From 087be8637f545370246f14cd3966811d7a36c244 Mon Sep 17 00:00:00 2001
From: Archmonger <16909269+Archmonger@users.noreply.github.com>
Date: Thu, 3 Aug 2023 23:21:31 -0700
Subject: [PATCH 01/15] Use DB for clean tracking

---
 CHANGELOG.md                                 |  4 ++-
 docs/python/settings.py                      |  2 +-
 src/reactpy_django/components.py             |  1 -
 src/reactpy_django/migrations/0004_config.py | 27 +++++++++++++++
 src/reactpy_django/models.py                 | 16 +++++++++
 src/reactpy_django/utils.py                  | 35 +++++---------------
 tests/test_app/admin.py                      | 11 ++++--
 7 files changed, 63 insertions(+), 33 deletions(-)
 create mode 100644 src/reactpy_django/migrations/0004_config.py

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 10bb1d3f..0f9782c9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -34,7 +34,9 @@ Using the following categories, list your changes in this order:
 
 ## [Unreleased]
 
--   Nothing yet!
+### Changed
+
+-   A thread-safe cache is no longer required.
 
 ## [3.2.1] - 2023-06-29
 
diff --git a/docs/python/settings.py b/docs/python/settings.py
index a08dbc55..2a4e46e6 100644
--- a/docs/python/settings.py
+++ b/docs/python/settings.py
@@ -1,4 +1,4 @@
-# ReactPy requires a multiprocessing-safe and thread-safe cache.
+# ReactPy benefits from a fast, well indexed cache.
 REACTPY_CACHE = "default"
 
 # ReactPy requires a multiprocessing-safe and thread-safe database.
diff --git a/src/reactpy_django/components.py b/src/reactpy_django/components.py
index a4e31840..9d6e6a98 100644
--- a/src/reactpy_django/components.py
+++ b/src/reactpy_django/components.py
@@ -210,7 +210,6 @@ def _cached_static_contents(static_path: str):
         )
 
     # Fetch the file from cache, if available
-    # Cache is preferrable to `use_memo` due to multiprocessing capabilities
     last_modified_time = os.stat(abs_path).st_mtime
     cache_key = f"reactpy_django:static_contents:{static_path}"
     file_contents = caches[REACTPY_CACHE].get(
diff --git a/src/reactpy_django/migrations/0004_config.py b/src/reactpy_django/migrations/0004_config.py
new file mode 100644
index 00000000..61b093d9
--- /dev/null
+++ b/src/reactpy_django/migrations/0004_config.py
@@ -0,0 +1,27 @@
+# Generated by Django 4.2.3 on 2023-08-04 05:49
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("reactpy_django", "0003_componentsession_delete_componentparams"),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name="Config",
+            fields=[
+                (
+                    "id",
+                    models.BigAutoField(
+                        auto_created=True,
+                        primary_key=True,
+                        serialize=False,
+                        verbose_name="ID",
+                    ),
+                ),
+                ("cleaned_at", models.DateTimeField(auto_now_add=True)),
+            ],
+        ),
+    ]
diff --git a/src/reactpy_django/models.py b/src/reactpy_django/models.py
index 79d22072..65152126 100644
--- a/src/reactpy_django/models.py
+++ b/src/reactpy_django/models.py
@@ -9,3 +9,19 @@ class ComponentSession(models.Model):
     uuid = models.UUIDField(primary_key=True, editable=False, unique=True)  # type: ignore
     params = models.BinaryField(editable=False)  # type: ignore
     last_accessed = models.DateTimeField(auto_now_add=True)  # type: ignore
+
+
+class Config(models.Model):
+    """A singleton model for storing ReactPy configuration."""
+
+    cleaned_at = models.DateTimeField(auto_now_add=True)  # type: ignore
+
+    def save(self, *args, **kwargs):
+        """Singleton save method."""
+        self.pk = 1
+        super().save(*args, **kwargs)
+
+    @classmethod
+    def load(cls):
+        obj, created = cls.objects.get_or_create(pk=1)
+        return obj
diff --git a/src/reactpy_django/utils.py b/src/reactpy_django/utils.py
index 219f5c3e..105bede6 100644
--- a/src/reactpy_django/utils.py
+++ b/src/reactpy_django/utils.py
@@ -12,7 +12,6 @@
 from typing import Any, Callable, Sequence
 
 from channels.db import database_sync_to_async
-from django.core.cache import caches
 from django.db.models import ManyToManyField, ManyToOneRel, prefetch_related_objects
 from django.db.models.base import Model
 from django.db.models.query import QuerySet
@@ -24,7 +23,6 @@
 
 from reactpy_django.exceptions import ComponentDoesNotExistError, ComponentParamError
 
-
 _logger = logging.getLogger(__name__)
 _component_tag = r"(?P<tag>component)"
 _component_path = r"(?P<path>\"[^\"'\s]+\"|'[^\"'\s]+')"
@@ -332,39 +330,22 @@ def create_cache_key(*args):
 def db_cleanup(immediate: bool = False):
     """Deletes expired component sessions from the database.
     This function may be expanded in the future to include additional cleanup tasks."""
-    from .config import (
-        REACTPY_CACHE,
-        REACTPY_DATABASE,
-        REACTPY_DEBUG_MODE,
-        REACTPY_RECONNECT_MAX,
-    )
-    from .models import ComponentSession
+    from .config import REACTPY_DATABASE, REACTPY_DEBUG_MODE, REACTPY_RECONNECT_MAX
+    from .models import ComponentSession, Config
 
     clean_started_at = datetime.now()
-    cache_key: str = create_cache_key("last_cleaned")
-    now_str: str = datetime.strftime(timezone.now(), DATE_FORMAT)
-    cleaned_at_str: str = caches[REACTPY_CACHE].get(cache_key)
-    cleaned_at: datetime = timezone.make_aware(
-        datetime.strptime(cleaned_at_str or now_str, DATE_FORMAT)
-    )
+    config = Config.load()
+    cleaned_at = config.cleaned_at
     clean_needed_by = cleaned_at + timedelta(seconds=REACTPY_RECONNECT_MAX)
-    expires_by: datetime = timezone.now() - timedelta(seconds=REACTPY_RECONNECT_MAX)
-
-    # Component params exist in the DB, but we don't know when they were last cleaned
-    if not cleaned_at_str and ComponentSession.objects.using(REACTPY_DATABASE).all():
-        _logger.warning(
-            "ReactPy has detected component sessions in the database, "
-            "but no timestamp was found in cache. This may indicate that "
-            "the cache has been cleared."
-        )
+    expires_by = timezone.now() - timedelta(seconds=REACTPY_RECONNECT_MAX)
 
     # Delete expired component parameters
-    # Use timestamps in cache (`cleaned_at_str`) as a no-dependency rate limiter
-    if immediate or not cleaned_at_str or timezone.now() >= clean_needed_by:
+    if immediate or timezone.now() >= clean_needed_by:
         ComponentSession.objects.using(REACTPY_DATABASE).filter(
             last_accessed__lte=expires_by
         ).delete()
-        caches[REACTPY_CACHE].set(cache_key, now_str, timeout=None)
+        config.cleaned_at = timezone.now()
+        config.save()
 
     # Check if cleaning took abnormally long
     clean_duration = datetime.now() - clean_started_at
diff --git a/tests/test_app/admin.py b/tests/test_app/admin.py
index 99f40e46..77e43d4c 100644
--- a/tests/test_app/admin.py
+++ b/tests/test_app/admin.py
@@ -1,4 +1,6 @@
 from django.contrib import admin
+from reactpy_django.models import ComponentSession, Config
+
 from test_app.models import (
     AsyncForiegnChild,
     AsyncRelationalChild,
@@ -10,8 +12,6 @@
     TodoItem,
 )
 
-from reactpy_django.models import ComponentSession
-
 
 @admin.register(TodoItem)
 class TodoItemAdmin(admin.ModelAdmin):
@@ -55,4 +55,9 @@ class AsyncForiegnChildAdmin(admin.ModelAdmin):
 
 @admin.register(ComponentSession)
 class ComponentSessionAdmin(admin.ModelAdmin):
-    list_display = ("uuid", "last_accessed")
+    list_display = ["uuid", "last_accessed"]
+
+
+@admin.register(Config)
+class ConfigAdmin(admin.ModelAdmin):
+    list_display = ["pk", "cleaned_at"]

From c92bed3420e4dc34d4227480d317334b51d9db7a Mon Sep 17 00:00:00 2001
From: Archmonger <16909269+Archmonger@users.noreply.github.com>
Date: Thu, 3 Aug 2023 23:38:41 -0700
Subject: [PATCH 02/15] store file contents in cache instead of response

Increase timeout
---
 src/reactpy_django/http/views.py | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/src/reactpy_django/http/views.py b/src/reactpy_django/http/views.py
index 752e263b..cdca407e 100644
--- a/src/reactpy_django/http/views.py
+++ b/src/reactpy_django/http/views.py
@@ -25,18 +25,18 @@ async def web_modules_file(request: HttpRequest, file: str) -> HttpResponse:
 
     # Fetch the file from cache, if available
     last_modified_time = os.stat(path).st_mtime
-    cache_key = create_cache_key("web_module", str(path).lstrip(str(web_modules_dir)))
-    response = await caches[REACTPY_CACHE].aget(
+    cache_key = create_cache_key("web_modules", str(path).lstrip(str(web_modules_dir)))
+    file_contents = await caches[REACTPY_CACHE].aget(
         cache_key, version=int(last_modified_time)
     )
-    if response is None:
+    if file_contents is None:
         async with async_open(path, "r") as fp:
-            response = HttpResponse(await fp.read(), content_type="text/javascript")
+            file_contents = await fp.read()
         await caches[REACTPY_CACHE].adelete(cache_key)
         await caches[REACTPY_CACHE].aset(
-            cache_key, response, timeout=None, version=int(last_modified_time)
+            cache_key, file_contents, timeout=604800, version=int(last_modified_time)
         )
-    return response
+    return HttpResponse(file_contents, content_type="text/javascript")
 
 
 async def view_to_component_iframe(

From af98d446a07d4c745b115f5a0e6d05832484658a Mon Sep 17 00:00:00 2001
From: Archmonger <16909269+Archmonger@users.noreply.github.com>
Date: Fri, 4 Aug 2023 00:27:58 -0700
Subject: [PATCH 03/15] fix lint

---
 src/reactpy_django/utils.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/reactpy_django/utils.py b/src/reactpy_django/utils.py
index 105bede6..a5189b85 100644
--- a/src/reactpy_django/utils.py
+++ b/src/reactpy_django/utils.py
@@ -264,7 +264,7 @@ def django_query_postprocessor(
             # Force the query to execute
             getattr(data, field.name, None)
 
-            if many_to_one and type(field) == ManyToOneRel:
+            if many_to_one and type(field) == ManyToOneRel:  # noqa: #E721
                 prefetch_fields.append(field.related_name or f"{field.name}_set")
 
             elif many_to_many and isinstance(field, ManyToManyField):

From 296a8edd4836b395ad362463dff8bc11af96bd06 Mon Sep 17 00:00:00 2001
From: Archmonger <16909269+Archmonger@users.noreply.github.com>
Date: Fri, 4 Aug 2023 00:53:47 -0700
Subject: [PATCH 04/15] fix test case

---
 src/reactpy_django/utils.py           | 10 +++++-----
 tests/test_app/tests/test_database.py | 14 +++++++++++---
 2 files changed, 16 insertions(+), 8 deletions(-)

diff --git a/src/reactpy_django/utils.py b/src/reactpy_django/utils.py
index 8ed3c75a..df8503a4 100644
--- a/src/reactpy_django/utils.py
+++ b/src/reactpy_django/utils.py
@@ -5,7 +5,7 @@
 import logging
 import os
 import re
-from datetime import datetime, timedelta
+from datetime import timedelta
 from fnmatch import fnmatch
 from importlib import import_module
 from inspect import iscoroutinefunction
@@ -333,20 +333,20 @@ def db_cleanup(immediate: bool = False):
     from .config import REACTPY_DEBUG_MODE, REACTPY_RECONNECT_MAX
     from .models import ComponentSession, Config
 
-    clean_started_at = datetime.now()
     config = Config.load()
+    start_time = timezone.now()
     cleaned_at = config.cleaned_at
     clean_needed_by = cleaned_at + timedelta(seconds=REACTPY_RECONNECT_MAX)
-    expires_by = timezone.now() - timedelta(seconds=REACTPY_RECONNECT_MAX)
 
     # Delete expired component parameters
     if immediate or timezone.now() >= clean_needed_by:
-        ComponentSession.objects.filter(last_accessed__lte=expires_by).delete()
+        expiration_date = timezone.now() - timedelta(seconds=REACTPY_RECONNECT_MAX)
+        ComponentSession.objects.filter(last_accessed__lte=expiration_date).delete()
         config.cleaned_at = timezone.now()
         config.save()
 
     # Check if cleaning took abnormally long
-    clean_duration = datetime.now() - clean_started_at
+    clean_duration = timezone.now() - start_time
     if REACTPY_DEBUG_MODE and clean_duration.total_seconds() > 1:
         _logger.warning(
             "ReactPy has taken %s seconds to clean up expired component sessions. "
diff --git a/tests/test_app/tests/test_database.py b/tests/test_app/tests/test_database.py
index d6bd9059..ac074209 100644
--- a/tests/test_app/tests/test_database.py
+++ b/tests/test_app/tests/test_database.py
@@ -4,7 +4,6 @@
 
 import dill as pickle
 from django.test import TransactionTestCase
-
 from reactpy_django import utils
 from reactpy_django.models import ComponentSession
 from reactpy_django.types import ComponentParamData
@@ -13,6 +12,11 @@
 class RoutedDatabaseTests(TransactionTestCase):
     databases = {"reactpy"}
 
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
+        utils.db_cleanup(immediate=True)
+
     def test_component_params(self):
         # Make sure the ComponentParams table is empty
         self.assertEqual(ComponentSession.objects.count(), 0)
@@ -20,7 +24,9 @@ def test_component_params(self):
 
         # Check if a component params are in the database
         self.assertEqual(ComponentSession.objects.count(), 1)
-        self.assertEqual(pickle.loads(ComponentSession.objects.first().params), params_1)  # type: ignore
+        self.assertEqual(
+            pickle.loads(ComponentSession.objects.first().params), params_1
+        )
 
         # Force `params_1` to expire
         from reactpy_django import config
@@ -37,7 +43,9 @@ def test_component_params(self):
 
         # Make sure `params_1` has expired
         self.assertEqual(ComponentSession.objects.count(), 1)
-        self.assertEqual(pickle.loads(ComponentSession.objects.first().params), params_2)  # type: ignore
+        self.assertEqual(
+            pickle.loads(ComponentSession.objects.first().params), params_2
+        )
 
     def _save_params_to_db(self, value: Any) -> ComponentParamData:
         db = list(self.databases)[0]

From c2be2bf4df1305c32a4071aa54c1ea7c331effc4 Mon Sep 17 00:00:00 2001
From: Archmonger <16909269+Archmonger@users.noreply.github.com>
Date: Fri, 4 Aug 2023 00:58:12 -0700
Subject: [PATCH 05/15] fix types

---
 tests/test_app/tests/test_database.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tests/test_app/tests/test_database.py b/tests/test_app/tests/test_database.py
index ac074209..3bd23527 100644
--- a/tests/test_app/tests/test_database.py
+++ b/tests/test_app/tests/test_database.py
@@ -25,7 +25,7 @@ def test_component_params(self):
         # Check if a component params are in the database
         self.assertEqual(ComponentSession.objects.count(), 1)
         self.assertEqual(
-            pickle.loads(ComponentSession.objects.first().params), params_1
+            pickle.loads(ComponentSession.objects.first().params), params_1  # type: ignore
         )
 
         # Force `params_1` to expire
@@ -44,7 +44,7 @@ def test_component_params(self):
         # Make sure `params_1` has expired
         self.assertEqual(ComponentSession.objects.count(), 1)
         self.assertEqual(
-            pickle.loads(ComponentSession.objects.first().params), params_2
+            pickle.loads(ComponentSession.objects.first().params), params_2  # type: ignore
         )
 
     def _save_params_to_db(self, value: Any) -> ComponentParamData:

From abff1550b5faba191ed3c31347ac5f9e78b13fc4 Mon Sep 17 00:00:00 2001
From: Archmonger <16909269+Archmonger@users.noreply.github.com>
Date: Fri, 4 Aug 2023 03:36:54 -0700
Subject: [PATCH 06/15] more simple cache key

---
 src/reactpy_django/http/views.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/reactpy_django/http/views.py b/src/reactpy_django/http/views.py
index cdca407e..9ebab9d5 100644
--- a/src/reactpy_django/http/views.py
+++ b/src/reactpy_django/http/views.py
@@ -25,7 +25,7 @@ async def web_modules_file(request: HttpRequest, file: str) -> HttpResponse:
 
     # Fetch the file from cache, if available
     last_modified_time = os.stat(path).st_mtime
-    cache_key = create_cache_key("web_modules", str(path).lstrip(str(web_modules_dir)))
+    cache_key = create_cache_key("web_modules", path)
     file_contents = await caches[REACTPY_CACHE].aget(
         cache_key, version=int(last_modified_time)
     )

From 55c59658f20b0cc2179e154a620e9805079a764e Mon Sep 17 00:00:00 2001
From: Archmonger <16909269+Archmonger@users.noreply.github.com>
Date: Fri, 4 Aug 2023 03:39:29 -0700
Subject: [PATCH 07/15] more simple join path

---
 src/reactpy_django/http/views.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/reactpy_django/http/views.py b/src/reactpy_django/http/views.py
index 9ebab9d5..12129791 100644
--- a/src/reactpy_django/http/views.py
+++ b/src/reactpy_django/http/views.py
@@ -15,7 +15,7 @@ async def web_modules_file(request: HttpRequest, file: str) -> HttpResponse:
     from reactpy_django.config import REACTPY_CACHE
 
     web_modules_dir = REACTPY_WEB_MODULES_DIR.current
-    path = os.path.abspath(web_modules_dir.joinpath(*file.split("/")))
+    path = os.path.abspath(web_modules_dir.joinpath(file))
 
     # Prevent attempts to walk outside of the web modules dir
     if str(web_modules_dir) != os.path.commonpath((path, web_modules_dir)):

From 966b8d0f5e57438896cf7772cdf1613daf33ef71 Mon Sep 17 00:00:00 2001
From: Archmonger <16909269+Archmonger@users.noreply.github.com>
Date: Fri, 4 Aug 2023 03:45:49 -0700
Subject: [PATCH 08/15] fix typo in the docs

---
 docs/src/contribute/running-tests.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/docs/src/contribute/running-tests.md b/docs/src/contribute/running-tests.md
index c9145c2d..79d3b114 100644
--- a/docs/src/contribute/running-tests.md
+++ b/docs/src/contribute/running-tests.md
@@ -41,5 +41,5 @@ Alternatively, if you want to only run Django related tests, you can use the fol
 
 ```bash linenums="0"
 cd tests
-python mange.py test
+python manage.py test
 ```

From e636578fd07dd773717fad742042e50920cb5e14 Mon Sep 17 00:00:00 2001
From: Archmonger <16909269+Archmonger@users.noreply.github.com>
Date: Fri, 4 Aug 2023 03:51:44 -0700
Subject: [PATCH 09/15] Rework some of the warnings

---
 src/reactpy_django/checks.py | 22 ++--------------------
 1 file changed, 2 insertions(+), 20 deletions(-)

diff --git a/src/reactpy_django/checks.py b/src/reactpy_django/checks.py
index 3feb4f18..5268fa1f 100644
--- a/src/reactpy_django/checks.py
+++ b/src/reactpy_django/checks.py
@@ -25,23 +25,6 @@ def reactpy_warnings(app_configs, **kwargs):
             )
         )
 
-    # REACTPY_CACHE is not an in-memory cache.
-    if getattr(settings, "CACHES", {}).get(
-        getattr(settings, "REACTPY_CACHE", "default"), {}
-    ).get("BACKEND", None) in {
-        "django.core.cache.backends.dummy.DummyCache",
-        "django.core.cache.backends.locmem.LocMemCache",
-    }:
-        warnings.append(
-            Warning(
-                "Using ReactPy with an in-memory cache can cause unexpected "
-                "behaviors.",
-                hint="Configure settings.py:CACHES[REACTPY_CACHE], to use a "
-                "multiprocessing and thread safe cache.",
-                id="reactpy_django.W002",
-            )
-        )
-
     # ReactPy URLs exist
     try:
         reverse("reactpy:web_modules", kwargs={"file": "example"})
@@ -52,7 +35,7 @@ def reactpy_warnings(app_configs, **kwargs):
                 "ReactPy URLs have not been registered.",
                 hint="""Add 'path("reactpy/", include("reactpy_django.http.urls"))' """
                 "to your application's urlpatterns.",
-                id="reactpy_django.W003",
+                id="reactpy_django.W002",
             )
         )
 
@@ -69,8 +52,7 @@ def reactpy_errors(app_configs, **kwargs):
     if not getattr(settings, "ASGI_APPLICATION", None):
         errors.append(
             Error(
-                "ASGI_APPLICATION is not defined."
-                " ReactPy requires ASGI to be enabled.",
+                "ASGI_APPLICATION is not defined, but ReactPy requires ASGI.",
                 hint="Add ASGI_APPLICATION to settings.py.",
                 id="reactpy_django.E001",
             )

From 23aa7c7cbc537da90284df4840d5df31eae677ef Mon Sep 17 00:00:00 2001
From: Archmonger <16909269+Archmonger@users.noreply.github.com>
Date: Fri, 4 Aug 2023 03:57:00 -0700
Subject: [PATCH 10/15] add channels check

---
 src/reactpy_django/checks.py | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/reactpy_django/checks.py b/src/reactpy_django/checks.py
index 5268fa1f..c77898a9 100644
--- a/src/reactpy_django/checks.py
+++ b/src/reactpy_django/checks.py
@@ -132,4 +132,14 @@ def reactpy_errors(app_configs, **kwargs):
             )
         )
 
+    # Check for dependencies
+    if "channels" not in settings.INSTALLED_APPS:
+        errors.append(
+            Error(
+                "Django Channels is not installed.",
+                hint="Add 'channels' to settings.py:INSTALLED_APPS.",
+                id="reactpy_django.E009",
+            )
+        )
+
     return errors

From d042c82bb50257ab21dd2bfff9368596798738bc Mon Sep 17 00:00:00 2001
From: Archmonger <16909269+Archmonger@users.noreply.github.com>
Date: Fri, 4 Aug 2023 04:04:14 -0700
Subject: [PATCH 11/15] move daphne warning to checks

---
 src/reactpy_django/checks.py | 18 ++++++++++++++++++
 src/reactpy_django/config.py | 13 -------------
 tests/test_app/settings.py   |  2 +-
 3 files changed, 19 insertions(+), 14 deletions(-)

diff --git a/src/reactpy_django/checks.py b/src/reactpy_django/checks.py
index c77898a9..860619a2 100644
--- a/src/reactpy_django/checks.py
+++ b/src/reactpy_django/checks.py
@@ -1,3 +1,5 @@
+import sys
+
 from django.core.checks import Error, Tags, Warning, register
 
 
@@ -39,6 +41,22 @@ def reactpy_warnings(app_configs, **kwargs):
             )
         )
 
+    # Warn if REACTPY_BACKHAUL_THREAD is set to True on Linux with Daphne
+    if (
+        sys.argv
+        and sys.argv[0].endswith("daphne")
+        and getattr(settings, "REACTPY_BACKHAUL_THREAD", True)
+        and sys.platform == "linux"
+    ):
+        warnings.append(
+            Warning(
+                "REACTPY_BACKHAUL_THREAD is enabled but you running with Daphne on Linux. "
+                "This configuration is known to be unstable.",
+                hint="Set settings.py:REACTPY_BACKHAUL_THREAD to False or use a different webserver.",
+                id="reactpy_django.W003",
+            )
+        )
+
     return warnings
 
 
diff --git a/src/reactpy_django/config.py b/src/reactpy_django/config.py
index 6d5b1130..6e362d7b 100644
--- a/src/reactpy_django/config.py
+++ b/src/reactpy_django/config.py
@@ -68,16 +68,3 @@
     "REACTPY_BACKHAUL_THREAD",
     True,
 )
-
-# Settings checks (separate from Django checks)
-if (
-    sys.platform == "linux"
-    and sys.argv
-    and sys.argv[0].endswith("daphne")
-    and REACTPY_BACKHAUL_THREAD
-):
-    _logger.warning(
-        "ReactPy is running on Linux with Daphne, but REACTPY_BACKHAUL_THREAD is set "
-        "to True. This configuration is known to be unstable. Either set "
-        "REACTPY_BACKHAUL_THREAD to False, or run ReactPy with a different ASGI server."
-    )
diff --git a/tests/test_app/settings.py b/tests/test_app/settings.py
index f1b0a69e..10cd8f6b 100644
--- a/tests/test_app/settings.py
+++ b/tests/test_app/settings.py
@@ -24,7 +24,7 @@
 # SECURITY WARNING: keep the secret key used in production secret!
 SECRET_KEY = "django-insecure-n!bd1#+7ufw5#9ipayu9k(lyu@za$c2ajbro7es(v8_7w1$=&c"
 
-# Run with debug off whenever the server is not run with `runserver`
+# Run in production mode when using a real webserver
 DEBUG = all(
     not sys.argv[0].endswith(substring)
     for substring in {"hypercorn", "uvicorn", "daphne"}

From e42047b2e32dec124396b3283c05d2f9b0368168 Mon Sep 17 00:00:00 2001
From: Archmonger <16909269+Archmonger@users.noreply.github.com>
Date: Fri, 4 Aug 2023 04:08:19 -0700
Subject: [PATCH 12/15] remove unused import

---
 src/reactpy_django/config.py | 1 -
 1 file changed, 1 deletion(-)

diff --git a/src/reactpy_django/config.py b/src/reactpy_django/config.py
index 6e362d7b..7f38f88a 100644
--- a/src/reactpy_django/config.py
+++ b/src/reactpy_django/config.py
@@ -1,7 +1,6 @@
 from __future__ import annotations
 
 import logging
-import sys
 
 from django.conf import settings
 from django.core.cache import DEFAULT_CACHE_ALIAS

From d3963f5bd7d9878cbcb2f3baaea0e8bd9e2855fa Mon Sep 17 00:00:00 2001
From: Archmonger <16909269+Archmonger@users.noreply.github.com>
Date: Fri, 4 Aug 2023 04:08:42 -0700
Subject: [PATCH 13/15] remove unused logger

---
 src/reactpy_django/config.py | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/src/reactpy_django/config.py b/src/reactpy_django/config.py
index 7f38f88a..f329b504 100644
--- a/src/reactpy_django/config.py
+++ b/src/reactpy_django/config.py
@@ -1,7 +1,5 @@
 from __future__ import annotations
 
-import logging
-
 from django.conf import settings
 from django.core.cache import DEFAULT_CACHE_ALIAS
 from django.db import DEFAULT_DB_ALIAS
@@ -15,9 +13,6 @@
 )
 from reactpy_django.utils import import_dotted_path
 
-_logger = logging.getLogger(__name__)
-
-
 # Non-configurable values
 REACTPY_DEBUG_MODE.set_current(getattr(settings, "DEBUG"))
 REACTPY_REGISTERED_COMPONENTS: dict[str, ComponentConstructor] = {}

From cece335fec35a6429554971f93ac87bed86501be Mon Sep 17 00:00:00 2001
From: Archmonger <16909269+Archmonger@users.noreply.github.com>
Date: Fri, 4 Aug 2023 17:08:12 -0700
Subject: [PATCH 14/15] Add check for client js

---
 src/reactpy_django/checks.py | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/src/reactpy_django/checks.py b/src/reactpy_django/checks.py
index 860619a2..d9b1a296 100644
--- a/src/reactpy_django/checks.py
+++ b/src/reactpy_django/checks.py
@@ -1,5 +1,6 @@
 import sys
 
+from django.contrib.staticfiles.finders import find
 from django.core.checks import Error, Tags, Warning, register
 
 
@@ -57,6 +58,16 @@ def reactpy_warnings(app_configs, **kwargs):
             )
         )
 
+    # Check if reactpy_django/client.js is available
+    if not find("reactpy_django/client.js"):
+        warnings.append(
+            Warning(
+                "ReactPy client.js could not be found within Django static files!",
+                hint="Check your Django static file configuration.",
+                id="reactpy_django.W004",
+            )
+        )
+
     return warnings
 
 

From 5ad72fca3d157c73b19985336f38ef03b08d5637 Mon Sep 17 00:00:00 2001
From: Archmonger <16909269+Archmonger@users.noreply.github.com>
Date: Fri, 4 Aug 2023 17:19:45 -0700
Subject: [PATCH 15/15] Add check for failed components

---
 src/reactpy_django/checks.py | 13 +++++++++++++
 src/reactpy_django/config.py |  1 +
 src/reactpy_django/utils.py  |  6 +++++-
 3 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/src/reactpy_django/checks.py b/src/reactpy_django/checks.py
index d9b1a296..03955950 100644
--- a/src/reactpy_django/checks.py
+++ b/src/reactpy_django/checks.py
@@ -9,6 +9,8 @@ def reactpy_warnings(app_configs, **kwargs):
     from django.conf import settings
     from django.urls import reverse
 
+    from reactpy_django.config import REACTPY_FAILED_COMPONENTS
+
     warnings = []
 
     # REACTPY_DATABASE is not an in-memory database.
@@ -68,6 +70,17 @@ def reactpy_warnings(app_configs, **kwargs):
             )
         )
 
+    # Check if any components failed to be registered
+    if REACTPY_FAILED_COMPONENTS:
+        warnings.append(
+            Warning(
+                "ReactPy failed to register the following components:\n\t+ "
+                + "\n\t+ ".join(REACTPY_FAILED_COMPONENTS),
+                hint="Check if these paths are valid, or if an exception is being raised during import.",
+                id="reactpy_django.W005",
+            )
+        )
+
     return warnings
 
 
diff --git a/src/reactpy_django/config.py b/src/reactpy_django/config.py
index f329b504..ab9bebfb 100644
--- a/src/reactpy_django/config.py
+++ b/src/reactpy_django/config.py
@@ -16,6 +16,7 @@
 # Non-configurable values
 REACTPY_DEBUG_MODE.set_current(getattr(settings, "DEBUG"))
 REACTPY_REGISTERED_COMPONENTS: dict[str, ComponentConstructor] = {}
+REACTPY_FAILED_COMPONENTS: set[str] = set()
 REACTPY_VIEW_COMPONENT_IFRAMES: dict[str, ViewComponentIframe] = {}
 
 
diff --git a/src/reactpy_django/utils.py b/src/reactpy_django/utils.py
index df8503a4..f4e0f8e6 100644
--- a/src/reactpy_django/utils.py
+++ b/src/reactpy_django/utils.py
@@ -86,7 +86,10 @@ def _register_component(dotted_path: str) -> Callable:
     """Adds a component to the mapping of registered components.
     This should only be called on startup to maintain synchronization during mulitprocessing.
     """
-    from reactpy_django.config import REACTPY_REGISTERED_COMPONENTS
+    from reactpy_django.config import (
+        REACTPY_FAILED_COMPONENTS,
+        REACTPY_REGISTERED_COMPONENTS,
+    )
 
     if dotted_path in REACTPY_REGISTERED_COMPONENTS:
         return REACTPY_REGISTERED_COMPONENTS[dotted_path]
@@ -94,6 +97,7 @@ def _register_component(dotted_path: str) -> Callable:
     try:
         REACTPY_REGISTERED_COMPONENTS[dotted_path] = import_dotted_path(dotted_path)
     except AttributeError as e:
+        REACTPY_FAILED_COMPONENTS.add(dotted_path)
         raise ComponentDoesNotExistError(
             f"Error while fetching '{dotted_path}'. {(str(e).capitalize())}."
         ) from e