Sinatra: Up and Running by Alan Harris & Konstantin Haase

Author:Alan Harris & Konstantin Haase [Alan Harris]
Language: eng
Format: epub, pdf
Tags: COMPUTERS / Programming Languages / Ruby
ISBN: 9781449304225
Publisher: O'Reilly Media
Published: 2011-11-22T05:00:00+00:00

Keeping the Connection Open

There are a number of applications that lend themselves to a persistent, open connection. Perhaps you’re developing a chat program or something similar; Example 2-37 shows how to create this type of connection and broadcast messages to subscribers.

Example 2-37. A simple streaming example

require 'sinatra' before do content_type :txt end connections = [] get '/consume' do stream(:keep_open) do |out| # store connection for later on connections << out # remove connection when closed properly out.callback { connections.delete(out) } # remove connection when closed due to an error out.errback do logger.warn 'we just lost a connection!' connections.delete(out) end end end get '/broadcast/:message' do connections.each do |out| out << "#{Time.now} -> #{params[:message]}" << "\n" end "Sent #{params[:message]} to all clients." end

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