refactor external-resizer to use csi-lib-utils/rpc

pkg/client/client.go

@@ -0,0 +1,59 @@
+/*
+Copyright 2019 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package client
+
+import (
+	"context"
+
+	"github.com/container-storage-interface/spec/lib/go/csi"
+	"google.golang.org/grpc"
+)
+
+// Client is a gRPC client connect to remote CSI driver and abstracts all CSI calls.
+type Client interface {
+	// Expand expands the volume to a new size at least as big as requestBytes.
+	// It returns the new size and whether the volume need expand operation on the node.
+	Expand(ctx context.Context, volumeID string, requestBytes int64, secrets map[string]string) (int64, bool, error)
+}
+
+// New creates a new CSI client.
+func New(conn *grpc.ClientConn) Client {
+	return &client{
+		ctrlClient: csi.NewControllerClient(conn),
+	}
+}
+
+type client struct {
+	ctrlClient csi.ControllerClient
+}
+
+func (c *client) Expand(
+	ctx context.Context,
+	volumeID string,
+	requestBytes int64,
+	secrets map[string]string) (int64, bool, error) {
+	req := &csi.ControllerExpandVolumeRequest{
+		Secrets:       secrets,
+		VolumeId:      volumeID,
+		CapacityRange: &csi.CapacityRange{RequiredBytes: requestBytes},
+	}
+	resp, err := c.ctrlClient.ControllerExpandVolume(ctx, req)
+	if err != nil {
+		return 0, false, err
+	}
+	return resp.CapacityBytes, resp.NodeExpansionRequired, nil
+}