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Add hooks for session start and session end, take two

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These hooks can be used in loadable modules.  A simple test module is
included.

The first attempt was done with cd8ce3a but we lacked handling for
NO_INSTALLCHECK in the MSVC scripts (problem solved afterwards by
431f1599) so the buildfarm got angry.  This also fixes a couple of
issues noticed upon review compared to the first attempt, so the code
has slightly changed, resulting in a more simple test module.

Author: Fabrízio de Royes Mello, Yugo Nagata
Reviewed-by: Andrew Dunstan, Michael Paquier, Aleksandr Parfenov
Discussion: https://postgr.es/m/20170720204733.40f2b7eb.nagata@sraoss.co.jp
Discussion: https://postgr.es/m/20190823042602.GB5275@paquier.xyz
This commit is contained in:
Michael Paquier
2019-10-01 12:15:25 +09:00
parent 41a6de41ed
commit e788bd924c
11 changed files with 262 additions and 0 deletions
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6
src/backend/tcop/postgres.c
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@@ -171,6 +171,9 @@ static ProcSignalReason RecoveryConflictReason;
static MemoryContext row_description_context = NULL;
static StringInfoData row_description_buf;
/* Hook for plugins to get control at start of session */
session_start_hook_type session_start_hook = NULL;
/* ----------------------------------------------------------------
* decls for routines only used in this file
* ----------------------------------------------------------------
@@ -3968,6 +3971,9 @@ PostgresMain(int argc, char *argv[],
if (!IsUnderPostmaster)
PgStartTime = GetCurrentTimestamp();
if (session_start_hook)
(*session_start_hook) ();
/*
* POSTGRES main processing loop begins here
*