ruby - Detect when user leaves an event stream -


i'm trying make chatroom scratch using sinatra. need detect when user leaves page. @ first, thinking using javascript onbeforeunload function, users fake leaving or leave without notifying server.

my code stream part looks this: 

get '/stream', :provides => 'text/event-stream'   stream :keep_open |out|     connections << out   end end

according 1 of sinatra example files, chat.rb, makes chatroom, use 

out.callback    connections.delete(out) end

but in test, didn't fire when closed page test (in example, had puts console if code fired, , nothing outputted console).

is there more reliable way detect if user leaves stream?

also, i'm not using socket.io (client-side) or anything, i'm open if solves problem.

based on chat.rb example, create small protocol exchange data, instead of clean chat messages.

with approach, can send "alive signal" each connection , clean doesn't respond.

i adapted little chat.rb illustrate idea: https://gist.github.com/tlewin/5708745


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