fix(og): L-02 - Emit event on syncing upgraded OOv3

packages/core/contracts/optimistic-governor/implementation/OptimisticGovernor.sol

@@ -61,6 +61,8 @@ contract OptimisticGovernor is OptimisticOracleV3CallbackRecipientInterface, Mod
 
     event SetEscalationManager(address indexed escalationManager);
 
+    event OptimisticOracleChanged(address indexed newOptimisticOracleV3);
+
     FinderInterface public immutable finder; // Finder used to discover other UMA ecosystem contracts.
 
     IERC20 public collateral; // Collateral currency used to assert proposed transactions.
@@ -418,9 +420,11 @@ contract OptimisticGovernor is OptimisticOracleV3CallbackRecipientInterface, Mod
 
     // Caches the address of the Optimistic Oracle V3 from the Finder.
     function _sync() internal {
-        optimisticOracleV3 = OptimisticOracleV3Interface(
-            finder.getImplementationAddress(OracleInterfaces.OptimisticOracleV3)
-        );
+        address newOptimisticOracleV3 = finder.getImplementationAddress(OracleInterfaces.OptimisticOracleV3);
+        if (newOptimisticOracleV3 != address(optimisticOracleV3)) {
+            optimisticOracleV3 = OptimisticOracleV3Interface(newOptimisticOracleV3);
+            emit OptimisticOracleChanged(newOptimisticOracleV3);
+        }
     }
 
     // Checks if the address is a contract.

packages/core/test/hardhat/optimistic-governor/OptimisticGovernor.js

@@ -1224,6 +1224,28 @@ describe("OptimisticGovernor", () => {
     );
   });
 
+  it("Can reset Escalation Manager to zero address", async function () {
+    // Deploy Full Policy Escalation Manager and set it as new Escalation Manager.
+    const newEscalationManager = await FullPolicyEscalationManager.new(optimisticOracleV3.options.address).send({
+      from: owner,
+    });
+    const setEscalationManagerData = optimisticOracleModule.methods
+      .setEscalationManager(newEscalationManager.options.address)
+      .encodeABI();
+    await avatar.methods
+      .exec(optimisticOracleModule.options.address, "0", setEscalationManagerData)
+      .send({ from: owner });
+
+    // Reset Escalation Manager to zero address.
+    const resetEscalationManagerData = optimisticOracleModule.methods.setEscalationManager(ZERO_ADDRESS).encodeABI();
+    await avatar.methods
+      .exec(optimisticOracleModule.options.address, "0", resetEscalationManagerData)
+      .send({ from: owner });
+
+    // Check that Escalation Manager is set to zero address.
+    assert.equal(await optimisticOracleModule.methods.escalationManager().call(), ZERO_ADDRESS);
+  });
+
   it("Cannot process callback from Optimistic Oracle V3 with invalid assertionId", async function () {
     // Create assertion directly with Optimistic Oracle V3 and pointing Optimistic Governor as the callback recipient.
     await bondToken.methods.approve(optimisticOracleV3.options.address, bond).send({ from: proposer });
@@ -1267,25 +1289,37 @@ describe("OptimisticGovernor", () => {
     );
   });
 
-  it("Can reset Escalation Manager to zero address", async function () {
-    // Deploy Full Policy Escalation Manager and set it as new Escalation Manager.
-    const newEscalationManager = await FullPolicyEscalationManager.new(optimisticOracleV3.options.address).send({
-      from: owner,
-    });
-    const setEscalationManagerData = optimisticOracleModule.methods
-      .setEscalationManager(newEscalationManager.options.address)
-      .encodeABI();
-    await avatar.methods
-      .exec(optimisticOracleModule.options.address, "0", setEscalationManagerData)
+  it("Emits event on syncing new Optimistic Oracle V3", async function () {
+    // Upgrade the Optimistic Oracle V3.
+    const defaultCurrency = await TestnetERC20.new("Default Currency", "DC", 18).send({ from: owner });
+    const newOptimisticOracleV3 = await OptimisticOracleV3Test.new(
+      finder.options.address,
+      defaultCurrency.options.address,
+      liveness,
+      timer.options.address
+    ).send({ from: owner });
+    await finder.methods
+      .changeImplementationAddress(utf8ToHex(interfaceName.OptimisticOracleV3), newOptimisticOracleV3.options.address)
       .send({ from: owner });
 
-    // Reset Escalation Manager to zero address.
-    const resetEscalationManagerData = optimisticOracleModule.methods.setEscalationManager(ZERO_ADDRESS).encodeABI();
-    await avatar.methods
-      .exec(optimisticOracleModule.options.address, "0", resetEscalationManagerData)
+    // Cache the upgraded Optimistic Oracle V3 and check the event is emitted.
+    const receipt = await optimisticOracleModule.methods.sync().send({ from: disputer });
+    await assertEventEmitted(
+      receipt,
+      optimisticOracleModule,
+      "OptimisticOracleChanged",
+      (event) => event.newOptimisticOracleV3 == newOptimisticOracleV3.options.address
+    );
+
+    // Revert to the original Optimistic Oracle V3 for other tests.
+    await finder.methods
+      .changeImplementationAddress(utf8ToHex(interfaceName.OptimisticOracleV3), optimisticOracleV3.options.address)
       .send({ from: owner });
+  });
 
-    // Check that Escalation Manager is set to zero address.
-    assert.equal(await optimisticOracleModule.methods.escalationManager().call(), ZERO_ADDRESS);
+  it("Does not emit event on syncing the same Optimistic Oracle V3", async function () {
+    // Sync the Optimistic Oracle V3 and check the event is not emitted.
+    const receipt = await optimisticOracleModule.methods.sync().send({ from: owner });
+    assert.equal(Object.keys(receipt.events).length, 0);
   });
 });