izana-django

Django backend adapter for the Izana protocol. One decorator on a server function. Typed React client generated. Invalidation automatic.

Install

uv add "django-izana[channels]"

The distribution is django-izana; the importable package is izana.

Setup

# settings.py
INSTALLED_APPS = ["izana", "myapp", ...]

IZANA_CACHE_SECRET   = "..."   # 32-byte HMAC signing key
IZANA_CACHE_REDIS_URL = "redis://localhost:6379/0"
IZANA_MWT_SECRET     = "..."   # MWT signing key (separate from cache + JWT)

# urls.py
from django.urls import include, path

urlpatterns = [
    path("api/izana/", include("izana.urls")),
]

# asgi.py — for WebSocket / Channels support
from django.core.asgi import get_asgi_application
from izana import wrap_asgi

application = wrap_asgi(get_asgi_application())

Define server functions

# myapp/clients.py
from izana.client import client
from izana.setup import register
from pydantic import BaseModel


class EchoOutput(BaseModel):
    message: str


@client
def echo(request, text: str) -> EchoOutput:
    return EchoOutput(message=text)


register(echo, "echo")

Auto-discover clients.py modules from each Django app:

# myapp/apps.py
from django.apps import AppConfig


class MyAppConfig(AppConfig):
    name = "myapp"

    def ready(self) -> None:
        from izana.setup import izana_clients
        izana_clients("myapp")  # imports myapp/clients.py — triggers @client side effects

@client parameters

@client                              # plain RPC function
@client(context="global")            # singleton context — fetched once, SSR-hydrated
@client(context="user")              # named context — fetched per provider mount
@client(affects="user")              # mutation — invalidates the user context
@client(affects=["user", "cart"])    # mutation — invalidates several contexts
@client(merge="cart")                # mutation — its result splices into the cart context's matching slot
@client(websocket=True)              # WebSocket transport (requires channels)
@client(auth=True)                   # requires authentication
@client(auth="staff")                # requires is_staff
@client(auth="superuser")            # requires is_superuser
@client(auth=lambda req: ...)        # custom predicate
@client(route="/profile/<id>/")      # view-path function (returns HttpResponse)
@client(rev=2)                       # cache revision (busts on bump)

Forms

Django Forms become server functions + typed React hooks with Zod validation:

from django import forms
from izana.forms import izanaFormMixin, izanaFormMeta


class ContactForm(izanaFormMixin, forms.Form):
    izana = izanaFormMeta(name="contact", title="Contact Us", submit_label="Send")

    name    = forms.CharField()
    email   = forms.EmailField()
    message = forms.CharField(widget=forms.Textarea)

    def on_submit_success(self, request):
        send_email(self.cleaned_data)
        return {"sent": True}

Auto-registers contact.schema, contact.validate, contact.submit. The codegen doesn't emit a hook for them; the frontend drives the three through useIzanaFormCore({ name: "contact" }) from @eralyr/izana-react, which binds to that package's IzanaProvider rather than the generated IzanaContext kernel.

Auth-provider forms (django-allauth login, signup, MFA, WebAuthn) live in the dedicated izana-allauth repository, built on this mixin.

Channels

WebSocket-native RPC via a flag flip. The message slots are named from the client's point of view: ClientMessage travels client → server, ServerMessage travels server → client. Declare only the directions the channel uses.

from pydantic import BaseModel
from izana.channels import Channel


class ChatChannel(Channel):
    class Params(BaseModel):
        room: str

    class ClientMessage(BaseModel):
        text: str

    class ServerMessage(BaseModel):
        text: str
        user: str

    def authorize(self, params):
        return self.user.is_authenticated

    def group(self, params):
        return f"chat_{params.room}"

    def receive(self, params, msg):
        return self.ServerMessage(text=msg.text, user=self.user.email)

Frontend gets useChatChannel({ room }). authorize, group, and receive may be plain def and use the ORM freely — the consumer runs them off the event loop, the same way it dispatches RPC — or async def, which it awaits.

Server code outside a subscription broadcasts with push(). It builds a bare channel instance (no user), so group() must be derivable from params alone:

await ChatChannel.push(room="general", message=ChatChannel.ServerMessage(...))

Generate the frontend

The codegen is the izana-generate Rust binary (source at protocol/izana-codegen/; protocol/izana-generate/ is a thin npm launcher that dispatches to the platform binary). From your frontend project, point a izana.toml at the Django backend and run the CLI:

# frontend/izana.toml
output = "src/api"
targets = ["react"]

[source.django]
manage_path = "../backend/manage.py"
command = ["uv", "run", "python"]    # optional — defaults to ["python"]

[source.django.env]
PYTHONPATH = "../backend"
DJANGO_SETTINGS_MODULE = "myproject.settings"

izana-generate --config izana.toml

The codegen drives Django's management command (export_izana_ir) under the hood, parses the emitted KDL IR, then emits Stage 1 (typed callXxx/fetchXxx over the runtime kernel) + Stage 2 (<IzanaContext> provider, per-context providers, use{Hook}() hooks) into src/api/.

// app.tsx
import { IzanaContext } from "./api"

export default function App({ children }) {
    return <IzanaContext baseUrl="/api/izana">{children}</IzanaContext>
}

// any component
import { useEcho, useCurrentUser } from "./api"

const echo = useEcho()
echo.mutate({ text: "hi" }).then(r => console.log(r.message))

const user = useCurrentUser()  // global context — auto-fetched, auto-refreshed on mutation

Running tests

uv sync --extra dev --extra channels
uv run pytest

Architecture

izana-django is one of two reference backend adapters (the other is backends/izana-fastapi). Both implement the same Izana protocol on top of the shared cores/izana-python core (@client, registry, MWT, HMAC cache keys). See docs/AFI_ARCHITECTURE.md.