1 files changed, 30 insertions, 0 deletions
diff --git a/actionpack/lib/action_controller/cgi_ext/pstore_performance_fix.rb b/actionpack/lib/action_controller/cgi_ext/pstore_performance_fix.rb
new file mode 100644
index 0000000000..ad08fbe7bf
--- /dev/null
+++ b/actionpack/lib/action_controller/cgi_ext/pstore_performance_fix.rb
@@ -0,0 +1,30 @@
+# CGI::Session::Pstore.initialize requires 'digest/md5' on every call.
+# This makes sense when spawning processes per request, but is
+# unnecessarily expensive when serving requests from a long-lived
+# process.
+require 'cgi/session'
+require 'cgi/session/pstore'
+require 'digest/md5'
+
+class CGI::Session::Pstore #:nodoc:
+  def initialize(session, option={})
+    dir = option['tmpdir'] || Dir::tmpdir
+    prefix = option['prefix'] || ''
+    id = session.session_id
+    md5 = Digest::MD5.hexdigest(id)[0,16]
+    path = dir+"/"+prefix+md5
+    path.untaint
+    if File::exist?(path)
+      @hash = nil
+    else
+      unless session.new_session
+        raise CGI::Session::NoSession, "uninitialized session"
+      end
+      @hash = {}
+    end
+    @p = ::PStore.new(path)
+    @p.transaction do |p|
+      File.chmod(0600, p.path)
+    end
+  end
+end