Initial commit

src/transports/transport-sse.ts

@@ -0,0 +1,51 @@
+import { SSESession } from '../utils/sse-session.js';
+import { BaseTransport } from './base-transport.js';
+
+export class TransportSSE extends BaseTransport {
+  static async from(url: string) {
+    const session = await SSESession.from(url);
+    return new TransportSSE(session);
+  }
+
+  static fromSSESession(session: SSESession) {
+    return new TransportSSE(session);
+  }
+
+  constructor(private readonly session: SSESession) {
+    super();
+
+    console.log('created transport sse');
+
+    this.session.on('message', (message) => this.emit('message', message));
+    this.session.on('connected', () => this.emit('connected', true));
+    this.session.on('disconnected', () => this.emit('disconnected', true));
+  }
+
+  /**
+   * Send fetch request to the url, ignoring SSE client as it's not needed for this transport
+   * @param url - The URL to send the message to
+   * @param body - The body to send
+   */
+  async send(url: string, body: unknown): Promise<unknown> {
+    const response = await fetch(url, {
+      method: 'POST',
+      body: JSON.stringify(body),
+    });
+
+    return response.json();
+  }
+
+  /**
+   * Connect the SSE session
+   */
+  async connect(): Promise<void> {
+    await this.session.connect();
+  }
+
+  /**
+   * Disconnect the SSE session
+   */
+  async disconnect(): Promise<void> {
+    this.session.close();
+  }
+}