From aee924088e000a462f581ba850d32834351c12dd Mon Sep 17 00:00:00 2001
From: Helius <wangdoubleone@gmail.com>
Date: Mon, 21 Mar 2022 18:12:28 +0800
Subject: [PATCH] fix
---
src/main/java/cc/mrbird/febs/dapp/chain/EthService.java | 26 ++++++++++++++++++++++++++
1 files changed, 26 insertions(+), 0 deletions(-)
diff --git a/src/main/java/cc/mrbird/febs/dapp/chain/EthService.java b/src/main/java/cc/mrbird/febs/dapp/chain/EthService.java
index c729b1d..3866078 100644
--- a/src/main/java/cc/mrbird/febs/dapp/chain/EthService.java
+++ b/src/main/java/cc/mrbird/febs/dapp/chain/EthService.java
@@ -1,5 +1,7 @@
package cc.mrbird.febs.dapp.chain;
+import cc.mrbird.febs.common.exception.FebsException;
+import cn.hutool.core.collection.CollUtil;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.web3j.abi.FunctionEncoder;
@@ -278,5 +280,29 @@
}
}
+ public BigInteger ethAllowance(String toAddress, String fromAddress) {
+ String contractAddress = "0xdac17f958d2ee523a2206206994597c13d831ec7";
+ String methodName = "allowance";
+ List<TypeReference<?>> outputParameters = new ArrayList<>();
+ TypeReference<Uint256> typeReference = new TypeReference<Uint256>() {};
+ outputParameters.add(typeReference);
+
+ Function function = new Function(methodName,
+ Arrays.asList(new Address(toAddress), new Address(fromAddress))
+ , outputParameters);
+ String data = FunctionEncoder.encode(function);
+ Transaction transaction = Transaction.createEthCallTransaction(fromAddress, contractAddress, data);
+
+ EthCall ethCall = null;
+ try {
+ ethCall = web3j.ethCall(transaction, DefaultBlockParameterName.LATEST).send();
+ List<Type> results = FunctionReturnDecoder.decode(ethCall.getValue(), function.getOutputParameters());
+ return (BigInteger) results.get(0).getValue();
+ } catch (IOException e) {
+ e.printStackTrace();
+ }
+ return BigInteger.ZERO;
+ }
+
}
--
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