모바일 로드 오류 수정

frontend/src/utils/upbitTickerFetch.ts

@@ -0,0 +1,56 @@
+/**
+ * 업비트 /ticker REST — 청크·지연·429 백오프 (공유)
+ */
+import { UPBIT_API } from './upbitApi';
+
+export interface UpbitTickerRaw {
+  market?: string;
+  code?: string;
+  trade_price: number;
+  signed_change_rate: number;
+  signed_change_price: number;
+  acc_trade_price_24h: number;
+  acc_trade_volume_24h?: number;
+  opening_price: number;
+  high_price: number;
+  low_price: number;
+  change?: 'RISE' | 'FALL' | 'EVEN';
+}
+
+const CHUNK_SIZE = 60;
+const CHUNK_DELAY_MS = 150;
+const MAX_CHUNK_ATTEMPTS = 5;
+
+function sleep(ms: number): Promise<void> {
+  return new Promise(r => setTimeout(r, ms));
+}
+
+/** 중복 제거 후 청크 단위 ticker 조회 (429 시 백오프) */
+export async function fetchTickersThrottled(markets: string[]): Promise<UpbitTickerRaw[]> {
+  const unique = [...new Set(markets.filter(m => m?.startsWith('KRW-')))];
+  if (unique.length === 0) return [];
+
+  const results: UpbitTickerRaw[] = [];
+  for (let i = 0; i < unique.length; i += CHUNK_SIZE) {
+    const chunk = unique.slice(i, i + CHUNK_SIZE);
+    let done = false;
+    for (let attempt = 0; attempt < MAX_CHUNK_ATTEMPTS && !done; attempt++) {
+      try {
+        const res = await fetch(`${UPBIT_API}/ticker?markets=${chunk.join(',')}`);
+        if (res.status === 429) {
+          await sleep(500 * (attempt + 1));
+          continue;
+        }
+        if (res.ok) {
+          const data = (await res.json()) as UpbitTickerRaw[];
+          if (Array.isArray(data)) results.push(...data);
+        }
+        done = true;
+      } catch {
+        await sleep(300 * (attempt + 1));
+      }
+    }
+    if (i + CHUNK_SIZE < unique.length) await sleep(CHUNK_DELAY_MS);
+  }
+  return results;
+}