tdlight/tdutils/td/utils/logging.h
2021-05-27 00:50:41 +02:00

245 lines
6.9 KiB
C++

//
// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2021
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#pragma once
/*
* Simple logging.
*
* Predefined log levels: FATAL, ERROR, WARNING, INFO, DEBUG
*
* LOG(WARNING) << "Hello world!";
* LOG(INFO) << "Hello " << 1234 << " world!";
* LOG_IF(INFO, condition) << "Hello world if condition!";
*
* Custom log levels may be defined and used using VLOG:
* int VERBOSITY_NAME(custom) = VERBOSITY_NAME(WARNING);
* VLOG(custom) << "Hello custom world!"
*
* LOG(FATAL) << "Power is off";
* CHECK(condition) <===> LOG_IF(FATAL, !(condition))
*/
#include "td/utils/common.h"
#include "td/utils/port/thread_local.h"
#include "td/utils/Slice.h"
#include "td/utils/StackAllocator.h"
#include "td/utils/StringBuilder.h"
#include <atomic>
#include <type_traits>
#define VERBOSITY_NAME(x) verbosity_##x
#define GET_VERBOSITY_LEVEL() (::td::get_verbosity_level())
#define SET_VERBOSITY_LEVEL(new_level) (::td::set_verbosity_level(new_level))
#ifndef STRIP_LOG
#define STRIP_LOG VERBOSITY_NAME(DEBUG)
#endif
#define LOG_IS_STRIPPED(strip_level) \
(::std::integral_constant<int, VERBOSITY_NAME(strip_level)>() > ::std::integral_constant<int, STRIP_LOG>())
#define LOGGER(interface, options, level, comment) ::td::Logger(interface, options, level, __FILE__, __LINE__, comment)
#define LOG_IMPL_FULL(interface, options, strip_level, runtime_level, condition, comment) \
LOG_IS_STRIPPED(strip_level) || runtime_level > options.get_level() || !(condition) \
? (void)0 \
: ::td::detail::Voidify() & LOGGER(interface, options, runtime_level, comment)
#define LOG_IMPL(strip_level, level, condition, comment) \
LOG_IMPL_FULL(*::td::log_interface, ::td::log_options, strip_level, VERBOSITY_NAME(level), condition, comment)
#define LOG(level) LOG_IMPL(level, level, true, ::td::Slice())
#define LOG_IF(level, condition) LOG_IMPL(level, level, condition, #condition)
#define VLOG(level) LOG_IMPL(DEBUG, level, true, TD_DEFINE_STR(level))
#define VLOG_IF(level, condition) LOG_IMPL(DEBUG, level, condition, TD_DEFINE_STR(level) " " #condition)
#define LOG_TAG ::td::Logger::tag_
#define LOG_TAG2 ::td::Logger::tag2_
#if TD_CLANG
bool no_return_func() __attribute__((analyzer_noreturn));
#endif
inline bool no_return_func() {
return true;
}
// clang-format off
#define DUMMY_LOG_CHECK(condition) LOG_IF(NEVER, !(condition))
#ifdef TD_DEBUG
#if TD_MSVC
#define LOG_CHECK(condition) \
__analysis_assume(!!(condition)); \
LOG_IMPL(FATAL, FATAL, !(condition), #condition)
#else
#define LOG_CHECK(condition) LOG_IMPL(FATAL, FATAL, !(condition) && no_return_func(), #condition)
#endif
#else
#define LOG_CHECK DUMMY_LOG_CHECK
#endif
#if NDEBUG
#define LOG_DCHECK DUMMY_LOG_CHECK
#else
#define LOG_DCHECK LOG_CHECK
#endif
// clang-format on
constexpr int VERBOSITY_NAME(PLAIN) = -1;
constexpr int VERBOSITY_NAME(FATAL) = 0;
constexpr int VERBOSITY_NAME(ERROR) = 1;
constexpr int VERBOSITY_NAME(WARNING) = 2;
constexpr int VERBOSITY_NAME(INFO) = 3;
constexpr int VERBOSITY_NAME(DEBUG) = 4;
constexpr int VERBOSITY_NAME(NEVER) = 1024;
namespace td {
struct LogOptions {
std::atomic<int> level{VERBOSITY_NAME(DEBUG) + 1};
bool fix_newlines{true};
bool add_info{true};
int get_level() const {
return level.load(std::memory_order_relaxed);
}
int set_level(int new_level) {
return level.exchange(new_level);
}
static const LogOptions &plain() {
static LogOptions plain_options{0, false, false};
return plain_options;
}
constexpr LogOptions() = default;
constexpr LogOptions(int level, bool fix_newlines, bool add_info)
: level(level), fix_newlines(fix_newlines), add_info(add_info) {
}
LogOptions(const LogOptions &other) : LogOptions(other.level.load(), other.fix_newlines, other.add_info) {
}
LogOptions &operator=(const LogOptions &other) {
level = other.level.load();
fix_newlines = other.fix_newlines;
add_info = other.add_info;
return *this;
}
LogOptions(LogOptions &&) = delete;
LogOptions &operator=(LogOptions &&) = delete;
~LogOptions() = default;
};
extern LogOptions log_options;
inline int set_verbosity_level(int level) {
return log_options.set_level(level);
}
inline int get_verbosity_level() {
return log_options.get_level();
}
class LogInterface {
public:
LogInterface() = default;
LogInterface(const LogInterface &) = delete;
LogInterface &operator=(const LogInterface &) = delete;
LogInterface(LogInterface &&) = delete;
LogInterface &operator=(LogInterface &&) = delete;
virtual ~LogInterface() = default;
void append(int log_level, CSlice slice);
virtual void after_rotation() {
}
virtual vector<string> get_file_paths() {
return {};
}
virtual void do_append(int log_level, CSlice slice) = 0;
};
extern LogInterface *const default_log_interface;
extern LogInterface *log_interface;
using OnFatalErrorCallback = void (*)(CSlice message);
void set_log_fatal_error_callback(OnFatalErrorCallback callback);
void set_log_disable_death_handler(bool disabled);
[[noreturn]] void process_fatal_error(CSlice message);
using OnLogMessageCallback = void (*)(int verbosity_level, CSlice message);
void set_log_message_callback(int max_verbosity_level, OnLogMessageCallback callback);
class Logger {
static const size_t BUFFER_SIZE = 128 * 1024;
public:
Logger(LogInterface &log, const LogOptions &options, int log_level)
: buffer_(StackAllocator::alloc(BUFFER_SIZE))
, log_(log)
, sb_(buffer_.as_slice())
, options_(options)
, log_level_(log_level) {
}
Logger(LogInterface &log, const LogOptions &options, int log_level, Slice file_name, int line_num, Slice comment);
template <class T>
Logger &operator<<(T &&other) {
sb_ << other;
return *this;
}
MutableCSlice as_cslice() {
return sb_.as_cslice();
}
bool is_error() const {
return sb_.is_error();
}
Logger(const Logger &) = delete;
Logger &operator=(const Logger &) = delete;
Logger(Logger &&) = delete;
Logger &operator=(Logger &&) = delete;
~Logger();
static TD_THREAD_LOCAL const char *tag_;
static TD_THREAD_LOCAL const char *tag2_;
private:
decltype(StackAllocator::alloc(0)) buffer_;
LogInterface &log_;
StringBuilder sb_;
const LogOptions &options_;
int log_level_;
};
class ScopedDisableLog {
public:
ScopedDisableLog();
ScopedDisableLog(const ScopedDisableLog &) = delete;
ScopedDisableLog &operator=(const ScopedDisableLog &) = delete;
ScopedDisableLog(ScopedDisableLog &&) = delete;
ScopedDisableLog &operator=(ScopedDisableLog &&) = delete;
~ScopedDisableLog();
};
namespace detail {
class Voidify {
public:
template <class T>
void operator&(const T &) {
}
};
} // namespace detail
} // namespace td