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tombstone.go
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tombstone.go
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package tsm1
import (
"io/ioutil"
"os"
"path/filepath"
"strings"
"sync"
)
type Tombstoner struct {
mu sync.Mutex
// Path is the location of the file to record tombstone. This should be the
// full path to a TSM file.
Path string
}
func (t *Tombstoner) Add(keys []string) error {
t.mu.Lock()
defer t.mu.Unlock()
// If this TSMFile has not been written (mainly in tests), don't write a
// tombstone because the keys will not be written when it's actually saved.
if t.Path == "" {
return nil
}
tombstones, err := t.readTombstone()
if err != nil {
return nil
}
for _, k := range keys {
tombstones = append(tombstones, k)
}
return t.writeTombstone(tombstones)
}
func (t *Tombstoner) ReadAll() ([]string, error) {
return t.readTombstone()
}
func (t *Tombstoner) Delete() error {
t.mu.Lock()
defer t.mu.Unlock()
if err := os.RemoveAll(t.tombstonePath()); err != nil {
return err
}
return nil
}
// HasTombstones return true if there are any tombstone entries recorded.
func (t *Tombstoner) HasTombstones() bool {
stat, err := os.Stat(t.tombstonePath())
if err != nil {
return false
}
return stat.Size() > 0
}
func (t *Tombstoner) writeTombstone(tombstones []string) error {
tmp, err := ioutil.TempFile(filepath.Dir(t.Path), "tombstone")
if err != nil {
return err
}
defer tmp.Close()
if _, err := tmp.Write([]byte(strings.Join(tombstones, "\n"))); err != nil {
return err
}
// fsync the file to flush the write
if err := tmp.Sync(); err != nil {
return err
}
if err := os.Rename(tmp.Name(), t.tombstonePath()); err != nil {
return err
}
// fsync the dir to flush the rename
dir, err := os.OpenFile(filepath.Dir(t.tombstonePath()), os.O_RDONLY, os.ModeDir)
if err != nil {
return err
}
defer dir.Close()
return dir.Sync()
}
func (t *Tombstoner) readTombstone() ([]string, error) {
var b []byte
tf, err := os.Open(t.tombstonePath())
defer tf.Close()
if !os.IsNotExist(err) {
b, err = ioutil.ReadAll(tf)
if err != nil {
return nil, err
}
}
lines := strings.TrimSpace(string(b))
if lines == "" {
return nil, nil
}
return strings.Split(string(b), "\n"), nil
}
func (t *Tombstoner) tombstonePath() string {
if strings.HasSuffix(t.Path, "tombstone") {
return t.Path
}
// Filename is 0000001.tsm1
filename := filepath.Base(t.Path)
// Strip off the tsm1
ext := filepath.Ext(filename)
if ext != "" {
filename = strings.TrimSuffix(filename, ext)
}
// Append the "tombstone" suffix to create a 0000001.tombstone file
return filepath.Join(filepath.Dir(t.Path), filename+".tombstone")
}