Re: pg_hba_file_settings view patch

On Thu, Jan 26, 2017 at 11:36 PM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> Haribabu Kommi <kommi(dot)haribabu(at)gmail(dot)com> writes:
>> This patch currently doesn't have the code for reporting the two log
>> messages that can occur in tokenize_file function. To support the same,
>> I am thinking of changing line_nums list to line_info list that can
>> contain both line number and the error message that occurred during the
>> tokenize. This list data is used to identify whether that line is having
>> any error or not before parsing that hba line, and directly report that
>> line as error in the view.
>
> Yeah, perhaps. tokenize_file() has pushed the return-parallel-lists
> notion to the limit of sanity already. It would make more sense to
> change it to return a single list containing one struct per line,
> which would include the token list, raw line text, and line number.
>
> It might make sense to proceed by writing a separate patch that just
> refactors the existing code to have an API like that, and then revise
> this patch to add an error message field to the per-line struct. Or
> maybe that's just extra work, not sure.

Beginning with a cleaner state the feature implementation would likely
facilitate the restructuring work of pg_hba_rules and its overall
size, so doing the refactoring work first would make the most sense.
--
Michael