use bitmap

ethstorage · Sep 30, 2024 · 4a3d006 · 4a3d006
1 parent 44da2b7
commit 4a3d006
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Showing 3 changed files with 35 additions and 14 deletions.
diff --git a/contracts/EthStorageContractL2.sol b/contracts/EthStorageContractL2.sol
@@ -28,10 +28,9 @@ contract EthStorageContractL2 is EthStorageContract2 {
     IL1Block internal constant L1_BLOCK = IL1Block(0x4200000000000000000000000000000000000015);
     /// @notice The rate limit to update blobs per block
     uint256 internal immutable UPDATE_LIMIT;
-    /// @notice The blobs updated within current block
-    uint256 internal blobsUpdated;
-    /// @notice The block last update happens
-    uint256 internal blockLastUpdate;
+
+    /// @notice Bitmap to store blobsUpdated and blockLastUpdate
+    uint256 internal updateStateBitmap;
 
     /// @notice Constructs the EthStorageContractL2 contract.
     constructor(
@@ -68,13 +67,17 @@ contract EthStorageContractL2 is EthStorageContract2 {
 
     /// @notice Check the update rate limit of blobs put.
     function _checkUpdateLimit(uint256 _blobs) internal override {
-        if (blockLastUpdate == _blockNumber()) {
-            blobsUpdated = blobsUpdated + _blobs;
+        uint256 currentBlock = _blockNumber();
+        uint256 blockLastUpdate = updateStateBitmap & type(uint128).max;
+        if (blockLastUpdate == currentBlock) {
+            uint256 blobsUpdated = updateStateBitmap >> 128;
+            blobsUpdated += _blobs;
+            require(blobsUpdated <= UPDATE_LIMIT, "EthStorageContractL2: exceeds update rate limit");
+            updateStateBitmap = (blobsUpdated << 128) | currentBlock;
         } else {
-            blockLastUpdate = _blockNumber();
-            blobsUpdated = _blobs;
+            require(_blobs <= UPDATE_LIMIT, "EthStorageContractL2: exceeds update rate limit");
+            updateStateBitmap = (_blobs << 128) | currentBlock;
         }
-        require(blobsUpdated <= UPDATE_LIMIT, "EthStorageContractL2: exceeds update rate limit");
     }
 
     /// @notice Getter for UPDATE_LIMIT

diff --git a/contracts/test/EthStorageContractL2Test.t.sol b/contracts/test/EthStorageContractL2Test.t.sol
@@ -10,7 +10,7 @@ contract EthStorageContractL2Test is Test {
     uint256 constant SHARD_SIZE_BITS = 19;
     uint256 constant MAX_KV_SIZE = 17;
     uint256 constant PREPAID_AMOUNT = 0;
-    uint256 constant UPDATE_LIMIT = 12;
+    uint256 constant UPDATE_LIMIT = 16;
 
     TestEthStorageContractL2 storageContract;
     address owner = address(0x1);
@@ -27,7 +27,7 @@ contract EthStorageContractL2Test is Test {
         storageContract = TestEthStorageContractL2(address(proxy));
     }
 
-    function testCheckUpdateLimitWithinSameBlock() public {
+    function testUpdateLimit() public {
         uint256 size = 6;
         bytes32[] memory hashes = new bytes32[](size);
         bytes32[] memory keys = new bytes32[](size);
@@ -52,12 +52,28 @@ contract EthStorageContractL2Test is Test {
         storageContract.putBlobs(keys, blobIdxs, lengths);
         assertEq(storageContract.getBlobsUpdated(), 5);
         assertEq(storageContract.getBlockLastUpdate(), 10000);
+
         // Update all 6
         storageContract.putBlobs(keys, blobIdxs, lengths);
         assertEq(storageContract.getBlobsUpdated(), 11);
-        // Update all 6 again, exceeds 12
+
+        // Update all 6 again, exceeds UPDATE_LIMIT = 16
         vm.expectRevert("EthStorageContractL2: exceeds update rate limit");
         storageContract.putBlobs(keys, blobIdxs, lengths);
         assertEq(storageContract.getBlockLastUpdate(), 10000);
+
+        vm.roll(block.number + 1);
+
+        // Update all 6
+        storageContract.putBlobs(keys, blobIdxs, lengths);
+        assertEq(storageContract.getBlobsUpdated(), 6);
+        assertEq(storageContract.getBlockLastUpdate(), 10001);
+
+        // Update till exceeds UPDATE_LIMIT = 16
+        storageContract.putBlobs(keys, blobIdxs, lengths);
+        assertEq(storageContract.getBlobsUpdated(), 12);
+        assertEq(storageContract.getBlockLastUpdate(), 10001);
+        vm.expectRevert("EthStorageContractL2: exceeds update rate limit");
+        storageContract.putBlobs(keys, blobIdxs, lengths);
     }
 }
diff --git a/contracts/test/TestEthStorageContractL2.sol b/contracts/test/TestEthStorageContractL2.sol
@@ -12,12 +12,14 @@ contract TestEthStorageContractL2 is EthStorageContractL2 {
         uint256 _updateLimit
     ) EthStorageContractL2(_config, _startTime, _storageCost, _dcfFactor, _updateLimit) {}
 
+    /// @notice Get the number of blobs updated within the current block.
     function getBlobsUpdated() public view returns (uint256) {
-        return blobsUpdated;
+        return updateStateBitmap >> 128;
     }
 
+    /// @notice Get the block number of the last update.
     function getBlockLastUpdate() public view returns (uint256) {
-        return blockLastUpdate;
+        return updateStateBitmap & type(uint128).max;
     }
 
     function _blockNumber() internal view virtual override returns (uint256) {