Shell script timing task realizes interface monitoring (response time, response code) alarm

The script is implemented based on curl and is used to detect the interface or page request response code and response time. If you try three exceptions, an alarm will be triggered, and the alarm will not be triggered repeatedly. Prompt when the alarm recovers. The detection frequency is configured by the crontab timing task.

#!/bin/bash
# 默认参数 api接口
check_api=${1:-http://xxxx/api}
# 默认参数 超时时间5s
timeout=${2:-5}
#告警状态文件
shell_path=/xxx/xxx/shell/check_api_state
#告警短信接口
msg_api=http://xxx/sendSmsApi

echo "-----------------------check api start-----------------------"
echo `date "+%Y-%m-%d %H:%M:%S"`

i=1
error_times=0
#第一次正常则返回，有异常则进行三次检测
while [ $i -le 3 ];do
  #调用接口计时
  start_time=`date "+%Y-%m-%d %H:%M:%S"`
  #curl $check_api 进行接口测试
  response_code=`curl -I -s -m 10 $check_api |grep HTTP|awk '{print $2}'`
  end_time=`date "+%Y-%m-%d %H:%M:%S"`
  #计算响应时间
  st=`date -d  "$start_time" +%s`
  et=`date -d  "$end_time" +%s`
  sumTime=$(($et-$st))
  echo "接口:$check_api，第$i次接口检查"
  echo "开始时间:$start_time,结束时间:$end_time。请求用时:$sumTime s,响应码:$response_code。"
  ((i++))
  # 判断接口响应时长、响应码是否正常
  if [ $sumTime -ge $timeout -o $response_code -ne '200' ];then
	  ((error_times++))
	#接口异常（可能是网络波动）等待3s 进行下一次检测
    sleep 3
  else
    echo "检查正常！"
    break
  fi
done


warn_time=`echo ${
     
     start_time// /#}`
warn_msg="【xxx告警】接口$check_api异常，请求耗时$sumTime(s)，响应码为$response_code，告警时间:$warn_time。" 
ok_msg="【xxx告警】接口$check_api已恢复，请求耗时$sumTime(s)，响应码为$response_code，恢复时间:$warn_time。"

api_md5=`echo -n $check_api|md5sum|cut -d ' ' -f1`
is_create_file=0
if [ -f "$shell_path/$api_md5.state" ]
then
  echo "state file is already exists"
else
  touch "$shell_path/$api_md5.state"
  echo 0 > $shell_path/$api_md5.state
  is_create_file=1
fi
state=`cat $shell_path/$api_md5.state`
#echo "$check_api state_code $state"

echo "异常次数 $error_times,告警状态 $state [0未告警，1已告警]"

#三次检测全部异常 进行短信告警
if [ $error_times -eq 3 ] && [ $state -eq 0 ]
then
  echo 1 > $shell_path/$api_md5.state
  echo "发送短信 $warn_msg"
  #curl 调用接口发送告警短信
  curl -H "Content-Type: application/json" -X POST -d '{"phoneNo": "131xxxxxxxx","sms": "'$warn_msg'"}' $msg_api
fi


if [ $is_create_file -eq 0 ] && [ $state -eq 1 ] && [ $sumTime -le $timeout ] && [ $response_code -eq '200' ]
then
  echo 0 > $shell_path/$api_md5.state
  echo "发送短信 $ok_msg"
  curl -H "Content-Type: application/json" -X POST -d '{"phoneNo": "131xxxxxxxx","sms": "'$ok_msg'"}' $msg_api
fi

echo `date "+%Y-%m-%d %H:%M:%S"`
echo "-----------------------check api end-----------------------"