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Basefee change depends on unique messages not all messages

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Signed-off-by: Jakub Sztandera <kubuxu@protocol.ai>
This commit is contained in:
Jakub Sztandera 2020-08-18 15:19:24 +02:00
parent 1ba5dd4c72
commit c841f26256
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GPG Key ID: 9A9AF56F8B3879BA
3 changed files with 37 additions and 6 deletions
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3
build/params_shared_vals.go
View File

@ -89,11 +89,14 @@ const VerifSigCacheSize = 32000
// TODO: If this is gonna stay, it should move to specs-actors
const BlockMessageLimit = 10000
const BlockGasLimit = 10_000_000_000
const BlockGasTarget = BlockGasLimit / 2
const BaseFeeMaxChangeDenom = 8 // 12.5%
const InitialBaseFee = 100e6
const MinimumBaseFee = 100
const PackingEfficiencyNum = 4
const PackingEfficiencyDenom = 5
// Actor consts
// TODO: Pull from actors when its made not private

34
chain/store/basefee.go
View File

@ -7,11 +7,26 @@ import (
"github.com/filecoin-project/lotus/chain/types"
"github.com/filecoin-project/specs-actors/actors/abi"
"github.com/filecoin-project/specs-actors/actors/abi/big"
"github.com/ipfs/go-cid"
"golang.org/x/xerrors"
)
func computeNextBaseFee(baseFee types.BigInt, gasLimitUsed int64, noOfBlocks int) types.BigInt {
delta := gasLimitUsed/int64(noOfBlocks) - build.BlockGasTarget
// deta := 1/PackingEfficiency * gasLimitUsed/noOfBlocks - build.BlockGasTarget
// change := baseFee * deta / BlockGasTarget / BaseFeeMaxChangeDenom
// nextBaseFee = baseFee + change
// nextBaseFee = max(nextBaseFee, build.MinimumBaseFee)
delta := build.PackingEfficiencyDenom * gasLimitUsed / int64(noOfBlocks*build.PackingEfficiencyNum)
delta -= build.BlockGasTarget
// cap change at 12.5% (BaseFeeMaxChangeDenom) by capping delta
if delta > build.BlockGasTarget {
delta = build.BlockGasTarget
}
if delta < -build.BlockGasTarget {
delta = -build.BlockGasTarget
}
change := big.Mul(baseFee, big.NewInt(delta))
change = big.Div(change, big.NewInt(build.BlockGasTarget))
@ -26,17 +41,30 @@ func computeNextBaseFee(baseFee types.BigInt, gasLimitUsed int64, noOfBlocks int
func (cs *ChainStore) ComputeBaseFee(ctx context.Context, ts *types.TipSet) (abi.TokenAmount, error) {
zero := abi.NewTokenAmount(0)
// totalLimit is sum of GasLimits of unique messages in a tipset
totalLimit := int64(0)
seen := make(map[cid.Cid]struct{})
for _, b := range ts.Blocks() {
msg1, msg2, err := cs.MessagesForBlock(b)
if err != nil {
return zero, xerrors.Errorf("error getting messages for: %s: %w", b.Cid(), err)
}
for _, m := range msg1 {
totalLimit += m.GasLimit
c := m.Cid()
if _, ok := seen[c]; !ok {
totalLimit += m.GasLimit
seen[c] = struct{}{}
}
}
for _, m := range msg2 {
totalLimit += m.Message.GasLimit
c := m.Cid()
if _, ok := seen[c]; !ok {
totalLimit += m.Message.GasLimit
seen[c] = struct{}{}
}
}
}
parentBaseFee := ts.Blocks()[0].ParentBaseFee

6
chain/store/basefee_test.go
View File

@ -18,10 +18,10 @@ func TestBaseFee(t *testing.T) {
}{
{100e6, 0, 1, 87.5e6},
{100e6, 0, 5, 87.5e6},
{100e6, build.BlockGasTarget, 1, 100e6},
{100e6, build.BlockGasTarget * 2, 2, 100e6},
{100e6, build.BlockGasTarget, 1, 103.125e6},
{100e6, build.BlockGasTarget * 2, 2, 103.125e6},
{100e6, build.BlockGasLimit * 2, 2, 112.5e6},
{100e6, build.BlockGasLimit * 1.5, 2, 106.25e6},
{100e6, build.BlockGasLimit * 1.5, 2, 110937500},
}
for _, test := range tests {