Class: Falcon::Adapters::Rack
- Inherits:
-
Object
- Object
- Falcon::Adapters::Rack
- Defined in:
- lib/falcon/adapters/rack.rb
Constant Summary collapse
- HTTP_X_FORWARDED_PROTO =
'HTTP_X_FORWARDED_PROTO'.freeze
- REMOTE_ADDR =
'REMOTE_ADDR'.freeze
- CONTENT_TYPE =
'CONTENT_TYPE'.freeze
- CONTENT_LENGTH =
'CONTENT_LENGTH'.freeze
Instance Method Summary collapse
- #call(request) ⇒ Object
- #failure_response(exception) ⇒ Object
-
#initialize(app, logger = Async.logger) ⇒ Rack
constructor
A new instance of Rack.
- #make_response(request, status, headers, body) ⇒ Object
-
#unwrap_headers(headers, env) ⇒ Object
Rack separates multiple headers with the same key, into a single field with multiple “lines”.
-
#unwrap_request(request, env) ⇒ Object
Process the incoming request into a valid rack env.
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 37 def initialize(app, logger = Async.logger) @app = app raise ArgumentError, "App must be callable!" unless @app.respond_to?(:call) @logger = logger end |
Instance Method Details
#call(request) ⇒ Object
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# File 'lib/falcon/adapters/rack.rb', line 91 def call(request) request_path, query_string = request.path.split('?', 2) server_name, server_port = (request. || '').split(':', 2) env = { ::Rack::RACK_VERSION => [2, 0, 0], ::Rack::RACK_INPUT => Input.new(request.body), ::Rack::RACK_ERRORS => $stderr, ::Rack::RACK_MULTITHREAD => true, ::Rack::RACK_MULTIPROCESS => true, ::Rack::RACK_RUNONCE => false, # The HTTP request method, such as “GET” or “POST”. This cannot ever be an empty string, and so is always required. ::Rack::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. ::Rack::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. ::Rack::PATH_INFO => request_path, # The portion of the request URL that follows the ?, if any. May be empty, but is always required! ::Rack::QUERY_STRING => query_string || '', # The server protocol (e.g. HTTP/1.1): ::Rack::SERVER_PROTOCOL => request.version, # The request scheme: ::Rack::RACK_URL_SCHEME => request.scheme, # I'm not sure what sane defaults should be here: ::Rack::SERVER_NAME => server_name || '', ::Rack::SERVER_PORT => server_port || '', } self.unwrap_request(request, env) if request.hijack? env[::Rack::RACK_IS_HIJACK] = true env[::Rack::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 # This is implicitly returned: env[::Rack::RACK_HIJACK_IO] = io end else env[::Rack::RACK_IS_HIJACK] = false end status, headers, body = @app.call(env) # Partial hijack is not supported/tested. # 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 return make_response(request, status, headers, body) rescue => exception @logger.error "#{exception.class}: #{exception.}\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 170 def failure_response(exception) Async::HTTP::Response.for_exception(exception) end |
#make_response(request, status, headers, body) ⇒ Object
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# File 'lib/falcon/adapters/rack.rb', line 85 def make_response(request, status, headers, body) # @logger.debug(request) {"Rack response: #{status} #{headers.inspect} #{body.class}"} return Response.wrap(status, headers, body) end |
#unwrap_headers(headers, env) ⇒ Object
Rack separates multiple headers with the same key, into a single field with multiple “lines”.
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# File 'lib/falcon/adapters/rack.rb', line 46 def unwrap_headers(headers, env) headers.each do |key, value| http_key = "HTTP_#{key.upcase.tr('-', '_')}" if current_value = env[http_key] env[http_key] = "#{current_value}\n#{value}" else env[http_key] = value end end end |
#unwrap_request(request, env) ⇒ Object
Process the incoming request into a valid rack env.
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# File 'lib/falcon/adapters/rack.rb', line 59 def unwrap_request(request, env) if content_type = request.headers.delete('content-type') env[CONTENT_TYPE] = content_type end # In some situations we don't know the content length, e.g. when using chunked encoding, or when decompressing the body. if body = request.body and length = body.length env[CONTENT_LENGTH] = length.to_s end self.unwrap_headers(request.headers, env) # HTTP/2 prefers `:authority` over `host`, so we do this for backwards compatibility. env[::Rack::HTTP_HOST] ||= request. # This is the HTTP/1 header for the scheme of the request and is used by Rack. # Technically it should use the Forwarded header but this is not common yet. # https://tools.ietf.org/html/rfc7239#section-5.4 # https://github.com/rack/rack/issues/1310 env[HTTP_X_FORWARDED_PROTO] ||= request.scheme if remote_address = request.remote_address env[REMOTE_ADDR] = remote_address.ip_address if remote_address.ip? end end |