75 lines
1.5 KiB
Go
75 lines
1.5 KiB
Go
package blobovnicza
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import (
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"encoding/binary"
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"fmt"
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"code.cloudfoundry.org/bytefmt"
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"github.com/pkg/errors"
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"go.etcd.io/bbolt"
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)
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const firstBucketBound = uint64(32 * 1 << 10) // 32KB
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func stringifyBounds(lower, upper uint64) string {
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return fmt.Sprintf("[%s:%s]",
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stringifyByteSize(lower),
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stringifyByteSize(upper),
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)
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}
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func stringifyByteSize(sz uint64) string {
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return bytefmt.ByteSize(sz)
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}
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func bucketKeyFromBounds(upperBound uint64) []byte {
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buf := make([]byte, binary.MaxVarintLen64)
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ln := binary.PutUvarint(buf, upperBound)
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return buf[:ln]
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}
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func bucketForSize(sz uint64) []byte {
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var upperBound uint64
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for upperBound = firstBucketBound; upperBound < sz; upperBound *= 2 {
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}
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return bucketKeyFromBounds(upperBound)
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}
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func (b *Blobovnicza) incSize(sz uint64) {
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b.filled.Add(sz)
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}
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func (b *Blobovnicza) decSize(sz uint64) {
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b.filled.Sub(sz)
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}
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func (b *Blobovnicza) full() bool {
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return b.filled.Load() >= b.fullSizeLimit
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}
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func (b *Blobovnicza) syncFullnessCounter() error {
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return errors.Wrap(b.boltDB.View(func(tx *bbolt.Tx) error {
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sz := uint64(0)
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if err := b.iterateBucketKeys(func(lower, upper uint64, key []byte) (bool, error) {
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buck := tx.Bucket(key)
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if buck == nil {
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return false, errors.Errorf("bucket not found %s", stringifyBounds(lower, upper))
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}
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sz += uint64(buck.Stats().KeyN) * (upper - lower)
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return false, nil
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}); err != nil {
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return err
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}
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b.filled.Store(sz)
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return nil
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}), "(%T) could not sync fullness counter")
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}
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