github.com/zuoyebang/bitalosdb@v1.1.1-0.20240516111551-79a8c4d8ce20/bithash/checkpoint.go (about)

     1  // Copyright 2021 The Bitalosdb author(hustxrb@163.com) and other contributors.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package bithash
    16  
    17  import (
    18  	"os"
    19  	"path/filepath"
    20  
    21  	"github.com/cockroachdb/errors"
    22  	"github.com/cockroachdb/errors/oserror"
    23  	"github.com/zuoyebang/bitalosdb/internal/vfs"
    24  )
    25  
    26  func (b *Bithash) Checkpoint(fs vfs.FS, destDir string) (err error) {
    27  	if _, err = os.Stat(destDir); !oserror.IsNotExist(err) {
    28  		return errors.Errorf("bithash: checkpoint dir exist %s", destDir)
    29  	}
    30  
    31  	var dir vfs.File
    32  	err = os.Mkdir(destDir, 0755)
    33  	if err != nil {
    34  		return err
    35  	}
    36  	dir, err = fs.OpenDir(destDir)
    37  	if err != nil {
    38  		return err
    39  	}
    40  
    41  	if err = b.closeMutableWriters(); err != nil {
    42  		return err
    43  	}
    44  
    45  	manifest := MakeFilepath(fs, b.dirname, fileTypeManifest, 0)
    46  	destManifest := MakeFilepath(fs, destDir, fileTypeManifest, 0)
    47  	err = vfs.Copy(fs, manifest, destManifest)
    48  	if err != nil {
    49  		return err
    50  	}
    51  
    52  	fileNumMap := MakeFilepath(fs, b.dirname, fileTypeFileNumMap, 0)
    53  	destFileNumMap := MakeFilepath(fs, destDir, fileTypeFileNumMap, 0)
    54  	if err = vfs.Copy(fs, fileNumMap, destFileNumMap); err != nil {
    55  		return err
    56  	}
    57  
    58  	compactLog := MakeFilepath(fs, b.dirname, fileTypeCompactLog, 0)
    59  	destCompactLog := MakeFilepath(fs, destDir, fileTypeCompactLog, 0)
    60  	if err = vfs.Copy(fs, compactLog, destCompactLog); err != nil {
    61  		return err
    62  	}
    63  
    64  	copyTable := func() error {
    65  		b.meta.mu.RLock()
    66  		defer b.meta.mu.RUnlock()
    67  		for fn := range b.meta.mu.filesMeta {
    68  			filename := MakeFilepath(fs, b.dirname, fileTypeTable, fn)
    69  			if _, err = fs.Stat(filename); err != nil {
    70  				return err
    71  			}
    72  			err = vfs.LinkOrCopy(fs, filename, filepath.Join(destDir, fs.PathBase(filename)))
    73  			if err != nil {
    74  				return err
    75  			}
    76  		}
    77  		return nil
    78  	}
    79  	err = copyTable()
    80  	if err != nil {
    81  		return err
    82  	}
    83  
    84  	err = dir.Sync()
    85  	if err != nil {
    86  		return err
    87  	}
    88  	err = dir.Close()
    89  	dir = nil
    90  
    91  	return err
    92  }