How to Host a Ruby Application on Vertra Cloud

my-app-ruby/
├── app.rb
├── Gemfile
├── Gemfile.lock
└── vertracloud.config

source 'https://rubygems.org'

ruby '3.3.0'

gem 'sinatra', '~> 3.0'
gem 'rack', '~> 2.2'
gem 'pry', '~> 0.14'
gem 'pg', '~> 1.5'  # For PostgreSQL
gem 'json', '~> 2.6'

group :development do
  gem 'rerun', '~> 1.14'
end

MAIN=app.rb
START=bundle exec ruby app.rb -p $PORT -o 0.0.0.0
VERSION=recommended

require 'sinatra'
require 'json'
require 'pg'

set :bind, '0.0.0.0'
set :port, ENV['PORT'] || 80

# Database configuration
def get_db_connection
  begin
    PG.connect(
      host: ENV['DB_HOST'] || 'localhost',
      dbname: ENV['DB_NAME'] || 'vertracloud',
      user: ENV['DB_USER'] || 'vertracloud',
      password: ENV['DB_PASSWORD'] || '',
      port: ENV['DB_PORT'] || 5432
    )
  rescue PG::Error => e
    puts "Database connection error: #{e.message}"
    nil
  end
end

before do
  content_type :json
end

# Root route
get '/' do
  {
    message: 'Ruby Sinatra API on Vertra Cloud',
    version: '1.0.0'
  }.to_json
end

# Health check
get '/health' do
  {
    status: 'healthy',
    service: 'ruby-api',
    uptime: Time.now.to_i
  }.to_json
end

# List items
get '/api/items' do
  conn = get_db_connection
  return { error: 'Database connection failed' }.to_json if conn.nil?

  begin
    result = conn.exec('SELECT id, name, description FROM items LIMIT 20')
    items = result.map do |row|
      {
        id: row['id'].to_i,
        name: row['name'],
        description: row['description']
      }
    end
    items.to_json
  rescue PG::Error => e
    { error: e.message }.to_json
  ensure
    conn.close if conn
  end
end

# Error handling
error do
  status 500
  { error: 'Internal server error' }.to_json
end

not_found do
  status 404
  { error: 'Not found' }.to_json
end

puts "Server starting on #{settings.bind}:#{settings.port}"