Error.cpp

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// The Reactive C++ Toolbox.
// Copyright (C) 2013-2019 Swirly Cloud Limited
// Copyright (C) 2021 Reactive Markets Limited
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
 
#include "Error.hpp"
 
namespace toolbox {
using namespace std::literals::string_literals;
inline namespace http {
namespace {
struct ErrorCategory final : std::error_category {
    constexpr ErrorCategory() noexcept = default;
    ~ErrorCategory() override = default;
 
    // Copy.
    ErrorCategory(const ErrorCategory&) = delete;
    ErrorCategory& operator=(const ErrorCategory&) = delete;
 
    // Move.
    ErrorCategory(ErrorCategory&&) = delete;
    ErrorCategory& operator=(ErrorCategory&&) = delete;
 
    const char* name() const noexcept override { return "http"; }
    std::string message(int err) const override { return enum_string(static_cast<Status>(err)); }
};
 
const ErrorCategory ecat_{};
} // namespace
 
const std::error_category& error_category() noexcept
{
    return ecat_;
}
 
std::error_code make_error_code(Status status)
{
    return {static_cast<int>(status), ecat_};
}
 
Status http_status(const std::error_code& ec)
{
    if (ec.category() != error_category()) {
        return Status::InternalServerError;
    }
    return static_cast<Status>(ec.value());
}
 
} // namespace http
} // namespace toolbox