nginxのデフォルトログ形式のファイルをapacheのデフォルトログ形式に変換する

使い捨てコード

# nginx2apache.rb

def self.log_pattern
  /
    ^
    (\S+)       # ip_address 
    \s+
    (\S+)       # identity_check
    \s+
    (\S+)       # user
    \s+
    \[ (.*?) \] # date
    \s+
    " (.*?) "   # request 
    \s+
    (\S+)       # status
    \s+
    (\S+)       # size
    \s+
    " (.*?) "   # referer
    \s+
    " (.*?) "   # user_agent
    \s+
    " (.*?) "   # forwarded_for
    $
  /x
end

src_f = ARGV[0]
dst_f = ARGV[1]
puts "src: #{src_f}"
puts "dst: #{dst_f}"

open(dst_f, "w") do |dst|
  open(src_f) do |src|
    while line = src.gets
      match = line.match(log_pattern)
      line = line.chomp
      if match.nil?
        line += ' "-"'
      end
      dst.puts line
    end
  end
end

使い方

$ ruby nginx2apache.rb nginx.access.log apache.access.log