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@[email protected] / @kkuchta x = "this is a micro service"

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@[email protected] / @kkuchta x = "this is a micro service"

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@[email protected] / @kkuchta x = "this is a micro service"

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@[email protected] / @kkuchta Microservices What do we know

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@[email protected] / @kkuchta Microservices What do we know A. Regular services, but smaller

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@[email protected] / @kkuchta Microservices What do we know A. Regular services, but smaller B. Better than services

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@[email protected] / @kkuchta Microservices What do we know A. Regular services, but smaller B. Better than services C. Smaller = better

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@[email protected] / @kkuchta Microservices What is the optimal size?

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@[email protected] / @kkuchta Microservices What is the optimal size? 1. Concept

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@[email protected] / @kkuchta Microservices What is the optimal size? 1. Concept 2. Model

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@[email protected] / @kkuchta Microservices What is the optimal size? 1. Concept 2. Model 3. Concern

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@[email protected] / @kkuchta Microservices What is the optimal size?

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@[email protected] / @kkuchta Microservices What is the optimal size?

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@[email protected] / @kkuchta x = SomeObject.new

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@[email protected] / @kkuchta Microservices Every goddamn object local.rb remote.rb

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@[email protected] / @kkuchta Microservices Every goddamn object class SomeClass def foo puts "hi" end end local.rb remote.rb

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@[email protected] / @kkuchta Microservices Every goddamn object class SomeClass def foo puts "hi" end end obj = SomeClass.new local.rb remote.rb

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@[email protected] / @kkuchta Microservices Every goddamn object class SomeClass def foo puts "hi" end end obj = SomeClass.new obj.foo local.rb remote.rb

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@[email protected] / @kkuchta Microservices Every goddamn object class SomeClass def foo puts "hi" end end obj = SomeClass.new obj.foo local.rb remote.rb # puts "hi" on remote server

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@[email protected] / @kkuchta Because Microservices

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@[email protected] / @kkuchta Microservices Every goddamn object class SomeClass def foo puts [1,2,3].map { puts "hi" } end end obj = SomeClass.new obj.foo local.rb remote.rb

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@[email protected] / @kkuchta Microservices Every goddamn object class SomeClass def foo puts [1,2,3].map { puts "hi" } end end obj = SomeClass.new obj.foo Remote local.rb remote.rb

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@[email protected] / @kkuchta Microservices Every goddamn object class SomeClass def foo puts [1,2,3].map { puts "hi" } end end obj = SomeClass.new obj.foo Remote Remote local.rb remote.rb

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@[email protected] / @kkuchta Microservices Every goddamn object class SomeClass def foo puts [1,2,3].map { puts "hi" } end end obj = SomeClass.new obj.foo Remote Remote Remote local.rb remote.rb

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@[email protected] / @kkuchta Microservices Every goddamn object class SomeClass def foo puts [1,2,3].map { puts "hi" } end end obj = SomeClass.new obj.foo Remote Remote Remote Remote local.rb remote.rb

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@[email protected] / @kkuchta Everything a Microservice Kevin Kuchta He/him Daybreak Health The worst possible intro to dRuby

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@[email protected] / @kkuchta Microservices Every goddamn object local.rb remote.rb class SomeClass def foo puts [1,2,3].map { puts "hi" } end end obj = SomeClass.new obj.foo Remote Remote Remote Remote

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@[email protected] / @kkuchta Remote Objects local.rb remote.rb foo = (something) output = foo.bar

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@[email protected] / @kkuchta Remote Objects local.rb remote.rb foo = (something) output = foo.bar # bar runs over here

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@[email protected] / @kkuchta dRuby

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@[email protected] / @kkuchta dRuby $ gem install drb

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@[email protected] / @kkuchta dRuby the good parts

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@[email protected] / @kkuchta dRuby the good parts local.rb

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@[email protected] / @kkuchta dRuby the good parts local.rb remote.rb

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@[email protected] / @kkuchta dRuby the good parts local.rb remote.rb require 'drb/drb'

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@[email protected] / @kkuchta dRuby the good parts local.rb remote.rb require 'drb/drb' class RemoteServer def foo; puts "foo ran here"; end end

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@[email protected] / @kkuchta dRuby the good parts local.rb remote.rb require 'drb/drb' class RemoteServer def foo; puts "foo ran here"; end end DRb.start_service(

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@[email protected] / @kkuchta dRuby the good parts local.rb remote.rb require 'drb/drb' class RemoteServer def foo; puts "foo ran here"; end end DRb.start_service( 'druby://localhost:5555',

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@[email protected] / @kkuchta dRuby the good parts local.rb remote.rb require 'drb/drb' class RemoteServer def foo; puts "foo ran here"; end end DRb.start_service( 'druby://localhost:5555', RemoteServer.new )

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@[email protected] / @kkuchta dRuby the good parts local.rb remote.rb require 'drb/drb' class RemoteServer def foo; puts "foo ran here"; end end DRb.start_service( 'druby://localhost:5555', RemoteServer.new ) DRb.thread.join

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@[email protected] / @kkuchta dRuby the good parts local.rb remote.rb require 'drb/drb' require 'drb/drb' class RemoteServer def foo; puts "foo ran here"; end end DRb.start_service( 'druby://localhost:5555', RemoteServer.new ) DRb.thread.join

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@[email protected] / @kkuchta dRuby the good parts local.rb remote.rb require 'drb/drb' remote = DRbObject.new_with_uri( require 'drb/drb' class RemoteServer def foo; puts "foo ran here"; end end DRb.start_service( 'druby://localhost:5555', RemoteServer.new ) DRb.thread.join

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@[email protected] / @kkuchta dRuby the good parts local.rb remote.rb require 'drb/drb' remote = DRbObject.new_with_uri( 'druby://localhost:5555' ) require 'drb/drb' class RemoteServer def foo; puts "foo ran here"; end end DRb.start_service( 'druby://localhost:5555', RemoteServer.new ) DRb.thread.join

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@[email protected] / @kkuchta dRuby the good parts local.rb remote.rb require 'drb/drb' remote = DRbObject.new_with_uri( 'druby://localhost:5555' ) remote.foo require 'drb/drb' class RemoteServer def foo; puts "foo ran here"; end end DRb.start_service( 'druby://localhost:5555', RemoteServer.new ) DRb.thread.join

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@[email protected] / @kkuchta dRuby the good parts local.rb remote.rb require 'drb/drb' remote = DRbObject.new_with_uri( 'druby://localhost:5555' ) remote.foo require 'drb/drb' class RemoteServer def foo; puts "foo ran here"; end end DRb.start_service( 'druby://localhost:5555', RemoteServer.new ) DRb.thread.join

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@[email protected] / @kkuchta dRuby the good parts local.rb remote.rb $ ruby remote.rb require 'drb/drb' remote = DRbObject.new_with_uri( 'druby://localhost:5555' ) remote.foo require 'drb/drb' class RemoteServer def foo; puts "foo ran here"; end end DRb.start_service( 'druby://localhost:5555', RemoteServer.new ) DRb.thread.join

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@[email protected] / @kkuchta dRuby the good parts local.rb remote.rb $ ruby local.rb $ ruby remote.rb require 'drb/drb' remote = DRbObject.new_with_uri( 'druby://localhost:5555' ) remote.foo require 'drb/drb' class RemoteServer def foo; puts "foo ran here"; end end DRb.start_service( 'druby://localhost:5555', RemoteServer.new ) DRb.thread.join

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@[email protected] / @kkuchta dRuby the good parts local.rb remote.rb $ ruby local.rb $ $ ruby remote.rb foo ran here require 'drb/drb' remote = DRbObject.new_with_uri( 'druby://localhost:5555' ) remote.foo require 'drb/drb' class RemoteServer def foo; puts "foo ran here"; end end DRb.start_service( 'druby://localhost:5555', RemoteServer.new ) DRb.thread.join

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@[email protected] / @kkuchta Creating Remote Objects automagic local.rb remote.rb class SomeClass def foo puts [1,2,3].map { puts "hi" } end end obj = SomeClass.new obj.foo

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@[email protected] / @kkuchta Remote Objects automagic local.rb remote.rb class SomeClass def foo; end end object = remote_new(SomeClass) object.foo

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@[email protected] / @kkuchta Remote Objects automagic *magic* local.rb remote.rb class SomeClass def foo; end end object = remote_new(SomeClass) object.foo

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@[email protected] / @kkuchta Remote Objects automatic local.rb remote.rb class RemoteNewer def make_new(klass) klass.new() end end DRb.start_service( 'druby://localhost:5555', RemoteNewer.new) class SomeClass # ... end object = remote_new(SomeClass)

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@[email protected] / @kkuchta Remote Objects automagic local.rb remote.rb class RemoteNewer def make_new(klass) klass.new() end end DRb.start_service( 'druby://localhost:5555', RemoteNewer.new) class SomeClass # ... end r = DRbObject.new_with_uri( 'druby://localhost:5555' ) r.make_new(SomeClass)

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@[email protected] / @kkuchta Remote Objects proxying local.rb remote.rb class RemoteObject def foo "bar" end end result = remote.foo

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@[email protected] / @kkuchta Remote Objects proxying local.rb remote.rb class RemoteObject def foo "bar" end end result = remote.foo result.class # string

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@[email protected] / @kkuchta Remote Objects proxying local.rb remote.rb class RemoteObject def foo SomethingWeird.new end end result = remote.foo

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@[email protected] / @kkuchta Remote Objects proxying local.rb remote.rb class RemoteObject def foo SomethingWeird.new end end result = remote.foo result.class # Drb::DrbObject

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@[email protected] / @kkuchta Remote Objects proxying local.rb remote.rb class RemoteObject def foo SomethingWeird.new end end result = remote.foo result.class # Drb::DrbObject result.something()

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@[email protected] / @kkuchta Remote Objects proxying local.rb remote.rb class RemoteObject def foo SomethingWeird.new end end result = remote.foo result.class # Drb::DrbObject result.something() # ^ proxies method call

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@[email protected] / @kkuchta Remote Objects proxying local.rb remote.rb class SomethingWeird include DRb::DRbUndumped end

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@[email protected] / @kkuchta Remote Objects proxying local.rb remote.rb class RemoteNewer def make_new(klass) klass.new() .extend(DRb::DRbUndumped) end end

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@[email protected] / @kkuchta Remote Objects proxying local.rb remote.rb class RemoteNewer def make_new(klass) klass.new() .extend(DRb::DRbUndumped) end end class SomeClass # ... end

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@[email protected] / @kkuchta Remote Objects proxying local.rb remote.rb class RemoteNewer def make_new(klass) klass.new() .extend(DRb::DRbUndumped) end end class SomeClass # ... end r = DRbObject.new_with_uri( 'druby://localhost:5555' )

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@[email protected] / @kkuchta Remote Objects proxying local.rb remote.rb class RemoteNewer def make_new(klass) klass.new() .extend(DRb::DRbUndumped) end end class SomeClass # ... end r = DRbObject.new_with_uri( 'druby://localhost:5555' ) obj = r.make_new(SomeClass)

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@[email protected] / @kkuchta Remote Objects proxying local.rb remote.rb class RemoteNewer def make_new(klass) klass.new() .extend(DRb::DRbUndumped) end end class SomeClass # ... end r = DRbObject.new_with_uri( 'druby://localhost:5555' ) obj = r.make_new(SomeClass) obj.class # DRb::DRbObject

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@[email protected] / @kkuchta Remote Objects proxying local.rb remote.rb class RemoteNewer def make_new(klass) klass.new() .extend(DRb::DRbUndumped) end end

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@[email protected] / @kkuchta Remote Objects new + newer local.rb remote.rb class RemoteNewer def make_new(klass, *rest, **kwargs, &block) obj = klass .new(*rest, **kwargs, &block) .extend(DRb::DRbUndumped) end end

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@[email protected] / @kkuchta Remote Objects local.rb remote.rb class RemoteNewer def make_new(klass, *rest, **kwargs, &block) obj = klass .new(*rest, **kwargs, &block) .extend(DRb::DRbUndumped) end end

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@[email protected] / @kkuchta Remote Objects putting it together local.rb remote.rb class RemoteNewer def make_new(klass, *rest, **kwargs, &block) obj = klass .new(*rest, **kwargs, &block) .extend(DRb::DRbUn dumped) end end

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@[email protected] / @kkuchta Remote Objects putting it together local.rb remote.rb class RemoteNewer def make_new(klass, *rest, **kwargs, &block) obj = klass .new(*rest, **kwargs, &block) .extend(DRb::DRbUn dumped) end end r = DRbObject.new_with_uri( 'druby://localhost:5555')

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@[email protected] / @kkuchta Remote Objects putting it together local.rb remote.rb class RemoteNewer def make_new(klass, *rest, **kwargs, &block) obj = klass .new(*rest, **kwargs, &block) .extend(DRb::DRbUn dumped) end end r = DRbObject.new_with_uri( 'druby://localhost:5555') remote_str = r.make_new( String, "123")

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@[email protected] / @kkuchta Remote Objects putting it together local.rb remote.rb class RemoteNewer def make_new(klass, *rest, **kwargs, &block) obj = klass .new(*rest, **kwargs, &block) .extend(DRb::DRbUn dumped) end end r = DRbObject.new_with_uri( 'druby://localhost:5555') remote_str = r.make_new( String, "123") remote_str.class # Drb::DrbObject

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@[email protected] / @kkuchta Remote Objects putting it together local.rb remote.rb class RemoteNewer def make_new(klass, *rest, **kwargs, &block) obj = klass .new(*rest, **kwargs, &block) .extend(DRb::DRbUn dumped) end end r = DRbObject.new_with_uri( 'druby://localhost:5555') remote_str = r.make_new( String, "123") remote_str.class # Drb::DrbObject remote_str.to_i

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@[email protected] / @kkuchta Logging Remote Objects it's login' time local.rb remote.rb module InvokeMethodWithLogging def perform result = super @msg_id && ( puts "remote: #{@msg_id}" ) result end end class DRb::DRbServer::InvokeMethod prepend InvokeMethodWithLogging end

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@[email protected] / @kkuchta Logging Remote Objects it's login' time local.rb remote.rb module InvokeMethodWithLogging def perform result = super @msg_id && ( puts "remote: #{@msg_id}" ) result end end class DRb::DRbServer::InvokeMethod prepend InvokeMethodWithLogging end

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@[email protected] / @kkuchta class RemoteNewer def make_new(klass, *rest, **kwargs, &block) obj = klass.new(*rest, **kwargs, &block).extend(DRb::DRbUnd umped) end end Remote Objects it's log-o-clock local.rb remote.rb r = DRbObject.new_with_uri( 'druby://localhost:5555') remote_str = r.make_new( String, "123") remote_str.class # Drb::DrbObject remote_str.to_i

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@[email protected] / @kkuchta class RemoteNewer def make_new(klass, *rest, **kwargs, &block) obj = klass.new(*rest, **kwargs, &block).extend(DRb::DRbUnd umped) end end Remote Objects it's log-o-clock local.rb remote.rb $ remote.rb r = DRbObject.new_with_uri( 'druby://localhost:5555') remote_str = r.make_new( String, "123") remote_str.class # Drb::DrbObject remote_str.to_i

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@[email protected] / @kkuchta class RemoteNewer def make_new(klass, *rest, **kwargs, &block) obj = klass.new(*rest, **kwargs, &block).extend(DRb::DRbUnd umped) end end Remote Objects it's log-o-clock local.rb remote.rb $ remote.rb remote: make_new r = DRbObject.new_with_uri( 'druby://localhost:5555') remote_str = r.make_new( String, "123") remote_str.class # Drb::DrbObject remote_str.to_i

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@[email protected] / @kkuchta class RemoteNewer def make_new(klass, *rest, **kwargs, &block) obj = klass.new(*rest, **kwargs, &block).extend(DRb::DRbUnd umped) end end Remote Objects it's log-o-clock local.rb remote.rb $ remote.rb remote: make_new remote: to_i r = DRbObject.new_with_uri( 'druby://localhost:5555') remote_str = r.make_new( String, "123") remote_str.class # Drb::DrbObject remote_str.to_i

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@[email protected] / @kkuchta Remote Objects Remote Object Everywhere local.rb remote.rb

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@[email protected] / @kkuchta Remote Objects Remote Object Everywhere local.rb remote.rb remote = DRbObject .new_with_uri('druby://localhost:5555')

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@[email protected] / @kkuchta Remote Objects Remote Object Everywhere local.rb remote.rb remote = DRbObject .new_with_uri('druby://localhost:5555') some_string = remote .make_new(String, "123")

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@[email protected] / @kkuchta Remote Objects Remote Object Everywhere local.rb remote.rb remote = DRbObject .new_with_uri('druby://localhost:5555') some_string = remote .make_new(String, "123") some_hash = remote .make_new(Hash)

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@[email protected] / @kkuchta Remote Objects Remote Object Everywhere local.rb remote.rb remote = DRbObject .new_with_uri('druby://localhost:5555') some_string = remote .make_new(String, "123") some_hash = remote .make_new(Hash) some_other = remote .make_new(Other, 'foo', 3)

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@[email protected] / @kkuchta Magic New what could go wrong? local.rb remote.rb class RemoteNewer def make_new(klass, *rest, **kwargs, &block) obj = klass.new(*rest, **kwargs, &block).extend(DRb::DRb Undumped) end end some_string = String.new("foo")

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@[email protected] / @kkuchta Magic New what could go wrong? local.rb remote.rb class RemoteNewer def make_new(klass, *rest, **kwargs, &block) obj = klass.new(*rest, **kwargs, &block).extend(DRb::DRb Undumped) end end some_string = String.new("foo") $r = DRbObject.new_with_uri( 'druby://localhost:5555') class Object def self.new(*args, **kwargs, &block) $r.remote_new( self, *args, **kwargs, &block) end end

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@[email protected] / @kkuchta Magic New what could go wrong? local.rb remote.rb class RemoteNewer def make_new(klass, *rest, **kwargs, &block) obj = klass.new(*rest, **kwargs, &block).extend(DRb::DRb Undumped) end end some_string = String.new("foo") $r = DRbObject.new_with_uri( 'druby://localhost:5555') class Object def self.new(*args, **kwargs, &block) $r.remote_new( self, *args, **kwargs, &block) end end

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@[email protected] / @kkuchta Magic New what could go wrong? local.rb remote.rb class RemoteNewer def make_new(klass, *rest, **kwargs, &block) obj = klass.new(*rest, **kwargs, &block).extend(DRb::DRb Undumped) end end some_string = String.new("foo") $r = DRbObject.new_with_uri( 'druby://localhost:5555') class Object def self.new(*args, **kwargs, &block) $r.remote_new( self, *args, **kwargs, &block) end end

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@[email protected] / @kkuchta Magic New what could go wrong? local.rb remote.rb class Object def self.new(*args, **kwargs, &block) contains_recursion = caller.any? { _1 =~ /(drb\/drb)/ } end end end

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@[email protected] / @kkuchta Magic New what could go wrong? local.rb remote.rb class Object @@old_new = method(:new) def self.new(*args, **kwargs, &block) contains_recursion = caller.any? { _1 =~ /(drb\/drb)/ } end end end

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@[email protected] / @kkuchta Magic New what could go wrong? local.rb remote.rb class Object @@old_new = method(:new) def self.new(*args, **kwargs, &block) contains_recursion = caller.any? { _1 =~ /(drb\/drb)/ } if contains_recursion @@old_new.unbind.bind(self)[*args, **kwargs, &block] end end end

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@[email protected] / @kkuchta Magic New what could go wrong? local.rb remote.rb class Object @@old_new = method(:new) def self.new(*args, **kwargs, &block) contains_recursion = caller.any? { _1 =~ /(drb\/drb)/ } if contains_recursion @@old_new.unbind.bind(self)[*args, **kwargs, &block] else $r.make_new(self, *args, **kwargs, &block) end end end

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@[email protected] / @kkuchta Magic New it works! local.rb remote.rb some_string = String.new("foo") some_string.to_i arr = Array.new([1,2,3]) sum = arr.sum

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@[email protected] / @kkuchta Magic New it works! local.rb remote.rb $ remote.rb remote: make_new remote: to_i remote: make_new remote: sum some_string = String.new("foo") some_string.to_i arr = Array.new([1,2,3]) sum = arr.sum

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@[email protected] / @kkuchta Microservices friggin' procs local.rb remote.rb

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@[email protected] / @kkuchta Microservices friggin' procs local.rb remote.rb arr = Array.new([1,2,3])

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@[email protected] / @kkuchta Microservices friggin' procs local.rb remote.rb arr = Array.new([1,2,3]) sum = arr.sum

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@[email protected] / @kkuchta Microservices friggin' procs local.rb remote.rb arr = Array.new([1,2,3]) sum = arr.sum arr.include?(2)

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@[email protected] / @kkuchta Microservices friggin' procs local.rb remote.rb arr = Array.new([1,2,3]) sum = arr.sum arr.include?(2) arr.join("foo")

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@[email protected] / @kkuchta Microservices friggin' procs local.rb remote.rb arr = Array.new([1,2,3]) sum = arr.sum arr.include?(2) arr.join("foo") arr.each { |i| puts i }

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@[email protected] / @kkuchta Microservices friggin' procs local.rb remote.rb arr = Array.new([1,2,3]) sum = arr.sum arr.include?(2) arr.join("foo") arr.each { |i| puts i }

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@[email protected] / @kkuchta Microservices friggin' procs local.rb remote.rb arr = Array.new([1,2,3]) sum = arr.sum arr.include?(2) arr.join("foo") arr.each { |i| puts i }

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@[email protected] / @kkuchta Microservices friggin' procs

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@[email protected] / @kkuchta Microservices friggin' procs some_remote_object.foo(arg1)

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@[email protected] / @kkuchta Microservices friggin' procs some_remote_object.foo(arg1) # Under the hood: Marshal.dump(arg1)

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@[email protected] / @kkuchta Microservices friggin' procs some_remote_object.foo(arg1) # Under the hood: Marshal.dump(arg1) some_remote_object.foo { |x| x + 1 }

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@[email protected] / @kkuchta Microservices friggin' procs some_remote_object.foo(arg1) # Under the hood: Marshal.dump(arg1) some_remote_object.foo { |x| x + 1 } # Under the hood: Marshal.dump(proc { |x| x + 1 })

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@[email protected] / @kkuchta Microservices friggin' procs > dumped = Marshal.dump({a: 1})

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@[email protected] / @kkuchta Microservices friggin' procs > dumped = Marshal.dump({a: 1}) => "\x04\b{\x06:\x06ai\x06"

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@[email protected] / @kkuchta Microservices friggin' procs > dumped = Marshal.dump({a: 1}) => "\x04\b{\x06:\x06ai\x06" > Marshal.load(dumped)

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@[email protected] / @kkuchta Microservices friggin' procs > dumped = Marshal.dump({a: 1}) => "\x04\b{\x06:\x06ai\x06" > Marshal.load(dumped) => {:a=>1}

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@[email protected] / @kkuchta Microservices friggin' procs

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@[email protected] / @kkuchta Microservices friggin' procs Marshal.dump(proc { |x| x + 1 })

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@[email protected] / @kkuchta Microservices friggin' procs Marshal.dump(proc { |x| x + 1 }) # TypeError: no _dump_data is # defined for class Proc

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@[email protected] / @kkuchta Microservices friggin' procs y = 3 Marshal.dump(proc { |x| x + y }) # TypeError: no _dump_data is # defined for class Proc

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@[email protected] / @kkuchta Microservices friggin' procs class Proc end

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@[email protected] / @kkuchta def _dump(depth) Microservices friggin' procs class Proc end

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@[email protected] / @kkuchta def _dump(depth) serialize_block(&self) end Microservices friggin' procs class Proc end

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@[email protected] / @kkuchta def _dump(depth) serialize_block(&self) end Microservices friggin' procs class Proc end "{ |x| x + 1 }"

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@[email protected] / @kkuchta def _dump(depth) serialize_block(&self) end def self._load(a_proc_string) Microservices friggin' procs class Proc end "{ |x| x + 1 }"

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@[email protected] / @kkuchta def _dump(depth) serialize_block(&self) end def self._load(a_proc_string) Microservices friggin' procs class Proc end "{ |x| x + 1 }"

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@[email protected] / @kkuchta def _dump(depth) serialize_block(&self) end def self._load(a_proc_string) eval('proc ' + a_proc_string) end Microservices friggin' procs class Proc end "{ |x| x + 1 }"

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@[email protected] / @kkuchta def _dump(depth) serialize_block(&self) end def self._load(a_proc_string) eval('proc ' + a_proc_string) end Microservices friggin' procs class Proc end "{ |x| x + 1 }" eval "proc { |x| x + 1 }"

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@[email protected] / @kkuchta Microservices friggin' procs 1. Find the source of a block

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@[email protected] / @kkuchta Microservices friggin' procs 1. Find the source of a block some_proc = proc do |x| x + 1 end

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@[email protected] / @kkuchta Microservices friggin' procs 1. Find the source of a block some_proc = proc do |x| x + 1 end some_proc.binding.source_location

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@[email protected] / @kkuchta Microservices friggin' procs 1. Find the source of a block some_proc = proc do |x| x + 1 end some_proc.binding.source_location # ["some_filename.rb", 1]

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@[email protected] / @kkuchta Microservices friggin' procs 1. Find the source of a block

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@[email protected] / @kkuchta Microservices friggin' procs 1. Find the source of a block require 'method_source'

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@[email protected] / @kkuchta Microservices friggin' procs 1. Find the source of a block require 'method_source' some_proc = proc do |x| x + 1 end

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@[email protected] / @kkuchta Microservices friggin' procs 1. Find the source of a block require 'method_source' some_proc = proc do |x| x + 1 end puts some_proc.source # "some_proc = proc do |x| # x + 1 # end"

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@[email protected] / @kkuchta Microservices friggin' procs 2. Parse out the actual block with SyntaxTree class BlockFinder < SyntaxTree::Visitor attr_reader :first_block visit_method def visit_do_block(node) @first_block ||= node end visit_method def visit_brace_block(node) @first_block ||= node end end def serialize_block(&block) source = block.source root = SyntaxTree.parse(source) visitor = BlockFinder.new visitor.visit(root) block_node = visitor.first_block formatter = SyntaxTree::Formatter.new(source, [], 80) formatter.instance_variable_set(:@stack, [proc {SyntaxTree::Program.new(statements: [], location: nil)}]) formatter.format(block_node) formatter.flush formatter.output.join end

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@[email protected] / @kkuchta Microservices friggin' procs 2. Parse out the actual block with the SyntaxTree gem "some_proc = proc { |x| x + 1 }"

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@[email protected] / @kkuchta Microservices friggin' procs 2. Parse out the actual block with the SyntaxTree gem = some_proc proc proc() {} |x| + x 1 "some_proc = proc { |x| x + 1 }"

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@[email protected] / @kkuchta Microservices friggin' procs 2. Parse out the actual block with the SyntaxTree gem = some_proc proc proc() {} |x| + x 1 "some_proc = proc { |x| x + 1 }"

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@[email protected] / @kkuchta Microservices friggin' procs 2. Parse out the actual block with the SyntaxTree gem = some_proc proc proc() {} |x| + x 1 "some_proc = proc { |x| x + 1 }"

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@[email protected] / @kkuchta Microservices friggin' procs 2. Parse out the actual block with the SyntaxTree gem = some_proc proc proc() {} |x| + x 1 "some_proc = proc { |x| x + 1 }"

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@[email protected] / @kkuchta Microservices friggin' procs 2. Parse out the actual block with the SyntaxTree gem = some_proc proc proc() {} |x| + x 1 "some_proc = proc { |x| x + 1 }"

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@[email protected] / @kkuchta Microservices friggin' procs 2. Parse out the actual block with the SyntaxTree gem = some_proc proc proc() {} |x| + x 1 "some_proc = proc { |x| x + 1 }"

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@[email protected] / @kkuchta Microservices friggin' procs 2. Parse out the actual block with the SyntaxTree gem = some_proc proc proc() {} |x| + x 1 "some_proc = proc { |x| x + 1 }"

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@[email protected] / @kkuchta Microservices friggin' procs 2. Parse out the actual block with the SyntaxTree gem = some_proc proc proc() {} |x| + x 1 "some_proc = proc { |x| x + 1 }" "{ |x| x + 1 }"

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@[email protected] / @kkuchta Microservices friggin' procs class Proc def _dump(depth) serialize_block(&self) end def self._load(a_proc_string) eval('proc ' + a_proc_string) end end

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@[email protected] / @kkuchta Microservices friggin' procs dumped = Marshal.dump(proc { |x| x + 1 }) class Proc def _dump(depth) serialize_block(&self) end def self._load(a_proc_string) eval('proc ' + a_proc_string) end end

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@[email protected] / @kkuchta Microservices friggin' procs dumped = Marshal.dump(proc { |x| x + 1 }) # "\x04\bIu:\tProc\x13 { |x| x + 1 }\x06:\x06ET" class Proc def _dump(depth) serialize_block(&self) end def self._load(a_proc_string) eval('proc ' + a_proc_string) end end

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@[email protected] / @kkuchta Microservices friggin' procs dumped = Marshal.dump(proc { |x| x + 1 }) # "\x04\bIu:\tProc\x13 { |x| x + 1 }\x06:\x06ET" reloaded_proc = Marshal.load(dumped) class Proc def _dump(depth) serialize_block(&self) end def self._load(a_proc_string) eval('proc ' + a_proc_string) end end

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@[email protected] / @kkuchta Microservices friggin' procs dumped = Marshal.dump(proc { |x| x + 1 }) # "\x04\bIu:\tProc\x13 { |x| x + 1 }\x06:\x06ET" reloaded_proc = Marshal.load(dumped) puts reloaded_proc[ 3 ] # prints 4! class Proc def _dump(depth) serialize_block(&self) end def self._load(a_proc_string) eval('proc ' + a_proc_string) end end

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@[email protected] / @kkuchta Microservices friggin' procs local.rb remote.rb arr = Array.new([1,2,3]) arr.each { |i| puts i }

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@[email protected] / @kkuchta Microservices friggin' procs local.rb remote.rb $ remote.rb remote: make_new 1 2 3 remote: each arr = Array.new([1,2,3]) arr.each { |i| puts i }

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@[email protected] / @kkuchta Microservices literally the worst arr = [1,2,3] str = "foo" hash = {a: 1, b: 2}

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@[email protected] / @kkuchta Microservices literally the worst class Array def self.new puts "new called" end end

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@[email protected] / @kkuchta Microservices literally the worst class Array def self.new puts "new called" end end Array.new # "new called"

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@[email protected] / @kkuchta Microservices literally the worst class Array def self.new puts "new called" end end Array.new # "new called" [1,2,3] # nothing

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@[email protected] / @kkuchta Microservices literally the worst x = [1,2,3] x = Array.new([1,2,3])

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@[email protected] / @kkuchta Microservices literally the worst DATA

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@[email protected] / @kkuchta Microservices literally the worst DATA

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@[email protected] / @kkuchta Microservices literally the worst puts "hi" puts DATA.read()

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@[email protected] / @kkuchta Microservices literally the worst puts "hi" puts DATA.read() __END__

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@[email protected] / @kkuchta Microservices literally the worst puts "hi" puts DATA.read() __END__ hello there, world, how are you?

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@[email protected] / @kkuchta Microservices literally the worst puts "hi" puts DATA.read() __END__ hello there, world, how are you? # prints: "hello there, world, how are you?"

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@[email protected] / @kkuchta Microservices literally the worst puts "hi" puts DATA.read() __END__ arr = [1,2,3]

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@[email protected] / @kkuchta Microservices literally the worst puts "hi" eval(DATA.read()) __END__ arr = [1,2,3]

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@[email protected] / @kkuchta Microservices literally the worst eval( DATA.read .gsub(/\[(.*)\]/, 'Array.new([\1])') ) __END__ arr = [1,2,3] # converts to Array.new([1,2,3])

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@[email protected] / @kkuchta Microservices literally the worst eval(DATA.read .gsub(/\[(.*)\]/, 'Array.new([\1])') .gsub(/{([^|]+:[^|]+)}/, 'Hash.new.merge!({\1})') .gsub(/"(.*)"/, 'String.new("\1")')) __END__ arr = [1,2,3] hash = {a: 1, b: 2} str = "whatever"

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@[email protected] / @kkuchta Peak Architecture less distributed

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@[email protected] / @kkuchta Peak Architecture more distributes

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@[email protected] / @kkuchta Peak Architecture more distributes

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@[email protected] / @kkuchta Peak Architecture more distributed def handler(event:, context:) x = event['x'] return x * 2 end

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@[email protected] / @kkuchta Peak Architecture more distributed def handler(event:, context:) # ... end

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@[email protected] / @kkuchta Peak Architecture more distributed def lambda_handler(event:, context:) DRb.start_service( "druby://localhost:5555", RemoteNewer.new ) DRb.thread.join end

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@[email protected] / @kkuchta Peak Architecture more distributed def lambda_handler(event:, context:) DRb.start_service( "druby://localhost:5555", RemoteNewer.new ) DRb.thread.join end

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@[email protected] / @kkuchta Peak Architecture more distributed def lambda_handler(event:, context:) DRb.start_service( "druby://localhost:5555", RemoteNewer.new ) DRb.thread.join end

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@[email protected] / @kkuchta Peak Architecture more distributed local.rb remote.rb class Object # ... def self.remote_new(*args, **kwargs, &block) end end

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@[email protected] / @kkuchta Peak Architecture more distributed local.rb remote.rb class Object # ... def self.remote_new(*args, **kwargs, &block) end end lambda_hostname = start_lambda()

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@[email protected] / @kkuchta Peak Architecture more distributed local.rb remote.rb class Object # ... def self.remote_new(*args, **kwargs, &block) end end lambda_hostname = start_lambda() sleep 3

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@[email protected] / @kkuchta Peak Architecture more distributed local.rb remote.rb class Object # ... def self.remote_new(*args, **kwargs, &block) end end lambda_hostname = start_lambda() sleep 3 uri = "druby://#{lambda_hostname}:5555"

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@[email protected] / @kkuchta Peak Architecture more distributed local.rb remote.rb class Object # ... def self.remote_new(*args, **kwargs, &block) end end lambda_hostname = start_lambda() sleep 3 uri = "druby://#{lambda_hostname}:5555" remote_newer = DRbObject.new_with_uri(uri)

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@[email protected] / @kkuchta Peak Architecture more distributed local.rb remote.rb class Object # ... def self.remote_new(*args, **kwargs, &block) end end lambda_hostname = start_lambda() sleep 3 uri = "druby://#{lambda_hostname}:5555" remote_newer = DRbObject.new_with_uri(uri) new_obj = remote_newer.make_new( self, *args, **kwargs, &block)

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@[email protected] / @kkuchta Peak Architecture more distributed local.rb remote.rb class Object # ... def self.remote_new(*args, **kwargs, &block) end end lambda_hostname = start_lambda() sleep 3 uri = "druby://#{lambda_hostname}:5555" remote_newer = DRbObject.new_with_uri(uri) new_obj = remote_newer.make_new( self, *args, **kwargs, &block) new_obj.instance_variable_set(:@uri, uri)

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@[email protected] / @kkuchta Peak Architecture more distributed local.rb remote.rb class Object # ... def self.remote_new(*args, **kwargs, &block) end end lambda_hostname = start_lambda() sleep 3 uri = "druby://#{lambda_hostname}:5555" remote_newer = DRbObject.new_with_uri(uri) new_obj = remote_newer.make_new( self, *args, **kwargs, &block) new_obj.instance_variable_set(:@uri, uri) new_obj

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@[email protected] / @kkuchta Peak Architecture more distributes

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@[email protected] / @kkuchta Peak Architecture more distributes

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@[email protected] / @kkuchta Microservices Every goddamn object local.rb remote.rb class SomeClass def foo puts [1,2,3].map { puts "hi" } end end obj = SomeClass.new obj.foo Remote Remote Remote Remote

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@[email protected] / @kkuchta Microservices Every goddamn object 1. Preprocess all literals with regexes into .new calls eval(DATA.read .gsub( /\[(.*)\]/, 'Array.new([\1])') .gsub( /{([^|]+:[^|]+)}/, 'Hash.new.merge!({\1})') .gsub( /"(.*)"/, 'String.new("\1")')) __END__ arr = [1,2,3] hash = {a: 1, b: 2} str = "whatever"

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@[email protected] / @kkuchta Microservices Every goddamn object 1. Preprocess all literals with regexes into .new calls 2. Overide Object.new 3. Inspect the call stack to prevent stack over f lows class Object @@old_new = method(:new) def self.new(*args, **kwargs, &block) contains_recursion = caller .any? { _1 =~ /(drb\/drb)/ } if contains_recursion @@old_new.unbind .bind(self)[*args, **kwargs, &block] else $r.make_new(self, *args, **kwargs, &block) end end end

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@[email protected] / @kkuchta Microservices Every goddamn object 1. Preprocess all literals with regexes into .new calls 2. Overide Object.new 3. Inspect the call stack to prevent stack over f lows 4. Use Druby to create remote proxy objects # local.rb uri = "druby://#{lambda_hostname}:5555" remote_newer = DRbObject.new_with_uri(uri) new_obj = remote_newer .make_new(self, *args, **kwargs, &block) # remote.rb DRb.start_service("druby://localhost:5555", RemoteRunner.new) DRb.thread.join

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@[email protected] / @kkuchta Microservices Every goddamn object 1. Preprocess all literals with regexes into .new calls 2. Overide Object.new 3. Inspect the call stack to prevent stack over f lows 4. Use Druby to create remote proxy objects 5. Parse the AST from your own source to serialize procs class Proc def _dump(depth) serialize_block(&self) end def self._load(a_proc_string) eval('proc ' + a_proc_string) end end

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@[email protected] / @kkuchta Microservices Every goddamn object 1. Preprocess all literals with regexes into .new calls 2. Overide Object.new 3. Inspect the call stack to prevent stack over f lows 4. Use Druby to create remote proxy objects 5. Parse the AST from your own source to serialize procs 6. Run the remote server in a lambda def lambda_handler(event:, context:) DRb.start_service( "druby://localhost:5555", RemoteRunner.new) DRb.thread.join end

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@[email protected] / @kkuchta Microservices Every goddamn object 1. Preprocess all literals with regexes into .new calls 2. Overide Object.new 3. Inspect the call stack to prevent stack over f lows 4. Use Druby to create remote proxy objects 5. Parse the AST from your own source to serialize procs 6. Run the remote server in a lambda 7. MICROSERVICES! def lambda_handler(event:, context:) DRb.start_service( "druby://localhost:5555", RemoteRunner.new) DRb.thread.join end

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@[email protected] / @kkuchta Microservices Every goddamn object class SomeClass def foo puts [1,2,3].map { puts "hi" } end end obj = SomeClass.new obj.foo local.rb remote.rb

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@[email protected] / @kkuchta Microservices Every goddamn object class SomeClass def foo puts [1,2,3].map { puts "hi" } end end obj = SomeClass.new obj.foo Remote local.rb remote.rb

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@[email protected] / @kkuchta Microservices Every goddamn object class SomeClass def foo puts [1,2,3].map { puts "hi" } end end obj = SomeClass.new obj.foo Remote Remote local.rb remote.rb

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@[email protected] / @kkuchta Microservices Every goddamn object class SomeClass def foo puts [1,2,3].map { puts "hi" } end end obj = SomeClass.new obj.foo Remote Remote Remote local.rb remote.rb

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@[email protected] / @kkuchta Microservices Every goddamn object class SomeClass def foo puts [1,2,3].map { puts "hi" } end end obj = SomeClass.new obj.foo Remote Remote Remote Remote local.rb remote.rb

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@[email protected] / @kkuchta # local.rb: arr = [1,2,3] str = "whatever" puts arr.map { |x| x * 2} str.each_char { |c| puts c }

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@[email protected] / @kkuchta $ time ruby local.rb > /dev/null 0.98s user 0.23s system 12% cpu 9.803 total # local.rb: arr = [1,2,3] str = "whatever" puts arr.map { |x| x * 2} str.each_char { |c| puts c }

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@[email protected] / @kkuchta Microservices Every goddamn object

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@[email protected] / @kkuchta Microservices Every goddamn object

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@[email protected] / @kkuchta Microservices Every goddamn object

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@[email protected] / @kkuchta slower, more expensive, complex

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@[email protected] / @kkuchta Microservices! slower, more expensive, complex

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@[email protected] / @kkuchta Microservices Every goddamn object Q&A class SomeClass def foo puts [1,2,3].map { puts "hi" } end end obj = SomeClass.new obj.foo Remote Remote Remote Remote

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@[email protected] / @kkuchta Microservices Every goddamn object FAQ class SomeClass def foo puts [1,2,3].map { puts "hi" } end end obj = SomeClass.new obj.foo Remote Remote Remote Remote

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@[email protected] / @kkuchta Microservices Every goddamn object Q: Should I use this in production? FAQ class SomeClass def foo puts [1,2,3].map { puts "hi" } end end obj = SomeClass.new obj.foo Remote Remote Remote Remote

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@[email protected] / @kkuchta Microservices Every goddamn object Q: Should I use this in production? A: De f initely! FAQ class SomeClass def foo puts [1,2,3].map { puts "hi" } end end obj = SomeClass.new obj.foo Remote Remote Remote Remote

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@[email protected] / @kkuchta Microservices Every goddamn object Q: Should I use this in production? A: De f initely! FAQ Q: What's a good use for druby for? class SomeClass def foo puts [1,2,3].map { puts "hi" } end end obj = SomeClass.new obj.foo Remote Remote Remote Remote

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@[email protected] / @kkuchta Microservices Every goddamn object Q: Should I use this in production? A: De f initely! FAQ Q: What's a good use for druby for? A: Smaller, internal projects class SomeClass def foo puts [1,2,3].map { puts "hi" } end end obj = SomeClass.new obj.foo Remote Remote Remote Remote

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@[email protected] / @kkuchta Microservices Every goddamn object Q: Where can I see this code in more detail? Q: Should I use this in production? A: De f initely! FAQ Q: What's a good use for druby for? A: Smaller, internal projects class SomeClass def foo puts [1,2,3].map { puts "hi" } end end obj = SomeClass.new obj.foo Remote Remote Remote Remote

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@[email protected] / @kkuchta Microservices Every goddamn object Q: Where can I see this code in more detail? A: github.com/kkuchta/druby Q: Should I use this in production? A: De f initely! FAQ Q: What's a good use for druby for? A: Smaller, internal projects class SomeClass def foo puts [1,2,3].map { puts "hi" } end end obj = SomeClass.new obj.foo Remote Remote Remote Remote

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@[email protected] / @kkuchta Microservices Every goddamn object Q: Who's responsible for this mess Q: Where can I see this code in more detail? A: github.com/kkuchta/druby Q: Should I use this in production? A: De f initely! FAQ Q: What's a good use for druby for? A: Smaller, internal projects class SomeClass def foo puts [1,2,3].map { puts "hi" } end end obj = SomeClass.new obj.foo Remote Remote Remote Remote

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@[email protected] / @kkuchta Microservices Every goddamn object Q: Who's responsible for this mess A: Kevin Kuchta, @kkuchta, kevinkuchta.com Q: Where can I see this code in more detail? A: github.com/kkuchta/druby Q: Should I use this in production? A: De f initely! FAQ Q: What's a good use for druby for? A: Smaller, internal projects class SomeClass def foo puts [1,2,3].map { puts "hi" } end end obj = SomeClass.new obj.foo Remote Remote Remote Remote

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@[email protected] / @kkuchta Microservices Every goddamn object Q: Who's responsible for this mess A: Kevin Kuchta, @kkuchta, kevinkuchta.com Q: Where can I see this code in more detail? A: github.com/kkuchta/druby Q: Should I use this in production? A: De f initely! Q: I have a real question FAQ Q: What's a good use for druby for? A: Smaller, internal projects class SomeClass def foo puts [1,2,3].map { puts "hi" } end end obj = SomeClass.new obj.foo Remote Remote Remote Remote

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@[email protected] / @kkuchta Microservices Every goddamn object Q: Who's responsible for this mess A: Kevin Kuchta, @kkuchta, kevinkuchta.com Q: Where can I see this code in more detail? A: github.com/kkuchta/druby Q: Should I use this in production? A: De f initely! Q: I have a real question A: Right here! FAQ Q: What's a good use for druby for? A: Smaller, internal projects class SomeClass def foo puts [1,2,3].map { puts "hi" } end end obj = SomeClass.new obj.foo Remote Remote Remote Remote

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@[email protected] / @kkuchta Microservices Every goddamn object Q: Who's responsible for this mess A: Kevin Kuchta, @kkuchta, kevinkuchta.com Q: Where can I see this code in more detail? A: github.com/kkuchta/druby Q: Should I use this in production? A: De f initely! Q: I have a real question A: Right here! Q: Who's paying you to do this nonsense FAQ Q: What's a good use for druby for? A: Smaller, internal projects class SomeClass def foo puts [1,2,3].map { puts "hi" } end end obj = SomeClass.new obj.foo Remote Remote Remote Remote

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@[email protected] / @kkuchta DaybreakHealth.com [email protected] https://daybreakhealth.applytojob.com/apply/

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@[email protected] / @kkuchta Thank You DaybreakHealth.com [email protected] https://daybreakhealth.applytojob.com/apply/

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@[email protected] / @kkuchta Credits - Poorly Drawn Lines comic - https://poorlydrawnlines.com/comic/an-idea/ - https://creativecommons.org/licenses/by-nc/3.0/