websocketd: simpler protocol
Philippe PITTOLI
parent
608a467f89
commit
48201acea4
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@ -55,25 +55,25 @@ end
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class InstanceStorage
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property service : IPC::SwitchingService
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property fdlist : Hash(Int32,String)
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property socklist : Hash(Int32, TCPSocket)
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property wssocklist : Hash(Int32, WebSocket)
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property is_client : Hash(Int32,Bool)
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property switchtable : Hash(Int32, Int32)
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property connectionlist : Hash(Int32, IPC::Connection)
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property fdtotcpsocket : Hash(Int32, TCPSocket)
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property fdtows : Hash(Int32, WebSocket)
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property fdtoipcconnection : Hash(Int32, IPC::Connection)
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def initialize (@service : IPC::SwitchingService)
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# fdlist_client = [] of TCPSocket
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@fdlist = Hash(Int32,String).new
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@socklist = Hash(Int32, TCPSocket).new
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@wssocklist = Hash(Int32, WebSocket).new
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@is_client = Hash(Int32,Bool).new
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@fdtotcpsocket = Hash(Int32, TCPSocket).new
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@fdtows = Hash(Int32, WebSocket).new
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@switchtable = Hash(Int32, Int32).new
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@connectionlist = Hash(Int32, IPC::Connection).new
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@fdtoipcconnection = Hash(Int32, IPC::Connection).new
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end
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def remove_fd (fdclient : Int32)
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# 1. closing both the client and the service
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fdservice = @switchtable[fdclient]?
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tcpfdc = @socklist[fdclient]
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tcpfdc = @fdtotcpsocket[fdclient]
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# 2. closing the TCP connections
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tcpfdc.close unless tcpfdc.closed?
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@ -86,18 +86,18 @@ class InstanceStorage
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fdc != fdclient && fds != fdclient
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end
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# 6. removing the client and the service from fdlist
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@fdlist = @fdlist.select do |fd,v| fd != fdclient end
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# 6. removing the client and the service from is_client
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@is_client = @is_client.select do |fd,v| fd != fdclient end
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unless fdservice.nil?
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service = @connectionlist[fdservice]
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service = @fdtoipcconnection[fdservice]
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service.close
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@service.remove_fd (fdservice)
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@connectionlist = @connectionlist.select do |k, v|
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@fdtoipcconnection = @fdtoipcconnection.select do |k, v|
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k != fdservice
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end
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@fdlist = @fdlist.select do |fd,v| fd != fdservice end
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@is_client = @is_client.select do |fd,v| fd != fdservice end
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end
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end
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end
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@ -122,9 +122,7 @@ def websocket_client_connection(client, context : InstanceStorage)
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end
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# FIXME: check they actually wanted to upgrade to websocket
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key = request.headers["Sec-WebSocket-Key"]
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response_key = Digest::SHA1.base64digest key + "258EAFA5-E914-47DA-95CA-C5AB0DC85B11"
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# puts response_key
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@ -138,50 +136,55 @@ def websocket_client_connection(client, context : InstanceStorage)
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headers = headers.map { |key, value| "#{key}: #{value[0]}\r\n" }.join
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# requested service, fd
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req_service = request.path.lchop
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if req_service.empty?
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client.close
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puts "should send a PATH"
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return
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end
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websocket_connection_procedure req_service, client.fd, context
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# puts "#{headers_header}\n#{headers.to_s}\r\n"
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client.send "#{headers_header}\n#{headers.to_s}\r\n"
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wsclient = WebSocket.new client
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wsclient.send "are we websocket yet?"
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# the client is still not connected to a service
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context.fdlist[client.fd] = "not connected"
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context.is_client[client.fd] = true
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# listen to the client's file descriptor
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context.service << client.fd
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# puts "#{CBLUE}new client: #{client.fd}#{CRESET}"
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# registering the client into storing structures to avoid being garbage collected
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context.socklist[client.fd] = client
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context.wssocklist[client.fd] = wsclient
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context.fdtotcpsocket[client.fd] = client
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context.fdtows[client.fd] = wsclient
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end
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def closing_client (fdclient : Int, context : InstanceStorage)
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# puts "closing the client #{fdclient}"
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puts "#{CBLUE}closing the client:#{CRESET} #{fdclient}"
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context.remove_fd fdclient
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end
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# first message from the client: requested service name
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# 1. extracting the requested service from the message
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# 2. connection to the service
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# 3. listening on the service fd
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# 4. bounding both file descriptors (through switchtable hash)
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# 5. indicating that the client is connected (in fdlist)
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# 6. sending an ack to the client
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def websocket_connection_procedure (message : String, clientfd : Int32, context : InstanceStorage)
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# 1. connection to the service
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# 2. listening on the service fd
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# 3. bounding both file descriptors (through switchtable hash)
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# 4. indicating that the client is connected (in is_client)
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def websocket_connection_procedure (requested_service : String, clientfd : Int32, context : InstanceStorage)
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begin
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# 1. reading the service name from the received message
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requested_service = message
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# 2. establishing a connection to the service
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newservice = IPC::Connection.new requested_service
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context.connectionlist[newservice.fd] = newservice
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context.fdtoipcconnection[newservice.fd] = newservice
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# 3. listening on the service fd
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# 3. listening on the client fd and the service fd
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context.service << newservice.fd
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# cannot perform automatic switching due to websockets headers
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# future version of the libipc lib should include some workaround, probably
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# service.switch.add fdclient, newservice.fd
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# 4. bounding the client and the service fd
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@ -189,12 +192,8 @@ def websocket_connection_procedure (message : String, clientfd : Int32, context
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context.switchtable[newservice.fd] = clientfd
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# 5. the client is then connected, send it a message
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context.fdlist[clientfd] = "connected"
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context.fdlist[newservice.fd] = "service"
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# 6. ack
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wsclient = context.wssocklist[clientfd]
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wsclient.send "OK\n"
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context.is_client[clientfd] = true
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context.is_client[newservice.fd] = false
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rescue e
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puts "#{CRED}Exception during connection to the service:#{CRESET} #{e}"
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closing_client clientfd, context
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@ -203,11 +202,10 @@ end
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def websocket_switching_procedure (activefd : Int, context : InstanceStorage)
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begin
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if context.fdlist[activefd] == "connected"
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if context.is_client[activefd]
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# The client is a WebSocket on top of a TCP connection
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client = context.socklist[activefd]
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wsclient = context.wssocklist[activefd]
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client = context.fdtotcpsocket[activefd]
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wsclient = context.fdtows[activefd]
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begin
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message = wsclient.read
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rescue e
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@ -235,32 +233,30 @@ def websocket_switching_procedure (activefd : Int, context : InstanceStorage)
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# XXX: this is not a TCP fd, but since behind the scene this is compatible, I'm hacking a bit
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serv = WrappedTCPFileDescriptor.new(fd: fdservice, family: Socket::Family::INET)
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#serv = context.connectionlist[fdservice]
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#serv = context.fdtoipcconnection[fdservice]
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serv.send message
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elsif context.fdlist[activefd] == "service"
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else
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# puts "switching: service to client"
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# service => client
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fdclient = context.switchtable[activefd]
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wsclient = context.wssocklist[fdclient]
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wsclient = context.fdtows[fdclient]
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serv = context.connectionlist[activefd]
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serv = context.fdtoipcconnection[activefd]
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message = serv.read
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# puts "received message from service: #{message.to_s}"
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buf = message.to_buffer
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# print_hexa String.new(buf), "\033[31m Message to send to the client \033[00m "
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wsclient.send buf
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else
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raise "cannot understand if the fd is a client or a service"
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end
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rescue e
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puts "#{CRED}Exception during message transfer:#{CRESET} #{e}"
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if context.fdlist[activefd] == "service"
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if context.is_client[activefd]
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closing_client activefd, context
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else
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clientfd = context.switchtable[activefd]
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closing_client clientfd, context
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elsif context.fdlist[activefd] == "service"
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closing_client activefd, context
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end
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end
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@ -289,39 +285,8 @@ service.loop do |event|
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end
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# 2. active fd != server fd
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# is this a service or a client?
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activefd = event.connection.fd
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if context.fdlist[activefd] == "not connected"
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# since it's an external communication
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# we have to read the message here, it's not handled by default in libipc
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wsclient = context.wssocklist[activefd]
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begin
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message = wsclient.read
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rescue e
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puts "#{CRED}Exception (receiving a message)#{CRESET} #{e}"
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closing_client activefd, context
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next
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end
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if message.nil?
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puts "#{CBLUE}disconnection of client#{CRESET} #{event.connection.fd}"
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closing_client activefd, context
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next
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end
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# requested service, fd
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websocket_connection_procedure String.new(message), activefd, context
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elsif context.fdlist[activefd] == "connected"
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# the service is sending a message
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websocket_switching_procedure activefd, context
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elsif context.fdlist[activefd] == "service"
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# the service is sending a message
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websocket_switching_procedure activefd, context
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else
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raise "should not happen: client not recorded in fdlist"
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end
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websocket_switching_procedure activefd, context
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when IPC::Event::Switch
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puts "\033[36mIPC::Event::Switch#{CRESET}: from fd #{event.connection.fd}"
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