tools: speed up Route() (#36963)

* tools: speed up Route()

* cleanup

tools/lib/route.py

@@ -23,7 +23,6 @@ class FileName:
 
 class Route:
   def __init__(self, name, data_dir=None):
-    self._metadata = None
     self._name = RouteName(name)
     self.files = None
     if data_dir is not None:
@@ -32,13 +31,6 @@ class Route:
       self._segments = self._get_segments_remote()
     self.max_seg_number = self._segments[-1].name.segment_num
 
-  @property
-  def metadata(self):
-    if not self._metadata:
-      api = CommaApi(get_token())
-      self._metadata = api.get('v1/route/' + self.name.canonical_name)
-    return self._metadata
-
   @property
   def name(self):
     return self._name
@@ -90,7 +82,6 @@ class Route:
           url if fn in FileName.DCAMERA else segments[segment_name].dcamera_path,
           url if fn in FileName.ECAMERA else segments[segment_name].ecamera_path,
           url if fn in FileName.QCAMERA else segments[segment_name].qcamera_path,
-          self.metadata['url'],
         )
       else:
         segments[segment_name] = Segment(
@@ -101,7 +92,6 @@ class Route:
           url if fn in FileName.DCAMERA else None,
           url if fn in FileName.ECAMERA else None,
           url if fn in FileName.QCAMERA else None,
-          self.metadata['url'],
         )
 
     return sorted(segments.values(), key=lambda seg: seg.name.segment_num)
@@ -167,7 +157,7 @@ class Route:
       except StopIteration:
         qcamera_path = None
 
-      segments.append(Segment(segment, log_path, qlog_path, camera_path, dcamera_path, ecamera_path, qcamera_path, self.metadata['url']))
+      segments.append(Segment(segment, log_path, qlog_path, camera_path, dcamera_path, ecamera_path, qcamera_path))
 
     if len(segments) == 0:
       raise ValueError(f'Could not find segments for route {self.name.canonical_name} in data directory {data_dir}')
@@ -175,10 +165,9 @@ class Route:
 
 
 class Segment:
-  def __init__(self, name, log_path, qlog_path, camera_path, dcamera_path, ecamera_path, qcamera_path, url):
+  def __init__(self, name, log_path, qlog_path, camera_path, dcamera_path, ecamera_path, qcamera_path):
     self._events = None
     self._name = SegmentName(name)
-    self.url = f'{url}/{self._name.segment_num}'
     self.log_path = log_path
     self.qlog_path = qlog_path
     self.camera_path = camera_path
@@ -190,6 +179,18 @@ class Segment:
   def name(self):
     return self._name
 
+  @staticmethod
+  @cache
+  def _get_route_metadata(route_name: str):
+    api = CommaApi(get_token())
+    return api.get(f'v1/route/{route_name}')
+
+  @property
+  def url(self):
+    route_name = self._name.route_name.canonical_name
+    metadata = self._get_route_metadata(route_name)
+    return f'{metadata["url"]}/{self._name.segment_num}'
+
   @property
   def events(self):
     if not self._events: