LogReader: fix plotjuggler not reading properly (#31023)

* fix plotjuggler

* simpler

* fix juggler

* fix that
old-commit-hash: 61fe705160

tools/plotjuggler/juggle.py

@@ -1,5 +1,4 @@
 #!/usr/bin/env python3
-import multiprocessing
 import os
 import sys
 import platform
@@ -76,10 +75,7 @@ def process(can, lr):
 def juggle_route(route_or_segment_name, can, layout, dbc=None):
   sr = LogReader(route_or_segment_name)
 
-  with multiprocessing.Pool(24) as pool:
-    all_data = []
-    for p in pool.map(partial(process, can), sr.lrs):
-      all_data.extend(p)
+  all_data = sr.run_across_segments(24, partial(process, can))
 
   # Infer DBC name from logs
   if dbc is None:

tools/plotjuggler/test_plotjuggler.py

@@ -31,6 +31,8 @@ class TestPlotJuggler(unittest.TestCase):
       self.assertEqual(p.poll(), None)
       os.killpg(os.getpgid(p.pid), signal.SIGTERM)
 
+      self.assertNotIn("Raw file read failed", output)
+
   # TODO: also test that layouts successfully load
   def test_layouts(self):
     bad_strings = (