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"""Manage the forwarder process.""" import logging import threading try: import queue except ImportError: import queue as Queue class Forwarder(object): """Forwards digest to remote pyzor servers""" def __init__(self, forwarding_client, remote_servers, max_queue_size=10000): """ forward_client: a pyzor.client.Client instance to use as forwarding client remote_servers: a list of (hostname,port) tuples where digests should be forwarded to max_queue_size: max amount of queued digests """ self.log = logging.getLogger("pyzord") self.forwarding_client = forwarding_client self.forward_queue = queue.Queue(max_queue_size) self.remote_servers = remote_servers def _forward_loop(self): """read forwarding requests from the queue""" while True: try: digest, whitelist = self.forward_queue.get(block=True, timeout=2) except queue.Empty: # If the forwarding client has been deleted we should # end the thread if self.forwarding_client is None: return else: continue for server in self.remote_servers: try: if whitelist: self.forwarding_client.whitelist(digest, server) else: self.forwarding_client.report(digest, server) except Exception as ex: self.log.warn('Forwarding digest %s to %s failed: %s', digest, server, ex) def queue_forward_request(self, digest, whitelist=False): """If forwarding is enabled, insert a digest into the forwarding queue if whitelist is True, the digest will be forwarded as whitelist request if the queue is full, the digest is dropped """ if self.forwarding_client is None: # forwarding has been disabled return try: self.forward_queue.put_nowait((digest, whitelist),) except queue.Full: pass def start_forwarding(self): """start the forwarding thread""" threading.Thread(target=self._forward_loop).start() def stop_forwarding(self): """disable forwarding and tell the forwarding thread to end itself""" self.forwarding_client = None