feet: add zkera-finance adapter (#2064)

* feet: add zkera-finance adapter

* upd: add liquidation to volumes

dexs/zkera-finance/index.ts

@@ -0,0 +1,14 @@
+import { SimpleAdapter } from "../../adapters/types";
+import { CHAIN } from "../../helpers/chains";
+import { fetchVolume } from "./zkera";
+
+const adapter: SimpleAdapter = {
+  version: 2,
+  adapter: {
+    [CHAIN.TELOS]: {
+      fetch: fetchVolume,
+      start: 1627690586,
+    },
+  },
+};
+export default adapter;

dexs/zkera-finance/zkera.ts

@@ -0,0 +1,46 @@
+import { request, gql } from "graphql-request";
+import { FetchOptions } from "../../adapters/types";
+import BigNumber from "bignumber.js";
+
+const graphUrl =
+  "https://api.goldsky.com/api/public/project_clzelu5d634f501x8ai8111wj/subgraphs/zlp-pool/latest/gn";
+const getData = async (timestamp: number) => {
+  const query = gql`
+    {
+      volumeStats(first: 1, where: { period: daily, timestamp: ${timestamp} }) {
+        id
+        burn
+        margin
+        liquidation
+        mint
+        period
+        timestamp
+      }
+    }
+  `;
+  const response = await request(graphUrl, query);
+  let dailyVolume = new BigNumber(0);
+  if (response.volumeStats) {
+    const data = response.volumeStats[0];
+    dailyVolume = dailyVolume
+      .plus(new BigNumber(data.mint))
+      .plus(new BigNumber(data.liquidation))
+      .plus(new BigNumber(data.burn))
+      .plus(new BigNumber(data.margin))
+      .dividedBy(new BigNumber(1e30));
+  }
+  const _dailyVolume = dailyVolume.toString();
+
+  return {
+    dailyVolume: _dailyVolume,
+    timestamp: timestamp,
+  };
+};
+
+export const fetchVolume = async (options: FetchOptions) => {
+  const data = await getData(options.startOfDay);
+  return {
+    dailyVolume: data.dailyVolume,
+    timestamp: data.timestamp,
+  };
+};