forked from joeli/challenge
77 lines
2.3 KiB
Python
77 lines
2.3 KiB
Python
""" Mini-Challenge"""
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from os.path import join
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from xml.dom import minidom
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from twisted.internet import defer
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class Adapter:
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"""Adapter class
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Aufgabe: Asynchron XML-Daten lesen, konvertieren und zurückliefern.
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"""
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def __init__(self, path):
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self.path = path
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def retrieve_token(self, name):
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"""
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Retrieve the content from file name.xml in adapters path directory
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in a synchronous way, extract the DataReceived/Token and return it
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as a JSON-Object (stringified) '{"token": value}'.
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"""
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try:
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with open(join(self.path, name + ".xml")) as f:
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xml_data = f.read()
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dom = minidom.parseString(xml_data)
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token = dom.getElementsByTagName("Token")[0].firstChild.data
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return '{"token": %s}' % token
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except Exception as e:
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raise ValueError("Could not retrieve token: %s" % e)
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def retrieve_token_async(self, name):
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"""
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Retrieve the content from file name.xml in adapters path directory
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in an asynchronous way, extract the DataReceived/Token and return it
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as a Deferred which ends up in a JSON-Object (as above).
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see: https://twistedmatrix.com/documents/8.0.0/api/twisted.internet.defer.Deferred.html
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Hint: The simple way is to use defer.succeed(), bonus points for doing
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it with a callback chain read->parse->convert.
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"""
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d = defer.Deferred()
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def read_file():
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try:
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with open(join(self.path, name + ".xml")) as f:
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xml_data = f.read()
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return xml_data
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except Exception as e:
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d.errback(e)
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def parse_xml(xml_data):
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try:
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dom = minidom.parseString(xml_data)
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token = dom.getElementsByTagName("Token")[0].firstChild.data
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return token
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except Exception as e:
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d.errback(e)
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def convert_to_json(token):
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try:
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json_string = '{"token": %s}' % token
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d.callback(json_string)
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except Exception as e:
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d.errback(e)
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defer.execute(read_file).addCallback(parse_xml).addCallback(
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convert_to_json
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).addErrback(d.errback)
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return d
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