26 lines
857 B
JavaScript
26 lines
857 B
JavaScript
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import { existsSync } from "node:fs";
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import { readFile, writeFile } from "node:fs/promises";
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import { resolve } from "node:path";
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/**
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*
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* @template T
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* @param {string} fileName
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* @param {()=>Promise<T>} asyncCallback
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* @returns {Promise<T>}
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*/
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export async function cacheFunctionOutput(fileName, asyncCallback) {
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const fileLoc = resolve('./cache', fileName);
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if (existsSync(fileLoc)) {
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console.log("[cacher] Using cached ", fileLoc);
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const fileContents = (await readFile(fileLoc)).toString();
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return JSON.parse(fileContents);
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} else {
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console.log("[cacher] cache miss")
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const returnRes = await asyncCallback();
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const fileContents = JSON.stringify(returnRes);
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await writeFile(fileLoc,fileContents);
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console.log("[cacher] saved ",fileLoc)
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return returnRes;
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}
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}
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