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Drop support for Python 2.7, 3.5, 3.6 (#32)

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78.21

/src/Products/SiteErrorLog/SiteErrorLog.py

##############################################################################
#
# Copyright (c) 2001, 2002 Zope Foundation and Contributors.
# All Rights Reserved.
#
# This software is subject to the provisions of the Zope Public License,
# Version 2.1 (ZPL).  A copy of the ZPL should accompany this distribution.
# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
# FOR A PARTICULAR PURPOSE.
#
##############################################################################
"""Site error log module.
"""

import logging
import os
import sys
import time
from _thread import allocate_lock
from random import random

from AccessControl.class_init import InitializeClass
from AccessControl.SecurityInfo import ClassSecurityInfo
from AccessControl.SecurityManagement import getSecurityManager
from AccessControl.unauthorized import Unauthorized
from Acquisition import aq_acquire
from Acquisition import aq_base
from App.Dialogs import MessageDialog
from OFS.SimpleItem import SimpleItem
from Products.PageTemplates.PageTemplateFile import PageTemplateFile
from transaction.interfaces import TransientError
from zExceptions.ExceptionFormatter import format_exception
from zope.component import adapter
from zope.event import notify
from ZPublisher.interfaces import IPubFailure

from .interfaces import ErrorRaisedEvent


LOG = logging.getLogger('Zope.SiteErrorLog')

# Permission names
use_error_logging = 'Log Site Errors'
log_to_event_log = 'Log to the Event Log'

# We want to restrict the rate at which errors are sent to the Event Log
# because we know that these errors can be generated quick enough to
# flood some zLOG backends. zLOG is used to notify someone of a problem,
# not to record every instance.
# This dictionary maps exception name to a value which encodes when we
# can next send the error with that name into the event log. This dictionary
# is shared between threads and instances. Concurrent access will not
# do much harm.
_rate_restrict_pool = {}

# The number of seconds that must elapse on average between sending two
# exceptions of the same name into the the Event Log. one per minute.
_rate_restrict_period = 60

# The number of exceptions to allow in a burst before the above limit
# kicks in. We allow five exceptions, before limiting them to one per
# minute.
_rate_restrict_burst = 5

_www = os.path.join(os.path.dirname(__file__), 'www')

# temp_logs holds the logs.
temp_logs = {}  # { oid -> [ traceback string ] }

cleanup_lock = allocate_lock()


class SiteErrorLog(SimpleItem):
    """Site error log class.  You can put an error log anywhere in the tree
    and exceptions in that area will be posted to the site error log.
    """
    meta_type = 'Site Error Log'
    id = 'error_log'
    zmi_icon = 'fas fa-bug'
    zmi_show_add_dialog = False

    keep_entries = 20
    copy_to_zlog = True

    security = ClassSecurityInfo()

    manage_options = (
        {'label': 'Log', 'action': 'manage_main'},
    ) + SimpleItem.manage_options

    security.declareProtected(use_error_logging, 'manage_main')  # NOQA: D001
    manage_main = PageTemplateFile('main.pt', _www)

    security.declareProtected(use_error_logging, 'showEntry')  # NOQA: D001
    showEntry = PageTemplateFile('showEntry.pt', _www)

    @security.private
    def manage_beforeDelete(self, item, container):
        if item is self:
            try:
                del container.__error_log__
            except AttributeError:
                pass

    @security.private
    def manage_afterAdd(self, item, container):
        if item is self:
            container.__error_log__ = aq_base(self)

    def _setId(self, id):
        if id != self.id:
            raise ValueError(MessageDialog(
                title='Invalid Id',
                message='Cannot change the id of a SiteErrorLog',
                action='./manage_main'))

    def _getLog(self):
        """Returns the log for this object.

        Careful, the log is shared between threads.
        """
        log = temp_logs.get(self._p_oid, None)
        if log is None:
            log = []
            temp_logs[self._p_oid] = log
        return log

    @security.protected(use_error_logging)
    def forgetEntry(self, id, REQUEST=None):
        """Removes an entry from the error log."""
        log = self._getLog()
        cleanup_lock.acquire()
        i = 0
        for entry in log:
            if entry['id'] == id:
                del log[i]
            i += 1
        cleanup_lock.release()
        if REQUEST is not None:
            REQUEST.RESPONSE.redirect(
                '%s/manage_main?manage_tabs_message='
                'Error+log+entry+was+removed.' %
                self.absolute_url())

    # Exceptions that happen all the time, so we dont need
    # to log them. Eventually this should be configured
    # through-the-web.
    _ignored_exceptions = ('Unauthorized', 'NotFound', 'Redirect')

    @security.private
    def raising(self, info):
        """Log an exception.

        Called by SimpleItem's exception handler.
        Returns the url to view the error log entry
        """
        now = time.time()
        try:
            tb_text = None
            tb_html = None

            strtype = str(getattr(info[0], '__name__', info[0]))
            if strtype in self._ignored_exceptions:
                return

            if not isinstance(info[2], str):
                tb_text = ''.join(
                    format_exception(*info, **{'as_html': 0}))
                tb_html = ''.join(
                    format_exception(*info, **{'as_html': 1}))
            else:
                tb_text = info[2]

            request = getattr(self, 'REQUEST', None)
            url = None
            username = None
            userid = None
            req_html = None
            try:
                strv = str(info[1])
            except Exception:
                strv = '<unprintable %s object>' % type(info[1]).__name__
            if request:
                url = request.get('URL', '?')
                usr = getSecurityManager().getUser()
                username = usr.getUserName()
                userid = usr.getId()
                try:
                    req_html = str(request)
                except Exception:
                    pass
                if strtype == 'NotFound':
                    strv = url
                    next = request['TraversalRequestNameStack']
                    if next:
                        next = list(next)
                        next.reverse()
                        strv = '{} [ /{} ]'.format(strv, '/'.join(next))

            log = self._getLog()
            entry_id = str(now) + str(random())  # Low chance of collision
            log.append({
                'type': strtype,
                'value': strv,
                'time': now,
                'id': entry_id,
                'tb_text': tb_text,
                'tb_html': tb_html,
                'username': username,
                'userid': userid,
                'url': url,
                'req_html': req_html})

            cleanup_lock.acquire()
            try:
                if len(log) >= self.keep_entries:
                    del log[:-self.keep_entries]
            finally:
                cleanup_lock.release()
        except Exception:
            LOG.error('Error while logging', exc_info=sys.exc_info())
        else:
            notify(ErrorRaisedEvent(log[-1]))
            if self.copy_to_zlog:
                self._do_copy_to_zlog(now, strtype, entry_id,
                                      str(url), tb_text)
            return f'{self.absolute_url()}/showEntry?id={entry_id}'

    def _do_copy_to_zlog(self, now, strtype, entry_id, url, tb_text):
        when = _rate_restrict_pool.get(strtype, 0)
        if now > when:
            next_when = max(when,
                            now - _rate_restrict_burst * _rate_restrict_period)
            next_when += _rate_restrict_period
            _rate_restrict_pool[strtype] = next_when
            LOG.error(f'{entry_id} {url}\n{tb_text.rstrip()}')

    @security.protected(use_error_logging)
    def getProperties(self):
        return {
            'keep_entries': self.keep_entries,
            'copy_to_zlog': self.copy_to_zlog,
            'ignored_exceptions': self._ignored_exceptions,
        }

    @security.protected(log_to_event_log)
    def checkEventLogPermission(self):
        if not getSecurityManager().checkPermission(log_to_event_log, self):
            raise Unauthorized('You do not have the "%s" permission.' %
                               log_to_event_log)
        return 1

    @security.protected(use_error_logging)
    def setProperties(self, keep_entries, copy_to_zlog=0,
                      ignored_exceptions=(), RESPONSE=None):
        """Sets the properties of this site error log.
        """
        copy_to_zlog = not not copy_to_zlog
        if copy_to_zlog and not self.copy_to_zlog:
            # Before turning on event logging, check the permission.
            self.checkEventLogPermission()
        self.keep_entries = int(keep_entries)
        self.copy_to_zlog = copy_to_zlog
        # filter out empty lines
        # ensure we don't save exception objects but exceptions instead
        self._ignored_exceptions = tuple(
            [_f for _f in map(str, ignored_exceptions) if _f])
        if RESPONSE is not None:
            RESPONSE.redirect(
                '%s/manage_main?manage_tabs_message=Changed+properties.' %
                self.absolute_url())

    @security.protected(use_error_logging)
    def getLogEntries(self):
        """Returns the entries in the log, most recent first.

        Makes a copy to prevent changes.
        """
        # List incomprehension ;-)
        res = [entry.copy() for entry in self._getLog()]
        res.reverse()
        return res

    @security.protected(use_error_logging)
    def getLogEntryById(self, id):
        """Returns the specified log entry.

        Makes a copy to prevent changes.  Returns None if not found.
        """
        for entry in self._getLog():
            if entry['id'] == id:
                return entry.copy()
        return None

    @security.protected(use_error_logging)
    def getLogEntryAsText(self, id, RESPONSE=None):
        """Returns the specified log entry.

        Makes a copy to prevent changes.  Returns None if not found.
        """
        entry = self.getLogEntryById(id)
        if entry is None:
            return 'Log entry not found or expired'
        if RESPONSE is not None:
            RESPONSE.setHeader('Content-Type', 'text/plain')
        return entry['tb_text']


InitializeClass(SiteErrorLog)


def manage_addErrorLog(dispatcher, RESPONSE=None):
    """Add a site error log to a container."""
    log = SiteErrorLog()
    dispatcher._setObject(log.id, log)
    if RESPONSE is not None:
        RESPONSE.redirect(
            dispatcher.DestinationURL()
            + '/manage_main?manage_tabs_message=Error+Log+Added.')


@adapter(IPubFailure)
def IPubFailureSubscriber(event):
    """ Handles an IPubFailure event triggered by the WSGI Publisher.
        This handler forwards the event to the SiteErrorLog object
        closest to the published object that the error occured with,
        it logs no error if no published object was found.
    """
    request = event.request
    published = request.get('PUBLISHED')

    if published is None:  # likely a traversal problem
        parents = request.get('PARENTS')
        if parents:
            # partially emulate successful traversal
            published = request['PUBLISHED'] = parents.pop(0)
    if published is None:
        return

    published = getattr(published, '__self__', published)  # method --> object

    # Filter out transient errors like ConflictErrors that can be
    # retried, just log a short message instead.
    if isinstance(event.exc_info[1], TransientError) and \
       request.supports_retry():
        LOG.info('{} at {}: {}. Request will be retried.'.format(
                 event.exc_info[0].__name__,
                 request.get('PATH_INFO') or '<unknown>',
                 str(event.exc_info[1])))
        return

    try:
        error_log = aq_acquire(published, '__error_log__', containment=1)
    except AttributeError:
        pass
    else:
        error_log.raising(event.exc_info)

1	##############################################################################
2	#
3	# Copyright (c) 2001, 2002 Zope Foundation and Contributors.
4	# All Rights Reserved.
5	#
6	# This software is subject to the provisions of the Zope Public License,
7	# Version 2.1 (ZPL). A copy of the ZPL should accompany this distribution.
8	# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
9	# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
10	# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
11	# FOR A PARTICULAR PURPOSE.
12	#
13	##############################################################################
14	"""Site error log module.	1✔
15	"""
16
17	import logging	1✔
18	import os	1✔
19	import sys	1✔
20	import time	1✔
21	from _thread import allocate_lock	1✔
22	from random import random	1✔
23
24	from AccessControl.class_init import InitializeClass	1✔
25	from AccessControl.SecurityInfo import ClassSecurityInfo	1✔
26	from AccessControl.SecurityManagement import getSecurityManager	1✔
27	from AccessControl.unauthorized import Unauthorized	1✔
28	from Acquisition import aq_acquire	1✔
29	from Acquisition import aq_base	1✔
30	from App.Dialogs import MessageDialog	1✔
31	from OFS.SimpleItem import SimpleItem	1✔
32	from Products.PageTemplates.PageTemplateFile import PageTemplateFile	1✔
33	from transaction.interfaces import TransientError	1✔
34	from zExceptions.ExceptionFormatter import format_exception	1✔
35	from zope.component import adapter	1✔
36	from zope.event import notify	1✔
37	from ZPublisher.interfaces import IPubFailure	1✔
38
39	from .interfaces import ErrorRaisedEvent	1✔
40
41
42	LOG = logging.getLogger('Zope.SiteErrorLog')	1✔
43
44	# Permission names
45	use_error_logging = 'Log Site Errors'	1✔
46	log_to_event_log = 'Log to the Event Log'	1✔
47
48	# We want to restrict the rate at which errors are sent to the Event Log
49	# because we know that these errors can be generated quick enough to
50	# flood some zLOG backends. zLOG is used to notify someone of a problem,
51	# not to record every instance.
52	# This dictionary maps exception name to a value which encodes when we
53	# can next send the error with that name into the event log. This dictionary
54	# is shared between threads and instances. Concurrent access will not
55	# do much harm.
56	_rate_restrict_pool = {}	1✔
57
58	# The number of seconds that must elapse on average between sending two
59	# exceptions of the same name into the the Event Log. one per minute.
60	_rate_restrict_period = 60	1✔
61
62	# The number of exceptions to allow in a burst before the above limit
63	# kicks in. We allow five exceptions, before limiting them to one per
64	# minute.
65	_rate_restrict_burst = 5	1✔
66
67	_www = os.path.join(os.path.dirname(__file__), 'www')	1✔
68
69	# temp_logs holds the logs.
70	temp_logs = {} # { oid -> [ traceback string ] }	1✔
71
72	cleanup_lock = allocate_lock()	1✔
73
74
75	class SiteErrorLog(SimpleItem):	1✔
76	"""Site error log class. You can put an error log anywhere in the tree
77	and exceptions in that area will be posted to the site error log.
78	"""
79	meta_type = 'Site Error Log'	1✔
80	id = 'error_log'	1✔
81	zmi_icon = 'fas fa-bug'	1✔
82	zmi_show_add_dialog = False	1✔
83
84	keep_entries = 20	1✔
85	copy_to_zlog = True	1✔
86
87	security = ClassSecurityInfo()	1✔
88
89	manage_options = (	1✔
90	{'label': 'Log', 'action': 'manage_main'},
91	) + SimpleItem.manage_options
92
93	security.declareProtected(use_error_logging, 'manage_main') # NOQA: D001	1✔
94	manage_main = PageTemplateFile('main.pt', _www)	1✔
95
96	security.declareProtected(use_error_logging, 'showEntry') # NOQA: D001	1✔
97	showEntry = PageTemplateFile('showEntry.pt', _www)	1✔
98
99	@security.private	1✔
100	def manage_beforeDelete(self, item, container):	1✔
101	if item is self:	1!
102	try:	1✔
103	del container.__error_log__	1✔
104	except AttributeError:	×
105	pass	×
106
107	@security.private	1✔
108	def manage_afterAdd(self, item, container):	1✔
109	if item is self:	1!
110	container.__error_log__ = aq_base(self)	1✔
111
112	def _setId(self, id):	1✔
113	if id != self.id:	×
114	raise ValueError(MessageDialog(	×
115	title='Invalid Id',
116	message='Cannot change the id of a SiteErrorLog',
117	action='./manage_main'))
118
119	def _getLog(self):	1✔
120	"""Returns the log for this object.
121
122	Careful, the log is shared between threads.
123	"""
124	log = temp_logs.get(self._p_oid, None)	1✔
125	if log is None:	1✔
126	log = []	1✔
127	temp_logs[self._p_oid] = log	1✔
128	return log	1✔
129
130	@security.protected(use_error_logging)	1✔
131	def forgetEntry(self, id, REQUEST=None):	1✔
132	"""Removes an entry from the error log."""
133	log = self._getLog()	1✔
134	cleanup_lock.acquire()	1✔
135	i = 0	1✔
136	for entry in log:	1✔
137	if entry['id'] == id:	1✔
138	del log[i]	1✔
139	i += 1	1✔
140	cleanup_lock.release()	1✔
141	if REQUEST is not None:	1!
142	REQUEST.RESPONSE.redirect(	×
143	'%s/manage_main?manage_tabs_message='
144	'Error+log+entry+was+removed.' %
145	self.absolute_url())
146
147	# Exceptions that happen all the time, so we dont need
148	# to log them. Eventually this should be configured
149	# through-the-web.
150	_ignored_exceptions = ('Unauthorized', 'NotFound', 'Redirect')	1✔
151
152	@security.private	1✔
153	def raising(self, info):	1✔
154	"""Log an exception.
155
156	Called by SimpleItem's exception handler.
157	Returns the url to view the error log entry
158	"""
159	now = time.time()	1✔
160	try:	1✔
161	tb_text = None	1✔
162	tb_html = None	1✔
163
164	strtype = str(getattr(info[0], '__name__', info[0]))	1✔
165	if strtype in self._ignored_exceptions:	1✔
166	return	1✔
167
168	if not isinstance(info[2], str):	1!
169	tb_text = ''.join(	1✔
170	format_exception(info, *{'as_html': 0}))
171	tb_html = ''.join(	1✔
172	format_exception(info, *{'as_html': 1}))
173	else:
174	tb_text = info[2]	×
175
176	request = getattr(self, 'REQUEST', None)	1✔
177	url = None	1✔
178	username = None	1✔
179	userid = None	1✔
180	req_html = None	1✔
181	try:	1✔
182	strv = str(info[1])	1✔
183	except Exception:	×
184	strv = '<unprintable %s object>' % type(info[1]).__name__	×
185	if request:	1!
186	url = request.get('URL', '?')	1✔
187	usr = getSecurityManager().getUser()	1✔
188	username = usr.getUserName()	1✔
189	userid = usr.getId()	1✔
190	try:	1✔
191	req_html = str(request)	1✔
192	except Exception:	×
193	pass	×
194	if strtype == 'NotFound':	1✔
195	strv = url	1✔
196	next = request['TraversalRequestNameStack']	1✔
197	if next:	1!
198	next = list(next)	×
199	next.reverse()	×
200	strv = '{} [ /{} ]'.format(strv, '/'.join(next))	×
201
202	log = self._getLog()	1✔
203	entry_id = str(now) + str(random()) # Low chance of collision	1✔
204	log.append({	1✔
205	'type': strtype,
206	'value': strv,
207	'time': now,
208	'id': entry_id,
209	'tb_text': tb_text,
210	'tb_html': tb_html,
211	'username': username,
212	'userid': userid,
213	'url': url,
214	'req_html': req_html})
215
216	cleanup_lock.acquire()	1✔
217	try:	1✔
218	if len(log) >= self.keep_entries:	1!
219	del log[:-self.keep_entries]	×
220	finally:
221	cleanup_lock.release()	1✔
222	except Exception:	×
223	LOG.error('Error while logging', exc_info=sys.exc_info())	×
224	else:
225	notify(ErrorRaisedEvent(log[-1]))	1✔
226	if self.copy_to_zlog:	1!
227	self._do_copy_to_zlog(now, strtype, entry_id,	1✔
228	str(url), tb_text)
229	return f'{self.absolute_url()}/showEntry?id={entry_id}'	1✔
230
231	def _do_copy_to_zlog(self, now, strtype, entry_id, url, tb_text):	1✔
232	when = _rate_restrict_pool.get(strtype, 0)	1✔
233	if now > when:	1!
234	next_when = max(when,	1✔
235	now - _rate_restrict_burst * _rate_restrict_period)
236	next_when += _rate_restrict_period	1✔
237	_rate_restrict_pool[strtype] = next_when	1✔
238	LOG.error(f'{entry_id} {url}\n{tb_text.rstrip()}')	1✔
239
240	@security.protected(use_error_logging)	1✔
241	def getProperties(self):	1✔
242	return {	1✔
243	'keep_entries': self.keep_entries,
244	'copy_to_zlog': self.copy_to_zlog,
245	'ignored_exceptions': self._ignored_exceptions,
246	}
247
248	@security.protected(log_to_event_log)	1✔
249	def checkEventLogPermission(self):	1✔
250	if not getSecurityManager().checkPermission(log_to_event_log, self):	1!
251	raise Unauthorized('You do not have the "%s" permission.' %	×
252	log_to_event_log)
253	return 1	1✔
254
255	@security.protected(use_error_logging)	1✔
256	def setProperties(self, keep_entries, copy_to_zlog=0,	1✔
257	ignored_exceptions=(), RESPONSE=None):
258	"""Sets the properties of this site error log.
259	"""
260	copy_to_zlog = not not copy_to_zlog	1✔
261	if copy_to_zlog and not self.copy_to_zlog:	1!
262	# Before turning on event logging, check the permission.
263	self.checkEventLogPermission()	×
264	self.keep_entries = int(keep_entries)	1✔
265	self.copy_to_zlog = copy_to_zlog	1✔
266	# filter out empty lines
267	# ensure we don't save exception objects but exceptions instead
268	self._ignored_exceptions = tuple(	1✔
269	[_f for _f in map(str, ignored_exceptions) if _f])
270	if RESPONSE is not None:	1✔
271	RESPONSE.redirect(	1✔
272	'%s/manage_main?manage_tabs_message=Changed+properties.' %
273	self.absolute_url())
274
275	@security.protected(use_error_logging)	1✔
276	def getLogEntries(self):	1✔
277	"""Returns the entries in the log, most recent first.
278
279	Makes a copy to prevent changes.
280	"""
281	# List incomprehension ;-)
282	res = [entry.copy() for entry in self._getLog()]	1✔
283	res.reverse()	1✔
284	return res	1✔
285
286	@security.protected(use_error_logging)	1✔
287	def getLogEntryById(self, id):	1✔
288	"""Returns the specified log entry.
289
290	Makes a copy to prevent changes. Returns None if not found.
291	"""
292	for entry in self._getLog():	×
293	if entry['id'] == id:	×
294	return entry.copy()	×
295	return None	×
296
297	@security.protected(use_error_logging)	1✔
298	def getLogEntryAsText(self, id, RESPONSE=None):	1✔
299	"""Returns the specified log entry.
300
301	Makes a copy to prevent changes. Returns None if not found.
302	"""
303	entry = self.getLogEntryById(id)	×
304	if entry is None:	×
305	return 'Log entry not found or expired'	×
306	if RESPONSE is not None:	×
307	RESPONSE.setHeader('Content-Type', 'text/plain')	×
308	return entry['tb_text']	×
309
310
311	InitializeClass(SiteErrorLog)	1✔
312
313
314	def manage_addErrorLog(dispatcher, RESPONSE=None):	1✔
315	"""Add a site error log to a container."""
316	log = SiteErrorLog()	1✔
317	dispatcher._setObject(log.id, log)	1✔
318	if RESPONSE is not None:	1!
319	RESPONSE.redirect(	×
320	dispatcher.DestinationURL()
321	+ '/manage_main?manage_tabs_message=Error+Log+Added.')
322
323
324	@adapter(IPubFailure)	1✔
325	def IPubFailureSubscriber(event):	1✔
326	""" Handles an IPubFailure event triggered by the WSGI Publisher.
327	This handler forwards the event to the SiteErrorLog object
328	closest to the published object that the error occured with,
329	it logs no error if no published object was found.
330	"""
331	request = event.request	1✔
332	published = request.get('PUBLISHED')	1✔
333
334	if published is None: # likely a traversal problem	1✔
335	parents = request.get('PARENTS')	1✔
336	if parents:	1!
337	# partially emulate successful traversal
338	published = request['PUBLISHED'] = parents.pop(0)	1✔
339	if published is None:	1!
340	return	×
341
342	published = getattr(published, '__self__', published) # method --> object	1✔
343
344	# Filter out transient errors like ConflictErrors that can be
345	# retried, just log a short message instead.
346	if isinstance(event.exc_info[1], TransientError) and \	1✔
347	request.supports_retry():
348	LOG.info('{} at {}: {}. Request will be retried.'.format(	1✔
349	event.exc_info[0].__name__,
350	request.get('PATH_INFO') or '<unknown>',
351	str(event.exc_info[1])))
352	return	1✔
353
354	try:	1✔
355	error_log = aq_acquire(published, '__error_log__', containment=1)	1✔
356	except AttributeError:	×
357	pass	×
358	else:
359	error_log.raising(event.exc_info)	1✔

zopefoundation / Products.SiteErrorLog / 4063246703

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