Refactor pipe logic to a separate class

pipe_io_server/pipe_writer_thread.py

@@ -2,6 +2,7 @@ from threading import Thread
 from queue import Queue
 
 from .terminate_process_on_failure import terminate_process_on_failure
+from .pipe import Pipe
 
 
 class PipeWriterThread(Thread):
@@ -19,8 +20,7 @@ class PipeWriterThread(Thread):
             message = self._write_queue.get(block=True)
             if message is None:
                 break
-            with open(self._pipe_path, 'wb') as pipe:
-                pipe.write(message)
+            Pipe(self._pipe_path).write(message)
 
     def stop(self):
         self._write_queue.put(None)