 170     add_string( "syslog-facility", fac_name[0], NULL, SYSLOG_FACILITY_TEXT,
 171                 SYSLOG_FACILITY_LONGTEXT, true )
 172         change_string_list( fac_name, fac_name, 0 )
 173 #endif
 174
 175     add_obsolete_string( "rrd-file" )
 176
 177     set_capability( "interface", 0 )
 178     set_callbacks( Open, Close )
 179 vlc_module_end ()
 180
 181 /*****************************************************************************
 182  * Open: initialize and create stuff
 183  *****************************************************************************/
 184 static int Open( vlc_object_t *p_this )
 185 {
 186     intf_thread_t *p_intf = (intf_thread_t *)p_this;
 187     intf_sys_t *p_sys;
 188     char *psz_mode;
 189
 190     CONSOLE_INTRO_MSG;
 191     msg_Info( p_intf, "using logger." );
 192
 193     /* Allocate instance and initialize some members */
 194     p_sys = p_intf->p_sys = (intf_sys_t *)malloc( sizeof( intf_sys_t ) );
 195     if( p_sys == NULL )
 196         return VLC_ENOMEM;
 197
 198     p_sys->msg.p_intf = p_intf;
 199     p_sys->msg.i_mode = MODE_TEXT;
 200     psz_mode = var_CreateGetString( p_intf, "logmode" );
 201     if( psz_mode )
 202     {
 203         if( !strcmp( psz_mode, "text" ) )
 204             ;
 205         else if( !strcmp( psz_mode, "html" ) )
 206         {
 207             p_sys->msg.i_mode = MODE_HTML;
 208         }
 209 #ifdef HAVE_SYSLOG_H
 210         else if( !strcmp( psz_mode, "syslog" ) )
 211         {
 212             p_sys->msg.i_mode = MODE_SYSLOG;
 213         }
 214 #endif
 215         else
 216         {
 217             msg_Warn( p_intf, "invalid log mode `%s', using `text'", psz_mode );
 218             p_sys->msg.i_mode = MODE_TEXT;
 219         }
 220         free( psz_mode );
 221     }
 222     else
 223     {
 224         msg_Warn( p_intf, "no log mode specified, using `text'" );
 225     }
 226
 227     if( p_sys->msg.i_mode != MODE_SYSLOG )
 228     {
 229         char *psz_file = config_GetPsz( p_intf, "logfile" );
 230         if( !psz_file )
 231         {
 232 #ifdef __APPLE__
 233             char *home = config_GetUserDir(VLC_DOCUMENTS_DIR);
 234             if( home == NULL
 235              || asprintf( &psz_file, "%s/"LOG_DIR"/%s", home,
 236                 (p_sys->msg.i_mode == MODE_HTML) ? LOG_FILE_HTML
 237                                              : LOG_FILE_TEXT ) == -1 )
 238                 psz_file = NULL;
 239             free(home);
 240 #else
 241             switch( p_sys->msg.i_mode )
 242             {
 243             case MODE_HTML:
 244                 psz_file = strdup( LOG_FILE_HTML );
 245                 break;
 246             case MODE_TEXT:
 247             default:
 248                 psz_file = strdup( LOG_FILE_TEXT );
 249                 break;
 250             }
 251 #endif
 252             msg_Warn( p_intf, "no log filename provided, using `%s'",
 253                                psz_file );
 254         }
 255
 256         /* Open the log file and remove any buffering for the stream */
 257         msg_Dbg( p_intf, "opening logfile `%s'", psz_file );
 258         p_sys->msg.p_file = utf8_fopen( psz_file, "at" );
 259         if( p_sys->msg.p_file == NULL )
 260         {
 261             msg_Err( p_intf, "error opening logfile `%s'", psz_file );
 262             free( p_sys );
 263             free( psz_file );
 264             return -1;
 265         }
 266         setvbuf( p_sys->msg.p_file, NULL, _IONBF, 0 );
 267
 268         free( psz_file );
 269
 270         switch( p_sys->msg.i_mode )
 271         {
 272         case MODE_HTML:
 273             fputs( HTML_HEADER, p_sys->msg.p_file );
 274             break;
 275         case MODE_TEXT:
 276         default:
 277             fputs( TEXT_HEADER, p_sys->msg.p_file );
 278             break;
 279         }
 280
 281     }
 282     else
 283     {
 284         p_sys->msg.p_file = NULL;
 285 #ifdef HAVE_SYSLOG_H
 286         int i_facility;
 287         char *psz_facility = var_CreateGetString( p_intf, "syslog-facility" );
 288         if( psz_facility )
 289         {
 290             bool b_valid = 0;
 291             for( size_t i = 0; i < fac_entries; ++i )
 292             {
 293                 if( !strcmp( psz_facility, fac_name[i] ) )
 294                 {
 295                     i_facility = fac_number[i];
 296                     b_valid = 1;
 297                     break;
 298                 }
 299             }
 300             if( !b_valid )
 301             {
 302                 msg_Warn( p_intf, "invalid syslog facility `%s', using `%s'",
 303                           psz_facility, fac_name[0] );
 304                 i_facility = fac_number[0];
 305             }
 306             free( psz_facility );
 307         }
 308         else
 309         {
 310             msg_Warn( p_intf, "no syslog facility specified, using `%s'",
 311                       fac_name[0] );
 312             i_facility = fac_number[0];
 313         }
 314
 315         openlog( "vlc", LOG_PID|LOG_NDELAY, i_facility );
 316 #endif
 317     }
 318
 319     p_sys->p_sub = msg_Subscribe( p_intf->p_libvlc, Overflow, &p_sys->msg );
 320
 321     return 0;
 322 }
 323
 324 /*****************************************************************************
 325  * Close: destroy interface stuff
 326  *****************************************************************************/
 327 static void Close( vlc_object_t *p_this )
 328 {
 329     intf_thread_t *p_intf = (intf_thread_t *)p_this;
 330     intf_sys_t *p_sys = p_intf->p_sys;
 331
 332     /* Flush the queue and unsubscribe from the message queue */
 333     /* FIXME: flush */
 334     msg_Unsubscribe( p_sys->p_sub );
 335
 336     switch( p_sys->msg.i_mode )
 337     {
 338     case MODE_HTML:
 339         fputs( HTML_FOOTER, p_sys->msg.p_file );
 340         break;
 341 #ifdef HAVE_SYSLOG_H
 342     case MODE_SYSLOG:
 343         closelog();
 344         break;
 345 #endif
 346     case MODE_TEXT:
 347     default:
 348         fputs( TEXT_FOOTER, p_sys->msg.p_file );
 349         break;
 350     }
 351
 352     /* Close the log file */
 353     if( p_sys->msg.p_file )
 354         fclose( p_sys->msg.p_file );
 355
 356     /* Destroy structure */
 357     free( p_sys );
 358 }
 359
 360 /**
 361  * Log a message
 362  */
 363 static void Overflow (msg_cb_data_t *p_sys, msg_item_t *p_item, unsigned overruns)
 364 {
 365     VLC_UNUSED(overruns);
 366     int verbosity = var_CreateGetInteger( p_sys->p_intf, "verbose" );
 367     int priority = 0;
 368
 369     switch( p_item->i_type )
 370     {
 371         case VLC_MSG_WARN: priority = 1; break;
 372         case VLC_MSG_DBG:  priority = 2; break;
 373     }
 374     if (verbosity < priority)
 375         return;
 376
 377     int canc = vlc_savecancel();
 378
 379     switch( p_sys->i_mode )
 380     {
 381         case MODE_HTML:
 382             HtmlPrint( p_item, p_sys->p_file );
 383             break;
 384 #ifdef HAVE_SYSLOG_H
 385         case MODE_SYSLOG:
 386             SyslogPrint( p_item );
 387             break;
 388 #endif
 389         case MODE_TEXT:
 390         default:
 391             TextPrint( p_item, p_sys->p_file );
 392             break;
 393     }
 394
 395     vlc_restorecancel( canc );
 396 }
 397
 398 static const char ppsz_type[4][11] = {
 399     ": ",
 400     " error: ",
 401     " warning: ",
 402     " debug: ",
 403 };
 404
 405 static void TextPrint( const msg_item_t *p_msg, FILE *p_file )
 406 {
 407     fprintf( p_file, "%s%s%s\n", p_msg->psz_module, ppsz_type[p_msg->i_type],
 408              p_msg->psz_msg );
 409 }
 410
 411 #ifdef HAVE_SYSLOG_H
 412 static void SyslogPrint( const msg_item_t *p_msg )
 413 {
 414     static const int i_prio[4] = { LOG_INFO, LOG_ERR, LOG_WARNING, LOG_DEBUG };
 415     int i_priority = i_prio[p_msg->i_type];
 416
 417     if( p_msg->psz_header )
 418         syslog( i_priority, "%s %s%s%s", p_msg->psz_header, p_msg->psz_module,
 419                 ppsz_type[p_msg->i_type], p_msg->psz_msg );
 420     else
 421         syslog( i_priority, "%s%s%s", p_msg->psz_module,
 422                 ppsz_type[p_msg->i_type], p_msg->psz_msg );
 423
 424 }
 425 #endif
 426
 427 static void HtmlPrint( const msg_item_t *p_msg, FILE *p_file )
 428 {
 429     static const char ppsz_color[4][30] = {
 430         "<span style=\"color: #ffffff\">",
 431         "<span style=\"color: #ff6666\">",
 432         "<span style=\"color: #ffff66\">",
 433         "<span style=\"color: #aaaaaa\">",
 434     };
 435
 436     fprintf( p_file, "%s%s%s%s</span>\n", p_msg->psz_module,
 437              ppsz_type[p_msg->i_type], ppsz_color[p_msg->i_type],
 438              p_msg->psz_msg );
 439 }