remove sleep in integration after etcd store startup, periodic SyncCluster in etcd and include fix to SyncCluster in go-etcd lib

Signed-off-by: Alexandre Beslic <abronan@docker.com>

Godeps/Godeps.json

@@ -32,8 +32,8 @@
 		},
 		{
 			"ImportPath": "github.com/coreos/go-etcd/etcd",
-			"Comment": "v2.0.0-7-g73a8ef7",
-			"Rev": "73a8ef737e8ea002281a28b4cb92a1de121ad4c6"
+			"Comment": "v2.0.0-8-g2698e87",
+			"Rev": "2698e87871614d7f376775409c701dd538f0b50e"
 		},
 		{
 			"ImportPath": "github.com/docker/docker/pkg/ioutils",

Godeps/_workspace/src/github.com/coreos/go-etcd/etcd/client.go

@@ -312,6 +312,9 @@ func (c *Client) SyncCluster() bool {
 
 // internalSyncCluster syncs cluster information using the given machine list.
 func (c *Client) internalSyncCluster(machines []string) bool {
+	// comma-separated list of machines in the cluster.
+	members := ""
+
 	for _, machine := range machines {
 		httpPath := c.createHttpPath(machine, path.Join(version, "members"))
 		resp, err := c.httpClient.Get(httpPath)
@@ -333,8 +336,7 @@ func (c *Client) internalSyncCluster(machines []string) bool {
 				// try another machine in the cluster
 				continue
 			}
-			// update Machines List
-			c.cluster.updateFromStr(string(b))
+			members = string(b)
 		} else {
 			b, err := ioutil.ReadAll(resp.Body)
 			resp.Body.Close()
@@ -355,9 +357,16 @@ func (c *Client) internalSyncCluster(machines []string) bool {
 			}
 
 			// update Machines List
-			c.cluster.updateFromStr(strings.Join(urls, ","))
+			members = strings.Join(urls, ",")
 		}
 
+		// We should never do an empty cluster update.
+		if members == "" {
+			continue
+		}
+
+		// update Machines List
+		c.cluster.updateFromStr(members)
 		logger.Debug("sync.machines ", c.cluster.Machines)
 		c.saveConfig()
 		return true

pkg/store/etcd.go

@@ -28,6 +28,9 @@ type etcdLock struct {
 const (
 	defaultLockTTL    = 20 * time.Second
 	defaultUpdateTime = 5 * time.Second
+
+	// periodicSync is the time between each call to SyncCluster
+	periodicSync = 10 * time.Minute
 )
 
 // InitializeEtcd creates a new Etcd client given
@@ -51,7 +54,12 @@ func InitializeEtcd(addrs []string, options *Config) (Store, error) {
 		}
 	}
 
-	s.client.SyncCluster()
+	go func() {
+		for {
+			s.client.SyncCluster()
+			time.Sleep(periodicSync)
+		}
+	}()
 	return s, nil
 }
 

test/integration/discovery/etcd.bats

@@ -19,8 +19,6 @@ function start_store() {
 		quay.io/coreos/etcd:v2.0.11 \
 		--listen-client-urls="http://0.0.0.0:${PORT}" \
 		--advertise-client-urls="http://${STORE_HOST}"
-
-	sleep 3
 }
 
 function stop_store() {