Re: Allow escape in application_name

From: Fujii Masao <masao(dot)fujii(at)oss(dot)nttdata(dot)com>
To: "kuroda(dot)hayato(at)fujitsu(dot)com" <kuroda(dot)hayato(at)fujitsu(dot)com>, Kyotaro Horiguchi <horikyota(dot)ntt(at)gmail(dot)com>
Cc: "houzj(dot)fnst(at)fujitsu(dot)com" <houzj(dot)fnst(at)fujitsu(dot)com>, "ikedamsh(at)oss(dot)nttdata(dot)com" <ikedamsh(at)oss(dot)nttdata(dot)com>, "pgsql-hackers(at)lists(dot)postgresql(dot)org" <pgsql-hackers(at)lists(dot)postgresql(dot)org>, "tgl(at)sss(dot)pgh(dot)pa(dot)us" <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Subject: Re: Allow escape in application_name
Date: 2021-12-27 04:39:54
Message-ID: e7b61420-a97b-8246-77c4-a0d48fba5a45@oss.nttdata.com
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On 2021/12/27 10:40, kuroda(dot)hayato(at)fujitsu(dot)com wrote:
> Dear Fujii-san, Horiguchi-san,
>
> I confirmed that the feature was committed but reverted the test.
> Now I'm checking buildfarm.

Attached is the patch that adds the regression test for postgres_fdw.application_name. Could you review this?

As Horiguchi-san suggested at [1], I split the test into two, and then tweaked them as follows.

1. Set application_name option of a server option to 'fdw_%d%p'
2. Set postgres_fdw.application_name to 'fdw_%a%u%%'

'fdw_%d%p' and 'fdw_%a%u%%' still may be larger than NAMEDATALEN depending on the regression test environment. To make the test stable even in that case, the patch uses substring() is truncate application_name string in the test query's condition to less than NAMEDATALEN.

[1]
https://postgr.es/m/20211224.184406.814784272581964942.horikyota.ntt@gmail.com

> But anyway I want to say thank you for your contribution!

Thanks!

Regards,

--
Fujii Masao
Advanced Computing Technology Center
Research and Development Headquarters
NTT DATA CORPORATION

Attachment Content-Type Size
pgfdw_appname_regression_test_v1.patch text/plain 4.3 KB

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