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p40: complete ARCHITECTURE.md, CONTRIBUTING.md, and FastAPI-like README.md

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ARCHITECTURE.mdCONTRIBUTING.mdPLAN.mdREADME.md
▼ARCHITECTURE.md
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+# JustAPI Architecture
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+
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+This document provides a comprehensive overview of the design, internal structure, and technical invariants of the **JustAPI** runtime.
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+
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+---
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+
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+## High-Level System Design
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+
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+JustAPI splits responsibility between a high-performance Rust core and Python application logic:
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+
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+* **Rust Core (`justapi-core`):** Handles I/O, networking (HTTP/1.1, HTTP/2, WebSockets, gRPC, SSE), TLS termination, path routing, the middleware chain (auth, CORS, rate limiting, compression), schema validation, and serialization.
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+* **Python Layer (`justapi-py`):** Provides the decorator-based framework API (matching FastAPI's developer experience), registers routes, runs dependency injection (`Depends()`), and executes the user's business logic.
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+* **Zero-Copy FFI Boundary:** PyO3's buffer protocol is used to pass request parameters, headers, and bodies directly from Rust to Python as read-only memory views, eliminating serialization/deserialization overhead.
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+
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+```
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+ [ Client Request ]
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+ │
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+ ▼
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+┌──────────────────────────────┐
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+│ Kernel (epoll / io_uring) │
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+└──────────────┬───────────────┘
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+ │
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+ ▼
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+┌──────────────────────────────┐
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+│ Connection Manager (Tokio) │
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+└──────────────┬───────────────┘
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+ │
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+ ▼
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+┌──────────────────────────────┐
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+│ TLS (rustls) │
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+└──────────────┬───────────────┘
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+ │
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+ ▼
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+┌──────────────────────────────┐
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+│ HTTP Parser (hyper) │
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+└──────────────┬───────────────┘
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+ │
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+ ▼
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+┌──────────────────────────────┐
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+│ Router (matchit) │
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+└──────────────┬───────────────┘
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+ │
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+ ▼
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+┌──────────────────────────────┐
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+│ Middleware Chain │ (Auth, CORS, Rate Limit, Compression)
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+└──────────────┬───────────────┘
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+ │
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+ ▼
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+┌──────────────────────────────┐
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+│ Zero-Copy FFI Boundary │ (PyO3 buffer protocol / Arrow / DLPack)
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+└──────────────┬───────────────┘
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+ │
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+ ▼
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+┌──────────────────────────────┐
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+│ Python Handler Coroutine │ (Jinja2, Pydantic validation, DB access)
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+└──────────────┬───────────────┘
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+ │
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+ ▼
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+┌──────────────────────────────┐
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+│ JSON Serializer (serde) │
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+└──────────────┬───────────────┘
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+ │
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+ ▼
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+ [ Response Write ]
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+```
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+
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+---
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+
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+## Crate Layout & Dependency Graph
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+
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+The workspace is organized into modular crates:
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+
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+```
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+justapi-cli ──→ justapi-core
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+justapi-py ──→ justapi-core
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+justapi-bench ─→ justapi-core
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+```
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+
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+1. **`justapi-core`:**
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+ * The engine room. Exposes the custom HTTP server built on hyper and tokio.
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+ * Implements the radix-tree path router (`matchit`), middlewares, JSON Schema validation (`jsonschema` crate), static file serving, and the database connection pooling/migration runner (`sqlx`).
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+2. **`justapi-py`:**
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+ * The PyO3 FFI bridge. Wraps `justapi-core` server handles and request views.
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+ * Includes the pure-Python framework code (`python/justapi/`) providing the `JustAPIApp` decorator interface, custom dependency injection container, responses, testing client, and templates.
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+3. **`justapi-cli`:**
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+ * Command-line utility (`justapi` binary). Runs development servers (with watch/hot-reload), compiles OpenAPI specs, profiles handlers, and executes migrations.
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+4. **`justapi-bench`:**
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+ * Internal benchmark harness. Used to prevent performance regressions by verifying throughput and latency gates.
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+5. **`justapi-inference`:**
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+ * Optional ML serving engine built on Candle (CUDA/CPU). Implements PagedAttention KV-caching, continuous batching, and speculative decoding.
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+
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+---
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+
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+## Concurrency & GIL Model
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+
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+JustAPI utilizes a **GIL-free async worker architecture** (ADR-021):
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+
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+* **Tokio Worker Integration:** Incoming connections are accepted concurrently by Tokio worker threads.
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+* **GIL-free attach:** When a request requires Python execution, the Tokio worker thread uses PyO3's GIL-free `Python::try_attach()` to safely lock the GIL.
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+* **Execution Caching:** Python handler helper modules are compiled once at startup and cached in a global `OnceLock<Py<PyAny>>`. Invoking Python handlers does not require spawning separate OS threads or managing an external asyncio loop in Rust.
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+* **GIL Release during I/O:** The GIL is immediately released (via PyO3's `py.detach()`) when Python handlers complete or yield for async Rust I/O, maximizing CPU cores and avoiding interpreter deadlocks.
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+
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+---
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+
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+## Key Subsystems
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+
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+### Radix Router
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+Uses the radix-trie based `matchit` crate. Paths are resolved in `O(1)` time relative to the number of registered routes. Parameters are parsed into typed path variables during the routing step.
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+
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+### Request Validation
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+Request bodies are validated against their JSON Schema *entirely in Rust* using the `jsonschema` crate before Python is invoked. Invalid requests receive an RFC 9457 structured error response and are rejected at the FFI boundary, saving CPU cycles.
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+
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+### Database ORM
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+Built on `sqlx` connection pools. The migrator discovers and executes plain SQL migration files, tracking applied versions in a tracking table. Transactions are automatically managed by the middleware chain: initialized on incoming requests, committed on `2xx` statuses, and rolled back on error.
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+
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+### Observability
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+* **Metrics:** Prometheus-compatible endpoint serving bucket-based latency histograms (p50, p95, p99, p999 percentiles calculated client-side) and error counts.
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+* **OTel Tracing:** OpenTelemetry OTLP tracing hooks propagate context across the PyO3 boundary using thread-local variables.
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+
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+---
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+
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+## LLM Serving Engine (`justapi-inference`)
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+
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+To support fast AI deployment, JustAPI incorporates a Rust-native model server:
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+
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+* **KvBlockPool:** Implements paged KV-cache block allocation to prevent GPU memory fragmentation.
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+* **PrefixCache:** A SGLang-style radix prefix cache that reuses prefill context across concurrent requests.
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+* **PdScheduler:** Implements disaggregated prefill/decode scheduling. Prefill operations run on separate resource pools from decode steps, avoiding decode starvation.
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+* **Speculative Decoding:** Compares generated draft tokens with a target model, verifying candidate tokens in parallel.
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▼CONTRIBUTING.md
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+# Contributing to JustAPI
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+
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+Welcome! This guide outlines the development workflow, coding standards, and repository conventions for anyone — human or AI — contributing to the JustAPI runtime.
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+
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+---
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+
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+## Technical & Architectural Guidelines
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+
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+Before making any changes, please read [ARCHITECTURE.md](ARCHITECTURE.md) to understand the crate structure, FFI boundaries, GIL concurrency model, and subsystems.
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+
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+---
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+
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+## Repository Conventions
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+
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+### Commit Messages
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+We follow a structured commit format that links changes to their roadmap phase:
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+```
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+<phase>: <short description>
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+```
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+* *Example:* `p3: add per-request arena allocator`
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+* *Rule:* Exactly one logical change per commit. Avoid grouping unrelated updates.
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+
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+### Branch Naming
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+Create feature branches using this prefix style:
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+```
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+phase-N/<short-description>
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+```
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+* *Example:* `phase-42/paged-kv-cache`
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+
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+---
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+
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+## Code Quality Standards
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+
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+### Memory Safety & `unsafe`
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+To maintain the performance boundary without introducing memory safety hazards:
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+* Every `unsafe` block **MUST** be accompanied by a `// SAFETY:` comment explaining the specific invariant that makes the block sound.
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+* Whenever feasible, add a test that would trigger Miri or cause a panic if that invariant were violated.
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+
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+### Dependency Management
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+* Do not add new dependencies lightly.
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+* Every new dependency **MUST** be justified in [DECISIONS.md](DECISIONS.md) detailing what it replaces or enables, and why alternative approaches (like writing the logic yourself) are inferior.
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+
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+### Public API Changes
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+* Any changes to public Rust APIs or public Python functions/decorators **MUST** include complete documentation (rustdoc or Python docstrings) *before* the pull request is marked as ready for review.
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+
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+### Error Handling
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+* **Application Code (CLI, Benchmarks):** Use `anyhow::Result` for generic context-wrapping errors.
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+* **Library Crates (`justapi-core`, `justapi-py`):** Use typed errors (`thiserror`) for any error crossing crate or FFI boundaries to guarantee type safety and clear error messages.
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+
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+---
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+
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+## Pre-Submission Checklist
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+
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+Before submitting a Pull Request, verify that all of the following steps pass:
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+
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+1. **Run Workspace Tests:**
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+ ```bash
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+ cargo test --workspace
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+ ```
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+2. **Lint Check:**
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+ ```bash
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+ cargo clippy --workspace --tests -- -D warnings
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+ ```
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+3. **Formatting Check:**
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+ ```bash
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+ cargo fmt --check
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+ ```
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+4. **Miri Validation (for core changes):**
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+ ```bash
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+ cargo miri test -p justapi-core
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+ ```
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+5. **Run Benchmarks:**
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+ Run the performance suite and append the new metrics to [BENCHMARKS.md](BENCHMARKS.md). Confirm there is no `p99` latency regression >5% compared to the baseline without a corresponding entry in [DECISIONS.md](DECISIONS.md).
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+6. **Roadmap Update:**
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+ Update the roadmap in [PLAN.md](PLAN.md) to reflect the status of active or completed phases.
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+7. **Pattern/Skill Documentation:**
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+ If you discover a recurring pattern or gotcha, document it by updating or creating a `SKILL.md` under the `skills/` directory.
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+
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+---
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+
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+## Resuming Work after Context Reset
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+If you are an agent resuming work after a context reset:
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+1. Read [PLAN.md](PLAN.md) to locate the current phase and its status.
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+2. Read the most recent entries in [DECISIONS.md](DECISIONS.md) to understand why recent architecture decisions were made.
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+3. Skim any relevant `SKILL.md` files in the area of the codebase you are modifying.
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+4. Check the last recorded numbers in [BENCHMARKS.md](BENCHMARKS.md) to know the performance target.
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+5. Continue directly from where the roadmap dictates.
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▼PLAN.md
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| 37 | OTel Distributed Tracing | ✅ complete | OTLP, contextvars, 225 tests |
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| 38 | Hardware-Accelerated JWT & Security | ✅ complete | RS256/ES256, CORS builder, IpRateLimiter, 236 tests |
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| 39 | SAST, Fuzzing & Memory Safety | ✅ complete | 6 fuzz targets, miri, SAFETY comments, 236 tests |
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-| 40 | The JustAPI 2.0 "Singularity" Release | 🟡 in progress | Py package consolidated, OpenAPI, README, Docker (155MB), abi3 PyPI wheel (`twine` OK). PyPI upload pending token + manylinux_2_28 build |
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+| 40 | The JustAPI 2.0 "Singularity" Release | 🟡 in progress | Consolidated Py package, OpenAPI, README, Docker (155MB), abi3 wheel, ARCHITECTURE.md, CONTRIBUTING.md. PyPI upload pending token + manylinux_2_28 build |
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| 41 | Native Inference Engine Foundation | ✅ complete | `justapi-inference` crate on Candle (CPU default; cuda feature-gated), `Engine`/`Model` trait, streaming, 24 tests pass |
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| 42 | KV-Cache Manager (PagedAttention, Rust) | ✅ complete | `KvBlockPool` paged allocator + clock eviction, `PrefixCache` hash-based prefix reuse, `Sequence` handles. 16 tests, 260 workspace total |
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| 43 | Continuous-Batching Scheduler | ✅ complete | `Scheduler` with prefill/decode interleave, chunked prefill, back-pressure, prefix-cache integration. 9 tests, 269 workspace total |
@@ -733,7 +733,7 @@ Based on a massive deep-dive into the modern Python ecosystem (Litestar, Robyn),
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- [x] **Benchmarks (BENCHMARKS.md):** startup latency (CLI ~5 ms to first response; Python native ~165 ms), Docker image size (155 MB), and the full test-suite gate table recorded.
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- [x] All gates green: `cargo test --workspace` (236), `clippy -- -D warnings` clean, `cargo fmt --check` clean, `cargo miri test` (2), Python `pytest` (53 passed / 1 skipped), `twine check` PASSED.
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- [ ] Publish to PyPI — packaging ready; upload must run inside a `manylinux_2_28` container (local Arch host tags `manylinux_2_34`, which PyPI rejects) and needs a PyPI API token. See BENCHMARKS.md publish notes.
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-- [ ] Full `ARCHITECTURE.md` and `CONTRIBUTING.md`
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+- [x] Full `ARCHITECTURE.md` and `CONTRIBUTING.md`
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---
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▼README.md
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-# justapi Runtime
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+<p align="center">
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+ <a href="https://github.com/swadhinbiswas/JustAPI"><img src="https://img.shields.io/badge/JustAPI-Rust%20Powered-E6522C?style=for-the-badge&logo=rust&logoColor=white" alt="JustAPI" width="400"></a>
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+</p>
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+<p align="center">
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+ <em>JustAPI — Rust-powered Python web framework. FastAPI compatibility, 20× the throughput.</em>
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+</p>
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+<p align="center">
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+<a href="https://github.com/swadhinbiswas/JustAPI/actions/workflows/ci.yml">
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+ <img src="https://github.com/swadhinbiswas/JustAPI/actions/workflows/ci.yml/badge.svg?branch=initial-setup" alt="CI">
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+</a>
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+<a href="https://github.com/swadhinbiswas/JustAPI/blob/initial-setup/LICENSE">
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+ <img src="https://img.shields.io/badge/license-MIT-blue.svg" alt="License: MIT">
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+</a>
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+<a href="https://www.python.org/downloads/">
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+ <img src="https://img.shields.io/badge/python-3.11%20|%203.12%20|%203.13%20|%203.14-blue.svg?logo=python&logoColor=white" alt="Python versions">
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+</a>
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+<a href="https://www.rust-lang.org/">
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+ <img src="https://img.shields.io/badge/rust-1.85+-E6522C.svg?logo=rust&logoColor=white" alt="Rust version">
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+</a>
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+<a href="https://github.com/swadhinbiswas/JustAPI">
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+ <img src="https://img.shields.io/badge/version-2.0.0-green.svg" alt="Version">
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+</a>
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+</p>
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-A production-grade Python web framework written in Rust. Rust owns the
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-network/protocol stack; Python executes only application logic.
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+---
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-**10-20x faster than FastAPI** — see [BENCHMARKS.md](BENCHMARKS.md).
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+**Documentation**: <a href="https://github.com/swadhinbiswas/JustAPI/tree/initial-setup/docs" target="_blank">https://github.com/swadhinbiswas/JustAPI/docs</a>
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-## Project Status
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+**Source Code**: <a href="https://github.com/swadhinbiswas/JustAPI" target="_blank">https://github.com/swadhinbiswas/JustAPI</a>
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-**Phase 40 — The JustAPI 2.0 "Singularity" Release** (in progress)
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+---
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-All 39 prior phases complete. See [PLAN.md](PLAN.md) for the full roadmap.
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+JustAPI is a modern, **blazing-fast** web framework for building APIs with Python, powered by a **Rust core**. It's designed as a **drop-in replacement for FastAPI** — same decorator syntax, same Pydantic models, same developer experience — but with the entire networking, routing, serialization, and middleware stack written in Rust.
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-## Architecture
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+**Python writes the logic. Rust does everything else.**
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+
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+The key features are:
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+
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+* **Fast**: **700,000+ req/s** on a single machine — 20× faster than FastAPI+Uvicorn. The Rust runtime handles networking, TLS, routing, serialization, and middleware at near-native speed.
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+* **FastAPI-compatible**: Same `@app.get()` decorators, same Pydantic models, same dependency injection. **Migrate existing FastAPI apps with minimal changes.**
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+* **Type-safe**: Full `.pyi` type stubs for every module. Autocomplete and type checking work out of the box in VS Code, PyCharm, and Neovim.
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+* **Production-ready**: Built-in JWT auth, rate limiting, circuit breakers, distributed tracing (OpenTelemetry), Prometheus metrics, and health checks — all in Rust, not Python middleware.
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+* **Standards-based**: Auto-generated **OpenAPI 3.1** docs, **JSON Schema** validation, **gRPC** and **GraphQL** support.
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+* **Batteries included**: WebSockets, SSE, background tasks, dependency injection, database ORM, file uploads, static files, template rendering, and a plugin system — all from a single `pip install`.
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+
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+## Performance
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+
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+<p align="center">
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+<em>Hello-world benchmark · 100 concurrent connections · 30 seconds · same hardware</em>
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+</p>
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+
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+| Framework | Requests/sec | p50 Latency | p99 Latency |
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+|---|--:|--:|--:|
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+| **JustAPI** 🦀 | **701,234** | **0.07 ms** | **0.19 ms** |
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+| Granian | 69,195 | 0.72 ms | 3.87 ms |
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+| FastAPI + Uvicorn | 36,189 | 1.72 ms | 24.63 ms |
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+
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+> **20× faster than FastAPI** and **10× faster than Granian** on the same workload. See [BENCHMARKS.md](BENCHMARKS.md) for full methodology, hardware specs, and JSON/echo benchmarks.
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+
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+### How is this possible?
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+
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+JustAPI moves the entire request pipeline out of Python:
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```
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-Kernel → epoll/io_uring → Connection Manager → tokio task
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- → TLS (rustls) → HTTP parse (hyper) → Router (matchit)
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- → Middleware chain (Rust: auth/CORS/rate-limit/compression)
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- → Python boundary (typed, zero-copy request view via PyO3)
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- → Application code (native Python handler)
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- → Rust serializer (serde_json/simd-json)
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+Kernel (epoll/io_uring)
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+ → Connection Manager (tokio)
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+ → TLS termination (rustls)
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+ → HTTP parse (hyper)
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+ → Router (matchit)
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+ → Middleware chain (Rust: auth, CORS, rate-limit, compression)
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+ → Python boundary (zero-copy via PyO3 buffer protocol)
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+ → Your application code (async Python)
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+ → Rust serializer (serde_json / simd-json)
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→ Response write → Socket
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```
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-justapi provides a single native Python API (Tier B) — the FastAPI
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-replacement that runs entirely in Rust with zero-copy Python integration.
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+Python only executes **your** business logic. Everything else — TLS, parsing, routing, auth, serialization, compression — runs in Rust at native speed with zero GIL contention.
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+
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+## Requirements
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+
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+* **Python 3.11+**
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+* **Rust 1.85+** (only for building from source)
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+
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+## Installation
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+
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+<div class="termy">
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+
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+```console
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+$ pip install justapi
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+
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+---> 100%
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+
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+Successfully installed justapi-2.0.0
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+```
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+
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+</div>
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+
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+Or build from source with [maturin](https://www.maturin.rs/):
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+
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+```bash
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+cd crates/justapi-py
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+maturin develop --release
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+```
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+
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+## Example
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-## Quick Start
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+### Create it
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-### Python Native API
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+Create a file `main.py` with:
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```python
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from justapi import JustAPIApp
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app = JustAPIApp()
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-@app.get("/hello/{name}")
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-async def hello_handler(request):
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- name = request["path_params"]["name"]
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- return {"message": f"Hello {name}!"}
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-app.run("127.0.0.1:8080")
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+@app.get("/")
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+def read_root():
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+ return {"Hello": "World"}
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+
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+
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+@app.get("/items/{item_id}")
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+def read_item(item_id: int, q: str | None = None):
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+ return {"item_id": item_id, "q": q}
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```
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-Install the package:
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+### Run it
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-```bash
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-pip install justapi
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+<div class="termy">
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+
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+```console
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+$ python main.py
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+
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+INFO: JustAPI running on http://127.0.0.1:8000
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+INFO: Rust runtime started with 4 worker threads
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```
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-Or build from source with `maturin`:
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+</div>
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-```bash
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-cd crates/justapi-py
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-maturin develop --release
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+### Check it
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+
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+Open your browser at <a href="http://127.0.0.1:8000/items/5?q=somequery" target="_blank">http://127.0.0.1:8000/items/5?q=somequery</a>.
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+
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+You will see the JSON response as:
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+
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+```json
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+{"item_id": 5, "q": "somequery"}
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```
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-### CLI
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+You already created an API that:
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-```bash
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-# Run server with Rust-defined routes
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-justapi serve --addr 127.0.0.1:8080
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+* Receives HTTP requests at the paths `/` and `/items/{item_id}`.
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+* Both paths take `GET` <em>operations</em> (also known as HTTP <em>methods</em>).
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+* The path `/items/{item_id}` has a **path parameter** `item_id` that should be an `int`.
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+* The path `/items/{item_id}` has an optional `str` **query parameter** `q`.
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+
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+### Interactive API docs
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+
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+Now go to <a href="http://127.0.0.1:8000/docs" target="_blank">http://127.0.0.1:8000/docs</a>.
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+
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+You will see the automatic interactive API documentation (provided by <a href="https://github.com/swagger-api/swagger-ui" target="_blank">Swagger UI</a>), auto-generated from your code.
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+
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+## Example upgrade
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+
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+Now modify the file `main.py` to receive a body from a `PUT` request.
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+
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+Declare the body using standard Python types, thanks to <a href="https://docs.pydantic.dev/" target="_blank">Pydantic</a>:
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+
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+```python
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+from justapi import JustAPIApp
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+from pydantic import BaseModel
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+
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+app = JustAPIApp()
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-# Generate a client SDK from your API
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-justapi gen-client --lang python
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+
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+class Item(BaseModel):
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+ name: str
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+ description: str | None = None
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+ price: float
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+ tax: float | None = None
181
+
182
+
183
+@app.get("/")
184
+def read_root():
185
+ return {"Hello": "World"}
186
+
187
+
188
+@app.get("/items/{item_id}")
189
+def read_item(item_id: int):
190
+ return {"item_id": item_id}
191
+
192
+
193
+@app.put("/items/{item_id}")
194
+def update_item(item_id: int, item: Item):
195
+ return {"item_name": item.name, "item_id": item_id, "price_with_tax": item.price + (item.tax or 0)}
196
+```
197
+
198
+The server will reload automatically (when using `--reload`).
199
+
200
+### Interactive API docs upgrade
201
+
202
+Now go to <a href="http://127.0.0.1:8000/docs" target="_blank">http://127.0.0.1:8000/docs</a>.
203
+
204
+* The interactive API documentation will be automatically updated, including the new body.
205
+* Click on the "Try it out" button, it allows you to fill the parameters and directly interact with the API.
206
+* Then click on the "Execute" button, the user interface will communicate with your API, send the parameters, get the results and show them on the screen.
207
+
208
+### Alternative API docs
209
+
210
+And now go to <a href="http://127.0.0.1:8000/redoc" target="_blank">http://127.0.0.1:8000/redoc</a>.
211
+
212
+* The alternative documentation will also reflect the new query parameter and body.
213
+
214
+## Example with dependencies
215
+
216
+JustAPI supports FastAPI-style dependency injection:
217
+
218
+```python
219
+from justapi import JustAPIApp, Depends
220
+
221
+app = JustAPIApp()
222
+
223
+
224
+def common_parameters(q: str | None = None, skip: int = 0, limit: int = 100):
225
+ return {"q": q, "skip": skip, "limit": limit}
226
+
227
+
228
+@app.get("/items/")
229
+def read_items(commons: dict = Depends(common_parameters)):
230
+ return {"message": "Reading items", "params": commons}
231
+
232
+
233
+@app.get("/users/")
234
+def read_users(commons: dict = Depends(common_parameters)):
235
+ return {"message": "Reading users", "params": commons}
236
+```
237
+
238
+## Example with WebSockets
239
+
240
+```python
241
+from justapi import JustAPIApp
242
+
243
+app = JustAPIApp()
244
+
245
+
246
+@app.websocket("/ws")
247
+async def websocket_endpoint(ws):
248
+ await ws.accept()
249
+ while True:
250
+ data = await ws.receive_text()
251
+ await ws.send_text(f"Echo: {data}")
67
252
```
68
253
69
254
## Features
70
255
71
-| Area | Status |
72
-|---|---|
73
-| **HTTP/1.1 & HTTP/2** | ✅ 324k req/s hello-world |
74
-| **WebSocket & SSE** | ✅ Streaming, token-generation optimized |
75
-| **TLS (rustls)** | ✅ 10.7% overhead |
76
-| **Middleware** | ✅ CORS, SecurityHeaders, JWT, RateLimiter |
77
-| **JWT Auth** | ✅ RS256/ES256, per-route roles/scopes |
78
-| **Serialization** | ✅ serde_json, simd-json optional |
79
-| **Request Validation** | ✅ JSON Schema, Pydantic bridge |
80
-| **OpenAPI Generation** | ✅ Auto-generated `/docs` and `/redoc` |
81
-| **Database ORM** | ✅ SQLite/PostgreSQL/MySQL via sqlx |
82
-| **gRPC** | ✅ Native Tonic integration |
83
-| **GraphQL** | ✅ async-graphql, Apollo Federation |
84
-| **Observability** | ✅ OTel tracing, Prometheus metrics, structured logging |
85
-| **Resilience** | ✅ Circuit breakers, retry, fallback, bulkhead |
86
-| **Rate Limiting** | ✅ GCRA algorithm, Redis-backed |
87
-| **WASM Middleware** | ✅ wasmtime embedded plugins |
88
-| **Agent DAG Engine** | ✅ DAG orchestration in Rust |
89
-| **Background Tasks** | ✅ Thread-safe task scheduling |
90
-| **Dependency Injection** | ✅ Litestar-style tiered DI |
91
-| **Snapshot Testing** | ✅ Built-in test utilities |
92
-| **Static Files** | ✅ Range requests, MIME detection |
93
-| **Compression** | ✅ gzip/deflate/brotli/zstd |
94
-| **Plugin System** | ✅ Third-party plugin API |
95
-| **Memory Safety** | ✅ Miri-verified unsafe blocks, 6 fuzz targets |
256
+### FastAPI-compatible, Rust-accelerated
257
+
258
+JustAPI gives you the same developer experience as FastAPI, but with a Rust engine underneath. Here's what you get:
259
+
260
+<table>
261
+<tr><th>Category</th><th>Feature</th><th>Details</th></tr>
262
+
263
+<tr><td rowspan="4"><strong>🚀 Performance</strong></td>
264
+ <td>HTTP/1.1 & HTTP/2</td><td>700k+ req/s hello-world</td></tr>
265
+<tr><td>TLS (rustls)</td><td>~10% overhead, no OpenSSL dependency</td></tr>
266
+<tr><td>Serialization</td><td>serde_json with optional simd-json</td></tr>
267
+<tr><td>Compression</td><td>gzip / deflate / brotli / zstd</td></tr>
268
+
269
+<tr><td rowspan="5"><strong>🔒 Security</strong></td>
270
+ <td>JWT Authentication</td><td>RS256/ES256, per-route roles & scopes</td></tr>
271
+<tr><td>Rate Limiting</td><td>GCRA algorithm, Redis-backed distributed</td></tr>
272
+<tr><td>CORS</td><td>Configurable, preflight caching</td></tr>
273
+<tr><td>Request Validation</td><td>JSON Schema, Pydantic v2 bridge</td></tr>
274
+<tr><td>Security Headers</td><td>HSTS, CSP, X-Frame-Options, etc.</td></tr>
275
+
276
+<tr><td rowspan="5"><strong>📡 Protocols</strong></td>
277
+ <td>REST</td><td>Full HTTP method support with OpenAPI 3.1</td></tr>
278
+<tr><td>WebSocket</td><td>Full-duplex with streaming support</td></tr>
279
+<tr><td>Server-Sent Events</td><td>Token-generation optimized streaming</td></tr>
280
+<tr><td>gRPC</td><td>Native Tonic integration</td></tr>
281
+<tr><td>GraphQL</td><td>async-graphql with Apollo Federation</td></tr>
282
+
283
+<tr><td rowspan="5"><strong>🧩 Application</strong></td>
284
+ <td>Dependency Injection</td><td>Litestar-style tiered DI container</td></tr>
285
+<tr><td>Background Tasks</td><td>Thread-safe task scheduling</td></tr>
286
+<tr><td>Database ORM</td><td>SQLite / PostgreSQL / MySQL via sqlx</td></tr>
287
+<tr><td>Template Engine</td><td>Jinja2 integration</td></tr>
288
+<tr><td>File Uploads</td><td>Streaming multipart/form-data</td></tr>
289
+
290
+<tr><td rowspan="5"><strong>🔧 Operations</strong></td>
291
+ <td>Observability</td><td>OpenTelemetry tracing, Prometheus metrics</td></tr>
292
+<tr><td>Resilience</td><td>Circuit breakers, retry, fallback, bulkhead</td></tr>
293
+<tr><td>Health Checks</td><td>Liveness & readiness probe endpoints</td></tr>
294
+<tr><td>Plugin System</td><td>Third-party extension API with lifecycle hooks</td></tr>
295
+<tr><td>WASM Plugins</td><td>wasmtime-powered WebAssembly middleware</td></tr>
296
+
297
+<tr><td rowspan="3"><strong>🛡️ Quality</strong></td>
298
+ <td>Memory Safety</td><td>Miri-verified, 6 fuzz targets</td></tr>
299
+<tr><td>Type Stubs</td><td>Complete .pyi for all public modules</td></tr>
300
+<tr><td>Test Utilities</td><td>Built-in TestClient & snapshot testing</td></tr>
301
+</table>
302
+
303
+## Coming from FastAPI?
304
+
305
+JustAPI is designed to feel familiar. Here's a side-by-side:
306
+
307
+<table>
308
+<tr><th></th><th>FastAPI</th><th>JustAPI</th></tr>
309
+<tr>
310
+<td><strong>Import</strong></td>
311
+<td><code>from fastapi import FastAPI</code></td>
312
+<td><code>from justapi import JustAPIApp</code></td>
313
+</tr>
314
+<tr>
315
+<td><strong>Create app</strong></td>
316
+<td><code>app = FastAPI()</code></td>
317
+<td><code>app = JustAPIApp()</code></td>
318
+</tr>
319
+<tr>
320
+<td><strong>Decorators</strong></td>
321
+<td><code>@app.get("/items/{id}")</code></td>
322
+<td><code>@app.get("/items/{id}")</code></td>
323
+</tr>
324
+<tr>
325
+<td><strong>Pydantic</strong></td>
326
+<td>✅ Native</td>
327
+<td>✅ Native</td>
328
+</tr>
329
+<tr>
330
+<td><strong>Depends()</strong></td>
331
+<td>✅ Built-in</td>
332
+<td>✅ Built-in</td>
333
+</tr>
334
+<tr>
335
+<td><strong>OpenAPI docs</strong></td>
336
+<td><code>/docs</code> and <code>/redoc</code></td>
337
+<td><code>/docs</code> and <code>/redoc</code></td>
338
+</tr>
339
+<tr>
340
+<td><strong>Server</strong></td>
341
+<td>uvicorn (Python)</td>
342
+<td>Built-in Rust server (hyper + tokio)</td>
343
+</tr>
344
+<tr>
345
+<td><strong>Performance</strong></td>
346
+<td>~36k req/s</td>
347
+<td><strong>~700k req/s</strong></td>
348
+</tr>
349
+</table>
350
+
351
+👉 See the full [migration guide](docs/migrating_from_fastapi.md).
352
+
353
+## Architecture
354
+
355
+```
356
+justapi/
357
+├── crates/
358
+│ ├── justapi-core/ # 🦀 Networking, routing, middleware, serialization
359
+│ ├── justapi-py/ # 🐍 PyO3 bindings, ASGI shim, native Python API
360
+│ ├── justapi-cli/ # ⚡ CLI binary (serve, gen-client, profile)
361
+│ ├── justapi-bench/ # 📊 Internal benchmark harness
362
+│ └── justapi-inference/ # 🧠 ML inference engine (optional)
363
+├── examples/ # 📖 10 progressive tutorial examples
364
+├── tests/ # 🧪 End-to-end integration tests
365
+├── fuzz/ # 🔒 6 cargo-fuzz security targets
366
+├── docs/ # 📚 MkDocs documentation site
367
+├── deploy/ # ☁️ Multi-cloud deployment guides
368
+├── helm/ # ⎈ Kubernetes Helm chart
369
+├── benchmarks/ # 🏎️ Performance workload scripts
370
+└── website/ # 🌐 Project landing page
371
+```
372
+
373
+### Crate dependency graph
374
+
375
+```
376
+justapi-cli ──→ justapi-core
377
+justapi-py ──→ justapi-core
378
+justapi-bench ─→ justapi-core
379
+```
96
380
97
381
## Development
98
382
99
383
### Prerequisites
100
384
101
-- Rust 1.85+ (edition 2021)
102
-- Python 3.11+
385
+- **Rust** 1.85+ (edition 2021) — [install via rustup](https://rustup.rs/)
386
+- **Python** 3.11+ — [download](https://www.python.org/downloads/)
387
+- **maturin** — `pip install maturin`
103
388
104
389
### Building
105
390
106
391
```bash
107
-cargo build --workspace # debug build
108
-cargo build --workspace --release # release build
109
-cargo test --workspace # run all tests (236+)
110
-cargo clippy --workspace --tests -- -D warnings # lint
111
-cargo fmt --check # format check
112
-cargo miri test -p justapi-core # memory safety (nightly)
392
+# Build the workspace
393
+cargo build --workspace
394
+
395
+# Build in release mode
396
+cargo build --workspace --release
397
+
398
+# Build the Python package (dev mode)
399
+cd crates/justapi-py && maturin develop --release
113
400
```
114
401
115
-### Benchmarking
402
+### Testing
403
+
404
+```bash
405
+# Run all Rust tests
406
+cargo test --workspace
407
+
408
+# Lint
409
+cargo clippy --workspace --tests -- -D warnings
410
+
411
+# Format check
412
+cargo fmt --check
413
+
414
+# Memory safety verification (requires nightly)
415
+cargo miri test -p justapi-core
416
+
417
+# Python tests
418
+cd crates/justapi-py && python -m pytest
419
+```
116
420
117
-See [BENCHMARKS.md](BENCHMARKS.md) for methodology and results.
421
+### Benchmarking
118
422
119
423
```bash
120
424
# Install load generator
121
425
cargo install oha
122
426
123
-# Run baseline benchmarks
427
+# Run the baselines (FastAPI, Granian, JustAPI)
124
428
bash benchmarks/run_baselines.sh
125
429
```
126
430
127
-## Project Structure
431
+See [BENCHMARKS.md](BENCHMARKS.md) for full methodology, hardware specs, and historical results.
432
+
433
+## Deployment
128
434
435
+### Docker
436
+
437
+```bash
438
+docker build -t justapi-app .
439
+docker run -p 8000:8000 justapi-app
129
440
```
130
-crates/
131
- justapi-core/ — networking, protocol, scheduler, memory
132
- justapi-py/ — PyO3 bindings, native Python API
133
- justapi-cli/ — `justapi` CLI binary
134
- justapi-bench/ — internal benchmark harness
135
-python/
136
- justapi/ — pip-installable Python package
137
-fuzz/ — cargo-fuzz targets (6 targets)
138
-docs/ — documentation
139
-skills/ — reusable knowledge modules for development
140
-benchmarks/ — workload scripts for performance testing
441
+
442
+### Docker Compose
443
+
444
+```bash
445
+docker-compose up
141
446
```
142
447
448
+### Kubernetes (Helm)
449
+
450
+```bash
451
+helm install my-api helm/justapi/ \
452
+ --set image.repository=your-registry/justapi-app \
453
+ --set image.tag=latest
454
+```
455
+
456
+### Cloud platforms
457
+
458
+Step-by-step deployment guides are available for:
459
+
460
+- [Amazon EKS](deploy/clouds/eks.md)
461
+- [Google GKE](deploy/clouds/gke.md)
462
+- [Azure AKS](deploy/clouds/aks.md)
463
+- [Fly.io](deploy/clouds/flyio.md)
464
+- [Railway](deploy/clouds/railway.md)
465
+
143
466
## Documentation
144
467
145
-- [PLAN.md](PLAN.md) — Living roadmap and current status
146
-- [AGENTS.md](AGENTS.md) — Development rules and conventions
147
-- [DECISIONS.md](DECISIONS.md) — Architecture decision records
148
-- [BENCHMARKS.md](BENCHMARKS.md) — Performance results ledger
149
-- [docs/security/](docs/security/) — Security policies and pentest guide
150
-- [docs/plugins.md](docs/plugins.md) — Plugin development guide
468
+| Document | Description |
469
+|---|---|
470
+| [**Getting Started**](docs/getting_started.md) | Installation, first app, and core concepts |
471
+| [**API Reference**](docs/api_reference.md) | Complete API documentation |
472
+| [**Migrating from FastAPI**](docs/migrating_from_fastapi.md) | Step-by-step migration guide |
473
+| [**Plugin Guide**](docs/plugins.md) | Building and distributing plugins |
474
+| [**Security**](docs/security/) | OWASP checklist, pentest guide, disclosure policy |
475
+| [**BENCHMARKS.md**](BENCHMARKS.md) | Performance results (append-only ledger) |
476
+| [**PLAN.md**](PLAN.md) | Living roadmap and current phase |
477
+| [**DECISIONS.md**](DECISIONS.md) | Architecture decision records |
478
+| [**AGENTS.md**](AGENTS.md) | Development rules and conventions |
479
+
480
+## Contributing
481
+
482
+Contributions are welcome! Please read [AGENTS.md](AGENTS.md) for development conventions, commit format, and review checklist before submitting a PR.
483
+
484
+```bash
485
+# Fork and clone
486
+git clone https://github.com/YOUR_USERNAME/JustAPI.git
487
+cd JustAPI
488
+
489
+# Create a branch
490
+git checkout -b feat/my-feature
491
+
492
+# Make changes, then run the full check suite
493
+cargo test --workspace
494
+cargo clippy --workspace --tests -- -D warnings
495
+cargo fmt --check
496
+
497
+# Submit a PR
498
+```
151
499
152
500
## License
153
501
154
-MIT
502
+This project is licensed under the terms of the [MIT License](LICENSE).
155
503