refactor: extract shared adapter utilities (safeInvoke + initManager)

Created src/exchanges/adapter-utils.ts with createSafeInvoke() and
createInitManager() factories. Converted 7/8 adapters to use shared
utilities, eliminating ~350 lines of duplicated retry/init/error-handling
boilerplate. Lighter adapter kept as-is (no retry logic by design).
Also translated Chinese comments in adapter.ts and order-schema.ts.

src/exchanges/backpack/adapter.ts

@@ -9,6 +9,7 @@ import type {
 import type { Order, CreateOrderParams } from "../types";
 import { extractMessage } from "../../utils/errors";
 import { BackpackGateway, type BackpackGatewayOptions } from "./gateway";
+import { createSafeInvoke, createInitManager } from "../adapter-utils";
 
 export interface BackpackCredentials {
   apiKey?: string;
@@ -23,11 +24,8 @@ export class BackpackExchangeAdapter implements ExchangeAdapter {
   readonly id = "backpack";
   private readonly gateway: BackpackGateway;
   private readonly symbol: string;
-  private initPromise: Promise<void> | null = null;
-  private readonly initContexts = new Set<string>();
-  private retryTimer: ReturnType<typeof setTimeout> | null = null;
-  private retryDelayMs = 3000;
-  private lastInitErrorAt = 0;
+  private readonly safeInvoke = createSafeInvoke("BackpackExchangeAdapter");
+  private readonly init: ReturnType<typeof createInitManager>;
 
   constructor(credentials: BackpackCredentials = {}) {
     const apiKey = credentials.apiKey ?? process.env.BACKPACK_API_KEY;
@@ -54,6 +52,9 @@ export class BackpackExchangeAdapter implements ExchangeAdapter {
     
     this.gateway = new BackpackGateway(gatewayOptions);
     this.symbol = symbol;
+    this.init = createInitManager("BackpackExchangeAdapter", () =>
+      this.gateway.ensureInitialized(this.symbol),
+    );
   }
 
   supportsTrailingStops(): boolean {
@@ -61,118 +62,50 @@ export class BackpackExchangeAdapter implements ExchangeAdapter {
   }
 
   watchAccount(cb: AccountListener): void {
-    void this.ensureInitialized("watchAccount");
+    void this.init.ensureInitialized("watchAccount");
     this.gateway.onAccount(this.safeInvoke("watchAccount", cb));
   }
 
   watchOrders(cb: OrderListener): void {
-    void this.ensureInitialized("watchOrders");
+    void this.init.ensureInitialized("watchOrders");
     this.gateway.onOrders(this.safeInvoke("watchOrders", cb));
   }
 
   watchDepth(_symbol: string, cb: DepthListener): void {
-    void this.ensureInitialized("watchDepth");
+    void this.init.ensureInitialized("watchDepth");
     this.gateway.onDepth(this.safeInvoke("watchDepth", cb));
   }
 
   watchTicker(_symbol: string, cb: TickerListener): void {
-    void this.ensureInitialized("watchTicker");
+    void this.init.ensureInitialized("watchTicker");
     this.gateway.onTicker(this.safeInvoke("watchTicker", cb));
   }
 
   watchKlines(_symbol: string, interval: string, cb: KlineListener): void {
-    void this.ensureInitialized(`watchKlines:${interval}`);
+    void this.init.ensureInitialized(`watchKlines:${interval}`);
     this.gateway.watchKlines(interval, this.safeInvoke("watchKlines", cb));
   }
 
   async createOrder(params: CreateOrderParams): Promise<Order> {
-    await this.ensureInitialized("createOrder");
+    await this.init.ensureInitialized("createOrder");
     return this.gateway.createOrder(params);
   }
 
   async cancelOrder(params: { symbol: string; orderId: number | string }): Promise<void> {
-    await this.ensureInitialized("cancelOrder");
+    await this.init.ensureInitialized("cancelOrder");
     await this.gateway.cancelOrder({ orderId: params.orderId });
   }
 
   async cancelOrders(params: { symbol: string; orderIdList: Array<number | string> }): Promise<void> {
-    await this.ensureInitialized("cancelOrders");
+    await this.init.ensureInitialized("cancelOrders");
     await this.gateway.cancelOrders({ orderIdList: params.orderIdList });
   }
 
   async cancelAllOrders(_params: { symbol: string }): Promise<void> {
-    await this.ensureInitialized("cancelAllOrders");
+    await this.init.ensureInitialized("cancelAllOrders");
     await this.gateway.cancelAllOrders();
   }
 
-  private safeInvoke<T extends (...args: any[]) => void>(context: string, cb: T): T {
-    const wrapped = ((...args: any[]) => {
-      try {
-        cb(...args);
-      } catch (error) {
-        console.error(`[BackpackExchangeAdapter] ${context} handler failed: ${extractMessage(error)}`);
-      }
-    }) as T;
-    return wrapped;
-  }
-
-  private ensureInitialized(context?: string): Promise<void> {
-    if (!this.initPromise) {
-      this.initContexts.clear();
-      this.initPromise = this.gateway
-        .ensureInitialized(this.symbol)
-        .then((value) => {
-      if (process.env.BACKPACK_DEBUG === "1") {
-        console.error(`[BackpackExchangeAdapter] initialize succeeded`);
-      }
-      if (process.env.BACKPACK_DEBUG === "1") {
-        console.error(`[BackpackExchangeAdapter] initialize succeeded`);
-      }
-      this.clearRetry();
-          return value;
-        })
-        .catch((error) => {
-          this.handleInitError("initialize", error);
-          this.initPromise = null;
-          this.scheduleRetry();
-          throw error;
-        });
-    }
-    if (context && !this.initContexts.has(context)) {
-      this.initContexts.add(context);
-      this.initPromise.catch((error) => {
-        this.handleInitError(context, error);
-        this.scheduleRetry();
-      });
-    }
-    return this.initPromise;
-  }
-
-  private scheduleRetry(): void {
-    if (this.retryTimer) return;
-    this.retryTimer = setTimeout(() => {
-      this.retryTimer = null;
-      if (this.initPromise) return;
-      this.retryDelayMs = Math.min(this.retryDelayMs * 2, 60_000);
-      void this.ensureInitialized("retry");
-    }, this.retryDelayMs);
-  }
-
-  private clearRetry(): void {
-    if (this.retryTimer) {
-      clearTimeout(this.retryTimer);
-      this.retryTimer = null;
-    }
-    this.retryDelayMs = 3000;
-  }
-
-  private handleInitError(context: string, error: unknown): void {
-    const now = Date.now();
-    if (now - this.lastInitErrorAt < 5000) return;
-    this.lastInitErrorAt = now;
-    console.error(`[BackpackExchangeAdapter] ${context} failed`, error);
-  }
-
   private logError(context: string, error: unknown): void {
     if (process.env.BACKPACK_DEBUG === "1" || process.env.BACKPACK_DEBUG === "true") {
       console.error(`[BackpackExchangeAdapter] ${context} failed: ${extractMessage(error)}`);