Refactor example server to separate file

echo_server.py

@@ -0,0 +1,18 @@
+from signal import signal, SIGTERM, SIGINT
+
+from pipe_io_server import PipeIOServer
+
+
+class EchoPipeIOServer(PipeIOServer):
+    def _handle_message(self, message):
+        self.send(message)
+
+
+if __name__ == "__main__":
+    pipe_io = EchoPipeIOServer()
+    signal(SIGTERM, lambda a, b: pipe_io.stop())
+    signal(SIGINT, lambda a, b: pipe_io.stop())
+    pipe_io.run()
+    print('Running pipe IO server with named pipes:')
+    print(f'Input:  {pipe_io.in_pipe}')
+    print(f'Output: {pipe_io.out_pipe}')

pipe_io_server.py

@@ -2,7 +2,6 @@ from threading import Thread
 from queue import Queue
 from os import mkfifo, remove
 from os.path import exists, join
-from signal import signal, SIGTERM, SIGINT
 from secrets import token_urlsafe
 from collections import namedtuple
 from abc import ABC, abstractmethod
@@ -101,18 +100,3 @@ class PipeIOServer(ABC):
         for thread in self._io_threads:
             thread.stop()
         PipeHandler(self.in_pipe, self.out_pipe).remove()
-
-
-class EchoPipeIOServer(PipeIOServer):
-    def _handle_message(self, message):
-        self.send(message)
-
-
-if __name__ == "__main__":
-    pipe_io = EchoPipeIOServer()
-    signal(SIGTERM, lambda a, b: pipe_io.stop())
-    signal(SIGINT, lambda a, b: pipe_io.stop())
-    pipe_io.run()
-    print('Running pipe IO server with named pipes:')
-    print(f'Input:  {pipe_io.in_pipe}')
-    print(f'Output: {pipe_io.out_pipe}')