#!/bin/bash
# full && increment backup and recover
# 說明：事先要創建/data/bak目錄，且在執行增量備份時做過至少一次全量備份，否則找不到position文件。
port='3306'
back_src_dir="/data/mysql/${port}/logs/binlog"
back_dir='/data/bak'
DATE=`date +%Y%m%d`
user='root'
pass='cy2009'
bak_db='test1'
mysql_bin='/usr/local/mysql-5.1.48/bin'
socket="/data/mysql/${port}/mysql.sock"

full_bak()
{
cd ${back_dir}
DumpFile=Full_back$DATE.sql
${mysql_bin}/mysqldump --lock-all-tables --flush-logs --master-data=2 -u${user} -p${pass} ${bak_db} > ${DumpFile}
${mysql_bin}/mysql -u${user} -p${pass} --socket=${socket} -e "unlock tables"

#把當前的binlog和position信息存入position文件
cat ${DumpFile} |grep 'MASTER_LOG_FILE'|awk -F"'" '{print $2}' > ${back_dir}/position
cat ${DumpFile} |grep 'MASTER_LOG_FILE'|awk -F"=" '{print $3}' |awk -F";" '{print $1}' >> ${back_dir}/position
}

incre_bak()
{
#鎖定表，刷新log
${mysql_bin}/mysql -u${user} -p${pass} --socket=${socket} -e "flush tables with read lock"
${mysql_bin}/mysqladmin -u${user} -p${pass} --socket=${socket} flush-logs
#獲取上次備份完成時的binlog和position
cd ${back_dir}
start_binlog=`sed -n '1p' position`
start_pos=`sed -n '2p' position`

#獲取目前的binlog和position
mysql -u${user} -p${pass} --socket=${socket} -e "show master status\G" | awk '{print $2}'| sed -n '2,3p' > now_position
stop_binlog=`sed -n '1p' now_position`
stop_pos=`sed -n '2p' now_position`

#如果在同一個binlog中
if [ "${start_binlog}" == "${stop_binlog}" ]; then
${mysql_bin}/mysqlbinlog --start-position=${start_pos} --stop-position=${stop_pos} ${back_src_dir}/${start_binlog} >> Incr_back$DATE.sql 
#跨binlog備份
else
startline=`awk "/${start_binlog}/{print NR}" ${back_src_dir}/mysql-bin.index`
stopline=`wc -l ${back_src_dir}/mysql-bin.index |awk '{print $1}'`
for i in `seq ${startline} ${stopline}`
do
binlog=`sed -n "$i"p ${back_src_dir}/mysql-bin.index |sed 's/.*\///g'`
case "${binlog}" in
"${start_binlog}")
${mysql_bin}/mysqlbinlog --start-position=${start_pos} ${back_src_dir}/${binlog} >> Incr_back$DATE.sql
;;
"${stop_binlog}")
${mysql_bin}/mysqlbinlog --stop-position=${stop_pos} ${back_src_dir}/${binlog} >> Incr_back$DATE.sql
;;
*)
${mysql_bin}/mysqlbinlog ${back_src_dir}/${binlog} >> Incr_back$DATE.sql
;; 
esac
done
fi
#解除表鎖定，并保存目前的binlog和position信息到position文件。
${mysql_bin}/mysql -u${user} -p${pass} --socket=${socket} -e "unlock tables"
cp now_position position
}

full_recov()
{
cd ${back_dir}
recov_file1=`ls | grep 'Full_back'`
${mysql_bin}/mysql -u${user} -p${pass} --socket=${socket} -e "use ${bak_db}; source ${back_dir}/${recov_file1};"
}

incre_recov()
{ 
cd ${back_dir}
recov_file2=`ls |grep 'Incr_back'` 
${mysql_bin}/mysql -u${user} -p${pass} --socket=${socket} -e "use ${bak_db}; source ${back_dir}/${recov_file2};"
}

while true
do
echo -e "\t\t**************************************"
echo
echo -e "\t\t\tWelcome to backup program!"
echo
echo -e "\t\t\t(1) Full Backup For MySQL"
echo -e "\t\t\t(2) Increment Backup For MySQL"
echo -e "\t\t\t(3) Recover From The Full Backup File"
echo -e "\t\t\t(4) Recover From The Increment Backup File"
echo -e "\t\t\t(5) Exit The Program!"
echo 
echo -e "\t\t**************************************"

read -p "Enter your choice:" choice
case $choice in
1)
echo "now! let's backup the data by full method......."
full_bak
echo "succeed!"
sleep 2
;;
2)
echo "now! let's backup the data by increment method......"
incre_bak
echo "succeed"
sleep 2
;;
3)
echo "now! let's recover from the full back file"
full_recov
echo "successful"
sleep 2
;;
4)
echo "now! let's recover from the increment backup file"
incre_recov
echo "successful"
sleep 2
;;
5)
break
;;
*)
echo "Wrong Option! try again!"
sleep 2
continue
;;
esac
done