strem replication standby lag check

hi, all,

I know we can connect to primary and SELECT pg_current_xlog_location(); (eg.
'0/36A77900') to get primary xlog position then connect to the standby to do
the following to get the byte lag:

select pg_xlog_location_diff('0/36A77900',pg_last_xlog_replay_location());

0/36A77900 is the xlog position from primary.

My question is that is there a way I can connect to the primary on the
standby host using replica user which i already have the primary_conninfo in
the recovery.conf and get the result of SELECT pg_current_xlog_location();
of the primary so I can simply write a function on the standby to return the
lag in bytes in one call.

any way I can do that without a dblink?

Thank you if any one can help.

best,
Ying

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