aman-sys/aman/com/Euroscope.py

#!/usr/bin/env python

import glob
import os
import sys

import zmq
from zmq.asyncio import Context
import zmq.auth
from zmq.auth.asyncio import AsyncioAuthenticator

from aman.config import Server

# @brief Receives and sends messages to EuroScope plugins
class Euroscope:
    # @brief Initializes the ZMQ socket
    # @param[in] config The server configuration
    def __init__(self, config : Server.Server):
        self.context = Context.instance()

        # initialize the authentication module
        authLocation = (
            str(config.ClientKeyPath)
        )
        self.auth = AsyncioAuthenticator(context = self.context)
        self.auth.configure_curve(domain='*', location = authLocation)
        self.auth.allow('127.0.0.1')
        self.auth.start()

        # read the certificates
        keyPairPath = glob.glob(os.path.join(config.ServerKeyPath, '*.key_secret'))
        if 1 != len(keyPairPath):
            sys.stderr.write('No public-private keypair found for the server certificate')
            sys.exit(-1)
        keyPair = zmq.auth.load_certificate(keyPairPath[0])

        # initialize the receiver
        self.receiverSocket = self.context.socket(zmq.ROUTER)
        self.receiverSocket.setsockopt(zmq.CURVE_PUBLICKEY, keyPair[0])
        self.receiverSocket.setsockopt(zmq.CURVE_SECRETKEY, keyPair[1])
        self.receiverSocket.setsockopt(zmq.CURVE_SERVER, True)
        self.receiverSocket.bind('tcp://' + config.Address + ':' + str(config.PortReceiver))

        # initialize the notification
        self.notificationSocket = self.context.socket(zmq.DEALER)
        self.notificationSocket.setsockopt(zmq.CURVE_PUBLICKEY, keyPair[0])
        self.notificationSocket.setsockopt(zmq.CURVE_SECRETKEY, keyPair[1])
        self.notificationSocket.setsockopt(zmq.CURVE_SERVER, True)
        self.notificationSocket.bind('tcp://' + config.Address + ':' + str(config.PortNotification))

    def __exit__(self, *_exc):
        self.auth.stop()