Merge pull request #47 from brendan-ch/chore/improve-apns-performance

[INT-75] chore/improve-apns-performance

src/notifications/senders/AppleNotificationSender.ts

@@ -1,5 +1,6 @@
 import jwt from "jsonwebtoken";
 import http2 from "http2";
+import { ClientHttp2Session } from "node:http2";
 
 interface APNsUrl {
   fullUrl: string;
@@ -17,10 +18,20 @@ export class AppleNotificationSender {
   private apnsToken: string | undefined = undefined;
   private _lastRefreshedTimeMs: number | undefined = undefined;
 
-  constructor(private shouldActuallySendNotifications = true) {
+  constructor(
+    private shouldActuallySendNotifications = true,
+    private client: ClientHttp2Session | undefined = undefined,
+  ) {
     this.sendNotificationImmediately = this.sendNotificationImmediately.bind(this);
     this.lastReloadedTimeForAPNsIsTooRecent = this.lastReloadedTimeForAPNsIsTooRecent.bind(this);
     this.reloadAPNsTokenIfTimePassed = this.reloadAPNsTokenIfTimePassed.bind(this);
+    this.openConnectionIfNoneExists = this.openConnectionIfNoneExists.bind(this);
+    this.closeConnectionIfExists = this.closeConnectionIfExists.bind(this);
+    this.registerClosureEventsForClient = this.registerClosureEventsForClient.bind(this);
+
+    if (this.client !== undefined) {
+      this.registerClosureEventsForClient();
+    }
   }
 
   get lastRefreshedTimeMs(): number | undefined {
@@ -83,7 +94,9 @@ export class AppleNotificationSender {
       throw new Error("APNS_BUNDLE_ID environment variable is not set correctly");
     }
 
-    const { path, host } = AppleNotificationSender.getAPNsFullUrlToUse(deviceId);
+    this.openConnectionIfNoneExists();
+
+    const { path } = AppleNotificationSender.getAPNsFullUrlToUse(deviceId);
 
     const headers = {
       ':method': 'POST',
@@ -95,8 +108,8 @@ export class AppleNotificationSender {
       "apns-topic": bundleId,
     };
     try {
-      const client = http2.connect(host);
-      const req = client.request(headers);
+      if (!this.client) { return false }
+      const req = this.client.request(headers);
       req.setEncoding('utf8');
 
       await new Promise<void>((resolve, reject) => {
@@ -131,15 +144,29 @@ export class AppleNotificationSender {
     }
   }
 
-  public static getAPNsFullUrlToUse(deviceId: string): APNsUrl {
-    // Construct the fetch request
-    const devBaseUrl = "https://api.development.push.apple.com"
-    const prodBaseUrl = "https://api.push.apple.com"
+  private openConnectionIfNoneExists() {
+    const host = AppleNotificationSender.getAPNsHostToUse();
 
-    let hostToUse = devBaseUrl;
-    if (process.env.APNS_IS_PRODUCTION === "1") {
-      hostToUse = prodBaseUrl;
+    if (!this.client) {
+      this.client = http2.connect(host);
+      this.registerClosureEventsForClient();
     }
+  }
+
+  private registerClosureEventsForClient() {
+    this.client?.on('close', this.closeConnectionIfExists);
+    this.client?.on('error', this.closeConnectionIfExists);
+    this.client?.on('goaway', this.closeConnectionIfExists);
+    this.client?.on('timeout', this.closeConnectionIfExists);
+  }
+
+  private closeConnectionIfExists() {
+    this.client?.close();
+    this.client = undefined;
+  }
+
+  public static getAPNsFullUrlToUse(deviceId: string): APNsUrl {
+    let hostToUse = this.getAPNsHostToUse();
 
     const path = "/3/device/" + deviceId;
     const fullUrl = hostToUse + path;
@@ -151,4 +178,15 @@ export class AppleNotificationSender {
     };
   }
 
+  public static getAPNsHostToUse() {
+    // Construct the fetch request
+    const devBaseUrl = "https://api.development.push.apple.com"
+    const prodBaseUrl = "https://api.push.apple.com"
+
+    let hostToUse = devBaseUrl;
+    if (process.env.APNS_IS_PRODUCTION === "1") {
+      hostToUse = prodBaseUrl;
+    }
+    return hostToUse;
+  }
 }

test/notifications/senders/AppleNotificationSenderTests.test.ts

@@ -5,29 +5,36 @@ import {
   AppleNotificationSender,
   NotificationAlertArguments
 } from "../../../src/notifications/senders/AppleNotificationSender";
+import { ClientHttp2Session } from "node:http2";
 
 jest.mock("http2");
 
 const sampleKeyBase64 = "LS0tLS1CRUdJTiBQUklWQVRFIEtFWS0tLS0tCk1JR1RBZ0VBTUJNR0J5cUdTTTQ5QWdFR0NDcUdTTTQ5QXdFSEJIa3dkd0lCQVFRZ3NybVNBWklhZ09mQ1A4c0IKV2kyQ0JYRzFPbzd2MWJpc3BJWkN3SXI0UkRlZ0NnWUlLb1pJemowREFRZWhSQU5DQUFUWkh4VjJ3UUpMTUJxKwp5YSt5ZkdpM2cyWlV2NmhyZmUrajA4eXRla1BIalhTMHF6Sm9WRUx6S0hhNkVMOVlBb1pEWEJ0QjZoK2ZHaFhlClNPY09OYmFmCi0tLS0tRU5EIFBSSVZBVEUgS0VZLS0tLS0K";
 
-function mockHttp2Connect(status: number) {
 class MockClient extends EventEmitter {
+  constructor(
+    private status: number,
+  ) {
+    super()
+  }
+
   request = jest.fn((_) => {
     const mockRequest: any = new EventEmitter();
     mockRequest.setEncoding = jest.fn();
     mockRequest.write = jest.fn();
     mockRequest.end = jest.fn(() => {
       setTimeout(() => {
-          mockRequest.emit('response', { ':status': status });
+        mockRequest.emit('response', { ':status': this.status });
       }, 10);
     });
     return mockRequest;
   });
 
-    close() {};
+  close = jest.fn(() => {});
 }
 
-  (http2.connect as jest.Mock) = jest.fn(() => new MockClient());
+function mockHttp2Connect(status: number) {
+  (http2.connect as jest.Mock) = jest.fn(() => new MockClient(status));
 }
 
 describe("AppleNotificationSender", () => {
@@ -91,7 +98,7 @@ describe("AppleNotificationSender", () => {
   });
 
   describe("sendNotificationImmediately", () => {
-    it('makes the connection to the http server if the notification should be sent', async () => {
+    it('makes the connection to the http server if sending a notification for the first time', async () => {
       const notificationArguments: NotificationAlertArguments = {
         title: 'Test notification',
         body: 'This notification will send',
@@ -103,6 +110,20 @@ describe("AppleNotificationSender", () => {
       expect(result).toBe(true);
     });
 
+    it('reuses the existing connection if sending another notification', async () => {
+      const notificationArguments: NotificationAlertArguments = {
+        title: 'Test notification',
+        body: 'This notification will send',
+      }
+
+      const result1 = await notificationSender.sendNotificationImmediately('1', notificationArguments);
+      const result2 = await notificationSender.sendNotificationImmediately('1', notificationArguments);
+
+      expect(http2.connect).toHaveBeenCalledTimes(1);
+      expect(result1).toBe(true);
+      expect(result2).toBe(true);
+    });
+
     it('throws an error if the bundle ID is not set correctly', async () => {
       process.env = {
         ...process.env,
@@ -145,5 +166,25 @@ describe("AppleNotificationSender", () => {
       expect(http2.connect).not.toHaveBeenCalled();
       expect(result).toBe(true);
     });
+
+    it("registers a handler to close the connection if `close` event fired", async () => {
+      const connectionCloseEvents = ['close', 'goaway', 'error', 'timeout'];
+
+      await Promise.all(connectionCloseEvents.map(async (event) => {
+        const mockClient = new MockClient(200);
+        notificationSender = new AppleNotificationSender(true, mockClient as unknown as ClientHttp2Session);
+
+        const notificationArguments: NotificationAlertArguments = {
+          title: 'Test notification',
+          body: ''
+        };
+
+        await notificationSender.sendNotificationImmediately('1', notificationArguments);
+
+        mockClient.emit(event);
+
+        expect(mockClient.close).toHaveBeenCalled();
+      }));
+    });
   });
 });