Trigger function always logs postgres as user name

Hi,

I setup trigger functions for logging, and while they do work and get triggered, the current_user always insert “postgres” even when updates/deletes/inserts are caused by users of another name.

How do I get it to use the name that caused the update? It seems current_user is the trigger’s user, so the server itself in some way. This is on PG10

Here the function:
BEGIN

IF TG_OP = 'INSERT'

THEN

INSERT INTO logging (tabname, schemaname, who, operation, new_val)

VALUES (TG_RELNAME, TG_TABLE_SCHEMA, current_user, TG_OP, row_to_json(NEW));

RETURN NEW;

ELSIF TG_OP = 'UPDATE'

THEN

INSERT INTO logging (tabname, schemaname, who, operation, new_val, old_val)

VALUES (TG_RELNAME, TG_TABLE_SCHEMA, current_user, TG_OP,

row_to_json(NEW), row_to_json(OLD));

RETURN NEW;

ELSIF TG_OP = 'DELETE'

THEN

INSERT INTO logging (tabname, schemaname, operation, who, old_val)

VALUES (TG_RELNAME, TG_TABLE_SCHEMA, TG_OP, current_user, row_to_json(OLD));

RETURN OLD;

END IF;

END;

Cheers,
Alex