[jira] [Updated] (THRIFT-2854) Go Struct writer and reader looses important error information

["Jens Geyer (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/THRIFT-2854?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jens Geyer updated THRIFT-2854:
-------------------------------
    Summary: Go Struct writer and reader looses important error information  (was: GO Struct writer and reader looses important error information)

> Go Struct writer and reader looses important error information
> --------------------------------------------------------------
>
>                 Key: THRIFT-2854
>                 URL: https://issues.apache.org/jira/browse/THRIFT-2854
>             Project: Thrift
>          Issue Type: Bug
>          Components: Go - Compiler
>    Affects Versions: 0.9.2
>            Reporter: Chi Vinh Le
>             Fix For: 0.9.3
>
>
> The GO Compiler generates code for a struct so that the following occurs:
> When an error occurs while reading or writing, a new error is created with additional text information using {code}fmt.Errorf{code}.
> By doing this the original error is completely lost. This is a real problem because errors of type TTransportException and TProtocolExceptions which contain additional information are lost. This will cause bad error handling, as the server implementation is dependent on those information.
> In my personal fork, I have a quick'n dirty fix for this, but I'm looking for a better option.
> Maybe instead of {code}fmt.Errorf{code} we could use this:
> {code}
> // Prepends additional information to an error without losing the Thrift interface
> func PrependError(err error, prepend string) error {
>   if t, ok := err.(TTransportException); ok {
>     return NewTTransportException(t.TypeId(), prepend+t.Error())
>   }
>   if t, ok := err.(TProtocolException); ok {
>     return NewTProtocolExceptionWithType(t.TypeId(), errors.New(prepend+err.Error()))
>   }
>   if t, ok := err.(TApplicationException); ok {
>     return NewTApplicationException(t.TypeId(), prepend+t.Error())
>   }
>   return errors.New(prepend + err.Error())
> }
> {code}
> I want to discuss this first here, because making a patch is quiet some work and I don't want major changes after I create a fix.



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