feat: depositMessageCount to be derived from depositMessageNonce in publicInput and messageQueue headIndex for NilRollup

Author: defistar

rollup-bridge-contracts/contracts/NilRollup.sol

@@ -21,6 +21,7 @@ import { INilRollup } from "../../interfaces/INilRollup.sol";
 import { INilGasPriceOracle } from "./interfaces/INilGasPriceOracle.sol";
 import { NilAccessControlUpgradeable } from "../../NilAccessControlUpgradeable.sol";
 import { IL2BridgeMessenger } from "../l2/interfaces/IL2BridgeMessenger.sol";
+import "forge-std/console.sol";
 
 contract L1BridgeMessenger is
   OwnableUpgradeable,
@@ -544,4 +545,9 @@ contract L1BridgeMessenger is
   ) public view override(AccessControlEnumerableUpgradeable, IERC165) returns (bool) {
     return interfaceId == type(IL1BridgeMessenger).interfaceId || super.supportsInterface(interfaceId);
   }
+
+  function getQueueHeadIndex() external view override returns (uint256) {
+    console.log("L1BridgeMessener - QueueHeadIndex call");
+    return messageQueue.getFirstUnprocessedMessageHash();
+  }
 }

rollup-bridge-contracts/contracts/bridge/l1/L1BridgeMessenger.sol

@@ -174,4 +174,6 @@ interface IL1BridgeMessenger is IBridgeMessenger, IRelayMessage {
   /// @param messageCount number of messages to be removed from the queue
   /// @return messageHashes array of messageHashes start from the head of queue
   function popMessages(uint256 messageCount) external returns (bytes32[] memory);
+
+  function getQueueHeadIndex() external view returns (uint256);
 }

rollup-bridge-contracts/contracts/bridge/l1/interfaces/IL1BridgeMessenger.sol

@@ -418,4 +418,9 @@ contract L2BridgeMessenger is
   function getL2ToL1Root() external view override returns (bytes32) {
     return INilMessageTree(nilMessageTree).getMessageRoot();
   }
+
+  /// @inheritdoc IL2BridgeMessenger
+  function getLatestDepositNonce() external view returns (uint256) {
+    return relayedMessageHashStore.length();
+  }
 }

rollup-bridge-contracts/contracts/bridge/l2/L2BridgeMessenger.sol

@@ -170,4 +170,6 @@ interface IL2BridgeMessenger is IBridgeMessenger, IRelayMessage {
   function setPause(bool _status) external;
 
   function getL2ToL1Root() external view returns (bytes32);
+
+  function getLatestDepositNonce() external view returns (uint256);
 }