[Tutor] telnet read_until problems

[Bob Gailer]

Chris Hallman wrote:
>
> I've written a program that tests ISDN dial backup at 1,000 locations. 
> I've broken up the logic into server functions within a threading 
> class (i.e. logon, get interfaces, get dial string, etc.). At 999 
> locations, the following code extract the first of three dial strings:
>
>     def GetDialString(self):
>         """ This function extracts the dial string."""
>         self.tn.write("term len 0\n")
>         self.tn.expect([self.host.upper() + "#"], 7)
>         self.tn.write("sh dialer | i Default\n")
>         self.data = self.tn.read_until(self.host.upper() + "#", 7)
>         print self.data
>         match = re.search("\d\d\d\d\d\d\d\d\d\d\d+", self.data)
>         if match is not None:
>             rc = match.group()
>         else:
>             rc = "missing"
>         return rc
>
> One location doesn't return it's dial string. In Idle, the output is:
>
> >>> print data
> sh dialer | i Default
> 17002111000              1          0    8w2d           successful   
> Default
> 17002111002              0          0    never                   -   
> Default
> 17002111001              1          0    never                   -   
> Default
> J07MR3640#
>
> The "print data" statement yields:
>
> term len 0
> J07MR3640#
>
> I've run a packet capture and I see the data coming back every time. I 
> don't understand why it works fine for 999 out of 1,000 locations. Any 
> suggestions?
Sorry but I find the above confusing. The best guess I can make is that 
the 5 lines following >>> print data is the packet capture, and the 2 
lines following "yields:" is the subset of the packet capture that comes 
into self.data. Is this true? If so are you asking why 
self.tn.read_until(self.host.upper() + "#", 7) does not get all the packet?


-- 
Bob Gailer
510-978-4454