Draft plan for replacing Tokio + Reqwest with Asupersync, a cancel-correct
async runtime with structured concurrency guarantees.
Motivation:
- Current Ctrl+C during join_all silently drops in-flight HTTP requests
- ShutdownSignal is a hand-rolled AtomicBool with no structured cancellation
- No deterministic testing for concurrent ingestion patterns
- Tokio provides no structured concurrency guarantees
Plan structure:
- Complete inventory of tokio/reqwest usage in production and test code
- Phase 0: Preparation (reduce tokio surface before swap)
- Extract signal handler to single function
- Replace tokio::sync::Mutex with std::sync::Mutex where appropriate
- Create HTTP adapter trait for pluggable backends
- Phase 1-5: Progressive migration with detailed implementation steps
Trade-offs accepted:
- Nightly Rust required (asupersync dependency)
- Pre-1.0 runtime dependency (mitigated by adapter layer + version pinning)
- Deeper function signature changes for Cx threading
This is a reference document for future implementation, not an immediate
change to the runtime.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
