الأخطاء

{
  "error": {
    "code": "insufficient_credit",
    "message": "الرصيد لا يكفي لتنفيذ الطلب"
  }
}

const RETRYABLE = new Set([429, 500, 502, 503, 504])

async function callWithRetry(body, attempt = 0) {
  const response = await fetch("https://<host>/v1/chat/completions", {
    method: "POST",
    headers: {
      Authorization: `Bearer ${process.env.VORIX_API_KEY}`,
      "Content-Type": "application/json",
    },
    body: JSON.stringify(body),
  })

  if (response.ok) return response.json()

  const { error } = await response.json()

  // Retrying never fixes an empty balance: send the user to top up.
  if (response.status === 402) throw new InsufficientCredit(error.message)

  if (RETRYABLE.has(response.status) && attempt < 4) {
    // Exponential backoff with jitter, so every client does not retry at
    // the same instant and create a second wave worse than the first.
    const waitMs = 1000 * 2 ** attempt + Math.random() * 250
    await new Promise((resolve) => setTimeout(resolve, waitMs))
    return callWithRetry(body, attempt + 1)
  }

  throw new Error(`${error.code}: ${error.message}`)
}