add merlinSwap adapter

dexs/merlinswap/index.ts

@@ -0,0 +1,73 @@
+import fetchURL from "../../utils/fetchURL"
+import { Chain } from "@defillama/sdk/build/general";
+import { FetchOptions, FetchResultVolume, SimpleAdapter } from "../../adapters/types";
+import customBackfill from "../../helpers/customBackfill";
+import { CHAIN } from "../../helpers/chains";
+import { getUniqStartOfTodayTimestamp } from "../../helpers/getUniSubgraphVolume";
+
+
+const historicalVolumeEndpoint = (chain_id: number, page: number) => `https://api-dass.izumi.finance/api/v1/izi_swap/summary_record/?chain_id=${chain_id}&type=4&page_size=100000&page=${page}`
+
+interface IVolumeall {
+  volDay: number;
+  chainId: number;
+  timestamp: number;
+}
+type TChains = {
+  [k: Chain | string]: number;
+};
+type TAdapter = {
+  [key:string]: any;
+};
+
+const chains: TChains =  {
+  [CHAIN.MERLIN]: 4200,
+};
+
+const fetch = async (options: FetchOptions): Promise<FetchResultVolume> => {
+  const dayTimestamp = getUniqStartOfTodayTimestamp(new Date(options.endTimestamp * 1000))
+  let isSuccess = true;
+    let page = 1;
+    const historical: IVolumeall[] = [];
+    while (isSuccess) {
+      const response = (await fetchURL(historicalVolumeEndpoint(chains[options.chain], page)));
+      if (response.is_success){
+        Array.prototype.push.apply(historical, response.data);
+        page += 1;
+      } else {
+        isSuccess = false;
+      };
+    };
+    const historicalVolume = historical.filter(e => e.chainId === chains[options.chain]);
+    const totalVolume = historicalVolume
+      .filter(volItem => (new Date(volItem.timestamp).getTime()) <= dayTimestamp)
+      .reduce((acc, { volDay }) => acc + Number(volDay), 0)
+
+    const dailyVolume = historicalVolume
+      .find(dayItem => (new Date(dayItem.timestamp).getTime()) === dayTimestamp)?.volDay
+
+    return {
+      totalVolume: `${totalVolume}`,
+      dailyVolume: dailyVolume ? `${dailyVolume}` : undefined,
+      timestamp: dayTimestamp,
+    };
+}
+
+const adapters: TAdapter = {};
+for (const chain in chains) {
+  let startTime = 1706946000;
+  if (chains.hasOwnProperty(chain)) {
+    adapters[chain] = {
+      fetch: fetch,
+      start: startTime,
+      customBackfill: customBackfill(chain, () => fetch)
+    };
+  };
+};
+
+const adapter: SimpleAdapter = {
+  adapter: adapters,
+  version: 2,
+};
+
+export default adapter;

helpers/chains.ts

@@ -146,7 +146,8 @@ export enum CHAIN {
   SVM = "svm",
   ASTRZK = "astrzk",
   LYRA = "lyra",
-  XLAYER = "xlayer"
+  XLAYER = "xlayer",
+  MERLIN = "merlin"
 }
 
 // Don´t use