seaweedfs/weed/filer/abstract_sql/abstract_sql_store.go
2021-01-19 18:07:29 -08:00

340 lines
9.2 KiB
Go

package abstract_sql
import (
"context"
"database/sql"
"fmt"
"github.com/chrislusf/seaweedfs/weed/filer"
"github.com/chrislusf/seaweedfs/weed/glog"
"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
"github.com/chrislusf/seaweedfs/weed/util"
"strings"
"sync"
)
type SqlGenerator interface {
GetSqlInsert(bucket string) string
GetSqlUpdate(bucket string) string
GetSqlFind(bucket string) string
GetSqlDelete(bucket string) string
GetSqlDeleteFolderChildren(bucket string) string
GetSqlListExclusive(bucket string) string
GetSqlListInclusive(bucket string) string
GetSqlCreateTable(bucket string) string
GetSqlDropTable(bucket string) string
}
type AbstractSqlStore struct {
SqlGenerator
DB *sql.DB
SupportBucketTable bool
dbs map[string]bool
dbsLock sync.Mutex
}
const (
DEFAULT_TABLE = "filemeta"
)
type TxOrDB interface {
ExecContext(ctx context.Context, query string, args ...interface{}) (sql.Result, error)
QueryRowContext(ctx context.Context, query string, args ...interface{}) *sql.Row
QueryContext(ctx context.Context, query string, args ...interface{}) (*sql.Rows, error)
}
func (store *AbstractSqlStore) BeginTransaction(ctx context.Context) (context.Context, error) {
tx, err := store.DB.BeginTx(ctx, &sql.TxOptions{
Isolation: sql.LevelReadCommitted,
ReadOnly: false,
})
if err != nil {
return ctx, err
}
return context.WithValue(ctx, "tx", tx), nil
}
func (store *AbstractSqlStore) CommitTransaction(ctx context.Context) error {
if tx, ok := ctx.Value("tx").(*sql.Tx); ok {
return tx.Commit()
}
return nil
}
func (store *AbstractSqlStore) RollbackTransaction(ctx context.Context) error {
if tx, ok := ctx.Value("tx").(*sql.Tx); ok {
return tx.Rollback()
}
return nil
}
func (store *AbstractSqlStore) getTxOrDB(ctx context.Context, fullpath util.FullPath, isForChildren bool) (txOrDB TxOrDB, bucket string, shortPath util.FullPath, err error) {
shortPath = fullpath
bucket = DEFAULT_TABLE
if tx, ok := ctx.Value("tx").(*sql.Tx); ok {
txOrDB = tx
} else {
txOrDB = store.DB
}
if !store.SupportBucketTable {
return
}
if !strings.HasPrefix(string(fullpath), "/buckets/") {
return
}
// detect bucket
bucketAndObjectKey := string(fullpath)[len("/buckets/"):]
t := strings.Index(bucketAndObjectKey, "/")
if t < 0 && !isForChildren {
return
}
bucket = bucketAndObjectKey
shortPath = "/"
if t > 0 {
bucket = bucketAndObjectKey[:t]
shortPath = util.FullPath(bucketAndObjectKey[t:])
}
if isValidBucket(bucket) {
store.dbsLock.Lock()
defer store.dbsLock.Unlock()
if store.dbs == nil {
store.dbs = make(map[string]bool)
}
if _, found := store.dbs[bucket]; !found {
if err = store.CreateTable(ctx, bucket); err != nil {
store.dbs[bucket] = true
}
}
}
return
}
func (store *AbstractSqlStore) InsertEntry(ctx context.Context, entry *filer.Entry) (err error) {
db, bucket, shortPath, err := store.getTxOrDB(ctx, entry.FullPath, false)
if err != nil {
return fmt.Errorf("findDB %s : %v", entry.FullPath, err)
}
dir, name := shortPath.DirAndName()
meta, err := entry.EncodeAttributesAndChunks()
if err != nil {
return fmt.Errorf("encode %s: %s", entry.FullPath, err)
}
if len(entry.Chunks) > 50 {
meta = util.MaybeGzipData(meta)
}
res, err := db.ExecContext(ctx, store.GetSqlInsert(bucket), util.HashStringToLong(dir), name, dir, meta)
if err == nil {
return
}
if !strings.Contains(strings.ToLower(err.Error()), "duplicate") {
// return fmt.Errorf("insert: %s", err)
// skip this since the error can be in a different language
}
// now the insert failed possibly due to duplication constraints
glog.V(1).Infof("insert %s falls back to update: %v", entry.FullPath, err)
res, err = db.ExecContext(ctx, store.GetSqlUpdate(bucket), meta, util.HashStringToLong(dir), name, dir)
if err != nil {
return fmt.Errorf("upsert %s: %s", entry.FullPath, err)
}
_, err = res.RowsAffected()
if err != nil {
return fmt.Errorf("upsert %s but no rows affected: %s", entry.FullPath, err)
}
return nil
}
func (store *AbstractSqlStore) UpdateEntry(ctx context.Context, entry *filer.Entry) (err error) {
db, bucket, shortPath, err := store.getTxOrDB(ctx, entry.FullPath, false)
if err != nil {
return fmt.Errorf("findDB %s : %v", entry.FullPath, err)
}
dir, name := shortPath.DirAndName()
meta, err := entry.EncodeAttributesAndChunks()
if err != nil {
return fmt.Errorf("encode %s: %s", entry.FullPath, err)
}
res, err := db.ExecContext(ctx, store.GetSqlUpdate(bucket), meta, util.HashStringToLong(dir), name, dir)
if err != nil {
return fmt.Errorf("update %s: %s", entry.FullPath, err)
}
_, err = res.RowsAffected()
if err != nil {
return fmt.Errorf("update %s but no rows affected: %s", entry.FullPath, err)
}
return nil
}
func (store *AbstractSqlStore) FindEntry(ctx context.Context, fullpath util.FullPath) (*filer.Entry, error) {
db, bucket, shortPath, err := store.getTxOrDB(ctx, fullpath, false)
if err != nil {
return nil, fmt.Errorf("findDB %s : %v", fullpath, err)
}
dir, name := shortPath.DirAndName()
row := db.QueryRowContext(ctx, store.GetSqlFind(bucket), util.HashStringToLong(dir), name, dir)
var data []byte
if err := row.Scan(&data); err != nil {
if err == sql.ErrNoRows {
return nil, filer_pb.ErrNotFound
}
return nil, fmt.Errorf("find %s: %v", fullpath, err)
}
entry := &filer.Entry{
FullPath: fullpath,
}
if err := entry.DecodeAttributesAndChunks(util.MaybeDecompressData(data)); err != nil {
return entry, fmt.Errorf("decode %s : %v", entry.FullPath, err)
}
return entry, nil
}
func (store *AbstractSqlStore) DeleteEntry(ctx context.Context, fullpath util.FullPath) error {
db, bucket, shortPath, err := store.getTxOrDB(ctx, fullpath, false)
if err != nil {
return fmt.Errorf("findDB %s : %v", fullpath, err)
}
dir, name := shortPath.DirAndName()
res, err := db.ExecContext(ctx, store.GetSqlDelete(bucket), util.HashStringToLong(dir), name, dir)
if err != nil {
return fmt.Errorf("delete %s: %s", fullpath, err)
}
_, err = res.RowsAffected()
if err != nil {
return fmt.Errorf("delete %s but no rows affected: %s", fullpath, err)
}
return nil
}
func (store *AbstractSqlStore) DeleteFolderChildren(ctx context.Context, fullpath util.FullPath) error {
db, bucket, shortPath, err := store.getTxOrDB(ctx, fullpath, true)
if err != nil {
return fmt.Errorf("findDB %s : %v", fullpath, err)
}
if isValidBucket(bucket) && shortPath == "/" {
if err = store.deleteTable(ctx, bucket); err == nil {
store.dbsLock.Lock()
delete(store.dbs, bucket)
store.dbsLock.Unlock()
return nil
} else {
return err
}
}
res, err := db.ExecContext(ctx, store.GetSqlDeleteFolderChildren(bucket), util.HashStringToLong(string(shortPath)), fullpath)
if err != nil {
return fmt.Errorf("deleteFolderChildren %s: %s", fullpath, err)
}
_, err = res.RowsAffected()
if err != nil {
return fmt.Errorf("deleteFolderChildren %s but no rows affected: %s", fullpath, err)
}
return nil
}
func (store *AbstractSqlStore) ListDirectoryPrefixedEntries(ctx context.Context, dirPath util.FullPath, startFileName string, includeStartFile bool, limit int64, prefix string, eachEntryFunc filer.ListEachEntryFunc) (lastFileName string, err error) {
db, bucket, shortPath, err := store.getTxOrDB(ctx, dirPath, true)
if err != nil {
return lastFileName, fmt.Errorf("findDB %s : %v", dirPath, err)
}
sqlText := store.GetSqlListExclusive(bucket)
if includeStartFile {
sqlText = store.GetSqlListInclusive(bucket)
}
rows, err := db.QueryContext(ctx, sqlText, util.HashStringToLong(string(shortPath)), startFileName, string(shortPath), prefix+"%", limit+1)
if err != nil {
return lastFileName, fmt.Errorf("list %s : %v", dirPath, err)
}
defer rows.Close()
for rows.Next() {
var name string
var data []byte
if err = rows.Scan(&name, &data); err != nil {
glog.V(0).Infof("scan %s : %v", dirPath, err)
return lastFileName, fmt.Errorf("scan %s: %v", dirPath, err)
}
lastFileName = name
entry := &filer.Entry{
FullPath: util.NewFullPath(string(dirPath), name),
}
if err = entry.DecodeAttributesAndChunks(util.MaybeDecompressData(data)); err != nil {
glog.V(0).Infof("scan decode %s : %v", entry.FullPath, err)
return lastFileName, fmt.Errorf("scan decode %s : %v", entry.FullPath, err)
}
if !eachEntryFunc(entry) {
break
}
}
return lastFileName, nil
}
func (store *AbstractSqlStore) ListDirectoryEntries(ctx context.Context, dirPath util.FullPath, startFileName string, includeStartFile bool, limit int64, eachEntryFunc filer.ListEachEntryFunc) (lastFileName string, err error) {
return store.ListDirectoryPrefixedEntries(ctx, dirPath, startFileName, includeStartFile, limit, "", nil)
}
func (store *AbstractSqlStore) Shutdown() {
store.DB.Close()
}
func isValidBucket(bucket string) bool {
return bucket != DEFAULT_TABLE && bucket != ""
}
func (store *AbstractSqlStore) CreateTable(ctx context.Context, bucket string) error {
if !store.SupportBucketTable {
return nil
}
_, err := store.DB.ExecContext(ctx, store.SqlGenerator.GetSqlCreateTable(bucket))
return err
}
func (store *AbstractSqlStore) deleteTable(ctx context.Context, bucket string) error {
if !store.SupportBucketTable {
return nil
}
_, err := store.DB.ExecContext(ctx, store.SqlGenerator.GetSqlDropTable(bucket))
return err
}