From: Derek Smith <derekbellnersmith@...>
Date: 2009-05-06T09:23:15+09:00
Subject: Re: my logroll code, please critique

Joel VanderWerf wrote:
> Derek Smith wrote:
>> Will anyone share good sample code for logging?
> 
> There's the logger.rb in the ruby standard library (or did someone
> mention that already?). It handles rotation, log levels, but perhaps not
> multiprocess safety.

Here is my updated code, but how do I look at the documentation from the 
CLI for logger, logging or any gem?  For example, if I want to look at 
Perl docs I use perldoc -f "builtin function" or perldoc -q "F.A.Q."
Finally, what about a central logging block for when at anytime 'raise 
StandardError' is called, the script will log to one logfile.  Will 
anyone suggest code or how to do this?


thank you!


#!/usr/bin/ruby -w -W 2

require 'ftools'
require 'fileutils'

=begin
#-----------------------------
File::LOCK_SH     # shared lock (for reading)
File::LOCK_EX     # exclusive lock (for writing)
File::LOCK_NB     # non-blocking request
File::LOCK_UN     # free lock
#-----------------------------
=end


###-- 10 files at 100Mb before rolling begins ---##

FSIZE = 104860000

Dir.chdir("/cygdrive/c/temp/log") \
    or raise StandardError, "Change dir failed to ~aevrlog!"

unless File.exists?("/cygdrive/c/temp/log/zipped")
    File.makedirs("zipped") \
    or raise StandardError, "Make dir failed to ~aevrlog/zipped!"
end

array1 = Dir.glob("dev*.log")
array2 = Dir.glob("mon*.log")
array3 = Dir.glob("fer*_se*.out")
array4 = Dir.glob("fer*_se*.log")
array5 = Dir.glob("fer*_in*.log")

if (array1.length >= 1)
    array1.each { |file|

    if (File.size(file) > FSIZE)
        File.open(file, "r+") do |f|
            if (f.flock(File::LOCK_SH)) == 0
                `/usr/bin/gzip "#{file}"`
                 FileUtils.mv("#{file}.gz","/cygdrive/c/temp/log/zipped")
            end
        end
        FileUtils.touch("development.log")
    end
    }
end

Dir.chdir("/cygdrive/c/temp/log/zipped") \
    or raise StandardError, "Change dir failed to ~aevrlog!"

array1_1 = Dir["/cygdrive/c/temp/log/zipped/dev*.gz"]

    if (array1_1.length >= 1)
        if File.exists?("development.log.11.gz")
            FileUtils.rm_r 
Dir.glob("/cygdrive/c/temp/log/zipped/dev*11.gz")
        end
        if File.exists?("development.log.10.gz")
            File.rename("development.log.10.gz", 
"development.log.11.gz")
        end
        if File.exists?("development.log.9.gz")
            File.rename("development.log.9.gz", "development.log.10.gz")
        end
        if File.exists?("development.log.8.gz")
            File.rename("development.log.8.gz", "development.log.9.gz")
        end
        if File.exists?("development.log.7.gz")
            File.rename("development.log.7.gz", "development.log.8.gz")
        end
        if File.exists?("development.log.6.gz")
            File.rename("development.log.6.gz", "development.log.7.gz")
        end
        if File.exists?("development.log.5.gz")
            File.rename("development.log.5.gz", "development.log.6.gz")
        end
        if File.exists?("development.log.4.gz")
            File.rename("development.log.4.gz", "development.log.5.gz")
        end
        if File.exists?("development.log.3.gz")
            File.rename("development.log.3.gz", "development.log.4.gz")
        end
        if File.exists?("development.log.2.gz")
            File.rename("development.log.2.gz", "development.log.3.gz")
        end
        if File.exists?("development.log.1.gz")
            File.rename("development.log.1.gz", "development.log.2.gz")
        end
        if File.exists?("development.log.gz")
            File.rename("development.log.gz", "development.log.1.gz")
        end
    end

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