util.py

   1 from hashlib import sha256
   2 from struct import unpack
   3 import traceback
   4
   5 def dblsha(b):
   6         return sha256(sha256(b).digest()).digest()
   7
   8 def swap32(b):
   9         o = b''
  10         for i in range(0, len(b), 4):
  11                 o += b[i + 3:i - 1 if i else None:-1]
  12         return o
  13
  14 def Bits2Target(bits):
  15         return unpack('<L', bits[:3] + b'\0')[0] * 2**(8*(bits[3] - 3))
  16
  17 def hash2int(h):
  18         n = unpack('<QQQQ', h)
  19         n = (n[3] << 192) | (n[2] << 128) | (n[1] << 64) | n[0]
  20         return n
  21
  22 def tryErr(logger, func, *a, **kw):
  23         try:
  24                 return func(*a, **kw)
  25         except:
  26                 logger.error(traceback.format_exc())
  27                 return None
  28
  29 class RejectedShare(ValueError):
  30         pass