From a01e58afd9ef301db17e952a9a42a4ec96cc5661 Mon Sep 17 00:00:00 2001
From: Chuck Callebs <chuck@callebs.io>
Date: Mon, 20 Jul 2015 23:35:20 -0400
Subject: Add rake dev:cache task to enable dev mode caching.

Taken from @Sonopa's commits on PR #19091.

Add support for dev caching via "rails s" flags.

Implement suggestions from @kaspth.

Remove temporary cache file if server does not have flags.

Break at 80 characters in railties/CHANGELOG.md

Remove ability to disable cache based on server options.

Add more comprehensive options: --dev-caching / --no-dev-caching
---
 railties/lib/rails/commands/server.rb              | 23 ++++++++++++++++++++++
 .../config/environments/development.rb.tt          | 14 +++++++++++--
 railties/lib/rails/tasks.rb                        |  1 +
 railties/lib/rails/tasks/dev.rake                  | 15 ++++++++++++++
 4 files changed, 51 insertions(+), 2 deletions(-)
 create mode 100644 railties/lib/rails/tasks/dev.rake

(limited to 'railties/lib/rails')

diff --git a/railties/lib/rails/commands/server.rb b/railties/lib/rails/commands/server.rb
index d1e445ac70..8e7f206028 100644
--- a/railties/lib/rails/commands/server.rb
+++ b/railties/lib/rails/commands/server.rb
@@ -34,6 +34,9 @@ module Rails
           opts.on("-P", "--pid=pid", String,
                   "Specifies the PID file.",
                   "Default: tmp/pids/server.pid") { |v| options[:pid] = v }
+          opts.on("-C", "--[no-]dev-caching", 
+                  "Specifies whether to perform caching in development.",
+                  "true or false") { |v| options[:caching] = v }
 
           opts.separator ""
 
@@ -67,6 +70,7 @@ module Rails
       print_boot_information
       trap(:INT) { exit }
       create_tmp_directories
+      setup_dev_caching
       log_to_stdout if options[:log_stdout]
 
       super
@@ -86,12 +90,23 @@ module Rails
         DoNotReverseLookup: true,
         environment:        (ENV['RAILS_ENV'] || ENV['RACK_ENV'] || "development").dup,
         daemonize:          false,
+        caching:            false,
         pid:                File.expand_path("tmp/pids/server.pid")
       })
     end
 
     private
 
+      def setup_dev_caching
+        return unless options[:environment] == "development"
+
+        if options[:caching] == false
+          delete_cache_file
+        elsif options[:caching]
+          create_cache_file
+        end
+      end
+
       def print_boot_information
         url = "#{options[:SSLEnable] ? 'https' : 'http'}://#{options[:Host]}:#{options[:Port]}"
         puts "=> Booting #{ActiveSupport::Inflector.demodulize(server)}"
@@ -101,6 +116,14 @@ module Rails
         puts "=> Ctrl-C to shutdown server" unless options[:daemonize]
       end
 
+      def create_cache_file
+        FileUtils.touch("tmp/caching-dev.txt")
+      end
+
+      def delete_cache_file
+        FileUtils.rm("tmp/caching-dev.txt") if File.exists?("tmp/caching-dev.txt")
+      end
+
       def create_tmp_directories
         %w(cache pids sockets).each do |dir_to_make|
           FileUtils.mkdir_p(File.join(Rails.root, 'tmp', dir_to_make))
diff --git a/railties/lib/rails/generators/rails/app/templates/config/environments/development.rb.tt b/railties/lib/rails/generators/rails/app/templates/config/environments/development.rb.tt
index ecb5d4170f..34c60024a8 100644
--- a/railties/lib/rails/generators/rails/app/templates/config/environments/development.rb.tt
+++ b/railties/lib/rails/generators/rails/app/templates/config/environments/development.rb.tt
@@ -9,9 +9,19 @@ Rails.application.configure do
   # Do not eager load code on boot.
   config.eager_load = false
 
-  # Show full error reports and disable caching.
+  # Show full error reports.
   config.consider_all_requests_local       = true
-  config.action_controller.perform_caching = false
+
+  # Enable/disable caching. By default caching is disabled.
+  if Rails.root.join('tmp/caching-dev.txt').exist?
+    config.action_controller.perform_caching = true
+    config.static_cache_control = "public, max-age=172800"
+    config.cache_store = :memory_store
+  else
+    config.action_controller.perform_caching = false
+    config.cache_store = :null_store
+  end
+  
   <%- unless options.skip_action_mailer? -%>
 
   # Don't care if the mailer can't send.
diff --git a/railties/lib/rails/tasks.rb b/railties/lib/rails/tasks.rb
index 2c3d278eca..c029dbcf82 100644
--- a/railties/lib/rails/tasks.rb
+++ b/railties/lib/rails/tasks.rb
@@ -3,6 +3,7 @@ require 'rake'
 # Load Rails Rakefile extensions
 %w(
   annotations
+  dev
   framework
   initializers
   log
diff --git a/railties/lib/rails/tasks/dev.rake b/railties/lib/rails/tasks/dev.rake
new file mode 100644
index 0000000000..e949172d3f
--- /dev/null
+++ b/railties/lib/rails/tasks/dev.rake
@@ -0,0 +1,15 @@
+namespace :dev do
+  task :cache do
+    desc 'Toggle development mode caching on/off'
+
+    if File.exist? 'tmp/caching-dev.txt'
+      File.delete 'tmp/caching-dev.txt'
+      puts 'Development mode is no longer being cached.'
+    else
+      FileUtils.touch 'tmp/caching-dev.txt'
+      puts 'Development mode is now being cached.'
+    end
+
+    FileUtils.touch 'tmp/restart.txt'
+  end
+end
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