forked from TrueCloudLab/frostfs-node
59 lines
1.2 KiB
Go
59 lines
1.2 KiB
Go
package audit
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import (
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"sort"
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"strings"
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"github.com/nspcc-dev/neofs-api-go/pkg/container"
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"github.com/pkg/errors"
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)
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var ErrInvalidIRNode = errors.New("node is not in the inner ring list")
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func (ap *Processor) selectContainersToAudit(epoch uint64) ([]*container.ID, error) {
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containers, err := ap.containerClient.List(nil)
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if err != nil {
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return nil, errors.Wrap(err, "can't get list of containers to start audit")
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}
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// consider getting extra information about container complexity from
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// audit contract there
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sort.Slice(containers, func(i, j int) bool {
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return strings.Compare(containers[i].String(), containers[j].String()) < 0
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})
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ind := ap.irList.Index()
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irSize := ap.irList.InnerRingSize()
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if ind < 0 || ind >= irSize {
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return nil, ErrInvalidIRNode
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}
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return Select(containers, epoch, uint64(ind), uint64(irSize)), nil
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}
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func Select(ids []*container.ID, epoch, index, size uint64) []*container.ID {
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if index >= size {
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return nil
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}
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var a, b uint64
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ln := uint64(len(ids))
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pivot := ln % size
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delta := ln / size
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index = (index + epoch) % size
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if index < pivot {
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a = delta + 1
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} else {
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a = delta
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b = pivot
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}
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from := a*index + b
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to := a*(index+1) + b
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return ids[from:to]
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}
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