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

CHANGELOG.md

@@ -50,6 +50,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 * (modules/core/04-channel) [\#1279](https://github.com/cosmos/ibc-go/pull/1279) Add selected channel version to MsgChanOpenInitResponse and MsgChanOpenTryResponse. Emit channel version during OpenInit/OpenTry
 * (modules/core/keeper) [\#1284](https://github.com/cosmos/ibc-go/pull/1284) Add sanity check for the keepers passed into `ibckeeper.NewKeeper`. `ibckeeper.NewKeeper` now panics if any of the keepers passed in is empty.
 * (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
 

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)
 )