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annotate src/bitcaviar_plus/block.py @ 19:905b6fdc5e1b

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handle invalid magic bytes
author Dennis Concepcion Martin <dennisconcepcionmartin@gmail.com>
date Wed, 10 Nov 2021 11:37:44 +0100
parents 6a0a8cce058e
children 32061555853c
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1 from bitcaviar_plus.block_structure import *
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2 from bitcaviar_plus.helpers import __get_var_int
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3 from bitcaviar_plus.helpers import __compute_hash
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4 from bitcaviar_plus.errors import InvalidMagicBytes
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6 """
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7 Deserialize methods
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8 """
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11 def deserialize_block(f):
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12 """
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13 Deserialize block
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14 :param f: buffer, required
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15 :return: dict
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16 """
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17
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18 block = Block()
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19 block.magic_number = f.read(4).hex()
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21 if block.magic_number != 'f9beb4d9':
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22 raise InvalidMagicBytes(block.magic_number)
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24 block.size = f.read(4)[::-1].hex()
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25 block_header, block.id = __deserialize_header(f)
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26 block.transaction_count = __get_var_int(f)
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28 transactions = []
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29 for transaction_number in range(int(block.transaction_count, 16)):
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30 transactions.append(__deserialize_transaction_data(f))
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32 block_dict = block.__dict__
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33 block_dict['header'] = block_header
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34 block_dict['transactions'] = transactions
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35
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36 return block_dict
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38
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39 def __deserialize_header(f):
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40 """
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41 Deserialize block header
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42 More info: https://learnmeabitcoin.com/technical/block-header
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43 :param f: buffer, required
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44 :return: (dict, string)
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45 """
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46
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47 # Compute block hash
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48 before = f.tell()
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49 header = f.read(80)
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50 block_hash = __compute_hash(header)
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51 f.seek(before)
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52
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53 header = Header()
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54 header.version = f.read(4)[::-1].hex()
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55 header.previous_block_id = f.read(32)[::-1].hex()
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56 header.merkle_root = f.read(32)[::-1].hex()
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57 header.time = f.read(4)[::-1].hex()
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58 header.bits = f.read(4)[::-1].hex()
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59 header.nonce = f.read(4)[::-1].hex()
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60
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61 return header.__dict__, block_hash
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63
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64 def __deserialize_transaction_data(f):
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65 """
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66 Deserialize transaction data
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67 More info: https://learnmeabitcoin.com/technical/transaction-data
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68 :param f: buffer, required
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69 :return: dict
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70 """
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71
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72 transaction = Transaction()
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73 start_transaction_data = f.tell()
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74 transaction.version = f.read(4)[::-1].hex()
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75 transaction.input_count = __get_var_int(f)
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77 transaction_inputs = []
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78 for input_number in range(int(transaction.input_count, 16)):
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79 transaction_input = TransactionInput()
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80 transaction_input.id = f.read(32)[::-1].hex()
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81 transaction_input.vout = f.read(4)[::-1].hex()
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82 transaction_input.script_sig_size = __get_var_int(f)
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83 transaction_input.script_sig = f.read(int(transaction_input.script_sig_size, 16)).hex()
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84 transaction_input.sequence = f.read(4)[::-1].hex()
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85 transaction_inputs.append(transaction_input.__dict__)
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86
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87 transaction.output_count = __get_var_int(f)
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88
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89 transaction_outputs = []
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90 for output_number in range(int(transaction.output_count, 16)):
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91 transaction_output = TransactionOutput()
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92 transaction_output.value = f.read(8)[::-1].hex()
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93 transaction_output.script_pub_key_size = __get_var_int(f)
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94 transaction_output.script_pub_key = f.read(int(transaction_output.script_pub_key_size, 16)).hex()
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95 transaction_outputs.append(transaction_output.__dict__)
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96
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97 transaction.lock_time = f.read(4)[::-1].hex()
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98
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99 # Compute transaction id
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100 end_transaction_data = f.tell()
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101 transaction_data_size = end_transaction_data - start_transaction_data
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102 f.seek(start_transaction_data)
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103 transaction_data = f.read(transaction_data_size)
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104 f.seek(end_transaction_data)
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105 transaction.id = __compute_hash(transaction_data)
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106
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107 transaction_dict = transaction.__dict__
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108 transaction_dict['inputs'] = transaction_inputs
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109 transaction_dict['outputs'] = transaction_outputs
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110
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111 return transaction_dict