2a8ebc4906
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
95 lines
3.3 KiB
C++
95 lines
3.3 KiB
C++
#pragma once
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#include <mln/util/event.hpp>
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#include <mln/util/noncopyable.hpp>
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#include <memory>
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#include <string>
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#include <optional>
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namespace mln {
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class Log {
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public:
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class Observer : private util::noncopyable {
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public:
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virtual ~Observer() = default;
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/// When an observer is set, this function will be called for every log
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/// message. Returning true will consume the message.
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virtual bool onRecord(EventSeverity severity, Event event, int64_t code, const std::string& msg) = 0;
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};
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class NullObserver : public Observer {
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bool onRecord(EventSeverity, Event, int64_t, const std::string&) override { return true; }
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};
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static void setObserver(std::unique_ptr<Observer> Observer);
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static std::unique_ptr<Observer> removeObserver();
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private:
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template <typename T, size_t N>
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constexpr static bool includes(const T e, const T (&l)[N], const size_t i = 0) {
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return i < N && (l[i] == e || includes(e, l, i + 1));
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}
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public:
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Log();
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~Log();
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/// @brief Determines whether messages of a given severity level are logged asynchronously.
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///
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/// In a crash or other unexpected termination, pending asynchronous log entries will be lost.
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/// The default is true (asynchronous) for all levels except `Error`.
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static void useLogThread(bool enable, std::optional<EventSeverity> = {});
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template <typename... Args>
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static void Debug(Event event, Args&&... args) noexcept {
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Record(EventSeverity::Debug, event, ::std::forward<Args>(args)...);
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}
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template <typename... Args>
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static void Info(Event event, Args&&... args) noexcept {
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Record(EventSeverity::Info, event, ::std::forward<Args>(args)...);
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}
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template <typename... Args>
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static void Warning(Event event, Args&&... args) noexcept {
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Record(EventSeverity::Warning, event, ::std::forward<Args>(args)...);
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}
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template <typename... Args>
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static void Error(Event event, Args&&... args) noexcept {
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Record(EventSeverity::Error, event, ::std::forward<Args>(args)...);
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}
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template <typename... Args>
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static void Record(EventSeverity severity, Event event, Args&&... args) noexcept {
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if (!includes(severity, disabledEventSeverities) && !includes(event, disabledEvents) &&
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!includes({.severity = severity, .event = event}, disabledEventPermutations)) {
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record(severity, event, ::std::forward<Args>(args)...);
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}
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}
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private:
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static Log* get() noexcept;
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static void record(EventSeverity severity, Event event, const std::string& msg) noexcept;
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static void record(EventSeverity severity, Event event, int64_t code, const std::string& msg) noexcept;
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static void record(EventSeverity severity,
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Event event,
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int64_t code,
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const std::string& msg,
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const std::optional<std::string>& threadName);
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// This method is the data sink that must be implemented by each platform we
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// support. It should ideally output the error message in a human readable
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// format to the developer.
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static void platformRecord(EventSeverity severity, const std::string& msg);
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class Impl;
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const std::unique_ptr<Impl> impl;
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};
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} // namespace mln
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