forked from LBRYCommunity/lbry-sdk
10b34d6b33
instead of recursive bytes2unicode use a proper JSONEncoder to conver bytes->unicode for json.dumps() removing excessive isinstance(data, bytes) checks py3: / -> // and list() around .items() that gets modified in loop moved lbrynet.undecorated to where its actually used and hopefully we can delete it eventually removed build/upload_assets.py, travis can do all this now
30 lines
885 B
Python
30 lines
885 B
Python
from binascii import hexlify
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from lbrynet.dht import constants
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class Distance:
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"""Calculate the XOR result between two string variables.
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Frequently we re-use one of the points so as an optimization
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we pre-calculate the value of that point.
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"""
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def __init__(self, key):
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if len(key) != constants.key_bits // 8:
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raise ValueError("invalid key length: %i" % len(key))
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self.key = key
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self.val_key_one = int(hexlify(key), 16)
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def __call__(self, key_two):
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val_key_two = int(hexlify(key_two), 16)
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return self.val_key_one ^ val_key_two
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def is_closer(self, a, b):
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"""Returns true is `a` is closer to `key` than `b` is"""
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return self(a) < self(b)
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def to_contact(self, contact):
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"""A convenience function for calculating the distance to a contact"""
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return self(contact.id)
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