Call methods with struct parameters (ABIEncoderV2)

[Amxx]

What problem are you trying to solve?
I am trying to call a smart contract's method which arguments are/contain structs.

Contract is loaded and called using:

$.getJSON("contracts/test.json", json => {
    testInstance = web3.eth.contract(json.abi).at("0xBf...");
    testInstance.myMethod(JSON.stringify({ a: 17, b: 42, c: 0x0, d: "toto" }), { gas: 42000 });
});

Here is the relevant part of the ABI (description of myMethod)

{
	"constant": true,
	"inputs": [
		{
			"components": [
				{ "name": "a", "type": "uint256" },
				{ "name": "b", "type": "uint256" },
				{ "name": "c", "type": "bytes32" }
				{ "name": "d", "type": "string"  }
			],
			"name": "myStruct",
			"type": "tuple"
		}
	],
	"name": "myMethod",
	"outputs": [
		{ "name": "", "type": "bool" }
	],
	"payable": false,
	"stateMutability": "view",
	"type": "function"
}

The cosole gives me Uncaught Error: invalid solidity type!: tuple. I tryed with and without JSON.stringify.
Ideally I would need access something like web3.eth.abi.encodeParameters, but I don't see such a element in the web3 object provided by metamask.

Note: web3js support this feature since version 1.0.0-beta.36, when it pulled the abiEncoder from ethers.js.

Any plan to support structures in calls anytime soon?

Additional Infos
I am using metamask 4.12.0 on chrome

[danfinlay]

We do not currently support web3 1.0 since it depends on subscriptions & websockets. If their feature was added by including ethers.js, you could probably encode these parameters using the ethers.js library.

Closing as a duplicate of #3642.