// Scan implements part of the graphstore.Service interface.
func (s *Store) Scan(ctx context.Context, req *spb.ScanRequest, f graphstore.EntryFunc) error {
iter, err := s.db.ScanPrefix(entryKeyPrefixBytes, &Options{LargeRead: true})
if err != nil {
return fmt.Errorf("db seek error: %v", err)
}
defer iter.Close()
for {
key, val, err := iter.Next()
if err == io.EOF {
break
} else if err != nil {
return fmt.Errorf("db iteration error: %v", err)
}
entry, err := Entry(key, val)
if err != nil {
return fmt.Errorf("invalid key/value entry: %v", err)
}
if !graphstore.EntryMatchesScan(req, entry) {
continue
} else if err := f(entry); err == io.EOF {
return nil
} else if err != nil {
return err
}
}
return nil
}
// Scan implements part of the graphstore.Service interface.
func (s *GraphStore) Scan(ctx context.Context, req *spb.ScanRequest, f graphstore.EntryFunc) error {
s.mu.RLock()
defer s.mu.RUnlock()
for _, e := range s.entries {
if !graphstore.EntryMatchesScan(req, e) {
continue
} else if err := f(e); err == io.EOF {
return nil
} else if err != nil {
return err
}
}
return nil
}