64 lines
1.3 KiB
Go
64 lines
1.3 KiB
Go
package mailserver
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import (
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"github.com/ethereum/go-ethereum/common"
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"github.com/syndtr/goleveldb/leveldb"
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"github.com/syndtr/goleveldb/leveldb/iterator"
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"github.com/syndtr/goleveldb/leveldb/util"
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)
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const batchSize = 1000
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// Cleaner removes old messages from a db
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type Cleaner struct {
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db dbImpl
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batchSize int
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}
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// NewCleanerWithDB returns a new Cleaner for db
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func NewCleanerWithDB(db dbImpl) *Cleaner {
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return &Cleaner{
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db: db,
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batchSize: batchSize,
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}
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}
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// Prune removes messages sent between lower and upper timestamps and returns how many has been removed
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func (c *Cleaner) Prune(lower, upper uint32) (int, error) {
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var zero common.Hash
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kl := NewDbKey(lower, zero)
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ku := NewDbKey(upper, zero)
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i := c.db.NewIterator(&util.Range{Start: kl.raw, Limit: ku.raw}, nil)
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defer i.Release()
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return c.prune(i)
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}
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func (c *Cleaner) prune(i iterator.Iterator) (int, error) {
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batch := leveldb.Batch{}
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removed := 0
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for i.Next() {
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batch.Delete(i.Key())
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if batch.Len() == c.batchSize {
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if err := c.db.Write(&batch, nil); err != nil {
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return removed, err
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}
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removed = removed + batch.Len()
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batch.Reset()
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}
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}
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if batch.Len() > 0 {
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if err := c.db.Write(&batch, nil); err != nil {
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return removed, err
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}
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removed = removed + batch.Len()
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}
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return removed, nil
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}
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