Reading ABI encoded bytes with a struct within a struct

[dino-rodriguez]

I am trying to use ffi to read ABI encoded bytes in as a solidity struct. The javascript code to do the encoding is:

const encodedData = defaultAbiCoder.encode(
    [
      "uint256 width",
      "uint256 height",
      "tuple(bytes[] traits, string[] names, string[][][] palettes, string[][] paletteNames) backgrounds",
    ],
    [width, height, backgrounds]
  );

  // const decodedData = defaultAbiCoder.decode(
  //   [
  //     "uint256 width",
  //     "uint256 height",
  //     "tuple(bytes[] traits, string[] names, string[][][] palettes, string[][] paletteNames) backgrounds",
  //   ],
  //   encodedData
  // );

  // console.log(decodedData);
  process.stdout.write(encodedData);

backgrounds is an object of the form:

{
traits: ..,
names:..,
palettes:..,
paletteNames:..
}

Decoding this works in JS. In solidity, my forge script is:

contract LandscapesDeploy is Script {
  struct TraitData {
      bytes[] traits;
      string[] names;
      string[][][] palettes;
      string[][] paletteNames;
  }

  struct SvgData {
      uint256 width;
      uint256 height;
      TraitData backgrounds;
      // TraitData clouds;
      // TraitData lands;
      // TraitData planets;
  }

  function run() external {
      string[] memory inputs = new string[](2);
      inputs[0] = "node";
      inputs[1] = "scripts/Landscapes/abiEncodeData.js";
      bytes memory res = vm.ffi(inputs);
      SvgData memory svgData = abi.decode(res, (SvgData));
      console.log(svgData.height);
      console.log(svgData.width);

      // vm.startBroadcast();

      // Landscapes landscapes = new Landscapes();

      // vm.stopBroadcast();
  }
}

And this just errors with no output, even with -vvvv. When I'm just reading in width and height, there's no problem. But when I add in TraitData, it errors.

[onbjerg]

Can you provide some example data/a usage example? I'll check it out.

[dino-rodriguez]

I figured it out. In foundry I need to unpack it as a tuple. Not as a top-level struct.