chore: fee payer event (#12850)

* updates

* updates

* updates

Author: alexanderbez

types/events.go

@@ -217,6 +217,7 @@ const (
 	AttributeKeyAccountSequence = "acc_seq"
 	AttributeKeySignature       = "signature"
 	AttributeKeyFee             = "fee"
+	AttributeKeyFeePayer        = "fee_payer"
 
 	EventTypeMessage = "message"
 

x/auth/ante/fee.go

@@ -109,9 +109,10 @@ func (dfd DeductFeeDecorator) checkDeductFee(ctx sdk.Context, sdkTx sdk.Tx, fee
 		}
 	}
 
-	events := sdk.Events{sdk.NewEvent(sdk.EventTypeTx,
-		sdk.NewAttribute(sdk.AttributeKeyFee, fee.String()),
-	)}
+	events := sdk.Events{
+		sdk.NewEvent(sdk.EventTypeTx, sdk.NewAttribute(sdk.AttributeKeyFee, fee.String())),
+		sdk.NewEvent(sdk.EventTypeTx, sdk.NewAttribute(sdk.AttributeKeyFeePayer, deductFeesFrom.String())),
+	}
 	ctx.EventManager().EmitEvents(events)
 
 	return nil

x/auth/tx/service_test.go

@@ -225,7 +225,7 @@ func (s IntegrationTestSuite) TestSimulateTx_GRPC() {
 				// - tx.* events: tx.fee, tx.acc_seq, tx.signature
 				// - Sending Amount to recipient: coin_spent, coin_received, transfer and message.sender=<val1>
 				// - Msg events: message.module=bank and message.action=/cosmos.bank.v1beta1.MsgSend
-				s.Require().Equal(len(res.GetResult().GetEvents()), 13) // 1 coin recv 1 coin spent, 1 transfer, 3 messages.
+				s.Require().Equal(len(res.GetResult().GetEvents()), 14) // 1 coin recv 1 coin spent, 1 transfer, 3 messages.
 				s.Require().True(res.GetGasInfo().GetGasUsed() > 0)     // Gas used sometimes change, just check it's not empty.
 			}
 		})
@@ -267,7 +267,7 @@ func (s IntegrationTestSuite) TestSimulateTx_GRPCGateway() {
 				s.Require().NoError(err)
 				// Check the result and gas used are correct.
 				s.Require().Len(result.GetResult().MsgResponses, 1)
-				s.Require().Equal(len(result.GetResult().GetEvents()), 13) // See TestSimulateTx_GRPC for the 13 events.
+				s.Require().Equal(len(result.GetResult().GetEvents()), 14) // See TestSimulateTx_GRPC for the 13 events.
 				s.Require().True(result.GetGasInfo().GetGasUsed() > 0)     // Gas used sometimes change, jus
 			}
 		})