43 lines
1.2 KiB
Go
43 lines
1.2 KiB
Go
package store
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import (
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"context"
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"github.com/filecoin-project/lotus/build"
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"github.com/filecoin-project/lotus/chain/types"
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"github.com/filecoin-project/specs-actors/actors/abi"
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"github.com/filecoin-project/specs-actors/actors/abi/big"
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"golang.org/x/xerrors"
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)
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func (cs *ChainStore) ComputeBaseFee(ctx context.Context, ts *types.TipSet) (abi.TokenAmount, error) {
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zero := abi.NewTokenAmount(0)
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totalLimit := int64(0)
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for _, b := range ts.Blocks() {
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msg1, msg2, err := cs.MessagesForBlock(b)
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if err != nil {
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return zero, xerrors.Errorf("error getting messages for: %s: %w", b.Cid(), err)
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}
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for _, m := range msg1 {
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totalLimit += m.GasLimit
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}
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for _, m := range msg2 {
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totalLimit += m.Message.GasLimit
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}
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}
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parentBaseFee := ts.Blocks()[0].ParentBaseFee
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delta := totalLimit/int64(len(ts.Blocks())) - build.BlockGasTarget
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change := big.Mul(parentBaseFee, big.NewInt(delta))
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change = big.Div(change, big.NewInt(build.BlockGasTarget))
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change = big.Div(change, big.NewInt(build.BaseFeeMaxChangeDenom))
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baseFee := big.Add(parentBaseFee, change)
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if big.Cmp(baseFee, big.NewInt(build.MinimumBaseFee)) < 0 {
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baseFee = big.NewInt(build.MinimumBaseFee)
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}
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return baseFee, nil
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}
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