forked from joeli/challenge
70 lines
2.1 KiB
Python
70 lines
2.1 KiB
Python
""" Mini-Challenge"""
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from os.path import join
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from xml.etree import ElementTree as ET
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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 _read(self, name):
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with open(join(self.path, name + ".xml")) as f:
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return f.read()
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def _parse(self, xml_data):
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root = ET.fromstring(xml_data)
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token = root.find("{*}Token").text
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return token
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def _convert(self, token):
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return '{"token": %s}' % token
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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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xml_data = self._read(name)
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token = self._parse(xml_data)
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return self._convert(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 on_success(xml_data):
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try:
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token = self._parse(xml_data)
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converted = self._convert(token)
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d.callback(converted)
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except Exception as e:
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d.errback(e)
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def on_error(error):
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d.errback(error)
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deferred = defer.maybeDeferred(self._read, name)
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deferred.addCallbacks(on_success, on_error)
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return d
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