Class: Protocol::Rack::Adapter::Rack2

Inherits:
Generic
  • Object
show all
Defined in:
lib/protocol/rack/adapter/rack2.rb

Constant Summary collapse

RACK_VERSION = 
'rack.version'
RACK_MULTITHREAD = 
'rack.multithread'
RACK_MULTIPROCESS = 
'rack.multiprocess'
RACK_RUN_ONCE = 
'rack.run_once'
RACK_IS_HIJACK = 
'rack.hijack?'
RACK_HIJACK = 
'rack.hijack'

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Generic

#failure_response, #initialize, #logger, #unwrap_headers, #unwrap_request

Constructor Details

This class inherits a constructor from Protocol::Rack::Adapter::Generic

Class Method Details

.make_response(env, response) ⇒ Object 



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# File 'lib/protocol/rack/adapter/rack2.rb', line 121

def self.make_response(env, response)
	# These interfaces should be largely compatible:
	headers = response.headers.to_h
	
	if protocol = response.protocol
		headers['rack.protocol'] = protocol
		# headers['upgrade'] = protocol
	end
	
	if body = response.body and body.stream?
		if env[RACK_IS_HIJACK]
			headers[RACK_HIJACK] = body
			body = []
		end
	end
	
	headers.transform_values! do |value|
		value.is_a?(Array) ? value.join("\n") : value
	end
	
	[response.status, headers, body]
end

.wrap(app) ⇒ Object 



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# File 'lib/protocol/rack/adapter/rack2.rb', line 23

def self.wrap(app)
	Rewindable.new(self.new(app))
end

Instance Method Details

#call(request) ⇒ Object

Build a rack ‘env` from the incoming request and apply it to the rack middleware.



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# File 'lib/protocol/rack/adapter/rack2.rb', line 79

def call(request)
	env = self.make_environment(request)
	
	status, headers, body = @app.call(env)
	
	headers, meta = self.wrap_headers(headers)
	
	# Rack 2 spec does not allow only partial hijacking.
	# if hijack_body = meta[RACK_HIJACK]
	# 	body = hijack_body
	# end
	
	return Response.wrap(env, status, headers, meta, body, request)
rescue => exception
	Console.logger.error(self) {exception}
	
	body&.close if body.respond_to?(:close)
	
	return failure_response(exception)
end

#make_environment(request) ⇒ Object 



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# File 'lib/protocol/rack/adapter/rack2.rb', line 27

def make_environment(request)
	request_path, query_string = request.path.split('?', 2)
	server_name, server_port = (request.authority || '').split(':', 2)
	
	env = {
		RACK_VERSION => [2, 0],
		RACK_MULTITHREAD => false,
		RACK_MULTIPROCESS => true,
		RACK_RUN_ONCE => false,
		
		PROTOCOL_HTTP_REQUEST => request,
		
		RACK_INPUT => Input.new(request.body),
		RACK_ERRORS => $stderr,
		RACK_LOGGER => self.logger,

		# The request protocol, either from the upgrade header or the HTTP/2 pseudo header of the same name.
		RACK_PROTOCOL => request.protocol,
		
		# The HTTP request method, such as “GET” or “POST”. This cannot ever be an empty string, and so is always required.
		CGI::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.
		CGI::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.
		CGI::PATH_INFO => request_path,
		CGI::REQUEST_PATH => request_path,
		CGI::REQUEST_URI => request.path,

		# The portion of the request URL that follows the ?, if any. May be empty, but is always required!
		CGI::QUERY_STRING => query_string || '',
		
		# The server protocol (e.g. HTTP/1.1):
		CGI::SERVER_PROTOCOL => request.version,
		
		# The request scheme:
		RACK_URL_SCHEME => request.scheme,
		
		# I'm not sure what sane defaults should be here:
		CGI::SERVER_NAME => server_name,
		CGI::SERVER_PORT => server_port,
	}
	
	self.unwrap_request(request, env)
	
	return env
end

#wrap_headers(fields) ⇒ Object

Process the rack response headers into into a HTTP::Headers instance, along with any extra ‘rack.` metadata.



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# File 'lib/protocol/rack/adapter/rack2.rb', line 102

def wrap_headers(fields)
	headers = ::Protocol::HTTP::Headers.new
	meta = {}
	
	fields.each do |key, value|
		key = key.downcase
		
		if key.start_with?('rack.')
			meta[key] = value
		else
			value.split("\n").each do |value|
				headers[key] = value
			end
		end
	end
	
	return headers, meta
end