###############################################################################
#
# 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.
#
###############################################################################
try:
from autobahn import xbr
HAS_XBR = True
except:
HAS_XBR = False
if HAS_XBR:
import uuid
import asyncio
import txaio
from autobahn.util import hl
from autobahn.xbr._interfaces import IProvider, ISeller, IConsumer, IBuyer
[docs] def run_in_executor(*args, **kwargs):
return asyncio.get_running_loop().run_in_executor(None, *args, **kwargs)
class SimpleBlockchain(xbr.SimpleBlockchain):
backgroundCaller = run_in_executor
class KeySeries(xbr.KeySeries):
log = txaio.make_logger()
def __init__(self, api_id, price, interval, on_rotate=None):
super().__init__(api_id, price, interval, on_rotate)
self.running = False
async def start(self):
"""
Start offering and selling data encryption keys in the background.
"""
assert not self.running
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
async def rotate_with_interval():
while self.running:
await self._rotate()
await asyncio.sleep(self._interval)
asyncio.create_task(rotate_with_interval())
def stop(self):
"""
Stop offering/selling data encryption keys.
"""
if not self.running:
raise RuntimeError('cannot stop {} - not currently running'.format(self.__class__.__name__))
self.running = False
class SimpleSeller(xbr.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.
"""
xbr.SimpleSeller.KeySeries = KeySeries
class SimpleBuyer(xbr.SimpleBuyer):
pass
ISeller.register(SimpleSeller)
IProvider.register(SimpleSeller)
IBuyer.register(SimpleBuyer)
IConsumer.register(SimpleBuyer)