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block.py
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block.py
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from blocktools import *
from opcode import *
from datetime import datetime
import time
class BlockHeader:
def __init__(self, blockchain):
self.version = uint4(blockchain)
self.previousHash = hash32(blockchain)
self.merkleHash = hash32(blockchain)
self.time = uint4(blockchain)
self.bits = uint4(blockchain)
self.nonce = uint4(blockchain)
def toString(self):
print "Version:\t %d" % self.version
print "Previous Hash\t %s" % hashStr(self.previousHash)
print "Merkle Root\t %s" % hashStr(self.merkleHash)
print "Time stamp\t "+ self.decodeTime(self.time)
print "Difficulty\t %d" % self.bits
print "Nonce\t\t %s" % self.nonce
def decodeTime(self, time):
utc_time = datetime.utcfromtimestamp(time)
return utc_time.strftime("%Y-%m-%d %H:%M:%S.%f+00:00 (UTC)")
class Block:
def __init__(self, blockchain):
self.continueParsing = True
self.magicNum = 0
self.blocksize = 0
self.blockheader = ''
self.txCount = 0
self.Txs = []
if self.hasLength(blockchain, 8):
self.magicNum = uint4(blockchain)
self.blocksize = uint4(blockchain)
else:
self.continueParsing = False
return
if self.hasLength(blockchain, self.blocksize):
self.setHeader(blockchain)
self.txCount = varint(blockchain)
self.Txs = []
for i in range(0, self.txCount):
tx = Tx(blockchain)
tx.seq = i
self.Txs.append(tx)
else:
self.continueParsing = False
def continueParsing(self):
return self.continueParsing
def getBlocksize(self):
return self.blocksize
def hasLength(self, blockchain, size):
curPos = blockchain.tell()
blockchain.seek(0, 2)
fileSize = blockchain.tell()
blockchain.seek(curPos)
tempBlockSize = fileSize - curPos
# print "tempBlockSize \t %d" % tempBlockSize
if tempBlockSize < size:
return False
return True
def setHeader(self, blockchain):
self.blockHeader = BlockHeader(blockchain)
def toString(self):
print ""
print "Magic No: \t%8x" % self.magicNum
print "Blocksize: \t", self.blocksize
print ""
print "#"*10 + " Block Header " + "#"*10
self.blockHeader.toString()
print
print "##### Tx Count: %d" % self.txCount
for t in self.Txs:
t.toString()
print "#### end of all %d transactins" % self.txCount
class Tx:
def __init__(self, blockchain):
self.version = uint4(blockchain)
self.inCount = varint(blockchain)
self.inputs = []
self.seq = 1
for i in range(0, self.inCount):
input = txInput(blockchain)
self.inputs.append(input)
self.outCount = varint(blockchain)
self.outputs = []
if self.outCount > 0:
for i in range(0, self.outCount):
output = txOutput(blockchain)
self.outputs.append(output)
self.lockTime = uint4(blockchain)
def toString(self):
print ""
print "="*20 + " No. %s " %self.seq + "Transaction " + "="*20
print "Tx Version:\t %d" % self.version
print "Inputs:\t\t %d" % self.inCount
for i in self.inputs:
i.toString()
print "Outputs:\t %d" % self.outCount
for o in self.outputs:
o.toString()
print "Lock Time:\t %d" % self.lockTime
class txInput:
def __init__(self, blockchain):
self.prevhash = hash32(blockchain)
self.txOutId = uint4(blockchain)
self.scriptLen = varint(blockchain)
self.scriptSig = blockchain.read(self.scriptLen)
self.seqNo = uint4(blockchain)
def toString(self):
# print "\tPrev. Tx Hash:\t %s" % hashStr(self.prevhash)
print "\tTx Out Index:\t %s" % self.decodeOutIdx(self.txOutId)
print "\tScript Length:\t %d" % self.scriptLen
# print "\tScriptSig:\t %s" %
self.decodeScriptSig(self.scriptSig)
print "\tSequence:\t %8x" % self.seqNo
def decodeScriptSig(self,data):
hexstr = hashStr(data)
if 0xffffffff == self.txOutId: #Coinbase
return hexstr
scriptLen = int(hexstr[0:2],16)
scriptLen *= 2
script = hexstr[2:2+scriptLen]
print "\tScript:\t\t " + script
if SIGHASH_ALL != int(hexstr[scriptLen:scriptLen+2],16): # should be 0x01
print "\t Script op_code is not SIGHASH_ALL"
return hexstr
else:
pubkey = hexstr[2+scriptLen+2:2+scriptLen+2+66]
print " \tInPubkey:\t " + pubkey
# return hexstr
def decodeOutIdx(self,idx):
s = ""
if(idx == 0xffffffff):
s = " Coinbase with special index"
print "\tCoinbase Text:\t %s" % hashStr(self.prevhash).decode("utf-8")
else:
print "\tPrev. Tx Hash:\t %s" % hashStr(self.prevhash)
return "%8x"%idx + s
class txOutput:
def __init__(self, blockchain):
self.value = uint8(blockchain)
self.scriptLen = varint(blockchain)
self.pubkey = blockchain.read(self.scriptLen)
def toString(self):
print "\tValue:\t\t %d" % self.value + " Satoshi"
print "\tScript Len:\t %d" % self.scriptLen
print "\tScriptPubkey:\t %s" % self.decodeScriptPubkey(self.pubkey)
def decodeScriptPubkey(self,data):
hexstr = hashStr(data)
op_idx = int(hexstr[0:2],16)
try:
op_code1 = OPCODE_NAMES[op_idx]
except KeyError: #Obselete pay to pubkey directly
print " \tOP_CODE %d is probably obselete pay to address"
keylen = op_idx
op_codeTail = OPCODE_NAMES[int(hexstr[2+keylen*2:2+keylen*2+2],16)]
print " \tPubkey OP_CODE:\t " "None " + "Bytes:%d " % keylen +\
"tail_op_code:" + op_codeTail + " "
print "\tPure Pubkey:\t %s" % hexstr[2:2+keylen*2]
return hexstr
if op_code1 == "OP_DUP": #P2PKHA pay to pubkey hash mode
op_code2 = OPCODE_NAMES[int(hexstr[2:4],16)] + " "
keylen = int(hexstr[4:6],16)
op_codeTail2nd = OPCODE_NAMES[int(hexstr[6+keylen*2:6+keylen*2+2],16)]
op_codeTailLast = OPCODE_NAMES[int(hexstr[6+keylen*2+2:6+keylen*2+4],16)]
print " \tPubkey OP_CODE:\t " + op_code1 + " " + op_code2 + " " + "Bytes:%d " % keylen +\
"tail_op_code:" + op_codeTail2nd + " " + op_codeTailLast
print "\tPubkeyHash:\t %s" % hexstr[6:6+keylen*2]
return hexstr
elif op_code1 == "OP_HASH160": #P2SHA pay to script hash
keylen = int(hexstr[2:4],16)
op_codeTail = OPCODE_NAMES[int(hexstr[4+keylen*2:4+keylen*2+2],16)]
print " \tPubkey OP_CODE:\t " + op_code1 + " " + " " + "Bytes:%d " % keylen +\
"tail_op_code:" + op_codeTail + " "
print "\tPure Pubkey:\t %s" % hexstr[4:4+keylen*2]
return hexstr
else: #TODO extend for multi-signature parsing
print "\t Need to extend multi-signatuer parsing %x" % int(hexstr[0:2],16) + op_code1
return hexstr