Back 1314 Add support for sequential transaction preprocessing

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@paraswap/dex-lib",
-  "version": "2.36.2",
+  "version": "2.36.3-sequential-preprocessing.0",
   "main": "build/index.js",
   "types": "build/index.d.ts",
   "repository": "https://github.com/paraswap/paraswap-dex-lib",

src/dex/hashflow/hashflow.ts

@@ -62,6 +62,7 @@ export class Hashflow extends SimpleExchange implements IDex<HashflowData> {
   readonly isStatePollingDex = true;
   readonly hasConstantPriceLargeAmounts = false;
   readonly needWrapNative = false;
+  readonly needsSequentialPreprocessing = true;
   readonly isFeeOnTransferSupported = false;
   private api: HashflowApi;
   private rateFetcher: RateFetcher;
@@ -737,7 +738,7 @@ export class Hashflow extends SimpleExchange implements IDex<HashflowData> {
         );
         await this.setBlacklist(options.txOrigin);
       } else {
-        if(e instanceof TooStrictSlippageCheckError) {
+        if (e instanceof TooStrictSlippageCheckError) {
           this.logger.warn(
             `${this.dexKey}-${this.network}: Market Maker ${mm} failed to build transaction on side ${side} with too strict slippage. Skipping restriction`,
           );

src/dex/idex.ts

@@ -20,6 +20,7 @@ import { IDexHelper } from '../dex-helper/idex-helper';
 
 export interface IDexTxBuilder<ExchangeData, DirectParam = null> {
   needWrapNative: boolean;
+  needsSequentialPreprocessing?: boolean;
 
   // Returns the ETH fee required to swap
   // It is optional for a DEX to implement this

src/dex/index.ts

@@ -315,4 +315,10 @@ export class DexAdapterService {
       ? this.sellAdapters[specialDexKey]
       : this.buyAdapters[specialDexKey];
   }
+
+  doesPreProcessingRequireSequentiality(dexKey: string): boolean {
+    const dex = this.getDexByKey(dexKey);
+
+    return !!dex.needsSequentialPreprocessing;
+  }
 }