74 lines
2.2 KiB
Python
74 lines
2.2 KiB
Python
from abc import ABC, abstractmethod
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from threading import Thread, Event
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from typing import Callable
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from .pipe_reader_thread import PipeReaderThread
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from .pipe_writer_thread import PipeWriterThread
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from .pipe import Pipe
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from .terminate_process_on_failure import terminate_process_on_failure
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class PipeIOServer(ABC, Thread):
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def __init__(self, in_pipe=None, out_pipe=None, permissions=0o600):
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super().__init__(daemon=True)
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self._in_pipe, self._out_pipe = in_pipe, out_pipe
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self._create_pipes(permissions)
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self._stop_event = Event()
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self._reader_thread, self._writer_thread = self._create_io_threads()
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self._io_threads = (self._reader_thread, self._writer_thread)
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self._on_stop = lambda: None
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def _create_pipes(self, permissions):
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Pipe(self.in_pipe).recreate(permissions)
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Pipe(self.out_pipe).recreate(permissions)
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@property
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def in_pipe(self):
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return self._in_pipe
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@property
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def out_pipe(self):
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return self._out_pipe
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def _create_io_threads(self):
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reader_thread = PipeReaderThread(self.in_pipe, self._stop_event, self.handle_message)
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writer_thread = PipeWriterThread(self.out_pipe, self._stop_event)
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return reader_thread, writer_thread
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@abstractmethod
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def handle_message(self, message):
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raise NotImplementedError()
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def send_message(self, message):
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self._writer_thread.write(message)
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@terminate_process_on_failure
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def run(self):
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for thread in self._io_threads:
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thread.start()
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self._stop_event.wait()
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self._stop()
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def stop(self):
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self._stop_event.set()
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if self.is_alive():
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self.join()
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def _stop(self):
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for thread in self._io_threads:
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if thread.is_alive():
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thread.stop()
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Pipe(self.in_pipe).remove()
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Pipe(self.out_pipe).remove()
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self._on_stop()
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def _set_on_stop(self, value):
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if not isinstance(value, Callable):
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raise ValueError("Supplied object is not callable!")
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self._on_stop = value
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on_stop = property(fset=_set_on_stop)
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def wait(self):
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self._stop_event.wait()
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