我正在开发一个Windows服务来监控来自控制系统的信号。我用两个类（IOSignal和Control）对系统进行了建模。每个Control实例都有一些与之关联的IOSignals实例。当与特定控件关联的所有IOSignals处于特定状态时，我希望服务执行某些操作。在我的真实代码中，它将在数据库中注册此事件。为了解释我的问题，我在原始代码中创建了一个非常简化的版本。 问题是，当它作为服务运行时，我想存储所有Control和IOSignal实例的状态，所以当我重新启动服务时，我可以记住＆＃34;停止时我的系统状态。我正在使用泡菜来做到这一点。似乎酸洗部分工作显然我可以在另一个脚本中打开文件并检索我的对象的信息。 我的系统的复杂性在于我将IOSignals实例存储在每个Control对象中，反之亦然。 当我明星服务似乎工作正常，但当我重新启动它时，我开始收到错误消息，重新创建的对象没有一些属性（主要是＆＃39; d＆＃39;和＃39;记录器＆＃39;） 我已经超越了 getstae 和 setstate 方法来尝试使pickle工作，但我认为我错过了一些东西。我按照python文档（https://docs.python.org/2.0/lib/pickle-example.html）
中给出的说明进行操作这是我的类的代码（我将它们保存在名为Observer.py的文件中）
# -*- coding: utf-8 -*-
"""
Created on Wed Aug 2 11:07:28 2017
@author: me
"""
from logging import getLogger
#import logging
class IOSignal(object):
def __init__(self,tag,val='True'):
self.tag=tag
self.value=val
self.CONTROLS=[]
#logger
self.logger=getLogger('teste.IOSignals')
# dict to serialize
self.d={}
self.d['tag']=self.tag
self.d['value']=self.value
self.d['CONTROLS']=self.CONTROLS
def getTag(self):
return self.tag
def getValue(self):
return self.value
def UpdateIOSinal(self,val):
self.value=val
try:
for control in self.CONTROLS:
#self.logger.debug('updating controls')
control.update()
except Exception as e:
self.logger.error("Error updating signal - ErrMsg -> {}".format(str(e)))
def AppendControl(self,control):
self.CONTROLS.append(control)
def UpdateControls(self):
for control in self.CONTROLS:
control.update()
def __getstate__(self):
return self.d
def __setstate__(self, d):
self.tag=d['tag']
self.value=d['value']
self.CONTROLS=d['CONTROLS']
self.__dict__= d
class Control(object):
def __init__(self,tag,state=False):
self.tag=tag
self.state=state
self.IOSignals={}
#logger
self.logger=getLogger('teste.CONTROLS')
# dict to serialize
self.d={}
self.d['tag']=self.tag
self.d['state']=self.state
self.d['IOSignals']=self.IOSignals
def getTag(self):
return self.tag
def getState(self):
return self.state
def register_signal(self,signal):
self.IOSignals[len(self.IOSignals)]=signal
def update(self):
try:
I=len([e.value for e in self.IOSignals.values() if e.value=='False'])
if I==len(self.IOSignals):
self.logger.info("Control {} actuated".format(self.tag))
except Exception as e:
self.logger.error("Error updating Contro - ErrMsg -> {}".format(str(e)))
def __getstate__(self):
return self.d
def __setstate__(self, d):
self.tag=d['tag']
self.state=d['state']
self.IOSignals=d['IOSignals']
self.__dict__= d
这是创建服务和使用Observer的代码。我叫它teste_service.py 安装它在命令行中键入以下命令＆＃34; python c：\ pathtofile \ teste_service.py install＆＃34;并将其运行在Windows服务中。 该服务的名称是TEST_Event_Service。
# -*- coding: utf-8 -*-
"""
Created on Thu Jul 27 09:07:29 2017
@author: me
"""
from Observer import IOSignal
from Observer import Control
import os
import threading
import logging
import logging.config
import win32api
import win32service
import win32serviceutil
import win32event
import random
import time
import pickle
class InterruptedException(Exception):
pass
class WorkerThread(threading.Thread):
def __init__(self, controller,dCONFIG):
self._controller = controller
self._stop = threading.Event()
super(WorkerThread, self).__init__()
self.dCONFIG=dCONFIG
self.dIO=dCONFIG['dIO']
self.dCTRL=dCONFIG['dCTRL']
#logger
self.logger=logging.getLogger('teste.SERVICE')
def stop(self):
self._stop.set()
def stopped(self):
return self._stop.isSet()
def saveCACHE(self):
try:
f=open(r'C:\TIER3\teste\teste.pkl','wb')
pickle.dump(self.dCONFIG,f,protocol=4)
f.close()
except Exception as e:
self.logger.error("Error saving cache - ErrMsg -> {}".format(str(e)))
def getCONFIG(self):
return self.dCONFIG
def run(self):
try:
# simulater signal state based on a random number generator
for signal in self.dIO.values():
r=random.random()
if r>0.5:
signal.UpdateIOSinal('False')
else:
signal.UpdateIOSinal('True')
#updating dCONFIG to pickle it
self.dCONFIG['dIO']=self.dIO
self.dCONFIG['dCTRL']=self.dCTRL
try:
self.saveCACHE()
except Exception as e:
self.logger.error("Error saving cache - ErrMsg -> {}".format(str(e)))
#self.logger.info('run finished')
time.sleep(10)
except InterruptedException as e:
# We are forcefully quitting
self.logger.error('Interruption Exception - {}'.format(str(e)))
pass
except Exception as e:
self.logger.error('Unexpected Error - {}'.format(str(e)))
#self.logger.error(e)
pass
# Oh oh, did not anticipate this, better report to Windows or log it
finally:
#pass
# Close/release any connections, handles, files etc.
# OK, we can stop now
win32event.SetEvent(self._controller)
class test_service(win32serviceutil.ServiceFramework):
_svc_name_ = "pyTEST"
_svc_display_name_ = "TEST Event service"
_svc_description_ = "Service to teste python service"
def __init__(self, args):
win32serviceutil.ServiceFramework.__init__(self, args)
self.hWaitStop = win32event.CreateEvent(None, 0, 0, None)
self.hWaitDone = win32event.CreateEvent(None, 0, 0, None)
self.dCONFIG={}
#------------------------------------------------------------------------------
# Creating logger
#------------------------------------------------------------------------------
logging.config.fileConfig(r'c:\tier3\teste\teste_logging.conf')
# create logger
self.logger = logging.getLogger('teste')
self.logger.info(self._svc_name_ + " - STARTED!")
#creating some IOSignals and Controls
dIO={}
dCTRL={}
try:
if os.path.exists(r'C:\TIER3\teste\teste.pkl'):
f=open(r'C:\TIER3\teste\teste.pkl','rb')
self.dCONFIG=pickle.load(f)
dIO=self.dCONFIG['dIO']
dCTRL=self.dCONFIG['dCTRL']
f.close()
else:
dIO[1]=IOSignal('IO1')
dIO[2]=IOSignal('IO2')
dIO[3]=IOSignal('IO3')
dIO[4]=IOSignal('IO4')
dIO[5]=IOSignal('IO5')
dIO[6]=IOSignal('IO6')
dIO[7]=IOSignal('IO7')
dIO[8]=IOSignal('IO8')
dCTRL[1]=Control('CTRL1')
dCTRL[2]=Control('CTRL2')
dCTRL[3]=Control('CTRL3')
dCTRL[4]=Control('CTRL4')
dIO[1].AppendControl(dCTRL[1])
dIO[2].AppendControl(dCTRL[1])
dIO[3].AppendControl(dCTRL[2])
dIO[4].AppendControl(dCTRL[2])
dIO[5].AppendControl(dCTRL[3])
dIO[6].AppendControl(dCTRL[3])
dIO[7].AppendControl(dCTRL[4])
dIO[8].AppendControl(dCTRL[4])
dCTRL[1].register_signal(dIO[1])
dCTRL[1].register_signal(dIO[2])
dCTRL[2].register_signal(dIO[3])
dCTRL[2].register_signal(dIO[4])
dCTRL[3].register_signal(dIO[5])
dCTRL[3].register_signal(dIO[6])
dCTRL[4].register_signal(dIO[7])
dCTRL[4].register_signal(dIO[8])
self.dCONFIG={}
self.dCONFIG['dIO']=dIO
self.dCONFIG['dCTRL']=dCTRL
except Exception as e:
self.logger.error("Error opening teste.pkl - ErrMsg -> {}".format(str(e)))
def SvcStop(self):
self.ReportServiceStatus(win32service.SERVICE_STOP_PENDING)
win32event.SetEvent(self.hWaitStop)
def SvcDoRun(self):
import servicemanager
servicemanager.LogMsg(servicemanager.EVENTLOG_INFORMATION_TYPE,
servicemanager.PYS_SERVICE_STARTED,(self._svc_name_, ''))
#create worker 1st run
self.worker = WorkerThread(self.hWaitDone,self.dCONFIG)
self.worker.setDaemon=True
self.worker.start()
while True:
rc = win32event.WaitForMultipleObjects([self.hWaitStop, self.hWaitDone],False,win32event.INFINITE)
#self.logger.debug('rc = {}'.format(rc))
# Check to see if self.hWaitStop happened as part of Windows Service Management
if rc == 0:
# Stop signal encountered
self.logger.info(self._svc_name_ + " - STOPPED!")
servicemanager.LogInfoMsg(self._svc_name_ + " - STOPPED!") #For Event Log
break
if rc == 1:
#create worker
self.dCONFIG=self.worker.getCONFIG()
self.worker = WorkerThread(self.hWaitDone,self.dCONFIG)
self.worker.setDaemon=True
self.worker.start()
def ctrlHandler(ctrlType):
return True
if __name__ == '__main__':
win32api.SetConsoleCtrlHandler(ctrlHandler, True)
win32serviceutil.HandleCommandLine(test_service)
这是记录集
[loggers]
keys=root,teste
[handlers]
keys=logfile,consoleHandler
[formatters]
keys=simpleFormatter,logfileformatter
[logger_root]
level=DEBUG
handlers=consoleHandler
[logger_teste]
level=DEBUG
handlers=logfile
qualname=teste
propagate=0
[formatter_logfileformatter]
format=%(asctime)s %(name)-12s: %(levelname)s %(message)s
[formatter_simpleFormatter]
format=%(asctime)s - %(name)s - %(levelname)s - %(message)s
datefmt=
[handler_consoleHandler]
class=StreamHandler
level=DEBUG
formatter=simpleFormatter
args=(sys.stdout,)
[handler_logfile]
class=handlers.RotatingFileHandler
level=DEBUG
args=(r'C:\tier3\teste\pyteste.log','a',5000000,20)
formatter=logfileformatter
我认为我的问题出在 getstate 和 setstate 定义中。
这是我收到的错误消息的示例。
2017-08-02 22:58:00,348 teste.SERVICE: ERROR Error saving cache - ErrMsg -> 'IOSignal' object has no attribute 'd'
2017-08-02 22:58:10,366 teste.SERVICE: ERROR Unexpected Error - 'IOSignal' object has no attribute 'logger'
任何人都有一些想法我的问题在哪里？
答案 0 :(得分：0)
我设法找到了一个不像我想的那样优雅的解决方案。由于没有完美地重新创建实例，我每次运行服务时都会创建所有实例，并检查是否有缓存文件。如果有，我用缓存中的信息调整实例状态。这是Observer.py的修改代码。我创建了新的方法来设置我需要的值。