327 lines
8.8 KiB
Crystal
327 lines
8.8 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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require "./instance_storage.cr"
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# All modifications to standard libraries go there.
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require "./lib_modifications.cr"
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class CLI
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# service instance parameters
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# they can be changed via the cli
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class_property service_name : String = "websocket"
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class_property host : String = "0.0.0.0"
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class_property port_to_listen : UInt16 = 1234
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class_property timer_delay : Int32 = 30_000 # 30 seconds
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class_property verbosity : Int32 = 1
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end
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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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CLI.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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CLI.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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CLI.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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CLI.timer_delay = t.to_i32 * 1000 # stored in ms
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end
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parser.on "-v verbosity-level", "--verbosity level", "Verbosity." do |opt|
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CLI.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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def sending_ping_messages
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Context.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.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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def ws_http_upgrade(client)
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request = HTTP::Request.from_io client
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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.ends_with? ".JSON"
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Context.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.context.is_json[client.fd] = false
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end
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# TODO: if trackerd, send the IP address of the client
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# if req_service == "tracker"
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# puts "tracker - sending the IP address"
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# puts "connection from #{client.remote_address}"
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# sfd = Context.context.switchtable[client.fd]
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# # message = IPC::Message.from_json(JSON).to_packet
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# # => JSON has to include these attributes: mtype, utype, payload
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# # message = IPC::Message.new mtype, utype, payload
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# remote_address = client.remote_address.address
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# message = IPC::Message.new 1, 1.to_u8, "{\"ipaddress\": \"#{remote_address}\"}"
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# serv = WrappedTCPFileDescriptor.new(fd: sfd, family: Socket::Family::INET)
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# serv.send message.to_packet
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# end
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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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# registering the client into storing structures to avoid being garbage collected
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Context.context.fd_to_socket[client.fd] = client
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Context.context.fd_to_websocket[client.fd] = wsclient
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req_service
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rescue e
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puts "#{CRED}Exception in ws_http_upgrade#{CRESET}: #{CBLUE}#{e}#{CRESET}"
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raise "DROP IT"
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end
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def handle_new_clients(service, server)
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# TODO: this is a lot of C-like notation, should be changed.
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# In the client accept function
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# 1. accept TCP/WS connection
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client = server.accept
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# 2. upgrade HTTP connections and get the service name in the URI path.
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req_service = ws_http_upgrade client
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# 3. connect to the service via ipc_connection_switched
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serverfd = 0
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# LibIPC.ipc_connection_switched service.pointer, req_service, client.fd, Pointer(Libc::Int).null
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LibIPC.ipc_connection_switched service.pointer, req_service, client.fd, pointerof (serverfd)
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proc_cb_in = ->ws_cb_in(Int32, Pointer(LibIPC::Message))
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proc_cb_out = ->ws_cb_out(Int32, Pointer(LibIPC::Message))
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# 4. change client callbacks via ipc_switching_callbacks
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# only the client callbacks are changed, since the associated server is a simple libipc service
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LibIPC.ipc_switching_callbacks service.pointer, client.fd, proc_cb_in, proc_cb_out
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info "#{CBLUE}new client:#{CRESET} #{client.fd}"
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rescue e
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puts "Exception in handle_new_client: #{CRED}#{e}#{CRESET}"
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unless client.nil?
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client.close
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end
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end
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def ws_cb_out(fd : Int32, pm : Pointer(LibIPC::Message))
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info "OUT fd is #{fd}"
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wsclient = Context.context.fd_to_websocket[fd]
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message = IPC::Message.new pm
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# pp! message
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if Context.context.is_json[fd]
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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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return LibIPC::IPCCB::NoError
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rescue e
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puts "#{CRED}Exception during message transfer:#{CRESET} #{e}"
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Context.context.remove_fd fd
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return LibIPC::IPCCB::Error
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end
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def ws_cb_in(fd : Int32, pm : LibIPC::Message*)
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info "IN fd is #{fd}"
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wsclient = Context.context.fd_to_websocket[fd]
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message = nil
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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}run_once FAILED#{CRESET}: #{e}"
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Context.context.remove_fd fd
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return LibIPC::IPCCB::Error
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end
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if wsclient.closed?
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info "#{CBLUE}client is closed#{CRESET}"
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Context.context.remove_fd fd
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return LibIPC::IPCCB::Closing
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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.context.remove_fd fd
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return LibIPC::IPCCB::Closing
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end
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case message
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when String
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if Context.context.is_json[fd]
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ipc_message = IPC::Message.from_json(message)
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ipc_message.copy_to_message_pointer pm
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return LibIPC::IPCCB::NoError
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end
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else
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# every other option should be dropped
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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.context.remove_fd fd
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return LibIPC::IPCCB::Error
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when WebSocket::Ping
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puts "#{CBLUE}Received a ping message#{CRESET}"
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Context.context.remove_fd fd
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return LibIPC::IPCCB::Ignore
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when WebSocket::Pong
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puts "#{CBLUE}Received a pong message#{CRESET}"
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return LibIPC::IPCCB::Ignore
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when WebSocket::Close
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puts "#{CBLUE}Received a close message#{CRESET}"
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Context.context.remove_fd fd
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return LibIPC::IPCCB::Closing
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when WebSocket::NotFinal
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puts "#{CBLUE}Received only part of a message: NOT IMPLEMENTED#{CRESET}"
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Context.context.remove_fd fd
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return LibIPC::IPCCB::Error
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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: NOT IMPLEMENTED, YET#{CRESET}"
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Context.context.remove_fd fd
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return LibIPC::IPCCB::Error
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else
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puts "#{CRED}Received a websocket message with unknown type#{CRESET}"
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end
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end
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return LibIPC::IPCCB::Error
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rescue e
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puts "#{CRED}Exception (receiving a message)#{CRESET} #{e}"
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# tcp = WrappedTCPFileDescriptor.new(fd: fd, family: Socket::Family::INET)
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# tcp.close
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Context.context.remove_fd fd
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return LibIPC::IPCCB::Error
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end
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def info(str : String)
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if CLI.verbosity > 0
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puts str
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end
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end
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class Context
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class_property context = InstanceStorage.new
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end
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def main
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# by default, listen on any IP address
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server = TCPServer.new(CLI.host, CLI.port_to_listen)
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service = IPC::Server.new CLI.service_name
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service << server.fd
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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 = CLI.timer_delay
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service.timer = CLI.timer_delay
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service.loop do |event|
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# info "current state of the context:"
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service.pp
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case event
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when IPC::Event::Timer
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info "#{CORANGE}IPC::Event::Timer#{CRESET}"
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sending_ping_messages
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when IPC::Event::Connection
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info "#{CBLUE}IPC::Event::Connection#{CRESET}: #{event.fd}"
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when IPC::Event::Disconnection
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info "#{CBLUE}IPC::Event::Disconnection#{CRESET}: #{event.fd}"
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Context.context.remove_fd event.fd
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when IPC::Event::ExtraSocket
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info "#{CBLUE}IPC::Event::ExtraSocket#{CRESET}: #{event.fd}"
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if server.fd != event.fd
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raise "Error: the only extra socket should be the TCP/WS server"
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end
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handle_new_clients(service, server)
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when IPC::Event::Switch
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info "\033[36mIPC::Event::Switch#{CRESET}: from fd #{event.fd}"
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# raise "Not implemented."
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when IPC::Event::MessageSent
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info "Message sent, for #{event.fd}"
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when IPC::Event::MessageReceived
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info "#{CBLUE}IPC::Event::Message#{CRESET}: #{event.fd}"
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raise "Not implemented."
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end
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end
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end
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main
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