73 lines
No EOL
2.5 KiB
Python
73 lines
No EOL
2.5 KiB
Python
import time
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from datetime import datetime, timedelta
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from . import base, MasterRole
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from source import packets
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from .SlaveRole import SlaveRole
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from ...managers import Manager
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from ...utils.crypto.type import CipherType
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class UndefinedRole(base.BaseRole):
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"""
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Role used when the peer have no defined state, for example just after starting.
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It looks for the current network peers state and try to integrate itself inside.
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"""
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def __init__(self, manager: "Manager"):
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super().__init__(manager)
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self.old_peers: list[packets.PeerPacket] = []
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self.previous_discovery: datetime = datetime.now()
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def handle(self):
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# discover new peers
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packet = packets.DiscoveryPacket()
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self.manager.communication.broadcast(packet, CipherType.PLAIN)
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# wait for new messages
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time.sleep(1)
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# check if a new peer have been registered
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if self.manager.peers != self.old_peers:
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self.old_peers = self.manager.peers.copy()
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self.previous_discovery = datetime.now()
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# check if no more peers have been found in the previous seconds
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if datetime.now() - self.previous_discovery >= timedelta(seconds=5):
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# SCENARIO 1 - empty network
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# filter ourselves out of the remote peers
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remote_peers = {
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address: peer
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for (address, peer) in self.manager.peers.items()
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if not self.manager.communication.is_address_local(address)
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}
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# if no other peers have been found
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if len(remote_peers) == 0:
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# declare ourselves as the master of the network
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self.manager.role.current = MasterRole(self.manager)
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return
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# SCENARIO 2 - network with a master
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# list all the peers considered as masters
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master_peers = {
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address: peer
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for (address, peer) in remote_peers.items()
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if peer.master
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}
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# if there is a master, become a slave
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if len(master_peers) >= 1:
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master_address, master_peer = master_peers[0]
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# declare ourselves as a slave of the network
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self.manager.role.current = SlaveRole(self.manager, master_address)
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# SCENARIO 3 - network with no master
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# TODO(Faraphel): elect the machine with the lowest ping in the network
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raise NotImplementedError("Not implemented: elect the machine with the lowest ping as a master.") |