Merge pull request #3623 from filecoin-project/feat/base-fee-tamping

introduce logic to perform base fee tamping around the upgrade time

build/params_2k.go

@@ -10,6 +10,9 @@ import (
 	"github.com/filecoin-project/specs-actors/actors/builtin/verifreg"
 )
 
+const UpgradeBreezeHeight = 0
+const BreezeGasTampingDuration = 0
+
 func init() {
 	power.ConsensusMinerMinPower = big.NewInt(2048)
 	miner.SupportedProofTypes = map[abi.RegisteredSealProof]struct{}{

build/params_testground.go

@@ -69,4 +69,7 @@ var (
 
 	PackingEfficiencyNum   int64 = 4
 	PackingEfficiencyDenom int64 = 5
+
+	UpgradeBreezeHeight      abi.ChainEpoch = 0
+	BreezeGasTampingDuration abi.ChainEpoch = 0
 )

build/params_testnet.go

@@ -12,6 +12,9 @@ import (
 	"github.com/filecoin-project/specs-actors/actors/builtin/power"
 )
 
+const UpgradeBreezeHeight = 41280
+const BreezeGasTampingDuration = 120
+
 func init() {
 	power.ConsensusMinerMinPower = big.NewInt(10 << 40)
 	miner.SupportedProofTypes = map[abi.RegisteredSealProof]struct{}{

chain/store/basefee.go

@@ -40,6 +40,10 @@ func computeNextBaseFee(baseFee types.BigInt, gasLimitUsed int64, noOfBlocks int
 }
 
 func (cs *ChainStore) ComputeBaseFee(ctx context.Context, ts *types.TipSet) (abi.TokenAmount, error) {
+	if ts.Height() > build.UpgradeBreezeHeight && ts.Height() < build.UpgradeBreezeHeight+build.BreezeGasTampingDuration {
+		return abi.NewTokenAmount(100), nil
+	}
+
 	zero := abi.NewTokenAmount(0)
 
 	// totalLimit is sum of GasLimits of unique messages in a tipset