Class: Async::HTTP::Protocol::HTTP1::Server

Inherits:
Connection
  • Object
show all
Defined in:
lib/async/http/protocol/http1/server.rb

Instance Attribute Summary

Attributes inherited from Connection

#count, #version

Instance Method Summary collapse

Methods inherited from Connection

#concurrency, #http1?, #http2?, #initialize, #peer, #read_line, #read_line?, #reusable?, #viable?

Constructor Details

This class inherits a constructor from Async::HTTP::Protocol::HTTP1::Connection

Instance Method Details

#each(task: Task.current) ⇒ Object

Server loop.



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# File 'lib/async/http/protocol/http1/server.rb', line 46

def each(task: Task.current)
	task.annotate("Reading #{self.version} requests for #{self.class}.")
	
	while request = next_request
		response = yield(request, self)
		body = response&.body
		
		if @stream.nil? and body.nil?
			# Full hijack.
			return
		end
		
		task.defer_stop do
			# If a response was generated, send it:
			if response
				trailer = response.headers.trailer!

				write_response(@version, response.status, response.headers)

				# Some operations in this method are long running, that is, it's expected that `body.call(stream)` could literally run indefinitely. In order to facilitate garbage collection, we want to nullify as many local variables before calling the streaming body. This ensures that the garbage collection can clean up as much state as possible during the long running operation, so we don't retain objects that are no longer needed.

				if body and protocol = response.protocol
					stream = write_upgrade_body(protocol)
					
					# At this point, the request body is hijacked, so we don't want to call #finish below.
					request = response = nil
					
					body.call(stream)
				elsif request.connect? and response.success?
					stream = write_tunnel_body(request.version)
					
					# Same as above:
					request = response = nil
					
					body.call(stream)
				else
					head = request.head?
					version = request.version
					
					# Same as above:
					request = nil unless request.body
					response = nil
					
					write_body(version, body, head, trailer)
				end

				# We are done with the body, you shouldn't need to call close on it:
				body = nil
			else
				# If the request failed to generate a response, it was an internal server error:
				write_response(@version, 500, {})
				write_body(request.version, nil)
			end
			
			# Gracefully finish reading the request body if it was not already done so.
			request&.each{}
			
			# This ensures we yield at least once every iteration of the loop and allow other fibers to execute.
			task.yield
		rescue => error
			raise
		ensure
			body&.close(error)
		end
	end
end

#fail_request(status) ⇒ Object 



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# File 'lib/async/http/protocol/http1/server.rb', line 15

def fail_request(status)
	@persistent = false
	write_response(@version, status, {}, nil)
	write_body(@version, nil)
rescue Errno::ECONNRESET, Errno::EPIPE
	# Handle when connection is already closed
end

#next_request ⇒ Object 



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# File 'lib/async/http/protocol/http1/server.rb', line 23

def next_request
	# The default is true.
	return unless @persistent
	
	# Read an incoming request:
	return unless request = Request.read(self)
	
	unless persistent?(request.version, request.method, request.headers)
		@persistent = false
	end
	
	return request
rescue Async::TimeoutError
	# For an interesting discussion about this behaviour, see https://trac.nginx.org/nginx/ticket/1005
	# If you enable this, you will see some spec failures...
	# fail_request(408)
	raise
rescue
	fail_request(400)
	raise
end