fix: allow empty to field in eth_call to simulate contract deploy

conf/tests.yml

@@ -21,13 +21,13 @@ database:
   max_open_conns: 0
 
 gateway:
-  chain_id: 42262
+  chain_id: 23293
   http:
     host: "localhost"
-    port: 8545
+    port: 8945
   ws:
     host: "localhost"
-    port: 8546
+    port: 8946
   monitoring:
     host: "localhost"
     port: 9999

docker/common/start.sh

@@ -87,6 +87,11 @@ notice "Waiting for Oasis node to start..."
 while [[ ! -S ${OASIS_NODE_SOCKET} ]]; do echo -n .; sleep 1; done
 echo
 
+chmod 755 /serverdir/node/net-runner/
+chmod 755 /serverdir/node/net-runner/network/
+chmod 755 /serverdir/node/net-runner/network/client-0/
+chmod a+rw /serverdir/node/net-runner/network/client-0/internal.sock
+
 notice "Starting oasis-web3-gateway...\n"
 ${OASIS_WEB3_GATEWAY} --config ${OASIS_WEB3_GATEWAY_CONFIG_FILE} 2>1 &>/var/log/oasis-web3-gateway.log &
 OASIS_WEB3_GATEWAY_PID=$!

rpc/eth/api.go

@@ -367,11 +367,13 @@ func (api *publicAPI) Call(ctx context.Context, args utils.TransactionArgs, bloc
 		sender   = common.Address{1}
 		gasPrice = []byte{1}
 		// This gas cap should be enough for SimulateCall an ethereum transaction
-		gas uint64 = 30_000_000
+		gas     uint64 = 30_000_000
+		toBytes        = []byte{}
 	)
 
-	if args.To == nil {
-		return []byte{}, errors.New("to address not specified")
+	// When simulating a contract deploy the To address may not be specified
+	if args.To != nil {
+		toBytes = args.To.Bytes()
 	}
 	if args.GasPrice != nil {
 		gasPrice = args.GasPrice.ToInt().Bytes()
@@ -396,14 +398,14 @@ func (api *publicAPI) Call(ctx context.Context, args utils.TransactionArgs, bloc
 	}
 
 	res, err := evm.NewV1(api.client).SimulateCall(
-		ctx,
-		round,
-		gasPrice,
-		gas,
-		sender.Bytes(),
-		args.To.Bytes(),
-		amount,
-		input,
+		ctx,            // context
+		round,          // round
+		gasPrice,       // gasPrice
+		gas,            // gasLimit
+		sender.Bytes(), // caller
+		toBytes,        // address
+		amount,         // value
+		input,          // data
 	)
 	if err != nil {
 		return nil, api.handleCallFailure(ctx, logger, err)

tests/rpc/contracts/evm_constructor_require.hex

@@ -0,0 +1 @@
+6080604052348015600e575f80fd5b5060405162461bcd60e51b815260206004820152601360248201527f4578616d706c654572726f725265717569726500000000000000000000000000604482015260640160405180910390fdfe

tests/rpc/contracts/evm_constructor_revert.hex

@@ -0,0 +1 @@
+6080604052348015600e575f80fd5b5060405163547796ff60e01b815260206004820152601260248201527122bc30b6b83632a1bab9ba37b6a2b93937b960711b604482015260640160405180910390fdfe

tests/rpc/tx_test.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	_ "embed"
 	"math/big"
+	"reflect"
 	"strings"
 	"testing"
 	"time"
@@ -71,6 +72,117 @@ func waitTransaction(ctx context.Context, ec *ethclient.Client, txhash common.Ha
 	}
 }
 
+/*
+contract ExampleRequire {
+    constructor () {
+        require(false, "ExampleErrorRequire");
+    }
+}
+*/
+//go:embed contracts/evm_constructor_require.hex
+var evmConstructorRequireHex string
+
+/*
+contract ExampleCustomError {
+    error Example(string x);
+    constructor () {
+        revert Example("ExampleCustomError");
+    }
+}
+*/
+//go:embed contracts/evm_constructor_revert.hex
+var evmConstructorRevertHex string
+
+// extractDataFromUnexportedError extracts the "Data" field from *rpc.jsonError that is not exported
+// using reflection.
+func extractDataFromUnexportedError(err error) string {
+	if err == nil {
+		return ""
+	}
+
+	val := reflect.ValueOf(err)
+	if val.Kind() == reflect.Ptr && !val.IsNil() {
+		// Assuming jsonError is a struct
+		errVal := val.Elem()
+
+		// Check if the struct has a field named "Data".
+		dataField := errVal.FieldByName("Data")
+		if dataField.IsValid() && dataField.CanInterface() {
+			// Assuming the data field is a string
+			return dataField.Interface().(string)
+		}
+	}
+
+	return ""
+}
+
+// Verifies  that require(false,"...") in constructor works as expected
+func testContractConstructorError(t *testing.T, contractCode string, expectedError string) {
+	ec := localClient(t, false)
+
+	t.Logf("compiled contract: %s", contractCode)
+	code := common.FromHex(strings.TrimSpace(contractCode))
+
+	callMsg := ethereum.CallMsg{
+		From: tests.TestKey1.EthAddress,
+		Gas:  0,
+		Data: code,
+	}
+
+	// Estimate contract creation gas requirements
+	gasCost, err := ec.EstimateGas(context.Background(), callMsg)
+	require.Nil(t, err, "estimate gas failed")
+	require.Greater(t, gasCost, uint64(0), "gas estimate must be positive")
+	t.Logf("gas estimate for contract creation: %d", gasCost)
+
+	// Evaluate the contract creation via `eth_call`
+	callMsg.Gas = 250000 // gasCost
+	result, err := ec.CallContract(context.Background(), callMsg, nil)
+	require.NotNil(t, err, "constructor expected to throw error")
+	require.Equal(t, expectedError, extractDataFromUnexportedError(err))
+	require.Nil(t, result)
+}
+
+func TestContractConstructorRequire(t *testing.T) {
+	testContractConstructorError(t, evmConstructorRequireHex, "0x08c379a0000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000000134578616d706c654572726f725265717569726500000000000000000000000000")
+}
+
+func TestContractConstructorRevert(t *testing.T) {
+	testContractConstructorError(t, evmConstructorRevertHex, "0x547796ff000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000000124578616d706c65437573746f6d4572726f720000000000000000000000000000")
+}
+
+// Verify contract creation can be simulated and returns an address
+func TestContractCreateInCall(t *testing.T) {
+	ec := localClient(t, false)
+
+	t.Logf("compiled contract: %s", evmSolTestCompiledHex)
+	code := common.FromHex(strings.TrimSpace(evmSolTestCompiledHex))
+
+	gasPrice, err := ec.SuggestGasPrice(context.Background())
+	require.Nil(t, err, "get gasPrice failed")
+
+	callMsg := ethereum.CallMsg{
+		From:     tests.TestKey1.EthAddress,
+		Gas:      0,
+		GasPrice: gasPrice,
+		Data:     code,
+	}
+
+	// Estimate contract creation gas requirements
+	gasCost, err := ec.EstimateGas(context.Background(), callMsg)
+	require.NoError(t, err, "estimate gas failed")
+	require.Greater(t, gasCost, uint64(0), "gas estimate must be positive")
+	t.Logf("gas estimate for contract creation: %d", gasCost)
+
+	// Evaluate the contract creation via `eth_call`
+	callMsg.Gas = 250000 // gasCost
+	result, err := ec.CallContract(context.Background(), callMsg, nil)
+	require.Nil(t, err, "call contract")
+
+	require.NotNil(t, result)
+	require.Equal(t, len(result), 20)
+}
+
 func testContractCreation(t *testing.T, value *big.Int) uint64 {
 	ec := localClient(t, false)
 

tests/tools/spinup-oasis-stack.sh

@@ -19,8 +19,12 @@ function paratime_ver {
 export FIXTURE_FILE="${OASIS_NODE_DATADIR}/fixture.json"
 export STAKING_GENESIS_FILE="$(dirname "$0")/staking_genesis.json"
 
-rm -rf "$OASIS_NODE_DATADIR"
-mkdir -p "$OASIS_NODE_DATADIR"
+rm -rf "$OASIS_NODE_DATADIR/net-runner" || true
+rm -rf "$OASIS_NODE_DATADIR/net-runner.log" || true
+rm -rf "$OASIS_NODE_DATADIR/fixture.json" || true
+# When $OASIS_NODE_DATADIR is bind-mounted, below fails, but the above succeed
+rm -rf "$OASIS_NODE_DATADIR" || true
+mkdir -p "$OASIS_NODE_DATADIR" || true
 
 # Prepare configuration for oasis-node (fixture).
 ${OASIS_NET_RUNNER} dump-fixture \