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>
97 lines
3.1 KiB
Rust
97 lines
3.1 KiB
Rust
//! Byte-equivalence between the Rust target and the JS rust.mjs baseline
|
|
//! against the AFI fixture. The downstream forcing function is the wire-
|
|
//! parity drivers under `tests/rust/`; this test catches divergence
|
|
//! earlier in the cycle without needing to spin a FastAPI fixture up.
|
|
|
|
use std::collections::BTreeMap;
|
|
use std::path::PathBuf;
|
|
|
|
use mizan_codegen::config::{Config, RustKernelSpec, SourceConfig};
|
|
use mizan_codegen::emit::{CodegenTarget, EmittedFile};
|
|
use mizan_codegen::emit::rust::RustCrate;
|
|
use mizan_codegen::fetch::parse_ir_from_str;
|
|
|
|
|
|
fn load_ir() -> mizan_codegen::ir::MizanIR {
|
|
let path = PathBuf::from(env!("CARGO_MANIFEST_DIR"))
|
|
.join("tests/fixtures/afi_schema.json");
|
|
parse_ir_from_str(&std::fs::read_to_string(&path).unwrap()).unwrap()
|
|
}
|
|
|
|
|
|
fn fixture_config() -> Config {
|
|
Config {
|
|
project_id: None,
|
|
output: PathBuf::from("/tmp"),
|
|
targets: vec!["rust".to_string()],
|
|
source: SourceConfig { fastapi: None, django: None },
|
|
rust_kernel: Some(RustKernelSpec::Path {
|
|
path: "../../../frontends/mizan-rust".to_string(),
|
|
}),
|
|
rust_crate_name: Some("fixture_client".to_string()),
|
|
}
|
|
}
|
|
|
|
|
|
fn read_baseline(rel: &str) -> String {
|
|
let path = PathBuf::from(env!("CARGO_MANIFEST_DIR"))
|
|
.join("tests/fixtures/js_rust")
|
|
.join(rel);
|
|
std::fs::read_to_string(&path)
|
|
.unwrap_or_else(|e| panic!("read baseline {}: {e}", path.display()))
|
|
}
|
|
|
|
|
|
fn emit_index(files: &[EmittedFile]) -> BTreeMap<PathBuf, &str> {
|
|
files.iter().map(|f| (f.rel_path.clone(), f.content.as_str())).collect()
|
|
}
|
|
|
|
|
|
fn assert_byte_equal(rel: &str, files: &BTreeMap<PathBuf, &str>) {
|
|
let actual = files
|
|
.get(&PathBuf::from(rel))
|
|
.unwrap_or_else(|| panic!("Rust target did not produce {rel}"));
|
|
let expected = read_baseline(rel);
|
|
if *actual != expected {
|
|
for (lineno, (a, b)) in actual.lines().zip(expected.lines()).enumerate() {
|
|
if a != b {
|
|
panic!(
|
|
"{rel} diverges at line {}:\n expected: {b:?}\n actual: {a:?}",
|
|
lineno + 1,
|
|
);
|
|
}
|
|
}
|
|
panic!(
|
|
"{rel} diverges in length: actual={} expected={}\n--- actual (last 200) ---\n{}\n--- expected (last 200) ---\n{}",
|
|
actual.len(), expected.len(),
|
|
&actual[actual.len().saturating_sub(200)..],
|
|
&expected[expected.len().saturating_sub(200)..],
|
|
);
|
|
}
|
|
}
|
|
|
|
|
|
#[test]
|
|
fn rust_target_all_files_match_baseline() {
|
|
let ir = load_ir();
|
|
let files = RustCrate.emit(&ir, &fixture_config());
|
|
let index = emit_index(&files);
|
|
|
|
for rel in [
|
|
"Cargo.toml",
|
|
"src/lib.rs",
|
|
"src/types.rs",
|
|
"src/contexts/user.rs",
|
|
"src/contexts/mod.rs",
|
|
"src/functions/echo.rs",
|
|
"src/functions/whoami.rs",
|
|
"src/functions/find_user.rs",
|
|
"src/functions/rename_user.rs",
|
|
"src/functions/mod.rs",
|
|
"src/mutations/update_profile.rs",
|
|
"src/mutations/mod.rs",
|
|
] {
|
|
assert_byte_equal(rel, &index);
|
|
}
|
|
}
|