Fix to emit a ChannelUpgradeOpen event if transit to OPEN state in channelUpgradeConfirm

.gas-snapshot

@@ -9,14 +9,14 @@ IBCMockAppTest:testHandshakeBetweenDifferentPorts() (gas: 3339603)
 IBCMockAppTest:testPacketRelay() (gas: 13935831)
 IBCMockAppTest:testPacketTimeout() (gas: 4284259)
 ICS24HostTest:testValidatePortIdentifier() (gas: 37060)
-TestICS02:testCreateClient() (gas: 36639835)
+TestICS02:testCreateClient() (gas: 36638179)
 TestICS02:testHeightToUint128((uint64,uint64)) (runs: 256, μ: 887, ~: 887)
-TestICS02:testInvalidCreateClient() (gas: 36536946)
-TestICS02:testInvalidUpdateClient() (gas: 36535962)
-TestICS02:testRegisterClient() (gas: 36191628)
-TestICS02:testRegisterClientDuplicatedClientType() (gas: 36176937)
-TestICS02:testRegisterClientInvalidClientType() (gas: 36206443)
-TestICS02:testUpdateClient() (gas: 36704162)
+TestICS02:testInvalidCreateClient() (gas: 36535290)
+TestICS02:testInvalidUpdateClient() (gas: 36534306)
+TestICS02:testRegisterClient() (gas: 36189972)
+TestICS02:testRegisterClientDuplicatedClientType() (gas: 36175281)
+TestICS02:testRegisterClientInvalidClientType() (gas: 36204787)
+TestICS02:testUpdateClient() (gas: 36702506)
 TestICS03Handshake:testConnOpenAck() (gas: 1858230)
 TestICS03Handshake:testConnOpenConfirm() (gas: 2054143)
 TestICS03Handshake:testConnOpenInit() (gas: 1429838)
@@ -48,24 +48,24 @@ TestICS04Packet:testRecvPacketTimeoutHeight() (gas: 3259769)
 TestICS04Packet:testRecvPacketTimeoutTimestamp() (gas: 3284145)
 TestICS04Packet:testSendPacket() (gas: 6411842)
 TestICS04Packet:testTimeoutOnClose() (gas: 3553375)
-TestICS04Upgrade:testUpgradeAuthorityCancel() (gas: 46723464)
+TestICS04Upgrade:testUpgradeAuthorityCancel() (gas: 46734825)
 TestICS04Upgrade:testUpgradeCannotCancelWithOldErrorReceipt() (gas: 3458838)
-TestICS04Upgrade:testUpgradeCannotRecvNextUpgradePacket() (gas: 5259191)
-TestICS04Upgrade:testUpgradeCounterpartyAdvanceNextSequenceBeforeOpen() (gas: 5230069)
+TestICS04Upgrade:testUpgradeCannotRecvNextUpgradePacket() (gas: 5258785)
+TestICS04Upgrade:testUpgradeCounterpartyAdvanceNextSequenceBeforeOpen() (gas: 5229663)
 TestICS04Upgrade:testUpgradeCrossingHelloIncompatibleProposals() (gas: 5068281)
-TestICS04Upgrade:testUpgradeFull() (gas: 56559261)
+TestICS04Upgrade:testUpgradeFull() (gas: 56577477)
 TestICS04Upgrade:testUpgradeInit() (gas: 3074224)
 TestICS04Upgrade:testUpgradeNoChanges() (gas: 2473090)
-TestICS04Upgrade:testUpgradeNotUpgradableModule() (gas: 3648638)
+TestICS04Upgrade:testUpgradeNotUpgradableModule() (gas: 3648626)
 TestICS04Upgrade:testUpgradeOutOfSync() (gas: 3905908)
-TestICS04Upgrade:testUpgradeRelaySuccessAtCounterpartyFlushComplete() (gas: 5230956)
-TestICS04Upgrade:testUpgradeRelaySuccessAtFlushing() (gas: 5604165)
-TestICS04Upgrade:testUpgradeSendPacketFailAtFlushingOrFlushComplete() (gas: 4069212)
+TestICS04Upgrade:testUpgradeRelaySuccessAtCounterpartyFlushComplete() (gas: 5230550)
+TestICS04Upgrade:testUpgradeRelaySuccessAtFlushing() (gas: 5603759)
+TestICS04Upgrade:testUpgradeSendPacketFailAtFlushingOrFlushComplete() (gas: 4072103)
 TestICS04Upgrade:testUpgradeTimeoutAbortAck() (gas: 17708385)
 TestICS04Upgrade:testUpgradeTimeoutAbortConfirm() (gas: 21315818)
-TestICS04Upgrade:testUpgradeTimeoutUpgrade() (gas: 70973805)
-TestICS04Upgrade:testUpgradeToOrdered() (gas: 56461648)
-TestICS04Upgrade:testUpgradeToUnordered() (gas: 45074517)
+TestICS04Upgrade:testUpgradeTimeoutUpgrade() (gas: 70972587)
+TestICS04Upgrade:testUpgradeToOrdered() (gas: 56491951)
+TestICS04Upgrade:testUpgradeToUnordered() (gas: 45100181)
 TestICS04UpgradeApp:testUpgradeAuthorizationChanneNotFound() (gas: 61690)
 TestICS04UpgradeApp:testUpgradeAuthorizationRePropose() (gas: 2565379)
 TestICS04UpgradeApp:testUpgradeAuthorizationRemove() (gas: 2475938)

contracts/core/04-channel/IBCChannelUpgrade.sol

@@ -129,6 +129,7 @@ abstract contract IBCChannelUpgradeBase is
      * over to the agreed upon upgrade fields.
      * it will reset the channel state to OPEN.
      * it will delete auxiliary upgrade state.
+     * it will emit a `ChannelUpgradeOpen` event.
      * caller must do all relevant checks before calling this function.
      */
     function openUpgradeHandshake(string calldata portId, string calldata channelId) internal {
@@ -173,6 +174,8 @@ abstract contract IBCChannelUpgradeBase is
 
         updateChannelCommitment(portId, channelId, channel);
         deleteUpgradeCommitment(portId, channelId);
+
+        emit ChannelUpgradeOpen(portId, channelId, channel.upgrade_sequence);
     }
 
     function isCompatibleUpgradeFields(
@@ -699,7 +702,6 @@ contract IBCChannelUpgradeConfirmTimeoutCancel is IBCChannelUpgradeBase, IIBCCha
 
         // move channel to OPEN and adopt upgrade parameters
         openUpgradeHandshake(msg_.portId, msg_.channelId);
-        emit ChannelUpgradeOpen(msg_.portId, msg_.channelId, channel.upgrade_sequence);
 
         // open callback must not return error since counterparty successfully upgraded
         // make application state changes based on new channel parameters

contracts/core/04-channel/IIBCChannelUpgrade.sol

@@ -5,6 +5,50 @@ import {Height} from "../../proto/Client.sol";
 import {Channel, Upgrade, UpgradeFields, ErrorReceipt, Timeout} from "../../proto/Channel.sol";
 
 interface IIBCChannelUpgradeBase {
+    // --------------------- Events --------------------- //
+
+    /// @notice emitted when channelUpgradeInit is successfully executed
+    event ChannelUpgradeInit(
+        string portId, string channelId, uint64 upgradeSequence, UpgradeFields.Data proposedUpgradeFields
+    );
+
+    /// @notice emitted when channelUpgradeTry is successfully executed
+    event ChannelUpgradeTry(
+        string portId,
+        string channelId,
+        uint64 upgradeSequence,
+        UpgradeFields.Data upgradeFields,
+        Timeout.Data timeout,
+        uint64 nextSequenceSend
+    );
+
+    /// @notice emitted when channelUpgradeAck is successfully executed
+    /// @param channelState post channel state (FLUSHING or FLUSHCOMPLETE)
+    event ChannelUpgradeAck(
+        string portId,
+        string channelId,
+        uint64 upgradeSequence,
+        Channel.State channelState,
+        UpgradeFields.Data upgradeFields,
+        Timeout.Data timeout,
+        uint64 nextSequenceSend
+    );
+
+    /// @notice emitted when channelUpgradeConfirm is successfully executed
+    /// @param channelState post channel state (FLUSHING or FLUSHCOMPLETE or OPEN)
+    event ChannelUpgradeConfirm(string portId, string channelId, uint64 upgradeSequence, Channel.State channelState);
+
+    /// @notice emitted when channelUpgradeOpen is successfully executed
+    event ChannelUpgradeOpen(string portId, string channelId, uint64 upgradeSequence);
+
+    /// @notice error when the upgrade attempt fails
+    /// @param portId port identifier
+    /// @param channelId channel identifier
+    /// @param upgradeSequence upgrade sequence
+    event WriteErrorReceipt(string portId, string channelId, uint64 upgradeSequence, string message);
+
+    // --------------------- Structs --------------------- //
+
     enum UpgradeHandshakeError {
         None,
         Overwritten,
@@ -75,44 +119,9 @@ interface IIBCChannelUpgradeBase {
         bytes proofUpgrade;
         Height.Data proofHeight;
     }
-
-    /// @notice error when the upgrade attempt fails
-    /// @param portId port identifier
-    /// @param channelId channel identifier
-    /// @param upgradeSequence upgrade sequence
-    event WriteErrorReceipt(string portId, string channelId, uint64 upgradeSequence, string message);
 }
 
 interface IIBCChannelUpgradeInitTryAck is IIBCChannelUpgradeBase {
-    // --------------------- Events --------------------- //
-
-    /// @notice emitted when channelUpgradeInit is successfully executed
-    event ChannelUpgradeInit(
-        string portId, string channelId, uint64 upgradeSequence, UpgradeFields.Data proposedUpgradeFields
-    );
-
-    /// @notice emitted when channelUpgradeTry is successfully executed
-    event ChannelUpgradeTry(
-        string portId,
-        string channelId,
-        uint64 upgradeSequence,
-        UpgradeFields.Data upgradeFields,
-        Timeout.Data timeout,
-        uint64 nextSequenceSend
-    );
-
-    /// @notice emitted when channelUpgradeAck is successfully executed
-    /// @param channelState post channel state (FLUSHING or FLUSHCOMPLETE)
-    event ChannelUpgradeAck(
-        string portId,
-        string channelId,
-        uint64 upgradeSequence,
-        Channel.State channelState,
-        UpgradeFields.Data upgradeFields,
-        Timeout.Data timeout,
-        uint64 nextSequenceSend
-    );
-
     // --------------------- External Functions --------------------- //
 
     /**
@@ -147,15 +156,6 @@ interface IIBCChannelUpgradeInitTryAck is IIBCChannelUpgradeBase {
 }
 
 interface IIBCChannelUpgradeConfirmOpenTimeoutCancel is IIBCChannelUpgradeBase {
-    // --------------------- Events --------------------- //
-
-    /// @notice emitted when channelUpgradeConfirm is successfully executed
-    /// @param channelState post channel state (FLUSHING or FLUSHCOMPLETE or OPEN)
-    event ChannelUpgradeConfirm(string portId, string channelId, uint64 upgradeSequence, Channel.State channelState);
-
-    /// @notice emitted when channelUpgradeOpen is successfully executed
-    event ChannelUpgradeOpen(string portId, string channelId, uint64 upgradeSequence);
-
     // --------------------- External Functions --------------------- //
 
     /**