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Everything on screen derives // from a single governing scalar, cable position `s` in [0,1]: the new // version's share IS s, the old version's share IS 1-s (computed as the // complement of the same rounded integer, never rounded independently), car // positions are pointAt(s) / pointAt(1-s) on the same incline, and the // counterweight tilt is (s-0.5) alone. Two independent progress bars simply // cannot exist here — there is nowhere in the geometry for a second number // to live, which is the point: an impossible state (60% new AND 70% old) // cannot be drawn. // // The mid-track passing loop pins s at 0.5 until the canary is confirmed — // the confirm button swings a set of points with a ~200ms mechanical spring // throw; attempting to drag or step past the loop before that bounces both // cars off with a 4px overshoot along the cable, then settles back. Rollback // releases the winch brake and lets s fall back to 0 under a damped // oscillator (zeta 0.85) rather than teleporting or free-falling — heavy // enough that it never slams the lower stop, light enough that it never // reads as reluctant. Reduced motion keeps every position change but strips // the continuous glide: rollback lands in a few discrete jumps instead of a // smooth integration, counters stay correct at every one of them. // // Pure DOM + SVG + CSS. Every ink is a token; --ns-accent is reserved for // the canary-confirm and rollback buttons' own focus rings — nowhere else. // --------------------------------------------------------------------------- export interface PassingLoopProps { /** label for the version climbing toward s=1, e.g. "v2.4.1" */ newVersion?: string; /** label for the version descending toward s=0, e.g. "v2.4.0" */ oldVersion?: string; /** total live requests/interval split by s and its complement */ totalRequests?: number; /** initial cable position, 0..1 (uncontrolled) */ defaultValue?: number; /** fires with the committed cable position on every change */ onValueChange?: (s: number) => void; /** fires once the canary confirm swings the points open */ onCanaryConfirm?: () => void; /** fires once, the instant a rollback begins */ onRollback?: (fromShare: number) => void; ariaLabel?: string; className?: string; } const VIEW_W = 440; const VIEW_H = 200; const STATION_BOTTOM = { x: 58, y: 172 }; const STATION_TOP = { x: 382, y: 32 }; const LOOP_S = 0.5; const LOOP_HALF = 0.075; const LOOP_OFFSET = 10; // px bulge of the passing loop's two rails const BOUNCE_PX = 4; const STEP = 0.05; const OMEGA = 4.2; // rad/s-ish, damped-oscillator natural frequency const ZETA = 0.85; // band-brake damping ratio — the whole point of the spec const REDUCED_STEP_MS = 190; const POINTS_MS = 200; const SPRING_EASE = "cubic-bezier(0.34,1.56,0.64,1)"; // overshoot + settle const GLIDE_MS = 280; const GLIDE_EASE = "cubic-bezier(0.16,1,0.3,1)"; // ease-out-expo 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; } /** point on the single incline at fraction t (0 = base station, 1 = summit) */ function pointAt(t: number) { return { x: STATION_BOTTOM.x + (STATION_TOP.x - STATION_BOTTOM.x) * t, y: STATION_BOTTOM.y + (STATION_TOP.y - STATION_BOTTOM.y) * t, }; } const TRACK_DX = STATION_TOP.x - STATION_BOTTOM.x; const TRACK_DY = STATION_TOP.y - STATION_BOTTOM.y; const TRACK_LEN = Math.hypot(TRACK_DX, TRACK_DY); const UNIT = { x: TRACK_DX / TRACK_LEN, y: TRACK_DY / TRACK_LEN }; const PERP = { x: -UNIT.y, y: UNIT.x }; const TRACK_ANGLE_DEG = (Math.atan2(UNIT.y, UNIT.x) * 180) / Math.PI; export function PassingLoop({ newVersion = "v2.4.1", oldVersion = "v2.4.0", totalRequests = 24000, defaultValue = 0.5, onValueChange, onCanaryConfirm, onRollback, ariaLabel = "Rollout traffic control", className = "", }: PassingLoopProps) { const uid = useId(); const reduced = useReducedMotion(); const [s, setSState] = useState(() => clamp(defaultValue, 0, 1)); const sRef = useRef(s); const [canaryConfirmed, setCanaryConfirmed] = useState(false); const [dragging, setDragging] = useState(false); const [rollingBack, setRollingBack] = useState(false); const [bounceNonce, setBounceNonce] = useState(0); const [politeMsg, setPoliteMsg] = useState(""); const [assertiveMsg, setAssertiveMsg] = useState(""); const wrapperRef = useRef(null); const velocityRef = useRef(0); const rafRef = useRef(undefined); const intervalRef = useRef(undefined); const lastTimeRef = useRef(0); const draggingRef = useRef(false); const lastBounceRef = useRef(0); useEffect( () => () => { if (rafRef.current !== undefined) cancelAnimationFrame(rafRef.current); window.clearInterval(intervalRef.current); }, [] ); function commitS(next: number) { const bounded = clamp(next, 0, 1); sRef.current = bounded; setSState(bounded); onValueChange?.(bounded); } function attemptSet(requested: number) { const cap = canaryConfirmed ? 1 : LOOP_S; const clamped = clamp(requested, 0, 1); const bounded = Math.min(clamped, cap); if (clamped > cap + 1e-6 && !reduced) { // one overshoot-and-settle per attempt, never a buzz — a held drag or // a key held down fires attemptSet many times a second, but the 220ms // keyframe below must be allowed to finish before it can restart const now = performance.now(); if (now - lastBounceRef.current > 240) { lastBounceRef.current = now; setBounceNonce((n) => n + 1); } } commitS(bounded); } function updateFromPointer(clientX: number) { const el = wrapperRef.current; if (!el || el.clientWidth <= 0) return; const rect = el.getBoundingClientRect(); const t = (clientX - rect.left) / rect.width; attemptSet(clamp(t, 0, 1)); } function handlePointerDown(e: React.PointerEvent) { if (rollingBack) return; const el = wrapperRef.current; el?.setPointerCapture(e.pointerId); el?.focus({ preventScroll: true }); draggingRef.current = true; setDragging(true); updateFromPointer(e.clientX); } function handlePointerMove(e: React.PointerEvent) { if (!draggingRef.current) return; updateFromPointer(e.clientX); } function endDrag() { draggingRef.current = false; setDragging(false); } function handleKeyDown(e: React.KeyboardEvent) { if (rollingBack) return; switch (e.key) { case "ArrowRight": case "ArrowUp": e.preventDefault(); attemptSet(sRef.current + STEP); return; case "ArrowLeft": case "ArrowDown": e.preventDefault(); attemptSet(sRef.current - STEP); return; case "Home": e.preventDefault(); attemptSet(0); return; case "End": e.preventDefault(); attemptSet(canaryConfirmed ? 1 : LOOP_S); return; case "Enter": if (Math.abs(sRef.current - LOOP_S) < 1e-6 && !canaryConfirmed) { e.preventDefault(); handleConfirm(); } return; default: return; } } function handleConfirm() { if (canaryConfirmed) return; // idempotent — an earlier press already threw the points setCanaryConfirmed(true); setPoliteMsg(`Canary confirmed. Points open — rollout can continue past the loop.`); onCanaryConfirm?.(); } function finishRollback() { if (rafRef.current !== undefined) cancelAnimationFrame(rafRef.current); window.clearInterval(intervalRef.current); rafRef.current = undefined; intervalRef.current = undefined; velocityRef.current = 0; commitS(0); setRollingBack(false); setCanaryConfirmed(false); setAssertiveMsg(`Rolled back. 0% on ${newVersion}, 100% on ${oldVersion}.`); } function physicsStep(now: number) { const dt = Math.min(0.032, (now - lastTimeRef.current) / 1000 || 0.016); lastTimeRef.current = now; const accel = -(OMEGA * OMEGA) * sRef.current - 2 * ZETA * OMEGA * velocityRef.current; velocityRef.current += accel * dt; let next = sRef.current + velocityRef.current * dt; if (next <= 0.0015 && Math.abs(velocityRef.current) < 0.012) { finishRollback(); return; } if (next < 0) next = 0; // hard lower stop — already slow here, no bounce needed sRef.current = next; setSState(next); rafRef.current = requestAnimationFrame(physicsStep); } function handleRollback() { if (rollingBack) return; // real button, but a fall already in progress is a no-op replay if (sRef.current <= 0 && !canaryConfirmed) return; // already fully settled at old draggingRef.current = false; setDragging(false); setRollingBack(true); velocityRef.current = 0; setAssertiveMsg( `Rolling back, ${Math.round(sRef.current * 100)}% on new version and falling.` ); onRollback?.(sRef.current); if (reduced) { intervalRef.current = window.setInterval(() => { const next = sRef.current < 0.02 ? 0 : sRef.current * 0.4; if (next <= 0) { finishRollback(); return; } sRef.current = next; setSState(next); }, REDUCED_STEP_MS); } else { lastTimeRef.current = performance.now(); rafRef.current = requestAnimationFrame(physicsStep); } } // -- everything below derives from s alone -- const newPct = Math.round(s * 100); const oldPct = 100 - newPct; // complement of the SAME rounded number — never independently rounded const newCount = Math.round(totalRequests * s); const oldCount = totalRequests - newCount; // same complement guarantee // a bezier's midpoint sits halfway to its control point, so a car riding // the rail at t needs half the rail's own control-point offset, tapering // to 0 outside the loop span — this is what actually keeps the two cars // visibly apart on separate rails while they cross, rather than drawing a // loop that never carries anything. function railOffset(t: number) { const d = Math.abs(t - LOOP_S); return d >= LOOP_HALF ? 0 : (LOOP_OFFSET / 2) * (1 - d / LOOP_HALF); } const newBase = pointAt(s); const oldBase = pointAt(1 - s); const newRail = railOffset(s); const oldRail = railOffset(1 - s); const newPos = { x: newBase.x + PERP.x * newRail, y: newBase.y + PERP.y * newRail }; const oldPos = { x: oldBase.x - PERP.x * oldRail, y: oldBase.y - PERP.y * oldRail }; const loopStart = pointAt(LOOP_S - LOOP_HALF); const loopEnd = pointAt(LOOP_S + LOOP_HALF); const loopMid = pointAt(LOOP_S); const railACtl = { x: loopMid.x + PERP.x * LOOP_OFFSET, y: loopMid.y + PERP.y * LOOP_OFFSET }; const railBCtl = { x: loopMid.x - PERP.x * LOOP_OFFSET, y: loopMid.y - PERP.y * LOOP_OFFSET }; const railAD = `M ${loopStart.x} ${loopStart.y} Q ${railACtl.x} ${railACtl.y} ${loopEnd.x} ${loopEnd.y}`; const railBD = `M ${loopStart.x} ${loopStart.y} Q ${railBCtl.x} ${railBCtl.y} ${loopEnd.x} ${loopEnd.y}`; const pointsAngle = TRACK_ANGLE_DEG + (canaryConfirmed ? 0 : 90); const tiltDeg = (s - 0.5) * 24; const pivot = { x: STATION_BOTTOM.x, y: STATION_BOTTOM.y + 16 }; const carTransition = reduced || dragging || rollingBack ? "none" : `transform ${GLIDE_MS}ms ${GLIDE_EASE}`; const describeId = `${uid}-desc`; const valueText = `${newPct}% on ${newVersion}, ${oldPct}% on ${oldVersion}`; const statusText = rollingBack ? "rolling back" : canaryConfirmed ? "past the loop" : Math.abs(s - LOOP_S) < 1e-6 ? "parked at the loop, canary pending" : "climbing to the loop"; return (

{`Traffic split, ${statusText}. Arrow keys step 5 percent. Enter confirms canary while parked at the loop.`}

{newVersion} · {newCount.toLocaleString()} req {oldVersion} · {oldCount.toLocaleString()} req

{politeMsg}

{assertiveMsg}

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