docker: add cron service to compose file.

Gemfile

@@ -53,6 +53,7 @@ gem 'ed25519'
 gem 'bcrypt_pbkdf' # https://github.com/net-ssh/net-ssh/issues/565
 gem 'terminal-table'
 gem 'newrelic_rpm', require: false
+gem 'clockwork'
 
 group :production, :staging do
   gem 'unicorn', :platforms => :ruby

Gemfile.lock

@@ -145,6 +145,9 @@ GEM
       xpath (~> 3.2)
     childprocess (3.0.0)
     chronic (0.10.2)
+    clockwork (2.0.4)
+      activesupport
+      tzinfo
     codecov (0.5.2)
       simplecov (>= 0.15, < 0.22)
     coderay (1.1.3)
@@ -494,6 +497,7 @@ DEPENDENCIES
   capistrano-rbenv
   capistrano3-unicorn
   capybara
+  clockwork
   codecov
   daemons
   delayed_job

config/initializers/clockwork.rb

@@ -0,0 +1,22 @@
+# Define cronjobs using the clockwork gem; see https://github.com/Rykian/clockwork.
+# Use `bin/rails danbooru:cron` to start the cron process.
+#
+# See also `app/logical/danbooru_maintenance.rb`.
+
+module Clockwork
+  every(1.hour, "hourly", at: "**:00") do
+    DanbooruMaintenance.hourly
+  end
+
+  every(1.day, "daily", at: "00:00") do
+    DanbooruMaintenance.daily
+  end
+
+  every(1.week, "weekly", at: "Sunday 00:00") do
+    DanbooruMaintenance.weekly
+  end
+
+  every(1.month, "monthly", at: "00:00") do
+    DanbooruMaintenance.monthly
+  end
+end

docker-compose.yaml

@@ -21,7 +21,7 @@ version: "3.4"
 
 services:
   danbooru:
-    image: danbooru
+    image: evazion/danbooru
     ports:
       - "80:3000"
     environment:
@@ -36,15 +36,25 @@ services:
     command: ["bash", "-c", "bin/rails db:setup; bin/rails db:migrate && bin/rails server -b 0.0.0.0"]
     user: root
 
-  delayed_jobs:
-    image: danbooru
+  cron:
+    image: evazion/danbooru
     environment:
       - RAILS_ENV=production
       - DATABASE_URL=postgresql://danbooru@postgres/danbooru
       - DANBOORU_CANONICAL_URL=http://localhost
     depends_on:
       - danbooru
-    command: ["bash", "-c", "bin/wait-for-http http://danbooru:3000 3s && bin/delayed_job run"]
+    command: ["bash", "-c", "bin/wait-for-http http://danbooru:3000 5s && bin/rails danbooru:cron"]
+
+  delayed_jobs:
+    image: evazion/danbooru
+    environment:
+      - RAILS_ENV=production
+      - DATABASE_URL=postgresql://danbooru@postgres/danbooru
+      - DANBOORU_CANONICAL_URL=http://localhost
+    depends_on:
+      - danbooru
+    command: ["bash", "-c", "bin/wait-for-http http://danbooru:3000 5s && bin/delayed_job run"]
 
   postgres:
     image: evazion/postgres

lib/tasks/danbooru.rake

@@ -1,4 +1,9 @@
 namespace :danbooru do
+  desc "Run the cronjob scheduler"
+  task cron: :environment do
+    Clockwork::run
+  end
+
   namespace :docker do
     # Note that uncommited changes won't be included in the image; commit
     # changes first before building the image.