Use Redis as Rails cache store (closes #16)

.travis.yml

@@ -24,6 +24,11 @@ env:
     - SIDEKIQ_SERVER_REDIS_DB=0
     - SIDEKIQ_SERVER_REDIS_PASSWORD=
 
+    - RAILS_CACHE_REDIS_HOST=localhost
+    - RAILS_CACHE_REDIS_PORT=6379
+    - RAILS_CACHE_REDIS_DB=1
+    - RAILS_CACHE_REDIS_PASSWORD=
+
 before_install:
   - sudo apt install qt4-qmake libqt4-dev libqtwebkit-dev xvfb
 

config/cache_store.yml

@@ -0,0 +1,12 @@
+default: &default
+  redis_host: <%= ENV.fetch('RAILS_CACHE_REDIS_HOST') { 'localhost' } %>
+  redis_port: <%= ENV.fetch('RAILS_CACHE_REDIS_PORT') { 6379 } %>
+  redis_db:   <%= ENV.fetch('RAILS_CACHE_REDIS_DB') { 1 } %>
+
+development:
+  <<: *default
+  redis_password: <%= ENV.fetch('RAILS_CACHE_REDIS_PASSWORD') { 'password' } %>
+
+production:
+  <<: *default
+  redis_password: <%= Rails.application.credentials.rails_cache_redis_password %>

config/credentials.yml.enc

@@ -1 +1 @@
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config/environments/production.rb

@@ -65,7 +65,13 @@ Rails.application.configure do
   config.log_tags = [:request_id]
 
   # Use a different cache store in production.
-  # config.cache_store = :mem_cache_store
+  cache_conf = Rails.application.config_for(:cache_store).deep_symbolize_keys
+  config.cache_store = :redis_cache_store, {
+    host:     cache_conf[:host],
+    port:     cache_conf[:port],
+    db:       cache_conf[:db],
+    password: cache_conf[:password],
+  }
 
   # Use a real queuing backend for Active Job
   # (and separate queues per environment).