update datastore interface

Author: aschmahmann

go.mod

@@ -1,7 +1,7 @@
 module github.com/ipfs/go-ds-measure
 
 require (
-	github.com/ipfs/go-datastore v0.1.1
+	github.com/ipfs/go-datastore v0.1.2-0.20191117181321-b6c12d5ad99c
 	github.com/ipfs/go-metrics-interface v0.0.1
 )
 

go.sum

@@ -8,6 +8,8 @@ github.com/ipfs/go-datastore v0.1.0 h1:TOxI04l8CmO4zGtesENhzm4PwkFwJXY3rKiYaaMf9
 github.com/ipfs/go-datastore v0.1.0/go.mod h1:d4KVXhMt913cLBEI/PXAy6ko+W7e9AhyAKBGh803qeE=
 github.com/ipfs/go-datastore v0.1.1 h1:F4k0TkTAZGLFzBOrVKDAvch6JZtuN4NHkfdcEZL50aI=
 github.com/ipfs/go-datastore v0.1.1/go.mod h1:w38XXW9kVFNp57Zj5knbKWM2T+KOZCGDRVNdgPHtbHw=
+github.com/ipfs/go-datastore v0.1.2-0.20191117181321-b6c12d5ad99c h1:TZdO+XZMCQ7IdveAYBI2oVX3FCM8dpZknJq8NU20Wqw=
+github.com/ipfs/go-datastore v0.1.2-0.20191117181321-b6c12d5ad99c/go.mod h1:w38XXW9kVFNp57Zj5knbKWM2T+KOZCGDRVNdgPHtbHw=
 github.com/ipfs/go-ipfs-delay v0.0.0-20181109222059-70721b86a9a8/go.mod h1:8SP1YXK1M1kXuc4KJZINY3TQQ03J2rwBG9QfXmbRPrw=
 github.com/ipfs/go-metrics-interface v0.0.1 h1:j+cpbjYvu4R8zbleSs36gvB7jR+wsL2fGD6n0jO4kdg=
 github.com/ipfs/go-metrics-interface v0.0.1/go.mod h1:6s6euYU4zowdslK0GKHmqaIZ3j/b/tL7HTWtJ4VPgWY=

measure.go

@@ -143,6 +143,10 @@ func (m *measure) Put(key datastore.Key, value []byte) error {
 	return err
 }
 
+func (m *measure) Sync(prefix datastore.Key) error {
+	return nil
+}
+
 func (m *measure) Get(key datastore.Key) (value []byte, err error) {
 	defer recordLatency(m.getLatency, time.Now())
 	m.getNum.Inc()