Esempi Node.js: ricerca con fetch, un piccolo pool e risposte con citazioni

const API = 'https://llmwebsearch.com/api/v1/search';

export async function search(body) {
  const res = await fetch(API, {
    method: 'POST',
    headers: {
      Authorization: `Bearer ${process.env.LLMWEBSEARCH_API_KEY}`,
      'Content-Type': 'application/json',
    },
    body: JSON.stringify(body),
  });
  const data = await res.json();
  if (!res.ok) {
    const err = new Error(`${res.status} ${data.error?.code}: ${data.error?.message}`);
    err.status = res.status;
    throw err;
  }
  return data;
}

const data = await search({ q: 'how to size a postgres connection pool', read: 3 });
for (const r of data.results) {
  console.log(r.position, r.content_status, r.url, r.word_count ?? '');
}

const API = 'https://llmwebsearch.com/api/v1/search';
const questions = [
  'what is connection pooling in postgres',
  'recommended pool size per cpu core',
  'pgbouncer transaction mode limitations',
  'connection pool exhaustion symptoms',
  'pool size for serverless functions',
];

async function search(q) {
  const res = await fetch(API, {
    method: 'POST',
    headers: { Authorization: `Bearer ${process.env.LLMWEBSEARCH_API_KEY}`, 'Content-Type': 'application/json' },
    body: JSON.stringify({ q, read: 2, max_chars: 4000 }),
  });
  const data = await res.json();
  if (!res.ok) return { q, error: data.error?.code ?? String(res.status) };
  return { q, urls: data.results.filter((r) => r.content_status === 'ok').map((r) => r.url) };
}

async function runPool(items, size, task) {
  const out = [];
  let next = 0;
  const worker = async () => {
    while (next < items.length) {
      const i = next++;
      out[i] = await task(items[i]);
    }
  };
  await Promise.all(Array.from({ length: size }, worker));
  return out;
}

for (const row of await runPool(questions, 4, search)) console.log(row);

const SEARCH = 'https://llmwebsearch.com/api/v1/search';
const BUDGET = 24000; // characters, about 6,000 tokens

async function sources(question) {
  const res = await fetch(SEARCH, {
    method: 'POST',
    headers: { Authorization: `Bearer ${process.env.LLMWEBSEARCH_API_KEY}`, 'Content-Type': 'application/json' },
    body: JSON.stringify({ q: question, max_results: 5, read: 3 }),
  });
  const { results } = await res.json();
  const share = Math.floor(BUDGET / Math.max(results.length, 1));
  return results
    .map((r, i) => {
      const body = r.content_status === 'ok' ? r.content.slice(0, share) : `(snippet only) ${r.snippet}`;
      return `[${i + 1}] ${r.title} - ${r.url}\n${body}`;
    })
    .join('\n\n');
}

async function answer(question) {
  const prompt = 'Answer using only the sources below. Cite them as [1], [2] and so on. '
    + 'Say so if they do not answer the question.\n\n' + (await sources(question)) + '\n\nQuestion: ' + question;
  const res = await fetch(`${process.env.LLM_BASE_URL.replace(/\/$/, '')}/chat/completions`, {
    method: 'POST',
    headers: { Authorization: `Bearer ${process.env.LLM_API_KEY}`, 'Content-Type': 'application/json' },
    body: JSON.stringify({ model: process.env.LLM_MODEL, messages: [{ role: 'user', content: prompt }] }),
  });
  const data = await res.json();
  return data.choices[0].message.content;
}

console.log(await answer('How should I size a Postgres connection pool?'));