altair823
6260df5b30
회차 1 actionable 2건 반영 + 1건 (CLI Ctrl-C integration test) 은 본 PR 에서 별도 task 로 미룸 (signal handler subprocess test 의 flaky 위험 + facade 3 PASS + tui lib 3 PASS 가 안정 surface). - cancel.rs::install_sigint_cancel: SIGNAL_COUNT 위에 process-lifetime invariant 코멘트 — multi-install 차단 (ctrlc::set_handler) 덕분에 reset 불필요. 미래 다중 caller 가 같은 cancel token 공유하려면 install 함수 분리 필요. - ingest_cancel.rs::cancel_mid_loop: redundant `report.new == 1 || 0 || 2` 제거, race timing 의도 코멘트로 대체 (0=listener 승, 1=first only, 2=extra slipped in 모두 valid; 3 = cancel never propagated = 유일한 fail). Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
84 lines
3.7 KiB
Rust
84 lines
3.7 KiB
Rust
//! `kebab ingest` SIGINT (Ctrl-C) handler — flips a shared
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//! `Arc<AtomicBool>` so `kebab_app::ingest_with_config_cancellable`
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//! can break at the next step boundary.
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//!
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//! Per spec §10: the second Ctrl-C is a hard exit (130 = SIGINT
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//! conventional). We count signal arrivals via a private atomic and
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//! call `std::process::exit` on the second arrival — past the point
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//! where the user has signalled both "let me out gracefully" and
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//! "no, really, get me out now". This sidesteps the indicatif
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//! cleanup path; the terminal may be left in a slightly odd state
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//! after a hard exit, which is the acceptable tradeoff for "really
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//! exit now".
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//!
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//! `ctrlc` is the only cross-platform SIGINT helper that doesn't
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//! drag in a tokio runtime; it registers a single OS-level handler
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//! per process. Because the handler is process-global, calling
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//! `install` more than once per `kebab` invocation is forbidden
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//! (would clobber the previous handler) — `Cmd::Ingest` is the only
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//! caller today, but a future `kebab eval run` etc. would need to
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//! either share the same atomic or deliberately re-install before
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//! its run begins.
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use std::sync::Arc;
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use std::sync::atomic::{AtomicBool, AtomicU8, Ordering};
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/// Install a SIGINT handler that:
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/// - on first signal: sets `cancel.store(true)` so the cooperative
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/// cancel loop in `kebab_app::ingest_with_config_cancellable`
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/// breaks at its next step boundary.
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/// - on second signal: hard-exits with code 130 (SIGINT
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/// convention).
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///
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/// Returns the same `Arc<AtomicBool>` for the caller to thread
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/// through to the facade. Errors only on duplicate install; first
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/// caller wins.
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pub fn install_sigint_cancel() -> anyhow::Result<Arc<AtomicBool>> {
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let cancel = Arc::new(AtomicBool::new(false));
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let cancel_for_handler = cancel.clone();
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// Per-process count of received SIGINTs. Static so the closure
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// owns no extra state; first signal flips cancel, second exits.
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//
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// Process-lifetime: never reset. ctrlc::set_handler rejects
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// multi-install with `Err(MultipleHandlers)`, so this counter
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// is effectively single-use per `kebab` invocation. A future
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// command that needs its own cancel token (e.g. `kebab eval
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// run --with-cancel`) must factor the install path into a
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// helper that takes the token as an arg and shares it across
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// callers — not call `install_sigint_cancel` twice.
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static SIGNAL_COUNT: AtomicU8 = AtomicU8::new(0);
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ctrlc::set_handler(move || {
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let prev = SIGNAL_COUNT.fetch_add(1, Ordering::Relaxed);
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if prev == 0 {
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cancel_for_handler.store(true, Ordering::Relaxed);
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// Helpful hint on stderr — the run loop will surface
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// its own "aborting…" line once the cancel propagates.
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let _ = std::io::Write::write_all(
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&mut std::io::stderr().lock(),
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b"\nreceived Ctrl-C; aborting after current asset (press again to force quit)\n",
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);
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} else {
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// Second signal → bail. 130 is the canonical SIGINT
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// exit code (128 + signal number).
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std::process::exit(130);
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}
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})?;
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Ok(cancel)
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}
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#[cfg(test)]
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mod tests {
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// The handler is process-global and can only be installed once
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// per binary invocation (ctrlc constraint), so unit-testing the
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// happy path here is brittle — see `tests/ingest_cancel_cli.rs`
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// for the integration coverage that runs the bin in a fresh
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// subprocess.
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#[test]
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fn cancel_module_compiles() {
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// Trivial sanity — confirm the module compiles in dev profile
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// (the install function is exercised by the CLI integration
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// test, not directly here).
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}
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}
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