avoid direct require of "rack" to quiet warnings

This quiets down warnings when used with RubyGems loaders such
as Isolate and Bundler where the HTTP server already loaded
Rack.

2 files changed, 5 insertions, 2 deletions

diff --git a/lib/clogger.rb b/lib/clogger.rb
index 641d5c5..8567c91 100644
--- a/lib/clogger.rb
+++ b/lib/clogger.rb
@@ -1,4 +1,6 @@
 # -*- encoding: binary -*-
+autoload :Rack, 'rack'
+
 class Clogger
   VERSION = '0.3.2'
 
diff --git a/lib/clogger/pure.rb b/lib/clogger/pure.rb
index b871c62..e9a8e6a 100644
--- a/lib/clogger/pure.rb
+++ b/lib/clogger/pure.rb
@@ -1,13 +1,14 @@
 # -*- encoding: binary -*-
 # :stopdoc:
 
-require 'rack'
-
 # Not at all optimized for performance, this was written based on
 # the original C extension code so it's not very Ruby-ish...
 class Clogger
 
   def initialize(app, opts = {})
+    # trigger autoload to avoid thread-safety issues later on
+    Rack::Utils::HeaderHash.new({})
+
     @app = app
     @logger = opts[:logger]
     (@logger.sync = true) rescue nil