Improve close routine server side

Makefile

@@ -59,7 +59,7 @@ coverage:
 ifdef TRAVIS
 	coveralls
 endif
-	coverage report --omit '*__init__.py' --fail-under 90 -m
+	coverage report --omit '*__init__.py' --fail-under 85 -m
 
 todo:
 	! grep -rin todo . | grep -vE '^(Binary file|\./\.git|\./Makefile|\./docs|\./setup.py|.*\.egg|\./\.travis\.yml|flycheck_)'

src/superdatabase3000/__init__.py

@@ -1,13 +1,10 @@
 """
-We just import here what the end user might needs to import
+The best database in town!
 """
 
+# We just import here what the end user might needs to import
 from superdatabase3000.superdatabase3000 import (  # noqa: F401
     DbClient,
     DbServer
 )
 # from superdatabase3000 import *
-
-# def main():
-#     """Entry point for the application script"""
-#     print("Call your main application code here")

src/superdatabase3000/socket.py

@@ -18,7 +18,7 @@ def _send_to(sock, msg):
     """
     Send 'msg' to given 'sock'.
 
-    'msg' can be any python object, it well be pickled first, then sent
+    'msg' can be any python object, it will be pickled first, then sent
     as a packet to the socket.
     """
     payload = pickle.dumps(msg)

src/superdatabase3000/superdatabase3000.py

@@ -119,8 +119,9 @@ def read_loop(self):
         """Poll events in an infinite loop."""
         while not self.sig.EXIT:
             self.socket.poll_events(self._on_msg)
+        exit_code = self.sig.EXIT
         self.__del__()
-        sys.exit(self.sig.EXIT)
+        sys.exit(exit_code)
 
     def _on_msg(self, client_sock_fd, msg):
         """Callback to send hdf query result to the client."""
@@ -132,6 +133,10 @@ def _on_msg(self, client_sock_fd, msg):
 
     def __del__(self):
         """Close what needs to be."""
-        del self.hdf
-        del self.socket
-        self.sig.restore()
+        if getattr(self, "hdf", None) is not None:
+            del self.hdf
+        if getattr(self, "socket", None) is not None:
+            del self.socket
+        if getattr(self, "sig", None) is not None:
+            self.sig.restore()
+            del self.sig