inmem: NopReceiver and NopSender

Signed-off-by: Solomon Hykes <solomon@docker.com>

inmem/nop.go

@@ -0,0 +1,17 @@
+package inmem
+
+import (
+	"io"
+)
+
+type NopSender struct{}
+
+func (s NopSender) Send(msg *Message, mode int) (Receiver, Sender, error) {
+	return NopReceiver{}, NopSender{}, nil
+}
+
+type NopReceiver struct{}
+
+func (r NopReceiver) Receive(mode int) (*Message, Receiver, Sender, error) {
+	return nil, nil, nil, io.EOF
+}