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markset_map.go
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/
markset_map.go
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package splitstore
import (
"bufio"
"io"
"os"
"path/filepath"
"sync"
"github.com/ipfs/go-cid"
"golang.org/x/xerrors"
)
type MapMarkSetEnv struct {
path string
}
var _ MarkSetEnv = (*MapMarkSetEnv)(nil)
type MapMarkSet struct {
mx sync.RWMutex
set map[string]struct{}
persist bool
file *os.File
buf *bufio.Writer
path string
}
var _ MarkSet = (*MapMarkSet)(nil)
func NewMapMarkSetEnv(path string) (*MapMarkSetEnv, error) {
msPath := filepath.Join(path, "markset.map")
err := os.MkdirAll(msPath, 0755) //nolint:gosec
if err != nil {
return nil, xerrors.Errorf("error creating markset directory: %w", err)
}
return &MapMarkSetEnv{path: msPath}, nil
}
func (e *MapMarkSetEnv) New(name string, sizeHint int64) (MarkSet, error) {
path := filepath.Join(e.path, name)
return &MapMarkSet{
set: make(map[string]struct{}, sizeHint),
path: path,
}, nil
}
func (e *MapMarkSetEnv) Recover(name string) (MarkSet, error) {
path := filepath.Join(e.path, name)
s := &MapMarkSet{
set: make(map[string]struct{}),
path: path,
}
in, err := os.Open(path)
if err != nil {
return nil, xerrors.Errorf("error opening markset file for read: %w", err)
}
defer in.Close() //nolint:errcheck
// wrap a buffered reader to make this faster
buf := bufio.NewReader(in)
for {
var sz byte
if sz, err = buf.ReadByte(); err != nil {
break
}
key := make([]byte, int(sz))
if _, err = io.ReadFull(buf, key); err != nil {
break
}
s.set[string(key)] = struct{}{}
}
if err != io.EOF {
return nil, xerrors.Errorf("error reading markset file: %w", err)
}
file, err := os.OpenFile(s.path, os.O_WRONLY|os.O_APPEND, 0)
if err != nil {
return nil, xerrors.Errorf("error opening markset file for write: %w", err)
}
s.persist = true
s.file = file
s.buf = bufio.NewWriter(file)
return s, nil
}
func (e *MapMarkSetEnv) Close() error {
return nil
}
func (s *MapMarkSet) BeginCriticalSection() error {
s.mx.Lock()
defer s.mx.Unlock()
if s.set == nil {
return errMarkSetClosed
}
if s.persist {
return nil
}
file, err := os.OpenFile(s.path, os.O_CREATE|os.O_TRUNC|os.O_WRONLY, 0644)
if err != nil {
return xerrors.Errorf("error opening markset file: %w", err)
}
// wrap a buffered writer to make this faster
s.buf = bufio.NewWriter(file)
for key := range s.set {
if err := s.writeKey([]byte(key), false); err != nil {
_ = file.Close()
s.buf = nil
return err
}
}
if err := s.buf.Flush(); err != nil {
_ = file.Close()
s.buf = nil
return xerrors.Errorf("error flushing markset file buffer: %w", err)
}
s.file = file
s.persist = true
return nil
}
func (s *MapMarkSet) EndCriticalSection() {
s.mx.Lock()
defer s.mx.Unlock()
if !s.persist {
return
}
_ = s.file.Close()
_ = os.Remove(s.path)
s.file = nil
s.buf = nil
s.persist = false
}
func (s *MapMarkSet) Mark(c cid.Cid) error {
s.mx.Lock()
defer s.mx.Unlock()
if s.set == nil {
return errMarkSetClosed
}
hash := c.Hash()
s.set[string(hash)] = struct{}{}
if s.persist {
if err := s.writeKey(hash, true); err != nil {
return err
}
if err := s.file.Sync(); err != nil {
return xerrors.Errorf("error syncing markset: %w", err)
}
}
return nil
}
func (s *MapMarkSet) MarkMany(batch []cid.Cid) error {
s.mx.Lock()
defer s.mx.Unlock()
if s.set == nil {
return errMarkSetClosed
}
for _, c := range batch {
hash := c.Hash()
s.set[string(hash)] = struct{}{}
if s.persist {
if err := s.writeKey(hash, false); err != nil {
return err
}
}
}
if s.persist {
if err := s.buf.Flush(); err != nil {
return xerrors.Errorf("error flushing markset buffer to disk: %w", err)
}
if err := s.file.Sync(); err != nil {
return xerrors.Errorf("error syncing markset: %w", err)
}
}
return nil
}
func (s *MapMarkSet) Has(cid cid.Cid) (bool, error) {
s.mx.RLock()
defer s.mx.RUnlock()
if s.set == nil {
return false, errMarkSetClosed
}
_, ok := s.set[string(cid.Hash())]
return ok, nil
}
func (s *MapMarkSet) Visit(c cid.Cid) (bool, error) {
s.mx.Lock()
defer s.mx.Unlock()
if s.set == nil {
return false, errMarkSetClosed
}
hash := c.Hash()
key := string(hash)
if _, ok := s.set[key]; ok {
return false, nil
}
s.set[key] = struct{}{}
if s.persist {
if err := s.writeKey(hash, true); err != nil {
return false, err
}
if err := s.file.Sync(); err != nil {
return false, xerrors.Errorf("error syncing markset: %w", err)
}
}
return true, nil
}
func (s *MapMarkSet) Close() error {
s.mx.Lock()
defer s.mx.Unlock()
if s.set == nil {
return nil
}
s.set = nil
if s.file != nil {
if err := s.file.Close(); err != nil {
log.Warnf("error closing markset file: %s", err)
}
if !s.persist {
if err := os.Remove(s.path); err != nil {
log.Warnf("error removing markset file: %s", err)
}
}
}
return nil
}
func (s *MapMarkSet) writeKey(k []byte, flush bool) error {
if err := s.buf.WriteByte(byte(len(k))); err != nil {
return xerrors.Errorf("error writing markset key length to disk: %w", err)
}
if _, err := s.buf.Write(k); err != nil {
return xerrors.Errorf("error writing markset key to disk: %w", err)
}
if flush {
if err := s.buf.Flush(); err != nil {
return xerrors.Errorf("error flushing markset buffer to disk: %w", err)
}
}
return nil
}