Create Simple Calculator Receiver

Create a contract that receives multiple parameters and execute a function

On our Avalanche L1, we need to create the receiver part of our cross-chain calculator. It will receive two numbers and store the result.

Create Receiver Contract

src/02a-encoding-multiple-paramters/SimpleCalculatorReceiverOnSubnet.sol

pragma solidity ^0.8.18;
 
import "@teleporter/ITeleporterMessenger.sol";
import "@teleporter/ITeleporterReceiver.sol";
 
contract SimpleCalculatorReceiverOnSubnet is ITeleporterReceiver {
    ITeleporterMessenger public immutable teleporterMessenger =
        ITeleporterMessenger(0x253b2784c75e510dD0fF1da844684a1aC0aa5fcf);
 
    uint256 public result_num;
 
    function receiveTeleporterMessage(bytes32, address, bytes calldata message) external {
        // Only the Interchain Messaging receiver can deliver a message.
        require(
            msg.sender == address(teleporterMessenger), "CalculatorReceiverOnSubnet: unauthorized TeleporterMessenger"
        );
 
        (uint256 a, uint256 b) = abi.decode(message, (uint256, uint256)); 
        _calculatorAdd(a, b);
    }
 
    function _calculatorAdd(uint256 _num1, uint256 _num2) internal {
        result_num = _num1 + _num2;
    }
}

Deploy the Receiver Contract

Deploy the receiver contract on your Avalanche L1:

forge create --rpc-url myblockchain --private-key $PK contracts/interchain-messaging/invoking-functions/SimpleCalculatorReceiverOnSubnet.sol:SimpleCalculatorReceiverOnSubnet

[⠊] Compiling...
[⠒] Compiling 1 files with Solc 0.8.18
[⠢] Solc 0.8.18 finished in 44.12ms
Compiler run successful!
Deployer: 0x8db97C7cEcE249c2b98bDC0226Cc4C2A57BF52FC
Deployed to: 0x5aa01B3b5877255cE50cc55e8986a7a5fe29C70e
Transaction hash: 0x2d40c53b493556463a28c458e40bc455a248df69a10679bef84145974b7424f3

Save the Receiver Contract Address

Overwrite the RECEIVER_ADDRESS environment variable with the new address:

export RECEIVER_ADDRESS=0x5aa01B3b5877255cE50cc55e8986a7a5fe29C70e

Create Simple Calculator Receiver

Create Receiver Contract

Deploy the Receiver Contract

Save the Receiver Contract Address

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