From 850b042cab7a8c202cffb712f865598329e2365d Mon Sep 17 00:00:00 2001
From: Sam <sam.saffron@gmail.com>
Date: Thu, 11 Apr 2013 16:24:08 +1000
Subject: [PATCH] introduce rack:cache as a default, so users don't need to
 configure apache or nginx

under rack cache we are able to serve 620reqs a second per thin (on my machine) before it 12 (on my machine)

reorganised so mini profilers can be cleanly disabled from config file

added caching for categories index

move production.rb to production.sample.rb
---
 Gemfile                                       |  8 ++++--
 Gemfile.lock                                  |  7 +++++-
 app/controllers/application_controller.rb     |  2 +-
 app/controllers/categories_controller.rb      |  1 +
 .../common/_discourse_javascript.html.erb     | 20 ++++-----------
 .../common/_discourse_stylesheet.html.erb     | 18 ++++++-------
 app/views/layouts/no_js.html.erb              | 18 +++----------
 config/application.rb                         |  8 +++++-
 config/environments/development.rb            |  6 ++---
 .../{production.rb => production.sample.rb}   | 25 +++++++++++++++----
 config/environments/profile.rb                | 14 ++++++-----
 .../{mini_profiler.rb => 06-mini_profiler.rb} |  6 +++++
 ...silencers.rb => 07-backtrace_silencers.rb} |  0
 config/initializers/99-rack-cache.rb          | 11 ++++++++
 lib/current_user.rb                           |  6 +++++
 lib/discourse_redis.rb                        | 14 ++++++++---
 16 files changed, 100 insertions(+), 64 deletions(-)
 rename config/environments/{production.rb => production.sample.rb} (62%)
 rename config/initializers/{mini_profiler.rb => 06-mini_profiler.rb} (92%)
 rename config/initializers/{backtrace_silencers.rb => 07-backtrace_silencers.rb} (100%)
 create mode 100644 config/initializers/99-rack-cache.rb

diff --git a/Gemfile b/Gemfile
index 92aeefd9503..ef02bd1b50e 100644
--- a/Gemfile
+++ b/Gemfile
@@ -112,8 +112,12 @@ gem 'fast_blank' #, github: "SamSaffron/fast_blank"
 
 # IMPORTANT: mini profiler monkey patches, so it better be required last
 #  If you want to amend mini profiler to do the monkey patches in the railstie
-#  we are open to it.
-gem 'rack-mini-profiler' #, git: 'git://github.com/SamSaffron/MiniProfiler'
+#  we are open to it. by deferring require to the initializer we can configure disourse installs without it
+gem 'rack-mini-profiler', require: false  # require: false #, git: 'git://github.com/SamSaffron/MiniProfiler'
+
+# used for caching, optional
+gem 'redis-rack-cache', require: false
+gem 'rack-cache', require: false
 
 # perftools only works on 1.9 atm
 group :profile do
diff --git a/Gemfile.lock b/Gemfile.lock
index b9a7c112757..340090ab075 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -319,7 +319,7 @@ GEM
     rack (1.4.5)
     rack-cache (1.2)
       rack (>= 0.4)
-    rack-mini-profiler (0.1.25)
+    rack-mini-profiler (0.1.26)
       rack (>= 1.1.3)
     rack-openid (1.3.1)
       rack (>= 1.1.0)
@@ -367,6 +367,9 @@ GEM
     redis-rack (1.4.2)
       rack (~> 1.4.1)
       redis-store (~> 1.1.0)
+    redis-rack-cache (1.2.1)
+      rack-cache (~> 1.2)
+      redis-store (~> 1.1.0)
     redis-rails (3.2.3)
       redis-actionpack (~> 3.2.3)
       redis-activesupport (~> 3.2.3)
@@ -514,6 +517,7 @@ DEPENDENCIES
   openid-redis-store
   pg
   pry-rails
+  rack-cache
   rack-mini-profiler
   rails
   rails_multisite!
@@ -522,6 +526,7 @@ DEPENDENCIES
   rb-inotify (~> 0.8.8)
   redcarpet
   redis
+  redis-rack-cache
   redis-rails
   rest-client
   rinku
diff --git a/app/controllers/application_controller.rb b/app/controllers/application_controller.rb
index 0b423b527d4..e0e744af2a0 100644
--- a/app/controllers/application_controller.rb
+++ b/app/controllers/application_controller.rb
@@ -140,7 +140,7 @@ class ApplicationController < ActionController::Base
 
   def can_cache_content?
     # Don't cache unless we're in production mode
-    return false unless Rails.env.production?
+    return false unless Rails.env.production? || Rails.env == "profile"
 
     # Don't cache logged in users
     return false if current_user.present?
diff --git a/app/controllers/categories_controller.rb b/app/controllers/categories_controller.rb
index ca98cbf72d5..1c6a62c0e85 100644
--- a/app/controllers/categories_controller.rb
+++ b/app/controllers/categories_controller.rb
@@ -6,6 +6,7 @@ class CategoriesController < ApplicationController
 
   def index
     list = CategoryList.new(current_user)
+    discourse_expires_in 1.minute
     render_serialized(list, CategoryListSerializer)
   end
 
diff --git a/app/views/common/_discourse_javascript.html.erb b/app/views/common/_discourse_javascript.html.erb
index c0c6ead0c4d..72b8f05d4ca 100644
--- a/app/views/common/_discourse_javascript.html.erb
+++ b/app/views/common/_discourse_javascript.html.erb
@@ -16,21 +16,11 @@
 
 <%# load the selected locale before any other scripts %>
 <%= javascript_include_tag "locales/#{I18n.locale}" %>
-
-<%- if mini_profiler_enabled? %>
-  <%- Rack::MiniProfiler.step "application" do %>
-    <%= javascript_include_tag "application" %>
-  <%-end%>
-
-  <%- Rack::MiniProfiler.step "admin" do %>
-    <%= javascript_include_tag "admin"%>
-  <%-end%>
-<%- else %>
-  <%= javascript_include_tag "application" %>
-  <%- if admin? %>
-    <%= javascript_include_tag "admin"%>
-  <%- end %>
-<%- end%>
+<%= javascript_include_tag "application" %>
+<%= javascript_include_tag "admin"%>
+<%- if admin? %>
+  <%= javascript_include_tag "admin"%>
+<%- end %>
 
 <script>
   Discourse.CDN = '<%= Rails.configuration.action_controller.asset_host  %>';
diff --git a/app/views/common/_discourse_stylesheet.html.erb b/app/views/common/_discourse_stylesheet.html.erb
index 4569a146340..87b248f024e 100644
--- a/app/views/common/_discourse_stylesheet.html.erb
+++ b/app/views/common/_discourse_stylesheet.html.erb
@@ -1,12 +1,8 @@
-    <%- unless SiteCustomization.override_default_style(session[:preview_style]) %>
-      <%=stylesheet_link_tag "application"%>
-    <%- end %>
+<%- unless SiteCustomization.override_default_style(session[:preview_style]) %>
+  <%=stylesheet_link_tag "application"%>
+<%- end %>
 
-    <%- if mini_profiler_enabled? %>
-      <%- Rack::MiniProfiler.step "stylsheet" do%>
-        <%= stylesheet_link_tag "admin"%>
-      <%-end%>
-    <%- elsif admin? %>
-      <%= stylesheet_link_tag "admin"%>
-    <%-end%>
-    <%=SiteCustomization.custom_stylesheet(session[:preview_style])%>
+<%- if admin? %>
+  <%= stylesheet_link_tag "admin"%>
+<%-end%>
+<%=SiteCustomization.custom_stylesheet(session[:preview_style])%>
diff --git a/app/views/layouts/no_js.html.erb b/app/views/layouts/no_js.html.erb
index 3cc0db48950..8b34cdb7e1e 100644
--- a/app/views/layouts/no_js.html.erb
+++ b/app/views/layouts/no_js.html.erb
@@ -8,21 +8,9 @@
     <meta content="" name="author">
     <link rel="icon" type="image/png" href=<%=SiteSetting.favicon_url%>>
 
-    <%- if mini_profiler_enabled? %>
-      <%- Rack::MiniProfiler.step "stylsheet" do%>
-        <%=stylesheet_link_tag "application"%>
-      <%- end %>
-      <%- if current_user.try(:admin) %>
-        <%- Rack::MiniProfiler.step "stylsheet" do%>
-          <%= stylesheet_link_tag "admin"%>
-        <%-end%>
-      <%- end %>
-
-    <%- else %>
-      <%=stylesheet_link_tag "application"%>
-      <%- if current_user.try(:admin) %>
-        <%= stylesheet_link_tag "admin"%>
-      <%- end %>
+    <%=stylesheet_link_tag "application"%>
+    <%- if current_user.try(:admin) %>
+      <%= stylesheet_link_tag "admin"%>
     <%- end %>
 
     <%=csrf_meta_tags%>
diff --git a/config/application.rb b/config/application.rb
index 5bbd27675f4..027e3f00d6d 100644
--- a/config/application.rb
+++ b/config/application.rb
@@ -92,9 +92,15 @@ module Discourse
     # Use redis for our cache
     config.cache_store = DiscourseRedis.new_redis_store
 
-    # Test with rack::cache disabled. Nginx does this for us
+    # we configure rack cache on demand in an initializer
+    # our setup does not use rack cache and instead defers to nginx
     config.action_dispatch.rack_cache =  nil
 
+    # ember stuff only used for asset precompliation, production variant plays up
+    config.ember.variant = :development
+    config.ember.ember_location = "#{Rails.root}/app/assets/javascripts/external_production/ember.js"
+    config.ember.handlebars_location = "#{Rails.root}/app/assets/javascripts/external/handlebars-1.0.rc.3.js"
+
     # So open id logs somewhere sane
     config.after_initialize do
       OpenID::Util.logger = Rails.logger
diff --git a/config/environments/development.rb b/config/environments/development.rb
index dd3074e7235..98f7d9597a2 100644
--- a/config/environments/development.rb
+++ b/config/environments/development.rb
@@ -29,15 +29,15 @@ Discourse::Application.configure do
   config.watchable_dirs['lib'] = [:rb]
 
   config.sass.debug_info = false
-  config.ember.variant = :development
-  config.ember.handlebars_location = "#{Rails.root}/app/assets/javascripts/external/handlebars-1.0.rc.3.js"
-  config.ember.ember_location = "#{Rails.root}/app/assets/javascripts/external/ember.js"
   config.handlebars.precompile = false
 
+  # we recommend you use mailcatcher https://github.com/sj26/mailcatcher
   config.action_mailer.delivery_method = :smtp
   config.action_mailer.smtp_settings = { address: "localhost", port: 1025 }
   config.action_mailer.raise_delivery_errors = true
 
   BetterErrors::Middleware.allow_ip! ENV['TRUSTED_IP'] if ENV['TRUSTED_IP']
+
+  config.enable_mini_profiler = true
 end
 
diff --git a/config/environments/production.rb b/config/environments/production.sample.rb
similarity index 62%
rename from config/environments/production.rb
rename to config/environments/production.sample.rb
index 2af04cf03e1..726a8810131 100644
--- a/config/environments/production.rb
+++ b/config/environments/production.sample.rb
@@ -27,17 +27,32 @@ Discourse::Application.configure do
   # the I18n.default_locale when a translation can not be found)
   config.i18n.fallbacks = true
 
+
+  # you may use other configuration here for mail eg: sendgrid
+
+  # config.action_mailer.delivery_method = :smtp
+  # config.action_mailer.smtp_settings = {
+  #   :address              => "smtp.sendgrid.net",
+  #   :port                 => 587,
+  #   :domain               => 'YOUR DOMAIN',
+  #   :user_name            => 'YOUR_USER',
+  #   :password             => 'YOUR_PASSWORD',
+  #   :authentication       => 'plain',
+  #   :enable_starttls_auto => true  }
+
   config.action_mailer.delivery_method = :sendmail
   config.action_mailer.sendmail_settings = {arguments: '-i'}
 
   # Send deprecation notices to registered listeners
   config.active_support.deprecation = :notify
 
-  # I dunno ... perhaps the built-in minifier is using closure
-  #   regardless it is blowing up
-  config.ember.variant = :development
-  config.ember.ember_location = "#{Rails.root}/app/assets/javascripts/external_production/ember.js"
-  config.ember.handlebars_location = "#{Rails.root}/app/assets/javascripts/external/handlebars-1.0.rc.3.js"
+  # this will cause all handlebars templates to be pre-compiles, making your page faster
   config.handlebars.precompile = true
 
+  # this setting enables rack_cache so it caches various requests in redis
+  config.enable_rack_cache = true
+
+  # allows admins to use mini profiler
+  config.enable_mini_profiler = true
+
 end
diff --git a/config/environments/profile.rb b/config/environments/profile.rb
index 97db037d7f5..98e74548da0 100644
--- a/config/environments/profile.rb
+++ b/config/environments/profile.rb
@@ -33,13 +33,15 @@ Discourse::Application.configure do
   # Send deprecation notices to registered listeners
   config.active_support.deprecation = :notify
 
-  # I dunno ... perhaps the built-in minifier is using closure
-  #   regardless it is blowing up
-  config.ember.variant = :development
-  config.ember.ember_location = "#{Rails.root}/app/assets/javascripts/external_production/ember.js"
-  config.ember.handlebars_location = "#{Rails.root}/app/assets/javascripts/external/handlebars-1.0.rc.3.js"
+  # precompile handlebar assets
   config.handlebars.precompile = true
 
-  # config.middleware.use ::Rack::PerftoolsProfiler, default_printer: 'gif'
+  # this setting enable rack_cache so it caches various requests in redis
+  config.enable_rack_cache = false
 
+  # allows users to use mini profiler
+  config.enable_mini_profiler = false
+
+  # for profiling with perftools
+  # config.middleware.use ::Rack::PerftoolsProfiler, default_printer: 'gif'
 end
diff --git a/config/initializers/mini_profiler.rb b/config/initializers/06-mini_profiler.rb
similarity index 92%
rename from config/initializers/mini_profiler.rb
rename to config/initializers/06-mini_profiler.rb
index 7427c5b1878..44752832d85 100644
--- a/config/initializers/mini_profiler.rb
+++ b/config/initializers/06-mini_profiler.rb
@@ -1,4 +1,10 @@
 # If Mini Profiler is included via gem
+if Rails.configuration.respond_to?(:enable_mini_profiler) && Rails.configuration.enable_mini_profiler
+  require 'rack-mini-profiler'
+  # initialization is skipped so trigger it
+  Rack::MiniProfilerRails.initialize!(Rails.application)
+end
+
 if defined?(Rack::MiniProfiler)
 
   # note, we may want to add some extra security here that disables mini profiler in a multi hosted env unless user global admin
diff --git a/config/initializers/backtrace_silencers.rb b/config/initializers/07-backtrace_silencers.rb
similarity index 100%
rename from config/initializers/backtrace_silencers.rb
rename to config/initializers/07-backtrace_silencers.rb
diff --git a/config/initializers/99-rack-cache.rb b/config/initializers/99-rack-cache.rb
new file mode 100644
index 00000000000..44595c26d98
--- /dev/null
+++ b/config/initializers/99-rack-cache.rb
@@ -0,0 +1,11 @@
+if Rails.configuration.respond_to?(:enable_rack_cache) && Rails.configuration.enable_rack_cache
+  require 'rack-cache'
+  require 'redis-rack-cache'
+
+  url = DiscourseRedis.url
+
+  Rails.configuration.middleware.insert 0, Rack::Cache,
+    metastore: "#{url}/metastore",
+    entitystore: "#{url}/entitystore",
+    verbose: !Rails.env.production?
+end
diff --git a/lib/current_user.rb b/lib/current_user.rb
index 05136ff4c7c..d909e5d1fb5 100644
--- a/lib/current_user.rb
+++ b/lib/current_user.rb
@@ -1,5 +1,11 @@
 module CurrentUser
 
+  def self.has_auth_cookie?(env)
+    request = Rack::Request.new(env)
+    cookie = request.cookies["_t"]
+    !cookie.nil? && cookie.length == 32
+  end
+
   def self.lookup_from_env(env)
     request = Rack::Request.new(env)
     lookup_from_auth_token(request.cookies["_t"])
diff --git a/lib/discourse_redis.rb b/lib/discourse_redis.rb
index cc0cd4996f5..853b5ee85c9 100644
--- a/lib/discourse_redis.rb
+++ b/lib/discourse_redis.rb
@@ -11,7 +11,12 @@ class DiscourseRedis
   end
 
   def self.config
-    YAML.load(ERB.new(File.new("#{Rails.root}/config/redis.yml").read).result)[Rails.env]
+    @config ||= YAML.load(ERB.new(File.new("#{Rails.root}/config/redis.yml").read).result)[Rails.env]
+  end
+
+  def self.url(config=nil)
+    config ||= self.config
+    "redis://#{(':' + config['password'] + '@') if config['password']}#{config['host']}:#{config['port']}/#{config['db']}"
   end
 
   def initialize
@@ -19,6 +24,10 @@ class DiscourseRedis
     @redis = DiscourseRedis.raw_connection(@config)
   end
 
+  def url
+    self.class.url(@config)
+  end
+
   # prefix the key with the namespace
   def method_missing(meth, *args, &block)
     if @redis.respond_to?(meth)
@@ -52,8 +61,5 @@ class DiscourseRedis
     redis_store
   end
 
-  def url
-    "redis://#{(':' + @config['password'] + '@') if @config['password']}#{@config['host']}:#{@config['port']}/#{@config['db']}"
-  end
 
 end