Update pool manager swap amount in parser to take into account cosmwa…

…sm swap executor that has final transfer entry not for sender

cosmos/modules/tx/logic.go

@@ -78,34 +78,52 @@ func ParseTransferEvent(evt LogMessageEvent) ([]TransferEvent, error) {
 		return nil, errInvalidTransfer
 	}
 
-	for i := 0; i < len(evt.Attributes); i++ {
-		attrRecipient := evt.Attributes[i]
-		if attrRecipient.Key == "recipient" {
-			attrSenderIdx := i + 1
-			attrAmountIdx := i + 2
-			if attrAmountIdx < len(evt.Attributes) {
-				attrSender := evt.Attributes[attrSenderIdx]
-				attrAmount := evt.Attributes[attrAmountIdx]
-				if attrSender.Key == "sender" && attrAmount.Key == EventAttributeAmount {
-					transfers = append(transfers, TransferEvent{
-						Recipient: attrRecipient.Value,
-						Sender:    attrSender.Value,
-						Amount:    attrAmount.Value,
-					})
-				} else {
-					return nil, errInvalidTransfer
-				}
-			} else {
-				return nil, errInvalidTransfer
-			}
-		} else if i%3 == 0 { // every third attr should be "recipient"
+	if len(evt.Attributes)%3 != 0 {
+		return nil, errInvalidTransfer
+	}
+
+	// chunk the attributes into groups of 3
+	for i := 0; i < len(evt.Attributes); i += 3 {
+		transferEvent := TransferEvent{}
+		err := parseTransferAttributeIntoEvent(evt.Attributes[i], &transferEvent)
+		if err != nil {
+			return nil, err
+		}
+		err = parseTransferAttributeIntoEvent(evt.Attributes[i+1], &transferEvent)
+		if err != nil {
+			return nil, err
+		}
+		err = parseTransferAttributeIntoEvent(evt.Attributes[i+2], &transferEvent)
+		if err != nil {
+			return nil, err
+		}
+
+		// validate the transfer event
+		if transferEvent.Recipient == "" || transferEvent.Sender == "" || transferEvent.Amount == "" {
 			return nil, errInvalidTransfer
 		}
+
+		transfers = append(transfers, transferEvent)
 	}
 
 	return transfers, nil
 }
 
+func parseTransferAttributeIntoEvent(attr Attribute, evt *TransferEvent) error {
+	switch attr.Key {
+	case "recipient":
+		evt.Recipient = attr.Value
+	case "sender":
+		evt.Sender = attr.Value
+	case "amount":
+		evt.Amount = attr.Value
+	default:
+		return fmt.Errorf("unknown attribute %s", attr.Key)
+	}
+
+	return nil
+}
+
 // If order is reversed, the last attribute containing the given key will be returned
 // otherwise the first attribute will be returned
 func GetValueForAttribute(key string, evt *LogMessageEvent) (string, error) {

osmosis/modules/poolmanager/types.go

@@ -152,42 +152,56 @@ func (sf *WrapperMsgSwapExactAmountIn) HandleMsg(msgType string, msg sdk.Msg, lo
 
 	transferEvents := txModule.GetEventsWithType("transfer", log)
 
-	var transferEvt *txModule.LogMessageEvent
-	if len(transferEvents) == 0 {
-		transferEvt = nil
-	} else {
-		transferEvt = &transferEvents[len(transferEvents)-1]
-	}
-
-	if !parsed && transferEvt != nil {
-		transferEvts, err := txModule.ParseTransferEvent(*transferEvt)
-		if err != nil {
-			return err
-		}
+	if !parsed && len(transferEvents) > 0 {
+
+		var parserError error
+		var lastParsedIndex int
+		// We will attempt to get the last transfer event that executed for the sender
+		// We are scoping it for now so as not to blast all the way to the beginning but to address
+		// poolmanager CosmWasm pool executions that seem to send some small amount to a different address right at the end
+		for i := len(transferEvents) - 1; !parsed && len(transferEvents)-2 >= 0 && i >= len(transferEvents)-2; i-- {
+			lastParsedIndex = i
+			transferEvt := &transferEvents[i]
+
+			transferEvts, err := txModule.ParseTransferEvent(*transferEvt)
+			if err != nil {
+				parserError = err
+				continue
+			}
+
+			// The last transfer event should contain the final transfer to the sender
+			lastTransferEvt := transferEvts[len(transferEvts)-1]
+
+			if lastTransferEvt.Recipient != sf.Address {
+				parserError = errors.New("transfer event recipient does not match message sender")
+				continue
+			}
+
+			tokenOut, err := sdk.ParseCoinNormalized(lastTransferEvt.Amount)
+			if err != nil {
+				parserError = err
+				continue
+			}
+
+			// The last route in the hops gives the token out denom and pool ID for the final output
+			lastRoute := sf.OsmosisMsgSwapExactAmountIn.Routes[len(sf.OsmosisMsgSwapExactAmountIn.Routes)-1]
+			lastRouteDenom := lastRoute.TokenOutDenom
+
+			if tokenOut.Denom != lastRouteDenom {
+				parserError = errors.New("final transfer denom does not match last route denom")
+				continue
+			}
 
-		// The last transfer event should contain the final transfer to the sender
-		lastTransferEvt := transferEvts[len(transferEvts)-1]
-
-		if lastTransferEvt.Recipient != sf.Address {
-			return errors.New("transfer event recipient does not match message sender")
-		}
+			sf.TokenOut = tokenOut
 
-		tokenOut, err := sdk.ParseCoinNormalized(lastTransferEvt.Amount)
-		if err != nil {
-			return err
+			parsed = true
+			parserError = nil
 		}
 
-		// The last route in the hops gives the token out denom and pool ID for the final output
-		lastRoute := sf.OsmosisMsgSwapExactAmountIn.Routes[len(sf.OsmosisMsgSwapExactAmountIn.Routes)-1]
-		lastRouteDenom := lastRoute.TokenOutDenom
-
-		if tokenOut.Denom != lastRouteDenom {
-			return errors.New("final transfer denom does not match last route denom")
+		if parserError != nil {
+			return fmt.Errorf("error parsing transfer event. Last processed index (%d): %s", lastParsedIndex, parserError)
 		}
 
-		sf.TokenOut = tokenOut
-
-		parsed = true
 	}
 
 	if !parsed {