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5a66807989
* First take at updating everything to v5 * Patch gRPC gateway to use prysm v5 Fix patch * Update go ssz --------- Co-authored-by: Preston Van Loon <pvanloon@offchainlabs.com>
43 lines
1.4 KiB
Go
43 lines
1.4 KiB
Go
package stateutil
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import (
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"bytes"
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"encoding/binary"
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"fmt"
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"github.com/pkg/errors"
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fieldparams "github.com/prysmaticlabs/prysm/v5/config/fieldparams"
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"github.com/prysmaticlabs/prysm/v5/encoding/ssz"
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ethpb "github.com/prysmaticlabs/prysm/v5/proto/prysm/v1alpha1"
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)
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func HistoricalSummariesRoot(summaries []*ethpb.HistoricalSummary) ([32]byte, error) {
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max := uint64(fieldparams.HistoricalRootsLength)
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if uint64(len(summaries)) > max {
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return [32]byte{}, fmt.Errorf("historical summary exceeds max length %d", max)
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}
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roots := make([][32]byte, len(summaries))
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for i := 0; i < len(summaries); i++ {
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r, err := summaries[i].HashTreeRoot()
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if err != nil {
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return [32]byte{}, errors.Wrap(err, "could not merkleize historical summary")
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}
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roots[i] = r
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}
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summariesRoot, err := ssz.BitwiseMerkleize(roots, uint64(len(roots)), fieldparams.HistoricalRootsLength)
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if err != nil {
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return [32]byte{}, errors.Wrap(err, "could not compute historical summaries merkleization")
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}
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summariesLenBuf := new(bytes.Buffer)
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if err := binary.Write(summariesLenBuf, binary.LittleEndian, uint64(len(summaries))); err != nil {
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return [32]byte{}, errors.Wrap(err, "could not marshal historical summary length")
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}
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// We need to mix in the length of the slice.
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summariesLenRoot := make([]byte, 32)
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copy(summariesLenRoot, summariesLenBuf.Bytes())
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res := ssz.MixInLength(summariesRoot, summariesLenRoot)
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return res, nil
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}
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