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# include/pion/error.hpp

    00001 // ---------------------------------------------------------------------
    00002 // pion:  a Boost C++ framework for building lightweight HTTP interfaces
    00003 // ---------------------------------------------------------------------
    00004 // Copyright (C) 2007-2014 Splunk Inc.  (https://github.com/splunk/pion)
    00005 //
    00006 // Distributed under the Boost Software License, Version 1.0.
    00007 // See http://www.boost.org/LICENSE_1_0.txt
    00008 //
    00009
    00010 #ifndef __PION_ERROR_HEADER__
    00011 #define __PION_ERROR_HEADER__
    00012
    00013 #include <string>
    00014 #include <sstream>
    00015 #include <exception>
    00016 #include <boost/version.hpp>
    00017 #include <boost/throw_exception.hpp>
    00018 #include <boost/exception/exception.hpp>
    00019 #include <boost/exception/info.hpp>
    00020 #include <boost/exception/error_info.hpp>
    00021 #include <boost/exception/get_error_info.hpp>
    00022 #if BOOST_VERSION >= 104700
    00023 #include <boost/units/io.hpp>
    00024 #endif
    00025 #include <pion/config.hpp>
    00026
    00027
    00028 namespace pion {    // begin namespace pion
    00029
    00030     //
    00031     // exception: simple exception class for pion errors that generates what()
    00032     // strings with more descriptive messages and optionally arguments as well
    00033     //
    00034     class exception
    00035         : public virtual std::exception, public virtual boost::exception
    00036     {
    00037     public:
    00038         exception() {}
    00039         exception(const std::string& msg) : m_what_msg(msg) {}
    00040         exception(const char * const msg) : m_what_msg(msg) {}
    00041         virtual ~exception() throw () {}
    00042         virtual const char* what() const throw() {
    00043             if (m_what_msg.empty()) update_what_msg();
    00044             return m_what_msg.c_str();
    00045         }
    00046     protected:
    00047         inline void set_what_msg(const char * const msg = NULL, const std::string * const arg1 = NULL, const std::string * const arg2 = NULL, const std::string * const arg3 = NULL) const {
    00048             std::ostringstream tmp;
    00049 #if BOOST_VERSION >= 104700
    00050             tmp << ( msg ? msg : boost::units::detail::demangle(BOOST_EXCEPTION_DYNAMIC_TYPEID(*this).type_->name()) );
    00051 #else
    00052             tmp << ( msg ? msg : boost::units::detail::demangle(BOOST_EXCEPTION_DYNAMIC_TYPEID(*this).type_.name()) );
    00053 #endif
    00054             if (arg1 || arg2 || arg3) tmp << ':';
    00055             if (arg1) tmp << ' ' << *arg1;
    00056             if (arg2) tmp << ' ' << *arg2;
    00057             if (arg3) tmp << ' ' << *arg3;
    00058             m_what_msg = tmp.str();
    00059         }
    00060         virtual void update_what_msg() const { set_what_msg(); }
    00061         mutable std::string m_what_msg;
    00062     };
    00063
    00064
    00071     template <class T>
    00072     static inline std::string
    00073     diagnostic_information( T const & e )
    00074     {
    00075         boost::exception const * const be = dynamic_cast<const boost::exception*>(&e);
    00076         std::exception const * const se = dynamic_cast<const std::exception*>(&e);
    00077         std::ostringstream tmp;
    00078         if (se) {
    00079             tmp << se->what();
    00080         } else {
    00081 #if BOOST_VERSION >= 104700
    00082             tmp << boost::units::detail::demangle(BOOST_EXCEPTION_DYNAMIC_TYPEID(e).type_->name());
    00083 #else
    00084             tmp << boost::units::detail::demangle(BOOST_EXCEPTION_DYNAMIC_TYPEID(e).type_.name());
    00085 #endif
    00086         }
    00087         if (be) {
    00088             //char const * const * fn=boost::get_error_info<boost::throw_function>(*be);
    00089             //if (fn) tmp << " at " << *fn;
    00090             char const * const * f=boost::get_error_info<boost::throw_file>(*be);
    00091             if (f) {
    00092                 tmp << " [" << *f;
    00093                 if (int const * l=boost::get_error_info<boost::throw_line>(*be))
    00094                     tmp << ':' << *l;
    00095                 tmp << "]";
    00096             }
    00097         }
    00098         return tmp.str();
    00099     }
    00100
    00101
    00102     namespace error {    // begin namespace error
    00103
    00104         //
    00105         // pion error info types
    00106         //
    00107
    00109         typedef boost::error_info<struct errinfo_arg_name_,std::string> errinfo_message;
    00110
    00112         typedef boost::error_info<struct errinfo_arg_name_,std::string> errinfo_arg_name;
    00113
    00115         typedef boost::error_info<struct errinfo_file_name_,std::string> errinfo_file_name;
    00116
    00118         typedef boost::error_info<struct errinfo_dir_name_,std::string> errinfo_dir_name;
    00119
    00121         typedef boost::error_info<struct errinfo_plugin_name_,std::string> errinfo_plugin_name;
    00122
    00124         typedef boost::error_info<struct errinfo_dir_name_,std::string> errinfo_symbol_name;
    00125
    00126
    00127         //
    00128         // pion exception types
    00129         //
    00130
    00132         class bad_arg : public pion::exception {
    00133             virtual void update_what_msg() const {
    00134                 set_what_msg("bad argument", boost::get_error_info<errinfo_arg_name>(*this));
    00135             }
    00136         };
    00137
    00139         class bad_config : public pion::exception {
    00140             virtual void update_what_msg() const {
    00141                 set_what_msg("config parser error", boost::get_error_info<errinfo_file_name>(*this));
    00142             }
    00143         };
    00144
    00146         class open_file : public pion::exception {
    00147             virtual void update_what_msg() const {
    00148                 set_what_msg("unable to open file", boost::get_error_info<errinfo_file_name>(*this));
    00149             }
    00150         };
    00151
    00153         class open_plugin : public pion::exception {
    00154             virtual void update_what_msg() const {
    00155                 set_what_msg("unable to open plugin", boost::get_error_info<errinfo_plugin_name>(*this));
    00156             }
    00157         };
    00158
    00160         class read_file : public pion::exception {
    00161             virtual void update_what_msg() const {
    00162                 set_what_msg("unable to read file", boost::get_error_info<errinfo_file_name>(*this));
    00163             }
    00164         };
    00165
    00167         class file_not_found : public pion::exception {
    00168             virtual void update_what_msg() const {
    00169                 set_what_msg("file not found", boost::get_error_info<errinfo_file_name>(*this));
    00170             }
    00171         };
    00172
    00174         class directory_not_found : public pion::exception {
    00175             virtual void update_what_msg() const {
    00176                 set_what_msg("directory not found", boost::get_error_info<errinfo_dir_name>(*this));
    00177             }
    00178         };
    00179
    00181         class plugin_not_found : public pion::exception {
    00182             virtual void update_what_msg() const {
    00183                 set_what_msg("plugin not found", boost::get_error_info<errinfo_plugin_name>(*this));
    00184             }
    00185         };
    00186
    00188         class duplicate_plugin : public pion::exception {
    00189             virtual void update_what_msg() const {
    00190                 set_what_msg("duplicate plugin", boost::get_error_info<errinfo_plugin_name>(*this));
    00191             }
    00192         };
    00193
    00195         class plugin_missing_symbol : public pion::exception {
    00196             virtual void update_what_msg() const {
    00197                 set_what_msg("missing plugin symbol", boost::get_error_info<errinfo_symbol_name>(*this));
    00198             }
    00199         };
    00200
    00202         class plugin_undefined : public pion::exception {
    00203             virtual void update_what_msg() const {
    00204                 set_what_msg("plugin has undefined state");
    00205             }
    00206         };
    00207
    00209         class bad_password_hash : public pion::exception {
    00210             virtual void update_what_msg() const {
    00211                 set_what_msg("bad password hash");
    00212             }
    00213         };
    00214
    00215     }   // end namespace error
    00216
    00217 }   // end namespace pion
    00218
    00219 #endif