def test_rates(self):
# Initially, there will not be any exchange rate information
rates = Rate.objects.all()
self.assertEqual(rates.count(), 0)
# Without rate information, we cannot convert anything...
with self.assertRaises(MissingRate):
convert_money(Money(100, 'USD'), 'AUD')
with self.assertRaises(MissingRate):
convert_money(Money(100, 'AUD'), 'USD')
InvenTree.tasks.update_exchange_rates()
rates = Rate.objects.all()
self.assertEqual(rates.count(), len(currency_codes()))
# Now that we have some exchange rate information, we can perform conversions
# Forwards
convert_money(Money(100, 'USD'), 'AUD')
# Backwards
convert_money(Money(100, 'AUD'), 'USD')
# Convert between non base currencies
convert_money(Money(100, 'CAD'), 'NZD')
# Convert to a symbol which is not covered
with self.assertRaises(MissingRate):
convert_money(Money(100, 'GBP'), 'ZWL')
def test_rates(self):
# Initially, there will not be any exchange rate information
rates = Rate.objects.all()
self.assertEqual(rates.count(), 0)
# Without rate information, we cannot convert anything...
with self.assertRaises(MissingRate):
convert_money(Money(100, 'USD'), 'AUD')
with self.assertRaises(MissingRate):
convert_money(Money(100, 'AUD'), 'USD')
update_successful = False
# Note: the update sometimes fails in CI, let's give it a few chances
for idx in range(10):
InvenTree.tasks.update_exchange_rates()
rates = Rate.objects.all()
if rates.count() == len(currency_codes()):
update_successful = True
break
else: # pragma: no cover
print("Exchange rate update failed - retrying")
time.sleep(1)
self.assertTrue(update_successful)
# Now that we have some exchange rate information, we can perform conversions
# Forwards
convert_money(Money(100, 'USD'), 'AUD')
# Backwards
convert_money(Money(100, 'AUD'), 'USD')
# Convert between non base currencies
convert_money(Money(100, 'CAD'), 'NZD')
# Convert to a symbol which is not covered
with self.assertRaises(MissingRate):
convert_money(Money(100, 'GBP'), 'ZWL')
def update_exchange_rates():
"""
Update currency exchange rates
"""
try:
from djmoney.contrib.exchange.models import ExchangeBackend, Rate
from common.settings import currency_code_default, currency_codes
from InvenTree.exchange import InvenTreeExchange
except AppRegistryNotReady: # pragma: no cover
# Apps not yet loaded!
logger.info(
"Could not perform 'update_exchange_rates' - App registry not ready"
)
return
except: # pragma: no cover
# Other error?
return
# Test to see if the database is ready yet
try:
backend = ExchangeBackend.objects.get(name='InvenTreeExchange')
except ExchangeBackend.DoesNotExist:
pass
except: # pragma: no cover
# Some other error
logger.warning("update_exchange_rates: Database not ready")
return
backend = InvenTreeExchange()
logger.info(f"Updating exchange rates from {backend.url}")
base = currency_code_default()
logger.info(f"Using base currency '{base}'")
try:
backend.update_rates(base_currency=base)
# Remove any exchange rates which are not in the provided currencies
Rate.objects.filter(backend="InvenTreeExchange").exclude(
currency__in=currency_codes()).delete()
except Exception as e: # pragma: no cover
logger.error(f"Error updating exchange rates: {e}")
def update_rates(self, base_currency=currency_code_default()):
symbols = ','.join(currency_codes())
try:
super().update_rates(base=base_currency, symbols=symbols)
# catch connection errors
except URLError:
print('Encountered connection error while updating')
except OperationalError as e:
if 'SerializationFailure' in e.__cause__.__class__.__name__:
print('Serialization Failure while updating exchange rates')
# We are just going to swallow this exception because the
# exchange rates will be updated later by the scheduled task
else:
# Other operational errors probably are still show stoppers
# so reraise them so that the log contains the stacktrace
raise
