Switch to Roda

A first stab at replacing Sinatra with Roda

.rubocop_todo.yml

@@ -1,7 +1,7 @@
 Metrics/AbcSize:
   Max: 21.79
 Metrics/BlockLength:
-  ExcludedMethods: ['describe', 'helpers']
+  ExcludedMethods: ['describe', 'route']
 Metrics/MethodLength:
   Max: 13
 Minitest:

Gemfile

@@ -7,11 +7,12 @@ ruby '2.7.1'
 gem 'money'
 gem 'oj'
 gem 'ox'
+gem 'rack-contrib'
 gem 'rack-cors'
 gem 'rake'
+gem 'roda'
 gem 'rufus-scheduler'
 gem 'sequel_pg'
-gem 'sinatra'
 gem 'unicorn'
 
 group :test do

Gemfile.lock

@@ -25,8 +25,6 @@ GEM
       minitest (>= 4, < 6)
     money (6.13.7)
       i18n (>= 0.6.4, <= 2)
-    mustermann (1.1.1)
-      ruby2_keywords (~> 0.0.1)
     oj (3.10.6)
     ox (2.13.2)
     parallel (1.19.1)
@@ -36,16 +34,18 @@ GEM
     public_suffix (4.0.4)
     raabro (1.1.6)
     rack (2.2.2)
+    rack-contrib (2.2.0)
+      rack (~> 2.0)
     rack-cors (1.1.1)
       rack (>= 2.0.0)
-    rack-protection (2.0.8.1)
-      rack
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
     rainbow (3.0.0)
     raindrops (0.19.1)
     rake (13.0.1)
     rexml (3.2.4)
+    roda (3.31.0)
+      rack
     rubocop (0.82.0)
       jaro_winkler (~> 1.5.1)
       parallel (~> 1.10)
@@ -61,7 +61,6 @@ GEM
     rubocop-sequel (0.0.6)
       rubocop (~> 0.55, >= 0.55)
     ruby-progressbar (1.10.1)
-    ruby2_keywords (0.0.2)
     rufus-scheduler (3.6.0)
       fugit (~> 1.1, >= 1.1.6)
     safe_yaml (1.0.5)
@@ -73,12 +72,6 @@ GEM
       docile (~> 1.1)
       simplecov-html (~> 0.11)
     simplecov-html (0.12.2)
-    sinatra (2.0.8.1)
-      mustermann (~> 1.0)
-      rack (~> 2.0)
-      rack-protection (= 2.0.8.1)
-      tilt (~> 2.0)
-    tilt (2.0.10)
     tzinfo (2.0.2)
       concurrent-ruby (~> 1.0)
     unicode-display_width (1.7.0)
@@ -101,16 +94,17 @@ DEPENDENCIES
   money
   oj
   ox
+  rack-contrib
   rack-cors
   rack-test
   rake
+  roda
   rubocop-minitest
   rubocop-performance
   rubocop-sequel
   rufus-scheduler
   sequel_pg
   simplecov
-  sinatra
   unicorn
   vcr
   webmock

config.ru

@@ -3,4 +3,4 @@
 require './config/environment'
 require 'web/server'
 
-run Sinatra::Application
+run Web::Server.freeze.app

lib/web/server.rb

@@ -1,103 +1,93 @@
 # frozen_string_literal: true
 
 require 'oj'
+require 'rack/contrib/jsonp'
 require 'rack/cors'
-require 'sinatra'
+require 'roda'
 
 require 'currency_names'
 require 'query'
 require 'quote'
 
+module Web
+  class Server < Roda
     use Rack::Cors do
       allow do
         origins '*'
-    resource '*', headers: :any, methods: :get
+        resource '*', headers: :any, methods: %i[get options]
+      end
+    end
+    use Rack::JSONP
+
+    plugin :caching
+
+    plugin :error_handler do |_error|
+      request.halt [422, {}, nil]
+    end
+
+    plugin :indifferent_params
+
+    plugin :json, content_type: 'application/json; charset=utf-8',
+                  serializer: ->(o) { Oj.dump(o, mode: :compat) }
+
+    plugin :params_capturing
+
+    route do |r|
+      r.root do
+        { docs: 'https://www.frankfurter.app/docs' }
+      end
+
+      r.is(/latest|current/) do
+        r.params['date'] = Date.today.to_s
+        quote = quote_end_of_day(r)
+        r.etag quote.cache_key
+
+        quote.formatted
+      end
+
+      r.is(/(\d{4}-\d{2}-\d{2})/) do
+        r.params['date'] = r.params['captures'].first
+        quote = quote_end_of_day(r)
+        r.etag quote.cache_key
+
+        quote.formatted
+      end
+
+      r.is(/(\d{4}-\d{2}-\d{2})\.\.(\d{4}-\d{2}-\d{2})?/) do
+        r.params['start_date'] = r.params['captures'].first
+        r.params['end_date'] = r.params['captures'][1] || Date.today.to_s
+        quote = quote_interval(r)
+        r.etag quote.cache_key
+
+        quote.formatted
+      end
+
+      r.is 'currencies' do
+        currency_names = CurrencyNames.new
+        r.etag currency_names.cache_key
+
+        currency_names.formatted
       end
     end
 
-configure :development do
+    private
-  set :show_exceptions, :after_handler
-end
 
-configure :production do
+    def quote_end_of_day(request)
-  disable :dump_errors
+      query = Query.build(request.params)
-end
-
-configure :test do
-  set :raise_errors, false
-end
-
-set :static_cache_control, [:public, max_age: 300]
-
-helpers do
-  def end_of_day_quote
-    @end_of_day_quote ||= begin
-      query = Query.build(params)
       quote = Quote::EndOfDay.new(**query)
       quote.perform
-      halt 404 if quote.not_found?
+      request.halt [404, {}, nil] if quote.not_found?
 
       quote
     end
-  end
 
-  def interval_quote
+    def quote_interval(request)
-    @interval_quote ||= begin
+      query = Query.build(request.params)
-      query = Query.build(params)
       quote = Quote::Interval.new(**query)
       quote.perform
-      halt 404 if quote.not_found?
+      request.halt [404, {}, nil] if quote.not_found?
 
       quote
     end
   end
-
-  def json(data)
-    json = Oj.dump(data, mode: :compat)
-    callback = params['callback']
-
-    if callback
-      content_type :js, charset: Encoding::UTF_8
-      "#{callback}(#{json})"
-    else
-      content_type :json, charset: Encoding::UTF_8
-      json
-    end
-  end
-end
-
-get '/' do
-  json({ docs: 'https://www.frankfurter.app/docs' })
-end
-
-get '/(?:latest|current)', mustermann_opts: { type: :regexp } do
-  params[:date] = Date.today.to_s
-  etag end_of_day_quote.cache_key
-  json end_of_day_quote.formatted
-end
-
-get '/(?<date>\d{4}-\d{2}-\d{2})', mustermann_opts: { type: :regexp } do
-  etag end_of_day_quote.cache_key
-  json end_of_day_quote.formatted
-end
-
-get '/(?<start_date>\d{4}-\d{2}-\d{2})\.\.(?<end_date>\d{4}-\d{2}-\d{2})?',
-    mustermann_opts: { type: :regexp } do
-  @params[:end_date] ||= Date.today.to_s
-  etag interval_quote.cache_key
-  json interval_quote.formatted
-end
-
-get '/currencies' do
-  currency_names = CurrencyNames.new
-  etag currency_names.cache_key
-  json currency_names.formatted
-end
-
-not_found do
-  halt 404
-end
-
-error do
-  halt 422
 end

spec/edge_cases_spec.rb

@@ -7,7 +7,7 @@ require 'web/server'
 describe 'the server' do
   include Rack::Test::Methods
 
-  let(:app) { Sinatra::Application }
+  let(:app) { Web::Server.freeze }
 
   def json
     Oj.load(last_response.body)

spec/web/server_spec.rb

@@ -7,7 +7,7 @@ require 'web/server'
 describe 'the server' do
   include Rack::Test::Methods
 
-  let(:app)  { Sinatra::Application }
+  let(:app) { Web::Server.freeze }
   let(:json) { Oj.load(last_response.body) }
   let(:headers) { last_response.headers }
 
@@ -100,11 +100,11 @@ describe 'the server' do
 
   it 'handles JSONP' do
     get '/latest?callback=foo'
-    _(last_response.body).must_be :start_with?, 'foo'
+    _(last_response.body).must_be :start_with?, '/**/foo'
   end
 
-  it 'sets charset to UTF-8' do
+  it 'sets charset to utf-8' do
     get '/currencies'
-    _(last_response.headers['content-type']).must_be :end_with?, 'charset=UTF-8'
+    _(last_response.headers['content-type']).must_be :end_with?, 'charset=utf-8'
   end
 end