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* Google changed from an Inc to an LLC. This happened back in 2017 but we didn’t notice. Officially we should update files from Inc to LLC when they are changed as part of regular edits, but this is a nightmare to remember for the next decade. * Remove project description/titles from licenses This is no longer part of Google’s header requirements. Our existing descriptions were useless (“Visual Blocks Editor”) or grossly obselete (“Visual Blocks Language”). * License no longer requires URL. * Fix license regexps.
87 lines
2.5 KiB
Python
87 lines
2.5 KiB
Python
"""Blockly Demo: Storage
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Copyright 2012 Google LLC
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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"""
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"""Store and retrieve XML with App Engine.
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"""
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__author__ = "q.neutron@gmail.com (Quynh Neutron)"
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import cgi
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import hashlib
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from random import randint
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from google.appengine.api import memcache
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from google.appengine.ext import ndb
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def keyGen():
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# Generate a random string of length KEY_LEN.
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KEY_LEN = 6
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CHARS = "abcdefghijkmnopqrstuvwxyz23456789" # Exclude l, 0, 1.
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max_index = len(CHARS) - 1
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return "".join([CHARS[randint(0, max_index)] for x in range(KEY_LEN)])
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class Xml(ndb.Model):
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# A row in the database.
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xml_hash = ndb.IntegerProperty()
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xml_content = ndb.TextProperty()
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def xmlToKey(xml_content):
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# Store XML and return a generated key.
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xml_hash = long(hashlib.sha1(xml_content).hexdigest(), 16)
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xml_hash = int(xml_hash % (2 ** 64) - (2 ** 63))
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lookup_query = Xml.query(Xml.xml_hash == xml_hash)
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lookup_result = lookup_query.get()
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if lookup_result:
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xml_key = lookup_result.key.string_id()
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else:
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trials = 0
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result = True
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while result:
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trials += 1
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if trials == 100:
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raise Exception("Sorry, the generator failed to get a key for you.")
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xml_key = keyGen()
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result = Xml.get_by_id(xml_key)
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row = Xml(id = xml_key, xml_hash = xml_hash, xml_content = xml_content)
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row.put()
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return xml_key
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def keyToXml(key_provided):
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# Retrieve stored XML based on the provided key.
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# Normalize the string.
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key_provided = key_provided.lower().strip()
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# Check memcache for a quick match.
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xml = memcache.get("XML_" + key_provided)
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if xml is None:
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# Check datastore for a definitive match.
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result = Xml.get_by_id(key_provided)
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if not result:
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xml = ""
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else:
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xml = result.xml_content
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# Save to memcache for next hit.
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memcache.add("XML_" + key_provided, xml, 3600)
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return xml.encode("utf-8")
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if __name__ == "__main__":
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print("Content-Type: text/plain\n")
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forms = cgi.FieldStorage()
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if "xml" in forms:
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print(xmlToKey(forms["xml"].value))
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if "key" in forms:
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print(keyToXml(forms["key"].value))
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