Esempio n. 1
0
 def testZodbObjectState(self):
     state = ZodbObjectState(self.obj)
     self.assertEquals(state.listItems(), None)
     self.assertTrue(state.listAttributes()[0][0], '_SampleContainer__data')
     self.assertEquals(state.getParent(), None)
     self.assertEquals(state.getName(), None)
     self.assertTrue('_SampleContainer__data' in state.asDict().keys())
Esempio n. 2
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 def testZodbObjectState(self):
     state = ZodbObjectState(self.obj)
     self.assertEqual(state.getError(), None)
     self.assertEqual(state.listItems(), None)
     self.assertEqual(
         list(state.listAttributes())[0][0], '_SampleContainer__data')
     self.assertEqual(state.getParent(), None)
     self.assertEqual(state.getParentState(), None)
     self.assertEqual(state.getName(), None)
     self.assertTrue('_SampleContainer__data' in state.asDict().keys())
Esempio n. 3
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class ZodbInfoView(VeryCarefulView):
    """Zodb browser view"""

    template = ViewPageTemplateFile('templates/zodbinfo.pt')
    confirmation_template = ViewPageTemplateFile(
        'templates/confirm_rollback.pt')

    version = __version__
    homepage = __homepage__

    def render(self):
        self._started = time.time()
        pruneTruncations()
        self.obj = self.selectObjectToView()
        # Not using IObjectHistory(self.obj) because LP#1185175
        self.history = ZodbObjectHistory(self.obj)
        self.latest = True
        if self.request.get('tid'):
            self.state = ZodbObjectState(self.obj,
                                         p64(int(self.request['tid'], 0)),
                                         _history=self.history)
            self.latest = False
        else:
            self.state = ZodbObjectState(self.obj, _history=self.history)

        if 'CANCEL' in self.request:
            self._redirectToSelf()
            return ''

        if 'ROLLBACK' in self.request:
            rtid = p64(int(self.request['rtid'], 0))
            self.requestedState = self._tidToTimestamp(rtid)
            if self.request.get('confirmed') == '1':
                self.history.rollback(rtid)
                transaction.get().note(u'Rollback to old state %s' %
                                       self.requestedState)
                self.made_changes = True
                self._redirectToSelf()
                return ''
            # will show confirmation prompt
            return self.confirmation_template()

        return self.template()

    def renderingTime(self):
        return '%.3fs |' % (time.time() - self._started)

    def _redirectToSelf(self):
        self.request.response.redirect(self.getUrl())

    def selectObjectToView(self):
        obj = None
        if 'oid' not in self.request:
            obj = self.findClosestPersistent()
            # Sanity check: if we're running in standalone mode,
            # self.context is a Folder in the just-created MappingStorage,
            # which we're not interested in.
            if obj is not None and obj._p_jar is not self.jar:
                obj = None
        if obj is None:
            if 'oid' in self.request:
                try:
                    oid = int(self.request['oid'], 0)
                except ValueError:
                    raise UserError('OID is not an integer: %r' %
                                    self.request['oid'])
            else:
                oid = self.getRootOid()
            try:
                obj = self.jar.get(p64(oid))
            except POSKeyError:
                raise UserError('There is no object with OID 0x%x' % oid)
        return obj

    def getRequestedTid(self):
        if 'tid' in self.request:
            return self.request['tid']
        else:
            return None

    def getRequestedTidNice(self):
        if 'tid' in self.request:
            return self._tidToTimestamp(p64(int(self.request['tid'], 0)))
        else:
            return None

    def getObjectId(self):
        return self.state.getObjectId()

    def getObjectIdHex(self):
        return '0x%x' % self.state.getObjectId()

    def getObjectType(self):
        return getObjectType(self.obj)

    def getObjectTypeShort(self):
        return getObjectTypeShort(self.obj)

    def getStateTid(self):
        return u64(self.state.tid)

    def getStateTidNice(self):
        return self._tidToTimestamp(self.state.tid)

    def getPickleSize(self):
        return len(self.state.pickledState)

    def getRootOid(self):
        root = self.jar.root()
        try:
            root = root[ZopePublication.root_name]
        except KeyError:
            pass
        return u64(root._p_oid)

    def locate_json(self, path):  # AJAX view
        return json.dumps(self.locate(path))

    def truncated_ajax(self, id):  # AJAX view
        return TRUNCATIONS.get(id)

    def locate(self, path):
        not_found = object()  # marker

        # our current position
        #   partial -- path of the last _persistent_ object
        #   here -- path of the last object traversed
        #   oid -- oid of the last _persistent_ object
        #   obj -- last object traversed
        partial = here = '/'
        oid = self.getRootOid()
        obj = self.jar.get(p64(oid))

        steps = path.split('/')

        if steps and steps[0]:
            # 0x1234/sub/path -> start traversal at oid 0x1234
            try:
                oid = int(steps[0], 0)
            except ValueError:
                pass
            else:
                partial = here = hex(oid)
                try:
                    obj = self.jar.get(p64(oid))
                except KeyError:
                    oid = self.getRootOid()
                    return dict(error='Not found: %s' % steps[0],
                                partial_oid=oid,
                                partial_path='/',
                                partial_url=self.getUrl(oid))
                steps = steps[1:]

        for step in steps:
            if not step:
                continue
            if not here.endswith('/'):
                here += '/'
            here += step
            try:
                child = obj[step]
            except Exception:
                child = getattr(obj, step, not_found)
                if child is not_found:
                    return dict(error='Not found: %s' % here,
                                partial_oid=oid,
                                partial_path=partial,
                                partial_url=self.getUrl(oid))
            obj = child
            if isinstance(obj, Persistent):
                partial = here
                oid = u64(obj._p_oid)
        if not isinstance(obj, Persistent):
            return dict(error='Not persistent: %s' % here,
                        partial_oid=oid,
                        partial_path=partial,
                        partial_url=self.getUrl(oid))
        return dict(oid=oid, url=self.getUrl(oid))

    def getUrl(self, oid=None, tid=None):
        if oid is None:
            oid = self.getObjectId()
        url = "@@zodbbrowser?oid=0x%x" % oid
        if tid is None and 'tid' in self.request:
            url += "&tid=" + self.request['tid']
        elif tid is not None:
            url += "&tid=0x%x" % tid
        return url

    def getBreadcrumbs(self):
        breadcrumbs = []
        state = self.state
        seen_root = False
        while True:
            url = self.getUrl(state.getObjectId())
            if state.isRoot():
                breadcrumbs.append(('/', url))
                seen_root = True
            else:
                if breadcrumbs:
                    breadcrumbs.append(('/', None))
                if not state.getName() and state.getParentState() is None:
                    # not using hex() because we don't want L suffixes for
                    # 64-bit values
                    breadcrumbs.append(('0x%x' % state.getObjectId(), url))
                    break
                breadcrumbs.append((state.getName() or '???', url))
            state = state.getParentState()
            if state is None:
                if not seen_root:
                    url = self.getUrl(self.getRootOid())
                    breadcrumbs.append(('/', None))
                    breadcrumbs.append(('...', None))
                    breadcrumbs.append(('/', url))
                break
        return breadcrumbs[::-1]

    def getPath(self):
        return ''.join(name for name, url in self.getBreadcrumbs())

    def getBreadcrumbsHTML(self):
        html = []
        for name, url in self.getBreadcrumbs():
            if url:
                html.append('<a href="%s">%s</a>' %
                            (escape(url, True), escape(name, False)))
            else:
                html.append(escape(name, False))
        return ''.join(html)

    def listAttributes(self):
        attrs = self.state.listAttributes()
        if attrs is None:
            return None
        return [
            ZodbObjectAttribute(name, value, self.state.requestedTid)
            for name, value in sorted(attrs)
        ]

    def listItems(self):
        items = self.state.listItems()
        if items is None:
            return None
        return [
            ZodbObjectAttribute(name, value, self.state.requestedTid)
            for name, value in items
        ]

    def _loadHistoricalState(self):
        results = []
        for d in self.history:
            try:
                interp = ZodbObjectState(self.obj,
                                         d['tid'],
                                         _history=self.history)
                state = interp.asDict()
                error = interp.getError()
            except Exception as e:
                state = {}
                error = '%s: %s' % (e.__class__.__name__, e)
            results.append(dict(state=state, error=error))
        results.append(dict(state={}, error=None))
        return results

    def listHistory(self):
        """List transactions that modified a persistent object."""
        state = self._loadHistoricalState()
        results = []
        for n, d in enumerate(self.history):
            utc_timestamp = str(
                time.strftime('%Y-%m-%d %H:%M:%S', time.gmtime(d['time'])))
            local_timestamp = str(
                time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(d['time'])))
            try:
                user_location, user_id = d['user_name'].split()
            except ValueError:
                user_location = None
                user_id = d['user_name']
            url = self.getUrl(tid=u64(d['tid']))
            current = (d['tid'] == self.state.tid
                       and self.state.requestedTid is not None)
            curState = state[n]['state']
            oldState = state[n + 1]['state']
            diff = compareDictsHTML(curState, oldState, d['tid'])

            results.append(
                dict(utid=u64(d['tid']),
                     href=url,
                     current=current,
                     error=state[n]['error'],
                     diff=diff,
                     user_id=user_id,
                     user_location=user_location,
                     utc_timestamp=utc_timestamp,
                     local_timestamp=local_timestamp,
                     **d))

        # number in reverse order
        for i in range(len(results)):
            results[i]['index'] = len(results) - i

        return results

    def _tidToTimestamp(self, tid):
        if isinstance(tid, bytes) and len(tid) == 8:
            return str(TimeStamp(tid))
        return tid_repr(tid)
Esempio n. 4
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class ZodbInfoView(VeryCarefulView):
    """Zodb browser view"""

    template = ViewPageTemplateFile('templates/zodbinfo.pt')
    confirmation_template = ViewPageTemplateFile('templates/confirm_rollback.pt')

    version = __version__
    homepage = __homepage__

    def render(self):
        self._started = time.time()
        pruneTruncations()
        self.obj = self.selectObjectToView()
        # Not using IObjectHistory(self.obj) because LP#1185175
        self.history = ZodbObjectHistory(self.obj)
        self.latest = True
        if self.request.get('tid'):
            self.state = ZodbObjectState(self.obj,
                                         p64(int(self.request['tid'], 0)),
                                         _history=self.history)
            self.latest = False
        else:
            self.state = ZodbObjectState(self.obj, _history=self.history)

        if 'CANCEL' in self.request:
            self._redirectToSelf()
            return ''

        if 'ROLLBACK' in self.request:
            rtid = p64(int(self.request['rtid'], 0))
            self.requestedState = self._tidToTimestamp(rtid)
            if self.request.get('confirmed') == '1':
                self.history.rollback(rtid)
                transaction.get().note(u'Rollback to old state %s'
                                       % self.requestedState)
                self.made_changes = True
                self._redirectToSelf()
                return ''
            # will show confirmation prompt
            return self.confirmation_template()

        return self.template()

    def renderingTime(self):
        return '%.3fs |' % (time.time() - self._started)

    def _redirectToSelf(self):
        self.request.response.redirect(self.getUrl())

    def selectObjectToView(self):
        obj = None
        if 'oid' not in self.request:
            obj = self.findClosestPersistent()
            # Sanity check: if we're running in standalone mode,
            # self.context is a Folder in the just-created MappingStorage,
            # which we're not interested in.
            if obj is not None and obj._p_jar is not self.jar:
                obj = None
        if obj is None:
            if 'oid' in self.request:
                try:
                    oid = int(self.request['oid'], 0)
                except ValueError:
                    raise UserError('OID is not an integer: %r' %
                                    self.request['oid'])
            else:
                oid = self.getRootOid()
            try:
                obj = self.jar.get(p64(oid))
            except POSKeyError:
                raise UserError('There is no object with OID 0x%x' % oid)
        return obj

    def getRequestedTid(self):
        if 'tid' in self.request:
            return self.request['tid']
        else:
            return None

    def getRequestedTidNice(self):
        if 'tid' in self.request:
            return self._tidToTimestamp(p64(int(self.request['tid'], 0)))
        else:
            return None

    def getObjectId(self):
        return self.state.getObjectId()

    def getObjectIdHex(self):
        return '0x%x' % self.state.getObjectId()

    def getObjectType(self):
        return getObjectType(self.obj)

    def getObjectTypeShort(self):
        return getObjectTypeShort(self.obj)

    def getStateTid(self):
        return u64(self.state.tid)

    def getStateTidNice(self):
        return self._tidToTimestamp(self.state.tid)

    def getPickleSize(self):
        return len(self.state.pickledState)

    def getRootOid(self):
        root = self.jar.root()
        try:
            root = root[ZopePublication.root_name]
        except KeyError:
            pass
        return u64(root._p_oid)

    def locate_json(self, path): # AJAX view
        return json.dumps(self.locate(path))

    def truncated_ajax(self, id): # AJAX view
        return TRUNCATIONS.get(id)

    def locate(self, path):
        not_found = object() # marker

        # our current position
        #   partial -- path of the last _persistent_ object
        #   here -- path of the last object traversed
        #   oid -- oid of the last _persistent_ object
        #   obj -- last object traversed
        partial = here = '/'
        oid = self.getRootOid()
        obj = self.jar.get(p64(oid))

        steps = path.split('/')

        if steps and steps[0]:
            # 0x1234/sub/path -> start traversal at oid 0x1234
            try:
                oid = int(steps[0], 0)
            except ValueError:
                pass
            else:
                partial = here = hex(oid)
                try:
                    obj = self.jar.get(p64(oid))
                except KeyError:
                    oid = self.getRootOid()
                    return dict(error='Not found: %s' % steps[0],
                                partial_oid=oid,
                                partial_path='/',
                                partial_url=self.getUrl(oid))
                steps = steps[1:]

        for step in steps:
            if not step:
                continue
            if not here.endswith('/'):
                here += '/'
            here += step
            try:
                child = obj[step]
            except Exception:
                child = getattr(obj, step, not_found)
                if child is not_found:
                    return dict(error='Not found: %s' % here,
                                partial_oid=oid,
                                partial_path=partial,
                                partial_url=self.getUrl(oid))
            obj = child
            if isinstance(obj, Persistent):
                partial = here
                oid = u64(obj._p_oid)
        if not isinstance(obj, Persistent):
            return dict(error='Not persistent: %s' % here,
                        partial_oid=oid,
                        partial_path=partial,
                        partial_url=self.getUrl(oid))
        return dict(oid=oid,
                    url=self.getUrl(oid))

    def getUrl(self, oid=None, tid=None):
        if oid is None:
            oid = self.getObjectId()
        url = "@@zodbbrowser?oid=0x%x" % oid
        if tid is None and 'tid' in self.request:
            url += "&tid=" + self.request['tid']
        elif tid is not None:
            url += "&tid=0x%x" % tid
        return url

    def getBreadcrumbs(self):
        breadcrumbs = []
        state = self.state
        seen_root = False
        while True:
            url = self.getUrl(state.getObjectId())
            if state.isRoot():
                breadcrumbs.append(('/', url))
                seen_root = True
            else:
                if breadcrumbs:
                    breadcrumbs.append(('/', None))
                if not state.getName() and state.getParentState() is None:
                    # not using hex() because we don't want L suffixes for
                    # 64-bit values
                    breadcrumbs.append(('0x%x' % state.getObjectId(), url))
                    break
                breadcrumbs.append((state.getName() or '???', url))
            state = state.getParentState()
            if state is None:
                if not seen_root:
                    url = self.getUrl(self.getRootOid())
                    breadcrumbs.append(('/', None))
                    breadcrumbs.append(('...', None))
                    breadcrumbs.append(('/', url))
                break
        return breadcrumbs[::-1]

    def getPath(self):
        return ''.join(name for name, url in self.getBreadcrumbs())

    def getBreadcrumbsHTML(self):
        html = []
        for name, url in self.getBreadcrumbs():
            if url:
                html.append('<a href="%s">%s</a>' % (escape(url, True),
                                                     escape(name, False)))
            else:
                html.append(escape(name, False))
        return ''.join(html)

    def listAttributes(self):
        attrs = self.state.listAttributes()
        if attrs is None:
            return None
        return [ZodbObjectAttribute(name, value, self.state.requestedTid)
                for name, value in sorted(attrs)]

    def listItems(self):
        items = self.state.listItems()
        if items is None:
            return None
        return [ZodbObjectAttribute(name, value, self.state.requestedTid)
                for name, value in items]

    def _loadHistoricalState(self):
        results = []
        for d in self.history:
            try:
                interp = ZodbObjectState(self.obj, d['tid'],
                                         _history=self.history)
                state = interp.asDict()
                error = interp.getError()
            except Exception as e:
                state = {}
                error = '%s: %s' % (e.__class__.__name__, e)
            results.append(dict(state=state, error=error))
        results.append(dict(state={}, error=None))
        return results

    def listHistory(self):
        """List transactions that modified a persistent object."""
        state = self._loadHistoricalState()
        results = []
        for n, d in enumerate(self.history):
            utc_timestamp = str(time.strftime('%Y-%m-%d %H:%M:%S',
                                              time.gmtime(d['time'])))
            local_timestamp = str(time.strftime('%Y-%m-%d %H:%M:%S',
                                                time.localtime(d['time'])))
            try:
                user_location, user_id = d['user_name'].split()
            except ValueError:
                user_location = None
                user_id = d['user_name']
            url = self.getUrl(tid=u64(d['tid']))
            current = (d['tid'] == self.state.tid and
                       self.state.requestedTid is not None)
            curState = state[n]['state']
            oldState = state[n + 1]['state']
            diff = compareDictsHTML(curState, oldState, d['tid'])

            results.append(dict(utid=u64(d['tid']),
                                href=url, current=current,
                                error=state[n]['error'],
                                diff=diff, user_id=user_id,
                                user_location=user_location,
                                utc_timestamp=utc_timestamp,
                                local_timestamp=local_timestamp, **d))

        # number in reverse order
        for i in range(len(results)):
            results[i]['index'] = len(results) - i

        return results

    def _tidToTimestamp(self, tid):
        if isinstance(tid, bytes) and len(tid) == 8:
            return str(TimeStamp(tid))
        return tid_repr(tid)
Esempio n. 5
0
class ZodbInfoView(VeryCarefulView):
    """Zodb browser view"""

    adapts(Interface, IBrowserRequest)

    template = ViewPageTemplateFile('templates/zodbinfo.pt')
    confirmation_template = ViewPageTemplateFile('templates/confirm_rollback.pt')

    def render(self):
        self._started = time.time()
        pruneTruncations()
        self.obj = self.selectObjectToView()
        # Not using IObjectHistory(self.obj) because LP#1185175
        self.history = ZodbObjectHistory(self.obj)
        self.latest = True
        if self.request.get('tid'):
            self.state = ZodbObjectState(self.obj,
                                         p64(int(self.request['tid'], 0)),
                                         _history=self.history)
            # We display the tid only if we find one.
            self.latest = self.state.tid is None
        else:
            self.state = ZodbObjectState(self.obj, _history=self.history)

        if 'CANCEL' in self.request:
            self._redirectToSelf()
            return ''

        if 'ROLLBACK' in self.request:
            rtid = p64(int(self.request['rtid'], 0))
            self.requestedState = self._tidToTimestamp(rtid)
            if self.request.get('confirmed') == '1':
                self.history.rollback(rtid)
                transaction.get().note('Rollback to old state %s'
                                       % self.requestedState)
                self.made_changes = True
                self._redirectToSelf()
                return ''
            # will show confirmation prompt
            return self.confirmation_template()

        return self.template()

    def renderingTime(self):
        return '%.3fs |' % (time.time() - self._started)

    def _redirectToSelf(self):
        self.request.response.redirect(self.getUrl())

    def selectObjectToView(self):
        obj = None
        if 'oid' not in self.request:
            obj = self.findClosestPersistent()
            # Sanity check: if we're running in standalone mode,
            # self.context is a Folder in the just-created MappingStorage,
            # which we're not interested in.
            if obj is not None and obj._p_jar is not self.jar:
                obj = None
        if obj is None:
            if 'oid' in self.request:
                try:
                    oid = int(self.request['oid'], 0)
                except ValueError:
                    raise UserError('OID is not an integer: %r' %
                                    self.request['oid'])
            else:
                oid = self.getRootOid()
            try:
                obj = self.findObjectFromOID(oid)
            except POSKeyError:
                raise UserError('There is no object with OID 0x%x' % oid)
        return obj

    def findClosestPersistent(self):
        obj = removeSecurityProxy(self.context)
        while not isinstance(obj, Persistent):
            try:
                obj = obj.__parent__
            except AttributeError:
                return None
        return obj

    def getReferences(self):
        if self.references is None:
            return None
        return {
            'forward': map(
                self.getOIDRenderedValue,
                self.references.getForwardReferences(self.obj._p_oid)),
            'backward': map(
                self.getOIDRenderedValue,
                self.references.getBackwardReferences(self.obj._p_oid))}

    def getRequestedTid(self):
        if 'tid' in self.request:
            return self.request['tid']
        else:
            return None

    def getRequestedTidNice(self):
        if 'tid' in self.request:
            return self._tidToTimestamp(p64(int(self.request['tid'], 0)))
        else:
            return None

    def getObjectId(self):
        return self.state.getObjectId()

    def getObjectIdHex(self):
        return '0x%x' % self.state.getObjectId()

    def getObjectType(self):
        return getObjectType(self.obj)

    def getObjectTypeShort(self):
        return getObjectTypeShort(self.obj)

    def getStateTid(self):
        return u64(self.state.tid)

    def getStateTidNice(self):
        return self._tidToTimestamp(self.state.tid)

    def getPickleSize(self):
        return len(self.state.pickledState)

    def getRootOid(self):
        root = self.jar.root()
        try:
            root = root[ZopePublication.root_name]
        except KeyError:
            pass
        return u64(root._p_oid)

    def locate_json(self, path): # AJAX view
        return simplejson.dumps(self.locate(path))

    def truncated_ajax(self, id): # AJAX view
        return TRUNCATIONS.get(id)

    def locate(self, path):
        not_found = object() # marker

        # our current position
        #   partial -- path of the last _persistent_ object
        #   here -- path of the last object traversed
        #   oid -- oid of the last _persistent_ object
        #   obj -- last object traversed
        partial = here = '/'
        oid = self.getRootOid()
        obj = self.jar.get(p64(oid))

        steps = path.split('/')

        if steps and steps[0]:
            # 0x1234/sub/path -> start traversal at oid 0x1234
            try:
                oid = int(steps[0], 0)
            except ValueError:
                pass
            else:
                partial = here = hex(oid)
                try:
                    obj = self.jar.get(p64(oid))
                except KeyError:
                    oid = self.getRootOid()
                    return dict(error='Not found: %s' % steps[0],
                                partial_oid=oid,
                                partial_path='/',
                                partial_url=self.getUrl(oid))
                steps = steps[1:]

        for step in steps:
            if not step:
                continue
            if not here.endswith('/'):
                here += '/'
            here += step.encode('utf-8')
            try:
                child = obj[step]
            except Exception:
                child = getattr(obj, step, not_found)
                if child is not_found:
                    return dict(error='Not found: %s' % here,
                                partial_oid=oid,
                                partial_path=partial,
                                partial_url=self.getUrl(oid))
            obj = child
            if isinstance(obj, Persistent):
                partial = here
                oid = u64(obj._p_oid)
        if not isinstance(obj, Persistent):
            return dict(error='Not persistent: %s' % here,
                        partial_oid=oid,
                        partial_path=partial,
                        partial_url=self.getUrl(oid))
        return dict(oid=oid,
                    url=self.getUrl(oid))

    def getUrl(self, oid=None, tid=None):
        if oid is None:
            oid = self.getObjectId()
        url = "@@zodbbrowser?oid=0x%x" % oid
        if self.supportsUndo:
            if tid is None and 'tid' in self.request:
                url += "&tid=" + self.request['tid']
            elif tid is not None:
                url += "&tid=0x%x" % tid
        return url

    def getBreadcrumbs(self):
        breadcrumbs = []
        state = self.state
        seen_root = False
        while True:
            url = self.getUrl(state.getObjectId())
            if state.isRoot():
                breadcrumbs.append(('/', url))
                seen_root = True
            else:
                if breadcrumbs:
                    breadcrumbs.append(('/', None))
                if not state.getName() and state.getParentState() is None:
                    # not using hex() because we don't want L suffixes for
                    # 64-bit values
                    breadcrumbs.append(('0x%x' % state.getObjectId(), url))
                    break
                breadcrumbs.append((state.getName() or '???', url))
            state = state.getParentState()
            if state is None:
                if not seen_root:
                    url = self.getUrl(self.getRootOid())
                    breadcrumbs.append(('/', None))
                    breadcrumbs.append(('...', None))
                    breadcrumbs.append(('/', url))
                break
        return breadcrumbs[::-1]

    def getPath(self):
        return ''.join(name for name, url in self.getBreadcrumbs())

    def getBreadcrumbsHTML(self):
        html = []
        for name, url in self.getBreadcrumbs():
            if url:
                html.append('<a href="%s">%s</a>' % (escape(url, True),
                                                     escape(name)))
            else:
                html.append(escape(name))
        return ''.join(html)

    def listAttributes(self):
        attrs = self.state.listAttributes()
        if attrs is None:
            return None
        return [ZodbObjectAttribute(name, value, self.state.requestedTid)
                for name, value in sorted(attrs)]

    def listItems(self):
        items = self.state.listItems()
        if items is None:
            return None
        return [ZodbObjectAttribute(name, value, self.state.requestedTid)
                for name, value in items]

    def _loadHistoricalState(self):
        results = []
        for d in self.history:
            try:
                interp = ZodbObjectState(self.obj, d['tid'],
                                         _history=self.history)
                state = interp.asDict()
                error = interp.getError()
            except Exception, e:
                state = {}
                error = '%s: %s' % (e.__class__.__name__, e)
            results.append(dict(state=state, error=error))
        results.append(dict(state={}, error=None))
        return results