Add Whenever

Gemfile

@@ -40,6 +40,9 @@ gem "sanitize", "6.0.0"
 # Pagination
 gem "kaminari", "1.2.2"
 
+# Cron based periodical jobs
+gem "whenever", "1.0.0", require: false
+
 group :development, :test do
   # fake data for development and testing
   gem "faker", "3.1.0"

Gemfile.lock

@@ -93,6 +93,7 @@ GEM
       activesupport (>= 5.2)
       elasticsearch (>= 7.12.0, < 7.14.0)
       elasticsearch-dsl
+    chronic (0.10.2)
     concurrent-ruby (1.1.10)
     connection_pool (2.3.0)
     crass (1.0.6)
@@ -303,6 +304,8 @@ GEM
     websocket-driver (0.7.5)
       websocket-extensions (>= 0.1.0)
     websocket-extensions (0.1.5)
+    whenever (1.0.0)
+      chronic (>= 0.6.3)
     xpath (3.2.0)
       nokogiri (~> 1.8)
     zeitwerk (2.6.6)
@@ -333,6 +336,7 @@ DEPENDENCIES
   tzinfo-data
   web-console (= 4.2.0)
   webdrivers (= 5.2.0)
+  whenever (= 1.0.0)
 
 RUBY VERSION
    ruby 3.2.0p0

README.md

@@ -87,6 +87,11 @@ Since now if you have Ruby and Docker then you have working Rails environment in
     <td><b><a href="https://www.ruby-toolbox.com/categories/pagination">Kaminari</a></b></td>
     <td>Pagination solution</td>
   </tr>
+  <tr>
+    <td><img width="100px" alt="whenever" src="docs/whenever.png"></td>
+    <td><b><a href="https://www.ruby-toolbox.com/categories/scheduling">whenever</a></b></td>
+    <td>Linux Cron based periodical tasks</td>
+  </tr>
   </tbody>
 </table>
 
@@ -101,6 +106,11 @@ What I'm going to add...
     </tr>
   </thead>
   <tbody>
+  <tr>
+    <td><img width="100px" alt="letter_opener" src="docs/mailcatcher.png"></td>
+    <td><b><a href="https://www.ruby-toolbox.com/categories/EMail_Fake_Servers">mailcatcher</a></b></td>
+    <td>Email previwer for development</td>
+  </tr>
   <tr>
     <td><img width="100px" alt="devise" src="docs/devise.png"></td>
     <td><b><a href="https://www.ruby-toolbox.com/categories/rails_authentication">Devise</b></a></td>
@@ -116,16 +126,6 @@ What I'm going to add...
     <td><b>Devise and Action&nbsp;Mailer</b></td>
     <td>Sending emails for account confirmations</td>
   </tr>
-  <tr>
-    <td><img width="100px" alt="letter_opener" src="docs/mailcatcher.png"></td>
-    <td><b><a href="https://www.ruby-toolbox.com/categories/EMail_Fake_Servers">mailcatcher</a></b></td>
-    <td>Email previwer for development</td>
-  </tr>
-  <tr>
-    <td><img width="100px" alt="whenever" src="docs/whenever.png"></td>
-    <td><b><a href="https://www.ruby-toolbox.com/categories/scheduling">whenever</a></b></td>
-    <td>Linux Cron based periodical tasks</td>
-  </tr>
   <tr>
     <td><img width="100px" alt="rspec" src="docs/rspec.png"></td>
     <td><b><a href="https://www.ruby-toolbox.com/categories/testing_frameworks">RSpec</a></b></td>

app/models/currency_rate.rb

@@ -0,0 +1,27 @@
+# rails g model currency_rate
+#   from:string
+#   to:string
+#   rate:float
+
+# rails runner CurrencyRate.get
+# rails runner 'CurrencyRate.get("KGS", "USD")'
+# rails runner "CurrencyRate.get('USD', 'EUR')"
+
+class CurrencyRate < ApplicationRecord
+  API = "https://api.exchangerate.host/latest"
+
+  def self.get(from = "USD", to = "EUR")
+    uri = URI(CurrencyRate::API + "?base=#{from}&symbols=#{to}")
+
+    response = Net::HTTP.get(uri)
+    response_obj = JSON.parse(response)
+
+    create!(
+      from: from, to: to,
+      rate: response_obj['rates'][to]
+    )
+
+    puts "[#{DateTime.now.strftime('%d.%m.%Y %H.%M.%S')}]: " + \
+         "#{from}:#{to} currency rate: " + response_obj['rates'][to].to_s
+  end
+end

bin/exec

@@ -0,0 +1,5 @@
+#!/usr/bin/env ruby
+require_relative "./helpers.rb"
+
+to_exec = (ARGV[0] || 'containers_information').strip
+eval to_exec

bin/helpers.rb

@@ -1,4 +1,5 @@
 DELAY = 3
+ENV_NAME = ENV.fetch("RAILS_ENV") { 'development' }
 
 $steps_counter = 1
 $steps_messages = []
@@ -23,7 +24,7 @@ def system!(*args)
 end
 
 def container_exec(container_name = 'rails', cmd = 'ls')
-  to_exec = "docker compose -f docker/docker-compose.yml exec #{container_name} #{cmd}"
+  to_exec = "docker compose -f docker/docker-compose.yml exec -e='RAILS_ENV=#{ENV_NAME}' #{container_name} #{cmd}"
   puts to_exec
   system(to_exec)
 end
@@ -127,3 +128,23 @@ def sidekiq_stop
   puts "Stopping SIDEKIQ"
   container_bash_exec('rails', 'pkill -f sidekiq')
 end
+
+def cron_start
+  container_exec('--user root rails', '/etc/init.d/cron start')
+end
+
+def cron_stop
+  container_exec('--user root rails', '/etc/init.d/cron stop')
+end
+
+def whenever_start
+  container_exec('rails', "bundle exec whenever --update-crontab --load-file config/_SCHEDULE.rb -i lucky")
+end
+
+def whenever_show
+  container_exec('rails', 'crontab -l')
+end
+
+def whenever_stop
+  container_exec('rails', 'crontab -r')
+end

bin/start

@@ -1,13 +1,11 @@
 #!/usr/bin/env ruby
 require_relative "./helpers.rb"
 
-start_all_containers
 rails_install_gems
 rails_db_migrate
 
-puma_start
-sidekiq_start
-
+cron_start
 chewy_index
 
-containers_information
+sidekiq_start
+puma_start

bin/start_all

@@ -0,0 +1,6 @@
+#!/usr/bin/env ruby
+require_relative "./helpers.rb"
+
+start_all_containers
+system('bin/start')
+containers_information

bin/stop

@@ -2,6 +2,5 @@
 require_relative "./helpers.rb"
 
 puma_stop
+cron_stop
 sidekiq_stop
-
-containers_information

bin/stop_all

@@ -1,3 +1,4 @@
 #!/usr/bin/env ruby
 require_relative "./helpers.rb"
 stop_all_containers
+containers_information

config/_SCHEDULE.rb

@@ -0,0 +1,27 @@
+# Learn more: http://github.com/javan/whenever
+#
+# How to initialize whenever
+# `bundle exec wheneverize .`
+#
+# How to start cron service
+# as ROOT: /etc/init.d/cron start
+#
+# How to start whenever
+# whenever --update-crontab --load-file config/_SCHEDULE.rb -i lucky
+#
+# How to see current crontab
+# crontab -l
+
+env :GEM_HOME, ENV['GEM_HOME']
+set :environment, ENV.fetch("RAILS_ENV") { 'development' }
+
+set :output,  {
+  standard: '/home/lucky/app/log/cron.log',
+  error: '/home/lucky/app/log/cron.error.log'
+}
+
+job_type :rails, "cd :path && :environment_variable=:environment bundle exec rails :task :output"
+
+every 1.minute do
+  rails "runner \"CurrencyRate.get('USD', 'EUR')\""
+end

db/migrate/20230121113818_create_currency_rates.rb

@@ -0,0 +1,11 @@
+class CreateCurrencyRates < ActiveRecord::Migration[7.0]
+  def change
+    create_table :currency_rates do |t|
+      t.string :from
+      t.string :to
+      t.float :rate
+
+      t.timestamps
+    end
+  end
+end

docker/Dockerfile

@@ -21,6 +21,10 @@ FROM --platform=$BUILDPLATFORM ruby:3.2
 ARG BUILDPLATFORM
 RUN echo "$BUILDPLATFORM" > /BUILDPLATFORM
 
+RUN apt-get update && apt-get install --yes \
+    cron \
+    vim
+
 SHELL ["/bin/bash", "--login", "-c"]
 
 RUN gem update --system 3.4.2
@@ -48,7 +52,6 @@ RUN chown -R lucky:lucky /usr/local/bin/ruby
 RUN chown -R lucky:lucky /usr/local/bundle
 
 # rails credentials:edit
-RUN apt-get update && apt-get install vim --yes
 ENV EDITOR="vim"
 
 # =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

test/fixtures/currency_rates.yml

@@ -0,0 +1,11 @@
+# Read about fixtures at https://api.rubyonrails.org/classes/ActiveRecord/FixtureSet.html
+
+one:
+  from: MyString
+  to: MyString
+  rate: 1.5
+
+two:
+  from: MyString
+  to: MyString
+  rate: 1.5

test/models/currency_rate_test.rb

@@ -0,0 +1,7 @@
+require "test_helper"
+
+class CurrencyRateTest < ActiveSupport::TestCase
+  # test "the truth" do
+  #   assert true
+  # end
+end