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Write interface for new serialization system

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Lee *!* Clagett 1 year ago
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51
contrib/epee/include/serialization/wire.h
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// Copyright (c) 2021-2023, The Monero Project
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without modification, are
// permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this list of
// conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice, this list
// of conditions and the following disclaimer in the documentation and/or other
// materials provided with the distribution.
//
// 3. Neither the name of the copyright holder nor the names of its contributors may be
// used to endorse or promote products derived from this software without specific
// prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#pragma once
#include "serialization/wire/fwd.h"
#include "serialization/wire/read.h"
#include "serialization/wire/write.h"
//! Define functions that list fields in `type` (using virtual interface)
#define WIRE_DEFINE_OBJECT(type, map) \
void read_bytes(::wire::reader& source, type& dest) \
{ map(source, dest); } \
\
void write_bytes(::wire::writer& dest, const type& source) \
{ map(dest, source); }
//! Define `from_bytes` and `to_bytes` for `this`.
#define WIRE_DEFINE_CONVERSIONS() \
template<typename R, typename T> \
std::error_code from_bytes(T&& source) \
{ return ::wire_read::from_bytes<R>(std::forward<T>(source), *this); } \
\
template<typename W, typename T> \
std::error_code to_bytes(T& dest) const \
{ return ::wire_write::to_bytes<W>(dest, *this); }

41
contrib/epee/include/serialization/wire/adapted/list.h
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// Copyright (c) 2023, The Monero Project
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without modification, are
// permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this list of
// conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice, this list
// of conditions and the following disclaimer in the documentation and/or other
// materials provided with the distribution.
//
// 3. Neither the name of the copyright holder nor the names of its contributors may be
// used to endorse or promote products derived from this software without specific
// prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#pragma once
#include <list>
#include <type_traits>
#include "serialization/wire/traits.h"
namespace wire
{
template<typename T, typename A>
struct is_array<std::list<T, A>>
: std::true_type
{};
}

61
contrib/epee/include/serialization/wire/adapted/vector.h
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// Copyright (c) 2022-2023-2023, The Monero Project
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without modification, are
// permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this list of
// conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice, this list
// of conditions and the following disclaimer in the documentation and/or other
// materials provided with the distribution.
//
// 3. Neither the name of the copyright holder nor the names of its contributors may be
// used to endorse or promote products derived from this software without specific
// prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#pragma once
#include <cstdint>
#include <cstring>
#include <type_traits>
#include <vector>
#include "byte_slice.h"
#include "serialization/wire/traits.h"
namespace wire
{
template<typename T, typename A>
struct is_array<std::vector<T, A>>
: std::true_type
{};
template<typename A>
struct is_array<std::vector<std::uint8_t, A>>
: std::false_type
{};
template<typename R, typename A>
inline void read_bytes(R& source, std::vector<std::uint8_t, A>& dest)
{
const epee::byte_slice bytes = source.binary();
dest.resize(bytes.size());
std::memcpy(dest.data(), bytes.data(), bytes.size());
}
template<typename W, typename A>
inline void write_bytes(W& dest, const std::vector<std::uint8_t, A>& source)
{
dest.binary(epee::to_span(source));
}
}

137
contrib/epee/include/serialization/wire/error.h
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// Copyright (c) 2022-2023, The Monero Project
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without modification, are
// permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this list of
// conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice, this list
// of conditions and the following disclaimer in the documentation and/or other
// materials provided with the distribution.
//
// 3. Neither the name of the copyright holder nor the names of its contributors may be
// used to endorse or promote products derived from this software without specific
// prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#pragma once
#include <exception>
#include <system_error>
#include <type_traits>
#include "misc_log_ex.h"
//! Print default `code` message followed by optional message to debug log then throw `code`.
#define WIRE_DLOG_THROW_(code, ...) \
do \
{ \
MDEBUG( get_string(code) __VA_ARGS__ ); \
throw ::wire::exception_t<decltype(code)>{code}; \
} \
while (0)
//! Print default `code` message followed by `msg` to debug log then throw `code`.
#define WIRE_DLOG_THROW(code, msg) \
WIRE_DLOG_THROW_(code, << ": " << msg)
namespace wire
{
namespace error
{
enum class schema : int
{
none = 0, //!< Must be zero for `expect<..>`
array, //!< Expected an array value
array_max_element,//!< Exceeded max array count
array_min_size, //!< Below min element wire size
binary, //!< Expected a binary value of variable length
boolean, //!< Expected a boolean value
enumeration, //!< Expected a value from a specific set
fixed_binary, //!< Expected a binary value of fixed length
integer, //!< Expected an integer value
invalid_key, //!< Key for object is invalid
larger_integer, //!< Expected a larger integer value
maximum_depth, //!< Hit maximum number of object+array tracking
missing_key, //!< Missing required key for object
number, //!< Expected a number (integer or float) value
object, //!< Expected object value
smaller_integer, //!< Expected a smaller integer value
string, //!< Expected string value
};
//! \return Error message string.
const char* get_string(schema value) noexcept;
//! \return Category for `schema_error`.
const std::error_category& schema_category() noexcept;
//! \return Error code with `value` and `schema_category()`.
inline std::error_code make_error_code(const schema value) noexcept
{
return std::error_code{int(value), schema_category()};
}
} // error
//! `std::exception` doesn't require dynamic memory like `std::runtime_error`
struct exception : std::exception
{
exception() noexcept
: std::exception()
{}
exception(const exception&) = default;
exception& operator=(const exception&) = default;
virtual ~exception() noexcept
{}
virtual std::error_code code() const noexcept = 0;
};
template<typename T>
class exception_t final : public wire::exception
{
static_assert(std::is_enum<T>(), "only enumerated types allowed");
T value;
public:
exception_t(T value) noexcept
: value(value)
{}
exception_t(const exception_t&) = default;
~exception_t() = default;
exception_t& operator=(const exception_t&) = default;
const char* what() const noexcept override final
{
static_assert(noexcept(noexcept(get_string(value))), "get_string function must be noexcept");
return get_string(value);
}
std::error_code code() const noexcept override final
{
static_assert(noexcept(noexcept(make_error_code(value))), "make_error_code funcion must be noexcept");
return make_error_code(value);
}
};
} // wire
namespace std
{
template<>
struct is_error_code_enum<wire::error::schema>
: true_type
{};
}

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contrib/epee/include/serialization/wire/field.h
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// Copyright (c) 2021-2023, The Monero Project
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without modification, are
// permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this list of
// conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice, this list
// of conditions and the following disclaimer in the documentation and/or other
// materials provided with the distribution.
//
// 3. Neither the name of the copyright holder nor the names of its contributors may be
// used to endorse or promote products derived from this software without specific
// prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#pragma once
#include <functional>
#include <utility>
#include "serialization/wire/traits.h"
//! A required field has the same key name and C/C++ name
#define WIRE_FIELD(name) \
::wire::field( #name , std::ref( self . name ))
//! A required field has the same key name and C/C++ name AND is cheap to copy (faster output).
#define WIRE_FIELD_COPY(name) \
::wire::field( #name , self . name )
//! The optional field has the same key name and C/C++ name
#define WIRE_OPTIONAL_FIELD(name) \
::wire::optional_field( #name , std::ref( self . name ))
namespace wire
{
/*! Links `name` to a `value` for object serialization.
`value_type` is `T` with optional `std::reference_wrapper` removed.
`value_type` needs a `read_bytes` function when parsing with a
`wire::reader` - see `read.h` for more info. `value_type` needs a
`write_bytes` function when writing with a `wire::writer` - see `write.h`
for more info.
Any `value_type` where `is_optional_on_empty<value_type> == true`, will
automatically be converted to an optional field iff `value_type` has an
`empty()` method that returns `true`. The old output engine omitted fields
when an array was empty, and the standard input macro would ignore the
`false` return for the missing field. For compability reasons, the
input/output engine here matches that behavior. See `wrapper/array.h` to
enforce a required field even when the array is empty or specialize the
`is_optional_on_empty` trait. Only new fields should use this behavior.
Additional concept requirements for `value_type` when `Required == false`:
* must have an `operator*()` function.
* must have a conversion to bool function that returns true when
`operator*()` is safe to call (and implicitly when the associated field
should be written as opposed to skipped/omitted).
Additional concept requirements for `value_type` when `Required == false`
when reading:
* must have an `emplace()` method that ensures `operator*()` is safe to call.
* must have a `reset()` method to indicate a field was skipped/omitted.
If a standard type needs custom serialization, one "trick":
```
struct custom_tag{};
void read_bytes(wire::reader&, boost::fusion::pair<custom_tag, std::string&>)
{ ... }
void write_bytes(wire::writer&, boost::fusion::pair<custom_tag, const std::string&>)
{ ... }
template<typename F, typename T>
void object_map(F& format, T& self)
{
wire::object(format,
wire::field("foo", boost::fusion::make_pair<custom_tag>(std::ref(self.foo)))
);
}
```
Basically each input/output format needs a unique type so that the compiler
knows how to "dispatch" the read/write calls. */
template<typename T, bool Required>
struct field_
{
using value_type = unwrap_reference_t<T>;
//! \return True if field is forced optional when `get_value().empty()`.
static constexpr bool optional_on_empty() noexcept
{ return is_optional_on_empty<value_type>::value; }
static constexpr bool is_required() noexcept { return Required && !optional_on_empty(); }
static constexpr std::size_t count() noexcept { return 1; }
const char* name;
T value;
constexpr const value_type& get_value() const noexcept { return value; }
value_type& get_value() noexcept { return value; }
};
//! Links `name` to `value`. Use `std::ref` if de-serializing.
template<typename T>
constexpr inline field_<T, true> field(const char* name, T value)
{
return {name, std::move(value)};
}
//! Links `name` to optional `value`. Use `std::ref` if de-serializing.
template<typename T>
constexpr inline field_<T, false> optional_field(const char* name, T value)
{
return {name, std::move(value)};
}
template<typename T>
inline constexpr bool available(const field_<T, true>& elem)
{
/* The old output engine always skipped fields when it was an empty array,
this follows that behavior. See comments for `field_`. */
return elem.is_required() || (elem.optional_on_empty() && !wire::empty(elem.get_value()));
}
template<typename T>
inline constexpr bool available(const field_<T, false>& elem)
{
return bool(elem.get_value());
}
} // wire

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contrib/epee/include/serialization/wire/fwd.h
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// Copyright (c) 2021-2023, The Monero Project
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without modification, are
// permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this list of
// conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice, this list
// of conditions and the following disclaimer in the documentation and/or other
// materials provided with the distribution.
//
// 3. Neither the name of the copyright holder nor the names of its contributors may be
// used to endorse or promote products derived from this software without specific
// prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#pragma once
#include <type_traits>
//! Declare an enum to be serialized as an integer
#define WIRE_AS_INTEGER(type_) \
static_assert(std::is_enum<type_>(), "AS_INTEGER only enum types"); \
template<typename R> \
inline void read_bytes(R& source, type_& dest) \
{ \
std::underlying_type<type_>::type temp{}; \
read_bytes(source, temp); \
dest = type_(temp); \
} \
template<typename W> \
inline void write_bytes(W& dest, const type_ source) \
{ write_bytes(dest, std::underlying_type<type_>::type(source)); }
//! Declare functions that list fields in `type` (using virtual interface)
#define WIRE_DECLARE_OBJECT(type) \
void read_bytes(::wire::reader&, type&); \
void write_bytes(::wire::writer&, const type&)
//! Cast readers to `rtype` and writers to `wtype` before code expansion
#define WIRE_BEGIN_MAP_BASE(rtype, wtype) \
template<typename R> \
void read_bytes(R& source) \
{ wire_map(std::true_type{}, static_cast<rtype&>(source), *this); } \
\
template<typename W> \
void write_bytes(W& dest) const \
{ wire_map(std::false_type{}, static_cast<wtype&>(dest), *this); } \
\
template<typename B, typename F, typename T> \
static void wire_map(const B is_read, F& format, T& self) \
{ ::wire::object_fwd(is_read, format
/*! Define `read_bytes`, and `write_bytes` for `this` that forward the
derived format types for max performance. */
#define WIRE_BEGIN_MAP() \
WIRE_BEGIN_MAP_BASE(R, W)
/*! Define `read_bytes`, and `write_bytes` for `this` that forward base format
types to reduce code expansion and executable size. */
#define WIRE_BEGIN_MAP_ASM_SIZE() \
WIRE_BEGIN_MAP_BASE(::wire::reader, ::wire::writer)
//! End object map; omit last `,`
#define WIRE_END_MAP() );}
namespace wire
{
struct basic_value;
class reader;
struct writer;
// defined in `wire/read.h`
template<typename R, typename... T>
void object_fwd(std::true_type is_read, R& source, T&&... fields);
// defined in `wire/write.h`
template<typename W, typename... T>
void object_fwd(std::false_type is_read, W& dest, T... fields);
}
namespace wire_read
{
// defined in `wire/read.h`
template<typename R, typename T>
void bytes(R& source, T&& dest);
}
namespace wire_write
{
// defined in `wire/write.h`
template<typename W, typename T>
void bytes(W& dest, const T& source);
}

195
contrib/epee/include/serialization/wire/traits.h
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// Copyright (c) 2021, The Monero Project
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without modification, are
// permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this list of
// conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice, this list
// of conditions and the following disclaimer in the documentation and/or other
// materials provided with the distribution.
//
// 3. Neither the name of the copyright holder nor the names of its contributors may be
// used to endorse or promote products derived from this software without specific
// prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#pragma once
#include <cstdint>
#include <type_traits>
#define WIRE_DECLARE_BLOB_NS(type) \
template<> \
struct is_blob<type> \
: std::true_type \
{}
#define WIRE_DECLARE_BLOB(type) \
namespace wire { WIRE_DECLARE_BLOB_NS(type); }
#define WIRE_DECLARE_OPTIONAL_ROOT(type) \
template<> \
struct is_optional_root<type> \
: std::true_type \
{}
namespace wire
{
template<typename T>
struct unwrap_reference
{
using type = std::remove_cv_t<std::remove_reference_t<T>>;
};
template<typename T>
struct unwrap_reference<std::reference_wrapper<T>>
: std::remove_cv<T>
{};
template<typename T>
using unwrap_reference_t = typename unwrap_reference<T>::type;
/*! Mark `T` as an array for writing, and reading when
`default_min_element_size<T::value_type>::value != 0`. See `array_` in
`wrapper/array.h`. */
template<typename T>
struct is_array : std::false_type
{};
/*! Mark `T` as fixed binary data for reading+writing. Concept requirements
for reading:
* `T` must be compatible with `epee::as_mut_byte_span` (`std::is_pod<T>`
and no padding).
Concept requirements for writing:
* `T` must be compatible with `epee::as_byte_span` (std::is_pod<T>` and
no padding). */
template<typename T>
struct is_blob : std::false_type
{};
/*! Forces field to be optional when empty. Concept requirements for `T` when
`is_optional_on_empty<T>::value == true`:
* must have an `empty()` method that toggles whether the associated
`wire::field_<...>` is omitted by the `wire::writer`.
* must have a `clear()` method where `empty() == true` upon completion,
used by the `wire::reader` when the `wire::field_<...>` is omitted. */
template<typename T>
struct is_optional_on_empty
: is_array<T> // all array types in old output engine were optional when empty
{};
//! When `T` is being read as root object, allow an empty read buffer.
template<typename T>
struct is_optional_root
: std::is_empty<T>
{};
//! A constraint for `wire_read::array` where a max of `N` elements can be read.
template<std::size_t N>
struct max_element_count
: std::integral_constant<std::size_t, N>
{
// The threshold is low - min_element_size is a better constraint metric
static constexpr std::size_t max_bytes() noexcept { return 512 * 1024; } // 512 KiB
//! \return True if `N` C++ objects of type `T` are below `max_bytes()` threshold.
template<typename T>
static constexpr bool check() noexcept
{
return N <= (max_bytes() / sizeof(T));
}
};
//! A constraint for `wire_read::array` where each element must use at least `N` bytes on the wire.
template<std::size_t N>
struct min_element_size
: std::integral_constant<std::size_t, N>
{
static constexpr std::size_t max_ratio() noexcept { return 4; }
//! \return True if C++ object of type `T` with minimum wire size `N` is below `max_ratio()`.
template<typename T>
static constexpr bool check() noexcept
{
return N != 0 ? ((sizeof(T) / N) <= max_ratio()) : false;
}
};
/*! Trait used in `wire/read.h` for default `min_element_size` behavior based
on an array of `T` objects and `R` reader type. This trait can be used
instead of the `wire::array(...)` (and associated macros) functionality, as
it sets a global value. The last argument is for `enable_if`. */
template<typename R, typename T, typename = void>
struct default_min_element_size
: std::integral_constant<std::size_t, 0>
{};
//! If `T` is a blob, a safe default for all formats is the size of the blob
template<typename R, typename T>
struct default_min_element_size<R, T, std::enable_if_t<is_blob<T>::value>>
: std::integral_constant<std::size_t, sizeof(T)>
{};
// example usage : `wire::sum(std::size_t(wire::available(fields))...)`
inline constexpr int sum() noexcept
{
return 0;
}
template<typename T, typename... U>
inline constexpr T sum(const T head, const U... tail) noexcept
{
return head + sum(tail...);
}
template<typename... T>
using min_element_sizeof = min_element_size<sum(sizeof(T)...)>;
//! If container has no `reserve(0)` function, this function is used
template<typename... T>
inline void reserve(const T&...) noexcept
{}
//! Container has `reserve(std::size_t)` function, use it
template<typename T>
inline auto reserve(T& container, const std::size_t count) -> decltype(container.reserve(count))
{ return container.reserve(count); }
//! If `T` has no `empty()` function, this function is used
template<typename... T>
inline constexpr bool empty(const T&...) noexcept
{
static_assert(sum(is_optional_on_empty<T>::value...) == 0, "type needs empty method");
return false;
}
//! `T` has `empty()` function, use it
template<typename T>
inline auto empty(const T& container) -> decltype(container.empty())
{ return container.empty(); }
//! If `T` has no `clear()` function, this function is used
template<typename... T>
inline void clear(const T&...) noexcept
{
static_assert(sum(is_optional_on_empty<T>::value...) == 0, "type needs clear method");
}
//! `T` has `clear()` function, use it
template<typename T>
inline auto clear(T& container) -> decltype(container.clear())
{ return container.clear(); }
} // wire

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contrib/epee/include/serialization/wire/wrapper/defaulted.h
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// Copyright (c) 2021-2023, The Monero Project
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without modification, are
// permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this list of
// conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice, this list
// of conditions and the following disclaimer in the documentation and/or other
// materials provided with the distribution.
//
// 3. Neither the name of the copyright holder nor the names of its contributors may be
// used to endorse or promote products derived from this software without specific
// prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#pragma once
#include <functional>
#include <utility>
#include "serialization/wire/field.h"
#include "serialization/wire/traits.h"
//! An optional field that is omitted when a default value is used
#define WIRE_FIELD_DEFAULTED(name, default_) \
::wire::optional_field( #name , ::wire::defaulted(std::ref( self . name ), default_ ))
namespace wire
{
/*! A wrapper that tells `wire::writer`s to skip field generation when default
value, and tells `wire::reader`s to use default value when field not present. */
template<typename T, typename U>
struct defaulted_
{
using value_type = unwrap_reference_t<T>;
T value;
U default_;
constexpr const value_type& get_value() const noexcept { return value; }
value_type& get_value() noexcept { return value; }
// concept requirements for optional fields
constexpr explicit operator bool() const { return get_value() != default_; }
value_type& emplace() noexcept { return get_value(); }
constexpr const value_type& operator*() const noexcept { return get_value(); }
value_type& operator*() noexcept { return get_value(); }
void reset() { get_value() = default_; }
};
//! Links `value` with `default_`.
template<typename T, typename U>
inline constexpr defaulted_<T, U> defaulted(T value, U default_)
{
return {std::move(value), std::move(default_)};
}
/* read/write functions not needed since `defaulted_` meets the concept
requirements for an optional type (optional fields are handled
directly by the generic read/write code because the field name is omitted
entirely when the value is "empty"). */
} // wire

287
contrib/epee/include/serialization/wire/write.h
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// Copyright (c) 2023, The Monero Project
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without modification, are
// permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this list of
// conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice, this list
// of conditions and the following disclaimer in the documentation and/or other
// materials provided with the distribution.
//
// 3. Neither the name of the copyright holder nor the names of its contributors may be
// used to endorse or promote products derived from this software without specific
// prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#pragma once
#include <boost/utility/string_ref.hpp>
#include <boost/range/size.hpp>
#include <cstdint>
#include <system_error>
#include <type_traits>
#include "byte_slice.h"
#include "serialization/wire/error.h"
#include "serialization/wire/field.h"
#include "serialization/wire/traits.h"
#include "span.h"
/*
Custom types (e.g type `type` in namespace `ns`) can define an output function by:
* `namespace wire { template<> struct is_array<ns::type> : std::true_type {}; }`
* `namespace wire { template<> struct is_blob<ns::type> : std::true_type {}; }`
* `namespace wire { void write_bytes(writer&, const ns::type&); }`
* `namespace ns { void write_bytes(wire::writer&, const type&); }`
See `wrappers.h` for `is_array` requirements, and `traits.h` for `is_blob`
requirements. `write_bytes` function can also specify derived type for faster
output (i.e. `namespace ns { void write_bytes(wire::epee_writer&, type&); }`).
Using the derived type allows the compiler to de-virtualize and allows for
custom functions not defined by base interface. Using base interface allows
for multiple formats with minimal instruction count. */
namespace wire
{
//! Interface for converting C/C++ objects to "wire" (byte) formats.
struct writer
{
writer() = default;
virtual ~writer() noexcept;
//! By default, insist on retrieving array size before writing array
static constexpr std::true_type need_array_size() noexcept { return{}; }
virtual void boolean(bool) = 0;
virtual void integer(std::intmax_t) = 0;
virtual void unsigned_integer(std::uintmax_t) = 0;
virtual void real(double) = 0;
virtual void string(boost::string_ref) = 0;
virtual void binary(epee::span<const std::uint8_t>) = 0;
virtual void start_array(std::size_t) = 0;
virtual void end_array() = 0;
virtual void start_object(std::size_t) = 0;
virtual void key(boost::string_ref) = 0;
virtual void binary_key(epee::span<const std::uint8_t>) = 0;
virtual void end_object() = 0;
protected:
writer(const writer&) = default;
writer(writer&&) = default;
writer& operator=(const writer&) = default;
writer& operator=(writer&&) = default;
};
template<typename W>
inline void write_arithmetic(W& dest, const bool source)
{ dest.boolean(source); }
template<typename W>
inline void write_arithmetic(W& dest, const int source)
{ dest.integer(source); }
template<typename W>
inline void write_arithmetic(W& dest, const long source)
{ dest.integer(std::intmax_t(source)); }
template<typename W>
inline void write_arithmetic(W& dest, const long long source)
{ dest.integer(std::intmax_t(source)); }
template<typename W>
inline void write_arithmetic(W& dest, const unsigned source)
{ dest.unsigned_integer(source); }
template<typename W>
inline void write_arithmetic(W& dest, const unsigned long source)
{ dest.unsigned_integer(std::uintmax_t(source)); }
template<typename W>
inline void write_arithmetic(W& dest, const unsigned long long source)
{ dest.unsigned_integer(std::uintmax_t(source));}
template<typename W>
inline void write_arithmetic(W& dest, const double source)
{ dest.real(source); }
// Template both arguments to allow derived writer specializations
template<typename W, typename T>
inline std::enable_if_t<std::is_arithmetic<T>::value> write_bytes(W& dest, const T source)
{ write_arithmetic(dest, source); }
template<typename W>
inline void write_bytes(W& dest, const boost::string_ref source)
{ dest.string(source); }
template<typename W, typename T>
inline std::enable_if_t<is_blob<T>::value> write_bytes(W& dest, const T& source)
{ dest.binary(epee::as_byte_span(source)); }
template<typename W>
inline void write_bytes(W& dest, const epee::span<const std::uint8_t> source)
{ dest.binary(source); }
template<typename W>
inline void write_bytes(W& dest, const epee::byte_slice& source)
{ write_bytes(dest, epee::to_span(source)); }
//! Use `write_bytes(...)` method if available for `T`.
template<typename W, typename T>
inline auto write_bytes(W& dest, const T& source) -> decltype(source.write_bytes(dest))
{ return source.write_bytes(dest); }
}
namespace wire_write
{
/*! Don't add a function called `write_bytes` to this namespace, it will
prevent ADL lookup. ADL lookup delays the function searching until the
template is used instead of when its defined. This allows the unqualified
calls to `write_bytes` in this namespace to "find" user functions that are
declared after these functions. */
template<typename W, typename T>
inline void bytes(W& dest, const T& source)
{
write_bytes(dest, source); // ADL (searches every associated namespace)
}
//! Use writer `W` to convert `source` into bytes appended to `dest`.
template<typename W, typename T, typename U>
inline std::error_code to_bytes(T& dest, const U& source)
{
try
{
W out{std::move(dest)};
bytes(out, source);
dest = out.take_buffer();
}
catch (const wire::exception& e)
{
dest.clear();
return e.code();
}
catch (...)
{
dest.clear();
throw;
}
return {};
}
template<typename T>
inline std::size_t array_size(std::true_type, const T& source)
{ return boost::size(source); }
template<typename T>
inline constexpr std::size_t array_size(std::false_type, const T&) noexcept
{ return 0; }
template<typename W, typename T>
inline void array(W& dest, const T& source)
{
using value_type = typename T::value_type;
static_assert(!std::is_same<value_type, char>::value, "write array of chars as string");
static_assert(!std::is_same<value_type, std::int8_t>::value, "write array of signed chars as binary");
static_assert(!std::is_same<value_type, std::uint8_t>::value, "write array of unsigned chars as binary");
dest.start_array(array_size(dest.need_array_size(), source));
for (const auto& elem : source)
bytes(dest, elem);
dest.end_array();
}
template<typename W, typename T>
inline bool field(W& dest, const wire::field_<T, true>& field)
{
// Arrays always optional, see `wire/field.h`
if (wire::available(field))
{
dest.key(field.name);
bytes(dest, field.get_value());
}
return true;
}
template<typename W, typename T>
inline bool field(W& dest, const wire::field_<T, false>& field)
{
if (wire::available(field))
{
dest.key(field.name);
bytes(dest, *field.get_value());
}
return true;
}
template<typename W, typename T>
inline std::enable_if_t<std::is_pod<T>::value> dynamic_object_key(W& dest, const T& source)
{
dest.binary_key(epee::as_byte_span(source));
}
template<typename W>
inline void dynamic_object_key(W& dest, const boost::string_ref source)
{
dest.key(source);
}
template<typename W, typename T>
inline void dynamic_object(W& dest, const T& source)
{
dest.start_object(source.size());
for (const auto& elem : source)
{
dynamic_object_key(dest, elem.first);
bytes(dest, elem.second);
}
dest.end_object();
}
template<typename W, typename... T>
inline void object(W& dest, T&&... fields)
{
dest.start_object(wire::sum(std::size_t(wire::available(fields))...));
const bool dummy[] = {field(dest, std::forward<T>(fields))...};
dest.end_object();
(void)dummy; // expand into array to get 0,1,2,etc order
}
} // wire_write
namespace wire
{
template<typename W, typename T>
inline std::enable_if_t<is_array<T>::value> write_bytes(W& dest, const T& source)
{
wire_write::array(dest, source);
}
template<typename W, typename... T>
inline std::enable_if_t<std::is_base_of<writer, W>::value> object(W& dest, T... fields)
{
wire_write::object(dest, std::move(fields)...);
}
template<typename W, typename... T>
inline void object_fwd(const std::false_type /* is_read */, W& dest, T... fields)
{
wire::object(dest, std::move(fields)...);
}
}
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