class RepresentationTest(IonIntegrationTestCase):
def setUp(self):
self.subject = IonSerializerDictionaryRepresentation(id_factory=SaltedTimeIDFactory())
def test_encode_decode(self):
obj = IonObject(RT.InstrumentDevice, name='SBE37IMDevice', description="SBE37IMDevice", serial_number="12345" )
d = self.subject.encode(obj)
print 'keys: ' + repr(d)
self.assertFalse('_id' in d.keys())
new_obj = self.subject.decode(d)
self.assertEqual(obj, new_obj)
d2 = self.subject.encode(new_obj, add_id=True)
self.assertTrue('_id' in d2.keys(), msg=repr(d2.keys()))
# retains key once added
d3 = self.subject.encode(self.subject.decode(d2))
self.assertTrue('_id' in d3.keys())
def test_fails(self):
d = {}
try:
self.subject.decode(d)
self.fail('should not have worked')
except:
pass
obj = IonObject(RT.InstrumentDevice, name='SBE37IMDevice', description="SBE37IMDevice", serial_number="12345" )
d2 = self.subject.encode(obj)
d2['more']='stuff'
try:
self.subject.decode(d2)
self.fail('should not be able to decode')
except:
pass
class Repository(object):
def __init__(self, pools, representation=None):
self._pool = pools
if representation:
self._representation = representation
else:
self._id_factory = SaltedTimeIDFactory()
self._representation = IonSerializerDictionaryRepresentation(id_factory=self._id_factory)
def close(self):
for pool in self._pool.values():
pool.close(op=self._close_connection)
def _close_connection(self, connection):
connection.close()
#############################
def _validate_object(self, arg):
''' check that arg is IonObject or list of IonObjects '''
if isinstance(arg, IonObjectBase):
return
if isinstance(arg, list) and len(arg) and all([isinstance(o, IonObjectBase) for o in arg]):
return
raise BadRequest('invalid repository entry type ' + arg.__class__.__name__ + ': ' + repr(arg))
def _validate_object_or_id(self, arg):
''' collection of IDs is valid, otherwise check for valid IonObject(s) '''
if isinstance(arg, str):
return
if isinstance(arg, list) and len(arg) and all([isinstance(id, str) for id in arg]):
return
self._validate_object(arg)
def _is_id(self, arg):
return isinstance(arg, str) or (isinstance(arg, list) and isinstance(arg[0], str))
#############################
#
# CRUD operations delegate to datastore
# all use _perform for consistency:
# - check argument for allowed types argect, id, list of objects or list of ids
# - get pooled datastore instance
# - perform operation, notify of any non-application exceptions
# - return connection to pool
def insert(self, store, arg, _connection=None, **kw):
""" insert one or more IonObjects into the DB
return value is one/list of triples (success, id, exception)
indicating success or failure per insert
"""
if not _connection:
self._validate_object(arg)
encoded = self._encode(arg, add_id=True)
return self._perform(self.insert, store, encoded)
return _connection.insert(arg, **kw)
def update(self, store, arg, _connection=None, **kw):
""" update one or more IonObjects
return value is one/list of triples (success, id, exception)
indicating success or failure per insert
"""
if not _connection:
self._validate_object(arg)
return self._perform(self.update, store, self._encode(arg))
return _connection.update(arg, **kw)
def read(self, store, arg, _connection=None, **kw):
""" read one or more IonObjects from the DB
arg may be IonObject(s) (which will be updated)
or if type is provided, id(s)
returns one/list of tuples (success, id, IonObject or exception)
"""
if not _connection:
self._validate_object_or_id(arg)
return self._perform(self.read, store, self._encode_or_id(arg))
return self._decode(_connection.read(arg, **kw))
def delete(self, store, arg, _connection=None, **kw):
""" delete one or more objects from the DB
arg may be IonObject(s), or if type is provided, id(s)
return value is one/list of triples (success, id, exception)
indicating success or failure per insert
"""
if not _connection:
self._validate_object_or_id(arg)
return self._perform(self.delete, store, self._encode_or_id(arg))
return _connection.delete(arg, **kw)
def _encode_or_id(self, arg):
if self._is_id(arg):
return arg
else:
return self._encode(arg)
def _encode(self, arg, add_id=False):
if isinstance(arg, list):
return [ self._encode(o, add_id=add_id) for o in arg ]
return self._representation.encode(arg, add_id=add_id)
def _decode(self, arg):
if isinstance(arg, list):
return [ self._decode(d) for d in arg ]
if isinstance(arg, tuple):
return arg[0], arg[1], self._decode(arg[2])
if isinstance(arg, Exception):
return arg
return self._representation.decode(arg)
def _perform(self, op, store, *args, **kwargs):
""" re-invoke the calling operation with a pooled DB connection """
pool = self._pool[store]
connection = pool.check_out()
if not connection:
raise ServerError('failed to get a connection for store: ' + store)
try:
return op(store, *args, _connection=connection, **kwargs)
except IonException:
raise
except:
# should have been rethrown as application exception by store, find and fix these occurrences...
log.error('unexpected exception from datastore', exc_info=True)
raise
finally:
pool.check_in(connection)
#############################
#
# NOT YET IMPLEMENTED
def create_association(self, subject=None, predicate=None, arg=None, assoc_type=AT.H2H):
pass
def delete_association(self, association=''):
pass
def find_objects(self, subject, predicate="", object_type="", id_only=False):
pass
def find_subjects(self, subject_type="", predicate="", obj="", id_only=False):
pass
def find_associations(self, subject="", predicate="", obj="", assoc_type=AT.H2H, id_only=True):
pass
def find_resources(self, restype="", lcstate="", name="", id_only=True):
pass