400 lines
11 KiB
Crystal
400 lines
11 KiB
Crystal
require "option_parser"
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require "ipc"
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require "socket"
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require "./colors"
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require "json"
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require "socket"
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require "http/server"
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require "base64"
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require "digest"
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require "./utils"
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# All modifications to standard libraries go there.
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require "./lib_modifications.cr"
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# service instance parameters
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# they can be changed via the cli
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service_name = "websocket"
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host = "0.0.0.0"
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port_to_listen = 1234
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timer_delay = 30.to_i64
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verbosity = 1
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OptionParser.parse do |parser|
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parser.on "-l host", "--l host", "IP address to listen on." do |h|
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host = h
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end
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parser.on "-p port", "--port port", "Port to listen on." do |port|
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port_to_listen = port.to_u16
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end
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parser.on "-s service-name", "--service-name service-name", "Service name." do |name|
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service_name = name
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end
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parser.on "-t timer-delay", "--timer-delay timer-delay", "Timer delay (in seconds)" do |t|
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timer_delay = t.to_i64
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end
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parser.on "-v verbosity-level", "--verbosity level", "Verbosity." do |opt|
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verbosity = opt.to_i
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end
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parser.on "-h", "--help", "Show this help" do
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puts parser
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exit 0
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end
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end
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# Link between fd and TCPSocket, WebSocket and IPC::Connection instances.
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class InstanceStorage
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property service : IPC::SwitchingService
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property switchtable : Hash(Int32, Int32)
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property is_client : Hash(Int32,Bool)
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property is_json : Hash(Int32, Bool)
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property fd_to_tcpsocket : Hash(Int32, TCPSocket)
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property fd_to_websocket : Hash(Int32, WebSocket)
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property fd_to_ipcconnection : 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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@switchtable = Hash(Int32, Int32).new
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@is_client = Hash(Int32,Bool).new
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@is_json = Hash(Int32,Bool).new
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@fd_to_tcpsocket = Hash(Int32, TCPSocket).new
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@fd_to_websocket = Hash(Int32, WebSocket).new
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@fd_to_ipcconnection = Hash(Int32, IPC::Connection).new
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end
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def remove_fd (fdclient : Int32)
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puts "#{CBLUE}closing the client:#{CRESET} #{fdclient}"
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# 1. closing both the client and the service
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fdservice = @switchtable[fdclient]?
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tcpfdc = @fd_to_tcpsocket[fdclient]
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# 2. closing the TCP connections
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tcpfdc.close unless tcpfdc.closed?
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# 3. removing the client and the service fds from the loop check
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@service.remove_fd (fdclient)
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# 5. removing both the client and the service from the switchtable
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@switchtable = @switchtable.select do |fdc, fds|
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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 is_client
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@is_client = @is_client.select do |fd,v| fd != fdclient end
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@is_json = @is_json.select do |fd,v| fd != fdclient end
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@fd_to_websocket.select! do |fd, ws|
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fd != fdclient
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end
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unless fdservice.nil?
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service = @fd_to_ipcconnection[fdservice]
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service.close
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@service.remove_fd (fdservice)
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@fd_to_ipcconnection = @fd_to_ipcconnection.select do |k, v|
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k != fdservice
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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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# by default, listen on any IP address
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server = TCPServer.new(host, port_to_listen)
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service = IPC::SwitchingService.new service_name
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service << server.fd
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context = InstanceStorage.new service
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def websocket_client_connection(client, context : InstanceStorage)
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request = HTTP::Request.from_io client
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# pp! request
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if request.nil?
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raise "#REQUEST IS NIL"
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end
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if request.is_a? HTTP::Status && request == HTTP::Status::BAD_REQUEST
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raise "BAD REQUEST DAZE~"
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end
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if request.is_a? HTTP::Status
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raise "Not bad request but still pretty bad: #{request.to_s}"
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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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# HTTP inside bru
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headers_header = "HTTP/1.1 101 Switching Protocols"
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headers = HTTP::Headers {
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"Upgrade" => "websocket",
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"Connection" => "Upgrade",
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"Sec-WebSocket-Accept" => response_key
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}
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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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return
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end
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# The client may ask to transcript JSON-based messages into IPC messages.
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# To that end, the client may send the name of the service it wants to reach with the prefix ".JSON".
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if req_service.ends_with? ".JSON"
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context.is_json[client.fd] = true
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req_service = req_service.gsub /.JSON$/, ""
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else
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context.is_json[client.fd] = false
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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.on_pong do |m|
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puts "pong #{m}"
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end
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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.fd_to_tcpsocket[client.fd] = client
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context.fd_to_websocket[client.fd] = wsclient
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end
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def closing_client (fdclient : Int, context : InstanceStorage)
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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. 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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# 2. establishing a connection to the service
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newservice = IPC::Connection.new requested_service
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context.fd_to_ipcconnection[newservice.fd] = newservice
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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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context.switchtable[clientfd] = newservice.fd
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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.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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context.remove_fd clientfd
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end
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end
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def websocket_switching_procedure (activefd : Int, context : InstanceStorage)
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begin
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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.fd_to_tcpsocket[activefd]
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wsclient = context.fd_to_websocket[activefd]
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loop do
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begin
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message = wsclient.run_once
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rescue e
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puts "#{CRED}Exception (receiving a message)#{CRESET} #{e}"
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context.remove_fd activefd
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return
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end
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# Checking the internals of WebSocket, then the contained IO within, to know if there is still something to read in the socket.
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still_something_to_read = ! wsclient.ws.io.empty?
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if wsclient.closed?
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# puts "#{CBLUE}client is closed#{CRESET}"
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context.remove_fd client.fd
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return
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end
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if message.nil?
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puts "#{CRED}message is nil#{CRESET}"
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context.remove_fd client.fd
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return
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end
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case message
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when WebSocket::Error
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puts "#{CRED}An error occured#{CRESET}"
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context.remove_fd client.fd
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return
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when WebSocket::Ping
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# puts "#{CBLUE}Received a ping message#{CRESET}"
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next if still_something_to_read
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break
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when WebSocket::Pong
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# puts "#{CBLUE}Received a pong message#{CRESET}"
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next if still_something_to_read
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break
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when WebSocket::Close
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# puts "#{CBLUE}Received a close message#{CRESET}"
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context.remove_fd client.fd
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return
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when WebSocket::NotFinal
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# puts "#{CBLUE}Received only part of a message#{CRESET}"
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next if still_something_to_read
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break
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when Bytes
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# TODO: when receiving a binary message
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# we should test the format and maybe its content
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# puts "#{CBLUE}Received a binary message#{CRESET}"
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end
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if context.is_json[activefd] && message.is_a?(String)
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message = IPC::Message.from_json(message).to_packet
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end
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# client => service
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fdservice = context.switchtable[activefd]
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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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# Also, I changed the "finalize" method of the TCPFileDescriptor class not to close the socket
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# when the object is GC.
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serv = WrappedTCPFileDescriptor.new(fd: fdservice, family: Socket::Family::INET)
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#serv = context.fd_to_ipcconnection[fdservice]
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serv.send message
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break unless still_something_to_read
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end # loop over the remaining messages to read on the websocket
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else
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# service => client
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fdclient = context.switchtable[activefd]
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wsclient = context.fd_to_websocket[fdclient]
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serv = context.fd_to_ipcconnection[activefd]
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message = serv.read
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if context.is_json[fdclient]
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buf = message.to_json
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else
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buf = message.to_packet
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end
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wsclient.send buf
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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.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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end
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end
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end
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def sending_ping_messages(context : InstanceStorage)
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context.fd_to_websocket.each do |fd, ws|
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begin
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ws.ping "hello from #{fd}"
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rescue e
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puts "#{CRED}Exception: #{e}#{CRESET}, already closed client #{fd}"
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begin
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context.remove_fd fd
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rescue e
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puts "#{CRED}Cannot remove #{fd} from clients: #{e}#{CRESET}"
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end
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end
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end
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end
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# Every few seconds, the service should trigger the timer
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# Allowing the sending of Ping messages to clients
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service.base_timer = timer_delay
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service.loop do |event|
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case event
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when IPC::Event::Timer
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if verbosity > 0
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puts "#{CORANGE}IPC::Event::Timer#{CRESET}"
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end
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sending_ping_messages context
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when IPC::Event::Connection
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if verbosity > 0
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puts "#{CBLUE}IPC::Event::Connection#{CRESET}: #{event.connection.fd}"
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end
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when IPC::Event::Disconnection
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if verbosity > 0
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puts "#{CBLUE}IPC::Event::Disconnection#{CRESET}: #{event.connection.fd}"
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end
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when IPC::Event::ExtraSocket
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if verbosity > 0
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puts "#{CBLUE}IPC::Event::ExtraSocket#{CRESET}: #{event.connection.fd}"
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end
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# 1. accept new websocket clients
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if server.fd == event.connection.fd
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client = server.accept
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begin
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websocket_client_connection client, context
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puts "#{CBLUE}new client:#{CRESET} #{client.fd}" unless verbosity == 0
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rescue e
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puts "Exception: #{CRED}#{e}#{CRESET}"
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client.close
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end
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next
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end
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# 2. active fd != server fd
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activefd = event.connection.fd
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websocket_switching_procedure activefd, context
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when IPC::Event::Switch
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if verbosity > 0
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puts "\033[36mIPC::Event::Switch#{CRESET}: from fd #{event.connection.fd}"
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end
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raise "Not implemented."
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# IPC::Event::Message has to be the last entry
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# because ExtraSocket and Switch inherit from Message class
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when IPC::Event::Message
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if verbosity > 0
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puts "#{CBLUE}IPC::Event::Message#{CRESET}: #{event.connection.fd}"
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end
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raise "Not implemented."
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end
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end
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