feat(protocol): trigger simultaneous recurring TKO snapshots

packages/protocol/contracts/L1/TaikoData.sol

@@ -153,6 +153,13 @@ library TaikoData {
         uint64 lastUnpausedAt;
     }
 
+    struct SlotC {
+        uint64 lastSnapshot;
+        uint64 __reservedC1;
+        uint64 __reservedC2;
+        uint64 __reservedC3;
+    }
+
     /// @dev Struct holding the state variables for the {TaikoL1} contract.
     struct State {
         // Ring buffer for proposed blocks and a some recent verified blocks.
@@ -164,10 +171,10 @@ library TaikoData {
             uint64 blockId_mod_blockRingBufferSize
                 => mapping(uint32 transitionId => TransitionState ts)
             ) transitions;
-        // Ring buffer for Ether deposits
         bytes32 __reserve1;
         SlotA slotA; // slot 5
         SlotB slotB; // slot 6
-        uint256[44] __gap;
+        SlotC slotC; // slot 7
+        uint256[43] __gap;
     }
 }

packages/protocol/contracts/L1/TaikoToken.sol

@@ -53,7 +53,7 @@ contract TaikoToken is EssentialContract, ERC20SnapshotUpgradeable, ERC20VotesUp
     }
 
     /// @notice Creates a new token snapshot.
-    function snapshot() public onlyFromOwnerOrNamed(LibStrings.B_SNAPSHOOTER) returns (uint256) {
+    function snapshot() public onlyFromOwnerOrNamed(LibStrings.B_TAIKO) returns (uint256) {
         return _snapshot();
     }
 

packages/protocol/contracts/L1/libs/LibProposing.sol

@@ -4,6 +4,7 @@ pragma solidity 0.8.24;
 import "@openzeppelin/contracts/utils/cryptography/ECDSA.sol";
 import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
 import "../../common/IAddressResolver.sol";
+import "../../common/ISnapshot.sol";
 import "../../common/LibStrings.sol";
 import "../../libs/LibAddress.sol";
 import "../../libs/LibNetwork.sol";
@@ -228,6 +229,13 @@ library LibProposing {
             meta: meta_,
             depositsProcessed: deposits_
         });
+
+        // Take a snapshot every week
+        uint256 v = block.number / 50_400;
+        if (v > _state.slotC.lastSnapshot) {
+            _state.slotC.lastSnapshot = uint64(v);
+            ISnapshot(_resolver.resolve(LibStrings.B_TAIKO_TOKEN, false)).snapshot();
+        }
     }
 
     function _isProposerPermitted(

packages/protocol/contracts/L2/TaikoL2.sol

@@ -5,6 +5,7 @@ import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
 import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
 
 import "../common/EssentialContract.sol";
+import "../common/ISnapshot.sol";
 import "../common/LibStrings.sol";
 import "../libs/LibAddress.sol";
 import "../signal/ISignalService.sol";
@@ -49,6 +50,9 @@ contract TaikoL2 is EssentialContract {
     /// @notice The L1's chain ID.
     uint64 public l1ChainId;
 
+    /// @notice The last snapshot marker
+    uint64 public lastSnapshot;
+
     uint256[46] private __gap;
 
     /// @notice Emitted when the latest L1 block details are anchored to L2.
@@ -169,6 +173,16 @@ contract TaikoL2 is EssentialContract {
         gasExcess = _gasExcess;
 
         emit Anchored(_parentHash, _gasExcess);
+
+        // Take a snapshot every week
+        address taikoToken = resolve(LibStrings.B_TAIKO_TOKEN, true);
+        if (taikoToken != address(0)) {
+            uint256 v = _l1BlockId / 50_400;
+            if (v > lastSnapshot) {
+                lastSnapshot = uint64(v);
+                ISnapshot(taikoToken).snapshot();
+            }
+        }
     }
 
     /// @notice Withdraw token or Ether from this address

packages/protocol/contracts/common/ISnapshot.sol

@@ -0,0 +1,8 @@
+// SPDX-License-Identifier: MIT
+pragma solidity 0.8.24;
+
+/// @title ISnapshot
+/// @custom:security-contact [email protected]
+interface ISnapshot {
+    function snapshot() external returns (uint256);
+}

packages/protocol/contracts/tokenvault/BridgedERC20.sol

@@ -33,8 +33,11 @@ contract BridgedERC20 is
     error BTOKEN_CANNOT_RECEIVE();
     error BTOKEN_UNAUTHORIZED();
 
-    modifier onlyOwnerOrSnapshooter() {
-        if (msg.sender != owner() && msg.sender != snapshooter) {
+    modifier onlyOwnerOrTaikoOrSnapshooter() {
+        if (
+            msg.sender != owner() && msg.sender != snapshooter
+                && msg.sender != resolve(LibStrings.B_TAIKO, false)
+        ) {
             revert BTOKEN_UNAUTHORIZED();
         }
         _;
@@ -81,7 +84,7 @@ contract BridgedERC20 is
     }
 
     /// @notice Creates a new token snapshot.
-    function snapshot() external onlyOwnerOrSnapshooter returns (uint256) {
+    function snapshot() external onlyOwnerOrTaikoOrSnapshooter returns (uint256) {
         return _snapshot();
     }