ScoDoc/app/scodoc/sco_cache.py

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