forked from townforge/townforge
83 lines
3.2 KiB
Python
Executable File
83 lines
3.2 KiB
Python
Executable File
#!/usr/bin/python3
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# Copyright (c) 2014-2020, The Monero Project
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#
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without modification, are
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# permitted provided that the following conditions are met:
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#
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# 1. Redistributions of source code must retain the above copyright notice, this list of
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# conditions and the following disclaimer.
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#
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# 2. Redistributions in binary form must reproduce the above copyright notice, this list
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# of conditions and the following disclaimer in the documentation and/or other
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# materials provided with the distribution.
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#
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# 3. Neither the name of the copyright holder nor the names of its contributors may be
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# used to endorse or promote products derived from this software without specific
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# prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
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# EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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# MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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# THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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# STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
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# THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#
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# Parts of this file are originally copyright (c) 2012-2013 The Cryptonote developers
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from random import randint
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DIFFICULTY_TARGET = 120
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DIFFICULTY_WINDOW = 720
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DIFFICULTY_LAG = 15
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DIFFICULTY_CUT = 60
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UINT_MAX = (1 << 64) - 1
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def difficulty():
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times = []
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diffs = []
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while True:
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if len(times) <= 1:
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diff = 1
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else:
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begin = max(len(times) - DIFFICULTY_WINDOW - DIFFICULTY_LAG, 0)
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end = min(begin + DIFFICULTY_WINDOW, len(times))
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length = end - begin
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assert length >= 2
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if length <= DIFFICULTY_WINDOW - 2 * DIFFICULTY_CUT:
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cut_begin = 0
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cut_end = length
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else:
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excess = length - (DIFFICULTY_WINDOW - 2 * DIFFICULTY_CUT)
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cut_begin = (excess + 1) // 2
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cut_end = length - excess // 2
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assert cut_begin + 2 <= cut_end
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wnd = times[begin:end]
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wnd.sort()
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dtime = wnd[cut_end - 1] - wnd[cut_begin]
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assert 0 <= dtime <= UINT_MAX
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dtime = max(dtime, 1)
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ddiff = sum(diffs[begin + cut_begin + 1:begin + cut_end])
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assert 0 < ddiff <= UINT_MAX
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assert dtime <= ddiff * DIFFICULTY_TARGET + dtime - 1 <= UINT_MAX
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diff = (ddiff * DIFFICULTY_TARGET + dtime - 1) // dtime
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assert 0 < diff <= UINT_MAX
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times.append((yield diff))
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diffs.append(diff)
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time = 1000
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gen = difficulty()
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diff = next(gen)
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for i in range(1000):
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power = 10 if i < 100 else 10000 if i < 500 else 1000000
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time += randint(-diff // power - 10, 3 * diff // power + 10)
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assert 0 <= time <= UINT_MAX
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print(time, diff)
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diff = gen.send(time)
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