websocketd now understands JSON messages

src/debuggingws.cr

@@ -35,6 +35,7 @@ class WrappedTCPFileDescriptor < TCPSocket
 end
 
 service_name = "websocket"
+domain = "localhost"
 port_to_listen = 1234
 
 OptionParser.parse! do |parser|
@@ -42,6 +43,10 @@ OptionParser.parse! do |parser|
 		port_to_listen = port.to_u16
 	end
 
+	parser.on "-d domain", "--domain domain", "Domain to listen on (example: localhost)." do |dom|
+		domain = dom
+	end
+
 	parser.on "-s service-name", "--service-name service-name", "Service name." do |name|
 		service_name = name
 	end
@@ -61,6 +66,8 @@ class InstanceStorage
 	property switchtable : Hash(Int32, Int32)
 	property connectionlist : Hash(Int32, IPC::Connection)
 
+	property alreadyconnected : Hash(Int32, Bool)
+
 	def initialize (@service : IPC::SwitchingService)
 		# fdlist_client = [] of TCPSocket
 		@fdlist = Hash(Int32,String).new
@@ -68,6 +75,7 @@ class InstanceStorage
 		@wssocklist = Hash(Int32, WebSocket).new
 		@switchtable = Hash(Int32, Int32).new
 		@connectionlist = Hash(Int32, IPC::Connection).new
+		@alreadyconnected = Hash(Int32, Bool).new
 	end
 
 	def remove_fd (fdclient : Int32)
@@ -102,7 +110,7 @@ class InstanceStorage
 	end
 end
 
-server = TCPServer.new("localhost", port_to_listen)
+server = TCPServer.new(domain, port_to_listen)
 service = IPC::SwitchingService.new service_name
 service << server.fd
 context = InstanceStorage.new service
@@ -154,14 +162,19 @@ def websocket_client_connection(client, context : InstanceStorage)
 	# registering the client into storing structures to avoid being garbage collected
 	context.socklist[client.fd] = client
 	context.wssocklist[client.fd] = wsclient
+
+	context.alreadyconnected[client.fd] = false
 end
 
 
 def closing_client (fdclient : Int, context : InstanceStorage)
 	# puts "closing the client #{fdclient}"
 	context.remove_fd fdclient
+	context.alreadyconnected[fdclient] = false
 end
 
+puts "listening under the service name #{service_name} and url ws://#{domain}:#{port_to_listen}/"
+
 service.loop do |event|
 	case event
 	when IPC::Event::Connection
@@ -203,7 +216,17 @@ service.loop do |event|
 			next
 		end
 
-		print_hexa(String.new(message), "#{CBLUE}Received message hexa#{CRESET}")
+		# TODO: should send json values soon
+		if context.alreadyconnected[activefd]
+			print_hexa(String.new(message), "#{CBLUE}Received message hexa#{CRESET}")
+			wsclient.send String.new(message)
+		else
+			print_hexa(String.new(message), "#{CBLUE}Received message hexa#{CRESET}")
+			context.alreadyconnected[activefd] = true
+			puts "then send OK"
+			wsclient.send "OK"
+		end
+
 
 	when IPC::Event::Switch
 		puts "\033[36mIPC::Event::Switch#{CRESET}: from fd #{event.connection.fd}"

src/pongd.cr

@@ -1,7 +1,22 @@
+require "option_parser"
 require "ipc"
 require "./colors"
 
-IPC::Service.new ("pong") do |event|
+service_name = "pong"
+
+OptionParser.parse! do |parser|
+	parser.on "-s service_name", "--service-name service_name", "URI" do |optsn|
+		service_name = optsn
+	end
+
+	parser.on "-h", "--help", "Show this help" do
+		puts parser
+		exit 0
+	end
+end
+
+
+IPC::Service.new (service_name) do |event|
 	case event
 	when IPC::Event::Connection
 		puts "#{CBLUE}IPC::Event::Connection#{CRESET}, client: #{event.connection.fd}"

src/websocketd.cr

@@ -4,6 +4,8 @@ require "socket"
 require "./colors"
 require "./ws"
 
+require "json"
+
 require "socket"
 require "http"
 require "http/server"
@@ -55,25 +57,27 @@ end
 
 class InstanceStorage
 	property service : IPC::SwitchingService
-	property is_client : Hash(Int32,Bool)
 	property switchtable : Hash(Int32, Int32)
-	property fdtotcpsocket : Hash(Int32, TCPSocket)
+	property is_client : Hash(Int32,Bool)
-	property fdtows : Hash(Int32, WebSocket)
+	property is_json : Hash(Int32, Bool)
-	property fdtoipcconnection : Hash(Int32, IPC::Connection)
+	property fd_to_tcpsocket : Hash(Int32, TCPSocket)
+	property fd_to_websocket : Hash(Int32, WebSocket)
+	property fd_to_ipcconnection : Hash(Int32, IPC::Connection)
 
 	def initialize (@service : IPC::SwitchingService)
 		# fdlist_client = [] of TCPSocket
-		@is_client = Hash(Int32,Bool).new
-		@fdtotcpsocket = Hash(Int32, TCPSocket).new
-		@fdtows = Hash(Int32, WebSocket).new
 		@switchtable = Hash(Int32, Int32).new
-		@fdtoipcconnection = Hash(Int32, IPC::Connection).new
+		@is_client = Hash(Int32,Bool).new
+		@is_json = Hash(Int32,Bool).new
+		@fd_to_tcpsocket = Hash(Int32, TCPSocket).new
+		@fd_to_websocket = Hash(Int32, WebSocket).new
+		@fd_to_ipcconnection = Hash(Int32, IPC::Connection).new
 	end
 
 	def remove_fd (fdclient : Int32)
 		# 1. closing both the client and the service
 		fdservice = @switchtable[fdclient]?
-		tcpfdc = @fdtotcpsocket[fdclient]
+		tcpfdc = @fd_to_tcpsocket[fdclient]
 
 		# 2. closing the TCP connections
 		tcpfdc.close unless tcpfdc.closed?
@@ -88,12 +92,13 @@ class InstanceStorage
 
 		# 6. removing the client and the service from is_client
 		@is_client = @is_client.select do |fd,v| fd != fdclient end
+		@is_json = @is_json.select do |fd,v| fd != fdclient end
 
 		unless fdservice.nil?
-			service = @fdtoipcconnection[fdservice]
+			service = @fd_to_ipcconnection[fdservice]
 			service.close
 			@service.remove_fd (fdservice)
-			@fdtoipcconnection = @fdtoipcconnection.select do |k, v|
+			@fd_to_ipcconnection = @fd_to_ipcconnection.select do |k, v|
 				k != fdservice
 			end
 
@@ -144,14 +149,23 @@ def websocket_client_connection(client, context : InstanceStorage)
 		return
 	end
 
+	# The client may ask to transcript JSON-based messages into IPC messages.
+	# To that end, the client may send the name of the service it wants to reach with the prefix ".JSON".
+
+	if req_service.ends_with? ".JSON"
+		context.is_json[client.fd] = true
+		req_service = req_service.gsub /.JSON$/, ""
+	else
+		context.is_json[client.fd] = false
+	end
+
+
 	websocket_connection_procedure req_service, client.fd, context
 
 	# puts "#{headers_header}\n#{headers.to_s}\r\n"
 	client.send "#{headers_header}\n#{headers.to_s}\r\n"
 
 	wsclient = WebSocket.new client
-
-	# the client is still not connected to a service
 	context.is_client[client.fd] = true
 
 	# listen to the client's file descriptor
@@ -159,8 +173,8 @@ def websocket_client_connection(client, context : InstanceStorage)
 	# puts "#{CBLUE}new client: #{client.fd}#{CRESET}"
 
 	# registering the client into storing structures to avoid being garbage collected
-	context.fdtotcpsocket[client.fd] = client
+	context.fd_to_tcpsocket[client.fd] = client
-	context.fdtows[client.fd] = wsclient
+	context.fd_to_websocket[client.fd] = wsclient
 end
 
 
@@ -178,7 +192,7 @@ def websocket_connection_procedure (requested_service : String, clientfd : Int32
 	begin
 		# 2. establishing a connection to the service
 		newservice = IPC::Connection.new requested_service
-		context.fdtoipcconnection[newservice.fd] = newservice
+		context.fd_to_ipcconnection[newservice.fd] = newservice
 
 		# 3. listening on the client fd and the service fd
 		context.service << newservice.fd
@@ -200,14 +214,31 @@ def websocket_connection_procedure (requested_service : String, clientfd : Int32
 	end
 end
 
+class JSONWSMessage
+	JSON.mapping(
+		mtype: Int32,
+		payload: String
+	)
+
+	def initialize (@mtype : Int32, @payload : String)
+	end
+end
+
+class IPC::Message
+	def to_json
+		JSONWSMessage.new(@type.to_i, String.new(@payload)).to_json
+	end
+end
+
 def websocket_switching_procedure (activefd : Int, context : InstanceStorage)
 	begin
 		if context.is_client[activefd]
 			# The client is a WebSocket on top of a TCP connection
-			client = context.fdtotcpsocket[activefd]
+			client = context.fd_to_tcpsocket[activefd]
-			wsclient = context.fdtows[activefd]
+			wsclient = context.fd_to_websocket[activefd]
 			begin
 				message = wsclient.read
+
 			rescue e
 				puts "#{CRED}Exception (receiving a message)#{CRESET} #{e}"
 				closing_client activefd, context
@@ -226,6 +257,16 @@ def websocket_switching_procedure (activefd : Int, context : InstanceStorage)
 				return
 			end
 
+			# TODO: verify this
+			if context.is_json[activefd]
+				jsonmessage = JSONWSMessage.from_json String.new(message)
+				message = to_message jsonmessage.mtype, jsonmessage.payload
+
+				# puts "JSON TYPE !!!"
+				# pp! jsonmessage
+				# pp! message
+			end
+
 			# puts "switching: client to service"
 			# print_hexa(String.new(message), "#{CBLUE}Received message hexa#{CRESET}")
 			# client => service
@@ -233,7 +274,7 @@ def websocket_switching_procedure (activefd : Int, context : InstanceStorage)
 
 			# XXX: this is not a TCP fd, but since behind the scene this is compatible, I'm hacking a bit
 			serv = WrappedTCPFileDescriptor.new(fd: fdservice, family: Socket::Family::INET)
-			#serv = context.fdtoipcconnection[fdservice]
+			#serv = context.fd_to_ipcconnection[fdservice]
 			serv.send message
 
 		else
@@ -241,13 +282,24 @@ def websocket_switching_procedure (activefd : Int, context : InstanceStorage)
 			# service => client
 
 			fdclient = context.switchtable[activefd]
-			wsclient = context.fdtows[fdclient]
+			wsclient = context.fd_to_websocket[fdclient]
 
-			serv = context.fdtoipcconnection[activefd]
+			serv = context.fd_to_ipcconnection[activefd]
 			message = serv.read
 			# puts "received message from service: #{message.to_s}"
-			buf = message.to_buffer
+
+			if context.is_json[fdclient]
+				buf = message.to_json
+				# puts "JSON TYPE !!!"
+				# pp! buf
+			else
+				buf = message.to_buffer
+			end
+
+			# TODO: REMOVE THIS
+			#    buf = message.to_buffer
 			# print_hexa String.new(buf), "\033[31m Message to send to the client \033[00m "
+
 			wsclient.send buf
 		end
 	rescue e