add stackprof

.gitignore

@@ -5,3 +5,4 @@ vendor
 config/skylight.yml
 .coverage
 *.env
+tmp

Gemfile

@@ -30,6 +30,7 @@ gem 'metriks-librato_metrics', github: 'eric/metriks-librato_metrics'
 gem 'micro_migrations'
 gem 'simplecov'
 gem 'skylight', '~> 0.6.0.beta.1'
+gem 'stackprof'
 
 group :test do
   gem 'rspec',         '~> 2.13'

Gemfile.lock

@@ -305,6 +305,7 @@ GEM
       multi_json (~> 1.0)
       rack (~> 1.0)
       tilt (~> 1.1, != 1.3.0)
+    stackprof (0.2.7)
     thin (1.6.3)
       daemons (~> 1.0, >= 1.0.9)
       eventmachine (~> 1.0)
@@ -364,6 +365,7 @@ DEPENDENCIES
   sinatra
   sinatra-contrib
   skylight (~> 0.6.0.beta.1)
+  stackprof
   travis-api!
   travis-config (~> 0.1.0)
   travis-core!

lib/travis/api/app.rb

@@ -79,6 +79,13 @@ module Travis::Api
 
     def initialize
       @app = Rack::Builder.app do
+
+        if ENV['STACKPROF']
+          require 'stackprof'
+          puts "Setting up stack profiling."
+          use StackProf::Middleware, enabled: true, save_every: 1, mode: :object
+        end
+
         extend StackInstrumentation
         use Travis::Api::App::Middleware::Skylight
         use(Rack::Config) { |env| env['metriks.request.start'] ||= Time.now.utc }