Ryth Azhur
19ce4d4a2a
Re-stating the architectural intent that got silently swapped to "JSON
schema" during the doc-restoration commit (6eca514). The original
AFI_ARCHITECTURE positioned KDL as the LLVM-IR-equivalent of the
system; I read the stale-package-name note at the bottom as
invalidating the whole architecture description and substituted
JSON-schema references thinking that was the more-current intent.
That conflated implementation drift (mizan-ast/mizan-schema package
names) with substrate intent (KDL is the IR). The packages had
drifted; the IR target had not. Restoring the section.
Frames KDL-as-IR explicitly as forward-direction. The current
OpenAPI/JSON-Schema codegen path is transitional — it's the layered
indirection where adapter divergence lives (AFI conformance suite
demonstrates this). Real KDL implementation lives in a forthcoming
mizan-schema package; today's path is sediment around the eventual
substrate.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
89 lines
3.4 KiB
Markdown
89 lines
3.4 KiB
Markdown
# AFI Architecture
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Mizan is an **Application Framework Interface (AFI)** — the
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server-client unification layer.
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## Package layout
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Tree organized by role.
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```
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backends/ server protocol adapters
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mizan-django/ Django adapter
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mizan-ts/ TypeScript adapter (proves the protocol is language-agnostic)
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frontends/ client kernel + per-framework adapters
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mizan-base/ framework-agnostic kernel; owns data, status, error; adapters subscribe
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mizan-react/ React contexts + hooks over the kernel
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mizan-vue/ Vue composables over the kernel
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mizan-svelte/ Svelte stores/runes over the kernel
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cores/ shared language-level primitives (mizan-python forthcoming)
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workers/ runtime workers / bridges
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mizan-ssr/ Bun subprocess used by the Django template backend
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```
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## Two orthogonal products
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- **RPC** — typed client generation via codegen
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- **SSR** — server rendering via the Bun bridge
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Independent and composable. Either ships standalone; together they
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compose.
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## Kernel model
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The client kernel (`mizan-base`) is the one hard thing. Per-
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framework adapters are thin idiomatic wrappers around it. Codegen
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emits typed bindings against the framework adapter's surface, not
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against the raw kernel — so a React developer gets `useEcho()` and
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`<MizanContext>`, a Vue developer gets `useEcho()` composables, a
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Svelte developer gets readable stores. Same kernel underneath.
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## KDL is the IR
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The Mizan IR is **KDL** — the LLVM-IR-equivalent of the system. Every
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backend adapter produces KDL describing its registered functions,
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contexts, types, and invalidation graph. Every codegen target consumes
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KDL. KDL is the contract; everything else (REST envelopes, OpenAPI
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documents, framework idioms) is sediment around it.
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The IR must be validated against multiple adapters before it is
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considered stable. Single-adapter validation hides assumptions —
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divergence between adapters is what the IR exists to prevent.
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Forward-direction primitives:
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- `cores/mizan-python` builds the IR from registered functions
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(`build_ir()` walks `mizan_core.registry`, emits KDL)
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- A `mizan-schema` package (forthcoming) holds the canonical KDL
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grammar / type system definition that every adapter targets
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- Codegen reads KDL directly — no OpenAPI envelope, no
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`openapi-typescript`, no per-backend converter divergence
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- Edge manifest, MWT claims, and other protocol artifacts all derive
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from the same KDL
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**Current implementation is transitional.** Today the codegen consumes
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OpenAPI 3.0 (`x-mizan-functions` + `x-mizan-contexts` extensions over
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Pydantic→JSON-Schema), produced via Django Ninja or FastAPI's native
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generator. That layered indirection is what introduces adapter
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divergence (see the AFI conformance suite). KDL-as-IR collapses it.
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## Launch surface
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Python (Django) + React. Vue and Svelte ship as v1 alongside React.
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TypeScript backend (`mizan-ts`) proves the protocol is portable.
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## Why the AFI shape
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Quadratic ecosystem growth (N server adapters × M client adapters)
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collapses to linear (one adapter per stack) when both sides
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communicate through a shared protocol.
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## Invariants
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- All cross-package communication goes through the protocol. No
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direct cross-package dependencies.
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- New adapters land as new packages, not as modifications to existing
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ones.
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- Framework adapters wrap the kernel in framework idioms — they
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don't bypass it. Codegen targets the adapter, not the raw kernel.
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