From: Derek Smith <derekbellnersmith@...>
Date: 2009-10-27T03:56:57+09:00
Subject: Re: file open failure test

> 
> http://blog.rubybestpractices.com/posts/rklemme/001-Using_blocks_for_Robustness.html
> 
> Kind regards
> 
> robert

OK so in relation, I want to have a method for whose responsibility
is logging runtime errors such as failures to open or run OS commands.
However, when I intentionally made it fail, like putting in a non OS 
command
it does not log?  Any help on this or best practices?

thx!

For example:

#!/usr/bin/env ruby -w
require 'date'
require 'ftools'
require 'fileutils'

ENV['PATH'] = 
'/usr/bin:/usr/sbin:/sbin:/bin:/usr/local/bin:/usr/local/vrep'
VERSIONS    = 14.to_i
DB_DIR      = "/usr/local/vrep/prod/db"
DB_BKUP1    = Dir.glob("#{DB_DIR}/*.gz")
DB_BKUP     = "#{DB_DIR}/prod_db_bkup_"
RUNLOG      = "/var/log/prod_db_bkup.log"
DBF         = Dir.glob("#{DB_DIR}/*.sqlite3")

unless File.exists?( "#{RUNLOG}" )
    FileUtils.touch( "#{RUNLOG}" ) \
    || warn("Touch file failed for /var/log/prod_db_bkup.log!")
end

d = Date.today
t = Time.now
h = Hash.new
    h["Sun"] = 0
    h["Mon"] = 1
    h["Tue"] = 2
    h["Wed"] = 3
    h["Thr"] = 4
    h["Fri"] = 5
    h["Sat"] = 6

def log_mtd(arg)
    File.open( "#{RUNLOG}", "a" ) do |file|
        file.puts(arg)
    end
end


def db_bkup(arg)
    Dir.chdir( "#{DB_DIR}" ) \
    || die_mtd("Change_Dir_Failed_To_#{DB_DIR}_Dump_Will_Fail!")
    if DBF.length.to_i < 1
        die_mtd("#{DBF}_File_Is_Missing_Dump_Will_Not_Run.+(d.to_s).+(t.hour.to_s)")
    else
        %x(echo ".dump"|sqlite3 development.sqlite3 |gzip -c > 
"#{DB_BKUP.+(arg)}") \
        || die_mtd("SQL_Dump_Cmd_Failed.+(d.to_s).+(t.hour.to_s)")
    end
end

if DB_BKUP1.length.to_i >= 1
    File.open( "#{RUNLOG}", "a" ) do |file|
        h.each_pair do |key, value|
            if d.wday == value
                file.puts '+'
                65.times do file.print "=" end
                file.puts "\n","Beginning day: #{key} DB backup at 
#{d.to_s} #{t.hour}:#{
t.min}","\n"
                file.puts "Executing command echo .dump|sqlite3 
development.sqlite3 |gzip
 -c","\n"
                65.times do file.print "=" end
                file.puts "\n",'+'
                db_bkup(key .+(d.to_s) .+(t.hour.to_s) .+(t.min.to_s))
            end
        end
    end || 
die_mtd("#{RUNLOG}_Did_Not_Open_.+(d.to_s).+(t.hour.to_s).+(t.min.to_s)")
end
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