@dancing-ninjas/project-euler-helper-kit/scripts/npmjs-proxy-logs-to-events.mjs

Dancing Ninjas Project Euler helpers + constrained telemetry strategies compatible with npmjs.org-only egress.

import fs from 'fs';
import readline from 'readline';

const input = process.argv[2];
const out = process.argv[3] || 'telemetry/events.ndjson';
const pkg = process.argv[4];

if (!input || !pkg) {
  console.error('Usage: node scripts/npmjs-proxy-logs-to-events.mjs <infile> <outfile> <package>');
  process.exit(1);
}

const rl = readline.createInterface({ input: fs.createReadStream(input, { encoding: 'utf8' }) });
const outStream = fs.createWriteStream(out, { flags: 'a' });

function parse(line) {
  const req = line.match(/"GET ([^ ]+) HTTP/);
  if (!req) return null;
  const path = req[1];
  if (!path.includes(pkg.split('/').pop()) || !path.endsWith('.tgz')) return null;
  const t = line.match(/\[(.*?)\]/);
  return { at: new Date().toISOString(), path };
}

rl.on('line', line => {
  const ev = parse(line);
  if (ev) outStream.write(JSON.stringify({ kind: 'download', at: ev.at, pkg, http: { path: ev.path } }) + '\n');
});