fixes

src/tools/pyth_fetch_price.ts

@@ -0,0 +1,40 @@
+import { PriceServiceConnection } from "@pythnetwork/price-service-client";
+import BN from "bn.js";
+
+/**
+ * Fetch the price of a given price feed from Pyth
+ * @param agent SolanaAgentKit instance
+ * @param priceFeedID Price feed ID
+ * @returns Latest price value from feed
+ *
+ * You can find priceFeedIDs here: https://www.pyth.network/developers/price-feed-ids#stable
+ */
+export async function pythFetchPrice(priceFeedID: string): Promise<string> {
+  // get Hermes service URL from https://docs.pyth.network/price-feeds/api-instances-and-providers/hermes
+  const stableHermesServiceUrl: string = "https://hermes.pyth.network";
+  const connection = new PriceServiceConnection(stableHermesServiceUrl);
+  const feeds = [priceFeedID];
+
+  try {
+    const currentPrice = await connection.getLatestPriceFeeds(feeds);
+
+    if (currentPrice === undefined) {
+      throw new Error("Price data not available for the given token.");
+    }
+
+    if (currentPrice.length === 0) {
+      throw new Error("Price data not available for the given token.");
+    }
+
+    // get price and exponent from price feed
+    let price = new BN(currentPrice[0].getPriceUnchecked().price);
+    let exponent = new BN(currentPrice[0].getPriceUnchecked().expo);
+
+    // convert to scaled price
+    let scaledPrice = price.div(new BN(10).pow(exponent));
+
+    return scaledPrice.toString();
+  } catch (error: any) {
+    throw new Error(`Fetching price from Pyth failed: ${error.message}`);
+  }
+}