Proxy Contract _delegatecall return data

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Hi @cjd9s,

You can use the ABI of the implementation contract with the address of the proxy to interact with the proxy contract.

In Remix I deployed the Box contract as my implementation contract and then deployed the TransparentUpgradeableProxy using the address of the Box contract, an other address as the admin and initializing with 0x6057361d000000000000000000000000000000000000000000000000000000000000002a
(which is calling store with the value 42).

I then used Remix to interact with a Box contract using the address of the proxy I just deployed.

Box.sol

// contracts/Box.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.6.0;

contract Box {
    uint256 private value;

    // Emitted when the stored value changes
    event ValueChanged(uint256 newValue);

    // Stores a new value in the contract
    function store(uint256 newValue) public {
        value = newValue;
        emit ValueChanged(newValue);
    }

    // Reads the last stored value
    function retrieve() public view returns (uint256) {
        return value;
    }
}

OpenZeppelinContracts.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.6.2;

import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/v3.2.0/contracts/proxy/TransparentUpgradeableProxy.sol";

MyContract

I used the following to encode the initialization 0x6057361d000000000000000000000000000000000000000000000000000000000000002a

// SPDX-License-Identifier: MIT
pragma solidity ^0.6.0;

contract MyContract {
    
    function calculate() public pure returns (bytes memory) {
        uint256 value = 42;
        bytes memory payload = abi.encodeWithSignature("store(uint256)", value);

        return payload;
    }
}