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Add function get_timeline_history()

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This will be required for verifying whether one node is able to
follow another node.
This commit is contained in:
Ian Barwick
2018-11-22 14:49:02 +09:00
parent b223cb4cee
commit 80a280cbf4
2 changed files with 69 additions and 0 deletions
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65
dbutils.c
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@@ -1602,6 +1602,71 @@ identify_system(PGconn *repl_conn, t_system_identification *identification)
return true;
}
TimeLineHistoryEntry *
get_timeline_history(PGconn *repl_conn, TimeLineID tli)
{
PQExpBufferData query;
PGresult *res = NULL;
int nfields;
TimeLineID file_tli;
uint32 switchpoint_hi;
uint32 switchpoint_lo;
TimeLineHistoryEntry *history;
initPQExpBuffer(&query);
appendPQExpBuffer(&query,
"TIMELINE_HISTORY %i",
(int)tli);
res = PQexec(repl_conn, query.data);
log_verbose(LOG_DEBUG, "get_timeline_history():\n%s", query.data);
if (PQresultStatus(res) != PGRES_TUPLES_OK)
{
log_db_error(repl_conn, query.data, _("get_timeline_history(): unable to execute query"));
termPQExpBuffer(&query);
PQclear(res);
return NULL;
}
termPQExpBuffer(&query);
if (PQnfields(res) != 2 || PQntuples(res) != 1)
{
log_error(_("unexpected response to TIMELINE_HISTORY command"));
log_detail(_("got %i rows and %i fields, expected %i rows and %i fields"),
PQntuples(res), PQnfields(res), 1, 2);
PQclear(res);
return NULL;
}
nfields = sscanf(PQgetvalue(res, 0, 1),
"%u\t%X/%X",
&file_tli, &switchpoint_hi, &switchpoint_lo);
if (nfields != 3)
{
log_error(_("unable to parse timeline history file content"));
log_detail(_("content is: \"%s\""), PQgetvalue(res, 0, 1));
PQclear(res);
return NULL;
}
history = (TimeLineHistoryEntry *) palloc(sizeof(TimeLineHistoryEntry));
history->tli = file_tli;
history->begin = InvalidXLogRecPtr; /* we don't care about this */
history->end = ((uint64) (switchpoint_hi)) << 32 | (uint64) switchpoint_lo;
PQclear(res);
return history;
}
/* =============================== */
/* repmgrd shared memory functions */
/* =============================== */
bool
repmgrd_set_local_node_id(PGconn *conn, int local_node_id)