utun2/lib/debug_config.h

/**
#include <stdio.h>
 * Runtime debug configuration system
 * Provides flexible control over debug output without recompilation
 */

#ifndef DEBUG_CONFIG_H
#define DEBUG_CONFIG_H

#include <stdint.h>
#include <stddef.h>
#include <time.h>

#ifdef __cplusplus
extern "C" {
#endif

/* Debug levels */
typedef enum {
    DEBUG_LEVEL_NONE = 0,     // No debug output
    DEBUG_LEVEL_ERROR = 1,    // Errors only
    DEBUG_LEVEL_WARN = 2,     // Warnings and errors
    DEBUG_LEVEL_INFO = 3,     // Info, warnings, errors
    DEBUG_LEVEL_DEBUG = 4,    // Full debug output
    DEBUG_LEVEL_TRACE = 5     // Trace everything
} debug_level_t;

/* Debug categories - can be combined with bitwise OR */
typedef enum {
    DEBUG_CATEGORY_NONE        = 0,
    DEBUG_CATEGORY_UASYNC      = 1 << 0,   // u_async module
    DEBUG_CATEGORY_LL_QUEUE    = 1 << 1,   // ll_queue module
    DEBUG_CATEGORY_CONNECTION  = 1 << 2,   // connection module
    DEBUG_CATEGORY_ETCP        = 1 << 3,   // etcp module
    DEBUG_CATEGORY_CRYPTO      = 1 << 4,   // crypto operations
    DEBUG_CATEGORY_MEMORY      = 1 << 5,   // memory management
    DEBUG_CATEGORY_TIMING      = 1 << 6,   // timing/performance
    DEBUG_CATEGORY_CONFIG      = 1 << 7,   // configuration parsing
    DEBUG_CATEGORY_TUN         = 1 << 8,   // TUN interface
    DEBUG_CATEGORY_ROUTING     = 1 << 9,   // routing table
    DEBUG_CATEGORY_ALL         = 0xFFFFFFFF
} debug_category_t;

/* Debug configuration structure */
typedef struct {
    debug_level_t level;           // Global debug level
    uint32_t categories;           // Enabled categories (bitmask)
    int timestamp_enabled;         // Include timestamps in output
    int function_name_enabled;     // Include function names
    int file_line_enabled;         // Include file:line info
    int color_enabled;             // Use ANSI colors (if terminal supports)
    size_t max_output_per_second;  // Rate limiting (0 = unlimited)
    const char* output_file;       // NULL = stderr, otherwise file path
} debug_config_t;

/* Global debug configuration */
extern debug_config_t g_debug_config;

/* Initialize debug system with default settings */
void debug_config_init(void);

/* Set debug level */
void debug_set_level(debug_level_t level);

/* Enable/disable specific categories */
void debug_enable_category(debug_category_t category);
void debug_disable_category(debug_category_t category);
void debug_set_categories(uint32_t categories);

/* Configure output options */
void debug_enable_timestamp(int enable);
void debug_enable_function_name(int enable);
void debug_enable_file_line(int enable);
void debug_enable_color(int enable);
void debug_set_rate_limit(size_t max_per_second);
void debug_set_output_file(const char* file_path);

/* Parse debug configuration from string (e.g., "uasync:debug,ll_queue:info") */
int debug_parse_config(const char* config_string);

/* Parse debug configuration from file */
int debug_parse_config_file(const char* file_path);

/* Enable/disable automatic config file reloading */
int debug_enable_config_reload(const char* file_path, int interval_seconds);

#include <stdio.h>
extern FILE* debug_output_file;

/* Check if debug output should be shown for given level and category */
int debug_should_output(debug_level_t level, debug_category_t category);

/* Get current debug level for a category */
debug_level_t debug_get_effective_level(debug_category_t category);

/* Format and output debug message (internal use by macros) */
void debug_output(debug_level_t level, debug_category_t category, 
                 const char* function, const char* file, int line,
                 const char* format, ...);

/* Parse debug configuration from file */
int debug_parse_config_file(const char* file_path);

/* Enable/disable automatic config file reloading */
int debug_enable_config_reload(const char* file_path, int interval_seconds);
/* Format and output debug message (internal use by macros) */
void debug_output(debug_level_t level, debug_category_t category, 
                 const char* function, const char* file, int line,
                 const char* format, ...);

/* Convenience macros for debug output */
#define DEBUG_ERROR(category, fmt, ...) \
    do { if (debug_should_output(DEBUG_LEVEL_ERROR, category)) { \
        debug_output(DEBUG_LEVEL_ERROR, category, __FUNCTION__, __FILE__, __LINE__, fmt, ##__VA_ARGS__); \
    } } while(0)

#define DEBUG_WARN(category, fmt, ...) \
    do { if (debug_should_output(DEBUG_LEVEL_WARN, category)) { \
        debug_output(DEBUG_LEVEL_WARN, category, __FUNCTION__, __FILE__, __LINE__, fmt, ##__VA_ARGS__); \
    } } while(0)

#define DEBUG_INFO(category, fmt, ...) \
    do { if (debug_should_output(DEBUG_LEVEL_INFO, category)) { \
        debug_output(DEBUG_LEVEL_INFO, category, __FUNCTION__, __FILE__, __LINE__, fmt, ##__VA_ARGS__); \
    } } while(0)

#define DEBUG_DEBUG(category, fmt, ...) \
    do { if (debug_should_output(DEBUG_LEVEL_DEBUG, category)) { \
        debug_output(DEBUG_LEVEL_DEBUG, category, __FUNCTION__, __FILE__, __LINE__, fmt, ##__VA_ARGS__); \
    } } while(0)

#define DEBUG_TRACE(category, fmt, ...) \
    do { if (debug_should_output(DEBUG_LEVEL_TRACE, category)) { \
        debug_output(DEBUG_LEVEL_TRACE, category, __FUNCTION__, __FILE__, __LINE__, fmt, ##__VA_ARGS__); \
    } } while(0)

/* Backward compatibility - default to ERROR level if not specified */
#define DEBUG_OUTPUT(fmt, ...) DEBUG_ERROR(DEBUG_CATEGORY_ALL, fmt, ##__VA_ARGS__)

#ifdef __cplusplus
}
#endif

#endif // DEBUG_CONFIG_H