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###
# ============LICENSE_START=======================================================
# Simulator
# ================================================================================
# Copyright (C) 2021 Nokia. All rights reserved.
# ================================================================================
# 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
#
# 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.
# ============LICENSE_END=========================================================
###
import logging
import websockets
import asyncio
import signal
import sys
class TailfClient(object):
def __init__(self, url: str, verbose: bool = False) -> None:
self._url = url
self._is_running = False
self._connection = None
self.logger = logging.getLogger()
self.logger.setLevel(logging.DEBUG if verbose else logging.INFO)
signal.signal(signal.SIGINT, self._handle_keyboard_interrupt)
def tailf_messages(self):
self._is_running = True
self.logger.debug("Attempting to connect to websocket server on %s", self._url)
asyncio.get_event_loop().run_until_complete(
self._tailf_messages()
)
async def _tailf_messages(self):
try:
async with websockets.connect(self._url) as connection:
self.logger.debug("Connection with %s established", self._url)
self._connection = connection
while self._is_running:
print(await self._connection.recv(), "\n")
except ConnectionRefusedError:
self.logger.error("Cannot establish connection with %s", self._url)
def _handle_keyboard_interrupt(self, sig, frame):
self.logger.warning("CTR-C pressed, interrupting.")
self._is_running = False
sys.exit(0)
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