Ryth Azhur
43bcf3f26f
The Mizan codegen substrate moves off JavaScript template-literal emission
onto a compiled Rust binary that consumes the same OpenAPI + x-mizan-* IR
the JS substrate consumed. Three structural wins fall out of one move:
1. Moat closes. The codegen logic (how `affects` becomes auto-invalidation,
how named contexts collapse onto bundled fetches, how the registry-to-
Provider mapping is shaped) ships compiled instead of as source bytes
in every consumer's node_modules.
2. Pattern F (lines.push append-walls) becomes structurally unauthorable.
The emit substrate is askama templates in templates/<target>/*.j2 —
actual target-language files with {{ ... }} substitution markers,
syntax-highlighted natively, type-checked against the render context
structs at compile time. The Rust emit modules build typed render
contexts and call .render(); no string-builder surface exists.
3. OpenAPI `default`-bearing fields now emit as non-optional in TS / Python
/ Rust — the server always populates them, so consumer code reads them
without nullable checks. Surfaced by Blazr's typecheck on regeneration.
Layout:
frontends/mizan-rust/ — Rust port of @mizan/base; #[cfg(feature="pyo3")]
exposes PyMizanClient for the Python target.
protocol/mizan-codegen/ — codegen binary source + askama templates.
protocol/mizan-generate/ — npm-package shim. bin/launcher.mjs dispatches
to the platform-appropriate prebuilt binary.
Old generator/ JS tree deleted.
tests/rust/ — wire-parity drivers. drive_kernel exercises
raw client.call() / fetch_context(); drive_emitted
exercises the typed crate the codegen emits.
tests/afi/afi_codegen_app.py — codegen entrypoint module (imports + registers).
backends/mizan-fastapi/.../schema.py — adds outputNullable so the Rust
codegen can wrap T | None responses in Option<T>.
Verification:
- 20 mizan-codegen tests green (IR deserialization, byte-equivalent
parity vs JS baseline for stage1/rust/python/react/vue/svelte,
structural test for channels).
- tests/rust/run_wire_parity.py — 12/12 probes green via the Rust binary
driving the FastAPI fixture end-to-end.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
66 lines
2.4 KiB
Django/Jinja
66 lines
2.4 KiB
Django/Jinja
// AUTO-GENERATED by mizan — do not edit
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import { ref, computed, onMounted, onUnmounted, onServerPrefetch, type ComputedRef } from 'vue'
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import { registerContext, type ContextState } from '@mizan/base'
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{% if !stage1_imports.is_empty() -%}
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import { {{ stage1_imports|join(", ") }} } from '../index'
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{% endif -%}
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{% for ctx in contexts -%}
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export function use{{ ctx.pascal }}Context({% if ctx.has_params %}params: {{ ctx.pascal }}ContextParams{% endif %}) {
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const state = ref<ContextState<{{ ctx.pascal }}ContextData>>({ data: null, status: 'idle', error: null })
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let handle: ReturnType<typeof registerContext> | null = null
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onMounted(() => {
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handle = registerContext('{{ ctx.name }}', {{ ctx.params_arg }}, () => fetch{{ ctx.pascal }}Context({{ ctx.params_arg }}))
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handle.subscribe(() => { state.value = handle!.getState() })
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handle.refetch()
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})
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onServerPrefetch(async () => {
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handle = registerContext('{{ ctx.name }}', {{ ctx.params_arg }}, () => fetch{{ ctx.pascal }}Context({{ ctx.params_arg }}))
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await handle.refetch()
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state.value = handle.getState()
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})
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onUnmounted(() => { handle?.unregister() })
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return {
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state,
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{%- for fn in ctx.fns %}
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{{ fn.camel_name }}: computed(() => state.value.data?.{{ fn.name }} ?? null) as ComputedRef<{{ fn.output_type }} | null>,
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{%- endfor %}
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loading: computed(() => state.value.status === 'loading'),
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error: computed(() => state.value.error),
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}
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}
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{% endfor -%}
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{% for call in calls -%}
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export function use{{ call.pascal }}() {
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const isPending = ref(false)
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const error = ref<Error | null>(null)
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{%- if call.has_input %}
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async function mutate(args: Parameters<typeof call{{ call.pascal }}>[0]) {
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isPending.value = true; error.value = null
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try { return await call{{ call.pascal }}(args) }
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catch (e) { error.value = e as Error; throw e }
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finally { isPending.value = false }
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}
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{%- else %}
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async function mutate() {
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isPending.value = true; error.value = null
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try { return await call{{ call.pascal }}() }
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catch (e) { error.value = e as Error; throw e }
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finally { isPending.value = false }
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}
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{%- endif %}
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return { mutate, isPending, error }
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}
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{% endfor -%}
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export type { ContextState } from '@mizan/base'
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export { configure, initSession, MizanError } from '@mizan/base'
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