From: Matthew Smillie <M.B.Smillie@...>
Date: 2006-06-08T07:26:48+09:00
Subject: Re: output delay


On Jun 7, 2006, at 22:06, Daniel Shackelford wrote:

> Howdy,
>
> I am doing some log processing (cross referencing multiple logs,  
> and activating triggers based on the results) and printing the  
> results to stdout for testing while writing to a file at the same  
> time.  The symptom that I am seeing is that the output to stdout is  
> immediate, while tailing the file with the same output seems to be  
> one entry behind.  Here is what the code looks like:

This is the result of buffered output, one simple change ought to fix  
it up:


>
>                    logRoot = '/var/log/'
>                    blockLog = File.open(logRoot + 'block.log', "a+")
>                    result = searchFW(src,dst,path,time)   # does a  
> search for the needed info in the log, and returns the matching lines
>                    unless result.empty?
>                        token = parseFW(result)                  #   
> runs the results through a parser that pulls out the relevant bits
>                        blockLog << date+"+"+token+"+"+url+"\n"
                          blockLog.flush
>                        p date+"+"+token+"+"+url
>                    end