/
MessageReceiverAdapter.sol
85 lines (74 loc) · 3.68 KB
/
MessageReceiverAdapter.sol
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
// SPDX-License-Identifier: GPL-3.0-only
pragma solidity >=0.8.9;
import "../../framework/MessageApp.sol";
import "../../../safeguard/Pauser.sol";
import "../../../safeguard/DelayedMessage.sol";
// A HelloWorld example for basic cross-chain message passing
contract MessageReceiverAdapter is MessageApp, DelayedMessage, Pauser {
event MessageReceived(address srcContract, uint64 srcChainId, address dstContract, bytes callData);
event AllowedSenderUpdated(address dstContract, uint64 srcChainId, address srcContract, bool allowed);
// dstContract => srcChainId => srcContract => allowed or not
mapping(address => mapping(uint64 => mapping(address => bool))) public allowedSender;
constructor(address _messageBus) MessageApp(_messageBus) {}
// called by MessageBus on destination chain to receive cross-chain messages
function executeMessage(
address _srcContract,
uint64 _srcChainId,
bytes calldata _message,
address // executor
) external payable override onlyMessageBus whenNotPaused returns (ExecutionStatus) {
(address dstContract, bytes memory callData) = abi.decode(_message, (address, bytes));
require(allowedSender[dstContract][_srcChainId][_srcContract], "not allowed sender");
bool delay = delayPeriod > 0 ? true : false;
if (delay) {
_addDelayedMessage(_srcContract, _srcChainId, dstContract, callData);
return ExecutionStatus.Success;
}
emit MessageReceived(_srcContract, _srcChainId, dstContract, callData);
return externalCall(dstContract, callData);
}
function executeDelayedMessage(
address _srcContract,
uint64 _srcChainId,
address _dstContract,
bytes calldata _callData,
uint32 _nonce
) external payable whenNotPaused {
_executeDelayedMessage(_srcContract, _srcChainId, _dstContract, _callData, _nonce);
externalCall(_dstContract, _callData);
emit MessageReceived(_srcContract, _srcChainId, _dstContract, _callData);
}
// as long as external call is good, execution status would be considered always as Success.
function externalCall(address _dstContract, bytes memory _callData) internal returns (ExecutionStatus) {
(bool ok, bytes memory returnData) = _dstContract.call{value: msg.value}(_callData);
if (!ok) {
// Bubble up the revert from the returnData
revert(getRevertMsg(returnData));
}
return ExecutionStatus.Success;
}
// https://ethereum.stackexchange.com/a/83577
// https://github.com/Uniswap/v3-periphery/blob/v1.0.0/contracts/base/Multicall.sol
function getRevertMsg(bytes memory _returnData) private pure returns (string memory) {
// If the _res length is less than 68, then the transaction failed silently (without a revert message)
if (_returnData.length < 68) return "Transaction reverted silently";
assembly {
// Slice the sighash.
_returnData := add(_returnData, 0x04)
}
return abi.decode(_returnData, (string)); // All that remains is the revert string
}
// =============== Admin operation ===============
function setAllowedSender(
address _dstContract,
uint64 _srcChainId,
address[] calldata _srcContracts,
bool[] calldata _alloweds
) external onlyOwner {
require(_srcContracts.length == _alloweds.length, "length mismatch");
for (uint256 i = 0; i < _srcContracts.length; i++) {
allowedSender[_dstContract][_srcChainId][_srcContracts[i]] = _alloweds[i];
emit AllowedSenderUpdated(_dstContract, _srcChainId, _srcContracts[i], _alloweds[i]);
}
}
}