Initial Implementation

Extracted from a PR against [ember-cli-rails].

`EmberCLI::Deploy` takes a `namespace` (the name of your app declared
in your initializer) and handles all interaction with the Redis
instance.

This is great for `staging` and `production` deploys, but introduces an
extra step in the feedback loop during development.

Luckily, `EmberCLI::Deploy` also accepts an `index_html` override, which
will replace the call to the Redis instance. This allows integration
with the normal `ember-cli-rails` workflow:

[ember-cli-rails]: tricknotes/ember-cli-rails#172

Author: seanpdoyle

.travis.yml

@@ -2,3 +2,5 @@ language: ruby
 rvm:
   - 2.2.2
 before_install: gem install bundler -v 1.10.5
+notifications:
+  email: false

Gemfile

@@ -1,4 +1,4 @@
-source 'https://rubygems.org'
+source "https://rubygems.org"
 
 # Specify your gem's dependencies in ember-cli-rails-deploy-redis.gemspec
 gemspec

README.md

@@ -1,4 +1,4 @@
-# EmberCLI Rails - Deploy Redis
+# EmberCLI::Rails - Deploy Redis
 
 [EmberCLI Rails] is an integration story between (surprise suprise) EmberCLI and
 Rails 3.1 and up.
@@ -36,36 +36,37 @@ This project attempts to streamline the process of pushing and serving
 EmberCLI-built static assets.
 
 To integrate with `ember-cli-deploy`'s ["Lightning Fast Deploys"][lightning]
-(using the Redis adapter), instantiate an `EmberCLI::Deploy` in your controller:
+(using the Redis adapter), instantiate an `EmberCLI::Deploy::Redis`
+in your controller:
 
 ```ruby
-require "ember-cli/deploy"
+require "ember-cli/deploy/redis"
 
 class ApplicationController < ActionController::Base
   def index
-    @deploy = EmberCLI::Deploy.new(namespace: "frontend")
+    @deploy = EmberCLI::Deploy::Redis.new(namespace: "frontend")
 
     render text: @deploy.html, layout: false
   end
 end
 ```
 
-`EmberCLI::Deploy` takes a `namespace` (the name of your app declared in your
-initializer) and handles all interaction with the Redis instance.
+`EmberCLI::Deploy::Redis` takes a `namespace` (the name of your app declared in
+your initializer) and handles all interaction with the Redis instance.
 
 This is great for `staging` and `production` deploys, but introduces an extra
 step in the feedback loop during development.
 
-Luckily, `EmberCLI::Deploy` also accepts an `index_html` override, which will
-replace the call to the Redis instance. This allows integration with the normal
-`ember-cli-rails` workflow:
+Luckily, `EmberCLI::Deploy::Redis` also accepts an `index_html` override, which
+will replace the call to the Redis instance. This allows integration with the
+normal `ember-cli-rails` workflow:
 
 ```ruby
-require "ember-cli/deploy"
+require "ember-cli/deploy/redis"
 
 class ApplicationController < ActionController::Base
   def index
-    @deploy = EmberCLI::Deploy.new(
+    @deploy = EmberCLI::Deploy::Redis.new(
       namespace: "frontend",
       index_html: index_html,
     )
@@ -97,7 +98,7 @@ require "ember-cli/deploy"
 
 class ApplicationController < ActionController::Base
   def index
-    @deploy = EmberCLI::Deploy.new(
+    @deploy = EmberCLI::Deploy::Redis.new(
       namespace: "frontend",
       index_html: index_html,
     )

ember-cli-rails-deploy-redis.gemspec

@@ -1,33 +1,31 @@
 # coding: utf-8
-lib = File.expand_path('../lib', __FILE__)
+lib = File.expand_path("../lib", __FILE__)
 $LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
-require 'ember/cli/rails/deploy/redis/version'
+require "ember-cli/deploy/version"
 
 Gem::Specification.new do |spec|
   spec.name          = "ember-cli-rails-deploy-redis"
-  spec.version       = Ember::Cli::Rails::Deploy::Redis::VERSION
+  spec.version       = EmberCLI::Rails::Deploy::VERSION
   spec.authors       = ["Sean Doyle"]
   spec.email         = ["sean.p.doyle24@gmail.com"]
 
-  spec.summary       = %q{TODO: Write a short summary, because Rubygems requires one.}
-  spec.description   = %q{TODO: Write a longer description or delete this line.}
-  spec.homepage      = "TODO: Put your gem's website or public repo URL here."
+  spec.summary       = %q{Lightning Fast deploys with ember-cli-rails}
+  spec.description   = %q{Lightning Fast deploys with ember-cli-rails}
+  spec.homepage      = "https://github.com/seanpdoyle/ember-cli-rails-deploy-redis"
   spec.license       = "MIT"
 
-  # Prevent pushing this gem to RubyGems.org by setting 'allowed_push_host', or
-  # delete this section to allow pushing this gem to any host.
-  if spec.respond_to?(:metadata)
-    spec.metadata['allowed_push_host'] = "TODO: Set to 'http://mygemserver.com'"
-  else
-    raise "RubyGems 2.0 or newer is required to protect against public gem pushes."
-  end
-
   spec.files         = `git ls-files -z`.split("\x0").reject { |f| f.match(%r{^(test|spec|features)/}) }
   spec.bindir        = "exe"
   spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
   spec.require_paths = ["lib"]
 
+  spec.add_dependency "railties", ">= 3.1", "< 5"
+  spec.add_dependency "redis", ">= 3.0"
+
   spec.add_development_dependency "bundler", "~> 1.10"
   spec.add_development_dependency "rake", "~> 10.0"
   spec.add_development_dependency "rspec"
+  spec.add_development_dependency "climate_control"
+  spec.add_development_dependency "fakeredis"
+  spec.add_development_dependency "pry"
 end

lib/ember-cli/deploy/page.rb

@@ -0,0 +1,55 @@
+module EmberCLI
+  module Deploy
+    class Page
+      def initialize(html:)
+        @html = html.clone
+        @body_markup = []
+        @head_markup = []
+      end
+
+      def build
+        if has_head?
+          head_markup.each do |markup|
+            html.insert(head_position, markup)
+          end
+        end
+
+        if has_body?
+          body_markup.each do |markup|
+            html.insert(body_position, markup)
+          end
+        end
+
+        html
+      end
+
+      def append_to_body(markup)
+        body_markup << markup
+      end
+
+      def append_to_head(markup)
+        head_markup << markup
+      end
+
+      private
+
+      attr_reader :body_markup, :head_markup, :html
+
+      def has_head?
+        html.include?("<head")
+      end
+
+      def has_body?
+        html.include?("<body")
+      end
+
+      def head_position
+        html.index("</head")
+      end
+
+      def body_position
+        html.index("</body")
+      end
+    end
+  end
+end

lib/ember-cli/deploy/redis.rb

@@ -0,0 +1,83 @@
+require "active_support/core_ext/object/blank"
+require "ember-cli/deploy/page"
+require "redis"
+
+module EmberCLI
+  module Deploy
+    class Redis
+      def initialize(namespace:, index_html: nil, redis_client: build_client)
+        @redis_client = redis_client
+        @namespace = namespace
+        @index_html = index_html
+        @body_markup = []
+        @head_markup = []
+      end
+
+      def append_to_body(markup)
+        body_markup << markup
+      end
+
+      def append_to_head(markup)
+        head_markup << markup
+      end
+
+      def html
+        if index_html.present?
+          page = Page.new(html: index_html)
+
+          body_markup.each do |markup|
+            page.append_to_body(markup)
+          end
+
+          head_markup.each do |markup|
+            page.append_to_head(markup)
+          end
+
+          page.build
+        else
+          index_html_missing!
+        end
+      end
+
+      private
+
+      attr_reader :body_markup, :head_markup, :namespace, :redis_client
+
+      def index_html
+        @index_html ||= redis_client.get(deploy_key).presence
+      end
+
+      def current_key
+        "#{namespace}:current"
+      end
+
+      def deploy_key
+        redis_client.get(current_key).presence || deployment_not_activated!
+      end
+
+      def build_client
+        ::Redis.new(url: ENV.fetch("REDIS_URL"))
+      end
+
+      def index_html_missing!
+        message = <<-FAIL
+        HTML for #{deploy_key} is missing.
+
+        Did you forget to call `ember deploy`?
+        FAIL
+
+        raise KeyError, message
+      end
+
+      def deployment_not_activated!
+        message = <<-FAIL
+        #{current_key} is empty.
+
+        Did you forget to call `ember deploy:activate`?
+        FAIL
+
+        raise KeyError, message
+      end
+    end
+  end
+end

lib/ember-cli/deploy/version.rb

@@ -0,0 +1,7 @@
+module EmberCLI
+  module Rails
+    module Deploy
+      VERSION = "0.0.1"
+    end
+  end
+end