327 lines
8.8 KiB
Crystal
327 lines
8.8 KiB
Crystal
require "option_parser"
|
||
require "ipc"
|
||
require "socket"
|
||
require "./colors"
|
||
|
||
require "json"
|
||
|
||
require "socket"
|
||
require "http/server"
|
||
require "base64"
|
||
require "digest"
|
||
require "./utils"
|
||
|
||
require "./instance_storage.cr"
|
||
|
||
# All modifications to standard libraries go there.
|
||
require "./lib_modifications.cr"
|
||
|
||
class CLI
|
||
# service instance parameters
|
||
# they can be changed via the cli
|
||
class_property service_name : String = "websocket"
|
||
class_property host : String = "0.0.0.0"
|
||
class_property port_to_listen : UInt16 = 1234
|
||
class_property timer_delay : Int32 = 30_000 # 30 seconds
|
||
class_property verbosity : Int32 = 1
|
||
end
|
||
|
||
OptionParser.parse do |parser|
|
||
parser.on "-l host", "--l host", "IP address to listen on." do |h|
|
||
CLI.host = h
|
||
end
|
||
|
||
parser.on "-p port", "--port port", "Port to listen on." do |port|
|
||
CLI.port_to_listen = port.to_u16
|
||
end
|
||
|
||
parser.on "-s service-name", "--service-name service-name", "Service name." do |name|
|
||
CLI.service_name = name
|
||
end
|
||
|
||
parser.on "-t timer-delay", "--timer-delay timer-delay", "Timer delay (in seconds)" do |t|
|
||
CLI.timer_delay = t.to_i32 * 1000 # stored in ms
|
||
end
|
||
|
||
parser.on "-v verbosity-level", "--verbosity level", "Verbosity." do |opt|
|
||
CLI.verbosity = opt.to_i
|
||
end
|
||
|
||
parser.on "-h", "--help", "Show this help" do
|
||
puts parser
|
||
exit 0
|
||
end
|
||
end
|
||
|
||
def sending_ping_messages
|
||
Context.context.fd_to_websocket.each do |fd, ws|
|
||
begin
|
||
ws.ping "hello from #{fd}"
|
||
rescue e
|
||
puts "#{CRED}Exception: #{e}#{CRESET}, already closed client #{fd}"
|
||
begin
|
||
Context.context.remove_fd fd
|
||
rescue e
|
||
puts "#{CRED}Cannot remove #{fd} from clients: #{e}#{CRESET}"
|
||
end
|
||
end
|
||
end
|
||
end
|
||
|
||
def ws_http_upgrade(client)
|
||
request = HTTP::Request.from_io client
|
||
|
||
if request.nil?
|
||
raise "#REQUEST IS NIL"
|
||
end
|
||
|
||
if request.is_a? HTTP::Status && request == HTTP::Status::BAD_REQUEST
|
||
raise "BAD REQUEST DAZE~"
|
||
end
|
||
|
||
if request.is_a? HTTP::Status
|
||
raise "Not bad request but still pretty bad: #{request.to_s}"
|
||
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.ends_with? ".JSON"
|
||
Context.context.is_json[client.fd] = true
|
||
req_service = req_service.gsub /.JSON$/, ""
|
||
else
|
||
Context.context.is_json[client.fd] = false
|
||
end
|
||
|
||
# TODO: if trackerd, send the IP address of the client
|
||
# if req_service == "tracker"
|
||
# puts "tracker - sending the IP address"
|
||
# puts "connection from #{client.remote_address}"
|
||
# sfd = Context.context.switchtable[client.fd]
|
||
# # message = IPC::Message.from_json(JSON).to_packet
|
||
# # => JSON has to include these attributes: mtype, utype, payload
|
||
# # message = IPC::Message.new mtype, utype, payload
|
||
# remote_address = client.remote_address.address
|
||
# message = IPC::Message.new 1, 1.to_u8, "{\"ipaddress\": \"#{remote_address}\"}"
|
||
# serv = WrappedTCPFileDescriptor.new(fd: sfd, family: Socket::Family::INET)
|
||
# serv.send message.to_packet
|
||
# end
|
||
|
||
# puts "#{headers_header}\n#{headers.to_s}\r\n"
|
||
client.send "#{headers_header}\n#{headers.to_s}\r\n"
|
||
|
||
wsclient = WebSocket.new client
|
||
wsclient.on_pong do |m|
|
||
puts "pong #{m}"
|
||
end
|
||
|
||
# registering the client into storing structures to avoid being garbage collected
|
||
Context.context.fd_to_socket[client.fd] = client
|
||
Context.context.fd_to_websocket[client.fd] = wsclient
|
||
|
||
req_service
|
||
rescue e
|
||
puts "#{CRED}Exception in ws_http_upgrade#{CRESET}: #{CBLUE}#{e}#{CRESET}"
|
||
raise "DROP IT"
|
||
end
|
||
|
||
def handle_new_clients(service, server)
|
||
# TODO: this is a lot of C-like notation, should be changed.
|
||
# In the client accept function
|
||
# 1. accept TCP/WS connection
|
||
client = server.accept
|
||
|
||
# 2. upgrade HTTP connections and get the service name in the URI path.
|
||
req_service = ws_http_upgrade client
|
||
|
||
# 3. connect to the service via ipc_connection_switched
|
||
serverfd = 0
|
||
# LibIPC.ipc_connection_switched service.pointer, req_service, client.fd, Pointer(Libc::Int).null
|
||
LibIPC.ipc_connection_switched service.pointer, req_service, client.fd, pointerof (serverfd)
|
||
|
||
proc_cb_in = ->ws_cb_in(Int32, Pointer(LibIPC::Message))
|
||
proc_cb_out = ->ws_cb_out(Int32, Pointer(LibIPC::Message))
|
||
|
||
# 4. change client callbacks via ipc_switching_callbacks
|
||
# only the client callbacks are changed, since the associated server is a simple libipc service
|
||
LibIPC.ipc_switching_callbacks service.pointer, client.fd, proc_cb_in, proc_cb_out
|
||
|
||
info "#{CBLUE}new client:#{CRESET} #{client.fd}"
|
||
rescue e
|
||
puts "Exception in handle_new_client: #{CRED}#{e}#{CRESET}"
|
||
unless client.nil?
|
||
client.close
|
||
end
|
||
end
|
||
|
||
def ws_cb_out(fd : Int32, pm : Pointer(LibIPC::Message))
|
||
info "OUT fd is #{fd}"
|
||
wsclient = Context.context.fd_to_websocket[fd]
|
||
|
||
message = IPC::Message.new pm
|
||
# pp! message
|
||
|
||
if Context.context.is_json[fd]
|
||
buf = message.to_json
|
||
else
|
||
buf = message.to_packet
|
||
end
|
||
|
||
wsclient.send buf
|
||
|
||
return LibIPC::IPCCB::NoError
|
||
rescue e
|
||
puts "#{CRED}Exception during message transfer:#{CRESET} #{e}"
|
||
Context.context.remove_fd fd
|
||
return LibIPC::IPCCB::Error
|
||
end
|
||
|
||
def ws_cb_in(fd : Int32, pm : LibIPC::Message*)
|
||
info "IN fd is #{fd}"
|
||
|
||
wsclient = Context.context.fd_to_websocket[fd]
|
||
|
||
message = nil
|
||
begin
|
||
message = wsclient.run_once
|
||
rescue e
|
||
puts "#{CRED}run_once FAILED#{CRESET}: #{e}"
|
||
Context.context.remove_fd fd
|
||
return LibIPC::IPCCB::Error
|
||
end
|
||
|
||
if wsclient.closed?
|
||
info "#{CBLUE}client is closed#{CRESET}"
|
||
Context.context.remove_fd fd
|
||
return LibIPC::IPCCB::Closing
|
||
end
|
||
|
||
if message.nil?
|
||
puts "#{CRED}message is nil#{CRESET}"
|
||
Context.context.remove_fd fd
|
||
return LibIPC::IPCCB::Closing
|
||
end
|
||
|
||
case message
|
||
when String
|
||
if Context.context.is_json[fd]
|
||
ipc_message = IPC::Message.from_json(message)
|
||
ipc_message.copy_to_message_pointer pm
|
||
return LibIPC::IPCCB::NoError
|
||
end
|
||
else
|
||
# every other option should be dropped
|
||
case message
|
||
when WebSocket::Error
|
||
puts "#{CRED}An error occured#{CRESET}"
|
||
Context.context.remove_fd fd
|
||
return LibIPC::IPCCB::Error
|
||
when WebSocket::Ping
|
||
puts "#{CBLUE}Received a ping message#{CRESET}"
|
||
Context.context.remove_fd fd
|
||
return LibIPC::IPCCB::Ignore
|
||
when WebSocket::Pong
|
||
puts "#{CBLUE}Received a pong message#{CRESET}"
|
||
return LibIPC::IPCCB::Ignore
|
||
when WebSocket::Close
|
||
puts "#{CBLUE}Received a close message#{CRESET}"
|
||
Context.context.remove_fd fd
|
||
return LibIPC::IPCCB::Closing
|
||
when WebSocket::NotFinal
|
||
puts "#{CBLUE}Received only part of a message: NOT IMPLEMENTED#{CRESET}"
|
||
Context.context.remove_fd fd
|
||
return LibIPC::IPCCB::Error
|
||
when Bytes
|
||
# TODO: when receiving a binary message
|
||
# we should test the format and maybe its content
|
||
puts "#{CBLUE}Received a binary message: NOT IMPLEMENTED, YET#{CRESET}"
|
||
Context.context.remove_fd fd
|
||
return LibIPC::IPCCB::Error
|
||
else
|
||
puts "#{CRED}Received a websocket message with unknown type#{CRESET}"
|
||
end
|
||
end
|
||
|
||
return LibIPC::IPCCB::Error
|
||
|
||
rescue e
|
||
puts "#{CRED}Exception (receiving a message)#{CRESET} #{e}"
|
||
# tcp = WrappedTCPFileDescriptor.new(fd: fd, family: Socket::Family::INET)
|
||
# tcp.close
|
||
Context.context.remove_fd fd
|
||
return LibIPC::IPCCB::Error
|
||
end
|
||
|
||
def info(str : String)
|
||
if CLI.verbosity > 0
|
||
puts str
|
||
end
|
||
end
|
||
|
||
class Context
|
||
class_property context = InstanceStorage.new
|
||
end
|
||
|
||
def main
|
||
# by default, listen on any IP address
|
||
server = TCPServer.new(CLI.host, CLI.port_to_listen)
|
||
service = IPC::Server.new CLI.service_name
|
||
service << server.fd
|
||
|
||
# Every few seconds, the service should trigger the timer
|
||
# Allowing the sending of Ping messages to clients
|
||
service.base_timer = CLI.timer_delay
|
||
service.timer = CLI.timer_delay
|
||
|
||
service.loop do |event|
|
||
# info "current state of the context:"
|
||
# service.pp
|
||
case event
|
||
when IPC::Event::Timer
|
||
info "#{CORANGE}IPC::Event::Timer#{CRESET}"
|
||
sending_ping_messages
|
||
|
||
when IPC::Event::Connection
|
||
info "#{CBLUE}IPC::Event::Connection#{CRESET}: #{event.fd}"
|
||
when IPC::Event::Disconnection
|
||
info "#{CBLUE}IPC::Event::Disconnection#{CRESET}: #{event.fd}"
|
||
Context.context.remove_fd event.fd
|
||
when IPC::Event::ExtraSocket
|
||
info "#{CBLUE}IPC::Event::ExtraSocket#{CRESET}: #{event.fd}"
|
||
if server.fd != event.fd
|
||
raise "Error: the only extra socket should be the TCP/WS server"
|
||
end
|
||
handle_new_clients(service, server)
|
||
|
||
when IPC::Event::Switch
|
||
info "\033[36mIPC::Event::Switch#{CRESET}: from fd #{event.fd}"
|
||
# raise "Not implemented."
|
||
|
||
when IPC::Event::MessageSent
|
||
info "Message sent, for #{event.fd}"
|
||
|
||
when IPC::Event::MessageReceived
|
||
info "#{CBLUE}IPC::Event::Message#{CRESET}: #{event.fd}"
|
||
|
||
raise "Not implemented."
|
||
end
|
||
end
|
||
end
|
||
|
||
main
|