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Forked from rkh/rack_example.ru
Created June 17, 2012 18:12
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Very basic rack application showing how to use a router based on the uri and how to process requests based on the HTTP method used.
#########################################
# Very basic rack application showing how to use a router based on the uri
# and how to process requests based on the HTTP method used.
#
# Usage:
# $ rackup rack_example.ru
#
# $ curl -X POST -d 'title=retire&body=I should retire in a nice island' localhost:9292/ideas
# $ curl -X POST -d 'title=ask Satish for a gift&body=Find a way to get Satish to send me a gift' localhost:9292/ideas
# $ curl localhost:9292/ideas
#
#########################################
class Idea
attr_accessor :title, :body, :created_at
# Memory store, gets cleared as the process is restarted
def self.store
@ideas ||= []
end
class InvalidParams < StandardError; end
# create an instance based on some passed params
def initialize(params)
raise InvalidParams, "You need to provide at least a title" unless params['title']
self.title = params['title']
self.body = params['body']
self.created_at = Time.now
end
# Converts an instance into a string
def to_s
"#{title} at #{created_at.to_s}\n#{body}"
end
end
class IdeaAPI
def call(env)
case env['REQUEST_METHOD']
when 'POST'
Idea.store << Idea.new(request.params)
return [200, {"Content-Type" => "text/plain"}, ["Idea added, currently #{Idea.store.size} ideas are in memory!"]]
when 'GET'
return [200, {"Content-Type" => "text/plain"}, [Idea.store.map{|idea, idx| idea.to_s }.join("\n\n") + "\n"]]
end if env['PATH_INFO'] == '/ideas'
[404, {}, ["Did you get lost?"]]
rescue Idea::InvalidParams => error
[400, {"Content-Type" => "text/plain"}, [error.message]]
end
end
run IdeaAPI.new
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