Deprecation notices

CHANGELOG.md

@@ -2,6 +2,14 @@
 All notable changes to `dash` will be documented in this file.
 This project adheres to [Semantic Versioning](https://semver.org/).
 
+## [UNRELEASED]
+
+## Deprecated
+
+- [#2985](https://github.com/plotly/dash/pull/2985) Deprecate dynamic component loader.
+- [#2985](https://github.com/plotly/dash/pull/2985) Deprecate `run_server`, use `run` instead.
+- [#2899](https://github.com/plotly/dash/pull/2899) Deprecate `dcc.LogoutButton`, can be replaced with a `html.Button` or `html.A`. eg: `html.A(href=os.getenv('DASH_LOGOUT_URL'))` on a Dash Enterprise instance.
+
 ## [2.18.0] - 2024-09-04
 
 ## Added

components/dash-core-components/tests/integration/location/test_location_logout.py

@@ -1,47 +1,30 @@
-from dash.exceptions import PreventUpdate
 from dash import Dash, Input, Output, dcc, html
-import flask
+import pytest
 import time
 
 
-def test_llgo001_location_logout(dash_dcc):
+@pytest.mark.parametrize("add_initial_logout_button", [False, True])
+def test_llgo001_location_logout(dash_dcc, add_initial_logout_button):
+    # FIXME: Logout button is deprecated, remove this test for dash 3.0
     app = Dash(__name__)
 
-    @app.server.route("/_logout", methods=["POST"])
-    def on_logout():
-        rep = flask.redirect("/logged-out")
-        rep.set_cookie("logout-cookie", "", 0)
-        return rep
-
-    app.layout = html.Div(
-        [html.H2("Logout test"), dcc.Location(id="location"), html.Div(id="content")]
-    )
-
-    @app.callback(Output("content", "children"), [Input("location", "pathname")])
-    def on_location(location_path):
-        if location_path is None:
-            raise PreventUpdate
-
-        if "logged-out" in location_path:
-            return "Logged out"
+    with pytest.warns(
+        DeprecationWarning,
+        match="The Logout Button is no longer used with Dash Enterprise and can be replaced with a html.Button or html.A.",
+    ):
+        app.layout = [
+            html.H2("Logout test"),
+            html.Div(id="content"),
+        ]
+        if add_initial_logout_button:
+            app.layout.append(dcc.LogoutButton())
         else:
 
-            @flask.after_this_request
-            def _insert_cookie(rep):
-                rep.set_cookie("logout-cookie", "logged-in")
-                return rep
-
-            return dcc.LogoutButton(id="logout-btn", logout_url="/_logout")
-
-    dash_dcc.start_server(app)
-    time.sleep(1)
-    dash_dcc.percy_snapshot("Core Logout button")
-
-    assert dash_dcc.driver.get_cookie("logout-cookie")["value"] == "logged-in"
-
-    dash_dcc.wait_for_element("#logout-btn").click()
-    dash_dcc.wait_for_text_to_equal("#content", "Logged out")
+            @app.callback(Output("content", "children"), Input("content", "id"))
+            def on_location(location_path):
+                return dcc.LogoutButton(id="logout-btn", logout_url="/_logout")
 
-    assert not dash_dcc.driver.get_cookie("logout-cookie")
+            dash_dcc.start_server(app)
+            time.sleep(1)
 
-    assert dash_dcc.get_logs() == []
+            assert dash_dcc.get_logs() == []

dash/dash.py

@@ -2256,4 +2256,9 @@ def run_server(self, *args, **kwargs):
 
         See `app.run` for usage information.
         """
+        warnings.warn(
+            DeprecationWarning(
+                "Dash.run_server is deprecated and will be removed in Dash 3.0"
+            )
+        )
         self.run(*args, **kwargs)

dash/development/base_component.py

@@ -4,13 +4,26 @@
 import sys
 import uuid
 import random
+import warnings
+import textwrap
 
 from .._utils import patch_collections_abc, stringify_id, OrderedSet
 
 MutableSequence = patch_collections_abc("MutableSequence")
 
 rd = random.Random(0)
 
+_deprecated_components = {
+    "dash_core_components": {
+        "LogoutButton": textwrap.dedent(
+            """
+        The Logout Button is no longer used with Dash Enterprise and can be replaced with a html.Button or html.A.
+        eg: html.A(href=os.getenv('DASH_LOGOUT_URL'))
+    """
+        )
+    }
+}
+
 
 # pylint: disable=no-init,too-few-public-methods
 class ComponentRegistry:
@@ -95,6 +108,7 @@ def __str__(self):
     REQUIRED = _REQUIRED()
 
     def __init__(self, **kwargs):
+        self._validate_deprecation()
         import dash  # pylint: disable=import-outside-toplevel, cyclic-import
 
         # pylint: disable=super-init-not-called
@@ -405,6 +419,13 @@ def __repr__(self):
             props_string = repr(getattr(self, "children", None))
         return f"{self._type}({props_string})"
 
+    def _validate_deprecation(self):
+        _type = getattr(self, "_type", "")
+        _ns = getattr(self, "_namespace", "")
+        deprecation_message = _deprecated_components.get(_ns, {}).get(_type)
+        if deprecation_message:
+            warnings.warn(DeprecationWarning(textwrap.dedent(deprecation_message)))
+
 
 def _explicitize_args(func):
     # Python 2

dash/development/component_loader.py

@@ -1,6 +1,8 @@
 import collections
 import json
 import os
+import warnings
+
 
 from ._py_components_generation import (
     generate_class_file,
@@ -34,7 +36,13 @@ def load_components(metadata_path, namespace="default_namespace"):
     components -- a list of component objects with keys
     `type`, `valid_kwargs`, and `setup`.
     """
-
+    warnings.warn(
+        DeprecationWarning(
+            "Dynamic components loading has been deprecated and will be removed"
+            " in dash 3.0.\n"
+            f"Update {namespace} to generate components with dash-generate-components"
+        )
+    )
     # Register the component lib for index include.
     ComponentRegistry.registry.add(namespace)
     components = []