Re: Add test module for verifying backtrace functionality

On Tue, Feb 13, 2024 at 2:11 AM Bharath Rupireddy
<bharath.rupireddyforpostgres@gmail.com> wrote:
>
> Hi,
>
> Postgres has a good amount of code for dealing with backtraces - two
> GUCs backtrace_functions and backtrace_on_internal_error,
> errbacktrace; all of which use core function set_backtrace from
> elog.c. I've not seen this code being tested at all, see code coverage
> report - https://coverage.postgresql.org/src/backend/utils/error/elog.c.gcov.html.
>
> I think adding a simple test module (containing no .c files) with only
> TAP tests will help cover this code. I ended up having it as a
> separate module under src/test/modules/test_backtrace as I was not
> able to find an existing TAP file in src/test to add these tests.  I'm
> able to verify the backtrace related code with the attached patch
> consistently. The TAP tests rely on the fact that the server emits
> text "BACKTRACE: " to server logs before logging the backtrace, and
> the backtrace contains the function name in which the error occurs.
> I've turned off query statement logging (set log_statement = none,
> log_min_error_statement = fatal) so that the tests get to see the
> functions only in the backtrace. Although the CF bot is happy with the
> attached patch https://github.com/BRupireddy2/postgres/tree/add_test_module_for_bcktrace_functionality_v1,
> there might be some more flakiness to it.
>
> Thoughts?

Ran pgperltidy on the new TAP test file added. Please see the attached v2 patch.

--
Bharath Rupireddy
PostgreSQL Contributors Team
RDS Open Source Databases
Amazon Web Services: https://aws.amazon.com