From cba47513888c5cdea0105b334862a50ffa7a0dcb Mon Sep 17 00:00:00 2001
From: Edward Anderson <nilbus@nilbus.com>
Date: Mon, 14 Sep 2015 12:58:10 -0400
Subject: [PATCH] Cache pages for :zap: lightning speed

---
 .gitignore                               |  1 +
 Gemfile                                  |  1 +
 Gemfile.lock                             |  3 +++
 README.md                                |  4 ++++
 app/controllers/portfolios_controller.rb | 22 +++++++++++++++++-----
 config/environments/production.rb        |  2 ++
 public/page_cache/.gitkeep               |  0
 7 files changed, 28 insertions(+), 5 deletions(-)
 create mode 100644 public/page_cache/.gitkeep

diff --git a/.gitignore b/.gitignore
index c58eb54..78f85b0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -10,6 +10,7 @@
 /log/*
 /public/system
 /public/assets
+/public/page_cache
 /tags
 /tmp/*
 /config/secrets.yml
diff --git a/Gemfile b/Gemfile
index 52a42e4..4830263 100644
--- a/Gemfile
+++ b/Gemfile
@@ -3,6 +3,7 @@ source "https://rubygems.org"
 ruby "2.2.3"
 
 gem "adamantium"
+gem "actionpack-page_caching", "~> 1.0"
 gem "airbrake"
 gem "autoprefixer-rails"
 gem "bourbon", "~> 4.2.0"
diff --git a/Gemfile.lock b/Gemfile.lock
index df488e6..69d4005 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -14,6 +14,8 @@ GEM
       rack-test (~> 0.6.2)
       rails-dom-testing (~> 1.0, >= 1.0.5)
       rails-html-sanitizer (~> 1.0, >= 1.0.2)
+    actionpack-page_caching (1.0.2)
+      actionpack (>= 4.0.0, < 5)
     actionview (4.2.3)
       activesupport (= 4.2.3)
       builder (~> 3.1)
@@ -312,6 +314,7 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
+  actionpack-page_caching (~> 1.0)
   adamantium
   airbrake
   autoprefixer-rails
diff --git a/README.md b/README.md
index f41d070..d5a7229 100644
--- a/README.md
+++ b/README.md
@@ -52,6 +52,10 @@ After bundler installs gems, these initial setup steps will get the app running:
 
         rails server
 
+* (Optional) For fast page loads, [configure your web server][1] to use the page
+  caches that the app generates in `public/page_cache/`.
+[1]: https://github.com/rails/actionpack-page_caching/issues/27#issuecomment-110550147
+
 Customizing
 ===========
 
diff --git a/app/controllers/portfolios_controller.rb b/app/controllers/portfolios_controller.rb
index 9f43302..aa57f27 100644
--- a/app/controllers/portfolios_controller.rb
+++ b/app/controllers/portfolios_controller.rb
@@ -1,4 +1,6 @@
 class PortfoliosController < ApplicationController
+  caches_page :index, :show
+
   def index
   end
 
@@ -7,11 +9,7 @@ def show
     @portfolio = PortfolioStore.new.find(@github_username)
     respond_to do |format|
       format.html { render :loading if @portfolio.nil? }
-      format.json do
-        @portfolio = FetchDataWorker.new(@github_username).perform
-        message = 'reload; portfolio serialization to json not yet supported'
-        render json: {result: message}
-      end
+      format.json { reload_portfolio(@github_username) }
     end
   end
 
@@ -19,4 +17,18 @@ def reload
     @github_username = params[:id]
     render :loading
   end
+
+  private
+
+  def reload_portfolio(github_username)
+    @portfolio = FetchDataWorker.new(github_username).perform
+    expire_page_cache(github_username)
+    message = 'reload; portfolio serialization to json not yet supported'
+    render json: {result: message}
+  end
+
+  def expire_page_cache(github_username)
+    expire_page "/#{github_username}"
+    expire_page '/' if github_username == ENV['PORTFOLIO']
+  end
 end
diff --git a/config/environments/production.rb b/config/environments/production.rb
index db5560c..b59aaf2 100644
--- a/config/environments/production.rb
+++ b/config/environments/production.rb
@@ -28,6 +28,8 @@
   # Enable deflate / gzip compression of controller-generated responses
   config.middleware.use Rack::Deflater
 
+  config.action_controller.page_cache_directory = Rails.root.join "public/page_cache"
+
   # Ensure requests are only served from one, canonical host name
   config.middleware.use Rack::CanonicalHost, ENV.fetch("HOST")
 
diff --git a/public/page_cache/.gitkeep b/public/page_cache/.gitkeep
new file mode 100644
index 0000000..e69de29