Re: [magic sv logging]

[Mike Buland <xagafinelle@gmail.com>]

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You haven't missed anything, well, it's more like "tail --follow=name
<file>' but instead of piping the output of tail into another program for
processing, this just does all the work in python.  Not only was it fun to
write, but I like the fact that I don't need to chain more programs
together.

--Mike

On Fri, Sep 21, 2012 at 9:29 AM, Lorenzo Beretta <lory.fulgi@infinito.it>wrote:

> On 21/09/2012 04:25, Mike Buland wrote:
>
>> I took a different approach and monitored the log output of svlogd, since
>> I
>> wanted the logs anyway.  This is some code that well help you with that,
>> anyway:
>>
>> import os
>> import time
>> import stat
>>
>> fIn = open("current", "r")
>> sid = os.stat("current")[stat.ST_**INO]
>>
>> while True:
>>          try:
>>                  sidNew = os.stat("current")[stat.ST_**INO]
>>                  if sidNew != sid:
>>                          fIn.close()
>>                          fIn = open("current", "r")
>>                          sid = sidNew
>>          except:
>>                  time.sleep( 1 )
>>                  continue
>>
>>          while True:
>>                  l = fIn.readline()
>>                  if l is None or l == '':
>>                          break
>>                  # do something interesting with your line here
>>                  time.sleep( 1 )
>>
>> This will read everything from current, and when current moves, it will
>> read what's left, open the new current, and read all of it.  I use it to
>> monitor apache log output, and it hasn't failed me yet.
>>
>> --Mike
>>
>
> Unless I missed something, it looks as if you're reimplementing the '-F'
> flag in tail :)
>
>
>