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annotate src/block.py @ 2:5b16e6df6a59

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get txid hashing transaction data
author Dennis Concepcion Martin <dennisconcepcionmartin@gmail.com>
date Sun, 17 Oct 2021 11:14:46 +0200
parents 2327b9eda10f
children 3d83609e12a1
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1 import hashlib
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2 from src.helpers import read_bytes
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3 from src.helpers import get_variable_int
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6 class Block:
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7 """
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8 Block structure
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9 """
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11 block_hash = str()
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12 magic_number = int()
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13 size = int()
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14 number_of_transactions = int()
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15 transactions = []
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17 class Header:
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18 version = int()
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19 previous_block_hash = str()
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20 merkle_root = str()
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21 timestamp = int() # Epoch Unix time
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22 difficult_target = int() # Bits
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23 nonce = int()
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26 class Transaction:
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27 id = str()
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28 version = int()
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29 number_of_inputs = int()
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30 inputs = []
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32 class Inputs:
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33 pass
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36 def read_block(file):
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37 """
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38 Deserialize block
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39 More info about block structure: https://github.com/bitcoinbook/bitcoinbook/blob/develop/ch09.asciidoc
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40 :param file: <class '_io.BufferedReader'>, required
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41 :return:
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42 """
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43
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44 block = Block()
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45 block.magic_number = int.from_bytes(read_bytes(file, 4), 'big')
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46 block.size = int.from_bytes(read_bytes(file, 4), 'big')
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48 # Compute block hash
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49 header_bytes = read_bytes(file, 80, 'forward')
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50 block_hash = hashlib.sha256(header_bytes).digest()
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51 block_hash = hashlib.sha256(block_hash).digest()
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53 # Read block header
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54 header = block.Header()
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55 header.block_hash = block_hash[::-1].hex()
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56 header.version = int.from_bytes(header_bytes[:4], 'little')
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57 header.previous_block_hash = header_bytes[4:36][::-1].hex()
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58 header.merkle_root = header_bytes[36:68][::-1].hex()
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59 header.timestamp = int.from_bytes(header_bytes[68:72], 'little')
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60 header.difficult_target = int.from_bytes(header_bytes[72:76], 'little')
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61 header.nonce = int.from_bytes(header_bytes[76:80], 'little')
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63 # Number of transactions (varInt)
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64 block.number_of_transactions = get_variable_int(file)
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66 # Compute transaction ID
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67 # Get remaining bytes until the end of the block
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68 transaction = Transaction()
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69 bytes_read = file.tell()
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70 whole_block_size = block.size + 8 # Plus magic number and block size
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71 transaction_data_size = whole_block_size - bytes_read
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72 transaction_data = file.read(transaction_data_size)
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73 file.seek(bytes_read) # Set position to where 'transaction data' starts
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74 transaction_id = hashlib.sha256(transaction_data).digest()
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75 transaction_id = hashlib.sha256(transaction_id).digest()
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76 transaction.id = transaction_id[::-1].hex()
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77
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78 transaction.version = int.from_bytes(read_bytes(file, 4), 'little')
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79 transaction.number_of_inputs = get_variable_int(file)
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