0-error.txt

 0.07s     info: Falcon::Command::Serve [oid=0xc80] [pid=56072] [2020-06-27 15:48:04 +0200]
               | Falcon v0.36.4 taking flight! Using Async::Container::Forked {:count=>1}.
               | - Binding to: #<Falcon::Endpoint http://localhost:8080/ {}>
               | - To terminate: Ctrl-C or kill 56072
               | - To reload configuration: kill -HUP 56072
 0.11s    error: Async::Task [oid=0xc94] [pid=56073] [2020-06-27 15:48:04 +0200]
               |   NoMethodError: undefined method `run' for main:Object
               |   → /home/tom/Code/Code9/projects/ruby-test/src/runtime1.rb:8 in `<top (required)>'
               |     /home/tom/.rvm/gems/ruby-2.7.1/gems/rack-2.2.3/lib/rack/builder.rb:68 in `require'
               |     /home/tom/.rvm/gems/ruby-2.7.1/gems/rack-2.2.3/lib/rack/builder.rb:68 in `parse_file'
               |     /home/tom/.rvm/gems/ruby-2.7.1/gems/falcon-0.36.4/lib/falcon/command/serve.rb:86 in `load_app'
               |     /home/tom/.rvm/gems/ruby-2.7.1/gems/falcon-0.36.4/lib/falcon/controller/serve.rb:52 in `load_app'
               |     /home/tom/.rvm/gems/ruby-2.7.1/gems/falcon-0.36.4/lib/falcon/controller/serve.rb:75 in `block (2 levels) in setup'
               |     /home/tom/.rvm/gems/ruby-2.7.1/gems/async-1.26.2/lib/async/task.rb:258 in `block in make_fiber'
 0.12s     info: Async::Container::Forked [oid=0xcbc] [pid=56072] [2020-06-27 15:48:04 +0200]
               | #<Async::Container::Process Falcon Server> exited with pid 56073 exit 0

1-runtime.rb

#!/usr/bin/env -S falcon serve --bind http://localhost:8080 --count 1 -c

require 'async/websocket/adapters/rack'
require 'set'

$connections = Set.new

run lambda {|env|
	Async::WebSocket::Adapters::Rack.open(env, protocols: ['ws']) do |connection|
		$connections << connection
		
		while message = connection.read
			$connections.each do |connection|
				connection.write(message)
				connection.flush
			end
		end
	ensure
		$connections.delete(connection)
	end or [200, {}, ["Hello World"]]
}