Question

我的问题是，在生成进程之后，子进程正在循环以从其stdin获取数据。我想使用Echo.Process.pipes [0] .write（data）或Echo.Process.writeToChild（0，data）向它写入新数据，但两者都不起作用。有人会解释发生了什么吗？或者我该如何解决这个问题？

这是我得到的错误：

--- <exception caught here> ---
  File "/usr/local/encap/python-2.6.4/lib/python2.6/site-packages/Twisted-9.0.0-py2.6-linux-x86_64.egg/twisted/internet/selectreactor.py", line 146, in _doReadOrWrite
    why = getattr(selectable, method)()
  File "/usr/local/encap/python-2.6.4/lib/python2.6/site-packages/Twisted-9.0.0-py2.6-linux-x86_64.egg/twisted/internet/tcp.py", line 460, in doRead
    return self.protocol.dataReceived(data)
  File "pp1.py", line 30, in dataReceived
    Echo.Process.pipes[0].write(data)
exceptions.KeyError: 0

谢谢，

Q

from sys import executable
from os import environ
import os
from twisted.internet import reactor
from twisted.internet.protocol import Protocol
from twisted.internet.protocol import Factory
from twisted.internet import protocol
import sys

implementation = """\
import os
import time
import sys

print "in child", os.getpid()

while (True):
        a = raw_input("")
        if a: print a
"""


class Echo(Protocol):
    Process = None
    def dataReceived(self, data):
        if Echo.Process == None:
                pp = MyPP()
                Echo.Process = reactor.spawnProcess(pp, executable, [executable, "-c", implementation, data], env=environ, childFDs = {0:1, 1:1, 2:2})
        else:
                Echo.Process.pipes[0].write(data)
                #Echo.Process.writeToChild(0,data)
        self.transport.write(data)

class EchoFactory(Factory):
    def buildProtocol(self, addr):
        return Echo()

class MyPP(protocol.ProcessProtocol):
    def connectionMade(self):
        print "connectionMade!"
    def outReceived(self, data):
        print "out"
    def errReceived(self, data):
        print "error", data
    def processExited(self, reason):
        print "processExited"
    def processEnded(self, reason):
        print "processEnded"
        print "quitting"

reactor.listenTCP(8200, EchoFactory())
print 'in parent', os.getpid()
reactor.run()

Answer 1

在每个传入连接上创建一个新进程，并将所有输入数据重定向到进程'stdin：

#!/usr/bin/python
from twisted.internet import reactor

from twisted.internet import protocol

class Echo(protocol.Protocol):
    def connectionMade(self):
        self.pp = MyPP()
        reactor.spawnProcess(self.pp, 'cat', ['cat'])
    def dataReceived(self, data):
        self.pp.transport.write(data)
    def connectionLost(self, reason):
        self.pp.transport.loseConnection()

class MyPP(protocol.ProcessProtocol):
    def connectionMade(self):
        print "connectionMade!"
    def outReceived(self, data):
        print "out", data,
    def errReceived(self, data):
        print "error", data,
    def processExited(self, reason):
        print "processExited"
    def processEnded(self, reason):
        print "processEnded"
        print "quitting"

factory = protocol.Factory()
factory.protocol = Echo
reactor.listenTCP(8200, factory)
reactor.run()

Answer 2

不要将childFDs传递给spawnProcess，也不要使用生成的流程传输对象的pipes属性。这些都不符合你的想法。如果您放弃使用childFDs并切换回writeToChild，您将获得所需的行为。

Twisted Python：无法写入正在运行的衍生进程

2 个答案: