core/txpool: improve error responses with wrapped errors (#30715)

core/txpool/txpool.go

@@ -358,7 +358,7 @@ func (p *TxPool) Add(txs []*types.Transaction, local bool, sync bool) []error {
 	for i, split := range splits {
 		// If the transaction was rejected by all subpools, mark it unsupported
 		if split == -1 {
-			errs[i] = core.ErrTxTypeNotSupported
+			errs[i] = fmt.Errorf("%w: received type %d", core.ErrTxTypeNotSupported, txs[i].Type())
 			continue
 		}
 		// Find which subpool handled it and pull in the corresponding error

core/txpool/validation.go

@@ -99,7 +99,7 @@ func ValidateTransaction(tx *types.Transaction, head *types.Header, signer types
 	}
 	// Make sure the transaction is signed properly
 	if _, err := types.Sender(signer, tx); err != nil {
-		return ErrInvalidSender
+		return fmt.Errorf("%w: %v", ErrInvalidSender, err)
 	}
 	// Ensure the transaction has more gas than the bare minimum needed to cover
 	// the transaction metadata