Dockerize app to move away from Heroku

.gitignore

@@ -1 +1,2 @@
 .bundle
+.env.local

Dockerfile

@@ -0,0 +1,18 @@
+# Use the Ruby 2.7.1 image from Docker Hub
+# as the base image (https://hub.docker.com/_/ruby)
+FROM ruby:2.7.2
+
+# Use a directory called /code in which to store
+# this application's files. (The directory name
+# is arbitrary and could have been anything.)
+WORKDIR /code
+
+# Copy all the application's files into the /code
+# directory.
+COPY . /code
+
+# Run bundle install to install the Ruby dependencies.
+RUN bundle install
+
+# Commmand to run when this container starts.
+CMD ["bundle", "exec", "puma", "-t", "5:5", "-p", "${PORT:-3000}", "-e", "${RACK_ENV:-development}"]

README.md

@@ -0,0 +1,4 @@
+To run migrations in docker:
+```
+docker run --rm -it --network=home_rev_proxy_default -v "$(pwd)/db:/db" --env "DATABASE_URL=postgres://hackinews@database/hackinews?sslmode=disable" amacneil/dbmate up
+```

docker-compose.yml

@@ -0,0 +1,111 @@
+# Use the file format compatible with Docker Compose 3.8
+version: "3.8"
+
+# Each thing that Docker Compose runs is referred to as
+# a "service". In our case, our Ruby application is one
+# service ("web") and our PostgreSQL database instance
+# is another service ("database").
+services:
+  database:
+    # Use the postgres 13.1 base image for this container.
+    image: postgres:13.1
+
+    networks:
+      - rev_proxy
+
+    volumes:
+      # We need to tell Docker where on the PostgreSQL
+      # container we want to keep the PostgreSQL data.
+      # In this case we're telling it to use a directory
+      # called /var/lib/postgresql/data, although it
+      # conceivably could have been something else.
+      #
+      # We're associating this directory with something
+      # called a volume. (You can see all your Docker
+      # volumes by running +docker volume ls+.) The name
+      # of our volume is db_data.
+      - db_data:/var/lib/postgresql/data
+
+      # This copies our init.sql into our container, to
+      # a special file called
+      # /docker-entrypoint-initdb.d/init.sql. Anything
+      # at this location will get executed one per
+      # container, i.e. it will get executed the first
+      # time the container is created but not again.
+      #
+      # The init.sql file is a one-line that creates a
+      # user called (arbitrarily) hackinews.
+      - ./init.sql:/docker-entrypoint-initdb.d/init.sql
+
+    deploy:
+      restart_policy:
+        condition: on-failure
+
+    environment:
+      POSTGRES_HOST_AUTH_METHOD: trust
+
+  web:
+    # The root directory from which we're building.
+    build: .
+
+    networks:
+      - rev_proxy
+
+    # This makes it so any code changes inside the project
+    # directory get synced with Docker. Without this line,
+    # we'd have to restart the container every time we
+    # changed a file.
+    volumes:
+      - .:/code:cached
+
+    # The command to be run when we run "docker-compose up".
+    command: bash -c "bundle exec puma -t 5:5 -p ${PORT:-3000} -e ${RACK_ENV:-development}"
+
+    # Expose port 3000.
+    ports:
+      - "3000:3000"
+
+    # Specify that this container depends on the other
+    # container which we've called "database".
+    depends_on:
+      - database
+
+    deploy:
+      restart_policy:
+        condition: on-failure
+
+    # Specify the values of the environment variables
+    # used in this container.
+    environment:
+      RACK_ENV: development
+      DATABASE_URL: postgres://hackinews@database/hackinews
+
+  worker:
+    build: .
+
+    networks:
+      - rev_proxy
+
+    volumes:
+      - .:/code:cached
+
+    command: bash -c "bundle exec ruby -r ./worker.rb -e \"loop { Worker.run }\""
+
+    depends_on:
+      - database
+
+    deploy:
+      restart_policy:
+        condition: on-failure
+
+    environment:
+      RACK_ENV: development
+      DATABASE_URL: postgres://hackinews@database/hackinews
+
+# Declare the volumes that our application uses.
+volumes:
+  db_data:
+
+networks:
+  rev_proxy:
+    name: home_rev_proxy_default

init.sql

@@ -0,0 +1 @@
+CREATE USER hackinews SUPERUSER;

lib/dotenv.rb

@@ -45,6 +45,4 @@ def replace_newline_character(string)
   end
 end
 
-if ENV['RACK_ENV'] == 'development' || ENV['RACK_ENV'] == 'test'
-  Dotenv.new.load %w[.env .env.local]
-end
+Dotenv.new.load %w[.env.local .env]

models/item.rb

@@ -57,7 +57,7 @@ def prefetch_children
   def truncated_url
     return unless data['url']
 
-    uri = URI.parse data['url'].delete('#%').encode(Encoding.find('ASCII'), { replace: '' })
+    uri = URI.parse data['url'].delete('#%').encode(Encoding.find('ASCII'), **{ replace: '' })
 
     uri.host.tap do |host|
       return host unless EXTENDED_TRUNCATION_DOMAINS.include? host