feat: 通知を送信できるように (#163)

package.json

@@ -22,13 +22,16 @@
   },
   "dependencies": {
     "@fastify/cors": "^8.3.0",
+    "@fastify/websocket": "^8.2.0",
     "@prisma/client": "5.0.0",
     "@types/node": "^20.4.1",
+    "@types/ws": "^8.5.5",
     "date-fns": "^2.30.0",
     "esbuild": "^0.18.17",
     "fastify": "^4.20.0",
     "pino": "^8.14.2",
-    "typescript": "^5.1.6"
+    "typescript": "^5.1.6",
+    "ws": "^8.13.0"
   },
   "devDependencies": {
     "@typescript-eslint/eslint-plugin": "^6.1.0",

src/server/start.ts

@@ -99,6 +99,7 @@ export async function StartServer(port: number) {
     logger.info(q.body, "inbox");
     r.code(503).send();
   });
+
   try {
     await app.listen({ port: port, host: "0.0.0.0" });
     return;

src/server/ws/websocket_handlers.ts

@@ -0,0 +1,54 @@
+import * as http from "http";
+import WebSocket, { WebSocketServer } from "ws";
+import { IncomingMessage } from "http";
+import { Snowflake } from "../../helpers/id_generator.js";
+import logger from "../../helpers/logger.js";
+
+export interface NotificationSendReceiver {
+  Send(payload: string, to: string): Promise<void>;
+}
+
+export class DummyNotificationSendReceiver implements NotificationSendReceiver {
+  async Send(): Promise<void> {
+    return;
+  }
+}
+
+export class WebSocketNotificationSendReceiver
+  implements NotificationSendReceiver
+{
+  private ws: WebSocket.Server<
+    typeof WebSocket.WebSocket,
+    typeof IncomingMessage
+  >;
+  private connections: Map<Snowflake, WebSocket.WebSocket>;
+
+  constructor(server: http.Server) {
+    this.ws = new WebSocketServer({ noServer: true });
+    server.on("upgrade", (q, so, head) => {
+      // fixme: q.headers.authorizationを使って認証とユーザーの検証をする
+      this.ws.handleUpgrade(q, so, head, (w) => {
+        this.ws.emit("connection", w, q);
+        this.connections.set("123" as Snowflake, w);
+      });
+    });
+
+    this.connections = new Map<Snowflake, WebSocket.WebSocket>();
+
+    this.ws.on("connection", (w) => {
+      logger.info("connect");
+      w.on("message", () => {
+        console.log("received!");
+      });
+    });
+  }
+
+  async Send(payload: string, to: string): Promise<void> {
+    const cli = this.connections.get(to as Snowflake);
+    if (!cli) {
+      return;
+    }
+    cli.send(payload);
+    return;
+  }
+}

src/service/notification/@types.ts

@@ -0,0 +1,35 @@
+export interface CommonNotificationObject<T, U> {
+  type: T;
+  payload: U;
+}
+
+export type FollowedNotification = CommonNotificationObject<
+  "Followed",
+  FollowedNotificationPayload
+>;
+
+export interface FollowedNotificationPayload {
+  id: string;
+  nickName: string;
+  iconImageURL: string;
+}
+
+export type FollowSuccessNotification = CommonNotificationObject<
+  "FollowSuccess",
+  FollowSuccessNotificationPayload
+>;
+export interface FollowSuccessNotificationPayload {
+  id: string;
+  nickName: string;
+  iconImageURL: string;
+}
+
+export type ReactionNotification = CommonNotificationObject<
+  "Reaction",
+  ReactionNotificationPayload
+>;
+export interface ReactionNotificationPayload {
+  id: string;
+  nickName: string;
+  iconImageURL: string;
+}

src/service/notification/sender.ts

@@ -0,0 +1,58 @@
+import { NotificationSendReceiver } from "../../server/ws/websocket_handlers.js";
+import { UserData } from "../data/user.js";
+import { Snowflake } from "../../helpers/id_generator.js";
+import {
+  FollowedNotification,
+  FollowSuccessNotification,
+  ReactionNotification,
+} from "./@types.js";
+
+export class NotificationSenderService {
+  private sender: NotificationSendReceiver;
+  constructor(sender: NotificationSendReceiver) {
+    this.sender = sender;
+  }
+
+  // フォローされた通知
+  async Followed(u: UserData, to: Snowflake) {
+    const payload: FollowedNotification = {
+      type: "Followed",
+      payload: {
+        id: u.id,
+        nickName: u.nickName,
+        iconImageURL: u.iconImageURL,
+      },
+    };
+    const serialized = JSON.stringify(payload);
+    await this.sender.Send(serialized, to);
+    return;
+  }
+  // フォローが成功した通知
+  async FollowSuccess(u: UserData, to: Snowflake) {
+    const payload: FollowSuccessNotification = {
+      type: "FollowSuccess",
+      payload: {
+        id: u.id,
+        nickName: u.nickName,
+        iconImageURL: u.iconImageURL,
+      },
+    };
+    const serialized = JSON.stringify(payload);
+    await this.sender.Send(serialized, to);
+    return;
+  }
+  // リアクションされた通知
+  async Reaction(u: UserData, to: Snowflake) {
+    const payload: ReactionNotification = {
+      type: "Reaction",
+      payload: {
+        id: u.id,
+        nickName: u.nickName,
+        iconImageURL: u.iconImageURL,
+      },
+    };
+    const serialized = JSON.stringify(payload);
+    await this.sender.Send(serialized, to);
+    return;
+  }
+}