python telnetlib模块:读取并等待响应
我遇到了与此海报类似的问题: 注意下面的回复和我的回复 本质上,telnetlib不允许我在调用任何read函数时读取整个响应python telnetlib模块:读取并等待响应,python,response,wait,telnetlib,Python,Response,Wait,Telnetlib,我遇到了与此海报类似的问题: 注意下面的回复和我的回复 本质上,telnetlib不允许我在调用任何read函数时读取整个响应 在使用select.select后调用telnet.read\u时,在while循环中选择[telnetobject],[],以确保读取可用,我只会得到几个字符。到目前为止,我能想出的唯一解决办法是利用时间。睡眠,但这是一个太粗糙的解决方案,我正在寻找更适合的。感谢您的帮助……我想我也遇到了同样的问题,我希望这些信息能有所帮助。在我的例子中,我正在连接Maya中的mel
在使用select.select后调用telnet.read\u时,在while循环中选择[telnetobject],[],以确保读取可用,我只会得到几个字符。到目前为止,我能想出的唯一解决办法是利用时间。睡眠,但这是一个太粗糙的解决方案,我正在寻找更适合的。感谢您的帮助……我想我也遇到了同样的问题,我希望这些信息能有所帮助。在我的例子中,我正在连接Maya中的mel和python端口,因此我不知道此体验是否对您和您的情况有用 向我展示了我尝试执行的I/O根本不需要Telnet/telnetlib,并推荐了它 结果表明,并非所有出现在服务器端的输出都可供客户端读取。在我使用asynchat作为第二种意见之前,我不知道会发生这种情况,并且发现无论我如何发送打印“Complete Command”的输出,我仍然没有收到。我试图编写打印“Complete Command”并读取结果,以了解上一个命令何时完成 我最终调用了mel的警告命令,该命令确实会生成客户端可读的输出。发送无辜的数据作为警告是相当令人讨厌的,但幸运的是这是一个内部工具 telnetlib似乎不会对写入进行排队。因此,我计划将两个命令背靠背地发送到真正的命令,然后命令完整公告并不总是有效。因此,似乎只有当您确切地知道要读取的输出,或者在怀疑输出完成之前愿意睡觉时,才可以读取telnetlib输出。但是,asynchat.push肯定会按预期的方式进行写入。 一个样本,要用一大粒盐来采集,因为我还在想这个问题:
class mayaClient(asynchat.async_chat) :
...
def __init__(self, sock, clientType):
asynchat.async_chat.__init__(self, sock=sock)
self.clientType = clientType
self.ibuffer = []
self.obuffer = ""
self.set_terminator("\r\n")
self.cumulativeResponse = ""
@classmethod
def withSocket(cls, host, clientType, log) :
melSocket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
portNumber = cls.MEL_PORT_NUMBER if clientType == cls.MEL else cls.PYTHON_PORT_NUMBER
melSocket.connect((host, portNumber))
return cls(melSocket, clientType, log)
#############################################################
# pushAndWait
#############################################################
def pushAndWait(self, command, timeout=60) :
"""
ACTION: Push a command and a "command complete" indicator
If command completed, return number of milliseconds it took
If command timed out without completing, return -1
INPUT: command as string
description (optional) as string for more informative logging
timeout in seconds as int after which to give up
OUTPUT: X milliseconds if command completed
-1 if not
"""
self.found_terminator()
incrementToSleep = .001
self.push("%s\r\n"%command)
responseToSeek = "Command Complete"
self.push('Whatever command is going to create readable output for %s`); \r\n'%responseToSeek)
timeSlept = 0
while responseToSeek not in self.currentBufferString() and timeSlept < timeout :
self.read()
timeSlept += incrementToSleep
time.sleep(incrementToSleep)
if responseToSeek in self.currentBufferString() :
return timeSlept
return -1
#############################################################
# read
#############################################################
def read(self) :
"""
ACTION: Reads the current available output
and stores it in buffer
"""
try :
self.collect_incoming_data(self.recv(1024))
except Exception, e :
# Don't worry about it -- just means there's nothing to read
#
pass
#############################################################
# currentBuffer
#############################################################
def currentBuffer(self) :
return self.ibuffer
#############################################################
# currentBufferString
#############################################################
def currentBufferString(self) :
return "".join(self.ibuffer)
#############################################################
# collect_incoming_data
#############################################################
def collect_incoming_data(self, data):
"""Buffer the data"""
self.ibuffer.append(data)
#############################################################
# found_terminator
#############################################################
def found_terminator(self):
print "Clearing --%s...-- from buffer"%self.currentBufferString()[0:20]
self.ibuffer = []
派对迟到了,但这在telnetlib中是可行的。下面将阅读所有行,直到没有剩余内容。timeout=0.1会增加响应到达的时间
try:
while True: # read until we stop
message = session.read_until(b'\n', timeout=0.1)
if message == b'': # check if there was no data to read
break # now we stop
print(message) # print message if not stopped
except EOFError: # If connection was closed
print('connection closed')
或者,如果您总是想等待响应:
try:
message = session.read_until(b'\n') # Will not timeout until you have response
print(message)
while True: # read until we stop
message = session.read_until(b'\n', timeout=0.1)
if message == b'': # check if there was no data to read
break # now we stop
print(message) # print message if not stopped
except EOFError: # If connection was closed
print('connection closed')