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[WEI] Store seed in WEI Survey to add determinism in RNG
Signed-off-by: Yohann D'ANELLO <ynerant@crans.org>
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@ -1,7 +1,7 @@
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# Copyright (C) 2018-2021 by BDE ENS Paris-Saclay
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# SPDX-License-Identifier: GPL-3.0-or-later
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from random import choice
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import time
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from random import Random
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from django import forms
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from django.db import transaction
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@ -35,7 +35,18 @@ class WEISurveyForm2021(forms.Form):
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"""
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Filter the bus selector with the buses of the current WEI.
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"""
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words = [choice(WORDS) for _ in range(10)]
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information = WEISurveyInformation2021(registration)
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if not information.seed:
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information.seed = int(1000 * time.time())
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information.save(registration)
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registration.save()
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rng = Random(information.seed)
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words = []
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for _ in range(information.step + 1):
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# Generate N times words
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words = [rng.choice(WORDS) for _ in range(10)]
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words = [(w, w) for w in words]
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if self.data:
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self.fields["word"].choices = [(w, w) for w in WORDS]
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@ -59,6 +70,8 @@ class WEISurveyInformation2021(WEISurveyInformation):
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We store the id of the selected bus. We store only the name, but is not used in the selection:
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that's only for humans that try to read data.
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"""
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# Random seed that is stored at the first time to ensure that words are generated only once
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seed = 0
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step = 0
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def __init__(self, registration):
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@ -125,5 +138,6 @@ class WEISurveyAlgorithm2021(WEISurveyAlgorithm):
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def run_algorithm(self):
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for registration in self.get_registrations():
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survey = self.get_survey_class()(registration)
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survey.select_bus(choice(Bus.objects.all()))
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rng = Random(survey.information.seed)
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survey.select_bus(rng.choice(Bus.objects.all()))
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survey.save()
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