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# Copyright 2019 PrivateStorage.io, LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""
A module for logic controlling the manner in which ZKAPs are spent.
"""
import attr
from .eliot import (
GET_PASSES,
)
@attr.s
class SpendingController(object):
"""
A ``SpendingController`` gives out ZKAPs and arranges for re-spend
attempts when necessary.
"""
extract_unblinded_tokens = attr.ib()
tokens_to_passes = attr.ib()
def get(self, message, num_passes):
unblinded_tokens = self.extract_unblinded_tokens(num_passes)
passes = self.tokens_to_passes(message, unblinded_tokens)
GET_PASSES.log(
message=message,
count=num_passes,
)
return passes