diff options
| -rw-r--r-- | tests/test_stats_grammar.py | 10 | ||||
| -rw-r--r-- | trappy/stats/grammar.py | 7 |
2 files changed, 16 insertions, 1 deletions
diff --git a/tests/test_stats_grammar.py b/tests/test_stats_grammar.py index de62f21..5138efc 100644 --- a/tests/test_stats_grammar.py +++ b/tests/test_stats_grammar.py @@ -244,3 +244,13 @@ trappy.thermal.Thermal:temp" prs = Parser(trace, filters={"cdev_state": 3}) dfr_res = prs.solve("devfreq_out_power:freq") self.assertEquals(len(dfr_res), 1) + + def test_no_events(self): + """Test trying to parse absent data""" + trace = trappy.FTrace() + prs = Parser(trace) + + # cpu_frequency is an event we know how to parse, but it isn't present + # in the test trace. + self.assertRaisesRegexp(ValueError, "No events found for cpu_frequency", + prs.solve, "cpu_frequency:frequency") diff --git a/trappy/stats/grammar.py b/trappy/stats/grammar.py index 05a6315..1f5820b 100644 --- a/trappy/stats/grammar.py +++ b/trappy/stats/grammar.py @@ -411,6 +411,9 @@ class Parser(object): """Pivot Data for concatenation""" data_frame = self._get_data_frame(cls) + if data_frame.empty: + raise ValueError("No events found for {}".format(cls.name)) + data_frame = handle_duplicate_index(data_frame) new_index = self._agg_df.index.union(data_frame.index) @@ -525,7 +528,9 @@ class Parser(object): data_frame = getattr(self.data, cls.name).data_frame - if self._window[1] is None: + if data_frame.empty: + return data_frame + elif self._window[1] is None: data_frame = data_frame.loc[self._window[0]:] else: data_frame = data_frame.loc[self._window[0]:self._window[1]] |