Crate af_web 

af-web — reusable axum web infrastructure (the cross-cutting half of agent_core/api/). Provides:

• ApiError — JSON error envelope carrying the request id.
• middleware::request_id / middleware::latency_slo — request-id propagation and the API latency SLO (warn past middleware::SLO_BUDGET_MS).
• with_standard_middleware — wrap any Router with the standard stack.
• health — a ready-made health handler.
• metrics — a minimal Prometheus-compatible liveness metric.

A service composes its product routes and wraps them:

let app = with_standard_middleware(
    Router::new().route("/health", get(health)).merge(product_routes),
);

Re-exports

pub use error::ApiError;

pub use middleware::latency_slo;

pub use middleware::request_id;

pub use middleware::RequestId;

pub use middleware::SLO_BUDGET_MS;

Modules

error

JSON error envelope. Port of the reusable shape of agent_core/api/errors.py.

middleware

Cross-cutting middleware. Ports the reusable concerns of agent_core/api/: request-id propagation (request_id) and the API latency SLO (latency_slo).

Functions

base_router

A Router preseeded with GET /health. Services merge their routes onto it.

health

Standard health endpoint payload.

metrics

Baseline metric shared by reference hosts. Products merge their own metric families into the same endpoint when they need richer observability.

with_standard_middleware

Wrap a router with the standard middleware stack: latency SLO (outermost, so it times everything) over request-id (so the id exists for SLO logs).