Class: Moonrope::RackMiddleware

Inherits:
Object
  • Object
show all
Defined in:
lib/moonrope/rack_middleware.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(app, base, options = {}) ⇒ RackMiddleware

Initialize a new Moonrope::Rack server

Parameters:

  • app (Object) —

    the next Rack application in the stack

  • base (Moonrope::Base) —

    the base API to serve

  • options (Hash) (defaults to: {}) —

    a hash of options



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# File 'lib/moonrope/rack_middleware.rb', line 12

def initialize(app, base, options = {})
  @app = app
  @base = base
  @options = options
end

Instance Attribute Details

#base ⇒ Object (readonly)

Returns the value of attribute base.



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# File 'lib/moonrope/rack_middleware.rb', line 18

def base
  @base
end

Instance Method Details

#call(env) ⇒ Array

Make a new request

Parameters:

  • env (Hash) —

    a rack environment hash

Returns:

  • (Array) —

    a rack triplet



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# File 'lib/moonrope/rack_middleware.rb', line 26

def call(env)
  if env['PATH_INFO'] =~ Moonrope::Request.path_regex

    if @options[:reload_on_each_request]
      @base.load
    end

    #
    # Call the on request block if one has been defined for the base.
    #
    if @base.on_request.is_a?(Proc)
      @base.on_request.call(@base, env)
    end

    #
    # Create a new request object
    #
    request = @base.request(env, $1)

    #
    # Set some global headers which are always returned
    #
    global_headers = {}
    global_headers['Content-Type'] = 'text/plain'
    global_headers['Access-Control-Allow-Origin'] = '*'
    if env['HTTP_ACCESS_CONTROL_REQUEST_HEADERS']
      global_headers['Access-Control-Allow-Headers'] = env['HTTP_ACCESS_CONTROL_REQUEST_HEADERS']
    end
    global_headers['Access-Control-Allow-Methods'] = '*'

    #
    # Options always returns a 200
    #
    if env['REQUEST_METHOD'] == 'OPTIONS'
      return [200, global_headers, ['OK']]
    end

    #
    # Responses are now in JSON
    #
    global_headers['Content-Type'] = 'application/json'

    #
    # Check the request is valid
    #
    unless request.valid?
      return [400, global_headers, [{:status => 'invalid-controller-or-action'}.to_json]]
    end

    #
    # Execute the request
    #
    begin
      result = request.execute
      json = result.to_json
      global_headers['Content-Length'] = json.bytesize.to_s
      [200, global_headers.merge(result.headers), [result.to_json]]
    rescue JSON::ParserError => e
      [400, global_headers, [{:status => 'invalid-json', :details => e.message}.to_json]]
    rescue => e
      Moonrope.logger.info e.class
      Moonrope.logger.info e.message
      Moonrope.logger.info e.backtrace.join("\n")

      response = {:status => 'internal-server-error'}

      # Call any request errors which have been registered on the base
      @base.request_error_callbacks.each do |callback|
        callback.call(request, e)
      end

      # If in development, return more details about the exception which was raised.
      if @base.environment == 'development'
        response[:error] = e.class.to_s
        response[:message] = e.message
        response[:backtrace] = e.backtrace[0,6]
      end

      [500, global_headers, [response.to_json]]
    end

  else
    if @app && @app.respond_to?(:call)
      @app.call(env)
    else
      [404, {}, ["Non-API request"]]
    end
  end
end