forked from brmlab/brmbar-github
#9: stored function for sell transaction
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aded7a5769
commit
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3 changed files with 175 additions and 17 deletions
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@ -40,18 +40,20 @@ class Currency:
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""" Return tuple ($buy, $sell) of rates of $self in relation to $other (brmbar.Currency):
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$buy is the price of $self in means of $other when buying it (into brmbar)
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$sell is the price of $self in means of $other when selling it (from brmbar) """
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res = self.db.execute_and_fetch("SELECT rate, rate_dir FROM exchange_rates WHERE target = %s AND source = %s AND valid_since <= NOW() ORDER BY valid_since DESC LIMIT 1", [self.id, other.id])
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# buy rate
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res = self.db.execute_and_fetch("SELECT public.find_buy_rate(%s, %s)",[self.id, other.id])
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if res is None:
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raise NameError("Something fishy in find_buy_rate.");
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buy = res[0]
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if buy < 0:
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raise NameError("Currency.rate(): Unknown conversion " + other.name() + " to " + self.name())
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buy_rate, buy_rate_dir = res
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buy = buy_rate if buy_rate_dir == "target_to_source" else 1/buy_rate
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res = self.db.execute_and_fetch("SELECT rate, rate_dir FROM exchange_rates WHERE target = %s AND source = %s AND valid_since <= NOW() ORDER BY valid_since DESC LIMIT 1", [other.id, self.id])
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# sell rate
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res = self.db.execute_and_fetch("SELECT public.find_sell_rate(%s, %s)",[self.id, other.id])
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if res is None:
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raise NameError("Something fishy in find_sell_rate.");
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sell = res[0]
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if sell < 0:
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raise NameError("Currency.rate(): Unknown conversion " + self.name() + " to " + other.name())
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sell_rate, sell_rate_dir = res
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sell = sell_rate if sell_rate_dir == "source_to_target" else 1/sell_rate
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return (buy, sell)
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@ -25,18 +25,25 @@ class Shop:
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deficit = Account.load(db, name = "BrmBar Deficit"))
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def sell(self, item, user, amount = 1):
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# Sale: Currency conversion from item currency to shop currency
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(buy, sell) = item.currency.rates(self.currency)
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cost = amount * sell
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profit = amount * (sell - buy)
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# Call the stored procedure for the sale
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cost = self.db.execute_and_fetch(
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"SELECT public.sell_item(%s, %s, %s, %s, %s)",
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[item.id, amount, user.id, self.currency.id, f"BrmBar sale of {amount}x {item.name} to {user.name}"]
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)[0]#[0]
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transaction = self._transaction(responsible = user, description = "BrmBar sale of {}x {} to {}".format(amount, item.name, user.name))
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item.credit(transaction, amount, user.name)
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user.debit(transaction, cost, item.name) # debit (increase) on a _debt_ account
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self.profits.debit(transaction, profit, "Margin on " + item.name)
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self.db.commit()
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return cost
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# Sale: Currency conversion from item currency to shop currency
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#(buy, sell) = item.currency.rates(self.currency)
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#cost = amount * sell
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#profit = amount * (sell - buy)
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#transaction = self._transaction(responsible = user, description = "BrmBar sale of {}x {} to {}".format(amount, item.name, user.name))
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#item.credit(transaction, amount, user.name)
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#user.debit(transaction, cost, item.name) # debit (increase) on a _debt_ account
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#self.profits.debit(transaction, profit, "Margin on " + item.name)
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#self.db.commit()
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#return cost
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def sell_for_cash(self, item, amount = 1):
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# Sale: Currency conversion from item currency to shop currency
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149
brmbar3/schema/0009-shop-sell.sql
Normal file
149
brmbar3/schema/0009-shop-sell.sql
Normal file
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@ -0,0 +1,149 @@
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--
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-- 0009-shop-sell.sql
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--
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-- #9 - stored function for sell transaction
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--
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-- ISC License
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--
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-- Copyright 2023-2025 Brmlab, z.s.
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-- TMA <tma+hs@jikos.cz>
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--
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-- Permission to use, copy, modify, and/or distribute this software
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-- for any purpose with or without fee is hereby granted, provided
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-- that the above copyright notice and this permission notice appear
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-- in all copies.
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--
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-- THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
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-- WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
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-- WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
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-- AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR
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-- CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
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-- OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
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-- NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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-- CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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--
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-- To require fully-qualified names
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SELECT pg_catalog.set_config('search_path', '', false);
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DO $upgrade_block$
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BEGIN
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IF brmbar_privileged.has_exact_schema_version(8) THEN
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-- return negative number on rate not found
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CREATE OR REPLACE FUNCTION public.find_buy_rate(
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IN i_item_id public.accounts.id%TYPE;
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IN i_other_id public.accounts.id%TYPE;
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) RETURNS NUMERIC
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LANGUAGE plpgsql
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AS $$
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DECLARE
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v_rate public.exchange_rates.rate%TYPE;
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v_rate_dir public.exchange_rates.rate_dir%TYPE;
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BEGIN
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SELECT rate INTO STRICT v_rate, rate_dir INTO STRICT v_rate_dir FROM public.exchange_rates WHERE target = i_item_id AND source = i_other_id AND valid_since <= NOW() ORDER BY valid_since DESC LIMIT 1;
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IF v_rate_dir = 'target_to_source'::public.exchange_rate_direction THEN
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RETURN v_rate;
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ELSE
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RETURN 1/v_rate;
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END IF;
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EXCEPTION
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WHEN NO_DATA_FOUND THEN
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RETURN -1;
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END;
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$$
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-- return negative number on rate not found
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CREATE OR REPLACE FUNCTION public.find_sell_rate(
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IN i_item_id public.accounts.id%TYPE;
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IN i_other_id public.accounts.id%TYPE;
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) RETURNS NUMERIC
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LANGUAGE plpgsql
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AS $$
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DECLARE
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v_rate public.exchange_rates.rate%TYPE;
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v_rate_dir public.exchange_rates.rate_dir%TYPE;
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BEGIN
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SELECT rate INTO STRICT v_rate, rate_dir INTO STRICT v_rate_dir FROM public.exchange_rates WHERE target = i_other_id AND source = i_item_id AND valid_since <= NOW() ORDER BY valid_since DESC LIMIT 1;
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IF v_rate_dir = 'source_to_target'::public.exchange_rate_direction THEN
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RETURN v_rate;
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ELSE
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RETURN 1/v_rate;
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END IF;
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EXCEPTION
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WHEN NO_DATA_FOUND THEN
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RETURN -1;
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END;
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$$
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CREATE OR REPLACE FUNCTION public.create_transaction(
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i_responsible_id public.accounts.id%TYPE,
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i_description public.transactions.description%TYPE
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) RETURNS public.transactions.id%TYPE AS $$
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DECLARE
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new_transaction_id public.transactions%TYPE;
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BEGIN
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-- Create a new transaction
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INSERT INTO transactions (responsible, description)
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VALUES (i_responsible_id, i_description)
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RETURNING id INTO new_transaction_id;
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-- Return the new transaction ID
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RETURN new_transaction_id;
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END;
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$$ LANGUAGE plpgsql;
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CREATE OR REPLACE FUNCTION public.sell_item(
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i_item_id public.accounts.id%TYPE,
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i_amount INTEGER,
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i_user_id public.accounts.id%TYPE,
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i_target_currency_id public.currencies.id%TYPE,
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i_description TEXT
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) RETURNS NUMERIC
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LANGUAGE plpgsql
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AS $$
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DECLARE
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v_buy_rate NUMERIC;
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v_sell_rate NUMERIC;
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v_cost NUMERIC;
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v_profit NUMERIC;
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v_transaction_id public.transactions.id%TYPE;
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BEGIN
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-- Get the buy and sell rates from the stored functions
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v_buy_rate := find_buy_rate(i_item_id, i_target_currency_id);
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v_sell_rate := find_sell_rate(i_item_id, i_target_currency_id);
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-- Calculate cost and profit
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v_cost := i_amount * v_sell_rate;
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v_profit := i_amount * (v_sell_rate - v_buy_rate);
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-- Create a new transaction
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v_transaction_id := create_transaction(i_user_id, i_description);
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-- the item (decrease stock)
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INSERT INTO transaction_splits (transaction, side, account, amount, memo)
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VALUES (i_transaction_id, 'credit', i_item_id, i_amount,
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(SELECT "name" FROM public.accounts WHERE id = i_user_id));
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-- the user
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INSERT INTO transaction_splits (transaction, side, account, amount, memo)
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VALUES (i_transaction_id, 'debit', i_user_id, v_cost,
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(SELECT "name" FROM public.accounts WHERE id = i_item_id));
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-- the profit
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INSERT INTO transaction_splits (transaction, side, account, amount, memo)
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VALUES (i_transaction_id, 'debit', (SELECT account_id FROM accounts WHERE name = 'BrmBar Profits'), v_profit, (SELECT 'Margin on ' || "name" FROM public.accounts WHERE id = i_item_id));
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-- Return the cost
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RETURN v_cost;
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END;
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$$;
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PERFORM brmbar_privileged.upgrade_schema_version_to(9);
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END IF;
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END;
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$upgrade_block$;
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-- vim: set ft=plsql :
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