'''
    Connections to parc web-services
'''
from _io import BytesIO
import logging
import urllib.request

from lxml import etree  # @UnresolvedImport

from core.pde import PDE_WS_URL


logger = logging.getLogger("webservice")

class GfWebservice():
    """ Parser for the pde's web service """
    def __init__(self, name):
        self._url = "{}/{}".format(PDE_WS_URL, name)
        self._data = None

    @property
    def url(self):
        return self._url

    def parse(self):
        logger.info("Request data from %s", self._url)
        self._data = urllib.request.urlopen(self._url).read()

    def __iter__(self):
        if self._data is None:
            self.parse()
        return (elt.attrib for _, elt in etree.iterparse(BytesIO(self._data)) if elt.attrib)