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ANYCABLE
Vladimir Dementyev
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Vladimir
Dementyev
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Vladimir
Dementyev
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Vladimir
Dementyev
John
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! Moscow
# Cyberjaya
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@palkan
@palkan_tula
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Rubyist
Rails Commiter
Ruby Commiter
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Rubyist
Rails Commiter
mRuby Commiter
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No content
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EVIL MARTIANS
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Let’s Go!
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ANYCABLE
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Part 1
RailsConf 2015
ACTION
CABLE
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ACTION CABLE
RailsConf 2015
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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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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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CABLE
HYPE
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CABLE HYPE
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PROS
&
CONS
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CABLE PROS
Easy configuration
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CABLE PROS
Easy configuration
Channels framework
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CABLE PROS
Easy configuration
Channels framework
JS client that just works
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CABLE CONS
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CABLE CONS
Lack of transport fallbacks
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WEBSOCKETS
http://caniuse.com/#search=websockets
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CABLE CONS
Lack of transport fallbacks
Memory usage
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MEMORY
20k idle connections
MB
0
375
750
1 125
1 500
1 875
2 250
2 625
3 000
Go Erlang Action Cable (2x) Action Cable (16x)
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CABLE PROS
Lack of transport fallbacks
Memory usage
Performance
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SHOOTOUT
https://hashrocket.com/blog/posts/websocket-shootout
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SHOOTOUT
Client
Server
broadcast
to all
message
send message back
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SHOOTOUT
Broadcast RTT
0s
1s
2s
3s
4s
5s
6s
7s
8s
9s
10s
Number of connections
1000 2000 3000 4000 5000 6000 7000 8000 9000 10000
Go Erlang Action Cable (2x) Action Cable (16x)
Running on AWS EC2 c3.4xlarge (16 vCPU, 30 GiB RAM)
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Action
Cable
Low
Latency
Crowded
Channels
CABLE
THEOREM
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CABLE CONS
Lack of transport fallbacks
Memory usage
Performance
CPU usage
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CPU
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IS
THERE
A WAY
OUT?
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LAZY WAY
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Part 2
ANYCABLE
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Client (protocol)
Channels
Streams
Server
ACTION CABLE
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Client (protocol)
Channels
Streams
Server
ACTION CABLE
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ACTION CABLE
Client (protocol)
Channels
Streams
Server
?
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INITIAL IDEA
?
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gRPC
https://grpc.io
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gRPC =
Google RPC
https://grpc.io
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gRPC =
universal
RPC
framework
https://grpc.io
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gRPC =
HTTP/2 +
protobuf
https://grpc.io
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https://grpc.io
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Erlang?
https://grpc.io
OOPS!
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ANYCABLE
Go WS
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ANYCABLE SERVERS
anycable-go
erlycable
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20k idle connections
MB
0
500
1 000
1 500
2 000
2 500
3 000
3 500
4 000
anycable-go erlycable Action Cable (16x)
MEMORY
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ANYCABLE-GO
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ERLYCABLE
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ACTION CABLE
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SHOOTOUT
Broadcast RTT
0s
1s
2s
3s
4s
5s
6s
7s
8s
9s
10s
Number of connections
1000 2000 3000 4000 5000 6000 7000 8000 9000 10000
anycable-go erlycable Action Cable (2x) Action Cable (16x)
Running on AWS EC2 c3.4xlarge (16 vCPU, 30 GiB RAM)
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HOW TO
gem 'anycable-rails', group: :production
rails generate anycable
./bin/anycable # => Run RPC server
brew install anycable/anycable/anycable-go
anycable-go -addr=0.0.0.0:3334
config.action_cable.url = 'ws: //0.0.0.0:3334'
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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 +
Custom stream callbacks -
Broadcasting +
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http://anycable.io
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github.com/anycable
@any_cable
ANYCABLE
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Part 3
BEYOND
RAILS
© Призрачная Колыма
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NON-RAILS
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Rails-free Action Cable
No deps (even ActiveSupport)
Compatible with AnyCable
Compatible with Action Cable JS
LITE CABLE
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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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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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HANAMI CABLE
http://gabrielmalakias.com.br/ruby/hanami/iot/2017/05/26/websockets-connecting-litecable-to-hanami.html
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github.com/palkan/litecable
LITE CABLE
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Part 4
FUTURE
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CABLE CONS
Lack of transport fallbacks
Memory & CPU usage
Performance
Consistency
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CABLE CONS
Lack of transport fallbacks
Memory & CPU usage
Performance
Consistency
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CONSISTENCY
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HISTORY STREAM
class ChatChannel < ApplicationCable ::Channel
def subscribed
stream_from "chat_ #{id}",
history: { time: 5.minutes }
end
end
class ChatChannel < ApplicationCable ::Channel
def subscribed
stream_from "chat_ #{chat_id}",
history: { size: 100 }
end
end
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MORE FEATURES
Disconnect-less deployment
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DISCONNECT
WebSocket Server
Client WebSocket
Client WebSocket App
App
RPC
RPC
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MORE FEATURES
Disconnect-less deployment
Data compression (MsgPack?)
Better instrumentation (WIP)
Sharing WebSocket server
between applications
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THANK
YOU!
anycable.io
evilmartians.com
@palkan
@palkan_tula
Vladimir Dementyev