![APPLICATION 1
class App < Roda
plugin :streaming
plugin :basic_auth, authenticator: proc {|user, pass| [user, pass] == %w[client password]}
route do |r|
r.basic_auth {
stream do |out|
puts "streaming"
IO.popen("tail -f #{SYSTEM_LOG}") do |io|
io.each { |s|
out << s
}
end
end
}
end
end
run App.freeze.app](https://image.slidesharecdn.com/crystalisarubyistsfriendquickanecdote-161028171630/85/Crystal-is-a-Rubyists-friend-quick-anecdote-3-320.jpg)
Crystal is a Rubyists friend (quick anecdote)
- 1. CRYSTAL IS A RUBYISTS FRIEND (QUICK ANECDOTE) FORREST CHANG (OCRUBY) [email protected]
- 2. BEFORE WE START Which of the following caode samples is Ruby?
- 3. APPLICATION 1 class App < Roda plugin :streaming plugin :basic_auth, authenticator: proc {|user, pass| [user, pass] == %w[client password]} route do |r| r.basic_auth { stream do |out| puts "streaming" IO.popen("tail -f #{SYSTEM_LOG}") do |io| io.each { |s| out << s } end end } end end run App.freeze.app
- 4. APPLICATION 2 ws "/ws" do |socket| socket.on_message { |message| puts "Streaming #{SYSTEM_LOG}" if message == "TopSecret1234!" Process.run("tail", {"-f", SYSTEM_LOG} ) { |proc | proc.output.each_line { |line| socket.send line } } end } end Kemal.run
- 5. HARD TO TELL WHICH IS RUBY? That's the point The 2nd one is Crystal Easy/Comfortable for Rubyists A subset compiles for both language
- 6. BACKGROUND Wanted to stream syslog entries real time for visualization in browser based app Host machine, old, small - want a corresponding lightweight solution Wanted to try Roda Combined need (bullet 1) and desire (bullet 3)
- 7. RODA Small and light Uses a routing tree for routes (key distinguisher) Faster than Sinatra 15042.26 rps vs 4441.61 rps Reasons Why http://roda.jeremyevans.net/index.html https://github.com/luislavena/bench-micro#requestssec http://roda.jeremyevans.net/why.html
- 8. RODA EXPERIENCE Fairly easy to use (though routing tree is different) Supported streaming output pretty easily Maybe an hour plus to get running
- 9. PROBLEM Browser supports streaming output Javascript does not - D'oh! Need Server Side Events or Websockets for same effect Darn! Back to the drawing board
- 10. RODA WEBSOCKET SUPPORT Built in plugin (Roda designed for and heavily uses plugins) - Yay! Requires faye, Event Machine, mutexes – Hmm. Quick and small solution getting more complex and larger http://roda.jeremyevans.net/rdoc/classes/Roda/RodaPlugins/Websockets.htm
- 11. SO HOW ABOUT CRYSTAL? Want a framework vs writing raw calls Enter Kemal - "sinatra for Crystal" Crystal about as fast and as small as Golang But is a "statically typed, type inferenced Ruby that compiles to native code" So all the bene ts of Golang, with the Joy of Ruby http://kemalcr.com/
- 12. KEMAL SPEED 44X faster that Sinatra Framework Request Per Second Avg. Response Time Kemal (Production) 100238 0.395ms Sinatra (Thin) 2274 43.82ms
- 13. KEMAL WEBSOCKETS SUPPORT Built in Fast Thor is used to run the benchmark. thor -A 10000 Crystal (Kemal) CPU 1.85 Memory 11.2 MB Node.js (ws) CPU 38.95 Memory 906.3 MB This benchmark was performed on a 2013 Late Macbook Pro with 2Ghz i7 and 8G ram. P.S: Less is better http://localhost:3000/
- 14. One of the prime reasons people left Ruby for node was real time push (i.e. websockets), or performance/resources This shows Crystal exceeds node in all 3 of those, w/the joy of Ruby
- 15. KEMAL EXPERIENCE took about 15 min to get it working Kemal author @sdogruyol super responsive/helpful on gitter Since added functionality to that initial code Success! Got the job done, on to the app https://gitter.im/crystal-lang/crystal
- 16. SUMMARY Crystal easy/comfortable for Rubyists Fast and small Kemal instead of sinatra, roda, cuba, etc. For Rubyists, Crystal can be better t than Golang esp. if starting from scratch Community/Gitter active and helpful Be Happy and Productive