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annotate src/puppy/block.py @ 6:5f6d1a28051a

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add python package config files
author Dennis Concepcion Martin <dennisconcepcionmartin@gmail.com>
date Sun, 24 Oct 2021 15:18:54 +0200
parents src/block.py@1a8d94b500d8
children
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1 from puppy.helpers import __get_hash
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2 from puppy.helpers import __get_variable_int
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3 from puppy.block_structure import *
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6 def read_block(f):
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7 """
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8 Deserialize block
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9 More info about block structure: https://github.com/bitcoinbook/bitcoinbook/blob/develop/ch09.asciidoc
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10 More info about bytes order: https://en.wikipedia.org/wiki/Endianness
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11 :param f: buffer, required
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12 :return:
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13 """
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14
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15 block = Block()
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16 _ = f.read(4) # Magic number
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17 _ = f.read(4)[::-1] # Block size
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18 position_before_header = f.tell()
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19 header_bytes = f.read(80)
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20 block.block_hash = __get_hash(header_bytes)
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21 f.seek(position_before_header)
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22 block.header = __get_header(f)
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23 number_of_transactions = __get_variable_int(f)
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24
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25 transactions = []
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26 for transaction_number in range(number_of_transactions):
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27 transactions.append(__get_transaction(f))
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28
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29 block_dict = block.__dict__
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30 block_dict['transactions'] = transactions
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31
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32 return block_dict
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33
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34
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35 def __get_header(f):
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36 """
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37 Get block header
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38 :param f: buffer, required
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39 :return: dict
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40 """
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41
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42 header = Header()
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43 header.version = int.from_bytes(f.read(4), 'little')
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44 header.previous_block_hash = f.read(32)[::-1].hex()
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45 header.merkle_root = f.read(32)[::-1].hex()
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46 header.timestamp = int.from_bytes(f.read(4), 'little')
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47 header.bits = int.from_bytes(f.read(4), 'little')
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48 header.nonce = int.from_bytes(f.read(4), 'little')
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49
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50 return header.__dict__
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52
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53 def __get_transaction(f):
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54 """
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55 Get transaction
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56 :param f: buffer, required
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57 :return: dict
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58 """
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59
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60 transaction_data_start = f.tell()
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61
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62 transaction = Transaction()
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63 transaction.version = int.from_bytes(f.read(4)[::-1], 'big')
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64 number_of_inputs = __get_variable_int(f)
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65
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66 inputs = []
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67 for input_number in range(number_of_inputs):
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68 inputs.append(__get_input(f))
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69
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70 number_of_outputs = __get_variable_int(f)
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71
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72 outputs = []
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73 for output_number in range(number_of_outputs):
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74 outputs.append(__get_outputs(f))
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75
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76 transaction.lock_time = int.from_bytes(f.read(4)[::-1], 'little')
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77
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78 transaction_dict = transaction.__dict__
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79 transaction_dict['inputs'] = inputs
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80 transaction_dict['outputs'] = outputs
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81
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82 transaction_data_end = f.tell()
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83
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84 # Get current transaction ID: https://learnmeabitcoin.com/technical/txid
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85 transaction_data_size = transaction_data_end - transaction_data_start
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86 f.seek(transaction_data_start)
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87 transaction_data = f.read(transaction_data_size)
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88 transaction.id = __get_hash(transaction_data)
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89
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90 return transaction_dict
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91
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92
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93 def __get_input(buffer):
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94 """
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95 Get input from transaction data
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96 :param buffer: bytes, required
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97 :return: dict
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98 """
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99
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100 transaction_input = TransactionInput()
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101 transaction_input.id = buffer.read(32)[::-1].hex()
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102
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103 if transaction_input.id == '0000000000000000000000000000000000000000000000000000000000000000':
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104 transaction_input.is_coinbase = True
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105
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106 transaction_input.vout = int.from_bytes(buffer.read(4)[::-1], 'little')
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107 script_sig_size = __get_variable_int(buffer)
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108 transaction_input.script_sig = buffer.read(script_sig_size).hex()
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109 transaction_input.sequence = int.from_bytes(buffer.read(4)[::-1], 'little')
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110
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111 return transaction_input.__dict__
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112
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113
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114 def __get_outputs(buffer):
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115 """
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116 Get output from transaction data
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117 :param buffer: bytes, required
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118 :return: dict
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119 """
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120
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121 transaction_output = TransactionOutput()
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122 transaction_output.value = float.fromhex(buffer.read(8)[::-1].hex())
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123 transaction_output.value /= 100000000 # Satoshis to BTC
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124 script_pub_key_size = __get_variable_int(buffer)
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125 transaction_output.script_pub_key = buffer.read(script_pub_key_size).hex()
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126
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127 return transaction_output.__dict__