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import time
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import traceback
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from threading import Thread, Lock
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class Listener:
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task_queue = []
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lock = Lock()
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thread = None
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@classmethod
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def _process_tasks(cls):
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while True:
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task = None
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with cls.lock:
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if cls.task_queue:
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task = cls.task_queue.pop(0)
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if task is None:
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time.sleep(0.001)
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continue
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func, args, kwargs = task
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try:
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func(*args, **kwargs)
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except Exception as e:
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tb = traceback.format_exc().split('\n')[:-1]
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print('\n'.join(tb))
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@classmethod
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def add_task(cls, func, *args, **kwargs):
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with cls.lock:
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cls.task_queue.append((func, args, kwargs))
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if cls.thread is None:
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cls.thread = Thread(target=cls._process_tasks, daemon=True)
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cls.thread.start()
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def async_run(func, *args, **kwargs):
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Listener.add_task(func, *args, **kwargs)
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class FIFOQueue:
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def __init__(self):
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self.queue = []
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self.lock = Lock()
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def push(self, cmd, data = None):
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with self.lock:
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self.queue.append( (cmd, data) )
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def pop(self):
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with self.lock:
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if self.queue:
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return self.queue.pop(0)
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return None
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def top(self):
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with self.lock:
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if self.queue:
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return self.queue[0]
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return None
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def next(self):
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while True:
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with self.lock:
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if self.queue:
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return self.queue.pop(0)
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time.sleep(0.001)
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class AsyncStream:
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def __init__(self):
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self.input_queue = FIFOQueue()
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self.output_queue = FIFOQueue()
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