Store and visualize use-case, model, token usage (#1118)

Author: maekawataiki

package-lock.json

@@ -0,0 +1,50 @@
+import { aggregateTokenUsage } from './repository';
+import { GetTokenUsageEvent } from 'generative-ai-use-cases';
+
+export const handler = async (event: GetTokenUsageEvent) => {
+  try {
+    console.log('Getting token usage statistics', { event });
+
+    // Get user ID from Cognito
+    const userId = event.requestContext.authorizer!.claims['cognito:username'];
+    const { startDate, endDate } = event.queryStringParameters || {};
+
+    if (!startDate || !endDate) {
+      return {
+        statusCode: 400,
+        headers: {
+          'Content-Type': 'application/json',
+          'Access-Control-Allow-Origin': '*',
+        },
+        body: JSON.stringify({
+          message: 'startDate and endDate parameters are required',
+        }),
+      };
+    }
+
+    // Get aggregated data for the specified period
+    const stats = await aggregateTokenUsage(startDate, endDate, [userId]);
+
+    return {
+      statusCode: 200,
+      headers: {
+        'Content-Type': 'application/json',
+        'Access-Control-Allow-Origin': '*',
+      },
+      body: JSON.stringify(stats),
+    };
+  } catch (error) {
+    console.error('Error getting token usage statistics:', error);
+    return {
+      statusCode: 500,
+      headers: {
+        'Content-Type': 'application/json',
+        'Access-Control-Allow-Origin': '*',
+      },
+      body: JSON.stringify({
+        message: 'Internal server error',
+        error: error instanceof Error ? error.message : 'Unknown error',
+      }),
+    };
+  }
+};