relay/migrations/2020-03-25-211630_add-node-notifications/up.sql

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-- Your SQL goes here
CREATE OR REPLACE FUNCTION invoke_nodes_trigger ()
RETURNS TRIGGER
LANGUAGE plpgsql
AS $$
DECLARE
rec RECORD;
channel TEXT;
payload TEXT;
BEGIN
case TG_OP
WHEN 'INSERT' THEN
rec := NEW;
channel := 'new_nodes';
payload := NEW.listener_id;
WHEN 'UPDATE' THEN
rec := NEW;
channel := 'new_nodes';
payload := NEW.listener_id;
WHEN 'DELETE' THEN
rec := OLD;
channel := 'rm_nodes';
payload := OLD.listener_id;
ELSE
RAISE EXCEPTION 'Unknown TG_OP: "%". Should not occur!', TG_OP;
END CASE;
PERFORM pg_notify(channel, payload::TEXT);
RETURN rec;
END;
$$;
CREATE TRIGGER nodes_notify
AFTER INSERT OR UPDATE OR DELETE
ON nodes
FOR EACH ROW
EXECUTE PROCEDURE invoke_nodes_trigger();