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deleter.go
97 lines (90 loc) · 1.8 KB
/
deleter.go
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package leveldb
import (
"bufio"
"fmt"
"os"
"path/filepath"
"strings"
)
type Deleter interface {
scheduleDeletion(filesToDelete []string) error
deleteScheduled() error
}
type dbDeleter struct {
path string
file *os.File
}
type nullDeleter struct {
}
func (d *nullDeleter) scheduleDeletion(filesToDelete []string) error {
return nil
}
func (d *nullDeleter) deleteScheduled() error {
return nil
}
func newNullDeleter() Deleter {
return &nullDeleter{}
}
func newDeleter(path string) Deleter {
return &dbDeleter{
path: path,
}
}
func (d *dbDeleter) scheduleDeletion(filesToDelete []string) error {
if len(filesToDelete) == 0 {
return nil;
}
if d.file == nil {
file, err := os.OpenFile(filepath.Join(d.path, "deleted"), os.O_WRONLY|os.O_APPEND|os.O_CREATE|os.O_SYNC, 0600)
if err != nil {
return err
}
d.file = file
}
//fmt.Printf("%s,%s\n", ifExists, strings.Join(filesToDelete, ","))
_, err := fmt.Fprintf(d.file, "%s\n", strings.Join(filesToDelete, ","))
return err
}
func (d *dbDeleter) deleteScheduled() error {
if d.file != nil {
err := d.file.Close()
if err != nil {
return err
}
d.file = nil
}
filename := filepath.Join(d.path, "deleted")
f, err := os.OpenFile(filename, os.O_RDONLY, 0)
if err != nil {
if os.IsNotExist(err) {
return nil
}
return err
}
s := bufio.NewScanner(f)
for s.Scan() {
line := s.Text()
// if line=="" {
// continue;
// }
//fmt.Println("deleted:", line)
files := strings.Split(line, ",")
for _, file := range files {
path := filepath.Join(d.path, file)
err := os.Remove(path)
if err != nil && !os.IsNotExist(err) {
// ignore if the file has already been deleted
return err
}
}
}
err = f.Close()
if err != nil {
return err
}
err = os.Remove(filename)
if err != nil {
return err
}
return nil
}