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# -- coding: utf-8 -- # Copyright © Cloud Linux GmbH & Cloud Linux Software, Inc 2010-2021 All Rights Reserved # # Licensed under CLOUD LINUX LICENSE AGREEMENT # http://cloudlinux.com/docs/LICENSE.TXT """ This module contains contains classes implementing SSA Agent behaviour """ import atexit import json import logging from concurrent.futures import ThreadPoolExecutor from threading import current_thread from .internal.constants import agent_sock from .internal.exceptions import SSAError from .internal.utils import create_socket from .modules.processor import RequestProcessor # Maximum number of concurrent worker threads for handling requests. # Limits memory usage on high-traffic servers. MAX_WORKERS = 50 class SimpleAgent: """ SSA Simple Agent class """ def __init__(self): self.logger = logging.getLogger('agent') self.request_processor = RequestProcessor() self.executor = ThreadPoolExecutor(max_workers=MAX_WORKERS) atexit.register(self._shutdown) # start serving incoming connections self.listen() def _shutdown(self): """Gracefully shutdown the thread pool executor.""" self.executor.shutdown(wait=False) def listen(self) -> None: """ Start listening socket """ _socket = create_socket(agent_sock) while True: connection, address = _socket.accept() self.executor.submit(self.handle, connection) self.logger.debug('[ThreadPool] Submitted task') def handle(self, connection: 'socket object') -> None: """ Handle incoming connection :param connection: socket object usable to send and receive data on the connection """ fileobj = connection.makefile(errors='ignore') try: input_data = self.read_input(fileobj) self.request_processor.handle(input_data) except SSAError as e: self.logger.error('Handled exception in [%s]: %s', current_thread().name, str(e)) pass connection.close() def read_input(self, fileio: 'file object') -> dict: """ Read input data and return decoded json :param fileio: a file-like object providing read method """ data = fileio.read() self.logger.info('[%s] I received %i bytes: %s', current_thread().name, len(data.encode()), data) if data: return json.loads(data.strip(), strict=False) else: return {}

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