LogReader: fix sort by time and union types (#31565)

* fix :(

* test_sort_by_time

* this isn't required

* not slow, and just compare sorted

* messy

* works

* clean up

* clean up

* not here

* clean up

* clean up

* clean up

* makes network call

---------

Co-authored-by: Justin Newberry <justin@comma.ai>
old-commit-hash: e964c5944d

tools/lib/logreader.py

@@ -248,7 +248,7 @@ are uploaded or auto fallback to qlogs with '/a' selector at the end of the rout
 
   def _get_lr(self, i):
     if i not in self.__lrs:
-      self.__lrs[i] = _LogFileReader(self.logreader_identifiers[i])
+      self.__lrs[i] = _LogFileReader(self.logreader_identifiers[i], sort_by_time=self.sort_by_time, only_union_types=self.only_union_types)
     return self.__lrs[i]
 
   def __iter__(self):

tools/lib/tests/test_logreader.py

@@ -1,4 +1,5 @@
 #!/usr/bin/env python3
+import capnp
 import contextlib
 import io
 import shutil
@@ -11,6 +12,7 @@ import requests
 from parameterized import parameterized
 from unittest import mock
 
+from cereal import log as capnp_log
 from openpilot.tools.lib.logreader import LogIterable, LogReader, comma_api_source, parse_indirect, ReadMode, InternalUnavailableException
 from openpilot.tools.lib.route import SegmentRange
 from openpilot.tools.lib.url_file import URLFileException
@@ -216,6 +218,43 @@ class TestLogReader(unittest.TestCase):
       log_len = len(list(lr))
       self.assertEqual(qlog_len, log_len)
 
+  @pytest.mark.slow
+  def test_sort_by_time(self):
+    msgs = list(LogReader(f"{TEST_ROUTE}/0/q"))
+    self.assertNotEqual(msgs, sorted(msgs, key=lambda m: m.logMonoTime))
+
+    msgs = list(LogReader(f"{TEST_ROUTE}/0/q", sort_by_time=True))
+    self.assertEqual(msgs, sorted(msgs, key=lambda m: m.logMonoTime))
+
+  def test_only_union_types(self):
+    with tempfile.NamedTemporaryFile() as qlog:
+      # write valid Event messages
+      num_msgs = 100
+      with open(qlog.name, "wb") as f:
+        f.write(b"".join(capnp_log.Event.new_message().to_bytes() for _ in range(num_msgs)))
+
+      msgs = list(LogReader(qlog.name))
+      self.assertEqual(len(msgs), num_msgs)
+      [m.which() for m in msgs]
+
+      # append non-union Event message
+      event_msg = capnp_log.Event.new_message()
+      non_union_bytes = bytearray(event_msg.to_bytes())
+      non_union_bytes[event_msg.total_size.word_count * 8] = 0xff  # set discriminant value out of range using Event word offset
+      with open(qlog.name, "ab") as f:
+        f.write(non_union_bytes)
+
+      # ensure new message is added, but is not a union type
+      msgs = list(LogReader(qlog.name))
+      self.assertEqual(len(msgs), num_msgs + 1)
+      with self.assertRaises(capnp.KjException):
+        [m.which() for m in msgs]
+
+      # should not be added when only_union_types=True
+      msgs = list(LogReader(qlog.name, only_union_types=True))
+      self.assertEqual(len(msgs), num_msgs)
+      [m.which() for m in msgs]
+
 
 if __name__ == "__main__":
   unittest.main()