1 files changed, 14 insertions, 0 deletions
diff --git a/vendor/github.com/hashicorp/memberlist/ping_delegate.go b/vendor/github.com/hashicorp/memberlist/ping_delegate.go
new file mode 100644
index 000000000..1566c8b3d
--- /dev/null
+++ b/vendor/github.com/hashicorp/memberlist/ping_delegate.go
@@ -0,0 +1,14 @@
+package memberlist
+
+import "time"
+
+// PingDelegate is used to notify an observer how long it took for a ping message to
+// complete a round trip.  It can also be used for writing arbitrary byte slices
+// into ack messages. Note that in order to be meaningful for RTT estimates, this
+// delegate does not apply to indirect pings, nor fallback pings sent over TCP.
+type PingDelegate interface {
+	// AckPayload is invoked when an ack is being sent; the returned bytes will be appended to the ack
+	AckPayload() []byte
+	// NotifyPing is invoked when an ack for a ping is received
+	NotifyPingComplete(other *Node, rtt time.Duration, payload []byte)
+}