@expo/cli
Version:
76 lines (75 loc) • 2.59 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", {
value: true
});
Object.defineProperty(exports, "wrapFetchWithCache", {
enumerable: true,
get: function() {
return wrapFetchWithCache;
}
});
function _undici() {
const data = require("undici");
_undici = function() {
return data;
};
return data;
}
const _ResponseCache = require("./ResponseCache");
const debug = require('debug')('expo:undici-cache');
function wrapFetchWithCache(fetch, cache) {
return async function cachedFetch(url, init) {
const cacheKey = (0, _ResponseCache.getRequestCacheKey)(url, init);
const cachedResponse = await cache.get(cacheKey);
if (cachedResponse) {
return new (_undici()).Response(cachedResponse.body, cachedResponse.info);
}
await lock(cacheKey);
try {
// Retry loading from cache, in case it was stored during the lock
let cachedResponse = await cache.get(cacheKey);
if (cachedResponse) {
return new (_undici()).Response(cachedResponse.body, cachedResponse.info);
}
// Execute the fetch request
const response = await fetch(url, init);
if (!response.ok || !response.body) {
return response;
}
// Cache the response
cachedResponse = await cache.set(cacheKey, {
body: response.body,
info: (0, _ResponseCache.getResponseInfo)(response)
});
// Warn through debug logs that caching failed
if (!cachedResponse) {
debug(`Failed to cache response for: ${url}`);
await cache.remove(cacheKey);
return response;
}
// Return the cached response
return new (_undici()).Response(cachedResponse.body, cachedResponse.info);
} finally{
unlock(cacheKey);
}
};
}
const lockPromiseForKey = {};
const unlockFunctionForKey = {};
async function lock(key) {
if (!lockPromiseForKey[key]) {
lockPromiseForKey[key] = Promise.resolve();
}
const takeLockPromise = lockPromiseForKey[key];
lockPromiseForKey[key] = takeLockPromise.then(()=>new Promise((fulfill)=>{
unlockFunctionForKey[key] = fulfill;
}));
return takeLockPromise;
}
function unlock(key) {
if (unlockFunctionForKey[key]) {
unlockFunctionForKey[key]();
delete unlockFunctionForKey[key];
}
}
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