PyBitmessage-2021-04-27/src/proofofwork.py

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#import shared
#import time
#from multiprocessing import Pool, cpu_count
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import hashlib
from struct import unpack, pack
import sys
from shared import config, frozen, codePath
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import shared
import openclpow
import os
import ctypes
bitmsglib = 'bitmsghash.so'
if "win32" == sys.platform:
if ctypes.sizeof(ctypes.c_voidp) == 4:
bitmsglib = 'bitmsghash32.dll'
else:
bitmsglib = 'bitmsghash64.dll'
try:
bso = ctypes.WinDLL(os.path.join(codePath(), "bitmsghash", bitmsglib))
except:
bso = None
else:
try:
bso = ctypes.CDLL(os.path.join(codePath(), "bitmsghash", bitmsglib))
except:
bso = None
if bso:
try:
bmpow = bso.BitmessagePOW
bmpow.restype = ctypes.c_ulonglong
except:
bmpow = None
else:
bmpow = None
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def _set_idle():
if 'linux' in sys.platform:
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import os
os.nice(20) # @UndefinedVariable
else:
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try:
sys.getwindowsversion()
import win32api,win32process,win32con # @UnresolvedImport
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pid = win32api.GetCurrentProcessId()
handle = win32api.OpenProcess(win32con.PROCESS_ALL_ACCESS, True, pid)
win32process.SetPriorityClass(handle, win32process.IDLE_PRIORITY_CLASS)
except:
#Windows 64-bit
pass
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def _pool_worker(nonce, initialHash, target, pool_size):
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_set_idle()
trialValue = float('inf')
while trialValue > target:
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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):
print "Safe POW\n"
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nonce = 0
trialValue = float('inf')
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while trialValue > target:
nonce += 1
trialValue, = unpack('>Q',hashlib.sha512(hashlib.sha512(pack('>Q',nonce) + initialHash).digest()).digest()[0:8])
return [trialValue, nonce]
def _doFastPoW(target, initialHash):
print "Fast POW\n"
import time
from multiprocessing import Pool, cpu_count
try:
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pool_size = cpu_count()
except:
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pool_size = 4
try:
maxCores = config.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):
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result.append(pool.apply_async(_pool_worker, args = (i, initialHash, target, pool_size)))
while True:
if shared.shutdown >= 1:
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pool.terminate()
while True:
time.sleep(10) # Don't let this thread return here; it will return nothing and cause an exception in bitmessagemain.py
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return
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for i in range(pool_size):
if result[i].ready():
result = result[i].get()
pool.terminate()
pool.join() #Wait for the workers to exit...
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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)
print "C PoW start"
nonce = bmpow(out_h, out_m)
trialValue, = unpack('>Q',hashlib.sha512(hashlib.sha512(pack('>Q',nonce) + initialHash).digest()).digest()[0:8])
print "C PoW done"
return [trialValue, nonce]
def _doGPUPoW(target, initialHash):
print "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])
#print "{} - value {} < {}".format(nonce, trialValue, target)
print "GPU PoW done"
return [trialValue, nonce]
def run(target, initialHash):
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target = int(target)
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if shared.safeConfigGetBoolean('bitmessagesettings', 'opencl') and openclpow.has_opencl():
# trialvalue1, nonce1 = _doGPUPoW(target, initialHash)
# trialvalue, nonce = _doFastPoW(target, initialHash)
# print "GPU: %s, %s" % (trialvalue1, nonce1)
# print "Fast: %s, %s" % (trialvalue, nonce)
# return [trialvalue, nonce]
try:
return _doGPUPoW(target, initialHash)
except:
pass # fallback
if bmpow:
try:
return _doCPoW(target, initialHash)
except:
pass # fallback
if frozen == "macosx_app" or not frozen:
# on my (Peter Surda) Windows 10, Windows Defender
# does not like this and fights with PyBitmessage
# over CPU, resulting in very slow PoW
try:
return _doFastPoW(target, initialHash)
except:
pass #fallback
return _doSafePoW(target, initialHash)