###############################################################################
#
# The MIT License (MIT)
#
# Copyright (c) Crossbar.io Technologies GmbH
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
#
###############################################################################
import sys
try:
from autobahn import xbr # noqa
HAS_XBR = True
except ImportError as e:
sys.stderr.write('WARNING: could not import autobahn.xbr - {}\n'.format(e))
HAS_XBR = False
if HAS_XBR:
import txaio
txaio.use_twisted()
from twisted.internet.threads import deferToThread
from twisted.internet.task import LoopingCall
from twisted.internet.defer import ensureDeferred
import uuid
from autobahn.util import hl
from autobahn.xbr._interfaces import IProvider, ISeller, IConsumer, IBuyer, IDelegate
from autobahn.xbr import _seller, _buyer, _blockchain
[docs] class SimpleBlockchain(_blockchain.SimpleBlockchain):
log = txaio.make_logger()
backgroundCaller = deferToThread
class KeySeries(_seller.KeySeries):
log = txaio.make_logger()
def __init__(self, api_id, price, interval=None, count=None, on_rotate=None):
super().__init__(api_id, price, interval, count, on_rotate)
self.running = False
self._run_loop = None
self._started = None
async def start(self):
"""
Start offering and selling data encryption keys in the background.
"""
assert self._run_loop is None
self.log.info('Starting key rotation every {interval} seconds for api_id="{api_id}" ..',
interval=hl(self._interval), api_id=hl(uuid.UUID(bytes=self._api_id)))
self.running = True
self._run_loop = LoopingCall(lambda: ensureDeferred(self._rotate()))
self._started = self._run_loop.start(self._interval)
return self._started
def stop(self):
"""
Stop offering/selling data encryption keys.
"""
if not self._run_loop:
raise RuntimeError('cannot stop {} - not currently running'.format(self.__class__.__name__))
self._run_loop.stop()
self._run_loop = None
return self._started
class SimpleSeller(_seller.SimpleSeller):
"""
Simple XBR seller component. This component can be used by a XBR seller delegate to
handle the automated selling of data encryption keys to the XBR market maker.
"""
log = txaio.make_logger()
KeySeries = KeySeries
class SimpleBuyer(_buyer.SimpleBuyer):
log = txaio.make_logger()
ISeller.register(SimpleSeller)
IProvider.register(SimpleSeller)
IDelegate.register(SimpleSeller)
IBuyer.register(SimpleBuyer)
IConsumer.register(SimpleBuyer)
IDelegate.register(SimpleBuyer)