From cfb7f6188b9cb59bad71baececf78436a1006fed Mon Sep 17 00:00:00 2001
From: Aaron Feng <aaron@forty9ten.com>
Date: Sat, 14 Jun 2014 05:08:59 -0700
Subject: [PATCH] add heartbeat to attach

Docker-DCO-1.1-Signed-off-by: Aaron Feng <aaron.feng@gmail.com> (github: aaronfeng)
---
 backends/ec2.go | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/backends/ec2.go b/backends/ec2.go
index 5a320fa3d7..d2e5433d50 100644
--- a/backends/ec2.go
+++ b/backends/ec2.go
@@ -1,6 +1,7 @@
 package backends
 
 import (
+  "time"
   "fmt"
   "github.com/docker/libswarm/beam"
 )
@@ -55,9 +56,15 @@ func (c *ec2Client) stop(ctx *beam.Message) error {
 func (c *ec2Client) attach(ctx *beam.Message) error {
   fmt.Println("*** ec2 OnAttach ***")
   ctx.Ret.Send(&beam.Message{Verb: beam.Ack, Ret: c.Server})
+
+  for {
+     time.Sleep(1 * time.Second)
+     (&beam.Object{ctx.Ret}).Log("ec2: heartbeat")
+  }
   return nil
 }
 
+
 func Ec2() beam.Sender {
   backend := beam.NewServer()
   backend.OnSpawn(beam.Handler(func(ctx *beam.Message) error {