DumbStore

README.markdown

DumbStore

A rather dumb storage solution. By default all data will be stored in "database.dumb" in the current directory.

Usage

Usage: dumbstore.rb [options] set/get/delete/keys <key> <value>
    -d, --database PATH              Path to database
    -h, --help                       Display this screen

e.g.

Setting, getting and deleting a value

$ dumbstore.rb set answer 42
$ dumbstore.rb get answer # 42
$ dumbstore.rb delete answer
$ dumbstore.rb get answer # error code

Getting keys

$ dumbstore.rb set key1 1
$ dumbstore.rb set key2 2
$ dumbstore.rb keys key* # key1 key2

dumbstore.rb

#!/usr/bin/env ruby
require 'optparse'

OPTS = {}

def error_out(msg)
  puts msg; exit false
end

def entry(args)
  error_out($optusage) if args.length < 2
  cmd, key = args
  dbp = OPTS[:path] || "#{Dir.getwd}/database.dumb"
  
  if !File.directory?(dbp)
    Dir.mkdir(dbp) rescue error_out("Could not load database #{dbp}")
  end
  
  case cmd.downcase.to_sym
  when :set
    error_out("Please specify a value") if args.length < 3
    File.open("#{dbp}/#{key}", 'w'){|f| f.write args[2]} rescue error_out("Couldn't set #{key}")
  when :get
    print File.open("#{dbp}/#{key}").read rescue exit false
  when :keys
    puts Dir["#{dbp}/#{key}"].map{|f|File.basename(f)}.join(' ')
  when :delete
    FileUtils.rm("#{dbp}/#{key}") rescue error_out("Couldn't delete #{key}")
  else
    error_out("Unknown command #{cmd}")
  end
  
  exit true
end

OptionParser.new do |u|
  u.banner = "Usage: dumbstore.rb [options] set/get/delete/keys <key> <value>"
  u.on( '-d', '--database PATH', 'Path to database' ) { |path| OPTS[:path] = path }
  u.on( '-h', '--help', 'Display this screen' ) { puts u; exit }
  $optusage=u
end.parse!

entry(ARGV)

Seems like this would be very IO intensive for such a simple task.