Update rates in a separate thread in main app

.travis.yml

@@ -6,5 +6,5 @@ before_install:
 env:
   - RACK_ENV=test
 rvm:
-  - 2.4.2
+  - 2.5.0
 sudo: false

app/Dockerfile

@@ -1,4 +1,4 @@
-FROM ruby:2.4.2
+FROM ruby:2.5.0
 
 RUN mkdir /app
 WORKDIR /app
@@ -6,4 +6,4 @@ ADD Gemfile /app/Gemfile
 ADD Gemfile.lock /app/Gemfile.lock
 RUN bundle install --without development test
 ADD . /app
-CMD unicorn -c ./config/unicorn.rb
+CMD ["unicorn", "-c", "./config/unicorn.rb"]

app/bin/schedule

@@ -1,15 +0,0 @@
-#!/usr/bin/env ruby
-# frozen_string_literal: true
-
-require_relative '../config/environment'
-require 'rake'
-require 'rufus-scheduler'
-
-schedule = Rufus::Scheduler.new
-
-schedule.cron '*/15 15,16,17 * * 1-5' do
-  load 'tasks/rates.rake'
-  Rake::Task['rates:update'].execute
-end
-
-schedule.join

app/config.ru

@@ -2,5 +2,6 @@
 
 require './config/environment'
 require 'api'
+require 'schedule'
 
 run Sinatra::Application

app/lib/bank.rb

@@ -0,0 +1,22 @@
+# frozen_string_literal: true
+
+require 'currency'
+require 'fixer'
+
+module Bank
+  def self.fetch_all_rates!
+    Currency.db.transaction do
+      Currency.dataset.delete
+      data = Fixer.historical
+      Currency.multi_insert(data.to_a)
+    end
+  end
+
+  def self.fetch_current_rates!
+    Currency.db.transaction do
+      Fixer.current.each do |hsh|
+        Currency.find_or_create(hsh)
+      end
+    end
+  end
+end

app/lib/schedule.rb

@@ -0,0 +1,10 @@
+# frozen_string_literal: true
+
+require 'bank'
+require 'rufus-scheduler'
+
+schedule = Rufus::Scheduler.new
+
+schedule.cron '*/15 15,16,17 * * 1-5' do
+  Bank.fetch_current_rates!
+end

app/lib/tasks/rates.rake

@@ -1,25 +1,15 @@
 # frozen_string_literal: true
 
 namespace :rates do
-  desc 'Load all rates'
-  task load: :environment do
-    require 'currency'
-    require 'fixer'
-
-    Currency.db.transaction do
-      Currency.dataset.delete
-      data = Fixer::Feed.new(:historical)
-      Currency.multi_insert(data.to_a)
-    end
+  desc 'Reload all rates'
+  task reload: :environment do
+    require 'bank'
+    Bank.fetch_all_rates!
   end
 
-  desc 'Update rates'
+  desc 'Update current rates'
   task update: :environment do
-    require 'currency'
-    require 'fixer'
-
-    Fixer::Feed.new.each do |hsh|
-      Currency.find_or_create(hsh)
-    end
+    require 'bank'
+    Bank.fetch_current_rates!
   end
 end

app/lib/tasks/test.rake

@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-return unless ENV['RACK_ENV'] == 'test'
+return if ENV['RACK_ENV'] == 'production'
 
 require 'rake/testtask'
 require 'rubocop/rake_task'
@@ -13,4 +13,4 @@ end
 
 RuboCop::RakeTask.new
 
-task default: %w[db:migrate rates:load test rubocop]
+task default: %w[db:migrate rates:reload test rubocop]

app/spec/bank_spec.rb

@@ -0,0 +1,22 @@
+# frozen_string_literal: true
+
+require_relative 'helper'
+require 'bank'
+
+describe Bank do
+  around do |test|
+    Currency.db.transaction do
+      test.call
+      raise Sequel::Rollback
+    end
+  end
+
+  before do
+    Currency.dataset.delete
+  end
+
+  it 'fetches current rates' do
+    Bank.fetch_current_rates!
+    Currency.count.must_be :positive?
+  end
+end

docker-compose.override.yml

@@ -1,6 +1,8 @@
 version: '3'
 services:
   web:
+    build:
+      context: ./app
     environment:
       RACK_ENV: development
       VIRTUAL_HOST: localhost

docker-compose.prod.yml

@@ -1,16 +1,15 @@
 version: '3'
 services:
   db:
-    restart: always
+    restart: unless-stopped
   web:
     env_file: .env
+    image: hakanensari/fixer
     logging:
       options:
         max-size: "50m"
         max-file: "10"
-    restart: always
-  scheduler:
-    restart: always
+    restart: unless-stopped
   nginx-proxy:
     labels:
       - "com.github.jrcs.letsencrypt_nginx_proxy_companion.nginx_proxy=true"
@@ -21,7 +20,7 @@ services:
     ports:
       - "80:80"
       - "443:443"
-    restart: always
+    restart: unless-stopped
     volumes:
       - /etc/nginx/conf.d
       - ./limit_req.conf:/etc/nginx/conf.d/limit_req.conf:ro
@@ -32,7 +31,7 @@ services:
     image: jrcs/letsencrypt-nginx-proxy-companion
     depends_on:
       - nginx-proxy
-    restart: always
+    restart: unless-stopped
     volumes:
       - /var/run/docker.sock:/var/run/docker.sock:ro
       - certs:/etc/nginx/certs:rw

docker-compose.yml

@@ -5,8 +5,6 @@ services:
     volumes:
       - data:/var/lib/postgresql/data
   web:
-    build:
-      context: ./app
     command: unicorn -c config/unicorn.rb
     environment:
       DATABASE_URL: postgres://postgres@db/postgres
@@ -15,14 +13,6 @@ services:
       - '8080'
     links:
       - db
-  scheduler:
-    build:
-      context: ./app
-    command: bin/schedule
-    environment:
-      DATABASE_URL: postgres://postgres@db/postgres
-    links:
-      - db
   nginx-proxy:
     image: jwilder/nginx-proxy
     volumes: