二重課金を防ぐ

curl https://www.aisplice.store/v1/videos \
  -H "Authorization: Bearer sk-YOUR_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: $(uuidgen)" \
  -d '{
    "model": "doubao-seedance-2.5",
    "prompt": "A drone shot of a lighthouse at dawn"
  }'

import time, uuid, requests

def submit_once(job_id: str, body: dict, api_key: str, tries: int = 5):
    # Same key for every attempt of this job — that is what makes it safe.
    key = str(uuid.uuid5(uuid.NAMESPACE_URL, f"video-job:{job_id}"))

    for attempt in range(tries):
        response = requests.post(
            f"https://www.aisplice.store/v1/videos",
            headers={
                "Authorization": f"Bearer {api_key}",
                "Idempotency-Key": key,
            },
            json=body,
            timeout=60,
        )

        if response.status_code == 409:
            code = response.json().get("code", "")
            if code == "IDEMPOTENCY_IN_PROGRESS":
                time.sleep(int(response.headers.get("Retry-After", 2)))
                continue
            # PAYLOAD_CONFLICT or RESULT_UNREPLAYABLE: a human decision,
            # never a silent resubmit.
            raise RuntimeError(response.text)

        if response.status_code >= 500:
            time.sleep(2 ** attempt)
            continue

        response.raise_for_status()
        replayed = response.headers.get("X-Idempotent-Replayed") == "true"
        return response.json(), replayed

    raise TimeoutError(f"submit for {job_id} did not settle")