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base.py
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base.py
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# Copyright (c) 2022-2024 Contributors to the Eclipse Foundation
#
# This program and the accompanying materials are made available under the
# terms of the Apache License, Version 2.0 which is available 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.
#
# SPDX-License-Identifier: Apache-2.0
from abc import ABC, abstractmethod
from enum import Enum
from typing import Optional
class MiddlewareType(str, Enum):
"""Enumerator for the supported Velocitas Middlewares."""
NATIVE = "native"
class ServiceLocator(ABC):
"""Service Discovery Locator abstract base class."""
@abstractmethod
def get_service_location(self, service_name: str) -> str:
raise NotImplementedError
@abstractmethod
def get_metadata(self, service_name: Optional[str] = None):
raise NotImplementedError
class PubSubClient(ABC):
"""PubSub client descriptor abstract base class."""
@abstractmethod
async def init(self):
raise NotImplementedError
@abstractmethod
async def run(self):
raise NotImplementedError
@abstractmethod
async def subscribe_topic(self, topic: str, coro):
raise NotImplementedError
@abstractmethod
async def publish_event(self, topic: str, data: str):
raise NotImplementedError
class Middleware(ABC):
"""Middleware abstract base class."""
def __init__(self) -> None:
self.type = MiddlewareType.NATIVE
self.service_locator: ServiceLocator
self.pubsub_client: PubSubClient
@abstractmethod
async def start(self):
raise NotImplementedError
@abstractmethod
async def wait_until_ready(self):
raise NotImplementedError
@abstractmethod
async def stop(self):
raise NotImplementedError