Beginnings of dynamic targetting support
[bitcoin:eloipool.git] / jsonrpc_getwork.py
1 # Eloipool - Python Bitcoin pool server
2 # Copyright (C) 2011-2012  Luke Dashjr <luke-jr+eloipool@utopios.org>
3 #
4 # This program is free software: you can redistribute it and/or modify
5 # it under the terms of the GNU Affero General Public License as
6 # published by the Free Software Foundation, either version 3 of the
7 # License, or (at your option) any later version.
8 #
9 # This program is distributed in the hope that it will be useful,
10 # but WITHOUT ANY WARRANTY; without even the implied warranty of
11 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12 # GNU Affero General Public License for more details.
13 #
14 # You should have received a copy of the GNU Affero General Public License
15 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
16
17 from binascii import b2a_hex
18 from jsonrpcserver import JSONRPCHandler
19 import logging
20 try:
21         import midstate
22         assert midstate.SHA256(b'This is just a test, ignore it. I am making it over 64-bytes long.')[:8] == (0x755f1a94, 0x999b270c, 0xf358c014, 0xfd39caeb, 0x0dcc9ebc, 0x4694cd1a, 0x8e95678e, 0x75fac450)
23 except:
24         logging.getLogger('jsonrpc_getwork').warning('Error importing \'midstate\' module; work will not provide midstates')
25         midstate = None
26 from struct import pack
27 from util import RejectedShare, swap32
28
29 _CheckForDupesHACK = {}
30 _RealDupes = {}
31 class _getwork:
32         def final_init(server):
33                 ShareTargetHex = '%064x' % (server.ShareTarget,)
34                 ShareTargetHexLE = b2a_hex(bytes.fromhex(ShareTargetHex)[::-1]).decode('ascii')
35                 JSONRPCHandler.getwork_rv_template['target'] = ShareTargetHexLE
36         
37         getwork_rv_template = {
38                 'data': '000000800000000000000000000000000000000000000000000000000000000000000000000000000000000080020000',
39                 'target': 'ffffffffffffffffffffffffffffffffffffffffffffffffffffffff00000000',
40                 'hash1': '00000000000000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000010000',
41         }
42         def doJSON_getwork(self, data=None):
43                 if not data is None:
44                         return self.doJSON_submitwork(data)
45                 rv = dict(self.getwork_rv_template)
46                 hdr = self.server.getBlockHeader(self.Username)
47                 if isinstance(hdr, tuple):
48                         (hdr, x, target) = hdr
49                 else:
50                         x = None
51                         target = server.ShareTarget
52                 
53                 # FIXME: this assumption breaks with internal rollntime
54                 # NOTE: noncerange needs to set nonce to start value at least
55                 global _CheckForDupesHACK
56                 uhdr = hdr[:68] + hdr[72:]
57                 if uhdr in _CheckForDupesHACK:
58                         _RealDupes[uhdr] = (_CheckForDupesHACK[uhdr], (hdr, x))
59                         raise self.server.RaiseRedFlags(RuntimeError('issuing duplicate work'))
60                 _CheckForDupesHACK[uhdr] = (hdr, x)
61                 
62                 data = b2a_hex(swap32(hdr)).decode('utf8') + rv['data']
63                 # TODO: endian shuffle etc
64                 rv['data'] = data
65                 if midstate and 'midstate' not in self.extensions and 'midstate' not in self.quirks:
66                         h = midstate.SHA256(hdr)[:8]
67                         rv['midstate'] = b2a_hex(pack('<LLLLLLLL', *h)).decode('ascii')
68                 
69                 ShareTargetHex = '%064x' % (target,)
70                 ShareTargetHexLE = b2a_hex(bytes.fromhex(ShareTargetHex)[::-1]).decode('ascii')
71                 rv['target'] = ShareTargetHexLE
72                 
73                 return rv
74         
75         def doJSON_submitwork(self, datax):
76                 data = swap32(bytes.fromhex(datax))[:80]
77                 share = {
78                         'data': data,
79                         '_origdata' : datax,
80                         'username': self.Username,
81                         'remoteHost': self.remoteHost,
82                 }
83                 try:
84                         self.server.receiveShare(share)
85                 except RejectedShare as rej:
86                         self._JSONHeaders['X-Reject-Reason'] = str(rej)
87                         return False
88                 return True
89
90 JSONRPCHandler._register(_getwork)