add presist

src/utils/persistence.ts

@@ -0,0 +1,37 @@
+import fs from "fs/promises";
+import path from "path";
+
+const DATA_DIR = path.resolve(process.cwd(), "data");
+let dataDirReady = false;
+
+async function ensureDataDir(): Promise<void> {
+  if (dataDirReady) return;
+  await fs.mkdir(DATA_DIR, { recursive: true }).catch(() => undefined);
+  dataDirReady = true;
+}
+
+export async function loadState<T>(fileName: string): Promise<T | null> {
+  try {
+    await ensureDataDir();
+    const filePath = path.join(DATA_DIR, fileName);
+    const data = await fs.readFile(filePath, "utf8");
+    return JSON.parse(data) as T;
+  } catch (error: any) {
+    if (error?.code === "ENOENT") return null;
+    console.error(`[state] load ${fileName} failed`, error);
+    return null;
+  }
+}
+
+export async function saveState(fileName: string, state: unknown): Promise<void> {
+  try {
+    await ensureDataDir();
+    const filePath = path.join(DATA_DIR, fileName);
+    const tempPath = `${filePath}.tmp`;
+    const payload = JSON.stringify(state, null, 2);
+    await fs.writeFile(tempPath, payload, "utf8");
+    await fs.rename(tempPath, filePath);
+  } catch (error) {
+    console.error(`[state] save ${fileName} failed`, error);
+  }
+}

src/utils/strategy.ts

@@ -1,4 +1,4 @@
-import { AsterAccountSnapshot, AsterKline } from "../exchanges/types";
+import type { AsterAccountSnapshot, AsterKline } from "../exchanges/types";
 
 export interface PositionSnapshot {
   positionAmt: number;