356 lines
9.4 KiB
Crystal
356 lines
9.4 KiB
Crystal
require "option_parser"
|
|
require "ipc"
|
|
require "socket"
|
|
require "./colors"
|
|
require "./ws"
|
|
|
|
require "json"
|
|
|
|
require "socket"
|
|
require "http"
|
|
require "http/server"
|
|
require "base64"
|
|
require "digest"
|
|
require "./utils"
|
|
|
|
class IPC::Connection
|
|
def initialize(fd : Int32)
|
|
external_connection = LibIPC::Connection.new
|
|
external_connection.fd = fd
|
|
initialize(external_connection)
|
|
end
|
|
end
|
|
|
|
class IPC::Message
|
|
def to_buffer
|
|
to_message @type, String.new(@payload)
|
|
end
|
|
end
|
|
|
|
|
|
class WrappedTCPFileDescriptor < TCPSocket
|
|
# do not close the connection when garbage collected!!
|
|
def finalize
|
|
# puts "WrappedTCPFileDescriptor garbage collection!!"
|
|
# super
|
|
end
|
|
end
|
|
|
|
service_name = "websocket"
|
|
port_to_listen = 1234
|
|
|
|
OptionParser.parse! do |parser|
|
|
parser.on "-p port", "--port port", "Port to listen on." do |port|
|
|
port_to_listen = port.to_u16
|
|
end
|
|
|
|
parser.on "-s service-name", "--service-name service-name", "Service name." do |name|
|
|
service_name = name
|
|
end
|
|
|
|
parser.on "-h", "--help", "Show this help" do
|
|
puts parser
|
|
exit 0
|
|
end
|
|
end
|
|
|
|
|
|
class InstanceStorage
|
|
property service : IPC::SwitchingService
|
|
property switchtable : Hash(Int32, Int32)
|
|
property is_client : Hash(Int32,Bool)
|
|
property is_json : Hash(Int32, Bool)
|
|
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
|
|
@switchtable = Hash(Int32, Int32).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 = @fd_to_tcpsocket[fdclient]
|
|
|
|
# 2. closing the TCP connections
|
|
tcpfdc.close unless tcpfdc.closed?
|
|
|
|
# 3. removing the client and the service fds from the loop check
|
|
@service.remove_fd (fdclient)
|
|
|
|
# 5. removing both the client and the service from the switchtable
|
|
@switchtable = @switchtable.select do |fdc, fds|
|
|
fdc != fdclient && fds != fdclient
|
|
end
|
|
|
|
# 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 = @fd_to_ipcconnection[fdservice]
|
|
service.close
|
|
@service.remove_fd (fdservice)
|
|
@fd_to_ipcconnection = @fd_to_ipcconnection.select do |k, v|
|
|
k != fdservice
|
|
end
|
|
|
|
@is_client = @is_client.select do |fd,v| fd != fdservice end
|
|
end
|
|
end
|
|
end
|
|
|
|
server = TCPServer.new("localhost", port_to_listen)
|
|
service = IPC::SwitchingService.new service_name
|
|
service << server.fd
|
|
context = InstanceStorage.new service
|
|
|
|
|
|
|
|
def websocket_client_connection(client, context : InstanceStorage)
|
|
request = HTTP::Request.from_io client
|
|
# pp! request
|
|
|
|
if request.nil?
|
|
raise "#REQUEST IS NIL"
|
|
end
|
|
|
|
if request.is_a? HTTP::Request::BadRequest
|
|
raise "BAD REQUEST DAZE~"
|
|
end
|
|
|
|
# FIXME: check they actually wanted to upgrade to websocket
|
|
key = request.headers["Sec-WebSocket-Key"]
|
|
response_key = Digest::SHA1.base64digest key + "258EAFA5-E914-47DA-95CA-C5AB0DC85B11"
|
|
# puts response_key
|
|
|
|
# HTTP inside bru
|
|
headers_header = "HTTP/1.1 101 Switching Protocols"
|
|
headers = HTTP::Headers {
|
|
"Upgrade" => "websocket",
|
|
"Connection" => "Upgrade",
|
|
"Sec-WebSocket-Accept" => response_key
|
|
}
|
|
|
|
headers = headers.map { |key, value| "#{key}: #{value[0]}\r\n" }.join
|
|
|
|
# requested service, fd
|
|
req_service = request.path.lchop
|
|
if req_service.empty?
|
|
client.close
|
|
puts "should send a PATH"
|
|
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
|
|
context.is_client[client.fd] = true
|
|
|
|
# listen to the client's file descriptor
|
|
context.service << client.fd
|
|
# puts "#{CBLUE}new client: #{client.fd}#{CRESET}"
|
|
|
|
# registering the client into storing structures to avoid being garbage collected
|
|
context.fd_to_tcpsocket[client.fd] = client
|
|
context.fd_to_websocket[client.fd] = wsclient
|
|
end
|
|
|
|
|
|
def closing_client (fdclient : Int, context : InstanceStorage)
|
|
puts "#{CBLUE}closing the client:#{CRESET} #{fdclient}"
|
|
context.remove_fd fdclient
|
|
end
|
|
|
|
# first message from the client: requested service name
|
|
# 1. connection to the service
|
|
# 2. listening on the service fd
|
|
# 3. bounding both file descriptors (through switchtable hash)
|
|
# 4. indicating that the client is connected (in is_client)
|
|
def websocket_connection_procedure (requested_service : String, clientfd : Int32, context : InstanceStorage)
|
|
begin
|
|
# 2. establishing a connection to the service
|
|
newservice = IPC::Connection.new requested_service
|
|
context.fd_to_ipcconnection[newservice.fd] = newservice
|
|
|
|
# 3. listening on the client fd and the service fd
|
|
context.service << newservice.fd
|
|
|
|
# cannot perform automatic switching due to websockets headers
|
|
# future version of the libipc lib should include some workaround, probably
|
|
# service.switch.add fdclient, newservice.fd
|
|
|
|
# 4. bounding the client and the service fd
|
|
context.switchtable[clientfd] = newservice.fd
|
|
context.switchtable[newservice.fd] = clientfd
|
|
|
|
# 5. the client is then connected, send it a message
|
|
context.is_client[clientfd] = true
|
|
context.is_client[newservice.fd] = false
|
|
rescue e
|
|
puts "#{CRED}Exception during connection to the service:#{CRESET} #{e}"
|
|
closing_client clientfd, context
|
|
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.fd_to_tcpsocket[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
|
|
return
|
|
end
|
|
|
|
if wsclient.closed?
|
|
# puts "#{CBLUE}client is closed#{CRESET}"
|
|
closing_client client.fd, context
|
|
return
|
|
end
|
|
|
|
if message.nil?
|
|
puts "#{CRED}message is nil#{CRESET}"
|
|
closing_client client.fd, context
|
|
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
|
|
fdservice = context.switchtable[activefd]
|
|
|
|
# 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.fd_to_ipcconnection[fdservice]
|
|
serv.send message
|
|
|
|
else
|
|
# puts "switching: service to client"
|
|
# service => client
|
|
|
|
fdclient = context.switchtable[activefd]
|
|
wsclient = context.fd_to_websocket[fdclient]
|
|
|
|
serv = context.fd_to_ipcconnection[activefd]
|
|
message = serv.read
|
|
# puts "received message from service: #{message.to_s}"
|
|
|
|
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
|
|
puts "#{CRED}Exception during message transfer:#{CRESET} #{e}"
|
|
if context.is_client[activefd]
|
|
closing_client activefd, context
|
|
else
|
|
clientfd = context.switchtable[activefd]
|
|
closing_client clientfd, context
|
|
end
|
|
end
|
|
|
|
end
|
|
|
|
service.loop do |event|
|
|
case event
|
|
when IPC::Event::Connection
|
|
puts "#{CBLUE}IPC::Event::Connection: #{event.connection.fd}#{CRESET}"
|
|
when IPC::Event::Disconnection
|
|
puts "#{CBLUE}IPC::Event::Disconnection: #{event.connection.fd}#{CRESET}"
|
|
when IPC::Event::ExtraSocket
|
|
puts "#{CBLUE}IPC::Event::ExtraSocket#{CRESET}"
|
|
|
|
# 1. accept new websocket clients
|
|
if server.fd == event.connection.fd
|
|
client = server.accept
|
|
begin
|
|
websocket_client_connection client, context
|
|
puts "#{CBLUE}new client:#{CRESET} #{client.fd}"
|
|
rescue e
|
|
puts "Exception: #{CRED}#{e}#{CRESET}"
|
|
client.close
|
|
end
|
|
next
|
|
end
|
|
|
|
# 2. active fd != server fd
|
|
activefd = event.connection.fd
|
|
websocket_switching_procedure activefd, context
|
|
|
|
when IPC::Event::Switch
|
|
puts "\033[36mIPC::Event::Switch#{CRESET}: from fd #{event.connection.fd}"
|
|
|
|
raise "Not implemented."
|
|
|
|
# IPC::Event::Message has to be the last entry
|
|
# because ExtraSocket and Switch inherit from Message class
|
|
when IPC::Event::Message
|
|
puts "#{CBLUE}IPC::Event::Message#{CRESET}: #{event.connection.fd}"
|
|
|
|
raise "Not implemented."
|
|
end
|
|
end
|