Simple Crystal Chat Server

crystal_chat.cr

require "http/server"

SOCKETS = [] of HTTP::WebSocketHandler::WebSocketSession

ws_handler = HTTP::WebSocketHandler.new do |socket|
  puts "Socket opened"
  SOCKETS << socket

  socket.on_message do |message|
    SOCKETS.each { |socket| socket.send "Echo back from server: #{message}" }
  end

  socket.on_close do
    puts "Socket closed"
  end
end

server = HTTP::Server.new("0.0.0.0", "3000", [ws_handler])
server.listen