def update_graph(self, metadata):
"""Get the new metadata and store them in the graph as properties"""
session = get_graph_session()
gq_coll = gq_get_vertex_collection(self)
# old_meta stores the metadata present in the graph before updating
old_meta = self.get_graph_metadata()
# new_meta stores the set of final metadata we want
new_meta = metadata
old_meta_keys = set(old_meta.keys())
new_meta_keys = set(new_meta.keys())
# Delete metadata present in old but not in new
for meta_to_delete in old_meta_keys.difference(new_meta_keys):
session.execute_graph("""{}.properties('{}').drop()""".format(
gq_coll, meta_to_delete))
# Update metadata present in both old and new (check if value changed ?)
for meta_to_update in old_meta_keys.intersection(new_meta_keys):
session.execute_graph("""{}.property('{}', '{}')""".format(
gq_coll, meta_to_update, new_meta[meta_to_update]))
# Add metadata present in new but not in old
for meta_to_add in new_meta_keys.difference(old_meta_keys):
session.execute_graph("""{}.property('{}', '{}')""".format(
gq_coll, meta_to_add, new_meta[meta_to_add]))
def delete(self, username=None):
"""Delete a collection and the associated row in the tree entry table"""
from indigo.models import Notification
if self.is_root:
return
cfg = get_config(None)
session = connection.get_session()
keyspace = cfg.get('KEYSPACE', 'indigo')
session.set_keyspace(keyspace)
query = SimpleStatement(
"""DELETE FROM tree_entry WHERE container=%s""")
session.execute(query, (self.path, ))
# Get the row that describe the collection as a child of its parent
child = TreeEntry.objects.filter(container=self.container,
name=u"{}/".format(
self.name)).first()
if child:
child.delete()
session = get_graph_session()
session.execute_graph("""v_coll = {}.drop();
""".format(gq_get_vertex_collection(self)))
state = self.mqtt_get_state()
payload = self.mqtt_payload(state, {})
Notification.delete_collection(username, self.path, payload)
self.reset()
def check_graph_root(cls):
"""Return True if the root vertex does exist"""
root = Collection.find("/")
session = get_graph_session()
query = gq_get_vertex_collection(root)
rset = session.execute_graph("v_root = {};".format(query))
try:
root = next(rset.current_rows)
return True
except StopIteration:
return False
def create(cls,
container,
name,
uuid=None,
metadata=None,
url=None,
mimetype=None,
username=None,
size=None):
"""Create a new resource in the tree_entry table"""
from indigo.models import Collection
from indigo.models import Notification
# Check if parent collection exists
parent = Collection.find(container)
if parent is None:
raise NoSuchCollectionError(container)
if uuid is None:
uuid = default_cdmi_id()
create_ts = datetime.now()
modified_ts = create_ts
path = merge(container, name)
if metadata:
metadata_cass = meta_cdmi_to_cassandra(metadata)
# Check the container exists
collection = Collection.find(container)
if not collection:
raise NoSuchCollectionError(container)
# Make sure parent/name are not in use.
existing = cls.find(path)
if existing:
raise ResourceConflictError(path)
kwargs = {
"container": container,
"name": name,
"url": url,
"uuid": uuid,
}
if is_reference(url):
kwargs["create_ts"] = create_ts
kwargs["modified_ts"] = modified_ts
kwargs["mimetype"] = mimetype
if metadata:
kwargs["metadata"] = metadata_cass
else:
obj_id = url.replace("cassandra://", "")
data_obj = DataObject.find(obj_id)
if metadata:
data_obj.update(mimetype=mimetype, metadata=metadata_cass)
else:
if mimetype:
data_obj.update(mimetype=mimetype)
if size:
data_obj.update(size=size)
data_entry = TreeEntry.create(**kwargs)
new = Resource(data_entry)
session = get_graph_session()
add_user_edge = ""
if username:
user = User.find(username)
if user:
add_user_edge = """v_user = {}.next();
v_user.addEdge('owns', v_new);
""".format(gq_get_vertex_user(user))
else:
add_user_edge = ""
session.execute_graph("""v_parent = {}.next();
v_new = {};
v_parent.addEdge('son', v_new);
{}
""".format(gq_get_vertex_collection(parent),
gq_add_vertex_resource(new),
add_user_edge))
if metadata:
new.update_graph(metadata)
state = new.mqtt_get_state()
payload = new.mqtt_payload({}, state)
Notification.create_resource(username, path, payload)
# Index the resource
new.index()
return new
def create(cls, name, container='/', metadata=None, username=None):
"""Create a new collection"""
from indigo.models import Notification
from indigo.models import Resource
path = merge(container, name)
# Check if parent collection exists
parent = Collection.find(container)
if parent is None:
raise NoSuchCollectionError(container)
resource = Resource.find(merge(container, name))
if resource is not None:
raise ResourceConflictError(container)
collection = Collection.find(path)
if collection is not None:
raise CollectionConflictError(container)
now = datetime.now()
# If we try to create a tree entry with no metadata, cassandra-driver
# will fail as it tries to delete a static column
if metadata:
metadata_cass = meta_cdmi_to_cassandra(metadata)
coll_entry = TreeEntry.create(container=path,
name='.',
container_create_ts=now,
container_modified_ts=now,
container_metadata=metadata_cass)
else:
coll_entry = TreeEntry.create(container=path,
name='.',
container_create_ts=now,
container_modified_ts=now)
coll_entry.update(uuid=coll_entry.container_uuid)
child_entry = TreeEntry.create(container=container,
name=name + '/',
uuid=coll_entry.container_uuid)
new = Collection.find(path)
add_user_edge = ""
if username:
user = User.find(username)
if user:
add_user_edge = """v_user = {}.next();
v_user.addEdge('owns', v_new);
""".format(gq_get_vertex_user(user))
else:
add_user_edge = ""
session = get_graph_session()
session.execute_graph("""v_parent = {}.next();
v_new = {};
v_parent.addEdge('son', v_new);
{}
""".format(gq_get_vertex_collection(parent),
gq_add_vertex_collection(new),
add_user_edge))
if metadata:
new.update_graph(metadata)
state = new.mqtt_get_state()
payload = new.mqtt_payload({}, state)
Notification.create_collection(username, path, payload)
# Index the collection
new.index()
return new