403 lines
12 KiB
Python
403 lines
12 KiB
Python
# pylint: disable=too-many-branches,too-many-statements,protected-access
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"""
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Proof of work calculation
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"""
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import ctypes
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import os
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import sys
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import tempfile
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import time
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from struct import pack, unpack
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from subprocess import call # nosec B404
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import highlevelcrypto
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import openclpow
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import paths
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import queues
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import state
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import tr
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from bmconfigparser import config
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from debug import logger
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bitmsglib = 'bitmsghash.so'
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bmpow = None
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class LogOutput(object): # pylint: disable=too-few-public-methods
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"""
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A context manager that block stdout for its scope
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and appends it's content to log before exit. Usage::
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with LogOutput():
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os.system('ls -l')
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https://stackoverflow.com/questions/5081657
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"""
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def __init__(self, prefix='PoW'):
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self.prefix = prefix
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try:
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sys.stdout.flush()
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self._stdout = sys.stdout
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self._stdout_fno = os.dup(sys.stdout.fileno())
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except AttributeError:
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# NullWriter instance has no attribute 'fileno' on Windows
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self._stdout = None
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else:
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self._dst, self._filepath = tempfile.mkstemp()
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def __enter__(self):
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if not self._stdout:
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return
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stdout = os.dup(1)
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os.dup2(self._dst, 1)
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os.close(self._dst)
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sys.stdout = os.fdopen(stdout, 'w')
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def __exit__(self, exc_type, exc_val, exc_tb):
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if not self._stdout:
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return
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sys.stdout.close()
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sys.stdout = self._stdout
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sys.stdout.flush()
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os.dup2(self._stdout_fno, 1)
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with open(self._filepath) as out:
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for line in out:
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logger.info('%s: %s', self.prefix, line)
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os.remove(self._filepath)
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def _set_idle():
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if 'linux' in sys.platform:
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os.nice(20)
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else:
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try:
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# pylint: disable=no-member,import-error
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sys.getwindowsversion()
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import win32api
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import win32process
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import win32con
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pid = win32api.GetCurrentProcessId()
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handle = win32api.OpenProcess(win32con.PROCESS_ALL_ACCESS, True, pid)
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win32process.SetPriorityClass(handle, win32process.IDLE_PRIORITY_CLASS)
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except: # nosec B110 # noqa:E722 # pylint:disable=bare-except
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# Windows 64-bit
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pass
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def trial_value(nonce, initialHash):
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"""Calculate PoW trial value"""
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trialValue, = unpack(
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'>Q', highlevelcrypto.double_sha512(
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pack('>Q', nonce) + initialHash)[0:8])
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return trialValue
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def _pool_worker(nonce, initialHash, target, pool_size):
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_set_idle()
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trialValue = float('inf')
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while trialValue > target:
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nonce += pool_size
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trialValue = trial_value(nonce, initialHash)
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return [trialValue, nonce]
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def _doSafePoW(target, initialHash):
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logger.debug("Safe PoW start")
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nonce = 0
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trialValue = float('inf')
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while trialValue > target and state.shutdown == 0:
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nonce += 1
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trialValue = trial_value(nonce, initialHash)
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if state.shutdown != 0:
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raise StopIteration("Interrupted")
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logger.debug("Safe PoW done")
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return [trialValue, nonce]
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def _doFastPoW(target, initialHash):
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logger.debug("Fast PoW start")
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from multiprocessing import Pool, cpu_count
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try:
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pool_size = cpu_count()
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except: # noqa:E722
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pool_size = 4
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try:
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maxCores = config.getint('bitmessagesettings', 'maxcores')
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except: # noqa:E722
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maxCores = 99999
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if pool_size > maxCores:
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pool_size = maxCores
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pool = Pool(processes=pool_size)
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result = []
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for i in range(pool_size):
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result.append(pool.apply_async(_pool_worker, args=(i, initialHash, target, pool_size)))
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while True:
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if state.shutdown > 0:
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try:
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pool.terminate()
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pool.join()
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except: # nosec B110 # noqa:E722 # pylint:disable=bare-except
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pass
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raise StopIteration("Interrupted")
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for i in range(pool_size):
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if result[i].ready():
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try:
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result[i].successful()
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except AssertionError:
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pool.terminate()
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pool.join()
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raise StopIteration("Interrupted")
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result = result[i].get()
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pool.terminate()
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pool.join()
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logger.debug("Fast PoW done")
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return result[0], result[1]
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time.sleep(0.2)
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def _doCPoW(target, initialHash):
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with LogOutput():
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h = initialHash
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m = target
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out_h = ctypes.pointer(ctypes.create_string_buffer(h, 64))
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out_m = ctypes.c_ulonglong(m)
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logger.debug("C PoW start")
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nonce = bmpow(out_h, out_m)
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trialValue = trial_value(nonce, initialHash)
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if state.shutdown != 0:
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raise StopIteration("Interrupted")
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logger.debug("C PoW done")
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return [trialValue, nonce]
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def _doGPUPoW(target, initialHash):
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logger.debug("GPU PoW start")
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nonce = openclpow.do_opencl_pow(initialHash.encode("hex"), target)
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trialValue = trial_value(nonce, initialHash)
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if trialValue > target:
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deviceNames = ", ".join(gpu.name for gpu in openclpow.enabledGpus)
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queues.UISignalQueue.put((
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'updateStatusBar', (
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tr._translate(
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"MainWindow",
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'Your GPU(s) did not calculate correctly, disabling OpenCL. Please report to the developers.'
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),
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1)))
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logger.error(
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"Your GPUs (%s) did not calculate correctly, disabling OpenCL. Please report to the developers.",
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deviceNames)
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openclpow.enabledGpus = []
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raise Exception("GPU did not calculate correctly.")
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if state.shutdown != 0:
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raise StopIteration("Interrupted")
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logger.debug("GPU PoW done")
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return [trialValue, nonce]
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def estimate(difficulty, format=False): # pylint: disable=redefined-builtin
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"""
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.. todo: fix unused variable
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"""
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ret = difficulty / 10
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if ret < 1:
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ret = 1
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if format:
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# pylint: disable=unused-variable
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out = str(int(ret)) + " seconds"
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if ret > 60:
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ret /= 60
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out = str(int(ret)) + " minutes"
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if ret > 60:
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ret /= 60
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out = str(int(ret)) + " hours"
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if ret > 24:
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ret /= 24
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out = str(int(ret)) + " days"
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if ret > 7:
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out = str(int(ret)) + " weeks"
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if ret > 31:
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out = str(int(ret)) + " months"
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if ret > 366:
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ret /= 366
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out = str(int(ret)) + " years"
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ret = None # Ensure legacy behaviour
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return ret
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def getPowType():
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"""Get the proof of work implementation"""
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if openclpow.openclEnabled():
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return "OpenCL"
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if bmpow:
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return "C"
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return "python"
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def notifyBuild(tried=False):
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"""Notify the user of the success or otherwise of building the PoW C module"""
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if bmpow:
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queues.UISignalQueue.put(('updateStatusBar', (tr._translate(
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"proofofwork", "C PoW module built successfully."), 1)))
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elif tried:
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queues.UISignalQueue.put(
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(
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'updateStatusBar', (
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tr._translate(
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"proofofwork",
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"Failed to build C PoW module. Please build it manually."
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),
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1
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)
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)
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)
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else:
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queues.UISignalQueue.put(('updateStatusBar', (tr._translate(
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"proofofwork", "C PoW module unavailable. Please build it."), 1)))
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def buildCPoW():
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"""Attempt to build the PoW C module"""
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if bmpow is not None:
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return
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if paths.frozen is not None:
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notifyBuild(False)
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return
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if sys.platform in ["win32", "win64"]:
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notifyBuild(False)
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return
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try:
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if "bsd" in sys.platform:
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# BSD make
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call(["make", "-C", os.path.join(paths.codePath(), "bitmsghash"),
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'-f', 'Makefile.bsd']) # nosec B607, B603
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else:
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# GNU make
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call([ # nosec B607, B603
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"make", "-C", os.path.join(paths.codePath(), "bitmsghash")])
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if os.path.exists(os.path.join(paths.codePath(), "bitmsghash", "bitmsghash.so")):
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init()
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notifyBuild(True)
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else:
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notifyBuild(True)
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except: # noqa:E722
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notifyBuild(True)
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def run(target, initialHash):
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"""Run the proof of work thread"""
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if state.shutdown != 0:
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raise # pylint: disable=misplaced-bare-raise
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target = int(target)
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if openclpow.openclEnabled():
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try:
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return _doGPUPoW(target, initialHash)
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except StopIteration:
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raise
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except: # nosec B110 # noqa:E722 # pylint:disable=bare-except
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pass # fallback
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if bmpow:
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try:
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return _doCPoW(target, initialHash)
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except StopIteration:
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raise
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except: # nosec B110 # noqa:E722 # pylint:disable=bare-except
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pass # fallback
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if paths.frozen == "macosx_app" or not paths.frozen:
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# on my (Peter Surda) Windows 10, Windows Defender
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# does not like this and fights with PyBitmessage
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# over CPU, resulting in very slow PoW
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# added on 2015-11-29: multiprocesing.freeze_support() doesn't help
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try:
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return _doFastPoW(target, initialHash)
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except StopIteration:
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logger.error("Fast PoW got StopIteration")
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raise
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except: # noqa:E722 # pylint:disable=bare-except
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logger.error("Fast PoW got exception:", exc_info=True)
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try:
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return _doSafePoW(target, initialHash)
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except StopIteration:
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raise
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except: # nosec B110 # noqa:E722 # pylint:disable=bare-except
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pass # fallback
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def resetPoW():
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"""Initialise the OpenCL PoW"""
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openclpow.initCL()
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# init
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def init():
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"""Initialise PoW"""
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# pylint: disable=global-statement
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global bitmsglib, bmpow
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openclpow.initCL()
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if sys.platform == "win32":
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if ctypes.sizeof(ctypes.c_voidp) == 4:
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bitmsglib = 'bitmsghash32.dll'
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else:
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bitmsglib = 'bitmsghash64.dll'
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try:
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# MSVS
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bso = ctypes.WinDLL(os.path.join(paths.codePath(), "bitmsghash", bitmsglib))
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logger.info("Loaded C PoW DLL (stdcall) %s", bitmsglib)
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bmpow = bso.BitmessagePOW
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bmpow.restype = ctypes.c_ulonglong
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_doCPoW(2**63, "")
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logger.info("Successfully tested C PoW DLL (stdcall) %s", bitmsglib)
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except ValueError:
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try:
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# MinGW
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bso = ctypes.CDLL(os.path.join(paths.codePath(), "bitmsghash", bitmsglib))
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logger.info("Loaded C PoW DLL (cdecl) %s", bitmsglib)
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bmpow = bso.BitmessagePOW
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bmpow.restype = ctypes.c_ulonglong
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_doCPoW(2**63, "")
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logger.info("Successfully tested C PoW DLL (cdecl) %s", bitmsglib)
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except Exception as e:
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logger.error("Error: %s", e, exc_info=True)
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bso = None
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except Exception as e:
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logger.error("Error: %s", e, exc_info=True)
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bso = None
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else:
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try:
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bso = ctypes.CDLL(os.path.join(paths.codePath(), "bitmsghash", bitmsglib))
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except OSError:
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import glob
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try:
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bso = ctypes.CDLL(glob.glob(os.path.join(
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paths.codePath(), "bitmsghash", "bitmsghash*.so"
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))[0])
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except (OSError, IndexError):
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bso = None
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except: # noqa:E722
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bso = None
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else:
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logger.info("Loaded C PoW DLL %s", bitmsglib)
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if bso:
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try:
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bmpow = bso.BitmessagePOW
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bmpow.restype = ctypes.c_ulonglong
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except: # noqa:E722
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bmpow = None
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else:
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bmpow = None
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if bmpow is None:
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buildCPoW()
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