0024: propagate errors in find_*_rate

brmbar3/schema/0024-find-rates-fix.sql

@@ -0,0 +1,89 @@
+--
+-- 0024-find-rates-fix.sql
+--
+-- #23 - fix stored functions find_buy_rate and find_sell_rate
+--
+-- ISC License
+--
+-- Copyright 2023-2025 Brmlab, z.s.
+-- TMA <tma+hs@jikos.cz>
+--
+-- Permission to use, copy, modify, and/or distribute this software
+-- for any purpose with or without fee is hereby granted, provided
+-- that the above copyright notice and this permission notice appear
+-- in all copies.
+--
+-- THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
+-- WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
+-- WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
+-- AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR
+-- CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
+-- OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
+-- NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+-- CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+--
+
+-- To require fully-qualified names
+SELECT pg_catalog.set_config('search_path', '', false);
+
+DO $upgrade_block$
+BEGIN
+
+IF brmbar_privileged.has_exact_schema_version(23) THEN
+
+CREATE OR REPLACE FUNCTION public.find_buy_rate(
+	IN i_item_currency_id public.accounts.id%TYPE,
+	IN i_other_currency_id public.accounts.id%TYPE
+) RETURNS NUMERIC
+LANGUAGE plpgsql
+AS $$
+DECLARE
+	v_rate public.exchange_rates.rate%TYPE;
+	v_rate_dir public.exchange_rates.rate_dir%TYPE;
+BEGIN
+        SELECT rate, rate_dir INTO STRICT v_rate, v_rate_dir FROM public.exchange_rates WHERE target = i_item_currency_id AND source = i_other_currency_id AND valid_since <= NOW() ORDER BY valid_since DESC LIMIT 1;
+	IF v_rate_dir = 'target_to_source'::public.exchange_rate_direction THEN
+		RETURN v_rate;
+	ELSE
+		RETURN 1/v_rate;
+	END IF;
+	/* propagate error
+EXCEPTION
+	WHEN NO_DATA_FOUND THEN
+		RETURN -1;
+	*/
+END;
+$$;
+
+-- return negative number on rate not found
+CREATE OR REPLACE FUNCTION public.find_sell_rate(
+	IN i_item_currency_id public.accounts.id%TYPE,
+	IN i_other_currency_id public.accounts.id%TYPE
+) RETURNS NUMERIC
+LANGUAGE plpgsql
+AS $$
+DECLARE
+	v_rate public.exchange_rates.rate%TYPE;
+	v_rate_dir public.exchange_rates.rate_dir%TYPE;
+BEGIN
+        SELECT rate, rate_dir INTO STRICT v_rate, v_rate_dir FROM public.exchange_rates WHERE target = i_other_currency_id AND source = i_item_currency_id AND valid_since <= NOW() ORDER BY valid_since DESC LIMIT 1;
+	IF v_rate_dir = 'source_to_target'::public.exchange_rate_direction THEN
+		RETURN v_rate;
+	ELSE
+		RETURN 1/v_rate;
+	END IF;
+	/* propagate error
+EXCEPTION
+	WHEN NO_DATA_FOUND THEN
+		RETURN -1;
+	*/
+END;
+$$;
+
+PERFORM brmbar_privileged.upgrade_schema_version_to(24);
+END IF;
+
+END;
+$upgrade_block$;
+
+-- vim: set ft=plsql :