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359 lines
11 KiB
359 lines
11 KiB
package chain
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import (
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"math/big"
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"sort"
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"github.com/harmony-one/harmony/shard/committee"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/rlp"
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"github.com/harmony-one/bls/ffi/go/bls"
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"github.com/harmony-one/harmony/block"
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"github.com/harmony-one/harmony/common/denominations"
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"github.com/harmony-one/harmony/consensus/engine"
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"github.com/harmony-one/harmony/consensus/reward"
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"github.com/harmony-one/harmony/consensus/votepower"
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"github.com/harmony-one/harmony/core/state"
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"github.com/harmony-one/harmony/core/types"
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bls2 "github.com/harmony-one/harmony/crypto/bls"
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common2 "github.com/harmony-one/harmony/internal/common"
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"github.com/harmony-one/harmony/internal/ctxerror"
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"github.com/harmony-one/harmony/internal/utils"
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"github.com/harmony-one/harmony/numeric"
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"github.com/harmony-one/harmony/shard"
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"github.com/harmony-one/harmony/staking/slash"
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"github.com/pkg/errors"
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)
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var (
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// BlockReward is the block reward, to be split evenly among block signers.
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BlockReward = new(big.Int).Mul(big.NewInt(24), big.NewInt(denominations.One))
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// BlockRewardStakedCase is the baseline block reward in staked case -
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BlockRewardStakedCase = numeric.NewDecFromBigInt(new(big.Int).Mul(
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big.NewInt(18), big.NewInt(denominations.One),
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))
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totalTokens = numeric.NewDec(12600000000)
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targetStakedPercentage = numeric.MustNewDecFromStr("0.35")
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dynamicAdjust = numeric.MustNewDecFromStr("0.4")
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errPayoutNotEqualBlockReward = errors.New("total payout not equal to blockreward")
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)
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func blockSigners(
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header *block.Header, parentCommittee *shard.Committee,
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) (shard.SlotList, shard.SlotList, error) {
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committerKeys := []*bls.PublicKey{}
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for _, member := range parentCommittee.Slots {
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committerKey := new(bls.PublicKey)
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err := member.BlsPublicKey.ToLibBLSPublicKey(committerKey)
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if err != nil {
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return nil, nil, ctxerror.New(
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"cannot convert BLS public key",
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"blsPublicKey",
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member.BlsPublicKey,
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).WithCause(err)
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}
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committerKeys = append(committerKeys, committerKey)
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}
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mask, err := bls2.NewMask(committerKeys, nil)
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if err != nil {
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return nil, nil, ctxerror.New(
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"cannot create group sig mask",
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).WithCause(err)
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}
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if err := mask.SetMask(header.LastCommitBitmap()); err != nil {
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return nil, nil, ctxerror.New(
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"cannot set group sig mask bits",
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).WithCause(err)
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}
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payable, missing := shard.SlotList{}, shard.SlotList{}
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for idx, member := range parentCommittee.Slots {
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switch signed, err := mask.IndexEnabled(idx); true {
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case err != nil:
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return nil, nil, ctxerror.New("cannot check for committer bit",
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"committerIndex", idx,
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).WithCause(err)
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case signed:
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payable = append(payable, member)
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default:
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missing = append(missing, member)
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}
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}
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return payable, missing, nil
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}
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func ballotResult(
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bc engine.ChainReader, header *block.Header, shardID uint32,
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) (shard.SlotList, shard.SlotList, shard.SlotList, error) {
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// TODO ek – retrieving by parent number (blockNum - 1) doesn't work,
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// while it is okay with hash. Sounds like DB inconsistency.
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// Figure out why.
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parentHeader := bc.GetHeaderByHash(header.ParentHash())
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if parentHeader == nil {
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return nil, nil, nil, ctxerror.New(
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"cannot find parent block header in DB",
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"parentHash", header.ParentHash(),
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)
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}
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parentShardState, err := bc.ReadShardState(parentHeader.Epoch())
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if err != nil {
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return nil, nil, nil, ctxerror.New(
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"cannot read shard state", "epoch", parentHeader.Epoch(),
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).WithCause(err)
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}
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parentCommittee := parentShardState.FindCommitteeByID(shardID)
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if parentCommittee == nil {
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return nil, nil, nil, ctxerror.New(
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"cannot find shard in the shard state",
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"parentBlockNumber", parentHeader.Number(),
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"shardID", parentHeader.ShardID(),
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)
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}
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payable, missing, err := blockSigners(header, parentCommittee)
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return parentCommittee.Slots, payable, missing, err
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}
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func ballotResultBeaconchain(
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bc engine.ChainReader, header *block.Header,
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) (shard.SlotList, shard.SlotList, shard.SlotList, error) {
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return ballotResult(bc, header, shard.BeaconChainShardID)
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}
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func whatPercentStakedNow(
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beaconchain engine.ChainReader,
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) (*numeric.Dec, error) {
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stakedNow := numeric.ZeroDec()
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active, err := beaconchain.ReadActiveValidatorList()
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if err != nil {
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return nil, err
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}
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for i := range active {
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wrapper, err := beaconchain.ReadValidatorData(active[i])
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if err != nil {
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return nil, err
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}
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stakedNow = stakedNow.Add(
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numeric.NewDecFromBigInt(wrapper.TotalDelegation()),
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)
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}
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percentage := stakedNow.Quo(totalTokens)
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return &percentage, nil
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}
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// AccumulateRewards credits the coinbase of the given block with the mining
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// reward. The total reward consists of the static block reward and rewards for
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// included uncles. The coinbase of each uncle block is also rewarded.
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func AccumulateRewards(
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bc engine.ChainReader, state *state.DB, header *block.Header,
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rewarder reward.Distributor, slasher slash.Slasher,
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beaconChain engine.ChainReader,
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) error {
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blockNum := header.Number().Uint64()
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if blockNum == 0 {
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// genesis block has no parent to reward.
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return nil
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}
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if bc.Config().IsStaking(header.Epoch()) &&
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bc.CurrentHeader().ShardID() != shard.BeaconChainShardID {
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return nil
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}
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if bc.Config().IsStaking(header.Epoch()) &&
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bc.CurrentHeader().ShardID() == shard.BeaconChainShardID {
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defaultReward := BlockRewardStakedCase
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if len(header.ShardState()) > 0 {
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// TODO Use cached result in off-chain db instead of full computation
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percentageStaked, err := whatPercentStakedNow(beaconChain)
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if err != nil {
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return err
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}
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howMuchOff := targetStakedPercentage.Sub(*percentageStaked)
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adjustBy := howMuchOff.MulTruncate(numeric.NewDec(100)).Mul(dynamicAdjust)
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defaultReward = defaultReward.Add(adjustBy)
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utils.Logger().Info().
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Str("percentage-token-staked", percentageStaked.String()).
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Str("how-much-off", howMuchOff.String()).
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Str("adjusting-by", adjustBy.String()).
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Str("block-reward", defaultReward.String()).
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Msg("dynamic adjustment of block-reward ")
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// If too much is staked, then possible to have negative reward,
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// not an error, just a possible economic situation, hence we return
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if defaultReward.IsNegative() {
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return nil
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}
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}
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// Take care of my own beacon chain committee, _ is missing, for slashing
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members, payable, _, err := ballotResultBeaconchain(beaconChain, header)
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if err != nil {
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return err
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}
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votingPower := votepower.Compute(members)
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for beaconMember := range payable {
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// TODO Give out whatever leftover to the last voter/handle
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// what to do about share of those that didn't sign
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voter := votingPower.Voters[payable[beaconMember].BlsPublicKey]
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if !voter.IsHarmonyNode {
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due := defaultReward.Mul(
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voter.EffectivePercent.Quo(votepower.StakersShare),
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)
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state.AddBalance(voter.EarningAccount, due.RoundInt())
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}
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}
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// Handle rewards for shardchain
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if cxLinks := header.CrossLinks(); len(cxLinks) != 0 {
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crossLinks := types.CrossLinks{}
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err := rlp.DecodeBytes(cxLinks, &crossLinks)
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if err != nil {
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return err
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}
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type slotPayable struct {
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effective numeric.Dec
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payee common.Address
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bucket int
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index int
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}
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allPayables := []slotPayable{}
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for i := range crossLinks {
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cxLink := crossLinks[i]
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shardState, err := bc.ReadShardState(cxLink.ChainHeader.Epoch())
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if !bc.Config().IsStaking(cxLink.Header().Epoch()) {
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shardState, err = committee.WithStakingEnabled.Compute(cxLink.ChainHeader.Epoch(), bc)
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}
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if err != nil {
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// TEMP HACK: IGNORE THE ERROR as THERE IS NO WAY TO VERIFY THE SIG OF FIRST BLOCK OF SHARD FIRST TIME ENTERING STAKING, NO WAY TO FIND THE LAST COMMITEE AS THERE IS GAP
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// TODO: FIX THIS WITH NEW CROSSLINK FORMAT
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continue
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}
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subComm := shardState.FindCommitteeByID(cxLink.ShardID())
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// _ are the missing signers, later for slashing
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payableSigners, _, err := blockSigners(cxLink.Header(), subComm)
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if err != nil {
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// TEMP HACK: IGNORE THE ERROR as THERE IS NO WAY TO VERIFY THE SIG OF FIRST BLOCK OF SHARD FIRST TIME ENTERING STAKING, NO WAY TO FIND THE LAST COMMITEE AS THERE IS GAP
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// TODO: FIX THIS WITH NEW CROSSLINK FORMAT
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continue
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}
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votingPower := votepower.Compute(payableSigners)
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for j := range payableSigners {
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voter := votingPower.Voters[payableSigners[j].BlsPublicKey]
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if !voter.IsHarmonyNode && !voter.EffectivePercent.IsZero() {
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due := defaultReward.Mul(
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voter.EffectivePercent.Quo(votepower.StakersShare),
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)
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to := voter.EarningAccount
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allPayables = append(allPayables, slotPayable{
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effective: due,
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payee: to,
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bucket: i,
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index: j,
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})
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}
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}
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}
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resultsHandle := make([][]slotPayable, len(crossLinks))
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for i := range resultsHandle {
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resultsHandle[i] = []slotPayable{}
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}
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for _, payThem := range allPayables {
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bucket := payThem.bucket
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resultsHandle[bucket] = append(resultsHandle[bucket], payThem)
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}
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// Check if any errors and sort each bucket to enforce order
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for bucket := range resultsHandle {
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sort.SliceStable(resultsHandle[bucket],
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func(i, j int) bool {
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return resultsHandle[bucket][i].index < resultsHandle[bucket][j].index
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},
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)
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}
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// Finally do the pay
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for bucket := range resultsHandle {
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for payThem := range resultsHandle[bucket] {
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state.AddBalance(
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resultsHandle[bucket][payThem].payee,
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resultsHandle[bucket][payThem].effective.TruncateInt(),
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)
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}
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}
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}
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return nil
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}
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payable := []struct {
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string
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common.Address
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*big.Int
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}{}
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parentHeader := bc.GetHeaderByHash(header.ParentHash())
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if parentHeader.Number().Cmp(common.Big0) == 0 {
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// Parent is an epoch block,
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// which is not signed in the usual manner therefore rewards nothing.
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return nil
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}
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_, signers, _, err := ballotResult(bc, header, header.ShardID())
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if err != nil {
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return err
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}
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totalAmount := rewarder.Award(
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BlockReward, signers, func(receipient common.Address, amount *big.Int) {
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payable = append(payable, struct {
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string
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common.Address
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*big.Int
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}{common2.MustAddressToBech32(receipient), receipient, amount},
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)
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},
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)
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if totalAmount.Cmp(BlockReward) != 0 {
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utils.Logger().Error().
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Int64("block-reward", BlockReward.Int64()).
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Int64("total-amount-paid-out", totalAmount.Int64()).
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Msg("Total paid out was not equal to block-reward")
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return errors.Wrapf(
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errPayoutNotEqualBlockReward, "payout "+totalAmount.String(),
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)
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}
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for i := range payable {
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state.AddBalance(payable[i].Address, payable[i].Int)
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}
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header.Logger(utils.Logger()).Debug().
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Int("NumAccounts", len(payable)).
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Str("TotalAmount", totalAmount.String()).
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Msg("[Block Reward] Successfully paid out block reward")
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return nil
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}
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