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ceph.go
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ceph.go
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// Package cephbackupstorage implements the BackupStorage interface
// for Ceph Cloud Storage.
package cephbackupstorage
import (
"encoding/json"
"flag"
"fmt"
"io"
"os"
"sort"
"strings"
"sync"
"errors"
log "github.com/golang/glog"
minio "github.com/minio/minio-go"
"golang.org/x/net/context"
"github.com/youtube/vitess/go/vt/concurrency"
"github.com/youtube/vitess/go/vt/mysqlctl/backupstorage"
)
var (
// configFilePath is where the configs/credentials for backups will be stored.
configFilePath = flag.String("ceph_backup_storage_config", "ceph_backup_config.json",
"Path to JSON config file for ceph backup storage")
)
var storageConfig struct {
AccessKey string `json:"accessKey"`
SecretKey string `json:"secretKey"`
EndPoint string `json:"endPoint"`
UseSSL bool `json:"useSSL"`
}
// CephBackupHandle implements BackupHandle for Ceph Cloud Storage.
type CephBackupHandle struct {
client *minio.Client
bs *CephBackupStorage
dir string
name string
readOnly bool
errors concurrency.AllErrorRecorder
waitGroup sync.WaitGroup
}
// Directory implements BackupHandle.
func (bh *CephBackupHandle) Directory() string {
return bh.dir
}
// Name implements BackupHandle.
func (bh *CephBackupHandle) Name() string {
return bh.name
}
// AddFile implements BackupHandle.
func (bh *CephBackupHandle) AddFile(ctx context.Context, filename string) (io.WriteCloser, error) {
if bh.readOnly {
return nil, fmt.Errorf("AddFile cannot be called on read-only backup")
}
reader, writer := io.Pipe()
bh.waitGroup.Add(1)
go func() {
defer bh.waitGroup.Done()
// ceph bucket name is where the backups will go
//backup handle dir field contains keyspace/shard value
bucket := alterBucketName(bh.dir)
// Give PutObject() the read end of the pipe.
object := objName(bh.dir, bh.name, filename)
_, err := bh.client.PutObject(bucket, object, reader, "application/octet-stream")
if err != nil {
// Signal the writer that an error occurred, in case it's not done writing yet.
reader.CloseWithError(err)
// In case the error happened after the writer finished, we need to remember it.
bh.errors.RecordError(err)
}
}()
// Give our caller the write end of the pipe.
return writer, nil
}
// EndBackup implements BackupHandle.
func (bh *CephBackupHandle) EndBackup(ctx context.Context) error {
if bh.readOnly {
return fmt.Errorf("EndBackup cannot be called on read-only backup")
}
bh.waitGroup.Wait()
// Return the saved PutObject() errors, if any.
return bh.errors.Error()
}
// AbortBackup implements BackupHandle.
func (bh *CephBackupHandle) AbortBackup(ctx context.Context) error {
if bh.readOnly {
return fmt.Errorf("AbortBackup cannot be called on read-only backup")
}
return bh.bs.RemoveBackup(ctx, bh.dir, bh.name)
}
// ReadFile implements BackupHandle.
func (bh *CephBackupHandle) ReadFile(ctx context.Context, filename string) (io.ReadCloser, error) {
if !bh.readOnly {
return nil, fmt.Errorf("ReadFile cannot be called on read-write backup")
}
// ceph bucket name
bucket := alterBucketName(bh.dir)
object := objName(bh.dir, bh.name, filename)
return bh.client.GetObject(bucket, object)
}
// CephBackupStorage implements BackupStorage for Ceph Cloud Storage.
type CephBackupStorage struct {
// client is the instance of the Ceph Cloud Storage Go client.
// Once this field is set, it must not be written again/unset to nil.
_client *minio.Client
// mu guards all fields.
mu sync.Mutex
}
// ListBackups implements BackupStorage.
func (bs *CephBackupStorage) ListBackups(ctx context.Context, dir string) ([]backupstorage.BackupHandle, error) {
c, err := bs.client()
if err != nil {
return nil, err
}
// ceph bucket name
bucket := alterBucketName(dir)
// List prefixes that begin with dir (i.e. list subdirs).
var subdirs []string
searchPrefix := objName(dir, "")
doneCh := make(chan struct{})
for object := range c.ListObjects(bucket, searchPrefix, false, doneCh) {
if object.Err != nil {
err := c.BucketExists(bucket)
if err != nil {
return nil, nil
}
return nil, object.Err
}
subdir := strings.TrimPrefix(object.Key, searchPrefix)
subdir = strings.TrimSuffix(subdir, "/")
subdirs = append(subdirs, subdir)
}
// Backups must be returned in order, oldest first.
sort.Strings(subdirs)
result := make([]backupstorage.BackupHandle, 0, len(subdirs))
for _, subdir := range subdirs {
result = append(result, &CephBackupHandle{
client: c,
bs: bs,
dir: dir,
name: subdir,
readOnly: true,
})
}
return result, nil
}
// StartBackup implements BackupStorage.
func (bs *CephBackupStorage) StartBackup(ctx context.Context, dir, name string) (backupstorage.BackupHandle, error) {
c, err := bs.client()
if err != nil {
return nil, err
}
// ceph bucket name
bucket := alterBucketName(dir)
err = c.BucketExists(bucket)
if err != nil {
log.Info("Bucket: %v doesn't exist, creating new bucket with the required name", bucket)
err = c.MakeBucket(bucket, "")
if err != nil {
log.Info("Error creating Bucket: %v, quitting", bucket)
return nil, errors.New("Error creating new bucket: " + bucket)
}
}
return &CephBackupHandle{
client: c,
bs: bs,
dir: dir,
name: name,
readOnly: false,
}, nil
}
// RemoveBackup implements BackupStorage.
func (bs *CephBackupStorage) RemoveBackup(ctx context.Context, dir, name string) error {
c, err := bs.client()
if err != nil {
return err
}
// ceph bucket name
bucket := alterBucketName(dir)
fullName := objName(dir, name, "")
var arr []string
doneCh := make(chan struct{})
defer close(doneCh)
for object := range c.ListObjects(bucket, fullName, true, doneCh) {
if object.Err != nil {
return object.Err
}
arr = append(arr, object.Key)
}
for _, obj := range arr {
err = c.RemoveObject(bucket, obj)
if err != nil {
return err
}
}
return nil
}
// Close implements BackupStorage.
func (bs *CephBackupStorage) Close() error {
bs.mu.Lock()
defer bs.mu.Unlock()
if bs._client != nil {
// a new client the next time one is needed.
bs._client = nil
}
return nil
}
// client returns the Ceph Storage client instance.
// If there isn't one yet, it tries to create one.
func (bs *CephBackupStorage) client() (*minio.Client, error) {
bs.mu.Lock()
defer bs.mu.Unlock()
if bs._client == nil {
configFile, err := os.Open(*configFilePath)
if err != nil {
return nil, fmt.Errorf("file not present : %v", err)
}
defer configFile.Close()
jsonParser := json.NewDecoder(configFile)
if err = jsonParser.Decode(&storageConfig); err != nil {
return nil, fmt.Errorf("Error parsing the json file : %v", err)
}
accessKey := storageConfig.AccessKey
secretKey := storageConfig.SecretKey
url := storageConfig.EndPoint
useSSL := storageConfig.UseSSL
client, err := minio.NewV2(url, accessKey, secretKey, useSSL)
if err != nil {
return nil, err
}
bs._client = client
}
return bs._client, nil
}
func init() {
backupstorage.BackupStorageMap["ceph"] = &CephBackupStorage{}
}
// objName joins path parts into an object name.
// Unlike path.Join, it doesn't collapse ".." or strip trailing slashes.
// It also adds the value of the -gcs_backup_storage_root flag if set.
func objName(parts ...string) string {
return strings.Join(parts, "/")
}
// keeping in view the bucket naming conventions for ceph
// only keyspace informations is extracted and used for bucket name
func alterBucketName(dir string) string {
bucket := strings.ToLower(dir)
bucket = strings.Split(bucket, "/")[0]
bucket = strings.Replace(bucket, "_", "-", -1)
return bucket
}