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Chapter 11 — Async / IO / extensions

7 tests on the most-used extension surfaces. No DB / network needed. Run with cargo test --test cookbook_chapter11_extensions.

$ cargo test --test cookbook_chapter11_extensions
test result: ok. 7 passed; 0 failed; 0 ignored
  • §11.135 cache::get_or_set(&dyn Cache, key, factory, ttl) — loader runs once; subsequent reads hit the cached value. → cache_get_or_set_memoizes_loader, cache_set_get_json_round_trips
  • §11.128 webhook::sign(format, secret, body) + verify_signature(...) round-trip. HexSha256 produces a raw hex digest; HexSha256WithPrefix produces GitHub's sha256=<hex> shape; Base64Sha256 for Stripe-style headers. → webhook_sign_then_verify_round_trip, webhook_github_prefix_format
  • §11.92 signed_url::sign[_at](url, secret, ttl|None) + verify[_at](signed, secret[, now_secs]) for one-time / time-bounded URLs. → signed_url_sign_then_verify_at_respects_expiry, signed_url_no_expiry_always_verifies
  • §11.126 Scheduler::new().every(name, period, job).start() runs jobs at the given period; Handle::shutdown() stops further fires. → scheduler_every_fires_periodic_job

Also available in the framework (no dedicated cookbook recipe yet, but each has live tests under rustango/tests): the WebSocket hub and SSE, the background jobs queue, the retrying HTTP client, email backends, filesystem + S3 storage, media uploads, notifications, signals (wiring receivers to model save/delete events), compression middleware, and CSP-nonce injection.

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