Rack: clear context in ensure. If Sentry causes exception, make sure we still clear contexts

Author: nateberkopec

lib/raven/integrations/rack.rb

@@ -41,10 +41,6 @@ def initialize(app)
     end
 
     def call(env)
-      # clear context at the beginning of the request to ensure a clean slate
-      Context.clear!
-      BreadcrumbBuffer.clear!
-
       # store the current environment in our local context for arbitrary
       # callers
       env['raven.requested_at'] = Time.now
@@ -64,6 +60,9 @@ def call(env)
       Raven::Rack.capture_exception(error, env) if error
 
       response
+    ensure
+      Context.clear!
+      BreadcrumbBuffer.clear!
     end
   end