ceph-csi/pkg/util/util.go
Madhu Rajanna 239822f147 reuse existing code for size Roundoff
This PR addresses the review comments in
https://github.com/ceph/ceph-csi/pull/644

Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
2019-10-11 11:07:39 +00:00

196 lines
5.8 KiB
Go

/*
Copyright 2019 The Ceph-CSI 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 util
import (
"context"
"math"
"os"
"path"
"strings"
"time"
"github.com/pkg/errors"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
"k8s.io/apimachinery/pkg/util/validation"
"k8s.io/klog"
"k8s.io/kubernetes/pkg/util/mount"
)
// remove this once kubernetes v1.14.0 release is done
// https://github.com/kubernetes/cloud-provider/blob/master/volume/helpers/rounding.go
const (
// MiB - MebiByte size
MiB = 1024 * 1024
GiB = MiB * 1024
)
// RoundOffVolSize rounds up given quantity upto chunks of MiB/GiB
func RoundOffVolSize(size int64) int64 {
size = RoundOffBytes(size)
// convert size back to MiB for rbd CLI
return size / MiB
}
// RoundOffBytes converts roundoff the size
// 1.1Mib will be round off to 2Mib same for GiB
// size less than 1MiB will be round off to 1MiB
func RoundOffBytes(bytes int64) int64 {
var num int64
floatBytes := float64(bytes)
// round off the value if its in decimal
if floatBytes < GiB {
num = int64(math.Ceil(floatBytes / MiB))
num *= MiB
} else {
num = int64(math.Ceil(floatBytes / GiB))
num *= GiB
}
return num
}
// variables which will be set during the build time
var (
// GitCommit tell the latest git commit image is built from
GitCommit string
// DriverVersion which will be driver version
DriverVersion string
)
// Config holds the parameters list which can be configured
type Config struct {
Vtype string // driver type [rbd|cephfs|liveness]
Endpoint string // CSI endpoint
DriverName string // name of the driver
NodeID string // node id
InstanceID string // unique ID distinguishing this instance of Ceph CSI
MetadataStorage string // metadata persistence method [node|k8s_configmap]
PluginPath string // location of cephcsi plugin
// cephfs related flags
MountCacheDir string // mount info cache save dir
// metrics related flags
MetricsPath string // path of prometheus endpoint where metrics will be available
HistogramOption string // Histogram option for grpc metrics, should be comma separated value, ex:= "0.5,2,6" where start=0.5 factor=2, count=6
MetricsIP string // TCP port for liveness/ metrics requests
PidLimit int // PID limit to configure through cgroups")
MetricsPort int // TCP port for liveness/grpc metrics requests
PollTime time.Duration // time interval in seconds between each poll
PoolTimeout time.Duration // probe timeout in seconds
EnableGRPCMetrics bool // option to enable grpc metrics
IsControllerServer bool // if set to true start provisoner server
IsNodeServer bool // if set to true start node server
// rbd related flag
Containerized bool // whether run as containerized
}
// CreatePersistanceStorage creates storage path and initializes new cache
func CreatePersistanceStorage(sPath, metaDataStore, pluginPath string) (CachePersister, error) {
var err error
if err = CreateMountPoint(path.Join(sPath, "controller")); err != nil {
klog.Errorf("failed to create persistent storage for controller: %v", err)
return nil, err
}
if err = CreateMountPoint(path.Join(sPath, "node")); err != nil {
klog.Errorf("failed to create persistent storage for node: %v", err)
return nil, err
}
cp, err := NewCachePersister(metaDataStore, pluginPath)
if err != nil {
klog.Errorf("failed to define cache persistence method: %v", err)
return nil, err
}
return cp, err
}
// ValidateDriverName validates the driver name
func ValidateDriverName(driverName string) error {
if driverName == "" {
return errors.New("driver name is empty")
}
if len(driverName) > 63 {
return errors.New("driver name length should be less than 63 chars")
}
var err error
for _, msg := range validation.IsDNS1123Subdomain(strings.ToLower(driverName)) {
if err == nil {
err = errors.New(msg)
continue
}
err = errors.Wrap(err, msg)
}
return err
}
// GenerateVolID generates a volume ID based on passed in parameters and version, to be returned
// to the CO system
func GenerateVolID(ctx context.Context, monitors string, cr *Credentials, pool, clusterID, objUUID string, volIDVersion uint16) (string, error) {
poolID, err := GetPoolID(ctx, monitors, cr, pool)
if err != nil {
return "", err
}
// generate the volume ID to return to the CO system
vi := CSIIdentifier{
LocationID: poolID,
EncodingVersion: volIDVersion,
ClusterID: clusterID,
ObjectUUID: objUUID,
}
volID, err := vi.ComposeCSIID()
return volID, err
}
// CreateMountPoint creates the directory with given path
func CreateMountPoint(mountPath string) error {
return os.MkdirAll(mountPath, 0750)
}
// checkDirExists checks directory exists or not
func checkDirExists(p string) bool {
if _, err := os.Stat(p); os.IsNotExist(err) {
return false
}
return true
}
// IsMountPoint checks if the given path is mountpoint or not
func IsMountPoint(p string) (bool, error) {
dummyMount := mount.New("")
notMnt, err := dummyMount.IsLikelyNotMountPoint(p)
if err != nil {
return false, status.Error(codes.Internal, err.Error())
}
return !notMnt, nil
}
// Mount mounts the source to target path
func Mount(source, target, fstype string, options []string) error {
dummyMount := mount.New("")
return dummyMount.Mount(source, target, fstype, options)
}