feemarket: update base fee in BeginBlock (#822)

* Update base fee in begin blocker

Closes: #820

* changelog

Co-authored-by: Federico Kunze Küllmer <31522760+fedekunze@users.noreply.github.com>

CHANGELOG.md

@@ -40,6 +40,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 ### State Machine Breaking
 
 - (evm) [tharsis#840](https://github.com/tharsis/ethermint/pull/840) Store empty topics as empty array rather than nil.
+- (feemarket) [tharsis#822](https://github.com/tharsis/ethermint/pull/822) Update EIP1559 base fee in `BeginBlock`.
 
 ### Improvements
 

app/app.go

@@ -439,6 +439,7 @@ func NewEthermintApp(
 	app.mm.SetOrderBeginBlockers(
 		upgradetypes.ModuleName,
 		capabilitytypes.ModuleName,
+		feemarkettypes.ModuleName,
 		evmtypes.ModuleName,
 		minttypes.ModuleName, distrtypes.ModuleName, slashingtypes.ModuleName,
 		evidencetypes.ModuleName, stakingtypes.ModuleName, ibchost.ModuleName,

rpc/ethereum/backend/backend.go

@@ -955,7 +955,7 @@ func (e *EVMBackend) BaseFee(height int64) (*big.Int, error) {
 		return nil, err
 	}
 
-	baseFee := types.BaseFeeFromEvents(blockRes.EndBlockEvents)
+	baseFee := types.BaseFeeFromEvents(blockRes.BeginBlockEvents)
 	if baseFee != nil {
 		return baseFee, nil
 	}

rpc/ethereum/namespaces/eth/filters/api.go

@@ -258,7 +258,7 @@ func (api *PublicFilterAPI) NewBlockFilter() rpc.ID {
 					continue
 				}
 
-				baseFee := types.BaseFeeFromEvents(data.ResultEndBlock.Events)
+				baseFee := types.BaseFeeFromEvents(data.ResultBeginBlock.Events)
 
 				header := types.EthHeaderFromTendermint(data.Header, ethtypes.Bloom{}, baseFee)
 				api.filtersMu.Lock()
@@ -310,7 +310,7 @@ func (api *PublicFilterAPI) NewHeads(ctx context.Context) (*rpc.Subscription, er
 					continue
 				}
 
-				baseFee := types.BaseFeeFromEvents(data.ResultEndBlock.Events)
+				baseFee := types.BaseFeeFromEvents(data.ResultBeginBlock.Events)
 
 				// TODO: fetch bloom from events
 				header := types.EthHeaderFromTendermint(data.Header, ethtypes.Bloom{}, baseFee)

x/feemarket/keeper/abci.go

@@ -9,10 +9,8 @@ import (
 	sdk "github.com/cosmos/cosmos-sdk/types"
 )
 
-// EndBlock also retrieves the bloom filter value from the transient store and commits it to the
-// KVStore. The EVM end block logic doesn't update the validator set, thus it returns
-// an empty slice.
-func (k *Keeper) EndBlock(ctx sdk.Context, req abci.RequestEndBlock) {
+// BeginBlock updates base fee
+func (k *Keeper) BeginBlock(ctx sdk.Context, req abci.RequestBeginBlock) {
 	baseFee := k.CalculateBaseFee(ctx)
 
 	// return immediately if base fee is nil
@@ -29,7 +27,12 @@ func (k *Keeper) EndBlock(ctx sdk.Context, req abci.RequestEndBlock) {
 			sdk.NewAttribute(types.AttributeKeyBaseFee, baseFee.String()),
 		),
 	})
+}
 
+// EndBlock update block gas used.
+// The EVM end block logic doesn't update the validator set, thus it returns
+// an empty slice.
+func (k *Keeper) EndBlock(ctx sdk.Context, req abci.RequestEndBlock) {
 	if ctx.BlockGasMeter() == nil {
 		k.Logger(ctx).Error("block gas meter is nil when setting block gas used")
 		return

x/feemarket/keeper/eip1559.go

@@ -10,7 +10,7 @@ import (
 )
 
 // CalculateBaseFee calculates the base fee for the current block. This is only calculated once per
-// block during EndBlock. If the NoBaseFee parameter is enabled or below activation height, this function returns nil.
+// block during BeginBlock. If the NoBaseFee parameter is enabled or below activation height, this function returns nil.
 // NOTE: This code is inspired from the go-ethereum EIP1559 implementation and adapted to Cosmos SDK-based
 // chains. For the canonical code refer to: https://github.com/ethereum/go-ethereum/blob/master/consensus/misc/eip1559.go
 func (k Keeper) CalculateBaseFee(ctx sdk.Context) *big.Int {

x/feemarket/module.go

@@ -135,7 +135,9 @@ func (am AppModule) LegacyQuerierHandler(legacyQuerierCdc *codec.LegacyAmino) sd
 }
 
 // BeginBlock returns the begin block for the fee market module.
-func (am AppModule) BeginBlock(ctx sdk.Context, req abci.RequestBeginBlock) {}
+func (am AppModule) BeginBlock(ctx sdk.Context, req abci.RequestBeginBlock) {
+	am.keeper.BeginBlock(ctx, req)
+}
 
 // EndBlock returns the end blocker for the fee market module. It returns no validator
 // updates.