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/**************************************************************************//**
* @file
* Wrapper for event logging built on syslog.
*
* License
* -------
*
* Copyright © 2017 AT&T Intellectual Property. All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*****************************************************************************/
#include <string.h>
#include <assert.h>
#include <syslog.h>
#include <stdlib.h>
#include <sys/time.h>
#include <curl/curl.h>
#include "evel.h"
/*****************************************************************************/
/* Debug settings. Logging is done through macros so these need to be */
/* externally visible. */
/*****************************************************************************/
EVEL_LOG_LEVELS debug_level = EVEL_LOG_DEBUG;
//static char *syslog_ident = "evel";
int debug_indent = 0;
/*****************************************************************************/
/* Buffers for error strings from this library. */
/*****************************************************************************/
static char evel_err_string[EVEL_MAX_ERROR_STRING_LEN] = "<NULL>";
/**************************************************************************//**
* Initialize logging
*
* @param[in] level The debugging level - one of ::EVEL_LOG_LEVELS.
* @param[in] ident The identifier for our logs.
*****************************************************************************/
void log_initialize(EVEL_LOG_LEVELS level, const char * ident)
{
assert(level < EVEL_LOG_MAX);
assert(ident != NULL);
debug_level = level;
openlog(ident, LOG_PID, LOG_USER);
}
/**************************************************************************//**
* Descriptive text for library errors.
*
* Return a text error string that relates to the last failure. May be
* "<null>" but will never be NULL.
*
* @returns Text error string.
*
* @note Must not be freed!
*****************************************************************************/
const char * evel_error_string(void)
{
return(evel_err_string);
}
/***************************************************************************//*
* Store the formatted string into the static error string and log the error.
*
* @param format Error string in standard printf format.
* @param ... Variable parameters to be substituted into the format string.
*****************************************************************************/
void log_error_state(char * format, ...)
{
va_list largs;
assert(format != NULL);
va_start(largs, format);
vsnprintf(evel_err_string, EVEL_MAX_ERROR_STRING_LEN, format, largs);
va_end(largs);
EVEL_ERROR("%s", evel_err_string);
}
/**************************************************************************//**
* Generate a debug log.
*
* Provides an interface to syslog with formatting of the nesting level
* so that it's easier to see function entry/exit.
*
* @param[in] level The debug level - see ::EVEL_LOG_LEVELS.
* @param[in] format The output formatting in printf style.
* @param[in] ... Variable arguments as specified in the format string.
*****************************************************************************/
void log_debug(EVEL_LOG_LEVELS level, char * format, ...)
{
va_list largs;
int priority;
char indent_fmt[1024];
char *syslog_fmt = NULL;
/***************************************************************************/
/* Test assumptions. */
/***************************************************************************/
assert(format != NULL);
assert(level <= EVEL_LOG_MAX);
if (level >= debug_level)
{
if ((debug_level == EVEL_LOG_INFO) || (debug_indent == 0))
{
/***********************************************************************/
/* Just use the format as is. */
/***********************************************************************/
syslog_fmt = format;
}
else
{
/***********************************************************************/
/* Combine the format with a preceding number of indent markers. */
/***********************************************************************/
sprintf(indent_fmt, "%.*s%s",
debug_indent,
INDENT_SEPARATORS,
format);
syslog_fmt = indent_fmt;
}
/*************************************************************************/
/* Work out the syslog priority value. */
/*************************************************************************/
switch (level)
{
case EVEL_LOG_ERROR:
priority = LOG_ERR;
break;
case EVEL_LOG_INFO:
priority = LOG_INFO;
break;
case EVEL_LOG_DEBUG:
case EVEL_LOG_SPAMMY:
default:
priority = LOG_DEBUG;
break;
}
/*************************************************************************/
/* Write the log to the file next, which requires the var args list. */
/*************************************************************************/
va_start(largs, format);
vsyslog(priority, syslog_fmt, largs);
va_end(largs);
}
}
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