Remove enable_component_tree_diffs flag (google#547)

This feature has been enabled for long enough that we feel comfortable
with removing the option to disable this behavior.

mesop/colab/colab_run.py

@@ -26,8 +26,7 @@ def colab_run(*, port: int = 32123, prod_mode: bool = False):
  # Depending on the Colab environment, the flags may or may not be parsed.
  #
  # Note: this ignore all Mesop CLI flags, but we could provide a way to override
- # Mesop defined flags in the future (e.g. enable_component_tree_diffs)
- # if necessary.
+ # Mesop defined flags in the future if necessary.
  if not flags.FLAGS.is_parsed():
  flags.FLAGS.mark_as_parsed()
  flask_app = configure_flask_app(prod_mode=prod_mode)

mesop/runtime/context.py

@@ -1,8 +1,6 @@
 import copy
 from typing import Any, Callable, Generator, TypeVar, cast
 
-from absl import flags
-
 import mesop.protos.ui_pb2 as pb
 from mesop.dataclass_utils import (
  diff_state,
@@ -15,15 +13,6 @@
 )
 from mesop.server.state_session import state_session
 
-FLAGS = flags.FLAGS
-
-flags.DEFINE_bool(
- "enable_component_tree_diffs",
- True,
- "set to true to return component tree diffs on user event responses (rather than the full tree).",
-)
-
-
 T = TypeVar("T")
 
 Handler = Callable[[Any], Generator[None, None, None] | None]
@@ -92,9 +81,7 @@ def current_node(self) -> pb.Component:
  def previous_node(self) -> pb.Component | None:
  """Used to track the last/previous state of the component tree before the UI updated.
 
- This is used for performing component tree diffs when the
- `enable_component_tree_diffs` flag is enabled. When previous node is `None`, that
- implies that no component tree diff is to be performed.
+ This is used for performing component tree diffs.
  """
  return self._previous_node
 
@@ -112,12 +99,7 @@ def set_current_node(self, node: pb.Component) -> None:
  self._current_node = node
 
  def set_previous_node_from_current_node(self) -> None:
- # Gate this feature with a flag since this is a new feature and may have some
- # unexpected issues. In addition, some users may have a case where sending the full
- # component tree back on each response is more performant than sending back the
- # diff.
- if FLAGS.enable_component_tree_diffs:
- self._previous_node = self._current_node
+ self._previous_node = self._current_node
 
  def reset_current_node(self) -> None:
  self._current_node = pb.Component()

mesop/server/wsgi_app.py

@@ -70,8 +70,7 @@ def wsgi_app(environ: dict[Any, Any], start_response: Callable[..., Any]):
  # $ gunicorn --bind :8080 main:me
  #
  # We will ignore all CLI flags, but we could provide a way to override
- # Mesop defined flags in the future (e.g. enable_component_tree_diffs)
- # if necessary.
+ # Mesop defined flags in the future if necessary.
  #
  # Note: absl-py requires the first arg (program name), and will raise an error
  # if we pass an empty list.