class DatastoreMongoStub(apiproxy_stub.APIProxyStub):
"""Persistent stub for the Python datastore API, using MongoDB to persist.
A DatastoreMongoStub instance handles a single app's data.
"""
_NO_TRANSACTION_WARNING_LOGGED = False
def __init__(self,
app_id,
datastore_file,
history_file,
require_indexes=False,
service_name='datastore_v3',
auto_increment_ids=True):
"""Constructor.
Initializes the datastore stub.
Args:
app_id: string
datastore_file: ignored
history_file: ignored
require_indexes: bool, default False. If True, composite indexes must
exist in index.yaml for queries that need them.
service_name: Service name expected for all calls.
auto_increment_ids: Use incrementing integer IDs for new entities.
"""
super(DatastoreMongoStub, self).__init__(service_name)
assert isinstance(app_id, basestring) and app_id != ''
self.__app_id = app_id
self.__require_indexes = require_indexes
self.__auto_increment_ids = auto_increment_ids
# TODO should be a way to configure the connection
self.__db = Connection()[app_id]
# Setup the intid client
if auto_increment_ids:
self.intid = IntidClient()
else:
self.intid = None
# NOTE our query history gets reset each time the server restarts...
# should this be fixed?
self.__query_history = {}
self.__next_index_id = 1
self.__indexes = {}
self.__index_lock = threading.Lock()
self.__cursor_lock = threading.Lock()
self.__next_cursor = 1
self.__queries = {}
def MakeSyncCall(self, service, call, request, response):
""" The main RPC entry point. service must be 'datastore_v3'. So far, the
supported calls are 'Get', 'Put', 'RunQuery', 'Next', and 'Count'.
"""
super(DatastoreMongoStub, self).MakeSyncCall(service,
call,
request,
response)
explanation = []
assert response.IsInitialized(explanation), explanation
def QueryHistory(self):
"""Returns a dict that maps Query PBs to times they've been run.
"""
return dict((pb, times) for pb, times in self.__query_history.items()
if pb.app() == self.__app_id)
def __collection_for_key(self, key):
return key.path().element(-1).type()
def __id_for_key(self, key):
db_path = []
def add_element_to_db_path(elem):
db_path.append(elem.type())
if elem.has_name():
db_path.append(elem.name())
else:
db_path.append("\t" + str(elem.id()))
for elem in key.path().element_list():
add_element_to_db_path(elem)
return "\10".join(db_path)
def __key_for_id(self, id):
def from_db(value):
if value.startswith("\t"):
return int(value[1:])
return value
return datastore_types.Key.from_path(*[from_db(a) for a in id.split("\10")])
def __create_mongo_value_for_value(self, value):
if isinstance(value, datastore_types.Rating):
return {
'class': 'rating',
'rating': int(value),
}
if isinstance(value, datastore_types.Category):
return {
'class': 'category',
'category': str(value),
}
if isinstance(value, datastore_types.Key):
return {
'class': 'key',
'path': self.__id_for_key(value._ToPb()),
}
if isinstance(value, types.ListType):
list_for_db = [self.__create_mongo_value_for_value(v) for v in value]
sorted_list = sorted(value)
return {
'class': 'list',
'list': list_for_db,
'ascending_sort_key': self.__create_mongo_value_for_value(sorted_list[0]),
'descending_sort_key': self.__create_mongo_value_for_value(sorted_list[-1]),
}
if isinstance(value, users.User):
return {
'class': 'user',
'email': value.email(),
}
if isinstance(value, datastore_types.Text):
return {
'class': 'text',
'string': unicode(value),
}
if isinstance(value, datastore_types.Blob):
return Binary(value)
if isinstance(value, datastore_types.ByteString):
return {
'class': 'bytes',
'value': Binary(value)
}
if isinstance(value, datastore_types.IM):
return {
'class': 'im',
'protocol': value.protocol,
'address': value.address,
}
if isinstance(value, datastore_types.GeoPt):
return {
'class': 'geopt',
'lat': value.lat,
'lon': value.lon,
}
if isinstance(value, datastore_types.Email):
return {
'class': 'email',
'value': value,
}
return value
def __create_value_for_mongo_value(self, mongo_value):
if isinstance(mongo_value, Binary):
return datastore_types.Blob(str(mongo_value))
if isinstance(mongo_value, types.DictType):
if mongo_value['class'] == 'rating':
return datastore_types.Rating(int(mongo_value["rating"]))
if mongo_value['class'] == 'category':
return datastore_types.Category(mongo_value["category"])
if mongo_value['class'] == 'key':
return self.__key_for_id(mongo_value['path'])
if mongo_value['class'] == 'list':
return [self.__create_value_for_mongo_value(v) for v in mongo_value['list']]
if mongo_value['class'] == 'user':
return users.User(email=mongo_value["email"])
if mongo_value['class'] == 'text':
return datastore_types.Text(mongo_value['string'])
if mongo_value['class'] == 'im':
return datastore_types.IM(mongo_value['protocol'], mongo_value['address'])
if mongo_value['class'] == 'geopt':
return datastore_types.GeoPt(mongo_value['lat'], mongo_value['lon'])
if mongo_value['class'] == 'email':
return datastore_types.Email(mongo_value['value'])
if mongo_value['class'] == 'bytes':
return datastore_types.ByteString(mongo_value['value'])
return mongo_value
def __mongo_document_for_entity(self, entity):
document = {}
document["_id"] = self.__id_for_key(entity.key())
entity = datastore.Entity._FromPb(entity)
for (k, v) in entity.iteritems():
v = self.__create_mongo_value_for_value(v)
document[k] = v
return document
def __entity_for_mongo_document(self, document):
key = self.__key_for_id(document.pop("_id"))
entity = datastore.Entity(kind=key.kind(), parent=key.parent(), name=key.name())
for k in document.keys():
v = self.__create_value_for_mongo_value(document[k])
entity[k] = v
pb = entity._ToPb()
# no decent way to initialize an Entity w/ an existing key...
if not key.name():
pb.key().path().element_list()[-1].set_id(key.id())
return pb
def _Dynamic_Put(self, put_request, put_response):
for entity in put_request.entity_list():
clone = entity_pb.EntityProto()
clone.CopyFrom(entity)
assert clone.has_key()
assert clone.key().path().element_size() > 0
last_path = clone.key().path().element_list()[-1]
if last_path.id() == 0 and not last_path.has_name():
if self.__auto_increment_ids:
last_path.set_id(self.intid.get())
else:
last_path.set_id(random.randint(-sys.maxint-1, sys.maxint))
assert clone.entity_group().element_size() == 0
group = clone.mutable_entity_group()
root = clone.key().path().element(0)
group.add_element().CopyFrom(root)
else:
assert (clone.has_entity_group() and
clone.entity_group().element_size() > 0)
collection = self.__collection_for_key(clone.key())
document = self.__mongo_document_for_entity(clone)
id = self.__db[collection].save(document)
put_response.key_list().append(self.__key_for_id(id)._ToPb())
def _Dynamic_Get(self, get_request, get_response):
for key in get_request.key_list():
collection = self.__collection_for_key(key)
id = self.__id_for_key(key)
group = get_response.add_entity()
document = self.__db[collection].find_one({"_id": id})
if document is None:
entity = None
else:
entity = self.__entity_for_mongo_document(document)
if entity:
group.mutable_entity().CopyFrom(entity)
def _Dynamic_Delete(self, delete_request, delete_response):
for key in delete_request.key_list():
collection = self.__collection_for_key(key)
id = self.__id_for_key(key)
self.__db[collection].remove({"_id": id})
def __special_props(self, value, direction):
if isinstance(value, datastore_types.Category):
return ["category"]
if isinstance(value, datastore_types.GeoPt):
return ["lat", "lon"]
if isinstance(value, list):
if direction == pymongo.ASCENDING:
return ["ascending_sort_key"]
return ["descending_sort_key"]
return None
def __unorderable(self, value):
if isinstance(value, datastore_types.Text):
return True
if isinstance(value, datastore_types.Blob):
return True
return False
def __translate_order_for_mongo(self, order_list, prototype):
mongo_ordering = []
for o in order_list:
key = o.property().decode('utf-8')
value = pymongo.ASCENDING
if o.direction() is datastore_pb.Query_Order.DESCENDING:
value = pymongo.DESCENDING
if key == "__key__":
key = "_id"
mongo_ordering.append((key, value))
continue
if key not in prototype or self.__unorderable(prototype[key]):
return None
props = self.__special_props(prototype[key], value)
if props:
for prop in props:
mongo_ordering.append((key + "." + prop, value))
else:
mongo_ordering.append((key, value))
return mongo_ordering
def __filter_suffix(self, value):
if isinstance(value, types.ListType):
return ".list"
return ""
def __filter_binding(self, key, value, operation, prototype):
if key in prototype:
key += self.__filter_suffix(prototype[key])
if key == "__key__":
key = "_id"
value = self.__id_for_key(value._ToPb())
else:
value = self.__create_mongo_value_for_value(value)
if operation == "<":
return (key, {'$lt': value})
elif operation == '<=':
return (key, {'$lte': value})
elif operation == '>':
return (key, {'$gt': value})
elif operation == '>=':
return (key, {'$gte': value})
elif operation == '==':
return (key, value)
raise apiproxy_errors.ApplicationError(
datastore_pb.Error.BAD_REQUEST, "Can't handle operation %r." % operation)
def _Dynamic_RunQuery(self, query, query_result):
if query.has_offset() and query.offset() > _MAX_QUERY_OFFSET:
raise apiproxy_errors.ApplicationError(
datastore_pb.Error.BAD_REQUEST, 'Too big query offset.')
num_components = len(query.filter_list()) + len(query.order_list())
if query.has_ancestor():
num_components += 1
if num_components > _MAX_QUERY_COMPONENTS:
raise apiproxy_errors.ApplicationError(
datastore_pb.Error.BAD_REQUEST,
('query is too large. may not have more than %s filters'
' + sort orders ancestor total' % _MAX_QUERY_COMPONENTS))
app = query.app()
query_result.mutable_cursor().set_cursor(0)
query_result.set_more_results(False)
if self.__require_indexes:
required, kind, ancestor, props, num_eq_filters = datastore_index.CompositeIndexForQuery(query)
if required:
index = entity_pb.CompositeIndex()
index.mutable_definition().set_entity_type(kind)
index.mutable_definition().set_ancestor(ancestor)
for (k, v) in props:
p = index.mutable_definition().add_property()
p.set_name(k)
p.set_direction(v)
if props and not self.__has_index(index):
raise apiproxy_errors.ApplicationError(
datastore_pb.Error.NEED_INDEX,
"This query requires a composite index that is not defined. "
"You must update the index.yaml file in your application root.")
collection = query.kind()
clone = datastore_pb.Query()
clone.CopyFrom(query)
clone.clear_hint()
if clone in self.__query_history:
self.__query_history[clone] += 1
else:
self.__query_history[clone] = 1
# HACK we need to get one Entity from this collection so we know what the
# property types are (because we need to construct queries that depend on
# the types of the properties)...
prototype = self.__db[collection].find_one()
if prototype is None:
return
prototype = datastore.Entity._FromPb(self.__entity_for_mongo_document(prototype))
spec = {}
if query.has_ancestor():
spec["_id"] = re.compile("^%s.*$" % self.__id_for_key(query.ancestor()))
operators = {datastore_pb.Query_Filter.LESS_THAN: '<',
datastore_pb.Query_Filter.LESS_THAN_OR_EQUAL: '<=',
datastore_pb.Query_Filter.GREATER_THAN: '>',
datastore_pb.Query_Filter.GREATER_THAN_OR_EQUAL: '>=',
datastore_pb.Query_Filter.EQUAL: '==',
}
for filt in query.filter_list():
assert filt.op() != datastore_pb.Query_Filter.IN
prop = filt.property(0).name().decode('utf-8')
op = operators[filt.op()]
filter_val_list = [datastore_types.FromPropertyPb(filter_prop)
for filter_prop in filt.property_list()]
(key, value) = self.__filter_binding(prop, filter_val_list[0], op, prototype)
if key in spec:
if not isinstance(spec[key], types.DictType) and not isinstance(value, types.DictType):
if spec[key] != value:
return
elif not isinstance(spec[key], types.DictType):
value["$in"] = [spec[key]]
spec[key] = value
elif not isinstance(value, types.DictType):
spec[key]["$in"] = [value]
else:
spec[key].update(value)
else:
spec[key] = value
cursor = self.__db[collection].find(spec)
order = self.__translate_order_for_mongo(query.order_list(), prototype)
if order is None:
return
if order:
cursor = cursor.sort(order)
if query.has_offset():
cursor = cursor.skip(query.offset())
if query.has_limit():
cursor = cursor.limit(query.limit())
self.__cursor_lock.acquire()
cursor_index = self.__next_cursor
self.__next_cursor += 1
self.__cursor_lock.release()
self.__queries[cursor_index] = cursor
query_result.mutable_cursor().set_cursor(cursor_index)
query_result.set_more_results(True)
def _Dynamic_Next(self, next_request, query_result):
cursor = next_request.cursor().cursor()
query_result.set_more_results(False)
if cursor == 0: # we exited early from the query w/ no results...
return
try:
cursor = self.__queries[cursor]
except KeyError:
raise apiproxy_errors.ApplicationError(datastore_pb.Error.BAD_REQUEST,
'Cursor %d not found' % cursor)
count = next_request.count()
for _ in range(count):
try:
query_result.result_list().append(self.__entity_for_mongo_document(cursor.next()))
except StopIteration:
return
query_result.set_more_results(True)
def _Dynamic_Count(self, query, integer64proto):
query_result = datastore_pb.QueryResult()
self._Dynamic_RunQuery(query, query_result)
cursor_number = query_result.cursor().cursor()
if cursor_number == 0: # we exited early from the query w/ no results...
integer64proto.set_value(0)
else:
cursor = self.__queries[cursor_number]
count = cursor.count()
del self.__queries[cursor_number]
if query.has_limit() and count > query.limit():
count = query.limit()
integer64proto.set_value(count)
def _Dynamic_BeginTransaction(self, request, transaction):
transaction.set_handle(0)
if not self._NO_TRANSACTION_WARNING_LOGGED:
logging.log(logging.WARN, 'transactions unsupported')
self._NO_TRANSACTION_WARNING_LOGGED = True
def _Dynamic_Commit(self, transaction, transaction_response):
if not self._NO_TRANSACTION_WARNING_LOGGED:
logging.log(logging.WARN, 'transactions unsupported')
self._NO_TRANSACTION_WARNING_LOGGED = True
def _Dynamic_Rollback(self, transaction, transaction_response):
if not self._NO_TRANSACTION_WARNING_LOGGED:
logging.log(logging.WARN, 'transactions unsupported')
self._NO_TRANSACTION_WARNING_LOGGED = True
def _Dynamic_GetSchema(self, app_str, schema):
# TODO this is used for the admin viewer to introspect.
pass
def __collection_and_spec_for_index(self, index):
def translate_name(ae_name):
if ae_name == "__key__":
return "_id"
return ae_name
def translate_direction(ae_dir):
if ae_dir == 1:
return pymongo.ASCENDING
elif ae_dir == 2:
return pymongo.DESCENDING
raise apiproxy_errors.ApplicationError(datastore_pb.Error.BAD_REQUEST,
'Weird direction.')
collection = index.definition().entity_type()
spec = []
for prop in index.definition().property_list():
spec.append((translate_name(prop.name()), translate_direction(prop.direction())))
return (collection, spec)
def _Dynamic_AllocateIds(self, allocate_ids_request, allocate_ids_response):
model_key = allocate_ids_request.model_key()
size = allocate_ids_request.size()
start = self.intid.get()
for i in xrange(size-1):
self.intid.get()
end = self.intid.get()
allocate_ids_response.set_start(start)
allocate_ids_response.set_end(end)
def __has_index(self, index):
(collection, spec) = self.__collection_and_spec_for_index(index)
if self.__db[collection]._gen_index_name(spec) in self.__db[collection].index_information().keys():
return True
return False
def _Dynamic_CreateIndex(self, index, id_response):
if index.id() != 0:
raise apiproxy_errors.ApplicationError(datastore_pb.Error.BAD_REQUEST,
'New index id must be 0.')
elif self.__has_index(index):
logging.getLogger().info(index)
raise apiproxy_errors.ApplicationError(datastore_pb.Error.BAD_REQUEST,
'Index already exists.')
(collection, spec) = self.__collection_and_spec_for_index(index)
if spec: # otherwise it's probably an index w/ just an ancestor specifier
self.__db[collection].create_index(spec)
if self.__db.error():
raise apiproxy_errors.ApplicationError(datastore_pb.Error.BAD_REQUEST,
"Error creating index. Maybe too many indexes?")
# NOTE just give it a dummy id. we don't use these for anything...
id_response.set_value(1)
def _Dynamic_GetIndices(self, app_str, composite_indices):
if app_str.value() != self.__db.name():
raise apiproxy_errors.ApplicationError(datastore_pb.Error.BAD_REQUEST,
"Getting indexes for a different app unsupported.")
def from_index_name(name):
elements = name.split("_")
index = []
while len(elements):
if not elements[0]:
elements = elements[1:]
elements[0] = "_" + elements[0]
index.append((elements[0], int(elements[1])))
elements = elements[2:]
return index
for collection in self.__db.collection_names():
info = self.__db[collection].index_information()
for index in info.keys():
index_pb = entity_pb.CompositeIndex()
index_pb.set_app_id(self.__db.name())
index_pb.mutable_definition().set_entity_type(collection)
index_pb.mutable_definition().set_ancestor(False)
index_pb.set_state(2) # READ_WRITE
index_pb.set_id(1) # bogus id
for (k, v) in from_index_name(index):
if k == "_id":
k = "__key__"
p = index_pb.mutable_definition().add_property()
p.set_name(k)
p.set_direction(v == pymongo.ASCENDING and 1 or 2)
composite_indices.index_list().append(index_pb)
def _Dynamic_UpdateIndex(self, index, void):
logging.log(logging.WARN, 'update index unsupported')
def _Dynamic_DeleteIndex(self, index, void):
(collection, spec) = self.__collection_and_spec_for_index(index)
if not spec:
return
if not self.__has_index(index):
raise apiproxy_errors.ApplicationError(datastore_pb.Error.BAD_REQUEST,
"Index doesn't exist.")
self.__db[collection].drop_index(spec)
class DatastoreMongoStub(apiproxy_stub.APIProxyStub):
"""Persistent stub for the Python datastore API, using MongoDB to persist.
A DatastoreMongoStub instance handles a single app's data.
"""
def __init__(self,
app_id,
datastore_file=None,
require_indexes=False,
service_name='datastore_v3'):
"""Constructor.
Initializes the datastore stub.
Args:
app_id: string
datastore_file: ignored
require_indexes: bool, default False. If True, composite indexes must
exist in index.yaml for queries that need them.
service_name: Service name expected for all calls.
"""
super(DatastoreMongoStub, self).__init__(service_name)
assert isinstance(app_id, basestring) and app_id != ''
self.__app_id = app_id
self.__require_indexes = require_indexes
self.__trusted = True
# TODO should be a way to configure the connection
self.__db = Connection()[app_id]
# NOTE our query history gets reset each time the server restarts...
# should this be fixed?
self.__query_history = {}
self.__next_index_id = 1
self.__indexes = {}
self.__index_lock = threading.Lock()
self.__cursor_lock = threading.Lock()
self.__next_cursor = 1
self.__queries = {}
self.__id_lock = threading.Lock()
self.__id_map = {}
# Transaction support
self.__next_tx_handle = 1
self.__tx_writes = {}
self.__tx_deletes = set()
self.__tx_actions = []
self.__tx_lock = threading.Lock()
def Clear(self):
"""Clears the datastore.
This is mainly for testing purposes and the admin console.
"""
for name in self.__db.collection_names():
if not name.startswith('system.'):
self.__db.drop_collection(name)
self.__queries = {}
self.__query_history = {}
self.__indexes = {}
self.__id_map = {}
self.__next_tx_handle = 1
self.__tx_writes = {}
self.__tx_deletes = set()
self.__tx_actions = []
self.__db.datastore.drop()
def MakeSyncCall(self, service, call, request, response):
""" The main RPC entry point. service must be 'datastore_v3'.
So far, the supported calls are 'Get', 'Put', 'Delete', 'RunQuery', 'Next',
and 'AllocateIds'.
"""
self.AssertPbIsInitialized(request)
super(DatastoreMongoStub, self).MakeSyncCall(
service, call, request, response)
self.AssertPbIsInitialized(response)
def AssertPbIsInitialized(self, pb):
"""Raises an exception if the given PB is not initialized and valid."""
explanation = []
assert pb.IsInitialized(explanation), explanation
pb.Encode()
def QueryHistory(self):
"""Returns a dict that maps Query PBs to times they've been run."""
return dict((pb, times) for pb, times in self.__query_history.items()
if pb.app() == self.__app_id)
def __collection_for_key(self, key):
collection = key.path().element(-1).type()
if key.has_name_space():
collection = key.name_space() + _NAMESPACE_CONCAT_STR + collection
return collection
def __id_for_key(self, key):
db_path = []
def add_element_to_db_path(elem):
db_path.append(elem.type())
if elem.has_name():
db_path.append(elem.name())
else:
db_path.append("\t" + str(elem.id()).zfill(10))
for elem in key.path().element_list():
add_element_to_db_path(elem)
return "\10".join(db_path)
def __key_for_id(self, id):
def from_db(value):
if value.startswith("\t"):
return int(value[1:])
return value
return datastore_types.Key.from_path(*[from_db(a) for a in id.split("\10")])
def __create_mongo_value_for_value(self, value):
if isinstance(value, datastore_types.Rating):
return {
'class': 'rating',
'rating': int(value),
}
if isinstance(value, datastore_types.Category):
return {
'class': 'category',
'category': str(value),
}
if isinstance(value, datastore_types.Key):
return {
'class': 'key',
'path': self.__id_for_key(value._ToPb()),
}
if isinstance(value, types.ListType):
list_for_db = [self.__create_mongo_value_for_value(v) for v in value]
sorted_list = sorted(value)
return {
'class': 'list',
'list': list_for_db,
'ascending_sort_key': self.__create_mongo_value_for_value(
sorted_list[0]),
'descending_sort_key': self.__create_mongo_value_for_value(
sorted_list[-1]),
}
if isinstance(value, users.User):
return {
'class': 'user',
'email': value.email(),
}
if isinstance(value, datastore_types.Text):
return {
'class': 'text',
'string': unicode(value),
}
if isinstance(value, datastore_types.Blob):
return Binary(value)
if isinstance(value, datastore_types.ByteString):
return {
'class': 'bytes',
'value': Binary(value)
}
if isinstance(value, datastore_types.IM):
return {
'class': 'im',
'protocol': value.protocol,
'address': value.address,
}
if isinstance(value, datastore_types.GeoPt):
return {
'class': 'geopt',
'lat': value.lat,
'lon': value.lon,
}
if isinstance(value, datastore_types.Email):
return {
'class': 'email',
'value': value,
}
if isinstance(value, datastore_types.BlobKey):
return {
'class': 'blobkey',
'value': str(value),
}
return value
def __create_value_for_mongo_value(self, mongo_value):
if isinstance(mongo_value, Binary):
return datastore_types.Blob(str(mongo_value))
if isinstance(mongo_value, types.DictType):
if mongo_value['class'] == 'rating':
return datastore_types.Rating(int(mongo_value["rating"]))
if mongo_value['class'] == 'category':
return datastore_types.Category(mongo_value["category"])
if mongo_value['class'] == 'key':
return self.__key_for_id(mongo_value['path'])
if mongo_value['class'] == 'list':
return [self.__create_value_for_mongo_value(v)
for v in mongo_value['list']]
if mongo_value['class'] == 'user':
return users.User(email=mongo_value["email"])
if mongo_value['class'] == 'text':
return datastore_types.Text(mongo_value['string'])
if mongo_value['class'] == 'im':
return datastore_types.IM(mongo_value['protocol'],
mongo_value['address'])
if mongo_value['class'] == 'geopt':
return datastore_types.GeoPt(mongo_value['lat'], mongo_value['lon'])
if mongo_value['class'] == 'email':
return datastore_types.Email(mongo_value['value'])
if mongo_value['class'] == 'bytes':
return datastore_types.ByteString(mongo_value['value'])
if mongo_value['class'] == 'blobkey':
return datastore_types.BlobKey(mongo_value['value'])
return mongo_value
def __mongo_document_for_entity(self, entity):
document = {}
document["_id"] = self.__id_for_key(entity.key())
entity = datastore.Entity._FromPb(entity)
for (k, v) in entity.iteritems():
v = self.__create_mongo_value_for_value(v)
document[k] = v
return document
def __entity_for_mongo_document(self, document):
key = self.__key_for_id(document.get('_id'))
entity = datastore.Entity(
kind=key.kind(), parent=key.parent(), name=key.name())
for k in document.keys():
if k != '_id':
v = self.__create_value_for_mongo_value(document[k])
entity[k] = v
pb = entity._ToPb()
# no decent way to initialize an Entity w/ an existing key...
if not key.name():
pb.key().path().element_list()[-1].set_id(key.id())
return pb
def __allocate_ids(self, kind, size=None, max=None):
"""Allocates IDs.
Args:
kind: A kind.
size: Number of IDs to allocate.
max: Upper bound of IDs to allocate.
Returns:
Integer as the beginning of a range of size IDs.
"""
self.__id_lock.acquire()
ret = None
col = self.__db.datastore
_id = 'IdSeq_%s' % kind
if not col.find_one({'_id': _id}):
col.insert({'_id': _id, 'next_id': 1})
if size is not None:
assert size > 0
next_id, block_size = self.__id_map.get(kind, (0, 0))
if not block_size:
block_size = (size / 1000 + 1) * 1000
result = self.__db.command(
"findandmodify",
"datastore",
query={"_id": _id},
update={"$inc": {"next_id": next_id+block_size}})
next_id = int(result['value']['next_id'])
if size > block_size:
result = self.__db.command(
"findandmodify",
"datastore",
query={"_id": _id},
update={"$inc": {"next_id": size}})
ret = int(result['value']['next_id'])
else:
ret = next_id;
next_id += size
block_size -= size
self.__id_map[kind] = (next_id, block_size)
else:
ret = col.find_one({'_id': _id}).get('next_id')
if max and max >= ret:
col.update({'_id': _id}, {'$set': {'next_id': max+1}})
self.__id_lock.release()
return ret
def __ValidateAppId(self, app_id):
"""Verify that this is the stub for app_id.
Args:
app_id: An application ID.
Raises:
datastore_errors.BadRequestError: if this is not the stub for app_id.
"""
assert app_id
if not self.__trusted and app_id != self.__app_id:
raise datastore_errors.BadRequestError(
'app %s cannot access app %s\'s data' % (self.__app_id, app_id))
def __ValidateTransaction(self, tx):
"""Verify that this transaction exists and is valid.
Args:
tx: datastore_pb.Transaction
Raises:
datastore_errors.BadRequestError: if the tx is valid or doesn't exist.
"""
assert isinstance(tx, datastore_pb.Transaction)
self.__ValidateAppId(tx.app())
def __ValidateKey(self, key):
"""Validate this key.
Args:
key: entity_pb.Reference
Raises:
datastore_errors.BadRequestError: if the key is invalid
"""
assert isinstance(key, entity_pb.Reference)
self.__ValidateAppId(key.app())
for elem in key.path().element_list():
if elem.has_id() == elem.has_name():
raise datastore_errors.BadRequestError(
'each key path element should have id or name but not both: %r'
% key)
def __PutEntities(self, entities):
"""Inserts or updates entities in the DB.
Args:
entities: A list of entities to store.
"""
for entity in entities:
collection = self.__collection_for_key(entity.key())
document = self.__mongo_document_for_entity(entity)
unused_id = self.__db[collection].save(document).decode('utf-8')
def __DeleteEntities(self, keys):
"""Deletes entities from the DB.
Args:
keys: A list of keys to delete index entries for.
Returns:
The number of rows deleted.
"""
for key in keys:
collection = self.__collection_for_key(key)
_id = self.__id_for_key(key)
self.__db[collection].remove({"_id": _id})
return len(keys)
def _Dynamic_Put(self, put_request, put_response):
entities = put_request.entity_list()
for entity in entities:
self.__ValidateKey(entity.key())
assert entity.has_key()
assert entity.key().path().element_size() > 0
last_path = entity.key().path().element_list()[-1]
if last_path.id() == 0 and not last_path.has_name():
id_ = self.__allocate_ids(last_path.type(), 1)
last_path.set_id(id_)
assert entity.entity_group().element_size() == 0
group = entity.mutable_entity_group()
root = entity.key().path().element(0)
group.add_element().CopyFrom(root)
else:
assert (entity.has_entity_group() and
entity.entity_group().element_size() > 0)
if put_request.transaction().handle():
self.__tx_writes[entity.key()] = entity
self.__tx_deletes.discard(entity.key())
if not put_request.transaction().handle():
self.__PutEntities(entities)
put_response.key_list().extend([e.key() for e in entities])
def _Dynamic_Get(self, get_request, get_response):
for key in get_request.key_list():
collection = self.__collection_for_key(key)
_id = self.__id_for_key(key)
group = get_response.add_entity()
document = self.__db[collection].find_one({"_id": _id})
if document is None:
entity = None
else:
entity = self.__entity_for_mongo_document(document)
if entity:
group.mutable_entity().CopyFrom(entity)
def _Dynamic_Delete(self, delete_request, delete_response):
keys = delete_request.key_list()
for key in keys:
self.__ValidateAppId(key.app())
if delete_request.transaction().handle():
self.__tx_deletes.add(key)
self.__tx_writes.pop(key, None)
if not delete_request.transaction().handle():
self.__DeleteEntities(delete_request.key_list())
def __special_props(self, value, direction):
if isinstance(value, datastore_types.Category):
return ["category"]
if isinstance(value, datastore_types.GeoPt):
return ["lat", "lon"]
if isinstance(value, list):
if direction == pymongo.ASCENDING:
return ["ascending_sort_key"]
return ["descending_sort_key"]
return None
def __unorderable(self, value):
if isinstance(value, datastore_types.Text):
return True
if isinstance(value, datastore_types.Blob):
return True
return False
def __translate_order_for_mongo(self, order_list, prototype):
mongo_ordering = []
for o in order_list:
key = o.property().decode('utf-8')
value = pymongo.ASCENDING
if o.direction() is datastore_pb.Query_Order.DESCENDING:
value = pymongo.DESCENDING
if key == "__key__":
key = "_id"
mongo_ordering.append((key, value))
continue
if key not in prototype or self.__unorderable(prototype[key]):
return None
props = self.__special_props(prototype[key], value)
if props:
for prop in props:
mongo_ordering.append((key + "." + prop, value))
else:
mongo_ordering.append((key, value))
return mongo_ordering
def __filter_suffix(self, value):
if isinstance(value, types.ListType):
return ".list"
return ""
def __filter_binding(self, key, value, operation, prototype):
if key in prototype:
key += self.__filter_suffix(prototype[key])
if key == "__key__":
key = "_id"
value = self.__id_for_key(value._ToPb())
else:
value = self.__create_mongo_value_for_value(value)
if operation == "<":
return (key, {'$lt': value})
elif operation == '<=':
return (key, {'$lte': value})
elif operation == '>':
return (key, {'$gt': value})
elif operation == '>=':
return (key, {'$gte': value})
elif operation == '==':
return (key, value)
raise apiproxy_errors.ApplicationError(
datastore_pb.Error.BAD_REQUEST, "Can't handle operation %r." % operation)
def _MinimalQueryInfo(self, query):
"""Extract the minimal set of information for query matching.
Args:
query: datastore_pb.Query instance from which to extract info.
Returns:
datastore_pb.Query instance suitable for matching against when
validating cursors.
"""
query_info = datastore_pb.Query()
query_info.set_app(query.app())
for filter in query.filter_list():
query_info.filter_list().append(filter)
for order in query.order_list():
query_info.order_list().append(order)
if query.has_ancestor():
query_info.mutable_ancestor().CopyFrom(query.ancestor())
for attr in ('kind', 'name_space', 'search_query', 'offset', 'limit'):
query_has_attr = getattr(query, 'has_%s' % attr)
query_attr = getattr(query, attr)
query_info_set_attr = getattr(query_info, 'set_%s' % attr)
if query_has_attr():
query_info_set_attr(query_attr())
return query_info
def _DecodeCompiledCursor(self, compiled_cursor):
"""Converts a compiled_cursor into a cursor_entity.
Args:
compiled_cursor: Cursor instance to decode.
Returns:
(offset, query_pb, cursor_entity, inclusive)
"""
assert len(compiled_cursor.position_list()) == 1
position = compiled_cursor.position(0)
entity_pb = datastore_pb.EntityProto()
(count, query_info_encoded, entity_encoded) = position.start_key().split(
_CURSOR_CONCAT_STR)
query_info_pb = datastore_pb.Query()
query_info_pb.ParseFromString(query_info_encoded)
entity_pb.ParseFromString(entity_encoded)
offset = int(count) + query_info_pb.offset()
return (offset,
query_info_pb,
datastore.Entity._FromPb(entity_pb, True),
position.start_inclusive())
def _Dynamic_RunQuery(self, query, query_result):
if query.keys_only():
query_result.set_keys_only(True)
num_components = len(query.filter_list()) + len(query.order_list())
if query.has_ancestor():
num_components += 1
if num_components > _MAX_QUERY_COMPONENTS:
raise apiproxy_errors.ApplicationError(
datastore_pb.Error.BAD_REQUEST,
('query is too large. may not have more than %s filters'
' + sort orders ancestor total' % _MAX_QUERY_COMPONENTS))
app = query.app()
query_result.mutable_cursor().set_cursor(0)
query_result.set_more_results(False)
if self.__require_indexes:
(required, kind, ancestor, props, num_eq_filters) = (
datastore_index.CompositeIndexForQuery(query))
if required:
index = entity_pb.CompositeIndex()
index.mutable_definition().set_entity_type(kind)
index.mutable_definition().set_ancestor(ancestor)
for (k, v) in props:
p = index.mutable_definition().add_property()
p.set_name(k)
p.set_direction(v)
if props and not self.__has_index(index):
raise apiproxy_errors.ApplicationError(
datastore_pb.Error.NEED_INDEX,
"This query requires a composite index that is not defined. "
"You must update the index.yaml file in your application root.")
collection = query.kind()
if query.has_name_space():
collection = query.name_space() + _NAMESPACE_CONCAT_STR + collection
clone = datastore_pb.Query()
clone.CopyFrom(query)
clone.clear_hint()
if clone in self.__query_history:
self.__query_history[clone] += 1
else:
self.__query_history[clone] = 1
# HACK we need to get one Entity from this collection so we know what the
# property types are (because we need to construct queries that depend on
# the types of the properties)...
try:
prototype = self.__db[collection].find_one()
except pymongo.errors.InvalidName:
raise datastore_errors.BadRequestError('query without kind')
if prototype is None:
return
prototype = datastore.Entity._FromPb(
self.__entity_for_mongo_document(prototype))
spec = {}
if query.has_ancestor():
spec["_id"] = re.compile("^%s.*$" % self.__id_for_key(query.ancestor()))
operators = {datastore_pb.Query_Filter.LESS_THAN: '<',
datastore_pb.Query_Filter.LESS_THAN_OR_EQUAL: '<=',
datastore_pb.Query_Filter.GREATER_THAN: '>',
datastore_pb.Query_Filter.GREATER_THAN_OR_EQUAL: '>=',
datastore_pb.Query_Filter.EQUAL: '==',
}
for filt in query.filter_list():
assert filt.op() != datastore_pb.Query_Filter.IN
prop = filt.property(0).name().decode('utf-8')
op = operators[filt.op()]
filter_val_list = [datastore_types.FromPropertyPb(filter_prop)
for filter_prop in filt.property_list()]
(key, value) = self.__filter_binding(prop,
filter_val_list[0],
op,
prototype)
if key in spec:
if (not isinstance(spec[key], types.DictType)
and not isinstance(value, types.DictType)):
if spec[key] != value:
return
elif not isinstance(spec[key], types.DictType):
value["$in"] = [spec[key]]
spec[key] = value
elif not isinstance(value, types.DictType):
spec[key]["$in"] = [value]
else:
spec[key].update(value)
else:
spec[key] = value
offset = 0
# Cursor magic
if query.has_compiled_cursor():
offset, query_pb, unused_spec, incl = self._DecodeCompiledCursor(
query.compiled_cursor())
cursor = self.__db[collection].find(spec)
order = self.__translate_order_for_mongo(query.order_list(), prototype)
if order is None:
return
if order:
cursor = cursor.sort(order)
if query.offset() == datastore._MAX_INT_32:
query.set_offset(0)
query.set_limit(datastore._MAX_INT_32)
if offset:
cursor = cursor.skip(int(offset))
elif query.has_offset() and query.offset() != _MAX_QUERY_OFFSET:
cursor = cursor.skip(int(query.offset()))
if query.has_limit():
cursor = cursor.limit(int(query.limit()))
self.__cursor_lock.acquire()
cursor_index = self.__next_cursor
self.__next_cursor += 1
self.__cursor_lock.release()
self.__queries[cursor_index] = cursor
# Cursor magic
compiled_cursor = query_result.mutable_compiled_cursor()
position = compiled_cursor.add_position()
query_info = self._MinimalQueryInfo(query)
cloned_cursor = cursor.clone()
results = list(cloned_cursor)
if results:
start_key = _CURSOR_CONCAT_STR.join((
str(len(results) + offset),
query_info.Encode(),
self.__entity_for_mongo_document(results[-1]).Encode()
))
# Populate query result
result_list = query_result.result_list()
for doc in results:
result_list.append(self.__entity_for_mongo_document(doc))
query_result.set_skipped_results(len(results))
position.set_start_key(str(start_key))
position.set_start_inclusive(False)
del cloned_cursor
query_result.mutable_cursor().set_cursor(cursor_index)
query_result.set_more_results(False)
def _Dynamic_Next(self, next_request, query_result):
cursor = next_request.cursor().cursor()
query_result.set_more_results(False)
if cursor == 0: # we exited early from the query w/ no results...
return
try:
cursor = self.__queries[cursor]
except KeyError:
raise apiproxy_errors.ApplicationError(datastore_pb.Error.BAD_REQUEST,
'Cursor %d not found' % cursor)
query_result.set_more_results(True)
def _Dynamic_BeginTransaction(self, request, transaction):
self.__ValidateAppId(request.app())
self.__tx_lock.acquire()
handle = self.__next_tx_handle
self.__next_tx_handle += 1
transaction.set_app(request.app())
transaction.set_handle(handle)
self.__tx_actions = []
def _Dynamic_AddActions(self, request, _):
"""Associates the creation of one or more tasks with a transaction.
Args:
request: A taskqueue_service_pb.TaskQueueBulkAddRequest containing the
tasks that should be created when the transaction is comitted.
"""
if ((len(self.__tx_actions) + request.add_request_size()) >
_MAX_ACTIONS_PER_TXN):
raise apiproxy_errors.ApplicationError(
datastore_pb.Error.BAD_REQUEST,
'Too many messages, maximum allowed %s' % _MAX_ACTIONS_PER_TXN)
new_actions = []
for add_request in request.add_request_list():
self.__ValidateTransaction(add_request.transaction())
clone = taskqueue_service_pb.TaskQueueAddRequest()
clone.CopyFrom(add_request)
clone.clear_transaction()
new_actions.append(clone)
self.__tx_actions.extend(new_actions)
def _Dynamic_Commit(self, transaction, transaction_response):
self.__ValidateTransaction(transaction)
try:
self.__PutEntities(self.__tx_writes.values())
self.__DeleteEntities(self.__tx_deletes)
for action in self.__tx_actions:
try:
apiproxy_stub_map.MakeSyncCall(
'taskqueue', 'Add', action, api_base_pb.VoidProto())
except apiproxy_errors.ApplicationError, e:
logging.warning('Transactional task %s has been dropped, %s',
action, e)
pass
finally:
self.__tx_writes = {}
self.__tx_deletes = set()
self.__tx_actions = []
self.__tx_lock.release()
def _Dynamic_Rollback(self, transaction, transaction_response):
self.__ValidateTransaction(transaction)
self.__tx_writes = {}
self.__tx_deletes = set()
self.__tx_actions = []
self.__tx_lock.release()
def _Dynamic_GetSchema(self, app_str, schema):
# TODO this is used for the admin viewer to introspect.
pass
def __collection_and_spec_for_index(self, index):
def translate_name(ae_name):
if ae_name == "__key__":
return "_id"
return ae_name
def translate_direction(ae_dir):
if ae_dir == 1:
return pymongo.ASCENDING
elif ae_dir == 2:
return pymongo.DESCENDING
raise apiproxy_errors.ApplicationError(datastore_pb.Error.BAD_REQUEST,
'Weird direction.')
collection = index.definition().entity_type()
spec = []
for prop in index.definition().property_list():
spec.append(
(translate_name(prop.name()), translate_direction(prop.direction())))
return (collection, spec)
def _Dynamic_AllocateIds(self, allocate_ids_request, allocate_ids_response):
model_key = allocate_ids_request.model_key()
kind = model_key.path().element(0).type()
if allocate_ids_request.has_size() and allocate_ids_request.has_max():
raise apiproxy_errors.ApplicationError(datastore_pb.Error.BAD_REQUEST,
'Both size and max cannot be set.')
if allocate_ids_request.has_size():
if allocate_ids_request.size() < 1:
raise apiproxy_errors.ApplicationError(datastore_pb.Error.BAD_REQUEST,
'Size must be greater than 0.')
first_id = self.__allocate_ids(kind, size=allocate_ids_request.size())
allocate_ids_response.set_start(first_id)
allocate_ids_response.set_end(first_id + allocate_ids_request.size() - 1)
else:
if allocate_ids_request.max() < 0:
raise apiproxy_errors.ApplicationError(
datastore_pb.Error.BAD_REQUEST,
'Max must be greater than or equal to 0.')
first_id = self.__allocate_ids(kind, max=allocate_ids_request.max())
allocate_ids_response.set_start(first_id)
allocate_ids_response.set_end(max(allocate_ids_request.max(),
first_id - 1))
def __gen_index_name(self, keys):
"""Generate an index name from the set of fields it is over."""
return u"_".join([u"%s_%s" % item for item in keys])
def __has_index(self, index):
(collection, spec) = self.__collection_and_spec_for_index(index)
if (self.__gen_index_name(spec)
in self.__db[collection].index_information().keys()):
return True
return False
def _Dynamic_CreateIndex(self, index, id_response):
if index.id() != 0:
raise apiproxy_errors.ApplicationError(datastore_pb.Error.BAD_REQUEST,
'New index id must be 0.')
elif self.__has_index(index):
logging.getLogger().info(index)
raise apiproxy_errors.ApplicationError(datastore_pb.Error.BAD_REQUEST,
'Index already exists.')
(collection, spec) = self.__collection_and_spec_for_index(index)
if spec: # otherwise it's probably an index w/ just an ancestor specifier
self.__db[collection].create_index(spec)
if self.__db.error():
raise apiproxy_errors.ApplicationError(datastore_pb.Error.BAD_REQUEST,
'Error creating index. Maybe '
'too many indexes?')
# NOTE just give it a dummy id. we don't use these for anything...
id_response.set_value(1)
def _Dynamic_GetIndices(self, app_str, composite_indices):
if app_str.value() != self.__db.name():
raise apiproxy_errors.ApplicationError(datastore_pb.Error.BAD_REQUEST,
'Getting indexes for a different '
'app unsupported.')
def from_index_name(name):
elements = name.split("_")
index = []
while len(elements):
if not elements[0]:
elements = elements[1:]
elements[0] = "_" + elements[0]
index.append((elements[0], int(elements[1])))
elements = elements[2:]
return index
for collection in self.__db.collection_names():
info = self.__db[collection].index_information()
for index in info.keys():
index_pb = entity_pb.CompositeIndex()
index_pb.set_app_id(self.__db.name())
index_pb.mutable_definition().set_entity_type(collection)
index_pb.mutable_definition().set_ancestor(False)
index_pb.set_state(2) # READ_WRITE
index_pb.set_id(1) # bogus id
for (k, v) in from_index_name(index):
if k == "_id":
k = "__key__"
p = index_pb.mutable_definition().add_property()
p.set_name(k)
p.set_direction(v == pymongo.ASCENDING and 1 or 2)
composite_indices.index_list().append(index_pb)
def _Dynamic_UpdateIndex(self, index, void):
logging.log(logging.WARN, 'update index unsupported')
def _Dynamic_DeleteIndex(self, index, void):
(collection, spec) = self.__collection_and_spec_for_index(index)
if not spec:
return
if not self.__has_index(index):
raise apiproxy_errors.ApplicationError(datastore_pb.Error.BAD_REQUEST,
"Index doesn't exist.")
self.__db[collection].drop_index(spec)
class DatastoreMongoStub(apiproxy_stub.APIProxyStub):
"""Persistent stub for the Python datastore API, using MongoDB to persist.
A DatastoreMongoStub instance handles a single app's data.
"""
def __init__(self,
app_id,
datastore_file=None,
require_indexes=False,
service_name='datastore_v3'):
"""Constructor.
Initializes the datastore stub.
Args:
app_id: string
datastore_file: ignored
require_indexes: bool, default False. If True, composite indexes must
exist in index.yaml for queries that need them.
service_name: Service name expected for all calls.
"""
super(DatastoreMongoStub, self).__init__(service_name)
assert isinstance(app_id, basestring) and app_id != ''
self.__app_id = app_id
self.__require_indexes = require_indexes
self.__trusted = True
# TODO should be a way to configure the connection
self.__db = Connection()[app_id]
# NOTE our query history gets reset each time the server restarts...
# should this be fixed?
self.__query_history = {}
self.__next_index_id = 1
self.__indexes = {}
self.__index_lock = threading.Lock()
self.__cursor_lock = threading.Lock()
self.__next_cursor = 1
self.__queries = {}
self.__id_lock = threading.Lock()
self.__id_map = {}
# Transaction support
self.__next_tx_handle = 1
self.__tx_writes = {}
self.__tx_deletes = set()
self.__tx_actions = []
self.__tx_lock = threading.Lock()
def Clear(self):
"""Clears the datastore.
This is mainly for testing purposes and the admin console.
"""
for name in self.__db.collection_names():
if not name.startswith('system.'):
self.__db.drop_collection(name)
self.__queries = {}
self.__query_history = {}
self.__indexes = {}
self.__id_map = {}
self.__next_tx_handle = 1
self.__tx_writes = {}
self.__tx_deletes = set()
self.__tx_actions = []
self.__db.datastore.drop()
def MakeSyncCall(self, service, call, request, response):
""" The main RPC entry point. service must be 'datastore_v3'.
So far, the supported calls are 'Get', 'Put', 'Delete', 'RunQuery', 'Next',
and 'AllocateIds'.
"""
self.AssertPbIsInitialized(request)
super(DatastoreMongoStub, self).MakeSyncCall(service, call, request,
response)
self.AssertPbIsInitialized(response)
def AssertPbIsInitialized(self, pb):
"""Raises an exception if the given PB is not initialized and valid."""
explanation = []
assert pb.IsInitialized(explanation), explanation
pb.Encode()
def QueryHistory(self):
"""Returns a dict that maps Query PBs to times they've been run."""
return dict((pb, times) for pb, times in self.__query_history.items()
if pb.app() == self.__app_id)
def __collection_for_key(self, key):
collection = key.path().element(-1).type()
if key.has_name_space():
collection = key.name_space() + _NAMESPACE_CONCAT_STR + collection
return collection
def __id_for_key(self, key):
db_path = []
def add_element_to_db_path(elem):
db_path.append(elem.type())
if elem.has_name():
db_path.append(elem.name())
else:
db_path.append("\t" + str(elem.id()).zfill(10))
for elem in key.path().element_list():
add_element_to_db_path(elem)
return "\10".join(db_path)
def __key_for_id(self, id):
def from_db(value):
if value.startswith("\t"):
return int(value[1:])
return value
return datastore_types.Key.from_path(
*[from_db(a) for a in id.split("\10")])
def __create_mongo_value_for_value(self, value):
if isinstance(value, datastore_types.Rating):
return {
'class': 'rating',
'rating': int(value),
}
if isinstance(value, datastore_types.Category):
return {
'class': 'category',
'category': str(value),
}
if isinstance(value, datastore_types.Key):
return {
'class': 'key',
'path': self.__id_for_key(value._ToPb()),
}
if isinstance(value, types.ListType):
list_for_db = [
self.__create_mongo_value_for_value(v) for v in value
]
sorted_list = sorted(value)
return {
'class':
'list',
'list':
list_for_db,
'ascending_sort_key':
self.__create_mongo_value_for_value(sorted_list[0]),
'descending_sort_key':
self.__create_mongo_value_for_value(sorted_list[-1]),
}
if isinstance(value, users.User):
return {
'class': 'user',
'email': value.email(),
}
if isinstance(value, datastore_types.Text):
return {
'class': 'text',
'string': unicode(value),
}
if isinstance(value, datastore_types.Blob):
return Binary(value)
if isinstance(value, datastore_types.ByteString):
return {'class': 'bytes', 'value': Binary(value)}
if isinstance(value, datastore_types.IM):
return {
'class': 'im',
'protocol': value.protocol,
'address': value.address,
}
if isinstance(value, datastore_types.GeoPt):
return {
'class': 'geopt',
'lat': value.lat,
'lon': value.lon,
}
if isinstance(value, datastore_types.Email):
return {
'class': 'email',
'value': value,
}
if isinstance(value, datastore_types.BlobKey):
return {
'class': 'blobkey',
'value': str(value),
}
return value
def __create_value_for_mongo_value(self, mongo_value):
if isinstance(mongo_value, Binary):
return datastore_types.Blob(str(mongo_value))
if isinstance(mongo_value, types.DictType):
if mongo_value['class'] == 'rating':
return datastore_types.Rating(int(mongo_value["rating"]))
if mongo_value['class'] == 'category':
return datastore_types.Category(mongo_value["category"])
if mongo_value['class'] == 'key':
return self.__key_for_id(mongo_value['path'])
if mongo_value['class'] == 'list':
return [
self.__create_value_for_mongo_value(v)
for v in mongo_value['list']
]
if mongo_value['class'] == 'user':
return users.User(email=mongo_value["email"])
if mongo_value['class'] == 'text':
return datastore_types.Text(mongo_value['string'])
if mongo_value['class'] == 'im':
return datastore_types.IM(mongo_value['protocol'],
mongo_value['address'])
if mongo_value['class'] == 'geopt':
return datastore_types.GeoPt(mongo_value['lat'],
mongo_value['lon'])
if mongo_value['class'] == 'email':
return datastore_types.Email(mongo_value['value'])
if mongo_value['class'] == 'bytes':
return datastore_types.ByteString(mongo_value['value'])
if mongo_value['class'] == 'blobkey':
return datastore_types.BlobKey(mongo_value['value'])
return mongo_value
def __mongo_document_for_entity(self, entity):
document = {}
document["_id"] = self.__id_for_key(entity.key())
entity = datastore.Entity._FromPb(entity)
for (k, v) in entity.iteritems():
v = self.__create_mongo_value_for_value(v)
document[k] = v
return document
def __entity_for_mongo_document(self, document):
key = self.__key_for_id(document.get('_id'))
entity = datastore.Entity(kind=key.kind(),
parent=key.parent(),
name=key.name())
for k in document.keys():
if k != '_id':
v = self.__create_value_for_mongo_value(document[k])
entity[k] = v
pb = entity._ToPb()
# no decent way to initialize an Entity w/ an existing key...
if not key.name():
pb.key().path().element_list()[-1].set_id(key.id())
return pb
def __allocate_ids(self, kind, size=None, max=None):
"""Allocates IDs.
Args:
kind: A kind.
size: Number of IDs to allocate.
max: Upper bound of IDs to allocate.
Returns:
Integer as the beginning of a range of size IDs.
"""
self.__id_lock.acquire()
ret = None
col = self.__db.datastore
_id = 'IdSeq_%s' % kind
if not col.find_one({'_id': _id}):
col.insert({'_id': _id, 'next_id': 1})
if size is not None:
assert size > 0
next_id, block_size = self.__id_map.get(kind, (0, 0))
if not block_size:
block_size = (size / 1000 + 1) * 1000
result = self.__db.command(
"findandmodify",
"datastore",
query={"_id": _id},
update={"$inc": {
"next_id": next_id + block_size
}})
next_id = int(result['value']['next_id'])
if size > block_size:
result = self.__db.command("findandmodify",
"datastore",
query={"_id": _id},
update={"$inc": {
"next_id": size
}})
ret = int(result['value']['next_id'])
else:
ret = next_id
next_id += size
block_size -= size
self.__id_map[kind] = (next_id, block_size)
else:
ret = col.find_one({'_id': _id}).get('next_id')
if max and max >= ret:
col.update({'_id': _id}, {'$set': {'next_id': max + 1}})
self.__id_lock.release()
return ret
def __ValidateAppId(self, app_id):
"""Verify that this is the stub for app_id.
Args:
app_id: An application ID.
Raises:
datastore_errors.BadRequestError: if this is not the stub for app_id.
"""
assert app_id
if not self.__trusted and app_id != self.__app_id:
raise datastore_errors.BadRequestError(
'app %s cannot access app %s\'s data' %
(self.__app_id, app_id))
def __ValidateTransaction(self, tx):
"""Verify that this transaction exists and is valid.
Args:
tx: datastore_pb.Transaction
Raises:
datastore_errors.BadRequestError: if the tx is valid or doesn't exist.
"""
assert isinstance(tx, datastore_pb.Transaction)
self.__ValidateAppId(tx.app())
def __ValidateKey(self, key):
"""Validate this key.
Args:
key: entity_pb.Reference
Raises:
datastore_errors.BadRequestError: if the key is invalid
"""
assert isinstance(key, entity_pb.Reference)
self.__ValidateAppId(key.app())
for elem in key.path().element_list():
if elem.has_id() == elem.has_name():
raise datastore_errors.BadRequestError(
'each key path element should have id or name but not both: %r'
% key)
def __PutEntities(self, entities):
"""Inserts or updates entities in the DB.
Args:
entities: A list of entities to store.
"""
for entity in entities:
collection = self.__collection_for_key(entity.key())
document = self.__mongo_document_for_entity(entity)
unused_id = self.__db[collection].save(document).decode('utf-8')
def __DeleteEntities(self, keys):
"""Deletes entities from the DB.
Args:
keys: A list of keys to delete index entries for.
Returns:
The number of rows deleted.
"""
for key in keys:
collection = self.__collection_for_key(key)
_id = self.__id_for_key(key)
self.__db[collection].remove({"_id": _id})
return len(keys)
def _Dynamic_Put(self, put_request, put_response):
entities = put_request.entity_list()
for entity in entities:
self.__ValidateKey(entity.key())
assert entity.has_key()
assert entity.key().path().element_size() > 0
last_path = entity.key().path().element_list()[-1]
if last_path.id() == 0 and not last_path.has_name():
id_ = self.__allocate_ids(last_path.type(), 1)
last_path.set_id(id_)
assert entity.entity_group().element_size() == 0
group = entity.mutable_entity_group()
root = entity.key().path().element(0)
group.add_element().CopyFrom(root)
else:
assert (entity.has_entity_group()
and entity.entity_group().element_size() > 0)
if put_request.transaction().handle():
self.__tx_writes[entity.key()] = entity
self.__tx_deletes.discard(entity.key())
if not put_request.transaction().handle():
self.__PutEntities(entities)
put_response.key_list().extend([e.key() for e in entities])
def _Dynamic_Get(self, get_request, get_response):
for key in get_request.key_list():
collection = self.__collection_for_key(key)
_id = self.__id_for_key(key)
group = get_response.add_entity()
document = self.__db[collection].find_one({"_id": _id})
if document is None:
entity = None
else:
entity = self.__entity_for_mongo_document(document)
if entity:
group.mutable_entity().CopyFrom(entity)
def _Dynamic_Delete(self, delete_request, delete_response):
keys = delete_request.key_list()
for key in keys:
self.__ValidateAppId(key.app())
if delete_request.transaction().handle():
self.__tx_deletes.add(key)
self.__tx_writes.pop(key, None)
if not delete_request.transaction().handle():
self.__DeleteEntities(delete_request.key_list())
def __special_props(self, value, direction):
if isinstance(value, datastore_types.Category):
return ["category"]
if isinstance(value, datastore_types.GeoPt):
return ["lat", "lon"]
if isinstance(value, list):
if direction == pymongo.ASCENDING:
return ["ascending_sort_key"]
return ["descending_sort_key"]
return None
def __unorderable(self, value):
if isinstance(value, datastore_types.Text):
return True
if isinstance(value, datastore_types.Blob):
return True
return False
def __translate_order_for_mongo(self, order_list, prototype):
mongo_ordering = []
for o in order_list:
key = o.property().decode('utf-8')
value = pymongo.ASCENDING
if o.direction() is datastore_pb.Query_Order.DESCENDING:
value = pymongo.DESCENDING
if key == "__key__":
key = "_id"
mongo_ordering.append((key, value))
continue
if key not in prototype or self.__unorderable(prototype[key]):
return None
props = self.__special_props(prototype[key], value)
if props:
for prop in props:
mongo_ordering.append((key + "." + prop, value))
else:
mongo_ordering.append((key, value))
return mongo_ordering
def __filter_suffix(self, value):
if isinstance(value, types.ListType):
return ".list"
return ""
def __filter_binding(self, key, value, operation, prototype):
if key in prototype:
key += self.__filter_suffix(prototype[key])
if key == "__key__":
key = "_id"
value = self.__id_for_key(value._ToPb())
else:
value = self.__create_mongo_value_for_value(value)
if operation == "<":
return (key, {'$lt': value})
elif operation == '<=':
return (key, {'$lte': value})
elif operation == '>':
return (key, {'$gt': value})
elif operation == '>=':
return (key, {'$gte': value})
elif operation == '==':
return (key, value)
raise apiproxy_errors.ApplicationError(
datastore_pb.Error.BAD_REQUEST,
"Can't handle operation %r." % operation)
def _MinimalQueryInfo(self, query):
"""Extract the minimal set of information for query matching.
Args:
query: datastore_pb.Query instance from which to extract info.
Returns:
datastore_pb.Query instance suitable for matching against when
validating cursors.
"""
query_info = datastore_pb.Query()
query_info.set_app(query.app())
for filter in query.filter_list():
query_info.filter_list().append(filter)
for order in query.order_list():
query_info.order_list().append(order)
if query.has_ancestor():
query_info.mutable_ancestor().CopyFrom(query.ancestor())
for attr in ('kind', 'name_space', 'search_query', 'offset', 'limit'):
query_has_attr = getattr(query, 'has_%s' % attr)
query_attr = getattr(query, attr)
query_info_set_attr = getattr(query_info, 'set_%s' % attr)
if query_has_attr():
query_info_set_attr(query_attr())
return query_info
def _DecodeCompiledCursor(self, compiled_cursor):
"""Converts a compiled_cursor into a cursor_entity.
Args:
compiled_cursor: Cursor instance to decode.
Returns:
(offset, query_pb, cursor_entity, inclusive)
"""
assert len(compiled_cursor.position_list()) == 1
position = compiled_cursor.position(0)
entity_pb = datastore_pb.EntityProto()
(count, query_info_encoded,
entity_encoded) = position.start_key().split(_CURSOR_CONCAT_STR)
query_info_pb = datastore_pb.Query()
query_info_pb.ParseFromString(query_info_encoded)
entity_pb.ParseFromString(entity_encoded)
offset = int(count) + query_info_pb.offset()
return (offset, query_info_pb,
datastore.Entity._FromPb(entity_pb,
True), position.start_inclusive())
def _Dynamic_RunQuery(self, query, query_result):
if query.keys_only():
query_result.set_keys_only(True)
num_components = len(query.filter_list()) + len(query.order_list())
if query.has_ancestor():
num_components += 1
if num_components > _MAX_QUERY_COMPONENTS:
raise apiproxy_errors.ApplicationError(
datastore_pb.Error.BAD_REQUEST,
('query is too large. may not have more than %s filters'
' + sort orders ancestor total' % _MAX_QUERY_COMPONENTS))
app = query.app()
query_result.mutable_cursor().set_cursor(0)
query_result.set_more_results(False)
if self.__require_indexes:
(required, kind, ancestor, props,
num_eq_filters) = (datastore_index.CompositeIndexForQuery(query))
if required:
index = entity_pb.CompositeIndex()
index.mutable_definition().set_entity_type(kind)
index.mutable_definition().set_ancestor(ancestor)
for (k, v) in props:
p = index.mutable_definition().add_property()
p.set_name(k)
p.set_direction(v)
if props and not self.__has_index(index):
raise apiproxy_errors.ApplicationError(
datastore_pb.Error.NEED_INDEX,
"This query requires a composite index that is not defined. "
"You must update the index.yaml file in your application root."
)
collection = query.kind()
if query.has_name_space():
collection = query.name_space(
) + _NAMESPACE_CONCAT_STR + collection
clone = datastore_pb.Query()
clone.CopyFrom(query)
clone.clear_hint()
if clone in self.__query_history:
self.__query_history[clone] += 1
else:
self.__query_history[clone] = 1
# HACK we need to get one Entity from this collection so we know what the
# property types are (because we need to construct queries that depend on
# the types of the properties)...
try:
prototype = self.__db[collection].find_one()
except pymongo.errors.InvalidName:
raise datastore_errors.BadRequestError('query without kind')
if prototype is None:
return
prototype = datastore.Entity._FromPb(
self.__entity_for_mongo_document(prototype))
spec = {}
if query.has_ancestor():
spec["_id"] = re.compile("^%s.*$" %
self.__id_for_key(query.ancestor()))
operators = {
datastore_pb.Query_Filter.LESS_THAN: '<',
datastore_pb.Query_Filter.LESS_THAN_OR_EQUAL: '<=',
datastore_pb.Query_Filter.GREATER_THAN: '>',
datastore_pb.Query_Filter.GREATER_THAN_OR_EQUAL: '>=',
datastore_pb.Query_Filter.EQUAL: '==',
}
for filt in query.filter_list():
assert filt.op() != datastore_pb.Query_Filter.IN
prop = filt.property(0).name().decode('utf-8')
op = operators[filt.op()]
filter_val_list = [
datastore_types.FromPropertyPb(filter_prop)
for filter_prop in filt.property_list()
]
(key, value) = self.__filter_binding(prop, filter_val_list[0], op,
prototype)
if key in spec:
if (not isinstance(spec[key], types.DictType)
and not isinstance(value, types.DictType)):
if spec[key] != value:
return
elif not isinstance(spec[key], types.DictType):
value["$in"] = [spec[key]]
spec[key] = value
elif not isinstance(value, types.DictType):
spec[key]["$in"] = [value]
else:
spec[key].update(value)
else:
spec[key] = value
offset = 0
# Cursor magic
if query.has_compiled_cursor():
offset, query_pb, unused_spec, incl = self._DecodeCompiledCursor(
query.compiled_cursor())
cursor = self.__db[collection].find(spec)
order = self.__translate_order_for_mongo(query.order_list(), prototype)
if order is None:
return
if order:
cursor = cursor.sort(order)
if query.offset() == datastore._MAX_INT_32:
query.set_offset(0)
query.set_limit(datastore._MAX_INT_32)
if offset:
cursor = cursor.skip(int(offset))
elif query.has_offset() and query.offset() != _MAX_QUERY_OFFSET:
cursor = cursor.skip(int(query.offset()))
if query.has_limit():
cursor = cursor.limit(int(query.limit()))
self.__cursor_lock.acquire()
cursor_index = self.__next_cursor
self.__next_cursor += 1
self.__cursor_lock.release()
self.__queries[cursor_index] = cursor
# Cursor magic
compiled_cursor = query_result.mutable_compiled_cursor()
position = compiled_cursor.add_position()
query_info = self._MinimalQueryInfo(query)
cloned_cursor = cursor.clone()
results = list(cloned_cursor)
if results:
start_key = _CURSOR_CONCAT_STR.join(
(str(len(results) + offset), query_info.Encode(),
self.__entity_for_mongo_document(results[-1]).Encode()))
# Populate query result
result_list = query_result.result_list()
for doc in results:
result_list.append(self.__entity_for_mongo_document(doc))
query_result.set_skipped_results(len(results))
position.set_start_key(str(start_key))
position.set_start_inclusive(False)
del cloned_cursor
query_result.mutable_cursor().set_cursor(cursor_index)
query_result.set_more_results(False)
def _Dynamic_Next(self, next_request, query_result):
cursor = next_request.cursor().cursor()
query_result.set_more_results(False)
if cursor == 0: # we exited early from the query w/ no results...
return
try:
cursor = self.__queries[cursor]
except KeyError:
raise apiproxy_errors.ApplicationError(
datastore_pb.Error.BAD_REQUEST, 'Cursor %d not found' % cursor)
query_result.set_more_results(True)
def _Dynamic_BeginTransaction(self, request, transaction):
self.__ValidateAppId(request.app())
self.__tx_lock.acquire()
handle = self.__next_tx_handle
self.__next_tx_handle += 1
transaction.set_app(request.app())
transaction.set_handle(handle)
self.__tx_actions = []
def _Dynamic_AddActions(self, request, _):
"""Associates the creation of one or more tasks with a transaction.
Args:
request: A taskqueue_service_pb.TaskQueueBulkAddRequest containing the
tasks that should be created when the transaction is comitted.
"""
if ((len(self.__tx_actions) + request.add_request_size()) >
_MAX_ACTIONS_PER_TXN):
raise apiproxy_errors.ApplicationError(
datastore_pb.Error.BAD_REQUEST,
'Too many messages, maximum allowed %s' % _MAX_ACTIONS_PER_TXN)
new_actions = []
for add_request in request.add_request_list():
self.__ValidateTransaction(add_request.transaction())
clone = taskqueue_service_pb.TaskQueueAddRequest()
clone.CopyFrom(add_request)
clone.clear_transaction()
new_actions.append(clone)
self.__tx_actions.extend(new_actions)
def _Dynamic_Commit(self, transaction, transaction_response):
self.__ValidateTransaction(transaction)
try:
self.__PutEntities(self.__tx_writes.values())
self.__DeleteEntities(self.__tx_deletes)
for action in self.__tx_actions:
try:
apiproxy_stub_map.MakeSyncCall('taskqueue', 'Add', action,
api_base_pb.VoidProto())
except apiproxy_errors.ApplicationError, e:
logging.warning(
'Transactional task %s has been dropped, %s', action,
e)
pass
finally:
self.__tx_writes = {}
self.__tx_deletes = set()
self.__tx_actions = []
self.__tx_lock.release()
def _Dynamic_Rollback(self, transaction, transaction_response):
self.__ValidateTransaction(transaction)
self.__tx_writes = {}
self.__tx_deletes = set()
self.__tx_actions = []
self.__tx_lock.release()
def _Dynamic_GetSchema(self, app_str, schema):
# TODO this is used for the admin viewer to introspect.
pass
def __collection_and_spec_for_index(self, index):
def translate_name(ae_name):
if ae_name == "__key__":
return "_id"
return ae_name
def translate_direction(ae_dir):
if ae_dir == 1:
return pymongo.ASCENDING
elif ae_dir == 2:
return pymongo.DESCENDING
raise apiproxy_errors.ApplicationError(
datastore_pb.Error.BAD_REQUEST, 'Weird direction.')
collection = index.definition().entity_type()
spec = []
for prop in index.definition().property_list():
spec.append((translate_name(prop.name()),
translate_direction(prop.direction())))
return (collection, spec)
def _Dynamic_AllocateIds(self, allocate_ids_request,
allocate_ids_response):
model_key = allocate_ids_request.model_key()
kind = model_key.path().element(0).type()
if allocate_ids_request.has_size() and allocate_ids_request.has_max():
raise apiproxy_errors.ApplicationError(
datastore_pb.Error.BAD_REQUEST,
'Both size and max cannot be set.')
if allocate_ids_request.has_size():
if allocate_ids_request.size() < 1:
raise apiproxy_errors.ApplicationError(
datastore_pb.Error.BAD_REQUEST,
'Size must be greater than 0.')
first_id = self.__allocate_ids(kind,
size=allocate_ids_request.size())
allocate_ids_response.set_start(first_id)
allocate_ids_response.set_end(first_id +
allocate_ids_request.size() - 1)
else:
if allocate_ids_request.max() < 0:
raise apiproxy_errors.ApplicationError(
datastore_pb.Error.BAD_REQUEST,
'Max must be greater than or equal to 0.')
first_id = self.__allocate_ids(kind,
max=allocate_ids_request.max())
allocate_ids_response.set_start(first_id)
allocate_ids_response.set_end(
max(allocate_ids_request.max(), first_id - 1))
def __gen_index_name(self, keys):
"""Generate an index name from the set of fields it is over."""
return u"_".join([u"%s_%s" % item for item in keys])
def __has_index(self, index):
(collection, spec) = self.__collection_and_spec_for_index(index)
if (self.__gen_index_name(spec)
in self.__db[collection].index_information().keys()):
return True
return False
def _Dynamic_CreateIndex(self, index, id_response):
if index.id() != 0:
raise apiproxy_errors.ApplicationError(
datastore_pb.Error.BAD_REQUEST, 'New index id must be 0.')
elif self.__has_index(index):
logging.getLogger().info(index)
raise apiproxy_errors.ApplicationError(
datastore_pb.Error.BAD_REQUEST, 'Index already exists.')
(collection, spec) = self.__collection_and_spec_for_index(index)
if spec: # otherwise it's probably an index w/ just an ancestor specifier
self.__db[collection].create_index(spec)
if self.__db.error():
raise apiproxy_errors.ApplicationError(
datastore_pb.Error.BAD_REQUEST,
'Error creating index. Maybe '
'too many indexes?')
# NOTE just give it a dummy id. we don't use these for anything...
id_response.set_value(1)
def _Dynamic_GetIndices(self, app_str, composite_indices):
if app_str.value() != self.__db.name():
raise apiproxy_errors.ApplicationError(
datastore_pb.Error.BAD_REQUEST,
'Getting indexes for a different '
'app unsupported.')
def from_index_name(name):
elements = name.split("_")
index = []
while len(elements):
if not elements[0]:
elements = elements[1:]
elements[0] = "_" + elements[0]
index.append((elements[0], int(elements[1])))
elements = elements[2:]
return index
for collection in self.__db.collection_names():
info = self.__db[collection].index_information()
for index in info.keys():
index_pb = entity_pb.CompositeIndex()
index_pb.set_app_id(self.__db.name())
index_pb.mutable_definition().set_entity_type(collection)
index_pb.mutable_definition().set_ancestor(False)
index_pb.set_state(2) # READ_WRITE
index_pb.set_id(1) # bogus id
for (k, v) in from_index_name(index):
if k == "_id":
k = "__key__"
p = index_pb.mutable_definition().add_property()
p.set_name(k)
p.set_direction(v == pymongo.ASCENDING and 1 or 2)
composite_indices.index_list().append(index_pb)
def _Dynamic_UpdateIndex(self, index, void):
logging.log(logging.WARN, 'update index unsupported')
def _Dynamic_DeleteIndex(self, index, void):
(collection, spec) = self.__collection_and_spec_for_index(index)
if not spec:
return
if not self.__has_index(index):
raise apiproxy_errors.ApplicationError(
datastore_pb.Error.BAD_REQUEST, "Index doesn't exist.")
self.__db[collection].drop_index(spec)
class DatastoreMongoStub(apiproxy_stub.APIProxyStub):
"""Persistent stub for the Python datastore API, using MongoDB to persist.
A DatastoreMongoStub instance handles a single app's data.
"""
def __init__(self,
app_id,
datastore_file,
require_indexes=False,
service_name='datastore_v3'):
"""Constructor.
Initializes the datastore stub.
Args:
app_id: string
datastore_file: ignored
require_indexes: bool, default False. If True, composite indexes must
exist in index.yaml for queries that need them.
service_name: Service name expected for all calls.
"""
super(DatastoreMongoStub, self).__init__(service_name)
assert isinstance(app_id, basestring) and app_id != ''
self.__app_id = app_id
self.__require_indexes = require_indexes
# TODO should be a way to configure the connection
self.__db = Connection()[app_id]
# NOTE our query history gets reset each time the server restarts...
# should this be fixed?
self.__query_history = {}
self.__next_index_id = 1
self.__indexes = {}
self.__index_lock = threading.Lock()
self.__cursor_lock = threading.Lock()
self.__next_cursor = 1
self.__queries = {}
def MakeSyncCall(self, service, call, request, response):
""" The main RPC entry point. service must be 'datastore_v3'. So far, the
supported calls are 'Get', 'Put', 'RunQuery', 'Next', and 'Count'.
"""
super(DatastoreMongoStub, self).MakeSyncCall(service, call, request,
response)
explanation = []
assert response.IsInitialized(explanation), explanation
def QueryHistory(self):
"""Returns a dict that maps Query PBs to times they've been run.
"""
return dict((pb, times) for pb, times in self.__query_history.items()
if pb.app() == self.__app_id)
def __collection_for_key(self, key):
return key.path().element(-1).type()
def __id_for_key(self, key):
db_path = []
def add_element_to_db_path(elem):
db_path.append(elem.type())
if elem.has_name():
db_path.append(elem.name())
else:
db_path.append("\t" + str(elem.id()))
for elem in key.path().element_list():
add_element_to_db_path(elem)
return "\10".join(db_path)
def __key_for_id(self, id):
def from_db(value):
if value.startswith("\t"):
return int(value[1:])
return value
return datastore_types.Key.from_path(
*[from_db(a) for a in id.split("\10")])
def __create_mongo_value_for_value(self, value):
if isinstance(value, datastore_types.Rating):
return {
'class': 'rating',
'rating': int(value),
}
if isinstance(value, datastore_types.Category):
return {
'class': 'category',
'category': str(value),
}
if isinstance(value, datastore_types.Key):
return {
'class': 'key',
'path': self.__id_for_key(value._ToPb()),
}
if isinstance(value, types.ListType):
list_for_db = [
self.__create_mongo_value_for_value(v) for v in value
]
sorted_list = sorted(value)
return {
'class':
'list',
'list':
list_for_db,
'ascending_sort_key':
self.__create_mongo_value_for_value(sorted_list[0]),
'descending_sort_key':
self.__create_mongo_value_for_value(sorted_list[-1]),
}
if isinstance(value, users.User):
return {
'class': 'user',
'email': value.email(),
}
if isinstance(value, datastore_types.Text):
return {
'class': 'text',
'string': unicode(value),
}
if isinstance(value, datastore_types.Blob):
return Binary(value)
if isinstance(value, datastore_types.ByteString):
return {'class': 'bytes', 'value': Binary(value)}
if isinstance(value, datastore_types.IM):
return {
'class': 'im',
'protocol': value.protocol,
'address': value.address,
}
if isinstance(value, datastore_types.GeoPt):
return {
'class': 'geopt',
'lat': value.lat,
'lon': value.lon,
}
if isinstance(value, datastore_types.Email):
return {
'class': 'email',
'value': value,
}
if isinstance(value, datastore_types.BlobKey):
return {
'class': 'blobkey',
'value': value,
}
return value
def __create_value_for_mongo_value(self, mongo_value):
if isinstance(mongo_value, Binary):
return datastore_types.Blob(str(mongo_value))
if isinstance(mongo_value, types.DictType):
if mongo_value['class'] == 'rating':
return datastore_types.Rating(int(mongo_value["rating"]))
if mongo_value['class'] == 'category':
return datastore_types.Category(mongo_value["category"])
if mongo_value['class'] == 'key':
return self.__key_for_id(mongo_value['path'])
if mongo_value['class'] == 'list':
return [
self.__create_value_for_mongo_value(v)
for v in mongo_value['list']
]
if mongo_value['class'] == 'user':
return users.User(email=mongo_value["email"])
if mongo_value['class'] == 'text':
return datastore_types.Text(mongo_value['string'])
if mongo_value['class'] == 'im':
return datastore_types.IM(mongo_value['protocol'],
mongo_value['address'])
if mongo_value['class'] == 'geopt':
return datastore_types.GeoPt(mongo_value['lat'],
mongo_value['lon'])
if mongo_value['class'] == 'email':
return datastore_types.Email(mongo_value['value'])
if mongo_value['class'] == 'bytes':
return datastore_types.ByteString(mongo_value['value'])
if mongo_value['class'] == 'blobkey':
return datastore_types.BlobKey(mongo_value['value'])
return mongo_value
def __mongo_document_for_entity(self, entity):
document = {}
document["_id"] = self.__id_for_key(entity.key())
entity = datastore.Entity._FromPb(entity)
for (k, v) in entity.iteritems():
v = self.__create_mongo_value_for_value(v)
document[k] = v
return document
def __entity_for_mongo_document(self, document):
key = self.__key_for_id(document.pop("_id"))
entity = datastore.Entity(kind=key.kind(),
parent=key.parent(),
name=key.name())
for k in document.keys():
v = self.__create_value_for_mongo_value(document[k])
entity[k] = v
pb = entity._ToPb()
# no decent way to initialize an Entity w/ an existing key...
if not key.name():
pb.key().path().element_list()[-1].set_id(key.id())
return pb
def _Dynamic_Put(self, put_request, put_response):
for entity in put_request.entity_list():
clone = entity_pb.EntityProto()
clone.CopyFrom(entity)
assert clone.has_key()
assert clone.key().path().element_size() > 0
last_path = clone.key().path().element_list()[-1]
if last_path.id() == 0 and not last_path.has_name():
# HACK just using a random id...
last_path.set_id(random.randint(-sys.maxint - 1, sys.maxint))
assert clone.entity_group().element_size() == 0
group = clone.mutable_entity_group()
root = clone.key().path().element(0)
group.add_element().CopyFrom(root)
else:
assert (clone.has_entity_group()
and clone.entity_group().element_size() > 0)
collection = self.__collection_for_key(clone.key())
document = self.__mongo_document_for_entity(clone)
id = self.__db[collection].save(document)
put_response.key_list().append(self.__key_for_id(id)._ToPb())
def _Dynamic_Get(self, get_request, get_response):
for key in get_request.key_list():
collection = self.__collection_for_key(key)
id = self.__id_for_key(key)
group = get_response.add_entity()
document = self.__db[collection].find_one({"_id": id})
if document is None:
entity = None
else:
entity = self.__entity_for_mongo_document(document)
if entity:
group.mutable_entity().CopyFrom(entity)
def _Dynamic_Delete(self, delete_request, delete_response):
for key in delete_request.key_list():
collection = self.__collection_for_key(key)
id = self.__id_for_key(key)
self.__db[collection].remove({"_id": id})
def __special_props(self, value, direction):
if isinstance(value, datastore_types.Category):
return ["category"]
if isinstance(value, datastore_types.GeoPt):
return ["lat", "lon"]
if isinstance(value, list):
if direction == pymongo.ASCENDING:
return ["ascending_sort_key"]
return ["descending_sort_key"]
return None
def __unorderable(self, value):
if isinstance(value, datastore_types.Text):
return True
if isinstance(value, datastore_types.Blob):
return True
return False
def __translate_order_for_mongo(self, order_list, prototype):
mongo_ordering = []
for o in order_list:
key = o.property().decode('utf-8')
value = pymongo.ASCENDING
if o.direction() is datastore_pb.Query_Order.DESCENDING:
value = pymongo.DESCENDING
if key == "__key__":
key = "_id"
mongo_ordering.append((key, value))
continue
if key not in prototype or self.__unorderable(prototype[key]):
return None
props = self.__special_props(prototype[key], value)
if props:
for prop in props:
mongo_ordering.append((key + "." + prop, value))
else:
mongo_ordering.append((key, value))
return mongo_ordering
def __filter_suffix(self, value):
if isinstance(value, types.ListType):
return ".list"
return ""
def __filter_binding(self, key, value, operation, prototype):
if key in prototype:
key += self.__filter_suffix(prototype[key])
if key == "__key__":
key = "_id"
value = self.__id_for_key(value._ToPb())
else:
value = self.__create_mongo_value_for_value(value)
if operation == "<":
return (key, {'$lt': value})
elif operation == '<=':
return (key, {'$lte': value})
elif operation == '>':
return (key, {'$gt': value})
elif operation == '>=':
return (key, {'$gte': value})
elif operation == '==':
return (key, value)
raise apiproxy_errors.ApplicationError(
datastore_pb.Error.BAD_REQUEST,
"Can't handle operation %r." % operation)
def _Dynamic_RunQuery(self, query, query_result):
if query.has_offset() and query.offset() > _MAX_QUERY_OFFSET:
raise apiproxy_errors.ApplicationError(
datastore_pb.Error.BAD_REQUEST, 'Too big query offset.')
if query.keys_only():
query_result.set_keys_only(True)
num_components = len(query.filter_list()) + len(query.order_list())
if query.has_ancestor():
num_components += 1
if num_components > _MAX_QUERY_COMPONENTS:
raise apiproxy_errors.ApplicationError(
datastore_pb.Error.BAD_REQUEST,
('query is too large. may not have more than %s filters'
' + sort orders ancestor total' % _MAX_QUERY_COMPONENTS))
app = query.app()
query_result.mutable_cursor().set_cursor(0)
query_result.set_more_results(False)
if self.__require_indexes:
required, kind, ancestor, props, num_eq_filters = datastore_index.CompositeIndexForQuery(
query)
if required:
index = entity_pb.CompositeIndex()
index.mutable_definition().set_entity_type(kind)
index.mutable_definition().set_ancestor(ancestor)
for (k, v) in props:
p = index.mutable_definition().add_property()
p.set_name(k)
p.set_direction(v)
if props and not self.__has_index(index):
raise apiproxy_errors.ApplicationError(
datastore_pb.Error.NEED_INDEX,
"This query requires a composite index that is not defined. "
"You must update the index.yaml file in your application root."
)
collection = query.kind()
clone = datastore_pb.Query()
clone.CopyFrom(query)
clone.clear_hint()
if clone in self.__query_history:
self.__query_history[clone] += 1
else:
self.__query_history[clone] = 1
# HACK we need to get one Entity from this collection so we know what the
# property types are (because we need to construct queries that depend on
# the types of the properties)...
prototype = self.__db[collection].find_one()
if prototype is None:
return
prototype = datastore.Entity._FromPb(
self.__entity_for_mongo_document(prototype))
spec = {}
if query.has_ancestor():
spec["_id"] = re.compile("^%s.*$" %
self.__id_for_key(query.ancestor()))
operators = {
datastore_pb.Query_Filter.LESS_THAN: '<',
datastore_pb.Query_Filter.LESS_THAN_OR_EQUAL: '<=',
datastore_pb.Query_Filter.GREATER_THAN: '>',
datastore_pb.Query_Filter.GREATER_THAN_OR_EQUAL: '>=',
datastore_pb.Query_Filter.EQUAL: '==',
}
for filt in query.filter_list():
assert filt.op() != datastore_pb.Query_Filter.IN
prop = filt.property(0).name().decode('utf-8')
op = operators[filt.op()]
filter_val_list = [
datastore_types.FromPropertyPb(filter_prop)
for filter_prop in filt.property_list()
]
(key, value) = self.__filter_binding(prop, filter_val_list[0], op,
prototype)
if key in spec:
if not isinstance(spec[key],
types.DictType) and not isinstance(
value, types.DictType):
if spec[key] != value:
return
elif not isinstance(spec[key], types.DictType):
value["$in"] = [spec[key]]
spec[key] = value
elif not isinstance(value, types.DictType):
spec[key]["$in"] = [value]
else:
spec[key].update(value)
else:
spec[key] = value
cursor = self.__db[collection].find(spec)
order = self.__translate_order_for_mongo(query.order_list(), prototype)
if order is None:
return
if order:
cursor = cursor.sort(order)
if query.has_offset():
cursor = cursor.skip(query.offset())
if query.has_limit():
cursor = cursor.limit(query.limit())
self.__cursor_lock.acquire()
cursor_index = self.__next_cursor
self.__next_cursor += 1
self.__cursor_lock.release()
self.__queries[cursor_index] = cursor
query_result.mutable_cursor().set_cursor(cursor_index)
query_result.set_more_results(True)
def _Dynamic_Next(self, next_request, query_result):
cursor = next_request.cursor().cursor()
query_result.set_more_results(False)
if cursor == 0: # we exited early from the query w/ no results...
return
try:
cursor = self.__queries[cursor]
except KeyError:
raise apiproxy_errors.ApplicationError(
datastore_pb.Error.BAD_REQUEST, 'Cursor %d not found' % cursor)
count = next_request.count()
if count == 0:
count = 1
for _ in range(count):
try:
query_result.result_list().append(
self.__entity_for_mongo_document(cursor.next()))
except StopIteration:
return
query_result.set_more_results(True)
def _Dynamic_Count(self, query, integer64proto):
query_result = datastore_pb.QueryResult()
self._Dynamic_RunQuery(query, query_result)
cursor_number = query_result.cursor().cursor()
if cursor_number == 0: # we exited early from the query w/ no results...
integer64proto.set_value(0)
else:
cursor = self.__queries[cursor_number]
count = cursor.count()
del self.__queries[cursor_number]
if query.has_limit() and count > query.limit():
count = query.limit()
integer64proto.set_value(count)
def _Dynamic_BeginTransaction(self, request, transaction):
transaction.set_handle(0)
logging.log(logging.WARN, 'transactions unsupported')
def _Dynamic_Commit(self, transaction, transaction_response):
logging.log(logging.WARN, 'transactions unsupported')
def _Dynamic_Rollback(self, transaction, transaction_response):
logging.log(logging.WARN, 'transactions unsupported')
def _Dynamic_GetSchema(self, app_str, schema):
# TODO this is used for the admin viewer to introspect.
pass
def _Dynamic_AllocateIds(self, allocate_ids_request,
allocate_ids_response):
logging.log(logging.WARN, 'pre-allocating IDs unsupported')
def __collection_and_spec_for_index(self, index):
def translate_name(ae_name):
if ae_name == "__key__":
return "_id"
return ae_name
def translate_direction(ae_dir):
if ae_dir == 1:
return pymongo.ASCENDING
elif ae_dir == 2:
return pymongo.DESCENDING
raise apiproxy_errors.ApplicationError(
datastore_pb.Error.BAD_REQUEST, 'Weird direction.')
collection = index.definition().entity_type()
spec = []
for prop in index.definition().property_list():
spec.append((translate_name(prop.name()),
translate_direction(prop.direction())))
return (collection, spec)
def __has_index(self, index):
(collection, spec) = self.__collection_and_spec_for_index(index)
if self.__db[collection]._gen_index_name(
spec) in self.__db[collection].index_information().keys():
return True
return False
def _Dynamic_CreateIndex(self, index, id_response):
if index.id() != 0:
raise apiproxy_errors.ApplicationError(
datastore_pb.Error.BAD_REQUEST, 'New index id must be 0.')
elif self.__has_index(index):
logging.getLogger().info(index)
raise apiproxy_errors.ApplicationError(
datastore_pb.Error.BAD_REQUEST, 'Index already exists.')
(collection, spec) = self.__collection_and_spec_for_index(index)
if spec: # otherwise it's probably an index w/ just an ancestor specifier
self.__db[collection].create_index(spec)
if self.__db.error():
raise apiproxy_errors.ApplicationError(
datastore_pb.Error.BAD_REQUEST,
"Error creating index. Maybe too many indexes?")
# NOTE just give it a dummy id. we don't use these for anything...
id_response.set_value(1)
def _Dynamic_GetIndices(self, app_str, composite_indices):
if app_str.value() != self.__db.name():
raise apiproxy_errors.ApplicationError(
datastore_pb.Error.BAD_REQUEST,
"Getting indexes for a different app unsupported.")
def from_index_name(name):
elements = name.split("_")
index = []
while len(elements):
if not elements[0]:
elements = elements[1:]
elements[0] = "_" + elements[0]
index.append((elements[0], int(elements[1])))
elements = elements[2:]
return index
for collection in self.__db.collection_names():
info = self.__db[collection].index_information()
for index in info.keys():
index_pb = entity_pb.CompositeIndex()
index_pb.set_app_id(self.__db.name())
index_pb.mutable_definition().set_entity_type(collection)
index_pb.mutable_definition().set_ancestor(False)
index_pb.set_state(2) # READ_WRITE
index_pb.set_id(1) # bogus id
for (k, v) in from_index_name(index):
if k == "_id":
k = "__key__"
p = index_pb.mutable_definition().add_property()
p.set_name(k)
p.set_direction(v == pymongo.ASCENDING and 1 or 2)
composite_indices.index_list().append(index_pb)
def _Dynamic_UpdateIndex(self, index, void):
logging.log(logging.WARN, 'update index unsupported')
def _Dynamic_DeleteIndex(self, index, void):
(collection, spec) = self.__collection_and_spec_for_index(index)
if not spec:
return
if not self.__has_index(index):
raise apiproxy_errors.ApplicationError(
datastore_pb.Error.BAD_REQUEST, "Index doesn't exist.")
self.__db[collection].drop_index(spec)