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297 lines
8.9 KiB
297 lines
8.9 KiB
# -*- coding: utf-8 -*-
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#
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import asyncio
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import functools
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import inspect
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import os
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import threading
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import time
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from concurrent.futures import ThreadPoolExecutor
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from functools import wraps
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from django.db import transaction
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from .utils import logger
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from .db.utils import open_db_connection
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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 default_suffix_key(*args, **kwargs):
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return 'default'
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def key_by_org(*args, **kwargs):
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values = list(kwargs.values())
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if not values:
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return 'default'
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return values[0][0].org_id
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class EventLoopThread(threading.Thread):
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def __init__(self, *args, **kwargs):
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super().__init__(*args, **kwargs)
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self._loop = asyncio.new_event_loop()
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def run(self) -> None:
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asyncio.set_event_loop(self._loop)
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try:
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self._loop.run_forever()
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except Exception as e:
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logger.error("Event loop stopped with err: {} ".format(e))
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def get_loop(self):
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return self._loop
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_loop_thread = EventLoopThread()
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_loop_thread.daemon = True
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_loop_thread.start()
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executor = ThreadPoolExecutor(
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max_workers=10,
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thread_name_prefix='debouncer'
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)
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_loop_debouncer_func_task_cache = {}
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_loop_debouncer_func_args_cache = {}
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_loop_debouncer_func_task_time_cache = {}
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def get_loop():
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return _loop_thread.get_loop()
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def cancel_or_remove_debouncer_task(cache_key):
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task = _loop_debouncer_func_task_cache.get(cache_key, None)
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if not task:
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return
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if task.done():
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del _loop_debouncer_func_task_cache[cache_key]
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else:
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task.cancel()
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def run_debouncer_func(cache_key, org, ttl, func, *args, **kwargs):
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cancel_or_remove_debouncer_task(cache_key)
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run_func_partial = functools.partial(_run_func_with_org, cache_key, org, func)
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current = time.time()
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first_run_time = _loop_debouncer_func_task_time_cache.get(cache_key, None)
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if first_run_time is None:
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_loop_debouncer_func_task_time_cache[cache_key] = current
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first_run_time = current
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if current - first_run_time > ttl:
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_loop_debouncer_func_args_cache.pop(cache_key, None)
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_loop_debouncer_func_task_time_cache.pop(cache_key, None)
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executor.submit(run_func_partial, *args, **kwargs)
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logger.debug('pid {} executor submit run {}'.format(
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os.getpid(), func.__name__, ))
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return
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loop = _loop_thread.get_loop()
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_debouncer = Debouncer(run_func_partial, lambda: True, ttl, loop=loop, executor=executor)
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task = asyncio.run_coroutine_threadsafe(_debouncer(*args, **kwargs), loop=loop)
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_loop_debouncer_func_task_cache[cache_key] = task
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class Debouncer(object):
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def __init__(self, callback, check, delay, loop=None, executor=None):
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self.callback = callback
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self.check = check
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self.delay = delay
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self.loop = loop
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if not loop:
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self.loop = asyncio.get_event_loop()
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self.executor = executor
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async def __call__(self, *args, **kwargs):
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await asyncio.sleep(self.delay)
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ok = await self._run_sync_to_async(self.check)
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if ok:
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callback_func = functools.partial(self.callback, *args, **kwargs)
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return await self._run_sync_to_async(callback_func)
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async def _run_sync_to_async(self, func):
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if asyncio.iscoroutinefunction(func):
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return await func()
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return await self.loop.run_in_executor(self.executor, func)
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ignore_err_exceptions = (
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"(3101, 'Plugin instructed the server to rollback the current transaction.')",
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)
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def _run_func_with_org(key, org, func, *args, **kwargs):
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from orgs.utils import set_current_org
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try:
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with open_db_connection() as conn:
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# 保证执行时使用的是新的 connection 数据库连接
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# 避免出现 MySQL server has gone away 的情况
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set_current_org(org)
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func(*args, **kwargs)
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except Exception as e:
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msg = str(e)
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log_func = logger.error
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if msg in ignore_err_exceptions:
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log_func = logger.info
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pid = os.getpid()
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thread_name = threading.current_thread()
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log_func('pid {} thread {} delay run {} error: {}'.format(
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pid, thread_name, func.__name__, msg))
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_loop_debouncer_func_task_cache.pop(key, None)
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_loop_debouncer_func_args_cache.pop(key, None)
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_loop_debouncer_func_task_time_cache.pop(key, None)
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def delay_run(ttl=5, key=None):
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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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:param key: 是否合并参数, 一个 callback
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:return:
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"""
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def inner(func):
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suffix_key_func = key if key else default_suffix_key
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sigs = inspect.signature(func)
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if len(sigs.parameters) != 0:
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raise ValueError('Merge delay run must not arguments: %s' % func.__name__)
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@functools.wraps(func)
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def wrapper(*args, **kwargs):
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from orgs.utils import get_current_org
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org = get_current_org()
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func_name = f'{func.__module__}_{func.__name__}'
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key_suffix = suffix_key_func(*args)
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cache_key = f'DELAY_RUN_{func_name}_{key_suffix}'
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run_debouncer_func(cache_key, org, ttl, func, *args, **kwargs)
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return wrapper
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return inner
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def merge_delay_run(ttl=5, key=None):
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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, 并且合并参数
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:param ttl:
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:param key: 是否合并参数, 一个 callback
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:return:
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"""
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def delay(func, *args, **kwargs):
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from orgs.utils import get_current_org
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# 每次调用 delay 时可以指定本次调用的 ttl
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current_ttl = kwargs.pop('ttl', ttl)
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suffix_key_func = key if key else default_suffix_key
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org = get_current_org()
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func_name = f'{func.__module__}_{func.__name__}'
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key_suffix = suffix_key_func(*args, **kwargs)
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cache_key = f'MERGE_DELAY_RUN_{func_name}_{key_suffix}'
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cache_kwargs = _loop_debouncer_func_args_cache.get(cache_key, {})
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for k, v in kwargs.items():
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if not isinstance(v, (tuple, list, set)):
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raise ValueError('func kwargs value must be list or tuple: %s %s' % (func.__name__, v))
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v = set(v)
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if k not in cache_kwargs:
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cache_kwargs[k] = v
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else:
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cache_kwargs[k] = cache_kwargs[k].union(v)
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_loop_debouncer_func_args_cache[cache_key] = cache_kwargs
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run_debouncer_func(cache_key, org, current_ttl, func, *args, **cache_kwargs)
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def apply(func, sync=False, *args, **kwargs):
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if sync:
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return func(*args, **kwargs)
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else:
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return delay(func, *args, **kwargs)
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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 isinstance(param.default, tuple):
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raise ValueError('func default must be tuple: %s' % param.default)
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func.delay = functools.partial(delay, func)
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func.apply = functools.partial(apply, func)
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@functools.wraps(func)
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def wrapper(*args, **kwargs):
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return func(*args, **kwargs)
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return wrapper
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return inner
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@delay_run(ttl=5)
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def test_delay_run():
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print("Hello, now is %s" % time.time())
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@merge_delay_run(ttl=5, key=lambda users=(): users[0][0])
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def test_merge_delay_run(users=()):
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name = ','.join(users)
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time.sleep(2)
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print("Hello, %s, now is %s" % (name, time.time()))
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def do_test():
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s = time.time()
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print("start : %s" % time.time())
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for i in range(100):
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# test_delay_run('test', year=i)
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test_merge_delay_run(users=['test %s' % i])
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test_merge_delay_run(users=['best %s' % i])
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test_delay_run('test run %s' % i)
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end = time.time()
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using = end - s
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print("end : %s, using: %s" % (end, using))
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def cached_method(ttl=20):
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_cache = {}
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def decorator(func):
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@wraps(func)
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def wrapper(*args, **kwargs):
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key = (func, args, tuple(sorted(kwargs.items())))
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# 检查缓存是否存在且未过期
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if key in _cache and time.time() - _cache[key]['timestamp'] < ttl:
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return _cache[key]['result']
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# 缓存过期或不存在，执行方法并缓存结果
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result = func(*args, **kwargs)
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_cache[key] = {'result': result, 'timestamp': time.time()}
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return result
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return wrapper
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return decorator
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