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Stages are // protection anchors bolted along a vertical SVG line; the current deploy is // the climber-end of a rope clipped through every passed anchor. The segment // between the last clipped anchor and the leader bows with a quadratic // bezier control offset of `headroom * 24px` (24px at 96px stage spacing // reads as slack; the same offset never exceeds 28px, past which the curve // would cross its own anchor line and stop reading as clipped through) — so // headroom approaching 0 pulls the rope visibly taut before an automated // abort fires. Advancement is a linear climb on ease-out-expo; passing an // anchor clips through with a one-frame carabiner-ring flash, no per-stage // celebration. ARREST (fall arrest / rollback) is computed only as the // greatest passed anchor and is a single translate of the leader there, with // one overshoot-and-settle spring on the leader — never a stage-by-stage // reverse walk, because a rollback is not a tidy reverse deploy and // animating it as one teaches a false mental model. The catch itself also // draws a second, dashed rope segment pinned taut (the same 28px hard-capped // bow as the live rope) between the target anchor and where the leader fell // from, fading out over the spring's own duration as it settles — the rope // visibly taking the load, not just a dot relocating. Pure DOM + SVG + CSS, // every ink a token, no canvas. // --------------------------------------------------------------------------- export type BelayStageStatus = "pending" | "active" | "passed" | "failed"; export interface BelayStage { /** stable id, also what onArrest reports back */ id: string; /** short stage name, e.g. "build", "canary", "10%" */ label: string; status: BelayStageStatus; /** shown next to the stage and read out in the arrest target description */ timestamp?: string; } export interface RunningBelayProps { /** pipeline stages, bottom of the pitch to the top — e.g. build..canary..100% */ stages: BelayStage[]; /** 0..1 aggregated canary-health margin; drives how much the live rope bows */ headroom: number; /** fires with the stage id the arrest fell back to */ onArrest?: (targetStageId: string) => void; /** accessible name for the pipeline group */ ariaLabel?: string; className?: string; } const SPACING = 96; // px between anchors const RAIL_W = 40; // px, the SVG rail column const LINE_X = RAIL_W / 2; const ANCHOR_R = 5; const BOW_MAX = 24; // px, at headroom = 1 const BOW_CAP = 28; // px, hard ceiling — past this the curve crosses the line const CLIMB_MS = 600; const CLIMB_EASE = "cubic-bezier(0.16,1,0.3,1)"; // ease-out-expo const SPRING_MS = 700; const SPRING_EASE = "cubic-bezier(0.34,1.56,0.64,1)"; // overshoot + settle const CLIP_FLASH_MS = 150; const ARREST_FLASH_MS = 500; function clamp(v: number, lo: number, hi: number) { return Math.min(hi, Math.max(lo, v)); } function useReducedMotion() { const [reduced, setReduced] = useState(false); useEffect(() => { const mq = window.matchMedia("(prefers-reduced-motion: reduce)"); setReduced(mq.matches); const on = () => setReduced(mq.matches); mq.addEventListener("change", on); return () => mq.removeEventListener("change", on); }, []); return reduced; } /** the frontmost stage the deploy is currently at — the active one, or the * furthest passed stage once nothing is active */ function naturalLeaderIndex(stages: BelayStage[]): number { const active = stages.findIndex((s) => s.status === "active"); if (active !== -1) return active; let idx = 0; stages.forEach((s, i) => { if (s.status === "passed") idx = i; }); return idx; } /** the arrest target: the greatest passed anchor, full stop. -1 if none. */ function greatestPassedIndex(stages: BelayStage[]): number { let idx = -1; stages.forEach((s, i) => { if (s.status === "passed" && i > idx) idx = i; }); return idx; } export function RunningBelay({ stages, headroom, onArrest, ariaLabel = "Deploy pipeline", className = "", }: RunningBelayProps) { const uid = useId(); const reduced = useReducedMotion(); const n = stages.length; const totalH = Math.max(1, n) * SPACING; const natural = naturalLeaderIndex(stages); const lastPassed = greatestPassedIndex(stages); // arrestedIdx is a local, optimistic override — released the moment the // caller's own stages prop confirms the deploy is actually back there. const [arrestedIdx, setArrestedIdx] = useState(null); const [springOn, setSpringOn] = useState(false); const springTimeout = useRef(undefined); // the leader's position the instant BEFORE a fall — kept only for the // duration of the spring, so the catch has a rope to show the load on. const [fallFromIdx, setFallFromIdx] = useState(null); const [fallFading, setFallFading] = useState(false); const fallFadeFrame = useRef(undefined); const [arrestFlashIdx, setArrestFlashIdx] = useState(null); const arrestFlashTimeout = useRef(undefined); const [assertiveMsg, setAssertiveMsg] = useState(""); useEffect(() => { if (arrestedIdx !== null && natural === arrestedIdx) setArrestedIdx(null); }, [natural, arrestedIdx]); const leaderIndex = arrestedIdx ?? natural; // polite announcement whenever a stage's own status changes const prevStages = useRef(stages); const [politeMsg, setPoliteMsg] = useState(""); useEffect(() => { const prev = prevStages.current; prevStages.current = stages; if (prev === stages) return; for (let i = 0; i < stages.length; i++) { const p = prev[i]; const s = stages[i]; if (p && s && p.status !== s.status) { setPoliteMsg(`${s.label} is now ${s.status}${s.timestamp ? `, ${s.timestamp}` : ""}.`); } } }, [stages]); // one-frame carabiner-ring flash the instant an anchor newly becomes passed const passedSeen = useRef>(new Set()); const [clipFlashIdx, setClipFlashIdx] = useState(null); const clipFlashTimeout = useRef(undefined); useEffect(() => { const prevSeen = passedSeen.current; const nextSeen = new Set(); let fresh: number | null = null; stages.forEach((s, i) => { if (s.status === "passed") { nextSeen.add(i); if (!prevSeen.has(i)) fresh = i; } }); passedSeen.current = nextSeen; if (fresh !== null && !reduced) { setClipFlashIdx(fresh); window.clearTimeout(clipFlashTimeout.current); clipFlashTimeout.current = window.setTimeout(() => setClipFlashIdx(null), CLIP_FLASH_MS); } }, [stages, reduced]); useEffect( () => () => { window.clearTimeout(springTimeout.current); window.clearTimeout(arrestFlashTimeout.current); window.clearTimeout(clipFlashTimeout.current); window.cancelAnimationFrame(fallFadeFrame.current ?? -1); }, [] ); const targetStage = lastPassed >= 0 ? stages[lastPassed] : null; function handleArrest() { if (lastPassed < 0 || !targetStage) return; const fellFrom = reduced ? null : leaderIndex; setFallFromIdx(fellFrom); setFallFading(false); window.cancelAnimationFrame(fallFadeFrame.current ?? -1); if (fellFrom !== null) { // mount the taut catch-rope at full opacity, then flip to the CSS // transition target on the next frame so it fades out OVER the // spring's duration rather than vanishing with it. fallFadeFrame.current = window.requestAnimationFrame(() => setFallFading(true)); } setArrestedIdx(lastPassed); setSpringOn(true); window.clearTimeout(springTimeout.current); springTimeout.current = window.setTimeout(() => { setSpringOn(false); setFallFromIdx(null); setFallFading(false); }, SPRING_MS); setArrestFlashIdx(lastPassed); window.clearTimeout(arrestFlashTimeout.current); arrestFlashTimeout.current = window.setTimeout(() => setArrestFlashIdx(null), ARREST_FLASH_MS); setAssertiveMsg( `Arrested. Rolled back to ${targetStage.label} cohort, deployed ${targetStage.timestamp ?? "unknown time"}.` ); onArrest?.(targetStage.id); } const describeId = `${uid}-target`; const targetDesc = lastPassed < 0 || !targetStage ? "No healthy checkpoint recorded yet — arrest has nothing to fall back to." : `Rolls back to ${targetStage.label} cohort, deployed ${targetStage.timestamp ?? "unknown time"}.`; const yFor = (i: number) => i * SPACING + SPACING / 2; const solidSegments: Array<{ y0: number; y1: number }> = []; for (let i = 0; i < n - 1; i++) { if (stages[i]?.status === "passed" && stages[i + 1]?.status === "passed") { solidSegments.push({ y0: yFor(i), y1: yFor(i + 1) }); } } const showLive = lastPassed >= 0 && leaderIndex > lastPassed; const bowOffset = reduced ? 0 : clamp(clamp(headroom, 0, 1) * BOW_MAX, 0, BOW_CAP); const liveY0 = lastPassed >= 0 ? yFor(lastPassed) : 0; const liveY1 = yFor(leaderIndex); const liveMidY = (liveY0 + liveY1) / 2; const liveD = `M ${LINE_X} ${liveY0} Q ${LINE_X + bowOffset} ${liveMidY} ${LINE_X} ${liveY1}`; // the catch-rope: only exists for the SPRING_MS of an arrest, pinned // between the target anchor and where the leader fell from, bowed to the // same hard-capped 28px — the rope taking the full load, then fading as // it settles. Never drawn under reduced motion (fallFromIdx stays null). const fallD = fallFromIdx !== null && fallFromIdx > lastPassed ? (() => { const y0 = yFor(lastPassed); const y1 = yFor(fallFromIdx); const midY = (y0 + y1) / 2; return `M ${LINE_X} ${y0} Q ${LINE_X + BOW_CAP} ${midY} ${LINE_X} ${y1}`; })() : null; const leaderTransition = reduced ? "none" : `transform ${springOn ? SPRING_MS : CLIMB_MS}ms ${springOn ? SPRING_EASE : CLIMB_EASE}`; return (

{s.label} {s.status} {s.timestamp ? ` · ${s.timestamp}` : ""}

headroom {Math.round(clamp(headroom, 0, 1) * 100)}%

{targetDesc}

{politeMsg}

{assertiveMsg}

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