101 lines
2.8 KiB
Python
101 lines
2.8 KiB
Python
from threading import Thread
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from queue import Queue
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from os import mkfifo, remove
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from os.path import exists, join
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from signal import signal, SIGTERM, SIGINT
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from secrets import token_urlsafe
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class PipeWriterThread(Thread):
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def __init__(self, to_write_queue, pipe_path):
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super().__init__()
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self._to_write_queue = to_write_queue
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self._pipe_path = pipe_path
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def run(self):
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while True:
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message = self._to_write_queue.get(block=True)
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if message is None:
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break
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with open(self._pipe_path, 'wb') as pipe:
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pipe.write(message)
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def stop(self):
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self._to_write_queue.put(None)
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self.join()
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class PipeReaderThread(Thread):
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_stop_sequence = b'stop_reading'
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def __init__(self, results_queue, pipe_path):
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super().__init__()
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self._results_queue = results_queue
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self._pipe_path = pipe_path
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def run(self):
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while True:
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with open(self._pipe_path, 'rb') as pipe:
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message = pipe.read()
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if message == self._stop_sequence:
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break
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self._results_queue.put(message, block=True)
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def stop(self):
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with open(self._pipe_path, 'wb') as pipe:
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pipe.write(self._stop_sequence)
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self.join()
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class PipeHandler:
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def __init__(self, pipe_path):
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self._pipe_path = pipe_path
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def recreate(self):
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self.remove()
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mkfifo(self._pipe_path)
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def remove(self):
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if exists(self._pipe_path):
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remove(self._pipe_path)
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class PipeIOServer:
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def __init__(self, in_pipe=None, out_pipe=None):
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self.in_pipe, self.out_pipe = in_pipe, out_pipe
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self._create_pipes()
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self._message_queue = Queue()
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self._io_threads = {
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'reader': PipeReaderThread(self._message_queue, self.in_pipe),
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'writer': PipeWriterThread(self._message_queue, self.out_pipe)
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}
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def _create_pipes(self):
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if not self.in_pipe or not self.out_pipe:
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pipe_id = token_urlsafe(6)
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self.in_pipe = join('/tmp', f'in_pipe_{pipe_id}')
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self.out_pipe = join('/tmp', f'out_pipe_{pipe_id}')
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PipeHandler(self.in_pipe).recreate()
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PipeHandler(self.out_pipe).recreate()
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def run(self):
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for thread in self._io_threads.values():
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thread.start()
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def stop(self):
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for thread in self._io_threads.values():
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thread.stop()
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PipeHandler(self.in_pipe).remove()
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PipeHandler(self.out_pipe).remove()
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if __name__ == "__main__":
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pipe_io = PipeIOServer()
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signal(SIGTERM, lambda a, b: pipe_io.stop())
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signal(SIGINT, lambda a, b: pipe_io.stop())
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pipe_io.run()
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print('Running pipe IO server with named pipes:')
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print(f'Input: {pipe_io.in_pipe}')
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print(f'Output: {pipe_io.out_pipe}')
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