add idlWithSlot market filter

src/index.ts

@@ -24,6 +24,7 @@ import {
   PerpMarkets,
   DLOBSubscriber,
   MarketType,
+  isVariant,
 } from "@drift-labs/sdk";
 
 import { Mutex } from "async-mutex";
@@ -549,11 +550,30 @@ const main = async () => {
     }
   });
 
-  app.get(
-    "/orders/idlWithSlot",
-    handleResponseTime,
-    async (_req, res, next) => {
+  app.get("/orders/idlWithSlot", handleResponseTime, async (req, res, next) => {
     try {
+      const { marketName, marketIndex, marketType } = req.query;
+      const { normedMarketType, normedMarketIndex, error } = validateDlobQuery(
+        marketType as string,
+        marketIndex as string,
+        marketName as string
+      );
+      const useFilter =
+        marketName !== undefined ||
+        marketIndex !== undefined ||
+        marketType !== undefined;
+
+      if (useFilter) {
+        if (
+          error ||
+          normedMarketType === undefined ||
+          normedMarketIndex === undefined
+        ) {
+          res.status(400).send(error);
+          return;
+        }
+      }
+
       const dlobOrders: DLOBOrders = [];
 
       for (const user of userMap.values()) {
@@ -564,6 +584,15 @@ const main = async () => {
             continue;
           }
 
+          if (useFilter) {
+            if (
+              getVariant(order.marketType) !== getVariant(normedMarketType) ||
+              order.marketIndex !== normedMarketIndex
+            ) {
+              continue;
+            }
+          }
+
           dlobOrders.push({
             user: user.getUserAccountPublicKey(),
             order,
@@ -571,7 +600,6 @@ const main = async () => {
         }
       }
 
-        res.writeHead(200);
       res.end(
         JSON.stringify({
           slot: bulkAccountLoader.mostRecentSlot,
@@ -581,8 +609,7 @@ const main = async () => {
     } catch (err) {
       next(err);
     }
-    }
-  );
+  });
 
   const validateDlobQuery = (
     marketType?: string,