120 lines
4.7 KiB
Python
Executable File
120 lines
4.7 KiB
Python
Executable File
#!/usr/bin/env python3
|
|
'''
|
|
Onionr - Private P2P Communication
|
|
|
|
Multiprocess proof of work
|
|
'''
|
|
'''
|
|
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 subprocess, os
|
|
import multiprocessing, threading, time, json
|
|
from multiprocessing import Pipe, Process
|
|
import core, onionrblockapi, config, onionrutils, logger, onionrproofs
|
|
from onionrutils import bytesconverter
|
|
|
|
class SubprocessPOW:
|
|
def __init__(self, data, metadata, core_inst=None, subproc_count=None):
|
|
'''
|
|
Onionr proof of work using multiple processes
|
|
Accepts block data, block metadata
|
|
and optionally an onionr core library instance.
|
|
if subproc_count is not set, os.cpu_count() is used to determine the number of processes
|
|
|
|
Do to Python GIL multiprocessing or use of external libraries is necessary to accelerate CPU bound tasks
|
|
'''
|
|
# Option to accept existing core instance to save memory
|
|
if core_inst is None:
|
|
core_inst = core.Core()
|
|
# No known benefit to using more processes than there are cores.
|
|
# Note: os.cpu_count perhaps not always accurate
|
|
if subproc_count is None:
|
|
subproc_count = os.cpu_count()
|
|
self.subproc_count = subproc_count
|
|
self.result = ''
|
|
self.shutdown = False
|
|
self.core_inst = core_inst
|
|
self.data = data
|
|
self.metadata = metadata
|
|
|
|
# dump dict to measure bytes of json metadata. Cannot reuse later because the pow token must be added
|
|
json_metadata = json.dumps(metadata).encode()
|
|
|
|
self.data = bytesconverter.str_to_bytes(data)
|
|
# Calculate difficulty. Dumb for now, may use good algorithm in the future.
|
|
self.difficulty = onionrproofs.getDifficultyForNewBlock(bytes(json_metadata + b'\n' + self.data), coreInst=self.core_inst)
|
|
|
|
logger.debug('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):
|
|
# Create a new thread for each subprocess
|
|
for x in range(self.subproc_count):
|
|
threading.Thread(target=self._spawn_proc).start()
|
|
# Monitor the processes for a payload, shut them down when its found
|
|
while True:
|
|
if self.payload is None:
|
|
time.sleep(0.1)
|
|
else:
|
|
self.shutdown = True
|
|
return self.payload
|
|
|
|
def _spawn_proc(self):
|
|
# Create a child proof of work process, wait for data and send shutdown signal when its found
|
|
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 = -10000000 # Start nonce at negative 10 million so that the chosen nonce is likely to be small in length
|
|
nonceStart = nonce
|
|
data = self.data
|
|
metadata = self.metadata
|
|
puzzle = self.puzzle
|
|
difficulty = self.difficulty
|
|
mcore = core.Core() # I think we make a new core here because of multiprocess bugs
|
|
while True:
|
|
# Break if shutdown received
|
|
if pipe.poll() and pipe.recv() == 'shutdown':
|
|
break
|
|
# Load nonce into block metadata
|
|
metadata['pow'] = nonce
|
|
# Serialize metadata, combine with block data
|
|
payload = json.dumps(metadata).encode() + b'\n' + data
|
|
# Check sha3_256 hash of block, compare to puzzle. Send payload if puzzle finished
|
|
token = mcore._crypto.sha3Hash(payload)
|
|
token = bytesconverter.bytes_to_str(token) # ensure token is string
|
|
if puzzle == token[0:difficulty]:
|
|
pipe.send(payload)
|
|
break
|
|
nonce += 1
|