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135 lines
3.1 KiB
135 lines
3.1 KiB
# -*- coding: utf-8 -*-
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#
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import functools
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import inspect
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import time
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import uuid
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from concurrent.futures import ThreadPoolExecutor
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from django.core.cache import cache
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from django.db import transaction
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def on_transaction_commit(func):
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"""
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如果不调用on_commit, 对象创建时添加多对多字段值失败
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"""
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def inner(*args, **kwargs):
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transaction.on_commit(lambda: func(*args, **kwargs))
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return inner
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class Singleton(object):
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""" 单例类 """
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def __init__(self, cls):
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self._cls = cls
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self._instance = {}
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def __call__(self):
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if self._cls not in self._instance:
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self._instance[self._cls] = self._cls()
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return self._instance[self._cls]
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def _run_func_if_is_last(ttl, func, *args, **kwargs):
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ix = uuid.uuid4().__str__()
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key = f'DELAY_RUN_{func.__name__}'
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cache.set(key, ix, ttl)
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st = (ttl - 2 > 1) and ttl - 2 or 2
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time.sleep(st)
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got = cache.get(key, None)
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if ix == got:
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func(*args, **kwargs)
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executor = ThreadPoolExecutor(10)
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def delay_run(ttl=5):
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def inner(func):
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@functools.wraps(func)
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def wrapper(*args, **kwargs):
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executor.submit(_run_func_if_is_last, ttl, func, *args, **kwargs)
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return wrapper
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return inner
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def _merge_run(ttl, func, *args, **kwargs):
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if not args or not isinstance(args[0], (list, tuple)):
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raise ValueError('args[0] must be list or tuple')
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key = f'DELAY_MERGE_RUN_{func.__name__}'
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ix = uuid.uuid4().__str__()
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value = cache.get(key, [])
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value.extend(args[0])
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st = (ttl - 2 > 1) and ttl - 2 or 2
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time.sleep(st)
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got = cache.get(key, None)
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if ix == got:
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func(*args, **kwargs)
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def merge_delay_run(ttl):
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"""
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合并 func 参数，延迟执行, 在 ttl 秒内, 只执行最后一次
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func 参数必须是 *args
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:param ttl:
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:return:
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"""
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def inner(func):
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sigs = inspect.signature(func)
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if len(sigs.parameters) != 1:
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raise ValueError('func must have one arguments: %s' % func.__name__)
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param = list(sigs.parameters.values())[0]
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if not str(param).startswith('*'):
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raise ValueError('func args must be startswith *: %s' % func.__name__)
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@functools.wraps(func)
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def wrapper(*args):
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key = f'DELAY_MERGE_RUN_{func.__name__}'
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values = cache.get(key, [])
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new_arg = [*values, *args]
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cache.set(key, new_arg, ttl)
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return delay_run(ttl)(func)(*new_arg)
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return wrapper
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return inner
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def delay_run(ttl=5):
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"""
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延迟执行函数, 在 ttl 秒内, 只执行最后一次
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:param ttl:
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:return:
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"""
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def inner(func):
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@functools.wraps(func)
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def wrapper(*args, **kwargs):
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executor.submit(_run_func_if_is_last, ttl, func, *args, **kwargs)
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return wrapper
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return inner
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@delay_run(ttl=10)
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def test_delay_run(username, year=2000):
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print("Hello, %s, now is %s" % (username, year))
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@merge_delay_run(ttl=10)
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def test_merge_delay_run(*users):
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name = ','.join(users)
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print("Hello, %s, now is %s" % (name, time.time()))
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