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| 1 | +// Recovers from stale-deploy asset failures. Documents reference |
| 2 | +// content-hashed /build assets that exist only in the image that rendered |
| 3 | +// them; during a rolling deploy a client can hold HTML whose asset URLs 404 |
| 4 | +// on the new image (unstyled page, dead buttons from partial hydration). |
| 5 | +// This inline script force-reloads (at most twice, 30s apart, so a |
| 6 | +// persistently blocked asset can't cause a reload loop) so the client picks |
| 7 | +// up the current build instead of sitting broken. Must render before <Links /> so the |
| 8 | +// listener is installed before the stylesheet can fail. |
| 9 | +const script = `(function () { |
| 10 | + var KEY = "trigger:assetReload"; |
| 11 | + var MIN_INTERVAL = 30000; |
| 12 | + var RESET_AFTER = 300000; |
| 13 | + var MAX_ATTEMPTS = 2; |
| 14 | + var scheduled = false; |
| 15 | + function reload() { |
| 16 | + if (scheduled) return; |
| 17 | + try { |
| 18 | + var state = JSON.parse(sessionStorage.getItem(KEY) || "{}"); |
| 19 | + var elapsed = Date.now() - (state.t || 0); |
| 20 | + var attempts = elapsed > RESET_AFTER ? 0 : state.n || 0; |
| 21 | + if (attempts >= MAX_ATTEMPTS) return; |
| 22 | + // Asset failures fire once, at page load — inside the min interval when |
| 23 | + // this is already a reloaded page. Delay the retry instead of dropping |
| 24 | + // it, so a still-in-progress deploy gets time to finish. |
| 25 | + var wait = Math.max(0, MIN_INTERVAL - elapsed); |
| 26 | + sessionStorage.setItem(KEY, JSON.stringify({ t: Date.now() + wait, n: attempts + 1 })); |
| 27 | + scheduled = true; |
| 28 | + setTimeout(function () { |
| 29 | + location.reload(); |
| 30 | + }, wait); |
| 31 | + } catch (e) { |
| 32 | + return; |
| 33 | + } |
| 34 | + } |
| 35 | + window.addEventListener( |
| 36 | + "error", |
| 37 | + function (event) { |
| 38 | + var el = event.target; |
| 39 | + if (!el || el === window) return; |
| 40 | + var url = el.tagName === "LINK" ? el.href : el.tagName === "SCRIPT" ? el.src : null; |
| 41 | + if (url && url.indexOf("/build/") !== -1) reload(); |
| 42 | + }, |
| 43 | + true |
| 44 | + ); |
| 45 | + window.addEventListener("unhandledrejection", function (event) { |
| 46 | + var message = event.reason && event.reason.message; |
| 47 | + if ( |
| 48 | + typeof message === "string" && |
| 49 | + /dynamically imported module|Importing a module script failed|ChunkLoadError/i.test(message) |
| 50 | + ) { |
| 51 | + reload(); |
| 52 | + } |
| 53 | + }); |
| 54 | +})();`; |
| 55 | + |
| 56 | +export function StaleAssetRecovery() { |
| 57 | + if (process.env.NODE_ENV !== "production") { |
| 58 | + return null; |
| 59 | + } |
| 60 | + |
| 61 | + return <script dangerouslySetInnerHTML={{ __html: script }} />; |
| 62 | +} |
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