blaze-install/lib/prefetch.js

A new package manager

"use strict";
const { resolveDependencies } = require("./resolveDependencies");
const fs = require("fs/promises");
const path = require("path");
const os = require("os");
const axios = require("axios");
const cliProgress = require("cli-progress");
const chalk = require('chalk');
const CACHE_DIR = path.join(os.homedir(), ".blaze_cache");
const isVerbose = process.argv.includes('--verbose');
async function prefetchAll(deps) {
    console.log(chalk.cyan('✨ Prefetching all dependencies and tarballs for offline use... ✨'));
    const tree = await resolveDependencies(deps);
    let count = 0;
    const pkgs = Object.entries(tree);
    const bar = new cliProgress.SingleBar({
        format: 'Prefetching [{bar}] {value}/{total} {package}',
        clearOnComplete: true
    }, cliProgress.Presets.shades_classic);
    bar.start(pkgs.length, 0, { package: '' });
    let i = 0;
    for (const [name, info] of pkgs) {
        if (info.version &&
            (info.version.startsWith("file:") || info.version.startsWith("link:")))
            continue;
        // Fetch and cache metadata
        const metaUrl = `https://registry.npmjs.org/${encodeURIComponent(name)}`;
        const metaPath = path.join(CACHE_DIR, `metadata-${name.replace("/", "_")}.json`);
        try {
            const { data } = await axios.get(metaUrl);
            await fs.writeFile(metaPath, JSON.stringify(data), "utf-8");
        }
        catch { } // intentionally empty
        // Fetch and cache tarball
        const version = info.version;
        const meta = JSON.parse(await fs.readFile(metaPath, "utf-8"));
        const tarballUrl = meta.versions[version].dist.tarball;
        const tarballHash = require("crypto")
            .createHash("sha256")
            .update(tarballUrl)
            .digest("hex");
        const tarballPath = path.join(CACHE_DIR, tarballHash + ".tgz");
        if (!(await fs.stat(tarballPath).catch(() => false))) {
            const res = await axios.get(tarballUrl, { responseType: "arraybuffer" });
            await fs.writeFile(tarballPath, res.data);
            count++;
        }
        i++;
        bar.update(i, { package: name });
        // Only show per-package, cache, and internal logs if isVerbose
        if (isVerbose) {
            // e.g. console.log(`[blaze] Prefetched ${name}`);
        }
    }
    bar.stop();
    console.log(`Prefetch complete. ${Object.keys(tree).length} packages metadata and ${count} tarballs cached.`);
}
module.exports = { prefetchAll };