2 Representation of a getwork request/reply
5 from __future__ import division
7 from . import data as bitcoin_data
11 return ''.join(s[x:x+l][::-1] for x in xrange(0, len(s), l))
13 class BlockAttempt(object):
14 def __init__(self, version, previous_block, merkle_root, timestamp, target, target2=None):
17 self.version, self.previous_block, self.merkle_root, self.timestamp, self.target, self.target2 = version, previous_block, merkle_root, timestamp, target, target2
20 return hash((self.version, self.previous_block, self.merkle_root, self.timestamp, self.target, self.target2))
22 def __eq__(self, other):
23 if not isinstance(other, BlockAttempt):
24 raise ValueError('comparisons only valid with other BlockAttempts')
25 return self.__dict__ == other.__dict__
27 def __ne__(self, other):
28 return not (self == other)
31 return 'BlockAttempt(%s)' % (', '.join('%s=%r' % (k, v) for k, v in self.__dict__.iteritems()),)
33 def getwork(self, _check=3):
34 block_data = bitcoin_data.block_header_type.pack(dict(
36 previous_block=self.previous_block,
37 merkle_root=self.merkle_root,
38 timestamp=self.timestamp,
44 'data': _swap(block_data, 4).encode('hex') + '000000800000000000000000000000000000000000000000000000000000000000000000000000000000000080020000',
45 'hash1': '00000000000000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000010000',
46 'target': ('%064x' % (self.target2,)).decode('hex')[::-1].encode('hex'),
47 'midstate': _swap(sha256.process(block_data[:64]), 4).encode('hex'),
51 self2 = self.__class__.from_getwork(getwork, _check=_check - 1)
53 raise ValueError('failed check - input invalid or implementation error')
58 def from_getwork(cls, getwork, _check=3):
59 attrs = dict(decode_data(getwork['data']))
61 attrs['target2'] = int(getwork['target'].decode('hex')[::-1].encode('hex'), 16)
66 getwork2 = ba.getwork(_check=_check - 1)
67 if getwork2 != getwork:
68 raise ValueError('failed check - input invalid or implementation error')
72 def update(self, **kwargs):
73 d = self.__dict__.copy()
75 return self.__class__(**d)
77 def decode_data(data):
78 return bitcoin_data.block_header_type.unpack(_swap(data.decode('hex'), 4)[:80])
80 if __name__ == '__main__':
81 BlockAttempt.from_getwork({
82 'target': '0000000000000000000000000000000000000000000000f2b944000000000000',
83 'midstate': '5982f893102dec03e374b472647c4f19b1b6d21ae4b2ac624f3d2f41b9719404',
84 'hash1': '00000000000000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000010000',
85 'data': '0000000163930d52a5ffca79b29b95a659a302cd4e1654194780499000002274000000002e133d9e51f45bc0886d05252038e421e82bff18b67dc14b90d9c3c2f422cd5c4dd4598e1a44b9f200000000000000800000000000000000000000000000000000000000000000000000000000000000000000000000000080020000'
87 BlockAttempt.from_getwork({
88 'midstate' : 'f4a9b048c0cb9791bc94b13ee0eec21e713963d524fd140b58bb754dd7b0955f',
89 'data' : '000000019a1d7342fb62090bda686b22d90f9f73d0f5c418b9c980cd0000011a00000000680b07c8a2f97ecd831f951806857e09f98a3b81cdef1fa71982934fef8dc3444e18585d1a0abbcf00000000000000800000000000000000000000000000000000000000000000000000000000000000000000000000000080020000',
90 'hash1' : '00000000000000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000010000',
91 'target' : '0000000000000000000000000000000000000000000000cfbb0a000000000000'
95 0x148135e10208db85abb62754341a392eab1f186aab077a831cf7,
96 0x534ea08be1ab529f484369344b6d5423ef5a0767db9b3ebb4e182bbb67962520,
98 0x44b9f20000000000000000000000000000000000000000000000,
103 0x148135e10208db85abb62754341a392eab1f186aab077a831cf7,
104 0x534ea08be1ab529f484369344b6d5423ef5a0767db9b3ebb4e182bbb67962520,
106 0x44b9f20000000000000000000000000000000000000000000000,
112 0x148135e10208db85abb62754341a392eab1f186aab077a831cf7,
113 0x534ea08be1ab529f484369344b6d5423ef5a0767db9b3ebb4e182bbb67962520,
115 0x44b9f20000000000000000000000000000000000000000000000,
120 ba.getwork(_check=100)
121 ba.update(previous_block=ba.previous_block - 10).getwork(_check=100)