Emit channel close event on ordered channel close (#1464)

Author: chatton

CHANGELOG.md

@@ -60,6 +60,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 * (app/29-fee) [\#1305](https://github.com/cosmos/ibc-go/pull/1305) Change version string for fee module to `ics29-1`
 * (app/29-fee) [\#1341](https://github.com/cosmos/ibc-go/pull/1341) Check if the fee module is locked and if the fee module is enabled before refunding all fees
 * (transfer) [\#1414](https://github.com/cosmos/ibc-go/pull/1414) Emitting Sender address from `fungible_token_packet` events in `OnRecvPacket` and `OnAcknowledgementPacket`.
+* (modules/core/04-channel) [\#1464](https://github.com/cosmos/ibc-go/pull/1464) Emit a channel close event when an ordered channel is closed.
 
 ### Features
 
@@ -68,7 +69,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 * (apps/29-fee) [\#1224](https://github.com/cosmos/ibc-go/pull/1224) Adding Query/CounterpartyAddress and CLI to ICS29 fee middleware
 * (apps/29-fee) [\#1225](https://github.com/cosmos/ibc-go/pull/1225) Adding Query/FeeEnabledChannel and Query/FeeEnabledChannels with CLIs to ICS29 fee middleware.
 * (modules/apps/29-fee) [\#1230](https://github.com/cosmos/ibc-go/pull/1230) Adding CLI command for getting incentivized packets for a specific channel-id. 
-* (modules/apps/transfer) [\#1416](https://github.com/cosmos/ibc-go/pull/1416) Adding gRPC endpoint for getting an escrow account for a given port-id and channel-id.
+* (modules/apps/transfer) [\#1416](https://github.com/cosmos/ibc-go/pull/1416) Adding gRPC endpoint for getting an escrow account for a given port-id and channel-id. 
 
 ### Bug Fixes
 

modules/core/04-channel/keeper/events.go

@@ -252,3 +252,18 @@ func EmitTimeoutPacketEvent(ctx sdk.Context, packet exported.PacketI, channel ty
 		),
 	})
 }
+
+// EmitChannelClosedEvent emits a channel closed event.
+func EmitChannelClosedEvent(ctx sdk.Context, packet exported.PacketI, channel types.Channel) {
+	ctx.EventManager().EmitEvents(sdk.Events{
+		sdk.NewEvent(
+			types.EventTypeChannelClosed,
+			sdk.NewAttribute(types.AttributeKeyPortID, packet.GetSourcePort()),
+			sdk.NewAttribute(types.AttributeKeyChannelID, packet.GetSourceChannel()),
+			sdk.NewAttribute(types.AttributeCounterpartyPortID, channel.Counterparty.PortId),
+			sdk.NewAttribute(types.AttributeCounterpartyChannelID, channel.Counterparty.ChannelId),
+			sdk.NewAttribute(types.AttributeKeyConnectionID, channel.ConnectionHops[0]),
+			sdk.NewAttribute(types.AttributeKeyChannelOrdering, channel.Ordering.String()),
+		),
+	})
+}

modules/core/04-channel/keeper/timeout.go

@@ -170,6 +170,10 @@ func (k Keeper) TimeoutExecuted(
 	// emit an event marking that we have processed the timeout
 	EmitTimeoutPacketEvent(ctx, packet, channel)
 
+	if channel.Ordering == types.ORDERED && channel.State == types.CLOSED {
+		EmitChannelClosedEvent(ctx, packet, channel)
+	}
+
 	return nil
 }
 

modules/core/04-channel/types/events.go

@@ -48,6 +48,7 @@ var (
 	EventTypeChannelOpenConfirm  = "channel_open_confirm"
 	EventTypeChannelCloseInit    = "channel_close_init"
 	EventTypeChannelCloseConfirm = "channel_close_confirm"
+	EventTypeChannelClosed       = "channel_close"
 
 	AttributeValueCategory = fmt.Sprintf("%s_%s", host.ModuleName, SubModuleName)
 )