Merge pull request #92 from andrewsykim/conn-lib

external-snapshotter should use CSI connection lib

Gopkg.toml

@@ -55,4 +55,4 @@ required = [
 
 [[constraint]]
   name = "github.com/kubernetes-csi/csi-lib-utils"
-  version = "0.1.0"
+  version = "0.3.0"

cmd/csi-snapshotter/main.go

@@ -52,7 +52,7 @@ const (
 var (
 	snapshotter                     = flag.String("snapshotter", "", "Name of the snapshotter. The snapshotter will only create snapshot content for snapshot that requests a VolumeSnapshotClass with a snapshotter field set equal to this name.")
 	kubeconfig                      = flag.String("kubeconfig", "", "Absolute path to the kubeconfig file. Required only when running out of cluster.")
-	connectionTimeout               = flag.Duration("connection-timeout", 1*time.Minute, "Timeout for waiting for CSI driver socket.")
+	connectionTimeout               = flag.Duration("connection-timeout", 0, "The --connection-timeout flag is deprecated")
 	csiAddress                      = flag.String("csi-address", "/run/csi/socket", "Address of the CSI driver socket.")
 	createSnapshotContentRetryCount = flag.Int("create-snapshotcontent-retrycount", 5, "Number of retries when we create a snapshot content object for a snapshot.")
 	createSnapshotContentInterval   = flag.Duration("create-snapshotcontent-interval", 10*time.Second, "Interval between retries when we create a snapshot content object for a snapshot.")
@@ -76,6 +76,10 @@ func main() {
 	}
 	glog.Infof("Version: %s", version)
 
+	if *connectionTimeout != 0 {
+		glog.Warning("--connection-timeout is deprecated and will have no effect")
+	}
+
 	// Create the client config. Use kubeconfig if given, otherwise assume in-cluster.
 	config, err := buildConfig(*kubeconfig)
 	if err != nil {
@@ -116,7 +120,7 @@ func main() {
 	snapshotscheme.AddToScheme(scheme.Scheme)
 
 	// Connect to CSI.
-	csiConn, err := connection.New(*csiAddress, *connectionTimeout)
+	csiConn, err := connection.New(*csiAddress)
 	if err != nil {
 		glog.Error(err.Error())
 		os.Exit(1)

pkg/connection/connection.go

@@ -19,17 +19,14 @@ package connection
 import (
 	"context"
 	"fmt"
-	"net"
-	"strings"
-	"time"
 
 	"github.com/container-storage-interface/spec/lib/go/csi"
 	"github.com/golang/glog"
 	"github.com/golang/protobuf/ptypes"
 	"github.com/golang/protobuf/ptypes/timestamp"
+	"github.com/kubernetes-csi/csi-lib-utils/connection"
 	"github.com/kubernetes-csi/csi-lib-utils/protosanitizer"
 	"google.golang.org/grpc"
-	"google.golang.org/grpc/connectivity"
 	"k8s.io/api/core/v1"
 )
 
@@ -73,8 +70,8 @@ var (
 )
 
 // New returns a CSI connection object.
-func New(address string, timeout time.Duration) (CSIConnection, error) {
-	conn, err := connect(address, timeout)
+func New(address string) (CSIConnection, error) {
+	conn, err := connection.Connect(address)
 	if err != nil {
 		return nil, err
 	}
@@ -83,39 +80,6 @@ func New(address string, timeout time.Duration) (CSIConnection, error) {
 	}, nil
 }
 
-func connect(address string, timeout time.Duration) (*grpc.ClientConn, error) {
-	glog.V(2).Infof("Connecting to %s", address)
-	dialOptions := []grpc.DialOption{
-		grpc.WithInsecure(),
-		grpc.WithBackoffMaxDelay(time.Second),
-		grpc.WithUnaryInterceptor(logGRPC),
-	}
-	if strings.HasPrefix(address, "/") {
-		dialOptions = append(dialOptions, grpc.WithDialer(func(addr string, timeout time.Duration) (net.Conn, error) {
-			return net.DialTimeout("unix", addr, timeout)
-		}))
-	}
-	conn, err := grpc.Dial(address, dialOptions...)
-
-	if err != nil {
-		return nil, err
-	}
-	ctx, cancel := context.WithTimeout(context.Background(), timeout)
-	defer cancel()
-	for {
-		if !conn.WaitForStateChange(ctx, conn.GetState()) {
-			glog.V(4).Infof("Connection timed out")
-			// subsequent GetPluginInfo will show the real connection error
-			return conn, nil
-		}
-		if conn.GetState() == connectivity.Ready {
-			glog.V(3).Infof("Connected")
-			return conn, nil
-		}
-		glog.V(4).Infof("Still trying, connection is %s", conn.GetState())
-	}
-}
-
 func (c *csiConnection) GetDriverName(ctx context.Context) (string, error) {
 	client := csi.NewIdentityClient(c.conn)
 

pkg/connection/connection_test.go

@@ -50,7 +50,7 @@ func createMockServer(t *testing.T) (*gomock.Controller, *driver.MockCSIDriver,
 
 	// Create a client connection to it
 	addr := drv.Address()
-	csiConn, err := New(addr, 10)
+	csiConn, err := New(addr)
 	if err != nil {
 		return nil, nil, nil, nil, nil, err
 	}