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annotate src/block.py @ 3:3d83609e12a1

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get value in output
author Dennis Concepcion Martin <dennisconcepcionmartin@gmail.com>
date Sun, 17 Oct 2021 17:33:26 +0200
parents 5b16e6df6a59
children e7a84094bf07
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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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10
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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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25
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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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31 number_of_outputs = int()
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32 outputs = []
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33
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34 class TransactionInput:
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35 id = str()
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36 is_coinbase = False
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37 vout = int()
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38 script_sig_size = int()
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39 script_sig = str()
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40 sequence = int()
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41
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42 class TransactionOutput:
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43 value = float()
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44 script_pub_key_size = int()
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45 script_pub_key = str()
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47
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48 def read_block(file):
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49 """
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50 Deserialize block
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51 More info about block structure: https://github.com/bitcoinbook/bitcoinbook/blob/develop/ch09.asciidoc
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52 :param file: <class '_io.BufferedReader'>, required
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53 :return:
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54 """
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55
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56 block = Block()
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57 block.magic_number = int.from_bytes(read_bytes(file, 4), 'big')
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58 block.size = int.from_bytes(read_bytes(file, 4), 'big')
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60 # Compute block hash
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61 header_bytes = read_bytes(file, 80, 'forward')
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62 block_hash = hashlib.sha256(header_bytes).digest()
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63 block_hash = hashlib.sha256(block_hash).digest()
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64
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65 # Read block header
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66 header = block.Header()
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67 header.block_hash = block_hash[::-1].hex()
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68 header.version = int.from_bytes(header_bytes[:4], 'little')
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69 header.previous_block_hash = header_bytes[4:36][::-1].hex()
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70 header.merkle_root = header_bytes[36:68][::-1].hex()
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71 header.timestamp = int.from_bytes(header_bytes[68:72], 'little')
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72 header.difficult_target = int.from_bytes(header_bytes[72:76], 'little')
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73 header.nonce = int.from_bytes(header_bytes[76:80], 'little')
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74
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75 # Number of transactions (varInt)
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76 block.number_of_transactions = get_variable_int(file)
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78 for transaction_number in range(block.number_of_transactions):
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79 transaction = Transaction()
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80 transaction.version = int.from_bytes(read_bytes(file, 4), 'big')
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81 transaction.number_of_inputs = get_variable_int(file)
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82
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83 for input_number in range(transaction.number_of_inputs):
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84 transaction_input = transaction.TransactionInput()
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85 transaction_input.id = read_bytes(file, 32).hex()
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86 if transaction_input.id == '0000000000000000000000000000000000000000000000000000000000000000':
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87 transaction_input.is_coinbase = True
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88
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89 transaction_input.vout = int.from_bytes(read_bytes(file, 4), 'little')
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90 transaction_input.script_sig_size = get_variable_int(file)
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91 transaction_input.script_sig = read_bytes(file, transaction_input.script_sig_size, 'forward').hex()
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92 transaction_input.sequence = int.from_bytes(read_bytes(file, 4), 'little')
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93
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94 transaction.number_of_outputs = get_variable_int(file)
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96 for output_number in range(transaction.number_of_outputs):
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97 transaction_output = transaction.TransactionOutput()
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98 transaction_output.value = float.fromhex(read_bytes(file, 8).hex())
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99 transaction_output.value /= 100000000 # Satoshis to BTC