def test_save_set_only(engine, session):
user = User(id="user_id")
# Expect a SET on email
user.email = "*****@*****.**"
expected = {
"Key": {
"id": {
"S": user.id
}
},
"ExpressionAttributeNames": {
"#n0": "email"
},
"TableName": "User",
"ReturnValues": "NONE",
"UpdateExpression": "SET #n0=:v1",
"ExpressionAttributeValues": {
":v1": {
"S": "*****@*****.**"
}
}
}
engine.save(user)
session.save_item.assert_called_once_with(expected)
def wx(engine):
"""prepared write tx with one item"""
user = User(id="numberoverzero")
other = User(id="other")
items = [
TxItem.new("save", user, condition=User.id.is_(None)),
TxItem.new("delete", other),
TxItem.new("check", other, condition=User.email.begins_with("foo"))
]
tx = PreparedTransaction()
tx.prepare(engine, "w", items)
return tx
def test_load_objects(engine, session):
user1 = User(id="user1")
user2 = User(id="user2")
expected = {
"User": {
"Keys": [{
"id": {
"S": "user1"
}
}, {
"id": {
"S": "user2"
}
}],
"ConsistentRead": False
}
}
response = {
"User": [{
"age": {
"N": 5
},
"name": {
"S": "foo"
},
"id": {
"S": "user1"
}
}, {
"age": {
"N": 10
},
"name": {
"S": "bar"
},
"id": {
"S": "user2"
}
}]
}
def respond(RequestItems):
assert ordered(RequestItems) == ordered(expected)
return response
session.load_items.side_effect = respond
engine.load(user1, user2)
assert user1.age == 5
assert user1.name == "foo"
assert user2.age == 10
assert user2.name == "bar"
def test_delete_atomic(engine, session):
user = User(id="user_id")
# Tell the tracking system the user's id was saved to DynamoDB
object_saved.send(engine, engine=engine, obj=user)
expected = {
"ConditionExpression": "(#n0 = :v1)",
"ExpressionAttributeValues": {
":v1": {
"S": user.id
}
},
"TableName": "User",
"ReturnValues": "NONE",
"Key": {
"id": {
"S": user.id
}
},
"ExpressionAttributeNames": {
"#n0": "id"
}
}
engine.delete(user, atomic=True)
session.delete_item.assert_called_once_with(expected)
def rx(engine):
"""prepared read tx with one item"""
user = User(id="numberoverzero")
items = [TxItem.new("get", user)]
tx = PreparedTransaction()
tx.prepare(engine, "r", items)
return tx
def test_delete_multiple_condition(engine, session, caplog):
users = [User(id=str(i)) for i in range(3)]
condition = User.id == "foo"
expected_calls = [{
"Key": {
"id": {
"S": user.id
}
},
"ExpressionAttributeValues": {
":v1": {
"S": "foo"
}
},
"ExpressionAttributeNames": {
"#n0": "id"
},
"ConditionExpression": "(#n0 = :v1)",
"TableName": "User",
"ReturnValues": "NONE",
} for user in users]
engine.delete(*users, condition=condition)
for expected in expected_calls:
session.delete_item.assert_any_call(expected)
assert session.delete_item.call_count == 3
assert caplog.record_tuples[-1] == ("bloop.engine", logging.INFO,
"successfully deleted 3 objects")
def test_delete_atomic_condition(engine, session):
user = User(id="user_id", email="*****@*****.**")
# Tell the tracking system the user's id and email were saved to DynamoDB
object_saved.send(engine, engine=engine, obj=user)
expected = {
"ConditionExpression": "((#n0 = :v1) AND (#n2 = :v3) AND (#n4 = :v5))",
"ExpressionAttributeValues": {
":v1": {
"S": "foo"
},
":v3": {
"S": "*****@*****.**"
},
":v5": {
"S": user.id
}
},
"ExpressionAttributeNames": {
"#n0": "name",
"#n2": "email",
"#n4": "id"
},
"Key": {
"id": {
"S": user.id
}
},
"TableName": "User",
"ReturnValues": "NONE",
}
engine.delete(user, condition=User.name.is_("foo"), atomic=True)
session.delete_item.assert_called_once_with(expected)
def test_delete_atomic_new(engine, session):
"""atomic delete on new object should expect no columns to exist"""
user = User(id="user_id")
expected = {
"TableName":
"User",
"ReturnValues":
"NONE",
"ExpressionAttributeNames": {
"#n4": "id",
"#n0": "age",
"#n8": "name",
"#n6": "j",
"#n2": "email"
},
"Key": {
"id": {
"S": user.id
}
},
"ConditionExpression":
("((attribute_not_exists(#n0)) AND (attribute_not_exists(#n2)) "
"AND (attribute_not_exists(#n4)) AND (attribute_not_exists(#n6))"
" AND (attribute_not_exists(#n8)))")
}
engine.delete(user, atomic=True)
session.delete_item.assert_called_once_with(expected)
def test_save_twice(engine, session):
"""Save sends full local values, not just deltas from last save"""
user = User(id="user_id", age=5)
expected = {
"Key": {
"id": {
"S": user.id
}
},
"TableName": "User",
"ReturnValues": "NONE",
"ExpressionAttributeNames": {
"#n0": "age"
},
"ExpressionAttributeValues": {
":v1": {
"N": "5"
}
},
"UpdateExpression": "SET #n0=:v1",
}
engine.save(user)
engine.save(user)
session.save_item.assert_called_with(expected)
assert session.save_item.call_count == 2
def test_dump_key(engine):
user = User(id="foo")
user_key = {"id": {"S": "foo"}}
assert dump_key(engine, user) == user_key
obj = HashAndRange(foo=4, bar=5)
obj_key = {"bar": {"N": "5"}, "foo": {"N": "4"}}
assert dump_key(engine, obj) == obj_key
def test_read_item(engine):
engine.bind(User)
user = User(id="numberoverzero")
tx = ReadTransaction(engine)
tx.load(user)
p = tx.prepare()
expected_items = [TxItem.new("get", user, None, False)]
assert tx._items == expected_items
assert p.items == expected_items
assert p.first_commit_at is None
def test_load_missing_attrs(engine, session):
"""When an instance of a Model is loaded into, existing attributes should be
overwritten with new values, or if there is no new value, should be deleted
"""
obj = User(id="user_id", age=4, name="user")
response = {"User": [{"age": {"N": 5}, "id": {"S": obj.id}}]}
session.load_items.return_value = response
engine.load(obj)
assert obj.age == 5
assert obj.name == ""
def test_load_equivalent_objects(engine, session):
"""Two objects with the same key are both loaded"""
user = User(id="user_id")
same_user = User(id=user.id)
expected = {
"User": {
"Keys": [{
"id": {
"S": user.id
}
}],
"ConsistentRead": False
}
}
response = {
"User": [{
"age": {
"N": 5
},
"name": {
"S": "foo"
},
"id": {
"S": user.id
}
}]
}
def respond(RequestItems):
assert ordered(RequestItems) == ordered(expected)
return response
session.load_items.side_effect = respond
engine.load(user, same_user)
assert user.age == 5
assert user.name == "foo"
assert same_user.age == 5
assert same_user.name == "foo"
def test_missing_objects(engine, session, caplog):
"""When objects aren't loaded, MissingObjects is raised with a list of missing objects"""
# Patch batch_get_items to return no results
session.load_items.return_value = {}
users = [User(id=str(i)) for i in range(3)]
with pytest.raises(MissingObjects) as excinfo:
engine.load(*users)
assert set(excinfo.value.objects) == set(users)
assert caplog.record_tuples == [("bloop.engine", logging.INFO,
"loaded 0 of 3 objects")]
def test_delete_new(engine, session):
"""When an object is first created, a non-atomic delete shouldn't expect anything."""
user = User(id="user_id")
expected = {
"TableName": "User",
"ReturnValues": "NONE",
"Key": {
"id": {
"S": user.id
}
}
}
engine.delete(user)
session.delete_item.assert_called_once_with(expected)
def test_dump_key(engine):
class HashAndRange(BaseModel):
foo = Column(Integer, hash_key=True)
bar = Column(Integer, range_key=True)
engine.bind(HashAndRange)
user = User(id="foo")
user_key = {"id": {"S": "foo"}}
assert dump_key(engine, user) == user_key
obj = HashAndRange(foo=4, bar=5)
obj_key = {"bar": {"N": "5"}, "foo": {"N": "4"}}
assert dump_key(engine, obj) == obj_key
def test_load_missing_key(engine):
"""Trying to load objects with missing hash and range keys raises"""
user = User(age=2)
with pytest.raises(MissingKey):
engine.load(user)
complex_models = [
ComplexModel(),
ComplexModel(name=uuid.uuid4()),
ComplexModel(date="no hash")
]
for model in complex_models:
with pytest.raises(MissingKey):
engine.load(model)
def test_save_atomic_condition(engine, session):
user = User(id="user_id")
# Tell the tracking system the user's id was saved to DynamoDB
object_saved.send(engine, engine=engine, obj=user)
# Mutate a field; part of the update but not an expected condition
user.name = "new_foo"
# Condition on the mutated field with a different value
condition = User.name == "expect_foo"
expected = {
"ConditionExpression": "((#n0 = :v1) AND (#n2 = :v3))",
"ExpressionAttributeNames": {
"#n0": "name",
"#n2": "id"
},
"ExpressionAttributeValues": {
":v1": {
"S": "expect_foo"
},
":v3": {
"S": user.id
},
":v4": {
"S": "new_foo"
}
},
"Key": {
"id": {
"S": user.id
}
},
"TableName": "User",
"ReturnValues": "NONE",
"UpdateExpression": "SET #n0=:v4"
}
engine.save(user, condition=condition, atomic=True)
session.save_item.assert_called_once_with(expected)
def test_abstract_object_operations_raise(engine, op_name, plural):
class Abstract(BaseModel):
class Meta:
abstract = True
engine.bind(Abstract)
abstract = Abstract(id=5)
concrete = User(age=5)
with pytest.raises(InvalidModel):
operation = getattr(engine, op_name)
operation(abstract)
if plural:
with pytest.raises(InvalidModel):
operation = getattr(engine, op_name)
operation(abstract, concrete)
def test_save_single_with_condition(engine, session):
user = User(id="user_id")
condition = User.id.is_(None)
expected = {
"TableName": "User",
"ReturnValues": "NONE",
"ExpressionAttributeNames": {
"#n0": "id"
},
"ConditionExpression": "(attribute_not_exists(#n0))",
"Key": {
"id": {
"S": user.id
}
}
}
engine.save(user, condition=condition)
session.save_item.assert_called_once_with(expected)
def test_delete_sync(engine, session):
"""Engine.delete(sync='old') the previous values should be loaded and the object should be marked dirty"""
session.delete_item.return_value = {
"id": {
"S": "user_id"
},
"age": {
"N": "3"
}
}
user = User(id="user_id", age=4)
engine.delete(user, sync="old")
assert user.age == 3
assert global_tracking.get_snapshot(user) == (User.age.is_(None)
& User.email.is_(None)
& User.id.is_(None)
& User.joined.is_(None)
& User.name.is_(None))
def test_save_sync(engine, session, sync):
"""Engine.save(sync='old'|'new') the returned values should be loaded and the object should not be marked dirty"""
session.save_item.return_value = {
"id": {
"S": "user_id"
},
"age": {
"N": "3"
}
}
user = User(id="user_id", age=4)
engine.save(user, sync=sync)
assert user.age == 3
assert global_tracking.get_snapshot(user) == (
User.age.is_({"N": "3"}) & User.email.is_(None)
& User.id.is_({"S": "user_id"}) & User.joined.is_(None)
& User.name.is_(None))
def test_delete_complex_item(engine):
engine.bind(User)
user = User(id="numberoverzero")
tx = WriteTransaction(engine)
condition = User.id.begins_with("foo")
tx.delete(user, condition=condition, atomic=True)
p = tx.prepare()
expected_items = [TxItem.new("delete", user, condition, True)]
assert tx._items == expected_items
assert p.items == expected_items
assert p.first_commit_at is None
assert len(p._request) == 1
entry = p._request[0]["Delete"]
expected_fields = {
"Key", "TableName", "ConditionExpression", "ExpressionAttributeNames",
"ExpressionAttributeValues"
}
assert set(entry.keys()) == expected_fields
def test_save_del_only(engine, session):
user = User(id="user_id", age=4)
# Expect a REMOVE on age
del user.age
expected = {
"Key": {
"id": {
"S": user.id
}
},
"ExpressionAttributeNames": {
"#n0": "age"
},
"TableName": "User",
"ReturnValues": "NONE",
"UpdateExpression": "REMOVE #n0"
}
engine.save(user)
session.save_item.assert_called_once_with(expected)
def test_save_condition_key_only(engine, session):
"""Even when the diff is empty, an UpdateItem should be issued
(in case this is really a create - the item doesn't exist yet)
"""
user = User(id="user_id")
condition = User.id.is_(None)
expected = {
"ConditionExpression": "(attribute_not_exists(#n0))",
"TableName": "User",
"ReturnValues": "NONE",
"ExpressionAttributeNames": {
"#n0": "id"
},
"Key": {
"id": {
"S": user.id
}
}
}
engine.save(user, condition=condition)
session.save_item.assert_called_once_with(expected)
def test_save_list_with_condition(engine, session, caplog):
users = [User(id=str(i)) for i in range(3)]
condition = User.id.is_(None)
expected_calls = [{
"ConditionExpression": "(attribute_not_exists(#n0))",
"ExpressionAttributeNames": {
"#n0": "id"
},
"Key": {
"id": {
"S": user.id
}
},
"TableName": "User",
"ReturnValues": "NONE",
} for user in users]
engine.save(*users, condition=condition)
for expected in expected_calls:
session.save_item.assert_any_call(expected)
assert session.save_item.call_count == 3
assert caplog.record_tuples[-1] == ("bloop.engine", logging.INFO,
"successfully saved 3 objects")
def test_load_object(engine, session):
user_id = "user_id"
expected = {
"User": {
"Keys": [{
"id": {
"S": "user_id"
}
}],
"ConsistentRead": True
}
}
response = {
"User": [{
"age": {
"N": 5
},
"name": {
"S": "foo"
},
"id": {
"S": "user_id"
}
}]
}
def respond(RequestItems):
assert RequestItems == expected
return response
session.load_items.side_effect = respond
user = User(id=user_id)
engine.load(user, consistent=True)
assert user.age == 5
assert user.name == "foo"
assert user.id == user_id
def test_load_repeated_objects(engine, session):
"""The same object is only loaded once"""
user = User(id="user_id")
expected = {
"User": {
"Keys": [{
"id": {
"S": user.id
}
}],
"ConsistentRead": False
}
}
response = {
"User": [{
"age": {
"N": 5
},
"name": {
"S": "foo"
},
"id": {
"S": user.id
}
}],
}
def respond(RequestItems):
assert ordered(RequestItems) == ordered(expected)
return response
session.load_items.side_effect = respond
engine.load(user, user)
assert user.age == 5
assert user.name == "foo"
def test_delete_unknown_sync(engine, sync):
user = User(id="user_id", age=4)
with pytest.raises(ValueError):
engine.delete(user, sync=sync)
