|
| 1 | +import asyncio |
| 2 | +import hashlib |
| 3 | +import json |
| 4 | +import logging |
| 5 | +import zlib |
| 6 | + |
| 7 | +import aio_pika |
| 8 | +from Cryptodome.Cipher import AES |
| 9 | +from Cryptodome.Util import Padding |
| 10 | +from aio_pika.abc import AbstractRobustConnection, AbstractRobustChannel, AbstractExchange, AbstractRobustQueue |
| 11 | + |
| 12 | +from .interface import AsyncRunnable |
| 13 | + |
| 14 | +log = logging.getLogger(__name__) |
| 15 | + |
| 16 | + |
| 17 | +class RabbitMQ: |
| 18 | + """rabbitmq configurate/init/connect/encrypt/decrypt/encode/decode""" |
| 19 | + |
| 20 | + _connection: AbstractRobustConnection = None |
| 21 | + _channel: AbstractRobustChannel = None |
| 22 | + _queue: AbstractRobustQueue = None |
| 23 | + _exchange: AbstractExchange = None |
| 24 | + |
| 25 | + def __init__(self, host: str, port: int, queue: str, qos: int, heartbeat: int, login: str = '', password: str = '', |
| 26 | + key: str = '', key_digits: int = 16, is_producer: bool = False): |
| 27 | + self._host = host |
| 28 | + self._port = port |
| 29 | + self.queue = queue |
| 30 | + self.qos = qos |
| 31 | + self._heartbeat = heartbeat |
| 32 | + self._login = login |
| 33 | + self._password = password |
| 34 | + self._key = key |
| 35 | + self._key_digits = key_digits |
| 36 | + self.is_producer = is_producer |
| 37 | + |
| 38 | + # check aes is 128, 192 or 256 |
| 39 | + if key_digits not in AES.key_size: |
| 40 | + raise ValueError(f'rabbitmq key_digits: {key_digits} not in {AES.key_size}') |
| 41 | + if key != '': |
| 42 | + key_encoded = key.encode('utf-8').ljust(key_digits, b'\x00') |
| 43 | + else: |
| 44 | + # if rabbitmq_key is not defined, use sha256 to generate one |
| 45 | + key_encoded = hashlib.sha256(f'{login}:{password}'.encode('utf-8')).digest() |
| 46 | + |
| 47 | + # make sure key digits is right |
| 48 | + self._aes_key = key_encoded[:key_digits] |
| 49 | + |
| 50 | + def decrypt(self, data: bytes) -> bytes: |
| 51 | + """ decrypt data |
| 52 | +
|
| 53 | + :param data: encrypted byte array |
| 54 | + :return: decrypted byte array |
| 55 | + """ |
| 56 | + decipher = AES.new(self._aes_key, AES.MODE_CBC, iv=data[:16]) |
| 57 | + data = decipher.decrypt(data[16:]) |
| 58 | + data = Padding.unpad(data, 16) |
| 59 | + return data |
| 60 | + |
| 61 | + def encrypt(self, data: bytes) -> bytes: |
| 62 | + """ encrypt data |
| 63 | +
|
| 64 | + :param data: byte array |
| 65 | + :return: encrypted byte array |
| 66 | + """ |
| 67 | + data = Padding.pad(data, 16) |
| 68 | + cipher = AES.new(self._aes_key, AES.MODE_CBC) |
| 69 | + data = cipher.encrypt(data) |
| 70 | + return cipher.iv + data |
| 71 | + |
| 72 | + def decode(self, data: bytes, compress: bool) -> dict: |
| 73 | + """decode raw rabbitmq data into plaintext data""" |
| 74 | + data = self.decrypt(data) |
| 75 | + if compress: |
| 76 | + data = zlib.decompress(data) |
| 77 | + return json.loads(str(data, encoding='utf-8')) |
| 78 | + |
| 79 | + def encode(self, data: dict, compress: bool) -> bytes: |
| 80 | + """encode pkg into rabbitmq data""" |
| 81 | + data = json.dumps(data).encode(encoding='utf-8') |
| 82 | + if compress: |
| 83 | + data = zlib.compress(data) |
| 84 | + data = self.encrypt(data) |
| 85 | + return data |
| 86 | + |
| 87 | + async def get_connection(self) -> AbstractRobustConnection: |
| 88 | + """get rabbitmq connection""" |
| 89 | + if self._connection is None: |
| 90 | + self._connection = await aio_pika.connect_robust( |
| 91 | + host=self._host, |
| 92 | + port=self._port, |
| 93 | + login=self._login, |
| 94 | + password=self._password, |
| 95 | + heartbeat=self._heartbeat |
| 96 | + ) |
| 97 | + await self._connection.connect() |
| 98 | + return self._connection |
| 99 | + |
| 100 | + async def get_channel(self) -> AbstractRobustChannel: |
| 101 | + """get rabbitmq channel""" |
| 102 | + if self._channel is None: |
| 103 | + connection = await self.get_connection() |
| 104 | + self._channel = await connection.channel() |
| 105 | + return self._channel |
| 106 | + |
| 107 | + async def get_queue(self) -> AbstractRobustQueue: |
| 108 | + """get rabbitmq queue""" |
| 109 | + if self._queue is None: |
| 110 | + channel = await self.get_channel() |
| 111 | + self._queue = await channel.declare_queue(self.queue) |
| 112 | + return self._queue |
| 113 | + |
| 114 | + async def get_exchange(self) -> AbstractExchange: |
| 115 | + """get rabbitmq default exchange""" |
| 116 | + if self._exchange is None: |
| 117 | + channel = await self.get_channel() |
| 118 | + self._exchange = channel.default_exchange |
| 119 | + return self._exchange |
| 120 | + |
| 121 | + |
| 122 | +class RabbitMQProducer(AsyncRunnable): |
| 123 | + """produce data to rabbitmq""" |
| 124 | + |
| 125 | + _exchange: AbstractExchange |
| 126 | + _connection: AbstractRobustConnection |
| 127 | + |
| 128 | + def __init__(self, rabbitmq: RabbitMQ, compress: bool): |
| 129 | + super().__init__() |
| 130 | + self._rabbitmq = rabbitmq |
| 131 | + self._compress = compress |
| 132 | + |
| 133 | + async def start(self): |
| 134 | + self._exchange = await self._rabbitmq.get_exchange() |
| 135 | + while True: |
| 136 | + await asyncio.sleep(3600) # sleep forever |
| 137 | + |
| 138 | + async def publish(self, data: dict): |
| 139 | + """produce data""" |
| 140 | + await self._exchange.publish(aio_pika.Message(body=self._rabbitmq.encode(data, self._compress)), |
| 141 | + routing_key=self._rabbitmq.queue) |
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