Onionr/src/onionrproofs/__init__.py

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'''
Onionr - Private P2P Communication
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Proof of work module
'''
'''
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
'''
import multiprocessing, time, math, threading, binascii, sys, json
import nacl.encoding, nacl.hash, nacl.utils
import config, logger
from onionrblocks import onionrblockapi, storagecounter
from onionrutils import bytesconverter
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from onionrcrypto import hashers
from .blocknoncestart import BLOCK_NONCE_START_INT
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config.reload()
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def getDifficultyModifier():
'''returns the difficulty modifier for block storage based
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on a variety of factors, currently only disk use.
'''
percentUse = storagecounter.StorageCounter().get_percent()
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difficultyIncrease = math.floor(4 * percentUse) # difficulty increase is a step function
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return difficultyIncrease
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def getDifficultyForNewBlock(data):
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'''
Get difficulty for block. Accepts size in integer, Block instance, or str/bytes full block contents
'''
if isinstance(data, onionrblockapi.Block):
dataSizeInBytes = len(bytesconverter.str_to_bytes(data.getRaw()))
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else:
dataSizeInBytes = len(bytesconverter.str_to_bytes(data))
minDifficulty = config.get('general.minimum_send_pow', 4)
totalDifficulty = max(minDifficulty, math.floor(dataSizeInBytes / 1000000.0)) + getDifficultyModifier()
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return totalDifficulty
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return retData
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def getHashDifficulty(h: str):
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'''
Return the amount of leading zeroes in a hex hash string (hexHash)
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'''
return len(h) - len(h.lstrip('0'))
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def hashMeetsDifficulty(hexHash):
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'''
Return bool for a hash string to see if it meets pow difficulty defined in config
'''
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hashDifficulty = getHashDifficulty(hexHash)
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try:
expected = int(config.get('general.minimum_block_pow'))
except TypeError:
raise ValueError('Missing general.minimum_block_pow config')
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return hashDifficulty >= expected
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class POW:
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def __init__(self, metadata, data, threadCount = 1, minDifficulty=0):
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self.foundHash = False
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self.difficulty = 0
self.data = data
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self.metadata = metadata
self.threadCount = threadCount
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self.hashing = False
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json_metadata = json.dumps(metadata).encode()
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try:
self.data = self.data.encode()
except AttributeError:
pass
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if minDifficulty > 0:
self.difficulty = minDifficulty
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else:
# Calculate difficulty. Dumb for now, may use good algorithm in the future.
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self.difficulty = getDifficultyForNewBlock(bytes(json_metadata + b'\n' + self.data))
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logger.info('Computing POW (difficulty: %s)...' % (self.difficulty,))
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self.mainHash = '0' * 64
self.puzzle = self.mainHash[0:min(self.difficulty, len(self.mainHash))]
for i in range(max(1, threadCount)):
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t = threading.Thread(name = 'thread%s' % i, target = self.pow, args = (True,))
t.start()
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def pow(self, reporting = False):
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startTime = math.floor(time.time())
self.hashing = True
self.reporting = reporting
iFound = False # if current thread is the one that found the answer
nonce = BLOCK_NONCE_START_INT
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while self.hashing:
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self.metadata['pow'] = nonce
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payload = json.dumps(self.metadata).encode() + b'\n' + self.data
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token = hashers.sha3_hash(payload)
try:
# on some versions, token is bytes
token = token.decode()
except AttributeError:
pass
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if self.puzzle == token[0:self.difficulty]:
self.hashing = False
iFound = True
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self.result = payload
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break
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nonce += 1
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if iFound:
endTime = math.floor(time.time())
if self.reporting:
logger.debug('Found token after %s seconds: %s' % (endTime - startTime, token), timestamp=True)
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def shutdown(self):
self.hashing = False
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self.puzzle = ''
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def changeDifficulty(self, newDiff):
self.difficulty = newDiff
def getResult(self):
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'''
Returns the result then sets to false, useful to automatically clear the result
'''
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try:
retVal = self.result
except AttributeError:
retVal = False
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self.result = False
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return retVal
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def waitForResult(self):
'''
Returns the result only when it has been found, False if not running and not found
'''
result = False
try:
while True:
result = self.getResult()
if not self.hashing:
break
else:
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time.sleep(1)
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except KeyboardInterrupt:
self.shutdown()
logger.warn('Got keyboard interrupt while waiting for POW result, stopping')
return result