c-libp2p/utils/logger.c

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#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <stdarg.h>
#include "libp2p/utils/logger.h"
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#include "libp2p/utils/vector.h"
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/**
* A class to handle logging
*/
struct Libp2pVector* logger_classes = NULL;
/**
* Initialize the logger. This should be done only once.
*/
void libp2p_logger_init() {
logger_classes = libp2p_utils_vector_new(1);
}
/***
* Checks to see if the logger has been initialized
*/
int libp2p_logger_initialized() {
if (logger_classes == NULL)
return 0;
return 1;
}
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int libp2p_logger_free() {
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if (logger_classes != NULL) {
for(int i = 0; i < logger_classes->total; i++) {
free((char*)libp2p_utils_vector_get(logger_classes, i));
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}
libp2p_utils_vector_free(logger_classes);
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}
return 1;
}
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/***
* Add a class to watch for logging messages
* @param str the class name to watch
*/
void libp2p_logger_add_class(const char* str) {
if (!libp2p_logger_initialized())
libp2p_logger_init();
char* ptr = malloc(strlen(str) + 1);
strcpy(ptr, str);
libp2p_utils_vector_add(logger_classes, ptr);
}
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/**
* Determines if this "class" is to be logged
* @param str the "class" to check
* @returns true(1) if found, false(0) otherwise
*/
int libp2p_logger_watching_class(const char* str) {
for(int i = 0; i < logger_classes->total; i++) {
if (strcmp(libp2p_utils_vector_get(logger_classes, i), str) == 0)
return 1;
}
return 0;
}
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/**
* Log a message to the console
* @param area the class it is coming from
* @param log_level logger level
* @param format the logging string
* @param ... params
*/
void libp2p_logger_log(const char* area, int log_level, const char* format, ...) {
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if (!libp2p_logger_initialized())
libp2p_logger_init();
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if (log_level <= CURRENT_LOGLEVEL) {
if (libp2p_logger_watching_class(area)) {
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va_list argptr;
va_start(argptr, format);
vfprintf(stderr, format, argptr);
va_end(argptr);
}
}
}
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/**
* Log a message to the console
* @param area the class it is coming from
* @param log_level logger level
* @param format the logging string
* @param ... params
*/
void libp2p_logger_vlog(const char* area, int log_level, const char* format, va_list argptr) {
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if (!libp2p_logger_initialized())
libp2p_logger_init();
// only allow a message if the message log level is less than the current loglevel
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if (log_level <= CURRENT_LOGLEVEL) {
int found = 0;
// error should always be printed for now. We need to think about this more...
if (log_level <= LOGLEVEL_ERROR )
found = 1;
else
found = libp2p_logger_watching_class(area);
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if (found) {
vfprintf(stderr, format, argptr);
}
}
}
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/**
* Log a debug message to the console
* @param area the class it is coming from
* @param format the logging string
* @param ... params
*/
void libp2p_logger_debug(const char* area, const char* format, ...) {
va_list argptr;
va_start(argptr, format);
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libp2p_logger_vlog(area, LOGLEVEL_DEBUG, format, argptr);
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va_end(argptr);
}
/**
* Log an error message to the console
* @param area the class it is coming from
* @param format the logging string
* @param ... params
*/
void libp2p_logger_error(const char* area, const char* format, ...) {
va_list argptr;
va_start(argptr, format);
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libp2p_logger_vlog(area, LOGLEVEL_ERROR, format, argptr);
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va_end(argptr);
}
/**
* Log an info message to the console
* @param area the class it is coming from
* @param format the logging string
* @param ... params
*/
void libp2p_logger_info(const char* area, const char* format, ...) {
va_list argptr;
va_start(argptr, format);
libp2p_logger_vlog(area, LOGLEVEL_INFO, format, argptr);
va_end(argptr);
}