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// Copyright 2022 Huawei Cloud Computing Technology Co., Ltd.
//
// 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 INCLUDED_SRC_BUILDTOOL_LOGGING_LOG_CONFIG_HPP
#define INCLUDED_SRC_BUILDTOOL_LOGGING_LOG_CONFIG_HPP
#include <mutex>
#include <utility> // std::move
#include <vector>
#include "src/buildtool/logging/log_level.hpp"
#include "src/buildtool/logging/log_sink.hpp"
/// \brief Global static logging configuration.
/// The entire class is thread-safe.
class LogConfig {
struct ConfigData {
std::mutex mutex{};
LogLevel log_limit{LogLevel::Info};
std::vector<ILogSink::Ptr> sinks{};
std::vector<LogSinkFactory> factories{};
};
public:
/// \brief Set the log limit.
static void SetLogLimit(LogLevel level) noexcept {
Data().log_limit = level;
}
/// \brief Replace all configured sinks.
/// NOTE: Reinitializes all internal factories.
static void SetSinks(std::vector<LogSinkFactory>&& factories) noexcept {
auto& data = Data();
std::lock_guard lock{data.mutex};
data.sinks.clear();
data.sinks.reserve(factories.size());
std::transform(factories.cbegin(),
factories.cend(),
std::back_inserter(data.sinks),
[](auto& f) { return f(); });
data.factories = std::move(factories);
}
/// \brief Add new a new sink.
static void AddSink(LogSinkFactory&& factory) noexcept {
auto& data = Data();
std::lock_guard lock{data.mutex};
data.sinks.push_back(factory());
data.factories.push_back(std::move(factory));
}
/// \brief Get the currently configured log limit.
[[nodiscard]] static auto LogLimit() noexcept -> LogLevel {
return Data().log_limit;
}
/// \brief Get sink instances for all configured sink factories.
/// Returns a const copy of shared_ptrs, so accessing the sinks in the
/// calling context is thread-safe.
// NOLINTNEXTLINE(readability-const-return-type)
[[nodiscard]] static auto Sinks() noexcept
-> std::vector<ILogSink::Ptr> const {
auto& data = Data();
std::lock_guard lock{data.mutex};
return data.sinks;
}
/// \brief Get all configured sink factories.
/// Returns a const copy of shared_ptrs, so accessing the factories in the
/// calling context is thread-safe.
// NOLINTNEXTLINE(readability-const-return-type)
[[nodiscard]] static auto SinkFactories() noexcept
-> std::vector<LogSinkFactory> const {
auto& data = Data();
std::lock_guard lock{data.mutex};
return data.factories;
}
private:
[[nodiscard]] static auto Data() noexcept -> ConfigData& {
static ConfigData instance{};
return instance;
}
};
#endif // INCLUDED_SRC_BUILDTOOL_LOGGING_LOG_CONFIG_HPP
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