implement mock MaxPriorityFeePerGas

go/host/rpc/clientapi/client_api_eth.go

@@ -187,6 +187,18 @@ func (api *EthereumAPI) GetStorageAt(ctx context.Context, encryptedParams common
 	return *enclaveResponse, nil
 }
 
+func (api *EthereumAPI) MaxPriorityFeePerGas(_ context.Context) (*hexutil.Big, error) {
+	// todo - implement with the gas mechanics
+	header, err := api.host.Storage().FetchHeadBatchHeader()
+	if err != nil {
+		api.logger.Error("Unable to retrieve header for fee history.", log.ErrKey, err)
+		return nil, fmt.Errorf("unable to retrieve MaxPriorityFeePerGas")
+	}
+
+	// just return the base fee?
+	return (*hexutil.Big)(header.BaseFee), err
+}
+
 // FeeHistory is a placeholder for an RPC method required by MetaMask/Remix.
 // rpc.DecimalOrHex -> []byte
 func (api *EthereumAPI) FeeHistory(context.Context, string, rpc.BlockNumber, []float64) (*FeeHistoryResult, error) {

integration/obscurogateway/tengateway_test.go

@@ -509,6 +509,7 @@ func testErrorHandling(t *testing.T, httpURL, wsURL string, w wallet.Wallet) {
 		`{"jsonrpc":"2.0","method":"eth_getBalance","params":["0xA58C60cc047592DE97BF1E8d2f225Fc5D959De77", "latest"],"id":1,"extra":"extra_field"}`,
 		`{"jsonrpc":"2.0","method":"eth_sendTransaction","params":[["0xA58C60cc047592DE97BF1E8d2f225Fc5D959De77", "0x1234"]],"id":1}`,
 		`{"jsonrpc":"2.0","method":"eth_getTransactionByHash","params":["0x0000000000000000000000000000000000000000000000000000000000000000"],"id":1}`,
+		`{"jsonrpc":"2.0","method":"eth_maxPriorityFeePerGas","params":[],"id":1}`,
 	} {
 		// ensure the geth request is issued correctly (should return 200 ok with jsonRPCError)
 		_, response, err := httputil.PostDataJSON(ogClient.HTTP(), []byte(req))