feat: Add extension event to `OptimismPortal2` (#10350)

* feat: Add extension event to `OptimismPortal2`

Adds an extension event to the `OptimismPortal2` that allows for easier
indexing of proven withdrawals by off-chain monitoring services.
Previously, in order to look up a proof for a withdrawal when syncing an
indexer, archival state access was required.

* semver lock

packages/contracts-bedrock/semver-lock.json

@@ -36,8 +36,8 @@
     "sourceCodeHash": "0xd3450653cecc14bf8fbc21f2fa9b4a5fde348c2b6313d72e74e08666201295a2"
   },
   "src/L1/OptimismPortal2.sol": {
-    "initCodeHash": "0x34432a932e5deaebb856320d6e5d243a3db5d9a8e5e572915346875923ba70be",
-    "sourceCodeHash": "0xe90774d3f89f937c56439fb7d567106bef0be0fc298fe07bbbc74f2b08445aa5"
+    "initCodeHash": "0xea32d79e8297956d4f9a4c7985bb53ff8bb3735e5b307d4e118fea71f503a38e",
+    "sourceCodeHash": "0x2b662e100d1e282588eaaf3704aca0d0a6900ec3b8f8134e2d5d577ee372e42f"
   },
   "src/L1/ProtocolVersions.sol": {
     "initCodeHash": "0x72cd467e8bcf019c02675d72ab762e088bcc9cc0f1a4e9f587fa4589f7fdd1b8",

packages/contracts-bedrock/snapshots/abi/OptimismPortal2.json

@@ -691,6 +691,25 @@
     "name": "WithdrawalProven",
     "type": "event"
   },
+  {
+    "anonymous": false,
+    "inputs": [
+      {
+        "indexed": true,
+        "internalType": "bytes32",
+        "name": "withdrawalHash",
+        "type": "bytes32"
+      },
+      {
+        "indexed": true,
+        "internalType": "address",
+        "name": "proofSubmitter",
+        "type": "address"
+      }
+    ],
+    "name": "WithdrawalProvenExtension1",
+    "type": "event"
+  },
   {
     "inputs": [],
     "name": "BadTarget",

packages/contracts-bedrock/src/L1/OptimismPortal2.sol

@@ -113,6 +113,12 @@ contract OptimismPortal2 is Initializable, ResourceMetering, ISemver {
     /// @param to             Address that the withdrawal transaction is directed to.
     event WithdrawalProven(bytes32 indexed withdrawalHash, address indexed from, address indexed to);
 
+    /// @notice Emitted when a withdrawal transaction is proven. Exists as a separate event to allow for backwards
+    ///         compatibility for tooling that observes the `WithdrawalProven` event.
+    /// @param withdrawalHash Hash of the withdrawal transaction.
+    /// @param proofSubmitter Address of the proof submitter.
+    event WithdrawalProvenExtension1(bytes32 indexed withdrawalHash, address indexed proofSubmitter);
+
     /// @notice Emitted when a withdrawal transaction is finalized.
     /// @param withdrawalHash Hash of the withdrawal transaction.
     /// @param success        Whether the withdrawal transaction was successful.
@@ -305,6 +311,8 @@ contract OptimismPortal2 is Initializable, ResourceMetering, ISemver {
 
         // Emit a `WithdrawalProven` event.
         emit WithdrawalProven(withdrawalHash, _tx.sender, _tx.target);
+        // Emit a `WithdrawalProvenExtension1` event.
+        emit WithdrawalProvenExtension1(withdrawalHash, msg.sender);
 
         // Add the proof submitter to the list of proof submitters for this withdrawal hash.
         proofSubmitters[withdrawalHash].push(msg.sender);

packages/contracts-bedrock/test/setup/Events.sol

@@ -14,6 +14,7 @@ contract Events {
 
     event WithdrawalFinalized(bytes32 indexed withdrawalHash, bool success);
     event WithdrawalProven(bytes32 indexed withdrawalHash, address indexed from, address indexed to);
+    event WithdrawalProvenExtension1(bytes32 indexed withdrawalHash, address indexed proofSubmitter);
 
     event SentMessage(address indexed target, address sender, bytes message, uint256 messageNonce, uint256 gasLimit);
     event SentMessageExtension1(address indexed sender, uint256 value);