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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.

  • §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

Sub-sections 11.124 (WS hub), 11.125 (SSE), 11.127 (jobs queue), 11.129 (http_client retry/UA), 11.130 (email backends), 11.131 (storage filesystem), 11.132 (storage S3), 11.133 (media uploads), 11.134 (notifications), 11.137 (signals — wire receivers to model save/delete events), 11.138 (compression middleware), 11.139 (CSP nonce) queued for Slice 11b. Several have framework-level live tests under rustango/tests already.

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