我一直在创建一个异步服务器套接字，使用twisted发送和重用xml。
该应用程序运行良好！但是因为我的主要目标是将它嵌入到init.d脚本中并使其在后台运行我决定将其转换为“扭曲的应用程序”以便使用twistd运行它
# from twisted.internet import reactor
from twisted.internet.protocol import ServerFactory
from twisted.protocols.basic import LineOnlyReceiver
from twisted.application import internet, service
from xml.etree import ElementTree as ET
from aMuleClass import amulecmd
class DialogueProtocol(LineOnlyReceiver):
def connectionMade(self):
print "Connected: %s" % self.transport.getPeer().host
def lineReceived(self, line):
parsed= ET.XML(line)
if parsed.attrib['type'] == 'request':
if parsed.attrib['prompt'] == 'results':
self.transport.write(self.factory.mule.results())
elif parsed.attrib['prompt'] == 'downloads':
self.transport.write(self.factory.mule.downloads())
else:
print "Invalid request: %s\n" % line
else:
query= parsed.attrib['value']
if parsed.attrib['type'] == 'search':
print "must search for %s" % query
self.factory.mule.search(query)
elif parsed.attrib['type'] == 'cancel':
print "must cancel %s" % query
self.factory.mule.command("cancel %s" % query)
elif parsed.attrib['type'] == 'download':
print "must download %s" % query
self.factory.mule.command("download %s" % query)
class DialogueProtocolFactory(ServerFactory):
def __init__(self):
self.protocol= DialogueProtocol
self.mule= amulecmd()
def main():
factory= DialogueProtocolFactory()
port = 14000
#
daemon= internet.TCPServer(port, factory)
application= service.Application("aMuleSocket")
#
daemon.setServiceParent(application)
if __name__ == '__main__':
main()
使用“twistd -noy file”（debug）运行它可以正常工作。 问题是当我想要背景我的脚本！ （“twistd -y file”）socket dosent响应并且日志被pexpect中的错误填充，这是在我的amulecmd类中导入的... pexpect与终端提示应用程序通信并将答案返回到套接字..
日志文件：
2010/02/17 19:54 +0200 [-] Log opened.
2010/02/17 19:54 +0200 [-] twistd 2.5.0 (/usr/bin/python 2.5.2) starting up
2010/02/17 19:54 +0200 [-] reactor class: <class 'twisted.internet.selectreactor.SelectReactor'>
2010/02/17 19:54 +0200 [-] Loading aMuleSocket.tac...
2010/02/17 19:54 +0200 [-] Starting parent
2010/02/17 19:54 +0200 [-] Loaded.
2010/02/17 19:54 +0200 [-] __builtin__.DialogueProtocolFactory starting on 2000
2010/02/17 19:54 +0200 [-] Starting factory <__builtin__.DialogueProtocolFactory instance at 0x82dbd8c>
2010/02/17 19:54 +0200 [__builtin__.DialogueProtocolFactory] Connected: 192.168.0.2
2010/02/17 19:54 +0200 [DialogueProtocol,0,192.168.0.2] Unhandled Error
Traceback (most recent call last):
File "/usr/lib/python2.5/site-packages/twisted/python/log.py", line 48, in callWithLogger
return callWithContext({"system": lp}, func, *args, **kw)
File "/usr/lib/python2.5/site-packages/twisted/python/log.py", line 33, in callWithContext
return context.call({ILogContext: newCtx}, func, *args, **kw)
File "/usr/lib/python2.5/site-packages/twisted/python/context.py", line 59, in callWithContext
return self.currentContext().callWithContext(ctx, func, *args, **kw)
File "/usr/lib/python2.5/site-packages/twisted/python/context.py", line 37, in callWithContext
return func(*args,**kw)
--- <exception caught here> ---
File "/usr/lib/python2.5/site-packages/twisted/internet/selectreactor.py", line 139, in _doReadOrWrite
why = getattr(selectable, method)()
File "/usr/lib/python2.5/site-packages/twisted/internet/tcp.py", line 362, in doRead
return self.protocol.dataReceived(data)
File "/usr/lib/python2.5/site-packages/twisted/protocols/basic.py", line 149, in dataReceived
self.lineReceived(line)
File "aMuleSocket.tac", line 19, in lineReceived
self.transport.write(self.factory.mule.downloads())
File "/home/hecyra/amule_scripts/amule-remote-read-only/server/aMuleClass.py", line 60, in downloads
list= self.command('show DL').splitlines()
File "/home/hecyra/amule_scripts/amule-remote-read-only/server/aMuleClass.py", line 42, in command
self.prompt()
File "/home/hecyra/amule_scripts/amule-remote-read-only/server/aMuleClass.py", line 27, in prompt
self.process.expect('aMulecmd')
File "/usr/lib/python2.5/site-packages/pexpect.py", line 1064, in expect
return self.expect_list(compiled_pattern_list, timeout, searchwindowsize)
File "/usr/lib/python2.5/site-packages/pexpect.py", line 1116, in expect_list
c = self.read_nonblocking (self.maxread, timeout)
File "/usr/lib/python2.5/site-packages/pexpect.py", line 656, in read_nonblocking
if not self.isalive():
File "/usr/lib/python2.5/site-packages/pexpect.py", line 914, in isalive
raise ExceptionPexpect ('isalive() encountered condition where "terminated" is 0, but there was no child process. Did someone else call waitpid() on our process?')
pexpect.ExceptionPexpect: isalive() encountered condition where "terminated" is 0, but there was no child process. Did someone else call waitpid() on our process?
它可能是什么？我只需要背景这个脚本:(看起来很简单
答案 0 :(得分：3)
您在守护之前会产生子进程。守护进程后，该子进程现在是init的子进程，而不是守护进程的子进程。
您需要子类from twisted.application.service import Service并在startService中生成子进程，该进程将在守护进程后调用。
ÁLa：Twisted network client with multiprocessing workers?
编辑：实施
我无法完全测试，因为我没有你的amulecmd，但尝试更像这样的事情：
#!/usr/bin/env python
# vim:ai:et:ts=2:sw=2:bg=dark
from twisted.internet import protocol
from twisted.protocols.basic import LineOnlyReceiver
from twisted.application import service
from xml.etree import ElementTree as ET
from aMuleClass import amulecmd
class DialogueProtocol(LineOnlyReceiver):
def connectionMade(self):
print "Connected: %s" % self.transport.getPeer().host
def lineReceived(self, line):
parsed= ET.XML(line)
if parsed.attrib['type'] == 'request':
if parsed.attrib['prompt'] == 'results':
self.transport.write(self.factory.mule.results())
elif parsed.attrib['prompt'] == 'downloads':
self.transport.write(self.factory.mule.downloads())
else:
print "Invalid request: %s\n" % line
else:
query= parsed.attrib['value']
if parsed.attrib['type'] == 'search':
print "must search for %s" % query
self.factory.mule.search(query)
elif parsed.attrib['type'] == 'cancel':
print "must cancel %s" % query
self.factory.mule.command("cancel %s" % query)
elif parsed.attrib['type'] == 'download':
print "must download %s" % query
self.factory.mule.command("download %s" % query)
class MyService(service.Service):
def __init__(self,port=14000):
self.port = port
def startService(self):
self.factory = protocol.Factory()
self.factory.protocol = DialogueProtocol
from twisted.internet import reactor
reactor.callWhenRunning(self.startListening)
def startListening(self):
self.factory.mule = amulecmd()
from twisted.internet import reactor
self.listener = reactor.listenTCP(self.port,self.factory)
print "Started listening"
def stopService(self):
self.listener.stopListening()
if __name__ == '__main__':
pass
else:
application = service.Application("aMuleSocket")
services = service.IServiceCollection(application)
MyService().setServiceParent(services)