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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 json
import logging
from threading import Thread, current_thread
from .internal.constants import agent_sock
from .internal.exceptions import SSAError
from .internal.utils import create_socket
from .modules.processor import RequestProcessor


class SimpleAgent:
    """
    SSA Simple Agent class
    """

    def __init__(self):
        self.logger = logging.getLogger('agent')
        self.request_processor = RequestProcessor()
        # start serving incoming connections
        self.listen()

    def listen(self) -> None:
        """
        Start listening socket
        """
        _socket = create_socket(agent_sock)
        while True:
            connection, address = _socket.accept()
            t = Thread(target=self.handle, args=(connection,))
            t.start()
            self.logger.debug('[%s] Started', t.name)

    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)
        return json.loads(data.strip(), strict=False)
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