Set the nameTags before tracing a transaction?

[a2468834]

Hello everyone,

I have already tried the command npx hardhat test --fulltrace with setting addresses nameTags. It works great and highly readable. This tool truly helps me a lot!

However, when I tried to run a script with npx hardhat run, nameTags doesn't work. Here are the descriptions of what I tried:

(1) I have set up a Hardhat Network with mainnet forking mode. (2) Because I only have Alchemy free account, I cannot use the debug API (e.g., debug_traceTransaction). (3) As a result, I set up a Hardhat Network with forking. Then, I ran another project which is connected to the Hardhat Network and sent transactions to that network. (4) When I tried to use npx hardhat trace --hash 0x... command, the addresses cannot display with the nameTags.

---

For example, the directory structure: (omitted trivial folders/files)

 ├── 📂 hardhat_network_w_forking
 └── 📂 another_project
      ├── 📄 contract.sol
      ├── 📄 hardhat.config.js
      └── 📄 script.js

(1) I ran npx hardhat --network "hardhat" node command in the 📂hardhat_network_w_forking. The default JSON-RPC URL is http://127.0.0.1:8545.

(2) hardhat.config.js in the 📂another_project:

require("hardhat-tracer");

module.exports = {
...
    mynet: {
        url: "http://127.0.0.1:8545",
...
};

(3) contract.sol in the 📂another_project:

import "WETH9-abi.sol";
contract C {
    uint256 public dummy;

    function foo() public {
        WETH9(0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2).balanceOf(address(this));
        dummy = 3; // Let foo() be a non read-only function
    }

(4) script.js in the 📂another_project:

async function main() {
    ... // Deploy contract C

    const weth9_address = "0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2";
    hre.tracer.nameTags[weth9_address] = "WrappedEther";

    ... // Invoke C.foo() by sending a transaction to "mynet"
}
main();

(5) Finally, I ran the following commands in the 📂another_project.

$ npx hardhat --network "mynet" run script.js
...
"transactionHash": "0xdf85...",
...
$ npx hardhat --network "mynet" trace --hash "0xdf85..."
CALL C.foo()
   STATICCALL <UnknownContract 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2>.balanceOf(owner=0x5302...) => (0)

(6) But, if I ran the same script with npx hardhat test --trace, I would get:

CALL C.foo()
   STATICCALL WrappedEther.balanceOf(owner=0x5302...) => (0)

In short, hre.tracer.nameTags[weth9_address] = "WrappedEther"; doesn't work when running the combination of npx hardhat run and npx hardhat trace --hash "0x...".

---

Could anyone tell me how should I do to solve this problem? Many thanks.

[zemse]

Just added the ability to specify nameTags in config available in hardhat-tracer@1.1.0-rc.4. So the addresses specified in config should be available in the scripts as well as the trace task. Let me know if it works or if any issue.

tracer: {
    nameTags: {
        '0xf39fd6e51aad88f6f4ce6ab8827279cfffb92266': 'MyContract',
        [wethAddress]: 'WrappedEther',
    },
},

[a2468834]

Awesome! The functionalities work pretty well in hardhat-tracer@1.1.0-rc.6.

I also found that if I have compiled the contracts (which are involved in the transaction), the output result would be automatically converted into contract ABI's format.🤩