forked from ScoDoc/ScoDoc
314 lines
10 KiB
Python
314 lines
10 KiB
Python
# -*- mode: python -*-
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# -*- coding: utf-8 -*-
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##############################################################################
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#
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# Gestion scolarite IUT
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#
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# Copyright (c) 1999 - 2021 Emmanuel Viennet. All rights reserved.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#
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# Emmanuel Viennet emmanuel.viennet@viennet.net
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#
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##############################################################################
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"""Gestion des caches
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Ré-écrite pour ScoDoc8, utilise flask_caching et REDIS
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ScoDoc est maintenant multiprocessus / mono-thread, avec un cache en mémoire partagé.
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"""
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# API ScoDoc8 pour les caches:
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# sco_cache.NotesTableCache.get( formsemestre_id)
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# => sco_cache.NotesTableCache.get(formsemestre_id)
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#
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# sco_core.inval_cache(formsemestre_id=None, pdfonly=False, formsemestre_id_list=None)
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# => deprecated, NotesTableCache.invalidate_formsemestre(formsemestre_id=None, pdfonly=False)
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#
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#
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# Nouvelles fonctions:
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# sco_cache.NotesTableCache.delete(formsemestre_id)
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# sco_cache.NotesTableCache.delete_many(formsemestre_id_list)
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#
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# Bulletins PDF:
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# sco_cache.PDFBulCache.get(formsemestre_id, version)
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# sco_cache.PDFBulCache.set(formsemestre_id, version, filename, pdfdoc)
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# sco_cache.PDFBulCache.delete(formsemestre_id) suppr. toutes les versions
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# Evaluations:
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# sco_cache.EvaluationCache.get(evaluation_id), set(evaluation_id, value), delete(evaluation_id),
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#
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import time
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import traceback
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from flask import g
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from app.scodoc import notesdb as ndb
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from app.scodoc import sco_utils as scu
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from app import log
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CACHE = None # set in app.__init__.py
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class ScoDocCache:
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"""Cache for ScoDoc objects.
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keys are prefixed by the current departement.
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"""
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timeout = None # ttl, infinite by default
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prefix = ""
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@classmethod
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def _get_key(cls, oid):
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return g.scodoc_dept + "_" + cls.prefix + "_" + str(oid)
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@classmethod
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def get(cls, oid):
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"""Returns cached object, or None"""
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key = cls._get_key(oid)
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try:
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return CACHE.get(key)
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except:
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log(f"XXX CACHE Warning: error in get(key={key})")
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log(traceback.format_exc())
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return None
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@classmethod
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def set(cls, oid, value):
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"""Store value"""
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key = cls._get_key(oid)
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# log(f"CACHE key={key}, type={type(value)}, timeout={cls.timeout}")
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try:
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status = CACHE.set(key, value, timeout=cls.timeout)
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if not status:
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log("Error: cache set failed !")
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except:
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log("XXX CACHE Warning: error in set !!!")
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status = None
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return status
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@classmethod
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def delete(cls, oid):
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"""Remove from cache"""
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CACHE.delete(cls._get_key(oid))
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@classmethod
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def delete_many(cls, oids):
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"""Remove multiple keys at once"""
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# delete_many seems bugged:
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# CACHE.delete_many([cls._get_key(oid) for oid in oids])
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for oid in oids:
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cls.delete(oid)
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class EvaluationCache(ScoDocCache):
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"""Cache for evaluations.
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Clé: evaluation_id
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Valeur: { 'etudid' : note }
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"""
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prefix = "EVAL"
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@classmethod
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def invalidate_sem(cls, formsemestre_id):
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"delete evaluations in this formsemestre from cache"
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req = """SELECT e.id
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FROM notes_formsemestre s, notes_evaluation e, notes_moduleimpl m
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WHERE s.id = %(formsemestre_id)s and s.id=m.formsemestre_id and e.moduleimpl_id=m.id;
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"""
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evaluation_ids = [
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x[0] for x in ndb.SimpleQuery(req, {"formsemestre_id": formsemestre_id})
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]
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cls.delete_many(evaluation_ids)
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@classmethod
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def invalidate_all_sems(cls):
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"delete all evaluations in current dept from cache"
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evaluation_ids = [
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x[0]
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for x in ndb.SimpleQuery(
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"""SELECT e.id
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FROM notes_evaluation e, notes_moduleimpl mi, notes_formsemestre s
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WHERE s.dept_id=%(dept_id)s
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AND s.id = mi.formsemestre_id
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AND mi.id = e.moduleimpl_id;
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""",
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{"dept_id": g.scodoc_dept_id},
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)
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]
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cls.delete_many(evaluation_ids)
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class AbsSemEtudCache(ScoDocCache):
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"""Cache pour les comptes d'absences d'un étudiant dans un semestre.
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Ce cache étant indépendant des semestres, le compte peut être faux lorsqu'on
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change les dates début/fin d'un semestre.
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C'est pourquoi il expire après timeout secondes.
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Le timeout evite aussi d'éliminer explicitement ces éléments cachés lors
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des suppressions d'étudiants ou de semestres.
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Clé: etudid + "_" + date_debut + "_" + date_fin
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Valeur: (nb_abs, nb_abs_just)
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"""
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prefix = "ABSE"
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timeout = 60 * 60 # ttl 60 minutes
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class SemBulletinsPDFCache(ScoDocCache):
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"""Cache pour les classeurs de bulletins PDF d'un semestre.
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Document pdf assez volumineux. La clé inclut le type de bulletin (version).
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Clé: formsemestre_id_version
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Valeur: (filename, pdfdoc)
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"""
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prefix = "SBPDF"
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timeout = 12 * 60 * 60 # ttl 12h
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@classmethod
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def invalidate_sems(cls, formsemestre_ids):
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"""Clear cached pdf for all given formsemestres"""
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for version in scu.BULLETINS_VERSIONS:
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oids = [
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str(formsemestre_id) + "_" + version
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for formsemestre_id in formsemestre_ids
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]
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cls.delete_many(oids)
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class SemInscriptionsCache(ScoDocCache):
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"""Cache les inscriptions à un semestre.
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Clé: formsemestre_id
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Valeur: liste d'inscriptions
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[ {'formsemestre_inscription_id': 'SI78677', 'etudid': '1234', 'formsemestre_id': 'SEM012', 'etat': 'I', 'etape': ''}, ... ]
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"""
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prefix = "SI"
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duration = 12 * 60 * 60 # ttl 12h
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class NotesTableCache(ScoDocCache):
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"""Cache pour les NotesTable
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Clé: formsemestre_id
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Valeur: NotesTable instance
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"""
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prefix = "NT"
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@classmethod
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def get(cls, formsemestre_id, compute=True):
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"""Returns NotesTable for this formsemestre
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Search in local cache (g.nt_cache) or global app cache (eg REDIS)
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If not in cache and compute is True, build it and cache it.
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"""
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# try local cache (same request)
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if not hasattr(g, "nt_cache"):
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g.nt_cache = {}
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else:
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if formsemestre_id in g.nt_cache:
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return g.nt_cache[formsemestre_id]
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# try REDIS
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key = cls._get_key(formsemestre_id)
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nt = CACHE.get(key)
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if nt:
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g.nt_cache[formsemestre_id] = nt # cache locally (same request)
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return nt
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if not compute:
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return None
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# Recompute requested table:
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from app.scodoc import notes_table
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t0 = time.time()
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nt = notes_table.NotesTable(formsemestre_id)
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t1 = time.time()
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_ = cls.set(formsemestre_id, nt) # cache in REDIS
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t2 = time.time()
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log(f"cached formsemestre_id={formsemestre_id} ({(t1-t0):g}s +{(t2-t1):g}s)")
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g.nt_cache[formsemestre_id] = nt
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return nt
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def invalidate_formsemestre( # was inval_cache(formsemestre_id=None, pdfonly=False)
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formsemestre_id=None, pdfonly=False
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):
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"""expire cache pour un semestre (ou tous si formsemestre_id non spécifié).
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Si pdfonly, n'expire que les bulletins pdf cachés.
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"""
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from app.scodoc import sco_parcours_dut
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if getattr(g, "defer_cache_invalidation", False):
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g.sem_to_invalidate.add(formsemestre_id)
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return
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log("inval_cache, formsemestre_id=%s pdfonly=%s" % (formsemestre_id, pdfonly))
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if formsemestre_id is None:
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# clear all caches
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log("----- invalidate_formsemestre: clearing all caches -----")
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formsemestre_ids = [
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x[0]
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for x in ndb.SimpleQuery(
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"""SELECT id FROM notes_formsemestre s
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WHERE s.dept_id=%(dept_id)s
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""",
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{"dept_id": g.scodoc_dept_id},
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)
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]
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else:
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formsemestre_ids = [
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formsemestre_id
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] + sco_parcours_dut.list_formsemestre_utilisateurs_uecap(formsemestre_id)
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log(f"----- invalidate_formsemestre: clearing {formsemestre_ids} -----")
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if not pdfonly:
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# Delete cached notes and evaluations
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NotesTableCache.delete_many(formsemestre_ids)
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if formsemestre_id:
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for fid in formsemestre_ids:
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EvaluationCache.invalidate_sem(fid)
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if hasattr(g, "nt_cache") and fid in g.nt_cache:
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del g.nt_cache[fid]
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else:
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# optimization when we invalidate all evaluations:
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EvaluationCache.invalidate_all_sems()
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if hasattr(g, "nt_cache"):
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del g.nt_cache
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SemInscriptionsCache.delete_many(formsemestre_ids)
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SemBulletinsPDFCache.invalidate_sems(formsemestre_ids)
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class DefferedSemCacheManager:
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"""Contexte pour effectuer des opérations indépendantes dans la
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même requete qui invalident le cache. Par exemple, quand on inscrit
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des étudiants un par un à un semestre, chaque inscription va invalider
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le cache, et la suivante va le reconstruire... pour l'invalider juste après.
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Ce context manager permet de grouper les invalidations.
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"""
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def __enter__(self):
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assert not hasattr(g, "defer_cache_invalidation")
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g.defer_cache_invalidation = True
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g.sem_to_invalidate = set()
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return True
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def __exit__(self, exc_type, exc_value, exc_traceback):
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assert g.defer_cache_invalidation
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g.defer_cache_invalidation = False
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while g.sem_to_invalidate:
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formsemestre_id = g.sem_to_invalidate.pop()
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invalidate_formsemestre(formsemestre_id)
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