several response body#close fixes

Some middlewares require the Rack env to be preserved all
the way through to close, so we'll ensure all request models
preserve it.

We also need to better response body wrappers/proxies always get
fired properly when returning.  IO.copy_stream and "sendfile"
gem users could hit cases where wrappers did not fire properly.

1 files changed, 37 insertions, 0 deletions

diff --git a/lib/rainbows/sync_close.rb b/lib/rainbows/sync_close.rb
new file mode 100644
index 0000000..a336262
--- /dev/null
+++ b/lib/rainbows/sync_close.rb
@@ -0,0 +1,37 @@
+# -*- encoding: binary -*-
+# :enddoc:
+require 'thread'
+class Rainbows::SyncClose
+  def initialize(body)
+    @body = body
+    @mutex = Mutex.new
+    @cv = ConditionVariable.new
+    @mutex.synchronize do
+      yield self
+      @cv.wait(@mutex)
+    end
+  end
+
+  def respond_to?(m)
+    @body.respond_to?(m)
+  end
+
+  def to_path
+    @body.to_path
+  end
+
+  def each(&block)
+    @body.each(&block)
+  end
+
+  def to_io
+    @body.to_io
+  end
+
+  # called by the writer thread to wake up the original thread (in #initialize)
+  def close
+    @body.close
+    ensure
+      @mutex.synchronize { @cv.signal }
+  end
+end