ics29:feat: emit event escrow (#914)

* feat: emit EventTypeSendIncentivizedPacket event on EscrowPacket

* fix: string conversion

* refactor: add helper fn for emit event

* chore: godoc

* nit: use .String())

modules/apps/29-fee/keeper/escrow.go

@@ -39,6 +39,8 @@ func (k Keeper) EscrowPacketFee(ctx sdk.Context, identifiedFee types.IdentifiedP
 	identifiedFees := types.NewIdentifiedPacketFees(packetFees)
 	k.SetFeesInEscrow(ctx, identifiedFee.PacketId, identifiedFees)
 
+	EmitIncentivizedPacket(ctx, identifiedFee)
+
 	return nil
 }
 

modules/apps/29-fee/keeper/events.go

@@ -0,0 +1,25 @@
+package keeper
+
+import (
+	"fmt"
+
+	sdk "github.com/cosmos/cosmos-sdk/types"
+
+	"github.com/cosmos/ibc-go/v3/modules/apps/29-fee/types"
+	channeltypes "github.com/cosmos/ibc-go/v3/modules/core/04-channel/types"
+)
+
+// EmitIncentivizedPacket emits an event so that relayers know an incentivized packet is ready to be relayed
+func EmitIncentivizedPacket(ctx sdk.Context, identifiedFee types.IdentifiedPacketFee) {
+	ctx.EventManager().EmitEvent(
+		sdk.NewEvent(
+			types.EventTypeIncentivizedPacket,
+			sdk.NewAttribute(channeltypes.AttributeKeyPortID, identifiedFee.PacketId.PortId),
+			sdk.NewAttribute(channeltypes.AttributeKeyChannelID, identifiedFee.PacketId.ChannelId),
+			sdk.NewAttribute(channeltypes.AttributeKeySequence, fmt.Sprint(identifiedFee.PacketId.Sequence)),
+			sdk.NewAttribute(types.AttributeKeyRecvFee, identifiedFee.Fee.RecvFee.String()),
+			sdk.NewAttribute(types.AttributeKeyAckFee, identifiedFee.Fee.AckFee.String()),
+			sdk.NewAttribute(types.AttributeKeyTimeoutFee, identifiedFee.Fee.TimeoutFee.String()),
+		),
+	)
+}

modules/apps/29-fee/types/events.go

@@ -1,4 +1,6 @@
 package types
 
 // 29-fee events
-const ()
+const (
+	EventTypeIncentivizedPacket = "incentivized_ibc_packet"
+)

modules/apps/29-fee/types/keys.go

@@ -35,6 +35,10 @@ const (
 
 	// ForwardRelayerPrefix is the key prefix for forward relayer addresses stored in state for async acknowledgements
 	ForwardRelayerPrefix = "forwardRelayer"
+
+	AttributeKeyRecvFee    = "recv_fee"
+	AttributeKeyAckFee     = "ack_fee"
+	AttributeKeyTimeoutFee = "timeout_fee"
 )
 
 // FeeEnabledKey returns the key that stores a flag to determine if fee logic should