crowdfree/backend/cache.js

A crowdin compatible tool for translation and localisation of websites and applications

const fs = require("fs")
const path = require("path")

// Prepare cache directories
console.time("Loaded cache")
if (!fs.existsSync(path.join(__dirname, "./cache"))) {
    console.log("Creating folder "+path.join(__dirname, "./cache"))
    fs.mkdirSync(path.join(__dirname, "./cache"))
}
if (fs.existsSync(path.join(__dirname, "./cache/functionCache.json"))) {
    try {
        console.log(`Reading file ${path.join(__dirname, "./cache/functionCache.json")}`)
        var functionCache = JSON.parse(fs.readFileSync(path.join(__dirname, "./cache/functionCache.json")))
    } catch (e) {
        var functionCache = []
    }
} else {
    var functionCache = []
}
console.timeEnd("Loaded cache")

async function cache(func, ...args) {
    // Check if the function has been called with these arguments before
    let cachedResponse = functionCache.find(x => JSON.stringify(x.args) === JSON.stringify(args))
    if (cachedResponse?.result) {
        cachedResponse.uses += 1
        // console.log("Using cached response ", cachedResponse.uses)
        return cachedResponse.result
    } else {
        // console.log("No cached response found", ...args)
        let result = await func(...args)
        if (result) functionCache.push({
            args,
            result,
            uses: 0,
        })
        return result
    }
}

let isExiting = false
async function exithandler() {
    if(isExiting) return
    isExiting = true
    console.log("Caught exit signal, saving cache and shutting down")
    // Save cache
    console.time("Saved cache")
    let data = JSON.stringify(functionCache, null, 2)
    fs.writeFile(path.join(__dirname, "./cache/functionCache.json"), data, (error) => {
        console.timeEnd("Saved cache")
        process.exit()
    })
}
process.on("exit", exithandler)
process.on("SIGINT", exithandler)
// process.on("uncaughtException", exithandler)

module.exports = cache