WIP

11 files changed, 671 insertions, 0 deletions

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..d132cb8
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+
+*.iml
diff --git a/cmd/seaweedfs-csi-driver/main.go b/cmd/seaweedfs-csi-driver/main.go
new file mode 100644
index 0000000..3919052
--- /dev/null
+++ b/cmd/seaweedfs-csi-driver/main.go
@@ -0,0 +1,33 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"log"
+	"os"
+
+	"github.com/seaweedfs/seaweedfs-csi-driver/pkg/driver"
+)
+
+var (
+	endpoint = flag.String("endpoint", "unix://tmp/seaweedfs-csi.sock", "CSI endpoint")
+	nodeID   = flag.String("nodeid", "", "node id")
+	version  = flag.Bool("version", false, "Print the version and exit.")
+)
+
+func main() {
+
+	flag.Parse()
+
+	if *version {
+		info, err := driver.GetVersionJSON()
+		if err != nil {
+			log.Fatalln(err.Error())
+		}
+		fmt.Println(info)
+		os.Exit(0)
+	}
+
+	drv := driver.NewSeaweedFsDriver(*nodeID, *endpoint)
+	drv.Run()
+}
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..3cb854e
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,11 @@
+module github.com/seaweedfs/seaweedfs-csi-driver
+
+go 1.14
+
+require (
+	github.com/container-storage-interface/spec v1.2.0
+	github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b
+	golang.org/x/net v0.0.0-20200301022130-244492dfa37a
+	google.golang.org/grpc v1.28.0
+	k8s.io/utils v0.0.0-20200318093247-d1ab8797c558
+)
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..5430653
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,64 @@
+cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
+github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
+github.com/cncf/udpa/go v0.0.0-20191209042840-269d4d468f6f/go.mod h1:M8M6+tZqaGXZJjfX53e64911xZQV5JYwmTeXPW+k8Sc=
+github.com/container-storage-interface/spec v1.2.0 h1:bD9KIVgaVKKkQ/UbVUY9kCaH/CJbhNxe0eeB4JeJV2s=
+github.com/container-storage-interface/spec v1.2.0/go.mod h1:6URME8mwIBbpVyZV93Ce5St17xBiQJQY67NDsuohiy4=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/envoyproxy/go-control-plane v0.9.0/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
+github.com/envoyproxy/go-control-plane v0.9.4/go.mod h1:6rpuAdCZL397s3pYoYcLgu1mIlRU8Am5FuJP05cCM98=
+github.com/envoyproxy/protoc-gen-validate v0.1.0/go.mod h1:iSmxcyjqTsJpI2R4NaDN7+kN2VEUnK/pcBlmesArF7c=
+github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b h1:VKtxabqXZkF25pY9ekfRL6a582T4P37/31XEstQ5p58=
+github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfUlaOkMMuAQtPIUF8ecWP5IEl/CR7VP2Q=
+github.com/golang/mock v1.1.1/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A=
+github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
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+github.com/google/go-cmp v0.2.0/go.mod h1:oXzfMopK8JAjlY9xF4vHSVASa0yLyX7SntLO5aqRK0M=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/prometheus/client_model v0.0.0-20190812154241-14fe0d1b01d4/go.mod h1:xMI15A0UPsDsEKsMN9yxemIoYk6Tm2C1GtYGdfGttqA=
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+golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
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+golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
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diff --git a/pkg/driver/controllerserver.go b/pkg/driver/controllerserver.go
new file mode 100644
index 0000000..e176866
--- /dev/null
+++ b/pkg/driver/controllerserver.go
@@ -0,0 +1,104 @@
+package driver
+
+import (
+	"context"
+
+	"github.com/container-storage-interface/spec/lib/go/csi"
+	"github.com/golang/glog"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/status"
+)
+
+type ControllerServer struct {
+	Driver *SeaweedFsDriver
+}
+
+var _ = csi.ControllerServer(&ControllerServer{})
+
+func (cs *ControllerServer) CreateVolume(ctx context.Context, req *csi.CreateVolumeRequest) (*csi.CreateVolumeResponse, error) {
+
+	volumeId := req.GetName()
+	params := req.GetParameters()
+	glog.V(4).Info("params:%v", params)
+	capacity := req.GetCapacityRange().GetRequiredBytes()
+	capacityGB := capacity >> 30
+	if capacityGB == 0 {
+		return nil, status.Error(codes.InvalidArgument, "required bytes less than 1GB")
+	}
+	seaweedFsVolumeCount := capacityGB / 30
+	if seaweedFsVolumeCount == 0 {
+		seaweedFsVolumeCount = 1
+	}
+
+	err := cs.Driver.createBucket(volumeId, int(seaweedFsVolumeCount))
+
+	return &csi.CreateVolumeResponse{
+		Volume: &csi.Volume{
+			VolumeId:      volumeId,
+			CapacityBytes: 0, // seaweedFsVolumeCount * 1024 * 1024 * 30,
+			VolumeContext: params,
+		},
+	}, err
+}
+
+func (cs *ControllerServer) DeleteVolume(ctx context.Context, req *csi.DeleteVolumeRequest) (*csi.DeleteVolumeResponse, error) {
+
+	volumeId := req.VolumeId
+	err := cs.Driver.deleteBucket(volumeId)
+
+	return &csi.DeleteVolumeResponse{}, err
+}
+
+func (cs *ControllerServer) ControllerPublishVolume(ctx context.Context, req *csi.ControllerPublishVolumeRequest) (*csi.ControllerPublishVolumeResponse, error) {
+	return nil, status.Error(codes.Unimplemented, "")
+}
+
+func (cs *ControllerServer) ControllerUnpublishVolume(ctx context.Context, req *csi.ControllerUnpublishVolumeRequest) (*csi.ControllerUnpublishVolumeResponse, error) {
+	return nil, status.Error(codes.Unimplemented, "")
+}
+
+func (cs *ControllerServer) ValidateVolumeCapabilities(ctx context.Context, req *csi.ValidateVolumeCapabilitiesRequest) (*csi.ValidateVolumeCapabilitiesResponse, error) {
+
+	return &csi.ValidateVolumeCapabilitiesResponse{
+		Confirmed: &csi.ValidateVolumeCapabilitiesResponse_Confirmed{
+			VolumeContext:      req.GetVolumeContext(),
+			VolumeCapabilities: req.GetVolumeCapabilities(),
+			Parameters:         req.GetParameters(),
+		},
+	}, nil
+
+}
+
+func (cs *ControllerServer) ListVolumes(ctx context.Context, req *csi.ListVolumesRequest) (*csi.ListVolumesResponse, error) {
+	return nil, status.Error(codes.Unimplemented, "")
+}
+
+func (cs *ControllerServer) GetCapacity(ctx context.Context, req *csi.GetCapacityRequest) (*csi.GetCapacityResponse, error) {
+	return nil, status.Error(codes.Unimplemented, "")
+}
+
+// ControllerGetCapabilities implements the default GRPC callout.
+// Default supports all capabilities
+func (cs *ControllerServer) ControllerGetCapabilities(ctx context.Context, req *csi.ControllerGetCapabilitiesRequest) (*csi.ControllerGetCapabilitiesResponse, error) {
+	glog.V(5).Infof("Using default ControllerGetCapabilities")
+
+	return &csi.ControllerGetCapabilitiesResponse{
+		Capabilities: cs.Driver.cscap,
+	}, nil
+}
+
+func (cs *ControllerServer) CreateSnapshot(ctx context.Context, req *csi.CreateSnapshotRequest) (*csi.CreateSnapshotResponse, error) {
+	return nil, status.Error(codes.Unimplemented, "")
+}
+
+func (cs *ControllerServer) DeleteSnapshot(ctx context.Context, req *csi.DeleteSnapshotRequest) (*csi.DeleteSnapshotResponse, error) {
+	return nil, status.Error(codes.Unimplemented, "")
+}
+
+func (cs *ControllerServer) ListSnapshots(ctx context.Context, req *csi.ListSnapshotsRequest) (*csi.ListSnapshotsResponse, error) {
+	return nil, status.Error(codes.Unimplemented, "")
+}
+
+func (cs *ControllerServer) ControllerExpandVolume(ctx context.Context, req *csi.ControllerExpandVolumeRequest) (*csi.ControllerExpandVolumeResponse, error) {
+	return nil, status.Error(codes.Unimplemented, "")
+}
diff --git a/pkg/driver/driver.go b/pkg/driver/driver.go
new file mode 100644
index 0000000..d090613
--- /dev/null
+++ b/pkg/driver/driver.go
@@ -0,0 +1,102 @@
+package driver
+
+import (
+	"github.com/container-storage-interface/spec/lib/go/csi"
+	"github.com/golang/glog"
+)
+
+const (
+	driverName = "csi.seaweedfs.com"
+)
+
+var (
+	version = "1.0.0-rc1"
+)
+
+type SeaweedFsDriver struct {
+	name    string
+	nodeID  string
+	version string
+
+	endpoint string
+
+	vcap  []*csi.VolumeCapability_AccessMode
+	cscap []*csi.ControllerServiceCapability
+
+	filer       string
+	pathOnFiler string
+}
+
+func NewSeaweedFsDriver(nodeID, endpoint string) *SeaweedFsDriver {
+
+	glog.Infof("Driver: %v version: %v", driverName, version)
+
+	n := &SeaweedFsDriver{
+		endpoint: endpoint,
+		nodeID:   nodeID,
+		name:     driverName,
+		version:  version,
+	}
+
+	n.AddVolumeCapabilityAccessModes([]csi.VolumeCapability_AccessMode_Mode{
+		csi.VolumeCapability_AccessMode_MULTI_NODE_MULTI_WRITER,
+	})
+	n.AddControllerServiceCapabilities([]csi.ControllerServiceCapability_RPC_Type{
+		csi.ControllerServiceCapability_RPC_CREATE_DELETE_VOLUME,
+	})
+
+	return n
+}
+
+func NewNodeServer(n *SeaweedFsDriver) *NodeServer {
+
+	return &NodeServer{
+		Driver: n,
+	}
+}
+
+func (n *SeaweedFsDriver) Run() {
+	s := NewNonBlockingGRPCServer()
+	s.Start(n.endpoint,
+		NewIdentityServer(n),
+		NewControllerServer(n),
+		NewNodeServer(n))
+	s.Wait()
+}
+
+func (n *SeaweedFsDriver) AddVolumeCapabilityAccessModes(vc []csi.VolumeCapability_AccessMode_Mode) []*csi.VolumeCapability_AccessMode {
+	var vca []*csi.VolumeCapability_AccessMode
+	for _, c := range vc {
+		glog.Infof("Enabling volume access mode: %v", c.String())
+		vca = append(vca, &csi.VolumeCapability_AccessMode{Mode: c})
+	}
+	n.vcap = vca
+	return vca
+}
+
+func (n *SeaweedFsDriver) AddControllerServiceCapabilities(cl []csi.ControllerServiceCapability_RPC_Type) {
+	var csc []*csi.ControllerServiceCapability
+
+	for _, c := range cl {
+		glog.Infof("Enabling controller service capability: %v", c.String())
+		csc = append(csc, NewControllerServiceCapability(c))
+	}
+
+	n.cscap = csc
+
+	return
+}
+
+func (n *SeaweedFsDriver) createBucket(volumeId string, seaweedFsVolumeCount int) error {
+	// TODO implement seaweedFsVolumeCount later
+	return nil
+}
+func (n *SeaweedFsDriver) deleteBucket(volumeId string) error {
+	return nil
+}
+func (n *SeaweedFsDriver) mount(source string, targetPath string) error {
+	return nil
+}
+func (n *SeaweedFsDriver) unmount(targetPath string) error {
+	return nil
+}
diff --git a/pkg/driver/identityserver.go b/pkg/driver/identityserver.go
new file mode 100644
index 0000000..f92b225
--- /dev/null
+++ b/pkg/driver/identityserver.go
@@ -0,0 +1,49 @@
+package driver
+
+import (
+	"github.com/container-storage-interface/spec/lib/go/csi"
+	"github.com/golang/glog"
+	"golang.org/x/net/context"
+)
+
+type IdentityServer struct {
+	Driver *SeaweedFsDriver
+}
+
+var _ = csi.IdentityServer(&IdentityServer{})
+
+func (ids *IdentityServer) GetPluginInfo(ctx context.Context, req *csi.GetPluginInfoRequest) (*csi.GetPluginInfoResponse, error) {
+
+	return &csi.GetPluginInfoResponse{
+		Name:          ids.Driver.name,
+		VendorVersion: ids.Driver.version,
+	}, nil
+}
+
+func (ids *IdentityServer) Probe(ctx context.Context, req *csi.ProbeRequest) (*csi.ProbeResponse, error) {
+	return &csi.ProbeResponse{}, nil
+}
+
+func (ids *IdentityServer) GetPluginCapabilities(ctx context.Context, req *csi.GetPluginCapabilitiesRequest) (*csi.GetPluginCapabilitiesResponse, error) {
+	glog.V(4).Infof("Using default capabilities")
+	return &csi.GetPluginCapabilitiesResponse{
+		Capabilities: []*csi.PluginCapability{
+			{
+				Type: &csi.PluginCapability_Service_{
+					Service: &csi.PluginCapability_Service{
+						Type: csi.PluginCapability_Service_CONTROLLER_SERVICE,
+					},
+				},
+			},
+			/* // TODO add later
+				{
+					Type: &csi.PluginCapability_VolumeExpansion_{
+						VolumeExpansion: &csi.PluginCapability_VolumeExpansion{
+							Type: csi.PluginCapability_VolumeExpansion_ONLINE,
+						},
+					},
+				},
+			*/
+		},
+	}, nil
+}
diff --git a/pkg/driver/nodeserver.go b/pkg/driver/nodeserver.go
new file mode 100644
index 0000000..abef4a4
--- /dev/null
+++ b/pkg/driver/nodeserver.go
@@ -0,0 +1,105 @@
+package driver
+
+import (
+	"context"
+	"fmt"
+	"os"
+	"strings"
+
+	"github.com/golang/glog"
+
+	"github.com/container-storage-interface/spec/lib/go/csi"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/status"
+	"k8s.io/utils/mount"
+)
+
+type NodeServer struct {
+	Driver  *SeaweedFsDriver
+	mounter mount.Interface
+}
+
+var _ = csi.NodeServer(&NodeServer{})
+
+func (ns *NodeServer) NodePublishVolume(ctx context.Context, req *csi.NodePublishVolumeRequest) (*csi.NodePublishVolumeResponse, error) {
+	// mount the fs here
+	targetPath := req.GetTargetPath()
+
+	mo := req.GetVolumeCapability().GetMount().GetMountFlags()
+	if req.GetReadonly() {
+		mo = append(mo, "ro")
+	}
+
+	source := fmt.Sprintf("%s%s", ns.Driver.filer, ns.Driver.pathOnFiler)
+
+	err := ns.Driver.mount(source, targetPath)
+
+	if err != nil {
+		if os.IsPermission(err) {
+			return nil, status.Error(codes.PermissionDenied, err.Error())
+		}
+		if strings.Contains(err.Error(), "invalid argument") {
+			return nil, status.Error(codes.InvalidArgument, err.Error())
+		}
+		return nil, status.Error(codes.Internal, err.Error())
+	}
+
+	return &csi.NodePublishVolumeResponse{}, nil
+}
+
+func (ns *NodeServer) NodeUnpublishVolume(ctx context.Context, req *csi.NodeUnpublishVolumeRequest) (*csi.NodeUnpublishVolumeResponse, error) {
+	targetPath := req.GetTargetPath()
+
+	err := ns.Driver.unmount(targetPath)
+
+	if err != nil {
+		return nil, status.Error(codes.Internal, err.Error())
+	}
+
+	err = os.Remove(targetPath)
+	if err != nil && !os.IsNotExist(err) {
+		return nil, status.Error(codes.Internal, err.Error())
+	}
+
+	return &csi.NodeUnpublishVolumeResponse{}, nil
+}
+
+func (ns *NodeServer) NodeGetInfo(ctx context.Context, req *csi.NodeGetInfoRequest) (*csi.NodeGetInfoResponse, error) {
+	glog.V(5).Infof("Using default NodeGetInfo")
+
+	return &csi.NodeGetInfoResponse{
+		NodeId: ns.Driver.nodeID,
+	}, nil
+}
+
+func (ns *NodeServer) NodeGetCapabilities(ctx context.Context, req *csi.NodeGetCapabilitiesRequest) (*csi.NodeGetCapabilitiesResponse, error) {
+	glog.V(5).Infof("Using default NodeGetCapabilities")
+
+	return &csi.NodeGetCapabilitiesResponse{
+		Capabilities: []*csi.NodeServiceCapability{
+			{
+				Type: &csi.NodeServiceCapability_Rpc{
+					Rpc: &csi.NodeServiceCapability_RPC{
+						Type: csi.NodeServiceCapability_RPC_UNKNOWN,
+					},
+				},
+			},
+		},
+	}, nil
+}
+
+func (ns *NodeServer) NodeGetVolumeStats(ctx context.Context, in *csi.NodeGetVolumeStatsRequest) (*csi.NodeGetVolumeStatsResponse, error) {
+	return nil, status.Error(codes.Unimplemented, "")
+}
+
+func (ns *NodeServer) NodeUnstageVolume(ctx context.Context, req *csi.NodeUnstageVolumeRequest) (*csi.NodeUnstageVolumeResponse, error) {
+	return &csi.NodeUnstageVolumeResponse{}, nil
+}
+
+func (ns *NodeServer) NodeStageVolume(ctx context.Context, req *csi.NodeStageVolumeRequest) (*csi.NodeStageVolumeResponse, error) {
+	return &csi.NodeStageVolumeResponse{}, nil
+}
+
+func (ns *NodeServer) NodeExpandVolume(ctx context.Context, req *csi.NodeExpandVolumeRequest) (*csi.NodeExpandVolumeResponse, error) {
+	return nil, status.Error(codes.Unimplemented, "")
+}
diff --git a/pkg/driver/server.go b/pkg/driver/server.go
new file mode 100644
index 0000000..64a9333
--- /dev/null
+++ b/pkg/driver/server.go
@@ -0,0 +1,96 @@
+package driver
+
+import (
+	"net"
+	"os"
+	"sync"
+
+	"github.com/golang/glog"
+	"google.golang.org/grpc"
+
+	"github.com/container-storage-interface/spec/lib/go/csi"
+)
+
+// Defines Non blocking GRPC server interfaces
+type NonBlockingGRPCServer interface {
+	// Start services at the endpoint
+	Start(endpoint string, ids csi.IdentityServer, cs csi.ControllerServer, ns csi.NodeServer)
+	// Waits for the service to stop
+	Wait()
+	// Stops the service gracefully
+	Stop()
+	// Stops the service forcefully
+	ForceStop()
+}
+
+func NewNonBlockingGRPCServer() NonBlockingGRPCServer {
+	return &nonBlockingGRPCServer{}
+}
+
+// NonBlocking server
+type nonBlockingGRPCServer struct {
+	wg     sync.WaitGroup
+	server *grpc.Server
+}
+
+func (s *nonBlockingGRPCServer) Start(endpoint string, ids csi.IdentityServer, cs csi.ControllerServer, ns csi.NodeServer) {
+
+	s.wg.Add(1)
+
+	go s.serve(endpoint, ids, cs, ns)
+
+	return
+}
+
+func (s *nonBlockingGRPCServer) Wait() {
+	s.wg.Wait()
+}
+
+func (s *nonBlockingGRPCServer) Stop() {
+	s.server.GracefulStop()
+}
+
+func (s *nonBlockingGRPCServer) ForceStop() {
+	s.server.Stop()
+}
+
+func (s *nonBlockingGRPCServer) serve(endpoint string, ids csi.IdentityServer, cs csi.ControllerServer, ns csi.NodeServer) {
+
+	proto, addr, err := ParseEndpoint(endpoint)
+	if err != nil {
+		glog.Fatal(err.Error())
+	}
+
+	if proto == "unix" {
+		addr = "/" + addr
+		if err := os.Remove(addr); err != nil && !os.IsNotExist(err) {
+			glog.Fatalf("Failed to remove %s, error: %s", addr, err.Error())
+		}
+	}
+
+	listener, err := net.Listen(proto, addr)
+	if err != nil {
+		glog.Fatalf("Failed to listen: %v", err)
+	}
+
+	opts := []grpc.ServerOption{
+		grpc.UnaryInterceptor(logGRPC),
+	}
+	server := grpc.NewServer(opts...)
+	s.server = server
+
+	if ids != nil {
+		csi.RegisterIdentityServer(server, ids)
+	}
+	if cs != nil {
+		csi.RegisterControllerServer(server, cs)
+	}
+	if ns != nil {
+		csi.RegisterNodeServer(server, ns)
+	}
+
+	glog.Infof("Listening for connections on address: %#v", listener.Addr())
+
+	server.Serve(listener)
+
+}
\ No newline at end of file
diff --git a/pkg/driver/utils.go b/pkg/driver/utils.go
new file mode 100644
index 0000000..2334e27
--- /dev/null
+++ b/pkg/driver/utils.go
@@ -0,0 +1,52 @@
+package driver
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/container-storage-interface/spec/lib/go/csi"
+	"github.com/golang/glog"
+	"golang.org/x/net/context"
+	"google.golang.org/grpc"
+)
+
+func NewIdentityServer(d *SeaweedFsDriver) *IdentityServer {
+	return &IdentityServer{
+		Driver: d,
+	}
+}
+
+func NewControllerServer(d *SeaweedFsDriver) *ControllerServer {
+	return &ControllerServer{
+		Driver: d,
+	}
+}
+
+func NewControllerServiceCapability(cap csi.ControllerServiceCapability_RPC_Type) *csi.ControllerServiceCapability {
+	return &csi.ControllerServiceCapability{
+		Type: &csi.ControllerServiceCapability_Rpc{
+			Rpc: &csi.ControllerServiceCapability_RPC{
+				Type: cap,
+			},
+		},
+	}
+}
+
+func ParseEndpoint(ep string) (string, string, error) {
+	if strings.HasPrefix(strings.ToLower(ep), "unix://") || strings.HasPrefix(strings.ToLower(ep), "tcp://") {
+		s := strings.SplitN(ep, "://", 2)
+		if s[1] != "" {
+			return s[0], s[1], nil
+		}
+	}
+	return "", "", fmt.Errorf("Invalid endpoint: %v", ep)
+}
+
+func logGRPC(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (interface{}, error) {
+	glog.V(3).Infof("GRPC call: %s", info.FullMethod)
+	resp, err := handler(ctx, req)
+	if err != nil {
+		glog.Errorf("GRPC error: %v", err)
+	}
+	return resp, err
+}
diff --git a/pkg/driver/version.go b/pkg/driver/version.go
new file mode 100644
index 0000000..258267a
--- /dev/null
+++ b/pkg/driver/version.go
@@ -0,0 +1,53 @@
+/*
+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 driver
+
+import (
+	"encoding/json"
+	"fmt"
+	"runtime"
+)
+
+var (
+	driverVersion string
+	gitCommit     string
+	buildDate     string
+)
+
+type VersionInfo struct {
+	DriverVersion string `json:"driverVersion"`
+	GitCommit     string `json:"gitCommit"`
+	BuildDate     string `json:"buildDate"`
+	GoVersion     string `json:"goVersion"`
+	Compiler      string `json:"compiler"`
+	Platform      string `json:"platform"`
+}
+
+func GetVersion() VersionInfo {
+	return VersionInfo{
+		DriverVersion: driverVersion,
+		GitCommit:     gitCommit,
+		BuildDate:     buildDate,
+		GoVersion:     runtime.Version(),
+		Compiler:      runtime.Compiler,
+		Platform:      fmt.Sprintf("%s/%s", runtime.GOOS, runtime.GOARCH),
+	}
+}
+func GetVersionJSON() (string, error) {
+	info := GetVersion()
+	marshalled, err := json.MarshalIndent(&info, "", "  ")
+	if err != nil {
+		return "", err
+	}
+	return string(marshalled), nil
+}