/** bitbank Public API ベースURL */
export const BITBANK_API_BASE = 'https://public.bitbank.cc';
export interface FetchJsonOptions {
timeoutMs?: number;
retries?: number;
}
export async function fetchJson<T = unknown>(url: string, { timeoutMs = 2500, retries = 2 }: FetchJsonOptions = {}): Promise<T> {
let lastErr: unknown;
for (let i = 0; i <= retries; i++) {
const ctrl = new AbortController();
const t = setTimeout(() => ctrl.abort(), timeoutMs);
try {
const res = await fetch(url, { signal: ctrl.signal });
clearTimeout(t);
if (!res.ok) throw new Error(`HTTP ${res.status} ${res.statusText}`);
return (await res.json()) as T;
} catch (e) {
clearTimeout(t);
lastErr = e;
if (i < retries) await new Promise((r) => setTimeout(r, 200 * 2 ** i));
}
}
throw lastErr;
}
