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Refactor signing/sending transactions

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This commit is contained in:
OmarHatem 2023-06-06 04:34:11 +03:00
parent 8b384e91dc
commit cd206d730a
4 changed files with 70 additions and 226 deletions
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108
assets/abi_json/erc20_abi.json
View file

@ -1,108 +0,0 @@
[
{
"constant": true,
"inputs": [],
"name": "name",
"outputs": [
{
"name": "",
"type": "string"
}
],
"payable": false,
"stateMutability": "view",
"type": "function"
},
{
"constant": true,
"inputs": [],
"name": "symbol",
"outputs": [
{
"name": "",
"type": "string"
}
],
"payable": false,
"stateMutability": "view",
"type": "function"
},
{
"constant": true,
"inputs": [],
"name": "decimals",
"outputs": [
{
"name": "",
"type": "uint8"
}
],
"payable": false,
"stateMutability": "view",
"type": "function"
},
{
"constant": true,
"inputs": [
{
"name": "_owner",
"type": "address"
}
],
"name": "balanceOf",
"outputs": [
{
"name": "balance",
"type": "uint256"
}
],
"payable": false,
"stateMutability": "view",
"type": "function"
},
{
"constant": false,
"inputs": [
{
"name": "_to",
"type": "address"
},
{
"name": "_value",
"type": "uint256"
}
],
"name": "transfer",
"outputs": [
{
"name": "",
"type": "bool"
}
],
"payable": false,
"stateMutability": "nonpayable",
"type": "function"
},
{
"anonymous": false,
"inputs": [
{
"indexed": true,
"name": "_from",
"type": "address"
},
{
"indexed": true,
"name": "_to",
"type": "address"
},
{
"indexed": false,
"name": "_value",
"type": "uint256"
}
],
"name": "Transfer",
"type": "event"
}
]

185
cw_ethereum/lib/ethereum_client.dart
View file

@ -6,6 +6,7 @@ import 'package:cw_ethereum/pending_ethereum_transaction.dart';
import 'package:flutter/services.dart';
import 'package:http/http.dart';
import 'package:web3dart/web3dart.dart';
import 'package:web3dart/contracts/erc20.dart';
import 'package:cw_core/node.dart';
import 'package:cw_ethereum/ethereum_transaction_priority.dart';
@ -64,76 +65,44 @@ class EthereumClient {
final price = await _client!.getGasPrice();
final Transaction transaction;
final Transaction transaction = Transaction(
from: privateKey.address,
to: EthereumAddress.fromHex(toAddress),
maxGas: gas,
gasPrice: price,
value: _isEthereum ? EtherAmount.inWei(BigInt.parse(amount)) : EtherAmount.zero(),
);
final signedTransaction = await _client!.signTransaction(privateKey, transaction);
final Function _sendTransaction;
if (_isEthereum) {
transaction = Transaction(
from: privateKey.address,
to: EthereumAddress.fromHex(toAddress),
maxGas: gas,
gasPrice: price,
value: EtherAmount.inWei(BigInt.parse(amount)),
);
_sendTransaction = () async => await sendTransaction(signedTransaction);
} else {
/// ERC-20 currency
final String abi = await rootBundle.loadString("assets/abi_json/erc20_abi.json");
final contractAbi = ContractAbi.fromJson(abi, "ERC20");
final contract = DeployedContract(
contractAbi,
EthereumAddress.fromHex(_erc20Currencies[currency]!),
final erc20 = Erc20(
client: _client!,
address: EthereumAddress.fromHex(_erc20Currencies[currency]!),
);
final originalAmount = BigInt.parse(amount) / BigInt.from(pow(10, 18));
int exponent = await _getDecimalPlacesForContract(contract);
final int exponent = (await erc20.decimals()).toInt();
final _amount = BigInt.from(originalAmount * pow(10, exponent));
final transferFunction = contract.function('transfer');
final transferData =
transferFunction.encodeCall([EthereumAddress.fromHex(toAddress), _amount]);
transaction = Transaction(
from: privateKey.address,
to: contract.address,
maxGas: gas,
gasPrice: price,
value: EtherAmount.zero(),
data: transferData,
);
// transaction = Transaction.callContract(
// contract: contract,
// function: transferFunction,
// parameters: [EthereumAddress.fromHex(toAddress), _amount],
// from: privateKey.address,
// maxGas: gas,
// gasPrice: price,
// value: EtherAmount.inWei(_amount),
// );
print("^^^^^^^^^^^^^^^^^^");
print(transaction);
print(transaction.maxGas);
print(transaction.gasPrice);
print(transaction.value);
print("^^^^^^^^^^^^^^^^^^");
print(exponent);
print(originalAmount * pow(10, exponent));
print(_amount);
print((BigInt.from(transaction.maxGas!) * transaction.gasPrice!.getInWei) +
transaction.value!.getInWei);
sendERC20Token(EthereumAddress.fromHex(toAddress), currency, BigInt.parse(amount));
_sendTransaction = () async {
await erc20.transfer(
EthereumAddress.fromHex(toAddress),
_amount,
credentials: privateKey,
);
};
}
final signedTransaction = await _client!.signTransaction(privateKey, transaction);
return PendingEthereumTransaction(
signedTransaction: signedTransaction,
amount: amount,
fee: estimatedGas * price.getInWei,
sendTransaction: () => sendTransaction(signedTransaction),
sendTransaction: _sendTransaction,
);
}
@ -197,35 +166,19 @@ I/flutter ( 4474): Gas Used: 53000
// }
Future<Map<CryptoCurrency, ERC20Balance>> fetchERC20Balances(EthereumAddress userAddress) async {
final String abi = await rootBundle.loadString("assets/abi_json/erc20_abi.json");
final contractAbi = ContractAbi.fromJson(abi, "ERC20");
final Map<CryptoCurrency, ERC20Balance> erc20Balances = {};
for (var currency in _erc20Currencies.keys) {
final contractAddress = _erc20Currencies[currency]!;
try {
final contract = DeployedContract(
contractAbi,
EthereumAddress.fromHex(contractAddress),
);
final erc20 = Erc20(address: EthereumAddress.fromHex(contractAddress), client: _client!);
final balance = await erc20.balanceOf(userAddress);
final balanceFunction = contract.function('balanceOf');
final balance = await _client!.call(
contract: contract,
function: balanceFunction,
// test address: 0x1715a3E4A142d8b698131108995174F37aEBA10D
params: [userAddress],
);
int exponent = (await erc20.decimals()).toInt();
BigInt tokenBalance = BigInt.parse(balance.first.toString());
int exponent = await _getDecimalPlacesForContract(contract);
erc20Balances[currency] = ERC20Balance(tokenBalance, exponent: exponent);
} catch (e, s) {
print(e);
print(s);
erc20Balances[currency] = ERC20Balance(balance, exponent: exponent);
} catch (e) {
continue;
}
}
@ -233,43 +186,43 @@ I/flutter ( 4474): Gas Used: 53000
return erc20Balances;
}
Future<bool> sendERC20Token(
EthereumAddress to, CryptoCurrency erc20Currency, BigInt amount) async {
if (_erc20Currencies[erc20Currency] == null) {
throw "Unsupported ERC20 token";
}
try {
final String abi = await rootBundle.loadString("assets/abi_json/erc20_abi.json");
final contractAbi = ContractAbi.fromJson(abi, "ERC20");
final contract = DeployedContract(
contractAbi,
EthereumAddress.fromHex(_erc20Currencies[erc20Currency]!),
);
final transferFunction = contract.function('transfer');
final success = await _client!.call(
contract: contract,
function: transferFunction,
params: [to, amount],
);
return success.first as bool;
} catch (e) {
return false;
}
}
Future<int> _getDecimalPlacesForContract(DeployedContract contract) async {
final decimalsFunction = contract.function('decimals');
final decimals = await _client!.call(
contract: contract,
function: decimalsFunction,
params: [],
);
int exponent = int.parse(decimals.first.toString());
return exponent;
}
// Future<bool> sendERC20Token(
// EthereumAddress to, CryptoCurrency erc20Currency, BigInt amount) async {
// if (_erc20Currencies[erc20Currency] == null) {
// throw "Unsupported ERC20 token";
// }
//
// try {
// final String abi = await rootBundle.loadString("assets/abi_json/erc20_abi.json");
// final contractAbi = ContractAbi.fromJson(abi, "ERC20");
//
// final contract = DeployedContract(
// contractAbi,
// EthereumAddress.fromHex(_erc20Currencies[erc20Currency]!),
// );
//
// final transferFunction = contract.function('transfer');
// final success = await _client!.call(
// contract: contract,
// function: transferFunction,
// params: [to, amount],
// );
//
// return success.first as bool;
// } catch (e) {
// return false;
// }
// }
//
// Future<int> _getDecimalPlacesForContract(DeployedContract contract) async {
// final decimalsFunction = contract.function('decimals');
// final decimals = await _client!.call(
// contract: contract,
// function: decimalsFunction,
// params: [],
// );
//
// int exponent = int.parse(decimals.first.toString());
// return exponent;
// }
}

2
cw_ethereum/lib/pending_ethereum_transaction.dart
View file

@ -22,7 +22,7 @@ class PendingEthereumTransaction with PendingTransaction {
EtherAmount.inWei(BigInt.parse(amount)).getValueInUnit(EtherUnit.ether).toString();
@override
Future<void> commit() async => sendTransaction();
Future<void> commit() async => await sendTransaction();
@override
String get feeFormatted => EtherAmount.inWei(fee).getValueInUnit(EtherUnit.ether).toString();

1
pubspec_base.yaml
View file

@ -122,7 +122,6 @@ flutter:
- assets/text/
- assets/faq/
- assets/animation/
- assets/abi_json/
fonts:
- family: Lato