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Add general check function "check_replication_slots_available()"

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Make the code previously only used by "standby follow" generally
available - we'll want to use this from "node rejoin" as well.

While we're at it, when reporting failure due to lack of free
replication slots, report the current value of "max_replication_slots".
This commit is contained in:
Ian Barwick
2020-02-03 16:42:04 +09:00
parent ab9c84c655
commit cd7f36a6fd
6 changed files with 48 additions and 25 deletions
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13
dbutils.c
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@@ -4398,7 +4398,7 @@ get_slot_record(PGconn *conn, char *slot_name, t_replication_slot *record)
int
get_free_replication_slot_count(PGconn *conn)
get_free_replication_slot_count(PGconn *conn, int *max_replication_slots)
{
PQExpBufferData query;
PGresult *res = NULL;
@@ -4408,7 +4408,10 @@ get_free_replication_slot_count(PGconn *conn)
appendPQExpBufferStr(&query,
" SELECT pg_catalog.current_setting('max_replication_slots')::INT - "
" pg_catalog.count(*) AS free_slots"
" pg_catalog.count(*) "
" AS free_slots, "
" pg_catalog.current_setting('max_replication_slots')::INT "
" AS max_replication_slots "
" FROM pg_catalog.pg_replication_slots s"
" WHERE s.slot_type = 'physical'");
@@ -4419,15 +4422,17 @@ get_free_replication_slot_count(PGconn *conn)
log_db_error(conn, query.data,
_("get_free_replication_slot_count(): unable to execute replication slot query"));
free_slots = -1;
free_slots = UNKNOWN_VALUE;
}
else if (PQntuples(res) == 0)
{
free_slots = -1;
free_slots = UNKNOWN_VALUE;
}
else
{
free_slots = atoi(PQgetvalue(res, 0, 0));
if (max_replication_slots != NULL)
*max_replication_slots = atoi(PQgetvalue(res, 0, 1));
}
termPQExpBuffer(&query);