feat(protocol): add overridable getEIP1559Config() to TaikoL2 (#13815)

taikoxyz · May 25, 2023 · bacd9b4 · bacd9b4
1 parent d48117e
commit bacd9b4
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Showing 4 changed files with 56 additions and 49 deletions.
diff --git a/packages/protocol/contracts/L2/TaikoL2.sol b/packages/protocol/contracts/L2/TaikoL2.sol
@@ -34,6 +34,12 @@ contract TaikoL2 is EssentialContract, TaikoL2Signer, ICrossChainSync {
         uint64 ratio2x1x;
     }
 
+    struct EIP1559Config {
+        uint128 yscale;
+        uint64 xscale;
+        uint64 gasIssuedPerSecond;
+    }
+
     /*//////////////////////////////////////////////////////////////
                             STATE VARIABLES
     //////////////////////////////////////////////////////////////*/
@@ -47,14 +53,12 @@ contract TaikoL2 is EssentialContract, TaikoL2Signer, ICrossChainSync {
     // A hash to check the integrity of public inputs.
     bytes32 public publicInputHash;
 
-    uint128 public yscale;
-    uint64 public xscale;
-    uint64 public gasIssuedPerSecond;
+    EIP1559Config private _eip1559Config;
 
     uint64 public parentTimestamp;
     uint64 public latestSyncedL1Height;
     uint64 public gasExcess;
-    uint64 public __reserved1;
+    uint64 private __reserved1;
 
     uint256[45] private __gap;
 
@@ -108,21 +112,20 @@ contract TaikoL2 is EssentialContract, TaikoL2Signer, ICrossChainSync {
                     || _param1559.ratio2x1x == 0
             ) revert L2_INVALID_1559_PARAMS();
 
-            uint128 _xscale;
-            (_xscale, yscale) = Lib1559Math.calculateScales({
+            (uint128 xscale, uint128 yscale) = Lib1559Math.calculateScales({
                 xExcessMax: _param1559.gasExcessMax,
                 price: _param1559.basefee,
                 target: _param1559.gasTarget,
                 ratio2x1x: _param1559.ratio2x1x
             });
 
-            if (_xscale == 0 || _xscale >= type(uint64).max || yscale == 0) {
+            if (xscale == 0 || xscale >= type(uint64).max || yscale == 0) {
                 revert L2_INVALID_1559_PARAMS();
             }
-            xscale = uint64(_xscale);
+            _eip1559Config.yscale = yscale;
+            _eip1559Config.xscale = uint64(xscale);
+            _eip1559Config.gasIssuedPerSecond = _param1559.gasIssuedPerSecond;
 
-            // basefee = _param1559.basefee;
-            gasIssuedPerSecond = _param1559.gasIssuedPerSecond;
             gasExcess = _param1559.gasExcessMax / 2;
         }
 
@@ -181,9 +184,10 @@ contract TaikoL2 is EssentialContract, TaikoL2Signer, ICrossChainSync {
 
         // Check EIP-1559 basefee
         uint256 basefee;
-        if (gasIssuedPerSecond != 0) {
+        EIP1559Config memory config = getEIP1559Config();
+        if (config.gasIssuedPerSecond != 0) {
             (basefee, gasExcess) = _calcBasefee(
-                block.timestamp - parentTimestamp, uint64(block.gaslimit), parentGasUsed
+                config, block.timestamp - parentTimestamp, uint64(block.gaslimit), parentGasUsed
             );
         }
 
@@ -216,7 +220,7 @@ contract TaikoL2 is EssentialContract, TaikoL2Signer, ICrossChainSync {
         view
         returns (uint256 _basefee)
     {
-        (_basefee,) = _calcBasefee(timeSinceParent, gasLimit, parentGasUsed);
+        (_basefee,) = _calcBasefee(getEIP1559Config(), timeSinceParent, gasLimit, parentGasUsed);
     }
 
     function getCrossChainBlockHash(uint256 number) public view override returns (bytes32) {
@@ -239,6 +243,12 @@ contract TaikoL2 is EssentialContract, TaikoL2Signer, ICrossChainSync {
         }
     }
 
+    /// @dev Overide this funciton to return a constant EIP1559Config object
+    // to avoid reading from storage to reduce gas cost.
+    function getEIP1559Config() public view virtual returns (EIP1559Config memory) {
+        return _eip1559Config;
+    }
+
     /*//////////////////////////////////////////////////////////////
                            PRIVATE FUNCTIONS
     //////////////////////////////////////////////////////////////*/
@@ -270,25 +280,26 @@ contract TaikoL2 is EssentialContract, TaikoL2Signer, ICrossChainSync {
         }
     }
 
-    function _calcBasefee(uint256 timeSinceParent, uint64 gasLimit, uint64 parentGasUsed)
-        private
-        view
-        returns (uint256 _basefee, uint64 _gasExcess)
-    {
+    function _calcBasefee(
+        EIP1559Config memory config,
+        uint256 timeSinceParent,
+        uint64 gasLimit,
+        uint64 parentGasUsed
+    ) private view returns (uint256 _basefee, uint64 _gasExcess) {
         // Very important to cap _gasExcess uint64
         unchecked {
             uint64 parentGasUsedNet = parentGasUsed > LibL2Consts.ANCHOR_GAS_COST
                 ? parentGasUsed - LibL2Consts.ANCHOR_GAS_COST
                 : 0;
 
             uint256 a = uint256(gasExcess) + parentGasUsedNet;
-            uint256 b = gasIssuedPerSecond * timeSinceParent;
+            uint256 b = config.gasIssuedPerSecond * timeSinceParent;
             _gasExcess = uint64((a.max(b) - b).min(type(uint64).max));
         }
 
         _basefee = Lib1559Math.calculatePrice({
-            xscale: xscale,
-            yscale: yscale,
+            xscale: config.xscale,
+            yscale: config.yscale,
             xExcess: _gasExcess,
             xPurchase: gasLimit
         });

diff --git a/packages/protocol/test/TaikoL2.t.sol b/packages/protocol/test/TaikoL2.t.sol
@@ -151,7 +151,7 @@ contract TestTaikoL2 is Test {
         private
         returns (uint256 _basefee)
     {
-        uint256 gasIssued = L2.gasIssuedPerSecond() * timeSinceParent;
+        uint256 gasIssued = L2.getEIP1559Config().gasIssuedPerSecond * timeSinceParent;
         string memory _msg = string.concat(
             "#",
             Strings.toString(logIndex++),

diff --git a/packages/protocol/utils/generate_genesis/taikoL2.ts b/packages/protocol/utils/generate_genesis/taikoL2.ts
@@ -334,11 +334,13 @@ async function generateContractConfigs(
                             ]),
                     ]
                 )}`,
-                yscale: ethers.BigNumber.from(param1559.yscale),
-                xscale: ethers.BigNumber.from(param1559.xscale),
-                gasIssuedPerSecond: ethers.BigNumber.from(
-                    param1559.gasIssuedPerSecond
-                ),
+                _eip1559Config: {
+                    yscale: ethers.BigNumber.from(param1559.yscale),
+                    xscale: ethers.BigNumber.from(param1559.xscale),
+                    gasIssuedPerSecond: ethers.BigNumber.from(
+                        param1559.gasIssuedPerSecond
+                    )
+                },
                 parentTimestamp: Math.floor(new Date().getTime() / 1000),
                 gasExcess: ethers.BigNumber.from(param1559.gasExcess),
                 // AddressResolver

diff --git a/packages/website/pages/docs/reference/contract-documentation/L2/TaikoL2.md b/packages/website/pages/docs/reference/contract-documentation/L2/TaikoL2.md
@@ -25,28 +25,20 @@ struct EIP1559Params {
 }
 ```
 
-### publicInputHash
-
-```solidity
-bytes32 publicInputHash
-```
-
-### yscale
+### EIP1559Config
 
 ```solidity
-uint128 yscale
-```
-
-### xscale
-
-```solidity
-uint64 xscale
+struct EIP1559Config {
+  uint128 yscale;
+  uint64 xscale;
+  uint64 gasIssuedPerSecond;
+}
 ```
 
-### gasIssuedPerSecond
+### publicInputHash
 
 ```solidity
-uint64 gasIssuedPerSecond
+bytes32 publicInputHash
 ```
 
 ### parentTimestamp
@@ -67,12 +59,6 @@ uint64 latestSyncedL1Height
 uint64 gasExcess
 ```
 
-### \_\_reserved1
-
-```solidity
-uint64 __reserved1
-```
-
 ### Anchored
 
 ```solidity
@@ -214,6 +200,14 @@ block number.
 function getBlockHash(uint256 number) public view returns (bytes32)
 ```
 
+### getEIP1559Config
+
+```solidity
+function getEIP1559Config() public view virtual returns (struct TaikoL2.EIP1559Config)
+```
+
+_Overide this funciton to return a constant EIP1559Config object_
+
 ---
 
 ## title: ProxiedTaikoL2