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repmgrd: add option "connection_check_type"

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This enable selection of the method repmgrd uses to check whether the upstream
node is available. Possible values are:

 - "ping" (default): uses PQping() to check server availability
 - "connection":  executes a query on the connection to check server
   availability (similar to repmgr3.x).
This commit is contained in:
Ian Barwick
2019-03-06 12:07:30 +09:00
parent 4f83111033
commit 63f7ad546e
11 changed files with 150 additions and 23 deletions
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52
repmgrd.c
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@@ -818,6 +818,58 @@ show_help(void)
}
bool
check_upstream_connection(PGconn *conn, const char *conninfo)
{
/* Check the connection status twice in case it changes after reset */
bool twice = false;
if (config_file_options.connection_check_type == CHECK_PING)
return is_server_available(conninfo);
for (;;)
{
if (PQstatus(conn) != CONNECTION_OK)
{
if (twice)
return false;
PQreset(conn); /* reconnect */
twice = true;
}
else
{
if (!cancel_query(conn, config_file_options.async_query_timeout))
goto failed;
if (wait_connection_availability(conn, config_file_options.async_query_timeout) != 1)
goto failed;
/* execute a simple query to verify connection availability */
if (PQsendQuery(conn, "SELECT 1") == 0)
{
log_warning(_("unable to send query to upstream"));
log_detail("%s", PQerrorMessage(conn));
goto failed;
}
if (wait_connection_availability(conn, config_file_options.async_query_timeout) != 1)
goto failed;
break;
failed:
/* retry once */
if (twice)
return false;
PQreset(conn); /* reconnect */
twice = true;
}
}
return true;
}
void
try_reconnect(PGconn **conn, t_node_info *node_info)
{