benchmarks

src/api/BenchmarkProvider.js

@@ -0,0 +1,45 @@
+import { YahooClient } from './YahooClient.js';
+
+export class BenchmarkProvider {
+  constructor() {
+    this.client = new YahooClient();
+    this.cache = { data: null, expiresAt: 0 };
+    this.TTL_MS = 60 * 60 * 1000; // Cache for 1 hour
+  }
+
+  async getMarketContext() {
+    // 1. Return cached data if still valid
+    if (this.cache.data && Date.now() < this.cache.expiresAt) {
+      return this.cache.data;
+    }
+
+    try {
+      const [sp500, tn10y] = await Promise.all([
+        this.client.fetchSummary('^GSPC'),
+        this.client.fetchSummary('^TNX'),
+      ]);
+
+      const context = {
+        sp500Price: sp500.price?.regularMarketPrice ?? 0,
+        riskFreeRate: tn10y.price?.regularMarketPrice ?? 0,
+        timestamp: new Date().toISOString(),
+      };
+
+      // 2. Validate data sanity (prevent 0-value errors)
+      if (context.sp500Price === 0 || context.riskFreeRate === 0) {
+        throw new Error('Invalid market data received (zero values)');
+      }
+
+      // 3. Update cache
+      this.cache = { data: context, expiresAt: Date.now() + this.TTL_MS };
+      return context;
+    } catch (error) {
+      console.error(
+        'Market data fetch failed, using last known or empty state:',
+        error,
+      );
+      // If we have stale cache, use it even if expired, otherwise return safe defaults
+      return this.cache.data || { sp500Price: 4500, riskFreeRate: 4.0 };
+    }
+  }
+}

src/api/yahooClient.js

@@ -1,10 +1,11 @@
-// src/api/YahooClient.js
 import YahooFinance from 'yahoo-finance2';
 
 export class YahooClient {
   constructor() {
     // Instantiate the client as required by v3
-    this.yf = new YahooFinance();
+    this.yf = new YahooFinance({
+      suppressNotices: ['yahooSurvey'],
+    });
   }
 
   async fetchSummary(ticker, retries = 3, backoff = 1000) {