Ryth Azhur
45bde51166
Adds first-class Rust-backed Mizan to sit alongside mizan-django and
mizan-fastapi. A Rust dev writes:
#[derive(Mizan, Serialize, Deserialize)]
pub struct ProfileOutput { pub user_id: i64, pub name: String }
#[mizan::context("user")]
pub struct UserCtx;
#[mizan::client(context = UserCtx)]
pub async fn user_profile(_req: &RequestHandle<'_>, user_id: i64) -> ProfileOutput { ... }
…and gets byte-identical KDL to the Python emitters, served over the
same wire protocol the React / Rust / Vue / Svelte kernels speak.
New crates:
- cores/mizan-rust/ (Cargo: mizan-core) — IR types, KDL emitter, traits, registry,
runtime (compute_invalidation / compute_merges
ported from mizan-fastapi), graph_check with
structural type-matching
- cores/mizan-rust-macros/ (Cargo: mizan-macros) — #[derive(Mizan)], #[mizan::context],
#[mizan::client] proc macros
- backends/mizan-rust-axum/ (Cargo: mizan-axum) — axum HTTP adapter: /session/, /call/, /ctx/:name/
- tests/afi/rust_app/ — AFI fixture port + server / export-ir binaries
Substrate-shape moves required by cross-language equivalence:
- IR canonicalization: functions / contexts / context-members / shared-by
now sort alphabetically in both Python and Rust emitters. The IR is a
contract; linkme doesn't preserve declaration order, so canonical sort
is the only stable mapping. afi_ir.kdl + per-target baselines regenerated.
- MizanType::TYPE_NAME is a const (with a default type_name() reader) so
it's usable in linkme TypeEntry static initializers.
- Tree-shaken type registry: #[derive(Mizan)] only emits the trait impl;
the #[mizan::client] macro registers canonical-named entries from
fn signatures, including Vec<T> element types for ref resolution.
- Merge resolution is structural (NamedType shape comparison) rather than
by name — matches the Python types_match_for_merge semantics.
Three-way forcing functions:
- tests/afi/test_codegen_parity.py — Django ≡ FastAPI ≡ Rust on KDL bytes (3 pass)
- tests/rust/run_wire_parity.py — 12/12 probes against FastAPI + Rust (EXIT=0)
Incidental fixes surfaced by the new tests:
- Stale `from .registry import validate_registry` import removed from
mizan-django/setup/discovery.py (referenced a function that no longer
exists; was masking codegen-parity).
- BASE_DIR added to tests/afi/django_app/project/settings.py.
- /session/ endpoint added to mizan-fastapi for protocol-shaped readiness
probe parity (wire-parity harness now polls /api/mizan/session/ on both
backends rather than FastAPI's /openapi.json).
- Root .gitignore picks up Rust target/ across the tree so new crates
don't need per-crate gitignore.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
117 lines
3.3 KiB
Python
117 lines
3.3 KiB
Python
"""
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AFI conformance — same fixture, same Mizan IR (KDL), all three adapters.
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Gates that mizan-django, mizan-fastapi, and the Rust mizan-axum backend
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emit byte-equivalent KDL for the same registered functions. The IR is the
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contract; whatever language wrote the backend, the wire/codegen-facing
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artifact is identical.
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Substrate-level gate, not e2e. Catches adapter symmetry problems —
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type-introspection divergence, ordering non-determinism — across all
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backends in one place.
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"""
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from __future__ import annotations
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import os
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import subprocess
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import sys
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from pathlib import Path
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import pytest
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HERE = Path(__file__).parent
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DJANGO_MANAGE = HERE / "django_app" / "manage.py"
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RUST_APP_DIR = HERE / "rust_app"
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def _fetch_django_ir() -> str:
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"""Spawn Django's management command and parse stdout as KDL."""
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result = subprocess.run(
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[sys.executable, str(DJANGO_MANAGE), "export_mizan_ir"],
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capture_output=True,
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text=True,
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check=False,
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env={**os.environ, "PYTHONDONTWRITEBYTECODE": "1"},
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)
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if result.returncode != 0:
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pytest.fail(
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f"export_mizan_ir failed:\nstdout:\n{result.stdout}\nstderr:\n{result.stderr}",
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)
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return result.stdout
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def _fetch_fastapi_ir() -> str:
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"""Build the FastAPI app inline (fresh registry) and call build_ir()."""
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sys.path.insert(0, str(HERE))
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try:
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from mizan_core.registry import clear_registry
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from mizan_core.ir import build_ir
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from fastapi_app import make_app
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clear_registry()
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make_app()
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return build_ir()
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finally:
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sys.path.remove(str(HERE))
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def _fetch_rust_ir() -> str:
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"""Spawn the Rust `export-ir` bin and capture stdout."""
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result = subprocess.run(
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[
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"cargo", "run",
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"--quiet", "--release",
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"--manifest-path", str(RUST_APP_DIR / "Cargo.toml"),
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"--bin", "export-ir",
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],
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capture_output=True,
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text=True,
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check=False,
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)
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if result.returncode != 0:
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pytest.fail(
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f"Rust export-ir failed:\nstdout:\n{result.stdout}\nstderr:\n{result.stderr}",
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)
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return result.stdout
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@pytest.fixture(scope="module")
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def fastapi_ir() -> str:
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return _fetch_fastapi_ir()
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@pytest.fixture(scope="module")
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def rust_ir() -> str:
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return _fetch_rust_ir()
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@pytest.fixture(scope="module")
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def django_ir() -> str:
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return _fetch_django_ir()
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def test_fastapi_matches_rust(fastapi_ir: str, rust_ir: str) -> None:
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"""FastAPI ≡ Rust. The Mizan IR is the contract across languages."""
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assert fastapi_ir == rust_ir, (
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"FastAPI and Rust emit divergent Mizan IR for the same registered "
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"functions. Substrate gate is red."
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)
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def test_django_matches_fastapi(django_ir: str, fastapi_ir: str) -> None:
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"""Django ≡ FastAPI."""
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assert django_ir == fastapi_ir, (
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"Django and FastAPI emit divergent Mizan IR for the same "
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"registered functions. Substrate gate is red."
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)
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def test_all_three_match(django_ir: str, fastapi_ir: str, rust_ir: str) -> None:
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"""All three backends emit byte-identical KDL."""
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assert django_ir == fastapi_ir == rust_ir, (
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"Three-way IR divergence — see test_django_matches_fastapi and "
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"test_fastapi_matches_rust for which pair drifts."
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)
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