捕捉即将死去的过程 [英] Catching a dying process in pexpect

问题描述

我正在写一些pexpect的东西，这些东西基本上是通过telnet发送命令的.

I'm writing some pexpect stuff that's basically sending commands over telnet.

但是，我的telnet会话可能会死掉(由于网络问题，电缆被拔掉了等等).

But, it's possible that my telnet session could die (due to networking problems, a cable getting pulled, whatnot).

我该如何初始化telnet会话，以便如果它死了，我可以捕获它并告诉它重新连接，然后继续执行它所在的代码.

How do I initialize a telnet session such that, if it dies, I can catch it and tell it to reconnect and then continue execution of the code where it was at.

这可能吗?

推荐答案

恕我直言，通常使用诸如 telnetlib ，但pexpect中的有效咒语是:

IMHO, you're normally better-off with a currently-maintained library like exscript or telnetlib, but the efficient incantation in pexpect is:

import pexpect as px

cmds = ['cmd1', 'cmd2', 'cmd3']
retcode = -1
while (retcode<10):
    if (retcode<2):
        child = px.spawn('telnet %s %s' % (ip_addr,port))
    lregex = '(sername:)'            # Insert regex for login prompt here
    pregex = '(prompt1>)|(prompt2$)' # Insert your prompt regex here
    # retcode = 0 for px.TIMEOUT, 1 for px.EOF, 2 for lregex match...
    retcode = child.expect([px.TIMEOUT, px.EOF, lregex, pregex],timeout = 10)
    if (retcode==2):
        do_login(child)  # Build a do_login() method to send user / passwd
    elif (2<retcode<10) and (len(cmds)>0):
        cmd = cmds.pop(0)
        child.sendline(cmd)
    else:
        retcode = 10

这篇关于捕捉即将死去的过程的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！