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94 lines
2.9 KiB
C
94 lines
2.9 KiB
C
/* SPDX-License-Identifier: GPL-3.0-or-later
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* Copyright © 2016-2018 The TokTok team.
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* Copyright © 2013 Tox project.
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*/
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/**
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* Logger abstraction backed by callbacks for writing.
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*/
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#ifndef C_TOXCORE_TOXCORE_LOGGER_H
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#define C_TOXCORE_TOXCORE_LOGGER_H
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#include <stdint.h>
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#include "ccompat.h"
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#ifndef MIN_LOGGER_LEVEL
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#define MIN_LOGGER_LEVEL LOGGER_LEVEL_INFO
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#endif
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// NOTE: Don't forget to update build system files after modifying the enum.
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typedef enum Logger_Level {
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LOGGER_LEVEL_TRACE,
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LOGGER_LEVEL_DEBUG,
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LOGGER_LEVEL_INFO,
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LOGGER_LEVEL_WARNING,
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LOGGER_LEVEL_ERROR,
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} Logger_Level;
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typedef struct Logger Logger;
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typedef void logger_cb(void *context, Logger_Level level, const char *file, int line,
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const char *func, const char *message, void *userdata);
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/**
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* Creates a new logger with logging disabled (callback is NULL) by default.
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*/
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Logger *logger_new(void);
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/**
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* Frees all resources associated with the logger.
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*/
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void logger_kill(Logger *log);
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/**
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* Sets the logger callback. Disables logging if set to NULL.
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* The context parameter is passed to the callback as first argument.
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*/
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void logger_callback_log(Logger *log, logger_cb *function, void *context, void *userdata);
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/**
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* Main write function. If logging is disabled, this does nothing.
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*
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* If the logger is NULL, this writes to stderr. This behaviour should not be
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* used in production code, but can be useful for temporarily debugging a
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* function that does not have a logger available. It's essentially
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* fprintf(stderr, ...), but with timestamps and source location. Toxcore must
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* be built with -DUSE_STDERR_LOGGER for this to work. It will cause an
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* assertion failure otherwise.
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*/
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void logger_write(
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const Logger *log, Logger_Level level, const char *file, int line, const char *func,
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const char *format, ...) GNU_PRINTF(6, 7);
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#define LOGGER_WRITE(log, level, ...) \
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do { \
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if (level >= MIN_LOGGER_LEVEL) { \
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logger_write(log, level, __FILE__, __LINE__, __func__, __VA_ARGS__); \
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} \
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} while (0)
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/* To log with an logger */
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#define LOGGER_TRACE(log, ...) LOGGER_WRITE(log, LOGGER_LEVEL_TRACE , __VA_ARGS__)
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#define LOGGER_DEBUG(log, ...) LOGGER_WRITE(log, LOGGER_LEVEL_DEBUG , __VA_ARGS__)
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#define LOGGER_INFO(log, ...) LOGGER_WRITE(log, LOGGER_LEVEL_INFO , __VA_ARGS__)
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#define LOGGER_WARNING(log, ...) LOGGER_WRITE(log, LOGGER_LEVEL_WARNING, __VA_ARGS__)
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#define LOGGER_ERROR(log, ...) LOGGER_WRITE(log, LOGGER_LEVEL_ERROR , __VA_ARGS__)
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#define LOGGER_FATAL(log, ...) \
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do { \
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LOGGER_ERROR(log, __VA_ARGS__); \
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abort(); \
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} while(0)
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#define LOGGER_ASSERT(log, cond, ...) \
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do { \
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if (!(cond)) { \
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LOGGER_ERROR(log, "Assertion failed"); \
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LOGGER_FATAL(log, __VA_ARGS__); \
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} \
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} while(0)
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#endif // C_TOXCORE_TOXCORE_LOGGER_H
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