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捕捉 pexpect 中的死亡过程

发布于 2024-10-31 04:18:42 字数 164 浏览 3 评论 0原文

我正在写一些 pexpect 的东西，基本上是通过 telnet 发送命令。

但是，我的 telnet 会话可能会终止（由于网络问题、电缆被拉断等）。

如何初始化 telnet 会话，以便在它终止时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。

这可能吗？

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坚持沉默 2024-11-07 04:18:43

我这样做了，它起作用了：

def telnet_connect():
    print "Trying to connect via telnet..."
    telnet_connecting = pexpect.spawn('telnet localhost 10023', timeout=2)
    while 1:
        try:
            telnet_connecting.expect('login: ')
            break
        except:
            telnet_connecting = telnet_connect()
            break
    return telnet_connecting

递归 FTW？

I did this, and it worked:

def telnet_connect():
    print "Trying to connect via telnet..."
    telnet_connecting = pexpect.spawn('telnet localhost 10023', timeout=2)
    while 1:
        try:
            telnet_connecting.expect('login: ')
            break
        except:
            telnet_connecting = telnet_connect()
            break
    return telnet_connecting

Recursion FTW?

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拥有 2024-11-07 04:18:42

恕我直言，您通常最好使用当前维护的库，例如 exscript< /a> 或 telnetlib，但是 < 中的高效咒语代码>pexpect是：

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

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

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