README.md

README

This is a key-value store that uses Sinatra. It provides the basic operations GET, SET, DELETE and KEYS.

You can start the application by executing the file app.rb:

ruby app.rb

Make sure that you have installed the gems sinatra and json.

Usage

Now, let's get our hands dirty. By using PUT and the URI http://localhost:4567/key -d "value" we can set a key-value pair. E.g. we can set the key ruby and the value Is awesome:

curl -X PUT http://localhost:4567/ruby -d "Is awesome"

In order to get a key's value, we can use GET and the URI http://localhost:4567/key. E.g. we can get the value of ruby:

curl http://localhost:4567/ruby

If we want to list all keys currently set we can use GET and the URI http://localhost:4567/\_/keys:

curl http://localhost:4567/_/keys

Last but not least: you can delete a key by using DELETE and the URI http://localhost:4567/key. E.g. we can delete the key ruby:

curl -X DELETE http://localhost:4567/ruby

Future Plans

• Namespaced key-value pairs

app.rb

require "sinatra"
require "json"

Dir.mkdir("data") unless File.directory?("data")

get "/:key" do |key|
  if File.exists?("data/#{key}")
    send_file("data/#{key}")
  else
    [404, "Key #{key} does not exist."]
  end
end

get "/_/keys" do
  keys = Dir.entries("data") - [".", ".."]
  keys.to_json
end

put "/:key" do |key|
  data = request.body.read
  File.open("data/#{key}", "w") do |f|
    f.write(data)
  end
  "OK."
end

delete "/:key" do |key|
  if File.exists?("data/#{key}")
    File.delete("data/#{key}")
    "OK."
  else
    [404, "Key #{key} does not exist."]
  end
end