Refactor message type accessor, improve tests

Signed-off-by: Pierre R. Mai <pmai@pmsf.de>

osi3trace/osi2read.py

@@ -5,7 +5,7 @@
     python3 osi2read.py -d trace.osi -o myreadableosifile
 """
 
-from osi3trace.osi_trace import OSITrace, MESSAGES_TYPE
+from osi3trace.osi_trace import OSITrace
 import argparse
 import pathlib
 
@@ -28,7 +28,7 @@ def command_line_arguments():
         "--type",
         "-t",
         help="Name of the type used to serialize data.",
-        choices=list(MESSAGES_TYPE.keys()),
+        choices=OSITrace.message_types(),
         default="SensorView",
         type=str,
         required=False,

osi3trace/osi_trace.py

@@ -37,6 +37,11 @@ def map_message_type(type_name):
         """Map the type name to the protobuf message type."""
         return MESSAGES_TYPE[type_name]
 
+    @staticmethod
+    def message_types():
+        """Message types that OSITrace supports."""
+        return list(MESSAGES_TYPE.keys())
+
     def __init__(self, path=None, type_name="SensorView", cache_messages=False):
         self.type = self.map_message_type(type_name)
         self.file = None

tests/test_osi_trace.py

@@ -26,7 +26,10 @@ def test_osi_trace_sv(self):
             trace = OSITrace(path_input)
             with open(path_output, "wt") as f:
                 for message in trace:
+                    self.assertIsInstance(message, SensorView)
                     f.write(str(message))
+
+            self.assertEqual(len(trace.retrieve_offsets()), 10)
             trace.close()
 
             self.assertTrue(os.path.exists(path_output))
@@ -40,7 +43,10 @@ def test_osi_trace_gt(self):
             trace = OSITrace(path_input, "GroundTruth")
             with open(path_output, "wt") as f:
                 for message in trace:
+                    self.assertIsInstance(message, GroundTruth)
                     f.write(str(message))
+
+            self.assertEqual(len(trace.retrieve_offsets()), 10)
             trace.close()
 
             self.assertTrue(os.path.exists(path_output))
@@ -54,7 +60,10 @@ def test_osi_trace_sd(self):
             trace = OSITrace(path_input, "SensorData")
             with open(path_output, "wt") as f:
                 for message in trace:
+                    self.assertIsInstance(message, SensorData)
                     f.write(str(message))
+
+            self.assertEqual(len(trace.retrieve_offsets()), 10)
             trace.close()
 
             self.assertTrue(os.path.exists(path_output))
@@ -68,7 +77,10 @@ def test_osi_trace_svc(self):
             trace = OSITrace(path_input, "SensorViewConfiguration")
             with open(path_output, "wt") as f:
                 for message in trace:
+                    self.assertIsInstance(message, SensorViewConfiguration)
                     f.write(str(message))
+
+            self.assertEqual(len(trace.retrieve_offsets()), 1)
             trace.close()
 
             self.assertTrue(os.path.exists(path_output))
@@ -82,7 +94,10 @@ def test_osi_trace_tu(self):
             trace = OSITrace(path_input, "TrafficUpdate")
             with open(path_output, "wt") as f:
                 for message in trace:
+                    self.assertIsInstance(message, TrafficUpdate)
                     f.write(str(message))
+
+            self.assertEqual(len(trace.retrieve_offsets()), 10)
             trace.close()
 
             self.assertTrue(os.path.exists(path_output))
@@ -96,7 +111,10 @@ def test_osi_trace_tc(self):
             trace = OSITrace(path_input, "TrafficCommand")
             with open(path_output, "wt") as f:
                 for message in trace:
+                    self.assertIsInstance(message, TrafficCommand)
                     f.write(str(message))
+
+            self.assertEqual(len(trace.retrieve_offsets()), 10)
             trace.close()
 
             self.assertTrue(os.path.exists(path_output))
@@ -110,7 +128,10 @@ def test_osi_trace_tcu(self):
             trace = OSITrace(path_input, "TrafficCommandUpdate")
             with open(path_output, "wt") as f:
                 for message in trace:
+                    self.assertIsInstance(message, TrafficCommandUpdate)
                     f.write(str(message))
+
+            self.assertEqual(len(trace.retrieve_offsets()), 10)
             trace.close()
 
             self.assertTrue(os.path.exists(path_output))
@@ -124,7 +145,10 @@ def test_osi_trace_mr(self):
             trace = OSITrace(path_input, "MotionRequest")
             with open(path_output, "wt") as f:
                 for message in trace:
+                    self.assertIsInstance(message, MotionRequest)
                     f.write(str(message))
+
+            self.assertEqual(len(trace.retrieve_offsets()), 10)
             trace.close()
 
             self.assertTrue(os.path.exists(path_output))
@@ -138,7 +162,10 @@ def test_osi_trace_su(self):
             trace = OSITrace(path_input, "StreamingUpdate")
             with open(path_output, "wt") as f:
                 for message in trace:
+                    self.assertIsInstance(message, StreamingUpdate)
                     f.write(str(message))
+
+            self.assertEqual(len(trace.retrieve_offsets()), 10)
             trace.close()
 
             self.assertTrue(os.path.exists(path_output))