Reference client for Bitmessage: a P2P encrypted decentralised communication protocol:
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# pylint: disable=too-many-branches,too-many-statements,protected-access
"""
Proof of work calculation
"""
import ctypes
import hashlib
import os
import sys
import time
from struct import pack, unpack
from subprocess import call
import openclpow
import paths
import queues
import state
import tr
from bmconfigparser import BMConfigParser
from debug import logger
bitmsglib = 'bitmsghash.so'
bmpow = None
def _set_idle():
if 'linux' in sys.platform:
os.nice(20)
else:
try:
# pylint: disable=no-member,import-error
sys.getwindowsversion()
import win32api
import win32process
import win32con
pid = win32api.GetCurrentProcessId()
handle = win32api.OpenProcess(win32con.PROCESS_ALL_ACCESS, True, pid)
win32process.SetPriorityClass(handle, win32process.IDLE_PRIORITY_CLASS)
except:
# Windows 64-bit
pass
def _pool_worker(nonce, initialHash, target, pool_size):
_set_idle()
trialValue = float('inf')
while trialValue > target:
nonce += pool_size
trialValue, = unpack('>Q', hashlib.sha512(hashlib.sha512(
pack('>Q', nonce) + initialHash).digest()).digest()[0:8])
return [trialValue, nonce]
def _doSafePoW(target, initialHash):
logger.debug("Safe PoW start")
nonce = 0
trialValue = float('inf')
while trialValue > target and state.shutdown == 0:
nonce += 1
trialValue, = unpack('>Q', hashlib.sha512(hashlib.sha512(
pack('>Q', nonce) + initialHash).digest()).digest()[0:8])
if state.shutdown != 0:
raise StopIteration("Interrupted") # pylint: misplaced-bare-raise
logger.debug("Safe PoW done")
return [trialValue, nonce]
def _doFastPoW(target, initialHash):
logger.debug("Fast PoW start")
from multiprocessing import Pool, cpu_count
try:
pool_size = cpu_count()
except:
pool_size = 4
try:
maxCores = BMConfigParser().getint('bitmessagesettings', 'maxcores')
except:
maxCores = 99999
if pool_size > maxCores:
pool_size = maxCores
pool = Pool(processes=pool_size)
result = []
for i in range(pool_size):
result.append(pool.apply_async(_pool_worker, args=(i, initialHash, target, pool_size)))
while True:
if state.shutdown > 0:
try:
pool.terminate()
pool.join()
except:
pass
raise StopIteration("Interrupted")
for i in range(pool_size):
if result[i].ready():
try:
result[i].successful()
except AssertionError:
pool.terminate()
pool.join()
raise StopIteration("Interrupted")
result = result[i].get()
pool.terminate()
pool.join()
logger.debug("Fast PoW done")
return result[0], result[1]
time.sleep(0.2)
def _doCPoW(target, initialHash):
h = initialHash
m = target
out_h = ctypes.pointer(ctypes.create_string_buffer(h, 64))
out_m = ctypes.c_ulonglong(m)
logger.debug("C PoW start")
nonce = bmpow(out_h, out_m)
trialValue, = unpack('>Q', hashlib.sha512(hashlib.sha512(pack('>Q', nonce) + initialHash).digest()).digest()[0:8])
if state.shutdown != 0:
raise StopIteration("Interrupted")
logger.debug("C PoW done")
return [trialValue, nonce]
def _doGPUPoW(target, initialHash):
logger.debug("GPU PoW start")
nonce = openclpow.do_opencl_pow(initialHash.encode("hex"), target)
trialValue, = unpack('>Q', hashlib.sha512(hashlib.sha512(pack('>Q', nonce) + initialHash).digest()).digest()[0:8])
if trialValue > target:
deviceNames = ", ".join(gpu.name for gpu in openclpow.enabledGpus)
queues.UISignalQueue.put((
'updateStatusBar', (
tr._translate(
"MainWindow",
'Your GPU(s) did not calculate correctly, disabling OpenCL. Please report to the developers.'
),
1)))
logger.error(
"Your GPUs (%s) did not calculate correctly, disabling OpenCL. Please report to the developers.",
deviceNames)
openclpow.enabledGpus = []
raise Exception("GPU did not calculate correctly.")
if state.shutdown != 0:
raise StopIteration("Interrupted")
logger.debug("GPU PoW done")
return [trialValue, nonce]
def estimate(difficulty, format=False): # pylint: disable=redefined-builtin
"""
.. todo: fix unused variable
"""
ret = difficulty / 10
if ret < 1:
ret = 1
if format:
# pylint: disable=unused-variable
out = str(int(ret)) + " seconds"
if ret > 60:
ret /= 60
out = str(int(ret)) + " minutes"
if ret > 60:
ret /= 60
out = str(int(ret)) + " hours"
if ret > 24:
ret /= 24
out = str(int(ret)) + " days"
if ret > 7:
out = str(int(ret)) + " weeks"
if ret > 31:
out = str(int(ret)) + " months"
if ret > 366:
ret /= 366
out = str(int(ret)) + " years"
ret = None # Ensure legacy behaviour
return ret
def getPowType():
"""Get the proof of work implementation"""
if openclpow.openclEnabled():
return "OpenCL"
if bmpow:
return "C"
return "python"
def notifyBuild(tried=False):
"""Notify the user of the success or otherwise of building the PoW C module"""
if bmpow:
queues.UISignalQueue.put(('updateStatusBar', (tr._translate(
"proofofwork", "C PoW module built successfully."), 1)))
elif tried:
queues.UISignalQueue.put(
(
'updateStatusBar', (
tr._translate(
"proofofwork",
"Failed to build C PoW module. Please build it manually."
),
1
)
)
)
else:
queues.UISignalQueue.put(('updateStatusBar', (tr._translate(
"proofofwork", "C PoW module unavailable. Please build it."), 1)))
def buildCPoW():
"""Attempt to build the PoW C module"""
if bmpow is not None:
return
if paths.frozen is not None:
notifyBuild(False)
return
if sys.platform in ["win32", "win64"]:
notifyBuild(False)
return
try:
if "bsd" in sys.platform:
# BSD make
call(["make", "-C", os.path.join(paths.codePath(), "bitmsghash"), '-f', 'Makefile.bsd'])
else:
# GNU make
call(["make", "-C", os.path.join(paths.codePath(), "bitmsghash")])
if os.path.exists(os.path.join(paths.codePath(), "bitmsghash", "bitmsghash.so")):
init()
notifyBuild(True)
else:
notifyBuild(True)
except:
notifyBuild(True)
def run(target, initialHash):
"""Run the proof of work thread"""
if state.shutdown != 0:
raise # pylint: disable=misplaced-bare-raise
target = int(target)
if openclpow.openclEnabled():
try:
return _doGPUPoW(target, initialHash)
except StopIteration:
raise
except:
pass # fallback
if bmpow:
try:
return _doCPoW(target, initialHash)
except StopIteration:
raise
except:
pass # fallback
if paths.frozen == "macosx_app" or not paths.frozen:
# on my (Peter Surda) Windows 10, Windows Defender
# does not like this and fights with PyBitmessage
# over CPU, resulting in very slow PoW
# added on 2015-11-29: multiprocesing.freeze_support() doesn't help
try:
return _doFastPoW(target, initialHash)
except StopIteration:
logger.error("Fast PoW got StopIteration")
raise
except:
logger.error("Fast PoW got exception:", exc_info=True)
try:
return _doSafePoW(target, initialHash)
except StopIteration:
raise
except:
pass # fallback
def resetPoW():
"""Initialise the OpenCL PoW"""
openclpow.initCL()
# init
def init():
"""Initialise PoW"""
# pylint: disable=global-statement
global bitmsglib, bmpow
openclpow.initCL()
if sys.platform == "win32":
if ctypes.sizeof(ctypes.c_voidp) == 4:
bitmsglib = 'bitmsghash32.dll'
else:
bitmsglib = 'bitmsghash64.dll'
try:
# MSVS
bso = ctypes.WinDLL(os.path.join(paths.codePath(), "bitmsghash", bitmsglib))
logger.info("Loaded C PoW DLL (stdcall) %s", bitmsglib)
bmpow = bso.BitmessagePOW
bmpow.restype = ctypes.c_ulonglong
_doCPoW(2**63, "")
logger.info("Successfully tested C PoW DLL (stdcall) %s", bitmsglib)
except:
logger.error("C PoW test fail.", exc_info=True)
try:
# MinGW
bso = ctypes.CDLL(os.path.join(paths.codePath(), "bitmsghash", bitmsglib))
logger.info("Loaded C PoW DLL (cdecl) %s", bitmsglib)
bmpow = bso.BitmessagePOW
bmpow.restype = ctypes.c_ulonglong
_doCPoW(2**63, "")
logger.info("Successfully tested C PoW DLL (cdecl) %s", bitmsglib)
except:
logger.error("C PoW test fail.", exc_info=True)
bso = None
else:
try:
bso = ctypes.CDLL(os.path.join(paths.codePath(), "bitmsghash", bitmsglib))
except OSError:
import glob
try:
bso = ctypes.CDLL(glob.glob(os.path.join(
paths.codePath(), "bitmsghash", "bitmsghash*.so"
))[0])
except (OSError, IndexError):
bso = None
except:
bso = None
else:
logger.info("Loaded C PoW DLL %s", bitmsglib)
if bso:
try:
bmpow = bso.BitmessagePOW
bmpow.restype = ctypes.c_ulonglong
except:
bmpow = None
else:
bmpow = None
if bmpow is None:
buildCPoW()