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Add SQL functions to monitor the directory contents of replication slots

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This commit adds a set of functions able to look at the contents of
various paths related to replication slots:
- pg_ls_logicalsnapdir, for pg_logical/snapshots/
- pg_ls_logicalmapdir, for pg_logical/mappings/
- pg_ls_replslotdir, for pg_replslot/<slot_name>/

These are intended to be used by monitoring tools.  Unlike pg_ls_dir(),
execution permission can be granted to non-superusers.  Roles members of
pg_monitor gain have access to those functions.

Bump catalog version.

Author: Bharath Rupireddy
Reviewed-by: Nathan Bossart, Justin Pryzby
Discussion: https://postgr.es/m/CALj2ACWsfizZjMN6bzzdxOk1ADQQeSw8HhEjhmVXn_Pu+7VzLw@mail.gmail.com
This commit is contained in:
Michael Paquier
2021-11-23 19:29:42 +09:00
parent b55f2b6926
commit 1922d7c6e1
9 changed files with 250 additions and 1 deletions
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44
src/backend/utils/adt/genfile.c
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@ -29,6 +29,7 @@
#include "mb/pg_wchar.h"
#include "miscadmin.h"
#include "postmaster/syslogger.h"
#include "replication/slot.h"
#include "storage/fd.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@ -720,3 +721,46 @@ pg_ls_archive_statusdir(PG_FUNCTION_ARGS)
{
return pg_ls_dir_files(fcinfo, XLOGDIR "/archive_status", true);
}
/*
* Function to return the list of files in the pg_logical/snapshots directory.
*/
Datum
pg_ls_logicalsnapdir(PG_FUNCTION_ARGS)
{
return pg_ls_dir_files(fcinfo, "pg_logical/snapshots", false);
}
/*
* Function to return the list of files in the pg_logical/mappings directory.
*/
Datum
pg_ls_logicalmapdir(PG_FUNCTION_ARGS)
{
return pg_ls_dir_files(fcinfo, "pg_logical/mappings", false);
}
/*
* Function to return the list of files in the pg_replslot/<replication_slot>
* directory.
*/
Datum
pg_ls_replslotdir(PG_FUNCTION_ARGS)
{
text *slotname_t;
char path[MAXPGPATH];
char *slotname;
slotname_t = PG_GETARG_TEXT_PP(0);
slotname = text_to_cstring(slotname_t);
if (!SearchNamedReplicationSlot(slotname, true))
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("replication slot \"%s\" does not exist",
slotname)));
snprintf(path, sizeof(path), "pg_replslot/%s", slotname);
return pg_ls_dir_files(fcinfo, path, false);
}