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>
76 lines
2.2 KiB
Rust
76 lines
2.2 KiB
Rust
//! Byte-equivalence test for the Python target against the JS baseline.
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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, EmittedFile};
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use mizan_codegen::emit::python::PythonClient;
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use mizan_codegen::fetch::parse_ir_from_str;
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fn load_ir() -> mizan_codegen::ir::MizanIR {
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let path = PathBuf::from(env!("CARGO_MANIFEST_DIR")).join("tests/fixtures/afi_schema.json");
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parse_ir_from_str(&std::fs::read_to_string(&path).unwrap()).unwrap()
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}
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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!["python".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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fn read_baseline(rel: &str) -> String {
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let path = PathBuf::from(env!("CARGO_MANIFEST_DIR"))
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.join("tests/fixtures/js_python")
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.join(rel);
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std::fs::read_to_string(&path)
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.unwrap_or_else(|e| panic!("read baseline {}: {e}", path.display()))
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}
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fn emit_index(files: &[EmittedFile]) -> BTreeMap<PathBuf, &str> {
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files.iter().map(|f| (f.rel_path.clone(), f.content.as_str())).collect()
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}
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fn assert_byte_equal(rel: &str, files: &BTreeMap<PathBuf, &str>) {
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let actual = files
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.get(&PathBuf::from(rel))
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.unwrap_or_else(|| panic!("Python target did not produce {rel}"));
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let expected = read_baseline(rel);
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if *actual != expected {
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for (lineno, (a, b)) in actual.lines().zip(expected.lines()).enumerate() {
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if a != b {
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panic!(
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"{rel} diverges at line {}:\n expected: {b:?}\n actual: {a:?}",
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lineno + 1,
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);
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}
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}
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panic!(
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"{rel} diverges in length: actual={} expected={}",
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actual.len(), expected.len(),
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);
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}
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}
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#[test]
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fn python_target_all_files_match_baseline() {
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let ir = load_ir();
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let files = PythonClient.emit(&ir, &fixture_config());
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let index = emit_index(&files);
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for rel in ["types.py", "client.py", "__init__.py"] {
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assert_byte_equal(rel, &index);
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}
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}
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