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37 lines
1.4 KiB
Python
37 lines
1.4 KiB
Python
"""即使同步依赖项忽略其超时，绑定准备工作也会起作用。"""
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import asyncio
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import time
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class Readiness:
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def __init__(self, probe, *, timeout=3, cache_seconds=5):
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self.probe = probe
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self.timeout = timeout
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self.cache_seconds = cache_seconds
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self.lock = asyncio.Lock()
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self.running = None
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self.until = 0.0
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self.ok = False
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@staticmethod
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def consume(task):
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# 在同步探测结束之前，请求可能会超时或断开连接。检索晚期异常而不记录依赖项消息/秘密。
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if not task.cancelled():
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task.exception()
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async def check(self):
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async with self.lock:
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if time.monotonic() < self.until:
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return self.ok
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if self.running is None or self.running.done():
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self.running = asyncio.create_task(asyncio.to_thread(self.probe))
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self.running.add_done_callback(self.consume)
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try:
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# 取消 to_thread 等待不会停止其 OS 线程。保持任务处于活动状态，以便后续请求重用相同的探测器。
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await asyncio.wait_for(asyncio.shield(self.running), self.timeout)
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self.ok = True
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except Exception:
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self.ok = False
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self.until = time.monotonic() + self.cache_seconds
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return self.ok
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