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46 lines
1.7 KiB
46 lines
1.7 KiB
package chain
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import (
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"context"
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"math/big"
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"time"
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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/numeric"
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"github.com/harmony-one/harmony/shard"
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stakingReward "github.com/harmony-one/harmony/staking/reward"
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)
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// GetCirculatingSupply using the following formula:
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// (TotalInitialTokens * percentReleased) + PreStakingBlockRewards + StakingBlockRewards
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//
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// Note that PreStakingBlockRewards is set to the amount of rewards given out by the
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// LAST BLOCK of the pre-staking era regardless of what the current block height is
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// if network is in the pre-staking era. This is for implementation reasons, reference
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// stakingReward.GetTotalPreStakingTokens for more details.
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//
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// WARNING: only works on beaconchain if in staking era.
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func GetCirculatingSupply(
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ctx context.Context, chain engine.ChainReader,
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) (ret numeric.Dec, err error) {
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currHeader, timestamp := chain.CurrentHeader(), time.Now().Unix()
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stakingBlockRewards := big.NewInt(0)
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if chain.Config().IsStaking(currHeader.Epoch()) {
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if chain.ShardID() != shard.BeaconChainShardID {
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return numeric.Dec{}, stakingReward.ErrInvalidBeaconChain
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}
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if stakingBlockRewards, err = chain.ReadBlockRewardAccumulator(currHeader.Number().Uint64()); err != nil {
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return numeric.Dec{}, err
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}
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}
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releasedInitSupply := stakingReward.TotalInitialTokens.Mul(
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reward.PercentageForTimeStamp(timestamp),
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)
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preStakingBlockRewards := stakingReward.GetTotalPreStakingTokens().Sub(stakingReward.TotalInitialTokens)
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return releasedInitSupply.Add(preStakingBlockRewards).Add(
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numeric.NewDecFromBigIntWithPrec(stakingBlockRewards, 18),
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), nil
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}
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