Catch value error when extract log info from log name

We need to catch ValueError when we extract log information
from the file name provided by user.
Instead of raising an exception, we just log a warning to the
user. The normal usage can handle None uuid or timestamp or
validation-id.
This will aim to make the ValidationLog class more generic.

Change-Id: Iccc2a37b4c2c911e634a210de253ba1111e5b7e7

validations_libs/tests/test_validation_log.py

@@ -37,6 +37,25 @@ class TestValidationLog(TestCase):
         self.assertEquals(val.validation_id, 'foo')
         self.assertEquals(val.datetime, '2020-03-30T13:17:22.447857Z')
 
+    @mock.patch('json.load')
+    @mock.patch('six.moves.builtins.open')
+    def test_validation_underscore_validation_id(self, mock_open, mock_json):
+        val = ValidationLog(
+            logfile='/tmp/123_foo_bar_2020-03-30T13:17:22.447857Z.json')
+        self.assertEquals(val.uuid, '123')
+        self.assertEquals(val.validation_id, 'foo_bar')
+        self.assertEquals(val.datetime, '2020-03-30T13:17:22.447857Z')
+
+    @mock.patch('json.load')
+    @mock.patch('six.moves.builtins.open')
+    def test_validation_wrong_log_file(self, mock_open, mock_json):
+        msg = ('Wrong log file format, it should be formed '
+               'such as {uuid}_{validation-id}_{timestamp}')
+        with mock.patch('logging.Logger.warning') as mock_log:
+            ValidationLog(
+                logfile='/tmp/foo_2020-03-30T13:17:22.447857Z.json')
+            mock_log.assert_called_with(msg)
+
     @mock.patch('glob.glob')
     @mock.patch('json.load',
                 return_value=fakes.VALIDATIONS_LOGS_CONTENTS_LIST[0])

validations_libs/validation_logs.py

@@ -41,9 +41,14 @@ class ValidationLog(object):
             full_path = self.get_log_path()
         self.content = self._get_content(full_path)
         self.name = os.path.splitext(os.path.basename(full_path))[0]
+        # if we have a log file then extract uuid, validation_id and timestamp
         if logfile:
-            self.uuid, self.validation_id, self.datetime = \
-                self.name.replace('.{}'.format(self.extension), '').split('_')
+            try:
+                self.uuid, _name = self.name.split('_', 1)
+                self.validation_id, self.datetime = _name.rsplit('_', 1)
+            except ValueError:
+                logging.warning('Wrong log file format, it should be formed '
+                                'such as {uuid}_{validation-id}_{timestamp}')
 
     def _get_content(self, file):
         try: