web/httpcache.py
author Julien Cristau <julien.cristau@logilab.fr>
Mon, 06 Jul 2015 17:15:24 +0200
changeset 10489 8a2e2efe9362
parent 10411 4ee15441f2eb
child 10849 79066409fdcf
permissions -rw-r--r--
[serverctl] fix source-sync command Closes #5491700
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
8544
3d049071957e massive copyright update to avoid clutering later patches
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 8316
diff changeset
     1
# copyright 2003-2012 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
5421
8167de96c523 proper licensing information (LGPL-2.1). Hope I get it right this time.
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4436
diff changeset
     2
# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
8167de96c523 proper licensing information (LGPL-2.1). Hope I get it right this time.
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4436
diff changeset
     3
#
8167de96c523 proper licensing information (LGPL-2.1). Hope I get it right this time.
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4436
diff changeset
     4
# This file is part of CubicWeb.
8167de96c523 proper licensing information (LGPL-2.1). Hope I get it right this time.
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4436
diff changeset
     5
#
8167de96c523 proper licensing information (LGPL-2.1). Hope I get it right this time.
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4436
diff changeset
     6
# CubicWeb is free software: you can redistribute it and/or modify it under the
8167de96c523 proper licensing information (LGPL-2.1). Hope I get it right this time.
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4436
diff changeset
     7
# terms of the GNU Lesser General Public License as published by the Free
8167de96c523 proper licensing information (LGPL-2.1). Hope I get it right this time.
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4436
diff changeset
     8
# Software Foundation, either version 2.1 of the License, or (at your option)
8167de96c523 proper licensing information (LGPL-2.1). Hope I get it right this time.
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4436
diff changeset
     9
# any later version.
8167de96c523 proper licensing information (LGPL-2.1). Hope I get it right this time.
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4436
diff changeset
    10
#
5424
8ecbcbff9777 replace logilab-common by CubicWeb in disclaimer
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5421
diff changeset
    11
# CubicWeb is distributed in the hope that it will be useful, but WITHOUT
5421
8167de96c523 proper licensing information (LGPL-2.1). Hope I get it right this time.
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4436
diff changeset
    12
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
8167de96c523 proper licensing information (LGPL-2.1). Hope I get it right this time.
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4436
diff changeset
    13
# FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
8167de96c523 proper licensing information (LGPL-2.1). Hope I get it right this time.
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4436
diff changeset
    14
# details.
8167de96c523 proper licensing information (LGPL-2.1). Hope I get it right this time.
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4436
diff changeset
    15
#
8167de96c523 proper licensing information (LGPL-2.1). Hope I get it right this time.
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4436
diff changeset
    16
# You should have received a copy of the GNU Lesser General Public License along
8167de96c523 proper licensing information (LGPL-2.1). Hope I get it right this time.
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4436
diff changeset
    17
# with CubicWeb.  If not, see <http://www.gnu.org/licenses/>.
5867
7ef636d24ab2 cleanup
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5426
diff changeset
    18
"""HTTP cache managers"""
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
    19
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
    20
__docformat__ = "restructuredtext en"
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
    21
4424
5a5cd7591706 fix spurious http cache bug: sometimes last-modified headers is generated using non-english local, which ends up in a date that twisted can't parse and make it feels the page may be cached while it may not
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4423
diff changeset
    22
from time import mktime
1016
26387b836099 use datetime instead of mx.DateTime
sylvain.thenault@logilab.fr
parents: 762
diff changeset
    23
from datetime import datetime
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
    24
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
    25
class NoHTTPCacheManager(object):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
    26
    """default cache manager: set no-cache cache control policy"""
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
    27
    def __init__(self, view):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
    28
        self.view = view
3460
e4843535db25 [api] some more _cw / __regid__, automatic tests now pass again
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 3451
diff changeset
    29
        self.req = view._cw
3462
3a79fecdd2b4 [magicsearch] make tests pass again: base preprocessor must have access to vreg
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 3460
diff changeset
    30
        self.cw_rset = view.cw_rset
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
    31
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
    32
    def set_headers(self):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
    33
        self.req.set_header('Cache-control', 'no-cache')
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
    34
4424
5a5cd7591706 fix spurious http cache bug: sometimes last-modified headers is generated using non-english local, which ends up in a date that twisted can't parse and make it feels the page may be cached while it may not
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4423
diff changeset
    35
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
    36
class MaxAgeHTTPCacheManager(NoHTTPCacheManager):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
    37
    """max-age cache manager: set max-age cache control policy, with max-age
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
    38
    specified with the `cache_max_age` attribute of the view
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
    39
    """
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
    40
    def set_headers(self):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
    41
        self.req.set_header('Cache-control',
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
    42
                            'max-age=%s' % self.view.cache_max_age)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
    43
4424
5a5cd7591706 fix spurious http cache bug: sometimes last-modified headers is generated using non-english local, which ends up in a date that twisted can't parse and make it feels the page may be cached while it may not
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4423
diff changeset
    44
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
    45
class EtagHTTPCacheManager(NoHTTPCacheManager):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
    46
    """etag based cache manager for startup views
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
    47
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
    48
    * etag is generated using the view name and the user's groups
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
    49
    * set policy to 'must-revalidate' and expires to the current time to force
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
    50
      revalidation on each request
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
    51
    """
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
    52
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
    53
    def etag(self):
5244
5467674ad101 [web] put a fake object that raise Unauthorized on any attribute access as req.cnx and req._user, so we are properly asked to authenticated on any view that tries to do something with one of those attributes (instead of doing defensive programming everywhere we're doing that)
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5223
diff changeset
    54
        if not self.req.cnx: # session without established connection to the repo
5223
6abd6e3599f4 #773448: refactor session and 'no connection' handling, by introducing proper web session. We should now be able to see page even when no anon is configured, and be redirected to the login form as soon as one tries to do a query.
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 5155
diff changeset
    55
            return self.view.__regid__
3460
e4843535db25 [api] some more _cw / __regid__, automatic tests now pass again
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 3451
diff changeset
    56
        return self.view.__regid__ + '/' + ','.join(sorted(self.req.user.groups))
1802
d628defebc17 delete-trailing-whitespace + some copyright update
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 1149
diff changeset
    57
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
    58
    def max_age(self):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
    59
        # 0 to actually force revalidation
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
    60
        return 0
1802
d628defebc17 delete-trailing-whitespace + some copyright update
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 1149
diff changeset
    61
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
    62
    def last_modified(self):
4424
5a5cd7591706 fix spurious http cache bug: sometimes last-modified headers is generated using non-english local, which ends up in a date that twisted can't parse and make it feels the page may be cached while it may not
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4423
diff changeset
    63
        """return view's last modified GMT time"""
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
    64
        return self.view.last_modified()
1802
d628defebc17 delete-trailing-whitespace + some copyright update
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 1149
diff changeset
    65
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
    66
    def set_headers(self):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
    67
        req = self.req
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
    68
        try:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
    69
            req.set_header('Etag', '"%s"' % self.etag())
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
    70
        except NoEtag:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
    71
            self.req.set_header('Cache-control', 'no-cache')
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
    72
            return
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
    73
        req.set_header('Cache-control',
10348
b9bb4296133d [http] fix cache-control syntax in EtagHTTPCacheManager
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 8544
diff changeset
    74
                       'must-revalidate,max-age=%s' % self.max_age())
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
    75
        mdate = self.last_modified()
4424
5a5cd7591706 fix spurious http cache bug: sometimes last-modified headers is generated using non-english local, which ends up in a date that twisted can't parse and make it feels the page may be cached while it may not
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4423
diff changeset
    76
        # use a timestamp, not a formatted raw header, and let
5a5cd7591706 fix spurious http cache bug: sometimes last-modified headers is generated using non-english local, which ends up in a date that twisted can't parse and make it feels the page may be cached while it may not
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4423
diff changeset
    77
        # the front-end correctly generate it
5a5cd7591706 fix spurious http cache bug: sometimes last-modified headers is generated using non-english local, which ends up in a date that twisted can't parse and make it feels the page may be cached while it may not
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4423
diff changeset
    78
        # ("%a, %d %b %Y %H:%M:%S GMT" return localized date that
5a5cd7591706 fix spurious http cache bug: sometimes last-modified headers is generated using non-english local, which ends up in a date that twisted can't parse and make it feels the page may be cached while it may not
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4423
diff changeset
    79
        # twisted don't parse correctly)
5a5cd7591706 fix spurious http cache bug: sometimes last-modified headers is generated using non-english local, which ends up in a date that twisted can't parse and make it feels the page may be cached while it may not
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4423
diff changeset
    80
        req.set_header('Last-modified', mktime(mdate.timetuple()), raw=False)
5a5cd7591706 fix spurious http cache bug: sometimes last-modified headers is generated using non-english local, which ends up in a date that twisted can't parse and make it feels the page may be cached while it may not
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4423
diff changeset
    81
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
    82
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
    83
class EntityHTTPCacheManager(EtagHTTPCacheManager):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
    84
    """etag based cache manager for view displaying a single entity
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
    85
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
    86
    * etag is generated using entity's eid, the view name and the user's groups
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
    87
    * get last modified time from the entity definition (this may not be the
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
    88
      entity's modification time since a view may include some related entities
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
    89
      with a modification time to consider) using the `last_modified` method
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
    90
    """
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
    91
    def etag(self):
3451
6b46d73823f5 [api] work in progress, use __regid__, cw_*, etc.
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 1977
diff changeset
    92
        if self.cw_rset is None or len(self.cw_rset) == 0: # entity startup view for instance
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
    93
            return super(EntityHTTPCacheManager, self).etag()
3451
6b46d73823f5 [api] work in progress, use __regid__, cw_*, etc.
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 1977
diff changeset
    94
        if len(self.cw_rset) > 1:
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
    95
            raise NoEtag()
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
    96
        etag = super(EntityHTTPCacheManager, self).etag()
3451
6b46d73823f5 [api] work in progress, use __regid__, cw_*, etc.
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 1977
diff changeset
    97
        eid = self.cw_rset[0][0]
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
    98
        if self.req.user.owns(eid):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
    99
            etag += ',owners'
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   100
        return str(eid) + '/' + etag
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   101
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   102
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   103
class NoEtag(Exception):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   104
    """an etag can't be generated"""
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   105
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   106
__all__ = ('GMTOFFSET',
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   107
           'NoHTTPCacheManager', 'MaxAgeHTTPCacheManager',
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   108
           'EtagHTTPCacheManager', 'EntityHTTPCacheManager')
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   109
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   110
# monkey patching, so view doesn't depends on this module and we have all
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   111
# http cache related logic here
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   112
1149
1e19b6ef53a1 pylint cleanup
sylvain.thenault@logilab.fr
parents: 1016
diff changeset
   113
from cubicweb import view as viewmod
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   114
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   115
def set_http_cache_headers(self):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   116
    self.http_cache_manager(self).set_headers()
1149
1e19b6ef53a1 pylint cleanup
sylvain.thenault@logilab.fr
parents: 1016
diff changeset
   117
viewmod.View.set_http_cache_headers = set_http_cache_headers
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   118
4424
5a5cd7591706 fix spurious http cache bug: sometimes last-modified headers is generated using non-english local, which ends up in a date that twisted can't parse and make it feels the page may be cached while it may not
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4423
diff changeset
   119
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   120
def last_modified(self):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   121
    """return the date/time where this view should be considered as
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   122
    modified. Take care of possible related objects modifications.
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   123
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   124
    /!\ must return GMT time /!\
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   125
    """
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   126
    # XXX check view module's file modification time in dev mod ?
1016
26387b836099 use datetime instead of mx.DateTime
sylvain.thenault@logilab.fr
parents: 762
diff changeset
   127
    ctime = datetime.utcnow()
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   128
    if self.cache_max_age:
3462
3a79fecdd2b4 [magicsearch] make tests pass again: base preprocessor must have access to vreg
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 3460
diff changeset
   129
        mtime = self._cw.header_if_modified_since()
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   130
        if mtime:
1016
26387b836099 use datetime instead of mx.DateTime
sylvain.thenault@logilab.fr
parents: 762
diff changeset
   131
            tdelta = (ctime - mtime)
4423
c1850ef961fc simpler last_modified implementation
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4212
diff changeset
   132
            if tdelta.days * 24*60*60 + tdelta.seconds <= self.cache_max_age:
c1850ef961fc simpler last_modified implementation
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4212
diff changeset
   133
                return mtime
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   134
    # mtime = ctime will force page rerendering
4423
c1850ef961fc simpler last_modified implementation
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4212
diff changeset
   135
    return ctime
1149
1e19b6ef53a1 pylint cleanup
sylvain.thenault@logilab.fr
parents: 1016
diff changeset
   136
viewmod.View.last_modified = last_modified
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   137
4424
5a5cd7591706 fix spurious http cache bug: sometimes last-modified headers is generated using non-english local, which ends up in a date that twisted can't parse and make it feels the page may be cached while it may not
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4423
diff changeset
   138
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   139
# configure default caching
1149
1e19b6ef53a1 pylint cleanup
sylvain.thenault@logilab.fr
parents: 1016
diff changeset
   140
viewmod.View.http_cache_manager = NoHTTPCacheManager
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   141
# max-age=0 to actually force revalidation when needed
1149
1e19b6ef53a1 pylint cleanup
sylvain.thenault@logilab.fr
parents: 1016
diff changeset
   142
viewmod.View.cache_max_age = 0
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   143
1149
1e19b6ef53a1 pylint cleanup
sylvain.thenault@logilab.fr
parents: 1016
diff changeset
   144
viewmod.StartupView.http_cache_manager = MaxAgeHTTPCacheManager
1802
d628defebc17 delete-trailing-whitespace + some copyright update
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 1149
diff changeset
   145
viewmod.StartupView.cache_max_age = 60*60*2 # stay in http cache for 2 hours by default
8316
d5b1b75805dd [cache] factorize _validate_cache() logic implemented in wsgi and twisted handlers
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 8176
diff changeset
   146
d5b1b75805dd [cache] factorize _validate_cache() logic implemented in wsgi and twisted handlers
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 8176
diff changeset
   147
d5b1b75805dd [cache] factorize _validate_cache() logic implemented in wsgi and twisted handlers
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 8176
diff changeset
   148
### HTTP Cache validator ############################################
d5b1b75805dd [cache] factorize _validate_cache() logic implemented in wsgi and twisted handlers
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 8176
diff changeset
   149
d5b1b75805dd [cache] factorize _validate_cache() logic implemented in wsgi and twisted handlers
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 8176
diff changeset
   150
d5b1b75805dd [cache] factorize _validate_cache() logic implemented in wsgi and twisted handlers
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 8176
diff changeset
   151
d5b1b75805dd [cache] factorize _validate_cache() logic implemented in wsgi and twisted handlers
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 8176
diff changeset
   152
def get_validators(headers_in):
d5b1b75805dd [cache] factorize _validate_cache() logic implemented in wsgi and twisted handlers
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 8176
diff changeset
   153
    """return a list of http condition validator relevant to this request
d5b1b75805dd [cache] factorize _validate_cache() logic implemented in wsgi and twisted handlers
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 8176
diff changeset
   154
    """
d5b1b75805dd [cache] factorize _validate_cache() logic implemented in wsgi and twisted handlers
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 8176
diff changeset
   155
    result = []
d5b1b75805dd [cache] factorize _validate_cache() logic implemented in wsgi and twisted handlers
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 8176
diff changeset
   156
    for header, func in VALIDATORS:
d5b1b75805dd [cache] factorize _validate_cache() logic implemented in wsgi and twisted handlers
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 8176
diff changeset
   157
        value = headers_in.getHeader(header)
d5b1b75805dd [cache] factorize _validate_cache() logic implemented in wsgi and twisted handlers
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 8176
diff changeset
   158
        if value is not None:
d5b1b75805dd [cache] factorize _validate_cache() logic implemented in wsgi and twisted handlers
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 8176
diff changeset
   159
            result.append((func, value))
d5b1b75805dd [cache] factorize _validate_cache() logic implemented in wsgi and twisted handlers
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 8176
diff changeset
   160
    return result
d5b1b75805dd [cache] factorize _validate_cache() logic implemented in wsgi and twisted handlers
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 8176
diff changeset
   161
d5b1b75805dd [cache] factorize _validate_cache() logic implemented in wsgi and twisted handlers
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 8176
diff changeset
   162
d5b1b75805dd [cache] factorize _validate_cache() logic implemented in wsgi and twisted handlers
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 8176
diff changeset
   163
def if_modified_since(ref_date, headers_out):
d5b1b75805dd [cache] factorize _validate_cache() logic implemented in wsgi and twisted handlers
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 8176
diff changeset
   164
    last_modified = headers_out.getHeader('last-modified')
d5b1b75805dd [cache] factorize _validate_cache() logic implemented in wsgi and twisted handlers
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 8176
diff changeset
   165
    if last_modified is None:
d5b1b75805dd [cache] factorize _validate_cache() logic implemented in wsgi and twisted handlers
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 8176
diff changeset
   166
        return True
d5b1b75805dd [cache] factorize _validate_cache() logic implemented in wsgi and twisted handlers
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 8176
diff changeset
   167
    return ref_date < last_modified
d5b1b75805dd [cache] factorize _validate_cache() logic implemented in wsgi and twisted handlers
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 8176
diff changeset
   168
d5b1b75805dd [cache] factorize _validate_cache() logic implemented in wsgi and twisted handlers
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 8176
diff changeset
   169
def if_none_match(tags, headers_out):
d5b1b75805dd [cache] factorize _validate_cache() logic implemented in wsgi and twisted handlers
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 8176
diff changeset
   170
    etag = headers_out.getHeader('etag')
d5b1b75805dd [cache] factorize _validate_cache() logic implemented in wsgi and twisted handlers
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 8176
diff changeset
   171
    if etag is None:
d5b1b75805dd [cache] factorize _validate_cache() logic implemented in wsgi and twisted handlers
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 8176
diff changeset
   172
        return True
d5b1b75805dd [cache] factorize _validate_cache() logic implemented in wsgi and twisted handlers
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 8176
diff changeset
   173
    return not ((etag in tags) or ('*' in tags))
d5b1b75805dd [cache] factorize _validate_cache() logic implemented in wsgi and twisted handlers
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 8176
diff changeset
   174
d5b1b75805dd [cache] factorize _validate_cache() logic implemented in wsgi and twisted handlers
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 8176
diff changeset
   175
VALIDATORS = [
d5b1b75805dd [cache] factorize _validate_cache() logic implemented in wsgi and twisted handlers
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 8176
diff changeset
   176
    ('if-modified-since', if_modified_since),
d5b1b75805dd [cache] factorize _validate_cache() logic implemented in wsgi and twisted handlers
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 8176
diff changeset
   177
    #('if-unmodified-since', if_unmodified_since),
d5b1b75805dd [cache] factorize _validate_cache() logic implemented in wsgi and twisted handlers
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 8176
diff changeset
   178
    ('if-none-match', if_none_match),
d5b1b75805dd [cache] factorize _validate_cache() logic implemented in wsgi and twisted handlers
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 8176
diff changeset
   179
    #('if-modified-since', if_modified_since),
d5b1b75805dd [cache] factorize _validate_cache() logic implemented in wsgi and twisted handlers
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 8176
diff changeset
   180
]
d5b1b75805dd [cache] factorize _validate_cache() logic implemented in wsgi and twisted handlers
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 8176
diff changeset
   181