Add packet_connection attribute to packet lifecycle methods (#8483)

From #8458

Co-authored-by: Ethan Frey <[email protected]>

CHANGELOG.md

@@ -31,6 +31,11 @@ Types of changes (Stanzas):
 "State Machine Breaking" for any changes that result in a different AppState given same genesisState and txList.
 Ref: https://keepachangelog.com/en/1.0.0/
 -->
+# Unreleased
+
+### Improvements
+
+* (x/ibc) [\#8458](https://github.com/cosmos/cosmos-sdk/pull/8458) Add `packet_connection` attribute to ibc events to enable relayer filtering
 
 # Changelog
 

x/ibc/core/04-channel/keeper/packet.go

@@ -129,6 +129,9 @@ func (k Keeper) SendPacket(
 			sdk.NewAttribute(types.AttributeKeyDstPort, packet.GetDestPort()),
 			sdk.NewAttribute(types.AttributeKeyDstChannel, packet.GetDestChannel()),
 			sdk.NewAttribute(types.AttributeKeyChannelOrdering, channel.Ordering.String()),
+			// we only support 1-hop packets now, and that is the most important hop for a relayer
+			// (is it going to a chain I am connected to)
+			sdk.NewAttribute(types.AttributeKeyConnection, channel.ConnectionHops[0]),
 		),
 		sdk.NewEvent(
 			sdk.EventTypeMessage,
@@ -289,6 +292,9 @@ func (k Keeper) RecvPacket(
 			sdk.NewAttribute(types.AttributeKeyDstPort, packet.GetDestPort()),
 			sdk.NewAttribute(types.AttributeKeyDstChannel, packet.GetDestChannel()),
 			sdk.NewAttribute(types.AttributeKeyChannelOrdering, channel.Ordering.String()),
+			// we only support 1-hop packets now, and that is the most important hop for a relayer
+			// (is it going to a chain I am connected to)
+			sdk.NewAttribute(types.AttributeKeyConnection, channel.ConnectionHops[0]),
 		),
 		sdk.NewEvent(
 			sdk.EventTypeMessage,
@@ -370,6 +376,9 @@ func (k Keeper) WriteAcknowledgement(
 			sdk.NewAttribute(types.AttributeKeyDstPort, packet.GetDestPort()),
 			sdk.NewAttribute(types.AttributeKeyDstChannel, packet.GetDestChannel()),
 			sdk.NewAttribute(types.AttributeKeyAck, string(acknowledgement)),
+			// we only support 1-hop packets now, and that is the most important hop for a relayer
+			// (is it going to a chain I am connected to)
+			sdk.NewAttribute(types.AttributeKeyConnection, channel.ConnectionHops[0]),
 		),
 		sdk.NewEvent(
 			sdk.EventTypeMessage,
@@ -505,6 +514,9 @@ func (k Keeper) AcknowledgePacket(
 			sdk.NewAttribute(types.AttributeKeyDstPort, packet.GetDestPort()),
 			sdk.NewAttribute(types.AttributeKeyDstChannel, packet.GetDestChannel()),
 			sdk.NewAttribute(types.AttributeKeyChannelOrdering, channel.Ordering.String()),
+			// we only support 1-hop packets now, and that is the most important hop for a relayer
+			// (is it going to a chain I am connected to)
+			sdk.NewAttribute(types.AttributeKeyConnection, channel.ConnectionHops[0]),
 		),
 		sdk.NewEvent(
 			sdk.EventTypeMessage,

x/ibc/core/04-channel/types/events.go

@@ -30,6 +30,7 @@ const (
 	AttributeKeyDstPort          = "packet_dst_port"
 	AttributeKeyDstChannel       = "packet_dst_channel"
 	AttributeKeyChannelOrdering  = "packet_channel_ordering"
+	AttributeKeyConnection       = "packet_connection"
 )
 
 // IBC channel events vars