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/*-
* Copyright 2022 Vsevolod Stakhov
*
* 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.
*/
#ifndef RSPAMD_ERROR_HXX
#define RSPAMD_ERROR_HXX
#pragma once
#include "config.h"
#include <string>
#include <string_view>
#include <cstdint>
#include <optional>
/***
* This unit is used to represent Rspamd C++ errors in a way to interoperate
* with C code if needed and avoid allocations for static strings
*/
namespace rspamd::util {
enum class error_category : std::uint8_t {
INFORMAL,
IMPORTANT,
CRITICAL
};
struct error {
public:
/**
* Construct from a static string, this string must live long enough to outlive this object
* @param msg
* @param code
* @param category
*/
error(const char *msg, int code, error_category category = error_category::INFORMAL) :
error_message(msg), error_code(code), category(category) {}
/**
* Construct error from a temporary string taking membership
* @param msg
* @param code
* @param category
*/
error(std::string &&msg, int code, error_category category = error_category::INFORMAL)
: error_code(code), category(category) {
static_storage = std::move(msg);
error_message = static_storage.value();
}
/**
* Construct error from another string copying it into own storage
* @param msg
* @param code
* @param category
*/
error(const std::string &msg, int code, error_category category = error_category::INFORMAL)
: error_code(code), category(category) {
static_storage = msg;
error_message = static_storage.value();
}
error(const error &other) : error_code(other.error_code), category(other.category) {
if (other.static_storage) {
static_storage = other.static_storage;
error_message = static_storage.value();
}
else {
error_message = other.error_message;
}
}
error(error &&other) noexcept {
*this = std::move(other);
}
error& operator = (error &&other) noexcept {
if (other.static_storage.has_value()) {
std::swap(static_storage, other.static_storage);
error_message = static_storage.value();
}
else {
std::swap(error_message, other.error_message);
}
std::swap(other.error_code, error_code);
std::swap(other.category, category);
return *this;
}
/**
* Convert into GError
* @return
*/
auto into_g_error() const -> GError * {
return g_error_new(g_quark_from_static_string("rspamd"), error_code, "%s",
error_message.data());
}
/**
* Convenience alias for the `into_g_error`
* @param err
*/
auto into_g_error_set(GError **err) const -> void {
if (err && *err == nullptr) {
*err = into_g_error();
}
}
public:
std::string_view error_message;
int error_code;
error_category category;
private:
std::optional<std::string> static_storage;
};
} // namespace rspamd::util
#endif //RSPAMD_ERROR_HXX
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