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annotate asyncio_threads/bucket_questions/single_thread_async.py @ 93:be91a73d801a

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[MrJuneJune] Updated my website.
author June Park <parkjune1995@gmail.com>
date Fri, 02 Jan 2026 18:02:22 -0800
parents 46daba6e3cf4
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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46daba6e3cf4 Few python scrtips to show how to use asychio.
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1 import asyncio
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2 from typing import Dict
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3
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4 class DistributedCache:
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5
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6 def __init__(self):
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7 self._user_bucket_map: Dict[str, TokenBucket] = {}
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9
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10 def get_bucket(self, user_id: str):
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11 return self._user_bucket_map[user_id]
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12
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13 def set_bucket(self, user_id: str):
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14 self._user_bucket_map[user_id] = TokenBucket()
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16
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17 INITIAL_VALUES = 10
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18
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19 class TokenBucket:
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20
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21 def __init__(self, initial_values = INITIAL_VALUES):
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22 self._tokens = initial_values
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23 self._refill_values = initial_values
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24 self._lock = asyncio.Lock()
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25
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26 def get_tokens(self):
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27 print(self._tokens)
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28 return self._tokens
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29
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30 async def consume_tokens(self, token: int):
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31 async with self._lock:
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32 if self.get_tokens() < token:
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33 return False
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34
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35 await asyncio.sleep(1)
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36 self._tokens -= token
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37 return True
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38
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39 async def refill_tokens(self):
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40 async with self._lock:
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41 self._tokens = self._refill_values
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42
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43
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44 cache = DistributedCache()
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45
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46 user_1 = "JUNE"
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47 user_2 = "VICTOR"
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48 cache.set_bucket(user_1)
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49 cache.set_bucket(user_2)
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50
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51 async def refill_token_bucket(user_id: str):
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52 await cache.get_bucket(user_id).refill_tokens()
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53
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54 async def use_tokens(user_id: str, tokens: int):
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55 return await cache.get_bucket(user_id).consume_tokens(tokens)
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56
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57 async def run():
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58 return_value = await asyncio.gather(
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59 use_tokens(user_1, 10),
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60 refill_token_bucket(user_1),
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61 use_tokens(user_1, 10),
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62 use_tokens(user_2, 10),
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63 )
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64 print(return_value)
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65
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66 if __name__ == "__main__":
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67 asyncio.run(run())