Contract Source Code (Solidity)

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Outline

• interface IStateReceiver
•    - function onStateReceive(uint256 state ...
• interface IFxMessageProcessor
•    - function processMessageFromRoot(uint2 ...
•  contract FxChild is IStateReceiver *
•    - function setFxRoot(address _fxRoot)
•    - function onStateReceive(uint256 state ...

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/**
 *Submitted for verification at polygonscan.com on 2021-06-30
*/

// SPDX-License-Identifier: MIT
pragma solidity 0.7.3;

// IStateReceiver represents interface to receive state
interface IStateReceiver {
    function onStateReceive(uint256 stateId, bytes calldata data) external;
}

// IFxMessageProcessor represents interface to process message
interface IFxMessageProcessor {
    function processMessageFromRoot(uint256 stateId, address rootMessageSender, bytes calldata data) external;
}

/**
 * @title FxChild child contract for state receiver
 */
contract FxChild is IStateReceiver {
    address public fxRoot;

    event NewFxMessage(address rootMessageSender, address receiver, bytes data);

    function setFxRoot(address _fxRoot) public {
        require(fxRoot == address(0x0));
        fxRoot = _fxRoot;
    }

    function onStateReceive(uint256 stateId, bytes calldata _data) external override {
        require(msg.sender == address(0x0000000000000000000000000000000000001001), "Invalid sender");
        (address rootMessageSender, address receiver, bytes memory data) = abi.decode(_data, (address, address, bytes));
        emit NewFxMessage(rootMessageSender, receiver, data);
        IFxMessageProcessor(receiver).processMessageFromRoot(stateId, rootMessageSender, data);
    }
}

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[{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"rootMessageSender","type":"address"},{"indexed":false,"internalType":"address","name":"receiver","type":"address"},{"indexed":false,"internalType":"bytes","name":"data","type":"bytes"}],"name":"NewFxMessage","type":"event"},{"inputs":[],"name":"fxRoot","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"stateId","type":"uint256"},{"internalType":"bytes","name":"_data","type":"bytes"}],"name":"onStateReceive","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_fxRoot","type":"address"}],"name":"setFxRoot","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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