clientv3: Use LeaseID in all the client APIs.

In order to use LeaseID type instead of int64 we have to convert
the protobuf lease responses into client lease reponses.

clientv3/example_lease_test.go

@@ -39,7 +39,7 @@ func ExampleLease_grant() {
 	}
 
 	// after 5 seconds, the key 'foo' will be removed
-	_, err = cli.Put(context.TODO(), "foo", "bar", clientv3.WithLease(clientv3.LeaseID(resp.ID)))
+	_, err = cli.Put(context.TODO(), "foo", "bar", clientv3.WithLease(resp.ID))
 	if err != nil {
 		log.Fatal(err)
 	}
@@ -60,13 +60,13 @@ func ExampleLease_revoke() {
 		log.Fatal(err)
 	}
 
-	_, err = cli.Put(context.TODO(), "foo", "bar", clientv3.WithLease(clientv3.LeaseID(resp.ID)))
+	_, err = cli.Put(context.TODO(), "foo", "bar", clientv3.WithLease(resp.ID))
 	if err != nil {
 		log.Fatal(err)
 	}
 
 	// revoking lease expires the key attached to its lease ID
-	_, err = cli.Revoke(context.TODO(), clientv3.LeaseID(resp.ID))
+	_, err = cli.Revoke(context.TODO(), resp.ID)
 	if err != nil {
 		log.Fatal(err)
 	}
@@ -94,13 +94,13 @@ func ExampleLease_keepAlive() {
 		log.Fatal(err)
 	}
 
-	_, err = cli.Put(context.TODO(), "foo", "bar", clientv3.WithLease(clientv3.LeaseID(resp.ID)))
+	_, err = cli.Put(context.TODO(), "foo", "bar", clientv3.WithLease(resp.ID))
 	if err != nil {
 		log.Fatal(err)
 	}
 
 	// the key 'foo' will be kept forever
-	_, err = cli.KeepAlive(context.TODO(), clientv3.LeaseID(resp.ID))
+	_, err = cli.KeepAlive(context.TODO(), resp.ID)
 	if err != nil {
 		log.Fatal(err)
 	}
@@ -121,13 +121,13 @@ func ExampleLease_keepAliveOnce() {
 		log.Fatal(err)
 	}
 
-	_, err = cli.Put(context.TODO(), "foo", "bar", clientv3.WithLease(clientv3.LeaseID(resp.ID)))
+	_, err = cli.Put(context.TODO(), "foo", "bar", clientv3.WithLease(resp.ID))
 	if err != nil {
 		log.Fatal(err)
 	}
 
 	// to renew the lease only once
-	_, err = cli.KeepAliveOnce(context.TODO(), clientv3.LeaseID(resp.ID))
+	_, err = cli.KeepAliveOnce(context.TODO(), resp.ID)
 	if err != nil {
 		log.Fatal(err)
 	}

clientv3/lease.go

@@ -24,12 +24,25 @@ import (
 )
 
 type (
-	LeaseGrantResponse     pb.LeaseGrantResponse
-	LeaseRevokeResponse    pb.LeaseRevokeResponse
-	LeaseKeepAliveResponse pb.LeaseKeepAliveResponse
-	LeaseID                int64
+	LeaseRevokeResponse pb.LeaseRevokeResponse
+	LeaseID             int64
 )
 
+// LeaseGrantResponse is used to convert the protobuf grant response.
+type LeaseGrantResponse struct {
+	*pb.ResponseHeader
+	ID    LeaseID
+	TTL   int64
+	Error string
+}
+
+// LeaseKeepAliveResponse is used to convert the protobuf keepalive response.
+type LeaseKeepAliveResponse struct {
+	*pb.ResponseHeader
+	ID  LeaseID
+	TTL int64
+}
+
 const (
 	// a small buffer to store unsent lease responses.
 	leaseResponseChSize = 16
@@ -112,7 +125,13 @@ func (l *lessor) Grant(ctx context.Context, ttl int64) (*LeaseGrantResponse, err
 		r := &pb.LeaseGrantRequest{TTL: ttl}
 		resp, err := l.getRemote().LeaseGrant(cctx, r)
 		if err == nil {
-			return (*LeaseGrantResponse)(resp), nil
+			gresp := &LeaseGrantResponse{
+				ResponseHeader: resp.GetHeader(),
+				ID:             LeaseID(resp.ID),
+				TTL:            resp.TTL,
+				Error:          resp.Error,
+			}
+			return gresp, nil
 		}
 		if isHalted(cctx, err) {
 			return nil, err
@@ -245,7 +264,13 @@ func (l *lessor) keepAliveOnce(ctx context.Context, id LeaseID) (*LeaseKeepAlive
 	if rerr != nil {
 		return nil, rerr
 	}
-	return (*LeaseKeepAliveResponse)(resp), nil
+
+	karesp := &LeaseKeepAliveResponse{
+		ResponseHeader: resp.GetHeader(),
+		ID:             LeaseID(resp.ID),
+		TTL:            resp.TTL,
+	}
+	return karesp, nil
 }
 
 func (l *lessor) recvKeepAliveLoop() {
@@ -286,28 +311,32 @@ func (l *lessor) resetRecv() (pb.Lease_LeaseKeepAliveClient, error) {
 
 // recvKeepAlive updates a lease based on its LeaseKeepAliveResponse
 func (l *lessor) recvKeepAlive(resp *pb.LeaseKeepAliveResponse) {
-	id := LeaseID(resp.ID)
+	karesp := &LeaseKeepAliveResponse{
+		ResponseHeader: resp.GetHeader(),
+		ID:             LeaseID(resp.ID),
+		TTL:            resp.TTL,
+	}
 
 	l.mu.Lock()
 	defer l.mu.Unlock()
 
-	ka, ok := l.keepAlives[id]
+	ka, ok := l.keepAlives[karesp.ID]
 	if !ok {
 		return
 	}
 
-	if resp.TTL <= 0 {
+	if karesp.TTL <= 0 {
 		// lease expired; close all keep alive channels
-		delete(l.keepAlives, id)
+		delete(l.keepAlives, karesp.ID)
 		ka.Close()
 		return
 	}
 
 	// send update to all channels
-	nextDeadline := time.Now().Add(1 + time.Duration(resp.TTL/3)*time.Second)
+	nextDeadline := time.Now().Add(1 + time.Duration(karesp.TTL/3)*time.Second)
 	for _, ch := range ka.chs {
 		select {
-		case ch <- (*LeaseKeepAliveResponse)(resp):
+		case ch <- karesp:
 			ka.deadline = nextDeadline
 		default:
 		}