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playing with websockets

master
Philippe PITTOLI 2019-08-05 01:53:35 +02:00
parent 75197d34e3
commit 608a467f89
1 changed files with 220 additions and 0 deletions

220
src/debuggingws.cr Normal file
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require "option_parser"
require "ipc"
require "socket"
require "./colors"
require "./ws"
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 fdlist : Hash(Int32,String)
property socklist : Hash(Int32, TCPSocket)
property wssocklist : Hash(Int32, WebSocket)
property switchtable : Hash(Int32, Int32)
property connectionlist : Hash(Int32, IPC::Connection)
def initialize (@service : IPC::SwitchingService)
# fdlist_client = [] of TCPSocket
@fdlist = Hash(Int32,String).new
@socklist = Hash(Int32, TCPSocket).new
@wssocklist = Hash(Int32, WebSocket).new
@switchtable = Hash(Int32, Int32).new
@connectionlist = Hash(Int32, IPC::Connection).new
end
def remove_fd (fdclient : Int32)
# 1. closing both the client and the service
fdservice = @switchtable[fdclient]?
tcpfdc = @socklist[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 fdlist
@fdlist = @fdlist.select do |fd,v| fd != fdclient end
unless fdservice.nil?
service = @connectionlist[fdservice]
service.close
@service.remove_fd (fdservice)
@connectionlist = @connectionlist.select do |k, v|
k != fdservice
end
@fdlist = @fdlist.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
# puts "#{headers_header}\n#{headers.to_s}\r\n"
client.send "#{headers_header}\n#{headers.to_s}\r\n"
wsclient = WebSocket.new client
wsclient.send "are we websocket yet?"
# the client is still not connected to a service
context.fdlist[client.fd] = "not connected"
# 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.socklist[client.fd] = client
context.wssocklist[client.fd] = wsclient
end
def closing_client (fdclient : Int, context : InstanceStorage)
# puts "closing the client #{fdclient}"
context.remove_fd fdclient
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
# is this a service or a client?
activefd = event.connection.fd
# since it's an external communication
# we have to read the message here, it's not handled by default in libipc
wsclient = context.wssocklist[activefd]
begin
message = wsclient.read
rescue e
puts "#{CRED}Exception (receiving a message)#{CRESET} #{e}"
end
if message.nil?
puts "#{CBLUE}disconnection of client#{CRESET} #{event.connection.fd}"
closing_client activefd, context
next
end
print_hexa(String.new(message), "#{CBLUE}Received message hexa#{CRESET}")
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