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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 = []
try:
self.setHeader(blockchain)
self.txCount = varint(blockchain)
self.Txs = []
for i in range(self.txCount):
tx = Tx(blockchain)
tx.seq = i
self.Txs.append(tx)
except:
pass
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
if tempBlockSize < size:
return False
return True
def setHeader(self, blockchain):
try:
self.blockHeader = BlockHeader(blockchain)
except:
pass
def toString(self):
print("")
print("#" * 10 + " Block Header " + "#" * 10)
self.blockHeader.toString()
print()
print("##### Tx Count: %d" % self.txCount)
for t in self.Txs[:5]:
t.toString()
time.sleep(1)
print("#### totally %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(self.inCount):
input = txInput(blockchain)
self.inputs.append(input)
self.outCount = varint(blockchain)
self.outputs = []
if self.outCount > 0:
for i in range(self.outCount):
output = txOutput(blockchain)
self.outputs.append(output)
self.lockTime = uint4(blockchain)
def toString(self):
print("")
print("=" * 20 + " No. %s " % (self.seq + 1) + "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)
time.sleep(1)
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("\tTx Out Index:\t %s" % self.decodeOutIdx(self.txOutId))
print("\tScript Length:\t %d" % self.scriptLen)
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