seaweedfs/weed/filer/etcd/etcd_store.go

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package etcd
import (
"bytes"
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"context"
"fmt"
"strings"
"time"
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"go.etcd.io/etcd/client/v3"
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"github.com/seaweedfs/seaweedfs/weed/filer"
"github.com/seaweedfs/seaweedfs/weed/glog"
"github.com/seaweedfs/seaweedfs/weed/pb/filer_pb"
weed_util "github.com/seaweedfs/seaweedfs/weed/util"
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)
const (
DIR_FILE_SEPARATOR = byte(0x00)
)
func init() {
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filer.Stores = append(filer.Stores, &EtcdStore{})
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}
type EtcdStore struct {
client *clientv3.Client
etcdKeyPrefix string
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}
func (store *EtcdStore) GetName() string {
return "etcd"
}
func (store *EtcdStore) Initialize(configuration weed_util.Configuration, prefix string) (err error) {
servers := configuration.GetString(prefix + "servers")
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if servers == "" {
servers = "localhost:2379"
}
username := configuration.GetString(prefix + "username")
password := configuration.GetString(prefix + "password")
store.etcdKeyPrefix = configuration.GetString(prefix + "key_prefix")
timeout := configuration.GetString(prefix + "timeout")
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if timeout == "" {
timeout = "3s"
}
return store.initialize(servers, username, password, timeout)
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}
func (store *EtcdStore) initialize(servers string, username string, password string, timeout string) (err error) {
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glog.Infof("filer store etcd: %s", servers)
to, err := time.ParseDuration(timeout)
if err != nil {
return fmt.Errorf("parse timeout %s: %s", timeout, err)
}
store.client, err = clientv3.New(clientv3.Config{
Endpoints: strings.Split(servers, ","),
Username: username,
Password: password,
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DialTimeout: to,
})
if err != nil {
return fmt.Errorf("connect to etcd %s: %s", servers, err)
}
return
}
func (store *EtcdStore) BeginTransaction(ctx context.Context) (context.Context, error) {
return ctx, nil
}
func (store *EtcdStore) CommitTransaction(ctx context.Context) error {
return nil
}
func (store *EtcdStore) RollbackTransaction(ctx context.Context) error {
return nil
}
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func (store *EtcdStore) InsertEntry(ctx context.Context, entry *filer.Entry) (err error) {
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key := genKey(entry.DirAndName())
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meta, err := entry.EncodeAttributesAndChunks()
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if err != nil {
return fmt.Errorf("encoding %s %+v: %v", entry.FullPath, entry.Attr, err)
}
if len(entry.GetChunks()) > filer.CountEntryChunksForGzip {
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meta = weed_util.MaybeGzipData(meta)
}
if _, err := store.client.Put(ctx, store.etcdKeyPrefix + string(key), string(meta)); err != nil {
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return fmt.Errorf("persisting %s : %v", entry.FullPath, err)
}
return nil
}
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func (store *EtcdStore) UpdateEntry(ctx context.Context, entry *filer.Entry) (err error) {
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return store.InsertEntry(ctx, entry)
}
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func (store *EtcdStore) FindEntry(ctx context.Context, fullpath weed_util.FullPath) (entry *filer.Entry, err error) {
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key := genKey(fullpath.DirAndName())
resp, err := store.client.Get(ctx, store.etcdKeyPrefix + string(key))
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if err != nil {
return nil, fmt.Errorf("get %s : %v", fullpath, err)
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}
if len(resp.Kvs) == 0 {
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return nil, filer_pb.ErrNotFound
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}
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entry = &filer.Entry{
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FullPath: fullpath,
}
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err = entry.DecodeAttributesAndChunks(weed_util.MaybeDecompressData(resp.Kvs[0].Value))
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if err != nil {
return entry, fmt.Errorf("decode %s : %v", entry.FullPath, err)
}
return entry, nil
}
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func (store *EtcdStore) DeleteEntry(ctx context.Context, fullpath weed_util.FullPath) (err error) {
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key := genKey(fullpath.DirAndName())
if _, err := store.client.Delete(ctx, store.etcdKeyPrefix + string(key)); err != nil {
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return fmt.Errorf("delete %s : %v", fullpath, err)
}
return nil
}
func (store *EtcdStore) DeleteFolderChildren(ctx context.Context, fullpath weed_util.FullPath) (err error) {
directoryPrefix := genDirectoryKeyPrefix(fullpath, "")
if _, err := store.client.Delete(ctx, store.etcdKeyPrefix + string(directoryPrefix), clientv3.WithPrefix()); err != nil {
return fmt.Errorf("deleteFolderChildren %s : %v", fullpath, err)
}
return nil
}
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func (store *EtcdStore) ListDirectoryPrefixedEntries(ctx context.Context, dirPath weed_util.FullPath, startFileName string, includeStartFile bool, limit int64, prefix string, eachEntryFunc filer.ListEachEntryFunc) (lastFileName string, err error) {
return lastFileName, filer.ErrUnsupportedListDirectoryPrefixed
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}
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func (store *EtcdStore) ListDirectoryEntries(ctx context.Context, dirPath weed_util.FullPath, startFileName string, includeStartFile bool, limit int64, eachEntryFunc filer.ListEachEntryFunc) (lastFileName string, err error) {
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directoryPrefix := genDirectoryKeyPrefix(dirPath, "")
lastFileStart := directoryPrefix
if startFileName != "" {
lastFileStart = genDirectoryKeyPrefix(dirPath, startFileName)
}
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resp, err := store.client.Get(ctx, store.etcdKeyPrefix + string(lastFileStart),
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clientv3.WithFromKey(), clientv3.WithLimit(limit+1))
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if err != nil {
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return lastFileName, fmt.Errorf("list %s : %v", dirPath, err)
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}
for _, kv := range resp.Kvs {
if !bytes.HasPrefix(kv.Key, directoryPrefix) {
break
}
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fileName := getNameFromKey(kv.Key)
if fileName == "" {
continue
}
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if fileName == startFileName && !includeStartFile {
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continue
}
limit--
if limit < 0 {
break
}
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entry := &filer.Entry{
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FullPath: weed_util.NewFullPath(string(dirPath), fileName),
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}
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if decodeErr := entry.DecodeAttributesAndChunks(weed_util.MaybeDecompressData(kv.Value)); decodeErr != nil {
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err = decodeErr
glog.V(0).Infof("list %s : %v", entry.FullPath, err)
break
}
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if !eachEntryFunc(entry) {
break
}
lastFileName = fileName
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}
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return lastFileName, err
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}
func genKey(dirPath, fileName string) (key []byte) {
key = []byte(dirPath)
key = append(key, DIR_FILE_SEPARATOR)
key = append(key, []byte(fileName)...)
return key
}
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func genDirectoryKeyPrefix(fullpath weed_util.FullPath, startFileName string) (keyPrefix []byte) {
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keyPrefix = []byte(string(fullpath))
keyPrefix = append(keyPrefix, DIR_FILE_SEPARATOR)
if len(startFileName) > 0 {
keyPrefix = append(keyPrefix, []byte(startFileName)...)
}
return keyPrefix
}
func getNameFromKey(key []byte) string {
sepIndex := len(key) - 1
for sepIndex >= 0 && key[sepIndex] != DIR_FILE_SEPARATOR {
sepIndex--
}
return string(key[sepIndex+1:])
}
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func (store *EtcdStore) Shutdown() {
store.client.Close()
}