Use a minimal app framework

Rakefile

@@ -1,8 +1,7 @@
-$: << 'lib'
-
-require 'fixer'
+require_relative 'config/environment'
 require 'rake/testtask'
-require 'db'
+require 'currency'
+require 'fixer'
 
 namespace :rates do
   desc 'Reload all rates'

config.ru

@@ -1,3 +1,3 @@
-$: << 'lib'
-require 'app'
+require './config/environment'
+require 'api'
 run Sinatra::Application

config/app.rb

@@ -0,0 +1,18 @@
+require 'logger'
+require 'pathname'
+
+module App
+  class << self
+    attr :logger
+
+    def env
+      ENV['RACK_ENV'] || 'development'
+    end
+
+    def root
+      Pathname.pwd
+    end
+  end
+
+  @logger = Logger.new(STDOUT)
+end

config/environment.rb

@@ -0,0 +1,3 @@
+require_relative 'app'
+$LOAD_PATH << App.root.join('lib')
+Dir[App.root.join('config/initializers/*.rb')].each { |f| require f }

config/initializers/sequel.rb

@@ -0,0 +1,5 @@
+require 'pg'
+require 'sequel'
+
+Sequel.single_threaded = true
+Sequel.connect(ENV['DATABASE_URL'] || "postgres://localhost/fixer_#{App.env}")

lib/currency.rb

@@ -1,7 +1,3 @@
-require 'sequel'
-
-Sequel.connect ENV['DATABASE_URL'] || 'postgres://localhost/fixer'
-
 class Currency < Sequel::Model
   def self.last_date
     order(:date).last.date

lib/snapshot.rb

@@ -1,5 +1,5 @@
 require 'virtus'
-require 'db'
+require 'currency'
 
 class Snapshot
   include Virtus

spec/api_spec.rb

@@ -1,8 +1,8 @@
 require_relative 'helper'
 require 'rack/test'
-require 'app'
+require 'api'
 
-describe 'the application' do
+describe 'the API' do
   include Rack::Test::Methods
 
   let(:app)  { Sinatra::Application }

spec/benchmark_spec.rb

@@ -1,6 +1,6 @@
 require_relative 'helper'
 require 'rack/test'
-require 'app'
+require 'server'
 
 if ENV['BENCH']
   describe 'benchmark the app' do

spec/helper.rb

@@ -1,3 +1,5 @@
+ENV['RACK_ENV'] = 'test'
+require './config/environment'
 require 'minitest/autorun'
 require 'minitest/benchmark' if ENV['BENCH']
 require 'minitest/pride'