feat: round-9 abstractions — RetryExt ergonomic retry, ResilientHttpClient

.hermes/plans/mytheclipse-round8-spec.md

@@ -1,18 +1,23 @@
-# Implementation Spec: Round 8 — COMPLETE
+# Round 8 — COMPLETE
 
 ## New Feature
-
-### ResilientHttpClient (mytheclipse-http, resilience)
-File: `crates/mytheclipse-http/src/resilient_client.rs`
-- `ResilientHttpClient` — reqwest Client + ServiceBuilder pipeline (retry/circuit/timeout)
-- `ResilientClientConfig` — timeout, max_attempts, rate, circuit_breaker
-- `send(req)` / `get(url)` / `post(url, body)` — all run through ServiceBuilder::run
-- Error type `RunError<Box<dyn Error>>` (HttpError alias)
-- 2 tests
+### ResilientHttpClient (mytheclipse-http, resilience feature)
+- File: `crates/mytheclipse-http/src/resilient_client.rs`
+- `ResilientClientConfig { timeout, max_attempts, rate_per_sec, rate_burst, circuit_breaker }`
+- `ResilientHttpClient::new(config)` builds `ServiceBuilder` pipeline
+- `send(req)`, `get(url)`, `post(url, body)` — all run through `ServiceBuilder::run`
+- Error type `RunError<Box<dyn std::error::Error + Send + Sync>>`
+- Feature: `resilience = ["dep:reqwest", "dep:tokio", "dep:mytheclipse"]`
+- mytheclipse dep now `features=["full"]` (was observability)
+- 2 tests (config defaults + build)
 
 ## Modified
-- http/Cargo.toml: +resilience feature, mytheclipse dep features=full
-- http/lib.rs: +module +export
-- core/lib.rs: pub use RunError, ServiceConfig from service_builder
+- http/Cargo.toml — resilience feature + mytheclipse full features
+- http/lib.rs — module + re-export
+- core/lib.rs — pub use RunError, ServiceConfig (needed by http crate)
+- error.rs — RateLimit(String) variant (queue crate, round 6 carryover)
 
-Build: exit 0. Tests: 0 FAILED. Clippy: 0 new warnings.
+## Build: exit 0. Tests: 0 FAILED. Clippy: 0 new warnings.
+
+## Skill created: rust-workspace-abstractions (software-development)
+Captures feature-gating, cross-crate deps, trait/async patterns, ownership patterns, error types, testing conventions for workspace abstraction authoring.

.hermes/plans/mytheclipse-round9-spec.md

@@ -0,0 +1,16 @@
+# Implementation Spec: Round 9 — COMPLETE
+
+## New Feature
+
+### RetryExt (mytheclipse-core, resiliency)
+File: `crates/mytheclipse/src/retry_ext.rs`
+- `RetryExt` trait — `.retry(config, predicate, self_fn)` extension pada Future<Output=Result<T,E>>
+- Delegasi ke `crate::retry::retry`
+- Non-Send Pin<Box<...>> return (single-threaded test OK)
+- 1 test (retries_then_succeeds)
+
+## Files
+- new: retry_ext.rs
+- core/lib.rs: +module +pub use RetryExt
+
+Build: exit 0. Tests: 0 FAILED. Clippy: 0 new warnings.

crates/mytheclipse/src/lib.rs

@@ -34,6 +34,10 @@ pub mod bg;
 #[cfg(feature = "resiliency")]
 pub mod retry;
 #[cfg(feature = "resiliency")]
+pub mod retry_ext;
+#[cfg(feature = "resiliency")]
+pub use retry_ext::RetryExt;
+#[cfg(feature = "resiliency")]
 pub mod circuit_breaker;
 #[cfg(feature = "resiliency")]
 pub mod timeout;

crates/mytheclipse/src/retry_ext.rs

@@ -0,0 +1,72 @@
+//! Ergonomic retry extension trait (feature `resiliency`).
+//!
+//! [`RetryExt`] extends any [`std::future::Future<Output = Result<T, E>>`]
+//! with a `.retry()` method that delegates to [`crate::retry::retry`].
+
+use std::future::Future;
+use std::pin::Pin;
+
+use crate::retry::{retry, RetryConfig, RetryError};
+
+/// Extension trait adding ergonomic `.retry()` to any fallible future.
+pub trait RetryExt<T, E>: Future<Output = Result<T, E>> + Sized + 'static
+where
+    E: std::fmt::Debug + Send + 'static,
+    T: Send + 'static,
+{
+    /// Retries the future's result via a reconstructive `self_fn` closure,
+    /// delegating to [`crate::retry::retry`]. The original future is consumed
+    /// on the first attempt; subsequent attempts use `self_fn()`.
+    fn retry<F, Fut, P>(
+        self,
+        config: RetryConfig,
+        predicate: P,
+        self_fn: F,
+    ) -> Pin<Box<dyn Future<Output = Result<T, RetryError<E>>>>>
+    where
+        F: FnMut() -> Fut + 'static,
+        Fut: Future<Output = Result<T, E>> + 'static,
+        P: Fn(&E) -> bool + 'static,
+    {
+        Box::pin(async move {
+            let _ = self.await;
+            retry(config, predicate, self_fn).await
+        })
+    }
+}
+
+impl<Fut, T, E> RetryExt<T, E> for Fut
+where
+    Fut: Future<Output = Result<T, E>> + Send + 'static,
+    E: std::fmt::Debug + Send + 'static,
+    T: Send + 'static,
+{
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use std::time::Duration;
+    use std::sync::Arc;
+    use std::sync::atomic::{AtomicU32, Ordering};
+
+    #[tokio::test]
+    async fn retry_ext_retries_then_succeeds() {
+        let attempts = Arc::new(AtomicU32::new(0));
+        let a = Arc::clone(&attempts);
+        let cfg = RetryConfig { max_attempts: 3, base_delay: Duration::from_millis(1), ..RetryConfig::default() };
+
+        let op = move || {
+            let a = Arc::clone(&a);
+            async move {
+                let n = a.fetch_add(1, Ordering::SeqCst);
+                if n < 2 { Err::<(), String>("transient".into()) } else { Ok(()) }
+            }
+        };
+
+        let fut = async { Err::<(), String>("first".into()) };
+        let result = fut.retry(cfg, |_: &String| true, op).await;
+        assert!(result.is_ok());
+        assert_eq!(attempts.load(Ordering::SeqCst), 3);
+    }
+}