| 1 | import { useEffect, type RefObject } from "react"; |
| 2 | |
| 3 | const STALE_TURN_RECONCILE_MS = 30_000; |
| 4 | |
| 5 | export type StaleTurnWatchdogState = { |
| 6 | running: boolean; |
| 7 | turnStartAt: number; |
| 8 | }; |
| 9 | |
| 10 | export function shouldReconcileStaleTurn( |
| 11 | state: StaleTurnWatchdogState | undefined, |
| 12 | lastTurnActivityAt: number, |
| 13 | now = Date.now(), |
| 14 | timeoutMs = STALE_TURN_RECONCILE_MS, |
| 15 | ): boolean { |
| 16 | const lastEvidenceAt = lastTurnActivityAt > 0 ? lastTurnActivityAt : state?.turnStartAt ?? 0; |
| 17 | if (!state?.running || lastEvidenceAt <= 0) return false; |
| 18 | return Math.max(0, now - lastEvidenceAt) >= timeoutMs; |
| 19 | } |
| 20 | |
| 21 | export function useStaleTurnWatchdog<T extends StaleTurnWatchdogState>({ |
| 22 | tabId, |
| 23 | visibleState, |
| 24 | activeTabIdRef, |
| 25 | statesRef, |
| 26 | lastTurnActivityAtByTab, |
| 27 | reconcile, |
| 28 | }: { |
| 29 | tabId?: string; |
| 30 | visibleState: StaleTurnWatchdogState; |
| 31 | activeTabIdRef: RefObject<string | undefined>; |
| 32 | statesRef: RefObject<Map<string, T>>; |
| 33 | lastTurnActivityAtByTab: RefObject<Map<string, number>>; |
| 34 | reconcile: (tabId: string) => Promise<void>; |
| 35 | }) { |
| 36 | useEffect(() => { |
| 37 | if (!tabId) return; |
| 38 | let cancelled = false; |
| 39 | let timer: number | undefined; |
| 40 | |
| 41 | const schedule = (delay?: number) => { |
| 42 | if (cancelled || activeTabIdRef.current !== tabId) return; |
| 43 | const current = statesRef.current.get(tabId); |
| 44 | const lastActivityAt = lastTurnActivityAtByTab.current.get(tabId) ?? 0; |
| 45 | const lastEvidenceAt = lastActivityAt > 0 ? lastActivityAt : current?.turnStartAt ?? 0; |
| 46 | if (!current?.running || lastEvidenceAt <= 0) return; |
| 47 | const nextDelay = delay ?? Math.max(0, STALE_TURN_RECONCILE_MS - Math.max(0, Date.now() - lastEvidenceAt)); |
| 48 | timer = window.setTimeout(() => { void tick(); }, nextDelay); |
| 49 | }; |
| 50 | |
| 51 | const tick = async () => { |
| 52 | if (cancelled || activeTabIdRef.current !== tabId) return; |
| 53 | const current = statesRef.current.get(tabId); |
| 54 | const lastActivityAt = lastTurnActivityAtByTab.current.get(tabId) ?? 0; |
| 55 | if (!shouldReconcileStaleTurn(current, lastActivityAt)) { |
| 56 | schedule(); |
| 57 | return; |
| 58 | } |
| 59 | await reconcile(tabId); |
| 60 | if (!cancelled && activeTabIdRef.current === tabId && statesRef.current.get(tabId)?.running) { |
| 61 | schedule(STALE_TURN_RECONCILE_MS); |
| 62 | } |
| 63 | }; |
| 64 | |
| 65 | schedule(); |
| 66 | return () => { |
| 67 | cancelled = true; |
| 68 | if (timer !== undefined) window.clearTimeout(timer); |
| 69 | }; |
| 70 | }, [activeTabIdRef, lastTurnActivityAtByTab, reconcile, statesRef, tabId, visibleState.running, visibleState.turnStartAt]); |
| 71 | } |
| 72 |