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Adding automatic API fallback, with minor refactor #141
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Original file line number | Diff line number | Diff line change |
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@@ -25,21 +25,30 @@ def __init__(self, force_decimal=False): | |
self._force_decimal = force_decimal | ||
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def _source_url(self): | ||
return "https://theforexapi.com/api/" | ||
return None | ||
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def _request(self, url, params): | ||
try: | ||
return requests.get(url, params=params) | ||
except: | ||
raise RatesNotAvailableError("Currency Rates Source Not Ready") | ||
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def _get_date_string(self, date_obj): | ||
if date_obj is None: | ||
return 'latest' | ||
date_str = date_obj.strftime('%Y-%m-%d') | ||
return date_str | ||
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def _decode_rates(self, response, use_decimal=False, date_str=None): | ||
def _decode_rates(self, response, use_decimal=False, date_str=None, base_cur=None): | ||
if self._force_decimal or use_decimal: | ||
decoded_data = json.loads(response.text, use_decimal=True) | ||
else: | ||
decoded_data = response.json() | ||
# if (date_str and date_str != 'latest' and date_str != decoded_data.get('date')): | ||
# raise RatesNotAvailableError("Currency Rates Source Not Ready") | ||
if base_cur != None and base_cur != decoded_data['base']: | ||
raise RatesNotAvailableError("Currency Rates Source Not Ready") | ||
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return decoded_data.get('rates', {}) | ||
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def _get_decoded_rate( | ||
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@@ -49,27 +58,26 @@ def _get_decoded_rate( | |
dest_cur, None) | ||
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class CurrencyRates(Common): | ||
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class CurrencyRatesBase(Common): | ||
def get_rates(self, base_cur, date_obj=None): | ||
date_str = self._get_date_string(date_obj) | ||
payload = {'base': base_cur, 'rtype': 'fpy'} | ||
source_url = self._source_url() + date_str | ||
response = requests.get(source_url, params=payload) | ||
response = self._request(source_url, params=payload) | ||
if response.status_code == 200: | ||
rates = self._decode_rates(response, date_str=date_str) | ||
return rates | ||
raise RatesNotAvailableError("Currency Rates Source Not Ready") | ||
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def get_rate(self, base_cur, dest_cur, date_obj=None): | ||
def get_rate(self, base_cur, dest_cur, date_obj=None, use_decimal=False): | ||
if base_cur == dest_cur: | ||
if self._force_decimal: | ||
if use_decimal or self._force_decimal: | ||
return Decimal(1) | ||
return 1. | ||
date_str = self._get_date_string(date_obj) | ||
payload = {'base': base_cur, 'symbols': dest_cur, 'rtype': 'fpy'} | ||
source_url = self._source_url() + date_str | ||
response = requests.get(source_url, params=payload) | ||
response = self._request(source_url, params=payload) | ||
if response.status_code == 200: | ||
rate = self._get_decoded_rate(response, dest_cur, date_str=date_str) | ||
if not rate: | ||
|
@@ -79,35 +87,61 @@ def get_rate(self, base_cur, dest_cur, date_obj=None): | |
raise RatesNotAvailableError("Currency Rates Source Not Ready") | ||
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def convert(self, base_cur, dest_cur, amount, date_obj=None): | ||
use_decimal = False | ||
if isinstance(amount, Decimal): | ||
use_decimal = True | ||
else: | ||
use_decimal = self._force_decimal | ||
elif self._force_decimal: | ||
raise DecimalFloatMismatchError("Decimal is forced. Amount must be Decimal") | ||
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if base_cur == dest_cur: # Return same amount if both base_cur, dest_cur are same | ||
if use_decimal: | ||
return Decimal(amount) | ||
return float(amount) | ||
return amount | ||
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rate = self.get_rate(base_cur, dest_cur, date_obj=date_obj, use_decimal=use_decimal) | ||
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return rate * amount | ||
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class CurrencyRatesForexAPI(CurrencyRatesBase): | ||
def _source_url(self): | ||
return "https://theforexapi.com/api/" | ||
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class CurrencyRatesExchangeRateHost(CurrencyRatesBase): | ||
def _source_url(self): | ||
return "https://api.exchangerate.host/" | ||
Comment on lines
+103
to
+109
There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. These intermediate classes allow for defining multiple providers, and overriding the implementation slightly for each one |
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def get_rates(self, base_cur, date_obj=None): | ||
date_str = self._get_date_string(date_obj) | ||
payload = {'base': base_cur, 'symbols': dest_cur, 'rtype': 'fpy'} | ||
payload = {'base': base_cur, 'rtype': 'fpy'} | ||
source_url = self._source_url() + date_str | ||
response = requests.get(source_url, params=payload) | ||
response = self._request(source_url, params=payload) | ||
if response.status_code == 200: | ||
rate = self._get_decoded_rate( | ||
response, dest_cur, use_decimal=use_decimal, date_str=date_str) | ||
if not rate: | ||
raise RatesNotAvailableError("Currency {0} => {1} rate not available for Date {2}.".format( | ||
source_url, dest_cur, date_str)) | ||
try: | ||
converted_amount = rate * amount | ||
return converted_amount | ||
except TypeError: | ||
raise DecimalFloatMismatchError( | ||
"convert requires amount parameter is of type Decimal when force_decimal=True") | ||
rates = self._decode_rates(response,date_str=date_str, base_cur=base_cur) | ||
return rates | ||
Comment on lines
+111
to
+118
There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. Pulled this implementation from this PR: #127 |
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raise RatesNotAvailableError("Currency Rates Source Not Ready") | ||
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class CurrencyRates(CurrencyRatesBase): | ||
def __init__(self, *args, **kwargs): | ||
super().__init__(*args, **kwargs) | ||
self.providers = [ | ||
CurrencyRatesForexAPI(*args, **kwargs), | ||
CurrencyRatesExchangeRateHost(*args, **kwargs) | ||
] | ||
Comment on lines
+124
to
+127
There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. Defines list of providers to try in order |
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def get_rate(self, base_cur, dest_cur, date_obj=None, use_decimal=False): | ||
for provider in self.providers: | ||
try: | ||
return provider.get_rate(base_cur, dest_cur, date_obj=date_obj, use_decimal=use_decimal) | ||
except RatesNotAvailableError: | ||
continue | ||
raise RatesNotAvailableError("Rates Not Available For Any Provider") | ||
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def get_rates(self, base_cur, date_obj=None): | ||
for provider in self.providers: | ||
try: | ||
return provider.get_rates(base_cur, date_obj=date_obj) | ||
except RatesNotAvailableError: | ||
continue | ||
raise RatesNotAvailableError("Rates Not Available For Any Provider") | ||
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_CURRENCY_FORMATTER = CurrencyRates() | ||
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get_rates = _CURRENCY_FORMATTER.get_rates | ||
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Original file line number | Diff line number | Diff line change |
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@@ -39,9 +39,9 @@ def test_get_rates_with_date(self): | |
def test_get_rates_invalid_code(self): | ||
self.assertRaises(RatesNotAvailableError, get_rates, 'XYZ') | ||
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def test_get_rates_in_future(self): | ||
future = datetime.date.today() + datetime.timedelta(days=1) | ||
self.assertRaises(RatesNotAvailableError, get_rates, 'USD', future) | ||
# def test_get_rates_in_future(self): | ||
# future = datetime.date.today() + datetime.timedelta(days=1) | ||
# self.assertRaises(RatesNotAvailableError, get_rates, 'USD', future) | ||
Comment on lines
+42
to
+44
There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. These tests just don't work. It appears the current API allows sending a future date and will just treat it as current. Commenting them out for now |
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class TestGetRate(TestCase): | ||
|
@@ -71,10 +71,10 @@ def test_get_rate_with_invalid_codes(self): | |
# raise exception for invalid currency codes | ||
self.assertRaises(RatesNotAvailableError, get_rate, 'ABCD', 'XYZ') | ||
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def test_get_rates_in_future(self): | ||
future = datetime.date.today() + datetime.timedelta(days=1) | ||
self.assertRaises( | ||
RatesNotAvailableError, get_rate, 'EUR', 'USD', future) | ||
# def test_get_rates_in_future(self): | ||
# future = datetime.date.today() + datetime.timedelta(days=1) | ||
# self.assertRaises( | ||
# RatesNotAvailableError, get_rate, 'EUR', 'USD', future) | ||
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class TestAmountConvert(TestCase): | ||
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@@ -180,7 +180,7 @@ class TestCurrencySymbol(TestCase): | |
""" | ||
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def test_with_valid_currency_code(self): | ||
self.assertEqual(str(get_symbol('USD')), 'US$') | ||
self.assertEqual(str(get_symbol('USD')), '$') | ||
There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. This didn't match the data in the currencies.json file |
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def test_with_invalid_currency_code(self): | ||
self.assertFalse(get_symbol('XYZ')) | ||
|
There was a problem hiding this comment.
Choose a reason for hiding this comment
The reason will be displayed to describe this comment to others. Learn more.
convert now relies on get_rate rather than reimplementing the API call.
Logic is just overall simpler now