Rullst Core ⚙️

rullst-core encapsulates the foundational primitives, routing engines, state management, and configuration layers of the Rullst Framework. It acts as the beating heart that orchestrates HTTP handlers, middleware, and backend worker systems.

✨ Features

Typed Axum Integration: Wraps Axum routing while retaining access to the underlying router and middleware ecosystem.
Bounded Server Functions: #[server_function] shares the versioned rullst.client v1 envelope between native Axum routes and Wasm callers, with a 256 KiB body ceiling, correlation checks, same-origin paths, CSRF header forwarding, and message-free typed failures. Identity and domain policy stay server-owned.
Runtime Telemetry: Exposes process/runtime snapshots and tracing-span collection for consumers such as Rullst Studio.
Lifecycle-aware Readiness: An opt-in process lifecycle gates new requests during startup, dependency unavailability, and graceful drain. It accepts at most 32 immutable component labels and exposes counts—not labels or errors—on /ready; dependency checks and multi-replica coordination remain host work.
Typed Failures: Server, scheduler, queue, storage, and resilience APIs expose structured errors for fallible paths. The repository's zero-panic policy is CI-scoped, not an absolute runtime guarantee.
Dependency Injection: Type-safe, intuitive global state management across routes and background workers.
Environment Management: Native dotenv and TOML configuration loaders for different deployment targets (Staging, Production, Local).
Durable Scheduled Queues: SQLite and Redis persist bounded dispatch_at timestamps and never claim a job before its millisecond due time. Delivery is poll-dependent and at-least-once.
Explicit Completion History: SQLite deletes successful payloads by default. Queue::sqlite_with_completed_history opts into a bounded retained history for Studio/operations, with atomic pruning and an explicit purge API.
Metadata-only Cache Inspection: Memory and Redis drivers can return a sorted snapshot of at most 200 logical keys, UTF-8 value lengths and TTLs without returning values. Custom drivers fail explicitly unless they opt in; authorization and safe rendering of logical keys remain caller policy.
Offline Sync Foundation: The optional native offline-sync feature provides bounded replay-safe mutations, explicit conflict resolution, and account-bound AES-256-GCM snapshots. Its static-dispatch coordinator bounds requests, times them out, and detects stalled cursors. Applications still own Keychain/Keystore access, atomic platform persistence, authenticated HTTP, retry, and background scheduling.

🚀 Usage

Most developers will not depend on rullst-core directly, as it is re-exported seamlessly through the primary rullst crate.

If you are developing a plugin or advanced middleware for the Rullst ecosystem, you can add it explicitly:

Install the exact stable train with cargo add rullst-core@12.0.0.

Core is runtime-only by default. Add just the database capabilities the application needs:

[dependencies]
rullst-core = { version = "12.0.0", features = ["orm", "queue-sqlite", "offline-sync"] }

Enable orm, queue-sqlite, queue-redis, offline-sync, or telemetry only when that integration is required. The primary rullst crate keeps orm and queue-sqlite in its default feature set for application compatibility.

Both built-in queue drivers implement Queue::dispatch_at for schedules up to 366 days ahead. SQLite performs an automatic additive schema migration; Redis uses a sorted set and server time, with a digest-pinned live CI contract. Custom drivers fail with QueueError::Unsupported for future jobs until they implement the scheduling method explicitly.

Successful SQLite jobs are removed unless the application explicitly calls Queue::sqlite_with_completed_history(database_url, retained_jobs). The limit must be between 1 and 100,000; completion and pruning share one transaction. Retained rows include the original payload, so the application must restrict Studio/inspection access and choose an appropriate retention policy. Use Queue::purge_completed_history to remove them.

Cache::inspect(limit) is opt-in diagnostic data, not an administration endpoint. The limit must be 1–200. CacheEntryMetadata deliberately redacts the logical key from Debug and never carries the cached value, but logical_key() still returns application data to an authorized caller. Rullst Studio converts it into a process-bound opaque token before rendering it.

For orchestrated deployments, construct ApplicationLifecycle, mount health_router_with_lifecycle(lifecycle.clone()), then pass the same value to Server::with_lifecycle. The server marks startup complete after binding, begins drain before Axum waits for accepted requests, and marks startup failure or termination as stopped. run_with_shutdown permits a caller-owned trigger. The process-local registry does not probe dependencies, authorize application requests, coordinate replicas, or guarantee load-balancer propagation.

Minimal HTTP Server

use rullst_core::{Router, Server};
use rullst_core::routing::get;

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let app = Router::new().route("/health", get(|| async { "ok" }));
    Server::new(app).run(3000).await?;
    Ok(())
}

🔐 Security Audit

Repository workflows exercise Core with unit, integration, fuzz, and Miri jobs within their declared scopes. Consult the exact workflow run and commit for evidence; these tools do not prove the absence of every panic, leak, or vulnerability.

📚 Documentation