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gcs_fuse_driver.go
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gcs_fuse_driver.go
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/*
Copyright 2018 The Kubernetes Authors.
Copyright 2022 Google LLC
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
https://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 (
"errors"
"fmt"
csi "github.com/container-storage-interface/spec/lib/go/csi"
"github.com/googlecloudplatform/gcs-fuse-csi-driver/pkg/cloud_provider/auth"
"github.com/googlecloudplatform/gcs-fuse-csi-driver/pkg/cloud_provider/clientset"
"github.com/googlecloudplatform/gcs-fuse-csi-driver/pkg/cloud_provider/storage"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
"k8s.io/klog/v2"
"k8s.io/mount-utils"
)
const DefaultName = "gcsfuse.csi.storage.gke.io"
type GCSDriverConfig struct {
Name string // Driver name
Version string // Driver version
NodeID string // Node name
RunController bool // Run CSI controller service
RunNode bool // Run CSI node service
StorageServiceManager storage.ServiceManager
TokenManager auth.TokenManager
Mounter mount.Interface
K8sClients clientset.Interface
}
type GCSDriver struct {
config *GCSDriverConfig
// CSI RPC servers
ids csi.IdentityServer
ns csi.NodeServer
cs csi.ControllerServer
// Plugin capabilities
vcap map[csi.VolumeCapability_AccessMode_Mode]*csi.VolumeCapability_AccessMode
cscap []*csi.ControllerServiceCapability
nscap []*csi.NodeServiceCapability
}
func NewGCSDriver(config *GCSDriverConfig) (*GCSDriver, error) {
if config.Name == "" {
return nil, errors.New("driver name missing")
}
if config.Version == "" {
return nil, errors.New("driver version missing")
}
if !config.RunController && !config.RunNode {
return nil, errors.New("must run at least one controller or node service")
}
driver := &GCSDriver{
config: config,
vcap: map[csi.VolumeCapability_AccessMode_Mode]*csi.VolumeCapability_AccessMode{},
}
vcam := []csi.VolumeCapability_AccessMode_Mode{
csi.VolumeCapability_AccessMode_SINGLE_NODE_WRITER,
csi.VolumeCapability_AccessMode_SINGLE_NODE_READER_ONLY,
csi.VolumeCapability_AccessMode_MULTI_NODE_READER_ONLY,
csi.VolumeCapability_AccessMode_MULTI_NODE_SINGLE_WRITER,
csi.VolumeCapability_AccessMode_MULTI_NODE_MULTI_WRITER,
}
driver.addVolumeCapabilityAccessModes(vcam)
// Setup RPC servers
driver.ids = newIdentityServer(driver)
if config.RunNode {
nscap := []csi.NodeServiceCapability_RPC_Type{
csi.NodeServiceCapability_RPC_VOLUME_MOUNT_GROUP,
}
driver.ns = newNodeServer(driver, config.Mounter)
driver.addNodeServiceCapabilities(nscap)
}
if config.RunController {
csc := []csi.ControllerServiceCapability_RPC_Type{
csi.ControllerServiceCapability_RPC_CREATE_DELETE_VOLUME,
}
driver.addControllerServiceCapabilities(csc)
// Configure controller server
driver.cs = newControllerServer(driver, config.StorageServiceManager)
}
return driver, nil
}
func (driver *GCSDriver) addVolumeCapabilityAccessModes(vc []csi.VolumeCapability_AccessMode_Mode) {
for _, c := range vc {
klog.Infof("Enabling volume access mode: %v", c.String())
mode := NewVolumeCapabilityAccessMode(c)
driver.vcap[mode.GetMode()] = mode
}
}
func (driver *GCSDriver) validateVolumeCapabilities(caps []*csi.VolumeCapability) error {
if len(caps) == 0 {
return errors.New("volume capabilities must be provided")
}
for _, c := range caps {
if err := driver.validateVolumeCapability(c); err != nil {
return err
}
}
return nil
}
func (driver *GCSDriver) validateVolumeCapability(c *csi.VolumeCapability) error {
if c == nil {
return errors.New("volume capability must be provided")
}
// Validate access mode
accessMode := c.GetAccessMode()
if accessMode == nil {
return errors.New("volume capability access mode not set")
}
if driver.vcap[accessMode.GetMode()] == nil {
return fmt.Errorf("driver does not support access mode: %v", accessMode.GetMode().String())
}
// Validate access type
accessType := c.GetAccessType()
if accessType == nil {
return errors.New("volume capability access type not set")
}
if c.GetMount() == nil {
return errors.New("driver only supports mount access type volume capability")
}
return nil
}
func (driver *GCSDriver) addControllerServiceCapabilities(cl []csi.ControllerServiceCapability_RPC_Type) {
csc := []*csi.ControllerServiceCapability{}
for _, c := range cl {
klog.Infof("Enabling controller service capability: %v", c.String())
csc = append(csc, NewControllerServiceCapability(c))
}
driver.cscap = csc
}
func (driver *GCSDriver) addNodeServiceCapabilities(nl []csi.NodeServiceCapability_RPC_Type) {
nsc := []*csi.NodeServiceCapability{}
for _, n := range nl {
klog.Infof("Enabling node service capability: %v", n.String())
nsc = append(nsc, NewNodeServiceCapability(n))
}
driver.nscap = nsc
}
func (driver *GCSDriver) ValidateControllerServiceRequest(c csi.ControllerServiceCapability_RPC_Type) error {
if c == csi.ControllerServiceCapability_RPC_UNKNOWN {
return nil
}
for _, cap := range driver.cscap {
if c == cap.GetRpc().GetType() {
return nil
}
}
return status.Error(codes.InvalidArgument, "Invalid controller service request")
}
func (driver *GCSDriver) Run(endpoint string) {
klog.Infof("Running driver: %v", driver.config.Name)
s := NewNonBlockingGRPCServer()
s.Start(endpoint, driver.ids, driver.cs, driver.ns)
s.Wait()
}