add memberlist config data

Signed-off-by: Evan Hazlett <ejhazlett@gmail.com>

agent.go

@@ -26,6 +26,7 @@ type Agent struct {
 	nodeEventChan      chan *NodeEvent
 	grpcServer         *grpc.Server
 	registeredServices map[string]struct{}
+	memberConfig       *memberlist.Config
 }
 
 // NewAgent returns a new node agent
@@ -48,9 +49,15 @@ func NewAgent(cfg *Config) (*Agent, error) {
 		peerUpdateChan: updateCh,
 		nodeEventChan:  nodeEventCh,
 		grpcServer:     grpcServer,
+		memberConfig:   mc,
 	}, nil
 }
 
+// SyncInterval returns the cluster sync interval
+func (a *Agent) SyncInterval() time.Duration {
+	return a.memberConfig.PushPullInterval
+}
+
 // Subscribe subscribes to the node event channel
 func (a *Agent) Subscribe(ch chan *NodeEvent) {
 	go func() {

service.go

@@ -3,6 +3,8 @@ package element
 import "google.golang.org/grpc"
 
 type Service interface {
+	// ID is the name of the service
 	ID() string
+	// Register is used to register the GRPC service
 	Register(srv *grpc.Server) error
 }