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annotate src/puppy/block.py @ 9:e218f70e19e9

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refactor code
author Dennis Concepcion Martin <dennisconcepcionmartin@gmail.com>
date Sun, 24 Oct 2021 21:00:49 +0200
parents 4d259e84160d
children 6e9f420c117e
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1 from puppy.block_structure import *
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2 from puppy.helpers import get_var_int
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3 from puppy.helpers import compute_hash
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4
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5 """
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6 Deserialize methods
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7 """
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10 def deserialize_block(f):
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11 """
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12 Deserialize block
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13 :param f: buffer, required
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14 :return: dict
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15 """
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16
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17 block = Block()
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18 block.magic_number = f.read(4).hex()
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19 block.size = f.read(4)[::-1].hex()
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20 block_header, block.id = deserialize_header(f)
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21 block.transaction_count = get_var_int(f)
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22
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23 transactions = []
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24 for transaction_number in range(int(block.transaction_count, 16)):
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25 transactions.append(deserialize_transaction_data(f))
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26
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27 block_dict = block.__dict__
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28 block_dict['header'] = block_header
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29 block_dict['transactions'] = transactions
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30
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31 return block_dict
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32
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33
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34 def deserialize_header(f):
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35 """
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36 Deserialize block header
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37 More info: https://learnmeabitcoin.com/technical/block-header
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38 :param f: buffer, required
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39 :return: (dict, string)
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40 """
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41
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42 # Compute block hash
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43 before = f.tell()
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44 header = f.read(80)
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45 block_hash = compute_hash(header)
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46 f.seek(before)
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47
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48 header = Header()
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49 header.version = f.read(4)[::-1].hex()
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50 header.previous_block_id = f.read(32)[::-1].hex()
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51 header.merkle_root = f.read(32)[::-1].hex()
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52 header.time = f.read(4)[::-1].hex()
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53 header.bits = f.read(4)[::-1].hex()
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54 header.nonce = f.read(4)[::-1].hex()
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55
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56 return header.__dict__, block_hash
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57
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58
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59 def deserialize_transaction_data(f):
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60 """
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61 Deserialize transaction data
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62 More info: https://learnmeabitcoin.com/technical/transaction-data
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63 :param f: buffer, required
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64 :return: dict
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65 """
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66
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67 transaction = Transaction()
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68 start_transaction_data = f.tell()
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69 transaction.version = f.read(4)[::-1].hex()
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70 transaction.input_count = get_var_int(f)
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71
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72 transaction_inputs = []
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73 for input_number in range(int(transaction.input_count, 16)):
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74 transaction_input = TransactionInput()
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75 transaction_input.id = f.read(32)[::-1].hex()
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76 transaction_input.vout = f.read(4)[::-1].hex()
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77 transaction_input.script_sig_size = get_var_int(f)
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78 transaction_input.script_sig = f.read(int(transaction_input.script_sig_size, 16)).hex()
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79 transaction_input.sequence = f.read(4)[::-1].hex()
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80 transaction_inputs.append(transaction_input.__dict__)
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81
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82 transaction.output_count = get_var_int(f)
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83
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84 transaction_outputs = []
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85 for output_number in range(int(transaction.output_count, 16)):
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86 transaction_output = TransactionOutput()
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87 transaction_output.value = f.read(8)[::-1].hex()
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88 transaction_output.script_pub_key_size = get_var_int(f)
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89 transaction_output.script_pub_key = f.read(int(transaction_output.script_pub_key_size, 16)).hex()
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90 transaction_outputs.append(transaction_output.__dict__)
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91
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92 transaction.lock_time = f.read(4)[::-1].hex()
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93
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94 # Compute transaction id
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95 end_transaction_data = f.tell()
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96 transaction_data_size = end_transaction_data - start_transaction_data
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97 f.seek(start_transaction_data)
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98 transaction_data = f.read(transaction_data_size)
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99 f.seek(end_transaction_data)
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100 transaction.id = compute_hash(transaction_data)
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101
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102 transaction_dict = transaction.__dict__
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103 transaction_dict['inputs'] = transaction_inputs
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104 transaction_dict['outputs'] = transaction_outputs
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105
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106 return transaction_dict