Add new custom calldata DA oracle

.changeset/metal-forks-arrive.md

@@ -0,0 +1,5 @@
+---
+"chainlink": patch
+---
+
+Adds new custom calldata DA oracle #wip

core/chains/evm/config/toml/daoracle/config.go

@@ -5,9 +5,10 @@ import "github.com/smartcontractkit/chainlink/v2/core/chains/evm/types"
 type OracleType string
 
 const (
-	OPStack  = OracleType("opstack")
-	Arbitrum = OracleType("arbitrum")
-	ZKSync   = OracleType("zksync")
+	OPStack        = OracleType("opstack")
+	Arbitrum       = OracleType("arbitrum")
+	ZKSync         = OracleType("zksync")
+	CustomCalldata = OracleType("custom_calldata")
 )
 
 type DAOracle struct {

core/chains/evm/gas/rollups/custom_calldata_l1_oracle.go

@@ -0,0 +1,159 @@
+package rollups
+
+import (
+	"context"
+	"encoding/hex"
+	"fmt"
+	"math/big"
+	"strings"
+	"sync"
+	"time"
+
+	"github.com/ethereum/go-ethereum"
+	"github.com/smartcontractkit/chainlink-common/pkg/logger"
+	"github.com/smartcontractkit/chainlink-common/pkg/services"
+
+	"github.com/smartcontractkit/chainlink/v2/core/chains/evm/assets"
+	evmclient "github.com/smartcontractkit/chainlink/v2/core/chains/evm/client"
+	evmconfig "github.com/smartcontractkit/chainlink/v2/core/chains/evm/config"
+)
+
+type customCalldataDAOracle struct {
+	services.StateMachine
+	client     l1OracleClient
+	pollPeriod time.Duration
+	logger     logger.SugaredLogger
+
+	daOracleConfig evmconfig.DAOracle
+	daGasPriceMu   sync.RWMutex
+	daGasPrice     priceEntry
+
+	chInitialized chan struct{}
+	chStop        services.StopChan
+	chDone        chan struct{}
+}
+
+// NewCustomCalldataDAOracle creates a new custom calldata DA oracle. The CustomCalldataDAOracle fetches gas price from
+// whatever function is specified in the DAOracle's CustomGasPriceCalldata field. This allows for more flexibility when
+// chains have custom DA gas calculation methods.
+func NewCustomCalldataDAOracle(lggr logger.Logger, ethClient l1OracleClient, daOracleConfig evmconfig.DAOracle) *customCalldataDAOracle {
+	return &customCalldataDAOracle{
+		client:     ethClient,
+		pollPeriod: PollPeriod,
+		logger:     logger.Sugared(logger.Named(lggr, fmt.Sprintf("CustomCalldataDAOracle(%s)", daOracleConfig.OracleType()))),
+
+		daOracleConfig: daOracleConfig,
+
+		chInitialized: make(chan struct{}),
+		chStop:        make(chan struct{}),
+		chDone:        make(chan struct{}),
+	}
+}
+
+func (o *customCalldataDAOracle) Name() string {
+	return o.logger.Name()
+}
+
+func (o *customCalldataDAOracle) Start(_ context.Context) error {
+	return o.StartOnce(o.Name(), func() error {
+		go o.run()
+		<-o.chInitialized
+		return nil
+	})
+}
+
+func (o *customCalldataDAOracle) Close() error {
+	return o.StopOnce(o.Name(), func() error {
+		close(o.chStop)
+		<-o.chDone
+		return nil
+	})
+}
+
+func (o *customCalldataDAOracle) HealthReport() map[string]error {
+	return map[string]error{o.Name(): o.Healthy()}
+}
+
+func (o *customCalldataDAOracle) run() {
+	defer close(o.chDone)
+
+	o.refresh()
+	close(o.chInitialized)
+
+	t := services.TickerConfig{
+		Initial:   o.pollPeriod,
+		JitterPct: services.DefaultJitter,
+	}.NewTicker(o.pollPeriod)
+	defer t.Stop()
+
+	for {
+		select {
+		case <-o.chStop:
+			return
+		case <-t.C:
+			o.refresh()
+		}
+	}
+}
+
+func (o *customCalldataDAOracle) refresh() {
+	err := o.refreshWithError()
+	if err != nil {
+		o.logger.Criticalw("Failed to refresh gas price", "err", err)
+		o.SvcErrBuffer.Append(err)
+	}
+}
+
+func (o *customCalldataDAOracle) refreshWithError() error {
+	ctx, cancel := o.chStop.CtxCancel(evmclient.ContextWithDefaultTimeout())
+	defer cancel()
+
+	price, err := o.getCustomCalldataGasPrice(ctx)
+	if err != nil {
+		return err
+	}
+
+	o.daGasPriceMu.Lock()
+	defer o.daGasPriceMu.Unlock()
+	o.daGasPrice = priceEntry{price: assets.NewWei(price), timestamp: time.Now()}
+	return nil
+}
+
+func (o *customCalldataDAOracle) GasPrice(_ context.Context) (daGasPrice *assets.Wei, err error) {
+	var timestamp time.Time
+	ok := o.IfStarted(func() {
+		o.daGasPriceMu.RLock()
+		daGasPrice = o.daGasPrice.price
+		timestamp = o.daGasPrice.timestamp
+		o.daGasPriceMu.RUnlock()
+	})
+	if !ok {
+		return daGasPrice, fmt.Errorf("DAGasOracle is not started; cannot estimate gas")
+	}
+	if daGasPrice == nil {
+		return daGasPrice, fmt.Errorf("failed to get DA gas price; gas price not set")
+	}
+	// Validate the price has been updated within the pollPeriod * 2
+	// Allowing double the poll period before declaring the price stale to give ample time for the refresh to process
+	if time.Since(timestamp) > o.pollPeriod*2 {
+		return daGasPrice, fmt.Errorf("gas price is stale")
+	}
+	return
+}
+
+func (o *customCalldataDAOracle) getCustomCalldataGasPrice(ctx context.Context) (*big.Int, error) {
+	daOracleAddress := o.daOracleConfig.OracleAddress().Address()
+	calldata := strings.TrimPrefix(o.daOracleConfig.CustomGasPriceCalldata(), "0x")
+	calldataBytes, err := hex.DecodeString(calldata)
+	if err != nil {
+		return nil, fmt.Errorf("failed to decode custom fee method calldata: %w", err)
+	}
+	b, err := o.client.CallContract(ctx, ethereum.CallMsg{
+		To:   &daOracleAddress,
+		Data: calldataBytes,
+	}, nil)
+	if err != nil {
+		return nil, fmt.Errorf("custom fee method call failed: %w", err)
+	}
+	return new(big.Int).SetBytes(b), nil
+}

core/chains/evm/gas/rollups/custom_calldata_l1_oracle_test.go

@@ -0,0 +1,55 @@
+package rollups
+
+import (
+	"math/big"
+	"testing"
+
+	"github.com/ethereum/go-ethereum"
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/common/hexutil"
+	"github.com/smartcontractkit/chainlink-common/pkg/utils/tests"
+
+	"github.com/smartcontractkit/chainlink/v2/core/chains/evm/config/toml/daoracle"
+	"github.com/smartcontractkit/chainlink/v2/core/chains/evm/gas/rollups/mocks"
+
+	"github.com/stretchr/testify/mock"
+	"github.com/stretchr/testify/require"
+
+	"github.com/smartcontractkit/chainlink-common/pkg/logger"
+)
+
+func TestOPL1Oracle_CalculateCustomCalldataGasPrice(t *testing.T) {
+	oracleAddress := common.HexToAddress("0x0000000000000000000000000000000044433322").String()
+
+	t.Parallel()
+
+	t.Run("correctly fetches gas price if chain has custom calldata", func(t *testing.T) {
+		ethClient := mocks.NewL1OracleClient(t)
+		expectedPriceHex := "0x0000000000000000000000000000000000000000000000000000000000000032"
+
+		daOracle := CreateTestDAOracle(t, daoracle.OPStack, oracleAddress, "0x0000000000000000000000000000000000001234")
+		oracle := NewCustomCalldataDAOracle(logger.Test(t), ethClient, daOracle)
+
+		ethClient.On("CallContract", mock.Anything, mock.IsType(ethereum.CallMsg{}), mock.IsType(&big.Int{})).Run(func(args mock.Arguments) {
+			callMsg := args.Get(1).(ethereum.CallMsg)
+			blockNumber := args.Get(2).(*big.Int)
+			require.NotNil(t, callMsg.To)
+			require.Equal(t, oracleAddress, callMsg.To.String())
+			require.Nil(t, blockNumber)
+		}).Return(hexutil.MustDecode(expectedPriceHex), nil).Once()
+
+		price, err := oracle.getCustomCalldataGasPrice(tests.Context(t))
+		require.NoError(t, err)
+		require.Equal(t, big.NewInt(50), price)
+	})
+
+	t.Run("throws error if custom calldata fails to decode", func(t *testing.T) {
+		ethClient := mocks.NewL1OracleClient(t)
+
+		daOracle := CreateTestDAOracle(t, daoracle.OPStack, oracleAddress, "0xblahblahblah")
+		oracle := NewCustomCalldataDAOracle(logger.Test(t), ethClient, daOracle)
+
+		_, err := oracle.getCustomCalldataGasPrice(tests.Context(t))
+		require.Error(t, err)
+	})
+}

core/config/docs/chains-evm.toml

@@ -264,7 +264,7 @@ TipCapDefault = '1 wei' # Default
 TipCapMin = '1 wei' # Default
 
 [EVM.GasEstimator.DAOracle]
-# OracleType refers to the oracle family this config belongs to. Currently the available oracle types are: 'opstack', 'arbitrum', and 'zksync'.
+# OracleType refers to the oracle family this config belongs to. Currently the available oracle types are: 'opstack', 'arbitrum', 'zksync', and 'custom_calldata'.
 OracleType = 'opstack' # Example
 # OracleAddress is the address of the oracle contract.
 OracleAddress = '0x420000000000000000000000000000000000000F' # Example

docs/CONFIG.md

@@ -9321,7 +9321,7 @@ CustomGasPriceCalldata = '' # Default
 ```toml
 OracleType = 'opstack' # Example
 ```
-OracleType refers to the oracle family this config belongs to. Currently the available oracle types are: 'opstack', 'arbitrum', and 'zksync'.
+OracleType refers to the oracle family this config belongs to. Currently the available oracle types are: 'opstack', 'arbitrum', 'zksync', and 'custom_calldata'.
 
 ### OracleAddress
 ```toml