323 lines
No EOL
12 KiB
Python
323 lines
No EOL
12 KiB
Python
from collections import defaultdict
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import logging
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import os
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import unqlite
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import time
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from Crypto.Hash import SHA512
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from Crypto.PublicKey import RSA
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from lbrynet.core.client.ClientRequest import ClientRequest
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from lbrynet.core.Error import RequestCanceledError
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from lbrynet.interfaces import IRequestCreator, IQueryHandlerFactory, IQueryHandler, IWallet
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from lbrynet.pointtraderclient import pointtraderclient
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from twisted.internet import defer, threads
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from zope.interface import implements
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from twisted.python.failure import Failure
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from lbrynet.core.Wallet import ReservedPoints
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log = logging.getLogger(__name__)
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class PTCWallet(object):
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"""This class sends payments to peers and also ensures that expected payments are received.
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This class is only intended to be used for testing."""
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implements(IWallet)
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def __init__(self, db_dir):
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self.db_dir = db_dir
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self.db = None
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self.private_key = None
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self.encoded_public_key = None
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self.peer_pub_keys = {}
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self.queued_payments = defaultdict(int)
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self.expected_payments = defaultdict(list)
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self.received_payments = defaultdict(list)
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self.next_manage_call = None
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self.payment_check_window = 3 * 60 # 3 minutes
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self.new_payments_expected_time = time.time() - self.payment_check_window
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self.known_transactions = []
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self.total_reserved_points = 0.0
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self.wallet_balance = 0.0
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def manage(self):
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"""Send payments, ensure expected payments are received"""
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from twisted.internet import reactor
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if time.time() < self.new_payments_expected_time + self.payment_check_window:
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d1 = self._get_new_payments()
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else:
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d1 = defer.succeed(None)
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d1.addCallback(lambda _: self._check_good_standing())
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d2 = self._send_queued_points()
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self.next_manage_call = reactor.callLater(60, self.manage)
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dl = defer.DeferredList([d1, d2])
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dl.addCallback(lambda _: self.get_balance())
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def set_balance(balance):
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self.wallet_balance = balance
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dl.addCallback(set_balance)
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return dl
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def stop(self):
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if self.next_manage_call is not None:
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self.next_manage_call.cancel()
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self.next_manage_call = None
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d = self.manage()
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self.next_manage_call.cancel()
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self.next_manage_call = None
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self.db = None
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return d
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def start(self):
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def save_key(success, private_key):
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if success is True:
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self._save_private_key(private_key.exportKey())
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return True
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return False
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def register_private_key(private_key):
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self.private_key = private_key
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self.encoded_public_key = self.private_key.publickey().exportKey()
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d_r = pointtraderclient.register_new_account(private_key)
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d_r.addCallback(save_key, private_key)
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return d_r
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def ensure_private_key_exists(encoded_private_key):
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if encoded_private_key is not None:
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self.private_key = RSA.importKey(encoded_private_key)
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self.encoded_public_key = self.private_key.publickey().exportKey()
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return True
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else:
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create_d = threads.deferToThread(RSA.generate, 4096)
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create_d.addCallback(register_private_key)
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return create_d
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def start_manage():
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self.manage()
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return True
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d = self._open_db()
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d.addCallback(lambda _: self._get_wallet_private_key())
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d.addCallback(ensure_private_key_exists)
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d.addCallback(lambda _: start_manage())
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return d
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def get_info_exchanger(self):
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return PointTraderKeyExchanger(self)
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def get_wallet_info_query_handler_factory(self):
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return PointTraderKeyQueryHandlerFactory(self)
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def reserve_points(self, peer, amount):
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"""
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Ensure a certain amount of points are available to be sent as payment, before the service is rendered
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@param peer: The peer to which the payment will ultimately be sent
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@param amount: The amount of points to reserve
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@return: A ReservedPoints object which is given to send_points once the service has been rendered
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"""
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if self.wallet_balance >= self.total_reserved_points + amount:
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self.total_reserved_points += amount
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return ReservedPoints(peer, amount)
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return None
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def cancel_point_reservation(self, reserved_points):
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"""
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Return all of the points that were reserved previously for some ReservedPoints object
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@param reserved_points: ReservedPoints previously returned by reserve_points
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@return: None
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"""
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self.total_reserved_points -= reserved_points.amount
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def send_points(self, reserved_points, amount):
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"""
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Schedule a payment to be sent to a peer
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@param reserved_points: ReservedPoints object previously returned by reserve_points
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@param amount: amount of points to actually send, must be less than or equal to the
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amount reserved in reserved_points
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@return: Deferred which fires when the payment has been scheduled
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"""
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self.queued_payments[reserved_points.identifier] += amount
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# make any unused points available
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self.total_reserved_points -= reserved_points.amount - amount
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reserved_points.identifier.update_stats('points_sent', amount)
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d = defer.succeed(True)
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return d
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def _send_queued_points(self):
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ds = []
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for peer, points in self.queued_payments.items():
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if peer in self.peer_pub_keys:
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d = pointtraderclient.send_points(self.private_key, self.peer_pub_keys[peer], points)
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self.wallet_balance -= points
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self.total_reserved_points -= points
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ds.append(d)
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del self.queued_payments[peer]
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else:
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log.warning("Don't have a payment address for peer %s. Can't send %s points.",
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str(peer), str(points))
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return defer.DeferredList(ds)
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def get_balance(self):
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"""Return the balance of this wallet"""
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d = pointtraderclient.get_balance(self.private_key)
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return d
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def add_expected_payment(self, peer, amount):
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"""Increase the number of points expected to be paid by a peer"""
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self.expected_payments[peer].append((amount, time.time()))
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self.new_payments_expected_time = time.time()
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peer.update_stats('expected_points', amount)
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def set_public_key_for_peer(self, peer, pub_key):
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self.peer_pub_keys[peer] = pub_key
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def _get_new_payments(self):
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def add_new_transactions(transactions):
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for transaction in transactions:
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if transaction[1] == self.encoded_public_key:
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t_hash = SHA512.new()
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t_hash.update(transaction[0])
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t_hash.update(transaction[1])
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t_hash.update(str(transaction[2]))
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t_hash.update(transaction[3])
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if t_hash.hexdigest() not in self.known_transactions:
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self.known_transactions.append(t_hash.hexdigest())
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self._add_received_payment(transaction[0], transaction[2])
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d = pointtraderclient.get_recent_transactions(self.private_key)
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d.addCallback(add_new_transactions)
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return d
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def _add_received_payment(self, encoded_other_public_key, amount):
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self.received_payments[encoded_other_public_key].append((amount, time.time()))
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def _check_good_standing(self):
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for peer, expected_payments in self.expected_payments.iteritems():
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expected_cutoff = time.time() - 90
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min_expected_balance = sum([a[0] for a in expected_payments if a[1] < expected_cutoff])
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received_balance = 0
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if self.peer_pub_keys[peer] in self.received_payments:
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received_balance = sum([a[0] for a in self.received_payments[self.peer_pub_keys[peer]]])
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if min_expected_balance > received_balance:
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log.warning("Account in bad standing: %s (pub_key: %s), expected amount = %s, received_amount = %s",
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str(peer), self.peer_pub_keys[peer], str(min_expected_balance), str(received_balance))
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def _open_db(self):
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def open_db():
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self.db = unqlite.UnQLite(os.path.join(self.db_dir, "ptcwallet.db"))
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return threads.deferToThread(open_db)
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def _save_private_key(self, private_key):
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def save_key():
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self.db['private_key'] = private_key
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return threads.deferToThread(save_key)
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def _get_wallet_private_key(self):
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def get_key():
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if 'private_key' in self.db:
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return self.db['private_key']
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return None
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return threads.deferToThread(get_key)
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class PointTraderKeyExchanger(object):
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implements([IRequestCreator])
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def __init__(self, wallet):
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self.wallet = wallet
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self._protocols = []
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######### IRequestCreator #########
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def send_next_request(self, peer, protocol):
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if not protocol in self._protocols:
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r = ClientRequest({'public_key': self.wallet.encoded_public_key},
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'public_key')
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d = protocol.add_request(r)
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d.addCallback(self._handle_exchange_response, peer, r, protocol)
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d.addErrback(self._request_failed, peer)
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self._protocols.append(protocol)
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return defer.succeed(True)
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else:
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return defer.succeed(False)
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######### internal calls #########
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def _handle_exchange_response(self, response_dict, peer, request, protocol):
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assert request.response_identifier in response_dict, \
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"Expected %s in dict but did not get it" % request.response_identifier
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assert protocol in self._protocols, "Responding protocol is not in our list of protocols"
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peer_pub_key = response_dict[request.response_identifier]
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self.wallet.set_public_key_for_peer(peer, peer_pub_key)
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return True
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def _request_failed(self, err, peer):
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if not err.check(RequestCanceledError):
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log.warning("A peer failed to send a valid public key response. Error: %s, peer: %s",
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err.getErrorMessage(), str(peer))
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return err
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class PointTraderKeyQueryHandlerFactory(object):
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implements(IQueryHandlerFactory)
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def __init__(self, wallet):
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self.wallet = wallet
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######### IQueryHandlerFactory #########
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def build_query_handler(self):
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q_h = PointTraderKeyQueryHandler(self.wallet)
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return q_h
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def get_primary_query_identifier(self):
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return 'public_key'
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def get_description(self):
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return "Point Trader Address - an address for receiving payments on the point trader testing network"
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class PointTraderKeyQueryHandler(object):
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implements(IQueryHandler)
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def __init__(self, wallet):
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self.wallet = wallet
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self.query_identifiers = ['public_key']
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self.public_key = None
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self.peer = None
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######### IQueryHandler #########
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def register_with_request_handler(self, request_handler, peer):
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self.peer = peer
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request_handler.register_query_handler(self, self.query_identifiers)
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def handle_queries(self, queries):
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if self.query_identifiers[0] in queries:
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new_encoded_pub_key = queries[self.query_identifiers[0]]
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try:
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RSA.importKey(new_encoded_pub_key)
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except (ValueError, TypeError, IndexError):
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log.warning("Client sent an invalid public key.")
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return defer.fail(Failure(ValueError("Client sent an invalid public key")))
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self.public_key = new_encoded_pub_key
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self.wallet.set_public_key_for_peer(self.peer, self.public_key)
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log.debug("Received the client's public key: %s", str(self.public_key))
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fields = {'public_key': self.wallet.encoded_public_key}
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return defer.succeed(fields)
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if self.public_key is None:
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log.warning("Expected a public key, but did not receive one")
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return defer.fail(Failure(ValueError("Expected but did not receive a public key")))
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else:
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return defer.succeed({}) |