/
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"
"net/url"
"os"
"path/filepath"
"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/types"
)
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"
)
// 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 {
}
// CreateDB creates an 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, error) {
path, err := url.PathUnescape(urlObj.Path)
if err != nil {
return nil, nil, err
}
path = filepath.FromSlash(path)
path = urlObj.Host + path
err = validateDir(path)
if err != nil {
return nil, nil, err
}
q := nbs.NewUnlimitedMemQuotaProvider()
newGenSt, err := nbs.NewLocalStore(ctx, nbf.VersionString(), path, defaultMemTableSize, q)
if err != nil {
return nil, nil, err
}
oldgenPath := filepath.Join(path, "oldgen")
err = validateDir(oldgenPath)
if err != nil {
if !errors.Is(err, os.ErrNotExist) {
return nil, nil, err
}
err = os.Mkdir(oldgenPath, os.ModePerm)
if err != nil && !errors.Is(err, os.ErrExist) {
return nil, nil, err
}
}
oldGenSt, err := nbs.NewLocalStore(ctx, newGenSt.Version(), oldgenPath, defaultMemTableSize, q)
if err != nil {
return nil, nil, err
}
st := nbs.NewGenerationalCS(oldGenSt, newGenSt)
// metrics?
vrw := types.NewValueStore(st)
return datas.NewTypesDatabase(vrw), vrw, 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
}