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99 lines
4.4 KiB
Python
99 lines
4.4 KiB
Python
# -*- coding: utf-8 -*-
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##############################################################################
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#
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# Copyright (c) 2009 CamptoCamp. All rights reserved.
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# @author Nicolas Bessi
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#
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# Abstract class to fetch rates from National Bank of Romania
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as
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# published by the Free Software Foundation, either version 3 of the
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# License, or (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Affero General Public License for more details.
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#
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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##############################################################################
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from .currency_getter_interface import Currency_getter_interface
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from datetime import datetime, timedelta
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import logging
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_logger = logging.getLogger(__name__)
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class RO_BNR_getter(Currency_getter_interface):
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"""Implementation of Currency_getter_factory interface for BNR service"""
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def rate_retrieve(self, dom, ns, curr):
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""" Parse a dom node to retrieve-
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currencies data"""
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res = {}
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xpath_rate_currency = "/def:DataSet/def:Body/def:Cube/def:Rate" + \
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"[@currency='%s']/text()" % (curr.upper())
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xpath_rate_ref = "/def:DataSet/def:Body/def:Cube/def:Rate" + \
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"[@currency='%s']/@multiplier" % (curr.upper())
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res['rate_currency'] = float(dom.xpath(xpath_rate_currency,
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namespaces=ns)[0])
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try:
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res['rate_ref'] = float(dom.xpath(xpath_rate_ref,
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namespaces=ns)[0])
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except:
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res['rate_ref'] = 1
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return res
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def get_updated_currency(self, currency_array, main_currency,
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max_delta_days):
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"""implementation of abstract method of Curreny_getter_interface"""
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url = 'http://www.bnr.ro/nbrfxrates.xml'
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# we do not want to update the main currency
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if main_currency in currency_array:
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currency_array.remove(main_currency)
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# Move to new XML lib cf Launchpad bug #645263
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from lxml import etree
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_logger.debug("BNR currency rate service : connecting...")
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rawfile = self.get_url(url)
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dom = etree.fromstring(rawfile)
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adminch_ns = {'def': 'http://www.bnr.ro/xsd'}
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rate_date = dom.xpath('/def:DataSet/def:Body/def:Cube/@date',
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namespaces=adminch_ns)[0]
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rate_date_datetime = datetime.strptime(rate_date, '%Y-%m-%d') + \
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timedelta(days=1)
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self.check_rate_date(rate_date_datetime, max_delta_days)
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# we dynamically update supported currencies
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self.supported_currency_array = dom.xpath(
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"/def:DataSet/def:Body/" + "def:Cube/def:Rate/@currency",
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namespaces=adminch_ns)
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self.supported_currency_array = [
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x.upper() for x in self.supported_currency_array]
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self.supported_currency_array.append('RON')
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self.validate_cur(main_currency)
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if main_currency != 'RON':
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main_curr_data = self.rate_retrieve(dom, adminch_ns, main_currency)
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# 1 MAIN_CURRENCY = main_rate RON
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main_rate = main_curr_data['rate_currency'] / \
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main_curr_data['rate_ref']
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for curr in currency_array:
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self.validate_cur(curr)
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if curr == 'RON':
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rate = main_rate
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else:
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curr_data = self.rate_retrieve(dom, adminch_ns, curr)
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# 1 MAIN_CURRENCY = rate CURR
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if main_currency == 'RON':
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rate = curr_data['rate_ref'] / curr_data['rate_currency']
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else:
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rate = main_rate * curr_data['rate_ref'] / \
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curr_data['rate_currency']
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self.updated_currency[curr] = rate
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_logger.debug("BNR Rate retrieved : 1 " + main_currency + ' = ' +
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str(rate) + ' ' + curr)
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return self.updated_currency, self.log_info
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