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rewards.go
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rewards.go
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package vm
import (
"fmt"
"math/big"
"github.com/spacemeshos/economics/rewards"
"github.com/spacemeshos/go-spacemesh/common/types"
"github.com/spacemeshos/go-spacemesh/genvm/core"
"github.com/spacemeshos/go-spacemesh/log"
)
func (v *VM) addRewards(
lctx ApplyContext,
ss *core.StagedCache,
fees uint64,
blockRewards []types.CoinbaseReward,
) ([]types.Reward, error) {
var (
layersAfterEffectiveGenesis = lctx.Layer.Difference(types.FirstEffectiveGenesis())
subsidy = rewards.TotalSubsidyAtLayer(layersAfterEffectiveGenesis)
total = subsidy + fees
transferred uint64
totalWeight = new(big.Rat)
)
for _, blockReward := range blockRewards {
totalWeight.Add(totalWeight, blockReward.Weight.ToBigRat())
}
result := make([]types.Reward, 0, len(blockRewards))
for _, blockReward := range blockRewards {
relative := blockReward.Weight.ToBigRat()
relative.Quo(relative, totalWeight)
totalReward := new(big.Int).SetUint64(total)
totalReward.
Mul(totalReward, relative.Num()).
Quo(totalReward, relative.Denom())
if !totalReward.IsUint64() {
return nil, fmt.Errorf("%w: total reward %v for %v overflows uint64",
core.ErrInternal, totalReward, blockReward.Coinbase)
}
subsidyReward := new(big.Int).SetUint64(subsidy)
subsidyReward.
Mul(subsidyReward, relative.Num()).
Quo(subsidyReward, relative.Denom())
if !subsidyReward.IsUint64() {
return nil, fmt.Errorf("%w: subsidy reward %v for %v overflows uint64",
core.ErrInternal, subsidyReward, blockReward.Coinbase)
}
v.logger.With().Debug("rewards for coinbase",
lctx.Layer,
blockReward.Coinbase,
log.Stringer("relative weight", &blockReward.Weight),
log.Uint64("subsidy", subsidyReward.Uint64()),
log.Uint64("total", totalReward.Uint64()),
)
reward := types.Reward{
Layer: lctx.Layer,
Coinbase: blockReward.Coinbase,
TotalReward: totalReward.Uint64(),
LayerReward: subsidyReward.Uint64(),
}
result = append(result, reward)
account, err := ss.Get(blockReward.Coinbase)
if err != nil {
return nil, fmt.Errorf("%w: %w", core.ErrInternal, err)
}
account.Balance += reward.TotalReward
if err := ss.Update(account); err != nil {
return nil, fmt.Errorf("%w: %w", core.ErrInternal, err)
}
transferred += totalReward.Uint64()
}
v.logger.With().Debug("rewards for layer",
lctx.Layer,
log.Uint32("after genesis", layersAfterEffectiveGenesis),
log.Uint64("subsidy estimated", subsidy),
log.Uint64("fee", fees),
log.Uint64("total estimated", total),
log.Uint64("total transffered", transferred),
log.Uint64("total burnt", total-transferred),
)
feesCount.Add(float64(fees))
subsidyCount.Add(float64(subsidy))
rewardsCount.Add(float64(transferred))
burntCount.Add(float64(total - transferred))
return result, nil
}