feat: add unique id for sendToken tx

Signed-off-by: Jawad Tariq <[email protected]>
topos-protocol · Feb 15, 2024 · 40e8972 · 40e8972
1 parent d64e219
commit 40e8972
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Showing 2 changed files with 7 additions and 2 deletions.
diff --git a/contracts/interfaces/IToposCore.sol b/contracts/interfaces/IToposCore.sol
@@ -25,7 +25,7 @@ interface IToposCore {
 
     event CertStored(CertificateId certId, bytes32 receiptRoot);
 
-    event CrossSubnetMessageSent(SubnetId indexed targetSubnetId);
+    event CrossSubnetMessageSent(SubnetId indexed targetSubnetId, SubnetId sourceSubnetId, uint256 nonce);
 
     event Upgraded(address indexed implementation);
 

diff --git a/contracts/topos-core/ToposCore.sol b/contracts/topos-core/ToposCore.sol
@@ -18,6 +18,10 @@ contract ToposCore is IToposCore, AdminMultisigBase, Initializable {
     /// @notice The subnet ID of the subnet this contract is to be deployed on
     SubnetId public networkSubnetId;
 
+    /// @notice Nonce for cross subnet message, meant to be used in combination with `sourceSubnetId`
+    /// so that the message can be uniquely identified per subnet
+    uint256 private nonce;
+
     /// @notice Set of certificate IDs
     Bytes32SetsLib.Set certificateSet;
 
@@ -113,7 +117,8 @@ contract ToposCore is IToposCore, AdminMultisigBase, Initializable {
     /// @notice Emits an event to signal a cross subnet message has been sent
     /// @param targetSubnetId The subnet ID of the target subnet
     function emitCrossSubnetMessage(SubnetId targetSubnetId) external {
-        emit CrossSubnetMessageSent(targetSubnetId);
+        nonce += 1;
+        emit CrossSubnetMessageSent(targetSubnetId, networkSubnetId, nonce);
     }
 
     /// @notice Returns the admin epoch