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Showing content from https://github.com/fabiocaccamo/django-maintenance-mode below:

fabiocaccamo/django-maintenance-mode: :construction: shows a 503 error page when maintenance-mode is on.

django-maintenance-mode shows a 503 error page when maintenance-mode is on.

It works at application level, so your django instance should be up.

It doesn't use database and doesn't prevent database access.

Run pip install django-maintenance-mode or download django-maintenance-mode and add the maintenance_mode package to your project
Add maintenance_mode to settings.INSTALLED_APPS before custom applications
Add maintenance_mode.middleware.MaintenanceModeMiddleware to settings.MIDDLEWARE as last middleware
Add your custom templates/503.html file
Restart your application server

All these settings are optional, if not defined in settings.py the default values (listed below) will be used.

# if True the maintenance-mode will be activated
MAINTENANCE_MODE = None

# by default, to get/set the state value a local file backend is used
# if you want to use the db or cache, you can create a custom backend
# custom backends must extend 'maintenance_mode.backends.AbstractStateBackend' class
# and implement get_value(self) and set_value(self, val) methods
MAINTENANCE_MODE_STATE_BACKEND = "maintenance_mode.backends.LocalFileBackend"

# alternatively it is possible to use the default storage backend
MAINTENANCE_MODE_STATE_BACKEND = "maintenance_mode.backends.DefaultStorageBackend"

# alternatively it is possible to use the static storage backend
# make sure that STATIC_ROOT and STATIC_URL are also set
MAINTENANCE_MODE_STATE_BACKEND = "maintenance_mode.backends.StaticStorageBackend"

# alternatively it is possible to use the cache backend
# you can use a custom cache backend by adding a `maintenance_mode` entry to `settings.CACHES`,
# otherwise the default cache backend will be used.
MAINTENANCE_MODE_STATE_BACKEND = "maintenance_mode.backends.CacheBackend"

# the fallback value that backends will return in case of failure
# (actually this is only used by "maintenance_mode.backends.CacheBackend")
MAINTENANCE_MODE_STATE_BACKEND_FALLBACK_VALUE = False

# by default, a file named "maintenance_mode_state.txt" will be created in the settings.py directory
# you can customize the state file path in case the default one is not writable
MAINTENANCE_MODE_STATE_FILE_PATH = "maintenance_mode_state.txt"

# if True admin site will not be affected by the maintenance-mode page
MAINTENANCE_MODE_IGNORE_ADMIN_SITE = False

# if True anonymous users will not see the maintenance-mode page
MAINTENANCE_MODE_IGNORE_ANONYMOUS_USER = False

# if True authenticated users will not see the maintenance-mode page
MAINTENANCE_MODE_IGNORE_AUTHENTICATED_USER = False

# if True the staff will not see the maintenance-mode page
MAINTENANCE_MODE_IGNORE_STAFF = False

# if True the superuser will not see the maintenance-mode page
MAINTENANCE_MODE_IGNORE_SUPERUSER = False

# list of ip-addresses that will not be affected by the maintenance-mode
# ip-addresses will be used to compile regular expressions objects
MAINTENANCE_MODE_IGNORE_IP_ADDRESSES = ()

# the path of the function that will return the client IP address given the request object -> 'myapp.mymodule.myfunction'
# the default function ('maintenance_mode.utils.get_client_ip_address') returns request.META['REMOTE_ADDR']
# in some cases the default function returns None, to avoid this scenario just use 'django-ipware'
MAINTENANCE_MODE_GET_CLIENT_IP_ADDRESS = None

Retrieve user's real IP address using django-ipware:

MAINTENANCE_MODE_GET_CLIENT_IP_ADDRESS = "ipware.ip.get_ip"

# the path of the function that will return the response context -> 'myapp.mymodule.myfunction'
MAINTENANCE_MODE_GET_CONTEXT = None

# list of urls that will not be affected by the maintenance-mode
# urls will be used to compile regular expressions objects
MAINTENANCE_MODE_IGNORE_URLS = ()

# if True the maintenance mode will not return 503 response while running tests
# useful for running tests while maintenance mode is on, before opening the site to public use
MAINTENANCE_MODE_IGNORE_TESTS = False

# if True authenticated users will be logged out from their current session
MAINTENANCE_MODE_LOGOUT_AUTHENTICATED_USER = False

# the absolute url where users will be redirected to during maintenance-mode
MAINTENANCE_MODE_REDIRECT_URL = None

# the type of the response returned during maintenance mode, can be either "html" or "json"
MAINTENANCE_MODE_RESPONSE_TYPE = "html"

# the template that will be shown by the maintenance-mode page
MAINTENANCE_MODE_TEMPLATE = "503.html"

# the HTTP status code to send
MAINTENANCE_MODE_STATUS_CODE = 503

# the value in seconds of the Retry-After header during maintenance-mode
MAINTENANCE_MODE_RETRY_AFTER = 3600 # 1 hour

Add maintenance_mode.context_processors.maintenance_mode to your context_processors list in settings.py if you want to access the maintenance_mode status in your templates.

TEMPLATES = [
    {
        # ...
        "OPTIONS": {
            "context_processors": [
                # ...
                "maintenance_mode.context_processors.maintenance_mode",
                # ...
            ],
        },
        # ...
    },
]

You can disable emailing 503 errors to admins while maintenance mode is enabled:

LOGGING = {
    "filters": {
        "require_not_maintenance_mode_503": {
            "()": "maintenance_mode.logging.RequireNotMaintenanceMode503",
        },
        ...
    },
    "handlers": {
        ...
    },
    ...
}

You can force a block of code execution to run under maintenance mode or not using context managers:

from maintenance_mode.core import maintenance_mode_off, maintenance_mode_on

with maintenance_mode_on():
    # do stuff
    pass

with maintenance_mode_off():
    # do stuff
    pass

Add maintenance_mode.urls to urls.py if you want superusers able to set maintenance_mode using urls.

urlpatterns = [
    # ...
    re_path(r"^maintenance-mode/", include("maintenance_mode.urls")),
    # ...
]

You can force maintenance mode on/off at view level using view decorators:

from maintenance_mode.decorators import force_maintenance_mode_off, force_maintenance_mode_on

@force_maintenance_mode_off
def my_view_a(request):
    # never return 503 response
    pass

@force_maintenance_mode_on
def my_view_b(request):
    # always return 503 response
    pass

from maintenance_mode.decorators import force_maintenance_mode_off, force_maintenance_mode_on

urlpatterns = [
    # never return 503 response
    path("", force_maintenance_mode_off(YourView.as_view()), name="my_view"),

    # always return 503 response
    path("", force_maintenance_mode_on(YourView.as_view()), name="my_view"),
]

from maintenance_mode.core import get_maintenance_mode, set_maintenance_mode

set_maintenance_mode(True)

if get_maintenance_mode():
    set_maintenance_mode(False)

from django.core.management import call_command
from django.core.management.base import BaseCommand


class Command(BaseCommand):

    def handle(self, *args, **options):

        call_command("maintenance_mode", "on")

        # call your command(s)

        call_command("maintenance_mode", "off")

{% if maintenance_mode %}
<!-- html -->
{% endif %}

Run python manage.py maintenance_mode <on|off>

(This is not Heroku-friendly because any execution of heroku run manage.py will be run on a separate worker dyno, not the web one. Therefore the state-file is set but on the wrong machine. You should use a custom MAINTENANCE_MODE_STATE_BACKEND.)

Superusers can change maintenance-mode using the following urls:

/maintenance-mode/off/

/maintenance-mode/on/

# clone repository
git clone https://github.com/fabiocaccamo/django-maintenance-mode.git && cd django-maintenance-mode

# create virtualenv and activate it
python -m venv venv && . venv/bin/activate

# upgrade pip
python -m pip install --upgrade pip

# install requirements
pip install -r requirements.txt -r requirements-test.txt

# install pre-commit to run formatters and linters
pre-commit install --install-hooks

# run tests
tox
# or
python runtests.py
# or
python -m django test --settings "tests.settings"

Released under MIT License.

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