169 lines
7.7 KiB
Python
169 lines
7.7 KiB
Python
from django.shortcuts import render
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from datetime import datetime
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from currencies.models import (ExchangeRate,
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ExchangeRate_date,
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ExchangeRate_name)
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from currencies import exchange_rates
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from django.http import JsonResponse
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def currencies(request):
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"""this function fetches the data from swiss national bank
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evaluates if the values are already stored and
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prepares a view all dynamicaly.
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It can grow in terms of more Currencies over time automaticaly."""
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message_offline = ''
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# Namespaces
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ns = {'rdf': 'http://www.w3.org/1999/02/22-rdf-syntax-ns#',
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'none': 'http://purl.org/rss/1.0/',
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'dc': 'http://purl.org/dc/elements/1.1/',
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'dcterms': 'http://purl.org/dc/terms/',
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'cb': 'http://www.cbwiki.net/wiki/index.php/Specification_1.2/'
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}
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SNB_URL = 'https://www.snb.ch/selector/de/mmr/exfeed/rss'
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try:
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urlsocket = exchange_rates.get_rss(SNB_URL)
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except Exception as e:
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print('currencies/views.currencies() get_rss() error:', e)
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try:
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rss_tree = exchange_rates.parse_rss(urlsocket)
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except Exception as e:
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print('currencies/views.currencies() parse_rss() error:', e)
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try:
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raw_data = exchange_rates.get_exchange_rate(rss_tree, ns)
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except Exception as e:
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print('currencies/views.currencies() get_exchange_rate() error:', e)
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# because url seams to be not avalable we fetch a local file in root
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# didgeridoo/rss to get some older currencies.
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rss_tree = exchange_rates.pass_local_file()
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message_offline = """
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Are you offline? - useing stored currencies.
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This does not efect you, but your purchase prices will be
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recalculated as soon as you submit your Order. <br>
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"""
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try:
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raw_data = exchange_rates.get_exchange_rate(rss_tree, ns)
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except Exception as e:
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print("""currencies/views.currencies()
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get_exchange_rate.pass_local_file() error:""", e)
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today = datetime.now().strftime("%Y-%m-%d")
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message_no = "Already querried: "
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length_of_message_no = len(message_no)
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message_yes = " Updated successfully: "
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length_of_message_yes = len(message_yes)
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# raw_data can be empty. In this case skip:
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if raw_data:
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for one_obj_of_list in raw_data:
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for exchange_rate_of_one_day in one_obj_of_list:
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date = exchange_rate_of_one_day['date']
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currency = exchange_rate_of_one_day['currency']
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exchangerate = exchange_rate_of_one_day['exchangerate']
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# check for already existing exrates per day and add
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# to message that its already been saved.
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if ExchangeRate.objects.filter(
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date__date=date,
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name__name=currency):
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message_no += currency + ' on ' + date + ", "
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else:
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if ExchangeRate_date.objects.filter(date=date)[:1]:
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# if data and currency is not yet present, save it.
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try:
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# A: https://stackoverflow.com/a/27802801/4061870
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# lustigerweise gibt .values() den value und die id
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# zurück. Ohne .values() gibts nur den "value"
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date_dict = ExchangeRate_date.objects.filter(
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date=date).values()
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except Exception as e:
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print('currencies/views/exdate_exists \
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%s (%s) on %s'
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% (e, type(e), today))
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else:
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try:
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exdate = ExchangeRate_date.objects.create(
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date=date)
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exdate.save()
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except Exception as e:
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print('currencies/views/exdate_not_exists \
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%s (%s) for %s'
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% (e, type(e), date))
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if ExchangeRate_name.objects.filter(
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name=currency)[:1]:
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# if data and currency is not yet present, save it.
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try:
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name_dict = ExchangeRate_name.objects.filter(
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name=currency).values()
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except Exception as e:
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print('currencies/views/exname_exists \
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%s (%s) on %s'
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% (e, type(e), currency))
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else:
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try:
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exname = ExchangeRate_name.objects.create(
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name=currency)
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exname.save()
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except Exception as e:
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print('currencies/views/exname_not_exists \
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%s (%s) on %s'
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% (e, type(e), currency))
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try:
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# save item to where id's match.
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exrate = ExchangeRate.objects.create(
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# name_id=name_id,
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name_id=ExchangeRate_name.objects.get(
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name=currency).id,
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# date_id=date_id,
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date_id=ExchangeRate_date.objects.get(
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date=date).id,
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exchange_rate_to_chf=exchangerate,
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)
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exrate.save()
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message_yes += currency + ' on ' + date + ", "
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except Exception as e:
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print('currencies/views/exrate_create \
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%s (%s) on %s for %s'
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% (e, type(e), currency, date))
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# prepare messages:
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# python can not swap a char insinde a sting so i have
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# to invert and swap and then invert back:
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message_no = message_no[::-1] # invert the string
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message_no = message_no.replace(",", "!", 1) # replace first , with !
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message_no = message_no[::-1] # invert the string back
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message_yes = message_yes[::-1] # invert the string
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message_yes = message_yes.replace(",", "!", 1) # replace f. , with !
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message_yes = message_yes[::-1] # invert the string back
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# here we evaluate what kind of message is valid:
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if len(message_no) > length_of_message_no\
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and len(message_yes) > length_of_message_yes:
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message = message_offline + message_no + message_yes
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elif len(message_no) > 24:
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message = message_offline + message_no
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elif len(message_yes) > 18:
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message = message_offline + message_yes
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elif datetime.datetime.today().isoweekday() == 6:
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message = """Die Abfrage wurde ohne ergebniss beendet.
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Es ist Samstag, die SNB publiziert nur an Arbeitstagen
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neue Kurse... <br>
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"""
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elif datetime.datetime.today().isoweekday() == 7:
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message = """Die Abfrage wurde ohne ergebniss beendet.
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Es ist Sonntag, die SNB publiziert nur an Arbeitstagen
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neue Kurse... <br>
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"""
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else:
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message = """Die Abfrage wurde ohne ergebniss beendet. <br>
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"""
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# know we can query our data for presentaton:
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ordered_currency_list = ExchangeRate.objects.order_by('name', 'date')
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# and publish it on template:
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return render(request,
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'currencies/index.html',
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{'ordered_currency_list': ordered_currency_list,
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'message': message})
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