# Copyright 2021 Google LLC
#
# Licensed 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
#
#     https://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.

# utils.py contains utility functions shared between modules

import asyncio
from functools import partial, wraps
from enum import Enum
from abc import ABC, abstractmethod


def async_wrap(func):
    """Wrapper function to turn synchronous functions into async functions.

    Args:
        func: Synchronous function to wrap.
    """

    @wraps(func)
    async def run(*args, loop=None, executor=None, **kwargs):
        if loop is None:
            loop = asyncio.get_event_loop()
        pfunc = partial(func, *args, **kwargs)
        return await loop.run_in_executor(executor, pfunc)

    return run


class DatabaseVersion(Enum):
    """Enum class for database version.

    All supported database versions for service."""

    MYSQL_8_0 = "MYSQL_8_0"
    POSTGRES_13 = "POSTGRES_13"
    POSTGRES_12 = "POSTGRES_12"
    POSTGRES_11 = "POSTGRES_11"
    POSTGRES_10 = "POSTGRES_10"
    POSTGRES_9_6 = "POSTGRES_9_6"

    def is_mysql(self):
        """Helper method to determine if database is MySQL dialect."""

        return self.value.startswith("MYSQL")

    def is_postgres(self):
        """Helper method to determine if database is PostgreSQL dialect."""

        return self.value.startswith("POSTGRES")


class RoleService(ABC):
    """Interface for managing a database and it's group roles.

    This interface lays out the required methods for subclasses to implement.
    Ex. MysqlRoleService subclass would implement the methods below for MySQL."""

    @abstractmethod
    def __init__(self, db):
        pass

    @abstractmethod
    def fetch_role_grants(self, group_name):
        pass

    @abstractmethod
    def create_group_role(self, role):
        pass

    @abstractmethod
    def grant_group_role(self, role, users):
        pass

    @abstractmethod
    def revoke_group_role(self, role, users):
        pass

# Copyright 2021 Google LLC
#
# Licensed 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
#
#     https://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.

# utils.py contains utility functions shared between modules

import asyncio
from functools import partial, wraps
from enum import Enum
from abc import ABC, abstractmethod


def async_wrap(func):
    """Wrapper function to turn synchronous functions into async functions.

    Args:
        func: Synchronous function to wrap.
    """

    @wraps(func)
    async def run(*args, loop=None, executor=None, **kwargs):
        if loop is None:
            loop = asyncio.get_event_loop()
        pfunc = partial(func, *args, **kwargs)
        return await loop.run_in_executor(executor, pfunc)

    return run


class DatabaseVersion(Enum):
    """Enum class for database version.

    All supported database versions for service."""

    MYSQL_8_0 = "MYSQL_8_0"
    POSTGRES_13 = "POSTGRES_13"
    POSTGRES_12 = "POSTGRES_12"
    POSTGRES_11 = "POSTGRES_11"
    POSTGRES_10 = "POSTGRES_10"
    POSTGRES_9_6 = "POSTGRES_9_6"

    def is_mysql(self):
        """Helper method to determine if database is MySQL dialect."""

        return self.value.startswith("MYSQL")

    def is_postgres(self):
        """Helper method to determine if database is PostgreSQL dialect."""

        return self.value.startswith("POSTGRES")


class RoleService(ABC):
    """Interface for managing a database and it's group roles.

    This interface lays out the required methods for subclasses to implement.
    Ex. MysqlRoleService subclass would implement the methods below for MySQL."""

    @abstractmethod
    def __init__(self, db):
        pass

    @abstractmethod
    def fetch_role_grants(self, group_name):
        pass

    @abstractmethod
    def create_group_role(self, role):
        pass

    @abstractmethod
    def grant_group_role(self, role, users):
        pass

    @abstractmethod
    def revoke_group_role(self, role, users):
        pass

# Copyright 2021 Google LLC # # Licensed 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 # #     https://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. # utils.py contains utility functions shared between modules Wrapper function to turn synchronous functions into async functions.      Args:         func: Synchronous function to wrap. Enum class for database version.      All supported database versions for service. Helper method to determine if database is MySQL dialect. Helper method to determine if database is PostgreSQL dialect. Interface for managing a database and it's group roles.      This interface lays out the required methods for subclasses to implement.     Ex. MysqlRoleService subclass would implement the methods below for MySQL.