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.
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 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 // [!code highlight]
Transaction hash: 0x2d40c53b493556463a28c458e40bc455a248df69a10679bef84145974b7424f3
Overwrite the RECEIVER_ADDRESS environment variable with the new address:
export RECEIVER_ADDRESS=0x5aa01B3b5877255cE50cc55e8986a7a5fe29C70e
