138 lines
5.1 KiB
C++
138 lines
5.1 KiB
C++
// Copyright (c) 2022-2023, The Monero Project
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without modification, are
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// permitted provided that the following conditions are met:
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//
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// 1. Redistributions of source code must retain the above copyright notice, this list of
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// conditions and the following disclaimer.
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//
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// 2. Redistributions in binary form must reproduce the above copyright notice, this list
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// of conditions and the following disclaimer in the documentation and/or other
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// materials provided with the distribution.
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//
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// 3. Neither the name of the copyright holder nor the names of its contributors may be
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// used to endorse or promote products derived from this software without specific
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// prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
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// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
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// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#pragma once
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#include <exception>
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#include <system_error>
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#include <type_traits>
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#include "misc_log_ex.h"
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//! Print default `code` message followed by optional message to debug log then throw `code`.
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#define WIRE_DLOG_THROW_(code, ...) \
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do \
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{ \
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MDEBUG( get_string(code) __VA_ARGS__ ); \
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throw ::wire::exception_t<decltype(code)>{code}; \
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} \
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while (0)
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//! Print default `code` message followed by `msg` to debug log then throw `code`.
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#define WIRE_DLOG_THROW(code, msg) \
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WIRE_DLOG_THROW_(code, << ": " << msg)
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namespace wire
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{
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namespace error
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{
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enum class schema : int
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{
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none = 0, //!< Must be zero for `expect<..>`
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array, //!< Expected an array value
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array_max_element,//!< Exceeded max array count
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array_min_size, //!< Below min element wire size
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binary, //!< Expected a binary value of variable length
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boolean, //!< Expected a boolean value
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enumeration, //!< Expected a value from a specific set
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fixed_binary, //!< Expected a binary value of fixed length
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integer, //!< Expected an integer value
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invalid_key, //!< Key for object is invalid
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larger_integer, //!< Expected a larger integer value
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maximum_depth, //!< Hit maximum number of object+array tracking
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missing_key, //!< Missing required key for object
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number, //!< Expected a number (integer or float) value
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object, //!< Expected object value
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smaller_integer, //!< Expected a smaller integer value
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string, //!< Expected string value
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};
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//! \return Error message string.
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const char* get_string(schema value) noexcept;
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//! \return Category for `schema_error`.
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const std::error_category& schema_category() noexcept;
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//! \return Error code with `value` and `schema_category()`.
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inline std::error_code make_error_code(const schema value) noexcept
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{
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return std::error_code{int(value), schema_category()};
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}
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} // error
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//! `std::exception` doesn't require dynamic memory like `std::runtime_error`
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struct exception : std::exception
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{
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exception() noexcept
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: std::exception()
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{}
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exception(const exception&) = default;
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exception& operator=(const exception&) = default;
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virtual ~exception() noexcept
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{}
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virtual std::error_code code() const noexcept = 0;
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};
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template<typename T>
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class exception_t final : public wire::exception
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{
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static_assert(std::is_enum<T>(), "only enumerated types allowed");
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T value;
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public:
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exception_t(T value) noexcept
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: value(value)
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{}
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exception_t(const exception_t&) = default;
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~exception_t() = default;
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exception_t& operator=(const exception_t&) = default;
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const char* what() const noexcept override final
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{
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static_assert(noexcept(noexcept(get_string(value))), "get_string function must be noexcept");
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return get_string(value);
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}
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std::error_code code() const noexcept override final
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{
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static_assert(noexcept(noexcept(make_error_code(value))), "make_error_code funcion must be noexcept");
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return make_error_code(value);
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}
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};
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} // wire
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namespace std
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{
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template<>
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struct is_error_code_enum<wire::error::schema>
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: true_type
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{};
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}
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