tools/bin/gppylib/operations/test_utils_helper.py

# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements.  See the NOTICE file
# distributed with this work for additional information
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# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License.  You may obtain a copy of the License at
# 
#   http://www.apache.org/licenses/LICENSE-2.0
# 
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied.  See the License for the
# specific language governing permissions and limitations
# under the License.
from gppylib.operations import Operation

"""
These objects needed for gppylib.operations.test.test_utils are pulled out of said file for
pickle/import/visibility reasons. See gppylib.operations.utils.RemoteOperation, #4.
"""

class TestOperation(Operation):
    def execute(self):
        return 1

class MyException(Exception): pass
class RaiseOperation(Operation):
    def execute(self):
        raise MyException()

# Exceptions cannot be nested. 
# They cannot be pickled for reasons inherent to python. See utils.py
class RaiseOperation_Nested(Operation):
    def execute(self):
        raise RaiseOperation_Nested.MyException2()
    class MyException2(Exception): pass

# Exceptions with args must follow a strange idiom! http://bugs.python.org/issue1692335
class RaiseOperation_Unsafe(Operation):
    def execute(self):
        raise ExceptionWithArgsUnsafe(1, 2)

class RaiseOperation_Safe(Operation):
    def execute(self):
        raise ExceptionWithArgs(1, 2)

# This is the proper idiom for a pickle-able exception with arguments: http://bugs.python.org/issue1692335
class ExceptionWithArgs(Exception):
    def __init__(self, x, y):
        self.x, self.y = x, y
        Exception.__init__(self, x, y)

class ExceptionWithArgsUnsafe(Exception):
    def __init__(self, x, y):
        self.x, self.y = x, y

class RaiseOperation_Unpicklable(Operation):
    def execute(self):
        from pygresql import pg
        raise pg.DatabaseError()