Class: Falcon::Adapters::Rack

Inherits:
Object
  • Object
show all
Defined in:
lib/falcon/adapters/rack.rb

Instance Method Summary collapse

Constructor Details

#initialize(app, logger = Async.logger) ⇒ Rack

Returns a new instance of Rack.



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# File 'lib/falcon/adapters/rack.rb', line 29

def initialize(app, logger = Async.logger)
  @app = app
  
  @logger = logger
end

Instance Method Details

#call(request) ⇒ Object 



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# File 'lib/falcon/adapters/rack.rb', line 35

def call(request)
  request_path, query_string = request.path.split('?', 2)
  server_name, server_port = (request.authority || '').split(':', 2)
  
  env = {
    'rack.version' => [2, 0, 0],
    
    'rack.input' => Input.new(request.body),
    'rack.errors' => $stderr,
    
    'rack.multithread' => true,
    'rack.multiprocess' => true,
    'rack.run_once' => false,
    
    # The HTTP request method, such as “GET” or “POST”. This cannot ever be an empty string, and so is always required.
    'REQUEST_METHOD' => request.method,
    
    # The initial portion of the request URL's “path” that corresponds to the application object, so that the application knows its virtual “location”. This may be an empty string, if the application corresponds to the “root” of the server.
    'SCRIPT_NAME' => '',
    
    # The remainder of the request URL's “path”, designating the virtual “location” of the request's target within the application. This may be an empty string, if the request URL targets the application root and does not have a trailing slash. This value may be percent-encoded when originating from a URL.
    'PATH_INFO' => request_path,
    
    # The portion of the request URL that follows the ?, if any. May be empty, but is always required!
    'QUERY_STRING' => query_string || '',
    
    # The server protocol, e.g. HTTP/1.1
    'SERVER_PROTOCOL' => request.version,
    'rack.url_scheme' => 'http',
    
    # I'm not sure what sane defaults should be here:
    'SERVER_NAME' => server_name || '',
    'SERVER_PORT' => server_port || '',
  }
  
  if content_type = request.headers.delete('content-type')
    env['CONTENT_TYPE'] = content_type
  end
  
  if content_length = request.headers.delete('content-length')
    env['CONTENT_LENGTH'] = content_length
  end
  
  request.headers.each do |key, value|
    env["HTTP_#{key.upcase.tr('-', '_')}"] = value
  end
  
  if remote_address = request.remote_address
    env['REMOTE_ADDR'] = remote_address.ip_address if remote_address.ip?
  end
  
  if request.hijack?
    env['rack.hijack?'] = true
    
    env['rack.hijack'] = lambda do
      wrapper = request.hijack
      
      # We dup this as it might be taken out of the normal control flow, and the io will be closed shortly after returning from this method.
      io = wrapper.io.dup
      wrapper.close
      
      env['rack.hijack_io'] = io
    end
  else
    env['rack.hijack?'] = false
  end
  
  status, headers, body = @app.call(env)
  
  # if hijack = headers.delete('rack.hijack')
  #  body = Async::HTTP::Body::Writable.new
  # 
  #  Task.current.async do
  #    hijack.call(body)
  #  end
  #  return nil
  # end
  
  # if env['rack.hijack_io']
  #  return nil
  # end
  
  @logger.debug(request) {"Rack response: #{status} #{headers.inspect} #{body.class}"}
  return Response.new(status, headers, body)
rescue => exception
  @logger.error "#{exception.class}: #{exception.message}\n\t#{$!.backtrace.join("\n\t")}"
  
  return failure_response(exception)
end

#failure_response(exception) ⇒ Object 



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# File 'lib/falcon/adapters/rack.rb', line 125

def failure_response(exception)
  Async::HTTP::Response.for_exception(exception)
end