Handle disconnected sockets in unbound collector. (#6561)

* Handle disconnected sockets in unbound collector.

This adds an explicit check for the case of a socket that's already
disconnected and skips logging an error message.  The conditionn
technically is an error, but it's one that we can recover from trivially
by just doing nothing in this case (we were trying to disconnect the
scoket anyway, so if it's already disconnected, we don't need to change
anything).

This uses Python's `errno` module so that we can detect this situation
in a system-agnostic manner.

Fixes #6434

1 files changed, 3 insertions, 1 deletions

diff --git a/collectors/python.d.plugin/python_modules/bases/FrameworkServices/SocketService.py b/collectors/python.d.plugin/python_modules/bases/FrameworkServices/SocketService.py
index 27519b76af..3b94fcdf2f 100644
--- a/collectors/python.d.plugin/python_modules/bases/FrameworkServices/SocketService.py
+++ b/collectors/python.d.plugin/python_modules/bases/FrameworkServices/SocketService.py
@@ -4,6 +4,7 @@
 # Author: Ilya Mashchenko (ilyam8)
 # SPDX-License-Identifier: GPL-3.0-or-later
 
+import errno
 import socket
 
 try:
@@ -181,7 +182,8 @@ class SocketService(SimpleService):
                 self._sock.shutdown(2)  # 0 - read, 1 - write, 2 - all
                 self._sock.close()
             except Exception as error:
-                self.error(error)
+                if not (hasattr(error, 'errno') and error.errno == errno.ENOTCONN):
+                    self.error(error)
             self._sock = None
 
     def _send(self, request=None):