check_logdate.rb

#!/usr/bin/env ruby
# coding: utf-8

require 'date'

module DateTimeStringer
  def to_sdate
    strftime("%Y-%m-%d")
  end

  def to_stime
    strftime("%H:%M:%S")
  end
end

class Date
  include DateTimeStringer
end

class DateTime
  include DateTimeStringer
end

class ApacheLog
  attr_accessor :line, :time

  class << self
    def extract_time(line)
      DateTime.parse(line.scan(/\[([^\]]+)\]/).flatten.first.gsub!(/\//,'-').gsub!(/^([^:]+):/,'\1 '))
    end
  end

  def initialize(line)
    @line = line
    @time = ApacheLog.extract_time(@line)
  end

  def to_line
    time_s = @time.strftime("%d/%b/%Y:%H:%M:%S %z")
    @line.sub(/\[[^\]]+\]/, "[#{time_s}]")
  end
end

class LogFile
  attr_accessor :filename, :time, :head, :tail

  def initialize(filename)
    @filename = filename
    get_head!
    get_tail!
    get_date_from_filename!
  end

  def get_date_from_filename!
    @time = Date.parse(@filename.split(".").last.scan(/(\d{4})(\d{2})(\d{2})/).flatten.join("-"))
  end

  def method_missing(name, *args)
    case name.to_s
    when /^get_(head|tail)\!$/
      return instance_variable_set(:"@#{$1}", ApacheLog.new(`#{$1} -1 #{@filename}`))
    end

    super(name, *args)
  end
end

class Kompairer
  attr_accessor :messages

  class << self
    def validate(logs)
      self.new(logs)
    end
  end

  def initialize(logs)
    @logs = logs
    @messages = []
    validate!
  end


  def validate!
    kompair = proc{|a, b| a.time.to_sdate == b.time.to_sdate }

    unless kompair[@logs, @logs.head]
      @messages << "File name date and date of head are unmatched"
    end

    unless kompair[@logs, @logs.tail]
      @messages << "File name date and date of tail are unmatched"
    end

    unless kompair[@logs.head, @logs.tail]
      @messages << "Dates of head and tail are unmatched"
    end
  end

  def ok?
    @messages.empty?
  end
end


if __FILE__ == $0

  fname = ARGV[0]

  logs = LogFile.new(fname)
  kompaired = Kompairer.validate(logs)

  unless kompaired.ok?
    puts "[ERROR] #{fname}\n#{@messages.join("\n")}"
  else
    puts "[OK] #{fname} (s: #{logs.head.time.to_stime}, e: #{logs.tail.time.to_stime})"
  end

end