ceph/src/boost/libs/log/src/setup/init_from_settings.cpp

   1 /*
   2  *          Copyright Andrey Semashev 2007 - 2015.
   3  * Distributed under the Boost Software License, Version 1.0.
   4  *    (See accompanying file LICENSE_1_0.txt or copy at
   5  *          http://www.boost.org/LICENSE_1_0.txt)
   6  */
   7 /*!
   8  * \file   init_from_settings.cpp
   9  * \author Andrey Semashev
  10  * \date   11.10.2009
  11  *
  12  * \brief  This header is the Boost.Log library implementation, see the library documentation
  13  *         at http://www.boost.org/doc/libs/release/libs/log/doc/html/index.html.
  14  */
  15
  16 #ifndef BOOST_LOG_WITHOUT_SETTINGS_PARSERS
  17
  18 #if defined(__GNUC__) && !(defined(__INTEL_COMPILER) || defined(__ICL) || defined(__ICC) || defined(__ECC)) \
  19     && (__GNUC__ * 100 + __GNUC_MINOR__) >= 407
  20 // This warning is caused by a compiler bug which is exposed when boost::optional is used: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=47679
  21 // It has to be disabled here, before any code is included, since otherwise it doesn't help and the warning is still emitted.
  22 // '*((void*)& foo +2)' may be used uninitialized in this function
  23 #pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
  24 #endif
  25
  26 #include <boost/log/detail/setup_config.hpp>
  27 #include <cstddef>
  28 #include <ios>
  29 #include <map>
  30 #include <vector>
  31 #include <string>
  32 #include <utility>
  33 #include <iostream>
  34 #include <typeinfo>
  35 #include <stdexcept>
  36 #include <algorithm>
  37 #include <boost/type.hpp>
  38 #include <boost/bind.hpp>
  39 #include <boost/limits.hpp>
  40 #include <boost/cstdint.hpp>
  41 #include <boost/smart_ptr/make_shared_object.hpp>
  42 #include <boost/core/null_deleter.hpp>
  43 #include <boost/optional/optional.hpp>
  44 #include <boost/filesystem/path.hpp>
  45 #include <boost/date_time/date_defs.hpp>
  46 #include <boost/property_tree/ptree.hpp>
  47 #include <boost/mpl/if.hpp>
  48 #include <boost/type_traits/is_unsigned.hpp>
  49 #include <boost/spirit/home/qi/numeric/numeric_utils.hpp>
  50 #include <boost/log/detail/code_conversion.hpp>
  51 #include <boost/log/detail/singleton.hpp>
  52 #include <boost/log/detail/default_attribute_names.hpp>
  53 #include <boost/log/core.hpp>
  54 #include <boost/log/sinks.hpp>
  55 #include <boost/log/exceptions.hpp>
  56 #include <boost/log/sinks/frontend_requirements.hpp>
  57 #include <boost/log/expressions/filter.hpp>
  58 #include <boost/log/expressions/formatter.hpp>
  59 #include <boost/log/utility/string_literal.hpp>
  60 #include <boost/log/utility/functional/nop.hpp>
  61 #include <boost/log/utility/setup/from_settings.hpp>
  62 #include <boost/log/utility/setup/filter_parser.hpp>
  63 #include <boost/log/utility/setup/formatter_parser.hpp>
  64 #if !defined(BOOST_LOG_NO_ASIO)
  65 #include <boost/asio/ip/address.hpp>
  66 #endif
  67 #if !defined(BOOST_LOG_NO_THREADS)
  68 #include <boost/log/detail/locks.hpp>
  69 #include <boost/log/detail/light_rw_mutex.hpp>
  70 #endif
  71 #include "parser_utils.hpp"
  72 #include "spirit_encoding.hpp"
  73 #include <boost/log/detail/header.hpp>
  74
  75 namespace qi = boost::spirit::qi;
  76
  77 namespace boost {
  78
  79 BOOST_LOG_OPEN_NAMESPACE
  80
  81 BOOST_LOG_ANONYMOUS_NAMESPACE {
  82
  83 //! Throws an exception when a parameter value is not valid
  84 BOOST_LOG_NORETURN void throw_invalid_value(const char* param_name)
  85 {
  86     std::string descr = std::string("Invalid parameter \"")
  87                         + param_name
  88                         + "\" value";
  89     BOOST_LOG_THROW_DESCR(invalid_value, descr);
  90 }
  91
  92 //! Extracts an integral value from parameter value
  93 template< typename IntT, typename CharT >
  94 inline IntT param_cast_to_int(const char* param_name, std::basic_string< CharT > const& value)
  95 {
  96     IntT res = 0;
  97     typedef typename mpl::if_<
  98         is_unsigned< IntT >,
  99         qi::extract_uint< IntT, 10, 1, -1 >,
 100         qi::extract_int< IntT, 10, 1, -1 >
 101     >::type extract;
 102     const CharT* begin = value.c_str(), *end = begin + value.size();
 103     if (extract::call(begin, end, res) && begin == end)
 104         return res;
 105     else
 106         throw_invalid_value(param_name);
 107 }
 108
 109 //! Case-insensitive character comparison predicate
 110 struct is_case_insensitive_equal
 111 {
 112     typedef bool result_type;
 113
 114     template< typename CharT >
 115     result_type operator() (CharT left, CharT right) const BOOST_NOEXCEPT
 116     {
 117         typedef typename boost::log::aux::encoding< CharT >::type encoding;
 118         return encoding::tolower(left) == encoding::tolower(right);
 119     }
 120 };
 121
 122 //! Extracts a boolean value from parameter value
 123 template< typename CharT >
 124 inline bool param_cast_to_bool(const char* param_name, std::basic_string< CharT > const& value)
 125 {
 126     typedef CharT char_type;
 127     typedef boost::log::aux::char_constants< char_type > constants;
 128     typedef boost::log::basic_string_literal< char_type > literal_type;
 129
 130     const char_type* begin = value.c_str(), *end = begin + value.size();
 131     std::size_t len = end - begin;
 132
 133     literal_type keyword = constants::true_keyword();
 134     if (keyword.size() == len && std::equal(begin, end, keyword.c_str(), is_case_insensitive_equal()))
 135     {
 136         return true;
 137     }
 138     else
 139     {
 140         keyword = constants::false_keyword();
 141         if (keyword.size() == len && std::equal(begin, end, keyword.c_str(), is_case_insensitive_equal()))
 142         {
 143             return false;
 144         }
 145         else
 146         {
 147             return param_cast_to_int< unsigned int >(param_name, value) != 0;
 148         }
 149     }
 150 }
 151
 152 #if !defined(BOOST_LOG_NO_ASIO)
 153 //! Extracts a network address from parameter value
 154 template< typename CharT >
 155 inline std::string param_cast_to_address(const char* param_name, std::basic_string< CharT > const& value)
 156 {
 157     return log::aux::to_narrow(value);
 158 }
 159 #endif // !defined(BOOST_LOG_NO_ASIO)
 160
 161 template< typename CharT >
 162 inline bool is_weekday(const CharT* str, std::size_t len, boost::log::basic_string_literal< CharT > const& weekday, boost::log::basic_string_literal< CharT > const& short_weekday)
 163 {
 164     return (len == weekday.size() && std::equal(weekday.begin(), weekday.end(), str)) ||
 165         (len == short_weekday.size() && std::equal(short_weekday.begin(), short_weekday.end(), str));
 166 }
 167
 168 //! The function extracts the file rotation time point predicate from the parameter
 169 template< typename CharT >
 170 sinks::file::rotation_at_time_point param_cast_to_rotation_time_point(const char* param_name, std::basic_string< CharT > const& value)
 171 {
 172     typedef CharT char_type;
 173     typedef boost::log::aux::char_constants< char_type > constants;
 174     typedef typename boost::log::aux::encoding< char_type >::type encoding;
 175     typedef qi::extract_uint< unsigned short, 10, 1, 2 > day_extract;
 176     typedef qi::extract_uint< unsigned char, 10, 2, 2 > time_component_extract;
 177
 178     const char_type colon = static_cast< char_type >(':');
 179     optional< date_time::weekdays > weekday;
 180     optional< unsigned short > day;
 181     unsigned char hour = 0, minute = 0, second = 0;
 182     const char_type* begin = value.c_str(), *end = begin + value.size();
 183
 184     if (!encoding::isalnum(*begin)) // begin is null-terminated, so we also check that the string is not empty here
 185         throw_invalid_value(param_name);
 186
 187     const char_type* p = begin + 1;
 188     if (encoding::isalpha(*begin))
 189     {
 190         // This must be a weekday
 191         while (encoding::isalpha(*p))
 192             ++p;
 193
 194         std::size_t len = p - begin;
 195         if (is_weekday(begin, len, constants::monday_keyword(), constants::short_monday_keyword()))
 196             weekday = date_time::Monday;
 197         else if (is_weekday(begin, len, constants::tuesday_keyword(), constants::short_tuesday_keyword()))
 198             weekday = date_time::Tuesday;
 199         else if (is_weekday(begin, len, constants::wednesday_keyword(), constants::short_wednesday_keyword()))
 200             weekday = date_time::Wednesday;
 201         else if (is_weekday(begin, len, constants::thursday_keyword(), constants::short_thursday_keyword()))
 202             weekday = date_time::Thursday;
 203         else if (is_weekday(begin, len, constants::friday_keyword(), constants::short_friday_keyword()))
 204             weekday = date_time::Friday;
 205         else if (is_weekday(begin, len, constants::saturday_keyword(), constants::short_saturday_keyword()))
 206             weekday = date_time::Saturday;
 207         else if (is_weekday(begin, len, constants::sunday_keyword(), constants::short_sunday_keyword()))
 208             weekday = date_time::Sunday;
 209         else
 210             throw_invalid_value(param_name);
 211     }
 212     else
 213     {
 214         // This may be either a month day or an hour
 215         while (encoding::isdigit(*p))
 216             ++p;
 217
 218         if (encoding::isspace(*p))
 219         {
 220             // This is a month day
 221             unsigned short mday = 0;
 222             const char_type* b = begin;
 223             if (!day_extract::call(b, p, mday) || b != p)
 224                 throw_invalid_value(param_name);
 225
 226             day = mday;
 227         }
 228         else if (*p == colon)
 229         {
 230             // This is an hour, reset the pointer
 231             p = begin;
 232         }
 233         else
 234             throw_invalid_value(param_name);
 235     }
 236
 237     // Skip spaces
 238     while (encoding::isspace(*p))
 239         ++p;
 240
 241     // Parse hour
 242     if (!time_component_extract::call(p, end, hour) || *p != colon)
 243         throw_invalid_value(param_name);
 244     ++p;
 245
 246     // Parse minute
 247     if (!time_component_extract::call(p, end, minute) || *p != colon)
 248         throw_invalid_value(param_name);
 249     ++p;
 250
 251     // Parse second
 252     if (!time_component_extract::call(p, end, second) || p != end)
 253         throw_invalid_value(param_name);
 254
 255     // Construct the predicate
 256     if (weekday)
 257         return sinks::file::rotation_at_time_point(weekday.get(), hour, minute, second);
 258     else if (day)
 259         return sinks::file::rotation_at_time_point(gregorian::greg_day(day.get()), hour, minute, second);
 260     else
 261         return sinks::file::rotation_at_time_point(hour, minute, second);
 262 }
 263
 264 //! Base class for default sink factories
 265 template< typename CharT >
 266 class basic_default_sink_factory :
 267     public sink_factory< CharT >
 268 {
 269 public:
 270     typedef sink_factory< CharT > base_type;
 271     typedef typename base_type::char_type char_type;
 272     typedef typename base_type::string_type string_type;
 273     typedef typename base_type::settings_section settings_section;
 274     typedef boost::log::aux::char_constants< char_type > constants;
 275
 276 protected:
 277     //! Sink backend character selection function
 278     template< typename InitializerT >
 279     static shared_ptr< sinks::sink > select_backend_character_type(settings_section const& params, InitializerT initializer)
 280     {
 281 #if defined(BOOST_LOG_USE_CHAR) && defined(BOOST_LOG_USE_WCHAR_T)
 282         if (optional< string_type > wide_param = params["Wide"])
 283         {
 284             if (param_cast_to_bool("Wide", wide_param.get()))
 285                 return initializer(params, type< wchar_t >());
 286         }
 287
 288         return initializer(params, type< char >());
 289 #elif defined(BOOST_LOG_USE_CHAR)
 290         return initializer(params, type< char >());
 291 #elif defined(BOOST_LOG_USE_WCHAR_T)
 292         return initializer(params, type< wchar_t >());
 293 #endif
 294     }
 295
 296     //! The function initializes common parameters of a formatting sink and returns the constructed sink
 297     template< typename BackendT >
 298     static shared_ptr< sinks::sink > init_sink(shared_ptr< BackendT > const& backend, settings_section const& params)
 299     {
 300         typedef BackendT backend_t;
 301         typedef typename sinks::has_requirement<
 302             typename backend_t::frontend_requirements,
 303             sinks::formatted_records
 304         >::type is_formatting_t;
 305
 306         // Filter
 307         filter filt;
 308         if (optional< string_type > filter_param = params["Filter"])
 309         {
 310             filt = parse_filter(filter_param.get());
 311         }
 312
 313         shared_ptr< sinks::basic_sink_frontend > p;
 314
 315 #if !defined(BOOST_LOG_NO_THREADS)
 316         // Asynchronous. TODO: make it more flexible.
 317         bool async = false;
 318         if (optional< string_type > async_param = params["Asynchronous"])
 319         {
 320             async = param_cast_to_bool("Asynchronous", async_param.get());
 321         }
 322
 323         // Construct the frontend, considering Asynchronous parameter
 324         if (!async)
 325         {
 326             p = init_formatter(boost::make_shared< sinks::synchronous_sink< backend_t > >(backend), params, is_formatting_t());
 327         }
 328         else
 329         {
 330             p = init_formatter(boost::make_shared< sinks::asynchronous_sink< backend_t > >(backend), params, is_formatting_t());
 331
 332             // https://svn.boost.org/trac/boost/ticket/10638
 333             // The user doesn't have a way to process excaptions from the dedicated thread anyway, so just suppress them instead of
 334             // terminating the application.
 335             p->set_exception_handler(nop());
 336         }
 337 #else
 338         // When multithreading is disabled we always use the unlocked sink frontend
 339         p = init_formatter(boost::make_shared< sinks::unlocked_sink< backend_t > >(backend), params, is_formatting_t());
 340 #endif
 341
 342         p->set_filter(filt);
 343
 344         return p;
 345     }
 346
 347 private:
 348     //! The function initializes formatter for the sinks that support formatting
 349     template< typename SinkT >
 350     static shared_ptr< SinkT > init_formatter(shared_ptr< SinkT > const& sink, settings_section const& params, mpl::true_)
 351     {
 352         // Formatter
 353         if (optional< string_type > format_param = params["Format"])
 354         {
 355             typedef typename SinkT::char_type sink_char_type;
 356             std::basic_string< sink_char_type > format_str;
 357             log::aux::code_convert(format_param.get(), format_str);
 358             sink->set_formatter(parse_formatter(format_str));
 359         }
 360         return sink;
 361     }
 362     template< typename SinkT >
 363     static shared_ptr< SinkT > init_formatter(shared_ptr< SinkT > const& sink, settings_section const& params, mpl::false_)
 364     {
 365         return sink;
 366     }
 367 };
 368
 369 //! Default console sink factory
 370 template< typename CharT >
 371 class default_console_sink_factory :
 372     public basic_default_sink_factory< CharT >
 373 {
 374 public:
 375     typedef basic_default_sink_factory< CharT > base_type;
 376     typedef typename base_type::char_type char_type;
 377     typedef typename base_type::string_type string_type;
 378     typedef typename base_type::settings_section settings_section;
 379     typedef typename base_type::constants constants;
 380
 381 private:
 382     struct impl;
 383     friend struct impl;
 384     struct impl
 385     {
 386         typedef shared_ptr< sinks::sink > result_type;
 387
 388         template< typename BackendCharT >
 389         result_type operator() (settings_section const& params, type< BackendCharT >) const
 390         {
 391             // Construct the backend
 392             typedef boost::log::aux::char_constants< BackendCharT > constants;
 393             typedef sinks::basic_text_ostream_backend< BackendCharT > backend_t;
 394             shared_ptr< backend_t > backend = boost::make_shared< backend_t >();
 395             backend->add_stream(shared_ptr< typename backend_t::stream_type >(&constants::get_console_log_stream(), boost::null_deleter()));
 396
 397             // Auto flush
 398             if (optional< string_type > auto_flush_param = params["AutoFlush"])
 399             {
 400                 backend->auto_flush(param_cast_to_bool("AutoFlush", auto_flush_param.get()));
 401             }
 402
 403             return base_type::init_sink(backend, params);
 404         }
 405     };
 406
 407 public:
 408     //! The function constructs a sink that writes log records to the console
 409     shared_ptr< sinks::sink > create_sink(settings_section const& params)
 410     {
 411         return base_type::select_backend_character_type(params, impl());
 412     }
 413 };
 414
 415 //! Default text file sink factory
 416 template< typename CharT >
 417 class default_text_file_sink_factory :
 418     public basic_default_sink_factory< CharT >
 419 {
 420 public:
 421     typedef basic_default_sink_factory< CharT > base_type;
 422     typedef typename base_type::char_type char_type;
 423     typedef typename base_type::string_type string_type;
 424     typedef typename base_type::settings_section settings_section;
 425     typedef typename base_type::constants constants;
 426
 427 public:
 428     //! The function constructs a sink that writes log records to a text file
 429     shared_ptr< sinks::sink > create_sink(settings_section const& params)
 430     {
 431         typedef sinks::text_file_backend backend_t;
 432         shared_ptr< backend_t > backend = boost::make_shared< backend_t >();
 433
 434         // FileName
 435         if (optional< string_type > file_name_param = params["FileName"])
 436         {
 437             backend->set_file_name_pattern(filesystem::path(file_name_param.get()));
 438         }
 439         else
 440             BOOST_LOG_THROW_DESCR(missing_value, "File name is not specified");
 441
 442         // File rotation size
 443         if (optional< string_type > rotation_size_param = params["RotationSize"])
 444         {
 445             backend->set_rotation_size(param_cast_to_int< uintmax_t >("RotationSize", rotation_size_param.get()));
 446         }
 447
 448         // File rotation interval
 449         if (optional< string_type > rotation_interval_param = params["RotationInterval"])
 450         {
 451             backend->set_time_based_rotation(sinks::file::rotation_at_time_interval(
 452                 posix_time::seconds(param_cast_to_int< unsigned int >("RotationInterval", rotation_interval_param.get()))));
 453         }
 454         else if (optional< string_type > rotation_time_point_param = params["RotationTimePoint"])
 455         {
 456             // File rotation time point
 457             backend->set_time_based_rotation(param_cast_to_rotation_time_point("RotationTimePoint", rotation_time_point_param.get()));
 458         }
 459
 460         // Auto flush
 461         if (optional< string_type > auto_flush_param = params["AutoFlush"])
 462         {
 463             backend->auto_flush(param_cast_to_bool("AutoFlush", auto_flush_param.get()));
 464         }
 465
 466         // Append
 467         if (optional< string_type > append_param = params["Append"])
 468         {
 469             if (param_cast_to_bool("Append", append_param.get()))
 470                 backend->set_open_mode(std::ios_base::out | std::ios_base::app);
 471         }
 472
 473         // File collector parameters
 474         // Target directory
 475         if (optional< string_type > target_param = params["Target"])
 476         {
 477             filesystem::path target_dir(target_param.get());
 478
 479             // Max total size
 480             uintmax_t max_size = (std::numeric_limits< uintmax_t >::max)();
 481             if (optional< string_type > max_size_param = params["MaxSize"])
 482                 max_size = param_cast_to_int< uintmax_t >("MaxSize", max_size_param.get());
 483
 484             // Min free space
 485             uintmax_t space = 0;
 486             if (optional< string_type > min_space_param = params["MinFreeSpace"])
 487                 space = param_cast_to_int< uintmax_t >("MinFreeSpace", min_space_param.get());
 488
 489             // Max number of files
 490             uintmax_t max_files = (std::numeric_limits< uintmax_t >::max)();
 491             if (optional< string_type > max_files_param = params["MaxFiles"])
 492                 max_files = param_cast_to_int< uintmax_t >("MaxFiles", max_files_param.get());
 493
 494             backend->set_file_collector(sinks::file::make_collector(
 495                 keywords::target = target_dir,
 496                 keywords::max_size = max_size,
 497                 keywords::min_free_space = space,
 498                 keywords::max_files = max_files));
 499
 500             // Scan for log files
 501             if (optional< string_type > scan_param = params["ScanForFiles"])
 502             {
 503                 string_type const& value = scan_param.get();
 504                 if (value == constants::scan_method_all())
 505                     backend->scan_for_files(sinks::file::scan_all);
 506                 else if (value == constants::scan_method_matching())
 507                     backend->scan_for_files(sinks::file::scan_matching);
 508                 else
 509                 {
 510                     BOOST_LOG_THROW_DESCR(invalid_value,
 511                         "File scan method \"" + boost::log::aux::to_narrow(value) + "\" is not supported");
 512                 }
 513             }
 514         }
 515
 516         return base_type::init_sink(backend, params);
 517     }
 518 };
 519
 520 #ifndef BOOST_LOG_WITHOUT_SYSLOG
 521
 522 //! Default syslog sink factory
 523 template< typename CharT >
 524 class default_syslog_sink_factory :
 525     public basic_default_sink_factory< CharT >
 526 {
 527 public:
 528     typedef basic_default_sink_factory< CharT > base_type;
 529     typedef typename base_type::char_type char_type;
 530     typedef typename base_type::string_type string_type;
 531     typedef typename base_type::settings_section settings_section;
 532     typedef typename base_type::constants constants;
 533
 534 public:
 535     //! The function constructs a sink that writes log records to syslog
 536     shared_ptr< sinks::sink > create_sink(settings_section const& params)
 537     {
 538         // Construct the backend
 539         typedef sinks::syslog_backend backend_t;
 540         shared_ptr< backend_t > backend = boost::make_shared< backend_t >();
 541
 542         // For now we use only the default level mapping. Will add support for configuration later.
 543         backend->set_severity_mapper(sinks::syslog::direct_severity_mapping< >(log::aux::default_attribute_names::severity()));
 544
 545 #if !defined(BOOST_LOG_NO_ASIO)
 546         // Setup local and remote addresses
 547         if (optional< string_type > local_address_param = params["LocalAddress"])
 548             backend->set_local_address(param_cast_to_address("LocalAddress", local_address_param.get()));
 549
 550         if (optional< string_type > target_address_param = params["TargetAddress"])
 551             backend->set_target_address(param_cast_to_address("TargetAddress", target_address_param.get()));
 552 #endif // !defined(BOOST_LOG_NO_ASIO)
 553
 554         return base_type::init_sink(backend, params);
 555     }
 556 };
 557
 558 #endif // !defined(BOOST_LOG_WITHOUT_SYSLOG)
 559
 560 #ifndef BOOST_LOG_WITHOUT_DEBUG_OUTPUT
 561
 562 //! Default debugger sink factory
 563 template< typename CharT >
 564 class default_debugger_sink_factory :
 565     public basic_default_sink_factory< CharT >
 566 {
 567 public:
 568     typedef basic_default_sink_factory< CharT > base_type;
 569     typedef typename base_type::char_type char_type;
 570     typedef typename base_type::string_type string_type;
 571     typedef typename base_type::settings_section settings_section;
 572     typedef typename base_type::constants constants;
 573
 574 private:
 575     struct impl;
 576     friend struct impl;
 577     struct impl
 578     {
 579         typedef shared_ptr< sinks::sink > result_type;
 580
 581         template< typename BackendCharT >
 582         result_type operator() (settings_section const& params, type< BackendCharT >) const
 583         {
 584             // Construct the backend
 585             typedef sinks::basic_debug_output_backend< BackendCharT > backend_t;
 586             shared_ptr< backend_t > backend = boost::make_shared< backend_t >();
 587
 588             return base_type::init_sink(backend, params);
 589         }
 590     };
 591
 592 public:
 593     //! The function constructs a sink that writes log records to the debugger
 594     shared_ptr< sinks::sink > create_sink(settings_section const& params)
 595     {
 596         return base_type::select_backend_character_type(params, impl());
 597     }
 598 };
 599
 600 #endif // !defined(BOOST_LOG_WITHOUT_DEBUG_OUTPUT)
 601
 602 #ifndef BOOST_LOG_WITHOUT_EVENT_LOG
 603
 604 //! Default simple event log sink factory
 605 template< typename CharT >
 606 class default_simple_event_log_sink_factory :
 607     public basic_default_sink_factory< CharT >
 608 {
 609 public:
 610     typedef basic_default_sink_factory< CharT > base_type;
 611     typedef typename base_type::char_type char_type;
 612     typedef typename base_type::string_type string_type;
 613     typedef typename base_type::settings_section settings_section;
 614     typedef typename base_type::constants constants;
 615
 616 private:
 617     struct impl;
 618     friend struct impl;
 619     struct impl
 620     {
 621         typedef shared_ptr< sinks::sink > result_type;
 622
 623         template< typename BackendCharT >
 624         result_type operator() (settings_section const& params, type< BackendCharT >) const
 625         {
 626             typedef sinks::basic_simple_event_log_backend< BackendCharT > backend_t;
 627             typedef typename backend_t::string_type backend_string_type;
 628
 629             // Determine the log name
 630             backend_string_type log_name;
 631             if (optional< string_type > log_name_param = params["LogName"])
 632                 log::aux::code_convert(log_name_param.get(), log_name);
 633             else
 634                 log_name = backend_t::get_default_log_name();
 635
 636             // Determine the log source name
 637             backend_string_type source_name;
 638             if (optional< string_type > log_source_param = params["LogSource"])
 639                 log::aux::code_convert(log_source_param.get(), source_name);
 640             else
 641                 source_name = backend_t::get_default_source_name();
 642
 643             // Determine the registration mode
 644             sinks::event_log::registration_mode reg_mode = sinks::event_log::on_demand;
 645             if (optional< string_type > registration_param = params["Registration"])
 646             {
 647                 string_type const& value = registration_param.get();
 648                 if (value == constants::registration_never())
 649                     reg_mode = sinks::event_log::never;
 650                 else if (value == constants::registration_on_demand())
 651                     reg_mode = sinks::event_log::on_demand;
 652                 else if (value == constants::registration_forced())
 653                     reg_mode = sinks::event_log::forced;
 654                 else
 655                 {
 656                     BOOST_LOG_THROW_DESCR(invalid_value,
 657                         "The registration mode \"" + log::aux::to_narrow(value) + "\" is not supported");
 658                 }
 659             }
 660
 661             // Construct the backend
 662             shared_ptr< backend_t > backend(boost::make_shared< backend_t >((
 663                 keywords::log_name = log_name,
 664                 keywords::log_source = source_name,
 665                 keywords::registration = reg_mode)));
 666
 667             // For now we use only the default event type mapping. Will add support for configuration later.
 668             backend->set_event_type_mapper(sinks::event_log::direct_event_type_mapping< >(log::aux::default_attribute_names::severity()));
 669
 670             return base_type::init_sink(backend, params);
 671         }
 672     };
 673
 674 public:
 675     //! The function constructs a sink that writes log records to the Windows NT Event Log
 676     shared_ptr< sinks::sink > create_sink(settings_section const& params)
 677     {
 678         return base_type::select_backend_character_type(params, impl());
 679     }
 680 };
 681
 682 #endif // !defined(BOOST_LOG_WITHOUT_EVENT_LOG)
 683
 684
 685 //! The supported sinks repository
 686 template< typename CharT >
 687 struct sinks_repository :
 688     public log::aux::lazy_singleton< sinks_repository< CharT > >
 689 {
 690     typedef log::aux::lazy_singleton< sinks_repository< CharT > > base_type;
 691
 692 #if !defined(BOOST_LOG_BROKEN_FRIEND_TEMPLATE_SPECIALIZATIONS)
 693     friend class log::aux::lazy_singleton< sinks_repository< CharT > >;
 694 #else
 695     friend class base_type;
 696 #endif
 697
 698     typedef CharT char_type;
 699     typedef std::basic_string< char_type > string_type;
 700     typedef basic_settings_section< char_type > settings_section;
 701     typedef boost::log::aux::char_constants< char_type > constants;
 702     typedef boost::shared_ptr< sink_factory< char_type > > sink_factory_ptr;
 703     typedef std::map< std::string, sink_factory_ptr > sink_factories;
 704
 705 #if !defined(BOOST_LOG_NO_THREADS)
 706     //! Synchronization mutex
 707     log::aux::light_rw_mutex m_Mutex;
 708 #endif
 709     //! Map of the sink factories
 710     sink_factories m_Factories;
 711
 712     //! The function constructs a sink from the settings
 713     shared_ptr< sinks::sink > construct_sink_from_settings(settings_section const& params)
 714     {
 715         typedef typename settings_section::const_reference param_const_reference;
 716         if (param_const_reference dest_node = params["Destination"])
 717         {
 718             std::string dest = log::aux::to_narrow(dest_node.get().get());
 719
 720             BOOST_LOG_EXPR_IF_MT(log::aux::shared_lock_guard< log::aux::light_rw_mutex > lock(m_Mutex);)
 721             typename sink_factories::const_iterator it = m_Factories.find(dest);
 722             if (it != m_Factories.end())
 723             {
 724                 return it->second->create_sink(params);
 725             }
 726             else
 727             {
 728                 BOOST_LOG_THROW_DESCR(invalid_value, "The sink destination is not supported: " + dest);
 729             }
 730         }
 731         else
 732         {
 733             BOOST_LOG_THROW_DESCR(missing_value, "The sink destination is not set");
 734         }
 735     }
 736
 737     static void init_instance()
 738     {
 739         sinks_repository& instance = base_type::get_instance();
 740         instance.m_Factories["TextFile"] = boost::make_shared< default_text_file_sink_factory< char_type > >();
 741         instance.m_Factories["Console"] = boost::make_shared< default_console_sink_factory< char_type > >();
 742 #ifndef BOOST_LOG_WITHOUT_SYSLOG
 743         instance.m_Factories["Syslog"] = boost::make_shared< default_syslog_sink_factory< char_type > >();
 744 #endif
 745 #ifndef BOOST_LOG_WITHOUT_DEBUG_OUTPUT
 746         instance.m_Factories["Debugger"] = boost::make_shared< default_debugger_sink_factory< char_type > >();
 747 #endif
 748 #ifndef BOOST_LOG_WITHOUT_EVENT_LOG
 749         instance.m_Factories["SimpleEventLog"] = boost::make_shared< default_simple_event_log_sink_factory< char_type > >();
 750 #endif
 751     }
 752
 753 private:
 754     sinks_repository() {}
 755 };
 756
 757 //! The function applies the settings to the logging core
 758 template< typename CharT >
 759 void apply_core_settings(basic_settings_section< CharT > const& params)
 760 {
 761     typedef CharT char_type;
 762     typedef std::basic_string< char_type > string_type;
 763
 764     core_ptr core = boost::log::core::get();
 765
 766     // Filter
 767     if (optional< string_type > filter_param = params["Filter"])
 768         core->set_filter(parse_filter(filter_param.get()));
 769     else
 770         core->reset_filter();
 771
 772     // DisableLogging
 773     if (optional< string_type > disable_logging_param = params["DisableLogging"])
 774         core->set_logging_enabled(!param_cast_to_bool("DisableLogging", disable_logging_param.get()));
 775     else
 776         core->set_logging_enabled(true);
 777 }
 778
 779 } // namespace
 780
 781
 782 //! The function initializes the logging library from a settings container
 783 template< typename CharT >
 784 BOOST_LOG_SETUP_API void init_from_settings(basic_settings_section< CharT > const& setts)
 785 {
 786     typedef basic_settings_section< CharT > section;
 787     typedef typename section::char_type char_type;
 788     typedef sinks_repository< char_type > sinks_repo_t;
 789
 790     // Apply core settings
 791     if (section core_params = setts["Core"])
 792         apply_core_settings(core_params);
 793
 794     // Construct and initialize sinks
 795     if (section sink_params = setts["Sinks"])
 796     {
 797         sinks_repo_t& sinks_repo = sinks_repo_t::get();
 798         std::vector< shared_ptr< sinks::sink > > new_sinks;
 799
 800         for (typename section::const_iterator it = sink_params.begin(), end = sink_params.end(); it != end; ++it)
 801         {
 802             section sink_params = *it;
 803
 804             // Ignore empty sections as they are most likely individual parameters (which should not be here anyway)
 805             if (!sink_params.empty())
 806             {
 807                 new_sinks.push_back(sinks_repo.construct_sink_from_settings(sink_params));
 808             }
 809         }
 810
 811         std::for_each(new_sinks.begin(), new_sinks.end(), boost::bind(&core::add_sink, core::get(), _1));
 812     }
 813 }
 814
 815
 816 //! The function registers a factory for a sink
 817 template< typename CharT >
 818 BOOST_LOG_SETUP_API void register_sink_factory(const char* sink_name, shared_ptr< sink_factory< CharT > > const& factory)
 819 {
 820     sinks_repository< CharT >& repo = sinks_repository< CharT >::get();
 821     BOOST_LOG_EXPR_IF_MT(lock_guard< log::aux::light_rw_mutex > lock(repo.m_Mutex);)
 822     repo.m_Factories[sink_name] = factory;
 823 }
 824
 825 #ifdef BOOST_LOG_USE_CHAR
 826 template BOOST_LOG_SETUP_API void register_sink_factory< char >(const char* sink_name, shared_ptr< sink_factory< char > > const& factory);
 827 template BOOST_LOG_SETUP_API void init_from_settings< char >(basic_settings_section< char > const& setts);
 828 #endif
 829
 830 #ifdef BOOST_LOG_USE_WCHAR_T
 831 template BOOST_LOG_SETUP_API void register_sink_factory< wchar_t >(const char* sink_name, shared_ptr< sink_factory< wchar_t > > const& factory);
 832 template BOOST_LOG_SETUP_API void init_from_settings< wchar_t >(basic_settings_section< wchar_t > const& setts);
 833 #endif
 834
 835 BOOST_LOG_CLOSE_NAMESPACE // namespace log
 836
 837 } // namespace boost
 838
 839 #include <boost/log/detail/footer.hpp>
 840
 841 #endif // BOOST_LOG_WITHOUT_SETTINGS_PARSERS