Commit Inicial

2026-03-25 09:47:08 -03:00
commit 9636921d99
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+/**
+ * SSE Polling Example Client (SEP-1699)
+ *
+ * This example demonstrates client-side behavior during server-initiated
+ * SSE stream disconnection and automatic reconnection.
+ *
+ * Key features demonstrated:
+ * - Automatic reconnection when server closes SSE stream
+ * - Event replay via Last-Event-ID header
+ * - Resumption token tracking via onresumptiontoken callback
+ *
+ * Run with: npx tsx src/examples/client/ssePollingClient.ts
+ * Requires: ssePollingExample.ts server running on port 3001
+ */
+import { Client } from '../../client/index.js';
+import { StreamableHTTPClientTransport } from '../../client/streamableHttp.js';
+import { CallToolResultSchema, LoggingMessageNotificationSchema } from '../../types.js';
+const SERVER_URL = 'http://localhost:3001/mcp';
+async function main() {
+    console.log('SSE Polling Example Client');
+    console.log('==========================');
+    console.log(`Connecting to ${SERVER_URL}...`);
+    console.log('');
+    // Create transport with reconnection options
+    const transport = new StreamableHTTPClientTransport(new URL(SERVER_URL), {
+    // Use default reconnection options - SDK handles automatic reconnection
+    });
+    // Track the last event ID for debugging
+    let lastEventId;
+    // Set up transport error handler to observe disconnections
+    // Filter out expected errors from SSE reconnection
+    transport.onerror = error => {
+        // Skip abort errors during intentional close
+        if (error.message.includes('AbortError'))
+            return;
+        // Show SSE disconnect (expected when server closes stream)
+        if (error.message.includes('Unexpected end of JSON')) {
+            console.log('[Transport] SSE stream disconnected - client will auto-reconnect');
+            return;
+        }
+        console.log(`[Transport] Error: ${error.message}`);
+    };
+    // Set up transport close handler
+    transport.onclose = () => {
+        console.log('[Transport] Connection closed');
+    };
+    // Create and connect client
+    const client = new Client({
+        name: 'sse-polling-client',
+        version: '1.0.0'
+    });
+    // Set up notification handler to receive progress updates
+    client.setNotificationHandler(LoggingMessageNotificationSchema, notification => {
+        const data = notification.params.data;
+        console.log(`[Notification] ${data}`);
+    });
+    try {
+        await client.connect(transport);
+        console.log('[Client] Connected successfully');
+        console.log('');
+        // Call the long-task tool
+        console.log('[Client] Calling long-task tool...');
+        console.log('[Client] Server will disconnect mid-task to demonstrate polling');
+        console.log('');
+        const result = await client.request({
+            method: 'tools/call',
+            params: {
+                name: 'long-task',
+                arguments: {}
+            }
+        }, CallToolResultSchema, {
+            // Track resumption tokens for debugging
+            onresumptiontoken: token => {
+                lastEventId = token;
+                console.log(`[Event ID] ${token}`);
+            }
+        });
+        console.log('');
+        console.log('[Client] Tool completed!');
+        console.log(`[Result] ${JSON.stringify(result.content, null, 2)}`);
+        console.log('');
+        console.log(`[Debug] Final event ID: ${lastEventId}`);
+    }
+    catch (error) {
+        console.error('[Error]', error);
+    }
+    finally {
+        await transport.close();
+        console.log('[Client] Disconnected');
+    }
+}
+main().catch(console.error);
+//# sourceMappingURL=ssePollingClient.js.map