feat: support check delay

src/services/delay.ts

@@ -0,0 +1,37 @@
+import { getProxyDelay } from "./api";
+
+const hashKey = (name: string, group: string) => `${group ?? ""}::${name}`;
+
+class DelayManager {
+  private cache = new Map<string, [number, number]>();
+
+  setDelay(name: string, group: string, delay: number) {
+    this.cache.set(hashKey(name, group), [Date.now(), delay]);
+  }
+
+  getDelay(name: string, group: string) {
+    if (!name) return -1;
+
+    const result = this.cache.get(hashKey(name, group));
+    if (result && Date.now() - result[0] <= 18e5) {
+      return result[1];
+    }
+    return -1;
+  }
+
+  async checkDelay(name: string, group: string) {
+    let delay = -1;
+
+    try {
+      const result = await getProxyDelay(name);
+      delay = result.delay;
+    } catch {
+      delay = 1e6; // error
+    }
+
+    this.setDelay(name, group, delay);
+    return delay;
+  }
+}
+
+export default new DelayManager();