mizan/README.md

Mizan

Mizan is an Application Framework Interface (AFI). A single @client decorator on a server function generates a typed frontend client; cache invalidation and caching are handled by the protocol.

from mizan import client, ReactContext

UserContext = ReactContext('user')

# Context function — bundled into GET /api/mizan/ctx/user/
@client(context=UserContext)
def user_profile(request, user_id: int) -> UserShape:
    return UserShape.query(lambda qs: qs.filter(pk=user_id))[0]

# Mutation — invalidation scoped automatically by matching param name
@client(affects=UserContext)
def update_profile(request, user_id: int, name: str) -> dict:
    ...

Adapters exist for Django, FastAPI, Rust/Axum, Tauri, and TypeScript. Django is the reference implementation; per-adapter support is inventoried below.

Status: Mizan is not production-tested. It passes its own test suites but has not been run in a production deployment. Treat it as pre-release.

Documentation

• docs/ — architecture references: AFI, SSR, cache keying, MWT, PSR vs. Edge
• ROADMAP.md · ISSUES.md — planned work and known gaps

Backend adapters

Every adapter implements the same AFI wire protocol. The matrix below is generated from the conformance probes in tests/afi/ by make parity-table — it is output, not prose. A cell goes ✅ only when that adapter wires the capability into its own dispatch surface; it cannot be set to "supported" or "Django-only" by editing this file (a hand-edit fails python tests/afi/parity_table.py --check in CI, the same forcing function the codegen byte-parity tests use).

Every capability in the matrix is AFI-common — each adapter owes a binding, and a ❌ is a gap on the owed-work board, never a "this framework doesn't do that." The line between AFI-common and genuinely backend-bound lives in tests/afi/manifest.py: what sits outside the matrix by design is the allauth integration (a Django-ecosystem package) and the per-stack bindings of common capabilities (django-readers is Django's Shapes binding; Django Forms is Django's Forms binding) — the capability is common; the binding is not.

Legend: ✅ wired · ◑ partial (declared/stubbed) · ❌ gap (AFI-common, owed) · — not applicable to this adapter's transport

Every capability below is AFI-common: each adapter owes a binding, and a ❌ is a gap on the owed-work board (tests/afi/), never a category. Backend-specific bindings of common capabilities (django-readers for Shapes, Django Forms for Forms) and genuinely Django-ecosystem features (allauth) are out of this matrix by design — see tests/afi/manifest.py for the line.

Protocol core

Capability	Django	FastAPI	Rust / Axum	Tauri	TypeScript
RPC call dispatch ({result, invalidate})	✅	✅	✅	✅	✅
Named-context bundle fetch	✅	✅	✅	✅	✅
Invalidation — JSON body	✅	✅	✅	✅	✅
Invalidation — X-Mizan-Invalidate header	✅	✅	✅	—	✅
Invalidation auto-scoping (three-tier)	✅	✅	✅	✅	✅
Function discovery / registration	✅	✅	✅	✅	✅
Codegen IR export (KDL)	✅	✅	✅	✅	✅
File uploads (Upload type)	✅	✅	✅	✅	✅

Edge, cache & enforcement

Capability	Django	FastAPI	Rust / Axum	Tauri	TypeScript
Auth-guard enforcement (auth=… rejects)	✅	✅	✅	✅	✅
Origin-side HMAC cache	✅	✅	✅	✅	✅
Edge manifest export	✅	✅	✅	—	✅
PSR (render_strategy in manifest)	✅	✅	✅	—	✅
Session / CSRF init endpoint	✅	✅	✅	—	✅

Extension points

Capability	Django	FastAPI	Rust / Axum	Tauri	TypeScript
WebSocket transport (websocket= declared)	✅	✅	✅	✅	✅
SSR bridge (subprocess renderer)	✅	✅	✅	✅	✅
JWT auth (access / refresh)	✅	✅	✅	✅	✅
MWT (edge identity token)	✅	✅	✅	—	✅
Typed query projection (Shapes)	✅	✅	✅	✅	✅
Forms (schema / validate / submit)	✅	✅	✅	✅	✅

Notes

• Invalidation — X-Mizan-Invalidate header — The header channel is co-equal with the body channel in the spec. IPC transports carry invalidation in the response envelope instead.
• Edge manifest export — The manifest configures an HTTP/CDN edge; a desktop IPC shell has no edge.
• MWT (edge identity token) — MWT exists to key an edge cache; without an edge there is nothing to key.
• Typed query projection (Shapes) — The capability is AFI-common; the binding is per-ORM (django-readers on Django, the project's ORM elsewhere).
• Forms (schema / validate / submit) — The capability is AFI-common; the binding is per-framework (Django Forms on Django, Pydantic-or-equivalent elsewhere).

Conformance

Adapter parity is gated by the AFI conformance suite in tests/afi/, at two layers:

• IR-shape parity (test_codegen_parity.py) — Django, FastAPI, and the Rust adapter emit byte-identical KDL for the same registered fixture. The IR is the contract; the language that wrote the backend is irrelevant to the codegen-facing artifact.
• Capability parity (test_capability_parity.py) — every (capability, applicable adapter) pair declared in manifest.py is probed for its actual wiring (probes.py). A gap is a red test that names the owed binding, not a footnote. The suite is intentionally red wherever a capability is unwired: that redness is the owed-work board, itemized and loud, and a gap turns green by being wired, never by being described. This is the per-capability gate the roadmap previously deferred.

The generated table above is rendered from the capability layer, and the --check diff keeps the README honest to the probes on every CI run.

License

Mizan is licensed under the Elastic License 2.0 (SPDX: Elastic-2.0). You may use, copy, modify, and distribute it freely, including in commercial products you build on top of it. You may not provide Mizan to third parties as a hosted or managed service that exposes a substantial set of its features.