[Wroc_Love.rb 2018] Cables! Cables! Cables!

Video: https://www.youtube.com/watch?v=AUxFFOehiy0

Links:
- http://anycable.io
- https://twitter.com/any_cable
- https://twitter.com/palkan_tula
- https://github.com/palkan/litecable
- http://www.plezi.io
- https://twitter.com/palkan_tula
- https://evilmartians.com/chronicles

Transcript

1. CABLES! CABLES!
   CABLES!
   Vladimir Dementyev
   

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2. Vladimir
   Dementyev
   

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3. ! Moscow
   
   # Wrocław
   

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4. @palkan
   @palkan_tula
   

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5. View Slide

6. EVIL MARTIANS
   

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7. EVIL MARTIANS
   

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8. View Slide

9. WHY I’M HERE
   

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10. THE TALK
    Action Cable pros & cons
    The tale of Action Cable
    Alternative cables for Rails and
    non-Rails
    

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11. CABLES
    Tools for building
    real-time applications
    Intro
    

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12. REAL-TIME
    Messaging (i.e. chats)
    Notifications
    Live updates
    Online games
    Other
    

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13. RUBY CABLES
    *based on https://www.ruby-toolbox.com/categories/HTTP_Pub_Sub
    

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14. RUBY CABLES
    

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15. © https://twitter.com/erneestoc/status/974485805770072064
    

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16. THE RED RUBY PILL?
    

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17. Part 1
    RailsConf 2015
    ACTION
    CABLE
    

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18. IN A NUTSHELL
    Server
    Client
    WebSocket
    Client
    WebSocket
    

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19. IN A NUTSHELL
    Server
    Client
    WebSocket
    Client
    WebSocket
    stream C
    Broadcaster
    stream B
    stream A
    stream B
    

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20. IN A NUTSHELL
    Server
    Client
    WebSocket
    Client
    WebSocket
    stream C
    Broadcaster
    stream B
    stream A
    stream B
    channel X
    channel Y
    channel Z
    

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21. PROS
    &
    CONS
    

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22. CABLE PROS
    Zero-configuration
    

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23. CABLE PROS
    Zero-configuration
    Channels framework
    

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24. CHANNELS
    class AnswersChannel < ApplicationCable ::Channel
    def subscribed
    reject_subscription unless current_user.admin?
    end
    def follow(params)
    stream_from "questions/ #{params['id']}"
    end
    end
    

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25. CABLE PROS
    Zero-configuration
    Channels framework
    JS client that just works
    

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26. CABLE CONS
    

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27. CABLE CONS
    Lack of transport fallbacks
    

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28. WEBSOCKETS
    http://caniuse.com/#search=websockets
    

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29. CABLE CONS
    Lack of transport fallbacks
    Memory usage
    

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30. MEMORY
    20k idle connections
    MB
    0
    200
    400
    600
    800
    1 000
    1 200
    1 400
    1 600
    Go Erlang Action Cable (8x)
    

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31. CABLE PROS
    Lack of transport fallbacks
    Memory usage
    Real-time performance
    

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32. SHOOTOUT
    https://hashrocket.com/blog/posts/websocket-shootout
    

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33. SHOOTOUT
    Client
    Server
    broadcast
    to all
    message
    send message back
    

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34. SHOOTOUT
    Broadcast RTT
    0,0s
    0,8s
    1,6s
    2,4s
    3,2s
    4,0s
    4,8s
    5,6s
    6,4s
    7,2s
    8,0s
    Number of connections
    1000 2000 3000 4000 5000 6000 7000 8000 9000 10000
    Go Erlang Action Cable (8x) Action Cable (2x)
    See https://github.com/anycable/anycable/tree/master/benchmarks
    

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35. View Slide

36. Action
    Cable
    Low
    Latency
    Crowded
    Channels
    CABLE
    THEOREM
    

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37. CABLE CONS
    Lack of transport fallbacks
    Memory usage
    Real-time performance
    CPU usage
    

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38. CPU
    

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39. CPU
    

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40. WHAT
    ABOUT
    REAL
    LIFE?
    I WANT TO
    BELIEVE IN
    BENCHMARKS
    

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41. Part 2
    THE
    TALE OF
    ACTION
    CABLE
    © http://www.equipe.com
    

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42. View Slide

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44. –Jon Stenqvist, CEO, Equipe
    “We've used all kind of
    push solutions over the
    years, the latest is faye,
    pusher, actioncable and X.”
    

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45. EQUIPE
    “With Action Cable, we could
    easily have 20+ 1GB dynos
    running during the weekends,
    with every growing memory”
    

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46. EQUIPE
    “After switching to X, we have 4
    512MB dynos, very stable at
    ~200MB memory usage”
    

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47. EQUIPE
    ActionCable: 20+ 2X (1GB) dynos X: 4 X (0.5GB) dynos
    

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48. EQUIPE
    ActionCable: 20+ 2X (1GB) dynos X: 4 X (0.5GB) dynos
    $1000 $100
    

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49. View Slide

50. X = AnyCable
    

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51. Part 3
    ANYCABLE
    

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52. ANYCABLE
    

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53. Client (protocol)
    Channels
    Streams
    Server
    ACTION CABLE
    

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54. Client (protocol)
    Channels
    Streams
    Server
    ACTION CABLE
    

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55. ACTION CABLE
    Client (protocol)
    Channels
    Streams
    Server
    ?
    

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56. ACTION CABLE
    Client (protocol)
    Channels
    Streams
    Server
    ANYCABLE
    

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57. gRPC
    https://grpc.io
    

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58. gRPC =
    Google RPC
    https://grpc.io
    

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59. gRPC =
    universal
    RPC
    framework
    https://grpc.io
    

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60. gRPC =
    HTTP/2 +
    protobuf
    https://grpc.io
    

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61. ANYCABLE
    Go WS
    

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63. ANYCABLE SERVERS
    anycable-go
    erlycable
    

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64. CPU
    anycable-go erlycable action_cable
    

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65. CPU
    anycable-go erlycable action_cable
    

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66. SHOOTOUT
    Broadcast RTT
    0,0s
    0,8s
    1,6s
    2,4s
    3,2s
    4,0s
    4,8s
    5,6s
    6,4s
    7,2s
    8,0s
    Number of connections
    1000 2000 3000 4000 5000 6000 7000 8000 9000 10000
    anycable-go erlycable Action Cable (8x)
    See https://github.com/anycable/anycable/tree/master/benchmarks
    

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67. PLUG-N-PLAY
    gem 'anycable-rails', group: :production
    rails generate anycable
    config.action_cable.url = ‘ws: //example.com:3334'
    ./bin/anycable # => Run RPC server
    brew install anycable/anycable/anycable-go
    anycable-go -p 3334 # => Run WebSocket server
    

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68. COMPATIBILITY
    Feature Status
    Connection Identifiers +
    Connection Request (cookies, params) +
    Disconnect Handling +
    Subscribe to channels +
    Parameterized subscriptions +
    Unsubscribe from channels +
    Subscription Instance Variables -
    Performing Channel Actions +
    Streaming +
    Remote Disconnect wip (planned for 0.6.0)
    Custom stream callbacks -
    Broadcasting +
    

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69. COMPATIBILITY
    https://medium.com/@leshchuk/from-action-to-any-1e8d863dd4cf
    

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70. MORE
    FEATURES
    

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71. MORE FEATURES
    Zero-disconnect deployment
    

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72. DISCONNECT
    Client Re-connect & Re-subscribe
    Client Disconnected ActionCable
    ActionCable
    

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73. DISCONNECT
    WebSocket Server
    Client Connected
    Client Connected App
    App
    RPC
    RPC
    

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74. DISCONNECT
    WebSocket Server
    App
    App
    gRPC
    App
    App
    App
    App
    Envoy Proxy
    * https://www.envoyproxy.io
    

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75. MORE FEATURES
    Zero-disconnect deployment
    Metrics & Stats
    

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76. METRICS
    

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77. http://anycable.io
    

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78. http://anycable.io
    

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79. github.com/anycable
    @any_cable
    ANYCABLE
    

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80. Part 4
    BEYOND
    RAILS
    © Призрачная Колыма
    

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81. NON-RAILS
    

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82. github.com/palkan/litecable
    LITE CABLE
    

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83. Rails-free Action Cable
    No deps (even ActiveSupport)
    Compatible with AnyCable
    Compatible with Action Cable clients
    LITE CABLE
    

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84. module Chat
    class Channel < LiteCable ::Channel ::Base
    identifier :chat
    def subscribed
    stream_from "chat_ #{chat_id}"
    end
    end
    end
    LITE CABLE
    

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85. run Rack ::Builder.new do
    map '/cable' do
    use LiteCable ::Server ::Middleware,
    connection_class: Chat ::Connection
    run proc { |_| [200, {}, ['']] }
    end
    end
    LITE CABLE
    

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86. HANAMI CABLE
    http://gabrielmalakias.com.br/ruby/hanami/iot/2017/05/26/websockets-connecting-litecable-to-hanami.html
    

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87. PLEZI CABLE
    

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88. PLEZI
    Iodine–fast concurrent web server for
    real-time Ruby applications
    Rack-compatible
    CPU efficient
    Less memory than Puma/Passenger
    Stable?
    

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89. plezi.io
    github.com/boazsegev/iodine
    PLEZI
    

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90. Outro
    RUBY
    OR NOT
    © RailsClub Moscow
    

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91. RUBY OR NOT
    WebSockets in Ruby are possible…
    

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92. RUBY OR NOT
    WebSockets in Ruby are possible…
    …but more efficient with the help of
    other languages
    

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93. ActionCable is usable…
    RUBY OR NOT
    

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94. ActionCable is usable…
    …and fixable/replaceable if
    necessary
    RUBY OR NOT
    

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95. DZIĘKUJĘ!
    Vladimir Dementyev
    anycable.io
    evilmartians.com
    @palkan
    @palkan_tula
    

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