概要
Rubyのrack-streamライブラリでStreaming APIを作成してみる。
環境
OS
Linux www4322gi 3.2.0-64-generic #97-Ubuntu SMP Wed Jun 4 22:04:21 UTC 2014 x86_64 x86_64 x86_64 GNU/LinuxRuby
rbenv(ruby version : ruby 1.9.3p547 (2014-05-14 revision 45962) [x86_64-linux])コード
基本的にはrack-streamのgithubにのっているソースコードをそのまま動かしただけの内容。Gemfile
rack-streamとWebサーバとしてthinを利用する。source 'https://rubygems.org' gem 'thin' gem 'rack-stream'
config.ru
# bundle exec thin start -R config.ru -p 9292
# config.ru
# run with `thin start -p 9292`
require 'rack/stream'
class App
include Rack::Stream::DSL
stream do
after_open do
count = 0
@timer = EM.add_periodic_timer(1) do
if count != 3
chunk "chunky #{count}\n"
count += 1
else
# Connection isn't closed until #close is called.
# Useful if you're building a firehose API
close
end
end
end
before_close do
@timer.cancel
chunk "monkey!\n"
end
[200, {'Content-Type' => 'text/plain'}, []]
end
end
app = Rack::Builder.app do
use Rack::Stream
run App.new
end
run app
実行結果
# Server $ bundle exec thin start -R config.ru -p 9292 Thin web server (v1.6.2 codename Doc Brown) Maximum connections set to 1024 Listening on 0.0.0.0:9292, CTRL+C to stop # Client curl http://localhost:9292 chunky 0 chunky 1 chunky 2 monkey!