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318 lines
10 KiB
318 lines
10 KiB
# this code comes from ABE. it can probably be simplified
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#
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#
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from bitcoin import public_key_to_bc_address, hash_160_to_bc_address, hash_encode
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#import socket
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import time
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import struct
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#
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# Workalike python implementation of Bitcoin's CDataStream class.
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#
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import struct
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import StringIO
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import mmap
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class SerializationError(Exception):
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""" Thrown when there's a problem deserializing or serializing """
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class BCDataStream(object):
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def __init__(self):
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self.input = None
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self.read_cursor = 0
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def clear(self):
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self.input = None
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self.read_cursor = 0
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def write(self, bytes): # Initialize with string of bytes
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if self.input is None:
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self.input = bytes
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else:
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self.input += bytes
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def map_file(self, file, start): # Initialize with bytes from file
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self.input = mmap.mmap(file.fileno(), 0, access=mmap.ACCESS_READ)
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self.read_cursor = start
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def seek_file(self, position):
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self.read_cursor = position
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def close_file(self):
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self.input.close()
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def read_string(self):
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# Strings are encoded depending on length:
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# 0 to 252 : 1-byte-length followed by bytes (if any)
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# 253 to 65,535 : byte'253' 2-byte-length followed by bytes
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# 65,536 to 4,294,967,295 : byte '254' 4-byte-length followed by bytes
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# ... and the Bitcoin client is coded to understand:
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# greater than 4,294,967,295 : byte '255' 8-byte-length followed by bytes of string
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# ... but I don't think it actually handles any strings that big.
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if self.input is None:
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raise SerializationError("call write(bytes) before trying to deserialize")
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try:
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length = self.read_compact_size()
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except IndexError:
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raise SerializationError("attempt to read past end of buffer")
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return self.read_bytes(length)
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def write_string(self, string):
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# Length-encoded as with read-string
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self.write_compact_size(len(string))
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self.write(string)
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def read_bytes(self, length):
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try:
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result = self.input[self.read_cursor:self.read_cursor+length]
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self.read_cursor += length
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return result
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except IndexError:
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raise SerializationError("attempt to read past end of buffer")
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return ''
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def read_boolean(self): return self.read_bytes(1)[0] != chr(0)
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def read_int16(self): return self._read_num('<h')
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def read_uint16(self): return self._read_num('<H')
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def read_int32(self): return self._read_num('<i')
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def read_uint32(self): return self._read_num('<I')
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def read_int64(self): return self._read_num('<q')
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def read_uint64(self): return self._read_num('<Q')
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def write_boolean(self, val): return self.write(chr(1) if val else chr(0))
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def write_int16(self, val): return self._write_num('<h', val)
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def write_uint16(self, val): return self._write_num('<H', val)
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def write_int32(self, val): return self._write_num('<i', val)
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def write_uint32(self, val): return self._write_num('<I', val)
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def write_int64(self, val): return self._write_num('<q', val)
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def write_uint64(self, val): return self._write_num('<Q', val)
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def read_compact_size(self):
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size = ord(self.input[self.read_cursor])
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self.read_cursor += 1
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if size == 253:
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size = self._read_num('<H')
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elif size == 254:
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size = self._read_num('<I')
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elif size == 255:
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size = self._read_num('<Q')
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return size
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def write_compact_size(self, size):
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if size < 0:
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raise SerializationError("attempt to write size < 0")
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elif size < 253:
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self.write(chr(size))
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elif size < 2**16:
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self.write('\xfd')
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self._write_num('<H', size)
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elif size < 2**32:
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self.write('\xfe')
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self._write_num('<I', size)
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elif size < 2**64:
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self.write('\xff')
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self._write_num('<Q', size)
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def _read_num(self, format):
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(i,) = struct.unpack_from(format, self.input, self.read_cursor)
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self.read_cursor += struct.calcsize(format)
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return i
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def _write_num(self, format, num):
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s = struct.pack(format, num)
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self.write(s)
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#
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# enum-like type
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# From the Python Cookbook, downloaded from http://code.activestate.com/recipes/67107/
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#
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import types, string, exceptions
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class EnumException(exceptions.Exception):
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pass
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class Enumeration:
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def __init__(self, name, enumList):
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self.__doc__ = name
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lookup = { }
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reverseLookup = { }
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i = 0
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uniqueNames = [ ]
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uniqueValues = [ ]
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for x in enumList:
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if type(x) == types.TupleType:
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x, i = x
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if type(x) != types.StringType:
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raise EnumException, "enum name is not a string: " + x
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if type(i) != types.IntType:
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raise EnumException, "enum value is not an integer: " + i
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if x in uniqueNames:
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raise EnumException, "enum name is not unique: " + x
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if i in uniqueValues:
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raise EnumException, "enum value is not unique for " + x
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uniqueNames.append(x)
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uniqueValues.append(i)
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lookup[x] = i
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reverseLookup[i] = x
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i = i + 1
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self.lookup = lookup
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self.reverseLookup = reverseLookup
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def __getattr__(self, attr):
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if not self.lookup.has_key(attr):
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raise AttributeError
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return self.lookup[attr]
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def whatis(self, value):
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return self.reverseLookup[value]
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# This function comes from bitcointools, bct-LICENSE.txt.
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def long_hex(bytes):
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return bytes.encode('hex_codec')
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# This function comes from bitcointools, bct-LICENSE.txt.
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def short_hex(bytes):
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t = bytes.encode('hex_codec')
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if len(t) < 11:
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return t
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return t[0:4]+"..."+t[-4:]
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def parse_TxIn(vds):
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d = {}
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d['prevout_hash'] = hash_encode(vds.read_bytes(32))
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d['prevout_n'] = vds.read_uint32()
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scriptSig = vds.read_bytes(vds.read_compact_size())
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d['sequence'] = vds.read_uint32()
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d['address'] = extract_public_key(scriptSig)
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#d['script'] = decode_script(scriptSig)
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return d
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def parse_TxOut(vds, i):
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d = {}
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d['value'] = vds.read_int64()
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scriptPubKey = vds.read_bytes(vds.read_compact_size())
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d['address'] = extract_public_key(scriptPubKey)
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#d['script'] = decode_script(scriptPubKey)
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d['raw_output_script'] = scriptPubKey.encode('hex')
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d['index'] = i
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return d
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def parse_Transaction(vds):
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d = {}
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start = vds.read_cursor
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d['version'] = vds.read_int32()
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n_vin = vds.read_compact_size()
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d['inputs'] = []
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for i in xrange(n_vin):
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d['inputs'].append(parse_TxIn(vds))
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n_vout = vds.read_compact_size()
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d['outputs'] = []
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for i in xrange(n_vout):
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d['outputs'].append(parse_TxOut(vds, i))
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d['lockTime'] = vds.read_uint32()
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return d
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opcodes = Enumeration("Opcodes", [
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("OP_0", 0), ("OP_PUSHDATA1",76), "OP_PUSHDATA2", "OP_PUSHDATA4", "OP_1NEGATE", "OP_RESERVED",
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"OP_1", "OP_2", "OP_3", "OP_4", "OP_5", "OP_6", "OP_7",
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"OP_8", "OP_9", "OP_10", "OP_11", "OP_12", "OP_13", "OP_14", "OP_15", "OP_16",
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"OP_NOP", "OP_VER", "OP_IF", "OP_NOTIF", "OP_VERIF", "OP_VERNOTIF", "OP_ELSE", "OP_ENDIF", "OP_VERIFY",
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"OP_RETURN", "OP_TOALTSTACK", "OP_FROMALTSTACK", "OP_2DROP", "OP_2DUP", "OP_3DUP", "OP_2OVER", "OP_2ROT", "OP_2SWAP",
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"OP_IFDUP", "OP_DEPTH", "OP_DROP", "OP_DUP", "OP_NIP", "OP_OVER", "OP_PICK", "OP_ROLL", "OP_ROT",
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"OP_SWAP", "OP_TUCK", "OP_CAT", "OP_SUBSTR", "OP_LEFT", "OP_RIGHT", "OP_SIZE", "OP_INVERT", "OP_AND",
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"OP_OR", "OP_XOR", "OP_EQUAL", "OP_EQUALVERIFY", "OP_RESERVED1", "OP_RESERVED2", "OP_1ADD", "OP_1SUB", "OP_2MUL",
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"OP_2DIV", "OP_NEGATE", "OP_ABS", "OP_NOT", "OP_0NOTEQUAL", "OP_ADD", "OP_SUB", "OP_MUL", "OP_DIV",
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"OP_MOD", "OP_LSHIFT", "OP_RSHIFT", "OP_BOOLAND", "OP_BOOLOR",
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"OP_NUMEQUAL", "OP_NUMEQUALVERIFY", "OP_NUMNOTEQUAL", "OP_LESSTHAN",
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"OP_GREATERTHAN", "OP_LESSTHANOREQUAL", "OP_GREATERTHANOREQUAL", "OP_MIN", "OP_MAX",
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"OP_WITHIN", "OP_RIPEMD160", "OP_SHA1", "OP_SHA256", "OP_HASH160",
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"OP_HASH256", "OP_CODESEPARATOR", "OP_CHECKSIG", "OP_CHECKSIGVERIFY", "OP_CHECKMULTISIG",
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"OP_CHECKMULTISIGVERIFY",
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("OP_SINGLEBYTE_END", 0xF0),
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("OP_DOUBLEBYTE_BEGIN", 0xF000),
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"OP_PUBKEY", "OP_PUBKEYHASH",
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("OP_INVALIDOPCODE", 0xFFFF),
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])
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def script_GetOp(bytes):
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i = 0
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while i < len(bytes):
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vch = None
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opcode = ord(bytes[i])
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i += 1
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if opcode >= opcodes.OP_SINGLEBYTE_END:
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opcode <<= 8
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opcode |= ord(bytes[i])
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i += 1
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if opcode <= opcodes.OP_PUSHDATA4:
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nSize = opcode
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if opcode == opcodes.OP_PUSHDATA1:
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nSize = ord(bytes[i])
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i += 1
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elif opcode == opcodes.OP_PUSHDATA2:
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(nSize,) = struct.unpack_from('<H', bytes, i)
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i += 2
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elif opcode == opcodes.OP_PUSHDATA4:
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(nSize,) = struct.unpack_from('<I', bytes, i)
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i += 4
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vch = bytes[i:i+nSize]
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i += nSize
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yield (opcode, vch, i)
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def script_GetOpName(opcode):
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return (opcodes.whatis(opcode)).replace("OP_", "")
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def decode_script(bytes):
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result = ''
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for (opcode, vch, i) in script_GetOp(bytes):
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if len(result) > 0: result += " "
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if opcode <= opcodes.OP_PUSHDATA4:
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result += "%d:"%(opcode,)
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result += short_hex(vch)
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else:
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result += script_GetOpName(opcode)
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return result
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def match_decoded(decoded, to_match):
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if len(decoded) != len(to_match):
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return False;
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for i in range(len(decoded)):
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if to_match[i] == opcodes.OP_PUSHDATA4 and decoded[i][0] <= opcodes.OP_PUSHDATA4:
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continue # Opcodes below OP_PUSHDATA4 all just push data onto stack, and are equivalent.
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if to_match[i] != decoded[i][0]:
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return False
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return True
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def extract_public_key(bytes):
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decoded = [ x for x in script_GetOp(bytes) ]
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# non-generated TxIn transactions push a signature
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# (seventy-something bytes) and then their public key
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# (65 bytes) onto the stack:
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match = [ opcodes.OP_PUSHDATA4, opcodes.OP_PUSHDATA4 ]
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if match_decoded(decoded, match):
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return public_key_to_bc_address(decoded[1][1])
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# The Genesis Block, self-payments, and pay-by-IP-address payments look like:
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# 65 BYTES:... CHECKSIG
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match = [ opcodes.OP_PUSHDATA4, opcodes.OP_CHECKSIG ]
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if match_decoded(decoded, match):
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return public_key_to_bc_address(decoded[0][1])
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# Pay-by-Bitcoin-address TxOuts look like:
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# DUP HASH160 20 BYTES:... EQUALVERIFY CHECKSIG
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match = [ opcodes.OP_DUP, opcodes.OP_HASH160, opcodes.OP_PUSHDATA4, opcodes.OP_EQUALVERIFY, opcodes.OP_CHECKSIG ]
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if match_decoded(decoded, match):
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return hash_160_to_bc_address(decoded[2][1])
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return "(None)"
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