Add New Relic support

README.md

@@ -94,6 +94,25 @@ The following is a list of some popular variables that don't require the use of
  - `stage`: Name of the stage from the capistrano multistage extension.
  - `user_name`: Name of the local git author.
 
+## New Relic
+
+This notifier can be useful if you're using [New Relic](https://newrelic.com/) but not [using the Ruby agent](https://newrelic.com/docs/ruby/recording-deployments-with-the-ruby-agent) (so you don't have the rpm_newrelic gem installed or a config/newrelic.yml file.)
+
+```rb
+require 'capistrano/notifier/new_relic'
+
+set :notifier_new_relic_options, {
+  :api_key => 'fffffffffffffffffffffffffffffffffffffffffffffff',
+  :application_id => 1234567
+}
+```
+
+Both `:api_key` and `:application_id` must be present. If you set a `NOTES` environment variable:
+
+    cap deploy NOTES="fix everything"
+
+The notes will be added as the deployment description.
+
 ## StatsD
 
 ```rb

lib/capistrano/notifier/new_relic.rb

@@ -0,0 +1,64 @@
+require 'capistrano/notifier'
+require 'net/http'
+require 'uri'
+
+class Capistrano::Notifier::NewRelic < Capistrano::Notifier::Base
+  DEFAULTS = {}
+
+  def self.load_into(configuration)
+    configuration.load do
+      namespace :deploy do
+        namespace :notify do
+          desc 'Notify New Relic of deploy.'
+          task :new_relic do
+            run Capistrano::Notifier::NewRelic.new(configuration).command
+          end
+        end
+      end
+
+      after 'deploy', 'deploy:notify:new_relic'
+    end
+  end
+
+  def command
+    post = Net::HTTP::Post.new(uri.request_uri)
+    post.add_field 'x-api-key', options[:api_key]
+    post.set_form_data form_data
+    response_text = ""
+    Net::HTTP.start(uri.hostname, uri.port, :use_ssl => true) do |http|
+      response = http.request(post)
+      response_text = "#{response.code} #{response.message}"
+    end
+    "echo New Relic Deploy notification result: #{response_text}"
+  end
+
+  private
+
+  def options
+    if cap.respond_to? :notifier_new_relic_options
+      cap.notifier_new_relic_options.reverse_merge DEFAULTS
+    else
+      DEFAULTS
+    end
+  end
+
+  # Form data to be posted
+  def form_data
+    @form_data ||= {
+      'deployment[app_name]'       => options[:app_name],
+      'deployment[application_id]' => options[:application_id],
+      'deployment[description]'    => ENV['NOTES'],
+      'deployment[revision]'       => git_current_revision,
+      'deployment[changelog]'      => git_log,
+      'deployment[user]'           => user_name
+    }
+  end
+
+  def uri
+    @uri ||= URI('https://rpm.newrelic.com/deployments.xml')
+  end
+end
+
+if Capistrano::Configuration.instance
+  Capistrano::Notifier::NewRelic.load_into(Capistrano::Configuration.instance)
+end

spec/capistrano/notifier/new_relic_spec.rb

@@ -0,0 +1,30 @@
+require 'spec_helper'
+require 'capistrano/notifier/new_relic'
+
+describe Capistrano::Notifier::NewRelic do
+  let(:configuration) { Capistrano::Configuration.new }
+  let(:post) { mock(:post, :add_field     => nil,
+                           :set_body_internal  => nil,
+                           :response_body_permitted? => nil,
+                           :[] => nil,
+                           :[]= => nil,
+                           :path => nil,
+                           :exec => nil,
+                           :set_form_data => nil) }
+  subject { described_class.new configuration }
+
+  before :each do
+    configuration.load do
+      set :application, 'example'
+      set :notifier_new_relic_options, {
+        :api_key        => 'ffffff',
+        :application_id => 12345
+      }
+    end
+    Net::HTTP::Post.stub(:new).and_return(post)
+  end
+
+  describe '#command' do
+    it 'posts to the newrelic api'
+  end
+end