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BUILDING Serverless RUBY BOTS

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NJUSKALO.HR

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# Gemfile gem 'httparty' gem 'oga' gem 'actionmailer' gem 'rake' gem 'whenever'

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Serverless

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AWS LAMBDA

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LANGUAGE SUPPORT JAVA, NODE.JS, PYTHON ...

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29 0CT 2015

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16 JAN 2018

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NO RUBY? :(

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TRAVELING Ruby MRuby JRuby

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TRAVELING RUBY

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MRUBY

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JRUBY

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SHRINK THE CODE BASE

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GEMFILE gem 'httparty' gem 'actionmailer' gem 'whenever' gem 'rake' gem 'oga'

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USE NET/HTTP gem 'httparty' gem 'actionmailer' gem 'whenever' gem 'rake' gem 'oga'

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USE NET/HTTP gem 'httparty' gem 'actionmailer' gem 'whenever' gem 'rake' gem 'oga'

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USE LAMBDA SCHEDULER gem 'httparty' gem 'actionmailer' gem 'whenever' gem 'rake' gem 'oga'

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    REGEX IT IS.

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    RUBY BOT CODE

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    # main.rb require 'net/http' require 'time' class NewApartments attr_reader :url def initialize(url) @url = url @last_scrapped_at = Time.now - 5 * 60 # 5 minutes ago. end def any? response_body .scan(/datetime\="(.*)" /) .any? { |published_at| Time.parse(published_at) > last_scrapped_at } end private def response_body Net::HTTP.get(URI(url)) end end

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    class MailgunEmailer def self.call Net::HTTP.post_form( URI("https://api:key-#{MAILGUN_API_KEY}@api.mailgun.net/v3/#{MAILGUN_DOMAIN}/messages"), from: "Apartment Bot ", to: RECIPIENT, subject: 'New Apartments found!', html: "Check new apartments" ) end end

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    SEARCH_URL = 'http://iapi.njuskalo.hr?sort=new&categoryId=10920&locationId=2619' MailgunEmailer.call if NewApartments.new(SEARCH_URL).any?

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    IMPLEMENTING THE BOT WITH Traveling Ruby PACKAGED MRI RUNTIMES

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    DOWNLOAD THE RUNTIMES OS X FOR OUR DEV MACHINE LINUX X86_64 COMPATIBLE BINARY FOR AWS LAMBDA

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    curl -O https://d6r77u77i8pq3.cloudfront.net/releases/traveling-ruby-20141215-2.1.5-linux-x86_64.tar.gz curl -O https://d6r77u77i8pq3.cloudfront.net/releases/traveling-ruby-20141215-2.1.5-osx.tar.gz

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    traveling-ruby-bot - ruby-linux-x86_64/ - ruby-os-x/

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    traveling-ruby-bot - ruby-linux-x86_64 - bin/ - ruby - ... - ... - ruby-os-x - bin/ - ruby - ... - ...

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    traveling-ruby-bot - ruby-linux-x86_64/ - ruby-os-x/ - main.rb

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    USUAL RUBY EXECUTION ruby main.rb

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    INVOKE WITH TRAVELING RUBY ruby-os-x/bin/ruby main.rb

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    UPLOADING THE BOT TO AWS Lambda

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    // lambda-function-wrapper.js var spawn = require('child_process').spawn; exports.handler = function(event, context) { var child = spawn('ruby-linux-x86_64/bin/ruby main.rb'); child.stdout.on('data', function (data) { console.log("stdout:\n"+data); }); child.stderr.on('data', function (data) { console.log("stderr:\n"+data); }); child.on('close', function (code) { context.done(); }); }

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    zip ruby-bot.zip ruby-linux-x86_64 main.rb lambda-function-wrapper.js

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    1. CREATE A FUNCTION

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    2. CREATE A TRIGGER

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    3. CREATE A RULE FOR THE TRIGGER

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    4. UPLOAD THE FUNCTION CODE

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    5. SET A HANDLER

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    IMPLEMENTING THE BOT WITH mruby

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    TWO WAYS TO BUILD APPS WITH MRUBY: - DOWNLOAD MRUBY SOURCE DIRECTLY FROM GITHUB - MRUBY-CLI - PLATFORM FOR BUILDING NATIVE COMMAND LINE APPLICATIONS FOR LINUX, WINDOWS, AND OS X.

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    BUILDING DIRECTLY FROM MRUBY SOURCE

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    git clone https://github.com/mruby/mruby

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    mruby-bot - bin - build_config.rb - minirake

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    ./MINIRAKE

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    mruby-bot - bin/ - mruby - mirb - build_config.rb - minirake

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    > echo "print 'hello world'" >> hello_world.rb

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    INVOKE WITH MRUBY bin/mruby hello_world.rb

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    > bin/mruby main.rb main.rb:1: undefined method 'require' for main (NoMethodError)

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    # build_config.rb conf.gem github: 'iij/mruby-env' conf.gem github: 'mattn/mruby-curl' conf.gem github: 'mattn/mruby-onig-regexp'

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    ./MINIRAKE

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    EXECUTE THE CODE bin/mruby main.rb

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    CROSS COMPILATION

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    IMPLEMENTING THE BOT WITH JRUBY

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    AWS LAMBDA JRUBY

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    jruby-bot - lib/ - jruby.jar - src/ - main/ - resources/ - main.rb - gradlew

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    PASTE CODE mv main.rb src/main/resources/main.rb

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    BUILD THE PROJECT ./gradlew build

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    UPLOAD THE BOT CODE

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    METRICS & NUMBERS

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    CODE SIZE Traveling Ruby 6.7 MB mruby 945 kB JRuby 24 MB

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    MEMORY CONSUMPTION Traveling Ruby 25 MB mruby 40 MB JRuby 150 MB

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    EXECUTION TIME (COLD START) Traveling Ruby ~3900 ms mruby ~3900 ms JRuby ~25000 ms

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    COLDSTARTS

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    EXECUTION TIME (WARMED UP) Traveling Ruby ~3300 ms mruby ~3300 ms JRuby ~1200 ms

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    YMMV

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    AWS LAMBDA PRICING

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    AWS LAMBDA PRICING THE NUMBER OF REQUESTS (I.E. NUMBER OF TIMES OUR FUNCTION IS INVOKED) THE SUM OF DURATIONS OUR FUNCTIONS TOOK TO EXECUTE (EXPRESSED IN GB-SECONDS)

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    FREE TIER 1M REQUESTS & 400,000 GB-SECONDS PER MONTH

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    1M TIMES PER MONTH ROUGLY EVERY 3 SECONDS

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    400,000 GB-SECONDS / MONTH MEMORY SIZE * DURATION IN SECONDS

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    e.g. 128MB * 4s = 0.5GB-secons

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    IF WE RAN THE BOT EVERY MINUTE 20.000 GB-SECONDS

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    CHOOSING THE RIGHT Ruby FOR THE JOB

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    Traveling Ruby LOW MEMORY CONSUMPTION / WELL KNOWN ENVIRONMENT SUPPORT?

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    MRuby LOW MEMORY CONSUMPTION / LIGHTWEIGHT LIBRARY SUPPORT / CROSS COMPILATION

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    JRuby SIMPLE PACKAGING* / FAST EXECUTION HIGH MEMORY CONSUMPTION / JAVA ERRORS

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    Alternatives

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    RUBY Packer RUBY Snap

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    Azure FUNCTIONS Google Cloud FUNCTIONS

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    Lots of OPTIONS

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    Hacky OPTIONS

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    ..A MONTH AGO..

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    APACHE OpenWhisk

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    IBM Cloud Functions

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    IBM Cloud Functions

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    Inline editor

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    Serverless Framework SUPPORT

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    serverless create --template openwhisk-ruby --path ruby_bot

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    - ruby_bot - handler.rb - serverless.yml

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    # serverless.yml service: ruby_bot provider: name: openwhisk runtime: ruby functions: ruby_bot: handler: handler.main plugins: - serverless-openwhisk

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    serverless deploy

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    JETS SERVERLESS FRAMEWORK FOR RUBY

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    Jets.application.routes.draw do get 'posts', to: 'posts#index' end class PostsController < ApplicationController def index render json: { hello: 'world', action: 'index' } end end

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    FaastRuby.io

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    Conclusion

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    SERVERLESS-RUBY.ORG

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    DAMIR SVRTAN

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    tinyurl.com/netflix-ruby

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    DAMIR SVRTAN SENIOR SOFTWARE ENGINEER @ Netflix HIT ME UP @DamirSvrtan TINYURL.COM/NETFLIX-RUBY