From baefdba8fb1a82fc808824cb828638385e9d873b Mon Sep 17 00:00:00 2001
From: Lamont Granquist <lamont@scriptkiddie.org>
Date: Tue, 3 Nov 2015 13:13:37 -0800
Subject: thread-safe performant lazy require

---
 lib/chef/http.rb | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/lib/chef/http.rb b/lib/chef/http.rb
index 8fa2569190..0d0abdddd8 100644
--- a/lib/chef/http.rb
+++ b/lib/chef/http.rb
@@ -200,7 +200,11 @@ class Chef
         # PERFORMANCE CRITICAL: *MUST* lazy require here otherwise we load up webrick
         # via chef-zero and that hits DNS (at *require* time) which may timeout,
         # when for most knife/chef-client work we never need/want this loaded.
-        require 'chef/http/socketless_chef_zero_client'
+        Thread.exclusive {
+          unless defined?(SocketlessChefZeroClient)
+            require 'chef/http/socketless_chef_zero_client'
+          end
+        }
         SocketlessChefZeroClient.new(base_url)
       else
         BasicClient.new(base_url, :ssl_policy => Chef::HTTP::APISSLPolicy)
-- 
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