#!/bin/bash

# 本脚本功能：  
#    1. 从logrotate配置文件中取出日志文件的路径（所有日志文件均以logrotate配置文件中第一行指示的路径为前缀），  
#    2. 从log_sched配置文件中取出日志文件大小上限
#    3. 计算步骤1指示的日志文件的总大小，检测日志总大小是否超出上限，若超出则删除所有日志文件  

function deal_logs ()
{

	# logrotate配置文件路径  
	logrotate_log_file="/etc/logrotate.d/log-syslog"

	#log_sched配置文件路径
	log_sched_file="/etc/log-sched.conf"
	
	# 日志文件前缀  
	prefix=
	
	# 日志大小上限  
	size_max=0

	echo "**********************************************************"
	echo "  logrotate_cfg: $logrotate_log_file"
	echo "  log_sched_cfg: $log_sched_file"
	echo "**********************************************************"
	echo ""

	# logrotate配置文件判空  
	if [ ! -e $logrotate_log_file ] ; then
		return 
	fi
	
	# 从logrotate配置文件中第一行有效行中读取出日志文件前缀  
	while read line
	do
		if [ -z $line ] ; then
			continue
		fi
	
		prefix=$line;
		echo "**********************************************************"
		echo "  get log-file-prefix: $prefix"
		echo "**********************************************************"
		echo ""
	
		break
	done  < $logrotate_log_file
	
	if [ -z $prefix ] ; then
		echo "get log file failed"
			return
	fi


	# log_sched配置文件判空  
	if [ ! -e $log_sched_file ] ; then
		return 
	fi

	#从log_sched配置文件中读取出日志大小上限值
	while read line
	do
		tmpkey="file.max_size="

		if [[ $line = *$tmpkey* ]] ; then
			if [[ $line = $tmpkey ]] ; then
				echo "size_max is empty, do nothing and return"
				return
			fi

			size_max=${line#$tmpkey}
			echo "**********************************************************"
			echo "  get size_max: $size_max"
			echo "**********************************************************"
			echo ""

	       		break
		fi
	done  < $log_sched_file
	

	if [ $size_max -eq 0 ] ; then
		echo "size_max is 0, do nothing and return"
		return
	fi

	#定期检查日志总大小是否超限  
	path=$prefix*
	echo "  get path: $path"
	
	folder_size=$(wc -c $path|grep total |awk '{print $1}')
	if [ -z $folder_size ] ; then
		folder_size=0
	fi
	
	if [ $folder_size -eq 0 ]; then
		folder_size=$(wc -c $path|awk '{print $1}')
	fi
	if [ -z $folder_size ] ; then
		folder_size=0
	fi

	echo "cursize: $folder_size"
	echo "maxsize: $size_max"
	
	if [ $folder_size -gt $size_max ] ; then
		 echo "flush folder $path"
		 rm -rf $path
		 sync
	fi
}

deal_logs $@