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>
81 lines
2.9 KiB
Rust
81 lines
2.9 KiB
Rust
//! Smoke test for the channels target against a synthetic fixture.
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//! The JS channels.mjs runs types through `openapi-typescript` which the
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//! Rust codegen replaces with direct interface emission; byte-equivalence
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//! against the JS baseline is intentionally not the gate. Instead this
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//! test checks structural properties of the emitted output.
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use std::collections::BTreeMap;
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use std::path::PathBuf;
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use mizan_codegen::config::{Config, SourceConfig};
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use mizan_codegen::emit::CodegenTarget;
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use mizan_codegen::emit::channels::ChannelsTarget;
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use mizan_codegen::fetch::parse_ir_from_str;
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fn fixture_config() -> Config {
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Config {
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project_id: None,
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output: PathBuf::from("/tmp"),
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targets: vec!["channels".to_string()],
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source: SourceConfig { fastapi: None, django: None },
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rust_kernel: None,
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rust_crate_name: None,
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}
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}
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#[test]
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fn channels_target_emits_expected_files() {
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let raw = std::fs::read_to_string(
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PathBuf::from(env!("CARGO_MANIFEST_DIR")).join("tests/fixtures/channels_schema.json"),
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).unwrap();
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let ir = parse_ir_from_str(&raw).unwrap();
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let files = ChannelsTarget.emit(&ir, &fixture_config());
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assert_eq!(files.len(), 2, "channels target emits 2 files when channels present");
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let by_path: BTreeMap<PathBuf, &str> =
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files.iter().map(|f| (f.rel_path.clone(), f.content.as_str())).collect();
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let ts = by_path.get(&PathBuf::from("channels.ts"))
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.expect("channels.ts emitted");
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for expected in [
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"export interface ChatChannelParams",
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"export interface ChatReactMessage",
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"export interface ChatDjangoMessage",
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"export interface NotificationsDjangoMessage",
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"export const CHANNELS = {",
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"chat: {",
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"notifications: {",
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"hasParams: true",
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"hasParams: false",
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] {
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assert!(ts.contains(expected), "channels.ts must contain {expected:?}");
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}
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let hooks = by_path.get(&PathBuf::from("channels.hooks.tsx"))
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.expect("channels.hooks.tsx emitted");
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for expected in [
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"import { useChannel, type ChannelSubscription } from 'mizan/channels'",
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"export function useChatChannel(params: ChatChannelParams)",
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"export function useNotificationsChannel()",
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"ChannelSubscription<ChatChannelParams, ChatDjangoMessage, ChatReactMessage>",
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"ChannelSubscription<Record<string, never>, NotificationsDjangoMessage, never>",
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] {
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assert!(hooks.contains(expected), "channels.hooks.tsx must contain {expected:?}");
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}
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}
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#[test]
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fn channels_target_emits_nothing_when_empty() {
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// AFI fixture has no channels — target should produce zero files.
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let raw = std::fs::read_to_string(
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PathBuf::from(env!("CARGO_MANIFEST_DIR")).join("tests/fixtures/afi_schema.json"),
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).unwrap();
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let ir = parse_ir_from_str(&raw).unwrap();
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let files = ChannelsTarget.emit(&ir, &fixture_config());
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assert!(files.is_empty(), "no channels → no files");
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}
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