EventMachine: support deferrables in responses

Some async apps rely on more than just "async.callback" and
make full use of Deferrables provided by the EM::Deferrable
module.  Thanks to James Tucker for bringing this to our
attention.

1 files changed, 2 insertions, 0 deletions

diff --git a/lib/rainbows/ev_core.rb b/lib/rainbows/ev_core.rb
index 0d3c079..a9c5bfc 100644
--- a/lib/rainbows/ev_core.rb
+++ b/lib/rainbows/ev_core.rb
@@ -11,6 +11,8 @@ module Rainbows
     # Apps may return this Rack response: AsyncResponse = [ -1, {}, [] ]
     ASYNC_CALLBACK = "async.callback".freeze
 
+    ASYNC_CLOSE = "async.close".freeze
+
     def post_init
       @remote_addr = ::TCPSocket === @_io ? @_io.peeraddr.last : LOCALHOST
       @env = {}