/
file.go
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/
file.go
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// Copyright 2019 Dolthub, Inc.
//
// 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 dbfactory
import (
"context"
"errors"
"fmt"
"net/url"
"os"
"path/filepath"
"sync"
"github.com/dolthub/dolt/go/libraries/doltcore/dconfig"
"github.com/dolthub/dolt/go/libraries/utils/filesys"
"github.com/dolthub/dolt/go/store/datas"
"github.com/dolthub/dolt/go/store/nbs"
"github.com/dolthub/dolt/go/store/prolly/tree"
"github.com/dolthub/dolt/go/store/types"
)
func init() {
// default to chunk journal unless feature flag is set
if os.Getenv(dconfig.EnvDisableChunkJournal) != "" {
chunkJournalFeatureFlag = false
}
}
var chunkJournalFeatureFlag = true
const (
// DoltDir defines the directory used to hold the dolt repo data within the filesys
DoltDir = ".dolt"
// DataDir is the directory internal to the DoltDir which holds the noms files.
DataDir = "noms"
ChunkJournalParam = "journal"
)
// DoltDataDir is the directory where noms files will be stored
var DoltDataDir = filepath.Join(DoltDir, DataDir)
// FileFactory is a DBFactory implementation for creating local filesys backed databases
type FileFactory struct {
}
type singletonDB struct {
ddb datas.Database
vrw types.ValueReadWriter
ns tree.NodeStore
}
var singletonLock = new(sync.Mutex)
var singletons = make(map[string]singletonDB)
func CloseAllLocalDatabases() (err error) {
singletonLock.Lock()
defer singletonLock.Unlock()
for name, s := range singletons {
if cerr := s.ddb.Close(); cerr != nil {
err = fmt.Errorf("error closing DB %s (%s)", name, cerr)
}
}
return
}
func DeleteFromSingletonCache(path string) error {
singletonLock.Lock()
defer singletonLock.Unlock()
delete(singletons, path)
return nil
}
// PrepareDB creates the directory for the DB if it doesn't exist, and returns an error if a file or symlink is at the
// path given
func (fact FileFactory) PrepareDB(ctx context.Context, nbf *types.NomsBinFormat, u *url.URL, params map[string]interface{}) error {
path, err := url.PathUnescape(u.Path)
if err != nil {
return err
}
path = filepath.FromSlash(path)
path = u.Host + path
info, err := os.Stat(path)
if os.IsNotExist(err) {
return os.MkdirAll(path, os.ModePerm)
}
if err != nil {
return err
} else if !info.IsDir() {
return filesys.ErrIsFile
}
return nil
}
// CreateDB creates a local filesys backed database
func (fact FileFactory) CreateDB(ctx context.Context, nbf *types.NomsBinFormat, urlObj *url.URL, params map[string]interface{}) (datas.Database, types.ValueReadWriter, tree.NodeStore, error) {
singletonLock.Lock()
defer singletonLock.Unlock()
if s, ok := singletons[urlObj.Path]; ok {
return s.ddb, s.vrw, s.ns, nil
}
path, err := url.PathUnescape(urlObj.Path)
if err != nil {
return nil, nil, nil, err
}
path = filepath.FromSlash(path)
path = urlObj.Host + path
err = validateDir(path)
if err != nil {
return nil, nil, nil, err
}
var useJournal bool
if params != nil {
_, useJournal = params[ChunkJournalParam]
}
var newGenSt *nbs.NomsBlockStore
q := nbs.NewUnlimitedMemQuotaProvider()
if useJournal && chunkJournalFeatureFlag {
newGenSt, err = nbs.NewLocalJournalingStore(ctx, nbf.VersionString(), path, q)
} else {
newGenSt, err = nbs.NewLocalStore(ctx, nbf.VersionString(), path, defaultMemTableSize, q)
}
if err != nil {
return nil, nil, nil, err
}
oldgenPath := filepath.Join(path, "oldgen")
err = validateDir(oldgenPath)
if err != nil {
if !errors.Is(err, os.ErrNotExist) {
return nil, nil, nil, err
}
err = os.Mkdir(oldgenPath, os.ModePerm)
if err != nil && !errors.Is(err, os.ErrExist) {
return nil, nil, nil, err
}
}
oldGenSt, err := nbs.NewLocalStore(ctx, newGenSt.Version(), oldgenPath, defaultMemTableSize, q)
if err != nil {
return nil, nil, nil, err
}
ghostGen, err := nbs.NewGhostBlockStore(path)
if err != nil {
return nil, nil, nil, err
}
st := nbs.NewGenerationalCS(oldGenSt, newGenSt, ghostGen)
// metrics?
vrw := types.NewValueStore(st)
ns := tree.NewNodeStore(st)
ddb := datas.NewTypesDatabase(vrw, ns)
singletons[urlObj.Path] = singletonDB{
ddb: ddb,
vrw: vrw,
ns: ns,
}
return ddb, vrw, ns, nil
}
func validateDir(path string) error {
info, err := os.Stat(path)
if err != nil {
return err
} else if !info.IsDir() {
return filesys.ErrIsFile
}
return nil
}