Add rack-attack, block one client who's hammering us.

Gemfile

@@ -14,6 +14,7 @@ gem 'sentry-raven',    github: 'getsentry/raven-ruby'
 gem 'yard-sinatra',    github: 'rkh/yard-sinatra'
 gem 'rack-contrib',    github: 'rack/rack-contrib'
 gem 'rack-cache',      '~> 1.2'
+gem 'rack-attack'
 gem 'gh'
 gem 'bunny'
 gem 'dalli'

Gemfile.lock

@@ -193,6 +193,8 @@ GEM
       multi_json (~> 1.0)
       signature (~> 0.1.6)
     rack (1.4.5)
+    rack-attack (2.2.0)
+      rack
     rack-cache (1.2)
       rack (>= 0.4)
     rack-protection (1.5.0)
@@ -288,6 +290,7 @@ DEPENDENCIES
   mocha (~> 0.12)
   pry
   puma (= 2.3.1)
+  rack-attack
   rack-cache (~> 1.2)
   rack-contrib!
   rake (~> 0.9.2)

lib/travis/api/app.rb

@@ -4,6 +4,7 @@ require 'rack'
 require 'rack/protection'
 require 'rack/contrib'
 require 'rack/cache'
+require 'rack/attack'
 require 'active_record'
 require 'redis'
 require 'gh'
@@ -86,6 +87,12 @@ module Travis::Api
           env['travis.global_prefix'] = env['SCRIPT_NAME']
         end
 
+        use Rack::Attack
+
+        Rack::Attack.blacklist('block client requesting ruby builds') do |req|
+          req.ip == "130.15.4.210"
+        end
+
         use Travis::Api::App::Middleware::ScopeCheck
         use Travis::Api::App::Middleware::Logging
         use Travis::Api::App::Middleware::Metriks