shellphone.app/app/service-worker/cache-utils.ts

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import { json } from "@remix-run/server-runtime";
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export const ASSET_CACHE = "asset-cache";
export const DATA_CACHE = "data-cache";
export const DOCUMENT_CACHE = "document-cache";
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export function isAssetRequest(request: Request) {
return ["font", "image", "script", "style"].includes(request.destination);
}
export function isLoaderRequest(request: Request) {
const url = new URL(request.url);
return request.method.toLowerCase() === "get" && url.searchParams.get("_data");
}
export function isDocumentGetRequest(request: Request) {
return request.method.toLowerCase() === "get" && request.mode === "navigate";
}
export function cacheAsset(event: FetchEvent): Promise<Response> {
// stale-while-revalidate
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const url = new URL(event.request.url);
return caches
.match(event.request, {
cacheName: ASSET_CACHE,
ignoreVary: true,
ignoreSearch: true,
})
.then((cachedResponse) => {
console.debug(`Serving asset from ${cachedResponse ? "cache" : " network"}`, url.pathname);
const fetchPromise = event.preloadResponse
.then((preloadedResponse?: Response) => preloadedResponse || fetch(event.request.clone()))
.then((response) =>
caches.open(ASSET_CACHE).then((cache) => {
switch (response.status) {
case 200:
cache.put(event.request, response.clone());
break;
case 404:
cache.delete(event.request);
break;
}
return response;
}),
);
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return cachedResponse || fetchPromise;
});
}
// stores the timestamp for when each URL's cached response has been revalidated
const lastTimeRevalidated: Record<string, number> = {};
export function cacheLoaderData(event: FetchEvent): Promise<Response> {
/*if (searchParams.get("_refresh") === "groot") {
console.debug("Serving refreshed data from network", url.pathname + url.search);
return event.preloadResponse
.then((preloadedResponse?: Response) => preloadedResponse || fetch(event.request.clone()))
.then((response) =>
caches
.open(DATA_CACHE)
.then((cache) => cache.put(event.request, response.clone()))
.then(() =>
response
.clone()
.json()
.then(({ json }) => console.debug("ddd", json?.phoneCalls?.[0]?.recipient)),
)
.then(() => {
console.debug("returned latest", Date.now());
return response;
}),
)
.catch(() => {
console.debug("Serving data from network failed, falling back to cache", url.pathname + url.search);
return caches.match(url).then((response) => {
if (!response) {
return json(
{ message: "Network Error" },
{
status: 500,
headers: { "X-Remix-Catch": "yes", "X-Remix-Worker": "yes" },
},
);
}
response.headers.set("X-Remix-Worker", "yes");
return response;
});
});
}*/
/*return caches.match(event.request, { cacheName: DATA_CACHE }).then((cachedResponse) => {
console.debug(`Serving data from ${cachedResponse ? "cache" : "network"}`, url.pathname + url.search);
cachedResponse?.headers.set("X-Remix-Worker", "yes");
const fetchPromise = event.preloadResponse
.then((preloadedResponse?: Response) => preloadedResponse || fetch(event.request.clone()))
.then((response) =>
caches.open(DATA_CACHE).then((cache) => {
response.text().then(rrr => console.log(response.ok, url.pathname + url.search, rrr));
if (!response.ok) {
return json(
{ message: "Network Error" },
{
status: 500,
headers: { "X-Remix-Catch": "yes", "X-Remix-Worker": "yes" },
},
);
}
cache.put(event.request, response.clone());
const timestamp = lastTimeResponded[url.pathname + url.search];
console.log("timestamp - Date.now()", Date.now() - timestamp);
/!*if (timestamp && (Date.now() - timestamp > 10 * 1000)) {
console.debug("update UI with latest", Date.now());
// we already returned the cached response
// we need to update the UI with the latest data
const message = {
type: "revalidateLoaderData",
// href: url.pathname + "?_refresh=groot",
};
const channel = new BroadcastChannel("sw-messages");
channel.postMessage(JSON.stringify(message));
}*!/
return response;
}),
);
if (cachedResponse) {
console.debug("returned cached", Date.now());
lastTimeResponded[url.pathname + url.search] = Date.now();
}
return fetchPromise.then(response => {
console.debug("returned networked", Date.now());
lastTimeResponded[url.pathname + url.search] = Date.now();
return response;
})
});*/
const url = new URL(event.request.url);
const path = url.pathname + url.search;
return caches.match(event.request, { cacheName: DATA_CACHE }).then((cachedResponse) => {
console.debug(`Serving data from ${cachedResponse ? "cache" : "network"}`, path);
cachedResponse?.headers.set("X-Remix-Worker", "yes");
const timestamp = lastTimeRevalidated[path] ?? 0;
const diff = Date.now() - timestamp;
const TEN_SECONDS = 10 * 1000;
if (cachedResponse && diff < TEN_SECONDS) {
console.debug("Returned response from cache after a revalidation no older than 10s");
// TODO: see if we can check a header or something to see if the requests comes from the revalidation thing
return cachedResponse;
}
const fetchPromise = event.preloadResponse
.then((preloadedResponse?: Response) => preloadedResponse || fetch(event.request.clone()))
.then((response) =>
caches.open(DATA_CACHE).then((cache) => {
if (!response.ok) {
return json(
{ message: "Network Error" },
{
status: 500,
headers: { "X-Remix-Catch": "yes", "X-Remix-Worker": "yes" },
},
);
}
const clonedResponse = response.clone();
cache.match(event.request).then(async (cached) => {
if (!cached) {
// we had nothing cached, simply cache what we got
await cache.put(event.request, clonedResponse.clone());
return;
}
if (await areResponsesEqual(cached.clone(), clonedResponse.clone())) {
// if what we have in the cache is up-to-date, we don't have to do anything
console.debug("Responses are the same, no need to revalidate", path);
return;
}
// otherwise, cache the new response
await cache.put(event.request, clonedResponse.clone());
if (cachedResponse) {
// and if we had returned a cached response
// tell the UI to fetch the latest data
console.debug("Revalidate loader data", path);
const channel = new BroadcastChannel("sw-messages");
channel.postMessage("revalidateLoaderData");
lastTimeRevalidated[path] = Date.now();
}
});
return response;
}),
);
return cachedResponse || fetchPromise;
});
}
async function areResponsesEqual(a: Response, b: Response): Promise<boolean> {
const viewA = new DataView(await a.arrayBuffer());
const viewB = new DataView(await b.arrayBuffer());
if (viewA === viewB) {
return true;
}
if (viewA.byteLength !== viewB.byteLength) {
return false;
}
let i = viewA.byteLength;
while (i--) {
if (viewA.getUint8(i) !== viewB.getUint8(i)) {
return false;
}
}
return true;
}
export function cacheDocument(event: FetchEvent): Promise<Response> {
// network-first
const url = new URL(event.request.url);
console.debug("Serving document from network", url.pathname);
return caches.open(DOCUMENT_CACHE).then((cache) =>
fetch(event.request.clone())
.then((response) => {
cache.put(event.request, response.clone());
return response;
})
.catch((error) => {
console.debug("Serving document from network failed, falling back to cache", url.pathname);
return caches.match(event.request).then((response) => {
if (!response) {
throw error;
}
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return response;
});
}),
);
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}
export async function deleteCaches() {
console.debug("Caches deleted");
const allCaches = await caches.keys();
await Promise.all(allCaches.map((cacheName) => caches.delete(cacheName)));
}