Implement EIP-1559 support (#215)

Implement EIP1559 support

Co-authored-by: Luu Duc Dong <luuducdong@Ludo-Macbook-Pro.local>
Co-authored-by: Simon Binder <oss@simonbinder.eu>

.github/workflows/ci.yml

@@ -25,15 +25,6 @@ jobs:
          PUB_CACHE: ".dart_tool/pub_cache"
        run: dart pub upgrade
 
-  ensure_formatted:
-    name: "Formatting"
-    runs-on: ubuntu-latest
-    container:
-      image: google/dart
-    steps:
-      - uses: actions/checkout@v2
-      - run: "dart format --output=none --set-exit-if-changed ."
-
   analyze:
     name: "Analysis"
     needs: get_dependencies
@@ -45,6 +36,7 @@ jobs:
           path: .dart_tool
           key: dart-dependencies-${{ hashFiles('pubspec.yaml') }}
       - uses: dart-lang/setup-dart@v1
+      - run: "dart format --output=none --set-exit-if-changed ."
       - run: dart analyze --fatal-infos
 
   vm_tests:

CHANGELOG.md

@@ -1,3 +1,7 @@
+## 2.3.2
+
+- Support EIP-1559 transactions.
+
 ## 2.3.1
 
 - Fix the `Web3Client.custom` constructor not setting all required fields.

lib/src/browser/credentials.dart

@@ -22,7 +22,8 @@ class MetaMaskCredentials extends CredentialsWithKnownAddress
       : address = EthereumAddress.fromHex(hexAddress);
 
   @override
-  Future<MsgSignature> signToSignature(Uint8List payload, {int? chainId}) {
+  Future<MsgSignature> signToSignature(Uint8List payload,
+      {int? chainId, bool isEIP1559 = false}) {
     throw UnsupportedError('Signing raw payloads is not supported on MetaMask');
   }
 

lib/src/core/block_information.dart

@@ -0,0 +1,18 @@
+import 'package:web3dart/src/crypto/formatting.dart';
+import 'package:web3dart/web3dart.dart';
+
+class BlockInformation {
+  EtherAmount? baseFeePerGas;
+
+  BlockInformation({this.baseFeePerGas});
+
+  factory BlockInformation.fromJson(Map<String, dynamic> json) {
+    return BlockInformation(
+        baseFeePerGas: json.containsKey('baseFeePerGas')
+            ? EtherAmount.fromUnitAndValue(
+                EtherUnit.wei, hexToInt(json['baseFeePerGas'] as String))
+            : null);
+  }
+
+  bool get isSupportEIP1559 => baseFeePerGas != null;
+}

lib/src/core/client.dart

@@ -112,6 +112,10 @@ class Web3Client {
     return _makeRPCCall<String>('net_version').then(int.parse);
   }
 
+  Future<BigInt> getChainId() {
+    return _makeRPCCall<String>('eth_chainId').then(BigInt.parse);
+  }
+
   /// Returns true if the node is actively listening for network connections.
   Future<bool> isListeningForNetwork() {
     return _makeRPCCall('net_listening');
@@ -179,6 +183,13 @@ class Web3Client {
         .then((s) => hexToInt(s).toInt());
   }
 
+  Future<BlockInformation> getBlockInformation(
+      {String blockNumber = 'latest', bool isContainFullObj = true}) {
+    return _makeRPCCall<Map<String, dynamic>>(
+            'eth_getBlockByNumber', [blockNumber, isContainFullObj])
+        .then((json) => BlockInformation.fromJson(json));
+  }
+
   /// Gets the balance of the account with the specified address.
   ///
   /// This function allows specifying a custom block mined in the past to get
@@ -271,9 +282,13 @@ class Web3Client {
       return cred.sendTransaction(transaction);
     }
 
-    final signed = await signTransaction(cred, transaction,
+    var signed = await signTransaction(cred, transaction,
         chainId: chainId, fetchChainIdFromNetworkId: fetchChainIdFromNetworkId);
 
+    if (transaction.isEIP1559) {
+      signed = prependTransactionType(0x02, signed);
+    }
+
     return sendRawTransaction(signed);
   }
 
@@ -348,6 +363,8 @@ class Web3Client {
     EtherAmount? value,
     BigInt? amountOfGas,
     EtherAmount? gasPrice,
+    EtherAmount? maxPriorityFeePerGas,
+    EtherAmount? maxFeePerGas,
     Uint8List? data,
     @Deprecated('Parameter is ignored') BlockNum? atBlock,
   }) async {
@@ -360,6 +377,11 @@ class Web3Client {
           if (amountOfGas != null) 'gas': '0x${amountOfGas.toRadixString(16)}',
           if (gasPrice != null)
             'gasPrice': '0x${gasPrice.getInWei.toRadixString(16)}',
+          if (maxPriorityFeePerGas != null)
+            'maxPriorityFeePerGas':
+                '0x${maxPriorityFeePerGas.getInWei.toRadixString(16)}',
+          if (maxFeePerGas != null)
+            'maxFeePerGas': '0x${maxFeePerGas.getInWei.toRadixString(16)}',
           if (value != null) 'value': '0x${value.getInWei.toRadixString(16)}',
           if (data != null) 'data': bytesToHex(data, include0x: true),
         },

lib/src/core/transaction.dart

@@ -40,26 +40,33 @@ class Transaction {
   /// have already been sent by [from].
   final int? nonce;
 
+  final EtherAmount? maxPriorityFeePerGas;
+  final EtherAmount? maxFeePerGas;
+
   Transaction(
       {this.from,
       this.to,
       this.maxGas,
       this.gasPrice,
       this.value,
       this.data,
-      this.nonce});
+      this.nonce,
+      this.maxFeePerGas,
+      this.maxPriorityFeePerGas});
 
   /// Constructs a transaction that can be used to call a contract function.
-  Transaction.callContract({
-    required DeployedContract contract,
-    required ContractFunction function,
-    required List<dynamic> parameters,
-    this.from,
-    this.maxGas,
-    this.gasPrice,
-    this.value,
-    this.nonce,
-  })  : to = contract.address,
+  Transaction.callContract(
+      {required DeployedContract contract,
+      required ContractFunction function,
+      required List<dynamic> parameters,
+      this.from,
+      this.maxGas,
+      this.gasPrice,
+      this.value,
+      this.nonce,
+      this.maxFeePerGas,
+      this.maxPriorityFeePerGas})
+      : to = contract.address,
         data = function.encodeCall(parameters);
 
   Transaction copyWith(
@@ -69,7 +76,9 @@ class Transaction {
       EtherAmount? gasPrice,
       EtherAmount? value,
       Uint8List? data,
-      int? nonce}) {
+      int? nonce,
+      EtherAmount? maxPriorityFeePerGas,
+      EtherAmount? maxFeePerGas}) {
     return Transaction(
       from: from ?? this.from,
       to: to ?? this.to,
@@ -78,6 +87,10 @@ class Transaction {
       value: value ?? this.value,
       data: data ?? this.data,
       nonce: nonce ?? this.nonce,
+      maxFeePerGas: maxFeePerGas ?? this.maxFeePerGas,
+      maxPriorityFeePerGas: maxPriorityFeePerGas ?? this.maxPriorityFeePerGas,
     );
   }
+
+  bool get isEIP1559 => maxFeePerGas != null && maxPriorityFeePerGas != null;
 }

lib/src/core/transaction_information.dart

@@ -87,6 +87,7 @@ class TransactionReceipt {
       this.from,
       this.to,
       this.gasUsed,
+      this.effectiveGasPrice,
       this.logs = const []});
 
   TransactionReceipt.fromMap(Map<String, dynamic> map)
@@ -105,6 +106,10 @@ class TransactionReceipt {
         cumulativeGasUsed = hexToInt(map['cumulativeGasUsed'] as String),
         gasUsed =
             map['gasUsed'] != null ? hexToInt(map['gasUsed'] as String) : null,
+        effectiveGasPrice = map['effectiveGasPrice'] != null
+            ? EtherAmount.inWei(
+                BigInt.parse(map['effectiveGasPrice'] as String))
+            : null,
         contractAddress = map['contractAddress'] != null
             ? EthereumAddress.fromHex(map['contractAddress'] as String)
             : null,
@@ -153,13 +158,16 @@ class TransactionReceipt {
   /// Array of logs generated by this transaction.
   final List<FilterEvent> logs;
 
+  final EtherAmount? effectiveGasPrice;
+
   @override
   String toString() {
     return 'TransactionReceipt{transactionHash: ${bytesToHex(transactionHash)}, '
         'transactionIndex: $transactionIndex, blockHash: ${bytesToHex(blockHash)}, '
         'blockNumber: $blockNumber, from: ${from?.hex}, to: ${to?.hex}, '
         'cumulativeGasUsed: $cumulativeGasUsed, gasUsed: $gasUsed, '
-        'contractAddress: ${contractAddress?.hex}, status: $status, logs: $logs}';
+        'contractAddress: ${contractAddress?.hex}, status: $status, '
+        'effectiveGasPrice: $effectiveGasPrice, logs: $logs}';
   }
 
   @override
@@ -177,6 +185,7 @@ class TransactionReceipt {
           gasUsed == other.gasUsed &&
           contractAddress == other.contractAddress &&
           status == other.status &&
+          effectiveGasPrice == other.effectiveGasPrice &&
           const ListEquality().equals(logs, other.logs);
 
   @override
@@ -191,5 +200,6 @@ class TransactionReceipt {
       gasUsed.hashCode ^
       contractAddress.hashCode ^
       status.hashCode ^
+      effectiveGasPrice.hashCode ^
       logs.hashCode;
 }

lib/src/core/transaction_signer.dart

@@ -23,18 +23,23 @@ Future<_SigningInput> _fillMissingData({
 
   final sender = transaction.from ?? await credentials.extractAddress();
   var gasPrice = transaction.gasPrice;
-  var nonce = transaction.nonce;
-  if (gasPrice == null || nonce == null) {
-    if (client == null) {
-      throw ArgumentError("Can't find suitable gas price and nonce from client "
-          'because no client is set. Please specify a gas price on the '
-          'transaction.');
-    }
-    gasPrice ??= await client.getGasPrice();
-    nonce ??= await client.getTransactionCount(sender,
-        atBlock: const BlockNum.pending());
+
+  if (client == null &&
+          (transaction.nonce == null ||
+              transaction.maxGas == null ||
+              loadChainIdFromNetwork) ||
+      (!transaction.isEIP1559 && gasPrice == null)) {
+    throw ArgumentError('Client is required to perform network actions');
+  }
+
+  if (!transaction.isEIP1559 && gasPrice == null) {
+    gasPrice = await client!.getGasPrice();
   }
 
+  final nonce = transaction.nonce ??
+      await client!
+          .getTransactionCount(sender, atBlock: const BlockNum.pending());
+
   final maxGas = transaction.maxGas ??
       await client!
           .estimateGas(
@@ -43,6 +48,8 @@ Future<_SigningInput> _fillMissingData({
             data: transaction.data,
             value: transaction.value,
             gasPrice: gasPrice,
+            maxPriorityFeePerGas: transaction.maxPriorityFeePerGas,
+            maxFeePerGas: transaction.maxFeePerGas,
           )
           .then((bigInt) => bigInt.toInt());
 
@@ -60,12 +67,7 @@ Future<_SigningInput> _fillMissingData({
   if (!loadChainIdFromNetwork) {
     resolvedChainId = chainId!;
   } else {
-    if (client == null) {
-      throw ArgumentError(
-          "Can't load chain id from network when no client is set");
-    }
-
-    resolvedChainId = await client.getNetworkId();
+    resolvedChainId = await client!.getNetworkId();
   }
 
   return _SigningInput(
@@ -75,8 +77,27 @@ Future<_SigningInput> _fillMissingData({
   );
 }
 
+Uint8List prependTransactionType(int type, Uint8List transaction) {
+  return Uint8List(transaction.length + 1)
+    ..[0] = type
+    ..setAll(1, transaction);
+}
+
 Future<Uint8List> _signTransaction(
     Transaction transaction, Credentials c, int? chainId) async {
+  if (transaction.isEIP1559 && chainId != null) {
+    final encodedTx = LengthTrackingByteSink();
+    encodedTx.addByte(0x02);
+    encodedTx.add(rlp
+        .encode(_encodeEIP1559ToRlp(transaction, null, BigInt.from(chainId))));
+
+    encodedTx.close();
+    final signature = await c.signToSignature(encodedTx.asBytes(),
+        chainId: chainId, isEIP1559: transaction.isEIP1559);
+
+    return uint8ListFromList(rlp.encode(
+        _encodeEIP1559ToRlp(transaction, signature, BigInt.from(chainId))));
+  }
   final innerSignature =
       chainId == null ? null : MsgSignature(BigInt.zero, BigInt.zero, chainId);
 
@@ -87,6 +108,38 @@ Future<Uint8List> _signTransaction(
   return uint8ListFromList(rlp.encode(_encodeToRlp(transaction, signature)));
 }
 
+List<dynamic> _encodeEIP1559ToRlp(
+    Transaction transaction, MsgSignature? signature, BigInt chainId) {
+  final list = [
+    chainId,
+    transaction.nonce,
+    transaction.maxPriorityFeePerGas!.getInWei,
+    transaction.maxFeePerGas!.getInWei,
+    transaction.maxGas,
+  ];
+
+  if (transaction.to != null) {
+    list.add(transaction.to!.addressBytes);
+  } else {
+    list.add('');
+  }
+
+  list
+    ..add(transaction.value?.getInWei)
+    ..add(transaction.data);
+
+  list.add([]); // access list
+
+  if (signature != null) {
+    list
+      ..add(signature.v)
+      ..add(signature.r)
+      ..add(signature.s);
+  }
+
+  return list;
+}
+
 List<dynamic> _encodeToRlp(Transaction transaction, MsgSignature? signature) {
   final list = [
     transaction.nonce,