add null detector (useful for testing and potentially later on

supporting ip updates without a dedicated dedection mechanism)

dyndnsc/detector/null.py

@@ -0,0 +1,39 @@
+# -*- coding: utf-8 -*-
+
+import logging
+
+from .base import IPDetector
+
+log = logging.getLogger(__name__)
+
+
+class IPDetector_Null(IPDetector):
+
+    """Dummy IP detector."""
+
+    def __init__(self, family=None, *args, **kwargs):
+        """
+        Initializer.
+
+        :param family: IP address family (default: '' (ANY), also possible: 'INET', 'INET6')
+        """
+        super(IPDetector_Null, self).__init__(*args, family=family, **kwargs)
+
+    @staticmethod
+    def names():
+        return ("null",)
+
+    def can_detect_offline(self):
+        """Return true, as this detector generates no network traffic.
+
+        :return: True
+        """
+        return True
+
+    def detect(self):
+        """
+        Return None.
+
+        :rtype: None
+        """
+        return None

dyndnsc/tests/detector/test_all.py

@@ -188,3 +188,12 @@ def test_webcheck46(self):
         self.assertEqual(AF_UNSPEC, detector.af())
         self.assertEqual(None, detector.get_current_value())
         self.assertTrue(type(detector.detect()) in (type(None), str))
+
+    def test_null(self):
+        import dyndnsc.detector.null as null
+        self.assertTrue("null" in null.IPDetector_Null.names())
+        detector = null.IPDetector_Null()
+        self.assertTrue(detector.can_detect_offline())
+        self.assertEqual(AF_UNSPEC, detector.af())
+        self.assertEqual(None, detector.get_current_value())
+        self.assertTrue(type(detector.detect()) in (type(None), str))