Onionr/onionr/subprocesspow.py

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Python
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2019-03-12 18:23:46 +00:00
#!/usr/bin/env python3
import subprocess, sys, os
import multiprocessing, threading, time, json, math, binascii
from multiprocessing import Pipe, Process
import core, onionrblockapi, config, onionrutils, logger, onionrproofs
class SubprocessPOW:
def __init__(self, data, metadata, core_inst=None, subprocCount=None):
if core_inst is None:
core_inst = core.Core()
if subprocCount is None:
subprocCount = os.cpu_count()
self.subprocCount = subprocCount
self.result = ''
self.shutdown = False
self.core_inst = core_inst
self.data = data
self.metadata = metadata
dataLen = len(data) + len(json.dumps(metadata))
#if forceDifficulty > 0:
# self.difficulty = forceDifficulty
#else:
# Calculate difficulty. Dumb for now, may use good algorithm in the future.
self.difficulty = onionrproofs.getDifficultyForNewBlock(dataLen)
try:
self.data = self.data.encode()
except AttributeError:
pass
logger.info('Computing POW (difficulty: %s)...' % self.difficulty)
self.mainHash = '0' * 64
self.puzzle = self.mainHash[0:min(self.difficulty, len(self.mainHash))]
self.shutdown = False
self.payload = None
def start(self):
startTime = self.core_inst._utils.getEpoch()
for x in range(self.subprocCount):
threading.Thread(target=self._spawn_proc).start()
while True:
if self.payload is None:
time.sleep(0.1)
else:
self.shutdown = True
return self.payload
def _spawn_proc(self):
parent_conn, child_conn = Pipe()
p = Process(target=self.do_pow, args=(child_conn,))
p.start()
p.join()
payload = None
try:
while True:
data = parent_conn.recv()
if len(data) >= 1:
payload = data
break
except KeyboardInterrupt:
pass
finally:
parent_conn.send('shutdown')
self.payload = payload
def do_pow(self, pipe):
nonce = int(binascii.hexlify(os.urandom(2)), 16)
nonceStart = nonce
data = self.data
metadata = self.metadata
puzzle = self.puzzle
difficulty = self.difficulty
mcore = core.Core()
while True:
metadata['powRandomToken'] = nonce
payload = json.dumps(metadata).encode() + b'\n' + data
token = mcore._crypto.sha3Hash(payload)
try:
# on some versions, token is bytes
token = token.decode()
except AttributeError:
pass
if pipe.poll() and pipe.recv() == 'shutdown':
break
if puzzle == token[0:difficulty]:
pipe.send(payload)
break
nonce += 1