Add the demo_web_app source code and Dockerfile

[refs #cd23f1c7be00]

Author: jfahrer

demo_web_app/Dockerfile

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+FROM ruby:2.4.2
+
+RUN apt-get update && apt-get install -y postgresql-client
+
+WORKDIR /tmp
+COPY Gemfile* ./
+RUN bundle install
+
+WORKDIR /app
+COPY . .
+
+ENV POSTGRES_HOST=localhost POSTGRES_DB=web_app POSTGRES_USER=web_app POSTGRES_PASSWORD=
+ARG WAIT_FOR_POSTGRES=false
+ENV WAIT_FOR_POSTGRES=$WAIT_FOR_POSTGRES
+EXPOSE 9292
+
+CMD ["./start.sh"]

demo_web_app/Gemfile

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+source 'https://rubygems.org'
+
+gem 'activerecord'
+gem 'pg'
+gem 'rake'
+gem 'sinatra'
+gem 'sinatra-activerecord', '~> 2.0'

demo_web_app/Gemfile.lock

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+GEM
+  remote: https://rubygems.org/
+  specs:
+    activemodel (5.1.4)
+      activesupport (= 5.1.4)
+    activerecord (5.1.4)
+      activemodel (= 5.1.4)
+      activesupport (= 5.1.4)
+      arel (~> 8.0)
+    activesupport (5.1.4)
+      concurrent-ruby (~> 1.0, >= 1.0.2)
+      i18n (~> 0.7)
+      minitest (~> 5.1)
+      tzinfo (~> 1.1)
+    arel (8.0.0)
+    concurrent-ruby (1.0.5)
+    i18n (0.9.1)
+      concurrent-ruby (~> 1.0)
+    minitest (5.10.3)
+    mustermann (1.0.1)
+    pg (0.21.0)
+    rack (2.0.3)
+    rack-protection (2.0.0)
+      rack
+    rake (12.3.0)
+    sinatra (2.0.0)
+      mustermann (~> 1.0)
+      rack (~> 2.0)
+      rack-protection (= 2.0.0)
+      tilt (~> 2.0)
+    sinatra-activerecord (2.0.13)
+      activerecord (>= 3.2)
+      sinatra (>= 1.0)
+    thread_safe (0.3.6)
+    tilt (2.0.8)
+    tzinfo (1.2.4)
+      thread_safe (~> 0.1)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  activerecord
+  pg
+  rake
+  sinatra
+  sinatra-activerecord (~> 2.0)
+
+BUNDLED WITH
+   1.15.4

demo_web_app/Rakefile

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+require 'sinatra/activerecord'
+require 'sinatra/activerecord/rake'
+require './app'

demo_web_app/app.rb

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+require 'sinatra'
+require 'sinatra/activerecord'
+require 'sinatra/activerecord/rake'
+require 'erb'
+require './models/request'
+
+set :database, {
+  adapter: 'postgresql',
+  encoding: 'unicode',
+  pool: 2,
+  host: ENV['POSTGRES_HOST'],
+  database: ENV['POSTGRES_DB'],
+  username: ENV['POSTGRES_USER'],
+  password: ENV['POSTGRES_PASSWORD'],
+}
+set :raise_errors, true
+
+class App < Sinatra::Base
+  get '/' do
+    Request.create!(ip: request.ip, host: Socket.gethostname, path: request.path, timestamp: Time.now)
+    erb :index, locals: { requests: Request.all.order(timestamp: :desc).limit(25) }
+  end
+end

demo_web_app/config.ru

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+require 'rubygems'
+require 'bundler'
+
+Bundler.require
+
+require './app'
+run App

demo_web_app/db/migrate/20171128082428_create_requests.rb

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+class CreateRequests < ActiveRecord::Migration[5.1]
+  def change
+    create_table :requests do |t|
+      t.timestamp :timestamp
+      t.string :ip
+      t.string :host
+      t.string :path
+    end
+  end
+end

demo_web_app/db/schema.rb

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+# This file is auto-generated from the current state of the database. Instead
+# of editing this file, please use the migrations feature of Active Record to
+# incrementally modify your database, and then regenerate this schema definition.
+#
+# Note that this schema.rb definition is the authoritative source for your
+# database schema. If you need to create the application database on another
+# system, you should be using db:schema:load, not running all the migrations
+# from scratch. The latter is a flawed and unsustainable approach (the more migrations
+# you'll amass, the slower it'll run and the greater likelihood for issues).
+#
+# It's strongly recommended that you check this file into your version control system.
+
+ActiveRecord::Schema.define(version: 20171128082428) do
+
+  # These are extensions that must be enabled in order to support this database
+  enable_extension "plpgsql"
+
+  create_table "requests", force: :cascade do |t|
+    t.datetime "timestamp"
+    t.string "ip"
+    t.string "host"
+    t.string "path"
+  end
+
+end

demo_web_app/docker-compose.yml

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+version: '3'
+
+services:
+  app:
+    image: jfahrer/demo_web_app:latest
+    build:
+      context: .
+    volumes:
+      - ./:/app
+    environment:
+      POSTGRES_HOST: pg
+      POSTGRES_DB: web_app_db
+      POSTGRES_USER: web_app
+      POSTGRES_PASSWORD: secret
+    ports:
+      - 9292:9292
+
+  wait_for:
+    image: jfahrer/demo_web_app:wait_for_pg
+    build:
+      context: .
+      args:
+        - WAIT_FOR_POSTGRES=true
+    environment:
+      POSTGRES_HOST: pg
+      POSTGRES_DB: web_app_db
+      POSTGRES_USER: web_app
+      POSTGRES_PASSWORD: secret
+
+  pg:
+    image: postgres:9.6.6-alpine
+    environment:
+      POSTGRES_DB: web_app_db
+      POSTGRES_USER: web_app
+      POSTGRES_PASSWORD: secret

demo_web_app/models/request.rb

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+class Request < ActiveRecord::Base
+
+end