冪等性

POST /api/v1/jobs/createTask
Idempotency-Key: order-8814-render-1

{ "code": 409, "msg": "Idempotency key conflict, please retry shortly" }

// These are business codes from the response body, not HTTP statuses.
const RETRYABLE = new Set([429, 500, 50301]);
const sleep = (ms) => new Promise((r) => setTimeout(r, ms));
const backoff = (attempt) => sleep(2 ** attempt * 500 + Math.random() * 300);

async function createTaskWithRetry(payload, idempotencyKey, { attempts = 4 } = {}) {
  let conflicts = 0;

  for (let i = 0; i < attempts; i++) {
    // Declared outside try so the checks below can read them.
    let res;
    let body;
    try {
      res = await fetch('https://api.spicyapi.ai/api/v1/jobs/createTask', {
        method: 'POST',
        headers: {
          Authorization: `Bearer ${process.env.SPICY_API_KEY}`,
          'Content-Type': 'application/json',
          'Idempotency-Key': idempotencyKey,
        },
        body: JSON.stringify(payload),
      });
      body = await res.json();
    } catch {
      // Transport failure or unreadable body: the request may well have landed.
      // Retrying with the same key is safe.
      await backoff(i);
      continue;
    }

    if (res.status === 202 && body.code === 200) return body.data;

    // Only one of the three 409s is a transient race, so cap 409 retries at one.
    const retry = body.code === 409 ? ++conflicts <= 1 : RETRYABLE.has(body.code);
    if (!retry) {
      throw new Error(`${body.code} ${body.msg} (request_id=${body.request_id})`);
    }
    await backoff(i);
  }
  // Still unknown whether the task exists. Try again later with the SAME key.
  throw new Error(`out of retries for Idempotency-Key ${idempotencyKey}`);
}

// payload is { model, input } built from the live catalog; order is your own record.
// The key is derived from the order, so it is identical after a restart.
const task = await createTaskWithRetry(payload, `order-${order.id}-render-1`);
console.log(task.taskId);

import os, random, time, requests

# These are business codes from the response body, not HTTP statuses.
RETRYABLE = {429, 500, 50301}


def create_task_with_retry(payload: dict, idempotency_key: str, attempts: int = 4) -> dict:
    conflicts = 0

    for i in range(attempts):
        try:
            res = requests.post(
                "https://api.spicyapi.ai/api/v1/jobs/createTask",
                headers={
                    "Authorization": f"Bearer {os.environ['SPICY_API_KEY']}",
                    "Content-Type": "application/json",
                    "Idempotency-Key": idempotency_key,
                },
                json=payload,
                timeout=30,
            )
            body = res.json()
        except (requests.RequestException, ValueError):
            # Transport failure or unreadable body: the request may well have landed.
            # Retrying with the same key is safe.
            time.sleep(2**i * 0.5 + random.random() * 0.3)
            continue

        if res.status_code == 202 and body["code"] == 200:
            return body["data"]

        # Only one of the three 409s is a transient race, so cap 409 retries at one.
        if body["code"] == 409:
            conflicts += 1
            retry = conflicts <= 1
        else:
            retry = body["code"] in RETRYABLE
        if not retry:
            raise RuntimeError(f'{body["code"]} {body["msg"]} (request_id={body.get("request_id")})')
        time.sleep(2**i * 0.5 + random.random() * 0.3)

    # Still unknown whether the task exists. Try again later with the SAME key.
    raise RuntimeError(f"out of retries for Idempotency-Key {idempotency_key}")


# payload is {"model": ..., "input": ...} built from the live catalog; order_id is yours.
# The key is derived from the order, so it is identical after a restart.
task = create_task_with_retry(payload, f"order-{order_id}-render-1")
print(task["taskId"])