python3 实现应用启动及关键字检测

我们在应用的时候，经常需要实现应用启动及检测功能。我们启动命令
python3 restart_and_watchlog.py “sh bin/start.sh” “logs/log.log” “Started Application in” 20
第一个restart_and_watchlog.py 检测脚本
sh bin/start.sh 应用启动命令
logs/log.log 应用启动日志
Started Application in 关键字
20 过期时间20s

# -*- coding: utf-8 -*-#

#-------------------------------------------------------------------------------
# Name:         restart_and_watchlog.py
# Description:
# Author:       Administrator
# Date:         2022/3/13
#-------------------------------------------------------------------------------

import sys
import importlib
import subprocess
import signal
import os
from collections import deque

importlib.reload(sys)

# python3 restart_and_watchlog.py "sh bin/start.sh" "logs/log.log" "Started Application in" 20
#'sh app.sh restart'
start_shell=sys.argv[1]
#'servicelog'
log_file_name=sys.argv[2]
#'Started DemoApplication in'
keywork_success =sys.argv[3]
time_out: int=sys.argv[4]

def myHandler(signum,frame):
    raise Exception("TimeoutError,no found keyword of success.")


logline_queue=deque(maxlen=30)


def log_search(logfile,search_content):
    print("#"*50)
    #防止读取到老日志
    shell_string='tail -n 10 -F '+logfile
    print('shell_string:'+shell_string)
    working_file=subprocess.Popen(['tail','-n','10','-F',logfile],stdout=subprocess.PIPE,stderr=subprocess.PIPE)
    print("execute end")
    try:
        while True:
            line=str(working_file.stdout.readline())
            # process data
            logline_queue.append(line)
            if len(line)>0:
                if search_content in line:
                    print("success keyword of success:"+line)
                    return True
            else:
                return False
    finally:
        os.kill(working_file.pid,signal.SIGKILL)


def log_search_timeout(logfile,seach_content,time_out=10):
    try:
        signal.signal(signal.SIGALRM,myHandler)
        signal.alarm(int(time_out))
        result=log_search(logfile,seach_content)
        signal.alarm(0)
    except Exception as e:
        print("execute log search exception",e)
        return False
    return True

def execute_shell(shellstring):
    print("#"*50)
    print("execute start shell:"+shellstring)
    write_file=subprocess.Popen(shellstring,shell=True,stdout=subprocess.PIPE,stderr=subprocess.PIPE)
    print(write_file.stdout.read())
    print("#"* 50)


execute_shell(start_shell)
#检查脚本执行日志，可以用阻塞式脚本,获取到期望的字符串，就退出

result=log_search_timeout(logfile=log_file_name,seach_content=keywork_success,time_out=time_out)

print("execute shell log is:"+str(result))

if result:
    exit(0)

else:
    if len(logline_queue)>0:
        print("error log content:")
        for logline in logline_queue:
            print(logline)
        pass

    exit(-1)

验证结果：

最后

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