blocktools/block.py at master · Demontf/blocktools · GitHub

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from blocktools import *


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\t\t %s" % str(self.time)
        print "Difficulty\t %8x" % self.bits
        print "Nonce\t\t %s" % self.nonce


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):
                # get tx hex
                startPos = blockchain.tell()
                tx = Tx(blockchain)
                endPos = blockchain.tell()
                blockchain.seek(startPos)
                tx_hex = txhex(blockchain, endPos - startPos)
                blockchain.seek(endPos)
                tx.txid = hex2hash(tx_hex)
                self.Txs.append(tx)
                return
        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
        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()


class Tx:
    def __init__(self, blockchain):
        self.version = uint4(blockchain)
        self.inCount = varint(blockchain)
        self.inputs = []
        self.txid = ""

        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 "=" * 10 + " New Transaction " + "=" * 10
        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

    # def toDb(self):


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 "Previous Hash:\t %s" % hashStr(self.prevhash)
        print "Tx Out Index:\t %8x" % self.txOutId
        print "Script Length:\t %d" % self.scriptLen
        print "Script Sig:\t %s" % hashStr(self.scriptSig)
        print "Sequence:\t %8x" % self.seqNo


class txOutput:
    def __init__(self, blockchain):
        self.value = uint8(blockchain)
        self.scriptLen = varint(blockchain)
        self.pubkey = blockchain.read(self.scriptLen)

    def toString(self):
        print "Value:\t\t %d" % self.value
        print "Script Len:\t %d" % self.scriptLen
        print "Pubkey:\t\t %s" % hashStr(self.pubkey)