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105 lines
3.7 KiB
105 lines
3.7 KiB
package chain
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import (
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"math/big"
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"github.com/ethereum/go-ethereum/common"
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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/core/state"
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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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)
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// BlockReward is the block reward, to be split evenly among block signers.
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var BlockReward = new(big.Int).Mul(big.NewInt(24), big.NewInt(denominations.One))
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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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) error {
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blockNum := header.Number().Uint64()
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if blockNum == 0 {
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// Epoch block has no parent to reward.
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return nil
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}
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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 ctxerror.New("cannot find parent block header in DB",
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"parentHash", header.ParentHash())
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}
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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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parentShardState, err := bc.ReadShardState(parentHeader.Epoch())
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if err != nil {
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return ctxerror.New("cannot read shard state",
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"epoch", parentHeader.Epoch(),
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).WithCause(err)
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}
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parentCommittee := parentShardState.FindCommitteeByID(parentHeader.ShardID())
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if parentCommittee == nil {
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return ctxerror.New("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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var committerKeys []*bls.PublicKey
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for _, member := range parentCommittee.NodeList {
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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 ctxerror.New("cannot convert BLS public key",
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"blsPublicKey", member.BlsPublicKey).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 ctxerror.New("cannot create group sig mask").WithCause(err)
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}
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if err := mask.SetMask(header.LastCommitBitmap()); err != nil {
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return ctxerror.New("cannot set group sig mask bits").WithCause(err)
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}
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totalAmount := big.NewInt(0)
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var accounts []common.Address
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signers := []string{}
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for idx, member := range parentCommittee.NodeList {
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if signed, err := mask.IndexEnabled(idx); err != nil {
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return ctxerror.New("cannot check for committer bit",
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"committerIndex", idx,
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).WithCause(err)
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} else if signed {
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accounts = append(accounts, member.EcdsaAddress)
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}
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}
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numAccounts := big.NewInt(int64(len(accounts)))
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last := new(big.Int)
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for i, account := range accounts {
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cur := new(big.Int)
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cur.Mul(BlockReward, big.NewInt(int64(i+1))).Div(cur, numAccounts)
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diff := new(big.Int).Sub(cur, last)
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signers = append(signers, common2.MustAddressToBech32(account))
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state.AddBalance(account, diff)
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totalAmount = new(big.Int).Add(totalAmount, diff)
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last = cur
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}
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header.Logger(utils.Logger()).Debug().
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Str("NumAccounts", numAccounts.String()).
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Str("TotalAmount", totalAmount.String()).
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Strs("Signers", signers).
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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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