track rocket perp oi (#6285)

Author: bheluga

open-interest/rocket-oi.ts

@@ -0,0 +1,33 @@
+import { FetchOptions, SimpleAdapter } from "../adapters/types";
+import fetchURL from "../utils/fetchURL";
+import { CHAIN } from "../helpers/chains";
+
+const ROCKET_API_URL = 'https://beta.rocket-cluster-1.com';
+
+async function fetch(_options: FetchOptions) {
+
+    const instrumentsData = await fetchURL(`${ROCKET_API_URL}/instruments`);
+
+    let openInterestAtEnd = 0;
+    const instrumentStats: Record<string, any> = instrumentsData.instrumentStats;
+    for (const instrument of Object.entries(instrumentStats)) {
+        const [id, data] = instrument;
+        const oi = data.openInterest;
+        const price = instrumentsData.instruments[id].lastMatchPrice;
+        openInterestAtEnd += oi * price;
+    }
+
+    return {
+        openInterestAtEnd,
+    };
+
+}
+
+const adapter: SimpleAdapter = {
+    version: 2,
+    runAtCurrTime: true,
+    fetch,
+    chains: [CHAIN.OFF_CHAIN],
+}
+
+export default adapter;