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#9: stored function for sell transaction

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TMA 2025-04-20 23:43:52 +02:00
parent aded7a5769
commit cef95c4313
3 changed files with 175 additions and 17 deletions
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18
brmbar3/brmbar/Currency.py
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@ -40,18 +40,20 @@ class Currency:
""" Return tuple ($buy, $sell) of rates of $self in relation to $other (brmbar.Currency):
$buy is the price of $self in means of $other when buying it (into brmbar)
$sell is the price of $self in means of $other when selling it (from brmbar) """
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])
# buy rate
res = self.db.execute_and_fetch("SELECT public.find_buy_rate(%s, %s)",[self.id, other.id])
if res is None:
raise NameError("Something fishy in find_buy_rate.");
buy = res[0]
if buy < 0:
raise NameError("Currency.rate(): Unknown conversion " + other.name() + " to " + self.name())
buy_rate, buy_rate_dir = res
buy = buy_rate if buy_rate_dir == "target_to_source" else 1/buy_rate
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])
# sell rate
res = self.db.execute_and_fetch("SELECT public.find_sell_rate(%s, %s)",[self.id, other.id])
if res is None:
raise NameError("Something fishy in find_sell_rate.");
sell = res[0]
if sell < 0:
raise NameError("Currency.rate(): Unknown conversion " + self.name() + " to " + other.name())
sell_rate, sell_rate_dir = res
sell = sell_rate if sell_rate_dir == "source_to_target" else 1/sell_rate
return (buy, sell)