Revert "LogReader: wrap events to cache which() (#35882)"

This reverts commit 0ebee55050.

tools/lib/logreader.py

@@ -50,35 +50,8 @@ def decompress_stream(data: bytes):
 
   return decompressed_data
 
-
-class CachedReader:
-  __slots__ = ("_evt", "_enum")
-
-  def __init__(self, evt: capnp._DynamicStructReader):
-    """All capnp attribute accesses are expensive, and which() is often called multiple times"""
-    self._evt = evt
-    self._enum: str | None = None
-
-  def __repr__(self):
-    return self._evt.__repr__()
-
-  def __str__(self):
-    return self._evt.__str__()
-
-  def __dir__(self):
-    return dir(self._evt)
-
-  def which(self) -> str:
-    if self._enum is None:
-      self._enum = self._evt.which()
-    return self._enum
-
-  def __getattr__(self, name: str):
-    return getattr(self._evt, name)
-
-
 class _LogFileReader:
-  def __init__(self, fn, only_union_types=False, sort_by_time=False, dat=None):
+  def __init__(self, fn, canonicalize=True, only_union_types=False, sort_by_time=False, dat=None):
     self.data_version = None
     self._only_union_types = only_union_types
 
@@ -103,7 +76,7 @@ class _LogFileReader:
     self._ents = []
     try:
       for e in ents:
-        self._ents.append(CachedReader(e))
+        self._ents.append(e)
     except capnp.KjException:
       warnings.warn("Corrupted events detected", RuntimeWarning, stacklevel=1)