#!/bin/bash
# 假设将sakila数据库名改为new_sakila
# MyISAM直接更改数据库目录下的文件即可


source /etc/profile
declare -i cur_diff=0 min_diff=3600

time_diff() {
  cur_sec=`date '+%s'`
  echo $cur_sec

  today=$(date "+%Y-%m-%d")
  today_time=`date -d "$today" +%s`
  echo $today_time

  cur_diff=`expr $cur_sec - $today_time`
}

time_diff
echo $cur_diff,${min_diff}

if [[ $cur_diff -gt ${min_diff} ]]; then
  echo 'can purge'
else
  echo '请等到凌晨一点后删除'
  exit
fi

function slave_running() {
    ra=`mysql -uroot -pXTZ@shop@951688 --host=$1 -e "show slave status\G; " | grep Slave_IO_Running:  | awk '{print $2}'`
    rb=`mysql -uroot -pXTZ@shop@951688 --host=$1 -e "show slave status\G; " | grep Slave_SQL_Running: | awk '{print $2}'`

    # shellcheck disable=SC2068
    for a in ${ra[@]}
    do
        if [[ $a != 'Yes' ]];then
            return 0
        fi
    done

    # shellcheck disable=SC2068
    for b in ${rb[@]}
    do
        if [[ $b != 'Yes' ]];then
            return 0
        fi
    done

    return 1
}

function slave_behind_match() {
    behinds=`mysql -uroot -pXTZ@shop@951688 --host=$host -e "show slave status\G; " | grep Seconds_Behind_Master: | awk '{print $2}'`

    # shellcheck disable=SC2068
    for ssecs in ${behinds[@]}
    do
      secs=`echo $ssecs | xargs`
      echo Seconds_Behind_Master=$secs
      echo cur_diff=$cur_diff
      diff=`expr $cur_diff - 3600`

      if [[ $secs -gt $diff || $secs -gt 1800 ]];then
          echo behind_master=$secs
          return 0
      fi
    done

    return 1
}

#ra=`mysql -uroot -pXTZ@shop@951688 --host=172.26.80.10 -e "show slave status\G; " | grep Slave_IO_Running: | awk '{print $2}'`
#mysql -uroot -pXTZ@shop@951688 --host=172.26.80.8 -e "show slave status\G; " | grep Seconds_Behind_Master:  | awk '{print $2}'

#master = '172.26.80.10'
slave_hosts=(${XYZ_SLAVE_HOSTS//:/ })
#(172.26.80.8 172.26.80.6)

# shellcheck disable=SC2068
for host in ${slave_hosts[@]}
do
  echo $host
  slave_running $host
  running=$?

  if [[ $running == 0 ]];then
    echo "slave ${host} has stoped"
    exit
  fi

  slave_behind_match $host
  behind_match=$?

  if [[ $behind_match == 0 ]];then
    echo "slave ${host} 延迟太大"
    exit
  fi
  echo $host can purge
done

today=$(date "+%Y-%m-%d")
command="PURGE master LOGS BEFORE '${today} 00:00:00';"
echo $command

# shellcheck disable=SC2068
for host in ${slave_hosts[@]}
do
  echo $host:$command
  mysql -uroot -pXTZ@shop@951688 --host=$host -e "$command"
done