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Collection: change collections to be an extension of items

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Each collection now has an item and the item's UID is the collections
UID. This lets us manipulate collections just like items, and as part of
transactions. This is significant because it lets us change them as part
of transactions!
This commit is contained in:
Tom Hacohen 2020-06-23 12:55:28 +03:00
parent 37bae63a46
commit 267d749c45
5 changed files with 72 additions and 56 deletions
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31
django_etebase/migrations/0016_auto_20200623_0820.py Normal file
View File

@ -0,0 +1,31 @@
# Generated by Django 3.0.3 on 2020-06-23 08:20
from django.db import migrations, models
import django.db.models.deletion
class Migration(migrations.Migration):
dependencies = [
('django_etebase', '0015_collectionitemrevision_salt'),
]
operations = [
migrations.AddField(
model_name='collection',
name='main_item',
field=models.ForeignKey(null=True, on_delete=django.db.models.deletion.PROTECT, related_name='parent', to='django_etebase.CollectionItem'),
),
migrations.AlterUniqueTogether(
name='collection',
unique_together=set(),
),
migrations.RemoveField(
model_name='collection',
name='uid',
),
migrations.RemoveField(
model_name='collection',
name='version',
),
]

11
django_etebase/models.py
View File

@ -27,20 +27,15 @@ UidValidator = RegexValidator(regex=r'^[a-zA-Z0-9]*$', message='Not a valid UID'
class Collection(models.Model):
uid = models.CharField(db_index=True, blank=False, null=False,
max_length=43, validators=[UidValidator])
version = models.PositiveSmallIntegerField()
main_item = models.ForeignKey('CollectionItem', related_name='parent', null=True, on_delete=models.SET_NULL)
owner = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE)
class Meta:
unique_together = ('uid', 'owner')
def __str__(self):
return self.uid
@cached_property
def main_item(self):
return self.items.get(uid=None)
def uid(self):
return self.main_item.uid
@property
def content(self):

6
django_etebase/permissions.py
View File

@ -31,7 +31,7 @@ class IsCollectionAdmin(permissions.BasePermission):
def has_permission(self, request, view):
collection_uid = view.kwargs['collection_uid']
try:
collection = view.get_collection_queryset().get(uid=collection_uid)
collection = view.get_collection_queryset().get(main_item__uid=collection_uid)
return is_collection_admin(collection, request.user)
except Collection.DoesNotExist:
# If the collection does not exist, we want to 404 later, not permission denied.
@ -53,7 +53,7 @@ class IsCollectionAdminOrReadOnly(permissions.BasePermission):
return True
try:
collection = view.get_collection_queryset().get(uid=collection_uid)
collection = view.get_collection_queryset().get(main_item__uid=collection_uid)
if request.method in permissions.SAFE_METHODS:
return True
@ -73,7 +73,7 @@ class HasWriteAccessOrReadOnly(permissions.BasePermission):
def has_permission(self, request, view):
collection_uid = view.kwargs['collection_uid']
try:
collection = view.get_collection_queryset().get(uid=collection_uid)
collection = view.get_collection_queryset().get(main_item__uid=collection_uid)
if request.method in permissions.SAFE_METHODS:
return True
else:

43
django_etebase/serializers.py
View File

@ -182,15 +182,19 @@ class CollectionItemBulkGetSerializer(serializers.ModelSerializer):
class CollectionSerializer(serializers.ModelSerializer):
encryptionKey = CollectionEncryptionKeyField()
collectionKey = CollectionEncryptionKeyField()
accessLevel = serializers.SerializerMethodField('get_access_level_from_context')
stoken = serializers.CharField(read_only=True)
uid = serializers.CharField(source='main_item.uid')
encryptionKey = BinaryBase64Field(source='main_item.encryptionKey')
etag = serializers.CharField(allow_null=True, write_only=True)
content = CollectionItemRevisionSerializer(many=False)
version = serializers.IntegerField(min_value=0, source='main_item.version')
content = CollectionItemRevisionSerializer(many=False, source='main_item.content')
class Meta:
model = models.Collection
fields = ('uid', 'version', 'accessLevel', 'encryptionKey', 'content', 'stoken', 'etag')
fields = ('uid', 'version', 'accessLevel', 'encryptionKey', 'collectionKey', 'content', 'stoken', 'etag')
def get_access_level_from_context(self, obj):
request = self.context.get('request', None)
@ -200,9 +204,16 @@ class CollectionSerializer(serializers.ModelSerializer):
def create(self, validated_data):
"""Function that's called when this serializer creates an item"""
collection_key = validated_data.pop('collectionKey')
etag = validated_data.pop('etag')
revision_data = validated_data.pop('content')
encryption_key = validated_data.pop('encryptionKey')
main_item_data = validated_data.pop('main_item')
uid = main_item_data.pop('uid')
version = main_item_data.pop('version')
revision_data = main_item_data.pop('content')
encryption_key = main_item_data.pop('encryptionKey')
instance = self.__class__.Meta.model(**validated_data)
with transaction.atomic():
@ -211,7 +222,10 @@ class CollectionSerializer(serializers.ModelSerializer):
instance.save()
main_item = models.CollectionItem.objects.create(
uid=None, encryptionKey=None, version=instance.version, collection=instance)
uid=uid, encryptionKey=encryption_key, version=version, collection=instance)
instance.main_item = main_item
instance.save()
process_revisions_for_item(main_item, revision_data)
@ -219,26 +233,13 @@ class CollectionSerializer(serializers.ModelSerializer):
stoken=models.Stoken.objects.create(),
user=validated_data.get('owner'),
accessLevel=models.AccessLevels.ADMIN,
encryptionKey=encryption_key,
encryptionKey=collection_key,
).save()
return instance
def update(self, instance, validated_data):
"""Function that's called when this serializer is meant to update an item"""
revision_data = validated_data.pop('content')
with transaction.atomic():
main_item = instance.main_item
# We don't have to use select_for_update here because the unique constraint on current guards against
# the race condition. But it's a good idea because it'll lock and wait rather than fail.
current_revision = main_item.revisions.filter(current=True).select_for_update().first()
current_revision.current = None
current_revision.save()
process_revisions_for_item(main_item, revision_data)
return instance
raise NotImplementedError()
class CollectionMemberSerializer(serializers.ModelSerializer):

37
django_etebase/views.py
View File

@ -147,11 +147,12 @@ class BaseViewSet(viewsets.ModelViewSet):
class CollectionViewSet(BaseViewSet):
allowed_methods = ['GET', 'POST', 'DELETE']
allowed_methods = ['GET', 'POST']
permission_classes = BaseViewSet.permission_classes + (permissions.IsCollectionAdminOrReadOnly, )
queryset = Collection.objects.all()
serializer_class = CollectionSerializer
lookup_field = 'uid'
lookup_field = 'main_item__uid'
lookup_url_kwarg = 'uid'
stoken_id_fields = ['items__revisions__stoken__id', 'members__stoken__id']
def get_queryset(self, queryset=None):
@ -173,19 +174,7 @@ class CollectionViewSet(BaseViewSet):
return Response(status=status.HTTP_405_METHOD_NOT_ALLOWED)
def update(self, request, *args, **kwargs):
instance = self.get_object()
stoken = request.GET.get('stoken', None)
if stoken is not None and stoken != instance.stoken:
content = {'code': 'stale_stoken', 'detail': 'Stoken is too old'}
return Response(content, status=status.HTTP_400_BAD_REQUEST)
serializer = self.get_serializer(instance, data=request.data)
serializer.is_valid(raise_exception=True)
self.perform_update(serializer)
return Response({})
return Response(status=status.HTTP_405_METHOD_NOT_ALLOWED)
def create(self, request, *args, **kwargs):
serializer = self.get_serializer(data=request.data)
@ -216,7 +205,7 @@ class CollectionViewSet(BaseViewSet):
if stoken_obj is not None:
# FIXME: honour limit? (the limit should be combined for data and this because of stoken)
remed = CollectionMemberRemoved.objects.filter(user=request.user, stoken__id__gt=stoken_obj.id) \
.values_list('collection__uid', flat=True)
.values_list('collection__main_item__uid', flat=True)
if len(remed) > 0:
ret['removedMemberships'] = [{'uid': x} for x in remed]
@ -234,7 +223,7 @@ class CollectionItemViewSet(BaseViewSet):
def get_queryset(self):
collection_uid = self.kwargs['collection_uid']
try:
collection = self.get_collection_queryset(Collection.objects).get(uid=collection_uid)
collection = self.get_collection_queryset(Collection.objects).get(main_item__uid=collection_uid)
except Collection.DoesNotExist:
raise Http404("Collection does not exist")
# XXX Potentially add this for performance: .prefetch_related('revisions__chunks')
@ -280,7 +269,7 @@ class CollectionItemViewSet(BaseViewSet):
@action_decorator(detail=True, methods=['GET'])
def revision(self, request, collection_uid=None, uid=None):
# FIXME: need pagination support
col = get_object_or_404(self.get_collection_queryset(Collection.objects), uid=collection_uid)
col = get_object_or_404(self.get_collection_queryset(Collection.objects), main_item__uid=collection_uid)
col_it = get_object_or_404(col.items, uid=uid)
serializer = CollectionItemRevisionSerializer(col_it.revisions.order_by('-id'), many=True)
@ -336,7 +325,7 @@ class CollectionItemViewSet(BaseViewSet):
with transaction.atomic(): # We need this for locking on the collection object
collection_object = get_object_or_404(
self.get_collection_queryset(Collection.objects).select_for_update(), # Lock writes on the collection
uid=collection_uid)
main_item__uid=collection_uid)
if stoken is not None and stoken != collection_object.stoken:
content = {'code': 'stale_stoken', 'detail': 'Stoken is too old'}
@ -388,7 +377,7 @@ class CollectionItemChunkViewSet(viewsets.ViewSet):
return queryset.filter(members__user=user)
def create(self, request, collection_uid=None, collection_item_uid=None):
col = get_object_or_404(self.get_collection_queryset(), uid=collection_uid)
col = get_object_or_404(self.get_collection_queryset(), main_item__uid=collection_uid)
col_it = get_object_or_404(col.items, uid=collection_item_uid)
serializer = self.get_serializer_class()(data=request.data)
@ -408,7 +397,7 @@ class CollectionItemChunkViewSet(viewsets.ViewSet):
import os
from django.views.static import serve
col = get_object_or_404(self.get_collection_queryset(), uid=collection_uid)
col = get_object_or_404(self.get_collection_queryset(), main_item__uid=collection_uid)
col_it = get_object_or_404(col.items, uid=collection_item_uid)
chunk = get_object_or_404(col_it.chunks, uid=uid)
@ -436,7 +425,7 @@ class CollectionMemberViewSet(BaseViewSet):
def get_queryset(self, queryset=None):
collection_uid = self.kwargs['collection_uid']
try:
collection = self.get_collection_queryset(Collection.objects).get(uid=collection_uid)
collection = self.get_collection_queryset(Collection.objects).get(main_item__uid=collection_uid)
except Collection.DoesNotExist:
raise Http404('Collection does not exist')
@ -478,7 +467,7 @@ class CollectionMemberViewSet(BaseViewSet):
@action_decorator(detail=False, methods=['POST'], permission_classes=our_base_permission_classes)
def leave(self, request, collection_uid=None):
collection_uid = self.kwargs['collection_uid']
col = get_object_or_404(self.get_collection_queryset(Collection.objects), uid=collection_uid)
col = get_object_or_404(self.get_collection_queryset(Collection.objects), main_item__uid=collection_uid)
member = col.members.get(user=request.user)
self.perform_destroy(member)
@ -534,7 +523,7 @@ class InvitationOutgoingViewSet(InvitationBaseViewSet):
collection_uid = serializer.validated_data.get('collection', {}).get('uid')
try:
collection = self.get_collection_queryset(Collection.objects).get(uid=collection_uid)
collection = self.get_collection_queryset(Collection.objects).get(main_item__uid=collection_uid)
except Collection.DoesNotExist:
raise Http404('Collection does not exist')