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* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
package thrift
import (
// Generic Thrift exception
type TException interface {
TExceptionType() TExceptionType
// Prepends additional information to an error without losing the Thrift exception interface
func PrependError(prepend string, err error) error {
msg := prepend + err.Error()
var te TException
if errors.As(err, &te) {
switch te.TExceptionType() {
case TExceptionTypeTransport:
if t, ok := err.(TTransportException); ok {
return prependTTransportException(prepend, t)
case TExceptionTypeProtocol:
if t, ok := err.(TProtocolException); ok {
return prependTProtocolException(prepend, t)
case TExceptionTypeApplication:
var t TApplicationException
if errors.As(err, &t) {
return NewTApplicationException(t.TypeId(), msg)
return wrappedTException{
err: err,
msg: msg,
tExceptionType: te.TExceptionType(),
return errors.New(msg)
// TExceptionType is an enum type to categorize different "subclasses" of TExceptions.
type TExceptionType byte
// TExceptionType values
const (
TExceptionTypeUnknown TExceptionType = iota
TExceptionTypeCompiled // TExceptions defined in thrift files and generated by thrift compiler
TExceptionTypeApplication // TApplicationExceptions
TExceptionTypeProtocol // TProtocolExceptions
TExceptionTypeTransport // TTransportExceptions
// WrapTException wraps an error into TException.
// If err is nil or already TException, it's returned as-is.
// Otherwise it will be wraped into TException with TExceptionType() returning
// TExceptionTypeUnknown, and Unwrap() returning the original error.
func WrapTException(err error) TException {
if err == nil {
return nil
if te, ok := err.(TException); ok {
return te
return wrappedTException{
err: err,
msg: err.Error(),
tExceptionType: TExceptionTypeUnknown,
type wrappedTException struct {
err error
msg string
tExceptionType TExceptionType
func (w wrappedTException) Error() string {
return w.msg
func (w wrappedTException) TExceptionType() TExceptionType {
return w.tExceptionType
func (w wrappedTException) Unwrap() error {
return w.err
var _ TException = wrappedTException{}