87 lines
2 KiB
Go
87 lines
2 KiB
Go
package temporalrepo
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import (
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"bytes"
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"encoding/binary"
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"github.com/pkg/errors"
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"github.com/cockroachdb/pebble"
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)
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type Pebble struct {
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db *pebble.DB
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}
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func NewPebble(path string) (*Pebble, error) {
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db, err := pebble.Open(path, &pebble.Options{Cache: pebble.NewCache(16 << 20), MaxOpenFiles: 2000})
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repo := &Pebble{db: db}
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return repo, errors.Wrapf(err, "unable to open %s", path)
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}
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func (repo *Pebble) SetNodesAt(name [][]byte, heights []int32) error {
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// key format: height(4B) + 0(1B) + name(varable length)
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key := bytes.NewBuffer(nil)
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batch := repo.db.NewBatch()
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defer batch.Close()
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for i, name := range name {
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key.Reset()
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binary.Write(key, binary.BigEndian, heights[i])
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binary.Write(key, binary.BigEndian, byte(0))
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key.Write(name)
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err := batch.Set(key.Bytes(), nil, pebble.NoSync)
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if err != nil {
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return errors.Wrap(err, "in set")
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}
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}
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return errors.Wrap(batch.Commit(pebble.NoSync), "in commit")
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}
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func (repo *Pebble) NodesAt(height int32) ([][]byte, error) {
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prefix := bytes.NewBuffer(nil)
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binary.Write(prefix, binary.BigEndian, height)
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binary.Write(prefix, binary.BigEndian, byte(0))
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end := bytes.NewBuffer(nil)
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binary.Write(end, binary.BigEndian, height)
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binary.Write(end, binary.BigEndian, byte(1))
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prefixIterOptions := &pebble.IterOptions{
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LowerBound: prefix.Bytes(),
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UpperBound: end.Bytes(),
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}
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var names [][]byte
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iter := repo.db.NewIter(prefixIterOptions)
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for iter.First(); iter.Valid(); iter.Next() {
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// Skipping the first 5 bytes (height and a null byte), we get the name.
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name := make([]byte, len(iter.Key())-5)
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copy(name, iter.Key()[5:]) // iter.Key() reuses its buffer
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names = append(names, name)
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}
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return names, errors.Wrap(iter.Close(), "in close")
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}
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func (repo *Pebble) Close() error {
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err := repo.db.Flush()
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if err != nil {
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// if we fail to close are we going to try again later?
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return errors.Wrap(err, "on flush")
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}
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err = repo.db.Close()
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return errors.Wrap(err, "on close")
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}
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func (repo *Pebble) Flush() error {
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_, err := repo.db.AsyncFlush()
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return err
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}
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