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Sinatra based framework and DSL for building rock-solid REST applications (like API's)

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Sinatra::Rabbit
=============

Sinatra::Rabbit is a [Sinatra](http://www.sinatrarb.com) extensions that
makes designing a [REST API](http://en.wikipedia.org/wiki/Representational_State_Transfer)
much easier and more fun.

Rabbit maps REST resources to 'collections'. Every collection then could define
CRUD and other operations to manipulate with resource. Rabbit will handle
parameter validation and capability checks for you, so you can focus on the
structure and design of your REST API.

Once your REST API is designed, Rabbit will make it available as modular Sinatra
application thus mountable to any Rack compatible container (Rails, Padrino...)

Original Rabbit idea has been taken from the [Deltacloud API](http://deltacloud.org)
project. However this is an complete rewrite of the original Deltacloud Rabbit.
The goal is to make Rabbit highly modular, so it can be used in other projects
as well as in Deltacloud.

Full documentation: [rubydoc.info/github/mifo/sinatra-rabbit](http://rubydoc.info/github/mifo/sinatra-rabbit/master)

An example application (modular Deltacloud API) can be found here:
[github.com/mifo/deltacloud-modular](https://github.com/mifo/deltacloud-modular)

Features
-------

* Automatically generate proper path and use the right HTTP method for all CRUD operations:
  * `operation :create` is being mapped as 'POST /:collection'
  * `operation :index` is being mapped as 'GET /:collection'
  * `operation :show` is being mapped as 'GET /:collection/:id'
  * `operation :update` is being mapped as 'PATCH /:collection/:id'
  * `operation :destroy` is being mapped as 'DELETE /:collection/:id'
  * `action :reboot` is being mapped as 'POST /:collection/:id/reboot'
* Automatically set the :id parameter for routes like :show or :destroy
* Automatically validates the request parameter values
* Allow to change the HTTP method (`action :reboot, :http_method => :post`)
* Allow to check if operation is supported by the current resource
<pre>
  <code>
    check_capability :for => lambda { |m| driver.respond_to? m }

collection :vms do
      action :stop, :with_capability => :stop do
        control do
          # ...
        end
      end
    end
  </code>
</pre>
* Allow to define groups of parameters as features and make them available if
  the current resource support them
* Support the 'sub-collections' that might be defined on resouce
<pre>
  <code>
    collection :buckets do
      collection :blobs, :with_id => :bucket_id do

# GET /buckets/:bucket_id/blobs/:id
        operation :show do
          control { #... }
        end
      end

# GET /buckets/:id
      operation :show do
        control { #... }
      end
    end
  </code>
</pre>
* Generate HEAD routes for all operations and collections to check if the route
  is available
* Generate OPTIONS routes for all operations and collections
  * `OPTIONS /:collection` will return list of all operations (using 'Allow' header)
  * `OPTIONS /:collection/:operation` will return list of parameters defined for given operation (using 'Allow' header)
* Allow to manipulate with the REST structure programmatically, to generate
  documentation or collect statistics
* Include bunch of tests to prove it all works correctly

Configuration
-------

Rabbit behavior can be customized using `configure` method:

Sinatra::Rabbit.configure do
      disable :head_routes      # This will disable automatic generation of HEAD routes
      disable :options_routes   # This will disable automatic generation of OPTIONS routes
      disable :documentation    # This will disable automatic generation of documentation routes
    end

Operation specific 'features'
--------

In some specific use-cases, you would like to have different set of parameters
for operation, based on some condition of your system.
To give you and example, in Deltacloud API project, we have support for
different drivers. The project aims to give user full cross-cloud abstraction
layer, however for some cloud providers the full abstraction is not possible and
in this case we need to handle this using 'features'. It mean that some
particular operations can have 'feature' assigned. If this 'feature' is
supported by underlaying driver, then we add new parameters to that operations.

In sinatra-rabbit, you can define features for every model in this way:

class Sample < Sinatra::Base
      include Sinatra::Rabbit
      include Sinatra::Rabbit::Features

features do
        feature :user_name, :for => :instances do
          operation :create do
            param :user_name, :string, :optional, "Allow to define user-defined name"
          end
        end
      end
    end

You can also wrap features into 'if' block or put some conditions on top
of this block to make it more flexible.

Tests
------

Project include set of minitest files located under 'tests/' directory. You can
launch them by typing:

$ rake test:all

If you want to run just DSL tests:

$ rake test:dsl

If you want to test if Sinatra::Base works on your system correctly with Rabbit:

$ rake test:app

If you want to see code coverage, you must install the *simplecov* gem:

$ gem install simplecov
    $ rake coverage

NOTE: The coverage reports are supported only on Ruby 1.9

TODO
-------

* Add documentation generation and routes for Rabbit based applications

Installation
-------

* `gem install sinatra-rabbit`

Usage
-------

require 'sinatra/base'
    require 'sinatra/rabbit'

class MySinatraApp < Sinatra::Base
      include Sinatra::Rabbit

collection :images do
        description "Images description"

collection :subcollection do
          description "Images subcollection"

operation :index do
            description "Hello world"
            control do
              status 200
            end
          end
        end

operation :index, :if => lambda { 1 == 1} do
          description "Index operation description"
          control do
            status 200
            "Hello from index operation"
          end
        end

operation :show do
          description "Index operation description"
          param :id,  :string, :required
          param :r1,  :string, :optional, "Optional parameter"
          param :v1,  :string, :optional, [ 'test1', 'test2', 'test3' ], "Optional parameter"
          param :v2,  :string, :optional, "Optional parameter"
          control do
            "Hey #{params[:id]}"
          end
        end
      end
    end

MySinatraApp.run!

License
---------

Apache License
                           Version 2.0, January 2004
                        http://www.apache.org/licenses/

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