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How to Do Logging on Solidity Contract With Truffle Suite

 3 years ago
source link: https://happy123.me/blog/2020/07/17/how-to-debug-solidity-contract-on-truffle-suite/
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How to Do Logging on Solidity Contract With Truffle Suite

Jul 17th, 2020 | Comments

Ethereum的智能合约调试起来很麻烦，到目前为止还是没有一个方便的类似于console.log()或printf的调用；

一般都是通过Event的方法来打印log；这种办法在写单元测试的时候很麻烦；

目前最接近于官方的手段是构造一个公用的Console库合约，然后链接到主合约里面来用；

https://github.com/trufflesuite/truffle-logger-example

这个PR一直没有Merge到TruffleSuite的新版本中，我们只能先临时手工Copy下代码来Monkey Patch一下；

步骤如下：

  • 首先在主合约的同级目录添加Console.sol合约:
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wget https://raw.githubusercontent.com/trufflesuite/truffle/truffleLogger/packages/core/lib/logging/Console.sol
  • 然后在部署脚本里面增加这个库的链接(以官方示例MetaCoin为例)
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$ vim migrations/2_deploy_contracts.js
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const Console = artifacts.require("Console");
const MetaCoin = artifacts.require("MetaCoin");

module.exports = function(deployer) {
      deployer.deploy(Console);
        deployer.link(Console, MetaCoin);
          deployer.deploy(MetaCoin);
          };
  • 在需要打印log的单元测试中引入Console.sol
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$ vim test/TestMetaCoin.sol
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import "../contracts/Console.sol";

.....
    console.log("xxxxxx");

Posted by brain-zhang

Jul 17th, 2020blockchain

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