Drop caching

.travis.yml

@@ -2,6 +2,4 @@ before_script:
   - psql -c 'create database fixer_test;' -U postgres
 rvm:
   - 2.4.0
-services:
-  - memcached
 sudo: false

Dockerfile

@@ -6,4 +6,4 @@ ADD Gemfile /app/Gemfile
 ADD Gemfile.lock /app/Gemfile.lock
 RUN bundle install --without development test
 ADD . /app
-CMD ./wait-for-it.sh db:5432 -s -- wait-for-it.sh memcache:11211 -s -- unicorn -c /app/config/unicorn.rb
+CMD ./wait-for-it.sh db:5432 -s -- unicorn -c /app/config/unicorn.rb

Gemfile

@@ -3,12 +3,10 @@ source 'http://rubygems.org'
 
 ruby '2.4.0'
 
-gem 'dalli'
 gem 'fixer'
 gem 'kgio'
 gem 'newrelic_rpm'
 gem 'oj'
-gem 'rack-cache'
 gem 'rack-cors'
 gem 'rake'
 gem 'sequel_pg'

Gemfile.lock

@@ -3,7 +3,6 @@ GEM
   specs:
     ast (2.3.0)
     coderay (1.1.1)
-    dalli (2.7.6)
     fixer (0.7.0)
     kgio (2.11.0)
     method_source (0.8.2)
@@ -21,8 +20,6 @@ GEM
       method_source (~> 0.8.1)
       slop (~> 3.4)
     rack (1.6.5)
-    rack-cache (1.6.1)
-      rack (>= 0.4)
     rack-cors (0.4.0)
     rack-protection (1.5.3)
       rack
@@ -59,7 +56,6 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
-  dalli
   fixer
   kgio
   minitest
@@ -67,7 +63,6 @@ DEPENDENCIES
   newrelic_rpm
   oj
   pry
-  rack-cache
   rack-cors
   rack-test
   rake

docker-compose.yml

@@ -2,8 +2,6 @@ version: '2'
 services:
   db:
     image: postgres
-  memcache:
-    image: memcached
   web:
     build: .
     volumes:
@@ -13,7 +11,5 @@ services:
     environment:
       RACK_ENV: production
       DATABASE_URL: postgres://postgres@db/postgres
-      MEMCACHE_SERVERS: memcache
     links:
       - db
-      - memcache

lib/api.rb

@@ -1,16 +1,9 @@
 # frozen_string_literal: true
-require 'dalli'
 require 'oj'
 require 'sinatra'
-require 'rack/cache'
 require 'rack/cors'
 require 'quote'
 
-use Rack::Cache,
-    verbose: true,
-    metastore: "memcached://#{ENV['MEMCACHE_SERVERS']}/meta",
-    entitystore: "memcached://#{ENV['MEMCACHE_SERVERS']}/body"
-
 use Rack::Cors do
   allow do
     origins '*'
@@ -34,14 +27,11 @@ helpers do
 
   def quote_attributes
     @quote_attributes ||= quote.attributes.tap do |data|
+      symbols = params.values_at('symbols', 'to').compact.first
       data[:rates].keep_if { |k, _| symbols.include?(k) } if symbols
     end
   end
 
-  def symbols
-    @symbols ||= params.values_at('symbols', 'to').compact.first
-  end
-
   def jsonp(data)
     json = encode_json(data)
     callback = params.delete('callback')

spec/api_spec.rb

@@ -10,10 +10,6 @@ describe 'the API' do
   let(:json) { Oj.load(last_response.body) }
   let(:headers) { last_response.headers }
 
-  before do
-    Dalli::Client.new.flush
-  end
-
   it 'describes itself' do
     get '/'
     last_response.must_be :ok?
@@ -101,11 +97,4 @@ describe 'the API' do
     get '/latest?from=GBP&to=USD&amount=100'
     json['rates']['USD'].must_be :>, 100
   end
-
-  it 'sets Content-Type header to JSON when caching' do
-    2.times do
-      get '/latest'
-      last_response.headers['Content-Type'].must_equal 'application/json'
-    end
-  end
 end

spec/edge_cases_spec.rb

@@ -9,10 +9,6 @@ describe 'the API' do
   let(:app)  { Sinatra::Application }
   let(:json) { Oj.load(last_response.body) }
 
-  before do
-    Dalli::Client.new.flush
-  end
-
   it 'handles unfound pages' do
     get '/foo'
     last_response.status.must_equal 404